mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 18:30:06 +00:00
491 lines
13 KiB
C
491 lines
13 KiB
C
/*
|
|
* $Id: tsdev.c,v 1.15 2002/04/10 16:50:19 jsimmons Exp $
|
|
*
|
|
* Copyright (c) 2001 "Crazy" james Simmons
|
|
*
|
|
* Compaq touchscreen protocol driver. The protocol emulated by this driver
|
|
* is obsolete; for new programs use the tslib library which can read directly
|
|
* from evdev and perform dejittering, variance filtering and calibration -
|
|
* all in user space, not at kernel level. The meaning of this driver is
|
|
* to allow usage of newer input drivers with old applications that use the
|
|
* old /dev/h3600_ts and /dev/h3600_tsraw devices.
|
|
*
|
|
* 09-Apr-2004: Andrew Zabolotny <zap@homelink.ru>
|
|
* Fixed to actually work, not just output random numbers.
|
|
* Added support for both h3600_ts and h3600_tsraw protocol
|
|
* emulation.
|
|
*/
|
|
|
|
/*
|
|
* 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 <jsimmons@infradead.org>.
|
|
*/
|
|
|
|
#define TSDEV_MINOR_BASE 128
|
|
#define TSDEV_MINORS 32
|
|
/* First 16 devices are h3600_ts compatible; second 16 are h3600_tsraw */
|
|
#define TSDEV_MINOR_MASK 15
|
|
#define TSDEV_BUFFER_SIZE 64
|
|
|
|
#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/major.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/random.h>
|
|
#include <linux/time.h>
|
|
#include <linux/device.h>
|
|
|
|
#ifndef CONFIG_INPUT_TSDEV_SCREEN_X
|
|
#define CONFIG_INPUT_TSDEV_SCREEN_X 240
|
|
#endif
|
|
#ifndef CONFIG_INPUT_TSDEV_SCREEN_Y
|
|
#define CONFIG_INPUT_TSDEV_SCREEN_Y 320
|
|
#endif
|
|
|
|
/* This driver emulates both protocols of the old h3600_ts and h3600_tsraw
|
|
* devices. The first one must output X/Y data in 'cooked' format, e.g.
|
|
* filtered, dejittered and calibrated. Second device just outputs raw
|
|
* data received from the hardware.
|
|
*
|
|
* This driver doesn't support filtering and dejittering; it supports only
|
|
* calibration. Filtering and dejittering must be done in the low-level
|
|
* driver, if needed, because it may gain additional benefits from knowing
|
|
* the low-level details, the nature of noise and so on.
|
|
*
|
|
* The driver precomputes a calibration matrix given the initial xres and
|
|
* yres values (quite innacurate for most touchscreens) that will result
|
|
* in a more or less expected range of output values. The driver supports
|
|
* the TS_SET_CAL ioctl, which will replace the calibration matrix with a
|
|
* new one, supposedly generated from the values taken from the raw device.
|
|
*/
|
|
|
|
MODULE_AUTHOR("James Simmons <jsimmons@transvirtual.com>");
|
|
MODULE_DESCRIPTION("Input driver to touchscreen converter");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static int xres = CONFIG_INPUT_TSDEV_SCREEN_X;
|
|
module_param(xres, uint, 0);
|
|
MODULE_PARM_DESC(xres, "Horizontal screen resolution (can be negative for X-mirror)");
|
|
|
|
static int yres = CONFIG_INPUT_TSDEV_SCREEN_Y;
|
|
module_param(yres, uint, 0);
|
|
MODULE_PARM_DESC(yres, "Vertical screen resolution (can be negative for Y-mirror)");
|
|
|
|
/* From Compaq's Touch Screen Specification version 0.2 (draft) */
|
|
struct ts_event {
|
|
short pressure;
|
|
short x;
|
|
short y;
|
|
short millisecs;
|
|
};
|
|
|
|
struct ts_calibration {
|
|
int xscale;
|
|
int xtrans;
|
|
int yscale;
|
|
int ytrans;
|
|
int xyswap;
|
|
};
|
|
|
|
struct tsdev {
|
|
int exist;
|
|
int open;
|
|
int minor;
|
|
char name[8];
|
|
wait_queue_head_t wait;
|
|
struct list_head list;
|
|
struct input_handle handle;
|
|
int x, y, pressure;
|
|
struct ts_calibration cal;
|
|
};
|
|
|
|
struct tsdev_list {
|
|
struct fasync_struct *fasync;
|
|
struct list_head node;
|
|
struct tsdev *tsdev;
|
|
int head, tail;
|
|
struct ts_event event[TSDEV_BUFFER_SIZE];
|
|
int raw;
|
|
};
|
|
|
|
/* The following ioctl codes are defined ONLY for backward compatibility.
|
|
* Don't use tsdev for new developement; use the tslib library instead.
|
|
* Touchscreen calibration is a fully userspace task.
|
|
*/
|
|
/* Use 'f' as magic number */
|
|
#define IOC_H3600_TS_MAGIC 'f'
|
|
#define TS_GET_CAL _IOR(IOC_H3600_TS_MAGIC, 10, struct ts_calibration)
|
|
#define TS_SET_CAL _IOW(IOC_H3600_TS_MAGIC, 11, struct ts_calibration)
|
|
|
|
static struct tsdev *tsdev_table[TSDEV_MINORS/2];
|
|
|
|
static int tsdev_fasync(int fd, struct file *file, int on)
|
|
{
|
|
struct tsdev_list *list = file->private_data;
|
|
int retval;
|
|
|
|
retval = fasync_helper(fd, file, on, &list->fasync);
|
|
return retval < 0 ? retval : 0;
|
|
}
|
|
|
|
static int tsdev_open(struct inode *inode, struct file *file)
|
|
{
|
|
int i = iminor(inode) - TSDEV_MINOR_BASE;
|
|
struct tsdev_list *list;
|
|
|
|
if (i >= TSDEV_MINORS || !tsdev_table[i & TSDEV_MINOR_MASK])
|
|
return -ENODEV;
|
|
|
|
if (!(list = kzalloc(sizeof(struct tsdev_list), GFP_KERNEL)))
|
|
return -ENOMEM;
|
|
|
|
list->raw = (i >= TSDEV_MINORS/2) ? 1 : 0;
|
|
|
|
i &= TSDEV_MINOR_MASK;
|
|
list->tsdev = tsdev_table[i];
|
|
list_add_tail(&list->node, &tsdev_table[i]->list);
|
|
file->private_data = list;
|
|
|
|
if (!list->tsdev->open++)
|
|
if (list->tsdev->exist)
|
|
input_open_device(&list->tsdev->handle);
|
|
return 0;
|
|
}
|
|
|
|
static void tsdev_free(struct tsdev *tsdev)
|
|
{
|
|
tsdev_table[tsdev->minor] = NULL;
|
|
kfree(tsdev);
|
|
}
|
|
|
|
static int tsdev_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct tsdev_list *list = file->private_data;
|
|
|
|
tsdev_fasync(-1, file, 0);
|
|
list_del(&list->node);
|
|
|
|
if (!--list->tsdev->open) {
|
|
if (list->tsdev->exist)
|
|
input_close_device(&list->tsdev->handle);
|
|
else
|
|
tsdev_free(list->tsdev);
|
|
}
|
|
kfree(list);
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t tsdev_read(struct file *file, char __user *buffer, size_t count,
|
|
loff_t * ppos)
|
|
{
|
|
struct tsdev_list *list = file->private_data;
|
|
int retval = 0;
|
|
|
|
if (list->head == list->tail && list->tsdev->exist && (file->f_flags & O_NONBLOCK))
|
|
return -EAGAIN;
|
|
|
|
retval = wait_event_interruptible(list->tsdev->wait,
|
|
list->head != list->tail || !list->tsdev->exist);
|
|
|
|
if (retval)
|
|
return retval;
|
|
|
|
if (!list->tsdev->exist)
|
|
return -ENODEV;
|
|
|
|
while (list->head != list->tail &&
|
|
retval + sizeof (struct ts_event) <= count) {
|
|
if (copy_to_user (buffer + retval, list->event + list->tail,
|
|
sizeof (struct ts_event)))
|
|
return -EFAULT;
|
|
list->tail = (list->tail + 1) & (TSDEV_BUFFER_SIZE - 1);
|
|
retval += sizeof (struct ts_event);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/* No kernel lock - fine */
|
|
static unsigned int tsdev_poll(struct file *file, poll_table * wait)
|
|
{
|
|
struct tsdev_list *list = file->private_data;
|
|
|
|
poll_wait(file, &list->tsdev->wait, wait);
|
|
return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) |
|
|
(list->tsdev->exist ? 0 : (POLLHUP | POLLERR));
|
|
}
|
|
|
|
static int tsdev_ioctl(struct inode *inode, struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct tsdev_list *list = file->private_data;
|
|
struct tsdev *tsdev = list->tsdev;
|
|
int retval = 0;
|
|
|
|
switch (cmd) {
|
|
case TS_GET_CAL:
|
|
if (copy_to_user ((void __user *)arg, &tsdev->cal,
|
|
sizeof (struct ts_calibration)))
|
|
retval = -EFAULT;
|
|
break;
|
|
|
|
case TS_SET_CAL:
|
|
if (copy_from_user (&tsdev->cal, (void __user *)arg,
|
|
sizeof (struct ts_calibration)))
|
|
retval = -EFAULT;
|
|
break;
|
|
|
|
default:
|
|
retval = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
static const struct file_operations tsdev_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = tsdev_open,
|
|
.release = tsdev_release,
|
|
.read = tsdev_read,
|
|
.poll = tsdev_poll,
|
|
.fasync = tsdev_fasync,
|
|
.ioctl = tsdev_ioctl,
|
|
};
|
|
|
|
static void tsdev_event(struct input_handle *handle, unsigned int type,
|
|
unsigned int code, int value)
|
|
{
|
|
struct tsdev *tsdev = handle->private;
|
|
struct tsdev_list *list;
|
|
struct timeval time;
|
|
|
|
switch (type) {
|
|
case EV_ABS:
|
|
switch (code) {
|
|
case ABS_X:
|
|
tsdev->x = value;
|
|
break;
|
|
|
|
case ABS_Y:
|
|
tsdev->y = value;
|
|
break;
|
|
|
|
case ABS_PRESSURE:
|
|
if (value > handle->dev->absmax[ABS_PRESSURE])
|
|
value = handle->dev->absmax[ABS_PRESSURE];
|
|
value -= handle->dev->absmin[ABS_PRESSURE];
|
|
if (value < 0)
|
|
value = 0;
|
|
tsdev->pressure = value;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case EV_REL:
|
|
switch (code) {
|
|
case REL_X:
|
|
tsdev->x += value;
|
|
if (tsdev->x < 0)
|
|
tsdev->x = 0;
|
|
else if (tsdev->x > xres)
|
|
tsdev->x = xres;
|
|
break;
|
|
|
|
case REL_Y:
|
|
tsdev->y += value;
|
|
if (tsdev->y < 0)
|
|
tsdev->y = 0;
|
|
else if (tsdev->y > yres)
|
|
tsdev->y = yres;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case EV_KEY:
|
|
if (code == BTN_TOUCH || code == BTN_MOUSE) {
|
|
switch (value) {
|
|
case 0:
|
|
tsdev->pressure = 0;
|
|
break;
|
|
|
|
case 1:
|
|
if (!tsdev->pressure)
|
|
tsdev->pressure = 1;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (type != EV_SYN || code != SYN_REPORT)
|
|
return;
|
|
|
|
list_for_each_entry(list, &tsdev->list, node) {
|
|
int x, y, tmp;
|
|
|
|
do_gettimeofday(&time);
|
|
list->event[list->head].millisecs = time.tv_usec / 100;
|
|
list->event[list->head].pressure = tsdev->pressure;
|
|
|
|
x = tsdev->x;
|
|
y = tsdev->y;
|
|
|
|
/* Calibration */
|
|
if (!list->raw) {
|
|
x = ((x * tsdev->cal.xscale) >> 8) + tsdev->cal.xtrans;
|
|
y = ((y * tsdev->cal.yscale) >> 8) + tsdev->cal.ytrans;
|
|
if (tsdev->cal.xyswap) {
|
|
tmp = x; x = y; y = tmp;
|
|
}
|
|
}
|
|
|
|
list->event[list->head].x = x;
|
|
list->event[list->head].y = y;
|
|
list->head = (list->head + 1) & (TSDEV_BUFFER_SIZE - 1);
|
|
kill_fasync(&list->fasync, SIGIO, POLL_IN);
|
|
}
|
|
wake_up_interruptible(&tsdev->wait);
|
|
}
|
|
|
|
static struct input_handle *tsdev_connect(struct input_handler *handler,
|
|
struct input_dev *dev,
|
|
const struct input_device_id *id)
|
|
{
|
|
struct tsdev *tsdev;
|
|
struct class_device *cdev;
|
|
int minor, delta;
|
|
|
|
for (minor = 0; minor < TSDEV_MINORS / 2 && tsdev_table[minor]; minor++);
|
|
if (minor >= TSDEV_MINORS / 2) {
|
|
printk(KERN_ERR
|
|
"tsdev: You have way too many touchscreens\n");
|
|
return NULL;
|
|
}
|
|
|
|
if (!(tsdev = kzalloc(sizeof(struct tsdev), GFP_KERNEL)))
|
|
return NULL;
|
|
|
|
INIT_LIST_HEAD(&tsdev->list);
|
|
init_waitqueue_head(&tsdev->wait);
|
|
|
|
sprintf(tsdev->name, "ts%d", minor);
|
|
|
|
tsdev->exist = 1;
|
|
tsdev->minor = minor;
|
|
tsdev->handle.dev = dev;
|
|
tsdev->handle.name = tsdev->name;
|
|
tsdev->handle.handler = handler;
|
|
tsdev->handle.private = tsdev;
|
|
|
|
/* Precompute the rough calibration matrix */
|
|
delta = dev->absmax [ABS_X] - dev->absmin [ABS_X] + 1;
|
|
if (delta == 0)
|
|
delta = 1;
|
|
tsdev->cal.xscale = (xres << 8) / delta;
|
|
tsdev->cal.xtrans = - ((dev->absmin [ABS_X] * tsdev->cal.xscale) >> 8);
|
|
|
|
delta = dev->absmax [ABS_Y] - dev->absmin [ABS_Y] + 1;
|
|
if (delta == 0)
|
|
delta = 1;
|
|
tsdev->cal.yscale = (yres << 8) / delta;
|
|
tsdev->cal.ytrans = - ((dev->absmin [ABS_Y] * tsdev->cal.yscale) >> 8);
|
|
|
|
tsdev_table[minor] = tsdev;
|
|
|
|
cdev = class_device_create(&input_class, &dev->cdev,
|
|
MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + minor),
|
|
dev->cdev.dev, tsdev->name);
|
|
|
|
/* temporary symlink to keep userspace happy */
|
|
sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj,
|
|
tsdev->name);
|
|
|
|
return &tsdev->handle;
|
|
}
|
|
|
|
static void tsdev_disconnect(struct input_handle *handle)
|
|
{
|
|
struct tsdev *tsdev = handle->private;
|
|
struct tsdev_list *list;
|
|
|
|
sysfs_remove_link(&input_class.subsys.kset.kobj, tsdev->name);
|
|
class_device_destroy(&input_class,
|
|
MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + tsdev->minor));
|
|
tsdev->exist = 0;
|
|
|
|
if (tsdev->open) {
|
|
input_close_device(handle);
|
|
wake_up_interruptible(&tsdev->wait);
|
|
list_for_each_entry(list, &tsdev->list, node)
|
|
kill_fasync(&list->fasync, SIGIO, POLL_HUP);
|
|
} else
|
|
tsdev_free(tsdev);
|
|
}
|
|
|
|
static const struct input_device_id tsdev_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_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_ABSBIT,
|
|
.evbit = { BIT(EV_ABS) },
|
|
.absbit = { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) },
|
|
}, /* A tablet like device with several gradations of pressure */
|
|
|
|
{} /* Terminating entry */
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(input, tsdev_ids);
|
|
|
|
static struct input_handler tsdev_handler = {
|
|
.event = tsdev_event,
|
|
.connect = tsdev_connect,
|
|
.disconnect = tsdev_disconnect,
|
|
.fops = &tsdev_fops,
|
|
.minor = TSDEV_MINOR_BASE,
|
|
.name = "tsdev",
|
|
.id_table = tsdev_ids,
|
|
};
|
|
|
|
static int __init tsdev_init(void)
|
|
{
|
|
return input_register_handler(&tsdev_handler);
|
|
}
|
|
|
|
static void __exit tsdev_exit(void)
|
|
{
|
|
input_unregister_handler(&tsdev_handler);
|
|
}
|
|
|
|
module_init(tsdev_init);
|
|
module_exit(tsdev_exit);
|