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_DMA_ALIGN 8
25 #define RSI_FRAME_DESC_SIZE 16
26 #define RSI_HEADROOM_FOR_BT_HAL (RSI_FRAME_DESC_SIZE + RSI_DMA_ALIGN)
27
28 struct rsi_hci_adapter {
29 void *priv;
30 struct rsi_proto_ops *proto_ops;
31 struct hci_dev *hdev;
32 };
33
rsi_hci_open(struct hci_dev * hdev)34 static int rsi_hci_open(struct hci_dev *hdev)
35 {
36 return 0;
37 }
38
rsi_hci_close(struct hci_dev * hdev)39 static int rsi_hci_close(struct hci_dev *hdev)
40 {
41 return 0;
42 }
43
rsi_hci_flush(struct hci_dev * hdev)44 static int rsi_hci_flush(struct hci_dev *hdev)
45 {
46 return 0;
47 }
48
rsi_hci_send_pkt(struct hci_dev * hdev,struct sk_buff * skb)49 static int rsi_hci_send_pkt(struct hci_dev *hdev, struct sk_buff *skb)
50 {
51 struct rsi_hci_adapter *h_adapter = hci_get_drvdata(hdev);
52 struct sk_buff *new_skb = NULL;
53
54 switch (hci_skb_pkt_type(skb)) {
55 case HCI_COMMAND_PKT:
56 hdev->stat.cmd_tx++;
57 break;
58 case HCI_ACLDATA_PKT:
59 hdev->stat.acl_tx++;
60 break;
61 case HCI_SCODATA_PKT:
62 hdev->stat.sco_tx++;
63 break;
64 }
65
66 if (skb_headroom(skb) < RSI_HEADROOM_FOR_BT_HAL) {
67 /* Insufficient skb headroom - allocate a new skb */
68 new_skb = skb_realloc_headroom(skb, RSI_HEADROOM_FOR_BT_HAL);
69 if (unlikely(!new_skb))
70 return -ENOMEM;
71 bt_cb(new_skb)->pkt_type = hci_skb_pkt_type(skb);
72 kfree_skb(skb);
73 skb = new_skb;
74 if (!IS_ALIGNED((unsigned long)skb->data, RSI_DMA_ALIGN)) {
75 u8 *skb_data = skb->data;
76 int skb_len = skb->len;
77
78 skb_push(skb, RSI_DMA_ALIGN);
79 skb_pull(skb, PTR_ALIGN(skb->data,
80 RSI_DMA_ALIGN) - skb->data);
81 memmove(skb->data, skb_data, skb_len);
82 skb_trim(skb, skb_len);
83 }
84 }
85
86 return h_adapter->proto_ops->coex_send_pkt(h_adapter->priv, skb,
87 RSI_BT_Q);
88 }
89
rsi_hci_recv_pkt(void * priv,const u8 * pkt)90 static int rsi_hci_recv_pkt(void *priv, const u8 *pkt)
91 {
92 struct rsi_hci_adapter *h_adapter = priv;
93 struct hci_dev *hdev = h_adapter->hdev;
94 struct sk_buff *skb;
95 int pkt_len = get_unaligned_le16(pkt) & 0x0fff;
96
97 skb = dev_alloc_skb(pkt_len);
98 if (!skb)
99 return -ENOMEM;
100
101 memcpy(skb->data, pkt + RSI_FRAME_DESC_SIZE, pkt_len);
102 skb_put(skb, pkt_len);
103 h_adapter->hdev->stat.byte_rx += skb->len;
104
105 hci_skb_pkt_type(skb) = pkt[14];
106
107 return hci_recv_frame(hdev, skb);
108 }
109
rsi_hci_attach(void * priv,struct rsi_proto_ops * ops)110 static int rsi_hci_attach(void *priv, struct rsi_proto_ops *ops)
111 {
112 struct rsi_hci_adapter *h_adapter = NULL;
113 struct hci_dev *hdev;
114 int err = 0;
115
116 h_adapter = kzalloc(sizeof(*h_adapter), GFP_KERNEL);
117 if (!h_adapter)
118 return -ENOMEM;
119
120 h_adapter->priv = priv;
121 ops->set_bt_context(priv, h_adapter);
122 h_adapter->proto_ops = ops;
123
124 hdev = hci_alloc_dev();
125 if (!hdev) {
126 BT_ERR("Failed to alloc HCI device");
127 goto err;
128 }
129
130 h_adapter->hdev = hdev;
131
132 if (ops->get_host_intf(priv) == RSI_HOST_INTF_SDIO)
133 hdev->bus = HCI_SDIO;
134 else
135 hdev->bus = HCI_USB;
136
137 hci_set_drvdata(hdev, h_adapter);
138 hdev->dev_type = HCI_PRIMARY;
139 hdev->open = rsi_hci_open;
140 hdev->close = rsi_hci_close;
141 hdev->flush = rsi_hci_flush;
142 hdev->send = rsi_hci_send_pkt;
143
144 err = hci_register_dev(hdev);
145 if (err < 0) {
146 BT_ERR("HCI registration failed with errcode %d", err);
147 hci_free_dev(hdev);
148 goto err;
149 }
150
151 return 0;
152 err:
153 h_adapter->hdev = NULL;
154 kfree(h_adapter);
155 return -EINVAL;
156 }
157
rsi_hci_detach(void * priv)158 static void rsi_hci_detach(void *priv)
159 {
160 struct rsi_hci_adapter *h_adapter = priv;
161 struct hci_dev *hdev;
162
163 if (!h_adapter)
164 return;
165
166 hdev = h_adapter->hdev;
167 if (hdev) {
168 hci_unregister_dev(hdev);
169 hci_free_dev(hdev);
170 h_adapter->hdev = NULL;
171 }
172
173 kfree(h_adapter);
174 }
175
176 const struct rsi_mod_ops rsi_bt_ops = {
177 .attach = rsi_hci_attach,
178 .detach = rsi_hci_detach,
179 .recv_pkt = rsi_hci_recv_pkt,
180 };
181 EXPORT_SYMBOL(rsi_bt_ops);
182
rsi_91x_bt_module_init(void)183 static int rsi_91x_bt_module_init(void)
184 {
185 return 0;
186 }
187
rsi_91x_bt_module_exit(void)188 static void rsi_91x_bt_module_exit(void)
189 {
190 return;
191 }
192
193 module_init(rsi_91x_bt_module_init);
194 module_exit(rsi_91x_bt_module_exit);
195 MODULE_AUTHOR("Redpine Signals Inc");
196 MODULE_DESCRIPTION("RSI BT driver");
197 MODULE_SUPPORTED_DEVICE("RSI-BT");
198 MODULE_LICENSE("Dual BSD/GPL");
199