[Qemu-devel] [5348] Use VHCI to allow the host os to participate in a qemu bluetooth " vlan".

[Andrzej Zaborowski]

Revision: 5348
          http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=5348
Author:   balrog
Date:     2008-09-29 00:31:41 +0000 (Mon, 29 Sep 2008)

Log Message:
-----------
Use VHCI to allow the host os to participate in a qemu bluetooth "vlan".

This does the reverse of bt-host.c, proxying from guest to host.
Appears to be more reliable.

Modified Paths:
--------------
    trunk/Makefile
    trunk/hw/bt.h

Added Paths:
-----------
    trunk/bt-vhci.c

Modified: trunk/Makefile
===================================================================
--- trunk/Makefile      2008-09-29 00:25:17 UTC (rev 5347)
+++ trunk/Makefile      2008-09-29 00:31:41 UTC (rev 5348)
@@ -81,7 +81,7 @@
 OBJS+=usb.o usb-hub.o usb-linux.o usb-hid.o usb-msd.o usb-wacom.o
 OBJS+=usb-serial.o usb-net.o
 OBJS+=sd.o ssi-sd.o
-OBJS+=bt.o bt-host.o bt-l2cap.o bt-sdp.o bt-hci.o bt-hid.o
+OBJS+=bt.o bt-host.o bt-vhci.o bt-l2cap.o bt-sdp.o bt-hci.o bt-hid.o
 
 ifdef CONFIG_BRLAPI
 OBJS+= baum.o

Added: trunk/bt-vhci.c
===================================================================
--- trunk/bt-vhci.c                             (rev 0)
+++ trunk/bt-vhci.c     2008-09-29 00:31:41 UTC (rev 5348)
@@ -0,0 +1,172 @@
+/*
+ * Support for host VHCIs inside qemu scatternets.
+ *
+ * Copyright (C) 2008 Andrzej Zaborowski  <address@hidden>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include "qemu-common.h"
+#include "qemu-char.h"
+#include "sysemu.h"
+#include "net.h"
+#include "hw/bt.h"
+
+#include <sys/uio.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 = qemu_mallocz(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, 0, s);
+}

Modified: trunk/hw/bt.h
===================================================================
--- trunk/hw/bt.h       2008-09-29 00:25:17 UTC (rev 5347)
+++ trunk/hw/bt.h       2008-09-29 00:31:41 UTC (rev 5348)
@@ -115,6 +115,9 @@
 /* bt-host.c */
 struct HCIInfo *bt_host_hci(const char *id);
 
+/* bt-vhci.c */
+void bt_vhci_init(struct HCIInfo *info);
+
 /* bt-hci-csr.c */
 enum {
     csrhci_pin_reset,
@@ -167,6 +170,11 @@
 /* bt-sdp.c */
 void bt_l2cap_sdp_init(struct bt_l2cap_device_s *dev);
 
+/* bt-hid.c */
+struct bt_device_s *bt_mouse_init(struct bt_scatternet_s *net);
+struct bt_device_s *bt_tablet_init(struct bt_scatternet_s *net);
+struct bt_device_s *bt_keyboard_init(struct bt_scatternet_s *net);
+
 /* Link Management Protocol layer defines */
 
 #define LLID_ACLU_CONT         0x1