dm: usb: sandbox: Add a driver for sandbox

This driver supports using emulation devices to provide a USB bus within
sandbox.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Marek Vasut <marex@denx.de>

drivers/usb/host/Makefile

@@ -7,6 +7,7 @@
 
 ifdef CONFIG_DM_USB
 obj-$(CONFIG_CMD_USB) += usb-uclass.o
+obj-$(CONFIG_SANDBOX) += usb-sandbox.o
 endif
 
 # ohci

drivers/usb/host/usb-sandbox.c

@@ -0,0 +1,117 @@
+/*
+ * (C) Copyright 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <usb.h>
+#include <dm/root.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static void usbmon_trace(struct udevice *bus, ulong pipe,
+			 struct devrequest *setup, struct udevice *emul)
+{
+	static const char types[] = "ZICB";
+	int type;
+
+	type = (pipe & USB_PIPE_TYPE_MASK) >> USB_PIPE_TYPE_SHIFT;
+	debug("0 0 S %c%c:%d:%03ld:%ld", types[type],
+	      pipe & USB_DIR_IN ? 'i' : 'o',
+	      bus->seq,
+	      (pipe & USB_PIPE_DEV_MASK) >> USB_PIPE_DEV_SHIFT,
+	      (pipe & USB_PIPE_EP_MASK) >> USB_PIPE_EP_SHIFT);
+	if (setup) {
+		debug(" s %02x %02x %04x %04x %04x", setup->requesttype,
+		      setup->request, setup->value, setup->index,
+		      setup->length);
+	}
+	debug(" %s", emul ? emul->name : "(no emul found)");
+
+	debug("\n");
+}
+
+static int sandbox_submit_control(struct udevice *bus,
+				      struct usb_device *udev,
+				      unsigned long pipe,
+				      void *buffer, int length,
+				      struct devrequest *setup)
+{
+	struct udevice *emul;
+	int ret;
+
+	/* Just use child of dev as emulator? */
+	debug("%s: bus=%s\n", __func__, bus->name);
+	ret = usb_emul_find(bus, pipe, &emul);
+	usbmon_trace(bus, pipe, setup, emul);
+	if (ret)
+		return ret;
+	ret = usb_emul_control(emul, udev, pipe, buffer, length, setup);
+	if (ret < 0) {
+		debug("ret=%d\n", ret);
+		udev->status = ret;
+		udev->act_len = 0;
+	} else {
+		udev->status = 0;
+		udev->act_len = ret;
+	}
+
+	return ret;
+}
+
+static int sandbox_submit_bulk(struct udevice *bus, struct usb_device *udev,
+			       unsigned long pipe, void *buffer, int length)
+{
+	struct udevice *emul;
+	int ret;
+
+	/* Just use child of dev as emulator? */
+	debug("%s: bus=%s\n", __func__, bus->name);
+	ret = usb_emul_find(bus, pipe, &emul);
+	usbmon_trace(bus, pipe, NULL, emul);
+	if (ret)
+		return ret;
+	ret = usb_emul_bulk(emul, udev, pipe, buffer, length);
+	if (ret < 0) {
+		debug("ret=%d\n", ret);
+		udev->status = ret;
+		udev->act_len = 0;
+	} else {
+		udev->status = 0;
+		udev->act_len = ret;
+	}
+
+	return ret;
+}
+
+static int sandbox_alloc_device(struct udevice *dev, struct usb_device *udev)
+{
+	return 0;
+}
+
+static int sandbox_usb_probe(struct udevice *dev)
+{
+	return 0;
+}
+
+static const struct dm_usb_ops sandbox_usb_ops = {
+	.control	= sandbox_submit_control,
+	.bulk		= sandbox_submit_bulk,
+	.alloc_device	= sandbox_alloc_device,
+};
+
+static const struct udevice_id sandbox_usb_ids[] = {
+	{ .compatible = "sandbox,usb" },
+	{ }
+};
+
+U_BOOT_DRIVER(usb_sandbox) = {
+	.name	= "usb_sandbox",
+	.id	= UCLASS_USB,
+	.of_match = sandbox_usb_ids,
+	.probe = sandbox_usb_probe,
+	.ops	= &sandbox_usb_ops,
+};