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authorLars-Peter Clausen <lars@metafoo.de>2014-03-10 14:05:39 -0300
committerMauro Carvalho Chehab <m.chehab@samsung.com>2014-03-11 10:26:38 -0300
commite246c3332daa885e911630922ee08c7956dfea0e (patch)
tree6cfbe9e8ff3bc4e1eb966320404a01acf305d61f /drivers/media/i2c
parentfa5b7945aefdbcd4419f0b8872ce67866d8071e3 (diff)
[media] adv7180: Add support for power down
The adv7180 has a low power mode in which the analog and the digital processing section are shut down. Implement the s_power callback to let bridge drivers put the part into low power mode when not needed. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'drivers/media/i2c')
-rw-r--r--drivers/media/i2c/adv7180.c52
1 files changed, 42 insertions, 10 deletions
diff --git a/drivers/media/i2c/adv7180.c b/drivers/media/i2c/adv7180.c
index 623cec5c5eb9..9cfc9a3ab3cc 100644
--- a/drivers/media/i2c/adv7180.c
+++ b/drivers/media/i2c/adv7180.c
@@ -127,6 +127,7 @@ struct adv7180_state {
int irq;
v4l2_std_id curr_norm;
bool autodetect;
+ bool powered;
u8 input;
};
#define to_adv7180_sd(_ctrl) (&container_of(_ctrl->handler, \
@@ -311,6 +312,37 @@ out:
return ret;
}
+static int adv7180_set_power(struct adv7180_state *state,
+ struct i2c_client *client, bool on)
+{
+ u8 val;
+
+ if (on)
+ val = ADV7180_PWR_MAN_ON;
+ else
+ val = ADV7180_PWR_MAN_OFF;
+
+ return i2c_smbus_write_byte_data(client, ADV7180_PWR_MAN_REG, val);
+}
+
+static int adv7180_s_power(struct v4l2_subdev *sd, int on)
+{
+ struct adv7180_state *state = to_state(sd);
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+ int ret;
+
+ ret = mutex_lock_interruptible(&state->mutex);
+ if (ret)
+ return ret;
+
+ ret = adv7180_set_power(state, client, on);
+ if (ret == 0)
+ state->powered = on;
+
+ mutex_unlock(&state->mutex);
+ return ret;
+}
+
static int adv7180_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct v4l2_subdev *sd = to_adv7180_sd(ctrl);
@@ -441,6 +473,7 @@ static const struct v4l2_subdev_video_ops adv7180_video_ops = {
static const struct v4l2_subdev_core_ops adv7180_core_ops = {
.s_std = adv7180_s_std,
+ .s_power = adv7180_s_power,
};
static const struct v4l2_subdev_ops adv7180_ops = {
@@ -587,6 +620,7 @@ static int adv7180_probe(struct i2c_client *client,
state->irq = client->irq;
mutex_init(&state->mutex);
state->autodetect = true;
+ state->powered = true;
state->input = 0;
sd = &state->sd;
v4l2_i2c_subdev_init(sd, client, &adv7180_ops);
@@ -640,13 +674,10 @@ static const struct i2c_device_id adv7180_id[] = {
static int adv7180_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
- int ret;
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+ struct adv7180_state *state = to_state(sd);
- ret = i2c_smbus_write_byte_data(client, ADV7180_PWR_MAN_REG,
- ADV7180_PWR_MAN_OFF);
- if (ret < 0)
- return ret;
- return 0;
+ return adv7180_set_power(state, client, false);
}
static int adv7180_resume(struct device *dev)
@@ -656,10 +687,11 @@ static int adv7180_resume(struct device *dev)
struct adv7180_state *state = to_state(sd);
int ret;
- ret = i2c_smbus_write_byte_data(client, ADV7180_PWR_MAN_REG,
- ADV7180_PWR_MAN_ON);
- if (ret < 0)
- return ret;
+ if (state->powered) {
+ ret = adv7180_set_power(state, client, true);
+ if (ret)
+ return ret;
+ }
ret = init_device(client, state);
if (ret < 0)
return ret;