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Date: Mon, 21 Mar 2016 12:58:38 +0100
From: Heiner Kallweit <hkallweit1@...il.com>
To: Jacek Anaszewski <j.anaszewski@...sung.com>
Cc: "linux-leds@...r.kernel.org" <linux-leds@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 2/3] leds: triggers: add led_trigger_range_event for RGB
triggers
Add led_trigger_range_event() and supporting struct led_rgb_range
allowing to map a value within a value range to a color within a
color range.
Simple example would be to map a temperature with in a range to a
color between green and red.
Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
v2:
- moved the actual mapping to a helper in led-rgb-core.c
- adjusted commit message
- renamed struct led_trigger_range to led_rgb_range
---
drivers/leds/led-rgb-core.c | 40 ++++++++++++++++++++++++++++++++++++++++
include/linux/leds.h | 25 +++++++++++++++++++++++++
2 files changed, 65 insertions(+)
diff --git a/drivers/leds/led-rgb-core.c b/drivers/leds/led-rgb-core.c
index 63459e3..4ef24b5 100644
--- a/drivers/leds/led-rgb-core.c
+++ b/drivers/leds/led-rgb-core.c
@@ -73,3 +73,43 @@ enum led_brightness led_hsv_to_rgb(enum led_brightness hsv)
return (r << 16) + (g << 8) + b;
}
EXPORT_SYMBOL_GPL(led_hsv_to_rgb);
+
+static inline int led_range_interpolate(int value,
+ const struct led_rgb_range *range,
+ int x_start, int x_end)
+{
+ return x_start + DIV_ROUND_CLOSEST((value - range->start) *
+ (x_end - x_start), range->end - range->start);
+}
+
+enum led_brightness led_val_to_rgb_range(const struct led_rgb_range *range,
+ int value)
+{
+ int h, s, v, hs, he, ss, se, vs, ve, hdiff;
+
+ if (WARN_ON(range->start >= range->end))
+ return LED_OFF;
+
+ hs = range->color_start >> 16 & 0xff;
+ he = range->color_end >> 16 & 0xff;
+ ss = range->color_start >> 8 & 0xff;
+ se = range->color_end >> 8 & 0xff;
+ vs = range->color_start & 0xff;
+ ve = range->color_end & 0xff;
+ hdiff = (252 + he - hs) % 252;
+
+ /* on color circle, choose shortest way from start to end */
+ if (hdiff <= 126 && he < hs)
+ he += 252;
+ else if (hdiff > 126 && he > hs)
+ hs += 252;
+
+ value = clamp(value, range->start, range->end);
+
+ h = led_range_interpolate(value, range, hs, he) % 252;
+ s = led_range_interpolate(value, range, ss, se);
+ v = led_range_interpolate(value, range, vs, ve);
+
+ return LED_SET_HUE_SAT | h << 16 | s << 8 | v;
+}
+EXPORT_SYMBOL_GPL(led_val_to_rgb_range);
diff --git a/include/linux/leds.h b/include/linux/leds.h
index 07eb074..0bbc4eb 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -234,6 +234,23 @@ static inline bool led_sysfs_is_disabled(struct led_classdev *led_cdev)
*/
enum led_brightness led_hsv_to_rgb(enum led_brightness hsv);
+struct led_rgb_range {
+ int start;
+ int end;
+ /* HSV color model */
+ u32 color_start;
+ u32 color_end;
+};
+
+#if IS_ENABLED(CONFIG_LEDS_CLASS_RGB)
+enum led_brightness led_val_to_rgb_range(const struct led_rgb_range *range,
+ int value);
+#else
+static inline enum led_brightness led_val_to_rgb_range(
+ const struct led_rgb_range *range,
+ int value) { return LED_OFF; }
+#endif /* CONFIG_LEDS_CLASS_RGB */
+
/*
* LED Triggers
*/
@@ -342,6 +359,14 @@ static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
#endif /* CONFIG_LEDS_TRIGGERS */
+static inline void led_trigger_range_event(struct led_trigger *trigger,
+ const struct led_rgb_range *range,
+ int value)
+{
+ enum led_brightness brightness = led_val_to_rgb_range(range, value);
+ led_trigger_event(trigger, brightness);
+}
+
/* Trigger specific functions */
#ifdef CONFIG_LEDS_TRIGGER_IDE_DISK
extern void ledtrig_ide_activity(void);
--
2.7.3
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