ab8500_btemp.c

  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 */
 55struct ab8500_btemp_interrupts {
 56	char *name;
 57	irqreturn_t (*isr)(int irq, void *data);
 58};
 59
 60struct 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
 70struct 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 */
 95struct 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 */
115static enum power_supply_property ab8500_btemp_props[] = {
116	POWER_SUPPLY_PROP_PRESENT,
117	POWER_SUPPLY_PROP_ONLINE,
118	POWER_SUPPLY_PROP_TEMP,
119};
120
121static 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 */
133static 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 */
157static 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 */
180static 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 */
237static 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 */
270static 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 measurement */
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 */
336static 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 */
354static 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 */
381static 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 */
403static 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 */
425static 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 */
448static 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 */
469static 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 */
520static 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
543static int ab8500_btemp_get_ext_psy_data(struct power_supply *ext, void *data)
544{
545	struct power_supply *psy;
546	const char **supplicants = (const char **)ext->supplied_to;
547	struct ab8500_btemp *di;
548	union power_supply_propval ret;
549	int j;
550
551	psy = (struct power_supply *)data;
552	di = power_supply_get_drvdata(psy);
553
554	/*
555	 * For all psy where the name of your driver
556	 * appears in any supplied_to
557	 */
558	j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
559	if (j < 0)
560		return 0;
561
562	/* Go through all properties for the psy */
563	for (j = 0; j < ext->desc->num_properties; j++) {
564		enum power_supply_property prop;
565		prop = ext->desc->properties[j];
566
567		if (power_supply_get_property(ext, prop, &ret))
568			continue;
569
570		switch (prop) {
571		case POWER_SUPPLY_PROP_PRESENT:
572			switch (ext->desc->type) {
573			case POWER_SUPPLY_TYPE_MAINS:
574				/* AC disconnected */
575				if (!ret.intval && di->events.ac_conn) {
576					di->events.ac_conn = false;
577				}
578				/* AC connected */
579				else if (ret.intval && !di->events.ac_conn) {
580					di->events.ac_conn = true;
581					if (!di->events.usb_conn)
582						ab8500_btemp_periodic(di, true);
583				}
584				break;
585			case POWER_SUPPLY_TYPE_USB:
586				/* USB disconnected */
587				if (!ret.intval && di->events.usb_conn) {
588					di->events.usb_conn = false;
589				}
590				/* USB connected */
591				else if (ret.intval && !di->events.usb_conn) {
592					di->events.usb_conn = true;
593					if (!di->events.ac_conn)
594						ab8500_btemp_periodic(di, true);
595				}
596				break;
597			default:
598				break;
599			}
600			break;
601		default:
602			break;
603		}
604	}
605	return 0;
606}
607
608/**
609 * ab8500_btemp_external_power_changed() - callback for power supply changes
610 * @psy:       pointer to the structure power_supply
611 *
612 * This function is pointing to the function pointer external_power_changed
613 * of the structure power_supply.
614 * This function gets executed when there is a change in the external power
615 * supply to the btemp.
616 */
617static void ab8500_btemp_external_power_changed(struct power_supply *psy)
618{
619	power_supply_for_each_psy(psy, ab8500_btemp_get_ext_psy_data);
620}
621
622/* ab8500 btemp driver interrupts and their respective isr */
623static struct ab8500_btemp_interrupts ab8500_btemp_irq[] = {
624	{"BAT_CTRL_INDB", ab8500_btemp_batctrlindb_handler},
625	{"BTEMP_LOW", ab8500_btemp_templow_handler},
626	{"BTEMP_HIGH", ab8500_btemp_temphigh_handler},
627	{"BTEMP_LOW_MEDIUM", ab8500_btemp_lowmed_handler},
628	{"BTEMP_MEDIUM_HIGH", ab8500_btemp_medhigh_handler},
629};
630
631static int __maybe_unused ab8500_btemp_resume(struct device *dev)
632{
633	struct ab8500_btemp *di = dev_get_drvdata(dev);
634
635	ab8500_btemp_periodic(di, true);
636
637	return 0;
638}
639
640static int __maybe_unused ab8500_btemp_suspend(struct device *dev)
641{
642	struct ab8500_btemp *di = dev_get_drvdata(dev);
643
644	ab8500_btemp_periodic(di, false);
645
646	return 0;
647}
648
649static char *supply_interface[] = {
650	"ab8500_chargalg",
651	"ab8500_fg",
652};
653
654static const struct power_supply_desc ab8500_btemp_desc = {
655	.name			= "ab8500_btemp",
656	.type			= POWER_SUPPLY_TYPE_UNKNOWN,
657	.properties		= ab8500_btemp_props,
658	.num_properties		= ARRAY_SIZE(ab8500_btemp_props),
659	.get_property		= ab8500_btemp_get_property,
660	.external_power_changed	= ab8500_btemp_external_power_changed,
661};
662
663static int ab8500_btemp_bind(struct device *dev, struct device *master,
664			     void *data)
665{
666	struct ab8500_btemp *di = dev_get_drvdata(dev);
667
668	/* Create a work queue for the btemp */
669	di->btemp_wq =
670		alloc_workqueue("ab8500_btemp_wq", WQ_MEM_RECLAIM | WQ_PERCPU,
671				0);
672	if (di->btemp_wq == NULL) {
673		dev_err(dev, "failed to create work queue\n");
674		return -ENOMEM;
675	}
676
677	/* Kick off periodic temperature measurements */
678	ab8500_btemp_periodic(di, true);
679
680	return 0;
681}
682
683static void ab8500_btemp_unbind(struct device *dev, struct device *master,
684				void *data)
685{
686	struct ab8500_btemp *di = dev_get_drvdata(dev);
687
688	/* Delete the work queue */
689	destroy_workqueue(di->btemp_wq);
690}
691
692static const struct component_ops ab8500_btemp_component_ops = {
693	.bind = ab8500_btemp_bind,
694	.unbind = ab8500_btemp_unbind,
695};
696
697static int ab8500_btemp_probe(struct platform_device *pdev)
698{
699	struct power_supply_config psy_cfg = {};
700	struct device *dev = &pdev->dev;
701	struct ab8500_btemp *di;
702	int irq, i, ret = 0;
703	u8 val;
704
705	di = devm_kzalloc(dev, sizeof(*di), GFP_KERNEL);
706	if (!di)
707		return -ENOMEM;
708
709	di->bm = &ab8500_bm_data;
710
711	/* get parent data */
712	di->dev = dev;
713	di->parent = dev_get_drvdata(pdev->dev.parent);
714
715	/* Get thermal zone and ADC */
716	di->tz = thermal_zone_get_zone_by_name("battery-thermal");
717	if (IS_ERR(di->tz)) {
718		ret = PTR_ERR(di->tz);
719		/*
720		 * This usually just means we are probing before the thermal
721		 * zone, so just defer.
722		 */
723		if (ret == -ENODEV)
724			ret = -EPROBE_DEFER;
725		return dev_err_probe(dev, ret,
726				     "failed to get battery thermal zone\n");
727	}
728	di->bat_ctrl = devm_iio_channel_get(dev, "bat_ctrl");
729	if (IS_ERR(di->bat_ctrl)) {
730		ret = dev_err_probe(dev, PTR_ERR(di->bat_ctrl),
731				    "failed to get BAT CTRL ADC channel\n");
732		return ret;
733	}
734
735	di->initialized = false;
736
737	psy_cfg.supplied_to = supply_interface;
738	psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
739	psy_cfg.drv_data = di;
740
741	/* Init work for measuring temperature periodically */
742	INIT_DEFERRABLE_WORK(&di->btemp_periodic_work,
743		ab8500_btemp_periodic_work);
744
745	/* Set BTEMP thermal limits. Low and Med are fixed */
746	di->btemp_ranges.btemp_low_limit = BTEMP_THERMAL_LOW_LIMIT;
747	di->btemp_ranges.btemp_med_limit = BTEMP_THERMAL_MED_LIMIT;
748
749	ret = abx500_get_register_interruptible(dev, AB8500_CHARGER,
750		AB8500_BTEMP_HIGH_TH, &val);
751	if (ret < 0) {
752		dev_err(dev, "%s ab8500 read failed\n", __func__);
753		return ret;
754	}
755	switch (val) {
756	case BTEMP_HIGH_TH_57_0:
757	case BTEMP_HIGH_TH_57_1:
758		di->btemp_ranges.btemp_high_limit =
759			BTEMP_THERMAL_HIGH_LIMIT_57;
760		break;
761	case BTEMP_HIGH_TH_52:
762		di->btemp_ranges.btemp_high_limit =
763			BTEMP_THERMAL_HIGH_LIMIT_52;
764		break;
765	case BTEMP_HIGH_TH_62:
766		di->btemp_ranges.btemp_high_limit =
767			BTEMP_THERMAL_HIGH_LIMIT_62;
768		break;
769	}
770
771	/* Register BTEMP power supply class */
772	di->btemp_psy = devm_power_supply_register(dev, &ab8500_btemp_desc,
773						   &psy_cfg);
774	if (IS_ERR(di->btemp_psy)) {
775		dev_err(dev, "failed to register BTEMP psy\n");
776		return PTR_ERR(di->btemp_psy);
777	}
778
779	/* Register interrupts */
780	for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
781		irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
782		if (irq < 0)
783			return irq;
784
785		ret = devm_request_threaded_irq(dev, irq, NULL,
786			ab8500_btemp_irq[i].isr,
787			IRQF_SHARED | IRQF_NO_SUSPEND | IRQF_ONESHOT,
788			ab8500_btemp_irq[i].name, di);
789
790		if (ret) {
791			dev_err(dev, "failed to request %s IRQ %d: %d\n"
792				, ab8500_btemp_irq[i].name, irq, ret);
793			return ret;
794		}
795		dev_dbg(dev, "Requested %s IRQ %d: %d\n",
796			ab8500_btemp_irq[i].name, irq, ret);
797	}
798
799	platform_set_drvdata(pdev, di);
800
801	list_add_tail(&di->node, &ab8500_btemp_list);
802
803	return component_add(dev, &ab8500_btemp_component_ops);
804}
805
806static void ab8500_btemp_remove(struct platform_device *pdev)
807{
808	component_del(&pdev->dev, &ab8500_btemp_component_ops);
809}
810
811static SIMPLE_DEV_PM_OPS(ab8500_btemp_pm_ops, ab8500_btemp_suspend, ab8500_btemp_resume);
812
813static const struct of_device_id ab8500_btemp_match[] = {
814	{ .compatible = "stericsson,ab8500-btemp", },
815	{ },
816};
817MODULE_DEVICE_TABLE(of, ab8500_btemp_match);
818
819struct platform_driver ab8500_btemp_driver = {
820	.probe = ab8500_btemp_probe,
821	.remove = ab8500_btemp_remove,
822	.driver = {
823		.name = "ab8500-btemp",
824		.of_match_table = ab8500_btemp_match,
825		.pm = &ab8500_btemp_pm_ops,
826	},
827};
828MODULE_LICENSE("GPL v2");
829MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
830MODULE_ALIAS("platform:ab8500-btemp");
831MODULE_DESCRIPTION("AB8500 battery temperature driver");