394 lines
8.8 KiB
C
394 lines
8.8 KiB
C
/*
|
|
* 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/interrupt.h>
|
|
#include <linux/power_supply.h>
|
|
#include <linux/pda_power.h>
|
|
#include <linux/timer.h>
|
|
#include <linux/jiffies.h>
|
|
|
|
static inline unsigned int get_irq_flags(struct resource *res)
|
|
{
|
|
unsigned int flags = IRQF_DISABLED | IRQF_SHARED;
|
|
|
|
flags |= res->flags & IRQF_TRIGGER_MASK;
|
|
|
|
return flags;
|
|
}
|
|
|
|
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;
|
|
|
|
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->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 struct power_supply pda_psy_ac = {
|
|
.name = "ac",
|
|
.type = POWER_SUPPLY_TYPE_MAINS,
|
|
.supplied_to = pda_power_supplied_to,
|
|
.num_supplicants = ARRAY_SIZE(pda_power_supplied_to),
|
|
.properties = pda_power_props,
|
|
.num_properties = ARRAY_SIZE(pda_power_props),
|
|
.get_property = pda_power_get_property,
|
|
};
|
|
|
|
static struct power_supply pda_psy_usb = {
|
|
.name = "usb",
|
|
.type = POWER_SUPPLY_TYPE_USB,
|
|
.supplied_to = pda_power_supplied_to,
|
|
.num_supplicants = ARRAY_SIZE(pda_power_supplied_to),
|
|
.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)
|
|
{
|
|
if (!pdata->set_charge)
|
|
return;
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
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));
|
|
}
|
|
|
|
static int pda_power_probe(struct platform_device *pdev)
|
|
{
|
|
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;
|
|
}
|
|
|
|
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;
|
|
|
|
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) {
|
|
pda_psy_ac.supplied_to = pdata->supplied_to;
|
|
pda_psy_ac.num_supplicants = pdata->num_supplicants;
|
|
pda_psy_usb.supplied_to = pdata->supplied_to;
|
|
pda_psy_usb.num_supplicants = pdata->num_supplicants;
|
|
}
|
|
|
|
if (pdata->is_ac_online) {
|
|
ret = power_supply_register(&pdev->dev, &pda_psy_ac);
|
|
if (ret) {
|
|
dev_err(dev, "failed to register %s power supply\n",
|
|
pda_psy_ac.name);
|
|
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) {
|
|
ret = power_supply_register(&pdev->dev, &pda_psy_usb);
|
|
if (ret) {
|
|
dev_err(dev, "failed to register %s power supply\n",
|
|
pda_psy_usb.name);
|
|
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 (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;
|
|
|
|
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);
|
|
ac_irq_failed:
|
|
if (pdata->is_ac_online)
|
|
power_supply_unregister(&pda_psy_ac);
|
|
ac_supply_failed:
|
|
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 (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 (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);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
#define pda_power_suspend NULL
|
|
#define pda_power_resume NULL
|
|
#endif /* CONFIG_PM */
|
|
|
|
MODULE_ALIAS("platform:pda-power");
|
|
|
|
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,
|
|
};
|
|
|
|
static int __init pda_power_init(void)
|
|
{
|
|
return platform_driver_register(&pda_power_pdrv);
|
|
}
|
|
|
|
static void __exit pda_power_exit(void)
|
|
{
|
|
platform_driver_unregister(&pda_power_pdrv);
|
|
}
|
|
|
|
module_init(pda_power_init);
|
|
module_exit(pda_power_exit);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>");
|