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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
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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 * MA 02111-1307 USA
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 */
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#include "qemu-common.h"
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#include "qemu-char.h"
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#include "sysemu.h"
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#include "net.h"
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#include "hw/bt.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 = qemu_mallocz(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, 0, s);
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}