[media] em28xx: add support for illumination button and LED
The SpeedLink VAD Laplace webcam is equipped with an illumination button and
an illumination LED. When the button is pressed, the driver must toggle the
LED state via the corresponding GPO port.
Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
diff --git a/drivers/media/usb/em28xx/em28xx-input.c b/drivers/media/usb/em28xx/em28xx-input.c
index ebc5387..e0acc92 100644
--- a/drivers/media/usb/em28xx/em28xx-input.c
+++ b/drivers/media/usb/em28xx/em28xx-input.c
@@ -480,6 +480,7 @@
u8 i, j;
int regval;
bool is_pressed, was_pressed;
+ const struct em28xx_led *led;
/* Poll and evaluate all addresses */
for (i = 0; i < dev->num_button_polling_addresses; i++) {
@@ -524,6 +525,15 @@
input_report_key(dev->sbutton_input_dev,
EM28XX_SNAPSHOT_KEY, 0);
break;
+ case EM28XX_BUTTON_ILLUMINATION:
+ led = em28xx_find_led(dev,
+ EM28XX_LED_ILLUMINATION);
+ /* Switch illumination LED on/off */
+ if (led)
+ em28xx_toggle_reg_bits(dev,
+ led->gpio_reg,
+ led->gpio_mask);
+ break;
default:
WARN_ONCE(1, "BUG: unhandled button role.");
}
@@ -600,10 +610,17 @@
WARN_ONCE(1, "BUG: maximum number of button polling addresses exceeded.");
addr_new = 0;
}
- /* Register input device (if needed) */
+ /* Button role specific checks and actions */
if (button->role == EM28XX_BUTTON_SNAPSHOT) {
+ /* Register input device */
if (em28xx_register_snapshot_button(dev) < 0)
addr_new = 0;
+ } else if (button->role == EM28XX_BUTTON_ILLUMINATION) {
+ /* Check sanity */
+ if (!em28xx_find_led(dev, EM28XX_LED_ILLUMINATION)) {
+ em28xx_errdev("BUG: illumination button defined, but no illumination LED.\n");
+ addr_new = 0;
+ }
}
/* Add read address to list of polling addresses */
if (addr_new) {