diff options
| author | Martin Sperl <kernel@martin.sperl.org> | 2015-12-14 15:20:20 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2016-02-09 19:32:07 +0000 |
| commit | d9f1212272818420fcde611a940c1ad611a8b785 (patch) | |
| tree | 0799bc9b7950503331bfbb384fbda85a427b9eeb /include/linux/spi | |
| parent | 523baf5a0609690cb742b3662b7ccac0ea0b2ef2 (diff) | |
spi: core: add spi_split_transfers_maxsize
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>
Diffstat (limited to 'include/linux/spi')
| -rw-r--r-- | include/linux/spi/spi.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index d71385756fee..3c02b4d06268 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -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. |