xref: /illumos-kvm-cmd/bt-vhci.c (revision 68396ea9)
1 /*
2  * Support for host VHCIs inside qemu scatternets.
3  *
4  * Copyright (C) 2008 Andrzej Zaborowski  <balrog@zabor.org>
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License as
8  * published by the Free Software Foundation; either version 2 or
9  * (at your option) version 3 of the License.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License along
17  * with this program; if not, see <http://www.gnu.org/licenses/>.
18  */
19 
20 #include "qemu-common.h"
21 #include "qemu-char.h"
22 #include "sysemu.h"
23 #include "net.h"
24 #include "hw/bt.h"
25 
26 #define VHCI_DEV	"/dev/vhci"
27 #define VHCI_UDEV	"/dev/hci_vhci"
28 
29 struct bt_vhci_s {
30     int fd;
31     struct HCIInfo *info;
32 
33     uint8_t hdr[4096];
34     int len;
35 };
36 
vhci_read(void * opaque)37 static void vhci_read(void *opaque)
38 {
39     struct bt_vhci_s *s = (struct bt_vhci_s *) opaque;
40     uint8_t *pkt;
41     int pktlen;
42 
43     /* Seems that we can't read only the header first and then the amount
44      * of data indicated in the header because Linux will discard everything
45      * that's not been read in one go.  */
46     s->len = read(s->fd, s->hdr, sizeof(s->hdr));
47 
48     if (s->len < 0) {
49         fprintf(stderr, "qemu: error %i reading the PDU\n", errno);
50         return;
51     }
52 
53     pkt = s->hdr;
54     while (s->len --)
55         switch (*pkt ++) {
56         case HCI_COMMAND_PKT:
57             if (s->len < 3)
58                 goto bad_pkt;
59 
60             pktlen = MIN(pkt[2] + 3, s->len);
61             s->info->cmd_send(s->info, pkt, pktlen);
62             s->len -= pktlen;
63             pkt += pktlen;
64             break;
65 
66         case HCI_ACLDATA_PKT:
67             if (s->len < 4)
68                 goto bad_pkt;
69 
70             pktlen = MIN(((pkt[3] << 8) | pkt[2]) + 4, s->len);
71             s->info->acl_send(s->info, pkt, pktlen);
72             s->len -= pktlen;
73             pkt += pktlen;
74             break;
75 
76         case HCI_SCODATA_PKT:
77             if (s->len < 3)
78                 goto bad_pkt;
79 
80             pktlen = MIN(pkt[2] + 3, s->len);
81             s->info->sco_send(s->info, pkt, pktlen);
82             s->len -= pktlen;
83             pkt += pktlen;
84             break;
85 
86         default:
87         bad_pkt:
88             fprintf(stderr, "qemu: bad HCI packet type %02x\n", pkt[-1]);
89         }
90 }
91 
vhci_host_send(void * opaque,int type,const uint8_t * data,int len)92 static void vhci_host_send(void *opaque,
93                 int type, const uint8_t *data, int len)
94 {
95     struct bt_vhci_s *s = (struct bt_vhci_s *) opaque;
96 #if 0
97     uint8_t pkt = type;
98     struct iovec iv[2];
99 
100     iv[0].iov_base = &pkt;
101     iv[0].iov_len  = 1;
102     iv[1].iov_base = (void *) data;
103     iv[1].iov_len  = len;
104 
105     while (writev(s->fd, iv, 2) < 0)
106         if (errno != EAGAIN && errno != EINTR) {
107             fprintf(stderr, "qemu: error %i writing bluetooth packet.\n",
108                             errno);
109             return;
110         }
111 #else
112     /* Apparently VHCI wants us to write everything in one chunk :-(  */
113     static uint8_t buf[4096];
114 
115     buf[0] = type;
116     memcpy(buf + 1, data, len);
117 
118     while (write(s->fd, buf, len + 1) < 0)
119         if (errno != EAGAIN && errno != EINTR) {
120             fprintf(stderr, "qemu: error %i writing bluetooth packet.\n",
121                             errno);
122             return;
123         }
124 #endif
125 }
126 
vhci_out_hci_packet_event(void * opaque,const uint8_t * data,int len)127 static void vhci_out_hci_packet_event(void *opaque,
128                 const uint8_t *data, int len)
129 {
130     vhci_host_send(opaque, HCI_EVENT_PKT, data, len);
131 }
132 
vhci_out_hci_packet_acl(void * opaque,const uint8_t * data,int len)133 static void vhci_out_hci_packet_acl(void *opaque,
134                 const uint8_t *data, int len)
135 {
136     vhci_host_send(opaque, HCI_ACLDATA_PKT, data, len);
137 }
138 
bt_vhci_init(struct HCIInfo * info)139 void bt_vhci_init(struct HCIInfo *info)
140 {
141     struct bt_vhci_s *s;
142     int err[2];
143     int fd;
144 
145     fd = open(VHCI_DEV, O_RDWR);
146     err[0] = errno;
147     if (fd < 0) {
148         fd = open(VHCI_UDEV, O_RDWR);
149         err[1] = errno;
150     }
151 
152     if (fd < 0) {
153         fprintf(stderr, "qemu: Can't open `%s': %s (%i)\n",
154                         VHCI_DEV, strerror(err[0]), err[0]);
155         fprintf(stderr, "qemu: Can't open `%s': %s (%i)\n",
156                         VHCI_UDEV, strerror(err[1]), err[1]);
157         exit(-1);
158     }
159 
160     s = qemu_mallocz(sizeof(struct bt_vhci_s));
161     s->fd = fd;
162     s->info = info ?: qemu_next_hci();
163     s->info->opaque = s;
164     s->info->evt_recv = vhci_out_hci_packet_event;
165     s->info->acl_recv = vhci_out_hci_packet_acl;
166 
167     qemu_set_fd_handler(s->fd, vhci_read, NULL, s);
168 }
169