[PATCH v4 01/11] iio: light: cm32181: Switch to new style i2c-driver probe function

[PATCH v4 01/11] iio: light: cm32181: Switch to new style i2c-driver probe function

[Hans de Goede]

Switch to the new style i2c-driver probe_new probe function and drop the
unnecessary i2c_device_id table (we do not have any old style board files
using this).

This is a preparation patch for adding ACPI binding support.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Changes in v4:
- Set indio_dev->name to "cm32181" instead of setting it to dev_name(dev)

Changes in v3:
- This is a new patch in v3 of this patch-set
---
 drivers/iio/light/cm32181.c | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
index 5f4fb5674fa0..2c139d85ef0c 100644
--- a/drivers/iio/light/cm32181.c
+++ b/drivers/iio/light/cm32181.c
@@ -294,8 +294,7 @@ static const struct iio_info cm32181_info = {
 	.attrs			= &cm32181_attribute_group,
 };
 
-static int cm32181_probe(struct i2c_client *client,
-			const struct i2c_device_id *id)
+static int cm32181_probe(struct i2c_client *client)
 {
 	struct cm32181_chip *cm32181;
 	struct iio_dev *indio_dev;
@@ -316,7 +315,7 @@ static int cm32181_probe(struct i2c_client *client,
 	indio_dev->channels = cm32181_channels;
 	indio_dev->num_channels = ARRAY_SIZE(cm32181_channels);
 	indio_dev->info = &cm32181_info;
-	indio_dev->name = id->name;
+	indio_dev->name = "cm32181";
 	indio_dev->modes = INDIO_DIRECT_MODE;
 
 	ret = cm32181_reg_init(cm32181);
@@ -338,13 +337,6 @@ static int cm32181_probe(struct i2c_client *client,
 	return 0;
 }
 
-static const struct i2c_device_id cm32181_id[] = {
-	{ "cm32181", 0 },
-	{ }
-};
-
-MODULE_DEVICE_TABLE(i2c, cm32181_id);
-
 static const struct of_device_id cm32181_of_match[] = {
 	{ .compatible = "capella,cm32181" },
 	{ }
@@ -356,8 +348,7 @@ static struct i2c_driver cm32181_driver = {
 		.name	= "cm32181",
 		.of_match_table = of_match_ptr(cm32181_of_match),
 	},
-	.id_table       = cm32181_id,
-	.probe		= cm32181_probe,
+	.probe_new	= cm32181_probe,
 };
 
 module_i2c_driver(cm32181_driver);
-- 
2.26.0

[PATCH v4 02/11] iio: light: cm32181: Add support for ACPI enumeration

[Hans de Goede]

Add support for ACPI enumeration, this has been tested on a HP
HP Pavilion x2 Detachable 10 (Bay Trail model).

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Changes in v3:
- This is a new patch in v3 of this patch-set
---
 drivers/iio/light/cm32181.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
index 2c139d85ef0c..91f83f9b9ea3 100644
--- a/drivers/iio/light/cm32181.c
+++ b/drivers/iio/light/cm32181.c
@@ -343,9 +343,18 @@ static const struct of_device_id cm32181_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, cm32181_of_match);
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id cm32181_acpi_match[] = {
+	{ "CPLM3218", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, cm32181_acpi_match);
+#endif
+
 static struct i2c_driver cm32181_driver = {
 	.driver = {
 		.name	= "cm32181",
+		.acpi_match_table = ACPI_PTR(cm32181_acpi_match),
 		.of_match_table = of_match_ptr(cm32181_of_match),
 	},
 	.probe_new	= cm32181_probe,
-- 
2.26.0

[PATCH v4 03/11] iio: light: cm32181: Add some extra register defines

[Hans de Goede]

These come from a newer version of cm32181.c, which is floating around
the net, with a copyright of:

 * Copyright (C) 2014 Capella Microsystems Inc.
 * Author: Kevin Tsai <ktsai@capellamicro.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2, as published
 * by the Free Software Foundation.

Note that this removes the bogus CM32181_CMD_ALS_ENABLE define, there
is no enable bit, only a disable bit and enabled is the absence of
being disabled.

This is a preparation patch for adding support for the older
CM3218 model of the light sensor.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/iio/light/cm32181.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
index 91f83f9b9ea3..e7dc3276d800 100644
--- a/drivers/iio/light/cm32181.c
+++ b/drivers/iio/light/cm32181.c
@@ -18,6 +18,9 @@
 
 /* Registers Address */
 #define CM32181_REG_ADDR_CMD		0x00
+#define CM32181_REG_ADDR_WH		0x01
+#define CM32181_REG_ADDR_WL		0x02
+#define CM32181_REG_ADDR_TEST		0x03
 #define CM32181_REG_ADDR_ALS		0x04
 #define CM32181_REG_ADDR_STATUS		0x06
 #define CM32181_REG_ADDR_ID		0x07
@@ -26,9 +29,13 @@
 #define CM32181_CONF_REG_NUM		0x01
 
 /* CMD register */
-#define CM32181_CMD_ALS_ENABLE		0x00
-#define CM32181_CMD_ALS_DISABLE		0x01
-#define CM32181_CMD_ALS_INT_EN		0x02
+#define CM32181_CMD_ALS_DISABLE		BIT(0)
+#define CM32181_CMD_ALS_INT_EN		BIT(1)
+#define CM32181_CMD_ALS_THRES_WINDOW	BIT(2)
+
+#define CM32181_CMD_ALS_PERS_SHIFT	4
+#define CM32181_CMD_ALS_PERS_MASK	(0x03 << CM32181_CMD_ALS_PERS_SHIFT)
+#define CM32181_CMD_ALS_PERS_DEFAULT	(0x01 << CM32181_CMD_ALS_PERS_SHIFT)
 
 #define CM32181_CMD_ALS_IT_SHIFT	6
 #define CM32181_CMD_ALS_IT_MASK		(0x0F << CM32181_CMD_ALS_IT_SHIFT)
@@ -82,7 +89,7 @@ static int cm32181_reg_init(struct cm32181_chip *cm32181)
 		return -ENODEV;
 
 	/* Default Values */
-	cm32181->conf_regs[CM32181_REG_ADDR_CMD] = CM32181_CMD_ALS_ENABLE |
+	cm32181->conf_regs[CM32181_REG_ADDR_CMD] =
 			CM32181_CMD_ALS_IT_DEFAULT | CM32181_CMD_ALS_SM_DEFAULT;
 	cm32181->calibscale = CM32181_CALIBSCALE_DEFAULT;
 
-- 
2.26.0

[PATCH v4 04/11] iio: light: cm32181: Add support for the CM3218

[Hans de Goede]

Add support for the CM3218 which is an older version of the
CM32181.

This is based on a newer version of cm32181.c, with a copyright of:

 * Copyright (C) 2014 Capella Microsystems Inc.
 * Author: Kevin Tsai <ktsai@capellamicro.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2, as published
 * by the Free Software Foundation.

Which is floating around on the net in various places, but the changes
from this newer version never made it upstream.

This was tested on an Asus T100TA and an Asus T100CHI, which both come
with the CM3218 variant of the light sensor.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Changes in v4:
- Add a cm32181_chip_info structure and use that to store the various
  sensor-model specific values
---
 drivers/iio/light/cm32181.c | 67 ++++++++++++++++++++++++++++++-------
 1 file changed, 54 insertions(+), 13 deletions(-)

diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
index e7dc3276d800..92b9ce91fe0a 100644
--- a/drivers/iio/light/cm32181.c
+++ b/drivers/iio/light/cm32181.c
@@ -55,17 +55,45 @@ static const u8 cm32181_reg[CM32181_CONF_REG_NUM] = {
 	CM32181_REG_ADDR_CMD,
 };
 
-static const int als_it_bits[] = {12, 8, 0, 1, 2, 3};
-static const int als_it_value[] = {25000, 50000, 100000, 200000, 400000,
-	800000};
+struct cm32181_chip_info {
+	const char *name;
+	const int *als_it_bits;
+	const int *als_it_values;
+	int num_als_it;
+};
 
 struct cm32181_chip {
 	struct i2c_client *client;
+	const struct cm32181_chip_info *info;
 	struct mutex lock;
 	u16 conf_regs[CM32181_CONF_REG_NUM];
 	int calibscale;
 };
 
+/* CM3218 Family */
+static const int cm3218_als_it_bits[] = { 0, 1, 2, 3 };
+static const int cm3218_als_it_values[] = { 100000, 200000, 400000, 800000 };
+
+const struct cm32181_chip_info cm3218_chip_info = {
+	.name = "cm3218",
+	.als_it_bits = cm3218_als_it_bits,
+	.als_it_values = cm3218_als_it_values,
+	.num_als_it = ARRAY_SIZE(cm3218_als_it_bits),
+};
+
+/* CM32181 Family */
+static const int cm32181_als_it_bits[] = { 12, 8, 0, 1, 2, 3 };
+static const int cm32181_als_it_values[] = {
+	25000, 50000, 100000, 200000, 400000, 800000
+};
+
+const struct cm32181_chip_info cm32181_chip_info = {
+	.name = "cm32181",
+	.als_it_bits = cm32181_als_it_bits,
+	.als_it_values = cm32181_als_it_values,
+	.num_als_it = ARRAY_SIZE(cm32181_als_it_bits),
+};
+
 /**
  * cm32181_reg_init() - Initialize CM32181 registers
  * @cm32181:	pointer of struct cm32181.
@@ -85,8 +113,17 @@ static int cm32181_reg_init(struct cm32181_chip *cm32181)
 		return ret;
 
 	/* check device ID */
-	if ((ret & 0xFF) != 0x81)
+	switch (ret & 0xFF) {
+	case 0x18: /* CM3218 */
+		cm32181->info = &cm3218_chip_info;
+		break;
+	case 0x81: /* CM32181 */
+	case 0x82: /* CM32182, fully compat. with CM32181 */
+		cm32181->info = &cm32181_chip_info;
+		break;
+	default:
 		return -ENODEV;
+	}
 
 	/* Default Values */
 	cm32181->conf_regs[CM32181_REG_ADDR_CMD] =
@@ -121,9 +158,9 @@ static int cm32181_read_als_it(struct cm32181_chip *cm32181, int *val2)
 	als_it = cm32181->conf_regs[CM32181_REG_ADDR_CMD];
 	als_it &= CM32181_CMD_ALS_IT_MASK;
 	als_it >>= CM32181_CMD_ALS_IT_SHIFT;
-	for (i = 0; i < ARRAY_SIZE(als_it_bits); i++) {
-		if (als_it == als_it_bits[i]) {
-			*val2 = als_it_value[i];
+	for (i = 0; i < cm32181->info->num_als_it; i++) {
+		if (als_it == cm32181->info->als_it_bits[i]) {
+			*val2 = cm32181->info->als_it_values[i];
 			return IIO_VAL_INT_PLUS_MICRO;
 		}
 	}
@@ -146,14 +183,14 @@ static int cm32181_write_als_it(struct cm32181_chip *cm32181, int val)
 	u16 als_it;
 	int ret, i, n;
 
-	n = ARRAY_SIZE(als_it_value);
+	n = cm32181->info->num_als_it;
 	for (i = 0; i < n; i++)
-		if (val <= als_it_value[i])
+		if (val <= cm32181->info->als_it_values[i])
 			break;
 	if (i >= n)
 		i = n - 1;
 
-	als_it = als_it_bits[i];
+	als_it = cm32181->info->als_it_bits[i];
 	als_it <<= CM32181_CMD_ALS_IT_SHIFT;
 
 	mutex_lock(&cm32181->lock);
@@ -265,11 +302,13 @@ static int cm32181_write_raw(struct iio_dev *indio_dev,
 static ssize_t cm32181_get_it_available(struct device *dev,
 			struct device_attribute *attr, char *buf)
 {
+	struct cm32181_chip *cm32181 = iio_priv(dev_to_iio_dev(dev));
 	int i, n, len;
 
-	n = ARRAY_SIZE(als_it_value);
+	n = cm32181->info->num_als_it;
 	for (i = 0, len = 0; i < n; i++)
-		len += sprintf(buf + len, "0.%06u ", als_it_value[i]);
+		len += sprintf(buf + len, "0.%06u ",
+			       cm32181->info->als_it_values[i]);
 	return len + sprintf(buf + len, "\n");
 }
 
@@ -322,7 +361,6 @@ static int cm32181_probe(struct i2c_client *client)
 	indio_dev->channels = cm32181_channels;
 	indio_dev->num_channels = ARRAY_SIZE(cm32181_channels);
 	indio_dev->info = &cm32181_info;
-	indio_dev->name = "cm32181";
 	indio_dev->modes = INDIO_DIRECT_MODE;
 
 	ret = cm32181_reg_init(cm32181);
@@ -333,6 +371,8 @@ static int cm32181_probe(struct i2c_client *client)
 		return ret;
 	}
 
+	indio_dev->name = cm32181->info->name;
+
 	ret = devm_iio_device_register(&client->dev, indio_dev);
 	if (ret) {
 		dev_err(&client->dev,
@@ -345,6 +385,7 @@ static int cm32181_probe(struct i2c_client *client)
 }
 
 static const struct of_device_id cm32181_of_match[] = {
+	{ .compatible = "capella,cm3218" },
 	{ .compatible = "capella,cm32181" },
 	{ }
 };
-- 
2.26.0

[PATCH v4 05/11] iio: light: cm32181: Clean up the probe function a bit

[Hans de Goede]

3 small cleanups to cm32181_probe():

1. Do not log an error when we fail to allocate memory (as a general
rule drivers do not log errors for this as the kernel will already
have complained loudly that it could not alloc the mem).

2. Remove the i2c_set_clientdata() call, we never use i2c_get_clientdata()
or dev_get_drvdata() anywhere.

3. Add a dev helper variable and use it in various places instead of
&client->dev.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Changes in v3:
- This is a new patch in v3 of this patch-set
---
 drivers/iio/light/cm32181.c | 20 +++++++-------------
 1 file changed, 7 insertions(+), 13 deletions(-)

diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
index 92b9ce91fe0a..f6261798baa3 100644
--- a/drivers/iio/light/cm32181.c
+++ b/drivers/iio/light/cm32181.c
@@ -342,22 +342,20 @@ static const struct iio_info cm32181_info = {
 
 static int cm32181_probe(struct i2c_client *client)
 {
+	struct device *dev = &client->dev;
 	struct cm32181_chip *cm32181;
 	struct iio_dev *indio_dev;
 	int ret;
 
-	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*cm32181));
-	if (!indio_dev) {
-		dev_err(&client->dev, "devm_iio_device_alloc failed\n");
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*cm32181));
+	if (!indio_dev)
 		return -ENOMEM;
-	}
 
 	cm32181 = iio_priv(indio_dev);
-	i2c_set_clientdata(client, indio_dev);
 	cm32181->client = client;
 
 	mutex_init(&cm32181->lock);
-	indio_dev->dev.parent = &client->dev;
+	indio_dev->dev.parent = dev;
 	indio_dev->channels = cm32181_channels;
 	indio_dev->num_channels = ARRAY_SIZE(cm32181_channels);
 	indio_dev->info = &cm32181_info;
@@ -365,19 +363,15 @@ static int cm32181_probe(struct i2c_client *client)
 
 	ret = cm32181_reg_init(cm32181);
 	if (ret) {
-		dev_err(&client->dev,
-			"%s: register init failed\n",
-			__func__);
+		dev_err(dev, "%s: register init failed\n", __func__);
 		return ret;
 	}
 
 	indio_dev->name = cm32181->info->name;
 
-	ret = devm_iio_device_register(&client->dev, indio_dev);
+	ret = devm_iio_device_register(dev, indio_dev);
 	if (ret) {
-		dev_err(&client->dev,
-			"%s: regist device failed\n",
-			__func__);
+		dev_err(dev, "%s: regist device failed\n", __func__);
 		return ret;
 	}
 
-- 
2.26.0

[PATCH v4 06/11] iio: light: cm32181: Handle CM3218 ACPI devices with 2 I2C resources

[Hans de Goede]

Some ACPI systems list 2 I2C resources for the CM3218 sensor. On these
systems the first I2cSerialBus ACPI-resource points to the SMBus Alert
Response Address (ARA, 0x0c) and the second I2cSerialBus ACPI-resource
points to the actual CM3218 sensor address:

 Method (_CRS, 0, NotSerialized)  // _CRS: Current Resource Settings
 {
     Name (SBUF, ResourceTemplate ()
     {
         I2cSerialBusV2 (0x000C, ControllerInitiated, 0x00061A80,
             AddressingMode7Bit, "\\_SB.I2C3",
             0x00, ResourceConsumer, , Exclusive,
             )
         I2cSerialBusV2 (0x0048, ControllerInitiated, 0x00061A80,
             AddressingMode7Bit, "\\_SB.I2C3",
             0x00, ResourceConsumer, , Exclusive,
             )
         Interrupt (ResourceConsumer, Level, ActiveHigh, Exclusive, ,, )
         {
             0x00000033,
         }
     })
     Return (SBUF) /* \_SB_.I2C3.ALSD._CRS.SBUF */
 }

Detect this and take the following step to deal with it:

1. When a SMBus Alert capable sensor has an Alert asserted, it will
   not respond on its actual I2C address. Read a byte from the ARA
   to clear any pending Alerts.

2. Create a "dummy" client for the actual I2C address and
   use that client to communicate with the sensor.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Changes in v3:
- Create and use a dummy client instead of relying on i2c-multi-instantiate
  to create 2 separate clients for the 2 I2C resources

Changes in v2
- s/i2c_client-s/I2C clients/ in added comment
---
 drivers/iio/light/cm32181.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
index f6261798baa3..fd760e209dfa 100644
--- a/drivers/iio/light/cm32181.c
+++ b/drivers/iio/light/cm32181.c
@@ -51,6 +51,8 @@
 #define CM32181_CALIBSCALE_RESOLUTION	1000
 #define MLUX_PER_LUX			1000
 
+#define SMBUS_ALERT_RESPONSE_ADDRESS	0x0c
+
 static const u8 cm32181_reg[CM32181_CONF_REG_NUM] = {
 	CM32181_REG_ADDR_CMD,
 };
@@ -351,6 +353,26 @@ static int cm32181_probe(struct i2c_client *client)
 	if (!indio_dev)
 		return -ENOMEM;
 
+	/*
+	 * Some ACPI systems list 2 I2C resources for the CM3218 sensor, the
+	 * SMBus Alert Response Address (ARA, 0x0c) and the actual I2C address.
+	 * Detect this and take the following step to deal with it:
+	 * 1. When a SMBus Alert capable sensor has an Alert asserted, it will
+	 *    not respond on its actual I2C address. Read a byte from the ARA
+	 *    to clear any pending Alerts.
+	 * 2. Create a "dummy" client for the actual I2C address and
+	 *    use that client to communicate with the sensor.
+	 */
+	if (ACPI_HANDLE(dev) && client->addr == SMBUS_ALERT_RESPONSE_ADDRESS) {
+		struct i2c_board_info board_info = { .type = "dummy" };
+
+		i2c_smbus_read_byte(client);
+
+		client = i2c_acpi_new_device(dev, 1, &board_info);
+		if (IS_ERR(client))
+			return PTR_ERR(client);
+	}
+
 	cm32181 = iio_priv(indio_dev);
 	cm32181->client = client;
 
-- 
2.26.0

[PATCH v4 07/11] iio: light: cm32181: Change reg_init to use a bitmap of which registers to init

[Hans de Goede]

This is a preparation patch for reading some ACPI tables which give
init values for multiple registers.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Changes in v2:
- Use unsigned long for init_regs_bitmap
- Use for_each_set_bit()
---
 drivers/iio/light/cm32181.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
index fd760e209dfa..f5af986e1ed4 100644
--- a/drivers/iio/light/cm32181.c
+++ b/drivers/iio/light/cm32181.c
@@ -26,7 +26,7 @@
 #define CM32181_REG_ADDR_ID		0x07
 
 /* Number of Configurable Registers */
-#define CM32181_CONF_REG_NUM		0x01
+#define CM32181_CONF_REG_NUM		4
 
 /* CMD register */
 #define CM32181_CMD_ALS_DISABLE		BIT(0)
@@ -53,10 +53,6 @@
 
 #define SMBUS_ALERT_RESPONSE_ADDRESS	0x0c
 
-static const u8 cm32181_reg[CM32181_CONF_REG_NUM] = {
-	CM32181_REG_ADDR_CMD,
-};
-
 struct cm32181_chip_info {
 	const char *name;
 	const int *als_it_bits;
@@ -69,6 +65,7 @@ struct cm32181_chip {
 	const struct cm32181_chip_info *info;
 	struct mutex lock;
 	u16 conf_regs[CM32181_CONF_REG_NUM];
+	unsigned long init_regs_bitmap;
 	int calibscale;
 };
 
@@ -130,12 +127,13 @@ static int cm32181_reg_init(struct cm32181_chip *cm32181)
 	/* Default Values */
 	cm32181->conf_regs[CM32181_REG_ADDR_CMD] =
 			CM32181_CMD_ALS_IT_DEFAULT | CM32181_CMD_ALS_SM_DEFAULT;
+	cm32181->init_regs_bitmap = BIT(CM32181_REG_ADDR_CMD);
 	cm32181->calibscale = CM32181_CALIBSCALE_DEFAULT;
 
 	/* Initialize registers*/
-	for (i = 0; i < CM32181_CONF_REG_NUM; i++) {
-		ret = i2c_smbus_write_word_data(client, cm32181_reg[i],
-			cm32181->conf_regs[i]);
+	for_each_set_bit(i, &cm32181->init_regs_bitmap, CM32181_CONF_REG_NUM) {
+		ret = i2c_smbus_write_word_data(client, i,
+						cm32181->conf_regs[i]);
 		if (ret < 0)
 			return ret;
 	}
-- 
2.26.0

[PATCH v4 08/11] iio: light: cm32181: Use units of 1/100000th for calibscale and lux_per_bit

[Hans de Goede]

Use units of 1/100000th for calibscale and lux_per_bit. The similar
cm3232 driver already uses 1/100000th as unit for calibscale.

This allows for higher-accuracy and makes it easier to add support
for getting device-specific calibscale and lux_per_bit values from
a device's ACPI tables, as the values in the ACPI tables also use
1/100000th units.

This units change means that our intermediate values in cm32181_get_lux()
may get quite big, change the type of the lux variable to a u64 to
deal with this.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/iio/light/cm32181.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
index f5af986e1ed4..59c95e22ad00 100644
--- a/drivers/iio/light/cm32181.c
+++ b/drivers/iio/light/cm32181.c
@@ -45,11 +45,11 @@
 #define CM32181_CMD_ALS_SM_MASK		(0x03 << CM32181_CMD_ALS_SM_SHIFT)
 #define CM32181_CMD_ALS_SM_DEFAULT	(0x01 << CM32181_CMD_ALS_SM_SHIFT)
 
-#define CM32181_MLUX_PER_BIT		5	/* ALS_SM=01 IT=800ms */
-#define CM32181_MLUX_PER_BIT_BASE_IT	800000	/* Based on IT=800ms */
-#define	CM32181_CALIBSCALE_DEFAULT	1000
-#define CM32181_CALIBSCALE_RESOLUTION	1000
-#define MLUX_PER_LUX			1000
+#define CM32181_LUX_PER_BIT		500	/* ALS_SM=01 IT=800ms */
+#define CM32181_LUX_PER_BIT_RESOLUTION	100000
+#define CM32181_LUX_PER_BIT_BASE_IT	800000	/* Based on IT=800ms */
+#define CM32181_CALIBSCALE_DEFAULT	100000
+#define CM32181_CALIBSCALE_RESOLUTION	100000
 
 #define SMBUS_ALERT_RESPONSE_ADDRESS	0x0c
 
@@ -219,15 +219,15 @@ static int cm32181_get_lux(struct cm32181_chip *cm32181)
 	struct i2c_client *client = cm32181->client;
 	int ret;
 	int als_it;
-	unsigned long lux;
+	u64 lux;
 
 	ret = cm32181_read_als_it(cm32181, &als_it);
 	if (ret < 0)
 		return -EINVAL;
 
-	lux = CM32181_MLUX_PER_BIT;
-	lux *= CM32181_MLUX_PER_BIT_BASE_IT;
-	lux /= als_it;
+	lux = CM32181_LUX_PER_BIT;
+	lux *= CM32181_LUX_PER_BIT_BASE_IT;
+	lux = div_u64(lux, als_it);
 
 	ret = i2c_smbus_read_word_data(client, CM32181_REG_ADDR_ALS);
 	if (ret < 0)
@@ -235,8 +235,8 @@ static int cm32181_get_lux(struct cm32181_chip *cm32181)
 
 	lux *= ret;
 	lux *= cm32181->calibscale;
-	lux /= CM32181_CALIBSCALE_RESOLUTION;
-	lux /= MLUX_PER_LUX;
+	lux = div_u64(lux, CM32181_CALIBSCALE_RESOLUTION);
+	lux = div_u64(lux, CM32181_LUX_PER_BIT_RESOLUTION);
 
 	if (lux > 0xFFFF)
 		lux = 0xFFFF;
-- 
2.26.0

[PATCH v4 09/11] iio: light: cm32181: Make lux_per_bit and lux_per_bit_base_it runtime settings

[Hans de Goede]

Make lux_per_bit and lux_per_bit_base_it settings stored in struct
cm32181_chip instead of a hardcoded (defined) values.

This is a preparation patch for reading some ACPI tables which specify
a device specific lux_per_bit value.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/iio/light/cm32181.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
index 59c95e22ad00..a0812e3cba9b 100644
--- a/drivers/iio/light/cm32181.c
+++ b/drivers/iio/light/cm32181.c
@@ -67,6 +67,8 @@ struct cm32181_chip {
 	u16 conf_regs[CM32181_CONF_REG_NUM];
 	unsigned long init_regs_bitmap;
 	int calibscale;
+	int lux_per_bit;
+	int lux_per_bit_base_it;
 };
 
 /* CM3218 Family */
@@ -129,6 +131,8 @@ static int cm32181_reg_init(struct cm32181_chip *cm32181)
 			CM32181_CMD_ALS_IT_DEFAULT | CM32181_CMD_ALS_SM_DEFAULT;
 	cm32181->init_regs_bitmap = BIT(CM32181_REG_ADDR_CMD);
 	cm32181->calibscale = CM32181_CALIBSCALE_DEFAULT;
+	cm32181->lux_per_bit = CM32181_LUX_PER_BIT;
+	cm32181->lux_per_bit_base_it = CM32181_LUX_PER_BIT_BASE_IT;
 
 	/* Initialize registers*/
 	for_each_set_bit(i, &cm32181->init_regs_bitmap, CM32181_CONF_REG_NUM) {
@@ -225,8 +229,8 @@ static int cm32181_get_lux(struct cm32181_chip *cm32181)
 	if (ret < 0)
 		return -EINVAL;
 
-	lux = CM32181_LUX_PER_BIT;
-	lux *= CM32181_LUX_PER_BIT_BASE_IT;
+	lux = cm32181->lux_per_bit;
+	lux *= cm32181->lux_per_bit_base_it;
 	lux = div_u64(lux, als_it);
 
 	ret = i2c_smbus_read_word_data(client, CM32181_REG_ADDR_ALS);
-- 
2.26.0

[PATCH v4 10/11] iio: light: cm32181: Add support for parsing CPM0 and CPM1 ACPI tables

[Hans de Goede]

On ACPI based systems the CPLM3218 ACPI device node describing the
CM3218[1] sensor typically will have some extra tables with register
init values for initializing the sensor and calibration info.

This is based on a newer version of cm32181.c, with a copyright of:

 * Copyright (C) 2014 Capella Microsystems Inc.
 * Author: Kevin Tsai <ktsai@capellamicro.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2, as published
 * by the Free Software Foundation.

Which is floating around on the net in various places, but the changes
from this newer version never made it upstream.

This was tested on the following models: Acer Switch 10 SW5-012 (CM32181)
Asus T100TA (CM3218), Asus T100CHI (CM3218) and HP X2 10-n000nd (CM32181).

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Changes in v2:
- Factor out the parsing into a separate helper function
---
 drivers/iio/light/cm32181.c | 101 ++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)

diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
index a0812e3cba9b..5eeefa3ee4f1 100644
--- a/drivers/iio/light/cm32181.c
+++ b/drivers/iio/light/cm32181.c
@@ -4,6 +4,7 @@
  * Author: Kevin Tsai <ktsai@capellamicro.com>
  */
 
+#include <linux/acpi.h>
 #include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/i2c.h>
@@ -53,6 +54,15 @@
 
 #define SMBUS_ALERT_RESPONSE_ADDRESS	0x0c
 
+/* CPM0 Index 0: device-id (3218 or 32181), 1: Unknown, 2: init_regs_bitmap */
+#define CPM0_REGS_BITMAP		2
+#define CPM0_HEADER_SIZE		3
+
+/* CPM1 Index 0: lux_per_bit, 1: calibscale, 2: resolution (100000) */
+#define CPM1_LUX_PER_BIT		0
+#define CPM1_CALIBSCALE			1
+#define CPM1_SIZE			3
+
 struct cm32181_chip_info {
 	const char *name;
 	const int *als_it_bits;
@@ -61,6 +71,7 @@ struct cm32181_chip_info {
 };
 
 struct cm32181_chip {
+	struct device *dev;
 	struct i2c_client *client;
 	const struct cm32181_chip_info *info;
 	struct mutex lock;
@@ -95,6 +106,92 @@ const struct cm32181_chip_info cm32181_chip_info = {
 	.num_als_it = ARRAY_SIZE(cm32181_als_it_bits),
 };
 
+static int cm32181_read_als_it(struct cm32181_chip *cm32181, int *val2);
+
+#ifdef CONFIG_ACPI
+/**
+ * cm32181_acpi_get_cpm() - Get CPM object from ACPI
+ * @client	pointer of struct i2c_client.
+ * @obj_name	pointer of ACPI object name.
+ * @count	maximum size of return array.
+ * @vals	pointer of array for return elements.
+ *
+ * Convert ACPI CPM table to array.
+ *
+ * Return: -ENODEV for fail.  Otherwise is number of elements.
+ */
+static int cm32181_acpi_get_cpm(struct device *dev, char *obj_name,
+				u64 *values, int count)
+{
+	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+	union acpi_object *cpm, *elem;
+	acpi_handle handle;
+	acpi_status status;
+	int i;
+
+	handle = ACPI_HANDLE(dev);
+	if (!handle)
+		return -ENODEV;
+
+	status = acpi_evaluate_object(handle, obj_name, NULL, &buffer);
+	if (ACPI_FAILURE(status)) {
+		dev_err(dev, "object %s not found\n", obj_name);
+		return -ENODEV;
+	}
+
+	cpm = buffer.pointer;
+	if (cpm->package.count > count)
+		dev_warn(dev, "%s table contains %d values, only using first %d values\n",
+			 obj_name, cpm->package.count, count);
+
+	count = min_t(int, cpm->package.count, count);
+	for (i = 0; i < count; i++) {
+		elem = &(cpm->package.elements[i]);
+		values[i] = elem->integer.value;
+	}
+
+	kfree(buffer.pointer);
+
+	return count;
+}
+
+static void cm32181_acpi_parse_cpm_tables(struct cm32181_chip *cm32181)
+{
+	u64 vals[CPM0_HEADER_SIZE + CM32181_CONF_REG_NUM];
+	struct device *dev = cm32181->dev;
+	int i, count;
+
+	count = cm32181_acpi_get_cpm(dev, "CPM0", vals, ARRAY_SIZE(vals));
+	if (count <= CPM0_HEADER_SIZE)
+		return;
+
+	count -= CPM0_HEADER_SIZE;
+
+	cm32181->init_regs_bitmap = vals[CPM0_REGS_BITMAP];
+	cm32181->init_regs_bitmap &= GENMASK(count - 1, 0);
+	for_each_set_bit(i, &cm32181->init_regs_bitmap, count)
+		cm32181->conf_regs[i] =	vals[CPM0_HEADER_SIZE + i];
+
+	count = cm32181_acpi_get_cpm(dev, "CPM1", vals, ARRAY_SIZE(vals));
+	if (count != CPM1_SIZE)
+		return;
+
+	cm32181->lux_per_bit = vals[CPM1_LUX_PER_BIT];
+
+	/* Check for uncalibrated devices */
+	if (vals[CPM1_CALIBSCALE] == CM32181_CALIBSCALE_DEFAULT)
+		return;
+
+	cm32181->calibscale = vals[CPM1_CALIBSCALE];
+	/* CPM1 lux_per_bit is for the current it value */
+	cm32181_read_als_it(cm32181, &cm32181->lux_per_bit_base_it);
+}
+#else
+static void cm32181_acpi_parse_cpm_tables(struct cm32181_chip *cm32181)
+{
+}
+#endif /* CONFIG_ACPI */
+
 /**
  * cm32181_reg_init() - Initialize CM32181 registers
  * @cm32181:	pointer of struct cm32181.
@@ -134,6 +231,9 @@ static int cm32181_reg_init(struct cm32181_chip *cm32181)
 	cm32181->lux_per_bit = CM32181_LUX_PER_BIT;
 	cm32181->lux_per_bit_base_it = CM32181_LUX_PER_BIT_BASE_IT;
 
+	if (ACPI_HANDLE(cm32181->dev))
+		cm32181_acpi_parse_cpm_tables(cm32181);
+
 	/* Initialize registers*/
 	for_each_set_bit(i, &cm32181->init_regs_bitmap, CM32181_CONF_REG_NUM) {
 		ret = i2c_smbus_write_word_data(client, i,
@@ -376,6 +476,7 @@ static int cm32181_probe(struct i2c_client *client)
 	}
 
 	cm32181 = iio_priv(indio_dev);
+	cm32181->dev = dev;
 	cm32181->client = client;
 
 	mutex_init(&cm32181->lock);
-- 
2.26.0

[PATCH v4 11/11] iio: light: cm32181: Fix integartion time typo

[Hans de Goede]

Fix integartion time typo and while at it improve the comment with
the typo a bit in general.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/iio/light/cm32181.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
index 5eeefa3ee4f1..7ece523aa09e 100644
--- a/drivers/iio/light/cm32181.c
+++ b/drivers/iio/light/cm32181.c
@@ -250,7 +250,7 @@ static int cm32181_reg_init(struct cm32181_chip *cm32181)
  *  @cm32181:	pointer of struct cm32181
  *  @val2:	pointer of int to load the als_it value.
  *
- *  Report the current integartion time by millisecond.
+ *  Report the current integration time in milliseconds.
  *
  *  Return: IIO_VAL_INT_PLUS_MICRO for success, otherwise -EINVAL.
  */
-- 
2.26.0

Re: [PATCH v4 01/11] iio: light: cm32181: Switch to new style i2c-driver probe function

[Jonathan Cameron]

On Mon,  4 May 2020 14:55:41 +0200
Hans de Goede <hdegoede@redhat.com> wrote:

> Switch to the new style i2c-driver probe_new probe function and drop the
> unnecessary i2c_device_id table (we do not have any old style board files
> using this).
> 
> This is a preparation patch for adding ACPI binding support.
> 
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Hi Hans,

Seems these have all been sent with mime type of quoted-printable.
As git am really doesn't like that I ended up pulling these down from
patchwork.

Please try and sort that email issue out for future patch sets until
we get git am that works with it in standard distro packages (assuming
it ever does)

Otherwise, a bit of fuzz from the patch that dropped the of_match_ptr
protections.

Series applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.

Thanks,

Jonathan


> ---
> Changes in v4:
> - Set indio_dev->name to "cm32181" instead of setting it to dev_name(dev)
> 
> Changes in v3:
> - This is a new patch in v3 of this patch-set
> ---
>  drivers/iio/light/cm32181.c | 15 +++------------
>  1 file changed, 3 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
> index 5f4fb5674fa0..2c139d85ef0c 100644
> --- a/drivers/iio/light/cm32181.c
> +++ b/drivers/iio/light/cm32181.c
> @@ -294,8 +294,7 @@ static const struct iio_info cm32181_info = {
>  	.attrs			= &cm32181_attribute_group,
>  };
>  
> -static int cm32181_probe(struct i2c_client *client,
> -			const struct i2c_device_id *id)
> +static int cm32181_probe(struct i2c_client *client)
>  {
>  	struct cm32181_chip *cm32181;
>  	struct iio_dev *indio_dev;
> @@ -316,7 +315,7 @@ static int cm32181_probe(struct i2c_client *client,
>  	indio_dev->channels = cm32181_channels;
>  	indio_dev->num_channels = ARRAY_SIZE(cm32181_channels);
>  	indio_dev->info = &cm32181_info;
> -	indio_dev->name = id->name;
> +	indio_dev->name = "cm32181";
>  	indio_dev->modes = INDIO_DIRECT_MODE;
>  
>  	ret = cm32181_reg_init(cm32181);
> @@ -338,13 +337,6 @@ static int cm32181_probe(struct i2c_client *client,
>  	return 0;
>  }
>  
> -static const struct i2c_device_id cm32181_id[] = {
> -	{ "cm32181", 0 },
> -	{ }
> -};
> -
> -MODULE_DEVICE_TABLE(i2c, cm32181_id);
> -
>  static const struct of_device_id cm32181_of_match[] = {
>  	{ .compatible = "capella,cm32181" },
>  	{ }
> @@ -356,8 +348,7 @@ static struct i2c_driver cm32181_driver = {
>  		.name	= "cm32181",
>  		.of_match_table = of_match_ptr(cm32181_of_match),
>  	},
> -	.id_table       = cm32181_id,
> -	.probe		= cm32181_probe,
> +	.probe_new	= cm32181_probe,
>  };
>  
>  module_i2c_driver(cm32181_driver);

Re: [PATCH v4 01/11] iio: light: cm32181: Switch to new style i2c-driver probe function

[Hans de Goede]

Hi,

On 5/10/20 11:48 AM, Jonathan Cameron wrote:
> On Mon,  4 May 2020 14:55:41 +0200
> Hans de Goede <hdegoede@redhat.com> wrote:
> 
>> Switch to the new style i2c-driver probe_new probe function and drop the
>> unnecessary i2c_device_id table (we do not have any old style board files
>> using this).
>>
>> This is a preparation patch for adding ACPI binding support.
>>
>> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> Hi Hans,
> 
> Seems these have all been sent with mime type of quoted-printable.
> As git am really doesn't like that I ended up pulling these down from
> patchwork.
> 
> Please try and sort that email issue out for future patch sets until
> we get git am that works with it in standard distro packages (assuming
> it ever does)

Weird, I used git send-email to send the patches, as I always do.
I contribute to a lot of subsystems and this is the first complaint I'm
getting about this ?

> Otherwise, a bit of fuzz from the patch that dropped the of_match_ptr
> protections.
> 
> Series applied to the togreg branch of iio.git and pushed out as testing for
> the autobuilders to play with it.

Great, thank you.

Regards,

Hans



>> ---
>> Changes in v4:
>> - Set indio_dev->name to "cm32181" instead of setting it to dev_name(dev)
>>
>> Changes in v3:
>> - This is a new patch in v3 of this patch-set
>> ---
>>   drivers/iio/light/cm32181.c | 15 +++------------
>>   1 file changed, 3 insertions(+), 12 deletions(-)
>>
>> diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
>> index 5f4fb5674fa0..2c139d85ef0c 100644
>> --- a/drivers/iio/light/cm32181.c
>> +++ b/drivers/iio/light/cm32181.c
>> @@ -294,8 +294,7 @@ static const struct iio_info cm32181_info = {
>>   	.attrs			= &cm32181_attribute_group,
>>   };
>>   
>> -static int cm32181_probe(struct i2c_client *client,
>> -			const struct i2c_device_id *id)
>> +static int cm32181_probe(struct i2c_client *client)
>>   {
>>   	struct cm32181_chip *cm32181;
>>   	struct iio_dev *indio_dev;
>> @@ -316,7 +315,7 @@ static int cm32181_probe(struct i2c_client *client,
>>   	indio_dev->channels = cm32181_channels;
>>   	indio_dev->num_channels = ARRAY_SIZE(cm32181_channels);
>>   	indio_dev->info = &cm32181_info;
>> -	indio_dev->name = id->name;
>> +	indio_dev->name = "cm32181";
>>   	indio_dev->modes = INDIO_DIRECT_MODE;
>>   
>>   	ret = cm32181_reg_init(cm32181);
>> @@ -338,13 +337,6 @@ static int cm32181_probe(struct i2c_client *client,
>>   	return 0;
>>   }
>>   
>> -static const struct i2c_device_id cm32181_id[] = {
>> -	{ "cm32181", 0 },
>> -	{ }
>> -};
>> -
>> -MODULE_DEVICE_TABLE(i2c, cm32181_id);
>> -
>>   static const struct of_device_id cm32181_of_match[] = {
>>   	{ .compatible = "capella,cm32181" },
>>   	{ }
>> @@ -356,8 +348,7 @@ static struct i2c_driver cm32181_driver = {
>>   		.name	= "cm32181",
>>   		.of_match_table = of_match_ptr(cm32181_of_match),
>>   	},
>> -	.id_table       = cm32181_id,
>> -	.probe		= cm32181_probe,
>> +	.probe_new	= cm32181_probe,
>>   };
>>   
>>   module_i2c_driver(cm32181_driver);
> 

Re: [PATCH v4 01/11] iio: light: cm32181: Switch to new style i2c-driver probe function

[Jonathan Cameron]

On Sun, 10 May 2020 12:03:08 +0200
Hans de Goede <hdegoede@redhat.com> wrote:

> Hi,
> 
> On 5/10/20 11:48 AM, Jonathan Cameron wrote:
> > On Mon,  4 May 2020 14:55:41 +0200
> > Hans de Goede <hdegoede@redhat.com> wrote:
> >   
> >> Switch to the new style i2c-driver probe_new probe function and drop the
> >> unnecessary i2c_device_id table (we do not have any old style board files
> >> using this).
> >>
> >> This is a preparation patch for adding ACPI binding support.
> >>
> >> Signed-off-by: Hans de Goede <hdegoede@redhat.com>  
> > Hi Hans,
> > 
> > Seems these have all been sent with mime type of quoted-printable.
> > As git am really doesn't like that I ended up pulling these down from
> > patchwork.
> > 
> > Please try and sort that email issue out for future patch sets until
> > we get git am that works with it in standard distro packages (assuming
> > it ever does)  
> 
> Weird, I used git send-email to send the patches, as I always do.
> I contribute to a lot of subsystems and this is the first complaint I'm
> getting about this ?
It's not been true of the previous ones you've sent me.

A bit of googling suggests git-send-email will do this if it finds a CR
in the patch.  Perhaps that's what happened?

Maybe try sending them one at a time and see if a particular patch is causing
it to happen.  Then play detective on why.

Or just take it as one of those things and ignore it unless it happens again!

J

> 
> > Otherwise, a bit of fuzz from the patch that dropped the of_match_ptr
> > protections.
> > 
> > Series applied to the togreg branch of iio.git and pushed out as testing for
> > the autobuilders to play with it.  
> 
> Great, thank you.
> 
> Regards,
> 
> Hans
> 
> 
> 
> >> ---
> >> Changes in v4:
> >> - Set indio_dev->name to "cm32181" instead of setting it to dev_name(dev)
> >>
> >> Changes in v3:
> >> - This is a new patch in v3 of this patch-set
> >> ---
> >>   drivers/iio/light/cm32181.c | 15 +++------------
> >>   1 file changed, 3 insertions(+), 12 deletions(-)
> >>
> >> diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
> >> index 5f4fb5674fa0..2c139d85ef0c 100644
> >> --- a/drivers/iio/light/cm32181.c
> >> +++ b/drivers/iio/light/cm32181.c
> >> @@ -294,8 +294,7 @@ static const struct iio_info cm32181_info = {
> >>   	.attrs			= &cm32181_attribute_group,
> >>   };
> >>   
> >> -static int cm32181_probe(struct i2c_client *client,
> >> -			const struct i2c_device_id *id)
> >> +static int cm32181_probe(struct i2c_client *client)
> >>   {
> >>   	struct cm32181_chip *cm32181;
> >>   	struct iio_dev *indio_dev;
> >> @@ -316,7 +315,7 @@ static int cm32181_probe(struct i2c_client *client,
> >>   	indio_dev->channels = cm32181_channels;
> >>   	indio_dev->num_channels = ARRAY_SIZE(cm32181_channels);
> >>   	indio_dev->info = &cm32181_info;
> >> -	indio_dev->name = id->name;
> >> +	indio_dev->name = "cm32181";
> >>   	indio_dev->modes = INDIO_DIRECT_MODE;
> >>   
> >>   	ret = cm32181_reg_init(cm32181);
> >> @@ -338,13 +337,6 @@ static int cm32181_probe(struct i2c_client *client,
> >>   	return 0;
> >>   }
> >>   
> >> -static const struct i2c_device_id cm32181_id[] = {
> >> -	{ "cm32181", 0 },
> >> -	{ }
> >> -};
> >> -
> >> -MODULE_DEVICE_TABLE(i2c, cm32181_id);
> >> -
> >>   static const struct of_device_id cm32181_of_match[] = {
> >>   	{ .compatible = "capella,cm32181" },
> >>   	{ }
> >> @@ -356,8 +348,7 @@ static struct i2c_driver cm32181_driver = {
> >>   		.name	= "cm32181",
> >>   		.of_match_table = of_match_ptr(cm32181_of_match),
> >>   	},
> >> -	.id_table       = cm32181_id,
> >> -	.probe		= cm32181_probe,
> >> +	.probe_new	= cm32181_probe,
> >>   };
> >>   
> >>   module_i2c_driver(cm32181_driver);  
> >   
> 

Re: [PATCH v4 10/11] iio: light: cm32181: Add support for parsing CPM0 and CPM1 ACPI tables

[Jonathan Cameron]

On Mon,  4 May 2020 14:55:50 +0200
Hans de Goede <hdegoede@redhat.com> wrote:

> On ACPI based systems the CPLM3218 ACPI device node describing the
> CM3218[1] sensor typically will have some extra tables with register
> init values for initializing the sensor and calibration info.
> 
> This is based on a newer version of cm32181.c, with a copyright of:
> 
>  * Copyright (C) 2014 Capella Microsystems Inc.
>  * Author: Kevin Tsai <ktsai@capellamicro.com>
>  *
>  * This program is free software; you can redistribute it and/or modify it
>  * under the terms of the GNU General Public License version 2, as published
>  * by the Free Software Foundation.
> 
> Which is floating around on the net in various places, but the changes
> from this newer version never made it upstream.
> 
> This was tested on the following models: Acer Switch 10 SW5-012 (CM32181)
> Asus T100TA (CM3218), Asus T100CHI (CM3218) and HP X2 10-n000nd (CM32181).
> 
> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Tiny thing 0-day picked up that I've just fixed and pushed out.

> ---
> Changes in v2:
> - Factor out the parsing into a separate helper function
> ---
>  drivers/iio/light/cm32181.c | 101 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 101 insertions(+)
> 
> diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
> index a0812e3cba9b..5eeefa3ee4f1 100644
> --- a/drivers/iio/light/cm32181.c
> +++ b/drivers/iio/light/cm32181.c
> @@ -4,6 +4,7 @@
>   * Author: Kevin Tsai <ktsai@capellamicro.com>
>   */
>  
> +#include <linux/acpi.h>
>  #include <linux/delay.h>
>  #include <linux/err.h>
>  #include <linux/i2c.h>
> @@ -53,6 +54,15 @@
>  
>  #define SMBUS_ALERT_RESPONSE_ADDRESS	0x0c
>  
> +/* CPM0 Index 0: device-id (3218 or 32181), 1: Unknown, 2: init_regs_bitmap */
> +#define CPM0_REGS_BITMAP		2
> +#define CPM0_HEADER_SIZE		3
> +
> +/* CPM1 Index 0: lux_per_bit, 1: calibscale, 2: resolution (100000) */
> +#define CPM1_LUX_PER_BIT		0
> +#define CPM1_CALIBSCALE			1
> +#define CPM1_SIZE			3
> +
>  struct cm32181_chip_info {
>  	const char *name;
>  	const int *als_it_bits;
> @@ -61,6 +71,7 @@ struct cm32181_chip_info {
>  };
>  
>  struct cm32181_chip {
> +	struct device *dev;
>  	struct i2c_client *client;
>  	const struct cm32181_chip_info *info;
>  	struct mutex lock;
> @@ -95,6 +106,92 @@ const struct cm32181_chip_info cm32181_chip_info = {
>  	.num_als_it = ARRAY_SIZE(cm32181_als_it_bits),
>  };
>  
> +static int cm32181_read_als_it(struct cm32181_chip *cm32181, int *val2);
> +
> +#ifdef CONFIG_ACPI
> +/**
> + * cm32181_acpi_get_cpm() - Get CPM object from ACPI
> + * @client	pointer of struct i2c_client.
> + * @obj_name	pointer of ACPI object name.
> + * @count	maximum size of return array.
> + * @vals	pointer of array for return elements.
> + *
> + * Convert ACPI CPM table to array.
> + *
> + * Return: -ENODEV for fail.  Otherwise is number of elements.
> + */
> +static int cm32181_acpi_get_cpm(struct device *dev, char *obj_name,
> +				u64 *values, int count)
> +{
> +	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
> +	union acpi_object *cpm, *elem;
> +	acpi_handle handle;
> +	acpi_status status;
> +	int i;
> +
> +	handle = ACPI_HANDLE(dev);
> +	if (!handle)
> +		return -ENODEV;
> +
> +	status = acpi_evaluate_object(handle, obj_name, NULL, &buffer);
> +	if (ACPI_FAILURE(status)) {
> +		dev_err(dev, "object %s not found\n", obj_name);
> +		return -ENODEV;
> +	}
> +
> +	cpm = buffer.pointer;
> +	if (cpm->package.count > count)
> +		dev_warn(dev, "%s table contains %d values, only using first %d values\n",
> +			 obj_name, cpm->package.count, count);

cpm->package.count is unsigned.

> +
> +	count = min_t(int, cpm->package.count, count);
> +	for (i = 0; i < count; i++) {
> +		elem = &(cpm->package.elements[i]);
> +		values[i] = elem->integer.value;
> +	}
> +
> +	kfree(buffer.pointer);
> +
> +	return count;
> +}
> +
> +static void cm32181_acpi_parse_cpm_tables(struct cm32181_chip *cm32181)
> +{
> +	u64 vals[CPM0_HEADER_SIZE + CM32181_CONF_REG_NUM];
> +	struct device *dev = cm32181->dev;
> +	int i, count;
> +
> +	count = cm32181_acpi_get_cpm(dev, "CPM0", vals, ARRAY_SIZE(vals));
> +	if (count <= CPM0_HEADER_SIZE)
> +		return;
> +
> +	count -= CPM0_HEADER_SIZE;
> +
> +	cm32181->init_regs_bitmap = vals[CPM0_REGS_BITMAP];
> +	cm32181->init_regs_bitmap &= GENMASK(count - 1, 0);
> +	for_each_set_bit(i, &cm32181->init_regs_bitmap, count)
> +		cm32181->conf_regs[i] =	vals[CPM0_HEADER_SIZE + i];
> +
> +	count = cm32181_acpi_get_cpm(dev, "CPM1", vals, ARRAY_SIZE(vals));
> +	if (count != CPM1_SIZE)
> +		return;
> +
> +	cm32181->lux_per_bit = vals[CPM1_LUX_PER_BIT];
> +
> +	/* Check for uncalibrated devices */
> +	if (vals[CPM1_CALIBSCALE] == CM32181_CALIBSCALE_DEFAULT)
> +		return;
> +
> +	cm32181->calibscale = vals[CPM1_CALIBSCALE];
> +	/* CPM1 lux_per_bit is for the current it value */
> +	cm32181_read_als_it(cm32181, &cm32181->lux_per_bit_base_it);
> +}
> +#else
> +static void cm32181_acpi_parse_cpm_tables(struct cm32181_chip *cm32181)
> +{
> +}
> +#endif /* CONFIG_ACPI */
> +
>  /**
>   * cm32181_reg_init() - Initialize CM32181 registers
>   * @cm32181:	pointer of struct cm32181.
> @@ -134,6 +231,9 @@ static int cm32181_reg_init(struct cm32181_chip *cm32181)
>  	cm32181->lux_per_bit = CM32181_LUX_PER_BIT;
>  	cm32181->lux_per_bit_base_it = CM32181_LUX_PER_BIT_BASE_IT;
>  
> +	if (ACPI_HANDLE(cm32181->dev))
> +		cm32181_acpi_parse_cpm_tables(cm32181);
> +
>  	/* Initialize registers*/
>  	for_each_set_bit(i, &cm32181->init_regs_bitmap, CM32181_CONF_REG_NUM) {
>  		ret = i2c_smbus_write_word_data(client, i,
> @@ -376,6 +476,7 @@ static int cm32181_probe(struct i2c_client *client)
>  	}
>  
>  	cm32181 = iio_priv(indio_dev);
> +	cm32181->dev = dev;
>  	cm32181->client = client;
>  
>  	mutex_init(&cm32181->lock);

Re: [PATCH v4 10/11] iio: light: cm32181: Add support for parsing CPM0 and CPM1 ACPI tables

[Hans de Goede]

Hi,

On 5/11/20 9:20 PM, Jonathan Cameron wrote:
> On Mon,  4 May 2020 14:55:50 +0200
> Hans de Goede <hdegoede@redhat.com> wrote:
> 
>> On ACPI based systems the CPLM3218 ACPI device node describing the
>> CM3218[1] sensor typically will have some extra tables with register
>> init values for initializing the sensor and calibration info.
>>
>> This is based on a newer version of cm32181.c, with a copyright of:
>>
>>   * Copyright (C) 2014 Capella Microsystems Inc.
>>   * Author: Kevin Tsai <ktsai@capellamicro.com>
>>   *
>>   * This program is free software; you can redistribute it and/or modify it
>>   * under the terms of the GNU General Public License version 2, as published
>>   * by the Free Software Foundation.
>>
>> Which is floating around on the net in various places, but the changes
>> from this newer version never made it upstream.
>>
>> This was tested on the following models: Acer Switch 10 SW5-012 (CM32181)
>> Asus T100TA (CM3218), Asus T100CHI (CM3218) and HP X2 10-n000nd (CM32181).
>>
>> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
>> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> Tiny thing 0-day picked up that I've just fixed and pushed out.
> 
>> ---
>> Changes in v2:
>> - Factor out the parsing into a separate helper function
>> ---
>>   drivers/iio/light/cm32181.c | 101 ++++++++++++++++++++++++++++++++++++
>>   1 file changed, 101 insertions(+)
>>
>> diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
>> index a0812e3cba9b..5eeefa3ee4f1 100644
>> --- a/drivers/iio/light/cm32181.c
>> +++ b/drivers/iio/light/cm32181.c
>> @@ -4,6 +4,7 @@
>>    * Author: Kevin Tsai <ktsai@capellamicro.com>
>>    */
>>   
>> +#include <linux/acpi.h>
>>   #include <linux/delay.h>
>>   #include <linux/err.h>
>>   #include <linux/i2c.h>
>> @@ -53,6 +54,15 @@
>>   
>>   #define SMBUS_ALERT_RESPONSE_ADDRESS	0x0c
>>   
>> +/* CPM0 Index 0: device-id (3218 or 32181), 1: Unknown, 2: init_regs_bitmap */
>> +#define CPM0_REGS_BITMAP		2
>> +#define CPM0_HEADER_SIZE		3
>> +
>> +/* CPM1 Index 0: lux_per_bit, 1: calibscale, 2: resolution (100000) */
>> +#define CPM1_LUX_PER_BIT		0
>> +#define CPM1_CALIBSCALE			1
>> +#define CPM1_SIZE			3
>> +
>>   struct cm32181_chip_info {
>>   	const char *name;
>>   	const int *als_it_bits;
>> @@ -61,6 +71,7 @@ struct cm32181_chip_info {
>>   };
>>   
>>   struct cm32181_chip {
>> +	struct device *dev;
>>   	struct i2c_client *client;
>>   	const struct cm32181_chip_info *info;
>>   	struct mutex lock;
>> @@ -95,6 +106,92 @@ const struct cm32181_chip_info cm32181_chip_info = {
>>   	.num_als_it = ARRAY_SIZE(cm32181_als_it_bits),
>>   };
>>   
>> +static int cm32181_read_als_it(struct cm32181_chip *cm32181, int *val2);
>> +
>> +#ifdef CONFIG_ACPI
>> +/**
>> + * cm32181_acpi_get_cpm() - Get CPM object from ACPI
>> + * @client	pointer of struct i2c_client.
>> + * @obj_name	pointer of ACPI object name.
>> + * @count	maximum size of return array.
>> + * @vals	pointer of array for return elements.
>> + *
>> + * Convert ACPI CPM table to array.
>> + *
>> + * Return: -ENODEV for fail.  Otherwise is number of elements.
>> + */
>> +static int cm32181_acpi_get_cpm(struct device *dev, char *obj_name,
>> +				u64 *values, int count)
>> +{
>> +	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
>> +	union acpi_object *cpm, *elem;
>> +	acpi_handle handle;
>> +	acpi_status status;
>> +	int i;
>> +
>> +	handle = ACPI_HANDLE(dev);
>> +	if (!handle)
>> +		return -ENODEV;
>> +
>> +	status = acpi_evaluate_object(handle, obj_name, NULL, &buffer);
>> +	if (ACPI_FAILURE(status)) {
>> +		dev_err(dev, "object %s not found\n", obj_name);
>> +		return -ENODEV;
>> +	}
>> +
>> +	cpm = buffer.pointer;
>> +	if (cpm->package.count > count)
>> +		dev_warn(dev, "%s table contains %d values, only using first %d values\n",
>> +			 obj_name, cpm->package.count, count);
> 
> cpm->package.count is unsigned.

Ok, thank you for letting me know.

Regards,

Hans