Viewing file:  mousedev.c (12.77 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* $Id: mousedev.c,v 1.24 2000/11/15 10:57:45 vojtech Exp $
*
* Copyright (c) 1999-2000 Vojtech Pavlik
*
* Input driver to ImExPS/2 device driver module.
*
* 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 MOUSEDEV_MINOR_BASE 32
#define MOUSEDEV_MINORS 32
#define MOUSEDEV_MIX 31
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/config.h>
#include <linux/smp_lock.h>
#include <linux/random.h>
#ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X
#define CONFIG_INPUT_MOUSEDEV_SCREEN_X 1024
#endif
#ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y
#define CONFIG_INPUT_MOUSEDEV_SCREEN_Y 768
#endif
struct mousedev {
int exist;
int open;
int minor;
wait_queue_head_t wait;
struct mousedev_list *list;
struct input_handle handle;
devfs_handle_t devfs;
};
struct mousedev_list {
struct fasync_struct *fasync;
struct mousedev *mousedev;
struct mousedev_list *next;
int dx, dy, dz, oldx, oldy;
signed char ps2[6];
unsigned long buttons;
unsigned char ready, buffer, bufsiz;
unsigned char mode, imexseq, impsseq;
};
#define MOUSEDEV_SEQ_LEN 6
static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
static struct input_handler mousedev_handler;
static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
static struct mousedev mousedev_mix;
static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X;
static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;
static void mousedev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
{
struct mousedev *mousedevs[3] = { handle->private, &mousedev_mix, NULL };
struct mousedev **mousedev = mousedevs;
struct mousedev_list *list;
int index, size;
add_mouse_randomness((type << 4) ^ code ^ (code >> 4) ^ value);
while (*mousedev) {
list = (*mousedev)->list;
while (list) {
switch (type) {
case EV_ABS:
if (test_bit(BTN_TRIGGER, handle->dev->keybit))
break;
switch (code) {
case ABS_X:
size = handle->dev->absmax[ABS_X] - handle->dev->absmin[ABS_X];
list->dx += (value * xres - list->oldx) / size;
list->oldx += list->dx * size;
break;
case ABS_Y:
size = handle->dev->absmax[ABS_Y] - handle->dev->absmin[ABS_Y];
list->dy -= (value * yres - list->oldy) / size;
list->oldy -= list->dy * size;
break;
}
break;
case EV_REL:
switch (code) {
case REL_X: list->dx += value; break;
case REL_Y: list->dy -= value; break;
case REL_WHEEL: if (list->mode) list->dz -= value; break;
}
break;
case EV_KEY:
switch (code) {
case BTN_0:
case BTN_TOUCH:
case BTN_LEFT: index = 0; break;
case BTN_4:
case BTN_EXTRA: if (list->mode == 2) { index = 4; break; }
case BTN_STYLUS:
case BTN_1:
case BTN_RIGHT: index = 1; break;
case BTN_3:
case BTN_SIDE: if (list->mode == 2) { index = 3; break; }
case BTN_2:
case BTN_STYLUS2:
case BTN_MIDDLE: index = 2; break;
default: return;
}
switch (value) {
case 0: clear_bit(index, &list->buttons); break;
case 1: set_bit(index, &list->buttons); break;
case 2: return;
}
break;
}
list->ready = 1;
kill_fasync(&list->fasync, SIGIO, POLL_IN);
list = list->next;
}
wake_up_interruptible(&((*mousedev)->wait));
mousedev++;
}
}
static int mousedev_fasync(int fd, struct file *file, int on)
{
int retval;
struct mousedev_list *list = file->private_data;
retval = fasync_helper(fd, file, on, &list->fasync);
return retval < 0 ? retval : 0;
}
static int mousedev_release(struct inode * inode, struct file * file)
{
struct mousedev_list *list = file->private_data;
struct mousedev_list **listptr;
lock_kernel();
listptr = &list->mousedev->list;
mousedev_fasync(-1, file, 0);
while (*listptr && (*listptr != list))
listptr = &((*listptr)->next);
*listptr = (*listptr)->next;
if (!--list->mousedev->open) {
if (list->mousedev->minor == MOUSEDEV_MIX) {
struct input_handle *handle = mousedev_handler.handle;
while (handle) {
struct mousedev *mousedev = handle->private;
if (!mousedev->open) {
if (mousedev->exist) {
input_close_device(&mousedev->handle);
} else {
input_unregister_minor(mousedev->devfs);
mousedev_table[mousedev->minor] = NULL;
kfree(mousedev);
}
}
handle = handle->hnext;
}
} else {
if (!mousedev_mix.open) {
if (list->mousedev->exist) {
input_close_device(&list->mousedev->handle);
} else {
input_unregister_minor(list->mousedev->devfs);
mousedev_table[list->mousedev->minor] = NULL;
kfree(list->mousedev);
}
}
}
}
kfree(list);
unlock_kernel();
return 0;
}
static int mousedev_open(struct inode * inode, struct file * file)
{
struct mousedev_list *list;
int i = MINOR(inode->i_rdev) - MOUSEDEV_MINOR_BASE;
if (i >= MOUSEDEV_MINORS || !mousedev_table[i])
return -ENODEV;
if (!(list = kmalloc(sizeof(struct mousedev_list), GFP_KERNEL)))
return -ENOMEM;
memset(list, 0, sizeof(struct mousedev_list));
list->mousedev = mousedev_table[i];
list->next = mousedev_table[i]->list;
mousedev_table[i]->list = list;
file->private_data = list;
if (!list->mousedev->open++) {
if (list->mousedev->minor == MOUSEDEV_MIX) {
struct input_handle *handle = mousedev_handler.handle;
while (handle) {
struct mousedev *mousedev = handle->private;
if (!mousedev->open)
if (mousedev->exist)
input_open_device(handle);
handle = handle->hnext;
}
} else {
if (!mousedev_mix.open)
if (list->mousedev->exist)
input_open_device(&list->mousedev->handle);
}
}
return 0;
}
static void mousedev_packet(struct mousedev_list *list, unsigned char off)
{
list->ps2[off] = 0x08 | ((list->dx < 0) << 4) | ((list->dy < 0) << 5) | (list->buttons & 0x07);
list->ps2[off + 1] = (list->dx > 127 ? 127 : (list->dx < -127 ? -127 : list->dx));
list->ps2[off + 2] = (list->dy > 127 ? 127 : (list->dy < -127 ? -127 : list->dy));
list->dx -= list->ps2[off + 1];
list->dy -= list->ps2[off + 2];
list->bufsiz = off + 3;
if (list->mode == 2) {
list->ps2[off + 3] = (list->dz > 7 ? 7 : (list->dz < -7 ? -7 : list->dz));
list->dz -= list->ps2[off + 3];
list->ps2[off + 3] = (list->ps2[off + 3] & 0x0f) | ((list->buttons & 0x18) << 1);
list->bufsiz++;
}
if (list->mode == 1) {
list->ps2[off + 3] = (list->dz > 127 ? 127 : (list->dz < -127 ? -127 : list->dz));
list->dz -= list->ps2[off + 3];
list->bufsiz++;
}
if (!list->dx && !list->dy && (!list->mode || !list->dz)) list->ready = 0;
list->buffer = list->bufsiz;
}
static ssize_t mousedev_write(struct file * file, const char * buffer, size_t count, loff_t *ppos)
{
struct mousedev_list *list = file->private_data;
unsigned char c;
int i;
for (i = 0; i < count; i++) {
if (get_user(c, buffer + i))
return -EFAULT;
if (c == mousedev_imex_seq[list->imexseq]) {
if (++list->imexseq == MOUSEDEV_SEQ_LEN) {
list->imexseq = 0;
list->mode = 2;
}
} else list->imexseq = 0;
if (c == mousedev_imps_seq[list->impsseq]) {
if (++list->impsseq == MOUSEDEV_SEQ_LEN) {
list->impsseq = 0;
list->mode = 1;
}
} else list->impsseq = 0;
list->ps2[0] = 0xfa;
list->bufsiz = 1;
list->ready = 1;
switch (c) {
case 0xeb: /* Poll */
mousedev_packet(list, 1);
break;
case 0xf2: /* Get ID */
switch (list->mode) {
case 0: list->ps2[1] = 0; break;
case 1: list->ps2[1] = 3; break;
case 2: list->ps2[1] = 4; break;
}
list->bufsiz = 2;
break;
case 0xe9: /* Get info */
list->ps2[1] = 0x60; list->ps2[2] = 3; list->ps2[3] = 200;
list->bufsiz = 4;
break;
}
list->buffer = list->bufsiz;
}
kill_fasync(&list->fasync, SIGIO, POLL_IN);
wake_up_interruptible(&list->mousedev->wait);
return count;
}
static ssize_t mousedev_read(struct file * file, char * buffer, size_t count, loff_t *ppos)
{
DECLARE_WAITQUEUE(wait, current);
struct mousedev_list *list = file->private_data;
int retval = 0;
if (!list->ready && !list->buffer) {
add_wait_queue(&list->mousedev->wait, &wait);
current->state = TASK_INTERRUPTIBLE;
while (!list->ready) {
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->mousedev->wait, &wait);
}
if (retval)
return retval;
if (!list->buffer)
mousedev_packet(list, 0);
if (count > list->buffer)
count = list->buffer;
if (copy_to_user(buffer, list->ps2 + list->bufsiz - list->buffer, count))
return -EFAULT;
list->buffer -= count;
return count;
}
/* No kernel lock - fine */
static unsigned int mousedev_poll(struct file *file, poll_table *wait)
{
struct mousedev_list *list = file->private_data;
poll_wait(file, &list->mousedev->wait, wait);
if (list->ready || list->buffer)
return POLLIN | POLLRDNORM;
return 0;
}
struct file_operations mousedev_fops = {
owner: THIS_MODULE,
read: mousedev_read,
write: mousedev_write,
poll: mousedev_poll,
open: mousedev_open,
release: mousedev_release,
fasync: mousedev_fasync,
};
static struct input_handle *mousedev_connect(struct input_handler *handler, struct input_dev *dev)
{
struct mousedev *mousedev;
int minor = 0;
if (!test_bit(EV_KEY, dev->evbit) ||
(!test_bit(BTN_LEFT, dev->keybit) && !test_bit(BTN_TOUCH, dev->keybit)))
return NULL;
if ((!test_bit(EV_REL, dev->evbit) || !test_bit(REL_X, dev->relbit)) &&
(!test_bit(EV_ABS, dev->evbit) || !test_bit(ABS_X, dev->absbit)))
return NULL;
for (minor = 0; minor < MOUSEDEV_MINORS && mousedev_table[minor]; minor++);
if (minor == MOUSEDEV_MINORS) {
printk(KERN_ERR "mousedev: no more free mousedev devices\n");
return NULL;
}
if (!(mousedev = kmalloc(sizeof(struct mousedev), GFP_KERNEL)))
return NULL;
memset(mousedev, 0, sizeof(struct mousedev));
init_waitqueue_head(&mousedev->wait);
mousedev->exist = 1;
mousedev->minor = minor;
mousedev_table[minor] = mousedev;
mousedev->handle.dev = dev;
mousedev->handle.handler = handler;
mousedev->handle.private = mousedev;
mousedev->devfs = input_register_minor("mouse%d", minor, MOUSEDEV_MINOR_BASE);
if (mousedev_mix.open)
input_open_device(&mousedev->handle);
// printk(KERN_INFO "mouse%d: PS/2 mouse device for input%d\n", minor, dev->number);
return &mousedev->handle;
}
static void mousedev_disconnect(struct input_handle *handle)
{
struct mousedev *mousedev = handle->private;
mousedev->exist = 0;
if (mousedev->open) {
input_close_device(handle);
} else {
if (mousedev_mix.open)
input_close_device(handle);
input_unregister_minor(mousedev->devfs);
mousedev_table[mousedev->minor] = NULL;
kfree(mousedev);
}
}
static struct input_handler mousedev_handler = {
event: mousedev_event,
connect: mousedev_connect,
disconnect: mousedev_disconnect,
fops: &mousedev_fops,
minor: MOUSEDEV_MINOR_BASE,
};
static int __init mousedev_init(void)
{
input_register_handler(&mousedev_handler);
memset(&mousedev_mix, 0, sizeof(struct mousedev));
init_waitqueue_head(&mousedev_mix.wait);
mousedev_table[MOUSEDEV_MIX] = &mousedev_mix;
mousedev_mix.exist = 1;
mousedev_mix.minor = MOUSEDEV_MIX;
mousedev_mix.devfs = input_register_minor("mice", MOUSEDEV_MIX, MOUSEDEV_MINOR_BASE);
printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");
return 0;
}
static void __exit mousedev_exit(void)
{
input_unregister_minor(mousedev_mix.devfs);
input_unregister_handler(&mousedev_handler);
}
module_init(mousedev_init);
module_exit(mousedev_exit);
MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
MODULE_DESCRIPTION("Input driver to PS/2 or ImPS/2 device driver");
MODULE_LICENSE("GPL");
MODULE_PARM(xres, "i");
MODULE_PARM_DESC(xres, "Horizontal screen resolution");
MODULE_PARM(yres, "i");
MODULE_PARM_DESC(yres, "Vertical screen resolution");
|