[PATCH v4 1/9] misc: gpio_led: fix broken coloured LED status functions

[Christian Marangi <ansuelsmth@gmail.com>]

The GPIO LED driver is a backend to provide LED status functions via the
GPIO common functions.

The coloured LED functions are currently broken and deviates from what
is written in README.LED

Quoting the README.LED:

CONFIG_STATUS_LED_RED is the red LED. It is used to signal errors.
This must be a valid LED number (0-5). Other similar color LED's macros
are CONFIG_STATUS_LED_GREEN, CONFIG_STATUS_LED_YELLOW and
CONFIG_STATUS_LED_BLUE.

Hence the value of the config must refer to the ID.

Currently this is not the case and the driver expect the GPIO ID to be
put in these config. On top of this to actually have these functions, a
never define in Kconfig config must be declared to actually compile
them. (CONFIG_GPIO_LED_STUBS)

To fix this and the GPIO problem, introduce some define that reference
the LED_STATUS_BIT<n> config to have the ID->BIT connection (as
described in Docs) and drop the never defined config.

The gpio_led already provide a wrapper to the functions and should not
be enabled if the board provide their custom function hence it's ok to
also provide the wrapper for the colour functions.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
 drivers/misc/gpio_led.c | 31 +++++++++++++++++++------------
 1 file changed, 19 insertions(+), 12 deletions(-)

diff --git a/drivers/misc/gpio_led.c b/drivers/misc/gpio_led.c
index e63689967a7..6626b137087 100644
--- a/drivers/misc/gpio_led.c
+++ b/drivers/misc/gpio_led.c
@@ -51,56 +51,63 @@ void __led_toggle(led_id_t mask)
 	gpio_set_value(mask, !gpio_get_value(mask));
 }
 
-#ifdef CONFIG_GPIO_LED_STUBS
-
 /* 'generic' override of colored LED stubs, to use GPIO functions instead */
 
+/* We support up to 6 LEDs, LED 0 STATUS BIT doesn't have the number suffix */
+#define GPIO_BIT0	CONFIG_LED_STATUS_BIT
+#define GPIO_BIT1	CONFIG_LED_STATUS_BIT1
+#define GPIO_BIT2	CONFIG_LED_STATUS_BIT2
+#define GPIO_BIT3	CONFIG_LED_STATUS_BIT3
+#define GPIO_BIT4	CONFIG_LED_STATUS_BIT4
+#define GPIO_BIT5	CONFIG_LED_STATUS_BIT5
+/* C preprocessor magic way to generate a GPIO_LED<id> reference */
+#define GPIO_BIT(id)	___PASTE(GPIO_BIT, id)
+
 #ifdef CONFIG_LED_STATUS_RED
+
 void red_led_on(void)
 {
-	__led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_ON);
+	__led_set(GPIO_BIT(CONFIG_LED_STATUS_RED), CONFIG_LED_STATUS_ON);
 }
 
 void red_led_off(void)
 {
-	__led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_OFF);
+	__led_set(GPIO_BIT(CONFIG_LED_STATUS_RED), CONFIG_LED_STATUS_OFF);
 }
 #endif
 
 #ifdef CONFIG_LED_STATUS_GREEN
 void green_led_on(void)
 {
-	__led_set(CONFIG_LED_STATUS_GREEN, CONFIG_LED_STATUS_ON);
+	__led_set(GPIO_BIT(CONFIG_LED_STATUS_GREEN), CONFIG_LED_STATUS_ON);
 }
 
 void green_led_off(void)
 {
-	__led_set(CONFIG_LED_STATUS_GREEN, CONFIG_LED_STATUS_OFF);
+	__led_set(GPIO_BIT(CONFIG_LED_STATUS_GREEN), CONFIG_LED_STATUS_OFF);
 }
 #endif
 
 #ifdef CONFIG_LED_STATUS_YELLOW
 void yellow_led_on(void)
 {
-	__led_set(CONFIG_LED_STATUS_YELLOW, CONFIG_LED_STATUS_ON);
+	__led_set(GPIO_BIT(CONFIG_LED_STATUS_YELLOW), CONFIG_LED_STATUS_ON);
 }
 
 void yellow_led_off(void)
 {
-	__led_set(CONFIG_LED_STATUS_YELLOW, CONFIG_LED_STATUS_OFF);
+	__led_set(GPIO_BIT(CONFIG_LED_STATUS_YELLOW), CONFIG_LED_STATUS_OFF);
 }
 #endif
 
 #ifdef CONFIG_LED_STATUS_BLUE
 void blue_led_on(void)
 {
-	__led_set(CONFIG_LED_STATUS_BLUE, CONFIG_LED_STATUS_ON);
+	__led_set(GPIO_BIT(CONFIG_LED_STATUS_BLUE), CONFIG_LED_STATUS_ON);
 }
 
 void blue_led_off(void)
 {
-	__led_set(CONFIG_LED_STATUS_BLUE, CONFIG_LED_STATUS_OFF);
+	__led_set(GPIO_BIT(CONFIG_LED_STATUS_BLUE), CONFIG_LED_STATUS_OFF);
 }
 #endif
-
-#endif /* CONFIG_GPIO_LED_STUBS */
-- 
2.43.0