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