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/component.h>
17 #include <linux/interrupt.h>
18 #include <linux/delay.h>
19 #include <linux/slab.h>
20 #include <linux/platform_device.h>
21 #include <linux/power_supply.h>
22 #include <linux/completion.h>
23 #include <linux/workqueue.h>
24 #include <linux/jiffies.h>
25 #include <linux/of.h>
26 #include <linux/mfd/core.h>
27 #include <linux/mfd/abx500.h>
28 #include <linux/mfd/abx500/ab8500.h>
29 #include <linux/iio/consumer.h>
30 #include <linux/fixp-arith.h>
31
32 #include "ab8500-bm.h"
33
34 #define VTVOUT_V 1800
35
36 #define BTEMP_THERMAL_LOW_LIMIT -10
37 #define BTEMP_THERMAL_MED_LIMIT 0
38 #define BTEMP_THERMAL_HIGH_LIMIT_52 52
39 #define BTEMP_THERMAL_HIGH_LIMIT_57 57
40 #define BTEMP_THERMAL_HIGH_LIMIT_62 62
41
42 #define BTEMP_BATCTRL_CURR_SRC_7UA 7
43 #define BTEMP_BATCTRL_CURR_SRC_20UA 20
44
45 #define BTEMP_BATCTRL_CURR_SRC_16UA 16
46 #define BTEMP_BATCTRL_CURR_SRC_18UA 18
47
48 #define BTEMP_BATCTRL_CURR_SRC_60UA 60
49 #define BTEMP_BATCTRL_CURR_SRC_120UA 120
50
51 /**
52 * struct ab8500_btemp_interrupts - ab8500 interrupts
53 * @name: name of the interrupt
54 * @isr function pointer to the isr
55 */
56 struct ab8500_btemp_interrupts {
57 char *name;
58 irqreturn_t (*isr)(int irq, void *data);
59 };
60
61 struct ab8500_btemp_events {
62 bool batt_rem;
63 bool btemp_high;
64 bool btemp_medhigh;
65 bool btemp_lowmed;
66 bool btemp_low;
67 bool ac_conn;
68 bool usb_conn;
69 };
70
71 struct ab8500_btemp_ranges {
72 int btemp_high_limit;
73 int btemp_med_limit;
74 int btemp_low_limit;
75 };
76
77 /**
78 * struct ab8500_btemp - ab8500 BTEMP device information
79 * @dev: Pointer to the structure device
80 * @node: List of AB8500 BTEMPs, hence prepared for reentrance
81 * @curr_source: What current source we use, in uA
82 * @bat_temp: Dispatched battery temperature in degree Celsius
83 * @prev_bat_temp Last measured battery temperature in degree Celsius
84 * @parent: Pointer to the struct ab8500
85 * @adc_btemp_ball: ADC channel for the battery ball temperature
86 * @adc_bat_ctrl: ADC channel for the battery control
87 * @fg: Pointer to the struct fg
88 * @bm: Platform specific battery management information
89 * @btemp_psy: Structure for BTEMP specific battery properties
90 * @events: Structure for information about events triggered
91 * @btemp_ranges: Battery temperature range structure
92 * @btemp_wq: Work queue for measuring the temperature periodically
93 * @btemp_periodic_work: Work for measuring the temperature periodically
94 * @initialized: True if battery id read.
95 */
96 struct ab8500_btemp {
97 struct device *dev;
98 struct list_head node;
99 int curr_source;
100 int bat_temp;
101 int prev_bat_temp;
102 struct ab8500 *parent;
103 struct iio_channel *btemp_ball;
104 struct iio_channel *bat_ctrl;
105 struct ab8500_fg *fg;
106 struct ab8500_bm_data *bm;
107 struct power_supply *btemp_psy;
108 struct ab8500_btemp_events events;
109 struct ab8500_btemp_ranges btemp_ranges;
110 struct workqueue_struct *btemp_wq;
111 struct delayed_work btemp_periodic_work;
112 bool initialized;
113 };
114
115 /* BTEMP power supply properties */
116 static enum power_supply_property ab8500_btemp_props[] = {
117 POWER_SUPPLY_PROP_PRESENT,
118 POWER_SUPPLY_PROP_ONLINE,
119 POWER_SUPPLY_PROP_TECHNOLOGY,
120 POWER_SUPPLY_PROP_TEMP,
121 };
122
123 static LIST_HEAD(ab8500_btemp_list);
124
125 /**
126 * ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance
127 * @di: pointer to the ab8500_btemp structure
128 * @v_batctrl: measured batctrl voltage
129 * @inst_curr: measured instant current
130 *
131 * This function returns the battery resistance that is
132 * derived from the BATCTRL voltage.
133 * Returns value in Ohms.
134 */
ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp * di,int v_batctrl,int inst_curr)135 static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di,
136 int v_batctrl, int inst_curr)
137 {
138 int rbs;
139
140 if (is_ab8500_1p1_or_earlier(di->parent)) {
141 /*
142 * For ABB cut1.0 and 1.1 BAT_CTRL is internally
143 * connected to 1.8V through a 450k resistor
144 */
145 return (450000 * (v_batctrl)) / (1800 - v_batctrl);
146 }
147
148 if (di->bm->adc_therm == AB8500_ADC_THERM_BATCTRL) {
149 /*
150 * If the battery has internal NTC, we use the current
151 * source to calculate the resistance.
152 */
153 rbs = (v_batctrl * 1000
154 - di->bm->gnd_lift_resistance * inst_curr)
155 / di->curr_source;
156 } else {
157 /*
158 * BAT_CTRL is internally
159 * connected to 1.8V through a 80k resistor
160 */
161 rbs = (80000 * (v_batctrl)) / (1800 - v_batctrl);
162 }
163
164 return rbs;
165 }
166
167 /**
168 * ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage
169 * @di: pointer to the ab8500_btemp structure
170 *
171 * This function returns the voltage on BATCTRL. Returns value in mV.
172 */
ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp * di)173 static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp *di)
174 {
175 int vbtemp, ret;
176 static int prev;
177
178 ret = iio_read_channel_processed(di->bat_ctrl, &vbtemp);
179 if (ret < 0) {
180 dev_err(di->dev,
181 "%s ADC conversion failed, using previous value",
182 __func__);
183 return prev;
184 }
185 prev = vbtemp;
186 return vbtemp;
187 }
188
189 /**
190 * ab8500_btemp_curr_source_enable() - enable/disable batctrl current source
191 * @di: pointer to the ab8500_btemp structure
192 * @enable: enable or disable the current source
193 *
194 * Enable or disable the current sources for the BatCtrl AD channel
195 */
ab8500_btemp_curr_source_enable(struct ab8500_btemp * di,bool enable)196 static int ab8500_btemp_curr_source_enable(struct ab8500_btemp *di,
197 bool enable)
198 {
199 int curr;
200 int ret = 0;
201
202 /*
203 * BATCTRL current sources are included on AB8500 cut2.0
204 * and future versions
205 */
206 if (is_ab8500_1p1_or_earlier(di->parent))
207 return 0;
208
209 /* Only do this for batteries with internal NTC */
210 if (di->bm->adc_therm == AB8500_ADC_THERM_BATCTRL && enable) {
211
212 if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_7UA)
213 curr = BAT_CTRL_7U_ENA;
214 else
215 curr = BAT_CTRL_20U_ENA;
216
217 dev_dbg(di->dev, "Set BATCTRL %duA\n", di->curr_source);
218
219 ret = abx500_mask_and_set_register_interruptible(di->dev,
220 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
221 FORCE_BAT_CTRL_CMP_HIGH, FORCE_BAT_CTRL_CMP_HIGH);
222 if (ret) {
223 dev_err(di->dev, "%s failed setting cmp_force\n",
224 __func__);
225 return ret;
226 }
227
228 /*
229 * We have to wait one 32kHz cycle before enabling
230 * the current source, since ForceBatCtrlCmpHigh needs
231 * to be written in a separate cycle
232 */
233 udelay(32);
234
235 ret = abx500_set_register_interruptible(di->dev,
236 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
237 FORCE_BAT_CTRL_CMP_HIGH | curr);
238 if (ret) {
239 dev_err(di->dev, "%s failed enabling current source\n",
240 __func__);
241 goto disable_curr_source;
242 }
243 } else if (di->bm->adc_therm == AB8500_ADC_THERM_BATCTRL && !enable) {
244 dev_dbg(di->dev, "Disable BATCTRL curr source\n");
245
246 /* Write 0 to the curr bits */
247 ret = abx500_mask_and_set_register_interruptible(
248 di->dev,
249 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
250 BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
251 ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
252
253 if (ret) {
254 dev_err(di->dev, "%s failed disabling current source\n",
255 __func__);
256 goto disable_curr_source;
257 }
258
259 /* Enable Pull-Up and comparator */
260 ret = abx500_mask_and_set_register_interruptible(di->dev,
261 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
262 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
263 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
264 if (ret) {
265 dev_err(di->dev, "%s failed enabling PU and comp\n",
266 __func__);
267 goto enable_pu_comp;
268 }
269
270 /*
271 * We have to wait one 32kHz cycle before disabling
272 * ForceBatCtrlCmpHigh since this needs to be written
273 * in a separate cycle
274 */
275 udelay(32);
276
277 /* Disable 'force comparator' */
278 ret = abx500_mask_and_set_register_interruptible(di->dev,
279 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
280 FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
281 if (ret) {
282 dev_err(di->dev, "%s failed disabling force comp\n",
283 __func__);
284 goto disable_force_comp;
285 }
286 }
287 return ret;
288
289 /*
290 * We have to try unsetting FORCE_BAT_CTRL_CMP_HIGH one more time
291 * if we got an error above
292 */
293 disable_curr_source:
294 /* Write 0 to the curr bits */
295 ret = abx500_mask_and_set_register_interruptible(di->dev,
296 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
297 BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
298 ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
299
300 if (ret) {
301 dev_err(di->dev, "%s failed disabling current source\n",
302 __func__);
303 return ret;
304 }
305 enable_pu_comp:
306 /* Enable Pull-Up and comparator */
307 ret = abx500_mask_and_set_register_interruptible(di->dev,
308 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
309 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
310 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
311 if (ret) {
312 dev_err(di->dev, "%s failed enabling PU and comp\n",
313 __func__);
314 return ret;
315 }
316
317 disable_force_comp:
318 /*
319 * We have to wait one 32kHz cycle before disabling
320 * ForceBatCtrlCmpHigh since this needs to be written
321 * in a separate cycle
322 */
323 udelay(32);
324
325 /* Disable 'force comparator' */
326 ret = abx500_mask_and_set_register_interruptible(di->dev,
327 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
328 FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
329 if (ret) {
330 dev_err(di->dev, "%s failed disabling force comp\n",
331 __func__);
332 return ret;
333 }
334
335 return ret;
336 }
337
338 /**
339 * ab8500_btemp_get_batctrl_res() - get battery resistance
340 * @di: pointer to the ab8500_btemp structure
341 *
342 * This function returns the battery pack identification resistance.
343 * Returns value in Ohms.
344 */
ab8500_btemp_get_batctrl_res(struct ab8500_btemp * di)345 static int ab8500_btemp_get_batctrl_res(struct ab8500_btemp *di)
346 {
347 int ret;
348 int batctrl = 0;
349 int res;
350 int inst_curr;
351 int i;
352
353 /*
354 * BATCTRL current sources are included on AB8500 cut2.0
355 * and future versions
356 */
357 ret = ab8500_btemp_curr_source_enable(di, true);
358 if (ret) {
359 dev_err(di->dev, "%s curr source enabled failed\n", __func__);
360 return ret;
361 }
362
363 if (!di->fg)
364 di->fg = ab8500_fg_get();
365 if (!di->fg) {
366 dev_err(di->dev, "No fg found\n");
367 return -EINVAL;
368 }
369
370 ret = ab8500_fg_inst_curr_start(di->fg);
371
372 if (ret) {
373 dev_err(di->dev, "Failed to start current measurement\n");
374 return ret;
375 }
376
377 do {
378 msleep(20);
379 } while (!ab8500_fg_inst_curr_started(di->fg));
380
381 i = 0;
382
383 do {
384 batctrl += ab8500_btemp_read_batctrl_voltage(di);
385 i++;
386 msleep(20);
387 } while (!ab8500_fg_inst_curr_done(di->fg));
388 batctrl /= i;
389
390 ret = ab8500_fg_inst_curr_finalize(di->fg, &inst_curr);
391 if (ret) {
392 dev_err(di->dev, "Failed to finalize current measurement\n");
393 return ret;
394 }
395
396 res = ab8500_btemp_batctrl_volt_to_res(di, batctrl, inst_curr);
397
398 ret = ab8500_btemp_curr_source_enable(di, false);
399 if (ret) {
400 dev_err(di->dev, "%s curr source disable failed\n", __func__);
401 return ret;
402 }
403
404 dev_dbg(di->dev, "%s batctrl: %d res: %d inst_curr: %d samples: %d\n",
405 __func__, batctrl, res, inst_curr, i);
406
407 return res;
408 }
409
410 /**
411 * ab8500_btemp_res_to_temp() - resistance to temperature
412 * @di: pointer to the ab8500_btemp structure
413 * @tbl: pointer to the resiatance to temperature table
414 * @tbl_size: size of the resistance to temperature table
415 * @res: resistance to calculate the temperature from
416 *
417 * This function returns the battery temperature in degrees Celsius
418 * based on the NTC resistance.
419 */
ab8500_btemp_res_to_temp(struct ab8500_btemp * di,const struct ab8500_res_to_temp * tbl,int tbl_size,int res)420 static int ab8500_btemp_res_to_temp(struct ab8500_btemp *di,
421 const struct ab8500_res_to_temp *tbl, int tbl_size, int res)
422 {
423 int i;
424 /*
425 * Calculate the formula for the straight line
426 * Simple interpolation if we are within
427 * the resistance table limits, extrapolate
428 * if resistance is outside the limits.
429 */
430 if (res > tbl[0].resist)
431 i = 0;
432 else if (res <= tbl[tbl_size - 1].resist)
433 i = tbl_size - 2;
434 else {
435 i = 0;
436 while (!(res <= tbl[i].resist &&
437 res > tbl[i + 1].resist))
438 i++;
439 }
440
441 return fixp_linear_interpolate(tbl[i].resist, tbl[i].temp,
442 tbl[i + 1].resist, tbl[i + 1].temp,
443 res);
444 }
445
446 /**
447 * ab8500_btemp_measure_temp() - measure battery temperature
448 * @di: pointer to the ab8500_btemp structure
449 *
450 * Returns battery temperature (on success) else the previous temperature
451 */
ab8500_btemp_measure_temp(struct ab8500_btemp * di)452 static int ab8500_btemp_measure_temp(struct ab8500_btemp *di)
453 {
454 int temp, ret;
455 static int prev;
456 int rbat, rntc, vntc;
457 u8 id;
458
459 id = di->bm->batt_id;
460
461 if (di->bm->adc_therm == AB8500_ADC_THERM_BATCTRL &&
462 id != BATTERY_UNKNOWN) {
463
464 rbat = ab8500_btemp_get_batctrl_res(di);
465 if (rbat < 0) {
466 dev_err(di->dev, "%s get batctrl res failed\n",
467 __func__);
468 /*
469 * Return out-of-range temperature so that
470 * charging is stopped
471 */
472 return BTEMP_THERMAL_LOW_LIMIT;
473 }
474
475 temp = ab8500_btemp_res_to_temp(di,
476 di->bm->bat_type[id].r_to_t_tbl,
477 di->bm->bat_type[id].n_temp_tbl_elements, rbat);
478 } else {
479 ret = iio_read_channel_processed(di->btemp_ball, &vntc);
480 if (ret < 0) {
481 dev_err(di->dev,
482 "%s ADC conversion failed,"
483 " using previous value\n", __func__);
484 return prev;
485 }
486 /*
487 * The PCB NTC is sourced from VTVOUT via a 230kOhm
488 * resistor.
489 */
490 rntc = 230000 * vntc / (VTVOUT_V - vntc);
491
492 temp = ab8500_btemp_res_to_temp(di,
493 di->bm->bat_type[id].r_to_t_tbl,
494 di->bm->bat_type[id].n_temp_tbl_elements, rntc);
495 prev = temp;
496 }
497 dev_dbg(di->dev, "Battery temperature is %d\n", temp);
498 return temp;
499 }
500
501 /**
502 * ab8500_btemp_id() - Identify the connected battery
503 * @di: pointer to the ab8500_btemp structure
504 *
505 * This function will try to identify the battery by reading the ID
506 * resistor. Some brands use a combined ID resistor with a NTC resistor to
507 * both be able to identify and to read the temperature of it.
508 */
ab8500_btemp_id(struct ab8500_btemp * di)509 static int ab8500_btemp_id(struct ab8500_btemp *di)
510 {
511 int res;
512 u8 i;
513
514 di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA;
515 di->bm->batt_id = BATTERY_UNKNOWN;
516
517 res = ab8500_btemp_get_batctrl_res(di);
518 if (res < 0) {
519 dev_err(di->dev, "%s get batctrl res failed\n", __func__);
520 return -ENXIO;
521 }
522
523 /* BATTERY_UNKNOWN is defined on position 0, skip it! */
524 for (i = BATTERY_UNKNOWN + 1; i < di->bm->n_btypes; i++) {
525 if ((res <= di->bm->bat_type[i].resis_high) &&
526 (res >= di->bm->bat_type[i].resis_low)) {
527 dev_dbg(di->dev, "Battery detected on %s"
528 " low %d < res %d < high: %d"
529 " index: %d\n",
530 di->bm->adc_therm == AB8500_ADC_THERM_BATCTRL ?
531 "BATCTRL" : "BATTEMP",
532 di->bm->bat_type[i].resis_low, res,
533 di->bm->bat_type[i].resis_high, i);
534
535 di->bm->batt_id = i;
536 break;
537 }
538 }
539
540 if (di->bm->batt_id == BATTERY_UNKNOWN) {
541 dev_warn(di->dev, "Battery identified as unknown"
542 ", resistance %d Ohm\n", res);
543 return -ENXIO;
544 }
545
546 /*
547 * We only have to change current source if the
548 * detected type is Type 1.
549 */
550 if (di->bm->adc_therm == AB8500_ADC_THERM_BATCTRL &&
551 di->bm->batt_id == 1) {
552 dev_dbg(di->dev, "Set BATCTRL current source to 20uA\n");
553 di->curr_source = BTEMP_BATCTRL_CURR_SRC_20UA;
554 }
555
556 return di->bm->batt_id;
557 }
558
559 /**
560 * ab8500_btemp_periodic_work() - Measuring the temperature periodically
561 * @work: pointer to the work_struct structure
562 *
563 * Work function for measuring the temperature periodically
564 */
ab8500_btemp_periodic_work(struct work_struct * work)565 static void ab8500_btemp_periodic_work(struct work_struct *work)
566 {
567 int interval;
568 int bat_temp;
569 struct ab8500_btemp *di = container_of(work,
570 struct ab8500_btemp, btemp_periodic_work.work);
571
572 if (!di->initialized) {
573 /* Identify the battery */
574 if (ab8500_btemp_id(di) < 0)
575 dev_warn(di->dev, "failed to identify the battery\n");
576 }
577
578 bat_temp = ab8500_btemp_measure_temp(di);
579 /*
580 * Filter battery temperature.
581 * Allow direct updates on temperature only if two samples result in
582 * same temperature. Else only allow 1 degree change from previous
583 * reported value in the direction of the new measurement.
584 */
585 if ((bat_temp == di->prev_bat_temp) || !di->initialized) {
586 if ((di->bat_temp != di->prev_bat_temp) || !di->initialized) {
587 di->initialized = true;
588 di->bat_temp = bat_temp;
589 power_supply_changed(di->btemp_psy);
590 }
591 } else if (bat_temp < di->prev_bat_temp) {
592 di->bat_temp--;
593 power_supply_changed(di->btemp_psy);
594 } else if (bat_temp > di->prev_bat_temp) {
595 di->bat_temp++;
596 power_supply_changed(di->btemp_psy);
597 }
598 di->prev_bat_temp = bat_temp;
599
600 if (di->events.ac_conn || di->events.usb_conn)
601 interval = di->bm->temp_interval_chg;
602 else
603 interval = di->bm->temp_interval_nochg;
604
605 /* Schedule a new measurement */
606 queue_delayed_work(di->btemp_wq,
607 &di->btemp_periodic_work,
608 round_jiffies(interval * HZ));
609 }
610
611 /**
612 * ab8500_btemp_batctrlindb_handler() - battery removal detected
613 * @irq: interrupt number
614 * @_di: void pointer that has to address of ab8500_btemp
615 *
616 * Returns IRQ status(IRQ_HANDLED)
617 */
ab8500_btemp_batctrlindb_handler(int irq,void * _di)618 static irqreturn_t ab8500_btemp_batctrlindb_handler(int irq, void *_di)
619 {
620 struct ab8500_btemp *di = _di;
621 dev_err(di->dev, "Battery removal detected!\n");
622
623 di->events.batt_rem = true;
624 power_supply_changed(di->btemp_psy);
625
626 return IRQ_HANDLED;
627 }
628
629 /**
630 * ab8500_btemp_templow_handler() - battery temp lower than 10 degrees
631 * @irq: interrupt number
632 * @_di: void pointer that has to address of ab8500_btemp
633 *
634 * Returns IRQ status(IRQ_HANDLED)
635 */
ab8500_btemp_templow_handler(int irq,void * _di)636 static irqreturn_t ab8500_btemp_templow_handler(int irq, void *_di)
637 {
638 struct ab8500_btemp *di = _di;
639
640 if (is_ab8500_3p3_or_earlier(di->parent)) {
641 dev_dbg(di->dev, "Ignore false btemp low irq"
642 " for ABB cut 1.0, 1.1, 2.0 and 3.3\n");
643 } else {
644 dev_crit(di->dev, "Battery temperature lower than -10deg c\n");
645
646 di->events.btemp_low = true;
647 di->events.btemp_high = false;
648 di->events.btemp_medhigh = false;
649 di->events.btemp_lowmed = false;
650 power_supply_changed(di->btemp_psy);
651 }
652
653 return IRQ_HANDLED;
654 }
655
656 /**
657 * ab8500_btemp_temphigh_handler() - battery temp higher than max temp
658 * @irq: interrupt number
659 * @_di: void pointer that has to address of ab8500_btemp
660 *
661 * Returns IRQ status(IRQ_HANDLED)
662 */
ab8500_btemp_temphigh_handler(int irq,void * _di)663 static irqreturn_t ab8500_btemp_temphigh_handler(int irq, void *_di)
664 {
665 struct ab8500_btemp *di = _di;
666
667 dev_crit(di->dev, "Battery temperature is higher than MAX temp\n");
668
669 di->events.btemp_high = true;
670 di->events.btemp_medhigh = false;
671 di->events.btemp_lowmed = false;
672 di->events.btemp_low = false;
673 power_supply_changed(di->btemp_psy);
674
675 return IRQ_HANDLED;
676 }
677
678 /**
679 * ab8500_btemp_lowmed_handler() - battery temp between low and medium
680 * @irq: interrupt number
681 * @_di: void pointer that has to address of ab8500_btemp
682 *
683 * Returns IRQ status(IRQ_HANDLED)
684 */
ab8500_btemp_lowmed_handler(int irq,void * _di)685 static irqreturn_t ab8500_btemp_lowmed_handler(int irq, void *_di)
686 {
687 struct ab8500_btemp *di = _di;
688
689 dev_dbg(di->dev, "Battery temperature is between low and medium\n");
690
691 di->events.btemp_lowmed = true;
692 di->events.btemp_medhigh = false;
693 di->events.btemp_high = false;
694 di->events.btemp_low = false;
695 power_supply_changed(di->btemp_psy);
696
697 return IRQ_HANDLED;
698 }
699
700 /**
701 * ab8500_btemp_medhigh_handler() - battery temp between medium and high
702 * @irq: interrupt number
703 * @_di: void pointer that has to address of ab8500_btemp
704 *
705 * Returns IRQ status(IRQ_HANDLED)
706 */
ab8500_btemp_medhigh_handler(int irq,void * _di)707 static irqreturn_t ab8500_btemp_medhigh_handler(int irq, void *_di)
708 {
709 struct ab8500_btemp *di = _di;
710
711 dev_dbg(di->dev, "Battery temperature is between medium and high\n");
712
713 di->events.btemp_medhigh = true;
714 di->events.btemp_lowmed = false;
715 di->events.btemp_high = false;
716 di->events.btemp_low = false;
717 power_supply_changed(di->btemp_psy);
718
719 return IRQ_HANDLED;
720 }
721
722 /**
723 * ab8500_btemp_periodic() - Periodic temperature measurements
724 * @di: pointer to the ab8500_btemp structure
725 * @enable: enable or disable periodic temperature measurements
726 *
727 * Starts of stops periodic temperature measurements. Periodic measurements
728 * should only be done when a charger is connected.
729 */
ab8500_btemp_periodic(struct ab8500_btemp * di,bool enable)730 static void ab8500_btemp_periodic(struct ab8500_btemp *di,
731 bool enable)
732 {
733 dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n",
734 enable);
735 /*
736 * Make sure a new measurement is done directly by cancelling
737 * any pending work
738 */
739 cancel_delayed_work_sync(&di->btemp_periodic_work);
740
741 if (enable)
742 queue_delayed_work(di->btemp_wq, &di->btemp_periodic_work, 0);
743 }
744
745 /**
746 * ab8500_btemp_get_temp() - get battery temperature
747 * @di: pointer to the ab8500_btemp structure
748 *
749 * Returns battery temperature
750 */
ab8500_btemp_get_temp(struct ab8500_btemp * di)751 static int ab8500_btemp_get_temp(struct ab8500_btemp *di)
752 {
753 int temp = 0;
754
755 /*
756 * The BTEMP events are not reliabe on AB8500 cut3.3
757 * and prior versions
758 */
759 if (is_ab8500_3p3_or_earlier(di->parent)) {
760 temp = di->bat_temp * 10;
761 } else {
762 if (di->events.btemp_low) {
763 if (temp > di->btemp_ranges.btemp_low_limit)
764 temp = di->btemp_ranges.btemp_low_limit * 10;
765 else
766 temp = di->bat_temp * 10;
767 } else if (di->events.btemp_high) {
768 if (temp < di->btemp_ranges.btemp_high_limit)
769 temp = di->btemp_ranges.btemp_high_limit * 10;
770 else
771 temp = di->bat_temp * 10;
772 } else if (di->events.btemp_lowmed) {
773 if (temp > di->btemp_ranges.btemp_med_limit)
774 temp = di->btemp_ranges.btemp_med_limit * 10;
775 else
776 temp = di->bat_temp * 10;
777 } else if (di->events.btemp_medhigh) {
778 if (temp < di->btemp_ranges.btemp_med_limit)
779 temp = di->btemp_ranges.btemp_med_limit * 10;
780 else
781 temp = di->bat_temp * 10;
782 } else
783 temp = di->bat_temp * 10;
784 }
785 return temp;
786 }
787
788 /**
789 * ab8500_btemp_get_property() - get the btemp properties
790 * @psy: pointer to the power_supply structure
791 * @psp: pointer to the power_supply_property structure
792 * @val: pointer to the power_supply_propval union
793 *
794 * This function gets called when an application tries to get the btemp
795 * properties by reading the sysfs files.
796 * online: presence of the battery
797 * present: presence of the battery
798 * technology: battery technology
799 * temp: battery temperature
800 * Returns error code in case of failure else 0(on success)
801 */
ab8500_btemp_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)802 static int ab8500_btemp_get_property(struct power_supply *psy,
803 enum power_supply_property psp,
804 union power_supply_propval *val)
805 {
806 struct ab8500_btemp *di = power_supply_get_drvdata(psy);
807
808 switch (psp) {
809 case POWER_SUPPLY_PROP_PRESENT:
810 case POWER_SUPPLY_PROP_ONLINE:
811 if (di->events.batt_rem)
812 val->intval = 0;
813 else
814 val->intval = 1;
815 break;
816 case POWER_SUPPLY_PROP_TECHNOLOGY:
817 val->intval = di->bm->bat_type[di->bm->batt_id].name;
818 break;
819 case POWER_SUPPLY_PROP_TEMP:
820 val->intval = ab8500_btemp_get_temp(di);
821 break;
822 default:
823 return -EINVAL;
824 }
825 return 0;
826 }
827
ab8500_btemp_get_ext_psy_data(struct device * dev,void * data)828 static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data)
829 {
830 struct power_supply *psy;
831 struct power_supply *ext = dev_get_drvdata(dev);
832 const char **supplicants = (const char **)ext->supplied_to;
833 struct ab8500_btemp *di;
834 union power_supply_propval ret;
835 int j;
836
837 psy = (struct power_supply *)data;
838 di = power_supply_get_drvdata(psy);
839
840 /*
841 * For all psy where the name of your driver
842 * appears in any supplied_to
843 */
844 j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
845 if (j < 0)
846 return 0;
847
848 /* Go through all properties for the psy */
849 for (j = 0; j < ext->desc->num_properties; j++) {
850 enum power_supply_property prop;
851 prop = ext->desc->properties[j];
852
853 if (power_supply_get_property(ext, prop, &ret))
854 continue;
855
856 switch (prop) {
857 case POWER_SUPPLY_PROP_PRESENT:
858 switch (ext->desc->type) {
859 case POWER_SUPPLY_TYPE_MAINS:
860 /* AC disconnected */
861 if (!ret.intval && di->events.ac_conn) {
862 di->events.ac_conn = false;
863 }
864 /* AC connected */
865 else if (ret.intval && !di->events.ac_conn) {
866 di->events.ac_conn = true;
867 if (!di->events.usb_conn)
868 ab8500_btemp_periodic(di, true);
869 }
870 break;
871 case POWER_SUPPLY_TYPE_USB:
872 /* USB disconnected */
873 if (!ret.intval && di->events.usb_conn) {
874 di->events.usb_conn = false;
875 }
876 /* USB connected */
877 else if (ret.intval && !di->events.usb_conn) {
878 di->events.usb_conn = true;
879 if (!di->events.ac_conn)
880 ab8500_btemp_periodic(di, true);
881 }
882 break;
883 default:
884 break;
885 }
886 break;
887 default:
888 break;
889 }
890 }
891 return 0;
892 }
893
894 /**
895 * ab8500_btemp_external_power_changed() - callback for power supply changes
896 * @psy: pointer to the structure power_supply
897 *
898 * This function is pointing to the function pointer external_power_changed
899 * of the structure power_supply.
900 * This function gets executed when there is a change in the external power
901 * supply to the btemp.
902 */
ab8500_btemp_external_power_changed(struct power_supply * psy)903 static void ab8500_btemp_external_power_changed(struct power_supply *psy)
904 {
905 class_for_each_device(power_supply_class, NULL, psy,
906 ab8500_btemp_get_ext_psy_data);
907 }
908
909 /* ab8500 btemp driver interrupts and their respective isr */
910 static struct ab8500_btemp_interrupts ab8500_btemp_irq[] = {
911 {"BAT_CTRL_INDB", ab8500_btemp_batctrlindb_handler},
912 {"BTEMP_LOW", ab8500_btemp_templow_handler},
913 {"BTEMP_HIGH", ab8500_btemp_temphigh_handler},
914 {"BTEMP_LOW_MEDIUM", ab8500_btemp_lowmed_handler},
915 {"BTEMP_MEDIUM_HIGH", ab8500_btemp_medhigh_handler},
916 };
917
ab8500_btemp_resume(struct device * dev)918 static int __maybe_unused ab8500_btemp_resume(struct device *dev)
919 {
920 struct ab8500_btemp *di = dev_get_drvdata(dev);
921
922 ab8500_btemp_periodic(di, true);
923
924 return 0;
925 }
926
ab8500_btemp_suspend(struct device * dev)927 static int __maybe_unused ab8500_btemp_suspend(struct device *dev)
928 {
929 struct ab8500_btemp *di = dev_get_drvdata(dev);
930
931 ab8500_btemp_periodic(di, false);
932
933 return 0;
934 }
935
936 static char *supply_interface[] = {
937 "ab8500_chargalg",
938 "ab8500_fg",
939 };
940
941 static const struct power_supply_desc ab8500_btemp_desc = {
942 .name = "ab8500_btemp",
943 .type = POWER_SUPPLY_TYPE_BATTERY,
944 .properties = ab8500_btemp_props,
945 .num_properties = ARRAY_SIZE(ab8500_btemp_props),
946 .get_property = ab8500_btemp_get_property,
947 .external_power_changed = ab8500_btemp_external_power_changed,
948 };
949
ab8500_btemp_bind(struct device * dev,struct device * master,void * data)950 static int ab8500_btemp_bind(struct device *dev, struct device *master,
951 void *data)
952 {
953 struct ab8500_btemp *di = dev_get_drvdata(dev);
954
955 /* Create a work queue for the btemp */
956 di->btemp_wq =
957 alloc_workqueue("ab8500_btemp_wq", WQ_MEM_RECLAIM, 0);
958 if (di->btemp_wq == NULL) {
959 dev_err(dev, "failed to create work queue\n");
960 return -ENOMEM;
961 }
962
963 /* Kick off periodic temperature measurements */
964 ab8500_btemp_periodic(di, true);
965
966 return 0;
967 }
968
ab8500_btemp_unbind(struct device * dev,struct device * master,void * data)969 static void ab8500_btemp_unbind(struct device *dev, struct device *master,
970 void *data)
971 {
972 struct ab8500_btemp *di = dev_get_drvdata(dev);
973
974 /* Delete the work queue */
975 destroy_workqueue(di->btemp_wq);
976 flush_scheduled_work();
977 }
978
979 static const struct component_ops ab8500_btemp_component_ops = {
980 .bind = ab8500_btemp_bind,
981 .unbind = ab8500_btemp_unbind,
982 };
983
ab8500_btemp_probe(struct platform_device * pdev)984 static int ab8500_btemp_probe(struct platform_device *pdev)
985 {
986 struct power_supply_config psy_cfg = {};
987 struct device *dev = &pdev->dev;
988 struct ab8500_btemp *di;
989 int irq, i, ret = 0;
990 u8 val;
991
992 di = devm_kzalloc(dev, sizeof(*di), GFP_KERNEL);
993 if (!di)
994 return -ENOMEM;
995
996 di->bm = &ab8500_bm_data;
997
998 /* get parent data */
999 di->dev = dev;
1000 di->parent = dev_get_drvdata(pdev->dev.parent);
1001
1002 /* Get ADC channels */
1003 di->btemp_ball = devm_iio_channel_get(dev, "btemp_ball");
1004 if (IS_ERR(di->btemp_ball)) {
1005 ret = dev_err_probe(dev, PTR_ERR(di->btemp_ball),
1006 "failed to get BTEMP BALL ADC channel\n");
1007 return ret;
1008 }
1009 di->bat_ctrl = devm_iio_channel_get(dev, "bat_ctrl");
1010 if (IS_ERR(di->bat_ctrl)) {
1011 ret = dev_err_probe(dev, PTR_ERR(di->bat_ctrl),
1012 "failed to get BAT CTRL ADC channel\n");
1013 return ret;
1014 }
1015
1016 di->initialized = false;
1017
1018 psy_cfg.supplied_to = supply_interface;
1019 psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
1020 psy_cfg.drv_data = di;
1021
1022 /* Init work for measuring temperature periodically */
1023 INIT_DEFERRABLE_WORK(&di->btemp_periodic_work,
1024 ab8500_btemp_periodic_work);
1025
1026 /* Set BTEMP thermal limits. Low and Med are fixed */
1027 di->btemp_ranges.btemp_low_limit = BTEMP_THERMAL_LOW_LIMIT;
1028 di->btemp_ranges.btemp_med_limit = BTEMP_THERMAL_MED_LIMIT;
1029
1030 ret = abx500_get_register_interruptible(dev, AB8500_CHARGER,
1031 AB8500_BTEMP_HIGH_TH, &val);
1032 if (ret < 0) {
1033 dev_err(dev, "%s ab8500 read failed\n", __func__);
1034 return ret;
1035 }
1036 switch (val) {
1037 case BTEMP_HIGH_TH_57_0:
1038 case BTEMP_HIGH_TH_57_1:
1039 di->btemp_ranges.btemp_high_limit =
1040 BTEMP_THERMAL_HIGH_LIMIT_57;
1041 break;
1042 case BTEMP_HIGH_TH_52:
1043 di->btemp_ranges.btemp_high_limit =
1044 BTEMP_THERMAL_HIGH_LIMIT_52;
1045 break;
1046 case BTEMP_HIGH_TH_62:
1047 di->btemp_ranges.btemp_high_limit =
1048 BTEMP_THERMAL_HIGH_LIMIT_62;
1049 break;
1050 }
1051
1052 /* Register BTEMP power supply class */
1053 di->btemp_psy = devm_power_supply_register(dev, &ab8500_btemp_desc,
1054 &psy_cfg);
1055 if (IS_ERR(di->btemp_psy)) {
1056 dev_err(dev, "failed to register BTEMP psy\n");
1057 return PTR_ERR(di->btemp_psy);
1058 }
1059
1060 /* Register interrupts */
1061 for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
1062 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1063 if (irq < 0)
1064 return irq;
1065
1066 ret = devm_request_threaded_irq(dev, irq, NULL,
1067 ab8500_btemp_irq[i].isr,
1068 IRQF_SHARED | IRQF_NO_SUSPEND | IRQF_ONESHOT,
1069 ab8500_btemp_irq[i].name, di);
1070
1071 if (ret) {
1072 dev_err(dev, "failed to request %s IRQ %d: %d\n"
1073 , ab8500_btemp_irq[i].name, irq, ret);
1074 return ret;
1075 }
1076 dev_dbg(dev, "Requested %s IRQ %d: %d\n",
1077 ab8500_btemp_irq[i].name, irq, ret);
1078 }
1079
1080 platform_set_drvdata(pdev, di);
1081
1082 list_add_tail(&di->node, &ab8500_btemp_list);
1083
1084 return component_add(dev, &ab8500_btemp_component_ops);
1085 }
1086
ab8500_btemp_remove(struct platform_device * pdev)1087 static int ab8500_btemp_remove(struct platform_device *pdev)
1088 {
1089 component_del(&pdev->dev, &ab8500_btemp_component_ops);
1090
1091 return 0;
1092 }
1093
1094 static SIMPLE_DEV_PM_OPS(ab8500_btemp_pm_ops, ab8500_btemp_suspend, ab8500_btemp_resume);
1095
1096 static const struct of_device_id ab8500_btemp_match[] = {
1097 { .compatible = "stericsson,ab8500-btemp", },
1098 { },
1099 };
1100 MODULE_DEVICE_TABLE(of, ab8500_btemp_match);
1101
1102 struct platform_driver ab8500_btemp_driver = {
1103 .probe = ab8500_btemp_probe,
1104 .remove = ab8500_btemp_remove,
1105 .driver = {
1106 .name = "ab8500-btemp",
1107 .of_match_table = ab8500_btemp_match,
1108 .pm = &ab8500_btemp_pm_ops,
1109 },
1110 };
1111 MODULE_LICENSE("GPL v2");
1112 MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
1113 MODULE_ALIAS("platform:ab8500-btemp");
1114 MODULE_DESCRIPTION("AB8500 battery temperature driver");
1115