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W1: ds2490.c ds_write_bit, grouping error, disable readback

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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 <[email protected]>
Signed-off-by: Evgeniy Polyakov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
David Fries 2008-10-15 22:05:04 -07:00 • committed by Linus Torvalds
commit e1c86d226d
1 changed files with 6 additions and 1 deletions
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7
drivers/w1/masters/ds2490.c
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@ -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;