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