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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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7 * is obsolete; for new programs use the tslib library which can read directly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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
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 <jsimmons@transvirtual.com>");
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 = 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
177static void tsdev_free(struct tsdev *tsdev)
178{
179 tsdev_table[tsdev->minor] = NULL;
180 kfree(tsdev);
181}
182
183static 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
200static 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 */
231static 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
239static 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
265static 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
275static 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
366static 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;
Greg Kroah-Hartmanc9bcd582005-10-27 22:25:43 -0700371 struct class_device *cdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 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
Greg Kroah-Hartmanc9bcd582005-10-27 22:25:43 -0700413 cdev = class_device_create(&input_class, &dev->cdev,
gregkh@suse.de12356862005-03-15 14:26:30 -0800414 MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + minor),
Greg Kroah-Hartmanc9bcd582005-10-27 22:25:43 -0700415 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
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
Greg Kroah-Hartmanc9bcd582005-10-27 22:25:43 -0700429 sysfs_remove_link(&input_class.subsys.kset.kobj, tsdev->name);
Greg Kroah-Hartmanea9f2402005-10-27 22:25:43 -0700430 class_device_destroy(&input_class,
gregkh@suse.de12356862005-03-15 14:26:30 -0800431 MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + tsdev->minor));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 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
443static 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
467MODULE_DEVICE_TABLE(input, tsdev_ids);
468
469static 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
479static 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
486static void __exit tsdev_exit(void)
487{
488 input_unregister_handler(&tsdev_handler);
489}
490
491module_init(tsdev_init);
492module_exit(tsdev_exit);