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/*
* $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* is obsolete; for new programs use the tslib library which can read directly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/config.h>
#include <linux/smp_lock.h>
#include <linux/random.h>
#include <linux/time.h>
#include <linux/device.h>
#include <linux/devfs_fs_kernel.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 input_handler tsdev_handler;
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 = kmalloc(sizeof(struct tsdev_list), GFP_KERNEL)))
return -ENOMEM;
memset(list, 0, sizeof(struct tsdev_list));
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 r
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