[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, count;

    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;

    count = conf->nif ? conf->nif : conf->bNumInterfaces;
    for (i = 0; i < count; 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;
	79	int i, rc, count;
	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
	94	count = conf->nif ? conf->nif : conf->bNumInterfaces;
	95	for (i = 0; i < count; i++) {
	96	rc = usb_desc_iface(conf->ifs + i, dest + wTotalLength, len - wTotalLength);
	97	if (rc < 0) {
	98	return rc;
	99	}
	100	wTotalLength += rc;
	101	}
	102
	103	dest[0x02] = usb_lo(wTotalLength);
	104	dest[0x03] = usb_hi(wTotalLength);
	105	return wTotalLength;
	106	}
	107
	108	int usb_desc_iface(const USBDescIface iface, uint8_t dest, size_t len)
	109	{
	110	uint8_t bLength = 0x09;
	111	int i, rc, pos = 0;
	112
	113	if (len < bLength) {
	114	return -1;
	115	}
	116
	117	dest[0x00] = bLength;
	118	dest[0x01] = USB_DT_INTERFACE;
	119	dest[0x02] = iface->bInterfaceNumber;
	120	dest[0x03] = iface->bAlternateSetting;
	121	dest[0x04] = iface->bNumEndpoints;
	122	dest[0x05] = iface->bInterfaceClass;
	123	dest[0x06] = iface->bInterfaceSubClass;
	124	dest[0x07] = iface->bInterfaceProtocol;
	125	dest[0x08] = iface->iInterface;
	126	pos += bLength;
	127
	128	for (i = 0; i < iface->ndesc; i++) {
	129	rc = usb_desc_other(iface->descs + i, dest + pos, len - pos);
	130	if (rc < 0) {
	131	return rc;
	132	}
	133	pos += rc;
	134	}
	135
	136	for (i = 0; i < iface->bNumEndpoints; i++) {
	137	rc = usb_desc_endpoint(iface->eps + i, dest + pos, len - pos);
	138	if (rc < 0) {
139	return rc;
140	}
141	pos += rc;
142	}
143
144	return pos;
145	}
146
147	int usb_desc_endpoint(const USBDescEndpoint ep, uint8_t dest, size_t len)
148	{
149	uint8_t bLength = 0x07;
150
151	if (len < bLength) {
152	return -1;
153	}
154
155	dest[0x00] = bLength;
156	dest[0x01] = USB_DT_ENDPOINT;
157	dest[0x02] = ep->bEndpointAddress;
158	dest[0x03] = ep->bmAttributes;
159	dest[0x04] = usb_lo(ep->wMaxPacketSize);
160	dest[0x05] = usb_hi(ep->wMaxPacketSize);
161	dest[0x06] = ep->bInterval;
162
163	return bLength;
164	}
165
166	int usb_desc_other(const USBDescOther desc, uint8_t dest, size_t len)
167	{
168	int bLength = desc->length ? desc->length : desc->data[0];
169
170	if (len < bLength) {
171	return -1;
172	}
173
174	memcpy(dest, desc->data, bLength);
175	return bLength;
176	}
177
132a3f55 GH	178	/* ------------------------------------------------------------------ */
132a3f55 GH	179
32d41919	180	static void usb_desc_setdefaults(USBDevice *dev)
a980a065 GH	181	{
	182	const USBDesc *desc = dev->info->usb_desc;
	183
	184	assert(desc != NULL);
32d41919 GH	185	switch (dev->speed) {
	186	case USB_SPEED_LOW:
	187	case USB_SPEED_FULL:
	188	dev->device = desc->full;
	189	break;
	190	case USB_SPEED_HIGH:
	191	dev->device = desc->high;
	192	break;
	193	}
a980a065 GH	194	dev->config = dev->device->confs;
	195	}
	196
32d41919 GH	197	void usb_desc_init(USBDevice *dev)
	198	{
	199	dev->speed = USB_SPEED_FULL;
	200	usb_desc_setdefaults(dev);
	201	}
	202
	203	void usb_desc_attach(USBDevice *dev)
	204	{
	205	const USBDesc *desc = dev->info->usb_desc;
	206
	207	assert(desc != NULL);
	208	if (desc->high && (dev->port->speedmask & USB_SPEED_MASK_HIGH)) {
	209	dev->speed = USB_SPEED_HIGH;
	210	} else if (desc->full && (dev->port->speedmask & USB_SPEED_MASK_FULL)) {
	211	dev->speed = USB_SPEED_FULL;
	212	} else {
	213	fprintf(stderr, "usb: port/device speed mismatch for \"%s\"\n",
	214	dev->info->product_desc);
	215	return;
	216	}
	217	usb_desc_setdefaults(dev);
	218	}
	219
132a3f55 GH	220	void usb_desc_set_string(USBDevice dev, uint8_t index, const char str)
	221	{
	222	USBDescString *s;
	223
	224	QLIST_FOREACH(s, &dev->strings, next) {
	225	if (s->index == index) {
	226	break;
	227	}
	228	}
	229	if (s == NULL) {
	230	s = qemu_mallocz(sizeof(*s));
	231	s->index = index;
	232	QLIST_INSERT_HEAD(&dev->strings, s, next);
	233	}
	234	qemu_free(s->str);
	235	s->str = qemu_strdup(str);
	236	}
	237
	238	const char usb_desc_get_string(USBDevice dev, uint8_t index)
	239	{
	240	USBDescString *s;
	241
	242	QLIST_FOREACH(s, &dev->strings, next) {
	243	if (s->index == index) {
	244	return s->str;
	245	}
	246	}
	247	return NULL;
	248	}
	249
	250	int usb_desc_string(USBDevice dev, int index, uint8_t dest, size_t len)
37fb59d3 GH	251	{
37fb59d3 GH	252	uint8_t bLength, pos, i;
132a3f55	253	const char *str;
37fb59d3 GH	254
	255	if (len < 4) {
	256	return -1;
	257	}
	258
	259	if (index == 0) {
	260	/* language ids */
	261	dest[0] = 4;
	262	dest[1] = USB_DT_STRING;
	263	dest[2] = 0x09;
	264	dest[3] = 0x04;
	265	return 4;
	266	}
	267
132a3f55 GH	268	str = usb_desc_get_string(dev, index);
	269	if (str == NULL) {
	270	str = dev->info->usb_desc->str[index];
	271	if (str == NULL) {
	272	return 0;
	273	}
37fb59d3	274	}
132a3f55 GH	275
132a3f55 GH	276	bLength = strlen(str) * 2 + 2;
37fb59d3 GH	277	dest[0] = bLength;
	278	dest[1] = USB_DT_STRING;
	279	i = 0; pos = 2;
	280	while (pos+1 < bLength && pos+1 < len) {
132a3f55	281	dest[pos++] = str[i++];
37fb59d3 GH	282	dest[pos++] = 0;
	283	}
	284	return pos;
	285	}
	286
37fb59d3 GH	287	int usb_desc_get_descriptor(USBDevice dev, int value, uint8_t dest, size_t len)
	288	{
	289	const USBDesc *desc = dev->info->usb_desc;
25620cba	290	const USBDescDevice *other_dev;
37fb59d3 GH	291	uint8_t buf[256];
	292	uint8_t type = value >> 8;
	293	uint8_t index = value & 0xff;
	294	int ret = -1;
	295
25620cba GH	296	if (dev->speed == USB_SPEED_HIGH) {
	297	other_dev = dev->info->usb_desc->full;
	298	} else {
	299	other_dev = dev->info->usb_desc->high;
	300	}
	301
37fb59d3 GH	302	switch(type) {
37fb59d3 GH	303	case USB_DT_DEVICE:
a980a065	304	ret = usb_desc_device(&desc->id, dev->device, buf, sizeof(buf));
37fb59d3 GH	305	trace_usb_desc_device(dev->addr, len, ret);
	306	break;
	307	case USB_DT_CONFIG:
a980a065 GH	308	if (index < dev->device->bNumConfigurations) {
a980a065 GH	309	ret = usb_desc_config(dev->device->confs + index, buf, sizeof(buf));
37fb59d3 GH	310	}
	311	trace_usb_desc_config(dev->addr, index, len, ret);
	312	break;
	313	case USB_DT_STRING:
132a3f55	314	ret = usb_desc_string(dev, index, buf, sizeof(buf));
37fb59d3 GH	315	trace_usb_desc_string(dev->addr, index, len, ret);
37fb59d3 GH	316	break;
25620cba GH	317
	318	case USB_DT_DEVICE_QUALIFIER:
	319	if (other_dev != NULL) {
	320	ret = usb_desc_device_qualifier(other_dev, buf, sizeof(buf));
	321	}
	322	trace_usb_desc_device_qualifier(dev->addr, len, ret);
	323	break;
	324	case USB_DT_OTHER_SPEED_CONFIG:
	325	if (other_dev != NULL && index < other_dev->bNumConfigurations) {
	326	ret = usb_desc_config(other_dev->confs + index, buf, sizeof(buf));
	327	buf[0x01] = USB_DT_OTHER_SPEED_CONFIG;
	328	}
	329	trace_usb_desc_other_speed_config(dev->addr, index, len, ret);
	330	break;
	331
37fb59d3 GH	332	default:
	333	fprintf(stderr, "%s: %d unknown type %d (len %zd)\n", __FUNCTION__,
	334	dev->addr, type, len);
	335	break;
	336	}
	337
	338	if (ret > 0) {
	339	if (ret > len) {
	340	ret = len;
	341	}
	342	memcpy(dest, buf, ret);
	343	}
	344	return ret;
	345	}
	346
	347	int usb_desc_handle_control(USBDevice *dev, int request, int value,
	348	int index, int length, uint8_t *data)
	349	{
	350	const USBDesc *desc = dev->info->usb_desc;
a980a065	351	int i, ret = -1;
37fb59d3 GH	352
	353	assert(desc != NULL);
	354	switch(request) {
41c6abbd GH	355	case DeviceOutRequest \| USB_REQ_SET_ADDRESS:
	356	dev->addr = value;
	357	trace_usb_set_addr(dev->addr);
	358	ret = 0;
	359	break;
	360
37fb59d3 GH	361	case DeviceRequest \| USB_REQ_GET_DESCRIPTOR:
	362	ret = usb_desc_get_descriptor(dev, value, data, length);
	363	break;
a980a065 GH	364
	365	case DeviceRequest \| USB_REQ_GET_CONFIGURATION:
	366	data[0] = dev->config->bConfigurationValue;
	367	ret = 1;
	368	break;
	369	case DeviceOutRequest \| USB_REQ_SET_CONFIGURATION:
	370	for (i = 0; i < dev->device->bNumConfigurations; i++) {
	371	if (dev->device->confs[i].bConfigurationValue == value) {
	372	dev->config = dev->device->confs + i;
	373	ret = 0;
	374	}
	375	}
	376	trace_usb_set_config(dev->addr, value, ret);
	377	break;
ed5a83dd GH	378
	379	case DeviceRequest \| USB_REQ_GET_STATUS:
	380	data[0] = 0;
	381	if (dev->config->bmAttributes & 0x40) {
	382	data[0] \|= 1 << USB_DEVICE_SELF_POWERED;
	383	}
	384	if (dev->remote_wakeup) {
	385	data[0] \|= 1 << USB_DEVICE_REMOTE_WAKEUP;
	386	}
	387	data[1] = 0x00;
	388	ret = 2;
	389	break;
	390	case DeviceOutRequest \| USB_REQ_CLEAR_FEATURE:
	391	if (value == USB_DEVICE_REMOTE_WAKEUP) {
	392	dev->remote_wakeup = 0;
	393	ret = 0;
	394	}
	395	trace_usb_clear_device_feature(dev->addr, value, ret);
	396	break;
	397	case DeviceOutRequest \| USB_REQ_SET_FEATURE:
	398	if (value == USB_DEVICE_REMOTE_WAKEUP) {
	399	dev->remote_wakeup = 1;
	400	ret = 0;
	401	}
	402	trace_usb_set_device_feature(dev->addr, value, ret);
	403	break;
37fb59d3 GH	404	}
	405	return ret;
	406	}