text: // SPDX-License-Identifier: GPL-2.0-only
  /*
   * Copyright (C) ST-Ericsson SA 2012
   *
   * Battery temperature driver for AB8500
   *
   * Author:
   *	Johan Palsson <johan.palsson@stericsson.com>
   *	Karl Komierowski <karl.komierowski@stericsson.com>
   *	Arun R Murthy <arun.murthy@stericsson.com>
   */
  
  #include <linux/init.h>
  #include <linux/module.h>
  #include <linux/device.h>
  #include <linux/component.h>
  #include <linux/interrupt.h>
  #include <linux/delay.h>
  #include <linux/slab.h>
  #include <linux/platform_device.h>
  #include <linux/power_supply.h>
  #include <linux/completion.h>
  #include <linux/workqueue.h>
  #include <linux/jiffies.h>
  #include <linux/of.h>
  #include <linux/mfd/core.h>
  #include <linux/mfd/abx500.h>
  #include <linux/mfd/abx500/ab8500.h>
  #include <linux/thermal.h>
  #include <linux/iio/consumer.h>
  #include <linux/fixp-arith.h>
  
  #include "ab8500-bm.h"
  
  #define BTEMP_THERMAL_LOW_LIMIT		-10
  #define BTEMP_THERMAL_MED_LIMIT		0
  #define BTEMP_THERMAL_HIGH_LIMIT_52	52
  #define BTEMP_THERMAL_HIGH_LIMIT_57	57
  #define BTEMP_THERMAL_HIGH_LIMIT_62	62
  
  #define BTEMP_BATCTRL_CURR_SRC_7UA	7
  #define BTEMP_BATCTRL_CURR_SRC_20UA	20
  
  #define BTEMP_BATCTRL_CURR_SRC_16UA	16
  #define BTEMP_BATCTRL_CURR_SRC_18UA	18
  
  #define BTEMP_BATCTRL_CURR_SRC_60UA	60
  #define BTEMP_BATCTRL_CURR_SRC_120UA	120
  
  /**
   * struct ab8500_btemp_interrupts - ab8500 interrupts
   * @name:	name of the interrupt
   * @isr		function pointer to the isr
   */
  struct ab8500_btemp_interrupts {
  	char *name;
  	irqreturn_t (*isr)(int irq, void *data);
  };
  
  struct ab8500_btemp_events {
  	bool batt_rem;
  	bool btemp_high;
  	bool btemp_medhigh;
  	bool btemp_lowmed;
  	bool btemp_low;
  	bool ac_conn;
  	bool usb_conn;
  };
  
  struct ab8500_btemp_ranges {
  	int btemp_high_limit;
  	int btemp_med_limit;
  	int btemp_low_limit;
  };
  
  /**
   * struct ab8500_btemp - ab8500 BTEMP device information
   * @dev:		Pointer to the structure device
   * @node:		List of AB8500 BTEMPs, hence prepared for reentrance
   * @curr_source:	What current source we use, in uA
   * @bat_temp:		Dispatched battery temperature in degree Celsius
   * @prev_bat_temp	Last measured battery temperature in degree Celsius
   * @parent:		Pointer to the struct ab8500
   * @tz:			Thermal zone for the battery
   * @adc_bat_ctrl:	ADC channel for the battery control
   * @fg:			Pointer to the struct fg
   * @bm:           	Platform specific battery management information
   * @btemp_psy:		Structure for BTEMP specific battery properties
   * @events:		Structure for information about events triggered
   * @btemp_ranges:	Battery temperature range structure
   * @btemp_wq:		Work queue for measuring the temperature periodically
   * @btemp_periodic_work:	Work for measuring the temperature periodically
   * @initialized:	True if battery id read.
   */
  struct ab8500_btemp {
  	struct device *dev;
  	struct list_head node;
  	int curr_source;
  	int bat_temp;
  	int prev_bat_temp;
  	struct ab8500 *parent;
  	struct thermal_zone_device *tz;
  	struct iio_channel *bat_ctrl;
  	struct ab8500_fg *fg;
  	struct ab8500_bm_data *bm;
  	struct power_supply *btemp_psy;
  	struct ab8500_btemp_events events;
  	struct ab8500_btemp_ranges btemp_ranges;
  	struct workqueue_struct *btemp_wq;
  	struct delayed_work btemp_periodic_work;
  	bool initialized;
  };
  
  /* BTEMP power supply properties */
  static enum power_supply_property ab8500_btemp_props[] = {
  	POWER_SUPPLY_PROP_PRESENT,
  	POWER_SUPPLY_PROP_ONLINE,
  	POWER_SUPPLY_PROP_TECHNOLOGY,
  	POWER_SUPPLY_PROP_TEMP,
  };
  
  static LIST_HEAD(ab8500_btemp_list);
  
  /**
   * ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance
   * @di:		pointer to the ab8500_btemp structure
   * @v_batctrl:	measured batctrl voltage
   * @inst_curr:	measured instant current
   *
   * This function returns the battery resistance that is
   * derived from the BATCTRL voltage.
   * Returns value in Ohms.
   */
  static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di,
  	int v_batctrl, int inst_curr)
  {
  	if (is_ab8500_1p1_or_earlier(di->parent)) {
  		/*
  		 * For ABB cut1.0 and 1.1 BAT_CTRL is internally
  		 * connected to 1.8V through a 450k resistor
  		 */
  		return (450000 * (v_batctrl)) / (1800 - v_batctrl);
  	}
  
  	/*
  	 * BAT_CTRL is internally
  	 * connected to 1.8V through a 80k resistor
  	 */
  	return (80000 * (v_batctrl)) / (1800 - v_batctrl);
  }
  
  /**
   * ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage
   * @di:		pointer to the ab8500_btemp structure
   *
   * This function returns the voltage on BATCTRL. Returns value in mV.
   */
  static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp *di)
  {
  	int vbtemp, ret;
  	static int prev;
  
  	ret = iio_read_channel_processed(di->bat_ctrl, &vbtemp);
  	if (ret < 0) {
  		dev_err(di->dev,
  			"%s ADC conversion failed, using previous value",
  			__func__);
  		return prev;
  	}
  	prev = vbtemp;
  	return vbtemp;
  }
  
  /**
   * ab8500_btemp_get_batctrl_res() - get battery resistance
   * @di:		pointer to the ab8500_btemp structure
   *
   * This function returns the battery pack identification resistance.
   * Returns value in Ohms.
   */
  static int ab8500_btemp_get_batctrl_res(struct ab8500_btemp *di)
  {
  	int ret;
  	int batctrl = 0;
  	int res;
  	int inst_curr;
  	int i;
  
  	if (!di->fg)
  		di->fg = ab8500_fg_get();
  	if (!di->fg) {
  		dev_err(di->dev, "No fg found\n");
  		return -EINVAL;
  	}
  
  	ret = ab8500_fg_inst_curr_start(di->fg);
  
  	if (ret) {
  		dev_err(di->dev, "Failed to start current measurement\n");
  		return ret;
  	}
  
  	do {
  		msleep(20);
  	} while (!ab8500_fg_inst_curr_started(di->fg));
  
  	i = 0;
  
  	do {
  		batctrl += ab8500_btemp_read_batctrl_voltage(di);
  		i++;
  		msleep(20);
  	} while (!ab8500_fg_inst_curr_done(di->fg));
  	batctrl /= i;
  
  	ret = ab8500_fg_inst_curr_finalize(di->fg, &inst_curr);
  	if (ret) {
  		dev_err(di->dev, "Failed to finalize current measurement\n");
  		return ret;
  	}
  
  	res = ab8500_btemp_batctrl_volt_to_res(di, batctrl, inst_curr);
  
  	dev_dbg(di->dev, "%s batctrl: %d res: %d inst_curr: %d samples: %d\n",
  		__func__, batctrl, res, inst_curr, i);
  
  	return res;
  }
  
  /**
   * ab8500_btemp_id() - Identify the connected battery
   * @di:		pointer to the ab8500_btemp structure
   *
   * This function will try to identify the battery by reading the ID
   * resistor. Some brands use a combined ID resistor with a NTC resistor to
   * both be able to identify and to read the temperature of it.
   */
  static int ab8500_btemp_id(struct ab8500_btemp *di)
  {
  	struct power_supply_battery_info *bi = di->bm->bi;
  	int res;
  
  	di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA;
  
  	res =  ab8500_btemp_get_batctrl_res(di);
  	if (res < 0) {
  		dev_err(di->dev, "%s get batctrl res failed\n", __func__);
  		return -ENXIO;
  	}
  
  	if (power_supply_battery_bti_in_range(bi, res)) {
  		dev_info(di->dev, "Battery detected on BATCTRL (pin C3)"
  			 " resistance %d Ohm = %d Ohm +/- %d%%\n",
  			 res, bi->bti_resistance_ohm,
  			 bi->bti_resistance_tolerance);
  	} else {
  		dev_warn(di->dev, "Battery identified as unknown"
  			 ", resistance %d Ohm\n", res);
  		return -ENXIO;
  	}
  
  	return 0;
  }
  
  /**
   * ab8500_btemp_periodic_work() - Measuring the temperature periodically
   * @work:	pointer to the work_struct structure
   *
   * Work function for measuring the temperature periodically
   */
  static void ab8500_btemp_periodic_work(struct work_struct *work)
  {
  	int interval;
  	int bat_temp;
  	struct ab8500_btemp *di = container_of(work,
  		struct ab8500_btemp, btemp_periodic_work.work);
  	/* Assume 25 degrees celsius as start temperature */
  	static int prev = 25;
  	int ret;
  
  	if (!di->initialized) {
  		/* Identify the battery */
  		if (ab8500_btemp_id(di) < 0)
  			dev_warn(di->dev, "failed to identify the battery\n");
  	}
  
  	/* Failover if a reading is erroneous, use last meausurement */
  	ret = thermal_zone_get_temp(di->tz, &bat_temp);
  	if (ret) {
  		dev_err(di->dev, "error reading temperature\n");
  		bat_temp = prev;
  	} else {
  		/* Convert from millicentigrades to centigrades */
  		bat_temp /= 1000;
  		prev = bat_temp;
  	}
  
  	/*
  	 * Filter battery temperature.
  	 * Allow direct updates on temperature only if two samples result in
  	 * same temperature. Else only allow 1 degree change from previous
  	 * reported value in the direction of the new measurement.
  	 */
  	if ((bat_temp == di->prev_bat_temp) || !di->initialized) {
  		if ((di->bat_temp != di->prev_bat_temp) || !di->initialized) {
  			di->initialized = true;
  			di->bat_temp = bat_temp;
  			power_supply_changed(di->btemp_psy);
  		}
  	} else if (bat_temp < di->prev_bat_temp) {
  		di->bat_temp--;
  		power_supply_changed(di->btemp_psy);
  	} else if (bat_temp > di->prev_bat_temp) {
  		di->bat_temp++;
  		power_supply_changed(di->btemp_psy);
  	}
  	di->prev_bat_temp = bat_temp;
  
  	if (di->events.ac_conn || di->events.usb_conn)
  		interval = di->bm->temp_interval_chg;
  	else
  		interval = di->bm->temp_interval_nochg;
  
  	/* Schedule a new measurement */
  	queue_delayed_work(di->btemp_wq,
  		&di->btemp_periodic_work,
  		round_jiffies(interval * HZ));
  }
  
  /**
   * ab8500_btemp_batctrlindb_handler() - battery removal detected
   * @irq:       interrupt number
   * @_di:       void pointer that has to address of ab8500_btemp
   *
   * Returns IRQ status(IRQ_HANDLED)
   */
  static irqreturn_t ab8500_btemp_batctrlindb_handler(int irq, void *_di)
  {
  	struct ab8500_btemp *di = _di;
  	dev_err(di->dev, "Battery removal detected!\n");
  
  	di->events.batt_rem = true;
  	power_supply_changed(di->btemp_psy);
  
  	return IRQ_HANDLED;
  }
  
  /**
   * ab8500_btemp_templow_handler() - battery temp lower than 10 degrees
   * @irq:       interrupt number
   * @_di:       void pointer that has to address of ab8500_btemp
   *
   * Returns IRQ status(IRQ_HANDLED)
   */
  static irqreturn_t ab8500_btemp_templow_handler(int irq, void *_di)
  {
  	struct ab8500_btemp *di = _di;
  
  	if (is_ab8500_3p3_or_earlier(di->parent)) {
  		dev_dbg(di->dev, "Ignore false btemp low irq"
  			" for ABB cut 1.0, 1.1, 2.0 and 3.3\n");
  	} else {
  		dev_crit(di->dev, "Battery temperature lower than -10deg c\n");
  
  		di->events.btemp_low = true;
  		di->events.btemp_high = false;
  		di->events.btemp_medhigh = false;
  		di->events.btemp_lowmed = false;
  		power_supply_changed(di->btemp_psy);
  	}
  
  	return IRQ_HANDLED;
  }
  
  /**
   * ab8500_btemp_temphigh_handler() - battery temp higher than max temp
   * @irq:       interrupt number
   * @_di:       void pointer that has to address of ab8500_btemp
   *
   * Returns IRQ status(IRQ_HANDLED)
   */
  static irqreturn_t ab8500_btemp_temphigh_handler(int irq, void *_di)
  {
  	struct ab8500_btemp *di = _di;
  
  	dev_crit(di->dev, "Battery temperature is higher than MAX temp\n");
  
  	di->events.btemp_high = true;
  	di->events.btemp_medhigh = false;
  	di->events.btemp_lowmed = false;
  	di->events.btemp_low = false;
  	power_supply_changed(di->btemp_psy);
  
  	return IRQ_HANDLED;
  }
  
  /**
   * ab8500_btemp_lowmed_handler() - battery temp between low and medium
   * @irq:       interrupt number
   * @_di:       void pointer that has to address of ab8500_btemp
   *
   * Returns IRQ status(IRQ_HANDLED)
   */
  static irqreturn_t ab8500_btemp_lowmed_handler(int irq, void *_di)
  {
  	struct ab8500_btemp *di = _di;
  
  	dev_dbg(di->dev, "Battery temperature is between low and medium\n");
  
  	di->events.btemp_lowmed = true;
  	di->events.btemp_medhigh = false;
  	di->events.btemp_high = false;
  	di->events.btemp_low = false;
  	power_supply_changed(di->btemp_psy);
  
  	return IRQ_HANDLED;
  }
  
  /**
   * ab8500_btemp_medhigh_handler() - battery temp between medium and high
   * @irq:       interrupt number
   * @_di:       void pointer that has to address of ab8500_btemp
   *
   * Returns IRQ status(IRQ_HANDLED)
   */
  static irqreturn_t ab8500_btemp_medhigh_handler(int irq, void *_di)
  {
  	struct ab8500_btemp *di = _di;
  
  	dev_dbg(di->dev, "Battery temperature is between medium and high\n");
  
  	di->events.btemp_medhigh = true;
  	di->events.btemp_lowmed = false;
  	di->events.btemp_high = false;
  	di->events.btemp_low = false;
  	power_supply_changed(di->btemp_psy);
  
  	return IRQ_HANDLED;
  }
  
  /**
   * ab8500_btemp_periodic() - Periodic temperature measurements
   * @di:		pointer to the ab8500_btemp structure
   * @enable:	enable or disable periodic temperature measurements
   *
   * Starts of stops periodic temperature measurements. Periodic measurements
   * should only be done when a charger is connected.
   */
  static void ab8500_btemp_periodic(struct ab8500_btemp *di,
  	bool enable)
  {
  	dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n",
  		enable);
  	/*
  	 * Make sure a new measurement is done directly by cancelling
  	 * any pending work
  	 */
  	cancel_delayed_work_sync(&di->btemp_periodic_work);
  
  	if (enable)
  		queue_delayed_work(di->btemp_wq, &di->btemp_periodic_work, 0);
  }
  
  /**
   * ab8500_btemp_get_temp() - get battery temperature
   * @di:		pointer to the ab8500_btemp structure
   *
   * Returns battery temperature
   */
  static int ab8500_btemp_get_temp(struct ab8500_btemp *di)
  {
  	int temp = 0;
  
  	/*
  	 * The BTEMP events are not reliabe on AB8500 cut3.3
  	 * and prior versions
  	 */
  	if (is_ab8500_3p3_or_earlier(di->parent)) {
  		temp = di->bat_temp * 10;
  	} else {
  		if (di->events.btemp_low) {
  			if (temp > di->btemp_ranges.btemp_low_limit)
  				temp = di->btemp_ranges.btemp_low_limit * 10;
  			else
  				temp = di->bat_temp * 10;
  		} else if (di->events.btemp_high) {
  			if (temp < di->btemp_ranges.btemp_high_limit)
  				temp = di->btemp_ranges.btemp_high_limit * 10;
  			else
  				temp = di->bat_temp * 10;
  		} else if (di->events.btemp_lowmed) {
  			if (temp > di->btemp_ranges.btemp_med_limit)
  				temp = di->btemp_ranges.btemp_med_limit * 10;
  			else
  				temp = di->bat_temp * 10;
  		} else if (di->events.btemp_medhigh) {
  			if (temp < di->btemp_ranges.btemp_med_limit)
  				temp = di->btemp_ranges.btemp_med_limit * 10;
  			else
  				temp = di->bat_temp * 10;
  		} else
  			temp = di->bat_temp * 10;
  	}
  	return temp;
  }
  
  /**
   * ab8500_btemp_get_property() - get the btemp properties
   * @psy:        pointer to the power_supply structure
   * @psp:        pointer to the power_supply_property structure
   * @val:        pointer to the power_supply_propval union
   *
   * This function gets called when an application tries to get the btemp
   * properties by reading the sysfs files.
   * online:	presence of the battery
   * present:	presence of the battery
   * technology:	battery technology
   * temp:	battery temperature
   * Returns error code in case of failure else 0(on success)
   */
  static int ab8500_btemp_get_property(struct power_supply *psy,
  	enum power_supply_property psp,
  	union power_supply_propval *val)
  {
  	struct ab8500_btemp *di = power_supply_get_drvdata(psy);
  
  	switch (psp) {
  	case POWER_SUPPLY_PROP_PRESENT:
  	case POWER_SUPPLY_PROP_ONLINE:
  		if (di->events.batt_rem)
  			val->intval = 0;
  		else
  			val->intval = 1;
  		break;
  	case POWER_SUPPLY_PROP_TECHNOLOGY:
  		if (di->bm->bi)
  			val->intval = di->bm->bi->technology;
  		else
  			val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
  		break;
  	case POWER_SUPPLY_PROP_TEMP:
  		val->intval = ab8500_btemp_get_temp(di);
  		break;
  	default:
  		return -EINVAL;
  	}
  	return 0;
  }
  
  static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data)
  {
  	struct power_supply *psy;
  	struct power_supply *ext = dev_get_drvdata(dev);
  	const char **supplicants = (const char **)ext->supplied_to;
  	struct ab8500_btemp *di;
  	union power_supply_propval ret;
  	int j;
  
  	psy = (struct power_supply *)data;
  	di = power_supply_get_drvdata(psy);
  
  	/*
  	 * For all psy where the name of your driver
  	 * appears in any supplied_to
  	 */
  	j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
  	if (j < 0)
  		return 0;
  
  	/* Go through all properties for the psy */
  	for (j = 0; j < ext->desc->num_properties; j++) {
  		enum power_supply_property prop;
  		prop = ext->desc->properties[j];
  
  		if (power_supply_get_property(ext, prop, &ret))
  			continue;
  
  		switch (prop) {
  		case POWER_SUPPLY_PROP_PRESENT:
  			switch (ext->desc->type) {
  			case POWER_SUPPLY_TYPE_MAINS:
  				/* AC disconnected */
  				if (!ret.intval && di->events.ac_conn) {
  					di->events.ac_conn = false;
  				}
  				/* AC connected */
  				else if (ret.intval && !di->events.ac_conn) {
  					di->events.ac_conn = true;
  					if (!di->events.usb_conn)
  						ab8500_btemp_periodic(di, true);
  				}
  				break;
  			case POWER_SUPPLY_TYPE_USB:
  				/* USB disconnected */
  				if (!ret.intval && di->events.usb_conn) {
  					di->events.usb_conn = false;
  				}
  				/* USB connected */
  				else if (ret.intval && !di->events.usb_conn) {
  					di->events.usb_conn = true;
  					if (!di->events.ac_conn)
  						ab8500_btemp_periodic(di, true);
  				}
  				break;
  			default:
  				break;
  			}
  			break;
  		default:
  			break;
  		}
  	}
  	return 0;
  }
  
  /**
   * ab8500_btemp_external_power_changed() - callback for power supply changes
   * @psy:       pointer to the structure power_supply
   *
   * This function is pointing to the function pointer external_power_changed
   * of the structure power_supply.
   * This function gets executed when there is a change in the external power
   * supply to the btemp.
   */
  static void ab8500_btemp_external_power_changed(struct power_supply *psy)
  {
  	struct ab8500_btemp *di = power_supply_get_drvdata(psy);
  
  	class_for_each_device(power_supply_class, NULL,
  		di->btemp_psy, ab8500_btemp_get_ext_psy_data);
  }
  
  /* ab8500 btemp driver interrupts and their respective isr */
  static struct ab8500_btemp_interrupts ab8500_btemp_irq[] = {
  	{"BAT_CTRL_INDB", ab8500_btemp_batctrlindb_handler},
  	{"BTEMP_LOW", ab8500_btemp_templow_handler},
  	{"BTEMP_HIGH", ab8500_btemp_temphigh_handler},
  	{"BTEMP_LOW_MEDIUM", ab8500_btemp_lowmed_handler},
  	{"BTEMP_MEDIUM_HIGH", ab8500_btemp_medhigh_handler},
  };
  
  static int __maybe_unused ab8500_btemp_resume(struct device *dev)
  {
  	struct ab8500_btemp *di = dev_get_drvdata(dev);
  
  	ab8500_btemp_periodic(di, true);
  
  	return 0;
  }
  
  static int __maybe_unused ab8500_btemp_suspend(struct device *dev)
  {
  	struct ab8500_btemp *di = dev_get_drvdata(dev);
  
  	ab8500_btemp_periodic(di, false);
  
  	return 0;
  }
  
  static char *supply_interface[] = {
  	"ab8500_chargalg",
  	"ab8500_fg",
  };
  
  static const struct power_supply_desc ab8500_btemp_desc = {
  	.name			= "ab8500_btemp",
  	.type			= POWER_SUPPLY_TYPE_BATTERY,
  	.properties		= ab8500_btemp_props,
  	.num_properties		= ARRAY_SIZE(ab8500_btemp_props),
  	.get_property		= ab8500_btemp_get_property,
  	.external_power_changed	= ab8500_btemp_external_power_changed,
  };
  
  static int ab8500_btemp_bind(struct device *dev, struct device *master,
  			     void *data)
  {
  	struct ab8500_btemp *di = dev_get_drvdata(dev);
  
  	/* Create a work queue for the btemp */
  	di->btemp_wq =
  		alloc_workqueue("ab8500_btemp_wq", WQ_MEM_RECLAIM, 0);
  	if (di->btemp_wq == NULL) {
  		dev_err(dev, "failed to create work queue\n");
  		return -ENOMEM;
  	}
  
  	/* Kick off periodic temperature measurements */
  	ab8500_btemp_periodic(di, true);
  
  	return 0;
  }
  
  static void ab8500_btemp_unbind(struct device *dev, struct device *master,
  				void *data)
  {
  	struct ab8500_btemp *di = dev_get_drvdata(dev);
  
  	/* Delete the work queue */
  	destroy_workqueue(di->btemp_wq);
  	flush_scheduled_work();
  }
  
  static const struct component_ops ab8500_btemp_component_ops = {
  	.bind = ab8500_btemp_bind,
  	.unbind = ab8500_btemp_unbind,
  };
  
  static int ab8500_btemp_probe(struct platform_device *pdev)
  {
  	struct power_supply_config psy_cfg = {};
  	struct device *dev = &pdev->dev;
  	struct ab8500_btemp *di;
  	int irq, i, ret = 0;
  	u8 val;
  
  	di = devm_kzalloc(dev, sizeof(*di), GFP_KERNEL);
  	if (!di)
  		return -ENOMEM;
  
  	di->bm = &ab8500_bm_data;
  
  	/* get parent data */
  	di->dev = dev;
  	di->parent = dev_get_drvdata(pdev->dev.parent);
  
  	/* Get thermal zone and ADC */
  	di->tz = thermal_zone_get_zone_by_name("battery-thermal");
  	if (IS_ERR(di->tz)) {
  		return dev_err_probe(dev, PTR_ERR(di->tz),
  				     "failed to get battery thermal zone\n");
  	}
  	di->bat_ctrl = devm_iio_channel_get(dev, "bat_ctrl");
  	if (IS_ERR(di->bat_ctrl)) {
  		ret = dev_err_probe(dev, PTR_ERR(di->bat_ctrl),
  				    "failed to get BAT CTRL ADC channel\n");
  		return ret;
  	}
  
  	di->initialized = false;
  
  	psy_cfg.supplied_to = supply_interface;
  	psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
  	psy_cfg.drv_data = di;
  
  	/* Init work for measuring temperature periodically */
  	INIT_DEFERRABLE_WORK(&di->btemp_periodic_work,
  		ab8500_btemp_periodic_work);
  
  	/* Set BTEMP thermal limits. Low and Med are fixed */
  	di->btemp_ranges.btemp_low_limit = BTEMP_THERMAL_LOW_LIMIT;
  	di->btemp_ranges.btemp_med_limit = BTEMP_THERMAL_MED_LIMIT;
  
  	ret = abx500_get_register_interruptible(dev, AB8500_CHARGER,
  		AB8500_BTEMP_HIGH_TH, &val);
  	if (ret < 0) {
  		dev_err(dev, "%s ab8500 read failed\n", __func__);
  		return ret;
  	}
  	switch (val) {
  	case BTEMP_HIGH_TH_57_0:
  	case BTEMP_HIGH_TH_57_1:
  		di->btemp_ranges.btemp_high_limit =
  			BTEMP_THERMAL_HIGH_LIMIT_57;
  		break;
  	case BTEMP_HIGH_TH_52:
  		di->btemp_ranges.btemp_high_limit =
  			BTEMP_THERMAL_HIGH_LIMIT_52;
  		break;
  	case BTEMP_HIGH_TH_62:
  		di->btemp_ranges.btemp_high_limit =
  			BTEMP_THERMAL_HIGH_LIMIT_62;
  		break;
  	}
  
  	/* Register BTEMP power supply class */
  	di->btemp_psy = devm_power_supply_register(dev, &ab8500_btemp_desc,
  						   &psy_cfg);
  	if (IS_ERR(di->btemp_psy)) {
  		dev_err(dev, "failed to register BTEMP psy\n");
  		return PTR_ERR(di->btemp_psy);
  	}
  
  	/* Register interrupts */
  	for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
  		irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
  		if (irq < 0)
  			return irq;
  
  		ret = devm_request_threaded_irq(dev, irq, NULL,
  			ab8500_btemp_irq[i].isr,
  			IRQF_SHARED | IRQF_NO_SUSPEND | IRQF_ONESHOT,
  			ab8500_btemp_irq[i].name, di);
  
  		if (ret) {
  			dev_err(dev, "failed to request %s IRQ %d: %d\n"
  				, ab8500_btemp_irq[i].name, irq, ret);
  			return ret;
  		}
  		dev_dbg(dev, "Requested %s IRQ %d: %d\n",
  			ab8500_btemp_irq[i].name, irq, ret);
  	}
  
  	platform_set_drvdata(pdev, di);
  
  	list_add_tail(&di->node, &ab8500_btemp_list);
  
  	return component_add(dev, &ab8500_btemp_component_ops);
  }
  
  static int ab8500_btemp_remove(struct platform_device *pdev)
  {
  	component_del(&pdev->dev, &ab8500_btemp_component_ops);
  
  	return 0;
  }
  
  static SIMPLE_DEV_PM_OPS(ab8500_btemp_pm_ops, ab8500_btemp_suspend, ab8500_btemp_resume);
  
  static const struct of_device_id ab8500_btemp_match[] = {
  	{ .compatible = "stericsson,ab8500-btemp", },
  	{ },
  };
  MODULE_DEVICE_TABLE(of, ab8500_btemp_match);
  
  struct platform_driver ab8500_btemp_driver = {
  	.probe = ab8500_btemp_probe,
  	.remove = ab8500_btemp_remove,
  	.driver = {
  		.name = "ab8500-btemp",
  		.of_match_table = ab8500_btemp_match,
  		.pm = &ab8500_btemp_pm_ops,
  	},
  };
  MODULE_LICENSE("GPL v2");
  MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
  MODULE_ALIAS("platform:ab8500-btemp");
  MODULE_DESCRIPTION("AB8500 battery temperature driver");
  