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authorDavid Brownell <david-b@pacbell.net>2007-07-17 04:04:02 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-17 10:23:04 -0700
commitdccd573bb02aa011a4a7146c02c409ac0bd722a0 (patch)
tree743eeca4fbbea8272ca4f341b806d776e404d704 /drivers/spi/atmel_spi.c
parentff294cba8a62fa8334b88692da6d48683900f015 (diff)
downloadop-kernel-dev-dccd573bb02aa011a4a7146c02c409ac0bd722a0.zip
op-kernel-dev-dccd573bb02aa011a4a7146c02c409ac0bd722a0.tar.gz
SPI controller drivers: check for unsupported modes
Minor SPI controller driver updates: make the setup() methods reject spi->mode bits they don't support, by masking aginst the inverse of bits they *do* support. This insures against misbehavior later when new mode bits get added. Most controllers can't support SPI_LSB_FIRST; more handle SPI_CS_HIGH. Support for all four SPI clock/transfer modes is routine. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/spi/atmel_spi.c')
-rw-r--r--drivers/spi/atmel_spi.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/spi/atmel_spi.c b/drivers/spi/atmel_spi.c
index 8b2601d..7524a84 100644
--- a/drivers/spi/atmel_spi.c
+++ b/drivers/spi/atmel_spi.c
@@ -350,6 +350,7 @@ atmel_spi_interrupt(int irq, void *dev_id)
return ret;
}
+/* the spi->mode bits understood by this driver: */
#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH)
static int atmel_spi_setup(struct spi_device *spi)
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