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spi: core: add spi_replace_transfers method

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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>
This commit is contained in:
Martin Sperl
2015-12-14 15:20:19 +00:00
committed by Mark Brown
parent d780c3711d
commit 523baf5a06
2 changed files with 177 additions and 0 deletions
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45
include/linux/spi/spi.h
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@@ -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.