--- /dev/null
+/*
+ * 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);
+ }
+
+ return;
+}
+
+static void supply_timer_func(unsigned long irq)
+{
+ if (ac_irq && irq == ac_irq->start)
+ power_supply_changed(&pda_power_supplies[0]);
+ else if (usb_irq && irq == usb_irq->start)
+ power_supply_changed(&pda_power_supplies[1]);
+ return;
+}
+
+static void charger_timer_func(unsigned long irq)
+{
+ update_charger();
+
+ /* Okay, charger set. Now wait a bit before notifying supplicants,
+ * charge power should stabilize. */
+ supply_timer.data = irq;
+ mod_timer(&supply_timer,
+ jiffies + msecs_to_jiffies(pdata->wait_for_charger));
+ return;
+}
+
+static irqreturn_t power_changed_isr(int irq, void *unused)
+{
+ /* Wait a bit before reading ac/usb line status and setting charger,
+ * because ac/usb status readings may lag from irq. */
+ charger_timer.data = irq;
+ 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);
+ return;
+}
+
+module_init(pda_power_init);
+module_exit(pda_power_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>");
projects / linux-2.6 / commitdiff