projects/linux·blob v2.6.13 · refs

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1/*
2 * $Id: tsdev.c,v 1.15 2002/04/10 16:50:19 jsimmons Exp $
3 *
4 * Copyright (c) 2001 "Crazy" james Simmons
5 *
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7 * is obsolete; for new programs use the tslib library which can read directly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.
12 *
13 * 09-Apr-2004: Andrew Zabolotny <[email protected]>
14 * Fixed to actually work, not just output random numbers.
15 * Added support for both h3600_ts and h3600_tsraw protocol
16 * emulation.
17 */
18
19/*
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.
24 *
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.
29 *
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
33 *
34 * Should you need to contact me, the author, you can do so either by
35 * e-mail - mail your message to <[email protected]>.
36 */
37
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
43
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>
57
58#ifndef CONFIG_INPUT_TSDEV_SCREEN_X
59#define CONFIG_INPUT_TSDEV_SCREEN_X 240
60#endif
61#ifndef CONFIG_INPUT_TSDEV_SCREEN_Y
62#define CONFIG_INPUT_TSDEV_SCREEN_Y 320
63#endif
64
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.
69 *
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.
74 *
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.
80 */
81
82MODULE_AUTHOR("James Simmons <[email protected]>");
83MODULE_DESCRIPTION("Input driver to touchscreen converter");
84MODULE_LICENSE("GPL");
85
86static int xres = CONFIG_INPUT_TSDEV_SCREEN_X;
87module_param(xres, uint, 0);
88MODULE_PARM_DESC(xres, "Horizontal screen resolution (can be negative for X-mirror)");
89
90static int yres = CONFIG_INPUT_TSDEV_SCREEN_Y;
91module_param(yres, uint, 0);
92MODULE_PARM_DESC(yres, "Vertical screen resolution (can be negative for Y-mirror)");
93
94/* From Compaq's Touch Screen Specification version 0.2 (draft) */
95struct ts_event {
96 short pressure;
97 short x;
98 short y;
99 short millisecs;
100};
101
102struct ts_calibration {
103 int xscale;
104 int xtrans;
105 int yscale;
106 int ytrans;
107 int xyswap;
108};
109
110struct tsdev {
111 int exist;
112 int open;
113 int minor;
114 char name[8];
115 wait_queue_head_t wait;
116 struct list_head list;
117 struct input_handle handle;
118 int x, y, pressure;
119 struct ts_calibration cal;
120};
121
122struct tsdev_list {
123 struct fasync_struct *fasync;
124 struct list_head node;
125 struct tsdev *tsdev;
126 int head, tail;
127 struct ts_event event[TSDEV_BUFFER_SIZE];
128 int raw;
129};
130
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.
134 */
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)
139
140static struct input_handler tsdev_handler;
141
142static struct tsdev *tsdev_table[TSDEV_MINORS/2];
143
144static int tsdev_fasync(int fd, struct file *file, int on)
145{
146 struct tsdev_list *list = file->private_data;
147 int retval;
148
149 retval = fasync_helper(fd, file, on, &list->fasync);
150 return retval < 0 ? retval : 0;
151}
152
153static int tsdev_open(struct inode *inode, struct file *file)
154{
155 int i = iminor(inode) - TSDEV_MINOR_BASE;
156 struct tsdev_list *list;
157
158 if (i >= TSDEV_MINORS || !tsdev_table[i & TSDEV_MINOR_MASK])
159 return -ENODEV;
160
161 if (!(list = kmalloc(sizeof(struct tsdev_list), GFP_KERNEL)))
162 return -ENOMEM;
163 memset(list, 0, sizeof(struct tsdev_list));
164
165 list->raw = (i >= TSDEV_MINORS/2) ? 1 : 0;
166
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;
171
172 if (!list->tsdev->open++)
173 if (list->tsdev->exist)
174 input_open_device(&list->tsdev->handle);
175 return 0;
176}
177
178static void tsdev_free(struct tsdev *tsdev)
179{
180 tsdev_table[tsdev->minor] = NULL;
181 kfree(tsdev);
182}
183
184static int tsdev_release(struct inode *inode, struct file *file)
185{
186 struct tsdev_list *list = file->private_data;
187
188 tsdev_fasync(-1, file, 0);
189 list_del(&list->node);
190
191 if (!--list->tsdev->open) {
192 if (list->tsdev->exist)
193 input_close_device(&list->tsdev->handle);
194 else
195 tsdev_free(list->tsdev);
196 }
197 kfree(list);
198 return 0;
199}
200
201static ssize_t tsdev_read(struct file *file, char __user *buffer, size_t count,
202 loff_t * ppos)
203{
204 struct tsdev_list *list = file->private_data;
205 int retval = 0;
206
207 if (list->head == list->tail && list->tsdev->exist && (file->f_flags & O_NONBLOCK))
208 return -EAGAIN;
209
210 retval = wait_event_interruptible(list->tsdev->wait,
211 list->head != list->tail || !list->tsdev->exist);
212
213 if (retval)
214 return retval;
215
216 if (!list->tsdev->exist)
217 return -ENODEV;
218
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)))
223 return -EFAULT;
224 list->tail = (list->tail + 1) & (TSDEV_BUFFER_SIZE - 1);
225 retval += sizeof (struct ts_event);
226 }
227
228 return retval;
229}
230
231/* No kernel lock - fine */
232static unsigned int tsdev_poll(struct file *file, poll_table * wait)
233{
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));
238}
239
240static int tsdev_ioctl(struct inode *inode, struct file *file,
241 unsigned int cmd, unsigned long arg)
242{
243 struct tsdev_list *list = file->private_data;
244 struct tsdev *tsdev = list->tsdev;
245 int retval = 0;
246
247 switch (cmd) {
248 case TS_GET_CAL:
249 if (copy_to_user ((void __user *)arg, &tsdev->cal,
250 sizeof (struct ts_calibration)))
251 retval = -EFAULT;
252 break;
253 case TS_SET_CAL:
254 if (copy_from_user (&tsdev->cal, (void __user *)arg,
255 sizeof (struct ts_calibration)))
256 retval = -EFAULT;
257 break;
258 default:
259 retval = -EINVAL;
260 break;
261 }
262
263 return retval;
264}
265
266static struct file_operations tsdev_fops = {
267 .owner = THIS_MODULE,
268 .open = tsdev_open,
269 .release = tsdev_release,
270 .read = tsdev_read,
271 .poll = tsdev_poll,
272 .fasync = tsdev_fasync,
273 .ioctl = tsdev_ioctl,
274};
275
276static void tsdev_event(struct input_handle *handle, unsigned int type,
277 unsigned int code, int value)
278{
279 struct tsdev *tsdev = handle->private;
280 struct tsdev_list *list;
281 struct timeval time;
282
283 switch (type) {
284 case EV_ABS:
285 switch (code) {
286 case ABS_X:
287 tsdev->x = value;
288 break;
289 case ABS_Y:
290 tsdev->y = value;
291 break;
292 case ABS_PRESSURE:
293 if (value > handle->dev->absmax[ABS_PRESSURE])
294 value = handle->dev->absmax[ABS_PRESSURE];
295 value -= handle->dev->absmin[ABS_PRESSURE];
296 if (value < 0)
297 value = 0;
298 tsdev->pressure = value;
299 break;
300 }
301 break;
302
303 case EV_REL:
304 switch (code) {
305 case REL_X:
306 tsdev->x += value;
307 if (tsdev->x < 0)
308 tsdev->x = 0;
309 else if (tsdev->x > xres)
310 tsdev->x = xres;
311 break;
312 case REL_Y:
313 tsdev->y += value;
314 if (tsdev->y < 0)
315 tsdev->y = 0;
316 else if (tsdev->y > yres)
317 tsdev->y = yres;
318 break;
319 }
320 break;
321
322 case EV_KEY:
323 if (code == BTN_TOUCH || code == BTN_MOUSE) {
324 switch (value) {
325 case 0:
326 tsdev->pressure = 0;
327 break;
328 case 1:
329 if (!tsdev->pressure)
330 tsdev->pressure = 1;
331 break;
332 }
333 }
334 break;
335 }
336
337 if (type != EV_SYN || code != SYN_REPORT)
338 return;
339
340 list_for_each_entry(list, &tsdev->list, node) {
341 int x, y, tmp;
342
343 do_gettimeofday(&time);
344 list->event[list->head].millisecs = time.tv_usec / 100;
345 list->event[list->head].pressure = tsdev->pressure;
346
347 x = tsdev->x;
348 y = tsdev->y;
349
350 /* Calibration */
351 if (!list->raw) {
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;
356 }
357 }
358
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);
363 }
364 wake_up_interruptible(&tsdev->wait);
365}
366
367static struct input_handle *tsdev_connect(struct input_handler *handler,
368 struct input_dev *dev,
369 struct input_device_id *id)
370{
371 struct tsdev *tsdev;
372 int minor, delta;
373
374 for (minor = 0; minor < TSDEV_MINORS/2 && tsdev_table[minor];
375 minor++);
376 if (minor >= TSDEV_MINORS/2) {
377 printk(KERN_ERR
378 "tsdev: You have way too many touchscreens\n");
379 return NULL;
380 }
381
382 if (!(tsdev = kmalloc(sizeof(struct tsdev), GFP_KERNEL)))
383 return NULL;
384 memset(tsdev, 0, sizeof(struct tsdev));
385
386 INIT_LIST_HEAD(&tsdev->list);
387 init_waitqueue_head(&tsdev->wait);
388
389 sprintf(tsdev->name, "ts%d", minor);
390
391 tsdev->exist = 1;
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;
397
398 /* Precompute the rough calibration matrix */
399 delta = dev->absmax [ABS_X] - dev->absmin [ABS_X] + 1;
400 if (delta == 0)
401 delta = 1;
402 tsdev->cal.xscale = (xres << 8) / delta;
403 tsdev->cal.xtrans = - ((dev->absmin [ABS_X] * tsdev->cal.xscale) >> 8);
404
405 delta = dev->absmax [ABS_Y] - dev->absmin [ABS_Y] + 1;
406 if (delta == 0)
407 delta = 1;
408 tsdev->cal.yscale = (yres << 8) / delta;
409 tsdev->cal.ytrans = - ((dev->absmin [ABS_Y] * tsdev->cal.yscale) >> 8);
410
411 tsdev_table[minor] = tsdev;
412
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);
420
421 return &tsdev->handle;
422}
423
424static void tsdev_disconnect(struct input_handle *handle)
425{
426 struct tsdev *tsdev = handle->private;
427 struct tsdev_list *list;
428
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);
433 tsdev->exist = 0;
434
435 if (tsdev->open) {
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);
440 } else
441 tsdev_free(tsdev);
442}
443
444static struct input_device_id tsdev_ids[] = {
445 {
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 */
451
452 {
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 */
458
459 {
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 */
464
465 {},/* Terminating entry */
466};
467
468MODULE_DEVICE_TABLE(input, tsdev_ids);
469
470static struct input_handler tsdev_handler = {
471 .event = tsdev_event,
472 .connect = tsdev_connect,
473 .disconnect = tsdev_disconnect,
474 .fops = &tsdev_fops,
475 .minor = TSDEV_MINOR_BASE,
476 .name = "tsdev",
477 .id_table = tsdev_ids,
478};
479
480static int __init tsdev_init(void)
481{
482 input_register_handler(&tsdev_handler);
483 printk(KERN_INFO "ts: Compaq touchscreen protocol output\n");
484 return 0;
485}
486
487static void __exit tsdev_exit(void)
488{
489 input_unregister_handler(&tsdev_handler);
490}
491
492module_init(tsdev_init);
493module_exit(tsdev_exit);