Loopback mode is supported by various controllers, this mode
is useful for testing, especially in conjunction with spidev
driver.
Signed-off-by: Anton Vorontsov <[EMAIL PROTECTED]>
---
drivers/spi/spidev.c | 2 +-
include/linux/spi/spi.h | 1 +
include/linux/spi/spidev.h | 1 +
3 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
index 4c51a61..24c8d4d 100644
--- a/drivers/spi/spidev.c
+++ b/drivers/spi/spidev.c
@@ -57,7 +57,7 @@ static unsigned long minors[N_SPI_MINORS / BITS_PER_LONG];
/* Bit masks for spi_device.mode management */
#define SPI_MODE_MASK (SPI_CPHA | SPI_CPOL | SPI_CS_HIGH | \
- SPI_LSB_FIRST | SPI_3WIRE)
+ SPI_LSB_FIRST | SPI_3WIRE | SPI_LOOP)
struct spidev_data {
struct device dev;
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 302b81d..e180615 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -77,6 +77,7 @@ struct spi_device {
#define SPI_CS_HIGH 0x04 /* chipselect active
high? */
#define SPI_LSB_FIRST 0x08 /* per-word
bits-on-wire */
#define SPI_3WIRE 0x10 /* SI/SO signals shared
*/
+#define SPI_LOOP 0x20 /* loopback mode */
u8 bits_per_word;
int irq;
void *controller_state;
diff --git a/include/linux/spi/spidev.h b/include/linux/spi/spidev.h
index 369d42e..c93ef9d 100644
--- a/include/linux/spi/spidev.h
+++ b/include/linux/spi/spidev.h
@@ -38,6 +38,7 @@
#define SPI_CS_HIGH 0x04
#define SPI_LSB_FIRST 0x08
#define SPI_3WIRE 0x10
+#define SPI_LOOP 0x20
/*---------------------------------------------------------------------------*/
--
1.5.0.6
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