Add a member to spi_master allowing to better handle SPI chips with a message size HW limit.
Signed-off-by: Heiner Kallweit <[email protected]> --- v2: add accessor include/linux/spi/spi.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index cce80e6..a8abd24 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -302,6 +302,7 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv) * and it's up to the individual driver to perform any validation. * @min_speed_hz: Lowest supported transfer speed * @max_speed_hz: Highest supported transfer speed + * @max_msg_size: maximum supported message size * @flags: other constraints relevant to this driver * @bus_lock_spinlock: spinlock for SPI bus locking * @bus_lock_mutex: mutex for SPI bus locking @@ -417,6 +418,9 @@ struct spi_master { u32 min_speed_hz; u32 max_speed_hz; + /* maximum message size */ + size_t max_msg_size; + /* other constraints relevant to this driver */ u16 flags; #define SPI_MASTER_HALF_DUPLEX BIT(0) /* can't do full duplex */ @@ -556,6 +560,11 @@ static inline void spi_master_put(struct spi_master *master) put_device(&master->dev); } +static inline size_t spi_master_get_max_msg_size(struct spi_master *master) +{ + return master->max_msg_size; +} + /* PM calls that need to be issued by the driver */ extern int spi_master_suspend(struct spi_master *master); extern int spi_master_resume(struct spi_master *master); -- 2.6.2 -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
