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186 lines · 3.8 KiB

1// SPDX-License-Identifier: ISC
2/*
3 * Copyright (c) 2017 Redpine Signals Inc.
4 *
5 */
6#include <linux/module.h>
7#include <linux/kernel.h>
8#include <net/bluetooth/bluetooth.h>
9#include <net/bluetooth/hci_core.h>
10#include <linux/unaligned.h>
11#include <net/rsi_91x.h>
12
13#define RSI_DMA_ALIGN 8
14#define RSI_FRAME_DESC_SIZE 16
15#define RSI_HEADROOM_FOR_BT_HAL (RSI_FRAME_DESC_SIZE + RSI_DMA_ALIGN)
16
17struct rsi_hci_adapter {
18 void *priv;
19 struct rsi_proto_ops *proto_ops;
20 struct hci_dev *hdev;
21};
22
23static int rsi_hci_open(struct hci_dev *hdev)
24{
25 return 0;
26}
27
28static int rsi_hci_close(struct hci_dev *hdev)
29{
30 return 0;
31}
32
33static int rsi_hci_flush(struct hci_dev *hdev)
34{
35 return 0;
36}
37
38static int rsi_hci_send_pkt(struct hci_dev *hdev, struct sk_buff *skb)
39{
40 struct rsi_hci_adapter *h_adapter = hci_get_drvdata(hdev);
41 struct sk_buff *new_skb = NULL;
42
43 switch (hci_skb_pkt_type(skb)) {
44 case HCI_COMMAND_PKT:
45 hdev->stat.cmd_tx++;
46 break;
47 case HCI_ACLDATA_PKT:
48 hdev->stat.acl_tx++;
49 break;
50 case HCI_SCODATA_PKT:
51 hdev->stat.sco_tx++;
52 break;
53 }
54
55 if (skb_headroom(skb) < RSI_HEADROOM_FOR_BT_HAL) {
56 /* Insufficient skb headroom - allocate a new skb */
57 new_skb = skb_realloc_headroom(skb, RSI_HEADROOM_FOR_BT_HAL);
58 if (unlikely(!new_skb))
59 return -ENOMEM;
60 bt_cb(new_skb)->pkt_type = hci_skb_pkt_type(skb);
61 kfree_skb(skb);
62 skb = new_skb;
63 if (!IS_ALIGNED((unsigned long)skb->data, RSI_DMA_ALIGN)) {
64 u8 *skb_data = skb->data;
65 int skb_len = skb->len;
66
67 skb_push(skb, RSI_DMA_ALIGN);
68 skb_pull(skb, PTR_ALIGN(skb->data,
69 RSI_DMA_ALIGN) - skb->data);
70 memmove(skb->data, skb_data, skb_len);
71 skb_trim(skb, skb_len);
72 }
73 }
74
75 return h_adapter->proto_ops->coex_send_pkt(h_adapter->priv, skb,
76 RSI_BT_Q);
77}
78
79static int rsi_hci_recv_pkt(void *priv, const u8 *pkt)
80{
81 struct rsi_hci_adapter *h_adapter = priv;
82 struct hci_dev *hdev = h_adapter->hdev;
83 struct sk_buff *skb;
84 int pkt_len = get_unaligned_le16(pkt) & 0x0fff;
85
86 skb = dev_alloc_skb(pkt_len);
87 if (!skb)
88 return -ENOMEM;
89
90 memcpy(skb->data, pkt + RSI_FRAME_DESC_SIZE, pkt_len);
91 skb_put(skb, pkt_len);
92 h_adapter->hdev->stat.byte_rx += skb->len;
93
94 hci_skb_pkt_type(skb) = pkt[14];
95
96 return hci_recv_frame(hdev, skb);
97}
98
99static int rsi_hci_attach(void *priv, struct rsi_proto_ops *ops)
100{
101 struct rsi_hci_adapter *h_adapter = NULL;
102 struct hci_dev *hdev;
103 int err = 0;
104
105 h_adapter = kzalloc_obj(*h_adapter);
106 if (!h_adapter)
107 return -ENOMEM;
108
109 h_adapter->priv = priv;
110 h_adapter->proto_ops = ops;
111
112 hdev = hci_alloc_dev();
113 if (!hdev) {
114 BT_ERR("Failed to alloc HCI device");
115 goto err;
116 }
117
118 h_adapter->hdev = hdev;
119
120 if (ops->get_host_intf(priv) == RSI_HOST_INTF_SDIO)
121 hdev->bus = HCI_SDIO;
122 else
123 hdev->bus = HCI_USB;
124
125 hci_set_drvdata(hdev, h_adapter);
126 hdev->open = rsi_hci_open;
127 hdev->close = rsi_hci_close;
128 hdev->flush = rsi_hci_flush;
129 hdev->send = rsi_hci_send_pkt;
130
131 err = hci_register_dev(hdev);
132 if (err < 0) {
133 BT_ERR("HCI registration failed with errcode %d", err);
134 hci_free_dev(hdev);
135 goto err;
136 }
137
138 ops->set_bt_context(priv, h_adapter);
139
140 return 0;
141err:
142 h_adapter->hdev = NULL;
143 kfree(h_adapter);
144 return -EINVAL;
145}
146
147static void rsi_hci_detach(void *priv)
148{
149 struct rsi_hci_adapter *h_adapter = priv;
150 struct hci_dev *hdev;
151
152 if (!h_adapter)
153 return;
154
155 hdev = h_adapter->hdev;
156 if (hdev) {
157 hci_unregister_dev(hdev);
158 hci_free_dev(hdev);
159 h_adapter->hdev = NULL;
160 }
161
162 kfree(h_adapter);
163}
164
165const struct rsi_mod_ops rsi_bt_ops = {
166 .attach = rsi_hci_attach,
167 .detach = rsi_hci_detach,
168 .recv_pkt = rsi_hci_recv_pkt,
169};
170EXPORT_SYMBOL(rsi_bt_ops);
171
172static int rsi_91x_bt_module_init(void)
173{
174 return 0;
175}
176
177static void rsi_91x_bt_module_exit(void)
178{
179 return;
180}
181
182module_init(rsi_91x_bt_module_init);
183module_exit(rsi_91x_bt_module_exit);
184MODULE_AUTHOR("Redpine Signals Inc");
185MODULE_DESCRIPTION("RSI BT driver");
186MODULE_LICENSE("Dual BSD/GPL");