usb_gadget: Retrieve device serial numbersubmit/tizen/20180516.042321accepted/tizen/unified/20180516.065547

The serial number is retrieved from /proc/cpuinfo and used as USB serial
number string.

Change-Id: Ibac051862011f697d7a63e8efeb5f50d0ea16c29
Signed-off-by: Paweł Szewczyk <p.szewczyk@samsung.com>

1 files changed, 45 insertions, 1 deletions

diff --git a/hw/usb_gadget/usb_gadget.c b/hw/usb_gadget/usb_gadget.c
index 00bd9a1..c412b8e 100755
--- a/hw/usb_gadget/usb_gadget.c
+++ b/hw/usb_gadget/usb_gadget.c
@@ -20,6 +20,7 @@
 
 #include <hw/usb_gadget.h>
 
+#include <stdio.h>
 #include <stdlib.h>
 #include <errno.h>
 #include <string.h>
@@ -122,11 +123,52 @@ out:
 	return -ENOMEM;
 }
 
+#define CPUINFO_DIR "/proc/cpuinfo"
+#define SERIAL_TAG "Serial"
+#define LINE_LEN 64
+
+static int get_device_serial(char **out)
+{
+	FILE *fp;
+	char line[LINE_LEN], *p, *q;
+
+	fp = fopen(CPUINFO_DIR, "r");
+	if (!fp)
+		return -1;
+
+	while ((p = fgets(line, LINE_LEN, fp)) != NULL) {
+		p = strchr(p, '\t');
+		if (!p)
+			continue;
+
+		*p = '\0';
+
+		if (strncmp(line, SERIAL_TAG, LINE_LEN) != 0)
+			continue;
+
+		++p;
+		p = strchr(p, ':');
+		if (!p)
+			continue;
+		p += 2;
+
+		q = strchrnul(p, '\n');
+		*q = '\0';
+		*out = strdup(p);
+		fclose(fp);
+		return 0;
+	}
+
+	fclose(fp);
+	return -1;
+}
+
 static int alloc_default_gadget(struct usb_gadget **_gadget)
 {
 	struct usb_gadget *gadget;
 	struct usb_gadget_strings *strs;
 	struct usb_configuration **configs;
+	int ret;
 
 	gadget = zalloc(sizeof(*gadget));
 	if (!gadget)
@@ -143,7 +185,9 @@ static int alloc_default_gadget(struct usb_gadget **_gadget)
 	strs[0].lang_code = 0x409;
 	strs[0].manufacturer = strdup(DEFAULT_MANUFACTURER);
 	strs[0].product = strdup(DEFAULT_PRODUCT);
-	strs[0].serial = strdup(DEFAULT_SERIAL);
+	ret = get_device_serial(&strs[0].serial);
+	if (ret < 0)
+		strs[0].serial = strdup(DEFAULT_SERIAL);
 
 	if (!strs[0].manufacturer || !strs[0].product || !strs[0].serial)
 		goto free_strs;