/* * 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){#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);}#elsevoid 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