[PATCH v1 0/2] iio: accel: add support for ADXL355

[PATCH v1 0/2] iio: accel: add support for ADXL355

[Puranjay Mohan]

Add the dt-bindings and the driver for ADXL355 3-axis MEMS Accelerometer.

Changes since v0:
1. Move adxl355_hpf_3db_table to adxl355_data structure. This is done to make
sure that each device gets its own table.
2. Make local regmap definitions private to adxl355_core.c.
3. Other minor coding style changes.

Puranjay Mohan (2):
  dt-bindings: iio: accel: Add ADXL355 in trivial-devices
  iio: accel: Add driver support for ADXL355

 .../devicetree/bindings/trivial-devices.yaml  |   2 +
 MAINTAINERS                                   |   7 +
 drivers/iio/accel/Kconfig                     |  29 +
 drivers/iio/accel/Makefile                    |   3 +
 drivers/iio/accel/adxl355.h                   |  83 +++
 drivers/iio/accel/adxl355_core.c              | 541 ++++++++++++++++++
 drivers/iio/accel/adxl355_i2c.c               |  63 ++
 drivers/iio/accel/adxl355_spi.c               |  66 +++
 8 files changed, 794 insertions(+)
 create mode 100644 drivers/iio/accel/adxl355.h
 create mode 100644 drivers/iio/accel/adxl355_core.c
 create mode 100644 drivers/iio/accel/adxl355_i2c.c
 create mode 100644 drivers/iio/accel/adxl355_spi.c

-- 
2.30.1

[PATCH v1 1/2] dt-bindings: iio: accel: Add ADXL355 in trivial-devices

[Puranjay Mohan]

Add ADXL355, a 3-Axis MEMS Accelerometer into trivial-devices.yaml.

Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
---
 Documentation/devicetree/bindings/trivial-devices.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/trivial-devices.yaml b/Documentation/devicetree/bindings/trivial-devices.yaml
index 8341e9d23..0097d6e81 100644
--- a/Documentation/devicetree/bindings/trivial-devices.yaml
+++ b/Documentation/devicetree/bindings/trivial-devices.yaml
@@ -41,6 +41,8 @@ properties:
           - adi,adp5589
             # +/-1C TDM Extended Temp Range I.C
           - adi,adt7461
+            # ADXL355:- 3-Axis Low noise MEMS Accelerometer.
+          - adi,adxl355
             # +/-1C TDM Extended Temp Range I.C
           - adt7461
             # AMS iAQ-Core VOC Sensor
-- 
2.30.1

[PATCH v1 2/2] iio: accel: Add driver support for ADXL355

[Puranjay Mohan]

ADXL355 is 3-axis MEMS Accelerometer. It offers low noise density,
low 0g offset drift, low power with selectable measurement ranges.
It also features programmable high-pass and low-pass filters.

Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/adxl354_adxl355.pdf
Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
---
 MAINTAINERS                      |   7 +
 drivers/iio/accel/Kconfig        |  29 ++
 drivers/iio/accel/Makefile       |   3 +
 drivers/iio/accel/adxl355.h      |  83 +++++
 drivers/iio/accel/adxl355_core.c | 541 +++++++++++++++++++++++++++++++
 drivers/iio/accel/adxl355_i2c.c  |  63 ++++
 drivers/iio/accel/adxl355_spi.c  |  66 ++++
 7 files changed, 792 insertions(+)
 create mode 100644 drivers/iio/accel/adxl355.h
 create mode 100644 drivers/iio/accel/adxl355_core.c
 create mode 100644 drivers/iio/accel/adxl355_i2c.c
 create mode 100644 drivers/iio/accel/adxl355_spi.c

diff --git a/MAINTAINERS b/MAINTAINERS
index bd7aff0c1..461f2a192 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -586,6 +586,13 @@ W:	http://ez.analog.com/community/linux-device-drivers
 F:	Documentation/devicetree/bindings/iio/accel/adi,adxl345.yaml
 F:	drivers/input/misc/adxl34x.c
 
+ADXL355 THREE-AXIS DIGITAL ACCELEROMETER DRIVER
+M:	Puranjay Mohan <puranjay12@gmail.com>
+L:	linux-iio@vger.kernel.org
+S:	Supported
+F:	drivers/iio/accel/adxl34x.c
+F:	Documentation/devicetree/bindings/iio/accel/adi,adxl355.yaml
+
 ADXL372 THREE-AXIS DIGITAL ACCELEROMETER DRIVER
 M:	Michael Hennerich <michael.hennerich@analog.com>
 S:	Supported
diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
index cceda3cec..9a65353a4 100644
--- a/drivers/iio/accel/Kconfig
+++ b/drivers/iio/accel/Kconfig
@@ -61,6 +61,35 @@ config ADXL345_SPI
 	  will be called adxl345_spi and you will also get adxl345_core
 	  for the core module.
 
+config ADXL355
+	tristate
+
+config ADXL355_I2C
+	tristate "Analog Devices ADXL355 3-Axis Digital Accelerometer I2C Driver"
+	depends on I2C
+	select ADXL355
+	select REGMAP_I2C
+	help
+	  Say Y here if you want to build support for the Analog Devices
+	  ADXL355 3-axis digital accelerometer.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called adxl355_i2c and you will also get adxl355_core
+	  for the core module.
+
+config ADXL355_SPI
+	tristate "Analog Devices ADXL355 3-Axis Digital Accelerometer SPI Driver"
+	depends on SPI
+	select ADXL355
+	select REGMAP_SPI
+	help
+	  Say Y here if you want to build support for the Analog Devices
+	  ADXL355 3-axis digital accelerometer.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called adxl355_spi and you will also get adxl355_core
+	  for the core module.
+
 config ADXL372
 	tristate
 	select IIO_BUFFER
diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
index 32cd1342a..0e4721d2d 100644
--- a/drivers/iio/accel/Makefile
+++ b/drivers/iio/accel/Makefile
@@ -9,6 +9,9 @@ obj-$(CONFIG_ADIS16209) += adis16209.o
 obj-$(CONFIG_ADXL345) += adxl345_core.o
 obj-$(CONFIG_ADXL345_I2C) += adxl345_i2c.o
 obj-$(CONFIG_ADXL345_SPI) += adxl345_spi.o
+obj-$(CONFIG_ADXL355) += adxl355_core.o
+obj-$(CONFIG_ADXL355_I2C) += adxl355_i2c.o
+obj-$(CONFIG_ADXL355_SPI) += adxl355_spi.o
 obj-$(CONFIG_ADXL372) += adxl372.o
 obj-$(CONFIG_ADXL372_I2C) += adxl372_i2c.o
 obj-$(CONFIG_ADXL372_SPI) += adxl372_spi.o
diff --git a/drivers/iio/accel/adxl355.h b/drivers/iio/accel/adxl355.h
new file mode 100644
index 000000000..e52c294d8
--- /dev/null
+++ b/drivers/iio/accel/adxl355.h
@@ -0,0 +1,83 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * ADXL355 3-Axis Digital Accelerometer
+ *
+ * Copyright (c) 2021 Puranjay Mohan <puranjay12@gmail.com>
+ */
+
+#ifndef _ADXL355_H_
+#define _ADXL355_H_
+
+#include <linux/regmap.h>
+
+/* ADXL355 Register Definitions */
+#define ADXL355_DEVID_AD	0x00
+#define ADXL355_DEVID_MST	0x01
+#define ADXL355_PARTID		0x02
+#define ADXL355_REVID		0x03
+#define ADXL355_STATUS		0x04
+#define ADXL355_FIFO_ENTRIES	0x05
+#define ADXL355_TEMP2		0x06
+#define ADXL355_XDATA3		0x08
+#define ADXL355_YDATA3		0x0B
+#define ADXL355_ZDATA3		0x0E
+#define ADXL355_FIFO_DATA	0x11
+#define ADXL355_OFFSET_X_H	0x1E
+#define ADXL355_OFFSET_Y_H	0x20
+#define ADXL355_OFFSET_Z_H	0x22
+#define ADXL355_ACT_EN		0x24
+#define ADXL355_ACT_THRESH_H	0x25
+#define ADXL355_ACT_THRESH_L	0x26
+#define ADXL355_ACT_COUNT	0x27
+#define ADXL355_FILTER		0x28
+#define ADXL355_FIFO_SAMPLES	0x29
+#define ADXL355_INT_MAP		0x2A
+#define ADXL355_SYNC		0x2B
+#define ADXL355_RANGE		0x2C
+#define ADXL355_POWER_CTL	0x2D
+#define ADXL355_SELF_TEST	0x2E
+#define ADXL355_RESET		0x2F
+
+#define ADXL355_DEVID_AD_VAL	0xAD
+#define ADXL355_DEVID_MST_VAL	0x1D
+#define ADXL355_PARTID_VAL	0xED
+#define ADXL355_REVID_VAL	0x01
+#define ADXL355_RESET_CODE	0x52
+
+#define ADXL355_POWER_CTL_MODE_MSK	GENMASK(1, 0)
+
+#define ADXL355_FILTER_ODR_MSK			GENMASK(3, 0)
+#define ADXL355_FILTER_ODR_MODE(x)		((x) & 0xF)
+#define ADXL355_FILTER_HPF_MSK			GENMASK(6, 4)
+#define ADXL355_FILTER_HPF_MODE(x)		(((x) & 0x7) << 4)
+
+/*
+ * The datasheet defines an intercept of 1885 LSB at 25 degC
+ * and a slope of -9.05 LSB/C. The following formula can be used to find the
+ * temperature:
+ * Temp = ((RAW - 1885)/(-9.05)) + 25 but this doesn't follow the format of
+ * the IIO which is Temp = (RAW + OFFSET) * SCALE. Hence using some rearranging
+ * we get the scale as -110.49723 and offset as -2111.25
+ */
+#define TEMP_SCALE_VAL -110
+#define TEMP_SCALE_VAL2 497238
+#define TEMP_OFFSET_VAL -2111
+#define TEMP_OFFSET_VAL2 250000
+
+/*
+ * At +/- 2g with 20-bit resolution, scale is given in datasheet as
+ * 3.9ug/LSB = 0.0000039 * 9.80665 = 0.00003824593 m/s^2
+ */
+#define ADXL355_NSCALE	38245
+
+extern const struct regmap_range adxl355_read_reg_range[];
+
+extern const struct regmap_access_table adxl355_readable_regs_tbl;
+
+extern const struct regmap_range adxl355_write_reg_range[];
+
+extern const struct regmap_access_table adxl355_writeable_regs_tbl;
+
+int adxl355_core_probe(struct device *dev, struct regmap *regmap,
+		       const char *name);
+#endif /* _ADXL355_H_ */
diff --git a/drivers/iio/accel/adxl355_core.c b/drivers/iio/accel/adxl355_core.c
new file mode 100644
index 000000000..ff90e5aa6
--- /dev/null
+++ b/drivers/iio/accel/adxl355_core.c
@@ -0,0 +1,541 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ADXL355 3-Axis Digital Accelerometer IIO core driver
+ *
+ * Copyright (c) 2021 Puranjay Mohan <puranjay12@gmail.com>
+ *
+ * Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/adxl354_adxl355.pdf
+ */
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/limits.h>
+#include <linux/math64.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+#include "adxl355.h"
+
+static const struct regmap_range adxl355_read_reg_range[] = {
+	regmap_reg_range(ADXL355_DEVID_AD, ADXL355_FIFO_DATA),
+	regmap_reg_range(ADXL355_OFFSET_X_H, ADXL355_SELF_TEST)
+};
+
+const struct regmap_access_table adxl355_readable_regs_tbl = {
+	.yes_ranges = adxl355_read_reg_range,
+	.n_yes_ranges = ARRAY_SIZE(adxl355_read_reg_range),
+};
+EXPORT_SYMBOL_GPL(adxl355_readable_regs_tbl);
+
+static const struct regmap_range adxl355_write_reg_range[] = {
+	regmap_reg_range(ADXL355_OFFSET_X_H, ADXL355_RESET)
+};
+
+const struct regmap_access_table adxl355_writeable_regs_tbl = {
+	.yes_ranges = adxl355_write_reg_range,
+	.n_yes_ranges = ARRAY_SIZE(adxl355_write_reg_range),
+};
+EXPORT_SYMBOL_GPL(adxl355_writeable_regs_tbl);
+
+enum adxl355_op_mode {
+	ADXL355_MEASUREMENT,
+	ADXL355_STANDBY,
+	ADXL355_TEMP_OFF
+};
+
+enum adxl355_odr {
+	ADXL355_ODR_4000HZ,
+	ADXL355_ODR_2000HZ,
+	ADXL355_ODR_1000HZ,
+	ADXL355_ODR_500HZ,
+	ADXL355_ODR_250HZ,
+	ADXL355_ODR_125HZ,
+	ADXL355_ODR_62_5HZ,
+	ADXL355_ODR_31_25HZ,
+	ADXL355_ODR_15_625HZ,
+	ADXL355_ODR_7_813HZ,
+	ADXL355_ODR_3_906HZ
+};
+
+enum adxl355_hpf_3db {
+	ADXL355_HPF_OFF,
+	ADXL355_HPF_24_7,
+	ADXL355_HPF_6_2084,
+	ADXL355_HPF_1_5545,
+	ADXL355_HPF_0_3862,
+	ADXL355_HPF_0_0954,
+	ADXL355_HPF_0_0238
+};
+
+static const int adxl355_odr_table[][2] = {
+	[0] = {4000, 0},
+	[1] = {2000, 0},
+	[2] = {1000, 0},
+	[3] = {500, 0},
+	[4] = {250, 0},
+	[5] = {125, 0},
+	[6] = {62, 500000},
+	[7] = {31, 250000},
+	[8] = {15, 625000},
+	[9] = {7, 813000},
+	[10] = {3, 906000}
+};
+
+static const int adxl355_hpf_3db_multipliers[] = {
+	0,
+	247000,
+	62084,
+	15545,
+	3862,
+	954,
+	238
+};
+
+struct adxl355_data {
+	struct regmap *regmap;
+	struct device *dev;
+	struct mutex lock; /* lock to protect op_mode */
+	enum adxl355_op_mode op_mode;
+	enum adxl355_odr odr;
+	enum adxl355_hpf_3db hpf_3db;
+	int x_calibbias;
+	int y_calibbias;
+	int z_calibbias;
+	int adxl355_hpf_3db_table[7][2];
+};
+
+static int adxl355_set_op_mode(struct adxl355_data *data,
+			       enum adxl355_op_mode op_mode)
+{
+	int ret;
+
+	if (data->op_mode == op_mode)
+		return 0;
+
+	ret = regmap_update_bits(data->regmap, ADXL355_POWER_CTL,
+				 ADXL355_POWER_CTL_MODE_MSK, op_mode);
+	if (ret < 0)
+		return ret;
+
+	data->op_mode = op_mode;
+
+	return ret;
+}
+
+static void adxl355_fill_3db_frequency_table(struct adxl355_data *data)
+{
+	int i;
+	u64 rem;
+	u64 div;
+	u32 multiplier;
+	u64 odr = mul_u64_u32_shr(adxl355_odr_table[data->odr][0], 1000000, 0) +
+					adxl355_odr_table[data->odr][1];
+
+	for (i = 0; i < ARRAY_SIZE(adxl355_hpf_3db_multipliers); i++) {
+		multiplier = adxl355_hpf_3db_multipliers[i];
+		div = div64_u64_rem(mul_u64_u32_shr(odr, multiplier, 0),
+				    100000000000000UL, &rem);
+
+		data->adxl355_hpf_3db_table[i][0] = div;
+		data->adxl355_hpf_3db_table[i][1] = div_u64(rem, 100000000);
+	}
+}
+
+static int adxl355_setup(struct adxl355_data *data)
+{
+	unsigned int regval;
+	int ret;
+
+	ret = regmap_read(data->regmap, ADXL355_DEVID_AD, &regval);
+	if (ret < 0)
+		return ret;
+
+	if (regval != ADXL355_DEVID_AD_VAL) {
+		dev_err(data->dev, "Invalid ADI ID 0x%02x\n", regval);
+		return -ENODEV;
+	}
+
+	ret = regmap_read(data->regmap, ADXL355_DEVID_MST, &regval);
+	if (ret < 0)
+		return ret;
+
+	if (regval != ADXL355_DEVID_MST_VAL) {
+		dev_err(data->dev, "Invalid MEMS ID 0x%02x\n", regval);
+		return -ENODEV;
+	}
+
+	ret = regmap_read(data->regmap, ADXL355_PARTID, &regval);
+	if (ret < 0)
+		return ret;
+
+	if (regval != ADXL355_PARTID_VAL) {
+		dev_err(data->dev, "Invalid DEV ID 0x%02x\n", regval);
+		return -ENODEV;
+	}
+
+	/*
+	 * Perform a software reset to make sure the device is in a consistent
+	 * state after start up.
+	 */
+	ret = regmap_write(data->regmap, ADXL355_RESET, ADXL355_RESET_CODE);
+	if (ret < 0)
+		return ret;
+
+	adxl355_fill_3db_frequency_table(data);
+
+	return adxl355_set_op_mode(data, ADXL355_MEASUREMENT);
+}
+
+static int adxl355_get_temp_data(struct adxl355_data *data,
+				 u8 addr, __be16 *out)
+{
+	return regmap_bulk_read(data->regmap, addr, out, sizeof(*out));
+}
+
+static int adxl355_read_axis(struct adxl355_data *data, u8 addr)
+{
+	__be32 regval;
+	int ret;
+
+	ret = regmap_bulk_read(data->regmap, addr, &regval, 3);
+	if (ret < 0)
+		return ret;
+
+	return be32_to_cpu(regval) >> 8;
+}
+
+static int adxl355_find_match(const int (*freq_tbl)[2], const int n,
+			      const int val, const int val2)
+{
+	int i;
+
+	for (i = 0; i < n; i++) {
+		if (freq_tbl[i][0] == val && freq_tbl[i][1] == val2)
+			return i;
+	}
+
+	return -EINVAL;
+}
+
+static int adxl355_set_odr(struct adxl355_data *data,
+			   enum adxl355_odr odr)
+{
+	int ret = 0;
+
+	mutex_lock(&data->lock);
+
+	if (data->odr == odr)
+		goto out_unlock;
+
+	ret = adxl355_set_op_mode(data, ADXL355_STANDBY);
+	if (ret < 0)
+		goto out_unlock;
+
+	ret = regmap_update_bits(data->regmap, ADXL355_FILTER,
+				 ADXL355_FILTER_ODR_MSK,
+				 ADXL355_FILTER_ODR_MODE(odr));
+	if (!ret) {
+		data->odr = odr;
+		adxl355_fill_3db_frequency_table(data);
+	}
+
+out_unlock:
+	ret = adxl355_set_op_mode(data, ADXL355_MEASUREMENT);
+	mutex_unlock(&data->lock);
+	return ret;
+}
+
+static int adxl355_set_hpf_3db(struct adxl355_data *data,
+			       enum adxl355_hpf_3db hpf)
+{
+	int ret = 0;
+
+	mutex_lock(&data->lock);
+
+	if (data->hpf_3db == hpf)
+		goto out_unlock;
+
+	ret = adxl355_set_op_mode(data, ADXL355_STANDBY);
+	if (ret < 0)
+		goto out_unlock;
+
+	ret = regmap_update_bits(data->regmap, ADXL355_FILTER,
+				 ADXL355_FILTER_HPF_MSK,
+				 ADXL355_FILTER_HPF_MODE(hpf));
+	if (!ret)
+		data->hpf_3db = hpf;
+
+out_unlock:
+	ret = adxl355_set_op_mode(data, ADXL355_MEASUREMENT);
+	mutex_unlock(&data->lock);
+	return ret;
+}
+
+static int adxl355_set_calibbias(struct adxl355_data *data,
+				 int scan_index, int calibbias)
+{
+	int ret = 0;
+	__be16 reg = cpu_to_be16(calibbias);
+
+	mutex_lock(&data->lock);
+
+	ret = adxl355_set_op_mode(data, ADXL355_STANDBY);
+	if (ret < 0)
+		goto out_unlock;
+
+	switch (scan_index) {
+	case 0:
+		ret = regmap_bulk_write(data->regmap, ADXL355_OFFSET_X_H,
+					&reg, 2);
+		if (ret < 0)
+			goto out_unlock;
+		data->x_calibbias = calibbias;
+		break;
+	case 1:
+		ret = regmap_bulk_write(data->regmap, ADXL355_OFFSET_Y_H,
+					&reg, 2);
+		if (ret < 0)
+			goto out_unlock;
+		data->y_calibbias = calibbias;
+		break;
+	case 2:
+		ret = regmap_bulk_write(data->regmap, ADXL355_OFFSET_Z_H,
+					&reg, 2);
+		if (ret < 0)
+			goto out_unlock;
+		data->z_calibbias = calibbias;
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+out_unlock:
+	ret = adxl355_set_op_mode(data, ADXL355_MEASUREMENT);
+	mutex_unlock(&data->lock);
+	return ret;
+}
+
+static int adxl355_read_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int *val, int *val2, long mask)
+{
+	struct adxl355_data *data = iio_priv(indio_dev);
+	int ret;
+	__be16 out;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		switch (chan->type) {
+		case IIO_TEMP:
+			ret = adxl355_get_temp_data(data, chan->address, &out);
+			if (ret < 0)
+				break;
+			*val = be16_to_cpu(out);
+			ret = IIO_VAL_INT;
+			break;
+
+		case IIO_ACCEL:
+			ret = adxl355_read_axis(data, chan->address);
+			if (ret < 0)
+				break;
+			*val = sign_extend32(ret >> (chan->scan_type.shift),
+					     chan->scan_type.realbits - 1);
+			ret = IIO_VAL_INT;
+			break;
+
+		default:
+			ret = -EINVAL;
+			break;
+		}
+
+		return ret;
+	case IIO_CHAN_INFO_SCALE:
+		switch (chan->type) {
+		case IIO_TEMP:
+			*val = TEMP_SCALE_VAL;
+			*val2 = TEMP_SCALE_VAL2;
+			return IIO_VAL_INT_PLUS_MICRO;
+		case IIO_ACCEL:
+			*val = 0;
+			*val2 = ADXL355_NSCALE;
+			return IIO_VAL_INT_PLUS_NANO;
+		default:
+			return -EINVAL;
+		}
+	case IIO_CHAN_INFO_OFFSET:
+		*val = TEMP_OFFSET_VAL;
+		*val2 = TEMP_OFFSET_VAL2;
+		return IIO_VAL_INT_PLUS_MICRO;
+	case IIO_CHAN_INFO_CALIBBIAS:
+		if (chan->scan_index == 0)
+			*val = data->x_calibbias;
+		else if (chan->scan_index == 1)
+			*val = data->y_calibbias;
+		else
+			*val = data->z_calibbias;
+		*val = sign_extend32(*val, 15);
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		*val = adxl355_odr_table[data->odr][0];
+		*val2 = adxl355_odr_table[data->odr][1];
+		return IIO_VAL_INT_PLUS_MICRO;
+	case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
+		*val = data->adxl355_hpf_3db_table[data->hpf_3db][0];
+		*val2 = data->adxl355_hpf_3db_table[data->hpf_3db][1];
+		return IIO_VAL_INT_PLUS_MICRO;
+	}
+	return -EINVAL;
+}
+
+static int adxl355_write_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan,
+			     int val, int val2, long mask)
+{
+	struct adxl355_data *data = iio_priv(indio_dev);
+	int odr_idx, hpf_idx, calibbias;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		odr_idx = adxl355_find_match(adxl355_odr_table,
+					     ARRAY_SIZE(adxl355_odr_table),
+					     val, val2);
+		if (odr_idx < 0)
+			return odr_idx;
+
+		return adxl355_set_odr(data, odr_idx);
+	case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
+		hpf_idx = adxl355_find_match(data->adxl355_hpf_3db_table,
+					ARRAY_SIZE(data->adxl355_hpf_3db_table),
+					     val, val2);
+		if (hpf_idx < 0)
+			return hpf_idx;
+
+		return adxl355_set_hpf_3db(data, hpf_idx);
+	case IIO_CHAN_INFO_CALIBBIAS:
+		calibbias = clamp_t(int, val, S16_MIN, S16_MAX);
+
+		return adxl355_set_calibbias(data, chan->scan_index, calibbias);
+	default:
+		return -EINVAL;
+	}
+}
+
+static int adxl355_read_avail(struct iio_dev *indio_dev,
+			      struct iio_chan_spec const *chan,
+			      const int **vals, int *type, int *length,
+			      long mask)
+{
+	struct adxl355_data *data = iio_priv(indio_dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		*vals = (const int *)adxl355_odr_table;
+		*type = IIO_VAL_INT_PLUS_MICRO;
+		/* Values are stored in a 2D matrix */
+		*length = ARRAY_SIZE(adxl355_odr_table) * 2;
+
+		return IIO_AVAIL_LIST;
+	case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
+		*vals = (const int *)(data->adxl355_hpf_3db_table);
+		*type = IIO_VAL_INT_PLUS_MICRO;
+		/* Values are stored in a 2D matrix */
+		*length = ARRAY_SIZE(data->adxl355_hpf_3db_table) * 2;
+
+		return IIO_AVAIL_LIST;
+	default:
+		return -EINVAL;
+	}
+}
+
+static const unsigned long adxl355_avail_scan_masks[] = {
+	GENMASK(3, 0),
+	0
+};
+
+static const struct iio_info adxl355_info = {
+	.read_raw	= adxl355_read_raw,
+	.write_raw	= adxl355_write_raw,
+	.read_avail	= &adxl355_read_avail
+};
+
+#define ADXL355_ACCEL_CHANNEL(index, reg, axis) {			\
+	.type = IIO_ACCEL,						\
+	.address = reg,							\
+	.modified = 1,							\
+	.channel2 = IIO_MOD_##axis,					\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |			\
+			      BIT(IIO_CHAN_INFO_CALIBBIAS),		\
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |		\
+				    BIT(IIO_CHAN_INFO_SAMP_FREQ) |	\
+		BIT(IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY),	\
+	.info_mask_shared_by_type_available =				\
+		BIT(IIO_CHAN_INFO_SAMP_FREQ) |				\
+		BIT(IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY),	\
+	.scan_index = index,						\
+	.scan_type = {							\
+		.sign = 's',						\
+		.realbits = 20,						\
+		.storagebits = 32,					\
+		.shift = 4,						\
+		.endianness = IIO_BE,					\
+	}								\
+}
+
+static const struct iio_chan_spec adxl355_channels[] = {
+	ADXL355_ACCEL_CHANNEL(0, ADXL355_XDATA3, X),
+	ADXL355_ACCEL_CHANNEL(1, ADXL355_YDATA3, Y),
+	ADXL355_ACCEL_CHANNEL(2, ADXL355_ZDATA3, Z),
+	{
+		.type = IIO_TEMP,
+		.address = ADXL355_TEMP2,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE) |
+				      BIT(IIO_CHAN_INFO_OFFSET),
+		.scan_index = 3,
+		.scan_type = {
+			.sign = 's',
+			.realbits = 12,
+			.storagebits = 16,
+			.endianness = IIO_BE,
+		},
+	}
+};
+
+int adxl355_core_probe(struct device *dev, struct regmap *regmap,
+		       const char *name)
+{
+	struct adxl355_data *data;
+	struct iio_dev *indio_dev;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	data = iio_priv(indio_dev);
+	data->regmap = regmap;
+	data->dev = dev;
+	data->op_mode = ADXL355_STANDBY;
+	mutex_init(&data->lock);
+
+	indio_dev->name = name;
+	indio_dev->info = &adxl355_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = adxl355_channels;
+	indio_dev->num_channels = ARRAY_SIZE(adxl355_channels);
+	indio_dev->available_scan_masks = adxl355_avail_scan_masks;
+
+	ret = adxl355_setup(data);
+	if (ret < 0) {
+		dev_err(dev, "ADXL355 setup failed\n");
+		return ret;
+	}
+
+	return devm_iio_device_register(dev, indio_dev);
+}
+EXPORT_SYMBOL_GPL(adxl355_core_probe);
+
+MODULE_AUTHOR("Puranjay Mohan <puranjay12@gmail.com>");
+MODULE_DESCRIPTION("ADXL355 3-Axis Digital Accelerometer core driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/accel/adxl355_i2c.c b/drivers/iio/accel/adxl355_i2c.c
new file mode 100644
index 000000000..1c9764129
--- /dev/null
+++ b/drivers/iio/accel/adxl355_i2c.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ADXL355 3-Axis Digital Accelerometer I2C driver
+ *
+ * Copyright (c) 2021 Puranjay Mohan <puranjay12@gmail.com>
+ */
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+#include "adxl355.h"
+
+static const struct regmap_config adxl355_i2c_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = 0x2F,
+	.rd_table = &adxl355_readable_regs_tbl,
+	.wr_table = &adxl355_writeable_regs_tbl
+};
+
+static int adxl355_i2c_probe(struct i2c_client *client)
+{
+	struct regmap *regmap;
+
+	regmap = devm_regmap_init_i2c(client, &adxl355_i2c_regmap_config);
+	if (IS_ERR(regmap)) {
+		dev_err(&client->dev, "Error initializing i2c regmap: %ld\n",
+			PTR_ERR(regmap));
+		return PTR_ERR(regmap);
+	}
+
+	return adxl355_core_probe(&client->dev, regmap, client->name);
+}
+
+static const struct i2c_device_id adxl355_i2c_id[] = {
+	{ "adxl355", 0 },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(i2c, adxl355_i2c_id);
+
+static const struct of_device_id adxl355_of_match[] = {
+	{ .compatible = "adi,adxl355" },
+	{ },
+};
+
+MODULE_DEVICE_TABLE(of, adxl355_of_match);
+
+static struct i2c_driver adxl355_i2c_driver = {
+	.driver = {
+		.name	= "adxl355_i2c",
+		.of_match_table = adxl355_of_match,
+	},
+	.probe_new	= adxl355_i2c_probe,
+	.id_table	= adxl355_i2c_id,
+};
+
+module_i2c_driver(adxl355_i2c_driver);
+
+MODULE_AUTHOR("Puranjay Mohan <puranjay12@gmail.com>");
+MODULE_DESCRIPTION("ADXL355 3-Axis Digital Accelerometer I2C driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/accel/adxl355_spi.c b/drivers/iio/accel/adxl355_spi.c
new file mode 100644
index 000000000..ae02cbfad
--- /dev/null
+++ b/drivers/iio/accel/adxl355_spi.c
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ADXL355 3-Axis Digital Accelerometer SPI driver
+ *
+ * Copyright (c) 2021 Puranjay Mohan <puranjay12@gmail.com>
+ */
+
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+
+#include "adxl355.h"
+
+static const struct regmap_config adxl355_spi_regmap_config = {
+	.reg_bits = 7,
+	.pad_bits = 1,
+	.val_bits = 8,
+	.read_flag_mask = BIT(0),
+	.max_register = 0x2F,
+	.rd_table = &adxl355_readable_regs_tbl,
+	.wr_table = &adxl355_writeable_regs_tbl
+};
+
+static int adxl355_spi_probe(struct spi_device *spi)
+{
+	const struct spi_device_id *id = spi_get_device_id(spi);
+	struct regmap *regmap;
+
+	regmap = devm_regmap_init_spi(spi, &adxl355_spi_regmap_config);
+	if (IS_ERR(regmap)) {
+		dev_err(&spi->dev, "Error initializing spi regmap: %ld\n",
+			PTR_ERR(regmap));
+		return PTR_ERR(regmap);
+	}
+
+	return adxl355_core_probe(&spi->dev, regmap, id->name);
+}
+
+static const struct spi_device_id adxl355_spi_id[] = {
+	{ "adxl355", 0 },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(spi, adxl355_spi_id);
+
+static const struct of_device_id adxl355_of_match[] = {
+	{ .compatible = "adi,adxl355" },
+	{ },
+};
+
+MODULE_DEVICE_TABLE(of, adxl355_of_match);
+
+static struct spi_driver adxl355_spi_driver = {
+	.driver = {
+		.name	= "adxl355_spi",
+		.of_match_table = adxl355_of_match,
+	},
+	.probe		= adxl355_spi_probe,
+	.id_table	= adxl355_spi_id,
+};
+
+module_spi_driver(adxl355_spi_driver);
+
+MODULE_AUTHOR("Puranjay Mohan <puranjay12@gmail.com>");
+MODULE_DESCRIPTION("ADXL355 3-Axis Digital Accelerometer SPI driver");
+MODULE_LICENSE("GPL v2");
-- 
2.30.1

Re: [PATCH v1 2/2] iio: accel: Add driver support for ADXL355

[Alexandru Ardelean]

On Wed, Jul 21, 2021 at 1:24 PM Puranjay Mohan <puranjay12@gmail.com> wrote:
>
> ADXL355 is 3-axis MEMS Accelerometer. It offers low noise density,
> low 0g offset drift, low power with selectable measurement ranges.
> It also features programmable high-pass and low-pass filters.
>

This looks like V2.
A few notes inline.

This looks a bit better than the previous version :)

One general thing is that this driver can also support adxl354, with
some adjustment.
But that can be added later.

> Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/adxl354_adxl355.pdf
> Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
> ---
>  MAINTAINERS                      |   7 +
>  drivers/iio/accel/Kconfig        |  29 ++
>  drivers/iio/accel/Makefile       |   3 +
>  drivers/iio/accel/adxl355.h      |  83 +++++
>  drivers/iio/accel/adxl355_core.c | 541 +++++++++++++++++++++++++++++++
>  drivers/iio/accel/adxl355_i2c.c  |  63 ++++
>  drivers/iio/accel/adxl355_spi.c  |  66 ++++
>  7 files changed, 792 insertions(+)
>  create mode 100644 drivers/iio/accel/adxl355.h
>  create mode 100644 drivers/iio/accel/adxl355_core.c
>  create mode 100644 drivers/iio/accel/adxl355_i2c.c
>  create mode 100644 drivers/iio/accel/adxl355_spi.c
>

Some people like to see a changelog here of what was changed

> diff --git a/MAINTAINERS b/MAINTAINERS
> index bd7aff0c1..461f2a192 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -586,6 +586,13 @@ W: http://ez.analog.com/community/linux-device-drivers
>  F:     Documentation/devicetree/bindings/iio/accel/adi,adxl345.yaml
>  F:     drivers/input/misc/adxl34x.c
>
> +ADXL355 THREE-AXIS DIGITAL ACCELEROMETER DRIVER
> +M:     Puranjay Mohan <puranjay12@gmail.com>
> +L:     linux-iio@vger.kernel.org
> +S:     Supported
> +F:     drivers/iio/accel/adxl34x.c
> +F:     Documentation/devicetree/bindings/iio/accel/adi,adxl355.yaml
> +
>  ADXL372 THREE-AXIS DIGITAL ACCELEROMETER DRIVER
>  M:     Michael Hennerich <michael.hennerich@analog.com>
>  S:     Supported
> diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
> index cceda3cec..9a65353a4 100644
> --- a/drivers/iio/accel/Kconfig
> +++ b/drivers/iio/accel/Kconfig
> @@ -61,6 +61,35 @@ config ADXL345_SPI
>           will be called adxl345_spi and you will also get adxl345_core
>           for the core module.
>
> +config ADXL355
> +       tristate
> +
> +config ADXL355_I2C
> +       tristate "Analog Devices ADXL355 3-Axis Digital Accelerometer I2C Driver"
> +       depends on I2C
> +       select ADXL355
> +       select REGMAP_I2C
> +       help
> +         Say Y here if you want to build support for the Analog Devices
> +         ADXL355 3-axis digital accelerometer.
> +
> +         To compile this driver as a module, choose M here: the module
> +         will be called adxl355_i2c and you will also get adxl355_core
> +         for the core module.
> +
> +config ADXL355_SPI
> +       tristate "Analog Devices ADXL355 3-Axis Digital Accelerometer SPI Driver"
> +       depends on SPI
> +       select ADXL355
> +       select REGMAP_SPI
> +       help
> +         Say Y here if you want to build support for the Analog Devices
> +         ADXL355 3-axis digital accelerometer.
> +
> +         To compile this driver as a module, choose M here: the module
> +         will be called adxl355_spi and you will also get adxl355_core
> +         for the core module.
> +
>  config ADXL372
>         tristate
>         select IIO_BUFFER
> diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
> index 32cd1342a..0e4721d2d 100644
> --- a/drivers/iio/accel/Makefile
> +++ b/drivers/iio/accel/Makefile
> @@ -9,6 +9,9 @@ obj-$(CONFIG_ADIS16209) += adis16209.o
>  obj-$(CONFIG_ADXL345) += adxl345_core.o
>  obj-$(CONFIG_ADXL345_I2C) += adxl345_i2c.o
>  obj-$(CONFIG_ADXL345_SPI) += adxl345_spi.o
> +obj-$(CONFIG_ADXL355) += adxl355_core.o
> +obj-$(CONFIG_ADXL355_I2C) += adxl355_i2c.o
> +obj-$(CONFIG_ADXL355_SPI) += adxl355_spi.o
>  obj-$(CONFIG_ADXL372) += adxl372.o
>  obj-$(CONFIG_ADXL372_I2C) += adxl372_i2c.o
>  obj-$(CONFIG_ADXL372_SPI) += adxl372_spi.o
> diff --git a/drivers/iio/accel/adxl355.h b/drivers/iio/accel/adxl355.h
> new file mode 100644
> index 000000000..e52c294d8
> --- /dev/null
> +++ b/drivers/iio/accel/adxl355.h
> @@ -0,0 +1,83 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * ADXL355 3-Axis Digital Accelerometer
> + *
> + * Copyright (c) 2021 Puranjay Mohan <puranjay12@gmail.com>
> + */
> +
> +#ifndef _ADXL355_H_
> +#define _ADXL355_H_
> +
> +#include <linux/regmap.h>
> +
> +/* ADXL355 Register Definitions */
> +#define ADXL355_DEVID_AD       0x00
> +#define ADXL355_DEVID_MST      0x01
> +#define ADXL355_PARTID         0x02
> +#define ADXL355_REVID          0x03
> +#define ADXL355_STATUS         0x04
> +#define ADXL355_FIFO_ENTRIES   0x05
> +#define ADXL355_TEMP2          0x06
> +#define ADXL355_XDATA3         0x08
> +#define ADXL355_YDATA3         0x0B
> +#define ADXL355_ZDATA3         0x0E
> +#define ADXL355_FIFO_DATA      0x11
> +#define ADXL355_OFFSET_X_H     0x1E
> +#define ADXL355_OFFSET_Y_H     0x20
> +#define ADXL355_OFFSET_Z_H     0x22
> +#define ADXL355_ACT_EN         0x24
> +#define ADXL355_ACT_THRESH_H   0x25
> +#define ADXL355_ACT_THRESH_L   0x26
> +#define ADXL355_ACT_COUNT      0x27
> +#define ADXL355_FILTER         0x28
> +#define ADXL355_FIFO_SAMPLES   0x29
> +#define ADXL355_INT_MAP                0x2A
> +#define ADXL355_SYNC           0x2B
> +#define ADXL355_RANGE          0x2C
> +#define ADXL355_POWER_CTL      0x2D
> +#define ADXL355_SELF_TEST      0x2E
> +#define ADXL355_RESET          0x2F
> +
> +#define ADXL355_DEVID_AD_VAL   0xAD
> +#define ADXL355_DEVID_MST_VAL  0x1D
> +#define ADXL355_PARTID_VAL     0xED
> +#define ADXL355_REVID_VAL      0x01
> +#define ADXL355_RESET_CODE     0x52
> +
> +#define ADXL355_POWER_CTL_MODE_MSK     GENMASK(1, 0)
> +
> +#define ADXL355_FILTER_ODR_MSK                 GENMASK(3, 0)
> +#define ADXL355_FILTER_ODR_MODE(x)             ((x) & 0xF)
> +#define ADXL355_FILTER_HPF_MSK                 GENMASK(6, 4)
> +#define ADXL355_FILTER_HPF_MODE(x)             (((x) & 0x7) << 4)
> +
> +/*
> + * The datasheet defines an intercept of 1885 LSB at 25 degC
> + * and a slope of -9.05 LSB/C. The following formula can be used to find the
> + * temperature:
> + * Temp = ((RAW - 1885)/(-9.05)) + 25 but this doesn't follow the format of
> + * the IIO which is Temp = (RAW + OFFSET) * SCALE. Hence using some rearranging
> + * we get the scale as -110.49723 and offset as -2111.25
> + */
> +#define TEMP_SCALE_VAL -110
> +#define TEMP_SCALE_VAL2 497238
> +#define TEMP_OFFSET_VAL -2111
> +#define TEMP_OFFSET_VAL2 250000
> +
> +/*
> + * At +/- 2g with 20-bit resolution, scale is given in datasheet as
> + * 3.9ug/LSB = 0.0000039 * 9.80665 = 0.00003824593 m/s^2
> + */
> +#define ADXL355_NSCALE 38245
> +
> +extern const struct regmap_range adxl355_read_reg_range[];

This likely fails because adxl355_read_reg_range is re-defined as static.

> +
> +extern const struct regmap_access_table adxl355_readable_regs_tbl;
> +
> +extern const struct regmap_range adxl355_write_reg_range[];
> +
> +extern const struct regmap_access_table adxl355_writeable_regs_tbl;
> +
> +int adxl355_core_probe(struct device *dev, struct regmap *regmap,
> +                      const char *name);
> +#endif /* _ADXL355_H_ */
> diff --git a/drivers/iio/accel/adxl355_core.c b/drivers/iio/accel/adxl355_core.c
> new file mode 100644
> index 000000000..ff90e5aa6
> --- /dev/null
> +++ b/drivers/iio/accel/adxl355_core.c
> @@ -0,0 +1,541 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * ADXL355 3-Axis Digital Accelerometer IIO core driver
> + *
> + * Copyright (c) 2021 Puranjay Mohan <puranjay12@gmail.com>
> + *
> + * Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/adxl354_adxl355.pdf
> + */
> +
> +#include <linux/iio/iio.h>
> +#include <linux/iio/sysfs.h>
> +#include <linux/limits.h>
> +#include <linux/math64.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +
> +#include "adxl355.h"
> +
> +static const struct regmap_range adxl355_read_reg_range[] = {
> +       regmap_reg_range(ADXL355_DEVID_AD, ADXL355_FIFO_DATA),
> +       regmap_reg_range(ADXL355_OFFSET_X_H, ADXL355_SELF_TEST)
> +};
> +
> +const struct regmap_access_table adxl355_readable_regs_tbl = {
> +       .yes_ranges = adxl355_read_reg_range,
> +       .n_yes_ranges = ARRAY_SIZE(adxl355_read_reg_range),
> +};
> +EXPORT_SYMBOL_GPL(adxl355_readable_regs_tbl);
> +
> +static const struct regmap_range adxl355_write_reg_range[] = {
> +       regmap_reg_range(ADXL355_OFFSET_X_H, ADXL355_RESET)
> +};
> +
> +const struct regmap_access_table adxl355_writeable_regs_tbl = {
> +       .yes_ranges = adxl355_write_reg_range,
> +       .n_yes_ranges = ARRAY_SIZE(adxl355_write_reg_range),
> +};
> +EXPORT_SYMBOL_GPL(adxl355_writeable_regs_tbl);
> +
> +enum adxl355_op_mode {
> +       ADXL355_MEASUREMENT,
> +       ADXL355_STANDBY,
> +       ADXL355_TEMP_OFF
> +};
> +
> +enum adxl355_odr {
> +       ADXL355_ODR_4000HZ,
> +       ADXL355_ODR_2000HZ,
> +       ADXL355_ODR_1000HZ,
> +       ADXL355_ODR_500HZ,
> +       ADXL355_ODR_250HZ,
> +       ADXL355_ODR_125HZ,
> +       ADXL355_ODR_62_5HZ,
> +       ADXL355_ODR_31_25HZ,
> +       ADXL355_ODR_15_625HZ,
> +       ADXL355_ODR_7_813HZ,
> +       ADXL355_ODR_3_906HZ
> +};
> +
> +enum adxl355_hpf_3db {
> +       ADXL355_HPF_OFF,
> +       ADXL355_HPF_24_7,
> +       ADXL355_HPF_6_2084,
> +       ADXL355_HPF_1_5545,
> +       ADXL355_HPF_0_3862,
> +       ADXL355_HPF_0_0954,
> +       ADXL355_HPF_0_0238
> +};
> +
> +static const int adxl355_odr_table[][2] = {
> +       [0] = {4000, 0},
> +       [1] = {2000, 0},
> +       [2] = {1000, 0},
> +       [3] = {500, 0},
> +       [4] = {250, 0},
> +       [5] = {125, 0},
> +       [6] = {62, 500000},
> +       [7] = {31, 250000},
> +       [8] = {15, 625000},
> +       [9] = {7, 813000},
> +       [10] = {3, 906000}
> +};
> +
> +static const int adxl355_hpf_3db_multipliers[] = {
> +       0,
> +       247000,
> +       62084,
> +       15545,
> +       3862,
> +       954,
> +       238
> +};
> +
> +struct adxl355_data {
> +       struct regmap *regmap;
> +       struct device *dev;
> +       struct mutex lock; /* lock to protect op_mode */
> +       enum adxl355_op_mode op_mode;
> +       enum adxl355_odr odr;
> +       enum adxl355_hpf_3db hpf_3db;
> +       int x_calibbias;
> +       int y_calibbias;
> +       int z_calibbias;
> +       int adxl355_hpf_3db_table[7][2];
> +};
> +
> +static int adxl355_set_op_mode(struct adxl355_data *data,
> +                              enum adxl355_op_mode op_mode)
> +{
> +       int ret;
> +
> +       if (data->op_mode == op_mode)
> +               return 0;
> +
> +       ret = regmap_update_bits(data->regmap, ADXL355_POWER_CTL,
> +                                ADXL355_POWER_CTL_MODE_MSK, op_mode);
> +       if (ret < 0)
> +               return ret;
> +
> +       data->op_mode = op_mode;
> +
> +       return ret;
> +}
> +
> +static void adxl355_fill_3db_frequency_table(struct adxl355_data *data)
> +{
> +       int i;
> +       u64 rem;
> +       u64 div;
> +       u32 multiplier;
> +       u64 odr = mul_u64_u32_shr(adxl355_odr_table[data->odr][0], 1000000, 0) +
> +                                       adxl355_odr_table[data->odr][1];
> +
> +       for (i = 0; i < ARRAY_SIZE(adxl355_hpf_3db_multipliers); i++) {
> +               multiplier = adxl355_hpf_3db_multipliers[i];
> +               div = div64_u64_rem(mul_u64_u32_shr(odr, multiplier, 0),
> +                                   100000000000000UL, &rem);
> +
> +               data->adxl355_hpf_3db_table[i][0] = div;
> +               data->adxl355_hpf_3db_table[i][1] = div_u64(rem, 100000000);
> +       }
> +}
> +
> +static int adxl355_setup(struct adxl355_data *data)
> +{
> +       unsigned int regval;
> +       int ret;
> +
> +       ret = regmap_read(data->regmap, ADXL355_DEVID_AD, &regval);
> +       if (ret < 0)
> +               return ret;
> +
> +       if (regval != ADXL355_DEVID_AD_VAL) {
> +               dev_err(data->dev, "Invalid ADI ID 0x%02x\n", regval);
> +               return -ENODEV;
> +       }
> +
> +       ret = regmap_read(data->regmap, ADXL355_DEVID_MST, &regval);
> +       if (ret < 0)
> +               return ret;
> +
> +       if (regval != ADXL355_DEVID_MST_VAL) {
> +               dev_err(data->dev, "Invalid MEMS ID 0x%02x\n", regval);
> +               return -ENODEV;
> +       }
> +
> +       ret = regmap_read(data->regmap, ADXL355_PARTID, &regval);
> +       if (ret < 0)
> +               return ret;
> +
> +       if (regval != ADXL355_PARTID_VAL) {
> +               dev_err(data->dev, "Invalid DEV ID 0x%02x\n", regval);
> +               return -ENODEV;
> +       }
> +
> +       /*
> +        * Perform a software reset to make sure the device is in a consistent
> +        * state after start up.
> +        */
> +       ret = regmap_write(data->regmap, ADXL355_RESET, ADXL355_RESET_CODE);
> +       if (ret < 0)
> +               return ret;
> +
> +       adxl355_fill_3db_frequency_table(data);
> +
> +       return adxl355_set_op_mode(data, ADXL355_MEASUREMENT);
> +}
> +
> +static int adxl355_get_temp_data(struct adxl355_data *data,
> +                                u8 addr, __be16 *out)
> +{
> +       return regmap_bulk_read(data->regmap, addr, out, sizeof(*out));
> +}
> +
> +static int adxl355_read_axis(struct adxl355_data *data, u8 addr)
> +{
> +       __be32 regval;
> +       int ret;
> +
> +       ret = regmap_bulk_read(data->regmap, addr, &regval, 3);
> +       if (ret < 0)
> +               return ret;
> +
> +       return be32_to_cpu(regval) >> 8;
> +}
> +
> +static int adxl355_find_match(const int (*freq_tbl)[2], const int n,
> +                             const int val, const int val2)
> +{
> +       int i;
> +
> +       for (i = 0; i < n; i++) {
> +               if (freq_tbl[i][0] == val && freq_tbl[i][1] == val2)
> +                       return i;
> +       }
> +
> +       return -EINVAL;
> +}
> +
> +static int adxl355_set_odr(struct adxl355_data *data,
> +                          enum adxl355_odr odr)
> +{
> +       int ret = 0;
> +
> +       mutex_lock(&data->lock);
> +
> +       if (data->odr == odr)
> +               goto out_unlock;
> +
> +       ret = adxl355_set_op_mode(data, ADXL355_STANDBY);
> +       if (ret < 0)
> +               goto out_unlock;
> +
> +       ret = regmap_update_bits(data->regmap, ADXL355_FILTER,
> +                                ADXL355_FILTER_ODR_MSK,
> +                                ADXL355_FILTER_ODR_MODE(odr));
> +       if (!ret) {
> +               data->odr = odr;
> +               adxl355_fill_3db_frequency_table(data);
> +       }
> +
> +out_unlock:
> +       ret = adxl355_set_op_mode(data, ADXL355_MEASUREMENT);
> +       mutex_unlock(&data->lock);
> +       return ret;
> +}
> +
> +static int adxl355_set_hpf_3db(struct adxl355_data *data,
> +                              enum adxl355_hpf_3db hpf)
> +{
> +       int ret = 0;
> +
> +       mutex_lock(&data->lock);
> +
> +       if (data->hpf_3db == hpf)
> +               goto out_unlock;
> +
> +       ret = adxl355_set_op_mode(data, ADXL355_STANDBY);
> +       if (ret < 0)
> +               goto out_unlock;
> +
> +       ret = regmap_update_bits(data->regmap, ADXL355_FILTER,
> +                                ADXL355_FILTER_HPF_MSK,
> +                                ADXL355_FILTER_HPF_MODE(hpf));
> +       if (!ret)
> +               data->hpf_3db = hpf;
> +
> +out_unlock:
> +       ret = adxl355_set_op_mode(data, ADXL355_MEASUREMENT);
> +       mutex_unlock(&data->lock);
> +       return ret;
> +}
> +
> +static int adxl355_set_calibbias(struct adxl355_data *data,
> +                                int scan_index, int calibbias)
> +{
> +       int ret = 0;
> +       __be16 reg = cpu_to_be16(calibbias);
> +
> +       mutex_lock(&data->lock);
> +
> +       ret = adxl355_set_op_mode(data, ADXL355_STANDBY);
> +       if (ret < 0)
> +               goto out_unlock;
> +
> +       switch (scan_index) {
> +       case 0:
> +               ret = regmap_bulk_write(data->regmap, ADXL355_OFFSET_X_H,
> +                                       &reg, 2);
> +               if (ret < 0)
> +                       goto out_unlock;
> +               data->x_calibbias = calibbias;
> +               break;
> +       case 1:
> +               ret = regmap_bulk_write(data->regmap, ADXL355_OFFSET_Y_H,
> +                                       &reg, 2);
> +               if (ret < 0)
> +                       goto out_unlock;
> +               data->y_calibbias = calibbias;
> +               break;
> +       case 2:
> +               ret = regmap_bulk_write(data->regmap, ADXL355_OFFSET_Z_H,
> +                                       &reg, 2);
> +               if (ret < 0)
> +                       goto out_unlock;
> +               data->z_calibbias = calibbias;
> +               break;
> +       default:
> +               ret = -EINVAL;
> +               break;
> +       }
> +
> +out_unlock:
> +       ret = adxl355_set_op_mode(data, ADXL355_MEASUREMENT);
> +       mutex_unlock(&data->lock);
> +       return ret;
> +}
> +
> +static int adxl355_read_raw(struct iio_dev *indio_dev,
> +                           struct iio_chan_spec const *chan,
> +                           int *val, int *val2, long mask)
> +{
> +       struct adxl355_data *data = iio_priv(indio_dev);
> +       int ret;
> +       __be16 out;
> +
> +       switch (mask) {
> +       case IIO_CHAN_INFO_RAW:
> +               switch (chan->type) {
> +               case IIO_TEMP:
> +                       ret = adxl355_get_temp_data(data, chan->address, &out);
> +                       if (ret < 0)
> +                               break;
> +                       *val = be16_to_cpu(out);
> +                       ret = IIO_VAL_INT;
> +                       break;
> +
> +               case IIO_ACCEL:
> +                       ret = adxl355_read_axis(data, chan->address);
> +                       if (ret < 0)
> +                               break;
> +                       *val = sign_extend32(ret >> (chan->scan_type.shift),
> +                                            chan->scan_type.realbits - 1);
> +                       ret = IIO_VAL_INT;
> +                       break;
> +
> +               default:
> +                       ret = -EINVAL;
> +                       break;

Since this will get an update anyway.
This switch statement could be replaced with direct  return -EINVAL and similar.
Other switch statements seem to do it.
It would make this consistent with the other below.

> +               }
> +
> +               return ret;
> +       case IIO_CHAN_INFO_SCALE:
> +               switch (chan->type) {
> +               case IIO_TEMP:
> +                       *val = TEMP_SCALE_VAL;
> +                       *val2 = TEMP_SCALE_VAL2;
> +                       return IIO_VAL_INT_PLUS_MICRO;
> +               case IIO_ACCEL:
> +                       *val = 0;
> +                       *val2 = ADXL355_NSCALE;
> +                       return IIO_VAL_INT_PLUS_NANO;
> +               default:
> +                       return -EINVAL;
> +               }
> +       case IIO_CHAN_INFO_OFFSET:
> +               *val = TEMP_OFFSET_VAL;
> +               *val2 = TEMP_OFFSET_VAL2;
> +               return IIO_VAL_INT_PLUS_MICRO;
> +       case IIO_CHAN_INFO_CALIBBIAS:
> +               if (chan->scan_index == 0)
> +                       *val = data->x_calibbias;
> +               else if (chan->scan_index == 1)
> +                       *val = data->y_calibbias;
> +               else
> +                       *val = data->z_calibbias;
> +               *val = sign_extend32(*val, 15);
> +               return IIO_VAL_INT;
> +       case IIO_CHAN_INFO_SAMP_FREQ:
> +               *val = adxl355_odr_table[data->odr][0];
> +               *val2 = adxl355_odr_table[data->odr][1];
> +               return IIO_VAL_INT_PLUS_MICRO;
> +       case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
> +               *val = data->adxl355_hpf_3db_table[data->hpf_3db][0];
> +               *val2 = data->adxl355_hpf_3db_table[data->hpf_3db][1];
> +               return IIO_VAL_INT_PLUS_MICRO;
> +       }
> +       return -EINVAL;
> +}
> +
> +static int adxl355_write_raw(struct iio_dev *indio_dev,
> +                            struct iio_chan_spec const *chan,
> +                            int val, int val2, long mask)
> +{
> +       struct adxl355_data *data = iio_priv(indio_dev);
> +       int odr_idx, hpf_idx, calibbias;
> +
> +       switch (mask) {
> +       case IIO_CHAN_INFO_SAMP_FREQ:
> +               odr_idx = adxl355_find_match(adxl355_odr_table,
> +                                            ARRAY_SIZE(adxl355_odr_table),
> +                                            val, val2);
> +               if (odr_idx < 0)
> +                       return odr_idx;
> +
> +               return adxl355_set_odr(data, odr_idx);
> +       case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
> +               hpf_idx = adxl355_find_match(data->adxl355_hpf_3db_table,
> +                                       ARRAY_SIZE(data->adxl355_hpf_3db_table),
> +                                            val, val2);
> +               if (hpf_idx < 0)
> +                       return hpf_idx;
> +
> +               return adxl355_set_hpf_3db(data, hpf_idx);
> +       case IIO_CHAN_INFO_CALIBBIAS:
> +               calibbias = clamp_t(int, val, S16_MIN, S16_MAX);
> +
> +               return adxl355_set_calibbias(data, chan->scan_index, calibbias);
> +       default:
> +               return -EINVAL;
> +       }
> +}
> +
> +static int adxl355_read_avail(struct iio_dev *indio_dev,
> +                             struct iio_chan_spec const *chan,
> +                             const int **vals, int *type, int *length,
> +                             long mask)
> +{
> +       struct adxl355_data *data = iio_priv(indio_dev);
> +
> +       switch (mask) {
> +       case IIO_CHAN_INFO_SAMP_FREQ:
> +               *vals = (const int *)adxl355_odr_table;
> +               *type = IIO_VAL_INT_PLUS_MICRO;
> +               /* Values are stored in a 2D matrix */
> +               *length = ARRAY_SIZE(adxl355_odr_table) * 2;
> +
> +               return IIO_AVAIL_LIST;
> +       case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
> +               *vals = (const int *)(data->adxl355_hpf_3db_table);
> +               *type = IIO_VAL_INT_PLUS_MICRO;
> +               /* Values are stored in a 2D matrix */
> +               *length = ARRAY_SIZE(data->adxl355_hpf_3db_table) * 2;
> +
> +               return IIO_AVAIL_LIST;
> +       default:
> +               return -EINVAL;
> +       }
> +}
> +
> +static const unsigned long adxl355_avail_scan_masks[] = {
> +       GENMASK(3, 0),
> +       0
> +};
> +
> +static const struct iio_info adxl355_info = {
> +       .read_raw       = adxl355_read_raw,
> +       .write_raw      = adxl355_write_raw,
> +       .read_avail     = &adxl355_read_avail
> +};
> +
> +#define ADXL355_ACCEL_CHANNEL(index, reg, axis) {                      \
> +       .type = IIO_ACCEL,                                              \
> +       .address = reg,                                                 \
> +       .modified = 1,                                                  \
> +       .channel2 = IIO_MOD_##axis,                                     \
> +       .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |                  \
> +                             BIT(IIO_CHAN_INFO_CALIBBIAS),             \
> +       .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |          \
> +                                   BIT(IIO_CHAN_INFO_SAMP_FREQ) |      \
> +               BIT(IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY),      \
> +       .info_mask_shared_by_type_available =                           \
> +               BIT(IIO_CHAN_INFO_SAMP_FREQ) |                          \
> +               BIT(IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY),      \
> +       .scan_index = index,                                            \
> +       .scan_type = {                                                  \
> +               .sign = 's',                                            \
> +               .realbits = 20,                                         \
> +               .storagebits = 32,                                      \
> +               .shift = 4,                                             \
> +               .endianness = IIO_BE,                                   \
> +       }                                                               \
> +}
> +
> +static const struct iio_chan_spec adxl355_channels[] = {
> +       ADXL355_ACCEL_CHANNEL(0, ADXL355_XDATA3, X),
> +       ADXL355_ACCEL_CHANNEL(1, ADXL355_YDATA3, Y),
> +       ADXL355_ACCEL_CHANNEL(2, ADXL355_ZDATA3, Z),
> +       {
> +               .type = IIO_TEMP,
> +               .address = ADXL355_TEMP2,
> +               .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> +                                     BIT(IIO_CHAN_INFO_SCALE) |
> +                                     BIT(IIO_CHAN_INFO_OFFSET),
> +               .scan_index = 3,
> +               .scan_type = {
> +                       .sign = 's',
> +                       .realbits = 12,
> +                       .storagebits = 16,
> +                       .endianness = IIO_BE,
> +               },
> +       }
> +};
> +
> +int adxl355_core_probe(struct device *dev, struct regmap *regmap,
> +                      const char *name)
> +{
> +       struct adxl355_data *data;
> +       struct iio_dev *indio_dev;
> +       int ret;
> +
> +       indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
> +       if (!indio_dev)
> +               return -ENOMEM;
> +
> +       data = iio_priv(indio_dev);
> +       data->regmap = regmap;
> +       data->dev = dev;
> +       data->op_mode = ADXL355_STANDBY;
> +       mutex_init(&data->lock);
> +
> +       indio_dev->name = name;
> +       indio_dev->info = &adxl355_info;
> +       indio_dev->modes = INDIO_DIRECT_MODE;
> +       indio_dev->channels = adxl355_channels;
> +       indio_dev->num_channels = ARRAY_SIZE(adxl355_channels);
> +       indio_dev->available_scan_masks = adxl355_avail_scan_masks;
> +
> +       ret = adxl355_setup(data);
> +       if (ret < 0) {
> +               dev_err(dev, "ADXL355 setup failed\n");
> +               return ret;
> +       }
> +
> +       return devm_iio_device_register(dev, indio_dev);
> +}
> +EXPORT_SYMBOL_GPL(adxl355_core_probe);
> +
> +MODULE_AUTHOR("Puranjay Mohan <puranjay12@gmail.com>");
> +MODULE_DESCRIPTION("ADXL355 3-Axis Digital Accelerometer core driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/iio/accel/adxl355_i2c.c b/drivers/iio/accel/adxl355_i2c.c
> new file mode 100644
> index 000000000..1c9764129
> --- /dev/null
> +++ b/drivers/iio/accel/adxl355_i2c.c
> @@ -0,0 +1,63 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * ADXL355 3-Axis Digital Accelerometer I2C driver
> + *
> + * Copyright (c) 2021 Puranjay Mohan <puranjay12@gmail.com>
> + */
> +
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +
> +#include "adxl355.h"
> +
> +static const struct regmap_config adxl355_i2c_regmap_config = {
> +       .reg_bits = 8,
> +       .val_bits = 8,
> +       .max_register = 0x2F,
> +       .rd_table = &adxl355_readable_regs_tbl,
> +       .wr_table = &adxl355_writeable_regs_tbl
> +};
> +
> +static int adxl355_i2c_probe(struct i2c_client *client)
> +{
> +       struct regmap *regmap;
> +
> +       regmap = devm_regmap_init_i2c(client, &adxl355_i2c_regmap_config);
> +       if (IS_ERR(regmap)) {
> +               dev_err(&client->dev, "Error initializing i2c regmap: %ld\n",
> +                       PTR_ERR(regmap));
> +               return PTR_ERR(regmap);
> +       }
> +
> +       return adxl355_core_probe(&client->dev, regmap, client->name);
> +}
> +
> +static const struct i2c_device_id adxl355_i2c_id[] = {
> +       { "adxl355", 0 },
> +       { }
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, adxl355_i2c_id);
> +
> +static const struct of_device_id adxl355_of_match[] = {
> +       { .compatible = "adi,adxl355" },
> +       { },

comma can be removed from null terminator

> +};
> +
> +MODULE_DEVICE_TABLE(of, adxl355_of_match);
> +
> +static struct i2c_driver adxl355_i2c_driver = {
> +       .driver = {
> +               .name   = "adxl355_i2c",
> +               .of_match_table = adxl355_of_match,
> +       },
> +       .probe_new      = adxl355_i2c_probe,
> +       .id_table       = adxl355_i2c_id,
> +};
> +
> +module_i2c_driver(adxl355_i2c_driver);
> +
> +MODULE_AUTHOR("Puranjay Mohan <puranjay12@gmail.com>");
> +MODULE_DESCRIPTION("ADXL355 3-Axis Digital Accelerometer I2C driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/iio/accel/adxl355_spi.c b/drivers/iio/accel/adxl355_spi.c
> new file mode 100644
> index 000000000..ae02cbfad
> --- /dev/null
> +++ b/drivers/iio/accel/adxl355_spi.c
> @@ -0,0 +1,66 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * ADXL355 3-Axis Digital Accelerometer SPI driver
> + *
> + * Copyright (c) 2021 Puranjay Mohan <puranjay12@gmail.com>
> + */
> +
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +#include <linux/spi/spi.h>
> +
> +#include "adxl355.h"
> +
> +static const struct regmap_config adxl355_spi_regmap_config = {
> +       .reg_bits = 7,
> +       .pad_bits = 1,
> +       .val_bits = 8,
> +       .read_flag_mask = BIT(0),
> +       .max_register = 0x2F,
> +       .rd_table = &adxl355_readable_regs_tbl,
> +       .wr_table = &adxl355_writeable_regs_tbl
> +};
> +
> +static int adxl355_spi_probe(struct spi_device *spi)
> +{
> +       const struct spi_device_id *id = spi_get_device_id(spi);
> +       struct regmap *regmap;
> +
> +       regmap = devm_regmap_init_spi(spi, &adxl355_spi_regmap_config);
> +       if (IS_ERR(regmap)) {
> +               dev_err(&spi->dev, "Error initializing spi regmap: %ld\n",
> +                       PTR_ERR(regmap));
> +               return PTR_ERR(regmap);
> +       }
> +
> +       return adxl355_core_probe(&spi->dev, regmap, id->name);
> +}
> +
> +static const struct spi_device_id adxl355_spi_id[] = {
> +       { "adxl355", 0 },
> +       { }
> +};
> +
> +MODULE_DEVICE_TABLE(spi, adxl355_spi_id);
> +
> +static const struct of_device_id adxl355_of_match[] = {
> +       { .compatible = "adi,adxl355" },
> +       { },

comma can be removed from null terminator

> +};
> +
> +MODULE_DEVICE_TABLE(of, adxl355_of_match);
> +
> +static struct spi_driver adxl355_spi_driver = {
> +       .driver = {
> +               .name   = "adxl355_spi",
> +               .of_match_table = adxl355_of_match,
> +       },
> +       .probe          = adxl355_spi_probe,
> +       .id_table       = adxl355_spi_id,
> +};
> +
> +module_spi_driver(adxl355_spi_driver);
> +
> +MODULE_AUTHOR("Puranjay Mohan <puranjay12@gmail.com>");
> +MODULE_DESCRIPTION("ADXL355 3-Axis Digital Accelerometer SPI driver");
> +MODULE_LICENSE("GPL v2");
> --
> 2.30.1
>

Re: [PATCH v1 2/2] iio: accel: Add driver support for ADXL355

[Puranjay Mohan]

On Wed, Jul 21, 2021 at 4:16 PM Alexandru Ardelean
<ardeleanalex@gmail.com> wrote:
>
> On Wed, Jul 21, 2021 at 1:24 PM Puranjay Mohan <puranjay12@gmail.com> wrote:
> >
> > ADXL355 is 3-axis MEMS Accelerometer. It offers low noise density,
> > low 0g offset drift, low power with selectable measurement ranges.
> > It also features programmable high-pass and low-pass filters.
> >
>
> This looks like V2.
> A few notes inline.
>
> This looks a bit better than the previous version :)
>
> One general thing is that this driver can also support adxl354, with
> some adjustment.
> But that can be added later.
>
> > Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/adxl354_adxl355.pdf
> > Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
> > ---
> >  MAINTAINERS                      |   7 +
> >  drivers/iio/accel/Kconfig        |  29 ++
> >  drivers/iio/accel/Makefile       |   3 +
> >  drivers/iio/accel/adxl355.h      |  83 +++++
> >  drivers/iio/accel/adxl355_core.c | 541 +++++++++++++++++++++++++++++++
> >  drivers/iio/accel/adxl355_i2c.c  |  63 ++++
> >  drivers/iio/accel/adxl355_spi.c  |  66 ++++
> >  7 files changed, 792 insertions(+)
> >  create mode 100644 drivers/iio/accel/adxl355.h
> >  create mode 100644 drivers/iio/accel/adxl355_core.c
> >  create mode 100644 drivers/iio/accel/adxl355_i2c.c
> >  create mode 100644 drivers/iio/accel/adxl355_spi.c
> >
>
> Some people like to see a changelog here of what was changed.

Actually, I had added the changelog in the cover letter, will add it
here too next time.
>
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index bd7aff0c1..461f2a192 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -586,6 +586,13 @@ W: http://ez.analog.com/community/linux-device-drivers
> >  F:     Documentation/devicetree/bindings/iio/accel/adi,adxl345.yaml
> >  F:     drivers/input/misc/adxl34x.c
> >
> > +ADXL355 THREE-AXIS DIGITAL ACCELEROMETER DRIVER
> > +M:     Puranjay Mohan <puranjay12@gmail.com>
> > +L:     linux-iio@vger.kernel.org
> > +S:     Supported
> > +F:     drivers/iio/accel/adxl34x.c
> > +F:     Documentation/devicetree/bindings/iio/accel/adi,adxl355.yaml
> > +
> >  ADXL372 THREE-AXIS DIGITAL ACCELEROMETER DRIVER
> >  M:     Michael Hennerich <michael.hennerich@analog.com>
> >  S:     Supported
> > diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
> > index cceda3cec..9a65353a4 100644
> > --- a/drivers/iio/accel/Kconfig
> > +++ b/drivers/iio/accel/Kconfig
> > @@ -61,6 +61,35 @@ config ADXL345_SPI
> >           will be called adxl345_spi and you will also get adxl345_core
> >           for the core module.
> >
> > +config ADXL355
> > +       tristate
> > +
> > +config ADXL355_I2C
> > +       tristate "Analog Devices ADXL355 3-Axis Digital Accelerometer I2C Driver"
> > +       depends on I2C
> > +       select ADXL355
> > +       select REGMAP_I2C
> > +       help
> > +         Say Y here if you want to build support for the Analog Devices
> > +         ADXL355 3-axis digital accelerometer.
> > +
> > +         To compile this driver as a module, choose M here: the module
> > +         will be called adxl355_i2c and you will also get adxl355_core
> > +         for the core module.
> > +
> > +config ADXL355_SPI
> > +       tristate "Analog Devices ADXL355 3-Axis Digital Accelerometer SPI Driver"
> > +       depends on SPI
> > +       select ADXL355
> > +       select REGMAP_SPI
> > +       help
> > +         Say Y here if you want to build support for the Analog Devices
> > +         ADXL355 3-axis digital accelerometer.
> > +
> > +         To compile this driver as a module, choose M here: the module
> > +         will be called adxl355_spi and you will also get adxl355_core
> > +         for the core module.
> > +
> >  config ADXL372
> >         tristate
> >         select IIO_BUFFER
> > diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
> > index 32cd1342a..0e4721d2d 100644
> > --- a/drivers/iio/accel/Makefile
> > +++ b/drivers/iio/accel/Makefile
> > @@ -9,6 +9,9 @@ obj-$(CONFIG_ADIS16209) += adis16209.o
> >  obj-$(CONFIG_ADXL345) += adxl345_core.o
> >  obj-$(CONFIG_ADXL345_I2C) += adxl345_i2c.o
> >  obj-$(CONFIG_ADXL345_SPI) += adxl345_spi.o
> > +obj-$(CONFIG_ADXL355) += adxl355_core.o
> > +obj-$(CONFIG_ADXL355_I2C) += adxl355_i2c.o
> > +obj-$(CONFIG_ADXL355_SPI) += adxl355_spi.o
> >  obj-$(CONFIG_ADXL372) += adxl372.o
> >  obj-$(CONFIG_ADXL372_I2C) += adxl372_i2c.o
> >  obj-$(CONFIG_ADXL372_SPI) += adxl372_spi.o
> > diff --git a/drivers/iio/accel/adxl355.h b/drivers/iio/accel/adxl355.h
> > new file mode 100644
> > index 000000000..e52c294d8
> > --- /dev/null
> > +++ b/drivers/iio/accel/adxl355.h
> > @@ -0,0 +1,83 @@
> > +/* SPDX-License-Identifier: GPL-2.0-only */
> > +/*
> > + * ADXL355 3-Axis Digital Accelerometer
> > + *
> > + * Copyright (c) 2021 Puranjay Mohan <puranjay12@gmail.com>
> > + */
> > +
> > +#ifndef _ADXL355_H_
> > +#define _ADXL355_H_
> > +
> > +#include <linux/regmap.h>
> > +
> > +/* ADXL355 Register Definitions */
> > +#define ADXL355_DEVID_AD       0x00
> > +#define ADXL355_DEVID_MST      0x01
> > +#define ADXL355_PARTID         0x02
> > +#define ADXL355_REVID          0x03
> > +#define ADXL355_STATUS         0x04
> > +#define ADXL355_FIFO_ENTRIES   0x05
> > +#define ADXL355_TEMP2          0x06
> > +#define ADXL355_XDATA3         0x08
> > +#define ADXL355_YDATA3         0x0B
> > +#define ADXL355_ZDATA3         0x0E
> > +#define ADXL355_FIFO_DATA      0x11
> > +#define ADXL355_OFFSET_X_H     0x1E
> > +#define ADXL355_OFFSET_Y_H     0x20
> > +#define ADXL355_OFFSET_Z_H     0x22
> > +#define ADXL355_ACT_EN         0x24
> > +#define ADXL355_ACT_THRESH_H   0x25
> > +#define ADXL355_ACT_THRESH_L   0x26
> > +#define ADXL355_ACT_COUNT      0x27
> > +#define ADXL355_FILTER         0x28
> > +#define ADXL355_FIFO_SAMPLES   0x29
> > +#define ADXL355_INT_MAP                0x2A
> > +#define ADXL355_SYNC           0x2B
> > +#define ADXL355_RANGE          0x2C
> > +#define ADXL355_POWER_CTL      0x2D
> > +#define ADXL355_SELF_TEST      0x2E
> > +#define ADXL355_RESET          0x2F
> > +
> > +#define ADXL355_DEVID_AD_VAL   0xAD
> > +#define ADXL355_DEVID_MST_VAL  0x1D
> > +#define ADXL355_PARTID_VAL     0xED
> > +#define ADXL355_REVID_VAL      0x01
> > +#define ADXL355_RESET_CODE     0x52
> > +
> > +#define ADXL355_POWER_CTL_MODE_MSK     GENMASK(1, 0)
> > +
> > +#define ADXL355_FILTER_ODR_MSK                 GENMASK(3, 0)
> > +#define ADXL355_FILTER_ODR_MODE(x)             ((x) & 0xF)
> > +#define ADXL355_FILTER_HPF_MSK                 GENMASK(6, 4)
> > +#define ADXL355_FILTER_HPF_MODE(x)             (((x) & 0x7) << 4)
> > +
> > +/*
> > + * The datasheet defines an intercept of 1885 LSB at 25 degC
> > + * and a slope of -9.05 LSB/C. The following formula can be used to find the
> > + * temperature:
> > + * Temp = ((RAW - 1885)/(-9.05)) + 25 but this doesn't follow the format of
> > + * the IIO which is Temp = (RAW + OFFSET) * SCALE. Hence using some rearranging
> > + * we get the scale as -110.49723 and offset as -2111.25
> > + */
> > +#define TEMP_SCALE_VAL -110
> > +#define TEMP_SCALE_VAL2 497238
> > +#define TEMP_OFFSET_VAL -2111
> > +#define TEMP_OFFSET_VAL2 250000
> > +
> > +/*
> > + * At +/- 2g with 20-bit resolution, scale is given in datasheet as
> > + * 3.9ug/LSB = 0.0000039 * 9.80665 = 0.00003824593 m/s^2
> > + */
> > +#define ADXL355_NSCALE 38245
> > +
> > +extern const struct regmap_range adxl355_read_reg_range[];
>
> This likely fails because adxl355_read_reg_range is re-defined as static.
>
I forgot to remove these, realized it just after sending the patch.

> > +
> > +extern const struct regmap_access_table adxl355_readable_regs_tbl;
> > +
> > +extern const struct regmap_range adxl355_write_reg_range[];
> > +
> > +extern const struct regmap_access_table adxl355_writeable_regs_tbl;
> > +
> > +int adxl355_core_probe(struct device *dev, struct regmap *regmap,
> > +                      const char *name);
> > +#endif /* _ADXL355_H_ */
> > diff --git a/drivers/iio/accel/adxl355_core.c b/drivers/iio/accel/adxl355_core.c
> > new file mode 100644
> > index 000000000..ff90e5aa6
> > --- /dev/null
> > +++ b/drivers/iio/accel/adxl355_core.c
> > @@ -0,0 +1,541 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * ADXL355 3-Axis Digital Accelerometer IIO core driver
> > + *
> > + * Copyright (c) 2021 Puranjay Mohan <puranjay12@gmail.com>
> > + *
> > + * Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/adxl354_adxl355.pdf
> > + */
> > +
> > +#include <linux/iio/iio.h>
> > +#include <linux/iio/sysfs.h>
> > +#include <linux/limits.h>
> > +#include <linux/math64.h>
> > +#include <linux/module.h>
> > +#include <linux/regmap.h>
> > +
> > +#include "adxl355.h"
> > +
> > +static const struct regmap_range adxl355_read_reg_range[] = {
> > +       regmap_reg_range(ADXL355_DEVID_AD, ADXL355_FIFO_DATA),
> > +       regmap_reg_range(ADXL355_OFFSET_X_H, ADXL355_SELF_TEST)
> > +};
> > +
> > +const struct regmap_access_table adxl355_readable_regs_tbl = {
> > +       .yes_ranges = adxl355_read_reg_range,
> > +       .n_yes_ranges = ARRAY_SIZE(adxl355_read_reg_range),
> > +};
> > +EXPORT_SYMBOL_GPL(adxl355_readable_regs_tbl);
> > +
> > +static const struct regmap_range adxl355_write_reg_range[] = {
> > +       regmap_reg_range(ADXL355_OFFSET_X_H, ADXL355_RESET)
> > +};
> > +
> > +const struct regmap_access_table adxl355_writeable_regs_tbl = {
> > +       .yes_ranges = adxl355_write_reg_range,
> > +       .n_yes_ranges = ARRAY_SIZE(adxl355_write_reg_range),
> > +};
> > +EXPORT_SYMBOL_GPL(adxl355_writeable_regs_tbl);
> > +
> > +enum adxl355_op_mode {
> > +       ADXL355_MEASUREMENT,
> > +       ADXL355_STANDBY,
> > +       ADXL355_TEMP_OFF
> > +};
> > +
> > +enum adxl355_odr {
> > +       ADXL355_ODR_4000HZ,
> > +       ADXL355_ODR_2000HZ,
> > +       ADXL355_ODR_1000HZ,
> > +       ADXL355_ODR_500HZ,
> > +       ADXL355_ODR_250HZ,
> > +       ADXL355_ODR_125HZ,
> > +       ADXL355_ODR_62_5HZ,
> > +       ADXL355_ODR_31_25HZ,
> > +       ADXL355_ODR_15_625HZ,
> > +       ADXL355_ODR_7_813HZ,
> > +       ADXL355_ODR_3_906HZ
> > +};
> > +
> > +enum adxl355_hpf_3db {
> > +       ADXL355_HPF_OFF,
> > +       ADXL355_HPF_24_7,
> > +       ADXL355_HPF_6_2084,
> > +       ADXL355_HPF_1_5545,
> > +       ADXL355_HPF_0_3862,
> > +       ADXL355_HPF_0_0954,
> > +       ADXL355_HPF_0_0238
> > +};
> > +
> > +static const int adxl355_odr_table[][2] = {
> > +       [0] = {4000, 0},
> > +       [1] = {2000, 0},
> > +       [2] = {1000, 0},
> > +       [3] = {500, 0},
> > +       [4] = {250, 0},
> > +       [5] = {125, 0},
> > +       [6] = {62, 500000},
> > +       [7] = {31, 250000},
> > +       [8] = {15, 625000},
> > +       [9] = {7, 813000},
> > +       [10] = {3, 906000}
> > +};
> > +
> > +static const int adxl355_hpf_3db_multipliers[] = {
> > +       0,
> > +       247000,
> > +       62084,
> > +       15545,
> > +       3862,
> > +       954,
> > +       238
> > +};
> > +
> > +struct adxl355_data {
> > +       struct regmap *regmap;
> > +       struct device *dev;
> > +       struct mutex lock; /* lock to protect op_mode */
> > +       enum adxl355_op_mode op_mode;
> > +       enum adxl355_odr odr;
> > +       enum adxl355_hpf_3db hpf_3db;
> > +       int x_calibbias;
> > +       int y_calibbias;
> > +       int z_calibbias;
> > +       int adxl355_hpf_3db_table[7][2];
> > +};
> > +
> > +static int adxl355_set_op_mode(struct adxl355_data *data,
> > +                              enum adxl355_op_mode op_mode)
> > +{
> > +       int ret;
> > +
> > +       if (data->op_mode == op_mode)
> > +               return 0;
> > +
> > +       ret = regmap_update_bits(data->regmap, ADXL355_POWER_CTL,
> > +                                ADXL355_POWER_CTL_MODE_MSK, op_mode);
> > +       if (ret < 0)
> > +               return ret;
> > +
> > +       data->op_mode = op_mode;
> > +
> > +       return ret;
> > +}
> > +
> > +static void adxl355_fill_3db_frequency_table(struct adxl355_data *data)
> > +{
> > +       int i;
> > +       u64 rem;
> > +       u64 div;
> > +       u32 multiplier;
> > +       u64 odr = mul_u64_u32_shr(adxl355_odr_table[data->odr][0], 1000000, 0) +
> > +                                       adxl355_odr_table[data->odr][1];
> > +
> > +       for (i = 0; i < ARRAY_SIZE(adxl355_hpf_3db_multipliers); i++) {
> > +               multiplier = adxl355_hpf_3db_multipliers[i];
> > +               div = div64_u64_rem(mul_u64_u32_shr(odr, multiplier, 0),
> > +                                   100000000000000UL, &rem);
> > +
> > +               data->adxl355_hpf_3db_table[i][0] = div;
> > +               data->adxl355_hpf_3db_table[i][1] = div_u64(rem, 100000000);
> > +       }
> > +}
> > +
> > +static int adxl355_setup(struct adxl355_data *data)
> > +{
> > +       unsigned int regval;
> > +       int ret;
> > +
> > +       ret = regmap_read(data->regmap, ADXL355_DEVID_AD, &regval);
> > +       if (ret < 0)
> > +               return ret;
> > +
> > +       if (regval != ADXL355_DEVID_AD_VAL) {
> > +               dev_err(data->dev, "Invalid ADI ID 0x%02x\n", regval);
> > +               return -ENODEV;
> > +       }
> > +
> > +       ret = regmap_read(data->regmap, ADXL355_DEVID_MST, &regval);
> > +       if (ret < 0)
> > +               return ret;
> > +
> > +       if (regval != ADXL355_DEVID_MST_VAL) {
> > +               dev_err(data->dev, "Invalid MEMS ID 0x%02x\n", regval);
> > +               return -ENODEV;
> > +       }
> > +
> > +       ret = regmap_read(data->regmap, ADXL355_PARTID, &regval);
> > +       if (ret < 0)
> > +               return ret;
> > +
> > +       if (regval != ADXL355_PARTID_VAL) {
> > +               dev_err(data->dev, "Invalid DEV ID 0x%02x\n", regval);
> > +               return -ENODEV;
> > +       }
> > +
> > +       /*
> > +        * Perform a software reset to make sure the device is in a consistent
> > +        * state after start up.
> > +        */
> > +       ret = regmap_write(data->regmap, ADXL355_RESET, ADXL355_RESET_CODE);
> > +       if (ret < 0)
> > +               return ret;
> > +
> > +       adxl355_fill_3db_frequency_table(data);
> > +
> > +       return adxl355_set_op_mode(data, ADXL355_MEASUREMENT);
> > +}
> > +
> > +static int adxl355_get_temp_data(struct adxl355_data *data,
> > +                                u8 addr, __be16 *out)
> > +{
> > +       return regmap_bulk_read(data->regmap, addr, out, sizeof(*out));
> > +}
> > +
> > +static int adxl355_read_axis(struct adxl355_data *data, u8 addr)
> > +{
> > +       __be32 regval;
> > +       int ret;
> > +
> > +       ret = regmap_bulk_read(data->regmap, addr, &regval, 3);
> > +       if (ret < 0)
> > +               return ret;
> > +
> > +       return be32_to_cpu(regval) >> 8;
> > +}
> > +
> > +static int adxl355_find_match(const int (*freq_tbl)[2], const int n,
> > +                             const int val, const int val2)
> > +{
> > +       int i;
> > +
> > +       for (i = 0; i < n; i++) {
> > +               if (freq_tbl[i][0] == val && freq_tbl[i][1] == val2)
> > +                       return i;
> > +       }
> > +
> > +       return -EINVAL;
> > +}
> > +
> > +static int adxl355_set_odr(struct adxl355_data *data,
> > +                          enum adxl355_odr odr)
> > +{
> > +       int ret = 0;
> > +
> > +       mutex_lock(&data->lock);
> > +
> > +       if (data->odr == odr)
> > +               goto out_unlock;
> > +
> > +       ret = adxl355_set_op_mode(data, ADXL355_STANDBY);
> > +       if (ret < 0)
> > +               goto out_unlock;
> > +
> > +       ret = regmap_update_bits(data->regmap, ADXL355_FILTER,
> > +                                ADXL355_FILTER_ODR_MSK,
> > +                                ADXL355_FILTER_ODR_MODE(odr));
> > +       if (!ret) {
> > +               data->odr = odr;
> > +               adxl355_fill_3db_frequency_table(data);
> > +       }
> > +
> > +out_unlock:
> > +       ret = adxl355_set_op_mode(data, ADXL355_MEASUREMENT);
> > +       mutex_unlock(&data->lock);
> > +       return ret;
> > +}
> > +
> > +static int adxl355_set_hpf_3db(struct adxl355_data *data,
> > +                              enum adxl355_hpf_3db hpf)
> > +{
> > +       int ret = 0;
> > +
> > +       mutex_lock(&data->lock);
> > +
> > +       if (data->hpf_3db == hpf)
> > +               goto out_unlock;
> > +
> > +       ret = adxl355_set_op_mode(data, ADXL355_STANDBY);
> > +       if (ret < 0)
> > +               goto out_unlock;
> > +
> > +       ret = regmap_update_bits(data->regmap, ADXL355_FILTER,
> > +                                ADXL355_FILTER_HPF_MSK,
> > +                                ADXL355_FILTER_HPF_MODE(hpf));
> > +       if (!ret)
> > +               data->hpf_3db = hpf;
> > +
> > +out_unlock:
> > +       ret = adxl355_set_op_mode(data, ADXL355_MEASUREMENT);
> > +       mutex_unlock(&data->lock);
> > +       return ret;
> > +}
> > +
> > +static int adxl355_set_calibbias(struct adxl355_data *data,
> > +                                int scan_index, int calibbias)
> > +{
> > +       int ret = 0;
> > +       __be16 reg = cpu_to_be16(calibbias);
> > +
> > +       mutex_lock(&data->lock);
> > +
> > +       ret = adxl355_set_op_mode(data, ADXL355_STANDBY);
> > +       if (ret < 0)
> > +               goto out_unlock;
> > +
> > +       switch (scan_index) {
> > +       case 0:
> > +               ret = regmap_bulk_write(data->regmap, ADXL355_OFFSET_X_H,
> > +                                       &reg, 2);
> > +               if (ret < 0)
> > +                       goto out_unlock;
> > +               data->x_calibbias = calibbias;
> > +               break;
> > +       case 1:
> > +               ret = regmap_bulk_write(data->regmap, ADXL355_OFFSET_Y_H,
> > +                                       &reg, 2);
> > +               if (ret < 0)
> > +                       goto out_unlock;
> > +               data->y_calibbias = calibbias;
> > +               break;
> > +       case 2:
> > +               ret = regmap_bulk_write(data->regmap, ADXL355_OFFSET_Z_H,
> > +                                       &reg, 2);
> > +               if (ret < 0)
> > +                       goto out_unlock;
> > +               data->z_calibbias = calibbias;
> > +               break;
> > +       default:
> > +               ret = -EINVAL;
> > +               break;
> > +       }
> > +
> > +out_unlock:
> > +       ret = adxl355_set_op_mode(data, ADXL355_MEASUREMENT);
> > +       mutex_unlock(&data->lock);
> > +       return ret;
> > +}
> > +
> > +static int adxl355_read_raw(struct iio_dev *indio_dev,
> > +                           struct iio_chan_spec const *chan,
> > +                           int *val, int *val2, long mask)
> > +{
> > +       struct adxl355_data *data = iio_priv(indio_dev);
> > +       int ret;
> > +       __be16 out;
> > +
> > +       switch (mask) {
> > +       case IIO_CHAN_INFO_RAW:
> > +               switch (chan->type) {
> > +               case IIO_TEMP:
> > +                       ret = adxl355_get_temp_data(data, chan->address, &out);
> > +                       if (ret < 0)
> > +                               break;
> > +                       *val = be16_to_cpu(out);
> > +                       ret = IIO_VAL_INT;
> > +                       break;
> > +
> > +               case IIO_ACCEL:
> > +                       ret = adxl355_read_axis(data, chan->address);
> > +                       if (ret < 0)
> > +                               break;
> > +                       *val = sign_extend32(ret >> (chan->scan_type.shift),
> > +                                            chan->scan_type.realbits - 1);
> > +                       ret = IIO_VAL_INT;
> > +                       break;
> > +
> > +               default:
> > +                       ret = -EINVAL;
> > +                       break;
>
> Since this will get an update anyway.
> This switch statement could be replaced with direct  return -EINVAL and similar.
> Other switch statements seem to do it.
> It would make this consistent with the other below.

will change it in the next version.
>
> > +               }
> > +
> > +               return ret;
> > +       case IIO_CHAN_INFO_SCALE:
> > +               switch (chan->type) {
> > +               case IIO_TEMP:
> > +                       *val = TEMP_SCALE_VAL;
> > +                       *val2 = TEMP_SCALE_VAL2;
> > +                       return IIO_VAL_INT_PLUS_MICRO;
> > +               case IIO_ACCEL:
> > +                       *val = 0;
> > +                       *val2 = ADXL355_NSCALE;
> > +                       return IIO_VAL_INT_PLUS_NANO;
> > +               default:
> > +                       return -EINVAL;
> > +               }
> > +       case IIO_CHAN_INFO_OFFSET:
> > +               *val = TEMP_OFFSET_VAL;
> > +               *val2 = TEMP_OFFSET_VAL2;
> > +               return IIO_VAL_INT_PLUS_MICRO;
> > +       case IIO_CHAN_INFO_CALIBBIAS:
> > +               if (chan->scan_index == 0)
> > +                       *val = data->x_calibbias;
> > +               else if (chan->scan_index == 1)
> > +                       *val = data->y_calibbias;
> > +               else
> > +                       *val = data->z_calibbias;
> > +               *val = sign_extend32(*val, 15);
> > +               return IIO_VAL_INT;
> > +       case IIO_CHAN_INFO_SAMP_FREQ:
> > +               *val = adxl355_odr_table[data->odr][0];
> > +               *val2 = adxl355_odr_table[data->odr][1];
> > +               return IIO_VAL_INT_PLUS_MICRO;
> > +       case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
> > +               *val = data->adxl355_hpf_3db_table[data->hpf_3db][0];
> > +               *val2 = data->adxl355_hpf_3db_table[data->hpf_3db][1];
> > +               return IIO_VAL_INT_PLUS_MICRO;
> > +       }
> > +       return -EINVAL;
> > +}
> > +
> > +static int adxl355_write_raw(struct iio_dev *indio_dev,
> > +                            struct iio_chan_spec const *chan,
> > +                            int val, int val2, long mask)
> > +{
> > +       struct adxl355_data *data = iio_priv(indio_dev);
> > +       int odr_idx, hpf_idx, calibbias;
> > +
> > +       switch (mask) {
> > +       case IIO_CHAN_INFO_SAMP_FREQ:
> > +               odr_idx = adxl355_find_match(adxl355_odr_table,
> > +                                            ARRAY_SIZE(adxl355_odr_table),
> > +                                            val, val2);
> > +               if (odr_idx < 0)
> > +                       return odr_idx;
> > +
> > +               return adxl355_set_odr(data, odr_idx);
> > +       case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
> > +               hpf_idx = adxl355_find_match(data->adxl355_hpf_3db_table,
> > +                                       ARRAY_SIZE(data->adxl355_hpf_3db_table),
> > +                                            val, val2);
> > +               if (hpf_idx < 0)
> > +                       return hpf_idx;
> > +
> > +               return adxl355_set_hpf_3db(data, hpf_idx);
> > +       case IIO_CHAN_INFO_CALIBBIAS:
> > +               calibbias = clamp_t(int, val, S16_MIN, S16_MAX);
> > +
> > +               return adxl355_set_calibbias(data, chan->scan_index, calibbias);
> > +       default:
> > +               return -EINVAL;
> > +       }
> > +}
> > +
> > +static int adxl355_read_avail(struct iio_dev *indio_dev,
> > +                             struct iio_chan_spec const *chan,
> > +                             const int **vals, int *type, int *length,
> > +                             long mask)
> > +{
> > +       struct adxl355_data *data = iio_priv(indio_dev);
> > +
> > +       switch (mask) {
> > +       case IIO_CHAN_INFO_SAMP_FREQ:
> > +               *vals = (const int *)adxl355_odr_table;
> > +               *type = IIO_VAL_INT_PLUS_MICRO;
> > +               /* Values are stored in a 2D matrix */
> > +               *length = ARRAY_SIZE(adxl355_odr_table) * 2;
> > +
> > +               return IIO_AVAIL_LIST;
> > +       case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
> > +               *vals = (const int *)(data->adxl355_hpf_3db_table);
> > +               *type = IIO_VAL_INT_PLUS_MICRO;
> > +               /* Values are stored in a 2D matrix */
> > +               *length = ARRAY_SIZE(data->adxl355_hpf_3db_table) * 2;
> > +
> > +               return IIO_AVAIL_LIST;
> > +       default:
> > +               return -EINVAL;
> > +       }
> > +}
> > +
> > +static const unsigned long adxl355_avail_scan_masks[] = {
> > +       GENMASK(3, 0),
> > +       0
> > +};
> > +
> > +static const struct iio_info adxl355_info = {
> > +       .read_raw       = adxl355_read_raw,
> > +       .write_raw      = adxl355_write_raw,
> > +       .read_avail     = &adxl355_read_avail
> > +};
> > +
> > +#define ADXL355_ACCEL_CHANNEL(index, reg, axis) {                      \
> > +       .type = IIO_ACCEL,                                              \
> > +       .address = reg,                                                 \
> > +       .modified = 1,                                                  \
> > +       .channel2 = IIO_MOD_##axis,                                     \
> > +       .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |                  \
> > +                             BIT(IIO_CHAN_INFO_CALIBBIAS),             \
> > +       .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |          \
> > +                                   BIT(IIO_CHAN_INFO_SAMP_FREQ) |      \
> > +               BIT(IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY),      \
> > +       .info_mask_shared_by_type_available =                           \
> > +               BIT(IIO_CHAN_INFO_SAMP_FREQ) |                          \
> > +               BIT(IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY),      \
> > +       .scan_index = index,                                            \
> > +       .scan_type = {                                                  \
> > +               .sign = 's',                                            \
> > +               .realbits = 20,                                         \
> > +               .storagebits = 32,                                      \
> > +               .shift = 4,                                             \
> > +               .endianness = IIO_BE,                                   \
> > +       }                                                               \
> > +}
> > +
> > +static const struct iio_chan_spec adxl355_channels[] = {
> > +       ADXL355_ACCEL_CHANNEL(0, ADXL355_XDATA3, X),
> > +       ADXL355_ACCEL_CHANNEL(1, ADXL355_YDATA3, Y),
> > +       ADXL355_ACCEL_CHANNEL(2, ADXL355_ZDATA3, Z),
> > +       {
> > +               .type = IIO_TEMP,
> > +               .address = ADXL355_TEMP2,
> > +               .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> > +                                     BIT(IIO_CHAN_INFO_SCALE) |
> > +                                     BIT(IIO_CHAN_INFO_OFFSET),
> > +               .scan_index = 3,
> > +               .scan_type = {
> > +                       .sign = 's',
> > +                       .realbits = 12,
> > +                       .storagebits = 16,
> > +                       .endianness = IIO_BE,
> > +               },
> > +       }
> > +};
> > +
> > +int adxl355_core_probe(struct device *dev, struct regmap *regmap,
> > +                      const char *name)
> > +{
> > +       struct adxl355_data *data;
> > +       struct iio_dev *indio_dev;
> > +       int ret;
> > +
> > +       indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
> > +       if (!indio_dev)
> > +               return -ENOMEM;
> > +
> > +       data = iio_priv(indio_dev);
> > +       data->regmap = regmap;
> > +       data->dev = dev;
> > +       data->op_mode = ADXL355_STANDBY;
> > +       mutex_init(&data->lock);
> > +
> > +       indio_dev->name = name;
> > +       indio_dev->info = &adxl355_info;
> > +       indio_dev->modes = INDIO_DIRECT_MODE;
> > +       indio_dev->channels = adxl355_channels;
> > +       indio_dev->num_channels = ARRAY_SIZE(adxl355_channels);
> > +       indio_dev->available_scan_masks = adxl355_avail_scan_masks;
> > +
> > +       ret = adxl355_setup(data);
> > +       if (ret < 0) {
> > +               dev_err(dev, "ADXL355 setup failed\n");
> > +               return ret;
> > +       }
> > +
> > +       return devm_iio_device_register(dev, indio_dev);
> > +}
> > +EXPORT_SYMBOL_GPL(adxl355_core_probe);
> > +
> > +MODULE_AUTHOR("Puranjay Mohan <puranjay12@gmail.com>");
> > +MODULE_DESCRIPTION("ADXL355 3-Axis Digital Accelerometer core driver");
> > +MODULE_LICENSE("GPL v2");
> > diff --git a/drivers/iio/accel/adxl355_i2c.c b/drivers/iio/accel/adxl355_i2c.c
> > new file mode 100644
> > index 000000000..1c9764129
> > --- /dev/null
> > +++ b/drivers/iio/accel/adxl355_i2c.c
> > @@ -0,0 +1,63 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * ADXL355 3-Axis Digital Accelerometer I2C driver
> > + *
> > + * Copyright (c) 2021 Puranjay Mohan <puranjay12@gmail.com>
> > + */
> > +
> > +#include <linux/i2c.h>
> > +#include <linux/module.h>
> > +#include <linux/regmap.h>
> > +
> > +#include "adxl355.h"
> > +
> > +static const struct regmap_config adxl355_i2c_regmap_config = {
> > +       .reg_bits = 8,
> > +       .val_bits = 8,
> > +       .max_register = 0x2F,
> > +       .rd_table = &adxl355_readable_regs_tbl,
> > +       .wr_table = &adxl355_writeable_regs_tbl
> > +};
> > +
> > +static int adxl355_i2c_probe(struct i2c_client *client)
> > +{
> > +       struct regmap *regmap;
> > +
> > +       regmap = devm_regmap_init_i2c(client, &adxl355_i2c_regmap_config);
> > +       if (IS_ERR(regmap)) {
> > +               dev_err(&client->dev, "Error initializing i2c regmap: %ld\n",
> > +                       PTR_ERR(regmap));
> > +               return PTR_ERR(regmap);
> > +       }
> > +
> > +       return adxl355_core_probe(&client->dev, regmap, client->name);
> > +}
> > +
> > +static const struct i2c_device_id adxl355_i2c_id[] = {
> > +       { "adxl355", 0 },
> > +       { }
> > +};
> > +
> > +MODULE_DEVICE_TABLE(i2c, adxl355_i2c_id);
> > +
> > +static const struct of_device_id adxl355_of_match[] = {
> > +       { .compatible = "adi,adxl355" },
> > +       { },
>
> comma can be removed from null terminator
>
> > +};
> > +
> > +MODULE_DEVICE_TABLE(of, adxl355_of_match);
> > +
> > +static struct i2c_driver adxl355_i2c_driver = {
> > +       .driver = {
> > +               .name   = "adxl355_i2c",
> > +               .of_match_table = adxl355_of_match,
> > +       },
> > +       .probe_new      = adxl355_i2c_probe,
> > +       .id_table       = adxl355_i2c_id,
> > +};
> > +
> > +module_i2c_driver(adxl355_i2c_driver);
> > +
> > +MODULE_AUTHOR("Puranjay Mohan <puranjay12@gmail.com>");
> > +MODULE_DESCRIPTION("ADXL355 3-Axis Digital Accelerometer I2C driver");
> > +MODULE_LICENSE("GPL v2");
> > diff --git a/drivers/iio/accel/adxl355_spi.c b/drivers/iio/accel/adxl355_spi.c
> > new file mode 100644
> > index 000000000..ae02cbfad
> > --- /dev/null
> > +++ b/drivers/iio/accel/adxl355_spi.c
> > @@ -0,0 +1,66 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * ADXL355 3-Axis Digital Accelerometer SPI driver
> > + *
> > + * Copyright (c) 2021 Puranjay Mohan <puranjay12@gmail.com>
> > + */
> > +
> > +#include <linux/module.h>
> > +#include <linux/regmap.h>
> > +#include <linux/spi/spi.h>
> > +
> > +#include "adxl355.h"
> > +
> > +static const struct regmap_config adxl355_spi_regmap_config = {
> > +       .reg_bits = 7,
> > +       .pad_bits = 1,
> > +       .val_bits = 8,
> > +       .read_flag_mask = BIT(0),
> > +       .max_register = 0x2F,
> > +       .rd_table = &adxl355_readable_regs_tbl,
> > +       .wr_table = &adxl355_writeable_regs_tbl
> > +};
> > +
> > +static int adxl355_spi_probe(struct spi_device *spi)
> > +{
> > +       const struct spi_device_id *id = spi_get_device_id(spi);
> > +       struct regmap *regmap;
> > +
> > +       regmap = devm_regmap_init_spi(spi, &adxl355_spi_regmap_config);
> > +       if (IS_ERR(regmap)) {
> > +               dev_err(&spi->dev, "Error initializing spi regmap: %ld\n",
> > +                       PTR_ERR(regmap));
> > +               return PTR_ERR(regmap);
> > +       }
> > +
> > +       return adxl355_core_probe(&spi->dev, regmap, id->name);
> > +}
> > +
> > +static const struct spi_device_id adxl355_spi_id[] = {
> > +       { "adxl355", 0 },
> > +       { }
> > +};
> > +
> > +MODULE_DEVICE_TABLE(spi, adxl355_spi_id);
> > +
> > +static const struct of_device_id adxl355_of_match[] = {
> > +       { .compatible = "adi,adxl355" },
> > +       { },
>
> comma can be removed from null terminator
>
> > +};
> > +
> > +MODULE_DEVICE_TABLE(of, adxl355_of_match);
> > +
> > +static struct spi_driver adxl355_spi_driver = {
> > +       .driver = {
> > +               .name   = "adxl355_spi",
> > +               .of_match_table = adxl355_of_match,
> > +       },
> > +       .probe          = adxl355_spi_probe,
> > +       .id_table       = adxl355_spi_id,
> > +};
> > +
> > +module_spi_driver(adxl355_spi_driver);
> > +
> > +MODULE_AUTHOR("Puranjay Mohan <puranjay12@gmail.com>");
> > +MODULE_DESCRIPTION("ADXL355 3-Axis Digital Accelerometer SPI driver");
> > +MODULE_LICENSE("GPL v2");
> > --
> > 2.30.1
> >



-- 
Thanks and Regards

Yours Truly,

Puranjay Mohan

Re: [PATCH v1 2/2] iio: accel: Add driver support for ADXL355

[Alexandru Ardelean]

On Wed, Jul 21, 2021 at 2:40 PM Puranjay Mohan <puranjay12@gmail.com> wrote:
>
> On Wed, Jul 21, 2021 at 4:16 PM Alexandru Ardelean
> <ardeleanalex@gmail.com> wrote:
> >
> > On Wed, Jul 21, 2021 at 1:24 PM Puranjay Mohan <puranjay12@gmail.com> wrote:
> > >
> > > ADXL355 is 3-axis MEMS Accelerometer. It offers low noise density,
> > > low 0g offset drift, low power with selectable measurement ranges.
> > > It also features programmable high-pass and low-pass filters.
> > >
> >
> > This looks like V2.

oh, you started from V0
then this being V1 [from V0] this is fine;

> > A few notes inline.
> >
> > This looks a bit better than the previous version :)
> >
> > One general thing is that this driver can also support adxl354, with
> > some adjustment.
> > But that can be added later.
> >
> > > Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/adxl354_adxl355.pdf
> > > Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
> > > ---
> > >  MAINTAINERS                      |   7 +
> > >  drivers/iio/accel/Kconfig        |  29 ++
> > >  drivers/iio/accel/Makefile       |   3 +
> > >  drivers/iio/accel/adxl355.h      |  83 +++++
> > >  drivers/iio/accel/adxl355_core.c | 541 +++++++++++++++++++++++++++++++
> > >  drivers/iio/accel/adxl355_i2c.c  |  63 ++++
> > >  drivers/iio/accel/adxl355_spi.c  |  66 ++++
> > >  7 files changed, 792 insertions(+)
> > >  create mode 100644 drivers/iio/accel/adxl355.h
> > >  create mode 100644 drivers/iio/accel/adxl355_core.c
> > >  create mode 100644 drivers/iio/accel/adxl355_i2c.c
> > >  create mode 100644 drivers/iio/accel/adxl355_spi.c
> > >
> >
> > Some people like to see a changelog here of what was changed.
>
> Actually, I had added the changelog in the cover letter, will add it
> here too next time.

I forgot to look at the cover letter.
Apologies for the noise here.

I usually take a look at the driver code, as that part I can review.
I don't look at DT stuff [much] as that seems to be handled by Rob usually.

> >
> > > diff --git a/MAINTAINERS b/MAINTAINERS
> > > index bd7aff0c1..461f2a192 100644
> > > --- a/MAINTAINERS
> > > +++ b/MAINTAINERS
> > > @@ -586,6 +586,13 @@ W: http://ez.analog.com/community/linux-device-drivers
> > >  F:     Documentation/devicetree/bindings/iio/accel/adi,adxl345.yaml
> > >  F:     drivers/input/misc/adxl34x.c
> > >
> > > +ADXL355 THREE-AXIS DIGITAL ACCELEROMETER DRIVER
> > > +M:     Puranjay Mohan <puranjay12@gmail.com>
> > > +L:     linux-iio@vger.kernel.org
> > > +S:     Supported
> > > +F:     drivers/iio/accel/adxl34x.c
> > > +F:     Documentation/devicetree/bindings/iio/accel/adi,adxl355.yaml
> > > +
> > >  ADXL372 THREE-AXIS DIGITAL ACCELEROMETER DRIVER
> > >  M:     Michael Hennerich <michael.hennerich@analog.com>
> > >  S:     Supported
> > > diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
> > > index cceda3cec..9a65353a4 100644
> > > --- a/drivers/iio/accel/Kconfig
> > > +++ b/drivers/iio/accel/Kconfig
> > > @@ -61,6 +61,35 @@ config ADXL345_SPI
> > >           will be called adxl345_spi and you will also get adxl345_core
> > >           for the core module.
> > >
> > > +config ADXL355
> > > +       tristate
> > > +
> > > +config ADXL355_I2C
> > > +       tristate "Analog Devices ADXL355 3-Axis Digital Accelerometer I2C Driver"
> > > +       depends on I2C
> > > +       select ADXL355
> > > +       select REGMAP_I2C
> > > +       help
> > > +         Say Y here if you want to build support for the Analog Devices
> > > +         ADXL355 3-axis digital accelerometer.
> > > +
> > > +         To compile this driver as a module, choose M here: the module
> > > +         will be called adxl355_i2c and you will also get adxl355_core
> > > +         for the core module.
> > > +
> > > +config ADXL355_SPI
> > > +       tristate "Analog Devices ADXL355 3-Axis Digital Accelerometer SPI Driver"
> > > +       depends on SPI
> > > +       select ADXL355
> > > +       select REGMAP_SPI
> > > +       help
> > > +         Say Y here if you want to build support for the Analog Devices
> > > +         ADXL355 3-axis digital accelerometer.
> > > +
> > > +         To compile this driver as a module, choose M here: the module
> > > +         will be called adxl355_spi and you will also get adxl355_core
> > > +         for the core module.
> > > +
> > >  config ADXL372
> > >         tristate
> > >         select IIO_BUFFER
> > > diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
> > > index 32cd1342a..0e4721d2d 100644
> > > --- a/drivers/iio/accel/Makefile
> > > +++ b/drivers/iio/accel/Makefile
> > > @@ -9,6 +9,9 @@ obj-$(CONFIG_ADIS16209) += adis16209.o
> > >  obj-$(CONFIG_ADXL345) += adxl345_core.o
> > >  obj-$(CONFIG_ADXL345_I2C) += adxl345_i2c.o
> > >  obj-$(CONFIG_ADXL345_SPI) += adxl345_spi.o
> > > +obj-$(CONFIG_ADXL355) += adxl355_core.o
> > > +obj-$(CONFIG_ADXL355_I2C) += adxl355_i2c.o
> > > +obj-$(CONFIG_ADXL355_SPI) += adxl355_spi.o
> > >  obj-$(CONFIG_ADXL372) += adxl372.o
> > >  obj-$(CONFIG_ADXL372_I2C) += adxl372_i2c.o
> > >  obj-$(CONFIG_ADXL372_SPI) += adxl372_spi.o
> > > diff --git a/drivers/iio/accel/adxl355.h b/drivers/iio/accel/adxl355.h
> > > new file mode 100644
> > > index 000000000..e52c294d8
> > > --- /dev/null
> > > +++ b/drivers/iio/accel/adxl355.h
> > > @@ -0,0 +1,83 @@
> > > +/* SPDX-License-Identifier: GPL-2.0-only */
> > > +/*
> > > + * ADXL355 3-Axis Digital Accelerometer
> > > + *
> > > + * Copyright (c) 2021 Puranjay Mohan <puranjay12@gmail.com>
> > > + */
> > > +
> > > +#ifndef _ADXL355_H_
> > > +#define _ADXL355_H_
> > > +
> > > +#include <linux/regmap.h>
> > > +
> > > +/* ADXL355 Register Definitions */
> > > +#define ADXL355_DEVID_AD       0x00
> > > +#define ADXL355_DEVID_MST      0x01
> > > +#define ADXL355_PARTID         0x02
> > > +#define ADXL355_REVID          0x03
> > > +#define ADXL355_STATUS         0x04
> > > +#define ADXL355_FIFO_ENTRIES   0x05
> > > +#define ADXL355_TEMP2          0x06
> > > +#define ADXL355_XDATA3         0x08
> > > +#define ADXL355_YDATA3         0x0B
> > > +#define ADXL355_ZDATA3         0x0E
> > > +#define ADXL355_FIFO_DATA      0x11
> > > +#define ADXL355_OFFSET_X_H     0x1E
> > > +#define ADXL355_OFFSET_Y_H     0x20
> > > +#define ADXL355_OFFSET_Z_H     0x22
> > > +#define ADXL355_ACT_EN         0x24
> > > +#define ADXL355_ACT_THRESH_H   0x25
> > > +#define ADXL355_ACT_THRESH_L   0x26
> > > +#define ADXL355_ACT_COUNT      0x27
> > > +#define ADXL355_FILTER         0x28
> > > +#define ADXL355_FIFO_SAMPLES   0x29
> > > +#define ADXL355_INT_MAP                0x2A
> > > +#define ADXL355_SYNC           0x2B
> > > +#define ADXL355_RANGE          0x2C
> > > +#define ADXL355_POWER_CTL      0x2D
> > > +#define ADXL355_SELF_TEST      0x2E
> > > +#define ADXL355_RESET          0x2F
> > > +
> > > +#define ADXL355_DEVID_AD_VAL   0xAD
> > > +#define ADXL355_DEVID_MST_VAL  0x1D
> > > +#define ADXL355_PARTID_VAL     0xED
> > > +#define ADXL355_REVID_VAL      0x01
> > > +#define ADXL355_RESET_CODE     0x52
> > > +
> > > +#define ADXL355_POWER_CTL_MODE_MSK     GENMASK(1, 0)
> > > +
> > > +#define ADXL355_FILTER_ODR_MSK                 GENMASK(3, 0)
> > > +#define ADXL355_FILTER_ODR_MODE(x)             ((x) & 0xF)
> > > +#define ADXL355_FILTER_HPF_MSK                 GENMASK(6, 4)
> > > +#define ADXL355_FILTER_HPF_MODE(x)             (((x) & 0x7) << 4)
> > > +
> > > +/*
> > > + * The datasheet defines an intercept of 1885 LSB at 25 degC
> > > + * and a slope of -9.05 LSB/C. The following formula can be used to find the
> > > + * temperature:
> > > + * Temp = ((RAW - 1885)/(-9.05)) + 25 but this doesn't follow the format of
> > > + * the IIO which is Temp = (RAW + OFFSET) * SCALE. Hence using some rearranging
> > > + * we get the scale as -110.49723 and offset as -2111.25
> > > + */
> > > +#define TEMP_SCALE_VAL -110
> > > +#define TEMP_SCALE_VAL2 497238
> > > +#define TEMP_OFFSET_VAL -2111
> > > +#define TEMP_OFFSET_VAL2 250000
> > > +
> > > +/*
> > > + * At +/- 2g with 20-bit resolution, scale is given in datasheet as
> > > + * 3.9ug/LSB = 0.0000039 * 9.80665 = 0.00003824593 m/s^2
> > > + */
> > > +#define ADXL355_NSCALE 38245
> > > +
> > > +extern const struct regmap_range adxl355_read_reg_range[];
> >
> > This likely fails because adxl355_read_reg_range is re-defined as static.
> >
> I forgot to remove these, realized it just after sending the patch.
>
> > > +
> > > +extern const struct regmap_access_table adxl355_readable_regs_tbl;
> > > +
> > > +extern const struct regmap_range adxl355_write_reg_range[];
> > > +
> > > +extern const struct regmap_access_table adxl355_writeable_regs_tbl;
> > > +
> > > +int adxl355_core_probe(struct device *dev, struct regmap *regmap,
> > > +                      const char *name);
> > > +#endif /* _ADXL355_H_ */
> > > diff --git a/drivers/iio/accel/adxl355_core.c b/drivers/iio/accel/adxl355_core.c
> > > new file mode 100644
> > > index 000000000..ff90e5aa6
> > > --- /dev/null
> > > +++ b/drivers/iio/accel/adxl355_core.c
> > > @@ -0,0 +1,541 @@
> > > +// SPDX-License-Identifier: GPL-2.0-only
> > > +/*
> > > + * ADXL355 3-Axis Digital Accelerometer IIO core driver
> > > + *
> > > + * Copyright (c) 2021 Puranjay Mohan <puranjay12@gmail.com>
> > > + *
> > > + * Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/adxl354_adxl355.pdf
> > > + */
> > > +
> > > +#include <linux/iio/iio.h>
> > > +#include <linux/iio/sysfs.h>
> > > +#include <linux/limits.h>
> > > +#include <linux/math64.h>
> > > +#include <linux/module.h>
> > > +#include <linux/regmap.h>
> > > +
> > > +#include "adxl355.h"
> > > +
> > > +static const struct regmap_range adxl355_read_reg_range[] = {
> > > +       regmap_reg_range(ADXL355_DEVID_AD, ADXL355_FIFO_DATA),
> > > +       regmap_reg_range(ADXL355_OFFSET_X_H, ADXL355_SELF_TEST)
> > > +};
> > > +
> > > +const struct regmap_access_table adxl355_readable_regs_tbl = {
> > > +       .yes_ranges = adxl355_read_reg_range,
> > > +       .n_yes_ranges = ARRAY_SIZE(adxl355_read_reg_range),
> > > +};
> > > +EXPORT_SYMBOL_GPL(adxl355_readable_regs_tbl);
> > > +
> > > +static const struct regmap_range adxl355_write_reg_range[] = {
> > > +       regmap_reg_range(ADXL355_OFFSET_X_H, ADXL355_RESET)
> > > +};
> > > +
> > > +const struct regmap_access_table adxl355_writeable_regs_tbl = {
> > > +       .yes_ranges = adxl355_write_reg_range,
> > > +       .n_yes_ranges = ARRAY_SIZE(adxl355_write_reg_range),
> > > +};
> > > +EXPORT_SYMBOL_GPL(adxl355_writeable_regs_tbl);
> > > +
> > > +enum adxl355_op_mode {
> > > +       ADXL355_MEASUREMENT,
> > > +       ADXL355_STANDBY,
> > > +       ADXL355_TEMP_OFF
> > > +};
> > > +
> > > +enum adxl355_odr {
> > > +       ADXL355_ODR_4000HZ,
> > > +       ADXL355_ODR_2000HZ,
> > > +       ADXL355_ODR_1000HZ,
> > > +       ADXL355_ODR_500HZ,
> > > +       ADXL355_ODR_250HZ,
> > > +       ADXL355_ODR_125HZ,
> > > +       ADXL355_ODR_62_5HZ,
> > > +       ADXL355_ODR_31_25HZ,
> > > +       ADXL355_ODR_15_625HZ,
> > > +       ADXL355_ODR_7_813HZ,
> > > +       ADXL355_ODR_3_906HZ
> > > +};
> > > +
> > > +enum adxl355_hpf_3db {
> > > +       ADXL355_HPF_OFF,
> > > +       ADXL355_HPF_24_7,
> > > +       ADXL355_HPF_6_2084,
> > > +       ADXL355_HPF_1_5545,
> > > +       ADXL355_HPF_0_3862,
> > > +       ADXL355_HPF_0_0954,
> > > +       ADXL355_HPF_0_0238
> > > +};
> > > +
> > > +static const int adxl355_odr_table[][2] = {
> > > +       [0] = {4000, 0},
> > > +       [1] = {2000, 0},
> > > +       [2] = {1000, 0},
> > > +       [3] = {500, 0},
> > > +       [4] = {250, 0},
> > > +       [5] = {125, 0},
> > > +       [6] = {62, 500000},
> > > +       [7] = {31, 250000},
> > > +       [8] = {15, 625000},
> > > +       [9] = {7, 813000},
> > > +       [10] = {3, 906000}
> > > +};
> > > +
> > > +static const int adxl355_hpf_3db_multipliers[] = {
> > > +       0,
> > > +       247000,
> > > +       62084,
> > > +       15545,
> > > +       3862,
> > > +       954,
> > > +       238
> > > +};
> > > +
> > > +struct adxl355_data {
> > > +       struct regmap *regmap;
> > > +       struct device *dev;
> > > +       struct mutex lock; /* lock to protect op_mode */
> > > +       enum adxl355_op_mode op_mode;
> > > +       enum adxl355_odr odr;
> > > +       enum adxl355_hpf_3db hpf_3db;
> > > +       int x_calibbias;
> > > +       int y_calibbias;
> > > +       int z_calibbias;
> > > +       int adxl355_hpf_3db_table[7][2];
> > > +};
> > > +
> > > +static int adxl355_set_op_mode(struct adxl355_data *data,
> > > +                              enum adxl355_op_mode op_mode)
> > > +{
> > > +       int ret;
> > > +
> > > +       if (data->op_mode == op_mode)
> > > +               return 0;
> > > +
> > > +       ret = regmap_update_bits(data->regmap, ADXL355_POWER_CTL,
> > > +                                ADXL355_POWER_CTL_MODE_MSK, op_mode);
> > > +       if (ret < 0)
> > > +               return ret;
> > > +
> > > +       data->op_mode = op_mode;
> > > +
> > > +       return ret;
> > > +}
> > > +
> > > +static void adxl355_fill_3db_frequency_table(struct adxl355_data *data)
> > > +{
> > > +       int i;
> > > +       u64 rem;
> > > +       u64 div;
> > > +       u32 multiplier;
> > > +       u64 odr = mul_u64_u32_shr(adxl355_odr_table[data->odr][0], 1000000, 0) +
> > > +                                       adxl355_odr_table[data->odr][1];
> > > +
> > > +       for (i = 0; i < ARRAY_SIZE(adxl355_hpf_3db_multipliers); i++) {
> > > +               multiplier = adxl355_hpf_3db_multipliers[i];
> > > +               div = div64_u64_rem(mul_u64_u32_shr(odr, multiplier, 0),
> > > +                                   100000000000000UL, &rem);
> > > +
> > > +               data->adxl355_hpf_3db_table[i][0] = div;
> > > +               data->adxl355_hpf_3db_table[i][1] = div_u64(rem, 100000000);
> > > +       }
> > > +}
> > > +
> > > +static int adxl355_setup(struct adxl355_data *data)
> > > +{
> > > +       unsigned int regval;
> > > +       int ret;
> > > +
> > > +       ret = regmap_read(data->regmap, ADXL355_DEVID_AD, &regval);
> > > +       if (ret < 0)
> > > +               return ret;
> > > +
> > > +       if (regval != ADXL355_DEVID_AD_VAL) {
> > > +               dev_err(data->dev, "Invalid ADI ID 0x%02x\n", regval);
> > > +               return -ENODEV;
> > > +       }
> > > +
> > > +       ret = regmap_read(data->regmap, ADXL355_DEVID_MST, &regval);
> > > +       if (ret < 0)
> > > +               return ret;
> > > +
> > > +       if (regval != ADXL355_DEVID_MST_VAL) {
> > > +               dev_err(data->dev, "Invalid MEMS ID 0x%02x\n", regval);
> > > +               return -ENODEV;
> > > +       }
> > > +
> > > +       ret = regmap_read(data->regmap, ADXL355_PARTID, &regval);
> > > +       if (ret < 0)
> > > +               return ret;
> > > +
> > > +       if (regval != ADXL355_PARTID_VAL) {
> > > +               dev_err(data->dev, "Invalid DEV ID 0x%02x\n", regval);
> > > +               return -ENODEV;
> > > +       }
> > > +
> > > +       /*
> > > +        * Perform a software reset to make sure the device is in a consistent
> > > +        * state after start up.
> > > +        */
> > > +       ret = regmap_write(data->regmap, ADXL355_RESET, ADXL355_RESET_CODE);
> > > +       if (ret < 0)
> > > +               return ret;
> > > +
> > > +       adxl355_fill_3db_frequency_table(data);
> > > +
> > > +       return adxl355_set_op_mode(data, ADXL355_MEASUREMENT);
> > > +}
> > > +
> > > +static int adxl355_get_temp_data(struct adxl355_data *data,
> > > +                                u8 addr, __be16 *out)
> > > +{
> > > +       return regmap_bulk_read(data->regmap, addr, out, sizeof(*out));
> > > +}
> > > +
> > > +static int adxl355_read_axis(struct adxl355_data *data, u8 addr)
> > > +{
> > > +       __be32 regval;
> > > +       int ret;
> > > +
> > > +       ret = regmap_bulk_read(data->regmap, addr, &regval, 3);
> > > +       if (ret < 0)
> > > +               return ret;
> > > +
> > > +       return be32_to_cpu(regval) >> 8;
> > > +}
> > > +
> > > +static int adxl355_find_match(const int (*freq_tbl)[2], const int n,
> > > +                             const int val, const int val2)
> > > +{
> > > +       int i;
> > > +
> > > +       for (i = 0; i < n; i++) {
> > > +               if (freq_tbl[i][0] == val && freq_tbl[i][1] == val2)
> > > +                       return i;
> > > +       }
> > > +
> > > +       return -EINVAL;
> > > +}
> > > +
> > > +static int adxl355_set_odr(struct adxl355_data *data,
> > > +                          enum adxl355_odr odr)
> > > +{
> > > +       int ret = 0;
> > > +
> > > +       mutex_lock(&data->lock);
> > > +
> > > +       if (data->odr == odr)
> > > +               goto out_unlock;
> > > +
> > > +       ret = adxl355_set_op_mode(data, ADXL355_STANDBY);
> > > +       if (ret < 0)
> > > +               goto out_unlock;
> > > +
> > > +       ret = regmap_update_bits(data->regmap, ADXL355_FILTER,
> > > +                                ADXL355_FILTER_ODR_MSK,
> > > +                                ADXL355_FILTER_ODR_MODE(odr));
> > > +       if (!ret) {
> > > +               data->odr = odr;
> > > +               adxl355_fill_3db_frequency_table(data);
> > > +       }
> > > +
> > > +out_unlock:
> > > +       ret = adxl355_set_op_mode(data, ADXL355_MEASUREMENT);
> > > +       mutex_unlock(&data->lock);
> > > +       return ret;
> > > +}
> > > +
> > > +static int adxl355_set_hpf_3db(struct adxl355_data *data,
> > > +                              enum adxl355_hpf_3db hpf)
> > > +{
> > > +       int ret = 0;
> > > +
> > > +       mutex_lock(&data->lock);
> > > +
> > > +       if (data->hpf_3db == hpf)
> > > +               goto out_unlock;
> > > +
> > > +       ret = adxl355_set_op_mode(data, ADXL355_STANDBY);
> > > +       if (ret < 0)
> > > +               goto out_unlock;
> > > +
> > > +       ret = regmap_update_bits(data->regmap, ADXL355_FILTER,
> > > +                                ADXL355_FILTER_HPF_MSK,
> > > +                                ADXL355_FILTER_HPF_MODE(hpf));
> > > +       if (!ret)
> > > +               data->hpf_3db = hpf;
> > > +
> > > +out_unlock:
> > > +       ret = adxl355_set_op_mode(data, ADXL355_MEASUREMENT);
> > > +       mutex_unlock(&data->lock);
> > > +       return ret;
> > > +}
> > > +
> > > +static int adxl355_set_calibbias(struct adxl355_data *data,
> > > +                                int scan_index, int calibbias)
> > > +{
> > > +       int ret = 0;
> > > +       __be16 reg = cpu_to_be16(calibbias);
> > > +
> > > +       mutex_lock(&data->lock);
> > > +
> > > +       ret = adxl355_set_op_mode(data, ADXL355_STANDBY);
> > > +       if (ret < 0)
> > > +               goto out_unlock;
> > > +
> > > +       switch (scan_index) {
> > > +       case 0:
> > > +               ret = regmap_bulk_write(data->regmap, ADXL355_OFFSET_X_H,
> > > +                                       &reg, 2);
> > > +               if (ret < 0)
> > > +                       goto out_unlock;
> > > +               data->x_calibbias = calibbias;
> > > +               break;
> > > +       case 1:
> > > +               ret = regmap_bulk_write(data->regmap, ADXL355_OFFSET_Y_H,
> > > +                                       &reg, 2);
> > > +               if (ret < 0)
> > > +                       goto out_unlock;
> > > +               data->y_calibbias = calibbias;
> > > +               break;
> > > +       case 2:
> > > +               ret = regmap_bulk_write(data->regmap, ADXL355_OFFSET_Z_H,
> > > +                                       &reg, 2);
> > > +               if (ret < 0)
> > > +                       goto out_unlock;
> > > +               data->z_calibbias = calibbias;
> > > +               break;
> > > +       default:
> > > +               ret = -EINVAL;
> > > +               break;
> > > +       }
> > > +
> > > +out_unlock:
> > > +       ret = adxl355_set_op_mode(data, ADXL355_MEASUREMENT);
> > > +       mutex_unlock(&data->lock);
> > > +       return ret;
> > > +}
> > > +
> > > +static int adxl355_read_raw(struct iio_dev *indio_dev,
> > > +                           struct iio_chan_spec const *chan,
> > > +                           int *val, int *val2, long mask)
> > > +{
> > > +       struct adxl355_data *data = iio_priv(indio_dev);
> > > +       int ret;
> > > +       __be16 out;
> > > +
> > > +       switch (mask) {
> > > +       case IIO_CHAN_INFO_RAW:
> > > +               switch (chan->type) {
> > > +               case IIO_TEMP:
> > > +                       ret = adxl355_get_temp_data(data, chan->address, &out);
> > > +                       if (ret < 0)
> > > +                               break;
> > > +                       *val = be16_to_cpu(out);
> > > +                       ret = IIO_VAL_INT;
> > > +                       break;
> > > +
> > > +               case IIO_ACCEL:
> > > +                       ret = adxl355_read_axis(data, chan->address);
> > > +                       if (ret < 0)
> > > +                               break;
> > > +                       *val = sign_extend32(ret >> (chan->scan_type.shift),
> > > +                                            chan->scan_type.realbits - 1);
> > > +                       ret = IIO_VAL_INT;
> > > +                       break;
> > > +
> > > +               default:
> > > +                       ret = -EINVAL;
> > > +                       break;
> >
> > Since this will get an update anyway.
> > This switch statement could be replaced with direct  return -EINVAL and similar.
> > Other switch statements seem to do it.
> > It would make this consistent with the other below.
>
> will change it in the next version.
> >
> > > +               }
> > > +
> > > +               return ret;
> > > +       case IIO_CHAN_INFO_SCALE:
> > > +               switch (chan->type) {
> > > +               case IIO_TEMP:
> > > +                       *val = TEMP_SCALE_VAL;
> > > +                       *val2 = TEMP_SCALE_VAL2;
> > > +                       return IIO_VAL_INT_PLUS_MICRO;
> > > +               case IIO_ACCEL:
> > > +                       *val = 0;
> > > +                       *val2 = ADXL355_NSCALE;
> > > +                       return IIO_VAL_INT_PLUS_NANO;
> > > +               default:
> > > +                       return -EINVAL;
> > > +               }
> > > +       case IIO_CHAN_INFO_OFFSET:
> > > +               *val = TEMP_OFFSET_VAL;
> > > +               *val2 = TEMP_OFFSET_VAL2;
> > > +               return IIO_VAL_INT_PLUS_MICRO;
> > > +       case IIO_CHAN_INFO_CALIBBIAS:
> > > +               if (chan->scan_index == 0)
> > > +                       *val = data->x_calibbias;
> > > +               else if (chan->scan_index == 1)
> > > +                       *val = data->y_calibbias;
> > > +               else
> > > +                       *val = data->z_calibbias;
> > > +               *val = sign_extend32(*val, 15);
> > > +               return IIO_VAL_INT;
> > > +       case IIO_CHAN_INFO_SAMP_FREQ:
> > > +               *val = adxl355_odr_table[data->odr][0];
> > > +               *val2 = adxl355_odr_table[data->odr][1];
> > > +               return IIO_VAL_INT_PLUS_MICRO;
> > > +       case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
> > > +               *val = data->adxl355_hpf_3db_table[data->hpf_3db][0];
> > > +               *val2 = data->adxl355_hpf_3db_table[data->hpf_3db][1];
> > > +               return IIO_VAL_INT_PLUS_MICRO;
> > > +       }
> > > +       return -EINVAL;
> > > +}
> > > +
> > > +static int adxl355_write_raw(struct iio_dev *indio_dev,
> > > +                            struct iio_chan_spec const *chan,
> > > +                            int val, int val2, long mask)
> > > +{
> > > +       struct adxl355_data *data = iio_priv(indio_dev);
> > > +       int odr_idx, hpf_idx, calibbias;
> > > +
> > > +       switch (mask) {
> > > +       case IIO_CHAN_INFO_SAMP_FREQ:
> > > +               odr_idx = adxl355_find_match(adxl355_odr_table,
> > > +                                            ARRAY_SIZE(adxl355_odr_table),
> > > +                                            val, val2);
> > > +               if (odr_idx < 0)
> > > +                       return odr_idx;
> > > +
> > > +               return adxl355_set_odr(data, odr_idx);
> > > +       case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
> > > +               hpf_idx = adxl355_find_match(data->adxl355_hpf_3db_table,
> > > +                                       ARRAY_SIZE(data->adxl355_hpf_3db_table),
> > > +                                            val, val2);
> > > +               if (hpf_idx < 0)
> > > +                       return hpf_idx;
> > > +
> > > +               return adxl355_set_hpf_3db(data, hpf_idx);
> > > +       case IIO_CHAN_INFO_CALIBBIAS:
> > > +               calibbias = clamp_t(int, val, S16_MIN, S16_MAX);
> > > +
> > > +               return adxl355_set_calibbias(data, chan->scan_index, calibbias);
> > > +       default:
> > > +               return -EINVAL;
> > > +       }
> > > +}
> > > +
> > > +static int adxl355_read_avail(struct iio_dev *indio_dev,
> > > +                             struct iio_chan_spec const *chan,
> > > +                             const int **vals, int *type, int *length,
> > > +                             long mask)
> > > +{
> > > +       struct adxl355_data *data = iio_priv(indio_dev);
> > > +
> > > +       switch (mask) {
> > > +       case IIO_CHAN_INFO_SAMP_FREQ:
> > > +               *vals = (const int *)adxl355_odr_table;
> > > +               *type = IIO_VAL_INT_PLUS_MICRO;
> > > +               /* Values are stored in a 2D matrix */
> > > +               *length = ARRAY_SIZE(adxl355_odr_table) * 2;
> > > +
> > > +               return IIO_AVAIL_LIST;
> > > +       case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
> > > +               *vals = (const int *)(data->adxl355_hpf_3db_table);
> > > +               *type = IIO_VAL_INT_PLUS_MICRO;
> > > +               /* Values are stored in a 2D matrix */
> > > +               *length = ARRAY_SIZE(data->adxl355_hpf_3db_table) * 2;
> > > +
> > > +               return IIO_AVAIL_LIST;
> > > +       default:
> > > +               return -EINVAL;
> > > +       }
> > > +}
> > > +
> > > +static const unsigned long adxl355_avail_scan_masks[] = {
> > > +       GENMASK(3, 0),
> > > +       0
> > > +};
> > > +
> > > +static const struct iio_info adxl355_info = {
> > > +       .read_raw       = adxl355_read_raw,
> > > +       .write_raw      = adxl355_write_raw,
> > > +       .read_avail     = &adxl355_read_avail
> > > +};
> > > +
> > > +#define ADXL355_ACCEL_CHANNEL(index, reg, axis) {                      \
> > > +       .type = IIO_ACCEL,                                              \
> > > +       .address = reg,                                                 \
> > > +       .modified = 1,                                                  \
> > > +       .channel2 = IIO_MOD_##axis,                                     \
> > > +       .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |                  \
> > > +                             BIT(IIO_CHAN_INFO_CALIBBIAS),             \
> > > +       .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |          \
> > > +                                   BIT(IIO_CHAN_INFO_SAMP_FREQ) |      \
> > > +               BIT(IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY),      \
> > > +       .info_mask_shared_by_type_available =                           \
> > > +               BIT(IIO_CHAN_INFO_SAMP_FREQ) |                          \
> > > +               BIT(IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY),      \
> > > +       .scan_index = index,                                            \
> > > +       .scan_type = {                                                  \
> > > +               .sign = 's',                                            \
> > > +               .realbits = 20,                                         \
> > > +               .storagebits = 32,                                      \
> > > +               .shift = 4,                                             \
> > > +               .endianness = IIO_BE,                                   \
> > > +       }                                                               \
> > > +}
> > > +
> > > +static const struct iio_chan_spec adxl355_channels[] = {
> > > +       ADXL355_ACCEL_CHANNEL(0, ADXL355_XDATA3, X),
> > > +       ADXL355_ACCEL_CHANNEL(1, ADXL355_YDATA3, Y),
> > > +       ADXL355_ACCEL_CHANNEL(2, ADXL355_ZDATA3, Z),
> > > +       {
> > > +               .type = IIO_TEMP,
> > > +               .address = ADXL355_TEMP2,
> > > +               .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> > > +                                     BIT(IIO_CHAN_INFO_SCALE) |
> > > +                                     BIT(IIO_CHAN_INFO_OFFSET),
> > > +               .scan_index = 3,
> > > +               .scan_type = {
> > > +                       .sign = 's',
> > > +                       .realbits = 12,
> > > +                       .storagebits = 16,
> > > +                       .endianness = IIO_BE,
> > > +               },
> > > +       }
> > > +};
> > > +
> > > +int adxl355_core_probe(struct device *dev, struct regmap *regmap,
> > > +                      const char *name)
> > > +{
> > > +       struct adxl355_data *data;
> > > +       struct iio_dev *indio_dev;
> > > +       int ret;
> > > +
> > > +       indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
> > > +       if (!indio_dev)
> > > +               return -ENOMEM;
> > > +
> > > +       data = iio_priv(indio_dev);
> > > +       data->regmap = regmap;
> > > +       data->dev = dev;
> > > +       data->op_mode = ADXL355_STANDBY;
> > > +       mutex_init(&data->lock);
> > > +
> > > +       indio_dev->name = name;
> > > +       indio_dev->info = &adxl355_info;
> > > +       indio_dev->modes = INDIO_DIRECT_MODE;
> > > +       indio_dev->channels = adxl355_channels;
> > > +       indio_dev->num_channels = ARRAY_SIZE(adxl355_channels);
> > > +       indio_dev->available_scan_masks = adxl355_avail_scan_masks;
> > > +
> > > +       ret = adxl355_setup(data);
> > > +       if (ret < 0) {
> > > +               dev_err(dev, "ADXL355 setup failed\n");
> > > +               return ret;
> > > +       }
> > > +
> > > +       return devm_iio_device_register(dev, indio_dev);
> > > +}
> > > +EXPORT_SYMBOL_GPL(adxl355_core_probe);
> > > +
> > > +MODULE_AUTHOR("Puranjay Mohan <puranjay12@gmail.com>");
> > > +MODULE_DESCRIPTION("ADXL355 3-Axis Digital Accelerometer core driver");
> > > +MODULE_LICENSE("GPL v2");
> > > diff --git a/drivers/iio/accel/adxl355_i2c.c b/drivers/iio/accel/adxl355_i2c.c
> > > new file mode 100644
> > > index 000000000..1c9764129
> > > --- /dev/null
> > > +++ b/drivers/iio/accel/adxl355_i2c.c
> > > @@ -0,0 +1,63 @@
> > > +// SPDX-License-Identifier: GPL-2.0-only
> > > +/*
> > > + * ADXL355 3-Axis Digital Accelerometer I2C driver
> > > + *
> > > + * Copyright (c) 2021 Puranjay Mohan <puranjay12@gmail.com>
> > > + */
> > > +
> > > +#include <linux/i2c.h>
> > > +#include <linux/module.h>
> > > +#include <linux/regmap.h>
> > > +
> > > +#include "adxl355.h"
> > > +
> > > +static const struct regmap_config adxl355_i2c_regmap_config = {
> > > +       .reg_bits = 8,
> > > +       .val_bits = 8,
> > > +       .max_register = 0x2F,
> > > +       .rd_table = &adxl355_readable_regs_tbl,
> > > +       .wr_table = &adxl355_writeable_regs_tbl
> > > +};
> > > +
> > > +static int adxl355_i2c_probe(struct i2c_client *client)
> > > +{
> > > +       struct regmap *regmap;
> > > +
> > > +       regmap = devm_regmap_init_i2c(client, &adxl355_i2c_regmap_config);
> > > +       if (IS_ERR(regmap)) {
> > > +               dev_err(&client->dev, "Error initializing i2c regmap: %ld\n",
> > > +                       PTR_ERR(regmap));
> > > +               return PTR_ERR(regmap);
> > > +       }
> > > +
> > > +       return adxl355_core_probe(&client->dev, regmap, client->name);
> > > +}
> > > +
> > > +static const struct i2c_device_id adxl355_i2c_id[] = {
> > > +       { "adxl355", 0 },
> > > +       { }
> > > +};
> > > +
> > > +MODULE_DEVICE_TABLE(i2c, adxl355_i2c_id);
> > > +
> > > +static const struct of_device_id adxl355_of_match[] = {
> > > +       { .compatible = "adi,adxl355" },
> > > +       { },
> >
> > comma can be removed from null terminator
> >
> > > +};
> > > +
> > > +MODULE_DEVICE_TABLE(of, adxl355_of_match);
> > > +
> > > +static struct i2c_driver adxl355_i2c_driver = {
> > > +       .driver = {
> > > +               .name   = "adxl355_i2c",
> > > +               .of_match_table = adxl355_of_match,
> > > +       },
> > > +       .probe_new      = adxl355_i2c_probe,
> > > +       .id_table       = adxl355_i2c_id,
> > > +};
> > > +
> > > +module_i2c_driver(adxl355_i2c_driver);
> > > +
> > > +MODULE_AUTHOR("Puranjay Mohan <puranjay12@gmail.com>");
> > > +MODULE_DESCRIPTION("ADXL355 3-Axis Digital Accelerometer I2C driver");
> > > +MODULE_LICENSE("GPL v2");
> > > diff --git a/drivers/iio/accel/adxl355_spi.c b/drivers/iio/accel/adxl355_spi.c
> > > new file mode 100644
> > > index 000000000..ae02cbfad
> > > --- /dev/null
> > > +++ b/drivers/iio/accel/adxl355_spi.c
> > > @@ -0,0 +1,66 @@
> > > +// SPDX-License-Identifier: GPL-2.0-only
> > > +/*
> > > + * ADXL355 3-Axis Digital Accelerometer SPI driver
> > > + *
> > > + * Copyright (c) 2021 Puranjay Mohan <puranjay12@gmail.com>
> > > + */
> > > +
> > > +#include <linux/module.h>
> > > +#include <linux/regmap.h>
> > > +#include <linux/spi/spi.h>
> > > +
> > > +#include "adxl355.h"
> > > +
> > > +static const struct regmap_config adxl355_spi_regmap_config = {
> > > +       .reg_bits = 7,
> > > +       .pad_bits = 1,
> > > +       .val_bits = 8,
> > > +       .read_flag_mask = BIT(0),
> > > +       .max_register = 0x2F,
> > > +       .rd_table = &adxl355_readable_regs_tbl,
> > > +       .wr_table = &adxl355_writeable_regs_tbl
> > > +};
> > > +
> > > +static int adxl355_spi_probe(struct spi_device *spi)
> > > +{
> > > +       const struct spi_device_id *id = spi_get_device_id(spi);
> > > +       struct regmap *regmap;
> > > +
> > > +       regmap = devm_regmap_init_spi(spi, &adxl355_spi_regmap_config);
> > > +       if (IS_ERR(regmap)) {
> > > +               dev_err(&spi->dev, "Error initializing spi regmap: %ld\n",
> > > +                       PTR_ERR(regmap));
> > > +               return PTR_ERR(regmap);
> > > +       }
> > > +
> > > +       return adxl355_core_probe(&spi->dev, regmap, id->name);
> > > +}
> > > +
> > > +static const struct spi_device_id adxl355_spi_id[] = {
> > > +       { "adxl355", 0 },
> > > +       { }
> > > +};
> > > +
> > > +MODULE_DEVICE_TABLE(spi, adxl355_spi_id);
> > > +
> > > +static const struct of_device_id adxl355_of_match[] = {
> > > +       { .compatible = "adi,adxl355" },
> > > +       { },
> >
> > comma can be removed from null terminator
> >
> > > +};
> > > +
> > > +MODULE_DEVICE_TABLE(of, adxl355_of_match);
> > > +
> > > +static struct spi_driver adxl355_spi_driver = {
> > > +       .driver = {
> > > +               .name   = "adxl355_spi",
> > > +               .of_match_table = adxl355_of_match,
> > > +       },
> > > +       .probe          = adxl355_spi_probe,
> > > +       .id_table       = adxl355_spi_id,
> > > +};
> > > +
> > > +module_spi_driver(adxl355_spi_driver);
> > > +
> > > +MODULE_AUTHOR("Puranjay Mohan <puranjay12@gmail.com>");
> > > +MODULE_DESCRIPTION("ADXL355 3-Axis Digital Accelerometer SPI driver");
> > > +MODULE_LICENSE("GPL v2");
> > > --
> > > 2.30.1
> > >
>
>
>
> --
> Thanks and Regards
>
> Yours Truly,
>
> Puranjay Mohan

Re: [PATCH v1 2/2] iio: accel: Add driver support for ADXL355

[kernel test robot]

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Hi Puranjay,

I love your patch! Yet something to improve:

[auto build test ERROR on iio/togreg]
[also build test ERROR on robh/for-next linus/master v5.14-rc2 next-20210721]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Puranjay-Mohan/iio-accel-add-support-for-ADXL355/20210721-180632
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg
config: m68k-allmodconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 10.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/1abb9f2f7fa2b5ed06f84a705806b1b907532bfa
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Puranjay-Mohan/iio-accel-add-support-for-ADXL355/20210721-180632
        git checkout 1abb9f2f7fa2b5ed06f84a705806b1b907532bfa
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross O=build_dir ARCH=m68k SHELL=/bin/bash drivers/iio/accel/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> drivers/iio/accel/adxl355_core.c:19:34: error: static declaration of 'adxl355_read_reg_range' follows non-static declaration
      19 | static const struct regmap_range adxl355_read_reg_range[] = {
         |                                  ^~~~~~~~~~~~~~~~~~~~~~
   In file included from drivers/iio/accel/adxl355_core.c:17:
   drivers/iio/accel/adxl355.h:73:34: note: previous declaration of 'adxl355_read_reg_range' was here
      73 | extern const struct regmap_range adxl355_read_reg_range[];
         |                                  ^~~~~~~~~~~~~~~~~~~~~~
>> drivers/iio/accel/adxl355_core.c:30:34: error: static declaration of 'adxl355_write_reg_range' follows non-static declaration
      30 | static const struct regmap_range adxl355_write_reg_range[] = {
         |                                  ^~~~~~~~~~~~~~~~~~~~~~~
   In file included from drivers/iio/accel/adxl355_core.c:17:
   drivers/iio/accel/adxl355.h:77:34: note: previous declaration of 'adxl355_write_reg_range' was here
      77 | extern const struct regmap_range adxl355_write_reg_range[];
         |                                  ^~~~~~~~~~~~~~~~~~~~~~~


vim +/adxl355_read_reg_range +19 drivers/iio/accel/adxl355_core.c

    18	
  > 19	static const struct regmap_range adxl355_read_reg_range[] = {
    20		regmap_reg_range(ADXL355_DEVID_AD, ADXL355_FIFO_DATA),
    21		regmap_reg_range(ADXL355_OFFSET_X_H, ADXL355_SELF_TEST)
    22	};
    23	
    24	const struct regmap_access_table adxl355_readable_regs_tbl = {
    25		.yes_ranges = adxl355_read_reg_range,
    26		.n_yes_ranges = ARRAY_SIZE(adxl355_read_reg_range),
    27	};
    28	EXPORT_SYMBOL_GPL(adxl355_readable_regs_tbl);
    29	
  > 30	static const struct regmap_range adxl355_write_reg_range[] = {
    31		regmap_reg_range(ADXL355_OFFSET_X_H, ADXL355_RESET)
    32	};
    33	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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