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media: ov5693: Add support for a privacy-led GPIO

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Add support for a privacy-led GPIO.

Making the privacy LED to controlable from userspace, as using the LED
class subsystem would do, would make it too easy for spy-ware to disable
the LED.

To avoid this have the sensor driver directly control the LED.

Link: https://lore.kernel.org/linux-media/20221129231149.697154-2-hdegoede@redhat.com

Reviewed-by: Andy Shevchenko <andy@kernel.org>
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Hans de Goede 2022-11-29 23:11:44 +00:00 committed by Mauro Carvalho Chehab
parent 2496ee3821
commit 2fa8d1d768
1 changed files with 10 additions and 0 deletions
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10
drivers/media/i2c/ov5693.c
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@ -156,6 +156,7 @@ struct ov5693_device {
struct gpio_desc *reset;
struct gpio_desc *powerdown;
struct gpio_desc *privacy_led;
struct regulator_bulk_data supplies[OV5693_NUM_SUPPLIES];
struct clk *xvclk;
@ -789,6 +790,7 @@ static int ov5693_sensor_init(struct ov5693_device *ov5693)
static void ov5693_sensor_powerdown(struct ov5693_device *ov5693)
{
gpiod_set_value_cansleep(ov5693->privacy_led, 0);
gpiod_set_value_cansleep(ov5693->reset, 1);
gpiod_set_value_cansleep(ov5693->powerdown, 1);
@ -818,6 +820,7 @@ static int ov5693_sensor_powerup(struct ov5693_device *ov5693)
gpiod_set_value_cansleep(ov5693->powerdown, 0);
gpiod_set_value_cansleep(ov5693->reset, 0);
gpiod_set_value_cansleep(ov5693->privacy_led, 1);
usleep_range(5000, 7500);
@ -1325,6 +1328,13 @@ static int ov5693_configure_gpios(struct ov5693_device *ov5693)
return PTR_ERR(ov5693->powerdown);
}
ov5693->privacy_led = devm_gpiod_get_optional(ov5693->dev, "privacy-led",
GPIOD_OUT_LOW);
if (IS_ERR(ov5693->privacy_led)) {
dev_err(ov5693->dev, "Error fetching privacy-led GPIO\n");
return PTR_ERR(ov5693->privacy_led);
}
return 0;
}