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 delayed_work charger_work;
34 static struct delayed_work polling_work;
35 static struct delayed_work supply_work;
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_work_func(struct work_struct * work)143 static void supply_work_func(struct work_struct *work)
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 cancel_delayed_work(&supply_work);
165 schedule_delayed_work(&supply_work,
166 msecs_to_jiffies(pdata->wait_for_charger));
167 }
168
charger_work_func(struct work_struct * work)169 static void charger_work_func(struct work_struct *work)
170 {
171 update_status();
172 psy_changed();
173 }
174
power_changed_isr(int irq,void * power_supply)175 static irqreturn_t power_changed_isr(int irq, void *power_supply)
176 {
177 if (power_supply == pda_psy_ac)
178 ac_status = PDA_PSY_TO_CHANGE;
179 else if (power_supply == pda_psy_usb)
180 usb_status = PDA_PSY_TO_CHANGE;
181 else
182 return IRQ_NONE;
183
184 /*
185 * Wait a bit before reading ac/usb line status and setting charger,
186 * because ac/usb status readings may lag from irq.
187 */
188 cancel_delayed_work(&charger_work);
189 schedule_delayed_work(&charger_work,
190 msecs_to_jiffies(pdata->wait_for_status));
191
192 return IRQ_HANDLED;
193 }
194
polling_work_func(struct work_struct * work)195 static void polling_work_func(struct work_struct *work)
196 {
197 int changed = 0;
198
199 dev_dbg(dev, "polling...\n");
200
201 update_status();
202
203 if (!ac_irq && new_ac_status != ac_status) {
204 ac_status = PDA_PSY_TO_CHANGE;
205 changed = 1;
206 }
207
208 if (!usb_irq && new_usb_status != usb_status) {
209 usb_status = PDA_PSY_TO_CHANGE;
210 changed = 1;
211 }
212
213 if (changed)
214 psy_changed();
215
216 cancel_delayed_work(&polling_work);
217 schedule_delayed_work(&polling_work,
218 msecs_to_jiffies(pdata->polling_interval));
219 }
220
221 #if IS_ENABLED(CONFIG_USB_PHY)
otg_is_usb_online(void)222 static int otg_is_usb_online(void)
223 {
224 return (transceiver->last_event == USB_EVENT_VBUS ||
225 transceiver->last_event == USB_EVENT_ENUMERATED);
226 }
227
otg_is_ac_online(void)228 static int otg_is_ac_online(void)
229 {
230 return (transceiver->last_event == USB_EVENT_CHARGER);
231 }
232
otg_handle_notification(struct notifier_block * nb,unsigned long event,void * unused)233 static int otg_handle_notification(struct notifier_block *nb,
234 unsigned long event, void *unused)
235 {
236 switch (event) {
237 case USB_EVENT_CHARGER:
238 ac_status = PDA_PSY_TO_CHANGE;
239 break;
240 case USB_EVENT_VBUS:
241 case USB_EVENT_ENUMERATED:
242 usb_status = PDA_PSY_TO_CHANGE;
243 break;
244 case USB_EVENT_NONE:
245 ac_status = PDA_PSY_TO_CHANGE;
246 usb_status = PDA_PSY_TO_CHANGE;
247 break;
248 default:
249 return NOTIFY_OK;
250 }
251
252 /*
253 * Wait a bit before reading ac/usb line status and setting charger,
254 * because ac/usb status readings may lag from irq.
255 */
256 cancel_delayed_work(&charger_work);
257 schedule_delayed_work(&charger_work,
258 msecs_to_jiffies(pdata->wait_for_status));
259
260 return NOTIFY_OK;
261 }
262 #endif
263
pda_power_probe(struct platform_device * pdev)264 static int pda_power_probe(struct platform_device *pdev)
265 {
266 struct power_supply_config psy_cfg = {};
267 int ret = 0;
268
269 dev = &pdev->dev;
270
271 if (pdev->id != -1) {
272 dev_err(dev, "it's meaningless to register several "
273 "pda_powers; use id = -1\n");
274 ret = -EINVAL;
275 goto wrongid;
276 }
277
278 pdata = pdev->dev.platform_data;
279
280 if (pdata->init) {
281 ret = pdata->init(dev);
282 if (ret < 0)
283 goto init_failed;
284 }
285
286 ac_draw = regulator_get(dev, "ac_draw");
287 if (IS_ERR(ac_draw)) {
288 dev_dbg(dev, "couldn't get ac_draw regulator\n");
289 ac_draw = NULL;
290 }
291
292 update_status();
293 update_charger();
294
295 if (!pdata->wait_for_status)
296 pdata->wait_for_status = 500;
297
298 if (!pdata->wait_for_charger)
299 pdata->wait_for_charger = 500;
300
301 if (!pdata->polling_interval)
302 pdata->polling_interval = 2000;
303
304 if (!pdata->ac_max_uA)
305 pdata->ac_max_uA = 500000;
306
307 INIT_DELAYED_WORK(&charger_work, charger_work_func);
308 INIT_DELAYED_WORK(&supply_work, supply_work_func);
309
310 ac_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "ac");
311 usb_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "usb");
312
313 if (pdata->supplied_to) {
314 psy_cfg.supplied_to = pdata->supplied_to;
315 psy_cfg.num_supplicants = pdata->num_supplicants;
316 } else {
317 psy_cfg.supplied_to = pda_power_supplied_to;
318 psy_cfg.num_supplicants = ARRAY_SIZE(pda_power_supplied_to);
319 }
320
321 #if IS_ENABLED(CONFIG_USB_PHY)
322 transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
323 if (!IS_ERR_OR_NULL(transceiver)) {
324 if (!pdata->is_usb_online)
325 pdata->is_usb_online = otg_is_usb_online;
326 if (!pdata->is_ac_online)
327 pdata->is_ac_online = otg_is_ac_online;
328 }
329 #endif
330
331 if (pdata->is_ac_online) {
332 pda_psy_ac = power_supply_register(&pdev->dev,
333 &pda_psy_ac_desc, &psy_cfg);
334 if (IS_ERR(pda_psy_ac)) {
335 dev_err(dev, "failed to register %s power supply\n",
336 pda_psy_ac_desc.name);
337 ret = PTR_ERR(pda_psy_ac);
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 pda_psy_usb = power_supply_register(&pdev->dev,
356 &pda_psy_usb_desc,
357 &psy_cfg);
358 if (IS_ERR(pda_psy_usb)) {
359 dev_err(dev, "failed to register %s power supply\n",
360 pda_psy_usb_desc.name);
361 ret = PTR_ERR(pda_psy_usb);
362 goto usb_supply_failed;
363 }
364
365 if (usb_irq) {
366 ret = request_irq(usb_irq->start, power_changed_isr,
367 get_irq_flags(usb_irq),
368 usb_irq->name, pda_psy_usb);
369 if (ret) {
370 dev_err(dev, "request usb irq failed\n");
371 goto usb_irq_failed;
372 }
373 } else {
374 polling = 1;
375 }
376 }
377
378 #if IS_ENABLED(CONFIG_USB_PHY)
379 if (!IS_ERR_OR_NULL(transceiver) && pdata->use_otg_notifier) {
380 otg_nb.notifier_call = otg_handle_notification;
381 ret = usb_register_notifier(transceiver, &otg_nb);
382 if (ret) {
383 dev_err(dev, "failure to register otg notifier\n");
384 goto otg_reg_notifier_failed;
385 }
386 polling = 0;
387 }
388 #endif
389
390 if (polling) {
391 dev_dbg(dev, "will poll for status\n");
392 INIT_DELAYED_WORK(&polling_work, polling_work_func);
393 cancel_delayed_work(&polling_work);
394 schedule_delayed_work(&polling_work,
395 msecs_to_jiffies(pdata->polling_interval));
396 }
397
398 if (ac_irq || usb_irq)
399 device_init_wakeup(&pdev->dev, 1);
400
401 return 0;
402
403 #if IS_ENABLED(CONFIG_USB_PHY)
404 otg_reg_notifier_failed:
405 if (pdata->is_usb_online && usb_irq)
406 free_irq(usb_irq->start, pda_psy_usb);
407 #endif
408 usb_irq_failed:
409 if (pdata->is_usb_online)
410 power_supply_unregister(pda_psy_usb);
411 usb_supply_failed:
412 if (pdata->is_ac_online && ac_irq)
413 free_irq(ac_irq->start, pda_psy_ac);
414 #if IS_ENABLED(CONFIG_USB_PHY)
415 if (!IS_ERR_OR_NULL(transceiver))
416 usb_put_phy(transceiver);
417 #endif
418 ac_irq_failed:
419 if (pdata->is_ac_online)
420 power_supply_unregister(pda_psy_ac);
421 ac_supply_failed:
422 if (ac_draw) {
423 regulator_put(ac_draw);
424 ac_draw = NULL;
425 }
426 if (pdata->exit)
427 pdata->exit(dev);
428 init_failed:
429 wrongid:
430 return ret;
431 }
432
pda_power_remove(struct platform_device * pdev)433 static int pda_power_remove(struct platform_device *pdev)
434 {
435 if (pdata->is_usb_online && usb_irq)
436 free_irq(usb_irq->start, pda_psy_usb);
437 if (pdata->is_ac_online && ac_irq)
438 free_irq(ac_irq->start, pda_psy_ac);
439
440 if (polling)
441 cancel_delayed_work_sync(&polling_work);
442 cancel_delayed_work_sync(&charger_work);
443 cancel_delayed_work_sync(&supply_work);
444
445 if (pdata->is_usb_online)
446 power_supply_unregister(pda_psy_usb);
447 if (pdata->is_ac_online)
448 power_supply_unregister(pda_psy_ac);
449 #if IS_ENABLED(CONFIG_USB_PHY)
450 if (!IS_ERR_OR_NULL(transceiver))
451 usb_put_phy(transceiver);
452 #endif
453 if (ac_draw) {
454 regulator_put(ac_draw);
455 ac_draw = NULL;
456 }
457 if (pdata->exit)
458 pdata->exit(dev);
459
460 return 0;
461 }
462
463 #ifdef CONFIG_PM
464 static int ac_wakeup_enabled;
465 static int usb_wakeup_enabled;
466
pda_power_suspend(struct platform_device * pdev,pm_message_t state)467 static int pda_power_suspend(struct platform_device *pdev, pm_message_t state)
468 {
469 if (pdata->suspend) {
470 int ret = pdata->suspend(state);
471
472 if (ret)
473 return ret;
474 }
475
476 if (device_may_wakeup(&pdev->dev)) {
477 if (ac_irq)
478 ac_wakeup_enabled = !enable_irq_wake(ac_irq->start);
479 if (usb_irq)
480 usb_wakeup_enabled = !enable_irq_wake(usb_irq->start);
481 }
482
483 return 0;
484 }
485
pda_power_resume(struct platform_device * pdev)486 static int pda_power_resume(struct platform_device *pdev)
487 {
488 if (device_may_wakeup(&pdev->dev)) {
489 if (usb_irq && usb_wakeup_enabled)
490 disable_irq_wake(usb_irq->start);
491 if (ac_irq && ac_wakeup_enabled)
492 disable_irq_wake(ac_irq->start);
493 }
494
495 if (pdata->resume)
496 return pdata->resume();
497
498 return 0;
499 }
500 #else
501 #define pda_power_suspend NULL
502 #define pda_power_resume NULL
503 #endif /* CONFIG_PM */
504
505 static struct platform_driver pda_power_pdrv = {
506 .driver = {
507 .name = "pda-power",
508 },
509 .probe = pda_power_probe,
510 .remove = pda_power_remove,
511 .suspend = pda_power_suspend,
512 .resume = pda_power_resume,
513 };
514
515 module_platform_driver(pda_power_pdrv);
516
517 MODULE_LICENSE("GPL");
518 MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>");
519 MODULE_ALIAS("platform:pda-power");
520