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[cor_2_6_31.git] / drivers / power / pda_power.c
bloba232de6a57037599f23dd8e99b2a2857f5c443a9
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.
6 * Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
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.
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>
24 static inline unsigned int get_irq_flags(struct resource *res)
26 unsigned int flags = IRQF_SAMPLE_RANDOM | IRQF_SHARED;
28 flags |= res->flags & IRQF_TRIGGER_MASK;
30 return flags;
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;
41 #ifdef CONFIG_USB_OTG_UTILS
42 static struct otg_transceiver *transceiver;
43 #endif
44 static struct regulator *ac_draw;
46 enum {
47 PDA_PSY_OFFLINE = 0,
48 PDA_PSY_ONLINE = 1,
49 PDA_PSY_TO_CHANGE,
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;
56 static int pda_power_get_property(struct power_supply *psy,
57 enum power_supply_property psp,
58 union power_supply_propval *val)
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;
72 return 0;
75 static enum power_supply_property pda_power_props[] = {
76 POWER_SUPPLY_PROP_ONLINE,
79 static char *pda_power_supplied_to[] = {
80 "main-battery",
81 "backup-battery",
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,
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,
104 static void update_status(void)
106 if (pdata->is_ac_online)
107 new_ac_status = !!pdata->is_ac_online();
109 if (pdata->is_usb_online)
110 new_usb_status = !!pdata->is_usb_online();
113 static void update_charger(void)
115 static int regulator_enabled;
116 int max_uA = pdata->ac_max_uA;
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);
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;
137 } else {
138 if (regulator_enabled) {
139 dev_dbg(dev, "charger off\n");
140 regulator_disable(ac_draw);
141 regulator_enabled = 0;
147 static void supply_timer_func(unsigned long unused)
149 if (ac_status == PDA_PSY_TO_CHANGE) {
150 ac_status = new_ac_status;
151 power_supply_changed(&pda_psy_ac);
154 if (usb_status == PDA_PSY_TO_CHANGE) {
155 usb_status = new_usb_status;
156 power_supply_changed(&pda_psy_usb);
160 static void psy_changed(void)
162 update_charger();
165 * Okay, charger set. Now wait a bit before notifying supplicants,
166 * charge power should stabilize.
168 mod_timer(&supply_timer,
169 jiffies + msecs_to_jiffies(pdata->wait_for_charger));
172 static void charger_timer_func(unsigned long unused)
174 update_status();
175 psy_changed();
178 static irqreturn_t power_changed_isr(int irq, void *power_supply)
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;
188 * Wait a bit before reading ac/usb line status and setting charger,
189 * because ac/usb status readings may lag from irq.
191 mod_timer(&charger_timer,
192 jiffies + msecs_to_jiffies(pdata->wait_for_status));
194 return IRQ_HANDLED;
197 static void polling_timer_func(unsigned long unused)
199 int changed = 0;
201 dev_dbg(dev, "polling...\n");
203 update_status();
205 if (!ac_irq && new_ac_status != ac_status) {
206 ac_status = PDA_PSY_TO_CHANGE;
207 changed = 1;
210 if (!usb_irq && new_usb_status != usb_status) {
211 usb_status = PDA_PSY_TO_CHANGE;
212 changed = 1;
215 if (changed)
216 psy_changed();
218 mod_timer(&polling_timer,
219 jiffies + msecs_to_jiffies(pdata->polling_interval));
222 #ifdef CONFIG_USB_OTG_UTILS
223 static int otg_is_usb_online(void)
225 return (transceiver->state == OTG_STATE_B_PERIPHERAL);
227 #endif
229 static int pda_power_probe(struct platform_device *pdev)
231 int ret = 0;
233 dev = &pdev->dev;
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;
242 pdata = pdev->dev.platform_data;
244 if (pdata->init) {
245 ret = pdata->init(dev);
246 if (ret < 0)
247 goto init_failed;
250 update_status();
251 update_charger();
253 if (!pdata->wait_for_status)
254 pdata->wait_for_status = 500;
256 if (!pdata->wait_for_charger)
257 pdata->wait_for_charger = 500;
259 if (!pdata->polling_interval)
260 pdata->polling_interval = 2000;
262 if (!pdata->ac_max_uA)
263 pdata->ac_max_uA = 500000;
265 setup_timer(&charger_timer, charger_timer_func, 0);
266 setup_timer(&supply_timer, supply_timer_func, 0);
268 ac_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "ac");
269 usb_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "usb");
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;
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);
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;
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;
301 } else {
302 polling = 1;
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;
311 #endif
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;
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;
329 } else {
330 polling = 1;
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));
341 if (ac_irq || usb_irq)
342 device_init_wakeup(&pdev->dev, 1);
344 return 0;
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;
364 if (pdata->exit)
365 pdata->exit(dev);
366 init_failed:
367 wrongid:
368 return ret;
371 static int pda_power_remove(struct platform_device *pdev)
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);
378 if (polling)
379 del_timer_sync(&polling_timer);
380 del_timer_sync(&charger_timer);
381 del_timer_sync(&supply_timer);
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;
395 if (pdata->exit)
396 pdata->exit(dev);
398 return 0;
401 #ifdef CONFIG_PM
402 static int ac_wakeup_enabled;
403 static int usb_wakeup_enabled;
405 static int pda_power_suspend(struct platform_device *pdev, pm_message_t state)
407 if (device_may_wakeup(&pdev->dev)) {
408 if (ac_irq)
409 ac_wakeup_enabled = !enable_irq_wake(ac_irq->start);
410 if (usb_irq)
411 usb_wakeup_enabled = !enable_irq_wake(usb_irq->start);
414 return 0;
417 static int pda_power_resume(struct platform_device *pdev)
419 if (device_may_wakeup(&pdev->dev)) {
420 if (usb_irq && usb_wakeup_enabled)
421 disable_irq_wake(usb_irq->start);
422 if (ac_irq && ac_wakeup_enabled)
423 disable_irq_wake(ac_irq->start);
426 return 0;
428 #else
429 #define pda_power_suspend NULL
430 #define pda_power_resume NULL
431 #endif /* CONFIG_PM */
433 MODULE_ALIAS("platform:pda-power");
435 static struct platform_driver pda_power_pdrv = {
436 .driver = {
437 .name = "pda-power",
439 .probe = pda_power_probe,
440 .remove = pda_power_remove,
441 .suspend = pda_power_suspend,
442 .resume = pda_power_resume,
445 static int __init pda_power_init(void)
447 return platform_driver_register(&pda_power_pdrv);
450 static void __exit pda_power_exit(void)
452 platform_driver_unregister(&pda_power_pdrv);
455 module_init(pda_power_init);
456 module_exit(pda_power_exit);
457 MODULE_LICENSE("GPL");
458 MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>");