Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / input / misc / wm831x-on.c

diff --git a/kernel/drivers/input/misc/wm831x-on.c b/kernel/drivers/input/misc/wm831x-on.c
new file mode 100644 (file)
index 0000000..59d4f7b
--- /dev/null
+++ b/kernel/drivers/input/misc/wm831x-on.c
@@ -0,0 +1,149 @@
+/**
+ * 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)
+{
+       struct wm831x_on *wm831x_on = data;
+
+       schedule_delayed_work(&wm831x_on->work, 0);
+
+       return IRQ_HANDLED;
+}
+
+static int wm831x_on_probe(struct platform_device *pdev)
+{
+       struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
+       struct wm831x_on *wm831x_on;
+       int irq = wm831x_irq(wm831x, platform_get_irq(pdev, 0));
+       int ret;
+
+       wm831x_on = devm_kzalloc(&pdev->dev, 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 = devm_input_allocate_device(&pdev->dev);
+       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 = request_threaded_irq(irq, NULL, 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:
+       free_irq(irq, wm831x_on);
+err_input_dev:
+err:
+       return ret;
+}
+
+static int wm831x_on_remove(struct platform_device *pdev)
+{
+       struct wm831x_on *wm831x_on = platform_get_drvdata(pdev);
+       int irq = platform_get_irq(pdev, 0);
+
+       free_irq(irq, wm831x_on);
+       cancel_delayed_work_sync(&wm831x_on->work);
+
+       return 0;
+}
+
+static struct platform_driver wm831x_on_driver = {
+       .probe          = wm831x_on_probe,
+       .remove         = wm831x_on_remove,
+       .driver         = {
+               .name   = "wm831x-on",
+       },
+};
+module_platform_driver(wm831x_on_driver);
+
+MODULE_ALIAS("platform:wm831x-on");
+MODULE_DESCRIPTION("WM831x ON pin");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
+