1 // SPDX-License-Identifier: GPL-2.0-only
3 * Common power driver for PDAs and phones with one or two external
4 * power supplies (AC/USB) connected to main and backup batteries,
5 * and optional builtin charger.
7 * Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
10 #include <linux/module.h>
11 #include <linux/platform_device.h>
12 #include <linux/err.h>
13 #include <linux/interrupt.h>
14 #include <linux/notifier.h>
15 #include <linux/power_supply.h>
16 #include <linux/pda_power.h>
17 #include <linux/regulator/consumer.h>
18 #include <linux/timer.h>
19 #include <linux/jiffies.h>
20 #include <linux/usb/otg.h>
22 static inline unsigned int get_irq_flags(struct resource *res)
24 return IRQF_SHARED | (res->flags & IRQF_TRIGGER_MASK);
27 static struct device *dev;
28 static struct pda_power_pdata *pdata;
29 static struct resource *ac_irq, *usb_irq;
30 static struct delayed_work charger_work;
31 static struct delayed_work polling_work;
32 static struct delayed_work supply_work;
34 static struct power_supply *pda_psy_ac, *pda_psy_usb;
36 #if IS_ENABLED(CONFIG_USB_PHY)
37 static struct usb_phy *transceiver;
38 static struct notifier_block otg_nb;
41 static struct regulator *ac_draw;
48 static int new_ac_status = -1;
49 static int new_usb_status = -1;
50 static int ac_status = -1;
51 static int usb_status = -1;
53 static int pda_power_get_property(struct power_supply *psy,
54 enum power_supply_property psp,
55 union power_supply_propval *val)
58 case POWER_SUPPLY_PROP_ONLINE:
59 if (psy->desc->type == POWER_SUPPLY_TYPE_MAINS)
60 val->intval = pdata->is_ac_online ?
61 pdata->is_ac_online() : 0;
63 val->intval = pdata->is_usb_online ?
64 pdata->is_usb_online() : 0;
72 static enum power_supply_property pda_power_props[] = {
73 POWER_SUPPLY_PROP_ONLINE,
76 static char *pda_power_supplied_to[] = {
81 static const struct power_supply_desc pda_psy_ac_desc = {
83 .type = POWER_SUPPLY_TYPE_MAINS,
84 .properties = pda_power_props,
85 .num_properties = ARRAY_SIZE(pda_power_props),
86 .get_property = pda_power_get_property,
89 static const struct power_supply_desc pda_psy_usb_desc = {
91 .type = POWER_SUPPLY_TYPE_USB,
92 .properties = pda_power_props,
93 .num_properties = ARRAY_SIZE(pda_power_props),
94 .get_property = pda_power_get_property,
97 static void update_status(void)
99 if (pdata->is_ac_online)
100 new_ac_status = !!pdata->is_ac_online();
102 if (pdata->is_usb_online)
103 new_usb_status = !!pdata->is_usb_online();
106 static void update_charger(void)
108 static int regulator_enabled;
109 int max_uA = pdata->ac_max_uA;
111 if (pdata->set_charge) {
112 if (new_ac_status > 0) {
113 dev_dbg(dev, "charger on (AC)\n");
114 pdata->set_charge(PDA_POWER_CHARGE_AC);
115 } else if (new_usb_status > 0) {
116 dev_dbg(dev, "charger on (USB)\n");
117 pdata->set_charge(PDA_POWER_CHARGE_USB);
119 dev_dbg(dev, "charger off\n");
120 pdata->set_charge(0);
122 } else if (ac_draw) {
123 if (new_ac_status > 0) {
124 regulator_set_current_limit(ac_draw, max_uA, max_uA);
125 if (!regulator_enabled) {
126 dev_dbg(dev, "charger on (AC)\n");
127 WARN_ON(regulator_enable(ac_draw));
128 regulator_enabled = 1;
131 if (regulator_enabled) {
132 dev_dbg(dev, "charger off\n");
133 WARN_ON(regulator_disable(ac_draw));
134 regulator_enabled = 0;
140 static void supply_work_func(struct work_struct *work)
142 if (ac_status == PDA_PSY_TO_CHANGE) {
143 ac_status = new_ac_status;
144 power_supply_changed(pda_psy_ac);
147 if (usb_status == PDA_PSY_TO_CHANGE) {
148 usb_status = new_usb_status;
149 power_supply_changed(pda_psy_usb);
153 static void psy_changed(void)
158 * Okay, charger set. Now wait a bit before notifying supplicants,
159 * charge power should stabilize.
161 cancel_delayed_work(&supply_work);
162 schedule_delayed_work(&supply_work,
163 msecs_to_jiffies(pdata->wait_for_charger));
166 static void charger_work_func(struct work_struct *work)
172 static irqreturn_t power_changed_isr(int irq, void *power_supply)
174 if (power_supply == pda_psy_ac)
175 ac_status = PDA_PSY_TO_CHANGE;
176 else if (power_supply == pda_psy_usb)
177 usb_status = PDA_PSY_TO_CHANGE;
182 * Wait a bit before reading ac/usb line status and setting charger,
183 * because ac/usb status readings may lag from irq.
185 cancel_delayed_work(&charger_work);
186 schedule_delayed_work(&charger_work,
187 msecs_to_jiffies(pdata->wait_for_status));
192 static void polling_work_func(struct work_struct *work)
196 dev_dbg(dev, "polling...\n");
200 if (!ac_irq && new_ac_status != ac_status) {
201 ac_status = PDA_PSY_TO_CHANGE;
205 if (!usb_irq && new_usb_status != usb_status) {
206 usb_status = PDA_PSY_TO_CHANGE;
213 cancel_delayed_work(&polling_work);
214 schedule_delayed_work(&polling_work,
215 msecs_to_jiffies(pdata->polling_interval));
218 #if IS_ENABLED(CONFIG_USB_PHY)
219 static int otg_is_usb_online(void)
221 return (transceiver->last_event == USB_EVENT_VBUS ||
222 transceiver->last_event == USB_EVENT_ENUMERATED);
225 static int otg_is_ac_online(void)
227 return (transceiver->last_event == USB_EVENT_CHARGER);
230 static int otg_handle_notification(struct notifier_block *nb,
231 unsigned long event, void *unused)
234 case USB_EVENT_CHARGER:
235 ac_status = PDA_PSY_TO_CHANGE;
238 case USB_EVENT_ENUMERATED:
239 usb_status = PDA_PSY_TO_CHANGE;
242 ac_status = PDA_PSY_TO_CHANGE;
243 usb_status = PDA_PSY_TO_CHANGE;
250 * Wait a bit before reading ac/usb line status and setting charger,
251 * because ac/usb status readings may lag from irq.
253 cancel_delayed_work(&charger_work);
254 schedule_delayed_work(&charger_work,
255 msecs_to_jiffies(pdata->wait_for_status));
261 static int pda_power_probe(struct platform_device *pdev)
263 struct power_supply_config psy_cfg = {};
268 if (pdev->id != -1) {
269 dev_err(dev, "it's meaningless to register several "
270 "pda_powers; use id = -1\n");
275 pdata = pdev->dev.platform_data;
278 ret = pdata->init(dev);
283 ac_draw = regulator_get(dev, "ac_draw");
284 if (IS_ERR(ac_draw)) {
285 dev_dbg(dev, "couldn't get ac_draw regulator\n");
292 if (!pdata->wait_for_status)
293 pdata->wait_for_status = 500;
295 if (!pdata->wait_for_charger)
296 pdata->wait_for_charger = 500;
298 if (!pdata->polling_interval)
299 pdata->polling_interval = 2000;
301 if (!pdata->ac_max_uA)
302 pdata->ac_max_uA = 500000;
304 INIT_DELAYED_WORK(&charger_work, charger_work_func);
305 INIT_DELAYED_WORK(&supply_work, supply_work_func);
307 ac_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "ac");
308 usb_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "usb");
310 if (pdata->supplied_to) {
311 psy_cfg.supplied_to = pdata->supplied_to;
312 psy_cfg.num_supplicants = pdata->num_supplicants;
314 psy_cfg.supplied_to = pda_power_supplied_to;
315 psy_cfg.num_supplicants = ARRAY_SIZE(pda_power_supplied_to);
318 #if IS_ENABLED(CONFIG_USB_PHY)
319 transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
320 if (!IS_ERR_OR_NULL(transceiver)) {
321 if (!pdata->is_usb_online)
322 pdata->is_usb_online = otg_is_usb_online;
323 if (!pdata->is_ac_online)
324 pdata->is_ac_online = otg_is_ac_online;
328 if (pdata->is_ac_online) {
329 pda_psy_ac = power_supply_register(&pdev->dev,
330 &pda_psy_ac_desc, &psy_cfg);
331 if (IS_ERR(pda_psy_ac)) {
332 dev_err(dev, "failed to register %s power supply\n",
333 pda_psy_ac_desc.name);
334 ret = PTR_ERR(pda_psy_ac);
335 goto ac_supply_failed;
339 ret = request_irq(ac_irq->start, power_changed_isr,
340 get_irq_flags(ac_irq), ac_irq->name,
343 dev_err(dev, "request ac irq failed\n");
351 if (pdata->is_usb_online) {
352 pda_psy_usb = power_supply_register(&pdev->dev,
355 if (IS_ERR(pda_psy_usb)) {
356 dev_err(dev, "failed to register %s power supply\n",
357 pda_psy_usb_desc.name);
358 ret = PTR_ERR(pda_psy_usb);
359 goto usb_supply_failed;
363 ret = request_irq(usb_irq->start, power_changed_isr,
364 get_irq_flags(usb_irq),
365 usb_irq->name, pda_psy_usb);
367 dev_err(dev, "request usb irq failed\n");
375 #if IS_ENABLED(CONFIG_USB_PHY)
376 if (!IS_ERR_OR_NULL(transceiver) && pdata->use_otg_notifier) {
377 otg_nb.notifier_call = otg_handle_notification;
378 ret = usb_register_notifier(transceiver, &otg_nb);
380 dev_err(dev, "failure to register otg notifier\n");
381 goto otg_reg_notifier_failed;
388 dev_dbg(dev, "will poll for status\n");
389 INIT_DELAYED_WORK(&polling_work, polling_work_func);
390 cancel_delayed_work(&polling_work);
391 schedule_delayed_work(&polling_work,
392 msecs_to_jiffies(pdata->polling_interval));
395 if (ac_irq || usb_irq)
396 device_init_wakeup(&pdev->dev, 1);
400 #if IS_ENABLED(CONFIG_USB_PHY)
401 otg_reg_notifier_failed:
402 if (pdata->is_usb_online && usb_irq)
403 free_irq(usb_irq->start, pda_psy_usb);
406 if (pdata->is_usb_online)
407 power_supply_unregister(pda_psy_usb);
409 if (pdata->is_ac_online && ac_irq)
410 free_irq(ac_irq->start, pda_psy_ac);
411 #if IS_ENABLED(CONFIG_USB_PHY)
412 if (!IS_ERR_OR_NULL(transceiver))
413 usb_put_phy(transceiver);
416 if (pdata->is_ac_online)
417 power_supply_unregister(pda_psy_ac);
420 regulator_put(ac_draw);
430 static int pda_power_remove(struct platform_device *pdev)
432 #if IS_ENABLED(CONFIG_USB_PHY)
433 if (!IS_ERR_OR_NULL(transceiver) && pdata->use_otg_notifier)
434 usb_unregister_notifier(transceiver, &otg_nb);
436 if (pdata->is_usb_online && usb_irq)
437 free_irq(usb_irq->start, pda_psy_usb);
438 if (pdata->is_ac_online && ac_irq)
439 free_irq(ac_irq->start, pda_psy_ac);
442 cancel_delayed_work_sync(&polling_work);
443 cancel_delayed_work_sync(&charger_work);
444 cancel_delayed_work_sync(&supply_work);
446 if (pdata->is_usb_online)
447 power_supply_unregister(pda_psy_usb);
448 if (pdata->is_ac_online)
449 power_supply_unregister(pda_psy_ac);
450 #if IS_ENABLED(CONFIG_USB_PHY)
451 if (!IS_ERR_OR_NULL(transceiver))
452 usb_put_phy(transceiver);
455 regulator_put(ac_draw);
465 static int ac_wakeup_enabled;
466 static int usb_wakeup_enabled;
468 static int pda_power_suspend(struct platform_device *pdev, pm_message_t state)
470 if (pdata->suspend) {
471 int ret = pdata->suspend(state);
477 if (device_may_wakeup(&pdev->dev)) {
479 ac_wakeup_enabled = !enable_irq_wake(ac_irq->start);
481 usb_wakeup_enabled = !enable_irq_wake(usb_irq->start);
487 static int pda_power_resume(struct platform_device *pdev)
489 if (device_may_wakeup(&pdev->dev)) {
490 if (usb_irq && usb_wakeup_enabled)
491 disable_irq_wake(usb_irq->start);
492 if (ac_irq && ac_wakeup_enabled)
493 disable_irq_wake(ac_irq->start);
497 return pdata->resume();
502 #define pda_power_suspend NULL
503 #define pda_power_resume NULL
504 #endif /* CONFIG_PM */
506 static struct platform_driver pda_power_pdrv = {
510 .probe = pda_power_probe,
511 .remove = pda_power_remove,
512 .suspend = pda_power_suspend,
513 .resume = pda_power_resume,
516 module_platform_driver(pda_power_pdrv);
518 MODULE_LICENSE("GPL");
519 MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>");
520 MODULE_ALIAS("platform:pda-power");