--- /dev/null
+/*
+ * (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 <os.h>
+#include <scsi.h>
+#include <usb.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * This driver emulates a USB keyboard using the USB HID specification (boot
+ * protocol)
+ */
+
+enum {
+ SANDBOX_KEYB_EP_IN = 1, /* endpoints */
+};
+
+enum cmd_phase {
+ PHASE_START,
+ PHASE_DATA,
+ PHASE_STATUS,
+};
+
+enum {
+ STRINGID_MANUFACTURER = 1,
+ STRINGID_PRODUCT,
+ STRINGID_SERIAL,
+
+ STRINGID_COUNT,
+};
+
+/**
+ * struct sandbox_keyb_priv - private state for this driver
+ *
+ */
+struct sandbox_keyb_priv {
+ struct membuff in;
+};
+
+struct sandbox_keyb_plat {
+ struct usb_string keyb_strings[STRINGID_COUNT];
+};
+
+static struct usb_device_descriptor keyb_device_desc = {
+ .bLength = sizeof(keyb_device_desc),
+ .bDescriptorType = USB_DT_DEVICE,
+
+ .bcdUSB = __constant_cpu_to_le16(0x0100),
+
+ .bDeviceClass = 0,
+ .bDeviceSubClass = 0,
+ .bDeviceProtocol = 0,
+
+ .idVendor = __constant_cpu_to_le16(0x1234),
+ .idProduct = __constant_cpu_to_le16(0x5679),
+ .iManufacturer = STRINGID_MANUFACTURER,
+ .iProduct = STRINGID_PRODUCT,
+ .iSerialNumber = STRINGID_SERIAL,
+ .bNumConfigurations = 1,
+};
+
+static struct usb_config_descriptor keyb_config0 = {
+ .bLength = sizeof(keyb_config0),
+ .bDescriptorType = USB_DT_CONFIG,
+
+ /* wTotalLength is set up by usb-emul-uclass */
+ .bNumInterfaces = 2,
+ .bConfigurationValue = 0,
+ .iConfiguration = 0,
+ .bmAttributes = 1 << 7 | 1 << 5,
+ .bMaxPower = 50,
+};
+
+static struct usb_interface_descriptor keyb_interface0 = {
+ .bLength = sizeof(keyb_interface0),
+ .bDescriptorType = USB_DT_INTERFACE,
+
+ .bInterfaceNumber = 0,
+ .bAlternateSetting = 0,
+ .bNumEndpoints = 1,
+ .bInterfaceClass = USB_CLASS_HID,
+ .bInterfaceSubClass = USB_SUB_HID_BOOT,
+ .bInterfaceProtocol = USB_PROT_HID_KEYBOARD,
+ .iInterface = 0,
+};
+
+static struct usb_class_hid_descriptor keyb_report0 = {
+ .bLength = sizeof(keyb_report0),
+ .bDescriptorType = USB_DT_HID,
+ .bcdCDC = 0x101,
+ .bCountryCode = 0,
+ .bNumDescriptors = 1,
+ .bDescriptorType0 = USB_DT_HID_REPORT,
+ .wDescriptorLength0 = 0x3f,
+};
+
+static struct usb_endpoint_descriptor keyb_endpoint0_in = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bEndpointAddress = SANDBOX_KEYB_EP_IN | USB_ENDPOINT_DIR_MASK,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK |
+ USB_ENDPOINT_XFER_ISOC,
+ .wMaxPacketSize = __constant_cpu_to_le16(8),
+ .bInterval = 0xa,
+};
+
+static struct usb_interface_descriptor keyb_interface1 = {
+ .bLength = sizeof(keyb_interface1),
+ .bDescriptorType = USB_DT_INTERFACE,
+
+ .bInterfaceNumber = 1,
+ .bAlternateSetting = 0,
+ .bNumEndpoints = 1,
+ .bInterfaceClass = USB_CLASS_HID,
+ .bInterfaceSubClass = USB_SUB_HID_BOOT,
+ .bInterfaceProtocol = USB_PROT_HID_MOUSE,
+ .iInterface = 0,
+};
+
+static struct usb_class_hid_descriptor keyb_report1 = {
+ .bLength = sizeof(struct usb_class_hid_descriptor),
+ .bDescriptorType = USB_DT_HID,
+ .bcdCDC = 0x101,
+ .bCountryCode = 0,
+ .bNumDescriptors = 1,
+ .bDescriptorType0 = USB_DT_HID_REPORT,
+ .wDescriptorLength0 = 0x32,
+};
+
+static struct usb_endpoint_descriptor keyb_endpoint1_in = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bEndpointAddress = SANDBOX_KEYB_EP_IN | USB_ENDPOINT_DIR_MASK,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK |
+ USB_ENDPOINT_XFER_ISOC,
+ .wMaxPacketSize = __constant_cpu_to_le16(8),
+ .bInterval = 0xa,
+};
+
+static void *keyb_desc_list[] = {
+ &keyb_device_desc,
+ &keyb_config0,
+ &keyb_interface0,
+ &keyb_report0,
+ &keyb_endpoint0_in,
+ &keyb_interface1,
+ &keyb_report1,
+ &keyb_endpoint1_in,
+ NULL,
+};
+
+int sandbox_usb_keyb_add_string(struct udevice *dev, const char *str)
+{
+ struct sandbox_keyb_priv *priv = dev_get_priv(dev);
+ int len, ret;
+
+ len = strlen(str);
+ ret = membuff_put(&priv->in, str, len);
+ if (ret != len)
+ return -ENOSPC;
+
+ return 0;
+}
+
+static int sandbox_keyb_control(struct udevice *dev, struct usb_device *udev,
+ unsigned long pipe, void *buff, int len,
+ struct devrequest *setup)
+{
+ debug("pipe=%lx\n", pipe);
+
+ return -EIO;
+}
+
+static int sandbox_keyb_interrupt(struct udevice *dev, struct usb_device *udev,
+ unsigned long pipe, void *buffer, int length, int interval)
+{
+ struct sandbox_keyb_priv *priv = dev_get_priv(dev);
+ uint8_t *data = buffer;
+ int ch;
+
+ memset(data, '\0', length);
+ ch = membuff_getbyte(&priv->in);
+ if (ch != -1)
+ data[2] = 4 + ch - 'a';
+
+ return 0;
+}
+
+static int sandbox_keyb_bind(struct udevice *dev)
+{
+ struct sandbox_keyb_plat *plat = dev_get_platdata(dev);
+ struct usb_string *fs;
+
+ fs = plat->keyb_strings;
+ fs[0].id = STRINGID_MANUFACTURER;
+ fs[0].s = "sandbox";
+ fs[1].id = STRINGID_PRODUCT;
+ fs[1].s = "keyboard";
+ fs[2].id = STRINGID_SERIAL;
+ fs[2].s = dev->name;
+
+ return usb_emul_setup_device(dev, PACKET_SIZE_8, plat->keyb_strings,
+ keyb_desc_list);
+}
+
+static int sandbox_keyb_probe(struct udevice *dev)
+{
+ struct sandbox_keyb_priv *priv = dev_get_priv(dev);
+
+ return membuff_new(&priv->in, 256);
+}
+
+static const struct dm_usb_ops sandbox_usb_keyb_ops = {
+ .control = sandbox_keyb_control,
+ .interrupt = sandbox_keyb_interrupt,
+};
+
+static const struct udevice_id sandbox_usb_keyb_ids[] = {
+ { .compatible = "sandbox,usb-keyb" },
+ { }
+};
+
+U_BOOT_DRIVER(usb_sandbox_keyb) = {
+ .name = "usb_sandbox_keyb",
+ .id = UCLASS_USB_EMUL,
+ .of_match = sandbox_usb_keyb_ids,
+ .bind = sandbox_keyb_bind,
+ .probe = sandbox_keyb_probe,
+ .ops = &sandbox_usb_keyb_ops,
+ .priv_auto_alloc_size = sizeof(struct sandbox_keyb_priv),
+ .platdata_auto_alloc_size = sizeof(struct sandbox_keyb_plat),
+};
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