From c4876320db4d3c7def993ac30d92215745a3435f Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Sun, 8 Nov 2015 23:47:53 -0700
Subject: sandbox: usb: Allow dynamic emulated USB device descriptors

We would like the serial number to come from the device tree node name of
the emulated device. This avoids them all having the same name. Adjust the
code to support this.

Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/usb/emul/sandbox_flash.c b/drivers/usb/emul/sandbox_flash.c
index 6e0808d..0965ad0 100644
--- a/drivers/usb/emul/sandbox_flash.c
+++ b/drivers/usb/emul/sandbox_flash.c
@@ -31,6 +31,14 @@ enum cmd_phase {
 	PHASE_STATUS,
 };
 
+enum {
+	STRINGID_MANUFACTURER = 1,
+	STRINGID_PRODUCT,
+	STRINGID_SERIAL,
+
+	STRINGID_COUNT,
+};
+
 /**
  * struct sandbox_flash_priv - private state for this driver
  *
@@ -61,6 +69,7 @@ struct sandbox_flash_priv {
 
 struct sandbox_flash_plat {
 	const char *pathname;
+	struct usb_string flash_strings[STRINGID_COUNT];
 };
 
 struct scsi_inquiry_resp {
@@ -89,21 +98,6 @@ struct __packed scsi_read10_req {
 	u8 spare2[3];
 };
 
-enum {
-	STRINGID_MANUFACTURER = 1,
-	STRINGID_PRODUCT,
-	STRINGID_SERIAL,
-
-	STRINGID_COUNT,
-};
-
-static struct usb_string flash_strings[] = {
-	{STRINGID_MANUFACTURER,	"sandbox"},
-	{STRINGID_PRODUCT,	"flash"},
-	{STRINGID_SERIAL,	"2345"},
-	{},
-};
-
 static struct usb_device_descriptor flash_device_desc = {
 	.bLength =		sizeof(flash_device_desc),
 	.bDescriptorType =	USB_DT_DEVICE,
@@ -246,7 +240,8 @@ static void handle_read(struct sandbox_flash_priv *priv, ulong lba,
 	}
 }
 
-static int handle_ufi_command(struct sandbox_flash_priv *priv, const void *buff,
+static int handle_ufi_command(struct sandbox_flash_plat *plat,
+			      struct sandbox_flash_priv *priv, const void *buff,
 			      int len)
 {
 	const struct SCSI_cmd_block *req = buff;
@@ -260,9 +255,10 @@ static int handle_ufi_command(struct sandbox_flash_priv *priv, const void *buff,
 		resp->data_format = 1;
 		resp->additional_len = 0x1f;
 		strncpy(resp->vendor,
-			flash_strings[STRINGID_MANUFACTURER -  1].s,
+			plat->flash_strings[STRINGID_MANUFACTURER -  1].s,
 			sizeof(resp->vendor));
-		strncpy(resp->product, flash_strings[STRINGID_PRODUCT - 1].s,
+		strncpy(resp->product,
+			plat->flash_strings[STRINGID_PRODUCT - 1].s,
 			sizeof(resp->product));
 		strncpy(resp->revision, "1.0", sizeof(resp->revision));
 		setup_response(priv, resp, sizeof(*resp));
@@ -303,6 +299,7 @@ static int handle_ufi_command(struct sandbox_flash_priv *priv, const void *buff,
 static int sandbox_flash_bulk(struct udevice *dev, struct usb_device *udev,
 			      unsigned long pipe, void *buff, int len)
 {
+	struct sandbox_flash_plat *plat = dev_get_platdata(dev);
 	struct sandbox_flash_priv *priv = dev_get_priv(dev);
 	int ep = usb_pipeendpoint(pipe);
 	struct umass_bbb_cbw *cbw = buff;
@@ -325,7 +322,7 @@ static int sandbox_flash_bulk(struct udevice *dev, struct usb_device *udev,
 				goto err;
 			priv->transfer_len = cbw->dCBWDataTransferLength;
 			priv->tag = cbw->dCBWTag;
-			return handle_ufi_command(priv, cbw->CBWCDB,
+			return handle_ufi_command(plat, priv, cbw->CBWCDB,
 						  cbw->bCDBLength);
 		case PHASE_DATA:
 			debug("data out\n");
@@ -384,7 +381,18 @@ static int sandbox_flash_ofdata_to_platdata(struct udevice *dev)
 
 static int sandbox_flash_bind(struct udevice *dev)
 {
-	return usb_emul_setup_device(dev, PACKET_SIZE_64, flash_strings,
+	struct sandbox_flash_plat *plat = dev_get_platdata(dev);
+	struct usb_string *fs;
+
+	fs = plat->flash_strings;
+	fs[0].id = STRINGID_MANUFACTURER;
+	fs[0].s = "sandbox";
+	fs[1].id = STRINGID_PRODUCT;
+	fs[1].s = "flash";
+	fs[2].id = STRINGID_SERIAL;
+	fs[2].s = dev->name;
+
+	return usb_emul_setup_device(dev, PACKET_SIZE_64, plat->flash_strings,
 				     flash_desc_list);
 }
 
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