drivers/power/da9030_battery.c - kernel/msm-4.19 - Gitiles

 /*
  * Battery charger driver for Dialog Semiconductor DA9030
  *
  * Copyright (C) 2008 Compulab, Ltd.
  * 	Mike Rapoport <mike@compulab.co.il>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/device.h>
 #include <linux/workqueue.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/power_supply.h>
 #include <linux/mfd/da903x.h>

 #include <linux/debugfs.h>
 #include <linux/seq_file.h>

 #define DA9030_FAULT_LOG		0x0a
 #define DA9030_FAULT_LOG_OVER_TEMP	(1 << 7)
 #define DA9030_FAULT_LOG_VBAT_OVER	(1 << 4)

 #define DA9030_CHARGE_CONTROL		0x28
 #define DA9030_CHRG_CHARGER_ENABLE	(1 << 7)

 #define DA9030_ADC_MAN_CONTROL		0x30
 #define DA9030_ADC_TBATREF_ENABLE	(1 << 5)
 #define DA9030_ADC_LDO_INT_ENABLE	(1 << 4)

 #define DA9030_ADC_AUTO_CONTROL		0x31
 #define DA9030_ADC_TBAT_ENABLE		(1 << 5)
 #define DA9030_ADC_VBAT_IN_TXON		(1 << 4)
 #define DA9030_ADC_VCH_ENABLE		(1 << 3)
 #define DA9030_ADC_ICH_ENABLE		(1 << 2)
 #define DA9030_ADC_VBAT_ENABLE		(1 << 1)
 #define DA9030_ADC_AUTO_SLEEP_ENABLE	(1 << 0)

 #define DA9030_VBATMON		0x32
 #define DA9030_VBATMONTXON	0x33
 #define DA9030_TBATHIGHP	0x34
 #define DA9030_TBATHIGHN	0x35
 #define DA9030_TBATLOW		0x36

 #define DA9030_VBAT_RES		0x41
 #define DA9030_VBATMIN_RES	0x42
 #define DA9030_VBATMINTXON_RES	0x43
 #define DA9030_ICHMAX_RES	0x44
 #define DA9030_ICHMIN_RES	0x45
 #define DA9030_ICHAVERAGE_RES	0x46
 #define DA9030_VCHMAX_RES	0x47
 #define DA9030_VCHMIN_RES	0x48
 #define DA9030_TBAT_RES		0x49

 struct da9030_adc_res {
 	uint8_t vbat_res;
 	uint8_t vbatmin_res;
 	uint8_t vbatmintxon;
 	uint8_t ichmax_res;
 	uint8_t ichmin_res;
 	uint8_t ichaverage_res;
 	uint8_t vchmax_res;
 	uint8_t vchmin_res;
 	uint8_t tbat_res;
 	uint8_t adc_in4_res;
 	uint8_t adc_in5_res;
 };

 struct da9030_battery_thresholds {
 	int tbat_low;
 	int tbat_high;
 	int tbat_restart;

 	int vbat_low;
 	int vbat_crit;
 	int vbat_charge_start;
 	int vbat_charge_stop;
 	int vbat_charge_restart;

 	int vcharge_min;
 	int vcharge_max;
 };

 struct da9030_charger {
 	struct power_supply psy;

 	struct device *master;

 	struct da9030_adc_res adc;
 	struct delayed_work work;
 	unsigned int interval;

 	struct power_supply_info *battery_info;

 	struct da9030_battery_thresholds thresholds;

 	unsigned int charge_milliamp;
 	unsigned int charge_millivolt;

 	/* charger status */
 	bool chdet;
 	uint8_t fault;
 	int mA;
 	int mV;
 	bool is_on;

 	struct notifier_block nb;

 	/* platform callbacks for battery low and critical events */
 	void (*battery_low)(void);
 	void (*battery_critical)(void);

 	struct dentry *debug_file;
 };

 static inline int da9030_reg_to_mV(int reg)
 {
 	return ((reg * 2650) >> 8) + 2650;
 }

 static inline int da9030_millivolt_to_reg(int mV)
 {
 	return ((mV - 2650) << 8) / 2650;
 }

 static inline int da9030_reg_to_mA(int reg)
 {
 	return ((reg * 24000) >> 8) / 15;
 }

 #ifdef CONFIG_DEBUG_FS
 static int bat_debug_show(struct seq_file *s, void *data)
 {
 	struct da9030_charger *charger = s->private;

 	seq_printf(s, "charger is %s\n", charger->is_on ? "on" : "off");
 	if (charger->chdet) {
 		seq_printf(s, "iset = %dmA, vset = %dmV\n",
 			   charger->mA, charger->mV);
 	}

 	seq_printf(s, "vbat_res = %d (%dmV)\n",
 		   charger->adc.vbat_res,
 		   da9030_reg_to_mV(charger->adc.vbat_res));
 	seq_printf(s, "vbatmin_res = %d (%dmV)\n",
 		   charger->adc.vbatmin_res,
 		   da9030_reg_to_mV(charger->adc.vbatmin_res));
 	seq_printf(s, "vbatmintxon = %d (%dmV)\n",
 		   charger->adc.vbatmintxon,
 		   da9030_reg_to_mV(charger->adc.vbatmintxon));
 	seq_printf(s, "ichmax_res = %d (%dmA)\n",
 		   charger->adc.ichmax_res,
 		   da9030_reg_to_mV(charger->adc.ichmax_res));
 	seq_printf(s, "ichmin_res = %d (%dmA)\n",
 		   charger->adc.ichmin_res,
 		   da9030_reg_to_mA(charger->adc.ichmin_res));
 	seq_printf(s, "ichaverage_res = %d (%dmA)\n",
 		   charger->adc.ichaverage_res,
 		   da9030_reg_to_mA(charger->adc.ichaverage_res));
 	seq_printf(s, "vchmax_res = %d (%dmV)\n",
 		   charger->adc.vchmax_res,
 		   da9030_reg_to_mA(charger->adc.vchmax_res));
 	seq_printf(s, "vchmin_res = %d (%dmV)\n",
 		   charger->adc.vchmin_res,
 		   da9030_reg_to_mV(charger->adc.vchmin_res));

 	return 0;
 }

 static int debug_open(struct inode *inode, struct file *file)
 {
 	return single_open(file, bat_debug_show, inode->i_private);
 }

 static const struct file_operations bat_debug_fops = {
 	.open		= debug_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
 	.release	= single_release,
 };

 static struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
 {
 	charger->debug_file = debugfs_create_file("charger", 0666, 0, charger,
 						 &bat_debug_fops);
 	return charger->debug_file;
 }

 static void da9030_bat_remove_debugfs(struct da9030_charger *charger)
 {
 	debugfs_remove(charger->debug_file);
 }
 #else
 static inline struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
 {
 	return NULL;
 }
 static inline void da9030_bat_remove_debugfs(struct da9030_charger *charger)
 {
 }
 #endif

 static inline void da9030_read_adc(struct da9030_charger *charger,
 				   struct da9030_adc_res *adc)
 {
 	da903x_reads(charger->master, DA9030_VBAT_RES,
 		     sizeof(*adc), (uint8_t *)adc);
 }

 static void da9030_charger_update_state(struct da9030_charger *charger)
 {
 	uint8_t val;

 	da903x_read(charger->master, DA9030_CHARGE_CONTROL, &val);
 	charger->is_on = (val & DA9030_CHRG_CHARGER_ENABLE) ? 1 : 0;
 	charger->mA = ((val >> 3) & 0xf) * 100;
 	charger->mV = (val & 0x7) * 50 + 4000;

 	da9030_read_adc(charger, &charger->adc);
 	da903x_read(charger->master, DA9030_FAULT_LOG, &charger->fault);
 	charger->chdet = da903x_query_status(charger->master,
 						     DA9030_STATUS_CHDET);
 }

 static void da9030_set_charge(struct da9030_charger *charger, int on)
 {
 	uint8_t val;

 	if (on) {
 		val = DA9030_CHRG_CHARGER_ENABLE;
 		val |= (charger->charge_milliamp / 100) << 3;
 		val |= (charger->charge_millivolt - 4000) / 50;
 		charger->is_on = 1;
 	} else {
 		val = 0;
 		charger->is_on = 0;
 	}

 	da903x_write(charger->master, DA9030_CHARGE_CONTROL, val);

 	power_supply_changed(&charger->psy);
 }

 static void da9030_charger_check_state(struct da9030_charger *charger)
 {
 	da9030_charger_update_state(charger);

 	/* we wake or boot with external power on */
 	if (!charger->is_on) {
 		if ((charger->chdet) &&
 		    (charger->adc.vbat_res <
 		     charger->thresholds.vbat_charge_start)) {
 			da9030_set_charge(charger, 1);
 		}
 	} else {
 		/* Charger has been pulled out */
 		if (!charger->chdet) {
 			da9030_set_charge(charger, 0);
 			return;
 		}

 		if (charger->adc.vbat_res >=
 		    charger->thresholds.vbat_charge_stop) {
 			da9030_set_charge(charger, 0);
 			da903x_write(charger->master, DA9030_VBATMON,
 				       charger->thresholds.vbat_charge_restart);
 		} else if (charger->adc.vbat_res >
 			   charger->thresholds.vbat_low) {
 			/* we are charging and passed LOW_THRESH,
 			   so upate DA9030 VBAT threshold
 			 */
 			da903x_write(charger->master, DA9030_VBATMON,
 				     charger->thresholds.vbat_low);
 		}
 		if (charger->adc.vchmax_res > charger->thresholds.vcharge_max ||
 		    charger->adc.vchmin_res < charger->thresholds.vcharge_min ||
 		    /* Tempreture readings are negative */
 		    charger->adc.tbat_res < charger->thresholds.tbat_high ||
 		    charger->adc.tbat_res > charger->thresholds.tbat_low) {
 			/* disable charger */
 			da9030_set_charge(charger, 0);
 		}
 	}
 }

 static void da9030_charging_monitor(struct work_struct *work)
 {
 	struct da9030_charger *charger;

 	charger = container_of(work, struct da9030_charger, work.work);

 	da9030_charger_check_state(charger);

 	/* reschedule for the next time */
 	schedule_delayed_work(&charger->work, charger->interval);
 }

 static enum power_supply_property da9030_battery_props[] = {
 	POWER_SUPPLY_PROP_MODEL_NAME,
 	POWER_SUPPLY_PROP_STATUS,
 	POWER_SUPPLY_PROP_HEALTH,
 	POWER_SUPPLY_PROP_TECHNOLOGY,
 	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
 	POWER_SUPPLY_PROP_CURRENT_AVG,
 };

 static void da9030_battery_check_status(struct da9030_charger *charger,
 				    union power_supply_propval *val)
 {
 	if (charger->chdet) {
 		if (charger->is_on)
 			val->intval = POWER_SUPPLY_STATUS_CHARGING;
 		else
 			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 	} else {
 		val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 	}
 }

 static void da9030_battery_check_health(struct da9030_charger *charger,
 				    union power_supply_propval *val)
 {
 	if (charger->fault & DA9030_FAULT_LOG_OVER_TEMP)
 		val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
 	else if (charger->fault & DA9030_FAULT_LOG_VBAT_OVER)
 		val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 	else
 		val->intval = POWER_SUPPLY_HEALTH_GOOD;
 }

 static int da9030_battery_get_property(struct power_supply *psy,
 				   enum power_supply_property psp,
 				   union power_supply_propval *val)
 {
 	struct da9030_charger *charger;
 	charger = container_of(psy, struct da9030_charger, psy);

 	switch (psp) {
 	case POWER_SUPPLY_PROP_STATUS:
 		da9030_battery_check_status(charger, val);
 		break;
 	case POWER_SUPPLY_PROP_HEALTH:
 		da9030_battery_check_health(charger, val);
 		break;
 	case POWER_SUPPLY_PROP_TECHNOLOGY:
 		val->intval = charger->battery_info->technology;
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 		val->intval = charger->battery_info->voltage_max_design;
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 		val->intval = charger->battery_info->voltage_min_design;
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 		val->intval = da9030_reg_to_mV(charger->adc.vbat_res) * 1000;
 		break;
 	case POWER_SUPPLY_PROP_CURRENT_AVG:
 		val->intval =
 			da9030_reg_to_mA(charger->adc.ichaverage_res) * 1000;
 		break;
 	case POWER_SUPPLY_PROP_MODEL_NAME:
 		val->strval = charger->battery_info->name;
 		break;
 	default:
 		break;
 	}

 	return 0;
 }

 static void da9030_battery_vbat_event(struct da9030_charger *charger)
 {
 	da9030_read_adc(charger, &charger->adc);

 	if (charger->is_on)
 		return;

 	if (charger->adc.vbat_res < charger->thresholds.vbat_low) {
 		/* set VBAT threshold for critical */
 		da903x_write(charger->master, DA9030_VBATMON,
 			     charger->thresholds.vbat_crit);
 		if (charger->battery_low)
 			charger->battery_low();
 	} else if (charger->adc.vbat_res <
 		   charger->thresholds.vbat_crit) {
 		/* notify the system of battery critical */
 		if (charger->battery_critical)
 			charger->battery_critical();
 	}
 }

 static int da9030_battery_event(struct notifier_block *nb, unsigned long event,
 				void *data)
 {
 	struct da9030_charger *charger =
 		container_of(nb, struct da9030_charger, nb);

 	switch (event) {
 	case DA9030_EVENT_CHDET:
 		cancel_delayed_work_sync(&charger->work);
 		schedule_work(&charger->work.work);
 		break;
 	case DA9030_EVENT_VBATMON:
 		da9030_battery_vbat_event(charger);
 		break;
 	case DA9030_EVENT_CHIOVER:
 	case DA9030_EVENT_TBAT:
 		da9030_set_charge(charger, 0);
 		break;
 	}

 	return 0;
 }

 static void da9030_battery_convert_thresholds(struct da9030_charger *charger,
 					      struct da9030_battery_info *pdata)
 {
 	charger->thresholds.tbat_low = pdata->tbat_low;
 	charger->thresholds.tbat_high = pdata->tbat_high;
 	charger->thresholds.tbat_restart  = pdata->tbat_restart;

 	charger->thresholds.vbat_low =
 		da9030_millivolt_to_reg(pdata->vbat_low);
 	charger->thresholds.vbat_crit =
 		da9030_millivolt_to_reg(pdata->vbat_crit);
 	charger->thresholds.vbat_charge_start =
 		da9030_millivolt_to_reg(pdata->vbat_charge_start);
 	charger->thresholds.vbat_charge_stop =
 		da9030_millivolt_to_reg(pdata->vbat_charge_stop);
 	charger->thresholds.vbat_charge_restart =
 		da9030_millivolt_to_reg(pdata->vbat_charge_restart);

 	charger->thresholds.vcharge_min =
 		da9030_millivolt_to_reg(pdata->vcharge_min);
 	charger->thresholds.vcharge_max =
 		da9030_millivolt_to_reg(pdata->vcharge_max);
 }

 static void da9030_battery_setup_psy(struct da9030_charger *charger)
 {
 	struct power_supply *psy = &charger->psy;
 	struct power_supply_info *info = charger->battery_info;

 	psy->name = info->name;
 	psy->use_for_apm = info->use_for_apm;
 	psy->type = POWER_SUPPLY_TYPE_BATTERY;
 	psy->get_property = da9030_battery_get_property;

 	psy->properties = da9030_battery_props;
 	psy->num_properties = ARRAY_SIZE(da9030_battery_props);
 };

 static int da9030_battery_charger_init(struct da9030_charger *charger)
 {
 	char v[5];
 	int ret;

 	v[0] = v[1] = charger->thresholds.vbat_low;
 	v[2] = charger->thresholds.tbat_high;
 	v[3] = charger->thresholds.tbat_restart;
 	v[4] = charger->thresholds.tbat_low;

 	ret = da903x_writes(charger->master, DA9030_VBATMON, 5, v);
 	if (ret)
 		return ret;

 	/*
 	 * Enable reference voltage supply for ADC from the LDO_INTERNAL
 	 * regulator. Must be set before ADC measurements can be made.
 	 */
 	ret = da903x_write(charger->master, DA9030_ADC_MAN_CONTROL,
 			   DA9030_ADC_LDO_INT_ENABLE |
 			   DA9030_ADC_TBATREF_ENABLE);
 	if (ret)
 		return ret;

 	/* enable auto ADC measuremnts */
 	return da903x_write(charger->master, DA9030_ADC_AUTO_CONTROL,
 			    DA9030_ADC_TBAT_ENABLE | DA9030_ADC_VBAT_IN_TXON |
 			    DA9030_ADC_VCH_ENABLE | DA9030_ADC_ICH_ENABLE |
 			    DA9030_ADC_VBAT_ENABLE |
 			    DA9030_ADC_AUTO_SLEEP_ENABLE);
 }

 static int da9030_battery_probe(struct platform_device *pdev)
 {
 	struct da9030_charger *charger;
 	struct da9030_battery_info *pdata = pdev->dev.platform_data;
 	int ret;

 	if (pdata == NULL)
 		return -EINVAL;

 	if (pdata->charge_milliamp >= 1500 ||
 	    pdata->charge_millivolt < 4000 ||
 	    pdata->charge_millivolt > 4350)
 		return -EINVAL;

 	charger = kzalloc(sizeof(*charger), GFP_KERNEL);
 	if (charger == NULL)
 		return -ENOMEM;

 	charger->master = pdev->dev.parent;

 	/* 10 seconds between monitor runs unless platform defines other
 	   interval */
 	charger->interval = msecs_to_jiffies(
 		(pdata->batmon_interval ? : 10) * 1000);

 	charger->charge_milliamp = pdata->charge_milliamp;
 	charger->charge_millivolt = pdata->charge_millivolt;
 	charger->battery_info = pdata->battery_info;
 	charger->battery_low = pdata->battery_low;
 	charger->battery_critical = pdata->battery_critical;

 	da9030_battery_convert_thresholds(charger, pdata);

 	ret = da9030_battery_charger_init(charger);
 	if (ret)
 		goto err_charger_init;

 	INIT_DELAYED_WORK(&charger->work, da9030_charging_monitor);
 	schedule_delayed_work(&charger->work, charger->interval);

 	charger->nb.notifier_call = da9030_battery_event;
 	ret = da903x_register_notifier(charger->master, &charger->nb,
 				       DA9030_EVENT_CHDET |
 				       DA9030_EVENT_VBATMON |
 				       DA9030_EVENT_CHIOVER |
 				       DA9030_EVENT_TBAT);
 	if (ret)
 		goto err_notifier;

 	da9030_battery_setup_psy(charger);
 	ret = power_supply_register(&pdev->dev, &charger->psy);
 	if (ret)
 		goto err_ps_register;

 	charger->debug_file = da9030_bat_create_debugfs(charger);
 	platform_set_drvdata(pdev, charger);
 	return 0;

 err_ps_register:
 	da903x_unregister_notifier(charger->master, &charger->nb,
 				   DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
 				   DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
 err_notifier:
 	cancel_delayed_work(&charger->work);

 err_charger_init:
 	kfree(charger);

 	return ret;
 }

 static int da9030_battery_remove(struct platform_device *dev)
 {
 	struct da9030_charger *charger = platform_get_drvdata(dev);

 	da9030_bat_remove_debugfs(charger);

 	da903x_unregister_notifier(charger->master, &charger->nb,
 				   DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
 				   DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
 	cancel_delayed_work_sync(&charger->work);
 	da9030_set_charge(charger, 0);
 	power_supply_unregister(&charger->psy);

 	kfree(charger);

 	return 0;
 }

 static struct platform_driver da903x_battery_driver = {
 	.driver	= {
 		.name	= "da903x-battery",
 		.owner	= THIS_MODULE,
 	},
 	.probe = da9030_battery_probe,
 	.remove = da9030_battery_remove,
 };

 static int da903x_battery_init(void)
 {
 	return platform_driver_register(&da903x_battery_driver);
 }

 static void da903x_battery_exit(void)
 {
 	platform_driver_unregister(&da903x_battery_driver);
 }

 module_init(da903x_battery_init);
 module_exit(da903x_battery_exit);

 MODULE_DESCRIPTION("DA9030 battery charger driver");
 MODULE_AUTHOR("Mike Rapoport, CompuLab");
 MODULE_LICENSE("GPL");
	/*
	* Battery charger driver for Dialog Semiconductor DA9030
	*
	* Copyright (C) 2008 Compulab, Ltd.
	* Mike Rapoport <mike@compulab.co.il>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/types.h>
	#include <linux/device.h>
	#include <linux/workqueue.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/power_supply.h>
	#include <linux/mfd/da903x.h>

	#include <linux/debugfs.h>
	#include <linux/seq_file.h>

	#define DA9030_FAULT_LOG 0x0a
	#define DA9030_FAULT_LOG_OVER_TEMP (1 << 7)
	#define DA9030_FAULT_LOG_VBAT_OVER (1 << 4)

	#define DA9030_CHARGE_CONTROL 0x28
	#define DA9030_CHRG_CHARGER_ENABLE (1 << 7)

	#define DA9030_ADC_MAN_CONTROL 0x30
	#define DA9030_ADC_TBATREF_ENABLE (1 << 5)
	#define DA9030_ADC_LDO_INT_ENABLE (1 << 4)

	#define DA9030_ADC_AUTO_CONTROL 0x31
	#define DA9030_ADC_TBAT_ENABLE (1 << 5)
	#define DA9030_ADC_VBAT_IN_TXON (1 << 4)
	#define DA9030_ADC_VCH_ENABLE (1 << 3)
	#define DA9030_ADC_ICH_ENABLE (1 << 2)
	#define DA9030_ADC_VBAT_ENABLE (1 << 1)
	#define DA9030_ADC_AUTO_SLEEP_ENABLE (1 << 0)

	#define DA9030_VBATMON 0x32
	#define DA9030_VBATMONTXON 0x33
	#define DA9030_TBATHIGHP 0x34
	#define DA9030_TBATHIGHN 0x35
	#define DA9030_TBATLOW 0x36

	#define DA9030_VBAT_RES 0x41
	#define DA9030_VBATMIN_RES 0x42
	#define DA9030_VBATMINTXON_RES 0x43
	#define DA9030_ICHMAX_RES 0x44
	#define DA9030_ICHMIN_RES 0x45
	#define DA9030_ICHAVERAGE_RES 0x46
	#define DA9030_VCHMAX_RES 0x47
	#define DA9030_VCHMIN_RES 0x48
	#define DA9030_TBAT_RES 0x49

	struct da9030_adc_res {
	uint8_t vbat_res;
	uint8_t vbatmin_res;
	uint8_t vbatmintxon;
	uint8_t ichmax_res;
	uint8_t ichmin_res;
	uint8_t ichaverage_res;
	uint8_t vchmax_res;
	uint8_t vchmin_res;
	uint8_t tbat_res;
	uint8_t adc_in4_res;
	uint8_t adc_in5_res;
	};

	struct da9030_battery_thresholds {
	int tbat_low;
	int tbat_high;
	int tbat_restart;

	int vbat_low;
	int vbat_crit;
	int vbat_charge_start;
	int vbat_charge_stop;
	int vbat_charge_restart;

	int vcharge_min;
	int vcharge_max;
	};

	struct da9030_charger {
	struct power_supply psy;

	struct device *master;

	struct da9030_adc_res adc;
	struct delayed_work work;
	unsigned int interval;

	struct power_supply_info *battery_info;

	struct da9030_battery_thresholds thresholds;

	unsigned int charge_milliamp;
	unsigned int charge_millivolt;

	/* charger status */
	bool chdet;
	uint8_t fault;
	int mA;
	int mV;
	bool is_on;

	struct notifier_block nb;

	/* platform callbacks for battery low and critical events */
	void (*battery_low)(void);
	void (*battery_critical)(void);

	struct dentry *debug_file;
	};

	static inline int da9030_reg_to_mV(int reg)
	{
	return ((reg * 2650) >> 8) + 2650;
	}

	static inline int da9030_millivolt_to_reg(int mV)
	{
	return ((mV - 2650) << 8) / 2650;
	}

	static inline int da9030_reg_to_mA(int reg)
	{
	return ((reg * 24000) >> 8) / 15;
	}

	#ifdef CONFIG_DEBUG_FS
	static int bat_debug_show(struct seq_file s, void data)
	{
	struct da9030_charger *charger = s->private;

	seq_printf(s, "charger is %s\n", charger->is_on ? "on" : "off");
	if (charger->chdet) {
	seq_printf(s, "iset = %dmA, vset = %dmV\n",
	charger->mA, charger->mV);
	}

	seq_printf(s, "vbat_res = %d (%dmV)\n",
	charger->adc.vbat_res,
	da9030_reg_to_mV(charger->adc.vbat_res));
	seq_printf(s, "vbatmin_res = %d (%dmV)\n",
	charger->adc.vbatmin_res,
	da9030_reg_to_mV(charger->adc.vbatmin_res));
	seq_printf(s, "vbatmintxon = %d (%dmV)\n",
	charger->adc.vbatmintxon,
	da9030_reg_to_mV(charger->adc.vbatmintxon));
	seq_printf(s, "ichmax_res = %d (%dmA)\n",
	charger->adc.ichmax_res,
	da9030_reg_to_mV(charger->adc.ichmax_res));
	seq_printf(s, "ichmin_res = %d (%dmA)\n",
	charger->adc.ichmin_res,
	da9030_reg_to_mA(charger->adc.ichmin_res));
	seq_printf(s, "ichaverage_res = %d (%dmA)\n",
	charger->adc.ichaverage_res,
	da9030_reg_to_mA(charger->adc.ichaverage_res));
	seq_printf(s, "vchmax_res = %d (%dmV)\n",
	charger->adc.vchmax_res,
	da9030_reg_to_mA(charger->adc.vchmax_res));
	seq_printf(s, "vchmin_res = %d (%dmV)\n",
	charger->adc.vchmin_res,
	da9030_reg_to_mV(charger->adc.vchmin_res));

	return 0;
	}

	static int debug_open(struct inode inode, struct file file)
	{
	return single_open(file, bat_debug_show, inode->i_private);
	}

	static const struct file_operations bat_debug_fops = {
	.open = debug_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	};

	static struct dentry da9030_bat_create_debugfs(struct da9030_charger charger)
	{
	charger->debug_file = debugfs_create_file("charger", 0666, 0, charger,
	&bat_debug_fops);
	return charger->debug_file;
	}

	static void da9030_bat_remove_debugfs(struct da9030_charger *charger)
	{
	debugfs_remove(charger->debug_file);
	}
	#else
	static inline struct dentry da9030_bat_create_debugfs(struct da9030_charger charger)
	{
	return NULL;
	}
	static inline void da9030_bat_remove_debugfs(struct da9030_charger *charger)
	{
	}
	#endif

	static inline void da9030_read_adc(struct da9030_charger *charger,
	struct da9030_adc_res *adc)
	{
	da903x_reads(charger->master, DA9030_VBAT_RES,
	sizeof(adc), (uint8_t )adc);
	}

	static void da9030_charger_update_state(struct da9030_charger *charger)
	{
	uint8_t val;

	da903x_read(charger->master, DA9030_CHARGE_CONTROL, &val);
	charger->is_on = (val & DA9030_CHRG_CHARGER_ENABLE) ? 1 : 0;
	charger->mA = ((val >> 3) & 0xf) * 100;
	charger->mV = (val & 0x7) * 50 + 4000;

	da9030_read_adc(charger, &charger->adc);
	da903x_read(charger->master, DA9030_FAULT_LOG, &charger->fault);
	charger->chdet = da903x_query_status(charger->master,
	DA9030_STATUS_CHDET);
	}

	static void da9030_set_charge(struct da9030_charger *charger, int on)
	{
	uint8_t val;

	if (on) {
	val = DA9030_CHRG_CHARGER_ENABLE;
	val \|= (charger->charge_milliamp / 100) << 3;
	val \|= (charger->charge_millivolt - 4000) / 50;
	charger->is_on = 1;
	} else {
	val = 0;
	charger->is_on = 0;
	}

	da903x_write(charger->master, DA9030_CHARGE_CONTROL, val);

	power_supply_changed(&charger->psy);
	}

	static void da9030_charger_check_state(struct da9030_charger *charger)
	{
	da9030_charger_update_state(charger);

	/* we wake or boot with external power on */
	if (!charger->is_on) {
	if ((charger->chdet) &&
	(charger->adc.vbat_res <
	charger->thresholds.vbat_charge_start)) {
	da9030_set_charge(charger, 1);
	}
	} else {
	/* Charger has been pulled out */
	if (!charger->chdet) {
	da9030_set_charge(charger, 0);
	return;
	}

	if (charger->adc.vbat_res >=
	charger->thresholds.vbat_charge_stop) {
	da9030_set_charge(charger, 0);
	da903x_write(charger->master, DA9030_VBATMON,
	charger->thresholds.vbat_charge_restart);
	} else if (charger->adc.vbat_res >
	charger->thresholds.vbat_low) {
	/* we are charging and passed LOW_THRESH,
	so upate DA9030 VBAT threshold
	*/
	da903x_write(charger->master, DA9030_VBATMON,
	charger->thresholds.vbat_low);
	}
	if (charger->adc.vchmax_res > charger->thresholds.vcharge_max \|\|
	charger->adc.vchmin_res < charger->thresholds.vcharge_min \|\|
	/* Tempreture readings are negative */
	charger->adc.tbat_res < charger->thresholds.tbat_high \|\|
	charger->adc.tbat_res > charger->thresholds.tbat_low) {
	/* disable charger */
	da9030_set_charge(charger, 0);
	}
	}
	}

	static void da9030_charging_monitor(struct work_struct *work)
	{
	struct da9030_charger *charger;

	charger = container_of(work, struct da9030_charger, work.work);

	da9030_charger_check_state(charger);

	/* reschedule for the next time */
	schedule_delayed_work(&charger->work, charger->interval);
	}

	static enum power_supply_property da9030_battery_props[] = {
	POWER_SUPPLY_PROP_MODEL_NAME,
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_AVG,
	};

	static void da9030_battery_check_status(struct da9030_charger *charger,
	union power_supply_propval *val)
	{
	if (charger->chdet) {
	if (charger->is_on)
	val->intval = POWER_SUPPLY_STATUS_CHARGING;
	else
	val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
	} else {
	val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
	}
	}

	static void da9030_battery_check_health(struct da9030_charger *charger,
	union power_supply_propval *val)
	{
	if (charger->fault & DA9030_FAULT_LOG_OVER_TEMP)
	val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
	else if (charger->fault & DA9030_FAULT_LOG_VBAT_OVER)
	val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
	else
	val->intval = POWER_SUPPLY_HEALTH_GOOD;
	}

	static int da9030_battery_get_property(struct power_supply *psy,
	enum power_supply_property psp,
	union power_supply_propval *val)
	{
	struct da9030_charger *charger;
	charger = container_of(psy, struct da9030_charger, psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
	da9030_battery_check_status(charger, val);
	break;
	case POWER_SUPPLY_PROP_HEALTH:
	da9030_battery_check_health(charger, val);
	break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
	val->intval = charger->battery_info->technology;
	break;
	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
	val->intval = charger->battery_info->voltage_max_design;
	break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
	val->intval = charger->battery_info->voltage_min_design;
	break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	val->intval = da9030_reg_to_mV(charger->adc.vbat_res) * 1000;
	break;
	case POWER_SUPPLY_PROP_CURRENT_AVG:
	val->intval =
	da9030_reg_to_mA(charger->adc.ichaverage_res) * 1000;
	break;
	case POWER_SUPPLY_PROP_MODEL_NAME:
	val->strval = charger->battery_info->name;
	break;
	default:
	break;
	}

	return 0;
	}

	static void da9030_battery_vbat_event(struct da9030_charger *charger)
	{
	da9030_read_adc(charger, &charger->adc);

	if (charger->is_on)
	return;

	if (charger->adc.vbat_res < charger->thresholds.vbat_low) {
	/* set VBAT threshold for critical */
	da903x_write(charger->master, DA9030_VBATMON,
	charger->thresholds.vbat_crit);
	if (charger->battery_low)
	charger->battery_low();
	} else if (charger->adc.vbat_res <
	charger->thresholds.vbat_crit) {
	/* notify the system of battery critical */
	if (charger->battery_critical)
	charger->battery_critical();
	}
	}

	static int da9030_battery_event(struct notifier_block *nb, unsigned long event,
	void *data)
	{
	struct da9030_charger *charger =
	container_of(nb, struct da9030_charger, nb);

	switch (event) {
	case DA9030_EVENT_CHDET:
	cancel_delayed_work_sync(&charger->work);
	schedule_work(&charger->work.work);
	break;
	case DA9030_EVENT_VBATMON:
	da9030_battery_vbat_event(charger);
	break;
	case DA9030_EVENT_CHIOVER:
	case DA9030_EVENT_TBAT:
	da9030_set_charge(charger, 0);
	break;
	}

	return 0;
	}

	static void da9030_battery_convert_thresholds(struct da9030_charger *charger,
	struct da9030_battery_info *pdata)
	{
	charger->thresholds.tbat_low = pdata->tbat_low;
	charger->thresholds.tbat_high = pdata->tbat_high;
	charger->thresholds.tbat_restart = pdata->tbat_restart;

	charger->thresholds.vbat_low =
	da9030_millivolt_to_reg(pdata->vbat_low);
	charger->thresholds.vbat_crit =
	da9030_millivolt_to_reg(pdata->vbat_crit);
	charger->thresholds.vbat_charge_start =
	da9030_millivolt_to_reg(pdata->vbat_charge_start);
	charger->thresholds.vbat_charge_stop =
	da9030_millivolt_to_reg(pdata->vbat_charge_stop);
	charger->thresholds.vbat_charge_restart =
	da9030_millivolt_to_reg(pdata->vbat_charge_restart);

	charger->thresholds.vcharge_min =
	da9030_millivolt_to_reg(pdata->vcharge_min);
	charger->thresholds.vcharge_max =
	da9030_millivolt_to_reg(pdata->vcharge_max);
	}

	static void da9030_battery_setup_psy(struct da9030_charger *charger)
	{
	struct power_supply *psy = &charger->psy;
	struct power_supply_info *info = charger->battery_info;

	psy->name = info->name;
	psy->use_for_apm = info->use_for_apm;
	psy->type = POWER_SUPPLY_TYPE_BATTERY;
	psy->get_property = da9030_battery_get_property;

	psy->properties = da9030_battery_props;
	psy->num_properties = ARRAY_SIZE(da9030_battery_props);
	};

	static int da9030_battery_charger_init(struct da9030_charger *charger)
	{
	char v[5];
	int ret;

	v[0] = v[1] = charger->thresholds.vbat_low;
	v[2] = charger->thresholds.tbat_high;
	v[3] = charger->thresholds.tbat_restart;
	v[4] = charger->thresholds.tbat_low;

	ret = da903x_writes(charger->master, DA9030_VBATMON, 5, v);
	if (ret)
	return ret;

	/*
	* Enable reference voltage supply for ADC from the LDO_INTERNAL
	* regulator. Must be set before ADC measurements can be made.
	*/
	ret = da903x_write(charger->master, DA9030_ADC_MAN_CONTROL,
	DA9030_ADC_LDO_INT_ENABLE \|
	DA9030_ADC_TBATREF_ENABLE);
	if (ret)
	return ret;

	/* enable auto ADC measuremnts */
	return da903x_write(charger->master, DA9030_ADC_AUTO_CONTROL,
	DA9030_ADC_TBAT_ENABLE \| DA9030_ADC_VBAT_IN_TXON \|
	DA9030_ADC_VCH_ENABLE \| DA9030_ADC_ICH_ENABLE \|
	DA9030_ADC_VBAT_ENABLE \|
	DA9030_ADC_AUTO_SLEEP_ENABLE);
	}

	static int da9030_battery_probe(struct platform_device *pdev)
	{
	struct da9030_charger *charger;
	struct da9030_battery_info *pdata = pdev->dev.platform_data;
	int ret;

	if (pdata == NULL)
	return -EINVAL;

	if (pdata->charge_milliamp >= 1500 \|\|
	pdata->charge_millivolt < 4000 \|\|
	pdata->charge_millivolt > 4350)
	return -EINVAL;

	charger = kzalloc(sizeof(*charger), GFP_KERNEL);
	if (charger == NULL)
	return -ENOMEM;

	charger->master = pdev->dev.parent;

	/* 10 seconds between monitor runs unless platform defines other
	interval */
	charger->interval = msecs_to_jiffies(
	(pdata->batmon_interval ? : 10) * 1000);

	charger->charge_milliamp = pdata->charge_milliamp;
	charger->charge_millivolt = pdata->charge_millivolt;
	charger->battery_info = pdata->battery_info;
	charger->battery_low = pdata->battery_low;
	charger->battery_critical = pdata->battery_critical;

	da9030_battery_convert_thresholds(charger, pdata);

	ret = da9030_battery_charger_init(charger);
	if (ret)
	goto err_charger_init;

	INIT_DELAYED_WORK(&charger->work, da9030_charging_monitor);
	schedule_delayed_work(&charger->work, charger->interval);

	charger->nb.notifier_call = da9030_battery_event;
	ret = da903x_register_notifier(charger->master, &charger->nb,
	DA9030_EVENT_CHDET \|
	DA9030_EVENT_VBATMON \|
	DA9030_EVENT_CHIOVER \|
	DA9030_EVENT_TBAT);
	if (ret)
	goto err_notifier;

	da9030_battery_setup_psy(charger);
	ret = power_supply_register(&pdev->dev, &charger->psy);
	if (ret)
	goto err_ps_register;

	charger->debug_file = da9030_bat_create_debugfs(charger);
	platform_set_drvdata(pdev, charger);
	return 0;

	err_ps_register:
	da903x_unregister_notifier(charger->master, &charger->nb,
	DA9030_EVENT_CHDET \| DA9030_EVENT_VBATMON \|
	DA9030_EVENT_CHIOVER \| DA9030_EVENT_TBAT);
	err_notifier:
	cancel_delayed_work(&charger->work);

	err_charger_init:
	kfree(charger);

	return ret;
	}

	static int da9030_battery_remove(struct platform_device *dev)
	{
	struct da9030_charger *charger = platform_get_drvdata(dev);

	da9030_bat_remove_debugfs(charger);

	da903x_unregister_notifier(charger->master, &charger->nb,
	DA9030_EVENT_CHDET \| DA9030_EVENT_VBATMON \|
	DA9030_EVENT_CHIOVER \| DA9030_EVENT_TBAT);
	cancel_delayed_work_sync(&charger->work);
	da9030_set_charge(charger, 0);
	power_supply_unregister(&charger->psy);

	kfree(charger);

	return 0;
	}

	static struct platform_driver da903x_battery_driver = {
	.driver = {
	.name = "da903x-battery",
	.owner = THIS_MODULE,
	},
	.probe = da9030_battery_probe,
	.remove = da9030_battery_remove,
	};

	static int da903x_battery_init(void)
	{
	return platform_driver_register(&da903x_battery_driver);
	}

	static void da903x_battery_exit(void)
	{
	platform_driver_unregister(&da903x_battery_driver);
	}

	module_init(da903x_battery_init);
	module_exit(da903x_battery_exit);

	MODULE_DESCRIPTION("DA9030 battery charger driver");
	MODULE_AUTHOR("Mike Rapoport, CompuLab");
	MODULE_LICENSE("GPL");