| /* |
| * 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; |
| |
| #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->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_psy_ac = { |
| .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 struct power_supply pda_psy_usb = { |
| .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) { |
| ret = power_supply_register(&pdev->dev, &pda_psy_ac, &psy_cfg); |
| if (ret) { |
| dev_err(dev, "failed to register %s power supply\n", |
| pda_psy_ac.name); |
| 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) { |
| ret = power_supply_register(&pdev->dev, &pda_psy_usb, &psy_cfg); |
| if (ret) { |
| dev_err(dev, "failed to register %s power supply\n", |
| pda_psy_usb.name); |
| 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"); |