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

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>

diff --git a/drivers/media/i2c/ov5693.c b/drivers/media/i2c/ov5693.c
index a97ec13..e3c3bed 100644 (file)
--- a/drivers/media/i2c/ov5693.c
+++ b/drivers/media/i2c/ov5693.c
@@ -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;
 }