Commit | Line | Data |
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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> | |
7c87942a | 25 | #include <linux/irq.h> |
4e9687d9 MV |
26 | |
27 | static DEFINE_MUTEX(bat_lock); | |
28 | static struct work_struct bat_work; | |
29 | struct mutex work_lock; | |
30 | static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN; | |
b8bdc1d0 | 31 | static struct wm97xx_batt_info *gpdata; |
4e9687d9 MV |
32 | static enum power_supply_property *prop; |
33 | ||
34 | static unsigned long wm97xx_read_bat(struct power_supply *bat_ps) | |
35 | { | |
b8bdc1d0 MV |
36 | struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data; |
37 | struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata; | |
38 | ||
38c7dc37 | 39 | return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev->parent), |
4e9687d9 MV |
40 | pdata->batt_aux) * pdata->batt_mult / |
41 | pdata->batt_div; | |
42 | } | |
43 | ||
44 | static unsigned long wm97xx_read_temp(struct power_supply *bat_ps) | |
45 | { | |
b8bdc1d0 MV |
46 | struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data; |
47 | struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata; | |
48 | ||
38c7dc37 | 49 | return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev->parent), |
4e9687d9 MV |
50 | pdata->temp_aux) * pdata->temp_mult / |
51 | pdata->temp_div; | |
52 | } | |
53 | ||
54 | static int wm97xx_bat_get_property(struct power_supply *bat_ps, | |
55 | enum power_supply_property psp, | |
56 | union power_supply_propval *val) | |
57 | { | |
b8bdc1d0 MV |
58 | struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data; |
59 | struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata; | |
60 | ||
4e9687d9 MV |
61 | switch (psp) { |
62 | case POWER_SUPPLY_PROP_STATUS: | |
63 | val->intval = bat_status; | |
64 | break; | |
65 | case POWER_SUPPLY_PROP_TECHNOLOGY: | |
66 | val->intval = pdata->batt_tech; | |
67 | break; | |
68 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
69 | if (pdata->batt_aux >= 0) | |
70 | val->intval = wm97xx_read_bat(bat_ps); | |
71 | else | |
72 | return -EINVAL; | |
73 | break; | |
74 | case POWER_SUPPLY_PROP_TEMP: | |
75 | if (pdata->temp_aux >= 0) | |
76 | val->intval = wm97xx_read_temp(bat_ps); | |
77 | else | |
78 | return -EINVAL; | |
79 | break; | |
80 | case POWER_SUPPLY_PROP_VOLTAGE_MAX: | |
81 | if (pdata->max_voltage >= 0) | |
82 | val->intval = pdata->max_voltage; | |
83 | else | |
84 | return -EINVAL; | |
85 | break; | |
86 | case POWER_SUPPLY_PROP_VOLTAGE_MIN: | |
87 | if (pdata->min_voltage >= 0) | |
88 | val->intval = pdata->min_voltage; | |
89 | else | |
90 | return -EINVAL; | |
91 | break; | |
92 | case POWER_SUPPLY_PROP_PRESENT: | |
93 | val->intval = 1; | |
94 | break; | |
95 | default: | |
96 | return -EINVAL; | |
97 | } | |
98 | return 0; | |
99 | } | |
100 | ||
101 | static void wm97xx_bat_external_power_changed(struct power_supply *bat_ps) | |
102 | { | |
103 | schedule_work(&bat_work); | |
104 | } | |
105 | ||
106 | static void wm97xx_bat_update(struct power_supply *bat_ps) | |
107 | { | |
108 | int old_status = bat_status; | |
b8bdc1d0 MV |
109 | struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data; |
110 | struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata; | |
4e9687d9 MV |
111 | |
112 | mutex_lock(&work_lock); | |
113 | ||
114 | bat_status = (pdata->charge_gpio >= 0) ? | |
115 | (gpio_get_value(pdata->charge_gpio) ? | |
116 | POWER_SUPPLY_STATUS_DISCHARGING : | |
117 | POWER_SUPPLY_STATUS_CHARGING) : | |
118 | POWER_SUPPLY_STATUS_UNKNOWN; | |
119 | ||
120 | if (old_status != bat_status) { | |
121 | pr_debug("%s: %i -> %i\n", bat_ps->name, old_status, | |
122 | bat_status); | |
123 | power_supply_changed(bat_ps); | |
124 | } | |
125 | ||
126 | mutex_unlock(&work_lock); | |
127 | } | |
128 | ||
129 | static struct power_supply bat_ps = { | |
130 | .type = POWER_SUPPLY_TYPE_BATTERY, | |
131 | .get_property = wm97xx_bat_get_property, | |
132 | .external_power_changed = wm97xx_bat_external_power_changed, | |
133 | .use_for_apm = 1, | |
134 | }; | |
135 | ||
136 | static void wm97xx_bat_work(struct work_struct *work) | |
137 | { | |
138 | wm97xx_bat_update(&bat_ps); | |
139 | } | |
140 | ||
7c87942a MV |
141 | static irqreturn_t wm97xx_chrg_irq(int irq, void *data) |
142 | { | |
143 | schedule_work(&bat_work); | |
144 | return IRQ_HANDLED; | |
145 | } | |
146 | ||
4e9687d9 | 147 | #ifdef CONFIG_PM |
83a8af0d | 148 | static int wm97xx_bat_suspend(struct device *dev) |
4e9687d9 MV |
149 | { |
150 | flush_scheduled_work(); | |
151 | return 0; | |
152 | } | |
153 | ||
83a8af0d | 154 | static int wm97xx_bat_resume(struct device *dev) |
4e9687d9 MV |
155 | { |
156 | schedule_work(&bat_work); | |
157 | return 0; | |
158 | } | |
83a8af0d MV |
159 | |
160 | static struct dev_pm_ops wm97xx_bat_pm_ops = { | |
161 | .suspend = wm97xx_bat_suspend, | |
162 | .resume = wm97xx_bat_resume, | |
163 | }; | |
4e9687d9 MV |
164 | #endif |
165 | ||
166 | static int __devinit wm97xx_bat_probe(struct platform_device *dev) | |
167 | { | |
168 | int ret = 0; | |
169 | int props = 1; /* POWER_SUPPLY_PROP_PRESENT */ | |
170 | int i = 0; | |
b8bdc1d0 MV |
171 | struct wm97xx_pdata *wmdata = dev->dev.platform_data; |
172 | struct wm97xx_batt_pdata *pdata; | |
173 | ||
174 | if (gpdata) { | |
175 | dev_err(&dev->dev, "Do not pass platform_data through " | |
176 | "wm97xx_bat_set_pdata!\n"); | |
177 | return -EINVAL; | |
178 | } else | |
179 | pdata = wmdata->batt_pdata; | |
4e9687d9 MV |
180 | |
181 | if (dev->id != -1) | |
182 | return -EINVAL; | |
183 | ||
184 | mutex_init(&work_lock); | |
185 | ||
186 | if (!pdata) { | |
b8bdc1d0 | 187 | dev_err(&dev->dev, "No platform_data supplied\n"); |
4e9687d9 MV |
188 | return -EINVAL; |
189 | } | |
190 | ||
7c87942a | 191 | if (gpio_is_valid(pdata->charge_gpio)) { |
4e9687d9 MV |
192 | ret = gpio_request(pdata->charge_gpio, "BATT CHRG"); |
193 | if (ret) | |
194 | goto err; | |
195 | ret = gpio_direction_input(pdata->charge_gpio); | |
7c87942a MV |
196 | if (ret) |
197 | goto err2; | |
198 | ret = request_irq(gpio_to_irq(pdata->charge_gpio), | |
199 | wm97xx_chrg_irq, IRQF_DISABLED, | |
200 | "AC Detect", 0); | |
4e9687d9 MV |
201 | if (ret) |
202 | goto err2; | |
203 | props++; /* POWER_SUPPLY_PROP_STATUS */ | |
204 | } | |
205 | ||
206 | if (pdata->batt_tech >= 0) | |
207 | props++; /* POWER_SUPPLY_PROP_TECHNOLOGY */ | |
208 | if (pdata->temp_aux >= 0) | |
209 | props++; /* POWER_SUPPLY_PROP_TEMP */ | |
210 | if (pdata->batt_aux >= 0) | |
211 | props++; /* POWER_SUPPLY_PROP_VOLTAGE_NOW */ | |
212 | if (pdata->max_voltage >= 0) | |
213 | props++; /* POWER_SUPPLY_PROP_VOLTAGE_MAX */ | |
214 | if (pdata->min_voltage >= 0) | |
215 | props++; /* POWER_SUPPLY_PROP_VOLTAGE_MIN */ | |
216 | ||
217 | prop = kzalloc(props * sizeof(*prop), GFP_KERNEL); | |
218 | if (!prop) | |
7c87942a | 219 | goto err3; |
4e9687d9 MV |
220 | |
221 | prop[i++] = POWER_SUPPLY_PROP_PRESENT; | |
222 | if (pdata->charge_gpio >= 0) | |
223 | prop[i++] = POWER_SUPPLY_PROP_STATUS; | |
224 | if (pdata->batt_tech >= 0) | |
225 | prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY; | |
226 | if (pdata->temp_aux >= 0) | |
227 | prop[i++] = POWER_SUPPLY_PROP_TEMP; | |
228 | if (pdata->batt_aux >= 0) | |
229 | prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW; | |
230 | if (pdata->max_voltage >= 0) | |
231 | prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX; | |
232 | if (pdata->min_voltage >= 0) | |
233 | prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN; | |
234 | ||
235 | INIT_WORK(&bat_work, wm97xx_bat_work); | |
236 | ||
237 | if (!pdata->batt_name) { | |
238 | dev_info(&dev->dev, "Please consider setting proper battery " | |
239 | "name in platform definition file, falling " | |
240 | "back to name \"wm97xx-batt\"\n"); | |
241 | bat_ps.name = "wm97xx-batt"; | |
242 | } else | |
243 | bat_ps.name = pdata->batt_name; | |
244 | ||
245 | bat_ps.properties = prop; | |
246 | bat_ps.num_properties = props; | |
247 | ||
248 | ret = power_supply_register(&dev->dev, &bat_ps); | |
249 | if (!ret) | |
250 | schedule_work(&bat_work); | |
251 | else | |
7c87942a | 252 | goto err4; |
4e9687d9 MV |
253 | |
254 | return 0; | |
7c87942a | 255 | err4: |
4e9687d9 | 256 | kfree(prop); |
7c87942a MV |
257 | err3: |
258 | if (gpio_is_valid(pdata->charge_gpio)) | |
259 | free_irq(gpio_to_irq(pdata->charge_gpio), dev); | |
4e9687d9 | 260 | err2: |
7c87942a MV |
261 | if (gpio_is_valid(pdata->charge_gpio)) |
262 | gpio_free(pdata->charge_gpio); | |
4e9687d9 MV |
263 | err: |
264 | return ret; | |
265 | } | |
266 | ||
267 | static int __devexit wm97xx_bat_remove(struct platform_device *dev) | |
268 | { | |
b8bdc1d0 MV |
269 | struct wm97xx_pdata *wmdata = dev->dev.platform_data; |
270 | struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata; | |
271 | ||
7c87942a MV |
272 | if (pdata && gpio_is_valid(pdata->charge_gpio)) { |
273 | free_irq(gpio_to_irq(pdata->charge_gpio), dev); | |
4e9687d9 | 274 | gpio_free(pdata->charge_gpio); |
7c87942a | 275 | } |
4e9687d9 MV |
276 | flush_scheduled_work(); |
277 | power_supply_unregister(&bat_ps); | |
278 | kfree(prop); | |
279 | return 0; | |
280 | } | |
281 | ||
282 | static struct platform_driver wm97xx_bat_driver = { | |
283 | .driver = { | |
284 | .name = "wm97xx-battery", | |
285 | .owner = THIS_MODULE, | |
83a8af0d MV |
286 | #ifdef CONFIG_PM |
287 | .pm = &wm97xx_bat_pm_ops, | |
288 | #endif | |
4e9687d9 MV |
289 | }, |
290 | .probe = wm97xx_bat_probe, | |
291 | .remove = __devexit_p(wm97xx_bat_remove), | |
4e9687d9 MV |
292 | }; |
293 | ||
294 | static int __init wm97xx_bat_init(void) | |
295 | { | |
296 | return platform_driver_register(&wm97xx_bat_driver); | |
297 | } | |
298 | ||
299 | static void __exit wm97xx_bat_exit(void) | |
300 | { | |
301 | platform_driver_unregister(&wm97xx_bat_driver); | |
302 | } | |
303 | ||
b8bdc1d0 | 304 | void wm97xx_bat_set_pdata(struct wm97xx_batt_info *data) |
4e9687d9 | 305 | { |
b8bdc1d0 | 306 | gpdata = data; |
4e9687d9 MV |
307 | } |
308 | EXPORT_SYMBOL_GPL(wm97xx_bat_set_pdata); | |
309 | ||
310 | module_init(wm97xx_bat_init); | |
311 | module_exit(wm97xx_bat_exit); | |
312 | ||
313 | MODULE_LICENSE("GPL"); | |
314 | MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>"); | |
315 | MODULE_DESCRIPTION("WM97xx battery driver"); |