[U-Boot] [PATCH v1 3/5] usb, g_dnl: make iSerialNumber board configurable

[Heiko Schocher <hs@denx.de>]

add the possibility to set the iSerialNumber board specific.
Therefore the CONFIG_G_DNL_SERIAL_STRING is introduced, which
defines the maximum length of the iSerialNumber string.
The new function g_dnl_set_serialnumber() must called from
g_dnl_bind_fixup(), to setup the iSerialNumber string.

Signed-off-by: Heiko Schocher <hs@denx.de>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Lukasz Majewski <l.majewski@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
---
 drivers/usb/gadget/g_dnl.c | 28 ++++++++++++++++++++++++++++
 include/g_dnl.h            |  3 +++
 2 files changed, 31 insertions(+)

diff --git a/drivers/usb/gadget/g_dnl.c b/drivers/usb/gadget/g_dnl.c
index 40868c0..5f09d66 100644
--- a/drivers/usb/gadget/g_dnl.c
+++ b/drivers/usb/gadget/g_dnl.c
@@ -39,8 +39,21 @@
 
 static const char shortname[] = "usb_dnl_";
 static const char product[] = "USB download gadget";
+#if defined(CONFIG_G_DNL_SERIAL_STRING)
+#define STRING_SERIAL  3
+static char g_dnl_serial[CONFIG_G_DNL_SERIAL_STRING + 1];
+#endif
 static const char manufacturer[] = CONFIG_G_DNL_MANUFACTURER;
 
+#if defined(CONFIG_G_DNL_SERIAL_STRING)
+void g_dnl_set_serialnumber(char *s)
+{
+	memset(g_dnl_serial, 0, CONFIG_G_DNL_SERIAL_STRING + 1);
+	if (strlen(s) <= CONFIG_G_DNL_SERIAL_STRING)
+		strncpy(g_dnl_serial, s, strlen(s));
+}
+#endif
+
 static struct usb_device_descriptor device_desc = {
 	.bLength = sizeof device_desc,
 	.bDescriptorType = USB_DT_DEVICE,
@@ -52,6 +65,9 @@ static struct usb_device_descriptor device_desc = {
 	.idVendor = __constant_cpu_to_le16(CONFIG_G_DNL_VENDOR_NUM),
 	.idProduct = __constant_cpu_to_le16(CONFIG_G_DNL_PRODUCT_NUM),
 	.iProduct = STRING_PRODUCT,
+#if defined(CONFIG_G_DNL_SERIAL_STRING)
+	.iSerialNumber = STRING_SERIAL,
+#endif
 	.bNumConfigurations = 1,
 };
 
@@ -62,6 +78,9 @@ static struct usb_device_descriptor device_desc = {
 static struct usb_string g_dnl_string_defs[] = {
 	{.s = manufacturer},
 	{.s = product},
+#if defined(CONFIG_G_DNL_SERIAL_STRING)
+	{.s = g_dnl_serial},
+#endif
 	{ }		/* end of list */
 };
 
@@ -145,6 +164,15 @@ static int g_dnl_bind(struct usb_composite_dev *cdev)
 	g_dnl_string_defs[1].id = id;
 	device_desc.iProduct = id;
 
+#if defined(CONFIG_G_DNL_SERIAL_STRING)
+	id = usb_string_id(cdev);
+	if (id < 0)
+		return id;
+
+	g_dnl_string_defs[2].id = id;
+	device_desc.iSerialNumber = id;
+#endif
+
 	g_dnl_bind_fixup(&device_desc);
 	ret = g_dnl_config_register(cdev);
 	if (ret)
diff --git a/include/g_dnl.h b/include/g_dnl.h
index 2b2f11a..a539a34 100644
--- a/include/g_dnl.h
+++ b/include/g_dnl.h
@@ -13,6 +13,9 @@
 int g_dnl_bind_fixup(struct usb_device_descriptor *);
 int g_dnl_register(const char *s);
 void g_dnl_unregister(void);
+#if defined(CONFIG_G_DNL_SERIAL_STRING)
+void g_dnl_set_serialnumber(char *);
+#endif
 
 /* USB initialization declaration - board specific */
 void board_usb_init(void);
-- 
1.8.3.1