diff options
| author | David Fries <david@fries.net> | 2008-10-15 22:05:04 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-10-16 11:21:50 -0700 |
| commit | e1c86d226daf95407d66246ced8fe087055acc6b (patch) | |
| tree | 8c65de40bc97dfb267a652251660efd77608bff9 /drivers/w1 | |
| parent | 1f4ec2d7f6c4560a9d0c1abab2e8effe9ba93921 (diff) | |
W1: ds2490.c ds_write_bit, grouping error, disable readback
ds_write_bit doesn't read the input buffer, so add COMM_ICP and a comment
that it will no longer generate a read back data byte. If there is an
extra data byte later on then it will cause an error and discard what data
was there. Corrected operator ordering for ds_send_control.
Signed-off-by: David Fries <david@fries.net>
Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/w1')
| -rw-r--r-- | drivers/w1/masters/ds2490.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/w1/masters/ds2490.c b/drivers/w1/masters/ds2490.c index 6b188e8008e..6fabf584395 100644 --- a/drivers/w1/masters/ds2490.c +++ b/drivers/w1/masters/ds2490.c @@ -525,7 +525,12 @@ static int ds_write_bit(struct ds_device *dev, u8 bit) int err; struct ds_status st; - err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | (bit) ? COMM_D : 0, 0); + /* Set COMM_ICP to write without a readback. Note, this will + * produce one time slot, a down followed by an up with COMM_D + * only determing the timing. + */ + err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | COMM_ICP | + (bit ? COMM_D : 0), 0); if (err) return err; |