2  * Chromium OS cros_ec driver - SPI interface
6  * SPDX-License-Identifier:	GPL-2.0+
20 #include <spi.h>
27 	struct spi_slave *slave = dev_get_parent_priv(dev->dev);  in cros_ec_spi_packet()  local
33 	if (spi_claim_bus(slave)) {  in cros_ec_spi_packet()
34 		debug("%s: Cannot claim SPI bus\n", __func__);  in cros_ec_spi_packet()
35 		return -1;  in cros_ec_spi_packet()
38 	rv = spi_xfer(slave, out_bytes * 8, dev->dout, NULL, SPI_XFER_BEGIN);  in cros_ec_spi_packet()
43 		rv = spi_xfer(slave, 8, NULL, &byte, 0);  in cros_ec_spi_packet()
49 			rv = -ETIMEDOUT;  in cros_ec_spi_packet()
54 	rv = spi_xfer(slave, in_bytes * 8, NULL, dev->din, 0);  in cros_ec_spi_packet()
56 	spi_xfer(slave, 0, NULL, NULL, SPI_XFER_END);  in cros_ec_spi_packet()
57 	spi_release_bus(slave);  in cros_ec_spi_packet()
60 		debug("%s: Cannot complete SPI transfer\n", __func__);  in cros_ec_spi_packet()
61 		return -1;  in cros_ec_spi_packet()
80  * @return number of bytes in response, or -1 on error
87 	struct spi_slave *slave = dev_get_parent_priv(dev->dev);  in cros_ec_spi_command()  local
94 	if (dev->protocol_version != 2) {  in cros_ec_spi_command()
96 		      __func__, dev->protocol_version);  in cros_ec_spi_command()
97 		return -1;  in cros_ec_spi_command()
101 	 * Sanity-check input size to make sure it plus transaction overhead  in cros_ec_spi_command()
104 	if (in_bytes > sizeof(dev->din)) {  in cros_ec_spi_command()
106 		return -1;  in cros_ec_spi_command()
112 		return -1;  in cros_ec_spi_command()
118 	memset(dev->din, '\0', in_bytes);  in cros_ec_spi_command()
120 	if (spi_claim_bus(slave)) {  in cros_ec_spi_command()
121 		debug("%s: Cannot claim SPI bus\n", __func__);  in cros_ec_spi_command()
122 		return -1;  in cros_ec_spi_command()
125 	out = dev->dout;  in cros_ec_spi_command()
138 	p = dev->din + sizeof(int64_t) - 2;  in cros_ec_spi_command()
141 	rv = spi_xfer(slave, max(len, in_bytes) * 8, out, p,  in cros_ec_spi_command()
144 	spi_release_bus(slave);  in cros_ec_spi_command()
147 		debug("%s: Cannot complete SPI transfer\n", __func__);  in cros_ec_spi_command()
148 		return -1;  in cros_ec_spi_command()
152 	cros_ec_dump_data("in", -1, p, len + 3);  in cros_ec_spi_command()
157 		return -(int)(p[0]);  in cros_ec_spi_command()
165 		return -1;  in cros_ec_spi_command()
185 	{ .compatible = "google,cros-ec-spi" },