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>

1 files changed, 27 insertions, 12 deletions

diff --git a/drivers/iio/gyro/bmg160.c b/drivers/iio/gyro/bmg160.c
index 99acf361aa53..1f967e0d688e 100644
--- 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},
         {}
 };