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authorDavid Herrmann <dh.herrmann@googlemail.com>2012-06-10 15:16:13 +0200
committerJiri Kosina <jkosina@suse.cz>2012-06-18 13:41:59 +0200
commit1ccd7a2a33f2b47e46c51f4501e9623a51d28090 (patch)
treebfcee4e23158ec8eb777c77ef3ea1d484dde7fff /drivers/hid/uhid.c
parent3c2c4b73aa79e4a1b601710b59e092441175f4bb (diff)
HID: uhid: introduce user-space I/O driver support for HID
This adds a dummy driver that will support user-space I/O drivers for the HID subsystem. This allows to write transport-level drivers like USB-HID and Bluetooth-HID in user-space. Low-Energy Bluetooth needs this to feed HID data that is parsed in user-space back into the kernel. Signed-off-by: David Herrmann <dh.herrmann@googlemail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/uhid.c')
-rw-r--r--drivers/hid/uhid.c88
1 files changed, 88 insertions, 0 deletions
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");

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