corgi_pm.c

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/*
 * Battery and Power Management code for the Sharp SL-C7xx
 *
 * Copyright (c) 2005 Richard Purdie
 *
 * 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/stat.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/gpio-pxa.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/apm-emulation.h>
#include <linux/io.h>

#include <asm/irq.h>
#include <asm/mach-types.h>
#include <mach/hardware.h>

#include <mach/corgi.h>
#include <mach/pxa2xx-regs.h>
#include <mach/sharpsl_pm.h>

#include "generic.h"

#define SHARPSL_CHARGE_ON_VOLT         0x99  /* 2.9V */
#define SHARPSL_CHARGE_ON_TEMP         0xe0  /* 2.9V */
#define SHARPSL_CHARGE_ON_ACIN_HIGH    0x9b  /* 6V */
#define SHARPSL_CHARGE_ON_ACIN_LOW     0x34  /* 2V */
#define SHARPSL_FATAL_ACIN_VOLT        182   /* 3.45V */
#define SHARPSL_FATAL_NOACIN_VOLT      170   /* 3.40V */

static struct gpio charger_gpios[] = {
    { CORGI_GPIO_ADC_TEMP_ON, GPIOF_OUT_INIT_LOW, "ADC Temp On" },
    { CORGI_GPIO_CHRG_ON,     GPIOF_OUT_INIT_LOW, "Charger On" },
    { CORGI_GPIO_CHRG_UKN,    GPIOF_OUT_INIT_LOW, "Charger Unknown" },
    { CORGI_GPIO_AC_IN,   GPIOF_IN, "Charger Detection" },
    { CORGI_GPIO_KEY_INT,     GPIOF_IN, "Key Interrupt" },
    { CORGI_GPIO_WAKEUP,      GPIOF_IN, "System wakeup notification" },
};

static void corgi_charger_init(void)
{
    gpio_request_array(ARRAY_AND_SIZE(charger_gpios));
}

static void corgi_measure_temp(int on)
{
    gpio_set_value(CORGI_GPIO_ADC_TEMP_ON, on);
}

static void corgi_charge(int on)
{
    if (on) {
        if (machine_is_corgi() && (sharpsl_pm.flags & SHARPSL_SUSPENDED)) {
            gpio_set_value(CORGI_GPIO_CHRG_ON, 0);
            gpio_set_value(CORGI_GPIO_CHRG_UKN, 1);
        } else {
            gpio_set_value(CORGI_GPIO_CHRG_ON, 1);
            gpio_set_value(CORGI_GPIO_CHRG_UKN, 0);
        }
    } else {
        gpio_set_value(CORGI_GPIO_CHRG_ON, 0);
        gpio_set_value(CORGI_GPIO_CHRG_UKN, 0);
    }
}

static void corgi_discharge(int on)
{
    gpio_set_value(CORGI_GPIO_DISCHARGE_ON, on);
}

static void corgi_presuspend(void)
{
}

static void corgi_postsuspend(void)
{
}

/*
 * Check what brought us out of the suspend.
 * Return: 0 to sleep, otherwise wake
 */
static int corgi_should_wakeup(unsigned int resume_on_alarm)
{
    int is_resume = 0;

    dev_dbg(sharpsl_pm.dev, "PEDR = %x, GPIO_AC_IN = %d, "
        "GPIO_CHRG_FULL = %d, GPIO_KEY_INT = %d, GPIO_WAKEUP = %d\n",
        PEDR, gpio_get_value(CORGI_GPIO_AC_IN),
        gpio_get_value(CORGI_GPIO_CHRG_FULL),
        gpio_get_value(CORGI_GPIO_KEY_INT),
        gpio_get_value(CORGI_GPIO_WAKEUP));

    if ((PEDR & GPIO_bit(CORGI_GPIO_AC_IN))) {
        if (sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN)) {
            /* charge on */
            dev_dbg(sharpsl_pm.dev, "ac insert\n");
            sharpsl_pm.flags |= SHARPSL_DO_OFFLINE_CHRG;
        } else {
            /* charge off */
            dev_dbg(sharpsl_pm.dev, "ac remove\n");
            sharpsl_pm_led(SHARPSL_LED_OFF);
            sharpsl_pm.machinfo->charge(0);
            sharpsl_pm.charge_mode = CHRG_OFF;
        }
    }

    if ((PEDR & GPIO_bit(CORGI_GPIO_CHRG_FULL)))
        dev_dbg(sharpsl_pm.dev, "Charge full interrupt\n");

    if (PEDR & GPIO_bit(CORGI_GPIO_KEY_INT))
        is_resume |= GPIO_bit(CORGI_GPIO_KEY_INT);

    if (PEDR & GPIO_bit(CORGI_GPIO_WAKEUP))
        is_resume |= GPIO_bit(CORGI_GPIO_WAKEUP);

    if (resume_on_alarm && (PEDR & PWER_RTC))
        is_resume |= PWER_RTC;

    dev_dbg(sharpsl_pm.dev, "is_resume: %x\n",is_resume);
    return is_resume;
}

static unsigned long corgi_charger_wakeup(void)
{
    unsigned long ret;

    ret = (!gpio_get_value(CORGI_GPIO_AC_IN) << GPIO_bit(CORGI_GPIO_AC_IN))
        | (!gpio_get_value(CORGI_GPIO_KEY_INT)
        << GPIO_bit(CORGI_GPIO_KEY_INT))
        | (!gpio_get_value(CORGI_GPIO_WAKEUP)
        << GPIO_bit(CORGI_GPIO_WAKEUP));
    return ret;
}

unsigned long corgipm_read_devdata(int type)
{
    switch(type) {
    case SHARPSL_STATUS_ACIN:
        return !gpio_get_value(CORGI_GPIO_AC_IN);
    case SHARPSL_STATUS_LOCK:
        return gpio_get_value(sharpsl_pm.machinfo->gpio_batlock);
    case SHARPSL_STATUS_CHRGFULL:
        return gpio_get_value(sharpsl_pm.machinfo->gpio_batfull);
    case SHARPSL_STATUS_FATAL:
        return gpio_get_value(sharpsl_pm.machinfo->gpio_fatal);
    case SHARPSL_ACIN_VOLT:
        return sharpsl_pm_pxa_read_max1111(MAX1111_ACIN_VOLT);
    case SHARPSL_BATT_TEMP:
        return sharpsl_pm_pxa_read_max1111(MAX1111_BATT_TEMP);
    case SHARPSL_BATT_VOLT:
    default:
        return sharpsl_pm_pxa_read_max1111(MAX1111_BATT_VOLT);
    }
}

static struct sharpsl_charger_machinfo corgi_pm_machinfo = {
    .init            = corgi_charger_init,
    .exit            = NULL,
    .gpio_batlock    = CORGI_GPIO_BAT_COVER,
    .gpio_acin       = CORGI_GPIO_AC_IN,
    .gpio_batfull    = CORGI_GPIO_CHRG_FULL,
    .discharge       = corgi_discharge,
    .charge          = corgi_charge,
    .measure_temp    = corgi_measure_temp,
    .presuspend      = corgi_presuspend,
    .postsuspend     = corgi_postsuspend,
    .read_devdata    = corgipm_read_devdata,
    .charger_wakeup  = corgi_charger_wakeup,
    .should_wakeup   = corgi_should_wakeup,
#if defined(CONFIG_LCD_CORGI)
    .backlight_limit = corgi_lcd_limit_intensity,
#endif
    .charge_on_volt   = SHARPSL_CHARGE_ON_VOLT,
    .charge_on_temp   = SHARPSL_CHARGE_ON_TEMP,
    .charge_acin_high = SHARPSL_CHARGE_ON_ACIN_HIGH,
    .charge_acin_low  = SHARPSL_CHARGE_ON_ACIN_LOW,
    .fatal_acin_volt  = SHARPSL_FATAL_ACIN_VOLT,
    .fatal_noacin_volt= SHARPSL_FATAL_NOACIN_VOLT,
    .bat_levels       = 40,
    .bat_levels_noac  = sharpsl_battery_levels_noac,
    .bat_levels_acin  = sharpsl_battery_levels_acin,
    .status_high_acin = 188,
    .status_low_acin  = 178,
    .status_high_noac = 185,
    .status_low_noac  = 175,
};

static struct platform_device *corgipm_device;

static int __devinit corgipm_init(void)
{
    int ret;

    if (!machine_is_corgi() && !machine_is_shepherd()
            && !machine_is_husky())
        return -ENODEV;

    corgipm_device = platform_device_alloc("sharpsl-pm", -1);
    if (!corgipm_device)
        return -ENOMEM;

    if (!machine_is_corgi())
        corgi_pm_machinfo.batfull_irq = 1;

    corgipm_device->dev.platform_data = &corgi_pm_machinfo;
    ret = platform_device_add(corgipm_device);

    if (ret)
        platform_device_put(corgipm_device);

    return ret;
}

static void corgipm_exit(void)
{
    platform_device_unregister(corgipm_device);
}

module_init(corgipm_init);
module_exit(corgipm_exit);