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wifipineapple-openwrt/target/linux/s3c24xx/files-2.6.30/drivers/power/bq27000_battery.c

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/*
* Driver for batteries with bq27000 chips inside via HDQ
*
* Copyright 2008 Openmoko, Inc
* Andy Green <andy@openmoko.com>
*
* based on ds2760 driver, original copyright notice for that --->
*
* Copyright © 2007 Anton Vorontsov
* 2004-2007 Matt Reimer
* 2004 Szabolcs Gyurko
*
* Use consistent with the GNU GPL is permitted,
* provided that this copyright notice is
* preserved in its entirety in all copies and derived works.
*
* Author: Anton Vorontsov <cbou@mail.ru>
* February 2007
*
* Matt Reimer <mreimer@vpop.net>
* April 2004, 2005, 2007
*
* Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>
* September 2004
*/
#include <linux/module.h>
#include <linux/param.h>
#include <linux/jiffies.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/bq27000_battery.h>
enum bq27000_regs {
/* RAM regs */
/* read-write after this */
BQ27000_CTRL = 0, /* Device Control Register */
BQ27000_MODE, /* Device Mode Register */
BQ27000_AR_L, /* At-Rate H L */
BQ27000_AR_H,
/* read-only after this */
BQ27000_ARTTE_L, /* At-Rate Time To Empty H L */
BQ27000_ARTTE_H,
BQ27000_TEMP_L, /* Reported Temperature H L */
BQ27000_TEMP_H,
BQ27000_VOLT_L, /* Reported Voltage H L */
BQ27000_VOLT_H,
BQ27000_FLAGS, /* Status Flags */
BQ27000_RSOC, /* Relative State of Charge */
BQ27000_NAC_L, /* Nominal Available Capacity H L */
BQ27000_NAC_H,
BQ27000_CACD_L, /* Discharge Compensated H L */
BQ27000_CACD_H,
BQ27000_CACT_L, /* Temperature Compensated H L */
BQ27000_CACT_H,
BQ27000_LMD_L, /* Last measured discharge H L */
BQ27000_LMD_H,
BQ27000_AI_L, /* Average Current H L */
BQ27000_AI_H,
BQ27000_TTE_L, /* Time to Empty H L */
BQ27000_TTE_H,
BQ27000_TTF_L, /* Time to Full H L */
BQ27000_TTF_H,
BQ27000_SI_L, /* Standby Current H L */
BQ27000_SI_H,
BQ27000_STTE_L, /* Standby Time To Empty H L */
BQ27000_STTE_H,
BQ27000_MLI_L, /* Max Load Current H L */
BQ27000_MLI_H,
BQ27000_MLTTE_L, /* Max Load Time To Empty H L */
BQ27000_MLTTE_H,
BQ27000_SAE_L, /* Available Energy H L */
BQ27000_SAE_H,
BQ27000_AP_L, /* Available Power H L */
BQ27000_AP_H,
BQ27000_TTECP_L, /* Time to Empty at Constant Power H L */
BQ27000_TTECP_H,
BQ27000_CYCL_L, /* Cycle count since learning cycle H L */
BQ27000_CYCL_H,
BQ27000_CYCT_L, /* Cycle Count Total H L */
BQ27000_CYCT_H,
BQ27000_CSOC, /* Compensated State Of Charge */
/* EEPROM regs */
/* read-write after this */
BQ27000_EE_EE_EN = 0x6e, /* EEPROM Program Enable */
BQ27000_EE_ILMD = 0x76, /* Initial Last Measured Discharge High Byte */
BQ27000_EE_SEDVF, /* Scaled EDVF Threshold */
BQ27000_EE_SEDV1, /* Scaled EDV1 Threshold */
BQ27000_EE_ISLC, /* Initial Standby Load Current */
BQ27000_EE_DMFSD, /* Digital Magnitude Filter and Self Discharge */
BQ27000_EE_TAPER, /* Aging Estimate Enable, Charge Termination Taper */
BQ27000_EE_PKCFG, /* Pack Configuration Values */
BQ27000_EE_IMLC, /* Initial Max Load Current or ID #3 */
BQ27000_EE_DCOMP, /* Discharge rate compensation constants or ID #2 */
BQ27000_EE_TCOMP, /* Temperature Compensation constants or ID #1 */
};
enum bq27000_status_flags {
BQ27000_STATUS_CHGS = 0x80, /* 1 = being charged */
BQ27000_STATUS_NOACT = 0x40, /* 1 = no activity */
BQ27000_STATUS_IMIN = 0x20, /* 1 = Lion taper current mode */
BQ27000_STATUS_CI = 0x10, /* 1 = capacity likely innacurate */
BQ27000_STATUS_CALIP = 0x08, /* 1 = calibration in progress */
BQ27000_STATUS_VDQ = 0x04, /* 1 = capacity should be accurate */
BQ27000_STATUS_EDV1 = 0x02, /* 1 = end of discharge.. <6% left */
BQ27000_STATUS_EDVF = 0x01, /* 1 = no, it's really empty now */
};
#define NANOVOLTS_UNIT 3750
struct bq27000_bat_regs {
int ai;
int flags;
int lmd;
int rsoc;
int temp;
int tte;
int ttf;
int volt;
};
struct bq27000_device_info {
struct device *dev;
struct power_supply bat;
struct power_supply ac;
struct power_supply usb;
struct delayed_work work;
struct bq27000_platform_data *pdata;
struct bq27000_bat_regs regs;
};
static unsigned int cache_time = 5000;
module_param(cache_time, uint, 0644);
MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
/*
* reading 16 bit values over HDQ has a special hazard where the
* hdq device firmware can update the 16-bit register during the time we
* read the two halves. TI document SLUS556D recommends the algorithm here
* to avoid trouble
*/
static int hdq_read16(struct bq27000_device_info *di, int address)
{
int acc;
int high;
int retries = 3;
while (retries--) {
high = (di->pdata->hdq_read)(address + 1); /* high part */
if (high < 0)
return high;
acc = (di->pdata->hdq_read)(address);
if (acc < 0)
return acc;
/* confirm high didn't change between reading it and low */
if (high == (di->pdata->hdq_read)(address + 1))
return (high << 8) | acc;
}
return -ETIME;
}
static void bq27000_battery_external_power_changed(struct power_supply *psy)
{
struct bq27000_device_info *di = container_of(psy, struct bq27000_device_info, bat);
dev_dbg(di->dev, "%s\n", __FUNCTION__);
schedule_delayed_work(&di->work, 0);
}
static int bq27000_battery_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
int n;
struct bq27000_device_info *di = container_of(psy, struct bq27000_device_info, bat);
if (di->regs.rsoc < 0 && psp != POWER_SUPPLY_PROP_PRESENT)
return -ENODEV;
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
if (!di->pdata->get_charger_online_status)
goto use_bat;
if ((di->pdata->get_charger_online_status)()) {
/*
* charger is definitively present
* we report our state in terms of what it says it
* is doing
*/
if (!di->pdata->get_charger_active_status)
goto use_bat;
if ((di->pdata->get_charger_active_status)()) {
val->intval = POWER_SUPPLY_STATUS_CHARGING;
break;
}
val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
break;
}
/*
* platform provided definite indication of charger presence,
* and it is telling us it isn't there... but we are on so we
* must be running from battery --->
*/
val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
break;
use_bat:
/*
* either the charger is not connected, or the
* platform doesn't give info about charger, use battery state
* but... battery state can be out of date by 4 seconds or
* so... use the platform callbacks if possible.
*/
/* no real activity on the battery */
if (di->regs.ai < 2) {
if (!di->regs.ttf)
val->intval = POWER_SUPPLY_STATUS_FULL;
else
val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
break;
}
/* power is actually going in or out... */
if (di->regs.flags < 0)
return di->regs.flags;
if (di->regs.flags & BQ27000_STATUS_CHGS)
val->intval = POWER_SUPPLY_STATUS_CHARGING;
else
val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
break;
case POWER_SUPPLY_PROP_HEALTH:
val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
/* Do we have accurate readings... */
if (di->regs.flags < 0)
return di->regs.flags;
if (di->regs.flags & BQ27000_STATUS_VDQ)
val->intval = POWER_SUPPLY_HEALTH_GOOD;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
if (di->regs.volt < 0)
return di->regs.volt;
/* mV -> uV */
val->intval = di->regs.volt * 1000;
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
if (di->regs.flags < 0)
return di->regs.flags;
if (di->regs.flags & BQ27000_STATUS_CHGS)
n = -NANOVOLTS_UNIT;
else
n = NANOVOLTS_UNIT;
if (di->regs.ai < 0)
return di->regs.ai;
val->intval = (di->regs.ai * n) / di->pdata->rsense_mohms;
break;
case POWER_SUPPLY_PROP_CHARGE_FULL:
if (di->regs.lmd < 0)
return di->regs.lmd;
val->intval = (di->regs.lmd * 3570) / di->pdata->rsense_mohms;
break;
case POWER_SUPPLY_PROP_TEMP:
if (di->regs.temp < 0)
return di->regs.temp;
/* K (in 0.25K units) is 273.15 up from C (in 0.1C)*/
/* 10926 = 27315 * 4 / 10 */
val->intval = (((long)di->regs.temp * 10l) - 10926) / 4;
break;
case POWER_SUPPLY_PROP_TECHNOLOGY:
val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
break;
case POWER_SUPPLY_PROP_CAPACITY:
val->intval = di->regs.rsoc;
if (val->intval < 0)
return val->intval;
break;
case POWER_SUPPLY_PROP_PRESENT:
val->intval = !(di->regs.rsoc < 0);
break;
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
if (di->regs.tte < 0)
return di->regs.tte;
val->intval = 60 * di->regs.tte;
break;
case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
if (di->regs.ttf < 0)
return di->regs.ttf;
val->intval = 60 * di->regs.ttf;
break;
case POWER_SUPPLY_PROP_ONLINE:
if (di->pdata->get_charger_online_status)
val->intval = (di->pdata->get_charger_online_status)();
else
return -EINVAL;
break;
default:
return -EINVAL;
}
return 0;
}
static void bq27000_battery_work(struct work_struct *work)
{
struct bq27000_device_info *di =
container_of(work, struct bq27000_device_info, work.work);
if ((di->pdata->hdq_initialized)()) {
struct bq27000_bat_regs regs;
regs.ai = hdq_read16(di, BQ27000_AI_L);
regs.flags = (di->pdata->hdq_read)(BQ27000_FLAGS);
regs.lmd = hdq_read16(di, BQ27000_LMD_L);
regs.rsoc = (di->pdata->hdq_read)(BQ27000_RSOC);
regs.temp = hdq_read16(di, BQ27000_TEMP_L);
regs.tte = hdq_read16(di, BQ27000_TTE_L);
regs.ttf = hdq_read16(di, BQ27000_TTF_L);
regs.volt = hdq_read16(di, BQ27000_VOLT_L);
if (memcmp (&regs, &di->regs, sizeof(regs)) != 0) {
di->regs = regs;
power_supply_changed(&di->bat);
}
}
if (!schedule_delayed_work(&di->work, cache_time))
dev_err(di->dev, "battery service reschedule failed\n");
}
static enum power_supply_property bq27000_battery_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_CHARGE_FULL,
POWER_SUPPLY_PROP_TEMP,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
POWER_SUPPLY_PROP_CAPACITY,
POWER_SUPPLY_PROP_ONLINE
};
static int bq27000_battery_probe(struct platform_device *pdev)
{
int retval = 0;
struct bq27000_device_info *di;
struct bq27000_platform_data *pdata;
dev_info(&pdev->dev, "BQ27000 Battery Driver (C) 2008 Openmoko, Inc\n");
di = kzalloc(sizeof(*di), GFP_KERNEL);
if (!di) {
retval = -ENOMEM;
goto di_alloc_failed;
}
platform_set_drvdata(pdev, di);
pdata = pdev->dev.platform_data;
di->dev = &pdev->dev;
/* di->w1_dev = pdev->dev.parent; */
di->bat.name = pdata->name;
di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
di->bat.properties = bq27000_battery_props;
di->bat.num_properties = ARRAY_SIZE(bq27000_battery_props);
di->bat.get_property = bq27000_battery_get_property;
di->bat.external_power_changed =
bq27000_battery_external_power_changed;
di->bat.use_for_apm = 1;
di->pdata = pdata;
retval = power_supply_register(&pdev->dev, &di->bat);
if (retval) {
dev_err(di->dev, "failed to register battery\n");
goto batt_failed;
}
INIT_DELAYED_WORK(&di->work, bq27000_battery_work);
if (!schedule_delayed_work(&di->work, 0))
dev_err(di->dev, "failed to schedule bq27000_battery_work\n");
return 0;
batt_failed:
kfree(di);
di_alloc_failed:
return retval;
}
static int bq27000_battery_remove(struct platform_device *pdev)
{
struct bq27000_device_info *di = platform_get_drvdata(pdev);
cancel_delayed_work(&di->work);
power_supply_unregister(&di->bat);
return 0;
}
void bq27000_charging_state_change(struct platform_device *pdev)
{
struct bq27000_device_info *di = platform_get_drvdata(pdev);
if (!di)
return;
}
EXPORT_SYMBOL_GPL(bq27000_charging_state_change);
#ifdef CONFIG_PM
static int bq27000_battery_suspend(struct platform_device *pdev,
pm_message_t state)
{
struct bq27000_device_info *di = platform_get_drvdata(pdev);
cancel_delayed_work(&di->work);
return 0;
}
static int bq27000_battery_resume(struct platform_device *pdev)
{
struct bq27000_device_info *di = platform_get_drvdata(pdev);
schedule_delayed_work(&di->work, 0);
return 0;
}
#else
#define bq27000_battery_suspend NULL
#define bq27000_battery_resume NULL
#endif /* CONFIG_PM */
static struct platform_driver bq27000_battery_driver = {
.driver = {
.name = "bq27000-battery",
},
.probe = bq27000_battery_probe,
.remove = bq27000_battery_remove,
.suspend = bq27000_battery_suspend,
.resume = bq27000_battery_resume,
};
static int __init bq27000_battery_init(void)
{
return platform_driver_register(&bq27000_battery_driver);
}
static void __exit bq27000_battery_exit(void)
{
platform_driver_unregister(&bq27000_battery_driver);
}
module_init(bq27000_battery_init);
module_exit(bq27000_battery_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Andy Green <andy@openmoko.com>");
MODULE_DESCRIPTION("bq27000 battery driver");
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