+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-//
-// iPAQ h1930/h1940/rx1950 battery controller driver
-// Copyright (c) Vasily Khoruzhick
-// Based on h1940_battery.c by Arnaud Patard
-
-#include <linux/interrupt.h>
-#include <linux/platform_device.h>
-#include <linux/power_supply.h>
-#include <linux/leds.h>
-#include <linux/gpio/consumer.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 <linux/soc/samsung/s3c-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;
- struct gpio_desc *charge_finished;
- 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 = power_supply_get_drvdata(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 const struct power_supply_desc backup_bat_desc = {
- .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 struct s3c_adc_bat backup_bat;
-
-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 gpiod_get_value(bat->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 = power_supply_get_drvdata(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->charge_finished ||
- !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->charge_finished)
- 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 const struct power_supply_desc main_bat_desc = {
- .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,
- .use_for_apm = 1,
-};
-
-static struct s3c_adc_bat main_bat;
-
-static void s3c_adc_bat_work(struct work_struct *work)
-{
- struct s3c_adc_bat *bat = &main_bat;
- int is_charged;
- int is_plugged;
- static int was_plugged;
-
- is_plugged = power_supply_am_i_supplied(bat->psy);
- bat->cable_plugged = is_plugged;
- if (is_plugged != was_plugged) {
- was_plugged = is_plugged;
- if (is_plugged) {
- if (bat->pdata->enable_charger)
- bat->pdata->enable_charger();
- bat->status = POWER_SUPPLY_STATUS_CHARGING;
- } else {
- if (bat->pdata->disable_charger)
- bat->pdata->disable_charger();
- bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
- }
- } else {
- if (bat->charge_finished && is_plugged) {
- is_charged = charge_finished(&main_bat);
- if (is_charged) {
- if (bat->pdata->disable_charger)
- bat->pdata->disable_charger();
- bat->status = POWER_SUPPLY_STATUS_FULL;
- } else {
- if (bat->pdata->enable_charger)
- bat->pdata->enable_charger();
- bat->status = POWER_SUPPLY_STATUS_CHARGING;
- }
- }
- }
-
- power_supply_changed(bat->psy);
-}
-
-static irqreturn_t s3c_adc_bat_charged(int irq, void *dev_id)
-{
- schedule_delayed_work(&bat_work,
- msecs_to_jiffies(JITTER_DELAY));
- return IRQ_HANDLED;
-}
-
-static int s3c_adc_bat_probe(struct platform_device *pdev)
-{
- struct s3c_adc_client *client;
- struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
- struct power_supply_config psy_cfg = {};
- struct gpio_desc *gpiod;
- int ret;
-
- client = s3c_adc_register(pdev, NULL, NULL, 0);
- if (IS_ERR(client)) {
- dev_err(&pdev->dev, "cannot register adc\n");
- return PTR_ERR(client);
- }
-
- platform_set_drvdata(pdev, client);
-
- gpiod = devm_gpiod_get_optional(&pdev->dev, "charge-status", GPIOD_IN);
- if (IS_ERR(gpiod)) {
- /* Could be probe deferral etc */
- ret = PTR_ERR(gpiod);
- dev_err(&pdev->dev, "no GPIO %d\n", ret);
- return ret;
- }
-
- main_bat.client = client;
- main_bat.pdata = pdata;
- main_bat.charge_finished = gpiod;
- main_bat.volt_value = -1;
- main_bat.cur_value = -1;
- main_bat.cable_plugged = 0;
- main_bat.status = POWER_SUPPLY_STATUS_DISCHARGING;
- psy_cfg.drv_data = &main_bat;
-
- main_bat.psy = power_supply_register(&pdev->dev, &main_bat_desc, &psy_cfg);
- if (IS_ERR(main_bat.psy)) {
- ret = PTR_ERR(main_bat.psy);
- goto err_reg_main;
- }
- if (pdata->backup_volt_mult) {
- const struct power_supply_config backup_psy_cfg
- = { .drv_data = &backup_bat, };
-
- backup_bat.client = client;
- backup_bat.pdata = pdev->dev.platform_data;
- backup_bat.charge_finished = gpiod;
- backup_bat.volt_value = -1;
- backup_bat.psy = power_supply_register(&pdev->dev,
- &backup_bat_desc,
- &backup_psy_cfg);
- if (IS_ERR(backup_bat.psy)) {
- ret = PTR_ERR(backup_bat.psy);
- goto err_reg_backup;
- }
- }
-
- INIT_DELAYED_WORK(&bat_work, s3c_adc_bat_work);
-
- if (gpiod) {
- ret = request_irq(gpiod_to_irq(gpiod),
- s3c_adc_bat_charged,
- IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
- "battery charged", NULL);
- if (ret)
- goto err_irq;
- }
-
- if (pdata->init) {
- ret = pdata->init();
- if (ret)
- goto err_platform;
- }
-
- dev_info(&pdev->dev, "successfully loaded\n");
- device_init_wakeup(&pdev->dev, 1);
-
- /* Schedule timer to check current status */
- schedule_delayed_work(&bat_work,
- msecs_to_jiffies(JITTER_DELAY));
-
- return 0;
-
-err_platform:
- if (gpiod)
- free_irq(gpiod_to_irq(gpiod), NULL);
-err_irq:
- if (pdata->backup_volt_mult)
- power_supply_unregister(backup_bat.psy);
-err_reg_backup:
- power_supply_unregister(main_bat.psy);
-err_reg_main:
- return ret;
-}
-
-static int s3c_adc_bat_remove(struct platform_device *pdev)
-{
- struct s3c_adc_client *client = platform_get_drvdata(pdev);
- struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
-
- power_supply_unregister(main_bat.psy);
- if (pdata->backup_volt_mult)
- power_supply_unregister(backup_bat.psy);
-
- s3c_adc_release(client);
-
- if (main_bat.charge_finished)
- free_irq(gpiod_to_irq(main_bat.charge_finished), NULL);
-
- cancel_delayed_work_sync(&bat_work);
-
- if (pdata->exit)
- pdata->exit();
-
- return 0;
-}
-
-#ifdef CONFIG_PM
-static int s3c_adc_bat_suspend(struct platform_device *pdev,
- pm_message_t state)
-{
- if (main_bat.charge_finished) {
- if (device_may_wakeup(&pdev->dev))
- enable_irq_wake(
- gpiod_to_irq(main_bat.charge_finished));
- else {
- disable_irq(gpiod_to_irq(main_bat.charge_finished));
- main_bat.pdata->disable_charger();
- }
- }
-
- return 0;
-}
-
-static int s3c_adc_bat_resume(struct platform_device *pdev)
-{
- if (main_bat.charge_finished) {
- if (device_may_wakeup(&pdev->dev))
- disable_irq_wake(
- gpiod_to_irq(main_bat.charge_finished));
- else
- enable_irq(gpiod_to_irq(main_bat.charge_finished));
- }
-
- /* Schedule timer to check current status */
- schedule_delayed_work(&bat_work,
- msecs_to_jiffies(JITTER_DELAY));
-
- return 0;
-}
-#else
-#define s3c_adc_bat_suspend NULL
-#define s3c_adc_bat_resume NULL
-#endif
-
-static struct platform_driver s3c_adc_bat_driver = {
- .driver = {
- .name = "s3c-adc-battery",
- },
- .probe = s3c_adc_bat_probe,
- .remove = s3c_adc_bat_remove,
- .suspend = s3c_adc_bat_suspend,
- .resume = s3c_adc_bat_resume,
-};
-
-module_platform_driver(s3c_adc_bat_driver);
-
-MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");
-MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver");
-MODULE_LICENSE("GPL");
projects / platform / kernel / linux-rpi.git / commitdiff