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10#include <linux/init.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/platform_device.h>
14#include <linux/power_supply.h>
15#include <linux/wm97xx.h>
16#include <linux/spinlock.h>
17#include <linux/interrupt.h>
18#include <linux/gpio.h>
19#include <linux/irq.h>
20#include <linux/slab.h>
21
22static struct work_struct bat_work;
23static DEFINE_MUTEX(work_lock);
24static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
25static enum power_supply_property *prop;
26
27static unsigned long wm97xx_read_bat(struct power_supply *bat_ps)
28{
29 struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);
30
31 return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev.parent),
32 pdata->batt_aux) * pdata->batt_mult /
33 pdata->batt_div;
34}
35
36static unsigned long wm97xx_read_temp(struct power_supply *bat_ps)
37{
38 struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);
39
40 return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev.parent),
41 pdata->temp_aux) * pdata->temp_mult /
42 pdata->temp_div;
43}
44
45static int wm97xx_bat_get_property(struct power_supply *bat_ps,
46 enum power_supply_property psp,
47 union power_supply_propval *val)
48{
49 struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);
50
51 switch (psp) {
52 case POWER_SUPPLY_PROP_STATUS:
53 val->intval = bat_status;
54 break;
55 case POWER_SUPPLY_PROP_TECHNOLOGY:
56 val->intval = pdata->batt_tech;
57 break;
58 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
59 if (pdata->batt_aux >= 0)
60 val->intval = wm97xx_read_bat(bat_ps);
61 else
62 return -EINVAL;
63 break;
64 case POWER_SUPPLY_PROP_TEMP:
65 if (pdata->temp_aux >= 0)
66 val->intval = wm97xx_read_temp(bat_ps);
67 else
68 return -EINVAL;
69 break;
70 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
71 if (pdata->max_voltage >= 0)
72 val->intval = pdata->max_voltage;
73 else
74 return -EINVAL;
75 break;
76 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
77 if (pdata->min_voltage >= 0)
78 val->intval = pdata->min_voltage;
79 else
80 return -EINVAL;
81 break;
82 case POWER_SUPPLY_PROP_PRESENT:
83 val->intval = 1;
84 break;
85 default:
86 return -EINVAL;
87 }
88 return 0;
89}
90
91static void wm97xx_bat_external_power_changed(struct power_supply *bat_ps)
92{
93 schedule_work(&bat_work);
94}
95
96static void wm97xx_bat_update(struct power_supply *bat_ps)
97{
98 int old_status = bat_status;
99 struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);
100
101 mutex_lock(&work_lock);
102
103 bat_status = (pdata->charge_gpio >= 0) ?
104 (gpio_get_value(pdata->charge_gpio) ?
105 POWER_SUPPLY_STATUS_DISCHARGING :
106 POWER_SUPPLY_STATUS_CHARGING) :
107 POWER_SUPPLY_STATUS_UNKNOWN;
108
109 if (old_status != bat_status) {
110 pr_debug("%s: %i -> %i\n", bat_ps->desc->name, old_status,
111 bat_status);
112 power_supply_changed(bat_ps);
113 }
114
115 mutex_unlock(&work_lock);
116}
117
118static struct power_supply *bat_psy;
119static struct power_supply_desc bat_psy_desc = {
120 .type = POWER_SUPPLY_TYPE_BATTERY,
121 .get_property = wm97xx_bat_get_property,
122 .external_power_changed = wm97xx_bat_external_power_changed,
123 .use_for_apm = 1,
124};
125
126static void wm97xx_bat_work(struct work_struct *work)
127{
128 wm97xx_bat_update(bat_psy);
129}
130
131static irqreturn_t wm97xx_chrg_irq(int irq, void *data)
132{
133 schedule_work(&bat_work);
134 return IRQ_HANDLED;
135}
136
137#ifdef CONFIG_PM
138static int wm97xx_bat_suspend(struct device *dev)
139{
140 flush_work(&bat_work);
141 return 0;
142}
143
144static int wm97xx_bat_resume(struct device *dev)
145{
146 schedule_work(&bat_work);
147 return 0;
148}
149
150static const struct dev_pm_ops wm97xx_bat_pm_ops = {
151 .suspend = wm97xx_bat_suspend,
152 .resume = wm97xx_bat_resume,
153};
154#endif
155
156static int wm97xx_bat_probe(struct platform_device *dev)
157{
158 int ret = 0;
159 int props = 1;
160 int i = 0;
161 struct wm97xx_batt_pdata *pdata = dev->dev.platform_data;
162 struct power_supply_config cfg = {};
163
164 if (!pdata) {
165 dev_err(&dev->dev, "No platform data supplied\n");
166 return -EINVAL;
167 }
168
169 cfg.drv_data = pdata;
170
171 if (dev->id != -1)
172 return -EINVAL;
173
174 if (gpio_is_valid(pdata->charge_gpio)) {
175 ret = gpio_request(pdata->charge_gpio, "BATT CHRG");
176 if (ret)
177 goto err;
178 ret = gpio_direction_input(pdata->charge_gpio);
179 if (ret)
180 goto err2;
181 ret = request_irq(gpio_to_irq(pdata->charge_gpio),
182 wm97xx_chrg_irq, 0,
183 "AC Detect", dev);
184 if (ret)
185 goto err2;
186 props++;
187 }
188
189 if (pdata->batt_tech >= 0)
190 props++;
191 if (pdata->temp_aux >= 0)
192 props++;
193 if (pdata->batt_aux >= 0)
194 props++;
195 if (pdata->max_voltage >= 0)
196 props++;
197 if (pdata->min_voltage >= 0)
198 props++;
199
200 prop = kcalloc(props, sizeof(*prop), GFP_KERNEL);
201 if (!prop) {
202 ret = -ENOMEM;
203 goto err3;
204 }
205
206 prop[i++] = POWER_SUPPLY_PROP_PRESENT;
207 if (pdata->charge_gpio >= 0)
208 prop[i++] = POWER_SUPPLY_PROP_STATUS;
209 if (pdata->batt_tech >= 0)
210 prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
211 if (pdata->temp_aux >= 0)
212 prop[i++] = POWER_SUPPLY_PROP_TEMP;
213 if (pdata->batt_aux >= 0)
214 prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW;
215 if (pdata->max_voltage >= 0)
216 prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX;
217 if (pdata->min_voltage >= 0)
218 prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN;
219
220 INIT_WORK(&bat_work, wm97xx_bat_work);
221
222 if (!pdata->batt_name) {
223 dev_info(&dev->dev, "Please consider setting proper battery "
224 "name in platform definition file, falling "
225 "back to name \"wm97xx-batt\"\n");
226 bat_psy_desc.name = "wm97xx-batt";
227 } else
228 bat_psy_desc.name = pdata->batt_name;
229
230 bat_psy_desc.properties = prop;
231 bat_psy_desc.num_properties = props;
232
233 bat_psy = power_supply_register(&dev->dev, &bat_psy_desc, &cfg);
234 if (!IS_ERR(bat_psy)) {
235 schedule_work(&bat_work);
236 } else {
237 ret = PTR_ERR(bat_psy);
238 goto err4;
239 }
240
241 return 0;
242err4:
243 kfree(prop);
244err3:
245 if (gpio_is_valid(pdata->charge_gpio))
246 free_irq(gpio_to_irq(pdata->charge_gpio), dev);
247err2:
248 if (gpio_is_valid(pdata->charge_gpio))
249 gpio_free(pdata->charge_gpio);
250err:
251 return ret;
252}
253
254static int wm97xx_bat_remove(struct platform_device *dev)
255{
256 struct wm97xx_batt_pdata *pdata = dev->dev.platform_data;
257
258 if (pdata && gpio_is_valid(pdata->charge_gpio)) {
259 free_irq(gpio_to_irq(pdata->charge_gpio), dev);
260 gpio_free(pdata->charge_gpio);
261 }
262 cancel_work_sync(&bat_work);
263 power_supply_unregister(bat_psy);
264 kfree(prop);
265 return 0;
266}
267
268static struct platform_driver wm97xx_bat_driver = {
269 .driver = {
270 .name = "wm97xx-battery",
271#ifdef CONFIG_PM
272 .pm = &wm97xx_bat_pm_ops,
273#endif
274 },
275 .probe = wm97xx_bat_probe,
276 .remove = wm97xx_bat_remove,
277};
278
279module_platform_driver(wm97xx_bat_driver);
280
281MODULE_LICENSE("GPL");
282MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
283MODULE_DESCRIPTION("WM97xx battery driver");
284
