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

• Lines: 497
• Date: Fri Sep 22 14:56:09 2000
• Orig file: v2.2.17/drivers/usb/joydev.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/joydev.c linux/drivers/usb/joydev.c
@@ -0,0 +1,496 @@
+/*
+ * $Id: joydev.c,v 1.13 2000/08/14 21:05:26 vojtech Exp $
+ *
+ *  Copyright (c) 1999-2000 Vojtech Pavlik 
+ *  Copyright (c) 1999 Colin Van Dyke 
+ *
+ *  Joystick device driver for the input driver suite.
+ *
+ *  Sponsored by SuSE and Intel
+ */
+
+/*
+ * 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
+ */
+
+#include <asm/io.h>
+#include <asm/system.h>
+#include <asm/segment.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/joystick.h>
+#include <linux/input.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/malloc.h>
+#include <linux/mm.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/poll.h>
+#include <linux/init.h>
+#include <linux/smp_lock.h>
+
+#define JOYDEV_MINOR_BASE	0
+#define JOYDEV_MINORS		32
+#define JOYDEV_BUFFER_SIZE	64
+
+struct joydev {
+	int exist;
+	int open;
+	int minor;
+	struct input_handle handle;
+	wait_queue_head_t wait;
+	devfs_handle_t devfs;
+	struct joydev *next;
+	struct joydev_list *list;
+	struct js_corr corr[ABS_MAX];
+	struct JS_DATA_SAVE_TYPE glue;
+	int nabs;
+	int nkey;
+	__u16 keymap[KEY_MAX - BTN_MISC];
+	__u16 keypam[KEY_MAX - BTN_MISC];
+	__u8 absmap[ABS_MAX];
+	__u8 abspam[ABS_MAX];
+	__s16 abs[ABS_MAX];
+};
+
+struct joydev_list {
+	struct js_event buffer[JOYDEV_BUFFER_SIZE];
+	int head;
+	int tail;
+	int startup;
+	struct fasync_struct *fasync;
+	struct joydev *joydev;
+	struct joydev_list *next;
+};
+
+static struct joydev *joydev_table[JOYDEV_MINORS];
+
+MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
+MODULE_DESCRIPTION("Joystick device driver");
+MODULE_SUPPORTED_DEVICE("input/js");
+
+static int joydev_correct(int value, struct js_corr *corr)
+{
+	switch (corr->type) {
+		case JS_CORR_NONE:
+			break;
+		case JS_CORR_BROKEN:
+			value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
+				((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
+				((corr->coef[2] * (value - corr->coef[0])) >> 14);
+			break;
+		default:
+			return 0;
+	}
+
+	if (value < -32767) return -32767;
+	if (value >  32767) return  32767;
+
+	return value;
+}
+
+static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
+{
+	struct joydev *joydev = handle->private;
+	struct joydev_list *list = joydev->list;
+	struct js_event event;
+
+	switch (type) {
+
+		case EV_KEY:
+			if (code < BTN_MISC || value == 2) return;
+			event.type = JS_EVENT_BUTTON;
+			event.number = joydev->keymap[code - BTN_MISC];
+			event.value = value;
+			break;
+
+		case EV_ABS:
+			event.type = JS_EVENT_AXIS;
+			event.number = joydev->absmap[code];
+			event.value = joydev_correct(value, joydev->corr + event.number);
+			if (event.value == joydev->abs[event.number]) return;
+			joydev->abs[event.number] = event.value;
+			break;
+
+		default:
+			return;
+	}  
+
+	event.time = jiffies * (1000 / HZ);
+
+	while (list) {
+
+		memcpy(list->buffer + list->head, &event, sizeof(struct js_event));
+
+		if (list->startup == joydev->nabs + joydev->nkey)
+			if (list->tail == (list->head = (list->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
+				list->startup = 0;
+
+		kill_fasync(list->fasync, SIGIO);
+
+		list = list->next;
+	}
+
+	wake_up_interruptible(&joydev->wait);
+}
+
+static int joydev_fasync(int fd, struct file *file, int on)
+{
+	int retval;
+	struct joydev_list *list = file->private_data;
+	retval = fasync_helper(fd, file, on, &list->fasync);
+	return retval < 0 ? retval : 0;
+}
+
+static int joydev_release(struct inode * inode, struct file * file)
+{
+	struct joydev_list *list = file->private_data;
+	struct joydev_list **listptr;
+
+	lock_kernel();
+	listptr = &list->joydev->list;
+	joydev_fasync(-1, file, 0);
+
+	while (*listptr && (*listptr != list))
+		listptr = &((*listptr)->next);
+	*listptr = (*listptr)->next;
+
+	if (!--list->joydev->open) {
+		if (list->joydev->exist) {
+			input_close_device(&list->joydev->handle);
+		} else {
+			input_unregister_minor(list->joydev->devfs);
+			joydev_table[list->joydev->minor] = NULL;
+			kfree(list->joydev);
+		}
+	}
+
+	kfree(list);
+	unlock_kernel();
+
+	return 0;
+}
+
+static int joydev_open(struct inode *inode, struct file *file)
+{
+	struct joydev_list *list;
+	int i = MINOR(inode->i_rdev) - JOYDEV_MINOR_BASE;
+
+	if (i > JOYDEV_MINORS || !joydev_table[i])
+		return -ENODEV;
+
+	if (!(list = kmalloc(sizeof(struct joydev_list), GFP_KERNEL)))
+		return -ENOMEM;
+	memset(list, 0, sizeof(struct joydev_list));
+
+	list->joydev = joydev_table[i];
+	list->next = joydev_table[i]->list;
+	joydev_table[i]->list = list;	
+
+	file->private_data = list;
+
+	if (!list->joydev->open++)
+		if (list->joydev->exist)
+			input_open_device(&list->joydev->handle);
+
+	return 0;
+}
+
+static ssize_t joydev_write(struct file * file, const char * buffer, size_t count, loff_t *ppos)
+{
+	return -EINVAL;
+}
+
+static ssize_t joydev_read(struct file *file, char *buf, size_t count, loff_t *ppos)
+{
+	DECLARE_WAITQUEUE(wait, current);
+	struct joydev_list *list = file->private_data;
+	struct joydev *joydev = list->joydev;
+	struct input_dev *input = joydev->handle.dev;
+	int retval = 0;
+
+	if (count < sizeof(struct js_event))
+		return -EINVAL;
+
+	if (count == sizeof(struct JS_DATA_TYPE)) {
+
+		struct JS_DATA_TYPE data;
+
+		data.buttons =  ((joydev->nkey > 0 && test_bit(joydev->keypam[0], input->key)) ? 1 : 0) |
+				((joydev->nkey > 1 && test_bit(joydev->keypam[1], input->key)) ? 2 : 0);
+		data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
+		data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
+
+		if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
+			return -EFAULT;
+
+		list->startup = 0;
+		list->tail = list->head;
+
+		return sizeof(struct JS_DATA_TYPE);
+	}
+
+	if (list->head == list->tail && list->startup == joydev->nabs + joydev->nkey) {
+
+		add_wait_queue(&list->joydev->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->joydev->wait, &wait);
+	}
+
+	if (retval)
+		return retval;
+
+	while (list->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) {
+
+		struct js_event event;
+
+		event.time = jiffies * (1000/HZ);
+
+		if (list->startup < joydev->nkey) {
+			event.type = JS_EVENT_BUTTON | JS_EVENT_INIT;
+			event.number = list->startup;
+			event.value = !!test_bit(joydev->keypam[event.number], input->key);
+		} else {
+			event.type = JS_EVENT_AXIS | JS_EVENT_INIT;
+			event.number = list->startup - joydev->nkey;
+			event.value = joydev->abs[event.number];
+		}
+
+		if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
+			return -EFAULT;
+
+		list->startup++;
+		retval += sizeof(struct js_event);
+	}
+
+	while (list->head != list->tail && retval + sizeof(struct js_event) <= count) {
+
+		if (copy_to_user(buf + retval, list->buffer + list->tail, sizeof(struct js_event)))
+			return -EFAULT;
+
+		list->tail = (list->tail + 1) & (JOYDEV_BUFFER_SIZE - 1);
+		retval += sizeof(struct js_event);
+	}
+
+	return retval;
+}
+
+/* No kernel lock - fine */
+static unsigned int joydev_poll(struct file *file, poll_table *wait)
+{
+	struct joydev_list *list = file->private_data;
+	poll_wait(file, &list->joydev->wait, wait);
+	if (list->head != list->tail || list->startup < list->joydev->nabs + list->joydev->nkey)
+		return POLLIN | POLLRDNORM;
+	return 0;
+}
+
+static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+	struct joydev_list *list = file->private_data;
+	struct joydev *joydev = list->joydev;
+	struct input_dev *dev = joydev->handle.dev;
+
+
+	switch (cmd) {
+
+		case JS_SET_CAL:
+			return copy_from_user(&joydev->glue.JS_CORR, (struct JS_DATA_TYPE *) arg,
+				sizeof(struct JS_DATA_TYPE)) ? -EFAULT : 0;
+		case JS_GET_CAL:
+			return copy_to_user((struct JS_DATA_TYPE *) arg, &joydev->glue.JS_CORR,
+				sizeof(struct JS_DATA_TYPE)) ? -EFAULT : 0;
+		case JS_SET_TIMEOUT:
+			return get_user(joydev->glue.JS_TIMEOUT, (int *) arg);
+		case JS_GET_TIMEOUT:
+			return put_user(joydev->glue.JS_TIMEOUT, (int *) arg);
+		case JS_SET_TIMELIMIT:
+			return get_user(joydev->glue.JS_TIMELIMIT, (long *) arg);
+		case JS_GET_TIMELIMIT:
+			return put_user(joydev->glue.JS_TIMELIMIT, (long *) arg);
+		case JS_SET_ALL:
+			return copy_from_user(&joydev->glue, (struct JS_DATA_SAVE_TYPE *) arg,
+						sizeof(struct JS_DATA_SAVE_TYPE)) ? -EFAULT : 0;
+		case JS_GET_ALL:
+			return copy_to_user((struct JS_DATA_SAVE_TYPE *) arg, &joydev->glue,
+						sizeof(struct JS_DATA_SAVE_TYPE)) ? -EFAULT : 0;
+
+		case JSIOCGVERSION:
+			return put_user(JS_VERSION, (__u32 *) arg);
+		case JSIOCGAXES:
+			return put_user(joydev->nabs, (__u8 *) arg);
+		case JSIOCGBUTTONS:
+			return put_user(joydev->nkey, (__u8 *) arg);
+		case JSIOCSCORR:
+			return copy_from_user(joydev->corr, (struct js_corr *) arg,
+						sizeof(struct js_corr) * joydev->nabs) ? -EFAULT : 0;
+		case JSIOCGCORR:
+			return copy_to_user((struct js_corr *) arg, joydev->corr,
+						sizeof(struct js_corr) * joydev->nabs) ? -EFAULT : 0;
+		default:
+			if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
+				int len;
+				if (!dev->name) return 0;
+				len = strlen(dev->name) + 1;
+				if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
+				if (copy_to_user((char *) arg, dev->name, len)) return -EFAULT;
+				return len;
+			}
+	}
+	return -EINVAL;
+}
+
+static struct file_operations joydev_fops = {
+	read:		joydev_read,
+	write:		joydev_write,
+	poll:		joydev_poll,
+	open:		joydev_open,
+	release:	joydev_release,
+	ioctl:		joydev_ioctl,
+	fasync:		joydev_fasync,
+};
+
+static struct input_handle *joydev_connect(struct input_handler *handler, struct input_dev *dev)
+{
+	struct joydev *joydev;
+	int i, j, minor;
+
+	if (!(test_bit(EV_KEY, dev->evbit) && test_bit(EV_ABS, dev->evbit) &&
+	     (test_bit(ABS_X, dev->absbit) || test_bit(ABS_Y, dev->absbit)) &&
+	     (test_bit(BTN_TRIGGER, dev->keybit) || test_bit(BTN_A, dev->keybit)
+		|| test_bit(BTN_1, dev->keybit)))) return NULL; 
+
+	for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++);
+	if (joydev_table[minor]) {
+		printk(KERN_ERR "joydev: no more free joydev devices\n");
+		return NULL;
+	}
+
+	if (!(joydev = kmalloc(sizeof(struct joydev), GFP_KERNEL)))
+		return NULL;
+	memset(joydev, 0, sizeof(struct joydev));
+
+	init_waitqueue_head(&joydev->wait);
+
+	joydev->minor = minor;
+	joydev_table[minor] = joydev;
+
+	joydev->handle.dev = dev;
+	joydev->handle.handler = handler;
+	joydev->handle.private = joydev;
+
+	joydev->exist = 1;
+
+	for (i = 0; i < ABS_MAX; i++)
+		if (test_bit(i, dev->absbit)) {
+			joydev->absmap[i] = joydev->nabs;
+			joydev->abspam[joydev->nabs] = i;
+			joydev->nabs++;
+		}
+
+	for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC; i++)
+		if (test_bit(i + BTN_MISC, dev->keybit)) {
+			joydev->keymap[i] = joydev->nkey;
+			joydev->keypam[joydev->nkey] = i + BTN_MISC;
+			joydev->nkey++;
+		}
+
+	for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
+		if (test_bit(i + BTN_MISC, dev->keybit)) {
+			joydev->keymap[i] = joydev->nkey;
+			joydev->keypam[joydev->nkey] = i + BTN_MISC;
+			joydev->nkey++;
+		}
+
+	for (i = 0; i < joydev->nabs; i++) {
+		j = joydev->abspam[i];
+		if (dev->absmax[j] == dev->absmin[j]) {
+			joydev->corr[i].type = JS_CORR_NONE;
+			continue;
+		}
+		joydev->corr[i].type = JS_CORR_BROKEN;
+		joydev->corr[i].prec = dev->absfuzz[j];
+		joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
+		joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
+		joydev->corr[i].coef[2] = (1 << 29) / ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j]);
+		joydev->corr[i].coef[3] = (1 << 29) / ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j]);
+
+		joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
+	}
+
+	joydev->devfs = input_register_minor("js%d", minor, JOYDEV_MINOR_BASE);
+
+	printk(KERN_INFO "js%d: Joystick device for input%d\n", minor, dev->number);
+
+	return &joydev->handle;
+}
+
+static void joydev_disconnect(struct input_handle *handle)
+{
+	struct joydev *joydev = handle->private;
+
+	joydev->exist = 0;
+
+	if (joydev->open) {
+		input_close_device(handle);	
+	} else {
+		input_unregister_minor(joydev->devfs);
+		joydev_table[joydev->minor] = NULL;
+		kfree(joydev);
+	}
+}
+
+static struct input_handler joydev_handler = {
+	event:		joydev_event,
+	connect:	joydev_connect,
+	disconnect:	joydev_disconnect,
+	fops:		&joydev_fops,
+	minor:		JOYDEV_MINOR_BASE,
+};
+
+static int __init joydev_init(void)
+{
+	input_register_handler(&joydev_handler);
+	return 0;
+}
+
+static void __exit joydev_exit(void)
+{
+	input_unregister_handler(&joydev_handler);
+}
+
+module_init(joydev_init);
+module_exit(joydev_exit);