2 * $Id: tsdev.c,v 1.15 2002/04/10 16:50:19 jsimmons Exp $
4 * Copyright (c) 2001 "Crazy" james Simmons
6 * Compaq touchscreen protocol driver. The protocol emulated by this driver
7 * is obsolete; for new programs use the tslib library which can read directly
8 * from evdev and perform dejittering, variance filtering and calibration -
9 * all in user space, not at kernel level. The meaning of this driver is
10 * to allow usage of newer input drivers with old applications that use the
11 * old /dev/h3600_ts and /dev/h3600_tsraw devices.
13 * 09-Apr-2004: Andrew Zabolotny <zap@homelink.ru>
14 * Fixed to actually work, not just output random numbers.
15 * Added support for both h3600_ts and h3600_tsraw protocol
20 * This program is free software; you can redistribute it and/or modify
21 * it under the terms of the GNU General Public License as published by
22 * the Free Software Foundation; either version 2 of the License, or
23 * (at your option) any later version.
25 * This program is distributed in the hope that it will be useful,
26 * but WITHOUT ANY WARRANTY; without even the implied warranty of
27 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
28 * GNU General Public License for more details.
30 * You should have received a copy of the GNU General Public License
31 * along with this program; if not, write to the Free Software
32 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
34 * Should you need to contact me, the author, you can do so either by
35 * e-mail - mail your message to <jsimmons@infradead.org>.
38 #define TSDEV_MINOR_BASE 128
39 #define TSDEV_MINORS 32
40 /* First 16 devices are h3600_ts compatible; second 16 are h3600_tsraw */
41 #define TSDEV_MINOR_MASK 15
42 #define TSDEV_BUFFER_SIZE 64
44 #include <linux/slab.h>
45 #include <linux/poll.h>
46 #include <linux/module.h>
47 #include <linux/moduleparam.h>
48 #include <linux/init.h>
49 #include <linux/input.h>
50 #include <linux/major.h>
51 #include <linux/config.h>
52 #include <linux/smp_lock.h>
53 #include <linux/random.h>
54 #include <linux/time.h>
55 #include <linux/device.h>
56 #include <linux/devfs_fs_kernel.h>
58 #ifndef CONFIG_INPUT_TSDEV_SCREEN_X
59 #define CONFIG_INPUT_TSDEV_SCREEN_X 240
61 #ifndef CONFIG_INPUT_TSDEV_SCREEN_Y
62 #define CONFIG_INPUT_TSDEV_SCREEN_Y 320
65 /* This driver emulates both protocols of the old h3600_ts and h3600_tsraw
66 * devices. The first one must output X/Y data in 'cooked' format, e.g.
67 * filtered, dejittered and calibrated. Second device just outputs raw
68 * data received from the hardware.
70 * This driver doesn't support filtering and dejittering; it supports only
71 * calibration. Filtering and dejittering must be done in the low-level
72 * driver, if needed, because it may gain additional benefits from knowing
73 * the low-level details, the nature of noise and so on.
75 * The driver precomputes a calibration matrix given the initial xres and
76 * yres values (quite innacurate for most touchscreens) that will result
77 * in a more or less expected range of output values. The driver supports
78 * the TS_SET_CAL ioctl, which will replace the calibration matrix with a
79 * new one, supposedly generated from the values taken from the raw device.
82 MODULE_AUTHOR("James Simmons <jsimmons@transvirtual.com>");
83 MODULE_DESCRIPTION("Input driver to touchscreen converter");
84 MODULE_LICENSE("GPL");
86 static int xres = CONFIG_INPUT_TSDEV_SCREEN_X;
87 module_param(xres, uint, 0);
88 MODULE_PARM_DESC(xres, "Horizontal screen resolution (can be negative for X-mirror)");
90 static int yres = CONFIG_INPUT_TSDEV_SCREEN_Y;
91 module_param(yres, uint, 0);
92 MODULE_PARM_DESC(yres, "Vertical screen resolution (can be negative for Y-mirror)");
94 /* From Compaq's Touch Screen Specification version 0.2 (draft) */
102 struct ts_calibration {
115 wait_queue_head_t wait;
116 struct list_head list;
117 struct input_handle handle;
119 struct ts_calibration cal;
123 struct fasync_struct *fasync;
124 struct list_head node;
127 struct ts_event event[TSDEV_BUFFER_SIZE];
131 /* The following ioctl codes are defined ONLY for backward compatibility.
132 * Don't use tsdev for new developement; use the tslib library instead.
133 * Touchscreen calibration is a fully userspace task.
135 /* Use 'f' as magic number */
136 #define IOC_H3600_TS_MAGIC 'f'
137 #define TS_GET_CAL _IOR(IOC_H3600_TS_MAGIC, 10, struct ts_calibration)
138 #define TS_SET_CAL _IOW(IOC_H3600_TS_MAGIC, 11, struct ts_calibration)
140 static struct input_handler tsdev_handler;
142 static struct tsdev *tsdev_table[TSDEV_MINORS/2];
144 static int tsdev_fasync(int fd, struct file *file, int on)
146 struct tsdev_list *list = file->private_data;
149 retval = fasync_helper(fd, file, on, &list->fasync);
150 return retval < 0 ? retval : 0;
153 static int tsdev_open(struct inode *inode, struct file *file)
155 int i = iminor(inode) - TSDEV_MINOR_BASE;
156 struct tsdev_list *list;
158 if (i >= TSDEV_MINORS || !tsdev_table[i & TSDEV_MINOR_MASK])
161 if (!(list = kmalloc(sizeof(struct tsdev_list), GFP_KERNEL)))
163 memset(list, 0, sizeof(struct tsdev_list));
165 list->raw = (i >= TSDEV_MINORS/2) ? 1 : 0;
167 i &= TSDEV_MINOR_MASK;
168 list->tsdev = tsdev_table[i];
169 list_add_tail(&list->node, &tsdev_table[i]->list);
170 file->private_data = list;
172 if (!list->tsdev->open++)
173 if (list->tsdev->exist)
174 input_open_device(&list->tsdev->handle);
178 static void tsdev_free(struct tsdev *tsdev)
180 tsdev_table[tsdev->minor] = NULL;
184 static int tsdev_release(struct inode *inode, struct file *file)
186 struct tsdev_list *list = file->private_data;
188 tsdev_fasync(-1, file, 0);
189 list_del(&list->node);
191 if (!--list->tsdev->open) {
192 if (list->tsdev->exist)
193 input_close_device(&list->tsdev->handle);
195 tsdev_free(list->tsdev);
201 static ssize_t tsdev_read(struct file *file, char __user *buffer, size_t count,
204 struct tsdev_list *list = file->private_data;
207 if (list->head == list->tail && list->tsdev->exist && (file->f_flags & O_NONBLOCK))
210 retval = wait_event_interruptible(list->tsdev->wait,
211 list->head != list->tail || !list->tsdev->exist);
216 if (!list->tsdev->exist)
219 while (list->head != list->tail &&
220 retval + sizeof (struct ts_event) <= count) {
221 if (copy_to_user (buffer + retval, list->event + list->tail,
222 sizeof (struct ts_event)))
224 list->tail = (list->tail + 1) & (TSDEV_BUFFER_SIZE - 1);
225 retval += sizeof (struct ts_event);
231 /* No kernel lock - fine */
232 static unsigned int tsdev_poll(struct file *file, poll_table * wait)
234 struct tsdev_list *list = file->private_data;
235 poll_wait(file, &list->tsdev->wait, wait);
236 return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) |
237 (list->tsdev->exist ? 0 : (POLLHUP | POLLERR));
240 static int tsdev_ioctl(struct inode *inode, struct file *file,
241 unsigned int cmd, unsigned long arg)
243 struct tsdev_list *list = file->private_data;
244 struct tsdev *tsdev = list->tsdev;
249 if (copy_to_user ((void __user *)arg, &tsdev->cal,
250 sizeof (struct ts_calibration)))
254 if (copy_from_user (&tsdev->cal, (void __user *)arg,
255 sizeof (struct ts_calibration)))
266 static struct file_operations tsdev_fops = {
267 .owner = THIS_MODULE,
269 .release = tsdev_release,
272 .fasync = tsdev_fasync,
273 .ioctl = tsdev_ioctl,
276 static void tsdev_event(struct input_handle *handle, unsigned int type,
277 unsigned int code, int value)
279 struct tsdev *tsdev = handle->private;
280 struct tsdev_list *list;
293 if (value > handle->dev->absmax[ABS_PRESSURE])
294 value = handle->dev->absmax[ABS_PRESSURE];
295 value -= handle->dev->absmin[ABS_PRESSURE];
298 tsdev->pressure = value;
309 else if (tsdev->x > xres)
316 else if (tsdev->y > yres)
323 if (code == BTN_TOUCH || code == BTN_MOUSE) {
329 if (!tsdev->pressure)
337 if (type != EV_SYN || code != SYN_REPORT)
340 list_for_each_entry(list, &tsdev->list, node) {
343 do_gettimeofday(&time);
344 list->event[list->head].millisecs = time.tv_usec / 100;
345 list->event[list->head].pressure = tsdev->pressure;
352 x = ((x * tsdev->cal.xscale) >> 8) + tsdev->cal.xtrans;
353 y = ((y * tsdev->cal.yscale) >> 8) + tsdev->cal.ytrans;
354 if (tsdev->cal.xyswap) {
355 tmp = x; x = y; y = tmp;
359 list->event[list->head].x = x;
360 list->event[list->head].y = y;
361 list->head = (list->head + 1) & (TSDEV_BUFFER_SIZE - 1);
362 kill_fasync(&list->fasync, SIGIO, POLL_IN);
364 wake_up_interruptible(&tsdev->wait);
367 static struct input_handle *tsdev_connect(struct input_handler *handler,
368 struct input_dev *dev,
369 struct input_device_id *id)
374 for (minor = 0; minor < TSDEV_MINORS/2 && tsdev_table[minor];
376 if (minor >= TSDEV_MINORS/2) {
378 "tsdev: You have way too many touchscreens\n");
382 if (!(tsdev = kmalloc(sizeof(struct tsdev), GFP_KERNEL)))
384 memset(tsdev, 0, sizeof(struct tsdev));
386 INIT_LIST_HEAD(&tsdev->list);
387 init_waitqueue_head(&tsdev->wait);
389 sprintf(tsdev->name, "ts%d", minor);
392 tsdev->minor = minor;
393 tsdev->handle.dev = dev;
394 tsdev->handle.name = tsdev->name;
395 tsdev->handle.handler = handler;
396 tsdev->handle.private = tsdev;
398 /* Precompute the rough calibration matrix */
399 delta = dev->absmax [ABS_X] - dev->absmin [ABS_X] + 1;
402 tsdev->cal.xscale = (xres << 8) / delta;
403 tsdev->cal.xtrans = - ((dev->absmin [ABS_X] * tsdev->cal.xscale) >> 8);
405 delta = dev->absmax [ABS_Y] - dev->absmin [ABS_Y] + 1;
408 tsdev->cal.yscale = (yres << 8) / delta;
409 tsdev->cal.ytrans = - ((dev->absmin [ABS_Y] * tsdev->cal.yscale) >> 8);
411 tsdev_table[minor] = tsdev;
413 devfs_mk_cdev(MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + minor),
414 S_IFCHR|S_IRUGO|S_IWUSR, "input/ts%d", minor);
415 devfs_mk_cdev(MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + minor + TSDEV_MINORS/2),
416 S_IFCHR|S_IRUGO|S_IWUSR, "input/tsraw%d", minor);
417 class_device_create(input_class,
418 MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + minor),
419 dev->dev, "ts%d", minor);
421 return &tsdev->handle;
424 static void tsdev_disconnect(struct input_handle *handle)
426 struct tsdev *tsdev = handle->private;
427 struct tsdev_list *list;
429 class_device_destroy(input_class,
430 MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + tsdev->minor));
431 devfs_remove("input/ts%d", tsdev->minor);
432 devfs_remove("input/tsraw%d", tsdev->minor);
436 input_close_device(handle);
437 wake_up_interruptible(&tsdev->wait);
438 list_for_each_entry(list, &tsdev->list, node)
439 kill_fasync(&list->fasync, SIGIO, POLL_HUP);
444 static struct input_device_id tsdev_ids[] = {
446 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
447 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
448 .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) },
449 .relbit = { BIT(REL_X) | BIT(REL_Y) },
450 },/* A mouse like device, at least one button, two relative axes */
453 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
454 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
455 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
456 .absbit = { BIT(ABS_X) | BIT(ABS_Y) },
457 },/* A tablet like device, at least touch detection, two absolute axes */
460 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
461 .evbit = { BIT(EV_ABS) },
462 .absbit = { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) },
463 },/* A tablet like device with several gradations of pressure */
465 {},/* Terminating entry */
468 MODULE_DEVICE_TABLE(input, tsdev_ids);
470 static struct input_handler tsdev_handler = {
471 .event = tsdev_event,
472 .connect = tsdev_connect,
473 .disconnect = tsdev_disconnect,
475 .minor = TSDEV_MINOR_BASE,
477 .id_table = tsdev_ids,
480 static int __init tsdev_init(void)
482 input_register_handler(&tsdev_handler);
483 printk(KERN_INFO "ts: Compaq touchscreen protocol output\n");
487 static void __exit tsdev_exit(void)
489 input_unregister_handler(&tsdev_handler);
492 module_init(tsdev_init);
493 module_exit(tsdev_exit);