root / bt-vhci.c @ c3268cc1
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/*
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* Support for host VHCIs inside qemu scatternets.
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*
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* Copyright (C) 2008 Andrzej Zaborowski <balrog@zabor.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 or
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* (at your option) version 3 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu-common.h" |
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#include "sysemu/bt.h" |
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#include "hw/bt.h" |
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#include "qemu/main-loop.h" |
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#define VHCI_DEV "/dev/vhci" |
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#define VHCI_UDEV "/dev/hci_vhci" |
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struct bt_vhci_s {
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int fd;
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struct HCIInfo *info;
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uint8_t hdr[4096];
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int len;
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}; |
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static void vhci_read(void *opaque) |
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{ |
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struct bt_vhci_s *s = (struct bt_vhci_s *) opaque; |
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uint8_t *pkt; |
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int pktlen;
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/* Seems that we can't read only the header first and then the amount
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* of data indicated in the header because Linux will discard everything
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* that's not been read in one go. */
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s->len = read(s->fd, s->hdr, sizeof(s->hdr));
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if (s->len < 0) { |
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fprintf(stderr, "qemu: error %i reading the PDU\n", errno);
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return;
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} |
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pkt = s->hdr; |
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while (s->len --)
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switch (*pkt ++) {
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case HCI_COMMAND_PKT:
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if (s->len < 3) |
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goto bad_pkt;
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pktlen = MIN(pkt[2] + 3, s->len); |
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s->info->cmd_send(s->info, pkt, pktlen); |
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s->len -= pktlen; |
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pkt += pktlen; |
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break;
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case HCI_ACLDATA_PKT:
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if (s->len < 4) |
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goto bad_pkt;
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pktlen = MIN(((pkt[3] << 8) | pkt[2]) + 4, s->len); |
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s->info->acl_send(s->info, pkt, pktlen); |
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s->len -= pktlen; |
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pkt += pktlen; |
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break;
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case HCI_SCODATA_PKT:
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if (s->len < 3) |
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goto bad_pkt;
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pktlen = MIN(pkt[2] + 3, s->len); |
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s->info->sco_send(s->info, pkt, pktlen); |
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s->len -= pktlen; |
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pkt += pktlen; |
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break;
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default:
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bad_pkt:
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fprintf(stderr, "qemu: bad HCI packet type %02x\n", pkt[-1]); |
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} |
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} |
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static void vhci_host_send(void *opaque, |
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int type, const uint8_t *data, int len) |
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{ |
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struct bt_vhci_s *s = (struct bt_vhci_s *) opaque; |
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#if 0
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uint8_t pkt = type;
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struct iovec iv[2];
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iv[0].iov_base = &pkt;
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iv[0].iov_len = 1;
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iv[1].iov_base = (void *) data;
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iv[1].iov_len = len;
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while (writev(s->fd, iv, 2) < 0)
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if (errno != EAGAIN && errno != EINTR) {
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fprintf(stderr, "qemu: error %i writing bluetooth packet.\n",
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errno);
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return;
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}
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#else
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/* Apparently VHCI wants us to write everything in one chunk :-( */
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static uint8_t buf[4096]; |
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buf[0] = type;
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memcpy(buf + 1, data, len);
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while (write(s->fd, buf, len + 1) < 0) |
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if (errno != EAGAIN && errno != EINTR) {
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fprintf(stderr, "qemu: error %i writing bluetooth packet.\n",
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errno); |
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return;
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} |
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#endif
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} |
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static void vhci_out_hci_packet_event(void *opaque, |
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const uint8_t *data, int len) |
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{ |
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vhci_host_send(opaque, HCI_EVENT_PKT, data, len); |
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} |
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static void vhci_out_hci_packet_acl(void *opaque, |
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const uint8_t *data, int len) |
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{ |
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vhci_host_send(opaque, HCI_ACLDATA_PKT, data, len); |
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} |
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void bt_vhci_init(struct HCIInfo *info) |
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{ |
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struct bt_vhci_s *s;
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int err[2]; |
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int fd;
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fd = open(VHCI_DEV, O_RDWR); |
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err[0] = errno;
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if (fd < 0) { |
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fd = open(VHCI_UDEV, O_RDWR); |
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err[1] = errno;
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} |
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if (fd < 0) { |
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fprintf(stderr, "qemu: Can't open `%s': %s (%i)\n",
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VHCI_DEV, strerror(err[0]), err[0]); |
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fprintf(stderr, "qemu: Can't open `%s': %s (%i)\n",
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VHCI_UDEV, strerror(err[1]), err[1]); |
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exit(-1);
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} |
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s = g_malloc0(sizeof(struct bt_vhci_s)); |
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s->fd = fd; |
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s->info = info ?: qemu_next_hci(); |
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s->info->opaque = s; |
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s->info->evt_recv = vhci_out_hci_packet_event; |
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s->info->acl_recv = vhci_out_hci_packet_acl; |
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qemu_set_fd_handler(s->fd, vhci_read, NULL, s);
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} |