| /* |
| * 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/interrupt.h> |
| #include <linux/power_supply.h> |
| #include <linux/pda_power.h> |
| #include <linux/timer.h> |
| #include <linux/jiffies.h> |
| |
| 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 <cbou@mail.ru>"); |