leds: add multi-control for leds's trigger.

userspace can control all leds by one ioctl through file node:
/dev/led_multi_ctrl.

Change-Id: I10ac19b86b46b3dc9a88809f1be5ebc95398212c
Signed-off-by: Wenping Zhang <wenping.zhang@rock-chips.com>

Author: Wenping Zhang

drivers/leds/led-triggers.c

@@ -175,6 +175,26 @@ void led_trigger_set_default(struct led_classdev *led_cdev)
 }
 EXPORT_SYMBOL_GPL(led_trigger_set_default);
 
+#ifdef CONFIG_LEDS_TRIGGER_MULTI_CTRL
+void led_trigger_set_by_name(struct led_classdev *led_cdev, char *trig_name)
+{
+	struct led_trigger *trig;
+
+	if (!trig_name)
+		return;
+
+	down_read(&triggers_list_lock);
+	down_write(&led_cdev->trigger_lock);
+	list_for_each_entry(trig, &trigger_list, next_trig) {
+		if (!strcmp(trig_name, trig->name))
+			led_trigger_set(led_cdev, trig);
+	}
+	up_write(&led_cdev->trigger_lock);
+	up_read(&triggers_list_lock);
+}
+EXPORT_SYMBOL_GPL(led_trigger_set_by_name);
+#endif
+
 void led_trigger_rename_static(const char *name, struct led_trigger *trig)
 {
 	/* new name must be on a temporary string to prevent races */

drivers/leds/leds-multi.h

@@ -0,0 +1,63 @@
+/*
+ * LED MULTI-CONTROL
+ *
+ * Copyright 2017 Allen Zhang <zwp@rock-chips.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+#ifndef __LEDS_MULTI_H_INCLUDED
+#define __LEDS_MULTI_H_INCLUDED
+
+enum {
+	TRIG_NONE = 0,
+	TRIG_DEF_ON,
+	TRIG_TIMER,
+	TRIG_ONESHOT,
+	TRIG_MAX,
+};
+
+struct led_ctrl_data {
+	u32 trigger;
+	/* the delay time(ms) of triggering a trigger */
+	u32 delayed_trigger_ms;
+	u32 brightness;
+	u32 delay_on;
+	u32 delay_off;
+} __packed;
+
+struct led_ctrl_scroll_data {
+	u64 init_bitmap;
+	/* the shift bits on every scrolling time*/
+	u32 shifts;
+	u32 shift_delay_ms;
+} __packed;
+
+struct led_ctrl_breath_data {
+	u64 background_bitmap;
+	u64 breath_bitmap;
+	u32 change_delay_ms;
+	u32 breath_steps;
+} __packed;
+
+#define MAX_LEDS_NUMBER	64
+
+#define LEDS_MULTI_CTRL_IOCTL_MAGIC	'z'
+
+#define LEDS_MULTI_CTRL_IOCTL_MULTI_SET	\
+	_IOW(LEDS_MULTI_CTRL_IOCTL_MAGIC, 0x01, struct led_ctrl_data*)
+#define LEDS_MULTI_CTRL_IOCTL_GET_LED_NUMBER	\
+	_IOR(LEDS_MULTI_CTRL_IOCTL_MAGIC, 0x02, int)
+#define LEDS_MULTI_CTRL_IOCTL_MULTI_SET_SCROLL	\
+	_IOW(LEDS_MULTI_CTRL_IOCTL_MAGIC, 0x03, struct led_ctrl_scroll_data*)
+#define LEDS_MULTI_CTRL_IOCTL_MULTI_SET_BREATH	\
+	_IOW(LEDS_MULTI_CTRL_IOCTL_MAGIC, 0x04, struct led_ctrl_breath_data*)
+
+int led_multi_control_register(struct led_classdev *led_cdev);
+int led_multi_control_unregister(struct led_classdev *led_cdev);
+int led_multi_control_init(struct device *dev);
+int led_multi_control_exit(struct device *dev);
+
+#endif	/* __LEDS_MULTI_H_INCLUDED */

drivers/leds/leds.h

@@ -50,4 +50,11 @@ void led_stop_software_blink(struct led_classdev *led_cdev);
 extern struct rw_semaphore leds_list_lock;
 extern struct list_head leds_list;
 
+#ifdef CONFIG_LEDS_TRIGGER_MULTI_CTRL
+void led_trigger_set_by_name(struct led_classdev *led_cdev, char *trig_name);
+#else
+static inline void led_trigger_set_by_name(struct led_classdev *led_cdev,
+					   char *trig_name) {}
+#endif
+
 #endif	/* __LEDS_H_INCLUDED */

drivers/leds/trigger/Kconfig

@@ -108,4 +108,10 @@ config LEDS_TRIGGER_CAMERA
 	  This enables direct flash/torch on/off by the driver, kernel space.
 	  If unsure, say Y.
 
+config LEDS_TRIGGER_MULTI_CTRL
+	tristate "LED Multi-Control Trigger"
+	depends on LEDS_TRIGGERS && LEDS_TRIGGER_DEFAULT_ON && LEDS_TRIGGER_TIMER && LEDS_TRIGGER_ONESHOT
+	help
+	  This allows userspace control all the leds at one time by ioctl operation.
+
 endif # LEDS_TRIGGERS

drivers/leds/trigger/Makefile

@@ -8,3 +8,4 @@ obj-$(CONFIG_LEDS_TRIGGER_CPU)		+= ledtrig-cpu.o
 obj-$(CONFIG_LEDS_TRIGGER_DEFAULT_ON)	+= ledtrig-default-on.o
 obj-$(CONFIG_LEDS_TRIGGER_TRANSIENT)	+= ledtrig-transient.o
 obj-$(CONFIG_LEDS_TRIGGER_CAMERA)	+= ledtrig-camera.o
+obj-$(CONFIG_LEDS_TRIGGER_MULTI_CTRL)	+= ledtrig-multi-control.o