/*
* Input driver to ExplorerPS/2 device driver module.
*
* Copyright (c) 1999-2002 Vojtech Pavlik
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*/
#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/moduleparam.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/config.h>
#include <linux/smp_lock.h>
#include <linux/random.h>
#include <linux/major.h>
#include <linux/device.h>
#include <linux/devfs_fs_kernel.h>
#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
#include <linux/miscdevice.h>
#endif
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces");
MODULE_LICENSE("GPL");
#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
static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X;
module_param(xres, uint, 0);
MODULE_PARM_DESC(xres, "Horizontal screen resolution");
static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;
module_param(yres, uint, 0);
MODULE_PARM_DESC(yres, "Vertical screen resolution");
struct mousedev {
int exist;
int open;
int minor;
int misc;
char name[16];
wait_queue_head_t wait;
struct list_head list;
struct input_handle handle;
};
struct mousedev_list {
struct fasync_struct *fasync;
struct mousedev *mousedev;
struct list_head node;
int dx, dy, dz;
int old_x[4], old_y[4];
unsigned long buttons;
signed char ps2[6];
unsigned char ready, buffer, bufsiz;
unsigned char mode, imexseq, impsseq;
unsigned int pkt_count;
unsigned char touch;
};
#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;
#define fx(i) (list->old_x[(list->pkt_count - (i)) & 03])
#define fy(i) (list->old_y[(list->pkt_count - (i)) & 03])
static void mousedev_abs_event(struct input_handle *handle, struct mousedev_list *list, unsigned int code, int value)
{
int size;
int touchpad;
/* Ignore joysticks */
if (test_bit(BTN_TRIGGER, handle->dev->keybit))
return;
touchpad = test_bit(BTN_TOOL_FINGER, handle->dev->keybit);
switch (code) {
case ABS_X:
if (touchpad) {
if (list->touch) {
fx(0) = value;
if (list->pkt_count >= 2)
list->dx = ((fx(0) - fx(1)) / 2 + (fx(1) - fx(2)) / 2) / 8;
}
} else {
size = handle->dev->absmax[ABS_X] - handle->dev->absmin[ABS_X];
if (size == 0) size = xres;
list->dx += (value * xres - list->old_x[0]) / size;
list->old_x[0] += list->dx * size;
}
break;
case ABS_Y:
if (touchpad) {
if (list->touch) {
fy(0) = value;
if (list->pkt_count >= 2)
list->dy = -((fy(0) - fy(1)) / 2 + (fy(1) - fy(2)) / 2) / 8;
}
} else {
size = handle->dev->absmax[ABS_Y] - handle->dev->absmin[ABS_Y];
if (size == 0) size = yres;
list->dy -= (value * yres - list->old_y[0]) / size;
list->old_y[0] -= list->dy * size;
}
break;
}
}
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, wake;
while (*mousedev) {
wake = 0;
list_for_each_entry(list, &(*mousedev)->list, node)
switch (type) {
case EV_ABS:
mousedev_abs_event(handle, list, code, value);
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:
if (code == BTN_TOUCH && test_bit(BTN_TOOL_FINGER, handle->dev->keybit)) {
/* Handle touchpad data */
list->touch = value;
if (!list->touch)
list->pkt_count = 0;
break;
}
switch (code) {
case BTN_TOUCH:
case BTN_0:
case BTN_FORWARD:
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_BACK:
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;
case EV_SYN:
switch (code) {
case SYN_REPORT:
if (list->touch) {
list->pkt_count++;
/* Input system eats duplicate events,
* but we need all of them to do correct
* averaging so apply present one forward
*/
fx(0) = fx(1);
fy(0) = fy(1);
}
list->ready = 1;
kill_fasync(&list->fasync, SIGIO, POLL_IN);
wake = 1;
break;
}
}
if (wake)
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 void mousedev_free(struct mousedev *mousedev)
{
devfs_remove("input/mouse%d", mousedev->minor);
class_simple_device_remove(MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + mousedev->minor));
mousedev_table[mousedev->minor] = NULL;
kfree(mousedev);
}
static int mixdev_release(void)
{
struct input_handle *handle;
list_for_each_entry(handle, &mousedev_handler.h_list, h_node) {
struct mousedev *mousedev = handle->private;
if (!mousedev->open) {
if (mousedev->exist)
input_close_device(&mousedev->handle);
else
mousedev_free(mousedev);
}
}
return 0;
}
static int mousedev_release(struct inode * inode, struct file * file)
{
struct mousedev_list *list = file->private_data;
mousedev_fasync(-1, file, 0);
list_del(&list->node);
if (!--list->mousedev->open) {
if (list->mousedev->minor == MOUSEDEV_MIX)
return mixdev_release();
if (!mousedev_mix.open) {
if (list->mousedev->exist)
input_close_device(&list->mousedev->handle);
else
mousedev_free(list->mousedev);
}
}
kfree(list);
return 0;
}
static int mousedev_open(struct inode * inode, struct file * file)
{
struct mousedev_list *list;
struct input_handle *handle;
struct mousedev *mousedev;
int i;
#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
if (imajor(inode) == MISC_MAJOR)
i = MOUSEDEV_MIX;
else
#endif
i = iminor(inode) - 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_add_tail(&list->node, &mousedev_table[i]->list);
file->private_data = list;
if (!list->mousedev->open++) {
if (list->mousedev->minor == MOUSEDEV_MIX) {
list_for_each_entry(handle, &mousedev_handler.h_list, h_node) {
mousedev = handle->private;
if (!mousedev->open && mousedev->exist)
input_open_device(handle);
}
} else
if (!mousedev_mix.open && 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;
unsigned 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;
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;
case 0xff: /* Reset */
list->impsseq = 0;
list->imexseq = 0;
list->mode = 0;
list->ps2[0] = 0xaa;
list->ps2[1] = 0x00;
list->bufsiz = 2;
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)
{
struct mousedev_list *list = file->private_data;
int retval = 0;
if (!list->ready && !list->buffer && (file->f_flags & O_NONBLOCK))
return -EAGAIN;
retval = wait_event_interruptible(list->mousedev->wait, list->ready || list->buffer);
if (retval)
return retval;
if (!list->buffer && list->ready)
mousedev_packet(list, 0);
if (count > list->buffer)
count = list->buffer;
list->buffer -= count;
if (copy_to_user(buffer, list->ps2 + list->bufsiz - list->buffer - count, count))
return -EFAULT;
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 input_device_id *id)
{
struct mousedev *mousedev;
int minor = 0;
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_LIST_HEAD(&mousedev->list);
init_waitqueue_head(&mousedev->wait);
mousedev->minor = minor;
mousedev->exist = 1;
mousedev->handle.dev = dev;
mousedev->handle.name = mousedev->name;
mousedev->handle.handler = handler;
mousedev->handle.private = mousedev;
sprintf(mousedev->name, "mouse%d", minor);
if (mousedev_mix.open)
input_open_device(&mousedev->handle);
mousedev_table[minor] = mousedev;
devfs_mk_cdev(MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor),
S_IFCHR|S_IRUGO|S_IWUSR, "input/mouse%d", minor);
class_simple_device_add(input_class,
MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor),
dev->dev, "mouse%d", minor);
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);
mousedev_free(mousedev);
}
}
static struct input_device_id mousedev_ids[] = {
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
.evbit = { BIT(EV_KEY) | BIT(EV_REL) },
.keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) },
.relbit = { BIT(REL_X) | BIT(REL_Y) },
}, /* A mouse like device, at least one button, two relative axes */
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
.evbit = { BIT(EV_KEY) | BIT(EV_REL) },
.relbit = { BIT(REL_WHEEL) },
}, /* A separate scrollwheel */
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
.evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
.keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
.absbit = { BIT(ABS_X) | BIT(ABS_Y) },
}, /* A tablet like device, at least touch detection, two absolute axes */
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
.evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
.keybit = { [LONG(BTN_TOOL_FINGER)] = BIT(BTN_TOOL_FINGER) },
.absbit = { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) | BIT(ABS_TOOL_WIDTH) },
}, /* A touchpad */
{ }, /* Terminating entry */
};
MODULE_DEVICE_TABLE(input, mousedev_ids);
static struct input_handler mousedev_handler = {
.event = mousedev_event,
.connect = mousedev_connect,
.disconnect = mousedev_disconnect,
.fops = &mousedev_fops,
.minor = MOUSEDEV_MINOR_BASE,
.name = "mousedev",
.id_table = mousedev_ids,
};
#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
static struct miscdevice psaux_mouse = {
PSMOUSE_MINOR, "psaux", &mousedev_fops
};
#endif
static int __init mousedev_init(void)
{
input_register_handler(&mousedev_handler);
memset(&mousedev_mix, 0, sizeof(struct mousedev));
INIT_LIST_HEAD(&mousedev_mix.list);
init_waitqueue_head(&mousedev_mix.wait);
mousedev_table[MOUSEDEV_MIX] = &mousedev_mix;
mousedev_mix.exist = 1;
mousedev_mix.minor = MOUSEDEV_MIX;
devfs_mk_cdev(MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX),
S_IFCHR|S_IRUGO|S_IWUSR, "input/mice");
class_simple_device_add(input_class, MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX),
NULL, "mice");
#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
if (!(mousedev_mix.misc = !misc_register(&psaux_mouse)))
printk(KERN_WARNING "mice: could not misc_register the device\n");
#endif
printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");
return 0;
}
static void __exit mousedev_exit(void)
{
#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
if (mousedev_mix.misc)
misc_deregister(&psaux_mouse);
#endif
devfs_remove("input/mice");
class_simple_device_remove(MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX));
input_unregister_handler(&mousedev_handler);
}
module_init(mousedev_init);
module_exit(mousedev_exit);