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From:   Ramona Bolboaca <ramona.bolboaca@analog.com>
To:     <jic23@kernel.org>, <robh+dt@kernel.org>,
        <krzysztof.kozlowski+dt@linaro.org>, <linux-iio@vger.kernel.org>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>
CC:     Ramona Bolboaca <ramona.bolboaca@analog.com>
Subject: [PATCH 2/2] drivers:iio:accel: Add support for ADXL359 device
Date:   Fri, 28 Oct 2022 16:44:54 +0300
Message-ID: <20221028134454.669509-3-ramona.bolboaca@analog.com>
In-Reply-To: <20221028134454.669509-1-ramona.bolboaca@analog.com>
References: <20221028134454.669509-1-ramona.bolboaca@analog.com>
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Add support for ADXL359 device in already existing ADXL355 driver.

Signed-off-by: Ramona Bolboaca <ramona.bolboaca@analog.com>
---
 drivers/iio/accel/adxl355.h      | 14 ++++++-
 drivers/iio/accel/adxl355_core.c | 67 +++++++++++++++++++++++++-------
 drivers/iio/accel/adxl355_i2c.c  | 22 +++++++++--
 drivers/iio/accel/adxl355_spi.c  | 19 +++++++--
 4 files changed, 101 insertions(+), 21 deletions(-)

diff --git a/drivers/iio/accel/adxl355.h b/drivers/iio/accel/adxl355.h
index 6dd49b13e4fd..c02106cbd745 100644
--- a/drivers/iio/accel/adxl355.h
+++ b/drivers/iio/accel/adxl355.h
@@ -10,12 +10,24 @@
 
 #include <linux/regmap.h>
 
+enum adxl355_device_type {
+	ADXL355,
+	ADXL359,
+};
+
 struct device;
 
+struct adxl355_chip_info {
+	const char			*name;
+	u8				part_id;
+	enum adxl355_device_type	type;
+};
+
 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 4bc648eac8b2..069c945aebde 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 +84,20 @@ 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,
+		.type = ADXL355,
+	},
+	[ADXL359] = {
+		.name = "adxl359",
+		.part_id = ADXL359_PARTID_VAL,
+		.type = ADXL359,
+	},
+};
+EXPORT_SYMBOL_NS_GPL(adxl35x_chip_info, IIO_ADXL355);
+
 enum adxl355_op_mode {
 	ADXL355_MEASUREMENT,
 	ADXL355_STANDBY,
@@ -162,6 +177,7 @@ 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 */
@@ -262,7 +278,7 @@ static int adxl355_setup(struct adxl355_data *data)
 	if (ret)
 		return ret;
 
-	if (regval != ADXL355_PARTID_VAL) {
+	if (regval != data->chip_info->part_id) {
 		dev_err(data->dev, "Invalid DEV ID 0x%02x\n", regval);
 		return -ENODEV;
 	}
@@ -459,31 +475,55 @@ 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
+		 * The datasheet defines an intercept of 1885 LSB for ADXL355 and of 1852 for ADXL359
+		 * 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
+		 * Temp = ((RAW - 1885)/(-9.05)) + 25 for ADXL355
+		 * Temp = ((RAW - 1852)/(-9.05)) + 25 for ADXL359
+		 * 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.
+		 * and offset as -2111.25 for ADXL355 and -2079.25 for ADXL359
 		 */
 		case IIO_TEMP:
 			*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:
+			switch (data->chip_info->type) {
+			case ADXL355:
+				/*
+				 * At +/- 2g with 20-bit resolution, scale is given in datasheet
+				 * as 3.9ug/LSB = 0.0000039 * 9.80665 = 0.00003824593 m/s^2.
+				 */
+				*val2 = 38245;
+				break;
+			case ADXL359:
+				/*
+				 * 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.
+				 */
+				*val2 = 191229;
+				break;
+			default:
+				return -EINVAL;
+			}
 			*val = 0;
-			*val2 = 38245;
 			return IIO_VAL_INT_PLUS_NANO;
 		default:
 			return -EINVAL;
 		}
 	case IIO_CHAN_INFO_OFFSET:
-		*val = -2111;
+		switch (data->chip_info->type) {
+		case ADXL355:
+			*val = -2111;
+			break;
+		case ADXL359:
+			*val = -2079;
+			break;
+		default:
+			return -EINVAL;
+		}
 		*val2 = 250000;
 		return IIO_VAL_INT_PLUS_MICRO;
 	case IIO_CHAN_INFO_CALIBBIAS:
@@ -707,7 +747,7 @@ 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;
@@ -722,9 +762,10 @@ 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..4cf38625fc27 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;
+
+	adxl355 = to_i2c_driver(client->dev.driver)->id_table;
+	if (!adxl355)
+		return -EINVAL;
+
+	chip_data = device_get_match_data(&client->dev);
+	if (!chip_data) {
+		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