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The LITMUS^RT kernel.

Bjoern Brandenburg

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path: root/arch/mips/ath79/dev-common.c

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Diffstat (limited to 'arch/mips/ath79/dev-common.c')

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arch/mips/ath79/dev-common.c

1 files changed, 2 insertions, 1 deletions


diff --git a/arch/mips/ath79/dev-common.c b/arch/mips/ath79/dev-common.c index f4956f809072..45efc63b08b6 100644 --- a/arch/mips/ath79/dev-common.c +++ b/arch/mips/ath79/dev-common.c
@@ -89,7 +89,8 @@ void __init ath79_register_uart(void)
89		89
90	if (soc_is_ar71xx() \|\|	90	if (soc_is_ar71xx() \|\|
91	soc_is_ar724x() \|\|	91	soc_is_ar724x() \|\|
92	soc_is_ar913x()) {	92	soc_is_ar913x() \|\|
		93	soc_is_ar934x()) {
93	ath79_uart_data[0].uartclk = clk_get_rate(clk);	94	ath79_uart_data[0].uartclk = clk_get_rate(clk);
94	platform_device_register(&ath79_uart_device);	95	platform_device_register(&ath79_uart_device);
95	} else if (soc_is_ar933x()) {	96	} else if (soc_is_ar933x()) {

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/*
 * Copyright (C) 2011 Samsung Electronics Co., Ltd.
 * MyungJoo Ham <myungjoo.ham@samsung.com>
 *
 * This driver enables to monitor battery health and control charger
 * during suspend-to-mem.
 * Charger manager depends on other devices. register this later than
 * the depending devices.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
**/

#include <linux/io.h>
#include <linux/module.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/rtc.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>
#include <linux/power/charger-manager.h>
#include <linux/regulator/consumer.h>

static const char * const default_event_names[] = {
	[CM_EVENT_UNKNOWN] = "Unknown",
	[CM_EVENT_BATT_FULL] = "Battery Full",
	[CM_EVENT_BATT_IN] = "Battery Inserted",
	[CM_EVENT_BATT_OUT] = "Battery Pulled Out",
	[CM_EVENT_EXT_PWR_IN_OUT] = "External Power Attach/Detach",
	[CM_EVENT_CHG_START_STOP] = "Charging Start/Stop",
	[CM_EVENT_OTHERS] = "Other battery events"
};

/*
 * Regard CM_JIFFIES_SMALL jiffies is small enough to ignore for
 * delayed works so that we can run delayed works with CM_JIFFIES_SMALL
 * without any delays.
 */
#define	CM_JIFFIES_SMALL	(2)

/* If y is valid (> 0) and smaller than x, do x = y */
#define CM_MIN_VALID(x, y)	x = (((y > 0) && ((x) > (y))) ? (y) : (x))

/*
 * Regard CM_RTC_SMALL (sec) is small enough to ignore error in invoking
 * rtc alarm. It should be 2 or larger
 */
#define CM_RTC_SMALL		(2)

#define UEVENT_BUF_SIZE		32

static LIST_HEAD(cm_list);
static DEFINE_MUTEX(cm_list_mtx);

/* About in-suspend (suspend-again) monitoring */
static struct rtc_device *rtc_dev;
/*
 * Backup RTC alarm
 * Save the wakeup alarm before entering suspend-to-RAM
 */
static struct rtc_wkalrm rtc_wkalarm_save;
/* Backup RTC alarm time in terms of seconds since 01-01-1970 00:00:00 */
static unsigned long rtc_wkalarm_save_time;
static bool cm_suspended;
static bool cm_rtc_set;
static unsigned long cm_suspend_duration_ms;

/* About normal (not suspended) monitoring */
static unsigned long polling_jiffy = ULONG_MAX; /* ULONG_MAX: no polling */
static unsigned long next_polling; /* Next appointed polling time */
static struct workqueue_struct *cm_wq; /* init at driver add */
static struct delayed_work cm_monitor_work; /* init at driver add */

/* Global charger-manager description */
static struct charger_global_desc *g_desc; /* init with setup_charger_manager */

/**
 * is_batt_present - See if the battery presents in place.
 * @cm: the Charger Manager representing the battery.
 */
static bool is_batt_present(struct charger_manager *cm)
{
	union power_supply_propval val;
	bool present = false;
	int i, ret;

	switch (cm->desc->battery_present) {
	case CM_BATTERY_PRESENT:
		present = true;
		break;
	case CM_NO_BATTERY:
		break;
	case CM_FUEL_GAUGE:
		ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
				POWER_SUPPLY_PROP_PRESENT, &val);
		if (ret == 0 && val.intval)
			present = true;
		break;
	case CM_CHARGER_STAT:
		for (i = 0; cm->charger_stat[i]; i++) {
			ret = cm->charger_stat[i]->get_property(
					cm->charger_stat[i],
					POWER_SUPPLY_PROP_PRESENT, &val);
			if (ret == 0 && val.intval) {
				present = true;
				break;
			}
		}
		break;
	}

	return present;
}

/**
 * is_ext_pwr_online - See if an external power source is attached to charge
 * @cm: the Charger Manager representing the battery.
 *
 * Returns true if at least one of the chargers of the battery has an external
 * power source attached to charge the battery regardless of whether it is
 * actually charging or not.
 */
static bool is_ext_pwr_online(struct charger_manager *cm)
{
	union power_supply_propval val;
	bool online = false;
	int i, ret;

	/* If at least one of them has one, it's yes. */
	for (i = 0; cm->charger_stat[i]; i++) {
		ret = cm->charger_stat[i]->get_property(
				cm->charger_stat[i],
				POWER_SUPPLY_PROP_ONLINE, &val);
		if (ret == 0 && val.intval) {
			online = true;
			break;
		}
	}

	return online;
}

/**
 * get_batt_uV - Get the voltage level of the battery
 * @cm: the Charger Manager representing the battery.
 * @uV: the voltage level returned.
 *
 * Returns 0 if there is no error.
 * Returns a negative value on error.
 */
static int get_batt_uV(struct charger_manager *cm, int *uV)
{
	union power_supply_propval val;
	int ret;

	if (!cm->fuel_gauge)
		return -ENODEV;

	ret = cm->fuel_gauge->get_property(cm->fuel_gauge,
				POWER_SUPPLY_PROP_VOLTAGE_NOW, &val);
	if (ret)
		return ret;

	*uV = val.intval;
	return 0;
}

/**
 * is_charging - Returns true if the battery is being charged.
 * @cm: the Charger Manager representing the battery.
 */
static bool is_charging(struct charger_manager *cm)
{
	int i, ret;
	bool charging = false;
	union power_supply_propval val;

	/* If there is no battery, it cannot be charged */
	if (!is_batt_present(cm))
		return false;

	/* If at least one of the charger is charging, return yes */
	for (i = 0; cm->charger_stat[i]; i++) {
		/* 1. The charger sholuld not be DISABLED */
		if (cm->emergency_stop)
			continue;
		if (!cm->charger_enabled)
			continue;

		/* 2. The charger should be online (ext-power) */
		ret = cm->charger_stat[i]->get_property(
				cm->charger_stat[i],
				POWER_SUPPLY_PROP_ONLINE, &val);
		if (ret) {
			dev_warn(cm->dev, "Cannot read ONLINE value from %s.\n",
					cm->desc->psy_charger_stat[i]);
			continue;
		}
		if (val.intval == 0)
			continue;

		/*
		 * 3. The charger should not be FULL, DISCHARGING,
		 * or NOT_CHARGING.
		 */
		ret = cm->charger_stat[i]->get_property(
				cm->charger_stat[i],
				POWER_SUPPLY_PROP_STATUS, &val);
		if (ret) {
			dev_warn(cm->dev, "Cannot read STATUS value from %s.\n",
					cm->desc->psy_charger_stat[i]);
			continue;
		}
		if (val.intval == POWER_SUPPLY_STATUS_FULL ||
				val.intval == POWER_SUPPLY_STATUS_DISCHARGING ||
				val.intval == POWER_SUPPLY_STATUS_NOT_CHARGING)
			continue;

		/* Then, this is charging. */
		charging = true;
		break;
	}

	return charging;
}

/**
 * is_polling_required - Return true if need to continue polling for this CM.
 * @cm: the Charger Manager representing the battery.
 */
static bool is_polling_required(struct charger_manager *cm)
{
	switch (cm->desc->polling_mode) {
	case CM_POLL_DISABLE:
		return false;
	case CM_POLL_ALWAYS:
		return true;
	case CM_POLL_EXTERNAL_POWER_ONLY:
		return is_ext_pwr_online(cm);
	case CM_POLL_CHARGING_ONLY:
		return is_charging(cm);
	default:
		dev_warn(cm->dev, "Incorrect polling_mode (%d)\n",
			cm->desc->polling_mode);
	}

	return false;
}

/**
 * try_charger_enable - Enable/Disable chargers altogether
 * @cm: the Charger Manager representing the battery.
 * @enable: true: enable / false: disable
 *
 * Note that Charger Manager keeps the charger enabled regardless whether
 * the charger is charging or not (because battery is full or no external
 * power source exists) except when CM needs to disable chargers forcibly
 * bacause of emergency causes; when the battery is overheated or too cold.
 */
static int try_charger_enable(struct charger_manager *cm, bool enable)
{
	int err = 0, i;
	struct charger_desc *desc = cm->desc;

	/* Ignore if it's redundent command */
	if (enable == cm->charger_enabled)
		return 0;

	if (enable) {
		if (cm->emergency_stop)
			return -EAGAIN;
		for (i = 0 ; i < desc->num_charger_regulators ; i++)
			regulator_enable(desc->charger_regulators[i].consumer);
	} else {
		/*
		 * Abnormal battery state - Stop charging forcibly,
		 * even if charger was enabled at the other places
		 */
		for (i = 0; i < desc->num_charger_regulators; i++) {
			if (regulator_is_enabled(
				    desc->charger_regulators[i].consumer)) {
				regulator_force_disable(
					desc->charger_regulators[i].consumer);
				dev_warn(cm->dev,
					"Disable regulator(%s) forcibly.\n",
					desc->charger_regulators[i].regulator_name);
			}
		}
	}

	if (!err)
		cm->charger_enabled = enable;

	return err;
}

/**
 * try_charger_restart - Restart charging.
 * @cm: the Charger Manager representing the battery.
 *
 * Restart charging by turning off and on the charger.
 */
static int try_charger_restart(struct charger_manager *cm)
{
	int err;

	if (cm->emergency_stop)
		return -EAGAIN;

	err = try_charger_enable(cm, false);
	if (err)
		return err;

	return try_charger_enable(cm, true);
}

/**
 * uevent_notify - Let users know something has changed.
 * @cm: the Charger Manager representing the battery.
 * @event: the event string.
 *
 * If @event is null, it implies that uevent_notify is called
 * by resume function. When called in the resume function, cm_suspended
 * should be already reset to false in order to let uevent_notify
 * notify the recent event during the suspend to users. While
 * suspended, uevent_notify does not notify users, but tracks
 * events so that uevent_notify can notify users later after resumed.
 */
static void uevent_notify(struct charger_manager *cm, const char *event)
{
	static char env_str[UEVENT_BUF_SIZE + 1] = "";
	static char env_str_save[UEVENT_BUF_SIZE + 1] = "";

	if (cm_suspended) {
		/* Nothing in suspended-event buffer */
		if (env_str_save[0] == 0) {
			if (!strncmp(env_str, event, UEVENT_BUF_SIZE))
				return; /* status not changed */
			strncpy(env_str_save, event, UEVENT_BUF_SIZE);
			return;
		}

		if (!strncmp(env_str_save, event, UEVENT_BUF_SIZE))
			return; /* Duplicated. */
		strncpy(env_str_save, event, UEVENT_BUF_SIZE);
		return;
	}

	if (event == NULL) {
		/* No messages pending */
		if (!env_str_save[0])
			return;

		strncpy(env_str, env_str_save, UEVENT_BUF_SIZE);
		kobject_uevent(&cm->dev->kobj, KOBJ_CHANGE);
		env_str_save[0] = 0;

		return;
	}

	/* status not changed */
	if (!strncmp(env_str, event, UEVENT_BUF_SIZE))
		return;

	/* save the status and notify the update */
	strncpy(env_str, event, UEVENT_BUF_SIZE);
	kobject_uevent(&cm->dev->kobj, KOBJ_CHANGE);

	dev_info(cm->dev, event);
}

/**
 * fullbatt_vchk - Check voltage drop some times after "FULL" event.
 * @work: the work_struct appointing the function
 *
 * If a user has designated "fullbatt_vchkdrop_ms/uV" values with
 * charger_desc, Charger Manager checks voltage drop after the battery
 * "FULL" event. It checks whether the voltage has dropped more than
 * fullbatt_vchkdrop_uV by calling this function after fullbatt_vchkrop_ms.
 */
static void fullbatt_vchk(struct work_struct *work)
{
	struct delayed_work *dwork = to_delayed_work(work);
	struct charger_manager *cm = container_of(dwork,
			struct charger_manager, fullbatt_vchk_work);
	struct charger_desc *desc = cm->desc;
	int batt_uV, err, diff;

	/* remove the appointment for fullbatt_vchk */
	cm->fullbatt_vchk_jiffies_at = 0;

	if (!desc->fullbatt_vchkdrop_uV || !desc->fullbatt_vchkdrop_ms)
		return;

	err = get_batt_uV(cm, &batt_uV);
	if (err) {
		dev_err(cm->dev, "%s: get_batt_uV error(%d).\n", __func__, err);
		return;
	}

	diff = cm->fullbatt_vchk_uV;
	diff -= batt_uV;

	dev_dbg(cm->dev, "VBATT dropped %duV after full-batt.\n", diff);

	if (diff > desc->fullbatt_vchkdrop_uV) {
		try_charger_restart(cm);
		uevent_notify(cm, "Recharge");
	}
}

/**
 * _cm_monitor - Monitor the temperature and return true for exceptions.
 * @cm: the Charger Manager representing the battery.
 *
 * Returns true if there is an event to notify for the battery.
 * (True if the status of "emergency_stop" changes)
 */
static bool _cm_monitor(struct charger_manager *cm)
{
	struct charger_desc *desc = cm->desc;
	int temp = desc->temperature_out_of_range(&cm->last_temp_mC);

	dev_dbg(cm->dev, "monitoring (%2.2d.%3.3dC)\n",
		cm->last_temp_mC / 1000, cm->last_temp_mC % 1000);

	/* It has been stopped or charging already */
	if (!!temp == !!cm->emergency_stop)
		return false;

	if (temp) {
		cm->emergency_stop = temp;
		if (!try_charger_enable(cm, false)) {
			if (temp > 0)
				uevent_notify(cm, "OVERHEAT");
			else
				uevent_notify(cm, "COLD");
		}
	} else {
		cm->emergency_stop = 0;
		if (!try_charger_enable(cm, true))
			uevent_notify(cm, "CHARGING");
	}

	return true;
}

/**
 * cm_monitor - Monitor every battery.
 *
 * Returns true if there is an event to notify from any of the batteries.
 * (True if the status of "emergency_stop" changes)
 */
static bool cm_monitor(void)
{
	bool stop = false;
	struct charger_manager *cm;

	mutex_lock(&cm_list_mtx);

	list_for_each_entry(cm, &cm_list, entry) {
		if (_cm_monitor(cm))
			stop = true;
	}

	mutex_unlock(&cm_list_mtx);

	return stop;
}

/**
 * _setup_polling - Setup the next instance of polling.
 * @work: work_struct of the function _setup_polling.
 */
static void _setup_polling(struct work_struct *work)
{
	unsigned long min = ULONG_MAX;
	struct charger_manager *cm;
	bool keep_polling = false;
	unsigned long _next_polling;

	mutex_lock(&cm_list_mtx);

	list_for_each_entry(cm, &cm_list, entry) {
		if (is_polling_required(cm) && cm->desc->polling_interval_ms) {
			keep_polling = true;

			if (min > cm->desc->polling_interval_ms)
				min = cm->desc->polling_interval_ms;
		}
	}

	polling_jiffy = msecs_to_jiffies(min);
	if (polling_jiffy <= CM_JIFFIES_SMALL)
		polling_jiffy = CM_JIFFIES_SMALL + 1;

	if (!keep_polling)
		polling_jiffy = ULONG_MAX;
	if (polling_jiffy == ULONG_MAX)
		goto out;


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