From 8275c642ccdce09a2146d0a9eb022e3698ee927e Mon Sep 17 00:00:00 2001 From: Vitaly Wool Date: Sun, 8 Jan 2006 13:34:28 -0800 Subject: [PATCH] spi: use linked lists rather than an array This makes the SPI core and its users access transfers in the SPI message structure as linked list not as an array, as discussed on LKML. From: David Brownell Updates including doc, bugfixes to the list code, add spi_message_add_tail(). Plus, initialize things _before_ grabbing the locks in some cases (in case it grows more expensive). This also merges some bitbang updates of mine that didn't yet make it into the mm tree. Signed-off-by: Vitaly Wool Signed-off-by: Dmitry Pervushin Signed-off-by: David Brownell Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- include/linux/spi/spi_bitbang.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'include/linux/spi/spi_bitbang.h') diff --git a/include/linux/spi/spi_bitbang.h b/include/linux/spi/spi_bitbang.h index 8dfe61a445f4..c961fe9bf3eb 100644 --- a/include/linux/spi/spi_bitbang.h +++ b/include/linux/spi/spi_bitbang.h @@ -31,8 +31,15 @@ struct spi_bitbang { struct spi_master *master; void (*chipselect)(struct spi_device *spi, int is_on); +#define BITBANG_CS_ACTIVE 1 /* normally nCS, active low */ +#define BITBANG_CS_INACTIVE 0 + /* txrx_bufs() may handle dma mapping for transfers that don't + * already have one (transfer.{tx,rx}_dma is zero), or use PIO + */ int (*txrx_bufs)(struct spi_device *spi, struct spi_transfer *t); + + /* txrx_word[SPI_MODE_*]() just looks like a shift register */ u32 (*txrx_word[4])(struct spi_device *spi, unsigned nsecs, u32 word, u8 bits); -- cgit v1.2.1