PPC: rename msync to msync_4xx
[qemu.git] / bt-vhci.c
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 "net.h"
23 #include "hw/bt.h"
24
25 #define VHCI_DEV "/dev/vhci"
26 #define VHCI_UDEV "/dev/hci_vhci"
27
28 struct bt_vhci_s {
29 int fd;
30 struct HCIInfo *info;
31
32 uint8_t hdr[4096];
33 int len;
34 };
35
36 static void vhci_read(void *opaque)
37 {
38 struct bt_vhci_s *s = (struct bt_vhci_s *) opaque;
39 uint8_t *pkt;
40 int pktlen;
41
42 /* Seems that we can't read only the header first and then the amount
43 * of data indicated in the header because Linux will discard everything
44 * that's not been read in one go. */
45 s->len = read(s->fd, s->hdr, sizeof(s->hdr));
46
47 if (s->len < 0) {
48 fprintf(stderr, "qemu: error %i reading the PDU\n", errno);
49 return;
50 }
51
52 pkt = s->hdr;
53 while (s->len --)
54 switch (*pkt ++) {
55 case HCI_COMMAND_PKT:
56 if (s->len < 3)
57 goto bad_pkt;
58
59 pktlen = MIN(pkt[2] + 3, s->len);
60 s->info->cmd_send(s->info, pkt, pktlen);
61 s->len -= pktlen;
62 pkt += pktlen;
63 break;
64
65 case HCI_ACLDATA_PKT:
66 if (s->len < 4)
67 goto bad_pkt;
68
69 pktlen = MIN(((pkt[3] << 8) | pkt[2]) + 4, s->len);
70 s->info->acl_send(s->info, pkt, pktlen);
71 s->len -= pktlen;
72 pkt += pktlen;
73 break;
74
75 case HCI_SCODATA_PKT:
76 if (s->len < 3)
77 goto bad_pkt;
78
79 pktlen = MIN(pkt[2] + 3, s->len);
80 s->info->sco_send(s->info, pkt, pktlen);
81 s->len -= pktlen;
82 pkt += pktlen;
83 break;
84
85 default:
86 bad_pkt:
87 fprintf(stderr, "qemu: bad HCI packet type %02x\n", pkt[-1]);
88 }
89 }
90
91 static void vhci_host_send(void *opaque,
92 int type, const uint8_t *data, int len)
93 {
94 struct bt_vhci_s *s = (struct bt_vhci_s *) opaque;
95 #if 0
96 uint8_t pkt = type;
97 struct iovec iv[2];
98
99 iv[0].iov_base = &pkt;
100 iv[0].iov_len = 1;
101 iv[1].iov_base = (void *) data;
102 iv[1].iov_len = len;
103
104 while (writev(s->fd, iv, 2) < 0)
105 if (errno != EAGAIN && errno != EINTR) {
106 fprintf(stderr, "qemu: error %i writing bluetooth packet.\n",
107 errno);
108 return;
109 }
110 #else
111 /* Apparently VHCI wants us to write everything in one chunk :-( */
112 static uint8_t buf[4096];
113
114 buf[0] = type;
115 memcpy(buf + 1, data, len);
116
117 while (write(s->fd, buf, len + 1) < 0)
118 if (errno != EAGAIN && errno != EINTR) {
119 fprintf(stderr, "qemu: error %i writing bluetooth packet.\n",
120 errno);
121 return;
122 }
123 #endif
124 }
125
126 static void vhci_out_hci_packet_event(void *opaque,
127 const uint8_t *data, int len)
128 {
129 vhci_host_send(opaque, HCI_EVENT_PKT, data, len);
130 }
131
132 static void vhci_out_hci_packet_acl(void *opaque,
133 const uint8_t *data, int len)
134 {
135 vhci_host_send(opaque, HCI_ACLDATA_PKT, data, len);
136 }
137
138 void bt_vhci_init(struct HCIInfo *info)
139 {
140 struct bt_vhci_s *s;
141 int err[2];
142 int fd;
143
144 fd = open(VHCI_DEV, O_RDWR);
145 err[0] = errno;
146 if (fd < 0) {
147 fd = open(VHCI_UDEV, O_RDWR);
148 err[1] = errno;
149 }
150
151 if (fd < 0) {
152 fprintf(stderr, "qemu: Can't open `%s': %s (%i)\n",
153 VHCI_DEV, strerror(err[0]), err[0]);
154 fprintf(stderr, "qemu: Can't open `%s': %s (%i)\n",
155 VHCI_UDEV, strerror(err[1]), err[1]);
156 exit(-1);
157 }
158
159 s = g_malloc0(sizeof(struct bt_vhci_s));
160 s->fd = fd;
161 s->info = info ?: qemu_next_hci();
162 s->info->opaque = s;
163 s->info->evt_recv = vhci_out_hci_packet_event;
164 s->info->acl_recv = vhci_out_hci_packet_acl;
165
166 qemu_set_fd_handler(s->fd, vhci_read, NULL, s);
167 }