+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * 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>
- */
-
-#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 delayed_work charger_work;
-static struct delayed_work polling_work;
-static struct delayed_work supply_work;
-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_work_func(struct work_struct *work)
-{
- 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.
- */
- cancel_delayed_work(&supply_work);
- schedule_delayed_work(&supply_work,
- msecs_to_jiffies(pdata->wait_for_charger));
-}
-
-static void charger_work_func(struct work_struct *work)
-{
- 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.
- */
- cancel_delayed_work(&charger_work);
- schedule_delayed_work(&charger_work,
- msecs_to_jiffies(pdata->wait_for_status));
-
- return IRQ_HANDLED;
-}
-
-static void polling_work_func(struct work_struct *work)
-{
- 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();
-
- cancel_delayed_work(&polling_work);
- schedule_delayed_work(&polling_work,
- 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.
- */
- cancel_delayed_work(&charger_work);
- schedule_delayed_work(&charger_work,
- 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;
-
- INIT_DELAYED_WORK(&charger_work, charger_work_func);
- INIT_DELAYED_WORK(&supply_work, supply_work_func);
-
- 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");
- INIT_DELAYED_WORK(&polling_work, polling_work_func);
- cancel_delayed_work(&polling_work);
- schedule_delayed_work(&polling_work,
- 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 IS_ENABLED(CONFIG_USB_PHY)
- if (!IS_ERR_OR_NULL(transceiver) && pdata->use_otg_notifier)
- usb_unregister_notifier(transceiver, &otg_nb);
-#endif
- 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)
- cancel_delayed_work_sync(&polling_work);
- cancel_delayed_work_sync(&charger_work);
- cancel_delayed_work_sync(&supply_work);
-
- 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");
projects / platform / kernel / linux-rpi.git / commitdiff