bt-host.c

   1 /*
   2  * Wrap a host Bluetooth HCI socket in a struct HCIInfo.
   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 "bt-host.h"
  25
  26 #ifndef _WIN32
  27 # include <errno.h>
  28 # include <sys/ioctl.h>
  29 # include <sys/uio.h>
  30 # ifdef CONFIG_BLUEZ
  31 #  include <bluetooth/bluetooth.h>
  32 #  include <bluetooth/hci.h>
  33 #  include <bluetooth/hci_lib.h>
  34 # else
  35 #  include "hw/bt.h"
  36 #  define HCI_MAX_FRAME_SIZE    1028
  37 # endif
  38
  39 struct bt_host_hci_s {
  40     struct HCIInfo hci;
  41     int fd;
  42
  43     uint8_t hdr[HCI_MAX_FRAME_SIZE];
  44     int len;
  45 };
  46
  47 static void bt_host_send(struct HCIInfo *hci,
  48                 int type, const uint8_t *data, int len)
  49 {
  50     struct bt_host_hci_s *s = (struct bt_host_hci_s *) hci;
  51     uint8_t pkt = type;
  52     struct iovec iv[2];
  53     int ret;
  54
  55     iv[0].iov_base = (void *)&pkt;
  56     iv[0].iov_len  = 1;
  57     iv[1].iov_base = (void *) data;
  58     iv[1].iov_len  = len;
  59
  60     while ((ret = writev(s->fd, iv, 2)) < 0)
  61         if (errno != EAGAIN && errno != EINTR) {
  62             fprintf(stderr, "qemu: error %i writing bluetooth packet.\n",
  63                             errno);
  64             return;
  65         }
  66 }
  67
  68 static void bt_host_cmd(struct HCIInfo *hci, const uint8_t *data, int len)
  69 {
  70     bt_host_send(hci, HCI_COMMAND_PKT, data, len);
  71 }
  72
  73 static void bt_host_acl(struct HCIInfo *hci, const uint8_t *data, int len)
  74 {
  75     bt_host_send(hci, HCI_ACLDATA_PKT, data, len);
  76 }
  77
  78 static void bt_host_sco(struct HCIInfo *hci, const uint8_t *data, int len)
  79 {
  80     bt_host_send(hci, HCI_SCODATA_PKT, data, len);
  81 }
  82
  83 static int bt_host_read_poll(void *opaque)
  84 {
  85     struct bt_host_hci_s *s = (struct bt_host_hci_s *) opaque;
  86
  87     return !!s->hci.evt_recv;
  88 }
  89
  90 static void bt_host_read(void *opaque)
  91 {
  92     struct bt_host_hci_s *s = (struct bt_host_hci_s *) opaque;
  93     uint8_t *pkt;
  94     int pktlen;
  95
  96     /* Seems that we can't read only the header first and then the amount
  97      * of data indicated in the header because Linux will discard everything
  98      * that's not been read in one go.  */
  99     s->len = read(s->fd, s->hdr, sizeof(s->hdr));
 100
 101     if (s->len < 0) {
 102         fprintf(stderr, "qemu: error %i reading HCI frame\n", errno);
 103         return;
 104     }
 105
 106     pkt = s->hdr;
 107     while (s->len --)
 108         switch (*pkt ++) {
 109         case HCI_EVENT_PKT:
 110             if (s->len < 2)
 111                 goto bad_pkt;
 112
 113             pktlen = MIN(pkt[1] + 2, s->len);
 114             s->hci.evt_recv(s->hci.opaque, pkt, pktlen);
 115             s->len -= pktlen;
 116             pkt += pktlen;
 117
 118             /* TODO: if this is an Inquiry Result event, it's also
 119              * interpreted by Linux kernel before we received it, possibly
 120              * we should clean the kernel Inquiry cache through
 121              * ioctl(s->fd, HCI_INQUIRY, ...).  */
 122             break;
 123
 124         case HCI_ACLDATA_PKT:
 125             if (s->len < 4)
 126                 goto bad_pkt;
 127
 128             pktlen = MIN(((pkt[3] << 8) | pkt[2]) + 4, s->len);
 129             s->hci.acl_recv(s->hci.opaque, pkt, pktlen);
 130             s->len -= pktlen;
 131             pkt += pktlen;
 132             break;
 133
 134         case HCI_SCODATA_PKT:
 135             if (s->len < 3)
 136                 goto bad_pkt;
 137
 138             pktlen = MIN(pkt[2] + 3, s->len);
 139             s->len -= pktlen;
 140             pkt += pktlen;
 141
 142         default:
 143         bad_pkt:
 144             fprintf(stderr, "qemu: bad HCI packet type %02x\n", pkt[-1]);
 145         }
 146 }
 147
 148 static int bt_host_bdaddr_set(struct HCIInfo *hci, const uint8_t *bd_addr)
 149 {
 150     return -ENOTSUP;
 151 }
 152
 153 struct HCIInfo *bt_host_hci(const char *id)
 154 {
 155     struct bt_host_hci_s *s;
 156     int fd = -1;
 157 # ifdef CONFIG_BLUEZ
 158     int dev_id = hci_devid(id);
 159     struct hci_filter flt;
 160
 161     if (dev_id < 0) {
 162         fprintf(stderr, "qemu: `%s' not available\n", id);
 163         return 0;
 164     }
 165
 166     fd = hci_open_dev(dev_id);
 167
 168     /* XXX: can we ensure nobody else has the device opened?  */
 169 # endif
 170
 171     if (fd < 0) {
 172         fprintf(stderr, "qemu: Can't open `%s': %s (%i)\n",
 173                         id, strerror(errno), errno);
 174         return NULL;
 175     }
 176
 177 # ifdef CONFIG_BLUEZ
 178     hci_filter_clear(&flt);
 179     hci_filter_all_ptypes(&flt);
 180     hci_filter_all_events(&flt);
 181
 182     if (setsockopt(fd, SOL_HCI, HCI_FILTER, &flt, sizeof(flt)) < 0) {
 183         fprintf(stderr, "qemu: Can't set HCI filter on socket (%i)\n", errno);
 184         return 0;
 185     }
 186 # endif
 187
 188     s = qemu_mallocz(sizeof(struct bt_host_hci_s));
 189     s->fd = fd;
 190     s->hci.cmd_send = bt_host_cmd;
 191     s->hci.sco_send = bt_host_sco;
 192     s->hci.acl_send = bt_host_acl;
 193     s->hci.bdaddr_set = bt_host_bdaddr_set;
 194
 195     qemu_set_fd_handler2(s->fd, bt_host_read_poll, bt_host_read, NULL, s);
 196
 197     return &s->hci;
 198 }
 199 #else
 200 struct HCIInfo *bt_host_hci(const char *id)
 201 {
 202     fprintf(stderr, "qemu: bluetooth passthrough not supported (yet)\n");
 203
 204     return 0;
 205 }
 206 #endif