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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>
This commit is contained in:
Andy Shevchenko 2015-02-27 17:34:15 +02:00 committed by Mark Brown
parent c517d838eb
commit b716c4ffc6
2 changed files with 7 additions and 0 deletions
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3
drivers/spi/spi.c
View File

@ -851,6 +851,9 @@ static int spi_transfer_one_message(struct spi_master *master,
if (msg->status == -EINPROGRESS)
msg->status = ret;
if (msg->status)
master->handle_err(master, msg);
spi_finalize_current_message(master);
return ret;

4
include/linux/spi/spi.h
View File

@ -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;