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/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>
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>
33 #include "ab8500-bm.h"
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
41 #define BTEMP_BATCTRL_CURR_SRC_7UA 7
42 #define BTEMP_BATCTRL_CURR_SRC_20UA 20
44 #define BTEMP_BATCTRL_CURR_SRC_16UA 16
45 #define BTEMP_BATCTRL_CURR_SRC_18UA 18
47 #define BTEMP_BATCTRL_CURR_SRC_60UA 60
48 #define BTEMP_BATCTRL_CURR_SRC_120UA 120
51 * struct ab8500_btemp_interrupts - ab8500 interrupts
52 * @name: name of the interrupt
53 * @isr function pointer to the isr
55 struct ab8500_btemp_interrupts {
57 irqreturn_t (*isr)(int irq, void *data);
60 struct ab8500_btemp_events {
70 struct ab8500_btemp_ranges {
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.
97 struct list_head node;
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;
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,
122 static LIST_HEAD(ab8500_btemp_list);
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
130 * This function returns the battery resistance that is
131 * derived from the BATCTRL voltage.
132 * Returns value in Ohms.
134 static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di,
135 int v_batctrl, int inst_curr)
137 if (is_ab8500_1p1_or_earlier(di->parent)) {
139 * For ABB cut1.0 and 1.1 BAT_CTRL is internally
140 * connected to 1.8V through a 450k resistor
142 return (450000 * (v_batctrl)) / (1800 - v_batctrl);
146 * BAT_CTRL is internally
147 * connected to 1.8V through a 80k resistor
149 return (80000 * (v_batctrl)) / (1800 - v_batctrl);
153 * ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage
154 * @di: pointer to the ab8500_btemp structure
156 * This function returns the voltage on BATCTRL. Returns value in mV.
158 static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp *di)
163 ret = iio_read_channel_processed(di->bat_ctrl, &vbtemp);
166 "%s ADC conversion failed, using previous value",
175 * ab8500_btemp_get_batctrl_res() - get battery resistance
176 * @di: pointer to the ab8500_btemp structure
178 * This function returns the battery pack identification resistance.
179 * Returns value in Ohms.
181 static int ab8500_btemp_get_batctrl_res(struct ab8500_btemp *di)
190 di->fg = ab8500_fg_get();
192 dev_err(di->dev, "No fg found\n");
196 ret = ab8500_fg_inst_curr_start(di->fg);
199 dev_err(di->dev, "Failed to start current measurement\n");
205 } while (!ab8500_fg_inst_curr_started(di->fg));
210 batctrl += ab8500_btemp_read_batctrl_voltage(di);
213 } while (!ab8500_fg_inst_curr_done(di->fg));
216 ret = ab8500_fg_inst_curr_finalize(di->fg, &inst_curr);
218 dev_err(di->dev, "Failed to finalize current measurement\n");
222 res = ab8500_btemp_batctrl_volt_to_res(di, batctrl, inst_curr);
224 dev_dbg(di->dev, "%s batctrl: %d res: %d inst_curr: %d samples: %d\n",
225 __func__, batctrl, res, inst_curr, i);
231 * ab8500_btemp_id() - Identify the connected battery
232 * @di: pointer to the ab8500_btemp structure
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.
238 static int ab8500_btemp_id(struct ab8500_btemp *di)
240 struct power_supply_battery_info *bi = di->bm->bi;
243 di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA;
245 res = ab8500_btemp_get_batctrl_res(di);
247 dev_err(di->dev, "%s get batctrl res failed\n", __func__);
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);
257 dev_warn(di->dev, "Battery identified as unknown"
258 ", resistance %d Ohm\n", res);
266 * ab8500_btemp_periodic_work() - Measuring the temperature periodically
267 * @work: pointer to the work_struct structure
269 * Work function for measuring the temperature periodically
271 static void ab8500_btemp_periodic_work(struct work_struct *work)
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;
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");
287 /* Failover if a reading is erroneous, use last meausurement */
288 ret = thermal_zone_get_temp(di->tz, &bat_temp);
290 dev_err(di->dev, "error reading temperature\n");
293 /* Convert from millicentigrades to centigrades */
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.
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);
310 } else if (bat_temp < di->prev_bat_temp) {
312 power_supply_changed(di->btemp_psy);
313 } else if (bat_temp > di->prev_bat_temp) {
315 power_supply_changed(di->btemp_psy);
317 di->prev_bat_temp = bat_temp;
319 if (di->events.ac_conn || di->events.usb_conn)
320 interval = di->bm->temp_interval_chg;
322 interval = di->bm->temp_interval_nochg;
324 /* Schedule a new measurement */
325 queue_delayed_work(di->btemp_wq,
326 &di->btemp_periodic_work,
327 round_jiffies(interval * HZ));
331 * ab8500_btemp_batctrlindb_handler() - battery removal detected
332 * @irq: interrupt number
333 * @_di: void pointer that has to address of ab8500_btemp
335 * Returns IRQ status(IRQ_HANDLED)
337 static irqreturn_t ab8500_btemp_batctrlindb_handler(int irq, void *_di)
339 struct ab8500_btemp *di = _di;
340 dev_err(di->dev, "Battery removal detected!\n");
342 di->events.batt_rem = true;
343 power_supply_changed(di->btemp_psy);
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
353 * Returns IRQ status(IRQ_HANDLED)
355 static irqreturn_t ab8500_btemp_templow_handler(int irq, void *_di)
357 struct ab8500_btemp *di = _di;
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");
363 dev_crit(di->dev, "Battery temperature lower than -10deg c\n");
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);
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
380 * Returns IRQ status(IRQ_HANDLED)
382 static irqreturn_t ab8500_btemp_temphigh_handler(int irq, void *_di)
384 struct ab8500_btemp *di = _di;
386 dev_crit(di->dev, "Battery temperature is higher than MAX temp\n");
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);
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
402 * Returns IRQ status(IRQ_HANDLED)
404 static irqreturn_t ab8500_btemp_lowmed_handler(int irq, void *_di)
406 struct ab8500_btemp *di = _di;
408 dev_dbg(di->dev, "Battery temperature is between low and medium\n");
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);
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
424 * Returns IRQ status(IRQ_HANDLED)
426 static irqreturn_t ab8500_btemp_medhigh_handler(int irq, void *_di)
428 struct ab8500_btemp *di = _di;
430 dev_dbg(di->dev, "Battery temperature is between medium and high\n");
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);
442 * ab8500_btemp_periodic() - Periodic temperature measurements
443 * @di: pointer to the ab8500_btemp structure
444 * @enable: enable or disable periodic temperature measurements
446 * Starts of stops periodic temperature measurements. Periodic measurements
447 * should only be done when a charger is connected.
449 static void ab8500_btemp_periodic(struct ab8500_btemp *di,
452 dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n",
455 * Make sure a new measurement is done directly by cancelling
458 cancel_delayed_work_sync(&di->btemp_periodic_work);
461 queue_delayed_work(di->btemp_wq, &di->btemp_periodic_work, 0);
465 * ab8500_btemp_get_temp() - get battery temperature
466 * @di: pointer to the ab8500_btemp structure
468 * Returns battery temperature
470 static int ab8500_btemp_get_temp(struct ab8500_btemp *di)
475 * The BTEMP events are not reliabe on AB8500 cut3.3
478 if (is_ab8500_3p3_or_earlier(di->parent)) {
479 temp = di->bat_temp * 10;
481 if (di->events.btemp_low) {
482 if (temp > di->btemp_ranges.btemp_low_limit)
483 temp = di->btemp_ranges.btemp_low_limit * 10;
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;
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;
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;
500 temp = di->bat_temp * 10;
502 temp = di->bat_temp * 10;
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
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)
521 static int ab8500_btemp_get_property(struct power_supply *psy,
522 enum power_supply_property psp,
523 union power_supply_propval *val)
525 struct ab8500_btemp *di = power_supply_get_drvdata(psy);
528 case POWER_SUPPLY_PROP_PRESENT:
529 case POWER_SUPPLY_PROP_ONLINE:
530 if (di->events.batt_rem)
535 case POWER_SUPPLY_PROP_TECHNOLOGY:
537 val->intval = di->bm->bi->technology;
539 val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
541 case POWER_SUPPLY_PROP_TEMP:
542 val->intval = ab8500_btemp_get_temp(di);
550 static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data)
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;
559 psy = (struct power_supply *)data;
560 di = power_supply_get_drvdata(psy);
563 * For all psy where the name of your driver
564 * appears in any supplied_to
566 j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
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];
575 if (power_supply_get_property(ext, prop, &ret))
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;
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);
593 case POWER_SUPPLY_TYPE_USB:
594 /* USB disconnected */
595 if (!ret.intval && di->events.usb_conn) {
596 di->events.usb_conn = false;
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);
617 * ab8500_btemp_external_power_changed() - callback for power supply changes
618 * @psy: pointer to the structure power_supply
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.
625 static void ab8500_btemp_external_power_changed(struct power_supply *psy)
627 class_for_each_device(power_supply_class, NULL, psy,
628 ab8500_btemp_get_ext_psy_data);
631 /* ab8500 btemp driver interrupts and their respective isr */
632 static struct ab8500_btemp_interrupts ab8500_btemp_irq[] = {
633 {"BAT_CTRL_INDB", ab8500_btemp_batctrlindb_handler},
634 {"BTEMP_LOW", ab8500_btemp_templow_handler},
635 {"BTEMP_HIGH", ab8500_btemp_temphigh_handler},
636 {"BTEMP_LOW_MEDIUM", ab8500_btemp_lowmed_handler},
637 {"BTEMP_MEDIUM_HIGH", ab8500_btemp_medhigh_handler},
640 static int __maybe_unused ab8500_btemp_resume(struct device *dev)
642 struct ab8500_btemp *di = dev_get_drvdata(dev);
644 ab8500_btemp_periodic(di, true);
649 static int __maybe_unused ab8500_btemp_suspend(struct device *dev)
651 struct ab8500_btemp *di = dev_get_drvdata(dev);
653 ab8500_btemp_periodic(di, false);
658 static char *supply_interface[] = {
663 static const struct power_supply_desc ab8500_btemp_desc = {
664 .name = "ab8500_btemp",
665 .type = POWER_SUPPLY_TYPE_BATTERY,
666 .properties = ab8500_btemp_props,
667 .num_properties = ARRAY_SIZE(ab8500_btemp_props),
668 .get_property = ab8500_btemp_get_property,
669 .external_power_changed = ab8500_btemp_external_power_changed,
672 static int ab8500_btemp_bind(struct device *dev, struct device *master,
675 struct ab8500_btemp *di = dev_get_drvdata(dev);
677 /* Create a work queue for the btemp */
679 alloc_workqueue("ab8500_btemp_wq", WQ_MEM_RECLAIM, 0);
680 if (di->btemp_wq == NULL) {
681 dev_err(dev, "failed to create work queue\n");
685 /* Kick off periodic temperature measurements */
686 ab8500_btemp_periodic(di, true);
691 static void ab8500_btemp_unbind(struct device *dev, struct device *master,
694 struct ab8500_btemp *di = dev_get_drvdata(dev);
696 /* Delete the work queue */
697 destroy_workqueue(di->btemp_wq);
700 static const struct component_ops ab8500_btemp_component_ops = {
701 .bind = ab8500_btemp_bind,
702 .unbind = ab8500_btemp_unbind,
705 static int ab8500_btemp_probe(struct platform_device *pdev)
707 struct power_supply_config psy_cfg = {};
708 struct device *dev = &pdev->dev;
709 struct ab8500_btemp *di;
713 di = devm_kzalloc(dev, sizeof(*di), GFP_KERNEL);
717 di->bm = &ab8500_bm_data;
719 /* get parent data */
721 di->parent = dev_get_drvdata(pdev->dev.parent);
723 /* Get thermal zone and ADC */
724 di->tz = thermal_zone_get_zone_by_name("battery-thermal");
725 if (IS_ERR(di->tz)) {
726 ret = PTR_ERR(di->tz);
728 * This usually just means we are probing before the thermal
729 * zone, so just defer.
733 return dev_err_probe(dev, ret,
734 "failed to get battery thermal zone\n");
736 di->bat_ctrl = devm_iio_channel_get(dev, "bat_ctrl");
737 if (IS_ERR(di->bat_ctrl)) {
738 ret = dev_err_probe(dev, PTR_ERR(di->bat_ctrl),
739 "failed to get BAT CTRL ADC channel\n");
743 di->initialized = false;
745 psy_cfg.supplied_to = supply_interface;
746 psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
747 psy_cfg.drv_data = di;
749 /* Init work for measuring temperature periodically */
750 INIT_DEFERRABLE_WORK(&di->btemp_periodic_work,
751 ab8500_btemp_periodic_work);
753 /* Set BTEMP thermal limits. Low and Med are fixed */
754 di->btemp_ranges.btemp_low_limit = BTEMP_THERMAL_LOW_LIMIT;
755 di->btemp_ranges.btemp_med_limit = BTEMP_THERMAL_MED_LIMIT;
757 ret = abx500_get_register_interruptible(dev, AB8500_CHARGER,
758 AB8500_BTEMP_HIGH_TH, &val);
760 dev_err(dev, "%s ab8500 read failed\n", __func__);
764 case BTEMP_HIGH_TH_57_0:
765 case BTEMP_HIGH_TH_57_1:
766 di->btemp_ranges.btemp_high_limit =
767 BTEMP_THERMAL_HIGH_LIMIT_57;
769 case BTEMP_HIGH_TH_52:
770 di->btemp_ranges.btemp_high_limit =
771 BTEMP_THERMAL_HIGH_LIMIT_52;
773 case BTEMP_HIGH_TH_62:
774 di->btemp_ranges.btemp_high_limit =
775 BTEMP_THERMAL_HIGH_LIMIT_62;
779 /* Register BTEMP power supply class */
780 di->btemp_psy = devm_power_supply_register(dev, &ab8500_btemp_desc,
782 if (IS_ERR(di->btemp_psy)) {
783 dev_err(dev, "failed to register BTEMP psy\n");
784 return PTR_ERR(di->btemp_psy);
787 /* Register interrupts */
788 for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
789 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
793 ret = devm_request_threaded_irq(dev, irq, NULL,
794 ab8500_btemp_irq[i].isr,
795 IRQF_SHARED | IRQF_NO_SUSPEND | IRQF_ONESHOT,
796 ab8500_btemp_irq[i].name, di);
799 dev_err(dev, "failed to request %s IRQ %d: %d\n"
800 , ab8500_btemp_irq[i].name, irq, ret);
803 dev_dbg(dev, "Requested %s IRQ %d: %d\n",
804 ab8500_btemp_irq[i].name, irq, ret);
807 platform_set_drvdata(pdev, di);
809 list_add_tail(&di->node, &ab8500_btemp_list);
811 return component_add(dev, &ab8500_btemp_component_ops);
814 static int ab8500_btemp_remove(struct platform_device *pdev)
816 component_del(&pdev->dev, &ab8500_btemp_component_ops);
821 static SIMPLE_DEV_PM_OPS(ab8500_btemp_pm_ops, ab8500_btemp_suspend, ab8500_btemp_resume);
823 static const struct of_device_id ab8500_btemp_match[] = {
824 { .compatible = "stericsson,ab8500-btemp", },
827 MODULE_DEVICE_TABLE(of, ab8500_btemp_match);
829 struct platform_driver ab8500_btemp_driver = {
830 .probe = ab8500_btemp_probe,
831 .remove = ab8500_btemp_remove,
833 .name = "ab8500-btemp",
834 .of_match_table = ab8500_btemp_match,
835 .pm = &ab8500_btemp_pm_ops,
838 MODULE_LICENSE("GPL v2");
839 MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
840 MODULE_ALIAS("platform:ab8500-btemp");
841 MODULE_DESCRIPTION("AB8500 battery temperature driver");