From 4dc6cc47d5fa927cc1a013b7b55fea04c9a7d222 Mon Sep 17 00:00:00 2001
From: Thomas BRUNEL <thomas.brunel@madic.com>
Date: Mon, 7 Sep 2026 16:54:54 +0200
Subject: [PATCH] feat: add multi-intensity LED support

Signed-off-by: Thomas BRUNEL <thomas.brunel@madic.com>
---
 src/led.c        | 63 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/led.h        |  2 ++
 tests/test_led.c | 15 ++++++++++++
 3 files changed, 80 insertions(+)

diff --git a/src/led.c b/src/led.c
index 5facbc4..80e7eed 100644
--- a/src/led.c
+++ b/src/led.c
@@ -101,6 +101,33 @@ void led_free(led_t *led) {
     free(led);
 }
 
+int led_get_multi_intensity(led_t *led, unsigned int *red, unsigned int *green, unsigned int *blue) {
+    char led_path[P_PATH_MAX];
+    char buf[16];
+    int fd, ret;
+
+    snprintf(led_path, sizeof(led_path), "/sys/class/leds/%s/multi_intensity", led->name);
+
+    if ((fd = open(led_path, O_RDONLY)) < 0)
+        return _led_error(led, LED_ERROR_IO, errno, "Opening LED 'multi_intensity'");
+
+    if ((ret = read(fd, buf, sizeof(buf) - 1)) < 0) {
+        int errsv = errno;
+        close(fd);
+        return _led_error(led, LED_ERROR_IO, errsv, "Reading LED 'multi_intensity'");
+    }
+
+    buf[ret] = '\0';
+
+    if (close(fd) < 0)
+        return _led_error(led, LED_ERROR_IO, errno, "Closing LED 'multi_intensity'");
+
+    if (sscanf(buf, "%u %u %u", red, green, blue) != 3)
+        return _led_error(led, LED_ERROR_IO, 0, "Invalid LED 'multi_intensity' value");
+
+    return 0;
+}
+
 int led_get_brightness(led_t *led, unsigned int *brightness) {
     char led_path[P_PATH_MAX];
     char buf[16];
@@ -264,6 +291,42 @@ int led_get_triggers_count(led_t *led, unsigned int *count) {
     return 0;
 }
 
+int led_set_multi_intensity(led_t *led, unsigned int red, unsigned int green, unsigned int blue) {
+    char led_path[P_PATH_MAX];
+    char buf[16];
+    int fd, len;
+
+    if (red > 255) {
+        return _led_error(led, LED_ERROR_ARG, 0, "Red out of bounds (max is 255)");
+    }
+
+    if (green > 255) {
+        return _led_error(led, LED_ERROR_ARG, 0, "Green out of bounds (max is 255)");
+    }
+
+    if (blue > 255) {
+        return _led_error(led, LED_ERROR_ARG, 0, "blue out of bounds (max is 255)");
+    }
+
+    snprintf(led_path, sizeof(led_path), "/sys/class/leds/%s/multi_intensity", led->name);
+
+    if ((fd = open(led_path, O_WRONLY)) < 0)
+        return _led_error(led, LED_ERROR_IO, errno, "Opening LED 'multi_intensity'");
+
+    len = snprintf(buf, sizeof(buf), "%u %u %u\n", red, green, blue);
+
+    if (write(fd, buf, len) < 0) {
+        int errsv = errno;
+        close(fd);
+        return _led_error(led, LED_ERROR_IO, errsv, "Writing LED 'multi_intensity'");
+    }
+
+    if (close(fd) < 0)
+        return _led_error(led, LED_ERROR_IO, errno, "Closing LED 'multi_intensity'");
+
+    return 0;
+}
+
 int led_set_brightness(led_t *led, unsigned int brightness) {
     char led_path[P_PATH_MAX];
     char buf[16];
diff --git a/src/led.h b/src/led.h
index 6de3414..6ea5b0b 100644
--- a/src/led.h
+++ b/src/led.h
@@ -34,6 +34,7 @@ int led_close(led_t *led);
 void led_free(led_t *led);
 
 /* Getters */
+int led_get_multi_intensity(led_t *led, unsigned int *red, unsigned int *green, unsigned int *blue);
 int led_get_brightness(led_t *led, unsigned int *brightness);
 int led_get_max_brightness(led_t *led, unsigned int *max_brightness);
 int led_get_trigger(led_t *led, char *str, size_t len);
@@ -41,6 +42,7 @@ int led_get_triggers_entry(led_t *led, unsigned int index, char *str, size_t len
 int led_get_triggers_count(led_t *led, unsigned int *count);
 
 /* Setters */
+int led_set_multi_intensity(led_t *led, unsigned int red, unsigned int green, unsigned int blue);
 int led_set_brightness(led_t *led, unsigned int brightness);
 int led_set_trigger(led_t *led, const char *trigger);
 
diff --git a/tests/test_led.c b/tests/test_led.c
index fb58117..cf58802 100644
--- a/tests/test_led.c
+++ b/tests/test_led.c
@@ -28,6 +28,9 @@ void test_open_config_close(void) {
     unsigned int max_brightness;
     unsigned int brightness;
     unsigned int triggers_count;
+    unsigned int red;
+    unsigned int green;
+    unsigned int blue;
     bool value;
 
     ptest();
@@ -50,6 +53,18 @@ void test_open_config_close(void) {
     passert(led_get_max_brightness(led, &max_brightness) == 0);
     passert(max_brightness > 0);
 
+    /* Check multi-intensity values */
+    passert(led_set_multi_intensity(led, 1, 2, 3) == 0);
+    usleep(10000);
+    passert(led_get_multi_intensity(led, &red, &green, &blue) == 0);
+    passert(red == 1);
+    passert(green == 2);
+    passert(blue == 3);
+    passert(led_set_multi_intensity(led, 256, 0, 0) == LED_ERROR_ARG);
+    passert(led_set_multi_intensity(led, 0, 256, 0) == LED_ERROR_ARG);
+    passert(led_set_multi_intensity(led, 0, 0, 256) == LED_ERROR_ARG);
+    passert(led_set_multi_intensity(led, 0, 0, 0) == 0);
+
     /* Check setting invalid brightness */
     passert(led_set_brightness(led, max_brightness + 1) == LED_ERROR_ARG);