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ab8500_bm: Adds support for Car/Travel Adapters
[linux-2.6-block.git] / drivers / power / ab8500_fg.c
CommitLineData
13151631
AM		 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>
13151631 25#include <linux/slab.h>
13151631 26#include <linux/delay.h>
13151631 27#include <linux/time.h>
e0f1abeb 28#include <linux/of.h>
13151631 29#include <linux/completion.h>
e0f1abeb
R		 30#include <linux/mfd/core.h>
31#include <linux/mfd/abx500.h>
32#include <linux/mfd/abx500/ab8500.h>
33#include <linux/mfd/abx500/ab8500-bm.h>
34#include <linux/mfd/abx500/ab8500-gpadc.h>
13151631
AM		 35
36#define MILLI_TO_MICRO 1000
37#define FG_LSB_IN_MA 1627
38#define QLSB_NANO_AMP_HOURS_X10 1129
39#define INS_CURR_TIMEOUT (3 * HZ)
40
41#define SEC_TO_SAMPLE(S) (S * 4)
42
43#define NBR_AVG_SAMPLES 20
44
45#define LOW_BAT_CHECK_INTERVAL (2 * HZ)
46
47#define VALID_CAPACITY_SEC (45 * 60) /* 45 minutes */
48#define BATT_OK_MIN 2360 /* mV */
49#define BATT_OK_INCREMENT 50 /* mV */
50#define BATT_OK_MAX_NR_INCREMENTS 0xE
51
52/* FG constants */
53#define BATT_OVV 0x01
54
55#define interpolate(x, x1, y1, x2, y2) \
56 ((y1) + ((((y2) - (y1)) * ((x) - (x1))) / ((x2) - (x1))));
57
58#define to_ab8500_fg_device_info(x) container_of((x), \
59 struct ab8500_fg, fg_psy);
60
61/**
62 * struct ab8500_fg_interrupts - ab8500 fg interupts
63 * @name: name of the interrupt
64 * @isr function pointer to the isr
65 */
66struct ab8500_fg_interrupts {
67 char *name;
68 irqreturn_t (*isr)(int irq, void *data);
69};
70
71enum ab8500_fg_discharge_state {
72 AB8500_FG_DISCHARGE_INIT,
73 AB8500_FG_DISCHARGE_INITMEASURING,
74 AB8500_FG_DISCHARGE_INIT_RECOVERY,
75 AB8500_FG_DISCHARGE_RECOVERY,
76 AB8500_FG_DISCHARGE_READOUT_INIT,
77 AB8500_FG_DISCHARGE_READOUT,
78 AB8500_FG_DISCHARGE_WAKEUP,
79};
80
81static char *discharge_state[] = {
82 "DISCHARGE_INIT",
83 "DISCHARGE_INITMEASURING",
84 "DISCHARGE_INIT_RECOVERY",
85 "DISCHARGE_RECOVERY",
86 "DISCHARGE_READOUT_INIT",
87 "DISCHARGE_READOUT",
88 "DISCHARGE_WAKEUP",
89};
90
91enum ab8500_fg_charge_state {
92 AB8500_FG_CHARGE_INIT,
93 AB8500_FG_CHARGE_READOUT,
94};
95
96static char *charge_state[] = {
97 "CHARGE_INIT",
98 "CHARGE_READOUT",
99};
100
101enum ab8500_fg_calibration_state {
102 AB8500_FG_CALIB_INIT,
103 AB8500_FG_CALIB_WAIT,
104 AB8500_FG_CALIB_END,
105};
106
107struct ab8500_fg_avg_cap {
108 int avg;
109 int samples[NBR_AVG_SAMPLES];
110 __kernel_time_t time_stamps[NBR_AVG_SAMPLES];
111 int pos;
112 int nbr_samples;
113 int sum;
114};
115
ea402401
MC		 116struct ab8500_fg_cap_scaling {
117 bool enable;
118 int cap_to_scale[2];
119 int disable_cap_level;
120 int scaled_cap;
121};
122
13151631
AM		 123struct ab8500_fg_battery_capacity {
124 int max_mah_design;
125 int max_mah;
126 int mah;
127 int permille;
128 int level;
129 int prev_mah;
130 int prev_percent;
131 int prev_level;
132 int user_mah;
ea402401 133 struct ab8500_fg_cap_scaling cap_scale;
13151631
AM		 134};
135
136struct ab8500_fg_flags {
137 bool fg_enabled;
138 bool conv_done;
139 bool charging;
140 bool fully_charged;
141 bool force_full;
142 bool low_bat_delay;
143 bool low_bat;
144 bool bat_ovv;
145 bool batt_unknown;
146 bool calibrate;
147 bool user_cap;
148 bool batt_id_received;
149};
150
151struct inst_curr_result_list {
152 struct list_head list;
153 int *result;
154};
155
156/**
157 * struct ab8500_fg - ab8500 FG device information
158 * @dev: Pointer to the structure device
159 * @node: a list of AB8500 FGs, hence prepared for reentrance
160 * @irq holds the CCEOC interrupt number
161 * @vbat: Battery voltage in mV
162 * @vbat_nom: Nominal battery voltage in mV
163 * @inst_curr: Instantenous battery current in mA
164 * @avg_curr: Average battery current in mA
165 * @bat_temp battery temperature
166 * @fg_samples: Number of samples used in the FG accumulation
167 * @accu_charge: Accumulated charge from the last conversion
168 * @recovery_cnt: Counter for recovery mode
169 * @high_curr_cnt: Counter for high current mode
170 * @init_cnt: Counter for init mode
3988a4df 171 * @nbr_cceoc_irq_cnt Counter for number of CCEOC irqs received since enabled
13151631
AM		 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
3988a4df 179 * @ab8500_fg_started Completion struct used for the instant current start
13151631
AM		 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
b0284de0 186 * @bm: Platform specific battery management information
13151631
AM		 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 */
198struct 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;
3988a4df 212 int nbr_cceoc_irq_cnt;
13151631
AM		 213 bool recovery_needed;
214 bool high_curr_mode;
215 bool init_capacity;
216 bool turn_off_fg;
217 enum ab8500_fg_calibration_state calib_state;
218 enum ab8500_fg_discharge_state discharge_state;
219 enum ab8500_fg_charge_state charge_state;
3988a4df 220 struct completion ab8500_fg_started;
13151631
AM		 221 struct completion ab8500_fg_complete;
222 struct ab8500_fg_flags flags;
223 struct ab8500_fg_battery_capacity bat_cap;
224 struct ab8500_fg_avg_cap avg_cap;
225 struct ab8500 *parent;
226 struct ab8500_gpadc *gpadc;
b0284de0 227 struct abx500_bm_data *bm;
13151631
AM		 228 struct power_supply fg_psy;
229 struct workqueue_struct *fg_wq;
230 struct delayed_work fg_periodic_work;
231 struct delayed_work fg_low_bat_work;
232 struct delayed_work fg_reinit_work;
233 struct work_struct fg_work;
234 struct work_struct fg_acc_cur_work;
235 struct delayed_work fg_check_hw_failure_work;
236 struct mutex cc_lock;
237 struct kobject fg_kobject;
238};
239static LIST_HEAD(ab8500_fg_list);
240
241/**
242 * ab8500_fg_get() - returns a reference to the primary AB8500 fuel gauge
243 * (i.e. the first fuel gauge in the instance list)
244 */
245struct ab8500_fg *ab8500_fg_get(void)
246{
247 struct ab8500_fg *fg;
248
249 if (list_empty(&ab8500_fg_list))
250 return NULL;
251
252 fg = list_first_entry(&ab8500_fg_list, struct ab8500_fg, node);
253 return fg;
254}
255
256/* Main battery properties */
257static enum power_supply_property ab8500_fg_props[] = {
258 POWER_SUPPLY_PROP_VOLTAGE_NOW,
259 POWER_SUPPLY_PROP_CURRENT_NOW,
260 POWER_SUPPLY_PROP_CURRENT_AVG,
261 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
262 POWER_SUPPLY_PROP_ENERGY_FULL,
263 POWER_SUPPLY_PROP_ENERGY_NOW,
264 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
265 POWER_SUPPLY_PROP_CHARGE_FULL,
266 POWER_SUPPLY_PROP_CHARGE_NOW,
267 POWER_SUPPLY_PROP_CAPACITY,
268 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
269};
270
271/*
272 * This array maps the raw hex value to lowbat voltage used by the AB8500
273 * Values taken from the UM0836
274 */
275static int ab8500_fg_lowbat_voltage_map[] = {
276 2300 ,
277 2325 ,
278 2350 ,
279 2375 ,
280 2400 ,
281 2425 ,
282 2450 ,
283 2475 ,
284 2500 ,
285 2525 ,
286 2550 ,
287 2575 ,
288 2600 ,
289 2625 ,
290 2650 ,
291 2675 ,
292 2700 ,
293 2725 ,
294 2750 ,
295 2775 ,
296 2800 ,
297 2825 ,
298 2850 ,
299 2875 ,
300 2900 ,
301 2925 ,
302 2950 ,
303 2975 ,
304 3000 ,
305 3025 ,
306 3050 ,
307 3075 ,
308 3100 ,
309 3125 ,
310 3150 ,
311 3175 ,
312 3200 ,
313 3225 ,
314 3250 ,
315 3275 ,
316 3300 ,
317 3325 ,
318 3350 ,
319 3375 ,
320 3400 ,
321 3425 ,
322 3450 ,
323 3475 ,
324 3500 ,
325 3525 ,
326 3550 ,
327 3575 ,
328 3600 ,
329 3625 ,
330 3650 ,
331 3675 ,
332 3700 ,
333 3725 ,
334 3750 ,
335 3775 ,
336 3800 ,
337 3825 ,
338 3850 ,
339 3850 ,
340};
341
342static u8 ab8500_volt_to_regval(int voltage)
343{
344 int i;
345
346 if (voltage < ab8500_fg_lowbat_voltage_map[0])
347 return 0;
348
349 for (i = 0; i < ARRAY_SIZE(ab8500_fg_lowbat_voltage_map); i++) {
350 if (voltage < ab8500_fg_lowbat_voltage_map[i])
351 return (u8) i - 1;
352 }
353
354 /* If not captured above, return index of last element */
355 return (u8) ARRAY_SIZE(ab8500_fg_lowbat_voltage_map) - 1;
356}
357
358/**
359 * ab8500_fg_is_low_curr() - Low or high current mode
360 * @di: pointer to the ab8500_fg structure
361 * @curr: the current to base or our decision on
362 *
363 * Low current mode if the current consumption is below a certain threshold
364 */
365static int ab8500_fg_is_low_curr(struct ab8500_fg *di, int curr)
366{
367 /*
368 * We want to know if we're in low current mode
369 */
b0284de0 370 if (curr > -di->bm->fg_params->high_curr_threshold)
13151631
AM		 371 return true;
372 else
373 return false;
374}
375
376/**
377 * ab8500_fg_add_cap_sample() - Add capacity to average filter
378 * @di: pointer to the ab8500_fg structure
379 * @sample: the capacity in mAh to add to the filter
380 *
381 * A capacity is added to the filter and a new mean capacity is calculated and
382 * returned
383 */
384static int ab8500_fg_add_cap_sample(struct ab8500_fg *di, int sample)
385{
386 struct timespec ts;
387 struct ab8500_fg_avg_cap *avg = &di->avg_cap;
388
389 getnstimeofday(&ts);
390
391 do {
392 avg->sum += sample - avg->samples[avg->pos];
393 avg->samples[avg->pos] = sample;
394 avg->time_stamps[avg->pos] = ts.tv_sec;
395 avg->pos++;
396
397 if (avg->pos == NBR_AVG_SAMPLES)
398 avg->pos = 0;
399
400 if (avg->nbr_samples < NBR_AVG_SAMPLES)
401 avg->nbr_samples++;
402
403 /*
404 * Check the time stamp for each sample. If too old,
405 * replace with latest sample
406 */
407 } while (ts.tv_sec - VALID_CAPACITY_SEC > avg->time_stamps[avg->pos]);
408
409 avg->avg = avg->sum / avg->nbr_samples;
410
411 return avg->avg;
412}
413
414/**
415 * ab8500_fg_clear_cap_samples() - Clear average filter
416 * @di: pointer to the ab8500_fg structure
417 *
418 * The capacity filter is is reset to zero.
419 */
420static void ab8500_fg_clear_cap_samples(struct ab8500_fg *di)
421{
422 int i;
423 struct ab8500_fg_avg_cap *avg = &di->avg_cap;
424
425 avg->pos = 0;
426 avg->nbr_samples = 0;
427 avg->sum = 0;
428 avg->avg = 0;
429
430 for (i = 0; i < NBR_AVG_SAMPLES; i++) {
431 avg->samples[i] = 0;
432 avg->time_stamps[i] = 0;
433 }
434}
435
436/**
437 * ab8500_fg_fill_cap_sample() - Fill average filter
438 * @di: pointer to the ab8500_fg structure
439 * @sample: the capacity in mAh to fill the filter with
440 *
441 * The capacity filter is filled with a capacity in mAh
442 */
443static void ab8500_fg_fill_cap_sample(struct ab8500_fg *di, int sample)
444{
445 int i;
446 struct timespec ts;
447 struct ab8500_fg_avg_cap *avg = &di->avg_cap;
448
449 getnstimeofday(&ts);
450
451 for (i = 0; i < NBR_AVG_SAMPLES; i++) {
452 avg->samples[i] = sample;
453 avg->time_stamps[i] = ts.tv_sec;
454 }
455
456 avg->pos = 0;
457 avg->nbr_samples = NBR_AVG_SAMPLES;
458 avg->sum = sample * NBR_AVG_SAMPLES;
459 avg->avg = sample;
460}
461
462/**
463 * ab8500_fg_coulomb_counter() - enable coulomb counter
464 * @di: pointer to the ab8500_fg structure
465 * @enable: enable/disable
466 *
467 * Enable/Disable coulomb counter.
468 * On failure returns negative value.
469 */
470static int ab8500_fg_coulomb_counter(struct ab8500_fg *di, bool enable)
471{
472 int ret = 0;
473 mutex_lock(&di->cc_lock);
474 if (enable) {
475 /* To be able to reprogram the number of samples, we have to
476 * first stop the CC and then enable it again */
477 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
478 AB8500_RTC_CC_CONF_REG, 0x00);
479 if (ret)
480 goto cc_err;
481
482 /* Program the samples */
483 ret = abx500_set_register_interruptible(di->dev,
484 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU,
485 di->fg_samples);
486 if (ret)
487 goto cc_err;
488
489 /* Start the CC */
490 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
491 AB8500_RTC_CC_CONF_REG,
492 (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA));
493 if (ret)
494 goto cc_err;
495
496 di->flags.fg_enabled = true;
497 } else {
498 /* Clear any pending read requests */
e32ad07c
KK		 499 ret = abx500_mask_and_set_register_interruptible(di->dev,
500 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
501 (RESET_ACCU | READ_REQ), 0);
13151631
AM		 502 if (ret)
503 goto cc_err;
504
505 ret = abx500_set_register_interruptible(di->dev,
506 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU_CTRL, 0);
507 if (ret)
508 goto cc_err;
509
510 /* Stop the CC */
511 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
512 AB8500_RTC_CC_CONF_REG, 0);
513 if (ret)
514 goto cc_err;
515
516 di->flags.fg_enabled = false;
517
518 }
519 dev_dbg(di->dev, " CC enabled: %d Samples: %d\n",
520 enable, di->fg_samples);
521
522 mutex_unlock(&di->cc_lock);
523
524 return ret;
525cc_err:
526 dev_err(di->dev, "%s Enabling coulomb counter failed\n", __func__);
527 mutex_unlock(&di->cc_lock);
528 return ret;
529}
530
531/**
532 * ab8500_fg_inst_curr_start() - start battery instantaneous current
533 * @di: pointer to the ab8500_fg structure
534 *
535 * Returns 0 or error code
536 * Note: This is part "one" and has to be called before
537 * ab8500_fg_inst_curr_finalize()
538 */
3988a4df 539int ab8500_fg_inst_curr_start(struct ab8500_fg *di)
13151631
AM		 540{
541 u8 reg_val;
542 int ret;
543
544 mutex_lock(&di->cc_lock);
545
3988a4df 546 di->nbr_cceoc_irq_cnt = 0;
13151631
AM		 547 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
548 AB8500_RTC_CC_CONF_REG, &reg_val);
549 if (ret < 0)
550 goto fail;
551
552 if (!(reg_val & CC_PWR_UP_ENA)) {
553 dev_dbg(di->dev, "%s Enable FG\n", __func__);
554 di->turn_off_fg = true;
555
556 /* Program the samples */
557 ret = abx500_set_register_interruptible(di->dev,
558 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU,
559 SEC_TO_SAMPLE(10));
560 if (ret)
561 goto fail;
562
563 /* Start the CC */
564 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
565 AB8500_RTC_CC_CONF_REG,
566 (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA));
567 if (ret)
568 goto fail;
569 } else {
570 di->turn_off_fg = false;
571 }
572
573 /* Return and WFI */
3988a4df 574 INIT_COMPLETION(di->ab8500_fg_started);
13151631
AM		 575 INIT_COMPLETION(di->ab8500_fg_complete);
576 enable_irq(di->irq);
577
578 /* Note: cc_lock is still locked */
579 return 0;
580fail:
581 mutex_unlock(&di->cc_lock);
582 return ret;
583}
584
3988a4df
JB		 585/**
586 * ab8500_fg_inst_curr_started() - check if fg conversion has started
587 * @di: pointer to the ab8500_fg structure
588 *
589 * Returns 1 if conversion started, 0 if still waiting
590 */
591int ab8500_fg_inst_curr_started(struct ab8500_fg *di)
592{
593 return completion_done(&di->ab8500_fg_started);
594}
595
13151631
AM		 596/**
597 * ab8500_fg_inst_curr_done() - check if fg conversion is done
598 * @di: pointer to the ab8500_fg structure
599 *
600 * Returns 1 if conversion done, 0 if still waiting
601 */
602int ab8500_fg_inst_curr_done(struct ab8500_fg *di)
603{
604 return completion_done(&di->ab8500_fg_complete);
605}
606
607/**
608 * ab8500_fg_inst_curr_finalize() - battery instantaneous current
609 * @di: pointer to the ab8500_fg structure
610 * @res: battery instantenous current(on success)
611 *
612 * Returns 0 or an error code
613 * Note: This is part "two" and has to be called at earliest 250 ms
614 * after ab8500_fg_inst_curr_start()
615 */
616int ab8500_fg_inst_curr_finalize(struct ab8500_fg *di, int *res)
617{
618 u8 low, high;
619 int val;
620 int ret;
621 int timeout;
622
623 if (!completion_done(&di->ab8500_fg_complete)) {
3988a4df
JB		 624 timeout = wait_for_completion_timeout(
625 &di->ab8500_fg_complete,
13151631
AM		 626 INS_CURR_TIMEOUT);
627 dev_dbg(di->dev, "Finalize time: %d ms\n",
628 ((INS_CURR_TIMEOUT - timeout) * 1000) / HZ);
629 if (!timeout) {
630 ret = -ETIME;
631 disable_irq(di->irq);
3988a4df 632 di->nbr_cceoc_irq_cnt = 0;
13151631
AM		 633 dev_err(di->dev, "completion timed out [%d]\n",
634 __LINE__);
635 goto fail;
636 }
637 }
638
639 disable_irq(di->irq);
3988a4df 640 di->nbr_cceoc_irq_cnt = 0;
13151631
AM		 641
642 ret = abx500_mask_and_set_register_interruptible(di->dev,
643 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
644 READ_REQ, READ_REQ);
645
646 /* 100uS between read request and read is needed */
647 usleep_range(100, 100);
648
649 /* Read CC Sample conversion value Low and high */
650 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
651 AB8500_GASG_CC_SMPL_CNVL_REG, &low);
652 if (ret < 0)
653 goto fail;
654
655 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
656 AB8500_GASG_CC_SMPL_CNVH_REG, &high);
657 if (ret < 0)
658 goto fail;
659
660 /*
661 * negative value for Discharging
662 * convert 2's compliment into decimal
663 */
664 if (high & 0x10)
665 val = (low | (high << 8) | 0xFFFFE000);
666 else
667 val = (low | (high << 8));
668
669 /*
670 * Convert to unit value in mA
671 * Full scale input voltage is
672 * 66.660mV => LSB = 66.660mV/(4096*res) = 1.627mA
673 * Given a 250ms conversion cycle time the LSB corresponds
674 * to 112.9 nAh. Convert to current by dividing by the conversion
675 * time in hours (250ms = 1 / (3600 * 4)h)
676 * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm
677 */
678 val = (val * QLSB_NANO_AMP_HOURS_X10 * 36 * 4) /
b0284de0 679 (1000 * di->bm->fg_res);
13151631
AM		 680
681 if (di->turn_off_fg) {
682 dev_dbg(di->dev, "%s Disable FG\n", __func__);
683
684 /* Clear any pending read requests */
685 ret = abx500_set_register_interruptible(di->dev,
686 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 0);
687 if (ret)
688 goto fail;
689
690 /* Stop the CC */
691 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
692 AB8500_RTC_CC_CONF_REG, 0);
693 if (ret)
694 goto fail;
695 }
696 mutex_unlock(&di->cc_lock);
697 (*res) = val;
698
699 return 0;
700fail:
701 mutex_unlock(&di->cc_lock);
702 return ret;
703}
704
705/**
706 * ab8500_fg_inst_curr_blocking() - battery instantaneous current
707 * @di: pointer to the ab8500_fg structure
708 * @res: battery instantenous current(on success)
709 *
710 * Returns 0 else error code
711 */
712int ab8500_fg_inst_curr_blocking(struct ab8500_fg *di)
713{
714 int ret;
3988a4df 715 int timeout;
13151631
AM		 716 int res = 0;
717
718 ret = ab8500_fg_inst_curr_start(di);
719 if (ret) {
720 dev_err(di->dev, "Failed to initialize fg_inst\n");
721 return 0;
722 }
723
3988a4df
JB		 724 /* Wait for CC to actually start */
725 if (!completion_done(&di->ab8500_fg_started)) {
726 timeout = wait_for_completion_timeout(
727 &di->ab8500_fg_started,
728 INS_CURR_TIMEOUT);
729 dev_dbg(di->dev, "Start time: %d ms\n",
730 ((INS_CURR_TIMEOUT - timeout) * 1000) / HZ);
731 if (!timeout) {
732 ret = -ETIME;
733 dev_err(di->dev, "completion timed out [%d]\n",
734 __LINE__);
735 goto fail;
736 }
737 }
738
13151631
AM		 739 ret = ab8500_fg_inst_curr_finalize(di, &res);
740 if (ret) {
741 dev_err(di->dev, "Failed to finalize fg_inst\n");
742 return 0;
743 }
744
3988a4df 745 dev_dbg(di->dev, "%s instant current: %d", __func__, res);
13151631 746 return res;
3988a4df 747fail:
129d583b 748 disable_irq(di->irq);
3988a4df
JB		 749 mutex_unlock(&di->cc_lock);
750 return ret;
13151631
AM		 751}
752
753/**
754 * ab8500_fg_acc_cur_work() - average battery current
755 * @work: pointer to the work_struct structure
756 *
757 * Updated the average battery current obtained from the
758 * coulomb counter.
759 */
760static void ab8500_fg_acc_cur_work(struct work_struct *work)
761{
762 int val;
763 int ret;
764 u8 low, med, high;
765
766 struct ab8500_fg *di = container_of(work,
767 struct ab8500_fg, fg_acc_cur_work);
768
769 mutex_lock(&di->cc_lock);
770 ret = abx500_set_register_interruptible(di->dev, AB8500_GAS_GAUGE,
771 AB8500_GASG_CC_NCOV_ACCU_CTRL, RD_NCONV_ACCU_REQ);
772 if (ret)
773 goto exit;
774
775 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
776 AB8500_GASG_CC_NCOV_ACCU_LOW, &low);
777 if (ret < 0)
778 goto exit;
779
780 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
781 AB8500_GASG_CC_NCOV_ACCU_MED, &med);
782 if (ret < 0)
783 goto exit;
784
785 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
786 AB8500_GASG_CC_NCOV_ACCU_HIGH, &high);
787 if (ret < 0)
788 goto exit;
789
790 /* Check for sign bit in case of negative value, 2's compliment */
791 if (high & 0x10)
792 val = (low | (med << 8) | (high << 16) | 0xFFE00000);
793 else
794 val = (low | (med << 8) | (high << 16));
795
796 /*
797 * Convert to uAh
798 * Given a 250ms conversion cycle time the LSB corresponds
799 * to 112.9 nAh.
800 * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm
801 */
802 di->accu_charge = (val * QLSB_NANO_AMP_HOURS_X10) /
b0284de0 803 (100 * di->bm->fg_res);
13151631
AM		 804
805 /*
806 * Convert to unit value in mA
807 * Full scale input voltage is
808 * 66.660mV => LSB = 66.660mV/(4096*res) = 1.627mA
809 * Given a 250ms conversion cycle time the LSB corresponds
810 * to 112.9 nAh. Convert to current by dividing by the conversion
811 * time in hours (= samples / (3600 * 4)h)
812 * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm
813 */
814 di->avg_curr = (val * QLSB_NANO_AMP_HOURS_X10 * 36) /
b0284de0 815 (1000 * di->bm->fg_res * (di->fg_samples / 4));
13151631
AM		 816
817 di->flags.conv_done = true;
818
819 mutex_unlock(&di->cc_lock);
820
821 queue_work(di->fg_wq, &di->fg_work);
822
823 return;
824exit:
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 */
837static 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 */
861static int ab8500_fg_volt_to_capacity(struct ab8500_fg *di, int voltage)
862{
863 int i, tbl_size;
450ceb2b 864 struct abx500_v_to_cap *tbl;
13151631
AM		 865 int cap = 0;
866
b0284de0
LJ		 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;
13151631
AM		 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 */
900static 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 */
913static int ab8500_fg_battery_resistance(struct ab8500_fg *di)
914{
915 int i, tbl_size;
916 struct batres_vs_temp *tbl;
917 int resist = 0;
918
b0284de0
LJ		 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;
13151631
AM		 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",
b0284de0
LJ		 941 __func__, di->bat_temp, resist, di->bm->fg_res / 10,
942 (di->bm->fg_res / 10) + resist);
13151631
AM		 943
944 /* fg_res variable is in 0.1mOhm */
b0284de0 945 resist += di->bm->fg_res / 10;
13151631
AM		 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 */
957static 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++;
9a0bd070 968 usleep_range(5000, 6000);
13151631
AM		 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 */
993static 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 */
1005static 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 */
1017static 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 */
1039static 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 */
1080static 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 */
1106static 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 */
1157static int ab8500_fg_capacity_level(struct ab8500_fg *di)
1158{
1159 int ret, percent;
1160
1161 percent = di->bat_cap.permille / 10;
1162
b0284de0 1163 if (percent <= di->bm->cap_levels->critical ||
13151631
AM		 1164 di->flags.low_bat)
1165 ret = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
b0284de0 1166 else if (percent <= di->bm->cap_levels->low)
13151631 1167 ret = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
b0284de0 1168 else if (percent <= di->bm->cap_levels->normal)
13151631 1169 ret = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
b0284de0 1170 else if (percent <= di->bm->cap_levels->high)
13151631
AM		 1171 ret = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
1172 else
1173 ret = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
1174
1175 return ret;
1176}
1177
ea402401
MC		 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 */
1186static 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 */
1244static 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
13151631
AM		 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 */
1279static void ab8500_fg_check_capacity_limits(struct ab8500_fg *di, bool init)
1280{
1281 bool changed = false;
1282
1283 di->bat_cap.level = ab8500_fg_capacity_level(di);
1284
1285 if (di->bat_cap.level != di->bat_cap.prev_level) {
1286 /*
1287 * We do not allow reported capacity level to go up
1288 * unless we're charging or if we're in init
1289 */
1290 if (!(!di->flags.charging && di->bat_cap.level >
1291 di->bat_cap.prev_level) || init) {
1292 dev_dbg(di->dev, "level changed from %d to %d\n",
1293 di->bat_cap.prev_level,
1294 di->bat_cap.level);
1295 di->bat_cap.prev_level = di->bat_cap.level;
1296 changed = true;
1297 } else {
1298 dev_dbg(di->dev, "level not allowed to go up "
1299 "since no charger is connected: %d to %d\n",
1300 di->bat_cap.prev_level,
1301 di->bat_cap.level);
1302 }
1303 }
1304
1305 /*
1306 * If we have received the LOW_BAT IRQ, set capacity to 0 to initiate
1307 * shutdown
1308 */
1309 if (di->flags.low_bat) {
1310 dev_dbg(di->dev, "Battery low, set capacity to 0\n");
1311 di->bat_cap.prev_percent = 0;
1312 di->bat_cap.permille = 0;
1313 di->bat_cap.prev_mah = 0;
1314 di->bat_cap.mah = 0;
1315 changed = true;
1316 } else if (di->flags.fully_charged) {
1317 /*
1318 * We report 100% if algorithm reported fully charged
ea402401 1319 * and show 100% during maintenance charging (scaling).
13151631
AM		 1320 */
1321 if (di->flags.force_full) {
1322 di->bat_cap.prev_percent = di->bat_cap.permille / 10;
1323 di->bat_cap.prev_mah = di->bat_cap.mah;
ea402401
MC		 1324
1325 changed = true;
1326
1327 if (!di->bat_cap.cap_scale.enable &&
1328 di->bm->capacity_scaling) {
1329 di->bat_cap.cap_scale.enable = true;
1330 di->bat_cap.cap_scale.cap_to_scale[0] = 100;
1331 di->bat_cap.cap_scale.cap_to_scale[1] =
1332 di->bat_cap.prev_percent;
1333 di->bat_cap.cap_scale.disable_cap_level = 100;
1334 }
1335 } else if ( di->bat_cap.prev_percent !=
1336 (di->bat_cap.permille) / 10) {
13151631
AM		 1337 dev_dbg(di->dev,
1338 "battery reported full "
1339 "but capacity dropping: %d\n",
1340 di->bat_cap.permille / 10);
1341 di->bat_cap.prev_percent = di->bat_cap.permille / 10;
1342 di->bat_cap.prev_mah = di->bat_cap.mah;
1343
1344 changed = true;
1345 }
1346 } else if (di->bat_cap.prev_percent != di->bat_cap.permille / 10) {
1347 if (di->bat_cap.permille / 10 == 0) {
1348 /*
1349 * We will not report 0% unless we've got
1350 * the LOW_BAT IRQ, no matter what the FG
1351 * algorithm says.
1352 */
1353 di->bat_cap.prev_percent = 1;
1354 di->bat_cap.permille = 1;
1355 di->bat_cap.prev_mah = 1;
1356 di->bat_cap.mah = 1;
1357
1358 changed = true;
1359 } else if (!(!di->flags.charging &&
1360 (di->bat_cap.permille / 10) >
1361 di->bat_cap.prev_percent) || init) {
1362 /*
1363 * We do not allow reported capacity to go up
1364 * unless we're charging or if we're in init
1365 */
1366 dev_dbg(di->dev,
1367 "capacity changed from %d to %d (%d)\n",
1368 di->bat_cap.prev_percent,
1369 di->bat_cap.permille / 10,
1370 di->bat_cap.permille);
1371 di->bat_cap.prev_percent = di->bat_cap.permille / 10;
1372 di->bat_cap.prev_mah = di->bat_cap.mah;
1373
1374 changed = true;
1375 } else {
1376 dev_dbg(di->dev, "capacity not allowed to go up since "
1377 "no charger is connected: %d to %d (%d)\n",
1378 di->bat_cap.prev_percent,
1379 di->bat_cap.permille / 10,
1380 di->bat_cap.permille);
1381 }
1382 }
1383
1384 if (changed) {
ea402401
MC		 1385 if (di->bm->capacity_scaling) {
1386 di->bat_cap.cap_scale.scaled_cap =
1387 ab8500_fg_calculate_scaled_capacity(di);
1388
1389 dev_info(di->dev, "capacity=%d (%d)\n",
1390 di->bat_cap.prev_percent,
1391 di->bat_cap.cap_scale.scaled_cap);
1392 }
13151631
AM		 1393 power_supply_changed(&di->fg_psy);
1394 if (di->flags.fully_charged && di->flags.force_full) {
1395 dev_dbg(di->dev, "Battery full, notifying.\n");
1396 di->flags.force_full = false;
1397 sysfs_notify(&di->fg_kobject, NULL, "charge_full");
1398 }
1399 sysfs_notify(&di->fg_kobject, NULL, "charge_now");
1400 }
1401}
1402
1403static void ab8500_fg_charge_state_to(struct ab8500_fg *di,
1404 enum ab8500_fg_charge_state new_state)
1405{
1406 dev_dbg(di->dev, "Charge state from %d [%s] to %d [%s]\n",
1407 di->charge_state,
1408 charge_state[di->charge_state],
1409 new_state,
1410 charge_state[new_state]);
1411
1412 di->charge_state = new_state;
1413}
1414
1415static void ab8500_fg_discharge_state_to(struct ab8500_fg *di,
0fff22ee 1416 enum ab8500_fg_discharge_state new_state)
13151631
AM		 1417{
1418 dev_dbg(di->dev, "Disharge state from %d [%s] to %d [%s]\n",
1419 di->discharge_state,
1420 discharge_state[di->discharge_state],
1421 new_state,
1422 discharge_state[new_state]);
1423
1424 di->discharge_state = new_state;
1425}
1426
1427/**
1428 * ab8500_fg_algorithm_charging() - FG algorithm for when charging
1429 * @di: pointer to the ab8500_fg structure
1430 *
1431 * Battery capacity calculation state machine for when we're charging
1432 */
1433static void ab8500_fg_algorithm_charging(struct ab8500_fg *di)
1434{
1435 /*
1436 * If we change to discharge mode
1437 * we should start with recovery
1438 */
1439 if (di->discharge_state != AB8500_FG_DISCHARGE_INIT_RECOVERY)
1440 ab8500_fg_discharge_state_to(di,
1441 AB8500_FG_DISCHARGE_INIT_RECOVERY);
1442
1443 switch (di->charge_state) {
1444 case AB8500_FG_CHARGE_INIT:
1445 di->fg_samples = SEC_TO_SAMPLE(
b0284de0 1446 di->bm->fg_params->accu_charging);
13151631
AM		 1447
1448 ab8500_fg_coulomb_counter(di, true);
1449 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_READOUT);
1450
1451 break;
1452
1453 case AB8500_FG_CHARGE_READOUT:
1454 /*
1455 * Read the FG and calculate the new capacity
1456 */
1457 mutex_lock(&di->cc_lock);
ea402401 1458 if (!di->flags.conv_done && !di->flags.force_full) {
13151631
AM		 1459 /* Wasn't the CC IRQ that got us here */
1460 mutex_unlock(&di->cc_lock);
1461 dev_dbg(di->dev, "%s CC conv not done\n",
1462 __func__);
1463
1464 break;
1465 }
1466 di->flags.conv_done = false;
1467 mutex_unlock(&di->cc_lock);
1468
1469 ab8500_fg_calc_cap_charging(di);
1470
1471 break;
1472
1473 default:
1474 break;
1475 }
1476
1477 /* Check capacity limits */
1478 ab8500_fg_check_capacity_limits(di, false);
1479}
1480
1481static void force_capacity(struct ab8500_fg *di)
1482{
1483 int cap;
1484
1485 ab8500_fg_clear_cap_samples(di);
1486 cap = di->bat_cap.user_mah;
1487 if (cap > di->bat_cap.max_mah_design) {
1488 dev_dbg(di->dev, "Remaining cap %d can't be bigger than total"
1489 " %d\n", cap, di->bat_cap.max_mah_design);
1490 cap = di->bat_cap.max_mah_design;
1491 }
1492 ab8500_fg_fill_cap_sample(di, di->bat_cap.user_mah);
1493 di->bat_cap.permille = ab8500_fg_convert_mah_to_permille(di, cap);
1494 di->bat_cap.mah = cap;
1495 ab8500_fg_check_capacity_limits(di, true);
1496}
1497
1498static bool check_sysfs_capacity(struct ab8500_fg *di)
1499{
1500 int cap, lower, upper;
1501 int cap_permille;
1502
1503 cap = di->bat_cap.user_mah;
1504
1505 cap_permille = ab8500_fg_convert_mah_to_permille(di,
1506 di->bat_cap.user_mah);
1507
b0284de0
LJ		 1508 lower = di->bat_cap.permille - di->bm->fg_params->user_cap_limit * 10;
1509 upper = di->bat_cap.permille + di->bm->fg_params->user_cap_limit * 10;
13151631
AM		 1510
1511 if (lower < 0)
1512 lower = 0;
1513 /* 1000 is permille, -> 100 percent */
1514 if (upper > 1000)
1515 upper = 1000;
1516
1517 dev_dbg(di->dev, "Capacity limits:"
1518 " (Lower: %d User: %d Upper: %d) [user: %d, was: %d]\n",
1519 lower, cap_permille, upper, cap, di->bat_cap.mah);
1520
1521 /* If within limits, use the saved capacity and exit estimation...*/
1522 if (cap_permille > lower && cap_permille < upper) {
1523 dev_dbg(di->dev, "OK! Using users cap %d uAh now\n", cap);
1524 force_capacity(di);
1525 return true;
1526 }
1527 dev_dbg(di->dev, "Capacity from user out of limits, ignoring");
1528 return false;
1529}
1530
1531/**
1532 * ab8500_fg_algorithm_discharging() - FG algorithm for when discharging
1533 * @di: pointer to the ab8500_fg structure
1534 *
1535 * Battery capacity calculation state machine for when we're discharging
1536 */
1537static void ab8500_fg_algorithm_discharging(struct ab8500_fg *di)
1538{
1539 int sleep_time;
1540
1541 /* If we change to charge mode we should start with init */
1542 if (di->charge_state != AB8500_FG_CHARGE_INIT)
1543 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
1544
1545 switch (di->discharge_state) {
1546 case AB8500_FG_DISCHARGE_INIT:
1547 /* We use the FG IRQ to work on */
1548 di->init_cnt = 0;
b0284de0 1549 di->fg_samples = SEC_TO_SAMPLE(di->bm->fg_params->init_timer);
13151631
AM		 1550 ab8500_fg_coulomb_counter(di, true);
1551 ab8500_fg_discharge_state_to(di,
1552 AB8500_FG_DISCHARGE_INITMEASURING);
1553
1554 /* Intentional fallthrough */
1555 case AB8500_FG_DISCHARGE_INITMEASURING:
1556 /*
1557 * Discard a number of samples during startup.
1558 * After that, use compensated voltage for a few
1559 * samples to get an initial capacity.
1560 * Then go to READOUT
1561 */
b0284de0 1562 sleep_time = di->bm->fg_params->init_timer;
13151631
AM		 1563
1564 /* Discard the first [x] seconds */
b0284de0 1565 if (di->init_cnt > di->bm->fg_params->init_discard_time) {
13151631
AM		 1566 ab8500_fg_calc_cap_discharge_voltage(di, true);
1567
1568 ab8500_fg_check_capacity_limits(di, true);
1569 }
1570
1571 di->init_cnt += sleep_time;
b0284de0 1572 if (di->init_cnt > di->bm->fg_params->init_total_time)
13151631
AM		 1573 ab8500_fg_discharge_state_to(di,
1574 AB8500_FG_DISCHARGE_READOUT_INIT);
1575
1576 break;
1577
1578 case AB8500_FG_DISCHARGE_INIT_RECOVERY:
1579 di->recovery_cnt = 0;
1580 di->recovery_needed = true;
1581 ab8500_fg_discharge_state_to(di,
1582 AB8500_FG_DISCHARGE_RECOVERY);
1583
1584 /* Intentional fallthrough */
1585
1586 case AB8500_FG_DISCHARGE_RECOVERY:
b0284de0 1587 sleep_time = di->bm->fg_params->recovery_sleep_timer;
13151631
AM		 1588
1589 /*
1590 * We should check the power consumption
1591 * If low, go to READOUT (after x min) or
1592 * RECOVERY_SLEEP if time left.
1593 * If high, go to READOUT
1594 */
1595 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1596
1597 if (ab8500_fg_is_low_curr(di, di->inst_curr)) {
1598 if (di->recovery_cnt >
b0284de0 1599 di->bm->fg_params->recovery_total_time) {
13151631 1600 di->fg_samples = SEC_TO_SAMPLE(
b0284de0 1601 di->bm->fg_params->accu_high_curr);
13151631
AM		 1602 ab8500_fg_coulomb_counter(di, true);
1603 ab8500_fg_discharge_state_to(di,
1604 AB8500_FG_DISCHARGE_READOUT);
1605 di->recovery_needed = false;
1606 } else {
1607 queue_delayed_work(di->fg_wq,
1608 &di->fg_periodic_work,
1609 sleep_time * HZ);
1610 }
1611 di->recovery_cnt += sleep_time;
1612 } else {
1613 di->fg_samples = SEC_TO_SAMPLE(
b0284de0 1614 di->bm->fg_params->accu_high_curr);
13151631
AM		 1615 ab8500_fg_coulomb_counter(di, true);
1616 ab8500_fg_discharge_state_to(di,
1617 AB8500_FG_DISCHARGE_READOUT);
1618 }
1619 break;
1620
1621 case AB8500_FG_DISCHARGE_READOUT_INIT:
1622 di->fg_samples = SEC_TO_SAMPLE(
b0284de0 1623 di->bm->fg_params->accu_high_curr);
13151631
AM		 1624 ab8500_fg_coulomb_counter(di, true);
1625 ab8500_fg_discharge_state_to(di,
1626 AB8500_FG_DISCHARGE_READOUT);
1627 break;
1628
1629 case AB8500_FG_DISCHARGE_READOUT:
1630 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1631
1632 if (ab8500_fg_is_low_curr(di, di->inst_curr)) {
1633 /* Detect mode change */
1634 if (di->high_curr_mode) {
1635 di->high_curr_mode = false;
1636 di->high_curr_cnt = 0;
1637 }
1638
1639 if (di->recovery_needed) {
1640 ab8500_fg_discharge_state_to(di,
1641 AB8500_FG_DISCHARGE_RECOVERY);
1642
1643 queue_delayed_work(di->fg_wq,
1644 &di->fg_periodic_work, 0);
1645
1646 break;
1647 }
1648
1649 ab8500_fg_calc_cap_discharge_voltage(di, true);
1650 } else {
1651 mutex_lock(&di->cc_lock);
1652 if (!di->flags.conv_done) {
1653 /* Wasn't the CC IRQ that got us here */
1654 mutex_unlock(&di->cc_lock);
1655 dev_dbg(di->dev, "%s CC conv not done\n",
1656 __func__);
1657
1658 break;
1659 }
1660 di->flags.conv_done = false;
1661 mutex_unlock(&di->cc_lock);
1662
1663 /* Detect mode change */
1664 if (!di->high_curr_mode) {
1665 di->high_curr_mode = true;
1666 di->high_curr_cnt = 0;
1667 }
1668
1669 di->high_curr_cnt +=
b0284de0 1670 di->bm->fg_params->accu_high_curr;
13151631 1671 if (di->high_curr_cnt >
b0284de0 1672 di->bm->fg_params->high_curr_time)
13151631
AM		 1673 di->recovery_needed = true;
1674
1675 ab8500_fg_calc_cap_discharge_fg(di);
1676 }
1677
1678 ab8500_fg_check_capacity_limits(di, false);
1679
1680 break;
1681
1682 case AB8500_FG_DISCHARGE_WAKEUP:
1683 ab8500_fg_coulomb_counter(di, true);
13151631
AM		 1684 ab8500_fg_calc_cap_discharge_voltage(di, true);
1685
1686 di->fg_samples = SEC_TO_SAMPLE(
b0284de0 1687 di->bm->fg_params->accu_high_curr);
13151631
AM		 1688 ab8500_fg_coulomb_counter(di, true);
1689 ab8500_fg_discharge_state_to(di,
1690 AB8500_FG_DISCHARGE_READOUT);
1691
1692 ab8500_fg_check_capacity_limits(di, false);
1693
1694 break;
1695
1696 default:
1697 break;
1698 }
1699}
1700
1701/**
1702 * ab8500_fg_algorithm_calibrate() - Internal columb counter offset calibration
1703 * @di: pointer to the ab8500_fg structure
1704 *
1705 */
1706static void ab8500_fg_algorithm_calibrate(struct ab8500_fg *di)
1707{
1708 int ret;
1709
1710 switch (di->calib_state) {
1711 case AB8500_FG_CALIB_INIT:
1712 dev_dbg(di->dev, "Calibration ongoing...\n");
1713
1714 ret = abx500_mask_and_set_register_interruptible(di->dev,
1715 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1716 CC_INT_CAL_N_AVG_MASK, CC_INT_CAL_SAMPLES_8);
1717 if (ret < 0)
1718 goto err;
1719
1720 ret = abx500_mask_and_set_register_interruptible(di->dev,
1721 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1722 CC_INTAVGOFFSET_ENA, CC_INTAVGOFFSET_ENA);
1723 if (ret < 0)
1724 goto err;
1725 di->calib_state = AB8500_FG_CALIB_WAIT;
1726 break;
1727 case AB8500_FG_CALIB_END:
1728 ret = abx500_mask_and_set_register_interruptible(di->dev,
1729 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1730 CC_MUXOFFSET, CC_MUXOFFSET);
1731 if (ret < 0)
1732 goto err;
1733 di->flags.calibrate = false;
1734 dev_dbg(di->dev, "Calibration done...\n");
1735 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1736 break;
1737 case AB8500_FG_CALIB_WAIT:
1738 dev_dbg(di->dev, "Calibration WFI\n");
1739 default:
1740 break;
1741 }
1742 return;
1743err:
1744 /* Something went wrong, don't calibrate then */
1745 dev_err(di->dev, "failed to calibrate the CC\n");
1746 di->flags.calibrate = false;
1747 di->calib_state = AB8500_FG_CALIB_INIT;
1748 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1749}
1750
1751/**
1752 * ab8500_fg_algorithm() - Entry point for the FG algorithm
1753 * @di: pointer to the ab8500_fg structure
1754 *
1755 * Entry point for the battery capacity calculation state machine
1756 */
1757static void ab8500_fg_algorithm(struct ab8500_fg *di)
1758{
1759 if (di->flags.calibrate)
1760 ab8500_fg_algorithm_calibrate(di);
1761 else {
1762 if (di->flags.charging)
1763 ab8500_fg_algorithm_charging(di);
1764 else
1765 ab8500_fg_algorithm_discharging(di);
1766 }
1767
1768 dev_dbg(di->dev, "[FG_DATA] %d %d %d %d %d %d %d %d %d "
1769 "%d %d %d %d %d %d %d\n",
1770 di->bat_cap.max_mah_design,
1771 di->bat_cap.mah,
1772 di->bat_cap.permille,
1773 di->bat_cap.level,
1774 di->bat_cap.prev_mah,
1775 di->bat_cap.prev_percent,
1776 di->bat_cap.prev_level,
1777 di->vbat,
1778 di->inst_curr,
1779 di->avg_curr,
1780 di->accu_charge,
1781 di->flags.charging,
1782 di->charge_state,
1783 di->discharge_state,
1784 di->high_curr_mode,
1785 di->recovery_needed);
1786}
1787
1788/**
1789 * ab8500_fg_periodic_work() - Run the FG state machine periodically
1790 * @work: pointer to the work_struct structure
1791 *
1792 * Work queue function for periodic work
1793 */
1794static void ab8500_fg_periodic_work(struct work_struct *work)
1795{
1796 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1797 fg_periodic_work.work);
1798
1799 if (di->init_capacity) {
13151631
AM		 1800 /* Get an initial capacity calculation */
1801 ab8500_fg_calc_cap_discharge_voltage(di, true);
1802 ab8500_fg_check_capacity_limits(di, true);
1803 di->init_capacity = false;
1804
1805 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1806 } else if (di->flags.user_cap) {
1807 if (check_sysfs_capacity(di)) {
1808 ab8500_fg_check_capacity_limits(di, true);
1809 if (di->flags.charging)
1810 ab8500_fg_charge_state_to(di,
1811 AB8500_FG_CHARGE_INIT);
1812 else
1813 ab8500_fg_discharge_state_to(di,
1814 AB8500_FG_DISCHARGE_READOUT_INIT);
1815 }
1816 di->flags.user_cap = false;
1817 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1818 } else
1819 ab8500_fg_algorithm(di);
1820
1821}
1822
1823/**
1824 * ab8500_fg_check_hw_failure_work() - Check OVV_BAT condition
1825 * @work: pointer to the work_struct structure
1826 *
1827 * Work queue function for checking the OVV_BAT condition
1828 */
1829static void ab8500_fg_check_hw_failure_work(struct work_struct *work)
1830{
1831 int ret;
1832 u8 reg_value;
1833
1834 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1835 fg_check_hw_failure_work.work);
1836
1837 /*
1838 * If we have had a battery over-voltage situation,
1839 * check ovv-bit to see if it should be reset.
1840 */
1841 if (di->flags.bat_ovv) {
1842 ret = abx500_get_register_interruptible(di->dev,
1843 AB8500_CHARGER, AB8500_CH_STAT_REG,
1844 &reg_value);
1845 if (ret < 0) {
1846 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1847 return;
1848 }
1849 if ((reg_value & BATT_OVV) != BATT_OVV) {
1850 dev_dbg(di->dev, "Battery recovered from OVV\n");
1851 di->flags.bat_ovv = false;
1852 power_supply_changed(&di->fg_psy);
1853 return;
1854 }
1855
1856 /* Not yet recovered from ovv, reschedule this test */
1857 queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work,
1858 round_jiffies(HZ));
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 */
1868static 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 */
b0284de0 1878 if (vbat < di->bm->fg_params->lowbat_threshold) {
13151631
AM		 1879 di->flags.low_bat = true;
1880 dev_warn(di->dev, "Battery voltage still LOW\n");
1881
1882 /*
1883 * We need to re-schedule this check to be able to detect
1884 * if the voltage increases again during charging
1885 */
1886 queue_delayed_work(di->fg_wq, &di->fg_low_bat_work,
1887 round_jiffies(LOW_BAT_CHECK_INTERVAL));
1888 } else {
1889 di->flags.low_bat = false;
1890 dev_warn(di->dev, "Battery voltage OK again\n");
1891 }
1892
1893 /* This is needed to dispatch LOW_BAT */
1894 ab8500_fg_check_capacity_limits(di, false);
1895
1896 /* Set this flag to check if LOW_BAT IRQ still occurs */
1897 di->flags.low_bat_delay = false;
1898}
1899
1900/**
1901 * ab8500_fg_battok_calc - calculate the bit pattern corresponding
1902 * to the target voltage.
1903 * @di: pointer to the ab8500_fg structure
1904 * @target target voltage
1905 *
1906 * Returns bit pattern closest to the target voltage
1907 * valid return values are 0-14. (0-BATT_OK_MAX_NR_INCREMENTS)
1908 */
1909
1910static int ab8500_fg_battok_calc(struct ab8500_fg *di, int target)
1911{
1912 if (target > BATT_OK_MIN +
1913 (BATT_OK_INCREMENT * BATT_OK_MAX_NR_INCREMENTS))
1914 return BATT_OK_MAX_NR_INCREMENTS;
1915 if (target < BATT_OK_MIN)
1916 return 0;
1917 return (target - BATT_OK_MIN) / BATT_OK_INCREMENT;
1918}
1919
1920/**
1921 * ab8500_fg_battok_init_hw_register - init battok levels
1922 * @di: pointer to the ab8500_fg structure
1923 *
1924 */
1925
1926static int ab8500_fg_battok_init_hw_register(struct ab8500_fg *di)
1927{
1928 int selected;
1929 int sel0;
1930 int sel1;
1931 int cbp_sel0;
1932 int cbp_sel1;
1933 int ret;
1934 int new_val;
1935
b0284de0
LJ		 1936 sel0 = di->bm->fg_params->battok_falling_th_sel0;
1937 sel1 = di->bm->fg_params->battok_raising_th_sel1;
13151631
AM		 1938
1939 cbp_sel0 = ab8500_fg_battok_calc(di, sel0);
1940 cbp_sel1 = ab8500_fg_battok_calc(di, sel1);
1941
1942 selected = BATT_OK_MIN + cbp_sel0 * BATT_OK_INCREMENT;
1943
1944 if (selected != sel0)
1945 dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n",
1946 sel0, selected, cbp_sel0);
1947
1948 selected = BATT_OK_MIN + cbp_sel1 * BATT_OK_INCREMENT;
1949
1950 if (selected != sel1)
1951 dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n",
1952 sel1, selected, cbp_sel1);
1953
1954 new_val = cbp_sel0 | (cbp_sel1 << 4);
1955
1956 dev_dbg(di->dev, "using: %x %d %d\n", new_val, cbp_sel0, cbp_sel1);
1957 ret = abx500_set_register_interruptible(di->dev, AB8500_SYS_CTRL2_BLOCK,
1958 AB8500_BATT_OK_REG, new_val);
1959 return ret;
1960}
1961
1962/**
1963 * ab8500_fg_instant_work() - Run the FG state machine instantly
1964 * @work: pointer to the work_struct structure
1965 *
1966 * Work queue function for instant work
1967 */
1968static void ab8500_fg_instant_work(struct work_struct *work)
1969{
1970 struct ab8500_fg *di = container_of(work, struct ab8500_fg, fg_work);
1971
1972 ab8500_fg_algorithm(di);
1973}
1974
1975/**
1976 * ab8500_fg_cc_data_end_handler() - isr to get battery avg current.
1977 * @irq: interrupt number
1978 * @_di: pointer to the ab8500_fg structure
1979 *
1980 * Returns IRQ status(IRQ_HANDLED)
1981 */
1982static irqreturn_t ab8500_fg_cc_data_end_handler(int irq, void *_di)
1983{
1984 struct ab8500_fg *di = _di;
3988a4df
JB		 1985 if (!di->nbr_cceoc_irq_cnt) {
1986 di->nbr_cceoc_irq_cnt++;
1987 complete(&di->ab8500_fg_started);
1988 } else {
1989 di->nbr_cceoc_irq_cnt = 0;
1990 complete(&di->ab8500_fg_complete);
1991 }
13151631
AM		 1992 return IRQ_HANDLED;
1993}
1994
1995/**
1996 * ab8500_fg_cc_convend_handler() - isr to get battery avg current.
1997 * @irq: interrupt number
1998 * @_di: pointer to the ab8500_fg structure
1999 *
2000 * Returns IRQ status(IRQ_HANDLED)
2001 */
2002static irqreturn_t ab8500_fg_cc_int_calib_handler(int irq, void *_di)
2003{
2004 struct ab8500_fg *di = _di;
2005 di->calib_state = AB8500_FG_CALIB_END;
2006 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2007 return IRQ_HANDLED;
2008}
2009
2010/**
2011 * ab8500_fg_cc_convend_handler() - isr to get battery avg current.
2012 * @irq: interrupt number
2013 * @_di: pointer to the ab8500_fg structure
2014 *
2015 * Returns IRQ status(IRQ_HANDLED)
2016 */
2017static irqreturn_t ab8500_fg_cc_convend_handler(int irq, void *_di)
2018{
2019 struct ab8500_fg *di = _di;
2020
2021 queue_work(di->fg_wq, &di->fg_acc_cur_work);
2022
2023 return IRQ_HANDLED;
2024}
2025
2026/**
2027 * ab8500_fg_batt_ovv_handler() - Battery OVV occured
2028 * @irq: interrupt number
2029 * @_di: pointer to the ab8500_fg structure
2030 *
2031 * Returns IRQ status(IRQ_HANDLED)
2032 */
2033static irqreturn_t ab8500_fg_batt_ovv_handler(int irq, void *_di)
2034{
2035 struct ab8500_fg *di = _di;
2036
2037 dev_dbg(di->dev, "Battery OVV\n");
2038 di->flags.bat_ovv = true;
2039 power_supply_changed(&di->fg_psy);
2040
2041 /* Schedule a new HW failure check */
2042 queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work, 0);
2043
2044 return IRQ_HANDLED;
2045}
2046
2047/**
2048 * ab8500_fg_lowbatf_handler() - Battery voltage is below LOW threshold
2049 * @irq: interrupt number
2050 * @_di: pointer to the ab8500_fg structure
2051 *
2052 * Returns IRQ status(IRQ_HANDLED)
2053 */
2054static irqreturn_t ab8500_fg_lowbatf_handler(int irq, void *_di)
2055{
2056 struct ab8500_fg *di = _di;
2057
2058 if (!di->flags.low_bat_delay) {
2059 dev_warn(di->dev, "Battery voltage is below LOW threshold\n");
2060 di->flags.low_bat_delay = true;
2061 /*
2062 * Start a timer to check LOW_BAT again after some time
2063 * This is done to avoid shutdown on single voltage dips
2064 */
2065 queue_delayed_work(di->fg_wq, &di->fg_low_bat_work,
2066 round_jiffies(LOW_BAT_CHECK_INTERVAL));
2067 }
2068 return IRQ_HANDLED;
2069}
2070
2071/**
2072 * ab8500_fg_get_property() - get the fg properties
2073 * @psy: pointer to the power_supply structure
2074 * @psp: pointer to the power_supply_property structure
2075 * @val: pointer to the power_supply_propval union
2076 *
2077 * This function gets called when an application tries to get the
2078 * fg properties by reading the sysfs files.
2079 * voltage_now: battery voltage
2080 * current_now: battery instant current
2081 * current_avg: battery average current
2082 * charge_full_design: capacity where battery is considered full
2083 * charge_now: battery capacity in nAh
2084 * capacity: capacity in percent
2085 * capacity_level: capacity level
2086 *
2087 * Returns error code in case of failure else 0 on success
2088 */
2089static int ab8500_fg_get_property(struct power_supply *psy,
2090 enum power_supply_property psp,
2091 union power_supply_propval *val)
2092{
2093 struct ab8500_fg *di;
2094
2095 di = to_ab8500_fg_device_info(psy);
2096
2097 /*
2098 * If battery is identified as unknown and charging of unknown
2099 * batteries is disabled, we always report 100% capacity and
2100 * capacity level UNKNOWN, since we can't calculate
2101 * remaining capacity
2102 */
2103
2104 switch (psp) {
2105 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
2106 if (di->flags.bat_ovv)
2107 val->intval = BATT_OVV_VALUE * 1000;
2108 else
2109 val->intval = di->vbat * 1000;
2110 break;
2111 case POWER_SUPPLY_PROP_CURRENT_NOW:
2112 val->intval = di->inst_curr * 1000;
2113 break;
2114 case POWER_SUPPLY_PROP_CURRENT_AVG:
2115 val->intval = di->avg_curr * 1000;
2116 break;
2117 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
2118 val->intval = ab8500_fg_convert_mah_to_uwh(di,
2119 di->bat_cap.max_mah_design);
2120 break;
2121 case POWER_SUPPLY_PROP_ENERGY_FULL:
2122 val->intval = ab8500_fg_convert_mah_to_uwh(di,
2123 di->bat_cap.max_mah);
2124 break;
2125 case POWER_SUPPLY_PROP_ENERGY_NOW:
b0284de0 2126 if (di->flags.batt_unknown && !di->bm->chg_unknown_bat &&
13151631
AM		 2127 di->flags.batt_id_received)
2128 val->intval = ab8500_fg_convert_mah_to_uwh(di,
2129 di->bat_cap.max_mah);
2130 else
2131 val->intval = ab8500_fg_convert_mah_to_uwh(di,
2132 di->bat_cap.prev_mah);
2133 break;
2134 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
2135 val->intval = di->bat_cap.max_mah_design;
2136 break;
2137 case POWER_SUPPLY_PROP_CHARGE_FULL:
2138 val->intval = di->bat_cap.max_mah;
2139 break;
2140 case POWER_SUPPLY_PROP_CHARGE_NOW:
b0284de0 2141 if (di->flags.batt_unknown && !di->bm->chg_unknown_bat &&
13151631
AM		 2142 di->flags.batt_id_received)
2143 val->intval = di->bat_cap.max_mah;
2144 else
2145 val->intval = di->bat_cap.prev_mah;
2146 break;
2147 case POWER_SUPPLY_PROP_CAPACITY:
ea402401
MC		 2148 if (di->bm->capacity_scaling)
2149 val->intval = di->bat_cap.cap_scale.scaled_cap;
2150 else if (di->flags.batt_unknown && !di->bm->chg_unknown_bat &&
13151631
AM		 2151 di->flags.batt_id_received)
2152 val->intval = 100;
2153 else
2154 val->intval = di->bat_cap.prev_percent;
2155 break;
2156 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
b0284de0 2157 if (di->flags.batt_unknown && !di->bm->chg_unknown_bat &&
13151631
AM		 2158 di->flags.batt_id_received)
2159 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
2160 else
2161 val->intval = di->bat_cap.prev_level;
2162 break;
2163 default:
2164 return -EINVAL;
2165 }
2166 return 0;
2167}
2168
2169static int ab8500_fg_get_ext_psy_data(struct device *dev, void *data)
2170{
2171 struct power_supply *psy;
2172 struct power_supply *ext;
2173 struct ab8500_fg *di;
2174 union power_supply_propval ret;
2175 int i, j;
2176 bool psy_found = false;
2177
2178 psy = (struct power_supply *)data;
2179 ext = dev_get_drvdata(dev);
2180 di = to_ab8500_fg_device_info(psy);
2181
2182 /*
2183 * For all psy where the name of your driver
2184 * appears in any supplied_to
2185 */
2186 for (i = 0; i < ext->num_supplicants; i++) {
2187 if (!strcmp(ext->supplied_to[i], psy->name))
2188 psy_found = true;
2189 }
2190
2191 if (!psy_found)
2192 return 0;
2193
2194 /* Go through all properties for the psy */
2195 for (j = 0; j < ext->num_properties; j++) {
2196 enum power_supply_property prop;
2197 prop = ext->properties[j];
2198
2199 if (ext->get_property(ext, prop, &ret))
2200 continue;
2201
2202 switch (prop) {
2203 case POWER_SUPPLY_PROP_STATUS:
2204 switch (ext->type) {
2205 case POWER_SUPPLY_TYPE_BATTERY:
2206 switch (ret.intval) {
2207 case POWER_SUPPLY_STATUS_UNKNOWN:
2208 case POWER_SUPPLY_STATUS_DISCHARGING:
2209 case POWER_SUPPLY_STATUS_NOT_CHARGING:
2210 if (!di->flags.charging)
2211 break;
2212 di->flags.charging = false;
2213 di->flags.fully_charged = false;
ea402401
MC		 2214 if (di->bm->capacity_scaling)
2215 ab8500_fg_update_cap_scalers(di);
13151631
AM		 2216 queue_work(di->fg_wq, &di->fg_work);
2217 break;
2218 case POWER_SUPPLY_STATUS_FULL:
2219 if (di->flags.fully_charged)
2220 break;
2221 di->flags.fully_charged = true;
2222 di->flags.force_full = true;
2223 /* Save current capacity as maximum */
2224 di->bat_cap.max_mah = di->bat_cap.mah;
2225 queue_work(di->fg_wq, &di->fg_work);
2226 break;
2227 case POWER_SUPPLY_STATUS_CHARGING:
ea402401
MC		 2228 if (di->flags.charging &&
2229 !di->flags.fully_charged)
13151631
AM		 2230 break;
2231 di->flags.charging = true;
2232 di->flags.fully_charged = false;
ea402401
MC		 2233 if (di->bm->capacity_scaling)
2234 ab8500_fg_update_cap_scalers(di);
13151631
AM		 2235 queue_work(di->fg_wq, &di->fg_work);
2236 break;
2237 };
2238 default:
2239 break;
2240 };
2241 break;
2242 case POWER_SUPPLY_PROP_TECHNOLOGY:
2243 switch (ext->type) {
2244 case POWER_SUPPLY_TYPE_BATTERY:
2245 if (!di->flags.batt_id_received) {
c34a61b4
AV		 2246 const struct abx500_battery_type *b;
2247
b0284de0 2248 b = &(di->bm->bat_type[di->bm->batt_id]);
13151631
AM		 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->type) {
2273 case POWER_SUPPLY_TYPE_BATTERY:
ea402401
MC		 2274 if (di->flags.batt_id_received)
2275 di->bat_temp = ret.intval;
13151631
AM		 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 */
2294static 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(
b0284de0 2325 di->bm->fg_params->lowbat_threshold) << 1 |
13151631
AM		 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 }
2338out:
2339 return ret;
2340}
2341
2342/**
2343 * ab8500_fg_external_power_changed() - callback for power supply changes
2344 * @psy: pointer to the structure power_supply
2345 *
2346 * This function is the entry point of the pointer external_power_changed
2347 * of the structure power_supply.
2348 * This function gets executed when there is a change in any external power
2349 * supply that this driver needs to be notified of.
2350 */
2351static void ab8500_fg_external_power_changed(struct power_supply *psy)
2352{
2353 struct ab8500_fg *di = to_ab8500_fg_device_info(psy);
2354
2355 class_for_each_device(power_supply_class, NULL,
2356 &di->fg_psy, ab8500_fg_get_ext_psy_data);
2357}
2358
2359/**
2360 * abab8500_fg_reinit_work() - work to reset the FG algorithm
2361 * @work: pointer to the work_struct structure
2362 *
2363 * Used to reset the current battery capacity to be able to
2364 * retrigger a new voltage base capacity calculation. For
2365 * test and verification purpose.
2366 */
2367static void ab8500_fg_reinit_work(struct work_struct *work)
2368{
2369 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
2370 fg_reinit_work.work);
2371
2372 if (di->flags.calibrate == false) {
2373 dev_dbg(di->dev, "Resetting FG state machine to init.\n");
2374 ab8500_fg_clear_cap_samples(di);
2375 ab8500_fg_calc_cap_discharge_voltage(di, true);
2376 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
2377 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT);
2378 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2379
2380 } else {
2381 dev_err(di->dev, "Residual offset calibration ongoing "
2382 "retrying..\n");
2383 /* Wait one second until next try*/
2384 queue_delayed_work(di->fg_wq, &di->fg_reinit_work,
2385 round_jiffies(1));
2386 }
2387}
2388
2389/**
2390 * ab8500_fg_reinit() - forces FG algorithm to reinitialize with current values
2391 *
2392 * This function can be used to force the FG algorithm to recalculate a new
2393 * voltage based battery capacity.
2394 */
2395void ab8500_fg_reinit(void)
2396{
2397 struct ab8500_fg *di = ab8500_fg_get();
2398 /* User won't be notified if a null pointer returned. */
2399 if (di != NULL)
2400 queue_delayed_work(di->fg_wq, &di->fg_reinit_work, 0);
2401}
2402
2403/* Exposure to the sysfs interface */
2404
2405struct ab8500_fg_sysfs_entry {
2406 struct attribute attr;
2407 ssize_t (*show)(struct ab8500_fg *, char *);
2408 ssize_t (*store)(struct ab8500_fg *, const char *, size_t);
2409};
2410
2411static ssize_t charge_full_show(struct ab8500_fg *di, char *buf)
2412{
2413 return sprintf(buf, "%d\n", di->bat_cap.max_mah);
2414}
2415
2416static ssize_t charge_full_store(struct ab8500_fg *di, const char *buf,
2417 size_t count)
2418{
2419 unsigned long charge_full;
2420 ssize_t ret = -EINVAL;
2421
2422 ret = strict_strtoul(buf, 10, &charge_full);
2423
5ae2b822 2424 dev_dbg(di->dev, "Ret %zd charge_full %lu", ret, charge_full);
13151631
AM		 2425
2426 if (!ret) {
2427 di->bat_cap.max_mah = (int) charge_full;
2428 ret = count;
2429 }
2430 return ret;
2431}
2432
2433static ssize_t charge_now_show(struct ab8500_fg *di, char *buf)
2434{
2435 return sprintf(buf, "%d\n", di->bat_cap.prev_mah);
2436}
2437
2438static ssize_t charge_now_store(struct ab8500_fg *di, const char *buf,
2439 size_t count)
2440{
2441 unsigned long charge_now;
2442 ssize_t ret;
2443
2444 ret = strict_strtoul(buf, 10, &charge_now);
2445
5ae2b822 2446 dev_dbg(di->dev, "Ret %zd charge_now %lu was %d",
13151631
AM		 2447 ret, charge_now, di->bat_cap.prev_mah);
2448
2449 if (!ret) {
2450 di->bat_cap.user_mah = (int) charge_now;
2451 di->flags.user_cap = true;
2452 ret = count;
2453 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2454 }
2455 return ret;
2456}
2457
2458static struct ab8500_fg_sysfs_entry charge_full_attr =
2459 __ATTR(charge_full, 0644, charge_full_show, charge_full_store);
2460
2461static struct ab8500_fg_sysfs_entry charge_now_attr =
2462 __ATTR(charge_now, 0644, charge_now_show, charge_now_store);
2463
2464static ssize_t
2465ab8500_fg_show(struct kobject *kobj, struct attribute *attr, char *buf)
2466{
2467 struct ab8500_fg_sysfs_entry *entry;
2468 struct ab8500_fg *di;
2469
2470 entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr);
2471 di = container_of(kobj, struct ab8500_fg, fg_kobject);
2472
2473 if (!entry->show)
2474 return -EIO;
2475
2476 return entry->show(di, buf);
2477}
2478static ssize_t
2479ab8500_fg_store(struct kobject *kobj, struct attribute *attr, const char *buf,
2480 size_t count)
2481{
2482 struct ab8500_fg_sysfs_entry *entry;
2483 struct ab8500_fg *di;
2484
2485 entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr);
2486 di = container_of(kobj, struct ab8500_fg, fg_kobject);
2487
2488 if (!entry->store)
2489 return -EIO;
2490
2491 return entry->store(di, buf, count);
2492}
2493
64eb9b02 2494static const struct sysfs_ops ab8500_fg_sysfs_ops = {
13151631
AM		 2495 .show = ab8500_fg_show,
2496 .store = ab8500_fg_store,
2497};
2498
2499static struct attribute *ab8500_fg_attrs[] = {
2500 &charge_full_attr.attr,
2501 &charge_now_attr.attr,
2502 NULL,
2503};
2504
2505static struct kobj_type ab8500_fg_ktype = {
2506 .sysfs_ops = &ab8500_fg_sysfs_ops,
2507 .default_attrs = ab8500_fg_attrs,
2508};
2509
2510/**
2511 * ab8500_chargalg_sysfs_exit() - de-init of sysfs entry
2512 * @di: pointer to the struct ab8500_chargalg
2513 *
2514 * This function removes the entry in sysfs.
2515 */
2516static void ab8500_fg_sysfs_exit(struct ab8500_fg *di)
2517{
2518 kobject_del(&di->fg_kobject);
2519}
2520
2521/**
2522 * ab8500_chargalg_sysfs_init() - init of sysfs entry
2523 * @di: pointer to the struct ab8500_chargalg
2524 *
2525 * This function adds an entry in sysfs.
2526 * Returns error code in case of failure else 0(on success)
2527 */
2528static int ab8500_fg_sysfs_init(struct ab8500_fg *di)
2529{
2530 int ret = 0;
2531
2532 ret = kobject_init_and_add(&di->fg_kobject,
2533 &ab8500_fg_ktype,
2534 NULL, "battery");
2535 if (ret < 0)
2536 dev_err(di->dev, "failed to create sysfs entry\n");
2537
2538 return ret;
2539}
2540/* Exposure to the sysfs interface <<END>> */
2541
2542#if defined(CONFIG_PM)
2543static int ab8500_fg_resume(struct platform_device *pdev)
2544{
2545 struct ab8500_fg *di = platform_get_drvdata(pdev);
2546
2547 /*
2548 * Change state if we're not charging. If we're charging we will wake
2549 * up on the FG IRQ
2550 */
2551 if (!di->flags.charging) {
2552 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_WAKEUP);
2553 queue_work(di->fg_wq, &di->fg_work);
2554 }
2555
2556 return 0;
2557}
2558
2559static int ab8500_fg_suspend(struct platform_device *pdev,
2560 pm_message_t state)
2561{
2562 struct ab8500_fg *di = platform_get_drvdata(pdev);
2563
2564 flush_delayed_work(&di->fg_periodic_work);
2565
2566 /*
2567 * If the FG is enabled we will disable it before going to suspend
2568 * only if we're not charging
2569 */
2570 if (di->flags.fg_enabled && !di->flags.charging)
2571 ab8500_fg_coulomb_counter(di, false);
2572
2573 return 0;
2574}
2575#else
2576#define ab8500_fg_suspend NULL
2577#define ab8500_fg_resume NULL
2578#endif
2579
415ec69f 2580static int ab8500_fg_remove(struct platform_device *pdev)
13151631
AM		 2581{
2582 int ret = 0;
2583 struct ab8500_fg *di = platform_get_drvdata(pdev);
2584
2585 list_del(&di->node);
2586
2587 /* Disable coulomb counter */
2588 ret = ab8500_fg_coulomb_counter(di, false);
2589 if (ret)
2590 dev_err(di->dev, "failed to disable coulomb counter\n");
2591
2592 destroy_workqueue(di->fg_wq);
2593 ab8500_fg_sysfs_exit(di);
2594
2595 flush_scheduled_work();
2596 power_supply_unregister(&di->fg_psy);
2597 platform_set_drvdata(pdev, NULL);
13151631
AM		 2598 return ret;
2599}
2600
2601/* ab8500 fg driver interrupts and their respective isr */
2602static struct ab8500_fg_interrupts ab8500_fg_irq[] = {
2603 {"NCONV_ACCU", ab8500_fg_cc_convend_handler},
2604 {"BATT_OVV", ab8500_fg_batt_ovv_handler},
2605 {"LOW_BAT_F", ab8500_fg_lowbatf_handler},
2606 {"CC_INT_CALIB", ab8500_fg_cc_int_calib_handler},
2607 {"CCEOC", ab8500_fg_cc_data_end_handler},
2608};
2609
e0f1abeb
R		 2610static char *supply_interface[] = {
2611 "ab8500_chargalg",
2612 "ab8500_usb",
2613};
2614
c8afa640 2615static int ab8500_fg_probe(struct platform_device *pdev)
13151631 2616{
e0f1abeb 2617 struct device_node *np = pdev->dev.of_node;
195c1c66 2618 struct abx500_bm_data *plat = pdev->dev.platform_data;
e0f1abeb 2619 struct ab8500_fg *di;
13151631
AM		 2620 int i, irq;
2621 int ret = 0;
13151631 2622
e0f1abeb
R		 2623 di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
2624 if (!di) {
2625 dev_err(&pdev->dev, "%s no mem for ab8500_fg\n", __func__);
13151631 2626 return -ENOMEM;
e0f1abeb 2627 }
195c1c66
LJ		 2628
2629 if (!plat) {
2630 dev_err(&pdev->dev, "no battery management data supplied\n");
2631 return -EINVAL;
2632 }
2633 di->bm = plat;
2634
2635 if (np) {
2636 ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
2637 if (ret) {
2638 dev_err(&pdev->dev, "failed to get battery information\n");
2639 return ret;
e0f1abeb 2640 }
e0f1abeb 2641 }
13151631
AM		 2642
2643 mutex_init(&di->cc_lock);
2644
2645 /* get parent data */
2646 di->dev = &pdev->dev;
2647 di->parent = dev_get_drvdata(pdev->dev.parent);
2648 di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
2649
13151631
AM		 2650 di->fg_psy.name = "ab8500_fg";
2651 di->fg_psy.type = POWER_SUPPLY_TYPE_BATTERY;
2652 di->fg_psy.properties = ab8500_fg_props;
2653 di->fg_psy.num_properties = ARRAY_SIZE(ab8500_fg_props);
2654 di->fg_psy.get_property = ab8500_fg_get_property;
e0f1abeb
R		 2655 di->fg_psy.supplied_to = supply_interface;
2656 di->fg_psy.num_supplicants = ARRAY_SIZE(supply_interface),
13151631
AM		 2657 di->fg_psy.external_power_changed = ab8500_fg_external_power_changed;
2658
2659 di->bat_cap.max_mah_design = MILLI_TO_MICRO *
b0284de0 2660 di->bm->bat_type[di->bm->batt_id].charge_full_design;
13151631
AM		 2661
2662 di->bat_cap.max_mah = di->bat_cap.max_mah_design;
2663
b0284de0 2664 di->vbat_nom = di->bm->bat_type[di->bm->batt_id].nominal_voltage;
13151631
AM		 2665
2666 di->init_capacity = true;
2667
2668 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
2669 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT);
2670
2671 /* Create a work queue for running the FG algorithm */
2672 di->fg_wq = create_singlethread_workqueue("ab8500_fg_wq");
2673 if (di->fg_wq == NULL) {
2674 dev_err(di->dev, "failed to create work queue\n");
e0f1abeb 2675 return -ENOMEM;
13151631
AM		 2676 }
2677
2678 /* Init work for running the fg algorithm instantly */
2679 INIT_WORK(&di->fg_work, ab8500_fg_instant_work);
2680
2681 /* Init work for getting the battery accumulated current */
2682 INIT_WORK(&di->fg_acc_cur_work, ab8500_fg_acc_cur_work);
2683
2684 /* Init work for reinitialising the fg algorithm */
203b42f7 2685 INIT_DEFERRABLE_WORK(&di->fg_reinit_work,
13151631
AM		 2686 ab8500_fg_reinit_work);
2687
2688 /* Work delayed Queue to run the state machine */
203b42f7 2689 INIT_DEFERRABLE_WORK(&di->fg_periodic_work,
13151631
AM		 2690 ab8500_fg_periodic_work);
2691
2692 /* Work to check low battery condition */
203b42f7 2693 INIT_DEFERRABLE_WORK(&di->fg_low_bat_work,
13151631
AM		 2694 ab8500_fg_low_bat_work);
2695
2696 /* Init work for HW failure check */
203b42f7 2697 INIT_DEFERRABLE_WORK(&di->fg_check_hw_failure_work,
13151631
AM		 2698 ab8500_fg_check_hw_failure_work);
2699
2700 /* Initialize OVV, and other registers */
2701 ret = ab8500_fg_init_hw_registers(di);
2702 if (ret) {
2703 dev_err(di->dev, "failed to initialize registers\n");
2704 goto free_inst_curr_wq;
2705 }
2706
2707 /* Consider battery unknown until we're informed otherwise */
2708 di->flags.batt_unknown = true;
2709 di->flags.batt_id_received = false;
2710
2711 /* Register FG power supply class */
2712 ret = power_supply_register(di->dev, &di->fg_psy);
2713 if (ret) {
2714 dev_err(di->dev, "failed to register FG psy\n");
2715 goto free_inst_curr_wq;
2716 }
2717
b0284de0 2718 di->fg_samples = SEC_TO_SAMPLE(di->bm->fg_params->init_timer);
13151631
AM		 2719 ab8500_fg_coulomb_counter(di, true);
2720
3988a4df
JB		 2721 /*
2722 * Initialize completion used to notify completion and start
2723 * of inst current
2724 */
2725 init_completion(&di->ab8500_fg_started);
13151631
AM		 2726 init_completion(&di->ab8500_fg_complete);
2727
2728 /* Register interrupts */
2729 for (i = 0; i < ARRAY_SIZE(ab8500_fg_irq); i++) {
2730 irq = platform_get_irq_byname(pdev, ab8500_fg_irq[i].name);
2731 ret = request_threaded_irq(irq, NULL, ab8500_fg_irq[i].isr,
2732 IRQF_SHARED | IRQF_NO_SUSPEND,
2733 ab8500_fg_irq[i].name, di);
2734
2735 if (ret != 0) {
2736 dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
2737 , ab8500_fg_irq[i].name, irq, ret);
2738 goto free_irq;
2739 }
2740 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
2741 ab8500_fg_irq[i].name, irq, ret);
2742 }
2743 di->irq = platform_get_irq_byname(pdev, "CCEOC");
2744 disable_irq(di->irq);
3988a4df 2745 di->nbr_cceoc_irq_cnt = 0;
13151631
AM		 2746
2747 platform_set_drvdata(pdev, di);
2748
2749 ret = ab8500_fg_sysfs_init(di);
2750 if (ret) {
2751 dev_err(di->dev, "failed to create sysfs entry\n");
2752 goto free_irq;
2753 }
2754
2755 /* Calibrate the fg first time */
2756 di->flags.calibrate = true;
2757 di->calib_state = AB8500_FG_CALIB_INIT;
2758
2759 /* Use room temp as default value until we get an update from driver. */
2760 di->bat_temp = 210;
2761
2762 /* Run the FG algorithm */
2763 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2764
2765 list_add_tail(&di->node, &ab8500_fg_list);
2766
2767 return ret;
2768
2769free_irq:
2770 power_supply_unregister(&di->fg_psy);
2771
2772 /* We also have to free all successfully registered irqs */
2773 for (i = i - 1; i >= 0; i--) {
2774 irq = platform_get_irq_byname(pdev, ab8500_fg_irq[i].name);
2775 free_irq(irq, di);
2776 }
2777free_inst_curr_wq:
2778 destroy_workqueue(di->fg_wq);
13151631
AM		 2779 return ret;
2780}
2781
e0f1abeb
R		 2782static const struct of_device_id ab8500_fg_match[] = {
2783 { .compatible = "stericsson,ab8500-fg", },
2784 { },
2785};
2786
13151631
AM		 2787static struct platform_driver ab8500_fg_driver = {
2788 .probe = ab8500_fg_probe,
28ea73f4 2789 .remove = ab8500_fg_remove,
13151631
AM		 2790 .suspend = ab8500_fg_suspend,
2791 .resume = ab8500_fg_resume,
2792 .driver = {
2793 .name = "ab8500-fg",
2794 .owner = THIS_MODULE,
e0f1abeb 2795 .of_match_table = ab8500_fg_match,
13151631
AM		 2796 },
2797};
2798
2799static int __init ab8500_fg_init(void)
2800{
2801 return platform_driver_register(&ab8500_fg_driver);
2802}
2803
2804static void __exit ab8500_fg_exit(void)
2805{
2806 platform_driver_unregister(&ab8500_fg_driver);
2807}
2808
2809subsys_initcall_sync(ab8500_fg_init);
2810module_exit(ab8500_fg_exit);
2811
2812MODULE_LICENSE("GPL v2");
2813MODULE_AUTHOR("Johan Palsson, Karl Komierowski");
2814MODULE_ALIAS("platform:ab8500-fg");
2815MODULE_DESCRIPTION("AB8500 Fuel Gauge driver");
Linux 6.x block layer and io_uring tree(s)