469 lines
10 KiB
C
469 lines
10 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/err.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/regulator/consumer.h>
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#include <linux/timer.h>
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#include <linux/jiffies.h>
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#include <linux/usb/otg.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_SAMPLE_RANDOM | 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 struct timer_list polling_timer;
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static int polling;
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#ifdef CONFIG_USB_OTG_UTILS
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static struct otg_transceiver *transceiver;
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#endif
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static struct regulator *ac_draw;
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enum {
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PDA_PSY_OFFLINE = 0,
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PDA_PSY_ONLINE = 1,
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PDA_PSY_TO_CHANGE,
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};
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static int new_ac_status = -1;
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static int new_usb_status = -1;
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static int ac_status = -1;
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static int usb_status = -1;
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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_psy_ac = {
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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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static struct power_supply pda_psy_usb = {
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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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static void update_status(void)
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{
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if (pdata->is_ac_online)
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new_ac_status = !!pdata->is_ac_online();
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if (pdata->is_usb_online)
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new_usb_status = !!pdata->is_usb_online();
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}
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static void update_charger(void)
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{
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static int regulator_enabled;
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int max_uA = pdata->ac_max_uA;
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if (pdata->set_charge) {
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if (new_ac_status > 0) {
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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 (new_usb_status > 0) {
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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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} else if (ac_draw) {
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if (new_ac_status > 0) {
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regulator_set_current_limit(ac_draw, max_uA, max_uA);
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if (!regulator_enabled) {
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dev_dbg(dev, "charger on (AC)\n");
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regulator_enable(ac_draw);
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regulator_enabled = 1;
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}
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} else {
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if (regulator_enabled) {
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dev_dbg(dev, "charger off\n");
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regulator_disable(ac_draw);
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regulator_enabled = 0;
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}
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}
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}
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}
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static void supply_timer_func(unsigned long unused)
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{
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if (ac_status == PDA_PSY_TO_CHANGE) {
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ac_status = new_ac_status;
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power_supply_changed(&pda_psy_ac);
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}
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if (usb_status == PDA_PSY_TO_CHANGE) {
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usb_status = new_usb_status;
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power_supply_changed(&pda_psy_usb);
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}
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}
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static void psy_changed(void)
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{
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update_charger();
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/*
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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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*/
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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 void charger_timer_func(unsigned long unused)
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{
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update_status();
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psy_changed();
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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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if (power_supply == &pda_psy_ac)
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ac_status = PDA_PSY_TO_CHANGE;
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else if (power_supply == &pda_psy_usb)
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usb_status = PDA_PSY_TO_CHANGE;
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else
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return IRQ_NONE;
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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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*/
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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 void polling_timer_func(unsigned long unused)
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{
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int changed = 0;
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dev_dbg(dev, "polling...\n");
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update_status();
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if (!ac_irq && new_ac_status != ac_status) {
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ac_status = PDA_PSY_TO_CHANGE;
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changed = 1;
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}
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if (!usb_irq && new_usb_status != usb_status) {
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usb_status = PDA_PSY_TO_CHANGE;
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changed = 1;
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}
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if (changed)
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psy_changed();
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mod_timer(&polling_timer,
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jiffies + msecs_to_jiffies(pdata->polling_interval));
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}
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#ifdef CONFIG_USB_OTG_UTILS
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static int otg_is_usb_online(void)
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{
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return (transceiver->state == OTG_STATE_B_PERIPHERAL);
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}
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#endif
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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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if (pdata->init) {
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ret = pdata->init(dev);
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if (ret < 0)
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goto init_failed;
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}
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update_status();
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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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if (!pdata->polling_interval)
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pdata->polling_interval = 2000;
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if (!pdata->ac_max_uA)
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pdata->ac_max_uA = 500000;
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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 (pdata->supplied_to) {
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pda_psy_ac.supplied_to = pdata->supplied_to;
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pda_psy_ac.num_supplicants = pdata->num_supplicants;
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pda_psy_usb.supplied_to = pdata->supplied_to;
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pda_psy_usb.num_supplicants = pdata->num_supplicants;
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}
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ac_draw = regulator_get(dev, "ac_draw");
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if (IS_ERR(ac_draw)) {
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dev_dbg(dev, "couldn't get ac_draw regulator\n");
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ac_draw = NULL;
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ret = PTR_ERR(ac_draw);
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}
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if (pdata->is_ac_online) {
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ret = power_supply_register(&pdev->dev, &pda_psy_ac);
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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_psy_ac.name);
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goto ac_supply_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_psy_ac);
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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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} else {
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polling = 1;
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}
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}
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#ifdef CONFIG_USB_OTG_UTILS
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transceiver = otg_get_transceiver();
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if (transceiver && !pdata->is_usb_online) {
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pdata->is_usb_online = otg_is_usb_online;
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}
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#endif
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if (pdata->is_usb_online) {
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ret = power_supply_register(&pdev->dev, &pda_psy_usb);
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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_psy_usb.name);
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goto usb_supply_failed;
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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),
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usb_irq->name, &pda_psy_usb);
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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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} else {
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polling = 1;
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}
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}
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if (polling) {
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dev_dbg(dev, "will poll for status\n");
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setup_timer(&polling_timer, polling_timer_func, 0);
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mod_timer(&polling_timer,
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jiffies + msecs_to_jiffies(pdata->polling_interval));
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}
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if (ac_irq || usb_irq)
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device_init_wakeup(&pdev->dev, 1);
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return 0;
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usb_irq_failed:
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if (pdata->is_usb_online)
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power_supply_unregister(&pda_psy_usb);
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usb_supply_failed:
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if (pdata->is_ac_online && ac_irq)
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free_irq(ac_irq->start, &pda_psy_ac);
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#ifdef CONFIG_USB_OTG_UTILS
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if (transceiver)
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otg_put_transceiver(transceiver);
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#endif
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ac_irq_failed:
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if (pdata->is_ac_online)
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power_supply_unregister(&pda_psy_ac);
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ac_supply_failed:
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if (ac_draw) {
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regulator_put(ac_draw);
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ac_draw = NULL;
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}
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if (pdata->exit)
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pdata->exit(dev);
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init_failed:
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wrongid:
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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 (pdata->is_usb_online && usb_irq)
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free_irq(usb_irq->start, &pda_psy_usb);
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if (pdata->is_ac_online && ac_irq)
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free_irq(ac_irq->start, &pda_psy_ac);
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if (polling)
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del_timer_sync(&polling_timer);
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del_timer_sync(&charger_timer);
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del_timer_sync(&supply_timer);
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if (pdata->is_usb_online)
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power_supply_unregister(&pda_psy_usb);
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if (pdata->is_ac_online)
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power_supply_unregister(&pda_psy_ac);
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#ifdef CONFIG_USB_OTG_UTILS
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if (transceiver)
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otg_put_transceiver(transceiver);
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#endif
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if (ac_draw) {
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regulator_put(ac_draw);
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ac_draw = NULL;
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}
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if (pdata->exit)
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pdata->exit(dev);
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return 0;
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}
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#ifdef CONFIG_PM
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static int ac_wakeup_enabled;
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static int usb_wakeup_enabled;
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static int pda_power_suspend(struct platform_device *pdev, pm_message_t state)
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{
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if (pdata->suspend) {
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int ret = pdata->suspend(state);
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if (ret)
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return ret;
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}
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if (device_may_wakeup(&pdev->dev)) {
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if (ac_irq)
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ac_wakeup_enabled = !enable_irq_wake(ac_irq->start);
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if (usb_irq)
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usb_wakeup_enabled = !enable_irq_wake(usb_irq->start);
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}
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return 0;
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}
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static int pda_power_resume(struct platform_device *pdev)
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{
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if (device_may_wakeup(&pdev->dev)) {
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if (usb_irq && usb_wakeup_enabled)
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disable_irq_wake(usb_irq->start);
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if (ac_irq && ac_wakeup_enabled)
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disable_irq_wake(ac_irq->start);
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}
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if (pdata->resume)
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return pdata->resume();
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return 0;
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}
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#else
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#define pda_power_suspend NULL
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#define pda_power_resume NULL
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#endif /* CONFIG_PM */
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MODULE_ALIAS("platform:pda-power");
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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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.suspend = pda_power_suspend,
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.resume = pda_power_resume,
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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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