mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Marek Belisko](/assets/img/avatar_default.png)
This driver is used and tested on gta04 phone. It's using twl4030_madc (similar to rx51 existing driver). Driver also implement charging and discharging calibration data so user can define ranges and level. Signed-off-by: Marek Belisko <marek@goldelico.com> Signed-off-by: Lukas Märdian <lukas@goldelico.com> Signed-off-by: Anton Vorontsov <anton@enomsg.org>
245 lines
6.4 KiB
C
245 lines
6.4 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/i2c/twl4030-madc.h>
|
|
#include <linux/power/twl4030_madc_battery.h>
|
|
|
|
struct twl4030_madc_battery {
|
|
struct power_supply psy;
|
|
struct twl4030_madc_bat_platform_data *pdata;
|
|
};
|
|
|
|
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(int index)
|
|
{
|
|
struct twl4030_madc_request req;
|
|
int val;
|
|
|
|
req.channels = index;
|
|
req.method = TWL4030_MADC_SW2;
|
|
req.type = TWL4030_MADC_WAIT;
|
|
req.do_avg = 0;
|
|
req.raw = false;
|
|
req.func_cb = NULL;
|
|
|
|
val = twl4030_madc_conversion(&req);
|
|
if (val < 0)
|
|
return val;
|
|
|
|
return req.rbuf[ffs(index) - 1];
|
|
}
|
|
|
|
static int twl4030_madc_bat_get_charging_status(void)
|
|
{
|
|
return (madc_read(TWL4030_MADC_ICHG) > 0) ? 1 : 0;
|
|
}
|
|
|
|
static int twl4030_madc_bat_get_voltage(void)
|
|
{
|
|
return madc_read(TWL4030_MADC_VBAT);
|
|
}
|
|
|
|
static int twl4030_madc_bat_get_current(void)
|
|
{
|
|
return madc_read(TWL4030_MADC_ICHG) * 1000;
|
|
}
|
|
|
|
static int twl4030_madc_bat_get_temp(void)
|
|
{
|
|
return madc_read(TWL4030_MADC_BTEMP) * 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())
|
|
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 = container_of(psy,
|
|
struct twl4030_madc_battery, psy);
|
|
|
|
switch (psp) {
|
|
case POWER_SUPPLY_PROP_STATUS:
|
|
if (twl4030_madc_bat_voltscale(bat,
|
|
twl4030_madc_bat_get_voltage()) > 95)
|
|
val->intval = POWER_SUPPLY_STATUS_FULL;
|
|
else {
|
|
if (twl4030_madc_bat_get_charging_status())
|
|
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() * 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();
|
|
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());
|
|
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());
|
|
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();
|
|
break;
|
|
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: {
|
|
int percent = twl4030_madc_bat_voltscale(bat,
|
|
twl4030_madc_bat_get_voltage());
|
|
/* 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)
|
|
{
|
|
struct twl4030_madc_battery *bat = container_of(psy,
|
|
struct twl4030_madc_battery, psy);
|
|
|
|
power_supply_changed(&bat->psy);
|
|
}
|
|
|
|
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;
|
|
|
|
twl4030_madc_bat = kzalloc(sizeof(*twl4030_madc_bat), GFP_KERNEL);
|
|
if (!twl4030_madc_bat)
|
|
return -ENOMEM;
|
|
|
|
twl4030_madc_bat->psy.name = "twl4030_battery";
|
|
twl4030_madc_bat->psy.type = POWER_SUPPLY_TYPE_BATTERY;
|
|
twl4030_madc_bat->psy.properties = twl4030_madc_bat_props;
|
|
twl4030_madc_bat->psy.num_properties =
|
|
ARRAY_SIZE(twl4030_madc_bat_props);
|
|
twl4030_madc_bat->psy.get_property = twl4030_madc_bat_get_property;
|
|
twl4030_madc_bat->psy.external_power_changed =
|
|
twl4030_madc_bat_ext_changed;
|
|
|
|
/* 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);
|
|
power_supply_register(&pdev->dev, &twl4030_madc_bat->psy);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int twl4030_madc_battery_remove(struct platform_device *pdev)
|
|
{
|
|
struct twl4030_madc_battery *bat = platform_get_drvdata(pdev);
|
|
|
|
power_supply_unregister(&bat->psy);
|
|
kfree(bat);
|
|
|
|
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");
|