blob: a232de6a57037599f23dd8e99b2a2857f5c443a9 [file] [log] [blame]
Anton Vorontsovb2998042007-05-04 00:32:17 +04001/*
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>
Philipp Zabel5bf2b992009-01-18 17:40:27 +010015#include <linux/err.h>
Anton Vorontsovb2998042007-05-04 00:32:17 +040016#include <linux/interrupt.h>
17#include <linux/power_supply.h>
18#include <linux/pda_power.h>
Philipp Zabel5bf2b992009-01-18 17:40:27 +010019#include <linux/regulator/consumer.h>
Anton Vorontsovb2998042007-05-04 00:32:17 +040020#include <linux/timer.h>
21#include <linux/jiffies.h>
Philipp Zabel5bf2b992009-01-18 17:40:27 +010022#include <linux/usb/otg.h>
Anton Vorontsovb2998042007-05-04 00:32:17 +040023
24static inline unsigned int get_irq_flags(struct resource *res)
25{
Philipp Zabel74194cc2009-01-18 14:46:21 +010026 unsigned int flags = IRQF_SAMPLE_RANDOM | IRQF_SHARED;
Anton Vorontsovb2998042007-05-04 00:32:17 +040027
28 flags |= res->flags & IRQF_TRIGGER_MASK;
29
30 return flags;
31}
32
33static struct device *dev;
34static struct pda_power_pdata *pdata;
35static struct resource *ac_irq, *usb_irq;
36static struct timer_list charger_timer;
37static struct timer_list supply_timer;
Anton Vorontsovc3caeba2008-01-13 02:44:20 +030038static struct timer_list polling_timer;
39static int polling;
Anton Vorontsovb2998042007-05-04 00:32:17 +040040
Philipp Zabel5bf2b992009-01-18 17:40:27 +010041#ifdef CONFIG_USB_OTG_UTILS
42static struct otg_transceiver *transceiver;
43#endif
44static struct regulator *ac_draw;
45
Anton Vorontsovbfde2662008-01-13 02:39:17 +030046enum {
47 PDA_PSY_OFFLINE = 0,
48 PDA_PSY_ONLINE = 1,
49 PDA_PSY_TO_CHANGE,
50};
51static int new_ac_status = -1;
52static int new_usb_status = -1;
53static int ac_status = -1;
54static int usb_status = -1;
55
Anton Vorontsovb2998042007-05-04 00:32:17 +040056static 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
75static enum power_supply_property pda_power_props[] = {
76 POWER_SUPPLY_PROP_ONLINE,
77};
78
79static char *pda_power_supplied_to[] = {
80 "main-battery",
81 "backup-battery",
82};
83
Anton Vorontsovbfde2662008-01-13 02:39:17 +030084static 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,
Anton Vorontsovb2998042007-05-04 00:32:17 +040092};
93
Anton Vorontsovbfde2662008-01-13 02:39:17 +030094static 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
104static 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
Anton Vorontsovb2998042007-05-04 00:32:17 +0400113static void update_charger(void)
114{
Philipp Zabel5bf2b992009-01-18 17:40:27 +0100115 static int regulator_enabled;
116 int max_uA = pdata->ac_max_uA;
Anton Vorontsovb2998042007-05-04 00:32:17 +0400117
Philipp Zabel5bf2b992009-01-18 17:40:27 +0100118 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 }
Anton Vorontsovb2998042007-05-04 00:32:17 +0400144 }
Anton Vorontsovb2998042007-05-04 00:32:17 +0400145}
146
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300147static void supply_timer_func(unsigned long unused)
Anton Vorontsovb2998042007-05-04 00:32:17 +0400148{
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300149 if (ac_status == PDA_PSY_TO_CHANGE) {
150 ac_status = new_ac_status;
151 power_supply_changed(&pda_psy_ac);
152 }
Jeff Garzik5ebf6e62007-07-14 19:12:04 -0400153
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300154 if (usb_status == PDA_PSY_TO_CHANGE) {
155 usb_status = new_usb_status;
156 power_supply_changed(&pda_psy_usb);
157 }
Anton Vorontsovb2998042007-05-04 00:32:17 +0400158}
159
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300160static void psy_changed(void)
Anton Vorontsovb2998042007-05-04 00:32:17 +0400161{
162 update_charger();
163
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300164 /*
165 * Okay, charger set. Now wait a bit before notifying supplicants,
166 * charge power should stabilize.
167 */
Anton Vorontsovb2998042007-05-04 00:32:17 +0400168 mod_timer(&supply_timer,
169 jiffies + msecs_to_jiffies(pdata->wait_for_charger));
Anton Vorontsovb2998042007-05-04 00:32:17 +0400170}
171
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300172static void charger_timer_func(unsigned long unused)
173{
174 update_status();
175 psy_changed();
176}
177
Jeff Garzik5ebf6e62007-07-14 19:12:04 -0400178static irqreturn_t power_changed_isr(int irq, void *power_supply)
Anton Vorontsovb2998042007-05-04 00:32:17 +0400179{
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300180 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 */
Anton Vorontsovb2998042007-05-04 00:32:17 +0400191 mod_timer(&charger_timer,
192 jiffies + msecs_to_jiffies(pdata->wait_for_status));
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300193
Anton Vorontsovb2998042007-05-04 00:32:17 +0400194 return IRQ_HANDLED;
195}
196
Anton Vorontsovc3caeba2008-01-13 02:44:20 +0300197static 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
Philipp Zabel5bf2b992009-01-18 17:40:27 +0100222#ifdef CONFIG_USB_OTG_UTILS
223static int otg_is_usb_online(void)
224{
225 return (transceiver->state == OTG_STATE_B_PERIPHERAL);
226}
227#endif
228
Anton Vorontsovb2998042007-05-04 00:32:17 +0400229static 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
Philipp Zabelf6b6b182008-04-12 13:47:45 +0200244 if (pdata->init) {
245 ret = pdata->init(dev);
246 if (ret < 0)
247 goto init_failed;
248 }
249
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300250 update_status();
Anton Vorontsovb2998042007-05-04 00:32:17 +0400251 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
Anton Vorontsovc3caeba2008-01-13 02:44:20 +0300259 if (!pdata->polling_interval)
260 pdata->polling_interval = 2000;
261
Philipp Zabel5bf2b992009-01-18 17:40:27 +0100262 if (!pdata->ac_max_uA)
263 pdata->ac_max_uA = 500000;
264
Anton Vorontsovb2998042007-05-04 00:32:17 +0400265 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");
Anton Vorontsovb2998042007-05-04 00:32:17 +0400270
271 if (pdata->supplied_to) {
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300272 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;
Anton Vorontsovb2998042007-05-04 00:32:17 +0400276 }
277
Philipp Zabel5bf2b992009-01-18 17:40:27 +0100278 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
Dmitry Baryshkov9ef45102008-01-07 04:12:39 +0300285 if (pdata->is_ac_online) {
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300286 ret = power_supply_register(&pdev->dev, &pda_psy_ac);
Anton Vorontsovb2998042007-05-04 00:32:17 +0400287 if (ret) {
Dmitry Baryshkov9ef45102008-01-07 04:12:39 +0300288 dev_err(dev, "failed to register %s power supply\n",
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300289 pda_psy_ac.name);
Dmitry Baryshkov9ef45102008-01-07 04:12:39 +0300290 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,
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300296 &pda_psy_ac);
Dmitry Baryshkov9ef45102008-01-07 04:12:39 +0300297 if (ret) {
298 dev_err(dev, "request ac irq failed\n");
299 goto ac_irq_failed;
300 }
Anton Vorontsovc3caeba2008-01-13 02:44:20 +0300301 } else {
302 polling = 1;
Anton Vorontsovb2998042007-05-04 00:32:17 +0400303 }
304 }
305
Philipp Zabel5bf2b992009-01-18 17:40:27 +0100306#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
Dmitry Baryshkov9ef45102008-01-07 04:12:39 +0300313 if (pdata->is_usb_online) {
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300314 ret = power_supply_register(&pdev->dev, &pda_psy_usb);
Anton Vorontsovb2998042007-05-04 00:32:17 +0400315 if (ret) {
Dmitry Baryshkov9ef45102008-01-07 04:12:39 +0300316 dev_err(dev, "failed to register %s power supply\n",
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300317 pda_psy_usb.name);
Dmitry Baryshkov9ef45102008-01-07 04:12:39 +0300318 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),
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300324 usb_irq->name, &pda_psy_usb);
Dmitry Baryshkov9ef45102008-01-07 04:12:39 +0300325 if (ret) {
326 dev_err(dev, "request usb irq failed\n");
327 goto usb_irq_failed;
328 }
Anton Vorontsovc3caeba2008-01-13 02:44:20 +0300329 } else {
330 polling = 1;
Anton Vorontsovb2998042007-05-04 00:32:17 +0400331 }
332 }
333
Anton Vorontsovc3caeba2008-01-13 02:44:20 +0300334 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);
Dmitry Baryshkov8f8e9b32008-01-13 02:35:43 +0300343
Dmitry Baryshkov9ef45102008-01-07 04:12:39 +0300344 return 0;
Anton Vorontsovb2998042007-05-04 00:32:17 +0400345
346usb_irq_failed:
Dmitry Baryshkov9ef45102008-01-07 04:12:39 +0300347 if (pdata->is_usb_online)
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300348 power_supply_unregister(&pda_psy_usb);
Dmitry Baryshkov9ef45102008-01-07 04:12:39 +0300349usb_supply_failed:
350 if (pdata->is_ac_online && ac_irq)
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300351 free_irq(ac_irq->start, &pda_psy_ac);
Philipp Zabel5bf2b992009-01-18 17:40:27 +0100352#ifdef CONFIG_USB_OTG_UTILS
353 if (transceiver)
354 otg_put_transceiver(transceiver);
355#endif
Anton Vorontsovb2998042007-05-04 00:32:17 +0400356ac_irq_failed:
Dmitry Baryshkov9ef45102008-01-07 04:12:39 +0300357 if (pdata->is_ac_online)
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300358 power_supply_unregister(&pda_psy_ac);
Dmitry Baryshkov9ef45102008-01-07 04:12:39 +0300359ac_supply_failed:
Philipp Zabel5bf2b992009-01-18 17:40:27 +0100360 if (ac_draw) {
361 regulator_put(ac_draw);
362 ac_draw = NULL;
363 }
Philipp Zabelf6b6b182008-04-12 13:47:45 +0200364 if (pdata->exit)
365 pdata->exit(dev);
366init_failed:
Anton Vorontsovb2998042007-05-04 00:32:17 +0400367wrongid:
Anton Vorontsovb2998042007-05-04 00:32:17 +0400368 return ret;
369}
370
371static int pda_power_remove(struct platform_device *pdev)
372{
Dmitry Baryshkov9ef45102008-01-07 04:12:39 +0300373 if (pdata->is_usb_online && usb_irq)
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300374 free_irq(usb_irq->start, &pda_psy_usb);
Dmitry Baryshkov9ef45102008-01-07 04:12:39 +0300375 if (pdata->is_ac_online && ac_irq)
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300376 free_irq(ac_irq->start, &pda_psy_ac);
377
Anton Vorontsovc3caeba2008-01-13 02:44:20 +0300378 if (polling)
379 del_timer_sync(&polling_timer);
Anton Vorontsovb2998042007-05-04 00:32:17 +0400380 del_timer_sync(&charger_timer);
381 del_timer_sync(&supply_timer);
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300382
Dmitry Baryshkov9ef45102008-01-07 04:12:39 +0300383 if (pdata->is_usb_online)
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300384 power_supply_unregister(&pda_psy_usb);
Dmitry Baryshkov9ef45102008-01-07 04:12:39 +0300385 if (pdata->is_ac_online)
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300386 power_supply_unregister(&pda_psy_ac);
Philipp Zabel5bf2b992009-01-18 17:40:27 +0100387#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 }
Philipp Zabelf6b6b182008-04-12 13:47:45 +0200395 if (pdata->exit)
396 pdata->exit(dev);
Anton Vorontsovbfde2662008-01-13 02:39:17 +0300397
Anton Vorontsovb2998042007-05-04 00:32:17 +0400398 return 0;
399}
400
Dmitry Baryshkov8f8e9b32008-01-13 02:35:43 +0300401#ifdef CONFIG_PM
Robert Jarzmike82374f2008-08-11 22:22:27 +0200402static int ac_wakeup_enabled;
403static int usb_wakeup_enabled;
404
Dmitry Baryshkov8f8e9b32008-01-13 02:35:43 +0300405static int pda_power_suspend(struct platform_device *pdev, pm_message_t state)
406{
407 if (device_may_wakeup(&pdev->dev)) {
408 if (ac_irq)
Robert Jarzmike82374f2008-08-11 22:22:27 +0200409 ac_wakeup_enabled = !enable_irq_wake(ac_irq->start);
Dmitry Baryshkov8f8e9b32008-01-13 02:35:43 +0300410 if (usb_irq)
Robert Jarzmike82374f2008-08-11 22:22:27 +0200411 usb_wakeup_enabled = !enable_irq_wake(usb_irq->start);
Dmitry Baryshkov8f8e9b32008-01-13 02:35:43 +0300412 }
413
414 return 0;
415}
416
417static int pda_power_resume(struct platform_device *pdev)
418{
419 if (device_may_wakeup(&pdev->dev)) {
Robert Jarzmike82374f2008-08-11 22:22:27 +0200420 if (usb_irq && usb_wakeup_enabled)
Dmitry Baryshkov8f8e9b32008-01-13 02:35:43 +0300421 disable_irq_wake(usb_irq->start);
Robert Jarzmike82374f2008-08-11 22:22:27 +0200422 if (ac_irq && ac_wakeup_enabled)
Dmitry Baryshkov8f8e9b32008-01-13 02:35:43 +0300423 disable_irq_wake(ac_irq->start);
424 }
425
426 return 0;
427}
428#else
429#define pda_power_suspend NULL
430#define pda_power_resume NULL
431#endif /* CONFIG_PM */
432
Kay Sievers2f5a5cf2008-07-25 01:45:46 -0700433MODULE_ALIAS("platform:pda-power");
434
Anton Vorontsovb2998042007-05-04 00:32:17 +0400435static struct platform_driver pda_power_pdrv = {
436 .driver = {
437 .name = "pda-power",
438 },
439 .probe = pda_power_probe,
440 .remove = pda_power_remove,
Dmitry Baryshkov8f8e9b32008-01-13 02:35:43 +0300441 .suspend = pda_power_suspend,
442 .resume = pda_power_resume,
Anton Vorontsovb2998042007-05-04 00:32:17 +0400443};
444
445static int __init pda_power_init(void)
446{
447 return platform_driver_register(&pda_power_pdrv);
448}
449
450static void __exit pda_power_exit(void)
451{
452 platform_driver_unregister(&pda_power_pdrv);
Anton Vorontsovb2998042007-05-04 00:32:17 +0400453}
454
455module_init(pda_power_init);
456module_exit(pda_power_exit);
457MODULE_LICENSE("GPL");
458MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>");