mediatek: add led count

The LEDs connected to the MCU are so-called smart LEDs and their signal is
daisy-chained. Because of this, the MCU needs to be told how many LEDs are
connected. It also means the LEDs could be individually controlled, if the MCU
has a command for this.

Signed-off-by: Sven Wegener <sven.wegener@stealer.net>
(cherry picked from commit 76198e8f09a607c6aca2621f59d7a4cd7f6653e3)

diff --git a/target/linux/mediatek/files-5.10/drivers/leds/leds-ubnt-ledbar.c b/target/linux/mediatek/files-5.10/drivers/leds/leds-ubnt-ledbar.c
index 10d240d2bebd2c99564969c3ed184099136b8d42..555340c5e87fd211b80dbf3a1a62b348bb25b940 100644 (file)
--- a/target/linux/mediatek/files-5.10/drivers/leds/leds-ubnt-ledbar.c
+++ b/target/linux/mediatek/files-5.10/drivers/leds/leds-ubnt-ledbar.c
@@ -31,9 +31,11 @@
 #define UBNT_LEDBAR_TRANSACTION_BLUE_IDX       2
 #define UBNT_LEDBAR_TRANSACTION_GREEN_IDX      3
 #define UBNT_LEDBAR_TRANSACTION_RED_IDX                4
+#define UBNT_LEDBAR_TRANSACTION_LED_COUNT_IDX  6
 
 struct ubnt_ledbar {
        struct mutex lock;
+       u32 led_count;
        struct i2c_client *client;
        struct led_classdev led_red;
        struct led_classdev led_green;
@@ -60,7 +62,7 @@ static int ubnt_ledbar_apply_state(struct ubnt_ledbar *ledbar)
        char setup_msg[UBNT_LEDBAR_TRANSACTION_LENGTH] = {0x40, 0x10, 0x00, 0x00,
                                                          0x00, 0x00, 0x00, 0x11};
        char led_msg[UBNT_LEDBAR_TRANSACTION_LENGTH] = {0x40, 0x00, 0x00, 0x00,
-                                                       0x00, 0x00, 0x01, 0x00};
+                                                       0x00, 0x00, 0x00, 0x00};
        char i2c_response;
        int ret = 0;
 
@@ -69,6 +71,7 @@ static int ubnt_ledbar_apply_state(struct ubnt_ledbar *ledbar)
        led_msg[UBNT_LEDBAR_TRANSACTION_BLUE_IDX] = ledbar->led_blue.brightness;
        led_msg[UBNT_LEDBAR_TRANSACTION_GREEN_IDX] = ledbar->led_green.brightness;
        led_msg[UBNT_LEDBAR_TRANSACTION_RED_IDX] = ledbar->led_red.brightness;
+       led_msg[UBNT_LEDBAR_TRANSACTION_LED_COUNT_IDX] = ledbar->led_count;
 
        gpiod_set_value(ledbar->enable_gpio, 1);
 
@@ -191,6 +194,9 @@ static int ubnt_ledbar_probe(struct i2c_client *client,
                return ret;
        }
 
+       ledbar->led_count = 1;
+       of_property_read_u32(np, "led-count", &ledbar->led_count);
+
        ledbar->client = client;
 
        mutex_init(&ledbar->lock);