spitz_pm.c

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/*
 * Battery and Power Management code for the Sharp SL-Cxx00
 *
 * 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 <asm/irq.h>
#include <asm/mach-types.h>
#include <mach/hardware.h>

#include <mach/spitz.h>
#include <mach/pxa27x.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 int spitz_last_ac_status;

static struct gpio spitz_charger_gpios[] = {
    { SPITZ_GPIO_KEY_INT,   GPIOF_IN, "Keyboard Interrupt" },
    { SPITZ_GPIO_SYNC,  GPIOF_IN, "Sync" },
    { SPITZ_GPIO_AC_IN,     GPIOF_IN, "Charger Detection" },
    { SPITZ_GPIO_ADC_TEMP_ON, GPIOF_OUT_INIT_LOW, "ADC Temp On" },
    { SPITZ_GPIO_JK_B,    GPIOF_OUT_INIT_LOW, "JK B" },
    { SPITZ_GPIO_CHRG_ON,     GPIOF_OUT_INIT_LOW, "Charger On" },
};

static void spitz_charger_init(void)
{
    gpio_request_array(ARRAY_AND_SIZE(spitz_charger_gpios));
}

static void spitz_measure_temp(int on)
{
    gpio_set_value(SPITZ_GPIO_ADC_TEMP_ON, on);
}

static void spitz_charge(int on)
{
    if (on) {
        if (sharpsl_pm.flags & SHARPSL_SUSPENDED) {
            gpio_set_value(SPITZ_GPIO_JK_B, 1);
            gpio_set_value(SPITZ_GPIO_CHRG_ON, 0);
        } else {
            gpio_set_value(SPITZ_GPIO_JK_B, 0);
            gpio_set_value(SPITZ_GPIO_CHRG_ON, 0);
        }
    } else {
        gpio_set_value(SPITZ_GPIO_JK_B, 0);
        gpio_set_value(SPITZ_GPIO_CHRG_ON, 1);
    }
}

static void spitz_discharge(int on)
{
    gpio_set_value(SPITZ_GPIO_JK_A, on);
}

/* HACK - For unknown reasons, accurate voltage readings are only made with a load
   on the power bus which the green led on spitz provides */
static void spitz_discharge1(int on)
{
    gpio_set_value(SPITZ_GPIO_LED_GREEN, on);
}

static unsigned long gpio18_config = GPIO18_GPIO;

static void spitz_presuspend(void)
{
    spitz_last_ac_status = sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN);

    /* GPIO Sleep Register */
    PGSR0 = 0x00144018;
    PGSR1 = 0x00EF0000;
    if (machine_is_akita()) {
        PGSR2 = 0x2121C000;
        PGSR3 = 0x00600400;
    } else {
        PGSR2 = 0x0121C000;
        PGSR3 = 0x00600000;
    }

    PGSR0 &= ~SPITZ_GPIO_G0_STROBE_BIT;
    PGSR1 &= ~SPITZ_GPIO_G1_STROBE_BIT;
    PGSR2 &= ~SPITZ_GPIO_G2_STROBE_BIT;
    PGSR3 &= ~SPITZ_GPIO_G3_STROBE_BIT;
    PGSR2 |= GPIO_bit(SPITZ_GPIO_KEY_STROBE0);

    pxa2xx_mfp_config(&gpio18_config, 1);
    gpio_request_one(18, GPIOF_OUT_INIT_HIGH, "Unknown");
    gpio_free(18);

    PRER = GPIO_bit(SPITZ_GPIO_KEY_INT);
    PFER = GPIO_bit(SPITZ_GPIO_KEY_INT) | GPIO_bit(SPITZ_GPIO_RESET);
    PWER = GPIO_bit(SPITZ_GPIO_KEY_INT) | GPIO_bit(SPITZ_GPIO_RESET) | PWER_RTC;
    PKWR = GPIO_bit(SPITZ_GPIO_SYNC) | GPIO_bit(SPITZ_GPIO_KEY_INT) | GPIO_bit(SPITZ_GPIO_RESET);
    PKSR = 0xffffffff; /* clear */

    /* nRESET_OUT Disable */
    PSLR |= PSLR_SL_ROD;

    /* Stop 3.6MHz and drive HIGH to PCMCIA and CS */
    PCFR = PCFR_GPR_EN | PCFR_OPDE;
}

static void spitz_postsuspend(void)
{
}

static int spitz_should_wakeup(unsigned int resume_on_alarm)
{
    int is_resume = 0;
    int acin = sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN);

    if (spitz_last_ac_status != acin) {
        if (acin) {
            /* charge on */
            sharpsl_pm.flags |= SHARPSL_DO_OFFLINE_CHRG;
            dev_dbg(sharpsl_pm.dev, "AC Inserted\n");
        } else {
            /* charge off */
            dev_dbg(sharpsl_pm.dev, "AC Removed\n");
            sharpsl_pm_led(SHARPSL_LED_OFF);
            sharpsl_pm.machinfo->charge(0);
            sharpsl_pm.charge_mode = CHRG_OFF;
        }
        spitz_last_ac_status = acin;
        /* Return to suspend as this must be what we were woken for */
        return 0;
    }

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

    if (PKSR & GPIO_bit(SPITZ_GPIO_SYNC))
        is_resume |= GPIO_bit(SPITZ_GPIO_SYNC);

    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 spitz_charger_wakeup(void)
{
    unsigned long ret;
    ret = ((!gpio_get_value(SPITZ_GPIO_KEY_INT)
        << GPIO_bit(SPITZ_GPIO_KEY_INT))
        | gpio_get_value(SPITZ_GPIO_SYNC));
    return ret;
}

unsigned long spitzpm_read_devdata(int type)
{
    switch (type) {
    case SHARPSL_STATUS_ACIN:
        return !gpio_get_value(SPITZ_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);
    }
}

struct sharpsl_charger_machinfo spitz_pm_machinfo = {
    .init             = spitz_charger_init,
    .exit             = NULL,
    .gpio_batlock     = SPITZ_GPIO_BAT_COVER,
    .gpio_acin        = SPITZ_GPIO_AC_IN,
    .gpio_batfull     = SPITZ_GPIO_CHRG_FULL,
    .batfull_irq      = 1,
    .gpio_fatal       = SPITZ_GPIO_FATAL_BAT,
    .discharge        = spitz_discharge,
    .discharge1       = spitz_discharge1,
    .charge           = spitz_charge,
    .measure_temp     = spitz_measure_temp,
    .presuspend       = spitz_presuspend,
    .postsuspend      = spitz_postsuspend,
    .read_devdata     = spitzpm_read_devdata,
    .charger_wakeup   = spitz_charger_wakeup,
    .should_wakeup    = spitz_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 *spitzpm_device;

static int __devinit spitzpm_init(void)
{
    int ret;

    if (!machine_is_spitz() && !machine_is_akita()
            && !machine_is_borzoi())
        return -ENODEV;

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

    spitzpm_device->dev.platform_data = &spitz_pm_machinfo;
    ret = platform_device_add(spitzpm_device);

    if (ret)
        platform_device_put(spitzpm_device);

    return ret;
}

static void spitzpm_exit(void)
{
    platform_device_unregister(spitzpm_device);
}

module_init(spitzpm_init);
module_exit(spitzpm_exit);