1 files changed, 163 insertions, 0 deletions

diff --git a/drivers/input/misc/wm831x-on.c b/drivers/input/misc/wm831x-on.c
new file mode 100644
index 000000000000..ba4f5dd7c60e
--- /dev/null
+++ b/drivers/input/misc/wm831x-on.c
@@ -0,0 +1,163 @@
+/**
+ * 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>");
+