[PATCH 0/2] Add support for MAX31722/MAX31723 temperature sensors

[PATCH 0/2] Add support for MAX31722/MAX31723 temperature sensors

[Tiberiu Breana]

This patch set adds support for the MAX31722/MAX31723 temperature sensors /
thermostats.
Patch 1 adds basic support and power management.
Patch 2 adds threshold interrupt support.

Tiberiu Breana (2):
  iio: temperature: Add support for MAX31722/MAX31723 temperature
    sensors
  iio: temperature: Add threshold interrupt support for max31722

 drivers/iio/temperature/Kconfig    |  12 +
 drivers/iio/temperature/Makefile   |   1 +
 drivers/iio/temperature/max31722.c | 673 +++++++++++++++++++++++++++++++++++++
 3 files changed, 686 insertions(+)
 create mode 100644 drivers/iio/temperature/max31722.c

-- 
1.9.1

[PATCH 1/2] iio: temperature: Add support for MAX31722/MAX31723 temperature sensors

[Tiberiu Breana]

Add basic support for the Maxim Integrated MAX31722/MAX31723 SPI
temperature sensors / thermostats.

Includes:
	- ACPI support;
	- raw temperature readings;
	- ability to set measurement resolution;
	- power management

Datasheet:
https://datasheets.maximintegrated.com/en/ds/MAX31722-MAX31723.pdf

Signed-off-by: Tiberiu Breana <tiberiu.a.breana@intel.com>
---
 drivers/iio/temperature/Kconfig    |  12 ++
 drivers/iio/temperature/Makefile   |   1 +
 drivers/iio/temperature/max31722.c | 374 +++++++++++++++++++++++++++++++++++++
 3 files changed, 387 insertions(+)
 create mode 100644 drivers/iio/temperature/max31722.c

diff --git a/drivers/iio/temperature/Kconfig b/drivers/iio/temperature/Kconfig
index c4664e5..7587887 100644
--- a/drivers/iio/temperature/Kconfig
+++ b/drivers/iio/temperature/Kconfig
@@ -3,6 +3,18 @@
 #
 menu "Temperature sensors"
 
+config MAX31722
+	tristate "MAX31722 temperature sensor"
+	depends on SPI
+	select REGMAP_SPI
+	help
+	  If you say yes here you get support for the Maxim Integrated
+	  MAX31722/MAX31723 digital thermometers / thermostats operating
+	  over an SPI interface.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called max31722.
+
 config MLX90614
 	tristate "MLX90614 contact-less infrared sensor"
 	depends on I2C
diff --git a/drivers/iio/temperature/Makefile b/drivers/iio/temperature/Makefile
index 02bc79d..a9484d6 100644
--- a/drivers/iio/temperature/Makefile
+++ b/drivers/iio/temperature/Makefile
@@ -2,6 +2,7 @@
 # Makefile for industrial I/O temperature drivers
 #
 
+obj-$(CONFIG_MAX31722) += max31722.o
 obj-$(CONFIG_MLX90614) += mlx90614.o
 obj-$(CONFIG_TMP006) += tmp006.o
 obj-$(CONFIG_TSYS01) += tsys01.o
diff --git a/drivers/iio/temperature/max31722.c b/drivers/iio/temperature/max31722.c
new file mode 100644
index 0000000..fa833b6
--- /dev/null
+++ b/drivers/iio/temperature/max31722.c
@@ -0,0 +1,374 @@
+/**
+ * MAX31722/MAX31723 digital thermometer and thermostat SPI driver
+ *
+ * Copyright (c) 2016, Intel Corporation.
+ *
+ * This file is subject to the terms and conditions of version 2 of
+ * the GNU General Public License. See the file COPYING in the main
+ * directory of this archive for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#define MAX31722_REG_CFG				0x00
+#define MAX31722_REG_TEMP_LSB			0x01
+#define MAX31722_REG_TEMP_MSB			0x02
+#define MAX31722_MAX_REG				0x86
+
+#define MAX31722_MODE_CONTINUOUS		0x00
+#define MAX31722_MODE_STANDBY			0x01
+
+#define MAX31722_REGMAP_NAME			"max31722_regmap"
+
+#define MAX31722_SCALE_AVAILABLE		"0.5 0.25 0.125 0.0625"
+
+#define MAX31722_REGFIELD(name)						 \
+	do {								 \
+		data->reg_##name =					 \
+			devm_regmap_field_alloc(&spi->dev, regmap,	 \
+				max31722_reg_field_##name);		 \
+		if (IS_ERR(data->reg_##name)) {				 \
+			dev_err(&spi->dev, "reg field alloc failed.\n"); \
+			return PTR_ERR(data->reg_##name);		 \
+		}							 \
+	} while (0)
+
+static const struct reg_field max31722_reg_field_state =
+				REG_FIELD(MAX31722_REG_CFG, 0, 0);
+static const struct reg_field max31722_reg_field_resolution =
+				REG_FIELD(MAX31722_REG_CFG, 1, 2);
+
+struct max31722_data {
+	struct spi_device *spi_device;
+	struct mutex lock;
+	struct regmap *regmap;
+	struct regmap_field *reg_state;
+	struct regmap_field *reg_resolution;
+};
+
+/*
+ * This table can double as a negative exponent value lookup table
+ * (as micro units) for calculating LSB temperature values.
+ */
+static const int max31722_scale_table[4] = {
+	500000, 250000, 125000, 62500
+};
+
+static IIO_CONST_ATTR(in_temp_scale_available, MAX31722_SCALE_AVAILABLE);
+
+static struct attribute *max31722_attributes[] = {
+	&iio_const_attr_in_temp_scale_available.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group max31722_attribute_group = {
+	.attrs = max31722_attributes
+};
+
+static const struct iio_chan_spec max31722_channels[] = {
+	{
+		.type = IIO_TEMP,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE),
+	},
+};
+
+static bool max31722_is_volatile_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case MAX31722_REG_TEMP_LSB:
+	case MAX31722_REG_TEMP_MSB:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static bool max31722_is_writeable_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case MAX31722_REG_TEMP_LSB:
+	case MAX31722_REG_TEMP_MSB:
+		return false;
+	default:
+		return true;
+	}
+}
+
+static struct regmap_config max31722_regmap_config = {
+	.name = MAX31722_REGMAP_NAME,
+	.reg_bits = 8,
+	.val_bits = 8,
+
+	.max_register = MAX31722_MAX_REG,
+	.cache_type = REGCACHE_RBTREE,
+
+	.volatile_reg = max31722_is_volatile_reg,
+	.writeable_reg = max31722_is_writeable_reg,
+
+	.read_flag_mask = 0x00,
+	.write_flag_mask = 0x80,
+};
+
+/*
+ * Convert a temperature register value to a floating point value.
+ * Data is represented in 9-12 bits, two's complement.
+ * The MSB contains the integer part of the temperature value
+ * (signed), while the LSB contains the fractional part as
+ * negative powers of 2, e.g.: bit 0 is 2^-1, bit 1 is 2^-2, etc.
+ */
+static void max31722_reg_to_float(u16 reg_val, int *val, int *val2)
+{
+	int i;
+	u8 msb;
+	u8 lsb;
+
+	msb = reg_val >> 8;
+	lsb = (reg_val << 8) >> 8;
+
+	/* Calculate the integer part. */
+	if (msb & 0x80) {
+		/* Negative value. Reverse bits and add 1. */
+		u16 orig = reg_val;
+		u16 rev = 0;
+		int num_bits = sizeof(rev) * 8;
+
+		for (i = 0 ; i < num_bits ; i++) {
+			rev |= !(orig & 0x01) << i;
+			orig >>= 1;
+		}
+		rev += 1;
+		msb = rev >> 8;
+		lsb = (rev << 8) >> 8;
+		*val = (-1) * msb;
+	} else { /* Positive value. */
+		*val = msb;
+	}
+
+	/*
+	 * Calculate the fractional part.
+	 * Only the first four LSB bits contain data.
+	 */
+	lsb >>= 4;
+	i = 0;
+	*val2 = 0;
+	while (i < 4) {
+		if ((lsb >> (4 - i - 1)) & 0x01)
+			*val2 += max31722_scale_table[i];
+		lsb <<= 1;
+		lsb >>= 1;
+		i++;
+	}
+}
+
+static int max31722_read_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan,
+			     int *val, int *val2, long mask)
+{
+	int ret;
+	int index;
+	u16 buf;
+	struct max31722_data *data = iio_priv(indio_dev);
+	struct spi_device *spi = data->spi_device;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		mutex_lock(&data->lock);
+		ret = regmap_bulk_read(data->regmap,
+				       MAX31722_REG_TEMP_LSB, &buf, 2);
+		if (ret < 0) {
+			dev_err(&spi->dev, "failed to read temperature register\n");
+			mutex_unlock(&data->lock);
+			return ret;
+		}
+		max31722_reg_to_float(buf, val, val2);
+		mutex_unlock(&data->lock);
+		return IIO_VAL_INT_PLUS_MICRO;
+	case IIO_CHAN_INFO_SCALE:
+		mutex_lock(&data->lock);
+		ret = regmap_field_read(data->reg_resolution, &index);
+		if (ret < 0) {
+			dev_err(&spi->dev, "failed to read configuration register\n");
+			mutex_unlock(&data->lock);
+			return ret;
+		}
+		mutex_unlock(&data->lock);
+		*val = 0;
+		*val2 = max31722_scale_table[index];
+		return IIO_VAL_INT_PLUS_MICRO;
+	}
+
+	return -EINVAL;
+}
+
+static int max31722_write_raw(struct iio_dev *indio_dev,
+			      struct iio_chan_spec const *chan,
+			      int val, int val2, long mask)
+{
+	int i;
+	int ret;
+	int index = -1;
+	struct max31722_data *data = iio_priv(indio_dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SCALE:
+		for (i = 0; i < ARRAY_SIZE(max31722_scale_table); i++) {
+			if (val == 0 && val2 == max31722_scale_table[i]) {
+				index = i;
+				break;
+			}
+		}
+		if (index < 0)
+			return -EINVAL;
+
+		mutex_lock(&data->lock);
+		ret = regmap_field_write(data->reg_resolution, index);
+		mutex_unlock(&data->lock);
+
+		return ret;
+	}
+	return -EINVAL;
+}
+
+static const struct iio_info max31722_info = {
+	.driver_module		= THIS_MODULE,
+	.read_raw		= max31722_read_raw,
+	.write_raw		= max31722_write_raw,
+	.attrs			= &max31722_attribute_group,
+};
+
+static int max31722_init(struct max31722_data *data)
+{
+	int ret = 0;
+	struct spi_device *spi = data->spi_device;
+	struct regmap *regmap;
+
+	/* Initialize the regmap */
+	regmap = devm_regmap_init_spi(spi, &max31722_regmap_config);
+	if (IS_ERR(regmap)) {
+		dev_err(&spi->dev, "regmap initialization failed.\n");
+		return PTR_ERR(regmap);
+	}
+	data->regmap = regmap;
+
+	MAX31722_REGFIELD(state);
+	MAX31722_REGFIELD(resolution);
+
+	/* Set SD bit to 0 so we can have continuous measurements. */
+	ret = regmap_field_write(data->reg_state, MAX31722_MODE_CONTINUOUS);
+	if (ret < 0)
+		dev_err(&spi->dev, "failed to configure sensor.\n");
+
+	return ret;
+}
+
+static int max31722_probe(struct spi_device *spi)
+{
+	int ret;
+	struct iio_dev *indio_dev;
+	struct max31722_data *data;
+
+	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*data));
+	if (!indio_dev) {
+		dev_err(&spi->dev, "iio allocation failed!\n");
+		return -ENOMEM;
+	}
+
+	data = iio_priv(indio_dev);
+	data->spi_device = spi;
+	spi_set_drvdata(spi, indio_dev);
+	mutex_init(&data->lock);
+
+	indio_dev->dev.parent = &spi->dev;
+	indio_dev->info = &max31722_info;
+	indio_dev->name = spi_get_device_id(spi)->name;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = max31722_channels;
+	indio_dev->num_channels = ARRAY_SIZE(max31722_channels);
+
+	ret = max31722_init(data);
+	if (ret < 0)
+		return ret;
+
+	ret = iio_device_register(indio_dev);
+	if (ret < 0) {
+		dev_err(&spi->dev, "iio_device_register failed\n");
+		regmap_field_write(data->reg_state, MAX31722_MODE_STANDBY);
+	}
+
+	return ret;
+}
+
+static int max31722_remove(struct spi_device *spi)
+{
+	struct max31722_data *data;
+	struct iio_dev *indio_dev = spi_get_drvdata(spi);
+
+	iio_device_unregister(indio_dev);
+	data = iio_priv(indio_dev);
+
+	return regmap_field_write(data->reg_state, MAX31722_MODE_STANDBY);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int max31722_suspend(struct device *dev)
+{
+	struct max31722_data *data;
+
+	data = iio_priv(spi_get_drvdata(to_spi_device(dev)));
+
+	return regmap_field_write(data->reg_state, MAX31722_MODE_STANDBY);
+}
+
+static int max31722_resume(struct device *dev)
+{
+	struct max31722_data *data;
+
+	data = iio_priv(spi_get_drvdata(to_spi_device(dev)));
+
+	return regmap_field_write(data->reg_state, MAX31722_MODE_CONTINUOUS);
+}
+
+static SIMPLE_DEV_PM_OPS(max31722_pm_ops, max31722_suspend, max31722_resume);
+
+#define MAX31722_PM_OPS (&max31722_pm_ops)
+#else
+#define MAX31722_PM_OPS NULL
+#endif
+
+static const struct spi_device_id max31722_spi_id[] = {
+	{"max31722", 0},
+	{"max31723", 0},
+	{}
+};
+
+static const struct acpi_device_id max31722_acpi_id[] = {
+	{"MAX31722", 0},
+	{"MAX31723", 0},
+	{}
+};
+
+MODULE_DEVICE_TABLE(spi, max31722_spi_id);
+
+static struct spi_driver max31722_driver = {
+	.driver = {
+		.name = "max31722",
+		.pm = MAX31722_PM_OPS,
+		.acpi_match_table = ACPI_PTR(max31722_acpi_id),
+	},
+	.probe =            max31722_probe,
+	.remove =           max31722_remove,
+	.id_table =         max31722_spi_id,
+};
+
+module_spi_driver(max31722_driver);
+
+MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
+MODULE_DESCRIPTION("MAX31722 digital thermometer and thermostat SPI driver");
+MODULE_LICENSE("GPL v2");
-- 
1.9.1

Re: [PATCH 1/2] iio: temperature: Add support for MAX31722/MAX31723 temperature sensors

[Jonathan Cameron]

On 09/03/16 13:30, Tiberiu Breana wrote:
> Add basic support for the Maxim Integrated MAX31722/MAX31723 SPI
> temperature sensors / thermostats.
> 
> Includes:
> 	- ACPI support;
> 	- raw temperature readings;
> 	- ability to set measurement resolution;
> 	- power management
> 
> Datasheet:
> https://datasheets.maximintegrated.com/en/ds/MAX31722-MAX31723.pdf
> 
> Signed-off-by: Tiberiu Breana <tiberiu.a.breana@intel.com>
I thought I'd give this a quick review, putting aside the question of
whether it should be in IIO at all.

A few really trivial suggestions, but otherwise a nice clean driver.

Jonathan
> ---
>  drivers/iio/temperature/Kconfig    |  12 ++
>  drivers/iio/temperature/Makefile   |   1 +
>  drivers/iio/temperature/max31722.c | 374 +++++++++++++++++++++++++++++++++++++
>  3 files changed, 387 insertions(+)
>  create mode 100644 drivers/iio/temperature/max31722.c
> 
> diff --git a/drivers/iio/temperature/Kconfig b/drivers/iio/temperature/Kconfig
> index c4664e5..7587887 100644
> --- a/drivers/iio/temperature/Kconfig
> +++ b/drivers/iio/temperature/Kconfig
> @@ -3,6 +3,18 @@
>  #
>  menu "Temperature sensors"
>  
> +config MAX31722
> +	tristate "MAX31722 temperature sensor"
> +	depends on SPI
> +	select REGMAP_SPI
> +	help
> +	  If you say yes here you get support for the Maxim Integrated
> +	  MAX31722/MAX31723 digital thermometers / thermostats operating
> +	  over an SPI interface.
> +
> +	  This driver can also be built as a module. If so, the module will
> +	  be called max31722.
> +
>  config MLX90614
>  	tristate "MLX90614 contact-less infrared sensor"
>  	depends on I2C
> diff --git a/drivers/iio/temperature/Makefile b/drivers/iio/temperature/Makefile
> index 02bc79d..a9484d6 100644
> --- a/drivers/iio/temperature/Makefile
> +++ b/drivers/iio/temperature/Makefile
> @@ -2,6 +2,7 @@
>  # Makefile for industrial I/O temperature drivers
>  #
>  
> +obj-$(CONFIG_MAX31722) += max31722.o
>  obj-$(CONFIG_MLX90614) += mlx90614.o
>  obj-$(CONFIG_TMP006) += tmp006.o
>  obj-$(CONFIG_TSYS01) += tsys01.o
> diff --git a/drivers/iio/temperature/max31722.c b/drivers/iio/temperature/max31722.c
> new file mode 100644
> index 0000000..fa833b6
> --- /dev/null
> +++ b/drivers/iio/temperature/max31722.c
> @@ -0,0 +1,374 @@
> +/**
> + * MAX31722/MAX31723 digital thermometer and thermostat SPI driver
> + *
> + * Copyright (c) 2016, Intel Corporation.
> + *
> + * This file is subject to the terms and conditions of version 2 of
> + * the GNU General Public License. See the file COPYING in the main
> + * directory of this archive for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/acpi.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +#include <linux/spi/spi.h>
> +#include <linux/iio/iio.h>
> +#include <linux/iio/sysfs.h>
> +
> +#define MAX31722_REG_CFG				0x00
> +#define MAX31722_REG_TEMP_LSB			0x01
> +#define MAX31722_REG_TEMP_MSB			0x02
> +#define MAX31722_MAX_REG				0x86
> +
> +#define MAX31722_MODE_CONTINUOUS		0x00
> +#define MAX31722_MODE_STANDBY			0x01
> +
> +#define MAX31722_REGMAP_NAME			"max31722_regmap"
> +
> +#define MAX31722_SCALE_AVAILABLE		"0.5 0.25 0.125 0.0625"
> +
> +#define MAX31722_REGFIELD(name)						 \
> +	do {								 \
> +		data->reg_##name =					 \
> +			devm_regmap_field_alloc(&spi->dev, regmap,	 \
> +				max31722_reg_field_##name);		 \
> +		if (IS_ERR(data->reg_##name)) {				 \
> +			dev_err(&spi->dev, "reg field alloc failed.\n"); \
> +			return PTR_ERR(data->reg_##name);		 \
> +		}							 \
> +	} while (0)
> +
> +static const struct reg_field max31722_reg_field_state =
> +				REG_FIELD(MAX31722_REG_CFG, 0, 0);
> +static const struct reg_field max31722_reg_field_resolution =
> +				REG_FIELD(MAX31722_REG_CFG, 1, 2);
> +
> +struct max31722_data {
> +	struct spi_device *spi_device;
> +	struct mutex lock;
> +	struct regmap *regmap;
> +	struct regmap_field *reg_state;
> +	struct regmap_field *reg_resolution;
> +};
> +
> +/*
> + * This table can double as a negative exponent value lookup table
> + * (as micro units) for calculating LSB temperature values.
> + */
> +static const int max31722_scale_table[4] = {
> +	500000, 250000, 125000, 62500
> +};
> +
> +static IIO_CONST_ATTR(in_temp_scale_available, MAX31722_SCALE_AVAILABLE);
> +
> +static struct attribute *max31722_attributes[] = {
> +	&iio_const_attr_in_temp_scale_available.dev_attr.attr,
> +	NULL
> +};
> +
> +static const struct attribute_group max31722_attribute_group = {
> +	.attrs = max31722_attributes
> +};
> +
> +static const struct iio_chan_spec max31722_channels[] = {
> +	{
> +		.type = IIO_TEMP,
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> +				      BIT(IIO_CHAN_INFO_SCALE),
> +	},
> +};
> +
> +static bool max31722_is_volatile_reg(struct device *dev, unsigned int reg)
> +{
> +	switch (reg) {
> +	case MAX31722_REG_TEMP_LSB:
> +	case MAX31722_REG_TEMP_MSB:
> +		return true;
> +	default:
> +		return false;
> +	}
> +}
> +
> +static bool max31722_is_writeable_reg(struct device *dev, unsigned int reg)
> +{
> +	switch (reg) {
> +	case MAX31722_REG_TEMP_LSB:
> +	case MAX31722_REG_TEMP_MSB:
> +		return false;
> +	default:
> +		return true;
> +	}
> +}
> +
> +static struct regmap_config max31722_regmap_config = {
> +	.name = MAX31722_REGMAP_NAME,
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +
> +	.max_register = MAX31722_MAX_REG,
> +	.cache_type = REGCACHE_RBTREE,
> +
> +	.volatile_reg = max31722_is_volatile_reg,
> +	.writeable_reg = max31722_is_writeable_reg,
> +
> +	.read_flag_mask = 0x00,
> +	.write_flag_mask = 0x80,
> +};
> +
> +/*
> + * Convert a temperature register value to a floating point value.
> + * Data is represented in 9-12 bits, two's complement.
> + * The MSB contains the integer part of the temperature value
> + * (signed), while the LSB contains the fractional part as
> + * negative powers of 2, e.g.: bit 0 is 2^-1, bit 1 is 2^-2, etc.
> + */
> +static void max31722_reg_to_float(u16 reg_val, int *val, int *val2)
> +{
> +	int i;
> +	u8 msb;
> +	u8 lsb;
> +
> +	msb = reg_val >> 8;
> +	lsb = (reg_val << 8) >> 8;
> +
> +	/* Calculate the integer part. */
> +	if (msb & 0x80) {
> +		/* Negative value. Reverse bits and add 1. */
> +		u16 orig = reg_val;
> +		u16 rev = 0;
> +		int num_bits = sizeof(rev) * 8;
> +
> +		for (i = 0 ; i < num_bits ; i++) {
> +			rev |= !(orig & 0x01) << i;
> +			orig >>= 1;
> +		}
> +		rev += 1;
> +		msb = rev >> 8;
> +		lsb = (rev << 8) >> 8;
> +		*val = (-1) * msb;
> +	} else { /* Positive value. */
> +		*val = msb;
> +	}
> +
> +	/*
> +	 * Calculate the fractional part.
> +	 * Only the first four LSB bits contain data.
> +	 */
> +	lsb >>= 4;
> +	i = 0;
> +	*val2 = 0;
> +	while (i < 4) {
> +		if ((lsb >> (4 - i - 1)) & 0x01)
> +			*val2 += max31722_scale_table[i];
> +		lsb <<= 1;
> +		lsb >>= 1;
> +		i++;
> +	}
> +}
> +
> +static int max31722_read_raw(struct iio_dev *indio_dev,
> +			     struct iio_chan_spec const *chan,
> +			     int *val, int *val2, long mask)
> +{
> +	int ret;
> +	int index;
> +	u16 buf;
> +	struct max31722_data *data = iio_priv(indio_dev);
> +	struct spi_device *spi = data->spi_device;
> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_RAW:
> +		mutex_lock(&data->lock);
> +		ret = regmap_bulk_read(data->regmap,
> +				       MAX31722_REG_TEMP_LSB, &buf, 2);
> +		if (ret < 0) {
> +			dev_err(&spi->dev, "failed to read temperature register\n");
> +			mutex_unlock(&data->lock);
> +			return ret;
> +		}
> +		max31722_reg_to_float(buf, val, val2);
> +		mutex_unlock(&data->lock);
> +		return IIO_VAL_INT_PLUS_MICRO;
> +	case IIO_CHAN_INFO_SCALE:
> +		mutex_lock(&data->lock);
> +		ret = regmap_field_read(data->reg_resolution, &index);
> +		if (ret < 0) {
> +			dev_err(&spi->dev, "failed to read configuration register\n");
> +			mutex_unlock(&data->lock);
> +			return ret;
> +		}
> +		mutex_unlock(&data->lock);
> +		*val = 0;
> +		*val2 = max31722_scale_table[index];
> +		return IIO_VAL_INT_PLUS_MICRO;
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +static int max31722_write_raw(struct iio_dev *indio_dev,
> +			      struct iio_chan_spec const *chan,
> +			      int val, int val2, long mask)
> +{
> +	int i;
> +	int ret;
> +	int index = -1;
> +	struct max31722_data *data = iio_priv(indio_dev);
> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_SCALE:
> +		for (i = 0; i < ARRAY_SIZE(max31722_scale_table); i++) {
> +			if (val == 0 && val2 == max31722_scale_table[i]) {
> +				index = i;
> +				break;
> +			}
> +		}
> +		if (index < 0)
> +			return -EINVAL;
> +
> +		mutex_lock(&data->lock);
> +		ret = regmap_field_write(data->reg_resolution, index);
> +		mutex_unlock(&data->lock);
> +
> +		return ret;
> +	}
> +	return -EINVAL;
> +}
> +
> +static const struct iio_info max31722_info = {
> +	.driver_module		= THIS_MODULE,
> +	.read_raw		= max31722_read_raw,
> +	.write_raw		= max31722_write_raw,
> +	.attrs			= &max31722_attribute_group,
> +};
> +
> +static int max31722_init(struct max31722_data *data)
> +{
> +	int ret = 0;
> +	struct spi_device *spi = data->spi_device;
> +	struct regmap *regmap;
> +
> +	/* Initialize the regmap */
> +	regmap = devm_regmap_init_spi(spi, &max31722_regmap_config);
> +	if (IS_ERR(regmap)) {
> +		dev_err(&spi->dev, "regmap initialization failed.\n");
> +		return PTR_ERR(regmap);
> +	}
> +	data->regmap = regmap;
> +
> +	MAX31722_REGFIELD(state);
> +	MAX31722_REGFIELD(resolution);
> +
> +	/* Set SD bit to 0 so we can have continuous measurements. */
> +	ret = regmap_field_write(data->reg_state, MAX31722_MODE_CONTINUOUS);
> +	if (ret < 0)
> +		dev_err(&spi->dev, "failed to configure sensor.\n");
> +
> +	return ret;
> +}
> +
> +static int max31722_probe(struct spi_device *spi)
> +{
> +	int ret;
> +	struct iio_dev *indio_dev;
> +	struct max31722_data *data;
> +
> +	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*data));
> +	if (!indio_dev) {
> +		dev_err(&spi->dev, "iio allocation failed!\n");
> +		return -ENOMEM;
> +	}
> +
> +	data = iio_priv(indio_dev);
> +	data->spi_device = spi;
> +	spi_set_drvdata(spi, indio_dev);
> +	mutex_init(&data->lock);
> +
> +	indio_dev->dev.parent = &spi->dev;
> +	indio_dev->info = &max31722_info;
> +	indio_dev->name = spi_get_device_id(spi)->name;
> +	indio_dev->modes = INDIO_DIRECT_MODE;
> +	indio_dev->channels = max31722_channels;
> +	indio_dev->num_channels = ARRAY_SIZE(max31722_channels);
> +
> +	ret = max31722_init(data);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = iio_device_register(indio_dev);
> +	if (ret < 0) {
> +		dev_err(&spi->dev, "iio_device_register failed\n");
Given this statement is effectively unwinding max31722_init, would have
a max31722_exit function as well with this in.  That makes for
'obviously correct' code which is always good for reviewers!

Alternative would be to pull the mode setting out of the init function
and have it inline in this function making the pairing obvious as well.

> +		regmap_field_write(data->reg_state, MAX31722_MODE_STANDBY);
> +	}
> +
> +	return ret;
> +}
> +
> +static int max31722_remove(struct spi_device *spi)
> +{
> +	struct max31722_data *data;
> +	struct iio_dev *indio_dev = spi_get_drvdata(spi);
> +
> +	iio_device_unregister(indio_dev);
> +	data = iio_priv(indio_dev);

I would have put this inline with the declaration of data above.
It is pretty much the same level of lookup as spi_get_drvdata.

> +
> +	return regmap_field_write(data->reg_state, MAX31722_MODE_STANDBY);
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int max31722_suspend(struct device *dev)
> +{
> +	struct max31722_data *data;
> +
> +	data = iio_priv(spi_get_drvdata(to_spi_device(dev)));
> +
> +	return regmap_field_write(data->reg_state, MAX31722_MODE_STANDBY);
> +}
> +
> +static int max31722_resume(struct device *dev)
> +{
> +	struct max31722_data *data;
> +
> +	data = iio_priv(spi_get_drvdata(to_spi_device(dev)));
> +
> +	return regmap_field_write(data->reg_state, MAX31722_MODE_CONTINUOUS);
> +}
> +
> +static SIMPLE_DEV_PM_OPS(max31722_pm_ops, max31722_suspend, max31722_resume);
> +
> +#define MAX31722_PM_OPS (&max31722_pm_ops)
> +#else
> +#define MAX31722_PM_OPS NULL
> +#endif
> +
> +static const struct spi_device_id max31722_spi_id[] = {
> +	{"max31722", 0},
> +	{"max31723", 0},
> +	{}
> +};
> +
> +static const struct acpi_device_id max31722_acpi_id[] = {
> +	{"MAX31722", 0},
> +	{"MAX31723", 0},
> +	{}
> +};
> +
> +MODULE_DEVICE_TABLE(spi, max31722_spi_id);
> +
> +static struct spi_driver max31722_driver = {
> +	.driver = {
> +		.name = "max31722",
> +		.pm = MAX31722_PM_OPS,
> +		.acpi_match_table = ACPI_PTR(max31722_acpi_id),
> +	},
> +	.probe =            max31722_probe,
> +	.remove =           max31722_remove,
> +	.id_table =         max31722_spi_id,
> +};
> +
> +module_spi_driver(max31722_driver);
> +
> +MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
> +MODULE_DESCRIPTION("MAX31722 digital thermometer and thermostat SPI driver");
> +MODULE_LICENSE("GPL v2");
> 

RE: [PATCH 1/2] iio: temperature: Add support for MAX31722/MAX31723 temperature sensors

[Breana, Tiberiu A]

> -----Original Message-----
> From: Jonathan Cameron [mailto:jic23@kernel.org]
> Sent: Saturday, March 12, 2016 11:57 AM
> To: Breana, Tiberiu A <tiberiu.a.breana@intel.com>; linux-
> iio@vger.kernel.org
> Subject: Re: [PATCH 1/2] iio: temperature: Add support for
> MAX31722/MAX31723 temperature sensors
>=20
> On 09/03/16 13:30, Tiberiu Breana wrote:
> > Add basic support for the Maxim Integrated MAX31722/MAX31723 SPI
> > temperature sensors / thermostats.
> >
> > Includes:
> > 	- ACPI support;
> > 	- raw temperature readings;
> > 	- ability to set measurement resolution;
> > 	- power management
> >
> > Datasheet:
> > https://datasheets.maximintegrated.com/en/ds/MAX31722-
> MAX31723.pdf
> >
> > Signed-off-by: Tiberiu Breana <tiberiu.a.breana@intel.com>
> I thought I'd give this a quick review, putting aside the question of whe=
ther it
> should be in IIO at all.

What are the criteria for a temperature driver to be in IIO vs hwmon? I see=
 there's another temperature sensor in IIO - TSYS01 (http://www.meas-spec.c=
om/product/temperature/TSYS01.aspx) which is used for "Industrial Control, =
Replacement of Thermistors and NTCs, Heating / Cooling Systems, HVAC".

>=20
> A few really trivial suggestions, but otherwise a nice clean driver.
>=20
> Jonathan
> > ---
> >  drivers/iio/temperature/Kconfig    |  12 ++
> >  drivers/iio/temperature/Makefile   |   1 +
> >  drivers/iio/temperature/max31722.c | 374
> > +++++++++++++++++++++++++++++++++++++
> >  3 files changed, 387 insertions(+)
> >  create mode 100644 drivers/iio/temperature/max31722.c
> >
> > diff --git a/drivers/iio/temperature/Kconfig
> > b/drivers/iio/temperature/Kconfig index c4664e5..7587887 100644
> > --- a/drivers/iio/temperature/Kconfig
> > +++ b/drivers/iio/temperature/Kconfig
> > @@ -3,6 +3,18 @@
> >  #
> >  menu "Temperature sensors"
> >
> > +config MAX31722
> > +	tristate "MAX31722 temperature sensor"
> > +	depends on SPI
> > +	select REGMAP_SPI
> > +	help
> > +	  If you say yes here you get support for the Maxim Integrated
> > +	  MAX31722/MAX31723 digital thermometers / thermostats
> operating
> > +	  over an SPI interface.
> > +
> > +	  This driver can also be built as a module. If so, the module will
> > +	  be called max31722.
> > +
> >  config MLX90614
> >  	tristate "MLX90614 contact-less infrared sensor"
> >  	depends on I2C
> > diff --git a/drivers/iio/temperature/Makefile
> > b/drivers/iio/temperature/Makefile
> > index 02bc79d..a9484d6 100644
> > --- a/drivers/iio/temperature/Makefile
> > +++ b/drivers/iio/temperature/Makefile
> > @@ -2,6 +2,7 @@
> >  # Makefile for industrial I/O temperature drivers  #
> >
> > +obj-$(CONFIG_MAX31722) +=3D max31722.o
> >  obj-$(CONFIG_MLX90614) +=3D mlx90614.o
> >  obj-$(CONFIG_TMP006) +=3D tmp006.o
> >  obj-$(CONFIG_TSYS01) +=3D tsys01.o
> > diff --git a/drivers/iio/temperature/max31722.c
> > b/drivers/iio/temperature/max31722.c
> > new file mode 100644
> > index 0000000..fa833b6
> > --- /dev/null
> > +++ b/drivers/iio/temperature/max31722.c
> > @@ -0,0 +1,374 @@
> > +/**
> > + * MAX31722/MAX31723 digital thermometer and thermostat SPI driver
> > + *
> > + * Copyright (c) 2016, Intel Corporation.
> > + *
> > + * This file is subject to the terms and conditions of version 2 of
> > + * the GNU General Public License. See the file COPYING in the main
> > + * directory of this archive for more details.
> > + */
> > +
> > +#include <linux/kernel.h>
> > +#include <linux/acpi.h>
> > +#include <linux/module.h>
> > +#include <linux/regmap.h>
> > +#include <linux/spi/spi.h>
> > +#include <linux/iio/iio.h>
> > +#include <linux/iio/sysfs.h>
> > +
> > +#define MAX31722_REG_CFG				0x00
> > +#define MAX31722_REG_TEMP_LSB			0x01
> > +#define MAX31722_REG_TEMP_MSB			0x02
> > +#define MAX31722_MAX_REG				0x86
> > +
> > +#define MAX31722_MODE_CONTINUOUS		0x00
> > +#define MAX31722_MODE_STANDBY			0x01
> > +
> > +#define MAX31722_REGMAP_NAME
> 	"max31722_regmap"
> > +
> > +#define MAX31722_SCALE_AVAILABLE		"0.5 0.25 0.125
> 0.0625"
> > +
> > +#define MAX31722_REGFIELD(name)
> 		 \
> > +	do {								 \
> > +		data->reg_##name =3D					 \
> > +			devm_regmap_field_alloc(&spi->dev, regmap,	 \
> > +				max31722_reg_field_##name);
> 	 \
> > +		if (IS_ERR(data->reg_##name)) {
> 	 \
> > +			dev_err(&spi->dev, "reg field alloc failed.\n"); \
> > +			return PTR_ERR(data->reg_##name);		 \
> > +		}							 \
> > +	} while (0)
> > +
> > +static const struct reg_field max31722_reg_field_state =3D
> > +				REG_FIELD(MAX31722_REG_CFG, 0, 0); static
> const struct reg_field
> > +max31722_reg_field_resolution =3D
> > +				REG_FIELD(MAX31722_REG_CFG, 1, 2);
> > +
> > +struct max31722_data {
> > +	struct spi_device *spi_device;
> > +	struct mutex lock;
> > +	struct regmap *regmap;
> > +	struct regmap_field *reg_state;
> > +	struct regmap_field *reg_resolution; };
> > +
> > +/*
> > + * This table can double as a negative exponent value lookup table
> > + * (as micro units) for calculating LSB temperature values.
> > + */
> > +static const int max31722_scale_table[4] =3D {
> > +	500000, 250000, 125000, 62500
> > +};
> > +
> > +static IIO_CONST_ATTR(in_temp_scale_available,
> > +MAX31722_SCALE_AVAILABLE);
> > +
> > +static struct attribute *max31722_attributes[] =3D {
> > +	&iio_const_attr_in_temp_scale_available.dev_attr.attr,
> > +	NULL
> > +};
> > +
> > +static const struct attribute_group max31722_attribute_group =3D {
> > +	.attrs =3D max31722_attributes
> > +};
> > +
> > +static const struct iio_chan_spec max31722_channels[] =3D {
> > +	{
> > +		.type =3D IIO_TEMP,
> > +		.info_mask_separate =3D BIT(IIO_CHAN_INFO_RAW) |
> > +				      BIT(IIO_CHAN_INFO_SCALE),
> > +	},
> > +};
> > +
> > +static bool max31722_is_volatile_reg(struct device *dev, unsigned int
> > +reg) {
> > +	switch (reg) {
> > +	case MAX31722_REG_TEMP_LSB:
> > +	case MAX31722_REG_TEMP_MSB:
> > +		return true;
> > +	default:
> > +		return false;
> > +	}
> > +}
> > +
> > +static bool max31722_is_writeable_reg(struct device *dev, unsigned
> > +int reg) {
> > +	switch (reg) {
> > +	case MAX31722_REG_TEMP_LSB:
> > +	case MAX31722_REG_TEMP_MSB:
> > +		return false;
> > +	default:
> > +		return true;
> > +	}
> > +}
> > +
> > +static struct regmap_config max31722_regmap_config =3D {
> > +	.name =3D MAX31722_REGMAP_NAME,
> > +	.reg_bits =3D 8,
> > +	.val_bits =3D 8,
> > +
> > +	.max_register =3D MAX31722_MAX_REG,
> > +	.cache_type =3D REGCACHE_RBTREE,
> > +
> > +	.volatile_reg =3D max31722_is_volatile_reg,
> > +	.writeable_reg =3D max31722_is_writeable_reg,
> > +
> > +	.read_flag_mask =3D 0x00,
> > +	.write_flag_mask =3D 0x80,
> > +};
> > +
> > +/*
> > + * Convert a temperature register value to a floating point value.
> > + * Data is represented in 9-12 bits, two's complement.
> > + * The MSB contains the integer part of the temperature value
> > + * (signed), while the LSB contains the fractional part as
> > + * negative powers of 2, e.g.: bit 0 is 2^-1, bit 1 is 2^-2, etc.
> > + */
> > +static void max31722_reg_to_float(u16 reg_val, int *val, int *val2) {
> > +	int i;
> > +	u8 msb;
> > +	u8 lsb;
> > +
> > +	msb =3D reg_val >> 8;
> > +	lsb =3D (reg_val << 8) >> 8;
> > +
> > +	/* Calculate the integer part. */
> > +	if (msb & 0x80) {
> > +		/* Negative value. Reverse bits and add 1. */
> > +		u16 orig =3D reg_val;
> > +		u16 rev =3D 0;
> > +		int num_bits =3D sizeof(rev) * 8;
> > +
> > +		for (i =3D 0 ; i < num_bits ; i++) {
> > +			rev |=3D !(orig & 0x01) << i;
> > +			orig >>=3D 1;
> > +		}
> > +		rev +=3D 1;
> > +		msb =3D rev >> 8;
> > +		lsb =3D (rev << 8) >> 8;
> > +		*val =3D (-1) * msb;
> > +	} else { /* Positive value. */
> > +		*val =3D msb;
> > +	}
> > +
> > +	/*
> > +	 * Calculate the fractional part.
> > +	 * Only the first four LSB bits contain data.
> > +	 */
> > +	lsb >>=3D 4;
> > +	i =3D 0;
> > +	*val2 =3D 0;
> > +	while (i < 4) {
> > +		if ((lsb >> (4 - i - 1)) & 0x01)
> > +			*val2 +=3D max31722_scale_table[i];
> > +		lsb <<=3D 1;
> > +		lsb >>=3D 1;
> > +		i++;
> > +	}
> > +}
> > +
> > +static int max31722_read_raw(struct iio_dev *indio_dev,
> > +			     struct iio_chan_spec const *chan,
> > +			     int *val, int *val2, long mask) {
> > +	int ret;
> > +	int index;
> > +	u16 buf;
> > +	struct max31722_data *data =3D iio_priv(indio_dev);
> > +	struct spi_device *spi =3D data->spi_device;
> > +
> > +	switch (mask) {
> > +	case IIO_CHAN_INFO_RAW:
> > +		mutex_lock(&data->lock);
> > +		ret =3D regmap_bulk_read(data->regmap,
> > +				       MAX31722_REG_TEMP_LSB, &buf, 2);
> > +		if (ret < 0) {
> > +			dev_err(&spi->dev, "failed to read temperature
> register\n");
> > +			mutex_unlock(&data->lock);
> > +			return ret;
> > +		}
> > +		max31722_reg_to_float(buf, val, val2);
> > +		mutex_unlock(&data->lock);
> > +		return IIO_VAL_INT_PLUS_MICRO;
> > +	case IIO_CHAN_INFO_SCALE:
> > +		mutex_lock(&data->lock);
> > +		ret =3D regmap_field_read(data->reg_resolution, &index);
> > +		if (ret < 0) {
> > +			dev_err(&spi->dev, "failed to read configuration
> register\n");
> > +			mutex_unlock(&data->lock);
> > +			return ret;
> > +		}
> > +		mutex_unlock(&data->lock);
> > +		*val =3D 0;
> > +		*val2 =3D max31722_scale_table[index];
> > +		return IIO_VAL_INT_PLUS_MICRO;
> > +	}
> > +
> > +	return -EINVAL;
> > +}
> > +
> > +static int max31722_write_raw(struct iio_dev *indio_dev,
> > +			      struct iio_chan_spec const *chan,
> > +			      int val, int val2, long mask) {
> > +	int i;
> > +	int ret;
> > +	int index =3D -1;
> > +	struct max31722_data *data =3D iio_priv(indio_dev);
> > +
> > +	switch (mask) {
> > +	case IIO_CHAN_INFO_SCALE:
> > +		for (i =3D 0; i < ARRAY_SIZE(max31722_scale_table); i++) {
> > +			if (val =3D=3D 0 && val2 =3D=3D max31722_scale_table[i]) {
> > +				index =3D i;
> > +				break;
> > +			}
> > +		}
> > +		if (index < 0)
> > +			return -EINVAL;
> > +
> > +		mutex_lock(&data->lock);
> > +		ret =3D regmap_field_write(data->reg_resolution, index);
> > +		mutex_unlock(&data->lock);
> > +
> > +		return ret;
> > +	}
> > +	return -EINVAL;
> > +}
> > +
> > +static const struct iio_info max31722_info =3D {
> > +	.driver_module		=3D THIS_MODULE,
> > +	.read_raw		=3D max31722_read_raw,
> > +	.write_raw		=3D max31722_write_raw,
> > +	.attrs			=3D &max31722_attribute_group,
> > +};
> > +
> > +static int max31722_init(struct max31722_data *data) {
> > +	int ret =3D 0;
> > +	struct spi_device *spi =3D data->spi_device;
> > +	struct regmap *regmap;
> > +
> > +	/* Initialize the regmap */
> > +	regmap =3D devm_regmap_init_spi(spi, &max31722_regmap_config);
> > +	if (IS_ERR(regmap)) {
> > +		dev_err(&spi->dev, "regmap initialization failed.\n");
> > +		return PTR_ERR(regmap);
> > +	}
> > +	data->regmap =3D regmap;
> > +
> > +	MAX31722_REGFIELD(state);
> > +	MAX31722_REGFIELD(resolution);
> > +
> > +	/* Set SD bit to 0 so we can have continuous measurements. */
> > +	ret =3D regmap_field_write(data->reg_state,
> MAX31722_MODE_CONTINUOUS);
> > +	if (ret < 0)
> > +		dev_err(&spi->dev, "failed to configure sensor.\n");
> > +
> > +	return ret;
> > +}
> > +
> > +static int max31722_probe(struct spi_device *spi) {
> > +	int ret;
> > +	struct iio_dev *indio_dev;
> > +	struct max31722_data *data;
> > +
> > +	indio_dev =3D devm_iio_device_alloc(&spi->dev, sizeof(*data));
> > +	if (!indio_dev) {
> > +		dev_err(&spi->dev, "iio allocation failed!\n");
> > +		return -ENOMEM;
> > +	}
> > +
> > +	data =3D iio_priv(indio_dev);
> > +	data->spi_device =3D spi;
> > +	spi_set_drvdata(spi, indio_dev);
> > +	mutex_init(&data->lock);
> > +
> > +	indio_dev->dev.parent =3D &spi->dev;
> > +	indio_dev->info =3D &max31722_info;
> > +	indio_dev->name =3D spi_get_device_id(spi)->name;
> > +	indio_dev->modes =3D INDIO_DIRECT_MODE;
> > +	indio_dev->channels =3D max31722_channels;
> > +	indio_dev->num_channels =3D ARRAY_SIZE(max31722_channels);
> > +
> > +	ret =3D max31722_init(data);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	ret =3D iio_device_register(indio_dev);
> > +	if (ret < 0) {
> > +		dev_err(&spi->dev, "iio_device_register failed\n");
> Given this statement is effectively unwinding max31722_init, would have a
> max31722_exit function as well with this in.  That makes for 'obviously
> correct' code which is always good for reviewers!
>=20
> Alternative would be to pull the mode setting out of the init function an=
d
> have it inline in this function making the pairing obvious as well.
>=20
> > +		regmap_field_write(data->reg_state,
> MAX31722_MODE_STANDBY);
> > +	}
> > +
> > +	return ret;
> > +}
> > +
> > +static int max31722_remove(struct spi_device *spi) {
> > +	struct max31722_data *data;
> > +	struct iio_dev *indio_dev =3D spi_get_drvdata(spi);
> > +
> > +	iio_device_unregister(indio_dev);
> > +	data =3D iio_priv(indio_dev);
>=20
> I would have put this inline with the declaration of data above.
> It is pretty much the same level of lookup as spi_get_drvdata.
>=20
> > +
> > +	return regmap_field_write(data->reg_state,
> MAX31722_MODE_STANDBY); }
> > +
> > +#ifdef CONFIG_PM_SLEEP
> > +static int max31722_suspend(struct device *dev) {
> > +	struct max31722_data *data;
> > +
> > +	data =3D iio_priv(spi_get_drvdata(to_spi_device(dev)));
> > +
> > +	return regmap_field_write(data->reg_state,
> MAX31722_MODE_STANDBY); }
> > +
> > +static int max31722_resume(struct device *dev) {
> > +	struct max31722_data *data;
> > +
> > +	data =3D iio_priv(spi_get_drvdata(to_spi_device(dev)));
> > +
> > +	return regmap_field_write(data->reg_state,
> > +MAX31722_MODE_CONTINUOUS); }
> > +
> > +static SIMPLE_DEV_PM_OPS(max31722_pm_ops, max31722_suspend,
> > +max31722_resume);
> > +
> > +#define MAX31722_PM_OPS (&max31722_pm_ops) #else #define
> > +MAX31722_PM_OPS NULL #endif
> > +
> > +static const struct spi_device_id max31722_spi_id[] =3D {
> > +	{"max31722", 0},
> > +	{"max31723", 0},
> > +	{}
> > +};
> > +
> > +static const struct acpi_device_id max31722_acpi_id[] =3D {
> > +	{"MAX31722", 0},
> > +	{"MAX31723", 0},
> > +	{}
> > +};
> > +
> > +MODULE_DEVICE_TABLE(spi, max31722_spi_id);
> > +
> > +static struct spi_driver max31722_driver =3D {
> > +	.driver =3D {
> > +		.name =3D "max31722",
> > +		.pm =3D MAX31722_PM_OPS,
> > +		.acpi_match_table =3D ACPI_PTR(max31722_acpi_id),
> > +	},
> > +	.probe =3D            max31722_probe,
> > +	.remove =3D           max31722_remove,
> > +	.id_table =3D         max31722_spi_id,
> > +};
> > +
> > +module_spi_driver(max31722_driver);
> > +
> > +MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
> > +MODULE_DESCRIPTION("MAX31722 digital thermometer and thermostat
> SPI
> > +driver"); MODULE_LICENSE("GPL v2");
> >

RE: [PATCH 1/2] iio: temperature: Add support for MAX31722/MAX31723 temperature sensors

[Jonathan Cameron]

On 14 March 2016 13:45:29 GMT+00:00, "Breana, Tiberiu A" <tiberiu.a.breana@intel.com> wrote:
>> -----Original Message-----
>> From: Jonathan Cameron [mailto:jic23@kernel.org]
>> Sent: Saturday, March 12, 2016 11:57 AM
>> To: Breana, Tiberiu A <tiberiu.a.breana@intel.com>; linux-
>> iio@vger.kernel.org
>> Subject: Re: [PATCH 1/2] iio: temperature: Add support for
>> MAX31722/MAX31723 temperature sensors
>> 
>> On 09/03/16 13:30, Tiberiu Breana wrote:
>> > Add basic support for the Maxim Integrated MAX31722/MAX31723 SPI
>> > temperature sensors / thermostats.
>> >
>> > Includes:
>> > 	- ACPI support;
>> > 	- raw temperature readings;
>> > 	- ability to set measurement resolution;
>> > 	- power management
>> >
>> > Datasheet:
>> > https://datasheets.maximintegrated.com/en/ds/MAX31722-
>> MAX31723.pdf
>> >
>> > Signed-off-by: Tiberiu Breana <tiberiu.a.breana@intel.com>
>> I thought I'd give this a quick review, putting aside the question of
>whether it
>> should be in IIO at all.
>
>What are the criteria for a temperature driver to be in IIO vs hwmon? I
>see there's another temperature sensor in IIO - TSYS01
>(http://www.meas-spec.com/product/temperature/TSYS01.aspx) which is
>used for "Industrial Control, Replacement of Thermistors and NTCs,
>Heating / Cooling Systems, HVAC".
There unfortunately isn't a clear divide and we do have the iio-hwmon bridge driver
to paper over the cracks.  The measspec drivers are an oddity as they are actually
interface matching with pressure and humidity devices (probably the same silicon?) Decision there was made
with the hwmon guys was that we were better off not duplicating drivers and
having the temp drivers as IIO drivers despite the irritation of using the bridge
 driver when hwmon type usage was desired.

Rule of thumb (beyond persuading hwmon maintainers) I go by is that there
needs to be a usecase or code related reason that hwmon is unsuitable.

Jonathan
>
>> 
>> A few really trivial suggestions, but otherwise a nice clean driver.
>> 
>> Jonathan
>> > ---
>> >  drivers/iio/temperature/Kconfig    |  12 ++
>> >  drivers/iio/temperature/Makefile   |   1 +
>> >  drivers/iio/temperature/max31722.c | 374
>> > +++++++++++++++++++++++++++++++++++++
>> >  3 files changed, 387 insertions(+)
>> >  create mode 100644 drivers/iio/temperature/max31722.c
>> >
>> > diff --git a/drivers/iio/temperature/Kconfig
>> > b/drivers/iio/temperature/Kconfig index c4664e5..7587887 100644
>> > --- a/drivers/iio/temperature/Kconfig
>> > +++ b/drivers/iio/temperature/Kconfig
>> > @@ -3,6 +3,18 @@
>> >  #
>> >  menu "Temperature sensors"
>> >
>> > +config MAX31722
>> > +	tristate "MAX31722 temperature sensor"
>> > +	depends on SPI
>> > +	select REGMAP_SPI
>> > +	help
>> > +	  If you say yes here you get support for the Maxim Integrated
>> > +	  MAX31722/MAX31723 digital thermometers / thermostats
>> operating
>> > +	  over an SPI interface.
>> > +
>> > +	  This driver can also be built as a module. If so, the module
>will
>> > +	  be called max31722.
>> > +
>> >  config MLX90614
>> >  	tristate "MLX90614 contact-less infrared sensor"
>> >  	depends on I2C
>> > diff --git a/drivers/iio/temperature/Makefile
>> > b/drivers/iio/temperature/Makefile
>> > index 02bc79d..a9484d6 100644
>> > --- a/drivers/iio/temperature/Makefile
>> > +++ b/drivers/iio/temperature/Makefile
>> > @@ -2,6 +2,7 @@
>> >  # Makefile for industrial I/O temperature drivers  #
>> >
>> > +obj-$(CONFIG_MAX31722) += max31722.o
>> >  obj-$(CONFIG_MLX90614) += mlx90614.o
>> >  obj-$(CONFIG_TMP006) += tmp006.o
>> >  obj-$(CONFIG_TSYS01) += tsys01.o
>> > diff --git a/drivers/iio/temperature/max31722.c
>> > b/drivers/iio/temperature/max31722.c
>> > new file mode 100644
>> > index 0000000..fa833b6
>> > --- /dev/null
>> > +++ b/drivers/iio/temperature/max31722.c
>> > @@ -0,0 +1,374 @@
>> > +/**
>> > + * MAX31722/MAX31723 digital thermometer and thermostat SPI driver
>> > + *
>> > + * Copyright (c) 2016, Intel Corporation.
>> > + *
>> > + * This file is subject to the terms and conditions of version 2
>of
>> > + * the GNU General Public License. See the file COPYING in the
>main
>> > + * directory of this archive for more details.
>> > + */
>> > +
>> > +#include <linux/kernel.h>
>> > +#include <linux/acpi.h>
>> > +#include <linux/module.h>
>> > +#include <linux/regmap.h>
>> > +#include <linux/spi/spi.h>
>> > +#include <linux/iio/iio.h>
>> > +#include <linux/iio/sysfs.h>
>> > +
>> > +#define MAX31722_REG_CFG				0x00
>> > +#define MAX31722_REG_TEMP_LSB			0x01
>> > +#define MAX31722_REG_TEMP_MSB			0x02
>> > +#define MAX31722_MAX_REG				0x86
>> > +
>> > +#define MAX31722_MODE_CONTINUOUS		0x00
>> > +#define MAX31722_MODE_STANDBY			0x01
>> > +
>> > +#define MAX31722_REGMAP_NAME
>> 	"max31722_regmap"
>> > +
>> > +#define MAX31722_SCALE_AVAILABLE		"0.5 0.25 0.125
>> 0.0625"
>> > +
>> > +#define MAX31722_REGFIELD(name)
>> 		 \
>> > +	do {								 \
>> > +		data->reg_##name =					 \
>> > +			devm_regmap_field_alloc(&spi->dev, regmap,	 \
>> > +				max31722_reg_field_##name);
>> 	 \
>> > +		if (IS_ERR(data->reg_##name)) {
>> 	 \
>> > +			dev_err(&spi->dev, "reg field alloc failed.\n"); \
>> > +			return PTR_ERR(data->reg_##name);		 \
>> > +		}							 \
>> > +	} while (0)
>> > +
>> > +static const struct reg_field max31722_reg_field_state =
>> > +				REG_FIELD(MAX31722_REG_CFG, 0, 0); static
>> const struct reg_field
>> > +max31722_reg_field_resolution =
>> > +				REG_FIELD(MAX31722_REG_CFG, 1, 2);
>> > +
>> > +struct max31722_data {
>> > +	struct spi_device *spi_device;
>> > +	struct mutex lock;
>> > +	struct regmap *regmap;
>> > +	struct regmap_field *reg_state;
>> > +	struct regmap_field *reg_resolution; };
>> > +
>> > +/*
>> > + * This table can double as a negative exponent value lookup table
>> > + * (as micro units) for calculating LSB temperature values.
>> > + */
>> > +static const int max31722_scale_table[4] = {
>> > +	500000, 250000, 125000, 62500
>> > +};
>> > +
>> > +static IIO_CONST_ATTR(in_temp_scale_available,
>> > +MAX31722_SCALE_AVAILABLE);
>> > +
>> > +static struct attribute *max31722_attributes[] = {
>> > +	&iio_const_attr_in_temp_scale_available.dev_attr.attr,
>> > +	NULL
>> > +};
>> > +
>> > +static const struct attribute_group max31722_attribute_group = {
>> > +	.attrs = max31722_attributes
>> > +};
>> > +
>> > +static const struct iio_chan_spec max31722_channels[] = {
>> > +	{
>> > +		.type = IIO_TEMP,
>> > +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
>> > +				      BIT(IIO_CHAN_INFO_SCALE),
>> > +	},
>> > +};
>> > +
>> > +static bool max31722_is_volatile_reg(struct device *dev, unsigned
>int
>> > +reg) {
>> > +	switch (reg) {
>> > +	case MAX31722_REG_TEMP_LSB:
>> > +	case MAX31722_REG_TEMP_MSB:
>> > +		return true;
>> > +	default:
>> > +		return false;
>> > +	}
>> > +}
>> > +
>> > +static bool max31722_is_writeable_reg(struct device *dev, unsigned
>> > +int reg) {
>> > +	switch (reg) {
>> > +	case MAX31722_REG_TEMP_LSB:
>> > +	case MAX31722_REG_TEMP_MSB:
>> > +		return false;
>> > +	default:
>> > +		return true;
>> > +	}
>> > +}
>> > +
>> > +static struct regmap_config max31722_regmap_config = {
>> > +	.name = MAX31722_REGMAP_NAME,
>> > +	.reg_bits = 8,
>> > +	.val_bits = 8,
>> > +
>> > +	.max_register = MAX31722_MAX_REG,
>> > +	.cache_type = REGCACHE_RBTREE,
>> > +
>> > +	.volatile_reg = max31722_is_volatile_reg,
>> > +	.writeable_reg = max31722_is_writeable_reg,
>> > +
>> > +	.read_flag_mask = 0x00,
>> > +	.write_flag_mask = 0x80,
>> > +};
>> > +
>> > +/*
>> > + * Convert a temperature register value to a floating point value.
>> > + * Data is represented in 9-12 bits, two's complement.
>> > + * The MSB contains the integer part of the temperature value
>> > + * (signed), while the LSB contains the fractional part as
>> > + * negative powers of 2, e.g.: bit 0 is 2^-1, bit 1 is 2^-2, etc.
>> > + */
>> > +static void max31722_reg_to_float(u16 reg_val, int *val, int
>*val2) {
>> > +	int i;
>> > +	u8 msb;
>> > +	u8 lsb;
>> > +
>> > +	msb = reg_val >> 8;
>> > +	lsb = (reg_val << 8) >> 8;
>> > +
>> > +	/* Calculate the integer part. */
>> > +	if (msb & 0x80) {
>> > +		/* Negative value. Reverse bits and add 1. */
>> > +		u16 orig = reg_val;
>> > +		u16 rev = 0;
>> > +		int num_bits = sizeof(rev) * 8;
>> > +
>> > +		for (i = 0 ; i < num_bits ; i++) {
>> > +			rev |= !(orig & 0x01) << i;
>> > +			orig >>= 1;
>> > +		}
>> > +		rev += 1;
>> > +		msb = rev >> 8;
>> > +		lsb = (rev << 8) >> 8;
>> > +		*val = (-1) * msb;
>> > +	} else { /* Positive value. */
>> > +		*val = msb;
>> > +	}
>> > +
>> > +	/*
>> > +	 * Calculate the fractional part.
>> > +	 * Only the first four LSB bits contain data.
>> > +	 */
>> > +	lsb >>= 4;
>> > +	i = 0;
>> > +	*val2 = 0;
>> > +	while (i < 4) {
>> > +		if ((lsb >> (4 - i - 1)) & 0x01)
>> > +			*val2 += max31722_scale_table[i];
>> > +		lsb <<= 1;
>> > +		lsb >>= 1;
>> > +		i++;
>> > +	}
>> > +}
>> > +
>> > +static int max31722_read_raw(struct iio_dev *indio_dev,
>> > +			     struct iio_chan_spec const *chan,
>> > +			     int *val, int *val2, long mask) {
>> > +	int ret;
>> > +	int index;
>> > +	u16 buf;
>> > +	struct max31722_data *data = iio_priv(indio_dev);
>> > +	struct spi_device *spi = data->spi_device;
>> > +
>> > +	switch (mask) {
>> > +	case IIO_CHAN_INFO_RAW:
>> > +		mutex_lock(&data->lock);
>> > +		ret = regmap_bulk_read(data->regmap,
>> > +				       MAX31722_REG_TEMP_LSB, &buf, 2);
>> > +		if (ret < 0) {
>> > +			dev_err(&spi->dev, "failed to read temperature
>> register\n");
>> > +			mutex_unlock(&data->lock);
>> > +			return ret;
>> > +		}
>> > +		max31722_reg_to_float(buf, val, val2);
>> > +		mutex_unlock(&data->lock);
>> > +		return IIO_VAL_INT_PLUS_MICRO;
>> > +	case IIO_CHAN_INFO_SCALE:
>> > +		mutex_lock(&data->lock);
>> > +		ret = regmap_field_read(data->reg_resolution, &index);
>> > +		if (ret < 0) {
>> > +			dev_err(&spi->dev, "failed to read configuration
>> register\n");
>> > +			mutex_unlock(&data->lock);
>> > +			return ret;
>> > +		}
>> > +		mutex_unlock(&data->lock);
>> > +		*val = 0;
>> > +		*val2 = max31722_scale_table[index];
>> > +		return IIO_VAL_INT_PLUS_MICRO;
>> > +	}
>> > +
>> > +	return -EINVAL;
>> > +}
>> > +
>> > +static int max31722_write_raw(struct iio_dev *indio_dev,
>> > +			      struct iio_chan_spec const *chan,
>> > +			      int val, int val2, long mask) {
>> > +	int i;
>> > +	int ret;
>> > +	int index = -1;
>> > +	struct max31722_data *data = iio_priv(indio_dev);
>> > +
>> > +	switch (mask) {
>> > +	case IIO_CHAN_INFO_SCALE:
>> > +		for (i = 0; i < ARRAY_SIZE(max31722_scale_table); i++) {
>> > +			if (val == 0 && val2 == max31722_scale_table[i]) {
>> > +				index = i;
>> > +				break;
>> > +			}
>> > +		}
>> > +		if (index < 0)
>> > +			return -EINVAL;
>> > +
>> > +		mutex_lock(&data->lock);
>> > +		ret = regmap_field_write(data->reg_resolution, index);
>> > +		mutex_unlock(&data->lock);
>> > +
>> > +		return ret;
>> > +	}
>> > +	return -EINVAL;
>> > +}
>> > +
>> > +static const struct iio_info max31722_info = {
>> > +	.driver_module		= THIS_MODULE,
>> > +	.read_raw		= max31722_read_raw,
>> > +	.write_raw		= max31722_write_raw,
>> > +	.attrs			= &max31722_attribute_group,
>> > +};
>> > +
>> > +static int max31722_init(struct max31722_data *data) {
>> > +	int ret = 0;
>> > +	struct spi_device *spi = data->spi_device;
>> > +	struct regmap *regmap;
>> > +
>> > +	/* Initialize the regmap */
>> > +	regmap = devm_regmap_init_spi(spi, &max31722_regmap_config);
>> > +	if (IS_ERR(regmap)) {
>> > +		dev_err(&spi->dev, "regmap initialization failed.\n");
>> > +		return PTR_ERR(regmap);
>> > +	}
>> > +	data->regmap = regmap;
>> > +
>> > +	MAX31722_REGFIELD(state);
>> > +	MAX31722_REGFIELD(resolution);
>> > +
>> > +	/* Set SD bit to 0 so we can have continuous measurements. */
>> > +	ret = regmap_field_write(data->reg_state,
>> MAX31722_MODE_CONTINUOUS);
>> > +	if (ret < 0)
>> > +		dev_err(&spi->dev, "failed to configure sensor.\n");
>> > +
>> > +	return ret;
>> > +}
>> > +
>> > +static int max31722_probe(struct spi_device *spi) {
>> > +	int ret;
>> > +	struct iio_dev *indio_dev;
>> > +	struct max31722_data *data;
>> > +
>> > +	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*data));
>> > +	if (!indio_dev) {
>> > +		dev_err(&spi->dev, "iio allocation failed!\n");
>> > +		return -ENOMEM;
>> > +	}
>> > +
>> > +	data = iio_priv(indio_dev);
>> > +	data->spi_device = spi;
>> > +	spi_set_drvdata(spi, indio_dev);
>> > +	mutex_init(&data->lock);
>> > +
>> > +	indio_dev->dev.parent = &spi->dev;
>> > +	indio_dev->info = &max31722_info;
>> > +	indio_dev->name = spi_get_device_id(spi)->name;
>> > +	indio_dev->modes = INDIO_DIRECT_MODE;
>> > +	indio_dev->channels = max31722_channels;
>> > +	indio_dev->num_channels = ARRAY_SIZE(max31722_channels);
>> > +
>> > +	ret = max31722_init(data);
>> > +	if (ret < 0)
>> > +		return ret;
>> > +
>> > +	ret = iio_device_register(indio_dev);
>> > +	if (ret < 0) {
>> > +		dev_err(&spi->dev, "iio_device_register failed\n");
>> Given this statement is effectively unwinding max31722_init, would
>have a
>> max31722_exit function as well with this in.  That makes for
>'obviously
>> correct' code which is always good for reviewers!
>> 
>> Alternative would be to pull the mode setting out of the init
>function and
>> have it inline in this function making the pairing obvious as well.
>> 
>> > +		regmap_field_write(data->reg_state,
>> MAX31722_MODE_STANDBY);
>> > +	}
>> > +
>> > +	return ret;
>> > +}
>> > +
>> > +static int max31722_remove(struct spi_device *spi) {
>> > +	struct max31722_data *data;
>> > +	struct iio_dev *indio_dev = spi_get_drvdata(spi);
>> > +
>> > +	iio_device_unregister(indio_dev);
>> > +	data = iio_priv(indio_dev);
>> 
>> I would have put this inline with the declaration of data above.
>> It is pretty much the same level of lookup as spi_get_drvdata.
>> 
>> > +
>> > +	return regmap_field_write(data->reg_state,
>> MAX31722_MODE_STANDBY); }
>> > +
>> > +#ifdef CONFIG_PM_SLEEP
>> > +static int max31722_suspend(struct device *dev) {
>> > +	struct max31722_data *data;
>> > +
>> > +	data = iio_priv(spi_get_drvdata(to_spi_device(dev)));
>> > +
>> > +	return regmap_field_write(data->reg_state,
>> MAX31722_MODE_STANDBY); }
>> > +
>> > +static int max31722_resume(struct device *dev) {
>> > +	struct max31722_data *data;
>> > +
>> > +	data = iio_priv(spi_get_drvdata(to_spi_device(dev)));
>> > +
>> > +	return regmap_field_write(data->reg_state,
>> > +MAX31722_MODE_CONTINUOUS); }
>> > +
>> > +static SIMPLE_DEV_PM_OPS(max31722_pm_ops, max31722_suspend,
>> > +max31722_resume);
>> > +
>> > +#define MAX31722_PM_OPS (&max31722_pm_ops) #else #define
>> > +MAX31722_PM_OPS NULL #endif
>> > +
>> > +static const struct spi_device_id max31722_spi_id[] = {
>> > +	{"max31722", 0},
>> > +	{"max31723", 0},
>> > +	{}
>> > +};
>> > +
>> > +static const struct acpi_device_id max31722_acpi_id[] = {
>> > +	{"MAX31722", 0},
>> > +	{"MAX31723", 0},
>> > +	{}
>> > +};
>> > +
>> > +MODULE_DEVICE_TABLE(spi, max31722_spi_id);
>> > +
>> > +static struct spi_driver max31722_driver = {
>> > +	.driver = {
>> > +		.name = "max31722",
>> > +		.pm = MAX31722_PM_OPS,
>> > +		.acpi_match_table = ACPI_PTR(max31722_acpi_id),
>> > +	},
>> > +	.probe =            max31722_probe,
>> > +	.remove =           max31722_remove,
>> > +	.id_table =         max31722_spi_id,
>> > +};
>> > +
>> > +module_spi_driver(max31722_driver);
>> > +
>> > +MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
>> > +MODULE_DESCRIPTION("MAX31722 digital thermometer and thermostat
>> SPI
>> > +driver"); MODULE_LICENSE("GPL v2");
>> >
>
>--
>To unsubscribe from this list: send the line "unsubscribe linux-iio" in
>the body of a message to majordomo@vger.kernel.org
>More majordomo info at  http://vger.kernel.org/majordomo-info.html

-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.

[PATCH 2/2] iio: temperature: Add threshold interrupt support for max31722

[Tiberiu Breana]

Added interrupt support for high/low temperature threshold
events to the max31722 driver.

Signed-off-by: Tiberiu Breana <tiberiu.a.breana@intel.com>
---
 drivers/iio/temperature/max31722.c | 303 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 301 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/temperature/max31722.c b/drivers/iio/temperature/max31722.c
index fa833b6..a8bfe35 100644
--- a/drivers/iio/temperature/max31722.c
+++ b/drivers/iio/temperature/max31722.c
@@ -10,21 +10,32 @@
 
 #include <linux/kernel.h>
 #include <linux/acpi.h>
+#include <linux/gpio/consumer.h>
+#include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/regmap.h>
 #include <linux/spi/spi.h>
+#include <linux/iio/events.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 
 #define MAX31722_REG_CFG				0x00
 #define MAX31722_REG_TEMP_LSB			0x01
 #define MAX31722_REG_TEMP_MSB			0x02
+#define MAX31722_REG_THIGH_LSB         0x03
+#define MAX31722_REG_TLOW_LSB          0x05
 #define MAX31722_MAX_REG				0x86
 
 #define MAX31722_MODE_CONTINUOUS		0x00
 #define MAX31722_MODE_STANDBY			0x01
+#define MAX31722_MODE_THERMOSTAT       0x80
+
+#define MAX31722_MIN_TEMP          -55
+#define MAX31722_MAX_TEMP          125
 
 #define MAX31722_REGMAP_NAME			"max31722_regmap"
+#define MAX31722_EVENT             "max31722_event"
+#define MAX31722_GPIO              "max31722_gpio"
 
 #define MAX31722_SCALE_AVAILABLE		"0.5 0.25 0.125 0.0625"
 
@@ -43,6 +54,8 @@ static const struct reg_field max31722_reg_field_state =
 				REG_FIELD(MAX31722_REG_CFG, 0, 0);
 static const struct reg_field max31722_reg_field_resolution =
 				REG_FIELD(MAX31722_REG_CFG, 1, 2);
+static const struct reg_field max31722_reg_field_thermostat =
+				REG_FIELD(MAX31722_REG_CFG, 3, 3);
 
 struct max31722_data {
 	struct spi_device *spi_device;
@@ -50,6 +63,8 @@ struct max31722_data {
 	struct regmap *regmap;
 	struct regmap_field *reg_state;
 	struct regmap_field *reg_resolution;
+	struct regmap_field *reg_thermostat;
+	u64 timestamp;
 };
 
 /*
@@ -71,11 +86,30 @@ static const struct attribute_group max31722_attribute_group = {
 	.attrs = max31722_attributes
 };
 
+static const struct iio_event_spec max31722_events[] = {
+	/* High temperature event */
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_RISING,
+		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
+				 BIT(IIO_EV_INFO_ENABLE),
+	},
+	/* Low temperature event */
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_FALLING,
+		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
+				 BIT(IIO_EV_INFO_ENABLE),
+	},
+};
+
 static const struct iio_chan_spec max31722_channels[] = {
 	{
 		.type = IIO_TEMP,
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 				      BIT(IIO_CHAN_INFO_SCALE),
+		.event_spec = max31722_events,
+		.num_event_specs = ARRAY_SIZE(max31722_events),
 	},
 };
 
@@ -167,6 +201,172 @@ static void max31722_reg_to_float(u16 reg_val, int *val, int *val2)
 	}
 }
 
+/* Convert a floating point value to a register value. */
+static u16 max31722_float_to_reg(int val, int val2)
+{
+	int i;
+	bool negative_nr;
+	u8 lsb;
+	u16 reg_val;
+
+	negative_nr = (val & 0x80) || val2 < 0;
+	if (val2 < 0)
+		val2 *= -1;
+
+	/*
+	 * The LSB value will be an approximation of val2
+	 * due to its limited 4-bit range.
+	 */
+	lsb = 0;
+	for (i = 0 ; i < ARRAY_SIZE(max31722_scale_table) && val2 > 0; i++)
+		if (val2 - max31722_scale_table[i] >= 0) {
+			val2 -= max31722_scale_table[i];
+			lsb += 1 << (4 - i - 1);
+		}
+	lsb <<= 4;
+
+	if (negative_nr) {
+		/*
+		 * Negative value. Temporarily use the complement of val for
+		 * the MSB, then concatenate the LSB, reverse bits & add 1 for
+		 * the final value.
+		 */
+		u8 msb = (u8)(-1 * val);
+		u16 rev = 0;
+		int num_bits = sizeof(rev) * 8;
+
+		reg_val = (msb << 8) | lsb;
+
+		for (i = 0 ; i < num_bits ; i++) {
+			rev |= !(reg_val & 0x01) << i;
+			reg_val >>= 1;
+		}
+		rev += 1;
+		return rev;
+
+	} else {
+		reg_val = ((u8)val << 8) | lsb;
+	}
+
+	return reg_val;
+}
+
+static int max31722_read_event_config(struct iio_dev *indio_dev,
+				      const struct iio_chan_spec *chan,
+				      enum iio_event_type type,
+				      enum iio_event_direction dir)
+{
+	unsigned int event_val;
+	int ret;
+	struct max31722_data *data = iio_priv(indio_dev);
+	struct spi_device *spi = data->spi_device;
+
+	mutex_lock(&data->lock);
+	ret = regmap_field_read(data->reg_thermostat, &event_val);
+	if (ret < 0) {
+		dev_err(&spi->dev, "failed to read thermostat status\n");
+		mutex_unlock(&data->lock);
+		return ret;
+	}
+	mutex_unlock(&data->lock);
+
+	return event_val;
+}
+
+static int max31722_write_event_config(struct iio_dev *indio_dev,
+				       const struct iio_chan_spec *chan,
+				       enum iio_event_type type,
+				       enum iio_event_direction dir,
+				       int state)
+{
+	int ret;
+	struct max31722_data *data = iio_priv(indio_dev);
+	struct spi_device *spi = data->spi_device;
+
+	if (state != 0 && state != 1)
+		return -EINVAL;
+
+	/*
+	 * Set thermostat mode:
+	 * 0 : comparator mode (default)
+	 * 1 : interrupt mode
+	 */
+	mutex_lock(&data->lock);
+	ret = regmap_field_write(data->reg_thermostat, state);
+	if (ret < 0)
+		dev_err(&spi->dev, "failed to set thermostat mode\n");
+	mutex_unlock(&data->lock);
+
+	return ret;
+}
+
+static int max31722_read_event(struct iio_dev *indio_dev,
+			       const struct iio_chan_spec *chan,
+			       enum iio_event_type type,
+			       enum iio_event_direction dir,
+			       enum iio_event_info info,
+			       int *val, int *val2)
+{
+	int ret;
+	u8 reg;
+	u16 buf;
+	struct max31722_data *data = iio_priv(indio_dev);
+
+	if (info != IIO_EV_INFO_VALUE)
+		return -EINVAL;
+
+	if (dir == IIO_EV_DIR_RISING)
+		reg = MAX31722_REG_THIGH_LSB;
+	else if (dir == IIO_EV_DIR_FALLING)
+		reg = MAX31722_REG_TLOW_LSB;
+	else
+		return -EINVAL;
+
+	mutex_lock(&data->lock);
+	ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
+	mutex_unlock(&data->lock);
+	if (ret < 0) {
+		dev_err(&data->spi_device->dev,
+			"failed to read threshold register\n");
+		return ret;
+	}
+	max31722_reg_to_float(buf, val, val2);
+
+	return IIO_VAL_INT_PLUS_MICRO;
+}
+
+static int max31722_write_event(struct iio_dev *indio_dev,
+				const struct iio_chan_spec *chan,
+				enum iio_event_type type,
+				enum iio_event_direction dir,
+				enum iio_event_info info,
+				int val, int val2)
+{
+	int ret;
+	u8 reg;
+	u16 buf;
+	struct max31722_data *data = iio_priv(indio_dev);
+
+	if (val < MAX31722_MIN_TEMP || val > MAX31722_MAX_TEMP)
+		return -EINVAL;
+
+	if (dir == IIO_EV_DIR_RISING)
+		reg = MAX31722_REG_THIGH_LSB;
+	else if (dir == IIO_EV_DIR_FALLING)
+		reg = MAX31722_REG_TLOW_LSB;
+	else
+		return -EINVAL;
+
+	buf = max31722_float_to_reg(val, val2);
+
+	ret = regmap_bulk_write(data->regmap, reg, &buf, 2);
+	if (ret < 0)
+		dev_err(&data->spi_device->dev,
+			"failed to write threshold register\n");
+
+	return ret;
+}
+
 static int max31722_read_raw(struct iio_dev *indio_dev,
 			     struct iio_chan_spec const *chan,
 			     int *val, int *val2, long mask)
@@ -241,8 +441,63 @@ static const struct iio_info max31722_info = {
 	.read_raw		= max31722_read_raw,
 	.write_raw		= max31722_write_raw,
 	.attrs			= &max31722_attribute_group,
+	.read_event_value	= max31722_read_event,
+	.write_event_value	= max31722_write_event,
+	.read_event_config	= max31722_read_event_config,
+	.write_event_config	= max31722_write_event_config,
 };
 
+static irqreturn_t max31722_irq_handler(int irq, void *private)
+{
+	struct iio_dev *indio_dev = private;
+	struct max31722_data *data = iio_priv(indio_dev);
+
+	data->timestamp = iio_get_time_ns();
+
+	return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t max31722_irq_event_handler(int irq, void *private)
+{
+	int ret;
+	u64 event;
+	u16 temp;
+	u16 tlow;
+	u16 thigh;
+	unsigned int dir;
+	struct iio_dev *indio_dev = private;
+	struct max31722_data *data = iio_priv(indio_dev);
+
+	/*
+	 * Do a quick temperature reading and compare it with TLOW/THIGH
+	 * so we can tell which threshold has been met.
+	 */
+	mutex_lock(&data->lock);
+	ret = regmap_bulk_read(data->regmap, MAX31722_REG_TEMP_LSB, &temp, 2);
+	if (ret < 0)
+		goto exit_err;
+	ret = regmap_bulk_read(data->regmap, MAX31722_REG_TLOW_LSB, &tlow, 2);
+	if (ret < 0)
+		goto exit_err;
+	ret = regmap_bulk_read(data->regmap, MAX31722_REG_THIGH_LSB, &thigh, 2);
+	if (ret < 0)
+		goto exit_err;
+	mutex_unlock(&data->lock);
+
+	dir = (temp > thigh ? 1 : 0);
+	event = IIO_UNMOD_EVENT_CODE(IIO_TEMP, 0, IIO_EV_TYPE_THRESH,
+				     (dir ? IIO_EV_DIR_RISING :
+					    IIO_EV_DIR_FALLING));
+	iio_push_event(indio_dev, event, data->timestamp);
+
+	return IRQ_HANDLED;
+
+exit_err:
+	dev_err(&data->spi_device->dev, "failed to read temperature register\n");
+	mutex_unlock(&data->lock);
+	return ret;
+}
+
 static int max31722_init(struct max31722_data *data)
 {
 	int ret = 0;
@@ -259,15 +514,40 @@ static int max31722_init(struct max31722_data *data)
 
 	MAX31722_REGFIELD(state);
 	MAX31722_REGFIELD(resolution);
+	MAX31722_REGFIELD(thermostat);
 
 	/* Set SD bit to 0 so we can have continuous measurements. */
 	ret = regmap_field_write(data->reg_state, MAX31722_MODE_CONTINUOUS);
+	if (ret < 0) {
+		dev_err(&spi->dev, "failed to configure sensor.\n");
+		return ret;
+	}
+
+	/* Set thermostat interrupt mode */
+	ret = regmap_field_write(data->reg_thermostat, 1);
 	if (ret < 0)
 		dev_err(&spi->dev, "failed to configure sensor.\n");
 
 	return ret;
 }
 
+static int max31722_gpio_probe(struct spi_device *spi)
+{
+	struct gpio_desc *gpio;
+
+	if (!spi)
+		return -EINVAL;
+
+	/* gpio interrupt pin */
+	gpio = devm_gpiod_get_index(&spi->dev, MAX31722_GPIO, 0, GPIOD_IN);
+	if (IS_ERR(gpio)) {
+		dev_err(&spi->dev, "gpio request failed.\n");
+		return PTR_ERR(gpio);
+	}
+
+	return gpiod_to_irq(gpio);
+}
+
 static int max31722_probe(struct spi_device *spi)
 {
 	int ret;
@@ -294,15 +574,34 @@ static int max31722_probe(struct spi_device *spi)
 
 	ret = max31722_init(data);
 	if (ret < 0)
-		return ret;
+		goto err_standby;
+
+	ret = max31722_gpio_probe(data->spi_device);
+	if (ret < 0)
+		goto err_standby;
+
+	spi->irq = ret;
+	ret = devm_request_threaded_irq(&spi->dev, spi->irq,
+					max31722_irq_handler,
+					max31722_irq_event_handler,
+					IRQF_TRIGGER_LOW,
+					MAX31722_EVENT, indio_dev);
+	if (ret < 0) {
+		dev_err(&spi->dev, "request irq %d failed\n", spi->irq);
+		goto err_standby;
+	}
 
 	ret = iio_device_register(indio_dev);
 	if (ret < 0) {
 		dev_err(&spi->dev, "iio_device_register failed\n");
-		regmap_field_write(data->reg_state, MAX31722_MODE_STANDBY);
+		goto err_standby;
 	}
 
 	return ret;
+
+err_standby:
+	regmap_field_write(data->reg_state, MAX31722_MODE_STANDBY);
+	return ret;
 }
 
 static int max31722_remove(struct spi_device *spi)
-- 
1.9.1

Re: [PATCH 2/2] iio: temperature: Add threshold interrupt support for max31722

[Jonathan Cameron]

On 09/03/16 13:30, Tiberiu Breana wrote:
> Added interrupt support for high/low temperature threshold
> events to the max31722 driver.
> 
> Signed-off-by: Tiberiu Breana <tiberiu.a.breana@intel.com>
Only comment in here is that you might be better off reporting the
event direction as IIO_EVENT_DIR_EITHER and leaving the figuring out
which case occured to userspace.

This case is iritatingly common!

Jonathan
> ---
>  drivers/iio/temperature/max31722.c | 303 ++++++++++++++++++++++++++++++++++++-
>  1 file changed, 301 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/temperature/max31722.c b/drivers/iio/temperature/max31722.c
> index fa833b6..a8bfe35 100644
> --- a/drivers/iio/temperature/max31722.c
> +++ b/drivers/iio/temperature/max31722.c
> @@ -10,21 +10,32 @@
>  
>  #include <linux/kernel.h>
>  #include <linux/acpi.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/interrupt.h>
>  #include <linux/module.h>
>  #include <linux/regmap.h>
>  #include <linux/spi/spi.h>
> +#include <linux/iio/events.h>
>  #include <linux/iio/iio.h>
>  #include <linux/iio/sysfs.h>
>  
>  #define MAX31722_REG_CFG				0x00
>  #define MAX31722_REG_TEMP_LSB			0x01
>  #define MAX31722_REG_TEMP_MSB			0x02
> +#define MAX31722_REG_THIGH_LSB         0x03
> +#define MAX31722_REG_TLOW_LSB          0x05
>  #define MAX31722_MAX_REG				0x86
>  
>  #define MAX31722_MODE_CONTINUOUS		0x00
>  #define MAX31722_MODE_STANDBY			0x01
> +#define MAX31722_MODE_THERMOSTAT       0x80
> +
> +#define MAX31722_MIN_TEMP          -55
> +#define MAX31722_MAX_TEMP          125
>  
>  #define MAX31722_REGMAP_NAME			"max31722_regmap"
> +#define MAX31722_EVENT             "max31722_event"
> +#define MAX31722_GPIO              "max31722_gpio"
>  
>  #define MAX31722_SCALE_AVAILABLE		"0.5 0.25 0.125 0.0625"
>  
> @@ -43,6 +54,8 @@ static const struct reg_field max31722_reg_field_state =
>  				REG_FIELD(MAX31722_REG_CFG, 0, 0);
>  static const struct reg_field max31722_reg_field_resolution =
>  				REG_FIELD(MAX31722_REG_CFG, 1, 2);
> +static const struct reg_field max31722_reg_field_thermostat =
> +				REG_FIELD(MAX31722_REG_CFG, 3, 3);
>  
>  struct max31722_data {
>  	struct spi_device *spi_device;
> @@ -50,6 +63,8 @@ struct max31722_data {
>  	struct regmap *regmap;
>  	struct regmap_field *reg_state;
>  	struct regmap_field *reg_resolution;
> +	struct regmap_field *reg_thermostat;
> +	u64 timestamp;
>  };
>  
>  /*
> @@ -71,11 +86,30 @@ static const struct attribute_group max31722_attribute_group = {
>  	.attrs = max31722_attributes
>  };
>  
> +static const struct iio_event_spec max31722_events[] = {
> +	/* High temperature event */
> +	{
> +		.type = IIO_EV_TYPE_THRESH,
> +		.dir = IIO_EV_DIR_RISING,
> +		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
> +				 BIT(IIO_EV_INFO_ENABLE),
> +	},
> +	/* Low temperature event */
> +	{
> +		.type = IIO_EV_TYPE_THRESH,
> +		.dir = IIO_EV_DIR_FALLING,
> +		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
> +				 BIT(IIO_EV_INFO_ENABLE),
> +	},
> +};
> +
>  static const struct iio_chan_spec max31722_channels[] = {
>  	{
>  		.type = IIO_TEMP,
>  		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
>  				      BIT(IIO_CHAN_INFO_SCALE),
> +		.event_spec = max31722_events,
> +		.num_event_specs = ARRAY_SIZE(max31722_events),
>  	},
>  };
>  
> @@ -167,6 +201,172 @@ static void max31722_reg_to_float(u16 reg_val, int *val, int *val2)
>  	}
>  }
>  
> +/* Convert a floating point value to a register value. */
> +static u16 max31722_float_to_reg(int val, int val2)
> +{
> +	int i;
> +	bool negative_nr;
> +	u8 lsb;
> +	u16 reg_val;
> +
> +	negative_nr = (val & 0x80) || val2 < 0;
> +	if (val2 < 0)
> +		val2 *= -1;
> +
> +	/*
> +	 * The LSB value will be an approximation of val2
> +	 * due to its limited 4-bit range.
> +	 */
> +	lsb = 0;
> +	for (i = 0 ; i < ARRAY_SIZE(max31722_scale_table) && val2 > 0; i++)
> +		if (val2 - max31722_scale_table[i] >= 0) {
> +			val2 -= max31722_scale_table[i];
> +			lsb += 1 << (4 - i - 1);
> +		}
> +	lsb <<= 4;
> +
> +	if (negative_nr) {
> +		/*
> +		 * Negative value. Temporarily use the complement of val for
> +		 * the MSB, then concatenate the LSB, reverse bits & add 1 for
> +		 * the final value.
> +		 */
> +		u8 msb = (u8)(-1 * val);
> +		u16 rev = 0;
> +		int num_bits = sizeof(rev) * 8;
> +
> +		reg_val = (msb << 8) | lsb;
> +
> +		for (i = 0 ; i < num_bits ; i++) {
> +			rev |= !(reg_val & 0x01) << i;
> +			reg_val >>= 1;
> +		}
> +		rev += 1;
> +		return rev;
> +
> +	} else {
> +		reg_val = ((u8)val << 8) | lsb;
> +	}
> +
> +	return reg_val;
> +}
> +
> +static int max31722_read_event_config(struct iio_dev *indio_dev,
> +				      const struct iio_chan_spec *chan,
> +				      enum iio_event_type type,
> +				      enum iio_event_direction dir)
> +{
> +	unsigned int event_val;
> +	int ret;
> +	struct max31722_data *data = iio_priv(indio_dev);
> +	struct spi_device *spi = data->spi_device;
> +
> +	mutex_lock(&data->lock);
> +	ret = regmap_field_read(data->reg_thermostat, &event_val);
> +	if (ret < 0) {
> +		dev_err(&spi->dev, "failed to read thermostat status\n");
> +		mutex_unlock(&data->lock);
> +		return ret;
> +	}
> +	mutex_unlock(&data->lock);
> +
> +	return event_val;
> +}
> +
> +static int max31722_write_event_config(struct iio_dev *indio_dev,
> +				       const struct iio_chan_spec *chan,
> +				       enum iio_event_type type,
> +				       enum iio_event_direction dir,
> +				       int state)
> +{
> +	int ret;
> +	struct max31722_data *data = iio_priv(indio_dev);
> +	struct spi_device *spi = data->spi_device;
> +
> +	if (state != 0 && state != 1)
> +		return -EINVAL;
> +
> +	/*
> +	 * Set thermostat mode:
> +	 * 0 : comparator mode (default)
> +	 * 1 : interrupt mode
> +	 */
> +	mutex_lock(&data->lock);
> +	ret = regmap_field_write(data->reg_thermostat, state);
> +	if (ret < 0)
> +		dev_err(&spi->dev, "failed to set thermostat mode\n");
> +	mutex_unlock(&data->lock);
> +
> +	return ret;
> +}
> +
> +static int max31722_read_event(struct iio_dev *indio_dev,
> +			       const struct iio_chan_spec *chan,
> +			       enum iio_event_type type,
> +			       enum iio_event_direction dir,
> +			       enum iio_event_info info,
> +			       int *val, int *val2)
> +{
> +	int ret;
> +	u8 reg;
> +	u16 buf;
> +	struct max31722_data *data = iio_priv(indio_dev);
> +
> +	if (info != IIO_EV_INFO_VALUE)
> +		return -EINVAL;
> +
> +	if (dir == IIO_EV_DIR_RISING)
> +		reg = MAX31722_REG_THIGH_LSB;
> +	else if (dir == IIO_EV_DIR_FALLING)
> +		reg = MAX31722_REG_TLOW_LSB;
> +	else
> +		return -EINVAL;
> +
> +	mutex_lock(&data->lock);
> +	ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
> +	mutex_unlock(&data->lock);
> +	if (ret < 0) {
> +		dev_err(&data->spi_device->dev,
> +			"failed to read threshold register\n");
> +		return ret;
> +	}
> +	max31722_reg_to_float(buf, val, val2);
> +
> +	return IIO_VAL_INT_PLUS_MICRO;
> +}
> +
> +static int max31722_write_event(struct iio_dev *indio_dev,
> +				const struct iio_chan_spec *chan,
> +				enum iio_event_type type,
> +				enum iio_event_direction dir,
> +				enum iio_event_info info,
> +				int val, int val2)
> +{
> +	int ret;
> +	u8 reg;
> +	u16 buf;
> +	struct max31722_data *data = iio_priv(indio_dev);
> +
> +	if (val < MAX31722_MIN_TEMP || val > MAX31722_MAX_TEMP)
> +		return -EINVAL;
> +
> +	if (dir == IIO_EV_DIR_RISING)
> +		reg = MAX31722_REG_THIGH_LSB;
> +	else if (dir == IIO_EV_DIR_FALLING)
> +		reg = MAX31722_REG_TLOW_LSB;
> +	else
> +		return -EINVAL;
> +
> +	buf = max31722_float_to_reg(val, val2);
> +
> +	ret = regmap_bulk_write(data->regmap, reg, &buf, 2);
> +	if (ret < 0)
> +		dev_err(&data->spi_device->dev,
> +			"failed to write threshold register\n");
> +
> +	return ret;
> +}
> +
>  static int max31722_read_raw(struct iio_dev *indio_dev,
>  			     struct iio_chan_spec const *chan,
>  			     int *val, int *val2, long mask)
> @@ -241,8 +441,63 @@ static const struct iio_info max31722_info = {
>  	.read_raw		= max31722_read_raw,
>  	.write_raw		= max31722_write_raw,
>  	.attrs			= &max31722_attribute_group,
> +	.read_event_value	= max31722_read_event,
> +	.write_event_value	= max31722_write_event,
> +	.read_event_config	= max31722_read_event_config,
> +	.write_event_config	= max31722_write_event_config,
>  };
>  
> +static irqreturn_t max31722_irq_handler(int irq, void *private)
> +{
> +	struct iio_dev *indio_dev = private;
> +	struct max31722_data *data = iio_priv(indio_dev);
> +
> +	data->timestamp = iio_get_time_ns();
> +
> +	return IRQ_WAKE_THREAD;
> +}
> +
> +static irqreturn_t max31722_irq_event_handler(int irq, void *private)
> +{
> +	int ret;
> +	u64 event;
> +	u16 temp;
> +	u16 tlow;
> +	u16 thigh;
> +	unsigned int dir;
> +	struct iio_dev *indio_dev = private;
> +	struct max31722_data *data = iio_priv(indio_dev);
> +
> +	/*
> +	 * Do a quick temperature reading and compare it with TLOW/THIGH
> +	 * so we can tell which threshold has been met.
Hmm. Might end up detecting neither occured if the condition is no longer
met.  Iritating hardware!

We do have the 'magic' option of IIO_EV_DIR_EITHER to specify that we
don't know which one occured.  The idea of that has always been that
userspace can elect to do what you have here if it cares rather than
pushing this code into drivers.
> +	 */
> +	mutex_lock(&data->lock);
> +	ret = regmap_bulk_read(data->regmap, MAX31722_REG_TEMP_LSB, &temp, 2);
> +	if (ret < 0)
> +		goto exit_err;
> +	ret = regmap_bulk_read(data->regmap, MAX31722_REG_TLOW_LSB, &tlow, 2);
> +	if (ret < 0)
> +		goto exit_err;
> +	ret = regmap_bulk_read(data->regmap, MAX31722_REG_THIGH_LSB, &thigh, 2);
> +	if (ret < 0)
> +		goto exit_err;
> +	mutex_unlock(&data->lock);
> +
> +	dir = (temp > thigh ? 1 : 0);
> +	event = IIO_UNMOD_EVENT_CODE(IIO_TEMP, 0, IIO_EV_TYPE_THRESH,
> +				     (dir ? IIO_EV_DIR_RISING :
> +					    IIO_EV_DIR_FALLING));
> +	iio_push_event(indio_dev, event, data->timestamp);
> +
> +	return IRQ_HANDLED;
> +
> +exit_err:
> +	dev_err(&data->spi_device->dev, "failed to read temperature register\n");
> +	mutex_unlock(&data->lock);
> +	return ret;
> +}
> +
>  static int max31722_init(struct max31722_data *data)
>  {
>  	int ret = 0;
> @@ -259,15 +514,40 @@ static int max31722_init(struct max31722_data *data)
>  
>  	MAX31722_REGFIELD(state);
>  	MAX31722_REGFIELD(resolution);
> +	MAX31722_REGFIELD(thermostat);
>  
>  	/* Set SD bit to 0 so we can have continuous measurements. */
>  	ret = regmap_field_write(data->reg_state, MAX31722_MODE_CONTINUOUS);
> +	if (ret < 0) {
> +		dev_err(&spi->dev, "failed to configure sensor.\n");
> +		return ret;
> +	}
> +
> +	/* Set thermostat interrupt mode */
> +	ret = regmap_field_write(data->reg_thermostat, 1);
>  	if (ret < 0)
>  		dev_err(&spi->dev, "failed to configure sensor.\n");
>  
>  	return ret;
>  }
>  
> +static int max31722_gpio_probe(struct spi_device *spi)
> +{
> +	struct gpio_desc *gpio;
> +
> +	if (!spi)
> +		return -EINVAL;
> +
> +	/* gpio interrupt pin */
> +	gpio = devm_gpiod_get_index(&spi->dev, MAX31722_GPIO, 0, GPIOD_IN);
> +	if (IS_ERR(gpio)) {
> +		dev_err(&spi->dev, "gpio request failed.\n");
> +		return PTR_ERR(gpio);
> +	}
If this is an interrupt, why are we specifying it as a gpio?
> +
> +	return gpiod_to_irq(gpio);
> +}
> +
>  static int max31722_probe(struct spi_device *spi)
>  {
>  	int ret;
> @@ -294,15 +574,34 @@ static int max31722_probe(struct spi_device *spi)
>  
>  	ret = max31722_init(data);
>  	if (ret < 0)
> -		return ret;
> +		goto err_standby;
> +
> +	ret = max31722_gpio_probe(data->spi_device);
> +	if (ret < 0)
> +		goto err_standby;
> +
> +	spi->irq = ret;
> +	ret = devm_request_threaded_irq(&spi->dev, spi->irq,
> +					max31722_irq_handler,
> +					max31722_irq_event_handler,
> +					IRQF_TRIGGER_LOW,
> +					MAX31722_EVENT, indio_dev);
> +	if (ret < 0) {
> +		dev_err(&spi->dev, "request irq %d failed\n", spi->irq);
> +		goto err_standby;
> +	}
I would suggest you want to make the irq optional, though that could happen
at a later date when someone has a board where it isn't wired.
>  
>  	ret = iio_device_register(indio_dev);
>  	if (ret < 0) {
>  		dev_err(&spi->dev, "iio_device_register failed\n");
> -		regmap_field_write(data->reg_state, MAX31722_MODE_STANDBY);
> +		goto err_standby;
>  	}
>  
>  	return ret;
> +
> +err_standby:
> +	regmap_field_write(data->reg_state, MAX31722_MODE_STANDBY);
> +	return ret;
>  }
>  
>  static int max31722_remove(struct spi_device *spi)
> 

Re: [PATCH 2/2] iio: temperature: Add threshold interrupt support for max31722

[Daniel Baluta]

On Sat, Mar 12, 2016 at 12:17 PM, Jonathan Cameron <jic23@kernel.org> wrote:
> On 09/03/16 13:30, Tiberiu Breana wrote:
>> Added interrupt support for high/low temperature threshold
>> events to the max31722 driver.
>>
>> Signed-off-by: Tiberiu Breana <tiberiu.a.breana@intel.com>
> Only comment in here is that you might be better off reporting the
> event direction as IIO_EVENT_DIR_EITHER and leaving the figuring out
> which case occured to userspace.
>
> This case is iritatingly common!
>
> Jonathan
>> ---
>>  drivers/iio/temperature/max31722.c | 303 ++++++++++++++++++++++++++++++++++++-
>>  1 file changed, 301 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/iio/temperature/max31722.c b/drivers/iio/temperature/max31722.c
>> index fa833b6..a8bfe35 100644
>> --- a/drivers/iio/temperature/max31722.c
>> +++ b/drivers/iio/temperature/max31722.c
>> @@ -10,21 +10,32 @@
>>
>>  #include <linux/kernel.h>
>>  #include <linux/acpi.h>
>> +#include <linux/gpio/consumer.h>
>> +#include <linux/interrupt.h>
>>  #include <linux/module.h>
>>  #include <linux/regmap.h>
>>  #include <linux/spi/spi.h>
>> +#include <linux/iio/events.h>
>>  #include <linux/iio/iio.h>
>>  #include <linux/iio/sysfs.h>
>>
>>  #define MAX31722_REG_CFG                             0x00
>>  #define MAX31722_REG_TEMP_LSB                        0x01
>>  #define MAX31722_REG_TEMP_MSB                        0x02
>> +#define MAX31722_REG_THIGH_LSB         0x03
>> +#define MAX31722_REG_TLOW_LSB          0x05
>>  #define MAX31722_MAX_REG                             0x86
>>
>>  #define MAX31722_MODE_CONTINUOUS             0x00
>>  #define MAX31722_MODE_STANDBY                        0x01
>> +#define MAX31722_MODE_THERMOSTAT       0x80
>> +
>> +#define MAX31722_MIN_TEMP          -55
>> +#define MAX31722_MAX_TEMP          125
>>
>>  #define MAX31722_REGMAP_NAME                 "max31722_regmap"
>> +#define MAX31722_EVENT             "max31722_event"
>> +#define MAX31722_GPIO              "max31722_gpio"
>>
>>  #define MAX31722_SCALE_AVAILABLE             "0.5 0.25 0.125 0.0625"
>>
>> @@ -43,6 +54,8 @@ static const struct reg_field max31722_reg_field_state =
>>                               REG_FIELD(MAX31722_REG_CFG, 0, 0);
>>  static const struct reg_field max31722_reg_field_resolution =
>>                               REG_FIELD(MAX31722_REG_CFG, 1, 2);
>> +static const struct reg_field max31722_reg_field_thermostat =
>> +                             REG_FIELD(MAX31722_REG_CFG, 3, 3);
>>
>>  struct max31722_data {
>>       struct spi_device *spi_device;
>> @@ -50,6 +63,8 @@ struct max31722_data {
>>       struct regmap *regmap;
>>       struct regmap_field *reg_state;
>>       struct regmap_field *reg_resolution;
>> +     struct regmap_field *reg_thermostat;
>> +     u64 timestamp;
>>  };
>>
>>  /*
>> @@ -71,11 +86,30 @@ static const struct attribute_group max31722_attribute_group = {
>>       .attrs = max31722_attributes
>>  };
>>
>> +static const struct iio_event_spec max31722_events[] = {
>> +     /* High temperature event */
>> +     {
>> +             .type = IIO_EV_TYPE_THRESH,
>> +             .dir = IIO_EV_DIR_RISING,
>> +             .mask_separate = BIT(IIO_EV_INFO_VALUE) |
>> +                              BIT(IIO_EV_INFO_ENABLE),
>> +     },
>> +     /* Low temperature event */
>> +     {
>> +             .type = IIO_EV_TYPE_THRESH,
>> +             .dir = IIO_EV_DIR_FALLING,
>> +             .mask_separate = BIT(IIO_EV_INFO_VALUE) |
>> +                              BIT(IIO_EV_INFO_ENABLE),
>> +     },
>> +};
>> +
>>  static const struct iio_chan_spec max31722_channels[] = {
>>       {
>>               .type = IIO_TEMP,
>>               .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
>>                                     BIT(IIO_CHAN_INFO_SCALE),
>> +             .event_spec = max31722_events,
>> +             .num_event_specs = ARRAY_SIZE(max31722_events),
>>       },
>>  };
>>
>> @@ -167,6 +201,172 @@ static void max31722_reg_to_float(u16 reg_val, int *val, int *val2)
>>       }
>>  }
>>
>> +/* Convert a floating point value to a register value. */
>> +static u16 max31722_float_to_reg(int val, int val2)
>> +{
>> +     int i;
>> +     bool negative_nr;
>> +     u8 lsb;
>> +     u16 reg_val;
>> +
>> +     negative_nr = (val & 0x80) || val2 < 0;
>> +     if (val2 < 0)
>> +             val2 *= -1;
>> +
>> +     /*
>> +      * The LSB value will be an approximation of val2
>> +      * due to its limited 4-bit range.
>> +      */
>> +     lsb = 0;
>> +     for (i = 0 ; i < ARRAY_SIZE(max31722_scale_table) && val2 > 0; i++)
>> +             if (val2 - max31722_scale_table[i] >= 0) {
>> +                     val2 -= max31722_scale_table[i];
>> +                     lsb += 1 << (4 - i - 1);
>> +             }
>> +     lsb <<= 4;
>> +
>> +     if (negative_nr) {
>> +             /*
>> +              * Negative value. Temporarily use the complement of val for
>> +              * the MSB, then concatenate the LSB, reverse bits & add 1 for
>> +              * the final value.
>> +              */
>> +             u8 msb = (u8)(-1 * val);
>> +             u16 rev = 0;
>> +             int num_bits = sizeof(rev) * 8;
>> +
>> +             reg_val = (msb << 8) | lsb;
>> +
>> +             for (i = 0 ; i < num_bits ; i++) {
>> +                     rev |= !(reg_val & 0x01) << i;
>> +                     reg_val >>= 1;
>> +             }
>> +             rev += 1;
>> +             return rev;
>> +
>> +     } else {
>> +             reg_val = ((u8)val << 8) | lsb;
>> +     }
>> +
>> +     return reg_val;
>> +}
>> +
>> +static int max31722_read_event_config(struct iio_dev *indio_dev,
>> +                                   const struct iio_chan_spec *chan,
>> +                                   enum iio_event_type type,
>> +                                   enum iio_event_direction dir)
>> +{
>> +     unsigned int event_val;
>> +     int ret;
>> +     struct max31722_data *data = iio_priv(indio_dev);
>> +     struct spi_device *spi = data->spi_device;
>> +
>> +     mutex_lock(&data->lock);
>> +     ret = regmap_field_read(data->reg_thermostat, &event_val);
>> +     if (ret < 0) {
>> +             dev_err(&spi->dev, "failed to read thermostat status\n");
>> +             mutex_unlock(&data->lock);
>> +             return ret;
>> +     }
>> +     mutex_unlock(&data->lock);
>> +
>> +     return event_val;
>> +}
>> +
>> +static int max31722_write_event_config(struct iio_dev *indio_dev,
>> +                                    const struct iio_chan_spec *chan,
>> +                                    enum iio_event_type type,
>> +                                    enum iio_event_direction dir,
>> +                                    int state)
>> +{
>> +     int ret;
>> +     struct max31722_data *data = iio_priv(indio_dev);
>> +     struct spi_device *spi = data->spi_device;
>> +
>> +     if (state != 0 && state != 1)
>> +             return -EINVAL;
>> +
>> +     /*
>> +      * Set thermostat mode:
>> +      * 0 : comparator mode (default)
>> +      * 1 : interrupt mode
>> +      */
>> +     mutex_lock(&data->lock);
>> +     ret = regmap_field_write(data->reg_thermostat, state);
>> +     if (ret < 0)
>> +             dev_err(&spi->dev, "failed to set thermostat mode\n");
>> +     mutex_unlock(&data->lock);
>> +
>> +     return ret;
>> +}
>> +
>> +static int max31722_read_event(struct iio_dev *indio_dev,
>> +                            const struct iio_chan_spec *chan,
>> +                            enum iio_event_type type,
>> +                            enum iio_event_direction dir,
>> +                            enum iio_event_info info,
>> +                            int *val, int *val2)
>> +{
>> +     int ret;
>> +     u8 reg;
>> +     u16 buf;
>> +     struct max31722_data *data = iio_priv(indio_dev);
>> +
>> +     if (info != IIO_EV_INFO_VALUE)
>> +             return -EINVAL;
>> +
>> +     if (dir == IIO_EV_DIR_RISING)
>> +             reg = MAX31722_REG_THIGH_LSB;
>> +     else if (dir == IIO_EV_DIR_FALLING)
>> +             reg = MAX31722_REG_TLOW_LSB;
>> +     else
>> +             return -EINVAL;
>> +
>> +     mutex_lock(&data->lock);
>> +     ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
>> +     mutex_unlock(&data->lock);
>> +     if (ret < 0) {
>> +             dev_err(&data->spi_device->dev,
>> +                     "failed to read threshold register\n");
>> +             return ret;
>> +     }
>> +     max31722_reg_to_float(buf, val, val2);
>> +
>> +     return IIO_VAL_INT_PLUS_MICRO;
>> +}
>> +
>> +static int max31722_write_event(struct iio_dev *indio_dev,
>> +                             const struct iio_chan_spec *chan,
>> +                             enum iio_event_type type,
>> +                             enum iio_event_direction dir,
>> +                             enum iio_event_info info,
>> +                             int val, int val2)
>> +{
>> +     int ret;
>> +     u8 reg;
>> +     u16 buf;
>> +     struct max31722_data *data = iio_priv(indio_dev);
>> +
>> +     if (val < MAX31722_MIN_TEMP || val > MAX31722_MAX_TEMP)
>> +             return -EINVAL;
>> +
>> +     if (dir == IIO_EV_DIR_RISING)
>> +             reg = MAX31722_REG_THIGH_LSB;
>> +     else if (dir == IIO_EV_DIR_FALLING)
>> +             reg = MAX31722_REG_TLOW_LSB;
>> +     else
>> +             return -EINVAL;
>> +
>> +     buf = max31722_float_to_reg(val, val2);
>> +
>> +     ret = regmap_bulk_write(data->regmap, reg, &buf, 2);
>> +     if (ret < 0)
>> +             dev_err(&data->spi_device->dev,
>> +                     "failed to write threshold register\n");
>> +
>> +     return ret;
>> +}
>> +
>>  static int max31722_read_raw(struct iio_dev *indio_dev,
>>                            struct iio_chan_spec const *chan,
>>                            int *val, int *val2, long mask)
>> @@ -241,8 +441,63 @@ static const struct iio_info max31722_info = {
>>       .read_raw               = max31722_read_raw,
>>       .write_raw              = max31722_write_raw,
>>       .attrs                  = &max31722_attribute_group,
>> +     .read_event_value       = max31722_read_event,
>> +     .write_event_value      = max31722_write_event,
>> +     .read_event_config      = max31722_read_event_config,
>> +     .write_event_config     = max31722_write_event_config,
>>  };
>>
>> +static irqreturn_t max31722_irq_handler(int irq, void *private)
>> +{
>> +     struct iio_dev *indio_dev = private;
>> +     struct max31722_data *data = iio_priv(indio_dev);
>> +
>> +     data->timestamp = iio_get_time_ns();
>> +
>> +     return IRQ_WAKE_THREAD;
>> +}
>> +
>> +static irqreturn_t max31722_irq_event_handler(int irq, void *private)
>> +{
>> +     int ret;
>> +     u64 event;
>> +     u16 temp;
>> +     u16 tlow;
>> +     u16 thigh;
>> +     unsigned int dir;
>> +     struct iio_dev *indio_dev = private;
>> +     struct max31722_data *data = iio_priv(indio_dev);
>> +
>> +     /*
>> +      * Do a quick temperature reading and compare it with TLOW/THIGH
>> +      * so we can tell which threshold has been met.
> Hmm. Might end up detecting neither occured if the condition is no longer
> met.  Iritating hardware!
>
> We do have the 'magic' option of IIO_EV_DIR_EITHER to specify that we
> don't know which one occured.  The idea of that has always been that
> userspace can elect to do what you have here if it cares rather than
> pushing this code into drivers.
>> +      */
>> +     mutex_lock(&data->lock);
>> +     ret = regmap_bulk_read(data->regmap, MAX31722_REG_TEMP_LSB, &temp, 2);
>> +     if (ret < 0)
>> +             goto exit_err;
>> +     ret = regmap_bulk_read(data->regmap, MAX31722_REG_TLOW_LSB, &tlow, 2);
>> +     if (ret < 0)
>> +             goto exit_err;
>> +     ret = regmap_bulk_read(data->regmap, MAX31722_REG_THIGH_LSB, &thigh, 2);
>> +     if (ret < 0)
>> +             goto exit_err;
>> +     mutex_unlock(&data->lock);
>> +
>> +     dir = (temp > thigh ? 1 : 0);
>> +     event = IIO_UNMOD_EVENT_CODE(IIO_TEMP, 0, IIO_EV_TYPE_THRESH,
>> +                                  (dir ? IIO_EV_DIR_RISING :
>> +                                         IIO_EV_DIR_FALLING));
>> +     iio_push_event(indio_dev, event, data->timestamp);
>> +
>> +     return IRQ_HANDLED;
>> +
>> +exit_err:
>> +     dev_err(&data->spi_device->dev, "failed to read temperature register\n");
>> +     mutex_unlock(&data->lock);
>> +     return ret;
>> +}
>> +
>>  static int max31722_init(struct max31722_data *data)
>>  {
>>       int ret = 0;
>> @@ -259,15 +514,40 @@ static int max31722_init(struct max31722_data *data)
>>
>>       MAX31722_REGFIELD(state);
>>       MAX31722_REGFIELD(resolution);
>> +     MAX31722_REGFIELD(thermostat);
>>
>>       /* Set SD bit to 0 so we can have continuous measurements. */
>>       ret = regmap_field_write(data->reg_state, MAX31722_MODE_CONTINUOUS);
>> +     if (ret < 0) {
>> +             dev_err(&spi->dev, "failed to configure sensor.\n");
>> +             return ret;
>> +     }
>> +
>> +     /* Set thermostat interrupt mode */
>> +     ret = regmap_field_write(data->reg_thermostat, 1);
>>       if (ret < 0)
>>               dev_err(&spi->dev, "failed to configure sensor.\n");
>>
>>       return ret;
>>  }
>>
>> +static int max31722_gpio_probe(struct spi_device *spi)
>> +{
>> +     struct gpio_desc *gpio;
>> +
>> +     if (!spi)
>> +             return -EINVAL;
>> +
>> +     /* gpio interrupt pin */
>> +     gpio = devm_gpiod_get_index(&spi->dev, MAX31722_GPIO, 0, GPIOD_IN);
>> +     if (IS_ERR(gpio)) {
>> +             dev_err(&spi->dev, "gpio request failed.\n");
>> +             return PTR_ERR(gpio);
>> +     }
> If this is an interrupt, why are we specifying it as a gpio?

It is an interrupt requested on a GPIO pin. Isn't this the standard
way of mapping
a GPIO pin to an IRQ? Anyhow, as explained below this is no longer needed.

>> +
>> +     return gpiod_to_irq(gpio);
>> +}
>> +
>>  static int max31722_probe(struct spi_device *spi)
>>  {
>>       int ret;
>> @@ -294,15 +574,34 @@ static int max31722_probe(struct spi_device *spi)
>>
>>       ret = max31722_init(data);
>>       if (ret < 0)
>> -             return ret;
>> +             goto err_standby;
>> +
>> +     ret = max31722_gpio_probe(data->spi_device);
>> +     if (ret < 0)
>> +             goto err_standby;
>> +
>> +     spi->irq = ret;

If ACPI or DT is properly configured spi->irq should already contain the correct
irq number. We used the gpio_probe approach when ACPI didn't save the interrupt
number. Newer kernel version shouldn't have this problem.

>> +     ret = devm_request_threaded_irq(&spi->dev, spi->irq,
>> +                                     max31722_irq_handler,
>> +                                     max31722_irq_event_handler,
>> +                                     IRQF_TRIGGER_LOW,
>> +                                     MAX31722_EVENT, indio_dev);
>> +     if (ret < 0) {
>> +             dev_err(&spi->dev, "request irq %d failed\n", spi->irq);
>> +             goto err_standby;
>> +     }
> I would suggest you want to make the irq optional, though that could happen
> at a later date when someone has a board where it isn't wired.

Agree. We had previous experience with unwired interrupts pins.

>>
>>       ret = iio_device_register(indio_dev);
>>       if (ret < 0) {
>>               dev_err(&spi->dev, "iio_device_register failed\n");
>> -             regmap_field_write(data->reg_state, MAX31722_MODE_STANDBY);
>> +             goto err_standby;
>>       }
>>
>>       return ret;
>> +
>> +err_standby:
>> +     regmap_field_write(data->reg_state, MAX31722_MODE_STANDBY);
>> +     return ret;
>>  }
>>
>>  static int max31722_remove(struct spi_device *spi)
>>
>
> --
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RE: [PATCH 2/2] iio: temperature: Add threshold interrupt support for max31722

[Breana, Tiberiu A]

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Re: [PATCH 0/2] Add support for MAX31722/MAX31723 temperature sensors

[Jonathan Cameron]

On 09/03/16 13:30, Tiberiu Breana wrote:
> This patch set adds support for the MAX31722/MAX31723 temperature sensors /
> thermostats.
> Patch 1 adds basic support and power management.
> Patch 2 adds threshold interrupt support.
> 
> Tiberiu Breana (2):
>   iio: temperature: Add support for MAX31722/MAX31723 temperature
>     sensors
>   iio: temperature: Add threshold interrupt support for max31722
> 
>  drivers/iio/temperature/Kconfig    |  12 +
>  drivers/iio/temperature/Makefile   |   1 +
>  drivers/iio/temperature/max31722.c | 673 +++++++++++++++++++++++++++++++++++++
>  3 files changed, 686 insertions(+)
>  create mode 100644 drivers/iio/temperature/max31722.c
> 
Hi Tiberiu,

When proposing a temperature sensor driver, we need some additional justification
for why it is suited for IIO rather than the more focused (and in someways simpler)
hwmon.

So far we have had thermophiles that don't fit in as devices typically used for
hardware monitoring. Also in there are a few drivers which are for parts where
they are a cut down version of a more complex sensor (the measurement specialties
parts are either pressure sensors or humidty sensors at least in terms of what they
share interfaces with)

Also, please cc the hwmon maintainers (and probably list) as we want their agreement.

Jonathan

RE: [PATCH 0/2] Add support for MAX31722/MAX31723 temperature sensors

[Breana, Tiberiu A]

Hello Guenter, hwmon,

We have a dilemma as to wether this device driver belongs in IIO or hwmon:
https://datasheets.maximintegrated.com/en/ds/MAX31722-MAX31723.pdf

Could you please give us your opinion on this?
Thanks,

Tiberiu

> -----Original Message-----
> From: linux-iio-owner@vger.kernel.org [mailto:linux-iio-
> owner@vger.kernel.org] On Behalf Of Jonathan Cameron
> Sent: Wednesday, March 9, 2016 10:32 PM
> To: Breana, Tiberiu A <tiberiu.a.breana@intel.com>; linux-
> iio@vger.kernel.org
> Subject: Re: [PATCH 0/2] Add support for MAX31722/MAX31723
> temperature sensors
>=20
> On 09/03/16 13:30, Tiberiu Breana wrote:
> > This patch set adds support for the MAX31722/MAX31723 temperature
> > sensors / thermostats.
> > Patch 1 adds basic support and power management.
> > Patch 2 adds threshold interrupt support.
> >
> > Tiberiu Breana (2):
> >   iio: temperature: Add support for MAX31722/MAX31723 temperature
> >     sensors
> >   iio: temperature: Add threshold interrupt support for max31722
> >
> >  drivers/iio/temperature/Kconfig    |  12 +
> >  drivers/iio/temperature/Makefile   |   1 +
> >  drivers/iio/temperature/max31722.c | 673
> > +++++++++++++++++++++++++++++++++++++
> >  3 files changed, 686 insertions(+)
> >  create mode 100644 drivers/iio/temperature/max31722.c
> >
> Hi Tiberiu,
>=20
> When proposing a temperature sensor driver, we need some additional
> justification for why it is suited for IIO rather than the more focused (=
and in
> someways simpler) hwmon.
>=20
> So far we have had thermophiles that don't fit in as devices typically us=
ed for
> hardware monitoring. Also in there are a few drivers which are for parts
> where they are a cut down version of a more complex sensor (the
> measurement specialties parts are either pressure sensors or humidty
> sensors at least in terms of what they share interfaces with)
>=20
> Also, please cc the hwmon maintainers (and probably list) as we want thei=
r
> agreement.
>=20
> Jonathan
> --
> To unsubscribe from this list: send the line "unsubscribe linux-iio" in t=
he body
> of a message to majordomo@vger.kernel.org More majordomo info at
> http://vger.kernel.org/majordomo-info.html

RE: [PATCH 0/2] Add support for MAX31722/MAX31723 temperature sensors

[Breana, Tiberiu A]

Forwarding to the proper list address.=0A=
________________________________________=0A=
From: linux-iio-owner@vger.kernel.org [linux-iio-owner@vger.kernel.org] on =
behalf of Breana, Tiberiu A [tiberiu.a.breana@intel.com]=0A=
Sent: Tuesday, March 15, 2016 2:58 PM=0A=
To: linux@roeck-us.net; lm-sensors@vger.kernel.org=0A=
Cc: Jonathan Cameron; linux-iio@vger.kernel.org; Baluta, Daniel=0A=
Subject: RE: [PATCH 0/2] Add support for MAX31722/MAX31723 temperature sens=
ors=0A=
=0A=
Hello Guenter, hwmon,=0A=
=0A=
We have a dilemma as to wether this device driver belongs in IIO or hwmon:=
=0A=
https://datasheets.maximintegrated.com/en/ds/MAX31722-MAX31723.pdf=0A=
=0A=
Could you please give us your opinion on this?=0A=
Thanks,=0A=
=0A=
Tiberiu=0A=
=0A=
> -----Original Message-----=0A=
> From: linux-iio-owner@vger.kernel.org [mailto:linux-iio-=0A=
> owner@vger.kernel.org] On Behalf Of Jonathan Cameron=0A=
> Sent: Wednesday, March 9, 2016 10:32 PM=0A=
> To: Breana, Tiberiu A <tiberiu.a.breana@intel.com>; linux-=0A=
> iio@vger.kernel.org=0A=
> Subject: Re: [PATCH 0/2] Add support for MAX31722/MAX31723=0A=
> temperature sensors=0A=
>=0A=
> On 09/03/16 13:30, Tiberiu Breana wrote:=0A=
> > This patch set adds support for the MAX31722/MAX31723 temperature=0A=
> > sensors / thermostats.=0A=
> > Patch 1 adds basic support and power management.=0A=
> > Patch 2 adds threshold interrupt support.=0A=
> >=0A=
> > Tiberiu Breana (2):=0A=
> >   iio: temperature: Add support for MAX31722/MAX31723 temperature=0A=
> >     sensors=0A=
> >   iio: temperature: Add threshold interrupt support for max31722=0A=
> >=0A=
> >  drivers/iio/temperature/Kconfig    |  12 +=0A=
> >  drivers/iio/temperature/Makefile   |   1 +=0A=
> >  drivers/iio/temperature/max31722.c | 673=0A=
> > +++++++++++++++++++++++++++++++++++++=0A=
> >  3 files changed, 686 insertions(+)=0A=
> >  create mode 100644 drivers/iio/temperature/max31722.c=0A=
> >=0A=
> Hi Tiberiu,=0A=
>=0A=
> When proposing a temperature sensor driver, we need some additional=0A=
> justification for why it is suited for IIO rather than the more focused (=
and in=0A=
> someways simpler) hwmon.=0A=
>=0A=
> So far we have had thermophiles that don't fit in as devices typically us=
ed for=0A=
> hardware monitoring. Also in there are a few drivers which are for parts=
=0A=
> where they are a cut down version of a more complex sensor (the=0A=
> measurement specialties parts are either pressure sensors or humidty=0A=
> sensors at least in terms of what they share interfaces with)=0A=
>=0A=
> Also, please cc the hwmon maintainers (and probably list) as we want thei=
r=0A=
> agreement.=0A=
>=0A=
> Jonathan=0A=
> --=0A=
> To unsubscribe from this list: send the line "unsubscribe linux-iio" in t=
he body=0A=
> of a message to majordomo@vger.kernel.org More majordomo info at=0A=
> http://vger.kernel.org/majordomo-info.html=0A=
--=0A=
To unsubscribe from this list: send the line "unsubscribe linux-iio" in=0A=
the body of a message to majordomo@vger.kernel.org=0A=
More majordomo info at  http://vger.kernel.org/majordomo-info.html=0A=

Re: [lm-sensors] [PATCH 0/2] Add support for MAX31722/MAX31723 temperature sensors

[Breana, Tiberiu A]

Forwarding to the proper list address.
________________________________________
From: linux-iio-owner@vger.kernel.org [linux-iio-owner@vger.kernel.org] on behalf of Breana, Tiberiu A [tiberiu.a.breana@intel.com]
Sent: Tuesday, March 15, 2016 2:58 PM
To: linux@roeck-us.net; lm-sensors@vger.kernel.org
Cc: Jonathan Cameron; linux-iio@vger.kernel.org; Baluta, Daniel
Subject: RE: [PATCH 0/2] Add support for MAX31722/MAX31723 temperature sensors

Hello Guenter, hwmon,

We have a dilemma as to wether this device driver belongs in IIO or hwmon:
https://datasheets.maximintegrated.com/en/ds/MAX31722-MAX31723.pdf

Could you please give us your opinion on this?
Thanks,

Tiberiu

> -----Original Message-----
> From: linux-iio-owner@vger.kernel.org [mailto:linux-iio-
> owner@vger.kernel.org] On Behalf Of Jonathan Cameron
> Sent: Wednesday, March 9, 2016 10:32 PM
> To: Breana, Tiberiu A <tiberiu.a.breana@intel.com>; linux-
> iio@vger.kernel.org
> Subject: Re: [PATCH 0/2] Add support for MAX31722/MAX31723
> temperature sensors
>
> On 09/03/16 13:30, Tiberiu Breana wrote:
> > This patch set adds support for the MAX31722/MAX31723 temperature
> > sensors / thermostats.
> > Patch 1 adds basic support and power management.
> > Patch 2 adds threshold interrupt support.
> >
> > Tiberiu Breana (2):
> >   iio: temperature: Add support for MAX31722/MAX31723 temperature
> >     sensors
> >   iio: temperature: Add threshold interrupt support for max31722
> >
> >  drivers/iio/temperature/Kconfig    |  12 +
> >  drivers/iio/temperature/Makefile   |   1 +
> >  drivers/iio/temperature/max31722.c | 673
> > +++++++++++++++++++++++++++++++++++++
> >  3 files changed, 686 insertions(+)
> >  create mode 100644 drivers/iio/temperature/max31722.c
> >
> Hi Tiberiu,
>
> When proposing a temperature sensor driver, we need some additional
> justification for why it is suited for IIO rather than the more focused (and in
> someways simpler) hwmon.
>
> So far we have had thermophiles that don't fit in as devices typically used for
> hardware monitoring. Also in there are a few drivers which are for parts
> where they are a cut down version of a more complex sensor (the
> measurement specialties parts are either pressure sensors or humidty
> sensors at least in terms of what they share interfaces with)
>
> Also, please cc the hwmon maintainers (and probably list) as we want their
> agreement.
>
> Jonathan
> --
> To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body
> of a message to majordomo@vger.kernel.org More majordomo info at
> http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe linux-iio" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

_______________________________________________
lm-sensors mailing list
lm-sensors@lm-sensors.org
http://lists.lm-sensors.org/mailman/listinfo/lm-sensors

[lm-sensors] [PATCH 0/2] Add support for MAX31722/MAX31723 temperature sensors

[Tiberiu Breana]

This patch set adds support for the MAX31722/MAX31723 temperature sensors /
thermostats.
Patch 1 adds basic support and power management.
Patch 2 adds alarm support.

A discussion of whether this belongs in hwmon vs iio can be found here:
http://www.spinics.net/lists/linux-iio/msg23463.html

Tiberiu Breana (2):
  hwmon: (max31722) Add support for MAX31722/MAX31723 temperature
    sensors
  hwmon: (max31722) Add alarm support

 Documentation/hwmon/max31722 |  41 +++++
 drivers/hwmon/Kconfig        |  11 ++
 drivers/hwmon/Makefile       |   1 +
 drivers/hwmon/max31722.c     | 422 +++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 475 insertions(+)
 create mode 100644 Documentation/hwmon/max31722
 create mode 100644 drivers/hwmon/max31722.c

-- 
1.9.1


_______________________________________________
lm-sensors mailing list
lm-sensors@lm-sensors.org
http://lists.lm-sensors.org/mailman/listinfo/lm-sensors

Re: [PATCH 0/2] Add support for MAX31722/MAX31723 temperature sensors

[Guenter Roeck]

On 03/15/2016 05:58 AM, Breana, Tiberiu A wrote:
> Hello Guenter, hwmon,
>
> We have a dilemma as to wether this device driver belongs in IIO or hwmon:
> https://datasheets.maximintegrated.com/en/ds/MAX31722-MAX31723.pdf
>
> Could you please give us your opinion on this?

The chip has limit registers and an alarm signal output, suggesting that
its intended use is for hardware monitoring purposes.

The conversion time is between 50ms and 200ms, which suggests that the
faster ABI provided by iio isn't really beneficial.

Given all that, I think that hwmon would be a better place.

If you want to keep the driver in iio, I would suggest to consider enhancing
the iio-hwmon bridge with threshold/limit support if that is possible.
This would ensure that the chip can be used for its intended purpose.

Thanks,
Guenter

> Thanks,
>
> Tiberiu
>
>> -----Original Message-----
>> From: linux-iio-owner@vger.kernel.org [mailto:linux-iio-
>> owner@vger.kernel.org] On Behalf Of Jonathan Cameron
>> Sent: Wednesday, March 9, 2016 10:32 PM
>> To: Breana, Tiberiu A <tiberiu.a.breana@intel.com>; linux-
>> iio@vger.kernel.org
>> Subject: Re: [PATCH 0/2] Add support for MAX31722/MAX31723
>> temperature sensors
>>
>> On 09/03/16 13:30, Tiberiu Breana wrote:
>>> This patch set adds support for the MAX31722/MAX31723 temperature
>>> sensors / thermostats.
>>> Patch 1 adds basic support and power management.
>>> Patch 2 adds threshold interrupt support.
>>>
>>> Tiberiu Breana (2):
>>>    iio: temperature: Add support for MAX31722/MAX31723 temperature
>>>      sensors
>>>    iio: temperature: Add threshold interrupt support for max31722
>>>
>>>   drivers/iio/temperature/Kconfig    |  12 +
>>>   drivers/iio/temperature/Makefile   |   1 +
>>>   drivers/iio/temperature/max31722.c | 673
>>> +++++++++++++++++++++++++++++++++++++
>>>   3 files changed, 686 insertions(+)
>>>   create mode 100644 drivers/iio/temperature/max31722.c
>>>
>> Hi Tiberiu,
>>
>> When proposing a temperature sensor driver, we need some additional
>> justification for why it is suited for IIO rather than the more focused (and in
>> someways simpler) hwmon.
>>
>> So far we have had thermophiles that don't fit in as devices typically used for
>> hardware monitoring. Also in there are a few drivers which are for parts
>> where they are a cut down version of a more complex sensor (the
>> measurement specialties parts are either pressure sensors or humidty
>> sensors at least in terms of what they share interfaces with)
>>
>> Also, please cc the hwmon maintainers (and probably list) as we want their
>> agreement.
>>
>> Jonathan
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body
>> of a message to majordomo@vger.kernel.org More majordomo info at
>> http://vger.kernel.org/majordomo-info.html
>

Re: [lm-sensors] [PATCH 0/2] Add support for MAX31722/MAX31723 temperature sensors

[Guenter Roeck]

On 03/15/2016 05:58 AM, Breana, Tiberiu A wrote:
> Hello Guenter, hwmon,
>
> We have a dilemma as to wether this device driver belongs in IIO or hwmon:
> https://datasheets.maximintegrated.com/en/ds/MAX31722-MAX31723.pdf
>
> Could you please give us your opinion on this?

The chip has limit registers and an alarm signal output, suggesting that
its intended use is for hardware monitoring purposes.

The conversion time is between 50ms and 200ms, which suggests that the
faster ABI provided by iio isn't really beneficial.

Given all that, I think that hwmon would be a better place.

If you want to keep the driver in iio, I would suggest to consider enhancing
the iio-hwmon bridge with threshold/limit support if that is possible.
This would ensure that the chip can be used for its intended purpose.

Thanks,
Guenter

> Thanks,
>
> Tiberiu
>
>> -----Original Message-----
>> From: linux-iio-owner@vger.kernel.org [mailto:linux-iio-
>> owner@vger.kernel.org] On Behalf Of Jonathan Cameron
>> Sent: Wednesday, March 9, 2016 10:32 PM
>> To: Breana, Tiberiu A <tiberiu.a.breana@intel.com>; linux-
>> iio@vger.kernel.org
>> Subject: Re: [PATCH 0/2] Add support for MAX31722/MAX31723
>> temperature sensors
>>
>> On 09/03/16 13:30, Tiberiu Breana wrote:
>>> This patch set adds support for the MAX31722/MAX31723 temperature
>>> sensors / thermostats.
>>> Patch 1 adds basic support and power management.
>>> Patch 2 adds threshold interrupt support.
>>>
>>> Tiberiu Breana (2):
>>>    iio: temperature: Add support for MAX31722/MAX31723 temperature
>>>      sensors
>>>    iio: temperature: Add threshold interrupt support for max31722
>>>
>>>   drivers/iio/temperature/Kconfig    |  12 +
>>>   drivers/iio/temperature/Makefile   |   1 +
>>>   drivers/iio/temperature/max31722.c | 673
>>> +++++++++++++++++++++++++++++++++++++
>>>   3 files changed, 686 insertions(+)
>>>   create mode 100644 drivers/iio/temperature/max31722.c
>>>
>> Hi Tiberiu,
>>
>> When proposing a temperature sensor driver, we need some additional
>> justification for why it is suited for IIO rather than the more focused (and in
>> someways simpler) hwmon.
>>
>> So far we have had thermophiles that don't fit in as devices typically used for
>> hardware monitoring. Also in there are a few drivers which are for parts
>> where they are a cut down version of a more complex sensor (the
>> measurement specialties parts are either pressure sensors or humidty
>> sensors at least in terms of what they share interfaces with)
>>
>> Also, please cc the hwmon maintainers (and probably list) as we want their
>> agreement.
>>
>> Jonathan
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body
>> of a message to majordomo@vger.kernel.org More majordomo info at
>> http://vger.kernel.org/majordomo-info.html
>


_______________________________________________
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lm-sensors@lm-sensors.org
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Re: [PATCH 0/2] Add support for MAX31722/MAX31723 temperature sensors

[Jonathan Cameron]

On 15 March 2016 13:34:25 GMT+00:00, Guenter Roeck <linux@roeck-us.net> wrote:
>On 03/15/2016 05:58 AM, Breana, Tiberiu A wrote:
>> Hello Guenter, hwmon,
>>
>> We have a dilemma as to wether this device driver belongs in IIO or
>hwmon:
>> https://datasheets.maximintegrated.com/en/ds/MAX31722-MAX31723.pdf
>>
>> Could you please give us your opinion on this?
>
>The chip has limit registers and an alarm signal output, suggesting
>that
>its intended use is for hardware monitoring purposes.
>
>The conversion time is between 50ms and 200ms, which suggests that the
>faster ABI provided by iio isn't really beneficial.
>
>Given all that, I think that hwmon would be a better place.
Agreed.
>
>If you want to keep the driver in iio, I would suggest to consider
>enhancing
>the iio-hwmon bridge with threshold/limit support if that is possible.

Possible but non trivial as no one has yet implemented the core support for allowing
in kernel consumers to get events. It has been on the to-do list as a blocker of iio
 on IIO (which is really about reaching the point where the IIO userspace front end is
an optional nonspecial case consumer of
 IIO backends). Would be excellent to have this but may not be that straight forward.

Jonathan
>This would ensure that the chip can be used for its intended purpose.
>
>Thanks,
>Guenter
>
>> Thanks,
>>
>> Tiberiu
>>
>>> -----Original Message-----
>>> From: linux-iio-owner@vger.kernel.org [mailto:linux-iio-
>>> owner@vger.kernel.org] On Behalf Of Jonathan Cameron
>>> Sent: Wednesday, March 9, 2016 10:32 PM
>>> To: Breana, Tiberiu A <tiberiu.a.breana@intel.com>; linux-
>>> iio@vger.kernel.org
>>> Subject: Re: [PATCH 0/2] Add support for MAX31722/MAX31723
>>> temperature sensors
>>>
>>> On 09/03/16 13:30, Tiberiu Breana wrote:
>>>> This patch set adds support for the MAX31722/MAX31723 temperature
>>>> sensors / thermostats.
>>>> Patch 1 adds basic support and power management.
>>>> Patch 2 adds threshold interrupt support.
>>>>
>>>> Tiberiu Breana (2):
>>>>    iio: temperature: Add support for MAX31722/MAX31723 temperature
>>>>      sensors
>>>>    iio: temperature: Add threshold interrupt support for max31722
>>>>
>>>>   drivers/iio/temperature/Kconfig    |  12 +
>>>>   drivers/iio/temperature/Makefile   |   1 +
>>>>   drivers/iio/temperature/max31722.c | 673
>>>> +++++++++++++++++++++++++++++++++++++
>>>>   3 files changed, 686 insertions(+)
>>>>   create mode 100644 drivers/iio/temperature/max31722.c
>>>>
>>> Hi Tiberiu,
>>>
>>> When proposing a temperature sensor driver, we need some additional
>>> justification for why it is suited for IIO rather than the more
>focused (and in
>>> someways simpler) hwmon.
>>>
>>> So far we have had thermophiles that don't fit in as devices
>typically used for
>>> hardware monitoring. Also in there are a few drivers which are for
>parts
>>> where they are a cut down version of a more complex sensor (the
>>> measurement specialties parts are either pressure sensors or humidty
>>> sensors at least in terms of what they share interfaces with)
>>>
>>> Also, please cc the hwmon maintainers (and probably list) as we want
>their
>>> agreement.
>>>
>>> Jonathan
>>> --
>>> To unsubscribe from this list: send the line "unsubscribe linux-iio"
>in the body
>>> of a message to majordomo@vger.kernel.org More majordomo info at
>>> http://vger.kernel.org/majordomo-info.html
>>
>
>--
>To unsubscribe from this list: send the line "unsubscribe linux-iio" in
>the body of a message to majordomo@vger.kernel.org
>More majordomo info at  http://vger.kernel.org/majordomo-info.html

-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.

Re: [lm-sensors] [PATCH 0/2] Add support for MAX31722/MAX31723 temperature sensors

[Jonathan Cameron]

On 15 March 2016 13:34:25 GMT+00:00, Guenter Roeck <linux@roeck-us.net> wrote:
>On 03/15/2016 05:58 AM, Breana, Tiberiu A wrote:
>> Hello Guenter, hwmon,
>>
>> We have a dilemma as to wether this device driver belongs in IIO or
>hwmon:
>> https://datasheets.maximintegrated.com/en/ds/MAX31722-MAX31723.pdf
>>
>> Could you please give us your opinion on this?
>
>The chip has limit registers and an alarm signal output, suggesting
>that
>its intended use is for hardware monitoring purposes.
>
>The conversion time is between 50ms and 200ms, which suggests that the
>faster ABI provided by iio isn't really beneficial.
>
>Given all that, I think that hwmon would be a better place.
Agreed.
>
>If you want to keep the driver in iio, I would suggest to consider
>enhancing
>the iio-hwmon bridge with threshold/limit support if that is possible.

Possible but non trivial as no one has yet implemented the core support for allowing
in kernel consumers to get events. It has been on the to-do list as a blocker of iio
 on IIO (which is really about reaching the point where the IIO userspace front end is
an optional nonspecial case consumer of
 IIO backends). Would be excellent to have this but may not be that straight forward.

Jonathan
>This would ensure that the chip can be used for its intended purpose.
>
>Thanks,
>Guenter
>
>> Thanks,
>>
>> Tiberiu
>>
>>> -----Original Message-----
>>> From: linux-iio-owner@vger.kernel.org [mailto:linux-iio-
>>> owner@vger.kernel.org] On Behalf Of Jonathan Cameron
>>> Sent: Wednesday, March 9, 2016 10:32 PM
>>> To: Breana, Tiberiu A <tiberiu.a.breana@intel.com>; linux-
>>> iio@vger.kernel.org
>>> Subject: Re: [PATCH 0/2] Add support for MAX31722/MAX31723
>>> temperature sensors
>>>
>>> On 09/03/16 13:30, Tiberiu Breana wrote:
>>>> This patch set adds support for the MAX31722/MAX31723 temperature
>>>> sensors / thermostats.
>>>> Patch 1 adds basic support and power management.
>>>> Patch 2 adds threshold interrupt support.
>>>>
>>>> Tiberiu Breana (2):
>>>>    iio: temperature: Add support for MAX31722/MAX31723 temperature
>>>>      sensors
>>>>    iio: temperature: Add threshold interrupt support for max31722
>>>>
>>>>   drivers/iio/temperature/Kconfig    |  12 +
>>>>   drivers/iio/temperature/Makefile   |   1 +
>>>>   drivers/iio/temperature/max31722.c | 673
>>>> +++++++++++++++++++++++++++++++++++++
>>>>   3 files changed, 686 insertions(+)
>>>>   create mode 100644 drivers/iio/temperature/max31722.c
>>>>
>>> Hi Tiberiu,
>>>
>>> When proposing a temperature sensor driver, we need some additional
>>> justification for why it is suited for IIO rather than the more
>focused (and in
>>> someways simpler) hwmon.
>>>
>>> So far we have had thermophiles that don't fit in as devices
>typically used for
>>> hardware monitoring. Also in there are a few drivers which are for
>parts
>>> where they are a cut down version of a more complex sensor (the
>>> measurement specialties parts are either pressure sensors or humidty
>>> sensors at least in terms of what they share interfaces with)
>>>
>>> Also, please cc the hwmon maintainers (and probably list) as we want
>their
>>> agreement.
>>>
>>> Jonathan
>>> --
>>> To unsubscribe from this list: send the line "unsubscribe linux-iio"
>in the body
>>> of a message to majordomo@vger.kernel.org More majordomo info at
>>> http://vger.kernel.org/majordomo-info.html
>>
>
>--
>To unsubscribe from this list: send the line "unsubscribe linux-iio" in
>the body of a message to majordomo@vger.kernel.org
>More majordomo info at  http://vger.kernel.org/majordomo-info.html

-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.

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Re: [PATCH 0/2] Add support for MAX31722/MAX31723 temperature sensors

[Guenter Roeck]

On Tue, Mar 15, 2016 at 05:28:58PM +0000, Jonathan Cameron wrote:
> 
> 
> On 15 March 2016 13:34:25 GMT+00:00, Guenter Roeck <linux@roeck-us.net> wrote:
> >On 03/15/2016 05:58 AM, Breana, Tiberiu A wrote:
> >> Hello Guenter, hwmon,
> >>
> >> We have a dilemma as to wether this device driver belongs in IIO or
> >hwmon:
> >> https://datasheets.maximintegrated.com/en/ds/MAX31722-MAX31723.pdf
> >>
> >> Could you please give us your opinion on this?
> >
> >The chip has limit registers and an alarm signal output, suggesting
> >that
> >its intended use is for hardware monitoring purposes.
> >
> >The conversion time is between 50ms and 200ms, which suggests that the
> >faster ABI provided by iio isn't really beneficial.
> >
> >Given all that, I think that hwmon would be a better place.
> Agreed.
> >
> >If you want to keep the driver in iio, I would suggest to consider
> >enhancing
> >the iio-hwmon bridge with threshold/limit support if that is possible.
> 
> Possible but non trivial as no one has yet implemented the core support for allowing
> in kernel consumers to get events. It has been on the to-do list as a blocker of iio
>  on IIO (which is really about reaching the point where the IIO userspace front end is
> an optional nonspecial case consumer of
>  IIO backends). Would be excellent to have this but may not be that straight forward.
> 
I concluded that much as well after looking into it a bit more. Not just event
handling, but the ability to set and get thresholds is missing from the kernel API
as well. Yes, this will need some work. It would be useful, though, for other
drivers such as max1363. If it ever gets done, please let me know, and I'll see
if I can help testing it.

Guenter

> Jonathan
> >This would ensure that the chip can be used for its intended purpose.
> >
> >Thanks,
> >Guenter
> >
> >> Thanks,
> >>
> >> Tiberiu
> >>
> >>> -----Original Message-----
> >>> From: linux-iio-owner@vger.kernel.org [mailto:linux-iio-
> >>> owner@vger.kernel.org] On Behalf Of Jonathan Cameron
> >>> Sent: Wednesday, March 9, 2016 10:32 PM
> >>> To: Breana, Tiberiu A <tiberiu.a.breana@intel.com>; linux-
> >>> iio@vger.kernel.org
> >>> Subject: Re: [PATCH 0/2] Add support for MAX31722/MAX31723
> >>> temperature sensors
> >>>
> >>> On 09/03/16 13:30, Tiberiu Breana wrote:
> >>>> This patch set adds support for the MAX31722/MAX31723 temperature
> >>>> sensors / thermostats.
> >>>> Patch 1 adds basic support and power management.
> >>>> Patch 2 adds threshold interrupt support.
> >>>>
> >>>> Tiberiu Breana (2):
> >>>>    iio: temperature: Add support for MAX31722/MAX31723 temperature
> >>>>      sensors
> >>>>    iio: temperature: Add threshold interrupt support for max31722
> >>>>
> >>>>   drivers/iio/temperature/Kconfig    |  12 +
> >>>>   drivers/iio/temperature/Makefile   |   1 +
> >>>>   drivers/iio/temperature/max31722.c | 673
> >>>> +++++++++++++++++++++++++++++++++++++
> >>>>   3 files changed, 686 insertions(+)
> >>>>   create mode 100644 drivers/iio/temperature/max31722.c
> >>>>
> >>> Hi Tiberiu,
> >>>
> >>> When proposing a temperature sensor driver, we need some additional
> >>> justification for why it is suited for IIO rather than the more
> >focused (and in
> >>> someways simpler) hwmon.
> >>>
> >>> So far we have had thermophiles that don't fit in as devices
> >typically used for
> >>> hardware monitoring. Also in there are a few drivers which are for
> >parts
> >>> where they are a cut down version of a more complex sensor (the
> >>> measurement specialties parts are either pressure sensors or humidty
> >>> sensors at least in terms of what they share interfaces with)
> >>>
> >>> Also, please cc the hwmon maintainers (and probably list) as we want
> >their
> >>> agreement.
> >>>
> >>> Jonathan
> >>> --
> >>> To unsubscribe from this list: send the line "unsubscribe linux-iio"
> >in the body
> >>> of a message to majordomo@vger.kernel.org More majordomo info at
> >>> http://vger.kernel.org/majordomo-info.html
> >>
> >
> >--
> >To unsubscribe from this list: send the line "unsubscribe linux-iio" in
> >the body of a message to majordomo@vger.kernel.org
> >More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 
> -- 
> Sent from my Android device with K-9 Mail. Please excuse my brevity.

Re: [lm-sensors] [PATCH 0/2] Add support for MAX31722/MAX31723 temperature sensors

[Guenter Roeck]

On Tue, Mar 15, 2016 at 05:28:58PM +0000, Jonathan Cameron wrote:
> 
> 
> On 15 March 2016 13:34:25 GMT+00:00, Guenter Roeck <linux@roeck-us.net> wrote:
> >On 03/15/2016 05:58 AM, Breana, Tiberiu A wrote:
> >> Hello Guenter, hwmon,
> >>
> >> We have a dilemma as to wether this device driver belongs in IIO or
> >hwmon:
> >> https://datasheets.maximintegrated.com/en/ds/MAX31722-MAX31723.pdf
> >>
> >> Could you please give us your opinion on this?
> >
> >The chip has limit registers and an alarm signal output, suggesting
> >that
> >its intended use is for hardware monitoring purposes.
> >
> >The conversion time is between 50ms and 200ms, which suggests that the
> >faster ABI provided by iio isn't really beneficial.
> >
> >Given all that, I think that hwmon would be a better place.
> Agreed.
> >
> >If you want to keep the driver in iio, I would suggest to consider
> >enhancing
> >the iio-hwmon bridge with threshold/limit support if that is possible.
> 
> Possible but non trivial as no one has yet implemented the core support for allowing
> in kernel consumers to get events. It has been on the to-do list as a blocker of iio
>  on IIO (which is really about reaching the point where the IIO userspace front end is
> an optional nonspecial case consumer of
>  IIO backends). Would be excellent to have this but may not be that straight forward.
> 
I concluded that much as well after looking into it a bit more. Not just event
handling, but the ability to set and get thresholds is missing from the kernel API
as well. Yes, this will need some work. It would be useful, though, for other
drivers such as max1363. If it ever gets done, please let me know, and I'll see
if I can help testing it.

Guenter

> Jonathan
> >This would ensure that the chip can be used for its intended purpose.
> >
> >Thanks,
> >Guenter
> >
> >> Thanks,
> >>
> >> Tiberiu
> >>
> >>> -----Original Message-----
> >>> From: linux-iio-owner@vger.kernel.org [mailto:linux-iio-
> >>> owner@vger.kernel.org] On Behalf Of Jonathan Cameron
> >>> Sent: Wednesday, March 9, 2016 10:32 PM
> >>> To: Breana, Tiberiu A <tiberiu.a.breana@intel.com>; linux-
> >>> iio@vger.kernel.org
> >>> Subject: Re: [PATCH 0/2] Add support for MAX31722/MAX31723
> >>> temperature sensors
> >>>
> >>> On 09/03/16 13:30, Tiberiu Breana wrote:
> >>>> This patch set adds support for the MAX31722/MAX31723 temperature
> >>>> sensors / thermostats.
> >>>> Patch 1 adds basic support and power management.
> >>>> Patch 2 adds threshold interrupt support.
> >>>>
> >>>> Tiberiu Breana (2):
> >>>>    iio: temperature: Add support for MAX31722/MAX31723 temperature
> >>>>      sensors
> >>>>    iio: temperature: Add threshold interrupt support for max31722
> >>>>
> >>>>   drivers/iio/temperature/Kconfig    |  12 +
> >>>>   drivers/iio/temperature/Makefile   |   1 +
> >>>>   drivers/iio/temperature/max31722.c | 673
> >>>> +++++++++++++++++++++++++++++++++++++
> >>>>   3 files changed, 686 insertions(+)
> >>>>   create mode 100644 drivers/iio/temperature/max31722.c
> >>>>
> >>> Hi Tiberiu,
> >>>
> >>> When proposing a temperature sensor driver, we need some additional
> >>> justification for why it is suited for IIO rather than the more
> >focused (and in
> >>> someways simpler) hwmon.
> >>>
> >>> So far we have had thermophiles that don't fit in as devices
> >typically used for
> >>> hardware monitoring. Also in there are a few drivers which are for
> >parts
> >>> where they are a cut down version of a more complex sensor (the
> >>> measurement specialties parts are either pressure sensors or humidty
> >>> sensors at least in terms of what they share interfaces with)
> >>>
> >>> Also, please cc the hwmon maintainers (and probably list) as we want
> >their
> >>> agreement.
> >>>
> >>> Jonathan
> >>> --
> >>> To unsubscribe from this list: send the line "unsubscribe linux-iio"
> >in the body
> >>> of a message to majordomo@vger.kernel.org More majordomo info at
> >>> http://vger.kernel.org/majordomo-info.html
> >>
> >
> >--
> >To unsubscribe from this list: send the line "unsubscribe linux-iio" in
> >the body of a message to majordomo@vger.kernel.org
> >More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 
> -- 
> Sent from my Android device with K-9 Mail. Please excuse my brevity.

_______________________________________________
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lm-sensors@lm-sensors.org
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RE: [PATCH 0/2] Add support for MAX31722/MAX31723 temperature sensors

[Breana, Tiberiu A]

> -----Original Message-----
> From: linux-iio-owner@vger.kernel.org [mailto:linux-iio-
> owner@vger.kernel.org] On Behalf Of Guenter Roeck
> Sent: Tuesday, March 15, 2016 8:30 PM
> To: Jonathan Cameron <jic23@jic23.retrosnub.co.uk>
> Cc: Breana, Tiberiu A <tiberiu.a.breana@intel.com>; LM Sensors <lm-
> sensors@lm-sensors.org>; Jonathan Cameron <jic23@kernel.org>; linux-
> iio@vger.kernel.org; Baluta, Daniel <daniel.baluta@intel.com>
> Subject: Re: [PATCH 0/2] Add support for MAX31722/MAX31723
> temperature sensors
>=20
> On Tue, Mar 15, 2016 at 05:28:58PM +0000, Jonathan Cameron wrote:
> >
> >
> > On 15 March 2016 13:34:25 GMT+00:00, Guenter Roeck <linux@roeck-
> us.net> wrote:
> > >On 03/15/2016 05:58 AM, Breana, Tiberiu A wrote:
> > >> Hello Guenter, hwmon,
> > >>
> > >> We have a dilemma as to wether this device driver belongs in IIO or
> > >hwmon:
> > >> https://datasheets.maximintegrated.com/en/ds/MAX31722-
> MAX31723.pdf
> > >>
> > >> Could you please give us your opinion on this?
> > >
> > >The chip has limit registers and an alarm signal output, suggesting
> > >that its intended use is for hardware monitoring purposes.
> > >
> > >The conversion time is between 50ms and 200ms, which suggests that
> > >the faster ABI provided by iio isn't really beneficial.
> > >
> > >Given all that, I think that hwmon would be a better place.
> > Agreed.
> > >
> > >If you want to keep the driver in iio, I would suggest to consider
> > >enhancing the iio-hwmon bridge with threshold/limit support if that
> > >is possible.
> >
> > Possible but non trivial as no one has yet implemented the core
> > support for allowing in kernel consumers to get events. It has been on
> > the to-do list as a blocker of iio  on IIO (which is really about
> > reaching the point where the IIO userspace front end is an optional
> > nonspecial case consumer of  IIO backends). Would be excellent to have
> this but may not be that straight forward.
> >
> I concluded that much as well after looking into it a bit more. Not just =
event
> handling, but the ability to set and get thresholds is missing from the k=
ernel
> API as well. Yes, this will need some work. It would be useful, though, f=
or
> other drivers such as max1363. If it ever gets done, please let me know, =
and
> I'll see if I can help testing it.
>=20
> Guenter

Thanks for your insight on this. I'll rewrite the driver for hwmon.

Tiberiu

>=20
> > Jonathan
> > >This would ensure that the chip can be used for its intended purpose.
> > >
> > >Thanks,
> > >Guenter
> > >
> > >> Thanks,
> > >>
> > >> Tiberiu
> > >>
> > >>> -----Original Message-----
> > >>> From: linux-iio-owner@vger.kernel.org [mailto:linux-iio-
> > >>> owner@vger.kernel.org] On Behalf Of Jonathan Cameron
> > >>> Sent: Wednesday, March 9, 2016 10:32 PM
> > >>> To: Breana, Tiberiu A <tiberiu.a.breana@intel.com>; linux-
> > >>> iio@vger.kernel.org
> > >>> Subject: Re: [PATCH 0/2] Add support for MAX31722/MAX31723
> > >>> temperature sensors
> > >>>
> > >>> On 09/03/16 13:30, Tiberiu Breana wrote:
> > >>>> This patch set adds support for the MAX31722/MAX31723
> temperature
> > >>>> sensors / thermostats.
> > >>>> Patch 1 adds basic support and power management.
> > >>>> Patch 2 adds threshold interrupt support.
> > >>>>
> > >>>> Tiberiu Breana (2):
> > >>>>    iio: temperature: Add support for MAX31722/MAX31723
> temperature
> > >>>>      sensors
> > >>>>    iio: temperature: Add threshold interrupt support for max31722
> > >>>>
> > >>>>   drivers/iio/temperature/Kconfig    |  12 +
> > >>>>   drivers/iio/temperature/Makefile   |   1 +
> > >>>>   drivers/iio/temperature/max31722.c | 673
> > >>>> +++++++++++++++++++++++++++++++++++++
> > >>>>   3 files changed, 686 insertions(+)
> > >>>>   create mode 100644 drivers/iio/temperature/max31722.c
> > >>>>
> > >>> Hi Tiberiu,
> > >>>
> > >>> When proposing a temperature sensor driver, we need some
> > >>> additional justification for why it is suited for IIO rather than
> > >>> the more
> > >focused (and in
> > >>> someways simpler) hwmon.
> > >>>
> > >>> So far we have had thermophiles that don't fit in as devices
> > >typically used for
> > >>> hardware monitoring. Also in there are a few drivers which are for
> > >parts
> > >>> where they are a cut down version of a more complex sensor (the
> > >>> measurement specialties parts are either pressure sensors or
> > >>> humidty sensors at least in terms of what they share interfaces
> > >>> with)
> > >>>
> > >>> Also, please cc the hwmon maintainers (and probably list) as we
> > >>> want
> > >their
> > >>> agreement.
> > >>>
> > >>> Jonathan
> > >>> --
> > >>> To unsubscribe from this list: send the line "unsubscribe linux-iio=
"
> > >in the body
> > >>> of a message to majordomo@vger.kernel.org More majordomo info at
> > >>> http://vger.kernel.org/majordomo-info.html
> > >>
> > >
> > >--
> > >To unsubscribe from this list: send the line "unsubscribe linux-iio"
> > >in the body of a message to majordomo@vger.kernel.org More
> majordomo
> > >info at  http://vger.kernel.org/majordomo-info.html
> >
> > --
> > Sent from my Android device with K-9 Mail. Please excuse my brevity.
> --
> To unsubscribe from this list: send the line "unsubscribe linux-iio" in t=
he body
> of a message to majordomo@vger.kernel.org More majordomo info at
> http://vger.kernel.org/majordomo-info.html

Re: [lm-sensors] [PATCH 0/2] Add support for MAX31722/MAX31723 temperature sensors

[Breana, Tiberiu A]

> -----Original Message-----
> From: linux-iio-owner@vger.kernel.org [mailto:linux-iio-
> owner@vger.kernel.org] On Behalf Of Guenter Roeck
> Sent: Tuesday, March 15, 2016 8:30 PM
> To: Jonathan Cameron <jic23@jic23.retrosnub.co.uk>
> Cc: Breana, Tiberiu A <tiberiu.a.breana@intel.com>; LM Sensors <lm-
> sensors@lm-sensors.org>; Jonathan Cameron <jic23@kernel.org>; linux-
> iio@vger.kernel.org; Baluta, Daniel <daniel.baluta@intel.com>
> Subject: Re: [PATCH 0/2] Add support for MAX31722/MAX31723
> temperature sensors
> 
> On Tue, Mar 15, 2016 at 05:28:58PM +0000, Jonathan Cameron wrote:
> >
> >
> > On 15 March 2016 13:34:25 GMT+00:00, Guenter Roeck <linux@roeck-
> us.net> wrote:
> > >On 03/15/2016 05:58 AM, Breana, Tiberiu A wrote:
> > >> Hello Guenter, hwmon,
> > >>
> > >> We have a dilemma as to wether this device driver belongs in IIO or
> > >hwmon:
> > >> https://datasheets.maximintegrated.com/en/ds/MAX31722-
> MAX31723.pdf
> > >>
> > >> Could you please give us your opinion on this?
> > >
> > >The chip has limit registers and an alarm signal output, suggesting
> > >that its intended use is for hardware monitoring purposes.
> > >
> > >The conversion time is between 50ms and 200ms, which suggests that
> > >the faster ABI provided by iio isn't really beneficial.
> > >
> > >Given all that, I think that hwmon would be a better place.
> > Agreed.
> > >
> > >If you want to keep the driver in iio, I would suggest to consider
> > >enhancing the iio-hwmon bridge with threshold/limit support if that
> > >is possible.
> >
> > Possible but non trivial as no one has yet implemented the core
> > support for allowing in kernel consumers to get events. It has been on
> > the to-do list as a blocker of iio  on IIO (which is really about
> > reaching the point where the IIO userspace front end is an optional
> > nonspecial case consumer of  IIO backends). Would be excellent to have
> this but may not be that straight forward.
> >
> I concluded that much as well after looking into it a bit more. Not just event
> handling, but the ability to set and get thresholds is missing from the kernel
> API as well. Yes, this will need some work. It would be useful, though, for
> other drivers such as max1363. If it ever gets done, please let me know, and
> I'll see if I can help testing it.
> 
> Guenter

Thanks for your insight on this. I'll rewrite the driver for hwmon.

Tiberiu

> 
> > Jonathan
> > >This would ensure that the chip can be used for its intended purpose.
> > >
> > >Thanks,
> > >Guenter
> > >
> > >> Thanks,
> > >>
> > >> Tiberiu
> > >>
> > >>> -----Original Message-----
> > >>> From: linux-iio-owner@vger.kernel.org [mailto:linux-iio-
> > >>> owner@vger.kernel.org] On Behalf Of Jonathan Cameron
> > >>> Sent: Wednesday, March 9, 2016 10:32 PM
> > >>> To: Breana, Tiberiu A <tiberiu.a.breana@intel.com>; linux-
> > >>> iio@vger.kernel.org
> > >>> Subject: Re: [PATCH 0/2] Add support for MAX31722/MAX31723
> > >>> temperature sensors
> > >>>
> > >>> On 09/03/16 13:30, Tiberiu Breana wrote:
> > >>>> This patch set adds support for the MAX31722/MAX31723
> temperature
> > >>>> sensors / thermostats.
> > >>>> Patch 1 adds basic support and power management.
> > >>>> Patch 2 adds threshold interrupt support.
> > >>>>
> > >>>> Tiberiu Breana (2):
> > >>>>    iio: temperature: Add support for MAX31722/MAX31723
> temperature
> > >>>>      sensors
> > >>>>    iio: temperature: Add threshold interrupt support for max31722
> > >>>>
> > >>>>   drivers/iio/temperature/Kconfig    |  12 +
> > >>>>   drivers/iio/temperature/Makefile   |   1 +
> > >>>>   drivers/iio/temperature/max31722.c | 673
> > >>>> +++++++++++++++++++++++++++++++++++++
> > >>>>   3 files changed, 686 insertions(+)
> > >>>>   create mode 100644 drivers/iio/temperature/max31722.c
> > >>>>
> > >>> Hi Tiberiu,
> > >>>
> > >>> When proposing a temperature sensor driver, we need some
> > >>> additional justification for why it is suited for IIO rather than
> > >>> the more
> > >focused (and in
> > >>> someways simpler) hwmon.
> > >>>
> > >>> So far we have had thermophiles that don't fit in as devices
> > >typically used for
> > >>> hardware monitoring. Also in there are a few drivers which are for
> > >parts
> > >>> where they are a cut down version of a more complex sensor (the
> > >>> measurement specialties parts are either pressure sensors or
> > >>> humidty sensors at least in terms of what they share interfaces
> > >>> with)
> > >>>
> > >>> Also, please cc the hwmon maintainers (and probably list) as we
> > >>> want
> > >their
> > >>> agreement.
> > >>>
> > >>> Jonathan
> > >>> --
> > >>> To unsubscribe from this list: send the line "unsubscribe linux-iio"
> > >in the body
> > >>> of a message to majordomo@vger.kernel.org More majordomo info at
> > >>> http://vger.kernel.org/majordomo-info.html
> > >>
> > >
> > >--
> > >To unsubscribe from this list: send the line "unsubscribe linux-iio"
> > >in the body of a message to majordomo@vger.kernel.org More
> majordomo
> > >info at  http://vger.kernel.org/majordomo-info.html
> >
> > --
> > Sent from my Android device with K-9 Mail. Please excuse my brevity.
> --
> To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body
> of a message to majordomo@vger.kernel.org More majordomo info at
> http://vger.kernel.org/majordomo-info.html

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