linux-imx

/**

 * 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/slab.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)

{