[qemu.git] / hw / usb-desc.c

#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;

    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(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)
{
    dev->speed = USB_SPEED_FULL;
    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;

    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, 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;
}
Commit	Line	Data
37fb59d3 GH	1	#include "usb.h"
	2	#include "usb-desc.h"
	3	#include "trace.h"
	4
	5	/* ------------------------------------------------------------------ */
	6
	7	static uint8_t usb_lo(uint16_t val)
	8	{
	9	return val & 0xff;
	10	}
	11
	12	static uint8_t usb_hi(uint16_t val)
	13	{
	14	return (val >> 8) & 0xff;
	15	}
	16
	17	int usb_desc_device(const USBDescID id, const USBDescDevice dev,
	18	uint8_t *dest, size_t len)
	19	{
	20	uint8_t bLength = 0x12;
	21
	22	if (len < bLength) {
	23	return -1;
	24	}
	25
	26	dest[0x00] = bLength;
	27	dest[0x01] = USB_DT_DEVICE;
	28
	29	dest[0x02] = usb_lo(dev->bcdUSB);
	30	dest[0x03] = usb_hi(dev->bcdUSB);
	31	dest[0x04] = dev->bDeviceClass;
	32	dest[0x05] = dev->bDeviceSubClass;
	33	dest[0x06] = dev->bDeviceProtocol;
	34	dest[0x07] = dev->bMaxPacketSize0;
	35
	36	dest[0x08] = usb_lo(id->idVendor);
	37	dest[0x09] = usb_hi(id->idVendor);
	38	dest[0x0a] = usb_lo(id->idProduct);
	39	dest[0x0b] = usb_hi(id->idProduct);
	40	dest[0x0c] = usb_lo(id->bcdDevice);
	41	dest[0x0d] = usb_hi(id->bcdDevice);
	42	dest[0x0e] = id->iManufacturer;
	43	dest[0x0f] = id->iProduct;
	44	dest[0x10] = id->iSerialNumber;
	45
	46	dest[0x11] = dev->bNumConfigurations;
	47
	48	return bLength;
	49	}
	50
25620cba GH	51	int usb_desc_device_qualifier(const USBDescDevice *dev,
	52	uint8_t *dest, size_t len)
	53	{
	54	uint8_t bLength = 0x0a;
	55
	56	if (len < bLength) {
	57	return -1;
	58	}
	59
	60	dest[0x00] = bLength;
	61	dest[0x01] = USB_DT_DEVICE_QUALIFIER;
	62
	63	dest[0x02] = usb_lo(dev->bcdUSB);
	64	dest[0x03] = usb_hi(dev->bcdUSB);
	65	dest[0x04] = dev->bDeviceClass;
	66	dest[0x05] = dev->bDeviceSubClass;
	67	dest[0x06] = dev->bDeviceProtocol;
	68	dest[0x07] = dev->bMaxPacketSize0;
	69	dest[0x08] = dev->bNumConfigurations;
	70	dest[0x09] = 0; /* reserved */
	71
	72	return bLength;
	73	}
	74
37fb59d3 GH	75	int usb_desc_config(const USBDescConfig conf, uint8_t dest, size_t len)
	76	{
	77	uint8_t bLength = 0x09;
	78	uint16_t wTotalLength = 0;
fef13fa8	79	int i, rc;
37fb59d3 GH	80
	81	if (len < bLength) {
	82	return -1;
	83	}
	84
	85	dest[0x00] = bLength;
	86	dest[0x01] = USB_DT_CONFIG;
	87	dest[0x04] = conf->bNumInterfaces;
	88	dest[0x05] = conf->bConfigurationValue;
	89	dest[0x06] = conf->iConfiguration;
	90	dest[0x07] = conf->bmAttributes;
	91	dest[0x08] = conf->bMaxPower;
	92	wTotalLength += bLength;
	93
fef13fa8	94	for (i = 0; i < conf->nif; i++) {
37fb59d3 GH	95	rc = usb_desc_iface(conf->ifs + i, dest + wTotalLength, len - wTotalLength);
	96	if (rc < 0) {
	97	return rc;
	98	}
	99	wTotalLength += rc;
	100	}
	101
	102	dest[0x02] = usb_lo(wTotalLength);
	103	dest[0x03] = usb_hi(wTotalLength);
	104	return wTotalLength;
	105	}
	106
	107	int usb_desc_iface(const USBDescIface iface, uint8_t dest, size_t len)
	108	{
	109	uint8_t bLength = 0x09;
	110	int i, rc, pos = 0;
	111
	112	if (len < bLength) {
	113	return -1;
	114	}
	115
	116	dest[0x00] = bLength;
	117	dest[0x01] = USB_DT_INTERFACE;
	118	dest[0x02] = iface->bInterfaceNumber;
	119	dest[0x03] = iface->bAlternateSetting;
	120	dest[0x04] = iface->bNumEndpoints;
	121	dest[0x05] = iface->bInterfaceClass;
	122	dest[0x06] = iface->bInterfaceSubClass;
	123	dest[0x07] = iface->bInterfaceProtocol;
	124	dest[0x08] = iface->iInterface;
	125	pos += bLength;
	126
	127	for (i = 0; i < iface->ndesc; i++) {
	128	rc = usb_desc_other(iface->descs + i, dest + pos, len - pos);
	129	if (rc < 0) {
	130	return rc;
	131	}
	132	pos += rc;
	133	}
	134
	135	for (i = 0; i < iface->bNumEndpoints; i++) {
	136	rc = usb_desc_endpoint(iface->eps + i, dest + pos, len - pos);
	137	if (rc < 0) {
	138	return rc;
	139	}
	140	pos += rc;
	141	}
	142
	143	return pos;
	144	}
	145
	146	int usb_desc_endpoint(const USBDescEndpoint ep, uint8_t dest, size_t len)
	147	{
	148	uint8_t bLength = 0x07;
	149
	150	if (len < bLength) {
	151	return -1;
	152	}
	153
	154	dest[0x00] = bLength;
	155	dest[0x01] = USB_DT_ENDPOINT;
	156	dest[0x02] = ep->bEndpointAddress;
	157	dest[0x03] = ep->bmAttributes;
	158	dest[0x04] = usb_lo(ep->wMaxPacketSize);
159	dest[0x05] = usb_hi(ep->wMaxPacketSize);
160	dest[0x06] = ep->bInterval;
161
162	return bLength;
163	}
164
165	int usb_desc_other(const USBDescOther desc, uint8_t dest, size_t len)
166	{
167	int bLength = desc->length ? desc->length : desc->data[0];
168
169	if (len < bLength) {
170	return -1;
171	}
172
173	memcpy(dest, desc->data, bLength);
174	return bLength;
175	}
176
132a3f55 GH	177	/* ------------------------------------------------------------------ */
132a3f55 GH	178
32d41919	179	static void usb_desc_setdefaults(USBDevice *dev)
a980a065 GH	180	{
	181	const USBDesc *desc = dev->info->usb_desc;
	182
	183	assert(desc != NULL);
32d41919 GH	184	switch (dev->speed) {
	185	case USB_SPEED_LOW:
	186	case USB_SPEED_FULL:
	187	dev->device = desc->full;
	188	break;
	189	case USB_SPEED_HIGH:
	190	dev->device = desc->high;
	191	break;
	192	}
a980a065 GH	193	dev->config = dev->device->confs;
	194	}
	195
32d41919 GH	196	void usb_desc_init(USBDevice *dev)
	197	{
	198	dev->speed = USB_SPEED_FULL;
	199	usb_desc_setdefaults(dev);
	200	}
	201
	202	void usb_desc_attach(USBDevice *dev)
	203	{
	204	const USBDesc *desc = dev->info->usb_desc;
	205
	206	assert(desc != NULL);
	207	if (desc->high && (dev->port->speedmask & USB_SPEED_MASK_HIGH)) {
	208	dev->speed = USB_SPEED_HIGH;
	209	} else if (desc->full && (dev->port->speedmask & USB_SPEED_MASK_FULL)) {
	210	dev->speed = USB_SPEED_FULL;
	211	} else {
	212	fprintf(stderr, "usb: port/device speed mismatch for \"%s\"\n",
	213	dev->info->product_desc);
	214	return;
	215	}
	216	usb_desc_setdefaults(dev);
	217	}
	218
132a3f55 GH	219	void usb_desc_set_string(USBDevice dev, uint8_t index, const char str)
	220	{
	221	USBDescString *s;
	222
	223	QLIST_FOREACH(s, &dev->strings, next) {
	224	if (s->index == index) {
	225	break;
	226	}
	227	}
	228	if (s == NULL) {
	229	s = qemu_mallocz(sizeof(*s));
	230	s->index = index;
	231	QLIST_INSERT_HEAD(&dev->strings, s, next);
	232	}
	233	qemu_free(s->str);
	234	s->str = qemu_strdup(str);
	235	}
	236
	237	const char usb_desc_get_string(USBDevice dev, uint8_t index)
	238	{
	239	USBDescString *s;
	240
	241	QLIST_FOREACH(s, &dev->strings, next) {
	242	if (s->index == index) {
	243	return s->str;
	244	}
	245	}
	246	return NULL;
	247	}
	248
	249	int usb_desc_string(USBDevice dev, int index, uint8_t dest, size_t len)
37fb59d3 GH	250	{
37fb59d3 GH	251	uint8_t bLength, pos, i;
132a3f55	252	const char *str;
37fb59d3 GH	253
	254	if (len < 4) {
	255	return -1;
	256	}
	257
	258	if (index == 0) {
	259	/* language ids */
	260	dest[0] = 4;
	261	dest[1] = USB_DT_STRING;
	262	dest[2] = 0x09;
	263	dest[3] = 0x04;
	264	return 4;
	265	}
	266
132a3f55 GH	267	str = usb_desc_get_string(dev, index);
	268	if (str == NULL) {
	269	str = dev->info->usb_desc->str[index];
	270	if (str == NULL) {
	271	return 0;
	272	}
37fb59d3	273	}
132a3f55 GH	274
132a3f55 GH	275	bLength = strlen(str) * 2 + 2;
37fb59d3 GH	276	dest[0] = bLength;
	277	dest[1] = USB_DT_STRING;
	278	i = 0; pos = 2;
	279	while (pos+1 < bLength && pos+1 < len) {
132a3f55	280	dest[pos++] = str[i++];
37fb59d3 GH	281	dest[pos++] = 0;
	282	}
	283	return pos;
	284	}
	285
37fb59d3 GH	286	int usb_desc_get_descriptor(USBDevice dev, int value, uint8_t dest, size_t len)
	287	{
	288	const USBDesc *desc = dev->info->usb_desc;
25620cba	289	const USBDescDevice *other_dev;
37fb59d3 GH	290	uint8_t buf[256];
	291	uint8_t type = value >> 8;
	292	uint8_t index = value & 0xff;
	293	int ret = -1;
	294
25620cba GH	295	if (dev->speed == USB_SPEED_HIGH) {
	296	other_dev = dev->info->usb_desc->full;
	297	} else {
	298	other_dev = dev->info->usb_desc->high;
	299	}
	300
37fb59d3 GH	301	switch(type) {
37fb59d3 GH	302	case USB_DT_DEVICE:
a980a065	303	ret = usb_desc_device(&desc->id, dev->device, buf, sizeof(buf));
37fb59d3 GH	304	trace_usb_desc_device(dev->addr, len, ret);
	305	break;
	306	case USB_DT_CONFIG:
a980a065 GH	307	if (index < dev->device->bNumConfigurations) {
a980a065 GH	308	ret = usb_desc_config(dev->device->confs + index, buf, sizeof(buf));
37fb59d3 GH	309	}
	310	trace_usb_desc_config(dev->addr, index, len, ret);
	311	break;
	312	case USB_DT_STRING:
132a3f55	313	ret = usb_desc_string(dev, index, buf, sizeof(buf));
37fb59d3 GH	314	trace_usb_desc_string(dev->addr, index, len, ret);
37fb59d3 GH	315	break;
25620cba GH	316
	317	case USB_DT_DEVICE_QUALIFIER:
	318	if (other_dev != NULL) {
	319	ret = usb_desc_device_qualifier(other_dev, buf, sizeof(buf));
	320	}
	321	trace_usb_desc_device_qualifier(dev->addr, len, ret);
	322	break;
	323	case USB_DT_OTHER_SPEED_CONFIG:
	324	if (other_dev != NULL && index < other_dev->bNumConfigurations) {
	325	ret = usb_desc_config(other_dev->confs + index, buf, sizeof(buf));
	326	buf[0x01] = USB_DT_OTHER_SPEED_CONFIG;
	327	}
	328	trace_usb_desc_other_speed_config(dev->addr, index, len, ret);
	329	break;
	330
37fb59d3 GH	331	default:
	332	fprintf(stderr, "%s: %d unknown type %d (len %zd)\n", __FUNCTION__,
	333	dev->addr, type, len);
	334	break;
	335	}
	336
	337	if (ret > 0) {
	338	if (ret > len) {
	339	ret = len;
	340	}
	341	memcpy(dest, buf, ret);
	342	}
	343	return ret;
	344	}
	345
	346	int usb_desc_handle_control(USBDevice *dev, int request, int value,
	347	int index, int length, uint8_t *data)
	348	{
	349	const USBDesc *desc = dev->info->usb_desc;
a980a065	350	int i, ret = -1;
37fb59d3 GH	351
	352	assert(desc != NULL);
	353	switch(request) {
41c6abbd GH	354	case DeviceOutRequest \| USB_REQ_SET_ADDRESS:
	355	dev->addr = value;
	356	trace_usb_set_addr(dev->addr);
	357	ret = 0;
	358	break;
	359
37fb59d3 GH	360	case DeviceRequest \| USB_REQ_GET_DESCRIPTOR:
	361	ret = usb_desc_get_descriptor(dev, value, data, length);
	362	break;
a980a065 GH	363
	364	case DeviceRequest \| USB_REQ_GET_CONFIGURATION:
	365	data[0] = dev->config->bConfigurationValue;
	366	ret = 1;
	367	break;
	368	case DeviceOutRequest \| USB_REQ_SET_CONFIGURATION:
	369	for (i = 0; i < dev->device->bNumConfigurations; i++) {
	370	if (dev->device->confs[i].bConfigurationValue == value) {
	371	dev->config = dev->device->confs + i;
	372	ret = 0;
	373	}
	374	}
	375	trace_usb_set_config(dev->addr, value, ret);
	376	break;
ed5a83dd GH	377
	378	case DeviceRequest \| USB_REQ_GET_STATUS:
	379	data[0] = 0;
	380	if (dev->config->bmAttributes & 0x40) {
	381	data[0] \|= 1 << USB_DEVICE_SELF_POWERED;
	382	}
	383	if (dev->remote_wakeup) {
	384	data[0] \|= 1 << USB_DEVICE_REMOTE_WAKEUP;
	385	}
	386	data[1] = 0x00;
	387	ret = 2;
	388	break;
	389	case DeviceOutRequest \| USB_REQ_CLEAR_FEATURE:
	390	if (value == USB_DEVICE_REMOTE_WAKEUP) {
	391	dev->remote_wakeup = 0;
	392	ret = 0;
	393	}
	394	trace_usb_clear_device_feature(dev->addr, value, ret);
	395	break;
	396	case DeviceOutRequest \| USB_REQ_SET_FEATURE:
	397	if (value == USB_DEVICE_REMOTE_WAKEUP) {
	398	dev->remote_wakeup = 1;
	399	ret = 0;
	400	}
	401	trace_usb_set_device_feature(dev->addr, value, ret);
	402	break;
37fb59d3 GH	403	}
	404	return ret;
	405	}