Am Donnerstag, den 21.08.2008, 10:46 +0200 schrieb Hendrik Sattler: > Hi, > > I contact you because you are mentioned in the MAINTAINERS file of > linux-2.6.26 for the mmc_spi drive and SPI subsystem. > > I want to share the bus with other SPI devices. The drivers mentions > pending updates that would allow that. > Are those available somewhere? > > If not, the changes seem to fairly trivial: change SPI controller > drivers to allow adding a spi_transfer to an spi_message during the > complete() callback or add another callback that can do this.
Hi, I have done this in a slightly different, rather simple way. I have added a new "transfer_end" callback function pointer to the spi_transfer structure. This function can have three return values: <0 ... stop spi message after the transfer 0 ... continue with next transfer 1 ... repeat current transfer If the transfer_end callback is not required, the function pointer must be set to NULL. I have modified the bitbang driver for this new functionality. In addition, the mmc_spi driver has been changed to make use of the callback function. It is necessary to pack all transfers that must be done without being interrupted into a single message. I have done a lot of testing with a SD card on a shared bus with a lot of other activity, and I couldn't see any problems. Regards, Erwin ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ spi-devel-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/spi-devel-general
