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authorArun Murthy <arun.murthy@stericsson.com>2012-02-29 11:24:27 -0500
committerAnton Vorontsov <anton.vorontsov@linaro.org>2012-03-26 12:41:05 -0400
commit13151631b5bd06a1511353bb221079bbd76606c3 (patch)
tree2afb3cf50f11468506e5fd65677005c2bdfacaf0 /drivers/power
parent84edbeeab67c1575067335179513150115da367b (diff)
ab8500-fg: A8500 fuel gauge driver
This driver is responsible for provide battery parameters to user space via sysfs by registers to power supply class. It uses fuel gauge and gpadc driver in obtaining the battery parameters. These battery properties are used by abx500 charging algorithm driver to monitor the battery. Signed-off-by: Arun Murthy <arun.murthy@stericsson.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/ab8500_fg.c2636
1 files changed, 2636 insertions, 0 deletions
diff --git a/drivers/power/ab8500_fg.c b/drivers/power/ab8500_fg.c
new file mode 100644
index 000000000000..41ccb70d4018
--- /dev/null
+++ b/drivers/power/ab8500_fg.c
@@ -0,0 +1,2636 @@
1/*
2 * Copyright (C) ST-Ericsson AB 2012
3 *
4 * Main and Back-up battery management driver.
5 *
6 * Note: Backup battery management is required in case of Li-Ion battery and not
7 * for capacitive battery. HREF boards have capacitive battery and hence backup
8 * battery management is not used and the supported code is available in this
9 * driver.
10 *
11 * License Terms: GNU General Public License v2
12 * Author:
13 * Johan Palsson <johan.palsson@stericsson.com>
14 * Karl Komierowski <karl.komierowski@stericsson.com>
15 * Arun R Murthy <arun.murthy@stericsson.com>
16 */
17
18#include <linux/init.h>
19#include <linux/module.h>
20#include <linux/device.h>
21#include <linux/interrupt.h>
22#include <linux/platform_device.h>
23#include <linux/power_supply.h>
24#include <linux/kobject.h>
25#include <linux/mfd/abx500/ab8500.h>
26#include <linux/mfd/abx500.h>
27#include <linux/slab.h>
28#include <linux/mfd/abx500/ab8500-bm.h>
29#include <linux/delay.h>
30#include <linux/mfd/abx500/ab8500-gpadc.h>
31#include <linux/mfd/abx500.h>
32#include <linux/time.h>
33#include <linux/completion.h>
34
35#define MILLI_TO_MICRO 1000
36#define FG_LSB_IN_MA 1627
37#define QLSB_NANO_AMP_HOURS_X10 1129
38#define INS_CURR_TIMEOUT (3 * HZ)
39
40#define SEC_TO_SAMPLE(S) (S * 4)
41
42#define NBR_AVG_SAMPLES 20
43
44#define LOW_BAT_CHECK_INTERVAL (2 * HZ)
45
46#define VALID_CAPACITY_SEC (45 * 60) /* 45 minutes */
47#define BATT_OK_MIN 2360 /* mV */
48#define BATT_OK_INCREMENT 50 /* mV */
49#define BATT_OK_MAX_NR_INCREMENTS 0xE
50
51/* FG constants */
52#define BATT_OVV 0x01
53
54#define interpolate(x, x1, y1, x2, y2) \
55 ((y1) + ((((y2) - (y1)) * ((x) - (x1))) / ((x2) - (x1))));
56
57#define to_ab8500_fg_device_info(x) container_of((x), \
58 struct ab8500_fg, fg_psy);
59
60/**
61 * struct ab8500_fg_interrupts - ab8500 fg interupts
62 * @name: name of the interrupt
63 * @isr function pointer to the isr
64 */
65struct ab8500_fg_interrupts {
66 char *name;
67 irqreturn_t (*isr)(int irq, void *data);
68};
69
70enum 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
80static 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
90enum ab8500_fg_charge_state {
91 AB8500_FG_CHARGE_INIT,
92 AB8500_FG_CHARGE_READOUT,
93};
94
95static char *charge_state[] = {
96 "CHARGE_INIT",
97 "CHARGE_READOUT",
98};
99
100enum ab8500_fg_calibration_state {
101 AB8500_FG_CALIB_INIT,
102 AB8500_FG_CALIB_WAIT,
103 AB8500_FG_CALIB_END,
104};
105
106struct ab8500_fg_avg_cap {
107 int avg;
108 int samples[NBR_AVG_SAMPLES];
109 __kernel_time_t time_stamps[NBR_AVG_SAMPLES];
110 int pos;
111 int nbr_samples;
112 int sum;
113};
114
115struct ab8500_fg_battery_capacity {
116 int max_mah_design;
117 int max_mah;
118 int mah;
119 int permille;
120 int level;
121 int prev_mah;
122 int prev_percent;
123 int prev_level;
124 int user_mah;
125};
126
127struct ab8500_fg_flags {
128 bool fg_enabled;
129 bool conv_done;
130 bool charging;
131 bool fully_charged;
132 bool force_full;
133 bool low_bat_delay;
134 bool low_bat;
135 bool bat_ovv;
136 bool batt_unknown;
137 bool calibrate;
138 bool user_cap;
139 bool batt_id_received;
140};
141
142struct inst_curr_result_list {
143 struct list_head list;
144 int *result;
145};
146
147/**
148 * struct ab8500_fg - ab8500 FG device information
149 * @dev: Pointer to the structure device
150 * @node: a list of AB8500 FGs, hence prepared for reentrance
151 * @irq holds the CCEOC interrupt number
152 * @vbat: Battery voltage in mV
153 * @vbat_nom: Nominal battery voltage in mV
154 * @inst_curr: Instantenous battery current in mA
155 * @avg_curr: Average battery current in mA
156 * @bat_temp battery temperature
157 * @fg_samples: Number of samples used in the FG accumulation
158 * @accu_charge: Accumulated charge from the last conversion
159 * @recovery_cnt: Counter for recovery mode
160 * @high_curr_cnt: Counter for high current mode
161 * @init_cnt: Counter for init mode
162 * @recovery_needed: Indicate if recovery is needed
163 * @high_curr_mode: Indicate if we're in high current mode
164 * @init_capacity: Indicate if initial capacity measuring should be done
165 * @turn_off_fg: True if fg was off before current measurement
166 * @calib_state State during offset calibration
167 * @discharge_state: Current discharge state
168 * @charge_state: Current charge state
169 * @ab8500_fg_complete Completion struct used for the instant current reading
170 * @flags: Structure for information about events triggered
171 * @bat_cap: Structure for battery capacity specific parameters
172 * @avg_cap: Average capacity filter
173 * @parent: Pointer to the struct ab8500
174 * @gpadc: Pointer to the struct gpadc
175 * @pdata: Pointer to the abx500_fg platform data
176 * @bat: Pointer to the abx500_bm platform data
177 * @fg_psy: Structure that holds the FG specific battery properties
178 * @fg_wq: Work queue for running the FG algorithm
179 * @fg_periodic_work: Work to run the FG algorithm periodically
180 * @fg_low_bat_work: Work to check low bat condition
181 * @fg_reinit_work Work used to reset and reinitialise the FG algorithm
182 * @fg_work: Work to run the FG algorithm instantly
183 * @fg_acc_cur_work: Work to read the FG accumulator
184 * @fg_check_hw_failure_work: Work for checking HW state
185 * @cc_lock: Mutex for locking the CC
186 * @fg_kobject: Structure of type kobject
187 */
188struct ab8500_fg {
189 struct device *dev;
190 struct list_head node;
191 int irq;
192 int vbat;
193 int vbat_nom;
194 int inst_curr;
195 int avg_curr;
196 int bat_temp;
197 int fg_samples;
198 int accu_charge;
199 int recovery_cnt;
200 int high_curr_cnt;
201 int init_cnt;
202 bool recovery_needed;
203 bool high_curr_mode;
204 bool init_capacity;
205 bool turn_off_fg;
206 enum ab8500_fg_calibration_state calib_state;
207 enum ab8500_fg_discharge_state discharge_state;
208 enum ab8500_fg_charge_state charge_state;
209 struct completion ab8500_fg_complete;
210 struct ab8500_fg_flags flags;
211 struct ab8500_fg_battery_capacity bat_cap;
212 struct ab8500_fg_avg_cap avg_cap;
213 struct ab8500 *parent;
214 struct ab8500_gpadc *gpadc;
215 struct abx500_fg_platform_data *pdata;
216 struct abx500_bm_data *bat;
217 struct power_supply fg_psy;
218 struct workqueue_struct *fg_wq;
219 struct delayed_work fg_periodic_work;
220 struct delayed_work fg_low_bat_work;
221 struct delayed_work fg_reinit_work;
222 struct work_struct fg_work;
223 struct work_struct fg_acc_cur_work;
224 struct delayed_work fg_check_hw_failure_work;
225 struct mutex cc_lock;
226 struct kobject fg_kobject;
227};
228static LIST_HEAD(ab8500_fg_list);
229
230/**
231 * ab8500_fg_get() - returns a reference to the primary AB8500 fuel gauge
232 * (i.e. the first fuel gauge in the instance list)
233 */
234struct ab8500_fg *ab8500_fg_get(void)
235{
236 struct ab8500_fg *fg;
237
238 if (list_empty(&ab8500_fg_list))
239 return NULL;
240
241 fg = list_first_entry(&ab8500_fg_list, struct ab8500_fg, node);
242 return fg;
243}
244
245/* Main battery properties */
246static enum power_supply_property ab8500_fg_props[] = {
247 POWER_SUPPLY_PROP_VOLTAGE_NOW,
248 POWER_SUPPLY_PROP_CURRENT_NOW,
249 POWER_SUPPLY_PROP_CURRENT_AVG,
250 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
251 POWER_SUPPLY_PROP_ENERGY_FULL,
252 POWER_SUPPLY_PROP_ENERGY_NOW,
253 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
254 POWER_SUPPLY_PROP_CHARGE_FULL,
255 POWER_SUPPLY_PROP_CHARGE_NOW,
256 POWER_SUPPLY_PROP_CAPACITY,
257 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
258};
259
260/*
261 * This array maps the raw hex value to lowbat voltage used by the AB8500
262 * Values taken from the UM0836
263 */
264static int ab8500_fg_lowbat_voltage_map[] = {
265 2300 ,
266 2325 ,
267 2350 ,
268 2375 ,
269 2400 ,
270 2425 ,
271 2450 ,
272 2475 ,
273 2500 ,
274 2525 ,
275 2550 ,
276 2575 ,
277 2600 ,
278 2625 ,
279 2650 ,
280 2675 ,
281 2700 ,
282 2725 ,
283 2750 ,
284 2775 ,
285 2800 ,
286 2825 ,
287 2850 ,
288 2875 ,
289 2900 ,
290 2925 ,
291 2950 ,
292 2975 ,
293 3000 ,
294 3025 ,
295 3050 ,
296 3075 ,
297 3100 ,
298 3125 ,
299 3150 ,
300 3175 ,
301 3200 ,
302 3225 ,
303 3250 ,
304 3275 ,
305 3300 ,
306 3325 ,
307 3350 ,
308 3375 ,
309 3400 ,
310 3425 ,
311 3450 ,
312 3475 ,
313 3500 ,
314 3525 ,
315 3550 ,
316 3575 ,
317 3600 ,
318 3625 ,
319 3650 ,
320 3675 ,
321 3700 ,
322 3725 ,
323 3750 ,
324 3775 ,
325 3800 ,
326 3825 ,
327 3850 ,
328 3850 ,
329};
330
331static u8 ab8500_volt_to_regval(int voltage)
332{
333 int i;
334
335 if (voltage < ab8500_fg_lowbat_voltage_map[0])
336 return 0;
337
338 for (i = 0; i < ARRAY_SIZE(ab8500_fg_lowbat_voltage_map); i++) {
339 if (voltage < ab8500_fg_lowbat_voltage_map[i])
340 return (u8) i - 1;
341 }
342
343 /* If not captured above, return index of last element */
344 return (u8) ARRAY_SIZE(ab8500_fg_lowbat_voltage_map) - 1;
345}
346
347/**
348 * ab8500_fg_is_low_curr() - Low or high current mode
349 * @di: pointer to the ab8500_fg structure
350 * @curr: the current to base or our decision on
351 *
352 * Low current mode if the current consumption is below a certain threshold
353 */
354static int ab8500_fg_is_low_curr(struct ab8500_fg *di, int curr)
355{
356 /*
357 * We want to know if we're in low current mode
358 */
359 if (curr > -di->bat->fg_params->high_curr_threshold)
360 return true;
361 else
362 return false;
363}
364
365/**
366 * ab8500_fg_add_cap_sample() - Add capacity to average filter
367 * @di: pointer to the ab8500_fg structure
368 * @sample: the capacity in mAh to add to the filter
369 *
370 * A capacity is added to the filter and a new mean capacity is calculated and
371 * returned
372 */
373static int ab8500_fg_add_cap_sample(struct ab8500_fg *di, int sample)
374{
375 struct timespec ts;
376 struct ab8500_fg_avg_cap *avg = &di->avg_cap;
377
378 getnstimeofday(&ts);
379
380 do {
381 avg->sum += sample - avg->samples[avg->pos];
382 avg->samples[avg->pos] = sample;
383 avg->time_stamps[avg->pos] = ts.tv_sec;
384 avg->pos++;
385
386 if (avg->pos == NBR_AVG_SAMPLES)
387 avg->pos = 0;
388
389 if (avg->nbr_samples < NBR_AVG_SAMPLES)
390 avg->nbr_samples++;
391
392 /*
393 * Check the time stamp for each sample. If too old,
394 * replace with latest sample
395 */
396 } while (ts.tv_sec - VALID_CAPACITY_SEC > avg->time_stamps[avg->pos]);
397
398 avg->avg = avg->sum / avg->nbr_samples;
399
400 return avg->avg;
401}
402
403/**
404 * ab8500_fg_clear_cap_samples() - Clear average filter
405 * @di: pointer to the ab8500_fg structure
406 *
407 * The capacity filter is is reset to zero.
408 */
409static void ab8500_fg_clear_cap_samples(struct ab8500_fg *di)
410{
411 int i;
412 struct ab8500_fg_avg_cap *avg = &di->avg_cap;
413
414 avg->pos = 0;
415 avg->nbr_samples = 0;
416 avg->sum = 0;
417 avg->avg = 0;
418
419 for (i = 0; i < NBR_AVG_SAMPLES; i++) {
420 avg->samples[i] = 0;
421 avg->time_stamps[i] = 0;
422 }
423}
424
425/**
426 * ab8500_fg_fill_cap_sample() - Fill average filter
427 * @di: pointer to the ab8500_fg structure
428 * @sample: the capacity in mAh to fill the filter with
429 *
430 * The capacity filter is filled with a capacity in mAh
431 */
432static void ab8500_fg_fill_cap_sample(struct ab8500_fg *di, int sample)
433{
434 int i;
435 struct timespec ts;
436 struct ab8500_fg_avg_cap *avg = &di->avg_cap;
437
438 getnstimeofday(&ts);
439
440 for (i = 0; i < NBR_AVG_SAMPLES; i++) {
441 avg->samples[i] = sample;
442 avg->time_stamps[i] = ts.tv_sec;
443 }
444
445 avg->pos = 0;
446 avg->nbr_samples = NBR_AVG_SAMPLES;
447 avg->sum = sample * NBR_AVG_SAMPLES;
448 avg->avg = sample;
449}
450
451/**
452 * ab8500_fg_coulomb_counter() - enable coulomb counter
453 * @di: pointer to the ab8500_fg structure
454 * @enable: enable/disable
455 *
456 * Enable/Disable coulomb counter.
457 * On failure returns negative value.
458 */
459static int ab8500_fg_coulomb_counter(struct ab8500_fg *di, bool enable)
460{
461 int ret = 0;
462 mutex_lock(&di->cc_lock);
463 if (enable) {
464 /* To be able to reprogram the number of samples, we have to
465 * first stop the CC and then enable it again */
466 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
467 AB8500_RTC_CC_CONF_REG, 0x00);
468 if (ret)
469 goto cc_err;
470
471 /* Program the samples */
472 ret = abx500_set_register_interruptible(di->dev,
473 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU,
474 di->fg_samples);
475 if (ret)
476 goto cc_err;
477
478 /* Start the CC */
479 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
480 AB8500_RTC_CC_CONF_REG,
481 (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA));
482 if (ret)
483 goto cc_err;
484
485 di->flags.fg_enabled = true;
486 } else {
487 /* Clear any pending read requests */
488 ret = abx500_set_register_interruptible(di->dev,
489 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 0);
490 if (ret)
491 goto cc_err;
492
493 ret = abx500_set_register_interruptible(di->dev,
494 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU_CTRL, 0);
495 if (ret)
496 goto cc_err;
497
498 /* Stop the CC */
499 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
500 AB8500_RTC_CC_CONF_REG, 0);
501 if (ret)
502 goto cc_err;
503
504 di->flags.fg_enabled = false;
505
506 }
507 dev_dbg(di->dev, " CC enabled: %d Samples: %d\n",
508 enable, di->fg_samples);
509
510 mutex_unlock(&di->cc_lock);
511
512 return ret;
513cc_err:
514 dev_err(di->dev, "%s Enabling coulomb counter failed\n", __func__);
515 mutex_unlock(&di->cc_lock);
516 return ret;
517}
518
519/**
520 * ab8500_fg_inst_curr_start() - start battery instantaneous current
521 * @di: pointer to the ab8500_fg structure
522 *
523 * Returns 0 or error code
524 * Note: This is part "one" and has to be called before
525 * ab8500_fg_inst_curr_finalize()
526 */
527 int ab8500_fg_inst_curr_start(struct ab8500_fg *di)
528{
529 u8 reg_val;
530 int ret;
531
532 mutex_lock(&di->cc_lock);
533
534 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
535 AB8500_RTC_CC_CONF_REG, &reg_val);
536 if (ret < 0)
537 goto fail;
538
539 if (!(reg_val & CC_PWR_UP_ENA)) {
540 dev_dbg(di->dev, "%s Enable FG\n", __func__);
541 di->turn_off_fg = true;
542
543 /* Program the samples */
544 ret = abx500_set_register_interruptible(di->dev,
545 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU,
546 SEC_TO_SAMPLE(10));
547 if (ret)
548 goto fail;
549
550 /* Start the CC */
551 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
552 AB8500_RTC_CC_CONF_REG,
553 (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA));
554 if (ret)
555 goto fail;
556 } else {
557 di->turn_off_fg = false;
558 }
559
560 /* Return and WFI */
561 INIT_COMPLETION(di->ab8500_fg_complete);
562 enable_irq(di->irq);
563
564 /* Note: cc_lock is still locked */
565 return 0;
566fail:
567 mutex_unlock(&di->cc_lock);
568 return ret;
569}
570
571/**
572 * ab8500_fg_inst_curr_done() - check if fg conversion is done
573 * @di: pointer to the ab8500_fg structure
574 *
575 * Returns 1 if conversion done, 0 if still waiting
576 */
577int ab8500_fg_inst_curr_done(struct ab8500_fg *di)
578{
579 return completion_done(&di->ab8500_fg_complete);
580}
581
582/**
583 * ab8500_fg_inst_curr_finalize() - battery instantaneous current
584 * @di: pointer to the ab8500_fg structure
585 * @res: battery instantenous current(on success)
586 *
587 * Returns 0 or an error code
588 * Note: This is part "two" and has to be called at earliest 250 ms
589 * after ab8500_fg_inst_curr_start()
590 */
591int ab8500_fg_inst_curr_finalize(struct ab8500_fg *di, int *res)
592{
593 u8 low, high;
594 int val;
595 int ret;
596 int timeout;
597
598 if (!completion_done(&di->ab8500_fg_complete)) {
599 timeout = wait_for_completion_timeout(&di->ab8500_fg_complete,
600 INS_CURR_TIMEOUT);
601 dev_dbg(di->dev, "Finalize time: %d ms\n",
602 ((INS_CURR_TIMEOUT - timeout) * 1000) / HZ);
603 if (!timeout) {
604 ret = -ETIME;
605 disable_irq(di->irq);
606 dev_err(di->dev, "completion timed out [%d]\n",
607 __LINE__);
608 goto fail;
609 }
610 }
611
612 disable_irq(di->irq);
613
614 ret = abx500_mask_and_set_register_interruptible(di->dev,
615 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
616 READ_REQ, READ_REQ);
617
618 /* 100uS between read request and read is needed */
619 usleep_range(100, 100);
620
621 /* Read CC Sample conversion value Low and high */
622 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
623 AB8500_GASG_CC_SMPL_CNVL_REG, &low);
624 if (ret < 0)
625 goto fail;
626
627 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
628 AB8500_GASG_CC_SMPL_CNVH_REG, &high);
629 if (ret < 0)
630 goto fail;
631
632 /*
633 * negative value for Discharging
634 * convert 2's compliment into decimal
635 */
636 if (high & 0x10)
637 val = (low | (high << 8) | 0xFFFFE000);
638 else
639 val = (low | (high << 8));
640
641 /*
642 * Convert to unit value in mA
643 * Full scale input voltage is
644 * 66.660mV => LSB = 66.660mV/(4096*res) = 1.627mA
645 * Given a 250ms conversion cycle time the LSB corresponds
646 * to 112.9 nAh. Convert to current by dividing by the conversion
647 * time in hours (250ms = 1 / (3600 * 4)h)
648 * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm
649 */
650 val = (val * QLSB_NANO_AMP_HOURS_X10 * 36 * 4) /
651 (1000 * di->bat->fg_res);
652
653 if (di->turn_off_fg) {
654 dev_dbg(di->dev, "%s Disable FG\n", __func__);
655
656 /* Clear any pending read requests */
657 ret = abx500_set_register_interruptible(di->dev,
658 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 0);
659 if (ret)
660 goto fail;
661
662 /* Stop the CC */
663 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
664 AB8500_RTC_CC_CONF_REG, 0);
665 if (ret)
666 goto fail;
667 }
668 mutex_unlock(&di->cc_lock);
669 (*res) = val;
670
671 return 0;
672fail:
673 mutex_unlock(&di->cc_lock);
674 return ret;
675}
676
677/**
678 * ab8500_fg_inst_curr_blocking() - battery instantaneous current
679 * @di: pointer to the ab8500_fg structure
680 * @res: battery instantenous current(on success)
681 *
682 * Returns 0 else error code
683 */
684int ab8500_fg_inst_curr_blocking(struct ab8500_fg *di)
685{
686 int ret;
687 int res = 0;
688
689 ret = ab8500_fg_inst_curr_start(di);
690 if (ret) {
691 dev_err(di->dev, "Failed to initialize fg_inst\n");
692 return 0;
693 }
694
695 ret = ab8500_fg_inst_curr_finalize(di, &res);
696 if (ret) {
697 dev_err(di->dev, "Failed to finalize fg_inst\n");
698 return 0;
699 }
700
701 return res;
702}
703
704/**
705 * ab8500_fg_acc_cur_work() - average battery current
706 * @work: pointer to the work_struct structure
707 *
708 * Updated the average battery current obtained from the
709 * coulomb counter.
710 */
711static void ab8500_fg_acc_cur_work(struct work_struct *work)
712{
713 int val;
714 int ret;
715 u8 low, med, high;
716
717 struct ab8500_fg *di = container_of(work,
718 struct ab8500_fg, fg_acc_cur_work);
719
720 mutex_lock(&di->cc_lock);
721 ret = abx500_set_register_interruptible(di->dev, AB8500_GAS_GAUGE,
722 AB8500_GASG_CC_NCOV_ACCU_CTRL, RD_NCONV_ACCU_REQ);
723 if (ret)
724 goto exit;
725
726 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
727 AB8500_GASG_CC_NCOV_ACCU_LOW, &low);
728 if (ret < 0)
729 goto exit;
730
731 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
732 AB8500_GASG_CC_NCOV_ACCU_MED, &med);
733 if (ret < 0)
734 goto exit;
735
736 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
737 AB8500_GASG_CC_NCOV_ACCU_HIGH, &high);
738 if (ret < 0)
739 goto exit;
740
741 /* Check for sign bit in case of negative value, 2's compliment */
742 if (high & 0x10)
743 val = (low | (med << 8) | (high << 16) | 0xFFE00000);
744 else
745 val = (low | (med << 8) | (high << 16));
746
747 /*
748 * Convert to uAh
749 * Given a 250ms conversion cycle time the LSB corresponds
750 * to 112.9 nAh.
751 * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm
752 */
753 di->accu_charge = (val * QLSB_NANO_AMP_HOURS_X10) /
754 (100 * di->bat->fg_res);
755
756 /*
757 * Convert to unit value in mA
758 * Full scale input voltage is
759 * 66.660mV => LSB = 66.660mV/(4096*res) = 1.627mA
760 * Given a 250ms conversion cycle time the LSB corresponds
761 * to 112.9 nAh. Convert to current by dividing by the conversion
762 * time in hours (= samples / (3600 * 4)h)
763 * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm
764 */
765 di->avg_curr = (val * QLSB_NANO_AMP_HOURS_X10 * 36) /
766 (1000 * di->bat->fg_res * (di->fg_samples / 4));
767
768 di->flags.conv_done = true;
769
770 mutex_unlock(&di->cc_lock);
771
772 queue_work(di->fg_wq, &di->fg_work);
773
774 return;
775exit:
776 dev_err(di->dev,
777 "Failed to read or write gas gauge registers\n");
778 mutex_unlock(&di->cc_lock);
779 queue_work(di->fg_wq, &di->fg_work);
780}
781
782/**
783 * ab8500_fg_bat_voltage() - get battery voltage
784 * @di: pointer to the ab8500_fg structure
785 *
786 * Returns battery voltage(on success) else error code
787 */
788static int ab8500_fg_bat_voltage(struct ab8500_fg *di)
789{
790 int vbat;
791 static int prev;
792
793 vbat = ab8500_gpadc_convert(di->gpadc, MAIN_BAT_V);
794 if (vbat < 0) {
795 dev_err(di->dev,
796 "%s gpadc conversion failed, using previous value\n",
797 __func__);
798 return prev;
799 }
800
801 prev = vbat;
802 return vbat;
803}
804
805/**
806 * ab8500_fg_volt_to_capacity() - Voltage based capacity
807 * @di: pointer to the ab8500_fg structure
808 * @voltage: The voltage to convert to a capacity
809 *
810 * Returns battery capacity in per mille based on voltage
811 */
812static int ab8500_fg_volt_to_capacity(struct ab8500_fg *di, int voltage)
813{
814 int i, tbl_size;
815 struct v_to_cap *tbl;
816 int cap = 0;
817
818 tbl = di->bat->bat_type[di->bat->batt_id].v_to_cap_tbl,
819 tbl_size = di->bat->bat_type[di->bat->batt_id].n_v_cap_tbl_elements;
820
821 for (i = 0; i < tbl_size; ++i) {
822 if (voltage > tbl[i].voltage)
823 break;
824 }
825
826 if ((i > 0) && (i < tbl_size)) {
827 cap = interpolate(voltage,
828 tbl[i].voltage,
829 tbl[i].capacity * 10,
830 tbl[i-1].voltage,
831 tbl[i-1].capacity * 10);
832 } else if (i == 0) {
833 cap = 1000;
834 } else {
835 cap = 0;
836 }
837
838 dev_dbg(di->dev, "%s Vbat: %d, Cap: %d per mille",
839 __func__, voltage, cap);
840
841 return cap;
842}
843
844/**
845 * ab8500_fg_uncomp_volt_to_capacity() - Uncompensated voltage based capacity
846 * @di: pointer to the ab8500_fg structure
847 *
848 * Returns battery capacity based on battery voltage that is not compensated
849 * for the voltage drop due to the load
850 */
851static int ab8500_fg_uncomp_volt_to_capacity(struct ab8500_fg *di)
852{
853 di->vbat = ab8500_fg_bat_voltage(di);
854 return ab8500_fg_volt_to_capacity(di, di->vbat);
855}
856
857/**
858 * ab8500_fg_battery_resistance() - Returns the battery inner resistance
859 * @di: pointer to the ab8500_fg structure
860 *
861 * Returns battery inner resistance added with the fuel gauge resistor value
862 * to get the total resistance in the whole link from gnd to bat+ node.
863 */
864static int ab8500_fg_battery_resistance(struct ab8500_fg *di)
865{
866 int i, tbl_size;
867 struct batres_vs_temp *tbl;
868 int resist = 0;
869
870 tbl = di->bat->bat_type[di->bat->batt_id].batres_tbl;
871 tbl_size = di->bat->bat_type[di->bat->batt_id].n_batres_tbl_elements;
872
873 for (i = 0; i < tbl_size; ++i) {
874 if (di->bat_temp / 10 > tbl[i].temp)
875 break;
876 }
877
878 if ((i > 0) && (i < tbl_size)) {
879 resist = interpolate(di->bat_temp / 10,
880 tbl[i].temp,
881 tbl[i].resist,
882 tbl[i-1].temp,
883 tbl[i-1].resist);
884 } else if (i == 0) {
885 resist = tbl[0].resist;
886 } else {
887 resist = tbl[tbl_size - 1].resist;
888 }
889
890 dev_dbg(di->dev, "%s Temp: %d battery internal resistance: %d"
891 " fg resistance %d, total: %d (mOhm)\n",
892 __func__, di->bat_temp, resist, di->bat->fg_res / 10,
893 (di->bat->fg_res / 10) + resist);
894
895 /* fg_res variable is in 0.1mOhm */
896 resist += di->bat->fg_res / 10;
897
898 return resist;
899}
900
901/**
902 * ab8500_fg_load_comp_volt_to_capacity() - Load compensated voltage based capacity
903 * @di: pointer to the ab8500_fg structure
904 *
905 * Returns battery capacity based on battery voltage that is load compensated
906 * for the voltage drop
907 */
908static int ab8500_fg_load_comp_volt_to_capacity(struct ab8500_fg *di)
909{
910 int vbat_comp, res;
911 int i = 0;
912 int vbat = 0;
913
914 ab8500_fg_inst_curr_start(di);
915
916 do {
917 vbat += ab8500_fg_bat_voltage(di);
918 i++;
919 msleep(5);
920 } while (!ab8500_fg_inst_curr_done(di));
921
922 ab8500_fg_inst_curr_finalize(di, &di->inst_curr);
923
924 di->vbat = vbat / i;
925 res = ab8500_fg_battery_resistance(di);
926
927 /* Use Ohms law to get the load compensated voltage */
928 vbat_comp = di->vbat - (di->inst_curr * res) / 1000;
929
930 dev_dbg(di->dev, "%s Measured Vbat: %dmV,Compensated Vbat %dmV, "
931 "R: %dmOhm, Current: %dmA Vbat Samples: %d\n",
932 __func__, di->vbat, vbat_comp, res, di->inst_curr, i);
933
934 return ab8500_fg_volt_to_capacity(di, vbat_comp);
935}
936
937/**
938 * ab8500_fg_convert_mah_to_permille() - Capacity in mAh to permille
939 * @di: pointer to the ab8500_fg structure
940 * @cap_mah: capacity in mAh
941 *
942 * Converts capacity in mAh to capacity in permille
943 */
944static int ab8500_fg_convert_mah_to_permille(struct ab8500_fg *di, int cap_mah)
945{
946 return (cap_mah * 1000) / di->bat_cap.max_mah_design;
947}
948
949/**
950 * ab8500_fg_convert_permille_to_mah() - Capacity in permille to mAh
951 * @di: pointer to the ab8500_fg structure
952 * @cap_pm: capacity in permille
953 *
954 * Converts capacity in permille to capacity in mAh
955 */
956static int ab8500_fg_convert_permille_to_mah(struct ab8500_fg *di, int cap_pm)
957{
958 return cap_pm * di->bat_cap.max_mah_design / 1000;
959}
960
961/**
962 * ab8500_fg_convert_mah_to_uwh() - Capacity in mAh to uWh
963 * @di: pointer to the ab8500_fg structure
964 * @cap_mah: capacity in mAh
965 *
966 * Converts capacity in mAh to capacity in uWh
967 */
968static int ab8500_fg_convert_mah_to_uwh(struct ab8500_fg *di, int cap_mah)
969{
970 u64 div_res;
971 u32 div_rem;
972
973 div_res = ((u64) cap_mah) * ((u64) di->vbat_nom);
974 div_rem = do_div(div_res, 1000);
975
976 /* Make sure to round upwards if necessary */
977 if (div_rem >= 1000 / 2)
978 div_res++;
979
980 return (int) div_res;
981}
982
983/**
984 * ab8500_fg_calc_cap_charging() - Calculate remaining capacity while charging
985 * @di: pointer to the ab8500_fg structure
986 *
987 * Return the capacity in mAh based on previous calculated capcity and the FG
988 * accumulator register value. The filter is filled with this capacity
989 */
990static int ab8500_fg_calc_cap_charging(struct ab8500_fg *di)
991{
992 dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n",
993 __func__,
994 di->bat_cap.mah,
995 di->accu_charge);
996
997 /* Capacity should not be less than 0 */
998 if (di->bat_cap.mah + di->accu_charge > 0)
999 di->bat_cap.mah += di->accu_charge;
1000 else
1001 di->bat_cap.mah = 0;
1002 /*
1003 * We force capacity to 100% once when the algorithm
1004 * reports that it's full.
1005 */
1006 if (di->bat_cap.mah >= di->bat_cap.max_mah_design ||
1007 di->flags.force_full) {
1008 di->bat_cap.mah = di->bat_cap.max_mah_design;
1009 }
1010
1011 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1012 di->bat_cap.permille =
1013 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1014
1015 /* We need to update battery voltage and inst current when charging */
1016 di->vbat = ab8500_fg_bat_voltage(di);
1017 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1018
1019 return di->bat_cap.mah;
1020}
1021
1022/**
1023 * ab8500_fg_calc_cap_discharge_voltage() - Capacity in discharge with voltage
1024 * @di: pointer to the ab8500_fg structure
1025 * @comp: if voltage should be load compensated before capacity calc
1026 *
1027 * Return the capacity in mAh based on the battery voltage. The voltage can
1028 * either be load compensated or not. This value is added to the filter and a
1029 * new mean value is calculated and returned.
1030 */
1031static int ab8500_fg_calc_cap_discharge_voltage(struct ab8500_fg *di, bool comp)
1032{
1033 int permille, mah;
1034
1035 if (comp)
1036 permille = ab8500_fg_load_comp_volt_to_capacity(di);
1037 else
1038 permille = ab8500_fg_uncomp_volt_to_capacity(di);
1039
1040 mah = ab8500_fg_convert_permille_to_mah(di, permille);
1041
1042 di->bat_cap.mah = ab8500_fg_add_cap_sample(di, mah);
1043 di->bat_cap.permille =
1044 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1045
1046 return di->bat_cap.mah;
1047}
1048
1049/**
1050 * ab8500_fg_calc_cap_discharge_fg() - Capacity in discharge with FG
1051 * @di: pointer to the ab8500_fg structure
1052 *
1053 * Return the capacity in mAh based on previous calculated capcity and the FG
1054 * accumulator register value. This value is added to the filter and a
1055 * new mean value is calculated and returned.
1056 */
1057static int ab8500_fg_calc_cap_discharge_fg(struct ab8500_fg *di)
1058{
1059 int permille_volt, permille;
1060
1061 dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n",
1062 __func__,
1063 di->bat_cap.mah,
1064 di->accu_charge);
1065
1066 /* Capacity should not be less than 0 */
1067 if (di->bat_cap.mah + di->accu_charge > 0)
1068 di->bat_cap.mah += di->accu_charge;
1069 else
1070 di->bat_cap.mah = 0;
1071
1072 if (di->bat_cap.mah >= di->bat_cap.max_mah_design)
1073 di->bat_cap.mah = di->bat_cap.max_mah_design;
1074
1075 /*
1076 * Check against voltage based capacity. It can not be lower
1077 * than what the uncompensated voltage says
1078 */
1079 permille = ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1080 permille_volt = ab8500_fg_uncomp_volt_to_capacity(di);
1081
1082 if (permille < permille_volt) {
1083 di->bat_cap.permille = permille_volt;
1084 di->bat_cap.mah = ab8500_fg_convert_permille_to_mah(di,
1085 di->bat_cap.permille);
1086
1087 dev_dbg(di->dev, "%s voltage based: perm %d perm_volt %d\n",
1088 __func__,
1089 permille,
1090 permille_volt);
1091
1092 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1093 } else {
1094 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1095 di->bat_cap.permille =
1096 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1097 }
1098
1099 return di->bat_cap.mah;
1100}
1101
1102/**
1103 * ab8500_fg_capacity_level() - Get the battery capacity level
1104 * @di: pointer to the ab8500_fg structure
1105 *
1106 * Get the battery capacity level based on the capacity in percent
1107 */
1108static int ab8500_fg_capacity_level(struct ab8500_fg *di)
1109{
1110 int ret, percent;
1111
1112 percent = di->bat_cap.permille / 10;
1113
1114 if (percent <= di->bat->cap_levels->critical ||
1115 di->flags.low_bat)
1116 ret = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
1117 else if (percent <= di->bat->cap_levels->low)
1118 ret = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
1119 else if (percent <= di->bat->cap_levels->normal)
1120 ret = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
1121 else if (percent <= di->bat->cap_levels->high)
1122 ret = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
1123 else
1124 ret = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
1125
1126 return ret;
1127}
1128
1129/**
1130 * ab8500_fg_check_capacity_limits() - Check if capacity has changed
1131 * @di: pointer to the ab8500_fg structure
1132 * @init: capacity is allowed to go up in init mode
1133 *
1134 * Check if capacity or capacity limit has changed and notify the system
1135 * about it using the power_supply framework
1136 */
1137static void ab8500_fg_check_capacity_limits(struct ab8500_fg *di, bool init)
1138{
1139 bool changed = false;
1140
1141 di->bat_cap.level = ab8500_fg_capacity_level(di);
1142
1143 if (di->bat_cap.level != di->bat_cap.prev_level) {
1144 /*
1145 * We do not allow reported capacity level to go up
1146 * unless we're charging or if we're in init
1147 */
1148 if (!(!di->flags.charging && di->bat_cap.level >
1149 di->bat_cap.prev_level) || init) {
1150 dev_dbg(di->dev, "level changed from %d to %d\n",
1151 di->bat_cap.prev_level,
1152 di->bat_cap.level);
1153 di->bat_cap.prev_level = di->bat_cap.level;
1154 changed = true;
1155 } else {
1156 dev_dbg(di->dev, "level not allowed to go up "
1157 "since no charger is connected: %d to %d\n",
1158 di->bat_cap.prev_level,
1159 di->bat_cap.level);
1160 }
1161 }
1162
1163 /*
1164 * If we have received the LOW_BAT IRQ, set capacity to 0 to initiate
1165 * shutdown
1166 */
1167 if (di->flags.low_bat) {
1168 dev_dbg(di->dev, "Battery low, set capacity to 0\n");
1169 di->bat_cap.prev_percent = 0;
1170 di->bat_cap.permille = 0;
1171 di->bat_cap.prev_mah = 0;
1172 di->bat_cap.mah = 0;
1173 changed = true;
1174 } else if (di->flags.fully_charged) {
1175 /*
1176 * We report 100% if algorithm reported fully charged
1177 * unless capacity drops too much
1178 */
1179 if (di->flags.force_full) {
1180 di->bat_cap.prev_percent = di->bat_cap.permille / 10;
1181 di->bat_cap.prev_mah = di->bat_cap.mah;
1182 } else if (!di->flags.force_full &&
1183 di->bat_cap.prev_percent !=
1184 (di->bat_cap.permille) / 10 &&
1185 (di->bat_cap.permille / 10) <
1186 di->bat->fg_params->maint_thres) {
1187 dev_dbg(di->dev,
1188 "battery reported full "
1189 "but capacity dropping: %d\n",
1190 di->bat_cap.permille / 10);
1191 di->bat_cap.prev_percent = di->bat_cap.permille / 10;
1192 di->bat_cap.prev_mah = di->bat_cap.mah;
1193
1194 changed = true;
1195 }
1196 } else if (di->bat_cap.prev_percent != di->bat_cap.permille / 10) {
1197 if (di->bat_cap.permille / 10 == 0) {
1198 /*
1199 * We will not report 0% unless we've got
1200 * the LOW_BAT IRQ, no matter what the FG
1201 * algorithm says.
1202 */
1203 di->bat_cap.prev_percent = 1;
1204 di->bat_cap.permille = 1;
1205 di->bat_cap.prev_mah = 1;
1206 di->bat_cap.mah = 1;
1207
1208 changed = true;
1209 } else if (!(!di->flags.charging &&
1210 (di->bat_cap.permille / 10) >
1211 di->bat_cap.prev_percent) || init) {
1212 /*
1213 * We do not allow reported capacity to go up
1214 * unless we're charging or if we're in init
1215 */
1216 dev_dbg(di->dev,
1217 "capacity changed from %d to %d (%d)\n",
1218 di->bat_cap.prev_percent,
1219 di->bat_cap.permille / 10,
1220 di->bat_cap.permille);
1221 di->bat_cap.prev_percent = di->bat_cap.permille / 10;
1222 di->bat_cap.prev_mah = di->bat_cap.mah;
1223
1224 changed = true;
1225 } else {
1226 dev_dbg(di->dev, "capacity not allowed to go up since "
1227 "no charger is connected: %d to %d (%d)\n",
1228 di->bat_cap.prev_percent,
1229 di->bat_cap.permille / 10,
1230 di->bat_cap.permille);
1231 }
1232 }
1233
1234 if (changed) {
1235 power_supply_changed(&di->fg_psy);
1236 if (di->flags.fully_charged && di->flags.force_full) {
1237 dev_dbg(di->dev, "Battery full, notifying.\n");
1238 di->flags.force_full = false;
1239 sysfs_notify(&di->fg_kobject, NULL, "charge_full");
1240 }
1241 sysfs_notify(&di->fg_kobject, NULL, "charge_now");
1242 }
1243}
1244
1245static void ab8500_fg_charge_state_to(struct ab8500_fg *di,
1246 enum ab8500_fg_charge_state new_state)
1247{
1248 dev_dbg(di->dev, "Charge state from %d [%s] to %d [%s]\n",
1249 di->charge_state,
1250 charge_state[di->charge_state],
1251 new_state,
1252 charge_state[new_state]);
1253
1254 di->charge_state = new_state;
1255}
1256
1257static void ab8500_fg_discharge_state_to(struct ab8500_fg *di,
1258 enum ab8500_fg_charge_state new_state)
1259{
1260 dev_dbg(di->dev, "Disharge state from %d [%s] to %d [%s]\n",
1261 di->discharge_state,
1262 discharge_state[di->discharge_state],
1263 new_state,
1264 discharge_state[new_state]);
1265
1266 di->discharge_state = new_state;
1267}
1268
1269/**
1270 * ab8500_fg_algorithm_charging() - FG algorithm for when charging
1271 * @di: pointer to the ab8500_fg structure
1272 *
1273 * Battery capacity calculation state machine for when we're charging
1274 */
1275static void ab8500_fg_algorithm_charging(struct ab8500_fg *di)
1276{
1277 /*
1278 * If we change to discharge mode
1279 * we should start with recovery
1280 */
1281 if (di->discharge_state != AB8500_FG_DISCHARGE_INIT_RECOVERY)
1282 ab8500_fg_discharge_state_to(di,
1283 AB8500_FG_DISCHARGE_INIT_RECOVERY);
1284
1285 switch (di->charge_state) {
1286 case AB8500_FG_CHARGE_INIT:
1287 di->fg_samples = SEC_TO_SAMPLE(
1288 di->bat->fg_params->accu_charging);
1289
1290 ab8500_fg_coulomb_counter(di, true);
1291 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_READOUT);
1292
1293 break;
1294
1295 case AB8500_FG_CHARGE_READOUT:
1296 /*
1297 * Read the FG and calculate the new capacity
1298 */
1299 mutex_lock(&di->cc_lock);
1300 if (!di->flags.conv_done) {
1301 /* Wasn't the CC IRQ that got us here */
1302 mutex_unlock(&di->cc_lock);
1303 dev_dbg(di->dev, "%s CC conv not done\n",
1304 __func__);
1305
1306 break;
1307 }
1308 di->flags.conv_done = false;
1309 mutex_unlock(&di->cc_lock);
1310
1311 ab8500_fg_calc_cap_charging(di);
1312
1313 break;
1314
1315 default:
1316 break;
1317 }
1318
1319 /* Check capacity limits */
1320 ab8500_fg_check_capacity_limits(di, false);
1321}
1322
1323static void force_capacity(struct ab8500_fg *di)
1324{
1325 int cap;
1326
1327 ab8500_fg_clear_cap_samples(di);
1328 cap = di->bat_cap.user_mah;
1329 if (cap > di->bat_cap.max_mah_design) {
1330 dev_dbg(di->dev, "Remaining cap %d can't be bigger than total"
1331 " %d\n", cap, di->bat_cap.max_mah_design);
1332 cap = di->bat_cap.max_mah_design;
1333 }
1334 ab8500_fg_fill_cap_sample(di, di->bat_cap.user_mah);
1335 di->bat_cap.permille = ab8500_fg_convert_mah_to_permille(di, cap);
1336 di->bat_cap.mah = cap;
1337 ab8500_fg_check_capacity_limits(di, true);
1338}
1339
1340static bool check_sysfs_capacity(struct ab8500_fg *di)
1341{
1342 int cap, lower, upper;
1343 int cap_permille;
1344
1345 cap = di->bat_cap.user_mah;
1346
1347 cap_permille = ab8500_fg_convert_mah_to_permille(di,
1348 di->bat_cap.user_mah);
1349
1350 lower = di->bat_cap.permille - di->bat->fg_params->user_cap_limit * 10;
1351 upper = di->bat_cap.permille + di->bat->fg_params->user_cap_limit * 10;
1352
1353 if (lower < 0)
1354 lower = 0;
1355 /* 1000 is permille, -> 100 percent */
1356 if (upper > 1000)
1357 upper = 1000;
1358
1359 dev_dbg(di->dev, "Capacity limits:"
1360 " (Lower: %d User: %d Upper: %d) [user: %d, was: %d]\n",
1361 lower, cap_permille, upper, cap, di->bat_cap.mah);
1362
1363 /* If within limits, use the saved capacity and exit estimation...*/
1364 if (cap_permille > lower && cap_permille < upper) {
1365 dev_dbg(di->dev, "OK! Using users cap %d uAh now\n", cap);
1366 force_capacity(di);
1367 return true;
1368 }
1369 dev_dbg(di->dev, "Capacity from user out of limits, ignoring");
1370 return false;
1371}
1372
1373/**
1374 * ab8500_fg_algorithm_discharging() - FG algorithm for when discharging
1375 * @di: pointer to the ab8500_fg structure
1376 *
1377 * Battery capacity calculation state machine for when we're discharging
1378 */
1379static void ab8500_fg_algorithm_discharging(struct ab8500_fg *di)
1380{
1381 int sleep_time;
1382
1383 /* If we change to charge mode we should start with init */
1384 if (di->charge_state != AB8500_FG_CHARGE_INIT)
1385 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
1386
1387 switch (di->discharge_state) {
1388 case AB8500_FG_DISCHARGE_INIT:
1389 /* We use the FG IRQ to work on */
1390 di->init_cnt = 0;
1391 di->fg_samples = SEC_TO_SAMPLE(di->bat->fg_params->init_timer);
1392 ab8500_fg_coulomb_counter(di, true);
1393 ab8500_fg_discharge_state_to(di,
1394 AB8500_FG_DISCHARGE_INITMEASURING);
1395
1396 /* Intentional fallthrough */
1397 case AB8500_FG_DISCHARGE_INITMEASURING:
1398 /*
1399 * Discard a number of samples during startup.
1400 * After that, use compensated voltage for a few
1401 * samples to get an initial capacity.
1402 * Then go to READOUT
1403 */
1404 sleep_time = di->bat->fg_params->init_timer;
1405
1406 /* Discard the first [x] seconds */
1407 if (di->init_cnt >
1408 di->bat->fg_params->init_discard_time) {
1409 ab8500_fg_calc_cap_discharge_voltage(di, true);
1410
1411 ab8500_fg_check_capacity_limits(di, true);
1412 }
1413
1414 di->init_cnt += sleep_time;
1415 if (di->init_cnt > di->bat->fg_params->init_total_time)
1416 ab8500_fg_discharge_state_to(di,
1417 AB8500_FG_DISCHARGE_READOUT_INIT);
1418
1419 break;
1420
1421 case AB8500_FG_DISCHARGE_INIT_RECOVERY:
1422 di->recovery_cnt = 0;
1423 di->recovery_needed = true;
1424 ab8500_fg_discharge_state_to(di,
1425 AB8500_FG_DISCHARGE_RECOVERY);
1426
1427 /* Intentional fallthrough */
1428
1429 case AB8500_FG_DISCHARGE_RECOVERY:
1430 sleep_time = di->bat->fg_params->recovery_sleep_timer;
1431
1432 /*
1433 * We should check the power consumption
1434 * If low, go to READOUT (after x min) or
1435 * RECOVERY_SLEEP if time left.
1436 * If high, go to READOUT
1437 */
1438 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1439
1440 if (ab8500_fg_is_low_curr(di, di->inst_curr)) {
1441 if (di->recovery_cnt >
1442 di->bat->fg_params->recovery_total_time) {
1443 di->fg_samples = SEC_TO_SAMPLE(
1444 di->bat->fg_params->accu_high_curr);
1445 ab8500_fg_coulomb_counter(di, true);
1446 ab8500_fg_discharge_state_to(di,
1447 AB8500_FG_DISCHARGE_READOUT);
1448 di->recovery_needed = false;
1449 } else {
1450 queue_delayed_work(di->fg_wq,
1451 &di->fg_periodic_work,
1452 sleep_time * HZ);
1453 }
1454 di->recovery_cnt += sleep_time;
1455 } else {
1456 di->fg_samples = SEC_TO_SAMPLE(
1457 di->bat->fg_params->accu_high_curr);
1458 ab8500_fg_coulomb_counter(di, true);
1459 ab8500_fg_discharge_state_to(di,
1460 AB8500_FG_DISCHARGE_READOUT);
1461 }
1462 break;
1463
1464 case AB8500_FG_DISCHARGE_READOUT_INIT:
1465 di->fg_samples = SEC_TO_SAMPLE(
1466 di->bat->fg_params->accu_high_curr);
1467 ab8500_fg_coulomb_counter(di, true);
1468 ab8500_fg_discharge_state_to(di,
1469 AB8500_FG_DISCHARGE_READOUT);
1470 break;
1471
1472 case AB8500_FG_DISCHARGE_READOUT:
1473 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1474
1475 if (ab8500_fg_is_low_curr(di, di->inst_curr)) {
1476 /* Detect mode change */
1477 if (di->high_curr_mode) {
1478 di->high_curr_mode = false;
1479 di->high_curr_cnt = 0;
1480 }
1481
1482 if (di->recovery_needed) {
1483 ab8500_fg_discharge_state_to(di,
1484 AB8500_FG_DISCHARGE_RECOVERY);
1485
1486 queue_delayed_work(di->fg_wq,
1487 &di->fg_periodic_work, 0);
1488
1489 break;
1490 }
1491
1492 ab8500_fg_calc_cap_discharge_voltage(di, true);
1493 } else {
1494 mutex_lock(&di->cc_lock);
1495 if (!di->flags.conv_done) {
1496 /* Wasn't the CC IRQ that got us here */
1497 mutex_unlock(&di->cc_lock);
1498 dev_dbg(di->dev, "%s CC conv not done\n",
1499 __func__);
1500
1501 break;
1502 }
1503 di->flags.conv_done = false;
1504 mutex_unlock(&di->cc_lock);
1505
1506 /* Detect mode change */
1507 if (!di->high_curr_mode) {
1508 di->high_curr_mode = true;
1509 di->high_curr_cnt = 0;
1510 }
1511
1512 di->high_curr_cnt +=
1513 di->bat->fg_params->accu_high_curr;
1514 if (di->high_curr_cnt >
1515 di->bat->fg_params->high_curr_time)
1516 di->recovery_needed = true;
1517
1518 ab8500_fg_calc_cap_discharge_fg(di);
1519 }
1520
1521 ab8500_fg_check_capacity_limits(di, false);
1522
1523 break;
1524
1525 case AB8500_FG_DISCHARGE_WAKEUP:
1526 ab8500_fg_coulomb_counter(di, true);
1527 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1528
1529 ab8500_fg_calc_cap_discharge_voltage(di, true);
1530
1531 di->fg_samples = SEC_TO_SAMPLE(
1532 di->bat->fg_params->accu_high_curr);
1533 ab8500_fg_coulomb_counter(di, true);
1534 ab8500_fg_discharge_state_to(di,
1535 AB8500_FG_DISCHARGE_READOUT);
1536
1537 ab8500_fg_check_capacity_limits(di, false);
1538
1539 break;
1540
1541 default:
1542 break;
1543 }
1544}
1545
1546/**
1547 * ab8500_fg_algorithm_calibrate() - Internal columb counter offset calibration
1548 * @di: pointer to the ab8500_fg structure
1549 *
1550 */
1551static void ab8500_fg_algorithm_calibrate(struct ab8500_fg *di)
1552{
1553 int ret;
1554
1555 switch (di->calib_state) {
1556 case AB8500_FG_CALIB_INIT:
1557 dev_dbg(di->dev, "Calibration ongoing...\n");
1558
1559 ret = abx500_mask_and_set_register_interruptible(di->dev,
1560 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1561 CC_INT_CAL_N_AVG_MASK, CC_INT_CAL_SAMPLES_8);
1562 if (ret < 0)
1563 goto err;
1564
1565 ret = abx500_mask_and_set_register_interruptible(di->dev,
1566 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1567 CC_INTAVGOFFSET_ENA, CC_INTAVGOFFSET_ENA);
1568 if (ret < 0)
1569 goto err;
1570 di->calib_state = AB8500_FG_CALIB_WAIT;
1571 break;
1572 case AB8500_FG_CALIB_END:
1573 ret = abx500_mask_and_set_register_interruptible(di->dev,
1574 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1575 CC_MUXOFFSET, CC_MUXOFFSET);
1576 if (ret < 0)
1577 goto err;
1578 di->flags.calibrate = false;
1579 dev_dbg(di->dev, "Calibration done...\n");
1580 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1581 break;
1582 case AB8500_FG_CALIB_WAIT:
1583 dev_dbg(di->dev, "Calibration WFI\n");
1584 default:
1585 break;
1586 }
1587 return;
1588err:
1589 /* Something went wrong, don't calibrate then */
1590 dev_err(di->dev, "failed to calibrate the CC\n");
1591 di->flags.calibrate = false;
1592 di->calib_state = AB8500_FG_CALIB_INIT;
1593 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1594}
1595
1596/**
1597 * ab8500_fg_algorithm() - Entry point for the FG algorithm
1598 * @di: pointer to the ab8500_fg structure
1599 *
1600 * Entry point for the battery capacity calculation state machine
1601 */
1602static void ab8500_fg_algorithm(struct ab8500_fg *di)
1603{
1604 if (di->flags.calibrate)
1605 ab8500_fg_algorithm_calibrate(di);
1606 else {
1607 if (di->flags.charging)
1608 ab8500_fg_algorithm_charging(di);
1609 else
1610 ab8500_fg_algorithm_discharging(di);
1611 }
1612
1613 dev_dbg(di->dev, "[FG_DATA] %d %d %d %d %d %d %d %d %d "
1614 "%d %d %d %d %d %d %d\n",
1615 di->bat_cap.max_mah_design,
1616 di->bat_cap.mah,
1617 di->bat_cap.permille,
1618 di->bat_cap.level,
1619 di->bat_cap.prev_mah,
1620 di->bat_cap.prev_percent,
1621 di->bat_cap.prev_level,
1622 di->vbat,
1623 di->inst_curr,
1624 di->avg_curr,
1625 di->accu_charge,
1626 di->flags.charging,
1627 di->charge_state,
1628 di->discharge_state,
1629 di->high_curr_mode,
1630 di->recovery_needed);
1631}
1632
1633/**
1634 * ab8500_fg_periodic_work() - Run the FG state machine periodically
1635 * @work: pointer to the work_struct structure
1636 *
1637 * Work queue function for periodic work
1638 */
1639static void ab8500_fg_periodic_work(struct work_struct *work)
1640{
1641 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1642 fg_periodic_work.work);
1643
1644 if (di->init_capacity) {
1645 /* A dummy read that will return 0 */
1646 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1647 /* Get an initial capacity calculation */
1648 ab8500_fg_calc_cap_discharge_voltage(di, true);
1649 ab8500_fg_check_capacity_limits(di, true);
1650 di->init_capacity = false;
1651
1652 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1653 } else if (di->flags.user_cap) {
1654 if (check_sysfs_capacity(di)) {
1655 ab8500_fg_check_capacity_limits(di, true);
1656 if (di->flags.charging)
1657 ab8500_fg_charge_state_to(di,
1658 AB8500_FG_CHARGE_INIT);
1659 else
1660 ab8500_fg_discharge_state_to(di,
1661 AB8500_FG_DISCHARGE_READOUT_INIT);
1662 }
1663 di->flags.user_cap = false;
1664 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1665 } else
1666 ab8500_fg_algorithm(di);
1667
1668}
1669
1670/**
1671 * ab8500_fg_check_hw_failure_work() - Check OVV_BAT condition
1672 * @work: pointer to the work_struct structure
1673 *
1674 * Work queue function for checking the OVV_BAT condition
1675 */
1676static void ab8500_fg_check_hw_failure_work(struct work_struct *work)
1677{
1678 int ret;
1679 u8 reg_value;
1680
1681 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1682 fg_check_hw_failure_work.work);
1683
1684 /*
1685 * If we have had a battery over-voltage situation,
1686 * check ovv-bit to see if it should be reset.
1687 */
1688 if (di->flags.bat_ovv) {
1689 ret = abx500_get_register_interruptible(di->dev,
1690 AB8500_CHARGER, AB8500_CH_STAT_REG,
1691 &reg_value);
1692 if (ret < 0) {
1693 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1694 return;
1695 }
1696 if ((reg_value & BATT_OVV) != BATT_OVV) {
1697 dev_dbg(di->dev, "Battery recovered from OVV\n");
1698 di->flags.bat_ovv = false;
1699 power_supply_changed(&di->fg_psy);
1700 return;
1701 }
1702
1703 /* Not yet recovered from ovv, reschedule this test */
1704 queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work,
1705 round_jiffies(HZ));
1706 }
1707}
1708
1709/**
1710 * ab8500_fg_low_bat_work() - Check LOW_BAT condition
1711 * @work: pointer to the work_struct structure
1712 *
1713 * Work queue function for checking the LOW_BAT condition
1714 */
1715static void ab8500_fg_low_bat_work(struct work_struct *work)
1716{
1717 int vbat;
1718
1719 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1720 fg_low_bat_work.work);
1721
1722 vbat = ab8500_fg_bat_voltage(di);
1723
1724 /* Check if LOW_BAT still fulfilled */
1725 if (vbat < di->bat->fg_params->lowbat_threshold) {
1726 di->flags.low_bat = true;
1727 dev_warn(di->dev, "Battery voltage still LOW\n");
1728
1729 /*
1730 * We need to re-schedule this check to be able to detect
1731 * if the voltage increases again during charging
1732 */
1733 queue_delayed_work(di->fg_wq, &di->fg_low_bat_work,
1734 round_jiffies(LOW_BAT_CHECK_INTERVAL));
1735 } else {
1736 di->flags.low_bat = false;
1737 dev_warn(di->dev, "Battery voltage OK again\n");
1738 }
1739
1740 /* This is needed to dispatch LOW_BAT */
1741 ab8500_fg_check_capacity_limits(di, false);
1742
1743 /* Set this flag to check if LOW_BAT IRQ still occurs */
1744 di->flags.low_bat_delay = false;
1745}
1746
1747/**
1748 * ab8500_fg_battok_calc - calculate the bit pattern corresponding
1749 * to the target voltage.
1750 * @di: pointer to the ab8500_fg structure
1751 * @target target voltage
1752 *
1753 * Returns bit pattern closest to the target voltage
1754 * valid return values are 0-14. (0-BATT_OK_MAX_NR_INCREMENTS)
1755 */
1756
1757static int ab8500_fg_battok_calc(struct ab8500_fg *di, int target)
1758{
1759 if (target > BATT_OK_MIN +
1760 (BATT_OK_INCREMENT * BATT_OK_MAX_NR_INCREMENTS))
1761 return BATT_OK_MAX_NR_INCREMENTS;
1762 if (target < BATT_OK_MIN)
1763 return 0;
1764 return (target - BATT_OK_MIN) / BATT_OK_INCREMENT;
1765}
1766
1767/**
1768 * ab8500_fg_battok_init_hw_register - init battok levels
1769 * @di: pointer to the ab8500_fg structure
1770 *
1771 */
1772
1773static int ab8500_fg_battok_init_hw_register(struct ab8500_fg *di)
1774{
1775 int selected;
1776 int sel0;
1777 int sel1;
1778 int cbp_sel0;
1779 int cbp_sel1;
1780 int ret;
1781 int new_val;
1782
1783 sel0 = di->bat->fg_params->battok_falling_th_sel0;
1784 sel1 = di->bat->fg_params->battok_raising_th_sel1;
1785
1786 cbp_sel0 = ab8500_fg_battok_calc(di, sel0);
1787 cbp_sel1 = ab8500_fg_battok_calc(di, sel1);
1788
1789 selected = BATT_OK_MIN + cbp_sel0 * BATT_OK_INCREMENT;
1790
1791 if (selected != sel0)
1792 dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n",
1793 sel0, selected, cbp_sel0);
1794
1795 selected = BATT_OK_MIN + cbp_sel1 * BATT_OK_INCREMENT;
1796
1797 if (selected != sel1)
1798 dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n",
1799 sel1, selected, cbp_sel1);
1800
1801 new_val = cbp_sel0 | (cbp_sel1 << 4);
1802
1803 dev_dbg(di->dev, "using: %x %d %d\n", new_val, cbp_sel0, cbp_sel1);
1804 ret = abx500_set_register_interruptible(di->dev, AB8500_SYS_CTRL2_BLOCK,
1805 AB8500_BATT_OK_REG, new_val);
1806 return ret;
1807}
1808
1809/**
1810 * ab8500_fg_instant_work() - Run the FG state machine instantly
1811 * @work: pointer to the work_struct structure
1812 *
1813 * Work queue function for instant work
1814 */
1815static void ab8500_fg_instant_work(struct work_struct *work)
1816{
1817 struct ab8500_fg *di = container_of(work, struct ab8500_fg, fg_work);
1818
1819 ab8500_fg_algorithm(di);
1820}
1821
1822/**
1823 * ab8500_fg_cc_data_end_handler() - isr to get battery avg current.
1824 * @irq: interrupt number
1825 * @_di: pointer to the ab8500_fg structure
1826 *
1827 * Returns IRQ status(IRQ_HANDLED)
1828 */
1829static irqreturn_t ab8500_fg_cc_data_end_handler(int irq, void *_di)
1830{
1831 struct ab8500_fg *di = _di;
1832 complete(&di->ab8500_fg_complete);
1833 return IRQ_HANDLED;
1834}
1835
1836/**
1837 * ab8500_fg_cc_convend_handler() - isr to get battery avg current.
1838 * @irq: interrupt number
1839 * @_di: pointer to the ab8500_fg structure
1840 *
1841 * Returns IRQ status(IRQ_HANDLED)
1842 */
1843static irqreturn_t ab8500_fg_cc_int_calib_handler(int irq, void *_di)
1844{
1845 struct ab8500_fg *di = _di;
1846 di->calib_state = AB8500_FG_CALIB_END;
1847 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1848 return IRQ_HANDLED;
1849}
1850
1851/**
1852 * ab8500_fg_cc_convend_handler() - isr to get battery avg current.
1853 * @irq: interrupt number
1854 * @_di: pointer to the ab8500_fg structure
1855 *
1856 * Returns IRQ status(IRQ_HANDLED)
1857 */
1858static irqreturn_t ab8500_fg_cc_convend_handler(int irq, void *_di)
1859{
1860 struct ab8500_fg *di = _di;
1861
1862 queue_work(di->fg_wq, &di->fg_acc_cur_work);
1863
1864 return IRQ_HANDLED;
1865}
1866
1867/**
1868 * ab8500_fg_batt_ovv_handler() - Battery OVV occured
1869 * @irq: interrupt number
1870 * @_di: pointer to the ab8500_fg structure
1871 *
1872 * Returns IRQ status(IRQ_HANDLED)
1873 */
1874static irqreturn_t ab8500_fg_batt_ovv_handler(int irq, void *_di)
1875{
1876 struct ab8500_fg *di = _di;
1877
1878 dev_dbg(di->dev, "Battery OVV\n");
1879 di->flags.bat_ovv = true;
1880 power_supply_changed(&di->fg_psy);
1881
1882 /* Schedule a new HW failure check */
1883 queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work, 0);
1884
1885 return IRQ_HANDLED;
1886}
1887
1888/**
1889 * ab8500_fg_lowbatf_handler() - Battery voltage is below LOW threshold
1890 * @irq: interrupt number
1891 * @_di: pointer to the ab8500_fg structure
1892 *
1893 * Returns IRQ status(IRQ_HANDLED)
1894 */
1895static irqreturn_t ab8500_fg_lowbatf_handler(int irq, void *_di)
1896{
1897 struct ab8500_fg *di = _di;
1898
1899 if (!di->flags.low_bat_delay) {
1900 dev_warn(di->dev, "Battery voltage is below LOW threshold\n");
1901 di->flags.low_bat_delay = true;
1902 /*
1903 * Start a timer to check LOW_BAT again after some time
1904 * This is done to avoid shutdown on single voltage dips
1905 */
1906 queue_delayed_work(di->fg_wq, &di->fg_low_bat_work,
1907 round_jiffies(LOW_BAT_CHECK_INTERVAL));
1908 }
1909 return IRQ_HANDLED;
1910}
1911
1912/**
1913 * ab8500_fg_get_property() - get the fg properties
1914 * @psy: pointer to the power_supply structure
1915 * @psp: pointer to the power_supply_property structure
1916 * @val: pointer to the power_supply_propval union
1917 *
1918 * This function gets called when an application tries to get the
1919 * fg properties by reading the sysfs files.
1920 * voltage_now: battery voltage
1921 * current_now: battery instant current
1922 * current_avg: battery average current
1923 * charge_full_design: capacity where battery is considered full
1924 * charge_now: battery capacity in nAh
1925 * capacity: capacity in percent
1926 * capacity_level: capacity level
1927 *
1928 * Returns error code in case of failure else 0 on success
1929 */
1930static int ab8500_fg_get_property(struct power_supply *psy,
1931 enum power_supply_property psp,
1932 union power_supply_propval *val)
1933{
1934 struct ab8500_fg *di;
1935
1936 di = to_ab8500_fg_device_info(psy);
1937
1938 /*
1939 * If battery is identified as unknown and charging of unknown
1940 * batteries is disabled, we always report 100% capacity and
1941 * capacity level UNKNOWN, since we can't calculate
1942 * remaining capacity
1943 */
1944
1945 switch (psp) {
1946 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1947 if (di->flags.bat_ovv)
1948 val->intval = BATT_OVV_VALUE * 1000;
1949 else
1950 val->intval = di->vbat * 1000;
1951 break;
1952 case POWER_SUPPLY_PROP_CURRENT_NOW:
1953 val->intval = di->inst_curr * 1000;
1954 break;
1955 case POWER_SUPPLY_PROP_CURRENT_AVG:
1956 val->intval = di->avg_curr * 1000;
1957 break;
1958 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
1959 val->intval = ab8500_fg_convert_mah_to_uwh(di,
1960 di->bat_cap.max_mah_design);
1961 break;
1962 case POWER_SUPPLY_PROP_ENERGY_FULL:
1963 val->intval = ab8500_fg_convert_mah_to_uwh(di,
1964 di->bat_cap.max_mah);
1965 break;
1966 case POWER_SUPPLY_PROP_ENERGY_NOW:
1967 if (di->flags.batt_unknown && !di->bat->chg_unknown_bat &&
1968 di->flags.batt_id_received)
1969 val->intval = ab8500_fg_convert_mah_to_uwh(di,
1970 di->bat_cap.max_mah);
1971 else
1972 val->intval = ab8500_fg_convert_mah_to_uwh(di,
1973 di->bat_cap.prev_mah);
1974 break;
1975 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
1976 val->intval = di->bat_cap.max_mah_design;
1977 break;
1978 case POWER_SUPPLY_PROP_CHARGE_FULL:
1979 val->intval = di->bat_cap.max_mah;
1980 break;
1981 case POWER_SUPPLY_PROP_CHARGE_NOW:
1982 if (di->flags.batt_unknown && !di->bat->chg_unknown_bat &&
1983 di->flags.batt_id_received)
1984 val->intval = di->bat_cap.max_mah;
1985 else
1986 val->intval = di->bat_cap.prev_mah;
1987 break;
1988 case POWER_SUPPLY_PROP_CAPACITY:
1989 if (di->flags.batt_unknown && !di->bat->chg_unknown_bat &&
1990 di->flags.batt_id_received)
1991 val->intval = 100;
1992 else
1993 val->intval = di->bat_cap.prev_percent;
1994 break;
1995 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
1996 if (di->flags.batt_unknown && !di->bat->chg_unknown_bat &&
1997 di->flags.batt_id_received)
1998 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
1999 else
2000 val->intval = di->bat_cap.prev_level;
2001 break;
2002 default:
2003 return -EINVAL;
2004 }
2005 return 0;
2006}
2007
2008static int ab8500_fg_get_ext_psy_data(struct device *dev, void *data)
2009{
2010 struct power_supply *psy;
2011 struct power_supply *ext;
2012 struct ab8500_fg *di;
2013 union power_supply_propval ret;
2014 int i, j;
2015 bool psy_found = false;
2016
2017 psy = (struct power_supply *)data;
2018 ext = dev_get_drvdata(dev);
2019 di = to_ab8500_fg_device_info(psy);
2020
2021 /*
2022 * For all psy where the name of your driver
2023 * appears in any supplied_to
2024 */
2025 for (i = 0; i < ext->num_supplicants; i++) {
2026 if (!strcmp(ext->supplied_to[i], psy->name))
2027 psy_found = true;
2028 }
2029
2030 if (!psy_found)
2031 return 0;
2032
2033 /* Go through all properties for the psy */
2034 for (j = 0; j < ext->num_properties; j++) {
2035 enum power_supply_property prop;
2036 prop = ext->properties[j];
2037
2038 if (ext->get_property(ext, prop, &ret))
2039 continue;
2040
2041 switch (prop) {
2042 case POWER_SUPPLY_PROP_STATUS:
2043 switch (ext->type) {
2044 case POWER_SUPPLY_TYPE_BATTERY:
2045 switch (ret.intval) {
2046 case POWER_SUPPLY_STATUS_UNKNOWN:
2047 case POWER_SUPPLY_STATUS_DISCHARGING:
2048 case POWER_SUPPLY_STATUS_NOT_CHARGING:
2049 if (!di->flags.charging)
2050 break;
2051 di->flags.charging = false;
2052 di->flags.fully_charged = false;
2053 queue_work(di->fg_wq, &di->fg_work);
2054 break;
2055 case POWER_SUPPLY_STATUS_FULL:
2056 if (di->flags.fully_charged)
2057 break;
2058 di->flags.fully_charged = true;
2059 di->flags.force_full = true;
2060 /* Save current capacity as maximum */
2061 di->bat_cap.max_mah = di->bat_cap.mah;
2062 queue_work(di->fg_wq, &di->fg_work);
2063 break;
2064 case POWER_SUPPLY_STATUS_CHARGING:
2065 if (di->flags.charging)
2066 break;
2067 di->flags.charging = true;
2068 di->flags.fully_charged = false;
2069 queue_work(di->fg_wq, &di->fg_work);
2070 break;
2071 };
2072 default:
2073 break;
2074 };
2075 break;
2076 case POWER_SUPPLY_PROP_TECHNOLOGY:
2077 switch (ext->type) {
2078 case POWER_SUPPLY_TYPE_BATTERY:
2079 if (!di->flags.batt_id_received) {
2080 const struct battery_type *b;
2081 b = &(di->bat->bat_type[di->bat->batt_id]);
2082
2083 di->flags.batt_id_received = true;
2084
2085 di->bat_cap.max_mah_design =
2086 MILLI_TO_MICRO *
2087 b->charge_full_design;
2088
2089 di->bat_cap.max_mah =
2090 di->bat_cap.max_mah_design;
2091
2092 di->vbat_nom = b->nominal_voltage;
2093 }
2094
2095 if (ret.intval)
2096 di->flags.batt_unknown = false;
2097 else
2098 di->flags.batt_unknown = true;
2099 break;
2100 default:
2101 break;
2102 }
2103 break;
2104 case POWER_SUPPLY_PROP_TEMP:
2105 switch (ext->type) {
2106 case POWER_SUPPLY_TYPE_BATTERY:
2107 if (di->flags.batt_id_received)
2108 di->bat_temp = ret.intval;
2109 break;
2110 default:
2111 break;
2112 }
2113 break;
2114 default:
2115 break;
2116 }
2117 }
2118 return 0;
2119}
2120
2121/**
2122 * ab8500_fg_init_hw_registers() - Set up FG related registers
2123 * @di: pointer to the ab8500_fg structure
2124 *
2125 * Set up battery OVV, low battery voltage registers
2126 */
2127static int ab8500_fg_init_hw_registers(struct ab8500_fg *di)
2128{
2129 int ret;
2130
2131 /* Set VBAT OVV threshold */
2132 ret = abx500_mask_and_set_register_interruptible(di->dev,
2133 AB8500_CHARGER,
2134 AB8500_BATT_OVV,
2135 BATT_OVV_TH_4P75,
2136 BATT_OVV_TH_4P75);
2137 if (ret) {
2138 dev_err(di->dev, "failed to set BATT_OVV\n");
2139 goto out;
2140 }
2141
2142 /* Enable VBAT OVV detection */
2143 ret = abx500_mask_and_set_register_interruptible(di->dev,
2144 AB8500_CHARGER,
2145 AB8500_BATT_OVV,
2146 BATT_OVV_ENA,
2147 BATT_OVV_ENA);
2148 if (ret) {
2149 dev_err(di->dev, "failed to enable BATT_OVV\n");
2150 goto out;
2151 }
2152
2153 /* Low Battery Voltage */
2154 ret = abx500_set_register_interruptible(di->dev,
2155 AB8500_SYS_CTRL2_BLOCK,
2156 AB8500_LOW_BAT_REG,
2157 ab8500_volt_to_regval(
2158 di->bat->fg_params->lowbat_threshold) << 1 |
2159 LOW_BAT_ENABLE);
2160 if (ret) {
2161 dev_err(di->dev, "%s write failed\n", __func__);
2162 goto out;
2163 }
2164
2165 /* Battery OK threshold */
2166 ret = ab8500_fg_battok_init_hw_register(di);
2167 if (ret) {
2168 dev_err(di->dev, "BattOk init write failed.\n");
2169 goto out;
2170 }
2171out:
2172 return ret;
2173}
2174
2175/**
2176 * ab8500_fg_external_power_changed() - callback for power supply changes
2177 * @psy: pointer to the structure power_supply
2178 *
2179 * This function is the entry point of the pointer external_power_changed
2180 * of the structure power_supply.
2181 * This function gets executed when there is a change in any external power
2182 * supply that this driver needs to be notified of.
2183 */
2184static void ab8500_fg_external_power_changed(struct power_supply *psy)
2185{
2186 struct ab8500_fg *di = to_ab8500_fg_device_info(psy);
2187
2188 class_for_each_device(power_supply_class, NULL,
2189 &di->fg_psy, ab8500_fg_get_ext_psy_data);
2190}
2191
2192/**
2193 * abab8500_fg_reinit_work() - work to reset the FG algorithm
2194 * @work: pointer to the work_struct structure
2195 *
2196 * Used to reset the current battery capacity to be able to
2197 * retrigger a new voltage base capacity calculation. For
2198 * test and verification purpose.
2199 */
2200static void ab8500_fg_reinit_work(struct work_struct *work)
2201{
2202 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
2203 fg_reinit_work.work);
2204
2205 if (di->flags.calibrate == false) {
2206 dev_dbg(di->dev, "Resetting FG state machine to init.\n");
2207 ab8500_fg_clear_cap_samples(di);
2208 ab8500_fg_calc_cap_discharge_voltage(di, true);
2209 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
2210 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT);
2211 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2212
2213 } else {
2214 dev_err(di->dev, "Residual offset calibration ongoing "
2215 "retrying..\n");
2216 /* Wait one second until next try*/
2217 queue_delayed_work(di->fg_wq, &di->fg_reinit_work,
2218 round_jiffies(1));
2219 }
2220}
2221
2222/**
2223 * ab8500_fg_reinit() - forces FG algorithm to reinitialize with current values
2224 *
2225 * This function can be used to force the FG algorithm to recalculate a new
2226 * voltage based battery capacity.
2227 */
2228void ab8500_fg_reinit(void)
2229{
2230 struct ab8500_fg *di = ab8500_fg_get();
2231 /* User won't be notified if a null pointer returned. */
2232 if (di != NULL)
2233 queue_delayed_work(di->fg_wq, &di->fg_reinit_work, 0);
2234}
2235
2236/* Exposure to the sysfs interface */
2237
2238struct ab8500_fg_sysfs_entry {
2239 struct attribute attr;
2240 ssize_t (*show)(struct ab8500_fg *, char *);
2241 ssize_t (*store)(struct ab8500_fg *, const char *, size_t);
2242};
2243
2244static ssize_t charge_full_show(struct ab8500_fg *di, char *buf)
2245{
2246 return sprintf(buf, "%d\n", di->bat_cap.max_mah);
2247}
2248
2249static ssize_t charge_full_store(struct ab8500_fg *di, const char *buf,
2250 size_t count)
2251{
2252 unsigned long charge_full;
2253 ssize_t ret = -EINVAL;
2254
2255 ret = strict_strtoul(buf, 10, &charge_full);
2256
2257 dev_dbg(di->dev, "Ret %d charge_full %lu", ret, charge_full);
2258
2259 if (!ret) {
2260 di->bat_cap.max_mah = (int) charge_full;
2261 ret = count;
2262 }
2263 return ret;
2264}
2265
2266static ssize_t charge_now_show(struct ab8500_fg *di, char *buf)
2267{
2268 return sprintf(buf, "%d\n", di->bat_cap.prev_mah);
2269}
2270
2271static ssize_t charge_now_store(struct ab8500_fg *di, const char *buf,
2272 size_t count)
2273{
2274 unsigned long charge_now;
2275 ssize_t ret;
2276
2277 ret = strict_strtoul(buf, 10, &charge_now);
2278
2279 dev_dbg(di->dev, "Ret %d charge_now %lu was %d",
2280 ret, charge_now, di->bat_cap.prev_mah);
2281
2282 if (!ret) {
2283 di->bat_cap.user_mah = (int) charge_now;
2284 di->flags.user_cap = true;
2285 ret = count;
2286 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2287 }
2288 return ret;
2289}
2290
2291static struct ab8500_fg_sysfs_entry charge_full_attr =
2292 __ATTR(charge_full, 0644, charge_full_show, charge_full_store);
2293
2294static struct ab8500_fg_sysfs_entry charge_now_attr =
2295 __ATTR(charge_now, 0644, charge_now_show, charge_now_store);
2296
2297static ssize_t
2298ab8500_fg_show(struct kobject *kobj, struct attribute *attr, char *buf)
2299{
2300 struct ab8500_fg_sysfs_entry *entry;
2301 struct ab8500_fg *di;
2302
2303 entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr);
2304 di = container_of(kobj, struct ab8500_fg, fg_kobject);
2305
2306 if (!entry->show)
2307 return -EIO;
2308
2309 return entry->show(di, buf);
2310}
2311static ssize_t
2312ab8500_fg_store(struct kobject *kobj, struct attribute *attr, const char *buf,
2313 size_t count)
2314{
2315 struct ab8500_fg_sysfs_entry *entry;
2316 struct ab8500_fg *di;
2317
2318 entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr);
2319 di = container_of(kobj, struct ab8500_fg, fg_kobject);
2320
2321 if (!entry->store)
2322 return -EIO;
2323
2324 return entry->store(di, buf, count);
2325}
2326
2327const struct sysfs_ops ab8500_fg_sysfs_ops = {
2328 .show = ab8500_fg_show,
2329 .store = ab8500_fg_store,
2330};
2331
2332static struct attribute *ab8500_fg_attrs[] = {
2333 &charge_full_attr.attr,
2334 &charge_now_attr.attr,
2335 NULL,
2336};
2337
2338static struct kobj_type ab8500_fg_ktype = {
2339 .sysfs_ops = &ab8500_fg_sysfs_ops,
2340 .default_attrs = ab8500_fg_attrs,
2341};
2342
2343/**
2344 * ab8500_chargalg_sysfs_exit() - de-init of sysfs entry
2345 * @di: pointer to the struct ab8500_chargalg
2346 *
2347 * This function removes the entry in sysfs.
2348 */
2349static void ab8500_fg_sysfs_exit(struct ab8500_fg *di)
2350{
2351 kobject_del(&di->fg_kobject);
2352}
2353
2354/**
2355 * ab8500_chargalg_sysfs_init() - init of sysfs entry
2356 * @di: pointer to the struct ab8500_chargalg
2357 *
2358 * This function adds an entry in sysfs.
2359 * Returns error code in case of failure else 0(on success)
2360 */
2361static int ab8500_fg_sysfs_init(struct ab8500_fg *di)
2362{
2363 int ret = 0;
2364
2365 ret = kobject_init_and_add(&di->fg_kobject,
2366 &ab8500_fg_ktype,
2367 NULL, "battery");
2368 if (ret < 0)
2369 dev_err(di->dev, "failed to create sysfs entry\n");
2370
2371 return ret;
2372}
2373/* Exposure to the sysfs interface <<END>> */
2374
2375#if defined(CONFIG_PM)
2376static int ab8500_fg_resume(struct platform_device *pdev)
2377{
2378 struct ab8500_fg *di = platform_get_drvdata(pdev);
2379
2380 /*
2381 * Change state if we're not charging. If we're charging we will wake
2382 * up on the FG IRQ
2383 */
2384 if (!di->flags.charging) {
2385 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_WAKEUP);
2386 queue_work(di->fg_wq, &di->fg_work);
2387 }
2388
2389 return 0;
2390}
2391
2392static int ab8500_fg_suspend(struct platform_device *pdev,
2393 pm_message_t state)
2394{
2395 struct ab8500_fg *di = platform_get_drvdata(pdev);
2396
2397 flush_delayed_work(&di->fg_periodic_work);
2398
2399 /*
2400 * If the FG is enabled we will disable it before going to suspend
2401 * only if we're not charging
2402 */
2403 if (di->flags.fg_enabled && !di->flags.charging)
2404 ab8500_fg_coulomb_counter(di, false);
2405
2406 return 0;
2407}
2408#else
2409#define ab8500_fg_suspend NULL
2410#define ab8500_fg_resume NULL
2411#endif
2412
2413static int __devexit ab8500_fg_remove(struct platform_device *pdev)
2414{
2415 int ret = 0;
2416 struct ab8500_fg *di = platform_get_drvdata(pdev);
2417
2418 list_del(&di->node);
2419
2420 /* Disable coulomb counter */
2421 ret = ab8500_fg_coulomb_counter(di, false);
2422 if (ret)
2423 dev_err(di->dev, "failed to disable coulomb counter\n");
2424
2425 destroy_workqueue(di->fg_wq);
2426 ab8500_fg_sysfs_exit(di);
2427
2428 flush_scheduled_work();
2429 power_supply_unregister(&di->fg_psy);
2430 platform_set_drvdata(pdev, NULL);
2431 kfree(di);
2432 return ret;
2433}
2434
2435/* ab8500 fg driver interrupts and their respective isr */
2436static struct ab8500_fg_interrupts ab8500_fg_irq[] = {
2437 {"NCONV_ACCU", ab8500_fg_cc_convend_handler},
2438 {"BATT_OVV", ab8500_fg_batt_ovv_handler},
2439 {"LOW_BAT_F", ab8500_fg_lowbatf_handler},
2440 {"CC_INT_CALIB", ab8500_fg_cc_int_calib_handler},
2441 {"CCEOC", ab8500_fg_cc_data_end_handler},
2442};
2443
2444static int __devinit ab8500_fg_probe(struct platform_device *pdev)
2445{
2446 int i, irq;
2447 int ret = 0;
2448 struct abx500_bm_plat_data *plat_data;
2449
2450 struct ab8500_fg *di =
2451 kzalloc(sizeof(struct ab8500_fg), GFP_KERNEL);
2452 if (!di)
2453 return -ENOMEM;
2454
2455 mutex_init(&di->cc_lock);
2456
2457 /* get parent data */
2458 di->dev = &pdev->dev;
2459 di->parent = dev_get_drvdata(pdev->dev.parent);
2460 di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
2461
2462 /* get fg specific platform data */
2463 plat_data = pdev->dev.platform_data;
2464 di->pdata = plat_data->fg;
2465 if (!di->pdata) {
2466 dev_err(di->dev, "no fg platform data supplied\n");
2467 ret = -EINVAL;
2468 goto free_device_info;
2469 }
2470
2471 /* get battery specific platform data */
2472 di->bat = plat_data->battery;
2473 if (!di->bat) {
2474 dev_err(di->dev, "no battery platform data supplied\n");
2475 ret = -EINVAL;
2476 goto free_device_info;
2477 }
2478
2479 di->fg_psy.name = "ab8500_fg";
2480 di->fg_psy.type = POWER_SUPPLY_TYPE_BATTERY;
2481 di->fg_psy.properties = ab8500_fg_props;
2482 di->fg_psy.num_properties = ARRAY_SIZE(ab8500_fg_props);
2483 di->fg_psy.get_property = ab8500_fg_get_property;
2484 di->fg_psy.supplied_to = di->pdata->supplied_to;
2485 di->fg_psy.num_supplicants = di->pdata->num_supplicants;
2486 di->fg_psy.external_power_changed = ab8500_fg_external_power_changed;
2487
2488 di->bat_cap.max_mah_design = MILLI_TO_MICRO *
2489 di->bat->bat_type[di->bat->batt_id].charge_full_design;
2490
2491 di->bat_cap.max_mah = di->bat_cap.max_mah_design;
2492
2493 di->vbat_nom = di->bat->bat_type[di->bat->batt_id].nominal_voltage;
2494
2495 di->init_capacity = true;
2496
2497 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
2498 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT);
2499
2500 /* Create a work queue for running the FG algorithm */
2501 di->fg_wq = create_singlethread_workqueue("ab8500_fg_wq");
2502 if (di->fg_wq == NULL) {
2503 dev_err(di->dev, "failed to create work queue\n");
2504 goto free_device_info;
2505 }
2506
2507 /* Init work for running the fg algorithm instantly */
2508 INIT_WORK(&di->fg_work, ab8500_fg_instant_work);
2509
2510 /* Init work for getting the battery accumulated current */
2511 INIT_WORK(&di->fg_acc_cur_work, ab8500_fg_acc_cur_work);
2512
2513 /* Init work for reinitialising the fg algorithm */
2514 INIT_DELAYED_WORK_DEFERRABLE(&di->fg_reinit_work,
2515 ab8500_fg_reinit_work);
2516
2517 /* Work delayed Queue to run the state machine */
2518 INIT_DELAYED_WORK_DEFERRABLE(&di->fg_periodic_work,
2519 ab8500_fg_periodic_work);
2520
2521 /* Work to check low battery condition */
2522 INIT_DELAYED_WORK_DEFERRABLE(&di->fg_low_bat_work,
2523 ab8500_fg_low_bat_work);
2524
2525 /* Init work for HW failure check */
2526 INIT_DELAYED_WORK_DEFERRABLE(&di->fg_check_hw_failure_work,
2527 ab8500_fg_check_hw_failure_work);
2528
2529 /* Initialize OVV, and other registers */
2530 ret = ab8500_fg_init_hw_registers(di);
2531 if (ret) {
2532 dev_err(di->dev, "failed to initialize registers\n");
2533 goto free_inst_curr_wq;
2534 }
2535
2536 /* Consider battery unknown until we're informed otherwise */
2537 di->flags.batt_unknown = true;
2538 di->flags.batt_id_received = false;
2539
2540 /* Register FG power supply class */
2541 ret = power_supply_register(di->dev, &di->fg_psy);
2542 if (ret) {
2543 dev_err(di->dev, "failed to register FG psy\n");
2544 goto free_inst_curr_wq;
2545 }
2546
2547 di->fg_samples = SEC_TO_SAMPLE(di->bat->fg_params->init_timer);
2548 ab8500_fg_coulomb_counter(di, true);
2549
2550 /* Initialize completion used to notify completion of inst current */
2551 init_completion(&di->ab8500_fg_complete);
2552
2553 /* Register interrupts */
2554 for (i = 0; i < ARRAY_SIZE(ab8500_fg_irq); i++) {
2555 irq = platform_get_irq_byname(pdev, ab8500_fg_irq[i].name);
2556 ret = request_threaded_irq(irq, NULL, ab8500_fg_irq[i].isr,
2557 IRQF_SHARED | IRQF_NO_SUSPEND,
2558 ab8500_fg_irq[i].name, di);
2559
2560 if (ret != 0) {
2561 dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
2562 , ab8500_fg_irq[i].name, irq, ret);
2563 goto free_irq;
2564 }
2565 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
2566 ab8500_fg_irq[i].name, irq, ret);
2567 }
2568 di->irq = platform_get_irq_byname(pdev, "CCEOC");
2569 disable_irq(di->irq);
2570
2571 platform_set_drvdata(pdev, di);
2572
2573 ret = ab8500_fg_sysfs_init(di);
2574 if (ret) {
2575 dev_err(di->dev, "failed to create sysfs entry\n");
2576 goto free_irq;
2577 }
2578
2579 /* Calibrate the fg first time */
2580 di->flags.calibrate = true;
2581 di->calib_state = AB8500_FG_CALIB_INIT;
2582
2583 /* Use room temp as default value until we get an update from driver. */
2584 di->bat_temp = 210;
2585
2586 /* Run the FG algorithm */
2587 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2588
2589 list_add_tail(&di->node, &ab8500_fg_list);
2590
2591 return ret;
2592
2593free_irq:
2594 power_supply_unregister(&di->fg_psy);
2595
2596 /* We also have to free all successfully registered irqs */
2597 for (i = i - 1; i >= 0; i--) {
2598 irq = platform_get_irq_byname(pdev, ab8500_fg_irq[i].name);
2599 free_irq(irq, di);
2600 }
2601free_inst_curr_wq:
2602 destroy_workqueue(di->fg_wq);
2603free_device_info:
2604 kfree(di);
2605
2606 return ret;
2607}
2608
2609static struct platform_driver ab8500_fg_driver = {
2610 .probe = ab8500_fg_probe,
2611 .remove = __devexit_p(ab8500_fg_remove),
2612 .suspend = ab8500_fg_suspend,
2613 .resume = ab8500_fg_resume,
2614 .driver = {
2615 .name = "ab8500-fg",
2616 .owner = THIS_MODULE,
2617 },
2618};
2619
2620static int __init ab8500_fg_init(void)
2621{
2622 return platform_driver_register(&ab8500_fg_driver);
2623}
2624
2625static void __exit ab8500_fg_exit(void)
2626{
2627 platform_driver_unregister(&ab8500_fg_driver);
2628}
2629
2630subsys_initcall_sync(ab8500_fg_init);
2631module_exit(ab8500_fg_exit);
2632
2633MODULE_LICENSE("GPL v2");
2634MODULE_AUTHOR("Johan Palsson, Karl Komierowski");
2635MODULE_ALIAS("platform:ab8500-fg");
2636MODULE_DESCRIPTION("AB8500 Fuel Gauge driver");
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-03 23:44:32 -0500