4 files changed, 301 insertions, 0 deletions

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 7811fa627412..cc70644db947 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -14,4 +14,11 @@ config POWER_SUPPLY_DEBUG
           Say Y here to enable debugging messages for power supply class
           and drivers.
 
+config PDA_POWER
+        tristate "Generic PDA/phone power driver"
+        help
+          Say Y here to enable generic 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.
+
 endif # POWER_SUPPLY
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index 3c88148983a2..1ff4b6806381 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -13,3 +13,5 @@ EXTRA_CFLAGS += -DDEBUG
 endif
 
 obj-$(CONFIG_POWER_SUPPLY)      += power_supply.o
+
+obj-$(CONFIG_PDA_POWER)         += pda_power.o
diff --git a/drivers/power/pda_power.c b/drivers/power/pda_power.c
new file mode 100644
index 000000000000..4e1eb040e148
--- /dev/null
+++ b/drivers/power/pda_power.c
@@ -0,0 +1,261 @@
+/*
+ * 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>");
diff --git a/include/linux/pda_power.h b/include/linux/pda_power.h
new file mode 100644
index 000000000000..1375f15797e7
--- /dev/null
+++ b/include/linux/pda_power.h
@@ -0,0 +1,31 @@
+/*
+ * 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.
+ */
+
+#ifndef __PDA_POWER_H__
+#define __PDA_POWER_H__
+
+#define PDA_POWER_CHARGE_AC  (1 << 0)
+#define PDA_POWER_CHARGE_USB (1 << 1)
+
+struct pda_power_pdata {
+        int (*is_ac_online)(void);
+        int (*is_usb_online)(void);
+        void (*set_charge)(int flags);
+
+        char **supplied_to;
+        size_t num_supplicants;
+
+        unsigned int wait_for_status; /* msecs, default is 500 */
+        unsigned int wait_for_charger; /* msecs, default is 500 */
+};
+
+#endif /* __PDA_POWER_H__ */