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1 | /* |
2 | * Copyright (C) ST-Ericsson AB 2012 | |
3 | * | |
4 | * Main and Back-up battery management driver. | |
5 | * | |
6 | * Note: Backup battery management is required in case of Li-Ion battery and not | |
7 | * for capacitive battery. HREF boards have capacitive battery and hence backup | |
8 | * battery management is not used and the supported code is available in this | |
9 | * driver. | |
10 | * | |
11 | * License Terms: GNU General Public License v2 | |
12 | * Author: | |
13 | * Johan Palsson <johan.palsson@stericsson.com> | |
14 | * Karl Komierowski <karl.komierowski@stericsson.com> | |
15 | * Arun R Murthy <arun.murthy@stericsson.com> | |
16 | */ | |
17 | ||
18 | #include <linux/init.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/device.h> | |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/platform_device.h> | |
23 | #include <linux/power_supply.h> | |
24 | #include <linux/kobject.h> | |
25 | #include <linux/mfd/abx500/ab8500.h> | |
26 | #include <linux/mfd/abx500.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/mfd/abx500/ab8500-bm.h> | |
29 | #include <linux/delay.h> | |
30 | #include <linux/mfd/abx500/ab8500-gpadc.h> | |
31 | #include <linux/mfd/abx500.h> | |
32 | #include <linux/time.h> | |
33 | #include <linux/completion.h> | |
34 | ||
35 | #define MILLI_TO_MICRO 1000 | |
36 | #define FG_LSB_IN_MA 1627 | |
37 | #define QLSB_NANO_AMP_HOURS_X10 1129 | |
38 | #define INS_CURR_TIMEOUT (3 * HZ) | |
39 | ||
40 | #define SEC_TO_SAMPLE(S) (S * 4) | |
41 | ||
42 | #define NBR_AVG_SAMPLES 20 | |
43 | ||
44 | #define LOW_BAT_CHECK_INTERVAL (2 * HZ) | |
45 | ||
46 | #define VALID_CAPACITY_SEC (45 * 60) /* 45 minutes */ | |
47 | #define BATT_OK_MIN 2360 /* mV */ | |
48 | #define BATT_OK_INCREMENT 50 /* mV */ | |
49 | #define BATT_OK_MAX_NR_INCREMENTS 0xE | |
50 | ||
51 | /* FG constants */ | |
52 | #define BATT_OVV 0x01 | |
53 | ||
54 | #define interpolate(x, x1, y1, x2, y2) \ | |
55 | ((y1) + ((((y2) - (y1)) * ((x) - (x1))) / ((x2) - (x1)))); | |
56 | ||
57 | #define to_ab8500_fg_device_info(x) container_of((x), \ | |
58 | struct ab8500_fg, fg_psy); | |
59 | ||
60 | /** | |
61 | * struct ab8500_fg_interrupts - ab8500 fg interupts | |
62 | * @name: name of the interrupt | |
63 | * @isr function pointer to the isr | |
64 | */ | |
65 | struct ab8500_fg_interrupts { | |
66 | char *name; | |
67 | irqreturn_t (*isr)(int irq, void *data); | |
68 | }; | |
69 | ||
70 | enum ab8500_fg_discharge_state { | |
71 | AB8500_FG_DISCHARGE_INIT, | |
72 | AB8500_FG_DISCHARGE_INITMEASURING, | |
73 | AB8500_FG_DISCHARGE_INIT_RECOVERY, | |
74 | AB8500_FG_DISCHARGE_RECOVERY, | |
75 | AB8500_FG_DISCHARGE_READOUT_INIT, | |
76 | AB8500_FG_DISCHARGE_READOUT, | |
77 | AB8500_FG_DISCHARGE_WAKEUP, | |
78 | }; | |
79 | ||
80 | static char *discharge_state[] = { | |
81 | "DISCHARGE_INIT", | |
82 | "DISCHARGE_INITMEASURING", | |
83 | "DISCHARGE_INIT_RECOVERY", | |
84 | "DISCHARGE_RECOVERY", | |
85 | "DISCHARGE_READOUT_INIT", | |
86 | "DISCHARGE_READOUT", | |
87 | "DISCHARGE_WAKEUP", | |
88 | }; | |
89 | ||
90 | enum ab8500_fg_charge_state { | |
91 | AB8500_FG_CHARGE_INIT, | |
92 | AB8500_FG_CHARGE_READOUT, | |
93 | }; | |
94 | ||
95 | static char *charge_state[] = { | |
96 | "CHARGE_INIT", | |
97 | "CHARGE_READOUT", | |
98 | }; | |
99 | ||
100 | enum ab8500_fg_calibration_state { | |
101 | AB8500_FG_CALIB_INIT, | |
102 | AB8500_FG_CALIB_WAIT, | |
103 | AB8500_FG_CALIB_END, | |
104 | }; | |
105 | ||
106 | struct ab8500_fg_avg_cap { | |
107 | int avg; | |
108 | int samples[NBR_AVG_SAMPLES]; | |
109 | __kernel_time_t time_stamps[NBR_AVG_SAMPLES]; | |
110 | int pos; | |
111 | int nbr_samples; | |
112 | int sum; | |
113 | }; | |
114 | ||
115 | struct ab8500_fg_battery_capacity { | |
116 | int max_mah_design; | |
117 | int max_mah; | |
118 | int mah; | |
119 | int permille; | |
120 | int level; | |
121 | int prev_mah; | |
122 | int prev_percent; | |
123 | int prev_level; | |
124 | int user_mah; | |
125 | }; | |
126 | ||
127 | struct ab8500_fg_flags { | |
128 | bool fg_enabled; | |
129 | bool conv_done; | |
130 | bool charging; | |
131 | bool fully_charged; | |
132 | bool force_full; | |
133 | bool low_bat_delay; | |
134 | bool low_bat; | |
135 | bool bat_ovv; | |
136 | bool batt_unknown; | |
137 | bool calibrate; | |
138 | bool user_cap; | |
139 | bool batt_id_received; | |
140 | }; | |
141 | ||
142 | struct inst_curr_result_list { | |
143 | struct list_head list; | |
144 | int *result; | |
145 | }; | |
146 | ||
147 | /** | |
148 | * struct ab8500_fg - ab8500 FG device information | |
149 | * @dev: Pointer to the structure device | |
150 | * @node: a list of AB8500 FGs, hence prepared for reentrance | |
151 | * @irq holds the CCEOC interrupt number | |
152 | * @vbat: Battery voltage in mV | |
153 | * @vbat_nom: Nominal battery voltage in mV | |
154 | * @inst_curr: Instantenous battery current in mA | |
155 | * @avg_curr: Average battery current in mA | |
156 | * @bat_temp battery temperature | |
157 | * @fg_samples: Number of samples used in the FG accumulation | |
158 | * @accu_charge: Accumulated charge from the last conversion | |
159 | * @recovery_cnt: Counter for recovery mode | |
160 | * @high_curr_cnt: Counter for high current mode | |
161 | * @init_cnt: Counter for init mode | |
162 | * @recovery_needed: Indicate if recovery is needed | |
163 | * @high_curr_mode: Indicate if we're in high current mode | |
164 | * @init_capacity: Indicate if initial capacity measuring should be done | |
165 | * @turn_off_fg: True if fg was off before current measurement | |
166 | * @calib_state State during offset calibration | |
167 | * @discharge_state: Current discharge state | |
168 | * @charge_state: Current charge state | |
169 | * @ab8500_fg_complete Completion struct used for the instant current reading | |
170 | * @flags: Structure for information about events triggered | |
171 | * @bat_cap: Structure for battery capacity specific parameters | |
172 | * @avg_cap: Average capacity filter | |
173 | * @parent: Pointer to the struct ab8500 | |
174 | * @gpadc: Pointer to the struct gpadc | |
175 | * @pdata: Pointer to the abx500_fg platform data | |
176 | * @bat: Pointer to the abx500_bm platform data | |
177 | * @fg_psy: Structure that holds the FG specific battery properties | |
178 | * @fg_wq: Work queue for running the FG algorithm | |
179 | * @fg_periodic_work: Work to run the FG algorithm periodically | |
180 | * @fg_low_bat_work: Work to check low bat condition | |
181 | * @fg_reinit_work Work used to reset and reinitialise the FG algorithm | |
182 | * @fg_work: Work to run the FG algorithm instantly | |
183 | * @fg_acc_cur_work: Work to read the FG accumulator | |
184 | * @fg_check_hw_failure_work: Work for checking HW state | |
185 | * @cc_lock: Mutex for locking the CC | |
186 | * @fg_kobject: Structure of type kobject | |
187 | */ | |
188 | struct ab8500_fg { | |
189 | struct device *dev; | |
190 | struct list_head node; | |
191 | int irq; | |
192 | int vbat; | |
193 | int vbat_nom; | |
194 | int inst_curr; | |
195 | int avg_curr; | |
196 | int bat_temp; | |
197 | int fg_samples; | |
198 | int accu_charge; | |
199 | int recovery_cnt; | |
200 | int high_curr_cnt; | |
201 | int init_cnt; | |
202 | bool recovery_needed; | |
203 | bool high_curr_mode; | |
204 | bool init_capacity; | |
205 | bool turn_off_fg; | |
206 | enum ab8500_fg_calibration_state calib_state; | |
207 | enum ab8500_fg_discharge_state discharge_state; | |
208 | enum ab8500_fg_charge_state charge_state; | |
209 | struct completion ab8500_fg_complete; | |
210 | struct ab8500_fg_flags flags; | |
211 | struct ab8500_fg_battery_capacity bat_cap; | |
212 | struct ab8500_fg_avg_cap avg_cap; | |
213 | struct ab8500 *parent; | |
214 | struct ab8500_gpadc *gpadc; | |
215 | struct abx500_fg_platform_data *pdata; | |
216 | struct abx500_bm_data *bat; | |
217 | struct power_supply fg_psy; | |
218 | struct workqueue_struct *fg_wq; | |
219 | struct delayed_work fg_periodic_work; | |
220 | struct delayed_work fg_low_bat_work; | |
221 | struct delayed_work fg_reinit_work; | |
222 | struct work_struct fg_work; | |
223 | struct work_struct fg_acc_cur_work; | |
224 | struct delayed_work fg_check_hw_failure_work; | |
225 | struct mutex cc_lock; | |
226 | struct kobject fg_kobject; | |
227 | }; | |
228 | static LIST_HEAD(ab8500_fg_list); | |
229 | ||
230 | /** | |
231 | * ab8500_fg_get() - returns a reference to the primary AB8500 fuel gauge | |
232 | * (i.e. the first fuel gauge in the instance list) | |
233 | */ | |
234 | struct ab8500_fg *ab8500_fg_get(void) | |
235 | { | |
236 | struct ab8500_fg *fg; | |
237 | ||
238 | if (list_empty(&ab8500_fg_list)) | |
239 | return NULL; | |
240 | ||
241 | fg = list_first_entry(&ab8500_fg_list, struct ab8500_fg, node); | |
242 | return fg; | |
243 | } | |
244 | ||
245 | /* Main battery properties */ | |
246 | static enum power_supply_property ab8500_fg_props[] = { | |
247 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
248 | POWER_SUPPLY_PROP_CURRENT_NOW, | |
249 | POWER_SUPPLY_PROP_CURRENT_AVG, | |
250 | POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, | |
251 | POWER_SUPPLY_PROP_ENERGY_FULL, | |
252 | POWER_SUPPLY_PROP_ENERGY_NOW, | |
253 | POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, | |
254 | POWER_SUPPLY_PROP_CHARGE_FULL, | |
255 | POWER_SUPPLY_PROP_CHARGE_NOW, | |
256 | POWER_SUPPLY_PROP_CAPACITY, | |
257 | POWER_SUPPLY_PROP_CAPACITY_LEVEL, | |
258 | }; | |
259 | ||
260 | /* | |
261 | * This array maps the raw hex value to lowbat voltage used by the AB8500 | |
262 | * Values taken from the UM0836 | |
263 | */ | |
264 | static int ab8500_fg_lowbat_voltage_map[] = { | |
265 | 2300 , | |
266 | 2325 , | |
267 | 2350 , | |
268 | 2375 , | |
269 | 2400 , | |
270 | 2425 , | |
271 | 2450 , | |
272 | 2475 , | |
273 | 2500 , | |
274 | 2525 , | |
275 | 2550 , | |
276 | 2575 , | |
277 | 2600 , | |
278 | 2625 , | |
279 | 2650 , | |
280 | 2675 , | |
281 | 2700 , | |
282 | 2725 , | |
283 | 2750 , | |
284 | 2775 , | |
285 | 2800 , | |
286 | 2825 , | |
287 | 2850 , | |
288 | 2875 , | |
289 | 2900 , | |
290 | 2925 , | |
291 | 2950 , | |
292 | 2975 , | |
293 | 3000 , | |
294 | 3025 , | |
295 | 3050 , | |
296 | 3075 , | |
297 | 3100 , | |
298 | 3125 , | |
299 | 3150 , | |
300 | 3175 , | |
301 | 3200 , | |
302 | 3225 , | |
303 | 3250 , | |
304 | 3275 , | |
305 | 3300 , | |
306 | 3325 , | |
307 | 3350 , | |
308 | 3375 , | |
309 | 3400 , | |
310 | 3425 , | |
311 | 3450 , | |
312 | 3475 , | |
313 | 3500 , | |
314 | 3525 , | |
315 | 3550 , | |
316 | 3575 , | |
317 | 3600 , | |
318 | 3625 , | |
319 | 3650 , | |
320 | 3675 , | |
321 | 3700 , | |
322 | 3725 , | |
323 | 3750 , | |
324 | 3775 , | |
325 | 3800 , | |
326 | 3825 , | |
327 | 3850 , | |
328 | 3850 , | |
329 | }; | |
330 | ||
331 | static u8 ab8500_volt_to_regval(int voltage) | |
332 | { | |
333 | int i; | |
334 | ||
335 | if (voltage < ab8500_fg_lowbat_voltage_map[0]) | |
336 | return 0; | |
337 | ||
338 | for (i = 0; i < ARRAY_SIZE(ab8500_fg_lowbat_voltage_map); i++) { | |
339 | if (voltage < ab8500_fg_lowbat_voltage_map[i]) | |
340 | return (u8) i - 1; | |
341 | } | |
342 | ||
343 | /* If not captured above, return index of last element */ | |
344 | return (u8) ARRAY_SIZE(ab8500_fg_lowbat_voltage_map) - 1; | |
345 | } | |
346 | ||
347 | /** | |
348 | * ab8500_fg_is_low_curr() - Low or high current mode | |
349 | * @di: pointer to the ab8500_fg structure | |
350 | * @curr: the current to base or our decision on | |
351 | * | |
352 | * Low current mode if the current consumption is below a certain threshold | |
353 | */ | |
354 | static int ab8500_fg_is_low_curr(struct ab8500_fg *di, int curr) | |
355 | { | |
356 | /* | |
357 | * We want to know if we're in low current mode | |
358 | */ | |
359 | if (curr > -di->bat->fg_params->high_curr_threshold) | |
360 | return true; | |
361 | else | |
362 | return false; | |
363 | } | |
364 | ||
365 | /** | |
366 | * ab8500_fg_add_cap_sample() - Add capacity to average filter | |
367 | * @di: pointer to the ab8500_fg structure | |
368 | * @sample: the capacity in mAh to add to the filter | |
369 | * | |
370 | * A capacity is added to the filter and a new mean capacity is calculated and | |
371 | * returned | |
372 | */ | |
373 | static int ab8500_fg_add_cap_sample(struct ab8500_fg *di, int sample) | |
374 | { | |
375 | struct timespec ts; | |
376 | struct ab8500_fg_avg_cap *avg = &di->avg_cap; | |
377 | ||
378 | getnstimeofday(&ts); | |
379 | ||
380 | do { | |
381 | avg->sum += sample - avg->samples[avg->pos]; | |
382 | avg->samples[avg->pos] = sample; | |
383 | avg->time_stamps[avg->pos] = ts.tv_sec; | |
384 | avg->pos++; | |
385 | ||
386 | if (avg->pos == NBR_AVG_SAMPLES) | |
387 | avg->pos = 0; | |
388 | ||
389 | if (avg->nbr_samples < NBR_AVG_SAMPLES) | |
390 | avg->nbr_samples++; | |
391 | ||
392 | /* | |
393 | * Check the time stamp for each sample. If too old, | |
394 | * replace with latest sample | |
395 | */ | |
396 | } while (ts.tv_sec - VALID_CAPACITY_SEC > avg->time_stamps[avg->pos]); | |
397 | ||
398 | avg->avg = avg->sum / avg->nbr_samples; | |
399 | ||
400 | return avg->avg; | |
401 | } | |
402 | ||
403 | /** | |
404 | * ab8500_fg_clear_cap_samples() - Clear average filter | |
405 | * @di: pointer to the ab8500_fg structure | |
406 | * | |
407 | * The capacity filter is is reset to zero. | |
408 | */ | |
409 | static void ab8500_fg_clear_cap_samples(struct ab8500_fg *di) | |
410 | { | |
411 | int i; | |
412 | struct ab8500_fg_avg_cap *avg = &di->avg_cap; | |
413 | ||
414 | avg->pos = 0; | |
415 | avg->nbr_samples = 0; | |
416 | avg->sum = 0; | |
417 | avg->avg = 0; | |
418 | ||
419 | for (i = 0; i < NBR_AVG_SAMPLES; i++) { | |
420 | avg->samples[i] = 0; | |
421 | avg->time_stamps[i] = 0; | |
422 | } | |
423 | } | |
424 | ||
425 | /** | |
426 | * ab8500_fg_fill_cap_sample() - Fill average filter | |
427 | * @di: pointer to the ab8500_fg structure | |
428 | * @sample: the capacity in mAh to fill the filter with | |
429 | * | |
430 | * The capacity filter is filled with a capacity in mAh | |
431 | */ | |
432 | static void ab8500_fg_fill_cap_sample(struct ab8500_fg *di, int sample) | |
433 | { | |
434 | int i; | |
435 | struct timespec ts; | |
436 | struct ab8500_fg_avg_cap *avg = &di->avg_cap; | |
437 | ||
438 | getnstimeofday(&ts); | |
439 | ||
440 | for (i = 0; i < NBR_AVG_SAMPLES; i++) { | |
441 | avg->samples[i] = sample; | |
442 | avg->time_stamps[i] = ts.tv_sec; | |
443 | } | |
444 | ||
445 | avg->pos = 0; | |
446 | avg->nbr_samples = NBR_AVG_SAMPLES; | |
447 | avg->sum = sample * NBR_AVG_SAMPLES; | |
448 | avg->avg = sample; | |
449 | } | |
450 | ||
451 | /** | |
452 | * ab8500_fg_coulomb_counter() - enable coulomb counter | |
453 | * @di: pointer to the ab8500_fg structure | |
454 | * @enable: enable/disable | |
455 | * | |
456 | * Enable/Disable coulomb counter. | |
457 | * On failure returns negative value. | |
458 | */ | |
459 | static int ab8500_fg_coulomb_counter(struct ab8500_fg *di, bool enable) | |
460 | { | |
461 | int ret = 0; | |
462 | mutex_lock(&di->cc_lock); | |
463 | if (enable) { | |
464 | /* To be able to reprogram the number of samples, we have to | |
465 | * first stop the CC and then enable it again */ | |
466 | ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, | |
467 | AB8500_RTC_CC_CONF_REG, 0x00); | |
468 | if (ret) | |
469 | goto cc_err; | |
470 | ||
471 | /* Program the samples */ | |
472 | ret = abx500_set_register_interruptible(di->dev, | |
473 | AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU, | |
474 | di->fg_samples); | |
475 | if (ret) | |
476 | goto cc_err; | |
477 | ||
478 | /* Start the CC */ | |
479 | ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, | |
480 | AB8500_RTC_CC_CONF_REG, | |
481 | (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA)); | |
482 | if (ret) | |
483 | goto cc_err; | |
484 | ||
485 | di->flags.fg_enabled = true; | |
486 | } else { | |
487 | /* Clear any pending read requests */ | |
488 | ret = abx500_set_register_interruptible(di->dev, | |
489 | AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 0); | |
490 | if (ret) | |
491 | goto cc_err; | |
492 | ||
493 | ret = abx500_set_register_interruptible(di->dev, | |
494 | AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU_CTRL, 0); | |
495 | if (ret) | |
496 | goto cc_err; | |
497 | ||
498 | /* Stop the CC */ | |
499 | ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, | |
500 | AB8500_RTC_CC_CONF_REG, 0); | |
501 | if (ret) | |
502 | goto cc_err; | |
503 | ||
504 | di->flags.fg_enabled = false; | |
505 | ||
506 | } | |
507 | dev_dbg(di->dev, " CC enabled: %d Samples: %d\n", | |
508 | enable, di->fg_samples); | |
509 | ||
510 | mutex_unlock(&di->cc_lock); | |
511 | ||
512 | return ret; | |
513 | cc_err: | |
514 | dev_err(di->dev, "%s Enabling coulomb counter failed\n", __func__); | |
515 | mutex_unlock(&di->cc_lock); | |
516 | return ret; | |
517 | } | |
518 | ||
519 | /** | |
520 | * ab8500_fg_inst_curr_start() - start battery instantaneous current | |
521 | * @di: pointer to the ab8500_fg structure | |
522 | * | |
523 | * Returns 0 or error code | |
524 | * Note: This is part "one" and has to be called before | |
525 | * ab8500_fg_inst_curr_finalize() | |
526 | */ | |
527 | int ab8500_fg_inst_curr_start(struct ab8500_fg *di) | |
528 | { | |
529 | u8 reg_val; | |
530 | int ret; | |
531 | ||
532 | mutex_lock(&di->cc_lock); | |
533 | ||
534 | ret = abx500_get_register_interruptible(di->dev, AB8500_RTC, | |
535 | AB8500_RTC_CC_CONF_REG, ®_val); | |
536 | if (ret < 0) | |
537 | goto fail; | |
538 | ||
539 | if (!(reg_val & CC_PWR_UP_ENA)) { | |
540 | dev_dbg(di->dev, "%s Enable FG\n", __func__); | |
541 | di->turn_off_fg = true; | |
542 | ||
543 | /* Program the samples */ | |
544 | ret = abx500_set_register_interruptible(di->dev, | |
545 | AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU, | |
546 | SEC_TO_SAMPLE(10)); | |
547 | if (ret) | |
548 | goto fail; | |
549 | ||
550 | /* Start the CC */ | |
551 | ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, | |
552 | AB8500_RTC_CC_CONF_REG, | |
553 | (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA)); | |
554 | if (ret) | |
555 | goto fail; | |
556 | } else { | |
557 | di->turn_off_fg = false; | |
558 | } | |
559 | ||
560 | /* Return and WFI */ | |
561 | INIT_COMPLETION(di->ab8500_fg_complete); | |
562 | enable_irq(di->irq); | |
563 | ||
564 | /* Note: cc_lock is still locked */ | |
565 | return 0; | |
566 | fail: | |
567 | mutex_unlock(&di->cc_lock); | |
568 | return ret; | |
569 | } | |
570 | ||
571 | /** | |
572 | * ab8500_fg_inst_curr_done() - check if fg conversion is done | |
573 | * @di: pointer to the ab8500_fg structure | |
574 | * | |
575 | * Returns 1 if conversion done, 0 if still waiting | |
576 | */ | |
577 | int ab8500_fg_inst_curr_done(struct ab8500_fg *di) | |
578 | { | |
579 | return completion_done(&di->ab8500_fg_complete); | |
580 | } | |
581 | ||
582 | /** | |
583 | * ab8500_fg_inst_curr_finalize() - battery instantaneous current | |
584 | * @di: pointer to the ab8500_fg structure | |
585 | * @res: battery instantenous current(on success) | |
586 | * | |
587 | * Returns 0 or an error code | |
588 | * Note: This is part "two" and has to be called at earliest 250 ms | |
589 | * after ab8500_fg_inst_curr_start() | |
590 | */ | |
591 | int ab8500_fg_inst_curr_finalize(struct ab8500_fg *di, int *res) | |
592 | { | |
593 | u8 low, high; | |
594 | int val; | |
595 | int ret; | |
596 | int timeout; | |
597 | ||
598 | if (!completion_done(&di->ab8500_fg_complete)) { | |
599 | timeout = wait_for_completion_timeout(&di->ab8500_fg_complete, | |
600 | INS_CURR_TIMEOUT); | |
601 | dev_dbg(di->dev, "Finalize time: %d ms\n", | |
602 | ((INS_CURR_TIMEOUT - timeout) * 1000) / HZ); | |
603 | if (!timeout) { | |
604 | ret = -ETIME; | |
605 | disable_irq(di->irq); | |
606 | dev_err(di->dev, "completion timed out [%d]\n", | |
607 | __LINE__); | |
608 | goto fail; | |
609 | } | |
610 | } | |
611 | ||
612 | disable_irq(di->irq); | |
613 | ||
614 | ret = abx500_mask_and_set_register_interruptible(di->dev, | |
615 | AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, | |
616 | READ_REQ, READ_REQ); | |
617 | ||
618 | /* 100uS between read request and read is needed */ | |
619 | usleep_range(100, 100); | |
620 | ||
621 | /* Read CC Sample conversion value Low and high */ | |
622 | ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE, | |
623 | AB8500_GASG_CC_SMPL_CNVL_REG, &low); | |
624 | if (ret < 0) | |
625 | goto fail; | |
626 | ||
627 | ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE, | |
628 | AB8500_GASG_CC_SMPL_CNVH_REG, &high); | |
629 | if (ret < 0) | |
630 | goto fail; | |
631 | ||
632 | /* | |
633 | * negative value for Discharging | |
634 | * convert 2's compliment into decimal | |
635 | */ | |
636 | if (high & 0x10) | |
637 | val = (low | (high << 8) | 0xFFFFE000); | |
638 | else | |
639 | val = (low | (high << 8)); | |
640 | ||
641 | /* | |
642 | * Convert to unit value in mA | |
643 | * Full scale input voltage is | |
644 | * 66.660mV => LSB = 66.660mV/(4096*res) = 1.627mA | |
645 | * Given a 250ms conversion cycle time the LSB corresponds | |
646 | * to 112.9 nAh. Convert to current by dividing by the conversion | |
647 | * time in hours (250ms = 1 / (3600 * 4)h) | |
648 | * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm | |
649 | */ | |
650 | val = (val * QLSB_NANO_AMP_HOURS_X10 * 36 * 4) / | |
651 | (1000 * di->bat->fg_res); | |
652 | ||
653 | if (di->turn_off_fg) { | |
654 | dev_dbg(di->dev, "%s Disable FG\n", __func__); | |
655 | ||
656 | /* Clear any pending read requests */ | |
657 | ret = abx500_set_register_interruptible(di->dev, | |
658 | AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 0); | |
659 | if (ret) | |
660 | goto fail; | |
661 | ||
662 | /* Stop the CC */ | |
663 | ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, | |
664 | AB8500_RTC_CC_CONF_REG, 0); | |
665 | if (ret) | |
666 | goto fail; | |
667 | } | |
668 | mutex_unlock(&di->cc_lock); | |
669 | (*res) = val; | |
670 | ||
671 | return 0; | |
672 | fail: | |
673 | mutex_unlock(&di->cc_lock); | |
674 | return ret; | |
675 | } | |
676 | ||
677 | /** | |
678 | * ab8500_fg_inst_curr_blocking() - battery instantaneous current | |
679 | * @di: pointer to the ab8500_fg structure | |
680 | * @res: battery instantenous current(on success) | |
681 | * | |
682 | * Returns 0 else error code | |
683 | */ | |
684 | int ab8500_fg_inst_curr_blocking(struct ab8500_fg *di) | |
685 | { | |
686 | int ret; | |
687 | int res = 0; | |
688 | ||
689 | ret = ab8500_fg_inst_curr_start(di); | |
690 | if (ret) { | |
691 | dev_err(di->dev, "Failed to initialize fg_inst\n"); | |
692 | return 0; | |
693 | } | |
694 | ||
695 | ret = ab8500_fg_inst_curr_finalize(di, &res); | |
696 | if (ret) { | |
697 | dev_err(di->dev, "Failed to finalize fg_inst\n"); | |
698 | return 0; | |
699 | } | |
700 | ||
701 | return res; | |
702 | } | |
703 | ||
704 | /** | |
705 | * ab8500_fg_acc_cur_work() - average battery current | |
706 | * @work: pointer to the work_struct structure | |
707 | * | |
708 | * Updated the average battery current obtained from the | |
709 | * coulomb counter. | |
710 | */ | |
711 | static void ab8500_fg_acc_cur_work(struct work_struct *work) | |
712 | { | |
713 | int val; | |
714 | int ret; | |
715 | u8 low, med, high; | |
716 | ||
717 | struct ab8500_fg *di = container_of(work, | |
718 | struct ab8500_fg, fg_acc_cur_work); | |
719 | ||
720 | mutex_lock(&di->cc_lock); | |
721 | ret = abx500_set_register_interruptible(di->dev, AB8500_GAS_GAUGE, | |
722 | AB8500_GASG_CC_NCOV_ACCU_CTRL, RD_NCONV_ACCU_REQ); | |
723 | if (ret) | |
724 | goto exit; | |
725 | ||
726 | ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE, | |
727 | AB8500_GASG_CC_NCOV_ACCU_LOW, &low); | |
728 | if (ret < 0) | |
729 | goto exit; | |
730 | ||
731 | ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE, | |
732 | AB8500_GASG_CC_NCOV_ACCU_MED, &med); | |
733 | if (ret < 0) | |
734 | goto exit; | |
735 | ||
736 | ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE, | |
737 | AB8500_GASG_CC_NCOV_ACCU_HIGH, &high); | |
738 | if (ret < 0) | |
739 | goto exit; | |
740 | ||
741 | /* Check for sign bit in case of negative value, 2's compliment */ | |
742 | if (high & 0x10) | |
743 | val = (low | (med << 8) | (high << 16) | 0xFFE00000); | |
744 | else | |
745 | val = (low | (med << 8) | (high << 16)); | |
746 | ||
747 | /* | |
748 | * Convert to uAh | |
749 | * Given a 250ms conversion cycle time the LSB corresponds | |
750 | * to 112.9 nAh. | |
751 | * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm | |
752 | */ | |
753 | di->accu_charge = (val * QLSB_NANO_AMP_HOURS_X10) / | |
754 | (100 * di->bat->fg_res); | |
755 | ||
756 | /* | |
757 | * Convert to unit value in mA | |
758 | * Full scale input voltage is | |
759 | * 66.660mV => LSB = 66.660mV/(4096*res) = 1.627mA | |
760 | * Given a 250ms conversion cycle time the LSB corresponds | |
761 | * to 112.9 nAh. Convert to current by dividing by the conversion | |
762 | * time in hours (= samples / (3600 * 4)h) | |
763 | * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm | |
764 | */ | |
765 | di->avg_curr = (val * QLSB_NANO_AMP_HOURS_X10 * 36) / | |
766 | (1000 * di->bat->fg_res * (di->fg_samples / 4)); | |
767 | ||
768 | di->flags.conv_done = true; | |
769 | ||
770 | mutex_unlock(&di->cc_lock); | |
771 | ||
772 | queue_work(di->fg_wq, &di->fg_work); | |
773 | ||
774 | return; | |
775 | exit: | |
776 | dev_err(di->dev, | |
777 | "Failed to read or write gas gauge registers\n"); | |
778 | mutex_unlock(&di->cc_lock); | |
779 | queue_work(di->fg_wq, &di->fg_work); | |
780 | } | |
781 | ||
782 | /** | |
783 | * ab8500_fg_bat_voltage() - get battery voltage | |
784 | * @di: pointer to the ab8500_fg structure | |
785 | * | |
786 | * Returns battery voltage(on success) else error code | |
787 | */ | |
788 | static int ab8500_fg_bat_voltage(struct ab8500_fg *di) | |
789 | { | |
790 | int vbat; | |
791 | static int prev; | |
792 | ||
793 | vbat = ab8500_gpadc_convert(di->gpadc, MAIN_BAT_V); | |
794 | if (vbat < 0) { | |
795 | dev_err(di->dev, | |
796 | "%s gpadc conversion failed, using previous value\n", | |
797 | __func__); | |
798 | return prev; | |
799 | } | |
800 | ||
801 | prev = vbat; | |
802 | return vbat; | |
803 | } | |
804 | ||
805 | /** | |
806 | * ab8500_fg_volt_to_capacity() - Voltage based capacity | |
807 | * @di: pointer to the ab8500_fg structure | |
808 | * @voltage: The voltage to convert to a capacity | |
809 | * | |
810 | * Returns battery capacity in per mille based on voltage | |
811 | */ | |
812 | static int ab8500_fg_volt_to_capacity(struct ab8500_fg *di, int voltage) | |
813 | { | |
814 | int i, tbl_size; | |
450ceb2b | 815 | struct abx500_v_to_cap *tbl; |
13151631 AM |
816 | int cap = 0; |
817 | ||
818 | tbl = di->bat->bat_type[di->bat->batt_id].v_to_cap_tbl, | |
819 | tbl_size = di->bat->bat_type[di->bat->batt_id].n_v_cap_tbl_elements; | |
820 | ||
821 | for (i = 0; i < tbl_size; ++i) { | |
822 | if (voltage > tbl[i].voltage) | |
823 | break; | |
824 | } | |
825 | ||
826 | if ((i > 0) && (i < tbl_size)) { | |
827 | cap = interpolate(voltage, | |
828 | tbl[i].voltage, | |
829 | tbl[i].capacity * 10, | |
830 | tbl[i-1].voltage, | |
831 | tbl[i-1].capacity * 10); | |
832 | } else if (i == 0) { | |
833 | cap = 1000; | |
834 | } else { | |
835 | cap = 0; | |
836 | } | |
837 | ||
838 | dev_dbg(di->dev, "%s Vbat: %d, Cap: %d per mille", | |
839 | __func__, voltage, cap); | |
840 | ||
841 | return cap; | |
842 | } | |
843 | ||
844 | /** | |
845 | * ab8500_fg_uncomp_volt_to_capacity() - Uncompensated voltage based capacity | |
846 | * @di: pointer to the ab8500_fg structure | |
847 | * | |
848 | * Returns battery capacity based on battery voltage that is not compensated | |
849 | * for the voltage drop due to the load | |
850 | */ | |
851 | static int ab8500_fg_uncomp_volt_to_capacity(struct ab8500_fg *di) | |
852 | { | |
853 | di->vbat = ab8500_fg_bat_voltage(di); | |
854 | return ab8500_fg_volt_to_capacity(di, di->vbat); | |
855 | } | |
856 | ||
857 | /** | |
858 | * ab8500_fg_battery_resistance() - Returns the battery inner resistance | |
859 | * @di: pointer to the ab8500_fg structure | |
860 | * | |
861 | * Returns battery inner resistance added with the fuel gauge resistor value | |
862 | * to get the total resistance in the whole link from gnd to bat+ node. | |
863 | */ | |
864 | static int ab8500_fg_battery_resistance(struct ab8500_fg *di) | |
865 | { | |
866 | int i, tbl_size; | |
867 | struct batres_vs_temp *tbl; | |
868 | int resist = 0; | |
869 | ||
870 | tbl = di->bat->bat_type[di->bat->batt_id].batres_tbl; | |
871 | tbl_size = di->bat->bat_type[di->bat->batt_id].n_batres_tbl_elements; | |
872 | ||
873 | for (i = 0; i < tbl_size; ++i) { | |
874 | if (di->bat_temp / 10 > tbl[i].temp) | |
875 | break; | |
876 | } | |
877 | ||
878 | if ((i > 0) && (i < tbl_size)) { | |
879 | resist = interpolate(di->bat_temp / 10, | |
880 | tbl[i].temp, | |
881 | tbl[i].resist, | |
882 | tbl[i-1].temp, | |
883 | tbl[i-1].resist); | |
884 | } else if (i == 0) { | |
885 | resist = tbl[0].resist; | |
886 | } else { | |
887 | resist = tbl[tbl_size - 1].resist; | |
888 | } | |
889 | ||
890 | dev_dbg(di->dev, "%s Temp: %d battery internal resistance: %d" | |
891 | " fg resistance %d, total: %d (mOhm)\n", | |
892 | __func__, di->bat_temp, resist, di->bat->fg_res / 10, | |
893 | (di->bat->fg_res / 10) + resist); | |
894 | ||
895 | /* fg_res variable is in 0.1mOhm */ | |
896 | resist += di->bat->fg_res / 10; | |
897 | ||
898 | return resist; | |
899 | } | |
900 | ||
901 | /** | |
902 | * ab8500_fg_load_comp_volt_to_capacity() - Load compensated voltage based capacity | |
903 | * @di: pointer to the ab8500_fg structure | |
904 | * | |
905 | * Returns battery capacity based on battery voltage that is load compensated | |
906 | * for the voltage drop | |
907 | */ | |
908 | static int ab8500_fg_load_comp_volt_to_capacity(struct ab8500_fg *di) | |
909 | { | |
910 | int vbat_comp, res; | |
911 | int i = 0; | |
912 | int vbat = 0; | |
913 | ||
914 | ab8500_fg_inst_curr_start(di); | |
915 | ||
916 | do { | |
917 | vbat += ab8500_fg_bat_voltage(di); | |
918 | i++; | |
919 | msleep(5); | |
920 | } while (!ab8500_fg_inst_curr_done(di)); | |
921 | ||
922 | ab8500_fg_inst_curr_finalize(di, &di->inst_curr); | |
923 | ||
924 | di->vbat = vbat / i; | |
925 | res = ab8500_fg_battery_resistance(di); | |
926 | ||
927 | /* Use Ohms law to get the load compensated voltage */ | |
928 | vbat_comp = di->vbat - (di->inst_curr * res) / 1000; | |
929 | ||
930 | dev_dbg(di->dev, "%s Measured Vbat: %dmV,Compensated Vbat %dmV, " | |
931 | "R: %dmOhm, Current: %dmA Vbat Samples: %d\n", | |
932 | __func__, di->vbat, vbat_comp, res, di->inst_curr, i); | |
933 | ||
934 | return ab8500_fg_volt_to_capacity(di, vbat_comp); | |
935 | } | |
936 | ||
937 | /** | |
938 | * ab8500_fg_convert_mah_to_permille() - Capacity in mAh to permille | |
939 | * @di: pointer to the ab8500_fg structure | |
940 | * @cap_mah: capacity in mAh | |
941 | * | |
942 | * Converts capacity in mAh to capacity in permille | |
943 | */ | |
944 | static int ab8500_fg_convert_mah_to_permille(struct ab8500_fg *di, int cap_mah) | |
945 | { | |
946 | return (cap_mah * 1000) / di->bat_cap.max_mah_design; | |
947 | } | |
948 | ||
949 | /** | |
950 | * ab8500_fg_convert_permille_to_mah() - Capacity in permille to mAh | |
951 | * @di: pointer to the ab8500_fg structure | |
952 | * @cap_pm: capacity in permille | |
953 | * | |
954 | * Converts capacity in permille to capacity in mAh | |
955 | */ | |
956 | static int ab8500_fg_convert_permille_to_mah(struct ab8500_fg *di, int cap_pm) | |
957 | { | |
958 | return cap_pm * di->bat_cap.max_mah_design / 1000; | |
959 | } | |
960 | ||
961 | /** | |
962 | * ab8500_fg_convert_mah_to_uwh() - Capacity in mAh to uWh | |
963 | * @di: pointer to the ab8500_fg structure | |
964 | * @cap_mah: capacity in mAh | |
965 | * | |
966 | * Converts capacity in mAh to capacity in uWh | |
967 | */ | |
968 | static int ab8500_fg_convert_mah_to_uwh(struct ab8500_fg *di, int cap_mah) | |
969 | { | |
970 | u64 div_res; | |
971 | u32 div_rem; | |
972 | ||
973 | div_res = ((u64) cap_mah) * ((u64) di->vbat_nom); | |
974 | div_rem = do_div(div_res, 1000); | |
975 | ||
976 | /* Make sure to round upwards if necessary */ | |
977 | if (div_rem >= 1000 / 2) | |
978 | div_res++; | |
979 | ||
980 | return (int) div_res; | |
981 | } | |
982 | ||
983 | /** | |
984 | * ab8500_fg_calc_cap_charging() - Calculate remaining capacity while charging | |
985 | * @di: pointer to the ab8500_fg structure | |
986 | * | |
987 | * Return the capacity in mAh based on previous calculated capcity and the FG | |
988 | * accumulator register value. The filter is filled with this capacity | |
989 | */ | |
990 | static int ab8500_fg_calc_cap_charging(struct ab8500_fg *di) | |
991 | { | |
992 | dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n", | |
993 | __func__, | |
994 | di->bat_cap.mah, | |
995 | di->accu_charge); | |
996 | ||
997 | /* Capacity should not be less than 0 */ | |
998 | if (di->bat_cap.mah + di->accu_charge > 0) | |
999 | di->bat_cap.mah += di->accu_charge; | |
1000 | else | |
1001 | di->bat_cap.mah = 0; | |
1002 | /* | |
1003 | * We force capacity to 100% once when the algorithm | |
1004 | * reports that it's full. | |
1005 | */ | |
1006 | if (di->bat_cap.mah >= di->bat_cap.max_mah_design || | |
1007 | di->flags.force_full) { | |
1008 | di->bat_cap.mah = di->bat_cap.max_mah_design; | |
1009 | } | |
1010 | ||
1011 | ab8500_fg_fill_cap_sample(di, di->bat_cap.mah); | |
1012 | di->bat_cap.permille = | |
1013 | ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah); | |
1014 | ||
1015 | /* We need to update battery voltage and inst current when charging */ | |
1016 | di->vbat = ab8500_fg_bat_voltage(di); | |
1017 | di->inst_curr = ab8500_fg_inst_curr_blocking(di); | |
1018 | ||
1019 | return di->bat_cap.mah; | |
1020 | } | |
1021 | ||
1022 | /** | |
1023 | * ab8500_fg_calc_cap_discharge_voltage() - Capacity in discharge with voltage | |
1024 | * @di: pointer to the ab8500_fg structure | |
1025 | * @comp: if voltage should be load compensated before capacity calc | |
1026 | * | |
1027 | * Return the capacity in mAh based on the battery voltage. The voltage can | |
1028 | * either be load compensated or not. This value is added to the filter and a | |
1029 | * new mean value is calculated and returned. | |
1030 | */ | |
1031 | static int ab8500_fg_calc_cap_discharge_voltage(struct ab8500_fg *di, bool comp) | |
1032 | { | |
1033 | int permille, mah; | |
1034 | ||
1035 | if (comp) | |
1036 | permille = ab8500_fg_load_comp_volt_to_capacity(di); | |
1037 | else | |
1038 | permille = ab8500_fg_uncomp_volt_to_capacity(di); | |
1039 | ||
1040 | mah = ab8500_fg_convert_permille_to_mah(di, permille); | |
1041 | ||
1042 | di->bat_cap.mah = ab8500_fg_add_cap_sample(di, mah); | |
1043 | di->bat_cap.permille = | |
1044 | ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah); | |
1045 | ||
1046 | return di->bat_cap.mah; | |
1047 | } | |
1048 | ||
1049 | /** | |
1050 | * ab8500_fg_calc_cap_discharge_fg() - Capacity in discharge with FG | |
1051 | * @di: pointer to the ab8500_fg structure | |
1052 | * | |
1053 | * Return the capacity in mAh based on previous calculated capcity and the FG | |
1054 | * accumulator register value. This value is added to the filter and a | |
1055 | * new mean value is calculated and returned. | |
1056 | */ | |
1057 | static int ab8500_fg_calc_cap_discharge_fg(struct ab8500_fg *di) | |
1058 | { | |
1059 | int permille_volt, permille; | |
1060 | ||
1061 | dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n", | |
1062 | __func__, | |
1063 | di->bat_cap.mah, | |
1064 | di->accu_charge); | |
1065 | ||
1066 | /* Capacity should not be less than 0 */ | |
1067 | if (di->bat_cap.mah + di->accu_charge > 0) | |
1068 | di->bat_cap.mah += di->accu_charge; | |
1069 | else | |
1070 | di->bat_cap.mah = 0; | |
1071 | ||
1072 | if (di->bat_cap.mah >= di->bat_cap.max_mah_design) | |
1073 | di->bat_cap.mah = di->bat_cap.max_mah_design; | |
1074 | ||
1075 | /* | |
1076 | * Check against voltage based capacity. It can not be lower | |
1077 | * than what the uncompensated voltage says | |
1078 | */ | |
1079 | permille = ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah); | |
1080 | permille_volt = ab8500_fg_uncomp_volt_to_capacity(di); | |
1081 | ||
1082 | if (permille < permille_volt) { | |
1083 | di->bat_cap.permille = permille_volt; | |
1084 | di->bat_cap.mah = ab8500_fg_convert_permille_to_mah(di, | |
1085 | di->bat_cap.permille); | |
1086 | ||
1087 | dev_dbg(di->dev, "%s voltage based: perm %d perm_volt %d\n", | |
1088 | __func__, | |
1089 | permille, | |
1090 | permille_volt); | |
1091 | ||
1092 | ab8500_fg_fill_cap_sample(di, di->bat_cap.mah); | |
1093 | } else { | |
1094 | ab8500_fg_fill_cap_sample(di, di->bat_cap.mah); | |
1095 | di->bat_cap.permille = | |
1096 | ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah); | |
1097 | } | |
1098 | ||
1099 | return di->bat_cap.mah; | |
1100 | } | |
1101 | ||
1102 | /** | |
1103 | * ab8500_fg_capacity_level() - Get the battery capacity level | |
1104 | * @di: pointer to the ab8500_fg structure | |
1105 | * | |
1106 | * Get the battery capacity level based on the capacity in percent | |
1107 | */ | |
1108 | static int ab8500_fg_capacity_level(struct ab8500_fg *di) | |
1109 | { | |
1110 | int ret, percent; | |
1111 | ||
1112 | percent = di->bat_cap.permille / 10; | |
1113 | ||
1114 | if (percent <= di->bat->cap_levels->critical || | |
1115 | di->flags.low_bat) | |
1116 | ret = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; | |
1117 | else if (percent <= di->bat->cap_levels->low) | |
1118 | ret = POWER_SUPPLY_CAPACITY_LEVEL_LOW; | |
1119 | else if (percent <= di->bat->cap_levels->normal) | |
1120 | ret = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; | |
1121 | else if (percent <= di->bat->cap_levels->high) | |
1122 | ret = POWER_SUPPLY_CAPACITY_LEVEL_HIGH; | |
1123 | else | |
1124 | ret = POWER_SUPPLY_CAPACITY_LEVEL_FULL; | |
1125 | ||
1126 | return ret; | |
1127 | } | |
1128 | ||
1129 | /** | |
1130 | * ab8500_fg_check_capacity_limits() - Check if capacity has changed | |
1131 | * @di: pointer to the ab8500_fg structure | |
1132 | * @init: capacity is allowed to go up in init mode | |
1133 | * | |
1134 | * Check if capacity or capacity limit has changed and notify the system | |
1135 | * about it using the power_supply framework | |
1136 | */ | |
1137 | static void ab8500_fg_check_capacity_limits(struct ab8500_fg *di, bool init) | |
1138 | { | |
1139 | bool changed = false; | |
1140 | ||
1141 | di->bat_cap.level = ab8500_fg_capacity_level(di); | |
1142 | ||
1143 | if (di->bat_cap.level != di->bat_cap.prev_level) { | |
1144 | /* | |
1145 | * We do not allow reported capacity level to go up | |
1146 | * unless we're charging or if we're in init | |
1147 | */ | |
1148 | if (!(!di->flags.charging && di->bat_cap.level > | |
1149 | di->bat_cap.prev_level) || init) { | |
1150 | dev_dbg(di->dev, "level changed from %d to %d\n", | |
1151 | di->bat_cap.prev_level, | |
1152 | di->bat_cap.level); | |
1153 | di->bat_cap.prev_level = di->bat_cap.level; | |
1154 | changed = true; | |
1155 | } else { | |
1156 | dev_dbg(di->dev, "level not allowed to go up " | |
1157 | "since no charger is connected: %d to %d\n", | |
1158 | di->bat_cap.prev_level, | |
1159 | di->bat_cap.level); | |
1160 | } | |
1161 | } | |
1162 | ||
1163 | /* | |
1164 | * If we have received the LOW_BAT IRQ, set capacity to 0 to initiate | |
1165 | * shutdown | |
1166 | */ | |
1167 | if (di->flags.low_bat) { | |
1168 | dev_dbg(di->dev, "Battery low, set capacity to 0\n"); | |
1169 | di->bat_cap.prev_percent = 0; | |
1170 | di->bat_cap.permille = 0; | |
1171 | di->bat_cap.prev_mah = 0; | |
1172 | di->bat_cap.mah = 0; | |
1173 | changed = true; | |
1174 | } else if (di->flags.fully_charged) { | |
1175 | /* | |
1176 | * We report 100% if algorithm reported fully charged | |
1177 | * unless capacity drops too much | |
1178 | */ | |
1179 | if (di->flags.force_full) { | |
1180 | di->bat_cap.prev_percent = di->bat_cap.permille / 10; | |
1181 | di->bat_cap.prev_mah = di->bat_cap.mah; | |
1182 | } else if (!di->flags.force_full && | |
1183 | di->bat_cap.prev_percent != | |
1184 | (di->bat_cap.permille) / 10 && | |
1185 | (di->bat_cap.permille / 10) < | |
1186 | di->bat->fg_params->maint_thres) { | |
1187 | dev_dbg(di->dev, | |
1188 | "battery reported full " | |
1189 | "but capacity dropping: %d\n", | |
1190 | di->bat_cap.permille / 10); | |
1191 | di->bat_cap.prev_percent = di->bat_cap.permille / 10; | |
1192 | di->bat_cap.prev_mah = di->bat_cap.mah; | |
1193 | ||
1194 | changed = true; | |
1195 | } | |
1196 | } else if (di->bat_cap.prev_percent != di->bat_cap.permille / 10) { | |
1197 | if (di->bat_cap.permille / 10 == 0) { | |
1198 | /* | |
1199 | * We will not report 0% unless we've got | |
1200 | * the LOW_BAT IRQ, no matter what the FG | |
1201 | * algorithm says. | |
1202 | */ | |
1203 | di->bat_cap.prev_percent = 1; | |
1204 | di->bat_cap.permille = 1; | |
1205 | di->bat_cap.prev_mah = 1; | |
1206 | di->bat_cap.mah = 1; | |
1207 | ||
1208 | changed = true; | |
1209 | } else if (!(!di->flags.charging && | |
1210 | (di->bat_cap.permille / 10) > | |
1211 | di->bat_cap.prev_percent) || init) { | |
1212 | /* | |
1213 | * We do not allow reported capacity to go up | |
1214 | * unless we're charging or if we're in init | |
1215 | */ | |
1216 | dev_dbg(di->dev, | |
1217 | "capacity changed from %d to %d (%d)\n", | |
1218 | di->bat_cap.prev_percent, | |
1219 | di->bat_cap.permille / 10, | |
1220 | di->bat_cap.permille); | |
1221 | di->bat_cap.prev_percent = di->bat_cap.permille / 10; | |
1222 | di->bat_cap.prev_mah = di->bat_cap.mah; | |
1223 | ||
1224 | changed = true; | |
1225 | } else { | |
1226 | dev_dbg(di->dev, "capacity not allowed to go up since " | |
1227 | "no charger is connected: %d to %d (%d)\n", | |
1228 | di->bat_cap.prev_percent, | |
1229 | di->bat_cap.permille / 10, | |
1230 | di->bat_cap.permille); | |
1231 | } | |
1232 | } | |
1233 | ||
1234 | if (changed) { | |
1235 | power_supply_changed(&di->fg_psy); | |
1236 | if (di->flags.fully_charged && di->flags.force_full) { | |
1237 | dev_dbg(di->dev, "Battery full, notifying.\n"); | |
1238 | di->flags.force_full = false; | |
1239 | sysfs_notify(&di->fg_kobject, NULL, "charge_full"); | |
1240 | } | |
1241 | sysfs_notify(&di->fg_kobject, NULL, "charge_now"); | |
1242 | } | |
1243 | } | |
1244 | ||
1245 | static void ab8500_fg_charge_state_to(struct ab8500_fg *di, | |
1246 | enum ab8500_fg_charge_state new_state) | |
1247 | { | |
1248 | dev_dbg(di->dev, "Charge state from %d [%s] to %d [%s]\n", | |
1249 | di->charge_state, | |
1250 | charge_state[di->charge_state], | |
1251 | new_state, | |
1252 | charge_state[new_state]); | |
1253 | ||
1254 | di->charge_state = new_state; | |
1255 | } | |
1256 | ||
1257 | static void ab8500_fg_discharge_state_to(struct ab8500_fg *di, | |
0fff22ee | 1258 | enum ab8500_fg_discharge_state new_state) |
13151631 AM |
1259 | { |
1260 | dev_dbg(di->dev, "Disharge state from %d [%s] to %d [%s]\n", | |
1261 | di->discharge_state, | |
1262 | discharge_state[di->discharge_state], | |
1263 | new_state, | |
1264 | discharge_state[new_state]); | |
1265 | ||
1266 | di->discharge_state = new_state; | |
1267 | } | |
1268 | ||
1269 | /** | |
1270 | * ab8500_fg_algorithm_charging() - FG algorithm for when charging | |
1271 | * @di: pointer to the ab8500_fg structure | |
1272 | * | |
1273 | * Battery capacity calculation state machine for when we're charging | |
1274 | */ | |
1275 | static void ab8500_fg_algorithm_charging(struct ab8500_fg *di) | |
1276 | { | |
1277 | /* | |
1278 | * If we change to discharge mode | |
1279 | * we should start with recovery | |
1280 | */ | |
1281 | if (di->discharge_state != AB8500_FG_DISCHARGE_INIT_RECOVERY) | |
1282 | ab8500_fg_discharge_state_to(di, | |
1283 | AB8500_FG_DISCHARGE_INIT_RECOVERY); | |
1284 | ||
1285 | switch (di->charge_state) { | |
1286 | case AB8500_FG_CHARGE_INIT: | |
1287 | di->fg_samples = SEC_TO_SAMPLE( | |
1288 | di->bat->fg_params->accu_charging); | |
1289 | ||
1290 | ab8500_fg_coulomb_counter(di, true); | |
1291 | ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_READOUT); | |
1292 | ||
1293 | break; | |
1294 | ||
1295 | case AB8500_FG_CHARGE_READOUT: | |
1296 | /* | |
1297 | * Read the FG and calculate the new capacity | |
1298 | */ | |
1299 | mutex_lock(&di->cc_lock); | |
1300 | if (!di->flags.conv_done) { | |
1301 | /* Wasn't the CC IRQ that got us here */ | |
1302 | mutex_unlock(&di->cc_lock); | |
1303 | dev_dbg(di->dev, "%s CC conv not done\n", | |
1304 | __func__); | |
1305 | ||
1306 | break; | |
1307 | } | |
1308 | di->flags.conv_done = false; | |
1309 | mutex_unlock(&di->cc_lock); | |
1310 | ||
1311 | ab8500_fg_calc_cap_charging(di); | |
1312 | ||
1313 | break; | |
1314 | ||
1315 | default: | |
1316 | break; | |
1317 | } | |
1318 | ||
1319 | /* Check capacity limits */ | |
1320 | ab8500_fg_check_capacity_limits(di, false); | |
1321 | } | |
1322 | ||
1323 | static void force_capacity(struct ab8500_fg *di) | |
1324 | { | |
1325 | int cap; | |
1326 | ||
1327 | ab8500_fg_clear_cap_samples(di); | |
1328 | cap = di->bat_cap.user_mah; | |
1329 | if (cap > di->bat_cap.max_mah_design) { | |
1330 | dev_dbg(di->dev, "Remaining cap %d can't be bigger than total" | |
1331 | " %d\n", cap, di->bat_cap.max_mah_design); | |
1332 | cap = di->bat_cap.max_mah_design; | |
1333 | } | |
1334 | ab8500_fg_fill_cap_sample(di, di->bat_cap.user_mah); | |
1335 | di->bat_cap.permille = ab8500_fg_convert_mah_to_permille(di, cap); | |
1336 | di->bat_cap.mah = cap; | |
1337 | ab8500_fg_check_capacity_limits(di, true); | |
1338 | } | |
1339 | ||
1340 | static bool check_sysfs_capacity(struct ab8500_fg *di) | |
1341 | { | |
1342 | int cap, lower, upper; | |
1343 | int cap_permille; | |
1344 | ||
1345 | cap = di->bat_cap.user_mah; | |
1346 | ||
1347 | cap_permille = ab8500_fg_convert_mah_to_permille(di, | |
1348 | di->bat_cap.user_mah); | |
1349 | ||
1350 | lower = di->bat_cap.permille - di->bat->fg_params->user_cap_limit * 10; | |
1351 | upper = di->bat_cap.permille + di->bat->fg_params->user_cap_limit * 10; | |
1352 | ||
1353 | if (lower < 0) | |
1354 | lower = 0; | |
1355 | /* 1000 is permille, -> 100 percent */ | |
1356 | if (upper > 1000) | |
1357 | upper = 1000; | |
1358 | ||
1359 | dev_dbg(di->dev, "Capacity limits:" | |
1360 | " (Lower: %d User: %d Upper: %d) [user: %d, was: %d]\n", | |
1361 | lower, cap_permille, upper, cap, di->bat_cap.mah); | |
1362 | ||
1363 | /* If within limits, use the saved capacity and exit estimation...*/ | |
1364 | if (cap_permille > lower && cap_permille < upper) { | |
1365 | dev_dbg(di->dev, "OK! Using users cap %d uAh now\n", cap); | |
1366 | force_capacity(di); | |
1367 | return true; | |
1368 | } | |
1369 | dev_dbg(di->dev, "Capacity from user out of limits, ignoring"); | |
1370 | return false; | |
1371 | } | |
1372 | ||
1373 | /** | |
1374 | * ab8500_fg_algorithm_discharging() - FG algorithm for when discharging | |
1375 | * @di: pointer to the ab8500_fg structure | |
1376 | * | |
1377 | * Battery capacity calculation state machine for when we're discharging | |
1378 | */ | |
1379 | static void ab8500_fg_algorithm_discharging(struct ab8500_fg *di) | |
1380 | { | |
1381 | int sleep_time; | |
1382 | ||
1383 | /* If we change to charge mode we should start with init */ | |
1384 | if (di->charge_state != AB8500_FG_CHARGE_INIT) | |
1385 | ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT); | |
1386 | ||
1387 | switch (di->discharge_state) { | |
1388 | case AB8500_FG_DISCHARGE_INIT: | |
1389 | /* We use the FG IRQ to work on */ | |
1390 | di->init_cnt = 0; | |
1391 | di->fg_samples = SEC_TO_SAMPLE(di->bat->fg_params->init_timer); | |
1392 | ab8500_fg_coulomb_counter(di, true); | |
1393 | ab8500_fg_discharge_state_to(di, | |
1394 | AB8500_FG_DISCHARGE_INITMEASURING); | |
1395 | ||
1396 | /* Intentional fallthrough */ | |
1397 | case AB8500_FG_DISCHARGE_INITMEASURING: | |
1398 | /* | |
1399 | * Discard a number of samples during startup. | |
1400 | * After that, use compensated voltage for a few | |
1401 | * samples to get an initial capacity. | |
1402 | * Then go to READOUT | |
1403 | */ | |
1404 | sleep_time = di->bat->fg_params->init_timer; | |
1405 | ||
1406 | /* Discard the first [x] seconds */ | |
1407 | if (di->init_cnt > | |
1408 | di->bat->fg_params->init_discard_time) { | |
1409 | ab8500_fg_calc_cap_discharge_voltage(di, true); | |
1410 | ||
1411 | ab8500_fg_check_capacity_limits(di, true); | |
1412 | } | |
1413 | ||
1414 | di->init_cnt += sleep_time; | |
1415 | if (di->init_cnt > di->bat->fg_params->init_total_time) | |
1416 | ab8500_fg_discharge_state_to(di, | |
1417 | AB8500_FG_DISCHARGE_READOUT_INIT); | |
1418 | ||
1419 | break; | |
1420 | ||
1421 | case AB8500_FG_DISCHARGE_INIT_RECOVERY: | |
1422 | di->recovery_cnt = 0; | |
1423 | di->recovery_needed = true; | |
1424 | ab8500_fg_discharge_state_to(di, | |
1425 | AB8500_FG_DISCHARGE_RECOVERY); | |
1426 | ||
1427 | /* Intentional fallthrough */ | |
1428 | ||
1429 | case AB8500_FG_DISCHARGE_RECOVERY: | |
1430 | sleep_time = di->bat->fg_params->recovery_sleep_timer; | |
1431 | ||
1432 | /* | |
1433 | * We should check the power consumption | |
1434 | * If low, go to READOUT (after x min) or | |
1435 | * RECOVERY_SLEEP if time left. | |
1436 | * If high, go to READOUT | |
1437 | */ | |
1438 | di->inst_curr = ab8500_fg_inst_curr_blocking(di); | |
1439 | ||
1440 | if (ab8500_fg_is_low_curr(di, di->inst_curr)) { | |
1441 | if (di->recovery_cnt > | |
1442 | di->bat->fg_params->recovery_total_time) { | |
1443 | di->fg_samples = SEC_TO_SAMPLE( | |
1444 | di->bat->fg_params->accu_high_curr); | |
1445 | ab8500_fg_coulomb_counter(di, true); | |
1446 | ab8500_fg_discharge_state_to(di, | |
1447 | AB8500_FG_DISCHARGE_READOUT); | |
1448 | di->recovery_needed = false; | |
1449 | } else { | |
1450 | queue_delayed_work(di->fg_wq, | |
1451 | &di->fg_periodic_work, | |
1452 | sleep_time * HZ); | |
1453 | } | |
1454 | di->recovery_cnt += sleep_time; | |
1455 | } else { | |
1456 | di->fg_samples = SEC_TO_SAMPLE( | |
1457 | di->bat->fg_params->accu_high_curr); | |
1458 | ab8500_fg_coulomb_counter(di, true); | |
1459 | ab8500_fg_discharge_state_to(di, | |
1460 | AB8500_FG_DISCHARGE_READOUT); | |
1461 | } | |
1462 | break; | |
1463 | ||
1464 | case AB8500_FG_DISCHARGE_READOUT_INIT: | |
1465 | di->fg_samples = SEC_TO_SAMPLE( | |
1466 | di->bat->fg_params->accu_high_curr); | |
1467 | ab8500_fg_coulomb_counter(di, true); | |
1468 | ab8500_fg_discharge_state_to(di, | |
1469 | AB8500_FG_DISCHARGE_READOUT); | |
1470 | break; | |
1471 | ||
1472 | case AB8500_FG_DISCHARGE_READOUT: | |
1473 | di->inst_curr = ab8500_fg_inst_curr_blocking(di); | |
1474 | ||
1475 | if (ab8500_fg_is_low_curr(di, di->inst_curr)) { | |
1476 | /* Detect mode change */ | |
1477 | if (di->high_curr_mode) { | |
1478 | di->high_curr_mode = false; | |
1479 | di->high_curr_cnt = 0; | |
1480 | } | |
1481 | ||
1482 | if (di->recovery_needed) { | |
1483 | ab8500_fg_discharge_state_to(di, | |
1484 | AB8500_FG_DISCHARGE_RECOVERY); | |
1485 | ||
1486 | queue_delayed_work(di->fg_wq, | |
1487 | &di->fg_periodic_work, 0); | |
1488 | ||
1489 | break; | |
1490 | } | |
1491 | ||
1492 | ab8500_fg_calc_cap_discharge_voltage(di, true); | |
1493 | } else { | |
1494 | mutex_lock(&di->cc_lock); | |
1495 | if (!di->flags.conv_done) { | |
1496 | /* Wasn't the CC IRQ that got us here */ | |
1497 | mutex_unlock(&di->cc_lock); | |
1498 | dev_dbg(di->dev, "%s CC conv not done\n", | |
1499 | __func__); | |
1500 | ||
1501 | break; | |
1502 | } | |
1503 | di->flags.conv_done = false; | |
1504 | mutex_unlock(&di->cc_lock); | |
1505 | ||
1506 | /* Detect mode change */ | |
1507 | if (!di->high_curr_mode) { | |
1508 | di->high_curr_mode = true; | |
1509 | di->high_curr_cnt = 0; | |
1510 | } | |
1511 | ||
1512 | di->high_curr_cnt += | |
1513 | di->bat->fg_params->accu_high_curr; | |
1514 | if (di->high_curr_cnt > | |
1515 | di->bat->fg_params->high_curr_time) | |
1516 | di->recovery_needed = true; | |
1517 | ||
1518 | ab8500_fg_calc_cap_discharge_fg(di); | |
1519 | } | |
1520 | ||
1521 | ab8500_fg_check_capacity_limits(di, false); | |
1522 | ||
1523 | break; | |
1524 | ||
1525 | case AB8500_FG_DISCHARGE_WAKEUP: | |
1526 | ab8500_fg_coulomb_counter(di, true); | |
1527 | di->inst_curr = ab8500_fg_inst_curr_blocking(di); | |
1528 | ||
1529 | ab8500_fg_calc_cap_discharge_voltage(di, true); | |
1530 | ||
1531 | di->fg_samples = SEC_TO_SAMPLE( | |
1532 | di->bat->fg_params->accu_high_curr); | |
1533 | ab8500_fg_coulomb_counter(di, true); | |
1534 | ab8500_fg_discharge_state_to(di, | |
1535 | AB8500_FG_DISCHARGE_READOUT); | |
1536 | ||
1537 | ab8500_fg_check_capacity_limits(di, false); | |
1538 | ||
1539 | break; | |
1540 | ||
1541 | default: | |
1542 | break; | |
1543 | } | |
1544 | } | |
1545 | ||
1546 | /** | |
1547 | * ab8500_fg_algorithm_calibrate() - Internal columb counter offset calibration | |
1548 | * @di: pointer to the ab8500_fg structure | |
1549 | * | |
1550 | */ | |
1551 | static void ab8500_fg_algorithm_calibrate(struct ab8500_fg *di) | |
1552 | { | |
1553 | int ret; | |
1554 | ||
1555 | switch (di->calib_state) { | |
1556 | case AB8500_FG_CALIB_INIT: | |
1557 | dev_dbg(di->dev, "Calibration ongoing...\n"); | |
1558 | ||
1559 | ret = abx500_mask_and_set_register_interruptible(di->dev, | |
1560 | AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, | |
1561 | CC_INT_CAL_N_AVG_MASK, CC_INT_CAL_SAMPLES_8); | |
1562 | if (ret < 0) | |
1563 | goto err; | |
1564 | ||
1565 | ret = abx500_mask_and_set_register_interruptible(di->dev, | |
1566 | AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, | |
1567 | CC_INTAVGOFFSET_ENA, CC_INTAVGOFFSET_ENA); | |
1568 | if (ret < 0) | |
1569 | goto err; | |
1570 | di->calib_state = AB8500_FG_CALIB_WAIT; | |
1571 | break; | |
1572 | case AB8500_FG_CALIB_END: | |
1573 | ret = abx500_mask_and_set_register_interruptible(di->dev, | |
1574 | AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, | |
1575 | CC_MUXOFFSET, CC_MUXOFFSET); | |
1576 | if (ret < 0) | |
1577 | goto err; | |
1578 | di->flags.calibrate = false; | |
1579 | dev_dbg(di->dev, "Calibration done...\n"); | |
1580 | queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); | |
1581 | break; | |
1582 | case AB8500_FG_CALIB_WAIT: | |
1583 | dev_dbg(di->dev, "Calibration WFI\n"); | |
1584 | default: | |
1585 | break; | |
1586 | } | |
1587 | return; | |
1588 | err: | |
1589 | /* Something went wrong, don't calibrate then */ | |
1590 | dev_err(di->dev, "failed to calibrate the CC\n"); | |
1591 | di->flags.calibrate = false; | |
1592 | di->calib_state = AB8500_FG_CALIB_INIT; | |
1593 | queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); | |
1594 | } | |
1595 | ||
1596 | /** | |
1597 | * ab8500_fg_algorithm() - Entry point for the FG algorithm | |
1598 | * @di: pointer to the ab8500_fg structure | |
1599 | * | |
1600 | * Entry point for the battery capacity calculation state machine | |
1601 | */ | |
1602 | static void ab8500_fg_algorithm(struct ab8500_fg *di) | |
1603 | { | |
1604 | if (di->flags.calibrate) | |
1605 | ab8500_fg_algorithm_calibrate(di); | |
1606 | else { | |
1607 | if (di->flags.charging) | |
1608 | ab8500_fg_algorithm_charging(di); | |
1609 | else | |
1610 | ab8500_fg_algorithm_discharging(di); | |
1611 | } | |
1612 | ||
1613 | dev_dbg(di->dev, "[FG_DATA] %d %d %d %d %d %d %d %d %d " | |
1614 | "%d %d %d %d %d %d %d\n", | |
1615 | di->bat_cap.max_mah_design, | |
1616 | di->bat_cap.mah, | |
1617 | di->bat_cap.permille, | |
1618 | di->bat_cap.level, | |
1619 | di->bat_cap.prev_mah, | |
1620 | di->bat_cap.prev_percent, | |
1621 | di->bat_cap.prev_level, | |
1622 | di->vbat, | |
1623 | di->inst_curr, | |
1624 | di->avg_curr, | |
1625 | di->accu_charge, | |
1626 | di->flags.charging, | |
1627 | di->charge_state, | |
1628 | di->discharge_state, | |
1629 | di->high_curr_mode, | |
1630 | di->recovery_needed); | |
1631 | } | |
1632 | ||
1633 | /** | |
1634 | * ab8500_fg_periodic_work() - Run the FG state machine periodically | |
1635 | * @work: pointer to the work_struct structure | |
1636 | * | |
1637 | * Work queue function for periodic work | |
1638 | */ | |
1639 | static void ab8500_fg_periodic_work(struct work_struct *work) | |
1640 | { | |
1641 | struct ab8500_fg *di = container_of(work, struct ab8500_fg, | |
1642 | fg_periodic_work.work); | |
1643 | ||
1644 | if (di->init_capacity) { | |
1645 | /* A dummy read that will return 0 */ | |
1646 | di->inst_curr = ab8500_fg_inst_curr_blocking(di); | |
1647 | /* Get an initial capacity calculation */ | |
1648 | ab8500_fg_calc_cap_discharge_voltage(di, true); | |
1649 | ab8500_fg_check_capacity_limits(di, true); | |
1650 | di->init_capacity = false; | |
1651 | ||
1652 | queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); | |
1653 | } else if (di->flags.user_cap) { | |
1654 | if (check_sysfs_capacity(di)) { | |
1655 | ab8500_fg_check_capacity_limits(di, true); | |
1656 | if (di->flags.charging) | |
1657 | ab8500_fg_charge_state_to(di, | |
1658 | AB8500_FG_CHARGE_INIT); | |
1659 | else | |
1660 | ab8500_fg_discharge_state_to(di, | |
1661 | AB8500_FG_DISCHARGE_READOUT_INIT); | |
1662 | } | |
1663 | di->flags.user_cap = false; | |
1664 | queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); | |
1665 | } else | |
1666 | ab8500_fg_algorithm(di); | |
1667 | ||
1668 | } | |
1669 | ||
1670 | /** | |
1671 | * ab8500_fg_check_hw_failure_work() - Check OVV_BAT condition | |
1672 | * @work: pointer to the work_struct structure | |
1673 | * | |
1674 | * Work queue function for checking the OVV_BAT condition | |
1675 | */ | |
1676 | static void ab8500_fg_check_hw_failure_work(struct work_struct *work) | |
1677 | { | |
1678 | int ret; | |
1679 | u8 reg_value; | |
1680 | ||
1681 | struct ab8500_fg *di = container_of(work, struct ab8500_fg, | |
1682 | fg_check_hw_failure_work.work); | |
1683 | ||
1684 | /* | |
1685 | * If we have had a battery over-voltage situation, | |
1686 | * check ovv-bit to see if it should be reset. | |
1687 | */ | |
1688 | if (di->flags.bat_ovv) { | |
1689 | ret = abx500_get_register_interruptible(di->dev, | |
1690 | AB8500_CHARGER, AB8500_CH_STAT_REG, | |
1691 | ®_value); | |
1692 | if (ret < 0) { | |
1693 | dev_err(di->dev, "%s ab8500 read failed\n", __func__); | |
1694 | return; | |
1695 | } | |
1696 | if ((reg_value & BATT_OVV) != BATT_OVV) { | |
1697 | dev_dbg(di->dev, "Battery recovered from OVV\n"); | |
1698 | di->flags.bat_ovv = false; | |
1699 | power_supply_changed(&di->fg_psy); | |
1700 | return; | |
1701 | } | |
1702 | ||
1703 | /* Not yet recovered from ovv, reschedule this test */ | |
1704 | queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work, | |
1705 | round_jiffies(HZ)); | |
1706 | } | |
1707 | } | |
1708 | ||
1709 | /** | |
1710 | * ab8500_fg_low_bat_work() - Check LOW_BAT condition | |
1711 | * @work: pointer to the work_struct structure | |
1712 | * | |
1713 | * Work queue function for checking the LOW_BAT condition | |
1714 | */ | |
1715 | static void ab8500_fg_low_bat_work(struct work_struct *work) | |
1716 | { | |
1717 | int vbat; | |
1718 | ||
1719 | struct ab8500_fg *di = container_of(work, struct ab8500_fg, | |
1720 | fg_low_bat_work.work); | |
1721 | ||
1722 | vbat = ab8500_fg_bat_voltage(di); | |
1723 | ||
1724 | /* Check if LOW_BAT still fulfilled */ | |
1725 | if (vbat < di->bat->fg_params->lowbat_threshold) { | |
1726 | di->flags.low_bat = true; | |
1727 | dev_warn(di->dev, "Battery voltage still LOW\n"); | |
1728 | ||
1729 | /* | |
1730 | * We need to re-schedule this check to be able to detect | |
1731 | * if the voltage increases again during charging | |
1732 | */ | |
1733 | queue_delayed_work(di->fg_wq, &di->fg_low_bat_work, | |
1734 | round_jiffies(LOW_BAT_CHECK_INTERVAL)); | |
1735 | } else { | |
1736 | di->flags.low_bat = false; | |
1737 | dev_warn(di->dev, "Battery voltage OK again\n"); | |
1738 | } | |
1739 | ||
1740 | /* This is needed to dispatch LOW_BAT */ | |
1741 | ab8500_fg_check_capacity_limits(di, false); | |
1742 | ||
1743 | /* Set this flag to check if LOW_BAT IRQ still occurs */ | |
1744 | di->flags.low_bat_delay = false; | |
1745 | } | |
1746 | ||
1747 | /** | |
1748 | * ab8500_fg_battok_calc - calculate the bit pattern corresponding | |
1749 | * to the target voltage. | |
1750 | * @di: pointer to the ab8500_fg structure | |
1751 | * @target target voltage | |
1752 | * | |
1753 | * Returns bit pattern closest to the target voltage | |
1754 | * valid return values are 0-14. (0-BATT_OK_MAX_NR_INCREMENTS) | |
1755 | */ | |
1756 | ||
1757 | static int ab8500_fg_battok_calc(struct ab8500_fg *di, int target) | |
1758 | { | |
1759 | if (target > BATT_OK_MIN + | |
1760 | (BATT_OK_INCREMENT * BATT_OK_MAX_NR_INCREMENTS)) | |
1761 | return BATT_OK_MAX_NR_INCREMENTS; | |
1762 | if (target < BATT_OK_MIN) | |
1763 | return 0; | |
1764 | return (target - BATT_OK_MIN) / BATT_OK_INCREMENT; | |
1765 | } | |
1766 | ||
1767 | /** | |
1768 | * ab8500_fg_battok_init_hw_register - init battok levels | |
1769 | * @di: pointer to the ab8500_fg structure | |
1770 | * | |
1771 | */ | |
1772 | ||
1773 | static int ab8500_fg_battok_init_hw_register(struct ab8500_fg *di) | |
1774 | { | |
1775 | int selected; | |
1776 | int sel0; | |
1777 | int sel1; | |
1778 | int cbp_sel0; | |
1779 | int cbp_sel1; | |
1780 | int ret; | |
1781 | int new_val; | |
1782 | ||
1783 | sel0 = di->bat->fg_params->battok_falling_th_sel0; | |
1784 | sel1 = di->bat->fg_params->battok_raising_th_sel1; | |
1785 | ||
1786 | cbp_sel0 = ab8500_fg_battok_calc(di, sel0); | |
1787 | cbp_sel1 = ab8500_fg_battok_calc(di, sel1); | |
1788 | ||
1789 | selected = BATT_OK_MIN + cbp_sel0 * BATT_OK_INCREMENT; | |
1790 | ||
1791 | if (selected != sel0) | |
1792 | dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n", | |
1793 | sel0, selected, cbp_sel0); | |
1794 | ||
1795 | selected = BATT_OK_MIN + cbp_sel1 * BATT_OK_INCREMENT; | |
1796 | ||
1797 | if (selected != sel1) | |
1798 | dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n", | |
1799 | sel1, selected, cbp_sel1); | |
1800 | ||
1801 | new_val = cbp_sel0 | (cbp_sel1 << 4); | |
1802 | ||
1803 | dev_dbg(di->dev, "using: %x %d %d\n", new_val, cbp_sel0, cbp_sel1); | |
1804 | ret = abx500_set_register_interruptible(di->dev, AB8500_SYS_CTRL2_BLOCK, | |
1805 | AB8500_BATT_OK_REG, new_val); | |
1806 | return ret; | |
1807 | } | |
1808 | ||
1809 | /** | |
1810 | * ab8500_fg_instant_work() - Run the FG state machine instantly | |
1811 | * @work: pointer to the work_struct structure | |
1812 | * | |
1813 | * Work queue function for instant work | |
1814 | */ | |
1815 | static void ab8500_fg_instant_work(struct work_struct *work) | |
1816 | { | |
1817 | struct ab8500_fg *di = container_of(work, struct ab8500_fg, fg_work); | |
1818 | ||
1819 | ab8500_fg_algorithm(di); | |
1820 | } | |
1821 | ||
1822 | /** | |
1823 | * ab8500_fg_cc_data_end_handler() - isr to get battery avg current. | |
1824 | * @irq: interrupt number | |
1825 | * @_di: pointer to the ab8500_fg structure | |
1826 | * | |
1827 | * Returns IRQ status(IRQ_HANDLED) | |
1828 | */ | |
1829 | static irqreturn_t ab8500_fg_cc_data_end_handler(int irq, void *_di) | |
1830 | { | |
1831 | struct ab8500_fg *di = _di; | |
1832 | complete(&di->ab8500_fg_complete); | |
1833 | return IRQ_HANDLED; | |
1834 | } | |
1835 | ||
1836 | /** | |
1837 | * ab8500_fg_cc_convend_handler() - isr to get battery avg current. | |
1838 | * @irq: interrupt number | |
1839 | * @_di: pointer to the ab8500_fg structure | |
1840 | * | |
1841 | * Returns IRQ status(IRQ_HANDLED) | |
1842 | */ | |
1843 | static irqreturn_t ab8500_fg_cc_int_calib_handler(int irq, void *_di) | |
1844 | { | |
1845 | struct ab8500_fg *di = _di; | |
1846 | di->calib_state = AB8500_FG_CALIB_END; | |
1847 | queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); | |
1848 | return IRQ_HANDLED; | |
1849 | } | |
1850 | ||
1851 | /** | |
1852 | * ab8500_fg_cc_convend_handler() - isr to get battery avg current. | |
1853 | * @irq: interrupt number | |
1854 | * @_di: pointer to the ab8500_fg structure | |
1855 | * | |
1856 | * Returns IRQ status(IRQ_HANDLED) | |
1857 | */ | |
1858 | static irqreturn_t ab8500_fg_cc_convend_handler(int irq, void *_di) | |
1859 | { | |
1860 | struct ab8500_fg *di = _di; | |
1861 | ||
1862 | queue_work(di->fg_wq, &di->fg_acc_cur_work); | |
1863 | ||
1864 | return IRQ_HANDLED; | |
1865 | } | |
1866 | ||
1867 | /** | |
1868 | * ab8500_fg_batt_ovv_handler() - Battery OVV occured | |
1869 | * @irq: interrupt number | |
1870 | * @_di: pointer to the ab8500_fg structure | |
1871 | * | |
1872 | * Returns IRQ status(IRQ_HANDLED) | |
1873 | */ | |
1874 | static irqreturn_t ab8500_fg_batt_ovv_handler(int irq, void *_di) | |
1875 | { | |
1876 | struct ab8500_fg *di = _di; | |
1877 | ||
1878 | dev_dbg(di->dev, "Battery OVV\n"); | |
1879 | di->flags.bat_ovv = true; | |
1880 | power_supply_changed(&di->fg_psy); | |
1881 | ||
1882 | /* Schedule a new HW failure check */ | |
1883 | queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work, 0); | |
1884 | ||
1885 | return IRQ_HANDLED; | |
1886 | } | |
1887 | ||
1888 | /** | |
1889 | * ab8500_fg_lowbatf_handler() - Battery voltage is below LOW threshold | |
1890 | * @irq: interrupt number | |
1891 | * @_di: pointer to the ab8500_fg structure | |
1892 | * | |
1893 | * Returns IRQ status(IRQ_HANDLED) | |
1894 | */ | |
1895 | static irqreturn_t ab8500_fg_lowbatf_handler(int irq, void *_di) | |
1896 | { | |
1897 | struct ab8500_fg *di = _di; | |
1898 | ||
1899 | if (!di->flags.low_bat_delay) { | |
1900 | dev_warn(di->dev, "Battery voltage is below LOW threshold\n"); | |
1901 | di->flags.low_bat_delay = true; | |
1902 | /* | |
1903 | * Start a timer to check LOW_BAT again after some time | |
1904 | * This is done to avoid shutdown on single voltage dips | |
1905 | */ | |
1906 | queue_delayed_work(di->fg_wq, &di->fg_low_bat_work, | |
1907 | round_jiffies(LOW_BAT_CHECK_INTERVAL)); | |
1908 | } | |
1909 | return IRQ_HANDLED; | |
1910 | } | |
1911 | ||
1912 | /** | |
1913 | * ab8500_fg_get_property() - get the fg properties | |
1914 | * @psy: pointer to the power_supply structure | |
1915 | * @psp: pointer to the power_supply_property structure | |
1916 | * @val: pointer to the power_supply_propval union | |
1917 | * | |
1918 | * This function gets called when an application tries to get the | |
1919 | * fg properties by reading the sysfs files. | |
1920 | * voltage_now: battery voltage | |
1921 | * current_now: battery instant current | |
1922 | * current_avg: battery average current | |
1923 | * charge_full_design: capacity where battery is considered full | |
1924 | * charge_now: battery capacity in nAh | |
1925 | * capacity: capacity in percent | |
1926 | * capacity_level: capacity level | |
1927 | * | |
1928 | * Returns error code in case of failure else 0 on success | |
1929 | */ | |
1930 | static int ab8500_fg_get_property(struct power_supply *psy, | |
1931 | enum power_supply_property psp, | |
1932 | union power_supply_propval *val) | |
1933 | { | |
1934 | struct ab8500_fg *di; | |
1935 | ||
1936 | di = to_ab8500_fg_device_info(psy); | |
1937 | ||
1938 | /* | |
1939 | * If battery is identified as unknown and charging of unknown | |
1940 | * batteries is disabled, we always report 100% capacity and | |
1941 | * capacity level UNKNOWN, since we can't calculate | |
1942 | * remaining capacity | |
1943 | */ | |
1944 | ||
1945 | switch (psp) { | |
1946 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
1947 | if (di->flags.bat_ovv) | |
1948 | val->intval = BATT_OVV_VALUE * 1000; | |
1949 | else | |
1950 | val->intval = di->vbat * 1000; | |
1951 | break; | |
1952 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
1953 | val->intval = di->inst_curr * 1000; | |
1954 | break; | |
1955 | case POWER_SUPPLY_PROP_CURRENT_AVG: | |
1956 | val->intval = di->avg_curr * 1000; | |
1957 | break; | |
1958 | case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: | |
1959 | val->intval = ab8500_fg_convert_mah_to_uwh(di, | |
1960 | di->bat_cap.max_mah_design); | |
1961 | break; | |
1962 | case POWER_SUPPLY_PROP_ENERGY_FULL: | |
1963 | val->intval = ab8500_fg_convert_mah_to_uwh(di, | |
1964 | di->bat_cap.max_mah); | |
1965 | break; | |
1966 | case POWER_SUPPLY_PROP_ENERGY_NOW: | |
1967 | if (di->flags.batt_unknown && !di->bat->chg_unknown_bat && | |
1968 | di->flags.batt_id_received) | |
1969 | val->intval = ab8500_fg_convert_mah_to_uwh(di, | |
1970 | di->bat_cap.max_mah); | |
1971 | else | |
1972 | val->intval = ab8500_fg_convert_mah_to_uwh(di, | |
1973 | di->bat_cap.prev_mah); | |
1974 | break; | |
1975 | case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: | |
1976 | val->intval = di->bat_cap.max_mah_design; | |
1977 | break; | |
1978 | case POWER_SUPPLY_PROP_CHARGE_FULL: | |
1979 | val->intval = di->bat_cap.max_mah; | |
1980 | break; | |
1981 | case POWER_SUPPLY_PROP_CHARGE_NOW: | |
1982 | if (di->flags.batt_unknown && !di->bat->chg_unknown_bat && | |
1983 | di->flags.batt_id_received) | |
1984 | val->intval = di->bat_cap.max_mah; | |
1985 | else | |
1986 | val->intval = di->bat_cap.prev_mah; | |
1987 | break; | |
1988 | case POWER_SUPPLY_PROP_CAPACITY: | |
1989 | if (di->flags.batt_unknown && !di->bat->chg_unknown_bat && | |
1990 | di->flags.batt_id_received) | |
1991 | val->intval = 100; | |
1992 | else | |
1993 | val->intval = di->bat_cap.prev_percent; | |
1994 | break; | |
1995 | case POWER_SUPPLY_PROP_CAPACITY_LEVEL: | |
1996 | if (di->flags.batt_unknown && !di->bat->chg_unknown_bat && | |
1997 | di->flags.batt_id_received) | |
1998 | val->intval = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN; | |
1999 | else | |
2000 | val->intval = di->bat_cap.prev_level; | |
2001 | break; | |
2002 | default: | |
2003 | return -EINVAL; | |
2004 | } | |
2005 | return 0; | |
2006 | } | |
2007 | ||
2008 | static int ab8500_fg_get_ext_psy_data(struct device *dev, void *data) | |
2009 | { | |
2010 | struct power_supply *psy; | |
2011 | struct power_supply *ext; | |
2012 | struct ab8500_fg *di; | |
2013 | union power_supply_propval ret; | |
2014 | int i, j; | |
2015 | bool psy_found = false; | |
2016 | ||
2017 | psy = (struct power_supply *)data; | |
2018 | ext = dev_get_drvdata(dev); | |
2019 | di = to_ab8500_fg_device_info(psy); | |
2020 | ||
2021 | /* | |
2022 | * For all psy where the name of your driver | |
2023 | * appears in any supplied_to | |
2024 | */ | |
2025 | for (i = 0; i < ext->num_supplicants; i++) { | |
2026 | if (!strcmp(ext->supplied_to[i], psy->name)) | |
2027 | psy_found = true; | |
2028 | } | |
2029 | ||
2030 | if (!psy_found) | |
2031 | return 0; | |
2032 | ||
2033 | /* Go through all properties for the psy */ | |
2034 | for (j = 0; j < ext->num_properties; j++) { | |
2035 | enum power_supply_property prop; | |
2036 | prop = ext->properties[j]; | |
2037 | ||
2038 | if (ext->get_property(ext, prop, &ret)) | |
2039 | continue; | |
2040 | ||
2041 | switch (prop) { | |
2042 | case POWER_SUPPLY_PROP_STATUS: | |
2043 | switch (ext->type) { | |
2044 | case POWER_SUPPLY_TYPE_BATTERY: | |
2045 | switch (ret.intval) { | |
2046 | case POWER_SUPPLY_STATUS_UNKNOWN: | |
2047 | case POWER_SUPPLY_STATUS_DISCHARGING: | |
2048 | case POWER_SUPPLY_STATUS_NOT_CHARGING: | |
2049 | if (!di->flags.charging) | |
2050 | break; | |
2051 | di->flags.charging = false; | |
2052 | di->flags.fully_charged = false; | |
2053 | queue_work(di->fg_wq, &di->fg_work); | |
2054 | break; | |
2055 | case POWER_SUPPLY_STATUS_FULL: | |
2056 | if (di->flags.fully_charged) | |
2057 | break; | |
2058 | di->flags.fully_charged = true; | |
2059 | di->flags.force_full = true; | |
2060 | /* Save current capacity as maximum */ | |
2061 | di->bat_cap.max_mah = di->bat_cap.mah; | |
2062 | queue_work(di->fg_wq, &di->fg_work); | |
2063 | break; | |
2064 | case POWER_SUPPLY_STATUS_CHARGING: | |
2065 | if (di->flags.charging) | |
2066 | break; | |
2067 | di->flags.charging = true; | |
2068 | di->flags.fully_charged = false; | |
2069 | queue_work(di->fg_wq, &di->fg_work); | |
2070 | break; | |
2071 | }; | |
2072 | default: | |
2073 | break; | |
2074 | }; | |
2075 | break; | |
2076 | case POWER_SUPPLY_PROP_TECHNOLOGY: | |
2077 | switch (ext->type) { | |
2078 | case POWER_SUPPLY_TYPE_BATTERY: | |
2079 | if (!di->flags.batt_id_received) { | |
c34a61b4 AV |
2080 | const struct abx500_battery_type *b; |
2081 | ||
13151631 AM |
2082 | b = &(di->bat->bat_type[di->bat->batt_id]); |
2083 | ||
2084 | di->flags.batt_id_received = true; | |
2085 | ||
2086 | di->bat_cap.max_mah_design = | |
2087 | MILLI_TO_MICRO * | |
2088 | b->charge_full_design; | |
2089 | ||
2090 | di->bat_cap.max_mah = | |
2091 | di->bat_cap.max_mah_design; | |
2092 | ||
2093 | di->vbat_nom = b->nominal_voltage; | |
2094 | } | |
2095 | ||
2096 | if (ret.intval) | |
2097 | di->flags.batt_unknown = false; | |
2098 | else | |
2099 | di->flags.batt_unknown = true; | |
2100 | break; | |
2101 | default: | |
2102 | break; | |
2103 | } | |
2104 | break; | |
2105 | case POWER_SUPPLY_PROP_TEMP: | |
2106 | switch (ext->type) { | |
2107 | case POWER_SUPPLY_TYPE_BATTERY: | |
2108 | if (di->flags.batt_id_received) | |
2109 | di->bat_temp = ret.intval; | |
2110 | break; | |
2111 | default: | |
2112 | break; | |
2113 | } | |
2114 | break; | |
2115 | default: | |
2116 | break; | |
2117 | } | |
2118 | } | |
2119 | return 0; | |
2120 | } | |
2121 | ||
2122 | /** | |
2123 | * ab8500_fg_init_hw_registers() - Set up FG related registers | |
2124 | * @di: pointer to the ab8500_fg structure | |
2125 | * | |
2126 | * Set up battery OVV, low battery voltage registers | |
2127 | */ | |
2128 | static int ab8500_fg_init_hw_registers(struct ab8500_fg *di) | |
2129 | { | |
2130 | int ret; | |
2131 | ||
2132 | /* Set VBAT OVV threshold */ | |
2133 | ret = abx500_mask_and_set_register_interruptible(di->dev, | |
2134 | AB8500_CHARGER, | |
2135 | AB8500_BATT_OVV, | |
2136 | BATT_OVV_TH_4P75, | |
2137 | BATT_OVV_TH_4P75); | |
2138 | if (ret) { | |
2139 | dev_err(di->dev, "failed to set BATT_OVV\n"); | |
2140 | goto out; | |
2141 | } | |
2142 | ||
2143 | /* Enable VBAT OVV detection */ | |
2144 | ret = abx500_mask_and_set_register_interruptible(di->dev, | |
2145 | AB8500_CHARGER, | |
2146 | AB8500_BATT_OVV, | |
2147 | BATT_OVV_ENA, | |
2148 | BATT_OVV_ENA); | |
2149 | if (ret) { | |
2150 | dev_err(di->dev, "failed to enable BATT_OVV\n"); | |
2151 | goto out; | |
2152 | } | |
2153 | ||
2154 | /* Low Battery Voltage */ | |
2155 | ret = abx500_set_register_interruptible(di->dev, | |
2156 | AB8500_SYS_CTRL2_BLOCK, | |
2157 | AB8500_LOW_BAT_REG, | |
2158 | ab8500_volt_to_regval( | |
2159 | di->bat->fg_params->lowbat_threshold) << 1 | | |
2160 | LOW_BAT_ENABLE); | |
2161 | if (ret) { | |
2162 | dev_err(di->dev, "%s write failed\n", __func__); | |
2163 | goto out; | |
2164 | } | |
2165 | ||
2166 | /* Battery OK threshold */ | |
2167 | ret = ab8500_fg_battok_init_hw_register(di); | |
2168 | if (ret) { | |
2169 | dev_err(di->dev, "BattOk init write failed.\n"); | |
2170 | goto out; | |
2171 | } | |
2172 | out: | |
2173 | return ret; | |
2174 | } | |
2175 | ||
2176 | /** | |
2177 | * ab8500_fg_external_power_changed() - callback for power supply changes | |
2178 | * @psy: pointer to the structure power_supply | |
2179 | * | |
2180 | * This function is the entry point of the pointer external_power_changed | |
2181 | * of the structure power_supply. | |
2182 | * This function gets executed when there is a change in any external power | |
2183 | * supply that this driver needs to be notified of. | |
2184 | */ | |
2185 | static void ab8500_fg_external_power_changed(struct power_supply *psy) | |
2186 | { | |
2187 | struct ab8500_fg *di = to_ab8500_fg_device_info(psy); | |
2188 | ||
2189 | class_for_each_device(power_supply_class, NULL, | |
2190 | &di->fg_psy, ab8500_fg_get_ext_psy_data); | |
2191 | } | |
2192 | ||
2193 | /** | |
2194 | * abab8500_fg_reinit_work() - work to reset the FG algorithm | |
2195 | * @work: pointer to the work_struct structure | |
2196 | * | |
2197 | * Used to reset the current battery capacity to be able to | |
2198 | * retrigger a new voltage base capacity calculation. For | |
2199 | * test and verification purpose. | |
2200 | */ | |
2201 | static void ab8500_fg_reinit_work(struct work_struct *work) | |
2202 | { | |
2203 | struct ab8500_fg *di = container_of(work, struct ab8500_fg, | |
2204 | fg_reinit_work.work); | |
2205 | ||
2206 | if (di->flags.calibrate == false) { | |
2207 | dev_dbg(di->dev, "Resetting FG state machine to init.\n"); | |
2208 | ab8500_fg_clear_cap_samples(di); | |
2209 | ab8500_fg_calc_cap_discharge_voltage(di, true); | |
2210 | ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT); | |
2211 | ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT); | |
2212 | queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); | |
2213 | ||
2214 | } else { | |
2215 | dev_err(di->dev, "Residual offset calibration ongoing " | |
2216 | "retrying..\n"); | |
2217 | /* Wait one second until next try*/ | |
2218 | queue_delayed_work(di->fg_wq, &di->fg_reinit_work, | |
2219 | round_jiffies(1)); | |
2220 | } | |
2221 | } | |
2222 | ||
2223 | /** | |
2224 | * ab8500_fg_reinit() - forces FG algorithm to reinitialize with current values | |
2225 | * | |
2226 | * This function can be used to force the FG algorithm to recalculate a new | |
2227 | * voltage based battery capacity. | |
2228 | */ | |
2229 | void ab8500_fg_reinit(void) | |
2230 | { | |
2231 | struct ab8500_fg *di = ab8500_fg_get(); | |
2232 | /* User won't be notified if a null pointer returned. */ | |
2233 | if (di != NULL) | |
2234 | queue_delayed_work(di->fg_wq, &di->fg_reinit_work, 0); | |
2235 | } | |
2236 | ||
2237 | /* Exposure to the sysfs interface */ | |
2238 | ||
2239 | struct ab8500_fg_sysfs_entry { | |
2240 | struct attribute attr; | |
2241 | ssize_t (*show)(struct ab8500_fg *, char *); | |
2242 | ssize_t (*store)(struct ab8500_fg *, const char *, size_t); | |
2243 | }; | |
2244 | ||
2245 | static ssize_t charge_full_show(struct ab8500_fg *di, char *buf) | |
2246 | { | |
2247 | return sprintf(buf, "%d\n", di->bat_cap.max_mah); | |
2248 | } | |
2249 | ||
2250 | static ssize_t charge_full_store(struct ab8500_fg *di, const char *buf, | |
2251 | size_t count) | |
2252 | { | |
2253 | unsigned long charge_full; | |
2254 | ssize_t ret = -EINVAL; | |
2255 | ||
2256 | ret = strict_strtoul(buf, 10, &charge_full); | |
2257 | ||
5ae2b822 | 2258 | dev_dbg(di->dev, "Ret %zd charge_full %lu", ret, charge_full); |
13151631 AM |
2259 | |
2260 | if (!ret) { | |
2261 | di->bat_cap.max_mah = (int) charge_full; | |
2262 | ret = count; | |
2263 | } | |
2264 | return ret; | |
2265 | } | |
2266 | ||
2267 | static ssize_t charge_now_show(struct ab8500_fg *di, char *buf) | |
2268 | { | |
2269 | return sprintf(buf, "%d\n", di->bat_cap.prev_mah); | |
2270 | } | |
2271 | ||
2272 | static ssize_t charge_now_store(struct ab8500_fg *di, const char *buf, | |
2273 | size_t count) | |
2274 | { | |
2275 | unsigned long charge_now; | |
2276 | ssize_t ret; | |
2277 | ||
2278 | ret = strict_strtoul(buf, 10, &charge_now); | |
2279 | ||
5ae2b822 | 2280 | dev_dbg(di->dev, "Ret %zd charge_now %lu was %d", |
13151631 AM |
2281 | ret, charge_now, di->bat_cap.prev_mah); |
2282 | ||
2283 | if (!ret) { | |
2284 | di->bat_cap.user_mah = (int) charge_now; | |
2285 | di->flags.user_cap = true; | |
2286 | ret = count; | |
2287 | queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); | |
2288 | } | |
2289 | return ret; | |
2290 | } | |
2291 | ||
2292 | static struct ab8500_fg_sysfs_entry charge_full_attr = | |
2293 | __ATTR(charge_full, 0644, charge_full_show, charge_full_store); | |
2294 | ||
2295 | static struct ab8500_fg_sysfs_entry charge_now_attr = | |
2296 | __ATTR(charge_now, 0644, charge_now_show, charge_now_store); | |
2297 | ||
2298 | static ssize_t | |
2299 | ab8500_fg_show(struct kobject *kobj, struct attribute *attr, char *buf) | |
2300 | { | |
2301 | struct ab8500_fg_sysfs_entry *entry; | |
2302 | struct ab8500_fg *di; | |
2303 | ||
2304 | entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr); | |
2305 | di = container_of(kobj, struct ab8500_fg, fg_kobject); | |
2306 | ||
2307 | if (!entry->show) | |
2308 | return -EIO; | |
2309 | ||
2310 | return entry->show(di, buf); | |
2311 | } | |
2312 | static ssize_t | |
2313 | ab8500_fg_store(struct kobject *kobj, struct attribute *attr, const char *buf, | |
2314 | size_t count) | |
2315 | { | |
2316 | struct ab8500_fg_sysfs_entry *entry; | |
2317 | struct ab8500_fg *di; | |
2318 | ||
2319 | entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr); | |
2320 | di = container_of(kobj, struct ab8500_fg, fg_kobject); | |
2321 | ||
2322 | if (!entry->store) | |
2323 | return -EIO; | |
2324 | ||
2325 | return entry->store(di, buf, count); | |
2326 | } | |
2327 | ||
64eb9b02 | 2328 | static const struct sysfs_ops ab8500_fg_sysfs_ops = { |
13151631 AM |
2329 | .show = ab8500_fg_show, |
2330 | .store = ab8500_fg_store, | |
2331 | }; | |
2332 | ||
2333 | static struct attribute *ab8500_fg_attrs[] = { | |
2334 | &charge_full_attr.attr, | |
2335 | &charge_now_attr.attr, | |
2336 | NULL, | |
2337 | }; | |
2338 | ||
2339 | static struct kobj_type ab8500_fg_ktype = { | |
2340 | .sysfs_ops = &ab8500_fg_sysfs_ops, | |
2341 | .default_attrs = ab8500_fg_attrs, | |
2342 | }; | |
2343 | ||
2344 | /** | |
2345 | * ab8500_chargalg_sysfs_exit() - de-init of sysfs entry | |
2346 | * @di: pointer to the struct ab8500_chargalg | |
2347 | * | |
2348 | * This function removes the entry in sysfs. | |
2349 | */ | |
2350 | static void ab8500_fg_sysfs_exit(struct ab8500_fg *di) | |
2351 | { | |
2352 | kobject_del(&di->fg_kobject); | |
2353 | } | |
2354 | ||
2355 | /** | |
2356 | * ab8500_chargalg_sysfs_init() - init of sysfs entry | |
2357 | * @di: pointer to the struct ab8500_chargalg | |
2358 | * | |
2359 | * This function adds an entry in sysfs. | |
2360 | * Returns error code in case of failure else 0(on success) | |
2361 | */ | |
2362 | static int ab8500_fg_sysfs_init(struct ab8500_fg *di) | |
2363 | { | |
2364 | int ret = 0; | |
2365 | ||
2366 | ret = kobject_init_and_add(&di->fg_kobject, | |
2367 | &ab8500_fg_ktype, | |
2368 | NULL, "battery"); | |
2369 | if (ret < 0) | |
2370 | dev_err(di->dev, "failed to create sysfs entry\n"); | |
2371 | ||
2372 | return ret; | |
2373 | } | |
2374 | /* Exposure to the sysfs interface <<END>> */ | |
2375 | ||
2376 | #if defined(CONFIG_PM) | |
2377 | static int ab8500_fg_resume(struct platform_device *pdev) | |
2378 | { | |
2379 | struct ab8500_fg *di = platform_get_drvdata(pdev); | |
2380 | ||
2381 | /* | |
2382 | * Change state if we're not charging. If we're charging we will wake | |
2383 | * up on the FG IRQ | |
2384 | */ | |
2385 | if (!di->flags.charging) { | |
2386 | ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_WAKEUP); | |
2387 | queue_work(di->fg_wq, &di->fg_work); | |
2388 | } | |
2389 | ||
2390 | return 0; | |
2391 | } | |
2392 | ||
2393 | static int ab8500_fg_suspend(struct platform_device *pdev, | |
2394 | pm_message_t state) | |
2395 | { | |
2396 | struct ab8500_fg *di = platform_get_drvdata(pdev); | |
2397 | ||
2398 | flush_delayed_work(&di->fg_periodic_work); | |
2399 | ||
2400 | /* | |
2401 | * If the FG is enabled we will disable it before going to suspend | |
2402 | * only if we're not charging | |
2403 | */ | |
2404 | if (di->flags.fg_enabled && !di->flags.charging) | |
2405 | ab8500_fg_coulomb_counter(di, false); | |
2406 | ||
2407 | return 0; | |
2408 | } | |
2409 | #else | |
2410 | #define ab8500_fg_suspend NULL | |
2411 | #define ab8500_fg_resume NULL | |
2412 | #endif | |
2413 | ||
2414 | static int __devexit ab8500_fg_remove(struct platform_device *pdev) | |
2415 | { | |
2416 | int ret = 0; | |
2417 | struct ab8500_fg *di = platform_get_drvdata(pdev); | |
2418 | ||
2419 | list_del(&di->node); | |
2420 | ||
2421 | /* Disable coulomb counter */ | |
2422 | ret = ab8500_fg_coulomb_counter(di, false); | |
2423 | if (ret) | |
2424 | dev_err(di->dev, "failed to disable coulomb counter\n"); | |
2425 | ||
2426 | destroy_workqueue(di->fg_wq); | |
2427 | ab8500_fg_sysfs_exit(di); | |
2428 | ||
2429 | flush_scheduled_work(); | |
2430 | power_supply_unregister(&di->fg_psy); | |
2431 | platform_set_drvdata(pdev, NULL); | |
2432 | kfree(di); | |
2433 | return ret; | |
2434 | } | |
2435 | ||
2436 | /* ab8500 fg driver interrupts and their respective isr */ | |
2437 | static struct ab8500_fg_interrupts ab8500_fg_irq[] = { | |
2438 | {"NCONV_ACCU", ab8500_fg_cc_convend_handler}, | |
2439 | {"BATT_OVV", ab8500_fg_batt_ovv_handler}, | |
2440 | {"LOW_BAT_F", ab8500_fg_lowbatf_handler}, | |
2441 | {"CC_INT_CALIB", ab8500_fg_cc_int_calib_handler}, | |
2442 | {"CCEOC", ab8500_fg_cc_data_end_handler}, | |
2443 | }; | |
2444 | ||
2445 | static int __devinit ab8500_fg_probe(struct platform_device *pdev) | |
2446 | { | |
2447 | int i, irq; | |
2448 | int ret = 0; | |
2aac3de1 LJ |
2449 | struct abx500_bm_plat_data *plat_data = pdev->dev.platform_data; |
2450 | struct ab8500_fg *di; | |
2451 | ||
2452 | if (!plat_data) { | |
2453 | dev_err(&pdev->dev, "No platform data\n"); | |
2454 | return -EINVAL; | |
2455 | } | |
13151631 | 2456 | |
2aac3de1 | 2457 | di = kzalloc(sizeof(*di), GFP_KERNEL); |
13151631 AM |
2458 | if (!di) |
2459 | return -ENOMEM; | |
2460 | ||
2461 | mutex_init(&di->cc_lock); | |
2462 | ||
2463 | /* get parent data */ | |
2464 | di->dev = &pdev->dev; | |
2465 | di->parent = dev_get_drvdata(pdev->dev.parent); | |
2466 | di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0"); | |
2467 | ||
2468 | /* get fg specific platform data */ | |
2aac3de1 LJ |
2469 | di->pdata = plat_data->fg; |
2470 | if (!di->pdata) { | |
13151631 AM |
2471 | dev_err(di->dev, "no fg platform data supplied\n"); |
2472 | ret = -EINVAL; | |
2473 | goto free_device_info; | |
2474 | } | |
2475 | ||
2476 | /* get battery specific platform data */ | |
2477 | di->bat = plat_data->battery; | |
2478 | if (!di->bat) { | |
2479 | dev_err(di->dev, "no battery platform data supplied\n"); | |
2480 | ret = -EINVAL; | |
2481 | goto free_device_info; | |
2482 | } | |
2483 | ||
2484 | di->fg_psy.name = "ab8500_fg"; | |
2485 | di->fg_psy.type = POWER_SUPPLY_TYPE_BATTERY; | |
2486 | di->fg_psy.properties = ab8500_fg_props; | |
2487 | di->fg_psy.num_properties = ARRAY_SIZE(ab8500_fg_props); | |
2488 | di->fg_psy.get_property = ab8500_fg_get_property; | |
2489 | di->fg_psy.supplied_to = di->pdata->supplied_to; | |
2490 | di->fg_psy.num_supplicants = di->pdata->num_supplicants; | |
2491 | di->fg_psy.external_power_changed = ab8500_fg_external_power_changed; | |
2492 | ||
2493 | di->bat_cap.max_mah_design = MILLI_TO_MICRO * | |
2494 | di->bat->bat_type[di->bat->batt_id].charge_full_design; | |
2495 | ||
2496 | di->bat_cap.max_mah = di->bat_cap.max_mah_design; | |
2497 | ||
2498 | di->vbat_nom = di->bat->bat_type[di->bat->batt_id].nominal_voltage; | |
2499 | ||
2500 | di->init_capacity = true; | |
2501 | ||
2502 | ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT); | |
2503 | ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT); | |
2504 | ||
2505 | /* Create a work queue for running the FG algorithm */ | |
2506 | di->fg_wq = create_singlethread_workqueue("ab8500_fg_wq"); | |
2507 | if (di->fg_wq == NULL) { | |
2508 | dev_err(di->dev, "failed to create work queue\n"); | |
2509 | goto free_device_info; | |
2510 | } | |
2511 | ||
2512 | /* Init work for running the fg algorithm instantly */ | |
2513 | INIT_WORK(&di->fg_work, ab8500_fg_instant_work); | |
2514 | ||
2515 | /* Init work for getting the battery accumulated current */ | |
2516 | INIT_WORK(&di->fg_acc_cur_work, ab8500_fg_acc_cur_work); | |
2517 | ||
2518 | /* Init work for reinitialising the fg algorithm */ | |
2519 | INIT_DELAYED_WORK_DEFERRABLE(&di->fg_reinit_work, | |
2520 | ab8500_fg_reinit_work); | |
2521 | ||
2522 | /* Work delayed Queue to run the state machine */ | |
2523 | INIT_DELAYED_WORK_DEFERRABLE(&di->fg_periodic_work, | |
2524 | ab8500_fg_periodic_work); | |
2525 | ||
2526 | /* Work to check low battery condition */ | |
2527 | INIT_DELAYED_WORK_DEFERRABLE(&di->fg_low_bat_work, | |
2528 | ab8500_fg_low_bat_work); | |
2529 | ||
2530 | /* Init work for HW failure check */ | |
2531 | INIT_DELAYED_WORK_DEFERRABLE(&di->fg_check_hw_failure_work, | |
2532 | ab8500_fg_check_hw_failure_work); | |
2533 | ||
2534 | /* Initialize OVV, and other registers */ | |
2535 | ret = ab8500_fg_init_hw_registers(di); | |
2536 | if (ret) { | |
2537 | dev_err(di->dev, "failed to initialize registers\n"); | |
2538 | goto free_inst_curr_wq; | |
2539 | } | |
2540 | ||
2541 | /* Consider battery unknown until we're informed otherwise */ | |
2542 | di->flags.batt_unknown = true; | |
2543 | di->flags.batt_id_received = false; | |
2544 | ||
2545 | /* Register FG power supply class */ | |
2546 | ret = power_supply_register(di->dev, &di->fg_psy); | |
2547 | if (ret) { | |
2548 | dev_err(di->dev, "failed to register FG psy\n"); | |
2549 | goto free_inst_curr_wq; | |
2550 | } | |
2551 | ||
2552 | di->fg_samples = SEC_TO_SAMPLE(di->bat->fg_params->init_timer); | |
2553 | ab8500_fg_coulomb_counter(di, true); | |
2554 | ||
2555 | /* Initialize completion used to notify completion of inst current */ | |
2556 | init_completion(&di->ab8500_fg_complete); | |
2557 | ||
2558 | /* Register interrupts */ | |
2559 | for (i = 0; i < ARRAY_SIZE(ab8500_fg_irq); i++) { | |
2560 | irq = platform_get_irq_byname(pdev, ab8500_fg_irq[i].name); | |
2561 | ret = request_threaded_irq(irq, NULL, ab8500_fg_irq[i].isr, | |
2562 | IRQF_SHARED | IRQF_NO_SUSPEND, | |
2563 | ab8500_fg_irq[i].name, di); | |
2564 | ||
2565 | if (ret != 0) { | |
2566 | dev_err(di->dev, "failed to request %s IRQ %d: %d\n" | |
2567 | , ab8500_fg_irq[i].name, irq, ret); | |
2568 | goto free_irq; | |
2569 | } | |
2570 | dev_dbg(di->dev, "Requested %s IRQ %d: %d\n", | |
2571 | ab8500_fg_irq[i].name, irq, ret); | |
2572 | } | |
2573 | di->irq = platform_get_irq_byname(pdev, "CCEOC"); | |
2574 | disable_irq(di->irq); | |
2575 | ||
2576 | platform_set_drvdata(pdev, di); | |
2577 | ||
2578 | ret = ab8500_fg_sysfs_init(di); | |
2579 | if (ret) { | |
2580 | dev_err(di->dev, "failed to create sysfs entry\n"); | |
2581 | goto free_irq; | |
2582 | } | |
2583 | ||
2584 | /* Calibrate the fg first time */ | |
2585 | di->flags.calibrate = true; | |
2586 | di->calib_state = AB8500_FG_CALIB_INIT; | |
2587 | ||
2588 | /* Use room temp as default value until we get an update from driver. */ | |
2589 | di->bat_temp = 210; | |
2590 | ||
2591 | /* Run the FG algorithm */ | |
2592 | queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); | |
2593 | ||
2594 | list_add_tail(&di->node, &ab8500_fg_list); | |
2595 | ||
2596 | return ret; | |
2597 | ||
2598 | free_irq: | |
2599 | power_supply_unregister(&di->fg_psy); | |
2600 | ||
2601 | /* We also have to free all successfully registered irqs */ | |
2602 | for (i = i - 1; i >= 0; i--) { | |
2603 | irq = platform_get_irq_byname(pdev, ab8500_fg_irq[i].name); | |
2604 | free_irq(irq, di); | |
2605 | } | |
2606 | free_inst_curr_wq: | |
2607 | destroy_workqueue(di->fg_wq); | |
2608 | free_device_info: | |
2609 | kfree(di); | |
2610 | ||
2611 | return ret; | |
2612 | } | |
2613 | ||
2614 | static struct platform_driver ab8500_fg_driver = { | |
2615 | .probe = ab8500_fg_probe, | |
2616 | .remove = __devexit_p(ab8500_fg_remove), | |
2617 | .suspend = ab8500_fg_suspend, | |
2618 | .resume = ab8500_fg_resume, | |
2619 | .driver = { | |
2620 | .name = "ab8500-fg", | |
2621 | .owner = THIS_MODULE, | |
2622 | }, | |
2623 | }; | |
2624 | ||
2625 | static int __init ab8500_fg_init(void) | |
2626 | { | |
2627 | return platform_driver_register(&ab8500_fg_driver); | |
2628 | } | |
2629 | ||
2630 | static void __exit ab8500_fg_exit(void) | |
2631 | { | |
2632 | platform_driver_unregister(&ab8500_fg_driver); | |
2633 | } | |
2634 | ||
2635 | subsys_initcall_sync(ab8500_fg_init); | |
2636 | module_exit(ab8500_fg_exit); | |
2637 | ||
2638 | MODULE_LICENSE("GPL v2"); | |
2639 | MODULE_AUTHOR("Johan Palsson, Karl Komierowski"); | |
2640 | MODULE_ALIAS("platform:ab8500-fg"); | |
2641 | MODULE_DESCRIPTION("AB8500 Fuel Gauge driver"); |