+++ /dev/null
-/*
- * android_battery.c
- * Android Battery Driver
- *
- * Copyright (C) 2012 Google, Inc.
- * Copyright (C) 2012 Samsung Electronics
- *
- * Based on work by himihee.seo@samsung.com, ms925.kim@samsung.com, and
- * joshua.chang@samsung.com.
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
-
-#include <linux/types.h>
-#include <linux/module.h>
-#include <linux/delay.h>
-#include <linux/err.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/jiffies.h>
-#include <linux/platform_device.h>
-#include <linux/power_supply.h>
-#include <linux/slab.h>
-#include <linux/wakelock.h>
-#include <linux/workqueue.h>
-#include <linux/alarmtimer.h>
-#include <linux/timer.h>
-#include <linux/mutex.h>
-#include <linux/debugfs.h>
-#include <linux/platform_data/android_battery.h>
-
-#define FAST_POLL (1 * 60)
-#define SLOW_POLL (10 * 60)
-
-struct android_bat_data {
- struct android_bat_platform_data *pdata;
- struct android_bat_callbacks callbacks;
-
- struct device *dev;
-
- struct power_supply psy_bat;
-
- struct wake_lock monitor_wake_lock;
- struct wake_lock charger_wake_lock;
-
- int charge_source;
-
- int batt_temp;
- int batt_current;
- unsigned int batt_health;
- unsigned int batt_vcell;
- unsigned int batt_soc;
- unsigned int charging_status;
- bool recharging;
- unsigned long charging_start_time;
-
- struct workqueue_struct *monitor_wqueue;
- struct work_struct monitor_work;
- struct work_struct charger_work;
-
- struct alarm monitor_alarm;
- ktime_t last_poll;
-
- struct dentry *debugfs_entry;
-};
-
-static enum power_supply_property android_battery_props[] = {
- POWER_SUPPLY_PROP_STATUS,
- POWER_SUPPLY_PROP_HEALTH,
- POWER_SUPPLY_PROP_PRESENT,
- POWER_SUPPLY_PROP_TEMP,
- POWER_SUPPLY_PROP_ONLINE,
- POWER_SUPPLY_PROP_VOLTAGE_NOW,
- POWER_SUPPLY_PROP_CAPACITY,
- POWER_SUPPLY_PROP_TECHNOLOGY,
- POWER_SUPPLY_PROP_CURRENT_NOW,
-};
-
-static DEFINE_MUTEX(android_bat_state_lock);
-
-static void android_bat_update_data(struct android_bat_data *battery);
-static int android_bat_enable_charging(struct android_bat_data *battery,
- bool enable);
-
-static char *charge_source_str(int charge_source)
-{
- switch (charge_source) {
- case CHARGE_SOURCE_NONE:
- return "none";
- case CHARGE_SOURCE_AC:
- return "ac";
- case CHARGE_SOURCE_USB:
- return "usb";
- default:
- break;
- }
-
- return "?";
-}
-
-static int android_bat_get_property(struct power_supply *ps,
- enum power_supply_property psp,
- union power_supply_propval *val)
-{
- struct android_bat_data *battery =
- container_of(ps, struct android_bat_data, psy_bat);
-
- switch (psp) {
- case POWER_SUPPLY_PROP_STATUS:
- val->intval = battery->charging_status;
- break;
- case POWER_SUPPLY_PROP_HEALTH:
- val->intval = battery->batt_health;
- break;
- case POWER_SUPPLY_PROP_PRESENT:
- val->intval = 1;
- break;
- case POWER_SUPPLY_PROP_TEMP:
- val->intval = battery->batt_temp;
- break;
- case POWER_SUPPLY_PROP_ONLINE:
- val->intval = 1;
- break;
- case POWER_SUPPLY_PROP_VOLTAGE_NOW:
- android_bat_update_data(battery);
- val->intval = battery->batt_vcell;
- if (val->intval == -1)
- return -EINVAL;
- break;
- case POWER_SUPPLY_PROP_CAPACITY:
- val->intval = battery->batt_soc;
- if (val->intval == -1)
- return -EINVAL;
- break;
- case POWER_SUPPLY_PROP_TECHNOLOGY:
- val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
- break;
- case POWER_SUPPLY_PROP_CURRENT_NOW:
- android_bat_update_data(battery);
- val->intval = battery->batt_current;
- break;
- default:
- return -EINVAL;
- }
- return 0;
-}
-
-static void android_bat_get_temp(struct android_bat_data *battery)
-{
- int batt_temp = 42; /* 4.2C */
- int health = battery->batt_health;
-
- if (battery->pdata->get_temperature)
- battery->pdata->get_temperature(&batt_temp);
-
- if (battery->charge_source != CHARGE_SOURCE_NONE) {
- if (batt_temp >= battery->pdata->temp_high_threshold) {
- if (health != POWER_SUPPLY_HEALTH_OVERHEAT &&
- health != POWER_SUPPLY_HEALTH_UNSPEC_FAILURE) {
- pr_info("battery overheat (%d>=%d), " \
- "charging unavailable\n",
- batt_temp,
- battery->pdata->temp_high_threshold);
- battery->batt_health =
- POWER_SUPPLY_HEALTH_OVERHEAT;
- }
- } else if (batt_temp <= battery->pdata->temp_high_recovery &&
- batt_temp >= battery->pdata->temp_low_recovery) {
- if (health == POWER_SUPPLY_HEALTH_OVERHEAT ||
- health == POWER_SUPPLY_HEALTH_COLD) {
- pr_info("battery recovery (%d,%d~%d)," \
- "charging available\n",
- batt_temp,
- battery->pdata->temp_low_recovery,
- battery->pdata->temp_high_recovery);
- battery->batt_health =
- POWER_SUPPLY_HEALTH_GOOD;
- }
- } else if (batt_temp <= battery->pdata->temp_low_threshold) {
- if (health != POWER_SUPPLY_HEALTH_COLD &&
- health != POWER_SUPPLY_HEALTH_UNSPEC_FAILURE) {
- pr_info("battery cold (%d <= %d)," \
- "charging unavailable\n",
- batt_temp,
- battery->pdata->temp_low_threshold);
- battery->batt_health =
- POWER_SUPPLY_HEALTH_COLD;
- }
- }
- }
-
- battery->batt_temp = batt_temp;
-}
-
-/*
- * android_bat_state_lock not held, may call back into
- * android_bat_charge_source_changed. Gathering data here can be
- * non-atomic; updating our state based on the data may need to be
- * atomic.
- */
-
-static void android_bat_update_data(struct android_bat_data *battery)
-{
- int ret;
- int v;
-
- if (battery->pdata->poll_charge_source)
- battery->charge_source = battery->pdata->poll_charge_source();
-
- if (battery->pdata->get_voltage_now) {
- ret = battery->pdata->get_voltage_now();
- battery->batt_vcell = ret >= 0 ? ret : 4242000;
- }
-
- if (battery->pdata->get_capacity) {
- ret = battery->pdata->get_capacity();
- battery->batt_soc = ret >= 0 ? ret : 42;
- }
-
- if (battery->pdata->get_current_now) {
- ret = battery->pdata->get_current_now(&v);
-
- if (!ret)
- battery->batt_current = v;
- }
-
- android_bat_get_temp(battery);
-}
-
-static void android_bat_set_charge_time(struct android_bat_data *battery,
- bool enable)
-{
- if (enable && !battery->charging_start_time) {
- struct timespec cur_time;
-
- get_monotonic_boottime(&cur_time);
- /* record start time for charge timeout timer */
- battery->charging_start_time = cur_time.tv_sec;
- } else if (!enable) {
- /* clear charge timeout timer */
- battery->charging_start_time = 0;
- }
-}
-
-static int android_bat_enable_charging(struct android_bat_data *battery,
- bool enable)
-{
- if (enable && (battery->batt_health != POWER_SUPPLY_HEALTH_GOOD)) {
- battery->charging_status =
- POWER_SUPPLY_STATUS_NOT_CHARGING;
- return -EPERM;
- }
-
- if (enable) {
- if (battery->pdata && battery->pdata->set_charging_current)
- battery->pdata->set_charging_current
- (battery->charge_source);
- }
-
- if (battery->pdata && battery->pdata->set_charging_enable)
- battery->pdata->set_charging_enable(enable);
-
- android_bat_set_charge_time(battery, enable);
- pr_info("battery: enable=%d charger: %s\n", enable,
- charge_source_str(battery->charge_source));
- return 0;
-}
-
-static bool android_bat_charge_timeout(struct android_bat_data *battery,
- unsigned long timeout)
-{
- struct timespec cur_time;
-
- if (!battery->charging_start_time)
- return 0;
-
- get_monotonic_boottime(&cur_time);
- pr_debug("%s: Start time: %ld, End time: %ld, current time: %ld\n",
- __func__, battery->charging_start_time,
- battery->charging_start_time + timeout,
- cur_time.tv_sec);
- return cur_time.tv_sec >= battery->charging_start_time + timeout;
-}
-
-static void android_bat_charging_timer(struct android_bat_data *battery)
-{
- if (!battery->charging_start_time &&
- battery->charging_status == POWER_SUPPLY_STATUS_CHARGING) {
- android_bat_enable_charging(battery, true);
- battery->recharging = true;
- pr_debug("%s: charge status charging but timer is expired\n",
- __func__);
- } else if (battery->charging_start_time == 0) {
- pr_debug("%s: charging_start_time never initialized\n",
- __func__);
- return;
- }
-
- if (android_bat_charge_timeout(
- battery,
- battery->recharging ? battery->pdata->recharging_time :
- battery->pdata->full_charging_time)) {
- android_bat_enable_charging(battery, false);
- if (battery->batt_vcell >
- battery->pdata->recharging_voltage &&
- battery->batt_soc == 100)
- battery->charging_status =
- POWER_SUPPLY_STATUS_FULL;
- battery->recharging = false;
- battery->charging_start_time = 0;
- pr_info("battery: charging timer expired\n");
- }
-
- return;
-}
-
-static void android_bat_charge_source_changed(struct android_bat_callbacks *ptr,
- int charge_source)
-{
- struct android_bat_data *battery =
- container_of(ptr, struct android_bat_data, callbacks);
-
- wake_lock(&battery->charger_wake_lock);
- mutex_lock(&android_bat_state_lock);
- battery->charge_source = charge_source;
-
- pr_info("battery: charge source type was changed: %s\n",
- charge_source_str(battery->charge_source));
-
- mutex_unlock(&android_bat_state_lock);
- queue_work(battery->monitor_wqueue, &battery->charger_work);
-}
-
-static void android_bat_set_full_status(struct android_bat_callbacks *ptr)
-{
- struct android_bat_data *battery =
- container_of(ptr, struct android_bat_data, callbacks);
-
- mutex_lock(&android_bat_state_lock);
- pr_info("battery: battery full\n");
- battery->charging_status = POWER_SUPPLY_STATUS_FULL;
- android_bat_enable_charging(battery, false);
- battery->recharging = false;
- mutex_unlock(&android_bat_state_lock);
- power_supply_changed(&battery->psy_bat);
-}
-
-static void android_bat_charger_work(struct work_struct *work)
-{
- struct android_bat_data *battery =
- container_of(work, struct android_bat_data, charger_work);
-
- mutex_lock(&android_bat_state_lock);
-
- switch (battery->charge_source) {
- case CHARGE_SOURCE_NONE:
- battery->charging_status = POWER_SUPPLY_STATUS_DISCHARGING;
- android_bat_enable_charging(battery, false);
- battery->batt_health = POWER_SUPPLY_HEALTH_GOOD;
- battery->recharging = false;
- battery->charging_start_time = 0;
- break;
- case CHARGE_SOURCE_USB:
- case CHARGE_SOURCE_AC:
- /*
- * If charging status indicates a charger was already
- * connected prior to this and the status is something
- * other than charging ("full" or "not-charging"), leave
- * the status alone.
- */
- if (battery->charging_status ==
- POWER_SUPPLY_STATUS_DISCHARGING ||
- battery->charging_status == POWER_SUPPLY_STATUS_UNKNOWN)
- battery->charging_status = POWER_SUPPLY_STATUS_CHARGING;
-
- /*
- * Don't re-enable charging if the battery is full and we
- * are not actively re-charging it, or if "not-charging"
- * status is set.
- */
- if (!((battery->charging_status == POWER_SUPPLY_STATUS_FULL
- && !battery->recharging) || battery->charging_status ==
- POWER_SUPPLY_STATUS_NOT_CHARGING))
- android_bat_enable_charging(battery, true);
-
- break;
- default:
- pr_err("%s: Invalid charger type\n", __func__);
- break;
- }
-
- mutex_unlock(&android_bat_state_lock);
- wake_lock_timeout(&battery->charger_wake_lock, HZ * 2);
- power_supply_changed(&battery->psy_bat);
-}
-
-
-static void android_bat_monitor_set_alarm(struct android_bat_data *battery,
- int seconds)
-{
- alarm_start(&battery->monitor_alarm,
- ktime_add(battery->last_poll, ktime_set(seconds, 0)));
-}
-
-static void android_bat_monitor_work(struct work_struct *work)
-{
- struct android_bat_data *battery =
- container_of(work, struct android_bat_data, monitor_work);
- struct timespec cur_time;
-
- wake_lock(&battery->monitor_wake_lock);
- android_bat_update_data(battery);
- mutex_lock(&android_bat_state_lock);
-
- switch (battery->charging_status) {
- case POWER_SUPPLY_STATUS_FULL:
- if (battery->batt_vcell < battery->pdata->recharging_voltage &&
- !battery->recharging) {
- battery->recharging = true;
- android_bat_enable_charging(battery, true);
- pr_info("battery: start recharging, v=%d\n",
- battery->batt_vcell/1000);
- }
- break;
- case POWER_SUPPLY_STATUS_DISCHARGING:
- break;
- case POWER_SUPPLY_STATUS_CHARGING:
- switch (battery->batt_health) {
- case POWER_SUPPLY_HEALTH_OVERHEAT:
- case POWER_SUPPLY_HEALTH_COLD:
- case POWER_SUPPLY_HEALTH_OVERVOLTAGE:
- case POWER_SUPPLY_HEALTH_DEAD:
- case POWER_SUPPLY_HEALTH_UNSPEC_FAILURE:
- battery->charging_status =
- POWER_SUPPLY_STATUS_NOT_CHARGING;
- android_bat_enable_charging(battery, false);
-
- pr_info("battery: Not charging, health=%d\n",
- battery->batt_health);
- break;
- default:
- break;
- }
- break;
- case POWER_SUPPLY_STATUS_NOT_CHARGING:
- if (battery->batt_health == POWER_SUPPLY_HEALTH_GOOD) {
- pr_info("battery: battery health recovered\n");
- if (battery->charge_source != CHARGE_SOURCE_NONE) {
- android_bat_enable_charging(battery, true);
- battery->charging_status
- = POWER_SUPPLY_STATUS_CHARGING;
- } else {
- battery->charging_status
- = POWER_SUPPLY_STATUS_DISCHARGING;
- }
- }
- break;
- default:
- pr_err("%s: Undefined battery status: %d\n", __func__,
- battery->charging_status);
- break;
- }
-
- android_bat_charging_timer(battery);
- get_monotonic_boottime(&cur_time);
- pr_info("battery: l=%d v=%d c=%d temp=%s%ld.%ld h=%d st=%d%s ct=%lu type=%s\n",
- battery->batt_soc, battery->batt_vcell/1000,
- battery->batt_current, battery->batt_temp < 0 ? "-" : "",
- abs(battery->batt_temp / 10), abs(battery->batt_temp % 10),
- battery->batt_health, battery->charging_status,
- battery->recharging ? "r" : "",
- battery->charging_start_time ?
- cur_time.tv_sec - battery->charging_start_time : 0,
- charge_source_str(battery->charge_source));
- mutex_unlock(&android_bat_state_lock);
- power_supply_changed(&battery->psy_bat);
- battery->last_poll = ktime_get_boottime();
- android_bat_monitor_set_alarm(battery, FAST_POLL);
- wake_unlock(&battery->monitor_wake_lock);
- return;
-}
-
-static enum alarmtimer_restart android_bat_monitor_alarm(
- struct alarm *alarm, ktime_t now)
-{
- struct android_bat_data *battery =
- container_of(alarm, struct android_bat_data, monitor_alarm);
-
- wake_lock(&battery->monitor_wake_lock);
- queue_work(battery->monitor_wqueue, &battery->monitor_work);
- return ALARMTIMER_NORESTART;
-}
-
-static int android_power_debug_dump(struct seq_file *s, void *unused)
-{
- struct android_bat_data *battery = s->private;
- struct timespec cur_time;
-
- android_bat_update_data(battery);
- get_monotonic_boottime(&cur_time);
- mutex_lock(&android_bat_state_lock);
- seq_printf(s, "l=%d v=%d c=%d temp=%s%ld.%ld h=%d st=%d%s ct=%lu type=%s\n",
- battery->batt_soc, battery->batt_vcell/1000,
- battery->batt_current, battery->batt_temp < 0 ? "-" : "",
- abs(battery->batt_temp / 10), abs(battery->batt_temp % 10),
- battery->batt_health, battery->charging_status,
- battery->recharging ? "r" : "",
- battery->charging_start_time ?
- cur_time.tv_sec - battery->charging_start_time : 0,
- charge_source_str(battery->charge_source));
- mutex_unlock(&android_bat_state_lock);
- return 0;
-}
-
-static int android_power_debug_open(struct inode *inode, struct file *file)
-{
- return single_open(file, android_power_debug_dump, inode->i_private);
-}
-
-static const struct file_operations android_power_debug_fops = {
- .open = android_power_debug_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
-static int android_bat_probe(struct platform_device *pdev)
-{
- struct android_bat_platform_data *pdata = dev_get_platdata(&pdev->dev);
- struct android_bat_data *battery;
- int ret = 0;
-
- dev_info(&pdev->dev, "Android Battery Driver\n");
- battery = kzalloc(sizeof(*battery), GFP_KERNEL);
- if (!battery)
- return -ENOMEM;
-
- battery->pdata = pdata;
- if (!battery->pdata) {
- pr_err("%s : No platform data\n", __func__);
- ret = -EINVAL;
- goto err_pdata;
- }
-
- battery->dev = &pdev->dev;
- platform_set_drvdata(pdev, battery);
- battery->batt_health = POWER_SUPPLY_HEALTH_GOOD;
-
- battery->psy_bat.name = "android-battery",
- battery->psy_bat.type = POWER_SUPPLY_TYPE_BATTERY,
- battery->psy_bat.properties = android_battery_props,
- battery->psy_bat.num_properties = ARRAY_SIZE(android_battery_props),
- battery->psy_bat.get_property = android_bat_get_property,
-
- battery->batt_vcell = -1;
- battery->batt_soc = -1;
-
- wake_lock_init(&battery->monitor_wake_lock, WAKE_LOCK_SUSPEND,
- "android-battery-monitor");
- wake_lock_init(&battery->charger_wake_lock, WAKE_LOCK_SUSPEND,
- "android-chargerdetect");
-
- ret = power_supply_register(&pdev->dev, &battery->psy_bat);
- if (ret) {
- dev_err(battery->dev, "%s: failed to register psy_bat\n",
- __func__);
- goto err_psy_bat_reg;
- }
-
- battery->monitor_wqueue =
- alloc_workqueue(dev_name(&pdev->dev), WQ_FREEZABLE, 1);
- if (!battery->monitor_wqueue) {
- dev_err(battery->dev, "%s: fail to create workqueue\n",
- __func__);
- goto err_wq;
- }
-
- INIT_WORK(&battery->monitor_work, android_bat_monitor_work);
- INIT_WORK(&battery->charger_work, android_bat_charger_work);
-
- battery->callbacks.charge_source_changed =
- android_bat_charge_source_changed;
- battery->callbacks.battery_set_full =
- android_bat_set_full_status;
- if (battery->pdata && battery->pdata->register_callbacks)
- battery->pdata->register_callbacks(&battery->callbacks);
-
- /* get initial charger status */
- if (battery->pdata->poll_charge_source)
- battery->charge_source = battery->pdata->poll_charge_source();
-
- wake_lock(&battery->charger_wake_lock);
- queue_work(battery->monitor_wqueue, &battery->charger_work);
-
- wake_lock(&battery->monitor_wake_lock);
- battery->last_poll = ktime_get_boottime();
- alarm_init(&battery->monitor_alarm, ALARM_BOOTTIME,
- android_bat_monitor_alarm);
- queue_work(battery->monitor_wqueue, &battery->monitor_work);
-
- battery->debugfs_entry =
- debugfs_create_file("android-power", S_IRUGO, NULL,
- battery, &android_power_debug_fops);
- if (!battery->debugfs_entry)
- pr_err("failed to create android-power debugfs entry\n");
-
- return 0;
-
-err_wq:
- power_supply_unregister(&battery->psy_bat);
-err_psy_bat_reg:
- wake_lock_destroy(&battery->monitor_wake_lock);
- wake_lock_destroy(&battery->charger_wake_lock);
-err_pdata:
- kfree(battery);
-
- return ret;
-}
-
-static int android_bat_remove(struct platform_device *pdev)
-{
- struct android_bat_data *battery = platform_get_drvdata(pdev);
-
- alarm_cancel(&battery->monitor_alarm);
- flush_workqueue(battery->monitor_wqueue);
- destroy_workqueue(battery->monitor_wqueue);
- power_supply_unregister(&battery->psy_bat);
- wake_lock_destroy(&battery->monitor_wake_lock);
- wake_lock_destroy(&battery->charger_wake_lock);
- debugfs_remove(battery->debugfs_entry);
- kfree(battery);
- return 0;
-}
-
-static int android_bat_suspend(struct device *dev)
-{
- struct android_bat_data *battery = dev_get_drvdata(dev);
-
- cancel_work_sync(&battery->monitor_work);
- android_bat_monitor_set_alarm(
- battery,
- battery->charge_source == CHARGE_SOURCE_NONE ?
- SLOW_POLL : FAST_POLL);
- return 0;
-}
-
-static void android_bat_resume(struct device *dev)
-{
- struct android_bat_data *battery = dev_get_drvdata(dev);
-
- android_bat_monitor_set_alarm(battery, FAST_POLL);
- return;
-}
-
-static const struct dev_pm_ops android_bat_pm_ops = {
- .prepare = android_bat_suspend,
- .complete = android_bat_resume,
-};
-
-static struct platform_driver android_bat_driver = {
- .driver = {
- .name = "android-battery",
- .owner = THIS_MODULE,
- .pm = &android_bat_pm_ops,
- },
- .probe = android_bat_probe,
- .remove = android_bat_remove,
-};
-
-static int __init android_bat_init(void)
-{
- return platform_driver_register(&android_bat_driver);
-}
-
-static void __exit android_bat_exit(void)
-{
- platform_driver_unregister(&android_bat_driver);
-}
-
-late_initcall(android_bat_init);
-module_exit(android_bat_exit);
-
-MODULE_DESCRIPTION("Android battery driver");
-MODULE_LICENSE("GPL");
projects / sojka / nv-tegra / linux-3.10.git / commitdiff