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