1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (C) ST-Ericsson SA 2012
5  * Battery temperature driver for AB8500
31 #include <linux/fixp-arith.h>
33 #include "ab8500-bm.h"
35 #define BTEMP_THERMAL_LOW_LIMIT		-10
51  * struct ab8500_btemp_interrupts - ab8500 interrupts
77  * struct ab8500_btemp - ab8500 BTEMP device information
81  * @bat_temp:		Dispatched battery temperature in degree Celsius
82  * @prev_bat_temp	Last measured battery temperature in degree Celsius
84  * @tz:			Thermal zone for the battery
85  * @adc_bat_ctrl:	ADC channel for the battery control
87  * @bm:           	Platform specific battery management information
88  * @btemp_psy:		Structure for BTEMP specific battery properties
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.
124  * ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance
129  * This function returns the battery resistance that is
136 	if (is_ab8500_1p1_or_earlier(di->parent)) {  in ab8500_btemp_batctrl_volt_to_res()
141 		return (450000 * (v_batctrl)) / (1800 - v_batctrl);  in ab8500_btemp_batctrl_volt_to_res()
148 	return (80000 * (v_batctrl)) / (1800 - v_batctrl);  in ab8500_btemp_batctrl_volt_to_res()
152  * ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage
162 	ret = iio_read_channel_processed(di->bat_ctrl, &vbtemp);  in ab8500_btemp_read_batctrl_voltage()
164 		dev_err(di->dev,  in ab8500_btemp_read_batctrl_voltage()
174  * ab8500_btemp_get_batctrl_res() - get battery resistance
177  * This function returns the battery pack identification resistance.
188 	if (!di->fg)  in ab8500_btemp_get_batctrl_res()
189 		di->fg = ab8500_fg_get();  in ab8500_btemp_get_batctrl_res()
190 	if (!di->fg) {  in ab8500_btemp_get_batctrl_res()
191 		dev_err(di->dev, "No fg found\n");  in ab8500_btemp_get_batctrl_res()
192 		return -EINVAL;  in ab8500_btemp_get_batctrl_res()
195 	ret = ab8500_fg_inst_curr_start(di->fg);  in ab8500_btemp_get_batctrl_res()
198 		dev_err(di->dev, "Failed to start current measurement\n");  in ab8500_btemp_get_batctrl_res()
204 	} while (!ab8500_fg_inst_curr_started(di->fg));  in ab8500_btemp_get_batctrl_res()
212 	} while (!ab8500_fg_inst_curr_done(di->fg));  in ab8500_btemp_get_batctrl_res()
215 	ret = ab8500_fg_inst_curr_finalize(di->fg, &inst_curr);  in ab8500_btemp_get_batctrl_res()
217 		dev_err(di->dev, "Failed to finalize current measurement\n");  in ab8500_btemp_get_batctrl_res()
223 	dev_dbg(di->dev, "%s batctrl: %d res: %d inst_curr: %d samples: %d\n",  in ab8500_btemp_get_batctrl_res()
230  * ab8500_btemp_id() - Identify the connected battery
233  * This function will try to identify the battery by reading the ID
235  * both be able to identify and to read the temperature of it.
239 	struct power_supply_battery_info *bi = di->bm->bi;  in ab8500_btemp_id()
242 	di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA;  in ab8500_btemp_id()
246 		dev_err(di->dev, "%s get batctrl res failed\n", __func__);  in ab8500_btemp_id()
247 		return -ENXIO;  in ab8500_btemp_id()
251 		dev_info(di->dev, "Battery detected on BATCTRL (pin C3)"  in ab8500_btemp_id()
252 			 " resistance %d Ohm = %d Ohm +/- %d%%\n",  in ab8500_btemp_id()
253 			 res, bi->bti_resistance_ohm,  in ab8500_btemp_id()
254 			 bi->bti_resistance_tolerance);  in ab8500_btemp_id()
256 		dev_warn(di->dev, "Battery identified as unknown"  in ab8500_btemp_id()
258 		return -ENXIO;  in ab8500_btemp_id()
265  * ab8500_btemp_periodic_work() - Measuring the temperature periodically
268  * Work function for measuring the temperature periodically
276 	/* Assume 25 degrees celsius as start temperature */  in ab8500_btemp_periodic_work()
280 	if (!di->initialized) {  in ab8500_btemp_periodic_work()
281 		/* Identify the battery */  in ab8500_btemp_periodic_work()
283 			dev_warn(di->dev, "failed to identify the battery\n");  in ab8500_btemp_periodic_work()
287 	ret = thermal_zone_get_temp(di->tz, &bat_temp);  in ab8500_btemp_periodic_work()
289 		dev_err(di->dev, "error reading temperature\n");  in ab8500_btemp_periodic_work()
298 	 * Filter battery temperature.  in ab8500_btemp_periodic_work()
299 	 * Allow direct updates on temperature only if two samples result in  in ab8500_btemp_periodic_work()
300 	 * same temperature. Else only allow 1 degree change from previous  in ab8500_btemp_periodic_work()
303 	if ((bat_temp == di->prev_bat_temp) || !di->initialized) {  in ab8500_btemp_periodic_work()
304 		if ((di->bat_temp != di->prev_bat_temp) || !di->initialized) {  in ab8500_btemp_periodic_work()
305 			di->initialized = true;  in ab8500_btemp_periodic_work()
306 			di->bat_temp = bat_temp;  in ab8500_btemp_periodic_work()
307 			power_supply_changed(di->btemp_psy);  in ab8500_btemp_periodic_work()
309 	} else if (bat_temp < di->prev_bat_temp) {  in ab8500_btemp_periodic_work()
310 		di->bat_temp--;  in ab8500_btemp_periodic_work()
311 		power_supply_changed(di->btemp_psy);  in ab8500_btemp_periodic_work()
312 	} else if (bat_temp > di->prev_bat_temp) {  in ab8500_btemp_periodic_work()
313 		di->bat_temp++;  in ab8500_btemp_periodic_work()
314 		power_supply_changed(di->btemp_psy);  in ab8500_btemp_periodic_work()
316 	di->prev_bat_temp = bat_temp;  in ab8500_btemp_periodic_work()
318 	if (di->events.ac_conn || di->events.usb_conn)  in ab8500_btemp_periodic_work()
319 		interval = di->bm->temp_interval_chg;  in ab8500_btemp_periodic_work()
321 		interval = di->bm->temp_interval_nochg;  in ab8500_btemp_periodic_work()
324 	queue_delayed_work(di->btemp_wq,  in ab8500_btemp_periodic_work()
325 		&di->btemp_periodic_work,  in ab8500_btemp_periodic_work()
330  * ab8500_btemp_batctrlindb_handler() - battery removal detected
339 	dev_err(di->dev, "Battery removal detected!\n");  in ab8500_btemp_batctrlindb_handler()
341 	di->events.batt_rem = true;  in ab8500_btemp_batctrlindb_handler()
342 	power_supply_changed(di->btemp_psy);  in ab8500_btemp_batctrlindb_handler()
348  * ab8500_btemp_templow_handler() - battery temp lower than 10 degrees
358 	if (is_ab8500_3p3_or_earlier(di->parent)) {  in ab8500_btemp_templow_handler()
359 		dev_dbg(di->dev, "Ignore false btemp low irq"  in ab8500_btemp_templow_handler()
362 		dev_crit(di->dev, "Battery temperature lower than -10deg c\n");  in ab8500_btemp_templow_handler()
364 		di->events.btemp_low = true;  in ab8500_btemp_templow_handler()
365 		di->events.btemp_high = false;  in ab8500_btemp_templow_handler()
366 		di->events.btemp_medhigh = false;  in ab8500_btemp_templow_handler()
367 		di->events.btemp_lowmed = false;  in ab8500_btemp_templow_handler()
368 		power_supply_changed(di->btemp_psy);  in ab8500_btemp_templow_handler()
375  * ab8500_btemp_temphigh_handler() - battery temp higher than max temp
385 	dev_crit(di->dev, "Battery temperature is higher than MAX temp\n");  in ab8500_btemp_temphigh_handler()
387 	di->events.btemp_high = true;  in ab8500_btemp_temphigh_handler()
388 	di->events.btemp_medhigh = false;  in ab8500_btemp_temphigh_handler()
389 	di->events.btemp_lowmed = false;  in ab8500_btemp_temphigh_handler()
390 	di->events.btemp_low = false;  in ab8500_btemp_temphigh_handler()
391 	power_supply_changed(di->btemp_psy);  in ab8500_btemp_temphigh_handler()
397  * ab8500_btemp_lowmed_handler() - battery temp between low and medium
407 	dev_dbg(di->dev, "Battery temperature is between low and medium\n");  in ab8500_btemp_lowmed_handler()
409 	di->events.btemp_lowmed = true;  in ab8500_btemp_lowmed_handler()
410 	di->events.btemp_medhigh = false;  in ab8500_btemp_lowmed_handler()
411 	di->events.btemp_high = false;  in ab8500_btemp_lowmed_handler()
412 	di->events.btemp_low = false;  in ab8500_btemp_lowmed_handler()
413 	power_supply_changed(di->btemp_psy);  in ab8500_btemp_lowmed_handler()
419  * ab8500_btemp_medhigh_handler() - battery temp between medium and high
429 	dev_dbg(di->dev, "Battery temperature is between medium and high\n");  in ab8500_btemp_medhigh_handler()
431 	di->events.btemp_medhigh = true;  in ab8500_btemp_medhigh_handler()
432 	di->events.btemp_lowmed = false;  in ab8500_btemp_medhigh_handler()
433 	di->events.btemp_high = false;  in ab8500_btemp_medhigh_handler()
434 	di->events.btemp_low = false;  in ab8500_btemp_medhigh_handler()
435 	power_supply_changed(di->btemp_psy);  in ab8500_btemp_medhigh_handler()
441  * ab8500_btemp_periodic() - Periodic temperature measurements
443  * @enable:	enable or disable periodic temperature measurements
445  * Starts of stops periodic temperature measurements. Periodic measurements
451 	dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n",  in ab8500_btemp_periodic()
457 	cancel_delayed_work_sync(&di->btemp_periodic_work);  in ab8500_btemp_periodic()
460 		queue_delayed_work(di->btemp_wq, &di->btemp_periodic_work, 0);  in ab8500_btemp_periodic()
464  * ab8500_btemp_get_temp() - get battery temperature
467  * Returns battery temperature
477 	if (is_ab8500_3p3_or_earlier(di->parent)) {  in ab8500_btemp_get_temp()
478 		temp = di->bat_temp * 10;  in ab8500_btemp_get_temp()
480 		if (di->events.btemp_low) {  in ab8500_btemp_get_temp()
481 			if (temp > di->btemp_ranges.btemp_low_limit)  in ab8500_btemp_get_temp()
482 				temp = di->btemp_ranges.btemp_low_limit * 10;  in ab8500_btemp_get_temp()
484 				temp = di->bat_temp * 10;  in ab8500_btemp_get_temp()
485 		} else if (di->events.btemp_high) {  in ab8500_btemp_get_temp()
486 			if (temp < di->btemp_ranges.btemp_high_limit)  in ab8500_btemp_get_temp()
487 				temp = di->btemp_ranges.btemp_high_limit * 10;  in ab8500_btemp_get_temp()
489 				temp = di->bat_temp * 10;  in ab8500_btemp_get_temp()
490 		} else if (di->events.btemp_lowmed) {  in ab8500_btemp_get_temp()
491 			if (temp > di->btemp_ranges.btemp_med_limit)  in ab8500_btemp_get_temp()
492 				temp = di->btemp_ranges.btemp_med_limit * 10;  in ab8500_btemp_get_temp()
494 				temp = di->bat_temp * 10;  in ab8500_btemp_get_temp()
495 		} else if (di->events.btemp_medhigh) {  in ab8500_btemp_get_temp()
496 			if (temp < di->btemp_ranges.btemp_med_limit)  in ab8500_btemp_get_temp()
497 				temp = di->btemp_ranges.btemp_med_limit * 10;  in ab8500_btemp_get_temp()
499 				temp = di->bat_temp * 10;  in ab8500_btemp_get_temp()
501 			temp = di->bat_temp * 10;  in ab8500_btemp_get_temp()
507  * ab8500_btemp_get_property() - get the btemp properties
514  * online:	presence of the battery
515  * present:	presence of the battery
516  * technology:	battery technology
517  * temp:	battery temperature
529 		if (di->events.batt_rem)  in ab8500_btemp_get_property()
530 			val->intval = 0;  in ab8500_btemp_get_property()
532 			val->intval = 1;  in ab8500_btemp_get_property()
535 		val->intval = ab8500_btemp_get_temp(di);  in ab8500_btemp_get_property()
538 		return -EINVAL;  in ab8500_btemp_get_property()
547 	const char **supplicants = (const char **)ext->supplied_to;  in ab8500_btemp_get_ext_psy_data()
559 	j = match_string(supplicants, ext->num_supplicants, psy->desc->name);  in ab8500_btemp_get_ext_psy_data()
564 	for (j = 0; j < ext->desc->num_properties; j++) {  in ab8500_btemp_get_ext_psy_data()
566 		prop = ext->desc->properties[j];  in ab8500_btemp_get_ext_psy_data()
573 			switch (ext->desc->type) {  in ab8500_btemp_get_ext_psy_data()
576 				if (!ret.intval && di->events.ac_conn) {  in ab8500_btemp_get_ext_psy_data()
577 					di->events.ac_conn = false;  in ab8500_btemp_get_ext_psy_data()
580 				else if (ret.intval && !di->events.ac_conn) {  in ab8500_btemp_get_ext_psy_data()
581 					di->events.ac_conn = true;  in ab8500_btemp_get_ext_psy_data()
582 					if (!di->events.usb_conn)  in ab8500_btemp_get_ext_psy_data()
588 				if (!ret.intval && di->events.usb_conn) {  in ab8500_btemp_get_ext_psy_data()
589 					di->events.usb_conn = false;  in ab8500_btemp_get_ext_psy_data()
592 				else if (ret.intval && !di->events.usb_conn) {  in ab8500_btemp_get_ext_psy_data()
593 					di->events.usb_conn = true;  in ab8500_btemp_get_ext_psy_data()
594 					if (!di->events.ac_conn)  in ab8500_btemp_get_ext_psy_data()
610  * ab8500_btemp_external_power_changed() - callback for power supply changes
670 	di->btemp_wq =  in ab8500_btemp_bind()
672 	if (di->btemp_wq == NULL) {  in ab8500_btemp_bind()
674 		return -ENOMEM;  in ab8500_btemp_bind()
677 	/* Kick off periodic temperature measurements */  in ab8500_btemp_bind()
689 	destroy_workqueue(di->btemp_wq);  in ab8500_btemp_unbind()
700 	struct device *dev = &pdev->dev;  in ab8500_btemp_probe()
707 		return -ENOMEM;  in ab8500_btemp_probe()
709 	di->bm = &ab8500_bm_data;  in ab8500_btemp_probe()
712 	di->dev = dev;  in ab8500_btemp_probe()
713 	di->parent = dev_get_drvdata(pdev->dev.parent);  in ab8500_btemp_probe()
716 	di->tz = thermal_zone_get_zone_by_name("battery-thermal");  in ab8500_btemp_probe()
717 	if (IS_ERR(di->tz)) {  in ab8500_btemp_probe()
718 		ret = PTR_ERR(di->tz);  in ab8500_btemp_probe()
723 		if (ret == -ENODEV)  in ab8500_btemp_probe()
724 			ret = -EPROBE_DEFER;  in ab8500_btemp_probe()
726 				     "failed to get battery thermal zone\n");  in ab8500_btemp_probe()
728 	di->bat_ctrl = devm_iio_channel_get(dev, "bat_ctrl");  in ab8500_btemp_probe()
729 	if (IS_ERR(di->bat_ctrl)) {  in ab8500_btemp_probe()
730 		ret = dev_err_probe(dev, PTR_ERR(di->bat_ctrl),  in ab8500_btemp_probe()
735 	di->initialized = false;  in ab8500_btemp_probe()
741 	/* Init work for measuring temperature periodically */  in ab8500_btemp_probe()
742 	INIT_DEFERRABLE_WORK(&di->btemp_periodic_work,  in ab8500_btemp_probe()
746 	di->btemp_ranges.btemp_low_limit = BTEMP_THERMAL_LOW_LIMIT;  in ab8500_btemp_probe()
747 	di->btemp_ranges.btemp_med_limit = BTEMP_THERMAL_MED_LIMIT;  in ab8500_btemp_probe()
758 		di->btemp_ranges.btemp_high_limit =  in ab8500_btemp_probe()
762 		di->btemp_ranges.btemp_high_limit =  in ab8500_btemp_probe()
766 		di->btemp_ranges.btemp_high_limit =  in ab8500_btemp_probe()
772 	di->btemp_psy = devm_power_supply_register(dev, &ab8500_btemp_desc,  in ab8500_btemp_probe()
774 	if (IS_ERR(di->btemp_psy)) {  in ab8500_btemp_probe()
776 		return PTR_ERR(di->btemp_psy);  in ab8500_btemp_probe()
801 	list_add_tail(&di->node, &ab8500_btemp_list);  in ab8500_btemp_probe()
808 	component_del(&pdev->dev, &ab8500_btemp_component_ops);  in ab8500_btemp_remove()
814 	{ .compatible = "stericsson,ab8500-btemp", },
823 		.name = "ab8500-btemp",
830 MODULE_ALIAS("platform:ab8500-btemp");
831 MODULE_DESCRIPTION("AB8500 battery temperature driver");