/*
* Common power driver for PDAs and phones with one or two external
* power supplies (AC/USB) connected to main and backup batteries,
* and optional builtin charger.
*
* Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/notifier.h>
#include <linux/power_supply.h>
#include <linux/pda_power.h>
#include <linux/regulator/consumer.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
#include <linux/usb/otg.h>
static inline unsigned int get_irq_flags(struct resource *res)
{
return IRQF_SHARED | (res->flags & IRQF_TRIGGER_MASK);
}
static struct device *dev;
static struct pda_power_pdata *pdata;
static struct resource *ac_irq, *usb_irq;
static struct timer_list charger_timer;
static struct timer_list supply_timer;
static struct timer_list polling_timer;
static int polling;
static struct power_supply *pda_psy_ac, *pda_psy_usb;
#if IS_ENABLED(CONFIG_USB_PHY)
static struct usb_phy *transceiver;
static struct notifier_block otg_nb;
#endif
static struct regulator *ac_draw;
enum {
PDA_PSY_OFFLINE = 0,
PDA_PSY_ONLINE = 1,
PDA_PSY_TO_CHANGE,
};
static int new_ac_status = -1;
static int new_usb_status = -1;
static int ac_status = -1;
static int usb_status = -1;
static int pda_power_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
if (psy->desc->type == POWER_SUPPLY_TYPE_MAINS)
val->intval = pdata->is_ac_online ?
pdata->is_ac_online() : 0;
else
val->intval = pdata->is_usb_online ?
pdata->is_usb_online() : 0;
break;
default:
return -EINVAL;
}
return 0;
}
static enum power_supply_property pda_power_props[] = {
POWER_SUPPLY_PROP_ONLINE,
};
static char *pda_power_supplied_to[] = {
"main-battery",
"backup-battery",
};
static const struct power_supply_desc pda_psy_ac_desc = {
.name = "ac",
.type = POWER_SUPPLY_TYPE_MAINS,
.properties = pda_power_props,
.num_properties = ARRAY_SIZE(pda_power_props),
.get_property = pda_power_get_property,
};
static const struct power_supply_desc pda_psy_usb_desc = {
.name = "usb",
.type = POWER_SUPPLY_TYPE_USB,
.properties = pda_power_props,
.num_properties = ARRAY_SIZE(pda_power_props),
.get_property = pda_power_get_property,
};
static void update_status(void)
{
if (pdata->is_ac_online)
new_ac_status = !!pdata->is_ac_online();
if (pdata->is_usb_online)
new_usb_status = !!pdata->is_usb_online();
}
static void update_charger(void)
{
static int regulator_enabled;
int max_uA = pdata->ac_max_uA;
if (pdata->set_charge) {
if (new_ac_status > 0) {
dev_dbg(dev, "charger on (AC)\n");
pdata->set_charge(PDA_POWER_CHARGE_AC);
} else if (new_usb_status > 0) {
dev_dbg(dev, "charger on (USB)\n");
pdata->set_charge(PDA_POWER_CHARGE_USB);
} else {
dev_dbg(dev, "charger off\n");
pdata->set_charge(0);
}
} else if (ac_draw) {
if (new_ac_status > 0) {
regulator_set_current_limit(ac_draw, max_uA, max_uA);
if (!regulator_enabled) {
dev_dbg(dev, "charger on (AC)\n");
WARN_ON(regulator_enable(ac_draw));
regulator_enabled = 1;
}
} else {
if (regulator_enabled) {
dev_dbg(dev, "charger off\n");
WARN_ON(regulator_disable(ac_draw));
regulator_enabled = 0;
}
}
}
}
static void supply_timer_func(unsigned long unused)
{
if (ac_status == PDA_PSY_TO_CHANGE) {
ac_status = new_ac_status;
power_supply_changed(pda_psy_ac);
}
if (usb_status == PDA_PSY_TO_CHANGE) {
usb_status = new_usb_status;
power_supply_changed(pda_psy_usb);
}
}
static void psy_changed(void)
{
update_charger();
/*
* Okay, charger set. Now wait a bit before notifying supplicants,
* charge power should stabilize.
*/
mod_timer(&supply_timer,
jiffies + msecs_to_jiffies(pdata->wait_for_charger));
}
static void charger_timer_func(unsigned long unused)
{
update_status();
psy_changed();
}
static irqreturn_t power_changed_isr(int irq, void *power_supply)
{
if (power_supply == pda_psy_ac)
ac_status = PDA_PSY_TO_CHANGE;
else if (power_supply == pda_psy_usb)
usb_status = PDA_PSY_TO_CHANGE;
else
return IRQ_NONE;
/*
* Wait a bit before reading ac/usb line status and setting charger,
* because ac/usb status readings may lag from irq.
*/
mod_timer(&charger_timer,
jiffies + msecs_to_jiffies(pdata->wait_for_status));
return IRQ_HANDLED;
}
static void polling_timer_func(unsigned long unused)
{
int changed = 0;
dev_dbg(dev, "polling...\n");
update_status();
if (!ac_irq && new_ac_status != ac_status) {
ac_status = PDA_PSY_TO_CHANGE;
changed = 1;
}
if (!usb_irq && new_usb_status != usb_status) {
usb_status = PDA_PSY_TO_CHANGE;
changed = 1;
}
if (changed)
psy_changed();
mod_timer(&polling_timer,
jiffies + msecs_to_jiffies(pdata->polling_interval));
}
#if IS_ENABLED(CONFIG_USB_PHY)
static int otg_is_usb_online(void)
{
return (transceiver->last_event == USB_EVENT_VBUS ||
transceiver->last_event == USB_EVENT_ENUMERATED);
}
static int otg_is_ac_online(void)
{
return (transceiver->last_event == USB_EVENT_CHARGER);
}
static int otg_handle_notification(struct notifier_block *nb,
unsigned long event, void *unused)
{
switch (event) {
case USB_EVENT_CHARGER:
ac_status = PDA_PSY_TO_CHANGE;
break;
case USB_EVENT_VBUS:
case USB_EVENT_ENUMERATED:
usb_status = PDA_PSY_TO_CHANGE;
break;
case USB_EVENT_NONE:
ac_status = PDA_PSY_TO_CHANGE;
usb_status = PDA_PSY_TO_CHANGE;
break;
default:
return NOTIFY_OK;
}
/*
* Wait a bit before reading ac/usb line status and setting charger,
* because ac/usb status readings may lag from irq.
*/
mod_timer(&charger_timer,
jiffies + msecs_to_jiffies(pdata->wait_for_status));
return NOTIFY_OK;
}
#endif
static int pda_power_probe(struct platform_device *pdev)
{
struct power_supply_config psy_cfg = {};
int ret = 0;
dev = &pdev->dev;
if (pdev->id != -1) {
dev_err(dev, "it's meaningless to register several "
"pda_powers; use id = -1\n");
ret = -EINVAL;
goto wrongid;
}
pdata = pdev->dev.platform_data;
if (pdata->init) {
ret = pdata->init(dev);
if (ret < 0)
goto init_failed;
}
ac_draw = regulator_get(dev, "ac_draw");
if (IS_ERR(ac_draw)) {
dev_dbg(dev, "couldn't get ac_draw regulator\n");
ac_draw = NULL;
}
update_status();
update_charger();
if (!pdata->wait_for_status)
pdata->wait_for_status = 500;
if (!pdata->wait_for_charger)
pdata->wait_for_charger = 500;
if (!pdata->polling_interval)
pdata->polling_interval = 2000;
if (!pdata->ac_max_uA)
pdata->ac_max_uA = 500000;
setup_timer(&charger_timer, charger_timer_func, 0);
setup_timer(&supply_timer, supply_timer_func, 0);
ac_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "ac");
usb_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "usb");
if (pdata->supplied_to) {
psy_cfg.supplied_to = pdata->supplied_to;
psy_cfg.num_supplicants = pdata->num_supplicants;
} else {
psy_cfg.supplied_to = pda_power_supplied_to;
psy_cfg.num_supplicants = ARRAY_SIZE(pda_power_supplied_to);
}
#if IS_ENABLED(CONFIG_USB_PHY)
transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
if (!IS_ERR_OR_NULL(transceiver)) {
if (!pdata->is_usb_online)
pdata->is_usb_online = otg_is_usb_online;
if (!pdata->is_ac_online)
pdata->is_ac_online = otg_is_ac_online;
}
#endif
if (pdata->is_ac_online) {
pda_psy_ac = power_supply_register(&pdev->dev,
&pda_psy_ac_desc, &psy_cfg);
if (IS_ERR(pda_psy_ac)) {
dev_err(dev, "failed to register %s power supply\n",
pda_psy_ac_desc.name);
ret = PTR_ERR(pda_psy_ac);
goto ac_supply_failed;
}
if (ac_irq) {
ret = request_irq(ac_irq->start, power_changed_isr,
get_irq_flags(ac_irq), ac_irq->name,
pda_psy_ac);
if (ret) {
dev_err(dev, "request ac irq failed\n");
goto ac_irq_failed;
}
} else {
polling = 1;
}
}
if (pdata->is_usb_online) {
pda_psy_usb = power_supply_register(&pdev->dev,
&pda_psy_usb_desc,
&psy_cfg);
if (IS_ERR(pda_psy_usb)) {
dev_err(dev, "failed to register %s power supply\n",
pda_psy_usb_desc.name);
ret = PTR_ERR(pda_psy_usb);
goto usb_supply_failed;
}
if (usb_irq) {
ret = request_irq(usb_irq->start, power_changed_isr,
get_irq_flags(usb_irq),
usb_irq->name, pda_psy_usb);
if (ret) {
dev_err(dev, "request usb irq failed\n");
goto usb_irq_failed;
}
} else {
polling = 1;
}
}
#if IS_ENABLED(CONFIG_USB_PHY)
if (!IS_ERR_OR_NULL(transceiver) && pdata->use_otg_notifier) {
otg_nb.notifier_call = otg_handle_notification;
ret = usb_register_notifier(transceiver, &otg_nb);
if (ret) {
dev_err(dev, "failure to register otg notifier\n");
goto otg_reg_notifier_failed;
}
polling = 0;
}
#endif
if (polling) {
dev_dbg(dev, "will poll for status\n");
setup_timer(&polling_timer, polling_timer_func, 0);
mod_timer(&polling_timer,
jiffies + msecs_to_jiffies(pdata->polling_interval));
}
if (ac_irq || usb_irq)
device_init_wakeup(&pdev->dev, 1);
return 0;
#if IS_ENABLED(CONFIG_USB_PHY)
otg_reg_notifier_failed:
if (pdata->is_usb_online && usb_irq)
free_irq(usb_irq->start, pda_psy_usb);
#endif
usb_irq_failed:
if (pdata->is_usb_online)
power_supply_unregister(pda_psy_usb);
usb_supply_failed:
if (pdata->is_ac_online && ac_irq)
free_irq(ac_irq->start, pda_psy_ac);
#if IS_ENABLED(CONFIG_USB_PHY)
if (!IS_ERR_OR_NULL(transceiver))
usb_put_phy(transceiver);
#endif
ac_irq_failed:
if (pdata->is_ac_online)
power_supply_unregister(pda_psy_ac);
ac_supply_failed:
if (ac_draw) {
regulator_put(ac_draw);
ac_draw = NULL;
}
if (pdata->exit)
pdata->exit(dev);
init_failed:
wrongid:
return ret;
}
static int pda_power_remove(struct platform_device *pdev)
{
if (pdata->is_usb_online && usb_irq)
free_irq(usb_irq->start, pda_psy_usb);
if (pdata->is_ac_online && ac_irq)
free_irq(ac_irq->start, pda_psy_ac);
if (polling)
del_timer_sync(&polling_timer);
del_timer_sync(&charger_timer);
del_timer_sync(&supply_timer);
if (pdata->is_usb_online)
power_supply_unregister(pda_psy_usb);
if (pdata->is_ac_online)
power_supply_unregister(pda_psy_ac);
#if IS_ENABLED(CONFIG_USB_PHY)
if (!IS_ERR_OR_NULL(transceiver))
usb_put_phy(transceiver);
#endif
if (ac_draw) {
regulator_put(ac_draw);
ac_draw = NULL;
}
if (pdata->exit)
pdata->exit(dev);
return 0;
}
#ifdef CONFIG_PM
static int ac_wakeup_enabled;
static int usb_wakeup_enabled;
static int pda_power_suspend(struct platform_device *pdev, pm_message_t state)
{
if (pdata->suspend) {
int ret = pdata->suspend(state);
if (ret)
return ret;
}
if (device_may_wakeup(&pdev->dev)) {
if (ac_irq)
ac_wakeup_enabled = !enable_irq_wake(ac_irq->start);
if (usb_irq)
usb_wakeup_enabled = !enable_irq_wake(usb_irq->start);
}
return 0;
}
static int pda_power_resume(struct platform_device *pdev)
{
if (device_may_wakeup(&pdev->dev)) {
if (usb_irq && usb_wakeup_enabled)
disable_irq_wake(usb_irq->start);
if (ac_irq && ac_wakeup_enabled)
disable_irq_wake(ac_irq->start);
}
if (pdata->resume)
return pdata->resume();
return 0;
}
#else
#define pda_power_suspend NULL
#define pda_power_resume NULL
#endif /* CONFIG_PM */
static struct platform_driver pda_power_pdrv = {
.driver = {
.name = "pda-power",
},
.probe = pda_power_probe,
.remove = pda_power_remove,
.suspend = pda_power_suspend,
.resume = pda_power_resume,
};
module_platform_driver(pda_power_pdrv);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>");
MODULE_ALIAS("platform:pda-power");
