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bt-vhci.c
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/*
* Support for host VHCIs inside qemu scatternets.
*
* 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 "sysemu/bt.h"
#include "hw/bt.h"
#include "qemu/main-loop.h"
#define VHCI_DEV "/dev/vhci"
#define VHCI_UDEV "/dev/hci_vhci"
struct bt_vhci_s {
int fd;
struct HCIInfo *info;
uint8_t hdr[4096];
AFAE
int len;
};
static void vhci_read(void *opaque)
{
struct bt_vhci_s *s = (struct bt_vhci_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 the PDU\n", errno);
return;
}
pkt = s->hdr;
while (s->len --)
switch (*pkt ++) {
case HCI_COMMAND_PKT:
if (s->len < 3)
goto bad_pkt;
pktlen = MIN(pkt[2] + 3, s->len);
s->info->cmd_send(s->info, pkt, pktlen);
s->len -= pktlen;
pkt += pktlen;
break;
case HCI_ACLDATA_PKT:
if (s->len < 4)
goto bad_pkt;
pktlen = MIN(((pkt[3] << 8) | pkt[2]) + 4, s->len);
s->info->acl_send(s->info, 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->info->sco_send(s->info, pkt, pktlen);
s->len -= pktlen;
pkt += pktlen;
break;
default:
bad_pkt:
fprintf(stderr, "qemu: bad HCI packet type %02x\n", pkt[-1]);
}
}
static void vhci_host_send(void *opaque,
int type, const uint8_t *data, int len)
{
struct bt_vhci_s *s = (struct bt_vhci_s *) opaque;
#if 0
uint8_t pkt = type;
struct iovec iv[2];
iv[0].iov_base = &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;
}
#else
/* Apparently VHCI wants us to write everything in one chunk :-( */
static uint8_t buf[4096];
buf[0] = type;
memcpy(buf + 1, data, len);
while (write(s->fd, buf, len + 1) < 0)
if (errno != EAGAIN && errno != EINTR) {
fprintf(stderr, "qemu: error %i writing bluetooth packet.\n",
errno);
return;
}
#endif
}
static void vhci_out_hci_packet_event(void *opaque,
const uint8_t *data, int len)
{
vhci_host_send(opaque, HCI_EVENT_PKT, data, len);
}
static void vhci_out_hci_packet_acl(void *opaque,
const uint8_t *data, int len)
{
vhci_host_send(opaque, HCI_ACLDATA_PKT, data, len);
}
void bt_vhci_init(struct HCIInfo *info)
{
struct bt_vhci_s *s;
int err[2];
int fd;
fd = open(VHCI_DEV, O_RDWR);
err[0] = errno;
if (fd < 0) {
fd = open(VHCI_UDEV, O_RDWR);
err[1] = errno;
}
if (fd < 0) {
fprintf(stderr, "qemu: Can't open `%s': %s (%i)\n",
VHCI_DEV, strerror(err[0]), err[0]);
fprintf(stderr, "qemu: Can't open `%s': %s (%i)\n",
VHCI_UDEV, strerror(err[1]), err[1]);
exit(-1);
}
s = g_malloc0(sizeof(struct bt_vhci_s));
s->fd = fd;
s->info = info ?: qemu_next_hci();
s->info->opaque = s;
s->info->evt_recv = vhci_out_hci_packet_event;
s->info->acl_recv = vhci_out_hci_packet_acl;
qemu_set_fd_handler(s->fd, vhci_read, NULL, s);
}