/* * 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/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 timer_list charger_timer; static struct timer_list supply_timer; static struct timer_list polling_timer; 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_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)); } #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. */ mod_timer(&charger_timer, jiffies + 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; 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) { 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"); 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; #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 (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 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");