2 * Copyright (C) ST-Ericsson SA 2012
4 * Battery temperature driver for AB8500
6 * License Terms: GNU General Public License v2
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/mfd/abx500/ab8500-gpadc.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 to_ab8500_btemp_device_info(x) container_of((x), \
43 struct ab8500_btemp, btemp_psy);
46 * struct ab8500_btemp_interrupts - ab8500 interrupts
47 * @name: name of the interrupt
48 * @isr function pointer to the isr
50 struct ab8500_btemp_interrupts {
52 irqreturn_t (*isr)(int irq, void *data);
55 struct ab8500_btemp_events {
65 struct ab8500_btemp_ranges {
72 * struct ab8500_btemp - ab8500 BTEMP device information
73 * @dev: Pointer to the structure device
74 * @node: List of AB8500 BTEMPs, hence prepared for reentrance
75 * @curr_source: What current source we use, in uA
76 * @bat_temp: Battery temperature in degree Celcius
77 * @prev_bat_temp Last dispatched battery temperature
78 * @parent: Pointer to the struct ab8500
79 * @gpadc: Pointer to the struct gpadc
80 * @fg: Pointer to the struct fg
81 * @bat: Pointer to the abx500_bm platform data
82 * @btemp_psy: Structure for BTEMP specific battery properties
83 * @events: Structure for information about events triggered
84 * @btemp_ranges: Battery temperature range structure
85 * @btemp_wq: Work queue for measuring the temperature periodically
86 * @btemp_periodic_work: Work for measuring the temperature periodically
90 struct list_head node;
94 struct ab8500 *parent;
95 struct ab8500_gpadc *gpadc;
97 struct abx500_bm_data *bat;
98 struct power_supply btemp_psy;
99 struct ab8500_btemp_events events;
100 struct ab8500_btemp_ranges btemp_ranges;
101 struct workqueue_struct *btemp_wq;
102 struct delayed_work btemp_periodic_work;
105 /* BTEMP power supply properties */
106 static enum power_supply_property ab8500_btemp_props[] = {
107 POWER_SUPPLY_PROP_PRESENT,
108 POWER_SUPPLY_PROP_ONLINE,
109 POWER_SUPPLY_PROP_TECHNOLOGY,
110 POWER_SUPPLY_PROP_TEMP,
113 static LIST_HEAD(ab8500_btemp_list);
116 * ab8500_btemp_get() - returns a reference to the primary AB8500 BTEMP
117 * (i.e. the first BTEMP in the instance list)
119 struct ab8500_btemp *ab8500_btemp_get(void)
121 struct ab8500_btemp *btemp;
122 btemp = list_first_entry(&ab8500_btemp_list, struct ab8500_btemp, node);
128 * ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance
129 * @di: pointer to the ab8500_btemp structure
130 * @v_batctrl: measured batctrl voltage
131 * @inst_curr: measured instant current
133 * This function returns the battery resistance that is
134 * derived from the BATCTRL voltage.
135 * Returns value in Ohms.
137 static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di,
138 int v_batctrl, int inst_curr)
142 if (is_ab8500_1p1_or_earlier(di->parent)) {
144 * For ABB cut1.0 and 1.1 BAT_CTRL is internally
145 * connected to 1.8V through a 450k resistor
147 return (450000 * (v_batctrl)) / (1800 - v_batctrl);
150 if (di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL) {
152 * If the battery has internal NTC, we use the current
153 * source to calculate the resistance, 7uA or 20uA
155 rbs = (v_batctrl * 1000
156 - di->bat->gnd_lift_resistance * inst_curr)
160 * BAT_CTRL is internally
161 * connected to 1.8V through a 80k resistor
163 rbs = (80000 * (v_batctrl)) / (1800 - v_batctrl);
170 * ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage
171 * @di: pointer to the ab8500_btemp structure
173 * This function returns the voltage on BATCTRL. Returns value in mV.
175 static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp *di)
180 vbtemp = ab8500_gpadc_convert(di->gpadc, BAT_CTRL);
183 "%s gpadc conversion failed, using previous value",
192 * ab8500_btemp_curr_source_enable() - enable/disable batctrl current source
193 * @di: pointer to the ab8500_btemp structure
194 * @enable: enable or disable the current source
196 * Enable or disable the current sources for the BatCtrl AD channel
198 static int ab8500_btemp_curr_source_enable(struct ab8500_btemp *di,
205 * BATCTRL current sources are included on AB8500 cut2.0
206 * and future versions
208 if (is_ab8500_1p1_or_earlier(di->parent))
211 /* Only do this for batteries with internal NTC */
212 if (di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL && enable) {
213 if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_7UA)
214 curr = BAT_CTRL_7U_ENA;
216 curr = BAT_CTRL_20U_ENA;
218 dev_dbg(di->dev, "Set BATCTRL %duA\n", di->curr_source);
220 ret = abx500_mask_and_set_register_interruptible(di->dev,
221 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
222 FORCE_BAT_CTRL_CMP_HIGH, FORCE_BAT_CTRL_CMP_HIGH);
224 dev_err(di->dev, "%s failed setting cmp_force\n",
230 * We have to wait one 32kHz cycle before enabling
231 * the current source, since ForceBatCtrlCmpHigh needs
232 * to be written in a separate cycle
236 ret = abx500_set_register_interruptible(di->dev,
237 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
238 FORCE_BAT_CTRL_CMP_HIGH | curr);
240 dev_err(di->dev, "%s failed enabling current source\n",
242 goto disable_curr_source;
244 } else if (di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL && !enable) {
245 dev_dbg(di->dev, "Disable BATCTRL curr source\n");
247 /* Write 0 to the curr bits */
248 ret = abx500_mask_and_set_register_interruptible(di->dev,
249 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
250 BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
251 ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
253 dev_err(di->dev, "%s failed disabling current source\n",
255 goto disable_curr_source;
258 /* Enable Pull-Up and comparator */
259 ret = abx500_mask_and_set_register_interruptible(di->dev,
260 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
261 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
262 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
264 dev_err(di->dev, "%s failed enabling PU and comp\n",
270 * We have to wait one 32kHz cycle before disabling
271 * ForceBatCtrlCmpHigh since this needs to be written
272 * in a separate cycle
276 /* Disable 'force comparator' */
277 ret = abx500_mask_and_set_register_interruptible(di->dev,
278 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
279 FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
281 dev_err(di->dev, "%s failed disabling force comp\n",
283 goto disable_force_comp;
289 * We have to try unsetting FORCE_BAT_CTRL_CMP_HIGH one more time
290 * if we got an error above
293 /* Write 0 to the curr bits */
294 ret = abx500_mask_and_set_register_interruptible(di->dev,
295 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
296 BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
297 ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
299 dev_err(di->dev, "%s failed disabling current source\n",
304 /* Enable Pull-Up and comparator */
305 ret = abx500_mask_and_set_register_interruptible(di->dev,
306 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
307 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
308 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
310 dev_err(di->dev, "%s failed enabling PU and comp\n",
317 * We have to wait one 32kHz cycle before disabling
318 * ForceBatCtrlCmpHigh since this needs to be written
319 * in a separate cycle
323 /* Disable 'force comparator' */
324 ret = abx500_mask_and_set_register_interruptible(di->dev,
325 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
326 FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
328 dev_err(di->dev, "%s failed disabling force comp\n",
337 * ab8500_btemp_get_batctrl_res() - get battery resistance
338 * @di: pointer to the ab8500_btemp structure
340 * This function returns the battery pack identification resistance.
341 * Returns value in Ohms.
343 static int ab8500_btemp_get_batctrl_res(struct ab8500_btemp *di)
352 * BATCTRL current sources are included on AB8500 cut2.0
353 * and future versions
355 ret = ab8500_btemp_curr_source_enable(di, true);
357 dev_err(di->dev, "%s curr source enabled failed\n", __func__);
362 di->fg = ab8500_fg_get();
364 dev_err(di->dev, "No fg found\n");
368 ret = ab8500_fg_inst_curr_start(di->fg);
371 dev_err(di->dev, "Failed to start current measurement\n");
376 * Since there is no interrupt when current measurement is done,
377 * loop for over 250ms (250ms is one sample conversion time
378 * with 32.768 Khz RTC clock). Note that a stop time must be set
379 * since the ab8500_btemp_read_batctrl_voltage call can block and
380 * take an unknown amount of time to complete.
385 batctrl += ab8500_btemp_read_batctrl_voltage(di);
388 } while (!ab8500_fg_inst_curr_done(di->fg));
391 ret = ab8500_fg_inst_curr_finalize(di->fg, &inst_curr);
393 dev_err(di->dev, "Failed to finalize current measurement\n");
397 res = ab8500_btemp_batctrl_volt_to_res(di, batctrl, inst_curr);
399 ret = ab8500_btemp_curr_source_enable(di, false);
401 dev_err(di->dev, "%s curr source disable failed\n", __func__);
405 dev_dbg(di->dev, "%s batctrl: %d res: %d inst_curr: %d samples: %d\n",
406 __func__, batctrl, res, inst_curr, i);
412 * ab8500_btemp_res_to_temp() - resistance to temperature
413 * @di: pointer to the ab8500_btemp structure
414 * @tbl: pointer to the resiatance to temperature table
415 * @tbl_size: size of the resistance to temperature table
416 * @res: resistance to calculate the temperature from
418 * This function returns the battery temperature in degrees Celcius
419 * based on the NTC resistance.
421 static int ab8500_btemp_res_to_temp(struct ab8500_btemp *di,
422 const struct abx500_res_to_temp *tbl, int tbl_size, int res)
426 * Calculate the formula for the straight line
427 * Simple interpolation if we are within
428 * the resistance table limits, extrapolate
429 * if resistance is outside the limits.
431 if (res > tbl[0].resist)
433 else if (res <= tbl[tbl_size - 1].resist)
437 while (!(res <= tbl[i].resist &&
438 res > tbl[i + 1].resist))
442 temp = tbl[i].temp + ((tbl[i + 1].temp - tbl[i].temp) *
443 (res - tbl[i].resist)) / (tbl[i + 1].resist - tbl[i].resist);
448 * ab8500_btemp_measure_temp() - measure battery temperature
449 * @di: pointer to the ab8500_btemp structure
451 * Returns battery temperature (on success) else the previous temperature
453 static int ab8500_btemp_measure_temp(struct ab8500_btemp *di)
457 int rbat, rntc, vntc;
460 id = di->bat->batt_id;
462 if (di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL &&
463 id != BATTERY_UNKNOWN) {
465 rbat = ab8500_btemp_get_batctrl_res(di);
467 dev_err(di->dev, "%s get batctrl res failed\n",
470 * Return out-of-range temperature so that
471 * charging is stopped
473 return BTEMP_THERMAL_LOW_LIMIT;
476 temp = ab8500_btemp_res_to_temp(di,
477 di->bat->bat_type[id].r_to_t_tbl,
478 di->bat->bat_type[id].n_temp_tbl_elements, rbat);
480 vntc = ab8500_gpadc_convert(di->gpadc, BTEMP_BALL);
483 "%s gpadc conversion failed,"
484 " using previous value\n", __func__);
488 * The PCB NTC is sourced from VTVOUT via a 230kOhm
491 rntc = 230000 * vntc / (VTVOUT_V - vntc);
493 temp = ab8500_btemp_res_to_temp(di,
494 di->bat->bat_type[id].r_to_t_tbl,
495 di->bat->bat_type[id].n_temp_tbl_elements, rntc);
498 dev_dbg(di->dev, "Battery temperature is %d\n", temp);
503 * ab8500_btemp_id() - Identify the connected battery
504 * @di: pointer to the ab8500_btemp structure
506 * This function will try to identify the battery by reading the ID
507 * resistor. Some brands use a combined ID resistor with a NTC resistor to
508 * both be able to identify and to read the temperature of it.
510 static int ab8500_btemp_id(struct ab8500_btemp *di)
515 di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA;
516 di->bat->batt_id = BATTERY_UNKNOWN;
518 res = ab8500_btemp_get_batctrl_res(di);
520 dev_err(di->dev, "%s get batctrl res failed\n", __func__);
524 /* BATTERY_UNKNOWN is defined on position 0, skip it! */
525 for (i = BATTERY_UNKNOWN + 1; i < di->bat->n_btypes; i++) {
526 if ((res <= di->bat->bat_type[i].resis_high) &&
527 (res >= di->bat->bat_type[i].resis_low)) {
528 dev_dbg(di->dev, "Battery detected on %s"
529 " low %d < res %d < high: %d"
531 di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL ?
532 "BATCTRL" : "BATTEMP",
533 di->bat->bat_type[i].resis_low, res,
534 di->bat->bat_type[i].resis_high, i);
536 di->bat->batt_id = i;
541 if (di->bat->batt_id == BATTERY_UNKNOWN) {
542 dev_warn(di->dev, "Battery identified as unknown"
543 ", resistance %d Ohm\n", res);
548 * We only have to change current source if the
549 * detected type is Type 1, else we use the 7uA source
551 if (di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL &&
552 di->bat->batt_id == 1) {
553 dev_dbg(di->dev, "Set BATCTRL current source to 20uA\n");
554 di->curr_source = BTEMP_BATCTRL_CURR_SRC_20UA;
557 return di->bat->batt_id;
561 * ab8500_btemp_periodic_work() - Measuring the temperature periodically
562 * @work: pointer to the work_struct structure
564 * Work function for measuring the temperature periodically
566 static void ab8500_btemp_periodic_work(struct work_struct *work)
569 struct ab8500_btemp *di = container_of(work,
570 struct ab8500_btemp, btemp_periodic_work.work);
572 di->bat_temp = ab8500_btemp_measure_temp(di);
574 if (di->bat_temp != di->prev_bat_temp) {
575 di->prev_bat_temp = di->bat_temp;
576 power_supply_changed(&di->btemp_psy);
579 if (di->events.ac_conn || di->events.usb_conn)
580 interval = di->bat->temp_interval_chg;
582 interval = di->bat->temp_interval_nochg;
584 /* Schedule a new measurement */
585 queue_delayed_work(di->btemp_wq,
586 &di->btemp_periodic_work,
587 round_jiffies(interval * HZ));
591 * ab8500_btemp_batctrlindb_handler() - battery removal detected
592 * @irq: interrupt number
593 * @_di: void pointer that has to address of ab8500_btemp
595 * Returns IRQ status(IRQ_HANDLED)
597 static irqreturn_t ab8500_btemp_batctrlindb_handler(int irq, void *_di)
599 struct ab8500_btemp *di = _di;
600 dev_err(di->dev, "Battery removal detected!\n");
602 di->events.batt_rem = true;
603 power_supply_changed(&di->btemp_psy);
609 * ab8500_btemp_templow_handler() - battery temp lower than 10 degrees
610 * @irq: interrupt number
611 * @_di: void pointer that has to address of ab8500_btemp
613 * Returns IRQ status(IRQ_HANDLED)
615 static irqreturn_t ab8500_btemp_templow_handler(int irq, void *_di)
617 struct ab8500_btemp *di = _di;
619 if (is_ab8500_2p0_or_earlier(di->parent)) {
620 dev_dbg(di->dev, "Ignore false btemp low irq"
621 " for ABB cut 1.0, 1.1 and 2.0\n");
623 dev_crit(di->dev, "Battery temperature lower than -10deg c\n");
625 di->events.btemp_low = true;
626 di->events.btemp_high = false;
627 di->events.btemp_medhigh = false;
628 di->events.btemp_lowmed = false;
629 power_supply_changed(&di->btemp_psy);
636 * ab8500_btemp_temphigh_handler() - battery temp higher than max temp
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_temphigh_handler(int irq, void *_di)
644 struct ab8500_btemp *di = _di;
646 dev_crit(di->dev, "Battery temperature is higher than MAX temp\n");
648 di->events.btemp_high = true;
649 di->events.btemp_medhigh = false;
650 di->events.btemp_lowmed = false;
651 di->events.btemp_low = false;
652 power_supply_changed(&di->btemp_psy);
658 * ab8500_btemp_lowmed_handler() - battery temp between low and medium
659 * @irq: interrupt number
660 * @_di: void pointer that has to address of ab8500_btemp
662 * Returns IRQ status(IRQ_HANDLED)
664 static irqreturn_t ab8500_btemp_lowmed_handler(int irq, void *_di)
666 struct ab8500_btemp *di = _di;
668 dev_dbg(di->dev, "Battery temperature is between low and medium\n");
670 di->events.btemp_lowmed = true;
671 di->events.btemp_medhigh = false;
672 di->events.btemp_high = false;
673 di->events.btemp_low = false;
674 power_supply_changed(&di->btemp_psy);
680 * ab8500_btemp_medhigh_handler() - battery temp between medium and high
681 * @irq: interrupt number
682 * @_di: void pointer that has to address of ab8500_btemp
684 * Returns IRQ status(IRQ_HANDLED)
686 static irqreturn_t ab8500_btemp_medhigh_handler(int irq, void *_di)
688 struct ab8500_btemp *di = _di;
690 dev_dbg(di->dev, "Battery temperature is between medium and high\n");
692 di->events.btemp_medhigh = true;
693 di->events.btemp_lowmed = false;
694 di->events.btemp_high = false;
695 di->events.btemp_low = false;
696 power_supply_changed(&di->btemp_psy);
702 * ab8500_btemp_periodic() - Periodic temperature measurements
703 * @di: pointer to the ab8500_btemp structure
704 * @enable: enable or disable periodic temperature measurements
706 * Starts of stops periodic temperature measurements. Periodic measurements
707 * should only be done when a charger is connected.
709 static void ab8500_btemp_periodic(struct ab8500_btemp *di,
712 dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n",
715 * Make sure a new measurement is done directly by cancelling
718 cancel_delayed_work_sync(&di->btemp_periodic_work);
721 queue_delayed_work(di->btemp_wq, &di->btemp_periodic_work, 0);
725 * ab8500_btemp_get_temp() - get battery temperature
726 * @di: pointer to the ab8500_btemp structure
728 * Returns battery temperature
730 static int ab8500_btemp_get_temp(struct ab8500_btemp *di)
735 * The BTEMP events are not reliabe on AB8500 cut2.0
738 if (is_ab8500_2p0_or_earlier(di->parent)) {
739 temp = di->bat_temp * 10;
741 if (di->events.btemp_low) {
742 if (temp > di->btemp_ranges.btemp_low_limit)
743 temp = di->btemp_ranges.btemp_low_limit;
745 temp = di->bat_temp * 10;
746 } else if (di->events.btemp_high) {
747 if (temp < di->btemp_ranges.btemp_high_limit)
748 temp = di->btemp_ranges.btemp_high_limit;
750 temp = di->bat_temp * 10;
751 } else if (di->events.btemp_lowmed) {
752 if (temp > di->btemp_ranges.btemp_med_limit)
753 temp = di->btemp_ranges.btemp_med_limit;
755 temp = di->bat_temp * 10;
756 } else if (di->events.btemp_medhigh) {
757 if (temp < di->btemp_ranges.btemp_med_limit)
758 temp = di->btemp_ranges.btemp_med_limit;
760 temp = di->bat_temp * 10;
762 temp = di->bat_temp * 10;
768 * ab8500_btemp_get_batctrl_temp() - get the temperature
769 * @btemp: pointer to the btemp structure
771 * Returns the batctrl temperature in millidegrees
773 int ab8500_btemp_get_batctrl_temp(struct ab8500_btemp *btemp)
775 return btemp->bat_temp * 1000;
779 * ab8500_btemp_get_property() - get the btemp properties
780 * @psy: pointer to the power_supply structure
781 * @psp: pointer to the power_supply_property structure
782 * @val: pointer to the power_supply_propval union
784 * This function gets called when an application tries to get the btemp
785 * properties by reading the sysfs files.
786 * online: presence of the battery
787 * present: presence of the battery
788 * technology: battery technology
789 * temp: battery temperature
790 * Returns error code in case of failure else 0(on success)
792 static int ab8500_btemp_get_property(struct power_supply *psy,
793 enum power_supply_property psp,
794 union power_supply_propval *val)
796 struct ab8500_btemp *di;
798 di = to_ab8500_btemp_device_info(psy);
801 case POWER_SUPPLY_PROP_PRESENT:
802 case POWER_SUPPLY_PROP_ONLINE:
803 if (di->events.batt_rem)
808 case POWER_SUPPLY_PROP_TECHNOLOGY:
809 val->intval = di->bat->bat_type[di->bat->batt_id].name;
811 case POWER_SUPPLY_PROP_TEMP:
812 val->intval = ab8500_btemp_get_temp(di);
820 static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data)
822 struct power_supply *psy;
823 struct power_supply *ext;
824 struct ab8500_btemp *di;
825 union power_supply_propval ret;
827 bool psy_found = false;
829 psy = (struct power_supply *)data;
830 ext = dev_get_drvdata(dev);
831 di = to_ab8500_btemp_device_info(psy);
834 * For all psy where the name of your driver
835 * appears in any supplied_to
837 for (i = 0; i < ext->num_supplicants; i++) {
838 if (!strcmp(ext->supplied_to[i], psy->name))
845 /* Go through all properties for the psy */
846 for (j = 0; j < ext->num_properties; j++) {
847 enum power_supply_property prop;
848 prop = ext->properties[j];
850 if (ext->get_property(ext, prop, &ret))
854 case POWER_SUPPLY_PROP_PRESENT:
856 case POWER_SUPPLY_TYPE_MAINS:
857 /* AC disconnected */
858 if (!ret.intval && di->events.ac_conn) {
859 di->events.ac_conn = false;
862 else if (ret.intval && !di->events.ac_conn) {
863 di->events.ac_conn = true;
864 if (!di->events.usb_conn)
865 ab8500_btemp_periodic(di, true);
868 case POWER_SUPPLY_TYPE_USB:
869 /* USB disconnected */
870 if (!ret.intval && di->events.usb_conn) {
871 di->events.usb_conn = false;
874 else if (ret.intval && !di->events.usb_conn) {
875 di->events.usb_conn = true;
876 if (!di->events.ac_conn)
877 ab8500_btemp_periodic(di, true);
892 * ab8500_btemp_external_power_changed() - callback for power supply changes
893 * @psy: pointer to the structure power_supply
895 * This function is pointing to the function pointer external_power_changed
896 * of the structure power_supply.
897 * This function gets executed when there is a change in the external power
898 * supply to the btemp.
900 static void ab8500_btemp_external_power_changed(struct power_supply *psy)
902 struct ab8500_btemp *di = to_ab8500_btemp_device_info(psy);
904 class_for_each_device(power_supply_class, NULL,
905 &di->btemp_psy, ab8500_btemp_get_ext_psy_data);
908 /* ab8500 btemp driver interrupts and their respective isr */
909 static struct ab8500_btemp_interrupts ab8500_btemp_irq[] = {
910 {"BAT_CTRL_INDB", ab8500_btemp_batctrlindb_handler},
911 {"BTEMP_LOW", ab8500_btemp_templow_handler},
912 {"BTEMP_HIGH", ab8500_btemp_temphigh_handler},
913 {"BTEMP_LOW_MEDIUM", ab8500_btemp_lowmed_handler},
914 {"BTEMP_MEDIUM_HIGH", ab8500_btemp_medhigh_handler},
917 #if defined(CONFIG_PM)
918 static int ab8500_btemp_resume(struct platform_device *pdev)
920 struct ab8500_btemp *di = platform_get_drvdata(pdev);
922 ab8500_btemp_periodic(di, true);
927 static int ab8500_btemp_suspend(struct platform_device *pdev,
930 struct ab8500_btemp *di = platform_get_drvdata(pdev);
932 ab8500_btemp_periodic(di, false);
937 #define ab8500_btemp_suspend NULL
938 #define ab8500_btemp_resume NULL
941 static int ab8500_btemp_remove(struct platform_device *pdev)
943 struct ab8500_btemp *di = platform_get_drvdata(pdev);
946 /* Disable interrupts */
947 for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
948 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
952 /* Delete the work queue */
953 destroy_workqueue(di->btemp_wq);
955 flush_scheduled_work();
956 power_supply_unregister(&di->btemp_psy);
957 platform_set_drvdata(pdev, NULL);
962 static char *supply_interface[] = {
967 static int ab8500_btemp_probe(struct platform_device *pdev)
969 struct device_node *np = pdev->dev.of_node;
970 struct ab8500_btemp *di;
974 di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
976 dev_err(&pdev->dev, "%s no mem for ab8500_btemp\n", __func__);
979 di->bat = pdev->mfd_cell->platform_data;
982 ret = bmdevs_of_probe(&pdev->dev, np, &di->bat);
985 "failed to get battery information\n");
989 dev_err(&pdev->dev, "missing dt node for ab8500_btemp\n");
993 dev_info(&pdev->dev, "falling back to legacy platform data\n");
996 /* get parent data */
997 di->dev = &pdev->dev;
998 di->parent = dev_get_drvdata(pdev->dev.parent);
999 di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
1002 di->btemp_psy.name = "ab8500_btemp";
1003 di->btemp_psy.type = POWER_SUPPLY_TYPE_BATTERY;
1004 di->btemp_psy.properties = ab8500_btemp_props;
1005 di->btemp_psy.num_properties = ARRAY_SIZE(ab8500_btemp_props);
1006 di->btemp_psy.get_property = ab8500_btemp_get_property;
1007 di->btemp_psy.supplied_to = supply_interface;
1008 di->btemp_psy.num_supplicants = ARRAY_SIZE(supply_interface);
1009 di->btemp_psy.external_power_changed =
1010 ab8500_btemp_external_power_changed;
1013 /* Create a work queue for the btemp */
1015 create_singlethread_workqueue("ab8500_btemp_wq");
1016 if (di->btemp_wq == NULL) {
1017 dev_err(di->dev, "failed to create work queue\n");
1021 /* Init work for measuring temperature periodically */
1022 INIT_DEFERRABLE_WORK(&di->btemp_periodic_work,
1023 ab8500_btemp_periodic_work);
1025 /* Identify the battery */
1026 if (ab8500_btemp_id(di) < 0)
1027 dev_warn(di->dev, "failed to identify the battery\n");
1029 /* Set BTEMP thermal limits. Low and Med are fixed */
1030 di->btemp_ranges.btemp_low_limit = BTEMP_THERMAL_LOW_LIMIT;
1031 di->btemp_ranges.btemp_med_limit = BTEMP_THERMAL_MED_LIMIT;
1033 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1034 AB8500_BTEMP_HIGH_TH, &val);
1036 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1040 case BTEMP_HIGH_TH_57_0:
1041 case BTEMP_HIGH_TH_57_1:
1042 di->btemp_ranges.btemp_high_limit =
1043 BTEMP_THERMAL_HIGH_LIMIT_57;
1045 case BTEMP_HIGH_TH_52:
1046 di->btemp_ranges.btemp_high_limit =
1047 BTEMP_THERMAL_HIGH_LIMIT_52;
1049 case BTEMP_HIGH_TH_62:
1050 di->btemp_ranges.btemp_high_limit =
1051 BTEMP_THERMAL_HIGH_LIMIT_62;
1055 /* Register BTEMP power supply class */
1056 ret = power_supply_register(di->dev, &di->btemp_psy);
1058 dev_err(di->dev, "failed to register BTEMP psy\n");
1062 /* Register interrupts */
1063 for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
1064 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1065 ret = request_threaded_irq(irq, NULL, ab8500_btemp_irq[i].isr,
1066 IRQF_SHARED | IRQF_NO_SUSPEND,
1067 ab8500_btemp_irq[i].name, di);
1070 dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
1071 , ab8500_btemp_irq[i].name, irq, ret);
1074 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
1075 ab8500_btemp_irq[i].name, irq, ret);
1078 platform_set_drvdata(pdev, di);
1080 /* Kick off periodic temperature measurements */
1081 ab8500_btemp_periodic(di, true);
1082 list_add_tail(&di->node, &ab8500_btemp_list);
1087 power_supply_unregister(&di->btemp_psy);
1089 /* We also have to free all successfully registered irqs */
1090 for (i = i - 1; i >= 0; i--) {
1091 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1095 destroy_workqueue(di->btemp_wq);
1099 static const struct of_device_id ab8500_btemp_match[] = {
1100 { .compatible = "stericsson,ab8500-btemp", },
1104 static struct platform_driver ab8500_btemp_driver = {
1105 .probe = ab8500_btemp_probe,
1106 .remove = ab8500_btemp_remove,
1107 .suspend = ab8500_btemp_suspend,
1108 .resume = ab8500_btemp_resume,
1110 .name = "ab8500-btemp",
1111 .owner = THIS_MODULE,
1112 .of_match_table = ab8500_btemp_match,
1116 static int __init ab8500_btemp_init(void)
1118 return platform_driver_register(&ab8500_btemp_driver);
1121 static void __exit ab8500_btemp_exit(void)
1123 platform_driver_unregister(&ab8500_btemp_driver);
1126 subsys_initcall_sync(ab8500_btemp_init);
1127 module_exit(ab8500_btemp_exit);
1129 MODULE_LICENSE("GPL v2");
1130 MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
1131 MODULE_ALIAS("platform:ab8500-btemp");
1132 MODULE_DESCRIPTION("AB8500 battery temperature driver");