iio: accel: kxsd9: Add I2C transport

This adds I2C regmap transport for the KXSD9 driver.
Tested on the KXSD9 sensor on the APQ8060 Dragonboard.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
index eebc20d6c827f0503411273b5d8569d9108a2ca4..8824400d49111bb0b24dd4ceb9589102715b9cb3 100644 (file)
--- a/drivers/iio/accel/Kconfig
+++ b/drivers/iio/accel/Kconfig
@@ -121,7 +121,7 @@ config KXSD9
        tristate "Kionix KXSD9 Accelerometer Driver"
        help
          Say yes here to build support for the Kionix KXSD9 accelerometer.
-         Currently this only supports the device via an SPI interface.
+         It can be accessed using an (optional) SPI or I2C interface.
 
          To compile this driver as a module, choose M here: the module
          will be called kxsd9.
@@ -136,6 +136,16 @@ config KXSD9_SPI
          Say yes here to enable the Kionix KXSD9 accelerometer
          SPI transport channel.
 
+config KXSD9_I2C
+       tristate "Kionix KXSD9 I2C transport"
+       depends on KXSD9
+       depends on I2C
+       default KXSD9
+       select REGMAP_I2C
+       help
+         Say yes here to enable the Kionix KXSD9 accelerometer
+         I2C transport channel.
+
 config KXCJK1013
        tristate "Kionix 3-Axis Accelerometer Driver"
        depends on I2C

diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
index 2fe41d7ffb6e0ebb5a14ca0e92d6ccf5669039a7..b5c2a0b5550f0054d680cb4814830dd44ca7e667 100644 (file)
--- a/drivers/iio/accel/Makefile
+++ b/drivers/iio/accel/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_HID_SENSOR_ACCEL_3D) += hid-sensor-accel-3d.o
 obj-$(CONFIG_KXCJK1013) += kxcjk-1013.o
 obj-$(CONFIG_KXSD9)    += kxsd9.o
 obj-$(CONFIG_KXSD9_SPI)        += kxsd9-spi.o
+obj-$(CONFIG_KXSD9_I2C)        += kxsd9-i2c.o
 
 obj-$(CONFIG_MMA7455)          += mma7455_core.o
 obj-$(CONFIG_MMA7455_I2C)      += mma7455_i2c.o

diff --git a/drivers/iio/accel/kxsd9-i2c.c b/drivers/iio/accel/kxsd9-i2c.c
new file mode 100644 (file)
index 0000000..4aaa27d
--- /dev/null
+++ b/drivers/iio/accel/kxsd9-i2c.c
@@ -0,0 +1,63 @@
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/regmap.h>
+
+#include "kxsd9.h"
+
+static int kxsd9_i2c_probe(struct i2c_client *i2c,
+                          const struct i2c_device_id *id)
+{
+       static const struct regmap_config config = {
+               .reg_bits = 8,
+               .val_bits = 8,
+               .max_register = 0x0e,
+       };
+       struct regmap *regmap;
+
+       regmap = devm_regmap_init_i2c(i2c, &config);
+       if (IS_ERR(regmap)) {
+               dev_err(&i2c->dev, "Failed to register i2c regmap %d\n",
+                       (int)PTR_ERR(regmap));
+               return PTR_ERR(regmap);
+       }
+
+       return kxsd9_common_probe(&i2c->dev,
+                                 regmap,
+                                 i2c->name);
+}
+
+static int kxsd9_i2c_remove(struct i2c_client *client)
+{
+       return kxsd9_common_remove(&client->dev);
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id kxsd9_of_match[] = {
+       { .compatible = "kionix,kxsd9", },
+       { },
+};
+MODULE_DEVICE_TABLE(of, kxsd9_of_match);
+#else
+#define kxsd9_of_match NULL
+#endif
+
+static const struct i2c_device_id kxsd9_i2c_id[] = {
+       {"kxsd9", 0},
+       { },
+};
+MODULE_DEVICE_TABLE(i2c, kxsd9_i2c_id);
+
+static struct i2c_driver kxsd9_i2c_driver = {
+       .driver = {
+               .name   = "kxsd9",
+               .of_match_table = of_match_ptr(kxsd9_of_match),
+       },
+       .probe          = kxsd9_i2c_probe,
+       .remove         = kxsd9_i2c_remove,
+       .id_table       = kxsd9_i2c_id,
+};
+module_i2c_driver(kxsd9_i2c_driver);