File:  [Qemu by Fabrice Bellard] / qemu / bt-vhci.c
Revision 1.1.1.2 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 17:20:58 2018 UTC (3 years, 5 months ago) by root
Branches: qemu, MAIN
CVS tags: qemu0150, qemu0141, qemu0140, qemu0130, qemu0125, qemu0124, qemu0123, qemu0122, qemu0121, qemu0120, qemu0111, qemu0110, HEAD
qemu 0.11.0

    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, see <http://www.gnu.org/licenses/>.
   18:  */
   19: 
   20: #include "qemu-common.h"
   21: #include "qemu-char.h"
   22: #include "sysemu.h"
   23: #include "net.h"
   24: #include "hw/bt.h"
   25: 
   26: #define VHCI_DEV	"/dev/vhci"
   27: #define VHCI_UDEV	"/dev/hci_vhci"
   28: 
   29: struct bt_vhci_s {
   30:     int fd;
   31:     struct HCIInfo *info;
   32: 
   33:     uint8_t hdr[4096];
   34:     int len;
   35: };
   36: 
   37: static void vhci_read(void *opaque)
   38: {
   39:     struct bt_vhci_s *s = (struct bt_vhci_s *) opaque;
   40:     uint8_t *pkt;
   41:     int pktlen;
   42: 
   43:     /* Seems that we can't read only the header first and then the amount
   44:      * of data indicated in the header because Linux will discard everything
   45:      * that's not been read in one go.  */
   46:     s->len = read(s->fd, s->hdr, sizeof(s->hdr));
   47: 
   48:     if (s->len < 0) {
   49:         fprintf(stderr, "qemu: error %i reading the PDU\n", errno);
   50:         return;
   51:     }
   52: 
   53:     pkt = s->hdr;
   54:     while (s->len --)
   55:         switch (*pkt ++) {
   56:         case HCI_COMMAND_PKT:
   57:             if (s->len < 3)
   58:                 goto bad_pkt;
   59: 
   60:             pktlen = MIN(pkt[2] + 3, s->len);
   61:             s->info->cmd_send(s->info, pkt, pktlen);
   62:             s->len -= pktlen;
   63:             pkt += pktlen;
   64:             break;
   65: 
   66:         case HCI_ACLDATA_PKT:
   67:             if (s->len < 4)
   68:                 goto bad_pkt;
   69: 
   70:             pktlen = MIN(((pkt[3] << 8) | pkt[2]) + 4, s->len);
   71:             s->info->acl_send(s->info, pkt, pktlen);
   72:             s->len -= pktlen;
   73:             pkt += pktlen;
   74:             break;
   75: 
   76:         case HCI_SCODATA_PKT:
   77:             if (s->len < 3)
   78:                 goto bad_pkt;
   79: 
   80:             pktlen = MIN(pkt[2] + 3, s->len);
   81:             s->info->sco_send(s->info, pkt, pktlen);
   82:             s->len -= pktlen;
   83:             pkt += pktlen;
   84:             break;
   85: 
   86:         default:
   87:         bad_pkt:
   88:             fprintf(stderr, "qemu: bad HCI packet type %02x\n", pkt[-1]);
   89:         }
   90: }
   91: 
   92: static void vhci_host_send(void *opaque,
   93:                 int type, const uint8_t *data, int len)
   94: {
   95:     struct bt_vhci_s *s = (struct bt_vhci_s *) opaque;
   96: #if 0
   97:     uint8_t pkt = type;
   98:     struct iovec iv[2];
   99: 
  100:     iv[0].iov_base = &pkt;
  101:     iv[0].iov_len  = 1;
  102:     iv[1].iov_base = (void *) data;
  103:     iv[1].iov_len  = len;
  104: 
  105:     while (writev(s->fd, iv, 2) < 0)
  106:         if (errno != EAGAIN && errno != EINTR) {
  107:             fprintf(stderr, "qemu: error %i writing bluetooth packet.\n",
  108:                             errno);
  109:             return;
  110:         }
  111: #else
  112:     /* Apparently VHCI wants us to write everything in one chunk :-(  */
  113:     static uint8_t buf[4096];
  114: 
  115:     buf[0] = type;
  116:     memcpy(buf + 1, data, len);
  117: 
  118:     while (write(s->fd, buf, len + 1) < 0)
  119:         if (errno != EAGAIN && errno != EINTR) {
  120:             fprintf(stderr, "qemu: error %i writing bluetooth packet.\n",
  121:                             errno);
  122:             return;
  123:         }
  124: #endif
  125: }
  126: 
  127: static void vhci_out_hci_packet_event(void *opaque,
  128:                 const uint8_t *data, int len)
  129: {
  130:     vhci_host_send(opaque, HCI_EVENT_PKT, data, len);
  131: }
  132: 
  133: static void vhci_out_hci_packet_acl(void *opaque,
  134:                 const uint8_t *data, int len)
  135: {
  136:     vhci_host_send(opaque, HCI_ACLDATA_PKT, data, len);
  137: }
  138: 
  139: void bt_vhci_init(struct HCIInfo *info)
  140: {
  141:     struct bt_vhci_s *s;
  142:     int err[2];
  143:     int fd;
  144: 
  145:     fd = open(VHCI_DEV, O_RDWR);
  146:     err[0] = errno;
  147:     if (fd < 0) {
  148:         fd = open(VHCI_UDEV, O_RDWR);
  149:         err[1] = errno;
  150:     }
  151: 
  152:     if (fd < 0) {
  153:         fprintf(stderr, "qemu: Can't open `%s': %s (%i)\n",
  154:                         VHCI_DEV, strerror(err[0]), err[0]);
  155:         fprintf(stderr, "qemu: Can't open `%s': %s (%i)\n",
  156:                         VHCI_UDEV, strerror(err[1]), err[1]);
  157:         exit(-1);
  158:     }
  159: 
  160:     s = qemu_mallocz(sizeof(struct bt_vhci_s));
  161:     s->fd = fd;
  162:     s->info = info ?: qemu_next_hci();
  163:     s->info->opaque = s;
  164:     s->info->evt_recv = vhci_out_hci_packet_event;
  165:     s->info->acl_recv = vhci_out_hci_packet_acl;
  166: 
  167:     qemu_set_fd_handler(s->fd, vhci_read, NULL, s);
  168: }

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