power/supply/pmu_battery.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Battery class driver for Apple PMU
0004  *
0005  *  Copyright © 2006  David Woodhouse <dwmw2@infradead.org>
0006  */
0007
0008 #include <linux/module.h>
0009 #include <linux/platform_device.h>
0010 #include <linux/err.h>
0011 #include <linux/power_supply.h>
0012 #include <linux/adb.h>
0013 #include <linux/pmu.h>
0014 #include <linux/slab.h>
0015
0016 static struct pmu_battery_dev {
0017     struct power_supply *bat;
0018     struct power_supply_desc bat_desc;
0019     struct pmu_battery_info *pbi;
0020     char name[16];
0021     int propval;
0022 } *pbats[PMU_MAX_BATTERIES];
0023
0024 #define to_pmu_battery_dev(x) power_supply_get_drvdata(x)
0025
0026 /*********************************************************************
0027  *      Power
0028  *********************************************************************/
0029
0030 static int pmu_get_ac_prop(struct power_supply *psy,
0031                enum power_supply_property psp,
0032                union power_supply_propval *val)
0033 {
0034     switch (psp) {
0035     case POWER_SUPPLY_PROP_ONLINE:
0036         val->intval = (!!(pmu_power_flags & PMU_PWR_AC_PRESENT)) ||
0037                   (pmu_battery_count == 0);
0038         break;
0039     default:
0040         return -EINVAL;
0041     }
0042
0043     return 0;
0044 }
0045
0046 static enum power_supply_property pmu_ac_props[] = {
0047     POWER_SUPPLY_PROP_ONLINE,
0048 };
0049
0050 static const struct power_supply_desc pmu_ac_desc = {
0051     .name = "pmu-ac",
0052     .type = POWER_SUPPLY_TYPE_MAINS,
0053     .properties = pmu_ac_props,
0054     .num_properties = ARRAY_SIZE(pmu_ac_props),
0055     .get_property = pmu_get_ac_prop,
0056 };
0057
0058 static struct power_supply *pmu_ac;
0059
0060 /*********************************************************************
0061  *      Battery properties
0062  *********************************************************************/
0063
0064 static char *pmu_batt_types[] = {
0065     "Smart", "Comet", "Hooper", "Unknown"
0066 };
0067
0068 static char *pmu_bat_get_model_name(struct pmu_battery_info *pbi)
0069 {
0070     switch (pbi->flags & PMU_BATT_TYPE_MASK) {
0071     case PMU_BATT_TYPE_SMART:
0072         return pmu_batt_types[0];
0073     case PMU_BATT_TYPE_COMET:
0074         return pmu_batt_types[1];
0075     case PMU_BATT_TYPE_HOOPER:
0076         return pmu_batt_types[2];
0077     default: break;
0078     }
0079     return pmu_batt_types[3];
0080 }
0081
0082 static int pmu_bat_get_property(struct power_supply *psy,
0083                 enum power_supply_property psp,
0084                 union power_supply_propval *val)
0085 {
0086     struct pmu_battery_dev *pbat = to_pmu_battery_dev(psy);
0087     struct pmu_battery_info *pbi = pbat->pbi;
0088
0089     switch (psp) {
0090     case POWER_SUPPLY_PROP_STATUS:
0091         if (pbi->flags & PMU_BATT_CHARGING)
0092             val->intval = POWER_SUPPLY_STATUS_CHARGING;
0093         else if (pmu_power_flags & PMU_PWR_AC_PRESENT)
0094             val->intval = POWER_SUPPLY_STATUS_FULL;
0095         else
0096             val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
0097         break;
0098     case POWER_SUPPLY_PROP_PRESENT:
0099         val->intval = !!(pbi->flags & PMU_BATT_PRESENT);
0100         break;
0101     case POWER_SUPPLY_PROP_MODEL_NAME:
0102         val->strval = pmu_bat_get_model_name(pbi);
0103         break;
0104     case POWER_SUPPLY_PROP_ENERGY_AVG:
0105         val->intval = pbi->charge     * 1000; /* mWh -> µWh */
0106         break;
0107     case POWER_SUPPLY_PROP_ENERGY_FULL:
0108         val->intval = pbi->max_charge * 1000; /* mWh -> µWh */
0109         break;
0110     case POWER_SUPPLY_PROP_CURRENT_AVG:
0111         val->intval = pbi->amperage   * 1000; /* mA -> µA */
0112         break;
0113     case POWER_SUPPLY_PROP_VOLTAGE_AVG:
0114         val->intval = pbi->voltage    * 1000; /* mV -> µV */
0115         break;
0116     case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
0117         val->intval = pbi->time_remaining;
0118         break;
0119     default:
0120         return -EINVAL;
0121     }
0122
0123     return 0;
0124 }
0125
0126 static enum power_supply_property pmu_bat_props[] = {
0127     POWER_SUPPLY_PROP_STATUS,
0128     POWER_SUPPLY_PROP_PRESENT,
0129     POWER_SUPPLY_PROP_MODEL_NAME,
0130     POWER_SUPPLY_PROP_ENERGY_AVG,
0131     POWER_SUPPLY_PROP_ENERGY_FULL,
0132     POWER_SUPPLY_PROP_CURRENT_AVG,
0133     POWER_SUPPLY_PROP_VOLTAGE_AVG,
0134     POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
0135 };
0136
0137 /*********************************************************************
0138  *      Initialisation
0139  *********************************************************************/
0140
0141 static struct platform_device *bat_pdev;
0142
0143 static int __init pmu_bat_init(void)
0144 {
0145     int ret = 0;
0146     int i;
0147
0148     bat_pdev = platform_device_register_simple("pmu-battery",
0149                            0, NULL, 0);
0150     if (IS_ERR(bat_pdev)) {
0151         ret = PTR_ERR(bat_pdev);
0152         goto pdev_register_failed;
0153     }
0154
0155     pmu_ac = power_supply_register(&bat_pdev->dev, &pmu_ac_desc, NULL);
0156     if (IS_ERR(pmu_ac)) {
0157         ret = PTR_ERR(pmu_ac);
0158         goto ac_register_failed;
0159     }
0160
0161     for (i = 0; i < pmu_battery_count; i++) {
0162         struct power_supply_config psy_cfg = {};
0163         struct pmu_battery_dev *pbat = kzalloc(sizeof(*pbat),
0164                                GFP_KERNEL);
0165         if (!pbat)
0166             break;
0167
0168         sprintf(pbat->name, "PMU_battery_%d", i);
0169         pbat->bat_desc.name = pbat->name;
0170         pbat->bat_desc.properties = pmu_bat_props;
0171         pbat->bat_desc.num_properties = ARRAY_SIZE(pmu_bat_props);
0172         pbat->bat_desc.get_property = pmu_bat_get_property;
0173         pbat->pbi = &pmu_batteries[i];
0174         psy_cfg.drv_data = pbat;
0175
0176         pbat->bat = power_supply_register(&bat_pdev->dev,
0177                           &pbat->bat_desc,
0178                           &psy_cfg);
0179         if (IS_ERR(pbat->bat)) {
0180             ret = PTR_ERR(pbat->bat);
0181             kfree(pbat);
0182             goto battery_register_failed;
0183         }
0184         pbats[i] = pbat;
0185     }
0186
0187     goto success;
0188
0189 battery_register_failed:
0190     while (i--) {
0191         if (!pbats[i])
0192             continue;
0193         power_supply_unregister(pbats[i]->bat);
0194         kfree(pbats[i]);
0195     }
0196     power_supply_unregister(pmu_ac);
0197 ac_register_failed:
0198     platform_device_unregister(bat_pdev);
0199 pdev_register_failed:
0200 success:
0201     return ret;
0202 }
0203
0204 static void __exit pmu_bat_exit(void)
0205 {
0206     int i;
0207
0208     for (i = 0; i < PMU_MAX_BATTERIES; i++) {
0209         if (!pbats[i])
0210             continue;
0211         power_supply_unregister(pbats[i]->bat);
0212         kfree(pbats[i]);
0213     }
0214     power_supply_unregister(pmu_ac);
0215     platform_device_unregister(bat_pdev);
0216 }
0217
0218 module_init(pmu_bat_init);
0219 module_exit(pmu_bat_exit);
0220
0221 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
0222 MODULE_LICENSE("GPL");
0223 MODULE_DESCRIPTION("PMU battery driver");