mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-29 15:43:59 +08:00
e9574c14fd
Avoid inclusion of unused twl4030-madc.h. This will allow twl4030-madc.h to be merged into the iio driver. Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
278 lines
7.4 KiB
C
278 lines
7.4 KiB
C
/*
|
|
* Dumb driver for LiIon batteries using TWL4030 madc.
|
|
*
|
|
* Copyright 2013 Golden Delicious Computers
|
|
* Lukas Märdian <lukas@goldelico.com>
|
|
*
|
|
* Based on dumb driver for gta01 battery
|
|
* Copyright 2009 Openmoko, Inc
|
|
* Balaji Rao <balajirrao@openmoko.org>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/param.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/power_supply.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/sort.h>
|
|
#include <linux/power/twl4030_madc_battery.h>
|
|
#include <linux/iio/consumer.h>
|
|
|
|
struct twl4030_madc_battery {
|
|
struct power_supply *psy;
|
|
struct twl4030_madc_bat_platform_data *pdata;
|
|
struct iio_channel *channel_temp;
|
|
struct iio_channel *channel_ichg;
|
|
struct iio_channel *channel_vbat;
|
|
};
|
|
|
|
static enum power_supply_property twl4030_madc_bat_props[] = {
|
|
POWER_SUPPLY_PROP_PRESENT,
|
|
POWER_SUPPLY_PROP_STATUS,
|
|
POWER_SUPPLY_PROP_TECHNOLOGY,
|
|
POWER_SUPPLY_PROP_VOLTAGE_NOW,
|
|
POWER_SUPPLY_PROP_CURRENT_NOW,
|
|
POWER_SUPPLY_PROP_CAPACITY,
|
|
POWER_SUPPLY_PROP_CHARGE_FULL,
|
|
POWER_SUPPLY_PROP_CHARGE_NOW,
|
|
POWER_SUPPLY_PROP_TEMP,
|
|
POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
|
|
};
|
|
|
|
static int madc_read(struct iio_channel *channel)
|
|
{
|
|
int val, err;
|
|
err = iio_read_channel_processed(channel, &val);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return val;
|
|
}
|
|
|
|
static int twl4030_madc_bat_get_charging_status(struct twl4030_madc_battery *bt)
|
|
{
|
|
return (madc_read(bt->channel_ichg) > 0) ? 1 : 0;
|
|
}
|
|
|
|
static int twl4030_madc_bat_get_voltage(struct twl4030_madc_battery *bt)
|
|
{
|
|
return madc_read(bt->channel_vbat);
|
|
}
|
|
|
|
static int twl4030_madc_bat_get_current(struct twl4030_madc_battery *bt)
|
|
{
|
|
return madc_read(bt->channel_ichg) * 1000;
|
|
}
|
|
|
|
static int twl4030_madc_bat_get_temp(struct twl4030_madc_battery *bt)
|
|
{
|
|
return madc_read(bt->channel_temp) * 10;
|
|
}
|
|
|
|
static int twl4030_madc_bat_voltscale(struct twl4030_madc_battery *bat,
|
|
int volt)
|
|
{
|
|
struct twl4030_madc_bat_calibration *calibration;
|
|
int i, res = 0;
|
|
|
|
/* choose charging curve */
|
|
if (twl4030_madc_bat_get_charging_status(bat))
|
|
calibration = bat->pdata->charging;
|
|
else
|
|
calibration = bat->pdata->discharging;
|
|
|
|
if (volt > calibration[0].voltage) {
|
|
res = calibration[0].level;
|
|
} else {
|
|
for (i = 0; calibration[i+1].voltage >= 0; i++) {
|
|
if (volt <= calibration[i].voltage &&
|
|
volt >= calibration[i+1].voltage) {
|
|
/* interval found - interpolate within range */
|
|
res = calibration[i].level -
|
|
((calibration[i].voltage - volt) *
|
|
(calibration[i].level -
|
|
calibration[i+1].level)) /
|
|
(calibration[i].voltage -
|
|
calibration[i+1].voltage);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return res;
|
|
}
|
|
|
|
static int twl4030_madc_bat_get_property(struct power_supply *psy,
|
|
enum power_supply_property psp,
|
|
union power_supply_propval *val)
|
|
{
|
|
struct twl4030_madc_battery *bat = power_supply_get_drvdata(psy);
|
|
|
|
switch (psp) {
|
|
case POWER_SUPPLY_PROP_STATUS:
|
|
if (twl4030_madc_bat_voltscale(bat,
|
|
twl4030_madc_bat_get_voltage(bat)) > 95)
|
|
val->intval = POWER_SUPPLY_STATUS_FULL;
|
|
else {
|
|
if (twl4030_madc_bat_get_charging_status(bat))
|
|
val->intval = POWER_SUPPLY_STATUS_CHARGING;
|
|
else
|
|
val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
|
|
}
|
|
break;
|
|
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
|
|
val->intval = twl4030_madc_bat_get_voltage(bat) * 1000;
|
|
break;
|
|
case POWER_SUPPLY_PROP_TECHNOLOGY:
|
|
val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
|
|
break;
|
|
case POWER_SUPPLY_PROP_CURRENT_NOW:
|
|
val->intval = twl4030_madc_bat_get_current(bat);
|
|
break;
|
|
case POWER_SUPPLY_PROP_PRESENT:
|
|
/* assume battery is always present */
|
|
val->intval = 1;
|
|
break;
|
|
case POWER_SUPPLY_PROP_CHARGE_NOW: {
|
|
int percent = twl4030_madc_bat_voltscale(bat,
|
|
twl4030_madc_bat_get_voltage(bat));
|
|
val->intval = (percent * bat->pdata->capacity) / 100;
|
|
break;
|
|
}
|
|
case POWER_SUPPLY_PROP_CAPACITY:
|
|
val->intval = twl4030_madc_bat_voltscale(bat,
|
|
twl4030_madc_bat_get_voltage(bat));
|
|
break;
|
|
case POWER_SUPPLY_PROP_CHARGE_FULL:
|
|
val->intval = bat->pdata->capacity;
|
|
break;
|
|
case POWER_SUPPLY_PROP_TEMP:
|
|
val->intval = twl4030_madc_bat_get_temp(bat);
|
|
break;
|
|
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: {
|
|
int percent = twl4030_madc_bat_voltscale(bat,
|
|
twl4030_madc_bat_get_voltage(bat));
|
|
/* in mAh */
|
|
int chg = (percent * (bat->pdata->capacity/1000))/100;
|
|
|
|
/* assume discharge with 400 mA (ca. 1.5W) */
|
|
val->intval = (3600l * chg) / 400;
|
|
break;
|
|
}
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void twl4030_madc_bat_ext_changed(struct power_supply *psy)
|
|
{
|
|
power_supply_changed(psy);
|
|
}
|
|
|
|
static const struct power_supply_desc twl4030_madc_bat_desc = {
|
|
.name = "twl4030_battery",
|
|
.type = POWER_SUPPLY_TYPE_BATTERY,
|
|
.properties = twl4030_madc_bat_props,
|
|
.num_properties = ARRAY_SIZE(twl4030_madc_bat_props),
|
|
.get_property = twl4030_madc_bat_get_property,
|
|
.external_power_changed = twl4030_madc_bat_ext_changed,
|
|
|
|
};
|
|
|
|
static int twl4030_cmp(const void *a, const void *b)
|
|
{
|
|
return ((struct twl4030_madc_bat_calibration *)b)->voltage -
|
|
((struct twl4030_madc_bat_calibration *)a)->voltage;
|
|
}
|
|
|
|
static int twl4030_madc_battery_probe(struct platform_device *pdev)
|
|
{
|
|
struct twl4030_madc_battery *twl4030_madc_bat;
|
|
struct twl4030_madc_bat_platform_data *pdata = pdev->dev.platform_data;
|
|
struct power_supply_config psy_cfg = {};
|
|
int ret = 0;
|
|
|
|
twl4030_madc_bat = devm_kzalloc(&pdev->dev, sizeof(*twl4030_madc_bat),
|
|
GFP_KERNEL);
|
|
if (!twl4030_madc_bat)
|
|
return -ENOMEM;
|
|
|
|
twl4030_madc_bat->channel_temp = iio_channel_get(&pdev->dev, "temp");
|
|
if (IS_ERR(twl4030_madc_bat->channel_temp)) {
|
|
ret = PTR_ERR(twl4030_madc_bat->channel_temp);
|
|
goto err;
|
|
}
|
|
|
|
twl4030_madc_bat->channel_ichg = iio_channel_get(&pdev->dev, "ichg");
|
|
if (IS_ERR(twl4030_madc_bat->channel_ichg)) {
|
|
ret = PTR_ERR(twl4030_madc_bat->channel_ichg);
|
|
goto err_temp;
|
|
}
|
|
|
|
twl4030_madc_bat->channel_vbat = iio_channel_get(&pdev->dev, "vbat");
|
|
if (IS_ERR(twl4030_madc_bat->channel_vbat)) {
|
|
ret = PTR_ERR(twl4030_madc_bat->channel_vbat);
|
|
goto err_ichg;
|
|
}
|
|
|
|
/* sort charging and discharging calibration data */
|
|
sort(pdata->charging, pdata->charging_size,
|
|
sizeof(struct twl4030_madc_bat_calibration),
|
|
twl4030_cmp, NULL);
|
|
sort(pdata->discharging, pdata->discharging_size,
|
|
sizeof(struct twl4030_madc_bat_calibration),
|
|
twl4030_cmp, NULL);
|
|
|
|
twl4030_madc_bat->pdata = pdata;
|
|
platform_set_drvdata(pdev, twl4030_madc_bat);
|
|
psy_cfg.drv_data = twl4030_madc_bat;
|
|
twl4030_madc_bat->psy = power_supply_register(&pdev->dev,
|
|
&twl4030_madc_bat_desc,
|
|
&psy_cfg);
|
|
if (IS_ERR(twl4030_madc_bat->psy)) {
|
|
ret = PTR_ERR(twl4030_madc_bat->psy);
|
|
goto err_vbat;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_vbat:
|
|
iio_channel_release(twl4030_madc_bat->channel_vbat);
|
|
err_ichg:
|
|
iio_channel_release(twl4030_madc_bat->channel_ichg);
|
|
err_temp:
|
|
iio_channel_release(twl4030_madc_bat->channel_temp);
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
static int twl4030_madc_battery_remove(struct platform_device *pdev)
|
|
{
|
|
struct twl4030_madc_battery *bat = platform_get_drvdata(pdev);
|
|
|
|
power_supply_unregister(bat->psy);
|
|
|
|
iio_channel_release(bat->channel_vbat);
|
|
iio_channel_release(bat->channel_ichg);
|
|
iio_channel_release(bat->channel_temp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver twl4030_madc_battery_driver = {
|
|
.driver = {
|
|
.name = "twl4030_madc_battery",
|
|
},
|
|
.probe = twl4030_madc_battery_probe,
|
|
.remove = twl4030_madc_battery_remove,
|
|
};
|
|
module_platform_driver(twl4030_madc_battery_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Lukas Märdian <lukas@goldelico.com>");
|
|
MODULE_DESCRIPTION("twl4030_madc battery driver");
|
|
MODULE_ALIAS("platform:twl4030_madc_battery");
|