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| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2015-02-27 17:34:15 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2015-03-06 19:41:56 +0000 |
| commit | b716c4ffc6a2b0bfbcf9619880f335be11b65708 (patch) | |
| tree | e9fce46a5b9a33fcfc9593763b78f6bc46c787ea | |
| parent | c517d838eb7d07bbe9507871fab3931deccff539 (diff) | |
| download | op-kernel-dev-b716c4ffc6a2b0bfbcf9619880f335be11b65708.zip op-kernel-dev-b716c4ffc6a2b0bfbcf9619880f335be11b65708.tar.gz | |
spi: introduce master->handle_err() callback
This callback would be useful to handle an error that occurs in the generic
implementation of transfer_one_message(). The good candidate for this is to
drain FIFO and / or to terminate DMA transfers when timeout happened.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
| -rw-r--r-- | drivers/spi/spi.c | 3 | ||||
| -rw-r--r-- | include/linux/spi/spi.h | 4 |
2 files changed, 7 insertions, 0 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index c64a3e5..31d4d9d 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -851,6 +851,9 @@ out: if (msg->status == -EINPROGRESS) msg->status = ret; + if (msg->status) + master->handle_err(master, msg); + spi_finalize_current_message(master); return ret; diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index ed9489d..4eaac3a 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -294,6 +294,8 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv) * transfer_one_message are mutually exclusive; when both * are set, the generic subsystem does not call your * transfer_one callback. + * @handle_err: the subsystem calls the driver to handle and error that occurs + * in the generic implementation of transfer_one_message(). * @unprepare_message: undo any work done by prepare_message(). * @cs_gpios: Array of GPIOs to use as chip select lines; one per CS * number. Any individual value may be -ENOENT for CS lines that @@ -448,6 +450,8 @@ struct spi_master { void (*set_cs)(struct spi_device *spi, bool enable); int (*transfer_one)(struct spi_master *master, struct spi_device *spi, struct spi_transfer *transfer); + void (*handle_err)(struct spi_master *master, + struct spi_message *message); /* gpio chip select */ int *cs_gpios; |
