tosa_battery.c

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/*
 * Battery and Power Management code for the Sharp SL-6000x
 *
 * Copyright (c) 2005 Dirk Opfer
 * Copyright (c) 2008 Dmitry Baryshkov
 *
 * 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/kernel.h>
#include <linux/module.h>
#include <linux/power_supply.h>
#include <linux/wm97xx.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>

#include <asm/mach-types.h>
#include <mach/tosa.h>

static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
static struct work_struct bat_work;

struct tosa_bat {
    int status;
    struct power_supply psy;
    int full_chrg;

    struct mutex work_lock; /* protects data */

    bool (*is_present)(struct tosa_bat *bat);
    int gpio_full;
    int gpio_charge_off;

    int technology;

    int gpio_bat;
    int adc_bat;
    int adc_bat_divider;
    int bat_max;
    int bat_min;

    int gpio_temp;
    int adc_temp;
    int adc_temp_divider;
};

static struct tosa_bat tosa_bat_main;
static struct tosa_bat tosa_bat_jacket;

static unsigned long tosa_read_bat(struct tosa_bat *bat)
{
    unsigned long value = 0;

    if (bat->gpio_bat < 0 || bat->adc_bat < 0)
        return 0;

    mutex_lock(&bat_lock);
    gpio_set_value(bat->gpio_bat, 1);
    msleep(5);
    value = wm97xx_read_aux_adc(dev_get_drvdata(bat->psy.dev->parent),
            bat->adc_bat);
    gpio_set_value(bat->gpio_bat, 0);
    mutex_unlock(&bat_lock);

    value = value * 1000000 / bat->adc_bat_divider;

    return value;
}

static unsigned long tosa_read_temp(struct tosa_bat *bat)
{
    unsigned long value = 0;

    if (bat->gpio_temp < 0 || bat->adc_temp < 0)
        return 0;

    mutex_lock(&bat_lock);
    gpio_set_value(bat->gpio_temp, 1);
    msleep(5);
    value = wm97xx_read_aux_adc(dev_get_drvdata(bat->psy.dev->parent),
            bat->adc_temp);
    gpio_set_value(bat->gpio_temp, 0);
    mutex_unlock(&bat_lock);

    value = value * 10000 / bat->adc_temp_divider;

    return value;
}

static int tosa_bat_get_property(struct power_supply *psy,
                enum power_supply_property psp,
                union power_supply_propval *val)
{
    int ret = 0;
    struct tosa_bat *bat = container_of(psy, struct tosa_bat, psy);

    if (bat->is_present && !bat->is_present(bat)
            && psp != POWER_SUPPLY_PROP_PRESENT) {
        return -ENODEV;
    }

    switch (psp) {
    case POWER_SUPPLY_PROP_STATUS:
        val->intval = bat->status;
        break;
    case POWER_SUPPLY_PROP_TECHNOLOGY:
        val->intval = bat->technology;
        break;
    case POWER_SUPPLY_PROP_VOLTAGE_NOW:
        val->intval = tosa_read_bat(bat);
        break;
    case POWER_SUPPLY_PROP_VOLTAGE_MAX:
        if (bat->full_chrg == -1)
            val->intval = bat->bat_max;
        else
            val->intval = bat->full_chrg;
        break;
    case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
        val->intval = bat->bat_max;
        break;
    case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
        val->intval = bat->bat_min;
        break;
    case POWER_SUPPLY_PROP_TEMP:
        val->intval = tosa_read_temp(bat);
        break;
    case POWER_SUPPLY_PROP_PRESENT:
        val->intval = bat->is_present ? bat->is_present(bat) : 1;
        break;
    default:
        ret = -EINVAL;
        break;
    }
    return ret;
}

static bool tosa_jacket_bat_is_present(struct tosa_bat *bat)
{
    return gpio_get_value(TOSA_GPIO_JACKET_DETECT) == 0;
}

static void tosa_bat_external_power_changed(struct power_supply *psy)
{
    schedule_work(&bat_work);
}

static irqreturn_t tosa_bat_gpio_isr(int irq, void *data)
{
    pr_info("tosa_bat_gpio irq: %d\n", gpio_get_value(irq_to_gpio(irq)));
    schedule_work(&bat_work);
    return IRQ_HANDLED;
}

static void tosa_bat_update(struct tosa_bat *bat)
{
    int old;
    struct power_supply *psy = &bat->psy;

    mutex_lock(&bat->work_lock);

    old = bat->status;

    if (bat->is_present && !bat->is_present(bat)) {
        printk(KERN_NOTICE "%s not present\n", psy->name);
        bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
        bat->full_chrg = -1;
    } else if (power_supply_am_i_supplied(psy)) {
        if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) {
            gpio_set_value(bat->gpio_charge_off, 0);
            mdelay(15);
        }

        if (gpio_get_value(bat->gpio_full)) {
            if (old == POWER_SUPPLY_STATUS_CHARGING ||
                    bat->full_chrg == -1)
                bat->full_chrg = tosa_read_bat(bat);

            gpio_set_value(bat->gpio_charge_off, 1);
            bat->status = POWER_SUPPLY_STATUS_FULL;
        } else {
            gpio_set_value(bat->gpio_charge_off, 0);
            bat->status = POWER_SUPPLY_STATUS_CHARGING;
        }
    } else {
        gpio_set_value(bat->gpio_charge_off, 1);
        bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
    }

    if (old != bat->status)
        power_supply_changed(psy);

    mutex_unlock(&bat->work_lock);
}

static void tosa_bat_work(struct work_struct *work)
{
    tosa_bat_update(&tosa_bat_main);
    tosa_bat_update(&tosa_bat_jacket);
}


static enum power_supply_property tosa_bat_main_props[] = {
    POWER_SUPPLY_PROP_STATUS,
    POWER_SUPPLY_PROP_TECHNOLOGY,
    POWER_SUPPLY_PROP_VOLTAGE_NOW,
    POWER_SUPPLY_PROP_VOLTAGE_MAX,
    POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
    POWER_SUPPLY_PROP_TEMP,
    POWER_SUPPLY_PROP_PRESENT,
};

static enum power_supply_property tosa_bat_bu_props[] = {
    POWER_SUPPLY_PROP_STATUS,
    POWER_SUPPLY_PROP_TECHNOLOGY,
    POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
    POWER_SUPPLY_PROP_VOLTAGE_NOW,
    POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
    POWER_SUPPLY_PROP_PRESENT,
};

static struct tosa_bat tosa_bat_main = {
    .status = POWER_SUPPLY_STATUS_DISCHARGING,
    .full_chrg = -1,
    .psy = {
        .name       = "main-battery",
        .type       = POWER_SUPPLY_TYPE_BATTERY,
        .properties = tosa_bat_main_props,
        .num_properties = ARRAY_SIZE(tosa_bat_main_props),
        .get_property   = tosa_bat_get_property,
        .external_power_changed = tosa_bat_external_power_changed,
        .use_for_apm    = 1,
    },

    .gpio_full = TOSA_GPIO_BAT0_CRG,
    .gpio_charge_off = TOSA_GPIO_CHARGE_OFF,

    .technology = POWER_SUPPLY_TECHNOLOGY_LIPO,

    .gpio_bat = TOSA_GPIO_BAT0_V_ON,
    .adc_bat = WM97XX_AUX_ID3,
    .adc_bat_divider = 414,
    .bat_max = 4310000,
    .bat_min = 1551 * 1000000 / 414,

    .gpio_temp = TOSA_GPIO_BAT1_TH_ON,
    .adc_temp = WM97XX_AUX_ID2,
    .adc_temp_divider = 10000,
};

static struct tosa_bat tosa_bat_jacket = {
    .status = POWER_SUPPLY_STATUS_DISCHARGING,
    .full_chrg = -1,
    .psy = {
        .name       = "jacket-battery",
        .type       = POWER_SUPPLY_TYPE_BATTERY,
        .properties = tosa_bat_main_props,
        .num_properties = ARRAY_SIZE(tosa_bat_main_props),
        .get_property   = tosa_bat_get_property,
        .external_power_changed = tosa_bat_external_power_changed,
    },

    .is_present = tosa_jacket_bat_is_present,
    .gpio_full = TOSA_GPIO_BAT1_CRG,
    .gpio_charge_off = TOSA_GPIO_CHARGE_OFF_JC,

    .technology = POWER_SUPPLY_TECHNOLOGY_LIPO,

    .gpio_bat = TOSA_GPIO_BAT1_V_ON,
    .adc_bat = WM97XX_AUX_ID3,
    .adc_bat_divider = 414,
    .bat_max = 4310000,
    .bat_min = 1551 * 1000000 / 414,

    .gpio_temp = TOSA_GPIO_BAT0_TH_ON,
    .adc_temp = WM97XX_AUX_ID2,
    .adc_temp_divider = 10000,
};

static struct tosa_bat tosa_bat_bu = {
    .status = POWER_SUPPLY_STATUS_UNKNOWN,
    .full_chrg = -1,

    .psy = {
        .name       = "backup-battery",
        .type       = POWER_SUPPLY_TYPE_BATTERY,
        .properties = tosa_bat_bu_props,
        .num_properties = ARRAY_SIZE(tosa_bat_bu_props),
        .get_property   = tosa_bat_get_property,
        .external_power_changed = tosa_bat_external_power_changed,
    },

    .gpio_full = -1,
    .gpio_charge_off = -1,

    .technology = POWER_SUPPLY_TECHNOLOGY_LiMn,

    .gpio_bat = TOSA_GPIO_BU_CHRG_ON,
    .adc_bat = WM97XX_AUX_ID4,
    .adc_bat_divider = 1266,

    .gpio_temp = -1,
    .adc_temp = -1,
    .adc_temp_divider = -1,
};

static struct gpio tosa_bat_gpios[] = {
    { TOSA_GPIO_CHARGE_OFF,    GPIOF_OUT_INIT_HIGH, "main charge off" },
    { TOSA_GPIO_CHARGE_OFF_JC, GPIOF_OUT_INIT_HIGH, "jacket charge off" },
    { TOSA_GPIO_BAT_SW_ON,     GPIOF_OUT_INIT_LOW,  "battery switch" },
    { TOSA_GPIO_BAT0_V_ON,     GPIOF_OUT_INIT_LOW,  "main battery" },
    { TOSA_GPIO_BAT1_V_ON,     GPIOF_OUT_INIT_LOW,  "jacket battery" },
    { TOSA_GPIO_BAT1_TH_ON,    GPIOF_OUT_INIT_LOW,  "main battery temp" },
    { TOSA_GPIO_BAT0_TH_ON,    GPIOF_OUT_INIT_LOW,  "jacket battery temp" },
    { TOSA_GPIO_BU_CHRG_ON,    GPIOF_OUT_INIT_LOW,  "backup battery" },
    { TOSA_GPIO_BAT0_CRG,      GPIOF_IN,        "main battery full" },
    { TOSA_GPIO_BAT1_CRG,      GPIOF_IN,        "jacket battery full" },
    { TOSA_GPIO_BAT0_LOW,      GPIOF_IN,        "main battery low" },
    { TOSA_GPIO_BAT1_LOW,      GPIOF_IN,        "jacket battery low" },
    { TOSA_GPIO_JACKET_DETECT, GPIOF_IN,        "jacket detect" },
};

#ifdef CONFIG_PM
static int tosa_bat_suspend(struct platform_device *dev, pm_message_t state)
{
    /* flush all pending status updates */
    flush_work(&bat_work);
    return 0;
}

static int tosa_bat_resume(struct platform_device *dev)
{
    /* things may have changed while we were away */
    schedule_work(&bat_work);
    return 0;
}
#else
#define tosa_bat_suspend NULL
#define tosa_bat_resume NULL
#endif

static int __devinit tosa_bat_probe(struct platform_device *dev)
{
    int ret;

    if (!machine_is_tosa())
        return -ENODEV;

    ret = gpio_request_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
    if (ret)
        return ret;

    mutex_init(&tosa_bat_main.work_lock);
    mutex_init(&tosa_bat_jacket.work_lock);

    INIT_WORK(&bat_work, tosa_bat_work);

    ret = power_supply_register(&dev->dev, &tosa_bat_main.psy);
    if (ret)
        goto err_psy_reg_main;
    ret = power_supply_register(&dev->dev, &tosa_bat_jacket.psy);
    if (ret)
        goto err_psy_reg_jacket;
    ret = power_supply_register(&dev->dev, &tosa_bat_bu.psy);
    if (ret)
        goto err_psy_reg_bu;

    ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG),
                tosa_bat_gpio_isr,
                IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
                "main full", &tosa_bat_main);
    if (ret)
        goto err_req_main;

    ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG),
                tosa_bat_gpio_isr,
                IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
                "jacket full", &tosa_bat_jacket);
    if (ret)
        goto err_req_jacket;

    ret = request_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT),
                tosa_bat_gpio_isr,
                IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
                "jacket detect", &tosa_bat_jacket);
    if (!ret) {
        schedule_work(&bat_work);
        return 0;
    }

    free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
err_req_jacket:
    free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);
err_req_main:
    power_supply_unregister(&tosa_bat_bu.psy);
err_psy_reg_bu:
    power_supply_unregister(&tosa_bat_jacket.psy);
err_psy_reg_jacket:
    power_supply_unregister(&tosa_bat_main.psy);
err_psy_reg_main:

    /* see comment in tosa_bat_remove */
    cancel_work_sync(&bat_work);

    gpio_free_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
    return ret;
}

static int __devexit tosa_bat_remove(struct platform_device *dev)
{
    free_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT), &tosa_bat_jacket);
    free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
    free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);

    power_supply_unregister(&tosa_bat_bu.psy);
    power_supply_unregister(&tosa_bat_jacket.psy);
    power_supply_unregister(&tosa_bat_main.psy);

    /*
     * Now cancel the bat_work.  We won't get any more schedules,
     * since all sources (isr and external_power_changed) are
     * unregistered now.
     */
    cancel_work_sync(&bat_work);
    gpio_free_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
    return 0;
}

static struct platform_driver tosa_bat_driver = {
    .driver.name    = "wm97xx-battery",
    .driver.owner   = THIS_MODULE,
    .probe      = tosa_bat_probe,
    .remove     = __devexit_p(tosa_bat_remove),
    .suspend    = tosa_bat_suspend,
    .resume     = tosa_bat_resume,
};

module_platform_driver(tosa_bat_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Dmitry Baryshkov");
MODULE_DESCRIPTION("Tosa battery driver");
MODULE_ALIAS("platform:wm97xx-battery");