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ab8500-btemp: AB8500 battery temperature driver
[GitHub/mt8127/android_kernel_alcatel_ttab.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>
23#include <linux/mfd/abx500/ab8500.h>
24#include <linux/mfd/abx500.h>
25#include <linux/mfd/abx500/ab8500-bm.h>
26#include <linux/mfd/abx500/ab8500-gpadc.h>
27#include <linux/jiffies.h>
28
29#define VTVOUT_V 1800
30
31#define BTEMP_THERMAL_LOW_LIMIT -10
32#define BTEMP_THERMAL_MED_LIMIT 0
33#define BTEMP_THERMAL_HIGH_LIMIT_52 52
34#define BTEMP_THERMAL_HIGH_LIMIT_57 57
35#define BTEMP_THERMAL_HIGH_LIMIT_62 62
36
37#define BTEMP_BATCTRL_CURR_SRC_7UA 7
38#define BTEMP_BATCTRL_CURR_SRC_20UA 20
39
40#define to_ab8500_btemp_device_info(x) container_of((x), \
41 struct ab8500_btemp, btemp_psy);
42
43/**
44 * struct ab8500_btemp_interrupts - ab8500 interrupts
45 * @name: name of the interrupt
46 * @isr function pointer to the isr
47 */
48struct ab8500_btemp_interrupts {
49 char *name;
50 irqreturn_t (*isr)(int irq, void *data);
51};
52
53struct ab8500_btemp_events {
54 bool batt_rem;
55 bool btemp_high;
56 bool btemp_medhigh;
57 bool btemp_lowmed;
58 bool btemp_low;
59 bool ac_conn;
60 bool usb_conn;
61};
62
63struct ab8500_btemp_ranges {
64 int btemp_high_limit;
65 int btemp_med_limit;
66 int btemp_low_limit;
67};
68
69/**
70 * struct ab8500_btemp - ab8500 BTEMP device information
71 * @dev: Pointer to the structure device
72 * @node: List of AB8500 BTEMPs, hence prepared for reentrance
73 * @curr_source: What current source we use, in uA
74 * @bat_temp: Battery temperature in degree Celcius
75 * @prev_bat_temp Last dispatched battery temperature
76 * @parent: Pointer to the struct ab8500
77 * @gpadc: Pointer to the struct gpadc
78 * @fg: Pointer to the struct fg
79 * @pdata: Pointer to the abx500_btemp platform data
80 * @bat: Pointer to the abx500_bm platform data
81 * @btemp_psy: Structure for BTEMP specific battery properties
82 * @events: Structure for information about events triggered
83 * @btemp_ranges: Battery temperature range structure
84 * @btemp_wq: Work queue for measuring the temperature periodically
85 * @btemp_periodic_work: Work for measuring the temperature periodically
86 */
87struct ab8500_btemp {
88 struct device *dev;
89 struct list_head node;
90 int curr_source;
91 int bat_temp;
92 int prev_bat_temp;
93 struct ab8500 *parent;
94 struct ab8500_gpadc *gpadc;
95 struct ab8500_fg *fg;
96 struct abx500_btemp_platform_data *pdata;
97 struct abx500_bm_data *bat;
98 struct power_supply btemp_psy;
99 struct ab8500_btemp_events events;
100 struct ab8500_btemp_ranges btemp_ranges;
101 struct workqueue_struct *btemp_wq;
102 struct delayed_work btemp_periodic_work;
103};
104
105/* BTEMP power supply properties */
106static enum power_supply_property ab8500_btemp_props[] = {
107 POWER_SUPPLY_PROP_PRESENT,
108 POWER_SUPPLY_PROP_ONLINE,
109 POWER_SUPPLY_PROP_TECHNOLOGY,
110 POWER_SUPPLY_PROP_TEMP,
111};
112
113static LIST_HEAD(ab8500_btemp_list);
114
115/**
116 * ab8500_btemp_get() - returns a reference to the primary AB8500 BTEMP
117 * (i.e. the first BTEMP in the instance list)
118 */
119struct ab8500_btemp *ab8500_btemp_get(void)
120{
121 struct ab8500_btemp *btemp;
122 btemp = list_first_entry(&ab8500_btemp_list, struct ab8500_btemp, node);
123
124 return btemp;
125}
126
127/**
128 * ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance
129 * @di: pointer to the ab8500_btemp structure
130 * @v_batctrl: measured batctrl voltage
131 * @inst_curr: measured instant current
132 *
133 * This function returns the battery resistance that is
134 * derived from the BATCTRL voltage.
135 * Returns value in Ohms.
136 */
137static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di,
138 int v_batctrl, int inst_curr)
139{
140 int rbs;
141
142 if (is_ab8500_1p1_or_earlier(di->parent)) {
143 /*
144 * For ABB cut1.0 and 1.1 BAT_CTRL is internally
145 * connected to 1.8V through a 450k resistor
146 */
147 return (450000 * (v_batctrl)) / (1800 - v_batctrl);
148 }
149
150 if (di->bat->adc_therm == ADC_THERM_BATCTRL) {
151 /*
152 * If the battery has internal NTC, we use the current
153 * source to calculate the resistance, 7uA or 20uA
154 */
155 rbs = (v_batctrl * 1000
156 - di->bat->gnd_lift_resistance * inst_curr)
157 / di->curr_source;
158 } else {
159 /*
160 * BAT_CTRL is internally
161 * connected to 1.8V through a 80k resistor
162 */
163 rbs = (80000 * (v_batctrl)) / (1800 - v_batctrl);
164 }
165
166 return rbs;
167}
168
169/**
170 * ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage
171 * @di: pointer to the ab8500_btemp structure
172 *
173 * This function returns the voltage on BATCTRL. Returns value in mV.
174 */
175static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp *di)
176{
177 int vbtemp;
178 static int prev;
179
180 vbtemp = ab8500_gpadc_convert(di->gpadc, BAT_CTRL);
181 if (vbtemp < 0) {
182 dev_err(di->dev,
183 "%s gpadc conversion failed, using previous value",
184 __func__);
185 return prev;
186 }
187 prev = vbtemp;
188 return vbtemp;
189}
190
191/**
192 * ab8500_btemp_curr_source_enable() - enable/disable batctrl current source
193 * @di: pointer to the ab8500_btemp structure
194 * @enable: enable or disable the current source
195 *
196 * Enable or disable the current sources for the BatCtrl AD channel
197 */
198static int ab8500_btemp_curr_source_enable(struct ab8500_btemp *di,
199 bool enable)
200{
201 int curr;
202 int ret = 0;
203
204 /*
205 * BATCTRL current sources are included on AB8500 cut2.0
206 * and future versions
207 */
208 if (is_ab8500_1p1_or_earlier(di->parent))
209 return 0;
210
211 /* Only do this for batteries with internal NTC */
212 if (di->bat->adc_therm == ADC_THERM_BATCTRL && enable) {
213 if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_7UA)
214 curr = BAT_CTRL_7U_ENA;
215 else
216 curr = BAT_CTRL_20U_ENA;
217
218 dev_dbg(di->dev, "Set BATCTRL %duA\n", di->curr_source);
219
220 ret = abx500_mask_and_set_register_interruptible(di->dev,
221 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
222 FORCE_BAT_CTRL_CMP_HIGH, FORCE_BAT_CTRL_CMP_HIGH);
223 if (ret) {
224 dev_err(di->dev, "%s failed setting cmp_force\n",
225 __func__);
226 return ret;
227 }
228
229 /*
230 * We have to wait one 32kHz cycle before enabling
231 * the current source, since ForceBatCtrlCmpHigh needs
232 * to be written in a separate cycle
233 */
234 udelay(32);
235
236 ret = abx500_set_register_interruptible(di->dev,
237 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
238 FORCE_BAT_CTRL_CMP_HIGH | curr);
239 if (ret) {
240 dev_err(di->dev, "%s failed enabling current source\n",
241 __func__);
242 goto disable_curr_source;
243 }
244 } else if (di->bat->adc_therm == ADC_THERM_BATCTRL && !enable) {
245 dev_dbg(di->dev, "Disable BATCTRL curr source\n");
246
247 /* Write 0 to the curr bits */
248 ret = abx500_mask_and_set_register_interruptible(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 if (ret) {
253 dev_err(di->dev, "%s failed disabling current source\n",
254 __func__);
255 goto disable_curr_source;
256 }
257
258 /* Enable Pull-Up and comparator */
259 ret = abx500_mask_and_set_register_interruptible(di->dev,
260 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
261 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
262 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
263 if (ret) {
264 dev_err(di->dev, "%s failed enabling PU and comp\n",
265 __func__);
266 goto enable_pu_comp;
267 }
268
269 /*
270 * We have to wait one 32kHz cycle before disabling
271 * ForceBatCtrlCmpHigh since this needs to be written
272 * in a separate cycle
273 */
274 udelay(32);
275
276 /* Disable 'force comparator' */
277 ret = abx500_mask_and_set_register_interruptible(di->dev,
278 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
279 FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
280 if (ret) {
281 dev_err(di->dev, "%s failed disabling force comp\n",
282 __func__);
283 goto disable_force_comp;
284 }
285 }
286 return ret;
287
288 /*
289 * We have to try unsetting FORCE_BAT_CTRL_CMP_HIGH one more time
290 * if we got an error above
291 */
292disable_curr_source:
293 /* Write 0 to the curr bits */
294 ret = abx500_mask_and_set_register_interruptible(di->dev,
295 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
296 BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
297 ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
298 if (ret) {
299 dev_err(di->dev, "%s failed disabling current source\n",
300 __func__);
301 return ret;
302 }
303enable_pu_comp:
304 /* Enable Pull-Up and comparator */
305 ret = abx500_mask_and_set_register_interruptible(di->dev,
306 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
307 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
308 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
309 if (ret) {
310 dev_err(di->dev, "%s failed enabling PU and comp\n",
311 __func__);
312 return ret;
313 }
314
315disable_force_comp:
316 /*
317 * We have to wait one 32kHz cycle before disabling
318 * ForceBatCtrlCmpHigh since this needs to be written
319 * in a separate cycle
320 */
321 udelay(32);
322
323 /* Disable 'force comparator' */
324 ret = abx500_mask_and_set_register_interruptible(di->dev,
325 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
326 FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
327 if (ret) {
328 dev_err(di->dev, "%s failed disabling force comp\n",
329 __func__);
330 return ret;
331 }
332
333 return ret;
334}
335
336/**
337 * ab8500_btemp_get_batctrl_res() - get battery resistance
338 * @di: pointer to the ab8500_btemp structure
339 *
340 * This function returns the battery pack identification resistance.
341 * Returns value in Ohms.
342 */
343static int ab8500_btemp_get_batctrl_res(struct ab8500_btemp *di)
344{
345 int ret;
346 int batctrl = 0;
347 int res;
348 int inst_curr;
349 int i;
350
351 /*
352 * BATCTRL current sources are included on AB8500 cut2.0
353 * and future versions
354 */
355 ret = ab8500_btemp_curr_source_enable(di, true);
356 if (ret) {
357 dev_err(di->dev, "%s curr source enabled failed\n", __func__);
358 return ret;
359 }
360
361 if (!di->fg)
362 di->fg = ab8500_fg_get();
363 if (!di->fg) {
364 dev_err(di->dev, "No fg found\n");
365 return -EINVAL;
366 }
367
368 ret = ab8500_fg_inst_curr_start(di->fg);
369
370 if (ret) {
371 dev_err(di->dev, "Failed to start current measurement\n");
372 return ret;
373 }
374
375 /*
376 * Since there is no interrupt when current measurement is done,
377 * loop for over 250ms (250ms is one sample conversion time
378 * with 32.768 Khz RTC clock). Note that a stop time must be set
379 * since the ab8500_btemp_read_batctrl_voltage call can block and
380 * take an unknown amount of time to complete.
381 */
382 i = 0;
383
384 do {
385 batctrl += ab8500_btemp_read_batctrl_voltage(di);
386 i++;
387 msleep(20);
388 } while (!ab8500_fg_inst_curr_done(di->fg));
389 batctrl /= i;
390
391 ret = ab8500_fg_inst_curr_finalize(di->fg, &inst_curr);
392 if (ret) {
393 dev_err(di->dev, "Failed to finalize current measurement\n");
394 return ret;
395 }
396
397 res = ab8500_btemp_batctrl_volt_to_res(di, batctrl, inst_curr);
398
399 ret = ab8500_btemp_curr_source_enable(di, false);
400 if (ret) {
401 dev_err(di->dev, "%s curr source disable failed\n", __func__);
402 return ret;
403 }
404
405 dev_dbg(di->dev, "%s batctrl: %d res: %d inst_curr: %d samples: %d\n",
406 __func__, batctrl, res, inst_curr, i);
407
408 return res;
409}
410
411/**
412 * ab8500_btemp_res_to_temp() - resistance to temperature
413 * @di: pointer to the ab8500_btemp structure
414 * @tbl: pointer to the resiatance to temperature table
415 * @tbl_size: size of the resistance to temperature table
416 * @res: resistance to calculate the temperature from
417 *
418 * This function returns the battery temperature in degrees Celcius
419 * based on the NTC resistance.
420 */
421static int ab8500_btemp_res_to_temp(struct ab8500_btemp *di,
422 const struct abx500_res_to_temp *tbl, int tbl_size, int res)
423{
424 int i, temp;
425 /*
426 * Calculate the formula for the straight line
427 * Simple interpolation if we are within
428 * the resistance table limits, extrapolate
429 * if resistance is outside the limits.
430 */
431 if (res > tbl[0].resist)
432 i = 0;
433 else if (res <= tbl[tbl_size - 1].resist)
434 i = tbl_size - 2;
435 else {
436 i = 0;
437 while (!(res <= tbl[i].resist &&
438 res > tbl[i + 1].resist))
439 i++;
440 }
441
442 temp = tbl[i].temp + ((tbl[i + 1].temp - tbl[i].temp) *
443 (res - tbl[i].resist)) / (tbl[i + 1].resist - tbl[i].resist);
444 return temp;
445}
446
447/**
448 * ab8500_btemp_measure_temp() - measure battery temperature
449 * @di: pointer to the ab8500_btemp structure
450 *
451 * Returns battery temperature (on success) else the previous temperature
452 */
453static int ab8500_btemp_measure_temp(struct ab8500_btemp *di)
454{
455 int temp;
456 static int prev;
457 int rbat, rntc, vntc;
458 u8 id;
459
460 id = di->bat->batt_id;
461
462 if (di->bat->adc_therm == ADC_THERM_BATCTRL &&
463 id != BATTERY_UNKNOWN) {
464
465 rbat = ab8500_btemp_get_batctrl_res(di);
466 if (rbat < 0) {
467 dev_err(di->dev, "%s get batctrl res failed\n",
468 __func__);
469 /*
470 * Return out-of-range temperature so that
471 * charging is stopped
472 */
473 return BTEMP_THERMAL_LOW_LIMIT;
474 }
475
476 temp = ab8500_btemp_res_to_temp(di,
477 di->bat->bat_type[id].r_to_t_tbl,
478 di->bat->bat_type[id].n_temp_tbl_elements, rbat);
479 } else {
480 vntc = ab8500_gpadc_convert(di->gpadc, BTEMP_BALL);
481 if (vntc < 0) {
482 dev_err(di->dev,
483 "%s gpadc conversion failed,"
484 " using previous value\n", __func__);
485 return prev;
486 }
487 /*
488 * The PCB NTC is sourced from VTVOUT via a 230kOhm
489 * resistor.
490 */
491 rntc = 230000 * vntc / (VTVOUT_V - vntc);
492
493 temp = ab8500_btemp_res_to_temp(di,
494 di->bat->bat_type[id].r_to_t_tbl,
495 di->bat->bat_type[id].n_temp_tbl_elements, rntc);
496 prev = temp;
497 }
498 dev_dbg(di->dev, "Battery temperature is %d\n", temp);
499 return temp;
500}
501
502/**
503 * ab8500_btemp_id() - Identify the connected battery
504 * @di: pointer to the ab8500_btemp structure
505 *
506 * This function will try to identify the battery by reading the ID
507 * resistor. Some brands use a combined ID resistor with a NTC resistor to
508 * both be able to identify and to read the temperature of it.
509 */
510static int ab8500_btemp_id(struct ab8500_btemp *di)
511{
512 int res;
513 u8 i;
514
515 di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA;
516 di->bat->batt_id = BATTERY_UNKNOWN;
517
518 res = ab8500_btemp_get_batctrl_res(di);
519 if (res < 0) {
520 dev_err(di->dev, "%s get batctrl res failed\n", __func__);
521 return -ENXIO;
522 }
523
524 /* BATTERY_UNKNOWN is defined on position 0, skip it! */
525 for (i = BATTERY_UNKNOWN + 1; i < di->bat->n_btypes; i++) {
526 if ((res <= di->bat->bat_type[i].resis_high) &&
527 (res >= di->bat->bat_type[i].resis_low)) {
528 dev_dbg(di->dev, "Battery detected on %s"
529 " low %d < res %d < high: %d"
530 " index: %d\n",
531 di->bat->adc_therm == ADC_THERM_BATCTRL ?
532 "BATCTRL" : "BATTEMP",
533 di->bat->bat_type[i].resis_low, res,
534 di->bat->bat_type[i].resis_high, i);
535
536 di->bat->batt_id = i;
537 break;
538 }
539 }
540
541 if (di->bat->batt_id == BATTERY_UNKNOWN) {
542 dev_warn(di->dev, "Battery identified as unknown"
543 ", resistance %d Ohm\n", res);
544 return -ENXIO;
545 }
546
547 /*
548 * We only have to change current source if the
549 * detected type is Type 1, else we use the 7uA source
550 */
551 if (di->bat->adc_therm == ADC_THERM_BATCTRL && di->bat->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->bat->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 */
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
571 di->bat_temp = ab8500_btemp_measure_temp(di);
572
573 if (di->bat_temp != di->prev_bat_temp) {
574 di->prev_bat_temp = di->bat_temp;
575 power_supply_changed(&di->btemp_psy);
576 }
577
578 if (di->events.ac_conn || di->events.usb_conn)
579 interval = di->bat->temp_interval_chg;
580 else
581 interval = di->bat->temp_interval_nochg;
582
583 /* Schedule a new measurement */
584 queue_delayed_work(di->btemp_wq,
585 &di->btemp_periodic_work,
586 round_jiffies(interval * HZ));
587}
588
589/**
590 * ab8500_btemp_batctrlindb_handler() - battery removal detected
591 * @irq: interrupt number
592 * @_di: void pointer that has to address of ab8500_btemp
593 *
594 * Returns IRQ status(IRQ_HANDLED)
595 */
596static irqreturn_t ab8500_btemp_batctrlindb_handler(int irq, void *_di)
597{
598 struct ab8500_btemp *di = _di;
599 dev_err(di->dev, "Battery removal detected!\n");
600
601 di->events.batt_rem = true;
602 power_supply_changed(&di->btemp_psy);
603
604 return IRQ_HANDLED;
605}
606
607/**
608 * ab8500_btemp_templow_handler() - battery temp lower than 10 degrees
609 * @irq: interrupt number
610 * @_di: void pointer that has to address of ab8500_btemp
611 *
612 * Returns IRQ status(IRQ_HANDLED)
613 */
614static irqreturn_t ab8500_btemp_templow_handler(int irq, void *_di)
615{
616 struct ab8500_btemp *di = _di;
617
618 if (is_ab8500_2p0_or_earlier(di->parent)) {
619 dev_dbg(di->dev, "Ignore false btemp low irq"
620 " for ABB cut 1.0, 1.1 and 2.0\n");
621 } else {
622 dev_crit(di->dev, "Battery temperature lower than -10deg c\n");
623
624 di->events.btemp_low = true;
625 di->events.btemp_high = false;
626 di->events.btemp_medhigh = false;
627 di->events.btemp_lowmed = false;
628 power_supply_changed(&di->btemp_psy);
629 }
630
631 return IRQ_HANDLED;
632}
633
634/**
635 * ab8500_btemp_temphigh_handler() - battery temp higher than max temp
636 * @irq: interrupt number
637 * @_di: void pointer that has to address of ab8500_btemp
638 *
639 * Returns IRQ status(IRQ_HANDLED)
640 */
641static irqreturn_t ab8500_btemp_temphigh_handler(int irq, void *_di)
642{
643 struct ab8500_btemp *di = _di;
644
645 dev_crit(di->dev, "Battery temperature is higher than MAX temp\n");
646
647 di->events.btemp_high = true;
648 di->events.btemp_medhigh = false;
649 di->events.btemp_lowmed = false;
650 di->events.btemp_low = false;
651 power_supply_changed(&di->btemp_psy);
652
653 return IRQ_HANDLED;
654}
655
656/**
657 * ab8500_btemp_lowmed_handler() - battery temp between low and medium
658 * @irq: interrupt number
659 * @_di: void pointer that has to address of ab8500_btemp
660 *
661 * Returns IRQ status(IRQ_HANDLED)
662 */
663static irqreturn_t ab8500_btemp_lowmed_handler(int irq, void *_di)
664{
665 struct ab8500_btemp *di = _di;
666
667 dev_dbg(di->dev, "Battery temperature is between low and medium\n");
668
669 di->events.btemp_lowmed = true;
670 di->events.btemp_medhigh = false;
671 di->events.btemp_high = 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_medhigh_handler() - battery temp between medium and high
680 * @irq: interrupt number
681 * @_di: void pointer that has to address of ab8500_btemp
682 *
683 * Returns IRQ status(IRQ_HANDLED)
684 */
685static irqreturn_t ab8500_btemp_medhigh_handler(int irq, void *_di)
686{
687 struct ab8500_btemp *di = _di;
688
689 dev_dbg(di->dev, "Battery temperature is between medium and high\n");
690
691 di->events.btemp_medhigh = true;
692 di->events.btemp_lowmed = 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_periodic() - Periodic temperature measurements
702 * @di: pointer to the ab8500_btemp structure
703 * @enable: enable or disable periodic temperature measurements
704 *
705 * Starts of stops periodic temperature measurements. Periodic measurements
706 * should only be done when a charger is connected.
707 */
708static void ab8500_btemp_periodic(struct ab8500_btemp *di,
709 bool enable)
710{
711 dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n",
712 enable);
713 /*
714 * Make sure a new measurement is done directly by cancelling
715 * any pending work
716 */
717 cancel_delayed_work_sync(&di->btemp_periodic_work);
718
719 if (enable)
720 queue_delayed_work(di->btemp_wq, &di->btemp_periodic_work, 0);
721}
722
723/**
724 * ab8500_btemp_get_temp() - get battery temperature
725 * @di: pointer to the ab8500_btemp structure
726 *
727 * Returns battery temperature
728 */
729static int ab8500_btemp_get_temp(struct ab8500_btemp *di)
730{
731 int temp = 0;
732
733 /*
734 * The BTEMP events are not reliabe on AB8500 cut2.0
735 * and prior versions
736 */
737 if (is_ab8500_2p0_or_earlier(di->parent)) {
738 temp = di->bat_temp * 10;
739 } else {
740 if (di->events.btemp_low) {
741 if (temp > di->btemp_ranges.btemp_low_limit)
742 temp = di->btemp_ranges.btemp_low_limit;
743 else
744 temp = di->bat_temp * 10;
745 } else if (di->events.btemp_high) {
746 if (temp < di->btemp_ranges.btemp_high_limit)
747 temp = di->btemp_ranges.btemp_high_limit;
748 else
749 temp = di->bat_temp * 10;
750 } else if (di->events.btemp_lowmed) {
751 if (temp > di->btemp_ranges.btemp_med_limit)
752 temp = di->btemp_ranges.btemp_med_limit;
753 else
754 temp = di->bat_temp * 10;
755 } else if (di->events.btemp_medhigh) {
756 if (temp < di->btemp_ranges.btemp_med_limit)
757 temp = di->btemp_ranges.btemp_med_limit;
758 else
759 temp = di->bat_temp * 10;
760 } else
761 temp = di->bat_temp * 10;
762 }
763 return temp;
764}
765
766/**
767 * ab8500_btemp_get_batctrl_temp() - get the temperature
768 * @btemp: pointer to the btemp structure
769 *
770 * Returns the batctrl temperature in millidegrees
771 */
772int ab8500_btemp_get_batctrl_temp(struct ab8500_btemp *btemp)
773{
774 return btemp->bat_temp * 1000;
775}
776
777/**
778 * ab8500_btemp_get_property() - get the btemp properties
779 * @psy: pointer to the power_supply structure
780 * @psp: pointer to the power_supply_property structure
781 * @val: pointer to the power_supply_propval union
782 *
783 * This function gets called when an application tries to get the btemp
784 * properties by reading the sysfs files.
785 * online: presence of the battery
786 * present: presence of the battery
787 * technology: battery technology
788 * temp: battery temperature
789 * Returns error code in case of failure else 0(on success)
790 */
791static int ab8500_btemp_get_property(struct power_supply *psy,
792 enum power_supply_property psp,
793 union power_supply_propval *val)
794{
795 struct ab8500_btemp *di;
796
797 di = to_ab8500_btemp_device_info(psy);
798
799 switch (psp) {
800 case POWER_SUPPLY_PROP_PRESENT:
801 case POWER_SUPPLY_PROP_ONLINE:
802 if (di->events.batt_rem)
803 val->intval = 0;
804 else
805 val->intval = 1;
806 break;
807 case POWER_SUPPLY_PROP_TECHNOLOGY:
808 val->intval = di->bat->bat_type[di->bat->batt_id].name;
809 break;
810 case POWER_SUPPLY_PROP_TEMP:
811 val->intval = ab8500_btemp_get_temp(di);
812 break;
813 default:
814 return -EINVAL;
815 }
816 return 0;
817}
818
819static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data)
820{
821 struct power_supply *psy;
822 struct power_supply *ext;
823 struct ab8500_btemp *di;
824 union power_supply_propval ret;
825 int i, j;
826 bool psy_found = false;
827
828 psy = (struct power_supply *)data;
829 ext = dev_get_drvdata(dev);
830 di = to_ab8500_btemp_device_info(psy);
831
832 /*
833 * For all psy where the name of your driver
834 * appears in any supplied_to
835 */
836 for (i = 0; i < ext->num_supplicants; i++) {
837 if (!strcmp(ext->supplied_to[i], psy->name))
838 psy_found = true;
839 }
840
841 if (!psy_found)
842 return 0;
843
844 /* Go through all properties for the psy */
845 for (j = 0; j < ext->num_properties; j++) {
846 enum power_supply_property prop;
847 prop = ext->properties[j];
848
849 if (ext->get_property(ext, prop, &ret))
850 continue;
851
852 switch (prop) {
853 case POWER_SUPPLY_PROP_PRESENT:
854 switch (ext->type) {
855 case POWER_SUPPLY_TYPE_MAINS:
856 /* AC disconnected */
857 if (!ret.intval && di->events.ac_conn) {
858 di->events.ac_conn = false;
859 }
860 /* AC connected */
861 else if (ret.intval && !di->events.ac_conn) {
862 di->events.ac_conn = true;
863 if (!di->events.usb_conn)
864 ab8500_btemp_periodic(di, true);
865 }
866 break;
867 case POWER_SUPPLY_TYPE_USB:
868 /* USB disconnected */
869 if (!ret.intval && di->events.usb_conn) {
870 di->events.usb_conn = false;
871 }
872 /* USB connected */
873 else if (ret.intval && !di->events.usb_conn) {
874 di->events.usb_conn = true;
875 if (!di->events.ac_conn)
876 ab8500_btemp_periodic(di, true);
877 }
878 break;
879 default:
880 break;
881 }
882 break;
883 default:
884 break;
885 }
886 }
887 return 0;
888}
889
890/**
891 * ab8500_btemp_external_power_changed() - callback for power supply changes
892 * @psy: pointer to the structure power_supply
893 *
894 * This function is pointing to the function pointer external_power_changed
895 * of the structure power_supply.
896 * This function gets executed when there is a change in the external power
897 * supply to the btemp.
898 */
899static void ab8500_btemp_external_power_changed(struct power_supply *psy)
900{
901 struct ab8500_btemp *di = to_ab8500_btemp_device_info(psy);
902
903 class_for_each_device(power_supply_class, NULL,
904 &di->btemp_psy, ab8500_btemp_get_ext_psy_data);
905}
906
907/* ab8500 btemp driver interrupts and their respective isr */
908static struct ab8500_btemp_interrupts ab8500_btemp_irq[] = {
909 {"BAT_CTRL_INDB", ab8500_btemp_batctrlindb_handler},
910 {"BTEMP_LOW", ab8500_btemp_templow_handler},
911 {"BTEMP_HIGH", ab8500_btemp_temphigh_handler},
912 {"BTEMP_LOW_MEDIUM", ab8500_btemp_lowmed_handler},
913 {"BTEMP_MEDIUM_HIGH", ab8500_btemp_medhigh_handler},
914};
915
916#if defined(CONFIG_PM)
917static int ab8500_btemp_resume(struct platform_device *pdev)
918{
919 struct ab8500_btemp *di = platform_get_drvdata(pdev);
920
921 ab8500_btemp_periodic(di, true);
922
923 return 0;
924}
925
926static int ab8500_btemp_suspend(struct platform_device *pdev,
927 pm_message_t state)
928{
929 struct ab8500_btemp *di = platform_get_drvdata(pdev);
930
931 ab8500_btemp_periodic(di, false);
932
933 return 0;
934}
935#else
936#define ab8500_btemp_suspend NULL
937#define ab8500_btemp_resume NULL
938#endif
939
940static int __devexit ab8500_btemp_remove(struct platform_device *pdev)
941{
942 struct ab8500_btemp *di = platform_get_drvdata(pdev);
943 int i, irq;
944
945 /* Disable interrupts */
946 for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
947 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
948 free_irq(irq, di);
949 }
950
951 /* Delete the work queue */
952 destroy_workqueue(di->btemp_wq);
953
954 flush_scheduled_work();
955 power_supply_unregister(&di->btemp_psy);
956 platform_set_drvdata(pdev, NULL);
957 kfree(di);
958
959 return 0;
960}
961
962static int __devinit ab8500_btemp_probe(struct platform_device *pdev)
963{
964 int irq, i, ret = 0;
965 u8 val;
966 struct abx500_bm_plat_data *plat_data;
967
968 struct ab8500_btemp *di =
969 kzalloc(sizeof(struct ab8500_btemp), GFP_KERNEL);
970 if (!di)
971 return -ENOMEM;
972
973 /* get parent data */
974 di->dev = &pdev->dev;
975 di->parent = dev_get_drvdata(pdev->dev.parent);
976 di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
977
978 /* get btemp specific platform data */
979 plat_data = pdev->dev.platform_data;
980 di->pdata = plat_data->btemp;
981 if (!di->pdata) {
982 dev_err(di->dev, "no btemp platform data supplied\n");
983 ret = -EINVAL;
984 goto free_device_info;
985 }
986
987 /* get battery specific platform data */
988 di->bat = plat_data->battery;
989 if (!di->bat) {
990 dev_err(di->dev, "no battery platform data supplied\n");
991 ret = -EINVAL;
992 goto free_device_info;
993 }
994
995 /* BTEMP supply */
996 di->btemp_psy.name = "ab8500_btemp";
997 di->btemp_psy.type = POWER_SUPPLY_TYPE_BATTERY;
998 di->btemp_psy.properties = ab8500_btemp_props;
999 di->btemp_psy.num_properties = ARRAY_SIZE(ab8500_btemp_props);
1000 di->btemp_psy.get_property = ab8500_btemp_get_property;
1001 di->btemp_psy.supplied_to = di->pdata->supplied_to;
1002 di->btemp_psy.num_supplicants = di->pdata->num_supplicants;
1003 di->btemp_psy.external_power_changed =
1004 ab8500_btemp_external_power_changed;
1005
1006
1007 /* Create a work queue for the btemp */
1008 di->btemp_wq =
1009 create_singlethread_workqueue("ab8500_btemp_wq");
1010 if (di->btemp_wq == NULL) {
1011 dev_err(di->dev, "failed to create work queue\n");
1012 goto free_device_info;
1013 }
1014
1015 /* Init work for measuring temperature periodically */
1016 INIT_DELAYED_WORK_DEFERRABLE(&di->btemp_periodic_work,
1017 ab8500_btemp_periodic_work);
1018
1019 /* Identify the battery */
1020 if (ab8500_btemp_id(di) < 0)
1021 dev_warn(di->dev, "failed to identify the battery\n");
1022
1023 /* Set BTEMP thermal limits. Low and Med are fixed */
1024 di->btemp_ranges.btemp_low_limit = BTEMP_THERMAL_LOW_LIMIT;
1025 di->btemp_ranges.btemp_med_limit = BTEMP_THERMAL_MED_LIMIT;
1026
1027 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1028 AB8500_BTEMP_HIGH_TH, &val);
1029 if (ret < 0) {
1030 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1031 goto free_btemp_wq;
1032 }
1033 switch (val) {
1034 case BTEMP_HIGH_TH_57_0:
1035 case BTEMP_HIGH_TH_57_1:
1036 di->btemp_ranges.btemp_high_limit =
1037 BTEMP_THERMAL_HIGH_LIMIT_57;
1038 break;
1039 case BTEMP_HIGH_TH_52:
1040 di->btemp_ranges.btemp_high_limit =
1041 BTEMP_THERMAL_HIGH_LIMIT_52;
1042 break;
1043 case BTEMP_HIGH_TH_62:
1044 di->btemp_ranges.btemp_high_limit =
1045 BTEMP_THERMAL_HIGH_LIMIT_62;
1046 break;
1047 }
1048
1049 /* Register BTEMP power supply class */
1050 ret = power_supply_register(di->dev, &di->btemp_psy);
1051 if (ret) {
1052 dev_err(di->dev, "failed to register BTEMP psy\n");
1053 goto free_btemp_wq;
1054 }
1055
1056 /* Register interrupts */
1057 for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
1058 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1059 ret = request_threaded_irq(irq, NULL, ab8500_btemp_irq[i].isr,
1060 IRQF_SHARED | IRQF_NO_SUSPEND,
1061 ab8500_btemp_irq[i].name, di);
1062
1063 if (ret) {
1064 dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
1065 , ab8500_btemp_irq[i].name, irq, ret);
1066 goto free_irq;
1067 }
1068 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
1069 ab8500_btemp_irq[i].name, irq, ret);
1070 }
1071
1072 platform_set_drvdata(pdev, di);
1073
1074 /* Kick off periodic temperature measurements */
1075 ab8500_btemp_periodic(di, true);
1076 list_add_tail(&di->node, &ab8500_btemp_list);
1077
1078 return ret;
1079
1080free_irq:
1081 power_supply_unregister(&di->btemp_psy);
1082
1083 /* We also have to free all successfully registered irqs */
1084 for (i = i - 1; i >= 0; i--) {
1085 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1086 free_irq(irq, di);
1087 }
1088free_btemp_wq:
1089 destroy_workqueue(di->btemp_wq);
1090free_device_info:
1091 kfree(di);
1092
1093 return ret;
1094}
1095
1096static struct platform_driver ab8500_btemp_driver = {
1097 .probe = ab8500_btemp_probe,
1098 .remove = __devexit_p(ab8500_btemp_remove),
1099 .suspend = ab8500_btemp_suspend,
1100 .resume = ab8500_btemp_resume,
1101 .driver = {
1102 .name = "ab8500-btemp",
1103 .owner = THIS_MODULE,
1104 },
1105};
1106
1107static int __init ab8500_btemp_init(void)
1108{
1109 return platform_driver_register(&ab8500_btemp_driver);
1110}
1111
1112static void __exit ab8500_btemp_exit(void)
1113{
1114 platform_driver_unregister(&ab8500_btemp_driver);
1115}
1116
1117subsys_initcall_sync(ab8500_btemp_init);
1118module_exit(ab8500_btemp_exit);
1119
1120MODULE_LICENSE("GPL v2");
1121MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
1122MODULE_ALIAS("platform:ab8500-btemp");
1123MODULE_DESCRIPTION("AB8500 battery temperature driver");
kernel source for telekom puls (alcatel/mediatek)