310 lines
7.8 KiB
C
310 lines
7.8 KiB
C
/*
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* Linux host USB redirector
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*
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* Copyright (c) 2005 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "vl.h"
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#if defined(__linux__)
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#include <dirent.h>
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#include <sys/ioctl.h>
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#include <linux/usbdevice_fs.h>
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#include <linux/version.h>
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/* We redefine it to avoid version problems */
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struct usb_ctrltransfer {
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uint8_t bRequestType;
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uint8_t bRequest;
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uint16_t wValue;
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uint16_t wIndex;
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uint16_t wLength;
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uint32_t timeout;
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void *data;
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};
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//#define DEBUG
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#define MAX_DEVICES 8
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#define USBDEVFS_PATH "/proc/bus/usb"
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typedef struct USBHostDevice {
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USBDevice dev;
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int fd;
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} USBHostDevice;
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typedef struct USBHostHubState {
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USBDevice *hub_dev;
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USBPort *hub_ports[MAX_DEVICES];
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USBDevice *hub_devices[MAX_DEVICES];
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} USBHostHubState;
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static void usb_host_handle_reset(USBDevice *dev)
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{
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#if 0
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USBHostDevice *s = (USBHostDevice *)dev;
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/* USBDEVFS_RESET, but not the first time as it has already be
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done by the host OS */
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ioctl(s->fd, USBDEVFS_RESET);
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#endif
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}
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static int usb_host_handle_control(USBDevice *dev,
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int request,
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int value,
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int index,
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int length,
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uint8_t *data)
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{
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USBHostDevice *s = (USBHostDevice *)dev;
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struct usb_ctrltransfer ct;
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int ret;
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if (request == (DeviceOutRequest | USB_REQ_SET_ADDRESS)) {
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/* specific SET_ADDRESS support */
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dev->addr = value;
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return 0;
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} else {
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ct.bRequestType = request >> 8;
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ct.bRequest = request;
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ct.wValue = value;
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ct.wIndex = index;
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ct.wLength = length;
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ct.timeout = 50;
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ct.data = data;
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ret = ioctl(s->fd, USBDEVFS_CONTROL, &ct);
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if (ret < 0) {
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switch(errno) {
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case ETIMEDOUT:
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return USB_RET_NAK;
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default:
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return USB_RET_STALL;
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}
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} else {
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return ret;
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}
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}
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}
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static int usb_host_handle_data(USBDevice *dev, int pid,
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uint8_t devep,
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uint8_t *data, int len)
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{
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USBHostDevice *s = (USBHostDevice *)dev;
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struct usbdevfs_bulktransfer bt;
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int ret;
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/* XXX: optimize and handle all data types by looking at the
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config descriptor */
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if (pid == USB_TOKEN_IN)
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devep |= 0x80;
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bt.ep = devep;
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bt.len = len;
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bt.timeout = 50;
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bt.data = data;
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ret = ioctl(s->fd, USBDEVFS_BULK, &bt);
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if (ret < 0) {
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switch(errno) {
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case ETIMEDOUT:
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return USB_RET_NAK;
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case EPIPE:
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default:
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#ifdef DEBUG
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printf("handle_data: errno=%d\n", errno);
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#endif
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return USB_RET_STALL;
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}
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} else {
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return ret;
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}
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}
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static int usb_host_handle_packet(USBDevice *dev, int pid,
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uint8_t devaddr, uint8_t devep,
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uint8_t *data, int len)
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{
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return usb_generic_handle_packet(dev, pid, devaddr, devep, data, len);
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}
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/* XXX: exclude high speed devices or implement EHCI */
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static void scan_host_device(USBHostHubState *s, const char *filename)
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{
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int fd, interface, ret, i;
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USBHostDevice *dev;
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struct usbdevfs_connectinfo ci;
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uint8_t descr[1024];
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int descr_len, dev_descr_len, config_descr_len, nb_interfaces;
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#ifdef DEBUG
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printf("scanning %s\n", filename);
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#endif
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fd = open(filename, O_RDWR);
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if (fd < 0) {
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perror(filename);
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return;
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}
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/* read the config description */
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descr_len = read(fd, descr, sizeof(descr));
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if (descr_len <= 0) {
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perror("read descr");
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goto fail;
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}
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i = 0;
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dev_descr_len = descr[0];
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if (dev_descr_len > descr_len)
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goto fail;
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i += dev_descr_len;
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config_descr_len = descr[i];
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if (i + config_descr_len > descr_len)
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goto fail;
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nb_interfaces = descr[i + 4];
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if (nb_interfaces != 1) {
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/* NOTE: currently we grab only one interface */
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goto fail;
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}
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/* XXX: only grab if all interfaces are free */
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interface = 0;
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ret = ioctl(fd, USBDEVFS_CLAIMINTERFACE, &interface);
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if (ret < 0) {
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if (errno == EBUSY) {
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#ifdef DEBUG
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printf("%s already grabbed\n", filename);
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#endif
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} else {
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perror("USBDEVFS_CLAIMINTERFACE");
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}
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fail:
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close(fd);
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return;
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}
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ret = ioctl(fd, USBDEVFS_CONNECTINFO, &ci);
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if (ret < 0) {
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perror("USBDEVFS_CONNECTINFO");
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goto fail;
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}
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#ifdef DEBUG
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printf("%s grabbed\n", filename);
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#endif
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/* find a free slot */
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for(i = 0; i < MAX_DEVICES; i++) {
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if (!s->hub_devices[i])
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break;
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}
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if (i == MAX_DEVICES) {
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#ifdef DEBUG
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printf("too many host devices\n");
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goto fail;
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#endif
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}
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dev = qemu_mallocz(sizeof(USBHostDevice));
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if (!dev)
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goto fail;
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dev->fd = fd;
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if (ci.slow)
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dev->dev.speed = USB_SPEED_LOW;
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else
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dev->dev.speed = USB_SPEED_HIGH;
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dev->dev.handle_packet = usb_host_handle_packet;
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dev->dev.handle_reset = usb_host_handle_reset;
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dev->dev.handle_control = usb_host_handle_control;
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dev->dev.handle_data = usb_host_handle_data;
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s->hub_devices[i] = (USBDevice *)dev;
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/* activate device on hub */
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usb_attach(s->hub_ports[i], s->hub_devices[i]);
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}
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static void scan_host_devices(USBHostHubState *s, const char *bus_path)
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{
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DIR *d;
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struct dirent *de;
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char buf[1024];
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d = opendir(bus_path);
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if (!d)
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return;
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for(;;) {
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de = readdir(d);
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if (!de)
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break;
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if (de->d_name[0] != '.') {
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snprintf(buf, sizeof(buf), "%s/%s", bus_path, de->d_name);
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scan_host_device(s, buf);
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}
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}
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closedir(d);
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}
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static void scan_host_buses(USBHostHubState *s)
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{
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DIR *d;
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struct dirent *de;
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char buf[1024];
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d = opendir(USBDEVFS_PATH);
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if (!d)
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return;
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for(;;) {
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de = readdir(d);
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if (!de)
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break;
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if (isdigit(de->d_name[0])) {
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snprintf(buf, sizeof(buf), "%s/%s", USBDEVFS_PATH, de->d_name);
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scan_host_devices(s, buf);
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}
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}
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closedir(d);
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}
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/* virtual hub containing the USB devices of the host */
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USBDevice *usb_host_hub_init(void)
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{
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USBHostHubState *s;
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s = qemu_mallocz(sizeof(USBHostHubState));
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if (!s)
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return NULL;
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s->hub_dev = usb_hub_init(s->hub_ports, MAX_DEVICES);
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if (!s->hub_dev) {
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free(s);
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return NULL;
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}
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scan_host_buses(s);
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return s->hub_dev;
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}
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#else
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/* XXX: modify configure to compile the right host driver */
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USBDevice *usb_host_hub_init(void)
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{
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return NULL;
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}
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#endif
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