2 * Driver for DEC VSXXX-AA mouse (hockey-puck mouse, ball or two rollers)
3 * DEC VSXXX-GA mouse (rectangular mouse, with ball)
4 * DEC VSXXX-AB tablet (digitizer with hair cross or stylus)
6 * Copyright (C) 2003-2004 by Jan-Benedict Glaw <jbglaw@lug-owl.de>
8 * The packet format was initially taken from a patch to GPM which is (C) 2001
9 * by Karsten Merker <merker@linuxtag.org>
10 * and Maciej W. Rozycki <macro@ds2.pg.gda.pl>
11 * Later on, I had access to the device's documentation (referenced below).
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31 * Building an adaptor to DE9 / DB25 RS232
32 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
34 * DISCLAIMER: Use this description AT YOUR OWN RISK! I'll not pay for
35 * anything if you break your mouse, your computer or whatever!
37 * In theory, this mouse is a simple RS232 device. In practice, it has got
38 * a quite uncommon plug and the requirement to additionally get a power
39 * supply at +5V and -12V.
41 * If you look at the socket/jack (_not_ at the plug), we use this pin
49 * DEC socket DE9 DB25 Note
53 * 4 (-12V) - - Somewhere from the PSU. At ATX, it's
54 * the thin blue wire at pin 12 of the
55 * ATX power connector. Only required for
57 * 5 (+5V) - - PSU (red wires of ATX power connector
58 * on pin 4, 6, 19 or 20) or HDD power
59 * connector (also red wire).
60 * 6 (+12V) - - HDD power connector, yellow wire. Only
61 * required for VSXXX-AB digitizer.
62 * 7 (dev. avail.) - - The mouse shorts this one to pin 1.
63 * This way, the host computer can detect
64 * the mouse. To use it with the adaptor,
65 * simply don't connect this pin.
67 * So to get a working adaptor, you need to connect the mouse with three
68 * wires to a RS232 port and two or three additional wires for +5V, +12V and
71 * Flow specification for the link is 4800, 8o1.
73 * The mice and tablet are described in "VCB02 Video Subsystem - Technical
74 * Manual", DEC EK-104AA-TM-001. You'll find it at MANX, a search engine
75 * specific for DEC documentation. Try
76 * http://www.vt100.net/manx/details?pn=EK-104AA-TM-001;id=21;cp=1
79 #include <linux/delay.h>
80 #include <linux/module.h>
81 #include <linux/slab.h>
82 #include <linux/interrupt.h>
83 #include <linux/input.h>
84 #include <linux/serio.h>
85 #include <linux/init.h>
87 #define DRIVER_DESC "Driver for DEC VSXXX-AA and -GA mice and VSXXX-AB tablet"
89 MODULE_AUTHOR("Jan-Benedict Glaw <jbglaw@lug-owl.de>");
90 MODULE_DESCRIPTION(DRIVER_DESC);
91 MODULE_LICENSE("GPL");
95 #define DBG(x...) printk(x)
97 #define DBG(x...) do {} while (0)
100 #define VSXXXAA_INTRO_MASK 0x80
101 #define VSXXXAA_INTRO_HEAD 0x80
102 #define IS_HDR_BYTE(x) \
103 (((x) & VSXXXAA_INTRO_MASK) == VSXXXAA_INTRO_HEAD)
105 #define VSXXXAA_PACKET_MASK 0xe0
106 #define VSXXXAA_PACKET_REL 0x80
107 #define VSXXXAA_PACKET_ABS 0xc0
108 #define VSXXXAA_PACKET_POR 0xa0
109 #define MATCH_PACKET_TYPE(data, type) \
110 (((data) & VSXXXAA_PACKET_MASK) == (type))
115 struct input_dev *dev;
117 #define BUFLEN 15 /* At least 5 is needed for a full tablet packet */
118 unsigned char buf[BUFLEN];
120 unsigned char version;
121 unsigned char country;
127 static void vsxxxaa_drop_bytes(struct vsxxxaa *mouse, int num)
129 if (num >= mouse->count) {
132 memmove(mouse->buf, mouse->buf + num - 1, BUFLEN - num);
137 static void vsxxxaa_queue_byte(struct vsxxxaa *mouse, unsigned char byte)
139 if (mouse->count == BUFLEN) {
140 printk(KERN_ERR "%s on %s: Dropping a byte of full buffer.\n",
141 mouse->name, mouse->phys);
142 vsxxxaa_drop_bytes(mouse, 1);
145 DBG(KERN_INFO "Queueing byte 0x%02x\n", byte);
147 mouse->buf[mouse->count++] = byte;
150 static void vsxxxaa_detection_done(struct vsxxxaa *mouse)
152 switch (mouse->type) {
154 strlcpy(mouse->name, "DEC VSXXX-AA/-GA mouse",
155 sizeof(mouse->name));
159 strlcpy(mouse->name, "DEC VSXXX-AB digitizer",
160 sizeof(mouse->name));
164 snprintf(mouse->name, sizeof(mouse->name),
165 "unknown DEC pointer device (type = 0x%02x)",
171 "Found %s version 0x%02x from country 0x%02x on port %s\n",
172 mouse->name, mouse->version, mouse->country, mouse->phys);
176 * Returns number of bytes to be dropped, 0 if packet is okay.
178 static int vsxxxaa_check_packet(struct vsxxxaa *mouse, int packet_len)
182 /* First byte must be a header byte */
183 if (!IS_HDR_BYTE(mouse->buf[0])) {
184 DBG("vsck: len=%d, 1st=0x%02x\n", packet_len, mouse->buf[0]);
188 /* Check all following bytes */
189 for (i = 1; i < packet_len; i++) {
190 if (IS_HDR_BYTE(mouse->buf[i])) {
192 "Need to drop %d bytes of a broken packet.\n",
194 DBG(KERN_INFO "check: len=%d, b[%d]=0x%02x\n",
195 packet_len, i, mouse->buf[i]);
203 static inline int vsxxxaa_smells_like_packet(struct vsxxxaa *mouse,
204 unsigned char type, size_t len)
206 return mouse->count >= len && MATCH_PACKET_TYPE(mouse->buf[0], type);
209 static void vsxxxaa_handle_REL_packet(struct vsxxxaa *mouse)
211 struct input_dev *dev = mouse->dev;
212 unsigned char *buf = mouse->buf;
213 int left, middle, right;
217 * Check for normal stream packets. This is three bytes,
218 * with the first byte's 3 MSB set to 100.
220 * [0]: 1 0 0 SignX SignY Left Middle Right
221 * [1]: 0 dx dx dx dx dx dx dx
222 * [2]: 0 dy dy dy dy dy dy dy
226 * Low 7 bit of byte 1 are abs(dx), bit 7 is
227 * 0, bit 4 of byte 0 is direction.
230 dx *= ((buf[0] >> 4) & 0x01) ? 1 : -1;
233 * Low 7 bit of byte 2 are abs(dy), bit 7 is
234 * 0, bit 3 of byte 0 is direction.
237 dy *= ((buf[0] >> 3) & 0x01) ? -1 : 1;
240 * Get button state. It's the low three bits
241 * (for three buttons) of byte 0.
243 left = buf[0] & 0x04;
244 middle = buf[0] & 0x02;
245 right = buf[0] & 0x01;
247 vsxxxaa_drop_bytes(mouse, 3);
249 DBG(KERN_INFO "%s on %s: dx=%d, dy=%d, buttons=%s%s%s\n",
250 mouse->name, mouse->phys, dx, dy,
251 left ? "L" : "l", middle ? "M" : "m", right ? "R" : "r");
254 * Report what we've found so far...
256 input_report_key(dev, BTN_LEFT, left);
257 input_report_key(dev, BTN_MIDDLE, middle);
258 input_report_key(dev, BTN_RIGHT, right);
259 input_report_key(dev, BTN_TOUCH, 0);
260 input_report_rel(dev, REL_X, dx);
261 input_report_rel(dev, REL_Y, dy);
265 static void vsxxxaa_handle_ABS_packet(struct vsxxxaa *mouse)
267 struct input_dev *dev = mouse->dev;
268 unsigned char *buf = mouse->buf;
269 int left, middle, right, touch;
273 * Tablet position / button packet
275 * [0]: 1 1 0 B4 B3 B2 B1 Pr
276 * [1]: 0 0 X5 X4 X3 X2 X1 X0
277 * [2]: 0 0 X11 X10 X9 X8 X7 X6
278 * [3]: 0 0 Y5 Y4 Y3 Y2 Y1 Y0
279 * [4]: 0 0 Y11 Y10 Y9 Y8 Y7 Y6
283 * Get X/Y position. Y axis needs to be inverted since VSXXX-AB
284 * counts down->top while monitor counts top->bottom.
286 x = ((buf[2] & 0x3f) << 6) | (buf[1] & 0x3f);
287 y = ((buf[4] & 0x3f) << 6) | (buf[3] & 0x3f);
291 * Get button state. It's bits <4..1> of byte 0.
293 left = buf[0] & 0x02;
294 middle = buf[0] & 0x04;
295 right = buf[0] & 0x08;
296 touch = buf[0] & 0x10;
298 vsxxxaa_drop_bytes(mouse, 5);
300 DBG(KERN_INFO "%s on %s: x=%d, y=%d, buttons=%s%s%s%s\n",
301 mouse->name, mouse->phys, x, y,
302 left ? "L" : "l", middle ? "M" : "m",
303 right ? "R" : "r", touch ? "T" : "t");
306 * Report what we've found so far...
308 input_report_key(dev, BTN_LEFT, left);
309 input_report_key(dev, BTN_MIDDLE, middle);
310 input_report_key(dev, BTN_RIGHT, right);
311 input_report_key(dev, BTN_TOUCH, touch);
312 input_report_abs(dev, ABS_X, x);
313 input_report_abs(dev, ABS_Y, y);
317 static void vsxxxaa_handle_POR_packet(struct vsxxxaa *mouse)
319 struct input_dev *dev = mouse->dev;
320 unsigned char *buf = mouse->buf;
321 int left, middle, right;
325 * Check for Power-On-Reset packets. These are sent out
326 * after plugging the mouse in, or when explicitly
327 * requested by sending 'T'.
329 * [0]: 1 0 1 0 R3 R2 R1 R0
330 * [1]: 0 M2 M1 M0 D3 D2 D1 D0
331 * [2]: 0 E6 E5 E4 E3 E2 E1 E0
332 * [3]: 0 0 0 0 0 Left Middle Right
334 * M: manufacturer location code
336 * E: Error code. If it's in the range of 0x00..0x1f, only some
337 * minor problem occurred. Errors >= 0x20 are considered bad
338 * and the device may not work properly...
339 * D: <0010> == mouse, <0100> == tablet
342 mouse->version = buf[0] & 0x0f;
343 mouse->country = (buf[1] >> 4) & 0x07;
344 mouse->type = buf[1] & 0x0f;
345 error = buf[2] & 0x7f;
348 * Get button state. It's the low three bits
349 * (for three buttons) of byte 0. Maybe even the bit <3>
350 * has some meaning if a tablet is attached.
352 left = buf[0] & 0x04;
353 middle = buf[0] & 0x02;
354 right = buf[0] & 0x01;
356 vsxxxaa_drop_bytes(mouse, 4);
357 vsxxxaa_detection_done(mouse);
360 /* No (serious) error. Report buttons */
361 input_report_key(dev, BTN_LEFT, left);
362 input_report_key(dev, BTN_MIDDLE, middle);
363 input_report_key(dev, BTN_RIGHT, right);
364 input_report_key(dev, BTN_TOUCH, 0);
368 printk(KERN_INFO "Your %s on %s reports error=0x%02x\n",
369 mouse->name, mouse->phys, error);
374 * If the mouse was hot-plugged, we need to force differential mode
375 * now... However, give it a second to recover from it's reset.
378 "%s on %s: Forcing standard packet format, "
379 "incremental streaming mode and 72 samples/sec\n",
380 mouse->name, mouse->phys);
381 serio_write(mouse->serio, 'S'); /* Standard format */
383 serio_write(mouse->serio, 'R'); /* Incremental */
385 serio_write(mouse->serio, 'L'); /* 72 samples/sec */
388 static void vsxxxaa_parse_buffer(struct vsxxxaa *mouse)
390 unsigned char *buf = mouse->buf;
394 * Parse buffer to death...
398 * Out of sync? Throw away what we don't understand. Each
399 * packet starts with a byte whose bit 7 is set. Unhandled
400 * packets (ie. which we don't know about or simply b0rk3d
401 * data...) will get shifted out of the buffer after some
402 * activity on the mouse.
404 while (mouse->count > 0 && !IS_HDR_BYTE(buf[0])) {
405 printk(KERN_ERR "%s on %s: Dropping a byte to regain "
406 "sync with mouse data stream...\n",
407 mouse->name, mouse->phys);
408 vsxxxaa_drop_bytes(mouse, 1);
412 * Check for packets we know about.
415 if (vsxxxaa_smells_like_packet(mouse, VSXXXAA_PACKET_REL, 3)) {
416 /* Check for broken packet */
417 stray_bytes = vsxxxaa_check_packet(mouse, 3);
419 vsxxxaa_handle_REL_packet(mouse);
421 } else if (vsxxxaa_smells_like_packet(mouse,
422 VSXXXAA_PACKET_ABS, 5)) {
423 /* Check for broken packet */
424 stray_bytes = vsxxxaa_check_packet(mouse, 5);
426 vsxxxaa_handle_ABS_packet(mouse);
428 } else if (vsxxxaa_smells_like_packet(mouse,
429 VSXXXAA_PACKET_POR, 4)) {
430 /* Check for broken packet */
431 stray_bytes = vsxxxaa_check_packet(mouse, 4);
433 vsxxxaa_handle_POR_packet(mouse);
436 break; /* No REL, ABS or POR packet found */
439 if (stray_bytes > 0) {
440 printk(KERN_ERR "Dropping %d bytes now...\n",
442 vsxxxaa_drop_bytes(mouse, stray_bytes);
448 static irqreturn_t vsxxxaa_interrupt(struct serio *serio,
449 unsigned char data, unsigned int flags)
451 struct vsxxxaa *mouse = serio_get_drvdata(serio);
453 vsxxxaa_queue_byte(mouse, data);
454 vsxxxaa_parse_buffer(mouse);
459 static void vsxxxaa_disconnect(struct serio *serio)
461 struct vsxxxaa *mouse = serio_get_drvdata(serio);
464 serio_set_drvdata(serio, NULL);
465 input_unregister_device(mouse->dev);
469 static int vsxxxaa_connect(struct serio *serio, struct serio_driver *drv)
471 struct vsxxxaa *mouse;
472 struct input_dev *input_dev;
475 mouse = kzalloc(sizeof(struct vsxxxaa), GFP_KERNEL);
476 input_dev = input_allocate_device();
477 if (!mouse || !input_dev)
480 mouse->dev = input_dev;
481 mouse->serio = serio;
482 strlcat(mouse->name, "DEC VSXXX-AA/-GA mouse or VSXXX-AB digitizer",
483 sizeof(mouse->name));
484 snprintf(mouse->phys, sizeof(mouse->phys), "%s/input0", serio->phys);
486 input_dev->name = mouse->name;
487 input_dev->phys = mouse->phys;
488 input_dev->id.bustype = BUS_RS232;
489 input_dev->dev.parent = &serio->dev;
491 __set_bit(EV_KEY, input_dev->evbit); /* We have buttons */
492 __set_bit(EV_REL, input_dev->evbit);
493 __set_bit(EV_ABS, input_dev->evbit);
494 __set_bit(BTN_LEFT, input_dev->keybit); /* We have 3 buttons */
495 __set_bit(BTN_MIDDLE, input_dev->keybit);
496 __set_bit(BTN_RIGHT, input_dev->keybit);
497 __set_bit(BTN_TOUCH, input_dev->keybit); /* ...and Tablet */
498 __set_bit(REL_X, input_dev->relbit);
499 __set_bit(REL_Y, input_dev->relbit);
500 input_set_abs_params(input_dev, ABS_X, 0, 1023, 0, 0);
501 input_set_abs_params(input_dev, ABS_Y, 0, 1023, 0, 0);
503 serio_set_drvdata(serio, mouse);
505 err = serio_open(serio, drv);
510 * Request selftest. Standard packet format and differential
511 * mode will be requested after the device ID'ed successfully.
513 serio_write(serio, 'T'); /* Test */
515 err = input_register_device(input_dev);
521 fail3: serio_close(serio);
522 fail2: serio_set_drvdata(serio, NULL);
523 fail1: input_free_device(input_dev);
528 static struct serio_device_id vsxxaa_serio_ids[] = {
531 .proto = SERIO_VSXXXAA,
538 MODULE_DEVICE_TABLE(serio, vsxxaa_serio_ids);
540 static struct serio_driver vsxxxaa_drv = {
544 .description = DRIVER_DESC,
545 .id_table = vsxxaa_serio_ids,
546 .connect = vsxxxaa_connect,
547 .interrupt = vsxxxaa_interrupt,
548 .disconnect = vsxxxaa_disconnect,
551 static int __init vsxxxaa_init(void)
553 return serio_register_driver(&vsxxxaa_drv);
556 static void __exit vsxxxaa_exit(void)
558 serio_unregister_driver(&vsxxxaa_drv);
561 module_init(vsxxxaa_init);
562 module_exit(vsxxxaa_exit);