1 // SPDX-License-Identifier: GPL-2.0-only
3  * SPI testing utility (using spidev driver)
8  * Cross-compile with cross-gcc -I/path/to/cross-kernel/include
23 #include <linux/spi/spidev.h>
66 	while (length-- > 0) {  in hex_dump()
86  *  Unescape - process hexadecimal escape character
87  *      converts shell input "\x23" -> 0x23
143 		pabort("can't send spi message");  in transfer()
166 	printf("Usage: %s [-DsbdlHOLC3vpNR24SI]\n", prog);  in print_usage()
167 	puts("  -D --device   device to use (default /dev/spidev1.1)\n"  in print_usage()
168 	     "  -s --speed    max speed (Hz)\n"  in print_usage()
169 	     "  -d --delay    delay (usec)\n"  in print_usage()
170 	     "  -b --bpw      bits per word\n"  in print_usage()
171 	     "  -i --input    input data from a file (e.g. \"test.bin\")\n"  in print_usage()
172 	     "  -o --output   output data to a file (e.g. \"results.bin\")\n"  in print_usage()
173 	     "  -l --loop     loopback\n"  in print_usage()
174 	     "  -H --cpha     clock phase\n"  in print_usage()
175 	     "  -O --cpol     clock polarity\n"  in print_usage()
176 	     "  -L --lsb      least significant bit first\n"  in print_usage()
177 	     "  -C --cs-high  chip select active high\n"  in print_usage()
178 	     "  -3 --3wire    SI/SO signals shared\n"  in print_usage()
179 	     "  -v --verbose  Verbose (show tx buffer)\n"  in print_usage()
180 	     "  -p            Send data (e.g. \"1234\\xde\\xad\")\n"  in print_usage()
181 	     "  -N --no-cs    no chip select\n"  in print_usage()
182 	     "  -R --ready    slave pulls low to pause\n"  in print_usage()
183 	     "  -2 --dual     dual transfer\n"  in print_usage()
184 	     "  -4 --quad     quad transfer\n"  in print_usage()
185 	     "  -S --size     transfer size\n"  in print_usage()
186 	     "  -I --iter     iterations\n");  in print_usage()
204 			{ "cs-high", 0, 0, 'C' },  in parse_opts()
205 			{ "3wire",   0, 0, '3' },  in parse_opts()
206 			{ "no-cs",   0, 0, 'N' },  in parse_opts()
220 		if (c == -1)  in parse_opts()
257 		case '3':  in parse_opts()
325 	if (stat(filename, &sb) == -1)  in transfer_file()
358 	rx_rate = ((_read_count - prev_read_count) * 8) / (interval*1000.0);  in show_transfer_rate()
359 	tx_rate = ((_write_count - prev_write_count) * 8) / (interval*1000.0);  in show_transfer_rate()
413 	 * spi mode  in main()
416 	if (ret == -1)  in main()
417 		pabort("can't set spi mode");  in main()
420 	if (ret == -1)  in main()
421 		pabort("can't get spi mode");  in main()
427 	if (ret == -1)  in main()
431 	if (ret == -1)  in main()
438 	if (ret == -1)  in main()
442 	if (ret == -1)  in main()
445 	printf("spi mode: 0x%x\n", mode);  in main()
450 		pabort("only one of -p and --input may be selected");  in main()
461 		while (iterations-- > 0) {  in main()
467 			if (current.tv_sec - last_stat.tv_sec > interval) {  in main()