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| author | Martin Sperl <kernel@martin.sperl.org> | 2015-12-14 18:20:19 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2016-02-09 22:32:07 +0300 |
| commit | 523baf5a0609690cb742b3662b7ccac0ea0b2ef2 (patch) | |
| tree | e1b05ea7c4287cf1da5a72d4d0e446e3946165da /include/linux/spi/spi.h | |
| parent | d780c3711d9df9bacd56b71cf23443b895a331ca (diff) | |
| download | linux-523baf5a0609690cb742b3662b7ccac0ea0b2ef2.tar.xz | |
spi: core: add spi_replace_transfers method
Add the spi_replace_transfers method that can get used
to replace some spi_transfers from a spi_message with other
transfers.
Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include/linux/spi/spi.h')
| -rw-r--r-- | include/linux/spi/spi.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index 38204b584dc5..d71385756fee 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -890,6 +890,51 @@ spi_max_transfer_size(struct spi_device *spi) /*---------------------------------------------------------------------------*/ +/* SPI transfer replacement methods which make use of spi_res */ + +/** + * struct spi_replaced_transfers - structure describing the spi_transfer + * replacements that have occurred + * so that they can get reverted + * @release: some extra release code to get executed prior to + * relasing this structure + * @extradata: pointer to some extra data if requested or NULL + * @replaced_transfers: transfers that have been replaced and which need + * to get restored + * @replaced_after: the transfer after which the @replaced_transfers + * are to get re-inserted + * @inserted: number of transfers inserted + * @inserted_transfers: array of spi_transfers of array-size @inserted, + * that have been replacing replaced_transfers + * + * note: that @extradata will point to @inserted_transfers[@inserted] + * if some extra allocation is requested, so alignment will be the same + * as for spi_transfers + */ +struct spi_replaced_transfers; +typedef void (*spi_replaced_release_t)(struct spi_master *master, + struct spi_message *msg, + struct spi_replaced_transfers *res); +struct spi_replaced_transfers { + spi_replaced_release_t release; + void *extradata; + struct list_head replaced_transfers; + struct list_head *replaced_after; + size_t inserted; + struct spi_transfer inserted_transfers[]; +}; + +extern struct spi_replaced_transfers *spi_replace_transfers( + struct spi_message *msg, + struct spi_transfer *xfer_first, + size_t remove, + size_t insert, + spi_replaced_release_t release, + size_t extradatasize, + 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. |