projects/linux·blob v2.6.22 · refs

533 lines · 13.8 KiB

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7 * is obsolete; for new programs use the tslib library which can read directly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/random.h>
52#include <linux/time.h>
53#include <linux/device.h>
54
55#ifndef CONFIG_INPUT_TSDEV_SCREEN_X
56#define CONFIG_INPUT_TSDEV_SCREEN_X 240
57#endif
58#ifndef CONFIG_INPUT_TSDEV_SCREEN_Y
59#define CONFIG_INPUT_TSDEV_SCREEN_Y 320
60#endif
61
62/* This driver emulates both protocols of the old h3600_ts and h3600_tsraw
63 * devices. The first one must output X/Y data in 'cooked' format, e.g.
64 * filtered, dejittered and calibrated. Second device just outputs raw
65 * data received from the hardware.
66 *
67 * This driver doesn't support filtering and dejittering; it supports only
68 * calibration. Filtering and dejittering must be done in the low-level
69 * driver, if needed, because it may gain additional benefits from knowing
70 * the low-level details, the nature of noise and so on.
71 *
72 * The driver precomputes a calibration matrix given the initial xres and
73 * yres values (quite innacurate for most touchscreens) that will result
74 * in a more or less expected range of output values. The driver supports
75 * the TS_SET_CAL ioctl, which will replace the calibration matrix with a
76 * new one, supposedly generated from the values taken from the raw device.
77 */
78
79MODULE_AUTHOR("James Simmons <[email protected]>");
80MODULE_DESCRIPTION("Input driver to touchscreen converter");
81MODULE_LICENSE("GPL");
82
83static int xres = CONFIG_INPUT_TSDEV_SCREEN_X;
84module_param(xres, uint, 0);
85MODULE_PARM_DESC(xres, "Horizontal screen resolution (can be negative for X-mirror)");
86
87static int yres = CONFIG_INPUT_TSDEV_SCREEN_Y;
88module_param(yres, uint, 0);
89MODULE_PARM_DESC(yres, "Vertical screen resolution (can be negative for Y-mirror)");
90
91/* From Compaq's Touch Screen Specification version 0.2 (draft) */
92struct ts_event {
93 short pressure;
94 short x;
95 short y;
96 short millisecs;
97};
98
99struct ts_calibration {
100 int xscale;
101 int xtrans;
102 int yscale;
103 int ytrans;
104 int xyswap;
105};
106
107struct tsdev {
108 int exist;
109 int open;
110 int minor;
111 char name[8];
112 wait_queue_head_t wait;
113 struct list_head client_list;
114 struct input_handle handle;
115 int x, y, pressure;
116 struct ts_calibration cal;
117};
118
119struct tsdev_client {
120 struct fasync_struct *fasync;
121 struct list_head node;
122 struct tsdev *tsdev;
123 int head, tail;
124 struct ts_event event[TSDEV_BUFFER_SIZE];
125 int raw;
126};
127
128/* The following ioctl codes are defined ONLY for backward compatibility.
129 * Don't use tsdev for new developement; use the tslib library instead.
130 * Touchscreen calibration is a fully userspace task.
131 */
132/* Use 'f' as magic number */
133#define IOC_H3600_TS_MAGIC 'f'
134#define TS_GET_CAL _IOR(IOC_H3600_TS_MAGIC, 10, struct ts_calibration)
135#define TS_SET_CAL _IOW(IOC_H3600_TS_MAGIC, 11, struct ts_calibration)
136
137static struct tsdev *tsdev_table[TSDEV_MINORS/2];
138
139static int tsdev_fasync(int fd, struct file *file, int on)
140{
141 struct tsdev_client *client = file->private_data;
142 int retval;
143
144 retval = fasync_helper(fd, file, on, &client->fasync);
145 return retval < 0 ? retval : 0;
146}
147
148static int tsdev_open(struct inode *inode, struct file *file)
149{
150 int i = iminor(inode) - TSDEV_MINOR_BASE;
151 struct tsdev_client *client;
152 struct tsdev *tsdev;
153 int error;
154
155 printk(KERN_WARNING "tsdev (compaq touchscreen emulation) is scheduled "
156 "for removal.\nSee Documentation/feature-removal-schedule.txt "
157 "for details.\n");
158
159 if (i >= TSDEV_MINORS)
160 return -ENODEV;
161
162 tsdev = tsdev_table[i & TSDEV_MINOR_MASK];
163 if (!tsdev || !tsdev->exist)
164 return -ENODEV;
165
166 client = kzalloc(sizeof(struct tsdev_client), GFP_KERNEL);
167 if (!client)
168 return -ENOMEM;
169
170 client->tsdev = tsdev;
171 client->raw = (i >= TSDEV_MINORS / 2) ? 1 : 0;
172 list_add_tail(&client->node, &tsdev->client_list);
173
174 if (!tsdev->open++ && tsdev->exist) {
175 error = input_open_device(&tsdev->handle);
176 if (error) {
177 list_del(&client->node);
178 kfree(client);
179 return error;
180 }
181 }
182
183 file->private_data = client;
184 return 0;
185}
186
187static void tsdev_free(struct tsdev *tsdev)
188{
189 tsdev_table[tsdev->minor] = NULL;
190 kfree(tsdev);
191}
192
193static int tsdev_release(struct inode *inode, struct file *file)
194{
195 struct tsdev_client *client = file->private_data;
196 struct tsdev *tsdev = client->tsdev;
197
198 tsdev_fasync(-1, file, 0);
199
200 list_del(&client->node);
201 kfree(client);
202
203 if (!--tsdev->open) {
204 if (tsdev->exist)
205 input_close_device(&tsdev->handle);
206 else
207 tsdev_free(tsdev);
208 }
209
210 return 0;
211}
212
213static ssize_t tsdev_read(struct file *file, char __user *buffer, size_t count,
214 loff_t *ppos)
215{
216 struct tsdev_client *client = file->private_data;
217 struct tsdev *tsdev = client->tsdev;
218 int retval = 0;
219
220 if (client->head == client->tail && tsdev->exist && (file->f_flags & O_NONBLOCK))
221 return -EAGAIN;
222
223 retval = wait_event_interruptible(tsdev->wait,
224 client->head != client->tail || !tsdev->exist);
225 if (retval)
226 return retval;
227
228 if (!tsdev->exist)
229 return -ENODEV;
230
231 while (client->head != client->tail &&
232 retval + sizeof (struct ts_event) <= count) {
233 if (copy_to_user (buffer + retval, client->event + client->tail,
234 sizeof (struct ts_event)))
235 return -EFAULT;
236 client->tail = (client->tail + 1) & (TSDEV_BUFFER_SIZE - 1);
237 retval += sizeof (struct ts_event);
238 }
239
240 return retval;
241}
242
243/* No kernel lock - fine */
244static unsigned int tsdev_poll(struct file *file, poll_table *wait)
245{
246 struct tsdev_client *client = file->private_data;
247 struct tsdev *tsdev = client->tsdev;
248
249 poll_wait(file, &tsdev->wait, wait);
250 return ((client->head == client->tail) ? 0 : (POLLIN | POLLRDNORM)) |
251 (tsdev->exist ? 0 : (POLLHUP | POLLERR));
252}
253
254static int tsdev_ioctl(struct inode *inode, struct file *file,
255 unsigned int cmd, unsigned long arg)
256{
257 struct tsdev_client *client = file->private_data;
258 struct tsdev *tsdev = client->tsdev;
259 int retval = 0;
260
261 switch (cmd) {
262 case TS_GET_CAL:
263 if (copy_to_user((void __user *)arg, &tsdev->cal,
264 sizeof (struct ts_calibration)))
265 retval = -EFAULT;
266 break;
267
268 case TS_SET_CAL:
269 if (copy_from_user(&tsdev->cal, (void __user *)arg,
270 sizeof (struct ts_calibration)))
271 retval = -EFAULT;
272 break;
273
274 default:
275 retval = -EINVAL;
276 break;
277 }
278
279 return retval;
280}
281
282static const struct file_operations tsdev_fops = {
283 .owner = THIS_MODULE,
284 .open = tsdev_open,
285 .release = tsdev_release,
286 .read = tsdev_read,
287 .poll = tsdev_poll,
288 .fasync = tsdev_fasync,
289 .ioctl = tsdev_ioctl,
290};
291
292static void tsdev_event(struct input_handle *handle, unsigned int type,
293 unsigned int code, int value)
294{
295 struct tsdev *tsdev = handle->private;
296 struct tsdev_client *client;
297 struct timeval time;
298
299 switch (type) {
300 case EV_ABS:
301 switch (code) {
302 case ABS_X:
303 tsdev->x = value;
304 break;
305
306 case ABS_Y:
307 tsdev->y = value;
308 break;
309
310 case ABS_PRESSURE:
311 if (value > handle->dev->absmax[ABS_PRESSURE])
312 value = handle->dev->absmax[ABS_PRESSURE];
313 value -= handle->dev->absmin[ABS_PRESSURE];
314 if (value < 0)
315 value = 0;
316 tsdev->pressure = value;
317 break;
318 }
319 break;
320
321 case EV_REL:
322 switch (code) {
323 case REL_X:
324 tsdev->x += value;
325 if (tsdev->x < 0)
326 tsdev->x = 0;
327 else if (tsdev->x > xres)
328 tsdev->x = xres;
329 break;
330
331 case REL_Y:
332 tsdev->y += value;
333 if (tsdev->y < 0)
334 tsdev->y = 0;
335 else if (tsdev->y > yres)
336 tsdev->y = yres;
337 break;
338 }
339 break;
340
341 case EV_KEY:
342 if (code == BTN_TOUCH || code == BTN_MOUSE) {
343 switch (value) {
344 case 0:
345 tsdev->pressure = 0;
346 break;
347
348 case 1:
349 if (!tsdev->pressure)
350 tsdev->pressure = 1;
351 break;
352 }
353 }
354 break;
355 }
356
357 if (type != EV_SYN || code != SYN_REPORT)
358 return;
359
360 list_for_each_entry(client, &tsdev->client_list, node) {
361 int x, y, tmp;
362
363 do_gettimeofday(&time);
364 client->event[client->head].millisecs = time.tv_usec / 100;
365 client->event[client->head].pressure = tsdev->pressure;
366
367 x = tsdev->x;
368 y = tsdev->y;
369
370 /* Calibration */
371 if (!client->raw) {
372 x = ((x * tsdev->cal.xscale) >> 8) + tsdev->cal.xtrans;
373 y = ((y * tsdev->cal.yscale) >> 8) + tsdev->cal.ytrans;
374 if (tsdev->cal.xyswap) {
375 tmp = x; x = y; y = tmp;
376 }
377 }
378
379 client->event[client->head].x = x;
380 client->event[client->head].y = y;
381 client->head = (client->head + 1) & (TSDEV_BUFFER_SIZE - 1);
382 kill_fasync(&client->fasync, SIGIO, POLL_IN);
383 }
384 wake_up_interruptible(&tsdev->wait);
385}
386
387static int tsdev_connect(struct input_handler *handler, struct input_dev *dev,
388 const struct input_device_id *id)
389{
390 struct tsdev *tsdev;
391 struct class_device *cdev;
392 dev_t devt;
393 int minor, delta;
394 int error;
395
396 for (minor = 0; minor < TSDEV_MINORS / 2 && tsdev_table[minor]; minor++);
397 if (minor >= TSDEV_MINORS / 2) {
398 printk(KERN_ERR
399 "tsdev: You have way too many touchscreens\n");
400 return -ENFILE;
401 }
402
403 tsdev = kzalloc(sizeof(struct tsdev), GFP_KERNEL);
404 if (!tsdev)
405 return -ENOMEM;
406
407 INIT_LIST_HEAD(&tsdev->client_list);
408 init_waitqueue_head(&tsdev->wait);
409
410 sprintf(tsdev->name, "ts%d", minor);
411
412 tsdev->exist = 1;
413 tsdev->minor = minor;
414 tsdev->handle.dev = dev;
415 tsdev->handle.name = tsdev->name;
416 tsdev->handle.handler = handler;
417 tsdev->handle.private = tsdev;
418
419 /* Precompute the rough calibration matrix */
420 delta = dev->absmax [ABS_X] - dev->absmin [ABS_X] + 1;
421 if (delta == 0)
422 delta = 1;
423 tsdev->cal.xscale = (xres << 8) / delta;
424 tsdev->cal.xtrans = - ((dev->absmin [ABS_X] * tsdev->cal.xscale) >> 8);
425
426 delta = dev->absmax [ABS_Y] - dev->absmin [ABS_Y] + 1;
427 if (delta == 0)
428 delta = 1;
429 tsdev->cal.yscale = (yres << 8) / delta;
430 tsdev->cal.ytrans = - ((dev->absmin [ABS_Y] * tsdev->cal.yscale) >> 8);
431
432 tsdev_table[minor] = tsdev;
433
434 devt = MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + minor),
435
436 cdev = class_device_create(&input_class, &dev->cdev, devt,
437 dev->cdev.dev, tsdev->name);
438 if (IS_ERR(cdev)) {
439 error = PTR_ERR(cdev);
440 goto err_free_tsdev;
441 }
442
443 /* temporary symlink to keep userspace happy */
444 error = sysfs_create_link(&input_class.subsys.kobj,
445 &cdev->kobj, tsdev->name);
446 if (error)
447 goto err_cdev_destroy;
448
449 error = input_register_handle(&tsdev->handle);
450 if (error)
451 goto err_remove_link;
452
453 return 0;
454
455 err_remove_link:
456 sysfs_remove_link(&input_class.subsys.kobj, tsdev->name);
457 err_cdev_destroy:
458 class_device_destroy(&input_class, devt);
459 err_free_tsdev:
460 tsdev_table[minor] = NULL;
461 kfree(tsdev);
462 return error;
463}
464
465static void tsdev_disconnect(struct input_handle *handle)
466{
467 struct tsdev *tsdev = handle->private;
468 struct tsdev_client *client;
469
470 input_unregister_handle(handle);
471
472 sysfs_remove_link(&input_class.subsys.kobj, tsdev->name);
473 class_device_destroy(&input_class,
474 MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + tsdev->minor));
475 tsdev->exist = 0;
476
477 if (tsdev->open) {
478 input_close_device(handle);
479 list_for_each_entry(client, &tsdev->client_list, node)
480 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
481 wake_up_interruptible(&tsdev->wait);
482 } else
483 tsdev_free(tsdev);
484}
485
486static const struct input_device_id tsdev_ids[] = {
487 {
488 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
489 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
490 .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) },
491 .relbit = { BIT(REL_X) | BIT(REL_Y) },
492 }, /* A mouse like device, at least one button, two relative axes */
493
494 {
495 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
496 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
497 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
498 .absbit = { BIT(ABS_X) | BIT(ABS_Y) },
499 }, /* A tablet like device, at least touch detection, two absolute axes */
500
501 {
502 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
503 .evbit = { BIT(EV_ABS) },
504 .absbit = { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) },
505 }, /* A tablet like device with several gradations of pressure */
506
507 {} /* Terminating entry */
508};
509
510MODULE_DEVICE_TABLE(input, tsdev_ids);
511
512static struct input_handler tsdev_handler = {
513 .event = tsdev_event,
514 .connect = tsdev_connect,
515 .disconnect = tsdev_disconnect,
516 .fops = &tsdev_fops,
517 .minor = TSDEV_MINOR_BASE,
518 .name = "tsdev",
519 .id_table = tsdev_ids,
520};
521
522static int __init tsdev_init(void)
523{
524 return input_register_handler(&tsdev_handler);
525}
526
527static void __exit tsdev_exit(void)
528{
529 input_unregister_handler(&tsdev_handler);
530}
531
532module_init(tsdev_init);
533module_exit(tsdev_exit);