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Date: Wed, 30 Jul 2008 21:50:02 -0500 From: David Fries <david@...es.net> To: Andrew Morton <akpm@...ux-foundation.org> Cc: Evgeniy Polyakov <johnpol@....mipt.ru>, linux-kernel@...r.kernel.org Subject: [PATCH 21/30] 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@...es.net> Signed-off-by: Evgeniy Polyakov <johnpol@....mipt.ru> --- 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 6b188e8..6fabf58 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; -- 1.4.4.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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