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4e9687d9 MV |
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> | |
4e9687d9 MV |
25 | |
26 | static DEFINE_MUTEX(bat_lock); | |
27 | static struct work_struct bat_work; | |
28 | struct mutex work_lock; | |
29 | static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN; | |
b8bdc1d0 | 30 | static struct wm97xx_batt_info *gpdata; |
4e9687d9 MV |
31 | static enum power_supply_property *prop; |
32 | ||
33 | static unsigned long wm97xx_read_bat(struct power_supply *bat_ps) | |
34 | { | |
b8bdc1d0 MV |
35 | struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data; |
36 | struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata; | |
37 | ||
4e9687d9 MV |
38 | return wm97xx_read_aux_adc(bat_ps->dev->parent->driver_data, |
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 | { | |
b8bdc1d0 MV |
45 | struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data; |
46 | struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata; | |
47 | ||
4e9687d9 MV |
48 | return wm97xx_read_aux_adc(bat_ps->dev->parent->driver_data, |
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 | { | |
b8bdc1d0 MV |
57 | struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data; |
58 | struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata; | |
59 | ||
4e9687d9 MV |
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; | |
b8bdc1d0 MV |
108 | struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data; |
109 | struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata; | |
4e9687d9 MV |
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 | #ifdef CONFIG_PM | |
141 | static int wm97xx_bat_suspend(struct platform_device *dev, pm_message_t state) | |
142 | { | |
143 | flush_scheduled_work(); | |
144 | return 0; | |
145 | } | |
146 | ||
147 | static int wm97xx_bat_resume(struct platform_device *dev) | |
148 | { | |
149 | schedule_work(&bat_work); | |
150 | return 0; | |
151 | } | |
152 | #else | |
153 | #define wm97xx_bat_suspend NULL | |
154 | #define wm97xx_bat_resume NULL | |
155 | #endif | |
156 | ||
157 | static int __devinit wm97xx_bat_probe(struct platform_device *dev) | |
158 | { | |
159 | int ret = 0; | |
160 | int props = 1; /* POWER_SUPPLY_PROP_PRESENT */ | |
161 | int i = 0; | |
b8bdc1d0 MV |
162 | struct wm97xx_pdata *wmdata = dev->dev.platform_data; |
163 | struct wm97xx_batt_pdata *pdata; | |
164 | ||
165 | if (gpdata) { | |
166 | dev_err(&dev->dev, "Do not pass platform_data through " | |
167 | "wm97xx_bat_set_pdata!\n"); | |
168 | return -EINVAL; | |
169 | } else | |
170 | pdata = wmdata->batt_pdata; | |
4e9687d9 MV |
171 | |
172 | if (dev->id != -1) | |
173 | return -EINVAL; | |
174 | ||
175 | mutex_init(&work_lock); | |
176 | ||
177 | if (!pdata) { | |
b8bdc1d0 | 178 | dev_err(&dev->dev, "No platform_data supplied\n"); |
4e9687d9 MV |
179 | return -EINVAL; |
180 | } | |
181 | ||
182 | if (pdata->charge_gpio >= 0 && gpio_is_valid(pdata->charge_gpio)) { | |
183 | ret = gpio_request(pdata->charge_gpio, "BATT CHRG"); | |
184 | if (ret) | |
185 | goto err; | |
186 | ret = gpio_direction_input(pdata->charge_gpio); | |
187 | if (ret) | |
188 | goto err2; | |
189 | props++; /* POWER_SUPPLY_PROP_STATUS */ | |
190 | } | |
191 | ||
192 | if (pdata->batt_tech >= 0) | |
193 | props++; /* POWER_SUPPLY_PROP_TECHNOLOGY */ | |
194 | if (pdata->temp_aux >= 0) | |
195 | props++; /* POWER_SUPPLY_PROP_TEMP */ | |
196 | if (pdata->batt_aux >= 0) | |
197 | props++; /* POWER_SUPPLY_PROP_VOLTAGE_NOW */ | |
198 | if (pdata->max_voltage >= 0) | |
199 | props++; /* POWER_SUPPLY_PROP_VOLTAGE_MAX */ | |
200 | if (pdata->min_voltage >= 0) | |
201 | props++; /* POWER_SUPPLY_PROP_VOLTAGE_MIN */ | |
202 | ||
203 | prop = kzalloc(props * sizeof(*prop), GFP_KERNEL); | |
204 | if (!prop) | |
205 | goto err2; | |
206 | ||
207 | prop[i++] = POWER_SUPPLY_PROP_PRESENT; | |
208 | if (pdata->charge_gpio >= 0) | |
209 | prop[i++] = POWER_SUPPLY_PROP_STATUS; | |
210 | if (pdata->batt_tech >= 0) | |
211 | prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY; | |
212 | if (pdata->temp_aux >= 0) | |
213 | prop[i++] = POWER_SUPPLY_PROP_TEMP; | |
214 | if (pdata->batt_aux >= 0) | |
215 | prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW; | |
216 | if (pdata->max_voltage >= 0) | |
217 | prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX; | |
218 | if (pdata->min_voltage >= 0) | |
219 | prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN; | |
220 | ||
221 | INIT_WORK(&bat_work, wm97xx_bat_work); | |
222 | ||
223 | if (!pdata->batt_name) { | |
224 | dev_info(&dev->dev, "Please consider setting proper battery " | |
225 | "name in platform definition file, falling " | |
226 | "back to name \"wm97xx-batt\"\n"); | |
227 | bat_ps.name = "wm97xx-batt"; | |
228 | } else | |
229 | bat_ps.name = pdata->batt_name; | |
230 | ||
231 | bat_ps.properties = prop; | |
232 | bat_ps.num_properties = props; | |
233 | ||
234 | ret = power_supply_register(&dev->dev, &bat_ps); | |
235 | if (!ret) | |
236 | schedule_work(&bat_work); | |
237 | else | |
238 | goto err3; | |
239 | ||
240 | return 0; | |
241 | err3: | |
242 | kfree(prop); | |
243 | err2: | |
244 | gpio_free(pdata->charge_gpio); | |
245 | err: | |
246 | return ret; | |
247 | } | |
248 | ||
249 | static int __devexit wm97xx_bat_remove(struct platform_device *dev) | |
250 | { | |
b8bdc1d0 MV |
251 | struct wm97xx_pdata *wmdata = dev->dev.platform_data; |
252 | struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata; | |
253 | ||
4e9687d9 MV |
254 | if (pdata && pdata->charge_gpio && pdata->charge_gpio >= 0) |
255 | gpio_free(pdata->charge_gpio); | |
256 | flush_scheduled_work(); | |
257 | power_supply_unregister(&bat_ps); | |
258 | kfree(prop); | |
259 | return 0; | |
260 | } | |
261 | ||
262 | static struct platform_driver wm97xx_bat_driver = { | |
263 | .driver = { | |
264 | .name = "wm97xx-battery", | |
265 | .owner = THIS_MODULE, | |
266 | }, | |
267 | .probe = wm97xx_bat_probe, | |
268 | .remove = __devexit_p(wm97xx_bat_remove), | |
269 | .suspend = wm97xx_bat_suspend, | |
270 | .resume = wm97xx_bat_resume, | |
271 | }; | |
272 | ||
273 | static int __init wm97xx_bat_init(void) | |
274 | { | |
275 | return platform_driver_register(&wm97xx_bat_driver); | |
276 | } | |
277 | ||
278 | static void __exit wm97xx_bat_exit(void) | |
279 | { | |
280 | platform_driver_unregister(&wm97xx_bat_driver); | |
281 | } | |
282 | ||
b8bdc1d0 | 283 | void wm97xx_bat_set_pdata(struct wm97xx_batt_info *data) |
4e9687d9 | 284 | { |
b8bdc1d0 | 285 | gpdata = data; |
4e9687d9 MV |
286 | } |
287 | EXPORT_SYMBOL_GPL(wm97xx_bat_set_pdata); | |
288 | ||
289 | module_init(wm97xx_bat_init); | |
290 | module_exit(wm97xx_bat_exit); | |
291 | ||
292 | MODULE_LICENSE("GPL"); | |
293 | MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>"); | |
294 | MODULE_DESCRIPTION("WM97xx battery driver"); |