POWER: Add JZ4740 battery driver.
[linux-2.6.git] / drivers / power / jz4740-battery.c
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
23 #include <linux/delay.h>
24 #include <linux/gpio.h>
25 #include <linux/mfd/core.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         struct platform_device *pdev;
34
35         struct resource *mem;
36         void __iomem *base;
37
38         int irq;
39         int charge_irq;
40
41         struct mfd_cell *cell;
42
43         int status;
44         long voltage;
45
46         struct completion read_completion;
47
48         struct power_supply battery;
49         struct delayed_work work;
50 };
51
52 static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy)
53 {
54         return container_of(psy, struct jz_battery, battery);
55 }
56
57 static irqreturn_t jz_battery_irq_handler(int irq, void *devid)
58 {
59         struct jz_battery *battery = devid;
60
61         complete(&battery->read_completion);
62         return IRQ_HANDLED;
63 }
64
65 static long jz_battery_read_voltage(struct jz_battery *battery)
66 {
67         unsigned long t;
68         unsigned long val;
69         long voltage;
70
71         INIT_COMPLETION(battery->read_completion);
72
73         enable_irq(battery->irq);
74         battery->cell->enable(battery->pdev);
75
76         t = wait_for_completion_interruptible_timeout(&battery->read_completion,
77                 HZ);
78
79         if (t > 0) {
80                 val = readw(battery->base) & 0xfff;
81
82                 if (battery->pdata->info.voltage_max_design <= 2500000)
83                         val = (val * 78125UL) >> 7UL;
84                 else
85                         val = ((val * 924375UL) >> 9UL) + 33000;
86                 voltage = (long)val;
87         } else {
88                 voltage = t ? t : -ETIMEDOUT;
89         }
90
91         battery->cell->disable(battery->pdev);
92         disable_irq(battery->irq);
93
94         return voltage;
95 }
96
97 static int jz_battery_get_capacity(struct power_supply *psy)
98 {
99         struct jz_battery *jz_battery = psy_to_jz_battery(psy);
100         struct power_supply_info *info = &jz_battery->pdata->info;
101         long voltage;
102         int ret;
103         int voltage_span;
104
105         voltage = jz_battery_read_voltage(jz_battery);
106
107         if (voltage < 0)
108                 return voltage;
109
110         voltage_span = info->voltage_max_design - info->voltage_min_design;
111         ret = ((voltage - info->voltage_min_design) * 100) / voltage_span;
112
113         if (ret > 100)
114                 ret = 100;
115         else if (ret < 0)
116                 ret = 0;
117
118         return ret;
119 }
120
121 static int jz_battery_get_property(struct power_supply *psy,
122         enum power_supply_property psp, union power_supply_propval *val)
123 {
124         struct jz_battery *jz_battery = psy_to_jz_battery(psy);
125         struct power_supply_info *info = &jz_battery->pdata->info;
126         long voltage;
127
128         switch (psp) {
129         case POWER_SUPPLY_PROP_STATUS:
130                 val->intval = jz_battery->status;
131                 break;
132         case POWER_SUPPLY_PROP_TECHNOLOGY:
133                 val->intval = jz_battery->pdata->info.technology;
134                 break;
135         case POWER_SUPPLY_PROP_HEALTH:
136                 voltage = jz_battery_read_voltage(jz_battery);
137                 if (voltage < info->voltage_min_design)
138                         val->intval = POWER_SUPPLY_HEALTH_DEAD;
139                 else
140                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
141                 break;
142         case POWER_SUPPLY_PROP_CAPACITY:
143                 val->intval = jz_battery_get_capacity(psy);
144                 break;
145         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
146                 val->intval = jz_battery_read_voltage(jz_battery);
147                 if (val->intval < 0)
148                         return val->intval;
149                 break;
150         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
151                 val->intval = info->voltage_max_design;
152                 break;
153         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
154                 val->intval = info->voltage_min_design;
155                 break;
156         case POWER_SUPPLY_PROP_PRESENT:
157                 val->intval = 1;
158                 break;
159         default:
160                 return -EINVAL;
161         }
162         return 0;
163 }
164
165 static void jz_battery_external_power_changed(struct power_supply *psy)
166 {
167         struct jz_battery *jz_battery = psy_to_jz_battery(psy);
168
169         cancel_delayed_work(&jz_battery->work);
170         schedule_delayed_work(&jz_battery->work, 0);
171 }
172
173 static irqreturn_t jz_battery_charge_irq(int irq, void *data)
174 {
175         struct jz_battery *jz_battery = data;
176
177         cancel_delayed_work(&jz_battery->work);
178         schedule_delayed_work(&jz_battery->work, 0);
179
180         return IRQ_HANDLED;
181 }
182
183 static void jz_battery_update(struct jz_battery *jz_battery)
184 {
185         int status;
186         long voltage;
187         bool has_changed = false;
188         int is_charging;
189
190         if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
191                 is_charging = gpio_get_value(jz_battery->pdata->gpio_charge);
192                 is_charging ^= jz_battery->pdata->gpio_charge_active_low;
193                 if (is_charging)
194                         status = POWER_SUPPLY_STATUS_CHARGING;
195                 else
196                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
197
198                 if (status != jz_battery->status) {
199                         jz_battery->status = status;
200                         has_changed = true;
201                 }
202         }
203
204         voltage = jz_battery_read_voltage(jz_battery);
205         if (abs(voltage - jz_battery->voltage) < 50000) {
206                 jz_battery->voltage = voltage;
207                 has_changed = true;
208         }
209
210         if (has_changed)
211                 power_supply_changed(&jz_battery->battery);
212 }
213
214 static enum power_supply_property jz_battery_properties[] = {
215         POWER_SUPPLY_PROP_STATUS,
216         POWER_SUPPLY_PROP_TECHNOLOGY,
217         POWER_SUPPLY_PROP_HEALTH,
218         POWER_SUPPLY_PROP_CAPACITY,
219         POWER_SUPPLY_PROP_VOLTAGE_NOW,
220         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
221         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
222         POWER_SUPPLY_PROP_PRESENT,
223 };
224
225 static void jz_battery_work(struct work_struct *work)
226 {
227         /* Too small interval will increase system workload */
228         const int interval = HZ * 30;
229         struct jz_battery *jz_battery = container_of(work, struct jz_battery,
230                                             work.work);
231
232         jz_battery_update(jz_battery);
233         schedule_delayed_work(&jz_battery->work, interval);
234 }
235
236 static int __devinit jz_battery_probe(struct platform_device *pdev)
237 {
238         int ret = 0;
239         struct jz_battery_platform_data *pdata = pdev->dev.parent->platform_data;
240         struct jz_battery *jz_battery;
241         struct power_supply *battery;
242
243         jz_battery = kzalloc(sizeof(*jz_battery), GFP_KERNEL);
244         if (!jz_battery) {
245                 dev_err(&pdev->dev, "Failed to allocate driver structure\n");
246                 return -ENOMEM;
247         }
248
249         jz_battery->cell = pdev->dev.platform_data;
250
251         jz_battery->irq = platform_get_irq(pdev, 0);
252         if (jz_battery->irq < 0) {
253                 ret = jz_battery->irq;
254                 dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
255                 goto err_free;
256         }
257
258         jz_battery->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
259         if (!jz_battery->mem) {
260                 ret = -ENOENT;
261                 dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
262                 goto err_free;
263         }
264
265         jz_battery->mem = request_mem_region(jz_battery->mem->start,
266                                 resource_size(jz_battery->mem), pdev->name);
267         if (!jz_battery->mem) {
268                 ret = -EBUSY;
269                 dev_err(&pdev->dev, "Failed to request mmio memory region\n");
270                 goto err_free;
271         }
272
273         jz_battery->base = ioremap_nocache(jz_battery->mem->start,
274                                 resource_size(jz_battery->mem));
275         if (!jz_battery->base) {
276                 ret = -EBUSY;
277                 dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
278                 goto err_release_mem_region;
279         }
280
281         battery = &jz_battery->battery;
282         battery->name = pdata->info.name;
283         battery->type = POWER_SUPPLY_TYPE_BATTERY;
284         battery->properties     = jz_battery_properties;
285         battery->num_properties = ARRAY_SIZE(jz_battery_properties);
286         battery->get_property = jz_battery_get_property;
287         battery->external_power_changed = jz_battery_external_power_changed;
288         battery->use_for_apm = 1;
289
290         jz_battery->pdata = pdata;
291         jz_battery->pdev = pdev;
292
293         init_completion(&jz_battery->read_completion);
294
295         INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);
296
297         ret = request_irq(jz_battery->irq, jz_battery_irq_handler, 0, pdev->name,
298                         jz_battery);
299         if (ret) {
300                 dev_err(&pdev->dev, "Failed to request irq %d\n", ret);
301                 goto err_iounmap;
302         }
303         disable_irq(jz_battery->irq);
304
305         if (gpio_is_valid(pdata->gpio_charge)) {
306                 ret = gpio_request(pdata->gpio_charge, dev_name(&pdev->dev));
307                 if (ret) {
308                         dev_err(&pdev->dev, "charger state gpio request failed.\n");
309                         goto err_free_irq;
310                 }
311                 ret = gpio_direction_input(pdata->gpio_charge);
312                 if (ret) {
313                         dev_err(&pdev->dev, "charger state gpio set direction failed.\n");
314                         goto err_free_gpio;
315                 }
316
317                 jz_battery->charge_irq = gpio_to_irq(pdata->gpio_charge);
318
319                 if (jz_battery->charge_irq >= 0) {
320                         ret = request_irq(jz_battery->charge_irq,
321                                     jz_battery_charge_irq,
322                                     IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
323                                     dev_name(&pdev->dev), jz_battery);
324                         if (ret) {
325                                 dev_err(&pdev->dev, "Failed to request charge irq: %d\n", ret);
326                                 goto err_free_gpio;
327                         }
328                 }
329         } else {
330                 jz_battery->charge_irq = -1;
331         }
332
333         if (jz_battery->pdata->info.voltage_max_design <= 2500000)
334                 jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB,
335                         JZ_ADC_CONFIG_BAT_MB);
336         else
337                 jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB, 0);
338
339         ret = power_supply_register(&pdev->dev, &jz_battery->battery);
340         if (ret) {
341                 dev_err(&pdev->dev, "power supply battery register failed.\n");
342                 goto err_free_charge_irq;
343         }
344
345         platform_set_drvdata(pdev, jz_battery);
346         schedule_delayed_work(&jz_battery->work, 0);
347
348         return 0;
349
350 err_free_charge_irq:
351         if (jz_battery->charge_irq >= 0)
352                 free_irq(jz_battery->charge_irq, jz_battery);
353 err_free_gpio:
354         if (gpio_is_valid(pdata->gpio_charge))
355                 gpio_free(jz_battery->pdata->gpio_charge);
356 err_free_irq:
357         free_irq(jz_battery->irq, jz_battery);
358 err_iounmap:
359         platform_set_drvdata(pdev, NULL);
360         iounmap(jz_battery->base);
361 err_release_mem_region:
362         release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));
363 err_free:
364         kfree(jz_battery);
365         return ret;
366 }
367
368 static int __devexit jz_battery_remove(struct platform_device *pdev)
369 {
370         struct jz_battery *jz_battery = platform_get_drvdata(pdev);
371
372         cancel_delayed_work_sync(&jz_battery->work);
373
374         if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
375                 if (jz_battery->charge_irq >= 0)
376                         free_irq(jz_battery->charge_irq, jz_battery);
377                 gpio_free(jz_battery->pdata->gpio_charge);
378         }
379
380         power_supply_unregister(&jz_battery->battery);
381
382         free_irq(jz_battery->irq, jz_battery);
383
384         iounmap(jz_battery->base);
385         release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));
386
387         return 0;
388 }
389
390 #ifdef CONFIG_PM
391 static int jz_battery_suspend(struct device *dev)
392 {
393         struct jz_battery *jz_battery = dev_get_drvdata(dev);
394
395         cancel_delayed_work_sync(&jz_battery->work);
396         jz_battery->status = POWER_SUPPLY_STATUS_UNKNOWN;
397
398         return 0;
399 }
400
401 static int jz_battery_resume(struct device *dev)
402 {
403         struct jz_battery *jz_battery = dev_get_drvdata(dev);
404
405         schedule_delayed_work(&jz_battery->work, 0);
406
407         return 0;
408 }
409
410 static const struct dev_pm_ops jz_battery_pm_ops = {
411         .suspend        = jz_battery_suspend,
412         .resume         = jz_battery_resume,
413 };
414
415 #define JZ_BATTERY_PM_OPS (&jz_battery_pm_ops)
416 #else
417 #define JZ_BATTERY_PM_OPS NULL
418 #endif
419
420 static struct platform_driver jz_battery_driver = {
421         .probe          = jz_battery_probe,
422         .remove         = __devexit_p(jz_battery_remove),
423         .driver = {
424                 .name = "jz4740-battery",
425                 .owner = THIS_MODULE,
426                 .pm = JZ_BATTERY_PM_OPS,
427         },
428 };
429
430 static int __init jz_battery_init(void)
431 {
432         return platform_driver_register(&jz_battery_driver);
433 }
434 module_init(jz_battery_init);
435
436 static void __exit jz_battery_exit(void)
437 {
438         platform_driver_unregister(&jz_battery_driver);
439 }
440 module_exit(jz_battery_exit);
441
442 MODULE_ALIAS("platform:jz4740-battery");
443 MODULE_LICENSE("GPL");
444 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
445 MODULE_DESCRIPTION("JZ4740 SoC battery driver");