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26#include <linux/platform_device.h>
27#include <net/bluetooth/bluetooth.h>
28#include <net/bluetooth/hci_core.h>
29#include <net/bluetooth/hci.h>
30
31#include <linux/ti_wilink_st.h>
32#include <linux/module.h>
33
34
35#define VERSION "1.0"
36#define MAX_BT_CHNL_IDS 3
37
38
39
40
41#define BT_REGISTER_TIMEOUT 6000
42
43
44
45
46
47
48
49
50
51
52struct ti_st {
53 struct hci_dev *hdev;
54 int reg_status;
55 long (*st_write) (struct sk_buff *);
56 struct completion wait_reg_completion;
57};
58
59
60static inline void ti_st_tx_complete(struct ti_st *hst, int pkt_type)
61{
62 struct hci_dev *hdev = hst->hdev;
63
64
65 switch (pkt_type) {
66 case HCI_COMMAND_PKT:
67 hdev->stat.cmd_tx++;
68 break;
69
70 case HCI_ACLDATA_PKT:
71 hdev->stat.acl_tx++;
72 break;
73
74 case HCI_SCODATA_PKT:
75 hdev->stat.sco_tx++;
76 break;
77 }
78}
79
80
81
82
83
84
85
86static void st_reg_completion_cb(void *priv_data, int data)
87{
88 struct ti_st *lhst = priv_data;
89
90
91 lhst->reg_status = data;
92
93 complete(&lhst->wait_reg_completion);
94}
95
96
97static long st_receive(void *priv_data, struct sk_buff *skb)
98{
99 struct ti_st *lhst = priv_data;
100 int err;
101
102 if (!skb)
103 return -EFAULT;
104
105 if (!lhst) {
106 kfree_skb(skb);
107 return -EFAULT;
108 }
109
110
111 err = hci_recv_frame(lhst->hdev, skb);
112 if (err < 0) {
113 BT_ERR("Unable to push skb to HCI core(%d)", err);
114 return err;
115 }
116
117 lhst->hdev->stat.byte_rx += skb->len;
118
119 return 0;
120}
121
122
123
124static struct st_proto_s ti_st_proto[MAX_BT_CHNL_IDS] = {
125 {
126 .chnl_id = HCI_EVENT_PKT,
127 .hdr_len = sizeof(struct hci_event_hdr),
128 .offset_len_in_hdr = offsetof(struct hci_event_hdr, plen),
129 .len_size = 1,
130 .reserve = 8,
131 },
132 {
133 .chnl_id = HCI_ACLDATA_PKT,
134 .hdr_len = sizeof(struct hci_acl_hdr),
135 .offset_len_in_hdr = offsetof(struct hci_acl_hdr, dlen),
136 .len_size = 2,
137 .reserve = 8,
138 },
139 {
140 .chnl_id = HCI_SCODATA_PKT,
141 .hdr_len = sizeof(struct hci_sco_hdr),
142 .offset_len_in_hdr = offsetof(struct hci_sco_hdr, dlen),
143 .len_size = 1,
144 .reserve = 8,
145 },
146};
147
148
149static int ti_st_open(struct hci_dev *hdev)
150{
151 unsigned long timeleft;
152 struct ti_st *hst;
153 int err, i;
154
155 BT_DBG("%s %p", hdev->name, hdev);
156
157
158 hst = hci_get_drvdata(hdev);
159
160 for (i = 0; i < MAX_BT_CHNL_IDS; i++) {
161 ti_st_proto[i].priv_data = hst;
162 ti_st_proto[i].max_frame_size = HCI_MAX_FRAME_SIZE;
163 ti_st_proto[i].recv = st_receive;
164 ti_st_proto[i].reg_complete_cb = st_reg_completion_cb;
165
166
167 init_completion(&hst->wait_reg_completion);
168
169
170
171
172
173 hst->reg_status = -EINPROGRESS;
174
175 err = st_register(&ti_st_proto[i]);
176 if (!err)
177 goto done;
178
179 if (err != -EINPROGRESS) {
180 BT_ERR("st_register failed %d", err);
181 return err;
182 }
183
184
185
186
187 BT_DBG("waiting for registration "
188 "completion signal from ST");
189 timeleft = wait_for_completion_timeout
190 (&hst->wait_reg_completion,
191 msecs_to_jiffies(BT_REGISTER_TIMEOUT));
192 if (!timeleft) {
193 BT_ERR("Timeout(%d sec),didn't get reg "
194 "completion signal from ST",
195 BT_REGISTER_TIMEOUT / 1000);
196 return -ETIMEDOUT;
197 }
198
199
200
201
202 if (hst->reg_status != 0) {
203 BT_ERR("ST registration completed with invalid "
204 "status %d", hst->reg_status);
205 return -EAGAIN;
206 }
207
208done:
209 hst->st_write = ti_st_proto[i].write;
210 if (!hst->st_write) {
211 BT_ERR("undefined ST write function");
212 for (i = 0; i < MAX_BT_CHNL_IDS; i++) {
213
214 err = st_unregister(&ti_st_proto[i]);
215 if (err)
216 BT_ERR("st_unregister() failed with "
217 "error %d", err);
218 hst->st_write = NULL;
219 }
220 return -EIO;
221 }
222 }
223 return 0;
224}
225
226
227static int ti_st_close(struct hci_dev *hdev)
228{
229 int err, i;
230 struct ti_st *hst = hci_get_drvdata(hdev);
231
232 for (i = MAX_BT_CHNL_IDS-1; i >= 0; i--) {
233 err = st_unregister(&ti_st_proto[i]);
234 if (err)
235 BT_ERR("st_unregister(%d) failed with error %d",
236 ti_st_proto[i].chnl_id, err);
237 }
238
239 hst->st_write = NULL;
240
241 return err;
242}
243
244static int ti_st_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
245{
246 struct ti_st *hst;
247 long len;
248 int pkt_type;
249
250 hst = hci_get_drvdata(hdev);
251
252
253 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
254
255 BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb),
256 skb->len);
257
258
259
260
261
262 pkt_type = hci_skb_pkt_type(skb);
263 len = hst->st_write(skb);
264 if (len < 0) {
265 BT_ERR("ST write failed (%ld)", len);
266
267 return -EAGAIN;
268 }
269
270
271 hdev->stat.byte_tx += len;
272 ti_st_tx_complete(hst, pkt_type);
273
274 return 0;
275}
276
277static int bt_ti_probe(struct platform_device *pdev)
278{
279 struct ti_st *hst;
280 struct hci_dev *hdev;
281 int err;
282
283 hst = devm_kzalloc(&pdev->dev, sizeof(struct ti_st), GFP_KERNEL);
284 if (!hst)
285 return -ENOMEM;
286
287
288 hdev = hci_alloc_dev();
289 if (!hdev)
290 return -ENOMEM;
291
292 BT_DBG("hdev %p", hdev);
293
294 hst->hdev = hdev;
295 hdev->bus = HCI_UART;
296 hci_set_drvdata(hdev, hst);
297 hdev->open = ti_st_open;
298 hdev->close = ti_st_close;
299 hdev->flush = NULL;
300 hdev->send = ti_st_send_frame;
301
302 err = hci_register_dev(hdev);
303 if (err < 0) {
304 BT_ERR("Can't register HCI device error %d", err);
305 hci_free_dev(hdev);
306 return err;
307 }
308
309 BT_DBG("HCI device registered (hdev %p)", hdev);
310
311 dev_set_drvdata(&pdev->dev, hst);
312 return 0;
313}
314
315static int bt_ti_remove(struct platform_device *pdev)
316{
317 struct hci_dev *hdev;
318 struct ti_st *hst = dev_get_drvdata(&pdev->dev);
319
320 if (!hst)
321 return -EFAULT;
322
323 BT_DBG("%s", hst->hdev->name);
324
325 hdev = hst->hdev;
326 ti_st_close(hdev);
327 hci_unregister_dev(hdev);
328
329 hci_free_dev(hdev);
330
331 dev_set_drvdata(&pdev->dev, NULL);
332 return 0;
333}
334
335static struct platform_driver btwilink_driver = {
336 .probe = bt_ti_probe,
337 .remove = bt_ti_remove,
338 .driver = {
339 .name = "btwilink",
340 },
341};
342
343module_platform_driver(btwilink_driver);
344
345
346
347MODULE_AUTHOR("Raja Mani <raja_mani@ti.com>");
348MODULE_DESCRIPTION("Bluetooth Driver for TI Shared Transport" VERSION);
349MODULE_VERSION(VERSION);
350MODULE_LICENSE("GPL");
351