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