Root/
Source at commit 78fb3151e1fc0233ea16788043899dec4079311e created 13 years 10 months ago. By Lars-Peter Clausen, jz4740-battery: Add MODULE_ALIAS entry | |
---|---|
1 | /* |
2 | * Battery measurement code for Ingenic JZ SOC. |
3 | * |
4 | * Copyright (C) 2009 Jiejing Zhang <kzjeef@gmail.com> |
5 | * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de> |
6 | * |
7 | * based on tosa_battery.c |
8 | * |
9 | * Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com> |
10 | * |
11 | * This program is free software; you can redistribute it and/or modify |
12 | * it under the terms of the GNU General Public License version 2 as |
13 | * published by the Free Software Foundation. |
14 | * |
15 | */ |
16 | |
17 | #include <linux/interrupt.h> |
18 | #include <linux/kernel.h> |
19 | #include <linux/module.h> |
20 | #include <linux/platform_device.h> |
21 | #include <linux/slab.h> |
22 | #include <linux/spinlock.h> |
23 | |
24 | #include <linux/delay.h> |
25 | #include <linux/gpio.h> |
26 | #include <linux/power_supply.h> |
27 | |
28 | #include <linux/power/jz4740-battery.h> |
29 | #include <linux/jz4740-adc.h> |
30 | |
31 | struct jz_battery { |
32 | struct jz_battery_platform_data *pdata; |
33 | |
34 | int charge_irq; |
35 | |
36 | int status; |
37 | long voltage; |
38 | |
39 | struct power_supply battery; |
40 | struct delayed_work work; |
41 | }; |
42 | |
43 | static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy) |
44 | { |
45 | return container_of(psy, struct jz_battery, battery); |
46 | } |
47 | |
48 | static long jz_battery_read_voltage(struct jz_battery *jz_battery) |
49 | { |
50 | struct device *adc = jz_battery->battery.dev->parent->parent; |
51 | enum jz_adc_battery_scale scale; |
52 | |
53 | if (jz_battery->pdata->info.voltage_max_design > 2500000) |
54 | scale = JZ_ADC_BATTERY_SCALE_7V5; |
55 | else |
56 | scale = JZ_ADC_BATTERY_SCALE_2V5; |
57 | |
58 | return jz4740_adc_read_battery_voltage(adc, scale); |
59 | } |
60 | |
61 | static int jz_battery_get_capacity(struct power_supply *psy) |
62 | { |
63 | struct jz_battery *jz_battery = psy_to_jz_battery(psy); |
64 | struct power_supply_info *info = &jz_battery->pdata->info; |
65 | long voltage; |
66 | int ret; |
67 | int voltage_span; |
68 | |
69 | voltage = jz_battery_read_voltage(jz_battery); |
70 | |
71 | if (voltage < 0) |
72 | return voltage; |
73 | |
74 | voltage_span = info->voltage_max_design - info->voltage_min_design; |
75 | ret = ((voltage - info->voltage_min_design) * 100) / voltage_span; |
76 | |
77 | if (ret > 100) |
78 | ret = 100; |
79 | else if (ret < 0) |
80 | ret = 0; |
81 | |
82 | return ret; |
83 | } |
84 | |
85 | static int jz_battery_get_property(struct power_supply *psy, |
86 | enum power_supply_property psp, |
87 | union power_supply_propval *val) |
88 | { |
89 | struct jz_battery *jz_battery = psy_to_jz_battery(psy); |
90 | struct power_supply_info *info = &jz_battery->pdata->info; |
91 | long voltage; |
92 | |
93 | switch (psp) { |
94 | case POWER_SUPPLY_PROP_STATUS: |
95 | val->intval = jz_battery->status; |
96 | break; |
97 | case POWER_SUPPLY_PROP_TECHNOLOGY: |
98 | val->intval = jz_battery->pdata->info.technology; |
99 | break; |
100 | case POWER_SUPPLY_PROP_HEALTH: |
101 | voltage = jz_battery_read_voltage(jz_battery); |
102 | if (voltage < info->voltage_min_design) |
103 | val->intval = POWER_SUPPLY_HEALTH_DEAD; |
104 | else |
105 | val->intval = POWER_SUPPLY_HEALTH_GOOD; |
106 | break; |
107 | case POWER_SUPPLY_PROP_CAPACITY: |
108 | val->intval = jz_battery_get_capacity(psy); |
109 | break; |
110 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
111 | val->intval = jz_battery_read_voltage(jz_battery); |
112 | if (val->intval < 0) |
113 | return val->intval; |
114 | break; |
115 | case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: |
116 | val->intval = info->voltage_max_design; |
117 | break; |
118 | case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: |
119 | val->intval = info->voltage_min_design; |
120 | break; |
121 | case POWER_SUPPLY_PROP_PRESENT: |
122 | val->intval = 1; |
123 | break; |
124 | default: |
125 | return -EINVAL; |
126 | } |
127 | return 0; |
128 | } |
129 | |
130 | static void jz_battery_external_power_changed(struct power_supply *psy) |
131 | { |
132 | struct jz_battery *jz_battery = psy_to_jz_battery(psy); |
133 | |
134 | cancel_delayed_work(&jz_battery->work); |
135 | schedule_delayed_work(&jz_battery->work, 0); |
136 | } |
137 | |
138 | static irqreturn_t jz_battery_charge_irq(int irq, void *data) |
139 | { |
140 | struct jz_battery *jz_battery = data; |
141 | |
142 | cancel_delayed_work(&jz_battery->work); |
143 | schedule_delayed_work(&jz_battery->work, 0); |
144 | |
145 | return IRQ_HANDLED; |
146 | } |
147 | |
148 | static void jz_battery_update(struct jz_battery *jz_battery) |
149 | { |
150 | int status; |
151 | long voltage; |
152 | long voltage_difference; |
153 | bool has_changed = 0; |
154 | |
155 | if (gpio_is_valid(jz_battery->pdata->gpio_charge)) { |
156 | int is_charging; |
157 | |
158 | is_charging = gpio_get_value(jz_battery->pdata->gpio_charge); |
159 | is_charging ^= jz_battery->pdata->gpio_charge_active_low; |
160 | if (is_charging) |
161 | status = POWER_SUPPLY_STATUS_CHARGING; |
162 | else |
163 | status = POWER_SUPPLY_STATUS_NOT_CHARGING; |
164 | |
165 | if (status != jz_battery->status) { |
166 | jz_battery->status = status; |
167 | has_changed = 1; |
168 | } |
169 | } |
170 | |
171 | voltage = jz_battery_read_voltage(jz_battery); |
172 | voltage_difference = voltage - jz_battery->voltage; |
173 | if (voltage_difference > 50000 || voltage_difference < 50000) { |
174 | jz_battery->voltage = voltage; |
175 | has_changed = 1; |
176 | } |
177 | if (has_changed) |
178 | power_supply_changed(&jz_battery->battery); |
179 | } |
180 | |
181 | static enum power_supply_property jz_battery_properties[] = { |
182 | POWER_SUPPLY_PROP_STATUS, |
183 | POWER_SUPPLY_PROP_TECHNOLOGY, |
184 | POWER_SUPPLY_PROP_HEALTH, |
185 | POWER_SUPPLY_PROP_CAPACITY, |
186 | POWER_SUPPLY_PROP_VOLTAGE_NOW, |
187 | POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, |
188 | POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, |
189 | POWER_SUPPLY_PROP_PRESENT, |
190 | }; |
191 | |
192 | static void jz_battery_work(struct work_struct *work) |
193 | { |
194 | /* Too small interval will increase system workload */ |
195 | const int interval = HZ * 30; |
196 | struct jz_battery *jz_battery = container_of(work, struct jz_battery, |
197 | work.work); |
198 | |
199 | jz_battery_update(jz_battery); |
200 | schedule_delayed_work(&jz_battery->work, interval); |
201 | } |
202 | |
203 | static int __devinit jz_battery_probe(struct platform_device *pdev) |
204 | { |
205 | int ret = 0; |
206 | struct jz_battery_platform_data *pdata = pdev->dev.platform_data; |
207 | struct jz_battery *jz_battery; |
208 | struct power_supply *battery; |
209 | |
210 | if (!pdev->dev.platform_data) { |
211 | dev_err(&pdev->dev, "No platform data\n"); |
212 | return -EINVAL; |
213 | } |
214 | |
215 | jz_battery = kzalloc(sizeof(*jz_battery), GFP_KERNEL); |
216 | |
217 | if (!jz_battery) { |
218 | dev_err(&pdev->dev, "Failed to allocate driver structure\n"); |
219 | return -ENOMEM; |
220 | } |
221 | |
222 | battery = &jz_battery->battery; |
223 | battery->name = pdata->info.name; |
224 | battery->type = POWER_SUPPLY_TYPE_BATTERY; |
225 | battery->properties = jz_battery_properties; |
226 | battery->num_properties = ARRAY_SIZE(jz_battery_properties); |
227 | battery->get_property = jz_battery_get_property; |
228 | battery->external_power_changed = jz_battery_external_power_changed; |
229 | battery->use_for_apm = 1; |
230 | |
231 | jz_battery->pdata = pdata; |
232 | |
233 | INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work); |
234 | |
235 | if (gpio_is_valid(pdata->gpio_charge)) { |
236 | ret = gpio_request(pdata->gpio_charge, dev_name(&pdev->dev)); |
237 | if (ret) { |
238 | dev_err(&pdev->dev, "charger state gpio request failed.\n"); |
239 | goto err_free; |
240 | } |
241 | ret = gpio_direction_input(pdata->gpio_charge); |
242 | if (ret) { |
243 | dev_err(&pdev->dev, "charger state gpio set direction failed.\n"); |
244 | goto err_free_gpio; |
245 | } |
246 | |
247 | jz_battery->charge_irq = gpio_to_irq(pdata->gpio_charge); |
248 | |
249 | if (jz_battery->charge_irq >= 0) { |
250 | ret = request_irq(jz_battery->charge_irq, |
251 | jz_battery_charge_irq, |
252 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, |
253 | dev_name(&pdev->dev), jz_battery); |
254 | if (ret) { |
255 | dev_err(&pdev->dev, "Failed to request charge irq: %d\n", ret); |
256 | goto err_free_gpio; |
257 | } |
258 | } |
259 | } else { |
260 | jz_battery->charge_irq = -1; |
261 | } |
262 | |
263 | |
264 | ret = power_supply_register(&pdev->dev, &jz_battery->battery); |
265 | if (ret) { |
266 | dev_err(&pdev->dev, "power supply battery register failed.\n"); |
267 | goto err_free_irq; |
268 | } |
269 | |
270 | platform_set_drvdata(pdev, jz_battery); |
271 | schedule_delayed_work(&jz_battery->work, 0); |
272 | |
273 | return 0; |
274 | |
275 | err_free_irq: |
276 | if (jz_battery->charge_irq >= 0) |
277 | free_irq(jz_battery->charge_irq, jz_battery); |
278 | err_free_gpio: |
279 | if (gpio_is_valid(pdata->gpio_charge)) |
280 | gpio_free(jz_battery->pdata->gpio_charge); |
281 | err_free: |
282 | kfree(jz_battery); |
283 | return ret; |
284 | } |
285 | |
286 | static int __devexit jz_battery_remove(struct platform_device *pdev) |
287 | { |
288 | struct jz_battery *jz_battery = platform_get_drvdata(pdev); |
289 | |
290 | cancel_delayed_work_sync(&jz_battery->work); |
291 | |
292 | if (gpio_is_valid(jz_battery->pdata->gpio_charge)) { |
293 | if (jz_battery->charge_irq >= 0) |
294 | free_irq(jz_battery->charge_irq, jz_battery); |
295 | gpio_free(jz_battery->pdata->gpio_charge); |
296 | } |
297 | |
298 | power_supply_unregister(&jz_battery->battery); |
299 | |
300 | return 0; |
301 | } |
302 | |
303 | #ifdef CONFIG_PM |
304 | static int jz_battery_suspend(struct device *dev) |
305 | { |
306 | struct jz_battery *jz_battery = dev_get_drvdata(dev); |
307 | |
308 | cancel_delayed_work_sync(&jz_battery->work); |
309 | jz_battery->status = POWER_SUPPLY_STATUS_UNKNOWN; |
310 | |
311 | return 0; |
312 | } |
313 | |
314 | static int jz_battery_resume(struct device *dev) |
315 | { |
316 | struct jz_battery *jz_battery = dev_get_drvdata(dev); |
317 | |
318 | schedule_delayed_work(&jz_battery->work, 0); |
319 | |
320 | return 0; |
321 | } |
322 | |
323 | static const struct dev_pm_ops jz_battery_pm_ops = { |
324 | .suspend = jz_battery_suspend, |
325 | .resume = jz_battery_resume, |
326 | }; |
327 | |
328 | #define JZ_BATTERY_PM_OPS (&jz_battery_pm_ops) |
329 | |
330 | #else |
331 | #define JZ_BATTERY_PM_OPS NULL |
332 | #endif |
333 | |
334 | static struct platform_driver jz_battery_driver = { |
335 | .probe = jz_battery_probe, |
336 | .remove = __devexit_p(jz_battery_remove), |
337 | .driver = { |
338 | .name = "jz4740-battery", |
339 | .owner = THIS_MODULE, |
340 | .pm = JZ_BATTERY_PM_OPS, |
341 | }, |
342 | }; |
343 | |
344 | static int __init jz_battery_init(void) |
345 | { |
346 | return platform_driver_register(&jz_battery_driver); |
347 | } |
348 | module_init(jz_battery_init); |
349 | |
350 | static void __exit jz_battery_exit(void) |
351 | { |
352 | platform_driver_unregister(&jz_battery_driver); |
353 | } |
354 | module_exit(jz_battery_exit); |
355 | |
356 | MODULE_ALIAS("platform:jz4740-battery"); |
357 | MODULE_LICENSE("GPL"); |
358 | MODULE_AUTHOR("Jiejing Zhang <kzjeef@gmail.com>"); |
359 | MODULE_DESCRIPTION("JZ4720/JZ4740 SoC battery driver"); |
360 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9