I2O_PROC_IOP_REMOVE(9) Message-based devices I2O_PROC_IOP_REMOVE(9)NAME
i2o_proc_iop_remove - Removes an I2O controller from the i2o proc tree
SYNOPSIS
void i2o_proc_iop_remove(struct proc_dir_entry * dir, struct i2o_controller * c);
ARGUMENTS
dir
parent proc dir entry
c
I2O controller which should be removed
DESCRIPTION
Iterate over each i2o proc entry and search controller c. If it is found remove it from the tree.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 I2O_PROC_IOP_REMOVE(9)
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STRUCT SPI_MASTER(9) Serial Peripheral Interface (S STRUCT SPI_MASTER(9)NAME
struct_spi_master - interface to SPI master controller
SYNOPSIS
struct spi_master {
struct device dev;
s16 bus_num;
u16 num_chipselect;
u16 dma_alignment;
u16 mode_bits;
u16 flags;
#define SPI_MASTER_HALF_DUPLEX BIT(0)
#define SPI_MASTER_NO_RX BIT(1)
#define SPI_MASTER_NO_TX BIT(2)
int (* setup) (struct spi_device *spi);
int (* transfer) (struct spi_device *spi,struct spi_message *mesg);
void (* cleanup) (struct spi_device *spi);
};
MEMBERS
dev
device interface to this driver
bus_num
board-specific (and often SOC-specific) identifier for a given SPI controller.
num_chipselect
chipselects are used to distinguish individual SPI slaves, and are numbered from zero to num_chipselects. each slave has a chipselect
signal, but it's common that not every chipselect is connected to a slave.
dma_alignment
SPI controller constraint on DMA buffers alignment.
mode_bits
flags understood by this controller driver
flags
other constraints relevant to this driver
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. It's always safe to call this unless transfers are pending on the device whose settings
are being modified.
transfer
adds a message to the controller's transfer queue.
cleanup
frees controller-specific state
DESCRIPTION
Each SPI master controller can communicate with one or more spi_device children. These make a small bus, sharing MOSI, MISO and SCK signals
but not chip select signals. Each device may be configured to use a different clock rate, since those shared signals are ignored unless the
chip is selected.
The driver for an SPI controller manages access to those devices through a queue of spi_message transactions, copying data between CPU
memory and an SPI slave device. For each such message it queues, it calls the message's completion function when the transaction completes.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 STRUCT SPI_MASTER(9)
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