diff options
| -rw-r--r-- | hw/parallel.c | 12 | ||||
| -rw-r--r-- | qemu-char.h | 1 | ||||
| -rw-r--r-- | vl.c | 4 |
3 files changed, 17 insertions, 0 deletions
diff --git a/hw/parallel.c b/hw/parallel.c index 8402eadf9b..66bc715fa4 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; diff --git a/qemu-char.h b/qemu-char.h index 2746472d58..c01e590e54 100644 --- a/qemu-char.h +++ b/qemu-char.h @@ -27,6 +27,7 @@ typedef struct { #define CHR_IOCTL_PP_EPP_READ 9 #define CHR_IOCTL_PP_EPP_WRITE_ADDR 10 #define CHR_IOCTL_PP_EPP_WRITE 11 +#define CHR_IOCTL_PP_DATA_DIR 12 #define CHR_IOCTL_SERIAL_SET_TIOCM 12 #define CHR_IOCTL_SERIAL_GET_TIOCM 13 @@ -2835,6 +2835,10 @@ static int pp_ioctl(CharDriverState *chr, int cmd, void *arg) return -ENOTSUP; *(uint8_t *)arg = b; break; + case CHR_IOCTL_PP_DATA_DIR: + if (ioctl(fd, PPDATADIR, (int *)arg) < 0) + return -ENOTSUP; + break; case CHR_IOCTL_PP_EPP_READ_ADDR: if (pp_hw_mode(drv, IEEE1284_MODE_EPP|IEEE1284_ADDR)) { struct ParallelIOArg *parg = arg; |