Archipelago » qemu

#include "usb.h"

#include "usb-desc.h"

#include "trace.h"

/* ------------------------------------------------------------------ */

static uint8_t usb_lo(uint16_t val)

{

    return val & 0xff;

}

static uint8_t usb_hi(uint16_t val)

{

    return (val >> 8) & 0xff;

}

int usb_desc_device(const USBDescID *id, const USBDescDevice *dev,

                    uint8_t *dest, size_t len)

{

    uint8_t bLength = 0x12;

    if (len < bLength) {

        return -1;

    }

    dest[0x00] = bLength;

    dest[0x01] = USB_DT_DEVICE;

    dest[0x02] = usb_lo(dev->bcdUSB);

    dest[0x03] = usb_hi(dev->bcdUSB);

    dest[0x04] = dev->bDeviceClass;

    dest[0x05] = dev->bDeviceSubClass;

    dest[0x06] = dev->bDeviceProtocol;

    dest[0x07] = dev->bMaxPacketSize0;

    dest[0x08] = usb_lo(id->idVendor);

    dest[0x09] = usb_hi(id->idVendor);

    dest[0x0a] = usb_lo(id->idProduct);

    dest[0x0b] = usb_hi(id->idProduct);

    dest[0x0c] = usb_lo(id->bcdDevice);

    dest[0x0d] = usb_hi(id->bcdDevice);

    dest[0x0e] = id->iManufacturer;

    dest[0x0f] = id->iProduct;

    dest[0x10] = id->iSerialNumber;

    dest[0x11] = dev->bNumConfigurations;

    return bLength;

}

int usb_desc_device_qualifier(const USBDescDevice *dev,

                              uint8_t *dest, size_t len)

{

    uint8_t bLength = 0x0a;

    if (len < bLength) {

        return -1;

    }

    dest[0x00] = bLength;

    dest[0x01] = USB_DT_DEVICE_QUALIFIER;

    dest[0x02] = usb_lo(dev->bcdUSB);

    dest[0x03] = usb_hi(dev->bcdUSB);

    dest[0x04] = dev->bDeviceClass;

    dest[0x05] = dev->bDeviceSubClass;

    dest[0x06] = dev->bDeviceProtocol;

    dest[0x07] = dev->bMaxPacketSize0;

    dest[0x08] = dev->bNumConfigurations;

    dest[0x09] = 0; /* reserved */

    return bLength;

}

int usb_desc_config(const USBDescConfig *conf, uint8_t *dest, size_t len)

{

    uint8_t  bLength = 0x09;

    uint16_t wTotalLength = 0;

    int i, rc;

    if (len < bLength) {

        return -1;

    }

    dest[0x00] = bLength;

    dest[0x01] = USB_DT_CONFIG;

    dest[0x04] = conf->bNumInterfaces;

    dest[0x05] = conf->bConfigurationValue;

    dest[0x06] = conf->iConfiguration;

    dest[0x07] = conf->bmAttributes;

    dest[0x08] = conf->bMaxPower;

    wTotalLength += bLength;

    /* handle grouped interfaces if any*/

    for (i = 0; i < conf->nif_groups; i++) {

        rc = usb_desc_iface_group(&(conf->if_groups[i]),

                                  dest + wTotalLength,

                                  len - wTotalLength);

        if (rc < 0) {

            return rc;

        }

        wTotalLength += rc;

    }

    /* handle normal (ungrouped / no IAD) interfaces if any */

    for (i = 0; i < conf->nif; i++) {

        rc = usb_desc_iface(conf->ifs + i, dest + wTotalLength, len - wTotalLength);

        if (rc < 0) {

            return rc;

        }

        wTotalLength += rc;

    }

    dest[0x02] = usb_lo(wTotalLength);

    dest[0x03] = usb_hi(wTotalLength);

    return wTotalLength;

}

int usb_desc_iface_group(const USBDescIfaceAssoc *iad, uint8_t *dest,

                         size_t len)

{

    int pos = 0;

    int i = 0;

    /* handle interface association descriptor */

    uint8_t bLength = 0x08;

    if (len < bLength) {

        return -1;

    }

    dest[0x00] = bLength;

    dest[0x01] = USB_DT_INTERFACE_ASSOC;

    dest[0x02] = iad->bFirstInterface;

    dest[0x03] = iad->bInterfaceCount;

    dest[0x04] = iad->bFunctionClass;

    dest[0x05] = iad->bFunctionSubClass;

    dest[0x06] = iad->bFunctionProtocol;

    dest[0x07] = iad->iFunction;

    pos += bLength;

    /* handle associated interfaces in this group */

    for (i = 0; i < iad->nif; i++) {

        int rc = usb_desc_iface(&(iad->ifs[i]), dest + pos, len - pos);

        if (rc < 0) {

            return rc;

        }

        pos += rc;

    }

    return pos;

}

int usb_desc_iface(const USBDescIface *iface, uint8_t *dest, size_t len)

{

    uint8_t bLength = 0x09;

    int i, rc, pos = 0;

    if (len < bLength) {

        return -1;

    }

    dest[0x00] = bLength;

    dest[0x01] = USB_DT_INTERFACE;

    dest[0x02] = iface->bInterfaceNumber;

    dest[0x03] = iface->bAlternateSetting;

    dest[0x04] = iface->bNumEndpoints;

    dest[0x05] = iface->bInterfaceClass;

    dest[0x06] = iface->bInterfaceSubClass;

    dest[0x07] = iface->bInterfaceProtocol;

    dest[0x08] = iface->iInterface;

    pos += bLength;

    for (i = 0; i < iface->ndesc; i++) {

        rc = usb_desc_other(iface->descs + i, dest + pos, len - pos);

        if (rc < 0) {

            return rc;

        }

        pos += rc;

    }

    for (i = 0; i < iface->bNumEndpoints; i++) {

        rc = usb_desc_endpoint(iface->eps + i, dest + pos, len - pos);

        if (rc < 0) {

            return rc;

        }

        pos += rc;

    }

    return pos;

}

int usb_desc_endpoint(const USBDescEndpoint *ep, uint8_t *dest, size_t len)

{

    uint8_t bLength = 0x07;

    if (len < bLength) {

        return -1;

    }

    dest[0x00] = bLength;

    dest[0x01] = USB_DT_ENDPOINT;

    dest[0x02] = ep->bEndpointAddress;

    dest[0x03] = ep->bmAttributes;

    dest[0x04] = usb_lo(ep->wMaxPacketSize);

    dest[0x05] = usb_hi(ep->wMaxPacketSize);

    dest[0x06] = ep->bInterval;

    return bLength;

}

int usb_desc_other(const USBDescOther *desc, uint8_t *dest, size_t len)

{

    int bLength = desc->length ? desc->length : desc->data[0];

    if (len < bLength) {

        return -1;

    }

    memcpy(dest, desc->data, bLength);

    return bLength;

}

/* ------------------------------------------------------------------ */

static void usb_desc_setdefaults(USBDevice *dev)

{

    const USBDesc *desc = dev->info->usb_desc;

    assert(desc != NULL);

    switch (dev->speed) {

    case USB_SPEED_LOW:

    case USB_SPEED_FULL:

        dev->device = desc->full;

        break;

    case USB_SPEED_HIGH:

        dev->device = desc->high;

        break;

    }

    dev->config = dev->device->confs;

}

void usb_desc_init(USBDevice *dev)

{

    const USBDesc *desc = dev->info->usb_desc;

    assert(desc != NULL);

    dev->speed = USB_SPEED_FULL;

    dev->speedmask = 0;

    if (desc->full) {

        dev->speedmask |= USB_SPEED_MASK_FULL;

    }

    if (desc->high) {

        dev->speedmask |= USB_SPEED_MASK_HIGH;

    }

    usb_desc_setdefaults(dev);

}

void usb_desc_attach(USBDevice *dev)

{

    const USBDesc *desc = dev->info->usb_desc;

    assert(desc != NULL);

    if (desc->high && (dev->port->speedmask & USB_SPEED_MASK_HIGH)) {

        dev->speed = USB_SPEED_HIGH;

    } else if (desc->full && (dev->port->speedmask & USB_SPEED_MASK_FULL)) {

        dev->speed = USB_SPEED_FULL;

    } else {

        fprintf(stderr, "usb: port/device speed mismatch for \"%s\"\n",

                dev->info->product_desc);

        return;

    }

    usb_desc_setdefaults(dev);

}

void usb_desc_set_string(USBDevice *dev, uint8_t index, const char *str)

{

    USBDescString *s;

    QLIST_FOREACH(s, &dev->strings, next) {

        if (s->index == index) {

            break;

        }

    }

    if (s == NULL) {

        s = qemu_mallocz(sizeof(*s));

        s->index = index;

        QLIST_INSERT_HEAD(&dev->strings, s, next);

    }

    qemu_free(s->str);

    s->str = qemu_strdup(str);

}

const char *usb_desc_get_string(USBDevice *dev, uint8_t index)

{

    USBDescString *s;

    QLIST_FOREACH(s, &dev->strings, next) {

        if (s->index == index) {

            return s->str;

        }

    }

    return NULL;

}

int usb_desc_string(USBDevice *dev, int index, uint8_t *dest, size_t len)

{

    uint8_t bLength, pos, i;

    const char *str;

    if (len < 4) {

        return -1;

    }

    if (index == 0) {

        /* language ids */

        dest[0] = 4;

        dest[1] = USB_DT_STRING;

        dest[2] = 0x09;

        dest[3] = 0x04;

        return 4;

    }

    str = usb_desc_get_string(dev, index);

    if (str == NULL) {

        str = dev->info->usb_desc->str[index];

        if (str == NULL) {

            return 0;

        }

    }

    bLength = strlen(str) * 2 + 2;

    dest[0] = bLength;

    dest[1] = USB_DT_STRING;

    i = 0; pos = 2;

    while (pos+1 < bLength && pos+1 < len) {

        dest[pos++] = str[i++];

        dest[pos++] = 0;

    }

    return pos;

}

int usb_desc_get_descriptor(USBDevice *dev, int value, uint8_t *dest, size_t len)

{

    const USBDesc *desc = dev->info->usb_desc;

    const USBDescDevice *other_dev;

    uint8_t buf[256];

    uint8_t type = value >> 8;

    uint8_t index = value & 0xff;

    int ret = -1;

    if (dev->speed == USB_SPEED_HIGH) {

        other_dev = dev->info->usb_desc->full;

    } else {

        other_dev = dev->info->usb_desc->high;

    }

    switch(type) {

    case USB_DT_DEVICE:

        ret = usb_desc_device(&desc->id, dev->device, buf, sizeof(buf));

        trace_usb_desc_device(dev->addr, len, ret);

        break;

    case USB_DT_CONFIG:

        if (index < dev->device->bNumConfigurations) {

            ret = usb_desc_config(dev->device->confs + index, buf, sizeof(buf));

        }

        trace_usb_desc_config(dev->addr, index, len, ret);

        break;

    case USB_DT_STRING:

        ret = usb_desc_string(dev, index, buf, sizeof(buf));

        trace_usb_desc_string(dev->addr, index, len, ret);

        break;

    case USB_DT_DEVICE_QUALIFIER:

        if (other_dev != NULL) {

            ret = usb_desc_device_qualifier(other_dev, buf, sizeof(buf));

        }

        trace_usb_desc_device_qualifier(dev->addr, len, ret);

        break;

    case USB_DT_OTHER_SPEED_CONFIG:

        if (other_dev != NULL && index < other_dev->bNumConfigurations) {

            ret = usb_desc_config(other_dev->confs + index, buf, sizeof(buf));

            buf[0x01] = USB_DT_OTHER_SPEED_CONFIG;

        }

        trace_usb_desc_other_speed_config(dev->addr, index, len, ret);

        break;

    case USB_DT_DEBUG:

        /* ignore silently */

        break;

    default:

        fprintf(stderr, "%s: %d unknown type %d (len %zd)\n", __FUNCTION__,

                dev->addr, type, len);

        break;

    }

    if (ret > 0) {

        if (ret > len) {

            ret = len;

        }

        memcpy(dest, buf, ret);

    }

    return ret;

}

int usb_desc_handle_control(USBDevice *dev, USBPacket *p,

        int request, int value, int index, int length, uint8_t *data)

{

    const USBDesc *desc = dev->info->usb_desc;

    int i, ret = -1;

    assert(desc != NULL);

    switch(request) {

    case DeviceOutRequest | USB_REQ_SET_ADDRESS:

        dev->addr = value;

        trace_usb_set_addr(dev->addr);

        ret = 0;

        break;

    case DeviceRequest | USB_REQ_GET_DESCRIPTOR:

        ret = usb_desc_get_descriptor(dev, value, data, length);

        break;

    case DeviceRequest | USB_REQ_GET_CONFIGURATION:

        data[0] = dev->config->bConfigurationValue;

        ret = 1;

        break;

    case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:

        for (i = 0; i < dev->device->bNumConfigurations; i++) {

            if (dev->device->confs[i].bConfigurationValue == value) {

                dev->config = dev->device->confs + i;

                ret = 0;

            }

        }

        trace_usb_set_config(dev->addr, value, ret);

        break;

    case DeviceRequest | USB_REQ_GET_STATUS:

        data[0] = 0;

        if (dev->config->bmAttributes & 0x40) {

            data[0] |= 1 << USB_DEVICE_SELF_POWERED;

        }

        if (dev->remote_wakeup) {

            data[0] |= 1 << USB_DEVICE_REMOTE_WAKEUP;

        }

        data[1] = 0x00;

        ret = 2;

        break;

    case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:

        if (value == USB_DEVICE_REMOTE_WAKEUP) {

            dev->remote_wakeup = 0;

            ret = 0;

        }

        trace_usb_clear_device_feature(dev->addr, value, ret);

        break;

    case DeviceOutRequest | USB_REQ_SET_FEATURE:

        if (value == USB_DEVICE_REMOTE_WAKEUP) {

            dev->remote_wakeup = 1;

            ret = 0;

        }

        trace_usb_set_device_feature(dev->addr, value, ret);

        break;

    }

    return ret;

}