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ab8500_fg: Round capacity output
[linux-2.6-block.git] / drivers / power / ab8500_btemp.c
CommitLineData
1f855824
AM		 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>
bd9e8ab2
R		 23#include <linux/jiffies.h>
24#include <linux/of.h>
25#include <linux/mfd/core.h>
1f855824 26#include <linux/mfd/abx500.h>
bd9e8ab2 27#include <linux/mfd/abx500/ab8500.h>
1f855824
AM		 28#include <linux/mfd/abx500/ab8500-bm.h>
29#include <linux/mfd/abx500/ab8500-gpadc.h>
1f855824
AM		 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 to_ab8500_btemp_device_info(x) container_of((x), \
43 struct ab8500_btemp, btemp_psy);
44
45/**
46 * struct ab8500_btemp_interrupts - ab8500 interrupts
47 * @name: name of the interrupt
48 * @isr function pointer to the isr
49 */
50struct ab8500_btemp_interrupts {
51 char *name;
52 irqreturn_t (*isr)(int irq, void *data);
53};
54
55struct ab8500_btemp_events {
56 bool batt_rem;
57 bool btemp_high;
58 bool btemp_medhigh;
59 bool btemp_lowmed;
60 bool btemp_low;
61 bool ac_conn;
62 bool usb_conn;
63};
64
65struct ab8500_btemp_ranges {
66 int btemp_high_limit;
67 int btemp_med_limit;
68 int btemp_low_limit;
69};
70
71/**
72 * struct ab8500_btemp - ab8500 BTEMP device information
73 * @dev: Pointer to the structure device
74 * @node: List of AB8500 BTEMPs, hence prepared for reentrance
75 * @curr_source: What current source we use, in uA
76 * @bat_temp: Battery temperature in degree Celcius
77 * @prev_bat_temp Last dispatched battery temperature
78 * @parent: Pointer to the struct ab8500
79 * @gpadc: Pointer to the struct gpadc
80 * @fg: Pointer to the struct fg
b0284de0 81 * @bm: Platform specific battery management information
1f855824
AM		 82 * @btemp_psy: Structure for BTEMP specific battery properties
83 * @events: Structure for information about events triggered
84 * @btemp_ranges: Battery temperature range structure
85 * @btemp_wq: Work queue for measuring the temperature periodically
86 * @btemp_periodic_work: Work for measuring the temperature periodically
f6271b4f 87 * @initialized: True if battery id read.
1f855824
AM		 88 */
89struct ab8500_btemp {
90 struct device *dev;
91 struct list_head node;
92 int curr_source;
93 int bat_temp;
94 int prev_bat_temp;
95 struct ab8500 *parent;
96 struct ab8500_gpadc *gpadc;
97 struct ab8500_fg *fg;
b0284de0 98 struct abx500_bm_data *bm;
1f855824
AM		 99 struct power_supply btemp_psy;
100 struct ab8500_btemp_events events;
101 struct ab8500_btemp_ranges btemp_ranges;
102 struct workqueue_struct *btemp_wq;
103 struct delayed_work btemp_periodic_work;
f6271b4f 104 bool initialized;
1f855824
AM		 105};
106
107/* BTEMP power supply properties */
108static enum power_supply_property ab8500_btemp_props[] = {
109 POWER_SUPPLY_PROP_PRESENT,
110 POWER_SUPPLY_PROP_ONLINE,
111 POWER_SUPPLY_PROP_TECHNOLOGY,
112 POWER_SUPPLY_PROP_TEMP,
113};
114
115static LIST_HEAD(ab8500_btemp_list);
116
117/**
118 * ab8500_btemp_get() - returns a reference to the primary AB8500 BTEMP
119 * (i.e. the first BTEMP in the instance list)
120 */
121struct ab8500_btemp *ab8500_btemp_get(void)
122{
123 struct ab8500_btemp *btemp;
124 btemp = list_first_entry(&ab8500_btemp_list, struct ab8500_btemp, node);
125
126 return btemp;
127}
128
129/**
130 * ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance
131 * @di: pointer to the ab8500_btemp structure
132 * @v_batctrl: measured batctrl voltage
133 * @inst_curr: measured instant current
134 *
135 * This function returns the battery resistance that is
136 * derived from the BATCTRL voltage.
137 * Returns value in Ohms.
138 */
139static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di,
140 int v_batctrl, int inst_curr)
141{
142 int rbs;
143
144 if (is_ab8500_1p1_or_earlier(di->parent)) {
145 /*
146 * For ABB cut1.0 and 1.1 BAT_CTRL is internally
147 * connected to 1.8V through a 450k resistor
148 */
149 return (450000 * (v_batctrl)) / (1800 - v_batctrl);
150 }
151
b0284de0 152 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL) {
1f855824
AM		 153 /*
154 * If the battery has internal NTC, we use the current
155 * source to calculate the resistance, 7uA or 20uA
156 */
157 rbs = (v_batctrl * 1000
b0284de0 158 - di->bm->gnd_lift_resistance * inst_curr)
1f855824
AM		 159 / di->curr_source;
160 } else {
161 /*
162 * BAT_CTRL is internally
163 * connected to 1.8V through a 80k resistor
164 */
165 rbs = (80000 * (v_batctrl)) / (1800 - v_batctrl);
166 }
167
168 return rbs;
169}
170
171/**
172 * ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage
173 * @di: pointer to the ab8500_btemp structure
174 *
175 * This function returns the voltage on BATCTRL. Returns value in mV.
176 */
177static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp *di)
178{
179 int vbtemp;
180 static int prev;
181
182 vbtemp = ab8500_gpadc_convert(di->gpadc, BAT_CTRL);
183 if (vbtemp < 0) {
184 dev_err(di->dev,
185 "%s gpadc conversion failed, using previous value",
186 __func__);
187 return prev;
188 }
189 prev = vbtemp;
190 return vbtemp;
191}
192
193/**
194 * ab8500_btemp_curr_source_enable() - enable/disable batctrl current source
195 * @di: pointer to the ab8500_btemp structure
196 * @enable: enable or disable the current source
197 *
198 * Enable or disable the current sources for the BatCtrl AD channel
199 */
200static int ab8500_btemp_curr_source_enable(struct ab8500_btemp *di,
201 bool enable)
202{
203 int curr;
204 int ret = 0;
205
206 /*
207 * BATCTRL current sources are included on AB8500 cut2.0
208 * and future versions
209 */
210 if (is_ab8500_1p1_or_earlier(di->parent))
211 return 0;
212
213 /* Only do this for batteries with internal NTC */
b0284de0 214 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && enable) {
1f855824
AM		 215 if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_7UA)
216 curr = BAT_CTRL_7U_ENA;
217 else
218 curr = BAT_CTRL_20U_ENA;
219
220 dev_dbg(di->dev, "Set BATCTRL %duA\n", di->curr_source);
221
222 ret = abx500_mask_and_set_register_interruptible(di->dev,
223 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
224 FORCE_BAT_CTRL_CMP_HIGH, FORCE_BAT_CTRL_CMP_HIGH);
225 if (ret) {
226 dev_err(di->dev, "%s failed setting cmp_force\n",
227 __func__);
228 return ret;
229 }
230
231 /*
232 * We have to wait one 32kHz cycle before enabling
233 * the current source, since ForceBatCtrlCmpHigh needs
234 * to be written in a separate cycle
235 */
236 udelay(32);
237
238 ret = abx500_set_register_interruptible(di->dev,
239 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
240 FORCE_BAT_CTRL_CMP_HIGH | curr);
241 if (ret) {
242 dev_err(di->dev, "%s failed enabling current source\n",
243 __func__);
244 goto disable_curr_source;
245 }
b0284de0 246 } else if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && !enable) {
1f855824
AM		 247 dev_dbg(di->dev, "Disable BATCTRL curr source\n");
248
249 /* Write 0 to the curr bits */
250 ret = abx500_mask_and_set_register_interruptible(di->dev,
251 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
252 BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
253 ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
254 if (ret) {
255 dev_err(di->dev, "%s failed disabling current source\n",
256 __func__);
257 goto disable_curr_source;
258 }
259
260 /* Enable Pull-Up and comparator */
261 ret = abx500_mask_and_set_register_interruptible(di->dev,
262 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
263 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
264 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
265 if (ret) {
266 dev_err(di->dev, "%s failed enabling PU and comp\n",
267 __func__);
268 goto enable_pu_comp;
269 }
270
271 /*
272 * We have to wait one 32kHz cycle before disabling
273 * ForceBatCtrlCmpHigh since this needs to be written
274 * in a separate cycle
275 */
276 udelay(32);
277
278 /* Disable 'force comparator' */
279 ret = abx500_mask_and_set_register_interruptible(di->dev,
280 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
281 FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
282 if (ret) {
283 dev_err(di->dev, "%s failed disabling force comp\n",
284 __func__);
285 goto disable_force_comp;
286 }
287 }
288 return ret;
289
290 /*
291 * We have to try unsetting FORCE_BAT_CTRL_CMP_HIGH one more time
292 * if we got an error above
293 */
294disable_curr_source:
295 /* Write 0 to the curr bits */
296 ret = abx500_mask_and_set_register_interruptible(di->dev,
297 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
298 BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
299 ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
300 if (ret) {
301 dev_err(di->dev, "%s failed disabling current source\n",
302 __func__);
303 return ret;
304 }
305enable_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
317disable_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 */
345static 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
3988a4df
JB		 377 do {
378 msleep(20);
379 } while (!ab8500_fg_inst_curr_started(di->fg));
380
1f855824
AM		 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 Celcius
418 * based on the NTC resistance.
419 */
420static int ab8500_btemp_res_to_temp(struct ab8500_btemp *di,
421 const struct abx500_res_to_temp *tbl, int tbl_size, int res)
422{
423 int i, temp;
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 temp = tbl[i].temp + ((tbl[i + 1].temp - tbl[i].temp) *
442 (res - tbl[i].resist)) / (tbl[i + 1].resist - tbl[i].resist);
443 return temp;
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 */
452static int ab8500_btemp_measure_temp(struct ab8500_btemp *di)
453{
454 int temp;
455 static int prev;
456 int rbat, rntc, vntc;
457 u8 id;
458
b0284de0 459 id = di->bm->batt_id;
1f855824 460
b0284de0 461 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL &&
1f855824
AM		 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,
b0284de0
LJ		 476 di->bm->bat_type[id].r_to_t_tbl,
477 di->bm->bat_type[id].n_temp_tbl_elements, rbat);
1f855824
AM		 478 } else {
479 vntc = ab8500_gpadc_convert(di->gpadc, BTEMP_BALL);
480 if (vntc < 0) {
481 dev_err(di->dev,
482 "%s gpadc 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,
b0284de0
LJ		 493 di->bm->bat_type[id].r_to_t_tbl,
494 di->bm->bat_type[id].n_temp_tbl_elements, rntc);
1f855824
AM		 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 */
509static 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;
b0284de0 515 di->bm->batt_id = BATTERY_UNKNOWN;
1f855824
AM		 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! */
b0284de0
LJ		 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)) {
1f855824
AM		 527 dev_dbg(di->dev, "Battery detected on %s"
528 " low %d < res %d < high: %d"
529 " index: %d\n",
b0284de0 530 di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL ?
1f855824 531 "BATCTRL" : "BATTEMP",
b0284de0
LJ		 532 di->bm->bat_type[i].resis_low, res,
533 di->bm->bat_type[i].resis_high, i);
1f855824 534
b0284de0 535 di->bm->batt_id = i;
1f855824
AM		 536 break;
537 }
538 }
539
b0284de0 540 if (di->bm->batt_id == BATTERY_UNKNOWN) {
1f855824
AM		 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, else we use the 7uA source
549 */
b0284de0
LJ		 550 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL &&
551 di->bm->batt_id == 1) {
1f855824
AM		 552 dev_dbg(di->dev, "Set BATCTRL current source to 20uA\n");
553 di->curr_source = BTEMP_BATCTRL_CURR_SRC_20UA;
554 }
555
b0284de0 556 return di->bm->batt_id;
1f855824
AM		 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 */
565static void ab8500_btemp_periodic_work(struct work_struct *work)
566{
567 int interval;
568 struct ab8500_btemp *di = container_of(work,
569 struct ab8500_btemp, btemp_periodic_work.work);
570
f6271b4f
JA		 571 if (!di->initialized) {
572 di->initialized = true;
573 /* Identify the battery */
574 if (ab8500_btemp_id(di) < 0)
575 dev_warn(di->dev, "failed to identify the battery\n");
576 }
577
1f855824
AM		 578 di->bat_temp = ab8500_btemp_measure_temp(di);
579
580 if (di->bat_temp != di->prev_bat_temp) {
581 di->prev_bat_temp = di->bat_temp;
582 power_supply_changed(&di->btemp_psy);
583 }
584
585 if (di->events.ac_conn || di->events.usb_conn)
b0284de0 586 interval = di->bm->temp_interval_chg;
1f855824 587 else
b0284de0 588 interval = di->bm->temp_interval_nochg;
1f855824
AM		 589
590 /* Schedule a new measurement */
591 queue_delayed_work(di->btemp_wq,
592 &di->btemp_periodic_work,
593 round_jiffies(interval * HZ));
594}
595
596/**
597 * ab8500_btemp_batctrlindb_handler() - battery removal detected
598 * @irq: interrupt number
599 * @_di: void pointer that has to address of ab8500_btemp
600 *
601 * Returns IRQ status(IRQ_HANDLED)
602 */
603static irqreturn_t ab8500_btemp_batctrlindb_handler(int irq, void *_di)
604{
605 struct ab8500_btemp *di = _di;
606 dev_err(di->dev, "Battery removal detected!\n");
607
608 di->events.batt_rem = true;
609 power_supply_changed(&di->btemp_psy);
610
611 return IRQ_HANDLED;
612}
613
614/**
615 * ab8500_btemp_templow_handler() - battery temp lower than 10 degrees
616 * @irq: interrupt number
617 * @_di: void pointer that has to address of ab8500_btemp
618 *
619 * Returns IRQ status(IRQ_HANDLED)
620 */
621static irqreturn_t ab8500_btemp_templow_handler(int irq, void *_di)
622{
623 struct ab8500_btemp *di = _di;
624
d36e3e6d 625 if (is_ab8500_3p3_or_earlier(di->parent)) {
1f855824 626 dev_dbg(di->dev, "Ignore false btemp low irq"
d36e3e6d 627 " for ABB cut 1.0, 1.1, 2.0 and 3.3\n");
1f855824
AM		 628 } else {
629 dev_crit(di->dev, "Battery temperature lower than -10deg c\n");
630
631 di->events.btemp_low = true;
632 di->events.btemp_high = false;
633 di->events.btemp_medhigh = false;
634 di->events.btemp_lowmed = false;
635 power_supply_changed(&di->btemp_psy);
636 }
637
638 return IRQ_HANDLED;
639}
640
641/**
642 * ab8500_btemp_temphigh_handler() - battery temp higher than max temp
643 * @irq: interrupt number
644 * @_di: void pointer that has to address of ab8500_btemp
645 *
646 * Returns IRQ status(IRQ_HANDLED)
647 */
648static irqreturn_t ab8500_btemp_temphigh_handler(int irq, void *_di)
649{
650 struct ab8500_btemp *di = _di;
651
652 dev_crit(di->dev, "Battery temperature is higher than MAX temp\n");
653
654 di->events.btemp_high = true;
655 di->events.btemp_medhigh = false;
656 di->events.btemp_lowmed = false;
657 di->events.btemp_low = false;
658 power_supply_changed(&di->btemp_psy);
659
660 return IRQ_HANDLED;
661}
662
663/**
664 * ab8500_btemp_lowmed_handler() - battery temp between low and medium
665 * @irq: interrupt number
666 * @_di: void pointer that has to address of ab8500_btemp
667 *
668 * Returns IRQ status(IRQ_HANDLED)
669 */
670static irqreturn_t ab8500_btemp_lowmed_handler(int irq, void *_di)
671{
672 struct ab8500_btemp *di = _di;
673
674 dev_dbg(di->dev, "Battery temperature is between low and medium\n");
675
676 di->events.btemp_lowmed = true;
677 di->events.btemp_medhigh = false;
678 di->events.btemp_high = false;
679 di->events.btemp_low = false;
680 power_supply_changed(&di->btemp_psy);
681
682 return IRQ_HANDLED;
683}
684
685/**
686 * ab8500_btemp_medhigh_handler() - battery temp between medium and high
687 * @irq: interrupt number
688 * @_di: void pointer that has to address of ab8500_btemp
689 *
690 * Returns IRQ status(IRQ_HANDLED)
691 */
692static irqreturn_t ab8500_btemp_medhigh_handler(int irq, void *_di)
693{
694 struct ab8500_btemp *di = _di;
695
696 dev_dbg(di->dev, "Battery temperature is between medium and high\n");
697
698 di->events.btemp_medhigh = true;
699 di->events.btemp_lowmed = false;
700 di->events.btemp_high = false;
701 di->events.btemp_low = false;
702 power_supply_changed(&di->btemp_psy);
703
704 return IRQ_HANDLED;
705}
706
707/**
708 * ab8500_btemp_periodic() - Periodic temperature measurements
709 * @di: pointer to the ab8500_btemp structure
710 * @enable: enable or disable periodic temperature measurements
711 *
712 * Starts of stops periodic temperature measurements. Periodic measurements
713 * should only be done when a charger is connected.
714 */
715static void ab8500_btemp_periodic(struct ab8500_btemp *di,
716 bool enable)
717{
718 dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n",
719 enable);
720 /*
721 * Make sure a new measurement is done directly by cancelling
722 * any pending work
723 */
724 cancel_delayed_work_sync(&di->btemp_periodic_work);
725
726 if (enable)
727 queue_delayed_work(di->btemp_wq, &di->btemp_periodic_work, 0);
728}
729
730/**
731 * ab8500_btemp_get_temp() - get battery temperature
732 * @di: pointer to the ab8500_btemp structure
733 *
734 * Returns battery temperature
735 */
736static int ab8500_btemp_get_temp(struct ab8500_btemp *di)
737{
738 int temp = 0;
739
740 /*
d36e3e6d 741 * The BTEMP events are not reliabe on AB8500 cut3.3
1f855824
AM		 742 * and prior versions
743 */
d36e3e6d 744 if (is_ab8500_3p3_or_earlier(di->parent)) {
1f855824
AM		 745 temp = di->bat_temp * 10;
746 } else {
747 if (di->events.btemp_low) {
748 if (temp > di->btemp_ranges.btemp_low_limit)
5b41aa9f 749 temp = di->btemp_ranges.btemp_low_limit * 10;
1f855824
AM		 750 else
751 temp = di->bat_temp * 10;
752 } else if (di->events.btemp_high) {
753 if (temp < di->btemp_ranges.btemp_high_limit)
5b41aa9f 754 temp = di->btemp_ranges.btemp_high_limit * 10;
1f855824
AM		 755 else
756 temp = di->bat_temp * 10;
757 } else if (di->events.btemp_lowmed) {
758 if (temp > di->btemp_ranges.btemp_med_limit)
5b41aa9f 759 temp = di->btemp_ranges.btemp_med_limit * 10;
1f855824
AM		 760 else
761 temp = di->bat_temp * 10;
762 } else if (di->events.btemp_medhigh) {
763 if (temp < di->btemp_ranges.btemp_med_limit)
5b41aa9f 764 temp = di->btemp_ranges.btemp_med_limit * 10;
1f855824
AM		 765 else
766 temp = di->bat_temp * 10;
767 } else
768 temp = di->bat_temp * 10;
769 }
770 return temp;
771}
772
773/**
774 * ab8500_btemp_get_batctrl_temp() - get the temperature
775 * @btemp: pointer to the btemp structure
776 *
777 * Returns the batctrl temperature in millidegrees
778 */
779int ab8500_btemp_get_batctrl_temp(struct ab8500_btemp *btemp)
780{
781 return btemp->bat_temp * 1000;
782}
783
784/**
785 * ab8500_btemp_get_property() - get the btemp properties
786 * @psy: pointer to the power_supply structure
787 * @psp: pointer to the power_supply_property structure
788 * @val: pointer to the power_supply_propval union
789 *
790 * This function gets called when an application tries to get the btemp
791 * properties by reading the sysfs files.
792 * online: presence of the battery
793 * present: presence of the battery
794 * technology: battery technology
795 * temp: battery temperature
796 * Returns error code in case of failure else 0(on success)
797 */
798static int ab8500_btemp_get_property(struct power_supply *psy,
799 enum power_supply_property psp,
800 union power_supply_propval *val)
801{
802 struct ab8500_btemp *di;
803
804 di = to_ab8500_btemp_device_info(psy);
805
806 switch (psp) {
807 case POWER_SUPPLY_PROP_PRESENT:
808 case POWER_SUPPLY_PROP_ONLINE:
809 if (di->events.batt_rem)
810 val->intval = 0;
811 else
812 val->intval = 1;
813 break;
814 case POWER_SUPPLY_PROP_TECHNOLOGY:
b0284de0 815 val->intval = di->bm->bat_type[di->bm->batt_id].name;
1f855824
AM		 816 break;
817 case POWER_SUPPLY_PROP_TEMP:
818 val->intval = ab8500_btemp_get_temp(di);
819 break;
820 default:
821 return -EINVAL;
822 }
823 return 0;
824}
825
826static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data)
827{
828 struct power_supply *psy;
829 struct power_supply *ext;
830 struct ab8500_btemp *di;
831 union power_supply_propval ret;
832 int i, j;
833 bool psy_found = false;
834
835 psy = (struct power_supply *)data;
836 ext = dev_get_drvdata(dev);
837 di = to_ab8500_btemp_device_info(psy);
838
839 /*
840 * For all psy where the name of your driver
841 * appears in any supplied_to
842 */
843 for (i = 0; i < ext->num_supplicants; i++) {
844 if (!strcmp(ext->supplied_to[i], psy->name))
845 psy_found = true;
846 }
847
848 if (!psy_found)
849 return 0;
850
851 /* Go through all properties for the psy */
852 for (j = 0; j < ext->num_properties; j++) {
853 enum power_supply_property prop;
854 prop = ext->properties[j];
855
856 if (ext->get_property(ext, prop, &ret))
857 continue;
858
859 switch (prop) {
860 case POWER_SUPPLY_PROP_PRESENT:
861 switch (ext->type) {
862 case POWER_SUPPLY_TYPE_MAINS:
863 /* AC disconnected */
864 if (!ret.intval && di->events.ac_conn) {
865 di->events.ac_conn = false;
866 }
867 /* AC connected */
868 else if (ret.intval && !di->events.ac_conn) {
869 di->events.ac_conn = true;
870 if (!di->events.usb_conn)
871 ab8500_btemp_periodic(di, true);
872 }
873 break;
874 case POWER_SUPPLY_TYPE_USB:
875 /* USB disconnected */
876 if (!ret.intval && di->events.usb_conn) {
877 di->events.usb_conn = false;
878 }
879 /* USB connected */
880 else if (ret.intval && !di->events.usb_conn) {
881 di->events.usb_conn = true;
882 if (!di->events.ac_conn)
883 ab8500_btemp_periodic(di, true);
884 }
885 break;
886 default:
887 break;
888 }
889 break;
890 default:
891 break;
892 }
893 }
894 return 0;
895}
896
897/**
898 * ab8500_btemp_external_power_changed() - callback for power supply changes
899 * @psy: pointer to the structure power_supply
900 *
901 * This function is pointing to the function pointer external_power_changed
902 * of the structure power_supply.
903 * This function gets executed when there is a change in the external power
904 * supply to the btemp.
905 */
906static void ab8500_btemp_external_power_changed(struct power_supply *psy)
907{
908 struct ab8500_btemp *di = to_ab8500_btemp_device_info(psy);
909
910 class_for_each_device(power_supply_class, NULL,
911 &di->btemp_psy, ab8500_btemp_get_ext_psy_data);
912}
913
914/* ab8500 btemp driver interrupts and their respective isr */
915static struct ab8500_btemp_interrupts ab8500_btemp_irq[] = {
916 {"BAT_CTRL_INDB", ab8500_btemp_batctrlindb_handler},
917 {"BTEMP_LOW", ab8500_btemp_templow_handler},
918 {"BTEMP_HIGH", ab8500_btemp_temphigh_handler},
919 {"BTEMP_LOW_MEDIUM", ab8500_btemp_lowmed_handler},
920 {"BTEMP_MEDIUM_HIGH", ab8500_btemp_medhigh_handler},
921};
922
923#if defined(CONFIG_PM)
924static int ab8500_btemp_resume(struct platform_device *pdev)
925{
926 struct ab8500_btemp *di = platform_get_drvdata(pdev);
927
928 ab8500_btemp_periodic(di, true);
929
930 return 0;
931}
932
933static int ab8500_btemp_suspend(struct platform_device *pdev,
934 pm_message_t state)
935{
936 struct ab8500_btemp *di = platform_get_drvdata(pdev);
937
938 ab8500_btemp_periodic(di, false);
939
940 return 0;
941}
942#else
943#define ab8500_btemp_suspend NULL
944#define ab8500_btemp_resume NULL
945#endif
946
415ec69f 947static int ab8500_btemp_remove(struct platform_device *pdev)
1f855824
AM		 948{
949 struct ab8500_btemp *di = platform_get_drvdata(pdev);
950 int i, irq;
951
952 /* Disable interrupts */
953 for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
954 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
955 free_irq(irq, di);
956 }
957
958 /* Delete the work queue */
959 destroy_workqueue(di->btemp_wq);
960
961 flush_scheduled_work();
962 power_supply_unregister(&di->btemp_psy);
963 platform_set_drvdata(pdev, NULL);
1f855824
AM		 964
965 return 0;
966}
967
bd9e8ab2
R		 968static char *supply_interface[] = {
969 "ab8500_chargalg",
970 "ab8500_fg",
971};
972
c8afa640 973static int ab8500_btemp_probe(struct platform_device *pdev)
1f855824 974{
bd9e8ab2 975 struct device_node *np = pdev->dev.of_node;
95820245 976 struct abx500_bm_data *plat = pdev->dev.platform_data;
e0f1abeb 977 struct ab8500_btemp *di;
1f855824
AM		 978 int irq, i, ret = 0;
979 u8 val;
2aac3de1 980
bd9e8ab2
R		 981 di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
982 if (!di) {
983 dev_err(&pdev->dev, "%s no mem for ab8500_btemp\n", __func__);
1f855824 984 return -ENOMEM;
bd9e8ab2 985 }
95820245
LJ		 986
987 if (!plat) {
988 dev_err(&pdev->dev, "no battery management data supplied\n");
989 return -EINVAL;
990 }
991 di->bm = plat;
992
993 if (np) {
994 ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
995 if (ret) {
996 dev_err(&pdev->dev, "failed to get battery information\n");
997 return ret;
bd9e8ab2 998 }
bd9e8ab2 999 }
1f855824
AM		 1000
1001 /* get parent data */
1002 di->dev = &pdev->dev;
1003 di->parent = dev_get_drvdata(pdev->dev.parent);
1004 di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
1005
f6271b4f
JA		 1006 di->initialized = false;
1007
1f855824
AM		 1008 /* BTEMP supply */
1009 di->btemp_psy.name = "ab8500_btemp";
1010 di->btemp_psy.type = POWER_SUPPLY_TYPE_BATTERY;
1011 di->btemp_psy.properties = ab8500_btemp_props;
1012 di->btemp_psy.num_properties = ARRAY_SIZE(ab8500_btemp_props);
1013 di->btemp_psy.get_property = ab8500_btemp_get_property;
bd9e8ab2
R		 1014 di->btemp_psy.supplied_to = supply_interface;
1015 di->btemp_psy.num_supplicants = ARRAY_SIZE(supply_interface);
1f855824
AM		 1016 di->btemp_psy.external_power_changed =
1017 ab8500_btemp_external_power_changed;
1018
1019
1020 /* Create a work queue for the btemp */
1021 di->btemp_wq =
1022 create_singlethread_workqueue("ab8500_btemp_wq");
1023 if (di->btemp_wq == NULL) {
1024 dev_err(di->dev, "failed to create work queue\n");
bd9e8ab2 1025 return -ENOMEM;
1f855824
AM		 1026 }
1027
1028 /* Init work for measuring temperature periodically */
203b42f7 1029 INIT_DEFERRABLE_WORK(&di->btemp_periodic_work,
1f855824
AM		 1030 ab8500_btemp_periodic_work);
1031
1f855824 1032 /* Set BTEMP thermal limits. Low and Med are fixed */
5b41aa9f
LJ		 1033 di->btemp_ranges.btemp_low_limit = BTEMP_THERMAL_LOW_LIMIT * 10;
1034 di->btemp_ranges.btemp_med_limit = BTEMP_THERMAL_MED_LIMIT * 10;
1f855824
AM		 1035
1036 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1037 AB8500_BTEMP_HIGH_TH, &val);
1038 if (ret < 0) {
1039 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1040 goto free_btemp_wq;
1041 }
1042 switch (val) {
1043 case BTEMP_HIGH_TH_57_0:
1044 case BTEMP_HIGH_TH_57_1:
1045 di->btemp_ranges.btemp_high_limit =
1046 BTEMP_THERMAL_HIGH_LIMIT_57;
1047 break;
1048 case BTEMP_HIGH_TH_52:
1049 di->btemp_ranges.btemp_high_limit =
1050 BTEMP_THERMAL_HIGH_LIMIT_52;
1051 break;
1052 case BTEMP_HIGH_TH_62:
1053 di->btemp_ranges.btemp_high_limit =
1054 BTEMP_THERMAL_HIGH_LIMIT_62;
1055 break;
1056 }
1057
1058 /* Register BTEMP power supply class */
1059 ret = power_supply_register(di->dev, &di->btemp_psy);
1060 if (ret) {
1061 dev_err(di->dev, "failed to register BTEMP psy\n");
1062 goto free_btemp_wq;
1063 }
1064
1065 /* Register interrupts */
1066 for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
1067 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1068 ret = request_threaded_irq(irq, NULL, ab8500_btemp_irq[i].isr,
1069 IRQF_SHARED | IRQF_NO_SUSPEND,
1070 ab8500_btemp_irq[i].name, di);
1071
1072 if (ret) {
1073 dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
1074 , ab8500_btemp_irq[i].name, irq, ret);
1075 goto free_irq;
1076 }
1077 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
1078 ab8500_btemp_irq[i].name, irq, ret);
1079 }
1080
1081 platform_set_drvdata(pdev, di);
1082
1083 /* Kick off periodic temperature measurements */
1084 ab8500_btemp_periodic(di, true);
1085 list_add_tail(&di->node, &ab8500_btemp_list);
1086
1087 return ret;
1088
1089free_irq:
1090 power_supply_unregister(&di->btemp_psy);
1091
1092 /* We also have to free all successfully registered irqs */
1093 for (i = i - 1; i >= 0; i--) {
1094 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1095 free_irq(irq, di);
1096 }
1097free_btemp_wq:
1098 destroy_workqueue(di->btemp_wq);
1f855824
AM		 1099 return ret;
1100}
1101
bd9e8ab2
R		 1102static const struct of_device_id ab8500_btemp_match[] = {
1103 { .compatible = "stericsson,ab8500-btemp", },
1104 { },
1105};
1106
1f855824
AM		 1107static struct platform_driver ab8500_btemp_driver = {
1108 .probe = ab8500_btemp_probe,
28ea73f4 1109 .remove = ab8500_btemp_remove,
1f855824
AM		 1110 .suspend = ab8500_btemp_suspend,
1111 .resume = ab8500_btemp_resume,
1112 .driver = {
1113 .name = "ab8500-btemp",
1114 .owner = THIS_MODULE,
bd9e8ab2 1115 .of_match_table = ab8500_btemp_match,
1f855824
AM		 1116 },
1117};
1118
1119static int __init ab8500_btemp_init(void)
1120{
1121 return platform_driver_register(&ab8500_btemp_driver);
1122}
1123
1124static void __exit ab8500_btemp_exit(void)
1125{
1126 platform_driver_unregister(&ab8500_btemp_driver);
1127}
1128
1129subsys_initcall_sync(ab8500_btemp_init);
1130module_exit(ab8500_btemp_exit);
1131
1132MODULE_LICENSE("GPL v2");
1133MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
1134MODULE_ALIAS("platform:ab8500-btemp");
1135MODULE_DESCRIPTION("AB8500 battery temperature driver");
Linux 6.x block layer and io_uring tree(s)