Commit 65d9e14a authored by Steve Longerbeam's avatar Steve Longerbeam Committed by Mauro Carvalho Chehab
Browse files

[media] media: adv7180: add power pin control 



Some targets control the ADV7180 power pin via a gpio, so add
optional support for "powerdown" pin control.

Signed-off-by: default avatarSteve Longerbeam <steve_longerbeam@mentor.com>
Tested-by: default avatarTim Harvey <tharvey@gateworks.com>
Acked-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 <mchehab@s-opensource.com>
parent ce5d6290

Documentation/devicetree/bindings/media/i2c/adv7180.txt

+5 −0
Original line number Diff line number Diff line
@@ -15,6 +15,11 @@ Required Properties : 
		"adi,adv7282"

		"adi,adv7282-m"



Optional Properties :

- powerdown-gpios: reference to the GPIO connected to the powerdown pin,

  if any.





Example:



	i2c0@1c22000 {

drivers/media/i2c/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -187,7 +187,7 @@ comment "Video decoders" 


config VIDEO_ADV7180

	tristate "Analog Devices ADV7180 decoder"

	depends on VIDEO_V4L2 && I2C && VIDEO_V4L2_SUBDEV_API

	depends on GPIOLIB && VIDEO_V4L2 && I2C && VIDEO_V4L2_SUBDEV_API

	---help---

	  Support for the Analog Devices ADV7180 video decoder.

drivers/media/i2c/adv7180.c

+27 −0
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ 
#include <linux/i2c.h>

#include <linux/slab.h>

#include <linux/of.h>

#include <linux/gpio/consumer.h>

#include <linux/videodev2.h>

#include <media/v4l2-ioctl.h>

#include <media/v4l2-event.h>
@@ -213,6 +214,7 @@ struct adv7180_state { 
	struct media_pad	pad;

	struct mutex		mutex; /* mutual excl. when accessing chip */

	int			irq;

	struct gpio_desc	*pwdn_gpio;

	v4l2_std_id		curr_norm;

	bool			powered;

	bool			streaming;
@@ -463,6 +465,19 @@ static int adv7180_g_std(struct v4l2_subdev *sd, v4l2_std_id *norm) 
	return 0;

}



static void adv7180_set_power_pin(struct adv7180_state *state, bool on)

{

	if (!state->pwdn_gpio)

		return;



	if (on) {

		gpiod_set_value_cansleep(state->pwdn_gpio, 0);

		usleep_range(5000, 10000);

	} else {

		gpiod_set_value_cansleep(state->pwdn_gpio, 1);

	}

}



static int adv7180_set_power(struct adv7180_state *state, bool on)

{

	u8 val;
@@ -1210,6 +1225,8 @@ static int init_device(struct adv7180_state *state) 


	mutex_lock(&state->mutex);



	adv7180_set_power_pin(state, true);



	adv7180_write(state, ADV7180_REG_PWR_MAN, ADV7180_PWR_MAN_RES);

	usleep_range(5000, 10000);
@@ -1279,6 +1296,14 @@ static int adv7180_probe(struct i2c_client *client, 
	state->field = V4L2_FIELD_INTERLACED;

	state->chip_info = (struct adv7180_chip_info *)id->driver_data;



	state->pwdn_gpio = devm_gpiod_get_optional(&client->dev, "powerdown",

						   GPIOD_OUT_HIGH);

	if (IS_ERR(state->pwdn_gpio)) {

		ret = PTR_ERR(state->pwdn_gpio);

		v4l_err(client, "request for power pin failed: %d\n", ret);

		return ret;

	}



	if (state->chip_info->flags & ADV7180_FLAG_MIPI_CSI2) {

		state->csi_client = i2c_new_dummy(client->adapter,

				ADV7180_DEFAULT_CSI_I2C_ADDR);
@@ -1370,6 +1395,8 @@ static int adv7180_remove(struct i2c_client *client) 
	if (state->chip_info->flags & ADV7180_FLAG_MIPI_CSI2)

		i2c_unregister_device(state->csi_client);



	adv7180_set_power_pin(state, false);



	mutex_destroy(&state->mutex);



	return 0;