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7b3d54a8c3
Per Jeff Garzik request. Signed-off-by: Jeff Garzik <jeff@garzik.org> Signed-off-by: Anton Vorontsov <cbou@mail.ru>
256 lines
6.3 KiB
C
256 lines
6.3 KiB
C
/*
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* Common power driver for PDAs and phones with one or two external
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* power supplies (AC/USB) connected to main and backup batteries,
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* and optional builtin charger.
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*
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* Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/power_supply.h>
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#include <linux/pda_power.h>
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#include <linux/timer.h>
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#include <linux/jiffies.h>
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static inline unsigned int get_irq_flags(struct resource *res)
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{
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unsigned int flags = IRQF_DISABLED | IRQF_SHARED;
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flags |= res->flags & IRQF_TRIGGER_MASK;
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return flags;
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}
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static struct device *dev;
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static struct pda_power_pdata *pdata;
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static struct resource *ac_irq, *usb_irq;
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static struct timer_list charger_timer;
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static struct timer_list supply_timer;
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static int pda_power_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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switch (psp) {
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case POWER_SUPPLY_PROP_ONLINE:
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if (psy->type == POWER_SUPPLY_TYPE_MAINS)
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val->intval = pdata->is_ac_online ?
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pdata->is_ac_online() : 0;
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else
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val->intval = pdata->is_usb_online ?
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pdata->is_usb_online() : 0;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static enum power_supply_property pda_power_props[] = {
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POWER_SUPPLY_PROP_ONLINE,
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};
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static char *pda_power_supplied_to[] = {
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"main-battery",
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"backup-battery",
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};
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static struct power_supply pda_power_supplies[] = {
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{
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.name = "ac",
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.type = POWER_SUPPLY_TYPE_MAINS,
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.supplied_to = pda_power_supplied_to,
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.num_supplicants = ARRAY_SIZE(pda_power_supplied_to),
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.properties = pda_power_props,
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.num_properties = ARRAY_SIZE(pda_power_props),
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.get_property = pda_power_get_property,
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},
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{
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.name = "usb",
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.type = POWER_SUPPLY_TYPE_USB,
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.supplied_to = pda_power_supplied_to,
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.num_supplicants = ARRAY_SIZE(pda_power_supplied_to),
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.properties = pda_power_props,
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.num_properties = ARRAY_SIZE(pda_power_props),
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.get_property = pda_power_get_property,
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},
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};
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static void update_charger(void)
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{
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if (!pdata->set_charge)
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return;
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if (pdata->is_ac_online && pdata->is_ac_online()) {
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dev_dbg(dev, "charger on (AC)\n");
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pdata->set_charge(PDA_POWER_CHARGE_AC);
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} else if (pdata->is_usb_online && pdata->is_usb_online()) {
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dev_dbg(dev, "charger on (USB)\n");
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pdata->set_charge(PDA_POWER_CHARGE_USB);
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} else {
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dev_dbg(dev, "charger off\n");
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pdata->set_charge(0);
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}
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}
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static void supply_timer_func(unsigned long power_supply_ptr)
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{
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void *power_supply = (void *)power_supply_ptr;
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power_supply_changed(power_supply);
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}
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static void charger_timer_func(unsigned long power_supply_ptr)
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{
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update_charger();
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/* Okay, charger set. Now wait a bit before notifying supplicants,
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* charge power should stabilize. */
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supply_timer.data = power_supply_ptr;
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mod_timer(&supply_timer,
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jiffies + msecs_to_jiffies(pdata->wait_for_charger));
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}
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static irqreturn_t power_changed_isr(int irq, void *power_supply)
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{
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/* Wait a bit before reading ac/usb line status and setting charger,
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* because ac/usb status readings may lag from irq. */
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charger_timer.data = (unsigned long)power_supply;
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mod_timer(&charger_timer,
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jiffies + msecs_to_jiffies(pdata->wait_for_status));
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return IRQ_HANDLED;
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}
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static int pda_power_probe(struct platform_device *pdev)
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{
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int ret = 0;
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dev = &pdev->dev;
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if (pdev->id != -1) {
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dev_err(dev, "it's meaningless to register several "
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"pda_powers; use id = -1\n");
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ret = -EINVAL;
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goto wrongid;
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}
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pdata = pdev->dev.platform_data;
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update_charger();
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if (!pdata->wait_for_status)
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pdata->wait_for_status = 500;
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if (!pdata->wait_for_charger)
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pdata->wait_for_charger = 500;
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setup_timer(&charger_timer, charger_timer_func, 0);
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setup_timer(&supply_timer, supply_timer_func, 0);
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ac_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "ac");
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usb_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "usb");
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if (!ac_irq && !usb_irq) {
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dev_err(dev, "no ac/usb irq specified\n");
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ret = -ENODEV;
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goto noirqs;
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}
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if (pdata->supplied_to) {
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pda_power_supplies[0].supplied_to = pdata->supplied_to;
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pda_power_supplies[1].supplied_to = pdata->supplied_to;
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pda_power_supplies[0].num_supplicants = pdata->num_supplicants;
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pda_power_supplies[1].num_supplicants = pdata->num_supplicants;
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}
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ret = power_supply_register(&pdev->dev, &pda_power_supplies[0]);
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if (ret) {
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dev_err(dev, "failed to register %s power supply\n",
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pda_power_supplies[0].name);
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goto supply0_failed;
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}
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ret = power_supply_register(&pdev->dev, &pda_power_supplies[1]);
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if (ret) {
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dev_err(dev, "failed to register %s power supply\n",
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pda_power_supplies[1].name);
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goto supply1_failed;
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}
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if (ac_irq) {
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ret = request_irq(ac_irq->start, power_changed_isr,
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get_irq_flags(ac_irq), ac_irq->name,
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&pda_power_supplies[0]);
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if (ret) {
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dev_err(dev, "request ac irq failed\n");
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goto ac_irq_failed;
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}
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}
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if (usb_irq) {
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ret = request_irq(usb_irq->start, power_changed_isr,
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get_irq_flags(usb_irq), usb_irq->name,
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&pda_power_supplies[1]);
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if (ret) {
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dev_err(dev, "request usb irq failed\n");
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goto usb_irq_failed;
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}
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}
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goto success;
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usb_irq_failed:
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if (ac_irq)
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free_irq(ac_irq->start, &pda_power_supplies[0]);
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ac_irq_failed:
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power_supply_unregister(&pda_power_supplies[1]);
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supply1_failed:
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power_supply_unregister(&pda_power_supplies[0]);
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supply0_failed:
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noirqs:
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wrongid:
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success:
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return ret;
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}
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static int pda_power_remove(struct platform_device *pdev)
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{
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if (usb_irq)
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free_irq(usb_irq->start, &pda_power_supplies[1]);
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if (ac_irq)
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free_irq(ac_irq->start, &pda_power_supplies[0]);
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del_timer_sync(&charger_timer);
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del_timer_sync(&supply_timer);
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power_supply_unregister(&pda_power_supplies[1]);
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power_supply_unregister(&pda_power_supplies[0]);
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return 0;
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}
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static struct platform_driver pda_power_pdrv = {
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.driver = {
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.name = "pda-power",
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},
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.probe = pda_power_probe,
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.remove = pda_power_remove,
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};
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static int __init pda_power_init(void)
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{
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return platform_driver_register(&pda_power_pdrv);
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}
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static void __exit pda_power_exit(void)
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{
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platform_driver_unregister(&pda_power_pdrv);
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}
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module_init(pda_power_init);
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module_exit(pda_power_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>");
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