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linux/drivers/power/da9030_battery.c

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/*
* 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/slab.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");
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