454 lines
11 KiB
C
454 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// iPAQ h1930/h1940/rx1950 battery controller driver
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// Copyright (c) Vasily Khoruzhick
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// Based on h1940_battery.c by Arnaud Patard
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#include <linux/interrupt.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/leds.h>
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#include <linux/gpio/consumer.h>
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#include <linux/err.h>
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#include <linux/timer.h>
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#include <linux/jiffies.h>
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#include <linux/s3c_adc_battery.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/soc/samsung/s3c-adc.h>
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#define BAT_POLL_INTERVAL 10000 /* ms */
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#define JITTER_DELAY 500 /* ms */
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struct s3c_adc_bat {
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struct power_supply *psy;
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struct s3c_adc_client *client;
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struct s3c_adc_bat_pdata *pdata;
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struct gpio_desc *charge_finished;
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int volt_value;
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int cur_value;
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unsigned int timestamp;
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int level;
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int status;
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int cable_plugged:1;
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};
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static struct delayed_work bat_work;
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static void s3c_adc_bat_ext_power_changed(struct power_supply *psy)
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{
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schedule_delayed_work(&bat_work,
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msecs_to_jiffies(JITTER_DELAY));
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}
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static int gather_samples(struct s3c_adc_client *client, int num, int channel)
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{
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int value, i;
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/* default to 1 if nothing is set */
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if (num < 1)
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num = 1;
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value = 0;
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for (i = 0; i < num; i++)
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value += s3c_adc_read(client, channel);
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value /= num;
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return value;
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}
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static enum power_supply_property s3c_adc_backup_bat_props[] = {
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_VOLTAGE_MIN,
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POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
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};
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static int s3c_adc_backup_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 s3c_adc_bat *bat = power_supply_get_drvdata(psy);
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if (!bat) {
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dev_err(&psy->dev, "%s: no battery infos ?!\n", __func__);
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return -EINVAL;
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}
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if (bat->volt_value < 0 ||
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jiffies_to_msecs(jiffies - bat->timestamp) >
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BAT_POLL_INTERVAL) {
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bat->volt_value = gather_samples(bat->client,
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bat->pdata->backup_volt_samples,
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bat->pdata->backup_volt_channel);
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bat->volt_value *= bat->pdata->backup_volt_mult;
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bat->timestamp = jiffies;
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}
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switch (psp) {
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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val->intval = bat->volt_value;
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return 0;
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case POWER_SUPPLY_PROP_VOLTAGE_MIN:
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val->intval = bat->pdata->backup_volt_min;
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return 0;
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case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
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val->intval = bat->pdata->backup_volt_max;
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return 0;
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default:
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return -EINVAL;
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}
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}
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static const struct power_supply_desc backup_bat_desc = {
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.name = "backup-battery",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.properties = s3c_adc_backup_bat_props,
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.num_properties = ARRAY_SIZE(s3c_adc_backup_bat_props),
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.get_property = s3c_adc_backup_bat_get_property,
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.use_for_apm = 1,
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};
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static struct s3c_adc_bat backup_bat;
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static enum power_supply_property s3c_adc_main_bat_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
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POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
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POWER_SUPPLY_PROP_CHARGE_NOW,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_CURRENT_NOW,
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};
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static int calc_full_volt(int volt_val, int cur_val, int impedance)
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{
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return volt_val + cur_val * impedance / 1000;
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}
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static int charge_finished(struct s3c_adc_bat *bat)
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{
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return gpiod_get_value(bat->charge_finished);
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}
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static int s3c_adc_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 s3c_adc_bat *bat = power_supply_get_drvdata(psy);
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int new_level;
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int full_volt;
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const struct s3c_adc_bat_thresh *lut;
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unsigned int lut_size;
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if (!bat) {
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dev_err(&psy->dev, "no battery infos ?!\n");
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return -EINVAL;
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}
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lut = bat->pdata->lut_noac;
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lut_size = bat->pdata->lut_noac_cnt;
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if (bat->volt_value < 0 || bat->cur_value < 0 ||
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jiffies_to_msecs(jiffies - bat->timestamp) >
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BAT_POLL_INTERVAL) {
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bat->volt_value = gather_samples(bat->client,
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bat->pdata->volt_samples,
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bat->pdata->volt_channel) * bat->pdata->volt_mult;
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bat->cur_value = gather_samples(bat->client,
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bat->pdata->current_samples,
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bat->pdata->current_channel) * bat->pdata->current_mult;
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bat->timestamp = jiffies;
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}
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if (bat->cable_plugged &&
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(!bat->charge_finished ||
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!charge_finished(bat))) {
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lut = bat->pdata->lut_acin;
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lut_size = bat->pdata->lut_acin_cnt;
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}
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new_level = 100000;
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full_volt = calc_full_volt((bat->volt_value / 1000),
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(bat->cur_value / 1000), bat->pdata->internal_impedance);
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if (full_volt < calc_full_volt(lut->volt, lut->cur,
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bat->pdata->internal_impedance)) {
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lut_size--;
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while (lut_size--) {
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int lut_volt1;
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int lut_volt2;
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lut_volt1 = calc_full_volt(lut[0].volt, lut[0].cur,
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bat->pdata->internal_impedance);
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lut_volt2 = calc_full_volt(lut[1].volt, lut[1].cur,
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bat->pdata->internal_impedance);
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if (full_volt < lut_volt1 && full_volt >= lut_volt2) {
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new_level = (lut[1].level +
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(lut[0].level - lut[1].level) *
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(full_volt - lut_volt2) /
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(lut_volt1 - lut_volt2)) * 1000;
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break;
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}
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new_level = lut[1].level * 1000;
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lut++;
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}
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}
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bat->level = new_level;
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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if (!bat->charge_finished)
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val->intval = bat->level == 100000 ?
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POWER_SUPPLY_STATUS_FULL : bat->status;
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else
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val->intval = bat->status;
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return 0;
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case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
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val->intval = 100000;
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return 0;
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case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
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val->intval = 0;
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return 0;
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case POWER_SUPPLY_PROP_CHARGE_NOW:
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val->intval = bat->level;
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return 0;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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val->intval = bat->volt_value;
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return 0;
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case POWER_SUPPLY_PROP_CURRENT_NOW:
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val->intval = bat->cur_value;
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return 0;
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default:
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return -EINVAL;
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}
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}
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static const struct power_supply_desc main_bat_desc = {
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.name = "main-battery",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.properties = s3c_adc_main_bat_props,
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.num_properties = ARRAY_SIZE(s3c_adc_main_bat_props),
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.get_property = s3c_adc_bat_get_property,
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.external_power_changed = s3c_adc_bat_ext_power_changed,
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.use_for_apm = 1,
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};
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static struct s3c_adc_bat main_bat;
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static void s3c_adc_bat_work(struct work_struct *work)
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{
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struct s3c_adc_bat *bat = &main_bat;
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int is_charged;
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int is_plugged;
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static int was_plugged;
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is_plugged = power_supply_am_i_supplied(bat->psy);
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bat->cable_plugged = is_plugged;
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if (is_plugged != was_plugged) {
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was_plugged = is_plugged;
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if (is_plugged) {
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if (bat->pdata->enable_charger)
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bat->pdata->enable_charger();
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bat->status = POWER_SUPPLY_STATUS_CHARGING;
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} else {
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if (bat->pdata->disable_charger)
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bat->pdata->disable_charger();
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bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
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}
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} else {
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if (bat->charge_finished && is_plugged) {
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is_charged = charge_finished(&main_bat);
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if (is_charged) {
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if (bat->pdata->disable_charger)
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bat->pdata->disable_charger();
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bat->status = POWER_SUPPLY_STATUS_FULL;
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} else {
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if (bat->pdata->enable_charger)
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bat->pdata->enable_charger();
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bat->status = POWER_SUPPLY_STATUS_CHARGING;
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}
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}
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}
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power_supply_changed(bat->psy);
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}
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static irqreturn_t s3c_adc_bat_charged(int irq, void *dev_id)
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{
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schedule_delayed_work(&bat_work,
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msecs_to_jiffies(JITTER_DELAY));
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return IRQ_HANDLED;
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}
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static int s3c_adc_bat_probe(struct platform_device *pdev)
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{
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struct s3c_adc_client *client;
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struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
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struct power_supply_config psy_cfg = {};
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struct gpio_desc *gpiod;
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int ret;
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client = s3c_adc_register(pdev, NULL, NULL, 0);
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if (IS_ERR(client)) {
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dev_err(&pdev->dev, "cannot register adc\n");
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return PTR_ERR(client);
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}
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platform_set_drvdata(pdev, client);
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gpiod = devm_gpiod_get_optional(&pdev->dev, "charge-status", GPIOD_IN);
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if (IS_ERR(gpiod)) {
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/* Could be probe deferral etc */
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ret = PTR_ERR(gpiod);
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dev_err(&pdev->dev, "no GPIO %d\n", ret);
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return ret;
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}
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main_bat.client = client;
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main_bat.pdata = pdata;
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main_bat.charge_finished = gpiod;
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main_bat.volt_value = -1;
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main_bat.cur_value = -1;
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main_bat.cable_plugged = 0;
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main_bat.status = POWER_SUPPLY_STATUS_DISCHARGING;
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psy_cfg.drv_data = &main_bat;
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main_bat.psy = power_supply_register(&pdev->dev, &main_bat_desc, &psy_cfg);
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if (IS_ERR(main_bat.psy)) {
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ret = PTR_ERR(main_bat.psy);
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goto err_reg_main;
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}
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if (pdata->backup_volt_mult) {
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const struct power_supply_config backup_psy_cfg
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= { .drv_data = &backup_bat, };
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backup_bat.client = client;
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backup_bat.pdata = pdev->dev.platform_data;
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backup_bat.charge_finished = gpiod;
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backup_bat.volt_value = -1;
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backup_bat.psy = power_supply_register(&pdev->dev,
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&backup_bat_desc,
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&backup_psy_cfg);
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if (IS_ERR(backup_bat.psy)) {
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ret = PTR_ERR(backup_bat.psy);
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goto err_reg_backup;
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}
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}
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INIT_DELAYED_WORK(&bat_work, s3c_adc_bat_work);
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if (gpiod) {
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ret = request_irq(gpiod_to_irq(gpiod),
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s3c_adc_bat_charged,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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"battery charged", NULL);
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if (ret)
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goto err_irq;
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}
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if (pdata->init) {
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ret = pdata->init();
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if (ret)
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goto err_platform;
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}
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dev_info(&pdev->dev, "successfully loaded\n");
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device_init_wakeup(&pdev->dev, 1);
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/* Schedule timer to check current status */
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schedule_delayed_work(&bat_work,
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msecs_to_jiffies(JITTER_DELAY));
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return 0;
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err_platform:
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if (gpiod)
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free_irq(gpiod_to_irq(gpiod), NULL);
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err_irq:
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if (pdata->backup_volt_mult)
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power_supply_unregister(backup_bat.psy);
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err_reg_backup:
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power_supply_unregister(main_bat.psy);
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err_reg_main:
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return ret;
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}
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static int s3c_adc_bat_remove(struct platform_device *pdev)
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{
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struct s3c_adc_client *client = platform_get_drvdata(pdev);
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struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
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power_supply_unregister(main_bat.psy);
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if (pdata->backup_volt_mult)
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power_supply_unregister(backup_bat.psy);
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s3c_adc_release(client);
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if (main_bat.charge_finished)
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free_irq(gpiod_to_irq(main_bat.charge_finished), NULL);
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cancel_delayed_work_sync(&bat_work);
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if (pdata->exit)
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pdata->exit();
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return 0;
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}
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#ifdef CONFIG_PM
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static int s3c_adc_bat_suspend(struct platform_device *pdev,
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pm_message_t state)
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{
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if (main_bat.charge_finished) {
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if (device_may_wakeup(&pdev->dev))
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enable_irq_wake(
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gpiod_to_irq(main_bat.charge_finished));
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else {
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disable_irq(gpiod_to_irq(main_bat.charge_finished));
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main_bat.pdata->disable_charger();
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}
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}
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return 0;
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}
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static int s3c_adc_bat_resume(struct platform_device *pdev)
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{
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if (main_bat.charge_finished) {
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if (device_may_wakeup(&pdev->dev))
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disable_irq_wake(
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gpiod_to_irq(main_bat.charge_finished));
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else
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enable_irq(gpiod_to_irq(main_bat.charge_finished));
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}
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/* Schedule timer to check current status */
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schedule_delayed_work(&bat_work,
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msecs_to_jiffies(JITTER_DELAY));
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return 0;
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}
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#else
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#define s3c_adc_bat_suspend NULL
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#define s3c_adc_bat_resume NULL
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#endif
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static struct platform_driver s3c_adc_bat_driver = {
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.driver = {
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.name = "s3c-adc-battery",
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},
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.probe = s3c_adc_bat_probe,
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.remove = s3c_adc_bat_remove,
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.suspend = s3c_adc_bat_suspend,
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.resume = s3c_adc_bat_resume,
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};
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module_platform_driver(s3c_adc_bat_driver);
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MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");
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MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver");
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MODULE_LICENSE("GPL");
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