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/slab.h>
26 #include <linux/delay.h>
27 #include <linux/time.h>
28 #include <linux/time64.h>
29 #include <linux/of.h>
30 #include <linux/completion.h>
31 #include <linux/mfd/core.h>
32 #include <linux/mfd/abx500.h>
33 #include <linux/mfd/abx500/ab8500.h>
34 #include <linux/mfd/abx500/ab8500-bm.h>
35 #include <linux/mfd/abx500/ab8500-gpadc.h>
36 #include <linux/kernel.h>
37
38 #define MILLI_TO_MICRO 1000
39 #define FG_LSB_IN_MA 1627
40 #define QLSB_NANO_AMP_HOURS_X10 1071
41 #define INS_CURR_TIMEOUT (3 * HZ)
42
43 #define SEC_TO_SAMPLE(S) (S * 4)
44
45 #define NBR_AVG_SAMPLES 20
46
47 #define LOW_BAT_CHECK_INTERVAL (HZ / 16) /* 62.5 ms */
48
49 #define VALID_CAPACITY_SEC (45 * 60) /* 45 minutes */
50 #define BATT_OK_MIN 2360 /* mV */
51 #define BATT_OK_INCREMENT 50 /* mV */
52 #define BATT_OK_MAX_NR_INCREMENTS 0xE
53
54 /* FG constants */
55 #define BATT_OVV 0x01
56
57 #define interpolate(x, x1, y1, x2, y2) \
58 ((y1) + ((((y2) - (y1)) * ((x) - (x1))) / ((x2) - (x1))));
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 time64_t time_stamps[NBR_AVG_SAMPLES];
110 int pos;
111 int nbr_samples;
112 int sum;
113 };
114
115 struct ab8500_fg_cap_scaling {
116 bool enable;
117 int cap_to_scale[2];
118 int disable_cap_level;
119 int scaled_cap;
120 };
121
122 struct ab8500_fg_battery_capacity {
123 int max_mah_design;
124 int max_mah;
125 int mah;
126 int permille;
127 int level;
128 int prev_mah;
129 int prev_percent;
130 int prev_level;
131 int user_mah;
132 struct ab8500_fg_cap_scaling cap_scale;
133 };
134
135 struct ab8500_fg_flags {
136 bool fg_enabled;
137 bool conv_done;
138 bool charging;
139 bool fully_charged;
140 bool force_full;
141 bool low_bat_delay;
142 bool low_bat;
143 bool bat_ovv;
144 bool batt_unknown;
145 bool calibrate;
146 bool user_cap;
147 bool batt_id_received;
148 };
149
150 struct inst_curr_result_list {
151 struct list_head list;
152 int *result;
153 };
154
155 /**
156 * struct ab8500_fg - ab8500 FG device information
157 * @dev: Pointer to the structure device
158 * @node: a list of AB8500 FGs, hence prepared for reentrance
159 * @irq holds the CCEOC interrupt number
160 * @vbat: Battery voltage in mV
161 * @vbat_nom: Nominal battery voltage in mV
162 * @inst_curr: Instantenous battery current in mA
163 * @avg_curr: Average battery current in mA
164 * @bat_temp battery temperature
165 * @fg_samples: Number of samples used in the FG accumulation
166 * @accu_charge: Accumulated charge from the last conversion
167 * @recovery_cnt: Counter for recovery mode
168 * @high_curr_cnt: Counter for high current mode
169 * @init_cnt: Counter for init mode
170 * @low_bat_cnt Counter for number of consecutive low battery measures
171 * @nbr_cceoc_irq_cnt Counter for number of CCEOC irqs received since enabled
172 * @recovery_needed: Indicate if recovery is needed
173 * @high_curr_mode: Indicate if we're in high current mode
174 * @init_capacity: Indicate if initial capacity measuring should be done
175 * @turn_off_fg: True if fg was off before current measurement
176 * @calib_state State during offset calibration
177 * @discharge_state: Current discharge state
178 * @charge_state: Current charge state
179 * @ab8500_fg_started Completion struct used for the instant current start
180 * @ab8500_fg_complete Completion struct used for the instant current reading
181 * @flags: Structure for information about events triggered
182 * @bat_cap: Structure for battery capacity specific parameters
183 * @avg_cap: Average capacity filter
184 * @parent: Pointer to the struct ab8500
185 * @gpadc: Pointer to the struct gpadc
186 * @bm: Platform specific battery management information
187 * @fg_psy: Structure that holds the FG specific battery properties
188 * @fg_wq: Work queue for running the FG algorithm
189 * @fg_periodic_work: Work to run the FG algorithm periodically
190 * @fg_low_bat_work: Work to check low bat condition
191 * @fg_reinit_work Work used to reset and reinitialise the FG algorithm
192 * @fg_work: Work to run the FG algorithm instantly
193 * @fg_acc_cur_work: Work to read the FG accumulator
194 * @fg_check_hw_failure_work: Work for checking HW state
195 * @cc_lock: Mutex for locking the CC
196 * @fg_kobject: Structure of type kobject
197 */
198 struct ab8500_fg {
199 struct device *dev;
200 struct list_head node;
201 int irq;
202 int vbat;
203 int vbat_nom;
204 int inst_curr;
205 int avg_curr;
206 int bat_temp;
207 int fg_samples;
208 int accu_charge;
209 int recovery_cnt;
210 int high_curr_cnt;
211 int init_cnt;
212 int low_bat_cnt;
213 int nbr_cceoc_irq_cnt;
214 bool recovery_needed;
215 bool high_curr_mode;
216 bool init_capacity;
217 bool turn_off_fg;
218 enum ab8500_fg_calibration_state calib_state;
219 enum ab8500_fg_discharge_state discharge_state;
220 enum ab8500_fg_charge_state charge_state;
221 struct completion ab8500_fg_started;
222 struct completion ab8500_fg_complete;
223 struct ab8500_fg_flags flags;
224 struct ab8500_fg_battery_capacity bat_cap;
225 struct ab8500_fg_avg_cap avg_cap;
226 struct ab8500 *parent;
227 struct ab8500_gpadc *gpadc;
228 struct abx500_bm_data *bm;
229 struct power_supply *fg_psy;
230 struct workqueue_struct *fg_wq;
231 struct delayed_work fg_periodic_work;
232 struct delayed_work fg_low_bat_work;
233 struct delayed_work fg_reinit_work;
234 struct work_struct fg_work;
235 struct work_struct fg_acc_cur_work;
236 struct delayed_work fg_check_hw_failure_work;
237 struct mutex cc_lock;
238 struct kobject fg_kobject;
239 };
240 static LIST_HEAD(ab8500_fg_list);
241
242 /**
243 * ab8500_fg_get() - returns a reference to the primary AB8500 fuel gauge
244 * (i.e. the first fuel gauge in the instance list)
245 */
ab8500_fg_get(void)246 struct ab8500_fg *ab8500_fg_get(void)
247 {
248 struct ab8500_fg *fg;
249
250 if (list_empty(&ab8500_fg_list))
251 return NULL;
252
253 fg = list_first_entry(&ab8500_fg_list, struct ab8500_fg, node);
254 return fg;
255 }
256
257 /* Main battery properties */
258 static enum power_supply_property ab8500_fg_props[] = {
259 POWER_SUPPLY_PROP_VOLTAGE_NOW,
260 POWER_SUPPLY_PROP_CURRENT_NOW,
261 POWER_SUPPLY_PROP_CURRENT_AVG,
262 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
263 POWER_SUPPLY_PROP_ENERGY_FULL,
264 POWER_SUPPLY_PROP_ENERGY_NOW,
265 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
266 POWER_SUPPLY_PROP_CHARGE_FULL,
267 POWER_SUPPLY_PROP_CHARGE_NOW,
268 POWER_SUPPLY_PROP_CAPACITY,
269 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
270 };
271
272 /*
273 * This array maps the raw hex value to lowbat voltage used by the AB8500
274 * Values taken from the UM0836
275 */
276 static int ab8500_fg_lowbat_voltage_map[] = {
277 2300 ,
278 2325 ,
279 2350 ,
280 2375 ,
281 2400 ,
282 2425 ,
283 2450 ,
284 2475 ,
285 2500 ,
286 2525 ,
287 2550 ,
288 2575 ,
289 2600 ,
290 2625 ,
291 2650 ,
292 2675 ,
293 2700 ,
294 2725 ,
295 2750 ,
296 2775 ,
297 2800 ,
298 2825 ,
299 2850 ,
300 2875 ,
301 2900 ,
302 2925 ,
303 2950 ,
304 2975 ,
305 3000 ,
306 3025 ,
307 3050 ,
308 3075 ,
309 3100 ,
310 3125 ,
311 3150 ,
312 3175 ,
313 3200 ,
314 3225 ,
315 3250 ,
316 3275 ,
317 3300 ,
318 3325 ,
319 3350 ,
320 3375 ,
321 3400 ,
322 3425 ,
323 3450 ,
324 3475 ,
325 3500 ,
326 3525 ,
327 3550 ,
328 3575 ,
329 3600 ,
330 3625 ,
331 3650 ,
332 3675 ,
333 3700 ,
334 3725 ,
335 3750 ,
336 3775 ,
337 3800 ,
338 3825 ,
339 3850 ,
340 3850 ,
341 };
342
ab8500_volt_to_regval(int voltage)343 static u8 ab8500_volt_to_regval(int voltage)
344 {
345 int i;
346
347 if (voltage < ab8500_fg_lowbat_voltage_map[0])
348 return 0;
349
350 for (i = 0; i < ARRAY_SIZE(ab8500_fg_lowbat_voltage_map); i++) {
351 if (voltage < ab8500_fg_lowbat_voltage_map[i])
352 return (u8) i - 1;
353 }
354
355 /* If not captured above, return index of last element */
356 return (u8) ARRAY_SIZE(ab8500_fg_lowbat_voltage_map) - 1;
357 }
358
359 /**
360 * ab8500_fg_is_low_curr() - Low or high current mode
361 * @di: pointer to the ab8500_fg structure
362 * @curr: the current to base or our decision on
363 *
364 * Low current mode if the current consumption is below a certain threshold
365 */
ab8500_fg_is_low_curr(struct ab8500_fg * di,int curr)366 static int ab8500_fg_is_low_curr(struct ab8500_fg *di, int curr)
367 {
368 /*
369 * We want to know if we're in low current mode
370 */
371 if (curr > -di->bm->fg_params->high_curr_threshold)
372 return true;
373 else
374 return false;
375 }
376
377 /**
378 * ab8500_fg_add_cap_sample() - Add capacity to average filter
379 * @di: pointer to the ab8500_fg structure
380 * @sample: the capacity in mAh to add to the filter
381 *
382 * A capacity is added to the filter and a new mean capacity is calculated and
383 * returned
384 */
ab8500_fg_add_cap_sample(struct ab8500_fg * di,int sample)385 static int ab8500_fg_add_cap_sample(struct ab8500_fg *di, int sample)
386 {
387 struct timespec64 ts64;
388 struct ab8500_fg_avg_cap *avg = &di->avg_cap;
389
390 getnstimeofday64(&ts64);
391
392 do {
393 avg->sum += sample - avg->samples[avg->pos];
394 avg->samples[avg->pos] = sample;
395 avg->time_stamps[avg->pos] = ts64.tv_sec;
396 avg->pos++;
397
398 if (avg->pos == NBR_AVG_SAMPLES)
399 avg->pos = 0;
400
401 if (avg->nbr_samples < NBR_AVG_SAMPLES)
402 avg->nbr_samples++;
403
404 /*
405 * Check the time stamp for each sample. If too old,
406 * replace with latest sample
407 */
408 } while (ts64.tv_sec - VALID_CAPACITY_SEC > avg->time_stamps[avg->pos]);
409
410 avg->avg = avg->sum / avg->nbr_samples;
411
412 return avg->avg;
413 }
414
415 /**
416 * ab8500_fg_clear_cap_samples() - Clear average filter
417 * @di: pointer to the ab8500_fg structure
418 *
419 * The capacity filter is is reset to zero.
420 */
ab8500_fg_clear_cap_samples(struct ab8500_fg * di)421 static void ab8500_fg_clear_cap_samples(struct ab8500_fg *di)
422 {
423 int i;
424 struct ab8500_fg_avg_cap *avg = &di->avg_cap;
425
426 avg->pos = 0;
427 avg->nbr_samples = 0;
428 avg->sum = 0;
429 avg->avg = 0;
430
431 for (i = 0; i < NBR_AVG_SAMPLES; i++) {
432 avg->samples[i] = 0;
433 avg->time_stamps[i] = 0;
434 }
435 }
436
437 /**
438 * ab8500_fg_fill_cap_sample() - Fill average filter
439 * @di: pointer to the ab8500_fg structure
440 * @sample: the capacity in mAh to fill the filter with
441 *
442 * The capacity filter is filled with a capacity in mAh
443 */
ab8500_fg_fill_cap_sample(struct ab8500_fg * di,int sample)444 static void ab8500_fg_fill_cap_sample(struct ab8500_fg *di, int sample)
445 {
446 int i;
447 struct timespec64 ts64;
448 struct ab8500_fg_avg_cap *avg = &di->avg_cap;
449
450 getnstimeofday64(&ts64);
451
452 for (i = 0; i < NBR_AVG_SAMPLES; i++) {
453 avg->samples[i] = sample;
454 avg->time_stamps[i] = ts64.tv_sec;
455 }
456
457 avg->pos = 0;
458 avg->nbr_samples = NBR_AVG_SAMPLES;
459 avg->sum = sample * NBR_AVG_SAMPLES;
460 avg->avg = sample;
461 }
462
463 /**
464 * ab8500_fg_coulomb_counter() - enable coulomb counter
465 * @di: pointer to the ab8500_fg structure
466 * @enable: enable/disable
467 *
468 * Enable/Disable coulomb counter.
469 * On failure returns negative value.
470 */
ab8500_fg_coulomb_counter(struct ab8500_fg * di,bool enable)471 static int ab8500_fg_coulomb_counter(struct ab8500_fg *di, bool enable)
472 {
473 int ret = 0;
474 mutex_lock(&di->cc_lock);
475 if (enable) {
476 /* To be able to reprogram the number of samples, we have to
477 * first stop the CC and then enable it again */
478 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
479 AB8500_RTC_CC_CONF_REG, 0x00);
480 if (ret)
481 goto cc_err;
482
483 /* Program the samples */
484 ret = abx500_set_register_interruptible(di->dev,
485 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU,
486 di->fg_samples);
487 if (ret)
488 goto cc_err;
489
490 /* Start the CC */
491 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
492 AB8500_RTC_CC_CONF_REG,
493 (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA));
494 if (ret)
495 goto cc_err;
496
497 di->flags.fg_enabled = true;
498 } else {
499 /* Clear any pending read requests */
500 ret = abx500_mask_and_set_register_interruptible(di->dev,
501 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
502 (RESET_ACCU | READ_REQ), 0);
503 if (ret)
504 goto cc_err;
505
506 ret = abx500_set_register_interruptible(di->dev,
507 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU_CTRL, 0);
508 if (ret)
509 goto cc_err;
510
511 /* Stop the CC */
512 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
513 AB8500_RTC_CC_CONF_REG, 0);
514 if (ret)
515 goto cc_err;
516
517 di->flags.fg_enabled = false;
518
519 }
520 dev_dbg(di->dev, " CC enabled: %d Samples: %d\n",
521 enable, di->fg_samples);
522
523 mutex_unlock(&di->cc_lock);
524
525 return ret;
526 cc_err:
527 dev_err(di->dev, "%s Enabling coulomb counter failed\n", __func__);
528 mutex_unlock(&di->cc_lock);
529 return ret;
530 }
531
532 /**
533 * ab8500_fg_inst_curr_start() - start battery instantaneous current
534 * @di: pointer to the ab8500_fg structure
535 *
536 * Returns 0 or error code
537 * Note: This is part "one" and has to be called before
538 * ab8500_fg_inst_curr_finalize()
539 */
ab8500_fg_inst_curr_start(struct ab8500_fg * di)540 int ab8500_fg_inst_curr_start(struct ab8500_fg *di)
541 {
542 u8 reg_val;
543 int ret;
544
545 mutex_lock(&di->cc_lock);
546
547 di->nbr_cceoc_irq_cnt = 0;
548 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
549 AB8500_RTC_CC_CONF_REG, ®_val);
550 if (ret < 0)
551 goto fail;
552
553 if (!(reg_val & CC_PWR_UP_ENA)) {
554 dev_dbg(di->dev, "%s Enable FG\n", __func__);
555 di->turn_off_fg = true;
556
557 /* Program the samples */
558 ret = abx500_set_register_interruptible(di->dev,
559 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU,
560 SEC_TO_SAMPLE(10));
561 if (ret)
562 goto fail;
563
564 /* Start the CC */
565 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
566 AB8500_RTC_CC_CONF_REG,
567 (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA));
568 if (ret)
569 goto fail;
570 } else {
571 di->turn_off_fg = false;
572 }
573
574 /* Return and WFI */
575 reinit_completion(&di->ab8500_fg_started);
576 reinit_completion(&di->ab8500_fg_complete);
577 enable_irq(di->irq);
578
579 /* Note: cc_lock is still locked */
580 return 0;
581 fail:
582 mutex_unlock(&di->cc_lock);
583 return ret;
584 }
585
586 /**
587 * ab8500_fg_inst_curr_started() - check if fg conversion has started
588 * @di: pointer to the ab8500_fg structure
589 *
590 * Returns 1 if conversion started, 0 if still waiting
591 */
ab8500_fg_inst_curr_started(struct ab8500_fg * di)592 int ab8500_fg_inst_curr_started(struct ab8500_fg *di)
593 {
594 return completion_done(&di->ab8500_fg_started);
595 }
596
597 /**
598 * ab8500_fg_inst_curr_done() - check if fg conversion is done
599 * @di: pointer to the ab8500_fg structure
600 *
601 * Returns 1 if conversion done, 0 if still waiting
602 */
ab8500_fg_inst_curr_done(struct ab8500_fg * di)603 int ab8500_fg_inst_curr_done(struct ab8500_fg *di)
604 {
605 return completion_done(&di->ab8500_fg_complete);
606 }
607
608 /**
609 * ab8500_fg_inst_curr_finalize() - battery instantaneous current
610 * @di: pointer to the ab8500_fg structure
611 * @res: battery instantenous current(on success)
612 *
613 * Returns 0 or an error code
614 * Note: This is part "two" and has to be called at earliest 250 ms
615 * after ab8500_fg_inst_curr_start()
616 */
ab8500_fg_inst_curr_finalize(struct ab8500_fg * di,int * res)617 int ab8500_fg_inst_curr_finalize(struct ab8500_fg *di, int *res)
618 {
619 u8 low, high;
620 int val;
621 int ret;
622 unsigned long timeout;
623
624 if (!completion_done(&di->ab8500_fg_complete)) {
625 timeout = wait_for_completion_timeout(
626 &di->ab8500_fg_complete,
627 INS_CURR_TIMEOUT);
628 dev_dbg(di->dev, "Finalize time: %d ms\n",
629 jiffies_to_msecs(INS_CURR_TIMEOUT - timeout));
630 if (!timeout) {
631 ret = -ETIME;
632 disable_irq(di->irq);
633 di->nbr_cceoc_irq_cnt = 0;
634 dev_err(di->dev, "completion timed out [%d]\n",
635 __LINE__);
636 goto fail;
637 }
638 }
639
640 disable_irq(di->irq);
641 di->nbr_cceoc_irq_cnt = 0;
642
643 ret = abx500_mask_and_set_register_interruptible(di->dev,
644 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
645 READ_REQ, READ_REQ);
646
647 /* 100uS between read request and read is needed */
648 usleep_range(100, 100);
649
650 /* Read CC Sample conversion value Low and high */
651 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
652 AB8500_GASG_CC_SMPL_CNVL_REG, &low);
653 if (ret < 0)
654 goto fail;
655
656 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
657 AB8500_GASG_CC_SMPL_CNVH_REG, &high);
658 if (ret < 0)
659 goto fail;
660
661 /*
662 * negative value for Discharging
663 * convert 2's compliment into decimal
664 */
665 if (high & 0x10)
666 val = (low | (high << 8) | 0xFFFFE000);
667 else
668 val = (low | (high << 8));
669
670 /*
671 * Convert to unit value in mA
672 * Full scale input voltage is
673 * 63.160mV => LSB = 63.160mV/(4096*res) = 1.542mA
674 * Given a 250ms conversion cycle time the LSB corresponds
675 * to 107.1 nAh. Convert to current by dividing by the conversion
676 * time in hours (250ms = 1 / (3600 * 4)h)
677 * 107.1nAh assumes 10mOhm, but fg_res is in 0.1mOhm
678 */
679 val = (val * QLSB_NANO_AMP_HOURS_X10 * 36 * 4) /
680 (1000 * di->bm->fg_res);
681
682 if (di->turn_off_fg) {
683 dev_dbg(di->dev, "%s Disable FG\n", __func__);
684
685 /* Clear any pending read requests */
686 ret = abx500_set_register_interruptible(di->dev,
687 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 0);
688 if (ret)
689 goto fail;
690
691 /* Stop the CC */
692 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
693 AB8500_RTC_CC_CONF_REG, 0);
694 if (ret)
695 goto fail;
696 }
697 mutex_unlock(&di->cc_lock);
698 (*res) = val;
699
700 return 0;
701 fail:
702 mutex_unlock(&di->cc_lock);
703 return ret;
704 }
705
706 /**
707 * ab8500_fg_inst_curr_blocking() - battery instantaneous current
708 * @di: pointer to the ab8500_fg structure
709 * @res: battery instantenous current(on success)
710 *
711 * Returns 0 else error code
712 */
ab8500_fg_inst_curr_blocking(struct ab8500_fg * di)713 int ab8500_fg_inst_curr_blocking(struct ab8500_fg *di)
714 {
715 int ret;
716 unsigned long timeout;
717 int res = 0;
718
719 ret = ab8500_fg_inst_curr_start(di);
720 if (ret) {
721 dev_err(di->dev, "Failed to initialize fg_inst\n");
722 return 0;
723 }
724
725 /* Wait for CC to actually start */
726 if (!completion_done(&di->ab8500_fg_started)) {
727 timeout = wait_for_completion_timeout(
728 &di->ab8500_fg_started,
729 INS_CURR_TIMEOUT);
730 dev_dbg(di->dev, "Start time: %d ms\n",
731 jiffies_to_msecs(INS_CURR_TIMEOUT - timeout));
732 if (!timeout) {
733 ret = -ETIME;
734 dev_err(di->dev, "completion timed out [%d]\n",
735 __LINE__);
736 goto fail;
737 }
738 }
739
740 ret = ab8500_fg_inst_curr_finalize(di, &res);
741 if (ret) {
742 dev_err(di->dev, "Failed to finalize fg_inst\n");
743 return 0;
744 }
745
746 dev_dbg(di->dev, "%s instant current: %d", __func__, res);
747 return res;
748 fail:
749 disable_irq(di->irq);
750 mutex_unlock(&di->cc_lock);
751 return ret;
752 }
753
754 /**
755 * ab8500_fg_acc_cur_work() - average battery current
756 * @work: pointer to the work_struct structure
757 *
758 * Updated the average battery current obtained from the
759 * coulomb counter.
760 */
ab8500_fg_acc_cur_work(struct work_struct * work)761 static void ab8500_fg_acc_cur_work(struct work_struct *work)
762 {
763 int val;
764 int ret;
765 u8 low, med, high;
766
767 struct ab8500_fg *di = container_of(work,
768 struct ab8500_fg, fg_acc_cur_work);
769
770 mutex_lock(&di->cc_lock);
771 ret = abx500_set_register_interruptible(di->dev, AB8500_GAS_GAUGE,
772 AB8500_GASG_CC_NCOV_ACCU_CTRL, RD_NCONV_ACCU_REQ);
773 if (ret)
774 goto exit;
775
776 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
777 AB8500_GASG_CC_NCOV_ACCU_LOW, &low);
778 if (ret < 0)
779 goto exit;
780
781 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
782 AB8500_GASG_CC_NCOV_ACCU_MED, &med);
783 if (ret < 0)
784 goto exit;
785
786 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
787 AB8500_GASG_CC_NCOV_ACCU_HIGH, &high);
788 if (ret < 0)
789 goto exit;
790
791 /* Check for sign bit in case of negative value, 2's compliment */
792 if (high & 0x10)
793 val = (low | (med << 8) | (high << 16) | 0xFFE00000);
794 else
795 val = (low | (med << 8) | (high << 16));
796
797 /*
798 * Convert to uAh
799 * Given a 250ms conversion cycle time the LSB corresponds
800 * to 112.9 nAh.
801 * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm
802 */
803 di->accu_charge = (val * QLSB_NANO_AMP_HOURS_X10) /
804 (100 * di->bm->fg_res);
805
806 /*
807 * Convert to unit value in mA
808 * by dividing by the conversion
809 * time in hours (= samples / (3600 * 4)h)
810 * and multiply with 1000
811 */
812 di->avg_curr = (val * QLSB_NANO_AMP_HOURS_X10 * 36) /
813 (1000 * di->bm->fg_res * (di->fg_samples / 4));
814
815 di->flags.conv_done = true;
816
817 mutex_unlock(&di->cc_lock);
818
819 queue_work(di->fg_wq, &di->fg_work);
820
821 dev_dbg(di->dev, "fg_res: %d, fg_samples: %d, gasg: %d, accu_charge: %d \n",
822 di->bm->fg_res, di->fg_samples, val, di->accu_charge);
823 return;
824 exit:
825 dev_err(di->dev,
826 "Failed to read or write gas gauge registers\n");
827 mutex_unlock(&di->cc_lock);
828 queue_work(di->fg_wq, &di->fg_work);
829 }
830
831 /**
832 * ab8500_fg_bat_voltage() - get battery voltage
833 * @di: pointer to the ab8500_fg structure
834 *
835 * Returns battery voltage(on success) else error code
836 */
ab8500_fg_bat_voltage(struct ab8500_fg * di)837 static int ab8500_fg_bat_voltage(struct ab8500_fg *di)
838 {
839 int vbat;
840 static int prev;
841
842 vbat = ab8500_gpadc_convert(di->gpadc, MAIN_BAT_V);
843 if (vbat < 0) {
844 dev_err(di->dev,
845 "%s gpadc conversion failed, using previous value\n",
846 __func__);
847 return prev;
848 }
849
850 prev = vbat;
851 return vbat;
852 }
853
854 /**
855 * ab8500_fg_volt_to_capacity() - Voltage based capacity
856 * @di: pointer to the ab8500_fg structure
857 * @voltage: The voltage to convert to a capacity
858 *
859 * Returns battery capacity in per mille based on voltage
860 */
ab8500_fg_volt_to_capacity(struct ab8500_fg * di,int voltage)861 static int ab8500_fg_volt_to_capacity(struct ab8500_fg *di, int voltage)
862 {
863 int i, tbl_size;
864 const struct abx500_v_to_cap *tbl;
865 int cap = 0;
866
867 tbl = di->bm->bat_type[di->bm->batt_id].v_to_cap_tbl,
868 tbl_size = di->bm->bat_type[di->bm->batt_id].n_v_cap_tbl_elements;
869
870 for (i = 0; i < tbl_size; ++i) {
871 if (voltage > tbl[i].voltage)
872 break;
873 }
874
875 if ((i > 0) && (i < tbl_size)) {
876 cap = interpolate(voltage,
877 tbl[i].voltage,
878 tbl[i].capacity * 10,
879 tbl[i-1].voltage,
880 tbl[i-1].capacity * 10);
881 } else if (i == 0) {
882 cap = 1000;
883 } else {
884 cap = 0;
885 }
886
887 dev_dbg(di->dev, "%s Vbat: %d, Cap: %d per mille",
888 __func__, voltage, cap);
889
890 return cap;
891 }
892
893 /**
894 * ab8500_fg_uncomp_volt_to_capacity() - Uncompensated voltage based capacity
895 * @di: pointer to the ab8500_fg structure
896 *
897 * Returns battery capacity based on battery voltage that is not compensated
898 * for the voltage drop due to the load
899 */
ab8500_fg_uncomp_volt_to_capacity(struct ab8500_fg * di)900 static int ab8500_fg_uncomp_volt_to_capacity(struct ab8500_fg *di)
901 {
902 di->vbat = ab8500_fg_bat_voltage(di);
903 return ab8500_fg_volt_to_capacity(di, di->vbat);
904 }
905
906 /**
907 * ab8500_fg_battery_resistance() - Returns the battery inner resistance
908 * @di: pointer to the ab8500_fg structure
909 *
910 * Returns battery inner resistance added with the fuel gauge resistor value
911 * to get the total resistance in the whole link from gnd to bat+ node.
912 */
ab8500_fg_battery_resistance(struct ab8500_fg * di)913 static int ab8500_fg_battery_resistance(struct ab8500_fg *di)
914 {
915 int i, tbl_size;
916 const struct batres_vs_temp *tbl;
917 int resist = 0;
918
919 tbl = di->bm->bat_type[di->bm->batt_id].batres_tbl;
920 tbl_size = di->bm->bat_type[di->bm->batt_id].n_batres_tbl_elements;
921
922 for (i = 0; i < tbl_size; ++i) {
923 if (di->bat_temp / 10 > tbl[i].temp)
924 break;
925 }
926
927 if ((i > 0) && (i < tbl_size)) {
928 resist = interpolate(di->bat_temp / 10,
929 tbl[i].temp,
930 tbl[i].resist,
931 tbl[i-1].temp,
932 tbl[i-1].resist);
933 } else if (i == 0) {
934 resist = tbl[0].resist;
935 } else {
936 resist = tbl[tbl_size - 1].resist;
937 }
938
939 dev_dbg(di->dev, "%s Temp: %d battery internal resistance: %d"
940 " fg resistance %d, total: %d (mOhm)\n",
941 __func__, di->bat_temp, resist, di->bm->fg_res / 10,
942 (di->bm->fg_res / 10) + resist);
943
944 /* fg_res variable is in 0.1mOhm */
945 resist += di->bm->fg_res / 10;
946
947 return resist;
948 }
949
950 /**
951 * ab8500_fg_load_comp_volt_to_capacity() - Load compensated voltage based capacity
952 * @di: pointer to the ab8500_fg structure
953 *
954 * Returns battery capacity based on battery voltage that is load compensated
955 * for the voltage drop
956 */
ab8500_fg_load_comp_volt_to_capacity(struct ab8500_fg * di)957 static int ab8500_fg_load_comp_volt_to_capacity(struct ab8500_fg *di)
958 {
959 int vbat_comp, res;
960 int i = 0;
961 int vbat = 0;
962
963 ab8500_fg_inst_curr_start(di);
964
965 do {
966 vbat += ab8500_fg_bat_voltage(di);
967 i++;
968 usleep_range(5000, 6000);
969 } while (!ab8500_fg_inst_curr_done(di));
970
971 ab8500_fg_inst_curr_finalize(di, &di->inst_curr);
972
973 di->vbat = vbat / i;
974 res = ab8500_fg_battery_resistance(di);
975
976 /* Use Ohms law to get the load compensated voltage */
977 vbat_comp = di->vbat - (di->inst_curr * res) / 1000;
978
979 dev_dbg(di->dev, "%s Measured Vbat: %dmV,Compensated Vbat %dmV, "
980 "R: %dmOhm, Current: %dmA Vbat Samples: %d\n",
981 __func__, di->vbat, vbat_comp, res, di->inst_curr, i);
982
983 return ab8500_fg_volt_to_capacity(di, vbat_comp);
984 }
985
986 /**
987 * ab8500_fg_convert_mah_to_permille() - Capacity in mAh to permille
988 * @di: pointer to the ab8500_fg structure
989 * @cap_mah: capacity in mAh
990 *
991 * Converts capacity in mAh to capacity in permille
992 */
ab8500_fg_convert_mah_to_permille(struct ab8500_fg * di,int cap_mah)993 static int ab8500_fg_convert_mah_to_permille(struct ab8500_fg *di, int cap_mah)
994 {
995 return (cap_mah * 1000) / di->bat_cap.max_mah_design;
996 }
997
998 /**
999 * ab8500_fg_convert_permille_to_mah() - Capacity in permille to mAh
1000 * @di: pointer to the ab8500_fg structure
1001 * @cap_pm: capacity in permille
1002 *
1003 * Converts capacity in permille to capacity in mAh
1004 */
ab8500_fg_convert_permille_to_mah(struct ab8500_fg * di,int cap_pm)1005 static int ab8500_fg_convert_permille_to_mah(struct ab8500_fg *di, int cap_pm)
1006 {
1007 return cap_pm * di->bat_cap.max_mah_design / 1000;
1008 }
1009
1010 /**
1011 * ab8500_fg_convert_mah_to_uwh() - Capacity in mAh to uWh
1012 * @di: pointer to the ab8500_fg structure
1013 * @cap_mah: capacity in mAh
1014 *
1015 * Converts capacity in mAh to capacity in uWh
1016 */
ab8500_fg_convert_mah_to_uwh(struct ab8500_fg * di,int cap_mah)1017 static int ab8500_fg_convert_mah_to_uwh(struct ab8500_fg *di, int cap_mah)
1018 {
1019 u64 div_res;
1020 u32 div_rem;
1021
1022 div_res = ((u64) cap_mah) * ((u64) di->vbat_nom);
1023 div_rem = do_div(div_res, 1000);
1024
1025 /* Make sure to round upwards if necessary */
1026 if (div_rem >= 1000 / 2)
1027 div_res++;
1028
1029 return (int) div_res;
1030 }
1031
1032 /**
1033 * ab8500_fg_calc_cap_charging() - Calculate remaining capacity while charging
1034 * @di: pointer to the ab8500_fg structure
1035 *
1036 * Return the capacity in mAh based on previous calculated capcity and the FG
1037 * accumulator register value. The filter is filled with this capacity
1038 */
ab8500_fg_calc_cap_charging(struct ab8500_fg * di)1039 static int ab8500_fg_calc_cap_charging(struct ab8500_fg *di)
1040 {
1041 dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n",
1042 __func__,
1043 di->bat_cap.mah,
1044 di->accu_charge);
1045
1046 /* Capacity should not be less than 0 */
1047 if (di->bat_cap.mah + di->accu_charge > 0)
1048 di->bat_cap.mah += di->accu_charge;
1049 else
1050 di->bat_cap.mah = 0;
1051 /*
1052 * We force capacity to 100% once when the algorithm
1053 * reports that it's full.
1054 */
1055 if (di->bat_cap.mah >= di->bat_cap.max_mah_design ||
1056 di->flags.force_full) {
1057 di->bat_cap.mah = di->bat_cap.max_mah_design;
1058 }
1059
1060 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1061 di->bat_cap.permille =
1062 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1063
1064 /* We need to update battery voltage and inst current when charging */
1065 di->vbat = ab8500_fg_bat_voltage(di);
1066 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1067
1068 return di->bat_cap.mah;
1069 }
1070
1071 /**
1072 * ab8500_fg_calc_cap_discharge_voltage() - Capacity in discharge with voltage
1073 * @di: pointer to the ab8500_fg structure
1074 * @comp: if voltage should be load compensated before capacity calc
1075 *
1076 * Return the capacity in mAh based on the battery voltage. The voltage can
1077 * either be load compensated or not. This value is added to the filter and a
1078 * new mean value is calculated and returned.
1079 */
ab8500_fg_calc_cap_discharge_voltage(struct ab8500_fg * di,bool comp)1080 static int ab8500_fg_calc_cap_discharge_voltage(struct ab8500_fg *di, bool comp)
1081 {
1082 int permille, mah;
1083
1084 if (comp)
1085 permille = ab8500_fg_load_comp_volt_to_capacity(di);
1086 else
1087 permille = ab8500_fg_uncomp_volt_to_capacity(di);
1088
1089 mah = ab8500_fg_convert_permille_to_mah(di, permille);
1090
1091 di->bat_cap.mah = ab8500_fg_add_cap_sample(di, mah);
1092 di->bat_cap.permille =
1093 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1094
1095 return di->bat_cap.mah;
1096 }
1097
1098 /**
1099 * ab8500_fg_calc_cap_discharge_fg() - Capacity in discharge with FG
1100 * @di: pointer to the ab8500_fg structure
1101 *
1102 * Return the capacity in mAh based on previous calculated capcity and the FG
1103 * accumulator register value. This value is added to the filter and a
1104 * new mean value is calculated and returned.
1105 */
ab8500_fg_calc_cap_discharge_fg(struct ab8500_fg * di)1106 static int ab8500_fg_calc_cap_discharge_fg(struct ab8500_fg *di)
1107 {
1108 int permille_volt, permille;
1109
1110 dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n",
1111 __func__,
1112 di->bat_cap.mah,
1113 di->accu_charge);
1114
1115 /* Capacity should not be less than 0 */
1116 if (di->bat_cap.mah + di->accu_charge > 0)
1117 di->bat_cap.mah += di->accu_charge;
1118 else
1119 di->bat_cap.mah = 0;
1120
1121 if (di->bat_cap.mah >= di->bat_cap.max_mah_design)
1122 di->bat_cap.mah = di->bat_cap.max_mah_design;
1123
1124 /*
1125 * Check against voltage based capacity. It can not be lower
1126 * than what the uncompensated voltage says
1127 */
1128 permille = ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1129 permille_volt = ab8500_fg_uncomp_volt_to_capacity(di);
1130
1131 if (permille < permille_volt) {
1132 di->bat_cap.permille = permille_volt;
1133 di->bat_cap.mah = ab8500_fg_convert_permille_to_mah(di,
1134 di->bat_cap.permille);
1135
1136 dev_dbg(di->dev, "%s voltage based: perm %d perm_volt %d\n",
1137 __func__,
1138 permille,
1139 permille_volt);
1140
1141 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1142 } else {
1143 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1144 di->bat_cap.permille =
1145 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1146 }
1147
1148 return di->bat_cap.mah;
1149 }
1150
1151 /**
1152 * ab8500_fg_capacity_level() - Get the battery capacity level
1153 * @di: pointer to the ab8500_fg structure
1154 *
1155 * Get the battery capacity level based on the capacity in percent
1156 */
ab8500_fg_capacity_level(struct ab8500_fg * di)1157 static int ab8500_fg_capacity_level(struct ab8500_fg *di)
1158 {
1159 int ret, percent;
1160
1161 percent = DIV_ROUND_CLOSEST(di->bat_cap.permille, 10);
1162
1163 if (percent <= di->bm->cap_levels->critical ||
1164 di->flags.low_bat)
1165 ret = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
1166 else if (percent <= di->bm->cap_levels->low)
1167 ret = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
1168 else if (percent <= di->bm->cap_levels->normal)
1169 ret = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
1170 else if (percent <= di->bm->cap_levels->high)
1171 ret = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
1172 else
1173 ret = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
1174
1175 return ret;
1176 }
1177
1178 /**
1179 * ab8500_fg_calculate_scaled_capacity() - Capacity scaling
1180 * @di: pointer to the ab8500_fg structure
1181 *
1182 * Calculates the capacity to be shown to upper layers. Scales the capacity
1183 * to have 100% as a reference from the actual capacity upon removal of charger
1184 * when charging is in maintenance mode.
1185 */
ab8500_fg_calculate_scaled_capacity(struct ab8500_fg * di)1186 static int ab8500_fg_calculate_scaled_capacity(struct ab8500_fg *di)
1187 {
1188 struct ab8500_fg_cap_scaling *cs = &di->bat_cap.cap_scale;
1189 int capacity = di->bat_cap.prev_percent;
1190
1191 if (!cs->enable)
1192 return capacity;
1193
1194 /*
1195 * As long as we are in fully charge mode scale the capacity
1196 * to show 100%.
1197 */
1198 if (di->flags.fully_charged) {
1199 cs->cap_to_scale[0] = 100;
1200 cs->cap_to_scale[1] =
1201 max(capacity, di->bm->fg_params->maint_thres);
1202 dev_dbg(di->dev, "Scale cap with %d/%d\n",
1203 cs->cap_to_scale[0], cs->cap_to_scale[1]);
1204 }
1205
1206 /* Calculates the scaled capacity. */
1207 if ((cs->cap_to_scale[0] != cs->cap_to_scale[1])
1208 && (cs->cap_to_scale[1] > 0))
1209 capacity = min(100,
1210 DIV_ROUND_CLOSEST(di->bat_cap.prev_percent *
1211 cs->cap_to_scale[0],
1212 cs->cap_to_scale[1]));
1213
1214 if (di->flags.charging) {
1215 if (capacity < cs->disable_cap_level) {
1216 cs->disable_cap_level = capacity;
1217 dev_dbg(di->dev, "Cap to stop scale lowered %d%%\n",
1218 cs->disable_cap_level);
1219 } else if (!di->flags.fully_charged) {
1220 if (di->bat_cap.prev_percent >=
1221 cs->disable_cap_level) {
1222 dev_dbg(di->dev, "Disabling scaled capacity\n");
1223 cs->enable = false;
1224 capacity = di->bat_cap.prev_percent;
1225 } else {
1226 dev_dbg(di->dev,
1227 "Waiting in cap to level %d%%\n",
1228 cs->disable_cap_level);
1229 capacity = cs->disable_cap_level;
1230 }
1231 }
1232 }
1233
1234 return capacity;
1235 }
1236
1237 /**
1238 * ab8500_fg_update_cap_scalers() - Capacity scaling
1239 * @di: pointer to the ab8500_fg structure
1240 *
1241 * To be called when state change from charge<->discharge to update
1242 * the capacity scalers.
1243 */
ab8500_fg_update_cap_scalers(struct ab8500_fg * di)1244 static void ab8500_fg_update_cap_scalers(struct ab8500_fg *di)
1245 {
1246 struct ab8500_fg_cap_scaling *cs = &di->bat_cap.cap_scale;
1247
1248 if (!cs->enable)
1249 return;
1250 if (di->flags.charging) {
1251 di->bat_cap.cap_scale.disable_cap_level =
1252 di->bat_cap.cap_scale.scaled_cap;
1253 dev_dbg(di->dev, "Cap to stop scale at charge %d%%\n",
1254 di->bat_cap.cap_scale.disable_cap_level);
1255 } else {
1256 if (cs->scaled_cap != 100) {
1257 cs->cap_to_scale[0] = cs->scaled_cap;
1258 cs->cap_to_scale[1] = di->bat_cap.prev_percent;
1259 } else {
1260 cs->cap_to_scale[0] = 100;
1261 cs->cap_to_scale[1] =
1262 max(di->bat_cap.prev_percent,
1263 di->bm->fg_params->maint_thres);
1264 }
1265
1266 dev_dbg(di->dev, "Cap to scale at discharge %d/%d\n",
1267 cs->cap_to_scale[0], cs->cap_to_scale[1]);
1268 }
1269 }
1270
1271 /**
1272 * ab8500_fg_check_capacity_limits() - Check if capacity has changed
1273 * @di: pointer to the ab8500_fg structure
1274 * @init: capacity is allowed to go up in init mode
1275 *
1276 * Check if capacity or capacity limit has changed and notify the system
1277 * about it using the power_supply framework
1278 */
ab8500_fg_check_capacity_limits(struct ab8500_fg * di,bool init)1279 static void ab8500_fg_check_capacity_limits(struct ab8500_fg *di, bool init)
1280 {
1281 bool changed = false;
1282 int percent = DIV_ROUND_CLOSEST(di->bat_cap.permille, 10);
1283
1284 di->bat_cap.level = ab8500_fg_capacity_level(di);
1285
1286 if (di->bat_cap.level != di->bat_cap.prev_level) {
1287 /*
1288 * We do not allow reported capacity level to go up
1289 * unless we're charging or if we're in init
1290 */
1291 if (!(!di->flags.charging && di->bat_cap.level >
1292 di->bat_cap.prev_level) || init) {
1293 dev_dbg(di->dev, "level changed from %d to %d\n",
1294 di->bat_cap.prev_level,
1295 di->bat_cap.level);
1296 di->bat_cap.prev_level = di->bat_cap.level;
1297 changed = true;
1298 } else {
1299 dev_dbg(di->dev, "level not allowed to go up "
1300 "since no charger is connected: %d to %d\n",
1301 di->bat_cap.prev_level,
1302 di->bat_cap.level);
1303 }
1304 }
1305
1306 /*
1307 * If we have received the LOW_BAT IRQ, set capacity to 0 to initiate
1308 * shutdown
1309 */
1310 if (di->flags.low_bat) {
1311 dev_dbg(di->dev, "Battery low, set capacity to 0\n");
1312 di->bat_cap.prev_percent = 0;
1313 di->bat_cap.permille = 0;
1314 percent = 0;
1315 di->bat_cap.prev_mah = 0;
1316 di->bat_cap.mah = 0;
1317 changed = true;
1318 } else if (di->flags.fully_charged) {
1319 /*
1320 * We report 100% if algorithm reported fully charged
1321 * and show 100% during maintenance charging (scaling).
1322 */
1323 if (di->flags.force_full) {
1324 di->bat_cap.prev_percent = percent;
1325 di->bat_cap.prev_mah = di->bat_cap.mah;
1326
1327 changed = true;
1328
1329 if (!di->bat_cap.cap_scale.enable &&
1330 di->bm->capacity_scaling) {
1331 di->bat_cap.cap_scale.enable = true;
1332 di->bat_cap.cap_scale.cap_to_scale[0] = 100;
1333 di->bat_cap.cap_scale.cap_to_scale[1] =
1334 di->bat_cap.prev_percent;
1335 di->bat_cap.cap_scale.disable_cap_level = 100;
1336 }
1337 } else if (di->bat_cap.prev_percent != percent) {
1338 dev_dbg(di->dev,
1339 "battery reported full "
1340 "but capacity dropping: %d\n",
1341 percent);
1342 di->bat_cap.prev_percent = percent;
1343 di->bat_cap.prev_mah = di->bat_cap.mah;
1344
1345 changed = true;
1346 }
1347 } else if (di->bat_cap.prev_percent != percent) {
1348 if (percent == 0) {
1349 /*
1350 * We will not report 0% unless we've got
1351 * the LOW_BAT IRQ, no matter what the FG
1352 * algorithm says.
1353 */
1354 di->bat_cap.prev_percent = 1;
1355 percent = 1;
1356
1357 changed = true;
1358 } else if (!(!di->flags.charging &&
1359 percent > di->bat_cap.prev_percent) || init) {
1360 /*
1361 * We do not allow reported capacity to go up
1362 * unless we're charging or if we're in init
1363 */
1364 dev_dbg(di->dev,
1365 "capacity changed from %d to %d (%d)\n",
1366 di->bat_cap.prev_percent,
1367 percent,
1368 di->bat_cap.permille);
1369 di->bat_cap.prev_percent = percent;
1370 di->bat_cap.prev_mah = di->bat_cap.mah;
1371
1372 changed = true;
1373 } else {
1374 dev_dbg(di->dev, "capacity not allowed to go up since "
1375 "no charger is connected: %d to %d (%d)\n",
1376 di->bat_cap.prev_percent,
1377 percent,
1378 di->bat_cap.permille);
1379 }
1380 }
1381
1382 if (changed) {
1383 if (di->bm->capacity_scaling) {
1384 di->bat_cap.cap_scale.scaled_cap =
1385 ab8500_fg_calculate_scaled_capacity(di);
1386
1387 dev_info(di->dev, "capacity=%d (%d)\n",
1388 di->bat_cap.prev_percent,
1389 di->bat_cap.cap_scale.scaled_cap);
1390 }
1391 power_supply_changed(di->fg_psy);
1392 if (di->flags.fully_charged && di->flags.force_full) {
1393 dev_dbg(di->dev, "Battery full, notifying.\n");
1394 di->flags.force_full = false;
1395 sysfs_notify(&di->fg_kobject, NULL, "charge_full");
1396 }
1397 sysfs_notify(&di->fg_kobject, NULL, "charge_now");
1398 }
1399 }
1400
ab8500_fg_charge_state_to(struct ab8500_fg * di,enum ab8500_fg_charge_state new_state)1401 static void ab8500_fg_charge_state_to(struct ab8500_fg *di,
1402 enum ab8500_fg_charge_state new_state)
1403 {
1404 dev_dbg(di->dev, "Charge state from %d [%s] to %d [%s]\n",
1405 di->charge_state,
1406 charge_state[di->charge_state],
1407 new_state,
1408 charge_state[new_state]);
1409
1410 di->charge_state = new_state;
1411 }
1412
ab8500_fg_discharge_state_to(struct ab8500_fg * di,enum ab8500_fg_discharge_state new_state)1413 static void ab8500_fg_discharge_state_to(struct ab8500_fg *di,
1414 enum ab8500_fg_discharge_state new_state)
1415 {
1416 dev_dbg(di->dev, "Disharge state from %d [%s] to %d [%s]\n",
1417 di->discharge_state,
1418 discharge_state[di->discharge_state],
1419 new_state,
1420 discharge_state[new_state]);
1421
1422 di->discharge_state = new_state;
1423 }
1424
1425 /**
1426 * ab8500_fg_algorithm_charging() - FG algorithm for when charging
1427 * @di: pointer to the ab8500_fg structure
1428 *
1429 * Battery capacity calculation state machine for when we're charging
1430 */
ab8500_fg_algorithm_charging(struct ab8500_fg * di)1431 static void ab8500_fg_algorithm_charging(struct ab8500_fg *di)
1432 {
1433 /*
1434 * If we change to discharge mode
1435 * we should start with recovery
1436 */
1437 if (di->discharge_state != AB8500_FG_DISCHARGE_INIT_RECOVERY)
1438 ab8500_fg_discharge_state_to(di,
1439 AB8500_FG_DISCHARGE_INIT_RECOVERY);
1440
1441 switch (di->charge_state) {
1442 case AB8500_FG_CHARGE_INIT:
1443 di->fg_samples = SEC_TO_SAMPLE(
1444 di->bm->fg_params->accu_charging);
1445
1446 ab8500_fg_coulomb_counter(di, true);
1447 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_READOUT);
1448
1449 break;
1450
1451 case AB8500_FG_CHARGE_READOUT:
1452 /*
1453 * Read the FG and calculate the new capacity
1454 */
1455 mutex_lock(&di->cc_lock);
1456 if (!di->flags.conv_done && !di->flags.force_full) {
1457 /* Wasn't the CC IRQ that got us here */
1458 mutex_unlock(&di->cc_lock);
1459 dev_dbg(di->dev, "%s CC conv not done\n",
1460 __func__);
1461
1462 break;
1463 }
1464 di->flags.conv_done = false;
1465 mutex_unlock(&di->cc_lock);
1466
1467 ab8500_fg_calc_cap_charging(di);
1468
1469 break;
1470
1471 default:
1472 break;
1473 }
1474
1475 /* Check capacity limits */
1476 ab8500_fg_check_capacity_limits(di, false);
1477 }
1478
force_capacity(struct ab8500_fg * di)1479 static void force_capacity(struct ab8500_fg *di)
1480 {
1481 int cap;
1482
1483 ab8500_fg_clear_cap_samples(di);
1484 cap = di->bat_cap.user_mah;
1485 if (cap > di->bat_cap.max_mah_design) {
1486 dev_dbg(di->dev, "Remaining cap %d can't be bigger than total"
1487 " %d\n", cap, di->bat_cap.max_mah_design);
1488 cap = di->bat_cap.max_mah_design;
1489 }
1490 ab8500_fg_fill_cap_sample(di, di->bat_cap.user_mah);
1491 di->bat_cap.permille = ab8500_fg_convert_mah_to_permille(di, cap);
1492 di->bat_cap.mah = cap;
1493 ab8500_fg_check_capacity_limits(di, true);
1494 }
1495
check_sysfs_capacity(struct ab8500_fg * di)1496 static bool check_sysfs_capacity(struct ab8500_fg *di)
1497 {
1498 int cap, lower, upper;
1499 int cap_permille;
1500
1501 cap = di->bat_cap.user_mah;
1502
1503 cap_permille = ab8500_fg_convert_mah_to_permille(di,
1504 di->bat_cap.user_mah);
1505
1506 lower = di->bat_cap.permille - di->bm->fg_params->user_cap_limit * 10;
1507 upper = di->bat_cap.permille + di->bm->fg_params->user_cap_limit * 10;
1508
1509 if (lower < 0)
1510 lower = 0;
1511 /* 1000 is permille, -> 100 percent */
1512 if (upper > 1000)
1513 upper = 1000;
1514
1515 dev_dbg(di->dev, "Capacity limits:"
1516 " (Lower: %d User: %d Upper: %d) [user: %d, was: %d]\n",
1517 lower, cap_permille, upper, cap, di->bat_cap.mah);
1518
1519 /* If within limits, use the saved capacity and exit estimation...*/
1520 if (cap_permille > lower && cap_permille < upper) {
1521 dev_dbg(di->dev, "OK! Using users cap %d uAh now\n", cap);
1522 force_capacity(di);
1523 return true;
1524 }
1525 dev_dbg(di->dev, "Capacity from user out of limits, ignoring");
1526 return false;
1527 }
1528
1529 /**
1530 * ab8500_fg_algorithm_discharging() - FG algorithm for when discharging
1531 * @di: pointer to the ab8500_fg structure
1532 *
1533 * Battery capacity calculation state machine for when we're discharging
1534 */
ab8500_fg_algorithm_discharging(struct ab8500_fg * di)1535 static void ab8500_fg_algorithm_discharging(struct ab8500_fg *di)
1536 {
1537 int sleep_time;
1538
1539 /* If we change to charge mode we should start with init */
1540 if (di->charge_state != AB8500_FG_CHARGE_INIT)
1541 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
1542
1543 switch (di->discharge_state) {
1544 case AB8500_FG_DISCHARGE_INIT:
1545 /* We use the FG IRQ to work on */
1546 di->init_cnt = 0;
1547 di->fg_samples = SEC_TO_SAMPLE(di->bm->fg_params->init_timer);
1548 ab8500_fg_coulomb_counter(di, true);
1549 ab8500_fg_discharge_state_to(di,
1550 AB8500_FG_DISCHARGE_INITMEASURING);
1551
1552 /* Intentional fallthrough */
1553 case AB8500_FG_DISCHARGE_INITMEASURING:
1554 /*
1555 * Discard a number of samples during startup.
1556 * After that, use compensated voltage for a few
1557 * samples to get an initial capacity.
1558 * Then go to READOUT
1559 */
1560 sleep_time = di->bm->fg_params->init_timer;
1561
1562 /* Discard the first [x] seconds */
1563 if (di->init_cnt > di->bm->fg_params->init_discard_time) {
1564 ab8500_fg_calc_cap_discharge_voltage(di, true);
1565
1566 ab8500_fg_check_capacity_limits(di, true);
1567 }
1568
1569 di->init_cnt += sleep_time;
1570 if (di->init_cnt > di->bm->fg_params->init_total_time)
1571 ab8500_fg_discharge_state_to(di,
1572 AB8500_FG_DISCHARGE_READOUT_INIT);
1573
1574 break;
1575
1576 case AB8500_FG_DISCHARGE_INIT_RECOVERY:
1577 di->recovery_cnt = 0;
1578 di->recovery_needed = true;
1579 ab8500_fg_discharge_state_to(di,
1580 AB8500_FG_DISCHARGE_RECOVERY);
1581
1582 /* Intentional fallthrough */
1583
1584 case AB8500_FG_DISCHARGE_RECOVERY:
1585 sleep_time = di->bm->fg_params->recovery_sleep_timer;
1586
1587 /*
1588 * We should check the power consumption
1589 * If low, go to READOUT (after x min) or
1590 * RECOVERY_SLEEP if time left.
1591 * If high, go to READOUT
1592 */
1593 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1594
1595 if (ab8500_fg_is_low_curr(di, di->inst_curr)) {
1596 if (di->recovery_cnt >
1597 di->bm->fg_params->recovery_total_time) {
1598 di->fg_samples = SEC_TO_SAMPLE(
1599 di->bm->fg_params->accu_high_curr);
1600 ab8500_fg_coulomb_counter(di, true);
1601 ab8500_fg_discharge_state_to(di,
1602 AB8500_FG_DISCHARGE_READOUT);
1603 di->recovery_needed = false;
1604 } else {
1605 queue_delayed_work(di->fg_wq,
1606 &di->fg_periodic_work,
1607 sleep_time * HZ);
1608 }
1609 di->recovery_cnt += sleep_time;
1610 } else {
1611 di->fg_samples = SEC_TO_SAMPLE(
1612 di->bm->fg_params->accu_high_curr);
1613 ab8500_fg_coulomb_counter(di, true);
1614 ab8500_fg_discharge_state_to(di,
1615 AB8500_FG_DISCHARGE_READOUT);
1616 }
1617 break;
1618
1619 case AB8500_FG_DISCHARGE_READOUT_INIT:
1620 di->fg_samples = SEC_TO_SAMPLE(
1621 di->bm->fg_params->accu_high_curr);
1622 ab8500_fg_coulomb_counter(di, true);
1623 ab8500_fg_discharge_state_to(di,
1624 AB8500_FG_DISCHARGE_READOUT);
1625 break;
1626
1627 case AB8500_FG_DISCHARGE_READOUT:
1628 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1629
1630 if (ab8500_fg_is_low_curr(di, di->inst_curr)) {
1631 /* Detect mode change */
1632 if (di->high_curr_mode) {
1633 di->high_curr_mode = false;
1634 di->high_curr_cnt = 0;
1635 }
1636
1637 if (di->recovery_needed) {
1638 ab8500_fg_discharge_state_to(di,
1639 AB8500_FG_DISCHARGE_INIT_RECOVERY);
1640
1641 queue_delayed_work(di->fg_wq,
1642 &di->fg_periodic_work, 0);
1643
1644 break;
1645 }
1646
1647 ab8500_fg_calc_cap_discharge_voltage(di, true);
1648 } else {
1649 mutex_lock(&di->cc_lock);
1650 if (!di->flags.conv_done) {
1651 /* Wasn't the CC IRQ that got us here */
1652 mutex_unlock(&di->cc_lock);
1653 dev_dbg(di->dev, "%s CC conv not done\n",
1654 __func__);
1655
1656 break;
1657 }
1658 di->flags.conv_done = false;
1659 mutex_unlock(&di->cc_lock);
1660
1661 /* Detect mode change */
1662 if (!di->high_curr_mode) {
1663 di->high_curr_mode = true;
1664 di->high_curr_cnt = 0;
1665 }
1666
1667 di->high_curr_cnt +=
1668 di->bm->fg_params->accu_high_curr;
1669 if (di->high_curr_cnt >
1670 di->bm->fg_params->high_curr_time)
1671 di->recovery_needed = true;
1672
1673 ab8500_fg_calc_cap_discharge_fg(di);
1674 }
1675
1676 ab8500_fg_check_capacity_limits(di, false);
1677
1678 break;
1679
1680 case AB8500_FG_DISCHARGE_WAKEUP:
1681 ab8500_fg_calc_cap_discharge_voltage(di, true);
1682
1683 di->fg_samples = SEC_TO_SAMPLE(
1684 di->bm->fg_params->accu_high_curr);
1685 ab8500_fg_coulomb_counter(di, true);
1686 ab8500_fg_discharge_state_to(di,
1687 AB8500_FG_DISCHARGE_READOUT);
1688
1689 ab8500_fg_check_capacity_limits(di, false);
1690
1691 break;
1692
1693 default:
1694 break;
1695 }
1696 }
1697
1698 /**
1699 * ab8500_fg_algorithm_calibrate() - Internal columb counter offset calibration
1700 * @di: pointer to the ab8500_fg structure
1701 *
1702 */
ab8500_fg_algorithm_calibrate(struct ab8500_fg * di)1703 static void ab8500_fg_algorithm_calibrate(struct ab8500_fg *di)
1704 {
1705 int ret;
1706
1707 switch (di->calib_state) {
1708 case AB8500_FG_CALIB_INIT:
1709 dev_dbg(di->dev, "Calibration ongoing...\n");
1710
1711 ret = abx500_mask_and_set_register_interruptible(di->dev,
1712 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1713 CC_INT_CAL_N_AVG_MASK, CC_INT_CAL_SAMPLES_8);
1714 if (ret < 0)
1715 goto err;
1716
1717 ret = abx500_mask_and_set_register_interruptible(di->dev,
1718 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1719 CC_INTAVGOFFSET_ENA, CC_INTAVGOFFSET_ENA);
1720 if (ret < 0)
1721 goto err;
1722 di->calib_state = AB8500_FG_CALIB_WAIT;
1723 break;
1724 case AB8500_FG_CALIB_END:
1725 ret = abx500_mask_and_set_register_interruptible(di->dev,
1726 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1727 CC_MUXOFFSET, CC_MUXOFFSET);
1728 if (ret < 0)
1729 goto err;
1730 di->flags.calibrate = false;
1731 dev_dbg(di->dev, "Calibration done...\n");
1732 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1733 break;
1734 case AB8500_FG_CALIB_WAIT:
1735 dev_dbg(di->dev, "Calibration WFI\n");
1736 default:
1737 break;
1738 }
1739 return;
1740 err:
1741 /* Something went wrong, don't calibrate then */
1742 dev_err(di->dev, "failed to calibrate the CC\n");
1743 di->flags.calibrate = false;
1744 di->calib_state = AB8500_FG_CALIB_INIT;
1745 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1746 }
1747
1748 /**
1749 * ab8500_fg_algorithm() - Entry point for the FG algorithm
1750 * @di: pointer to the ab8500_fg structure
1751 *
1752 * Entry point for the battery capacity calculation state machine
1753 */
ab8500_fg_algorithm(struct ab8500_fg * di)1754 static void ab8500_fg_algorithm(struct ab8500_fg *di)
1755 {
1756 if (di->flags.calibrate)
1757 ab8500_fg_algorithm_calibrate(di);
1758 else {
1759 if (di->flags.charging)
1760 ab8500_fg_algorithm_charging(di);
1761 else
1762 ab8500_fg_algorithm_discharging(di);
1763 }
1764
1765 dev_dbg(di->dev, "[FG_DATA] %d %d %d %d %d %d %d %d %d %d "
1766 "%d %d %d %d %d %d %d\n",
1767 di->bat_cap.max_mah_design,
1768 di->bat_cap.max_mah,
1769 di->bat_cap.mah,
1770 di->bat_cap.permille,
1771 di->bat_cap.level,
1772 di->bat_cap.prev_mah,
1773 di->bat_cap.prev_percent,
1774 di->bat_cap.prev_level,
1775 di->vbat,
1776 di->inst_curr,
1777 di->avg_curr,
1778 di->accu_charge,
1779 di->flags.charging,
1780 di->charge_state,
1781 di->discharge_state,
1782 di->high_curr_mode,
1783 di->recovery_needed);
1784 }
1785
1786 /**
1787 * ab8500_fg_periodic_work() - Run the FG state machine periodically
1788 * @work: pointer to the work_struct structure
1789 *
1790 * Work queue function for periodic work
1791 */
ab8500_fg_periodic_work(struct work_struct * work)1792 static void ab8500_fg_periodic_work(struct work_struct *work)
1793 {
1794 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1795 fg_periodic_work.work);
1796
1797 if (di->init_capacity) {
1798 /* Get an initial capacity calculation */
1799 ab8500_fg_calc_cap_discharge_voltage(di, true);
1800 ab8500_fg_check_capacity_limits(di, true);
1801 di->init_capacity = false;
1802
1803 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1804 } else if (di->flags.user_cap) {
1805 if (check_sysfs_capacity(di)) {
1806 ab8500_fg_check_capacity_limits(di, true);
1807 if (di->flags.charging)
1808 ab8500_fg_charge_state_to(di,
1809 AB8500_FG_CHARGE_INIT);
1810 else
1811 ab8500_fg_discharge_state_to(di,
1812 AB8500_FG_DISCHARGE_READOUT_INIT);
1813 }
1814 di->flags.user_cap = false;
1815 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1816 } else
1817 ab8500_fg_algorithm(di);
1818
1819 }
1820
1821 /**
1822 * ab8500_fg_check_hw_failure_work() - Check OVV_BAT condition
1823 * @work: pointer to the work_struct structure
1824 *
1825 * Work queue function for checking the OVV_BAT condition
1826 */
ab8500_fg_check_hw_failure_work(struct work_struct * work)1827 static void ab8500_fg_check_hw_failure_work(struct work_struct *work)
1828 {
1829 int ret;
1830 u8 reg_value;
1831
1832 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1833 fg_check_hw_failure_work.work);
1834
1835 /*
1836 * If we have had a battery over-voltage situation,
1837 * check ovv-bit to see if it should be reset.
1838 */
1839 ret = abx500_get_register_interruptible(di->dev,
1840 AB8500_CHARGER, AB8500_CH_STAT_REG,
1841 ®_value);
1842 if (ret < 0) {
1843 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1844 return;
1845 }
1846 if ((reg_value & BATT_OVV) == BATT_OVV) {
1847 if (!di->flags.bat_ovv) {
1848 dev_dbg(di->dev, "Battery OVV\n");
1849 di->flags.bat_ovv = true;
1850 power_supply_changed(di->fg_psy);
1851 }
1852 /* Not yet recovered from ovv, reschedule this test */
1853 queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work,
1854 HZ);
1855 } else {
1856 dev_dbg(di->dev, "Battery recovered from OVV\n");
1857 di->flags.bat_ovv = false;
1858 power_supply_changed(di->fg_psy);
1859 }
1860 }
1861
1862 /**
1863 * ab8500_fg_low_bat_work() - Check LOW_BAT condition
1864 * @work: pointer to the work_struct structure
1865 *
1866 * Work queue function for checking the LOW_BAT condition
1867 */
ab8500_fg_low_bat_work(struct work_struct * work)1868 static void ab8500_fg_low_bat_work(struct work_struct *work)
1869 {
1870 int vbat;
1871
1872 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1873 fg_low_bat_work.work);
1874
1875 vbat = ab8500_fg_bat_voltage(di);
1876
1877 /* Check if LOW_BAT still fulfilled */
1878 if (vbat < di->bm->fg_params->lowbat_threshold) {
1879 /* Is it time to shut down? */
1880 if (di->low_bat_cnt < 1) {
1881 di->flags.low_bat = true;
1882 dev_warn(di->dev, "Shut down pending...\n");
1883 } else {
1884 /*
1885 * Else we need to re-schedule this check to be able to detect
1886 * if the voltage increases again during charging or
1887 * due to decreasing load.
1888 */
1889 di->low_bat_cnt--;
1890 dev_warn(di->dev, "Battery voltage still LOW\n");
1891 queue_delayed_work(di->fg_wq, &di->fg_low_bat_work,
1892 round_jiffies(LOW_BAT_CHECK_INTERVAL));
1893 }
1894 } else {
1895 di->flags.low_bat_delay = false;
1896 di->low_bat_cnt = 10;
1897 dev_warn(di->dev, "Battery voltage OK again\n");
1898 }
1899
1900 /* This is needed to dispatch LOW_BAT */
1901 ab8500_fg_check_capacity_limits(di, false);
1902 }
1903
1904 /**
1905 * ab8500_fg_battok_calc - calculate the bit pattern corresponding
1906 * to the target voltage.
1907 * @di: pointer to the ab8500_fg structure
1908 * @target target voltage
1909 *
1910 * Returns bit pattern closest to the target voltage
1911 * valid return values are 0-14. (0-BATT_OK_MAX_NR_INCREMENTS)
1912 */
1913
ab8500_fg_battok_calc(struct ab8500_fg * di,int target)1914 static int ab8500_fg_battok_calc(struct ab8500_fg *di, int target)
1915 {
1916 if (target > BATT_OK_MIN +
1917 (BATT_OK_INCREMENT * BATT_OK_MAX_NR_INCREMENTS))
1918 return BATT_OK_MAX_NR_INCREMENTS;
1919 if (target < BATT_OK_MIN)
1920 return 0;
1921 return (target - BATT_OK_MIN) / BATT_OK_INCREMENT;
1922 }
1923
1924 /**
1925 * ab8500_fg_battok_init_hw_register - init battok levels
1926 * @di: pointer to the ab8500_fg structure
1927 *
1928 */
1929
ab8500_fg_battok_init_hw_register(struct ab8500_fg * di)1930 static int ab8500_fg_battok_init_hw_register(struct ab8500_fg *di)
1931 {
1932 int selected;
1933 int sel0;
1934 int sel1;
1935 int cbp_sel0;
1936 int cbp_sel1;
1937 int ret;
1938 int new_val;
1939
1940 sel0 = di->bm->fg_params->battok_falling_th_sel0;
1941 sel1 = di->bm->fg_params->battok_raising_th_sel1;
1942
1943 cbp_sel0 = ab8500_fg_battok_calc(di, sel0);
1944 cbp_sel1 = ab8500_fg_battok_calc(di, sel1);
1945
1946 selected = BATT_OK_MIN + cbp_sel0 * BATT_OK_INCREMENT;
1947
1948 if (selected != sel0)
1949 dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n",
1950 sel0, selected, cbp_sel0);
1951
1952 selected = BATT_OK_MIN + cbp_sel1 * BATT_OK_INCREMENT;
1953
1954 if (selected != sel1)
1955 dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n",
1956 sel1, selected, cbp_sel1);
1957
1958 new_val = cbp_sel0 | (cbp_sel1 << 4);
1959
1960 dev_dbg(di->dev, "using: %x %d %d\n", new_val, cbp_sel0, cbp_sel1);
1961 ret = abx500_set_register_interruptible(di->dev, AB8500_SYS_CTRL2_BLOCK,
1962 AB8500_BATT_OK_REG, new_val);
1963 return ret;
1964 }
1965
1966 /**
1967 * ab8500_fg_instant_work() - Run the FG state machine instantly
1968 * @work: pointer to the work_struct structure
1969 *
1970 * Work queue function for instant work
1971 */
ab8500_fg_instant_work(struct work_struct * work)1972 static void ab8500_fg_instant_work(struct work_struct *work)
1973 {
1974 struct ab8500_fg *di = container_of(work, struct ab8500_fg, fg_work);
1975
1976 ab8500_fg_algorithm(di);
1977 }
1978
1979 /**
1980 * ab8500_fg_cc_data_end_handler() - end of data conversion isr.
1981 * @irq: interrupt number
1982 * @_di: pointer to the ab8500_fg structure
1983 *
1984 * Returns IRQ status(IRQ_HANDLED)
1985 */
ab8500_fg_cc_data_end_handler(int irq,void * _di)1986 static irqreturn_t ab8500_fg_cc_data_end_handler(int irq, void *_di)
1987 {
1988 struct ab8500_fg *di = _di;
1989 if (!di->nbr_cceoc_irq_cnt) {
1990 di->nbr_cceoc_irq_cnt++;
1991 complete(&di->ab8500_fg_started);
1992 } else {
1993 di->nbr_cceoc_irq_cnt = 0;
1994 complete(&di->ab8500_fg_complete);
1995 }
1996 return IRQ_HANDLED;
1997 }
1998
1999 /**
2000 * ab8500_fg_cc_int_calib_handler () - end of calibration isr.
2001 * @irq: interrupt number
2002 * @_di: pointer to the ab8500_fg structure
2003 *
2004 * Returns IRQ status(IRQ_HANDLED)
2005 */
ab8500_fg_cc_int_calib_handler(int irq,void * _di)2006 static irqreturn_t ab8500_fg_cc_int_calib_handler(int irq, void *_di)
2007 {
2008 struct ab8500_fg *di = _di;
2009 di->calib_state = AB8500_FG_CALIB_END;
2010 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2011 return IRQ_HANDLED;
2012 }
2013
2014 /**
2015 * ab8500_fg_cc_convend_handler() - isr to get battery avg current.
2016 * @irq: interrupt number
2017 * @_di: pointer to the ab8500_fg structure
2018 *
2019 * Returns IRQ status(IRQ_HANDLED)
2020 */
ab8500_fg_cc_convend_handler(int irq,void * _di)2021 static irqreturn_t ab8500_fg_cc_convend_handler(int irq, void *_di)
2022 {
2023 struct ab8500_fg *di = _di;
2024
2025 queue_work(di->fg_wq, &di->fg_acc_cur_work);
2026
2027 return IRQ_HANDLED;
2028 }
2029
2030 /**
2031 * ab8500_fg_batt_ovv_handler() - Battery OVV occured
2032 * @irq: interrupt number
2033 * @_di: pointer to the ab8500_fg structure
2034 *
2035 * Returns IRQ status(IRQ_HANDLED)
2036 */
ab8500_fg_batt_ovv_handler(int irq,void * _di)2037 static irqreturn_t ab8500_fg_batt_ovv_handler(int irq, void *_di)
2038 {
2039 struct ab8500_fg *di = _di;
2040
2041 dev_dbg(di->dev, "Battery OVV\n");
2042
2043 /* Schedule a new HW failure check */
2044 queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work, 0);
2045
2046 return IRQ_HANDLED;
2047 }
2048
2049 /**
2050 * ab8500_fg_lowbatf_handler() - Battery voltage is below LOW threshold
2051 * @irq: interrupt number
2052 * @_di: pointer to the ab8500_fg structure
2053 *
2054 * Returns IRQ status(IRQ_HANDLED)
2055 */
ab8500_fg_lowbatf_handler(int irq,void * _di)2056 static irqreturn_t ab8500_fg_lowbatf_handler(int irq, void *_di)
2057 {
2058 struct ab8500_fg *di = _di;
2059
2060 /* Initiate handling in ab8500_fg_low_bat_work() if not already initiated. */
2061 if (!di->flags.low_bat_delay) {
2062 dev_warn(di->dev, "Battery voltage is below LOW threshold\n");
2063 di->flags.low_bat_delay = true;
2064 /*
2065 * Start a timer to check LOW_BAT again after some time
2066 * This is done to avoid shutdown on single voltage dips
2067 */
2068 queue_delayed_work(di->fg_wq, &di->fg_low_bat_work,
2069 round_jiffies(LOW_BAT_CHECK_INTERVAL));
2070 }
2071 return IRQ_HANDLED;
2072 }
2073
2074 /**
2075 * ab8500_fg_get_property() - get the fg properties
2076 * @psy: pointer to the power_supply structure
2077 * @psp: pointer to the power_supply_property structure
2078 * @val: pointer to the power_supply_propval union
2079 *
2080 * This function gets called when an application tries to get the
2081 * fg properties by reading the sysfs files.
2082 * voltage_now: battery voltage
2083 * current_now: battery instant current
2084 * current_avg: battery average current
2085 * charge_full_design: capacity where battery is considered full
2086 * charge_now: battery capacity in nAh
2087 * capacity: capacity in percent
2088 * capacity_level: capacity level
2089 *
2090 * Returns error code in case of failure else 0 on success
2091 */
ab8500_fg_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)2092 static int ab8500_fg_get_property(struct power_supply *psy,
2093 enum power_supply_property psp,
2094 union power_supply_propval *val)
2095 {
2096 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2097
2098 /*
2099 * If battery is identified as unknown and charging of unknown
2100 * batteries is disabled, we always report 100% capacity and
2101 * capacity level UNKNOWN, since we can't calculate
2102 * remaining capacity
2103 */
2104
2105 switch (psp) {
2106 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
2107 if (di->flags.bat_ovv)
2108 val->intval = BATT_OVV_VALUE * 1000;
2109 else
2110 val->intval = di->vbat * 1000;
2111 break;
2112 case POWER_SUPPLY_PROP_CURRENT_NOW:
2113 val->intval = di->inst_curr * 1000;
2114 break;
2115 case POWER_SUPPLY_PROP_CURRENT_AVG:
2116 val->intval = di->avg_curr * 1000;
2117 break;
2118 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
2119 val->intval = ab8500_fg_convert_mah_to_uwh(di,
2120 di->bat_cap.max_mah_design);
2121 break;
2122 case POWER_SUPPLY_PROP_ENERGY_FULL:
2123 val->intval = ab8500_fg_convert_mah_to_uwh(di,
2124 di->bat_cap.max_mah);
2125 break;
2126 case POWER_SUPPLY_PROP_ENERGY_NOW:
2127 if (di->flags.batt_unknown && !di->bm->chg_unknown_bat &&
2128 di->flags.batt_id_received)
2129 val->intval = ab8500_fg_convert_mah_to_uwh(di,
2130 di->bat_cap.max_mah);
2131 else
2132 val->intval = ab8500_fg_convert_mah_to_uwh(di,
2133 di->bat_cap.prev_mah);
2134 break;
2135 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
2136 val->intval = di->bat_cap.max_mah_design;
2137 break;
2138 case POWER_SUPPLY_PROP_CHARGE_FULL:
2139 val->intval = di->bat_cap.max_mah;
2140 break;
2141 case POWER_SUPPLY_PROP_CHARGE_NOW:
2142 if (di->flags.batt_unknown && !di->bm->chg_unknown_bat &&
2143 di->flags.batt_id_received)
2144 val->intval = di->bat_cap.max_mah;
2145 else
2146 val->intval = di->bat_cap.prev_mah;
2147 break;
2148 case POWER_SUPPLY_PROP_CAPACITY:
2149 if (di->flags.batt_unknown && !di->bm->chg_unknown_bat &&
2150 di->flags.batt_id_received)
2151 val->intval = 100;
2152 else
2153 val->intval = di->bat_cap.prev_percent;
2154 break;
2155 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
2156 if (di->flags.batt_unknown && !di->bm->chg_unknown_bat &&
2157 di->flags.batt_id_received)
2158 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
2159 else
2160 val->intval = di->bat_cap.prev_level;
2161 break;
2162 default:
2163 return -EINVAL;
2164 }
2165 return 0;
2166 }
2167
ab8500_fg_get_ext_psy_data(struct device * dev,void * data)2168 static int ab8500_fg_get_ext_psy_data(struct device *dev, void *data)
2169 {
2170 struct power_supply *psy;
2171 struct power_supply *ext;
2172 struct ab8500_fg *di;
2173 union power_supply_propval ret;
2174 int i, j;
2175 bool psy_found = false;
2176
2177 psy = (struct power_supply *)data;
2178 ext = dev_get_drvdata(dev);
2179 di = power_supply_get_drvdata(psy);
2180
2181 /*
2182 * For all psy where the name of your driver
2183 * appears in any supplied_to
2184 */
2185 for (i = 0; i < ext->num_supplicants; i++) {
2186 if (!strcmp(ext->supplied_to[i], psy->desc->name))
2187 psy_found = true;
2188 }
2189
2190 if (!psy_found)
2191 return 0;
2192
2193 /* Go through all properties for the psy */
2194 for (j = 0; j < ext->desc->num_properties; j++) {
2195 enum power_supply_property prop;
2196 prop = ext->desc->properties[j];
2197
2198 if (power_supply_get_property(ext, prop, &ret))
2199 continue;
2200
2201 switch (prop) {
2202 case POWER_SUPPLY_PROP_STATUS:
2203 switch (ext->desc->type) {
2204 case POWER_SUPPLY_TYPE_BATTERY:
2205 switch (ret.intval) {
2206 case POWER_SUPPLY_STATUS_UNKNOWN:
2207 case POWER_SUPPLY_STATUS_DISCHARGING:
2208 case POWER_SUPPLY_STATUS_NOT_CHARGING:
2209 if (!di->flags.charging)
2210 break;
2211 di->flags.charging = false;
2212 di->flags.fully_charged = false;
2213 if (di->bm->capacity_scaling)
2214 ab8500_fg_update_cap_scalers(di);
2215 queue_work(di->fg_wq, &di->fg_work);
2216 break;
2217 case POWER_SUPPLY_STATUS_FULL:
2218 if (di->flags.fully_charged)
2219 break;
2220 di->flags.fully_charged = true;
2221 di->flags.force_full = true;
2222 /* Save current capacity as maximum */
2223 di->bat_cap.max_mah = di->bat_cap.mah;
2224 queue_work(di->fg_wq, &di->fg_work);
2225 break;
2226 case POWER_SUPPLY_STATUS_CHARGING:
2227 if (di->flags.charging &&
2228 !di->flags.fully_charged)
2229 break;
2230 di->flags.charging = true;
2231 di->flags.fully_charged = false;
2232 if (di->bm->capacity_scaling)
2233 ab8500_fg_update_cap_scalers(di);
2234 queue_work(di->fg_wq, &di->fg_work);
2235 break;
2236 };
2237 default:
2238 break;
2239 };
2240 break;
2241 case POWER_SUPPLY_PROP_TECHNOLOGY:
2242 switch (ext->desc->type) {
2243 case POWER_SUPPLY_TYPE_BATTERY:
2244 if (!di->flags.batt_id_received &&
2245 di->bm->batt_id != BATTERY_UNKNOWN) {
2246 const struct abx500_battery_type *b;
2247
2248 b = &(di->bm->bat_type[di->bm->batt_id]);
2249
2250 di->flags.batt_id_received = true;
2251
2252 di->bat_cap.max_mah_design =
2253 MILLI_TO_MICRO *
2254 b->charge_full_design;
2255
2256 di->bat_cap.max_mah =
2257 di->bat_cap.max_mah_design;
2258
2259 di->vbat_nom = b->nominal_voltage;
2260 }
2261
2262 if (ret.intval)
2263 di->flags.batt_unknown = false;
2264 else
2265 di->flags.batt_unknown = true;
2266 break;
2267 default:
2268 break;
2269 }
2270 break;
2271 case POWER_SUPPLY_PROP_TEMP:
2272 switch (ext->desc->type) {
2273 case POWER_SUPPLY_TYPE_BATTERY:
2274 if (di->flags.batt_id_received)
2275 di->bat_temp = ret.intval;
2276 break;
2277 default:
2278 break;
2279 }
2280 break;
2281 default:
2282 break;
2283 }
2284 }
2285 return 0;
2286 }
2287
2288 /**
2289 * ab8500_fg_init_hw_registers() - Set up FG related registers
2290 * @di: pointer to the ab8500_fg structure
2291 *
2292 * Set up battery OVV, low battery voltage registers
2293 */
ab8500_fg_init_hw_registers(struct ab8500_fg * di)2294 static int ab8500_fg_init_hw_registers(struct ab8500_fg *di)
2295 {
2296 int ret;
2297
2298 /* Set VBAT OVV threshold */
2299 ret = abx500_mask_and_set_register_interruptible(di->dev,
2300 AB8500_CHARGER,
2301 AB8500_BATT_OVV,
2302 BATT_OVV_TH_4P75,
2303 BATT_OVV_TH_4P75);
2304 if (ret) {
2305 dev_err(di->dev, "failed to set BATT_OVV\n");
2306 goto out;
2307 }
2308
2309 /* Enable VBAT OVV detection */
2310 ret = abx500_mask_and_set_register_interruptible(di->dev,
2311 AB8500_CHARGER,
2312 AB8500_BATT_OVV,
2313 BATT_OVV_ENA,
2314 BATT_OVV_ENA);
2315 if (ret) {
2316 dev_err(di->dev, "failed to enable BATT_OVV\n");
2317 goto out;
2318 }
2319
2320 /* Low Battery Voltage */
2321 ret = abx500_set_register_interruptible(di->dev,
2322 AB8500_SYS_CTRL2_BLOCK,
2323 AB8500_LOW_BAT_REG,
2324 ab8500_volt_to_regval(
2325 di->bm->fg_params->lowbat_threshold) << 1 |
2326 LOW_BAT_ENABLE);
2327 if (ret) {
2328 dev_err(di->dev, "%s write failed\n", __func__);
2329 goto out;
2330 }
2331
2332 /* Battery OK threshold */
2333 ret = ab8500_fg_battok_init_hw_register(di);
2334 if (ret) {
2335 dev_err(di->dev, "BattOk init write failed.\n");
2336 goto out;
2337 }
2338
2339 if (((is_ab8505(di->parent) || is_ab9540(di->parent)) &&
2340 abx500_get_chip_id(di->dev) >= AB8500_CUT2P0)
2341 || is_ab8540(di->parent)) {
2342 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2343 AB8505_RTC_PCUT_MAX_TIME_REG, di->bm->fg_params->pcut_max_time);
2344
2345 if (ret) {
2346 dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_MAX_TIME_REG\n", __func__);
2347 goto out;
2348 };
2349
2350 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2351 AB8505_RTC_PCUT_FLAG_TIME_REG, di->bm->fg_params->pcut_flag_time);
2352
2353 if (ret) {
2354 dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_FLAG_TIME_REG\n", __func__);
2355 goto out;
2356 };
2357
2358 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2359 AB8505_RTC_PCUT_RESTART_REG, di->bm->fg_params->pcut_max_restart);
2360
2361 if (ret) {
2362 dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_RESTART_REG\n", __func__);
2363 goto out;
2364 };
2365
2366 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2367 AB8505_RTC_PCUT_DEBOUNCE_REG, di->bm->fg_params->pcut_debounce_time);
2368
2369 if (ret) {
2370 dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_DEBOUNCE_REG\n", __func__);
2371 goto out;
2372 };
2373
2374 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2375 AB8505_RTC_PCUT_CTL_STATUS_REG, di->bm->fg_params->pcut_enable);
2376
2377 if (ret) {
2378 dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_CTL_STATUS_REG\n", __func__);
2379 goto out;
2380 };
2381 }
2382 out:
2383 return ret;
2384 }
2385
2386 /**
2387 * ab8500_fg_external_power_changed() - callback for power supply changes
2388 * @psy: pointer to the structure power_supply
2389 *
2390 * This function is the entry point of the pointer external_power_changed
2391 * of the structure power_supply.
2392 * This function gets executed when there is a change in any external power
2393 * supply that this driver needs to be notified of.
2394 */
ab8500_fg_external_power_changed(struct power_supply * psy)2395 static void ab8500_fg_external_power_changed(struct power_supply *psy)
2396 {
2397 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2398
2399 class_for_each_device(power_supply_class, NULL,
2400 di->fg_psy, ab8500_fg_get_ext_psy_data);
2401 }
2402
2403 /**
2404 * abab8500_fg_reinit_work() - work to reset the FG algorithm
2405 * @work: pointer to the work_struct structure
2406 *
2407 * Used to reset the current battery capacity to be able to
2408 * retrigger a new voltage base capacity calculation. For
2409 * test and verification purpose.
2410 */
ab8500_fg_reinit_work(struct work_struct * work)2411 static void ab8500_fg_reinit_work(struct work_struct *work)
2412 {
2413 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
2414 fg_reinit_work.work);
2415
2416 if (di->flags.calibrate == false) {
2417 dev_dbg(di->dev, "Resetting FG state machine to init.\n");
2418 ab8500_fg_clear_cap_samples(di);
2419 ab8500_fg_calc_cap_discharge_voltage(di, true);
2420 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
2421 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT);
2422 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2423
2424 } else {
2425 dev_err(di->dev, "Residual offset calibration ongoing "
2426 "retrying..\n");
2427 /* Wait one second until next try*/
2428 queue_delayed_work(di->fg_wq, &di->fg_reinit_work,
2429 round_jiffies(1));
2430 }
2431 }
2432
2433 /* Exposure to the sysfs interface */
2434
2435 struct ab8500_fg_sysfs_entry {
2436 struct attribute attr;
2437 ssize_t (*show)(struct ab8500_fg *, char *);
2438 ssize_t (*store)(struct ab8500_fg *, const char *, size_t);
2439 };
2440
charge_full_show(struct ab8500_fg * di,char * buf)2441 static ssize_t charge_full_show(struct ab8500_fg *di, char *buf)
2442 {
2443 return sprintf(buf, "%d\n", di->bat_cap.max_mah);
2444 }
2445
charge_full_store(struct ab8500_fg * di,const char * buf,size_t count)2446 static ssize_t charge_full_store(struct ab8500_fg *di, const char *buf,
2447 size_t count)
2448 {
2449 unsigned long charge_full;
2450 ssize_t ret;
2451
2452 ret = kstrtoul(buf, 10, &charge_full);
2453
2454 dev_dbg(di->dev, "Ret %zd charge_full %lu", ret, charge_full);
2455
2456 if (!ret) {
2457 di->bat_cap.max_mah = (int) charge_full;
2458 ret = count;
2459 }
2460 return ret;
2461 }
2462
charge_now_show(struct ab8500_fg * di,char * buf)2463 static ssize_t charge_now_show(struct ab8500_fg *di, char *buf)
2464 {
2465 return sprintf(buf, "%d\n", di->bat_cap.prev_mah);
2466 }
2467
charge_now_store(struct ab8500_fg * di,const char * buf,size_t count)2468 static ssize_t charge_now_store(struct ab8500_fg *di, const char *buf,
2469 size_t count)
2470 {
2471 unsigned long charge_now;
2472 ssize_t ret;
2473
2474 ret = kstrtoul(buf, 10, &charge_now);
2475
2476 dev_dbg(di->dev, "Ret %zd charge_now %lu was %d",
2477 ret, charge_now, di->bat_cap.prev_mah);
2478
2479 if (!ret) {
2480 di->bat_cap.user_mah = (int) charge_now;
2481 di->flags.user_cap = true;
2482 ret = count;
2483 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2484 }
2485 return ret;
2486 }
2487
2488 static struct ab8500_fg_sysfs_entry charge_full_attr =
2489 __ATTR(charge_full, 0644, charge_full_show, charge_full_store);
2490
2491 static struct ab8500_fg_sysfs_entry charge_now_attr =
2492 __ATTR(charge_now, 0644, charge_now_show, charge_now_store);
2493
2494 static ssize_t
ab8500_fg_show(struct kobject * kobj,struct attribute * attr,char * buf)2495 ab8500_fg_show(struct kobject *kobj, struct attribute *attr, char *buf)
2496 {
2497 struct ab8500_fg_sysfs_entry *entry;
2498 struct ab8500_fg *di;
2499
2500 entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr);
2501 di = container_of(kobj, struct ab8500_fg, fg_kobject);
2502
2503 if (!entry->show)
2504 return -EIO;
2505
2506 return entry->show(di, buf);
2507 }
2508 static ssize_t
ab8500_fg_store(struct kobject * kobj,struct attribute * attr,const char * buf,size_t count)2509 ab8500_fg_store(struct kobject *kobj, struct attribute *attr, const char *buf,
2510 size_t count)
2511 {
2512 struct ab8500_fg_sysfs_entry *entry;
2513 struct ab8500_fg *di;
2514
2515 entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr);
2516 di = container_of(kobj, struct ab8500_fg, fg_kobject);
2517
2518 if (!entry->store)
2519 return -EIO;
2520
2521 return entry->store(di, buf, count);
2522 }
2523
2524 static const struct sysfs_ops ab8500_fg_sysfs_ops = {
2525 .show = ab8500_fg_show,
2526 .store = ab8500_fg_store,
2527 };
2528
2529 static struct attribute *ab8500_fg_attrs[] = {
2530 &charge_full_attr.attr,
2531 &charge_now_attr.attr,
2532 NULL,
2533 };
2534
2535 static struct kobj_type ab8500_fg_ktype = {
2536 .sysfs_ops = &ab8500_fg_sysfs_ops,
2537 .default_attrs = ab8500_fg_attrs,
2538 };
2539
2540 /**
2541 * ab8500_chargalg_sysfs_exit() - de-init of sysfs entry
2542 * @di: pointer to the struct ab8500_chargalg
2543 *
2544 * This function removes the entry in sysfs.
2545 */
ab8500_fg_sysfs_exit(struct ab8500_fg * di)2546 static void ab8500_fg_sysfs_exit(struct ab8500_fg *di)
2547 {
2548 kobject_del(&di->fg_kobject);
2549 }
2550
2551 /**
2552 * ab8500_chargalg_sysfs_init() - init of sysfs entry
2553 * @di: pointer to the struct ab8500_chargalg
2554 *
2555 * This function adds an entry in sysfs.
2556 * Returns error code in case of failure else 0(on success)
2557 */
ab8500_fg_sysfs_init(struct ab8500_fg * di)2558 static int ab8500_fg_sysfs_init(struct ab8500_fg *di)
2559 {
2560 int ret = 0;
2561
2562 ret = kobject_init_and_add(&di->fg_kobject,
2563 &ab8500_fg_ktype,
2564 NULL, "battery");
2565 if (ret < 0)
2566 dev_err(di->dev, "failed to create sysfs entry\n");
2567
2568 return ret;
2569 }
2570
ab8505_powercut_flagtime_read(struct device * dev,struct device_attribute * attr,char * buf)2571 static ssize_t ab8505_powercut_flagtime_read(struct device *dev,
2572 struct device_attribute *attr,
2573 char *buf)
2574 {
2575 int ret;
2576 u8 reg_value;
2577 struct power_supply *psy = dev_get_drvdata(dev);
2578 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2579
2580 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2581 AB8505_RTC_PCUT_FLAG_TIME_REG, ®_value);
2582
2583 if (ret < 0) {
2584 dev_err(dev, "Failed to read AB8505_RTC_PCUT_FLAG_TIME_REG\n");
2585 goto fail;
2586 }
2587
2588 return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7F));
2589
2590 fail:
2591 return ret;
2592 }
2593
ab8505_powercut_flagtime_write(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)2594 static ssize_t ab8505_powercut_flagtime_write(struct device *dev,
2595 struct device_attribute *attr,
2596 const char *buf, size_t count)
2597 {
2598 int ret;
2599 long unsigned reg_value;
2600 struct power_supply *psy = dev_get_drvdata(dev);
2601 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2602
2603 reg_value = simple_strtoul(buf, NULL, 10);
2604
2605 if (reg_value > 0x7F) {
2606 dev_err(dev, "Incorrect parameter, echo 0 (1.98s) - 127 (15.625ms) for flagtime\n");
2607 goto fail;
2608 }
2609
2610 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2611 AB8505_RTC_PCUT_FLAG_TIME_REG, (u8)reg_value);
2612
2613 if (ret < 0)
2614 dev_err(dev, "Failed to set AB8505_RTC_PCUT_FLAG_TIME_REG\n");
2615
2616 fail:
2617 return count;
2618 }
2619
ab8505_powercut_maxtime_read(struct device * dev,struct device_attribute * attr,char * buf)2620 static ssize_t ab8505_powercut_maxtime_read(struct device *dev,
2621 struct device_attribute *attr,
2622 char *buf)
2623 {
2624 int ret;
2625 u8 reg_value;
2626 struct power_supply *psy = dev_get_drvdata(dev);
2627 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2628
2629 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2630 AB8505_RTC_PCUT_MAX_TIME_REG, ®_value);
2631
2632 if (ret < 0) {
2633 dev_err(dev, "Failed to read AB8505_RTC_PCUT_MAX_TIME_REG\n");
2634 goto fail;
2635 }
2636
2637 return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7F));
2638
2639 fail:
2640 return ret;
2641
2642 }
2643
ab8505_powercut_maxtime_write(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)2644 static ssize_t ab8505_powercut_maxtime_write(struct device *dev,
2645 struct device_attribute *attr,
2646 const char *buf, size_t count)
2647 {
2648 int ret;
2649 int reg_value;
2650 struct power_supply *psy = dev_get_drvdata(dev);
2651 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2652
2653 reg_value = simple_strtoul(buf, NULL, 10);
2654 if (reg_value > 0x7F) {
2655 dev_err(dev, "Incorrect parameter, echo 0 (0.0s) - 127 (1.98s) for maxtime\n");
2656 goto fail;
2657 }
2658
2659 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2660 AB8505_RTC_PCUT_MAX_TIME_REG, (u8)reg_value);
2661
2662 if (ret < 0)
2663 dev_err(dev, "Failed to set AB8505_RTC_PCUT_MAX_TIME_REG\n");
2664
2665 fail:
2666 return count;
2667 }
2668
ab8505_powercut_restart_read(struct device * dev,struct device_attribute * attr,char * buf)2669 static ssize_t ab8505_powercut_restart_read(struct device *dev,
2670 struct device_attribute *attr,
2671 char *buf)
2672 {
2673 int ret;
2674 u8 reg_value;
2675 struct power_supply *psy = dev_get_drvdata(dev);
2676 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2677
2678 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2679 AB8505_RTC_PCUT_RESTART_REG, ®_value);
2680
2681 if (ret < 0) {
2682 dev_err(dev, "Failed to read AB8505_RTC_PCUT_RESTART_REG\n");
2683 goto fail;
2684 }
2685
2686 return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0xF));
2687
2688 fail:
2689 return ret;
2690 }
2691
ab8505_powercut_restart_write(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)2692 static ssize_t ab8505_powercut_restart_write(struct device *dev,
2693 struct device_attribute *attr,
2694 const char *buf, size_t count)
2695 {
2696 int ret;
2697 int reg_value;
2698 struct power_supply *psy = dev_get_drvdata(dev);
2699 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2700
2701 reg_value = simple_strtoul(buf, NULL, 10);
2702 if (reg_value > 0xF) {
2703 dev_err(dev, "Incorrect parameter, echo 0 - 15 for number of restart\n");
2704 goto fail;
2705 }
2706
2707 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2708 AB8505_RTC_PCUT_RESTART_REG, (u8)reg_value);
2709
2710 if (ret < 0)
2711 dev_err(dev, "Failed to set AB8505_RTC_PCUT_RESTART_REG\n");
2712
2713 fail:
2714 return count;
2715
2716 }
2717
ab8505_powercut_timer_read(struct device * dev,struct device_attribute * attr,char * buf)2718 static ssize_t ab8505_powercut_timer_read(struct device *dev,
2719 struct device_attribute *attr,
2720 char *buf)
2721 {
2722 int ret;
2723 u8 reg_value;
2724 struct power_supply *psy = dev_get_drvdata(dev);
2725 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2726
2727 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2728 AB8505_RTC_PCUT_TIME_REG, ®_value);
2729
2730 if (ret < 0) {
2731 dev_err(dev, "Failed to read AB8505_RTC_PCUT_TIME_REG\n");
2732 goto fail;
2733 }
2734
2735 return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7F));
2736
2737 fail:
2738 return ret;
2739 }
2740
ab8505_powercut_restart_counter_read(struct device * dev,struct device_attribute * attr,char * buf)2741 static ssize_t ab8505_powercut_restart_counter_read(struct device *dev,
2742 struct device_attribute *attr,
2743 char *buf)
2744 {
2745 int ret;
2746 u8 reg_value;
2747 struct power_supply *psy = dev_get_drvdata(dev);
2748 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2749
2750 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2751 AB8505_RTC_PCUT_RESTART_REG, ®_value);
2752
2753 if (ret < 0) {
2754 dev_err(dev, "Failed to read AB8505_RTC_PCUT_RESTART_REG\n");
2755 goto fail;
2756 }
2757
2758 return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0xF0) >> 4);
2759
2760 fail:
2761 return ret;
2762 }
2763
ab8505_powercut_read(struct device * dev,struct device_attribute * attr,char * buf)2764 static ssize_t ab8505_powercut_read(struct device *dev,
2765 struct device_attribute *attr,
2766 char *buf)
2767 {
2768 int ret;
2769 u8 reg_value;
2770 struct power_supply *psy = dev_get_drvdata(dev);
2771 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2772
2773 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2774 AB8505_RTC_PCUT_CTL_STATUS_REG, ®_value);
2775
2776 if (ret < 0)
2777 goto fail;
2778
2779 return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x1));
2780
2781 fail:
2782 return ret;
2783 }
2784
ab8505_powercut_write(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)2785 static ssize_t ab8505_powercut_write(struct device *dev,
2786 struct device_attribute *attr,
2787 const char *buf, size_t count)
2788 {
2789 int ret;
2790 int reg_value;
2791 struct power_supply *psy = dev_get_drvdata(dev);
2792 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2793
2794 reg_value = simple_strtoul(buf, NULL, 10);
2795 if (reg_value > 0x1) {
2796 dev_err(dev, "Incorrect parameter, echo 0/1 to disable/enable Pcut feature\n");
2797 goto fail;
2798 }
2799
2800 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2801 AB8505_RTC_PCUT_CTL_STATUS_REG, (u8)reg_value);
2802
2803 if (ret < 0)
2804 dev_err(dev, "Failed to set AB8505_RTC_PCUT_CTL_STATUS_REG\n");
2805
2806 fail:
2807 return count;
2808 }
2809
ab8505_powercut_flag_read(struct device * dev,struct device_attribute * attr,char * buf)2810 static ssize_t ab8505_powercut_flag_read(struct device *dev,
2811 struct device_attribute *attr,
2812 char *buf)
2813 {
2814
2815 int ret;
2816 u8 reg_value;
2817 struct power_supply *psy = dev_get_drvdata(dev);
2818 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2819
2820 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2821 AB8505_RTC_PCUT_CTL_STATUS_REG, ®_value);
2822
2823 if (ret < 0) {
2824 dev_err(dev, "Failed to read AB8505_RTC_PCUT_CTL_STATUS_REG\n");
2825 goto fail;
2826 }
2827
2828 return scnprintf(buf, PAGE_SIZE, "%d\n", ((reg_value & 0x10) >> 4));
2829
2830 fail:
2831 return ret;
2832 }
2833
ab8505_powercut_debounce_read(struct device * dev,struct device_attribute * attr,char * buf)2834 static ssize_t ab8505_powercut_debounce_read(struct device *dev,
2835 struct device_attribute *attr,
2836 char *buf)
2837 {
2838 int ret;
2839 u8 reg_value;
2840 struct power_supply *psy = dev_get_drvdata(dev);
2841 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2842
2843 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2844 AB8505_RTC_PCUT_DEBOUNCE_REG, ®_value);
2845
2846 if (ret < 0) {
2847 dev_err(dev, "Failed to read AB8505_RTC_PCUT_DEBOUNCE_REG\n");
2848 goto fail;
2849 }
2850
2851 return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7));
2852
2853 fail:
2854 return ret;
2855 }
2856
ab8505_powercut_debounce_write(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)2857 static ssize_t ab8505_powercut_debounce_write(struct device *dev,
2858 struct device_attribute *attr,
2859 const char *buf, size_t count)
2860 {
2861 int ret;
2862 int reg_value;
2863 struct power_supply *psy = dev_get_drvdata(dev);
2864 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2865
2866 reg_value = simple_strtoul(buf, NULL, 10);
2867 if (reg_value > 0x7) {
2868 dev_err(dev, "Incorrect parameter, echo 0 to 7 for debounce setting\n");
2869 goto fail;
2870 }
2871
2872 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2873 AB8505_RTC_PCUT_DEBOUNCE_REG, (u8)reg_value);
2874
2875 if (ret < 0)
2876 dev_err(dev, "Failed to set AB8505_RTC_PCUT_DEBOUNCE_REG\n");
2877
2878 fail:
2879 return count;
2880 }
2881
ab8505_powercut_enable_status_read(struct device * dev,struct device_attribute * attr,char * buf)2882 static ssize_t ab8505_powercut_enable_status_read(struct device *dev,
2883 struct device_attribute *attr,
2884 char *buf)
2885 {
2886 int ret;
2887 u8 reg_value;
2888 struct power_supply *psy = dev_get_drvdata(dev);
2889 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2890
2891 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2892 AB8505_RTC_PCUT_CTL_STATUS_REG, ®_value);
2893
2894 if (ret < 0) {
2895 dev_err(dev, "Failed to read AB8505_RTC_PCUT_CTL_STATUS_REG\n");
2896 goto fail;
2897 }
2898
2899 return scnprintf(buf, PAGE_SIZE, "%d\n", ((reg_value & 0x20) >> 5));
2900
2901 fail:
2902 return ret;
2903 }
2904
2905 static struct device_attribute ab8505_fg_sysfs_psy_attrs[] = {
2906 __ATTR(powercut_flagtime, (S_IRUGO | S_IWUSR | S_IWGRP),
2907 ab8505_powercut_flagtime_read, ab8505_powercut_flagtime_write),
2908 __ATTR(powercut_maxtime, (S_IRUGO | S_IWUSR | S_IWGRP),
2909 ab8505_powercut_maxtime_read, ab8505_powercut_maxtime_write),
2910 __ATTR(powercut_restart_max, (S_IRUGO | S_IWUSR | S_IWGRP),
2911 ab8505_powercut_restart_read, ab8505_powercut_restart_write),
2912 __ATTR(powercut_timer, S_IRUGO, ab8505_powercut_timer_read, NULL),
2913 __ATTR(powercut_restart_counter, S_IRUGO,
2914 ab8505_powercut_restart_counter_read, NULL),
2915 __ATTR(powercut_enable, (S_IRUGO | S_IWUSR | S_IWGRP),
2916 ab8505_powercut_read, ab8505_powercut_write),
2917 __ATTR(powercut_flag, S_IRUGO, ab8505_powercut_flag_read, NULL),
2918 __ATTR(powercut_debounce_time, (S_IRUGO | S_IWUSR | S_IWGRP),
2919 ab8505_powercut_debounce_read, ab8505_powercut_debounce_write),
2920 __ATTR(powercut_enable_status, S_IRUGO,
2921 ab8505_powercut_enable_status_read, NULL),
2922 };
2923
ab8500_fg_sysfs_psy_create_attrs(struct ab8500_fg * di)2924 static int ab8500_fg_sysfs_psy_create_attrs(struct ab8500_fg *di)
2925 {
2926 unsigned int i;
2927
2928 if (((is_ab8505(di->parent) || is_ab9540(di->parent)) &&
2929 abx500_get_chip_id(di->dev) >= AB8500_CUT2P0)
2930 || is_ab8540(di->parent)) {
2931 for (i = 0; i < ARRAY_SIZE(ab8505_fg_sysfs_psy_attrs); i++)
2932 if (device_create_file(&di->fg_psy->dev,
2933 &ab8505_fg_sysfs_psy_attrs[i]))
2934 goto sysfs_psy_create_attrs_failed_ab8505;
2935 }
2936 return 0;
2937 sysfs_psy_create_attrs_failed_ab8505:
2938 dev_err(&di->fg_psy->dev, "Failed creating sysfs psy attrs for ab8505.\n");
2939 while (i--)
2940 device_remove_file(&di->fg_psy->dev,
2941 &ab8505_fg_sysfs_psy_attrs[i]);
2942
2943 return -EIO;
2944 }
2945
ab8500_fg_sysfs_psy_remove_attrs(struct ab8500_fg * di)2946 static void ab8500_fg_sysfs_psy_remove_attrs(struct ab8500_fg *di)
2947 {
2948 unsigned int i;
2949
2950 if (((is_ab8505(di->parent) || is_ab9540(di->parent)) &&
2951 abx500_get_chip_id(di->dev) >= AB8500_CUT2P0)
2952 || is_ab8540(di->parent)) {
2953 for (i = 0; i < ARRAY_SIZE(ab8505_fg_sysfs_psy_attrs); i++)
2954 (void)device_remove_file(&di->fg_psy->dev,
2955 &ab8505_fg_sysfs_psy_attrs[i]);
2956 }
2957 }
2958
2959 /* Exposure to the sysfs interface <<END>> */
2960
2961 #if defined(CONFIG_PM)
ab8500_fg_resume(struct platform_device * pdev)2962 static int ab8500_fg_resume(struct platform_device *pdev)
2963 {
2964 struct ab8500_fg *di = platform_get_drvdata(pdev);
2965
2966 /*
2967 * Change state if we're not charging. If we're charging we will wake
2968 * up on the FG IRQ
2969 */
2970 if (!di->flags.charging) {
2971 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_WAKEUP);
2972 queue_work(di->fg_wq, &di->fg_work);
2973 }
2974
2975 return 0;
2976 }
2977
ab8500_fg_suspend(struct platform_device * pdev,pm_message_t state)2978 static int ab8500_fg_suspend(struct platform_device *pdev,
2979 pm_message_t state)
2980 {
2981 struct ab8500_fg *di = platform_get_drvdata(pdev);
2982
2983 flush_delayed_work(&di->fg_periodic_work);
2984 flush_work(&di->fg_work);
2985 flush_work(&di->fg_acc_cur_work);
2986 flush_delayed_work(&di->fg_reinit_work);
2987 flush_delayed_work(&di->fg_low_bat_work);
2988 flush_delayed_work(&di->fg_check_hw_failure_work);
2989
2990 /*
2991 * If the FG is enabled we will disable it before going to suspend
2992 * only if we're not charging
2993 */
2994 if (di->flags.fg_enabled && !di->flags.charging)
2995 ab8500_fg_coulomb_counter(di, false);
2996
2997 return 0;
2998 }
2999 #else
3000 #define ab8500_fg_suspend NULL
3001 #define ab8500_fg_resume NULL
3002 #endif
3003
ab8500_fg_remove(struct platform_device * pdev)3004 static int ab8500_fg_remove(struct platform_device *pdev)
3005 {
3006 int ret = 0;
3007 struct ab8500_fg *di = platform_get_drvdata(pdev);
3008
3009 list_del(&di->node);
3010
3011 /* Disable coulomb counter */
3012 ret = ab8500_fg_coulomb_counter(di, false);
3013 if (ret)
3014 dev_err(di->dev, "failed to disable coulomb counter\n");
3015
3016 destroy_workqueue(di->fg_wq);
3017 ab8500_fg_sysfs_exit(di);
3018
3019 flush_scheduled_work();
3020 ab8500_fg_sysfs_psy_remove_attrs(di);
3021 power_supply_unregister(di->fg_psy);
3022 return ret;
3023 }
3024
3025 /* ab8500 fg driver interrupts and their respective isr */
3026 static struct ab8500_fg_interrupts ab8500_fg_irq_th[] = {
3027 {"NCONV_ACCU", ab8500_fg_cc_convend_handler},
3028 {"BATT_OVV", ab8500_fg_batt_ovv_handler},
3029 {"LOW_BAT_F", ab8500_fg_lowbatf_handler},
3030 {"CC_INT_CALIB", ab8500_fg_cc_int_calib_handler},
3031 };
3032
3033 static struct ab8500_fg_interrupts ab8500_fg_irq_bh[] = {
3034 {"CCEOC", ab8500_fg_cc_data_end_handler},
3035 };
3036
3037 static char *supply_interface[] = {
3038 "ab8500_chargalg",
3039 "ab8500_usb",
3040 };
3041
3042 static const struct power_supply_desc ab8500_fg_desc = {
3043 .name = "ab8500_fg",
3044 .type = POWER_SUPPLY_TYPE_BATTERY,
3045 .properties = ab8500_fg_props,
3046 .num_properties = ARRAY_SIZE(ab8500_fg_props),
3047 .get_property = ab8500_fg_get_property,
3048 .external_power_changed = ab8500_fg_external_power_changed,
3049 };
3050
ab8500_fg_probe(struct platform_device * pdev)3051 static int ab8500_fg_probe(struct platform_device *pdev)
3052 {
3053 struct device_node *np = pdev->dev.of_node;
3054 struct abx500_bm_data *plat = pdev->dev.platform_data;
3055 struct power_supply_config psy_cfg = {};
3056 struct ab8500_fg *di;
3057 int i, irq;
3058 int ret = 0;
3059
3060 di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
3061 if (!di) {
3062 dev_err(&pdev->dev, "%s no mem for ab8500_fg\n", __func__);
3063 return -ENOMEM;
3064 }
3065
3066 if (!plat) {
3067 dev_err(&pdev->dev, "no battery management data supplied\n");
3068 return -EINVAL;
3069 }
3070 di->bm = plat;
3071
3072 if (np) {
3073 ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
3074 if (ret) {
3075 dev_err(&pdev->dev, "failed to get battery information\n");
3076 return ret;
3077 }
3078 }
3079
3080 mutex_init(&di->cc_lock);
3081
3082 /* get parent data */
3083 di->dev = &pdev->dev;
3084 di->parent = dev_get_drvdata(pdev->dev.parent);
3085 di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
3086
3087 psy_cfg.supplied_to = supply_interface;
3088 psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
3089 psy_cfg.drv_data = di;
3090
3091 di->bat_cap.max_mah_design = MILLI_TO_MICRO *
3092 di->bm->bat_type[di->bm->batt_id].charge_full_design;
3093
3094 di->bat_cap.max_mah = di->bat_cap.max_mah_design;
3095
3096 di->vbat_nom = di->bm->bat_type[di->bm->batt_id].nominal_voltage;
3097
3098 di->init_capacity = true;
3099
3100 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
3101 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT);
3102
3103 /* Create a work queue for running the FG algorithm */
3104 di->fg_wq = create_singlethread_workqueue("ab8500_fg_wq");
3105 if (di->fg_wq == NULL) {
3106 dev_err(di->dev, "failed to create work queue\n");
3107 return -ENOMEM;
3108 }
3109
3110 /* Init work for running the fg algorithm instantly */
3111 INIT_WORK(&di->fg_work, ab8500_fg_instant_work);
3112
3113 /* Init work for getting the battery accumulated current */
3114 INIT_WORK(&di->fg_acc_cur_work, ab8500_fg_acc_cur_work);
3115
3116 /* Init work for reinitialising the fg algorithm */
3117 INIT_DEFERRABLE_WORK(&di->fg_reinit_work,
3118 ab8500_fg_reinit_work);
3119
3120 /* Work delayed Queue to run the state machine */
3121 INIT_DEFERRABLE_WORK(&di->fg_periodic_work,
3122 ab8500_fg_periodic_work);
3123
3124 /* Work to check low battery condition */
3125 INIT_DEFERRABLE_WORK(&di->fg_low_bat_work,
3126 ab8500_fg_low_bat_work);
3127
3128 /* Init work for HW failure check */
3129 INIT_DEFERRABLE_WORK(&di->fg_check_hw_failure_work,
3130 ab8500_fg_check_hw_failure_work);
3131
3132 /* Reset battery low voltage flag */
3133 di->flags.low_bat = false;
3134
3135 /* Initialize low battery counter */
3136 di->low_bat_cnt = 10;
3137
3138 /* Initialize OVV, and other registers */
3139 ret = ab8500_fg_init_hw_registers(di);
3140 if (ret) {
3141 dev_err(di->dev, "failed to initialize registers\n");
3142 goto free_inst_curr_wq;
3143 }
3144
3145 /* Consider battery unknown until we're informed otherwise */
3146 di->flags.batt_unknown = true;
3147 di->flags.batt_id_received = false;
3148
3149 /* Register FG power supply class */
3150 di->fg_psy = power_supply_register(di->dev, &ab8500_fg_desc, &psy_cfg);
3151 if (IS_ERR(di->fg_psy)) {
3152 dev_err(di->dev, "failed to register FG psy\n");
3153 ret = PTR_ERR(di->fg_psy);
3154 goto free_inst_curr_wq;
3155 }
3156
3157 di->fg_samples = SEC_TO_SAMPLE(di->bm->fg_params->init_timer);
3158 ab8500_fg_coulomb_counter(di, true);
3159
3160 /*
3161 * Initialize completion used to notify completion and start
3162 * of inst current
3163 */
3164 init_completion(&di->ab8500_fg_started);
3165 init_completion(&di->ab8500_fg_complete);
3166
3167 /* Register primary interrupt handlers */
3168 for (i = 0; i < ARRAY_SIZE(ab8500_fg_irq_th); i++) {
3169 irq = platform_get_irq_byname(pdev, ab8500_fg_irq_th[i].name);
3170 ret = request_irq(irq, ab8500_fg_irq_th[i].isr,
3171 IRQF_SHARED | IRQF_NO_SUSPEND,
3172 ab8500_fg_irq_th[i].name, di);
3173
3174 if (ret != 0) {
3175 dev_err(di->dev, "failed to request %s IRQ %d: %d\n",
3176 ab8500_fg_irq_th[i].name, irq, ret);
3177 goto free_irq;
3178 }
3179 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
3180 ab8500_fg_irq_th[i].name, irq, ret);
3181 }
3182
3183 /* Register threaded interrupt handler */
3184 irq = platform_get_irq_byname(pdev, ab8500_fg_irq_bh[0].name);
3185 ret = request_threaded_irq(irq, NULL, ab8500_fg_irq_bh[0].isr,
3186 IRQF_SHARED | IRQF_NO_SUSPEND | IRQF_ONESHOT,
3187 ab8500_fg_irq_bh[0].name, di);
3188
3189 if (ret != 0) {
3190 dev_err(di->dev, "failed to request %s IRQ %d: %d\n",
3191 ab8500_fg_irq_bh[0].name, irq, ret);
3192 goto free_irq;
3193 }
3194 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
3195 ab8500_fg_irq_bh[0].name, irq, ret);
3196
3197 di->irq = platform_get_irq_byname(pdev, "CCEOC");
3198 disable_irq(di->irq);
3199 di->nbr_cceoc_irq_cnt = 0;
3200
3201 platform_set_drvdata(pdev, di);
3202
3203 ret = ab8500_fg_sysfs_init(di);
3204 if (ret) {
3205 dev_err(di->dev, "failed to create sysfs entry\n");
3206 goto free_irq;
3207 }
3208
3209 ret = ab8500_fg_sysfs_psy_create_attrs(di);
3210 if (ret) {
3211 dev_err(di->dev, "failed to create FG psy\n");
3212 ab8500_fg_sysfs_exit(di);
3213 goto free_irq;
3214 }
3215
3216 /* Calibrate the fg first time */
3217 di->flags.calibrate = true;
3218 di->calib_state = AB8500_FG_CALIB_INIT;
3219
3220 /* Use room temp as default value until we get an update from driver. */
3221 di->bat_temp = 210;
3222
3223 /* Run the FG algorithm */
3224 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
3225
3226 list_add_tail(&di->node, &ab8500_fg_list);
3227
3228 return ret;
3229
3230 free_irq:
3231 power_supply_unregister(di->fg_psy);
3232
3233 /* We also have to free all registered irqs */
3234 for (i = 0; i < ARRAY_SIZE(ab8500_fg_irq_th); i++) {
3235 irq = platform_get_irq_byname(pdev, ab8500_fg_irq_th[i].name);
3236 free_irq(irq, di);
3237 }
3238 irq = platform_get_irq_byname(pdev, ab8500_fg_irq_bh[0].name);
3239 free_irq(irq, di);
3240 free_inst_curr_wq:
3241 destroy_workqueue(di->fg_wq);
3242 return ret;
3243 }
3244
3245 static const struct of_device_id ab8500_fg_match[] = {
3246 { .compatible = "stericsson,ab8500-fg", },
3247 { },
3248 };
3249
3250 static struct platform_driver ab8500_fg_driver = {
3251 .probe = ab8500_fg_probe,
3252 .remove = ab8500_fg_remove,
3253 .suspend = ab8500_fg_suspend,
3254 .resume = ab8500_fg_resume,
3255 .driver = {
3256 .name = "ab8500-fg",
3257 .of_match_table = ab8500_fg_match,
3258 },
3259 };
3260
ab8500_fg_init(void)3261 static int __init ab8500_fg_init(void)
3262 {
3263 return platform_driver_register(&ab8500_fg_driver);
3264 }
3265
ab8500_fg_exit(void)3266 static void __exit ab8500_fg_exit(void)
3267 {
3268 platform_driver_unregister(&ab8500_fg_driver);
3269 }
3270
3271 subsys_initcall_sync(ab8500_fg_init);
3272 module_exit(ab8500_fg_exit);
3273
3274 MODULE_LICENSE("GPL v2");
3275 MODULE_AUTHOR("Johan Palsson, Karl Komierowski");
3276 MODULE_ALIAS("platform:ab8500-fg");
3277 MODULE_DESCRIPTION("AB8500 Fuel Gauge driver");
3278