/**
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* wm831x-on.c - WM831X ON pin driver
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*
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* Copyright (C) 2009 Wolfson Microelectronics plc
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file "COPYING" in the main directory of this
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* archive for more details.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/workqueue.h>
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#include <linux/mfd/wm831x/core.h>
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struct wm831x_on {
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struct input_dev *dev;
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struct delayed_work work;
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struct wm831x *wm831x;
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};
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/*
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* The chip gives us an interrupt when the ON pin is asserted but we
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* then need to poll to see when the pin is deasserted.
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*/
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static void wm831x_poll_on(struct work_struct *work)
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{
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struct wm831x_on *wm831x_on = container_of(work, struct wm831x_on,
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work.work);
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struct wm831x *wm831x = wm831x_on->wm831x;
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int poll, ret;
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ret = wm831x_reg_read(wm831x, WM831X_ON_PIN_CONTROL);
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if (ret >= 0) {
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poll = !(ret & WM831X_ON_PIN_STS);
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input_report_key(wm831x_on->dev, KEY_POWER, poll);
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input_sync(wm831x_on->dev);
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} else {
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dev_err(wm831x->dev, "Failed to read ON status: %d\n", ret);
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poll = 1;
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}
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if (poll)
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schedule_delayed_work(&wm831x_on->work, 100);
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}
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static irqreturn_t wm831x_on_irq(int irq, void *data)
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{
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struct wm831x_on *wm831x_on = data;
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schedule_delayed_work(&wm831x_on->work, 0);
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return IRQ_HANDLED;
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}
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static int wm831x_on_probe(struct platform_device *pdev)
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{
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struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
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struct wm831x_on *wm831x_on;
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int irq = wm831x_irq(wm831x, platform_get_irq(pdev, 0));
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int ret;
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wm831x_on = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_on),
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GFP_KERNEL);
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if (!wm831x_on) {
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dev_err(&pdev->dev, "Can't allocate data\n");
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return -ENOMEM;
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}
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wm831x_on->wm831x = wm831x;
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INIT_DELAYED_WORK(&wm831x_on->work, wm831x_poll_on);
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wm831x_on->dev = devm_input_allocate_device(&pdev->dev);
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if (!wm831x_on->dev) {
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dev_err(&pdev->dev, "Can't allocate input dev\n");
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ret = -ENOMEM;
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goto err;
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}
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wm831x_on->dev->evbit[0] = BIT_MASK(EV_KEY);
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wm831x_on->dev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
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wm831x_on->dev->name = "wm831x_on";
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wm831x_on->dev->phys = "wm831x_on/input0";
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wm831x_on->dev->dev.parent = &pdev->dev;
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ret = request_threaded_irq(irq, NULL, wm831x_on_irq,
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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"wm831x_on",
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wm831x_on);
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if (ret < 0) {
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dev_err(&pdev->dev, "Unable to request IRQ: %d\n", ret);
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goto err_input_dev;
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}
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ret = input_register_device(wm831x_on->dev);
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if (ret) {
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dev_dbg(&pdev->dev, "Can't register input device: %d\n", ret);
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goto err_irq;
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}
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platform_set_drvdata(pdev, wm831x_on);
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return 0;
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err_irq:
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free_irq(irq, wm831x_on);
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err_input_dev:
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err:
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return ret;
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}
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static int wm831x_on_remove(struct platform_device *pdev)
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{
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struct wm831x_on *wm831x_on = platform_get_drvdata(pdev);
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int irq = platform_get_irq(pdev, 0);
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free_irq(irq, wm831x_on);
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cancel_delayed_work_sync(&wm831x_on->work);
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return 0;
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}
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static struct platform_driver wm831x_on_driver = {
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.probe = wm831x_on_probe,
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.remove = wm831x_on_remove,
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.driver = {
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.name = "wm831x-on",
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},
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};
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module_platform_driver(wm831x_on_driver);
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MODULE_ALIAS("platform:wm831x-on");
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MODULE_DESCRIPTION("WM831x ON pin");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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