[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>

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: