1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) ST-Ericsson SA 2012
5 * Battery temperature driver for AB8500
8 * Johan Palsson <johan.palsson@stericsson.com>
9 * Karl Komierowski <karl.komierowski@stericsson.com>
10 * Arun R Murthy <arun.murthy@stericsson.com>
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/jiffies.h>
25 #include <linux/mfd/core.h>
26 #include <linux/mfd/abx500.h>
27 #include <linux/mfd/abx500/ab8500.h>
28 #include <linux/mfd/abx500/ab8500-bm.h>
29 #include <linux/iio/consumer.h>
33 #define BTEMP_THERMAL_LOW_LIMIT -10
34 #define BTEMP_THERMAL_MED_LIMIT 0
35 #define BTEMP_THERMAL_HIGH_LIMIT_52 52
36 #define BTEMP_THERMAL_HIGH_LIMIT_57 57
37 #define BTEMP_THERMAL_HIGH_LIMIT_62 62
39 #define BTEMP_BATCTRL_CURR_SRC_7UA 7
40 #define BTEMP_BATCTRL_CURR_SRC_20UA 20
42 #define BTEMP_BATCTRL_CURR_SRC_16UA 16
43 #define BTEMP_BATCTRL_CURR_SRC_18UA 18
45 #define BTEMP_BATCTRL_CURR_SRC_60UA 60
46 #define BTEMP_BATCTRL_CURR_SRC_120UA 120
49 * struct ab8500_btemp_interrupts - ab8500 interrupts
50 * @name: name of the interrupt
51 * @isr function pointer to the isr
53 struct ab8500_btemp_interrupts {
55 irqreturn_t (*isr)(int irq, void *data);
58 struct ab8500_btemp_events {
68 struct ab8500_btemp_ranges {
75 * struct ab8500_btemp - ab8500 BTEMP device information
76 * @dev: Pointer to the structure device
77 * @node: List of AB8500 BTEMPs, hence prepared for reentrance
78 * @curr_source: What current source we use, in uA
79 * @bat_temp: Dispatched battery temperature in degree Celsius
80 * @prev_bat_temp Last measured battery temperature in degree Celsius
81 * @parent: Pointer to the struct ab8500
82 * @adc_btemp_ball: ADC channel for the battery ball temperature
83 * @adc_bat_ctrl: ADC channel for the battery control
84 * @fg: Pointer to the struct fg
85 * @bm: Platform specific battery management information
86 * @btemp_psy: Structure for BTEMP specific battery properties
87 * @events: Structure for information about events triggered
88 * @btemp_ranges: Battery temperature range structure
89 * @btemp_wq: Work queue for measuring the temperature periodically
90 * @btemp_periodic_work: Work for measuring the temperature periodically
91 * @initialized: True if battery id read.
95 struct list_head node;
99 struct ab8500 *parent;
100 struct iio_channel *btemp_ball;
101 struct iio_channel *bat_ctrl;
102 struct ab8500_fg *fg;
103 struct abx500_bm_data *bm;
104 struct power_supply *btemp_psy;
105 struct ab8500_btemp_events events;
106 struct ab8500_btemp_ranges btemp_ranges;
107 struct workqueue_struct *btemp_wq;
108 struct delayed_work btemp_periodic_work;
112 /* BTEMP power supply properties */
113 static enum power_supply_property ab8500_btemp_props[] = {
114 POWER_SUPPLY_PROP_PRESENT,
115 POWER_SUPPLY_PROP_ONLINE,
116 POWER_SUPPLY_PROP_TECHNOLOGY,
117 POWER_SUPPLY_PROP_TEMP,
120 static LIST_HEAD(ab8500_btemp_list);
123 * ab8500_btemp_get() - returns a reference to the primary AB8500 BTEMP
124 * (i.e. the first BTEMP in the instance list)
126 struct ab8500_btemp *ab8500_btemp_get(void)
128 return list_first_entry(&ab8500_btemp_list, struct ab8500_btemp, node);
130 EXPORT_SYMBOL(ab8500_btemp_get);
133 * ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance
134 * @di: pointer to the ab8500_btemp structure
135 * @v_batctrl: measured batctrl voltage
136 * @inst_curr: measured instant current
138 * This function returns the battery resistance that is
139 * derived from the BATCTRL voltage.
140 * Returns value in Ohms.
142 static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di,
143 int v_batctrl, int inst_curr)
147 if (is_ab8500_1p1_or_earlier(di->parent)) {
149 * For ABB cut1.0 and 1.1 BAT_CTRL is internally
150 * connected to 1.8V through a 450k resistor
152 return (450000 * (v_batctrl)) / (1800 - v_batctrl);
155 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL) {
157 * If the battery has internal NTC, we use the current
158 * source to calculate the resistance.
160 rbs = (v_batctrl * 1000
161 - di->bm->gnd_lift_resistance * inst_curr)
165 * BAT_CTRL is internally
166 * connected to 1.8V through a 80k resistor
168 rbs = (80000 * (v_batctrl)) / (1800 - v_batctrl);
175 * ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage
176 * @di: pointer to the ab8500_btemp structure
178 * This function returns the voltage on BATCTRL. Returns value in mV.
180 static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp *di)
185 ret = iio_read_channel_processed(di->bat_ctrl, &vbtemp);
188 "%s ADC conversion failed, using previous value",
197 * ab8500_btemp_curr_source_enable() - enable/disable batctrl current source
198 * @di: pointer to the ab8500_btemp structure
199 * @enable: enable or disable the current source
201 * Enable or disable the current sources for the BatCtrl AD channel
203 static int ab8500_btemp_curr_source_enable(struct ab8500_btemp *di,
210 * BATCTRL current sources are included on AB8500 cut2.0
211 * and future versions
213 if (is_ab8500_1p1_or_earlier(di->parent))
216 /* Only do this for batteries with internal NTC */
217 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && enable) {
219 if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_7UA)
220 curr = BAT_CTRL_7U_ENA;
222 curr = BAT_CTRL_20U_ENA;
224 dev_dbg(di->dev, "Set BATCTRL %duA\n", di->curr_source);
226 ret = abx500_mask_and_set_register_interruptible(di->dev,
227 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
228 FORCE_BAT_CTRL_CMP_HIGH, FORCE_BAT_CTRL_CMP_HIGH);
230 dev_err(di->dev, "%s failed setting cmp_force\n",
236 * We have to wait one 32kHz cycle before enabling
237 * the current source, since ForceBatCtrlCmpHigh needs
238 * to be written in a separate cycle
242 ret = abx500_set_register_interruptible(di->dev,
243 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
244 FORCE_BAT_CTRL_CMP_HIGH | curr);
246 dev_err(di->dev, "%s failed enabling current source\n",
248 goto disable_curr_source;
250 } else if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && !enable) {
251 dev_dbg(di->dev, "Disable BATCTRL curr source\n");
253 /* Write 0 to the curr bits */
254 ret = abx500_mask_and_set_register_interruptible(
256 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
257 BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
258 ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
261 dev_err(di->dev, "%s failed disabling current source\n",
263 goto disable_curr_source;
266 /* Enable Pull-Up and comparator */
267 ret = abx500_mask_and_set_register_interruptible(di->dev,
268 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
269 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
270 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
272 dev_err(di->dev, "%s failed enabling PU and comp\n",
278 * We have to wait one 32kHz cycle before disabling
279 * ForceBatCtrlCmpHigh since this needs to be written
280 * in a separate cycle
284 /* Disable 'force comparator' */
285 ret = abx500_mask_and_set_register_interruptible(di->dev,
286 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
287 FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
289 dev_err(di->dev, "%s failed disabling force comp\n",
291 goto disable_force_comp;
297 * We have to try unsetting FORCE_BAT_CTRL_CMP_HIGH one more time
298 * if we got an error above
301 /* Write 0 to the curr bits */
302 ret = abx500_mask_and_set_register_interruptible(di->dev,
303 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
304 BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
305 ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
308 dev_err(di->dev, "%s failed disabling current source\n",
313 /* Enable Pull-Up and comparator */
314 ret = abx500_mask_and_set_register_interruptible(di->dev,
315 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
316 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
317 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
319 dev_err(di->dev, "%s failed enabling PU and comp\n",
326 * We have to wait one 32kHz cycle before disabling
327 * ForceBatCtrlCmpHigh since this needs to be written
328 * in a separate cycle
332 /* Disable 'force comparator' */
333 ret = abx500_mask_and_set_register_interruptible(di->dev,
334 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
335 FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
337 dev_err(di->dev, "%s failed disabling force comp\n",
346 * ab8500_btemp_get_batctrl_res() - get battery resistance
347 * @di: pointer to the ab8500_btemp structure
349 * This function returns the battery pack identification resistance.
350 * Returns value in Ohms.
352 static int ab8500_btemp_get_batctrl_res(struct ab8500_btemp *di)
361 * BATCTRL current sources are included on AB8500 cut2.0
362 * and future versions
364 ret = ab8500_btemp_curr_source_enable(di, true);
366 dev_err(di->dev, "%s curr source enabled failed\n", __func__);
371 di->fg = ab8500_fg_get();
373 dev_err(di->dev, "No fg found\n");
377 ret = ab8500_fg_inst_curr_start(di->fg);
380 dev_err(di->dev, "Failed to start current measurement\n");
386 } while (!ab8500_fg_inst_curr_started(di->fg));
391 batctrl += ab8500_btemp_read_batctrl_voltage(di);
394 } while (!ab8500_fg_inst_curr_done(di->fg));
397 ret = ab8500_fg_inst_curr_finalize(di->fg, &inst_curr);
399 dev_err(di->dev, "Failed to finalize current measurement\n");
403 res = ab8500_btemp_batctrl_volt_to_res(di, batctrl, inst_curr);
405 ret = ab8500_btemp_curr_source_enable(di, false);
407 dev_err(di->dev, "%s curr source disable failed\n", __func__);
411 dev_dbg(di->dev, "%s batctrl: %d res: %d inst_curr: %d samples: %d\n",
412 __func__, batctrl, res, inst_curr, i);
418 * ab8500_btemp_res_to_temp() - resistance to temperature
419 * @di: pointer to the ab8500_btemp structure
420 * @tbl: pointer to the resiatance to temperature table
421 * @tbl_size: size of the resistance to temperature table
422 * @res: resistance to calculate the temperature from
424 * This function returns the battery temperature in degrees Celsius
425 * based on the NTC resistance.
427 static int ab8500_btemp_res_to_temp(struct ab8500_btemp *di,
428 const struct abx500_res_to_temp *tbl, int tbl_size, int res)
432 * Calculate the formula for the straight line
433 * Simple interpolation if we are within
434 * the resistance table limits, extrapolate
435 * if resistance is outside the limits.
437 if (res > tbl[0].resist)
439 else if (res <= tbl[tbl_size - 1].resist)
443 while (!(res <= tbl[i].resist &&
444 res > tbl[i + 1].resist))
448 return tbl[i].temp + ((tbl[i + 1].temp - tbl[i].temp) *
449 (res - tbl[i].resist)) / (tbl[i + 1].resist - tbl[i].resist);
453 * ab8500_btemp_measure_temp() - measure battery temperature
454 * @di: pointer to the ab8500_btemp structure
456 * Returns battery temperature (on success) else the previous temperature
458 static int ab8500_btemp_measure_temp(struct ab8500_btemp *di)
462 int rbat, rntc, vntc;
465 id = di->bm->batt_id;
467 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL &&
468 id != BATTERY_UNKNOWN) {
470 rbat = ab8500_btemp_get_batctrl_res(di);
472 dev_err(di->dev, "%s get batctrl res failed\n",
475 * Return out-of-range temperature so that
476 * charging is stopped
478 return BTEMP_THERMAL_LOW_LIMIT;
481 temp = ab8500_btemp_res_to_temp(di,
482 di->bm->bat_type[id].r_to_t_tbl,
483 di->bm->bat_type[id].n_temp_tbl_elements, rbat);
485 ret = iio_read_channel_processed(di->btemp_ball, &vntc);
488 "%s ADC conversion failed,"
489 " using previous value\n", __func__);
493 * The PCB NTC is sourced from VTVOUT via a 230kOhm
496 rntc = 230000 * vntc / (VTVOUT_V - vntc);
498 temp = ab8500_btemp_res_to_temp(di,
499 di->bm->bat_type[id].r_to_t_tbl,
500 di->bm->bat_type[id].n_temp_tbl_elements, rntc);
503 dev_dbg(di->dev, "Battery temperature is %d\n", temp);
508 * ab8500_btemp_id() - Identify the connected battery
509 * @di: pointer to the ab8500_btemp structure
511 * This function will try to identify the battery by reading the ID
512 * resistor. Some brands use a combined ID resistor with a NTC resistor to
513 * both be able to identify and to read the temperature of it.
515 static int ab8500_btemp_id(struct ab8500_btemp *di)
520 di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA;
521 di->bm->batt_id = BATTERY_UNKNOWN;
523 res = ab8500_btemp_get_batctrl_res(di);
525 dev_err(di->dev, "%s get batctrl res failed\n", __func__);
529 /* BATTERY_UNKNOWN is defined on position 0, skip it! */
530 for (i = BATTERY_UNKNOWN + 1; i < di->bm->n_btypes; i++) {
531 if ((res <= di->bm->bat_type[i].resis_high) &&
532 (res >= di->bm->bat_type[i].resis_low)) {
533 dev_dbg(di->dev, "Battery detected on %s"
534 " low %d < res %d < high: %d"
536 di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL ?
537 "BATCTRL" : "BATTEMP",
538 di->bm->bat_type[i].resis_low, res,
539 di->bm->bat_type[i].resis_high, i);
546 if (di->bm->batt_id == BATTERY_UNKNOWN) {
547 dev_warn(di->dev, "Battery identified as unknown"
548 ", resistance %d Ohm\n", res);
553 * We only have to change current source if the
554 * detected type is Type 1.
556 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL &&
557 di->bm->batt_id == 1) {
558 dev_dbg(di->dev, "Set BATCTRL current source to 20uA\n");
559 di->curr_source = BTEMP_BATCTRL_CURR_SRC_20UA;
562 return di->bm->batt_id;
566 * ab8500_btemp_periodic_work() - Measuring the temperature periodically
567 * @work: pointer to the work_struct structure
569 * Work function for measuring the temperature periodically
571 static void ab8500_btemp_periodic_work(struct work_struct *work)
575 struct ab8500_btemp *di = container_of(work,
576 struct ab8500_btemp, btemp_periodic_work.work);
578 if (!di->initialized) {
579 /* Identify the battery */
580 if (ab8500_btemp_id(di) < 0)
581 dev_warn(di->dev, "failed to identify the battery\n");
584 bat_temp = ab8500_btemp_measure_temp(di);
586 * Filter battery temperature.
587 * Allow direct updates on temperature only if two samples result in
588 * same temperature. Else only allow 1 degree change from previous
589 * reported value in the direction of the new measurement.
591 if ((bat_temp == di->prev_bat_temp) || !di->initialized) {
592 if ((di->bat_temp != di->prev_bat_temp) || !di->initialized) {
593 di->initialized = true;
594 di->bat_temp = bat_temp;
595 power_supply_changed(di->btemp_psy);
597 } else if (bat_temp < di->prev_bat_temp) {
599 power_supply_changed(di->btemp_psy);
600 } else if (bat_temp > di->prev_bat_temp) {
602 power_supply_changed(di->btemp_psy);
604 di->prev_bat_temp = bat_temp;
606 if (di->events.ac_conn || di->events.usb_conn)
607 interval = di->bm->temp_interval_chg;
609 interval = di->bm->temp_interval_nochg;
611 /* Schedule a new measurement */
612 queue_delayed_work(di->btemp_wq,
613 &di->btemp_periodic_work,
614 round_jiffies(interval * HZ));
618 * ab8500_btemp_batctrlindb_handler() - battery removal detected
619 * @irq: interrupt number
620 * @_di: void pointer that has to address of ab8500_btemp
622 * Returns IRQ status(IRQ_HANDLED)
624 static irqreturn_t ab8500_btemp_batctrlindb_handler(int irq, void *_di)
626 struct ab8500_btemp *di = _di;
627 dev_err(di->dev, "Battery removal detected!\n");
629 di->events.batt_rem = true;
630 power_supply_changed(di->btemp_psy);
636 * ab8500_btemp_templow_handler() - battery temp lower than 10 degrees
637 * @irq: interrupt number
638 * @_di: void pointer that has to address of ab8500_btemp
640 * Returns IRQ status(IRQ_HANDLED)
642 static irqreturn_t ab8500_btemp_templow_handler(int irq, void *_di)
644 struct ab8500_btemp *di = _di;
646 if (is_ab8500_3p3_or_earlier(di->parent)) {
647 dev_dbg(di->dev, "Ignore false btemp low irq"
648 " for ABB cut 1.0, 1.1, 2.0 and 3.3\n");
650 dev_crit(di->dev, "Battery temperature lower than -10deg c\n");
652 di->events.btemp_low = true;
653 di->events.btemp_high = false;
654 di->events.btemp_medhigh = false;
655 di->events.btemp_lowmed = false;
656 power_supply_changed(di->btemp_psy);
663 * ab8500_btemp_temphigh_handler() - battery temp higher than max temp
664 * @irq: interrupt number
665 * @_di: void pointer that has to address of ab8500_btemp
667 * Returns IRQ status(IRQ_HANDLED)
669 static irqreturn_t ab8500_btemp_temphigh_handler(int irq, void *_di)
671 struct ab8500_btemp *di = _di;
673 dev_crit(di->dev, "Battery temperature is higher than MAX temp\n");
675 di->events.btemp_high = true;
676 di->events.btemp_medhigh = false;
677 di->events.btemp_lowmed = false;
678 di->events.btemp_low = false;
679 power_supply_changed(di->btemp_psy);
685 * ab8500_btemp_lowmed_handler() - battery temp between low and medium
686 * @irq: interrupt number
687 * @_di: void pointer that has to address of ab8500_btemp
689 * Returns IRQ status(IRQ_HANDLED)
691 static irqreturn_t ab8500_btemp_lowmed_handler(int irq, void *_di)
693 struct ab8500_btemp *di = _di;
695 dev_dbg(di->dev, "Battery temperature is between low and medium\n");
697 di->events.btemp_lowmed = true;
698 di->events.btemp_medhigh = false;
699 di->events.btemp_high = false;
700 di->events.btemp_low = false;
701 power_supply_changed(di->btemp_psy);
707 * ab8500_btemp_medhigh_handler() - battery temp between medium and high
708 * @irq: interrupt number
709 * @_di: void pointer that has to address of ab8500_btemp
711 * Returns IRQ status(IRQ_HANDLED)
713 static irqreturn_t ab8500_btemp_medhigh_handler(int irq, void *_di)
715 struct ab8500_btemp *di = _di;
717 dev_dbg(di->dev, "Battery temperature is between medium and high\n");
719 di->events.btemp_medhigh = true;
720 di->events.btemp_lowmed = false;
721 di->events.btemp_high = false;
722 di->events.btemp_low = false;
723 power_supply_changed(di->btemp_psy);
729 * ab8500_btemp_periodic() - Periodic temperature measurements
730 * @di: pointer to the ab8500_btemp structure
731 * @enable: enable or disable periodic temperature measurements
733 * Starts of stops periodic temperature measurements. Periodic measurements
734 * should only be done when a charger is connected.
736 static void ab8500_btemp_periodic(struct ab8500_btemp *di,
739 dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n",
742 * Make sure a new measurement is done directly by cancelling
745 cancel_delayed_work_sync(&di->btemp_periodic_work);
748 queue_delayed_work(di->btemp_wq, &di->btemp_periodic_work, 0);
752 * ab8500_btemp_get_temp() - get battery temperature
753 * @di: pointer to the ab8500_btemp structure
755 * Returns battery temperature
757 int ab8500_btemp_get_temp(struct ab8500_btemp *di)
762 * The BTEMP events are not reliabe on AB8500 cut3.3
765 if (is_ab8500_3p3_or_earlier(di->parent)) {
766 temp = di->bat_temp * 10;
768 if (di->events.btemp_low) {
769 if (temp > di->btemp_ranges.btemp_low_limit)
770 temp = di->btemp_ranges.btemp_low_limit * 10;
772 temp = di->bat_temp * 10;
773 } else if (di->events.btemp_high) {
774 if (temp < di->btemp_ranges.btemp_high_limit)
775 temp = di->btemp_ranges.btemp_high_limit * 10;
777 temp = di->bat_temp * 10;
778 } else if (di->events.btemp_lowmed) {
779 if (temp > di->btemp_ranges.btemp_med_limit)
780 temp = di->btemp_ranges.btemp_med_limit * 10;
782 temp = di->bat_temp * 10;
783 } else if (di->events.btemp_medhigh) {
784 if (temp < di->btemp_ranges.btemp_med_limit)
785 temp = di->btemp_ranges.btemp_med_limit * 10;
787 temp = di->bat_temp * 10;
789 temp = di->bat_temp * 10;
793 EXPORT_SYMBOL(ab8500_btemp_get_temp);
796 * ab8500_btemp_get_batctrl_temp() - get the temperature
797 * @btemp: pointer to the btemp structure
799 * Returns the batctrl temperature in millidegrees
801 int ab8500_btemp_get_batctrl_temp(struct ab8500_btemp *btemp)
803 return btemp->bat_temp * 1000;
805 EXPORT_SYMBOL(ab8500_btemp_get_batctrl_temp);
808 * ab8500_btemp_get_property() - get the btemp properties
809 * @psy: pointer to the power_supply structure
810 * @psp: pointer to the power_supply_property structure
811 * @val: pointer to the power_supply_propval union
813 * This function gets called when an application tries to get the btemp
814 * properties by reading the sysfs files.
815 * online: presence of the battery
816 * present: presence of the battery
817 * technology: battery technology
818 * temp: battery temperature
819 * Returns error code in case of failure else 0(on success)
821 static int ab8500_btemp_get_property(struct power_supply *psy,
822 enum power_supply_property psp,
823 union power_supply_propval *val)
825 struct ab8500_btemp *di = power_supply_get_drvdata(psy);
828 case POWER_SUPPLY_PROP_PRESENT:
829 case POWER_SUPPLY_PROP_ONLINE:
830 if (di->events.batt_rem)
835 case POWER_SUPPLY_PROP_TECHNOLOGY:
836 val->intval = di->bm->bat_type[di->bm->batt_id].name;
838 case POWER_SUPPLY_PROP_TEMP:
839 val->intval = ab8500_btemp_get_temp(di);
847 static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data)
849 struct power_supply *psy;
850 struct power_supply *ext = dev_get_drvdata(dev);
851 const char **supplicants = (const char **)ext->supplied_to;
852 struct ab8500_btemp *di;
853 union power_supply_propval ret;
856 psy = (struct power_supply *)data;
857 di = power_supply_get_drvdata(psy);
860 * For all psy where the name of your driver
861 * appears in any supplied_to
863 j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
867 /* Go through all properties for the psy */
868 for (j = 0; j < ext->desc->num_properties; j++) {
869 enum power_supply_property prop;
870 prop = ext->desc->properties[j];
872 if (power_supply_get_property(ext, prop, &ret))
876 case POWER_SUPPLY_PROP_PRESENT:
877 switch (ext->desc->type) {
878 case POWER_SUPPLY_TYPE_MAINS:
879 /* AC disconnected */
880 if (!ret.intval && di->events.ac_conn) {
881 di->events.ac_conn = false;
884 else if (ret.intval && !di->events.ac_conn) {
885 di->events.ac_conn = true;
886 if (!di->events.usb_conn)
887 ab8500_btemp_periodic(di, true);
890 case POWER_SUPPLY_TYPE_USB:
891 /* USB disconnected */
892 if (!ret.intval && di->events.usb_conn) {
893 di->events.usb_conn = false;
896 else if (ret.intval && !di->events.usb_conn) {
897 di->events.usb_conn = true;
898 if (!di->events.ac_conn)
899 ab8500_btemp_periodic(di, true);
914 * ab8500_btemp_external_power_changed() - callback for power supply changes
915 * @psy: pointer to the structure power_supply
917 * This function is pointing to the function pointer external_power_changed
918 * of the structure power_supply.
919 * This function gets executed when there is a change in the external power
920 * supply to the btemp.
922 static void ab8500_btemp_external_power_changed(struct power_supply *psy)
924 struct ab8500_btemp *di = power_supply_get_drvdata(psy);
926 class_for_each_device(power_supply_class, NULL,
927 di->btemp_psy, ab8500_btemp_get_ext_psy_data);
930 /* ab8500 btemp driver interrupts and their respective isr */
931 static struct ab8500_btemp_interrupts ab8500_btemp_irq[] = {
932 {"BAT_CTRL_INDB", ab8500_btemp_batctrlindb_handler},
933 {"BTEMP_LOW", ab8500_btemp_templow_handler},
934 {"BTEMP_HIGH", ab8500_btemp_temphigh_handler},
935 {"BTEMP_LOW_MEDIUM", ab8500_btemp_lowmed_handler},
936 {"BTEMP_MEDIUM_HIGH", ab8500_btemp_medhigh_handler},
939 static int __maybe_unused ab8500_btemp_resume(struct device *dev)
941 struct ab8500_btemp *di = dev_get_drvdata(dev);
943 ab8500_btemp_periodic(di, true);
948 static int __maybe_unused ab8500_btemp_suspend(struct device *dev)
950 struct ab8500_btemp *di = dev_get_drvdata(dev);
952 ab8500_btemp_periodic(di, false);
957 static int ab8500_btemp_remove(struct platform_device *pdev)
959 struct ab8500_btemp *di = platform_get_drvdata(pdev);
962 /* Disable interrupts */
963 for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
964 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
968 /* Delete the work queue */
969 destroy_workqueue(di->btemp_wq);
971 flush_scheduled_work();
972 power_supply_unregister(di->btemp_psy);
977 static char *supply_interface[] = {
982 static const struct power_supply_desc ab8500_btemp_desc = {
983 .name = "ab8500_btemp",
984 .type = POWER_SUPPLY_TYPE_BATTERY,
985 .properties = ab8500_btemp_props,
986 .num_properties = ARRAY_SIZE(ab8500_btemp_props),
987 .get_property = ab8500_btemp_get_property,
988 .external_power_changed = ab8500_btemp_external_power_changed,
991 static int ab8500_btemp_probe(struct platform_device *pdev)
993 struct device_node *np = pdev->dev.of_node;
994 struct abx500_bm_data *plat = pdev->dev.platform_data;
995 struct power_supply_config psy_cfg = {};
996 struct device *dev = &pdev->dev;
997 struct ab8500_btemp *di;
1001 di = devm_kzalloc(dev, sizeof(*di), GFP_KERNEL);
1006 dev_err(dev, "no battery management data supplied\n");
1011 ret = ab8500_bm_of_probe(dev, np, di->bm);
1013 dev_err(dev, "failed to get battery information\n");
1017 /* get parent data */
1019 di->parent = dev_get_drvdata(pdev->dev.parent);
1021 /* Get ADC channels */
1022 di->btemp_ball = devm_iio_channel_get(dev, "btemp_ball");
1023 if (IS_ERR(di->btemp_ball)) {
1024 ret = dev_err_probe(dev, PTR_ERR(di->btemp_ball),
1025 "failed to get BTEMP BALL ADC channel\n");
1028 di->bat_ctrl = devm_iio_channel_get(dev, "bat_ctrl");
1029 if (IS_ERR(di->bat_ctrl)) {
1030 ret = dev_err_probe(dev, PTR_ERR(di->bat_ctrl),
1031 "failed to get BAT CTRL ADC channel\n");
1035 di->initialized = false;
1037 psy_cfg.supplied_to = supply_interface;
1038 psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
1039 psy_cfg.drv_data = di;
1041 /* Create a work queue for the btemp */
1043 alloc_workqueue("ab8500_btemp_wq", WQ_MEM_RECLAIM, 0);
1044 if (di->btemp_wq == NULL) {
1045 dev_err(dev, "failed to create work queue\n");
1049 /* Init work for measuring temperature periodically */
1050 INIT_DEFERRABLE_WORK(&di->btemp_periodic_work,
1051 ab8500_btemp_periodic_work);
1053 /* Set BTEMP thermal limits. Low and Med are fixed */
1054 di->btemp_ranges.btemp_low_limit = BTEMP_THERMAL_LOW_LIMIT;
1055 di->btemp_ranges.btemp_med_limit = BTEMP_THERMAL_MED_LIMIT;
1057 ret = abx500_get_register_interruptible(dev, AB8500_CHARGER,
1058 AB8500_BTEMP_HIGH_TH, &val);
1060 dev_err(dev, "%s ab8500 read failed\n", __func__);
1064 case BTEMP_HIGH_TH_57_0:
1065 case BTEMP_HIGH_TH_57_1:
1066 di->btemp_ranges.btemp_high_limit =
1067 BTEMP_THERMAL_HIGH_LIMIT_57;
1069 case BTEMP_HIGH_TH_52:
1070 di->btemp_ranges.btemp_high_limit =
1071 BTEMP_THERMAL_HIGH_LIMIT_52;
1073 case BTEMP_HIGH_TH_62:
1074 di->btemp_ranges.btemp_high_limit =
1075 BTEMP_THERMAL_HIGH_LIMIT_62;
1079 /* Register BTEMP power supply class */
1080 di->btemp_psy = power_supply_register(dev, &ab8500_btemp_desc,
1082 if (IS_ERR(di->btemp_psy)) {
1083 dev_err(dev, "failed to register BTEMP psy\n");
1084 ret = PTR_ERR(di->btemp_psy);
1088 /* Register interrupts */
1089 for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
1090 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1096 ret = request_threaded_irq(irq, NULL, ab8500_btemp_irq[i].isr,
1097 IRQF_SHARED | IRQF_NO_SUSPEND | IRQF_ONESHOT,
1098 ab8500_btemp_irq[i].name, di);
1101 dev_err(dev, "failed to request %s IRQ %d: %d\n"
1102 , ab8500_btemp_irq[i].name, irq, ret);
1105 dev_dbg(dev, "Requested %s IRQ %d: %d\n",
1106 ab8500_btemp_irq[i].name, irq, ret);
1109 platform_set_drvdata(pdev, di);
1111 /* Kick off periodic temperature measurements */
1112 ab8500_btemp_periodic(di, true);
1113 list_add_tail(&di->node, &ab8500_btemp_list);
1118 /* We also have to free all successfully registered irqs */
1119 for (i = i - 1; i >= 0; i--) {
1120 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1124 power_supply_unregister(di->btemp_psy);
1126 destroy_workqueue(di->btemp_wq);
1130 static SIMPLE_DEV_PM_OPS(ab8500_btemp_pm_ops, ab8500_btemp_suspend, ab8500_btemp_resume);
1132 static const struct of_device_id ab8500_btemp_match[] = {
1133 { .compatible = "stericsson,ab8500-btemp", },
1137 static struct platform_driver ab8500_btemp_driver = {
1138 .probe = ab8500_btemp_probe,
1139 .remove = ab8500_btemp_remove,
1141 .name = "ab8500-btemp",
1142 .of_match_table = ab8500_btemp_match,
1143 .pm = &ab8500_btemp_pm_ops,
1147 static int __init ab8500_btemp_init(void)
1149 return platform_driver_register(&ab8500_btemp_driver);
1152 static void __exit ab8500_btemp_exit(void)
1154 platform_driver_unregister(&ab8500_btemp_driver);
1157 device_initcall(ab8500_btemp_init);
1158 module_exit(ab8500_btemp_exit);
1160 MODULE_LICENSE("GPL v2");
1161 MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
1162 MODULE_ALIAS("platform:ab8500-btemp");
1163 MODULE_DESCRIPTION("AB8500 battery temperature driver");