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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: Ricardo Ribalda Delgado <ribalda@kernel.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Ricardo Ribalda Delgado 2019-10-07 10:28:53 -03:00 committed by Mauro Carvalho Chehab
parent 219ea61a7a
commit c01674e75a
2 changed files with 18 additions and 1 deletions
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2
drivers/media/i2c/Kconfig
View File

@ -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).

17
drivers/media/i2c/ad5820.c
View File

@ -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);