iio: gyro: bmi055 gyro sensor driver

Add support for the BMI055 gyroscope sensor. BMI055 is a package
consisting of an acceleration sensor and a gyroscope. This patch
adds support for the gyroscope only.

Spec downloaded from:
http://ae-bst.resource.bosch.com/media/products/dokumente/bmi055/BST-BMI055-DS000-06.pdf

The BMI055 gyroscope uses the same register definition as BMG160,
but does not specify a temp register. However, the temp register
seems to be working in the same way as for BMG160, so this patch
does not remove the temp channel for BMI055.

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Reviewed-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/gyro/Kconfig b/drivers/iio/gyro/Kconfig
index d630ae987d0ba9619766227d620788f096bf42fc..b3d0e94f72eb740640e9999d749fce3bc701fc68 100644 (file)
--- a/drivers/iio/gyro/Kconfig
+++ b/drivers/iio/gyro/Kconfig
@@ -56,7 +56,7 @@ config BMG160
        select IIO_TRIGGERED_BUFFER if IIO_BUFFER
        help
          Say yes here to build support for Bosch BMG160 Tri-axis Gyro Sensor
-         driver.
+         driver. This driver also supports BMI055 gyroscope.
 
          This driver can also be built as a module.  If so, the module
          will be called bmg160.

diff --git a/drivers/iio/gyro/bmg160.c b/drivers/iio/gyro/bmg160.c
index 99acf361aa530b00081eced4d9e9f8a7f8dccea4..1f967e0d688e47a084f29e2b484621016ada7c3c 100644 (file)
--- a/drivers/iio/gyro/bmg160.c
+++ b/drivers/iio/gyro/bmg160.c
@@ -949,10 +949,10 @@ static irqreturn_t bmg160_data_rdy_trig_poll(int irq, void *private)
 
 }
 
-static int bmg160_acpi_gpio_probe(struct i2c_client *client,
-                                 struct bmg160_data *data)
+static int bmg160_gpio_probe(struct i2c_client *client,
+                            struct bmg160_data *data)
+
 {
-       const struct acpi_device_id *id;
        struct device *dev;
        struct gpio_desc *gpio;
        int ret;
@@ -961,12 +961,6 @@ static int bmg160_acpi_gpio_probe(struct i2c_client *client,
                return -EINVAL;
 
        dev = &client->dev;
-       if (!ACPI_HANDLE(dev))
-               return -ENODEV;
-
-       id = acpi_match_device(dev->driver->acpi_match_table, dev);
-       if (!id)
-               return -ENODEV;
 
        /* data ready gpio interrupt pin */
        gpio = devm_gpiod_get_index(dev, BMG160_GPIO_NAME, 0);
@@ -986,12 +980,24 @@ static int bmg160_acpi_gpio_probe(struct i2c_client *client,
        return ret;
 }
 
+static const char *bmg160_match_acpi_device(struct device *dev)
+{
+       const struct acpi_device_id *id;
+
+       id = acpi_match_device(dev->driver->acpi_match_table, dev);
+       if (!id)
+               return NULL;
+
+       return dev_name(dev);
+}
+
 static int bmg160_probe(struct i2c_client *client,
                        const struct i2c_device_id *id)
 {
        struct bmg160_data *data;
        struct iio_dev *indio_dev;
        int ret;
+       const char *name = NULL;
 
        indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
        if (!indio_dev)
@@ -1007,15 +1013,21 @@ static int bmg160_probe(struct i2c_client *client,
 
        mutex_init(&data->mutex);
 
+       if (id)
+               name = id->name;
+
+       if (ACPI_HANDLE(&client->dev))
+               name = bmg160_match_acpi_device(&client->dev);
+
        indio_dev->dev.parent = &client->dev;
        indio_dev->channels = bmg160_channels;
        indio_dev->num_channels = ARRAY_SIZE(bmg160_channels);
-       indio_dev->name = BMG160_DRV_NAME;
+       indio_dev->name = name;
        indio_dev->modes = INDIO_DIRECT_MODE;
        indio_dev->info = &bmg160_info;
 
        if (client->irq <= 0)
-               client->irq = bmg160_acpi_gpio_probe(client, data);
+               client->irq = bmg160_gpio_probe(client, data);
 
        if (client->irq > 0) {
                ret = devm_request_threaded_irq(&client->dev,
@@ -1185,12 +1197,15 @@ static const struct dev_pm_ops bmg160_pm_ops = {
 
 static const struct acpi_device_id bmg160_acpi_match[] = {
        {"BMG0160", 0},
-       { },
+       {"BMI055B", 0},
+       {},
 };
+
 MODULE_DEVICE_TABLE(acpi, bmg160_acpi_match);
 
 static const struct i2c_device_id bmg160_id[] = {
        {"bmg160", 0},
+       {"bmi055_gyro", 0},
        {}
 };