Commit c01674e7 authored by Ricardo Ribalda Delgado's avatar Ricardo Ribalda Delgado Committed by Mauro Carvalho Chehab
Browse files

media: ad5820: Add support for enable pin 



This patch adds support for a programmable enable pin. It can be used in
situations where the ANA-vcc is not configurable (dummy-regulator), or
just to have a more fine control of the power saving.

The use of the enable pin is optional.

Signed-off-by: default avatarRicardo Ribalda Delgado <ribalda@kernel.org>
Acked-by: default avatarPavel Machek <pavel@ucw.cz>
Signed-off-by: default avatarSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+samsung@kernel.org>
parent 219ea61a

drivers/media/i2c/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -975,7 +975,7 @@ if MEDIA_CAMERA_SUPPORT 


config VIDEO_AD5820

	tristate "AD5820 lens voice coil support"

	depends on I2C && VIDEO_V4L2 && MEDIA_CONTROLLER

	depends on GPIOLIB && I2C && VIDEO_V4L2 && MEDIA_CONTROLLER

	help

	  This is a driver for the AD5820 camera lens voice coil.

	  It is used for example in Nokia N900 (RX-51).

drivers/media/i2c/ad5820.c

+17 −0
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ 
#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/regulator/consumer.h>

#include <linux/gpio/consumer.h>



#include <media/v4l2-ctrls.h>

#include <media/v4l2-device.h>
@@ -47,6 +48,8 @@ struct ad5820_device { 
	u32 focus_ramp_time;

	u32 focus_ramp_mode;



	struct gpio_desc *enable_gpio;



	struct mutex power_lock;

	int power_count;
@@ -114,6 +117,8 @@ static int ad5820_power_off(struct ad5820_device *coil, bool standby) 
		ret = ad5820_update_hw(coil);

	}



	gpiod_set_value_cansleep(coil->enable_gpio, 0);



	ret2 = regulator_disable(coil->vana);

	if (ret)

		return ret;
@@ -128,6 +133,8 @@ static int ad5820_power_on(struct ad5820_device *coil, bool restore) 
	if (ret < 0)

		return ret;



	gpiod_set_value_cansleep(coil->enable_gpio, 1);



	if (restore) {

		/* Restore the hardware settings. */

		coil->standby = false;
@@ -138,6 +145,7 @@ static int ad5820_power_on(struct ad5820_device *coil, bool restore) 
	return 0;



fail:

	gpiod_set_value_cansleep(coil->enable_gpio, 0);

	coil->standby = true;

	regulator_disable(coil->vana);
@@ -304,6 +312,15 @@ static int ad5820_probe(struct i2c_client *client, 
		return ret;

	}



	coil->enable_gpio = devm_gpiod_get_optional(&client->dev, "enable",

						    GPIOD_OUT_LOW);

	if (IS_ERR(coil->enable_gpio)) {

		ret = PTR_ERR(coil->enable_gpio);

		if (ret != -EPROBE_DEFER)

			dev_err(&client->dev, "could not get enable gpio\n");

		return ret;

	}



	mutex_init(&coil->power_lock);



	v4l2_i2c_subdev_init(&coil->subdev, client, &ad5820_ops);

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