V4L/DVB (13601): radio-si470x: support PM functions

This patch is to support PM of the si470x i2c driver.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Acked-by: Tobias Lorenz <tobias.lorenz@gmx.net>
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/drivers/media/radio/si470x/radio-si470x-i2c.c b/drivers/media/radio/si470x/radio-si470x-i2c.c
index b8c0d5cda2f6..5466015346a1 100644
--- a/drivers/media/radio/si470x/radio-si470x-i2c.c
+++ b/drivers/media/radio/si470x/radio-si470x-i2c.c
@@ -487,6 +487,44 @@ static __devexit int si470x_i2c_remove(struct i2c_client *client)
 }
 
 
+#ifdef CONFIG_PM
+/*
+ * si470x_i2c_suspend - suspend the device
+ */
+static int si470x_i2c_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+        struct si470x_device *radio = i2c_get_clientdata(client);
+
+        /* power down */
+        radio->registers[POWERCFG] |= POWERCFG_DISABLE;
+        if (si470x_set_register(radio, POWERCFG) < 0)
+                return -EIO;
+
+        return 0;
+}
+
+
+/*
+ * si470x_i2c_resume - resume the device
+ */
+static int si470x_i2c_resume(struct i2c_client *client)
+{
+        struct si470x_device *radio = i2c_get_clientdata(client);
+
+        /* power up : need 110ms */
+        radio->registers[POWERCFG] |= POWERCFG_ENABLE;
+        if (si470x_set_register(radio, POWERCFG) < 0)
+                return -EIO;
+        msleep(110);
+
+        return 0;
+}
+#else
+#define si470x_i2c_suspend      NULL
+#define si470x_i2c_resume       NULL
+#endif
+
+
 /*
  * si470x_i2c_driver - i2c driver interface
  */
@@ -497,6 +535,8 @@ static struct i2c_driver si470x_i2c_driver = {
         },
         .probe                  = si470x_i2c_probe,
         .remove                 = __devexit_p(si470x_i2c_remove),
+        .suspend                = si470x_i2c_suspend,
+        .resume                 = si470x_i2c_resume,
         .id_table               = si470x_i2c_id,
 };