3 files changed, 110 insertions, 0 deletions

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index e9c68fedfcff..8cca0af2dbd1 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -59,6 +59,27 @@ config HIDRAW
 
         If unsure, say Y.
 
+config UHID
+        tristate "User-space I/O driver support for HID subsystem"
+        depends on HID
+        default n
+        ---help---
+        Say Y here if you want to provide HID I/O Drivers from user-space.
+        This allows to write I/O drivers in user-space and feed the data from
+        the device into the kernel. The kernel parses the HID reports, loads the
+        corresponding HID Device Driver or provides input devices on top of your
+        user-space device.
+
+        This driver cannot be used to parse HID-reports in user-space and write
+        special HID-drivers. You should use hidraw for that.
+        Instead, this driver allows to write the transport-layer driver in
+        user-space like USB-HID and Bluetooth-HID do in kernel-space.
+
+        If unsure, say N.
+
+        To compile this driver as a module, choose M here: the
+        module will be called uhid.
+
 source "drivers/hid/usbhid/Kconfig"
 
 menu "Special HID drivers"
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index ca6cc9f0485c..d7061928325e 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -8,6 +8,7 @@ ifdef CONFIG_DEBUG_FS
 endif
 
 obj-$(CONFIG_HID)               += hid.o
+obj-$(CONFIG_UHID)              += uhid.o
 
 obj-$(CONFIG_HID_GENERIC)       += hid-generic.o
 
diff --git a/drivers/hid/uhid.c b/drivers/hid/uhid.c
new file mode 100644
index 000000000000..5b02d6cb0e60
--- /dev/null
+++ b/drivers/hid/uhid.c
@@ -0,0 +1,88 @@
+/*
+ * User-space I/O driver support for HID subsystem
+ * Copyright (c) 2012 David Herrmann
+ */
+
+/*
+ * 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/atomic.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/hid.h>
+#include <linux/input.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/poll.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/uhid.h>
+#include <linux/wait.h>
+
+#define UHID_NAME       "uhid"
+
+static struct miscdevice uhid_misc;
+
+static int uhid_char_open(struct inode *inode, struct file *file)
+{
+        return 0;
+}
+
+static int uhid_char_release(struct inode *inode, struct file *file)
+{
+        return 0;
+}
+
+static ssize_t uhid_char_read(struct file *file, char __user *buffer,
+                                size_t count, loff_t *ppos)
+{
+        return 0;
+}
+
+static ssize_t uhid_char_write(struct file *file, const char __user *buffer,
+                                size_t count, loff_t *ppos)
+{
+        return 0;
+}
+
+static unsigned int uhid_char_poll(struct file *file, poll_table *wait)
+{
+        return 0;
+}
+
+static const struct file_operations uhid_fops = {
+        .owner          = THIS_MODULE,
+        .open           = uhid_char_open,
+        .release        = uhid_char_release,
+        .read           = uhid_char_read,
+        .write          = uhid_char_write,
+        .poll           = uhid_char_poll,
+        .llseek         = no_llseek,
+};
+
+static struct miscdevice uhid_misc = {
+        .fops           = &uhid_fops,
+        .minor          = MISC_DYNAMIC_MINOR,
+        .name           = UHID_NAME,
+};
+
+static int __init uhid_init(void)
+{
+        return misc_register(&uhid_misc);
+}
+
+static void __exit uhid_exit(void)
+{
+        misc_deregister(&uhid_misc);
+}
+
+module_init(uhid_init);
+module_exit(uhid_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>");
+MODULE_DESCRIPTION("User-space I/O driver support for HID subsystem");