iio: kx022a: Support ROHM KX132ACR-LBZ

dt-bindings: iio: Add KX132ACR-LBZ accelerometer

ROHM KX132ACR-LBZ is an accelerometer for industrial applications. It
has a subset of KX022A functionalities, dropping support for tap, free
fall and tilt detection engines. Also, the register interface is an exact
subset of what is found on KX022A (except the WHO_AM_I register value).

Add support for KX132ACR-LBZ.
Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Link: https://lore.kernel.org/r/272065b9f35b817aff86b7760ff1aaaaaaa969f5.1695879676.git.mazziesaccount@gmail.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/accel/Kconfig

@@ -420,7 +420,7 @@ config IIO_KX022A_SPI
 	help
 	  Enable support for the Kionix digital tri-axis accelerometers
 	  connected to SPI interface. Supported devices are:
-	    KX022A, KX132-1211
+	    KX022A, KX132-1211, KX132ACR-LBZ
 
 config IIO_KX022A_I2C
 	tristate "Kionix KX022A tri-axis digital accelerometer I2C interface"
@@ -430,7 +430,7 @@ config IIO_KX022A_I2C
 	help
 	  Enable support for the Kionix digital tri-axis accelerometers
 	  connected to I2C interface. Supported devices are:
-	    KX022A, KX132-1211
+	    KX022A, KX132-1211, KX132ACR-LBZ
 
 config KXSD9
 	tristate "Kionix KXSD9 Accelerometer Driver"

drivers/iio/accel/kionix-kx022a-i2c.c

@@ -2,7 +2,7 @@
 /*
  * Copyright (C) 2022 ROHM Semiconductors
  *
- * ROHM/KIONIX KX022A accelerometer driver
+ * ROHM/KIONIX accelerometer driver
  */
 
 #include <linux/i2c.h>
@@ -38,6 +38,7 @@ static int kx022a_i2c_probe(struct i2c_client *i2c)
 static const struct i2c_device_id kx022a_i2c_id[] = {
 	{ .name = "kx022a", .driver_data = (kernel_ulong_t)&kx022a_chip_info },
 	{ .name = "kx132-1211", .driver_data = (kernel_ulong_t)&kx132_chip_info },
+	{ .name = "kx132acr-lbz", .driver_data = (kernel_ulong_t)&kx132acr_chip_info },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, kx022a_i2c_id);
@@ -45,6 +46,7 @@ MODULE_DEVICE_TABLE(i2c, kx022a_i2c_id);
 static const struct of_device_id kx022a_of_match[] = {
 	{ .compatible = "kionix,kx022a", .data = &kx022a_chip_info },
 	{ .compatible = "kionix,kx132-1211", .data = &kx132_chip_info },
+	{ .compatible = "rohm,kx132acr-lbz", .data = &kx132acr_chip_info },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, kx022a_of_match);

drivers/iio/accel/kionix-kx022a-spi.c

@@ -2,7 +2,7 @@
 /*
  * Copyright (C) 2022 ROHM Semiconductors
  *
- * ROHM/KIONIX KX022A accelerometer driver
+ * ROHM/KIONIX accelerometer driver
  */
 
 #include <linux/interrupt.h>
@@ -38,6 +38,7 @@ static int kx022a_spi_probe(struct spi_device *spi)
 static const struct spi_device_id kx022a_id[] = {
 	{ .name = "kx022a", .driver_data = (kernel_ulong_t)&kx022a_chip_info },
 	{ .name = "kx132-1211", .driver_data = (kernel_ulong_t)&kx132_chip_info },
+	{ .name = "kx132acr-lbz", .driver_data = (kernel_ulong_t)&kx132acr_chip_info },
 	{ }
 };
 MODULE_DEVICE_TABLE(spi, kx022a_id);
@@ -45,6 +46,7 @@ MODULE_DEVICE_TABLE(spi, kx022a_id);
 static const struct of_device_id kx022a_of_match[] = {
 	{ .compatible = "kionix,kx022a", .data = &kx022a_chip_info },
 	{ .compatible = "kionix,kx132-1211", .data = &kx132_chip_info },
+	{ .compatible = "rohm,kx132acr-lbz", .data = &kx132acr_chip_info },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, kx022a_of_match);

drivers/iio/accel/kionix-kx022a.c

@@ -2,7 +2,7 @@
 /*
  * Copyright (C) 2022 ROHM Semiconductors
  *
- * ROHM/KIONIX KX022A accelerometer driver
+ * ROHM/KIONIX accelerometer driver
  */
 
 #include <linux/delay.h>
@@ -1188,6 +1188,38 @@ const struct kx022a_chip_info kx132_chip_info = {
 };
 EXPORT_SYMBOL_NS_GPL(kx132_chip_info, IIO_KX022A);
 
+/*
+ * Despite the naming, KX132ACR-LBZ is not similar to KX132-1211 but it is
+ * exact subset of KX022A. KX132ACR-LBZ is meant to be used for industrial
+ * applications and the tap/double tap, free fall and tilt engines were
+ * removed. Rest of the registers and functionalities (excluding the ID
+ * register) are exact match to what is found in KX022.
+ */
+const struct kx022a_chip_info kx132acr_chip_info = {
+	.name				= "kx132acr-lbz",
+	.regmap_config			= &kx022a_regmap_config,
+	.channels			= kx022a_channels,
+	.num_channels			= ARRAY_SIZE(kx022a_channels),
+	.fifo_length			= KX022A_FIFO_LENGTH,
+	.who				= KX022A_REG_WHO,
+	.id				= KX132ACR_LBZ_ID,
+	.cntl				= KX022A_REG_CNTL,
+	.cntl2				= KX022A_REG_CNTL2,
+	.odcntl				= KX022A_REG_ODCNTL,
+	.buf_cntl1			= KX022A_REG_BUF_CNTL1,
+	.buf_cntl2			= KX022A_REG_BUF_CNTL2,
+	.buf_clear			= KX022A_REG_BUF_CLEAR,
+	.buf_status1			= KX022A_REG_BUF_STATUS_1,
+	.buf_read			= KX022A_REG_BUF_READ,
+	.inc1				= KX022A_REG_INC1,
+	.inc4				= KX022A_REG_INC4,
+	.inc5				= KX022A_REG_INC5,
+	.inc6				= KX022A_REG_INC6,
+	.xout_l				= KX022A_REG_XOUT_L,
+	.get_fifo_bytes_available	= kx022a_get_fifo_bytes_available,
+};
+EXPORT_SYMBOL_NS_GPL(kx132acr_chip_info, IIO_KX022A);
+
 int kx022a_probe_internal(struct device *dev, const struct kx022a_chip_info *chip_info)
 {
 	static const char * const regulator_names[] = {"io-vdd", "vdd"};

drivers/iio/accel/kionix-kx022a.h

@@ -13,6 +13,7 @@
 
 #define KX022A_REG_WHO		0x0f
 #define KX022A_ID		0xc8
+#define KX132ACR_LBZ_ID		0xd8
 
 #define KX022A_REG_CNTL2	0x19
 #define KX022A_MASK_SRST	BIT(7)
@@ -186,5 +187,6 @@ int kx022a_probe_internal(struct device *dev, const struct kx022a_chip_info *chi
 
 extern const struct kx022a_chip_info kx022a_chip_info;
 extern const struct kx022a_chip_info kx132_chip_info;
+extern const struct kx022a_chip_info kx132acr_chip_info;
 
 #endif