| SPI_ALLOC_MASTER(9) - phpMan
SPI_ALLOC_MASTER(9) Serial Peripheral Interface (S SPI_ALLOC_MASTER(9)
NAME
spi_alloc_master - allocate SPI master controller
SYNOPSIS
struct spi_master * spi_alloc_master(struct device * dev, unsigned size);
ARGUMENTS
dev
the controller, possibly using the platform_bus
size
how much zeroed driver-private data to allocate; the pointer to this memory is in the
driver_data field of the returned device, accessible with spi_master_get_devdata.
CONTEXT
can sleep
DESCRIPTION
This call is used only by SPI master controller drivers, which are the only ones directly
touching chip registers. It's how they allocate an spi_master structure, prior to calling
spi_register_master.
This must be called from context that can sleep.
The caller is responsible for assigning the bus number and initializing the master's
methods before calling spi_register_master; and (after errors adding the device) calling
spi_master_put to prevent a memory leak.
RETURN
the SPI master structure on success, else NULL.
COPYRIGHT
Kernel Hackers Manual 4.8. January 2017 SPI_ALLOC_MASTER(9)
|