I2O_MSG_POST_WAIT_ME(9) Message-based devices I2O_MSG_POST_WAIT_ME(9)NAME
i2o_msg_post_wait_mem - Post and wait a message with DMA buffers
SYNOPSIS
int i2o_msg_post_wait_mem(struct i2o_controller * c, struct i2o_message * msg, unsigned long timeout, struct i2o_dma * dma);
ARGUMENTS
c
controller
msg
message to post
timeout
time in seconds to wait
dma
i2o_dma struct of the DMA buffer to free on failure
DESCRIPTION
This API allows an OSM to post a message and then be told whether or not the system received a successful reply. If the message times out
then the value '-ETIMEDOUT' is returned. This is a special case. In this situation the message may (should) complete at an indefinite time
in the future. When it completes it will use the memory buffer attached to the request. If -ETIMEDOUT is returned then the memory buffer
must not be freed. Instead the event completion will free them for you. In all other cases the buffer are your problem.
Returns 0 on success, negative error code on timeout or positive error code from reply.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 I2O_MSG_POST_WAIT_ME(9)
Check Out this Related Man Page
STRUCT SPI_MESSAGE(9) Serial Peripheral Interface (S STRUCT SPI_MESSAGE(9)NAME
struct_spi_message - one multi-segment SPI transaction
SYNOPSIS
struct spi_message {
struct list_head transfers;
struct spi_device * spi;
unsigned is_dma_mapped:1;
void (* complete) (void *context);
void * context;
unsigned actual_length;
int status;
struct list_head queue;
void * state;
};
MEMBERS
transfers
list of transfer segments in this transaction
spi
SPI device to which the transaction is queued
is_dma_mapped
if true, the caller provided both dma and cpu virtual addresses for each transfer buffer
complete
called to report transaction completions
context
the argument to complete when it's called
actual_length
the total number of bytes that were transferred in all successful segments
status
zero for success, else negative errno
queue
for use by whichever driver currently owns the message
state
for use by whichever driver currently owns the message
DESCRIPTION
A spi_message is used to execute an atomic sequence of data transfers, each represented by a struct spi_transfer. The sequence is "atomic"
in the sense that no other spi_message may use that SPI bus until that sequence completes. On some systems, many such sequences can execute
as as single programmed DMA transfer. On all systems, these messages are queued, and might complete after transactions to other devices.
Messages sent to a given spi_device are alway executed in FIFO order.
The code that submits an spi_message (and its spi_transfers) to the lower layers is responsible for managing its memory. Zero-initialize
every field you don't set up explicitly, to insulate against future API updates. After you submit a message and its transfers, ignore them
until its completion callback.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 STRUCT SPI_MESSAGE(9)
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