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 #include <linux/slab.h>
  16
  17 #include "power_supply.h"
  18
  19 /* Battery specific LEDs triggers. */
  20
  21 static void power_supply_update_bat_leds(struct power_supply *psy)
  22 {
  23         union power_supply_propval status;
  24         unsigned long delay_on = 0;
  25         unsigned long delay_off = 0;
  26
  27         if (psy->get_property(psy, POWER_SUPPLY_PROP_STATUS, &status))
  28                 return;
  29
  30         dev_dbg(psy->dev, "%s %d\n", __func__, status.intval);
  31
  32         switch (status.intval) {
  33         case POWER_SUPPLY_STATUS_FULL:
  34                 led_trigger_event(psy->charging_full_trig, LED_FULL);
  35                 led_trigger_event(psy->charging_trig, LED_OFF);
  36                 led_trigger_event(psy->full_trig, LED_FULL);
  37                 led_trigger_event(psy->charging_blink_full_solid_trig,
  38                         LED_FULL);
  39                 break;
  40         case POWER_SUPPLY_STATUS_CHARGING:
  41                 led_trigger_event(psy->charging_full_trig, LED_FULL);
  42                 led_trigger_event(psy->charging_trig, LED_FULL);
  43                 led_trigger_event(psy->full_trig, LED_OFF);
  44                 led_trigger_blink(psy->charging_blink_full_solid_trig,
  45                         &delay_on, &delay_off);
  46                 break;
  47         default:
  48                 led_trigger_event(psy->charging_full_trig, LED_OFF);
  49                 led_trigger_event(psy->charging_trig, LED_OFF);
  50                 led_trigger_event(psy->full_trig, LED_OFF);
  51                 led_trigger_event(psy->charging_blink_full_solid_trig,
  52                         LED_OFF);
  53                 break;
  54         }
  55 }
  56
  57 static int power_supply_create_bat_triggers(struct power_supply *psy)
  58 {
  59         int rc = 0;
  60
  61         psy->charging_full_trig_name = kasprintf(GFP_KERNEL,
  62                                         "%s-charging-or-full", psy->name);
  63         if (!psy->charging_full_trig_name)
  64                 goto charging_full_failed;
  65
  66         psy->charging_trig_name = kasprintf(GFP_KERNEL,
  67                                         "%s-charging", psy->name);
  68         if (!psy->charging_trig_name)
  69                 goto charging_failed;
  70
  71         psy->full_trig_name = kasprintf(GFP_KERNEL, "%s-full", psy->name);
  72         if (!psy->full_trig_name)
  73                 goto full_failed;
  74
  75         psy->charging_blink_full_solid_trig_name = kasprintf(GFP_KERNEL,
  76                 "%s-charging-blink-full-solid", psy->name);
  77         if (!psy->charging_blink_full_solid_trig_name)
  78                 goto charging_blink_full_solid_failed;
  79
  80         led_trigger_register_simple(psy->charging_full_trig_name,
  81                                     &psy->charging_full_trig);
  82         led_trigger_register_simple(psy->charging_trig_name,
  83                                     &psy->charging_trig);
  84         led_trigger_register_simple(psy->full_trig_name,
  85                                     &psy->full_trig);
  86         led_trigger_register_simple(psy->charging_blink_full_solid_trig_name,
  87                                     &psy->charging_blink_full_solid_trig);
  88
  89         goto success;
  90
  91 charging_blink_full_solid_failed:
  92         kfree(psy->full_trig_name);
  93 full_failed:
  94         kfree(psy->charging_trig_name);
  95 charging_failed:
  96         kfree(psy->charging_full_trig_name);
  97 charging_full_failed:
  98         rc = -ENOMEM;
  99 success:
 100         return rc;
 101 }
 102
 103 static void power_supply_remove_bat_triggers(struct power_supply *psy)
 104 {
 105         led_trigger_unregister_simple(psy->charging_full_trig);
 106         led_trigger_unregister_simple(psy->charging_trig);
 107         led_trigger_unregister_simple(psy->full_trig);
 108         led_trigger_unregister_simple(psy->charging_blink_full_solid_trig);
 109         kfree(psy->charging_blink_full_solid_trig_name);
 110         kfree(psy->full_trig_name);
 111         kfree(psy->charging_trig_name);
 112         kfree(psy->charging_full_trig_name);
 113 }
 114
 115 /* Generated power specific LEDs triggers. */
 116
 117 static void power_supply_update_gen_leds(struct power_supply *psy)
 118 {
 119         union power_supply_propval online;
 120
 121         if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &online))
 122                 return;
 123
 124         dev_dbg(psy->dev, "%s %d\n", __func__, online.intval);
 125
 126         if (online.intval)
 127                 led_trigger_event(psy->online_trig, LED_FULL);
 128         else
 129                 led_trigger_event(psy->online_trig, LED_OFF);
 130 }
 131
 132 static int power_supply_create_gen_triggers(struct power_supply *psy)
 133 {
 134         int rc = 0;
 135
 136         psy->online_trig_name = kasprintf(GFP_KERNEL, "%s-online", psy->name);
 137         if (!psy->online_trig_name)
 138                 goto online_failed;
 139
 140         led_trigger_register_simple(psy->online_trig_name, &psy->online_trig);
 141
 142         goto success;
 143
 144 online_failed:
 145         rc = -ENOMEM;
 146 success:
 147         return rc;
 148 }
 149
 150 static void power_supply_remove_gen_triggers(struct power_supply *psy)
 151 {
 152         led_trigger_unregister_simple(psy->online_trig);
 153         kfree(psy->online_trig_name);
 154 }
 155
 156 /* Choice what triggers to create&update. */
 157
 158 void power_supply_update_leds(struct power_supply *psy)
 159 {
 160         if (psy->type == POWER_SUPPLY_TYPE_BATTERY)
 161                 power_supply_update_bat_leds(psy);
 162         else
 163                 power_supply_update_gen_leds(psy);
 164 }
 165
 166 int power_supply_create_triggers(struct power_supply *psy)
 167 {
 168         if (psy->type == POWER_SUPPLY_TYPE_BATTERY)
 169                 return power_supply_create_bat_triggers(psy);
 170         return power_supply_create_gen_triggers(psy);
 171 }
 172
 173 void power_supply_remove_triggers(struct power_supply *psy)
 174 {
 175         if (psy->type == POWER_SUPPLY_TYPE_BATTERY)
 176                 power_supply_remove_bat_triggers(psy);
 177         else
 178                 power_supply_remove_gen_triggers(psy);
 179 }