Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c06e677aed0c86480b01faa894967daa8aa3568a
Commit: c06e677aed0c86480b01faa894967daa8aa3568a
Parent: dccd573bb02aa011a4a7146c02c409ac0bd722a0
Author: David Brownell <[EMAIL PROTECTED]>
AuthorDate: Tue Jul 17 04:04:03 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Tue Jul 17 10:23:04 2007 -0700
SPI: add 3wire mode flag
Add a new spi->mode bit: SPI_3WIRE, for chips where the SI and SO signals
are shared (and which are thus only half duplex). Update the LM70 driver
to require support for that hardware mode from the controller.
Signed-off-by: David Brownell <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
drivers/hwmon/lm70.c | 4 ++++
include/linux/spi/spi.h | 1 +
2 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/drivers/hwmon/lm70.c b/drivers/hwmon/lm70.c
index 7eaae38..275d392 100644
--- a/drivers/hwmon/lm70.c
+++ b/drivers/hwmon/lm70.c
@@ -96,6 +96,10 @@ static int __devinit lm70_probe(struct spi_device *spi)
struct lm70 *p_lm70;
int status;
+ /* signaling is SPI_MODE_0 on a 3-wire link (shared SI/SO) */
+ if ((spi->mode & (SPI_CPOL|SPI_CPHA)) || !(spi->mode & SPI_3WIRE))
+ return -EINVAL;
+
p_lm70 = kzalloc(sizeof *p_lm70, GFP_KERNEL);
if (!p_lm70)
return -ENOMEM;
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 1be5ea0..302b81d 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -76,6 +76,7 @@ struct spi_device {
#define SPI_MODE_3 (SPI_CPOL|SPI_CPHA)
#define SPI_CS_HIGH 0x04 /* chipselect active
high? */
#define SPI_LSB_FIRST 0x08 /* per-word
bits-on-wire */
+#define SPI_3WIRE 0x10 /* SI/SO signals shared
*/
u8 bits_per_word;
int irq;
void *controller_state;
-
To unsubscribe from this list: send the line "unsubscribe git-commits-head" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
