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Marek Vašut4e9687d2008-09-11 19:37:32 +01001/*
2 * linux/drivers/power/wm97xx_battery.c
3 *
4 * Battery measurement code for WM97xx
5 *
6 * based on tosa_battery.c
7 *
8 * Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
9 *
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.
13 *
14 */
15
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>
Marek Vasut7c879422009-07-23 16:02:08 +020025#include <linux/irq.h>
Marek Vašut4e9687d2008-09-11 19:37:32 +010026
27static DEFINE_MUTEX(bat_lock);
28static struct work_struct bat_work;
29struct mutex work_lock;
30static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
Marek Vasutb8bdc1d2009-08-31 06:20:12 +020031static struct wm97xx_batt_info *gpdata;
Marek Vašut4e9687d2008-09-11 19:37:32 +010032static enum power_supply_property *prop;
33
34static unsigned long wm97xx_read_bat(struct power_supply *bat_ps)
35{
Marek Vasutb8bdc1d2009-08-31 06:20:12 +020036 struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
37 struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
38
Alexander Beregalov38c7dc32009-06-23 17:50:06 +040039 return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev->parent),
Marek Vašut4e9687d2008-09-11 19:37:32 +010040 pdata->batt_aux) * pdata->batt_mult /
41 pdata->batt_div;
42}
43
44static unsigned long wm97xx_read_temp(struct power_supply *bat_ps)
45{
Marek Vasutb8bdc1d2009-08-31 06:20:12 +020046 struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
47 struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
48
Alexander Beregalov38c7dc32009-06-23 17:50:06 +040049 return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev->parent),
Marek Vašut4e9687d2008-09-11 19:37:32 +010050 pdata->temp_aux) * pdata->temp_mult /
51 pdata->temp_div;
52}
53
54static int wm97xx_bat_get_property(struct power_supply *bat_ps,
55 enum power_supply_property psp,
56 union power_supply_propval *val)
57{
Marek Vasutb8bdc1d2009-08-31 06:20:12 +020058 struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
59 struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
60
Marek Vašut4e9687d2008-09-11 19:37:32 +010061 switch (psp) {
62 case POWER_SUPPLY_PROP_STATUS:
63 val->intval = bat_status;
64 break;
65 case POWER_SUPPLY_PROP_TECHNOLOGY:
66 val->intval = pdata->batt_tech;
67 break;
68 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
69 if (pdata->batt_aux >= 0)
70 val->intval = wm97xx_read_bat(bat_ps);
71 else
72 return -EINVAL;
73 break;
74 case POWER_SUPPLY_PROP_TEMP:
75 if (pdata->temp_aux >= 0)
76 val->intval = wm97xx_read_temp(bat_ps);
77 else
78 return -EINVAL;
79 break;
80 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
81 if (pdata->max_voltage >= 0)
82 val->intval = pdata->max_voltage;
83 else
84 return -EINVAL;
85 break;
86 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
87 if (pdata->min_voltage >= 0)
88 val->intval = pdata->min_voltage;
89 else
90 return -EINVAL;
91 break;
92 case POWER_SUPPLY_PROP_PRESENT:
93 val->intval = 1;
94 break;
95 default:
96 return -EINVAL;
97 }
98 return 0;
99}
100
101static void wm97xx_bat_external_power_changed(struct power_supply *bat_ps)
102{
103 schedule_work(&bat_work);
104}
105
106static void wm97xx_bat_update(struct power_supply *bat_ps)
107{
108 int old_status = bat_status;
Marek Vasutb8bdc1d2009-08-31 06:20:12 +0200109 struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
110 struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
Marek Vašut4e9687d2008-09-11 19:37:32 +0100111
112 mutex_lock(&work_lock);
113
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;
119
120 if (old_status != bat_status) {
121 pr_debug("%s: %i -> %i\n", bat_ps->name, old_status,
122 bat_status);
123 power_supply_changed(bat_ps);
124 }
125
126 mutex_unlock(&work_lock);
127}
128
129static 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,
133 .use_for_apm = 1,
134};
135
136static void wm97xx_bat_work(struct work_struct *work)
137{
138 wm97xx_bat_update(&bat_ps);
139}
140
Marek Vasut7c879422009-07-23 16:02:08 +0200141static irqreturn_t wm97xx_chrg_irq(int irq, void *data)
142{
143 schedule_work(&bat_work);
144 return IRQ_HANDLED;
145}
146
Marek Vašut4e9687d2008-09-11 19:37:32 +0100147#ifdef CONFIG_PM
Marek Vasut83a8af02009-08-22 00:36:43 +0200148static int wm97xx_bat_suspend(struct device *dev)
Marek Vašut4e9687d2008-09-11 19:37:32 +0100149{
150 flush_scheduled_work();
151 return 0;
152}
153
Marek Vasut83a8af02009-08-22 00:36:43 +0200154static int wm97xx_bat_resume(struct device *dev)
Marek Vašut4e9687d2008-09-11 19:37:32 +0100155{
156 schedule_work(&bat_work);
157 return 0;
158}
Marek Vasut83a8af02009-08-22 00:36:43 +0200159
160static struct dev_pm_ops wm97xx_bat_pm_ops = {
161 .suspend = wm97xx_bat_suspend,
162 .resume = wm97xx_bat_resume,
163};
Marek Vašut4e9687d2008-09-11 19:37:32 +0100164#endif
165
166static int __devinit wm97xx_bat_probe(struct platform_device *dev)
167{
168 int ret = 0;
169 int props = 1; /* POWER_SUPPLY_PROP_PRESENT */
170 int i = 0;
Marek Vasutb8bdc1d2009-08-31 06:20:12 +0200171 struct wm97xx_pdata *wmdata = dev->dev.platform_data;
172 struct wm97xx_batt_pdata *pdata;
173
174 if (gpdata) {
175 dev_err(&dev->dev, "Do not pass platform_data through "
176 "wm97xx_bat_set_pdata!\n");
177 return -EINVAL;
178 } else
179 pdata = wmdata->batt_pdata;
Marek Vašut4e9687d2008-09-11 19:37:32 +0100180
181 if (dev->id != -1)
182 return -EINVAL;
183
184 mutex_init(&work_lock);
185
186 if (!pdata) {
Marek Vasutb8bdc1d2009-08-31 06:20:12 +0200187 dev_err(&dev->dev, "No platform_data supplied\n");
Marek Vašut4e9687d2008-09-11 19:37:32 +0100188 return -EINVAL;
189 }
190
Marek Vasut7c879422009-07-23 16:02:08 +0200191 if (gpio_is_valid(pdata->charge_gpio)) {
Marek Vašut4e9687d2008-09-11 19:37:32 +0100192 ret = gpio_request(pdata->charge_gpio, "BATT CHRG");
193 if (ret)
194 goto err;
195 ret = gpio_direction_input(pdata->charge_gpio);
196 if (ret)
197 goto err2;
Marek Vasut7c879422009-07-23 16:02:08 +0200198 ret = request_irq(gpio_to_irq(pdata->charge_gpio),
199 wm97xx_chrg_irq, IRQF_DISABLED,
200 "AC Detect", 0);
201 if (ret)
202 goto err2;
Marek Vašut4e9687d2008-09-11 19:37:32 +0100203 props++; /* POWER_SUPPLY_PROP_STATUS */
204 }
205
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 */
216
217 prop = kzalloc(props * sizeof(*prop), GFP_KERNEL);
218 if (!prop)
Marek Vasut7c879422009-07-23 16:02:08 +0200219 goto err3;
Marek Vašut4e9687d2008-09-11 19:37:32 +0100220
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;
234
235 INIT_WORK(&bat_work, wm97xx_bat_work);
236
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";
242 } else
243 bat_ps.name = pdata->batt_name;
244
245 bat_ps.properties = prop;
246 bat_ps.num_properties = props;
247
248 ret = power_supply_register(&dev->dev, &bat_ps);
249 if (!ret)
250 schedule_work(&bat_work);
251 else
Marek Vasut7c879422009-07-23 16:02:08 +0200252 goto err4;
Marek Vašut4e9687d2008-09-11 19:37:32 +0100253
254 return 0;
Marek Vasut7c879422009-07-23 16:02:08 +0200255err4:
Marek Vašut4e9687d2008-09-11 19:37:32 +0100256 kfree(prop);
Marek Vasut7c879422009-07-23 16:02:08 +0200257err3:
258 if (gpio_is_valid(pdata->charge_gpio))
259 free_irq(gpio_to_irq(pdata->charge_gpio), dev);
Marek Vašut4e9687d2008-09-11 19:37:32 +0100260err2:
Marek Vasut7c879422009-07-23 16:02:08 +0200261 if (gpio_is_valid(pdata->charge_gpio))
262 gpio_free(pdata->charge_gpio);
Marek Vašut4e9687d2008-09-11 19:37:32 +0100263err:
264 return ret;
265}
266
267static int __devexit wm97xx_bat_remove(struct platform_device *dev)
268{
Marek Vasutb8bdc1d2009-08-31 06:20:12 +0200269 struct wm97xx_pdata *wmdata = dev->dev.platform_data;
270 struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
271
Marek Vasut7c879422009-07-23 16:02:08 +0200272 if (pdata && gpio_is_valid(pdata->charge_gpio)) {
273 free_irq(gpio_to_irq(pdata->charge_gpio), dev);
Marek Vašut4e9687d2008-09-11 19:37:32 +0100274 gpio_free(pdata->charge_gpio);
Marek Vasut7c879422009-07-23 16:02:08 +0200275 }
Marek Vašut4e9687d2008-09-11 19:37:32 +0100276 flush_scheduled_work();
277 power_supply_unregister(&bat_ps);
278 kfree(prop);
279 return 0;
280}
281
282static struct platform_driver wm97xx_bat_driver = {
283 .driver = {
284 .name = "wm97xx-battery",
285 .owner = THIS_MODULE,
Marek Vasut83a8af02009-08-22 00:36:43 +0200286#ifdef CONFIG_PM
287 .pm = &wm97xx_bat_pm_ops,
288#endif
Marek Vašut4e9687d2008-09-11 19:37:32 +0100289 },
290 .probe = wm97xx_bat_probe,
291 .remove = __devexit_p(wm97xx_bat_remove),
Marek Vašut4e9687d2008-09-11 19:37:32 +0100292};
293
294static int __init wm97xx_bat_init(void)
295{
296 return platform_driver_register(&wm97xx_bat_driver);
297}
298
299static void __exit wm97xx_bat_exit(void)
300{
301 platform_driver_unregister(&wm97xx_bat_driver);
302}
303
Marek Vasutb8bdc1d2009-08-31 06:20:12 +0200304void wm97xx_bat_set_pdata(struct wm97xx_batt_info *data)
Marek Vašut4e9687d2008-09-11 19:37:32 +0100305{
Marek Vasutb8bdc1d2009-08-31 06:20:12 +0200306 gpdata = data;
Marek Vašut4e9687d2008-09-11 19:37:32 +0100307}
308EXPORT_SYMBOL_GPL(wm97xx_bat_set_pdata);
309
310module_init(wm97xx_bat_init);
311module_exit(wm97xx_bat_exit);
312
313MODULE_LICENSE("GPL");
314MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
315MODULE_DESCRIPTION("WM97xx battery driver");