// SPDX-License-Identifier: GPL-2.0-only
/*
 * Battery and Power Management code for the Sharp SL-Cxx00
 *
 * Copyright (c) 2005 Richard Purdie
 */

#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/spi/corgi_lcd.h>

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

#include "spitz.h"
#include "pxa27x.h"
#include "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 void spitz_charger_init(void)
{
        gpio_request(SPITZ_GPIO_KEY_INT, "Keyboard Interrupt");
        gpio_direction_input(SPITZ_GPIO_KEY_INT);
        gpio_request(SPITZ_GPIO_SYNC, "Sync");
        gpio_direction_input(SPITZ_GPIO_SYNC);
        gpio_request(SPITZ_GPIO_AC_IN, "Charger Detection");
        gpio_direction_input(SPITZ_GPIO_AC_IN);
        gpio_request(SPITZ_GPIO_ADC_TEMP_ON, "ADC Temp On");
        gpio_direction_output(SPITZ_GPIO_ADC_TEMP_ON, 0);
        gpio_request(SPITZ_GPIO_JK_B, "JK B");
        gpio_direction_output(SPITZ_GPIO_JK_B, 0);
        gpio_request(SPITZ_GPIO_CHRG_ON, "Charger On");
        gpio_direction_output(SPITZ_GPIO_CHRG_ON, 0);
}

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 bool spitz_charger_wakeup(void)
{
        return !gpio_get_value(SPITZ_GPIO_KEY_INT) ||
                gpio_get_value(SPITZ_GPIO_SYNC);
}

static 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 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);