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dm thin: fix race between simultaneous io and discards to same block
[linux/fpc-iii.git] / drivers / power / ab8500_fg.c
blob2db8cc254399c8093ffcfbbc78c965d68d73f14e
1 /*
2 * Copyright (C) ST-Ericsson AB 2012
3 *
4 * Main and Back-up battery management driver.
5 *
6 * Note: Backup battery management is required in case of Li-Ion battery and not
7 * for capacitive battery. HREF boards have capacitive battery and hence backup
8 * battery management is not used and the supported code is available in this
9 * driver.
10 *
11 * License Terms: GNU General Public License v2
12 * Author:
13 * Johan Palsson <johan.palsson@stericsson.com>
14 * Karl Komierowski <karl.komierowski@stericsson.com>
15 * Arun R Murthy <arun.murthy@stericsson.com>
16 */
17
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/device.h>
21 #include <linux/interrupt.h>
22 #include <linux/platform_device.h>
23 #include <linux/power_supply.h>
24 #include <linux/kobject.h>
25 #include <linux/mfd/abx500/ab8500.h>
26 #include <linux/mfd/abx500.h>
27 #include <linux/slab.h>
28 #include <linux/mfd/abx500/ab8500-bm.h>
29 #include <linux/delay.h>
30 #include <linux/mfd/abx500/ab8500-gpadc.h>
31 #include <linux/mfd/abx500.h>
32 #include <linux/time.h>
33 #include <linux/completion.h>
34
35 #define MILLI_TO_MICRO 1000
36 #define FG_LSB_IN_MA 1627
37 #define QLSB_NANO_AMP_HOURS_X10 1129
38 #define INS_CURR_TIMEOUT (3 * HZ)
39
40 #define SEC_TO_SAMPLE(S) (S * 4)
41
42 #define NBR_AVG_SAMPLES 20
43
44 #define LOW_BAT_CHECK_INTERVAL (2 * HZ)
45
46 #define VALID_CAPACITY_SEC (45 * 60) /* 45 minutes */
47 #define BATT_OK_MIN 2360 /* mV */
48 #define BATT_OK_INCREMENT 50 /* mV */
49 #define BATT_OK_MAX_NR_INCREMENTS 0xE
50
51 /* FG constants */
52 #define BATT_OVV 0x01
53
54 #define interpolate(x, x1, y1, x2, y2) \
55 ((y1) + ((((y2) - (y1)) * ((x) - (x1))) / ((x2) - (x1))));
56
57 #define to_ab8500_fg_device_info(x) container_of((x), \
58 struct ab8500_fg, fg_psy);
59
60 /**
61 * struct ab8500_fg_interrupts - ab8500 fg interupts
62 * @name: name of the interrupt
63 * @isr function pointer to the isr
64 */
65 struct ab8500_fg_interrupts {
66 char *name;
67 irqreturn_t (*isr)(int irq, void *data);
68 };
69
70 enum ab8500_fg_discharge_state {
71 AB8500_FG_DISCHARGE_INIT,
72 AB8500_FG_DISCHARGE_INITMEASURING,
73 AB8500_FG_DISCHARGE_INIT_RECOVERY,
74 AB8500_FG_DISCHARGE_RECOVERY,
75 AB8500_FG_DISCHARGE_READOUT_INIT,
76 AB8500_FG_DISCHARGE_READOUT,
77 AB8500_FG_DISCHARGE_WAKEUP,
78 };
79
80 static char *discharge_state[] = {
81 "DISCHARGE_INIT",
82 "DISCHARGE_INITMEASURING",
83 "DISCHARGE_INIT_RECOVERY",
84 "DISCHARGE_RECOVERY",
85 "DISCHARGE_READOUT_INIT",
86 "DISCHARGE_READOUT",
87 "DISCHARGE_WAKEUP",
88 };
89
90 enum ab8500_fg_charge_state {
91 AB8500_FG_CHARGE_INIT,
92 AB8500_FG_CHARGE_READOUT,
93 };
94
95 static char *charge_state[] = {
96 "CHARGE_INIT",
97 "CHARGE_READOUT",
98 };
99
100 enum ab8500_fg_calibration_state {
101 AB8500_FG_CALIB_INIT,
102 AB8500_FG_CALIB_WAIT,
103 AB8500_FG_CALIB_END,
104 };
105
106 struct ab8500_fg_avg_cap {
107 int avg;
108 int samples[NBR_AVG_SAMPLES];
109 __kernel_time_t time_stamps[NBR_AVG_SAMPLES];
110 int pos;
111 int nbr_samples;
112 int sum;
113 };
114
115 struct ab8500_fg_battery_capacity {
116 int max_mah_design;
117 int max_mah;
118 int mah;
119 int permille;
120 int level;
121 int prev_mah;
122 int prev_percent;
123 int prev_level;
124 int user_mah;
125 };
126
127 struct ab8500_fg_flags {
128 bool fg_enabled;
129 bool conv_done;
130 bool charging;
131 bool fully_charged;
132 bool force_full;
133 bool low_bat_delay;
134 bool low_bat;
135 bool bat_ovv;
136 bool batt_unknown;
137 bool calibrate;
138 bool user_cap;
139 bool batt_id_received;
140 };
141
142 struct inst_curr_result_list {
143 struct list_head list;
144 int *result;
145 };
146
147 /**
148 * struct ab8500_fg - ab8500 FG device information
149 * @dev: Pointer to the structure device
150 * @node: a list of AB8500 FGs, hence prepared for reentrance
151 * @irq holds the CCEOC interrupt number
152 * @vbat: Battery voltage in mV
153 * @vbat_nom: Nominal battery voltage in mV
154 * @inst_curr: Instantenous battery current in mA
155 * @avg_curr: Average battery current in mA
156 * @bat_temp battery temperature
157 * @fg_samples: Number of samples used in the FG accumulation
158 * @accu_charge: Accumulated charge from the last conversion
159 * @recovery_cnt: Counter for recovery mode
160 * @high_curr_cnt: Counter for high current mode
161 * @init_cnt: Counter for init mode
162 * @recovery_needed: Indicate if recovery is needed
163 * @high_curr_mode: Indicate if we're in high current mode
164 * @init_capacity: Indicate if initial capacity measuring should be done
165 * @turn_off_fg: True if fg was off before current measurement
166 * @calib_state State during offset calibration
167 * @discharge_state: Current discharge state
168 * @charge_state: Current charge state
169 * @ab8500_fg_complete Completion struct used for the instant current reading
170 * @flags: Structure for information about events triggered
171 * @bat_cap: Structure for battery capacity specific parameters
172 * @avg_cap: Average capacity filter
173 * @parent: Pointer to the struct ab8500
174 * @gpadc: Pointer to the struct gpadc
175 * @pdata: Pointer to the abx500_fg platform data
176 * @bat: Pointer to the abx500_bm platform data
177 * @fg_psy: Structure that holds the FG specific battery properties
178 * @fg_wq: Work queue for running the FG algorithm
179 * @fg_periodic_work: Work to run the FG algorithm periodically
180 * @fg_low_bat_work: Work to check low bat condition
181 * @fg_reinit_work Work used to reset and reinitialise the FG algorithm
182 * @fg_work: Work to run the FG algorithm instantly
183 * @fg_acc_cur_work: Work to read the FG accumulator
184 * @fg_check_hw_failure_work: Work for checking HW state
185 * @cc_lock: Mutex for locking the CC
186 * @fg_kobject: Structure of type kobject
187 */
188 struct ab8500_fg {
189 struct device *dev;
190 struct list_head node;
191 int irq;
192 int vbat;
193 int vbat_nom;
194 int inst_curr;
195 int avg_curr;
196 int bat_temp;
197 int fg_samples;
198 int accu_charge;
199 int recovery_cnt;
200 int high_curr_cnt;
201 int init_cnt;
202 bool recovery_needed;
203 bool high_curr_mode;
204 bool init_capacity;
205 bool turn_off_fg;
206 enum ab8500_fg_calibration_state calib_state;
207 enum ab8500_fg_discharge_state discharge_state;
208 enum ab8500_fg_charge_state charge_state;
209 struct completion ab8500_fg_complete;
210 struct ab8500_fg_flags flags;
211 struct ab8500_fg_battery_capacity bat_cap;
212 struct ab8500_fg_avg_cap avg_cap;
213 struct ab8500 *parent;
214 struct ab8500_gpadc *gpadc;
215 struct abx500_fg_platform_data *pdata;
216 struct abx500_bm_data *bat;
217 struct power_supply fg_psy;
218 struct workqueue_struct *fg_wq;
219 struct delayed_work fg_periodic_work;
220 struct delayed_work fg_low_bat_work;
221 struct delayed_work fg_reinit_work;
222 struct work_struct fg_work;
223 struct work_struct fg_acc_cur_work;
224 struct delayed_work fg_check_hw_failure_work;
225 struct mutex cc_lock;
226 struct kobject fg_kobject;
227 };
228 static LIST_HEAD(ab8500_fg_list);
229
230 /**
231 * ab8500_fg_get() - returns a reference to the primary AB8500 fuel gauge
232 * (i.e. the first fuel gauge in the instance list)
233 */
234 struct ab8500_fg *ab8500_fg_get(void)
235 {
236 struct ab8500_fg *fg;
237
238 if (list_empty(&ab8500_fg_list))
239 return NULL;
240
241 fg = list_first_entry(&ab8500_fg_list, struct ab8500_fg, node);
242 return fg;
243 }
244
245 /* Main battery properties */
246 static enum power_supply_property ab8500_fg_props[] = {
247 POWER_SUPPLY_PROP_VOLTAGE_NOW,
248 POWER_SUPPLY_PROP_CURRENT_NOW,
249 POWER_SUPPLY_PROP_CURRENT_AVG,
250 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
251 POWER_SUPPLY_PROP_ENERGY_FULL,
252 POWER_SUPPLY_PROP_ENERGY_NOW,
253 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
254 POWER_SUPPLY_PROP_CHARGE_FULL,
255 POWER_SUPPLY_PROP_CHARGE_NOW,
256 POWER_SUPPLY_PROP_CAPACITY,
257 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
258 };
259
260 /*
261 * This array maps the raw hex value to lowbat voltage used by the AB8500
262 * Values taken from the UM0836
263 */
264 static int ab8500_fg_lowbat_voltage_map[] = {
265 2300 ,
266 2325 ,
267 2350 ,
268 2375 ,
269 2400 ,
270 2425 ,
271 2450 ,
272 2475 ,
273 2500 ,
274 2525 ,
275 2550 ,
276 2575 ,
277 2600 ,
278 2625 ,
279 2650 ,
280 2675 ,
281 2700 ,
282 2725 ,
283 2750 ,
284 2775 ,
285 2800 ,
286 2825 ,
287 2850 ,
288 2875 ,
289 2900 ,
290 2925 ,
291 2950 ,
292 2975 ,
293 3000 ,
294 3025 ,
295 3050 ,
296 3075 ,
297 3100 ,
298 3125 ,
299 3150 ,
300 3175 ,
301 3200 ,
302 3225 ,
303 3250 ,
304 3275 ,
305 3300 ,
306 3325 ,
307 3350 ,
308 3375 ,
309 3400 ,
310 3425 ,
311 3450 ,
312 3475 ,
313 3500 ,
314 3525 ,
315 3550 ,
316 3575 ,
317 3600 ,
318 3625 ,
319 3650 ,
320 3675 ,
321 3700 ,
322 3725 ,
323 3750 ,
324 3775 ,
325 3800 ,
326 3825 ,
327 3850 ,
328 3850 ,
329 };
330
331 static u8 ab8500_volt_to_regval(int voltage)
332 {
333 int i;
334
335 if (voltage < ab8500_fg_lowbat_voltage_map[0])
336 return 0;
337
338 for (i = 0; i < ARRAY_SIZE(ab8500_fg_lowbat_voltage_map); i++) {
339 if (voltage < ab8500_fg_lowbat_voltage_map[i])
340 return (u8) i - 1;
341 }
342
343 /* If not captured above, return index of last element */
344 return (u8) ARRAY_SIZE(ab8500_fg_lowbat_voltage_map) - 1;
345 }
346
347 /**
348 * ab8500_fg_is_low_curr() - Low or high current mode
349 * @di: pointer to the ab8500_fg structure
350 * @curr: the current to base or our decision on
351 *
352 * Low current mode if the current consumption is below a certain threshold
353 */
354 static int ab8500_fg_is_low_curr(struct ab8500_fg *di, int curr)
355 {
356 /*
357 * We want to know if we're in low current mode
358 */
359 if (curr > -di->bat->fg_params->high_curr_threshold)
360 return true;
361 else
362 return false;
363 }
364
365 /**
366 * ab8500_fg_add_cap_sample() - Add capacity to average filter
367 * @di: pointer to the ab8500_fg structure
368 * @sample: the capacity in mAh to add to the filter
369 *
370 * A capacity is added to the filter and a new mean capacity is calculated and
371 * returned
372 */
373 static int ab8500_fg_add_cap_sample(struct ab8500_fg *di, int sample)
374 {
375 struct timespec ts;
376 struct ab8500_fg_avg_cap *avg = &di->avg_cap;
377
378 getnstimeofday(&ts);
379
380 do {
381 avg->sum += sample - avg->samples[avg->pos];
382 avg->samples[avg->pos] = sample;
383 avg->time_stamps[avg->pos] = ts.tv_sec;
384 avg->pos++;
385
386 if (avg->pos == NBR_AVG_SAMPLES)
387 avg->pos = 0;
388
389 if (avg->nbr_samples < NBR_AVG_SAMPLES)
390 avg->nbr_samples++;
391
392 /*
393 * Check the time stamp for each sample. If too old,
394 * replace with latest sample
395 */
396 } while (ts.tv_sec - VALID_CAPACITY_SEC > avg->time_stamps[avg->pos]);
397
398 avg->avg = avg->sum / avg->nbr_samples;
399
400 return avg->avg;
401 }
402
403 /**
404 * ab8500_fg_clear_cap_samples() - Clear average filter
405 * @di: pointer to the ab8500_fg structure
406 *
407 * The capacity filter is is reset to zero.
408 */
409 static void ab8500_fg_clear_cap_samples(struct ab8500_fg *di)
410 {
411 int i;
412 struct ab8500_fg_avg_cap *avg = &di->avg_cap;
413
414 avg->pos = 0;
415 avg->nbr_samples = 0;
416 avg->sum = 0;
417 avg->avg = 0;
418
419 for (i = 0; i < NBR_AVG_SAMPLES; i++) {
420 avg->samples[i] = 0;
421 avg->time_stamps[i] = 0;
422 }
423 }
424
425 /**
426 * ab8500_fg_fill_cap_sample() - Fill average filter
427 * @di: pointer to the ab8500_fg structure
428 * @sample: the capacity in mAh to fill the filter with
429 *
430 * The capacity filter is filled with a capacity in mAh
431 */
432 static void ab8500_fg_fill_cap_sample(struct ab8500_fg *di, int sample)
433 {
434 int i;
435 struct timespec ts;
436 struct ab8500_fg_avg_cap *avg = &di->avg_cap;
437
438 getnstimeofday(&ts);
439
440 for (i = 0; i < NBR_AVG_SAMPLES; i++) {
441 avg->samples[i] = sample;
442 avg->time_stamps[i] = ts.tv_sec;
443 }
444
445 avg->pos = 0;
446 avg->nbr_samples = NBR_AVG_SAMPLES;
447 avg->sum = sample * NBR_AVG_SAMPLES;
448 avg->avg = sample;
449 }
450
451 /**
452 * ab8500_fg_coulomb_counter() - enable coulomb counter
453 * @di: pointer to the ab8500_fg structure
454 * @enable: enable/disable
455 *
456 * Enable/Disable coulomb counter.
457 * On failure returns negative value.
458 */
459 static int ab8500_fg_coulomb_counter(struct ab8500_fg *di, bool enable)
460 {
461 int ret = 0;
462 mutex_lock(&di->cc_lock);
463 if (enable) {
464 /* To be able to reprogram the number of samples, we have to
465 * first stop the CC and then enable it again */
466 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
467 AB8500_RTC_CC_CONF_REG, 0x00);
468 if (ret)
469 goto cc_err;
470
471 /* Program the samples */
472 ret = abx500_set_register_interruptible(di->dev,
473 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU,
474 di->fg_samples);
475 if (ret)
476 goto cc_err;
477
478 /* Start the CC */
479 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
480 AB8500_RTC_CC_CONF_REG,
481 (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA));
482 if (ret)
483 goto cc_err;
484
485 di->flags.fg_enabled = true;
486 } else {
487 /* Clear any pending read requests */
488 ret = abx500_set_register_interruptible(di->dev,
489 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 0);
490 if (ret)
491 goto cc_err;
492
493 ret = abx500_set_register_interruptible(di->dev,
494 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU_CTRL, 0);
495 if (ret)
496 goto cc_err;
497
498 /* Stop the CC */
499 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
500 AB8500_RTC_CC_CONF_REG, 0);
501 if (ret)
502 goto cc_err;
503
504 di->flags.fg_enabled = false;
505
506 }
507 dev_dbg(di->dev, " CC enabled: %d Samples: %d\n",
508 enable, di->fg_samples);
509
510 mutex_unlock(&di->cc_lock);
511
512 return ret;
513 cc_err:
514 dev_err(di->dev, "%s Enabling coulomb counter failed\n", __func__);
515 mutex_unlock(&di->cc_lock);
516 return ret;
517 }
518
519 /**
520 * ab8500_fg_inst_curr_start() - start battery instantaneous current
521 * @di: pointer to the ab8500_fg structure
522 *
523 * Returns 0 or error code
524 * Note: This is part "one" and has to be called before
525 * ab8500_fg_inst_curr_finalize()
526 */
527 int ab8500_fg_inst_curr_start(struct ab8500_fg *di)
528 {
529 u8 reg_val;
530 int ret;
531
532 mutex_lock(&di->cc_lock);
533
534 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
535 AB8500_RTC_CC_CONF_REG, &reg_val);
536 if (ret < 0)
537 goto fail;
538
539 if (!(reg_val & CC_PWR_UP_ENA)) {
540 dev_dbg(di->dev, "%s Enable FG\n", __func__);
541 di->turn_off_fg = true;
542
543 /* Program the samples */
544 ret = abx500_set_register_interruptible(di->dev,
545 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU,
546 SEC_TO_SAMPLE(10));
547 if (ret)
548 goto fail;
549
550 /* Start the CC */
551 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
552 AB8500_RTC_CC_CONF_REG,
553 (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA));
554 if (ret)
555 goto fail;
556 } else {
557 di->turn_off_fg = false;
558 }
559
560 /* Return and WFI */
561 INIT_COMPLETION(di->ab8500_fg_complete);
562 enable_irq(di->irq);
563
564 /* Note: cc_lock is still locked */
565 return 0;
566 fail:
567 mutex_unlock(&di->cc_lock);
568 return ret;
569 }
570
571 /**
572 * ab8500_fg_inst_curr_done() - check if fg conversion is done
573 * @di: pointer to the ab8500_fg structure
574 *
575 * Returns 1 if conversion done, 0 if still waiting
576 */
577 int ab8500_fg_inst_curr_done(struct ab8500_fg *di)
578 {
579 return completion_done(&di->ab8500_fg_complete);
580 }
581
582 /**
583 * ab8500_fg_inst_curr_finalize() - battery instantaneous current
584 * @di: pointer to the ab8500_fg structure
585 * @res: battery instantenous current(on success)
586 *
587 * Returns 0 or an error code
588 * Note: This is part "two" and has to be called at earliest 250 ms
589 * after ab8500_fg_inst_curr_start()
590 */
591 int ab8500_fg_inst_curr_finalize(struct ab8500_fg *di, int *res)
592 {
593 u8 low, high;
594 int val;
595 int ret;
596 int timeout;
597
598 if (!completion_done(&di->ab8500_fg_complete)) {
599 timeout = wait_for_completion_timeout(&di->ab8500_fg_complete,
600 INS_CURR_TIMEOUT);
601 dev_dbg(di->dev, "Finalize time: %d ms\n",
602 ((INS_CURR_TIMEOUT - timeout) * 1000) / HZ);
603 if (!timeout) {
604 ret = -ETIME;
605 disable_irq(di->irq);
606 dev_err(di->dev, "completion timed out [%d]\n",
607 __LINE__);
608 goto fail;
609 }
610 }
611
612 disable_irq(di->irq);
613
614 ret = abx500_mask_and_set_register_interruptible(di->dev,
615 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
616 READ_REQ, READ_REQ);
617
618 /* 100uS between read request and read is needed */
619 usleep_range(100, 100);
620
621 /* Read CC Sample conversion value Low and high */
622 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
623 AB8500_GASG_CC_SMPL_CNVL_REG, &low);
624 if (ret < 0)
625 goto fail;
626
627 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
628 AB8500_GASG_CC_SMPL_CNVH_REG, &high);
629 if (ret < 0)
630 goto fail;
631
632 /*
633 * negative value for Discharging
634 * convert 2's compliment into decimal
635 */
636 if (high & 0x10)
637 val = (low | (high << 8) | 0xFFFFE000);
638 else
639 val = (low | (high << 8));
640
641 /*
642 * Convert to unit value in mA
643 * Full scale input voltage is
644 * 66.660mV => LSB = 66.660mV/(4096*res) = 1.627mA
645 * Given a 250ms conversion cycle time the LSB corresponds
646 * to 112.9 nAh. Convert to current by dividing by the conversion
647 * time in hours (250ms = 1 / (3600 * 4)h)
648 * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm
649 */
650 val = (val * QLSB_NANO_AMP_HOURS_X10 * 36 * 4) /
651 (1000 * di->bat->fg_res);
652
653 if (di->turn_off_fg) {
654 dev_dbg(di->dev, "%s Disable FG\n", __func__);
655
656 /* Clear any pending read requests */
657 ret = abx500_set_register_interruptible(di->dev,
658 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 0);
659 if (ret)
660 goto fail;
661
662 /* Stop the CC */
663 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
664 AB8500_RTC_CC_CONF_REG, 0);
665 if (ret)
666 goto fail;
667 }
668 mutex_unlock(&di->cc_lock);
669 (*res) = val;
670
671 return 0;
672 fail:
673 mutex_unlock(&di->cc_lock);
674 return ret;
675 }
676
677 /**
678 * ab8500_fg_inst_curr_blocking() - battery instantaneous current
679 * @di: pointer to the ab8500_fg structure
680 * @res: battery instantenous current(on success)
681 *
682 * Returns 0 else error code
683 */
684 int ab8500_fg_inst_curr_blocking(struct ab8500_fg *di)
685 {
686 int ret;
687 int res = 0;
688
689 ret = ab8500_fg_inst_curr_start(di);
690 if (ret) {
691 dev_err(di->dev, "Failed to initialize fg_inst\n");
692 return 0;
693 }
694
695 ret = ab8500_fg_inst_curr_finalize(di, &res);
696 if (ret) {
697 dev_err(di->dev, "Failed to finalize fg_inst\n");
698 return 0;
699 }
700
701 return res;
702 }
703
704 /**
705 * ab8500_fg_acc_cur_work() - average battery current
706 * @work: pointer to the work_struct structure
707 *
708 * Updated the average battery current obtained from the
709 * coulomb counter.
710 */
711 static void ab8500_fg_acc_cur_work(struct work_struct *work)
712 {
713 int val;
714 int ret;
715 u8 low, med, high;
716
717 struct ab8500_fg *di = container_of(work,
718 struct ab8500_fg, fg_acc_cur_work);
719
720 mutex_lock(&di->cc_lock);
721 ret = abx500_set_register_interruptible(di->dev, AB8500_GAS_GAUGE,
722 AB8500_GASG_CC_NCOV_ACCU_CTRL, RD_NCONV_ACCU_REQ);
723 if (ret)
724 goto exit;
725
726 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
727 AB8500_GASG_CC_NCOV_ACCU_LOW, &low);
728 if (ret < 0)
729 goto exit;
730
731 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
732 AB8500_GASG_CC_NCOV_ACCU_MED, &med);
733 if (ret < 0)
734 goto exit;
735
736 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
737 AB8500_GASG_CC_NCOV_ACCU_HIGH, &high);
738 if (ret < 0)
739 goto exit;
740
741 /* Check for sign bit in case of negative value, 2's compliment */
742 if (high & 0x10)
743 val = (low | (med << 8) | (high << 16) | 0xFFE00000);
744 else
745 val = (low | (med << 8) | (high << 16));
746
747 /*
748 * Convert to uAh
749 * Given a 250ms conversion cycle time the LSB corresponds
750 * to 112.9 nAh.
751 * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm
752 */
753 di->accu_charge = (val * QLSB_NANO_AMP_HOURS_X10) /
754 (100 * di->bat->fg_res);
755
756 /*
757 * Convert to unit value in mA
758 * Full scale input voltage is
759 * 66.660mV => LSB = 66.660mV/(4096*res) = 1.627mA
760 * Given a 250ms conversion cycle time the LSB corresponds
761 * to 112.9 nAh. Convert to current by dividing by the conversion
762 * time in hours (= samples / (3600 * 4)h)
763 * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm
764 */
765 di->avg_curr = (val * QLSB_NANO_AMP_HOURS_X10 * 36) /
766 (1000 * di->bat->fg_res * (di->fg_samples / 4));
767
768 di->flags.conv_done = true;
769
770 mutex_unlock(&di->cc_lock);
771
772 queue_work(di->fg_wq, &di->fg_work);
773
774 return;
775 exit:
776 dev_err(di->dev,
777 "Failed to read or write gas gauge registers\n");
778 mutex_unlock(&di->cc_lock);
779 queue_work(di->fg_wq, &di->fg_work);
780 }
781
782 /**
783 * ab8500_fg_bat_voltage() - get battery voltage
784 * @di: pointer to the ab8500_fg structure
785 *
786 * Returns battery voltage(on success) else error code
787 */
788 static int ab8500_fg_bat_voltage(struct ab8500_fg *di)
789 {
790 int vbat;
791 static int prev;
792
793 vbat = ab8500_gpadc_convert(di->gpadc, MAIN_BAT_V);
794 if (vbat < 0) {
795 dev_err(di->dev,
796 "%s gpadc conversion failed, using previous value\n",
797 __func__);
798 return prev;
799 }
800
801 prev = vbat;
802 return vbat;
803 }
804
805 /**
806 * ab8500_fg_volt_to_capacity() - Voltage based capacity
807 * @di: pointer to the ab8500_fg structure
808 * @voltage: The voltage to convert to a capacity
809 *
810 * Returns battery capacity in per mille based on voltage
811 */
812 static int ab8500_fg_volt_to_capacity(struct ab8500_fg *di, int voltage)
813 {
814 int i, tbl_size;
815 struct abx500_v_to_cap *tbl;
816 int cap = 0;
817
818 tbl = di->bat->bat_type[di->bat->batt_id].v_to_cap_tbl,
819 tbl_size = di->bat->bat_type[di->bat->batt_id].n_v_cap_tbl_elements;
820
821 for (i = 0; i < tbl_size; ++i) {
822 if (voltage > tbl[i].voltage)
823 break;
824 }
825
826 if ((i > 0) && (i < tbl_size)) {
827 cap = interpolate(voltage,
828 tbl[i].voltage,
829 tbl[i].capacity * 10,
830 tbl[i-1].voltage,
831 tbl[i-1].capacity * 10);
832 } else if (i == 0) {
833 cap = 1000;
834 } else {
835 cap = 0;
836 }
837
838 dev_dbg(di->dev, "%s Vbat: %d, Cap: %d per mille",
839 __func__, voltage, cap);
840
841 return cap;
842 }
843
844 /**
845 * ab8500_fg_uncomp_volt_to_capacity() - Uncompensated voltage based capacity
846 * @di: pointer to the ab8500_fg structure
847 *
848 * Returns battery capacity based on battery voltage that is not compensated
849 * for the voltage drop due to the load
850 */
851 static int ab8500_fg_uncomp_volt_to_capacity(struct ab8500_fg *di)
852 {
853 di->vbat = ab8500_fg_bat_voltage(di);
854 return ab8500_fg_volt_to_capacity(di, di->vbat);
855 }
856
857 /**
858 * ab8500_fg_battery_resistance() - Returns the battery inner resistance
859 * @di: pointer to the ab8500_fg structure
860 *
861 * Returns battery inner resistance added with the fuel gauge resistor value
862 * to get the total resistance in the whole link from gnd to bat+ node.
863 */
864 static int ab8500_fg_battery_resistance(struct ab8500_fg *di)
865 {
866 int i, tbl_size;
867 struct batres_vs_temp *tbl;
868 int resist = 0;
869
870 tbl = di->bat->bat_type[di->bat->batt_id].batres_tbl;
871 tbl_size = di->bat->bat_type[di->bat->batt_id].n_batres_tbl_elements;
872
873 for (i = 0; i < tbl_size; ++i) {
874 if (di->bat_temp / 10 > tbl[i].temp)
875 break;
876 }
877
878 if ((i > 0) && (i < tbl_size)) {
879 resist = interpolate(di->bat_temp / 10,
880 tbl[i].temp,
881 tbl[i].resist,
882 tbl[i-1].temp,
883 tbl[i-1].resist);
884 } else if (i == 0) {
885 resist = tbl[0].resist;
886 } else {
887 resist = tbl[tbl_size - 1].resist;
888 }
889
890 dev_dbg(di->dev, "%s Temp: %d battery internal resistance: %d"
891 " fg resistance %d, total: %d (mOhm)\n",
892 __func__, di->bat_temp, resist, di->bat->fg_res / 10,
893 (di->bat->fg_res / 10) + resist);
894
895 /* fg_res variable is in 0.1mOhm */
896 resist += di->bat->fg_res / 10;
897
898 return resist;
899 }
900
901 /**
902 * ab8500_fg_load_comp_volt_to_capacity() - Load compensated voltage based capacity
903 * @di: pointer to the ab8500_fg structure
904 *
905 * Returns battery capacity based on battery voltage that is load compensated
906 * for the voltage drop
907 */
908 static int ab8500_fg_load_comp_volt_to_capacity(struct ab8500_fg *di)
909 {
910 int vbat_comp, res;
911 int i = 0;
912 int vbat = 0;
913
914 ab8500_fg_inst_curr_start(di);
915
916 do {
917 vbat += ab8500_fg_bat_voltage(di);
918 i++;
919 msleep(5);
920 } while (!ab8500_fg_inst_curr_done(di));
921
922 ab8500_fg_inst_curr_finalize(di, &di->inst_curr);
923
924 di->vbat = vbat / i;
925 res = ab8500_fg_battery_resistance(di);
926
927 /* Use Ohms law to get the load compensated voltage */
928 vbat_comp = di->vbat - (di->inst_curr * res) / 1000;
929
930 dev_dbg(di->dev, "%s Measured Vbat: %dmV,Compensated Vbat %dmV, "
931 "R: %dmOhm, Current: %dmA Vbat Samples: %d\n",
932 __func__, di->vbat, vbat_comp, res, di->inst_curr, i);
933
934 return ab8500_fg_volt_to_capacity(di, vbat_comp);
935 }
936
937 /**
938 * ab8500_fg_convert_mah_to_permille() - Capacity in mAh to permille
939 * @di: pointer to the ab8500_fg structure
940 * @cap_mah: capacity in mAh
941 *
942 * Converts capacity in mAh to capacity in permille
943 */
944 static int ab8500_fg_convert_mah_to_permille(struct ab8500_fg *di, int cap_mah)
945 {
946 return (cap_mah * 1000) / di->bat_cap.max_mah_design;
947 }
948
949 /**
950 * ab8500_fg_convert_permille_to_mah() - Capacity in permille to mAh
951 * @di: pointer to the ab8500_fg structure
952 * @cap_pm: capacity in permille
953 *
954 * Converts capacity in permille to capacity in mAh
955 */
956 static int ab8500_fg_convert_permille_to_mah(struct ab8500_fg *di, int cap_pm)
957 {
958 return cap_pm * di->bat_cap.max_mah_design / 1000;
959 }
960
961 /**
962 * ab8500_fg_convert_mah_to_uwh() - Capacity in mAh to uWh
963 * @di: pointer to the ab8500_fg structure
964 * @cap_mah: capacity in mAh
965 *
966 * Converts capacity in mAh to capacity in uWh
967 */
968 static int ab8500_fg_convert_mah_to_uwh(struct ab8500_fg *di, int cap_mah)
969 {
970 u64 div_res;
971 u32 div_rem;
972
973 div_res = ((u64) cap_mah) * ((u64) di->vbat_nom);
974 div_rem = do_div(div_res, 1000);
975
976 /* Make sure to round upwards if necessary */
977 if (div_rem >= 1000 / 2)
978 div_res++;
979
980 return (int) div_res;
981 }
982
983 /**
984 * ab8500_fg_calc_cap_charging() - Calculate remaining capacity while charging
985 * @di: pointer to the ab8500_fg structure
986 *
987 * Return the capacity in mAh based on previous calculated capcity and the FG
988 * accumulator register value. The filter is filled with this capacity
989 */
990 static int ab8500_fg_calc_cap_charging(struct ab8500_fg *di)
991 {
992 dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n",
993 __func__,
994 di->bat_cap.mah,
995 di->accu_charge);
996
997 /* Capacity should not be less than 0 */
998 if (di->bat_cap.mah + di->accu_charge > 0)
999 di->bat_cap.mah += di->accu_charge;
1000 else
1001 di->bat_cap.mah = 0;
1002 /*
1003 * We force capacity to 100% once when the algorithm
1004 * reports that it's full.
1005 */
1006 if (di->bat_cap.mah >= di->bat_cap.max_mah_design ||
1007 di->flags.force_full) {
1008 di->bat_cap.mah = di->bat_cap.max_mah_design;
1009 }
1010
1011 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1012 di->bat_cap.permille =
1013 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1014
1015 /* We need to update battery voltage and inst current when charging */
1016 di->vbat = ab8500_fg_bat_voltage(di);
1017 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1018
1019 return di->bat_cap.mah;
1020 }
1021
1022 /**
1023 * ab8500_fg_calc_cap_discharge_voltage() - Capacity in discharge with voltage
1024 * @di: pointer to the ab8500_fg structure
1025 * @comp: if voltage should be load compensated before capacity calc
1026 *
1027 * Return the capacity in mAh based on the battery voltage. The voltage can
1028 * either be load compensated or not. This value is added to the filter and a
1029 * new mean value is calculated and returned.
1030 */
1031 static int ab8500_fg_calc_cap_discharge_voltage(struct ab8500_fg *di, bool comp)
1032 {
1033 int permille, mah;
1034
1035 if (comp)
1036 permille = ab8500_fg_load_comp_volt_to_capacity(di);
1037 else
1038 permille = ab8500_fg_uncomp_volt_to_capacity(di);
1039
1040 mah = ab8500_fg_convert_permille_to_mah(di, permille);
1041
1042 di->bat_cap.mah = ab8500_fg_add_cap_sample(di, mah);
1043 di->bat_cap.permille =
1044 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1045
1046 return di->bat_cap.mah;
1047 }
1048
1049 /**
1050 * ab8500_fg_calc_cap_discharge_fg() - Capacity in discharge with FG
1051 * @di: pointer to the ab8500_fg structure
1052 *
1053 * Return the capacity in mAh based on previous calculated capcity and the FG
1054 * accumulator register value. This value is added to the filter and a
1055 * new mean value is calculated and returned.
1056 */
1057 static int ab8500_fg_calc_cap_discharge_fg(struct ab8500_fg *di)
1058 {
1059 int permille_volt, permille;
1060
1061 dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n",
1062 __func__,
1063 di->bat_cap.mah,
1064 di->accu_charge);
1065
1066 /* Capacity should not be less than 0 */
1067 if (di->bat_cap.mah + di->accu_charge > 0)
1068 di->bat_cap.mah += di->accu_charge;
1069 else
1070 di->bat_cap.mah = 0;
1071
1072 if (di->bat_cap.mah >= di->bat_cap.max_mah_design)
1073 di->bat_cap.mah = di->bat_cap.max_mah_design;
1074
1075 /*
1076 * Check against voltage based capacity. It can not be lower
1077 * than what the uncompensated voltage says
1078 */
1079 permille = ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1080 permille_volt = ab8500_fg_uncomp_volt_to_capacity(di);
1081
1082 if (permille < permille_volt) {
1083 di->bat_cap.permille = permille_volt;
1084 di->bat_cap.mah = ab8500_fg_convert_permille_to_mah(di,
1085 di->bat_cap.permille);
1086
1087 dev_dbg(di->dev, "%s voltage based: perm %d perm_volt %d\n",
1088 __func__,
1089 permille,
1090 permille_volt);
1091
1092 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1093 } else {
1094 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1095 di->bat_cap.permille =
1096 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1097 }
1098
1099 return di->bat_cap.mah;
1100 }
1101
1102 /**
1103 * ab8500_fg_capacity_level() - Get the battery capacity level
1104 * @di: pointer to the ab8500_fg structure
1105 *
1106 * Get the battery capacity level based on the capacity in percent
1107 */
1108 static int ab8500_fg_capacity_level(struct ab8500_fg *di)
1109 {
1110 int ret, percent;
1111
1112 percent = di->bat_cap.permille / 10;
1113
1114 if (percent <= di->bat->cap_levels->critical ||
1115 di->flags.low_bat)
1116 ret = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
1117 else if (percent <= di->bat->cap_levels->low)
1118 ret = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
1119 else if (percent <= di->bat->cap_levels->normal)
1120 ret = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
1121 else if (percent <= di->bat->cap_levels->high)
1122 ret = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
1123 else
1124 ret = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
1125
1126 return ret;
1127 }
1128
1129 /**
1130 * ab8500_fg_check_capacity_limits() - Check if capacity has changed
1131 * @di: pointer to the ab8500_fg structure
1132 * @init: capacity is allowed to go up in init mode
1133 *
1134 * Check if capacity or capacity limit has changed and notify the system
1135 * about it using the power_supply framework
1136 */
1137 static void ab8500_fg_check_capacity_limits(struct ab8500_fg *di, bool init)
1138 {
1139 bool changed = false;
1140
1141 di->bat_cap.level = ab8500_fg_capacity_level(di);
1142
1143 if (di->bat_cap.level != di->bat_cap.prev_level) {
1144 /*
1145 * We do not allow reported capacity level to go up
1146 * unless we're charging or if we're in init
1147 */
1148 if (!(!di->flags.charging && di->bat_cap.level >
1149 di->bat_cap.prev_level) || init) {
1150 dev_dbg(di->dev, "level changed from %d to %d\n",
1151 di->bat_cap.prev_level,
1152 di->bat_cap.level);
1153 di->bat_cap.prev_level = di->bat_cap.level;
1154 changed = true;
1155 } else {
1156 dev_dbg(di->dev, "level not allowed to go up "
1157 "since no charger is connected: %d to %d\n",
1158 di->bat_cap.prev_level,
1159 di->bat_cap.level);
1160 }
1161 }
1162
1163 /*
1164 * If we have received the LOW_BAT IRQ, set capacity to 0 to initiate
1165 * shutdown
1166 */
1167 if (di->flags.low_bat) {
1168 dev_dbg(di->dev, "Battery low, set capacity to 0\n");
1169 di->bat_cap.prev_percent = 0;
1170 di->bat_cap.permille = 0;
1171 di->bat_cap.prev_mah = 0;
1172 di->bat_cap.mah = 0;
1173 changed = true;
1174 } else if (di->flags.fully_charged) {
1175 /*
1176 * We report 100% if algorithm reported fully charged
1177 * unless capacity drops too much
1178 */
1179 if (di->flags.force_full) {
1180 di->bat_cap.prev_percent = di->bat_cap.permille / 10;
1181 di->bat_cap.prev_mah = di->bat_cap.mah;
1182 } else if (!di->flags.force_full &&
1183 di->bat_cap.prev_percent !=
1184 (di->bat_cap.permille) / 10 &&
1185 (di->bat_cap.permille / 10) <
1186 di->bat->fg_params->maint_thres) {
1187 dev_dbg(di->dev,
1188 "battery reported full "
1189 "but capacity dropping: %d\n",
1190 di->bat_cap.permille / 10);
1191 di->bat_cap.prev_percent = di->bat_cap.permille / 10;
1192 di->bat_cap.prev_mah = di->bat_cap.mah;
1193
1194 changed = true;
1195 }
1196 } else if (di->bat_cap.prev_percent != di->bat_cap.permille / 10) {
1197 if (di->bat_cap.permille / 10 == 0) {
1198 /*
1199 * We will not report 0% unless we've got
1200 * the LOW_BAT IRQ, no matter what the FG
1201 * algorithm says.
1202 */
1203 di->bat_cap.prev_percent = 1;
1204 di->bat_cap.permille = 1;
1205 di->bat_cap.prev_mah = 1;
1206 di->bat_cap.mah = 1;
1207
1208 changed = true;
1209 } else if (!(!di->flags.charging &&
1210 (di->bat_cap.permille / 10) >
1211 di->bat_cap.prev_percent) || init) {
1212 /*
1213 * We do not allow reported capacity to go up
1214 * unless we're charging or if we're in init
1215 */
1216 dev_dbg(di->dev,
1217 "capacity changed from %d to %d (%d)\n",
1218 di->bat_cap.prev_percent,
1219 di->bat_cap.permille / 10,
1220 di->bat_cap.permille);
1221 di->bat_cap.prev_percent = di->bat_cap.permille / 10;
1222 di->bat_cap.prev_mah = di->bat_cap.mah;
1223
1224 changed = true;
1225 } else {
1226 dev_dbg(di->dev, "capacity not allowed to go up since "
1227 "no charger is connected: %d to %d (%d)\n",
1228 di->bat_cap.prev_percent,
1229 di->bat_cap.permille / 10,
1230 di->bat_cap.permille);
1231 }
1232 }
1233
1234 if (changed) {
1235 power_supply_changed(&di->fg_psy);
1236 if (di->flags.fully_charged && di->flags.force_full) {
1237 dev_dbg(di->dev, "Battery full, notifying.\n");
1238 di->flags.force_full = false;
1239 sysfs_notify(&di->fg_kobject, NULL, "charge_full");
1240 }
1241 sysfs_notify(&di->fg_kobject, NULL, "charge_now");
1242 }
1243 }
1244
1245 static void ab8500_fg_charge_state_to(struct ab8500_fg *di,
1246 enum ab8500_fg_charge_state new_state)
1247 {
1248 dev_dbg(di->dev, "Charge state from %d [%s] to %d [%s]\n",
1249 di->charge_state,
1250 charge_state[di->charge_state],
1251 new_state,
1252 charge_state[new_state]);
1253
1254 di->charge_state = new_state;
1255 }
1256
1257 static void ab8500_fg_discharge_state_to(struct ab8500_fg *di,
1258 enum ab8500_fg_discharge_state new_state)
1259 {
1260 dev_dbg(di->dev, "Disharge state from %d [%s] to %d [%s]\n",
1261 di->discharge_state,
1262 discharge_state[di->discharge_state],
1263 new_state,
1264 discharge_state[new_state]);
1265
1266 di->discharge_state = new_state;
1267 }
1268
1269 /**
1270 * ab8500_fg_algorithm_charging() - FG algorithm for when charging
1271 * @di: pointer to the ab8500_fg structure
1272 *
1273 * Battery capacity calculation state machine for when we're charging
1274 */
1275 static void ab8500_fg_algorithm_charging(struct ab8500_fg *di)
1276 {
1277 /*
1278 * If we change to discharge mode
1279 * we should start with recovery
1280 */
1281 if (di->discharge_state != AB8500_FG_DISCHARGE_INIT_RECOVERY)
1282 ab8500_fg_discharge_state_to(di,
1283 AB8500_FG_DISCHARGE_INIT_RECOVERY);
1284
1285 switch (di->charge_state) {
1286 case AB8500_FG_CHARGE_INIT:
1287 di->fg_samples = SEC_TO_SAMPLE(
1288 di->bat->fg_params->accu_charging);
1289
1290 ab8500_fg_coulomb_counter(di, true);
1291 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_READOUT);
1292
1293 break;
1294
1295 case AB8500_FG_CHARGE_READOUT:
1296 /*
1297 * Read the FG and calculate the new capacity
1298 */
1299 mutex_lock(&di->cc_lock);
1300 if (!di->flags.conv_done) {
1301 /* Wasn't the CC IRQ that got us here */
1302 mutex_unlock(&di->cc_lock);
1303 dev_dbg(di->dev, "%s CC conv not done\n",
1304 __func__);
1305
1306 break;
1307 }
1308 di->flags.conv_done = false;
1309 mutex_unlock(&di->cc_lock);
1310
1311 ab8500_fg_calc_cap_charging(di);
1312
1313 break;
1314
1315 default:
1316 break;
1317 }
1318
1319 /* Check capacity limits */
1320 ab8500_fg_check_capacity_limits(di, false);
1321 }
1322
1323 static void force_capacity(struct ab8500_fg *di)
1324 {
1325 int cap;
1326
1327 ab8500_fg_clear_cap_samples(di);
1328 cap = di->bat_cap.user_mah;
1329 if (cap > di->bat_cap.max_mah_design) {
1330 dev_dbg(di->dev, "Remaining cap %d can't be bigger than total"
1331 " %d\n", cap, di->bat_cap.max_mah_design);
1332 cap = di->bat_cap.max_mah_design;
1333 }
1334 ab8500_fg_fill_cap_sample(di, di->bat_cap.user_mah);
1335 di->bat_cap.permille = ab8500_fg_convert_mah_to_permille(di, cap);
1336 di->bat_cap.mah = cap;
1337 ab8500_fg_check_capacity_limits(di, true);
1338 }
1339
1340 static bool check_sysfs_capacity(struct ab8500_fg *di)
1341 {
1342 int cap, lower, upper;
1343 int cap_permille;
1344
1345 cap = di->bat_cap.user_mah;
1346
1347 cap_permille = ab8500_fg_convert_mah_to_permille(di,
1348 di->bat_cap.user_mah);
1349
1350 lower = di->bat_cap.permille - di->bat->fg_params->user_cap_limit * 10;
1351 upper = di->bat_cap.permille + di->bat->fg_params->user_cap_limit * 10;
1352
1353 if (lower < 0)
1354 lower = 0;
1355 /* 1000 is permille, -> 100 percent */
1356 if (upper > 1000)
1357 upper = 1000;
1358
1359 dev_dbg(di->dev, "Capacity limits:"
1360 " (Lower: %d User: %d Upper: %d) [user: %d, was: %d]\n",
1361 lower, cap_permille, upper, cap, di->bat_cap.mah);
1362
1363 /* If within limits, use the saved capacity and exit estimation...*/
1364 if (cap_permille > lower && cap_permille < upper) {
1365 dev_dbg(di->dev, "OK! Using users cap %d uAh now\n", cap);
1366 force_capacity(di);
1367 return true;
1368 }
1369 dev_dbg(di->dev, "Capacity from user out of limits, ignoring");
1370 return false;
1371 }
1372
1373 /**
1374 * ab8500_fg_algorithm_discharging() - FG algorithm for when discharging
1375 * @di: pointer to the ab8500_fg structure
1376 *
1377 * Battery capacity calculation state machine for when we're discharging
1378 */
1379 static void ab8500_fg_algorithm_discharging(struct ab8500_fg *di)
1380 {
1381 int sleep_time;
1382
1383 /* If we change to charge mode we should start with init */
1384 if (di->charge_state != AB8500_FG_CHARGE_INIT)
1385 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
1386
1387 switch (di->discharge_state) {
1388 case AB8500_FG_DISCHARGE_INIT:
1389 /* We use the FG IRQ to work on */
1390 di->init_cnt = 0;
1391 di->fg_samples = SEC_TO_SAMPLE(di->bat->fg_params->init_timer);
1392 ab8500_fg_coulomb_counter(di, true);
1393 ab8500_fg_discharge_state_to(di,
1394 AB8500_FG_DISCHARGE_INITMEASURING);
1395
1396 /* Intentional fallthrough */
1397 case AB8500_FG_DISCHARGE_INITMEASURING:
1398 /*
1399 * Discard a number of samples during startup.
1400 * After that, use compensated voltage for a few
1401 * samples to get an initial capacity.
1402 * Then go to READOUT
1403 */
1404 sleep_time = di->bat->fg_params->init_timer;
1405
1406 /* Discard the first [x] seconds */
1407 if (di->init_cnt >
1408 di->bat->fg_params->init_discard_time) {
1409 ab8500_fg_calc_cap_discharge_voltage(di, true);
1410
1411 ab8500_fg_check_capacity_limits(di, true);
1412 }
1413
1414 di->init_cnt += sleep_time;
1415 if (di->init_cnt > di->bat->fg_params->init_total_time)
1416 ab8500_fg_discharge_state_to(di,
1417 AB8500_FG_DISCHARGE_READOUT_INIT);
1418
1419 break;
1420
1421 case AB8500_FG_DISCHARGE_INIT_RECOVERY:
1422 di->recovery_cnt = 0;
1423 di->recovery_needed = true;
1424 ab8500_fg_discharge_state_to(di,
1425 AB8500_FG_DISCHARGE_RECOVERY);
1426
1427 /* Intentional fallthrough */
1428
1429 case AB8500_FG_DISCHARGE_RECOVERY:
1430 sleep_time = di->bat->fg_params->recovery_sleep_timer;
1431
1432 /*
1433 * We should check the power consumption
1434 * If low, go to READOUT (after x min) or
1435 * RECOVERY_SLEEP if time left.
1436 * If high, go to READOUT
1437 */
1438 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1439
1440 if (ab8500_fg_is_low_curr(di, di->inst_curr)) {
1441 if (di->recovery_cnt >
1442 di->bat->fg_params->recovery_total_time) {
1443 di->fg_samples = SEC_TO_SAMPLE(
1444 di->bat->fg_params->accu_high_curr);
1445 ab8500_fg_coulomb_counter(di, true);
1446 ab8500_fg_discharge_state_to(di,
1447 AB8500_FG_DISCHARGE_READOUT);
1448 di->recovery_needed = false;
1449 } else {
1450 queue_delayed_work(di->fg_wq,
1451 &di->fg_periodic_work,
1452 sleep_time * HZ);
1453 }
1454 di->recovery_cnt += sleep_time;
1455 } else {
1456 di->fg_samples = SEC_TO_SAMPLE(
1457 di->bat->fg_params->accu_high_curr);
1458 ab8500_fg_coulomb_counter(di, true);
1459 ab8500_fg_discharge_state_to(di,
1460 AB8500_FG_DISCHARGE_READOUT);
1461 }
1462 break;
1463
1464 case AB8500_FG_DISCHARGE_READOUT_INIT:
1465 di->fg_samples = SEC_TO_SAMPLE(
1466 di->bat->fg_params->accu_high_curr);
1467 ab8500_fg_coulomb_counter(di, true);
1468 ab8500_fg_discharge_state_to(di,
1469 AB8500_FG_DISCHARGE_READOUT);
1470 break;
1471
1472 case AB8500_FG_DISCHARGE_READOUT:
1473 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1474
1475 if (ab8500_fg_is_low_curr(di, di->inst_curr)) {
1476 /* Detect mode change */
1477 if (di->high_curr_mode) {
1478 di->high_curr_mode = false;
1479 di->high_curr_cnt = 0;
1480 }
1481
1482 if (di->recovery_needed) {
1483 ab8500_fg_discharge_state_to(di,
1484 AB8500_FG_DISCHARGE_RECOVERY);
1485
1486 queue_delayed_work(di->fg_wq,
1487 &di->fg_periodic_work, 0);
1488
1489 break;
1490 }
1491
1492 ab8500_fg_calc_cap_discharge_voltage(di, true);
1493 } else {
1494 mutex_lock(&di->cc_lock);
1495 if (!di->flags.conv_done) {
1496 /* Wasn't the CC IRQ that got us here */
1497 mutex_unlock(&di->cc_lock);
1498 dev_dbg(di->dev, "%s CC conv not done\n",
1499 __func__);
1500
1501 break;
1502 }
1503 di->flags.conv_done = false;
1504 mutex_unlock(&di->cc_lock);
1505
1506 /* Detect mode change */
1507 if (!di->high_curr_mode) {
1508 di->high_curr_mode = true;
1509 di->high_curr_cnt = 0;
1510 }
1511
1512 di->high_curr_cnt +=
1513 di->bat->fg_params->accu_high_curr;
1514 if (di->high_curr_cnt >
1515 di->bat->fg_params->high_curr_time)
1516 di->recovery_needed = true;
1517
1518 ab8500_fg_calc_cap_discharge_fg(di);
1519 }
1520
1521 ab8500_fg_check_capacity_limits(di, false);
1522
1523 break;
1524
1525 case AB8500_FG_DISCHARGE_WAKEUP:
1526 ab8500_fg_coulomb_counter(di, true);
1527 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1528
1529 ab8500_fg_calc_cap_discharge_voltage(di, true);
1530
1531 di->fg_samples = SEC_TO_SAMPLE(
1532 di->bat->fg_params->accu_high_curr);
1533 ab8500_fg_coulomb_counter(di, true);
1534 ab8500_fg_discharge_state_to(di,
1535 AB8500_FG_DISCHARGE_READOUT);
1536
1537 ab8500_fg_check_capacity_limits(di, false);
1538
1539 break;
1540
1541 default:
1542 break;
1543 }
1544 }
1545
1546 /**
1547 * ab8500_fg_algorithm_calibrate() - Internal columb counter offset calibration
1548 * @di: pointer to the ab8500_fg structure
1549 *
1550 */
1551 static void ab8500_fg_algorithm_calibrate(struct ab8500_fg *di)
1552 {
1553 int ret;
1554
1555 switch (di->calib_state) {
1556 case AB8500_FG_CALIB_INIT:
1557 dev_dbg(di->dev, "Calibration ongoing...\n");
1558
1559 ret = abx500_mask_and_set_register_interruptible(di->dev,
1560 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1561 CC_INT_CAL_N_AVG_MASK, CC_INT_CAL_SAMPLES_8);
1562 if (ret < 0)
1563 goto err;
1564
1565 ret = abx500_mask_and_set_register_interruptible(di->dev,
1566 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1567 CC_INTAVGOFFSET_ENA, CC_INTAVGOFFSET_ENA);
1568 if (ret < 0)
1569 goto err;
1570 di->calib_state = AB8500_FG_CALIB_WAIT;
1571 break;
1572 case AB8500_FG_CALIB_END:
1573 ret = abx500_mask_and_set_register_interruptible(di->dev,
1574 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1575 CC_MUXOFFSET, CC_MUXOFFSET);
1576 if (ret < 0)
1577 goto err;
1578 di->flags.calibrate = false;
1579 dev_dbg(di->dev, "Calibration done...\n");
1580 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1581 break;
1582 case AB8500_FG_CALIB_WAIT:
1583 dev_dbg(di->dev, "Calibration WFI\n");
1584 default:
1585 break;
1586 }
1587 return;
1588 err:
1589 /* Something went wrong, don't calibrate then */
1590 dev_err(di->dev, "failed to calibrate the CC\n");
1591 di->flags.calibrate = false;
1592 di->calib_state = AB8500_FG_CALIB_INIT;
1593 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1594 }
1595
1596 /**
1597 * ab8500_fg_algorithm() - Entry point for the FG algorithm
1598 * @di: pointer to the ab8500_fg structure
1599 *
1600 * Entry point for the battery capacity calculation state machine
1601 */
1602 static void ab8500_fg_algorithm(struct ab8500_fg *di)
1603 {
1604 if (di->flags.calibrate)
1605 ab8500_fg_algorithm_calibrate(di);
1606 else {
1607 if (di->flags.charging)
1608 ab8500_fg_algorithm_charging(di);
1609 else
1610 ab8500_fg_algorithm_discharging(di);
1611 }
1612
1613 dev_dbg(di->dev, "[FG_DATA] %d %d %d %d %d %d %d %d %d "
1614 "%d %d %d %d %d %d %d\n",
1615 di->bat_cap.max_mah_design,
1616 di->bat_cap.mah,
1617 di->bat_cap.permille,
1618 di->bat_cap.level,
1619 di->bat_cap.prev_mah,
1620 di->bat_cap.prev_percent,
1621 di->bat_cap.prev_level,
1622 di->vbat,
1623 di->inst_curr,
1624 di->avg_curr,
1625 di->accu_charge,
1626 di->flags.charging,
1627 di->charge_state,
1628 di->discharge_state,
1629 di->high_curr_mode,
1630 di->recovery_needed);
1631 }
1632
1633 /**
1634 * ab8500_fg_periodic_work() - Run the FG state machine periodically
1635 * @work: pointer to the work_struct structure
1636 *
1637 * Work queue function for periodic work
1638 */
1639 static void ab8500_fg_periodic_work(struct work_struct *work)
1640 {
1641 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1642 fg_periodic_work.work);
1643
1644 if (di->init_capacity) {
1645 /* A dummy read that will return 0 */
1646 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1647 /* Get an initial capacity calculation */
1648 ab8500_fg_calc_cap_discharge_voltage(di, true);
1649 ab8500_fg_check_capacity_limits(di, true);
1650 di->init_capacity = false;
1651
1652 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1653 } else if (di->flags.user_cap) {
1654 if (check_sysfs_capacity(di)) {
1655 ab8500_fg_check_capacity_limits(di, true);
1656 if (di->flags.charging)
1657 ab8500_fg_charge_state_to(di,
1658 AB8500_FG_CHARGE_INIT);
1659 else
1660 ab8500_fg_discharge_state_to(di,
1661 AB8500_FG_DISCHARGE_READOUT_INIT);
1662 }
1663 di->flags.user_cap = false;
1664 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1665 } else
1666 ab8500_fg_algorithm(di);
1667
1668 }
1669
1670 /**
1671 * ab8500_fg_check_hw_failure_work() - Check OVV_BAT condition
1672 * @work: pointer to the work_struct structure
1673 *
1674 * Work queue function for checking the OVV_BAT condition
1675 */
1676 static void ab8500_fg_check_hw_failure_work(struct work_struct *work)
1677 {
1678 int ret;
1679 u8 reg_value;
1680
1681 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1682 fg_check_hw_failure_work.work);
1683
1684 /*
1685 * If we have had a battery over-voltage situation,
1686 * check ovv-bit to see if it should be reset.
1687 */
1688 if (di->flags.bat_ovv) {
1689 ret = abx500_get_register_interruptible(di->dev,
1690 AB8500_CHARGER, AB8500_CH_STAT_REG,
1691 &reg_value);
1692 if (ret < 0) {
1693 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1694 return;
1695 }
1696 if ((reg_value & BATT_OVV) != BATT_OVV) {
1697 dev_dbg(di->dev, "Battery recovered from OVV\n");
1698 di->flags.bat_ovv = false;
1699 power_supply_changed(&di->fg_psy);
1700 return;
1701 }
1702
1703 /* Not yet recovered from ovv, reschedule this test */
1704 queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work,
1705 round_jiffies(HZ));
1706 }
1707 }
1708
1709 /**
1710 * ab8500_fg_low_bat_work() - Check LOW_BAT condition
1711 * @work: pointer to the work_struct structure
1712 *
1713 * Work queue function for checking the LOW_BAT condition
1714 */
1715 static void ab8500_fg_low_bat_work(struct work_struct *work)
1716 {
1717 int vbat;
1718
1719 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1720 fg_low_bat_work.work);
1721
1722 vbat = ab8500_fg_bat_voltage(di);
1723
1724 /* Check if LOW_BAT still fulfilled */
1725 if (vbat < di->bat->fg_params->lowbat_threshold) {
1726 di->flags.low_bat = true;
1727 dev_warn(di->dev, "Battery voltage still LOW\n");
1728
1729 /*
1730 * We need to re-schedule this check to be able to detect
1731 * if the voltage increases again during charging
1732 */
1733 queue_delayed_work(di->fg_wq, &di->fg_low_bat_work,
1734 round_jiffies(LOW_BAT_CHECK_INTERVAL));
1735 } else {
1736 di->flags.low_bat = false;
1737 dev_warn(di->dev, "Battery voltage OK again\n");
1738 }
1739
1740 /* This is needed to dispatch LOW_BAT */
1741 ab8500_fg_check_capacity_limits(di, false);
1742
1743 /* Set this flag to check if LOW_BAT IRQ still occurs */
1744 di->flags.low_bat_delay = false;
1745 }
1746
1747 /**
1748 * ab8500_fg_battok_calc - calculate the bit pattern corresponding
1749 * to the target voltage.
1750 * @di: pointer to the ab8500_fg structure
1751 * @target target voltage
1752 *
1753 * Returns bit pattern closest to the target voltage
1754 * valid return values are 0-14. (0-BATT_OK_MAX_NR_INCREMENTS)
1755 */
1756
1757 static int ab8500_fg_battok_calc(struct ab8500_fg *di, int target)
1758 {
1759 if (target > BATT_OK_MIN +
1760 (BATT_OK_INCREMENT * BATT_OK_MAX_NR_INCREMENTS))
1761 return BATT_OK_MAX_NR_INCREMENTS;
1762 if (target < BATT_OK_MIN)
1763 return 0;
1764 return (target - BATT_OK_MIN) / BATT_OK_INCREMENT;
1765 }
1766
1767 /**
1768 * ab8500_fg_battok_init_hw_register - init battok levels
1769 * @di: pointer to the ab8500_fg structure
1770 *
1771 */
1772
1773 static int ab8500_fg_battok_init_hw_register(struct ab8500_fg *di)
1774 {
1775 int selected;
1776 int sel0;
1777 int sel1;
1778 int cbp_sel0;
1779 int cbp_sel1;
1780 int ret;
1781 int new_val;
1782
1783 sel0 = di->bat->fg_params->battok_falling_th_sel0;
1784 sel1 = di->bat->fg_params->battok_raising_th_sel1;
1785
1786 cbp_sel0 = ab8500_fg_battok_calc(di, sel0);
1787 cbp_sel1 = ab8500_fg_battok_calc(di, sel1);
1788
1789 selected = BATT_OK_MIN + cbp_sel0 * BATT_OK_INCREMENT;
1790
1791 if (selected != sel0)
1792 dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n",
1793 sel0, selected, cbp_sel0);
1794
1795 selected = BATT_OK_MIN + cbp_sel1 * BATT_OK_INCREMENT;
1796
1797 if (selected != sel1)
1798 dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n",
1799 sel1, selected, cbp_sel1);
1800
1801 new_val = cbp_sel0 | (cbp_sel1 << 4);
1802
1803 dev_dbg(di->dev, "using: %x %d %d\n", new_val, cbp_sel0, cbp_sel1);
1804 ret = abx500_set_register_interruptible(di->dev, AB8500_SYS_CTRL2_BLOCK,
1805 AB8500_BATT_OK_REG, new_val);
1806 return ret;
1807 }
1808
1809 /**
1810 * ab8500_fg_instant_work() - Run the FG state machine instantly
1811 * @work: pointer to the work_struct structure
1812 *
1813 * Work queue function for instant work
1814 */
1815 static void ab8500_fg_instant_work(struct work_struct *work)
1816 {
1817 struct ab8500_fg *di = container_of(work, struct ab8500_fg, fg_work);
1818
1819 ab8500_fg_algorithm(di);
1820 }
1821
1822 /**
1823 * ab8500_fg_cc_data_end_handler() - isr to get battery avg current.
1824 * @irq: interrupt number
1825 * @_di: pointer to the ab8500_fg structure
1826 *
1827 * Returns IRQ status(IRQ_HANDLED)
1828 */
1829 static irqreturn_t ab8500_fg_cc_data_end_handler(int irq, void *_di)
1830 {
1831 struct ab8500_fg *di = _di;
1832 complete(&di->ab8500_fg_complete);
1833 return IRQ_HANDLED;
1834 }
1835
1836 /**
1837 * ab8500_fg_cc_convend_handler() - isr to get battery avg current.
1838 * @irq: interrupt number
1839 * @_di: pointer to the ab8500_fg structure
1840 *
1841 * Returns IRQ status(IRQ_HANDLED)
1842 */
1843 static irqreturn_t ab8500_fg_cc_int_calib_handler(int irq, void *_di)
1844 {
1845 struct ab8500_fg *di = _di;
1846 di->calib_state = AB8500_FG_CALIB_END;
1847 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1848 return IRQ_HANDLED;
1849 }
1850
1851 /**
1852 * ab8500_fg_cc_convend_handler() - isr to get battery avg current.
1853 * @irq: interrupt number
1854 * @_di: pointer to the ab8500_fg structure
1855 *
1856 * Returns IRQ status(IRQ_HANDLED)
1857 */
1858 static irqreturn_t ab8500_fg_cc_convend_handler(int irq, void *_di)
1859 {
1860 struct ab8500_fg *di = _di;
1861
1862 queue_work(di->fg_wq, &di->fg_acc_cur_work);
1863
1864 return IRQ_HANDLED;
1865 }
1866
1867 /**
1868 * ab8500_fg_batt_ovv_handler() - Battery OVV occured
1869 * @irq: interrupt number
1870 * @_di: pointer to the ab8500_fg structure
1871 *
1872 * Returns IRQ status(IRQ_HANDLED)
1873 */
1874 static irqreturn_t ab8500_fg_batt_ovv_handler(int irq, void *_di)
1875 {
1876 struct ab8500_fg *di = _di;
1877
1878 dev_dbg(di->dev, "Battery OVV\n");
1879 di->flags.bat_ovv = true;
1880 power_supply_changed(&di->fg_psy);
1881
1882 /* Schedule a new HW failure check */
1883 queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work, 0);
1884
1885 return IRQ_HANDLED;
1886 }
1887
1888 /**
1889 * ab8500_fg_lowbatf_handler() - Battery voltage is below LOW threshold
1890 * @irq: interrupt number
1891 * @_di: pointer to the ab8500_fg structure
1892 *
1893 * Returns IRQ status(IRQ_HANDLED)
1894 */
1895 static irqreturn_t ab8500_fg_lowbatf_handler(int irq, void *_di)
1896 {
1897 struct ab8500_fg *di = _di;
1898
1899 if (!di->flags.low_bat_delay) {
1900 dev_warn(di->dev, "Battery voltage is below LOW threshold\n");
1901 di->flags.low_bat_delay = true;
1902 /*
1903 * Start a timer to check LOW_BAT again after some time
1904 * This is done to avoid shutdown on single voltage dips
1905 */
1906 queue_delayed_work(di->fg_wq, &di->fg_low_bat_work,
1907 round_jiffies(LOW_BAT_CHECK_INTERVAL));
1908 }
1909 return IRQ_HANDLED;
1910 }
1911
1912 /**
1913 * ab8500_fg_get_property() - get the fg properties
1914 * @psy: pointer to the power_supply structure
1915 * @psp: pointer to the power_supply_property structure
1916 * @val: pointer to the power_supply_propval union
1917 *
1918 * This function gets called when an application tries to get the
1919 * fg properties by reading the sysfs files.
1920 * voltage_now: battery voltage
1921 * current_now: battery instant current
1922 * current_avg: battery average current
1923 * charge_full_design: capacity where battery is considered full
1924 * charge_now: battery capacity in nAh
1925 * capacity: capacity in percent
1926 * capacity_level: capacity level
1927 *
1928 * Returns error code in case of failure else 0 on success
1929 */
1930 static int ab8500_fg_get_property(struct power_supply *psy,
1931 enum power_supply_property psp,
1932 union power_supply_propval *val)
1933 {
1934 struct ab8500_fg *di;
1935
1936 di = to_ab8500_fg_device_info(psy);
1937
1938 /*
1939 * If battery is identified as unknown and charging of unknown
1940 * batteries is disabled, we always report 100% capacity and
1941 * capacity level UNKNOWN, since we can't calculate
1942 * remaining capacity
1943 */
1944
1945 switch (psp) {
1946 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1947 if (di->flags.bat_ovv)
1948 val->intval = BATT_OVV_VALUE * 1000;
1949 else
1950 val->intval = di->vbat * 1000;
1951 break;
1952 case POWER_SUPPLY_PROP_CURRENT_NOW:
1953 val->intval = di->inst_curr * 1000;
1954 break;
1955 case POWER_SUPPLY_PROP_CURRENT_AVG:
1956 val->intval = di->avg_curr * 1000;
1957 break;
1958 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
1959 val->intval = ab8500_fg_convert_mah_to_uwh(di,
1960 di->bat_cap.max_mah_design);
1961 break;
1962 case POWER_SUPPLY_PROP_ENERGY_FULL:
1963 val->intval = ab8500_fg_convert_mah_to_uwh(di,
1964 di->bat_cap.max_mah);
1965 break;
1966 case POWER_SUPPLY_PROP_ENERGY_NOW:
1967 if (di->flags.batt_unknown && !di->bat->chg_unknown_bat &&
1968 di->flags.batt_id_received)
1969 val->intval = ab8500_fg_convert_mah_to_uwh(di,
1970 di->bat_cap.max_mah);
1971 else
1972 val->intval = ab8500_fg_convert_mah_to_uwh(di,
1973 di->bat_cap.prev_mah);
1974 break;
1975 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
1976 val->intval = di->bat_cap.max_mah_design;
1977 break;
1978 case POWER_SUPPLY_PROP_CHARGE_FULL:
1979 val->intval = di->bat_cap.max_mah;
1980 break;
1981 case POWER_SUPPLY_PROP_CHARGE_NOW:
1982 if (di->flags.batt_unknown && !di->bat->chg_unknown_bat &&
1983 di->flags.batt_id_received)
1984 val->intval = di->bat_cap.max_mah;
1985 else
1986 val->intval = di->bat_cap.prev_mah;
1987 break;
1988 case POWER_SUPPLY_PROP_CAPACITY:
1989 if (di->flags.batt_unknown && !di->bat->chg_unknown_bat &&
1990 di->flags.batt_id_received)
1991 val->intval = 100;
1992 else
1993 val->intval = di->bat_cap.prev_percent;
1994 break;
1995 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
1996 if (di->flags.batt_unknown && !di->bat->chg_unknown_bat &&
1997 di->flags.batt_id_received)
1998 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
1999 else
2000 val->intval = di->bat_cap.prev_level;
2001 break;
2002 default:
2003 return -EINVAL;
2004 }
2005 return 0;
2006 }
2007
2008 static int ab8500_fg_get_ext_psy_data(struct device *dev, void *data)
2009 {
2010 struct power_supply *psy;
2011 struct power_supply *ext;
2012 struct ab8500_fg *di;
2013 union power_supply_propval ret;
2014 int i, j;
2015 bool psy_found = false;
2016
2017 psy = (struct power_supply *)data;
2018 ext = dev_get_drvdata(dev);
2019 di = to_ab8500_fg_device_info(psy);
2020
2021 /*
2022 * For all psy where the name of your driver
2023 * appears in any supplied_to
2024 */
2025 for (i = 0; i < ext->num_supplicants; i++) {
2026 if (!strcmp(ext->supplied_to[i], psy->name))
2027 psy_found = true;
2028 }
2029
2030 if (!psy_found)
2031 return 0;
2032
2033 /* Go through all properties for the psy */
2034 for (j = 0; j < ext->num_properties; j++) {
2035 enum power_supply_property prop;
2036 prop = ext->properties[j];
2037
2038 if (ext->get_property(ext, prop, &ret))
2039 continue;
2040
2041 switch (prop) {
2042 case POWER_SUPPLY_PROP_STATUS:
2043 switch (ext->type) {
2044 case POWER_SUPPLY_TYPE_BATTERY:
2045 switch (ret.intval) {
2046 case POWER_SUPPLY_STATUS_UNKNOWN:
2047 case POWER_SUPPLY_STATUS_DISCHARGING:
2048 case POWER_SUPPLY_STATUS_NOT_CHARGING:
2049 if (!di->flags.charging)
2050 break;
2051 di->flags.charging = false;
2052 di->flags.fully_charged = false;
2053 queue_work(di->fg_wq, &di->fg_work);
2054 break;
2055 case POWER_SUPPLY_STATUS_FULL:
2056 if (di->flags.fully_charged)
2057 break;
2058 di->flags.fully_charged = true;
2059 di->flags.force_full = true;
2060 /* Save current capacity as maximum */
2061 di->bat_cap.max_mah = di->bat_cap.mah;
2062 queue_work(di->fg_wq, &di->fg_work);
2063 break;
2064 case POWER_SUPPLY_STATUS_CHARGING:
2065 if (di->flags.charging)
2066 break;
2067 di->flags.charging = true;
2068 di->flags.fully_charged = false;
2069 queue_work(di->fg_wq, &di->fg_work);
2070 break;
2071 };
2072 default:
2073 break;
2074 };
2075 break;
2076 case POWER_SUPPLY_PROP_TECHNOLOGY:
2077 switch (ext->type) {
2078 case POWER_SUPPLY_TYPE_BATTERY:
2079 if (!di->flags.batt_id_received) {
2080 const struct abx500_battery_type *b;
2081
2082 b = &(di->bat->bat_type[di->bat->batt_id]);
2083
2084 di->flags.batt_id_received = true;
2085
2086 di->bat_cap.max_mah_design =
2087 MILLI_TO_MICRO *
2088 b->charge_full_design;
2089
2090 di->bat_cap.max_mah =
2091 di->bat_cap.max_mah_design;
2092
2093 di->vbat_nom = b->nominal_voltage;
2094 }
2095
2096 if (ret.intval)
2097 di->flags.batt_unknown = false;
2098 else
2099 di->flags.batt_unknown = true;
2100 break;
2101 default:
2102 break;
2103 }
2104 break;
2105 case POWER_SUPPLY_PROP_TEMP:
2106 switch (ext->type) {
2107 case POWER_SUPPLY_TYPE_BATTERY:
2108 if (di->flags.batt_id_received)
2109 di->bat_temp = ret.intval;
2110 break;
2111 default:
2112 break;
2113 }
2114 break;
2115 default:
2116 break;
2117 }
2118 }
2119 return 0;
2120 }
2121
2122 /**
2123 * ab8500_fg_init_hw_registers() - Set up FG related registers
2124 * @di: pointer to the ab8500_fg structure
2125 *
2126 * Set up battery OVV, low battery voltage registers
2127 */
2128 static int ab8500_fg_init_hw_registers(struct ab8500_fg *di)
2129 {
2130 int ret;
2131
2132 /* Set VBAT OVV threshold */
2133 ret = abx500_mask_and_set_register_interruptible(di->dev,
2134 AB8500_CHARGER,
2135 AB8500_BATT_OVV,
2136 BATT_OVV_TH_4P75,
2137 BATT_OVV_TH_4P75);
2138 if (ret) {
2139 dev_err(di->dev, "failed to set BATT_OVV\n");
2140 goto out;
2141 }
2142
2143 /* Enable VBAT OVV detection */
2144 ret = abx500_mask_and_set_register_interruptible(di->dev,
2145 AB8500_CHARGER,
2146 AB8500_BATT_OVV,
2147 BATT_OVV_ENA,
2148 BATT_OVV_ENA);
2149 if (ret) {
2150 dev_err(di->dev, "failed to enable BATT_OVV\n");
2151 goto out;
2152 }
2153
2154 /* Low Battery Voltage */
2155 ret = abx500_set_register_interruptible(di->dev,
2156 AB8500_SYS_CTRL2_BLOCK,
2157 AB8500_LOW_BAT_REG,
2158 ab8500_volt_to_regval(
2159 di->bat->fg_params->lowbat_threshold) << 1 |
2160 LOW_BAT_ENABLE);
2161 if (ret) {
2162 dev_err(di->dev, "%s write failed\n", __func__);
2163 goto out;
2164 }
2165
2166 /* Battery OK threshold */
2167 ret = ab8500_fg_battok_init_hw_register(di);
2168 if (ret) {
2169 dev_err(di->dev, "BattOk init write failed.\n");
2170 goto out;
2171 }
2172 out:
2173 return ret;
2174 }
2175
2176 /**
2177 * ab8500_fg_external_power_changed() - callback for power supply changes
2178 * @psy: pointer to the structure power_supply
2179 *
2180 * This function is the entry point of the pointer external_power_changed
2181 * of the structure power_supply.
2182 * This function gets executed when there is a change in any external power
2183 * supply that this driver needs to be notified of.
2184 */
2185 static void ab8500_fg_external_power_changed(struct power_supply *psy)
2186 {
2187 struct ab8500_fg *di = to_ab8500_fg_device_info(psy);
2188
2189 class_for_each_device(power_supply_class, NULL,
2190 &di->fg_psy, ab8500_fg_get_ext_psy_data);
2191 }
2192
2193 /**
2194 * abab8500_fg_reinit_work() - work to reset the FG algorithm
2195 * @work: pointer to the work_struct structure
2196 *
2197 * Used to reset the current battery capacity to be able to
2198 * retrigger a new voltage base capacity calculation. For
2199 * test and verification purpose.
2200 */
2201 static void ab8500_fg_reinit_work(struct work_struct *work)
2202 {
2203 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
2204 fg_reinit_work.work);
2205
2206 if (di->flags.calibrate == false) {
2207 dev_dbg(di->dev, "Resetting FG state machine to init.\n");
2208 ab8500_fg_clear_cap_samples(di);
2209 ab8500_fg_calc_cap_discharge_voltage(di, true);
2210 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
2211 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT);
2212 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2213
2214 } else {
2215 dev_err(di->dev, "Residual offset calibration ongoing "
2216 "retrying..\n");
2217 /* Wait one second until next try*/
2218 queue_delayed_work(di->fg_wq, &di->fg_reinit_work,
2219 round_jiffies(1));
2220 }
2221 }
2222
2223 /**
2224 * ab8500_fg_reinit() - forces FG algorithm to reinitialize with current values
2225 *
2226 * This function can be used to force the FG algorithm to recalculate a new
2227 * voltage based battery capacity.
2228 */
2229 void ab8500_fg_reinit(void)
2230 {
2231 struct ab8500_fg *di = ab8500_fg_get();
2232 /* User won't be notified if a null pointer returned. */
2233 if (di != NULL)
2234 queue_delayed_work(di->fg_wq, &di->fg_reinit_work, 0);
2235 }
2236
2237 /* Exposure to the sysfs interface */
2238
2239 struct ab8500_fg_sysfs_entry {
2240 struct attribute attr;
2241 ssize_t (*show)(struct ab8500_fg *, char *);
2242 ssize_t (*store)(struct ab8500_fg *, const char *, size_t);
2243 };
2244
2245 static ssize_t charge_full_show(struct ab8500_fg *di, char *buf)
2246 {
2247 return sprintf(buf, "%d\n", di->bat_cap.max_mah);
2248 }
2249
2250 static ssize_t charge_full_store(struct ab8500_fg *di, const char *buf,
2251 size_t count)
2252 {
2253 unsigned long charge_full;
2254 ssize_t ret = -EINVAL;
2255
2256 ret = strict_strtoul(buf, 10, &charge_full);
2257
2258 dev_dbg(di->dev, "Ret %zd charge_full %lu", ret, charge_full);
2259
2260 if (!ret) {
2261 di->bat_cap.max_mah = (int) charge_full;
2262 ret = count;
2263 }
2264 return ret;
2265 }
2266
2267 static ssize_t charge_now_show(struct ab8500_fg *di, char *buf)
2268 {
2269 return sprintf(buf, "%d\n", di->bat_cap.prev_mah);
2270 }
2271
2272 static ssize_t charge_now_store(struct ab8500_fg *di, const char *buf,
2273 size_t count)
2274 {
2275 unsigned long charge_now;
2276 ssize_t ret;
2277
2278 ret = strict_strtoul(buf, 10, &charge_now);
2279
2280 dev_dbg(di->dev, "Ret %zd charge_now %lu was %d",
2281 ret, charge_now, di->bat_cap.prev_mah);
2282
2283 if (!ret) {
2284 di->bat_cap.user_mah = (int) charge_now;
2285 di->flags.user_cap = true;
2286 ret = count;
2287 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2288 }
2289 return ret;
2290 }
2291
2292 static struct ab8500_fg_sysfs_entry charge_full_attr =
2293 __ATTR(charge_full, 0644, charge_full_show, charge_full_store);
2294
2295 static struct ab8500_fg_sysfs_entry charge_now_attr =
2296 __ATTR(charge_now, 0644, charge_now_show, charge_now_store);
2297
2298 static ssize_t
2299 ab8500_fg_show(struct kobject *kobj, struct attribute *attr, char *buf)
2300 {
2301 struct ab8500_fg_sysfs_entry *entry;
2302 struct ab8500_fg *di;
2303
2304 entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr);
2305 di = container_of(kobj, struct ab8500_fg, fg_kobject);
2306
2307 if (!entry->show)
2308 return -EIO;
2309
2310 return entry->show(di, buf);
2311 }
2312 static ssize_t
2313 ab8500_fg_store(struct kobject *kobj, struct attribute *attr, const char *buf,
2314 size_t count)
2315 {
2316 struct ab8500_fg_sysfs_entry *entry;
2317 struct ab8500_fg *di;
2318
2319 entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr);
2320 di = container_of(kobj, struct ab8500_fg, fg_kobject);
2321
2322 if (!entry->store)
2323 return -EIO;
2324
2325 return entry->store(di, buf, count);
2326 }
2327
2328 static const struct sysfs_ops ab8500_fg_sysfs_ops = {
2329 .show = ab8500_fg_show,
2330 .store = ab8500_fg_store,
2331 };
2332
2333 static struct attribute *ab8500_fg_attrs[] = {
2334 &charge_full_attr.attr,
2335 &charge_now_attr.attr,
2336 NULL,
2337 };
2338
2339 static struct kobj_type ab8500_fg_ktype = {
2340 .sysfs_ops = &ab8500_fg_sysfs_ops,
2341 .default_attrs = ab8500_fg_attrs,
2342 };
2343
2344 /**
2345 * ab8500_chargalg_sysfs_exit() - de-init of sysfs entry
2346 * @di: pointer to the struct ab8500_chargalg
2347 *
2348 * This function removes the entry in sysfs.
2349 */
2350 static void ab8500_fg_sysfs_exit(struct ab8500_fg *di)
2351 {
2352 kobject_del(&di->fg_kobject);
2353 }
2354
2355 /**
2356 * ab8500_chargalg_sysfs_init() - init of sysfs entry
2357 * @di: pointer to the struct ab8500_chargalg
2358 *
2359 * This function adds an entry in sysfs.
2360 * Returns error code in case of failure else 0(on success)
2361 */
2362 static int ab8500_fg_sysfs_init(struct ab8500_fg *di)
2363 {
2364 int ret = 0;
2365
2366 ret = kobject_init_and_add(&di->fg_kobject,
2367 &ab8500_fg_ktype,
2368 NULL, "battery");
2369 if (ret < 0)
2370 dev_err(di->dev, "failed to create sysfs entry\n");
2371
2372 return ret;
2373 }
2374 /* Exposure to the sysfs interface <<END>> */
2375
2376 #if defined(CONFIG_PM)
2377 static int ab8500_fg_resume(struct platform_device *pdev)
2378 {
2379 struct ab8500_fg *di = platform_get_drvdata(pdev);
2380
2381 /*
2382 * Change state if we're not charging. If we're charging we will wake
2383 * up on the FG IRQ
2384 */
2385 if (!di->flags.charging) {
2386 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_WAKEUP);
2387 queue_work(di->fg_wq, &di->fg_work);
2388 }
2389
2390 return 0;
2391 }
2392
2393 static int ab8500_fg_suspend(struct platform_device *pdev,
2394 pm_message_t state)
2395 {
2396 struct ab8500_fg *di = platform_get_drvdata(pdev);
2397
2398 flush_delayed_work(&di->fg_periodic_work);
2399
2400 /*
2401 * If the FG is enabled we will disable it before going to suspend
2402 * only if we're not charging
2403 */
2404 if (di->flags.fg_enabled && !di->flags.charging)
2405 ab8500_fg_coulomb_counter(di, false);
2406
2407 return 0;
2408 }
2409 #else
2410 #define ab8500_fg_suspend NULL
2411 #define ab8500_fg_resume NULL
2412 #endif
2413
2414 static int __devexit ab8500_fg_remove(struct platform_device *pdev)
2415 {
2416 int ret = 0;
2417 struct ab8500_fg *di = platform_get_drvdata(pdev);
2418
2419 list_del(&di->node);
2420
2421 /* Disable coulomb counter */
2422 ret = ab8500_fg_coulomb_counter(di, false);
2423 if (ret)
2424 dev_err(di->dev, "failed to disable coulomb counter\n");
2425
2426 destroy_workqueue(di->fg_wq);
2427 ab8500_fg_sysfs_exit(di);
2428
2429 flush_scheduled_work();
2430 power_supply_unregister(&di->fg_psy);
2431 platform_set_drvdata(pdev, NULL);
2432 kfree(di);
2433 return ret;
2434 }
2435
2436 /* ab8500 fg driver interrupts and their respective isr */
2437 static struct ab8500_fg_interrupts ab8500_fg_irq[] = {
2438 {"NCONV_ACCU", ab8500_fg_cc_convend_handler},
2439 {"BATT_OVV", ab8500_fg_batt_ovv_handler},
2440 {"LOW_BAT_F", ab8500_fg_lowbatf_handler},
2441 {"CC_INT_CALIB", ab8500_fg_cc_int_calib_handler},
2442 {"CCEOC", ab8500_fg_cc_data_end_handler},
2443 };
2444
2445 static int __devinit ab8500_fg_probe(struct platform_device *pdev)
2446 {
2447 int i, irq;
2448 int ret = 0;
2449 struct abx500_bm_plat_data *plat_data = pdev->dev.platform_data;
2450 struct ab8500_fg *di;
2451
2452 if (!plat_data) {
2453 dev_err(&pdev->dev, "No platform data\n");
2454 return -EINVAL;
2455 }
2456
2457 di = kzalloc(sizeof(*di), GFP_KERNEL);
2458 if (!di)
2459 return -ENOMEM;
2460
2461 mutex_init(&di->cc_lock);
2462
2463 /* get parent data */
2464 di->dev = &pdev->dev;
2465 di->parent = dev_get_drvdata(pdev->dev.parent);
2466 di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
2467
2468 /* get fg specific platform data */
2469 di->pdata = plat_data->fg;
2470 if (!di->pdata) {
2471 dev_err(di->dev, "no fg platform data supplied\n");
2472 ret = -EINVAL;
2473 goto free_device_info;
2474 }
2475
2476 /* get battery specific platform data */
2477 di->bat = plat_data->battery;
2478 if (!di->bat) {
2479 dev_err(di->dev, "no battery platform data supplied\n");
2480 ret = -EINVAL;
2481 goto free_device_info;
2482 }
2483
2484 di->fg_psy.name = "ab8500_fg";
2485 di->fg_psy.type = POWER_SUPPLY_TYPE_BATTERY;
2486 di->fg_psy.properties = ab8500_fg_props;
2487 di->fg_psy.num_properties = ARRAY_SIZE(ab8500_fg_props);
2488 di->fg_psy.get_property = ab8500_fg_get_property;
2489 di->fg_psy.supplied_to = di->pdata->supplied_to;
2490 di->fg_psy.num_supplicants = di->pdata->num_supplicants;
2491 di->fg_psy.external_power_changed = ab8500_fg_external_power_changed;
2492
2493 di->bat_cap.max_mah_design = MILLI_TO_MICRO *
2494 di->bat->bat_type[di->bat->batt_id].charge_full_design;
2495
2496 di->bat_cap.max_mah = di->bat_cap.max_mah_design;
2497
2498 di->vbat_nom = di->bat->bat_type[di->bat->batt_id].nominal_voltage;
2499
2500 di->init_capacity = true;
2501
2502 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
2503 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT);
2504
2505 /* Create a work queue for running the FG algorithm */
2506 di->fg_wq = create_singlethread_workqueue("ab8500_fg_wq");
2507 if (di->fg_wq == NULL) {
2508 dev_err(di->dev, "failed to create work queue\n");
2509 ret = -ENOMEM;
2510 goto free_device_info;
2511 }
2512
2513 /* Init work for running the fg algorithm instantly */
2514 INIT_WORK(&di->fg_work, ab8500_fg_instant_work);
2515
2516 /* Init work for getting the battery accumulated current */
2517 INIT_WORK(&di->fg_acc_cur_work, ab8500_fg_acc_cur_work);
2518
2519 /* Init work for reinitialising the fg algorithm */
2520 INIT_DEFERRABLE_WORK(&di->fg_reinit_work,
2521 ab8500_fg_reinit_work);
2522
2523 /* Work delayed Queue to run the state machine */
2524 INIT_DEFERRABLE_WORK(&di->fg_periodic_work,
2525 ab8500_fg_periodic_work);
2526
2527 /* Work to check low battery condition */
2528 INIT_DEFERRABLE_WORK(&di->fg_low_bat_work,
2529 ab8500_fg_low_bat_work);
2530
2531 /* Init work for HW failure check */
2532 INIT_DEFERRABLE_WORK(&di->fg_check_hw_failure_work,
2533 ab8500_fg_check_hw_failure_work);
2534
2535 /* Initialize OVV, and other registers */
2536 ret = ab8500_fg_init_hw_registers(di);
2537 if (ret) {
2538 dev_err(di->dev, "failed to initialize registers\n");
2539 goto free_inst_curr_wq;
2540 }
2541
2542 /* Consider battery unknown until we're informed otherwise */
2543 di->flags.batt_unknown = true;
2544 di->flags.batt_id_received = false;
2545
2546 /* Register FG power supply class */
2547 ret = power_supply_register(di->dev, &di->fg_psy);
2548 if (ret) {
2549 dev_err(di->dev, "failed to register FG psy\n");
2550 goto free_inst_curr_wq;
2551 }
2552
2553 di->fg_samples = SEC_TO_SAMPLE(di->bat->fg_params->init_timer);
2554 ab8500_fg_coulomb_counter(di, true);
2555
2556 /* Initialize completion used to notify completion of inst current */
2557 init_completion(&di->ab8500_fg_complete);
2558
2559 /* Register interrupts */
2560 for (i = 0; i < ARRAY_SIZE(ab8500_fg_irq); i++) {
2561 irq = platform_get_irq_byname(pdev, ab8500_fg_irq[i].name);
2562 ret = request_threaded_irq(irq, NULL, ab8500_fg_irq[i].isr,
2563 IRQF_SHARED | IRQF_NO_SUSPEND,
2564 ab8500_fg_irq[i].name, di);
2565
2566 if (ret != 0) {
2567 dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
2568 , ab8500_fg_irq[i].name, irq, ret);
2569 goto free_irq;
2570 }
2571 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
2572 ab8500_fg_irq[i].name, irq, ret);
2573 }
2574 di->irq = platform_get_irq_byname(pdev, "CCEOC");
2575 disable_irq(di->irq);
2576
2577 platform_set_drvdata(pdev, di);
2578
2579 ret = ab8500_fg_sysfs_init(di);
2580 if (ret) {
2581 dev_err(di->dev, "failed to create sysfs entry\n");
2582 goto free_irq;
2583 }
2584
2585 /* Calibrate the fg first time */
2586 di->flags.calibrate = true;
2587 di->calib_state = AB8500_FG_CALIB_INIT;
2588
2589 /* Use room temp as default value until we get an update from driver. */
2590 di->bat_temp = 210;
2591
2592 /* Run the FG algorithm */
2593 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2594
2595 list_add_tail(&di->node, &ab8500_fg_list);
2596
2597 return ret;
2598
2599 free_irq:
2600 power_supply_unregister(&di->fg_psy);
2601
2602 /* We also have to free all successfully registered irqs */
2603 for (i = i - 1; i >= 0; i--) {
2604 irq = platform_get_irq_byname(pdev, ab8500_fg_irq[i].name);
2605 free_irq(irq, di);
2606 }
2607 free_inst_curr_wq:
2608 destroy_workqueue(di->fg_wq);
2609 free_device_info:
2610 kfree(di);
2611
2612 return ret;
2613 }
2614
2615 static struct platform_driver ab8500_fg_driver = {
2616 .probe = ab8500_fg_probe,
2617 .remove = __devexit_p(ab8500_fg_remove),
2618 .suspend = ab8500_fg_suspend,
2619 .resume = ab8500_fg_resume,
2620 .driver = {
2621 .name = "ab8500-fg",
2622 .owner = THIS_MODULE,
2623 },
2624 };
2625
2626 static int __init ab8500_fg_init(void)
2627 {
2628 return platform_driver_register(&ab8500_fg_driver);
2629 }
2630
2631 static void __exit ab8500_fg_exit(void)
2632 {
2633 platform_driver_unregister(&ab8500_fg_driver);
2634 }
2635
2636 subsys_initcall_sync(ab8500_fg_init);
2637 module_exit(ab8500_fg_exit);
2638
2639 MODULE_LICENSE("GPL v2");
2640 MODULE_AUTHOR("Johan Palsson, Karl Komierowski");
2641 MODULE_ALIAS("platform:ab8500-fg");
2642 MODULE_DESCRIPTION("AB8500 Fuel Gauge driver");
Linux with added FPC-III support