2 * Battery measurement code for WM97xx
4 * based on tosa_battery.c
6 * Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
14 #include <linux/init.h>
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/platform_device.h>
18 #include <linux/power_supply.h>
19 #include <linux/wm97xx.h>
20 #include <linux/spinlock.h>
21 #include <linux/interrupt.h>
22 #include <linux/gpio.h>
23 #include <linux/irq.h>
24 #include <linux/slab.h>
26 static struct work_struct bat_work;
27 static DEFINE_MUTEX(work_lock);
28 static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
29 static enum power_supply_property *prop;
31 static unsigned long wm97xx_read_bat(struct power_supply *bat_ps)
33 struct wm97xx_pdata *wmdata = bat_ps->dev.parent->platform_data;
34 struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
36 return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev.parent),
37 pdata->batt_aux) * pdata->batt_mult /
41 static unsigned long wm97xx_read_temp(struct power_supply *bat_ps)
43 struct wm97xx_pdata *wmdata = bat_ps->dev.parent->platform_data;
44 struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
46 return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev.parent),
47 pdata->temp_aux) * pdata->temp_mult /
51 static int wm97xx_bat_get_property(struct power_supply *bat_ps,
52 enum power_supply_property psp,
53 union power_supply_propval *val)
55 struct wm97xx_pdata *wmdata = bat_ps->dev.parent->platform_data;
56 struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
59 case POWER_SUPPLY_PROP_STATUS:
60 val->intval = bat_status;
62 case POWER_SUPPLY_PROP_TECHNOLOGY:
63 val->intval = pdata->batt_tech;
65 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
66 if (pdata->batt_aux >= 0)
67 val->intval = wm97xx_read_bat(bat_ps);
71 case POWER_SUPPLY_PROP_TEMP:
72 if (pdata->temp_aux >= 0)
73 val->intval = wm97xx_read_temp(bat_ps);
77 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
78 if (pdata->max_voltage >= 0)
79 val->intval = pdata->max_voltage;
83 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
84 if (pdata->min_voltage >= 0)
85 val->intval = pdata->min_voltage;
89 case POWER_SUPPLY_PROP_PRESENT:
98 static void wm97xx_bat_external_power_changed(struct power_supply *bat_ps)
100 schedule_work(&bat_work);
103 static void wm97xx_bat_update(struct power_supply *bat_ps)
105 int old_status = bat_status;
106 struct wm97xx_pdata *wmdata = bat_ps->dev.parent->platform_data;
107 struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
109 mutex_lock(&work_lock);
111 bat_status = (pdata->charge_gpio >= 0) ?
112 (gpio_get_value(pdata->charge_gpio) ?
113 POWER_SUPPLY_STATUS_DISCHARGING :
114 POWER_SUPPLY_STATUS_CHARGING) :
115 POWER_SUPPLY_STATUS_UNKNOWN;
117 if (old_status != bat_status) {
118 pr_debug("%s: %i -> %i\n", bat_ps->desc->name, old_status,
120 power_supply_changed(bat_ps);
123 mutex_unlock(&work_lock);
126 static struct power_supply *bat_psy;
127 static struct power_supply_desc bat_psy_desc = {
128 .type = POWER_SUPPLY_TYPE_BATTERY,
129 .get_property = wm97xx_bat_get_property,
130 .external_power_changed = wm97xx_bat_external_power_changed,
134 static void wm97xx_bat_work(struct work_struct *work)
136 wm97xx_bat_update(bat_psy);
139 static irqreturn_t wm97xx_chrg_irq(int irq, void *data)
141 schedule_work(&bat_work);
146 static int wm97xx_bat_suspend(struct device *dev)
148 flush_work(&bat_work);
152 static int wm97xx_bat_resume(struct device *dev)
154 schedule_work(&bat_work);
158 static const struct dev_pm_ops wm97xx_bat_pm_ops = {
159 .suspend = wm97xx_bat_suspend,
160 .resume = wm97xx_bat_resume,
164 static int wm97xx_bat_probe(struct platform_device *dev)
167 int props = 1; /* POWER_SUPPLY_PROP_PRESENT */
169 struct wm97xx_pdata *wmdata = dev->dev.platform_data;
170 struct wm97xx_batt_pdata *pdata;
173 dev_err(&dev->dev, "No platform data supplied\n");
177 pdata = wmdata->batt_pdata;
183 dev_err(&dev->dev, "No platform_data supplied\n");
187 if (gpio_is_valid(pdata->charge_gpio)) {
188 ret = gpio_request(pdata->charge_gpio, "BATT CHRG");
191 ret = gpio_direction_input(pdata->charge_gpio);
194 ret = request_irq(gpio_to_irq(pdata->charge_gpio),
199 props++; /* POWER_SUPPLY_PROP_STATUS */
202 if (pdata->batt_tech >= 0)
203 props++; /* POWER_SUPPLY_PROP_TECHNOLOGY */
204 if (pdata->temp_aux >= 0)
205 props++; /* POWER_SUPPLY_PROP_TEMP */
206 if (pdata->batt_aux >= 0)
207 props++; /* POWER_SUPPLY_PROP_VOLTAGE_NOW */
208 if (pdata->max_voltage >= 0)
209 props++; /* POWER_SUPPLY_PROP_VOLTAGE_MAX */
210 if (pdata->min_voltage >= 0)
211 props++; /* POWER_SUPPLY_PROP_VOLTAGE_MIN */
213 prop = kzalloc(props * sizeof(*prop), GFP_KERNEL);
219 prop[i++] = POWER_SUPPLY_PROP_PRESENT;
220 if (pdata->charge_gpio >= 0)
221 prop[i++] = POWER_SUPPLY_PROP_STATUS;
222 if (pdata->batt_tech >= 0)
223 prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
224 if (pdata->temp_aux >= 0)
225 prop[i++] = POWER_SUPPLY_PROP_TEMP;
226 if (pdata->batt_aux >= 0)
227 prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW;
228 if (pdata->max_voltage >= 0)
229 prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX;
230 if (pdata->min_voltage >= 0)
231 prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN;
233 INIT_WORK(&bat_work, wm97xx_bat_work);
235 if (!pdata->batt_name) {
236 dev_info(&dev->dev, "Please consider setting proper battery "
237 "name in platform definition file, falling "
238 "back to name \"wm97xx-batt\"\n");
239 bat_psy_desc.name = "wm97xx-batt";
241 bat_psy_desc.name = pdata->batt_name;
243 bat_psy_desc.properties = prop;
244 bat_psy_desc.num_properties = props;
246 bat_psy = power_supply_register(&dev->dev, &bat_psy_desc, NULL);
247 if (!IS_ERR(bat_psy)) {
248 schedule_work(&bat_work);
250 ret = PTR_ERR(bat_psy);
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 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_psy);
282 static struct platform_driver wm97xx_bat_driver = {
284 .name = "wm97xx-battery",
286 .pm = &wm97xx_bat_pm_ops,
289 .probe = wm97xx_bat_probe,
290 .remove = wm97xx_bat_remove,
293 module_platform_driver(wm97xx_bat_driver);
295 MODULE_LICENSE("GPL");
296 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
297 MODULE_DESCRIPTION("WM97xx battery driver");