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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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090026#include <linux/slab.h>
Marek Vašut4e9687d2008-09-11 19:37:32 +010027
Marek Vašut4e9687d2008-09-11 19:37:32 +010028static struct work_struct bat_work;
Axel Lindaf22c32011-11-28 22:37:35 +080029static DEFINE_MUTEX(work_lock);
Marek Vašut4e9687d2008-09-11 19:37:32 +010030static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
Marek Vašut4e9687d2008-09-11 19:37:32 +010031static enum power_supply_property *prop;
32
33static unsigned long wm97xx_read_bat(struct power_supply *bat_ps)
34{
Marek Vasutb8bdc1d2009-08-31 06:20:12 +020035 struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
36 struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
37
Alexander Beregalov38c7dc32009-06-23 17:50:06 +040038 return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev->parent),
Marek Vašut4e9687d2008-09-11 19:37:32 +010039 pdata->batt_aux) * pdata->batt_mult /
40 pdata->batt_div;
41}
42
43static unsigned long wm97xx_read_temp(struct power_supply *bat_ps)
44{
Marek Vasutb8bdc1d2009-08-31 06:20:12 +020045 struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
46 struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
47
Alexander Beregalov38c7dc32009-06-23 17:50:06 +040048 return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev->parent),
Marek Vašut4e9687d2008-09-11 19:37:32 +010049 pdata->temp_aux) * pdata->temp_mult /
50 pdata->temp_div;
51}
52
53static int wm97xx_bat_get_property(struct power_supply *bat_ps,
54 enum power_supply_property psp,
55 union power_supply_propval *val)
56{
Marek Vasutb8bdc1d2009-08-31 06:20:12 +020057 struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
58 struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
59
Marek Vašut4e9687d2008-09-11 19:37:32 +010060 switch (psp) {
61 case POWER_SUPPLY_PROP_STATUS:
62 val->intval = bat_status;
63 break;
64 case POWER_SUPPLY_PROP_TECHNOLOGY:
65 val->intval = pdata->batt_tech;
66 break;
67 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
68 if (pdata->batt_aux >= 0)
69 val->intval = wm97xx_read_bat(bat_ps);
70 else
71 return -EINVAL;
72 break;
73 case POWER_SUPPLY_PROP_TEMP:
74 if (pdata->temp_aux >= 0)
75 val->intval = wm97xx_read_temp(bat_ps);
76 else
77 return -EINVAL;
78 break;
79 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
80 if (pdata->max_voltage >= 0)
81 val->intval = pdata->max_voltage;
82 else
83 return -EINVAL;
84 break;
85 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
86 if (pdata->min_voltage >= 0)
87 val->intval = pdata->min_voltage;
88 else
89 return -EINVAL;
90 break;
91 case POWER_SUPPLY_PROP_PRESENT:
92 val->intval = 1;
93 break;
94 default:
95 return -EINVAL;
96 }
97 return 0;
98}
99
100static void wm97xx_bat_external_power_changed(struct power_supply *bat_ps)
101{
102 schedule_work(&bat_work);
103}
104
105static void wm97xx_bat_update(struct power_supply *bat_ps)
106{
107 int old_status = bat_status;
Marek Vasutb8bdc1d2009-08-31 06:20:12 +0200108 struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
109 struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
Marek Vašut4e9687d2008-09-11 19:37:32 +0100110
111 mutex_lock(&work_lock);
112
113 bat_status = (pdata->charge_gpio >= 0) ?
114 (gpio_get_value(pdata->charge_gpio) ?
115 POWER_SUPPLY_STATUS_DISCHARGING :
116 POWER_SUPPLY_STATUS_CHARGING) :
117 POWER_SUPPLY_STATUS_UNKNOWN;
118
119 if (old_status != bat_status) {
120 pr_debug("%s: %i -> %i\n", bat_ps->name, old_status,
121 bat_status);
122 power_supply_changed(bat_ps);
123 }
124
125 mutex_unlock(&work_lock);
126}
127
128static struct power_supply bat_ps = {
129 .type = POWER_SUPPLY_TYPE_BATTERY,
130 .get_property = wm97xx_bat_get_property,
131 .external_power_changed = wm97xx_bat_external_power_changed,
132 .use_for_apm = 1,
133};
134
135static void wm97xx_bat_work(struct work_struct *work)
136{
137 wm97xx_bat_update(&bat_ps);
138}
139
Marek Vasut7c879422009-07-23 16:02:08 +0200140static irqreturn_t wm97xx_chrg_irq(int irq, void *data)
141{
142 schedule_work(&bat_work);
143 return IRQ_HANDLED;
144}
145
Marek Vašut4e9687d2008-09-11 19:37:32 +0100146#ifdef CONFIG_PM
Marek Vasut83a8af02009-08-22 00:36:43 +0200147static int wm97xx_bat_suspend(struct device *dev)
Marek Vašut4e9687d2008-09-11 19:37:32 +0100148{
Tejun Heo43829732012-08-20 14:51:24 -0700149 flush_work(&bat_work);
Marek Vašut4e9687d2008-09-11 19:37:32 +0100150 return 0;
151}
152
Marek Vasut83a8af02009-08-22 00:36:43 +0200153static int wm97xx_bat_resume(struct device *dev)
Marek Vašut4e9687d2008-09-11 19:37:32 +0100154{
155 schedule_work(&bat_work);
156 return 0;
157}
Marek Vasut83a8af02009-08-22 00:36:43 +0200158
Alexey Dobriyan47145212009-12-14 18:00:08 -0800159static const struct dev_pm_ops wm97xx_bat_pm_ops = {
Marek Vasut83a8af02009-08-22 00:36:43 +0200160 .suspend = wm97xx_bat_suspend,
161 .resume = wm97xx_bat_resume,
162};
Marek Vašut4e9687d2008-09-11 19:37:32 +0100163#endif
164
Bill Pembertonc8afa642012-11-19 13:22:23 -0500165static int wm97xx_bat_probe(struct platform_device *dev)
Marek Vašut4e9687d2008-09-11 19:37:32 +0100166{
167 int ret = 0;
168 int props = 1; /* POWER_SUPPLY_PROP_PRESENT */
169 int i = 0;
Marek Vasutb8bdc1d2009-08-31 06:20:12 +0200170 struct wm97xx_pdata *wmdata = dev->dev.platform_data;
171 struct wm97xx_batt_pdata *pdata;
172
Mark Brown12b336a2010-01-27 20:43:21 +0000173 if (!wmdata) {
174 dev_err(&dev->dev, "No platform data supplied\n");
175 return -EINVAL;
176 }
177
178 pdata = wmdata->batt_pdata;
Marek Vašut4e9687d2008-09-11 19:37:32 +0100179
180 if (dev->id != -1)
181 return -EINVAL;
182
Marek Vašut4e9687d2008-09-11 19:37:32 +0100183 if (!pdata) {
Marek Vasutb8bdc1d2009-08-31 06:20:12 +0200184 dev_err(&dev->dev, "No platform_data supplied\n");
Marek Vašut4e9687d2008-09-11 19:37:32 +0100185 return -EINVAL;
186 }
187
Marek Vasut7c879422009-07-23 16:02:08 +0200188 if (gpio_is_valid(pdata->charge_gpio)) {
Marek Vašut4e9687d2008-09-11 19:37:32 +0100189 ret = gpio_request(pdata->charge_gpio, "BATT CHRG");
190 if (ret)
191 goto err;
192 ret = gpio_direction_input(pdata->charge_gpio);
193 if (ret)
194 goto err2;
Marek Vasut7c879422009-07-23 16:02:08 +0200195 ret = request_irq(gpio_to_irq(pdata->charge_gpio),
Yong Zhang3b176b22011-09-22 16:59:11 +0800196 wm97xx_chrg_irq, 0,
Mark Brownf8d94eb2010-01-27 20:45:35 +0000197 "AC Detect", dev);
Marek Vasut7c879422009-07-23 16:02:08 +0200198 if (ret)
199 goto err2;
Marek Vašut4e9687d2008-09-11 19:37:32 +0100200 props++; /* POWER_SUPPLY_PROP_STATUS */
201 }
202
203 if (pdata->batt_tech >= 0)
204 props++; /* POWER_SUPPLY_PROP_TECHNOLOGY */
205 if (pdata->temp_aux >= 0)
206 props++; /* POWER_SUPPLY_PROP_TEMP */
207 if (pdata->batt_aux >= 0)
208 props++; /* POWER_SUPPLY_PROP_VOLTAGE_NOW */
209 if (pdata->max_voltage >= 0)
210 props++; /* POWER_SUPPLY_PROP_VOLTAGE_MAX */
211 if (pdata->min_voltage >= 0)
212 props++; /* POWER_SUPPLY_PROP_VOLTAGE_MIN */
213
214 prop = kzalloc(props * sizeof(*prop), GFP_KERNEL);
Julia Lawall588d4f02012-08-19 10:44:18 +0200215 if (!prop) {
216 ret = -ENOMEM;
Marek Vasut7c879422009-07-23 16:02:08 +0200217 goto err3;
Julia Lawall588d4f02012-08-19 10:44:18 +0200218 }
Marek Vašut4e9687d2008-09-11 19:37:32 +0100219
220 prop[i++] = POWER_SUPPLY_PROP_PRESENT;
221 if (pdata->charge_gpio >= 0)
222 prop[i++] = POWER_SUPPLY_PROP_STATUS;
223 if (pdata->batt_tech >= 0)
224 prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
225 if (pdata->temp_aux >= 0)
226 prop[i++] = POWER_SUPPLY_PROP_TEMP;
227 if (pdata->batt_aux >= 0)
228 prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW;
229 if (pdata->max_voltage >= 0)
230 prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX;
231 if (pdata->min_voltage >= 0)
232 prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN;
233
234 INIT_WORK(&bat_work, wm97xx_bat_work);
235
236 if (!pdata->batt_name) {
237 dev_info(&dev->dev, "Please consider setting proper battery "
238 "name in platform definition file, falling "
239 "back to name \"wm97xx-batt\"\n");
240 bat_ps.name = "wm97xx-batt";
241 } else
242 bat_ps.name = pdata->batt_name;
243
244 bat_ps.properties = prop;
245 bat_ps.num_properties = props;
246
247 ret = power_supply_register(&dev->dev, &bat_ps);
248 if (!ret)
249 schedule_work(&bat_work);
250 else
Marek Vasut7c879422009-07-23 16:02:08 +0200251 goto err4;
Marek Vašut4e9687d2008-09-11 19:37:32 +0100252
253 return 0;
Marek Vasut7c879422009-07-23 16:02:08 +0200254err4:
Marek Vašut4e9687d2008-09-11 19:37:32 +0100255 kfree(prop);
Marek Vasut7c879422009-07-23 16:02:08 +0200256err3:
257 if (gpio_is_valid(pdata->charge_gpio))
258 free_irq(gpio_to_irq(pdata->charge_gpio), dev);
Marek Vašut4e9687d2008-09-11 19:37:32 +0100259err2:
Marek Vasut7c879422009-07-23 16:02:08 +0200260 if (gpio_is_valid(pdata->charge_gpio))
261 gpio_free(pdata->charge_gpio);
Marek Vašut4e9687d2008-09-11 19:37:32 +0100262err:
263 return ret;
264}
265
Bill Pemberton415ec692012-11-19 13:26:07 -0500266static int wm97xx_bat_remove(struct platform_device *dev)
Marek Vašut4e9687d2008-09-11 19:37:32 +0100267{
Marek Vasutb8bdc1d2009-08-31 06:20:12 +0200268 struct wm97xx_pdata *wmdata = dev->dev.platform_data;
269 struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
270
Marek Vasut7c879422009-07-23 16:02:08 +0200271 if (pdata && gpio_is_valid(pdata->charge_gpio)) {
272 free_irq(gpio_to_irq(pdata->charge_gpio), dev);
Marek Vašut4e9687d2008-09-11 19:37:32 +0100273 gpio_free(pdata->charge_gpio);
Marek Vasut7c879422009-07-23 16:02:08 +0200274 }
Tejun Heobc51e7f2010-12-11 17:51:45 +0100275 cancel_work_sync(&bat_work);
Marek Vašut4e9687d2008-09-11 19:37:32 +0100276 power_supply_unregister(&bat_ps);
277 kfree(prop);
278 return 0;
279}
280
281static struct platform_driver wm97xx_bat_driver = {
282 .driver = {
283 .name = "wm97xx-battery",
Marek Vasut83a8af02009-08-22 00:36:43 +0200284#ifdef CONFIG_PM
285 .pm = &wm97xx_bat_pm_ops,
286#endif
Marek Vašut4e9687d2008-09-11 19:37:32 +0100287 },
288 .probe = wm97xx_bat_probe,
Bill Pemberton28ea73f2012-11-19 13:20:40 -0500289 .remove = wm97xx_bat_remove,
Marek Vašut4e9687d2008-09-11 19:37:32 +0100290};
291
Axel Lin300bac72011-11-26 12:01:10 +0800292module_platform_driver(wm97xx_bat_driver);
Marek Vašut4e9687d2008-09-11 19:37:32 +0100293
294MODULE_LICENSE("GPL");
295MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
296MODULE_DESCRIPTION("WM97xx battery driver");