Commit 0a844ab7 authored by Jacopo Mondi's avatar Jacopo Mondi Committed by Mauro Carvalho Chehab
Browse files

media: i2c: ov5670: Probe GPIOs 



The OV5670 has a powerdown and reset pin, named respectively "PWDN" and
"XSHUTDOWN".

Optionally probe the gpios connected to the pins during the driver probe
routine.

Signed-off-by: default avatarJacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: default avatarLuca Weiss <luca@z3ntu.xyz>
Signed-off-by: default avatarSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@kernel.org>
parent cf9ab879

drivers/media/i2c/ov5670.c

+28 −0
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ 


#include <linux/acpi.h>

#include <linux/clk.h>

#include <linux/gpio/consumer.h>

#include <linux/i2c.h>

#include <linux/mod_devicetable.h>

#include <linux/module.h>
@@ -1848,6 +1849,10 @@ struct ov5670 { 
	/* Regulators */

	struct regulator_bulk_data supplies[OV5670_NUM_SUPPLIES];



	/* Power-down and reset gpios. */

	struct gpio_desc *pwdn_gpio; /* PWDNB pin. */

	struct gpio_desc *reset_gpio; /* XSHUTDOWN pin. */



	/* To serialize asynchronus callbacks */

	struct mutex mutex;
@@ -2500,6 +2505,23 @@ static int ov5670_regulators_probe(struct ov5670 *ov5670) 
				       ov5670->supplies);

}



static int ov5670_gpio_probe(struct ov5670 *ov5670)

{

	struct i2c_client *client = v4l2_get_subdevdata(&ov5670->sd);



	ov5670->pwdn_gpio = devm_gpiod_get_optional(&client->dev, "powerdown",

						    GPIOD_OUT_LOW);

	if (IS_ERR(ov5670->pwdn_gpio))

		return PTR_ERR(ov5670->pwdn_gpio);



	ov5670->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",

						     GPIOD_OUT_LOW);

	if (IS_ERR(ov5670->reset_gpio))

		return PTR_ERR(ov5670->reset_gpio);



	return 0;

}



static int ov5670_probe(struct i2c_client *client)

{

	struct ov5670 *ov5670;
@@ -2540,6 +2562,12 @@ static int ov5670_probe(struct i2c_client *client) 
		goto error_print;

	}



	ret = ov5670_gpio_probe(ov5670);

	if (ret) {

		err_msg = "GPIO probe failed";

		goto error_print;

	}



	full_power = acpi_dev_state_d0(&client->dev);

	if (full_power) {

		/* Check module identity */