summaryrefslogtreecommitdiffstats
path: root/include/linux/spi/spi.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux/spi/spi.h')
-rw-r--r--include/linux/spi/spi.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index af56071b06f9..92e52a1e6af3 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -213,6 +213,9 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
* @dma_alignment: SPI controller constraint on DMA buffers alignment.
* @mode_bits: flags understood by this controller driver
* @flags: other constraints relevant to this driver
+ * @bus_lock_spinlock: spinlock for SPI bus locking
+ * @bus_lock_mutex: mutex for SPI bus locking
+ * @bus_lock_flag: indicates that the SPI bus is locked for exclusive use
* @setup: updates the device mode and clocking records used by a
* device's SPI controller; protocol code may call this. This
* must fail if an unrecognized or unsupported mode is requested.
@@ -262,6 +265,13 @@ 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 +552,8 @@ 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 +563,9 @@ 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
OpenPOWER on IntegriCloud