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-rw-r--r--include/linux/spi/spi.h12
-rw-r--r--include/linux/spi/spi_gpio.h5
2 files changed, 17 insertions, 0 deletions
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index af56071b06f9..ae0a5286f558 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -262,6 +262,13 @@ struct spi_master {
#define SPI_MASTER_NO_RX BIT(1) /* can't do buffer read */
#define SPI_MASTER_NO_TX BIT(2) /* can't do buffer write */
+ /* lock and mutex for SPI bus locking */
+ spinlock_t bus_lock_spinlock;
+ struct mutex bus_lock_mutex;
+
+ /* flag indicating that the SPI bus is locked for exclusive use */
+ bool bus_lock_flag;
+
/* Setup mode and clock, etc (spi driver may call many times).
*
* IMPORTANT: this may be called when transfers to another
@@ -542,6 +549,8 @@ static inline void spi_message_free(struct spi_message *m)
extern int spi_setup(struct spi_device *spi);
extern int spi_async(struct spi_device *spi, struct spi_message *message);
+extern int spi_async_locked(struct spi_device *spi,
+ struct spi_message *message);
/*---------------------------------------------------------------------------*/
@@ -551,6 +560,9 @@ extern int spi_async(struct spi_device *spi, struct spi_message *message);
*/
extern int spi_sync(struct spi_device *spi, struct spi_message *message);
+extern int spi_sync_locked(struct spi_device *spi, struct spi_message *message);
+extern int spi_bus_lock(struct spi_master *master);
+extern int spi_bus_unlock(struct spi_master *master);
/**
* spi_write - SPI synchronous write
diff --git a/include/linux/spi/spi_gpio.h b/include/linux/spi/spi_gpio.h
index ca6782ee4b9f..369b3d7d5b95 100644
--- a/include/linux/spi/spi_gpio.h
+++ b/include/linux/spi/spi_gpio.h
@@ -29,11 +29,16 @@
* SPI_GPIO_NO_CHIPSELECT to the controller_data:
* .controller_data = (void *) SPI_GPIO_NO_CHIPSELECT;
*
+ * If the MISO or MOSI pin is not available then it should be set to
+ * SPI_GPIO_NO_MISO or SPI_GPIO_NO_MOSI.
+ *
* If the bitbanged bus is later switched to a "native" controller,
* that platform_device and controller_data should be removed.
*/
#define SPI_GPIO_NO_CHIPSELECT ((unsigned long)-1l)
+#define SPI_GPIO_NO_MISO ((unsigned long)-1l)
+#define SPI_GPIO_NO_MOSI ((unsigned long)-1l)
/**
* struct spi_gpio_platform_data - parameter for bitbanged SPI master