/* * 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 * * 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 #include #include #include #include #include #include static inline unsigned int get_irq_flags(struct resource *res) { unsigned int flags = IRQF_DISABLED | IRQF_SHARED; flags |= res->flags & IRQF_TRIGGER_MASK; return flags; } 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 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_power_supplies[] = { { .name = "ac", .type = POWER_SUPPLY_TYPE_MAINS, .supplied_to = pda_power_supplied_to, .num_supplicants = ARRAY_SIZE(pda_power_supplied_to), .properties = pda_power_props, .num_properties = ARRAY_SIZE(pda_power_props), .get_property = pda_power_get_property, }, { .name = "usb", .type = POWER_SUPPLY_TYPE_USB, .supplied_to = pda_power_supplied_to, .num_supplicants = ARRAY_SIZE(pda_power_supplied_to), .properties = pda_power_props, .num_properties = ARRAY_SIZE(pda_power_props), .get_property = pda_power_get_property, }, }; static void update_charger(void) { if (!pdata->set_charge) return; if (pdata->is_ac_online && pdata->is_ac_online()) { dev_dbg(dev, "charger on (AC)\n"); pdata->set_charge(PDA_POWER_CHARGE_AC); } else if (pdata->is_usb_online && pdata->is_usb_online()) { 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); } } static void supply_timer_func(unsigned long power_supply_ptr) { void *power_supply = (void *)power_supply_ptr; power_supply_changed(power_supply); } static void charger_timer_func(unsigned long power_supply_ptr) { update_charger(); /* Okay, charger set. Now wait a bit before notifying supplicants, * charge power should stabilize. */ supply_timer.data = power_supply_ptr; mod_timer(&supply_timer, jiffies + msecs_to_jiffies(pdata->wait_for_charger)); } static irqreturn_t power_changed_isr(int irq, void *power_supply) { /* Wait a bit before reading ac/usb line status and setting charger, * because ac/usb status readings may lag from irq. */ charger_timer.data = (unsigned long)power_supply; mod_timer(&charger_timer, jiffies + msecs_to_jiffies(pdata->wait_for_status)); return IRQ_HANDLED; } static int pda_power_probe(struct platform_device *pdev) { 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; update_charger(); if (!pdata->wait_for_status) pdata->wait_for_status = 500; if (!pdata->wait_for_charger) pdata->wait_for_charger = 500; 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 (!ac_irq && !usb_irq) { dev_err(dev, "no ac/usb irq specified\n"); ret = -ENODEV; goto noirqs; } if (pdata->supplied_to) { pda_power_supplies[0].supplied_to = pdata->supplied_to; pda_power_supplies[1].supplied_to = pdata->supplied_to; pda_power_supplies[0].num_supplicants = pdata->num_supplicants; pda_power_supplies[1].num_supplicants = pdata->num_supplicants; } ret = power_supply_register(&pdev->dev, &pda_power_supplies[0]); if (ret) { dev_err(dev, "failed to register %s power supply\n", pda_power_supplies[0].name); goto supply0_failed; } ret = power_supply_register(&pdev->dev, &pda_power_supplies[1]); if (ret) { dev_err(dev, "failed to register %s power supply\n", pda_power_supplies[1].name); goto supply1_failed; } if (ac_irq) { ret = request_irq(ac_irq->start, power_changed_isr, get_irq_flags(ac_irq), ac_irq->name, &pda_power_supplies[0]); if (ret) { dev_err(dev, "request ac irq failed\n"); goto ac_irq_failed; } } if (usb_irq) { ret = request_irq(usb_irq->start, power_changed_isr, get_irq_flags(usb_irq), usb_irq->name, &pda_power_supplies[1]); if (ret) { dev_err(dev, "request usb irq failed\n"); goto usb_irq_failed; } } goto success; usb_irq_failed: if (ac_irq) free_irq(ac_irq->start, &pda_power_supplies[0]); ac_irq_failed: power_supply_unregister(&pda_power_supplies[1]); supply1_failed: power_supply_unregister(&pda_power_supplies[0]); supply0_failed: noirqs: wrongid: success: return ret; } static int pda_power_remove(struct platform_device *pdev) { if (usb_irq) free_irq(usb_irq->start, &pda_power_supplies[1]); if (ac_irq) free_irq(ac_irq->start, &pda_power_supplies[0]); del_timer_sync(&charger_timer); del_timer_sync(&supply_timer); power_supply_unregister(&pda_power_supplies[1]); power_supply_unregister(&pda_power_supplies[0]); return 0; } static struct platform_driver pda_power_pdrv = { .driver = { .name = "pda-power", }, .probe = pda_power_probe, .remove = pda_power_remove, }; static int __init pda_power_init(void) { return platform_driver_register(&pda_power_pdrv); } static void __exit pda_power_exit(void) { platform_driver_unregister(&pda_power_pdrv); } module_init(pda_power_init); module_exit(pda_power_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Anton Vorontsov ");