[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;

    /* 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 = g_malloc0(sizeof(*s));
        s->index = index;
        QLIST_INSERT_HEAD(&dev->strings, s, next);
    }
    g_free(s->str);
    s->str = g_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;
}
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
6e625fc7 BH	94	/* handle grouped interfaces if any*/
	95	for (i = 0; i < conf->nif_groups; i++) {
	96	rc = usb_desc_iface_group(&(conf->if_groups[i]),
	97	dest + wTotalLength,
	98	len - wTotalLength);
	99	if (rc < 0) {
	100	return rc;
	101	}
	102	wTotalLength += rc;
	103	}
	104
	105	/* handle normal (ungrouped / no IAD) interfaces if any */
fef13fa8	106	for (i = 0; i < conf->nif; i++) {
37fb59d3 GH	107	rc = usb_desc_iface(conf->ifs + i, dest + wTotalLength, len - wTotalLength);
	108	if (rc < 0) {
	109	return rc;
	110	}
	111	wTotalLength += rc;
	112	}
	113
	114	dest[0x02] = usb_lo(wTotalLength);
	115	dest[0x03] = usb_hi(wTotalLength);
	116	return wTotalLength;
	117	}
	118
6e625fc7 BH	119	int usb_desc_iface_group(const USBDescIfaceAssoc iad, uint8_t dest,
	120	size_t len)
	121	{
	122	int pos = 0;
	123	int i = 0;
	124
	125	/* handle interface association descriptor */
	126	uint8_t bLength = 0x08;
	127
	128	if (len < bLength) {
	129	return -1;
	130	}
	131
	132	dest[0x00] = bLength;
	133	dest[0x01] = USB_DT_INTERFACE_ASSOC;
	134	dest[0x02] = iad->bFirstInterface;
	135	dest[0x03] = iad->bInterfaceCount;
	136	dest[0x04] = iad->bFunctionClass;
	137	dest[0x05] = iad->bFunctionSubClass;
	138	dest[0x06] = iad->bFunctionProtocol;
	139	dest[0x07] = iad->iFunction;
	140	pos += bLength;
	141
	142	/* handle associated interfaces in this group */
	143	for (i = 0; i < iad->nif; i++) {
	144	int rc = usb_desc_iface(&(iad->ifs[i]), dest + pos, len - pos);
	145	if (rc < 0) {
	146	return rc;
	147	}
	148	pos += rc;
	149	}
	150
	151	return pos;
	152	}
	153
37fb59d3 GH	154	int usb_desc_iface(const USBDescIface iface, uint8_t dest, size_t len)
	155	{
	156	uint8_t bLength = 0x09;
	157	int i, rc, pos = 0;
	158
	159	if (len < bLength) {
	160	return -1;
	161	}
	162
	163	dest[0x00] = bLength;
	164	dest[0x01] = USB_DT_INTERFACE;
	165	dest[0x02] = iface->bInterfaceNumber;
	166	dest[0x03] = iface->bAlternateSetting;
	167	dest[0x04] = iface->bNumEndpoints;
	168	dest[0x05] = iface->bInterfaceClass;
	169	dest[0x06] = iface->bInterfaceSubClass;
	170	dest[0x07] = iface->bInterfaceProtocol;
	171	dest[0x08] = iface->iInterface;
	172	pos += bLength;
	173
	174	for (i = 0; i < iface->ndesc; i++) {
	175	rc = usb_desc_other(iface->descs + i, dest + pos, len - pos);
	176	if (rc < 0) {
	177	return rc;
	178	}
	179	pos += rc;
	180	}
	181
	182	for (i = 0; i < iface->bNumEndpoints; i++) {
	183	rc = usb_desc_endpoint(iface->eps + i, dest + pos, len - pos);
	184	if (rc < 0) {
	185	return rc;
	186	}
	187	pos += rc;
	188	}
	189
	190	return pos;
	191	}
	192
	193	int usb_desc_endpoint(const USBDescEndpoint ep, uint8_t dest, size_t len)
	194	{
	195	uint8_t bLength = 0x07;
	196
	197	if (len < bLength) {
	198	return -1;
	199	}
	200
	201	dest[0x00] = bLength;
	202	dest[0x01] = USB_DT_ENDPOINT;
	203	dest[0x02] = ep->bEndpointAddress;
	204	dest[0x03] = ep->bmAttributes;
	205	dest[0x04] = usb_lo(ep->wMaxPacketSize);
	206	dest[0x05] = usb_hi(ep->wMaxPacketSize);
	207	dest[0x06] = ep->bInterval;
	208
	209	return bLength;
	210	}
	211
	212	int usb_desc_other(const USBDescOther desc, uint8_t dest, size_t len)
	213	{
	214	int bLength = desc->length ? desc->length : desc->data[0];
	215
	216	if (len < bLength) {
	217	return -1;
218	}
219
220	memcpy(dest, desc->data, bLength);
221	return bLength;
222	}
223
132a3f55 GH	224	/* ------------------------------------------------------------------ */
132a3f55 GH	225
32d41919	226	static void usb_desc_setdefaults(USBDevice *dev)
a980a065 GH	227	{
	228	const USBDesc *desc = dev->info->usb_desc;
	229
	230	assert(desc != NULL);
32d41919 GH	231	switch (dev->speed) {
	232	case USB_SPEED_LOW:
	233	case USB_SPEED_FULL:
	234	dev->device = desc->full;
	235	break;
	236	case USB_SPEED_HIGH:
	237	dev->device = desc->high;
	238	break;
	239	}
a980a065 GH	240	dev->config = dev->device->confs;
	241	}
	242
32d41919 GH	243	void usb_desc_init(USBDevice *dev)
32d41919 GH	244	{
ba3f9bfb HG	245	const USBDesc *desc = dev->info->usb_desc;
	246
	247	assert(desc != NULL);
32d41919	248	dev->speed = USB_SPEED_FULL;
ba3f9bfb HG	249	dev->speedmask = 0;
	250	if (desc->full) {
	251	dev->speedmask \|= USB_SPEED_MASK_FULL;
	252	}
	253	if (desc->high) {
	254	dev->speedmask \|= USB_SPEED_MASK_HIGH;
	255	}
32d41919 GH	256	usb_desc_setdefaults(dev);
	257	}
	258
	259	void usb_desc_attach(USBDevice *dev)
	260	{
	261	const USBDesc *desc = dev->info->usb_desc;
	262
	263	assert(desc != NULL);
	264	if (desc->high && (dev->port->speedmask & USB_SPEED_MASK_HIGH)) {
	265	dev->speed = USB_SPEED_HIGH;
	266	} else if (desc->full && (dev->port->speedmask & USB_SPEED_MASK_FULL)) {
	267	dev->speed = USB_SPEED_FULL;
	268	} else {
	269	fprintf(stderr, "usb: port/device speed mismatch for \"%s\"\n",
	270	dev->info->product_desc);
	271	return;
	272	}
	273	usb_desc_setdefaults(dev);
	274	}
	275
132a3f55 GH	276	void usb_desc_set_string(USBDevice dev, uint8_t index, const char str)
	277	{
	278	USBDescString *s;
	279
	280	QLIST_FOREACH(s, &dev->strings, next) {
	281	if (s->index == index) {
	282	break;
	283	}
	284	}
	285	if (s == NULL) {
7267c094	286	s = g_malloc0(sizeof(*s));
132a3f55 GH	287	s->index = index;
	288	QLIST_INSERT_HEAD(&dev->strings, s, next);
	289	}
7267c094 AL	290	g_free(s->str);
7267c094 AL	291	s->str = g_strdup(str);
132a3f55 GH	292	}
	293
	294	const char usb_desc_get_string(USBDevice dev, uint8_t index)
	295	{
	296	USBDescString *s;
	297
	298	QLIST_FOREACH(s, &dev->strings, next) {
	299	if (s->index == index) {
	300	return s->str;
	301	}
	302	}
	303	return NULL;
	304	}
	305
	306	int usb_desc_string(USBDevice dev, int index, uint8_t dest, size_t len)
37fb59d3 GH	307	{
37fb59d3 GH	308	uint8_t bLength, pos, i;
132a3f55	309	const char *str;
37fb59d3 GH	310
	311	if (len < 4) {
	312	return -1;
	313	}
	314
	315	if (index == 0) {
	316	/* language ids */
	317	dest[0] = 4;
	318	dest[1] = USB_DT_STRING;
	319	dest[2] = 0x09;
	320	dest[3] = 0x04;
	321	return 4;
	322	}
	323
132a3f55 GH	324	str = usb_desc_get_string(dev, index);
	325	if (str == NULL) {
	326	str = dev->info->usb_desc->str[index];
	327	if (str == NULL) {
	328	return 0;
	329	}
37fb59d3	330	}
132a3f55 GH	331
132a3f55 GH	332	bLength = strlen(str) * 2 + 2;
37fb59d3 GH	333	dest[0] = bLength;
	334	dest[1] = USB_DT_STRING;
	335	i = 0; pos = 2;
	336	while (pos+1 < bLength && pos+1 < len) {
132a3f55	337	dest[pos++] = str[i++];
37fb59d3 GH	338	dest[pos++] = 0;
	339	}
	340	return pos;
	341	}
	342
37fb59d3 GH	343	int usb_desc_get_descriptor(USBDevice dev, int value, uint8_t dest, size_t len)
	344	{
	345	const USBDesc *desc = dev->info->usb_desc;
25620cba	346	const USBDescDevice *other_dev;
37fb59d3 GH	347	uint8_t buf[256];
	348	uint8_t type = value >> 8;
	349	uint8_t index = value & 0xff;
	350	int ret = -1;
	351
25620cba GH	352	if (dev->speed == USB_SPEED_HIGH) {
	353	other_dev = dev->info->usb_desc->full;
	354	} else {
	355	other_dev = dev->info->usb_desc->high;
	356	}
	357
37fb59d3 GH	358	switch(type) {
37fb59d3 GH	359	case USB_DT_DEVICE:
a980a065	360	ret = usb_desc_device(&desc->id, dev->device, buf, sizeof(buf));
37fb59d3 GH	361	trace_usb_desc_device(dev->addr, len, ret);
	362	break;
	363	case USB_DT_CONFIG:
a980a065 GH	364	if (index < dev->device->bNumConfigurations) {
a980a065 GH	365	ret = usb_desc_config(dev->device->confs + index, buf, sizeof(buf));
37fb59d3 GH	366	}
	367	trace_usb_desc_config(dev->addr, index, len, ret);
	368	break;
	369	case USB_DT_STRING:
132a3f55	370	ret = usb_desc_string(dev, index, buf, sizeof(buf));
37fb59d3 GH	371	trace_usb_desc_string(dev->addr, index, len, ret);
37fb59d3 GH	372	break;
25620cba GH	373
	374	case USB_DT_DEVICE_QUALIFIER:
	375	if (other_dev != NULL) {
	376	ret = usb_desc_device_qualifier(other_dev, buf, sizeof(buf));
	377	}
	378	trace_usb_desc_device_qualifier(dev->addr, len, ret);
	379	break;
	380	case USB_DT_OTHER_SPEED_CONFIG:
	381	if (other_dev != NULL && index < other_dev->bNumConfigurations) {
	382	ret = usb_desc_config(other_dev->confs + index, buf, sizeof(buf));
	383	buf[0x01] = USB_DT_OTHER_SPEED_CONFIG;
	384	}
	385	trace_usb_desc_other_speed_config(dev->addr, index, len, ret);
	386	break;
	387
a7fb71d1 GH	388	case USB_DT_DEBUG:
	389	/* ignore silently */
	390	break;
	391
37fb59d3 GH	392	default:
	393	fprintf(stderr, "%s: %d unknown type %d (len %zd)\n", __FUNCTION__,
	394	dev->addr, type, len);
	395	break;
	396	}
	397
	398	if (ret > 0) {
	399	if (ret > len) {
	400	ret = len;
	401	}
	402	memcpy(dest, buf, ret);
	403	}
	404	return ret;
	405	}
	406
007fd62f HG	407	int usb_desc_handle_control(USBDevice dev, USBPacket p,
007fd62f HG	408	int request, int value, int index, int length, uint8_t *data)
37fb59d3 GH	409	{
37fb59d3 GH	410	const USBDesc *desc = dev->info->usb_desc;
a980a065	411	int i, ret = -1;
37fb59d3 GH	412
	413	assert(desc != NULL);
	414	switch(request) {
41c6abbd GH	415	case DeviceOutRequest \| USB_REQ_SET_ADDRESS:
	416	dev->addr = value;
	417	trace_usb_set_addr(dev->addr);
	418	ret = 0;
	419	break;
	420
37fb59d3 GH	421	case DeviceRequest \| USB_REQ_GET_DESCRIPTOR:
	422	ret = usb_desc_get_descriptor(dev, value, data, length);
	423	break;
a980a065 GH	424
	425	case DeviceRequest \| USB_REQ_GET_CONFIGURATION:
	426	data[0] = dev->config->bConfigurationValue;
	427	ret = 1;
	428	break;
	429	case DeviceOutRequest \| USB_REQ_SET_CONFIGURATION:
	430	for (i = 0; i < dev->device->bNumConfigurations; i++) {
	431	if (dev->device->confs[i].bConfigurationValue == value) {
	432	dev->config = dev->device->confs + i;
	433	ret = 0;
	434	}
	435	}
	436	trace_usb_set_config(dev->addr, value, ret);
	437	break;
ed5a83dd GH	438
	439	case DeviceRequest \| USB_REQ_GET_STATUS:
	440	data[0] = 0;
	441	if (dev->config->bmAttributes & 0x40) {
	442	data[0] \|= 1 << USB_DEVICE_SELF_POWERED;
	443	}
	444	if (dev->remote_wakeup) {
	445	data[0] \|= 1 << USB_DEVICE_REMOTE_WAKEUP;
	446	}
	447	data[1] = 0x00;
	448	ret = 2;
	449	break;
	450	case DeviceOutRequest \| USB_REQ_CLEAR_FEATURE:
	451	if (value == USB_DEVICE_REMOTE_WAKEUP) {
	452	dev->remote_wakeup = 0;
	453	ret = 0;
	454	}
	455	trace_usb_clear_device_feature(dev->addr, value, ret);
	456	break;
	457	case DeviceOutRequest \| USB_REQ_SET_FEATURE:
	458	if (value == USB_DEVICE_REMOTE_WAKEUP) {
	459	dev->remote_wakeup = 1;
	460	ret = 0;
	461	}
	462	trace_usb_set_device_feature(dev->addr, value, ret);
	463	break;
37fb59d3 GH	464	}
	465	return ret;
	466	}