diff options
| author | Thomas Andrews <tandrews@grok.co.za> | 2006-07-26 21:47:41 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-08-06 20:52:13 -0700 |
| commit | f1a360dce49a51350f255fcd8d89fb132a9c3b60 (patch) | |
| tree | 5bf808d1c4fcac3195bae704ade9585e32a40585 | |
| parent | 4f40508af128fc5ead71aab6e9932039d2a07fd4 (diff) | |
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>
| -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 766cc969c4d0..69f24c6f39c9 100644 --- a/drivers/i2c/busses/scx200_acb.c +++ b/drivers/i2c/busses/scx200_acb.c @@ -181,21 +181,21 @@ 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: |