1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Driver for	DEC VSXXX-AA mouse (hockey-puck mouse, ball or two rollers)
4  *		DEC VSXXX-GA mouse (rectangular mouse, with ball)
5  *		DEC VSXXX-AB tablet (digitizer with hair cross or stylus)
7  * Copyright (C) 2003-2004 by Jan-Benedict Glaw <jbglaw@lug-owl.de>
24  * supply at +5V and -12V.
30  *  | 4 --- 3 |
32  *    -------
35  *	1 (GND)		5	7	-
36  *	2 (RxD)		2	3	-
37  *	3 (TxD)		3	2	-
38  *	4 (-12V)	-	-	Somewhere from the PSU. At ATX, it's
39  *					the thin blue wire at pin 12 of the
41  *					VSXXX-AA/-GA mice.
42  *	5 (+5V)		-	-	PSU (red wires of ATX power connector
45  *	6 (+12V)	-	-	HDD power connector, yellow wire. Only
46  *					required for VSXXX-AB digitizer.
47  *	7 (dev. avail.)	-	-	The mouse shorts this one to pin 1.
53  * wires to a RS232 port and two or three additional wires for +5V, +12V and
54  * -12V to the PSU.
58  * The mice and tablet are described in "VCB02 Video Subsystem - Technical
59  * Manual", DEC EK-104AA-TM-001. You'll find it at MANX, a search engine
61  * http://www.vt100.net/manx/details?pn=EK-104AA-TM-001;id=21;cp=1
71 #define DRIVER_DESC "Driver for DEC VSXXX-AA and -GA mice and VSXXX-AB tablet"
73 MODULE_AUTHOR("Jan-Benedict Glaw <jbglaw@lug-owl.de>");
113 	if (num >= mouse->count) {  in vsxxxaa_drop_bytes()
114 		mouse->count = 0;  in vsxxxaa_drop_bytes()
116 		memmove(mouse->buf, mouse->buf + num, BUFLEN - num);  in vsxxxaa_drop_bytes()
117 		mouse->count -= num;  in vsxxxaa_drop_bytes()
123 	if (mouse->count == BUFLEN) {  in vsxxxaa_queue_byte()
124 		printk(KERN_ERR "%s on %s: Dropping a byte of full buffer.\n",  in vsxxxaa_queue_byte()
125 			mouse->name, mouse->phys);  in vsxxxaa_queue_byte()
131 	mouse->buf[mouse->count++] = byte;  in vsxxxaa_queue_byte()
136 	switch (mouse->type) {  in vsxxxaa_detection_done()
138 		strscpy(mouse->name, "DEC VSXXX-AA/-GA mouse",  in vsxxxaa_detection_done()
139 			sizeof(mouse->name));  in vsxxxaa_detection_done()
143 		strscpy(mouse->name, "DEC VSXXX-AB digitizer",  in vsxxxaa_detection_done()
144 			sizeof(mouse->name));  in vsxxxaa_detection_done()
148 		snprintf(mouse->name, sizeof(mouse->name),  in vsxxxaa_detection_done()
150 			 mouse->type);  in vsxxxaa_detection_done()
156 		mouse->name, mouse->version, mouse->country, mouse->phys);  in vsxxxaa_detection_done()
160  * Returns number of bytes to be dropped, 0 if packet is okay.
167 	if (!IS_HDR_BYTE(mouse->buf[0])) {  in vsxxxaa_check_packet()
168 		DBG("vsck: len=%d, 1st=0x%02x\n", packet_len, mouse->buf[0]);  in vsxxxaa_check_packet()
174 		if (IS_HDR_BYTE(mouse->buf[i])) {  in vsxxxaa_check_packet()
176 				"Need to drop %d bytes of a broken packet.\n",  in vsxxxaa_check_packet()
177 				i - 1);  in vsxxxaa_check_packet()
179 			    packet_len, i, mouse->buf[i]);  in vsxxxaa_check_packet()
180 			return i - 1;  in vsxxxaa_check_packet()
190 	return mouse->count >= len && MATCH_PACKET_TYPE(mouse->buf[0], type);  in vsxxxaa_smells_like_packet()
195 	struct input_dev *dev = mouse->dev;  in vsxxxaa_handle_REL_packet()
196 	unsigned char *buf = mouse->buf;  in vsxxxaa_handle_REL_packet()
210 	 * Low 7 bit of byte 1 are abs(dx), bit 7 is  in vsxxxaa_handle_REL_packet()
211 	 * 0, bit 4 of byte 0 is direction.  in vsxxxaa_handle_REL_packet()
214 	dx *= ((buf[0] >> 4) & 0x01) ? 1 : -1;  in vsxxxaa_handle_REL_packet()
217 	 * Low 7 bit of byte 2 are abs(dy), bit 7 is  in vsxxxaa_handle_REL_packet()
218 	 * 0, bit 3 of byte 0 is direction.  in vsxxxaa_handle_REL_packet()
221 	dy *= ((buf[0] >> 3) & 0x01) ? -1 : 1;  in vsxxxaa_handle_REL_packet()
225 	 * (for three buttons) of byte 0.  in vsxxxaa_handle_REL_packet()
234 	    mouse->name, mouse->phys, dx, dy,  in vsxxxaa_handle_REL_packet()
251 	struct input_dev *dev = mouse->dev;  in vsxxxaa_handle_ABS_packet()
252 	unsigned char *buf = mouse->buf;  in vsxxxaa_handle_ABS_packet()
267 	 * Get X/Y position. Y axis needs to be inverted since VSXXX-AB  in vsxxxaa_handle_ABS_packet()
268 	 * counts down->top while monitor counts top->bottom.  in vsxxxaa_handle_ABS_packet()
272 	y = 1023 - y;  in vsxxxaa_handle_ABS_packet()
275 	 * Get button state. It's bits <4..1> of byte 0.  in vsxxxaa_handle_ABS_packet()
285 	    mouse->name, mouse->phys, x, y,  in vsxxxaa_handle_ABS_packet()
303 	struct input_dev *dev = mouse->dev;  in vsxxxaa_handle_POR_packet()
304 	unsigned char *buf = mouse->buf;  in vsxxxaa_handle_POR_packet()
309 	 * Check for Power-On-Reset packets. These are sent out  in vsxxxaa_handle_POR_packet()
320 	 * E: Error code. If it's in the range of 0x00..0x1f, only some  in vsxxxaa_handle_POR_packet()
326 	mouse->version = buf[0] & 0x0f;  in vsxxxaa_handle_POR_packet()
327 	mouse->country = (buf[1] >> 4) & 0x07;  in vsxxxaa_handle_POR_packet()
328 	mouse->type = buf[1] & 0x0f;  in vsxxxaa_handle_POR_packet()
333 	 * (for three buttons) of byte 0. Maybe even the bit <3>  in vsxxxaa_handle_POR_packet()
353 				mouse->name, mouse->phys, error);  in vsxxxaa_handle_POR_packet()
358 	 * If the mouse was hot-plugged, we need to force differential mode  in vsxxxaa_handle_POR_packet()
364 		mouse->name, mouse->phys);  in vsxxxaa_handle_POR_packet()
365 	serio_write(mouse->serio, 'S');	/* Standard format */  in vsxxxaa_handle_POR_packet()
367 	serio_write(mouse->serio, 'R');	/* Incremental */  in vsxxxaa_handle_POR_packet()
369 	serio_write(mouse->serio, 'L');	/* 72 samples/sec */  in vsxxxaa_handle_POR_packet()
374 	unsigned char *buf = mouse->buf;  in vsxxxaa_parse_buffer()
382 		 * Out of sync? Throw away what we don't understand. Each  in vsxxxaa_parse_buffer()
385 		 * data...) will get shifted out of the buffer after some  in vsxxxaa_parse_buffer()
388 		while (mouse->count > 0 && !IS_HDR_BYTE(buf[0])) {  in vsxxxaa_parse_buffer()
391 				mouse->name, mouse->phys);  in vsxxxaa_parse_buffer()
449 	input_unregister_device(mouse->dev);  in vsxxxaa_disconnect()
457 	int err = -ENOMEM;  in vsxxxaa_connect()
464 	mouse->dev = input_dev;  in vsxxxaa_connect()
465 	mouse->serio = serio;  in vsxxxaa_connect()
466 	strlcat(mouse->name, "DEC VSXXX-AA/-GA mouse or VSXXX-AB digitizer",  in vsxxxaa_connect()
467 		 sizeof(mouse->name));  in vsxxxaa_connect()
468 	snprintf(mouse->phys, sizeof(mouse->phys), "%s/input0", serio->phys);  in vsxxxaa_connect()
470 	input_dev->name = mouse->name;  in vsxxxaa_connect()
471 	input_dev->phys = mouse->phys;  in vsxxxaa_connect()
472 	input_dev->id.bustype = BUS_RS232;  in vsxxxaa_connect()
473 	input_dev->dev.parent = &serio->dev;  in vsxxxaa_connect()
475 	__set_bit(EV_KEY, input_dev->evbit);		/* We have buttons */  in vsxxxaa_connect()
476 	__set_bit(EV_REL, input_dev->evbit);  in vsxxxaa_connect()
477 	__set_bit(EV_ABS, input_dev->evbit);  in vsxxxaa_connect()
478 	__set_bit(BTN_LEFT, input_dev->keybit);		/* We have 3 buttons */  in vsxxxaa_connect()
479 	__set_bit(BTN_MIDDLE, input_dev->keybit);  in vsxxxaa_connect()
480 	__set_bit(BTN_RIGHT, input_dev->keybit);  in vsxxxaa_connect()
481 	__set_bit(BTN_TOUCH, input_dev->keybit);	/* ...and Tablet */  in vsxxxaa_connect()
482 	__set_bit(REL_X, input_dev->relbit);  in vsxxxaa_connect()
483 	__set_bit(REL_Y, input_dev->relbit);  in vsxxxaa_connect()