164 lines
4.2 KiB
C
164 lines
4.2 KiB
C
/**
|
|
* wm831x-on.c - WM831X ON pin driver
|
|
*
|
|
* Copyright (C) 2009 Wolfson Microelectronics plc
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General
|
|
* Public License. See the file "COPYING" in the main directory of this
|
|
* archive for more details.
|
|
*
|
|
* 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/input.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/mfd/wm831x/core.h>
|
|
|
|
struct wm831x_on {
|
|
struct input_dev *dev;
|
|
struct delayed_work work;
|
|
struct wm831x *wm831x;
|
|
};
|
|
|
|
/*
|
|
* The chip gives us an interrupt when the ON pin is asserted but we
|
|
* then need to poll to see when the pin is deasserted.
|
|
*/
|
|
static void wm831x_poll_on(struct work_struct *work)
|
|
{
|
|
struct wm831x_on *wm831x_on = container_of(work, struct wm831x_on,
|
|
work.work);
|
|
struct wm831x *wm831x = wm831x_on->wm831x;
|
|
int poll, ret;
|
|
|
|
ret = wm831x_reg_read(wm831x, WM831X_ON_PIN_CONTROL);
|
|
if (ret >= 0) {
|
|
poll = !(ret & WM831X_ON_PIN_STS);
|
|
|
|
input_report_key(wm831x_on->dev, KEY_POWER, poll);
|
|
input_sync(wm831x_on->dev);
|
|
} else {
|
|
dev_err(wm831x->dev, "Failed to read ON status: %d\n", ret);
|
|
poll = 1;
|
|
}
|
|
|
|
if (poll)
|
|
schedule_delayed_work(&wm831x_on->work, 100);
|
|
}
|
|
|
|
static irqreturn_t wm831x_on_irq(int irq, void *data)
|
|
{
|
|
struct wm831x_on *wm831x_on = data;
|
|
|
|
schedule_delayed_work(&wm831x_on->work, 0);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int __devinit wm831x_on_probe(struct platform_device *pdev)
|
|
{
|
|
struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
|
|
struct wm831x_on *wm831x_on;
|
|
int irq = platform_get_irq(pdev, 0);
|
|
int ret;
|
|
|
|
wm831x_on = kzalloc(sizeof(struct wm831x_on), GFP_KERNEL);
|
|
if (!wm831x_on) {
|
|
dev_err(&pdev->dev, "Can't allocate data\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
wm831x_on->wm831x = wm831x;
|
|
INIT_DELAYED_WORK(&wm831x_on->work, wm831x_poll_on);
|
|
|
|
wm831x_on->dev = input_allocate_device();
|
|
if (!wm831x_on->dev) {
|
|
dev_err(&pdev->dev, "Can't allocate input dev\n");
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
|
|
wm831x_on->dev->evbit[0] = BIT_MASK(EV_KEY);
|
|
wm831x_on->dev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
|
|
wm831x_on->dev->name = "wm831x_on";
|
|
wm831x_on->dev->phys = "wm831x_on/input0";
|
|
wm831x_on->dev->dev.parent = &pdev->dev;
|
|
|
|
ret = wm831x_request_irq(wm831x, irq, wm831x_on_irq,
|
|
IRQF_TRIGGER_RISING, "wm831x_on", wm831x_on);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Unable to request IRQ: %d\n", ret);
|
|
goto err_input_dev;
|
|
}
|
|
ret = input_register_device(wm831x_on->dev);
|
|
if (ret) {
|
|
dev_dbg(&pdev->dev, "Can't register input device: %d\n", ret);
|
|
goto err_irq;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, wm831x_on);
|
|
|
|
return 0;
|
|
|
|
err_irq:
|
|
wm831x_free_irq(wm831x, irq, NULL);
|
|
err_input_dev:
|
|
input_free_device(wm831x_on->dev);
|
|
err:
|
|
kfree(wm831x_on);
|
|
return ret;
|
|
}
|
|
|
|
static int __devexit wm831x_on_remove(struct platform_device *pdev)
|
|
{
|
|
struct wm831x_on *wm831x_on = platform_get_drvdata(pdev);
|
|
int irq = platform_get_irq(pdev, 0);
|
|
|
|
wm831x_free_irq(wm831x_on->wm831x, irq, wm831x_on);
|
|
cancel_delayed_work_sync(&wm831x_on->work);
|
|
input_unregister_device(wm831x_on->dev);
|
|
kfree(wm831x_on);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver wm831x_on_driver = {
|
|
.probe = wm831x_on_probe,
|
|
.remove = __devexit_p(wm831x_on_remove),
|
|
.driver = {
|
|
.name = "wm831x-on",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init wm831x_on_init(void)
|
|
{
|
|
return platform_driver_register(&wm831x_on_driver);
|
|
}
|
|
module_init(wm831x_on_init);
|
|
|
|
static void __exit wm831x_on_exit(void)
|
|
{
|
|
platform_driver_unregister(&wm831x_on_driver);
|
|
}
|
|
module_exit(wm831x_on_exit);
|
|
|
|
MODULE_ALIAS("platform:wm831x-on");
|
|
MODULE_DESCRIPTION("WM831x ON pin");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
|
|
|