Initial commit.

.gitignore

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+*.o
+usb-reset

LICENSE.txt

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+MIT License
+
+Copyright (c) 2017 Roger Light.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Makefile

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+.PHONY: all memtest clean install
+
+VERSION=0.1
+
+CC=gcc
+NAME=usb-reset
+CFLAGS=-Wall -ggdb -I/usr/include/libusb-1.0 -DVERSION="\"${VERSION}\""
+LDFLAGS=-lusb-1.0
+INSTALL=install
+prefix=/usr/local
+
+all : $(NAME)
+
+$(NAME).o : $(NAME).c
+	$(CC) -c $(CFLAGS) -o $@ $<
+
+$(NAME) : $(NAME).o
+	$(CC) -o $@ $^ ${LDFLAGS}
+
+memtest : $(NAME)
+	valgrind -v --show-reachable=yes --leak-check=full ./$^
+
+clean :
+	-rm -f $(NAME) *.o
+
+install : all
+	$(INSTALL) -d ${DESTDIR}$(prefix)/bin
+	$(INSTALL) $(NAME) $(DESTDIR)$(prefix)/bin

snapcraft.yaml

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+name: usb-reset
+version: '0.1'
+summary: Reset a USB device using vendor and product ID.
+description: This tool allows you to perform a bus reset on a USB device
+    connected to your system. If the device has got confused, this may sort it
+    out.
+confinement: strict
+
+apps:
+  usb-reset:
+    command: usr/local/bin/usb-reset
+    plugs: [raw-usb]
+
+parts:
+  usb-reset:
+    plugin: make
+    source: https://github.com/ralight/usb-reset
+    source-type: git
+
+    build-packages:
+      - libusb-1.0-0-dev
+
+    stage-packages:
+      - libusb-1.0-0
+
+    prime:
+    - usr/local/bin/usb-reset

usb-reset.c

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+/*
+MIT License
+
+Copyright (c) 2017 Roger Light <[email protected]>.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+#include <libusb.h>
+#include <stdio.h>
+#include <string.h>
+
+void print_usage(void)
+{
+	printf("usb-reset %s: perform a bus reset on a USB device.\n\n", VERSION);
+	printf("Usage: usb-reset vendor_id:product_id\n");
+	printf("Example: usb-reset 0245:7276\n\n");
+	printf("See https://github.com/ralight/usb-reset\n");
+}
+
+
+int hex_char_to_int(char c)
+{
+	if(c >= '0' && c <= '9'){
+		return c-'0';
+	}
+
+	switch(c){
+		case 'A':
+		case 'a':
+			return 10;
+
+		case 'B':
+		case 'b':
+			return 11;
+
+		case 'C':
+		case 'c':
+			return 12;
+
+		case 'D':
+		case 'd':
+			return 13;
+
+		case 'E':
+		case 'e':
+			return 14;
+
+		case 'F':
+		case 'f':
+			return 15;
+
+		default:
+			return -1;
+	}
+}
+
+
+int str_to_vid_pid(char *vid_pid, int *vid, int *pid)
+{
+	int i;
+	int val;
+
+	if(strlen(vid_pid) != 9){
+		printf("Invalid vendor ID/product ID length.\n");
+		return 1;
+	}
+
+	if(vid_pid[4] != ':'){
+		printf("Invalid vendor ID/product ID, no ':'.\n");
+		return 1;
+	}
+
+	*vid = 0;
+	for(i=0; i<4; i++){
+		val = hex_char_to_int(vid_pid[i]);
+		if(val == -1){
+			printf("Invalid character in vendor id '%c'.\n", vid_pid[i]);
+			return 1;
+		}
+
+		(*vid) = (*vid)*16 + val;
+	}
+
+	*pid = 0;
+	for(i=5; i<9; i++){
+		val = hex_char_to_int(vid_pid[i]);
+		if(val == -1){
+			printf("Invalid character in product id '%c'.\n", vid_pid[i]);
+			return 1;
+		}
+
+		(*pid) = (*pid)*16 + val;
+	}
+
+	return 0;
+}
+
+
+int main(int argc, char *argv[])
+{
+	int vid, pid;
+	struct libusb_device_handle *handle;
+	int rc = 0;
+
+	if(argc != 2){
+		print_usage();
+		return 1;
+	}
+
+	if(str_to_vid_pid(argv[1], &vid, &pid)){
+		return 1;
+	}
+
+	if(libusb_init(NULL)){
+		printf("Unable to initialise libusb, exiting.\n");
+		return 1;
+	}
+
+	handle = libusb_open_device_with_vid_pid(NULL, vid, pid);
+	if(!handle){
+		printf("Unable to open device %04x:%04x, are you root?\n", vid, pid);
+		libusb_exit(NULL);
+		return 1;
+	}
+
+	if(libusb_reset_device(handle)){
+		printf("Reset failed, you may need to replug your device.\n");
+		rc = 1;
+	}
+
+	libusb_close(handle);
+	libusb_exit(NULL);
+
+	return rc;
+}
+