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>

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.

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},
 	{}
 };