projects/linux·blob v2.6.17 · 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7 * is obsolete; for new programs use the tslib library which can read directly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
57#ifndef CONFIG_INPUT_TSDEV_SCREEN_X
58#define CONFIG_INPUT_TSDEV_SCREEN_X 240
59#endif
60#ifndef CONFIG_INPUT_TSDEV_SCREEN_Y
61#define CONFIG_INPUT_TSDEV_SCREEN_Y 320
62#endif
63
64/* This driver emulates both protocols of the old h3600_ts and h3600_tsraw
65 * devices. The first one must output X/Y data in 'cooked' format, e.g.
66 * filtered, dejittered and calibrated. Second device just outputs raw
67 * data received from the hardware.
68 *
69 * This driver doesn't support filtering and dejittering; it supports only
70 * calibration. Filtering and dejittering must be done in the low-level
71 * driver, if needed, because it may gain additional benefits from knowing
72 * the low-level details, the nature of noise and so on.
73 *
74 * The driver precomputes a calibration matrix given the initial xres and
75 * yres values (quite innacurate for most touchscreens) that will result
76 * in a more or less expected range of output values. The driver supports
77 * the TS_SET_CAL ioctl, which will replace the calibration matrix with a
78 * new one, supposedly generated from the values taken from the raw device.
79 */
80
81MODULE_AUTHOR("James Simmons <[email protected]>");
82MODULE_DESCRIPTION("Input driver to touchscreen converter");
83MODULE_LICENSE("GPL");
84
85static int xres = CONFIG_INPUT_TSDEV_SCREEN_X;
86module_param(xres, uint, 0);
87MODULE_PARM_DESC(xres, "Horizontal screen resolution (can be negative for X-mirror)");
88
89static int yres = CONFIG_INPUT_TSDEV_SCREEN_Y;
90module_param(yres, uint, 0);
91MODULE_PARM_DESC(yres, "Vertical screen resolution (can be negative for Y-mirror)");
92
93/* From Compaq's Touch Screen Specification version 0.2 (draft) */
94struct ts_event {
95 short pressure;
96 short x;
97 short y;
98 short millisecs;
99};
100
101struct ts_calibration {
102 int xscale;
103 int xtrans;
104 int yscale;
105 int ytrans;
106 int xyswap;
107};
108
109struct tsdev {
110 int exist;
111 int open;
112 int minor;
113 char name[8];
114 wait_queue_head_t wait;
115 struct list_head list;
116 struct input_handle handle;
117 int x, y, pressure;
118 struct ts_calibration cal;
119};
120
121struct tsdev_list {
122 struct fasync_struct *fasync;
123 struct list_head node;
124 struct tsdev *tsdev;
125 int head, tail;
126 struct ts_event event[TSDEV_BUFFER_SIZE];
127 int raw;
128};
129
130/* The following ioctl codes are defined ONLY for backward compatibility.
131 * Don't use tsdev for new developement; use the tslib library instead.
132 * Touchscreen calibration is a fully userspace task.
133 */
134/* Use 'f' as magic number */
135#define IOC_H3600_TS_MAGIC 'f'
136#define TS_GET_CAL _IOR(IOC_H3600_TS_MAGIC, 10, struct ts_calibration)
137#define TS_SET_CAL _IOW(IOC_H3600_TS_MAGIC, 11, struct ts_calibration)
138
139static struct input_handler tsdev_handler;
140
141static struct tsdev *tsdev_table[TSDEV_MINORS/2];
142
143static int tsdev_fasync(int fd, struct file *file, int on)
144{
145 struct tsdev_list *list = file->private_data;
146 int retval;
147
148 retval = fasync_helper(fd, file, on, &list->fasync);
149 return retval < 0 ? retval : 0;
150}
151
152static int tsdev_open(struct inode *inode, struct file *file)
153{
154 int i = iminor(inode) - TSDEV_MINOR_BASE;
155 struct tsdev_list *list;
156
157 if (i >= TSDEV_MINORS || !tsdev_table[i & TSDEV_MINOR_MASK])
158 return -ENODEV;
159
160 if (!(list = kzalloc(sizeof(struct tsdev_list), GFP_KERNEL)))
161 return -ENOMEM;
162
163 list->raw = (i >= TSDEV_MINORS/2) ? 1 : 0;
164
165 i &= TSDEV_MINOR_MASK;
166 list->tsdev = tsdev_table[i];
167 list_add_tail(&list->node, &tsdev_table[i]->list);
168 file->private_data = list;
169
170 if (!list->tsdev->open++)
171 if (list->tsdev->exist)
172 input_open_device(&list->tsdev->handle);
173 return 0;
174}
175
176static void tsdev_free(struct tsdev *tsdev)
177{
178 tsdev_table[tsdev->minor] = NULL;
179 kfree(tsdev);
180}
181
182static int tsdev_release(struct inode *inode, struct file *file)
183{
184 struct tsdev_list *list = file->private_data;
185
186 tsdev_fasync(-1, file, 0);
187 list_del(&list->node);
188
189 if (!--list->tsdev->open) {
190 if (list->tsdev->exist)
191 input_close_device(&list->tsdev->handle);
192 else
193 tsdev_free(list->tsdev);
194 }
195 kfree(list);
196 return 0;
197}
198
199static ssize_t tsdev_read(struct file *file, char __user *buffer, size_t count,
200 loff_t * ppos)
201{
202 struct tsdev_list *list = file->private_data;
203 int retval = 0;
204
205 if (list->head == list->tail && list->tsdev->exist && (file->f_flags & O_NONBLOCK))
206 return -EAGAIN;
207
208 retval = wait_event_interruptible(list->tsdev->wait,
209 list->head != list->tail || !list->tsdev->exist);
210
211 if (retval)
212 return retval;
213
214 if (!list->tsdev->exist)
215 return -ENODEV;
216
217 while (list->head != list->tail &&
218 retval + sizeof (struct ts_event) <= count) {
219 if (copy_to_user (buffer + retval, list->event + list->tail,
220 sizeof (struct ts_event)))
221 return -EFAULT;
222 list->tail = (list->tail + 1) & (TSDEV_BUFFER_SIZE - 1);
223 retval += sizeof (struct ts_event);
224 }
225
226 return retval;
227}
228
229/* No kernel lock - fine */
230static unsigned int tsdev_poll(struct file *file, poll_table * wait)
231{
232 struct tsdev_list *list = file->private_data;
233 poll_wait(file, &list->tsdev->wait, wait);
234 return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) |
235 (list->tsdev->exist ? 0 : (POLLHUP | POLLERR));
236}
237
238static int tsdev_ioctl(struct inode *inode, struct file *file,
239 unsigned int cmd, unsigned long arg)
240{
241 struct tsdev_list *list = file->private_data;
242 struct tsdev *tsdev = list->tsdev;
243 int retval = 0;
244
245 switch (cmd) {
246 case TS_GET_CAL:
247 if (copy_to_user ((void __user *)arg, &tsdev->cal,
248 sizeof (struct ts_calibration)))
249 retval = -EFAULT;
250 break;
251 case TS_SET_CAL:
252 if (copy_from_user (&tsdev->cal, (void __user *)arg,
253 sizeof (struct ts_calibration)))
254 retval = -EFAULT;
255 break;
256 default:
257 retval = -EINVAL;
258 break;
259 }
260
261 return retval;
262}
263
264static struct file_operations tsdev_fops = {
265 .owner = THIS_MODULE,
266 .open = tsdev_open,
267 .release = tsdev_release,
268 .read = tsdev_read,
269 .poll = tsdev_poll,
270 .fasync = tsdev_fasync,
271 .ioctl = tsdev_ioctl,
272};
273
274static void tsdev_event(struct input_handle *handle, unsigned int type,
275 unsigned int code, int value)
276{
277 struct tsdev *tsdev = handle->private;
278 struct tsdev_list *list;
279 struct timeval time;
280
281 switch (type) {
282 case EV_ABS:
283 switch (code) {
284 case ABS_X:
285 tsdev->x = value;
286 break;
287 case ABS_Y:
288 tsdev->y = value;
289 break;
290 case ABS_PRESSURE:
291 if (value > handle->dev->absmax[ABS_PRESSURE])
292 value = handle->dev->absmax[ABS_PRESSURE];
293 value -= handle->dev->absmin[ABS_PRESSURE];
294 if (value < 0)
295 value = 0;
296 tsdev->pressure = value;
297 break;
298 }
299 break;
300
301 case EV_REL:
302 switch (code) {
303 case REL_X:
304 tsdev->x += value;
305 if (tsdev->x < 0)
306 tsdev->x = 0;
307 else if (tsdev->x > xres)
308 tsdev->x = xres;
309 break;
310 case REL_Y:
311 tsdev->y += value;
312 if (tsdev->y < 0)
313 tsdev->y = 0;
314 else if (tsdev->y > yres)
315 tsdev->y = yres;
316 break;
317 }
318 break;
319
320 case EV_KEY:
321 if (code == BTN_TOUCH || code == BTN_MOUSE) {
322 switch (value) {
323 case 0:
324 tsdev->pressure = 0;
325 break;
326 case 1:
327 if (!tsdev->pressure)
328 tsdev->pressure = 1;
329 break;
330 }
331 }
332 break;
333 }
334
335 if (type != EV_SYN || code != SYN_REPORT)
336 return;
337
338 list_for_each_entry(list, &tsdev->list, node) {
339 int x, y, tmp;
340
341 do_gettimeofday(&time);
342 list->event[list->head].millisecs = time.tv_usec / 100;
343 list->event[list->head].pressure = tsdev->pressure;
344
345 x = tsdev->x;
346 y = tsdev->y;
347
348 /* Calibration */
349 if (!list->raw) {
350 x = ((x * tsdev->cal.xscale) >> 8) + tsdev->cal.xtrans;
351 y = ((y * tsdev->cal.yscale) >> 8) + tsdev->cal.ytrans;
352 if (tsdev->cal.xyswap) {
353 tmp = x; x = y; y = tmp;
354 }
355 }
356
357 list->event[list->head].x = x;
358 list->event[list->head].y = y;
359 list->head = (list->head + 1) & (TSDEV_BUFFER_SIZE - 1);
360 kill_fasync(&list->fasync, SIGIO, POLL_IN);
361 }
362 wake_up_interruptible(&tsdev->wait);
363}
364
365static struct input_handle *tsdev_connect(struct input_handler *handler,
366 struct input_dev *dev,
367 struct input_device_id *id)
368{
369 struct tsdev *tsdev;
370 struct class_device *cdev;
371 int minor, delta;
372
373 for (minor = 0; minor < TSDEV_MINORS/2 && tsdev_table[minor];
374 minor++);
375 if (minor >= TSDEV_MINORS/2) {
376 printk(KERN_ERR
377 "tsdev: You have way too many touchscreens\n");
378 return NULL;
379 }
380
381 if (!(tsdev = kzalloc(sizeof(struct tsdev), GFP_KERNEL)))
382 return NULL;
383
384 INIT_LIST_HEAD(&tsdev->list);
385 init_waitqueue_head(&tsdev->wait);
386
387 sprintf(tsdev->name, "ts%d", minor);
388
389 tsdev->exist = 1;
390 tsdev->minor = minor;
391 tsdev->handle.dev = dev;
392 tsdev->handle.name = tsdev->name;
393 tsdev->handle.handler = handler;
394 tsdev->handle.private = tsdev;
395
396 /* Precompute the rough calibration matrix */
397 delta = dev->absmax [ABS_X] - dev->absmin [ABS_X] + 1;
398 if (delta == 0)
399 delta = 1;
400 tsdev->cal.xscale = (xres << 8) / delta;
401 tsdev->cal.xtrans = - ((dev->absmin [ABS_X] * tsdev->cal.xscale) >> 8);
402
403 delta = dev->absmax [ABS_Y] - dev->absmin [ABS_Y] + 1;
404 if (delta == 0)
405 delta = 1;
406 tsdev->cal.yscale = (yres << 8) / delta;
407 tsdev->cal.ytrans = - ((dev->absmin [ABS_Y] * tsdev->cal.yscale) >> 8);
408
409 tsdev_table[minor] = tsdev;
410
411 cdev = class_device_create(&input_class, &dev->cdev,
412 MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + minor),
413 dev->cdev.dev, tsdev->name);
414
415 /* temporary symlink to keep userspace happy */
416 sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj,
417 tsdev->name);
418
419 return &tsdev->handle;
420}
421
422static void tsdev_disconnect(struct input_handle *handle)
423{
424 struct tsdev *tsdev = handle->private;
425 struct tsdev_list *list;
426
427 sysfs_remove_link(&input_class.subsys.kset.kobj, tsdev->name);
428 class_device_destroy(&input_class,
429 MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + tsdev->minor));
430 tsdev->exist = 0;
431
432 if (tsdev->open) {
433 input_close_device(handle);
434 wake_up_interruptible(&tsdev->wait);
435 list_for_each_entry(list, &tsdev->list, node)
436 kill_fasync(&list->fasync, SIGIO, POLL_HUP);
437 } else
438 tsdev_free(tsdev);
439}
440
441static struct input_device_id tsdev_ids[] = {
442 {
443 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
444 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
445 .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) },
446 .relbit = { BIT(REL_X) | BIT(REL_Y) },
447 },/* A mouse like device, at least one button, two relative axes */
448
449 {
450 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
451 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
452 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
453 .absbit = { BIT(ABS_X) | BIT(ABS_Y) },
454 },/* A tablet like device, at least touch detection, two absolute axes */
455
456 {
457 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
458 .evbit = { BIT(EV_ABS) },
459 .absbit = { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) },
460 },/* A tablet like device with several gradations of pressure */
461
462 {},/* Terminating entry */
463};
464
465MODULE_DEVICE_TABLE(input, tsdev_ids);
466
467static struct input_handler tsdev_handler = {
468 .event = tsdev_event,
469 .connect = tsdev_connect,
470 .disconnect = tsdev_disconnect,
471 .fops = &tsdev_fops,
472 .minor = TSDEV_MINOR_BASE,
473 .name = "tsdev",
474 .id_table = tsdev_ids,
475};
476
477static int __init tsdev_init(void)
478{
479 input_register_handler(&tsdev_handler);
480 printk(KERN_INFO "ts: Compaq touchscreen protocol output\n");
481 return 0;
482}
483
484static void __exit tsdev_exit(void)
485{
486 input_unregister_handler(&tsdev_handler);
487}
488
489module_init(tsdev_init);
490module_exit(tsdev_exit);