other versions
- jessie 3.16.56-1+deb8u1
SPI_BUS_LOCK(9) | Serial Peripheral Interface (S | SPI_BUS_LOCK(9) |
NAME¶
spi_bus_lock - obtain a lock for exclusive SPI bus usageSYNOPSIS¶
int
spi_bus_lock(struct spi_master * master);
ARGUMENTS¶
masterSPI bus master that should be locked for exclusive bus
access
CONTEXT¶
can sleepDESCRIPTION¶
This call may only be used from a context that may sleep. The sleep is non-interruptible, and has no timeout. This call should be used by drivers that require exclusive access to the SPI bus. The SPI bus must be released by a spi_bus_unlock call when the exclusive access is over. Data transfer must be done by spi_sync_locked and spi_async_locked calls when the SPI bus lock is held. It returns zero on success, else a negative error code.COPYRIGHT¶
May 2018 | Kernel Hackers Manual 3.16 |