/*
* 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 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_power_supplies[] = {
{
.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,
},
{
.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_charger(void)
{
if (!pdata->set_charge)
return;
if (pdata->is_ac_online && pdata->is_ac_online()) {
dev_dbg(dev, "charger on (AC)\n");
pdata->set_charge(PDA_POWER_CHARGE_AC);
} else if (pdata->is_usb_online && pdata->is_usb_online()) {
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);
}
return;
}
static void supply_timer_func(unsigned long irq)
{
if (ac_irq && irq == ac_irq->start)
power_supply_changed(&pda_power_supplies[0]);
else if (usb_irq && irq == usb_irq->start)
power_supply_changed(&pda_power_supplies[1]);
return;
}
static void charger_timer_func(unsigned long irq)
{
update_charger();
/* Okay, charger set. Now wait a bit before notifying supplicants,
* charge power should stabilize. */
supply_timer.data = irq;
mod_timer(&supply_timer,
jiffies + msecs_to_jiffies(pdata->wait_for_charger));
return;
}
static irqreturn_t power_changed_isr(int irq, void *unused)
{
/* Wait a bit before reading ac/usb line status and setting charger,
* because ac/usb status readings may lag from irq. */
charger_timer.data = irq;
mod_timer(&charger_timer,
jiffies + msecs_to_jiffies(pdata->wait_for_status));
return IRQ_HANDLED;
}
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;
update_charger();
if (!pdata->wait_for_status)
pdata->wait_for_status = 500;
if (!pdata->wait_for_charger)
pdata->wait_for_charger = 500;
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 (!ac_irq && !usb_irq) {
dev_err(dev, "no ac/usb irq specified\n");
ret = -ENODEV;
goto noirqs;
}
if (pdata->supplied_to) {
pda_power_supplies[0].supplied_to = pdata->supplied_to;
pda_power_supplies[1].supplied_to = pdata->supplied_to;
pda_power_supplies[0].num_supplicants = pdata->num_supplicants;
pda_power_supplies[1].num_supplicants = pdata->num_supplicants;
}
ret = power_supply_register(&pdev->dev, &pda_power_supplies[0]);
if (ret) {
dev_err(dev, "failed to register %s power supply\n",
pda_power_supplies[0].name);
goto supply0_failed;
}
ret = power_supply_register(&pdev->dev, &pda_power_supplies[1]);
if (ret) {
dev_err(dev, "failed to register %s power supply\n",
pda_power_supplies[1].name);
goto supply1_failed;
}
if (ac_irq) {
ret = request_irq(ac_irq->start, power_changed_isr,
get_irq_flags(ac_irq), ac_irq->name,
&pda_power_supplies[0]);
if (ret) {
dev_err(dev, "request ac irq failed\n");
goto ac_irq_failed;
}
}
if (usb_irq) {
ret = request_irq(usb_irq->start, power_changed_isr,
get_irq_flags(usb_irq), usb_irq->name,
&pda_power_supplies[1]);
if (ret) {
dev_err(dev, "request usb irq failed\n");
goto usb_irq_failed;
}
}
goto success;
usb_irq_failed:
if (ac_irq)
free_irq(ac_irq->start, &pda_power_supplies[0]);
ac_irq_failed:
power_supply_unregister(&pda_power_supplies[1]);
supply1_failed:
power_supply_unregister(&pda_power_supplies[0]);
supply0_failed:
noirqs:
wrongid:
success:
return ret;
}
static int pda_power_remove(struct platform_device *pdev)
{
if (usb_irq)
free_irq(usb_irq->start, &pda_power_supplies[1]);
if (ac_irq)
free_irq(ac_irq->start, &pda_power_supplies[0]);
del_timer_sync(&charger_timer);
del_timer_sync(&supply_timer);
power_supply_unregister(&pda_power_supplies[1]);
power_supply_unregister(&pda_power_supplies[0]);
return 0;
}
static struct platform_driver pda_power_pdrv = {
.driver = {
.name = "pda-power",
},
.probe = pda_power_probe,
.remove = pda_power_remove,
};
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);
return;
}
module_init(pda_power_init);
module_exit(pda_power_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>");
