mirror of
https://github.com/brain-hackers/u-boot-brain
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![Simon Glass](/assets/img/avatar_default.png)
With sandbox we want to be able to emulate USB devices so that we can test the USB stack. Add a uclass to support this. It implements the same operations as a normal USB device driver, but in this case passes them on to an emulation driver. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Marek Vasut <marex@denx.de>
264 lines
6.2 KiB
C
264 lines
6.2 KiB
C
/*
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* (C) Copyright 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <dm.h>
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#include <usb.h>
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#include <dm/root.h>
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#include <dm/device-internal.h>
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DECLARE_GLOBAL_DATA_PTR;
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static int copy_to_unicode(char *buff, int length, const char *str)
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{
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int ptr;
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int i;
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if (length < 2)
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return 0;
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buff[1] = USB_DT_STRING;
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for (ptr = 2, i = 0; ptr + 1 < length && *str; i++, ptr += 2) {
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buff[ptr] = str[i];
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buff[ptr + 1] = 0;
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}
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buff[0] = ptr;
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return ptr;
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}
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static int usb_emul_get_string(struct usb_string *strings, int index,
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char *buff, int length)
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{
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if (index == 0) {
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char *desc = buff;
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desc[0] = 4;
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desc[1] = USB_DT_STRING;
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desc[2] = 0x09;
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desc[3] = 0x14;
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return 4;
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} else if (strings) {
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struct usb_string *ptr;
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for (ptr = strings; ptr->s; ptr++) {
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if (ptr->id == index)
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return copy_to_unicode(buff, length, ptr->s);
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}
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}
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return -EINVAL;
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}
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static struct usb_generic_descriptor **find_descriptor(
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struct usb_generic_descriptor **ptr, int type, int index)
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{
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debug("%s: type=%x, index=%d\n", __func__, type, index);
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for (; *ptr; ptr++) {
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if ((*ptr)->bDescriptorType != type)
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continue;
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switch (type) {
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case USB_DT_CONFIG: {
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struct usb_config_descriptor *cdesc;
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cdesc = (struct usb_config_descriptor *)*ptr;
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if (cdesc && cdesc->bConfigurationValue == index)
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return ptr;
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break;
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}
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default:
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return ptr;
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}
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}
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debug("%s: config ptr=%p\n", __func__, *ptr);
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return ptr;
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}
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static int usb_emul_get_descriptor(struct usb_dev_platdata *plat, int value,
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void *buffer, int length)
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{
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struct usb_generic_descriptor **ptr;
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int type = value >> 8;
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int index = value & 0xff;
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int upto, todo;
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debug("%s: type=%d, index=%d, plat=%p\n", __func__, type, index, plat);
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if (type == USB_DT_STRING) {
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return usb_emul_get_string(plat->strings, index, buffer,
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length);
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}
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ptr = find_descriptor((struct usb_generic_descriptor **)plat->desc_list,
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type, index);
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if (!ptr) {
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debug("%s: Could not find descriptor type %d, index %d\n",
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__func__, type, index);
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return -ENOENT;
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}
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for (upto = 0; *ptr && upto < length; ptr++, upto += todo) {
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todo = min(length - upto, (int)(*ptr)->bLength);
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memcpy(buffer + upto, *ptr, todo);
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}
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return upto ? upto : length ? -EIO : 0;
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}
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int usb_emul_find(struct udevice *bus, ulong pipe, struct udevice **emulp)
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{
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int devnum = usb_pipedevice(pipe);
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struct udevice *dev;
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struct uclass *uc;
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int ret;
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*emulp = NULL;
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ret = uclass_get(UCLASS_USB_EMUL, &uc);
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if (ret)
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return ret;
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uclass_foreach_dev(dev, uc) {
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struct usb_dev_platdata *udev = dev_get_parent_platdata(dev);
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if (udev->devnum == devnum) {
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debug("%s: Found emulator '%s', addr %d\n", __func__,
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dev->name, udev->devnum);
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*emulp = dev;
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return 0;
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}
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}
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debug("%s: No emulator found, addr %d\n", __func__, devnum);
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return -ENOENT;
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}
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int usb_emul_control(struct udevice *emul, struct usb_device *udev,
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unsigned long pipe, void *buffer, int length,
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struct devrequest *setup)
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{
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struct dm_usb_ops *ops = usb_get_emul_ops(emul);
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struct usb_dev_platdata *plat;
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int ret;
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/* We permit getting the descriptor before we are probed */
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plat = dev_get_parent_platdata(emul);
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if (!ops->control)
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return -ENOSYS;
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debug("%s: dev=%s\n", __func__, emul->name);
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if (pipe == usb_rcvctrlpipe(udev, 0)) {
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switch (setup->request) {
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case USB_REQ_GET_DESCRIPTOR: {
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return usb_emul_get_descriptor(plat, setup->value,
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buffer, length);
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}
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default:
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ret = device_probe(emul);
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if (ret)
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return ret;
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return ops->control(emul, udev, pipe, buffer, length,
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setup);
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}
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} else if (pipe == usb_snddefctrl(udev)) {
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switch (setup->request) {
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case USB_REQ_SET_ADDRESS:
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debug(" ** set address %s %d\n", emul->name,
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setup->value);
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plat->devnum = setup->value;
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return 0;
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default:
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debug("requestsend =%x\n", setup->request);
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break;
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}
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} else if (pipe == usb_sndctrlpipe(udev, 0)) {
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switch (setup->request) {
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case USB_REQ_SET_CONFIGURATION:
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plat->configno = setup->value;
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return 0;
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default:
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ret = device_probe(emul);
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if (ret)
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return ret;
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return ops->control(emul, udev, pipe, buffer, length,
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setup);
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}
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}
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debug("pipe=%lx\n", pipe);
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return -EIO;
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}
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int usb_emul_bulk(struct udevice *emul, struct usb_device *udev,
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unsigned long pipe, void *buffer, int length)
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{
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struct dm_usb_ops *ops = usb_get_emul_ops(emul);
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int ret;
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/* We permit getting the descriptor before we are probed */
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if (!ops->bulk)
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return -ENOSYS;
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debug("%s: dev=%s\n", __func__, emul->name);
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ret = device_probe(emul);
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if (ret)
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return ret;
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return ops->bulk(emul, udev, pipe, buffer, length);
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}
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int usb_emul_setup_device(struct udevice *dev, int maxpacketsize,
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struct usb_string *strings, void **desc_list)
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{
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struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
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struct usb_generic_descriptor **ptr;
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struct usb_config_descriptor *cdesc;
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int upto;
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plat->strings = strings;
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plat->desc_list = (struct usb_generic_descriptor **)desc_list;
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/* Fill in wTotalLength for each configuration descriptor */
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ptr = plat->desc_list;
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for (cdesc = NULL, upto = 0; *ptr; upto += (*ptr)->bLength, ptr++) {
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debug(" - upto=%d, type=%d\n", upto, (*ptr)->bDescriptorType);
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if ((*ptr)->bDescriptorType == USB_DT_CONFIG) {
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if (cdesc) {
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cdesc->wTotalLength = upto;
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debug("%s: config %d length %d\n", __func__,
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cdesc->bConfigurationValue,
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cdesc->bLength);
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}
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cdesc = (struct usb_config_descriptor *)*ptr;
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upto = 0;
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}
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}
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if (cdesc) {
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cdesc->wTotalLength = upto;
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debug("%s: config %d length %d\n", __func__,
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cdesc->bConfigurationValue, cdesc->wTotalLength);
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}
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return 0;
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}
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int usb_emul_post_bind(struct udevice *dev)
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{
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/* Scan the bus for devices */
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return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
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}
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void usb_emul_reset(struct udevice *dev)
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{
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struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
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plat->devnum = 0;
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plat->configno = 0;
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}
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UCLASS_DRIVER(usb_emul) = {
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.id = UCLASS_USB_EMUL,
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.name = "usb_emul",
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.post_bind = usb_emul_post_bind,
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.per_child_auto_alloc_size = sizeof(struct usb_device),
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.per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
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};
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