2 * linux/drivers/power/wm97xx_battery.c
4 * Battery measurement code for WM97xx
6 * based on tosa_battery.c
8 * Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
16 #include <linux/init.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/power_supply.h>
21 #include <linux/wm97xx.h>
22 #include <linux/spinlock.h>
23 #include <linux/interrupt.h>
24 #include <linux/gpio.h>
25 #include <linux/irq.h>
26 #include <linux/slab.h>
28 static DEFINE_MUTEX(bat_lock);
29 static struct work_struct bat_work;
30 static struct mutex work_lock;
31 static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
32 static enum power_supply_property *prop;
34 static unsigned long wm97xx_read_bat(struct power_supply *bat_ps)
36 struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
37 struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
39 return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev->parent),
40 pdata->batt_aux) * pdata->batt_mult /
44 static unsigned long wm97xx_read_temp(struct power_supply *bat_ps)
46 struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
47 struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
49 return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev->parent),
50 pdata->temp_aux) * pdata->temp_mult /
54 static int wm97xx_bat_get_property(struct power_supply *bat_ps,
55 enum power_supply_property psp,
56 union power_supply_propval *val)
58 struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
59 struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
62 case POWER_SUPPLY_PROP_STATUS:
63 val->intval = bat_status;
65 case POWER_SUPPLY_PROP_TECHNOLOGY:
66 val->intval = pdata->batt_tech;
68 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
69 if (pdata->batt_aux >= 0)
70 val->intval = wm97xx_read_bat(bat_ps);
74 case POWER_SUPPLY_PROP_TEMP:
75 if (pdata->temp_aux >= 0)
76 val->intval = wm97xx_read_temp(bat_ps);
80 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
81 if (pdata->max_voltage >= 0)
82 val->intval = pdata->max_voltage;
86 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
87 if (pdata->min_voltage >= 0)
88 val->intval = pdata->min_voltage;
92 case POWER_SUPPLY_PROP_PRESENT:
101 static void wm97xx_bat_external_power_changed(struct power_supply *bat_ps)
103 schedule_work(&bat_work);
106 static void wm97xx_bat_update(struct power_supply *bat_ps)
108 int old_status = bat_status;
109 struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
110 struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
112 mutex_lock(&work_lock);
114 bat_status = (pdata->charge_gpio >= 0) ?
115 (gpio_get_value(pdata->charge_gpio) ?
116 POWER_SUPPLY_STATUS_DISCHARGING :
117 POWER_SUPPLY_STATUS_CHARGING) :
118 POWER_SUPPLY_STATUS_UNKNOWN;
120 if (old_status != bat_status) {
121 pr_debug("%s: %i -> %i\n", bat_ps->name, old_status,
123 power_supply_changed(bat_ps);
126 mutex_unlock(&work_lock);
129 static struct power_supply bat_ps = {
130 .type = POWER_SUPPLY_TYPE_BATTERY,
131 .get_property = wm97xx_bat_get_property,
132 .external_power_changed = wm97xx_bat_external_power_changed,
136 static void wm97xx_bat_work(struct work_struct *work)
138 wm97xx_bat_update(&bat_ps);
141 static irqreturn_t wm97xx_chrg_irq(int irq, void *data)
143 schedule_work(&bat_work);
148 static int wm97xx_bat_suspend(struct device *dev)
150 flush_work_sync(&bat_work);
154 static int wm97xx_bat_resume(struct device *dev)
156 schedule_work(&bat_work);
160 static const struct dev_pm_ops wm97xx_bat_pm_ops = {
161 .suspend = wm97xx_bat_suspend,
162 .resume = wm97xx_bat_resume,
166 static int __devinit wm97xx_bat_probe(struct platform_device *dev)
169 int props = 1; /* POWER_SUPPLY_PROP_PRESENT */
171 struct wm97xx_pdata *wmdata = dev->dev.platform_data;
172 struct wm97xx_batt_pdata *pdata;
175 dev_err(&dev->dev, "No platform data supplied\n");
179 pdata = wmdata->batt_pdata;
184 mutex_init(&work_lock);
187 dev_err(&dev->dev, "No platform_data supplied\n");
191 if (gpio_is_valid(pdata->charge_gpio)) {
192 ret = gpio_request(pdata->charge_gpio, "BATT CHRG");
195 ret = gpio_direction_input(pdata->charge_gpio);
198 ret = request_irq(gpio_to_irq(pdata->charge_gpio),
203 props++; /* POWER_SUPPLY_PROP_STATUS */
206 if (pdata->batt_tech >= 0)
207 props++; /* POWER_SUPPLY_PROP_TECHNOLOGY */
208 if (pdata->temp_aux >= 0)
209 props++; /* POWER_SUPPLY_PROP_TEMP */
210 if (pdata->batt_aux >= 0)
211 props++; /* POWER_SUPPLY_PROP_VOLTAGE_NOW */
212 if (pdata->max_voltage >= 0)
213 props++; /* POWER_SUPPLY_PROP_VOLTAGE_MAX */
214 if (pdata->min_voltage >= 0)
215 props++; /* POWER_SUPPLY_PROP_VOLTAGE_MIN */
217 prop = kzalloc(props * sizeof(*prop), GFP_KERNEL);
221 prop[i++] = POWER_SUPPLY_PROP_PRESENT;
222 if (pdata->charge_gpio >= 0)
223 prop[i++] = POWER_SUPPLY_PROP_STATUS;
224 if (pdata->batt_tech >= 0)
225 prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
226 if (pdata->temp_aux >= 0)
227 prop[i++] = POWER_SUPPLY_PROP_TEMP;
228 if (pdata->batt_aux >= 0)
229 prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW;
230 if (pdata->max_voltage >= 0)
231 prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX;
232 if (pdata->min_voltage >= 0)
233 prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN;
235 INIT_WORK(&bat_work, wm97xx_bat_work);
237 if (!pdata->batt_name) {
238 dev_info(&dev->dev, "Please consider setting proper battery "
239 "name in platform definition file, falling "
240 "back to name \"wm97xx-batt\"\n");
241 bat_ps.name = "wm97xx-batt";
243 bat_ps.name = pdata->batt_name;
245 bat_ps.properties = prop;
246 bat_ps.num_properties = props;
248 ret = power_supply_register(&dev->dev, &bat_ps);
250 schedule_work(&bat_work);
258 if (gpio_is_valid(pdata->charge_gpio))
259 free_irq(gpio_to_irq(pdata->charge_gpio), dev);
261 if (gpio_is_valid(pdata->charge_gpio))
262 gpio_free(pdata->charge_gpio);
267 static int __devexit wm97xx_bat_remove(struct platform_device *dev)
269 struct wm97xx_pdata *wmdata = dev->dev.platform_data;
270 struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
272 if (pdata && gpio_is_valid(pdata->charge_gpio)) {
273 free_irq(gpio_to_irq(pdata->charge_gpio), dev);
274 gpio_free(pdata->charge_gpio);
276 cancel_work_sync(&bat_work);
277 power_supply_unregister(&bat_ps);
282 static struct platform_driver wm97xx_bat_driver = {
284 .name = "wm97xx-battery",
285 .owner = THIS_MODULE,
287 .pm = &wm97xx_bat_pm_ops,
290 .probe = wm97xx_bat_probe,
291 .remove = __devexit_p(wm97xx_bat_remove),
294 module_platform_driver(wm97xx_bat_driver);
296 MODULE_LICENSE("GPL");
297 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
298 MODULE_DESCRIPTION("WM97xx battery driver");