iio: st_accel: Support sensor i2c probe using acpi

Add support to probe st_accel sensors on i2c bus using ACPI. Compatible
strings are not avaialable on ACPI based systems.

Signed-off-by: Shrirang Bagul <shrirang.bagul@canonical.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/accel/st_accel.h b/drivers/iio/accel/st_accel.h
index 7c23168..3ad44ce 100644 (file)
--- a/drivers/iio/accel/st_accel.h
+++ b/drivers/iio/accel/st_accel.h
@@ -14,6 +14,24 @@
 #include <linux/types.h>
 #include <linux/iio/common/st_sensors.h>
 
+enum st_accel_type {
+       LSM303DLH,
+       LSM303DLHC,
+       LIS3DH,
+       LSM330D,
+       LSM330DL,
+       LSM330DLC,
+       LIS331DLH,
+       LSM303DL,
+       LSM303DLM,
+       LSM330,
+       LSM303AGR,
+       LIS2DH12,
+       LIS3L02DQ,
+       LNG2DM,
+       ST_ACCEL_MAX,
+};
+
 #define H3LIS331DL_DRIVER_NAME         "h3lis331dl_accel"
 #define LIS3LV02DL_ACCEL_DEV_NAME      "lis3lv02dl_accel"
 #define LSM303DLHC_ACCEL_DEV_NAME      "lsm303dlhc_accel"

diff --git a/drivers/iio/accel/st_accel_i2c.c b/drivers/iio/accel/st_accel_i2c.c
index c0f8867..2840649 100644 (file)
--- a/drivers/iio/accel/st_accel_i2c.c
+++ b/drivers/iio/accel/st_accel_i2c.c
@@ -11,6 +11,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/slab.h>
+#include <linux/acpi.h>
 #include <linux/i2c.h>
 #include <linux/iio/iio.h>
 
@@ -95,25 +96,67 @@ MODULE_DEVICE_TABLE(of, st_accel_of_match);
 #define st_accel_of_match NULL
 #endif
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id st_accel_acpi_match[] = {
+       {"SMO8A90", LNG2DM},
+       { },
+};
+MODULE_DEVICE_TABLE(acpi, st_accel_acpi_match);
+#else
+#define st_accel_acpi_match NULL
+#endif
+
+static const struct i2c_device_id st_accel_id_table[] = {
+       { LSM303DLH_ACCEL_DEV_NAME, LSM303DLH },
+       { LSM303DLHC_ACCEL_DEV_NAME, LSM303DLHC },
+       { LIS3DH_ACCEL_DEV_NAME, LIS3DH },
+       { LSM330D_ACCEL_DEV_NAME, LSM330D },
+       { LSM330DL_ACCEL_DEV_NAME, LSM330DL },
+       { LSM330DLC_ACCEL_DEV_NAME, LSM330DLC },
+       { LIS331DLH_ACCEL_DEV_NAME, LIS331DLH },
+       { LSM303DL_ACCEL_DEV_NAME, LSM303DL },
+       { LSM303DLM_ACCEL_DEV_NAME, LSM303DLM },
+       { LSM330_ACCEL_DEV_NAME, LSM330 },
+       { LSM303AGR_ACCEL_DEV_NAME, LSM303AGR },
+       { LIS2DH12_ACCEL_DEV_NAME, LIS2DH12 },
+       { LIS3L02DQ_ACCEL_DEV_NAME, LIS3L02DQ },
+       { LNG2DM_ACCEL_DEV_NAME, LNG2DM },
+       {},
+};
+MODULE_DEVICE_TABLE(i2c, st_accel_id_table);
+
 static int st_accel_i2c_probe(struct i2c_client *client,
                                                const struct i2c_device_id *id)
 {
        struct iio_dev *indio_dev;
        struct st_sensor_data *adata;
-       int err;
+       int ret;
 
        indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*adata));
        if (!indio_dev)
                return -ENOMEM;
 
        adata = iio_priv(indio_dev);
-       st_sensors_of_i2c_probe(client, st_accel_of_match);
+
+       if (client->dev.of_node) {
+               st_sensors_of_i2c_probe(client, st_accel_of_match);
+       } else if (ACPI_HANDLE(&client->dev)) {
+               ret = st_sensors_match_acpi_device(&client->dev);
+               if ((ret < 0) || (ret >= ST_ACCEL_MAX))
+                       return -ENODEV;
+
+               strncpy(client->name, st_accel_id_table[ret].name,
+                               sizeof(client->name));
+               client->name[sizeof(client->name) - 1] = '\0';
+       } else if (!id)
+               return -ENODEV;
+
 
        st_sensors_i2c_configure(indio_dev, client, adata);
 
-       err = st_accel_common_probe(indio_dev);
-       if (err < 0)
-               return err;
+       ret = st_accel_common_probe(indio_dev);
+       if (ret < 0)
+               return ret;
 
        return 0;
 }
@@ -125,29 +168,11 @@ static int st_accel_i2c_remove(struct i2c_client *client)
        return 0;
 }
 
-static const struct i2c_device_id st_accel_id_table[] = {
-       { LSM303DLH_ACCEL_DEV_NAME },
-       { LSM303DLHC_ACCEL_DEV_NAME },
-       { LIS3DH_ACCEL_DEV_NAME },
-       { LSM330D_ACCEL_DEV_NAME },
-       { LSM330DL_ACCEL_DEV_NAME },
-       { LSM330DLC_ACCEL_DEV_NAME },
-       { LIS331DLH_ACCEL_DEV_NAME },
-       { LSM303DL_ACCEL_DEV_NAME },
-       { LSM303DLM_ACCEL_DEV_NAME },
-       { LSM330_ACCEL_DEV_NAME },
-       { LSM303AGR_ACCEL_DEV_NAME },
-       { LIS2DH12_ACCEL_DEV_NAME },
-       { LIS3L02DQ_ACCEL_DEV_NAME },
-       { LNG2DM_ACCEL_DEV_NAME },
-       {},
-};
-MODULE_DEVICE_TABLE(i2c, st_accel_id_table);
-
 static struct i2c_driver st_accel_driver = {
        .driver = {
                .name = "st-accel-i2c",
                .of_match_table = of_match_ptr(st_accel_of_match),
+               .acpi_match_table = ACPI_PTR(st_accel_acpi_match),
        },
        .probe = st_accel_i2c_probe,
        .remove = st_accel_i2c_remove,