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| author | Thomas Andrews <tandrews@grok.co.za> | 2006-07-01 19:05:12 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-07-13 02:43:06 +0400 |
| commit | fd627a01477dadaef3bc8556e5e9d0ef80310c3a (patch) | |
| tree | 36e25979b44ad7de31e412d2b1a8fe77fca0d3ea /drivers/i2c | |
| parent | 39288e1ac10b3b9a68a629be67d81a0b53512c4e (diff) | |
| download | linux-fd627a01477dadaef3bc8556e5e9d0ef80310c3a.tar.xz | |
[PATCH] scx200_acb: Fix the state machine
Fix the scx200_acb state machine:
* Nack was sent one byte too late on reads >= 2 bytes.
* Stop bit was set one byte too late on reads.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/scx200_acb.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/i2c/busses/scx200_acb.c b/drivers/i2c/busses/scx200_acb.c index 22a3eda04166..454086affaa1 100644 --- a/drivers/i2c/busses/scx200_acb.c +++ b/drivers/i2c/busses/scx200_acb.c @@ -184,21 +184,21 @@ static void scx200_acb_machine(struct scx200_acb_iface *iface, u8 status) break; case state_read: - /* Set ACK if receiving the last byte */ - if (iface->len == 1) + /* Set ACK if _next_ byte will be the last one */ + if (iface->len == 2) outb(inb(ACBCTL1) | ACBCTL1_ACK, ACBCTL1); else outb(inb(ACBCTL1) & ~ACBCTL1_ACK, ACBCTL1); - *iface->ptr++ = inb(ACBSDA); - --iface->len; - - if (iface->len == 0) { + if (iface->len == 1) { iface->result = 0; iface->state = state_idle; outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1); } + *iface->ptr++ = inb(ACBSDA); + --iface->len; + break; case state_write: |