linux/drivers/power/wm97xx_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

296 lines
7.1 KiB
C

/*
* linux/drivers/power/wm97xx_battery.c
*
* Battery measurement code for WM97xx
*
* based on tosa_battery.c
*
* Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
*
* 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/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/wm97xx.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/irq.h>
#include <linux/slab.h>
static struct work_struct bat_work;
static DEFINE_MUTEX(work_lock);
static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
static enum power_supply_property *prop;
static unsigned long wm97xx_read_bat(struct power_supply *bat_ps)
{
struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev->parent),
pdata->batt_aux) * pdata->batt_mult /
pdata->batt_div;
}
static unsigned long wm97xx_read_temp(struct power_supply *bat_ps)
{
struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev->parent),
pdata->temp_aux) * pdata->temp_mult /
pdata->temp_div;
}
static int wm97xx_bat_get_property(struct power_supply *bat_ps,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
val->intval = bat_status;
break;
case POWER_SUPPLY_PROP_TECHNOLOGY:
val->intval = pdata->batt_tech;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
if (pdata->batt_aux >= 0)
val->intval = wm97xx_read_bat(bat_ps);
else
return -EINVAL;
break;
case POWER_SUPPLY_PROP_TEMP:
if (pdata->temp_aux >= 0)
val->intval = wm97xx_read_temp(bat_ps);
else
return -EINVAL;
break;
case POWER_SUPPLY_PROP_VOLTAGE_MAX:
if (pdata->max_voltage >= 0)
val->intval = pdata->max_voltage;
else
return -EINVAL;
break;
case POWER_SUPPLY_PROP_VOLTAGE_MIN:
if (pdata->min_voltage >= 0)
val->intval = pdata->min_voltage;
else
return -EINVAL;
break;
case POWER_SUPPLY_PROP_PRESENT:
val->intval = 1;
break;
default:
return -EINVAL;
}
return 0;
}
static void wm97xx_bat_external_power_changed(struct power_supply *bat_ps)
{
schedule_work(&bat_work);
}
static void wm97xx_bat_update(struct power_supply *bat_ps)
{
int old_status = bat_status;
struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
mutex_lock(&work_lock);
bat_status = (pdata->charge_gpio >= 0) ?
(gpio_get_value(pdata->charge_gpio) ?
POWER_SUPPLY_STATUS_DISCHARGING :
POWER_SUPPLY_STATUS_CHARGING) :
POWER_SUPPLY_STATUS_UNKNOWN;
if (old_status != bat_status) {
pr_debug("%s: %i -> %i\n", bat_ps->name, old_status,
bat_status);
power_supply_changed(bat_ps);
}
mutex_unlock(&work_lock);
}
static struct power_supply bat_ps = {
.type = POWER_SUPPLY_TYPE_BATTERY,
.get_property = wm97xx_bat_get_property,
.external_power_changed = wm97xx_bat_external_power_changed,
.use_for_apm = 1,
};
static void wm97xx_bat_work(struct work_struct *work)
{
wm97xx_bat_update(&bat_ps);
}
static irqreturn_t wm97xx_chrg_irq(int irq, void *data)
{
schedule_work(&bat_work);
return IRQ_HANDLED;
}
#ifdef CONFIG_PM
static int wm97xx_bat_suspend(struct device *dev)
{
flush_work(&bat_work);
return 0;
}
static int wm97xx_bat_resume(struct device *dev)
{
schedule_work(&bat_work);
return 0;
}
static const struct dev_pm_ops wm97xx_bat_pm_ops = {
.suspend = wm97xx_bat_suspend,
.resume = wm97xx_bat_resume,
};
#endif
static int __devinit wm97xx_bat_probe(struct platform_device *dev)
{
int ret = 0;
int props = 1; /* POWER_SUPPLY_PROP_PRESENT */
int i = 0;
struct wm97xx_pdata *wmdata = dev->dev.platform_data;
struct wm97xx_batt_pdata *pdata;
if (!wmdata) {
dev_err(&dev->dev, "No platform data supplied\n");
return -EINVAL;
}
pdata = wmdata->batt_pdata;
if (dev->id != -1)
return -EINVAL;
if (!pdata) {
dev_err(&dev->dev, "No platform_data supplied\n");
return -EINVAL;
}
if (gpio_is_valid(pdata->charge_gpio)) {
ret = gpio_request(pdata->charge_gpio, "BATT CHRG");
if (ret)
goto err;
ret = gpio_direction_input(pdata->charge_gpio);
if (ret)
goto err2;
ret = request_irq(gpio_to_irq(pdata->charge_gpio),
wm97xx_chrg_irq, 0,
"AC Detect", dev);
if (ret)
goto err2;
props++; /* POWER_SUPPLY_PROP_STATUS */
}
if (pdata->batt_tech >= 0)
props++; /* POWER_SUPPLY_PROP_TECHNOLOGY */
if (pdata->temp_aux >= 0)
props++; /* POWER_SUPPLY_PROP_TEMP */
if (pdata->batt_aux >= 0)
props++; /* POWER_SUPPLY_PROP_VOLTAGE_NOW */
if (pdata->max_voltage >= 0)
props++; /* POWER_SUPPLY_PROP_VOLTAGE_MAX */
if (pdata->min_voltage >= 0)
props++; /* POWER_SUPPLY_PROP_VOLTAGE_MIN */
prop = kzalloc(props * sizeof(*prop), GFP_KERNEL);
if (!prop)
goto err3;
prop[i++] = POWER_SUPPLY_PROP_PRESENT;
if (pdata->charge_gpio >= 0)
prop[i++] = POWER_SUPPLY_PROP_STATUS;
if (pdata->batt_tech >= 0)
prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
if (pdata->temp_aux >= 0)
prop[i++] = POWER_SUPPLY_PROP_TEMP;
if (pdata->batt_aux >= 0)
prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW;
if (pdata->max_voltage >= 0)
prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX;
if (pdata->min_voltage >= 0)
prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN;
INIT_WORK(&bat_work, wm97xx_bat_work);
if (!pdata->batt_name) {
dev_info(&dev->dev, "Please consider setting proper battery "
"name in platform definition file, falling "
"back to name \"wm97xx-batt\"\n");
bat_ps.name = "wm97xx-batt";
} else
bat_ps.name = pdata->batt_name;
bat_ps.properties = prop;
bat_ps.num_properties = props;
ret = power_supply_register(&dev->dev, &bat_ps);
if (!ret)
schedule_work(&bat_work);
else
goto err4;
return 0;
err4:
kfree(prop);
err3:
if (gpio_is_valid(pdata->charge_gpio))
free_irq(gpio_to_irq(pdata->charge_gpio), dev);
err2:
if (gpio_is_valid(pdata->charge_gpio))
gpio_free(pdata->charge_gpio);
err:
return ret;
}
static int __devexit wm97xx_bat_remove(struct platform_device *dev)
{
struct wm97xx_pdata *wmdata = dev->dev.platform_data;
struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
if (pdata && gpio_is_valid(pdata->charge_gpio)) {
free_irq(gpio_to_irq(pdata->charge_gpio), dev);
gpio_free(pdata->charge_gpio);
}
cancel_work_sync(&bat_work);
power_supply_unregister(&bat_ps);
kfree(prop);
return 0;
}
static struct platform_driver wm97xx_bat_driver = {
.driver = {
.name = "wm97xx-battery",
.owner = THIS_MODULE,
#ifdef CONFIG_PM
.pm = &wm97xx_bat_pm_ops,
#endif
},
.probe = wm97xx_bat_probe,
.remove = __devexit_p(wm97xx_bat_remove),
};
module_platform_driver(wm97xx_bat_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
MODULE_DESCRIPTION("WM97xx battery driver");