diff --git a/libsigrok4DSL/backend.c b/libsigrok4DSL/backend.c
index 8c4c9400..c4ff7086 100644
--- a/libsigrok4DSL/backend.c
+++ b/libsigrok4DSL/backend.c
@@ -325,9 +325,13 @@ SR_PRIV int sr_init(struct sr_context **ctx)
 	}
 	memset(context, 0, sizeof(struct sr_context));
 
+	sr_info("bbb:%s:%d", __func__, __LINE__);
+
 	ret = libusb_init(&context->libusb_ctx);
+	
 	if (LIBUSB_SUCCESS != ret) {
-		sr_err("libusb_init() returned %s.\n", libusb_error_name(ret));
+		sr_err("%s:%d, Failed to init lib. Error name:%s", 
+			__func__, __LINE__, libusb_error_name(ret));
 		ret = SR_ERR;
 		goto done;
 	}
diff --git a/libsigrok4DSL/hardware/DSL/dsl.c b/libsigrok4DSL/hardware/DSL/dsl.c
index 14effc32..8023b930 100644
--- a/libsigrok4DSL/hardware/DSL/dsl.c
+++ b/libsigrok4DSL/hardware/DSL/dsl.c
@@ -368,7 +368,8 @@ static int hw_dev_open(struct sr_dev_driver *di, struct sr_dev_inst *sdi)
     rd_cmd.data = rd_cmd_data;
 
     if ((ret = command_ctl_rd(usb->devhdl, rd_cmd)) != SR_OK) {
-        sr_err("Failed to get firmware version.");
+        sr_err("%s:%d, Failed to get firmware version.",
+                __func__, __LINE__);
         ds_set_last_error(SR_ERR_DEVICE_USB_IO_ERROR);
         return ret;
     }
@@ -1894,7 +1895,8 @@ SR_PRIV int dsl_dev_open(struct sr_dev_driver *di, struct sr_dev_inst *sdi, gboo
     rd_cmd.data = &hw_info;
 
     if ((ret = command_ctl_rd(usb->devhdl, rd_cmd)) != SR_OK) {
-        sr_err("Failed to get hardware infos.");
+        sr_err("%s:%d, Failed to get hardware information.",
+            __func__, __LINE__);
         ds_set_last_error(SR_ERR_DEVICE_USB_IO_ERROR);
         return SR_ERR;
     }
@@ -1927,7 +1929,8 @@ SR_PRIV int dsl_dev_open(struct sr_dev_driver *di, struct sr_dev_inst *sdi, gboo
             g_free(fpga_bit);
 
             if (ret != SR_OK) {
-                sr_err("%s: Configure FPGA failed!", __func__);
+                sr_err("%s:%d, Configure FPGA failed!",
+                    __func__, __LINE__);
                 ds_set_last_error(SR_ERR_DEVICE_USB_IO_ERROR);
                 return SR_ERR;
             }
@@ -1938,7 +1941,8 @@ SR_PRIV int dsl_dev_open(struct sr_dev_driver *di, struct sr_dev_inst *sdi, gboo
             ret = dsl_hdl_version(sdi, &hw_info);
 
             if ((ret != SR_OK)) {
-               sr_err("%s: Failed to get FPGA bin version!", __func__);
+               sr_err("%s:%d, Failed to get FPGA bin version!",
+                        __func__, __LINE__);
                ds_set_last_error(SR_ERR_DEVICE_USB_IO_ERROR);
                sdi->status = SR_ST_INACTIVE;
                return SR_ERR;
@@ -1958,7 +1962,8 @@ SR_PRIV int dsl_dev_open(struct sr_dev_driver *di, struct sr_dev_inst *sdi, gboo
     uint16_t encryption[SECU_STEPS];
     ret = dsl_wr_reg(sdi, CTR0_ADDR, bmNONE); // dessert clear
     if (dsl_rd_nvm(sdi, (unsigned char *)encryption, SECU_EEP_ADDR, SECU_STEPS*2) != SR_OK) {
-        sr_err("Read EEPROM content failed!");
+        sr_err("%s:%d, Read EEPROM content failed!",
+            __func__, __LINE__);
         ds_set_last_error(SR_ERR_DEVICE_USB_IO_ERROR);
         return SR_ERR;
     }
diff --git a/libsigrok4DSL/hardware/DSL/dslogic.c b/libsigrok4DSL/hardware/DSL/dslogic.c
index b6e138aa..166737b8 100644
--- a/libsigrok4DSL/hardware/DSL/dslogic.c
+++ b/libsigrok4DSL/hardware/DSL/dslogic.c
@@ -1282,6 +1282,8 @@ static int dev_open(struct sr_dev_inst *sdi)
             ret = dsl_wr_reg(sdi, VTH_ADDR, (uint8_t)(devc->vth/5.0*255));
         
         if (ret != SR_OK){
+            sr_err("%s:%d, Failed to call dsl_wr_reg()!",
+                        __func__, __LINE__);
             ds_set_last_error(SR_ERR_DEVICE_USB_IO_ERROR);
             return ret;
         }