1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) ST-Ericsson SA 2012
4 *
5 * Battery temperature driver for AB8500
6 *
7 * Author:
8 * Johan Palsson <johan.palsson@stericsson.com>
9 * Karl Komierowski <karl.komierowski@stericsson.com>
10 * Arun R Murthy <arun.murthy@stericsson.com>
11 */
12
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/device.h>
16 #include <linux/interrupt.h>
17 #include <linux/delay.h>
18 #include <linux/slab.h>
19 #include <linux/platform_device.h>
20 #include <linux/power_supply.h>
21 #include <linux/completion.h>
22 #include <linux/workqueue.h>
23 #include <linux/jiffies.h>
24 #include <linux/of.h>
25 #include <linux/mfd/core.h>
26 #include <linux/mfd/abx500.h>
27 #include <linux/mfd/abx500/ab8500.h>
28 #include <linux/mfd/abx500/ab8500-bm.h>
29 #include <linux/mfd/abx500/ab8500-gpadc.h>
30
31 #define VTVOUT_V 1800
32
33 #define BTEMP_THERMAL_LOW_LIMIT -10
34 #define BTEMP_THERMAL_MED_LIMIT 0
35 #define BTEMP_THERMAL_HIGH_LIMIT_52 52
36 #define BTEMP_THERMAL_HIGH_LIMIT_57 57
37 #define BTEMP_THERMAL_HIGH_LIMIT_62 62
38
39 #define BTEMP_BATCTRL_CURR_SRC_7UA 7
40 #define BTEMP_BATCTRL_CURR_SRC_20UA 20
41
42 #define BTEMP_BATCTRL_CURR_SRC_16UA 16
43 #define BTEMP_BATCTRL_CURR_SRC_18UA 18
44
45 #define BTEMP_BATCTRL_CURR_SRC_60UA 60
46 #define BTEMP_BATCTRL_CURR_SRC_120UA 120
47
48 /**
49 * struct ab8500_btemp_interrupts - ab8500 interrupts
50 * @name: name of the interrupt
51 * @isr function pointer to the isr
52 */
53 struct ab8500_btemp_interrupts {
54 char *name;
55 irqreturn_t (*isr)(int irq, void *data);
56 };
57
58 struct ab8500_btemp_events {
59 bool batt_rem;
60 bool btemp_high;
61 bool btemp_medhigh;
62 bool btemp_lowmed;
63 bool btemp_low;
64 bool ac_conn;
65 bool usb_conn;
66 };
67
68 struct ab8500_btemp_ranges {
69 int btemp_high_limit;
70 int btemp_med_limit;
71 int btemp_low_limit;
72 };
73
74 /**
75 * struct ab8500_btemp - ab8500 BTEMP device information
76 * @dev: Pointer to the structure device
77 * @node: List of AB8500 BTEMPs, hence prepared for reentrance
78 * @curr_source: What current source we use, in uA
79 * @bat_temp: Dispatched battery temperature in degree Celsius
80 * @prev_bat_temp Last measured battery temperature in degree Celsius
81 * @parent: Pointer to the struct ab8500
82 * @gpadc: Pointer to the struct gpadc
83 * @fg: Pointer to the struct fg
84 * @bm: Platform specific battery management information
85 * @btemp_psy: Structure for BTEMP specific battery properties
86 * @events: Structure for information about events triggered
87 * @btemp_ranges: Battery temperature range structure
88 * @btemp_wq: Work queue for measuring the temperature periodically
89 * @btemp_periodic_work: Work for measuring the temperature periodically
90 * @initialized: True if battery id read.
91 */
92 struct ab8500_btemp {
93 struct device *dev;
94 struct list_head node;
95 int curr_source;
96 int bat_temp;
97 int prev_bat_temp;
98 struct ab8500 *parent;
99 struct ab8500_gpadc *gpadc;
100 struct ab8500_fg *fg;
101 struct abx500_bm_data *bm;
102 struct power_supply *btemp_psy;
103 struct ab8500_btemp_events events;
104 struct ab8500_btemp_ranges btemp_ranges;
105 struct workqueue_struct *btemp_wq;
106 struct delayed_work btemp_periodic_work;
107 bool initialized;
108 };
109
110 /* BTEMP power supply properties */
111 static enum power_supply_property ab8500_btemp_props[] = {
112 POWER_SUPPLY_PROP_PRESENT,
113 POWER_SUPPLY_PROP_ONLINE,
114 POWER_SUPPLY_PROP_TECHNOLOGY,
115 POWER_SUPPLY_PROP_TEMP,
116 };
117
118 static LIST_HEAD(ab8500_btemp_list);
119
120 /**
121 * ab8500_btemp_get() - returns a reference to the primary AB8500 BTEMP
122 * (i.e. the first BTEMP in the instance list)
123 */
ab8500_btemp_get(void)124 struct ab8500_btemp *ab8500_btemp_get(void)
125 {
126 return list_first_entry(&ab8500_btemp_list, struct ab8500_btemp, node);
127 }
128 EXPORT_SYMBOL(ab8500_btemp_get);
129
130 /**
131 * ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance
132 * @di: pointer to the ab8500_btemp structure
133 * @v_batctrl: measured batctrl voltage
134 * @inst_curr: measured instant current
135 *
136 * This function returns the battery resistance that is
137 * derived from the BATCTRL voltage.
138 * Returns value in Ohms.
139 */
ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp * di,int v_batctrl,int inst_curr)140 static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di,
141 int v_batctrl, int inst_curr)
142 {
143 int rbs;
144
145 if (is_ab8500_1p1_or_earlier(di->parent)) {
146 /*
147 * For ABB cut1.0 and 1.1 BAT_CTRL is internally
148 * connected to 1.8V through a 450k resistor
149 */
150 return (450000 * (v_batctrl)) / (1800 - v_batctrl);
151 }
152
153 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL) {
154 /*
155 * If the battery has internal NTC, we use the current
156 * source to calculate the resistance.
157 */
158 rbs = (v_batctrl * 1000
159 - di->bm->gnd_lift_resistance * inst_curr)
160 / di->curr_source;
161 } else {
162 /*
163 * BAT_CTRL is internally
164 * connected to 1.8V through a 80k resistor
165 */
166 rbs = (80000 * (v_batctrl)) / (1800 - v_batctrl);
167 }
168
169 return rbs;
170 }
171
172 /**
173 * ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage
174 * @di: pointer to the ab8500_btemp structure
175 *
176 * This function returns the voltage on BATCTRL. Returns value in mV.
177 */
ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp * di)178 static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp *di)
179 {
180 int vbtemp;
181 static int prev;
182
183 vbtemp = ab8500_gpadc_convert(di->gpadc, BAT_CTRL);
184 if (vbtemp < 0) {
185 dev_err(di->dev,
186 "%s gpadc conversion failed, using previous value",
187 __func__);
188 return prev;
189 }
190 prev = vbtemp;
191 return vbtemp;
192 }
193
194 /**
195 * ab8500_btemp_curr_source_enable() - enable/disable batctrl current source
196 * @di: pointer to the ab8500_btemp structure
197 * @enable: enable or disable the current source
198 *
199 * Enable or disable the current sources for the BatCtrl AD channel
200 */
ab8500_btemp_curr_source_enable(struct ab8500_btemp * di,bool enable)201 static int ab8500_btemp_curr_source_enable(struct ab8500_btemp *di,
202 bool enable)
203 {
204 int curr;
205 int ret = 0;
206
207 /*
208 * BATCTRL current sources are included on AB8500 cut2.0
209 * and future versions
210 */
211 if (is_ab8500_1p1_or_earlier(di->parent))
212 return 0;
213
214 /* Only do this for batteries with internal NTC */
215 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && enable) {
216
217 if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_7UA)
218 curr = BAT_CTRL_7U_ENA;
219 else
220 curr = BAT_CTRL_20U_ENA;
221
222 dev_dbg(di->dev, "Set BATCTRL %duA\n", di->curr_source);
223
224 ret = abx500_mask_and_set_register_interruptible(di->dev,
225 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
226 FORCE_BAT_CTRL_CMP_HIGH, FORCE_BAT_CTRL_CMP_HIGH);
227 if (ret) {
228 dev_err(di->dev, "%s failed setting cmp_force\n",
229 __func__);
230 return ret;
231 }
232
233 /*
234 * We have to wait one 32kHz cycle before enabling
235 * the current source, since ForceBatCtrlCmpHigh needs
236 * to be written in a separate cycle
237 */
238 udelay(32);
239
240 ret = abx500_set_register_interruptible(di->dev,
241 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
242 FORCE_BAT_CTRL_CMP_HIGH | curr);
243 if (ret) {
244 dev_err(di->dev, "%s failed enabling current source\n",
245 __func__);
246 goto disable_curr_source;
247 }
248 } else if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && !enable) {
249 dev_dbg(di->dev, "Disable BATCTRL curr source\n");
250
251 /* Write 0 to the curr bits */
252 ret = abx500_mask_and_set_register_interruptible(
253 di->dev,
254 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
255 BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
256 ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
257
258 if (ret) {
259 dev_err(di->dev, "%s failed disabling current source\n",
260 __func__);
261 goto disable_curr_source;
262 }
263
264 /* Enable Pull-Up and comparator */
265 ret = abx500_mask_and_set_register_interruptible(di->dev,
266 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
267 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
268 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
269 if (ret) {
270 dev_err(di->dev, "%s failed enabling PU and comp\n",
271 __func__);
272 goto enable_pu_comp;
273 }
274
275 /*
276 * We have to wait one 32kHz cycle before disabling
277 * ForceBatCtrlCmpHigh since this needs to be written
278 * in a separate cycle
279 */
280 udelay(32);
281
282 /* Disable 'force comparator' */
283 ret = abx500_mask_and_set_register_interruptible(di->dev,
284 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
285 FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
286 if (ret) {
287 dev_err(di->dev, "%s failed disabling force comp\n",
288 __func__);
289 goto disable_force_comp;
290 }
291 }
292 return ret;
293
294 /*
295 * We have to try unsetting FORCE_BAT_CTRL_CMP_HIGH one more time
296 * if we got an error above
297 */
298 disable_curr_source:
299 /* Write 0 to the curr bits */
300 ret = abx500_mask_and_set_register_interruptible(di->dev,
301 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
302 BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
303 ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
304
305 if (ret) {
306 dev_err(di->dev, "%s failed disabling current source\n",
307 __func__);
308 return ret;
309 }
310 enable_pu_comp:
311 /* Enable Pull-Up and comparator */
312 ret = abx500_mask_and_set_register_interruptible(di->dev,
313 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
314 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
315 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
316 if (ret) {
317 dev_err(di->dev, "%s failed enabling PU and comp\n",
318 __func__);
319 return ret;
320 }
321
322 disable_force_comp:
323 /*
324 * We have to wait one 32kHz cycle before disabling
325 * ForceBatCtrlCmpHigh since this needs to be written
326 * in a separate cycle
327 */
328 udelay(32);
329
330 /* Disable 'force comparator' */
331 ret = abx500_mask_and_set_register_interruptible(di->dev,
332 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
333 FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
334 if (ret) {
335 dev_err(di->dev, "%s failed disabling force comp\n",
336 __func__);
337 return ret;
338 }
339
340 return ret;
341 }
342
343 /**
344 * ab8500_btemp_get_batctrl_res() - get battery resistance
345 * @di: pointer to the ab8500_btemp structure
346 *
347 * This function returns the battery pack identification resistance.
348 * Returns value in Ohms.
349 */
ab8500_btemp_get_batctrl_res(struct ab8500_btemp * di)350 static int ab8500_btemp_get_batctrl_res(struct ab8500_btemp *di)
351 {
352 int ret;
353 int batctrl = 0;
354 int res;
355 int inst_curr;
356 int i;
357
358 /*
359 * BATCTRL current sources are included on AB8500 cut2.0
360 * and future versions
361 */
362 ret = ab8500_btemp_curr_source_enable(di, true);
363 if (ret) {
364 dev_err(di->dev, "%s curr source enabled failed\n", __func__);
365 return ret;
366 }
367
368 if (!di->fg)
369 di->fg = ab8500_fg_get();
370 if (!di->fg) {
371 dev_err(di->dev, "No fg found\n");
372 return -EINVAL;
373 }
374
375 ret = ab8500_fg_inst_curr_start(di->fg);
376
377 if (ret) {
378 dev_err(di->dev, "Failed to start current measurement\n");
379 return ret;
380 }
381
382 do {
383 msleep(20);
384 } while (!ab8500_fg_inst_curr_started(di->fg));
385
386 i = 0;
387
388 do {
389 batctrl += ab8500_btemp_read_batctrl_voltage(di);
390 i++;
391 msleep(20);
392 } while (!ab8500_fg_inst_curr_done(di->fg));
393 batctrl /= i;
394
395 ret = ab8500_fg_inst_curr_finalize(di->fg, &inst_curr);
396 if (ret) {
397 dev_err(di->dev, "Failed to finalize current measurement\n");
398 return ret;
399 }
400
401 res = ab8500_btemp_batctrl_volt_to_res(di, batctrl, inst_curr);
402
403 ret = ab8500_btemp_curr_source_enable(di, false);
404 if (ret) {
405 dev_err(di->dev, "%s curr source disable failed\n", __func__);
406 return ret;
407 }
408
409 dev_dbg(di->dev, "%s batctrl: %d res: %d inst_curr: %d samples: %d\n",
410 __func__, batctrl, res, inst_curr, i);
411
412 return res;
413 }
414
415 /**
416 * ab8500_btemp_res_to_temp() - resistance to temperature
417 * @di: pointer to the ab8500_btemp structure
418 * @tbl: pointer to the resiatance to temperature table
419 * @tbl_size: size of the resistance to temperature table
420 * @res: resistance to calculate the temperature from
421 *
422 * This function returns the battery temperature in degrees Celsius
423 * based on the NTC resistance.
424 */
ab8500_btemp_res_to_temp(struct ab8500_btemp * di,const struct abx500_res_to_temp * tbl,int tbl_size,int res)425 static int ab8500_btemp_res_to_temp(struct ab8500_btemp *di,
426 const struct abx500_res_to_temp *tbl, int tbl_size, int res)
427 {
428 int i;
429 /*
430 * Calculate the formula for the straight line
431 * Simple interpolation if we are within
432 * the resistance table limits, extrapolate
433 * if resistance is outside the limits.
434 */
435 if (res > tbl[0].resist)
436 i = 0;
437 else if (res <= tbl[tbl_size - 1].resist)
438 i = tbl_size - 2;
439 else {
440 i = 0;
441 while (!(res <= tbl[i].resist &&
442 res > tbl[i + 1].resist))
443 i++;
444 }
445
446 return tbl[i].temp + ((tbl[i + 1].temp - tbl[i].temp) *
447 (res - tbl[i].resist)) / (tbl[i + 1].resist - tbl[i].resist);
448 }
449
450 /**
451 * ab8500_btemp_measure_temp() - measure battery temperature
452 * @di: pointer to the ab8500_btemp structure
453 *
454 * Returns battery temperature (on success) else the previous temperature
455 */
ab8500_btemp_measure_temp(struct ab8500_btemp * di)456 static int ab8500_btemp_measure_temp(struct ab8500_btemp *di)
457 {
458 int temp;
459 static int prev;
460 int rbat, rntc, vntc;
461 u8 id;
462
463 id = di->bm->batt_id;
464
465 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL &&
466 id != BATTERY_UNKNOWN) {
467
468 rbat = ab8500_btemp_get_batctrl_res(di);
469 if (rbat < 0) {
470 dev_err(di->dev, "%s get batctrl res failed\n",
471 __func__);
472 /*
473 * Return out-of-range temperature so that
474 * charging is stopped
475 */
476 return BTEMP_THERMAL_LOW_LIMIT;
477 }
478
479 temp = ab8500_btemp_res_to_temp(di,
480 di->bm->bat_type[id].r_to_t_tbl,
481 di->bm->bat_type[id].n_temp_tbl_elements, rbat);
482 } else {
483 vntc = ab8500_gpadc_convert(di->gpadc, BTEMP_BALL);
484 if (vntc < 0) {
485 dev_err(di->dev,
486 "%s gpadc conversion failed,"
487 " using previous value\n", __func__);
488 return prev;
489 }
490 /*
491 * The PCB NTC is sourced from VTVOUT via a 230kOhm
492 * resistor.
493 */
494 rntc = 230000 * vntc / (VTVOUT_V - vntc);
495
496 temp = ab8500_btemp_res_to_temp(di,
497 di->bm->bat_type[id].r_to_t_tbl,
498 di->bm->bat_type[id].n_temp_tbl_elements, rntc);
499 prev = temp;
500 }
501 dev_dbg(di->dev, "Battery temperature is %d\n", temp);
502 return temp;
503 }
504
505 /**
506 * ab8500_btemp_id() - Identify the connected battery
507 * @di: pointer to the ab8500_btemp structure
508 *
509 * This function will try to identify the battery by reading the ID
510 * resistor. Some brands use a combined ID resistor with a NTC resistor to
511 * both be able to identify and to read the temperature of it.
512 */
ab8500_btemp_id(struct ab8500_btemp * di)513 static int ab8500_btemp_id(struct ab8500_btemp *di)
514 {
515 int res;
516 u8 i;
517
518 di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA;
519 di->bm->batt_id = BATTERY_UNKNOWN;
520
521 res = ab8500_btemp_get_batctrl_res(di);
522 if (res < 0) {
523 dev_err(di->dev, "%s get batctrl res failed\n", __func__);
524 return -ENXIO;
525 }
526
527 /* BATTERY_UNKNOWN is defined on position 0, skip it! */
528 for (i = BATTERY_UNKNOWN + 1; i < di->bm->n_btypes; i++) {
529 if ((res <= di->bm->bat_type[i].resis_high) &&
530 (res >= di->bm->bat_type[i].resis_low)) {
531 dev_dbg(di->dev, "Battery detected on %s"
532 " low %d < res %d < high: %d"
533 " index: %d\n",
534 di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL ?
535 "BATCTRL" : "BATTEMP",
536 di->bm->bat_type[i].resis_low, res,
537 di->bm->bat_type[i].resis_high, i);
538
539 di->bm->batt_id = i;
540 break;
541 }
542 }
543
544 if (di->bm->batt_id == BATTERY_UNKNOWN) {
545 dev_warn(di->dev, "Battery identified as unknown"
546 ", resistance %d Ohm\n", res);
547 return -ENXIO;
548 }
549
550 /*
551 * We only have to change current source if the
552 * detected type is Type 1.
553 */
554 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL &&
555 di->bm->batt_id == 1) {
556 dev_dbg(di->dev, "Set BATCTRL current source to 20uA\n");
557 di->curr_source = BTEMP_BATCTRL_CURR_SRC_20UA;
558 }
559
560 return di->bm->batt_id;
561 }
562
563 /**
564 * ab8500_btemp_periodic_work() - Measuring the temperature periodically
565 * @work: pointer to the work_struct structure
566 *
567 * Work function for measuring the temperature periodically
568 */
ab8500_btemp_periodic_work(struct work_struct * work)569 static void ab8500_btemp_periodic_work(struct work_struct *work)
570 {
571 int interval;
572 int bat_temp;
573 struct ab8500_btemp *di = container_of(work,
574 struct ab8500_btemp, btemp_periodic_work.work);
575
576 if (!di->initialized) {
577 /* Identify the battery */
578 if (ab8500_btemp_id(di) < 0)
579 dev_warn(di->dev, "failed to identify the battery\n");
580 }
581
582 bat_temp = ab8500_btemp_measure_temp(di);
583 /*
584 * Filter battery temperature.
585 * Allow direct updates on temperature only if two samples result in
586 * same temperature. Else only allow 1 degree change from previous
587 * reported value in the direction of the new measurement.
588 */
589 if ((bat_temp == di->prev_bat_temp) || !di->initialized) {
590 if ((di->bat_temp != di->prev_bat_temp) || !di->initialized) {
591 di->initialized = true;
592 di->bat_temp = bat_temp;
593 power_supply_changed(di->btemp_psy);
594 }
595 } else if (bat_temp < di->prev_bat_temp) {
596 di->bat_temp--;
597 power_supply_changed(di->btemp_psy);
598 } else if (bat_temp > di->prev_bat_temp) {
599 di->bat_temp++;
600 power_supply_changed(di->btemp_psy);
601 }
602 di->prev_bat_temp = bat_temp;
603
604 if (di->events.ac_conn || di->events.usb_conn)
605 interval = di->bm->temp_interval_chg;
606 else
607 interval = di->bm->temp_interval_nochg;
608
609 /* Schedule a new measurement */
610 queue_delayed_work(di->btemp_wq,
611 &di->btemp_periodic_work,
612 round_jiffies(interval * HZ));
613 }
614
615 /**
616 * ab8500_btemp_batctrlindb_handler() - battery removal detected
617 * @irq: interrupt number
618 * @_di: void pointer that has to address of ab8500_btemp
619 *
620 * Returns IRQ status(IRQ_HANDLED)
621 */
ab8500_btemp_batctrlindb_handler(int irq,void * _di)622 static irqreturn_t ab8500_btemp_batctrlindb_handler(int irq, void *_di)
623 {
624 struct ab8500_btemp *di = _di;
625 dev_err(di->dev, "Battery removal detected!\n");
626
627 di->events.batt_rem = true;
628 power_supply_changed(di->btemp_psy);
629
630 return IRQ_HANDLED;
631 }
632
633 /**
634 * ab8500_btemp_templow_handler() - battery temp lower than 10 degrees
635 * @irq: interrupt number
636 * @_di: void pointer that has to address of ab8500_btemp
637 *
638 * Returns IRQ status(IRQ_HANDLED)
639 */
ab8500_btemp_templow_handler(int irq,void * _di)640 static irqreturn_t ab8500_btemp_templow_handler(int irq, void *_di)
641 {
642 struct ab8500_btemp *di = _di;
643
644 if (is_ab8500_3p3_or_earlier(di->parent)) {
645 dev_dbg(di->dev, "Ignore false btemp low irq"
646 " for ABB cut 1.0, 1.1, 2.0 and 3.3\n");
647 } else {
648 dev_crit(di->dev, "Battery temperature lower than -10deg c\n");
649
650 di->events.btemp_low = true;
651 di->events.btemp_high = false;
652 di->events.btemp_medhigh = false;
653 di->events.btemp_lowmed = false;
654 power_supply_changed(di->btemp_psy);
655 }
656
657 return IRQ_HANDLED;
658 }
659
660 /**
661 * ab8500_btemp_temphigh_handler() - battery temp higher than max temp
662 * @irq: interrupt number
663 * @_di: void pointer that has to address of ab8500_btemp
664 *
665 * Returns IRQ status(IRQ_HANDLED)
666 */
ab8500_btemp_temphigh_handler(int irq,void * _di)667 static irqreturn_t ab8500_btemp_temphigh_handler(int irq, void *_di)
668 {
669 struct ab8500_btemp *di = _di;
670
671 dev_crit(di->dev, "Battery temperature is higher than MAX temp\n");
672
673 di->events.btemp_high = true;
674 di->events.btemp_medhigh = false;
675 di->events.btemp_lowmed = false;
676 di->events.btemp_low = false;
677 power_supply_changed(di->btemp_psy);
678
679 return IRQ_HANDLED;
680 }
681
682 /**
683 * ab8500_btemp_lowmed_handler() - battery temp between low and medium
684 * @irq: interrupt number
685 * @_di: void pointer that has to address of ab8500_btemp
686 *
687 * Returns IRQ status(IRQ_HANDLED)
688 */
ab8500_btemp_lowmed_handler(int irq,void * _di)689 static irqreturn_t ab8500_btemp_lowmed_handler(int irq, void *_di)
690 {
691 struct ab8500_btemp *di = _di;
692
693 dev_dbg(di->dev, "Battery temperature is between low and medium\n");
694
695 di->events.btemp_lowmed = true;
696 di->events.btemp_medhigh = false;
697 di->events.btemp_high = false;
698 di->events.btemp_low = false;
699 power_supply_changed(di->btemp_psy);
700
701 return IRQ_HANDLED;
702 }
703
704 /**
705 * ab8500_btemp_medhigh_handler() - battery temp between medium and high
706 * @irq: interrupt number
707 * @_di: void pointer that has to address of ab8500_btemp
708 *
709 * Returns IRQ status(IRQ_HANDLED)
710 */
ab8500_btemp_medhigh_handler(int irq,void * _di)711 static irqreturn_t ab8500_btemp_medhigh_handler(int irq, void *_di)
712 {
713 struct ab8500_btemp *di = _di;
714
715 dev_dbg(di->dev, "Battery temperature is between medium and high\n");
716
717 di->events.btemp_medhigh = true;
718 di->events.btemp_lowmed = false;
719 di->events.btemp_high = false;
720 di->events.btemp_low = false;
721 power_supply_changed(di->btemp_psy);
722
723 return IRQ_HANDLED;
724 }
725
726 /**
727 * ab8500_btemp_periodic() - Periodic temperature measurements
728 * @di: pointer to the ab8500_btemp structure
729 * @enable: enable or disable periodic temperature measurements
730 *
731 * Starts of stops periodic temperature measurements. Periodic measurements
732 * should only be done when a charger is connected.
733 */
ab8500_btemp_periodic(struct ab8500_btemp * di,bool enable)734 static void ab8500_btemp_periodic(struct ab8500_btemp *di,
735 bool enable)
736 {
737 dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n",
738 enable);
739 /*
740 * Make sure a new measurement is done directly by cancelling
741 * any pending work
742 */
743 cancel_delayed_work_sync(&di->btemp_periodic_work);
744
745 if (enable)
746 queue_delayed_work(di->btemp_wq, &di->btemp_periodic_work, 0);
747 }
748
749 /**
750 * ab8500_btemp_get_temp() - get battery temperature
751 * @di: pointer to the ab8500_btemp structure
752 *
753 * Returns battery temperature
754 */
ab8500_btemp_get_temp(struct ab8500_btemp * di)755 int ab8500_btemp_get_temp(struct ab8500_btemp *di)
756 {
757 int temp = 0;
758
759 /*
760 * The BTEMP events are not reliabe on AB8500 cut3.3
761 * and prior versions
762 */
763 if (is_ab8500_3p3_or_earlier(di->parent)) {
764 temp = di->bat_temp * 10;
765 } else {
766 if (di->events.btemp_low) {
767 if (temp > di->btemp_ranges.btemp_low_limit)
768 temp = di->btemp_ranges.btemp_low_limit * 10;
769 else
770 temp = di->bat_temp * 10;
771 } else if (di->events.btemp_high) {
772 if (temp < di->btemp_ranges.btemp_high_limit)
773 temp = di->btemp_ranges.btemp_high_limit * 10;
774 else
775 temp = di->bat_temp * 10;
776 } else if (di->events.btemp_lowmed) {
777 if (temp > di->btemp_ranges.btemp_med_limit)
778 temp = di->btemp_ranges.btemp_med_limit * 10;
779 else
780 temp = di->bat_temp * 10;
781 } else if (di->events.btemp_medhigh) {
782 if (temp < di->btemp_ranges.btemp_med_limit)
783 temp = di->btemp_ranges.btemp_med_limit * 10;
784 else
785 temp = di->bat_temp * 10;
786 } else
787 temp = di->bat_temp * 10;
788 }
789 return temp;
790 }
791 EXPORT_SYMBOL(ab8500_btemp_get_temp);
792
793 /**
794 * ab8500_btemp_get_batctrl_temp() - get the temperature
795 * @btemp: pointer to the btemp structure
796 *
797 * Returns the batctrl temperature in millidegrees
798 */
ab8500_btemp_get_batctrl_temp(struct ab8500_btemp * btemp)799 int ab8500_btemp_get_batctrl_temp(struct ab8500_btemp *btemp)
800 {
801 return btemp->bat_temp * 1000;
802 }
803 EXPORT_SYMBOL(ab8500_btemp_get_batctrl_temp);
804
805 /**
806 * ab8500_btemp_get_property() - get the btemp properties
807 * @psy: pointer to the power_supply structure
808 * @psp: pointer to the power_supply_property structure
809 * @val: pointer to the power_supply_propval union
810 *
811 * This function gets called when an application tries to get the btemp
812 * properties by reading the sysfs files.
813 * online: presence of the battery
814 * present: presence of the battery
815 * technology: battery technology
816 * temp: battery temperature
817 * Returns error code in case of failure else 0(on success)
818 */
ab8500_btemp_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)819 static int ab8500_btemp_get_property(struct power_supply *psy,
820 enum power_supply_property psp,
821 union power_supply_propval *val)
822 {
823 struct ab8500_btemp *di = power_supply_get_drvdata(psy);
824
825 switch (psp) {
826 case POWER_SUPPLY_PROP_PRESENT:
827 case POWER_SUPPLY_PROP_ONLINE:
828 if (di->events.batt_rem)
829 val->intval = 0;
830 else
831 val->intval = 1;
832 break;
833 case POWER_SUPPLY_PROP_TECHNOLOGY:
834 val->intval = di->bm->bat_type[di->bm->batt_id].name;
835 break;
836 case POWER_SUPPLY_PROP_TEMP:
837 val->intval = ab8500_btemp_get_temp(di);
838 break;
839 default:
840 return -EINVAL;
841 }
842 return 0;
843 }
844
ab8500_btemp_get_ext_psy_data(struct device * dev,void * data)845 static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data)
846 {
847 struct power_supply *psy;
848 struct power_supply *ext = dev_get_drvdata(dev);
849 const char **supplicants = (const char **)ext->supplied_to;
850 struct ab8500_btemp *di;
851 union power_supply_propval ret;
852 int j;
853
854 psy = (struct power_supply *)data;
855 di = power_supply_get_drvdata(psy);
856
857 /*
858 * For all psy where the name of your driver
859 * appears in any supplied_to
860 */
861 j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
862 if (j < 0)
863 return 0;
864
865 /* Go through all properties for the psy */
866 for (j = 0; j < ext->desc->num_properties; j++) {
867 enum power_supply_property prop;
868 prop = ext->desc->properties[j];
869
870 if (power_supply_get_property(ext, prop, &ret))
871 continue;
872
873 switch (prop) {
874 case POWER_SUPPLY_PROP_PRESENT:
875 switch (ext->desc->type) {
876 case POWER_SUPPLY_TYPE_MAINS:
877 /* AC disconnected */
878 if (!ret.intval && di->events.ac_conn) {
879 di->events.ac_conn = false;
880 }
881 /* AC connected */
882 else if (ret.intval && !di->events.ac_conn) {
883 di->events.ac_conn = true;
884 if (!di->events.usb_conn)
885 ab8500_btemp_periodic(di, true);
886 }
887 break;
888 case POWER_SUPPLY_TYPE_USB:
889 /* USB disconnected */
890 if (!ret.intval && di->events.usb_conn) {
891 di->events.usb_conn = false;
892 }
893 /* USB connected */
894 else if (ret.intval && !di->events.usb_conn) {
895 di->events.usb_conn = true;
896 if (!di->events.ac_conn)
897 ab8500_btemp_periodic(di, true);
898 }
899 break;
900 default:
901 break;
902 }
903 break;
904 default:
905 break;
906 }
907 }
908 return 0;
909 }
910
911 /**
912 * ab8500_btemp_external_power_changed() - callback for power supply changes
913 * @psy: pointer to the structure power_supply
914 *
915 * This function is pointing to the function pointer external_power_changed
916 * of the structure power_supply.
917 * This function gets executed when there is a change in the external power
918 * supply to the btemp.
919 */
ab8500_btemp_external_power_changed(struct power_supply * psy)920 static void ab8500_btemp_external_power_changed(struct power_supply *psy)
921 {
922 struct ab8500_btemp *di = power_supply_get_drvdata(psy);
923
924 class_for_each_device(power_supply_class, NULL,
925 di->btemp_psy, ab8500_btemp_get_ext_psy_data);
926 }
927
928 /* ab8500 btemp driver interrupts and their respective isr */
929 static struct ab8500_btemp_interrupts ab8500_btemp_irq[] = {
930 {"BAT_CTRL_INDB", ab8500_btemp_batctrlindb_handler},
931 {"BTEMP_LOW", ab8500_btemp_templow_handler},
932 {"BTEMP_HIGH", ab8500_btemp_temphigh_handler},
933 {"BTEMP_LOW_MEDIUM", ab8500_btemp_lowmed_handler},
934 {"BTEMP_MEDIUM_HIGH", ab8500_btemp_medhigh_handler},
935 };
936
937 #if defined(CONFIG_PM)
ab8500_btemp_resume(struct platform_device * pdev)938 static int ab8500_btemp_resume(struct platform_device *pdev)
939 {
940 struct ab8500_btemp *di = platform_get_drvdata(pdev);
941
942 ab8500_btemp_periodic(di, true);
943
944 return 0;
945 }
946
ab8500_btemp_suspend(struct platform_device * pdev,pm_message_t state)947 static int ab8500_btemp_suspend(struct platform_device *pdev,
948 pm_message_t state)
949 {
950 struct ab8500_btemp *di = platform_get_drvdata(pdev);
951
952 ab8500_btemp_periodic(di, false);
953
954 return 0;
955 }
956 #else
957 #define ab8500_btemp_suspend NULL
958 #define ab8500_btemp_resume NULL
959 #endif
960
ab8500_btemp_remove(struct platform_device * pdev)961 static int ab8500_btemp_remove(struct platform_device *pdev)
962 {
963 struct ab8500_btemp *di = platform_get_drvdata(pdev);
964 int i, irq;
965
966 /* Disable interrupts */
967 for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
968 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
969 free_irq(irq, di);
970 }
971
972 /* Delete the work queue */
973 destroy_workqueue(di->btemp_wq);
974
975 flush_scheduled_work();
976 power_supply_unregister(di->btemp_psy);
977
978 return 0;
979 }
980
981 static char *supply_interface[] = {
982 "ab8500_chargalg",
983 "ab8500_fg",
984 };
985
986 static const struct power_supply_desc ab8500_btemp_desc = {
987 .name = "ab8500_btemp",
988 .type = POWER_SUPPLY_TYPE_BATTERY,
989 .properties = ab8500_btemp_props,
990 .num_properties = ARRAY_SIZE(ab8500_btemp_props),
991 .get_property = ab8500_btemp_get_property,
992 .external_power_changed = ab8500_btemp_external_power_changed,
993 };
994
ab8500_btemp_probe(struct platform_device * pdev)995 static int ab8500_btemp_probe(struct platform_device *pdev)
996 {
997 struct device_node *np = pdev->dev.of_node;
998 struct abx500_bm_data *plat = pdev->dev.platform_data;
999 struct power_supply_config psy_cfg = {};
1000 struct ab8500_btemp *di;
1001 int irq, i, ret = 0;
1002 u8 val;
1003
1004 di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1005 if (!di) {
1006 dev_err(&pdev->dev, "%s no mem for ab8500_btemp\n", __func__);
1007 return -ENOMEM;
1008 }
1009
1010 if (!plat) {
1011 dev_err(&pdev->dev, "no battery management data supplied\n");
1012 return -EINVAL;
1013 }
1014 di->bm = plat;
1015
1016 if (np) {
1017 ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
1018 if (ret) {
1019 dev_err(&pdev->dev, "failed to get battery information\n");
1020 return ret;
1021 }
1022 }
1023
1024 /* get parent data */
1025 di->dev = &pdev->dev;
1026 di->parent = dev_get_drvdata(pdev->dev.parent);
1027 di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
1028
1029 di->initialized = false;
1030
1031 psy_cfg.supplied_to = supply_interface;
1032 psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
1033 psy_cfg.drv_data = di;
1034
1035 /* Create a work queue for the btemp */
1036 di->btemp_wq =
1037 alloc_workqueue("ab8500_btemp_wq", WQ_MEM_RECLAIM, 0);
1038 if (di->btemp_wq == NULL) {
1039 dev_err(di->dev, "failed to create work queue\n");
1040 return -ENOMEM;
1041 }
1042
1043 /* Init work for measuring temperature periodically */
1044 INIT_DEFERRABLE_WORK(&di->btemp_periodic_work,
1045 ab8500_btemp_periodic_work);
1046
1047 /* Set BTEMP thermal limits. Low and Med are fixed */
1048 di->btemp_ranges.btemp_low_limit = BTEMP_THERMAL_LOW_LIMIT;
1049 di->btemp_ranges.btemp_med_limit = BTEMP_THERMAL_MED_LIMIT;
1050
1051 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1052 AB8500_BTEMP_HIGH_TH, &val);
1053 if (ret < 0) {
1054 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1055 goto free_btemp_wq;
1056 }
1057 switch (val) {
1058 case BTEMP_HIGH_TH_57_0:
1059 case BTEMP_HIGH_TH_57_1:
1060 di->btemp_ranges.btemp_high_limit =
1061 BTEMP_THERMAL_HIGH_LIMIT_57;
1062 break;
1063 case BTEMP_HIGH_TH_52:
1064 di->btemp_ranges.btemp_high_limit =
1065 BTEMP_THERMAL_HIGH_LIMIT_52;
1066 break;
1067 case BTEMP_HIGH_TH_62:
1068 di->btemp_ranges.btemp_high_limit =
1069 BTEMP_THERMAL_HIGH_LIMIT_62;
1070 break;
1071 }
1072
1073 /* Register BTEMP power supply class */
1074 di->btemp_psy = power_supply_register(di->dev, &ab8500_btemp_desc,
1075 &psy_cfg);
1076 if (IS_ERR(di->btemp_psy)) {
1077 dev_err(di->dev, "failed to register BTEMP psy\n");
1078 ret = PTR_ERR(di->btemp_psy);
1079 goto free_btemp_wq;
1080 }
1081
1082 /* Register interrupts */
1083 for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
1084 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1085 ret = request_threaded_irq(irq, NULL, ab8500_btemp_irq[i].isr,
1086 IRQF_SHARED | IRQF_NO_SUSPEND,
1087 ab8500_btemp_irq[i].name, di);
1088
1089 if (ret) {
1090 dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
1091 , ab8500_btemp_irq[i].name, irq, ret);
1092 goto free_irq;
1093 }
1094 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
1095 ab8500_btemp_irq[i].name, irq, ret);
1096 }
1097
1098 platform_set_drvdata(pdev, di);
1099
1100 /* Kick off periodic temperature measurements */
1101 ab8500_btemp_periodic(di, true);
1102 list_add_tail(&di->node, &ab8500_btemp_list);
1103
1104 return ret;
1105
1106 free_irq:
1107 power_supply_unregister(di->btemp_psy);
1108
1109 /* We also have to free all successfully registered irqs */
1110 for (i = i - 1; i >= 0; i--) {
1111 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1112 free_irq(irq, di);
1113 }
1114 free_btemp_wq:
1115 destroy_workqueue(di->btemp_wq);
1116 return ret;
1117 }
1118
1119 static const struct of_device_id ab8500_btemp_match[] = {
1120 { .compatible = "stericsson,ab8500-btemp", },
1121 { },
1122 };
1123
1124 static struct platform_driver ab8500_btemp_driver = {
1125 .probe = ab8500_btemp_probe,
1126 .remove = ab8500_btemp_remove,
1127 .suspend = ab8500_btemp_suspend,
1128 .resume = ab8500_btemp_resume,
1129 .driver = {
1130 .name = "ab8500-btemp",
1131 .of_match_table = ab8500_btemp_match,
1132 },
1133 };
1134
ab8500_btemp_init(void)1135 static int __init ab8500_btemp_init(void)
1136 {
1137 return platform_driver_register(&ab8500_btemp_driver);
1138 }
1139
ab8500_btemp_exit(void)1140 static void __exit ab8500_btemp_exit(void)
1141 {
1142 platform_driver_unregister(&ab8500_btemp_driver);
1143 }
1144
1145 device_initcall(ab8500_btemp_init);
1146 module_exit(ab8500_btemp_exit);
1147
1148 MODULE_LICENSE("GPL v2");
1149 MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
1150 MODULE_ALIAS("platform:ab8500-btemp");
1151 MODULE_DESCRIPTION("AB8500 battery temperature driver");
1152
