Linux 2.6.19-rc1
[linux-2.6/next.git] / drivers / input / tsdev.c
bloba730c461227f78608d8c461195f33b80f11210fb
1 /*
2 * $Id: tsdev.c,v 1.15 2002/04/10 16:50:19 jsimmons Exp $
4 * Copyright (c) 2001 "Crazy" james Simmons
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7 * is obsolete; for new programs use the tslib library which can read directly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.
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.
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.
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.
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
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>.
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
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>
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
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.
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.
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.
80 MODULE_AUTHOR("James Simmons <jsimmons@transvirtual.com>");
81 MODULE_DESCRIPTION("Input driver to touchscreen converter");
82 MODULE_LICENSE("GPL");
84 static int xres = CONFIG_INPUT_TSDEV_SCREEN_X;
85 module_param(xres, uint, 0);
86 MODULE_PARM_DESC(xres, "Horizontal screen resolution (can be negative for X-mirror)");
88 static int yres = CONFIG_INPUT_TSDEV_SCREEN_Y;
89 module_param(yres, uint, 0);
90 MODULE_PARM_DESC(yres, "Vertical screen resolution (can be negative for Y-mirror)");
92 /* From Compaq's Touch Screen Specification version 0.2 (draft) */
93 struct ts_event {
94 short pressure;
95 short x;
96 short y;
97 short millisecs;
100 struct ts_calibration {
101 int xscale;
102 int xtrans;
103 int yscale;
104 int ytrans;
105 int xyswap;
108 struct 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;
120 struct 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;
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.
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)
138 static struct tsdev *tsdev_table[TSDEV_MINORS/2];
140 static int tsdev_fasync(int fd, struct file *file, int on)
142 struct tsdev_list *list = file->private_data;
143 int retval;
145 retval = fasync_helper(fd, file, on, &list->fasync);
146 return retval < 0 ? retval : 0;
149 static int tsdev_open(struct inode *inode, struct file *file)
151 int i = iminor(inode) - TSDEV_MINOR_BASE;
152 struct tsdev_list *list;
154 if (i >= TSDEV_MINORS || !tsdev_table[i & TSDEV_MINOR_MASK])
155 return -ENODEV;
157 if (!(list = kzalloc(sizeof(struct tsdev_list), GFP_KERNEL)))
158 return -ENOMEM;
160 list->raw = (i >= TSDEV_MINORS/2) ? 1 : 0;
162 i &= TSDEV_MINOR_MASK;
163 list->tsdev = tsdev_table[i];
164 list_add_tail(&list->node, &tsdev_table[i]->list);
165 file->private_data = list;
167 if (!list->tsdev->open++)
168 if (list->tsdev->exist)
169 input_open_device(&list->tsdev->handle);
170 return 0;
173 static void tsdev_free(struct tsdev *tsdev)
175 tsdev_table[tsdev->minor] = NULL;
176 kfree(tsdev);
179 static int tsdev_release(struct inode *inode, struct file *file)
181 struct tsdev_list *list = file->private_data;
183 tsdev_fasync(-1, file, 0);
184 list_del(&list->node);
186 if (!--list->tsdev->open) {
187 if (list->tsdev->exist)
188 input_close_device(&list->tsdev->handle);
189 else
190 tsdev_free(list->tsdev);
192 kfree(list);
193 return 0;
196 static ssize_t tsdev_read(struct file *file, char __user *buffer, size_t count,
197 loff_t * ppos)
199 struct tsdev_list *list = file->private_data;
200 int retval = 0;
202 if (list->head == list->tail && list->tsdev->exist && (file->f_flags & O_NONBLOCK))
203 return -EAGAIN;
205 retval = wait_event_interruptible(list->tsdev->wait,
206 list->head != list->tail || !list->tsdev->exist);
208 if (retval)
209 return retval;
211 if (!list->tsdev->exist)
212 return -ENODEV;
214 while (list->head != list->tail &&
215 retval + sizeof (struct ts_event) <= count) {
216 if (copy_to_user (buffer + retval, list->event + list->tail,
217 sizeof (struct ts_event)))
218 return -EFAULT;
219 list->tail = (list->tail + 1) & (TSDEV_BUFFER_SIZE - 1);
220 retval += sizeof (struct ts_event);
223 return retval;
226 /* No kernel lock - fine */
227 static unsigned int tsdev_poll(struct file *file, poll_table * wait)
229 struct tsdev_list *list = file->private_data;
231 poll_wait(file, &list->tsdev->wait, wait);
232 return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) |
233 (list->tsdev->exist ? 0 : (POLLHUP | POLLERR));
236 static int tsdev_ioctl(struct inode *inode, struct file *file,
237 unsigned int cmd, unsigned long arg)
239 struct tsdev_list *list = file->private_data;
240 struct tsdev *tsdev = list->tsdev;
241 int retval = 0;
243 switch (cmd) {
244 case TS_GET_CAL:
245 if (copy_to_user ((void __user *)arg, &tsdev->cal,
246 sizeof (struct ts_calibration)))
247 retval = -EFAULT;
248 break;
250 case TS_SET_CAL:
251 if (copy_from_user (&tsdev->cal, (void __user *)arg,
252 sizeof (struct ts_calibration)))
253 retval = -EFAULT;
254 break;
256 default:
257 retval = -EINVAL;
258 break;
261 return retval;
264 static const 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,
274 static void tsdev_event(struct input_handle *handle, unsigned int type,
275 unsigned int code, int value)
277 struct tsdev *tsdev = handle->private;
278 struct tsdev_list *list;
279 struct timeval time;
281 switch (type) {
282 case EV_ABS:
283 switch (code) {
284 case ABS_X:
285 tsdev->x = value;
286 break;
288 case ABS_Y:
289 tsdev->y = value;
290 break;
292 case ABS_PRESSURE:
293 if (value > handle->dev->absmax[ABS_PRESSURE])
294 value = handle->dev->absmax[ABS_PRESSURE];
295 value -= handle->dev->absmin[ABS_PRESSURE];
296 if (value < 0)
297 value = 0;
298 tsdev->pressure = value;
299 break;
301 break;
303 case EV_REL:
304 switch (code) {
305 case REL_X:
306 tsdev->x += value;
307 if (tsdev->x < 0)
308 tsdev->x = 0;
309 else if (tsdev->x > xres)
310 tsdev->x = xres;
311 break;
313 case REL_Y:
314 tsdev->y += value;
315 if (tsdev->y < 0)
316 tsdev->y = 0;
317 else if (tsdev->y > yres)
318 tsdev->y = yres;
319 break;
321 break;
323 case EV_KEY:
324 if (code == BTN_TOUCH || code == BTN_MOUSE) {
325 switch (value) {
326 case 0:
327 tsdev->pressure = 0;
328 break;
330 case 1:
331 if (!tsdev->pressure)
332 tsdev->pressure = 1;
333 break;
336 break;
339 if (type != EV_SYN || code != SYN_REPORT)
340 return;
342 list_for_each_entry(list, &tsdev->list, node) {
343 int x, y, tmp;
345 do_gettimeofday(&time);
346 list->event[list->head].millisecs = time.tv_usec / 100;
347 list->event[list->head].pressure = tsdev->pressure;
349 x = tsdev->x;
350 y = tsdev->y;
352 /* Calibration */
353 if (!list->raw) {
354 x = ((x * tsdev->cal.xscale) >> 8) + tsdev->cal.xtrans;
355 y = ((y * tsdev->cal.yscale) >> 8) + tsdev->cal.ytrans;
356 if (tsdev->cal.xyswap) {
357 tmp = x; x = y; y = tmp;
361 list->event[list->head].x = x;
362 list->event[list->head].y = y;
363 list->head = (list->head + 1) & (TSDEV_BUFFER_SIZE - 1);
364 kill_fasync(&list->fasync, SIGIO, POLL_IN);
366 wake_up_interruptible(&tsdev->wait);
369 static struct input_handle *tsdev_connect(struct input_handler *handler,
370 struct input_dev *dev,
371 const struct input_device_id *id)
373 struct tsdev *tsdev;
374 struct class_device *cdev;
375 int minor, delta;
377 for (minor = 0; minor < TSDEV_MINORS / 2 && tsdev_table[minor]; minor++);
378 if (minor >= TSDEV_MINORS / 2) {
379 printk(KERN_ERR
380 "tsdev: You have way too many touchscreens\n");
381 return NULL;
384 if (!(tsdev = kzalloc(sizeof(struct tsdev), GFP_KERNEL)))
385 return NULL;
387 INIT_LIST_HEAD(&tsdev->list);
388 init_waitqueue_head(&tsdev->wait);
390 sprintf(tsdev->name, "ts%d", minor);
392 tsdev->exist = 1;
393 tsdev->minor = minor;
394 tsdev->handle.dev = dev;
395 tsdev->handle.name = tsdev->name;
396 tsdev->handle.handler = handler;
397 tsdev->handle.private = tsdev;
399 /* Precompute the rough calibration matrix */
400 delta = dev->absmax [ABS_X] - dev->absmin [ABS_X] + 1;
401 if (delta == 0)
402 delta = 1;
403 tsdev->cal.xscale = (xres << 8) / delta;
404 tsdev->cal.xtrans = - ((dev->absmin [ABS_X] * tsdev->cal.xscale) >> 8);
406 delta = dev->absmax [ABS_Y] - dev->absmin [ABS_Y] + 1;
407 if (delta == 0)
408 delta = 1;
409 tsdev->cal.yscale = (yres << 8) / delta;
410 tsdev->cal.ytrans = - ((dev->absmin [ABS_Y] * tsdev->cal.yscale) >> 8);
412 tsdev_table[minor] = tsdev;
414 cdev = class_device_create(&input_class, &dev->cdev,
415 MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + minor),
416 dev->cdev.dev, tsdev->name);
418 /* temporary symlink to keep userspace happy */
419 sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj,
420 tsdev->name);
422 return &tsdev->handle;
425 static void tsdev_disconnect(struct input_handle *handle)
427 struct tsdev *tsdev = handle->private;
428 struct tsdev_list *list;
430 sysfs_remove_link(&input_class.subsys.kset.kobj, tsdev->name);
431 class_device_destroy(&input_class,
432 MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + tsdev->minor));
433 tsdev->exist = 0;
435 if (tsdev->open) {
436 input_close_device(handle);
437 wake_up_interruptible(&tsdev->wait);
438 list_for_each_entry(list, &tsdev->list, node)
439 kill_fasync(&list->fasync, SIGIO, POLL_HUP);
440 } else
441 tsdev_free(tsdev);
444 static const struct input_device_id tsdev_ids[] = {
446 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
447 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
448 .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) },
449 .relbit = { BIT(REL_X) | BIT(REL_Y) },
450 }, /* A mouse like device, at least one button, two relative axes */
453 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
454 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
455 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
456 .absbit = { BIT(ABS_X) | BIT(ABS_Y) },
457 }, /* A tablet like device, at least touch detection, two absolute axes */
460 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
461 .evbit = { BIT(EV_ABS) },
462 .absbit = { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) },
463 }, /* A tablet like device with several gradations of pressure */
465 {} /* Terminating entry */
468 MODULE_DEVICE_TABLE(input, tsdev_ids);
470 static struct input_handler tsdev_handler = {
471 .event = tsdev_event,
472 .connect = tsdev_connect,
473 .disconnect = tsdev_disconnect,
474 .fops = &tsdev_fops,
475 .minor = TSDEV_MINOR_BASE,
476 .name = "tsdev",
477 .id_table = tsdev_ids,
480 static int __init tsdev_init(void)
482 return input_register_handler(&tsdev_handler);
485 static void __exit tsdev_exit(void)
487 input_unregister_handler(&tsdev_handler);
490 module_init(tsdev_init);
491 module_exit(tsdev_exit);