1 | /* |
2 | * Texas Instrument's Bluetooth Driver For Shared Transport. |
3 | * |
4 | * Bluetooth Driver acts as interface between HCI core and |
5 | * TI Shared Transport Layer. |
6 | * |
7 | * Copyright (C) 2009-2010 Texas Instruments |
8 | * Author: Raja Mani <raja_mani@ti.com> |
9 | * Pavan Savoy <pavan_savoy@ti.com> |
10 | * |
11 | * This program is free software; you can redistribute it and/or modify |
12 | * it under the terms of the GNU General Public License version 2 as |
13 | * published by the Free Software Foundation. |
14 | * |
15 | * This program is distributed in the hope that it will be useful, |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
18 | * GNU General Public License for more details. |
19 | * |
20 | * You should have received a copy of the GNU General Public License |
21 | * along with this program; if not, write to the Free Software |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
23 | * |
24 | */ |
25 | |
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 | /* Bluetooth Driver Version */ |
35 | #define VERSION "1.0" |
36 | #define MAX_BT_CHNL_IDS 3 |
37 | |
38 | /* Number of seconds to wait for registration completion |
39 | * when ST returns PENDING status. |
40 | */ |
41 | #define BT_REGISTER_TIMEOUT 6000 /* 6 sec */ |
42 | |
43 | /** |
44 | * struct ti_st - driver operation structure |
45 | * @hdev: hci device pointer which binds to bt driver |
46 | * @reg_status: ST registration callback status |
47 | * @st_write: write function provided by the ST driver |
48 | * to be used by the driver during send_frame. |
49 | * @wait_reg_completion - completion sync between ti_st_open |
50 | * and st_reg_completion_cb. |
51 | */ |
52 | struct 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 | /* Increments HCI counters based on pocket ID (cmd,acl,sco) */ |
60 | static inline void ti_st_tx_complete(struct ti_st *hst, int pkt_type) |
61 | { |
62 | struct hci_dev *hdev = hst->hdev; |
63 | |
64 | /* Update HCI stat counters */ |
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 | /* ------- Interfaces to Shared Transport ------ */ |
81 | |
82 | /* Called by ST layer to indicate protocol registration completion |
83 | * status.ti_st_open() function will wait for signal from this |
84 | * API when st_register() function returns ST_PENDING. |
85 | */ |
86 | static void st_reg_completion_cb(void *priv_data, int data) |
87 | { |
88 | struct ti_st *lhst = priv_data; |
89 | |
90 | /* Save registration status for use in ti_st_open() */ |
91 | lhst->reg_status = data; |
92 | /* complete the wait in ti_st_open() */ |
93 | complete(&lhst->wait_reg_completion); |
94 | } |
95 | |
96 | /* Called by Shared Transport layer when receive data is available */ |
97 | static 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 | /* Forward skb to HCI core layer */ |
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 | /* ------- Interfaces to HCI layer ------ */ |
123 | /* protocol structure registered with shared transport */ |
124 | static struct st_proto_s ti_st_proto[MAX_BT_CHNL_IDS] = { |
125 | { |
126 | .chnl_id = HCI_EVENT_PKT, /* HCI Events */ |
127 | .hdr_len = sizeof(struct hci_event_hdr), |
128 | .offset_len_in_hdr = offsetof(struct hci_event_hdr, plen), |
129 | .len_size = 1, /* sizeof(plen) in struct hci_event_hdr */ |
130 | .reserve = 8, |
131 | }, |
132 | { |
133 | .chnl_id = HCI_ACLDATA_PKT, /* ACL */ |
134 | .hdr_len = sizeof(struct hci_acl_hdr), |
135 | .offset_len_in_hdr = offsetof(struct hci_acl_hdr, dlen), |
136 | .len_size = 2, /* sizeof(dlen) in struct hci_acl_hdr */ |
137 | .reserve = 8, |
138 | }, |
139 | { |
140 | .chnl_id = HCI_SCODATA_PKT, /* SCO */ |
141 | .hdr_len = sizeof(struct hci_sco_hdr), |
142 | .offset_len_in_hdr = offsetof(struct hci_sco_hdr, dlen), |
143 | .len_size = 1, /* sizeof(dlen) in struct hci_sco_hdr */ |
144 | .reserve = 8, |
145 | }, |
146 | }; |
147 | |
148 | /* Called from HCI core to initialize the device */ |
149 | static 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 | /* provide contexts for callbacks from ST */ |
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 | /* Prepare wait-for-completion handler */ |
167 | init_completion(&hst->wait_reg_completion); |
168 | /* Reset ST registration callback status flag, |
169 | * this value will be updated in |
170 | * st_reg_completion_cb() |
171 | * function whenever it called from ST driver. |
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 | /* ST is busy with either protocol |
185 | * registration or firmware download. |
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 | /* Is ST registration callback |
200 | * called with ERROR status? |
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 | |
208 | done: |
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 | /* Undo registration with ST */ |
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 | /* Close device */ |
227 | static 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 | |
244 | static 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 | /* Prepend skb with frame type */ |
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 | /* Insert skb to shared transport layer's transmit queue. |
259 | * Freeing skb memory is taken care in shared transport layer, |
260 | * so don't free skb memory here. |
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 | /* Try Again, would only fail if UART has gone bad */ |
267 | return -EAGAIN; |
268 | } |
269 | |
270 | /* ST accepted our skb. So, Go ahead and do rest */ |
271 | hdev->stat.byte_tx += len; |
272 | ti_st_tx_complete(hst, pkt_type); |
273 | |
274 | return 0; |
275 | } |
276 | |
277 | static 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 | /* Expose "hciX" device to user space */ |
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 | |
315 | static 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 | |
335 | static struct platform_driver btwilink_driver = { |
336 | .probe = bt_ti_probe, |
337 | .remove = bt_ti_remove, |
338 | .driver = { |
339 | .name = "btwilink" , |
340 | }, |
341 | }; |
342 | |
343 | module_platform_driver(btwilink_driver); |
344 | |
345 | /* ------ Module Info ------ */ |
346 | |
347 | MODULE_AUTHOR("Raja Mani <raja_mani@ti.com>" ); |
348 | MODULE_DESCRIPTION("Bluetooth Driver for TI Shared Transport" VERSION); |
349 | MODULE_VERSION(VERSION); |
350 | MODULE_LICENSE("GPL" ); |
351 | |