diff options
| -rw-r--r-- | drivers/misc/cros_ec.c | 12 | ||||
| -rw-r--r-- | drivers/misc/cros_ec_spi.c | 24 | ||||
| -rw-r--r-- | include/cros_ec.h | 13 |
3 files changed, 49 insertions, 0 deletions
diff --git a/drivers/misc/cros_ec.c b/drivers/misc/cros_ec.c index a7716b87f..5682d39ec 100644 --- a/drivers/misc/cros_ec.c +++ b/drivers/misc/cros_ec.c @@ -218,6 +218,11 @@ static int send_command_proto3(struct cros_ec_dev *dev, return in_bytes; switch (dev->interface) { +#ifdef CONFIG_CROS_EC_SPI + case CROS_EC_IF_SPI: + rv = cros_ec_spi_packet(dev, out_bytes, in_bytes); + break; +#endif case CROS_EC_IF_NONE: /* TODO: support protocol 3 for LPC, I2C; for now fall through */ default: @@ -665,6 +670,13 @@ static int cros_ec_check_version(struct cros_ec_dev *dev) * So for now, just read all the data anyway. */ + /* Try sending a version 3 packet */ + dev->protocol_version = 3; + if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req, sizeof(req), + (uint8_t **)&resp, sizeof(*resp)) > 0) { + return 0; + } + /* Try sending a version 2 packet */ dev->protocol_version = 2; if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req, sizeof(req), diff --git a/drivers/misc/cros_ec_spi.c b/drivers/misc/cros_ec_spi.c index ef7378260..7df709cc7 100644 --- a/drivers/misc/cros_ec_spi.c +++ b/drivers/misc/cros_ec_spi.c @@ -17,6 +17,30 @@ #include <cros_ec.h> #include <spi.h> +int cros_ec_spi_packet(struct cros_ec_dev *dev, int out_bytes, int in_bytes) +{ + int rv; + + /* Do the transfer */ + if (spi_claim_bus(dev->spi)) { + debug("%s: Cannot claim SPI bus\n", __func__); + return -1; + } + + rv = spi_xfer(dev->spi, max(out_bytes, in_bytes) * 8, + dev->dout, dev->din, + SPI_XFER_BEGIN | SPI_XFER_END); + + spi_release_bus(dev->spi); + + if (rv) { + debug("%s: Cannot complete SPI transfer\n", __func__); + return -1; + } + + return in_bytes; +} + /** * Send a command to a LPC CROS_EC device and return the reply. * diff --git a/include/cros_ec.h b/include/cros_ec.h index 1199d9233..84f9104d3 100644 --- a/include/cros_ec.h +++ b/include/cros_ec.h @@ -312,6 +312,19 @@ int cros_ec_spi_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version, uint8_t **dinp, int din_len); /** + * Send a packet to a CROS-EC device and return the response packet. + * + * Expects the request packet to be stored in dev->dout. Stores the response + * packet in dev->din. + * + * @param dev CROS-EC device + * @param out_bytes Size of request packet to output + * @param in_bytes Maximum size of response packet to receive + * @return number of bytes in response packet, or <0 on error + */ +int cros_ec_spi_packet(struct cros_ec_dev *dev, int out_bytes, int in_bytes); + +/** * Dump a block of data for a command. * * @param name Name for data (e.g. 'in', 'out') |