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      1 /*
      2  * Support for host VHCIs inside qemu scatternets.
      3  *
      4  * Copyright (C) 2008 Andrzej Zaborowski  <balrog (at) 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 "net.h"
     23 #include "hw/bt.h"
     24 
     25 #define VHCI_DEV	"/dev/vhci"
     26 #define VHCI_UDEV	"/dev/hci_vhci"
     27 
     28 struct bt_vhci_s {
     29     int fd;
     30     struct HCIInfo *info;
     31 
     32     uint8_t hdr[4096];
     33     int len;
     34 };
     35 
     36 static void vhci_read(void *opaque)
     37 {
     38     struct bt_vhci_s *s = (struct bt_vhci_s *) opaque;
     39     uint8_t *pkt;
     40     int pktlen;
     41 
     42     /* Seems that we can't read only the header first and then the amount
     43      * of data indicated in the header because Linux will discard everything
     44      * that's not been read in one go.  */
     45     s->len = read(s->fd, s->hdr, sizeof(s->hdr));
     46 
     47     if (s->len < 0) {
     48         fprintf(stderr, "qemu: error %i reading the PDU\n", errno);
     49         return;
     50     }
     51 
     52     pkt = s->hdr;
     53     while (s->len --)
     54         switch (*pkt ++) {
     55         case HCI_COMMAND_PKT:
     56             if (s->len < 3)
     57                 goto bad_pkt;
     58 
     59             pktlen = MIN(pkt[2] + 3, s->len);
     60             s->info->cmd_send(s->info, pkt, pktlen);
     61             s->len -= pktlen;
     62             pkt += pktlen;
     63             break;
     64 
     65         case HCI_ACLDATA_PKT:
     66             if (s->len < 4)
     67                 goto bad_pkt;
     68 
     69             pktlen = MIN(((pkt[3] << 8) | pkt[2]) + 4, s->len);
     70             s->info->acl_send(s->info, pkt, pktlen);
     71             s->len -= pktlen;
     72             pkt += pktlen;
     73             break;
     74 
     75         case HCI_SCODATA_PKT:
     76             if (s->len < 3)
     77                 goto bad_pkt;
     78 
     79             pktlen = MIN(pkt[2] + 3, s->len);
     80             s->info->sco_send(s->info, pkt, pktlen);
     81             s->len -= pktlen;
     82             pkt += pktlen;
     83             break;
     84 
     85         default:
     86         bad_pkt:
     87             fprintf(stderr, "qemu: bad HCI packet type %02x\n", pkt[-1]);
     88         }
     89 }
     90 
     91 static void vhci_host_send(void *opaque,
     92                 int type, const uint8_t *data, int len)
     93 {
     94     struct bt_vhci_s *s = (struct bt_vhci_s *) opaque;
     95 #if 0
     96     uint8_t pkt = type;
     97     struct iovec iv[2];
     98 
     99     iv[0].iov_base = &pkt;
    100     iv[0].iov_len  = 1;
    101     iv[1].iov_base = (void *) data;
    102     iv[1].iov_len  = len;
    103 
    104     while (writev(s->fd, iv, 2) < 0)
    105         if (errno != EAGAIN && errno != EINTR) {
    106             fprintf(stderr, "qemu: error %i writing bluetooth packet.\n",
    107                             errno);
    108             return;
    109         }
    110 #else
    111     /* Apparently VHCI wants us to write everything in one chunk :-(  */
    112     static uint8_t buf[4096];
    113 
    114     buf[0] = type;
    115     memcpy(buf + 1, data, len);
    116 
    117     while (write(s->fd, buf, len + 1) < 0)
    118         if (errno != EAGAIN && errno != EINTR) {
    119             fprintf(stderr, "qemu: error %i writing bluetooth packet.\n",
    120                             errno);
    121             return;
    122         }
    123 #endif
    124 }
    125 
    126 static void vhci_out_hci_packet_event(void *opaque,
    127                 const uint8_t *data, int len)
    128 {
    129     vhci_host_send(opaque, HCI_EVENT_PKT, data, len);
    130 }
    131 
    132 static void vhci_out_hci_packet_acl(void *opaque,
    133                 const uint8_t *data, int len)
    134 {
    135     vhci_host_send(opaque, HCI_ACLDATA_PKT, data, len);
    136 }
    137 
    138 void bt_vhci_init(struct HCIInfo *info)
    139 {
    140     struct bt_vhci_s *s;
    141     int err[2];
    142     int fd;
    143 
    144     fd = open(VHCI_DEV, O_RDWR);
    145     err[0] = errno;
    146     if (fd < 0) {
    147         fd = open(VHCI_UDEV, O_RDWR);
    148         err[1] = errno;
    149     }
    150 
    151     if (fd < 0) {
    152         fprintf(stderr, "qemu: Can't open `%s': %s (%i)\n",
    153                         VHCI_DEV, strerror(err[0]), err[0]);
    154         fprintf(stderr, "qemu: Can't open `%s': %s (%i)\n",
    155                         VHCI_UDEV, strerror(err[1]), err[1]);
    156         exit(-1);
    157     }
    158 
    159     s = qemu_mallocz(sizeof(struct bt_vhci_s));
    160     s->fd = fd;
    161     s->info = info ?: qemu_next_hci();
    162     s->info->opaque = s;
    163     s->info->evt_recv = vhci_out_hci_packet_event;
    164     s->info->acl_recv = vhci_out_hci_packet_acl;
    165 
    166     qemu_set_fd_handler(s->fd, vhci_read, NULL, s);
    167 }
    168