Added --i2c command line option

evga-icx.c

@@ -24,7 +24,8 @@ char *header_start = "";
 char *header_end = "";
 
 static const char helpstring[] = "Available options:\n"
-                                 "--gpu N      : Control only GPU N instead of all supported cards\n"
+								 "--i2c N      : Only probe I2C bus N instead of all (may help with stuttering with --watch)\n"
+								 "--gpu N      : Control only GPU N instead of all supported cards\n"
 								 "--fan SPEED  : Set all fans at once to SPEED (see below)\n"
 								 "--fanN SPEED : Set fan N (0-3) to SPEED\n"
 								 "    SPEED may be one of the following:\n"
@@ -47,13 +48,22 @@ int main (int argc, char **argv)
 	int print_info = 0;
 	int compact = 0;
 	int gpu_num = -1;    /* Card to control */
+	int i2c_bus = -1;
 	int overwrite = 0;
 	unsigned int watch = 0;
 	char *fan_speed[ICX3_MAX_FANS] = {NULL}; 
 	
 	/* Input parsing */
 	for (int i = 1; i < argc; i++){
-		if (strcmp(argv[i], "--gpu") == 0) {
+		if (strcmp(argv[i], "--i2c") == 0) {
+			i++;
+			if (i < argc) {
+				i2c_bus = atoi(argv[i]);
+			} else {
+				printf(helpstring);
+				return -1;
+			}
+		} else if (strcmp(argv[i], "--gpu") == 0) {
 			i++;
 			if (i < argc) {
 				gpu_num = atoi(argv[i]);
@@ -119,7 +129,7 @@ int main (int argc, char **argv)
 	if (overwrite && !compact)
 		overwrite = 0;
 	
-	gpu_count = find_evga_gpu_i2cs(gpus, MAX_GPUS);
+	gpu_count = find_evga_gpu_i2cs(gpus, MAX_GPUS, i2c_bus);
 
 	if (gpu_count == -1) {
 		printf("Error scanning I2C devices\n");