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/notifier.h>
18 #include <linux/power_supply.h>
19 #include <linux/pda_power.h>
20 #include <linux/regulator/consumer.h>
21 #include <linux/timer.h>
22 #include <linux/jiffies.h>
23 #include <linux/usb/otg.h>
24
get_irq_flags(struct resource * res)25 static inline unsigned int get_irq_flags(struct resource *res)
26 {
27 unsigned int flags = IRQF_SAMPLE_RANDOM | IRQF_SHARED;
28
29 flags |= res->flags & IRQF_TRIGGER_MASK;
30
31 return flags;
32 }
33
34 static struct device *dev;
35 static struct pda_power_pdata *pdata;
36 static struct resource *ac_irq, *usb_irq;
37 static struct timer_list charger_timer;
38 static struct timer_list supply_timer;
39 static struct timer_list polling_timer;
40 static int polling;
41
42 #ifdef CONFIG_USB_OTG_UTILS
43 static struct otg_transceiver *transceiver;
44 static struct notifier_block otg_nb;
45 #endif
46
47 static struct regulator *ac_draw;
48
49 enum {
50 PDA_PSY_OFFLINE = 0,
51 PDA_PSY_ONLINE = 1,
52 PDA_PSY_TO_CHANGE,
53 };
54 static int new_ac_status = -1;
55 static int new_usb_status = -1;
56 static int ac_status = -1;
57 static int usb_status = -1;
58
pda_power_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)59 static int pda_power_get_property(struct power_supply *psy,
60 enum power_supply_property psp,
61 union power_supply_propval *val)
62 {
63 switch (psp) {
64 case POWER_SUPPLY_PROP_ONLINE:
65 if (psy->type == POWER_SUPPLY_TYPE_MAINS)
66 val->intval = pdata->is_ac_online ?
67 pdata->is_ac_online() : 0;
68 else
69 val->intval = pdata->is_usb_online ?
70 pdata->is_usb_online() : 0;
71 break;
72 default:
73 return -EINVAL;
74 }
75 return 0;
76 }
77
78 static enum power_supply_property pda_power_props[] = {
79 POWER_SUPPLY_PROP_ONLINE,
80 };
81
82 static char *pda_power_supplied_to[] = {
83 "main-battery",
84 "backup-battery",
85 };
86
87 static struct power_supply pda_psy_ac = {
88 .name = "ac",
89 .type = POWER_SUPPLY_TYPE_MAINS,
90 .supplied_to = pda_power_supplied_to,
91 .num_supplicants = ARRAY_SIZE(pda_power_supplied_to),
92 .properties = pda_power_props,
93 .num_properties = ARRAY_SIZE(pda_power_props),
94 .get_property = pda_power_get_property,
95 };
96
97 static struct power_supply pda_psy_usb = {
98 .name = "usb",
99 .type = POWER_SUPPLY_TYPE_USB,
100 .supplied_to = pda_power_supplied_to,
101 .num_supplicants = ARRAY_SIZE(pda_power_supplied_to),
102 .properties = pda_power_props,
103 .num_properties = ARRAY_SIZE(pda_power_props),
104 .get_property = pda_power_get_property,
105 };
106
update_status(void)107 static void update_status(void)
108 {
109 if (pdata->is_ac_online)
110 new_ac_status = !!pdata->is_ac_online();
111
112 if (pdata->is_usb_online)
113 new_usb_status = !!pdata->is_usb_online();
114 }
115
update_charger(void)116 static void update_charger(void)
117 {
118 static int regulator_enabled;
119 int max_uA = pdata->ac_max_uA;
120
121 if (pdata->set_charge) {
122 if (new_ac_status > 0) {
123 dev_dbg(dev, "charger on (AC)\n");
124 pdata->set_charge(PDA_POWER_CHARGE_AC);
125 } else if (new_usb_status > 0) {
126 dev_dbg(dev, "charger on (USB)\n");
127 pdata->set_charge(PDA_POWER_CHARGE_USB);
128 } else {
129 dev_dbg(dev, "charger off\n");
130 pdata->set_charge(0);
131 }
132 } else if (ac_draw) {
133 if (new_ac_status > 0) {
134 regulator_set_current_limit(ac_draw, max_uA, max_uA);
135 if (!regulator_enabled) {
136 dev_dbg(dev, "charger on (AC)\n");
137 regulator_enable(ac_draw);
138 regulator_enabled = 1;
139 }
140 } else {
141 if (regulator_enabled) {
142 dev_dbg(dev, "charger off\n");
143 regulator_disable(ac_draw);
144 regulator_enabled = 0;
145 }
146 }
147 }
148 }
149
supply_timer_func(unsigned long unused)150 static void supply_timer_func(unsigned long unused)
151 {
152 if (ac_status == PDA_PSY_TO_CHANGE) {
153 ac_status = new_ac_status;
154 power_supply_changed(&pda_psy_ac);
155 }
156
157 if (usb_status == PDA_PSY_TO_CHANGE) {
158 usb_status = new_usb_status;
159 power_supply_changed(&pda_psy_usb);
160 }
161 }
162
psy_changed(void)163 static void psy_changed(void)
164 {
165 update_charger();
166
167 /*
168 * Okay, charger set. Now wait a bit before notifying supplicants,
169 * charge power should stabilize.
170 */
171 mod_timer(&supply_timer,
172 jiffies + msecs_to_jiffies(pdata->wait_for_charger));
173 }
174
charger_timer_func(unsigned long unused)175 static void charger_timer_func(unsigned long unused)
176 {
177 update_status();
178 psy_changed();
179 }
180
power_changed_isr(int irq,void * power_supply)181 static irqreturn_t power_changed_isr(int irq, void *power_supply)
182 {
183 if (power_supply == &pda_psy_ac)
184 ac_status = PDA_PSY_TO_CHANGE;
185 else if (power_supply == &pda_psy_usb)
186 usb_status = PDA_PSY_TO_CHANGE;
187 else
188 return IRQ_NONE;
189
190 /*
191 * Wait a bit before reading ac/usb line status and setting charger,
192 * because ac/usb status readings may lag from irq.
193 */
194 mod_timer(&charger_timer,
195 jiffies + msecs_to_jiffies(pdata->wait_for_status));
196
197 return IRQ_HANDLED;
198 }
199
polling_timer_func(unsigned long unused)200 static void polling_timer_func(unsigned long unused)
201 {
202 int changed = 0;
203
204 dev_dbg(dev, "polling...\n");
205
206 update_status();
207
208 if (!ac_irq && new_ac_status != ac_status) {
209 ac_status = PDA_PSY_TO_CHANGE;
210 changed = 1;
211 }
212
213 if (!usb_irq && new_usb_status != usb_status) {
214 usb_status = PDA_PSY_TO_CHANGE;
215 changed = 1;
216 }
217
218 if (changed)
219 psy_changed();
220
221 mod_timer(&polling_timer,
222 jiffies + msecs_to_jiffies(pdata->polling_interval));
223 }
224
225 #ifdef CONFIG_USB_OTG_UTILS
otg_is_usb_online(void)226 static int otg_is_usb_online(void)
227 {
228 return (transceiver->last_event == USB_EVENT_VBUS ||
229 transceiver->last_event == USB_EVENT_ENUMERATED);
230 }
231
otg_is_ac_online(void)232 static int otg_is_ac_online(void)
233 {
234 return (transceiver->last_event == USB_EVENT_CHARGER);
235 }
236
otg_handle_notification(struct notifier_block * nb,unsigned long event,void * unused)237 static int otg_handle_notification(struct notifier_block *nb,
238 unsigned long event, void *unused)
239 {
240 switch (event) {
241 case USB_EVENT_CHARGER:
242 ac_status = PDA_PSY_TO_CHANGE;
243 break;
244 case USB_EVENT_VBUS:
245 case USB_EVENT_ENUMERATED:
246 usb_status = PDA_PSY_TO_CHANGE;
247 break;
248 case USB_EVENT_NONE:
249 ac_status = PDA_PSY_TO_CHANGE;
250 usb_status = PDA_PSY_TO_CHANGE;
251 break;
252 default:
253 return NOTIFY_OK;
254 }
255
256 /*
257 * Wait a bit before reading ac/usb line status and setting charger,
258 * because ac/usb status readings may lag from irq.
259 */
260 mod_timer(&charger_timer,
261 jiffies + msecs_to_jiffies(pdata->wait_for_status));
262
263 return NOTIFY_OK;
264 }
265 #endif
266
pda_power_probe(struct platform_device * pdev)267 static int pda_power_probe(struct platform_device *pdev)
268 {
269 int ret = 0;
270
271 dev = &pdev->dev;
272
273 if (pdev->id != -1) {
274 dev_err(dev, "it's meaningless to register several "
275 "pda_powers; use id = -1\n");
276 ret = -EINVAL;
277 goto wrongid;
278 }
279
280 pdata = pdev->dev.platform_data;
281
282 if (pdata->init) {
283 ret = pdata->init(dev);
284 if (ret < 0)
285 goto init_failed;
286 }
287
288 update_status();
289 update_charger();
290
291 if (!pdata->wait_for_status)
292 pdata->wait_for_status = 500;
293
294 if (!pdata->wait_for_charger)
295 pdata->wait_for_charger = 500;
296
297 if (!pdata->polling_interval)
298 pdata->polling_interval = 2000;
299
300 if (!pdata->ac_max_uA)
301 pdata->ac_max_uA = 500000;
302
303 setup_timer(&charger_timer, charger_timer_func, 0);
304 setup_timer(&supply_timer, supply_timer_func, 0);
305
306 ac_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "ac");
307 usb_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "usb");
308
309 if (pdata->supplied_to) {
310 pda_psy_ac.supplied_to = pdata->supplied_to;
311 pda_psy_ac.num_supplicants = pdata->num_supplicants;
312 pda_psy_usb.supplied_to = pdata->supplied_to;
313 pda_psy_usb.num_supplicants = pdata->num_supplicants;
314 }
315
316 ac_draw = regulator_get(dev, "ac_draw");
317 if (IS_ERR(ac_draw)) {
318 dev_dbg(dev, "couldn't get ac_draw regulator\n");
319 ac_draw = NULL;
320 ret = PTR_ERR(ac_draw);
321 }
322
323 #ifdef CONFIG_USB_OTG_UTILS
324 transceiver = otg_get_transceiver();
325 if (transceiver && !pdata->is_usb_online) {
326 pdata->is_usb_online = otg_is_usb_online;
327 }
328 if (transceiver && !pdata->is_ac_online) {
329 pdata->is_ac_online = otg_is_ac_online;
330 }
331 #endif
332
333 if (pdata->is_ac_online) {
334 ret = power_supply_register(&pdev->dev, &pda_psy_ac);
335 if (ret) {
336 dev_err(dev, "failed to register %s power supply\n",
337 pda_psy_ac.name);
338 goto ac_supply_failed;
339 }
340
341 if (ac_irq) {
342 ret = request_irq(ac_irq->start, power_changed_isr,
343 get_irq_flags(ac_irq), ac_irq->name,
344 &pda_psy_ac);
345 if (ret) {
346 dev_err(dev, "request ac irq failed\n");
347 goto ac_irq_failed;
348 }
349 } else {
350 polling = 1;
351 }
352 }
353
354 if (pdata->is_usb_online) {
355 ret = power_supply_register(&pdev->dev, &pda_psy_usb);
356 if (ret) {
357 dev_err(dev, "failed to register %s power supply\n",
358 pda_psy_usb.name);
359 goto usb_supply_failed;
360 }
361
362 if (usb_irq) {
363 ret = request_irq(usb_irq->start, power_changed_isr,
364 get_irq_flags(usb_irq),
365 usb_irq->name, &pda_psy_usb);
366 if (ret) {
367 dev_err(dev, "request usb irq failed\n");
368 goto usb_irq_failed;
369 }
370 } else {
371 polling = 1;
372 }
373 }
374
375 #ifdef CONFIG_USB_OTG_UTILS
376 if (transceiver && pdata->use_otg_notifier) {
377 otg_nb.notifier_call = otg_handle_notification;
378 ret = otg_register_notifier(transceiver, &otg_nb);
379 if (ret) {
380 dev_err(dev, "failure to register otg notifier\n");
381 goto otg_reg_notifier_failed;
382 }
383 polling = 0;
384 }
385 #endif
386
387 if (polling) {
388 dev_dbg(dev, "will poll for status\n");
389 setup_timer(&polling_timer, polling_timer_func, 0);
390 mod_timer(&polling_timer,
391 jiffies + msecs_to_jiffies(pdata->polling_interval));
392 }
393
394 if (ac_irq || usb_irq)
395 device_init_wakeup(&pdev->dev, 1);
396
397 return 0;
398
399 #ifdef CONFIG_USB_OTG_UTILS
400 otg_reg_notifier_failed:
401 if (pdata->is_usb_online && usb_irq)
402 free_irq(usb_irq->start, &pda_psy_usb);
403 #endif
404 usb_irq_failed:
405 if (pdata->is_usb_online)
406 power_supply_unregister(&pda_psy_usb);
407 usb_supply_failed:
408 if (pdata->is_ac_online && ac_irq)
409 free_irq(ac_irq->start, &pda_psy_ac);
410 #ifdef CONFIG_USB_OTG_UTILS
411 if (transceiver)
412 otg_put_transceiver(transceiver);
413 #endif
414 ac_irq_failed:
415 if (pdata->is_ac_online)
416 power_supply_unregister(&pda_psy_ac);
417 ac_supply_failed:
418 if (ac_draw) {
419 regulator_put(ac_draw);
420 ac_draw = NULL;
421 }
422 if (pdata->exit)
423 pdata->exit(dev);
424 init_failed:
425 wrongid:
426 return ret;
427 }
428
pda_power_remove(struct platform_device * pdev)429 static int pda_power_remove(struct platform_device *pdev)
430 {
431 if (pdata->is_usb_online && usb_irq)
432 free_irq(usb_irq->start, &pda_psy_usb);
433 if (pdata->is_ac_online && ac_irq)
434 free_irq(ac_irq->start, &pda_psy_ac);
435
436 if (polling)
437 del_timer_sync(&polling_timer);
438 del_timer_sync(&charger_timer);
439 del_timer_sync(&supply_timer);
440
441 if (pdata->is_usb_online)
442 power_supply_unregister(&pda_psy_usb);
443 if (pdata->is_ac_online)
444 power_supply_unregister(&pda_psy_ac);
445 #ifdef CONFIG_USB_OTG_UTILS
446 if (transceiver)
447 otg_put_transceiver(transceiver);
448 #endif
449 if (ac_draw) {
450 regulator_put(ac_draw);
451 ac_draw = NULL;
452 }
453 if (pdata->exit)
454 pdata->exit(dev);
455
456 return 0;
457 }
458
459 #ifdef CONFIG_PM
460 static int ac_wakeup_enabled;
461 static int usb_wakeup_enabled;
462
pda_power_suspend(struct platform_device * pdev,pm_message_t state)463 static int pda_power_suspend(struct platform_device *pdev, pm_message_t state)
464 {
465 if (pdata->suspend) {
466 int ret = pdata->suspend(state);
467
468 if (ret)
469 return ret;
470 }
471
472 if (device_may_wakeup(&pdev->dev)) {
473 if (ac_irq)
474 ac_wakeup_enabled = !enable_irq_wake(ac_irq->start);
475 if (usb_irq)
476 usb_wakeup_enabled = !enable_irq_wake(usb_irq->start);
477 }
478
479 return 0;
480 }
481
pda_power_resume(struct platform_device * pdev)482 static int pda_power_resume(struct platform_device *pdev)
483 {
484 if (device_may_wakeup(&pdev->dev)) {
485 if (usb_irq && usb_wakeup_enabled)
486 disable_irq_wake(usb_irq->start);
487 if (ac_irq && ac_wakeup_enabled)
488 disable_irq_wake(ac_irq->start);
489 }
490
491 if (pdata->resume)
492 return pdata->resume();
493
494 return 0;
495 }
496 #else
497 #define pda_power_suspend NULL
498 #define pda_power_resume NULL
499 #endif /* CONFIG_PM */
500
501 static struct platform_driver pda_power_pdrv = {
502 .driver = {
503 .name = "pda-power",
504 },
505 .probe = pda_power_probe,
506 .remove = pda_power_remove,
507 .suspend = pda_power_suspend,
508 .resume = pda_power_resume,
509 };
510
511 module_platform_driver(pda_power_pdrv);
512
513 MODULE_LICENSE("GPL");
514 MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>");
515 MODULE_ALIAS("platform:pda-power");
516