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 power_supply_desc bat_desc;
  22         struct pmu_battery_info *pbi;
  23         char name[16];
  24         int propval;
  25 } *pbats[PMU_MAX_BATTERIES];
  26
  27 #define to_pmu_battery_dev(x) power_supply_get_drvdata(x)
  28
  29 /*********************************************************************
  30  *              Power
  31  *********************************************************************/
  32
  33 static int pmu_get_ac_prop(struct power_supply *psy,
  34                            enum power_supply_property psp,
  35                            union power_supply_propval *val)
  36 {
  37         switch (psp) {
  38         case POWER_SUPPLY_PROP_ONLINE:
  39                 val->intval = (!!(pmu_power_flags & PMU_PWR_AC_PRESENT)) ||
  40                               (pmu_battery_count == 0);
  41                 break;
  42         default:
  43                 return -EINVAL;
  44         }
  45
  46         return 0;
  47 }
  48
  49 static enum power_supply_property pmu_ac_props[] = {
  50         POWER_SUPPLY_PROP_ONLINE,
  51 };
  52
  53 static const struct power_supply_desc pmu_ac_desc = {
  54         .name = "pmu-ac",
  55         .type = POWER_SUPPLY_TYPE_MAINS,
  56         .properties = pmu_ac_props,
  57         .num_properties = ARRAY_SIZE(pmu_ac_props),
  58         .get_property = pmu_get_ac_prop,
  59 };
  60
  61 static struct power_supply *pmu_ac;
  62
  63 /*********************************************************************
  64  *              Battery properties
  65  *********************************************************************/
  66
  67 static char *pmu_batt_types[] = {
  68         "Smart", "Comet", "Hooper", "Unknown"
  69 };
  70
  71 static char *pmu_bat_get_model_name(struct pmu_battery_info *pbi)
  72 {
  73         switch (pbi->flags & PMU_BATT_TYPE_MASK) {
  74         case PMU_BATT_TYPE_SMART:
  75                 return pmu_batt_types[0];
  76         case PMU_BATT_TYPE_COMET:
  77                 return pmu_batt_types[1];
  78         case PMU_BATT_TYPE_HOOPER:
  79                 return pmu_batt_types[2];
  80         default: break;
  81         }
  82         return pmu_batt_types[3];
  83 }
  84
  85 static int pmu_bat_get_property(struct power_supply *psy,
  86                                 enum power_supply_property psp,
  87                                 union power_supply_propval *val)
  88 {
  89         struct pmu_battery_dev *pbat = to_pmu_battery_dev(psy);
  90         struct pmu_battery_info *pbi = pbat->pbi;
  91
  92         switch (psp) {
  93         case POWER_SUPPLY_PROP_STATUS:
  94                 if (pbi->flags & PMU_BATT_CHARGING)
  95                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
  96                 else if (pmu_power_flags & PMU_PWR_AC_PRESENT)
  97                         val->intval = POWER_SUPPLY_STATUS_FULL;
  98                 else
  99                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 100                 break;
 101         case POWER_SUPPLY_PROP_PRESENT:
 102                 val->intval = !!(pbi->flags & PMU_BATT_PRESENT);
 103                 break;
 104         case POWER_SUPPLY_PROP_MODEL_NAME:
 105                 val->strval = pmu_bat_get_model_name(pbi);
 106                 break;
 107         case POWER_SUPPLY_PROP_ENERGY_AVG:
 108                 val->intval = pbi->charge     * 1000; /* mWh -> µWh */
 109                 break;
 110         case POWER_SUPPLY_PROP_ENERGY_FULL:
 111                 val->intval = pbi->max_charge * 1000; /* mWh -> µWh */
 112                 break;
 113         case POWER_SUPPLY_PROP_CURRENT_AVG:
 114                 val->intval = pbi->amperage   * 1000; /* mA -> µA */
 115                 break;
 116         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
 117                 val->intval = pbi->voltage    * 1000; /* mV -> µV */
 118                 break;
 119         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
 120                 val->intval = pbi->time_remaining;
 121                 break;
 122         default:
 123                 return -EINVAL;
 124         }
 125
 126         return 0;
 127 }
 128
 129 static enum power_supply_property pmu_bat_props[] = {
 130         POWER_SUPPLY_PROP_STATUS,
 131         POWER_SUPPLY_PROP_PRESENT,
 132         POWER_SUPPLY_PROP_MODEL_NAME,
 133         POWER_SUPPLY_PROP_ENERGY_AVG,
 134         POWER_SUPPLY_PROP_ENERGY_FULL,
 135         POWER_SUPPLY_PROP_CURRENT_AVG,
 136         POWER_SUPPLY_PROP_VOLTAGE_AVG,
 137         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 138 };
 139
 140 /*********************************************************************
 141  *              Initialisation
 142  *********************************************************************/
 143
 144 static struct platform_device *bat_pdev;
 145
 146 static int __init pmu_bat_init(void)
 147 {
 148         int ret = 0;
 149         int i;
 150
 151         bat_pdev = platform_device_register_simple("pmu-battery",
 152                                                    0, NULL, 0);
 153         if (IS_ERR(bat_pdev)) {
 154                 ret = PTR_ERR(bat_pdev);
 155                 goto pdev_register_failed;
 156         }
 157
 158         pmu_ac = power_supply_register(&bat_pdev->dev, &pmu_ac_desc, NULL);
 159         if (IS_ERR(pmu_ac)) {
 160                 ret = PTR_ERR(pmu_ac);
 161                 goto ac_register_failed;
 162         }
 163
 164         for (i = 0; i < pmu_battery_count; i++) {
 165                 struct power_supply_config psy_cfg = {};
 166                 struct pmu_battery_dev *pbat = kzalloc(sizeof(*pbat),
 167                                                        GFP_KERNEL);
 168                 if (!pbat)
 169                         break;
 170
 171                 sprintf(pbat->name, "PMU_battery_%d", i);
 172                 pbat->bat_desc.name = pbat->name;
 173                 pbat->bat_desc.properties = pmu_bat_props;
 174                 pbat->bat_desc.num_properties = ARRAY_SIZE(pmu_bat_props);
 175                 pbat->bat_desc.get_property = pmu_bat_get_property;
 176                 pbat->pbi = &pmu_batteries[i];
 177                 psy_cfg.drv_data = pbat;
 178
 179                 pbat->bat = power_supply_register(&bat_pdev->dev,
 180                                                   &pbat->bat_desc,
 181                                                   &psy_cfg);
 182                 if (IS_ERR(pbat->bat)) {
 183                         ret = PTR_ERR(pbat->bat);
 184                         kfree(pbat);
 185                         goto battery_register_failed;
 186                 }
 187                 pbats[i] = pbat;
 188         }
 189
 190         goto success;
 191
 192 battery_register_failed:
 193         while (i--) {
 194                 if (!pbats[i])
 195                         continue;
 196                 power_supply_unregister(pbats[i]->bat);
 197                 kfree(pbats[i]);
 198         }
 199         power_supply_unregister(pmu_ac);
 200 ac_register_failed:
 201         platform_device_unregister(bat_pdev);
 202 pdev_register_failed:
 203 success:
 204         return ret;
 205 }
 206
 207 static void __exit pmu_bat_exit(void)
 208 {
 209         int i;
 210
 211         for (i = 0; i < PMU_MAX_BATTERIES; i++) {
 212                 if (!pbats[i])
 213                         continue;
 214                 power_supply_unregister(pbats[i]->bat);
 215                 kfree(pbats[i]);
 216         }
 217         power_supply_unregister(pmu_ac);
 218         platform_device_unregister(bat_pdev);
 219 }
 220
 221 module_init(pmu_bat_init);
 222 module_exit(pmu_bat_exit);
 223
 224 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 225 MODULE_LICENSE("GPL");
 226 MODULE_DESCRIPTION("PMU battery driver");