patch-2.2.18 linux/drivers/usb/evdev.c

• Lines: 357
• Date: Fri Sep 22 14:56:09 2000
• Orig file: v2.2.17/drivers/usb/evdev.c
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/drivers/usb/evdev.c linux/drivers/usb/evdev.c
@@ -0,0 +1,356 @@
+/*
+ * $Id: evdev.c,v 1.10 2000/06/23 09:23:00 vojtech Exp $
+ *
+ *  Copyright (c) 1999-2000 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 <vojtech@suse.cz>, or by paper mail:
+ * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic
+ */
+
+#define EVDEV_MINOR_BASE	64
+#define EVDEV_MINORS		32
+#define EVDEV_BUFFER_SIZE	64
+
+#include <linux/poll.h>
+#include <linux/malloc.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/smp_lock.h>
+#include <linux/kcomp.h>
+
+struct evdev {
+	int exist;
+	int open;
+	int minor;
+	struct input_handle handle;
+	wait_queue_head_t wait;
+	devfs_handle_t devfs;
+	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 struct evdev *evdev_table[EVDEV_MINORS] = { NULL, /* ... */ };
+
+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);
+		
+		kill_fasync(list->fasync, SIGIO);
+
+		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;
+
+	lock_kernel();
+	listptr = &list->evdev->list;
+	evdev_fasync(-1, file, 0);
+
+	while (*listptr && (*listptr != list))
+		listptr = &((*listptr)->next);
+	*listptr = (*listptr)->next;
+
+	if (!--list->evdev->open) {
+		if (list->evdev->exist) {
+			input_close_device(&list->evdev->handle);	
+		} else {
+			input_unregister_minor(list->evdev->devfs);
+			evdev_table[list->evdev->minor] = NULL;
+			kfree(list->evdev);
+		}
+	}
+
+	kfree(list);
+	unlock_kernel();
+
+	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 > EVDEV_MINORS || !evdev_table[i])
+		return -ENODEV;
+
+	if (!(list = kmalloc(sizeof(struct evdev_list), GFP_KERNEL)))
+		return -ENOMEM;
+	memset(list, 0, sizeof(struct evdev_list));
+
+	list->evdev = evdev_table[i];
+	list->next = evdev_table[i]->list;
+	evdev_table[i]->list = list;
+
+	file->private_data = list;
+
+	if (!list->evdev->open++)
+		if (list->evdev->exist)
+			input_open_device(&list->evdev->handle);	
+
+	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;	
+}
+
+/* No kernel lock - fine */
+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 int evdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+	struct evdev_list *list = file->private_data;
+	struct evdev *evdev = list->evdev;
+	struct input_dev *dev = evdev->handle.dev;
+	int retval;
+
+	switch (cmd) {
+
+		case EVIOCGVERSION:
+			return put_user(EV_VERSION, (int *) arg);
+
+		case EVIOCGID:
+			if ((retval = put_user(dev->idbus,     ((short *) arg) + 0))) return retval;
+			if ((retval = put_user(dev->idvendor,  ((short *) arg) + 1))) return retval;
+			if ((retval = put_user(dev->idproduct, ((short *) arg) + 2))) return retval;
+			if ((retval = put_user(dev->idversion, ((short *) arg) + 3))) return retval;
+			return 0;
+
+		default:
+
+			if (_IOC_TYPE(cmd) != 'E' || _IOC_DIR(cmd) != _IOC_READ)
+				return -EINVAL;
+
+			if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
+
+				long *bits;
+				int len;
+
+				switch (_IOC_NR(cmd) & EV_MAX) {
+					case      0: bits = dev->evbit;  len = EV_MAX;  break;
+					case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
+					case EV_REL: bits = dev->relbit; len = REL_MAX; break;
+					case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
+					case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
+					case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
+					default: return -EINVAL;
+				}
+				len = NBITS(len) * sizeof(long);
+				if (len > _IOC_SIZE(cmd)) {
+					printk(KERN_WARNING "evdev.c: Truncating bitfield length from %d to %d\n",
+						len, _IOC_SIZE(cmd));
+					len = _IOC_SIZE(cmd);
+				}
+				return copy_to_user((char *) arg, bits, len) ? -EFAULT : len;
+			}
+
+			if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) {
+				int len;
+				if (!dev->name) return 0;
+				len = strlen(dev->name) + 1;
+				if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
+				return copy_to_user((char *) arg, dev->name, len) ? -EFAULT : len;
+			}
+
+			if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
+
+				int t = _IOC_NR(cmd) & ABS_MAX;
+
+				if ((retval = put_user(dev->abs[t],     ((int *) arg) + 0))) return retval;
+				if ((retval = put_user(dev->absmin[t],  ((int *) arg) + 1))) return retval;
+				if ((retval = put_user(dev->absmax[t],  ((int *) arg) + 2))) return retval;
+				if ((retval = put_user(dev->absfuzz[t], ((int *) arg) + 3))) return retval;
+				if ((retval = put_user(dev->absflat[t], ((int *) arg) + 4))) return retval;
+
+				return 0;
+			}
+	}
+	return -EINVAL;
+}
+
+static struct file_operations evdev_fops = {
+	read:		evdev_read,
+	write:		evdev_write,
+	poll:		evdev_poll,
+	open:		evdev_open,
+	release:	evdev_release,
+	ioctl:		evdev_ioctl,
+	fasync:		evdev_fasync,
+};
+
+static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev)
+{
+	struct evdev *evdev;
+	int minor;
+
+	for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++);
+	if (evdev_table[minor]) {
+		printk(KERN_ERR "evdev: no more free evdev devices\n");
+		return NULL;
+	}
+
+	if (!(evdev = kmalloc(sizeof(struct evdev), GFP_KERNEL)))
+		return NULL;
+	memset(evdev, 0, sizeof(struct evdev));
+
+	init_waitqueue_head(&evdev->wait);
+
+	evdev->minor = minor;
+	evdev_table[minor] = evdev;
+
+	evdev->handle.dev = dev;
+	evdev->handle.handler = handler;
+	evdev->handle.private = evdev;
+
+	evdev->exist = 1;
+
+	evdev->devfs = input_register_minor("event%d", minor, EVDEV_MINOR_BASE);
+
+	printk(KERN_INFO "event%d: Event device for input%d\n", minor, dev->number);
+
+	return &evdev->handle;
+}
+
+static void evdev_disconnect(struct input_handle *handle)
+{
+	struct evdev *evdev = handle->private;
+
+	evdev->exist = 0;
+
+	if (evdev->open) {
+		input_close_device(handle);
+	} else {
+		input_unregister_minor(evdev->devfs);
+		evdev_table[evdev->minor] = NULL;
+		kfree(evdev);
+	}
+}
+	
+static struct input_handler evdev_handler = {
+	event:		evdev_event,
+	connect:	evdev_connect,
+	disconnect:	evdev_disconnect,
+	fops:		&evdev_fops,
+	minor:		EVDEV_MINOR_BASE,
+};
+
+static int __init evdev_init(void)
+{
+	input_register_handler(&evdev_handler);
+	return 0;
+}
+
+static void __exit evdev_exit(void)
+{
+	input_unregister_handler(&evdev_handler);
+}
+
+module_init(evdev_init);
+module_exit(evdev_exit);
+
+MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
+MODULE_DESCRIPTION("Event character device driver");