iio: accel: bmc150: Move check for second ACPI device into a separate function

Move the check for a second ACPI device for BOSC0200 ACPI fwnodes into
a new bmc150_acpi_dual_accel_probe() helper function.

This is a preparation patch for adding support for a new "DUAL250E" ACPI
Hardware-ID (HID) used on some devices.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20210523170103.176958-4-hdegoede@redhat.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/accel/bmc150-accel-i2c.c

@@ -21,6 +21,52 @@
 
 #include "bmc150-accel.h"
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id bmc150_acpi_dual_accel_ids[] = {
+	{"BOSC0200"},
+	{ }
+};
+
+/*
+ * Some acpi_devices describe 2 accelerometers in a single ACPI device,
+ * try instantiating a second i2c_client for an I2cSerialBusV2 ACPI resource
+ * with index 1.
+ */
+static void bmc150_acpi_dual_accel_probe(struct i2c_client *client)
+{
+	struct acpi_device *adev = ACPI_COMPANION(&client->dev);
+	struct i2c_client *second_dev;
+	struct i2c_board_info board_info = {
+		.type = "bmc150_accel",
+		/*
+		 * The 2nd accel sits in the base of 2-in-1s. Note this name is
+		 * static, as there should never be more then 1 BOSC0200 ACPI
+		 * node with 2 accelerometers in it.
+		 */
+		.dev_name = "BOSC0200:base",
+		.fwnode = client->dev.fwnode,
+		.irq = -ENOENT,
+	};
+
+	if (acpi_match_device_ids(adev, bmc150_acpi_dual_accel_ids))
+		return;
+
+	second_dev = i2c_acpi_new_device(&client->dev, 1, &board_info);
+	if (!IS_ERR(second_dev))
+		bmc150_set_second_device(client, second_dev);
+}
+
+static void bmc150_acpi_dual_accel_remove(struct i2c_client *client)
+{
+	struct i2c_client *second_dev = bmc150_get_second_device(client);
+
+	i2c_unregister_device(second_dev);
+}
+#else
+static void bmc150_acpi_dual_accel_probe(struct i2c_client *client) {}
+static void bmc150_acpi_dual_accel_remove(struct i2c_client *client) {}
+#endif
+
 static int bmc150_accel_probe(struct i2c_client *client,
 			      const struct i2c_device_id *id)
 {
@@ -30,7 +76,6 @@ static int bmc150_accel_probe(struct i2c_client *client,
 		i2c_check_functionality(client->adapter, I2C_FUNC_I2C) ||
 		i2c_check_functionality(client->adapter,
 					I2C_FUNC_SMBUS_READ_I2C_BLOCK);
-	struct acpi_device __maybe_unused *adev;
 	int ret;
 
 	regmap = devm_regmap_init_i2c(client, &bmc150_regmap_conf);
@@ -47,41 +92,18 @@ static int bmc150_accel_probe(struct i2c_client *client,
 		return ret;
 
 	/*
-	 * Some BOSC0200 acpi_devices describe 2 accelerometers in a single ACPI
-	 * device, try instantiating a second i2c_client for an I2cSerialBusV2
-	 * ACPI resource with index 1. The !id check avoids recursion when
-	 * bmc150_accel_probe() gets called for the second client.
+	 * The !id check avoids recursion when probe() gets called
+	 * for the second client.
 	 */
-#ifdef CONFIG_ACPI
-	adev = ACPI_COMPANION(&client->dev);
-	if (!id && adev && strcmp(acpi_device_hid(adev), "BOSC0200") == 0) {
-		struct i2c_board_info board_info = {
-			.type = "bmc150_accel",
-			/*
-			 * The 2nd accel sits in the base of 2-in-1s. Note this
-			 * name is static, as there should never be more then 1
-			 * BOSC0200 ACPI node with 2 accelerometers in it.
-			 */
-			.dev_name = "BOSC0200:base",
-			.fwnode = client->dev.fwnode,
-			.irq = -ENOENT,
-		};
-		struct i2c_client *second_dev;
-
-		second_dev = i2c_acpi_new_device(&client->dev, 1, &board_info);
-		if (!IS_ERR(second_dev))
-			bmc150_set_second_device(client, second_dev);
-	}
-#endif
+	if (!id && has_acpi_companion(&client->dev))
+		bmc150_acpi_dual_accel_probe(client);
 
 	return 0;
 }
 
 static int bmc150_accel_remove(struct i2c_client *client)
 {
-	struct i2c_client *second_dev = bmc150_get_second_device(client);
-
-	i2c_unregister_device(second_dev);
+	bmc150_acpi_dual_accel_remove(client);
 
 	return bmc150_accel_core_remove(&client->dev);
 }