printf() unconditionally prints to the console which disturbs `-serial stdio`.
Fix that by converting into a trace event. While at it, add some tracing for
read and write access.

Fixes: 7e7c5e4c1ba5 "Nokia N800 machine support (ARM)."
Signed-off-by: Bernhard Beschow <shentey@gmail.com>
---
 meson.build            | 1 +
 hw/sensor/trace.h      | 1 +
 hw/sensor/tmp105.c     | 7 ++++++-
 hw/sensor/trace-events | 6 ++++++
 4 files changed, 14 insertions(+), 1 deletion(-)
 create mode 100644 hw/sensor/trace.h
 create mode 100644 hw/sensor/trace-events

diff --git a/meson.build b/meson.build
index 2c9086a3fe..19df8d7125 100644
--- a/meson.build
+++ b/meson.build
@@ -3476,6 +3476,7 @@ if have_system
     'hw/s390x',
     'hw/scsi',
     'hw/sd',
+    'hw/sensor',
     'hw/sh4',
     'hw/sparc',
     'hw/sparc64',
diff --git a/hw/sensor/trace.h b/hw/sensor/trace.h
new file mode 100644
index 0000000000..e4721560b0
--- /dev/null
+++ b/hw/sensor/trace.h
@@ -0,0 +1 @@
+#include "trace/trace-hw_sensor.h"
diff --git a/hw/sensor/tmp105.c b/hw/sensor/tmp105.c
index 9d7b911f59..ef2824f3e1 100644
--- a/hw/sensor/tmp105.c
+++ b/hw/sensor/tmp105.c
@@ -27,6 +27,7 @@
 #include "qapi/visitor.h"
 #include "qemu/module.h"
 #include "hw/registerfields.h"
+#include "trace.h"
 
 FIELD(CONFIG, SHUTDOWN_MODE,        0, 1)
 FIELD(CONFIG, THERMOSTAT_MODE,      1, 1)
@@ -150,17 +151,21 @@ static void tmp105_read(TMP105State *s)
         s->buf[s->len++] = ((uint16_t) s->limit[1]) >> 0;
         break;
     }
+
+    trace_tmp105_read(s->i2c.address, s->pointer);
 }
 
 static void tmp105_write(TMP105State *s)
 {
+    trace_tmp105_write(s->i2c.address, s->pointer);
+
     switch (s->pointer & 3) {
     case TMP105_REG_TEMPERATURE:
         break;
 
     case TMP105_REG_CONFIG:
         if (FIELD_EX8(s->buf[0] & ~s->config, CONFIG, SHUTDOWN_MODE)) {
-            printf("%s: TMP105 shutdown\n", __func__);
+            trace_tmp105_write_shutdown(s->i2c.address);
         }
         s->config = FIELD_DP8(s->buf[0], CONFIG, ONE_SHOT, 0);
         s->faults = tmp105_faultq[FIELD_EX8(s->config, CONFIG, FAULT_QUEUE)];
diff --git a/hw/sensor/trace-events b/hw/sensor/trace-events
new file mode 100644
index 0000000000..a3fe54fa6d
--- /dev/null
+++ b/hw/sensor/trace-events
@@ -0,0 +1,6 @@
+# See docs/devel/tracing.rst for syntax documentation.
+
+# tmp105.c
+tmp105_read(uint8_t dev, uint8_t addr) "device: 0x%02x, addr: 0x%02x"
+tmp105_write(uint8_t dev, uint8_t addr) "device: 0x%02x, addr 0x%02x"
+tmp105_write_shutdown(uint8_t dev) "device: 0x%02x"
-- 
2.47.0

On 3/11/24 11:33, Bernhard Beschow wrote:
> printf() unconditionally prints to the console which disturbs `-serial stdio`.
> Fix that by converting into a trace event. While at it, add some tracing for
> read and write access.
> 
> Fixes: 7e7c5e4c1ba5 "Nokia N800 machine support (ARM)."
> Signed-off-by: Bernhard Beschow <shentey@gmail.com>
> ---
>   meson.build            | 1 +
>   hw/sensor/trace.h      | 1 +
>   hw/sensor/tmp105.c     | 7 ++++++-
>   hw/sensor/trace-events | 6 ++++++
>   4 files changed, 14 insertions(+), 1 deletion(-)
>   create mode 100644 hw/sensor/trace.h
>   create mode 100644 hw/sensor/trace-events

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>