include/linux/leds.h

   1 /*
   2  * Driver model for leds and led triggers
   3  *
   4  * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
   5  * Copyright (C) 2005 Richard Purdie <rpurdie@openedhand.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  */
  12 #ifndef __LINUX_LEDS_H_INCLUDED
  13 #define __LINUX_LEDS_H_INCLUDED
  14
  15 #include <linux/list.h>
  16 #include <linux/spinlock.h>
  17 #include <linux/rwsem.h>
  18 #include <linux/timer.h>
  19 #include <linux/workqueue.h>
  20
  21 struct device;
  22 /*
  23  * LED Core
  24  */
  25
  26 enum led_brightness {
  27         LED_OFF         = 0,
  28         LED_HALF        = 127,
  29         LED_FULL        = 255,
  30 };
  31
  32 struct led_classdev {
  33         const char              *name;
  34         int                      brightness;
  35         int                      max_brightness;
  36         int                      flags;
  37
  38         /* Lower 16 bits reflect status */
  39 #define LED_SUSPENDED           (1 << 0)
  40         /* Upper 16 bits reflect control information */
  41 #define LED_CORE_SUSPENDRESUME  (1 << 16)
  42 #define LED_BLINK_ONESHOT       (1 << 17)
  43 #define LED_BLINK_ONESHOT_STOP  (1 << 18)
  44 #define LED_BLINK_INVERT        (1 << 19)
  45
  46         /* Set LED brightness level */
  47         /* Must not sleep, use a workqueue if needed */
  48         void            (*brightness_set)(struct led_classdev *led_cdev,
  49                                           enum led_brightness brightness);
  50         /* Get LED brightness level */
  51         enum led_brightness (*brightness_get)(struct led_classdev *led_cdev);
  52
  53         /*
  54          * Activate hardware accelerated blink, delays are in milliseconds
  55          * and if both are zero then a sensible default should be chosen.
  56          * The call should adjust the timings in that case and if it can't
  57          * match the values specified exactly.
  58          * Deactivate blinking again when the brightness is set to a fixed
  59          * value via the brightness_set() callback.
  60          */
  61         int             (*blink_set)(struct led_classdev *led_cdev,
  62                                      unsigned long *delay_on,
  63                                      unsigned long *delay_off);
  64
  65         struct device           *dev;
  66         struct list_head         node;                  /* LED Device list */
  67         const char              *default_trigger;       /* Trigger to use */
  68
  69         unsigned long            blink_delay_on, blink_delay_off;
  70         struct timer_list        blink_timer;
  71         int                      blink_brightness;
  72
  73         struct work_struct      set_brightness_work;
  74         int                     delayed_set_value;
  75
  76 #ifdef CONFIG_LEDS_TRIGGERS
  77         /* Protects the trigger data below */
  78         struct rw_semaphore      trigger_lock;
  79
  80         struct led_trigger      *trigger;
  81         struct list_head         trig_list;
  82         void                    *trigger_data;
  83         /* true if activated - deactivate routine uses it to do cleanup */
  84         bool                    activated;
  85 #endif
  86 };
  87
  88 extern int led_classdev_register(struct device *parent,
  89                                  struct led_classdev *led_cdev);
  90 extern void led_classdev_unregister(struct led_classdev *led_cdev);
  91 extern void led_classdev_suspend(struct led_classdev *led_cdev);
  92 extern void led_classdev_resume(struct led_classdev *led_cdev);
  93
  94 /**
  95  * led_blink_set - set blinking with software fallback
  96  * @led_cdev: the LED to start blinking
  97  * @delay_on: the time it should be on (in ms)
  98  * @delay_off: the time it should ble off (in ms)
  99  *
 100  * This function makes the LED blink, attempting to use the
 101  * hardware acceleration if possible, but falling back to
 102  * software blinking if there is no hardware blinking or if
 103  * the LED refuses the passed values.
 104  *
 105  * Note that if software blinking is active, simply calling
 106  * led_cdev->brightness_set() will not stop the blinking,
 107  * use led_classdev_brightness_set() instead.
 108  */
 109 extern void led_blink_set(struct led_classdev *led_cdev,
 110                           unsigned long *delay_on,
 111                           unsigned long *delay_off);
 112 /**
 113  * led_blink_set_oneshot - do a oneshot software blink
 114  * @led_cdev: the LED to start blinking
 115  * @delay_on: the time it should be on (in ms)
 116  * @delay_off: the time it should ble off (in ms)
 117  * @invert: blink off, then on, leaving the led on
 118  *
 119  * This function makes the LED blink one time for delay_on +
 120  * delay_off time, ignoring the request if another one-shot
 121  * blink is already in progress.
 122  *
 123  * If invert is set, led blinks for delay_off first, then for
 124  * delay_on and leave the led on after the on-off cycle.
 125  */
 126 extern void led_blink_set_oneshot(struct led_classdev *led_cdev,
 127                                   unsigned long *delay_on,
 128                                   unsigned long *delay_off,
 129                                   int invert);
 130 /**
 131  * led_set_brightness - set LED brightness
 132  * @led_cdev: the LED to set
 133  * @brightness: the brightness to set it to
 134  *
 135  * Set an LED's brightness, and, if necessary, cancel the
 136  * software blink timer that implements blinking when the
 137  * hardware doesn't.
 138  */
 139 extern void led_set_brightness(struct led_classdev *led_cdev,
 140                                enum led_brightness brightness);
 141
 142 /*
 143  * LED Triggers
 144  */
 145 /* Registration functions for simple triggers */
 146 #define DEFINE_LED_TRIGGER(x)           static struct led_trigger *x;
 147 #define DEFINE_LED_TRIGGER_GLOBAL(x)    struct led_trigger *x;
 148
 149 #ifdef CONFIG_LEDS_TRIGGERS
 150
 151 #define TRIG_NAME_MAX 50
 152
 153 struct led_trigger {
 154         /* Trigger Properties */
 155         const char       *name;
 156         void            (*activate)(struct led_classdev *led_cdev);
 157         void            (*deactivate)(struct led_classdev *led_cdev);
 158
 159         /* LEDs under control by this trigger (for simple triggers) */
 160         rwlock_t          leddev_list_lock;
 161         struct list_head  led_cdevs;
 162
 163         /* Link to next registered trigger */
 164         struct list_head  next_trig;
 165 };
 166
 167 /* Registration functions for complex triggers */
 168 extern int led_trigger_register(struct led_trigger *trigger);
 169 extern void led_trigger_unregister(struct led_trigger *trigger);
 170
 171 extern void led_trigger_register_simple(const char *name,
 172                                 struct led_trigger **trigger);
 173 extern void led_trigger_unregister_simple(struct led_trigger *trigger);
 174 extern void led_trigger_event(struct led_trigger *trigger,
 175                                 enum led_brightness event);
 176 extern void led_trigger_blink(struct led_trigger *trigger,
 177                               unsigned long *delay_on,
 178                               unsigned long *delay_off);
 179 extern void led_trigger_blink_oneshot(struct led_trigger *trigger,
 180                                       unsigned long *delay_on,
 181                                       unsigned long *delay_off,
 182                                       int invert);
 183 /**
 184  * led_trigger_rename_static - rename a trigger
 185  * @name: the new trigger name
 186  * @trig: the LED trigger to rename
 187  *
 188  * Change a LED trigger name by copying the string passed in
 189  * name into current trigger name, which MUST be large
 190  * enough for the new string.
 191  *
 192  * Note that name must NOT point to the same string used
 193  * during LED registration, as that could lead to races.
 194  *
 195  * This is meant to be used on triggers with statically
 196  * allocated name.
 197  */
 198 extern void led_trigger_rename_static(const char *name,
 199                                       struct led_trigger *trig);
 200
 201 #else
 202
 203 /* Trigger has no members */
 204 struct led_trigger {};
 205
 206 /* Trigger inline empty functions */
 207 static inline void led_trigger_register_simple(const char *name,
 208                                         struct led_trigger **trigger) {}
 209 static inline void led_trigger_unregister_simple(struct led_trigger *trigger) {}
 210 static inline void led_trigger_event(struct led_trigger *trigger,
 211                                 enum led_brightness event) {}
 212 #endif /* CONFIG_LEDS_TRIGGERS */
 213
 214 /* Trigger specific functions */
 215 #ifdef CONFIG_LEDS_TRIGGER_IDE_DISK
 216 extern void ledtrig_ide_activity(void);
 217 #else
 218 static inline void ledtrig_ide_activity(void) {}
 219 #endif
 220
 221 #if defined(CONFIG_LEDS_TRIGGER_CAMERA) || defined(CONFIG_LEDS_TRIGGER_CAMERA_MODULE)
 222 extern void ledtrig_flash_ctrl(bool on);
 223 extern void ledtrig_torch_ctrl(bool on);
 224 #else
 225 static inline void ledtrig_flash_ctrl(bool on) {}
 226 static inline void ledtrig_torch_ctrl(bool on) {}
 227 #endif
 228
 229 /*
 230  * Generic LED platform data for describing LED names and default triggers.
 231  */
 232 struct led_info {
 233         const char      *name;
 234         const char      *default_trigger;
 235         int             flags;
 236 };
 237
 238 struct led_platform_data {
 239         int             num_leds;
 240         struct led_info *leds;
 241 };
 242
 243 /* For the leds-gpio driver */
 244 struct gpio_led {
 245         const char *name;
 246         const char *default_trigger;
 247         unsigned        gpio;
 248         unsigned        active_low : 1;
 249         unsigned        retain_state_suspended : 1;
 250         unsigned        default_state : 2;
 251         /* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */
 252 };
 253 #define LEDS_GPIO_DEFSTATE_OFF          0
 254 #define LEDS_GPIO_DEFSTATE_ON           1
 255 #define LEDS_GPIO_DEFSTATE_KEEP         2
 256
 257 struct gpio_led_platform_data {
 258         int             num_leds;
 259         const struct gpio_led *leds;
 260
 261 #define GPIO_LED_NO_BLINK_LOW   0       /* No blink GPIO state low */
 262 #define GPIO_LED_NO_BLINK_HIGH  1       /* No blink GPIO state high */
 263 #define GPIO_LED_BLINK          2       /* Please, blink */
 264         int             (*gpio_blink_set)(unsigned gpio, int state,
 265                                         unsigned long *delay_on,
 266                                         unsigned long *delay_off);
 267 };
 268
 269 struct platform_device *gpio_led_register_device(
 270                 int id, const struct gpio_led_platform_data *pdata);
 271
 272 enum cpu_led_event {
 273         CPU_LED_IDLE_START,     /* CPU enters idle */
 274         CPU_LED_IDLE_END,       /* CPU idle ends */
 275         CPU_LED_START,          /* Machine starts, especially resume */
 276         CPU_LED_STOP,           /* Machine stops, especially suspend */
 277         CPU_LED_HALTED,         /* Machine shutdown */
 278 };
 279 #ifdef CONFIG_LEDS_TRIGGER_CPU
 280 extern void ledtrig_cpu(enum cpu_led_event evt);
 281 #else
 282 static inline void ledtrig_cpu(enum cpu_led_event evt)
 283 {
 284         return;
 285 }
 286 #endif
 287
 288 #endif          /* __LINUX_LEDS_H_INCLUDED */
 289
 290 /*****************************************************************
 291  * [MTK]The patch increases LED brightness level adjustment by adding
 292  *
 293  *
 294  *
 295  */
 296 #define LED_INCREASE_LED_LEVEL_MTKPATCH
 297 #ifdef LED_INCREASE_LED_LEVEL_MTKPATCH
 298 #define LED_RESERVEBIT_SHIFT 16
 299 #define LED_RESERVEBIT_PATTERN 1
 300 #endif