mousedev.c
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- /*
- * $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 devicesn");
- 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%dn", 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 micen");
- 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");