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1da177e4 LT |
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7 | * is obsolete; for new programs use the tslib library which can read directly | |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 <zap@homelink.ru> | |
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 <jsimmons@infradead.org>. | |
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> | |
1da177e4 LT |
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 | ||
81 | MODULE_AUTHOR("James Simmons <jsimmons@transvirtual.com>"); | |
82 | MODULE_DESCRIPTION("Input driver to touchscreen converter"); | |
83 | MODULE_LICENSE("GPL"); | |
84 | ||
85 | static int xres = CONFIG_INPUT_TSDEV_SCREEN_X; | |
86 | module_param(xres, uint, 0); | |
87 | MODULE_PARM_DESC(xres, "Horizontal screen resolution (can be negative for X-mirror)"); | |
88 | ||
89 | static int yres = CONFIG_INPUT_TSDEV_SCREEN_Y; | |
90 | module_param(yres, uint, 0); | |
91 | MODULE_PARM_DESC(yres, "Vertical screen resolution (can be negative for Y-mirror)"); | |
92 | ||
93 | /* From Compaq's Touch Screen Specification version 0.2 (draft) */ | |
94 | struct ts_event { | |
95 | short pressure; | |
96 | short x; | |
97 | short y; | |
98 | short millisecs; | |
99 | }; | |
100 | ||
101 | struct ts_calibration { | |
102 | int xscale; | |
103 | int xtrans; | |
104 | int yscale; | |
105 | int ytrans; | |
106 | int xyswap; | |
107 | }; | |
108 | ||
109 | struct 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 | ||
121 | struct 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 | ||
139 | static struct input_handler tsdev_handler; | |
140 | ||
141 | static struct tsdev *tsdev_table[TSDEV_MINORS/2]; | |
142 | ||
143 | static 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 | ||
152 | static 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 = kmalloc(sizeof(struct tsdev_list), GFP_KERNEL))) | |
161 | return -ENOMEM; | |
162 | memset(list, 0, sizeof(struct tsdev_list)); | |
163 | ||
164 | list->raw = (i >= TSDEV_MINORS/2) ? 1 : 0; | |
165 | ||
166 | i &= TSDEV_MINOR_MASK; | |
167 | list->tsdev = tsdev_table[i]; | |
168 | list_add_tail(&list->node, &tsdev_table[i]->list); | |
169 | file->private_data = list; | |
170 | ||
171 | if (!list->tsdev->open++) | |
172 | if (list->tsdev->exist) | |
173 | input_open_device(&list->tsdev->handle); | |
174 | return 0; | |
175 | } | |
176 | ||
177 | static void tsdev_free(struct tsdev *tsdev) | |
178 | { | |
179 | tsdev_table[tsdev->minor] = NULL; | |
180 | kfree(tsdev); | |
181 | } | |
182 | ||
183 | static int tsdev_release(struct inode *inode, struct file *file) | |
184 | { | |
185 | struct tsdev_list *list = file->private_data; | |
186 | ||
187 | tsdev_fasync(-1, file, 0); | |
188 | list_del(&list->node); | |
189 | ||
190 | if (!--list->tsdev->open) { | |
191 | if (list->tsdev->exist) | |
192 | input_close_device(&list->tsdev->handle); | |
193 | else | |
194 | tsdev_free(list->tsdev); | |
195 | } | |
196 | kfree(list); | |
197 | return 0; | |
198 | } | |
199 | ||
200 | static ssize_t tsdev_read(struct file *file, char __user *buffer, size_t count, | |
201 | loff_t * ppos) | |
202 | { | |
203 | struct tsdev_list *list = file->private_data; | |
204 | int retval = 0; | |
205 | ||
206 | if (list->head == list->tail && list->tsdev->exist && (file->f_flags & O_NONBLOCK)) | |
207 | return -EAGAIN; | |
208 | ||
209 | retval = wait_event_interruptible(list->tsdev->wait, | |
210 | list->head != list->tail || !list->tsdev->exist); | |
211 | ||
212 | if (retval) | |
213 | return retval; | |
214 | ||
215 | if (!list->tsdev->exist) | |
216 | return -ENODEV; | |
217 | ||
218 | while (list->head != list->tail && | |
219 | retval + sizeof (struct ts_event) <= count) { | |
220 | if (copy_to_user (buffer + retval, list->event + list->tail, | |
221 | sizeof (struct ts_event))) | |
222 | return -EFAULT; | |
223 | list->tail = (list->tail + 1) & (TSDEV_BUFFER_SIZE - 1); | |
224 | retval += sizeof (struct ts_event); | |
225 | } | |
226 | ||
227 | return retval; | |
228 | } | |
229 | ||
230 | /* No kernel lock - fine */ | |
231 | static unsigned int tsdev_poll(struct file *file, poll_table * wait) | |
232 | { | |
233 | struct tsdev_list *list = file->private_data; | |
234 | poll_wait(file, &list->tsdev->wait, wait); | |
235 | return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) | | |
236 | (list->tsdev->exist ? 0 : (POLLHUP | POLLERR)); | |
237 | } | |
238 | ||
239 | static int tsdev_ioctl(struct inode *inode, struct file *file, | |
240 | unsigned int cmd, unsigned long arg) | |
241 | { | |
242 | struct tsdev_list *list = file->private_data; | |
243 | struct tsdev *tsdev = list->tsdev; | |
244 | int retval = 0; | |
245 | ||
246 | switch (cmd) { | |
247 | case TS_GET_CAL: | |
248 | if (copy_to_user ((void __user *)arg, &tsdev->cal, | |
249 | sizeof (struct ts_calibration))) | |
250 | retval = -EFAULT; | |
251 | break; | |
252 | case TS_SET_CAL: | |
253 | if (copy_from_user (&tsdev->cal, (void __user *)arg, | |
254 | sizeof (struct ts_calibration))) | |
255 | retval = -EFAULT; | |
256 | break; | |
257 | default: | |
258 | retval = -EINVAL; | |
259 | break; | |
260 | } | |
261 | ||
262 | return retval; | |
263 | } | |
264 | ||
265 | static struct file_operations tsdev_fops = { | |
266 | .owner = THIS_MODULE, | |
267 | .open = tsdev_open, | |
268 | .release = tsdev_release, | |
269 | .read = tsdev_read, | |
270 | .poll = tsdev_poll, | |
271 | .fasync = tsdev_fasync, | |
272 | .ioctl = tsdev_ioctl, | |
273 | }; | |
274 | ||
275 | static void tsdev_event(struct input_handle *handle, unsigned int type, | |
276 | unsigned int code, int value) | |
277 | { | |
278 | struct tsdev *tsdev = handle->private; | |
279 | struct tsdev_list *list; | |
280 | struct timeval time; | |
281 | ||
282 | switch (type) { | |
283 | case EV_ABS: | |
284 | switch (code) { | |
285 | case ABS_X: | |
286 | tsdev->x = value; | |
287 | break; | |
288 | case ABS_Y: | |
289 | tsdev->y = value; | |
290 | break; | |
291 | case ABS_PRESSURE: | |
292 | if (value > handle->dev->absmax[ABS_PRESSURE]) | |
293 | value = handle->dev->absmax[ABS_PRESSURE]; | |
294 | value -= handle->dev->absmin[ABS_PRESSURE]; | |
295 | if (value < 0) | |
296 | value = 0; | |
297 | tsdev->pressure = value; | |
298 | break; | |
299 | } | |
300 | break; | |
301 | ||
302 | case EV_REL: | |
303 | switch (code) { | |
304 | case REL_X: | |
305 | tsdev->x += value; | |
306 | if (tsdev->x < 0) | |
307 | tsdev->x = 0; | |
308 | else if (tsdev->x > xres) | |
309 | tsdev->x = xres; | |
310 | break; | |
311 | case REL_Y: | |
312 | tsdev->y += value; | |
313 | if (tsdev->y < 0) | |
314 | tsdev->y = 0; | |
315 | else if (tsdev->y > yres) | |
316 | tsdev->y = yres; | |
317 | break; | |
318 | } | |
319 | break; | |
320 | ||
321 | case EV_KEY: | |
322 | if (code == BTN_TOUCH || code == BTN_MOUSE) { | |
323 | switch (value) { | |
324 | case 0: | |
325 | tsdev->pressure = 0; | |
326 | break; | |
327 | case 1: | |
328 | if (!tsdev->pressure) | |
329 | tsdev->pressure = 1; | |
330 | break; | |
331 | } | |
332 | } | |
333 | break; | |
334 | } | |
335 | ||
336 | if (type != EV_SYN || code != SYN_REPORT) | |
337 | return; | |
338 | ||
339 | list_for_each_entry(list, &tsdev->list, node) { | |
340 | int x, y, tmp; | |
341 | ||
342 | do_gettimeofday(&time); | |
343 | list->event[list->head].millisecs = time.tv_usec / 100; | |
344 | list->event[list->head].pressure = tsdev->pressure; | |
345 | ||
346 | x = tsdev->x; | |
347 | y = tsdev->y; | |
348 | ||
349 | /* Calibration */ | |
350 | if (!list->raw) { | |
351 | x = ((x * tsdev->cal.xscale) >> 8) + tsdev->cal.xtrans; | |
352 | y = ((y * tsdev->cal.yscale) >> 8) + tsdev->cal.ytrans; | |
353 | if (tsdev->cal.xyswap) { | |
354 | tmp = x; x = y; y = tmp; | |
355 | } | |
356 | } | |
357 | ||
358 | list->event[list->head].x = x; | |
359 | list->event[list->head].y = y; | |
360 | list->head = (list->head + 1) & (TSDEV_BUFFER_SIZE - 1); | |
361 | kill_fasync(&list->fasync, SIGIO, POLL_IN); | |
362 | } | |
363 | wake_up_interruptible(&tsdev->wait); | |
364 | } | |
365 | ||
366 | static struct input_handle *tsdev_connect(struct input_handler *handler, | |
367 | struct input_dev *dev, | |
368 | struct input_device_id *id) | |
369 | { | |
370 | struct tsdev *tsdev; | |
c9bcd582 | 371 | struct class_device *cdev; |
1da177e4 LT |
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 | ||
c9bcd582 | 413 | cdev = class_device_create(&input_class, &dev->cdev, |
1235686f | 414 | MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + minor), |
c9bcd582 GKH |
415 | dev->cdev.dev, tsdev->name); |
416 | ||
417 | /* temporary symlink to keep userspace happy */ | |
418 | sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj, | |
419 | tsdev->name); | |
1da177e4 LT |
420 | |
421 | return &tsdev->handle; | |
422 | } | |
423 | ||
424 | static void tsdev_disconnect(struct input_handle *handle) | |
425 | { | |
426 | struct tsdev *tsdev = handle->private; | |
427 | struct tsdev_list *list; | |
428 | ||
c9bcd582 | 429 | sysfs_remove_link(&input_class.subsys.kset.kobj, tsdev->name); |
ea9f240b | 430 | class_device_destroy(&input_class, |
1235686f | 431 | MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + tsdev->minor)); |
1da177e4 LT |
432 | tsdev->exist = 0; |
433 | ||
434 | if (tsdev->open) { | |
435 | input_close_device(handle); | |
436 | wake_up_interruptible(&tsdev->wait); | |
437 | list_for_each_entry(list, &tsdev->list, node) | |
438 | kill_fasync(&list->fasync, SIGIO, POLL_HUP); | |
439 | } else | |
440 | tsdev_free(tsdev); | |
441 | } | |
442 | ||
443 | static struct input_device_id tsdev_ids[] = { | |
444 | { | |
445 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_RELBIT, | |
446 | .evbit = { BIT(EV_KEY) | BIT(EV_REL) }, | |
447 | .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) }, | |
448 | .relbit = { BIT(REL_X) | BIT(REL_Y) }, | |
449 | },/* A mouse like device, at least one button, two relative axes */ | |
450 | ||
451 | { | |
452 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, | |
453 | .evbit = { BIT(EV_KEY) | BIT(EV_ABS) }, | |
454 | .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) }, | |
455 | .absbit = { BIT(ABS_X) | BIT(ABS_Y) }, | |
456 | },/* A tablet like device, at least touch detection, two absolute axes */ | |
457 | ||
458 | { | |
459 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, | |
460 | .evbit = { BIT(EV_ABS) }, | |
461 | .absbit = { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) }, | |
462 | },/* A tablet like device with several gradations of pressure */ | |
463 | ||
464 | {},/* Terminating entry */ | |
465 | }; | |
466 | ||
467 | MODULE_DEVICE_TABLE(input, tsdev_ids); | |
468 | ||
469 | static struct input_handler tsdev_handler = { | |
470 | .event = tsdev_event, | |
471 | .connect = tsdev_connect, | |
472 | .disconnect = tsdev_disconnect, | |
473 | .fops = &tsdev_fops, | |
474 | .minor = TSDEV_MINOR_BASE, | |
475 | .name = "tsdev", | |
476 | .id_table = tsdev_ids, | |
477 | }; | |
478 | ||
479 | static int __init tsdev_init(void) | |
480 | { | |
481 | input_register_handler(&tsdev_handler); | |
482 | printk(KERN_INFO "ts: Compaq touchscreen protocol output\n"); | |
483 | return 0; | |
484 | } | |
485 | ||
486 | static void __exit tsdev_exit(void) | |
487 | { | |
488 | input_unregister_handler(&tsdev_handler); | |
489 | } | |
490 | ||
491 | module_init(tsdev_init); | |
492 | module_exit(tsdev_exit); |