Allows to see how the guest interacts with the device.

Signed-off-by: Bernhard Beschow <shentey@gmail.com>
---
 hw/audio/pcspk.c      | 10 +++++++++-
 hw/audio/trace-events |  4 ++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/hw/audio/pcspk.c b/hw/audio/pcspk.c
index a419161b5b..f8020593b0 100644
--- a/hw/audio/pcspk.c
+++ b/hw/audio/pcspk.c
@@ -34,6 +34,7 @@
 #include "hw/audio/pcspk.h"
 #include "qapi/error.h"
 #include "qom/object.h"
+#include "trace.h"
 
 #define PCSPK_BUF_LEN 1792
 #define PCSPK_SAMPLE_RATE 32000
@@ -137,13 +138,18 @@ static uint64_t pcspk_io_read(void *opaque, hwaddr addr,
 {
     PCSpkState *s = opaque;
     PITChannelInfo ch;
+    uint8_t val;
 
     pit_get_channel_info(s->pit, 2, &ch);
 
     s->dummy_refresh_clock ^= (1 << 4);
 
-    return ch.gate | (s->data_on << 1) | s->dummy_refresh_clock |
+    val = ch.gate | (s->data_on << 1) | s->dummy_refresh_clock |
        (ch.out << 5);
+
+    trace_pcspk_io_read(s->iobase, val);
+
+    return val;
 }
 
 static void pcspk_io_write(void *opaque, hwaddr addr, uint64_t val,
@@ -152,6 +158,8 @@ static void pcspk_io_write(void *opaque, hwaddr addr, uint64_t val,
     PCSpkState *s = opaque;
     const int gate = val & 1;
 
+    trace_pcspk_io_write(s->iobase, val);
+
     s->data_on = (val >> 1) & 1;
     pit_set_gate(s->pit, 2, gate);
     if (s->voice) {
diff --git a/hw/audio/trace-events b/hw/audio/trace-events
index b8ef572767..30f5921545 100644
--- a/hw/audio/trace-events
+++ b/hw/audio/trace-events
@@ -23,6 +23,10 @@ hda_audio_format(const char *stream, int chan, const char *fmt, int freq) "st %s
 hda_audio_adjust(const char *stream, int pos) "st %s, pos %d"
 hda_audio_overrun(const char *stream) "st %s"
 
+# pcspk.c
+pcspk_io_read(uint16_t addr, uint8_t val) "[0x%"PRIx16"] -> 0x%"PRIx8
+pcspk_io_write(uint16_t addr, uint8_t val) "[0x%"PRIx16"] <- 0x%"PRIx8
+
 #via-ac97.c
 via_ac97_codec_write(uint8_t addr, uint16_t val) "0x%x <- 0x%x"
 via_ac97_sgd_fetch(uint32_t curr, uint32_t addr, char stop, char eol, char flag, uint32_t len) "curr=0x%x addr=0x%x %c%c%c len=%d"
-- 
2.51.1.dirty