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/power_supply.h>
  15
  16 #include "power_supply.h"
  17
  18 /* Battery specific LEDs triggers. */
  19
  20 static void power_supply_update_bat_leds(struct power_supply *psy)
  21 {
  22         union power_supply_propval status;
  23
  24         if (psy->get_property(psy, POWER_SUPPLY_PROP_STATUS, &status))
  25                 return;
  26
  27         dev_dbg(psy->dev, "%s %d\n", __FUNCTION__, status.intval);
  28
  29         switch (status.intval) {
  30         case POWER_SUPPLY_STATUS_FULL:
  31                 led_trigger_event(psy->charging_full_trig, LED_FULL);
  32                 led_trigger_event(psy->charging_trig, LED_OFF);
  33                 led_trigger_event(psy->full_trig, LED_FULL);
  34                 break;
  35         case POWER_SUPPLY_STATUS_CHARGING:
  36                 led_trigger_event(psy->charging_full_trig, LED_FULL);
  37                 led_trigger_event(psy->charging_trig, LED_FULL);
  38                 led_trigger_event(psy->full_trig, LED_OFF);
  39                 break;
  40         default:
  41                 led_trigger_event(psy->charging_full_trig, LED_OFF);
  42                 led_trigger_event(psy->charging_trig, LED_OFF);
  43                 led_trigger_event(psy->full_trig, LED_OFF);
  44                 break;
  45         }
  46 }
  47
  48 static int power_supply_create_bat_triggers(struct power_supply *psy)
  49 {
  50         int rc = 0;
  51
  52         psy->charging_full_trig_name = kasprintf(GFP_KERNEL,
  53                                         "%s-charging-or-full", psy->name);
  54         if (!psy->charging_full_trig_name)
  55                 goto charging_full_failed;
  56
  57         psy->charging_trig_name = kasprintf(GFP_KERNEL,
  58                                         "%s-charging", psy->name);
  59         if (!psy->charging_trig_name)
  60                 goto charging_failed;
  61
  62         psy->full_trig_name = kasprintf(GFP_KERNEL, "%s-full", psy->name);
  63         if (!psy->full_trig_name)
  64                 goto full_failed;
  65
  66         led_trigger_register_simple(psy->charging_full_trig_name,
  67                                     &psy->charging_full_trig);
  68         led_trigger_register_simple(psy->charging_trig_name,
  69                                     &psy->charging_trig);
  70         led_trigger_register_simple(psy->full_trig_name,
  71                                     &psy->full_trig);
  72
  73         goto success;
  74
  75 full_failed:
  76         kfree(psy->charging_trig_name);
  77 charging_failed:
  78         kfree(psy->charging_full_trig_name);
  79 charging_full_failed:
  80         rc = -ENOMEM;
  81 success:
  82         return rc;
  83 }
  84
  85 static void power_supply_remove_bat_triggers(struct power_supply *psy)
  86 {
  87         led_trigger_unregister_simple(psy->charging_full_trig);
  88         led_trigger_unregister_simple(psy->charging_trig);
  89         led_trigger_unregister_simple(psy->full_trig);
  90         kfree(psy->full_trig_name);
  91         kfree(psy->charging_trig_name);
  92         kfree(psy->charging_full_trig_name);
  93 }
  94
  95 /* Generated power specific LEDs triggers. */
  96
  97 static void power_supply_update_gen_leds(struct power_supply *psy)
  98 {
  99         union power_supply_propval online;
 100
 101         if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &online))
 102                 return;
 103
 104         dev_dbg(psy->dev, "%s %d\n", __FUNCTION__, online.intval);
 105
 106         if (online.intval)
 107                 led_trigger_event(psy->online_trig, LED_FULL);
 108         else
 109                 led_trigger_event(psy->online_trig, LED_OFF);
 110 }
 111
 112 static int power_supply_create_gen_triggers(struct power_supply *psy)
 113 {
 114         int rc = 0;
 115
 116         psy->online_trig_name = kasprintf(GFP_KERNEL, "%s-online", psy->name);
 117         if (!psy->online_trig_name)
 118                 goto online_failed;
 119
 120         led_trigger_register_simple(psy->online_trig_name, &psy->online_trig);
 121
 122         goto success;
 123
 124 online_failed:
 125         rc = -ENOMEM;
 126 success:
 127         return rc;
 128 }
 129
 130 static void power_supply_remove_gen_triggers(struct power_supply *psy)
 131 {
 132         led_trigger_unregister_simple(psy->online_trig);
 133         kfree(psy->online_trig_name);
 134 }
 135
 136 /* Choice what triggers to create&update. */
 137
 138 void power_supply_update_leds(struct power_supply *psy)
 139 {
 140         if (psy->type == POWER_SUPPLY_TYPE_BATTERY)
 141                 power_supply_update_bat_leds(psy);
 142         else
 143                 power_supply_update_gen_leds(psy);
 144 }
 145
 146 int power_supply_create_triggers(struct power_supply *psy)
 147 {
 148         if (psy->type == POWER_SUPPLY_TYPE_BATTERY)
 149                 return power_supply_create_bat_triggers(psy);
 150         return power_supply_create_gen_triggers(psy);
 151 }
 152
 153 void power_supply_remove_triggers(struct power_supply *psy)
 154 {
 155         if (psy->type == POWER_SUPPLY_TYPE_BATTERY)
 156                 power_supply_remove_bat_triggers(psy);
 157         else
 158                 power_supply_remove_gen_triggers(psy);
 159 }