1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) ST-Ericsson SA 2012
4 *
5 * Battery temperature driver for AB8500
6 *
7 * Author:
8 * Johan Palsson <johan.palsson@stericsson.com>
9 * Karl Komierowski <karl.komierowski@stericsson.com>
10 * Arun R Murthy <arun.murthy@stericsson.com>
11 */
12
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/device.h>
16 #include <linux/component.h>
17 #include <linux/interrupt.h>
18 #include <linux/delay.h>
19 #include <linux/slab.h>
20 #include <linux/platform_device.h>
21 #include <linux/power_supply.h>
22 #include <linux/completion.h>
23 #include <linux/workqueue.h>
24 #include <linux/jiffies.h>
25 #include <linux/of.h>
26 #include <linux/mfd/core.h>
27 #include <linux/mfd/abx500.h>
28 #include <linux/mfd/abx500/ab8500.h>
29 #include <linux/thermal.h>
30 #include <linux/iio/consumer.h>
31 #include <linux/fixp-arith.h>
32
33 #include "ab8500-bm.h"
34
35 #define BTEMP_THERMAL_LOW_LIMIT -10
36 #define BTEMP_THERMAL_MED_LIMIT 0
37 #define BTEMP_THERMAL_HIGH_LIMIT_52 52
38 #define BTEMP_THERMAL_HIGH_LIMIT_57 57
39 #define BTEMP_THERMAL_HIGH_LIMIT_62 62
40
41 #define BTEMP_BATCTRL_CURR_SRC_7UA 7
42 #define BTEMP_BATCTRL_CURR_SRC_20UA 20
43
44 #define BTEMP_BATCTRL_CURR_SRC_16UA 16
45 #define BTEMP_BATCTRL_CURR_SRC_18UA 18
46
47 #define BTEMP_BATCTRL_CURR_SRC_60UA 60
48 #define BTEMP_BATCTRL_CURR_SRC_120UA 120
49
50 /**
51 * struct ab8500_btemp_interrupts - ab8500 interrupts
52 * @name: name of the interrupt
53 * @isr function pointer to the isr
54 */
55 struct ab8500_btemp_interrupts {
56 char *name;
57 irqreturn_t (*isr)(int irq, void *data);
58 };
59
60 struct ab8500_btemp_events {
61 bool batt_rem;
62 bool btemp_high;
63 bool btemp_medhigh;
64 bool btemp_lowmed;
65 bool btemp_low;
66 bool ac_conn;
67 bool usb_conn;
68 };
69
70 struct ab8500_btemp_ranges {
71 int btemp_high_limit;
72 int btemp_med_limit;
73 int btemp_low_limit;
74 };
75
76 /**
77 * struct ab8500_btemp - ab8500 BTEMP device information
78 * @dev: Pointer to the structure device
79 * @node: List of AB8500 BTEMPs, hence prepared for reentrance
80 * @curr_source: What current source we use, in uA
81 * @bat_temp: Dispatched battery temperature in degree Celsius
82 * @prev_bat_temp Last measured battery temperature in degree Celsius
83 * @parent: Pointer to the struct ab8500
84 * @tz: Thermal zone for the battery
85 * @adc_bat_ctrl: ADC channel for the battery control
86 * @fg: Pointer to the struct fg
87 * @bm: Platform specific battery management information
88 * @btemp_psy: Structure for BTEMP specific battery properties
89 * @events: Structure for information about events triggered
90 * @btemp_ranges: Battery temperature range structure
91 * @btemp_wq: Work queue for measuring the temperature periodically
92 * @btemp_periodic_work: Work for measuring the temperature periodically
93 * @initialized: True if battery id read.
94 */
95 struct ab8500_btemp {
96 struct device *dev;
97 struct list_head node;
98 int curr_source;
99 int bat_temp;
100 int prev_bat_temp;
101 struct ab8500 *parent;
102 struct thermal_zone_device *tz;
103 struct iio_channel *bat_ctrl;
104 struct ab8500_fg *fg;
105 struct ab8500_bm_data *bm;
106 struct power_supply *btemp_psy;
107 struct ab8500_btemp_events events;
108 struct ab8500_btemp_ranges btemp_ranges;
109 struct workqueue_struct *btemp_wq;
110 struct delayed_work btemp_periodic_work;
111 bool initialized;
112 };
113
114 /* BTEMP power supply properties */
115 static enum power_supply_property ab8500_btemp_props[] = {
116 POWER_SUPPLY_PROP_PRESENT,
117 POWER_SUPPLY_PROP_ONLINE,
118 POWER_SUPPLY_PROP_TEMP,
119 };
120
121 static LIST_HEAD(ab8500_btemp_list);
122
123 /**
124 * ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance
125 * @di: pointer to the ab8500_btemp structure
126 * @v_batctrl: measured batctrl voltage
127 * @inst_curr: measured instant current
128 *
129 * This function returns the battery resistance that is
130 * derived from the BATCTRL voltage.
131 * Returns value in Ohms.
132 */
ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp * di,int v_batctrl,int inst_curr)133 static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di,
134 int v_batctrl, int inst_curr)
135 {
136 if (is_ab8500_1p1_or_earlier(di->parent)) {
137 /*
138 * For ABB cut1.0 and 1.1 BAT_CTRL is internally
139 * connected to 1.8V through a 450k resistor
140 */
141 return (450000 * (v_batctrl)) / (1800 - v_batctrl);
142 }
143
144 /*
145 * BAT_CTRL is internally
146 * connected to 1.8V through a 80k resistor
147 */
148 return (80000 * (v_batctrl)) / (1800 - v_batctrl);
149 }
150
151 /**
152 * ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage
153 * @di: pointer to the ab8500_btemp structure
154 *
155 * This function returns the voltage on BATCTRL. Returns value in mV.
156 */
ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp * di)157 static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp *di)
158 {
159 int vbtemp, ret;
160 static int prev;
161
162 ret = iio_read_channel_processed(di->bat_ctrl, &vbtemp);
163 if (ret < 0) {
164 dev_err(di->dev,
165 "%s ADC conversion failed, using previous value",
166 __func__);
167 return prev;
168 }
169 prev = vbtemp;
170 return vbtemp;
171 }
172
173 /**
174 * ab8500_btemp_get_batctrl_res() - get battery resistance
175 * @di: pointer to the ab8500_btemp structure
176 *
177 * This function returns the battery pack identification resistance.
178 * Returns value in Ohms.
179 */
ab8500_btemp_get_batctrl_res(struct ab8500_btemp * di)180 static int ab8500_btemp_get_batctrl_res(struct ab8500_btemp *di)
181 {
182 int ret;
183 int batctrl = 0;
184 int res;
185 int inst_curr;
186 int i;
187
188 if (!di->fg)
189 di->fg = ab8500_fg_get();
190 if (!di->fg) {
191 dev_err(di->dev, "No fg found\n");
192 return -EINVAL;
193 }
194
195 ret = ab8500_fg_inst_curr_start(di->fg);
196
197 if (ret) {
198 dev_err(di->dev, "Failed to start current measurement\n");
199 return ret;
200 }
201
202 do {
203 msleep(20);
204 } while (!ab8500_fg_inst_curr_started(di->fg));
205
206 i = 0;
207
208 do {
209 batctrl += ab8500_btemp_read_batctrl_voltage(di);
210 i++;
211 msleep(20);
212 } while (!ab8500_fg_inst_curr_done(di->fg));
213 batctrl /= i;
214
215 ret = ab8500_fg_inst_curr_finalize(di->fg, &inst_curr);
216 if (ret) {
217 dev_err(di->dev, "Failed to finalize current measurement\n");
218 return ret;
219 }
220
221 res = ab8500_btemp_batctrl_volt_to_res(di, batctrl, inst_curr);
222
223 dev_dbg(di->dev, "%s batctrl: %d res: %d inst_curr: %d samples: %d\n",
224 __func__, batctrl, res, inst_curr, i);
225
226 return res;
227 }
228
229 /**
230 * ab8500_btemp_id() - Identify the connected battery
231 * @di: pointer to the ab8500_btemp structure
232 *
233 * This function will try to identify the battery by reading the ID
234 * resistor. Some brands use a combined ID resistor with a NTC resistor to
235 * both be able to identify and to read the temperature of it.
236 */
ab8500_btemp_id(struct ab8500_btemp * di)237 static int ab8500_btemp_id(struct ab8500_btemp *di)
238 {
239 struct power_supply_battery_info *bi = di->bm->bi;
240 int res;
241
242 di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA;
243
244 res = ab8500_btemp_get_batctrl_res(di);
245 if (res < 0) {
246 dev_err(di->dev, "%s get batctrl res failed\n", __func__);
247 return -ENXIO;
248 }
249
250 if (power_supply_battery_bti_in_range(bi, res)) {
251 dev_info(di->dev, "Battery detected on BATCTRL (pin C3)"
252 " resistance %d Ohm = %d Ohm +/- %d%%\n",
253 res, bi->bti_resistance_ohm,
254 bi->bti_resistance_tolerance);
255 } else {
256 dev_warn(di->dev, "Battery identified as unknown"
257 ", resistance %d Ohm\n", res);
258 return -ENXIO;
259 }
260
261 return 0;
262 }
263
264 /**
265 * ab8500_btemp_periodic_work() - Measuring the temperature periodically
266 * @work: pointer to the work_struct structure
267 *
268 * Work function for measuring the temperature periodically
269 */
ab8500_btemp_periodic_work(struct work_struct * work)270 static void ab8500_btemp_periodic_work(struct work_struct *work)
271 {
272 int interval;
273 int bat_temp;
274 struct ab8500_btemp *di = container_of(work,
275 struct ab8500_btemp, btemp_periodic_work.work);
276 /* Assume 25 degrees celsius as start temperature */
277 static int prev = 25;
278 int ret;
279
280 if (!di->initialized) {
281 /* Identify the battery */
282 if (ab8500_btemp_id(di) < 0)
283 dev_warn(di->dev, "failed to identify the battery\n");
284 }
285
286 /* Failover if a reading is erroneous, use last meausurement */
287 ret = thermal_zone_get_temp(di->tz, &bat_temp);
288 if (ret) {
289 dev_err(di->dev, "error reading temperature\n");
290 bat_temp = prev;
291 } else {
292 /* Convert from millicentigrades to centigrades */
293 bat_temp /= 1000;
294 prev = bat_temp;
295 }
296
297 /*
298 * Filter battery temperature.
299 * Allow direct updates on temperature only if two samples result in
300 * same temperature. Else only allow 1 degree change from previous
301 * reported value in the direction of the new measurement.
302 */
303 if ((bat_temp == di->prev_bat_temp) || !di->initialized) {
304 if ((di->bat_temp != di->prev_bat_temp) || !di->initialized) {
305 di->initialized = true;
306 di->bat_temp = bat_temp;
307 power_supply_changed(di->btemp_psy);
308 }
309 } else if (bat_temp < di->prev_bat_temp) {
310 di->bat_temp--;
311 power_supply_changed(di->btemp_psy);
312 } else if (bat_temp > di->prev_bat_temp) {
313 di->bat_temp++;
314 power_supply_changed(di->btemp_psy);
315 }
316 di->prev_bat_temp = bat_temp;
317
318 if (di->events.ac_conn || di->events.usb_conn)
319 interval = di->bm->temp_interval_chg;
320 else
321 interval = di->bm->temp_interval_nochg;
322
323 /* Schedule a new measurement */
324 queue_delayed_work(di->btemp_wq,
325 &di->btemp_periodic_work,
326 round_jiffies(interval * HZ));
327 }
328
329 /**
330 * ab8500_btemp_batctrlindb_handler() - battery removal detected
331 * @irq: interrupt number
332 * @_di: void pointer that has to address of ab8500_btemp
333 *
334 * Returns IRQ status(IRQ_HANDLED)
335 */
ab8500_btemp_batctrlindb_handler(int irq,void * _di)336 static irqreturn_t ab8500_btemp_batctrlindb_handler(int irq, void *_di)
337 {
338 struct ab8500_btemp *di = _di;
339 dev_err(di->dev, "Battery removal detected!\n");
340
341 di->events.batt_rem = true;
342 power_supply_changed(di->btemp_psy);
343
344 return IRQ_HANDLED;
345 }
346
347 /**
348 * ab8500_btemp_templow_handler() - battery temp lower than 10 degrees
349 * @irq: interrupt number
350 * @_di: void pointer that has to address of ab8500_btemp
351 *
352 * Returns IRQ status(IRQ_HANDLED)
353 */
ab8500_btemp_templow_handler(int irq,void * _di)354 static irqreturn_t ab8500_btemp_templow_handler(int irq, void *_di)
355 {
356 struct ab8500_btemp *di = _di;
357
358 if (is_ab8500_3p3_or_earlier(di->parent)) {
359 dev_dbg(di->dev, "Ignore false btemp low irq"
360 " for ABB cut 1.0, 1.1, 2.0 and 3.3\n");
361 } else {
362 dev_crit(di->dev, "Battery temperature lower than -10deg c\n");
363
364 di->events.btemp_low = true;
365 di->events.btemp_high = false;
366 di->events.btemp_medhigh = false;
367 di->events.btemp_lowmed = false;
368 power_supply_changed(di->btemp_psy);
369 }
370
371 return IRQ_HANDLED;
372 }
373
374 /**
375 * ab8500_btemp_temphigh_handler() - battery temp higher than max temp
376 * @irq: interrupt number
377 * @_di: void pointer that has to address of ab8500_btemp
378 *
379 * Returns IRQ status(IRQ_HANDLED)
380 */
ab8500_btemp_temphigh_handler(int irq,void * _di)381 static irqreturn_t ab8500_btemp_temphigh_handler(int irq, void *_di)
382 {
383 struct ab8500_btemp *di = _di;
384
385 dev_crit(di->dev, "Battery temperature is higher than MAX temp\n");
386
387 di->events.btemp_high = true;
388 di->events.btemp_medhigh = false;
389 di->events.btemp_lowmed = false;
390 di->events.btemp_low = false;
391 power_supply_changed(di->btemp_psy);
392
393 return IRQ_HANDLED;
394 }
395
396 /**
397 * ab8500_btemp_lowmed_handler() - battery temp between low and medium
398 * @irq: interrupt number
399 * @_di: void pointer that has to address of ab8500_btemp
400 *
401 * Returns IRQ status(IRQ_HANDLED)
402 */
ab8500_btemp_lowmed_handler(int irq,void * _di)403 static irqreturn_t ab8500_btemp_lowmed_handler(int irq, void *_di)
404 {
405 struct ab8500_btemp *di = _di;
406
407 dev_dbg(di->dev, "Battery temperature is between low and medium\n");
408
409 di->events.btemp_lowmed = true;
410 di->events.btemp_medhigh = false;
411 di->events.btemp_high = false;
412 di->events.btemp_low = false;
413 power_supply_changed(di->btemp_psy);
414
415 return IRQ_HANDLED;
416 }
417
418 /**
419 * ab8500_btemp_medhigh_handler() - battery temp between medium and high
420 * @irq: interrupt number
421 * @_di: void pointer that has to address of ab8500_btemp
422 *
423 * Returns IRQ status(IRQ_HANDLED)
424 */
ab8500_btemp_medhigh_handler(int irq,void * _di)425 static irqreturn_t ab8500_btemp_medhigh_handler(int irq, void *_di)
426 {
427 struct ab8500_btemp *di = _di;
428
429 dev_dbg(di->dev, "Battery temperature is between medium and high\n");
430
431 di->events.btemp_medhigh = true;
432 di->events.btemp_lowmed = false;
433 di->events.btemp_high = false;
434 di->events.btemp_low = false;
435 power_supply_changed(di->btemp_psy);
436
437 return IRQ_HANDLED;
438 }
439
440 /**
441 * ab8500_btemp_periodic() - Periodic temperature measurements
442 * @di: pointer to the ab8500_btemp structure
443 * @enable: enable or disable periodic temperature measurements
444 *
445 * Starts of stops periodic temperature measurements. Periodic measurements
446 * should only be done when a charger is connected.
447 */
ab8500_btemp_periodic(struct ab8500_btemp * di,bool enable)448 static void ab8500_btemp_periodic(struct ab8500_btemp *di,
449 bool enable)
450 {
451 dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n",
452 enable);
453 /*
454 * Make sure a new measurement is done directly by cancelling
455 * any pending work
456 */
457 cancel_delayed_work_sync(&di->btemp_periodic_work);
458
459 if (enable)
460 queue_delayed_work(di->btemp_wq, &di->btemp_periodic_work, 0);
461 }
462
463 /**
464 * ab8500_btemp_get_temp() - get battery temperature
465 * @di: pointer to the ab8500_btemp structure
466 *
467 * Returns battery temperature
468 */
ab8500_btemp_get_temp(struct ab8500_btemp * di)469 static int ab8500_btemp_get_temp(struct ab8500_btemp *di)
470 {
471 int temp = 0;
472
473 /*
474 * The BTEMP events are not reliabe on AB8500 cut3.3
475 * and prior versions
476 */
477 if (is_ab8500_3p3_or_earlier(di->parent)) {
478 temp = di->bat_temp * 10;
479 } else {
480 if (di->events.btemp_low) {
481 if (temp > di->btemp_ranges.btemp_low_limit)
482 temp = di->btemp_ranges.btemp_low_limit * 10;
483 else
484 temp = di->bat_temp * 10;
485 } else if (di->events.btemp_high) {
486 if (temp < di->btemp_ranges.btemp_high_limit)
487 temp = di->btemp_ranges.btemp_high_limit * 10;
488 else
489 temp = di->bat_temp * 10;
490 } else if (di->events.btemp_lowmed) {
491 if (temp > di->btemp_ranges.btemp_med_limit)
492 temp = di->btemp_ranges.btemp_med_limit * 10;
493 else
494 temp = di->bat_temp * 10;
495 } else if (di->events.btemp_medhigh) {
496 if (temp < di->btemp_ranges.btemp_med_limit)
497 temp = di->btemp_ranges.btemp_med_limit * 10;
498 else
499 temp = di->bat_temp * 10;
500 } else
501 temp = di->bat_temp * 10;
502 }
503 return temp;
504 }
505
506 /**
507 * ab8500_btemp_get_property() - get the btemp properties
508 * @psy: pointer to the power_supply structure
509 * @psp: pointer to the power_supply_property structure
510 * @val: pointer to the power_supply_propval union
511 *
512 * This function gets called when an application tries to get the btemp
513 * properties by reading the sysfs files.
514 * online: presence of the battery
515 * present: presence of the battery
516 * technology: battery technology
517 * temp: battery temperature
518 * Returns error code in case of failure else 0(on success)
519 */
ab8500_btemp_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)520 static int ab8500_btemp_get_property(struct power_supply *psy,
521 enum power_supply_property psp,
522 union power_supply_propval *val)
523 {
524 struct ab8500_btemp *di = power_supply_get_drvdata(psy);
525
526 switch (psp) {
527 case POWER_SUPPLY_PROP_PRESENT:
528 case POWER_SUPPLY_PROP_ONLINE:
529 if (di->events.batt_rem)
530 val->intval = 0;
531 else
532 val->intval = 1;
533 break;
534 case POWER_SUPPLY_PROP_TEMP:
535 val->intval = ab8500_btemp_get_temp(di);
536 break;
537 default:
538 return -EINVAL;
539 }
540 return 0;
541 }
542
ab8500_btemp_get_ext_psy_data(struct device * dev,void * data)543 static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data)
544 {
545 struct power_supply *psy;
546 struct power_supply *ext = dev_get_drvdata(dev);
547 const char **supplicants = (const char **)ext->supplied_to;
548 struct ab8500_btemp *di;
549 union power_supply_propval ret;
550 int j;
551
552 psy = (struct power_supply *)data;
553 di = power_supply_get_drvdata(psy);
554
555 /*
556 * For all psy where the name of your driver
557 * appears in any supplied_to
558 */
559 j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
560 if (j < 0)
561 return 0;
562
563 /* Go through all properties for the psy */
564 for (j = 0; j < ext->desc->num_properties; j++) {
565 enum power_supply_property prop;
566 prop = ext->desc->properties[j];
567
568 if (power_supply_get_property(ext, prop, &ret))
569 continue;
570
571 switch (prop) {
572 case POWER_SUPPLY_PROP_PRESENT:
573 switch (ext->desc->type) {
574 case POWER_SUPPLY_TYPE_MAINS:
575 /* AC disconnected */
576 if (!ret.intval && di->events.ac_conn) {
577 di->events.ac_conn = false;
578 }
579 /* AC connected */
580 else if (ret.intval && !di->events.ac_conn) {
581 di->events.ac_conn = true;
582 if (!di->events.usb_conn)
583 ab8500_btemp_periodic(di, true);
584 }
585 break;
586 case POWER_SUPPLY_TYPE_USB:
587 /* USB disconnected */
588 if (!ret.intval && di->events.usb_conn) {
589 di->events.usb_conn = false;
590 }
591 /* USB connected */
592 else if (ret.intval && !di->events.usb_conn) {
593 di->events.usb_conn = true;
594 if (!di->events.ac_conn)
595 ab8500_btemp_periodic(di, true);
596 }
597 break;
598 default:
599 break;
600 }
601 break;
602 default:
603 break;
604 }
605 }
606 return 0;
607 }
608
609 /**
610 * ab8500_btemp_external_power_changed() - callback for power supply changes
611 * @psy: pointer to the structure power_supply
612 *
613 * This function is pointing to the function pointer external_power_changed
614 * of the structure power_supply.
615 * This function gets executed when there is a change in the external power
616 * supply to the btemp.
617 */
ab8500_btemp_external_power_changed(struct power_supply * psy)618 static void ab8500_btemp_external_power_changed(struct power_supply *psy)
619 {
620 class_for_each_device(power_supply_class, NULL, psy,
621 ab8500_btemp_get_ext_psy_data);
622 }
623
624 /* ab8500 btemp driver interrupts and their respective isr */
625 static struct ab8500_btemp_interrupts ab8500_btemp_irq[] = {
626 {"BAT_CTRL_INDB", ab8500_btemp_batctrlindb_handler},
627 {"BTEMP_LOW", ab8500_btemp_templow_handler},
628 {"BTEMP_HIGH", ab8500_btemp_temphigh_handler},
629 {"BTEMP_LOW_MEDIUM", ab8500_btemp_lowmed_handler},
630 {"BTEMP_MEDIUM_HIGH", ab8500_btemp_medhigh_handler},
631 };
632
ab8500_btemp_resume(struct device * dev)633 static int __maybe_unused ab8500_btemp_resume(struct device *dev)
634 {
635 struct ab8500_btemp *di = dev_get_drvdata(dev);
636
637 ab8500_btemp_periodic(di, true);
638
639 return 0;
640 }
641
ab8500_btemp_suspend(struct device * dev)642 static int __maybe_unused ab8500_btemp_suspend(struct device *dev)
643 {
644 struct ab8500_btemp *di = dev_get_drvdata(dev);
645
646 ab8500_btemp_periodic(di, false);
647
648 return 0;
649 }
650
651 static char *supply_interface[] = {
652 "ab8500_chargalg",
653 "ab8500_fg",
654 };
655
656 static const struct power_supply_desc ab8500_btemp_desc = {
657 .name = "ab8500_btemp",
658 .type = POWER_SUPPLY_TYPE_UNKNOWN,
659 .properties = ab8500_btemp_props,
660 .num_properties = ARRAY_SIZE(ab8500_btemp_props),
661 .get_property = ab8500_btemp_get_property,
662 .external_power_changed = ab8500_btemp_external_power_changed,
663 };
664
ab8500_btemp_bind(struct device * dev,struct device * master,void * data)665 static int ab8500_btemp_bind(struct device *dev, struct device *master,
666 void *data)
667 {
668 struct ab8500_btemp *di = dev_get_drvdata(dev);
669
670 /* Create a work queue for the btemp */
671 di->btemp_wq =
672 alloc_workqueue("ab8500_btemp_wq", WQ_MEM_RECLAIM, 0);
673 if (di->btemp_wq == NULL) {
674 dev_err(dev, "failed to create work queue\n");
675 return -ENOMEM;
676 }
677
678 /* Kick off periodic temperature measurements */
679 ab8500_btemp_periodic(di, true);
680
681 return 0;
682 }
683
ab8500_btemp_unbind(struct device * dev,struct device * master,void * data)684 static void ab8500_btemp_unbind(struct device *dev, struct device *master,
685 void *data)
686 {
687 struct ab8500_btemp *di = dev_get_drvdata(dev);
688
689 /* Delete the work queue */
690 destroy_workqueue(di->btemp_wq);
691 }
692
693 static const struct component_ops ab8500_btemp_component_ops = {
694 .bind = ab8500_btemp_bind,
695 .unbind = ab8500_btemp_unbind,
696 };
697
ab8500_btemp_probe(struct platform_device * pdev)698 static int ab8500_btemp_probe(struct platform_device *pdev)
699 {
700 struct power_supply_config psy_cfg = {};
701 struct device *dev = &pdev->dev;
702 struct ab8500_btemp *di;
703 int irq, i, ret = 0;
704 u8 val;
705
706 di = devm_kzalloc(dev, sizeof(*di), GFP_KERNEL);
707 if (!di)
708 return -ENOMEM;
709
710 di->bm = &ab8500_bm_data;
711
712 /* get parent data */
713 di->dev = dev;
714 di->parent = dev_get_drvdata(pdev->dev.parent);
715
716 /* Get thermal zone and ADC */
717 di->tz = thermal_zone_get_zone_by_name("battery-thermal");
718 if (IS_ERR(di->tz)) {
719 ret = PTR_ERR(di->tz);
720 /*
721 * This usually just means we are probing before the thermal
722 * zone, so just defer.
723 */
724 if (ret == -ENODEV)
725 ret = -EPROBE_DEFER;
726 return dev_err_probe(dev, ret,
727 "failed to get battery thermal zone\n");
728 }
729 di->bat_ctrl = devm_iio_channel_get(dev, "bat_ctrl");
730 if (IS_ERR(di->bat_ctrl)) {
731 ret = dev_err_probe(dev, PTR_ERR(di->bat_ctrl),
732 "failed to get BAT CTRL ADC channel\n");
733 return ret;
734 }
735
736 di->initialized = false;
737
738 psy_cfg.supplied_to = supply_interface;
739 psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
740 psy_cfg.drv_data = di;
741
742 /* Init work for measuring temperature periodically */
743 INIT_DEFERRABLE_WORK(&di->btemp_periodic_work,
744 ab8500_btemp_periodic_work);
745
746 /* Set BTEMP thermal limits. Low and Med are fixed */
747 di->btemp_ranges.btemp_low_limit = BTEMP_THERMAL_LOW_LIMIT;
748 di->btemp_ranges.btemp_med_limit = BTEMP_THERMAL_MED_LIMIT;
749
750 ret = abx500_get_register_interruptible(dev, AB8500_CHARGER,
751 AB8500_BTEMP_HIGH_TH, &val);
752 if (ret < 0) {
753 dev_err(dev, "%s ab8500 read failed\n", __func__);
754 return ret;
755 }
756 switch (val) {
757 case BTEMP_HIGH_TH_57_0:
758 case BTEMP_HIGH_TH_57_1:
759 di->btemp_ranges.btemp_high_limit =
760 BTEMP_THERMAL_HIGH_LIMIT_57;
761 break;
762 case BTEMP_HIGH_TH_52:
763 di->btemp_ranges.btemp_high_limit =
764 BTEMP_THERMAL_HIGH_LIMIT_52;
765 break;
766 case BTEMP_HIGH_TH_62:
767 di->btemp_ranges.btemp_high_limit =
768 BTEMP_THERMAL_HIGH_LIMIT_62;
769 break;
770 }
771
772 /* Register BTEMP power supply class */
773 di->btemp_psy = devm_power_supply_register(dev, &ab8500_btemp_desc,
774 &psy_cfg);
775 if (IS_ERR(di->btemp_psy)) {
776 dev_err(dev, "failed to register BTEMP psy\n");
777 return PTR_ERR(di->btemp_psy);
778 }
779
780 /* Register interrupts */
781 for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
782 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
783 if (irq < 0)
784 return irq;
785
786 ret = devm_request_threaded_irq(dev, irq, NULL,
787 ab8500_btemp_irq[i].isr,
788 IRQF_SHARED | IRQF_NO_SUSPEND | IRQF_ONESHOT,
789 ab8500_btemp_irq[i].name, di);
790
791 if (ret) {
792 dev_err(dev, "failed to request %s IRQ %d: %d\n"
793 , ab8500_btemp_irq[i].name, irq, ret);
794 return ret;
795 }
796 dev_dbg(dev, "Requested %s IRQ %d: %d\n",
797 ab8500_btemp_irq[i].name, irq, ret);
798 }
799
800 platform_set_drvdata(pdev, di);
801
802 list_add_tail(&di->node, &ab8500_btemp_list);
803
804 return component_add(dev, &ab8500_btemp_component_ops);
805 }
806
ab8500_btemp_remove(struct platform_device * pdev)807 static int ab8500_btemp_remove(struct platform_device *pdev)
808 {
809 component_del(&pdev->dev, &ab8500_btemp_component_ops);
810
811 return 0;
812 }
813
814 static SIMPLE_DEV_PM_OPS(ab8500_btemp_pm_ops, ab8500_btemp_suspend, ab8500_btemp_resume);
815
816 static const struct of_device_id ab8500_btemp_match[] = {
817 { .compatible = "stericsson,ab8500-btemp", },
818 { },
819 };
820 MODULE_DEVICE_TABLE(of, ab8500_btemp_match);
821
822 struct platform_driver ab8500_btemp_driver = {
823 .probe = ab8500_btemp_probe,
824 .remove = ab8500_btemp_remove,
825 .driver = {
826 .name = "ab8500-btemp",
827 .of_match_table = ab8500_btemp_match,
828 .pm = &ab8500_btemp_pm_ops,
829 },
830 };
831 MODULE_LICENSE("GPL v2");
832 MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
833 MODULE_ALIAS("platform:ab8500-btemp");
834 MODULE_DESCRIPTION("AB8500 battery temperature driver");
835