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![Uwe Kleine-König](/assets/img/avatar_default.png)
This function makes a deep copy of the platform data to allow it to live in init memory. For a kernel that supports several machines and so includes the definition for several leds-gpio devices this saves quite some memory because all but one definition can be free'd after boot. As the function is used by arch code it must be builtin and so cannot go into leds-gpio.c. [akpm@linux-foundation.org: s/CONFIG_LED_REGISTER_GPIO/CONFIG_LEDS_REGISTER_GPIO/] Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Cc: Russell King <rmk@arm.linux.org.uk> Acked-by: Richard Purdie <richard.purdie@linuxfoundation.org> Cc: Fabio Estevam <fabio.estevam@freescale.com> Cc: Sascha Hauer <s.hauer@pengutronix.de> Tested-by: H Hartley Sweeten <hartleys@visionengravers.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
213 lines
6.1 KiB
C
213 lines
6.1 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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#include <linux/timer.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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/*
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* Activate hardware accelerated blink, delays are in milliseconds
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* and if both are zero then a sensible default should be chosen.
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* The call should adjust the timings in that case and if it can't
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* match the values specified exactly.
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* Deactivate blinking again when the brightness is set to a fixed
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* value via the brightness_set() callback.
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*/
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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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unsigned long blink_delay_on, blink_delay_off;
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struct timer_list blink_timer;
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int blink_brightness;
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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_blink_set - set blinking with software fallback
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* @led_cdev: the LED to start blinking
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* @delay_on: the time it should be on (in ms)
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* @delay_off: the time it should ble off (in ms)
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*
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* This function makes the LED blink, attempting to use the
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* hardware acceleration if possible, but falling back to
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* software blinking if there is no hardware blinking or if
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* the LED refuses the passed values.
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*
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* Note that if software blinking is active, simply calling
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* led_cdev->brightness_set() will not stop the blinking,
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* use led_classdev_brightness_set() instead.
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*/
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extern void led_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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/**
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* led_brightness_set - set LED brightness
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* @led_cdev: the LED to set
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* @brightness: the brightness to set it to
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*
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* Set an LED's brightness, and, if necessary, cancel the
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* software blink timer that implements blinking when the
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* hardware doesn't.
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*/
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extern void led_brightness_set(struct led_classdev *led_cdev,
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enum led_brightness brightness);
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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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extern void led_trigger_blink(struct led_trigger *trigger,
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unsigned long *delay_on,
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unsigned long *delay_off);
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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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const 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 /* Please, 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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struct platform_device *gpio_led_register_device(
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int id, const struct gpio_led_platform_data *pdata);
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#endif /* __LINUX_LEDS_H_INCLUDED */
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