Merge master.kernel.org:/home/rmk/linux-2.6-arm
[linux-2.6.git] / 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 #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);