1 // SPDX-License-Identifier: GPL-2.0
5  * Copyright (c) 2012-2013 David Herrmann <dh.herrmann@gmail.com>
17  *   1: Toggle left button (down, up, ...)
18  *   2: Toggle right button
19  *   3: Toggle middle button
22  *   w: Move mouse up
24  *   r: Move wheel up
27  * Additionally to 3 button mouse, 3 keyboard LEDs are also supported (LED_NUML,
35  *   gcc -o ./uhid_test -Wall -I./include ./samples/uhid/uhid-example.c
53  * We emulate a basic 3 button mouse with wheel and 3 keyboard LEDs. This is
54  * the report-descriptor as the kernel will parse it:
61  *       Button.0001
62  *       Button.0002
63  *       Button.0003
77  *     Logical Minimum(-128)
98  *   Button.0001 ---> Key.LeftBtn
99  *   Button.0002 ---> Key.RightBtn
100  *   Button.0003 ---> Key.MiddleBtn
101  *   GenericDesktop.X ---> Relative.X
102  *   GenericDesktop.Y ---> Relative.Y
103  *   GenericDesktop.Wheel ---> Relative.Wheel
104  *   LED.NumLock ---> LED.NumLock
105  *   LED.CapsLock ---> LED.CapsLock
106  *   LED.ScrollLock ---> LED.ScrollLock
119 	0x05, 0x09,			/* USAGE_PAGE (Button) */
120 	0x19, 0x01,			/* USAGE_MINIMUM (Button 1) */
121 	0x29, 0x03,			/* USAGE_MAXIMUM (Button 3) */
134 	0x15, 0x81,			/* LOGICAL_MINIMUM (-127) */
166 		return -errno;  in uhid_write()
170 		return -EFAULT;  in uhid_write()
182 	strcpy((char*)ev.u.create.name, "test-uhid-device");  in create()
211 	if (ev->u.output.rtype != UHID_OUTPUT_REPORT)  in handle_output()
214 	if (ev->u.output.size != 2)  in handle_output()
216 	/* first byte is report-id which is 0x02 for LEDs in our rdesc */  in handle_output()
217 	if (ev->u.output.data[0] != 0x2)  in handle_output()
222 		ev->u.output.data[1]);  in handle_output()
233 		fprintf(stderr, "Read HUP on uhid-cdev\n");  in event()
234 		return -EFAULT;  in event()
236 		fprintf(stderr, "Cannot read uhid-cdev: %m\n");  in event()
237 		return -errno;  in event()
239 		fprintf(stderr, "Invalid size read from uhid-dev: %zd != %zu\n",  in event()
241 		return -EFAULT;  in event()
246 		fprintf(stderr, "UHID_START from uhid-dev\n");  in event()
249 		fprintf(stderr, "UHID_STOP from uhid-dev\n");  in event()
252 		fprintf(stderr, "UHID_OPEN from uhid-dev\n");  in event()
255 		fprintf(stderr, "UHID_CLOSE from uhid-dev\n");  in event()
258 		fprintf(stderr, "UHID_OUTPUT from uhid-dev\n");  in event()
262 		fprintf(stderr, "UHID_OUTPUT_EV from uhid-dev\n");  in event()
265 		fprintf(stderr, "Invalid event from uhid-dev: %u\n", ev.type);  in event()
309 		return -EFAULT;  in keyboard()
312 		return -errno;  in keyboard()
336 			abs_hor = -20;  in keyboard()
350 			abs_ver = -20;  in keyboard()
371 			wheel = -1;  in keyboard()
378 			return -ECANCELED;  in keyboard()
407 		if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help")) {  in main()
415 	fprintf(stderr, "Open uhid-cdev %s\n", path);  in main()
418 		fprintf(stderr, "Cannot open uhid-cdev %s: %m\n", path);  in main()
436 		ret = poll(pfds, 2, -1);  in main()
446 			fprintf(stderr, "Received HUP on uhid-cdev\n");  in main()