Archipelago » qemu

/*

 * QEMU USB HUB emulation

 *

 * Copyright (c) 2005 Fabrice Bellard

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "qemu-common.h"

#include "trace.h"

#include "hw/usb.h"

#include "hw/usb/desc.h"

#define NUM_PORTS 8

typedef struct USBHubPort {

    USBPort port;

    uint16_t wPortStatus;

    uint16_t wPortChange;

} USBHubPort;

typedef struct USBHubState {

    USBDevice dev;

    USBEndpoint *intr;

    USBHubPort ports[NUM_PORTS];

} USBHubState;

#define ClearHubFeature                (0x2000 | USB_REQ_CLEAR_FEATURE)

#define ClearPortFeature        (0x2300 | USB_REQ_CLEAR_FEATURE)

#define GetHubDescriptor        (0xa000 | USB_REQ_GET_DESCRIPTOR)

#define GetHubStatus                (0xa000 | USB_REQ_GET_STATUS)

#define GetPortStatus                (0xa300 | USB_REQ_GET_STATUS)

#define SetHubFeature                (0x2000 | USB_REQ_SET_FEATURE)

#define SetPortFeature                (0x2300 | USB_REQ_SET_FEATURE)

#define PORT_STAT_CONNECTION        0x0001

#define PORT_STAT_ENABLE        0x0002

#define PORT_STAT_SUSPEND        0x0004

#define PORT_STAT_OVERCURRENT        0x0008

#define PORT_STAT_RESET                0x0010

#define PORT_STAT_POWER                0x0100

#define PORT_STAT_LOW_SPEED        0x0200

#define PORT_STAT_HIGH_SPEED    0x0400

#define PORT_STAT_TEST          0x0800

#define PORT_STAT_INDICATOR     0x1000

#define PORT_STAT_C_CONNECTION        0x0001

#define PORT_STAT_C_ENABLE        0x0002

#define PORT_STAT_C_SUSPEND        0x0004

#define PORT_STAT_C_OVERCURRENT        0x0008

#define PORT_STAT_C_RESET        0x0010

#define PORT_CONNECTION                0

#define PORT_ENABLE                1

#define PORT_SUSPEND                2

#define PORT_OVERCURRENT        3

#define PORT_RESET                4

#define PORT_POWER                8

#define PORT_LOWSPEED                9

#define PORT_HIGHSPEED                10

#define PORT_C_CONNECTION        16

#define PORT_C_ENABLE                17

#define PORT_C_SUSPEND                18

#define PORT_C_OVERCURRENT        19

#define PORT_C_RESET                20

#define PORT_TEST               21

#define PORT_INDICATOR          22

/* same as Linux kernel root hubs */

enum {

    STR_MANUFACTURER = 1,

    STR_PRODUCT,

    STR_SERIALNUMBER,

};

static const USBDescStrings desc_strings = {

    [STR_MANUFACTURER] = "QEMU",

    [STR_PRODUCT]      = "QEMU USB Hub",

    [STR_SERIALNUMBER] = "314159",

};

static const USBDescIface desc_iface_hub = {

    .bInterfaceNumber              = 0,

    .bNumEndpoints                 = 1,

    .bInterfaceClass               = USB_CLASS_HUB,

    .eps = (USBDescEndpoint[]) {

        {

            .bEndpointAddress      = USB_DIR_IN | 0x01,

            .bmAttributes          = USB_ENDPOINT_XFER_INT,

            .wMaxPacketSize        = 1 + (NUM_PORTS + 7) / 8,

            .bInterval             = 0xff,

        },

    }

};

static const USBDescDevice desc_device_hub = {

    .bcdUSB                        = 0x0110,

    .bDeviceClass                  = USB_CLASS_HUB,

    .bMaxPacketSize0               = 8,

    .bNumConfigurations            = 1,

    .confs = (USBDescConfig[]) {

        {

            .bNumInterfaces        = 1,

            .bConfigurationValue   = 1,

            .bmAttributes          = 0xe0,

            .nif = 1,

            .ifs = &desc_iface_hub,

        },

    },

};

static const USBDesc desc_hub = {

    .id = {

        .idVendor          = 0x0409,

        .idProduct         = 0x55aa,

        .bcdDevice         = 0x0101,

        .iManufacturer     = STR_MANUFACTURER,

        .iProduct          = STR_PRODUCT,

        .iSerialNumber     = STR_SERIALNUMBER,

    },

    .full = &desc_device_hub,

    .str  = desc_strings,

};

static const uint8_t qemu_hub_hub_descriptor[] =

{

        0x00,                        /*  u8  bLength; patched in later */

        0x29,                        /*  u8  bDescriptorType; Hub-descriptor */

        0x00,                        /*  u8  bNbrPorts; (patched later) */

        0x0a,                        /* u16  wHubCharacteristics; */

        0x00,                        /*   (per-port OC, no power switching) */

        0x01,                        /*  u8  bPwrOn2pwrGood; 2ms */

        0x00                        /*  u8  bHubContrCurrent; 0 mA */

        /* DeviceRemovable and PortPwrCtrlMask patched in later */

};

static void usb_hub_attach(USBPort *port1)

{

    USBHubState *s = port1->opaque;

    USBHubPort *port = &s->ports[port1->index];

    trace_usb_hub_attach(s->dev.addr, port1->index + 1);

    port->wPortStatus |= PORT_STAT_CONNECTION;

    port->wPortChange |= PORT_STAT_C_CONNECTION;

    if (port->port.dev->speed == USB_SPEED_LOW) {

        port->wPortStatus |= PORT_STAT_LOW_SPEED;

    } else {

        port->wPortStatus &= ~PORT_STAT_LOW_SPEED;

    }

    usb_wakeup(s->intr, 0);

}

static void usb_hub_detach(USBPort *port1)

{

    USBHubState *s = port1->opaque;

    USBHubPort *port = &s->ports[port1->index];

    trace_usb_hub_detach(s->dev.addr, port1->index + 1);

    usb_wakeup(s->intr, 0);

    /* Let upstream know the device on this port is gone */

    s->dev.port->ops->child_detach(s->dev.port, port1->dev);

    port->wPortStatus &= ~PORT_STAT_CONNECTION;

    port->wPortChange |= PORT_STAT_C_CONNECTION;

    if (port->wPortStatus & PORT_STAT_ENABLE) {

        port->wPortStatus &= ~PORT_STAT_ENABLE;

        port->wPortChange |= PORT_STAT_C_ENABLE;

    }

    usb_wakeup(s->intr, 0);

}

static void usb_hub_child_detach(USBPort *port1, USBDevice *child)

{

    USBHubState *s = port1->opaque;

    /* Pass along upstream */

    s->dev.port->ops->child_detach(s->dev.port, child);

}

static void usb_hub_wakeup(USBPort *port1)

{

    USBHubState *s = port1->opaque;

    USBHubPort *port = &s->ports[port1->index];

    if (port->wPortStatus & PORT_STAT_SUSPEND) {

        port->wPortChange |= PORT_STAT_C_SUSPEND;

        usb_wakeup(s->intr, 0);

    }

}

static void usb_hub_complete(USBPort *port, USBPacket *packet)

{

    USBHubState *s = port->opaque;

    /*

     * Just pass it along upstream for now.

     *

     * If we ever implement usb 2.0 split transactions this will

     * become a little more complicated ...

     *

     * Can't use usb_packet_complete() here because packet->owner is

     * cleared already, go call the ->complete() callback directly

     * instead.

     */

    s->dev.port->ops->complete(s->dev.port, packet);

}

static USBDevice *usb_hub_find_device(USBDevice *dev, uint8_t addr)

{

    USBHubState *s = DO_UPCAST(USBHubState, dev, dev);

    USBHubPort *port;

    USBDevice *downstream;

    int i;

    for (i = 0; i < NUM_PORTS; i++) {

        port = &s->ports[i];

        if (!(port->wPortStatus & PORT_STAT_ENABLE)) {

            continue;

        }

        downstream = usb_find_device(&port->port, addr);

        if (downstream != NULL) {

            return downstream;

        }

    }

    return NULL;

}

static void usb_hub_handle_reset(USBDevice *dev)

{

    USBHubState *s = DO_UPCAST(USBHubState, dev, dev);

    USBHubPort *port;

    int i;

    trace_usb_hub_reset(s->dev.addr);

    for (i = 0; i < NUM_PORTS; i++) {

        port = s->ports + i;

        port->wPortStatus = PORT_STAT_POWER;

        port->wPortChange = 0;

        if (port->port.dev && port->port.dev->attached) {

            port->wPortStatus |= PORT_STAT_CONNECTION;

            port->wPortChange |= PORT_STAT_C_CONNECTION;

            if (port->port.dev->speed == USB_SPEED_LOW) {

                port->wPortStatus |= PORT_STAT_LOW_SPEED;

            }

        }

    }

}

static const char *feature_name(int feature)

{

    static const char *name[] = {

        [PORT_CONNECTION]    = "connection",

        [PORT_ENABLE]        = "enable",

        [PORT_SUSPEND]       = "suspend",

        [PORT_OVERCURRENT]   = "overcurrent",

        [PORT_RESET]         = "reset",

        [PORT_POWER]         = "power",

        [PORT_LOWSPEED]      = "lowspeed",

        [PORT_HIGHSPEED]     = "highspeed",

        [PORT_C_CONNECTION]  = "change connection",

        [PORT_C_ENABLE]      = "change enable",

        [PORT_C_SUSPEND]     = "change suspend",

        [PORT_C_OVERCURRENT] = "change overcurrent",

        [PORT_C_RESET]       = "change reset",

        [PORT_TEST]          = "test",

        [PORT_INDICATOR]     = "indicator",

    };

    if (feature < 0 || feature >= ARRAY_SIZE(name)) {

        return "?";

    }

    return name[feature] ?: "?";

}

static void usb_hub_handle_control(USBDevice *dev, USBPacket *p,

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

{

    USBHubState *s = (USBHubState *)dev;

    int ret;

    trace_usb_hub_control(s->dev.addr, request, value, index, length);

    ret = usb_desc_handle_control(dev, p, request, value, index, length, data);

    if (ret >= 0) {

        return;

    }

    switch(request) {

    case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:

        if (value == 0 && index != 0x81) { /* clear ep halt */

            goto fail;

        }

        break;

        /* usb specific requests */

    case GetHubStatus:

        data[0] = 0;

        data[1] = 0;

        data[2] = 0;

        data[3] = 0;

        p->actual_length = 4;

        break;

    case GetPortStatus:

        {

            unsigned int n = index - 1;

            USBHubPort *port;

            if (n >= NUM_PORTS) {

                goto fail;

            }

            port = &s->ports[n];

            trace_usb_hub_get_port_status(s->dev.addr, index,

                                          port->wPortStatus,

                                          port->wPortChange);

            data[0] = port->wPortStatus;

            data[1] = port->wPortStatus >> 8;

            data[2] = port->wPortChange;

            data[3] = port->wPortChange >> 8;

            p->actual_length = 4;

        }

        break;

    case SetHubFeature:

    case ClearHubFeature:

        if (value != 0 && value != 1) {

            goto fail;

        }

        break;

    case SetPortFeature:

        {

            unsigned int n = index - 1;

            USBHubPort *port;

            USBDevice *dev;

            trace_usb_hub_set_port_feature(s->dev.addr, index,

                                           feature_name(value));

            if (n >= NUM_PORTS) {

                goto fail;

            }

            port = &s->ports[n];

            dev = port->port.dev;

            switch(value) {

            case PORT_SUSPEND:

                port->wPortStatus |= PORT_STAT_SUSPEND;

                break;

            case PORT_RESET:

                if (dev && dev->attached) {

                    usb_device_reset(dev);

                    port->wPortChange |= PORT_STAT_C_RESET;

                    /* set enable bit */

                    port->wPortStatus |= PORT_STAT_ENABLE;

                    usb_wakeup(s->intr, 0);

                }

                break;

            case PORT_POWER:

                break;

            default:

                goto fail;

            }

        }

        break;

    case ClearPortFeature:

        {

            unsigned int n = index - 1;

            USBHubPort *port;

            trace_usb_hub_clear_port_feature(s->dev.addr, index,

                                             feature_name(value));

            if (n >= NUM_PORTS) {

                goto fail;

            }

            port = &s->ports[n];

            switch(value) {

            case PORT_ENABLE:

                port->wPortStatus &= ~PORT_STAT_ENABLE;

                break;

            case PORT_C_ENABLE:

                port->wPortChange &= ~PORT_STAT_C_ENABLE;

                break;

            case PORT_SUSPEND:

                port->wPortStatus &= ~PORT_STAT_SUSPEND;

                break;

            case PORT_C_SUSPEND:

                port->wPortChange &= ~PORT_STAT_C_SUSPEND;

                break;

            case PORT_C_CONNECTION:

                port->wPortChange &= ~PORT_STAT_C_CONNECTION;

                break;

            case PORT_C_OVERCURRENT:

                port->wPortChange &= ~PORT_STAT_C_OVERCURRENT;

                break;

            case PORT_C_RESET:

                port->wPortChange &= ~PORT_STAT_C_RESET;

                break;

            default:

                goto fail;

            }

        }

        break;

    case GetHubDescriptor:

        {

            unsigned int n, limit, var_hub_size = 0;

            memcpy(data, qemu_hub_hub_descriptor,

                   sizeof(qemu_hub_hub_descriptor));

            data[2] = NUM_PORTS;

            /* fill DeviceRemovable bits */

            limit = ((NUM_PORTS + 1 + 7) / 8) + 7;

            for (n = 7; n < limit; n++) {

                data[n] = 0x00;

                var_hub_size++;

            }

            /* fill PortPwrCtrlMask bits */

            limit = limit + ((NUM_PORTS + 7) / 8);

            for (;n < limit; n++) {

                data[n] = 0xff;

                var_hub_size++;

            }

            p->actual_length = sizeof(qemu_hub_hub_descriptor) + var_hub_size;

            data[0] = p->actual_length;

            break;

        }

    default:

    fail:

        p->status = USB_RET_STALL;

        break;

    }

}

static void usb_hub_handle_data(USBDevice *dev, USBPacket *p)

{

    USBHubState *s = (USBHubState *)dev;

    switch(p->pid) {

    case USB_TOKEN_IN:

        if (p->ep->nr == 1) {

            USBHubPort *port;

            unsigned int status;

            uint8_t buf[4];

            int i, n;

            n = (NUM_PORTS + 1 + 7) / 8;

            if (p->iov.size == 1) { /* FreeBSD workaround */

                n = 1;

            } else if (n > p->iov.size) {

                p->status = USB_RET_BABBLE;

                return;

            }

            status = 0;

            for(i = 0; i < NUM_PORTS; i++) {

                port = &s->ports[i];

                if (port->wPortChange)

                    status |= (1 << (i + 1));

            }

            if (status != 0) {

                for(i = 0; i < n; i++) {

                    buf[i] = status >> (8 * i);

                }

                usb_packet_copy(p, buf, n);

            } else {

                p->status = USB_RET_NAK; /* usb11 11.13.1 */

            }

        } else {

            goto fail;

        }

        break;

    case USB_TOKEN_OUT:

    default:

    fail:

        p->status = USB_RET_STALL;

        break;

    }

}

static void usb_hub_handle_destroy(USBDevice *dev)

{

    USBHubState *s = (USBHubState *)dev;

    int i;

    for (i = 0; i < NUM_PORTS; i++) {

        usb_unregister_port(usb_bus_from_device(dev),

                            &s->ports[i].port);

    }

}

static USBPortOps usb_hub_port_ops = {

    .attach = usb_hub_attach,

    .detach = usb_hub_detach,

    .child_detach = usb_hub_child_detach,

    .wakeup = usb_hub_wakeup,

    .complete = usb_hub_complete,

};

static int usb_hub_initfn(USBDevice *dev)

{

    USBHubState *s = DO_UPCAST(USBHubState, dev, dev);

    USBHubPort *port;

    int i;

    usb_desc_create_serial(dev);

    usb_desc_init(dev);

    s->intr = usb_ep_get(dev, USB_TOKEN_IN, 1);

    for (i = 0; i < NUM_PORTS; i++) {

        port = &s->ports[i];

        usb_register_port(usb_bus_from_device(dev),

                          &port->port, s, i, &usb_hub_port_ops,

                          USB_SPEED_MASK_LOW | USB_SPEED_MASK_FULL);

        usb_port_location(&port->port, dev->port, i+1);

    }

    usb_hub_handle_reset(dev);

    return 0;

}

static const VMStateDescription vmstate_usb_hub_port = {

    .name = "usb-hub-port",

    .version_id = 1,

    .minimum_version_id = 1,

    .fields = (VMStateField []) {

        VMSTATE_UINT16(wPortStatus, USBHubPort),

        VMSTATE_UINT16(wPortChange, USBHubPort),

        VMSTATE_END_OF_LIST()

    }

};

static const VMStateDescription vmstate_usb_hub = {

    .name = "usb-hub",

    .version_id = 1,

    .minimum_version_id = 1,

    .fields = (VMStateField []) {

        VMSTATE_USB_DEVICE(dev, USBHubState),

        VMSTATE_STRUCT_ARRAY(ports, USBHubState, NUM_PORTS, 0,

                             vmstate_usb_hub_port, USBHubPort),

        VMSTATE_END_OF_LIST()

    }

};

static void usb_hub_class_initfn(ObjectClass *klass, void *data)

{

    DeviceClass *dc = DEVICE_CLASS(klass);

    USBDeviceClass *uc = USB_DEVICE_CLASS(klass);

    uc->init           = usb_hub_initfn;

    uc->product_desc   = "QEMU USB Hub";

    uc->usb_desc       = &desc_hub;

    uc->find_device    = usb_hub_find_device;

    uc->handle_reset   = usb_hub_handle_reset;

    uc->handle_control = usb_hub_handle_control;

    uc->handle_data    = usb_hub_handle_data;

    uc->handle_destroy = usb_hub_handle_destroy;

    dc->fw_name = "hub";

    dc->vmsd = &vmstate_usb_hub;

}

static const TypeInfo hub_info = {

    .name          = "usb-hub",

    .parent        = TYPE_USB_DEVICE,

    .instance_size = sizeof(USBHubState),

    .class_init    = usb_hub_class_initfn,

};

static void usb_hub_register_types(void)

{

    type_register_static(&hub_info);

}

type_init(usb_hub_register_types)