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authorDavid Brownell <dbrownell@users.sourceforge.net>2009-06-18 01:26:04 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-18 22:03:42 +0200
commite7db06b5d5afcef15c4c3e61c3a7441ed7ad1407 (patch)
treec0d1e01d49fdb3f288da28ffc3b349810c4e1b61 /drivers/spi/spi.c
parentspi: move common spi_setup() functionality into core (diff)
downloadlinux-e7db06b5d5afcef15c4c3e61c3a7441ed7ad1407.tar.xz
linux-e7db06b5d5afcef15c4c3e61c3a7441ed7ad1407.zip
spi: move more spi_setup() functionality into core
Move some common spi_setup() error checks into the SPI framework from the spi_master controller drivers: - Add a new "mode_bits" field to spi_master - Use that in spi_setup to validate the spi->mode value being requested. Setting this new field is now mandatory for any controller supporting more than vanilla SPI_MODE_0. - Update all spi_master drivers to: * Initialize that field * Remove current spi_setup() checks using that value. This is a net minor code shrink. 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/spi.c')
-rw-r--r--drivers/spi/spi.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 0276bc37e255..a525a3a848c1 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -607,8 +607,19 @@ EXPORT_SYMBOL_GPL(spi_busnum_to_master);
*/
int spi_setup(struct spi_device *spi)
{
+ unsigned bad_bits;
int status;
+ /* help drivers fail *cleanly* when they need options
+ * that aren't supported with their current master
+ */
+ bad_bits = spi->mode & ~spi->master->mode_bits;
+ if (bad_bits) {
+ dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
+ bad_bits);
+ return -EINVAL;
+ }
+
if (!spi->bits_per_word)
spi->bits_per_word = 8;