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7 * is obsolete; for new programs use the tslib library which can read directly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