Emulate a USB bluetooth dongle (or HCI Transport layer).
[qemu/mini2440/sniper_sniper_test.git] / bt-vhci.c
blob146939313d59cae23cf2017c834af512326f3bef
1 /*
2 * Support for host VHCIs inside qemu scatternets.
4 * Copyright (C) 2008 Andrzej Zaborowski <balrog@zabor.org>
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.
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.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
19 * MA 02111-1307 USA
22 #include "qemu-common.h"
23 #include "qemu-char.h"
24 #include "sysemu.h"
25 #include "net.h"
26 #include "hw/bt.h"
28 #include <sys/uio.h>
30 #define VHCI_DEV "/dev/vhci"
31 #define VHCI_UDEV "/dev/hci_vhci"
33 struct bt_vhci_s {
34 int fd;
35 struct HCIInfo *info;
37 uint8_t hdr[4096];
38 int len;
41 static void vhci_read(void *opaque)
43 struct bt_vhci_s *s = (struct bt_vhci_s *) opaque;
44 uint8_t *pkt;
45 int pktlen;
47 /* Seems that we can't read only the header first and then the amount
48 * of data indicated in the header because Linux will discard everything
49 * that's not been read in one go. */
50 s->len = read(s->fd, s->hdr, sizeof(s->hdr));
52 if (s->len < 0) {
53 fprintf(stderr, "qemu: error %i reading the PDU\n", errno);
54 return;
57 pkt = s->hdr;
58 while (s->len --)
59 switch (*pkt ++) {
60 case HCI_COMMAND_PKT:
61 if (s->len < 3)
62 goto bad_pkt;
64 pktlen = MIN(pkt[2] + 3, s->len);
65 s->info->cmd_send(s->info, pkt, pktlen);
66 s->len -= pktlen;
67 pkt += pktlen;
68 break;
70 case HCI_ACLDATA_PKT:
71 if (s->len < 4)
72 goto bad_pkt;
74 pktlen = MIN(((pkt[3] << 8) | pkt[2]) + 4, s->len);
75 s->info->acl_send(s->info, pkt, pktlen);
76 s->len -= pktlen;
77 pkt += pktlen;
78 break;
80 case HCI_SCODATA_PKT:
81 if (s->len < 3)
82 goto bad_pkt;
84 pktlen = MIN(pkt[2] + 3, s->len);
85 s->info->sco_send(s->info, pkt, pktlen);
86 s->len -= pktlen;
87 pkt += pktlen;
88 break;
90 default:
91 bad_pkt:
92 fprintf(stderr, "qemu: bad HCI packet type %02x\n", pkt[-1]);
96 static void vhci_host_send(void *opaque,
97 int type, const uint8_t *data, int len)
99 struct bt_vhci_s *s = (struct bt_vhci_s *) opaque;
100 #if 0
101 uint8_t pkt = type;
102 struct iovec iv[2];
104 iv[0].iov_base = &pkt;
105 iv[0].iov_len = 1;
106 iv[1].iov_base = (void *) data;
107 iv[1].iov_len = len;
109 while (writev(s->fd, iv, 2) < 0)
110 if (errno != EAGAIN && errno != EINTR) {
111 fprintf(stderr, "qemu: error %i writing bluetooth packet.\n",
112 errno);
113 return;
115 #else
116 /* Apparently VHCI wants us to write everything in one chunk :-( */
117 static uint8_t buf[4096];
119 buf[0] = type;
120 memcpy(buf + 1, data, len);
122 while (write(s->fd, buf, len + 1) < 0)
123 if (errno != EAGAIN && errno != EINTR) {
124 fprintf(stderr, "qemu: error %i writing bluetooth packet.\n",
125 errno);
126 return;
128 #endif
131 static void vhci_out_hci_packet_event(void *opaque,
132 const uint8_t *data, int len)
134 vhci_host_send(opaque, HCI_EVENT_PKT, data, len);
137 static void vhci_out_hci_packet_acl(void *opaque,
138 const uint8_t *data, int len)
140 vhci_host_send(opaque, HCI_ACLDATA_PKT, data, len);
143 void bt_vhci_init(struct HCIInfo *info)
145 struct bt_vhci_s *s;
146 int err[2];
147 int fd;
149 fd = open(VHCI_DEV, O_RDWR);
150 err[0] = errno;
151 if (fd < 0) {
152 fd = open(VHCI_UDEV, O_RDWR);
153 err[1] = errno;
156 if (fd < 0) {
157 fprintf(stderr, "qemu: Can't open `%s': %s (%i)\n",
158 VHCI_DEV, strerror(err[0]), err[0]);
159 fprintf(stderr, "qemu: Can't open `%s': %s (%i)\n",
160 VHCI_UDEV, strerror(err[1]), err[1]);
161 exit(-1);
164 s = qemu_mallocz(sizeof(struct bt_vhci_s));
165 s->fd = fd;
166 s->info = info ?: qemu_next_hci();
167 s->info->opaque = s;
168 s->info->evt_recv = vhci_out_hci_packet_event;
169 s->info->acl_recv = vhci_out_hci_packet_acl;
171 qemu_set_fd_handler(s->fd, vhci_read, 0, s);