xref: /linux/arch/arm/mach-pxa/sharpsl_pm.c (revision a1c613ae4c322ddd58d5a8539dbfba2a0380a8c0)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Battery and Power Management code for the Sharp SL-C7xx and SL-Cxx00
4  * series of PDAs
5  *
6  * Copyright (c) 2004-2005 Richard Purdie
7  *
8  * Based on code written by Sharp for 2.4 kernels
9  */
10 
11 #undef DEBUG
12 
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/interrupt.h>
16 #include <linux/platform_device.h>
17 #include <linux/apm-emulation.h>
18 #include <linux/timer.h>
19 #include <linux/delay.h>
20 #include <linux/leds.h>
21 #include <linux/suspend.h>
22 #include <linux/gpio.h>
23 #include <linux/io.h>
24 
25 #include <asm/mach-types.h>
26 #include "pm.h"
27 #include "pxa2xx-regs.h"
28 #include "regs-rtc.h"
29 #include "sharpsl_pm.h"
30 
31 /*
32  * Constants
33  */
34 #define SHARPSL_CHARGE_ON_TIME_INTERVAL        (msecs_to_jiffies(1*60*1000))  /* 1 min */
35 #define SHARPSL_CHARGE_FINISH_TIME             (msecs_to_jiffies(10*60*1000)) /* 10 min */
36 #define SHARPSL_BATCHK_TIME                    (msecs_to_jiffies(15*1000))    /* 15 sec */
37 #define SHARPSL_BATCHK_TIME_SUSPEND            (60*10)                        /* 10 min */
38 
39 #define SHARPSL_WAIT_CO_TIME                   15  /* 15 sec */
40 #define SHARPSL_WAIT_DISCHARGE_ON              100 /* 100 msec */
41 #define SHARPSL_CHECK_BATTERY_WAIT_TIME_TEMP   10  /* 10 msec */
42 #define SHARPSL_CHECK_BATTERY_WAIT_TIME_VOLT   10  /* 10 msec */
43 #define SHARPSL_CHECK_BATTERY_WAIT_TIME_ACIN   10  /* 10 msec */
44 #define SHARPSL_CHARGE_WAIT_TIME               15  /* 15 msec */
45 #define SHARPSL_CHARGE_CO_CHECK_TIME           5   /* 5 msec */
46 #define SHARPSL_CHARGE_RETRY_CNT               1   /* eqv. 10 min */
47 
48 /*
49  * Prototypes
50  */
51 #ifdef CONFIG_PM
52 static int sharpsl_off_charge_battery(void);
53 static int sharpsl_check_battery_voltage(void);
54 #endif
55 static int sharpsl_check_battery_temp(void);
56 static int sharpsl_ac_check(void);
57 static int sharpsl_average_value(int ad);
58 static void sharpsl_average_clear(void);
59 static void sharpsl_charge_toggle(struct work_struct *private_);
60 static void sharpsl_battery_thread(struct work_struct *private_);
61 
62 
63 /*
64  * Variables
65  */
66 struct sharpsl_pm_status sharpsl_pm;
67 static DECLARE_DELAYED_WORK(toggle_charger, sharpsl_charge_toggle);
68 static DECLARE_DELAYED_WORK(sharpsl_bat, sharpsl_battery_thread);
69 DEFINE_LED_TRIGGER(sharpsl_charge_led_trigger);
70 
71 
72 
73 struct battery_thresh sharpsl_battery_levels_acin[] = {
74 	{ 213, 100},
75 	{ 212,  98},
76 	{ 211,  95},
77 	{ 210,  93},
78 	{ 209,  90},
79 	{ 208,  88},
80 	{ 207,  85},
81 	{ 206,  83},
82 	{ 205,  80},
83 	{ 204,  78},
84 	{ 203,  75},
85 	{ 202,  73},
86 	{ 201,  70},
87 	{ 200,  68},
88 	{ 199,  65},
89 	{ 198,  63},
90 	{ 197,  60},
91 	{ 196,  58},
92 	{ 195,  55},
93 	{ 194,  53},
94 	{ 193,  50},
95 	{ 192,  48},
96 	{ 192,  45},
97 	{ 191,  43},
98 	{ 191,  40},
99 	{ 190,  38},
100 	{ 190,  35},
101 	{ 189,  33},
102 	{ 188,  30},
103 	{ 187,  28},
104 	{ 186,  25},
105 	{ 185,  23},
106 	{ 184,  20},
107 	{ 183,  18},
108 	{ 182,  15},
109 	{ 181,  13},
110 	{ 180,  10},
111 	{ 179,   8},
112 	{ 178,   5},
113 	{   0,   0},
114 };
115 
116 struct battery_thresh sharpsl_battery_levels_noac[] = {
117 	{ 213, 100},
118 	{ 212,  98},
119 	{ 211,  95},
120 	{ 210,  93},
121 	{ 209,  90},
122 	{ 208,  88},
123 	{ 207,  85},
124 	{ 206,  83},
125 	{ 205,  80},
126 	{ 204,  78},
127 	{ 203,  75},
128 	{ 202,  73},
129 	{ 201,  70},
130 	{ 200,  68},
131 	{ 199,  65},
132 	{ 198,  63},
133 	{ 197,  60},
134 	{ 196,  58},
135 	{ 195,  55},
136 	{ 194,  53},
137 	{ 193,  50},
138 	{ 192,  48},
139 	{ 191,  45},
140 	{ 190,  43},
141 	{ 189,  40},
142 	{ 188,  38},
143 	{ 187,  35},
144 	{ 186,  33},
145 	{ 185,  30},
146 	{ 184,  28},
147 	{ 183,  25},
148 	{ 182,  23},
149 	{ 181,  20},
150 	{ 180,  18},
151 	{ 179,  15},
152 	{ 178,  13},
153 	{ 177,  10},
154 	{ 176,   8},
155 	{ 175,   5},
156 	{   0,   0},
157 };
158 
159 /* MAX1111 Commands */
160 #define MAXCTRL_PD0      (1u << 0)
161 #define MAXCTRL_PD1      (1u << 1)
162 #define MAXCTRL_SGL      (1u << 2)
163 #define MAXCTRL_UNI      (1u << 3)
164 #define MAXCTRL_SEL_SH   4
165 #define MAXCTRL_STR      (1u << 7)
166 
167 extern int max1111_read_channel(int);
168 /*
169  * Read MAX1111 ADC
170  */
sharpsl_pm_pxa_read_max1111(int channel)171 int sharpsl_pm_pxa_read_max1111(int channel)
172 {
173 	/* max1111 accepts channels from 0-3, however,
174 	 * it is encoded from 0-7 here in the code.
175 	 */
176 	return max1111_read_channel(channel >> 1);
177 }
178 
get_percentage(int voltage)179 static int get_percentage(int voltage)
180 {
181 	int i = sharpsl_pm.machinfo->bat_levels - 1;
182 	int bl_status = sharpsl_pm.machinfo->backlight_get_status ? sharpsl_pm.machinfo->backlight_get_status() : 0;
183 	struct battery_thresh *thresh;
184 
185 	if (sharpsl_pm.charge_mode == CHRG_ON)
186 		thresh = bl_status ? sharpsl_pm.machinfo->bat_levels_acin_bl : sharpsl_pm.machinfo->bat_levels_acin;
187 	else
188 		thresh = bl_status ? sharpsl_pm.machinfo->bat_levels_noac_bl : sharpsl_pm.machinfo->bat_levels_noac;
189 
190 	while (i > 0 && (voltage > thresh[i].voltage))
191 		i--;
192 
193 	return thresh[i].percentage;
194 }
195 
get_apm_status(int voltage)196 static int get_apm_status(int voltage)
197 {
198 	int low_thresh, high_thresh;
199 
200 	if (sharpsl_pm.charge_mode == CHRG_ON) {
201 		high_thresh = sharpsl_pm.machinfo->status_high_acin;
202 		low_thresh = sharpsl_pm.machinfo->status_low_acin;
203 	} else {
204 		high_thresh = sharpsl_pm.machinfo->status_high_noac;
205 		low_thresh = sharpsl_pm.machinfo->status_low_noac;
206 	}
207 
208 	if (voltage >= high_thresh)
209 		return APM_BATTERY_STATUS_HIGH;
210 	if (voltage >= low_thresh)
211 		return APM_BATTERY_STATUS_LOW;
212 	return APM_BATTERY_STATUS_CRITICAL;
213 }
214 
sharpsl_battery_kick(void)215 void sharpsl_battery_kick(void)
216 {
217 	schedule_delayed_work(&sharpsl_bat, msecs_to_jiffies(125));
218 }
219 
sharpsl_battery_thread(struct work_struct * private_)220 static void sharpsl_battery_thread(struct work_struct *private_)
221 {
222 	int voltage, percent, apm_status, i;
223 
224 	if (!sharpsl_pm.machinfo)
225 		return;
226 
227 	sharpsl_pm.battstat.ac_status = (sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN) ? APM_AC_ONLINE : APM_AC_OFFLINE);
228 
229 	/* Corgi cannot confirm when battery fully charged so periodically kick! */
230 	if (!sharpsl_pm.machinfo->batfull_irq && (sharpsl_pm.charge_mode == CHRG_ON)
231 			&& time_after(jiffies, sharpsl_pm.charge_start_time +  SHARPSL_CHARGE_ON_TIME_INTERVAL))
232 		schedule_delayed_work(&toggle_charger, 0);
233 
234 	for (i = 0; i < 5; i++) {
235 		voltage = sharpsl_pm.machinfo->read_devdata(SHARPSL_BATT_VOLT);
236 		if (voltage > 0)
237 			break;
238 	}
239 	if (voltage <= 0) {
240 		voltage = sharpsl_pm.machinfo->bat_levels_noac[0].voltage;
241 		dev_warn(sharpsl_pm.dev, "Warning: Cannot read main battery!\n");
242 	}
243 
244 	voltage = sharpsl_average_value(voltage);
245 	apm_status = get_apm_status(voltage);
246 	percent = get_percentage(voltage);
247 
248 	/* At low battery voltages, the voltage has a tendency to start
249 	   creeping back up so we try to avoid this here */
250 	if ((sharpsl_pm.battstat.ac_status == APM_AC_ONLINE)
251 	    || (apm_status == APM_BATTERY_STATUS_HIGH)
252 	    || percent <= sharpsl_pm.battstat.mainbat_percent) {
253 		sharpsl_pm.battstat.mainbat_voltage = voltage;
254 		sharpsl_pm.battstat.mainbat_status = apm_status;
255 		sharpsl_pm.battstat.mainbat_percent = percent;
256 	}
257 
258 	dev_dbg(sharpsl_pm.dev, "Battery: voltage: %d, status: %d, percentage: %d, time: %ld\n", voltage,
259 			sharpsl_pm.battstat.mainbat_status, sharpsl_pm.battstat.mainbat_percent, jiffies);
260 
261 	/* Suspend if critical battery level */
262 	if ((sharpsl_pm.battstat.ac_status != APM_AC_ONLINE)
263 	     && (sharpsl_pm.battstat.mainbat_status == APM_BATTERY_STATUS_CRITICAL)
264 	     && !(sharpsl_pm.flags & SHARPSL_APM_QUEUED)) {
265 		sharpsl_pm.flags |= SHARPSL_APM_QUEUED;
266 		dev_err(sharpsl_pm.dev, "Fatal Off\n");
267 		apm_queue_event(APM_CRITICAL_SUSPEND);
268 	}
269 
270 	schedule_delayed_work(&sharpsl_bat, SHARPSL_BATCHK_TIME);
271 }
272 
sharpsl_pm_led(int val)273 void sharpsl_pm_led(int val)
274 {
275 	if (val == SHARPSL_LED_ERROR) {
276 		dev_err(sharpsl_pm.dev, "Charging Error!\n");
277 	} else if (val == SHARPSL_LED_ON) {
278 		dev_dbg(sharpsl_pm.dev, "Charge LED On\n");
279 		led_trigger_event(sharpsl_charge_led_trigger, LED_FULL);
280 	} else {
281 		dev_dbg(sharpsl_pm.dev, "Charge LED Off\n");
282 		led_trigger_event(sharpsl_charge_led_trigger, LED_OFF);
283 	}
284 }
285 
sharpsl_charge_on(void)286 static void sharpsl_charge_on(void)
287 {
288 	dev_dbg(sharpsl_pm.dev, "Turning Charger On\n");
289 
290 	sharpsl_pm.full_count = 0;
291 	sharpsl_pm.charge_mode = CHRG_ON;
292 	schedule_delayed_work(&toggle_charger, msecs_to_jiffies(250));
293 	schedule_delayed_work(&sharpsl_bat, msecs_to_jiffies(500));
294 }
295 
sharpsl_charge_off(void)296 static void sharpsl_charge_off(void)
297 {
298 	dev_dbg(sharpsl_pm.dev, "Turning Charger Off\n");
299 
300 	sharpsl_pm.machinfo->charge(0);
301 	sharpsl_pm_led(SHARPSL_LED_OFF);
302 	sharpsl_pm.charge_mode = CHRG_OFF;
303 
304 	schedule_delayed_work(&sharpsl_bat, 0);
305 }
306 
sharpsl_charge_error(void)307 static void sharpsl_charge_error(void)
308 {
309 	sharpsl_pm_led(SHARPSL_LED_ERROR);
310 	sharpsl_pm.machinfo->charge(0);
311 	sharpsl_pm.charge_mode = CHRG_ERROR;
312 }
313 
sharpsl_charge_toggle(struct work_struct * private_)314 static void sharpsl_charge_toggle(struct work_struct *private_)
315 {
316 	dev_dbg(sharpsl_pm.dev, "Toggling Charger at time: %lx\n", jiffies);
317 
318 	if (!sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN)) {
319 		sharpsl_charge_off();
320 		return;
321 	} else if ((sharpsl_check_battery_temp() < 0) || (sharpsl_ac_check() < 0)) {
322 		sharpsl_charge_error();
323 		return;
324 	}
325 
326 	sharpsl_pm_led(SHARPSL_LED_ON);
327 	sharpsl_pm.machinfo->charge(0);
328 	mdelay(SHARPSL_CHARGE_WAIT_TIME);
329 	sharpsl_pm.machinfo->charge(1);
330 
331 	sharpsl_pm.charge_start_time = jiffies;
332 }
333 
sharpsl_ac_timer(struct timer_list * unused)334 static void sharpsl_ac_timer(struct timer_list *unused)
335 {
336 	int acin = sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN);
337 
338 	dev_dbg(sharpsl_pm.dev, "AC Status: %d\n", acin);
339 
340 	sharpsl_average_clear();
341 	if (acin && (sharpsl_pm.charge_mode != CHRG_ON))
342 		sharpsl_charge_on();
343 	else if (sharpsl_pm.charge_mode == CHRG_ON)
344 		sharpsl_charge_off();
345 
346 	schedule_delayed_work(&sharpsl_bat, 0);
347 }
348 
349 
sharpsl_ac_isr(int irq,void * dev_id)350 static irqreturn_t sharpsl_ac_isr(int irq, void *dev_id)
351 {
352 	/* Delay the event slightly to debounce */
353 	/* Must be a smaller delay than the chrg_full_isr below */
354 	mod_timer(&sharpsl_pm.ac_timer, jiffies + msecs_to_jiffies(250));
355 
356 	return IRQ_HANDLED;
357 }
358 
sharpsl_chrg_full_timer(struct timer_list * unused)359 static void sharpsl_chrg_full_timer(struct timer_list *unused)
360 {
361 	dev_dbg(sharpsl_pm.dev, "Charge Full at time: %lx\n", jiffies);
362 
363 	sharpsl_pm.full_count++;
364 
365 	if (!sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN)) {
366 		dev_dbg(sharpsl_pm.dev, "Charge Full: AC removed - stop charging!\n");
367 		if (sharpsl_pm.charge_mode == CHRG_ON)
368 			sharpsl_charge_off();
369 	} else if (sharpsl_pm.full_count < 2) {
370 		dev_dbg(sharpsl_pm.dev, "Charge Full: Count too low\n");
371 		schedule_delayed_work(&toggle_charger, 0);
372 	} else if (time_after(jiffies, sharpsl_pm.charge_start_time + SHARPSL_CHARGE_FINISH_TIME)) {
373 		dev_dbg(sharpsl_pm.dev, "Charge Full: Interrupt generated too slowly - retry.\n");
374 		schedule_delayed_work(&toggle_charger, 0);
375 	} else {
376 		sharpsl_charge_off();
377 		sharpsl_pm.charge_mode = CHRG_DONE;
378 		dev_dbg(sharpsl_pm.dev, "Charge Full: Charging Finished\n");
379 	}
380 }
381 
382 /* Charging Finished Interrupt (Not present on Corgi) */
383 /* Can trigger at the same time as an AC status change so
384    delay until after that has been processed */
sharpsl_chrg_full_isr(int irq,void * dev_id)385 static irqreturn_t sharpsl_chrg_full_isr(int irq, void *dev_id)
386 {
387 	if (sharpsl_pm.flags & SHARPSL_SUSPENDED)
388 		return IRQ_HANDLED;
389 
390 	/* delay until after any ac interrupt */
391 	mod_timer(&sharpsl_pm.chrg_full_timer, jiffies + msecs_to_jiffies(500));
392 
393 	return IRQ_HANDLED;
394 }
395 
sharpsl_fatal_isr(int irq,void * dev_id)396 static irqreturn_t sharpsl_fatal_isr(int irq, void *dev_id)
397 {
398 	int is_fatal = 0;
399 
400 	if (!sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_LOCK)) {
401 		dev_err(sharpsl_pm.dev, "Battery now Unlocked! Suspending.\n");
402 		is_fatal = 1;
403 	}
404 
405 	if (!sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_FATAL)) {
406 		dev_err(sharpsl_pm.dev, "Fatal Batt Error! Suspending.\n");
407 		is_fatal = 1;
408 	}
409 
410 	if (!(sharpsl_pm.flags & SHARPSL_APM_QUEUED) && is_fatal) {
411 		sharpsl_pm.flags |= SHARPSL_APM_QUEUED;
412 		apm_queue_event(APM_CRITICAL_SUSPEND);
413 	}
414 
415 	return IRQ_HANDLED;
416 }
417 
418 /*
419  * Maintain an average of the last 10 readings
420  */
421 #define SHARPSL_CNV_VALUE_NUM    10
422 static int sharpsl_ad_index;
423 
sharpsl_average_clear(void)424 static void sharpsl_average_clear(void)
425 {
426 	sharpsl_ad_index = 0;
427 }
428 
sharpsl_average_value(int ad)429 static int sharpsl_average_value(int ad)
430 {
431 	int i, ad_val = 0;
432 	static int sharpsl_ad[SHARPSL_CNV_VALUE_NUM+1];
433 
434 	if (sharpsl_pm.battstat.mainbat_status != APM_BATTERY_STATUS_HIGH) {
435 		sharpsl_ad_index = 0;
436 		return ad;
437 	}
438 
439 	sharpsl_ad[sharpsl_ad_index] = ad;
440 	sharpsl_ad_index++;
441 	if (sharpsl_ad_index >= SHARPSL_CNV_VALUE_NUM) {
442 		for (i = 0; i < (SHARPSL_CNV_VALUE_NUM-1); i++)
443 			sharpsl_ad[i] = sharpsl_ad[i+1];
444 		sharpsl_ad_index = SHARPSL_CNV_VALUE_NUM - 1;
445 	}
446 	for (i = 0; i < sharpsl_ad_index; i++)
447 		ad_val += sharpsl_ad[i];
448 
449 	return ad_val / sharpsl_ad_index;
450 }
451 
452 /*
453  * Take an array of 5 integers, remove the maximum and minimum values
454  * and return the average.
455  */
get_select_val(int * val)456 static int get_select_val(int *val)
457 {
458 	int i, j, k, temp, sum = 0;
459 
460 	/* Find MAX val */
461 	temp = val[0];
462 	j = 0;
463 	for (i = 1; i < 5; i++) {
464 		if (temp < val[i]) {
465 			temp = val[i];
466 			j = i;
467 		}
468 	}
469 
470 	/* Find MIN val */
471 	temp = val[4];
472 	k = 4;
473 	for (i = 3; i >= 0; i--) {
474 		if (temp > val[i]) {
475 			temp = val[i];
476 			k = i;
477 		}
478 	}
479 
480 	for (i = 0; i < 5; i++)
481 		if (i != j && i != k)
482 			sum += val[i];
483 
484 	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]);
485 
486 	return sum/3;
487 }
488 
sharpsl_check_battery_temp(void)489 static int sharpsl_check_battery_temp(void)
490 {
491 	int val, i, buff[5];
492 
493 	/* Check battery temperature */
494 	for (i = 0; i < 5; i++) {
495 		mdelay(SHARPSL_CHECK_BATTERY_WAIT_TIME_TEMP);
496 		sharpsl_pm.machinfo->measure_temp(1);
497 		mdelay(SHARPSL_CHECK_BATTERY_WAIT_TIME_TEMP);
498 		buff[i] = sharpsl_pm.machinfo->read_devdata(SHARPSL_BATT_TEMP);
499 		sharpsl_pm.machinfo->measure_temp(0);
500 	}
501 
502 	val = get_select_val(buff);
503 
504 	dev_dbg(sharpsl_pm.dev, "Temperature: %d\n", val);
505 	if (val > sharpsl_pm.machinfo->charge_on_temp) {
506 		printk(KERN_WARNING "Not charging: temperature out of limits.\n");
507 		return -1;
508 	}
509 
510 	return 0;
511 }
512 
513 #ifdef CONFIG_PM
sharpsl_check_battery_voltage(void)514 static int sharpsl_check_battery_voltage(void)
515 {
516 	int val, i, buff[5];
517 
518 	/* disable charge, enable discharge */
519 	sharpsl_pm.machinfo->charge(0);
520 	sharpsl_pm.machinfo->discharge(1);
521 	mdelay(SHARPSL_WAIT_DISCHARGE_ON);
522 
523 	if (sharpsl_pm.machinfo->discharge1)
524 		sharpsl_pm.machinfo->discharge1(1);
525 
526 	/* Check battery voltage */
527 	for (i = 0; i < 5; i++) {
528 		buff[i] = sharpsl_pm.machinfo->read_devdata(SHARPSL_BATT_VOLT);
529 		mdelay(SHARPSL_CHECK_BATTERY_WAIT_TIME_VOLT);
530 	}
531 
532 	if (sharpsl_pm.machinfo->discharge1)
533 		sharpsl_pm.machinfo->discharge1(0);
534 
535 	sharpsl_pm.machinfo->discharge(0);
536 
537 	val = get_select_val(buff);
538 	dev_dbg(sharpsl_pm.dev, "Battery Voltage: %d\n", val);
539 
540 	if (val < sharpsl_pm.machinfo->charge_on_volt)
541 		return -1;
542 
543 	return 0;
544 }
545 #endif
546 
sharpsl_ac_check(void)547 static int sharpsl_ac_check(void)
548 {
549 	int temp, i, buff[5];
550 
551 	for (i = 0; i < 5; i++) {
552 		buff[i] = sharpsl_pm.machinfo->read_devdata(SHARPSL_ACIN_VOLT);
553 		mdelay(SHARPSL_CHECK_BATTERY_WAIT_TIME_ACIN);
554 	}
555 
556 	temp = get_select_val(buff);
557 	dev_dbg(sharpsl_pm.dev, "AC Voltage: %d\n", temp);
558 
559 	if ((temp > sharpsl_pm.machinfo->charge_acin_high) || (temp < sharpsl_pm.machinfo->charge_acin_low)) {
560 		dev_err(sharpsl_pm.dev, "Error: AC check failed: voltage %d.\n", temp);
561 		return -1;
562 	}
563 
564 	return 0;
565 }
566 
567 #ifdef CONFIG_PM
sharpsl_pm_suspend(struct platform_device * pdev,pm_message_t state)568 static int sharpsl_pm_suspend(struct platform_device *pdev, pm_message_t state)
569 {
570 	sharpsl_pm.flags |= SHARPSL_SUSPENDED;
571 	flush_delayed_work(&toggle_charger);
572 	flush_delayed_work(&sharpsl_bat);
573 
574 	if (sharpsl_pm.charge_mode == CHRG_ON)
575 		sharpsl_pm.flags |= SHARPSL_DO_OFFLINE_CHRG;
576 	else
577 		sharpsl_pm.flags &= ~SHARPSL_DO_OFFLINE_CHRG;
578 
579 	return 0;
580 }
581 
sharpsl_pm_resume(struct platform_device * pdev)582 static int sharpsl_pm_resume(struct platform_device *pdev)
583 {
584 	/* Clear the reset source indicators as they break the bootloader upon reboot */
585 	RCSR = 0x0f;
586 	sharpsl_average_clear();
587 	sharpsl_pm.flags &= ~SHARPSL_APM_QUEUED;
588 	sharpsl_pm.flags &= ~SHARPSL_SUSPENDED;
589 
590 	return 0;
591 }
592 
corgi_goto_sleep(unsigned long alarm_time,unsigned int alarm_enable,suspend_state_t state)593 static void corgi_goto_sleep(unsigned long alarm_time, unsigned int alarm_enable, suspend_state_t state)
594 {
595 	dev_dbg(sharpsl_pm.dev, "Time is: %08x\n", RCNR);
596 
597 	dev_dbg(sharpsl_pm.dev, "Offline Charge Activate = %d\n", sharpsl_pm.flags & SHARPSL_DO_OFFLINE_CHRG);
598 	/* not charging and AC-IN! */
599 
600 	if ((sharpsl_pm.flags & SHARPSL_DO_OFFLINE_CHRG) && (sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN))) {
601 		dev_dbg(sharpsl_pm.dev, "Activating Offline Charger...\n");
602 		sharpsl_pm.charge_mode = CHRG_OFF;
603 		sharpsl_pm.flags &= ~SHARPSL_DO_OFFLINE_CHRG;
604 		sharpsl_off_charge_battery();
605 	}
606 
607 	sharpsl_pm.machinfo->presuspend();
608 
609 	PEDR = 0xffffffff; /* clear it */
610 
611 	sharpsl_pm.flags &= ~SHARPSL_ALARM_ACTIVE;
612 	if ((sharpsl_pm.charge_mode == CHRG_ON) && ((alarm_enable && ((alarm_time - RCNR) > (SHARPSL_BATCHK_TIME_SUSPEND + 30))) || !alarm_enable)) {
613 		RTSR &= RTSR_ALE;
614 		RTAR = RCNR + SHARPSL_BATCHK_TIME_SUSPEND;
615 		dev_dbg(sharpsl_pm.dev, "Charging alarm at: %08x\n", RTAR);
616 		sharpsl_pm.flags |= SHARPSL_ALARM_ACTIVE;
617 	} else if (alarm_enable) {
618 		RTSR &= RTSR_ALE;
619 		RTAR = alarm_time;
620 		dev_dbg(sharpsl_pm.dev, "User alarm at: %08x\n", RTAR);
621 	} else {
622 		dev_dbg(sharpsl_pm.dev, "No alarms set.\n");
623 	}
624 
625 	pxa_pm_enter(state);
626 
627 	sharpsl_pm.machinfo->postsuspend();
628 
629 	dev_dbg(sharpsl_pm.dev, "Corgi woken up from suspend: %08x\n", PEDR);
630 }
631 
corgi_enter_suspend(unsigned long alarm_time,unsigned int alarm_enable,suspend_state_t state)632 static int corgi_enter_suspend(unsigned long alarm_time, unsigned int alarm_enable, suspend_state_t state)
633 {
634 	if (!sharpsl_pm.machinfo->should_wakeup(!(sharpsl_pm.flags & SHARPSL_ALARM_ACTIVE) && alarm_enable)) {
635 		if (!(sharpsl_pm.flags & SHARPSL_ALARM_ACTIVE)) {
636 			dev_dbg(sharpsl_pm.dev, "No user triggered wakeup events and not charging. Strange. Suspend.\n");
637 			corgi_goto_sleep(alarm_time, alarm_enable, state);
638 			return 1;
639 		}
640 		if (sharpsl_off_charge_battery()) {
641 			dev_dbg(sharpsl_pm.dev, "Charging. Suspend...\n");
642 			corgi_goto_sleep(alarm_time, alarm_enable, state);
643 			return 1;
644 		}
645 		dev_dbg(sharpsl_pm.dev, "User triggered wakeup in offline charger.\n");
646 	}
647 
648 	if ((!sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_LOCK)) ||
649 	    (!sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_FATAL)))	{
650 		dev_err(sharpsl_pm.dev, "Fatal condition. Suspend.\n");
651 		corgi_goto_sleep(alarm_time, alarm_enable, state);
652 		return 1;
653 	}
654 
655 	return 0;
656 }
657 
corgi_pxa_pm_enter(suspend_state_t state)658 static int corgi_pxa_pm_enter(suspend_state_t state)
659 {
660 	unsigned long alarm_time = RTAR;
661 	unsigned int alarm_status = ((RTSR & RTSR_ALE) != 0);
662 
663 	dev_dbg(sharpsl_pm.dev, "SharpSL suspending for first time.\n");
664 
665 	corgi_goto_sleep(alarm_time, alarm_status, state);
666 
667 	while (corgi_enter_suspend(alarm_time, alarm_status, state))
668 		{}
669 
670 	if (sharpsl_pm.machinfo->earlyresume)
671 		sharpsl_pm.machinfo->earlyresume();
672 
673 	dev_dbg(sharpsl_pm.dev, "SharpSL resuming...\n");
674 
675 	return 0;
676 }
677 
sharpsl_off_charge_error(void)678 static int sharpsl_off_charge_error(void)
679 {
680 	dev_err(sharpsl_pm.dev, "Offline Charger: Error occurred.\n");
681 	sharpsl_pm.machinfo->charge(0);
682 	sharpsl_pm_led(SHARPSL_LED_ERROR);
683 	sharpsl_pm.charge_mode = CHRG_ERROR;
684 	return 1;
685 }
686 
687 /*
688  * Charging Control while suspended
689  * Return 1 - go straight to sleep
690  * Return 0 - sleep or wakeup depending on other factors
691  */
sharpsl_off_charge_battery(void)692 static int sharpsl_off_charge_battery(void)
693 {
694 	int time;
695 
696 	dev_dbg(sharpsl_pm.dev, "Charge Mode: %d\n", sharpsl_pm.charge_mode);
697 
698 	if (sharpsl_pm.charge_mode == CHRG_OFF) {
699 		dev_dbg(sharpsl_pm.dev, "Offline Charger: Step 1\n");
700 
701 		/* AC Check */
702 		if ((sharpsl_ac_check() < 0) || (sharpsl_check_battery_temp() < 0))
703 			return sharpsl_off_charge_error();
704 
705 		/* Start Charging */
706 		sharpsl_pm_led(SHARPSL_LED_ON);
707 		sharpsl_pm.machinfo->charge(0);
708 		mdelay(SHARPSL_CHARGE_WAIT_TIME);
709 		sharpsl_pm.machinfo->charge(1);
710 
711 		sharpsl_pm.charge_mode = CHRG_ON;
712 		sharpsl_pm.full_count = 0;
713 
714 		return 1;
715 	} else if (sharpsl_pm.charge_mode != CHRG_ON) {
716 		return 1;
717 	}
718 
719 	if (sharpsl_pm.full_count == 0) {
720 		int time;
721 
722 		dev_dbg(sharpsl_pm.dev, "Offline Charger: Step 2\n");
723 
724 		if ((sharpsl_check_battery_temp() < 0) || (sharpsl_check_battery_voltage() < 0))
725 			return sharpsl_off_charge_error();
726 
727 		sharpsl_pm.machinfo->charge(0);
728 		mdelay(SHARPSL_CHARGE_WAIT_TIME);
729 		sharpsl_pm.machinfo->charge(1);
730 		sharpsl_pm.charge_mode = CHRG_ON;
731 
732 		mdelay(SHARPSL_CHARGE_CO_CHECK_TIME);
733 
734 		time = RCNR;
735 		while (1) {
736 			/* Check if any wakeup event had occurred */
737 			if (sharpsl_pm.machinfo->charger_wakeup())
738 				return 0;
739 			/* Check for timeout */
740 			if ((RCNR - time) > SHARPSL_WAIT_CO_TIME)
741 				return 1;
742 			if (sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_CHRGFULL)) {
743 				dev_dbg(sharpsl_pm.dev, "Offline Charger: Charge full occurred. Retrying to check\n");
744 				sharpsl_pm.full_count++;
745 				sharpsl_pm.machinfo->charge(0);
746 				mdelay(SHARPSL_CHARGE_WAIT_TIME);
747 				sharpsl_pm.machinfo->charge(1);
748 				return 1;
749 			}
750 		}
751 	}
752 
753 	dev_dbg(sharpsl_pm.dev, "Offline Charger: Step 3\n");
754 
755 	mdelay(SHARPSL_CHARGE_CO_CHECK_TIME);
756 
757 	time = RCNR;
758 	while (1) {
759 		/* Check if any wakeup event had occurred */
760 		if (sharpsl_pm.machinfo->charger_wakeup())
761 			return 0;
762 		/* Check for timeout */
763 		if ((RCNR-time) > SHARPSL_WAIT_CO_TIME) {
764 			if (sharpsl_pm.full_count > SHARPSL_CHARGE_RETRY_CNT) {
765 				dev_dbg(sharpsl_pm.dev, "Offline Charger: Not charged sufficiently. Retrying.\n");
766 				sharpsl_pm.full_count = 0;
767 			}
768 			sharpsl_pm.full_count++;
769 			return 1;
770 		}
771 		if (sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_CHRGFULL)) {
772 			dev_dbg(sharpsl_pm.dev, "Offline Charger: Charging complete.\n");
773 			sharpsl_pm_led(SHARPSL_LED_OFF);
774 			sharpsl_pm.machinfo->charge(0);
775 			sharpsl_pm.charge_mode = CHRG_DONE;
776 			return 1;
777 		}
778 	}
779 }
780 #else
781 #define sharpsl_pm_suspend	NULL
782 #define sharpsl_pm_resume	NULL
783 #endif
784 
battery_percentage_show(struct device * dev,struct device_attribute * attr,char * buf)785 static ssize_t battery_percentage_show(struct device *dev, struct device_attribute *attr, char *buf)
786 {
787 	return sprintf(buf, "%d\n", sharpsl_pm.battstat.mainbat_percent);
788 }
789 
battery_voltage_show(struct device * dev,struct device_attribute * attr,char * buf)790 static ssize_t battery_voltage_show(struct device *dev, struct device_attribute *attr, char *buf)
791 {
792 	return sprintf(buf, "%d\n", sharpsl_pm.battstat.mainbat_voltage);
793 }
794 
795 static DEVICE_ATTR_RO(battery_percentage);
796 static DEVICE_ATTR_RO(battery_voltage);
797 
798 extern void (*apm_get_power_status)(struct apm_power_info *);
799 
sharpsl_apm_get_power_status(struct apm_power_info * info)800 static void sharpsl_apm_get_power_status(struct apm_power_info *info)
801 {
802 	info->ac_line_status = sharpsl_pm.battstat.ac_status;
803 
804 	if (sharpsl_pm.charge_mode == CHRG_ON)
805 		info->battery_status = APM_BATTERY_STATUS_CHARGING;
806 	else
807 		info->battery_status = sharpsl_pm.battstat.mainbat_status;
808 
809 	info->battery_flag = (1 << info->battery_status);
810 	info->battery_life = sharpsl_pm.battstat.mainbat_percent;
811 }
812 
813 #ifdef CONFIG_PM
814 static const struct platform_suspend_ops sharpsl_pm_ops = {
815 	.prepare	= pxa_pm_prepare,
816 	.finish		= pxa_pm_finish,
817 	.enter		= corgi_pxa_pm_enter,
818 	.valid		= suspend_valid_only_mem,
819 };
820 #endif
821 
sharpsl_pm_probe(struct platform_device * pdev)822 static int sharpsl_pm_probe(struct platform_device *pdev)
823 {
824 	int ret, irq;
825 
826 	if (!pdev->dev.platform_data)
827 		return -EINVAL;
828 
829 	sharpsl_pm.dev = &pdev->dev;
830 	sharpsl_pm.machinfo = pdev->dev.platform_data;
831 	sharpsl_pm.charge_mode = CHRG_OFF;
832 	sharpsl_pm.flags = 0;
833 
834 	timer_setup(&sharpsl_pm.ac_timer, sharpsl_ac_timer, 0);
835 
836 	timer_setup(&sharpsl_pm.chrg_full_timer, sharpsl_chrg_full_timer, 0);
837 
838 	led_trigger_register_simple("sharpsl-charge", &sharpsl_charge_led_trigger);
839 
840 	sharpsl_pm.machinfo->init();
841 
842 	gpio_request(sharpsl_pm.machinfo->gpio_acin, "AC IN");
843 	gpio_direction_input(sharpsl_pm.machinfo->gpio_acin);
844 	gpio_request(sharpsl_pm.machinfo->gpio_batfull, "Battery Full");
845 	gpio_direction_input(sharpsl_pm.machinfo->gpio_batfull);
846 	gpio_request(sharpsl_pm.machinfo->gpio_batlock, "Battery Lock");
847 	gpio_direction_input(sharpsl_pm.machinfo->gpio_batlock);
848 
849 	/* Register interrupt handlers */
850 	irq = gpio_to_irq(sharpsl_pm.machinfo->gpio_acin);
851 	if (request_irq(irq, sharpsl_ac_isr, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, "AC Input Detect", sharpsl_ac_isr)) {
852 		dev_err(sharpsl_pm.dev, "Could not get irq %d.\n", irq);
853 	}
854 
855 	irq = gpio_to_irq(sharpsl_pm.machinfo->gpio_batlock);
856 	if (request_irq(irq, sharpsl_fatal_isr, IRQF_TRIGGER_FALLING, "Battery Cover", sharpsl_fatal_isr)) {
857 		dev_err(sharpsl_pm.dev, "Could not get irq %d.\n", irq);
858 	}
859 
860 	if (sharpsl_pm.machinfo->gpio_fatal) {
861 		irq = gpio_to_irq(sharpsl_pm.machinfo->gpio_fatal);
862 		if (request_irq(irq, sharpsl_fatal_isr, IRQF_TRIGGER_FALLING, "Fatal Battery", sharpsl_fatal_isr)) {
863 			dev_err(sharpsl_pm.dev, "Could not get irq %d.\n", irq);
864 		}
865 	}
866 
867 	if (sharpsl_pm.machinfo->batfull_irq) {
868 		/* Register interrupt handler. */
869 		irq = gpio_to_irq(sharpsl_pm.machinfo->gpio_batfull);
870 		if (request_irq(irq, sharpsl_chrg_full_isr, IRQF_TRIGGER_RISING, "CO", sharpsl_chrg_full_isr)) {
871 			dev_err(sharpsl_pm.dev, "Could not get irq %d.\n", irq);
872 		}
873 	}
874 
875 	ret = device_create_file(&pdev->dev, &dev_attr_battery_percentage);
876 	ret |= device_create_file(&pdev->dev, &dev_attr_battery_voltage);
877 	if (ret != 0)
878 		dev_warn(&pdev->dev, "Failed to register attributes (%d)\n", ret);
879 
880 	apm_get_power_status = sharpsl_apm_get_power_status;
881 
882 #ifdef CONFIG_PM
883 	suspend_set_ops(&sharpsl_pm_ops);
884 #endif
885 
886 	mod_timer(&sharpsl_pm.ac_timer, jiffies + msecs_to_jiffies(250));
887 
888 	return 0;
889 }
890 
sharpsl_pm_remove(struct platform_device * pdev)891 static void sharpsl_pm_remove(struct platform_device *pdev)
892 {
893 	suspend_set_ops(NULL);
894 
895 	device_remove_file(&pdev->dev, &dev_attr_battery_percentage);
896 	device_remove_file(&pdev->dev, &dev_attr_battery_voltage);
897 
898 	led_trigger_unregister_simple(sharpsl_charge_led_trigger);
899 
900 	free_irq(gpio_to_irq(sharpsl_pm.machinfo->gpio_acin), sharpsl_ac_isr);
901 	free_irq(gpio_to_irq(sharpsl_pm.machinfo->gpio_batlock), sharpsl_fatal_isr);
902 
903 	if (sharpsl_pm.machinfo->gpio_fatal)
904 		free_irq(gpio_to_irq(sharpsl_pm.machinfo->gpio_fatal), sharpsl_fatal_isr);
905 
906 	if (sharpsl_pm.machinfo->batfull_irq)
907 		free_irq(gpio_to_irq(sharpsl_pm.machinfo->gpio_batfull), sharpsl_chrg_full_isr);
908 
909 	gpio_free(sharpsl_pm.machinfo->gpio_batlock);
910 	gpio_free(sharpsl_pm.machinfo->gpio_batfull);
911 	gpio_free(sharpsl_pm.machinfo->gpio_acin);
912 
913 	if (sharpsl_pm.machinfo->exit)
914 		sharpsl_pm.machinfo->exit();
915 
916 	del_timer_sync(&sharpsl_pm.chrg_full_timer);
917 	del_timer_sync(&sharpsl_pm.ac_timer);
918 }
919 
920 static struct platform_driver sharpsl_pm_driver = {
921 	.probe		= sharpsl_pm_probe,
922 	.remove_new	= sharpsl_pm_remove,
923 	.suspend	= sharpsl_pm_suspend,
924 	.resume		= sharpsl_pm_resume,
925 	.driver		= {
926 		.name		= "sharpsl-pm",
927 	},
928 };
929 
sharpsl_pm_init(void)930 static int sharpsl_pm_init(void)
931 {
932 	return platform_driver_register(&sharpsl_pm_driver);
933 }
934 
sharpsl_pm_exit(void)935 static void sharpsl_pm_exit(void)
936 {
937 	platform_driver_unregister(&sharpsl_pm_driver);
938 }
939 
940 late_initcall(sharpsl_pm_init);
941 module_exit(sharpsl_pm_exit);
942