usb: gadget: push iManufacturer into gadgets

This patch pushes the iManufacturer module argument from composite into
each gadget. Once the user uses the module paramter, the string is
overwritten with the final value.
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/composite.c

@@ -32,10 +32,6 @@
  * published in the device descriptor, either numbers or strings or both.
  * String parameters are in UTF-8 (superset of ASCII's 7 bit characters).
  */
-static char *iManufacturer;
-module_param(iManufacturer, charp, S_IRUGO);
-MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string");
-
 static char *iProduct;
 module_param(iProduct, charp, S_IRUGO);
 MODULE_PARM_DESC(iProduct, "USB Product string");
@@ -916,8 +912,7 @@ static int get_string(struct usb_composite_dev *cdev,
 	 * check if the string has not been overridden.
 	 */
 	if (cdev->manufacturer_override == id)
-		str = iManufacturer ?: composite->iManufacturer ?:
-			composite_manufacturer;
+		str = composite->iManufacturer ?: composite_manufacturer;
 	else if (cdev->product_override == id)
 		str = iProduct ?: composite->iProduct;
 	else if (cdev->serial_override == id)
@@ -1408,6 +1403,7 @@ static void update_unchanged_dev_desc(struct usb_device_descriptor *new,
 	__le16 idProduct;
 	__le16 bcdDevice;
 	u8 iSerialNumber;
+	u8 iManufacturer;
 
 	/*
 	 * these variables may have been set in
@@ -1417,6 +1413,7 @@ static void update_unchanged_dev_desc(struct usb_device_descriptor *new,
 	idProduct = new->idProduct;
 	bcdDevice = new->bcdDevice;
 	iSerialNumber = new->iSerialNumber;
+	iManufacturer = new->iManufacturer;
 
 	*new = *old;
 	if (idVendor)
@@ -1427,6 +1424,8 @@ static void update_unchanged_dev_desc(struct usb_device_descriptor *new,
 		new->bcdDevice = bcdDevice;
 	if (iSerialNumber)
 		new->iSerialNumber = iSerialNumber;
+	if (iManufacturer)
+		new->iManufacturer = iManufacturer;
 }
 
 static struct usb_composite_driver *to_cdriver(struct usb_gadget_driver *gdrv)
@@ -1487,9 +1486,8 @@ static int composite_bind(struct usb_gadget *gadget,
 	update_unchanged_dev_desc(&cdev->desc, composite->dev);
 
 	/* string overrides */
-	if (iManufacturer || !cdev->desc.iManufacturer) {
-		if (!iManufacturer && !composite->iManufacturer &&
-		    !*composite_manufacturer)
+	if (!cdev->desc.iManufacturer) {
+		if (!composite->iManufacturer)
 			snprintf(composite_manufacturer,
 				 sizeof composite_manufacturer,
 				 "%s %s with %s",
@@ -1706,4 +1704,8 @@ void usb_composite_overwrite_options(struct usb_composite_dev *cdev,
 		desc->iSerialNumber = dev_str[USB_GADGET_SERIAL_IDX].id;
 		dev_str[USB_GADGET_SERIAL_IDX].s = covr->serial_number;
 	}
+	if (covr->manufacturer) {
+		desc->iManufacturer = dev_str[USB_GADGET_MANUFACTURER_IDX].id;
+		dev_str[USB_GADGET_MANUFACTURER_IDX].s = covr->manufacturer;
+	}
 }

include/linux/usb/composite.h

@@ -401,6 +401,7 @@ struct usb_composite_overwrite {
 	u16	idProduct;
 	u16	bcdDevice;
 	char	*serial_number;
+	char	*manufacturer;
 };
 #define USB_GADGET_COMPOSITE_OPTIONS()					\
 	static struct usb_composite_overwrite coverwrite;		\
@@ -416,7 +417,11 @@ struct usb_composite_overwrite {
 									\
 	module_param_named(iSerialNumber, coverwrite.serial_number, charp, \
 			S_IRUGO); \
-	MODULE_PARM_DESC(iSerialNumber, "SerialNumber string")
+	MODULE_PARM_DESC(iSerialNumber, "SerialNumber string");		\
+									\
+	module_param_named(iManufacturer, coverwrite.manufacturer, charp, \
+			S_IRUGO); \
+	MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string")
 
 void usb_composite_overwrite_options(struct usb_composite_dev *cdev,
 		struct usb_composite_overwrite *covr);