Archipelago » qemu

/*

 * 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);

}