diff options
Diffstat (limited to 'include/linux/spi')
| -rw-r--r-- | include/linux/spi/spi.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index 1619ed48e75d..8c62ba74dd91 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -853,6 +853,33 @@ static inline ssize_t spi_w8r16(struct spi_device *spi, u8 cmd) return (status < 0) ? status : result; } +/** + * spi_w8r16be - SPI synchronous 8 bit write followed by 16 bit big-endian read + * @spi: device with which data will be exchanged + * @cmd: command to be written before data is read back + * Context: can sleep + * + * This returns the (unsigned) sixteen bit number returned by the device in cpu + * endianness, or else a negative error code. Callable only from contexts that + * can sleep. + * + * This function is similar to spi_w8r16, with the exception that it will + * convert the read 16 bit data word from big-endian to native endianness. + * + */ +static inline ssize_t spi_w8r16be(struct spi_device *spi, u8 cmd) + +{ + ssize_t status; + __be16 result; + + status = spi_write_then_read(spi, &cmd, 1, &result, 2); + if (status < 0) + return status; + + return be16_to_cpu(result); +} + /*---------------------------------------------------------------------------*/ /* |