2146325df2
The leds-gpio blink_set() callback follows the same prototype as the main leds subsystem blink_set() one. The problem is that to stop blink, normally, a leds driver does it in the brightness_set() callback when asked to set a new fixed value. However, with leds-gpio, the platform has no hook to do so, as this later callback results in a standard GPIO manipulation. This changes the leds-gpio specific callback to take a new argument that indicates whether the LED should be blinking or not and in what state it should be set if not. We also update the dns323 platform which seems to be the only user of this so far. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
169 lines
4.5 KiB
C
169 lines
4.5 KiB
C
/*
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* Driver model for leds and led triggers
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*
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* Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
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* Copyright (C) 2005 Richard Purdie <rpurdie@openedhand.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#ifndef __LINUX_LEDS_H_INCLUDED
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#define __LINUX_LEDS_H_INCLUDED
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/rwsem.h>
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struct device;
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/*
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* LED Core
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*/
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enum led_brightness {
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LED_OFF = 0,
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LED_HALF = 127,
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LED_FULL = 255,
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};
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struct led_classdev {
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const char *name;
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int brightness;
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int max_brightness;
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int flags;
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/* Lower 16 bits reflect status */
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#define LED_SUSPENDED (1 << 0)
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/* Upper 16 bits reflect control information */
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#define LED_CORE_SUSPENDRESUME (1 << 16)
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/* Set LED brightness level */
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/* Must not sleep, use a workqueue if needed */
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void (*brightness_set)(struct led_classdev *led_cdev,
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enum led_brightness brightness);
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/* Get LED brightness level */
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enum led_brightness (*brightness_get)(struct led_classdev *led_cdev);
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/* Activate hardware accelerated blink, delays are in
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* miliseconds and if none is provided then a sensible default
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* should be chosen. The call can adjust the timings if it can't
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* match the values specified exactly. */
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int (*blink_set)(struct led_classdev *led_cdev,
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unsigned long *delay_on,
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unsigned long *delay_off);
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struct device *dev;
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struct list_head node; /* LED Device list */
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const char *default_trigger; /* Trigger to use */
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#ifdef CONFIG_LEDS_TRIGGERS
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/* Protects the trigger data below */
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struct rw_semaphore trigger_lock;
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struct led_trigger *trigger;
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struct list_head trig_list;
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void *trigger_data;
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#endif
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};
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extern int led_classdev_register(struct device *parent,
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struct led_classdev *led_cdev);
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extern void led_classdev_unregister(struct led_classdev *led_cdev);
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extern void led_classdev_suspend(struct led_classdev *led_cdev);
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extern void led_classdev_resume(struct led_classdev *led_cdev);
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/*
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* LED Triggers
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*/
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#ifdef CONFIG_LEDS_TRIGGERS
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#define TRIG_NAME_MAX 50
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struct led_trigger {
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/* Trigger Properties */
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const char *name;
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void (*activate)(struct led_classdev *led_cdev);
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void (*deactivate)(struct led_classdev *led_cdev);
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/* LEDs under control by this trigger (for simple triggers) */
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rwlock_t leddev_list_lock;
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struct list_head led_cdevs;
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/* Link to next registered trigger */
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struct list_head next_trig;
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};
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/* Registration functions for complex triggers */
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extern int led_trigger_register(struct led_trigger *trigger);
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extern void led_trigger_unregister(struct led_trigger *trigger);
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/* Registration functions for simple triggers */
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#define DEFINE_LED_TRIGGER(x) static struct led_trigger *x;
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#define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x;
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extern void led_trigger_register_simple(const char *name,
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struct led_trigger **trigger);
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extern void led_trigger_unregister_simple(struct led_trigger *trigger);
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extern void led_trigger_event(struct led_trigger *trigger,
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enum led_brightness event);
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#else
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/* Triggers aren't active - null macros */
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#define DEFINE_LED_TRIGGER(x)
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#define DEFINE_LED_TRIGGER_GLOBAL(x)
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#define led_trigger_register_simple(x, y) do {} while(0)
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#define led_trigger_unregister_simple(x) do {} while(0)
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#define led_trigger_event(x, y) do {} while(0)
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#endif
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/* Trigger specific functions */
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#ifdef CONFIG_LEDS_TRIGGER_IDE_DISK
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extern void ledtrig_ide_activity(void);
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#else
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#define ledtrig_ide_activity() do {} while(0)
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#endif
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/*
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* Generic LED platform data for describing LED names and default triggers.
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*/
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struct led_info {
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const char *name;
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const char *default_trigger;
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int flags;
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};
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struct led_platform_data {
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int num_leds;
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struct led_info *leds;
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};
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/* For the leds-gpio driver */
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struct gpio_led {
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const char *name;
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const char *default_trigger;
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unsigned gpio;
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unsigned active_low : 1;
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unsigned retain_state_suspended : 1;
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unsigned default_state : 2;
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/* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */
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};
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#define LEDS_GPIO_DEFSTATE_OFF 0
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#define LEDS_GPIO_DEFSTATE_ON 1
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#define LEDS_GPIO_DEFSTATE_KEEP 2
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struct gpio_led_platform_data {
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int num_leds;
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struct gpio_led *leds;
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#define GPIO_LED_NO_BLINK_LOW 0 /* No blink GPIO state low */
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#define GPIO_LED_NO_BLINK_HIGH 1 /* No blink GPIO state high */
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#define GPIO_LED_BLINK 2 /* Plase, blink */
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int (*gpio_blink_set)(unsigned gpio, int state,
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unsigned long *delay_on,
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unsigned long *delay_off);
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};
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#endif /* __LINUX_LEDS_H_INCLUDED */
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