Add a new led_mc_set_brightness() function for in kernel color/brightness
changing of multi-color LEDs.
led-class-multicolor can be build as a module and led_mc_set_brightness()
will have the builtin callers, so put led_mc_set_brightness() inside
led-core instead, just like how led_set_brightness() is part of the core
and not of the led-class object.
This also adds a new LED_MULTI_COLOR led_classdev flag to allow
led_mc_set_brightness() to verify that it is operating on a multi-color
LED classdev, avoiding casting the passed in LED classdev to a multi-color
LED classdev, when it actually is not a multi-color LED.
Reviewed-by: Jacek Anaszewski <jacek.anaszewski@xxxxxxxxx>
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
drivers/leds/led-class-multicolor.c | 1 +
drivers/leds/led-core.c | 31 +++++++++++++++++++++++++++++
include/linux/leds.h | 20 +++++++++++++++++++
3 files changed, 52 insertions(+)
diff --git a/drivers/leds/led-class-multicolor.c b/drivers/leds/led-class-multicolor.c
index ec62a4811613..df01c0e66c8b 100644
--- a/drivers/leds/led-class-multicolor.c
+++ b/drivers/leds/led-class-multicolor.c
@@ -134,6 +134,7 @@ int led_classdev_multicolor_register_ext(struct device *parent,
return -EINVAL;
led_cdev = &mcled_cdev->led_cdev;
+ led_cdev->flags |= LED_MULTI_COLOR;
mcled_cdev->led_cdev.groups = led_multicolor_groups;
return led_classdev_register_ext(parent, led_cdev, init_data);
diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c
index 89c9806cc97f..ef7d1c6767ca 100644
--- a/drivers/leds/led-core.c
+++ b/drivers/leds/led-core.c
@@ -8,6 +8,7 @@
*/
#include <linux/kernel.h>
+#include <linux/led-class-multicolor.h>
#include <linux/leds.h>
#include <linux/list.h>
#include <linux/module.h>
@@ -362,6 +363,36 @@ int led_set_brightness_sync(struct led_classdev *led_cdev, unsigned int value)
}
EXPORT_SYMBOL_GPL(led_set_brightness_sync);
+/*
+ * This is a led-core function because just like led_set_brightness()
+ * it is used in the kernel by e.g. triggers.
+ */
+void led_mc_set_brightness(struct led_classdev *led_cdev,
+ unsigned int *intensity_value, unsigned int num_colors,
+ unsigned int brightness)
+{
+ struct led_classdev_mc *mcled_cdev;
+ unsigned int i;
+
+ if (!(led_cdev->flags & LED_MULTI_COLOR)) {
+ dev_err_once(led_cdev->dev, "error not a multi-color LED\n");
+ return;
+ }
+
+ mcled_cdev = lcdev_to_mccdev(led_cdev);
+ if (num_colors != mcled_cdev->num_colors) {
+ dev_err_once(led_cdev->dev, "error num_colors mismatch %u != %u\n",
+ num_colors, mcled_cdev->num_colors);
+ return;
+ }
+
+ for (i = 0; i < mcled_cdev->num_colors; i++)
+ mcled_cdev->subled_info[i].intensity = intensity_value[i];
+
+ led_set_brightness(led_cdev, brightness);
+}
+EXPORT_SYMBOL_GPL(led_mc_set_brightness);
+
int led_update_brightness(struct led_classdev *led_cdev)
{
int ret;
diff --git a/include/linux/leds.h b/include/linux/leds.h
index db6b114bb3d9..e80a185e255a 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -107,6 +107,7 @@ struct led_classdev {
#define LED_BRIGHT_HW_CHANGED BIT(21)
#define LED_RETAIN_AT_SHUTDOWN BIT(22)
#define LED_INIT_DEFAULT_TRIGGER BIT(23)
+#define LED_MULTI_COLOR BIT(24)
/* set_brightness_work / blink_timer flags, atomic, private. */
unsigned long work_flags;
@@ -373,6 +374,25 @@ void led_set_brightness(struct led_classdev *led_cdev, unsigned int brightness);
*/
int led_set_brightness_sync(struct led_classdev *led_cdev, unsigned int value);
+/**
+ * led_mc_set_brightness - set mc LED color intensity values and brightness
+ * @led_cdev: the LED to set
+ * @intensity_value: array of per color intensity values to set
+ * @num_colors: amount of entries in intensity_value array
+ * @brightness: the brightness to set the LED to
+ *
+ * Set a multi-color LED's per color intensity values and brightness.
+ * If necessary, this cancels the software blink timer. This function is
+ * guaranteed not to sleep.
+ *
+ * Calling this function on a non multi-color led_classdev or with the wrong
+ * num_colors value is an error. In this case an error will be logged once
+ * and the call will do nothing.
+ */
+void led_mc_set_brightness(struct led_classdev *led_cdev,
+ unsigned int *intensity_value, unsigned int num_colors,
+ unsigned int brightness);
+
/**
* led_update_brightness - update LED brightness
* @led_cdev: the LED to query
--
2.44.0
