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authorbalrog <balrog@c046a42c-6fe2-441c-8c8c-71466251a162>2008-09-28 23:49:55 +0000
committerbalrog <balrog@c046a42c-6fe2-441c-8c8c-71466251a162>2008-09-28 23:49:55 +0000
commitfb599c9a030ac438755627f5919bfc40a57a0b9e (patch)
treea6f981b7ef3fa609698fb2511076e9cd9d5efa92 /bt-host.c
parentEmulate a serial bluetooth HCI with H4+ extensions and attach to n8x0's UART. (diff)
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Implement a HCI passthrough to host.
This allows using a host's physical HCI as one of the HCIs attached to the virtual machine. This brings various limitations because not all commands/events are passed through by Linux kernel, some are interpreted by the host's kernel for a speed gain. git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5344 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'bt-host.c')
-rw-r--r--bt-host.c198
1 files changed, 198 insertions, 0 deletions
diff --git a/bt-host.c b/bt-host.c
new file mode 100644
index 000000000..5d3e8405b
--- /dev/null
+++ b/bt-host.c
@@ -0,0 +1,198 @@
+/*
+ * Wrap a host Bluetooth HCI socket in a struct HCIInfo.
+ *
+ * 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, 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 <errno.h>
+#include <sys/ioctl.h>
+#include <sys/uio.h>
+#ifdef CONFIG_BLUEZ
+# include <bluetooth/bluetooth.h>
+# include <bluetooth/hci.h>
+# include <bluetooth/hci_lib.h>
+#else
+# include "hw/bt.h"
+# define HCI_MAX_FRAME_SIZE 1028
+#endif
+
+struct bt_host_hci_s {
+ struct HCIInfo hci;
+ int fd;
+
+ uint8_t hdr[HCI_MAX_FRAME_SIZE];
+ int len;
+};
+
+static void bt_host_send(struct HCIInfo *hci,
+ int type, const uint8_t *data, int len)
+{
+ struct bt_host_hci_s *s = (struct bt_host_hci_s *) hci;
+ uint8_t pkt = type;
+ struct iovec iv[2];
+ int ret;
+
+ iv[0].iov_base = &pkt;
+ iv[0].iov_len = 1;
+ iv[1].iov_base = (void *) data;
+ iv[1].iov_len = len;
+
+ while ((ret = writev(s->fd, iv, 2)) < 0)
+ if (errno != EAGAIN && errno != EINTR) {
+ fprintf(stderr, "qemu: error %i writing bluetooth packet.\n",
+ errno);
+ return;
+ }
+}
+
+static void bt_host_cmd(struct HCIInfo *hci, const uint8_t *data, int len)
+{
+ bt_host_send(hci, HCI_COMMAND_PKT, data, len);
+}
+
+static void bt_host_acl(struct HCIInfo *hci, const uint8_t *data, int len)
+{
+ bt_host_send(hci, HCI_ACLDATA_PKT, data, len);
+}
+
+static void bt_host_sco(struct HCIInfo *hci, const uint8_t *data, int len)
+{
+ bt_host_send(hci, HCI_SCODATA_PKT, data, len);
+}
+
+static int bt_host_read_poll(void *opaque)
+{
+ struct bt_host_hci_s *s = (struct bt_host_hci_s *) opaque;
+
+ return !!s->hci.evt_recv;
+}
+
+static void bt_host_read(void *opaque)
+{
+ struct bt_host_hci_s *s = (struct bt_host_hci_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 HCI frame\n", errno);
+ return;
+ }
+
+ pkt = s->hdr;
+ while (s->len --)
+ switch (*pkt ++) {
+ case HCI_EVENT_PKT:
+ if (s->len < 2)
+ goto bad_pkt;
+
+ pktlen = MIN(pkt[1] + 2, s->len);
+ s->hci.evt_recv(s->hci.opaque, pkt, pktlen);
+ s->len -= pktlen;
+ pkt += pktlen;
+
+ /* TODO: if this is an Inquiry Result event, it's also
+ * interpreted by Linux kernel before we received it, possibly
+ * we should clean the kernel Inquiry cache through
+ * ioctl(s->fd, HCI_INQUIRY, ...). */
+ break;
+
+ case HCI_ACLDATA_PKT:
+ if (s->len < 4)
+ goto bad_pkt;
+
+ pktlen = MIN(((pkt[3] << 8) | pkt[2]) + 4, s->len);
+ s->hci.acl_recv(s->hci.opaque, 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->len -= pktlen;
+ pkt += pktlen;
+
+ default:
+ bad_pkt:
+ fprintf(stderr, "qemu: bad HCI packet type %02x\n", pkt[-1]);
+ }
+}
+
+static int bt_host_bdaddr_set(struct HCIInfo *hci, const uint8_t *bd_addr)
+{
+ return -ENOTSUP;
+}
+
+struct HCIInfo *bt_host_hci(const char *id)
+{
+ struct bt_host_hci_s *s;
+ int fd = -1;
+#ifdef CONFIG_BLUEZ
+ int dev_id = hci_devid(id);
+ struct hci_filter flt;
+
+ if (dev_id < 0) {
+ fprintf(stderr, "qemu: `%s' not available\n", id);
+ return 0;
+ }
+
+ fd = hci_open_dev(dev_id);
+
+ /* XXX: can we ensure nobody else has the device opened? */
+#endif
+
+ if (fd < 0) {
+ fprintf(stderr, "qemu: Can't open `%s': %s (%i)\n",
+ id, strerror(errno), errno);
+ return 0;
+ }
+
+#ifdef CONFIG_BLUEZ
+ hci_filter_clear(&flt);
+ hci_filter_all_ptypes(&flt);
+ hci_filter_all_events(&flt);
+
+ if (setsockopt(fd, SOL_HCI, HCI_FILTER, &flt, sizeof(flt)) < 0) {
+ fprintf(stderr, "qemu: Can't set HCI filter on socket (%i)\n", errno);
+ return 0;
+ }
+#endif
+
+ s = qemu_mallocz(sizeof(struct bt_host_hci_s));
+ s->fd = fd;
+ s->hci.cmd_send = bt_host_cmd;
+ s->hci.sco_send = bt_host_sco;
+ s->hci.acl_send = bt_host_acl;
+ s->hci.bdaddr_set = bt_host_bdaddr_set;
+
+ qemu_set_fd_handler2(s->fd, bt_host_read_poll, bt_host_read, 0, s);
+
+ return &s->hci;
+}