Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / input / misc / gpio-beeper.c

diff --git a/kernel/drivers/input/misc/gpio-beeper.c b/kernel/drivers/input/misc/gpio-beeper.c
new file mode 100644 (file)
index 0000000..4817c5f
--- /dev/null
+++ b/kernel/drivers/input/misc/gpio-beeper.c
@@ -0,0 +1,123 @@
+/*
+ * Generic GPIO beeper driver
+ *
+ * Copyright (C) 2013-2014 Alexander Shiyan <shc_work@mail.ru>
+ *
+ * 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/gpio/consumer.h>
+#include <linux/of.h>
+#include <linux/workqueue.h>
+#include <linux/platform_device.h>
+
+#define BEEPER_MODNAME         "gpio-beeper"
+
+struct gpio_beeper {
+       struct work_struct      work;
+       struct gpio_desc        *desc;
+       bool                    beeping;
+};
+
+static void gpio_beeper_toggle(struct gpio_beeper *beep, bool on)
+{
+       gpiod_set_value_cansleep(beep->desc, on);
+}
+
+static void gpio_beeper_work(struct work_struct *work)
+{
+       struct gpio_beeper *beep = container_of(work, struct gpio_beeper, work);
+
+       gpio_beeper_toggle(beep, beep->beeping);
+}
+
+static int gpio_beeper_event(struct input_dev *dev, unsigned int type,
+                            unsigned int code, int value)
+{
+       struct gpio_beeper *beep = input_get_drvdata(dev);
+
+       if (type != EV_SND || code != SND_BELL)
+               return -ENOTSUPP;
+
+       if (value < 0)
+               return -EINVAL;
+
+       beep->beeping = value;
+       /* Schedule work to actually turn the beeper on or off */
+       schedule_work(&beep->work);
+
+       return 0;
+}
+
+static void gpio_beeper_close(struct input_dev *input)
+{
+       struct gpio_beeper *beep = input_get_drvdata(input);
+
+       cancel_work_sync(&beep->work);
+       gpio_beeper_toggle(beep, false);
+}
+
+static int gpio_beeper_probe(struct platform_device *pdev)
+{
+       struct gpio_beeper *beep;
+       struct input_dev *input;
+       int err;
+
+       beep = devm_kzalloc(&pdev->dev, sizeof(*beep), GFP_KERNEL);
+       if (!beep)
+               return -ENOMEM;
+
+       beep->desc = devm_gpiod_get(&pdev->dev, NULL);
+       if (IS_ERR(beep->desc))
+               return PTR_ERR(beep->desc);
+
+       input = devm_input_allocate_device(&pdev->dev);
+       if (!input)
+               return -ENOMEM;
+
+       INIT_WORK(&beep->work, gpio_beeper_work);
+
+       input->name             = pdev->name;
+       input->id.bustype       = BUS_HOST;
+       input->id.vendor        = 0x0001;
+       input->id.product       = 0x0001;
+       input->id.version       = 0x0100;
+       input->close            = gpio_beeper_close;
+       input->event            = gpio_beeper_event;
+
+       input_set_capability(input, EV_SND, SND_BELL);
+
+       err = gpiod_direction_output(beep->desc, 0);
+       if (err)
+               return err;
+
+       input_set_drvdata(input, beep);
+
+       return input_register_device(input);
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id gpio_beeper_of_match[] = {
+       { .compatible = BEEPER_MODNAME, },
+       { }
+};
+MODULE_DEVICE_TABLE(of, gpio_beeper_of_match);
+#endif
+
+static struct platform_driver gpio_beeper_platform_driver = {
+       .driver = {
+               .name           = BEEPER_MODNAME,
+               .of_match_table = of_match_ptr(gpio_beeper_of_match),
+       },
+       .probe  = gpio_beeper_probe,
+};
+module_platform_driver(gpio_beeper_platform_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
+MODULE_DESCRIPTION("Generic GPIO beeper driver");