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linux-next/drivers/power/tosa_battery.c
Tejun Heo 43829731dd workqueue: deprecate flush[_delayed]_work_sync() 
flush[_delayed]_work_sync() are now spurious.  Mark them deprecated
and convert all users to flush[_delayed]_work().

If you're cc'd and wondering what's going on: Now all workqueues are
non-reentrant and the regular flushes guarantee that the work item is
not pending or running on any CPU on return, so there's no reason to
use the sync flushes at all and they're going away.

This patch doesn't make any functional difference.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Mattia Dongili <malattia@linux.it>
Cc: Kent Yoder <key@linux.vnet.ibm.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Karsten Keil <isdn@linux-pingi.de>
Cc: Bryan Wu <bryan.wu@canonical.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Alasdair Kergon <agk@redhat.com>
Cc: Mauro Carvalho Chehab <mchehab@infradead.org>
Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: linux-wireless@vger.kernel.org
Cc: Anton Vorontsov <cbou@mail.ru>
Cc: Sangbeom Kim <sbkim73@samsung.com>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Petr Vandrovec <petr@vandrovec.name>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Avi Kivity <avi@redhat.com>
2012-08-20 14:51:24 -07:00

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/*
* Battery and Power Management code for the Sharp SL-6000x
*
* Copyright (c) 2005 Dirk Opfer
* Copyright (c) 2008 Dmitry Baryshkov
*
* 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/kernel.h>
#include <linux/module.h>
#include <linux/power_supply.h>
#include <linux/wm97xx.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <asm/mach-types.h>
#include <mach/tosa.h>
static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
static struct work_struct bat_work;
struct tosa_bat {
int status;
struct power_supply psy;
int full_chrg;
struct mutex work_lock; /* protects data */
bool (*is_present)(struct tosa_bat *bat);
int gpio_full;
int gpio_charge_off;
int technology;
int gpio_bat;
int adc_bat;
int adc_bat_divider;
int bat_max;
int bat_min;
int gpio_temp;
int adc_temp;
int adc_temp_divider;
};
static struct tosa_bat tosa_bat_main;
static struct tosa_bat tosa_bat_jacket;
static unsigned long tosa_read_bat(struct tosa_bat *bat)
{
unsigned long value = 0;
if (bat->gpio_bat < 0 || bat->adc_bat < 0)
return 0;
mutex_lock(&bat_lock);
gpio_set_value(bat->gpio_bat, 1);
msleep(5);
value = wm97xx_read_aux_adc(dev_get_drvdata(bat->psy.dev->parent),
bat->adc_bat);
gpio_set_value(bat->gpio_bat, 0);
mutex_unlock(&bat_lock);
value = value * 1000000 / bat->adc_bat_divider;
return value;
}
static unsigned long tosa_read_temp(struct tosa_bat *bat)
{
unsigned long value = 0;
if (bat->gpio_temp < 0 || bat->adc_temp < 0)
return 0;
mutex_lock(&bat_lock);
gpio_set_value(bat->gpio_temp, 1);
msleep(5);
value = wm97xx_read_aux_adc(dev_get_drvdata(bat->psy.dev->parent),
bat->adc_temp);
gpio_set_value(bat->gpio_temp, 0);
mutex_unlock(&bat_lock);
value = value * 10000 / bat->adc_temp_divider;
return value;
}
static int tosa_bat_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
int ret = 0;
struct tosa_bat *bat = container_of(psy, struct tosa_bat, psy);
if (bat->is_present && !bat->is_present(bat)
&& psp != POWER_SUPPLY_PROP_PRESENT) {
return -ENODEV;
}
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
val->intval = bat->status;
break;
case POWER_SUPPLY_PROP_TECHNOLOGY:
val->intval = bat->technology;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
val->intval = tosa_read_bat(bat);
break;
case POWER_SUPPLY_PROP_VOLTAGE_MAX:
if (bat->full_chrg == -1)
val->intval = bat->bat_max;
else
val->intval = bat->full_chrg;
break;
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
val->intval = bat->bat_max;
break;
case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
val->intval = bat->bat_min;
break;
case POWER_SUPPLY_PROP_TEMP:
val->intval = tosa_read_temp(bat);
break;
case POWER_SUPPLY_PROP_PRESENT:
val->intval = bat->is_present ? bat->is_present(bat) : 1;
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static bool tosa_jacket_bat_is_present(struct tosa_bat *bat)
{
return gpio_get_value(TOSA_GPIO_JACKET_DETECT) == 0;
}
static void tosa_bat_external_power_changed(struct power_supply *psy)
{
schedule_work(&bat_work);
}
static irqreturn_t tosa_bat_gpio_isr(int irq, void *data)
{
pr_info("tosa_bat_gpio irq: %d\n", gpio_get_value(irq_to_gpio(irq)));
schedule_work(&bat_work);
return IRQ_HANDLED;
}
static void tosa_bat_update(struct tosa_bat *bat)
{
int old;
struct power_supply *psy = &bat->psy;
mutex_lock(&bat->work_lock);
old = bat->status;
if (bat->is_present && !bat->is_present(bat)) {
printk(KERN_NOTICE "%s not present\n", psy->name);
bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
bat->full_chrg = -1;
} else if (power_supply_am_i_supplied(psy)) {
if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) {
gpio_set_value(bat->gpio_charge_off, 0);
mdelay(15);
}
if (gpio_get_value(bat->gpio_full)) {
if (old == POWER_SUPPLY_STATUS_CHARGING ||
bat->full_chrg == -1)
bat->full_chrg = tosa_read_bat(bat);
gpio_set_value(bat->gpio_charge_off, 1);
bat->status = POWER_SUPPLY_STATUS_FULL;
} else {
gpio_set_value(bat->gpio_charge_off, 0);
bat->status = POWER_SUPPLY_STATUS_CHARGING;
}
} else {
gpio_set_value(bat->gpio_charge_off, 1);
bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
}
if (old != bat->status)
power_supply_changed(psy);
mutex_unlock(&bat->work_lock);
}
static void tosa_bat_work(struct work_struct *work)
{
tosa_bat_update(&tosa_bat_main);
tosa_bat_update(&tosa_bat_jacket);
}
static enum power_supply_property tosa_bat_main_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_VOLTAGE_MAX,
POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
POWER_SUPPLY_PROP_TEMP,
POWER_SUPPLY_PROP_PRESENT,
};
static enum power_supply_property tosa_bat_bu_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
POWER_SUPPLY_PROP_PRESENT,
};
static struct tosa_bat tosa_bat_main = {
.status = POWER_SUPPLY_STATUS_DISCHARGING,
.full_chrg = -1,
.psy = {
.name = "main-battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = tosa_bat_main_props,
.num_properties = ARRAY_SIZE(tosa_bat_main_props),
.get_property = tosa_bat_get_property,
.external_power_changed = tosa_bat_external_power_changed,
.use_for_apm = 1,
},
.gpio_full = TOSA_GPIO_BAT0_CRG,
.gpio_charge_off = TOSA_GPIO_CHARGE_OFF,
.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
.gpio_bat = TOSA_GPIO_BAT0_V_ON,
.adc_bat = WM97XX_AUX_ID3,
.adc_bat_divider = 414,
.bat_max = 4310000,
.bat_min = 1551 * 1000000 / 414,
.gpio_temp = TOSA_GPIO_BAT1_TH_ON,
.adc_temp = WM97XX_AUX_ID2,
.adc_temp_divider = 10000,
};
static struct tosa_bat tosa_bat_jacket = {
.status = POWER_SUPPLY_STATUS_DISCHARGING,
.full_chrg = -1,
.psy = {
.name = "jacket-battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = tosa_bat_main_props,
.num_properties = ARRAY_SIZE(tosa_bat_main_props),
.get_property = tosa_bat_get_property,
.external_power_changed = tosa_bat_external_power_changed,
},
.is_present = tosa_jacket_bat_is_present,
.gpio_full = TOSA_GPIO_BAT1_CRG,
.gpio_charge_off = TOSA_GPIO_CHARGE_OFF_JC,
.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
.gpio_bat = TOSA_GPIO_BAT1_V_ON,
.adc_bat = WM97XX_AUX_ID3,
.adc_bat_divider = 414,
.bat_max = 4310000,
.bat_min = 1551 * 1000000 / 414,
.gpio_temp = TOSA_GPIO_BAT0_TH_ON,
.adc_temp = WM97XX_AUX_ID2,
.adc_temp_divider = 10000,
};
static struct tosa_bat tosa_bat_bu = {
.status = POWER_SUPPLY_STATUS_UNKNOWN,
.full_chrg = -1,
.psy = {
.name = "backup-battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = tosa_bat_bu_props,
.num_properties = ARRAY_SIZE(tosa_bat_bu_props),
.get_property = tosa_bat_get_property,
.external_power_changed = tosa_bat_external_power_changed,
},
.gpio_full = -1,
.gpio_charge_off = -1,
.technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
.gpio_bat = TOSA_GPIO_BU_CHRG_ON,
.adc_bat = WM97XX_AUX_ID4,
.adc_bat_divider = 1266,
.gpio_temp = -1,
.adc_temp = -1,
.adc_temp_divider = -1,
};
static struct gpio tosa_bat_gpios[] = {
{ TOSA_GPIO_CHARGE_OFF, GPIOF_OUT_INIT_HIGH, "main charge off" },
{ TOSA_GPIO_CHARGE_OFF_JC, GPIOF_OUT_INIT_HIGH, "jacket charge off" },
{ TOSA_GPIO_BAT_SW_ON, GPIOF_OUT_INIT_LOW, "battery switch" },
{ TOSA_GPIO_BAT0_V_ON, GPIOF_OUT_INIT_LOW, "main battery" },
{ TOSA_GPIO_BAT1_V_ON, GPIOF_OUT_INIT_LOW, "jacket battery" },
{ TOSA_GPIO_BAT1_TH_ON, GPIOF_OUT_INIT_LOW, "main battery temp" },
{ TOSA_GPIO_BAT0_TH_ON, GPIOF_OUT_INIT_LOW, "jacket battery temp" },
{ TOSA_GPIO_BU_CHRG_ON, GPIOF_OUT_INIT_LOW, "backup battery" },
{ TOSA_GPIO_BAT0_CRG, GPIOF_IN, "main battery full" },
{ TOSA_GPIO_BAT1_CRG, GPIOF_IN, "jacket battery full" },
{ TOSA_GPIO_BAT0_LOW, GPIOF_IN, "main battery low" },
{ TOSA_GPIO_BAT1_LOW, GPIOF_IN, "jacket battery low" },
{ TOSA_GPIO_JACKET_DETECT, GPIOF_IN, "jacket detect" },
};
#ifdef CONFIG_PM
static int tosa_bat_suspend(struct platform_device *dev, pm_message_t state)
{
/* flush all pending status updates */
flush_work(&bat_work);
return 0;
}
static int tosa_bat_resume(struct platform_device *dev)
{
/* things may have changed while we were away */
schedule_work(&bat_work);
return 0;
}
#else
#define tosa_bat_suspend NULL
#define tosa_bat_resume NULL
#endif
static int __devinit tosa_bat_probe(struct platform_device *dev)
{
int ret;
if (!machine_is_tosa())
return -ENODEV;
ret = gpio_request_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
if (ret)
return ret;
mutex_init(&tosa_bat_main.work_lock);
mutex_init(&tosa_bat_jacket.work_lock);
INIT_WORK(&bat_work, tosa_bat_work);
ret = power_supply_register(&dev->dev, &tosa_bat_main.psy);
if (ret)
goto err_psy_reg_main;
ret = power_supply_register(&dev->dev, &tosa_bat_jacket.psy);
if (ret)
goto err_psy_reg_jacket;
ret = power_supply_register(&dev->dev, &tosa_bat_bu.psy);
if (ret)
goto err_psy_reg_bu;
ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG),
tosa_bat_gpio_isr,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
"main full", &tosa_bat_main);
if (ret)
goto err_req_main;
ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG),
tosa_bat_gpio_isr,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
"jacket full", &tosa_bat_jacket);
if (ret)
goto err_req_jacket;
ret = request_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT),
tosa_bat_gpio_isr,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
"jacket detect", &tosa_bat_jacket);
if (!ret) {
schedule_work(&bat_work);
return 0;
}
free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
err_req_jacket:
free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);
err_req_main:
power_supply_unregister(&tosa_bat_bu.psy);
err_psy_reg_bu:
power_supply_unregister(&tosa_bat_jacket.psy);
err_psy_reg_jacket:
power_supply_unregister(&tosa_bat_main.psy);
err_psy_reg_main:
/* see comment in tosa_bat_remove */
cancel_work_sync(&bat_work);
gpio_free_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
return ret;
}
static int __devexit tosa_bat_remove(struct platform_device *dev)
{
free_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT), &tosa_bat_jacket);
free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);
power_supply_unregister(&tosa_bat_bu.psy);
power_supply_unregister(&tosa_bat_jacket.psy);
power_supply_unregister(&tosa_bat_main.psy);
/*
* Now cancel the bat_work. We won't get any more schedules,
* since all sources (isr and external_power_changed) are
* unregistered now.
*/
cancel_work_sync(&bat_work);
gpio_free_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
return 0;
}
static struct platform_driver tosa_bat_driver = {
.driver.name = "wm97xx-battery",
.driver.owner = THIS_MODULE,
.probe = tosa_bat_probe,
.remove = __devexit_p(tosa_bat_remove),
.suspend = tosa_bat_suspend,
.resume = tosa_bat_resume,
};
module_platform_driver(tosa_bat_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Dmitry Baryshkov");
MODULE_DESCRIPTION("Tosa battery driver");
MODULE_ALIAS("platform:wm97xx-battery");
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