Commit 342d765e authored by Mike Rapoport's avatar Mike Rapoport Committed by Samuel Ortiz
Browse files

power_supply: Add Dialog DA9030 battery charger driver 



Driver for battery charger integrated into Dialog Semiconductor DA9030 PMIC

Signed-off-by: default avatarMike Rapoport <mike@compulab.co.il>
Acked-by: default avatarAnton Vorontsov <cbouatmailru@gmail.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@openedhand.com>
parent 856f6fd1

drivers/power/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -75,4 +75,11 @@ config BATTERY_BQ27x00 
	help

	  Say Y here to enable support for batteries with BQ27200(I2C) chip.



config BATTERY_DA9030

	tristate "DA9030 battery driver"

	depends on PMIC_DA903X

	help

	  Say Y here to enable support for batteries charger integrated into

	  DA9030 PMIC.



endif # POWER_SUPPLY

drivers/power/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -24,3 +24,4 @@ obj-$(CONFIG_BATTERY_OLPC) += olpc_battery.o 
obj-$(CONFIG_BATTERY_TOSA)	+= tosa_battery.o

obj-$(CONFIG_BATTERY_WM97XX)	+= wm97xx_battery.o

obj-$(CONFIG_BATTERY_BQ27x00)	+= bq27x00_battery.o

obj-$(CONFIG_BATTERY_DA9030)	+= da9030_battery.o

drivers/power/da9030_battery.c

0 → 100644
+600 −0
Original line number Diff line number Diff line 
/*

 * 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_STATUS_CHDET	(1 << 3)



#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);

}



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 {

		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);

	int status;



	switch (event) {

	case DA9030_EVENT_CHDET:

		status = da903x_query_status(charger->master,

					     DA9030_STATUS_CHDET);

		da9030_set_charge(charger, status);

		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 monotor runs unless platfrom 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(&charger->work);

	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");