drivers/power/power_supply_leds.c

   1 /*
   2  *  LEDs triggers for power supply class
   3  *
   4  *  Copyright © 2007  Anton Vorontsov <cbou@mail.ru>
   5  *  Copyright © 2004  Szabolcs Gyurko
   6  *  Copyright © 2003  Ian Molton <spyro@f2s.com>
   7  *
   8  *  Modified: 2004, Oct     Szabolcs Gyurko
   9  *
  10  *  You may use this code as per GPL version 2
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/device.h>
  15 #include <linux/power_supply.h>
  16 #include <linux/slab.h>
  17
  18 #include "power_supply.h"
  19
  20 /* Battery specific LEDs triggers. */
  21
  22 static void power_supply_update_bat_leds(struct power_supply *psy)
  23 {
  24         union power_supply_propval status;
  25         unsigned long delay_on = 0;
  26         unsigned long delay_off = 0;
  27
  28         if (power_supply_get_property(psy, POWER_SUPPLY_PROP_STATUS, &status))
  29                 return;
  30
  31         dev_dbg(&psy->dev, "%s %d\n", __func__, status.intval);
  32
  33         switch (status.intval) {
  34         case POWER_SUPPLY_STATUS_FULL:
  35                 led_trigger_event(psy->charging_full_trig, LED_FULL);
  36                 led_trigger_event(psy->charging_trig, LED_OFF);
  37                 led_trigger_event(psy->full_trig, LED_FULL);
  38                 led_trigger_event(psy->charging_blink_full_solid_trig,
  39                         LED_FULL);
  40                 break;
  41         case POWER_SUPPLY_STATUS_CHARGING:
  42                 led_trigger_event(psy->charging_full_trig, LED_FULL);
  43                 led_trigger_event(psy->charging_trig, LED_FULL);
  44                 led_trigger_event(psy->full_trig, LED_OFF);
  45                 led_trigger_blink(psy->charging_blink_full_solid_trig,
  46                         &delay_on, &delay_off);
  47                 break;
  48         default:
  49                 led_trigger_event(psy->charging_full_trig, LED_OFF);
  50                 led_trigger_event(psy->charging_trig, LED_OFF);
  51                 led_trigger_event(psy->full_trig, LED_OFF);
  52                 led_trigger_event(psy->charging_blink_full_solid_trig,
  53                         LED_OFF);
  54                 break;
  55         }
  56 }
  57
  58 static int power_supply_create_bat_triggers(struct power_supply *psy)
  59 {
  60         psy->charging_full_trig_name = kasprintf(GFP_KERNEL,
  61                                         "%s-charging-or-full", psy->desc->name);
  62         if (!psy->charging_full_trig_name)
  63                 goto charging_full_failed;
  64
  65         psy->charging_trig_name = kasprintf(GFP_KERNEL,
  66                                         "%s-charging", psy->desc->name);
  67         if (!psy->charging_trig_name)
  68                 goto charging_failed;
  69
  70         psy->full_trig_name = kasprintf(GFP_KERNEL, "%s-full", psy->desc->name);
  71         if (!psy->full_trig_name)
  72                 goto full_failed;
  73
  74         psy->charging_blink_full_solid_trig_name = kasprintf(GFP_KERNEL,
  75                 "%s-charging-blink-full-solid", psy->desc->name);
  76         if (!psy->charging_blink_full_solid_trig_name)
  77                 goto charging_blink_full_solid_failed;
  78
  79         led_trigger_register_simple(psy->charging_full_trig_name,
  80                                     &psy->charging_full_trig);
  81         led_trigger_register_simple(psy->charging_trig_name,
  82                                     &psy->charging_trig);
  83         led_trigger_register_simple(psy->full_trig_name,
  84                                     &psy->full_trig);
  85         led_trigger_register_simple(psy->charging_blink_full_solid_trig_name,
  86                                     &psy->charging_blink_full_solid_trig);
  87
  88         return 0;
  89
  90 charging_blink_full_solid_failed:
  91         kfree(psy->full_trig_name);
  92 full_failed:
  93         kfree(psy->charging_trig_name);
  94 charging_failed:
  95         kfree(psy->charging_full_trig_name);
  96 charging_full_failed:
  97         return -ENOMEM;
  98 }
  99
 100 static void power_supply_remove_bat_triggers(struct power_supply *psy)
 101 {
 102         led_trigger_unregister_simple(psy->charging_full_trig);
 103         led_trigger_unregister_simple(psy->charging_trig);
 104         led_trigger_unregister_simple(psy->full_trig);
 105         led_trigger_unregister_simple(psy->charging_blink_full_solid_trig);
 106         kfree(psy->charging_blink_full_solid_trig_name);
 107         kfree(psy->full_trig_name);
 108         kfree(psy->charging_trig_name);
 109         kfree(psy->charging_full_trig_name);
 110 }
 111
 112 /* Generated power specific LEDs triggers. */
 113
 114 static void power_supply_update_gen_leds(struct power_supply *psy)
 115 {
 116         union power_supply_propval online;
 117
 118         if (power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE, &online))
 119                 return;
 120
 121         dev_dbg(&psy->dev, "%s %d\n", __func__, online.intval);
 122
 123         if (online.intval)
 124                 led_trigger_event(psy->online_trig, LED_FULL);
 125         else
 126                 led_trigger_event(psy->online_trig, LED_OFF);
 127 }
 128
 129 static int power_supply_create_gen_triggers(struct power_supply *psy)
 130 {
 131         psy->online_trig_name = kasprintf(GFP_KERNEL, "%s-online",
 132                                           psy->desc->name);
 133         if (!psy->online_trig_name)
 134                 return -ENOMEM;
 135
 136         led_trigger_register_simple(psy->online_trig_name, &psy->online_trig);
 137
 138         return 0;
 139 }
 140
 141 static void power_supply_remove_gen_triggers(struct power_supply *psy)
 142 {
 143         led_trigger_unregister_simple(psy->online_trig);
 144         kfree(psy->online_trig_name);
 145 }
 146
 147 /* Choice what triggers to create&update. */
 148
 149 void power_supply_update_leds(struct power_supply *psy)
 150 {
 151         if (psy->desc->type == POWER_SUPPLY_TYPE_BATTERY)
 152                 power_supply_update_bat_leds(psy);
 153         else
 154                 power_supply_update_gen_leds(psy);
 155 }
 156
 157 int power_supply_create_triggers(struct power_supply *psy)
 158 {
 159         if (psy->desc->type == POWER_SUPPLY_TYPE_BATTERY)
 160                 return power_supply_create_bat_triggers(psy);
 161         return power_supply_create_gen_triggers(psy);
 162 }
 163
 164 void power_supply_remove_triggers(struct power_supply *psy)
 165 {
 166         if (psy->desc->type == POWER_SUPPLY_TYPE_BATTERY)
 167                 power_supply_remove_bat_triggers(psy);
 168         else
 169                 power_supply_remove_gen_triggers(psy);
 170 }