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>

1 files changed, 43 insertions, 9 deletions

diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 4e31036ee259..4ad97be48043 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/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,