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path: root/drivers/power/supply/wm97xx_battery.c
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Diffstat (limited to 'drivers/power/supply/wm97xx_battery.c')
-rw-r--r--drivers/power/supply/wm97xx_battery.c297
1 files changed, 297 insertions, 0 deletions
diff --git a/drivers/power/supply/wm97xx_battery.c b/drivers/power/supply/wm97xx_battery.c
new file mode 100644
index 000000000000..6285626d142a
--- /dev/null
+++ b/drivers/power/supply/wm97xx_battery.c
@@ -0,0 +1,297 @@
1/*
2 * Battery measurement code for WM97xx
3 *
4 * based on tosa_battery.c
5 *
6 * Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
7 *
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.
11 *
12 */
13
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>
25
26static struct work_struct bat_work;
27static DEFINE_MUTEX(work_lock);
28static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
29static enum power_supply_property *prop;
30
31static unsigned long wm97xx_read_bat(struct power_supply *bat_ps)
32{
33 struct wm97xx_pdata *wmdata = bat_ps->dev.parent->platform_data;
34 struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
35
36 return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev.parent),
37 pdata->batt_aux) * pdata->batt_mult /
38 pdata->batt_div;
39}
40
41static unsigned long wm97xx_read_temp(struct power_supply *bat_ps)
42{
43 struct wm97xx_pdata *wmdata = bat_ps->dev.parent->platform_data;
44 struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
45
46 return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev.parent),
47 pdata->temp_aux) * pdata->temp_mult /
48 pdata->temp_div;
49}
50
51static int wm97xx_bat_get_property(struct power_supply *bat_ps,
52 enum power_supply_property psp,
53 union power_supply_propval *val)
54{
55 struct wm97xx_pdata *wmdata = bat_ps->dev.parent->platform_data;
56 struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
57
58 switch (psp) {
59 case POWER_SUPPLY_PROP_STATUS:
60 val->intval = bat_status;
61 break;
62 case POWER_SUPPLY_PROP_TECHNOLOGY:
63 val->intval = pdata->batt_tech;
64 break;
65 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
66 if (pdata->batt_aux >= 0)
67 val->intval = wm97xx_read_bat(bat_ps);
68 else
69 return -EINVAL;
70 break;
71 case POWER_SUPPLY_PROP_TEMP:
72 if (pdata->temp_aux >= 0)
73 val->intval = wm97xx_read_temp(bat_ps);
74 else
75 return -EINVAL;
76 break;
77 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
78 if (pdata->max_voltage >= 0)
79 val->intval = pdata->max_voltage;
80 else
81 return -EINVAL;
82 break;
83 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
84 if (pdata->min_voltage >= 0)
85 val->intval = pdata->min_voltage;
86 else
87 return -EINVAL;
88 break;
89 case POWER_SUPPLY_PROP_PRESENT:
90 val->intval = 1;
91 break;
92 default:
93 return -EINVAL;
94 }
95 return 0;
96}
97
98static void wm97xx_bat_external_power_changed(struct power_supply *bat_ps)
99{
100 schedule_work(&bat_work);
101}
102
103static void wm97xx_bat_update(struct power_supply *bat_ps)
104{
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;
108
109 mutex_lock(&work_lock);
110
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;
116
117 if (old_status != bat_status) {
118 pr_debug("%s: %i -> %i\n", bat_ps->desc->name, old_status,
119 bat_status);
120 power_supply_changed(bat_ps);
121 }
122
123 mutex_unlock(&work_lock);
124}
125
126static struct power_supply *bat_psy;
127static 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,
131 .use_for_apm = 1,
132};
133
134static void wm97xx_bat_work(struct work_struct *work)
135{
136 wm97xx_bat_update(bat_psy);
137}
138
139static irqreturn_t wm97xx_chrg_irq(int irq, void *data)
140{
141 schedule_work(&bat_work);
142 return IRQ_HANDLED;
143}
144
145#ifdef CONFIG_PM
146static int wm97xx_bat_suspend(struct device *dev)
147{
148 flush_work(&bat_work);
149 return 0;
150}
151
152static int wm97xx_bat_resume(struct device *dev)
153{
154 schedule_work(&bat_work);
155 return 0;
156}
157
158static const struct dev_pm_ops wm97xx_bat_pm_ops = {
159 .suspend = wm97xx_bat_suspend,
160 .resume = wm97xx_bat_resume,
161};
162#endif
163
164static int wm97xx_bat_probe(struct platform_device *dev)
165{
166 int ret = 0;
167 int props = 1; /* POWER_SUPPLY_PROP_PRESENT */
168 int i = 0;
169 struct wm97xx_pdata *wmdata = dev->dev.platform_data;
170 struct wm97xx_batt_pdata *pdata;
171
172 if (!wmdata) {
173 dev_err(&dev->dev, "No platform data supplied\n");
174 return -EINVAL;
175 }
176
177 pdata = wmdata->batt_pdata;
178
179 if (dev->id != -1)
180 return -EINVAL;
181
182 if (!pdata) {
183 dev_err(&dev->dev, "No platform_data supplied\n");
184 return -EINVAL;
185 }
186
187 if (gpio_is_valid(pdata->charge_gpio)) {
188 ret = gpio_request(pdata->charge_gpio, "BATT CHRG");
189 if (ret)
190 goto err;
191 ret = gpio_direction_input(pdata->charge_gpio);
192 if (ret)
193 goto err2;
194 ret = request_irq(gpio_to_irq(pdata->charge_gpio),
195 wm97xx_chrg_irq, 0,
196 "AC Detect", dev);
197 if (ret)
198 goto err2;
199 props++; /* POWER_SUPPLY_PROP_STATUS */
200 }
201
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 */
212
213 prop = kzalloc(props * sizeof(*prop), GFP_KERNEL);
214 if (!prop) {
215 ret = -ENOMEM;
216 goto err3;
217 }
218
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;
232
233 INIT_WORK(&bat_work, wm97xx_bat_work);
234
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";
240 } else
241 bat_psy_desc.name = pdata->batt_name;
242
243 bat_psy_desc.properties = prop;
244 bat_psy_desc.num_properties = props;
245
246 bat_psy = power_supply_register(&dev->dev, &bat_psy_desc, NULL);
247 if (!IS_ERR(bat_psy)) {
248 schedule_work(&bat_work);
249 } else {
250 ret = PTR_ERR(bat_psy);
251 goto err4;
252 }
253
254 return 0;
255err4:
256 kfree(prop);
257err3:
258 if (gpio_is_valid(pdata->charge_gpio))
259 free_irq(gpio_to_irq(pdata->charge_gpio), dev);
260err2:
261 if (gpio_is_valid(pdata->charge_gpio))
262 gpio_free(pdata->charge_gpio);
263err:
264 return ret;
265}
266
267static int wm97xx_bat_remove(struct platform_device *dev)
268{
269 struct wm97xx_pdata *wmdata = dev->dev.platform_data;
270 struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
271
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);
275 }
276 cancel_work_sync(&bat_work);
277 power_supply_unregister(bat_psy);
278 kfree(prop);
279 return 0;
280}
281
282static struct platform_driver wm97xx_bat_driver = {
283 .driver = {
284 .name = "wm97xx-battery",
285#ifdef CONFIG_PM
286 .pm = &wm97xx_bat_pm_ops,
287#endif
288 },
289 .probe = wm97xx_bat_probe,
290 .remove = wm97xx_bat_remove,
291};
292
293module_platform_driver(wm97xx_bat_driver);
294
295MODULE_LICENSE("GPL");
296MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
297MODULE_DESCRIPTION("WM97xx battery driver");
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-17 06:44:21 -0500