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path: root/drivers/power/supply/ab8500_btemp.c
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-rw-r--r--drivers/power/supply/ab8500_btemp.c1212
1 files changed, 1212 insertions, 0 deletions
diff --git a/drivers/power/supply/ab8500_btemp.c b/drivers/power/supply/ab8500_btemp.c
new file mode 100644
index 000000000000..6ffdc18f2599
--- /dev/null
+++ b/drivers/power/supply/ab8500_btemp.c
@@ -0,0 +1,1212 @@
1/*
2 * Copyright (C) ST-Ericsson SA 2012
3 *
4 * Battery temperature driver for AB8500
5 *
6 * License Terms: GNU General Public License v2
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 */
53struct ab8500_btemp_interrupts {
54 char *name;
55 irqreturn_t (*isr)(int irq, void *data);
56};
57
58struct 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
68struct 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 Celcius
80 * @prev_bat_temp Last measured battery temperature in degree Celcius
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 */
92struct 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 */
111static 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
118static 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 */
124struct ab8500_btemp *ab8500_btemp_get(void)
125{
126 struct ab8500_btemp *btemp;
127 btemp = list_first_entry(&ab8500_btemp_list, struct ab8500_btemp, node);
128
129 return btemp;
130}
131EXPORT_SYMBOL(ab8500_btemp_get);
132
133/**
134 * ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance
135 * @di: pointer to the ab8500_btemp structure
136 * @v_batctrl: measured batctrl voltage
137 * @inst_curr: measured instant current
138 *
139 * This function returns the battery resistance that is
140 * derived from the BATCTRL voltage.
141 * Returns value in Ohms.
142 */
143static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di,
144 int v_batctrl, int inst_curr)
145{
146 int rbs;
147
148 if (is_ab8500_1p1_or_earlier(di->parent)) {
149 /*
150 * For ABB cut1.0 and 1.1 BAT_CTRL is internally
151 * connected to 1.8V through a 450k resistor
152 */
153 return (450000 * (v_batctrl)) / (1800 - v_batctrl);
154 }
155
156 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL) {
157 /*
158 * If the battery has internal NTC, we use the current
159 * source to calculate the resistance.
160 */
161 rbs = (v_batctrl * 1000
162 - di->bm->gnd_lift_resistance * inst_curr)
163 / di->curr_source;
164 } else {
165 /*
166 * BAT_CTRL is internally
167 * connected to 1.8V through a 80k resistor
168 */
169 rbs = (80000 * (v_batctrl)) / (1800 - v_batctrl);
170 }
171
172 return rbs;
173}
174
175/**
176 * ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage
177 * @di: pointer to the ab8500_btemp structure
178 *
179 * This function returns the voltage on BATCTRL. Returns value in mV.
180 */
181static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp *di)
182{
183 int vbtemp;
184 static int prev;
185
186 vbtemp = ab8500_gpadc_convert(di->gpadc, BAT_CTRL);
187 if (vbtemp < 0) {
188 dev_err(di->dev,
189 "%s gpadc conversion failed, using previous value",
190 __func__);
191 return prev;
192 }
193 prev = vbtemp;
194 return vbtemp;
195}
196
197/**
198 * ab8500_btemp_curr_source_enable() - enable/disable batctrl current source
199 * @di: pointer to the ab8500_btemp structure
200 * @enable: enable or disable the current source
201 *
202 * Enable or disable the current sources for the BatCtrl AD channel
203 */
204static int ab8500_btemp_curr_source_enable(struct ab8500_btemp *di,
205 bool enable)
206{
207 int curr;
208 int ret = 0;
209
210 /*
211 * BATCTRL current sources are included on AB8500 cut2.0
212 * and future versions
213 */
214 if (is_ab8500_1p1_or_earlier(di->parent))
215 return 0;
216
217 /* Only do this for batteries with internal NTC */
218 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && enable) {
219
220 if (is_ab8540(di->parent)) {
221 if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_60UA)
222 curr = BAT_CTRL_60U_ENA;
223 else
224 curr = BAT_CTRL_120U_ENA;
225 } else if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
226 if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_16UA)
227 curr = BAT_CTRL_16U_ENA;
228 else
229 curr = BAT_CTRL_18U_ENA;
230 } else {
231 if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_7UA)
232 curr = BAT_CTRL_7U_ENA;
233 else
234 curr = BAT_CTRL_20U_ENA;
235 }
236
237 dev_dbg(di->dev, "Set BATCTRL %duA\n", di->curr_source);
238
239 ret = abx500_mask_and_set_register_interruptible(di->dev,
240 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
241 FORCE_BAT_CTRL_CMP_HIGH, FORCE_BAT_CTRL_CMP_HIGH);
242 if (ret) {
243 dev_err(di->dev, "%s failed setting cmp_force\n",
244 __func__);
245 return ret;
246 }
247
248 /*
249 * We have to wait one 32kHz cycle before enabling
250 * the current source, since ForceBatCtrlCmpHigh needs
251 * to be written in a separate cycle
252 */
253 udelay(32);
254
255 ret = abx500_set_register_interruptible(di->dev,
256 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
257 FORCE_BAT_CTRL_CMP_HIGH | curr);
258 if (ret) {
259 dev_err(di->dev, "%s failed enabling current source\n",
260 __func__);
261 goto disable_curr_source;
262 }
263 } else if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && !enable) {
264 dev_dbg(di->dev, "Disable BATCTRL curr source\n");
265
266 if (is_ab8540(di->parent)) {
267 /* Write 0 to the curr bits */
268 ret = abx500_mask_and_set_register_interruptible(
269 di->dev,
270 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
271 BAT_CTRL_60U_ENA | BAT_CTRL_120U_ENA,
272 ~(BAT_CTRL_60U_ENA | BAT_CTRL_120U_ENA));
273 } else if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
274 /* Write 0 to the curr bits */
275 ret = abx500_mask_and_set_register_interruptible(
276 di->dev,
277 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
278 BAT_CTRL_16U_ENA | BAT_CTRL_18U_ENA,
279 ~(BAT_CTRL_16U_ENA | BAT_CTRL_18U_ENA));
280 } else {
281 /* Write 0 to the curr bits */
282 ret = abx500_mask_and_set_register_interruptible(
283 di->dev,
284 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
285 BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
286 ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
287 }
288
289 if (ret) {
290 dev_err(di->dev, "%s failed disabling current source\n",
291 __func__);
292 goto disable_curr_source;
293 }
294
295 /* Enable Pull-Up and comparator */
296 ret = abx500_mask_and_set_register_interruptible(di->dev,
297 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
298 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
299 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
300 if (ret) {
301 dev_err(di->dev, "%s failed enabling PU and comp\n",
302 __func__);
303 goto enable_pu_comp;
304 }
305
306 /*
307 * We have to wait one 32kHz cycle before disabling
308 * ForceBatCtrlCmpHigh since this needs to be written
309 * in a separate cycle
310 */
311 udelay(32);
312
313 /* Disable 'force comparator' */
314 ret = abx500_mask_and_set_register_interruptible(di->dev,
315 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
316 FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
317 if (ret) {
318 dev_err(di->dev, "%s failed disabling force comp\n",
319 __func__);
320 goto disable_force_comp;
321 }
322 }
323 return ret;
324
325 /*
326 * We have to try unsetting FORCE_BAT_CTRL_CMP_HIGH one more time
327 * if we got an error above
328 */
329disable_curr_source:
330 if (is_ab8540(di->parent)) {
331 /* Write 0 to the curr bits */
332 ret = abx500_mask_and_set_register_interruptible(di->dev,
333 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
334 BAT_CTRL_60U_ENA | BAT_CTRL_120U_ENA,
335 ~(BAT_CTRL_60U_ENA | BAT_CTRL_120U_ENA));
336 } else if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
337 /* Write 0 to the curr bits */
338 ret = abx500_mask_and_set_register_interruptible(di->dev,
339 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
340 BAT_CTRL_16U_ENA | BAT_CTRL_18U_ENA,
341 ~(BAT_CTRL_16U_ENA | BAT_CTRL_18U_ENA));
342 } else {
343 /* Write 0 to the curr bits */
344 ret = abx500_mask_and_set_register_interruptible(di->dev,
345 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
346 BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
347 ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
348 }
349
350 if (ret) {
351 dev_err(di->dev, "%s failed disabling current source\n",
352 __func__);
353 return ret;
354 }
355enable_pu_comp:
356 /* Enable Pull-Up and comparator */
357 ret = abx500_mask_and_set_register_interruptible(di->dev,
358 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
359 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
360 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
361 if (ret) {
362 dev_err(di->dev, "%s failed enabling PU and comp\n",
363 __func__);
364 return ret;
365 }
366
367disable_force_comp:
368 /*
369 * We have to wait one 32kHz cycle before disabling
370 * ForceBatCtrlCmpHigh since this needs to be written
371 * in a separate cycle
372 */
373 udelay(32);
374
375 /* Disable 'force comparator' */
376 ret = abx500_mask_and_set_register_interruptible(di->dev,
377 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
378 FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
379 if (ret) {
380 dev_err(di->dev, "%s failed disabling force comp\n",
381 __func__);
382 return ret;
383 }
384
385 return ret;
386}
387
388/**
389 * ab8500_btemp_get_batctrl_res() - get battery resistance
390 * @di: pointer to the ab8500_btemp structure
391 *
392 * This function returns the battery pack identification resistance.
393 * Returns value in Ohms.
394 */
395static int ab8500_btemp_get_batctrl_res(struct ab8500_btemp *di)
396{
397 int ret;
398 int batctrl = 0;
399 int res;
400 int inst_curr;
401 int i;
402
403 /*
404 * BATCTRL current sources are included on AB8500 cut2.0
405 * and future versions
406 */
407 ret = ab8500_btemp_curr_source_enable(di, true);
408 if (ret) {
409 dev_err(di->dev, "%s curr source enabled failed\n", __func__);
410 return ret;
411 }
412
413 if (!di->fg)
414 di->fg = ab8500_fg_get();
415 if (!di->fg) {
416 dev_err(di->dev, "No fg found\n");
417 return -EINVAL;
418 }
419
420 ret = ab8500_fg_inst_curr_start(di->fg);
421
422 if (ret) {
423 dev_err(di->dev, "Failed to start current measurement\n");
424 return ret;
425 }
426
427 do {
428 msleep(20);
429 } while (!ab8500_fg_inst_curr_started(di->fg));
430
431 i = 0;
432
433 do {
434 batctrl += ab8500_btemp_read_batctrl_voltage(di);
435 i++;
436 msleep(20);
437 } while (!ab8500_fg_inst_curr_done(di->fg));
438 batctrl /= i;
439
440 ret = ab8500_fg_inst_curr_finalize(di->fg, &inst_curr);
441 if (ret) {
442 dev_err(di->dev, "Failed to finalize current measurement\n");
443 return ret;
444 }
445
446 res = ab8500_btemp_batctrl_volt_to_res(di, batctrl, inst_curr);
447
448 ret = ab8500_btemp_curr_source_enable(di, false);
449 if (ret) {
450 dev_err(di->dev, "%s curr source disable failed\n", __func__);
451 return ret;
452 }
453
454 dev_dbg(di->dev, "%s batctrl: %d res: %d inst_curr: %d samples: %d\n",
455 __func__, batctrl, res, inst_curr, i);
456
457 return res;
458}
459
460/**
461 * ab8500_btemp_res_to_temp() - resistance to temperature
462 * @di: pointer to the ab8500_btemp structure
463 * @tbl: pointer to the resiatance to temperature table
464 * @tbl_size: size of the resistance to temperature table
465 * @res: resistance to calculate the temperature from
466 *
467 * This function returns the battery temperature in degrees Celcius
468 * based on the NTC resistance.
469 */
470static int ab8500_btemp_res_to_temp(struct ab8500_btemp *di,
471 const struct abx500_res_to_temp *tbl, int tbl_size, int res)
472{
473 int i, temp;
474 /*
475 * Calculate the formula for the straight line
476 * Simple interpolation if we are within
477 * the resistance table limits, extrapolate
478 * if resistance is outside the limits.
479 */
480 if (res > tbl[0].resist)
481 i = 0;
482 else if (res <= tbl[tbl_size - 1].resist)
483 i = tbl_size - 2;
484 else {
485 i = 0;
486 while (!(res <= tbl[i].resist &&
487 res > tbl[i + 1].resist))
488 i++;
489 }
490
491 temp = tbl[i].temp + ((tbl[i + 1].temp - tbl[i].temp) *
492 (res - tbl[i].resist)) / (tbl[i + 1].resist - tbl[i].resist);
493 return temp;
494}
495
496/**
497 * ab8500_btemp_measure_temp() - measure battery temperature
498 * @di: pointer to the ab8500_btemp structure
499 *
500 * Returns battery temperature (on success) else the previous temperature
501 */
502static int ab8500_btemp_measure_temp(struct ab8500_btemp *di)
503{
504 int temp;
505 static int prev;
506 int rbat, rntc, vntc;
507 u8 id;
508
509 id = di->bm->batt_id;
510
511 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL &&
512 id != BATTERY_UNKNOWN) {
513
514 rbat = ab8500_btemp_get_batctrl_res(di);
515 if (rbat < 0) {
516 dev_err(di->dev, "%s get batctrl res failed\n",
517 __func__);
518 /*
519 * Return out-of-range temperature so that
520 * charging is stopped
521 */
522 return BTEMP_THERMAL_LOW_LIMIT;
523 }
524
525 temp = ab8500_btemp_res_to_temp(di,
526 di->bm->bat_type[id].r_to_t_tbl,
527 di->bm->bat_type[id].n_temp_tbl_elements, rbat);
528 } else {
529 vntc = ab8500_gpadc_convert(di->gpadc, BTEMP_BALL);
530 if (vntc < 0) {
531 dev_err(di->dev,
532 "%s gpadc conversion failed,"
533 " using previous value\n", __func__);
534 return prev;
535 }
536 /*
537 * The PCB NTC is sourced from VTVOUT via a 230kOhm
538 * resistor.
539 */
540 rntc = 230000 * vntc / (VTVOUT_V - vntc);
541
542 temp = ab8500_btemp_res_to_temp(di,
543 di->bm->bat_type[id].r_to_t_tbl,
544 di->bm->bat_type[id].n_temp_tbl_elements, rntc);
545 prev = temp;
546 }
547 dev_dbg(di->dev, "Battery temperature is %d\n", temp);
548 return temp;
549}
550
551/**
552 * ab8500_btemp_id() - Identify the connected battery
553 * @di: pointer to the ab8500_btemp structure
554 *
555 * This function will try to identify the battery by reading the ID
556 * resistor. Some brands use a combined ID resistor with a NTC resistor to
557 * both be able to identify and to read the temperature of it.
558 */
559static int ab8500_btemp_id(struct ab8500_btemp *di)
560{
561 int res;
562 u8 i;
563 if (is_ab8540(di->parent))
564 di->curr_source = BTEMP_BATCTRL_CURR_SRC_60UA;
565 else if (is_ab9540(di->parent) || is_ab8505(di->parent))
566 di->curr_source = BTEMP_BATCTRL_CURR_SRC_16UA;
567 else
568 di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA;
569
570 di->bm->batt_id = BATTERY_UNKNOWN;
571
572 res = ab8500_btemp_get_batctrl_res(di);
573 if (res < 0) {
574 dev_err(di->dev, "%s get batctrl res failed\n", __func__);
575 return -ENXIO;
576 }
577
578 /* BATTERY_UNKNOWN is defined on position 0, skip it! */
579 for (i = BATTERY_UNKNOWN + 1; i < di->bm->n_btypes; i++) {
580 if ((res <= di->bm->bat_type[i].resis_high) &&
581 (res >= di->bm->bat_type[i].resis_low)) {
582 dev_dbg(di->dev, "Battery detected on %s"
583 " low %d < res %d < high: %d"
584 " index: %d\n",
585 di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL ?
586 "BATCTRL" : "BATTEMP",
587 di->bm->bat_type[i].resis_low, res,
588 di->bm->bat_type[i].resis_high, i);
589
590 di->bm->batt_id = i;
591 break;
592 }
593 }
594
595 if (di->bm->batt_id == BATTERY_UNKNOWN) {
596 dev_warn(di->dev, "Battery identified as unknown"
597 ", resistance %d Ohm\n", res);
598 return -ENXIO;
599 }
600
601 /*
602 * We only have to change current source if the
603 * detected type is Type 1.
604 */
605 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL &&
606 di->bm->batt_id == 1) {
607 if (is_ab8540(di->parent)) {
608 dev_dbg(di->dev,
609 "Set BATCTRL current source to 60uA\n");
610 di->curr_source = BTEMP_BATCTRL_CURR_SRC_60UA;
611 } else if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
612 dev_dbg(di->dev,
613 "Set BATCTRL current source to 16uA\n");
614 di->curr_source = BTEMP_BATCTRL_CURR_SRC_16UA;
615 } else {
616 dev_dbg(di->dev, "Set BATCTRL current source to 20uA\n");
617 di->curr_source = BTEMP_BATCTRL_CURR_SRC_20UA;
618 }
619 }
620
621 return di->bm->batt_id;
622}
623
624/**
625 * ab8500_btemp_periodic_work() - Measuring the temperature periodically
626 * @work: pointer to the work_struct structure
627 *
628 * Work function for measuring the temperature periodically
629 */
630static void ab8500_btemp_periodic_work(struct work_struct *work)
631{
632 int interval;
633 int bat_temp;
634 struct ab8500_btemp *di = container_of(work,
635 struct ab8500_btemp, btemp_periodic_work.work);
636
637 if (!di->initialized) {
638 /* Identify the battery */
639 if (ab8500_btemp_id(di) < 0)
640 dev_warn(di->dev, "failed to identify the battery\n");
641 }
642
643 bat_temp = ab8500_btemp_measure_temp(di);
644 /*
645 * Filter battery temperature.
646 * Allow direct updates on temperature only if two samples result in
647 * same temperature. Else only allow 1 degree change from previous
648 * reported value in the direction of the new measurement.
649 */
650 if ((bat_temp == di->prev_bat_temp) || !di->initialized) {
651 if ((di->bat_temp != di->prev_bat_temp) || !di->initialized) {
652 di->initialized = true;
653 di->bat_temp = bat_temp;
654 power_supply_changed(di->btemp_psy);
655 }
656 } else if (bat_temp < di->prev_bat_temp) {
657 di->bat_temp--;
658 power_supply_changed(di->btemp_psy);
659 } else if (bat_temp > di->prev_bat_temp) {
660 di->bat_temp++;
661 power_supply_changed(di->btemp_psy);
662 }
663 di->prev_bat_temp = bat_temp;
664
665 if (di->events.ac_conn || di->events.usb_conn)
666 interval = di->bm->temp_interval_chg;
667 else
668 interval = di->bm->temp_interval_nochg;
669
670 /* Schedule a new measurement */
671 queue_delayed_work(di->btemp_wq,
672 &di->btemp_periodic_work,
673 round_jiffies(interval * HZ));
674}
675
676/**
677 * ab8500_btemp_batctrlindb_handler() - battery removal detected
678 * @irq: interrupt number
679 * @_di: void pointer that has to address of ab8500_btemp
680 *
681 * Returns IRQ status(IRQ_HANDLED)
682 */
683static irqreturn_t ab8500_btemp_batctrlindb_handler(int irq, void *_di)
684{
685 struct ab8500_btemp *di = _di;
686 dev_err(di->dev, "Battery removal detected!\n");
687
688 di->events.batt_rem = true;
689 power_supply_changed(di->btemp_psy);
690
691 return IRQ_HANDLED;
692}
693
694/**
695 * ab8500_btemp_templow_handler() - battery temp lower than 10 degrees
696 * @irq: interrupt number
697 * @_di: void pointer that has to address of ab8500_btemp
698 *
699 * Returns IRQ status(IRQ_HANDLED)
700 */
701static irqreturn_t ab8500_btemp_templow_handler(int irq, void *_di)
702{
703 struct ab8500_btemp *di = _di;
704
705 if (is_ab8500_3p3_or_earlier(di->parent)) {
706 dev_dbg(di->dev, "Ignore false btemp low irq"
707 " for ABB cut 1.0, 1.1, 2.0 and 3.3\n");
708 } else {
709 dev_crit(di->dev, "Battery temperature lower than -10deg c\n");
710
711 di->events.btemp_low = true;
712 di->events.btemp_high = false;
713 di->events.btemp_medhigh = false;
714 di->events.btemp_lowmed = false;
715 power_supply_changed(di->btemp_psy);
716 }
717
718 return IRQ_HANDLED;
719}
720
721/**
722 * ab8500_btemp_temphigh_handler() - battery temp higher than max temp
723 * @irq: interrupt number
724 * @_di: void pointer that has to address of ab8500_btemp
725 *
726 * Returns IRQ status(IRQ_HANDLED)
727 */
728static irqreturn_t ab8500_btemp_temphigh_handler(int irq, void *_di)
729{
730 struct ab8500_btemp *di = _di;
731
732 dev_crit(di->dev, "Battery temperature is higher than MAX temp\n");
733
734 di->events.btemp_high = true;
735 di->events.btemp_medhigh = false;
736 di->events.btemp_lowmed = false;
737 di->events.btemp_low = false;
738 power_supply_changed(di->btemp_psy);
739
740 return IRQ_HANDLED;
741}
742
743/**
744 * ab8500_btemp_lowmed_handler() - battery temp between low and medium
745 * @irq: interrupt number
746 * @_di: void pointer that has to address of ab8500_btemp
747 *
748 * Returns IRQ status(IRQ_HANDLED)
749 */
750static irqreturn_t ab8500_btemp_lowmed_handler(int irq, void *_di)
751{
752 struct ab8500_btemp *di = _di;
753
754 dev_dbg(di->dev, "Battery temperature is between low and medium\n");
755
756 di->events.btemp_lowmed = true;
757 di->events.btemp_medhigh = false;
758 di->events.btemp_high = false;
759 di->events.btemp_low = false;
760 power_supply_changed(di->btemp_psy);
761
762 return IRQ_HANDLED;
763}
764
765/**
766 * ab8500_btemp_medhigh_handler() - battery temp between medium and high
767 * @irq: interrupt number
768 * @_di: void pointer that has to address of ab8500_btemp
769 *
770 * Returns IRQ status(IRQ_HANDLED)
771 */
772static irqreturn_t ab8500_btemp_medhigh_handler(int irq, void *_di)
773{
774 struct ab8500_btemp *di = _di;
775
776 dev_dbg(di->dev, "Battery temperature is between medium and high\n");
777
778 di->events.btemp_medhigh = true;
779 di->events.btemp_lowmed = false;
780 di->events.btemp_high = false;
781 di->events.btemp_low = false;
782 power_supply_changed(di->btemp_psy);
783
784 return IRQ_HANDLED;
785}
786
787/**
788 * ab8500_btemp_periodic() - Periodic temperature measurements
789 * @di: pointer to the ab8500_btemp structure
790 * @enable: enable or disable periodic temperature measurements
791 *
792 * Starts of stops periodic temperature measurements. Periodic measurements
793 * should only be done when a charger is connected.
794 */
795static void ab8500_btemp_periodic(struct ab8500_btemp *di,
796 bool enable)
797{
798 dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n",
799 enable);
800 /*
801 * Make sure a new measurement is done directly by cancelling
802 * any pending work
803 */
804 cancel_delayed_work_sync(&di->btemp_periodic_work);
805
806 if (enable)
807 queue_delayed_work(di->btemp_wq, &di->btemp_periodic_work, 0);
808}
809
810/**
811 * ab8500_btemp_get_temp() - get battery temperature
812 * @di: pointer to the ab8500_btemp structure
813 *
814 * Returns battery temperature
815 */
816int ab8500_btemp_get_temp(struct ab8500_btemp *di)
817{
818 int temp = 0;
819
820 /*
821 * The BTEMP events are not reliabe on AB8500 cut3.3
822 * and prior versions
823 */
824 if (is_ab8500_3p3_or_earlier(di->parent)) {
825 temp = di->bat_temp * 10;
826 } else {
827 if (di->events.btemp_low) {
828 if (temp > di->btemp_ranges.btemp_low_limit)
829 temp = di->btemp_ranges.btemp_low_limit * 10;
830 else
831 temp = di->bat_temp * 10;
832 } else if (di->events.btemp_high) {
833 if (temp < di->btemp_ranges.btemp_high_limit)
834 temp = di->btemp_ranges.btemp_high_limit * 10;
835 else
836 temp = di->bat_temp * 10;
837 } else if (di->events.btemp_lowmed) {
838 if (temp > di->btemp_ranges.btemp_med_limit)
839 temp = di->btemp_ranges.btemp_med_limit * 10;
840 else
841 temp = di->bat_temp * 10;
842 } else if (di->events.btemp_medhigh) {
843 if (temp < di->btemp_ranges.btemp_med_limit)
844 temp = di->btemp_ranges.btemp_med_limit * 10;
845 else
846 temp = di->bat_temp * 10;
847 } else
848 temp = di->bat_temp * 10;
849 }
850 return temp;
851}
852EXPORT_SYMBOL(ab8500_btemp_get_temp);
853
854/**
855 * ab8500_btemp_get_batctrl_temp() - get the temperature
856 * @btemp: pointer to the btemp structure
857 *
858 * Returns the batctrl temperature in millidegrees
859 */
860int ab8500_btemp_get_batctrl_temp(struct ab8500_btemp *btemp)
861{
862 return btemp->bat_temp * 1000;
863}
864EXPORT_SYMBOL(ab8500_btemp_get_batctrl_temp);
865
866/**
867 * ab8500_btemp_get_property() - get the btemp properties
868 * @psy: pointer to the power_supply structure
869 * @psp: pointer to the power_supply_property structure
870 * @val: pointer to the power_supply_propval union
871 *
872 * This function gets called when an application tries to get the btemp
873 * properties by reading the sysfs files.
874 * online: presence of the battery
875 * present: presence of the battery
876 * technology: battery technology
877 * temp: battery temperature
878 * Returns error code in case of failure else 0(on success)
879 */
880static int ab8500_btemp_get_property(struct power_supply *psy,
881 enum power_supply_property psp,
882 union power_supply_propval *val)
883{
884 struct ab8500_btemp *di = power_supply_get_drvdata(psy);
885
886 switch (psp) {
887 case POWER_SUPPLY_PROP_PRESENT:
888 case POWER_SUPPLY_PROP_ONLINE:
889 if (di->events.batt_rem)
890 val->intval = 0;
891 else
892 val->intval = 1;
893 break;
894 case POWER_SUPPLY_PROP_TECHNOLOGY:
895 val->intval = di->bm->bat_type[di->bm->batt_id].name;
896 break;
897 case POWER_SUPPLY_PROP_TEMP:
898 val->intval = ab8500_btemp_get_temp(di);
899 break;
900 default:
901 return -EINVAL;
902 }
903 return 0;
904}
905
906static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data)
907{
908 struct power_supply *psy;
909 struct power_supply *ext = dev_get_drvdata(dev);
910 const char **supplicants = (const char **)ext->supplied_to;
911 struct ab8500_btemp *di;
912 union power_supply_propval ret;
913 int j;
914
915 psy = (struct power_supply *)data;
916 di = power_supply_get_drvdata(psy);
917
918 /*
919 * For all psy where the name of your driver
920 * appears in any supplied_to
921 */
922 j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
923 if (j < 0)
924 return 0;
925
926 /* Go through all properties for the psy */
927 for (j = 0; j < ext->desc->num_properties; j++) {
928 enum power_supply_property prop;
929 prop = ext->desc->properties[j];
930
931 if (power_supply_get_property(ext, prop, &ret))
932 continue;
933
934 switch (prop) {
935 case POWER_SUPPLY_PROP_PRESENT:
936 switch (ext->desc->type) {
937 case POWER_SUPPLY_TYPE_MAINS:
938 /* AC disconnected */
939 if (!ret.intval && di->events.ac_conn) {
940 di->events.ac_conn = false;
941 }
942 /* AC connected */
943 else if (ret.intval && !di->events.ac_conn) {
944 di->events.ac_conn = true;
945 if (!di->events.usb_conn)
946 ab8500_btemp_periodic(di, true);
947 }
948 break;
949 case POWER_SUPPLY_TYPE_USB:
950 /* USB disconnected */
951 if (!ret.intval && di->events.usb_conn) {
952 di->events.usb_conn = false;
953 }
954 /* USB connected */
955 else if (ret.intval && !di->events.usb_conn) {
956 di->events.usb_conn = true;
957 if (!di->events.ac_conn)
958 ab8500_btemp_periodic(di, true);
959 }
960 break;
961 default:
962 break;
963 }
964 break;
965 default:
966 break;
967 }
968 }
969 return 0;
970}
971
972/**
973 * ab8500_btemp_external_power_changed() - callback for power supply changes
974 * @psy: pointer to the structure power_supply
975 *
976 * This function is pointing to the function pointer external_power_changed
977 * of the structure power_supply.
978 * This function gets executed when there is a change in the external power
979 * supply to the btemp.
980 */
981static void ab8500_btemp_external_power_changed(struct power_supply *psy)
982{
983 struct ab8500_btemp *di = power_supply_get_drvdata(psy);
984
985 class_for_each_device(power_supply_class, NULL,
986 di->btemp_psy, ab8500_btemp_get_ext_psy_data);
987}
988
989/* ab8500 btemp driver interrupts and their respective isr */
990static struct ab8500_btemp_interrupts ab8500_btemp_irq[] = {
991 {"BAT_CTRL_INDB", ab8500_btemp_batctrlindb_handler},
992 {"BTEMP_LOW", ab8500_btemp_templow_handler},
993 {"BTEMP_HIGH", ab8500_btemp_temphigh_handler},
994 {"BTEMP_LOW_MEDIUM", ab8500_btemp_lowmed_handler},
995 {"BTEMP_MEDIUM_HIGH", ab8500_btemp_medhigh_handler},
996};
997
998#if defined(CONFIG_PM)
999static int ab8500_btemp_resume(struct platform_device *pdev)
1000{
1001 struct ab8500_btemp *di = platform_get_drvdata(pdev);
1002
1003 ab8500_btemp_periodic(di, true);
1004
1005 return 0;
1006}
1007
1008static int ab8500_btemp_suspend(struct platform_device *pdev,
1009 pm_message_t state)
1010{
1011 struct ab8500_btemp *di = platform_get_drvdata(pdev);
1012
1013 ab8500_btemp_periodic(di, false);
1014
1015 return 0;
1016}
1017#else
1018#define ab8500_btemp_suspend NULL
1019#define ab8500_btemp_resume NULL
1020#endif
1021
1022static int ab8500_btemp_remove(struct platform_device *pdev)
1023{
1024 struct ab8500_btemp *di = platform_get_drvdata(pdev);
1025 int i, irq;
1026
1027 /* Disable interrupts */
1028 for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
1029 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1030 free_irq(irq, di);
1031 }
1032
1033 /* Delete the work queue */
1034 destroy_workqueue(di->btemp_wq);
1035
1036 flush_scheduled_work();
1037 power_supply_unregister(di->btemp_psy);
1038
1039 return 0;
1040}
1041
1042static char *supply_interface[] = {
1043 "ab8500_chargalg",
1044 "ab8500_fg",
1045};
1046
1047static const struct power_supply_desc ab8500_btemp_desc = {
1048 .name = "ab8500_btemp",
1049 .type = POWER_SUPPLY_TYPE_BATTERY,
1050 .properties = ab8500_btemp_props,
1051 .num_properties = ARRAY_SIZE(ab8500_btemp_props),
1052 .get_property = ab8500_btemp_get_property,
1053 .external_power_changed = ab8500_btemp_external_power_changed,
1054};
1055
1056static int ab8500_btemp_probe(struct platform_device *pdev)
1057{
1058 struct device_node *np = pdev->dev.of_node;
1059 struct abx500_bm_data *plat = pdev->dev.platform_data;
1060 struct power_supply_config psy_cfg = {};
1061 struct ab8500_btemp *di;
1062 int irq, i, ret = 0;
1063 u8 val;
1064
1065 di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1066 if (!di) {
1067 dev_err(&pdev->dev, "%s no mem for ab8500_btemp\n", __func__);
1068 return -ENOMEM;
1069 }
1070
1071 if (!plat) {
1072 dev_err(&pdev->dev, "no battery management data supplied\n");
1073 return -EINVAL;
1074 }
1075 di->bm = plat;
1076
1077 if (np) {
1078 ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
1079 if (ret) {
1080 dev_err(&pdev->dev, "failed to get battery information\n");
1081 return ret;
1082 }
1083 }
1084
1085 /* get parent data */
1086 di->dev = &pdev->dev;
1087 di->parent = dev_get_drvdata(pdev->dev.parent);
1088 di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
1089
1090 di->initialized = false;
1091
1092 psy_cfg.supplied_to = supply_interface;
1093 psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
1094 psy_cfg.drv_data = di;
1095
1096 /* Create a work queue for the btemp */
1097 di->btemp_wq =
1098 alloc_workqueue("ab8500_btemp_wq", WQ_MEM_RECLAIM, 0);
1099 if (di->btemp_wq == NULL) {
1100 dev_err(di->dev, "failed to create work queue\n");
1101 return -ENOMEM;
1102 }
1103
1104 /* Init work for measuring temperature periodically */
1105 INIT_DEFERRABLE_WORK(&di->btemp_periodic_work,
1106 ab8500_btemp_periodic_work);
1107
1108 /* Set BTEMP thermal limits. Low and Med are fixed */
1109 di->btemp_ranges.btemp_low_limit = BTEMP_THERMAL_LOW_LIMIT;
1110 di->btemp_ranges.btemp_med_limit = BTEMP_THERMAL_MED_LIMIT;
1111
1112 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1113 AB8500_BTEMP_HIGH_TH, &val);
1114 if (ret < 0) {
1115 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1116 goto free_btemp_wq;
1117 }
1118 switch (val) {
1119 case BTEMP_HIGH_TH_57_0:
1120 case BTEMP_HIGH_TH_57_1:
1121 di->btemp_ranges.btemp_high_limit =
1122 BTEMP_THERMAL_HIGH_LIMIT_57;
1123 break;
1124 case BTEMP_HIGH_TH_52:
1125 di->btemp_ranges.btemp_high_limit =
1126 BTEMP_THERMAL_HIGH_LIMIT_52;
1127 break;
1128 case BTEMP_HIGH_TH_62:
1129 di->btemp_ranges.btemp_high_limit =
1130 BTEMP_THERMAL_HIGH_LIMIT_62;
1131 break;
1132 }
1133
1134 /* Register BTEMP power supply class */
1135 di->btemp_psy = power_supply_register(di->dev, &ab8500_btemp_desc,
1136 &psy_cfg);
1137 if (IS_ERR(di->btemp_psy)) {
1138 dev_err(di->dev, "failed to register BTEMP psy\n");
1139 ret = PTR_ERR(di->btemp_psy);
1140 goto free_btemp_wq;
1141 }
1142
1143 /* Register interrupts */
1144 for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
1145 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1146 ret = request_threaded_irq(irq, NULL, ab8500_btemp_irq[i].isr,
1147 IRQF_SHARED | IRQF_NO_SUSPEND,
1148 ab8500_btemp_irq[i].name, di);
1149
1150 if (ret) {
1151 dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
1152 , ab8500_btemp_irq[i].name, irq, ret);
1153 goto free_irq;
1154 }
1155 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
1156 ab8500_btemp_irq[i].name, irq, ret);
1157 }
1158
1159 platform_set_drvdata(pdev, di);
1160
1161 /* Kick off periodic temperature measurements */
1162 ab8500_btemp_periodic(di, true);
1163 list_add_tail(&di->node, &ab8500_btemp_list);
1164
1165 return ret;
1166
1167free_irq:
1168 power_supply_unregister(di->btemp_psy);
1169
1170 /* We also have to free all successfully registered irqs */
1171 for (i = i - 1; i >= 0; i--) {
1172 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1173 free_irq(irq, di);
1174 }
1175free_btemp_wq:
1176 destroy_workqueue(di->btemp_wq);
1177 return ret;
1178}
1179
1180static const struct of_device_id ab8500_btemp_match[] = {
1181 { .compatible = "stericsson,ab8500-btemp", },
1182 { },
1183};
1184
1185static struct platform_driver ab8500_btemp_driver = {
1186 .probe = ab8500_btemp_probe,
1187 .remove = ab8500_btemp_remove,
1188 .suspend = ab8500_btemp_suspend,
1189 .resume = ab8500_btemp_resume,
1190 .driver = {
1191 .name = "ab8500-btemp",
1192 .of_match_table = ab8500_btemp_match,
1193 },
1194};
1195
1196static int __init ab8500_btemp_init(void)
1197{
1198 return platform_driver_register(&ab8500_btemp_driver);
1199}
1200
1201static void __exit ab8500_btemp_exit(void)
1202{
1203 platform_driver_unregister(&ab8500_btemp_driver);
1204}
1205
1206device_initcall(ab8500_btemp_init);
1207module_exit(ab8500_btemp_exit);
1208
1209MODULE_LICENSE("GPL v2");
1210MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
1211MODULE_ALIAS("platform:ab8500-btemp");
1212MODULE_DESCRIPTION("AB8500 battery temperature driver");
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-11 06:32:36 -0500