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_TECHNOLOGY,
119 POWER_SUPPLY_PROP_TEMP,
120 };
121
122 static LIST_HEAD(ab8500_btemp_list);
123
124 /**
125 * ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance
126 * @di: pointer to the ab8500_btemp structure
127 * @v_batctrl: measured batctrl voltage
128 * @inst_curr: measured instant current
129 *
130 * This function returns the battery resistance that is
131 * derived from the BATCTRL voltage.
132 * Returns value in Ohms.
133 */
ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp * di,int v_batctrl,int inst_curr)134 static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di,
135 int v_batctrl, int inst_curr)
136 {
137 if (is_ab8500_1p1_or_earlier(di->parent)) {
138 /*
139 * For ABB cut1.0 and 1.1 BAT_CTRL is internally
140 * connected to 1.8V through a 450k resistor
141 */
142 return (450000 * (v_batctrl)) / (1800 - v_batctrl);
143 }
144
145 /*
146 * BAT_CTRL is internally
147 * connected to 1.8V through a 80k resistor
148 */
149 return (80000 * (v_batctrl)) / (1800 - v_batctrl);
150 }
151
152 /**
153 * ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage
154 * @di: pointer to the ab8500_btemp structure
155 *
156 * This function returns the voltage on BATCTRL. Returns value in mV.
157 */
ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp * di)158 static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp *di)
159 {
160 int vbtemp, ret;
161 static int prev;
162
163 ret = iio_read_channel_processed(di->bat_ctrl, &vbtemp);
164 if (ret < 0) {
165 dev_err(di->dev,
166 "%s ADC conversion failed, using previous value",
167 __func__);
168 return prev;
169 }
170 prev = vbtemp;
171 return vbtemp;
172 }
173
174 /**
175 * ab8500_btemp_get_batctrl_res() - get battery resistance
176 * @di: pointer to the ab8500_btemp structure
177 *
178 * This function returns the battery pack identification resistance.
179 * Returns value in Ohms.
180 */
ab8500_btemp_get_batctrl_res(struct ab8500_btemp * di)181 static int ab8500_btemp_get_batctrl_res(struct ab8500_btemp *di)
182 {
183 int ret;
184 int batctrl = 0;
185 int res;
186 int inst_curr;
187 int i;
188
189 if (!di->fg)
190 di->fg = ab8500_fg_get();
191 if (!di->fg) {
192 dev_err(di->dev, "No fg found\n");
193 return -EINVAL;
194 }
195
196 ret = ab8500_fg_inst_curr_start(di->fg);
197
198 if (ret) {
199 dev_err(di->dev, "Failed to start current measurement\n");
200 return ret;
201 }
202
203 do {
204 msleep(20);
205 } while (!ab8500_fg_inst_curr_started(di->fg));
206
207 i = 0;
208
209 do {
210 batctrl += ab8500_btemp_read_batctrl_voltage(di);
211 i++;
212 msleep(20);
213 } while (!ab8500_fg_inst_curr_done(di->fg));
214 batctrl /= i;
215
216 ret = ab8500_fg_inst_curr_finalize(di->fg, &inst_curr);
217 if (ret) {
218 dev_err(di->dev, "Failed to finalize current measurement\n");
219 return ret;
220 }
221
222 res = ab8500_btemp_batctrl_volt_to_res(di, batctrl, inst_curr);
223
224 dev_dbg(di->dev, "%s batctrl: %d res: %d inst_curr: %d samples: %d\n",
225 __func__, batctrl, res, inst_curr, i);
226
227 return res;
228 }
229
230 /**
231 * ab8500_btemp_id() - Identify the connected battery
232 * @di: pointer to the ab8500_btemp structure
233 *
234 * This function will try to identify the battery by reading the ID
235 * resistor. Some brands use a combined ID resistor with a NTC resistor to
236 * both be able to identify and to read the temperature of it.
237 */
ab8500_btemp_id(struct ab8500_btemp * di)238 static int ab8500_btemp_id(struct ab8500_btemp *di)
239 {
240 struct power_supply_battery_info *bi = di->bm->bi;
241 int res;
242
243 di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA;
244
245 res = ab8500_btemp_get_batctrl_res(di);
246 if (res < 0) {
247 dev_err(di->dev, "%s get batctrl res failed\n", __func__);
248 return -ENXIO;
249 }
250
251 if (power_supply_battery_bti_in_range(bi, res)) {
252 dev_info(di->dev, "Battery detected on BATCTRL (pin C3)"
253 " resistance %d Ohm = %d Ohm +/- %d%%\n",
254 res, bi->bti_resistance_ohm,
255 bi->bti_resistance_tolerance);
256 } else {
257 dev_warn(di->dev, "Battery identified as unknown"
258 ", resistance %d Ohm\n", res);
259 return -ENXIO;
260 }
261
262 return 0;
263 }
264
265 /**
266 * ab8500_btemp_periodic_work() - Measuring the temperature periodically
267 * @work: pointer to the work_struct structure
268 *
269 * Work function for measuring the temperature periodically
270 */
ab8500_btemp_periodic_work(struct work_struct * work)271 static void ab8500_btemp_periodic_work(struct work_struct *work)
272 {
273 int interval;
274 int bat_temp;
275 struct ab8500_btemp *di = container_of(work,
276 struct ab8500_btemp, btemp_periodic_work.work);
277 /* Assume 25 degrees celsius as start temperature */
278 static int prev = 25;
279 int ret;
280
281 if (!di->initialized) {
282 /* Identify the battery */
283 if (ab8500_btemp_id(di) < 0)
284 dev_warn(di->dev, "failed to identify the battery\n");
285 }
286
287 /* Failover if a reading is erroneous, use last meausurement */
288 ret = thermal_zone_get_temp(di->tz, &bat_temp);
289 if (ret) {
290 dev_err(di->dev, "error reading temperature\n");
291 bat_temp = prev;
292 } else {
293 /* Convert from millicentigrades to centigrades */
294 bat_temp /= 1000;
295 prev = bat_temp;
296 }
297
298 /*
299 * Filter battery temperature.
300 * Allow direct updates on temperature only if two samples result in
301 * same temperature. Else only allow 1 degree change from previous
302 * reported value in the direction of the new measurement.
303 */
304 if ((bat_temp == di->prev_bat_temp) || !di->initialized) {
305 if ((di->bat_temp != di->prev_bat_temp) || !di->initialized) {
306 di->initialized = true;
307 di->bat_temp = bat_temp;
308 power_supply_changed(di->btemp_psy);
309 }
310 } else if (bat_temp < di->prev_bat_temp) {
311 di->bat_temp--;
312 power_supply_changed(di->btemp_psy);
313 } else if (bat_temp > di->prev_bat_temp) {
314 di->bat_temp++;
315 power_supply_changed(di->btemp_psy);
316 }
317 di->prev_bat_temp = bat_temp;
318
319 if (di->events.ac_conn || di->events.usb_conn)
320 interval = di->bm->temp_interval_chg;
321 else
322 interval = di->bm->temp_interval_nochg;
323
324 /* Schedule a new measurement */
325 queue_delayed_work(di->btemp_wq,
326 &di->btemp_periodic_work,
327 round_jiffies(interval * HZ));
328 }
329
330 /**
331 * ab8500_btemp_batctrlindb_handler() - battery removal detected
332 * @irq: interrupt number
333 * @_di: void pointer that has to address of ab8500_btemp
334 *
335 * Returns IRQ status(IRQ_HANDLED)
336 */
ab8500_btemp_batctrlindb_handler(int irq,void * _di)337 static irqreturn_t ab8500_btemp_batctrlindb_handler(int irq, void *_di)
338 {
339 struct ab8500_btemp *di = _di;
340 dev_err(di->dev, "Battery removal detected!\n");
341
342 di->events.batt_rem = true;
343 power_supply_changed(di->btemp_psy);
344
345 return IRQ_HANDLED;
346 }
347
348 /**
349 * ab8500_btemp_templow_handler() - battery temp lower than 10 degrees
350 * @irq: interrupt number
351 * @_di: void pointer that has to address of ab8500_btemp
352 *
353 * Returns IRQ status(IRQ_HANDLED)
354 */
ab8500_btemp_templow_handler(int irq,void * _di)355 static irqreturn_t ab8500_btemp_templow_handler(int irq, void *_di)
356 {
357 struct ab8500_btemp *di = _di;
358
359 if (is_ab8500_3p3_or_earlier(di->parent)) {
360 dev_dbg(di->dev, "Ignore false btemp low irq"
361 " for ABB cut 1.0, 1.1, 2.0 and 3.3\n");
362 } else {
363 dev_crit(di->dev, "Battery temperature lower than -10deg c\n");
364
365 di->events.btemp_low = true;
366 di->events.btemp_high = false;
367 di->events.btemp_medhigh = false;
368 di->events.btemp_lowmed = false;
369 power_supply_changed(di->btemp_psy);
370 }
371
372 return IRQ_HANDLED;
373 }
374
375 /**
376 * ab8500_btemp_temphigh_handler() - battery temp higher than max temp
377 * @irq: interrupt number
378 * @_di: void pointer that has to address of ab8500_btemp
379 *
380 * Returns IRQ status(IRQ_HANDLED)
381 */
ab8500_btemp_temphigh_handler(int irq,void * _di)382 static irqreturn_t ab8500_btemp_temphigh_handler(int irq, void *_di)
383 {
384 struct ab8500_btemp *di = _di;
385
386 dev_crit(di->dev, "Battery temperature is higher than MAX temp\n");
387
388 di->events.btemp_high = true;
389 di->events.btemp_medhigh = false;
390 di->events.btemp_lowmed = false;
391 di->events.btemp_low = false;
392 power_supply_changed(di->btemp_psy);
393
394 return IRQ_HANDLED;
395 }
396
397 /**
398 * ab8500_btemp_lowmed_handler() - battery temp between low and medium
399 * @irq: interrupt number
400 * @_di: void pointer that has to address of ab8500_btemp
401 *
402 * Returns IRQ status(IRQ_HANDLED)
403 */
ab8500_btemp_lowmed_handler(int irq,void * _di)404 static irqreturn_t ab8500_btemp_lowmed_handler(int irq, void *_di)
405 {
406 struct ab8500_btemp *di = _di;
407
408 dev_dbg(di->dev, "Battery temperature is between low and medium\n");
409
410 di->events.btemp_lowmed = true;
411 di->events.btemp_medhigh = false;
412 di->events.btemp_high = false;
413 di->events.btemp_low = false;
414 power_supply_changed(di->btemp_psy);
415
416 return IRQ_HANDLED;
417 }
418
419 /**
420 * ab8500_btemp_medhigh_handler() - battery temp between medium and high
421 * @irq: interrupt number
422 * @_di: void pointer that has to address of ab8500_btemp
423 *
424 * Returns IRQ status(IRQ_HANDLED)
425 */
ab8500_btemp_medhigh_handler(int irq,void * _di)426 static irqreturn_t ab8500_btemp_medhigh_handler(int irq, void *_di)
427 {
428 struct ab8500_btemp *di = _di;
429
430 dev_dbg(di->dev, "Battery temperature is between medium and high\n");
431
432 di->events.btemp_medhigh = true;
433 di->events.btemp_lowmed = false;
434 di->events.btemp_high = false;
435 di->events.btemp_low = false;
436 power_supply_changed(di->btemp_psy);
437
438 return IRQ_HANDLED;
439 }
440
441 /**
442 * ab8500_btemp_periodic() - Periodic temperature measurements
443 * @di: pointer to the ab8500_btemp structure
444 * @enable: enable or disable periodic temperature measurements
445 *
446 * Starts of stops periodic temperature measurements. Periodic measurements
447 * should only be done when a charger is connected.
448 */
ab8500_btemp_periodic(struct ab8500_btemp * di,bool enable)449 static void ab8500_btemp_periodic(struct ab8500_btemp *di,
450 bool enable)
451 {
452 dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n",
453 enable);
454 /*
455 * Make sure a new measurement is done directly by cancelling
456 * any pending work
457 */
458 cancel_delayed_work_sync(&di->btemp_periodic_work);
459
460 if (enable)
461 queue_delayed_work(di->btemp_wq, &di->btemp_periodic_work, 0);
462 }
463
464 /**
465 * ab8500_btemp_get_temp() - get battery temperature
466 * @di: pointer to the ab8500_btemp structure
467 *
468 * Returns battery temperature
469 */
ab8500_btemp_get_temp(struct ab8500_btemp * di)470 static int ab8500_btemp_get_temp(struct ab8500_btemp *di)
471 {
472 int temp = 0;
473
474 /*
475 * The BTEMP events are not reliabe on AB8500 cut3.3
476 * and prior versions
477 */
478 if (is_ab8500_3p3_or_earlier(di->parent)) {
479 temp = di->bat_temp * 10;
480 } else {
481 if (di->events.btemp_low) {
482 if (temp > di->btemp_ranges.btemp_low_limit)
483 temp = di->btemp_ranges.btemp_low_limit * 10;
484 else
485 temp = di->bat_temp * 10;
486 } else if (di->events.btemp_high) {
487 if (temp < di->btemp_ranges.btemp_high_limit)
488 temp = di->btemp_ranges.btemp_high_limit * 10;
489 else
490 temp = di->bat_temp * 10;
491 } else if (di->events.btemp_lowmed) {
492 if (temp > di->btemp_ranges.btemp_med_limit)
493 temp = di->btemp_ranges.btemp_med_limit * 10;
494 else
495 temp = di->bat_temp * 10;
496 } else if (di->events.btemp_medhigh) {
497 if (temp < di->btemp_ranges.btemp_med_limit)
498 temp = di->btemp_ranges.btemp_med_limit * 10;
499 else
500 temp = di->bat_temp * 10;
501 } else
502 temp = di->bat_temp * 10;
503 }
504 return temp;
505 }
506
507 /**
508 * ab8500_btemp_get_property() - get the btemp properties
509 * @psy: pointer to the power_supply structure
510 * @psp: pointer to the power_supply_property structure
511 * @val: pointer to the power_supply_propval union
512 *
513 * This function gets called when an application tries to get the btemp
514 * properties by reading the sysfs files.
515 * online: presence of the battery
516 * present: presence of the battery
517 * technology: battery technology
518 * temp: battery temperature
519 * Returns error code in case of failure else 0(on success)
520 */
ab8500_btemp_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)521 static int ab8500_btemp_get_property(struct power_supply *psy,
522 enum power_supply_property psp,
523 union power_supply_propval *val)
524 {
525 struct ab8500_btemp *di = power_supply_get_drvdata(psy);
526
527 switch (psp) {
528 case POWER_SUPPLY_PROP_PRESENT:
529 case POWER_SUPPLY_PROP_ONLINE:
530 if (di->events.batt_rem)
531 val->intval = 0;
532 else
533 val->intval = 1;
534 break;
535 case POWER_SUPPLY_PROP_TECHNOLOGY:
536 if (di->bm->bi)
537 val->intval = di->bm->bi->technology;
538 else
539 val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
540 break;
541 case POWER_SUPPLY_PROP_TEMP:
542 val->intval = ab8500_btemp_get_temp(di);
543 break;
544 default:
545 return -EINVAL;
546 }
547 return 0;
548 }
549
ab8500_btemp_get_ext_psy_data(struct device * dev,void * data)550 static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data)
551 {
552 struct power_supply *psy;
553 struct power_supply *ext = dev_get_drvdata(dev);
554 const char **supplicants = (const char **)ext->supplied_to;
555 struct ab8500_btemp *di;
556 union power_supply_propval ret;
557 int j;
558
559 psy = (struct power_supply *)data;
560 di = power_supply_get_drvdata(psy);
561
562 /*
563 * For all psy where the name of your driver
564 * appears in any supplied_to
565 */
566 j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
567 if (j < 0)
568 return 0;
569
570 /* Go through all properties for the psy */
571 for (j = 0; j < ext->desc->num_properties; j++) {
572 enum power_supply_property prop;
573 prop = ext->desc->properties[j];
574
575 if (power_supply_get_property(ext, prop, &ret))
576 continue;
577
578 switch (prop) {
579 case POWER_SUPPLY_PROP_PRESENT:
580 switch (ext->desc->type) {
581 case POWER_SUPPLY_TYPE_MAINS:
582 /* AC disconnected */
583 if (!ret.intval && di->events.ac_conn) {
584 di->events.ac_conn = false;
585 }
586 /* AC connected */
587 else if (ret.intval && !di->events.ac_conn) {
588 di->events.ac_conn = true;
589 if (!di->events.usb_conn)
590 ab8500_btemp_periodic(di, true);
591 }
592 break;
593 case POWER_SUPPLY_TYPE_USB:
594 /* USB disconnected */
595 if (!ret.intval && di->events.usb_conn) {
596 di->events.usb_conn = false;
597 }
598 /* USB connected */
599 else if (ret.intval && !di->events.usb_conn) {
600 di->events.usb_conn = true;
601 if (!di->events.ac_conn)
602 ab8500_btemp_periodic(di, true);
603 }
604 break;
605 default:
606 break;
607 }
608 break;
609 default:
610 break;
611 }
612 }
613 return 0;
614 }
615
616 /**
617 * ab8500_btemp_external_power_changed() - callback for power supply changes
618 * @psy: pointer to the structure power_supply
619 *
620 * This function is pointing to the function pointer external_power_changed
621 * of the structure power_supply.
622 * This function gets executed when there is a change in the external power
623 * supply to the btemp.
624 */
ab8500_btemp_external_power_changed(struct power_supply * psy)625 static void ab8500_btemp_external_power_changed(struct power_supply *psy)
626 {
627 struct ab8500_btemp *di = power_supply_get_drvdata(psy);
628
629 class_for_each_device(power_supply_class, NULL,
630 di->btemp_psy, ab8500_btemp_get_ext_psy_data);
631 }
632
633 /* ab8500 btemp driver interrupts and their respective isr */
634 static struct ab8500_btemp_interrupts ab8500_btemp_irq[] = {
635 {"BAT_CTRL_INDB", ab8500_btemp_batctrlindb_handler},
636 {"BTEMP_LOW", ab8500_btemp_templow_handler},
637 {"BTEMP_HIGH", ab8500_btemp_temphigh_handler},
638 {"BTEMP_LOW_MEDIUM", ab8500_btemp_lowmed_handler},
639 {"BTEMP_MEDIUM_HIGH", ab8500_btemp_medhigh_handler},
640 };
641
ab8500_btemp_resume(struct device * dev)642 static int __maybe_unused ab8500_btemp_resume(struct device *dev)
643 {
644 struct ab8500_btemp *di = dev_get_drvdata(dev);
645
646 ab8500_btemp_periodic(di, true);
647
648 return 0;
649 }
650
ab8500_btemp_suspend(struct device * dev)651 static int __maybe_unused ab8500_btemp_suspend(struct device *dev)
652 {
653 struct ab8500_btemp *di = dev_get_drvdata(dev);
654
655 ab8500_btemp_periodic(di, false);
656
657 return 0;
658 }
659
660 static char *supply_interface[] = {
661 "ab8500_chargalg",
662 "ab8500_fg",
663 };
664
665 static const struct power_supply_desc ab8500_btemp_desc = {
666 .name = "ab8500_btemp",
667 .type = POWER_SUPPLY_TYPE_BATTERY,
668 .properties = ab8500_btemp_props,
669 .num_properties = ARRAY_SIZE(ab8500_btemp_props),
670 .get_property = ab8500_btemp_get_property,
671 .external_power_changed = ab8500_btemp_external_power_changed,
672 };
673
ab8500_btemp_bind(struct device * dev,struct device * master,void * data)674 static int ab8500_btemp_bind(struct device *dev, struct device *master,
675 void *data)
676 {
677 struct ab8500_btemp *di = dev_get_drvdata(dev);
678
679 /* Create a work queue for the btemp */
680 di->btemp_wq =
681 alloc_workqueue("ab8500_btemp_wq", WQ_MEM_RECLAIM, 0);
682 if (di->btemp_wq == NULL) {
683 dev_err(dev, "failed to create work queue\n");
684 return -ENOMEM;
685 }
686
687 /* Kick off periodic temperature measurements */
688 ab8500_btemp_periodic(di, true);
689
690 return 0;
691 }
692
ab8500_btemp_unbind(struct device * dev,struct device * master,void * data)693 static void ab8500_btemp_unbind(struct device *dev, struct device *master,
694 void *data)
695 {
696 struct ab8500_btemp *di = dev_get_drvdata(dev);
697
698 /* Delete the work queue */
699 destroy_workqueue(di->btemp_wq);
700 flush_scheduled_work();
701 }
702
703 static const struct component_ops ab8500_btemp_component_ops = {
704 .bind = ab8500_btemp_bind,
705 .unbind = ab8500_btemp_unbind,
706 };
707
ab8500_btemp_probe(struct platform_device * pdev)708 static int ab8500_btemp_probe(struct platform_device *pdev)
709 {
710 struct power_supply_config psy_cfg = {};
711 struct device *dev = &pdev->dev;
712 struct ab8500_btemp *di;
713 int irq, i, ret = 0;
714 u8 val;
715
716 di = devm_kzalloc(dev, sizeof(*di), GFP_KERNEL);
717 if (!di)
718 return -ENOMEM;
719
720 di->bm = &ab8500_bm_data;
721
722 /* get parent data */
723 di->dev = dev;
724 di->parent = dev_get_drvdata(pdev->dev.parent);
725
726 /* Get thermal zone and ADC */
727 di->tz = thermal_zone_get_zone_by_name("battery-thermal");
728 if (IS_ERR(di->tz)) {
729 return dev_err_probe(dev, PTR_ERR(di->tz),
730 "failed to get battery thermal zone\n");
731 }
732 di->bat_ctrl = devm_iio_channel_get(dev, "bat_ctrl");
733 if (IS_ERR(di->bat_ctrl)) {
734 ret = dev_err_probe(dev, PTR_ERR(di->bat_ctrl),
735 "failed to get BAT CTRL ADC channel\n");
736 return ret;
737 }
738
739 di->initialized = false;
740
741 psy_cfg.supplied_to = supply_interface;
742 psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
743 psy_cfg.drv_data = di;
744
745 /* Init work for measuring temperature periodically */
746 INIT_DEFERRABLE_WORK(&di->btemp_periodic_work,
747 ab8500_btemp_periodic_work);
748
749 /* Set BTEMP thermal limits. Low and Med are fixed */
750 di->btemp_ranges.btemp_low_limit = BTEMP_THERMAL_LOW_LIMIT;
751 di->btemp_ranges.btemp_med_limit = BTEMP_THERMAL_MED_LIMIT;
752
753 ret = abx500_get_register_interruptible(dev, AB8500_CHARGER,
754 AB8500_BTEMP_HIGH_TH, &val);
755 if (ret < 0) {
756 dev_err(dev, "%s ab8500 read failed\n", __func__);
757 return ret;
758 }
759 switch (val) {
760 case BTEMP_HIGH_TH_57_0:
761 case BTEMP_HIGH_TH_57_1:
762 di->btemp_ranges.btemp_high_limit =
763 BTEMP_THERMAL_HIGH_LIMIT_57;
764 break;
765 case BTEMP_HIGH_TH_52:
766 di->btemp_ranges.btemp_high_limit =
767 BTEMP_THERMAL_HIGH_LIMIT_52;
768 break;
769 case BTEMP_HIGH_TH_62:
770 di->btemp_ranges.btemp_high_limit =
771 BTEMP_THERMAL_HIGH_LIMIT_62;
772 break;
773 }
774
775 /* Register BTEMP power supply class */
776 di->btemp_psy = devm_power_supply_register(dev, &ab8500_btemp_desc,
777 &psy_cfg);
778 if (IS_ERR(di->btemp_psy)) {
779 dev_err(dev, "failed to register BTEMP psy\n");
780 return PTR_ERR(di->btemp_psy);
781 }
782
783 /* Register interrupts */
784 for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
785 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
786 if (irq < 0)
787 return irq;
788
789 ret = devm_request_threaded_irq(dev, irq, NULL,
790 ab8500_btemp_irq[i].isr,
791 IRQF_SHARED | IRQF_NO_SUSPEND | IRQF_ONESHOT,
792 ab8500_btemp_irq[i].name, di);
793
794 if (ret) {
795 dev_err(dev, "failed to request %s IRQ %d: %d\n"
796 , ab8500_btemp_irq[i].name, irq, ret);
797 return ret;
798 }
799 dev_dbg(dev, "Requested %s IRQ %d: %d\n",
800 ab8500_btemp_irq[i].name, irq, ret);
801 }
802
803 platform_set_drvdata(pdev, di);
804
805 list_add_tail(&di->node, &ab8500_btemp_list);
806
807 return component_add(dev, &ab8500_btemp_component_ops);
808 }
809
ab8500_btemp_remove(struct platform_device * pdev)810 static int ab8500_btemp_remove(struct platform_device *pdev)
811 {
812 component_del(&pdev->dev, &ab8500_btemp_component_ops);
813
814 return 0;
815 }
816
817 static SIMPLE_DEV_PM_OPS(ab8500_btemp_pm_ops, ab8500_btemp_suspend, ab8500_btemp_resume);
818
819 static const struct of_device_id ab8500_btemp_match[] = {
820 { .compatible = "stericsson,ab8500-btemp", },
821 { },
822 };
823 MODULE_DEVICE_TABLE(of, ab8500_btemp_match);
824
825 struct platform_driver ab8500_btemp_driver = {
826 .probe = ab8500_btemp_probe,
827 .remove = ab8500_btemp_remove,
828 .driver = {
829 .name = "ab8500-btemp",
830 .of_match_table = ab8500_btemp_match,
831 .pm = &ab8500_btemp_pm_ops,
832 },
833 };
834 MODULE_LICENSE("GPL v2");
835 MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
836 MODULE_ALIAS("platform:ab8500-btemp");
837 MODULE_DESCRIPTION("AB8500 battery temperature driver");
838