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/*
* iPAQ h1930/h1940/rx1950 battery controller driver
* Copyright (c) Vasily Khoruzhick
* Based on h1940_battery.c by Arnaud Patard
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*
*/
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/leds.h>
#include <linux/gpio.h>
#include <linux/err.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
#include <linux/s3c_adc_battery.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <plat/adc.h>
#define BAT_POLL_INTERVAL 10000 /* ms */
#define JITTER_DELAY 500 /* ms */
struct s3c_adc_bat {
struct power_supply psy;
struct s3c_adc_client *client;
struct s3c_adc_bat_pdata *pdata;
int volt_value;
int cur_value;
unsigned int timestamp;
int level;
int status;
int cable_plugged:1;
};
static struct delayed_work bat_work;
static void s3c_adc_bat_ext_power_changed(struct power_supply *psy)
{
schedule_delayed_work(&bat_work,
msecs_to_jiffies(JITTER_DELAY));
}
static int gather_samples(struct s3c_adc_client *client, int num, int channel)
{
int value, i;
/* default to 1 if nothing is set */
if (num < 1)
num = 1;
value = 0;
for (i = 0; i < num; i++)
value += s3c_adc_read(client, channel);
value /= num;
return value;
}
static enum power_supply_property s3c_adc_backup_bat_props[] = {
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_VOLTAGE_MIN,
POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
};
static int s3c_adc_backup_bat_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy);
if (!bat) {
dev_err(psy->dev, "%s: no battery infos ?!\n", __func__);
return -EINVAL;
}
if (bat->volt_value < 0 ||
jiffies_to_msecs(jiffies - bat->timestamp) >
BAT_POLL_INTERVAL) {
bat->volt_value = gather_samples(bat->client,
bat->pdata->backup_volt_samples,
bat->pdata->backup_volt_channel);
bat->volt_value *= bat->pdata->backup_volt_mult;
bat->timestamp = jiffies;
}
switch (psp) {
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
val->intval = bat->volt_value;
return 0;
case POWER_SUPPLY_PROP_VOLTAGE_MIN:
val->intval = bat->pdata->backup_volt_min;
return 0;
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
val->intval = bat->pdata->backup_volt_max;
return 0;
default:
return -EINVAL;
}
}
static struct s3c_adc_bat backup_bat = {
.psy = {
.name = "backup-battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = s3c_adc_backup_bat_props,
.num_properties = ARRAY_SIZE(s3c_adc_backup_bat_props),
.get_property = s3c_adc_backup_bat_get_property,
.use_for_apm = 1,
},
};
static enum power_supply_property s3c_adc_main_bat_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
POWER_SUPPLY_PROP_CHARGE_NOW,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CURRENT_NOW,
};
static int calc_full_volt(int volt_val, int cur_val, int impedance)
{
return volt_val + cur_val * impedance / 1000;
}
static int charge_finished(struct s3c_adc_bat *bat)
{
return bat->pdata->gpio_inverted ?
!gpio_get_value(bat->pdata->gpio_charge_finished) :
gpio_get_value(bat->pdata->gpio_charge_finished);
}
static int s3c_adc_bat_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy);
int new_level;
int full_volt;
const struct s3c_adc_bat_thresh *lut;
unsigned int lut_size;
if (!bat) {
dev_err(psy->dev, "no battery infos ?!\n");
return -EINVAL;
}
lut = bat->pdata->lut_noac;
lut_size = bat->pdata->lut_noac_cnt;
if (bat->volt_value < 0 || bat->cur_value < 0 ||
jiffies_to_msecs(jiffies - bat->timestamp) >
BAT_POLL_INTERVAL) {
bat->volt_value = gather_samples(bat->client,
bat->pdata->volt_samples,
bat->pdata->volt_channel) * bat->pdata->volt_mult;
bat->cur_value = gather_samples(bat->client,
bat->pdata->current_samples,
bat->pdata->current_channel) * bat->pdata->current_mult;
bat->timestamp = jiffies;
}
if (bat->cable_plugged &&
((bat->pdata->gpio_charge_finished < 0) ||
!charge_finished(bat))) {
lut = bat->pdata->lut_acin;
lut_size = bat->pdata->lut_acin_cnt;
}
new_level = 100000;
full_volt = calc_full_volt((bat->volt_value / 1000),
(bat->cur_value / 1000), bat->pdata->internal_impedance);
if (full_volt < calc_full_volt(lut->volt, lut->cur,
bat->pdata->internal_impedance)) {
lut_size--;
while (lut_size--) {
int lut_volt1;
int lut_volt2;
lut_volt1 = calc_full_volt(lut[0].volt, lut[0].cur,
bat->pdata->internal_impedance);
lut_volt2 = calc_full_volt(lut[1].volt, lut[1].cur,
bat->pdata->internal_impedance);
if (full_volt < lut_volt1 && full_volt >= lut_volt2) {
new_level = (lut[1].level +
(lut[0].level - lut[1].level) *
(full_volt - lut_volt2) /
(lut_volt1 - lut_volt2)) * 1000;
break;
}
new_level = lut[1].level * 1000;
lut++;
}
}
bat->level = new_level;
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
if (bat->pdata->gpio_charge_finished < 0)
val->intval = bat->level == 100000 ?
POWER_SUPPLY_STATUS_FULL : bat->status;
else
val->intval = bat->status;
return 0;
case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
val->intval = 100000;
return 0;
case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
val->intval = 0;
return 0;
case POWER_SUPPLY_PROP_CHARGE_NOW:
val->intval = bat->level;
return 0;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
val->intval = bat->volt_value;
return 0;
case POWER_SUPPLY_PROP_CURRENT_NOW:
val->intval = bat->cur_value;
return 0;
default:
return -EINVAL;
}
}
static struct s3c_adc_bat main_bat = {
.psy = {
.name = "main-battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = s3c_adc_main_bat_props,
.num_properties = ARRAY_SIZE(s3c_adc_main_bat_props),
.get_property = s3c_adc_bat_get_property,
.external_power_changed = s3c_adc_bat_ext_power_changed,
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