Root/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
28static struct work_struct bat_work;
29static DEFINE_MUTEX(work_lock);
30static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
31static enum power_supply_property *prop;
32
33static 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
43static 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
53static 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
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;
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
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
140static 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
147static int wm97xx_bat_suspend(struct device *dev)
148{
149    flush_work_sync(&bat_work);
150    return 0;
151}
152
153static int wm97xx_bat_resume(struct device *dev)
154{
155    schedule_work(&bat_work);
156    return 0;
157}
158
159static const struct dev_pm_ops wm97xx_bat_pm_ops = {
160    .suspend = wm97xx_bat_suspend,
161    .resume = wm97xx_bat_resume,
162};
163#endif
164
165static 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;
252err4:
253    kfree(prop);
254err3:
255    if (gpio_is_valid(pdata->charge_gpio))
256        free_irq(gpio_to_irq(pdata->charge_gpio), dev);
257err2:
258    if (gpio_is_valid(pdata->charge_gpio))
259        gpio_free(pdata->charge_gpio);
260err:
261    return ret;
262}
263
264static 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
279static 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
291module_platform_driver(wm97xx_bat_driver);
292
293MODULE_LICENSE("GPL");
294MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
295MODULE_DESCRIPTION("WM97xx battery driver");
296

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