1 // SPDX-License-Identifier: GPL-2.0+
17 /*-----------------------------------------------------------------------
22 #   define MAX_SPI_BYTES 32	/* Maximum number of bytes we can handle */
29 static unsigned int	cs;  variable
35 static int do_spi_xfer(int bus, int cs)  in do_spi_xfer()  argument
44 	snprintf(name, sizeof(name), "generic_%d:%d", bus, cs);  in do_spi_xfer()
47 		return -ENOMEM;  in do_spi_xfer()
48 	ret = spi_get_bus_and_cs(bus, cs, 1000000, mode, "spi_generic_drv",  in do_spi_xfer()
53 	slave = spi_setup_slave(bus, cs, 1000000, mode);  in do_spi_xfer()
55 		printf("Invalid device %d:%d\n", bus, cs);  in do_spi_xfer()
56 		return -EINVAL;  in do_spi_xfer()
68 		ret = -EIO;  in do_spi_xfer()
93  *     {dev} is the device number for controlling chip select (see TBD)
94  *     {num_bits} is the number of bits to send & receive (base 10)
116 				cs = simple_strtoul(cp+1, &cp, 10);  in do_spi()
118 				cs = bus;  in do_spi()
129 				tmp = *cp - '0';  in do_spi()
131 					tmp -= ('A' - '0') - 10;  in do_spi()
133 					tmp -= ('a' - 'A');  in do_spi()
151 	if (do_spi_xfer(bus, cs))  in do_spi()
162 	"[<bus>:]<cs>[.<mode>] <bit_len> <dout> - Send and receive bits\n"
163 	"<bus>     - Identifies the SPI bus\n"
164 	"<cs>      - Identifies the chip select\n"
165 	"<mode>    - Identifies the SPI mode to use\n"
166 	"<bit_len> - Number of bits to send (base 10)\n"
167 	"<dout>    - Hexadecimal string that gets sent"