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Commit e246c333 authored by Lars-Peter Clausen's avatar Lars-Peter Clausen Committed by Mauro Carvalho Chehab
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[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: default avatarLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <m.chehab@samsung.com>
parent fa5b7945

drivers/media/i2c/adv7180.c

+42 −10
Original line number Diff line number Diff line
@@ -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 @@ static int adv7180_s_std(struct v4l2_subdev *sd, v4l2_std_id std) 
	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)

	if (state->powered) {

		ret = adv7180_set_power(state, client, true);

		if (ret)

			return ret;

	}

	ret = init_device(client, state);

	if (ret < 0)

		return ret;