arch/arm/common/sharpsl_pm.c

   1 /*
   2  * Battery and Power Management code for the Sharp SL-C7xx and SL-Cxx00
   3  * series of PDAs
   4  *
   5  * Copyright (c) 2004-2005 Richard Purdie
   6  *
   7  * Based on code written by Sharp for 2.4 kernels
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  */
  14
  15 #undef DEBUG
  16
  17 #include <linux/module.h>
  18 #include <linux/timer.h>
  19 #include <linux/init.h>
  20 #include <linux/kernel.h>
  21 #include <linux/apm_bios.h>
  22 #include <linux/delay.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/leds.h>
  26 #include <linux/apm-emulation.h>
  27 #include <linux/suspend.h>
  28
  29 #include <mach/hardware.h>
  30 #include <asm/irq.h>
  31 #include <mach/pm.h>
  32 #include <mach/pxa2xx-regs.h>
  33 #include <mach/regs-rtc.h>
  34 #include <mach/sharpsl.h>
  35 #include <asm/hardware/sharpsl_pm.h>
  36
  37 /*
  38  * Constants
  39  */
  40 #define SHARPSL_CHARGE_ON_TIME_INTERVAL        (msecs_to_jiffies(1*60*1000))  /* 1 min */
  41 #define SHARPSL_CHARGE_FINISH_TIME             (msecs_to_jiffies(10*60*1000)) /* 10 min */
  42 #define SHARPSL_BATCHK_TIME                    (msecs_to_jiffies(15*1000))    /* 15 sec */
  43 #define SHARPSL_BATCHK_TIME_SUSPEND            (60*10)                        /* 10 min */
  44
  45 #define SHARPSL_WAIT_CO_TIME                   15  /* 15 sec */
  46 #define SHARPSL_WAIT_DISCHARGE_ON              100 /* 100 msec */
  47 #define SHARPSL_CHECK_BATTERY_WAIT_TIME_TEMP   10  /* 10 msec */
  48 #define SHARPSL_CHECK_BATTERY_WAIT_TIME_VOLT   10  /* 10 msec */
  49 #define SHARPSL_CHECK_BATTERY_WAIT_TIME_ACIN   10  /* 10 msec */
  50 #define SHARPSL_CHARGE_WAIT_TIME               15  /* 15 msec */
  51 #define SHARPSL_CHARGE_CO_CHECK_TIME           5   /* 5 msec */
  52 #define SHARPSL_CHARGE_RETRY_CNT               1   /* eqv. 10 min */
  53
  54 /*
  55  * Prototypes
  56  */
  57 #ifdef CONFIG_PM
  58 static int sharpsl_off_charge_battery(void);
  59 static int sharpsl_check_battery_voltage(void);
  60 static int sharpsl_fatal_check(void);
  61 #endif
  62 static int sharpsl_check_battery_temp(void);
  63 static int sharpsl_ac_check(void);
  64 static int sharpsl_average_value(int ad);
  65 static void sharpsl_average_clear(void);
  66 static void sharpsl_charge_toggle(struct work_struct *private_);
  67 static void sharpsl_battery_thread(struct work_struct *private_);
  68
  69
  70 /*
  71  * Variables
  72  */
  73 struct sharpsl_pm_status sharpsl_pm;
  74 DECLARE_DELAYED_WORK(toggle_charger, sharpsl_charge_toggle);
  75 DECLARE_DELAYED_WORK(sharpsl_bat, sharpsl_battery_thread);
  76 DEFINE_LED_TRIGGER(sharpsl_charge_led_trigger);
  77
  78
  79 static int get_percentage(int voltage)
  80 {
  81         int i = sharpsl_pm.machinfo->bat_levels - 1;
  82         int bl_status = sharpsl_pm.machinfo->backlight_get_status ? sharpsl_pm.machinfo->backlight_get_status() : 0;
  83         struct battery_thresh *thresh;
  84
  85         if (sharpsl_pm.charge_mode == CHRG_ON)
  86                 thresh = bl_status ? sharpsl_pm.machinfo->bat_levels_acin_bl : sharpsl_pm.machinfo->bat_levels_acin;
  87         else
  88                 thresh = bl_status ? sharpsl_pm.machinfo->bat_levels_noac_bl : sharpsl_pm.machinfo->bat_levels_noac;
  89
  90         while (i > 0 && (voltage > thresh[i].voltage))
  91                 i--;
  92
  93         return thresh[i].percentage;
  94 }
  95
  96 static int get_apm_status(int voltage)
  97 {
  98         int low_thresh, high_thresh;
  99
 100         if (sharpsl_pm.charge_mode == CHRG_ON) {
 101                 high_thresh = sharpsl_pm.machinfo->status_high_acin;
 102                 low_thresh = sharpsl_pm.machinfo->status_low_acin;
 103         } else {
 104                 high_thresh = sharpsl_pm.machinfo->status_high_noac;
 105                 low_thresh = sharpsl_pm.machinfo->status_low_noac;
 106         }
 107
 108         if (voltage >= high_thresh)
 109                 return APM_BATTERY_STATUS_HIGH;
 110         if (voltage >= low_thresh)
 111                 return APM_BATTERY_STATUS_LOW;
 112         return APM_BATTERY_STATUS_CRITICAL;
 113 }
 114
 115 void sharpsl_battery_kick(void)
 116 {
 117         schedule_delayed_work(&sharpsl_bat, msecs_to_jiffies(125));
 118 }
 119 EXPORT_SYMBOL(sharpsl_battery_kick);
 120
 121
 122 static void sharpsl_battery_thread(struct work_struct *private_)
 123 {
 124         int voltage, percent, apm_status, i = 0;
 125
 126         if (!sharpsl_pm.machinfo)
 127                 return;
 128
 129         sharpsl_pm.battstat.ac_status = (sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN) ? APM_AC_ONLINE : APM_AC_OFFLINE);
 130
 131         /* Corgi cannot confirm when battery fully charged so periodically kick! */
 132         if (!sharpsl_pm.machinfo->batfull_irq && (sharpsl_pm.charge_mode == CHRG_ON)
 133                         && time_after(jiffies, sharpsl_pm.charge_start_time +  SHARPSL_CHARGE_ON_TIME_INTERVAL))
 134                 schedule_delayed_work(&toggle_charger, 0);
 135
 136         while(1) {
 137                 voltage = sharpsl_pm.machinfo->read_devdata(SHARPSL_BATT_VOLT);
 138
 139                 if (voltage > 0) break;
 140                 if (i++ > 5) {
 141                         voltage = sharpsl_pm.machinfo->bat_levels_noac[0].voltage;
 142                         dev_warn(sharpsl_pm.dev, "Warning: Cannot read main battery!\n");
 143                         break;
 144                 }
 145         }
 146
 147         voltage = sharpsl_average_value(voltage);
 148         apm_status = get_apm_status(voltage);
 149         percent = get_percentage(voltage);
 150
 151         /* At low battery voltages, the voltage has a tendency to start
 152            creeping back up so we try to avoid this here */
 153         if ((sharpsl_pm.battstat.ac_status == APM_AC_ONLINE) || (apm_status == APM_BATTERY_STATUS_HIGH) ||  percent <= sharpsl_pm.battstat.mainbat_percent) {
 154                 sharpsl_pm.battstat.mainbat_voltage = voltage;
 155                 sharpsl_pm.battstat.mainbat_status = apm_status;
 156                 sharpsl_pm.battstat.mainbat_percent = percent;
 157         }
 158
 159         dev_dbg(sharpsl_pm.dev, "Battery: voltage: %d, status: %d, percentage: %d, time: %ld\n", voltage,
 160                         sharpsl_pm.battstat.mainbat_status, sharpsl_pm.battstat.mainbat_percent, jiffies);
 161
 162 #ifdef CONFIG_BACKLIGHT_CORGI
 163         /* If battery is low. limit backlight intensity to save power. */
 164         if ((sharpsl_pm.battstat.ac_status != APM_AC_ONLINE)
 165                         && ((sharpsl_pm.battstat.mainbat_status == APM_BATTERY_STATUS_LOW) ||
 166                         (sharpsl_pm.battstat.mainbat_status == APM_BATTERY_STATUS_CRITICAL))) {
 167                 if (!(sharpsl_pm.flags & SHARPSL_BL_LIMIT)) {
 168                         sharpsl_pm.machinfo->backlight_limit(1);
 169                         sharpsl_pm.flags |= SHARPSL_BL_LIMIT;
 170                 }
 171         } else if (sharpsl_pm.flags & SHARPSL_BL_LIMIT) {
 172                 sharpsl_pm.machinfo->backlight_limit(0);
 173                 sharpsl_pm.flags &= ~SHARPSL_BL_LIMIT;
 174         }
 175 #endif
 176
 177         /* Suspend if critical battery level */
 178         if ((sharpsl_pm.battstat.ac_status != APM_AC_ONLINE)
 179                         && (sharpsl_pm.battstat.mainbat_status == APM_BATTERY_STATUS_CRITICAL)
 180                         && !(sharpsl_pm.flags & SHARPSL_APM_QUEUED)) {
 181                 sharpsl_pm.flags |= SHARPSL_APM_QUEUED;
 182                 dev_err(sharpsl_pm.dev, "Fatal Off\n");
 183                 apm_queue_event(APM_CRITICAL_SUSPEND);
 184         }
 185
 186         schedule_delayed_work(&sharpsl_bat, SHARPSL_BATCHK_TIME);
 187 }
 188
 189 void sharpsl_pm_led(int val)
 190 {
 191         if (val == SHARPSL_LED_ERROR) {
 192                 dev_err(sharpsl_pm.dev, "Charging Error!\n");
 193         } else if (val == SHARPSL_LED_ON) {
 194                 dev_dbg(sharpsl_pm.dev, "Charge LED On\n");
 195                 led_trigger_event(sharpsl_charge_led_trigger, LED_FULL);
 196         } else {
 197                 dev_dbg(sharpsl_pm.dev, "Charge LED Off\n");
 198                 led_trigger_event(sharpsl_charge_led_trigger, LED_OFF);
 199         }
 200 }
 201
 202 static void sharpsl_charge_on(void)
 203 {
 204         dev_dbg(sharpsl_pm.dev, "Turning Charger On\n");
 205
 206         sharpsl_pm.full_count = 0;
 207         sharpsl_pm.charge_mode = CHRG_ON;
 208         schedule_delayed_work(&toggle_charger, msecs_to_jiffies(250));
 209         schedule_delayed_work(&sharpsl_bat, msecs_to_jiffies(500));
 210 }
 211
 212 static void sharpsl_charge_off(void)
 213 {
 214         dev_dbg(sharpsl_pm.dev, "Turning Charger Off\n");
 215
 216         sharpsl_pm.machinfo->charge(0);
 217         sharpsl_pm_led(SHARPSL_LED_OFF);
 218         sharpsl_pm.charge_mode = CHRG_OFF;
 219
 220         schedule_delayed_work(&sharpsl_bat, 0);
 221 }
 222
 223 static void sharpsl_charge_error(void)
 224 {
 225         sharpsl_pm_led(SHARPSL_LED_ERROR);
 226         sharpsl_pm.machinfo->charge(0);
 227         sharpsl_pm.charge_mode = CHRG_ERROR;
 228 }
 229
 230 static void sharpsl_charge_toggle(struct work_struct *private_)
 231 {
 232         dev_dbg(sharpsl_pm.dev, "Toogling Charger at time: %lx\n", jiffies);
 233
 234         if (!sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN)) {
 235                 sharpsl_charge_off();
 236                 return;
 237         } else if ((sharpsl_check_battery_temp() < 0) || (sharpsl_ac_check() < 0)) {
 238                 sharpsl_charge_error();
 239                 return;
 240         }
 241
 242         sharpsl_pm_led(SHARPSL_LED_ON);
 243         sharpsl_pm.machinfo->charge(0);
 244         mdelay(SHARPSL_CHARGE_WAIT_TIME);
 245         sharpsl_pm.machinfo->charge(1);
 246
 247         sharpsl_pm.charge_start_time = jiffies;
 248 }
 249
 250 static void sharpsl_ac_timer(unsigned long data)
 251 {
 252         int acin = sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN);
 253
 254         dev_dbg(sharpsl_pm.dev, "AC Status: %d\n",acin);
 255
 256         sharpsl_average_clear();
 257         if (acin && (sharpsl_pm.charge_mode != CHRG_ON))
 258                 sharpsl_charge_on();
 259         else if (sharpsl_pm.charge_mode == CHRG_ON)
 260                 sharpsl_charge_off();
 261
 262         schedule_delayed_work(&sharpsl_bat, 0);
 263 }
 264
 265
 266 irqreturn_t sharpsl_ac_isr(int irq, void *dev_id)
 267 {
 268         /* Delay the event slightly to debounce */
 269         /* Must be a smaller delay than the chrg_full_isr below */
 270         mod_timer(&sharpsl_pm.ac_timer, jiffies + msecs_to_jiffies(250));
 271
 272         return IRQ_HANDLED;
 273 }
 274
 275 static void sharpsl_chrg_full_timer(unsigned long data)
 276 {
 277         dev_dbg(sharpsl_pm.dev, "Charge Full at time: %lx\n", jiffies);
 278
 279         sharpsl_pm.full_count++;
 280
 281         if (!sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN)) {
 282                 dev_dbg(sharpsl_pm.dev, "Charge Full: AC removed - stop charging!\n");
 283                 if (sharpsl_pm.charge_mode == CHRG_ON)
 284                         sharpsl_charge_off();
 285         } else if (sharpsl_pm.full_count < 2) {
 286                 dev_dbg(sharpsl_pm.dev, "Charge Full: Count too low\n");
 287                 schedule_delayed_work(&toggle_charger, 0);
 288         } else if (time_after(jiffies, sharpsl_pm.charge_start_time + SHARPSL_CHARGE_FINISH_TIME)) {
 289                 dev_dbg(sharpsl_pm.dev, "Charge Full: Interrupt generated too slowly - retry.\n");
 290                 schedule_delayed_work(&toggle_charger, 0);
 291         } else {
 292                 sharpsl_charge_off();
 293                 sharpsl_pm.charge_mode = CHRG_DONE;
 294                 dev_dbg(sharpsl_pm.dev, "Charge Full: Charging Finished\n");
 295         }
 296 }
 297
 298 /* Charging Finished Interrupt (Not present on Corgi) */
 299 /* Can trigger at the same time as an AC status change so
 300    delay until after that has been processed */
 301 irqreturn_t sharpsl_chrg_full_isr(int irq, void *dev_id)
 302 {
 303         if (sharpsl_pm.flags & SHARPSL_SUSPENDED)
 304                 return IRQ_HANDLED;
 305
 306         /* delay until after any ac interrupt */
 307         mod_timer(&sharpsl_pm.chrg_full_timer, jiffies + msecs_to_jiffies(500));
 308
 309         return IRQ_HANDLED;
 310 }
 311
 312 irqreturn_t sharpsl_fatal_isr(int irq, void *dev_id)
 313 {
 314         int is_fatal = 0;
 315
 316         if (!sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_LOCK)) {
 317                 dev_err(sharpsl_pm.dev, "Battery now Unlocked! Suspending.\n");
 318                 is_fatal = 1;
 319         }
 320
 321         if (!sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_FATAL)) {
 322                 dev_err(sharpsl_pm.dev, "Fatal Batt Error! Suspending.\n");
 323                 is_fatal = 1;
 324         }
 325
 326         if (!(sharpsl_pm.flags & SHARPSL_APM_QUEUED) && is_fatal) {
 327                 sharpsl_pm.flags |= SHARPSL_APM_QUEUED;
 328                 apm_queue_event(APM_CRITICAL_SUSPEND);
 329         }
 330
 331         return IRQ_HANDLED;
 332 }
 333
 334 /*
 335  * Maintain an average of the last 10 readings
 336  */
 337 #define SHARPSL_CNV_VALUE_NUM    10
 338 static int sharpsl_ad_index;
 339
 340 static void sharpsl_average_clear(void)
 341 {
 342         sharpsl_ad_index = 0;
 343 }
 344
 345 static int sharpsl_average_value(int ad)
 346 {
 347         int i, ad_val = 0;
 348         static int sharpsl_ad[SHARPSL_CNV_VALUE_NUM+1];
 349
 350         if (sharpsl_pm.battstat.mainbat_status != APM_BATTERY_STATUS_HIGH) {
 351                 sharpsl_ad_index = 0;
 352                 return ad;
 353         }
 354
 355         sharpsl_ad[sharpsl_ad_index] = ad;
 356         sharpsl_ad_index++;
 357         if (sharpsl_ad_index >= SHARPSL_CNV_VALUE_NUM) {
 358                 for (i=0; i < (SHARPSL_CNV_VALUE_NUM-1); i++)
 359                         sharpsl_ad[i] = sharpsl_ad[i+1];
 360                 sharpsl_ad_index = SHARPSL_CNV_VALUE_NUM - 1;
 361         }
 362         for (i=0; i < sharpsl_ad_index; i++)
 363                 ad_val += sharpsl_ad[i];
 364
 365         return (ad_val / sharpsl_ad_index);
 366 }
 367
 368 /*
 369  * Take an array of 5 integers, remove the maximum and minimum values
 370  * and return the average.
 371  */
 372 static int get_select_val(int *val)
 373 {
 374         int i, j, k, temp, sum = 0;
 375
 376         /* Find MAX val */
 377         temp = val[0];
 378         j=0;
 379         for (i=1; i<5; i++) {
 380                 if (temp < val[i]) {
 381                         temp = val[i];
 382                         j = i;
 383                 }
 384         }
 385
 386         /* Find MIN val */
 387         temp = val[4];
 388         k=4;
 389         for (i=3; i>=0; i--) {
 390                 if (temp > val[i]) {
 391                         temp = val[i];
 392                         k = i;
 393                 }
 394         }
 395
 396         for (i=0; i<5; i++)
 397                 if (i != j && i != k )
 398                         sum += val[i];
 399
 400         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]);
 401
 402         return (sum/3);
 403 }
 404
 405 static int sharpsl_check_battery_temp(void)
 406 {
 407         int val, i, buff[5];
 408
 409         /* Check battery temperature */
 410         for (i=0; i<5; i++) {
 411                 mdelay(SHARPSL_CHECK_BATTERY_WAIT_TIME_TEMP);
 412                 sharpsl_pm.machinfo->measure_temp(1);
 413                 mdelay(SHARPSL_CHECK_BATTERY_WAIT_TIME_TEMP);
 414                 buff[i] = sharpsl_pm.machinfo->read_devdata(SHARPSL_BATT_TEMP);
 415                 sharpsl_pm.machinfo->measure_temp(0);
 416         }
 417
 418         val = get_select_val(buff);
 419
 420         dev_dbg(sharpsl_pm.dev, "Temperature: %d\n", val);
 421         if (val > sharpsl_pm.machinfo->charge_on_temp) {
 422                 printk(KERN_WARNING "Not charging: temperature out of limits.\n");
 423                 return -1;
 424         }
 425
 426         return 0;
 427 }
 428
 429 #ifdef CONFIG_PM
 430 static int sharpsl_check_battery_voltage(void)
 431 {
 432         int val, i, buff[5];
 433
 434         /* disable charge, enable discharge */
 435         sharpsl_pm.machinfo->charge(0);
 436         sharpsl_pm.machinfo->discharge(1);
 437         mdelay(SHARPSL_WAIT_DISCHARGE_ON);
 438
 439         if (sharpsl_pm.machinfo->discharge1)
 440                 sharpsl_pm.machinfo->discharge1(1);
 441
 442         /* Check battery voltage */
 443         for (i=0; i<5; i++) {
 444                 buff[i] = sharpsl_pm.machinfo->read_devdata(SHARPSL_BATT_VOLT);
 445                 mdelay(SHARPSL_CHECK_BATTERY_WAIT_TIME_VOLT);
 446         }
 447
 448         if (sharpsl_pm.machinfo->discharge1)
 449                 sharpsl_pm.machinfo->discharge1(0);
 450
 451         sharpsl_pm.machinfo->discharge(0);
 452
 453         val = get_select_val(buff);
 454         dev_dbg(sharpsl_pm.dev, "Battery Voltage: %d\n", val);
 455
 456         if (val < sharpsl_pm.machinfo->charge_on_volt)
 457                 return -1;
 458
 459         return 0;
 460 }
 461 #endif
 462
 463 static int sharpsl_ac_check(void)
 464 {
 465         int temp, i, buff[5];
 466
 467         for (i=0; i<5; i++) {
 468                 buff[i] = sharpsl_pm.machinfo->read_devdata(SHARPSL_ACIN_VOLT);
 469                 mdelay(SHARPSL_CHECK_BATTERY_WAIT_TIME_ACIN);
 470         }
 471
 472         temp = get_select_val(buff);
 473         dev_dbg(sharpsl_pm.dev, "AC Voltage: %d\n",temp);
 474
 475         if ((temp > sharpsl_pm.machinfo->charge_acin_high) || (temp < sharpsl_pm.machinfo->charge_acin_low)) {
 476                 dev_err(sharpsl_pm.dev, "Error: AC check failed.\n");
 477                 return -1;
 478         }
 479
 480         return 0;
 481 }
 482
 483 #ifdef CONFIG_PM
 484 static int sharpsl_pm_suspend(struct platform_device *pdev, pm_message_t state)
 485 {
 486         sharpsl_pm.flags |= SHARPSL_SUSPENDED;
 487         flush_scheduled_work();
 488
 489         if (sharpsl_pm.charge_mode == CHRG_ON)
 490                 sharpsl_pm.flags |= SHARPSL_DO_OFFLINE_CHRG;
 491         else
 492                 sharpsl_pm.flags &= ~SHARPSL_DO_OFFLINE_CHRG;
 493
 494         return 0;
 495 }
 496
 497 static int sharpsl_pm_resume(struct platform_device *pdev)
 498 {
 499         /* Clear the reset source indicators as they break the bootloader upon reboot */
 500         RCSR = 0x0f;
 501         sharpsl_average_clear();
 502         sharpsl_pm.flags &= ~SHARPSL_APM_QUEUED;
 503         sharpsl_pm.flags &= ~SHARPSL_SUSPENDED;
 504
 505         return 0;
 506 }
 507
 508 static void corgi_goto_sleep(unsigned long alarm_time, unsigned int alarm_enable, suspend_state_t state)
 509 {
 510         dev_dbg(sharpsl_pm.dev, "Time is: %08x\n",RCNR);
 511
 512         dev_dbg(sharpsl_pm.dev, "Offline Charge Activate = %d\n",sharpsl_pm.flags & SHARPSL_DO_OFFLINE_CHRG);
 513         /* not charging and AC-IN! */
 514
 515         if ((sharpsl_pm.flags & SHARPSL_DO_OFFLINE_CHRG) && (sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN))) {
 516                 dev_dbg(sharpsl_pm.dev, "Activating Offline Charger...\n");
 517                 sharpsl_pm.charge_mode = CHRG_OFF;
 518                 sharpsl_pm.flags &= ~SHARPSL_DO_OFFLINE_CHRG;
 519                 sharpsl_off_charge_battery();
 520         }
 521
 522         sharpsl_pm.machinfo->presuspend();
 523
 524         PEDR = 0xffffffff; /* clear it */
 525
 526         sharpsl_pm.flags &= ~SHARPSL_ALARM_ACTIVE;
 527         if ((sharpsl_pm.charge_mode == CHRG_ON) && ((alarm_enable && ((alarm_time - RCNR) > (SHARPSL_BATCHK_TIME_SUSPEND + 30))) || !alarm_enable)) {
 528                 RTSR &= RTSR_ALE;
 529                 RTAR = RCNR + SHARPSL_BATCHK_TIME_SUSPEND;
 530                 dev_dbg(sharpsl_pm.dev, "Charging alarm at: %08x\n",RTAR);
 531                 sharpsl_pm.flags |= SHARPSL_ALARM_ACTIVE;
 532         } else if (alarm_enable) {
 533                 RTSR &= RTSR_ALE;
 534                 RTAR = alarm_time;
 535                 dev_dbg(sharpsl_pm.dev, "User alarm at: %08x\n",RTAR);
 536         } else {
 537                 dev_dbg(sharpsl_pm.dev, "No alarms set.\n");
 538         }
 539
 540         pxa_pm_enter(state);
 541
 542         sharpsl_pm.machinfo->postsuspend();
 543
 544         dev_dbg(sharpsl_pm.dev, "Corgi woken up from suspend: %08x\n",PEDR);
 545 }
 546
 547 static int corgi_enter_suspend(unsigned long alarm_time, unsigned int alarm_enable, suspend_state_t state)
 548 {
 549         if (!sharpsl_pm.machinfo->should_wakeup(!(sharpsl_pm.flags & SHARPSL_ALARM_ACTIVE) && alarm_enable) )
 550         {
 551                 if (!(sharpsl_pm.flags & SHARPSL_ALARM_ACTIVE)) {
 552                         dev_dbg(sharpsl_pm.dev, "No user triggered wakeup events and not charging. Strange. Suspend.\n");
 553                         corgi_goto_sleep(alarm_time, alarm_enable, state);
 554                         return 1;
 555                 }
 556                 if(sharpsl_off_charge_battery()) {
 557                         dev_dbg(sharpsl_pm.dev, "Charging. Suspend...\n");
 558                         corgi_goto_sleep(alarm_time, alarm_enable, state);
 559                         return 1;
 560                 }
 561                 dev_dbg(sharpsl_pm.dev, "User triggered wakeup in offline charger.\n");
 562         }
 563
 564         if ((!sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_LOCK)) || (sharpsl_fatal_check() < 0) )
 565         {
 566                 dev_err(sharpsl_pm.dev, "Fatal condition. Suspend.\n");
 567                 corgi_goto_sleep(alarm_time, alarm_enable, state);
 568                 return 1;
 569         }
 570
 571         return 0;
 572 }
 573
 574 static int corgi_pxa_pm_enter(suspend_state_t state)
 575 {
 576         unsigned long alarm_time = RTAR;
 577         unsigned int alarm_status = ((RTSR & RTSR_ALE) != 0);
 578
 579         dev_dbg(sharpsl_pm.dev, "SharpSL suspending for first time.\n");
 580
 581         corgi_goto_sleep(alarm_time, alarm_status, state);
 582
 583         while (corgi_enter_suspend(alarm_time,alarm_status,state))
 584                 {}
 585
 586         if (sharpsl_pm.machinfo->earlyresume)
 587                 sharpsl_pm.machinfo->earlyresume();
 588
 589         dev_dbg(sharpsl_pm.dev, "SharpSL resuming...\n");
 590
 591         return 0;
 592 }
 593
 594 /*
 595  * Check for fatal battery errors
 596  * Fatal returns -1
 597  */
 598 static int sharpsl_fatal_check(void)
 599 {
 600         int buff[5], temp, i, acin;
 601
 602         dev_dbg(sharpsl_pm.dev, "sharpsl_fatal_check entered\n");
 603
 604         /* Check AC-Adapter */
 605         acin = sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN);
 606
 607         if (acin && (sharpsl_pm.charge_mode == CHRG_ON)) {
 608                 sharpsl_pm.machinfo->charge(0);
 609                 udelay(100);
 610                 sharpsl_pm.machinfo->discharge(1);      /* enable discharge */
 611                 mdelay(SHARPSL_WAIT_DISCHARGE_ON);
 612         }
 613
 614         if (sharpsl_pm.machinfo->discharge1)
 615                 sharpsl_pm.machinfo->discharge1(1);
 616
 617         /* Check battery : check inserting battery ? */
 618         for (i=0; i<5; i++) {
 619                 buff[i] = sharpsl_pm.machinfo->read_devdata(SHARPSL_BATT_VOLT);
 620                 mdelay(SHARPSL_CHECK_BATTERY_WAIT_TIME_VOLT);
 621         }
 622
 623         if (sharpsl_pm.machinfo->discharge1)
 624                 sharpsl_pm.machinfo->discharge1(0);
 625
 626         if (acin && (sharpsl_pm.charge_mode == CHRG_ON)) {
 627                 udelay(100);
 628                 sharpsl_pm.machinfo->charge(1);
 629                 sharpsl_pm.machinfo->discharge(0);
 630         }
 631
 632         temp = get_select_val(buff);
 633         dev_dbg(sharpsl_pm.dev, "sharpsl_fatal_check: acin: %d, discharge voltage: %d, no discharge: %ld\n", acin, temp, sharpsl_pm.machinfo->read_devdata(SHARPSL_BATT_VOLT));
 634
 635         if ((acin && (temp < sharpsl_pm.machinfo->fatal_acin_volt)) ||
 636                         (!acin && (temp < sharpsl_pm.machinfo->fatal_noacin_volt)))
 637                 return -1;
 638         return 0;
 639 }
 640
 641 static int sharpsl_off_charge_error(void)
 642 {
 643         dev_err(sharpsl_pm.dev, "Offline Charger: Error occurred.\n");
 644         sharpsl_pm.machinfo->charge(0);
 645         sharpsl_pm_led(SHARPSL_LED_ERROR);
 646         sharpsl_pm.charge_mode = CHRG_ERROR;
 647         return 1;
 648 }
 649
 650 /*
 651  * Charging Control while suspended
 652  * Return 1 - go straight to sleep
 653  * Return 0 - sleep or wakeup depending on other factors
 654  */
 655 static int sharpsl_off_charge_battery(void)
 656 {
 657         int time;
 658
 659         dev_dbg(sharpsl_pm.dev, "Charge Mode: %d\n", sharpsl_pm.charge_mode);
 660
 661         if (sharpsl_pm.charge_mode == CHRG_OFF) {
 662                 dev_dbg(sharpsl_pm.dev, "Offline Charger: Step 1\n");
 663
 664                 /* AC Check */
 665                 if ((sharpsl_ac_check() < 0) || (sharpsl_check_battery_temp() < 0))
 666                         return sharpsl_off_charge_error();
 667
 668                 /* Start Charging */
 669                 sharpsl_pm_led(SHARPSL_LED_ON);
 670                 sharpsl_pm.machinfo->charge(0);
 671                 mdelay(SHARPSL_CHARGE_WAIT_TIME);
 672                 sharpsl_pm.machinfo->charge(1);
 673
 674                 sharpsl_pm.charge_mode = CHRG_ON;
 675                 sharpsl_pm.full_count = 0;
 676
 677                 return 1;
 678         } else if (sharpsl_pm.charge_mode != CHRG_ON) {
 679                 return 1;
 680         }
 681
 682         if (sharpsl_pm.full_count == 0) {
 683                 int time;
 684
 685                 dev_dbg(sharpsl_pm.dev, "Offline Charger: Step 2\n");
 686
 687                 if ((sharpsl_check_battery_temp() < 0) || (sharpsl_check_battery_voltage() < 0))
 688                         return sharpsl_off_charge_error();
 689
 690                 sharpsl_pm.machinfo->charge(0);
 691                 mdelay(SHARPSL_CHARGE_WAIT_TIME);
 692                 sharpsl_pm.machinfo->charge(1);
 693                 sharpsl_pm.charge_mode = CHRG_ON;
 694
 695                 mdelay(SHARPSL_CHARGE_CO_CHECK_TIME);
 696
 697                 time = RCNR;
 698                 while(1) {
 699                         /* Check if any wakeup event had occurred */
 700                         if (sharpsl_pm.machinfo->charger_wakeup() != 0)
 701                                 return 0;
 702                         /* Check for timeout */
 703                         if ((RCNR - time) > SHARPSL_WAIT_CO_TIME)
 704                                 return 1;
 705                         if (sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_CHRGFULL)) {
 706                                 dev_dbg(sharpsl_pm.dev, "Offline Charger: Charge full occurred. Retrying to check\n");
 707                                 sharpsl_pm.full_count++;
 708                                 sharpsl_pm.machinfo->charge(0);
 709                                 mdelay(SHARPSL_CHARGE_WAIT_TIME);
 710                                 sharpsl_pm.machinfo->charge(1);
 711                                 return 1;
 712                         }
 713                 }
 714         }
 715
 716         dev_dbg(sharpsl_pm.dev, "Offline Charger: Step 3\n");
 717
 718         mdelay(SHARPSL_CHARGE_CO_CHECK_TIME);
 719
 720         time = RCNR;
 721         while(1) {
 722                 /* Check if any wakeup event had occurred */
 723                 if (sharpsl_pm.machinfo->charger_wakeup() != 0)
 724                         return 0;
 725                 /* Check for timeout */
 726                 if ((RCNR-time) > SHARPSL_WAIT_CO_TIME) {
 727                         if (sharpsl_pm.full_count > SHARPSL_CHARGE_RETRY_CNT) {
 728                                 dev_dbg(sharpsl_pm.dev, "Offline Charger: Not charged sufficiently. Retrying.\n");
 729                                 sharpsl_pm.full_count = 0;
 730                         }
 731                         sharpsl_pm.full_count++;
 732                         return 1;
 733                 }
 734                 if (sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_CHRGFULL)) {
 735                         dev_dbg(sharpsl_pm.dev, "Offline Charger: Charging complete.\n");
 736                         sharpsl_pm_led(SHARPSL_LED_OFF);
 737                         sharpsl_pm.machinfo->charge(0);
 738                         sharpsl_pm.charge_mode = CHRG_DONE;
 739                         return 1;
 740                 }
 741         }
 742 }
 743 #else
 744 #define sharpsl_pm_suspend      NULL
 745 #define sharpsl_pm_resume       NULL
 746 #endif
 747
 748 static ssize_t battery_percentage_show(struct device *dev, struct device_attribute *attr, char *buf)
 749 {
 750         return sprintf(buf, "%d\n",sharpsl_pm.battstat.mainbat_percent);
 751 }
 752
 753 static ssize_t battery_voltage_show(struct device *dev, struct device_attribute *attr, char *buf)
 754 {
 755         return sprintf(buf, "%d\n",sharpsl_pm.battstat.mainbat_voltage);
 756 }
 757
 758 static DEVICE_ATTR(battery_percentage, 0444, battery_percentage_show, NULL);
 759 static DEVICE_ATTR(battery_voltage, 0444, battery_voltage_show, NULL);
 760
 761 extern void (*apm_get_power_status)(struct apm_power_info *);
 762
 763 static void sharpsl_apm_get_power_status(struct apm_power_info *info)
 764 {
 765         info->ac_line_status = sharpsl_pm.battstat.ac_status;
 766
 767         if (sharpsl_pm.charge_mode == CHRG_ON)
 768                 info->battery_status = APM_BATTERY_STATUS_CHARGING;
 769         else
 770                 info->battery_status = sharpsl_pm.battstat.mainbat_status;
 771
 772         info->battery_flag = (1 << info->battery_status);
 773         info->battery_life = sharpsl_pm.battstat.mainbat_percent;
 774 }
 775
 776 #ifdef CONFIG_PM
 777 static struct platform_suspend_ops sharpsl_pm_ops = {
 778         .enter          = corgi_pxa_pm_enter,
 779         .valid          = suspend_valid_only_mem,
 780 };
 781 #endif
 782
 783 static int __init sharpsl_pm_probe(struct platform_device *pdev)
 784 {
 785         int ret;
 786
 787         if (!pdev->dev.platform_data)
 788                 return -EINVAL;
 789
 790         sharpsl_pm.dev = &pdev->dev;
 791         sharpsl_pm.machinfo = pdev->dev.platform_data;
 792         sharpsl_pm.charge_mode = CHRG_OFF;
 793         sharpsl_pm.flags = 0;
 794
 795         init_timer(&sharpsl_pm.ac_timer);
 796         sharpsl_pm.ac_timer.function = sharpsl_ac_timer;
 797
 798         init_timer(&sharpsl_pm.chrg_full_timer);
 799         sharpsl_pm.chrg_full_timer.function = sharpsl_chrg_full_timer;
 800
 801         led_trigger_register_simple("sharpsl-charge", &sharpsl_charge_led_trigger);
 802
 803         sharpsl_pm.machinfo->init();
 804
 805         ret = device_create_file(&pdev->dev, &dev_attr_battery_percentage);
 806         ret |= device_create_file(&pdev->dev, &dev_attr_battery_voltage);
 807         if (ret != 0)
 808                 dev_warn(&pdev->dev, "Failed to register attributes (%d)\n", ret);
 809
 810         apm_get_power_status = sharpsl_apm_get_power_status;
 811
 812 #ifdef CONFIG_PM
 813         suspend_set_ops(&sharpsl_pm_ops);
 814 #endif
 815
 816         mod_timer(&sharpsl_pm.ac_timer, jiffies + msecs_to_jiffies(250));
 817
 818         return 0;
 819 }
 820
 821 static int sharpsl_pm_remove(struct platform_device *pdev)
 822 {
 823         suspend_set_ops(NULL);
 824
 825         device_remove_file(&pdev->dev, &dev_attr_battery_percentage);
 826         device_remove_file(&pdev->dev, &dev_attr_battery_voltage);
 827
 828         led_trigger_unregister_simple(sharpsl_charge_led_trigger);
 829
 830         sharpsl_pm.machinfo->exit();
 831
 832         del_timer_sync(&sharpsl_pm.chrg_full_timer);
 833         del_timer_sync(&sharpsl_pm.ac_timer);
 834
 835         return 0;
 836 }
 837
 838 static struct platform_driver sharpsl_pm_driver = {
 839         .probe          = sharpsl_pm_probe,
 840         .remove         = sharpsl_pm_remove,
 841         .suspend        = sharpsl_pm_suspend,
 842         .resume         = sharpsl_pm_resume,
 843         .driver         = {
 844                 .name           = "sharpsl-pm",
 845         },
 846 };
 847
 848 static int __devinit sharpsl_pm_init(void)
 849 {
 850         return platform_driver_register(&sharpsl_pm_driver);
 851 }
 852
 853 static void sharpsl_pm_exit(void)
 854 {
 855         platform_driver_unregister(&sharpsl_pm_driver);
 856 }
 857
 858 late_initcall(sharpsl_pm_init);
 859 module_exit(sharpsl_pm_exit);