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authorMartin Sperl <kernel@martin.sperl.org>2015-12-14 18:20:19 +0300
committerMark Brown <broonie@kernel.org>2016-02-09 22:32:07 +0300
commit523baf5a0609690cb742b3662b7ccac0ea0b2ef2 (patch)
treee1b05ea7c4287cf1da5a72d4d0e446e3946165da /include/linux/spi
parentd780c3711d9df9bacd56b71cf23443b895a331ca (diff)
downloadlinux-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')
-rw-r--r--include/linux/spi/spi.h45
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.