File:  [Qemu by Fabrice Bellard] / qemu / bt-vhci.c
Revision 1.1.1.1 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 16:50:49 2018 UTC (3 years, 3 months ago) by root
Branches: qemu, MAIN
CVS tags: qemu0105, qemu0104, qemu0103, qemu0102, qemu0101, qemu0100, HEAD
qemu 0.10.0

    1: /*
    2:  * Support for host VHCIs inside qemu scatternets.
    3:  *
    4:  * Copyright (C) 2008 Andrzej Zaborowski  <balrog@zabor.org>
    5:  *
    6:  * This program is free software; you can redistribute it and/or
    7:  * modify it under the terms of the GNU General Public License as
    8:  * published by the Free Software Foundation; either version 2 or
    9:  * (at your option) version 3 of the License.
   10:  *
   11:  * This program is distributed in the hope that it will be useful,
   12:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   13:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   14:  * GNU General Public License for more details.
   15:  *
   16:  * You should have received a copy of the GNU General Public License along
   17:  * with this program; if not, write to the Free Software Foundation, Inc.,
   18:  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
   19:  */
   20: 
   21: #include "qemu-common.h"
   22: #include "qemu-char.h"
   23: #include "sysemu.h"
   24: #include "net.h"
   25: #include "hw/bt.h"
   26: 
   27: #define VHCI_DEV	"/dev/vhci"
   28: #define VHCI_UDEV	"/dev/hci_vhci"
   29: 
   30: struct bt_vhci_s {
   31:     int fd;
   32:     struct HCIInfo *info;
   33: 
   34:     uint8_t hdr[4096];
   35:     int len;
   36: };
   37: 
   38: static void vhci_read(void *opaque)
   39: {
   40:     struct bt_vhci_s *s = (struct bt_vhci_s *) opaque;
   41:     uint8_t *pkt;
   42:     int pktlen;
   43: 
   44:     /* Seems that we can't read only the header first and then the amount
   45:      * of data indicated in the header because Linux will discard everything
   46:      * that's not been read in one go.  */
   47:     s->len = read(s->fd, s->hdr, sizeof(s->hdr));
   48: 
   49:     if (s->len < 0) {
   50:         fprintf(stderr, "qemu: error %i reading the PDU\n", errno);
   51:         return;
   52:     }
   53: 
   54:     pkt = s->hdr;
   55:     while (s->len --)
   56:         switch (*pkt ++) {
   57:         case HCI_COMMAND_PKT:
   58:             if (s->len < 3)
   59:                 goto bad_pkt;
   60: 
   61:             pktlen = MIN(pkt[2] + 3, s->len);
   62:             s->info->cmd_send(s->info, pkt, pktlen);
   63:             s->len -= pktlen;
   64:             pkt += pktlen;
   65:             break;
   66: 
   67:         case HCI_ACLDATA_PKT:
   68:             if (s->len < 4)
   69:                 goto bad_pkt;
   70: 
   71:             pktlen = MIN(((pkt[3] << 8) | pkt[2]) + 4, s->len);
   72:             s->info->acl_send(s->info, pkt, pktlen);
   73:             s->len -= pktlen;
   74:             pkt += pktlen;
   75:             break;
   76: 
   77:         case HCI_SCODATA_PKT:
   78:             if (s->len < 3)
   79:                 goto bad_pkt;
   80: 
   81:             pktlen = MIN(pkt[2] + 3, s->len);
   82:             s->info->sco_send(s->info, pkt, pktlen);
   83:             s->len -= pktlen;
   84:             pkt += pktlen;
   85:             break;
   86: 
   87:         default:
   88:         bad_pkt:
   89:             fprintf(stderr, "qemu: bad HCI packet type %02x\n", pkt[-1]);
   90:         }
   91: }
   92: 
   93: static void vhci_host_send(void *opaque,
   94:                 int type, const uint8_t *data, int len)
   95: {
   96:     struct bt_vhci_s *s = (struct bt_vhci_s *) opaque;
   97: #if 0
   98:     uint8_t pkt = type;
   99:     struct iovec iv[2];
  100: 
  101:     iv[0].iov_base = &pkt;
  102:     iv[0].iov_len  = 1;
  103:     iv[1].iov_base = (void *) data;
  104:     iv[1].iov_len  = len;
  105: 
  106:     while (writev(s->fd, iv, 2) < 0)
  107:         if (errno != EAGAIN && errno != EINTR) {
  108:             fprintf(stderr, "qemu: error %i writing bluetooth packet.\n",
  109:                             errno);
  110:             return;
  111:         }
  112: #else
  113:     /* Apparently VHCI wants us to write everything in one chunk :-(  */
  114:     static uint8_t buf[4096];
  115: 
  116:     buf[0] = type;
  117:     memcpy(buf + 1, data, len);
  118: 
  119:     while (write(s->fd, buf, len + 1) < 0)
  120:         if (errno != EAGAIN && errno != EINTR) {
  121:             fprintf(stderr, "qemu: error %i writing bluetooth packet.\n",
  122:                             errno);
  123:             return;
  124:         }
  125: #endif
  126: }
  127: 
  128: static void vhci_out_hci_packet_event(void *opaque,
  129:                 const uint8_t *data, int len)
  130: {
  131:     vhci_host_send(opaque, HCI_EVENT_PKT, data, len);
  132: }
  133: 
  134: static void vhci_out_hci_packet_acl(void *opaque,
  135:                 const uint8_t *data, int len)
  136: {
  137:     vhci_host_send(opaque, HCI_ACLDATA_PKT, data, len);
  138: }
  139: 
  140: void bt_vhci_init(struct HCIInfo *info)
  141: {
  142:     struct bt_vhci_s *s;
  143:     int err[2];
  144:     int fd;
  145: 
  146:     fd = open(VHCI_DEV, O_RDWR);
  147:     err[0] = errno;
  148:     if (fd < 0) {
  149:         fd = open(VHCI_UDEV, O_RDWR);
  150:         err[1] = errno;
  151:     }
  152: 
  153:     if (fd < 0) {
  154:         fprintf(stderr, "qemu: Can't open `%s': %s (%i)\n",
  155:                         VHCI_DEV, strerror(err[0]), err[0]);
  156:         fprintf(stderr, "qemu: Can't open `%s': %s (%i)\n",
  157:                         VHCI_UDEV, strerror(err[1]), err[1]);
  158:         exit(-1);
  159:     }
  160: 
  161:     s = qemu_mallocz(sizeof(struct bt_vhci_s));
  162:     s->fd = fd;
  163:     s->info = info ?: qemu_next_hci();
  164:     s->info->opaque = s;
  165:     s->info->evt_recv = vhci_out_hci_packet_event;
  166:     s->info->acl_recv = vhci_out_hci_packet_acl;
  167: 
  168:     qemu_set_fd_handler(s->fd, vhci_read, 0, s);
  169: }

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