[media] em28xx: prepare for supporting multiple LEDs

Introduce a LED role and store all LEDs in an array.
Also provide a helper function to retrieve a specific LED.
Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/usb/em28xx/em28xx-core.c

@@ -600,6 +600,22 @@ int em28xx_colorlevels_set_default(struct em28xx *dev)
 	return em28xx_write_reg(dev, EM28XX_R1A_BOFFSET, 0x00);
 }
 
+const struct em28xx_led *em28xx_find_led(struct em28xx *dev,
+					 enum em28xx_led_role role)
+{
+	if (dev->board.leds) {
+		u8 k = 0;
+		while (dev->board.leds[k].role >= 0 &&
+			       dev->board.leds[k].role < EM28XX_NUM_LED_ROLES) {
+			if (dev->board.leds[k].role == role)
+				return &dev->board.leds[k];
+			k++;
+		}
+	}
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(em28xx_find_led);
+
 int em28xx_capture_start(struct em28xx *dev, int start)
 {
 	int rc;
@@ -645,9 +661,10 @@ int em28xx_capture_start(struct em28xx *dev, int start)
 		return rc;
 
 	/* Switch (explicitly controlled) analog capturing LED on/off */
-	if ((dev->mode == EM28XX_ANALOG_MODE)
-	    && dev->board.analog_capturing_led) {
-		struct em28xx_led *led = dev->board.analog_capturing_led;
+	if (dev->mode == EM28XX_ANALOG_MODE) {
+		const struct em28xx_led *led;
+		led = em28xx_find_led(dev, EM28XX_LED_ANALOG_CAPTURING);
+		if (led)
 			em28xx_write_reg_bits(dev, led->gpio_reg,
 					      (!start ^ led->inverted) ?
 					      ~led->gpio_mask : led->gpio_mask,

drivers/media/usb/em28xx/em28xx.h

@@ -377,7 +377,13 @@ enum em28xx_adecoder {
 	EM28XX_TVAUDIO,
 };
 
+enum em28xx_led_role {
+	EM28XX_LED_ANALOG_CAPTURING = 0,
+	EM28XX_NUM_LED_ROLES, /* must be the last */
+};
+
 struct em28xx_led {
+	enum em28xx_led_role role;
 	u8 gpio_reg;
 	u8 gpio_mask;
 	bool inverted;
@@ -433,7 +439,7 @@ struct em28xx_board {
 	char			  *ir_codes;
 
 	/* LEDs that need to be controlled explicitly */
-	struct em28xx_led	  *analog_capturing_led;
+	struct em28xx_led	  *leds;
 
 	/* Buttons */
 	struct em28xx_button	  *buttons;
@@ -711,6 +717,8 @@ int em28xx_audio_analog_set(struct em28xx *dev);
 int em28xx_audio_setup(struct em28xx *dev);
 
 int em28xx_colorlevels_set_default(struct em28xx *dev);
+const struct em28xx_led *em28xx_find_led(struct em28xx *dev,
+					 enum em28xx_led_role role);
 int em28xx_capture_start(struct em28xx *dev, int start);
 int em28xx_vbi_supported(struct em28xx *dev);
 int em28xx_set_outfmt(struct em28xx *dev);