Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / input / misc / da9055_onkey.c

diff --git a/kernel/drivers/input/misc/da9055_onkey.c b/kernel/drivers/input/misc/da9055_onkey.c
new file mode 100644 (file)
index 0000000..3251a96
--- /dev/null
+++ b/kernel/drivers/input/misc/da9055_onkey.c
@@ -0,0 +1,168 @@
+/*
+ * ON pin driver for Dialog DA9055 PMICs
+ *
+ * Copyright(c) 2012 Dialog Semiconductor Ltd.
+ *
+ * Author: David Dajun Chen <dchen@diasemi.com>
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/input.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <linux/mfd/da9055/core.h>
+#include <linux/mfd/da9055/reg.h>
+
+struct da9055_onkey {
+       struct da9055 *da9055;
+       struct input_dev *input;
+       struct delayed_work work;
+};
+
+static void da9055_onkey_query(struct da9055_onkey *onkey)
+{
+       int key_stat;
+
+       key_stat = da9055_reg_read(onkey->da9055, DA9055_REG_STATUS_A);
+       if (key_stat < 0) {
+               dev_err(onkey->da9055->dev,
+                       "Failed to read onkey event %d\n", key_stat);
+       } else {
+               key_stat &= DA9055_NOKEY_STS;
+               /*
+                * Onkey status bit is cleared when onkey button is released.
+                */
+               if (!key_stat) {
+                       input_report_key(onkey->input, KEY_POWER, 0);
+                       input_sync(onkey->input);
+               }
+       }
+
+       /*
+        * Interrupt is generated only when the ONKEY pin is asserted.
+        * Hence the deassertion of the pin is simulated through work queue.
+        */
+       if (key_stat)
+               schedule_delayed_work(&onkey->work, msecs_to_jiffies(10));
+
+}
+
+static void da9055_onkey_work(struct work_struct *work)
+{
+       struct da9055_onkey *onkey = container_of(work, struct da9055_onkey,
+                                                 work.work);
+
+       da9055_onkey_query(onkey);
+}
+
+static irqreturn_t da9055_onkey_irq(int irq, void *data)
+{
+       struct da9055_onkey *onkey = data;
+
+       input_report_key(onkey->input, KEY_POWER, 1);
+       input_sync(onkey->input);
+
+       da9055_onkey_query(onkey);
+
+       return IRQ_HANDLED;
+}
+
+static int da9055_onkey_probe(struct platform_device *pdev)
+{
+       struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);
+       struct da9055_onkey *onkey;
+       struct input_dev *input_dev;
+       int irq, err;
+
+       irq = platform_get_irq_byname(pdev, "ONKEY");
+       if (irq < 0) {
+               dev_err(&pdev->dev,
+                       "Failed to get an IRQ for input device, %d\n", irq);
+               return -EINVAL;
+       }
+
+       onkey = devm_kzalloc(&pdev->dev, sizeof(*onkey), GFP_KERNEL);
+       if (!onkey) {
+               dev_err(&pdev->dev, "Failed to allocate memory\n");
+               return -ENOMEM;
+       }
+
+       input_dev = input_allocate_device();
+       if (!input_dev) {
+               dev_err(&pdev->dev, "Failed to allocate memory\n");
+               return -ENOMEM;
+       }
+
+       onkey->input = input_dev;
+       onkey->da9055 = da9055;
+       input_dev->name = "da9055-onkey";
+       input_dev->phys = "da9055-onkey/input0";
+       input_dev->dev.parent = &pdev->dev;
+
+       input_dev->evbit[0] = BIT_MASK(EV_KEY);
+       __set_bit(KEY_POWER, input_dev->keybit);
+
+       INIT_DELAYED_WORK(&onkey->work, da9055_onkey_work);
+
+       err = request_threaded_irq(irq, NULL, da9055_onkey_irq,
+                                  IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
+                                  "ONKEY", onkey);
+       if (err < 0) {
+               dev_err(&pdev->dev,
+                       "Failed to register ONKEY IRQ %d, error = %d\n",
+                       irq, err);
+               goto err_free_input;
+       }
+
+       err = input_register_device(input_dev);
+       if (err) {
+               dev_err(&pdev->dev, "Unable to register input device, %d\n",
+                       err);
+               goto err_free_irq;
+       }
+
+       platform_set_drvdata(pdev, onkey);
+
+       return 0;
+
+err_free_irq:
+       free_irq(irq, onkey);
+       cancel_delayed_work_sync(&onkey->work);
+err_free_input:
+       input_free_device(input_dev);
+
+       return err;
+}
+
+static int da9055_onkey_remove(struct platform_device *pdev)
+{
+       struct da9055_onkey *onkey = platform_get_drvdata(pdev);
+       int irq = platform_get_irq_byname(pdev, "ONKEY");
+
+       irq = regmap_irq_get_virq(onkey->da9055->irq_data, irq);
+       free_irq(irq, onkey);
+       cancel_delayed_work_sync(&onkey->work);
+       input_unregister_device(onkey->input);
+
+       return 0;
+}
+
+static struct platform_driver da9055_onkey_driver = {
+       .probe  = da9055_onkey_probe,
+       .remove = da9055_onkey_remove,
+       .driver = {
+               .name   = "da9055-onkey",
+       },
+};
+
+module_platform_driver(da9055_onkey_driver);
+
+MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
+MODULE_DESCRIPTION("Onkey driver for DA9055");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:da9055-onkey");