ppps: add support for separate USB-3 PPPS path

Some devices / hubs require switching both USB-2 and USB-3 ports to
function correctly. Add ppps3_path device option to control USB-3 port
in addition to the USB-2 port.

Signed-off-by: Dmitry Baryshkov <[email protected]>

device.h

@@ -36,6 +36,7 @@ struct device {
 	char *serial;
 	char *description;
 	char *ppps_path;
+	char *ppps3_path;
 	struct list_head *users;
 	unsigned voltage;
 	bool tickle_mmc;

device_parser.c

@@ -189,6 +189,8 @@ static void parse_board(struct device_parser *dp)
 			dev->usb_always_on = !strcmp(value, "true");
 		} else if (!strcmp(key, "ppps_path")) {
 			dev->ppps_path = strdup(value);
+		} else if (!strcmp(key, "ppps3_path")) {
+			dev->ppps3_path = strdup(value);
 		} else {
 			fprintf(stderr, "device parser: unknown key \"%s\"\n", key);
 			exit(1);

ppps.c

@@ -45,33 +45,49 @@
 
 #include "device.h"
 
-#define PPPS_BASE_PATH "/sys/bus/usb/devices"
-#define PPPS_BASE_PATH_LEN strlen(PPPS_BASE_PATH)
+#define PPPS_BASE_PATH "/sys/bus/usb/devices/%s/disable"
 
-void ppps_power(struct device *dev, bool on)
+void ppps_power_path(const char *ppps_path, bool on)
 {
-	static char *path = NULL;
 	int rc, fd;
 
-	/* Only need to figure out the whole string once */
-	if (!path) {
-		/* ppps_path should be like "2-2:1.0/2-2-port2" */
-		asprintf(&path, "%s/%s/disable", PPPS_BASE_PATH, dev->ppps_path);
-	}
-
-	// fprintf(stderr, "ppps_power: %-3s %s\n", on ? "on" : "off", path);
+	//fprintf(stderr, "ppps_power: %-3s %s\n", on ? "on" : "off", path);
 
-	fd = open(path, O_WRONLY);
+	fd = open(ppps_path, O_WRONLY);
 	if (fd < 0) {
-		fprintf(stderr, "failed to open %s: %s\n", path, strerror(errno));
+		fprintf(stderr, "failed to open %s: %s\n", ppps_path, strerror(errno));
 		if (errno != ENOENT)
 			fprintf(stderr, "Maybe missing permissions (see https://git.io/JIB2Z)\n");
 		return;
 	}
 
 	rc = write(fd, on ? "0" : "1", 1);
 	if (rc < 0)
-		fprintf(stderr, "failed to write to %s: %s\n", path, strerror(errno));
+		fprintf(stderr, "failed to write to %s: %s\n", ppps_path, strerror(errno));
 
 	close(fd);
 }
+
+void ppps_power(struct device *dev, bool on)
+{
+	/* ppps_path should be like "2-2:1.0/2-2-port2" */
+	if (dev->ppps_path[0] != '/') {
+		char *temp;
+
+		asprintf(&temp, PPPS_BASE_PATH, dev->ppps_path);
+		free(dev->ppps_path);
+		dev->ppps_path = temp;
+	}
+
+	if (dev->ppps3_path[0] != '/') {
+		char *temp;
+
+		asprintf(&temp, PPPS_BASE_PATH, dev->ppps3_path);
+		free(dev->ppps3_path);
+		dev->ppps3_path = temp;
+	}
+
+	ppps_power_path(dev->ppps_path, on);
+	if (dev->ppps3_path)
+		ppps_power_path(dev->ppps3_path, on);
+}