Quelle  sharpsl_pm.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Battery and Power Management code for the Sharp SL-C7xx and SL-Cxx00
 * series of PDAs
 *
 * Copyright (c) 2004-2005 Richard Purdie
 *
 * Based on code written by Sharp for 2.4 kernels
 */

#undef DEBUG

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/apm-emulation.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/leds.h>
#include <linux/suspend.h>
#include <linux/gpio.h>
#include <linux/io.h>

#include <asm/mach-types.h>
#include "pm.h"
#include "pxa2xx-regs.h"
#include "regs-rtc.h"
#include "sharpsl_pm.h"

/*
 * Constants
 */
#define SHARPSL_CHARGE_ON_TIME_INTERVAL        (secs_to_jiffies(60))
#define SHARPSL_CHARGE_FINISH_TIME             (secs_to_jiffies(10*60))
#define SHARPSL_BATCHK_TIME                    (secs_to_jiffies(15))
#define SHARPSL_BATCHK_TIME_SUSPEND            (60*10) /* 10 min */

#define SHARPSL_WAIT_CO_TIME                   15  /* 15 sec */
#define SHARPSL_WAIT_DISCHARGE_ON              100 /* 100 msec */
#define SHARPSL_CHECK_BATTERY_WAIT_TIME_TEMP   10  /* 10 msec */
#define SHARPSL_CHECK_BATTERY_WAIT_TIME_VOLT   10  /* 10 msec */
#define SHARPSL_CHECK_BATTERY_WAIT_TIME_ACIN   10  /* 10 msec */
#define SHARPSL_CHARGE_WAIT_TIME               15  /* 15 msec */
#define SHARPSL_CHARGE_CO_CHECK_TIME           5   /* 5 msec */
#define SHARPSL_CHARGE_RETRY_CNT               1   /* eqv. 10 min */

/*
 * Prototypes
 */
#ifdef CONFIG_PM
static int sharpsl_off_charge_battery(void);
static int sharpsl_check_battery_voltage(void);
#endif
static int sharpsl_check_battery_temp(void);
static int sharpsl_ac_check(void);
static int sharpsl_average_value(int ad);
static void sharpsl_average_clear(void);
static void sharpsl_charge_toggle(struct work_struct *private_);
static void sharpsl_battery_thread(struct work_struct *private_);


/*
 * Variables
 */
struct sharpsl_pm_status sharpsl_pm;
static DECLARE_DELAYED_WORK(toggle_charger, sharpsl_charge_toggle);
static DECLARE_DELAYED_WORK(sharpsl_bat, sharpsl_battery_thread);
DEFINE_LED_TRIGGER(sharpsl_charge_led_trigger);



struct battery_thresh sharpsl_battery_levels_acin[] = {
 { 213, 100},
 { 212,  98},
 { 211,  95},
 { 210,  93},
 { 209,  90},
 { 208,  88},
 { 207,  85},
 { 206,  83},
 { 205,  80},
 { 204,  78},
 { 203,  75},
 { 202,  73},
 { 201,  70},
 { 200,  68},
 { 199,  65},
 { 198,  63},
 { 197,  60},
 { 196,  58},
 { 195,  55},
 { 194,  53},
 { 193,  50},
 { 192,  48},
 { 192,  45},
 { 191,  43},
 { 191,  40},
 { 190,  38},
 { 190,  35},
 { 189,  33},
 { 188,  30},
 { 187,  28},
 { 186,  25},
 { 185,  23},
 { 184,  20},
 { 183,  18},
 { 182,  15},
 { 181,  13},
 { 180,  10},
 { 179,   8},
 { 178,   5},
 {   0,   0},
};

struct battery_thresh sharpsl_battery_levels_noac[] = {
 { 213, 100},
 { 212,  98},
 { 211,  95},
 { 210,  93},
 { 209,  90},
 { 208,  88},
 { 207,  85},
 { 206,  83},
 { 205,  80},
 { 204,  78},
 { 203,  75},
 { 202,  73},
 { 201,  70},
 { 200,  68},
 { 199,  65},
 { 198,  63},
 { 197,  60},
 { 196,  58},
 { 195,  55},
 { 194,  53},
 { 193,  50},
 { 192,  48},
 { 191,  45},
 { 190,  43},
 { 189,  40},
 { 188,  38},
 { 187,  35},
 { 186,  33},
 { 185,  30},
 { 184,  28},
 { 183,  25},
 { 182,  23},
 { 181,  20},
 { 180,  18},
 { 179,  15},
 { 178,  13},
 { 177,  10},
 { 176,   8},
 { 175,   5},
 {   0,   0},
};

/* MAX1111 Commands */
#define MAXCTRL_PD0      (1u << 0)
#define MAXCTRL_PD1      (1u << 1)
#define MAXCTRL_SGL      (1u << 2)
#define MAXCTRL_UNI      (1u << 3)
#define MAXCTRL_SEL_SH   4
#define MAXCTRL_STR      (1u << 7)

extern int max1111_read_channel(int);
/*
 * Read MAX1111 ADC
 */
int sharpsl_pm_pxa_read_max1111(int channel)
{
 /* max1111 accepts channels from 0-3, however,
 * it is encoded from 0-7 here in the code.
 */
 return max1111_read_channel(channel >> 1);
}

static int get_percentage(int voltage)
{
 int i = sharpsl_pm.machinfo->bat_levels - 1;
 int bl_status = sharpsl_pm.machinfo->backlight_get_status ? sharpsl_pm.machinfo->backlight_get_status() : 0;
 struct battery_thresh *thresh;

 if (sharpsl_pm.charge_mode == CHRG_ON)
  thresh = bl_status ? sharpsl_pm.machinfo->bat_levels_acin_bl : sharpsl_pm.machinfo->bat_levels_acin;
 else
  thresh = bl_status ? sharpsl_pm.machinfo->bat_levels_noac_bl : sharpsl_pm.machinfo->bat_levels_noac;

 while (i > 0 && (voltage > thresh[i].voltage))
  i--;

 return thresh[i].percentage;
}

static int get_apm_status(int voltage)
{
 int low_thresh, high_thresh;

 if (sharpsl_pm.charge_mode == CHRG_ON) {
  high_thresh = sharpsl_pm.machinfo->status_high_acin;
  low_thresh = sharpsl_pm.machinfo->status_low_acin;
 } else {
  high_thresh = sharpsl_pm.machinfo->status_high_noac;
  low_thresh = sharpsl_pm.machinfo->status_low_noac;
 }

 if (voltage >= high_thresh)
  return APM_BATTERY_STATUS_HIGH;
 if (voltage >= low_thresh)
  return APM_BATTERY_STATUS_LOW;
 return APM_BATTERY_STATUS_CRITICAL;
}

void sharpsl_battery_kick(void)
{
 schedule_delayed_work(&sharpsl_bat, msecs_to_jiffies(125));
}

static void sharpsl_battery_thread(struct work_struct *private_)
{
 int voltage, percent, apm_status, i;

 if (!sharpsl_pm.machinfo)
  return;

 sharpsl_pm.battstat.ac_status = (sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN) ? APM_AC_ONLINE : APM_AC_OFFLINE);

 /* Corgi cannot confirm when battery fully charged so periodically kick! */
 if (!sharpsl_pm.machinfo->batfull_irq && (sharpsl_pm.charge_mode == CHRG_ON)
   && time_after(jiffies, sharpsl_pm.charge_start_time +  SHARPSL_CHARGE_ON_TIME_INTERVAL))
  schedule_delayed_work(&toggle_charger, 0);

 for (i = 0; i < 5; i++) {
  voltage = sharpsl_pm.machinfo->read_devdata(SHARPSL_BATT_VOLT);
  if (voltage > 0)
   break;
 }
 if (voltage <= 0) {
  voltage = sharpsl_pm.machinfo->bat_levels_noac[0].voltage;
  dev_warn(sharpsl_pm.dev, "Warning: Cannot read main battery!\n");
 }

 voltage = sharpsl_average_value(voltage);
 apm_status = get_apm_status(voltage);
 percent = get_percentage(voltage);

 /* At low battery voltages, the voltage has a tendency to start
   creeping back up so we try to avoid this here */
 if ((sharpsl_pm.battstat.ac_status == APM_AC_ONLINE)
     || (apm_status == APM_BATTERY_STATUS_HIGH)
     || percent <= sharpsl_pm.battstat.mainbat_percent) {
  sharpsl_pm.battstat.mainbat_voltage = voltage;
  sharpsl_pm.battstat.mainbat_status = apm_status;
  sharpsl_pm.battstat.mainbat_percent = percent;
 }

 dev_dbg(sharpsl_pm.dev, "Battery: voltage: %d, status: %d, percentage: %d, time: %ld\n", voltage,
   sharpsl_pm.battstat.mainbat_status, sharpsl_pm.battstat.mainbat_percent, jiffies);

 /* Suspend if critical battery level */
 if ((sharpsl_pm.battstat.ac_status != APM_AC_ONLINE)
      && (sharpsl_pm.battstat.mainbat_status == APM_BATTERY_STATUS_CRITICAL)
      && !(sharpsl_pm.flags & SHARPSL_APM_QUEUED)) {
  sharpsl_pm.flags |= SHARPSL_APM_QUEUED;
  dev_err(sharpsl_pm.dev, "Fatal Off\n");
  apm_queue_event(APM_CRITICAL_SUSPEND);
 }

 schedule_delayed_work(&sharpsl_bat, SHARPSL_BATCHK_TIME);
}

void sharpsl_pm_led(int val)
{
 if (val == SHARPSL_LED_ERROR) {
  dev_err(sharpsl_pm.dev, "Charging Error!\n");
 } else if (val == SHARPSL_LED_ON) {
  dev_dbg(sharpsl_pm.dev, "Charge LED On\n");
  led_trigger_event(sharpsl_charge_led_trigger, LED_FULL);
 } else {
  dev_dbg(sharpsl_pm.dev, "Charge LED Off\n");
  led_trigger_event(sharpsl_charge_led_trigger, LED_OFF);
 }
}

static void sharpsl_charge_on(void)
{
 dev_dbg(sharpsl_pm.dev, "Turning Charger On\n");

 sharpsl_pm.full_count = 0;
 sharpsl_pm.charge_mode = CHRG_ON;
 schedule_delayed_work(&toggle_charger, msecs_to_jiffies(250));
 schedule_delayed_work(&sharpsl_bat, msecs_to_jiffies(500));
}

static void sharpsl_charge_off(void)
{
 dev_dbg(sharpsl_pm.dev, "Turning Charger Off\n");

 sharpsl_pm.machinfo->charge(0);
 sharpsl_pm_led(SHARPSL_LED_OFF);
 sharpsl_pm.charge_mode = CHRG_OFF;

 schedule_delayed_work(&sharpsl_bat, 0);
}

static void sharpsl_charge_error(void)
{
 sharpsl_pm_led(SHARPSL_LED_ERROR);
 sharpsl_pm.machinfo->charge(0);
 sharpsl_pm.charge_mode = CHRG_ERROR;
}

static void sharpsl_charge_toggle(struct work_struct *private_)
{
 dev_dbg(sharpsl_pm.dev, "Toggling Charger at time: %lx\n", jiffies);

 if (!sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN)) {
  sharpsl_charge_off();
  return;
 } else if ((sharpsl_check_battery_temp() < 0) || (sharpsl_ac_check() < 0)) {
  sharpsl_charge_error();
  return;
 }

 sharpsl_pm_led(SHARPSL_LED_ON);
 sharpsl_pm.machinfo->charge(0);
 mdelay(SHARPSL_CHARGE_WAIT_TIME);
 sharpsl_pm.machinfo->charge(1);

 sharpsl_pm.charge_start_time = jiffies;
}

static void sharpsl_ac_timer(struct timer_list *unused)
{
 int acin = sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN);

 dev_dbg(sharpsl_pm.dev, "AC Status: %d\n", acin);

 sharpsl_average_clear();
 if (acin && (sharpsl_pm.charge_mode != CHRG_ON))
  sharpsl_charge_on();
 else if (sharpsl_pm.charge_mode == CHRG_ON)
  sharpsl_charge_off();

 schedule_delayed_work(&sharpsl_bat, 0);
}


static irqreturn_t sharpsl_ac_isr(int irq, void *dev_id)
{
 /* Delay the event slightly to debounce */
 /* Must be a smaller delay than the chrg_full_isr below */
 mod_timer(&sharpsl_pm.ac_timer, jiffies + msecs_to_jiffies(250));

 return IRQ_HANDLED;
}

static void sharpsl_chrg_full_timer(struct timer_list *unused)
{
 dev_dbg(sharpsl_pm.dev, "Charge Full at time: %lx\n", jiffies);

 sharpsl_pm.full_count++;

 if (!sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN)) {
  dev_dbg(sharpsl_pm.dev, "Charge Full: AC removed - stop charging!\n");
  if (sharpsl_pm.charge_mode == CHRG_ON)
   sharpsl_charge_off();
 } else if (sharpsl_pm.full_count < 2) {
  dev_dbg(sharpsl_pm.dev, "Charge Full: Count too low\n");
  schedule_delayed_work(&toggle_charger, 0);
 } else if (time_after(jiffies, sharpsl_pm.charge_start_time + SHARPSL_CHARGE_FINISH_TIME)) {
  dev_dbg(sharpsl_pm.dev, "Charge Full: Interrupt generated too slowly - retry.\n");
  schedule_delayed_work(&toggle_charger, 0);
 } else {
  sharpsl_charge_off();
  sharpsl_pm.charge_mode = CHRG_DONE;
  dev_dbg(sharpsl_pm.dev, "Charge Full: Charging Finished\n");
 }
}

/* Charging Finished Interrupt (Not present on Corgi) */
/* Can trigger at the same time as an AC status change so
   delay until after that has been processed */
static irqreturn_t sharpsl_chrg_full_isr(int irq, void *dev_id)
{
 if (sharpsl_pm.flags & SHARPSL_SUSPENDED)
  return IRQ_HANDLED;

 /* delay until after any ac interrupt */
 mod_timer(&sharpsl_pm.chrg_full_timer, jiffies + msecs_to_jiffies(500));

 return IRQ_HANDLED;
}

static irqreturn_t sharpsl_fatal_isr(int irq, void *dev_id)
{
 int is_fatal = 0;

 if (!sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_LOCK)) {
  dev_err(sharpsl_pm.dev, "Battery now Unlocked! Suspending.\n");
  is_fatal = 1;
 }

 if (!sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_FATAL)) {
  dev_err(sharpsl_pm.dev, "Fatal Batt Error! Suspending.\n");
  is_fatal = 1;
 }

 if (!(sharpsl_pm.flags & SHARPSL_APM_QUEUED) && is_fatal) {
  sharpsl_pm.flags |= SHARPSL_APM_QUEUED;
  apm_queue_event(APM_CRITICAL_SUSPEND);
 }

 return IRQ_HANDLED;
}

/*
 * Maintain an average of the last 10 readings
 */
#define SHARPSL_CNV_VALUE_NUM    10
static int sharpsl_ad_index;

static void sharpsl_average_clear(void)
{
 sharpsl_ad_index = 0;
}

static int sharpsl_average_value(int ad)
{
 int i, ad_val = 0;
 static int sharpsl_ad[SHARPSL_CNV_VALUE_NUM+1];

 if (sharpsl_pm.battstat.mainbat_status != APM_BATTERY_STATUS_HIGH) {
  sharpsl_ad_index = 0;
  return ad;
 }

 sharpsl_ad[sharpsl_ad_index] = ad;
 sharpsl_ad_index++;
 if (sharpsl_ad_index >= SHARPSL_CNV_VALUE_NUM) {
  for (i = 0; i < (SHARPSL_CNV_VALUE_NUM-1); i++)
   sharpsl_ad[i] = sharpsl_ad[i+1];
  sharpsl_ad_index = SHARPSL_CNV_VALUE_NUM - 1;
 }
 for (i = 0; i < sharpsl_ad_index; i++)
  ad_val += sharpsl_ad[i];

 return ad_val / sharpsl_ad_index;
}

/*
 * Take an array of 5 integers, remove the maximum and minimum values
 * and return the average.
 */
static int get_select_val(int *val)
{
 int i, j, k, temp, sum = 0;

 /* Find MAX val */
 temp = val[0];
 j = 0;
 for (i = 1; i < 5; i++) {
  if (temp < val[i]) {
   temp = val[i];
   j = i;
  }
 }

 /* Find MIN val */
 temp = val[4];
 k = 4;
 for (i = 3; i >= 0; i--) {
  if (temp > val[i]) {
   temp = val[i];
   k = i;
  }
 }

 for (i = 0; i < 5; i++)
  if (i != j && i != k)
   sum += val[i];

 dev_dbg(sharpsl_pm.dev, "Average: %d from values: %d, %d, %d, %d, %d\n", sum/3, val[0], val[1], val[2], val[3], val[4]);

 return sum/3;
}

static int sharpsl_check_battery_temp(void)
{
 int val, i, buff[5];

 /* Check battery temperature */
 for (i = 0; i < 5; i++) {
  mdelay(SHARPSL_CHECK_BATTERY_WAIT_TIME_TEMP);
  sharpsl_pm.machinfo->measure_temp(1);
  mdelay(SHARPSL_CHECK_BATTERY_WAIT_TIME_TEMP);
  buff[i] = sharpsl_pm.machinfo->read_devdata(SHARPSL_BATT_TEMP);
  sharpsl_pm.machinfo->measure_temp(0);
 }

 val = get_select_val(buff);

 dev_dbg(sharpsl_pm.dev, "Temperature: %d\n", val);
 if (val > sharpsl_pm.machinfo->charge_on_temp) {
  printk(KERN_WARNING "Not charging: temperature out of limits.\n");
  return -1;
 }

 return 0;
}

#ifdef CONFIG_PM
static int sharpsl_check_battery_voltage(void)
{
 int val, i, buff[5];

 /* disable charge, enable discharge */
 sharpsl_pm.machinfo->charge(0);
 sharpsl_pm.machinfo->discharge(1);
 mdelay(SHARPSL_WAIT_DISCHARGE_ON);

 if (sharpsl_pm.machinfo->discharge1)
  sharpsl_pm.machinfo->discharge1(1);

 /* Check battery voltage */
 for (i = 0; i < 5; i++) {
  buff[i] = sharpsl_pm.machinfo->read_devdata(SHARPSL_BATT_VOLT);
  mdelay(SHARPSL_CHECK_BATTERY_WAIT_TIME_VOLT);
 }

 if (sharpsl_pm.machinfo->discharge1)
  sharpsl_pm.machinfo->discharge1(0);

 sharpsl_pm.machinfo->discharge(0);

 val = get_select_val(buff);
 dev_dbg(sharpsl_pm.dev, "Battery Voltage: %d\n", val);

 if (val < sharpsl_pm.machinfo->charge_on_volt)
  return -1;

 return 0;
}
#endif

static int sharpsl_ac_check(void)
{
 int temp, i, buff[5];

 for (i = 0; i < 5; i++) {
  buff[i] = sharpsl_pm.machinfo->read_devdata(SHARPSL_ACIN_VOLT);
  mdelay(SHARPSL_CHECK_BATTERY_WAIT_TIME_ACIN);
 }

 temp = get_select_val(buff);
 dev_dbg(sharpsl_pm.dev, "AC Voltage: %d\n", temp);

 if ((temp > sharpsl_pm.machinfo->charge_acin_high) || (temp < sharpsl_pm.machinfo->charge_acin_low)) {
  dev_err(sharpsl_pm.dev, "Error: AC check failed: voltage %d.\n", temp);
  return -1;
 }

 return 0;
}

#ifdef CONFIG_PM
static int sharpsl_pm_suspend(struct platform_device *pdev, pm_message_t state)
{
 sharpsl_pm.flags |= SHARPSL_SUSPENDED;
 flush_delayed_work(&toggle_charger);
 flush_delayed_work(&sharpsl_bat);

 if (sharpsl_pm.charge_mode == CHRG_ON)
  sharpsl_pm.flags |= SHARPSL_DO_OFFLINE_CHRG;
 else
  sharpsl_pm.flags &= ~SHARPSL_DO_OFFLINE_CHRG;

 return 0;
}

static int sharpsl_pm_resume(struct platform_device *pdev)
{
 /* Clear the reset source indicators as they break the bootloader upon reboot */
 RCSR = 0x0f;
 sharpsl_average_clear();
 sharpsl_pm.flags &= ~SHARPSL_APM_QUEUED;
 sharpsl_pm.flags &= ~SHARPSL_SUSPENDED;

 return 0;
}

static void corgi_goto_sleep(unsigned long alarm_time, unsigned int alarm_enable, suspend_state_t state)
{
 dev_dbg(sharpsl_pm.dev, "Time is: %08x\n", RCNR);

 dev_dbg(sharpsl_pm.dev, "Offline Charge Activate = %d\n", sharpsl_pm.flags & SHARPSL_DO_OFFLINE_CHRG);
 /* not charging and AC-IN! */

 if ((sharpsl_pm.flags & SHARPSL_DO_OFFLINE_CHRG) && (sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN))) {
  dev_dbg(sharpsl_pm.dev, "Activating Offline Charger...\n");
  sharpsl_pm.charge_mode = CHRG_OFF;
  sharpsl_pm.flags &= ~SHARPSL_DO_OFFLINE_CHRG;
  sharpsl_off_charge_battery();
 }

 sharpsl_pm.machinfo->presuspend();

 PEDR = 0xffffffff; /* clear it */

 sharpsl_pm.flags &= ~SHARPSL_ALARM_ACTIVE;
 if ((sharpsl_pm.charge_mode == CHRG_ON) && ((alarm_enable && ((alarm_time - RCNR) > (SHARPSL_BATCHK_TIME_SUSPEND + 30))) || !alarm_enable)) {
  RTSR &= RTSR_ALE;
  RTAR = RCNR + SHARPSL_BATCHK_TIME_SUSPEND;
  dev_dbg(sharpsl_pm.dev, "Charging alarm at: %08x\n", RTAR);
  sharpsl_pm.flags |= SHARPSL_ALARM_ACTIVE;
 } else if (alarm_enable) {
  RTSR &= RTSR_ALE;
  RTAR = alarm_time;
  dev_dbg(sharpsl_pm.dev, "User alarm at: %08x\n", RTAR);
 } else {
  dev_dbg(sharpsl_pm.dev, "No alarms set.\n");
 }

 pxa_pm_enter(state);

 sharpsl_pm.machinfo->postsuspend();

 dev_dbg(sharpsl_pm.dev, "Corgi woken up from suspend: %08x\n", PEDR);
}

static int corgi_enter_suspend(unsigned long alarm_time, unsigned int alarm_enable, suspend_state_t state)
{
 if (!sharpsl_pm.machinfo->should_wakeup(!(sharpsl_pm.flags & SHARPSL_ALARM_ACTIVE) && alarm_enable)) {
  if (!(sharpsl_pm.flags & SHARPSL_ALARM_ACTIVE)) {
   dev_dbg(sharpsl_pm.dev, "No user triggered wakeup events and not charging. Strange. Suspend.\n");
   corgi_goto_sleep(alarm_time, alarm_enable, state);
   return 1;
  }
  if (sharpsl_off_charge_battery()) {
   dev_dbg(sharpsl_pm.dev, "Charging. Suspend...\n");
   corgi_goto_sleep(alarm_time, alarm_enable, state);
   return 1;
  }
  dev_dbg(sharpsl_pm.dev, "User triggered wakeup in offline charger.\n");
 }

 if ((!sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_LOCK)) ||
     (!sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_FATAL))) {
  dev_err(sharpsl_pm.dev, "Fatal condition. Suspend.\n");
  corgi_goto_sleep(alarm_time, alarm_enable, state);
  return 1;
 }

 return 0;
}

static int corgi_pxa_pm_enter(suspend_state_t state)
{
 unsigned long alarm_time = RTAR;
 unsigned int alarm_status = ((RTSR & RTSR_ALE) != 0);

 dev_dbg(sharpsl_pm.dev, "SharpSL suspending for first time.\n");

 corgi_goto_sleep(alarm_time, alarm_status, state);

 while (corgi_enter_suspend(alarm_time, alarm_status, state))
  {}

 if (sharpsl_pm.machinfo->earlyresume)
  sharpsl_pm.machinfo->earlyresume();

 dev_dbg(sharpsl_pm.dev, "SharpSL resuming...\n");

 return 0;
}

static int sharpsl_off_charge_error(void)
{
 dev_err(sharpsl_pm.dev, "Offline Charger: Error occurred.\n");
 sharpsl_pm.machinfo->charge(0);
 sharpsl_pm_led(SHARPSL_LED_ERROR);
 sharpsl_pm.charge_mode = CHRG_ERROR;
 return 1;
}

/*
 * Charging Control while suspended
 * Return 1 - go straight to sleep
 * Return 0 - sleep or wakeup depending on other factors
 */
static int sharpsl_off_charge_battery(void)
{
 int time;

 dev_dbg(sharpsl_pm.dev, "Charge Mode: %d\n", sharpsl_pm.charge_mode);

 if (sharpsl_pm.charge_mode == CHRG_OFF) {
  dev_dbg(sharpsl_pm.dev, "Offline Charger: Step 1\n");

  /* AC Check */
  if ((sharpsl_ac_check() < 0) || (sharpsl_check_battery_temp() < 0))
   return sharpsl_off_charge_error();

  /* Start Charging */
  sharpsl_pm_led(SHARPSL_LED_ON);
  sharpsl_pm.machinfo->charge(0);
  mdelay(SHARPSL_CHARGE_WAIT_TIME);
  sharpsl_pm.machinfo->charge(1);

  sharpsl_pm.charge_mode = CHRG_ON;
  sharpsl_pm.full_count = 0;

  return 1;
 } else if (sharpsl_pm.charge_mode != CHRG_ON) {
  return 1;
 }

 if (sharpsl_pm.full_count == 0) {
  int time;

  dev_dbg(sharpsl_pm.dev, "Offline Charger: Step 2\n");

  if ((sharpsl_check_battery_temp() < 0) || (sharpsl_check_battery_voltage() < 0))
   return sharpsl_off_charge_error();

  sharpsl_pm.machinfo->charge(0);
  mdelay(SHARPSL_CHARGE_WAIT_TIME);
  sharpsl_pm.machinfo->charge(1);
  sharpsl_pm.charge_mode = CHRG_ON;

  mdelay(SHARPSL_CHARGE_CO_CHECK_TIME);

  time = RCNR;
  while (1) {
   /* Check if any wakeup event had occurred */
   if (sharpsl_pm.machinfo->charger_wakeup())
    return 0;
   /* Check for timeout */
   if ((RCNR - time) > SHARPSL_WAIT_CO_TIME)
    return 1;
   if (sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_CHRGFULL)) {
    dev_dbg(sharpsl_pm.dev, "Offline Charger: Charge full occurred. Retrying to check\n");
    sharpsl_pm.full_count++;
    sharpsl_pm.machinfo->charge(0);
    mdelay(SHARPSL_CHARGE_WAIT_TIME);
    sharpsl_pm.machinfo->charge(1);
    return 1;
   }
  }
 }

 dev_dbg(sharpsl_pm.dev, "Offline Charger: Step 3\n");

 mdelay(SHARPSL_CHARGE_CO_CHECK_TIME);

 time = RCNR;
 while (1) {
  /* Check if any wakeup event had occurred */
  if (sharpsl_pm.machinfo->charger_wakeup())
   return 0;
  /* Check for timeout */
  if ((RCNR-time) > SHARPSL_WAIT_CO_TIME) {
   if (sharpsl_pm.full_count > SHARPSL_CHARGE_RETRY_CNT) {
    dev_dbg(sharpsl_pm.dev, "Offline Charger: Not charged sufficiently. Retrying.\n");
    sharpsl_pm.full_count = 0;
   }
   sharpsl_pm.full_count++;
   return 1;
  }
  if (sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_CHRGFULL)) {
   dev_dbg(sharpsl_pm.dev, "Offline Charger: Charging complete.\n");
   sharpsl_pm_led(SHARPSL_LED_OFF);
   sharpsl_pm.machinfo->charge(0);
   sharpsl_pm.charge_mode = CHRG_DONE;
   return 1;
  }
 }
}
#else
#define sharpsl_pm_suspend NULL
#define sharpsl_pm_resume NULL
#endif

static ssize_t battery_percentage_show(struct device *dev, struct device_attribute *attr, char *buf)
{
 return sprintf(buf, "%d\n", sharpsl_pm.battstat.mainbat_percent);
}

static ssize_t battery_voltage_show(struct device *dev, struct device_attribute *attr, char *buf)
{
 return sprintf(buf, "%d\n", sharpsl_pm.battstat.mainbat_voltage);
}

static DEVICE_ATTR_RO(battery_percentage);
static DEVICE_ATTR_RO(battery_voltage);

extern void (*apm_get_power_status)(struct apm_power_info *);

static void sharpsl_apm_get_power_status(struct apm_power_info *info)
{
 info->ac_line_status = sharpsl_pm.battstat.ac_status;

 if (sharpsl_pm.charge_mode == CHRG_ON)
  info->battery_status = APM_BATTERY_STATUS_CHARGING;
 else
  info->battery_status = sharpsl_pm.battstat.mainbat_status;

 info->battery_flag = (1 << info->battery_status);
 info->battery_life = sharpsl_pm.battstat.mainbat_percent;
}

#ifdef CONFIG_PM
static const struct platform_suspend_ops sharpsl_pm_ops = {
 .prepare = pxa_pm_prepare,
 .finish  = pxa_pm_finish,
 .enter  = corgi_pxa_pm_enter,
 .valid  = suspend_valid_only_mem,
};
#endif

static int sharpsl_pm_probe(struct platform_device *pdev)
{
 int ret, irq;

 if (!pdev->dev.platform_data)
  return -EINVAL;

 sharpsl_pm.dev = &pdev->dev;
 sharpsl_pm.machinfo = pdev->dev.platform_data;
 sharpsl_pm.charge_mode = CHRG_OFF;
 sharpsl_pm.flags = 0;

 timer_setup(&sharpsl_pm.ac_timer, sharpsl_ac_timer, 0);

 timer_setup(&sharpsl_pm.chrg_full_timer, sharpsl_chrg_full_timer, 0);

 led_trigger_register_simple("sharpsl-charge", &sharpsl_charge_led_trigger);

 sharpsl_pm.machinfo->init();

 gpio_request(sharpsl_pm.machinfo->gpio_acin, "AC IN");
 gpio_direction_input(sharpsl_pm.machinfo->gpio_acin);
 gpio_request(sharpsl_pm.machinfo->gpio_batfull, "Battery Full");
 gpio_direction_input(sharpsl_pm.machinfo->gpio_batfull);
 gpio_request(sharpsl_pm.machinfo->gpio_batlock, "Battery Lock");
 gpio_direction_input(sharpsl_pm.machinfo->gpio_batlock);

 /* Register interrupt handlers */
 irq = gpio_to_irq(sharpsl_pm.machinfo->gpio_acin);
 if (request_irq(irq, sharpsl_ac_isr, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, "AC Input Detect", sharpsl_ac_isr)) {
  dev_err(sharpsl_pm.dev, "Could not get irq %d.\n", irq);
 }

 irq = gpio_to_irq(sharpsl_pm.machinfo->gpio_batlock);
 if (request_irq(irq, sharpsl_fatal_isr, IRQF_TRIGGER_FALLING, "Battery Cover", sharpsl_fatal_isr)) {
  dev_err(sharpsl_pm.dev, "Could not get irq %d.\n", irq);
 }

 if (sharpsl_pm.machinfo->gpio_fatal) {
  irq = gpio_to_irq(sharpsl_pm.machinfo->gpio_fatal);
  if (request_irq(irq, sharpsl_fatal_isr, IRQF_TRIGGER_FALLING, "Fatal Battery", sharpsl_fatal_isr)) {
   dev_err(sharpsl_pm.dev, "Could not get irq %d.\n", irq);
  }
 }

 if (sharpsl_pm.machinfo->batfull_irq) {
  /* Register interrupt handler. */
  irq = gpio_to_irq(sharpsl_pm.machinfo->gpio_batfull);
  if (request_irq(irq, sharpsl_chrg_full_isr, IRQF_TRIGGER_RISING, "CO", sharpsl_chrg_full_isr)) {
   dev_err(sharpsl_pm.dev, "Could not get irq %d.\n", irq);
  }
 }

 ret = device_create_file(&pdev->dev, &dev_attr_battery_percentage);
 ret |= device_create_file(&pdev->dev, &dev_attr_battery_voltage);
 if (ret != 0)
  dev_warn(&pdev->dev, "Failed to register attributes (%d)\n", ret);

 apm_get_power_status = sharpsl_apm_get_power_status;

#ifdef CONFIG_PM
 suspend_set_ops(&sharpsl_pm_ops);
#endif

 mod_timer(&sharpsl_pm.ac_timer, jiffies + msecs_to_jiffies(250));

 return 0;
}

static void sharpsl_pm_remove(struct platform_device *pdev)
{
 suspend_set_ops(NULL);

 device_remove_file(&pdev->dev, &dev_attr_battery_percentage);
 device_remove_file(&pdev->dev, &dev_attr_battery_voltage);

 led_trigger_unregister_simple(sharpsl_charge_led_trigger);

 free_irq(gpio_to_irq(sharpsl_pm.machinfo->gpio_acin), sharpsl_ac_isr);
 free_irq(gpio_to_irq(sharpsl_pm.machinfo->gpio_batlock), sharpsl_fatal_isr);

 if (sharpsl_pm.machinfo->gpio_fatal)
  free_irq(gpio_to_irq(sharpsl_pm.machinfo->gpio_fatal), sharpsl_fatal_isr);

 if (sharpsl_pm.machinfo->batfull_irq)
  free_irq(gpio_to_irq(sharpsl_pm.machinfo->gpio_batfull), sharpsl_chrg_full_isr);

 gpio_free(sharpsl_pm.machinfo->gpio_batlock);
 gpio_free(sharpsl_pm.machinfo->gpio_batfull);
 gpio_free(sharpsl_pm.machinfo->gpio_acin);

 if (sharpsl_pm.machinfo->exit)
  sharpsl_pm.machinfo->exit();

 timer_delete_sync(&sharpsl_pm.chrg_full_timer);
 timer_delete_sync(&sharpsl_pm.ac_timer);
}

static struct platform_driver sharpsl_pm_driver = {
 .probe  = sharpsl_pm_probe,
 .remove  = sharpsl_pm_remove,
 .suspend = sharpsl_pm_suspend,
 .resume  = sharpsl_pm_resume,
 .driver  = {
  .name  = "sharpsl-pm",
 },
};

static int sharpsl_pm_init(void)
{
 return platform_driver_register(&sharpsl_pm_driver);
}

static void sharpsl_pm_exit(void)
{
 platform_driver_unregister(&sharpsl_pm_driver);
}

late_initcall(sharpsl_pm_init);
module_exit(sharpsl_pm_exit);