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 return IRQF_SHARED | (res->flags & IRQF_TRIGGER_MASK);
28 }
29
30 static struct device *dev;
31 static struct pda_power_pdata *pdata;
32 static struct resource *ac_irq, *usb_irq;
33 static struct timer_list charger_timer;
34 static struct timer_list supply_timer;
35 static struct timer_list polling_timer;
36 static int polling;
37 static struct power_supply *pda_psy_ac, *pda_psy_usb;
38
39 #if IS_ENABLED(CONFIG_USB_PHY)
40 static struct usb_phy *transceiver;
41 static struct notifier_block otg_nb;
42 #endif
43
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
pda_power_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)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->desc->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 const struct power_supply_desc pda_psy_ac_desc = {
85 .name = "ac",
86 .type = POWER_SUPPLY_TYPE_MAINS,
87 .properties = pda_power_props,
88 .num_properties = ARRAY_SIZE(pda_power_props),
89 .get_property = pda_power_get_property,
90 };
91
92 static const struct power_supply_desc pda_psy_usb_desc = {
93 .name = "usb",
94 .type = POWER_SUPPLY_TYPE_USB,
95 .properties = pda_power_props,
96 .num_properties = ARRAY_SIZE(pda_power_props),
97 .get_property = pda_power_get_property,
98 };
99
update_status(void)100 static void update_status(void)
101 {
102 if (pdata->is_ac_online)
103 new_ac_status = !!pdata->is_ac_online();
104
105 if (pdata->is_usb_online)
106 new_usb_status = !!pdata->is_usb_online();
107 }
108
update_charger(void)109 static void update_charger(void)
110 {
111 static int regulator_enabled;
112 int max_uA = pdata->ac_max_uA;
113
114 if (pdata->set_charge) {
115 if (new_ac_status > 0) {
116 dev_dbg(dev, "charger on (AC)\n");
117 pdata->set_charge(PDA_POWER_CHARGE_AC);
118 } else if (new_usb_status > 0) {
119 dev_dbg(dev, "charger on (USB)\n");
120 pdata->set_charge(PDA_POWER_CHARGE_USB);
121 } else {
122 dev_dbg(dev, "charger off\n");
123 pdata->set_charge(0);
124 }
125 } else if (ac_draw) {
126 if (new_ac_status > 0) {
127 regulator_set_current_limit(ac_draw, max_uA, max_uA);
128 if (!regulator_enabled) {
129 dev_dbg(dev, "charger on (AC)\n");
130 WARN_ON(regulator_enable(ac_draw));
131 regulator_enabled = 1;
132 }
133 } else {
134 if (regulator_enabled) {
135 dev_dbg(dev, "charger off\n");
136 WARN_ON(regulator_disable(ac_draw));
137 regulator_enabled = 0;
138 }
139 }
140 }
141 }
142
supply_timer_func(unsigned long unused)143 static void supply_timer_func(unsigned long unused)
144 {
145 if (ac_status == PDA_PSY_TO_CHANGE) {
146 ac_status = new_ac_status;
147 power_supply_changed(pda_psy_ac);
148 }
149
150 if (usb_status == PDA_PSY_TO_CHANGE) {
151 usb_status = new_usb_status;
152 power_supply_changed(pda_psy_usb);
153 }
154 }
155
psy_changed(void)156 static void psy_changed(void)
157 {
158 update_charger();
159
160 /*
161 * Okay, charger set. Now wait a bit before notifying supplicants,
162 * charge power should stabilize.
163 */
164 mod_timer(&supply_timer,
165 jiffies + msecs_to_jiffies(pdata->wait_for_charger));
166 }
167
charger_timer_func(unsigned long unused)168 static void charger_timer_func(unsigned long unused)
169 {
170 update_status();
171 psy_changed();
172 }
173
power_changed_isr(int irq,void * power_supply)174 static irqreturn_t power_changed_isr(int irq, void *power_supply)
175 {
176 if (power_supply == pda_psy_ac)
177 ac_status = PDA_PSY_TO_CHANGE;
178 else if (power_supply == pda_psy_usb)
179 usb_status = PDA_PSY_TO_CHANGE;
180 else
181 return IRQ_NONE;
182
183 /*
184 * Wait a bit before reading ac/usb line status and setting charger,
185 * because ac/usb status readings may lag from irq.
186 */
187 mod_timer(&charger_timer,
188 jiffies + msecs_to_jiffies(pdata->wait_for_status));
189
190 return IRQ_HANDLED;
191 }
192
polling_timer_func(unsigned long unused)193 static void polling_timer_func(unsigned long unused)
194 {
195 int changed = 0;
196
197 dev_dbg(dev, "polling...\n");
198
199 update_status();
200
201 if (!ac_irq && new_ac_status != ac_status) {
202 ac_status = PDA_PSY_TO_CHANGE;
203 changed = 1;
204 }
205
206 if (!usb_irq && new_usb_status != usb_status) {
207 usb_status = PDA_PSY_TO_CHANGE;
208 changed = 1;
209 }
210
211 if (changed)
212 psy_changed();
213
214 mod_timer(&polling_timer,
215 jiffies + msecs_to_jiffies(pdata->polling_interval));
216 }
217
218 #if IS_ENABLED(CONFIG_USB_PHY)
otg_is_usb_online(void)219 static int otg_is_usb_online(void)
220 {
221 return (transceiver->last_event == USB_EVENT_VBUS ||
222 transceiver->last_event == USB_EVENT_ENUMERATED);
223 }
224
otg_is_ac_online(void)225 static int otg_is_ac_online(void)
226 {
227 return (transceiver->last_event == USB_EVENT_CHARGER);
228 }
229
otg_handle_notification(struct notifier_block * nb,unsigned long event,void * unused)230 static int otg_handle_notification(struct notifier_block *nb,
231 unsigned long event, void *unused)
232 {
233 switch (event) {
234 case USB_EVENT_CHARGER:
235 ac_status = PDA_PSY_TO_CHANGE;
236 break;
237 case USB_EVENT_VBUS:
238 case USB_EVENT_ENUMERATED:
239 usb_status = PDA_PSY_TO_CHANGE;
240 break;
241 case USB_EVENT_NONE:
242 ac_status = PDA_PSY_TO_CHANGE;
243 usb_status = PDA_PSY_TO_CHANGE;
244 break;
245 default:
246 return NOTIFY_OK;
247 }
248
249 /*
250 * Wait a bit before reading ac/usb line status and setting charger,
251 * because ac/usb status readings may lag from irq.
252 */
253 mod_timer(&charger_timer,
254 jiffies + msecs_to_jiffies(pdata->wait_for_status));
255
256 return NOTIFY_OK;
257 }
258 #endif
259
pda_power_probe(struct platform_device * pdev)260 static int pda_power_probe(struct platform_device *pdev)
261 {
262 struct power_supply_config psy_cfg = {};
263 int ret = 0;
264
265 dev = &pdev->dev;
266
267 if (pdev->id != -1) {
268 dev_err(dev, "it's meaningless to register several "
269 "pda_powers; use id = -1\n");
270 ret = -EINVAL;
271 goto wrongid;
272 }
273
274 pdata = pdev->dev.platform_data;
275
276 if (pdata->init) {
277 ret = pdata->init(dev);
278 if (ret < 0)
279 goto init_failed;
280 }
281
282 ac_draw = regulator_get(dev, "ac_draw");
283 if (IS_ERR(ac_draw)) {
284 dev_dbg(dev, "couldn't get ac_draw regulator\n");
285 ac_draw = NULL;
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 psy_cfg.supplied_to = pdata->supplied_to;
311 psy_cfg.num_supplicants = pdata->num_supplicants;
312 } else {
313 psy_cfg.supplied_to = pda_power_supplied_to;
314 psy_cfg.num_supplicants = ARRAY_SIZE(pda_power_supplied_to);
315 }
316
317 #if IS_ENABLED(CONFIG_USB_PHY)
318 transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
319 if (!IS_ERR_OR_NULL(transceiver)) {
320 if (!pdata->is_usb_online)
321 pdata->is_usb_online = otg_is_usb_online;
322 if (!pdata->is_ac_online)
323 pdata->is_ac_online = otg_is_ac_online;
324 }
325 #endif
326
327 if (pdata->is_ac_online) {
328 pda_psy_ac = power_supply_register(&pdev->dev,
329 &pda_psy_ac_desc, &psy_cfg);
330 if (IS_ERR(pda_psy_ac)) {
331 dev_err(dev, "failed to register %s power supply\n",
332 pda_psy_ac_desc.name);
333 ret = PTR_ERR(pda_psy_ac);
334 goto ac_supply_failed;
335 }
336
337 if (ac_irq) {
338 ret = request_irq(ac_irq->start, power_changed_isr,
339 get_irq_flags(ac_irq), ac_irq->name,
340 pda_psy_ac);
341 if (ret) {
342 dev_err(dev, "request ac irq failed\n");
343 goto ac_irq_failed;
344 }
345 } else {
346 polling = 1;
347 }
348 }
349
350 if (pdata->is_usb_online) {
351 pda_psy_usb = power_supply_register(&pdev->dev,
352 &pda_psy_usb_desc,
353 &psy_cfg);
354 if (IS_ERR(pda_psy_usb)) {
355 dev_err(dev, "failed to register %s power supply\n",
356 pda_psy_usb_desc.name);
357 ret = PTR_ERR(pda_psy_usb);
358 goto usb_supply_failed;
359 }
360
361 if (usb_irq) {
362 ret = request_irq(usb_irq->start, power_changed_isr,
363 get_irq_flags(usb_irq),
364 usb_irq->name, pda_psy_usb);
365 if (ret) {
366 dev_err(dev, "request usb irq failed\n");
367 goto usb_irq_failed;
368 }
369 } else {
370 polling = 1;
371 }
372 }
373
374 #if IS_ENABLED(CONFIG_USB_PHY)
375 if (!IS_ERR_OR_NULL(transceiver) && pdata->use_otg_notifier) {
376 otg_nb.notifier_call = otg_handle_notification;
377 ret = usb_register_notifier(transceiver, &otg_nb);
378 if (ret) {
379 dev_err(dev, "failure to register otg notifier\n");
380 goto otg_reg_notifier_failed;
381 }
382 polling = 0;
383 }
384 #endif
385
386 if (polling) {
387 dev_dbg(dev, "will poll for status\n");
388 setup_timer(&polling_timer, polling_timer_func, 0);
389 mod_timer(&polling_timer,
390 jiffies + msecs_to_jiffies(pdata->polling_interval));
391 }
392
393 if (ac_irq || usb_irq)
394 device_init_wakeup(&pdev->dev, 1);
395
396 return 0;
397
398 #if IS_ENABLED(CONFIG_USB_PHY)
399 otg_reg_notifier_failed:
400 if (pdata->is_usb_online && usb_irq)
401 free_irq(usb_irq->start, pda_psy_usb);
402 #endif
403 usb_irq_failed:
404 if (pdata->is_usb_online)
405 power_supply_unregister(pda_psy_usb);
406 usb_supply_failed:
407 if (pdata->is_ac_online && ac_irq)
408 free_irq(ac_irq->start, pda_psy_ac);
409 #if IS_ENABLED(CONFIG_USB_PHY)
410 if (!IS_ERR_OR_NULL(transceiver))
411 usb_put_phy(transceiver);
412 #endif
413 ac_irq_failed:
414 if (pdata->is_ac_online)
415 power_supply_unregister(pda_psy_ac);
416 ac_supply_failed:
417 if (ac_draw) {
418 regulator_put(ac_draw);
419 ac_draw = NULL;
420 }
421 if (pdata->exit)
422 pdata->exit(dev);
423 init_failed:
424 wrongid:
425 return ret;
426 }
427
pda_power_remove(struct platform_device * pdev)428 static int pda_power_remove(struct platform_device *pdev)
429 {
430 if (pdata->is_usb_online && usb_irq)
431 free_irq(usb_irq->start, pda_psy_usb);
432 if (pdata->is_ac_online && ac_irq)
433 free_irq(ac_irq->start, pda_psy_ac);
434
435 if (polling)
436 del_timer_sync(&polling_timer);
437 del_timer_sync(&charger_timer);
438 del_timer_sync(&supply_timer);
439
440 if (pdata->is_usb_online)
441 power_supply_unregister(pda_psy_usb);
442 if (pdata->is_ac_online)
443 power_supply_unregister(pda_psy_ac);
444 #if IS_ENABLED(CONFIG_USB_PHY)
445 if (!IS_ERR_OR_NULL(transceiver))
446 usb_put_phy(transceiver);
447 #endif
448 if (ac_draw) {
449 regulator_put(ac_draw);
450 ac_draw = NULL;
451 }
452 if (pdata->exit)
453 pdata->exit(dev);
454
455 return 0;
456 }
457
458 #ifdef CONFIG_PM
459 static int ac_wakeup_enabled;
460 static int usb_wakeup_enabled;
461
pda_power_suspend(struct platform_device * pdev,pm_message_t state)462 static int pda_power_suspend(struct platform_device *pdev, pm_message_t state)
463 {
464 if (pdata->suspend) {
465 int ret = pdata->suspend(state);
466
467 if (ret)
468 return ret;
469 }
470
471 if (device_may_wakeup(&pdev->dev)) {
472 if (ac_irq)
473 ac_wakeup_enabled = !enable_irq_wake(ac_irq->start);
474 if (usb_irq)
475 usb_wakeup_enabled = !enable_irq_wake(usb_irq->start);
476 }
477
478 return 0;
479 }
480
pda_power_resume(struct platform_device * pdev)481 static int pda_power_resume(struct platform_device *pdev)
482 {
483 if (device_may_wakeup(&pdev->dev)) {
484 if (usb_irq && usb_wakeup_enabled)
485 disable_irq_wake(usb_irq->start);
486 if (ac_irq && ac_wakeup_enabled)
487 disable_irq_wake(ac_irq->start);
488 }
489
490 if (pdata->resume)
491 return pdata->resume();
492
493 return 0;
494 }
495 #else
496 #define pda_power_suspend NULL
497 #define pda_power_resume NULL
498 #endif /* CONFIG_PM */
499
500 static struct platform_driver pda_power_pdrv = {
501 .driver = {
502 .name = "pda-power",
503 },
504 .probe = pda_power_probe,
505 .remove = pda_power_remove,
506 .suspend = pda_power_suspend,
507 .resume = pda_power_resume,
508 };
509
510 module_platform_driver(pda_power_pdrv);
511
512 MODULE_LICENSE("GPL");
513 MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>");
514 MODULE_ALIAS("platform:pda-power");
515