69f8aa3a6a4bda06b34ed6e7d147b09d723eaedc
[linux-2.6.git] / drivers / power / pda_power.c
1 /*
2  * Common power driver for PDAs and phones with one or two external
3  * power supplies (AC/USB) connected to main and backup batteries,
4  * and optional builtin charger.
5  *
6  * Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  */
12
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/err.h>
16 #include <linux/interrupt.h>
17 #include <linux/power_supply.h>
18 #include <linux/pda_power.h>
19 #include <linux/regulator/consumer.h>
20 #include <linux/timer.h>
21 #include <linux/jiffies.h>
22 #include <linux/usb/otg.h>
23
24 static inline unsigned int get_irq_flags(struct resource *res)
25 {
26         unsigned int flags = IRQF_SAMPLE_RANDOM | IRQF_SHARED;
27
28         flags |= res->flags & IRQF_TRIGGER_MASK;
29
30         return flags;
31 }
32
33 static struct device *dev;
34 static struct pda_power_pdata *pdata;
35 static struct resource *ac_irq, *usb_irq;
36 static struct timer_list charger_timer;
37 static struct timer_list supply_timer;
38 static struct timer_list polling_timer;
39 static int polling;
40
41 #ifdef CONFIG_USB_OTG_UTILS
42 static struct otg_transceiver *transceiver;
43 #endif
44 static struct regulator *ac_draw;
45
46 enum {
47         PDA_PSY_OFFLINE = 0,
48         PDA_PSY_ONLINE = 1,
49         PDA_PSY_TO_CHANGE,
50 };
51 static int new_ac_status = -1;
52 static int new_usb_status = -1;
53 static int ac_status = -1;
54 static int usb_status = -1;
55
56 static int pda_power_get_property(struct power_supply *psy,
57                                   enum power_supply_property psp,
58                                   union power_supply_propval *val)
59 {
60         switch (psp) {
61         case POWER_SUPPLY_PROP_ONLINE:
62                 if (psy->type == POWER_SUPPLY_TYPE_MAINS)
63                         val->intval = pdata->is_ac_online ?
64                                       pdata->is_ac_online() : 0;
65                 else
66                         val->intval = pdata->is_usb_online ?
67                                       pdata->is_usb_online() : 0;
68                 break;
69         default:
70                 return -EINVAL;
71         }
72         return 0;
73 }
74
75 static enum power_supply_property pda_power_props[] = {
76         POWER_SUPPLY_PROP_ONLINE,
77 };
78
79 static char *pda_power_supplied_to[] = {
80         "main-battery",
81         "backup-battery",
82 };
83
84 static struct power_supply pda_psy_ac = {
85         .name = "ac",
86         .type = POWER_SUPPLY_TYPE_MAINS,
87         .supplied_to = pda_power_supplied_to,
88         .num_supplicants = ARRAY_SIZE(pda_power_supplied_to),
89         .properties = pda_power_props,
90         .num_properties = ARRAY_SIZE(pda_power_props),
91         .get_property = pda_power_get_property,
92 };
93
94 static struct power_supply pda_psy_usb = {
95         .name = "usb",
96         .type = POWER_SUPPLY_TYPE_USB,
97         .supplied_to = pda_power_supplied_to,
98         .num_supplicants = ARRAY_SIZE(pda_power_supplied_to),
99         .properties = pda_power_props,
100         .num_properties = ARRAY_SIZE(pda_power_props),
101         .get_property = pda_power_get_property,
102 };
103
104 static void update_status(void)
105 {
106         if (pdata->is_ac_online)
107                 new_ac_status = !!pdata->is_ac_online();
108
109         if (pdata->is_usb_online)
110                 new_usb_status = !!pdata->is_usb_online();
111 }
112
113 static void update_charger(void)
114 {
115         static int regulator_enabled;
116         int max_uA = pdata->ac_max_uA;
117
118         if (pdata->set_charge) {
119                 if (new_ac_status > 0) {
120                         dev_dbg(dev, "charger on (AC)\n");
121                         pdata->set_charge(PDA_POWER_CHARGE_AC);
122                 } else if (new_usb_status > 0) {
123                         dev_dbg(dev, "charger on (USB)\n");
124                         pdata->set_charge(PDA_POWER_CHARGE_USB);
125                 } else {
126                         dev_dbg(dev, "charger off\n");
127                         pdata->set_charge(0);
128                 }
129         } else if (ac_draw) {
130                 if (new_ac_status > 0) {
131                         regulator_set_current_limit(ac_draw, max_uA, max_uA);
132                         if (!regulator_enabled) {
133                                 dev_dbg(dev, "charger on (AC)\n");
134                                 regulator_enable(ac_draw);
135                                 regulator_enabled = 1;
136                         }
137                 } else {
138                         if (regulator_enabled) {
139                                 dev_dbg(dev, "charger off\n");
140                                 regulator_disable(ac_draw);
141                                 regulator_enabled = 0;
142                         }
143                 }
144         }
145 }
146
147 static void supply_timer_func(unsigned long unused)
148 {
149         if (ac_status == PDA_PSY_TO_CHANGE) {
150                 ac_status = new_ac_status;
151                 power_supply_changed(&pda_psy_ac);
152         }
153
154         if (usb_status == PDA_PSY_TO_CHANGE) {
155                 usb_status = new_usb_status;
156                 power_supply_changed(&pda_psy_usb);
157         }
158 }
159
160 static void psy_changed(void)
161 {
162         update_charger();
163
164         /*
165          * Okay, charger set. Now wait a bit before notifying supplicants,
166          * charge power should stabilize.
167          */
168         mod_timer(&supply_timer,
169                   jiffies + msecs_to_jiffies(pdata->wait_for_charger));
170 }
171
172 static void charger_timer_func(unsigned long unused)
173 {
174         update_status();
175         psy_changed();
176 }
177
178 static irqreturn_t power_changed_isr(int irq, void *power_supply)
179 {
180         if (power_supply == &pda_psy_ac)
181                 ac_status = PDA_PSY_TO_CHANGE;
182         else if (power_supply == &pda_psy_usb)
183                 usb_status = PDA_PSY_TO_CHANGE;
184         else
185                 return IRQ_NONE;
186
187         /*
188          * Wait a bit before reading ac/usb line status and setting charger,
189          * because ac/usb status readings may lag from irq.
190          */
191         mod_timer(&charger_timer,
192                   jiffies + msecs_to_jiffies(pdata->wait_for_status));
193
194         return IRQ_HANDLED;
195 }
196
197 static void polling_timer_func(unsigned long unused)
198 {
199         int changed = 0;
200
201         dev_dbg(dev, "polling...\n");
202
203         update_status();
204
205         if (!ac_irq && new_ac_status != ac_status) {
206                 ac_status = PDA_PSY_TO_CHANGE;
207                 changed = 1;
208         }
209
210         if (!usb_irq && new_usb_status != usb_status) {
211                 usb_status = PDA_PSY_TO_CHANGE;
212                 changed = 1;
213         }
214
215         if (changed)
216                 psy_changed();
217
218         mod_timer(&polling_timer,
219                   jiffies + msecs_to_jiffies(pdata->polling_interval));
220 }
221
222 #ifdef CONFIG_USB_OTG_UTILS
223 static int otg_is_usb_online(void)
224 {
225         return (transceiver->state == OTG_STATE_B_PERIPHERAL);
226 }
227 #endif
228
229 static int pda_power_probe(struct platform_device *pdev)
230 {
231         int ret = 0;
232
233         dev = &pdev->dev;
234
235         if (pdev->id != -1) {
236                 dev_err(dev, "it's meaningless to register several "
237                         "pda_powers; use id = -1\n");
238                 ret = -EINVAL;
239                 goto wrongid;
240         }
241
242         pdata = pdev->dev.platform_data;
243
244         if (pdata->init) {
245                 ret = pdata->init(dev);
246                 if (ret < 0)
247                         goto init_failed;
248         }
249
250         update_status();
251         update_charger();
252
253         if (!pdata->wait_for_status)
254                 pdata->wait_for_status = 500;
255
256         if (!pdata->wait_for_charger)
257                 pdata->wait_for_charger = 500;
258
259         if (!pdata->polling_interval)
260                 pdata->polling_interval = 2000;
261
262         if (!pdata->ac_max_uA)
263                 pdata->ac_max_uA = 500000;
264
265         setup_timer(&charger_timer, charger_timer_func, 0);
266         setup_timer(&supply_timer, supply_timer_func, 0);
267
268         ac_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "ac");
269         usb_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "usb");
270
271         if (pdata->supplied_to) {
272                 pda_psy_ac.supplied_to = pdata->supplied_to;
273                 pda_psy_ac.num_supplicants = pdata->num_supplicants;
274                 pda_psy_usb.supplied_to = pdata->supplied_to;
275                 pda_psy_usb.num_supplicants = pdata->num_supplicants;
276         }
277
278         ac_draw = regulator_get(dev, "ac_draw");
279         if (IS_ERR(ac_draw)) {
280                 dev_dbg(dev, "couldn't get ac_draw regulator\n");
281                 ac_draw = NULL;
282                 ret = PTR_ERR(ac_draw);
283         }
284
285         if (pdata->is_ac_online) {
286                 ret = power_supply_register(&pdev->dev, &pda_psy_ac);
287                 if (ret) {
288                         dev_err(dev, "failed to register %s power supply\n",
289                                 pda_psy_ac.name);
290                         goto ac_supply_failed;
291                 }
292
293                 if (ac_irq) {
294                         ret = request_irq(ac_irq->start, power_changed_isr,
295                                           get_irq_flags(ac_irq), ac_irq->name,
296                                           &pda_psy_ac);
297                         if (ret) {
298                                 dev_err(dev, "request ac irq failed\n");
299                                 goto ac_irq_failed;
300                         }
301                 } else {
302                         polling = 1;
303                 }
304         }
305
306 #ifdef CONFIG_USB_OTG_UTILS
307         transceiver = otg_get_transceiver();
308         if (transceiver && !pdata->is_usb_online) {
309                 pdata->is_usb_online = otg_is_usb_online;
310         }
311 #endif
312
313         if (pdata->is_usb_online) {
314                 ret = power_supply_register(&pdev->dev, &pda_psy_usb);
315                 if (ret) {
316                         dev_err(dev, "failed to register %s power supply\n",
317                                 pda_psy_usb.name);
318                         goto usb_supply_failed;
319                 }
320
321                 if (usb_irq) {
322                         ret = request_irq(usb_irq->start, power_changed_isr,
323                                           get_irq_flags(usb_irq),
324                                           usb_irq->name, &pda_psy_usb);
325                         if (ret) {
326                                 dev_err(dev, "request usb irq failed\n");
327                                 goto usb_irq_failed;
328                         }
329                 } else {
330                         polling = 1;
331                 }
332         }
333
334         if (polling) {
335                 dev_dbg(dev, "will poll for status\n");
336                 setup_timer(&polling_timer, polling_timer_func, 0);
337                 mod_timer(&polling_timer,
338                           jiffies + msecs_to_jiffies(pdata->polling_interval));
339         }
340
341         if (ac_irq || usb_irq)
342                 device_init_wakeup(&pdev->dev, 1);
343
344         return 0;
345
346 usb_irq_failed:
347         if (pdata->is_usb_online)
348                 power_supply_unregister(&pda_psy_usb);
349 usb_supply_failed:
350         if (pdata->is_ac_online && ac_irq)
351                 free_irq(ac_irq->start, &pda_psy_ac);
352 #ifdef CONFIG_USB_OTG_UTILS
353         if (transceiver)
354                 otg_put_transceiver(transceiver);
355 #endif
356 ac_irq_failed:
357         if (pdata->is_ac_online)
358                 power_supply_unregister(&pda_psy_ac);
359 ac_supply_failed:
360         if (ac_draw) {
361                 regulator_put(ac_draw);
362                 ac_draw = NULL;
363         }
364         if (pdata->exit)
365                 pdata->exit(dev);
366 init_failed:
367 wrongid:
368         return ret;
369 }
370
371 static int pda_power_remove(struct platform_device *pdev)
372 {
373         if (pdata->is_usb_online && usb_irq)
374                 free_irq(usb_irq->start, &pda_psy_usb);
375         if (pdata->is_ac_online && ac_irq)
376                 free_irq(ac_irq->start, &pda_psy_ac);
377
378         if (polling)
379                 del_timer_sync(&polling_timer);
380         del_timer_sync(&charger_timer);
381         del_timer_sync(&supply_timer);
382
383         if (pdata->is_usb_online)
384                 power_supply_unregister(&pda_psy_usb);
385         if (pdata->is_ac_online)
386                 power_supply_unregister(&pda_psy_ac);
387 #ifdef CONFIG_USB_OTG_UTILS
388         if (transceiver)
389                 otg_put_transceiver(transceiver);
390 #endif
391         if (ac_draw) {
392                 regulator_put(ac_draw);
393                 ac_draw = NULL;
394         }
395         if (pdata->exit)
396                 pdata->exit(dev);
397
398         return 0;
399 }
400
401 #ifdef CONFIG_PM
402 static int ac_wakeup_enabled;
403 static int usb_wakeup_enabled;
404
405 static int pda_power_suspend(struct platform_device *pdev, pm_message_t state)
406 {
407         if (pdata->suspend) {
408                 int ret = pdata->suspend(state);
409
410                 if (ret)
411                         return ret;
412         }
413
414         if (device_may_wakeup(&pdev->dev)) {
415                 if (ac_irq)
416                         ac_wakeup_enabled = !enable_irq_wake(ac_irq->start);
417                 if (usb_irq)
418                         usb_wakeup_enabled = !enable_irq_wake(usb_irq->start);
419         }
420
421         return 0;
422 }
423
424 static int pda_power_resume(struct platform_device *pdev)
425 {
426         if (device_may_wakeup(&pdev->dev)) {
427                 if (usb_irq && usb_wakeup_enabled)
428                         disable_irq_wake(usb_irq->start);
429                 if (ac_irq && ac_wakeup_enabled)
430                         disable_irq_wake(ac_irq->start);
431         }
432
433         if (pdata->resume)
434                 return pdata->resume();
435
436         return 0;
437 }
438 #else
439 #define pda_power_suspend NULL
440 #define pda_power_resume NULL
441 #endif /* CONFIG_PM */
442
443 MODULE_ALIAS("platform:pda-power");
444
445 static struct platform_driver pda_power_pdrv = {
446         .driver = {
447                 .name = "pda-power",
448         },
449         .probe = pda_power_probe,
450         .remove = pda_power_remove,
451         .suspend = pda_power_suspend,
452         .resume = pda_power_resume,
453 };
454
455 static int __init pda_power_init(void)
456 {
457         return platform_driver_register(&pda_power_pdrv);
458 }
459
460 static void __exit pda_power_exit(void)
461 {
462         platform_driver_unregister(&pda_power_pdrv);
463 }
464
465 module_init(pda_power_init);
466 module_exit(pda_power_exit);
467 MODULE_LICENSE("GPL");
468 MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>");