diff --git a/backend.c b/backend.c
index f290e579..4e657ac5 100644
--- a/backend.c
+++ b/backend.c
@@ -23,6 +23,8 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
+#define LOG_PREFIX "backend"
+
 extern struct sr_session *session;
 
 /**
diff --git a/device.c b/device.c
index e5411a45..87031a9a 100644
--- a/device.c
+++ b/device.c
@@ -23,14 +23,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "device: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "device"
 
 /**
  * @file
diff --git a/filter.c b/filter.c
index 11610157..eaf69e5c 100644
--- a/filter.c
+++ b/filter.c
@@ -24,14 +24,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "filter: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "filter"
 
 /**
  * @file
diff --git a/hardware/agilent-dmm/agilent-dmm.h b/hardware/agilent-dmm/agilent-dmm.h
index 43fed240..2277111f 100644
--- a/hardware/agilent-dmm/agilent-dmm.h
+++ b/hardware/agilent-dmm/agilent-dmm.h
@@ -20,14 +20,7 @@
 #ifndef LIBSIGROK_HARDWARE_AGILENT_DMM_AGILENT_DMM_H
 #define LIBSIGROK_HARDWARE_AGILENT_DMM_AGILENT_DMM_H
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "agilent-dmm: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "agilent-dmm"
 
 #define AGDMM_BUFSIZE  256
 
diff --git a/hardware/alsa/protocol.h b/hardware/alsa/protocol.h
index e844bc74..d8688929 100644
--- a/hardware/alsa/protocol.h
+++ b/hardware/alsa/protocol.h
@@ -28,14 +28,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "alsa: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "alsa"
 
 /** Private, per-device-instance driver context. */
 struct dev_context {
diff --git a/hardware/appa-55ii/protocol.h b/hardware/appa-55ii/protocol.h
index d7c83858..38a35564 100644
--- a/hardware/appa-55ii/protocol.h
+++ b/hardware/appa-55ii/protocol.h
@@ -25,14 +25,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "appa-55ii: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "appa-55ii"
 
 #define APPA_55II_NUM_PROBES  2
 #define APPA_55II_BUF_SIZE    (4 + 32 + 1)
diff --git a/hardware/asix-sigma/asix-sigma.h b/hardware/asix-sigma/asix-sigma.h
index 0fbcd936..74178b1c 100644
--- a/hardware/asix-sigma/asix-sigma.h
+++ b/hardware/asix-sigma/asix-sigma.h
@@ -22,14 +22,7 @@
 #ifndef LIBSIGROK_HARDWARE_ASIX_SIGMA_ASIX_SIGMA_H
 #define LIBSIGROK_HARDWARE_ASIX_SIGMA_ASIX_SIGMA_H
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "asix-sigma: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "asix-sigma"
 
 enum sigma_write_register {
 	WRITE_CLOCK_SELECT	= 0,
diff --git a/hardware/brymen-dmm/protocol.h b/hardware/brymen-dmm/protocol.h
index 28bf38f5..e6d2e560 100644
--- a/hardware/brymen-dmm/protocol.h
+++ b/hardware/brymen-dmm/protocol.h
@@ -28,14 +28,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "brymen-dmm: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "brymen-dmm"
 
 #define DMM_BUFSIZE 256
 
diff --git a/hardware/cem-dt-885x/protocol.h b/hardware/cem-dt-885x/protocol.h
index 85a0ea77..233ef860 100644
--- a/hardware/cem-dt-885x/protocol.h
+++ b/hardware/cem-dt-885x/protocol.h
@@ -25,14 +25,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "cem-dt-885x: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "cem-dt-885x"
 
 /* When retrieving samples from device memory, group this many
  * together into a sigrok packet. */
diff --git a/hardware/center-3xx/protocol.h b/hardware/center-3xx/protocol.h
index 10179db3..71e2630d 100644
--- a/hardware/center-3xx/protocol.h
+++ b/hardware/center-3xx/protocol.h
@@ -29,14 +29,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "center-3xx: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "center-3xx"
 
 /* Note: When adding entries here, don't forget to update CENTER_DEV_COUNT. */
 enum {
diff --git a/hardware/chronovu-la8/protocol.h b/hardware/chronovu-la8/protocol.h
index 80926550..cd71936c 100644
--- a/hardware/chronovu-la8/protocol.h
+++ b/hardware/chronovu-la8/protocol.h
@@ -27,14 +27,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "la8: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "la8"
 
 #define USB_VENDOR_ID			0x0403
 #define USB_DESCRIPTION			"ChronoVu LA8"
diff --git a/hardware/colead-slm/protocol.h b/hardware/colead-slm/protocol.h
index 1460f4d6..8942ac85 100644
--- a/hardware/colead-slm/protocol.h
+++ b/hardware/colead-slm/protocol.h
@@ -24,14 +24,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "colead-slm: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "colead-slm"
 
 enum {
 	IDLE,
diff --git a/hardware/common/dmm/es51922.c b/hardware/common/dmm/es51922.c
index 09563f93..cadd7cb7 100644
--- a/hardware/common/dmm/es51922.c
+++ b/hardware/common/dmm/es51922.c
@@ -31,14 +31,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "es51922: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "es51922"
 
 /* Factors for the respective measurement mode (0 means "invalid"). */
 static const float factors[8][8] = {
diff --git a/hardware/common/dmm/es519xx.c b/hardware/common/dmm/es519xx.c
index a3f5efbd..99942295 100644
--- a/hardware/common/dmm/es519xx.c
+++ b/hardware/common/dmm/es519xx.c
@@ -32,14 +32,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "es519xx: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "es519xx"
 
 /* Factors for the respective measurement mode (0 means "invalid"). */
 static const float factors_2400_11b[8][8] = {
diff --git a/hardware/common/dmm/fs9721.c b/hardware/common/dmm/fs9721.c
index 705da3cc..9b195d0b 100644
--- a/hardware/common/dmm/fs9721.c
+++ b/hardware/common/dmm/fs9721.c
@@ -38,14 +38,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "fs9721: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "fs9721"
 
 static int parse_digit(uint8_t b)
 {
diff --git a/hardware/common/dmm/fs9922.c b/hardware/common/dmm/fs9922.c
index 51d3c654..c5fd63b8 100644
--- a/hardware/common/dmm/fs9922.c
+++ b/hardware/common/dmm/fs9922.c
@@ -29,14 +29,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "fs9922: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "fs9922"
 
 static gboolean flags_valid(const struct fs9922_info *info)
 {
diff --git a/hardware/common/dmm/m2110.c b/hardware/common/dmm/m2110.c
index 9184ab4f..8a84420f 100644
--- a/hardware/common/dmm/m2110.c
+++ b/hardware/common/dmm/m2110.c
@@ -31,15 +31,6 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "bbcgm-m2110: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
-
 SR_PRIV gboolean sr_m2110_packet_valid(const uint8_t *buf)
 {
 	float val;
diff --git a/hardware/common/dmm/metex14.c b/hardware/common/dmm/metex14.c
index 4a37efe0..4e66c97c 100644
--- a/hardware/common/dmm/metex14.c
+++ b/hardware/common/dmm/metex14.c
@@ -34,14 +34,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "metex14: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "metex14"
 
 static int parse_value(const uint8_t *buf, float *result)
 {
diff --git a/hardware/common/dmm/rs9lcd.c b/hardware/common/dmm/rs9lcd.c
index 4328aefd..4f6b0680 100644
--- a/hardware/common/dmm/rs9lcd.c
+++ b/hardware/common/dmm/rs9lcd.c
@@ -35,14 +35,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "rs9lcd: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "rs91lcd"
 
 /* Byte 1 of the packet, and the modes it represents */
 #define IND1_HZ		(1 << 7)
diff --git a/hardware/common/ezusb.c b/hardware/common/ezusb.c
index 476ccb21..044b4642 100644
--- a/hardware/common/ezusb.c
+++ b/hardware/common/ezusb.c
@@ -30,14 +30,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "ezusb: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "ezusb"
 
 SR_PRIV int ezusb_reset(struct libusb_device_handle *hdl, int set_clear)
 {
diff --git a/hardware/common/scpi.c b/hardware/common/scpi.c
index 4992b736..78a06fd1 100644
--- a/hardware/common/scpi.c
+++ b/hardware/common/scpi.c
@@ -23,13 +23,7 @@
 #include <glib.h>
 #include <string.h>
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "scpi: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "scpi"
 
 #define SCPI_READ_RETRIES 100
 #define SCPI_READ_RETRY_TIMEOUT 10000
diff --git a/hardware/common/scpi_serial.c b/hardware/common/scpi_serial.c
index 6c5415c5..dc099634 100644
--- a/hardware/common/scpi_serial.c
+++ b/hardware/common/scpi_serial.c
@@ -24,13 +24,7 @@
 #include <glib.h>
 #include <string.h>
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "scpi_serial: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "scpi_serial"
 
 #define SCPI_READ_RETRIES 100
 #define SCPI_READ_RETRY_TIMEOUT 10000
diff --git a/hardware/common/scpi_tcp.c b/hardware/common/scpi_tcp.c
index e4572871..af2db140 100644
--- a/hardware/common/scpi_tcp.c
+++ b/hardware/common/scpi_tcp.c
@@ -37,13 +37,7 @@
 #endif
 #include <errno.h>
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "scpi_tcp: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "scpi_tcp"
 
 struct scpi_tcp {
 	char *address;
diff --git a/hardware/common/scpi_usbtmc.c b/hardware/common/scpi_usbtmc.c
index 9648722c..298e3ab5 100644
--- a/hardware/common/scpi_usbtmc.c
+++ b/hardware/common/scpi_usbtmc.c
@@ -26,13 +26,7 @@
 #include <fcntl.h>
 #include <errno.h>
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "scpi_usbtmc: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "scpi_usbtmc"
 
 SR_PRIV int scpi_usbtmc_open(void *priv)
 {
diff --git a/hardware/common/serial.c b/hardware/common/serial.c
index 891fd02d..a7376af0 100644
--- a/hardware/common/serial.c
+++ b/hardware/common/serial.c
@@ -26,14 +26,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "serial: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "serial"
 
 /**
  * Open the specified serial port.
diff --git a/hardware/common/usb.c b/hardware/common/usb.c
index 0de54b90..6e678fdb 100644
--- a/hardware/common/usb.c
+++ b/hardware/common/usb.c
@@ -33,14 +33,7 @@
 #define SUBCLASS_USBTMC 0x03
 #define USBTMC_USB488   0x01
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "usb: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "usb"
 
 /**
  * Find USB devices according to a connection string.
diff --git a/hardware/demo/demo.c b/hardware/demo/demo.c
index d4836b89..f5ba2596 100644
--- a/hardware/demo/demo.c
+++ b/hardware/demo/demo.c
@@ -31,14 +31,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "demo: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "demo"
 
 /* TODO: Number of probes should be configurable. */
 #define NUM_PROBES           8
diff --git a/hardware/fluke-dmm/fluke-dmm.h b/hardware/fluke-dmm/fluke-dmm.h
index f1ec8ce9..4291be06 100644
--- a/hardware/fluke-dmm/fluke-dmm.h
+++ b/hardware/fluke-dmm/fluke-dmm.h
@@ -20,14 +20,7 @@
 #ifndef LIBSIGROK_HARDWARE_FLUKE_DMM_FLUKE_DMM_H
 #define LIBSIGROK_HARDWARE_FLUKE_DMM_FLUKE_DMM_H
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "fluke-dmm: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "fluke-dmm"
 
 #define FLUKEDMM_BUFSIZE  256
 
diff --git a/hardware/fx2lafw/protocol.h b/hardware/fx2lafw/protocol.h
index 76ef63d5..c23db39a 100644
--- a/hardware/fx2lafw/protocol.h
+++ b/hardware/fx2lafw/protocol.h
@@ -29,14 +29,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "fx2lafw: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "fx2lafw"
 
 #define USB_INTERFACE		0
 #define USB_CONFIGURATION	1
diff --git a/hardware/gmc-mh-1x-2x/protocol.h b/hardware/gmc-mh-1x-2x/protocol.h
index e3a4ce42..9d742e3c 100644
--- a/hardware/gmc-mh-1x-2x/protocol.h
+++ b/hardware/gmc-mh-1x-2x/protocol.h
@@ -25,14 +25,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "gmc-mh-1x-2x: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "gmc-mh-1x-2x"
 
 #define GMC_BUFSIZE  266
 
diff --git a/hardware/hameg-hmo/protocol.h b/hardware/hameg-hmo/protocol.h
index 370bc008..ffc84128 100644
--- a/hardware/hameg-hmo/protocol.h
+++ b/hardware/hameg-hmo/protocol.h
@@ -26,14 +26,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "hameg-hmo: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "hameg-hmo"
 
 #define MAX_INSTRUMENT_VERSIONS 10
 #define MAX_COMMAND_SIZE 31
diff --git a/hardware/hantek-dso/dso.h b/hardware/hantek-dso/dso.h
index 2c4f4c39..16826db2 100644
--- a/hardware/hantek-dso/dso.h
+++ b/hardware/hantek-dso/dso.h
@@ -22,14 +22,7 @@
 #ifndef LIBSIGROK_HARDWARE_HANTEK_DSO_DSO_H
 #define LIBSIGROK_HARDWARE_HANTEK_DSO_DSO_H
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "hantek-dso: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "hantek-dso"
 
 #define USB_INTERFACE           0
 #define USB_CONFIGURATION       1
diff --git a/hardware/ikalogic-scanalogic2/protocol.h b/hardware/ikalogic-scanalogic2/protocol.h
index 8324204e..add5dda8 100644
--- a/hardware/ikalogic-scanalogic2/protocol.h
+++ b/hardware/ikalogic-scanalogic2/protocol.h
@@ -27,14 +27,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "ikalogic-scanalogic2: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "ikalogic-scanalogic2"
 
 #define VENDOR_NAME			"IKALOGIC"
 #define MODEL_NAME			"Scanalogic-2"
diff --git a/hardware/ikalogic-scanaplus/protocol.h b/hardware/ikalogic-scanaplus/protocol.h
index e736f838..dd7660da 100644
--- a/hardware/ikalogic-scanaplus/protocol.h
+++ b/hardware/ikalogic-scanaplus/protocol.h
@@ -28,14 +28,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "scanaplus: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "scanaplus"
 
 #define COMPRESSED_BUF_SIZE		(64 * 1024)
 
diff --git a/hardware/kecheng-kc-330b/protocol.h b/hardware/kecheng-kc-330b/protocol.h
index eabda85b..09152b9f 100644
--- a/hardware/kecheng-kc-330b/protocol.h
+++ b/hardware/kecheng-kc-330b/protocol.h
@@ -25,14 +25,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "kecheng-kc-330b: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "kecheng-kc-330b"
 
 #define EP_IN 0x80 | 1
 #define EP_OUT 2
diff --git a/hardware/lascar-el-usb/protocol.h b/hardware/lascar-el-usb/protocol.h
index 16e826a0..4386ef4b 100644
--- a/hardware/lascar-el-usb/protocol.h
+++ b/hardware/lascar-el-usb/protocol.h
@@ -24,14 +24,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "lascar-el-usb: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "lascar-el-usb"
 
 #define LASCAR_VENDOR "Lascar"
 #define LASCAR_INTERFACE 0
diff --git a/hardware/link-mso19/protocol.h b/hardware/link-mso19/protocol.h
index e4d7e999..85426723 100644
--- a/hardware/link-mso19/protocol.h
+++ b/hardware/link-mso19/protocol.h
@@ -29,14 +29,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "mso19: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "mso19"
 
 #define USB_VENDOR		"3195"
 #define USB_PRODUCT		"f190"
diff --git a/hardware/mic-985xx/protocol.h b/hardware/mic-985xx/protocol.h
index 5b2efb3a..279cca5b 100644
--- a/hardware/mic-985xx/protocol.h
+++ b/hardware/mic-985xx/protocol.h
@@ -28,14 +28,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "mic-985xx: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "mic-985xx"
 
 /* Note: When adding entries here, don't forget to update MIC_DEV_COUNT. */
 enum {
diff --git a/hardware/norma-dmm/protocol.h b/hardware/norma-dmm/protocol.h
index e9a956e3..2ed0e250 100644
--- a/hardware/norma-dmm/protocol.h
+++ b/hardware/norma-dmm/protocol.h
@@ -29,14 +29,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "norma-dmm: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "norma-dmm"
 
 #define NMADMM_BUFSIZE  256
 
diff --git a/hardware/openbench-logic-sniffer/protocol.h b/hardware/openbench-logic-sniffer/protocol.h
index b9e16e9c..333605ee 100644
--- a/hardware/openbench-logic-sniffer/protocol.h
+++ b/hardware/openbench-logic-sniffer/protocol.h
@@ -26,14 +26,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "ols: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "ols"
 
 #define NUM_PROBES             32
 #define NUM_TRIGGER_STAGES     4
diff --git a/hardware/rigol-ds/protocol.h b/hardware/rigol-ds/protocol.h
index 853fbe6e..d1c67fd8 100644
--- a/hardware/rigol-ds/protocol.h
+++ b/hardware/rigol-ds/protocol.h
@@ -26,14 +26,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "rigol-ds: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "rigol-ds"
 
 #define DS1000_ANALOG_LIVE_WAVEFORM_SIZE 600
 #define DS2000_ANALOG_LIVE_WAVEFORM_SIZE 1400
diff --git a/hardware/saleae-logic16/protocol.h b/hardware/saleae-logic16/protocol.h
index 6faa8b68..db19498a 100644
--- a/hardware/saleae-logic16/protocol.h
+++ b/hardware/saleae-logic16/protocol.h
@@ -27,14 +27,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "saleae-logic16: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "saleae-logic16"
 
 enum voltage_range {
 	VOLTAGE_RANGE_UNKNOWN,
diff --git a/hardware/serial-dmm/protocol.h b/hardware/serial-dmm/protocol.h
index 57d5ea19..22264573 100644
--- a/hardware/serial-dmm/protocol.h
+++ b/hardware/serial-dmm/protocol.h
@@ -20,14 +20,7 @@
 #ifndef LIBSIGROK_HARDWARE_SERIAL_DMM_PROTOCOL_H
 #define LIBSIGROK_HARDWARE_SERIAL_DMM_PROTOCOL_H
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "serial-dmm: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "serial-dmm"
 
 /* Note: When adding entries here, don't forget to update DMM_COUNT. */
 enum {
diff --git a/hardware/teleinfo/protocol.h b/hardware/teleinfo/protocol.h
index 46d2efb3..f95c50eb 100644
--- a/hardware/teleinfo/protocol.h
+++ b/hardware/teleinfo/protocol.h
@@ -25,14 +25,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "teleinfo: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "teleinfo"
 
 enum optarif {
 	OPTARIF_NONE,
diff --git a/hardware/tondaj-sl-814/protocol.h b/hardware/tondaj-sl-814/protocol.h
index 5ff051d5..027b66df 100644
--- a/hardware/tondaj-sl-814/protocol.h
+++ b/hardware/tondaj-sl-814/protocol.h
@@ -25,14 +25,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "tondaj-sl-814: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "tondaj-sl-814"
 
 /** Private, per-device-instance driver context. */
 struct dev_context {
diff --git a/hardware/uni-t-dmm/protocol.h b/hardware/uni-t-dmm/protocol.h
index ea8a1a4c..a6a8f718 100644
--- a/hardware/uni-t-dmm/protocol.h
+++ b/hardware/uni-t-dmm/protocol.h
@@ -27,14 +27,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "uni-t-dmm: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "uni-t-dmm"
 
 enum {
 	TECPEL_DMM_8061,
diff --git a/hardware/uni-t-ut32x/protocol.h b/hardware/uni-t-ut32x/protocol.h
index 42cf01d1..8513117c 100644
--- a/hardware/uni-t-ut32x/protocol.h
+++ b/hardware/uni-t-ut32x/protocol.h
@@ -25,14 +25,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "uni-t-ut32x: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "uni-t-ut32x"
 
 #define DEFAULT_DATA_SOURCE DATA_SOURCE_LIVE
 #define USB_CONN "1a86.e008"
diff --git a/hardware/victor-dmm/protocol.h b/hardware/victor-dmm/protocol.h
index 92539004..8f126803 100644
--- a/hardware/victor-dmm/protocol.h
+++ b/hardware/victor-dmm/protocol.h
@@ -24,14 +24,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "victor-dmm: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "victor-dmm"
 
 #define DMM_DATA_SIZE 14
 
diff --git a/hardware/zeroplus-logic-cube/protocol.h b/hardware/zeroplus-logic-cube/protocol.h
index 64fca809..718dd217 100644
--- a/hardware/zeroplus-logic-cube/protocol.h
+++ b/hardware/zeroplus-logic-cube/protocol.h
@@ -28,14 +28,7 @@
 #include "libsigrok-internal.h"
 #include "analyzer.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "zeroplus: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "zeroplus"
 
 /* Private, per-device-instance driver context. */
 struct dev_context {
diff --git a/hwdriver.c b/hwdriver.c
index a94acc9e..83582ad2 100644
--- a/hwdriver.c
+++ b/hwdriver.c
@@ -27,14 +27,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "hwdriver: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "hwdriver"
 
 /**
  * @file
diff --git a/input/binary.c b/input/binary.c
index 70bad29c..dfeedee7 100644
--- a/input/binary.c
+++ b/input/binary.c
@@ -26,14 +26,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "input/binary: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "input/binary"
 
 #define CHUNKSIZE             (512 * 1024)
 #define DEFAULT_NUM_PROBES    8
diff --git a/input/chronovu_la8.c b/input/chronovu_la8.c
index 0fa21adc..4c785427 100644
--- a/input/chronovu_la8.c
+++ b/input/chronovu_la8.c
@@ -25,14 +25,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "input/chronovu-la8: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "input/chronovu-l8"
 
 #define NUM_PACKETS		2048
 #define PACKET_SIZE		4096
diff --git a/input/csv.c b/input/csv.c
index e11c554a..65c6b3f9 100644
--- a/input/csv.c
+++ b/input/csv.c
@@ -23,14 +23,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "input/csv: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "input/csv"
 
 /*
  * The CSV input module has the following options:
diff --git a/input/vcd.c b/input/vcd.c
index b10da20b..d20d4a64 100644
--- a/input/vcd.c
+++ b/input/vcd.c
@@ -63,14 +63,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "input/vcd: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "input/vcd"
 
 #define DEFAULT_NUM_PROBES 8
 #define CHUNKSIZE 1024
diff --git a/input/wav.c b/input/wav.c
index 92f6bfb5..0106a586 100644
--- a/input/wav.c
+++ b/input/wav.c
@@ -25,14 +25,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "input/wav: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "input/wav"
 
 #define CHUNK_SIZE 4096
 
diff --git a/libsigrok-internal.h b/libsigrok-internal.h
index 82d6d791..61978c29 100644
--- a/libsigrok-internal.h
+++ b/libsigrok-internal.h
@@ -162,6 +162,16 @@ SR_PRIV int sr_info(const char *format, ...);
 SR_PRIV int sr_warn(const char *format, ...);
 SR_PRIV int sr_err(const char *format, ...);
 
+/* Message logging helpers with subsystem-specific prefix string. */
+#ifndef NO_LOG_WRAPPERS
+#define sr_log(l, s, args...) sr_log(l, "%s: " s, LOG_PREFIX, ## args)
+#define sr_spew(s, args...) sr_spew("%s: " s, LOG_PREFIX, ## args)
+#define sr_dbg(s, args...) sr_dbg("%s: " s, LOG_PREFIX, ## args)
+#define sr_info(s, args...) sr_info("%s: " s, LOG_PREFIX, ## args)
+#define sr_warn(s, args...) sr_warn("%s: " s, LOG_PREFIX, ## args)
+#define sr_err(s, args...) sr_err("%s: " s, LOG_PREFIX, ## args)
+#endif
+
 /*--- device.c --------------------------------------------------------------*/
 
 SR_PRIV struct sr_probe *sr_probe_new(int index, int type,
diff --git a/log.c b/log.c
index d6b29302..a4ca4bc5 100644
--- a/log.c
+++ b/log.c
@@ -21,6 +21,7 @@
 #include <stdarg.h>
 #include <stdio.h>
 #include "libsigrok.h"
+#define NO_LOG_WRAPPERS
 #include "libsigrok-internal.h"
 
 /**
diff --git a/output/analog.c b/output/analog.c
index 58341e13..9873a8f5 100644
--- a/output/analog.c
+++ b/output/analog.c
@@ -24,14 +24,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "output/analog: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "output/analog"
 
 struct context {
 	int num_enabled_probes;
diff --git a/output/binary.c b/output/binary.c
index 2fd858eb..dd0cf474 100644
--- a/output/binary.c
+++ b/output/binary.c
@@ -24,14 +24,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "output/binary: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "output/binary:"
 
 static int data(struct sr_output *o, const uint8_t *data_in,
 		uint64_t length_in, uint8_t **data_out, uint64_t *length_out)
diff --git a/output/chronovu_la8.c b/output/chronovu_la8.c
index 54fbfa34..47b421d9 100644
--- a/output/chronovu_la8.c
+++ b/output/chronovu_la8.c
@@ -24,14 +24,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "output/chronovu-la8: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "output/chronovu-la8"
 
 struct context {
 	unsigned int num_enabled_probes;
diff --git a/output/csv.c b/output/csv.c
index 3eda9bf9..51cc8572 100644
--- a/output/csv.c
+++ b/output/csv.c
@@ -25,14 +25,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "output/csv: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "output/csv"
 
 struct context {
 	unsigned int num_enabled_probes;
diff --git a/output/gnuplot.c b/output/gnuplot.c
index e93556f8..29508cef 100644
--- a/output/gnuplot.c
+++ b/output/gnuplot.c
@@ -25,14 +25,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "output/gnuplot: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "output/gnuplot"
 
 struct context {
 	unsigned int num_enabled_probes;
diff --git a/output/ols.c b/output/ols.c
index 3c6e5941..0e220534 100644
--- a/output/ols.c
+++ b/output/ols.c
@@ -31,14 +31,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "output/ols: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "output/ols"
 
 struct context {
 	uint64_t samplerate;
diff --git a/output/text/ascii.c b/output/text/ascii.c
index 147ff60e..61c5a2ad 100644
--- a/output/text/ascii.c
+++ b/output/text/ascii.c
@@ -25,14 +25,7 @@
 #include "libsigrok-internal.h"
 #include "text.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "output/ascii: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "output/ascii"
 
 SR_PRIV int init_ascii(struct sr_output *o)
 {
diff --git a/output/text/bits.c b/output/text/bits.c
index e0a9812c..ff149650 100644
--- a/output/text/bits.c
+++ b/output/text/bits.c
@@ -25,14 +25,7 @@
 #include "libsigrok-internal.h"
 #include "text.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "output/bits: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "output/bits"
 
 SR_PRIV int init_bits(struct sr_output *o)
 {
diff --git a/output/text/hex.c b/output/text/hex.c
index 1c2757cc..e9102608 100644
--- a/output/text/hex.c
+++ b/output/text/hex.c
@@ -25,14 +25,7 @@
 #include "libsigrok-internal.h"
 #include "text.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "output/hex: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "output/hex"
 
 SR_PRIV int init_hex(struct sr_output *o)
 {
diff --git a/output/text/text.c b/output/text/text.c
index 7263224d..68566121 100644
--- a/output/text/text.c
+++ b/output/text/text.c
@@ -27,14 +27,7 @@
 #include "libsigrok-internal.h"
 #include "text.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "output/text: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "output/text"
 
 SR_PRIV void flush_linebufs(struct context *ctx, uint8_t *outbuf)
 {
diff --git a/output/vcd.c b/output/vcd.c
index 60ec58c3..d1526c1b 100644
--- a/output/vcd.c
+++ b/output/vcd.c
@@ -26,14 +26,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "output/vcd: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "output/vcd"
 
 struct context {
 	int num_enabled_probes;
diff --git a/session.c b/session.c
index 9130aa67..e1fb5cfb 100644
--- a/session.c
+++ b/session.c
@@ -25,14 +25,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "session: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "session"
 
 /**
  * @file
diff --git a/session_driver.c b/session_driver.c
index 5041092b..b023cbc0 100644
--- a/session_driver.c
+++ b/session_driver.c
@@ -26,14 +26,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "virtual-session: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "virtual-session"
 
 /* size of payloads sent across the session bus */
 /** @cond PRIVATE */
diff --git a/session_file.c b/session_file.c
index d720dd59..27e54095 100644
--- a/session_file.c
+++ b/session_file.c
@@ -30,14 +30,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "session-file: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "session-file"
 
 /**
  * @file
diff --git a/std.c b/std.c
index b6b6f6c7..727ee6e9 100644
--- a/std.c
+++ b/std.c
@@ -27,6 +27,8 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
+#define LOG_PREFIX "std"
+
 /**
  * Standard sr_driver_init() API helper.
  *
diff --git a/strutil.c b/strutil.c
index f8644d72..40ffc4dc 100644
--- a/strutil.c
+++ b/strutil.c
@@ -25,14 +25,7 @@
 #include "libsigrok.h"
 #include "libsigrok-internal.h"
 
-/* Message logging helpers with subsystem-specific prefix string. */
-#define LOG_PREFIX "strutil: "
-#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
-#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
-#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
-#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
-#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
-#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
+#define LOG_PREFIX "strutil"
 
 /**
  * @file