1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
/*
* Copyright (c) 2017 Redpine Signals Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include <linux/unaligned.h>
#include <net/rsi_91x.h>
#define RSI_DMA_ALIGN 8
#define RSI_FRAME_DESC_SIZE 16
#define RSI_HEADROOM_FOR_BT_HAL (RSI_FRAME_DESC_SIZE + RSI_DMA_ALIGN)
struct rsi_hci_adapter {
void *priv;
struct rsi_proto_ops *proto_ops;
struct hci_dev *hdev;
};
static int rsi_hci_open(struct hci_dev *hdev)
{
return 0;
}
static int rsi_hci_close(struct hci_dev *hdev)
{
return 0;
}
static int rsi_hci_flush(struct hci_dev *hdev)
{
return 0;
}
static int rsi_hci_send_pkt(struct hci_dev *hdev, struct sk_buff *skb)
{
struct rsi_hci_adapter *h_adapter = hci_get_drvdata(hdev);
struct sk_buff *new_skb = NULL;
switch (hci_skb_pkt_type(skb)) {
case HCI_COMMAND_PKT:
hdev->stat.cmd_tx++;
break;
case HCI_ACLDATA_PKT:
hdev->stat.acl_tx++;
break;
case HCI_SCODATA_PKT:
hdev->stat.sco_tx++;
break;
}
if (skb_headroom(skb) < RSI_HEADROOM_FOR_BT_HAL) {
/* Insufficient skb headroom - allocate a new skb */
new_skb = skb_realloc_headroom(skb, RSI_HEADROOM_FOR_BT_HAL);
if (unlikely(!new_skb))
return -ENOMEM;
bt_cb(new_skb)->pkt_type = hci_skb_pkt_type(skb);
kfree_skb(skb);
skb = new_skb;
if (!IS_ALIGNED((unsigned long)skb->data, RSI_DMA_ALIGN)) {
u8 *skb_data = skb->data;
int skb_len = skb->len;
skb_push(skb, RSI_DMA_ALIGN);
skb_pull(skb, PTR_ALIGN(skb->data,
RSI_DMA_ALIGN) - skb->data);
memmove(skb->data, skb_data, skb_len);
skb_trim(skb, skb_len);
}
}
return h_adapter->proto_ops->coex_send_pkt(h_adapter->priv, skb,
RSI_BT_Q);
}
static int rsi_hci_recv_pkt(void *priv, const u8 *pkt)
{
struct rsi_hci_adapter *h_adapter = priv;
struct hci_dev *hdev = h_adapter->hdev;
struct sk_buff *skb;
int pkt_len = get_unaligned_le16(pkt) & 0x0fff;
skb = dev_alloc_skb(pkt_len);
if (!skb)
return -ENOMEM;
memcpy(skb->data, pkt + RSI_FRAME_DESC_SIZE, pkt_len);
skb_put(skb, pkt_len);
h_adapter->hdev->stat.byte_rx += skb->len;
hci_skb_pkt_type(skb) = pkt[14];
return hci_recv_frame(hdev, skb);
}
static int rsi_hci_attach(void *priv, struct rsi_proto_ops *ops)
{
struct rsi_hci_adapter *h_adapter = NULL;
struct hci_dev *hdev;
int err = 0;
h_adapter = kzalloc(sizeof(*h_adapter), GFP_KERNEL);
if (!h_adapter)
return -ENOMEM;
h_adapter->priv = priv;
ops->set_bt_context(priv, h_adapter);
h_adapter->proto_ops = ops;
hdev = hci_alloc_dev();
if (!hdev) {
BT_ERR("Failed to alloc HCI device");
goto err;
}
h_adapter->hdev = hdev;
if (ops->get_host_intf(priv) == RSI_HOST_INTF_SDIO)
hdev->bus = HCI_SDIO;
else
hdev->bus = HCI_USB;
hci_set_drvdata(hdev, h_adapter);
hdev->open = rsi_hci_open;
hdev->close = rsi_hci_close;
hdev->flush = rsi_hci_flush;
hdev->send = rsi_hci_send_pkt;
err = hci_register_dev(hdev);
if (err < 0) {
BT_ERR("HCI registration failed with errcode %d", err);
hci_free_dev(hdev);
goto err;
}
return 0;
err:
h_adapter->hdev = NULL;
kfree(h_adapter);
return -EINVAL;
}
static void rsi_hci_detach(void *priv)
{
struct rsi_hci_adapter *h_adapter = priv;
struct hci_dev *hdev;
if (!h_adapter)
return;
hdev = h_adapter->hdev;
if (hdev) {
hci_unregister_dev(hdev);
hci_free_dev(hdev);
h_adapter->hdev = NULL;
}
kfree(h_adapter);
}
const struct rsi_mod_ops rsi_bt_ops = {
.attach = rsi_hci_attach,
.detach = rsi_hci_detach,
.recv_pkt = rsi_hci_recv_pkt,
};
EXPORT_SYMBOL(rsi_bt_ops);
static int rsi_91x_bt_module_init(void)
{
return 0;
}
static void rsi_91x_bt_module_exit(void)
{
return;
}
module_init(rsi_91x_bt_module_init);
module_exit(rsi_91x_bt_module_exit);
MODULE_AUTHOR("Redpine Signals Inc");
MODULE_DESCRIPTION("RSI BT driver");
MODULE_LICENSE("Dual BSD/GPL");
|
