Archipelago » qemu

/*

 * Linux host USB redirector

 *

 * 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 "vl.h"

#if defined(__linux__)

#include <dirent.h>

#include <sys/ioctl.h>

#include <linux/usbdevice_fs.h>

#include <linux/version.h>

/* We redefine it to avoid version problems */

struct usb_ctrltransfer {

    uint8_t  bRequestType;

    uint8_t  bRequest;

    uint16_t wValue;

    uint16_t wIndex;

    uint16_t wLength;

    uint32_t timeout;

    void *data;

};

typedef int USBScanFunc(void *opaque, int bus_num, int addr, int class_id,

                        int vendor_id, int product_id, 

                        const char *product_name, int speed);

static int usb_host_find_device(int *pbus_num, int *paddr, 

                                const char *devname);

//#define DEBUG

#define USBDEVFS_PATH "/proc/bus/usb"

typedef struct USBHostDevice {

    USBDevice dev;

    int fd;

} USBHostDevice;

static void usb_host_handle_reset(USBDevice *dev, int destroy)

{

#if 0

    USBHostDevice *s = (USBHostDevice *)dev;

    /* USBDEVFS_RESET, but not the first time as it has already be

       done by the host OS */

    ioctl(s->fd, USBDEVFS_RESET);

#endif

} 

static int usb_host_handle_control(USBDevice *dev,

                                   int request,

                                   int value,

                                   int index,

                                   int length,

                                   uint8_t *data)

{

    USBHostDevice *s = (USBHostDevice *)dev;

    struct usb_ctrltransfer ct;

    int ret;

    if (request == (DeviceOutRequest | USB_REQ_SET_ADDRESS)) {

        /* specific SET_ADDRESS support */

        dev->addr = value;

        return 0;

    } else {

        ct.bRequestType = request >> 8;

        ct.bRequest = request;

        ct.wValue = value;

        ct.wIndex = index;

        ct.wLength = length;

        ct.timeout = 50;

        ct.data = data;

        ret = ioctl(s->fd, USBDEVFS_CONTROL, &ct);

        if (ret < 0) {

            switch(errno) {

            case ETIMEDOUT:

                return USB_RET_NAK;

            default:

                return USB_RET_STALL;

            }

        } else {

            return ret;

        }

   }

}

static int usb_host_handle_data(USBDevice *dev, int pid, 

                                uint8_t devep,

                                uint8_t *data, int len)

{

    USBHostDevice *s = (USBHostDevice *)dev;

    struct usbdevfs_bulktransfer bt;

    int ret;

    /* XXX: optimize and handle all data types by looking at the

       config descriptor */

    if (pid == USB_TOKEN_IN)

        devep |= 0x80;

    bt.ep = devep;

    bt.len = len;

    bt.timeout = 50;

    bt.data = data;

    ret = ioctl(s->fd, USBDEVFS_BULK, &bt);

    if (ret < 0) {

        switch(errno) {

        case ETIMEDOUT:

            return USB_RET_NAK;

        case EPIPE:

        default:

#ifdef DEBUG

            printf("handle_data: errno=%d\n", errno);

#endif

            return USB_RET_STALL;

        }

    } else {

        return ret;

    }

}

/* XXX: exclude high speed devices or implement EHCI */

USBDevice *usb_host_device_open(const char *devname)

{

    int fd, interface, ret, i;

    USBHostDevice *dev;

    struct usbdevfs_connectinfo ci;

    uint8_t descr[1024];

    char buf[1024];

    int descr_len, dev_descr_len, config_descr_len, nb_interfaces;

    int bus_num, addr;

    if (usb_host_find_device(&bus_num, &addr, devname) < 0) 

        return NULL;

    snprintf(buf, sizeof(buf), USBDEVFS_PATH "/%03d/%03d", 

             bus_num, addr);

    fd = open(buf, O_RDWR);

    if (fd < 0) {

        perror(buf);

        return NULL;

    }

    /* read the config description */

    descr_len = read(fd, descr, sizeof(descr));

    if (descr_len <= 0) {

        perror("read descr");

        goto fail;

    }

    i = 0;

    dev_descr_len = descr[0];

    if (dev_descr_len > descr_len)

        goto fail;

    i += dev_descr_len;

    config_descr_len = descr[i];

    if (i + config_descr_len > descr_len)

        goto fail;

    nb_interfaces = descr[i + 4];

    if (nb_interfaces != 1) {

        /* NOTE: currently we grab only one interface */

        fprintf(stderr, "usb_host: only one interface supported\n");

        goto fail;

    }

#ifdef USBDEVFS_DISCONNECT

    /* earlier Linux 2.4 do not support that */

    {

        struct usbdevfs_ioctl ctrl;

        ctrl.ioctl_code = USBDEVFS_DISCONNECT;

        ctrl.ifno = 0;

        ret = ioctl(fd, USBDEVFS_IOCTL, &ctrl);

        if (ret < 0 && errno != ENODATA) {

            perror("USBDEVFS_DISCONNECT");

            goto fail;

        }

    }

#endif

    /* XXX: only grab if all interfaces are free */

    interface = 0;

    ret = ioctl(fd, USBDEVFS_CLAIMINTERFACE, &interface);

    if (ret < 0) {

        if (errno == EBUSY) {

            fprintf(stderr, "usb_host: device already grabbed\n");

        } else {

            perror("USBDEVFS_CLAIMINTERFACE");

        }

    fail:

        close(fd);

        return NULL;

    }

    ret = ioctl(fd, USBDEVFS_CONNECTINFO, &ci);

    if (ret < 0) {

        perror("USBDEVFS_CONNECTINFO");

        goto fail;

    }

#ifdef DEBUG

    printf("host USB device %d.%d grabbed\n", bus_num, addr);

#endif    

    dev = qemu_mallocz(sizeof(USBHostDevice));

    if (!dev)

        goto fail;

    dev->fd = fd;

    if (ci.slow)

        dev->dev.speed = USB_SPEED_LOW;

    else

        dev->dev.speed = USB_SPEED_HIGH;

    dev->dev.handle_packet = usb_generic_handle_packet;

    dev->dev.handle_reset = usb_host_handle_reset;

    dev->dev.handle_control = usb_host_handle_control;

    dev->dev.handle_data = usb_host_handle_data;

    return (USBDevice *)dev;

}

static int get_tag_value(char *buf, int buf_size,

                         const char *str, const char *tag, 

                         const char *stopchars)

{

    const char *p;

    char *q;

    p = strstr(str, tag);

    if (!p)

        return -1;

    p += strlen(tag);

    while (isspace(*p))

        p++;

    q = buf;

    while (*p != '\0' && !strchr(stopchars, *p)) {

        if ((q - buf) < (buf_size - 1))

            *q++ = *p;

        p++;

    }

    *q = '\0';

    return q - buf;

}

static int usb_host_scan(void *opaque, USBScanFunc *func)

{

    FILE *f;

    char line[1024];

    char buf[1024];

    int bus_num, addr, speed, device_count, class_id, product_id, vendor_id;

    int ret;

    char product_name[512];

    f = fopen(USBDEVFS_PATH "/devices", "r");

    if (!f) {

        term_printf("Could not open %s\n", USBDEVFS_PATH "/devices");

        return 0;

    }

    device_count = 0;

    bus_num = addr = speed = class_id = product_id = vendor_id = 0;

    ret = 0;

    for(;;) {

        if (fgets(line, sizeof(line), f) == NULL)

            break;

        if (strlen(line) > 0)

            line[strlen(line) - 1] = '\0';

        if (line[0] == 'T' && line[1] == ':') {

            if (device_count && (vendor_id || product_id)) {

                /* New device.  Add the previously discovered device.  */

                ret = func(opaque, bus_num, addr, class_id, vendor_id, 

                           product_id, product_name, speed);

                if (ret)

                    goto the_end;

            }

            if (get_tag_value(buf, sizeof(buf), line, "Bus=", " ") < 0)

                goto fail;

            bus_num = atoi(buf);

            if (get_tag_value(buf, sizeof(buf), line, "Dev#=", " ") < 0)

                goto fail;

            addr = atoi(buf);

            if (get_tag_value(buf, sizeof(buf), line, "Spd=", " ") < 0)

                goto fail;

            if (!strcmp(buf, "480"))

                speed = USB_SPEED_HIGH;

            else if (!strcmp(buf, "1.5"))

                speed = USB_SPEED_LOW;

            else

                speed = USB_SPEED_FULL;

            product_name[0] = '\0';

            class_id = 0xff;

            device_count++;

            product_id = 0;

            vendor_id = 0;

        } else if (line[0] == 'P' && line[1] == ':') {

            if (get_tag_value(buf, sizeof(buf), line, "Vendor=", " ") < 0)

                goto fail;

            vendor_id = strtoul(buf, NULL, 16);

            if (get_tag_value(buf, sizeof(buf), line, "ProdID=", " ") < 0)

                goto fail;

            product_id = strtoul(buf, NULL, 16);

        } else if (line[0] == 'S' && line[1] == ':') {

            if (get_tag_value(buf, sizeof(buf), line, "Product=", "") < 0)

                goto fail;

            pstrcpy(product_name, sizeof(product_name), buf);

        } else if (line[0] == 'D' && line[1] == ':') {

            if (get_tag_value(buf, sizeof(buf), line, "Cls=", " (") < 0)

                goto fail;

            class_id = strtoul(buf, NULL, 16);

        }

    fail: ;

    }

    if (device_count && (vendor_id || product_id)) {

        /* Add the last device.  */

        ret = func(opaque, bus_num, addr, class_id, vendor_id, 

                   product_id, product_name, speed);

    }

 the_end:

    fclose(f);

    return ret;

}

typedef struct FindDeviceState {

    int vendor_id;

    int product_id;

    int bus_num;

    int addr;

} FindDeviceState;

static int usb_host_find_device_scan(void *opaque, int bus_num, int addr, 

                                     int class_id,

                                     int vendor_id, int product_id, 

                                     const char *product_name, int speed)

{

    FindDeviceState *s = opaque;

    if (vendor_id == s->vendor_id &&

        product_id == s->product_id) {

        s->bus_num = bus_num;

        s->addr = addr;

        return 1;

    } else {

        return 0;

    }

}

/* the syntax is : 

   'bus.addr' (decimal numbers) or 

   'vendor_id:product_id' (hexa numbers) */

static int usb_host_find_device(int *pbus_num, int *paddr, 

                                const char *devname)

{

    const char *p;

    int ret;

    FindDeviceState fs;

    p = strchr(devname, '.');

    if (p) {

        *pbus_num = strtoul(devname, NULL, 0);

        *paddr = strtoul(p + 1, NULL, 0);

        return 0;

    }

    p = strchr(devname, ':');

    if (p) {

        fs.vendor_id = strtoul(devname, NULL, 16);

        fs.product_id = strtoul(p + 1, NULL, 16);

        ret = usb_host_scan(&fs, usb_host_find_device_scan);

        if (ret) {

            *pbus_num = fs.bus_num;

            *paddr = fs.addr;

            return 0;

        }

    }

    return -1;

}

/**********************/

/* USB host device info */

struct usb_class_info {

    int class;

    const char *class_name;

};

static const struct usb_class_info usb_class_info[] = {

    { USB_CLASS_AUDIO, "Audio"},

    { USB_CLASS_COMM, "Communication"},

    { USB_CLASS_HID, "HID"},

    { USB_CLASS_HUB, "Hub" },

    { USB_CLASS_PHYSICAL, "Physical" },

    { USB_CLASS_PRINTER, "Printer" },

    { USB_CLASS_MASS_STORAGE, "Storage" },

    { USB_CLASS_CDC_DATA, "Data" },

    { USB_CLASS_APP_SPEC, "Application Specific" },

    { USB_CLASS_VENDOR_SPEC, "Vendor Specific" },

    { USB_CLASS_STILL_IMAGE, "Still Image" },

    { USB_CLASS_CSCID,         "Smart Card" },

    { USB_CLASS_CONTENT_SEC, "Content Security" },

    { -1, NULL }

};

static const char *usb_class_str(uint8_t class)

{

    const struct usb_class_info *p;

    for(p = usb_class_info; p->class != -1; p++) {

        if (p->class == class)

            break;

    }

    return p->class_name;

}

void usb_info_device(int bus_num, int addr, int class_id,

                     int vendor_id, int product_id, 

                     const char *product_name,

                     int speed)

{

    const char *class_str, *speed_str;

    switch(speed) {

    case USB_SPEED_LOW: 

        speed_str = "1.5"; 

        break;

    case USB_SPEED_FULL: 

        speed_str = "12"; 

        break;

    case USB_SPEED_HIGH: 

        speed_str = "480"; 

        break;

    default:

        speed_str = "?"; 

        break;

    }

    term_printf("  Device %d.%d, speed %s Mb/s\n", 

                bus_num, addr, speed_str);

    class_str = usb_class_str(class_id);

    if (class_str) 

        term_printf("    %s:", class_str);

    else

        term_printf("    Class %02x:", class_id);

    term_printf(" USB device %04x:%04x", vendor_id, product_id);

    if (product_name[0] != '\0')

        term_printf(", %s", product_name);

    term_printf("\n");

}

static int usb_host_info_device(void *opaque, int bus_num, int addr, 

                                int class_id,

                                int vendor_id, int product_id, 

                                const char *product_name,

                                int speed)

{

    usb_info_device(bus_num, addr, class_id, vendor_id, product_id,

                    product_name, speed);

    return 0;

}

void usb_host_info(void)

{

    usb_host_scan(NULL, usb_host_info_device);

}

#else

void usb_host_info(void)

{

    term_printf("USB host devices not supported\n");

}

/* XXX: modify configure to compile the right host driver */

USBDevice *usb_host_device_open(const char *devname)

{

    return NULL;

}

#endif