| SPI_BUS_LOCK(9) | Serial Peripheral Interface (S | SPI_BUS_LOCK(9) |
NAME¶
spi_bus_lock - obtain a lock for exclusive SPI bus usage
SYNOPSIS¶
int spi_bus_lock(struct spi_master * master);
ARGUMENTS¶
master
SPI bus master that should be locked for exclusive bus
access
CONTEXT¶
can sleep
DESCRIPTION¶
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¶
| June 2024 | Kernel Hackers Manual 3.10 |