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|
/*
* Wrap a host Bluetooth HCI socket in a struct HCIInfo.
*
* Copyright (C) 2008 Andrzej Zaborowski <balrog@zabor.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 or
* (at your option) version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu-common.h"
#include "bt-host.h"
#include "main-loop.h"
#ifndef _WIN32
# include <errno.h>
# include <sys/ioctl.h>
# include <sys/uio.h>
# ifdef CONFIG_BLUEZ
# include <bluetooth/bluetooth.h>
# include <bluetooth/hci.h>
# include <bluetooth/hci_lib.h>
# else
# include "hw/bt.h"
# define HCI_MAX_FRAME_SIZE 1028
# endif
struct bt_host_hci_s {
struct HCIInfo hci;
int fd;
uint8_t hdr[HCI_MAX_FRAME_SIZE];
int len;
};
static void bt_host_send(struct HCIInfo *hci,
int type, const uint8_t *data, int len)
{
struct bt_host_hci_s *s = (struct bt_host_hci_s *) hci;
uint8_t pkt = type;
struct iovec iv[2];
iv[0].iov_base = (void *)&pkt;
iv[0].iov_len = 1;
iv[1].iov_base = (void *) data;
iv[1].iov_len = len;
while (writev(s->fd, iv, 2) < 0) {
if (errno != EAGAIN && errno != EINTR) {
fprintf(stderr, "qemu: error %i writing bluetooth packet.\n",
errno);
return;
}
}
}
static void bt_host_cmd(struct HCIInfo *hci, const uint8_t *data, int len)
{
bt_host_send(hci, HCI_COMMAND_PKT, data, len);
}
static void bt_host_acl(struct HCIInfo *hci, const uint8_t *data, int len)
{
bt_host_send(hci, HCI_ACLDATA_PKT, data, len);
}
static void bt_host_sco(struct HCIInfo *hci, const uint8_t *data, int len)
{
bt_host_send(hci, HCI_SCODATA_PKT, data, len);
}
static void bt_host_read(void *opaque)
{
struct bt_host_hci_s *s = (struct bt_host_hci_s *) opaque;
uint8_t *pkt;
int pktlen;
/* Seems that we can't read only the header first and then the amount
* of data indicated in the header because Linux will discard everything
* that's not been read in one go. */
s->len = read(s->fd, s->hdr, sizeof(s->hdr));
if (s->len < 0) {
fprintf(stderr, "qemu: error %i reading HCI frame\n", errno);
return;
}
pkt = s->hdr;
while (s->len --)
switch (*pkt ++) {
case HCI_EVENT_PKT:
if (s->len < 2)
goto bad_pkt;
pktlen = MIN(pkt[1] + 2, s->len);
s->hci.evt_recv(s->hci.opaque, pkt, pktlen);
s->len -= pktlen;
pkt += pktlen;
/* TODO: if this is an Inquiry Result event, it's also
* interpreted by Linux kernel before we received it, possibly
* we should clean the kernel Inquiry cache through
* ioctl(s->fd, HCI_INQUIRY, ...). */
break;
case HCI_ACLDATA_PKT:
if (s->len < 4)
goto bad_pkt;
pktlen = MIN(((pkt[3] << 8) | pkt[2]) + 4, s->len);
s->hci.acl_recv(s->hci.opaque, pkt, pktlen);
s->len -= pktlen;
pkt += pktlen;
break;
case HCI_SCODATA_PKT:
if (s->len < 3)
goto bad_pkt;
pktlen = MIN(pkt[2] + 3, s->len);
s->len -= pktlen;
pkt += pktlen;
break;
default:
bad_pkt:
fprintf(stderr, "qemu: bad HCI packet type %02x\n", pkt[-1]);
}
}
static int bt_host_bdaddr_set(struct HCIInfo *hci, const uint8_t *bd_addr)
{
return -ENOTSUP;
}
struct HCIInfo *bt_host_hci(const char *id)
{
struct bt_host_hci_s *s;
int fd = -1;
# ifdef CONFIG_BLUEZ
int dev_id = hci_devid(id);
struct hci_filter flt;
if (dev_id < 0) {
fprintf(stderr, "qemu: `%s' not available\n", id);
return 0;
}
fd = hci_open_dev(dev_id);
/* XXX: can we ensure nobody else has the device opened? */
# endif
if (fd < 0) {
fprintf(stderr, "qemu: Can't open `%s': %s (%i)\n",
id, strerror(errno), errno);
return NULL;
}
# ifdef CONFIG_BLUEZ
hci_filter_clear(&flt);
hci_filter_all_ptypes(&flt);
hci_filter_all_events(&flt);
if (setsockopt(fd, SOL_HCI, HCI_FILTER, &flt, sizeof(flt)) < 0) {
fprintf(stderr, "qemu: Can't set HCI filter on socket (%i)\n", errno);
return 0;
}
# endif
s = g_malloc0(sizeof(struct bt_host_hci_s));
s->fd = fd;
s->hci.cmd_send = bt_host_cmd;
s->hci.sco_send = bt_host_sco;
s->hci.acl_send = bt_host_acl;
s->hci.bdaddr_set = bt_host_bdaddr_set;
qemu_set_fd_handler(s->fd, bt_host_read, NULL, s);
return &s->hci;
}
#else
struct HCIInfo *bt_host_hci(const char *id)
{
fprintf(stderr, "qemu: bluetooth passthrough not supported (yet)\n");
return 0;
}
#endif
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