drivers/power/pmu_battery.c

   1 /*
   2  * Battery class driver for Apple PMU
   3  *
   4  *      Copyright © 2006  David Woodhouse <dwmw2@infradead.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/err.h>
  14 #include <linux/power_supply.h>
  15 #include <linux/adb.h>
  16 #include <linux/pmu.h>
  17 #include <linux/slab.h>
  18
  19 static struct pmu_battery_dev {
  20         struct power_supply bat;
  21         struct pmu_battery_info *pbi;
  22         char name[16];
  23         int propval;
  24 } *pbats[PMU_MAX_BATTERIES];
  25
  26 #define to_pmu_battery_dev(x) container_of(x, struct pmu_battery_dev, bat)
  27
  28 /*********************************************************************
  29  *              Power
  30  *********************************************************************/
  31
  32 static int pmu_get_ac_prop(struct power_supply *psy,
  33                            enum power_supply_property psp,
  34                            union power_supply_propval *val)
  35 {
  36         switch (psp) {
  37         case POWER_SUPPLY_PROP_ONLINE:
  38                 val->intval = (!!(pmu_power_flags & PMU_PWR_AC_PRESENT)) ||
  39                               (pmu_battery_count == 0);
  40                 break;
  41         default:
  42                 return -EINVAL;
  43         }
  44
  45         return 0;
  46 }
  47
  48 static enum power_supply_property pmu_ac_props[] = {
  49         POWER_SUPPLY_PROP_ONLINE,
  50 };
  51
  52 static struct power_supply pmu_ac = {
  53         .name = "pmu-ac",
  54         .type = POWER_SUPPLY_TYPE_MAINS,
  55         .properties = pmu_ac_props,
  56         .num_properties = ARRAY_SIZE(pmu_ac_props),
  57         .get_property = pmu_get_ac_prop,
  58 };
  59
  60 /*********************************************************************
  61  *              Battery properties
  62  *********************************************************************/
  63
  64 static char *pmu_batt_types[] = {
  65         "Smart", "Comet", "Hooper", "Unknown"
  66 };
  67
  68 static char *pmu_bat_get_model_name(struct pmu_battery_info *pbi)
  69 {
  70         switch (pbi->flags & PMU_BATT_TYPE_MASK) {
  71         case PMU_BATT_TYPE_SMART:
  72                 return pmu_batt_types[0];
  73         case PMU_BATT_TYPE_COMET:
  74                 return pmu_batt_types[1];
  75         case PMU_BATT_TYPE_HOOPER:
  76                 return pmu_batt_types[2];
  77         default: break;
  78         }
  79         return pmu_batt_types[3];
  80 }
  81
  82 static int pmu_bat_get_property(struct power_supply *psy,
  83                                 enum power_supply_property psp,
  84                                 union power_supply_propval *val)
  85 {
  86         struct pmu_battery_dev *pbat = to_pmu_battery_dev(psy);
  87         struct pmu_battery_info *pbi = pbat->pbi;
  88
  89         switch (psp) {
  90         case POWER_SUPPLY_PROP_STATUS:
  91                 if (pbi->flags & PMU_BATT_CHARGING)
  92                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
  93                 else if (pmu_power_flags & PMU_PWR_AC_PRESENT)
  94                         val->intval = POWER_SUPPLY_STATUS_FULL;
  95                 else
  96                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
  97                 break;
  98         case POWER_SUPPLY_PROP_PRESENT:
  99                 val->intval = !!(pbi->flags & PMU_BATT_PRESENT);
 100                 break;
 101         case POWER_SUPPLY_PROP_MODEL_NAME:
 102                 val->strval = pmu_bat_get_model_name(pbi);
 103                 break;
 104         case POWER_SUPPLY_PROP_ENERGY_AVG:
 105                 val->intval = pbi->charge     * 1000; /* mWh -> µWh */
 106                 break;
 107         case POWER_SUPPLY_PROP_ENERGY_FULL:
 108                 val->intval = pbi->max_charge * 1000; /* mWh -> µWh */
 109                 break;
 110         case POWER_SUPPLY_PROP_CURRENT_AVG:
 111                 val->intval = pbi->amperage   * 1000; /* mA -> µA */
 112                 break;
 113         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
 114                 val->intval = pbi->voltage    * 1000; /* mV -> µV */
 115                 break;
 116         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
 117                 val->intval = pbi->time_remaining;
 118                 break;
 119         default:
 120                 return -EINVAL;
 121         }
 122
 123         return 0;
 124 }
 125
 126 static enum power_supply_property pmu_bat_props[] = {
 127         POWER_SUPPLY_PROP_STATUS,
 128         POWER_SUPPLY_PROP_PRESENT,
 129         POWER_SUPPLY_PROP_MODEL_NAME,
 130         POWER_SUPPLY_PROP_ENERGY_AVG,
 131         POWER_SUPPLY_PROP_ENERGY_FULL,
 132         POWER_SUPPLY_PROP_CURRENT_AVG,
 133         POWER_SUPPLY_PROP_VOLTAGE_AVG,
 134         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 135 };
 136
 137 /*********************************************************************
 138  *              Initialisation
 139  *********************************************************************/
 140
 141 static struct platform_device *bat_pdev;
 142
 143 static int __init pmu_bat_init(void)
 144 {
 145         int ret;
 146         int i;
 147
 148         bat_pdev = platform_device_register_simple("pmu-battery",
 149                                                    0, NULL, 0);
 150         if (IS_ERR(bat_pdev)) {
 151                 ret = PTR_ERR(bat_pdev);
 152                 goto pdev_register_failed;
 153         }
 154
 155         ret = power_supply_register(&bat_pdev->dev, &pmu_ac);
 156         if (ret)
 157                 goto ac_register_failed;
 158
 159         for (i = 0; i < pmu_battery_count; i++) {
 160                 struct pmu_battery_dev *pbat = kzalloc(sizeof(*pbat),
 161                                                        GFP_KERNEL);
 162                 if (!pbat)
 163                         break;
 164
 165                 sprintf(pbat->name, "PMU_battery_%d", i);
 166                 pbat->bat.name = pbat->name;
 167                 pbat->bat.properties = pmu_bat_props;
 168                 pbat->bat.num_properties = ARRAY_SIZE(pmu_bat_props);
 169                 pbat->bat.get_property = pmu_bat_get_property;
 170                 pbat->pbi = &pmu_batteries[i];
 171
 172                 ret = power_supply_register(&bat_pdev->dev, &pbat->bat);
 173                 if (ret) {
 174                         kfree(pbat);
 175                         goto battery_register_failed;
 176                 }
 177                 pbats[i] = pbat;
 178         }
 179
 180         goto success;
 181
 182 battery_register_failed:
 183         while (i--) {
 184                 if (!pbats[i])
 185                         continue;
 186                 power_supply_unregister(&pbats[i]->bat);
 187                 kfree(pbats[i]);
 188         }
 189         power_supply_unregister(&pmu_ac);
 190 ac_register_failed:
 191         platform_device_unregister(bat_pdev);
 192 pdev_register_failed:
 193 success:
 194         return ret;
 195 }
 196
 197 static void __exit pmu_bat_exit(void)
 198 {
 199         int i;
 200
 201         for (i = 0; i < PMU_MAX_BATTERIES; i++) {
 202                 if (!pbats[i])
 203                         continue;
 204                 power_supply_unregister(&pbats[i]->bat);
 205                 kfree(pbats[i]);
 206         }
 207         power_supply_unregister(&pmu_ac);
 208         platform_device_unregister(bat_pdev);
 209 }
 210
 211 module_init(pmu_bat_init);
 212 module_exit(pmu_bat_exit);
 213
 214 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 215 MODULE_LICENSE("GPL");
 216 MODULE_DESCRIPTION("PMU battery driver");