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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> |
5a0e3ad6 | 26 | #include <linux/slab.h> |
4e9687d9 | 27 | |
4e9687d9 | 28 | static struct work_struct bat_work; |
daf22c3c | 29 | static DEFINE_MUTEX(work_lock); |
4e9687d9 | 30 | static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN; |
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 | ||
38c7dc37 | 38 | return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev->parent), |
4e9687d9 MV |
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 | ||
38c7dc37 | 48 | return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev->parent), |
4e9687d9 MV |
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 | ||
7c87942a MV |
140 | static irqreturn_t wm97xx_chrg_irq(int irq, void *data) |
141 | { | |
142 | schedule_work(&bat_work); | |
143 | return IRQ_HANDLED; | |
144 | } | |
145 | ||
4e9687d9 | 146 | #ifdef CONFIG_PM |
83a8af0d | 147 | static int wm97xx_bat_suspend(struct device *dev) |
4e9687d9 | 148 | { |
43829731 | 149 | flush_work(&bat_work); |
4e9687d9 MV |
150 | return 0; |
151 | } | |
152 | ||
83a8af0d | 153 | static int wm97xx_bat_resume(struct device *dev) |
4e9687d9 MV |
154 | { |
155 | schedule_work(&bat_work); | |
156 | return 0; | |
157 | } | |
83a8af0d | 158 | |
47145210 | 159 | static const struct dev_pm_ops wm97xx_bat_pm_ops = { |
83a8af0d MV |
160 | .suspend = wm97xx_bat_suspend, |
161 | .resume = wm97xx_bat_resume, | |
162 | }; | |
4e9687d9 MV |
163 | #endif |
164 | ||
c8afa640 | 165 | static int wm97xx_bat_probe(struct platform_device *dev) |
4e9687d9 MV |
166 | { |
167 | int ret = 0; | |
168 | int props = 1; /* POWER_SUPPLY_PROP_PRESENT */ | |
169 | int i = 0; | |
b8bdc1d0 MV |
170 | struct wm97xx_pdata *wmdata = dev->dev.platform_data; |
171 | struct wm97xx_batt_pdata *pdata; | |
172 | ||
12b336a8 MB |
173 | if (!wmdata) { |
174 | dev_err(&dev->dev, "No platform data supplied\n"); | |
175 | return -EINVAL; | |
176 | } | |
177 | ||
178 | pdata = wmdata->batt_pdata; | |
4e9687d9 MV |
179 | |
180 | if (dev->id != -1) | |
181 | return -EINVAL; | |
182 | ||
4e9687d9 | 183 | if (!pdata) { |
b8bdc1d0 | 184 | dev_err(&dev->dev, "No platform_data supplied\n"); |
4e9687d9 MV |
185 | return -EINVAL; |
186 | } | |
187 | ||
7c87942a | 188 | if (gpio_is_valid(pdata->charge_gpio)) { |
4e9687d9 MV |
189 | ret = gpio_request(pdata->charge_gpio, "BATT CHRG"); |
190 | if (ret) | |
191 | goto err; | |
192 | ret = gpio_direction_input(pdata->charge_gpio); | |
7c87942a MV |
193 | if (ret) |
194 | goto err2; | |
195 | ret = request_irq(gpio_to_irq(pdata->charge_gpio), | |
3b176b25 | 196 | wm97xx_chrg_irq, 0, |
f8d94eb7 | 197 | "AC Detect", dev); |
4e9687d9 MV |
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); | |
588d4f0b JL |
215 | if (!prop) { |
216 | ret = -ENOMEM; | |
7c87942a | 217 | goto err3; |
588d4f0b | 218 | } |
4e9687d9 MV |
219 | |
220 | prop[i++] = POWER_SUPPLY_PROP_PRESENT; | |
221 | if (pdata->charge_gpio >= 0) | |
222 | prop[i++] = POWER_SUPPLY_PROP_STATUS; | |
223 | if (pdata->batt_tech >= 0) | |
224 | prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY; | |
225 | if (pdata->temp_aux >= 0) | |
226 | prop[i++] = POWER_SUPPLY_PROP_TEMP; | |
227 | if (pdata->batt_aux >= 0) | |
228 | prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW; | |
229 | if (pdata->max_voltage >= 0) | |
230 | prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX; | |
231 | if (pdata->min_voltage >= 0) | |
232 | prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN; | |
233 | ||
234 | INIT_WORK(&bat_work, wm97xx_bat_work); | |
235 | ||
236 | if (!pdata->batt_name) { | |
237 | dev_info(&dev->dev, "Please consider setting proper battery " | |
238 | "name in platform definition file, falling " | |
239 | "back to name \"wm97xx-batt\"\n"); | |
240 | bat_ps.name = "wm97xx-batt"; | |
241 | } else | |
242 | bat_ps.name = pdata->batt_name; | |
243 | ||
244 | bat_ps.properties = prop; | |
245 | bat_ps.num_properties = props; | |
246 | ||
247 | ret = power_supply_register(&dev->dev, &bat_ps); | |
248 | if (!ret) | |
249 | schedule_work(&bat_work); | |
250 | else | |
7c87942a | 251 | goto err4; |
4e9687d9 MV |
252 | |
253 | return 0; | |
7c87942a | 254 | err4: |
4e9687d9 | 255 | kfree(prop); |
7c87942a MV |
256 | err3: |
257 | if (gpio_is_valid(pdata->charge_gpio)) | |
258 | free_irq(gpio_to_irq(pdata->charge_gpio), dev); | |
4e9687d9 | 259 | err2: |
7c87942a MV |
260 | if (gpio_is_valid(pdata->charge_gpio)) |
261 | gpio_free(pdata->charge_gpio); | |
4e9687d9 MV |
262 | err: |
263 | return ret; | |
264 | } | |
265 | ||
415ec69f | 266 | static int wm97xx_bat_remove(struct platform_device *dev) |
4e9687d9 | 267 | { |
b8bdc1d0 MV |
268 | struct wm97xx_pdata *wmdata = dev->dev.platform_data; |
269 | struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata; | |
270 | ||
7c87942a MV |
271 | if (pdata && gpio_is_valid(pdata->charge_gpio)) { |
272 | free_irq(gpio_to_irq(pdata->charge_gpio), dev); | |
4e9687d9 | 273 | gpio_free(pdata->charge_gpio); |
7c87942a | 274 | } |
bc51e7ff | 275 | cancel_work_sync(&bat_work); |
4e9687d9 MV |
276 | power_supply_unregister(&bat_ps); |
277 | kfree(prop); | |
278 | return 0; | |
279 | } | |
280 | ||
281 | static struct platform_driver wm97xx_bat_driver = { | |
282 | .driver = { | |
283 | .name = "wm97xx-battery", | |
284 | .owner = THIS_MODULE, | |
83a8af0d MV |
285 | #ifdef CONFIG_PM |
286 | .pm = &wm97xx_bat_pm_ops, | |
287 | #endif | |
4e9687d9 MV |
288 | }, |
289 | .probe = wm97xx_bat_probe, | |
28ea73f4 | 290 | .remove = wm97xx_bat_remove, |
4e9687d9 MV |
291 | }; |
292 | ||
300bac7f | 293 | module_platform_driver(wm97xx_bat_driver); |
4e9687d9 MV |
294 | |
295 | MODULE_LICENSE("GPL"); | |
296 | MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>"); | |
297 | MODULE_DESCRIPTION("WM97xx battery driver"); |