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Don't wrap I2C registers addresses on PXA270.
[qemu.git] / bt-vhci.c
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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
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
20 */
21
22#include "qemu-common.h"
23#include "qemu-char.h"
24#include "sysemu.h"
25#include "net.h"
26#include "hw/bt.h"
27
2e9b08e5 28#define VHCI_DEV "/dev/vhci"
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29#define VHCI_UDEV "/dev/hci_vhci"
30
31struct bt_vhci_s {
32 int fd;
33 struct HCIInfo *info;
34
35 uint8_t hdr[4096];
36 int len;
37};
38
39static void vhci_read(void *opaque)
40{
41 struct bt_vhci_s *s = (struct bt_vhci_s *) opaque;
42 uint8_t *pkt;
43 int pktlen;
44
45 /* Seems that we can't read only the header first and then the amount
46 * of data indicated in the header because Linux will discard everything
47 * that's not been read in one go. */
48 s->len = read(s->fd, s->hdr, sizeof(s->hdr));
49
50 if (s->len < 0) {
51 fprintf(stderr, "qemu: error %i reading the PDU\n", errno);
52 return;
53 }
54
55 pkt = s->hdr;
56 while (s->len --)
57 switch (*pkt ++) {
58 case HCI_COMMAND_PKT:
59 if (s->len < 3)
60 goto bad_pkt;
61
62 pktlen = MIN(pkt[2] + 3, s->len);
63 s->info->cmd_send(s->info, pkt, pktlen);
64 s->len -= pktlen;
65 pkt += pktlen;
66 break;
67
68 case HCI_ACLDATA_PKT:
69 if (s->len < 4)
70 goto bad_pkt;
71
72 pktlen = MIN(((pkt[3] << 8) | pkt[2]) + 4, s->len);
73 s->info->acl_send(s->info, pkt, pktlen);
74 s->len -= pktlen;
75 pkt += pktlen;
76 break;
77
78 case HCI_SCODATA_PKT:
79 if (s->len < 3)
80 goto bad_pkt;
81
82 pktlen = MIN(pkt[2] + 3, s->len);
83 s->info->sco_send(s->info, pkt, pktlen);
84 s->len -= pktlen;
85 pkt += pktlen;
86 break;
87
88 default:
89 bad_pkt:
90 fprintf(stderr, "qemu: bad HCI packet type %02x\n", pkt[-1]);
91 }
92}
93
94static void vhci_host_send(void *opaque,
95 int type, const uint8_t *data, int len)
96{
97 struct bt_vhci_s *s = (struct bt_vhci_s *) opaque;
98#if 0
99 uint8_t pkt = type;
100 struct iovec iv[2];
101
102 iv[0].iov_base = &pkt;
103 iv[0].iov_len = 1;
104 iv[1].iov_base = (void *) data;
105 iv[1].iov_len = len;
106
107 while (writev(s->fd, iv, 2) < 0)
108 if (errno != EAGAIN && errno != EINTR) {
109 fprintf(stderr, "qemu: error %i writing bluetooth packet.\n",
110 errno);
111 return;
112 }
113#else
114 /* Apparently VHCI wants us to write everything in one chunk :-( */
115 static uint8_t buf[4096];
116
117 buf[0] = type;
118 memcpy(buf + 1, data, len);
119
120 while (write(s->fd, buf, len + 1) < 0)
121 if (errno != EAGAIN && errno != EINTR) {
122 fprintf(stderr, "qemu: error %i writing bluetooth packet.\n",
123 errno);
124 return;
125 }
126#endif
127}
128
129static void vhci_out_hci_packet_event(void *opaque,
130 const uint8_t *data, int len)
131{
132 vhci_host_send(opaque, HCI_EVENT_PKT, data, len);
133}
134
135static void vhci_out_hci_packet_acl(void *opaque,
136 const uint8_t *data, int len)
137{
138 vhci_host_send(opaque, HCI_ACLDATA_PKT, data, len);
139}
140
141void bt_vhci_init(struct HCIInfo *info)
142{
143 struct bt_vhci_s *s;
144 int err[2];
145 int fd;
146
147 fd = open(VHCI_DEV, O_RDWR);
148 err[0] = errno;
149 if (fd < 0) {
150 fd = open(VHCI_UDEV, O_RDWR);
151 err[1] = errno;
152 }
153
154 if (fd < 0) {
155 fprintf(stderr, "qemu: Can't open `%s': %s (%i)\n",
156 VHCI_DEV, strerror(err[0]), err[0]);
157 fprintf(stderr, "qemu: Can't open `%s': %s (%i)\n",
158 VHCI_UDEV, strerror(err[1]), err[1]);
159 exit(-1);
160 }
161
162 s = qemu_mallocz(sizeof(struct bt_vhci_s));
163 s->fd = fd;
164 s->info = info ?: qemu_next_hci();
165 s->info->opaque = s;
166 s->info->evt_recv = vhci_out_hci_packet_event;
167 s->info->acl_recv = vhci_out_hci_packet_acl;
168
169 qemu_set_fd_handler(s->fd, vhci_read, 0, s);
170}