rtc: ds1307: Add ACPI support

This patch enables ACPI support for rtc-ds1307 driver.
Signed-off-by: Tin Huynh <tnhuynh@apm.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

drivers/rtc/rtc-ds1307.c

@@ -11,6 +11,7 @@
  * published by the Free Software Foundation.
  */
 
+#include <linux/acpi.h>
 #include <linux/bcd.h>
 #include <linux/i2c.h>
 #include <linux/init.h>
@@ -191,6 +192,26 @@ static const struct i2c_device_id ds1307_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, ds1307_id);
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id ds1307_acpi_ids[] = {
+	{ .id = "DS1307", .driver_data = ds_1307 },
+	{ .id = "DS1337", .driver_data = ds_1337 },
+	{ .id = "DS1338", .driver_data = ds_1338 },
+	{ .id = "DS1339", .driver_data = ds_1339 },
+	{ .id = "DS1388", .driver_data = ds_1388 },
+	{ .id = "DS1340", .driver_data = ds_1340 },
+	{ .id = "DS3231", .driver_data = ds_3231 },
+	{ .id = "M41T00", .driver_data = m41t00 },
+	{ .id = "MCP7940X", .driver_data = mcp794xx },
+	{ .id = "MCP7941X", .driver_data = mcp794xx },
+	{ .id = "PT7C4338", .driver_data = ds_1307 },
+	{ .id = "RX8025", .driver_data = rx_8025 },
+	{ .id = "ISL12057", .driver_data = ds_1337 },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, ds1307_acpi_ids);
+#endif
+
 /*----------------------------------------------------------------------*/
 
 #define BLOCK_DATA_MAX_TRIES 10
@@ -874,17 +895,17 @@ static u8 do_trickle_setup_ds1339(struct i2c_client *client,
 	return setup;
 }
 
-static void ds1307_trickle_of_init(struct i2c_client *client,
-				   struct chip_desc *chip)
+static void ds1307_trickle_init(struct i2c_client *client,
+				struct chip_desc *chip)
 {
 	uint32_t ohms = 0;
 	bool diode = true;
 
 	if (!chip->do_trickle_setup)
 		goto out;
-	if (of_property_read_u32(client->dev.of_node, "trickle-resistor-ohms" , &ohms))
+	if (device_property_read_u32(&client->dev, "trickle-resistor-ohms", &ohms))
 		goto out;
-	if (of_property_read_bool(client->dev.of_node, "trickle-diode-disable"))
+	if (device_property_read_bool(&client->dev, "trickle-diode-disable"))
 		diode = false;
 	chip->trickle_charger_setup = chip->do_trickle_setup(client,
 							     ohms, diode);
@@ -1268,7 +1289,7 @@ static int ds1307_probe(struct i2c_client *client,
 	struct ds1307		*ds1307;
 	int			err = -ENODEV;
 	int			tmp, wday;
-	struct chip_desc	*chip = &chips[id->driver_data];
+	struct chip_desc	*chip;
 	struct i2c_adapter	*adapter = to_i2c_adapter(client->dev.parent);
 	bool			want_irq = false;
 	bool			ds1307_can_wakeup_device = false;
@@ -1297,11 +1318,23 @@ static int ds1307_probe(struct i2c_client *client,
 	i2c_set_clientdata(client, ds1307);
 
 	ds1307->client	= client;
-	ds1307->type	= id->driver_data;
+	if (id) {
+		chip = &chips[id->driver_data];
+		ds1307->type = id->driver_data;
+	} else {
+		const struct acpi_device_id *acpi_id;
+
+		acpi_id = acpi_match_device(ACPI_PTR(ds1307_acpi_ids),
+					    &client->dev);
+		if (!acpi_id)
+			return -ENODEV;
+		chip = &chips[acpi_id->driver_data];
+		ds1307->type = acpi_id->driver_data;
+	}
 
-	if (!pdata && client->dev.of_node)
-		ds1307_trickle_of_init(client, chip);
-	else if (pdata && pdata->trickle_charger_setup)
+	if (!pdata)
+		ds1307_trickle_init(client, chip);
+	else if (pdata->trickle_charger_setup)
 		chip->trickle_charger_setup = pdata->trickle_charger_setup;
 
 	if (chip->trickle_charger_setup && chip->trickle_charger_reg) {
@@ -1678,6 +1711,7 @@ static int ds1307_remove(struct i2c_client *client)
 static struct i2c_driver ds1307_driver = {
 	.driver = {
 		.name	= "rtc-ds1307",
+		.acpi_match_table = ACPI_PTR(ds1307_acpi_ids),
 	},
 	.probe		= ds1307_probe,
 	.remove		= ds1307_remove,