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spi: core: add spi_split_transfers_maxsize

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Add spi_split_transfers_maxsize method that splits
spi_transfers transparently into multiple transfers
that are below the given max-size.

This makes use of the spi_res framework via
spi_replace_transfers to allocate/free the extra
transfers as well as reverting back the changes applied
while processing the spi_message.

Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Martin Sperl 2015-12-14 15:20:20 +00:00 • committed by Mark Brown
parent 523baf5a06
commit d9f1212272
2 changed files with 126 additions and 0 deletions
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15
include/linux/spi/spi.h
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@ -53,6 +53,10 @@ extern struct bus_type spi_bus_type;
*
* @transfer_bytes_histo:
* transfer bytes histogramm
*
* @transfers_split_maxsize:
* number of transfers that have been split because of
* maxsize limit
*/
struct spi_statistics {
spinlock_t lock; /* lock for the whole structure */
@ -72,6 +76,8 @@ struct spi_statistics {
#define SPI_STATISTICS_HISTO_SIZE 17
unsigned long transfer_bytes_histo[SPI_STATISTICS_HISTO_SIZE];
unsigned long transfers_split_maxsize;
};
void spi_statistics_add_transfer_stats(struct spi_statistics *stats,
@ -935,6 +941,15 @@ extern struct spi_replaced_transfers *spi_replace_transfers(
/*---------------------------------------------------------------------------*/
/* SPI transfer transformation methods */
extern int spi_split_transfers_maxsize(struct spi_master *master,
struct spi_message *msg,
size_t maxsize,
gfp_t gfp);
/*---------------------------------------------------------------------------*/
/* All these synchronous SPI transfer routines are utilities layered
* over the core async transfer primitive. Here, "synchronous" means
* they will sleep uninterruptibly until the async transfer completes.