/* * 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]; 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); }