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/config.h>
85 #include <linux/serio.h>
86 #include <linux/init.h>
88 #define DRIVER_DESC "Driver for DEC VSXXX-AA and -GA mice and VSXXX-AB tablet"
90 MODULE_AUTHOR ("Jan-Benedict Glaw <jbglaw@lug-owl.de>");
91 MODULE_DESCRIPTION (DRIVER_DESC);
92 MODULE_LICENSE ("GPL");
96 #define DBG(x...) printk (x)
98 #define DBG(x...) do {} while (0)
101 #define VSXXXAA_INTRO_MASK 0x80
102 #define VSXXXAA_INTRO_HEAD 0x80
103 #define IS_HDR_BYTE(x) (((x) & VSXXXAA_INTRO_MASK) \
104 == VSXXXAA_INTRO_HEAD)
106 #define VSXXXAA_PACKET_MASK 0xe0
107 #define VSXXXAA_PACKET_REL 0x80
108 #define VSXXXAA_PACKET_ABS 0xc0
109 #define VSXXXAA_PACKET_POR 0xa0
110 #define MATCH_PACKET_TYPE(data, type) (((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;
128 vsxxxaa_drop_bytes (struct vsxxxaa *mouse, int num)
130 if (num >= mouse->count)
133 memmove (mouse->buf, mouse->buf + num - 1, BUFLEN - num);
139 vsxxxaa_queue_byte (struct vsxxxaa *mouse, unsigned char byte)
141 if (mouse->count == BUFLEN) {
142 printk (KERN_ERR "%s on %s: Dropping a byte of full buffer.\n",
143 mouse->name, mouse->phys);
144 vsxxxaa_drop_bytes (mouse, 1);
146 DBG (KERN_INFO "Queueing byte 0x%02x\n", byte);
148 mouse->buf[mouse->count++] = byte;
152 vsxxxaa_detection_done (struct vsxxxaa *mouse)
154 switch (mouse->type) {
156 sprintf (mouse->name, "DEC VSXXX-AA/-GA mouse");
160 sprintf (mouse->name, "DEC VSXXX-AB digitizer");
164 sprintf (mouse->name, "unknown DEC pointer device "
165 "(type = 0x%02x)", mouse->type);
169 printk (KERN_INFO "Found %s version 0x%02x from country 0x%02x "
170 "on port %s\n", mouse->name, mouse->version,
171 mouse->country, mouse->phys);
175 * Returns number of bytes to be dropped, 0 if packet is okay.
178 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 if (packet_len > 1) {
190 for (i = 1; i < packet_len; i++) {
191 if (IS_HDR_BYTE (mouse->buf[i])) {
192 printk (KERN_ERR "Need to drop %d bytes "
193 "of a broken packet.\n",
195 DBG (KERN_INFO "check: len=%d, b[%d]=0x%02x\n",
196 packet_len, i, mouse->buf[i]);
205 static __inline__ int
206 vsxxxaa_smells_like_packet (struct vsxxxaa *mouse, unsigned char type, size_t len)
208 return (mouse->count >= len) && MATCH_PACKET_TYPE (mouse->buf[0], type);
212 vsxxxaa_handle_REL_packet (struct vsxxxaa *mouse, struct pt_regs *regs)
214 struct input_dev *dev = &mouse->dev;
215 unsigned char *buf = mouse->buf;
216 int left, middle, right;
220 * Check for normal stream packets. This is three bytes,
221 * with the first byte's 3 MSB set to 100.
223 * [0]: 1 0 0 SignX SignY Left Middle Right
224 * [1]: 0 dx dx dx dx dx dx dx
225 * [2]: 0 dy dy dy dy dy dy dy
229 * Low 7 bit of byte 1 are abs(dx), bit 7 is
230 * 0, bit 4 of byte 0 is direction.
233 dx *= ((buf[0] >> 4) & 0x01)? 1: -1;
236 * Low 7 bit of byte 2 are abs(dy), bit 7 is
237 * 0, bit 3 of byte 0 is direction.
240 dy *= ((buf[0] >> 3) & 0x01)? -1: 1;
243 * Get button state. It's the low three bits
244 * (for three buttons) of byte 0.
246 left = (buf[0] & 0x04)? 1: 0;
247 middle = (buf[0] & 0x02)? 1: 0;
248 right = (buf[0] & 0x01)? 1: 0;
250 vsxxxaa_drop_bytes (mouse, 3);
252 DBG (KERN_INFO "%s on %s: dx=%d, dy=%d, buttons=%s%s%s\n",
253 mouse->name, mouse->phys, dx, dy,
254 left? "L": "l", middle? "M": "m", right? "R": "r");
257 * Report what we've found so far...
259 input_regs (dev, regs);
260 input_report_key (dev, BTN_LEFT, left);
261 input_report_key (dev, BTN_MIDDLE, middle);
262 input_report_key (dev, BTN_RIGHT, right);
263 input_report_key (dev, BTN_TOUCH, 0);
264 input_report_rel (dev, REL_X, dx);
265 input_report_rel (dev, REL_Y, dy);
270 vsxxxaa_handle_ABS_packet (struct vsxxxaa *mouse, struct pt_regs *regs)
272 struct input_dev *dev = &mouse->dev;
273 unsigned char *buf = mouse->buf;
274 int left, middle, right, touch;
278 * Tablet position / button packet
280 * [0]: 1 1 0 B4 B3 B2 B1 Pr
281 * [1]: 0 0 X5 X4 X3 X2 X1 X0
282 * [2]: 0 0 X11 X10 X9 X8 X7 X6
283 * [3]: 0 0 Y5 Y4 Y3 Y2 Y1 Y0
284 * [4]: 0 0 Y11 Y10 Y9 Y8 Y7 Y6
288 * Get X/Y position. Y axis needs to be inverted since VSXXX-AB
289 * counts down->top while monitor counts top->bottom.
291 x = ((buf[2] & 0x3f) << 6) | (buf[1] & 0x3f);
292 y = ((buf[4] & 0x3f) << 6) | (buf[3] & 0x3f);
296 * Get button state. It's bits <4..1> of byte 0.
298 left = (buf[0] & 0x02)? 1: 0;
299 middle = (buf[0] & 0x04)? 1: 0;
300 right = (buf[0] & 0x08)? 1: 0;
301 touch = (buf[0] & 0x10)? 1: 0;
303 vsxxxaa_drop_bytes (mouse, 5);
305 DBG (KERN_INFO "%s on %s: x=%d, y=%d, buttons=%s%s%s%s\n",
306 mouse->name, mouse->phys, x, y,
307 left? "L": "l", middle? "M": "m",
308 right? "R": "r", touch? "T": "t");
311 * Report what we've found so far...
313 input_regs (dev, regs);
314 input_report_key (dev, BTN_LEFT, left);
315 input_report_key (dev, BTN_MIDDLE, middle);
316 input_report_key (dev, BTN_RIGHT, right);
317 input_report_key (dev, BTN_TOUCH, touch);
318 input_report_abs (dev, ABS_X, x);
319 input_report_abs (dev, ABS_Y, y);
324 vsxxxaa_handle_POR_packet (struct vsxxxaa *mouse, struct pt_regs *regs)
326 struct input_dev *dev = &mouse->dev;
327 unsigned char *buf = mouse->buf;
328 int left, middle, right;
332 * Check for Power-On-Reset packets. These are sent out
333 * after plugging the mouse in, or when explicitely
334 * requested by sending 'T'.
336 * [0]: 1 0 1 0 R3 R2 R1 R0
337 * [1]: 0 M2 M1 M0 D3 D2 D1 D0
338 * [2]: 0 E6 E5 E4 E3 E2 E1 E0
339 * [3]: 0 0 0 0 0 Left Middle Right
341 * M: manufacturer location code
343 * E: Error code. If it's in the range of 0x00..0x1f, only some
344 * minor problem occured. Errors >= 0x20 are considered bad
345 * and the device may not work properly...
346 * D: <0010> == mouse, <0100> == tablet
349 mouse->version = buf[0] & 0x0f;
350 mouse->country = (buf[1] >> 4) & 0x07;
351 mouse->type = buf[1] & 0x0f;
352 error = buf[2] & 0x7f;
355 * Get button state. It's the low three bits
356 * (for three buttons) of byte 0. Maybe even the bit <3>
357 * has some meaning if a tablet is attached.
359 left = (buf[0] & 0x04)? 1: 0;
360 middle = (buf[0] & 0x02)? 1: 0;
361 right = (buf[0] & 0x01)? 1: 0;
363 vsxxxaa_drop_bytes (mouse, 4);
364 vsxxxaa_detection_done (mouse);
367 /* No (serious) error. Report buttons */
368 input_regs (dev, regs);
369 input_report_key (dev, BTN_LEFT, left);
370 input_report_key (dev, BTN_MIDDLE, middle);
371 input_report_key (dev, BTN_RIGHT, right);
372 input_report_key (dev, BTN_TOUCH, 0);
376 printk (KERN_INFO "Your %s on %s reports error=0x%02x\n",
377 mouse->name, mouse->phys, error);
382 * If the mouse was hot-plugged, we need to force differential mode
383 * now... However, give it a second to recover from it's reset.
385 printk (KERN_NOTICE "%s on %s: Forceing standard packet format, "
386 "incremental streaming mode and 72 samples/sec\n",
387 mouse->name, mouse->phys);
388 mouse->serio->write (mouse->serio, 'S'); /* Standard format */
390 mouse->serio->write (mouse->serio, 'R'); /* Incremental */
392 mouse->serio->write (mouse->serio, 'L'); /* 72 samples/sec */
396 vsxxxaa_parse_buffer (struct vsxxxaa *mouse, struct pt_regs *regs)
398 unsigned char *buf = mouse->buf;
402 * Parse buffer to death...
406 * Out of sync? Throw away what we don't understand. Each
407 * packet starts with a byte whose bit 7 is set. Unhandled
408 * packets (ie. which we don't know about or simply b0rk3d
409 * data...) will get shifted out of the buffer after some
410 * activity on the mouse.
412 while (mouse->count > 0 && !IS_HDR_BYTE(buf[0])) {
413 printk (KERN_ERR "%s on %s: Dropping a byte to regain "
414 "sync with mouse data stream...\n",
415 mouse->name, mouse->phys);
416 vsxxxaa_drop_bytes (mouse, 1);
420 * Check for packets we know about.
423 if (vsxxxaa_smells_like_packet (mouse, VSXXXAA_PACKET_REL, 3)) {
424 /* Check for broken packet */
425 stray_bytes = vsxxxaa_check_packet (mouse, 3);
426 if (stray_bytes > 0) {
427 printk (KERN_ERR "Dropping %d bytes now...\n",
429 vsxxxaa_drop_bytes (mouse, stray_bytes);
433 vsxxxaa_handle_REL_packet (mouse, regs);
434 continue; /* More to parse? */
437 if (vsxxxaa_smells_like_packet (mouse, VSXXXAA_PACKET_ABS, 5)) {
438 /* Check for broken packet */
439 stray_bytes = vsxxxaa_check_packet (mouse, 5);
440 if (stray_bytes > 0) {
441 printk (KERN_ERR "Dropping %d bytes now...\n",
443 vsxxxaa_drop_bytes (mouse, stray_bytes);
447 vsxxxaa_handle_ABS_packet (mouse, regs);
448 continue; /* More to parse? */
451 if (vsxxxaa_smells_like_packet (mouse, VSXXXAA_PACKET_POR, 4)) {
452 /* Check for broken packet */
453 stray_bytes = vsxxxaa_check_packet (mouse, 4);
454 if (stray_bytes > 0) {
455 printk (KERN_ERR "Dropping %d bytes now...\n",
457 vsxxxaa_drop_bytes (mouse, stray_bytes);
461 vsxxxaa_handle_POR_packet (mouse, regs);
462 continue; /* More to parse? */
465 break; /* No REL, ABS or POR packet found */
470 vsxxxaa_interrupt (struct serio *serio, unsigned char data, unsigned int flags,
471 struct pt_regs *regs)
473 struct vsxxxaa *mouse = serio_get_drvdata (serio);
475 vsxxxaa_queue_byte (mouse, data);
476 vsxxxaa_parse_buffer (mouse, regs);
482 vsxxxaa_disconnect (struct serio *serio)
484 struct vsxxxaa *mouse = serio_get_drvdata (serio);
486 input_unregister_device (&mouse->dev);
488 serio_set_drvdata (serio, NULL);
493 vsxxxaa_connect (struct serio *serio, struct serio_driver *drv)
495 struct vsxxxaa *mouse;
498 if (!(mouse = kmalloc (sizeof (struct vsxxxaa), GFP_KERNEL)))
501 memset (mouse, 0, sizeof (struct vsxxxaa));
503 init_input_dev (&mouse->dev);
504 set_bit (EV_KEY, mouse->dev.evbit); /* We have buttons */
505 set_bit (EV_REL, mouse->dev.evbit);
506 set_bit (EV_ABS, mouse->dev.evbit);
507 set_bit (BTN_LEFT, mouse->dev.keybit); /* We have 3 buttons */
508 set_bit (BTN_MIDDLE, mouse->dev.keybit);
509 set_bit (BTN_RIGHT, mouse->dev.keybit);
510 set_bit (BTN_TOUCH, mouse->dev.keybit); /* ...and Tablet */
511 set_bit (REL_X, mouse->dev.relbit);
512 set_bit (REL_Y, mouse->dev.relbit);
513 set_bit (ABS_X, mouse->dev.absbit);
514 set_bit (ABS_Y, mouse->dev.absbit);
516 mouse->dev.absmin[ABS_X] = 0;
517 mouse->dev.absmax[ABS_X] = 1023;
518 mouse->dev.absmin[ABS_Y] = 0;
519 mouse->dev.absmax[ABS_Y] = 1023;
521 mouse->dev.private = mouse;
523 sprintf (mouse->name, "DEC VSXXX-AA/-GA mouse or VSXXX-AB digitizer");
524 sprintf (mouse->phys, "%s/input0", serio->phys);
525 mouse->dev.name = mouse->name;
526 mouse->dev.phys = mouse->phys;
527 mouse->dev.id.bustype = BUS_RS232;
528 mouse->dev.dev = &serio->dev;
529 mouse->serio = serio;
531 serio_set_drvdata (serio, mouse);
533 err = serio_open (serio, drv);
535 serio_set_drvdata (serio, NULL);
541 * Request selftest. Standard packet format and differential
542 * mode will be requested after the device ID'ed successfully.
544 mouse->serio->write (mouse->serio, 'T'); /* Test */
546 input_register_device (&mouse->dev);
548 printk (KERN_INFO "input: %s on %s\n", mouse->name, mouse->phys);
553 static struct serio_device_id vsxxaa_serio_ids[] = {
556 .proto = SERIO_VSXXXAA,
563 MODULE_DEVICE_TABLE(serio, vsxxaa_serio_ids);
565 static struct serio_driver vsxxxaa_drv = {
569 .description = DRIVER_DESC,
570 .id_table = vsxxaa_serio_ids,
571 .connect = vsxxxaa_connect,
572 .interrupt = vsxxxaa_interrupt,
573 .disconnect = vsxxxaa_disconnect,
579 serio_register_driver(&vsxxxaa_drv);
586 serio_unregister_driver(&vsxxxaa_drv);
589 module_init (vsxxxaa_init);
590 module_exit (vsxxxaa_exit);