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
 19static 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
 32static 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
 48static enum power_supply_property pmu_ac_props[] = {
 49	POWER_SUPPLY_PROP_ONLINE,
 50};
 51
 52static 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
 64static char *pmu_batt_types[] = {
 65	"Smart", "Comet", "Hooper", "Unknown"
 66};
 67
 68static 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
 82static 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
126static 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
141static struct platform_device *bat_pdev;
142
143static 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
182battery_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);
190ac_register_failed:
191	platform_device_unregister(bat_pdev);
192pdev_register_failed:
193success:
194	return ret;
195}
196
197static 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
211module_init(pmu_bat_init);
212module_exit(pmu_bat_exit);
213
214MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
215MODULE_LICENSE("GPL");
216MODULE_DESCRIPTION("PMU battery driver");