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363907af PS |
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 | */ | |
4541c561 | 25 | |
363907af PS |
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> | |
a59b968e | 32 | #include <linux/module.h> |
363907af PS |
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; | |
4360fa22 | 54 | int reg_status; |
363907af PS |
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 | */ | |
4360fa22 | 86 | static void st_reg_completion_cb(void *priv_data, int data) |
363907af PS |
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 | |
97 | * available */ | |
98 | static long st_receive(void *priv_data, struct sk_buff *skb) | |
99 | { | |
100 | struct ti_st *lhst = priv_data; | |
101 | int err; | |
102 | ||
103 | if (!skb) | |
104 | return -EFAULT; | |
105 | ||
106 | if (!lhst) { | |
107 | kfree_skb(skb); | |
108 | return -EFAULT; | |
109 | } | |
110 | ||
363907af | 111 | /* Forward skb to HCI core layer */ |
e1a26170 | 112 | err = hci_recv_frame(lhst->hdev, skb); |
363907af PS |
113 | if (err < 0) { |
114 | BT_ERR("Unable to push skb to HCI core(%d)", err); | |
115 | return err; | |
116 | } | |
117 | ||
118 | lhst->hdev->stat.byte_rx += skb->len; | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
123 | /* ------- Interfaces to HCI layer ------ */ | |
124 | /* protocol structure registered with shared transport */ | |
125 | static struct st_proto_s ti_st_proto[MAX_BT_CHNL_IDS] = { | |
8be964d2 CG |
126 | { |
127 | .chnl_id = HCI_EVENT_PKT, /* HCI Events */ | |
128 | .hdr_len = sizeof(struct hci_event_hdr), | |
129 | .offset_len_in_hdr = offsetof(struct hci_event_hdr, plen), | |
130 | .len_size = 1, /* sizeof(plen) in struct hci_event_hdr */ | |
131 | .reserve = 8, | |
132 | }, | |
363907af PS |
133 | { |
134 | .chnl_id = HCI_ACLDATA_PKT, /* ACL */ | |
135 | .hdr_len = sizeof(struct hci_acl_hdr), | |
136 | .offset_len_in_hdr = offsetof(struct hci_acl_hdr, dlen), | |
137 | .len_size = 2, /* sizeof(dlen) in struct hci_acl_hdr */ | |
138 | .reserve = 8, | |
139 | }, | |
140 | { | |
141 | .chnl_id = HCI_SCODATA_PKT, /* SCO */ | |
142 | .hdr_len = sizeof(struct hci_sco_hdr), | |
143 | .offset_len_in_hdr = offsetof(struct hci_sco_hdr, dlen), | |
144 | .len_size = 1, /* sizeof(dlen) in struct hci_sco_hdr */ | |
145 | .reserve = 8, | |
146 | }, | |
363907af PS |
147 | }; |
148 | ||
149 | /* Called from HCI core to initialize the device */ | |
150 | static int ti_st_open(struct hci_dev *hdev) | |
151 | { | |
152 | unsigned long timeleft; | |
153 | struct ti_st *hst; | |
154 | int err, i; | |
155 | ||
156 | BT_DBG("%s %p", hdev->name, hdev); | |
157 | ||
363907af | 158 | /* provide contexts for callbacks from ST */ |
155961e8 | 159 | hst = hci_get_drvdata(hdev); |
363907af PS |
160 | |
161 | for (i = 0; i < MAX_BT_CHNL_IDS; i++) { | |
162 | ti_st_proto[i].priv_data = hst; | |
163 | ti_st_proto[i].max_frame_size = HCI_MAX_FRAME_SIZE; | |
164 | ti_st_proto[i].recv = st_receive; | |
165 | ti_st_proto[i].reg_complete_cb = st_reg_completion_cb; | |
166 | ||
167 | /* Prepare wait-for-completion handler */ | |
168 | init_completion(&hst->wait_reg_completion); | |
169 | /* Reset ST registration callback status flag, | |
170 | * this value will be updated in | |
171 | * st_reg_completion_cb() | |
172 | * function whenever it called from ST driver. | |
173 | */ | |
174 | hst->reg_status = -EINPROGRESS; | |
175 | ||
176 | err = st_register(&ti_st_proto[i]); | |
177 | if (!err) | |
178 | goto done; | |
179 | ||
180 | if (err != -EINPROGRESS) { | |
363907af PS |
181 | BT_ERR("st_register failed %d", err); |
182 | return err; | |
183 | } | |
184 | ||
185 | /* ST is busy with either protocol | |
186 | * registration or firmware download. | |
187 | */ | |
188 | BT_DBG("waiting for registration " | |
189 | "completion signal from ST"); | |
190 | timeleft = wait_for_completion_timeout | |
191 | (&hst->wait_reg_completion, | |
192 | msecs_to_jiffies(BT_REGISTER_TIMEOUT)); | |
193 | if (!timeleft) { | |
363907af PS |
194 | BT_ERR("Timeout(%d sec),didn't get reg " |
195 | "completion signal from ST", | |
196 | BT_REGISTER_TIMEOUT / 1000); | |
197 | return -ETIMEDOUT; | |
198 | } | |
199 | ||
200 | /* Is ST registration callback | |
201 | * called with ERROR status? */ | |
202 | if (hst->reg_status != 0) { | |
363907af PS |
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"); | |
363907af PS |
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; | |
155961e8 | 230 | struct ti_st *hst = hci_get_drvdata(hdev); |
363907af | 231 | |
8be964d2 | 232 | for (i = MAX_BT_CHNL_IDS-1; i >= 0; i--) { |
363907af PS |
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 | ||
7bd8f09f | 244 | static int ti_st_send_frame(struct hci_dev *hdev, struct sk_buff *skb) |
363907af | 245 | { |
363907af PS |
246 | struct ti_st *hst; |
247 | long len; | |
248 | ||
155961e8 | 249 | hst = hci_get_drvdata(hdev); |
363907af PS |
250 | |
251 | /* Prepend skb with frame type */ | |
618e8bc2 | 252 | memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); |
363907af | 253 | |
618e8bc2 MH |
254 | BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb), |
255 | skb->len); | |
363907af PS |
256 | |
257 | /* Insert skb to shared transport layer's transmit queue. | |
258 | * Freeing skb memory is taken care in shared transport layer, | |
259 | * so don't free skb memory here. | |
260 | */ | |
261 | len = hst->st_write(skb); | |
262 | if (len < 0) { | |
263 | kfree_skb(skb); | |
264 | BT_ERR("ST write failed (%ld)", len); | |
265 | /* Try Again, would only fail if UART has gone bad */ | |
266 | return -EAGAIN; | |
267 | } | |
268 | ||
269 | /* ST accepted our skb. So, Go ahead and do rest */ | |
270 | hdev->stat.byte_tx += len; | |
618e8bc2 | 271 | ti_st_tx_complete(hst, hci_skb_pkt_type(skb)); |
363907af PS |
272 | |
273 | return 0; | |
274 | } | |
275 | ||
363907af PS |
276 | static int bt_ti_probe(struct platform_device *pdev) |
277 | { | |
278 | static struct ti_st *hst; | |
279 | struct hci_dev *hdev; | |
280 | int err; | |
281 | ||
4f8d8158 | 282 | hst = devm_kzalloc(&pdev->dev, sizeof(struct ti_st), GFP_KERNEL); |
363907af PS |
283 | if (!hst) |
284 | return -ENOMEM; | |
285 | ||
286 | /* Expose "hciX" device to user space */ | |
287 | hdev = hci_alloc_dev(); | |
4f8d8158 | 288 | if (!hdev) |
363907af | 289 | return -ENOMEM; |
363907af PS |
290 | |
291 | BT_DBG("hdev %p", hdev); | |
292 | ||
293 | hst->hdev = hdev; | |
294 | hdev->bus = HCI_UART; | |
155961e8 | 295 | hci_set_drvdata(hdev, hst); |
363907af PS |
296 | hdev->open = ti_st_open; |
297 | hdev->close = ti_st_close; | |
298 | hdev->flush = NULL; | |
299 | hdev->send = ti_st_send_frame; | |
363907af PS |
300 | |
301 | err = hci_register_dev(hdev); | |
302 | if (err < 0) { | |
303 | BT_ERR("Can't register HCI device error %d", err); | |
363907af PS |
304 | hci_free_dev(hdev); |
305 | return err; | |
306 | } | |
307 | ||
308 | BT_DBG("HCI device registered (hdev %p)", hdev); | |
309 | ||
310 | dev_set_drvdata(&pdev->dev, hst); | |
311 | return err; | |
312 | } | |
313 | ||
314 | static int bt_ti_remove(struct platform_device *pdev) | |
315 | { | |
316 | struct hci_dev *hdev; | |
317 | struct ti_st *hst = dev_get_drvdata(&pdev->dev); | |
318 | ||
319 | if (!hst) | |
320 | return -EFAULT; | |
321 | ||
322 | BT_DBG("%s", hst->hdev->name); | |
323 | ||
324 | hdev = hst->hdev; | |
325 | ti_st_close(hdev); | |
326 | hci_unregister_dev(hdev); | |
327 | ||
328 | hci_free_dev(hdev); | |
363907af PS |
329 | |
330 | dev_set_drvdata(&pdev->dev, NULL); | |
331 | return 0; | |
332 | } | |
333 | ||
334 | static struct platform_driver btwilink_driver = { | |
335 | .probe = bt_ti_probe, | |
336 | .remove = bt_ti_remove, | |
337 | .driver = { | |
338 | .name = "btwilink", | |
363907af PS |
339 | }, |
340 | }; | |
341 | ||
9712ba0b | 342 | module_platform_driver(btwilink_driver); |
363907af PS |
343 | |
344 | /* ------ Module Info ------ */ | |
345 | ||
346 | MODULE_AUTHOR("Raja Mani <raja_mani@ti.com>"); | |
347 | MODULE_DESCRIPTION("Bluetooth Driver for TI Shared Transport" VERSION); | |
348 | MODULE_VERSION(VERSION); | |
349 | MODULE_LICENSE("GPL"); |