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Linux/arch/arm/mach-pxa/sharpsl_pm.c

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Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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/kernel.h>
 19 #include <linux/interrupt.h>
 20 #include <linux/platform_device.h>
 21 #include <linux/apm-emulation.h>
 22 #include <linux/timer.h>
 23 #include <linux/delay.h>
 24 #include <linux/leds.h>
 25 #include <linux/suspend.h>
 26 #include <linux/gpio.h>
 27 #include <linux/io.h>
 28 
 29 #include <asm/mach-types.h>
 30 #include "pm.h"
 31 #include <mach/pxa2xx-regs.h>
 32 #include "regs-rtc.h"
 33 #include "sharpsl_pm.h"
 34 
 35 /*
 36  * Constants
 37  */
 38 #define SHARPSL_CHARGE_ON_TIME_INTERVAL        (msecs_to_jiffies(1*60*1000))  /* 1 min */
 39 #define SHARPSL_CHARGE_FINISH_TIME             (msecs_to_jiffies(10*60*1000)) /* 10 min */
 40 #define SHARPSL_BATCHK_TIME                    (msecs_to_jiffies(15*1000))    /* 15 sec */
 41 #define SHARPSL_BATCHK_TIME_SUSPEND            (60*10)                        /* 10 min */
 42 
 43 #define SHARPSL_WAIT_CO_TIME                   15  /* 15 sec */
 44 #define SHARPSL_WAIT_DISCHARGE_ON              100 /* 100 msec */
 45 #define SHARPSL_CHECK_BATTERY_WAIT_TIME_TEMP   10  /* 10 msec */
 46 #define SHARPSL_CHECK_BATTERY_WAIT_TIME_VOLT   10  /* 10 msec */
 47 #define SHARPSL_CHECK_BATTERY_WAIT_TIME_ACIN   10  /* 10 msec */
 48 #define SHARPSL_CHARGE_WAIT_TIME               15  /* 15 msec */
 49 #define SHARPSL_CHARGE_CO_CHECK_TIME           5   /* 5 msec */
 50 #define SHARPSL_CHARGE_RETRY_CNT               1   /* eqv. 10 min */
 51 
 52 /*
 53  * Prototypes
 54  */
 55 #ifdef CONFIG_PM
 56 static int sharpsl_off_charge_battery(void);
 57 static int sharpsl_check_battery_voltage(void);
 58 #endif
 59 static int sharpsl_check_battery_temp(void);
 60 static int sharpsl_ac_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 static DECLARE_DELAYED_WORK(toggle_charger, sharpsl_charge_toggle);
 72 static DECLARE_DELAYED_WORK(sharpsl_bat, sharpsl_battery_thread);
 73 DEFINE_LED_TRIGGER(sharpsl_charge_led_trigger);
 74 
 75 
 76 
 77 struct battery_thresh sharpsl_battery_levels_acin[] = {
 78         { 213, 100},
 79         { 212,  98},
 80         { 211,  95},
 81         { 210,  93},
 82         { 209,  90},
 83         { 208,  88},
 84         { 207,  85},
 85         { 206,  83},
 86         { 205,  80},
 87         { 204,  78},
 88         { 203,  75},
 89         { 202,  73},
 90         { 201,  70},
 91         { 200,  68},
 92         { 199,  65},
 93         { 198,  63},
 94         { 197,  60},
 95         { 196,  58},
 96         { 195,  55},
 97         { 194,  53},
 98         { 193,  50},
 99         { 192,  48},
100         { 192,  45},
101         { 191,  43},
102         { 191,  40},
103         { 190,  38},
104         { 190,  35},
105         { 189,  33},
106         { 188,  30},
107         { 187,  28},
108         { 186,  25},
109         { 185,  23},
110         { 184,  20},
111         { 183,  18},
112         { 182,  15},
113         { 181,  13},
114         { 180,  10},
115         { 179,   8},
116         { 178,   5},
117         {   0,   0},
118 };
119 
120 struct battery_thresh sharpsl_battery_levels_noac[] = {
121         { 213, 100},
122         { 212,  98},
123         { 211,  95},
124         { 210,  93},
125         { 209,  90},
126         { 208,  88},
127         { 207,  85},
128         { 206,  83},
129         { 205,  80},
130         { 204,  78},
131         { 203,  75},
132         { 202,  73},
133         { 201,  70},
134         { 200,  68},
135         { 199,  65},
136         { 198,  63},
137         { 197,  60},
138         { 196,  58},
139         { 195,  55},
140         { 194,  53},
141         { 193,  50},
142         { 192,  48},
143         { 191,  45},
144         { 190,  43},
145         { 189,  40},
146         { 188,  38},
147         { 187,  35},
148         { 186,  33},
149         { 185,  30},
150         { 184,  28},
151         { 183,  25},
152         { 182,  23},
153         { 181,  20},
154         { 180,  18},
155         { 179,  15},
156         { 178,  13},
157         { 177,  10},
158         { 176,   8},
159         { 175,   5},
160         {   0,   0},
161 };
162 
163 /* MAX1111 Commands */
164 #define MAXCTRL_PD0      (1u << 0)
165 #define MAXCTRL_PD1      (1u << 1)
166 #define MAXCTRL_SGL      (1u << 2)
167 #define MAXCTRL_UNI      (1u << 3)
168 #define MAXCTRL_SEL_SH   4
169 #define MAXCTRL_STR      (1u << 7)
170 
171 extern int max1111_read_channel(int);
172 /*
173  * Read MAX1111 ADC
174  */
175 int sharpsl_pm_pxa_read_max1111(int channel)
176 {
177         /* Ugly, better move this function into another module */
178         if (machine_is_tosa())
179             return 0;
180 
181         /* max1111 accepts channels from 0-3, however,
182          * it is encoded from 0-7 here in the code.
183          */
184         return max1111_read_channel(channel >> 1);
185 }
186 
187 static int get_percentage(int voltage)
188 {
189         int i = sharpsl_pm.machinfo->bat_levels - 1;
190         int bl_status = sharpsl_pm.machinfo->backlight_get_status ? sharpsl_pm.machinfo->backlight_get_status() : 0;
191         struct battery_thresh *thresh;
192 
193         if (sharpsl_pm.charge_mode == CHRG_ON)
194                 thresh = bl_status ? sharpsl_pm.machinfo->bat_levels_acin_bl : sharpsl_pm.machinfo->bat_levels_acin;
195         else
196                 thresh = bl_status ? sharpsl_pm.machinfo->bat_levels_noac_bl : sharpsl_pm.machinfo->bat_levels_noac;
197 
198         while (i > 0 && (voltage > thresh[i].voltage))
199                 i--;
200 
201         return thresh[i].percentage;
202 }
203 
204 static int get_apm_status(int voltage)
205 {
206         int low_thresh, high_thresh;
207 
208         if (sharpsl_pm.charge_mode == CHRG_ON) {
209                 high_thresh = sharpsl_pm.machinfo->status_high_acin;
210                 low_thresh = sharpsl_pm.machinfo->status_low_acin;
211         } else {
212                 high_thresh = sharpsl_pm.machinfo->status_high_noac;
213                 low_thresh = sharpsl_pm.machinfo->status_low_noac;
214         }
215 
216         if (voltage >= high_thresh)
217                 return APM_BATTERY_STATUS_HIGH;
218         if (voltage >= low_thresh)
219                 return APM_BATTERY_STATUS_LOW;
220         return APM_BATTERY_STATUS_CRITICAL;
221 }
222 
223 void sharpsl_battery_kick(void)
224 {
225         schedule_delayed_work(&sharpsl_bat, msecs_to_jiffies(125));
226 }
227 EXPORT_SYMBOL(sharpsl_battery_kick);
228 
229 
230 static void sharpsl_battery_thread(struct work_struct *private_)
231 {
232         int voltage, percent, apm_status, i;
233 
234         if (!sharpsl_pm.machinfo)
235                 return;
236 
237         sharpsl_pm.battstat.ac_status = (sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN) ? APM_AC_ONLINE : APM_AC_OFFLINE);
238 
239         /* Corgi cannot confirm when battery fully charged so periodically kick! */
240         if (!sharpsl_pm.machinfo->batfull_irq && (sharpsl_pm.charge_mode == CHRG_ON)
241                         && time_after(jiffies, sharpsl_pm.charge_start_time +  SHARPSL_CHARGE_ON_TIME_INTERVAL))
242                 schedule_delayed_work(&toggle_charger, 0);
243 
244         for (i = 0; i < 5; i++) {
245                 voltage = sharpsl_pm.machinfo->read_devdata(SHARPSL_BATT_VOLT);
246                 if (voltage > 0)
247                         break;
248         }
249         if (voltage <= 0) {
250                 voltage = sharpsl_pm.machinfo->bat_levels_noac[0].voltage;
251                 dev_warn(sharpsl_pm.dev, "Warning: Cannot read main battery!\n");
252         }
253 
254         voltage = sharpsl_average_value(voltage);
255         apm_status = get_apm_status(voltage);
256         percent = get_percentage(voltage);
257 
258         /* At low battery voltages, the voltage has a tendency to start
259            creeping back up so we try to avoid this here */
260         if ((sharpsl_pm.battstat.ac_status == APM_AC_ONLINE)
261             || (apm_status == APM_BATTERY_STATUS_HIGH)
262             || percent <= sharpsl_pm.battstat.mainbat_percent) {
263                 sharpsl_pm.battstat.mainbat_voltage = voltage;
264                 sharpsl_pm.battstat.mainbat_status = apm_status;
265                 sharpsl_pm.battstat.mainbat_percent = percent;
266         }
267 
268         dev_dbg(sharpsl_pm.dev, "Battery: voltage: %d, status: %d, percentage: %d, time: %ld\n", voltage,
269                         sharpsl_pm.battstat.mainbat_status, sharpsl_pm.battstat.mainbat_percent, jiffies);
270 
271         /* Suspend if critical battery level */
272         if ((sharpsl_pm.battstat.ac_status != APM_AC_ONLINE)
273              && (sharpsl_pm.battstat.mainbat_status == APM_BATTERY_STATUS_CRITICAL)
274              && !(sharpsl_pm.flags & SHARPSL_APM_QUEUED)) {
275                 sharpsl_pm.flags |= SHARPSL_APM_QUEUED;
276                 dev_err(sharpsl_pm.dev, "Fatal Off\n");
277                 apm_queue_event(APM_CRITICAL_SUSPEND);
278         }
279 
280         schedule_delayed_work(&sharpsl_bat, SHARPSL_BATCHK_TIME);
281 }
282 
283 void sharpsl_pm_led(int val)
284 {
285         if (val == SHARPSL_LED_ERROR) {
286                 dev_err(sharpsl_pm.dev, "Charging Error!\n");
287         } else if (val == SHARPSL_LED_ON) {
288                 dev_dbg(sharpsl_pm.dev, "Charge LED On\n");
289                 led_trigger_event(sharpsl_charge_led_trigger, LED_FULL);
290         } else {
291                 dev_dbg(sharpsl_pm.dev, "Charge LED Off\n");
292                 led_trigger_event(sharpsl_charge_led_trigger, LED_OFF);
293         }
294 }
295 
296 static void sharpsl_charge_on(void)
297 {
298         dev_dbg(sharpsl_pm.dev, "Turning Charger On\n");
299 
300         sharpsl_pm.full_count = 0;
301         sharpsl_pm.charge_mode = CHRG_ON;
302         schedule_delayed_work(&toggle_charger, msecs_to_jiffies(250));
303         schedule_delayed_work(&sharpsl_bat, msecs_to_jiffies(500));
304 }
305 
306 static void sharpsl_charge_off(void)
307 {
308         dev_dbg(sharpsl_pm.dev, "Turning Charger Off\n");
309 
310         sharpsl_pm.machinfo->charge(0);
311         sharpsl_pm_led(SHARPSL_LED_OFF);
312         sharpsl_pm.charge_mode = CHRG_OFF;
313 
314         schedule_delayed_work(&sharpsl_bat, 0);
315 }
316 
317 static void sharpsl_charge_error(void)
318 {
319         sharpsl_pm_led(SHARPSL_LED_ERROR);
320         sharpsl_pm.machinfo->charge(0);
321         sharpsl_pm.charge_mode = CHRG_ERROR;
322 }
323 
324 static void sharpsl_charge_toggle(struct work_struct *private_)
325 {
326         dev_dbg(sharpsl_pm.dev, "Toggling Charger at time: %lx\n", jiffies);
327 
328         if (!sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN)) {
329                 sharpsl_charge_off();
330                 return;
331         } else if ((sharpsl_check_battery_temp() < 0) || (sharpsl_ac_check() < 0)) {
332                 sharpsl_charge_error();
333                 return;
334         }
335 
336         sharpsl_pm_led(SHARPSL_LED_ON);
337         sharpsl_pm.machinfo->charge(0);
338         mdelay(SHARPSL_CHARGE_WAIT_TIME);
339         sharpsl_pm.machinfo->charge(1);
340 
341         sharpsl_pm.charge_start_time = jiffies;
342 }
343 
344 static void sharpsl_ac_timer(struct timer_list *unused)
345 {
346         int acin = sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN);
347 
348         dev_dbg(sharpsl_pm.dev, "AC Status: %d\n", acin);
349 
350         sharpsl_average_clear();
351         if (acin && (sharpsl_pm.charge_mode != CHRG_ON))
352                 sharpsl_charge_on();
353         else if (sharpsl_pm.charge_mode == CHRG_ON)
354                 sharpsl_charge_off();
355 
356         schedule_delayed_work(&sharpsl_bat, 0);
357 }
358 
359 
360 static irqreturn_t sharpsl_ac_isr(int irq, void *dev_id)
361 {
362         /* Delay the event slightly to debounce */
363         /* Must be a smaller delay than the chrg_full_isr below */
364         mod_timer(&sharpsl_pm.ac_timer, jiffies + msecs_to_jiffies(250));
365 
366         return IRQ_HANDLED;
367 }
368 
369 static void sharpsl_chrg_full_timer(struct timer_list *unused)
370 {
371         dev_dbg(sharpsl_pm.dev, "Charge Full at time: %lx\n", jiffies);
372 
373         sharpsl_pm.full_count++;
374 
375         if (!sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN)) {
376                 dev_dbg(sharpsl_pm.dev, "Charge Full: AC removed - stop charging!\n");
377                 if (sharpsl_pm.charge_mode == CHRG_ON)
378                         sharpsl_charge_off();
379         } else if (sharpsl_pm.full_count < 2) {
380                 dev_dbg(sharpsl_pm.dev, "Charge Full: Count too low\n");
381                 schedule_delayed_work(&toggle_charger, 0);
382         } else if (time_after(jiffies, sharpsl_pm.charge_start_time + SHARPSL_CHARGE_FINISH_TIME)) {
383                 dev_dbg(sharpsl_pm.dev, "Charge Full: Interrupt generated too slowly - retry.\n");
384                 schedule_delayed_work(&toggle_charger, 0);
385         } else {
386                 sharpsl_charge_off();
387                 sharpsl_pm.charge_mode = CHRG_DONE;
388                 dev_dbg(sharpsl_pm.dev, "Charge Full: Charging Finished\n");
389         }
390 }
391 
392 /* Charging Finished Interrupt (Not present on Corgi) */
393 /* Can trigger at the same time as an AC status change so
394    delay until after that has been processed */
395 static irqreturn_t sharpsl_chrg_full_isr(int irq, void *dev_id)
396 {
397         if (sharpsl_pm.flags & SHARPSL_SUSPENDED)
398                 return IRQ_HANDLED;
399 
400         /* delay until after any ac interrupt */
401         mod_timer(&sharpsl_pm.chrg_full_timer, jiffies + msecs_to_jiffies(500));
402 
403         return IRQ_HANDLED;
404 }
405 
406 static irqreturn_t sharpsl_fatal_isr(int irq, void *dev_id)
407 {
408         int is_fatal = 0;
409 
410         if (!sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_LOCK)) {
411                 dev_err(sharpsl_pm.dev, "Battery now Unlocked! Suspending.\n");
412                 is_fatal = 1;
413         }
414 
415         if (!sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_FATAL)) {
416                 dev_err(sharpsl_pm.dev, "Fatal Batt Error! Suspending.\n");
417                 is_fatal = 1;
418         }
419 
420         if (!(sharpsl_pm.flags & SHARPSL_APM_QUEUED) && is_fatal) {
421                 sharpsl_pm.flags |= SHARPSL_APM_QUEUED;
422                 apm_queue_event(APM_CRITICAL_SUSPEND);
423         }
424 
425         return IRQ_HANDLED;
426 }
427 
428 /*
429  * Maintain an average of the last 10 readings
430  */
431 #define SHARPSL_CNV_VALUE_NUM    10
432 static int sharpsl_ad_index;
433 
434 static void sharpsl_average_clear(void)
435 {
436         sharpsl_ad_index = 0;
437 }
438 
439 static int sharpsl_average_value(int ad)
440 {
441         int i, ad_val = 0;
442         static int sharpsl_ad[SHARPSL_CNV_VALUE_NUM+1];
443 
444         if (sharpsl_pm.battstat.mainbat_status != APM_BATTERY_STATUS_HIGH) {
445                 sharpsl_ad_index = 0;
446                 return ad;
447         }
448 
449         sharpsl_ad[sharpsl_ad_index] = ad;
450         sharpsl_ad_index++;
451         if (sharpsl_ad_index >= SHARPSL_CNV_VALUE_NUM) {
452                 for (i = 0; i < (SHARPSL_CNV_VALUE_NUM-1); i++)
453                         sharpsl_ad[i] = sharpsl_ad[i+1];
454                 sharpsl_ad_index = SHARPSL_CNV_VALUE_NUM - 1;
455         }
456         for (i = 0; i < sharpsl_ad_index; i++)
457                 ad_val += sharpsl_ad[i];
458 
459         return ad_val / sharpsl_ad_index;
460 }
461 
462 /*
463  * Take an array of 5 integers, remove the maximum and minimum values
464  * and return the average.
465  */
466 static int get_select_val(int *val)
467 {
468         int i, j, k, temp, sum = 0;
469 
470         /* Find MAX val */
471         temp = val[0];
472         j = 0;
473         for (i = 1; i < 5; i++) {
474                 if (temp < val[i]) {
475                         temp = val[i];
476                         j = i;
477                 }
478         }
479 
480         /* Find MIN val */
481         temp = val[4];
482         k = 4;
483         for (i = 3; i >= 0; i--) {
484                 if (temp > val[i]) {
485                         temp = val[i];
486                         k = i;
487                 }
488         }
489 
490         for (i = 0; i < 5; i++)
491                 if (i != j && i != k)
492                         sum += val[i];
493 
494         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]);
495 
496         return sum/3;
497 }
498 
499 static int sharpsl_check_battery_temp(void)
500 {
501         int val, i, buff[5];
502 
503         /* Check battery temperature */
504         for (i = 0; i < 5; i++) {
505                 mdelay(SHARPSL_CHECK_BATTERY_WAIT_TIME_TEMP);
506                 sharpsl_pm.machinfo->measure_temp(1);
507                 mdelay(SHARPSL_CHECK_BATTERY_WAIT_TIME_TEMP);
508                 buff[i] = sharpsl_pm.machinfo->read_devdata(SHARPSL_BATT_TEMP);
509                 sharpsl_pm.machinfo->measure_temp(0);
510         }
511 
512         val = get_select_val(buff);
513 
514         dev_dbg(sharpsl_pm.dev, "Temperature: %d\n", val);
515         if (val > sharpsl_pm.machinfo->charge_on_temp) {
516                 printk(KERN_WARNING "Not charging: temperature out of limits.\n");
517                 return -1;
518         }
519 
520         return 0;
521 }
522 
523 #ifdef CONFIG_PM
524 static int sharpsl_check_battery_voltage(void)
525 {
526         int val, i, buff[5];
527 
528         /* disable charge, enable discharge */
529         sharpsl_pm.machinfo->charge(0);
530         sharpsl_pm.machinfo->discharge(1);
531         mdelay(SHARPSL_WAIT_DISCHARGE_ON);
532 
533         if (sharpsl_pm.machinfo->discharge1)
534                 sharpsl_pm.machinfo->discharge1(1);
535 
536         /* Check battery voltage */
537         for (i = 0; i < 5; i++) {
538                 buff[i] = sharpsl_pm.machinfo->read_devdata(SHARPSL_BATT_VOLT);
539                 mdelay(SHARPSL_CHECK_BATTERY_WAIT_TIME_VOLT);
540         }
541 
542         if (sharpsl_pm.machinfo->discharge1)
543                 sharpsl_pm.machinfo->discharge1(0);
544 
545         sharpsl_pm.machinfo->discharge(0);
546 
547         val = get_select_val(buff);
548         dev_dbg(sharpsl_pm.dev, "Battery Voltage: %d\n", val);
549 
550         if (val < sharpsl_pm.machinfo->charge_on_volt)
551                 return -1;
552 
553         return 0;
554 }
555 #endif
556 
557 static int sharpsl_ac_check(void)
558 {
559         int temp, i, buff[5];
560 
561         for (i = 0; i < 5; i++) {
562                 buff[i] = sharpsl_pm.machinfo->read_devdata(SHARPSL_ACIN_VOLT);
563                 mdelay(SHARPSL_CHECK_BATTERY_WAIT_TIME_ACIN);
564         }
565 
566         temp = get_select_val(buff);
567         dev_dbg(sharpsl_pm.dev, "AC Voltage: %d\n", temp);
568 
569         if ((temp > sharpsl_pm.machinfo->charge_acin_high) || (temp < sharpsl_pm.machinfo->charge_acin_low)) {
570                 dev_err(sharpsl_pm.dev, "Error: AC check failed: voltage %d.\n", temp);
571                 return -1;
572         }
573 
574         return 0;
575 }
576 
577 #ifdef CONFIG_PM
578 static int sharpsl_pm_suspend(struct platform_device *pdev, pm_message_t state)
579 {
580         sharpsl_pm.flags |= SHARPSL_SUSPENDED;
581         flush_delayed_work(&toggle_charger);
582         flush_delayed_work(&sharpsl_bat);
583 
584         if (sharpsl_pm.charge_mode == CHRG_ON)
585                 sharpsl_pm.flags |= SHARPSL_DO_OFFLINE_CHRG;
586         else
587                 sharpsl_pm.flags &= ~SHARPSL_DO_OFFLINE_CHRG;
588 
589         return 0;
590 }
591 
592 static int sharpsl_pm_resume(struct platform_device *pdev)
593 {
594         /* Clear the reset source indicators as they break the bootloader upon reboot */
595         RCSR = 0x0f;
596         sharpsl_average_clear();
597         sharpsl_pm.flags &= ~SHARPSL_APM_QUEUED;
598         sharpsl_pm.flags &= ~SHARPSL_SUSPENDED;
599 
600         return 0;
601 }
602 
603 static void corgi_goto_sleep(unsigned long alarm_time, unsigned int alarm_enable, suspend_state_t state)
604 {
605         dev_dbg(sharpsl_pm.dev, "Time is: %08x\n", RCNR);
606 
607         dev_dbg(sharpsl_pm.dev, "Offline Charge Activate = %d\n", sharpsl_pm.flags & SHARPSL_DO_OFFLINE_CHRG);
608         /* not charging and AC-IN! */
609 
610         if ((sharpsl_pm.flags & SHARPSL_DO_OFFLINE_CHRG) && (sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN))) {
611                 dev_dbg(sharpsl_pm.dev, "Activating Offline Charger...\n");
612                 sharpsl_pm.charge_mode = CHRG_OFF;
613                 sharpsl_pm.flags &= ~SHARPSL_DO_OFFLINE_CHRG;
614                 sharpsl_off_charge_battery();
615         }
616 
617         sharpsl_pm.machinfo->presuspend();
618 
619         PEDR = 0xffffffff; /* clear it */
620 
621         sharpsl_pm.flags &= ~SHARPSL_ALARM_ACTIVE;
622         if ((sharpsl_pm.charge_mode == CHRG_ON) && ((alarm_enable && ((alarm_time - RCNR) > (SHARPSL_BATCHK_TIME_SUSPEND + 30))) || !alarm_enable)) {
623                 RTSR &= RTSR_ALE;
624                 RTAR = RCNR + SHARPSL_BATCHK_TIME_SUSPEND;
625                 dev_dbg(sharpsl_pm.dev, "Charging alarm at: %08x\n", RTAR);
626                 sharpsl_pm.flags |= SHARPSL_ALARM_ACTIVE;
627         } else if (alarm_enable) {
628                 RTSR &= RTSR_ALE;
629                 RTAR = alarm_time;
630                 dev_dbg(sharpsl_pm.dev, "User alarm at: %08x\n", RTAR);
631         } else {
632                 dev_dbg(sharpsl_pm.dev, "No alarms set.\n");
633         }
634 
635         pxa_pm_enter(state);
636 
637         sharpsl_pm.machinfo->postsuspend();
638 
639         dev_dbg(sharpsl_pm.dev, "Corgi woken up from suspend: %08x\n", PEDR);
640 }
641 
642 static int corgi_enter_suspend(unsigned long alarm_time, unsigned int alarm_enable, suspend_state_t state)
643 {
644         if (!sharpsl_pm.machinfo->should_wakeup(!(sharpsl_pm.flags & SHARPSL_ALARM_ACTIVE) && alarm_enable)) {
645                 if (!(sharpsl_pm.flags & SHARPSL_ALARM_ACTIVE)) {
646                         dev_dbg(sharpsl_pm.dev, "No user triggered wakeup events and not charging. Strange. Suspend.\n");
647                         corgi_goto_sleep(alarm_time, alarm_enable, state);
648                         return 1;
649                 }
650                 if (sharpsl_off_charge_battery()) {
651                         dev_dbg(sharpsl_pm.dev, "Charging. Suspend...\n");
652                         corgi_goto_sleep(alarm_time, alarm_enable, state);
653                         return 1;
654                 }
655                 dev_dbg(sharpsl_pm.dev, "User triggered wakeup in offline charger.\n");
656         }
657 
658         if ((!sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_LOCK)) ||
659             (!sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_FATAL))) {
660                 dev_err(sharpsl_pm.dev, "Fatal condition. Suspend.\n");
661                 corgi_goto_sleep(alarm_time, alarm_enable, state);
662                 return 1;
663         }
664 
665         return 0;
666 }
667 
668 static int corgi_pxa_pm_enter(suspend_state_t state)
669 {
670         unsigned long alarm_time = RTAR;
671         unsigned int alarm_status = ((RTSR & RTSR_ALE) != 0);
672 
673         dev_dbg(sharpsl_pm.dev, "SharpSL suspending for first time.\n");
674 
675         corgi_goto_sleep(alarm_time, alarm_status, state);
676 
677         while (corgi_enter_suspend(alarm_time, alarm_status, state))
678                 {}
679 
680         if (sharpsl_pm.machinfo->earlyresume)
681                 sharpsl_pm.machinfo->earlyresume();
682 
683         dev_dbg(sharpsl_pm.dev, "SharpSL resuming...\n");
684 
685         return 0;
686 }
687 
688 static int sharpsl_off_charge_error(void)
689 {
690         dev_err(sharpsl_pm.dev, "Offline Charger: Error occurred.\n");
691         sharpsl_pm.machinfo->charge(0);
692         sharpsl_pm_led(SHARPSL_LED_ERROR);
693         sharpsl_pm.charge_mode = CHRG_ERROR;
694         return 1;
695 }
696 
697 /*
698  * Charging Control while suspended
699  * Return 1 - go straight to sleep
700  * Return 0 - sleep or wakeup depending on other factors
701  */
702 static int sharpsl_off_charge_battery(void)
703 {
704         int time;
705 
706         dev_dbg(sharpsl_pm.dev, "Charge Mode: %d\n", sharpsl_pm.charge_mode);
707 
708         if (sharpsl_pm.charge_mode == CHRG_OFF) {
709                 dev_dbg(sharpsl_pm.dev, "Offline Charger: Step 1\n");
710 
711                 /* AC Check */
712                 if ((sharpsl_ac_check() < 0) || (sharpsl_check_battery_temp() < 0))
713                         return sharpsl_off_charge_error();
714 
715                 /* Start Charging */
716                 sharpsl_pm_led(SHARPSL_LED_ON);
717                 sharpsl_pm.machinfo->charge(0);
718                 mdelay(SHARPSL_CHARGE_WAIT_TIME);
719                 sharpsl_pm.machinfo->charge(1);
720 
721                 sharpsl_pm.charge_mode = CHRG_ON;
722                 sharpsl_pm.full_count = 0;
723 
724                 return 1;
725         } else if (sharpsl_pm.charge_mode != CHRG_ON) {
726                 return 1;
727         }
728 
729         if (sharpsl_pm.full_count == 0) {
730                 int time;
731 
732                 dev_dbg(sharpsl_pm.dev, "Offline Charger: Step 2\n");
733 
734                 if ((sharpsl_check_battery_temp() < 0) || (sharpsl_check_battery_voltage() < 0))
735                         return sharpsl_off_charge_error();
736 
737                 sharpsl_pm.machinfo->charge(0);
738                 mdelay(SHARPSL_CHARGE_WAIT_TIME);
739                 sharpsl_pm.machinfo->charge(1);
740                 sharpsl_pm.charge_mode = CHRG_ON;
741 
742                 mdelay(SHARPSL_CHARGE_CO_CHECK_TIME);
743 
744                 time = RCNR;
745                 while (1) {
746                         /* Check if any wakeup event had occurred */
747                         if (sharpsl_pm.machinfo->charger_wakeup())
748                                 return 0;
749                         /* Check for timeout */
750                         if ((RCNR - time) > SHARPSL_WAIT_CO_TIME)
751                                 return 1;
752                         if (sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_CHRGFULL)) {
753                                 dev_dbg(sharpsl_pm.dev, "Offline Charger: Charge full occurred. Retrying to check\n");
754                                 sharpsl_pm.full_count++;
755                                 sharpsl_pm.machinfo->charge(0);
756                                 mdelay(SHARPSL_CHARGE_WAIT_TIME);
757                                 sharpsl_pm.machinfo->charge(1);
758                                 return 1;
759                         }
760                 }
761         }
762 
763         dev_dbg(sharpsl_pm.dev, "Offline Charger: Step 3\n");
764 
765         mdelay(SHARPSL_CHARGE_CO_CHECK_TIME);
766 
767         time = RCNR;
768         while (1) {
769                 /* Check if any wakeup event had occurred */
770                 if (sharpsl_pm.machinfo->charger_wakeup())
771                         return 0;
772                 /* Check for timeout */
773                 if ((RCNR-time) > SHARPSL_WAIT_CO_TIME) {
774                         if (sharpsl_pm.full_count > SHARPSL_CHARGE_RETRY_CNT) {
775                                 dev_dbg(sharpsl_pm.dev, "Offline Charger: Not charged sufficiently. Retrying.\n");
776                                 sharpsl_pm.full_count = 0;
777                         }
778                         sharpsl_pm.full_count++;
779                         return 1;
780                 }
781                 if (sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_CHRGFULL)) {
782                         dev_dbg(sharpsl_pm.dev, "Offline Charger: Charging complete.\n");
783                         sharpsl_pm_led(SHARPSL_LED_OFF);
784                         sharpsl_pm.machinfo->charge(0);
785                         sharpsl_pm.charge_mode = CHRG_DONE;
786                         return 1;
787                 }
788         }
789 }
790 #else
791 #define sharpsl_pm_suspend      NULL
792 #define sharpsl_pm_resume       NULL
793 #endif
794 
795 static ssize_t battery_percentage_show(struct device *dev, struct device_attribute *attr, char *buf)
796 {
797         return sprintf(buf, "%d\n", sharpsl_pm.battstat.mainbat_percent);
798 }
799 
800 static ssize_t battery_voltage_show(struct device *dev, struct device_attribute *attr, char *buf)
801 {
802         return sprintf(buf, "%d\n", sharpsl_pm.battstat.mainbat_voltage);
803 }
804 
805 static DEVICE_ATTR_RO(battery_percentage);
806 static DEVICE_ATTR_RO(battery_voltage);
807 
808 extern void (*apm_get_power_status)(struct apm_power_info *);
809 
810 static void sharpsl_apm_get_power_status(struct apm_power_info *info)
811 {
812         info->ac_line_status = sharpsl_pm.battstat.ac_status;
813 
814         if (sharpsl_pm.charge_mode == CHRG_ON)
815                 info->battery_status = APM_BATTERY_STATUS_CHARGING;
816         else
817                 info->battery_status = sharpsl_pm.battstat.mainbat_status;
818 
819         info->battery_flag = (1 << info->battery_status);
820         info->battery_life = sharpsl_pm.battstat.mainbat_percent;
821 }
822 
823 #ifdef CONFIG_PM
824 static const struct platform_suspend_ops sharpsl_pm_ops = {
825         .prepare        = pxa_pm_prepare,
826         .finish         = pxa_pm_finish,
827         .enter          = corgi_pxa_pm_enter,
828         .valid          = suspend_valid_only_mem,
829 };
830 #endif
831 
832 static int sharpsl_pm_probe(struct platform_device *pdev)
833 {
834         int ret, irq;
835 
836         if (!pdev->dev.platform_data)
837                 return -EINVAL;
838 
839         sharpsl_pm.dev = &pdev->dev;
840         sharpsl_pm.machinfo = pdev->dev.platform_data;
841         sharpsl_pm.charge_mode = CHRG_OFF;
842         sharpsl_pm.flags = 0;
843 
844         timer_setup(&sharpsl_pm.ac_timer, sharpsl_ac_timer, 0);
845 
846         timer_setup(&sharpsl_pm.chrg_full_timer, sharpsl_chrg_full_timer, 0);
847 
848         led_trigger_register_simple("sharpsl-charge", &sharpsl_charge_led_trigger);
849 
850         sharpsl_pm.machinfo->init();
851 
852         gpio_request(sharpsl_pm.machinfo->gpio_acin, "AC IN");
853         gpio_direction_input(sharpsl_pm.machinfo->gpio_acin);
854         gpio_request(sharpsl_pm.machinfo->gpio_batfull, "Battery Full");
855         gpio_direction_input(sharpsl_pm.machinfo->gpio_batfull);
856         gpio_request(sharpsl_pm.machinfo->gpio_batlock, "Battery Lock");
857         gpio_direction_input(sharpsl_pm.machinfo->gpio_batlock);
858 
859         /* Register interrupt handlers */
860         irq = gpio_to_irq(sharpsl_pm.machinfo->gpio_acin);
861         if (request_irq(irq, sharpsl_ac_isr, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, "AC Input Detect", sharpsl_ac_isr)) {
862                 dev_err(sharpsl_pm.dev, "Could not get irq %d.\n", irq);
863         }
864 
865         irq = gpio_to_irq(sharpsl_pm.machinfo->gpio_batlock);
866         if (request_irq(irq, sharpsl_fatal_isr, IRQF_TRIGGER_FALLING, "Battery Cover", sharpsl_fatal_isr)) {
867                 dev_err(sharpsl_pm.dev, "Could not get irq %d.\n", irq);
868         }
869 
870         if (sharpsl_pm.machinfo->gpio_fatal) {
871                 irq = gpio_to_irq(sharpsl_pm.machinfo->gpio_fatal);
872                 if (request_irq(irq, sharpsl_fatal_isr, IRQF_TRIGGER_FALLING, "Fatal Battery", sharpsl_fatal_isr)) {
873                         dev_err(sharpsl_pm.dev, "Could not get irq %d.\n", irq);
874                 }
875         }
876 
877         if (sharpsl_pm.machinfo->batfull_irq) {
878                 /* Register interrupt handler. */
879                 irq = gpio_to_irq(sharpsl_pm.machinfo->gpio_batfull);
880                 if (request_irq(irq, sharpsl_chrg_full_isr, IRQF_TRIGGER_RISING, "CO", sharpsl_chrg_full_isr)) {
881                         dev_err(sharpsl_pm.dev, "Could not get irq %d.\n", irq);
882                 }
883         }
884 
885         ret = device_create_file(&pdev->dev, &dev_attr_battery_percentage);
886         ret |= device_create_file(&pdev->dev, &dev_attr_battery_voltage);
887         if (ret != 0)
888                 dev_warn(&pdev->dev, "Failed to register attributes (%d)\n", ret);
889 
890         apm_get_power_status = sharpsl_apm_get_power_status;
891 
892 #ifdef CONFIG_PM
893         suspend_set_ops(&sharpsl_pm_ops);
894 #endif
895 
896         mod_timer(&sharpsl_pm.ac_timer, jiffies + msecs_to_jiffies(250));
897 
898         return 0;
899 }
900 
901 static int sharpsl_pm_remove(struct platform_device *pdev)
902 {
903         suspend_set_ops(NULL);
904 
905         device_remove_file(&pdev->dev, &dev_attr_battery_percentage);
906         device_remove_file(&pdev->dev, &dev_attr_battery_voltage);
907 
908         led_trigger_unregister_simple(sharpsl_charge_led_trigger);
909 
910         free_irq(gpio_to_irq(sharpsl_pm.machinfo->gpio_acin), sharpsl_ac_isr);
911         free_irq(gpio_to_irq(sharpsl_pm.machinfo->gpio_batlock), sharpsl_fatal_isr);
912 
913         if (sharpsl_pm.machinfo->gpio_fatal)
914                 free_irq(gpio_to_irq(sharpsl_pm.machinfo->gpio_fatal), sharpsl_fatal_isr);
915 
916         if (sharpsl_pm.machinfo->batfull_irq)
917                 free_irq(gpio_to_irq(sharpsl_pm.machinfo->gpio_batfull), sharpsl_chrg_full_isr);
918 
919         gpio_free(sharpsl_pm.machinfo->gpio_batlock);
920         gpio_free(sharpsl_pm.machinfo->gpio_batfull);
921         gpio_free(sharpsl_pm.machinfo->gpio_acin);
922 
923         if (sharpsl_pm.machinfo->exit)
924                 sharpsl_pm.machinfo->exit();
925 
926         del_timer_sync(&sharpsl_pm.chrg_full_timer);
927         del_timer_sync(&sharpsl_pm.ac_timer);
928 
929         return 0;
930 }
931 
932 static struct platform_driver sharpsl_pm_driver = {
933         .probe          = sharpsl_pm_probe,
934         .remove         = sharpsl_pm_remove,
935         .suspend        = sharpsl_pm_suspend,
936         .resume         = sharpsl_pm_resume,
937         .driver         = {
938                 .name           = "sharpsl-pm",
939         },
940 };
941 
942 static int sharpsl_pm_init(void)
943 {
944         return platform_driver_register(&sharpsl_pm_driver);
945 }
946 
947 static void sharpsl_pm_exit(void)
948 {
949         platform_driver_unregister(&sharpsl_pm_driver);
950 }
951 
952 late_initcall(sharpsl_pm_init);
953 module_exit(sharpsl_pm_exit);
954 

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