drm/i915: SDVO hotplug have different interrupt status bits for i915/i965/g4x
[linux-2.6.git] / drivers / power / wm97xx_battery.c
1 /*
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>
25 #include <linux/irq.h>
26 #include <linux/slab.h>
27
28 static struct work_struct bat_work;
29 static DEFINE_MUTEX(work_lock);
30 static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
31 static enum power_supply_property *prop;
32
33 static unsigned long wm97xx_read_bat(struct power_supply *bat_ps)
34 {
35         struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
36         struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
37
38         return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev->parent),
39                                         pdata->batt_aux) * pdata->batt_mult /
40                                         pdata->batt_div;
41 }
42
43 static unsigned long wm97xx_read_temp(struct power_supply *bat_ps)
44 {
45         struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
46         struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
47
48         return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev->parent),
49                                         pdata->temp_aux) * pdata->temp_mult /
50                                         pdata->temp_div;
51 }
52
53 static int wm97xx_bat_get_property(struct power_supply *bat_ps,
54                             enum power_supply_property psp,
55                             union power_supply_propval *val)
56 {
57         struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
58         struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
59
60         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
100 static void wm97xx_bat_external_power_changed(struct power_supply *bat_ps)
101 {
102         schedule_work(&bat_work);
103 }
104
105 static void wm97xx_bat_update(struct power_supply *bat_ps)
106 {
107         int old_status = bat_status;
108         struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
109         struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
110
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
128 static 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
135 static void wm97xx_bat_work(struct work_struct *work)
136 {
137         wm97xx_bat_update(&bat_ps);
138 }
139
140 static irqreturn_t wm97xx_chrg_irq(int irq, void *data)
141 {
142         schedule_work(&bat_work);
143         return IRQ_HANDLED;
144 }
145
146 #ifdef CONFIG_PM
147 static int wm97xx_bat_suspend(struct device *dev)
148 {
149         flush_work_sync(&bat_work);
150         return 0;
151 }
152
153 static int wm97xx_bat_resume(struct device *dev)
154 {
155         schedule_work(&bat_work);
156         return 0;
157 }
158
159 static const struct dev_pm_ops wm97xx_bat_pm_ops = {
160         .suspend        = wm97xx_bat_suspend,
161         .resume         = wm97xx_bat_resume,
162 };
163 #endif
164
165 static int __devinit wm97xx_bat_probe(struct platform_device *dev)
166 {
167         int ret = 0;
168         int props = 1;  /* POWER_SUPPLY_PROP_PRESENT */
169         int i = 0;
170         struct wm97xx_pdata *wmdata = dev->dev.platform_data;
171         struct wm97xx_batt_pdata *pdata;
172
173         if (!wmdata) {
174                 dev_err(&dev->dev, "No platform data supplied\n");
175                 return -EINVAL;
176         }
177
178         pdata = wmdata->batt_pdata;
179
180         if (dev->id != -1)
181                 return -EINVAL;
182
183         if (!pdata) {
184                 dev_err(&dev->dev, "No platform_data supplied\n");
185                 return -EINVAL;
186         }
187
188         if (gpio_is_valid(pdata->charge_gpio)) {
189                 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;
195                 ret = request_irq(gpio_to_irq(pdata->charge_gpio),
196                                 wm97xx_chrg_irq, 0,
197                                 "AC Detect", dev);
198                 if (ret)
199                         goto err2;
200                 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);
215         if (!prop)
216                 goto err3;
217
218         prop[i++] = POWER_SUPPLY_PROP_PRESENT;
219         if (pdata->charge_gpio >= 0)
220                 prop[i++] = POWER_SUPPLY_PROP_STATUS;
221         if (pdata->batt_tech >= 0)
222                 prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
223         if (pdata->temp_aux >= 0)
224                 prop[i++] = POWER_SUPPLY_PROP_TEMP;
225         if (pdata->batt_aux >= 0)
226                 prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW;
227         if (pdata->max_voltage >= 0)
228                 prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX;
229         if (pdata->min_voltage >= 0)
230                 prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN;
231
232         INIT_WORK(&bat_work, wm97xx_bat_work);
233
234         if (!pdata->batt_name) {
235                 dev_info(&dev->dev, "Please consider setting proper battery "
236                                 "name in platform definition file, falling "
237                                 "back to name \"wm97xx-batt\"\n");
238                 bat_ps.name = "wm97xx-batt";
239         } else
240                 bat_ps.name = pdata->batt_name;
241
242         bat_ps.properties = prop;
243         bat_ps.num_properties = props;
244
245         ret = power_supply_register(&dev->dev, &bat_ps);
246         if (!ret)
247                 schedule_work(&bat_work);
248         else
249                 goto err4;
250
251         return 0;
252 err4:
253         kfree(prop);
254 err3:
255         if (gpio_is_valid(pdata->charge_gpio))
256                 free_irq(gpio_to_irq(pdata->charge_gpio), dev);
257 err2:
258         if (gpio_is_valid(pdata->charge_gpio))
259                 gpio_free(pdata->charge_gpio);
260 err:
261         return ret;
262 }
263
264 static int __devexit wm97xx_bat_remove(struct platform_device *dev)
265 {
266         struct wm97xx_pdata *wmdata = dev->dev.platform_data;
267         struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
268
269         if (pdata && gpio_is_valid(pdata->charge_gpio)) {
270                 free_irq(gpio_to_irq(pdata->charge_gpio), dev);
271                 gpio_free(pdata->charge_gpio);
272         }
273         cancel_work_sync(&bat_work);
274         power_supply_unregister(&bat_ps);
275         kfree(prop);
276         return 0;
277 }
278
279 static struct platform_driver wm97xx_bat_driver = {
280         .driver = {
281                 .name   = "wm97xx-battery",
282                 .owner  = THIS_MODULE,
283 #ifdef CONFIG_PM
284                 .pm     = &wm97xx_bat_pm_ops,
285 #endif
286         },
287         .probe          = wm97xx_bat_probe,
288         .remove         = __devexit_p(wm97xx_bat_remove),
289 };
290
291 module_platform_driver(wm97xx_bat_driver);
292
293 MODULE_LICENSE("GPL");
294 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
295 MODULE_DESCRIPTION("WM97xx battery driver");