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balrogfb599c92008-09-28 23:49:55 +00001/*
2 * Wrap a host Bluetooth HCI socket in a struct HCIInfo.
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 *
aurel32fad6cb12009-01-04 22:05:52 +000016 * You should have received a copy of the GNU General Public License along
Blue Swirl8167ee82009-07-16 20:47:01 +000017 * with this program; if not, see <http://www.gnu.org/licenses/>.
balrogfb599c92008-09-28 23:49:55 +000018 */
19
Peter Maydelld38ea872016-01-29 17:50:05 +000020#include "qemu/osdep.h"
balrogfb599c92008-09-28 23:49:55 +000021#include "qemu-common.h"
Paolo Bonzinidccfcd02013-04-08 16:55:25 +020022#include "sysemu/bt.h"
Paolo Bonzini1de7afc2012-12-17 18:20:00 +010023#include "qemu/main-loop.h"
balrogfb599c92008-09-28 23:49:55 +000024
balrog2e9b08e2008-09-30 23:31:35 +000025#ifndef _WIN32
balrog2e9b08e2008-09-30 23:31:35 +000026# include <sys/ioctl.h>
27# include <sys/uio.h>
28# ifdef CONFIG_BLUEZ
29# include <bluetooth/bluetooth.h>
30# include <bluetooth/hci.h>
31# include <bluetooth/hci_lib.h>
32# else
33# include "hw/bt.h"
34# define HCI_MAX_FRAME_SIZE 1028
35# endif
balrogfb599c92008-09-28 23:49:55 +000036
37struct bt_host_hci_s {
38 struct HCIInfo hci;
39 int fd;
40
41 uint8_t hdr[HCI_MAX_FRAME_SIZE];
42 int len;
43};
44
45static void bt_host_send(struct HCIInfo *hci,
46 int type, const uint8_t *data, int len)
47{
48 struct bt_host_hci_s *s = (struct bt_host_hci_s *) hci;
49 uint8_t pkt = type;
50 struct iovec iv[2];
balrogfb599c92008-09-28 23:49:55 +000051
blueswir13f4cb3d2009-04-13 16:31:01 +000052 iv[0].iov_base = (void *)&pkt;
balrogfb599c92008-09-28 23:49:55 +000053 iv[0].iov_len = 1;
54 iv[1].iov_base = (void *) data;
55 iv[1].iov_len = len;
56
Blue Swirl7300c072010-04-25 18:20:28 +000057 while (writev(s->fd, iv, 2) < 0) {
balrogfb599c92008-09-28 23:49:55 +000058 if (errno != EAGAIN && errno != EINTR) {
59 fprintf(stderr, "qemu: error %i writing bluetooth packet.\n",
60 errno);
61 return;
62 }
Blue Swirl7300c072010-04-25 18:20:28 +000063 }
balrogfb599c92008-09-28 23:49:55 +000064}
65
66static void bt_host_cmd(struct HCIInfo *hci, const uint8_t *data, int len)
67{
68 bt_host_send(hci, HCI_COMMAND_PKT, data, len);
69}
70
71static void bt_host_acl(struct HCIInfo *hci, const uint8_t *data, int len)
72{
73 bt_host_send(hci, HCI_ACLDATA_PKT, data, len);
74}
75
76static void bt_host_sco(struct HCIInfo *hci, const uint8_t *data, int len)
77{
78 bt_host_send(hci, HCI_SCODATA_PKT, data, len);
79}
80
balrogfb599c92008-09-28 23:49:55 +000081static void bt_host_read(void *opaque)
82{
83 struct bt_host_hci_s *s = (struct bt_host_hci_s *) opaque;
84 uint8_t *pkt;
85 int pktlen;
86
87 /* Seems that we can't read only the header first and then the amount
88 * of data indicated in the header because Linux will discard everything
89 * that's not been read in one go. */
90 s->len = read(s->fd, s->hdr, sizeof(s->hdr));
91
92 if (s->len < 0) {
93 fprintf(stderr, "qemu: error %i reading HCI frame\n", errno);
94 return;
95 }
96
97 pkt = s->hdr;
98 while (s->len --)
99 switch (*pkt ++) {
100 case HCI_EVENT_PKT:
101 if (s->len < 2)
102 goto bad_pkt;
103
104 pktlen = MIN(pkt[1] + 2, s->len);
105 s->hci.evt_recv(s->hci.opaque, pkt, pktlen);
106 s->len -= pktlen;
107 pkt += pktlen;
108
109 /* TODO: if this is an Inquiry Result event, it's also
110 * interpreted by Linux kernel before we received it, possibly
111 * we should clean the kernel Inquiry cache through
112 * ioctl(s->fd, HCI_INQUIRY, ...). */
113 break;
114
115 case HCI_ACLDATA_PKT:
116 if (s->len < 4)
117 goto bad_pkt;
118
119 pktlen = MIN(((pkt[3] << 8) | pkt[2]) + 4, s->len);
120 s->hci.acl_recv(s->hci.opaque, pkt, pktlen);
121 s->len -= pktlen;
122 pkt += pktlen;
123 break;
124
125 case HCI_SCODATA_PKT:
126 if (s->len < 3)
127 goto bad_pkt;
128
129 pktlen = MIN(pkt[2] + 3, s->len);
130 s->len -= pktlen;
131 pkt += pktlen;
Stefan Hajnoczif7253272012-01-12 14:17:04 +0000132 break;
balrogfb599c92008-09-28 23:49:55 +0000133
134 default:
135 bad_pkt:
136 fprintf(stderr, "qemu: bad HCI packet type %02x\n", pkt[-1]);
137 }
138}
139
140static int bt_host_bdaddr_set(struct HCIInfo *hci, const uint8_t *bd_addr)
141{
142 return -ENOTSUP;
143}
144
145struct HCIInfo *bt_host_hci(const char *id)
146{
147 struct bt_host_hci_s *s;
148 int fd = -1;
balrog2e9b08e2008-09-30 23:31:35 +0000149# ifdef CONFIG_BLUEZ
balrogfb599c92008-09-28 23:49:55 +0000150 int dev_id = hci_devid(id);
151 struct hci_filter flt;
152
153 if (dev_id < 0) {
154 fprintf(stderr, "qemu: `%s' not available\n", id);
155 return 0;
156 }
157
158 fd = hci_open_dev(dev_id);
159
160 /* XXX: can we ensure nobody else has the device opened? */
balrog2e9b08e2008-09-30 23:31:35 +0000161# endif
balrogfb599c92008-09-28 23:49:55 +0000162
163 if (fd < 0) {
164 fprintf(stderr, "qemu: Can't open `%s': %s (%i)\n",
165 id, strerror(errno), errno);
blueswir1511d2b12009-03-07 15:32:56 +0000166 return NULL;
balrogfb599c92008-09-28 23:49:55 +0000167 }
168
balrog2e9b08e2008-09-30 23:31:35 +0000169# ifdef CONFIG_BLUEZ
balrogfb599c92008-09-28 23:49:55 +0000170 hci_filter_clear(&flt);
171 hci_filter_all_ptypes(&flt);
172 hci_filter_all_events(&flt);
173
Stefan Weil9957fc72013-03-08 19:58:32 +0100174 if (qemu_setsockopt(fd, SOL_HCI, HCI_FILTER, &flt, sizeof(flt)) < 0) {
balrogfb599c92008-09-28 23:49:55 +0000175 fprintf(stderr, "qemu: Can't set HCI filter on socket (%i)\n", errno);
176 return 0;
177 }
balrog2e9b08e2008-09-30 23:31:35 +0000178# endif
balrogfb599c92008-09-28 23:49:55 +0000179
Anthony Liguori7267c092011-08-20 22:09:37 -0500180 s = g_malloc0(sizeof(struct bt_host_hci_s));
balrogfb599c92008-09-28 23:49:55 +0000181 s->fd = fd;
182 s->hci.cmd_send = bt_host_cmd;
183 s->hci.sco_send = bt_host_sco;
184 s->hci.acl_send = bt_host_acl;
185 s->hci.bdaddr_set = bt_host_bdaddr_set;
186
Juan Quintelaca96c312010-03-11 17:55:40 +0100187 qemu_set_fd_handler(s->fd, bt_host_read, NULL, s);
balrogfb599c92008-09-28 23:49:55 +0000188
189 return &s->hci;
190}
balrog2e9b08e2008-09-30 23:31:35 +0000191#else
192struct HCIInfo *bt_host_hci(const char *id)
193{
aurel32978d5d72008-11-06 09:38:51 +0000194 fprintf(stderr, "qemu: bluetooth passthrough not supported (yet)\n");
balrog2e9b08e2008-09-30 23:31:35 +0000195
196 return 0;
197}
198#endif