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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>
23
24static inline unsigned int get_irq_flags(struct resource *res)
25{
26 unsigned int flags = IRQF_SAMPLE_RANDOM | IRQF_SHARED;
27
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;
38static struct timer_list polling_timer;
39static int polling;
40
41#ifdef CONFIG_USB_OTG_UTILS
42static struct otg_transceiver *transceiver;
43#endif
44static struct regulator *ac_draw;
45
46enum {
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
56static 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
84static 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,
92};
93
94static 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
113static void update_charger(void)
114{
115 static int regulator_enabled;
116 int max_uA = pdata->ac_max_uA;
117
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);
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 }
144 }
145}
146
147static void supply_timer_func(unsigned long unused)
148{
149 if (ac_status == PDA_PSY_TO_CHANGE) {
150 ac_status = new_ac_status;
151 power_supply_changed(&pda_psy_ac);
152 }
153
154 if (usb_status == PDA_PSY_TO_CHANGE) {
155 usb_status = new_usb_status;
156 power_supply_changed(&pda_psy_usb);
157 }
158}
159
160static void psy_changed(void)
161{
162 update_charger();
163
164
165
166
167
168 mod_timer(&supply_timer,
169 jiffies + msecs_to_jiffies(pdata->wait_for_charger));
170}
171
172static void charger_timer_func(unsigned long unused)
173{
174 update_status();
175 psy_changed();
176}
177
178static irqreturn_t power_changed_isr(int irq, void *power_supply)
179{
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;
186
187
188
189
190
191 mod_timer(&charger_timer,
192 jiffies + msecs_to_jiffies(pdata->wait_for_status));
193
194 return IRQ_HANDLED;
195}
196
197static 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
222#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
229static 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
244 if (pdata->init) {
245 ret = pdata->init(dev);
246 if (ret < 0)
247 goto init_failed;
248 }
249
250 update_status();
251 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
259 if (!pdata->polling_interval)
260 pdata->polling_interval = 2000;
261
262 if (!pdata->ac_max_uA)
263 pdata->ac_max_uA = 500000;
264
265 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");
270
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;
276 }
277
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);
283 }
284
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;
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,
296 &pda_psy_ac);
297 if (ret) {
298 dev_err(dev, "request ac irq failed\n");
299 goto ac_irq_failed;
300 }
301 } else {
302 polling = 1;
303 }
304 }
305
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;
310 }
311#endif
312
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;
319 }
320
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;
328 }
329 } else {
330 polling = 1;
331 }
332 }
333
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));
339 }
340
341 if (ac_irq || usb_irq)
342 device_init_wakeup(&pdev->dev, 1);
343
344 return 0;
345
346usb_irq_failed:
347 if (pdata->is_usb_online)
348 power_supply_unregister(&pda_psy_usb);
349usb_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
356ac_irq_failed:
357 if (pdata->is_ac_online)
358 power_supply_unregister(&pda_psy_ac);
359ac_supply_failed:
360 if (ac_draw) {
361 regulator_put(ac_draw);
362 ac_draw = NULL;
363 }
364 if (pdata->exit)
365 pdata->exit(dev);
366init_failed:
367wrongid:
368 return ret;
369}
370
371static int pda_power_remove(struct platform_device *pdev)
372{
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);
377
378 if (polling)
379 del_timer_sync(&polling_timer);
380 del_timer_sync(&charger_timer);
381 del_timer_sync(&supply_timer);
382
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;
394 }
395 if (pdata->exit)
396 pdata->exit(dev);
397
398 return 0;
399}
400
401#ifdef CONFIG_PM
402static int ac_wakeup_enabled;
403static int usb_wakeup_enabled;
404
405static int pda_power_suspend(struct platform_device *pdev, pm_message_t state)
406{
407 if (pdata->suspend) {
408 int ret = pdata->suspend(state);
409
410 if (ret)
411 return ret;
412 }
413
414 if (device_may_wakeup(&pdev->dev)) {
415 if (ac_irq)
416 ac_wakeup_enabled = !enable_irq_wake(ac_irq->start);
417 if (usb_irq)
418 usb_wakeup_enabled = !enable_irq_wake(usb_irq->start);
419 }
420
421 return 0;
422}
423
424static int pda_power_resume(struct platform_device *pdev)
425{
426 if (device_may_wakeup(&pdev->dev)) {
427 if (usb_irq && usb_wakeup_enabled)
428 disable_irq_wake(usb_irq->start);
429 if (ac_irq && ac_wakeup_enabled)
430 disable_irq_wake(ac_irq->start);
431 }
432
433 if (pdata->resume)
434 return pdata->resume();
435
436 return 0;
437}
438#else
439#define pda_power_suspend NULL
440#define pda_power_resume NULL
441#endif
442
443MODULE_ALIAS("platform:pda-power");
444
445static struct platform_driver pda_power_pdrv = {
446 .driver = {
447 .name = "pda-power",
448 },
449 .probe = pda_power_probe,
450 .remove = pda_power_remove,
451 .suspend = pda_power_suspend,
452 .resume = pda_power_resume,
453};
454
455static int __init pda_power_init(void)
456{
457 return platform_driver_register(&pda_power_pdrv);
458}
459
460static void __exit pda_power_exit(void)
461{
462 platform_driver_unregister(&pda_power_pdrv);
463}
464
465module_init(pda_power_init);
466module_exit(pda_power_exit);
467MODULE_LICENSE("GPL");
468MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>");
469
