1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
51 #define	DIR_NONE		-1
54 	int	mode;		/* mode (0,1,2,3, -1 == use default) */
55 	int	speed;		/* speed (in Hz, -1 == use default) */
58 	int	binary;		/* non-zero for binary output or zero for
61 				 * non-zero for ASCII input, 'binary'
63 	int	lsb;		/* non-zero for LSB order (default order is
65 	int	verbose;	/* non-zero for verbosity */
85  * LSB array - reversebits[n] is the LSB value of n as an MSB.  Use this array
86  * to obtain a reversed bit pattern of the index value when bits must
129 	fputs(" - communicate on SPI bus with slave devices\n"  in usage()
131 	      "        spi [-f device] [-d r|w|rw] [-m mode] [-s max-speed] [-c count]\n"  in usage()
132 	      "            [-C \"command bytes\"] [-A] [-b] [-L] [-v]\n"  in usage()
133 	      "        spi -i [-f device] [-v]\n"  in usage()
134 	      "        spi -h\n"  in usage()
136 	      "        -f specifies the device (default is spigen0.0)\n"  in usage()
137 	      "        -d specifies the operation (r, w, or rw; default is rw)\n"  in usage()
138 	      "        -m specifies the mode (0, 1, 2, or 3)\n"  in usage()
139 	      "        -s specifies the maximum speed (default is 0, device default)\n"  in usage()
140 	      "        -c specifies the number of data bytes to transfer (default 0, i.e. none)\n"  in usage()
142 	      "        -C specifies 'command bytes' to be sent, as 2 byte hexadecimal values\n"  in usage()
144 	      "        -L specifies 'LSB' order on the SPI bus (default is MSB)\n"  in usage()
145 	      "        -i query information about the device\n"  in usage()
146 	      "        -A uses ASCII for input/output as 2-digit hex values\n"  in usage()
147 	      "        -b Override output format as binary (only valid with '-A')\n"  in usage()
148 	      "        -v verbose output\n"  in usage()
149 	      "        -h prints this message\n"  in usage()
168 	hdev = -1;  in main()
173 	opt.mode = -1;  in main()
174 	opt.speed = -1;  in main()
183 	while (!err && (ch = getopt(argc, argv, "f:d:m:s:c:C:AbLvih")) != -1) {  in main()
204 				fputs("error - missing device name\n", stderr);  in main()
287 	argc -= optind;  in main()
291 	    (fdir == DIR_NONE && !finfo && opt.mode == -1 && opt.speed == -1 && opt.count == 0)) {  in main()
331 	if (hdev == -1) {  in main()
332 		fprintf(stderr, "Error - unable to open '%s', errno=%d\n",  in main()
345 	if (opt.mode != -1) {  in main()
352 	if (opt.speed != -1) {  in main()
359 	/* do data transfer */  in main()
373 	if (hdev != -1)  in main()
391 	popt->pcmd = (uint8_t *)malloc(cbcmd);  in interpret_command_bytes()
393 	if (!popt->pcmd)  in interpret_command_bytes()
396 	pcur = popt->pcmd;  in interpret_command_bytes()
423 		if (ctr >= cbcmd) { /* need re-alloc buffer? (unlikely) */  in interpret_command_bytes()
425 			ptemp = realloc(popt->pcmd, cbcmd);  in interpret_command_bytes()
435 			popt->pcmd = (uint8_t *)ptemp;  in interpret_command_bytes()
436 			pcur = popt->pcmd + ctr;  in interpret_command_bytes()
439 		if (popt->lsb)  in interpret_command_bytes()
448 	popt->ncmd = ctr; /* record num bytes in '-C' argument */  in interpret_command_bytes()
452 	/* at this point popt->pcmd is NULL or a valid pointer */  in interpret_command_bytes()
489 	uint32_t fmode = popt->mode;  in set_mode()
491 	if (popt->mode < 0)	/* use default? */  in set_mode()
500 	uint32_t clock_speed = popt->speed;  in set_speed()
502 	if (popt->speed < 0)  in set_speed()
512 		return c - '0';  in hexval()
514 		return c - 'A' + 10;  in hexval()
516 		return c - 'a' + 10;  in hexval()
518 	return -1;  in hexval()
529 	ncmd = popt->ncmd; /* num command bytes (can be zero) */  in prep_write_buffer()
531 	if (ncmd == 0 && popt->count == 0)  in prep_write_buffer()
535 	if (popt->count < 0) {  in prep_write_buffer()
539 		cbdata = popt->count;  in prep_write_buffer()
542 	lsb = popt->lsb; /* non-zero if LSB order; else MSB */  in prep_write_buffer()
552 	if (popt->pcmd && ncmd > 0) {  in prep_write_buffer()
553 		memcpy(pdata, popt->pcmd, ncmd); /* copy command bytes */  in prep_write_buffer()
568 		if (popt->ASCII) {  in prep_write_buffer()
603 		/* for LSB, flip the bits - otherwise, just copy the value */  in prep_write_buffer()
609 		cbread++; /* increment num bytes read so far */  in prep_write_buffer()
619 	if (popt->verbose > 0) {  in prep_write_buffer()
627 		if (popt->ASCII)  in prep_write_buffer()
639 	if (popt->count < 0) {  in prep_write_buffer()
640 		popt->count = cbread;  in prep_write_buffer()
652 	 * popt->count bytes will be sent and read from the SPI, preceded by the  in prep_write_buffer()
653 	 * 'popt->ncmd' command bytes (if any).  in prep_write_buffer()
654 	 * So we must use 'popt->count' and 'popt->ncmd' from this point on in  in prep_write_buffer()
658 	if (popt->verbose > 0 && popt->count + popt->ncmd) {  in prep_write_buffer()
659 		if ((popt->count + popt->ncmd) == 1)  in prep_write_buffer()
665 		        popt->count + popt->ncmd, szbytes);  in prep_write_buffer()
667 		verbose_dump_buffer(pdata, popt->count + popt->ncmd, lsb);  in prep_write_buffer()
696 	 * The remaining members for spi.st_data are zero - all bytes are  in _read_write()
702 	err = ioctl(hdev, SPIGENIOC_TRANSFER, &spi) < 0 ? -1 : 0;  in _read_write()
705 		/* flip the bits for 'lsb' mode */  in _read_write()
726 	pbuf = (uint8_t *)pr + popt->ncmd; /* only the data we want */  in _do_data_output()
727 	icount = popt->count;  in _do_data_output()
731 		return -1; /* should not but could happen */  in _do_data_output()
739 	if (popt->ncmd != 1)  in _do_data_output()
745 	if (popt->binary || !popt->ASCII) {  in _do_data_output()
746 		if (popt->verbose > 0)  in _do_data_output()
753 		if (popt->verbose > 0)  in _do_data_output()
778 	else if (popt->verbose > 0 && icount) {  in _do_data_output()
781 		    popt->ncmd, sz_byte2, icount, sz_bytes);  in _do_data_output()
784 		verbose_dump_buffer(pr, icount + popt->ncmd, popt->lsb);  in _do_data_output()
797 	icount = popt->count + popt->ncmd;  in perform_read()
803 		err = -1;  in perform_read()
810 	if (popt->pcmd && popt->ncmd > 0)  in perform_read()
811 		memcpy(pw, popt->pcmd, popt->ncmd);  in perform_read()
816 		err = -2;  in perform_read()
822 	err = _read_write(hdev, pw, pr, icount, popt->lsb);  in perform_read()
824 	if (!err && popt->count > 0)  in perform_read()
846 		err = -1;  in perform_write()
850 	err = _read_write(hdev, pw, NULL, popt->count + popt->ncmd, popt->lsb);  in perform_write()
868 	icount = popt->count + popt->ncmd; /* assign after fn call */  in perform_readwrite()
871 		err = -1;  in perform_readwrite()
878 		err = -2;  in perform_readwrite()
884 	err = _read_write(hdev, pw, pr, icount, popt->lsb);  in perform_readwrite()