Parallel Port Direction Fix

The direction bit in the control register should not be directly

set using PPWCONTROL. The kernel gives the following debug message.

    parport0 (ppdev0): use data_reverse for this!

More over setting the data pins to forward mode does not work,
perhaps a bug in the Linux PP driver. The right way to do this is
to use PPDATADIR to set the direction. The patch checks if the
user is toggling the direction bit, and invokes PPDATADIR to
do the job.

Signed-off-by: Vijay Kumar B <vijaykumar@bravegnu.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5063 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 12 insertions, 0 deletions

diff --git a/hw/parallel.c b/hw/parallel.c
index 8402eadf9..66bc715fa 100644
--- a/hw/parallel.c
+++ b/hw/parallel.c
@@ -129,6 +129,7 @@ static void parallel_ioport_write_hw(void *opaque, uint32_t addr, uint32_t val)
 {
     ParallelState *s = opaque;
     uint8_t parm = val;
+    int dir;
 
     /* Sometimes programs do several writes for timing purposes on old
        HW. Take care not to waste time on writes that do nothing. */
@@ -154,6 +155,17 @@ static void parallel_ioport_write_hw(void *opaque, uint32_t addr, uint32_t val)
         if (s->control == val)
             return;
         pdebug("wc%02x\n", val);
+
+        if ((val & PARA_CTR_DIR) != (s->control & PARA_CTR_DIR)) {
+            if (val & PARA_CTR_DIR) {
+                dir = 1;
+            } else {
+                dir = 0;
+            }
+            qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_DATA_DIR, &dir);
+            parm &= ~PARA_CTR_DIR;
+        }
+
         qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_WRITE_CONTROL, &parm);
         s->control = val;
         break;