iio: accel: bma180: Add ACPI enumeration support for BMA250E

Some x86 tablets use the BMA250E accelerometer, add support for this.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/accel/bma180.c

@@ -14,6 +14,7 @@
  * BMA250: 7-bit I2C slave address 0x18 or 0x19
  */
 
+#include <linux/acpi.h>
 #include <linux/module.h>
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
@@ -727,6 +728,8 @@ static const struct iio_trigger_ops bma180_trigger_ops = {
 static int bma180_probe(struct i2c_client *client,
 		const struct i2c_device_id *id)
 {
+	struct device *dev = &client->dev;
+	const struct acpi_device_id *acpi_id;
 	struct bma180_data *data;
 	struct iio_dev *indio_dev;
 	enum chip_ids chip;
@@ -739,10 +742,17 @@ static int bma180_probe(struct i2c_client *client,
 	data = iio_priv(indio_dev);
 	i2c_set_clientdata(client, indio_dev);
 	data->client = client;
-	if (client->dev.of_node)
+	if (dev->of_node) {
 		chip = (enum chip_ids)of_device_get_match_data(&client->dev);
-	else
+	} else if (id) {
 		chip = id->driver_data;
+	} else {
+		acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
+		if (!acpi_id)
+			return -ENODEV;
+
+		chip = acpi_id->driver_data;
+	}
 	data->part_info = &bma180_part_info[chip];
 
 	ret = data->part_info->chip_config(data);
@@ -863,6 +873,12 @@ static SIMPLE_DEV_PM_OPS(bma180_pm_ops, bma180_suspend, bma180_resume);
 #define BMA180_PM_OPS NULL
 #endif
 
+static const struct acpi_device_id bma180_acpi_match[] = {
+	{ "BMA250E", BMA250E },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, bma180_acpi_match);
+
 static struct i2c_device_id bma180_ids[] = {
 	{ "bma180", BMA180 },
 	{ "bma250", BMA250 },
@@ -888,6 +904,7 @@ MODULE_DEVICE_TABLE(of, bma180_of_match);
 static struct i2c_driver bma180_driver = {
 	.driver = {
 		.name	= "bma180",
+		.acpi_match_table = ACPI_PTR(bma180_acpi_match),
 		.pm	= BMA180_PM_OPS,
 		.of_match_table = bma180_of_match,
 	},