patch-2.3.36 linux/drivers/usb/evdev.c

• Lines: 276
• Date: Sun Jan 2 12:12:59 2000
• Orig file: v2.3.35/linux/drivers/usb/evdev.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.35/linux/drivers/usb/evdev.c linux/drivers/usb/evdev.c
@@ -0,0 +1,275 @@
+/*
+ *  evdev.c  Version 0.1
+ *
+ *  Copyright (c) 1999 Vojtech Pavlik
+ *
+ *  Event char devices, giving access to raw input device events.
+ *
+ *  Sponsored by SuSE
+ */
+
+/*
+ * 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.
+ * 
+ * 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
+ * 
+ * Should you need to contact me, the author, you can do so either by
+ * e-mail - mail your message to <[email protected]>, or by paper mail:
+ * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic
+ */
+
+#define EVDEV_MINOR_BASE	64
+#define EVDEV_BUFFER_SIZE	64
+
+#include <linux/miscdevice.h>
+#include <linux/poll.h>
+#include <linux/malloc.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/input.h>
+
+struct evdev {
+	char name[32];
+	int used;
+	struct input_handle handle;
+	struct miscdevice misc;
+	wait_queue_head_t wait;
+	struct evdev_list *list;
+};
+
+struct evdev_list {
+	struct input_event buffer[EVDEV_BUFFER_SIZE];
+	int head;
+	int tail;
+	struct fasync_struct *fasync;
+	struct evdev *evdev;
+	struct evdev_list *next;
+};
+
+static unsigned long evdev_miscbits = 0;
+static struct evdev *evdev_base[BITS_PER_LONG];
+
+static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
+{
+	struct evdev *evdev = handle->private;
+	struct evdev_list *list = evdev->list;
+
+	while (list) {
+
+		get_fast_time(&list->buffer[list->head].time);
+		list->buffer[list->head].type = type;
+		list->buffer[list->head].code = code;
+		list->buffer[list->head].value = value;
+		list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);
+		
+		if (list->fasync)
+			kill_fasync(list->fasync, SIGIO, POLL_IN);
+
+		list = list->next;
+	}
+
+	wake_up_interruptible(&evdev->wait);
+}
+
+static int evdev_fasync(int fd, struct file *file, int on)
+{
+	int retval;
+	struct evdev_list *list = file->private_data;
+	retval = fasync_helper(fd, file, on, &list->fasync);
+	return retval < 0 ? retval : 0;
+}
+
+static int evdev_release(struct inode * inode, struct file * file)
+{
+	struct evdev_list *list = file->private_data;
+	struct evdev_list **listptr = &list->evdev->list;
+
+	evdev_fasync(-1, file, 0);
+
+	while (*listptr && (*listptr != list))
+		listptr = &((*listptr)->next);
+	*listptr = (*listptr)->next;
+	
+	if (!--list->evdev->used) {
+		clear_bit(list->evdev->misc.minor - EVDEV_MINOR_BASE, &evdev_miscbits);
+		misc_deregister(&list->evdev->misc);
+		kfree(list->evdev);
+	}
+
+	kfree(list);
+
+	MOD_DEC_USE_COUNT;
+	return 0;
+}
+
+static int evdev_open(struct inode * inode, struct file * file)
+{
+	struct evdev_list *list;
+	int i = MINOR(inode->i_rdev) - EVDEV_MINOR_BASE;
+
+	if (i > BITS_PER_LONG || !test_bit(i, &evdev_miscbits))
+		return -ENODEV;
+
+	if (!(list = kmalloc(sizeof(struct evdev_list), GFP_KERNEL)))
+		return -ENOMEM;
+
+	memset(list, 0, sizeof(struct evdev_list));
+
+	list->evdev = evdev_base[i];
+	list->next = evdev_base[i]->list;
+	evdev_base[i]->list = list;
+
+	file->private_data = list;
+
+	list->evdev->used++;
+
+	MOD_INC_USE_COUNT;
+	return 0;
+}
+
+static ssize_t evdev_write(struct file * file, const char * buffer, size_t count, loff_t *ppos)
+{
+	return -EINVAL;
+}
+
+static ssize_t evdev_read(struct file * file, char * buffer, size_t count, loff_t *ppos)
+{
+	DECLARE_WAITQUEUE(wait, current);
+	struct evdev_list *list = file->private_data;
+	int retval = 0;
+
+	if (list->head == list->tail) {
+
+		add_wait_queue(&list->evdev->wait, &wait);
+		current->state = TASK_INTERRUPTIBLE;
+
+		while (list->head == list->tail) {
+
+			if (file->f_flags & O_NONBLOCK) {
+				retval = -EAGAIN;
+				break;
+			}
+			if (signal_pending(current)) {
+				retval = -ERESTARTSYS;
+				break;
+			}
+
+			schedule();
+		}
+
+		current->state = TASK_RUNNING;
+		remove_wait_queue(&list->evdev->wait, &wait);
+	}
+
+	if (retval)
+		return retval;
+
+	while (list->head != list->tail && retval + sizeof(struct input_event) <= count) {
+		if (copy_to_user(buffer + retval, list->buffer + list->tail,
+			 sizeof(struct input_event))) return -EFAULT;
+		list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
+		retval += sizeof(struct input_event);
+	}
+
+	return retval;	
+}
+
+static unsigned int evdev_poll(struct file *file, poll_table *wait)
+{
+	struct evdev_list *list = file->private_data;
+	poll_wait(file, &list->evdev->wait, wait);
+	if (list->head != list->tail)
+		return POLLIN | POLLRDNORM;
+	return 0;
+}
+
+static struct file_operations evdev_fops = {
+	read:		evdev_read,
+	write:		evdev_write,
+	poll:		evdev_poll,
+	open:		evdev_open,
+	release:	evdev_release,
+	fasync:		evdev_fasync,
+};
+
+static int evdev_connect(struct input_handler *handler, struct input_dev *dev)
+{
+	struct evdev *evdev;
+
+	if (!(evdev = kmalloc(sizeof(struct evdev), GFP_KERNEL)))
+		return -1;
+
+	memset(evdev, 0, sizeof(struct evdev));
+
+	init_waitqueue_head(&evdev->wait);
+
+	evdev->misc.minor = ffz(evdev_miscbits);
+	set_bit(evdev->misc.minor, &evdev_miscbits);
+	evdev_base[evdev->misc.minor] = evdev;
+
+	sprintf(evdev->name, "evdev%d", evdev->misc.minor);
+	evdev->misc.name = evdev->name;
+	evdev->misc.minor += EVDEV_MINOR_BASE;
+	evdev->misc.fops = &evdev_fops;
+
+	evdev->handle.dev = dev;
+	evdev->handle.handler = handler;
+	evdev->handle.private = evdev;
+
+	evdev->used = 1;
+
+	misc_register(&evdev->misc);
+	input_open_device(&evdev->handle);
+
+	printk("%s: Event device for input%d on misc%d - /dev/input%d\n",
+		evdev->name, dev->number, evdev->misc.minor, evdev->misc.minor - EVDEV_MINOR_BASE);
+
+	return 0;
+}
+
+static void evdev_disconnect(struct input_handle *handle)
+{
+	struct evdev *evdev = handle->private;
+
+	input_close_device(handle);
+
+	if (!--evdev->used) {
+		clear_bit(evdev->misc.minor - EVDEV_MINOR_BASE, &evdev_miscbits);
+		misc_deregister(&evdev->misc);
+		kfree(evdev);
+	}
+}
+	
+static struct input_handler evdev_handler = {
+	event:		evdev_event,
+	connect:	evdev_connect,
+	disconnect:	evdev_disconnect,
+};
+
+#ifdef MODULE
+int init_module(void)
+#else
+int __init evdev_init(void)
+#endif
+{
+	input_register_handler(&evdev_handler);
+
+	return 0;
+}
+
+#ifdef MODULE
+void cleanup_module(void)
+{
+	input_unregister_handler(&evdev_handler);
+}
+#endif