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/*
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* $Id: tsdev.c,v 1.15 2002/04/10 16:50:19 jsimmons Exp $
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*
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* Copyright (c) 2001 "Crazy" james Simmons
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*
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* Compaq touchscreen protocol driver. The protocol emulated by this driver
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* is obsolete; for new programs use the tslib library which can read directly
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* from evdev and perform dejittering, variance filtering and calibration -
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* all in user space, not at kernel level. The meaning of this driver is
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* to allow usage of newer input drivers with old applications that use the
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* old /dev/h3600_ts and /dev/h3600_tsraw devices.
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*
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* 09-Apr-2004: Andrew Zabolotny <zap@homelink.ru>
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* Fixed to actually work, not just output random numbers.
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* Added support for both h3600_ts and h3600_tsraw protocol
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* emulation.
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*/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Should you need to contact me, the author, you can do so either by
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* e-mail - mail your message to <jsimmons@infradead.org>.
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*/
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#define TSDEV_MINOR_BASE 128
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#define TSDEV_MINORS 32
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/* First 16 devices are h3600_ts compatible; second 16 are h3600_tsraw */
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#define TSDEV_MINOR_MASK 15
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#define TSDEV_BUFFER_SIZE 64
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#include <linux/slab.h>
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#include <linux/poll.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/input.h>
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#include <linux/major.h>
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#include <linux/config.h>
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#include <linux/smp_lock.h>
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#include <linux/random.h>
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#include <linux/time.h>
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#include <linux/device.h>
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#ifndef CONFIG_INPUT_TSDEV_SCREEN_X
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#define CONFIG_INPUT_TSDEV_SCREEN_X 240
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#endif
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#ifndef CONFIG_INPUT_TSDEV_SCREEN_Y
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#define CONFIG_INPUT_TSDEV_SCREEN_Y 320
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#endif
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/* This driver emulates both protocols of the old h3600_ts and h3600_tsraw
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* devices. The first one must output X/Y data in 'cooked' format, e.g.
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* filtered, dejittered and calibrated. Second device just outputs raw
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* data received from the hardware.
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*
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* This driver doesn't support filtering and dejittering; it supports only
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* calibration. Filtering and dejittering must be done in the low-level
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* driver, if needed, because it may gain additional benefits from knowing
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* the low-level details, the nature of noise and so on.
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*
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* The driver precomputes a calibration matrix given the initial xres and
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* yres values (quite innacurate for most touchscreens) that will result
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* in a more or less expected range of output values. The driver supports
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* the TS_SET_CAL ioctl, which will replace the calibration matrix with a
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* new one, supposedly generated from the values taken from the raw device.
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*/
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MODULE_AUTHOR("James Simmons <jsimmons@transvirtual.com>");
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MODULE_DESCRIPTION("Input driver to touchscreen converter");
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MODULE_LICENSE("GPL");
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static int xres = CONFIG_INPUT_TSDEV_SCREEN_X;
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module_param(xres, uint, 0);
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MODULE_PARM_DESC(xres, "Horizontal screen resolution (can be negative for X-mirror)");
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static int yres = CONFIG_INPUT_TSDEV_SCREEN_Y;
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module_param(yres, uint, 0);
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MODULE_PARM_DESC(yres, "Vertical screen resolution (can be negative for Y-mirror)");
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/* From Compaq's Touch Screen Specification version 0.2 (draft) */
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struct ts_event {
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short pressure;
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short x;
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short y;
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short millisecs;
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};
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struct ts_calibration {
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int xscale;
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int xtrans;
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int yscale;
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int ytrans;
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int xyswap;
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};
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struct tsdev {
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int exist;
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int open;
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int minor;
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char name[8];
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wait_queue_head_t wait;
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struct list_head list;
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struct input_handle handle;
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int x, y, pressure;
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struct ts_calibration cal;
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};
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struct tsdev_list {
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struct fasync_struct *fasync;
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struct list_head node;
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struct tsdev *tsdev;
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int head, tail;
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struct ts_event event[TSDEV_BUFFER_SIZE];
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int raw;
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};
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/* The following ioctl codes are defined ONLY for backward compatibility.
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* Don't use tsdev for new developement; use the tslib library instead.
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* Touchscreen calibration is a fully userspace task.
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*/
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/* Use 'f' as magic number */
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#define IOC_H3600_TS_MAGIC 'f'
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#define TS_GET_CAL _IOR(IOC_H3600_TS_MAGIC, 10, struct ts_calibration)
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#define TS_SET_CAL _IOW(IOC_H3600_TS_MAGIC, 11, struct ts_calibration)
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static struct input_handler tsdev_handler;
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static struct tsdev *tsdev_table[TSDEV_MINORS/2];
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static int tsdev_fasync(int fd, struct file *file, int on)
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{
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struct tsdev_list *list = file->private_data;
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int retval;
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retval = fasync_helper(fd, file, on, &list->fasync);
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return retval < 0 ? retval : 0;
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}
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static int tsdev_open(struct inode *inode, struct file *file)
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{
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int i = iminor(inode) - TSDEV_MINOR_BASE;
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struct tsdev_list *list;
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if (i >= TSDEV_MINORS || !tsdev_table[i & TSDEV_MINOR_MASK])
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return -ENODEV;
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if (!(list = kmalloc(sizeof(struct tsdev_list), GFP_KERNEL)))
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return -ENOMEM;
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memset(list, 0, sizeof(struct tsdev_list));
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list->raw = (i >= TSDEV_MINORS/2) ? 1 : 0;
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i &= TSDEV_MINOR_MASK;
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list->tsdev = tsdev_table[i];
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list_add_tail(&list->node, &tsdev_table[i]->list);
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file->private_data = list;
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if (!list->tsdev->open++)
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if (list->tsdev->exist)
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input_open_device(&list->tsdev->handle);
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return 0;
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}
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static void tsdev_free(struct tsdev *tsdev)
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{
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tsdev_table[tsdev->minor] = NULL;
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kfree(tsdev);
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}
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static int tsdev_release(struct inode *inode, struct file *file)
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{
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struct tsdev_list *list = file->private_data;
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tsdev_fasync(-1, file, 0);
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list_del(&list->node);
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if (!--list->tsdev->open) {
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if (list->tsdev->exist)
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input_close_device(&list->tsdev->handle);
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else
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tsdev_free(list->tsdev);
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}
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kfree(list);
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return 0;
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}
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static ssize_t tsdev_read(struct file *file, char __user *buffer, size_t count,
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loff_t * ppos)
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{
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struct tsdev_list *list = file->private_data;
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int retval = 0;
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if (list->head == list->tail && list->tsdev->exist && (file->f_flags & O_NONBLOCK))
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return -EAGAIN;
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retval = wait_event_interruptible(list->tsdev->wait,
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list->head != list->tail || !list->tsdev->exist);
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if (retval)
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return retval;
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if (!list->tsdev->exist)
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return -ENODEV;
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while (list->head != list->tail &&
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retval + sizeof (struct ts_event) <= count) {
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if (copy_to_user (buffer + retval, list->event + list->tail,
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sizeof (struct ts_event)))
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return -EFAULT;
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list->tail = (list->tail + 1) & (TSDEV_BUFFER_SIZE - 1);
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retval += sizeof (struct ts_event);
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}
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return retval;
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}
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/* No kernel lock - fine */
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static unsigned int tsdev_poll(struct file *file, poll_table * wait)
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{
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struct tsdev_list *list = file->private_data;
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poll_wait(file, &list->tsdev->wait, wait);
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return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) |
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(list->tsdev->exist ? 0 : (POLLHUP | POLLERR));
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}
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static int tsdev_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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struct tsdev_list *list = file->private_data;
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struct tsdev *tsdev = list->tsdev;
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int retval = 0;
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switch (cmd) {
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case TS_GET_CAL:
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if (copy_to_user ((void __user *)arg, &tsdev->cal,
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sizeof (struct ts_calibration)))
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retval = -EFAULT;
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break;
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case TS_SET_CAL:
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if (copy_from_user (&tsdev->cal, (void __user *)arg,
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sizeof (struct ts_calibration)))
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retval = -EFAULT;
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break;
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default:
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retval = -EINVAL;
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break;
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}
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return retval;
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}
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static struct file_operations tsdev_fops = {
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.owner = THIS_MODULE,
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.open = tsdev_open,
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.release = tsdev_release,
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.read = tsdev_read,
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.poll = tsdev_poll,
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.fasync = tsdev_fasync,
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.ioctl = tsdev_ioctl,
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};
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static void tsdev_event(struct input_handle *handle, unsigned int type,
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unsigned int code, int value)
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{
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struct tsdev *tsdev = handle->private;
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struct tsdev_list *list;
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struct timeval time;
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switch (type) {
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case EV_ABS:
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switch (code) {
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case ABS_X:
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tsdev->x = value;
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break;
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case ABS_Y:
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tsdev->y = value;
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break;
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case ABS_PRESSURE:
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if (value > handle->dev->absmax[ABS_PRESSURE])
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value = handle->dev->absmax[ABS_PRESSURE];
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value -= handle->dev->absmin[ABS_PRESSURE];
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if (value < 0)
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value = 0;
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tsdev->pressure = value;
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break;
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}
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break;
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case EV_REL:
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switch (code) {
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case REL_X:
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tsdev->x += value;
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if (tsdev->x < 0)
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tsdev->x = 0;
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else if (tsdev->x > xres)
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tsdev->x = xres;
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break;
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case REL_Y:
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tsdev->y += value;
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if (tsdev->y < 0)
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tsdev->y = 0;
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else if (tsdev->y > yres)
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tsdev->y = yres;
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break;
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}
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break;
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case EV_KEY:
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if (code == BTN_TOUCH || code == BTN_MOUSE) {
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switch (value) {
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case 0:
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tsdev->pressure = 0;
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break;
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case 1:
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if (!tsdev->pressure)
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tsdev->pressure = 1;
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break;
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}
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}
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|
|
break;
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}
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|
|
if (type != EV_SYN || code != SYN_REPORT)
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return;
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list_for_each_entry(list, &tsdev->list, node) {
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|
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int x, y, tmp;
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|
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do_gettimeofday(&time);
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|
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list->event[list->head].millisecs = time.tv_usec / 100;
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|
|
list->event[list->head].pressure = tsdev->pressure;
|
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|
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x = tsdev->x;
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y = tsdev->y;
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|
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|
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/* Calibration */
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|
|
if (!list->raw) {
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|
x = ((x * tsdev->cal.xscale) >> 8) + tsdev->cal.xtrans;
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|
y = ((y * tsdev->cal.yscale) >> 8) + tsdev->cal.ytrans;
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|
|
if (tsdev->cal.xyswap) {
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|
|
tmp = x; x = y; y = tmp;
|
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|
}
|
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|
|
}
|
|
|
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|
|
list->event[list->head].x = x;
|
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|
|
list->event[list->head].y = y;
|
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|
|
list->head = (list->head + 1) & (TSDEV_BUFFER_SIZE - 1);
|
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|
|
kill_fasync(&list->fasync, SIGIO, POLL_IN);
|
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|
|
}
|
|
|
|
wake_up_interruptible(&tsdev->wait);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct input_handle *tsdev_connect(struct input_handler *handler,
|
|
|
|
struct input_dev *dev,
|
|
|
|
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 = kmalloc(sizeof(struct tsdev), GFP_KERNEL)))
|
|
|
|
return NULL;
|
|
|
|
memset(tsdev, 0, sizeof(struct tsdev));
|
|
|
|
|
|
|
|
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 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)
|
|
|
|
{
|
|
|
|
input_register_handler(&tsdev_handler);
|
|
|
|
printk(KERN_INFO "ts: Compaq touchscreen protocol output\n");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit tsdev_exit(void)
|
|
|
|
{
|
|
|
|
input_unregister_handler(&tsdev_handler);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(tsdev_init);
|
|
|
|
module_exit(tsdev_exit);
|