[PATCH v2 3/3] drivers: iio: accel: Add support for ADXL359 device

From: Ramona Bolboaca
Date: Mon Oct 31 2022 - 06:53:06 EST

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Add support for ADXL359 device in already existing ADXL355 driver.

Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/adxl359.pdf
Signed-off-by: Ramona Bolboaca <ramona.bolboaca@xxxxxxxxxx>
---
changes in v2:
- Added missing spaces in subject
- Added Datasheet tag in commit message
- Removed type field from adxl355_chip_info
- Added fields for acceleration scale and temperature offset in
adxl355_chip_info structure
- Added constant data for acceleration scale and temperature offset specific
to each device in adxl35x_chip_info
- Moved scale and offset documentation to adxl35x_chip_info definition
- Moved device_get_match_data inside if (!chip_data) {} block
drivers/iio/accel/adxl355.h | 21 +++++++-
drivers/iio/accel/adxl355_core.c | 85 +++++++++++++++++++++++++-------
drivers/iio/accel/adxl355_i2c.c | 22 +++++++--
drivers/iio/accel/adxl355_spi.c | 19 +++++--
4 files changed, 120 insertions(+), 27 deletions(-)

diff --git a/drivers/iio/accel/adxl355.h b/drivers/iio/accel/adxl355.h
index 6dd49b13e4fd..3a08a1808e86 100644
--- a/drivers/iio/accel/adxl355.h
+++ b/drivers/iio/accel/adxl355.h
@@ -10,12 +10,31 @@

#include <linux/regmap.h>

+enum adxl355_device_type {
+ ADXL355,
+ ADXL359,
+};
+
+struct adxl355_fractional_type {
+ int integer;
+ int decimal;
+};
+
struct device;

+struct adxl355_chip_info {
+ const char *name;
+ u8 part_id;
+ struct adxl355_fractional_type accel_scale;
+ struct adxl355_fractional_type temp_offset;
+
+};
+
extern const struct regmap_access_table adxl355_readable_regs_tbl;
extern const struct regmap_access_table adxl355_writeable_regs_tbl;
+extern const struct adxl355_chip_info adxl35x_chip_info[];

int adxl355_core_probe(struct device *dev, struct regmap *regmap,
- const char *name);
+ const struct adxl355_chip_info *chip_info);

#endif /* _ADXL355_H_ */
diff --git a/drivers/iio/accel/adxl355_core.c b/drivers/iio/accel/adxl355_core.c
index dd08253d66d0..c501ad9af631 100644
--- a/drivers/iio/accel/adxl355_core.c
+++ b/drivers/iio/accel/adxl355_core.c
@@ -60,6 +60,7 @@
#define ADXL355_DEVID_AD_VAL 0xAD
#define ADXL355_DEVID_MST_VAL 0x1D
#define ADXL355_PARTID_VAL 0xED
+#define ADXL359_PARTID_VAL 0xE9
#define ADXL355_RESET_CODE 0x52

static const struct regmap_range adxl355_read_reg_range[] = {
@@ -83,6 +84,60 @@ const struct regmap_access_table adxl355_writeable_regs_tbl = {
};
EXPORT_SYMBOL_NS_GPL(adxl355_writeable_regs_tbl, IIO_ADXL355);

+const struct adxl355_chip_info adxl35x_chip_info[] = {
+ [ADXL355] = {
+ .name = "adxl355",
+ .part_id = ADXL355_PARTID_VAL,
+ /*
+ * At +/- 2g with 20-bit resolution, scale is given in datasheet
+ * as 3.9ug/LSB = 0.0000039 * 9.80665 = 0.00003824593 m/s^2.
+ */
+ .accel_scale = {
+ .integer = 0,
+ .decimal = 38245,
+ },
+ /*
+ * 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 -110.497238
+ * and offset as -2111.25.
+ */
+ .temp_offset = {
+ .integer = -2111,
+ .decimal = 250000,
+ },
+ },
+ [ADXL359] = {
+ .name = "adxl359",
+ .part_id = ADXL359_PARTID_VAL,
+ /*
+ * At +/- 10g with 20-bit resolution, scale is given in datasheet
+ * as 19.5ug/LSB = 0.0000195 * 9.80665 = 0.0.00019122967 m/s^2.
+ */
+ .accel_scale = {
+ .integer = 0,
+ .decimal = 191229,
+ },
+ /*
+ * The datasheet defines an intercept of 1852 LSB at 25 degC
+ * and a slope of -9.05 LSB/C. The following formula can be used
+ * to find the temperature:
+ * Temp = ((RAW - 1852)/(-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 -110.497238
+ * and offset as -2079.25.
+ */
+ .temp_offset = {
+ .integer = -2079,
+ .decimal = 250000,
+ },
+ },
+};
+EXPORT_SYMBOL_NS_GPL(adxl35x_chip_info, IIO_ADXL355);
+
enum adxl355_op_mode {
ADXL355_MEASUREMENT,
ADXL355_STANDBY,
@@ -162,6 +217,7 @@ static const struct adxl355_chan_info adxl355_chans[] = {
};

struct adxl355_data {
+ const struct adxl355_chip_info *chip_info;
struct regmap *regmap;
struct device *dev;
struct mutex lock; /* lock to protect op_mode */
@@ -456,33 +512,23 @@ static int adxl355_read_raw(struct iio_dev *indio_dev,

case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
- /*
- * 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 -110.497238
- * and offset as -2111.25.
- */
case IIO_TEMP:
+ /* Temperature scale is -110.497238.
+ * See the detailed explanation in adxl35x_chip_info definition above.
+ */
*val = -110;
*val2 = 497238;
return IIO_VAL_INT_PLUS_MICRO;
- /*
- * At +/- 2g with 20-bit resolution, scale is given in datasheet
- * as 3.9ug/LSB = 0.0000039 * 9.80665 = 0.00003824593 m/s^2.
- */
case IIO_ACCEL:
- *val = 0;
- *val2 = 38245;
+ *val = data->chip_info->accel_scale.integer;
+ *val2 = data->chip_info->accel_scale.decimal;
return IIO_VAL_INT_PLUS_NANO;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_OFFSET:
- *val = -2111;
- *val2 = 250000;
+ *val = data->chip_info->temp_offset.integer;
+ *val2 = data->chip_info->temp_offset.decimal;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_CHAN_INFO_CALIBBIAS:
*val = sign_extend32(data->calibbias[chan->address], 15);
@@ -705,7 +751,7 @@ static int adxl355_probe_trigger(struct iio_dev *indio_dev, int irq)
}

int adxl355_core_probe(struct device *dev, struct regmap *regmap,
- const char *name)
+ const struct adxl355_chip_info *chip_info)
{
struct adxl355_data *data;
struct iio_dev *indio_dev;
@@ -720,9 +766,10 @@ int adxl355_core_probe(struct device *dev, struct regmap *regmap,
data->regmap = regmap;
data->dev = dev;
data->op_mode = ADXL355_STANDBY;
+ data->chip_info = chip_info;
mutex_init(&data->lock);

- indio_dev->name = name;
+ indio_dev->name = chip_info->name;
indio_dev->info = &adxl355_info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = adxl355_channels;
diff --git a/drivers/iio/accel/adxl355_i2c.c b/drivers/iio/accel/adxl355_i2c.c
index f67d57921c81..6cde5ccac06b 100644
--- a/drivers/iio/accel/adxl355_i2c.c
+++ b/drivers/iio/accel/adxl355_i2c.c
@@ -23,6 +23,20 @@ static const struct regmap_config adxl355_i2c_regmap_config = {
static int adxl355_i2c_probe(struct i2c_client *client)
{
struct regmap *regmap;
+ const struct adxl355_chip_info *chip_data;
+ const struct i2c_device_id *adxl355;
+
+ chip_data = device_get_match_data(&client->dev);
+ if (!chip_data) {
+ adxl355 = to_i2c_driver(client->dev.driver)->id_table;
+ if (!adxl355)
+ return -EINVAL;
+
+ chip_data = (void *)i2c_match_id(adxl355, client)->driver_data;
+
+ if (!chip_data)
+ return -EINVAL;
+ }

regmap = devm_regmap_init_i2c(client, &adxl355_i2c_regmap_config);
if (IS_ERR(regmap)) {
@@ -32,17 +46,19 @@ static int adxl355_i2c_probe(struct i2c_client *client)
return PTR_ERR(regmap);
}

- return adxl355_core_probe(&client->dev, regmap, client->name);
+ return adxl355_core_probe(&client->dev, regmap, chip_data);
}

static const struct i2c_device_id adxl355_i2c_id[] = {
- { "adxl355", 0 },
+ { "adxl355", (kernel_ulong_t)&adxl35x_chip_info[ADXL355] },
+ { "adxl359", (kernel_ulong_t)&adxl35x_chip_info[ADXL359] },
{ }
};
MODULE_DEVICE_TABLE(i2c, adxl355_i2c_id);

static const struct of_device_id adxl355_of_match[] = {
- { .compatible = "adi,adxl355" },
+ { .compatible = "adi,adxl355", .data = &adxl35x_chip_info[ADXL355] },
+ { .compatible = "adi,adxl359", .data = &adxl35x_chip_info[ADXL359] },
{ }
};
MODULE_DEVICE_TABLE(of, adxl355_of_match);
diff --git a/drivers/iio/accel/adxl355_spi.c b/drivers/iio/accel/adxl355_spi.c
index 5fe986ae03f6..fc99534d91ff 100644
--- a/drivers/iio/accel/adxl355_spi.c
+++ b/drivers/iio/accel/adxl355_spi.c
@@ -9,6 +9,7 @@
#include <linux/mod_devicetable.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>
+#include <linux/property.h>

#include "adxl355.h"

@@ -24,9 +25,17 @@ static const struct regmap_config adxl355_spi_regmap_config = {

static int adxl355_spi_probe(struct spi_device *spi)
{
- const struct spi_device_id *id = spi_get_device_id(spi);
+ const struct adxl355_chip_info *chip_data;
struct regmap *regmap;

+ chip_data = device_get_match_data(&spi->dev);
+ if (!chip_data) {
+ chip_data = (void *)spi_get_device_id(spi)->driver_data;
+
+ if (!chip_data)
+ return -EINVAL;
+ }
+
regmap = devm_regmap_init_spi(spi, &adxl355_spi_regmap_config);
if (IS_ERR(regmap)) {
dev_err(&spi->dev, "Error initializing spi regmap: %ld\n",
@@ -35,17 +44,19 @@ static int adxl355_spi_probe(struct spi_device *spi)
return PTR_ERR(regmap);
}

- return adxl355_core_probe(&spi->dev, regmap, id->name);
+ return adxl355_core_probe(&spi->dev, regmap, chip_data);
}

static const struct spi_device_id adxl355_spi_id[] = {
- { "adxl355", 0 },
+ { "adxl355", (kernel_ulong_t)&adxl35x_chip_info[ADXL355] },
+ { "adxl359", (kernel_ulong_t)&adxl35x_chip_info[ADXL359] },
{ }
};
MODULE_DEVICE_TABLE(spi, adxl355_spi_id);

static const struct of_device_id adxl355_of_match[] = {
- { .compatible = "adi,adxl355" },
+ { .compatible = "adi,adxl355", .data = &adxl35x_chip_info[ADXL355] },
+ { .compatible = "adi,adxl359", .data = &adxl35x_chip_info[ADXL359] },
{ }
};
MODULE_DEVICE_TABLE(of, adxl355_of_match);
--
2.25.1

Next message: tip-bot2 for Chengming Zhou: "[tip: sched/core] sched/psi: Use task->psi_flags to clear in CPU migration"
Previous message: Ramona Bolboaca: "[PATCH v2 2/3] dt-bindings: iio: accel: Add docs for ADXL359"
In reply to: Ramona Bolboaca: "[PATCH v2 2/3] dt-bindings: iio: accel: Add docs for ADXL359"
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