Commit | Line | Data |
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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 | ||
d98422cb | 96 | /* Called by Shared Transport layer when receive data is available */ |
363907af PS |
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 | ||
363907af | 110 | /* Forward skb to HCI core layer */ |
e1a26170 | 111 | err = hci_recv_frame(lhst->hdev, skb); |
363907af PS |
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] = { | |
8be964d2 CG |
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 | }, | |
363907af PS |
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 | }, | |
363907af PS |
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 | ||
363907af | 157 | /* provide contexts for callbacks from ST */ |
155961e8 | 158 | hst = hci_get_drvdata(hdev); |
363907af PS |
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) { | |
363907af PS |
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) { | |
363907af PS |
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 | |
d98422cb DR |
200 | * called with ERROR status? |
201 | */ | |
363907af | 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; | |
acf91ec3 | 248 | int pkt_type; |
363907af | 249 | |
155961e8 | 250 | hst = hci_get_drvdata(hdev); |
363907af PS |
251 | |
252 | /* Prepend skb with frame type */ | |
618e8bc2 | 253 | memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); |
363907af | 254 | |
618e8bc2 MH |
255 | BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb), |
256 | skb->len); | |
363907af PS |
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 | */ | |
acf91ec3 | 262 | pkt_type = hci_skb_pkt_type(skb); |
363907af PS |
263 | len = hst->st_write(skb); |
264 | if (len < 0) { | |
363907af PS |
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; | |
acf91ec3 | 272 | ti_st_tx_complete(hst, pkt_type); |
363907af PS |
273 | |
274 | return 0; | |
275 | } | |
276 | ||
363907af PS |
277 | static int bt_ti_probe(struct platform_device *pdev) |
278 | { | |
1d609dd3 | 279 | struct ti_st *hst; |
363907af PS |
280 | struct hci_dev *hdev; |
281 | int err; | |
282 | ||
4f8d8158 | 283 | hst = devm_kzalloc(&pdev->dev, sizeof(struct ti_st), GFP_KERNEL); |
363907af PS |
284 | if (!hst) |
285 | return -ENOMEM; | |
286 | ||
287 | /* Expose "hciX" device to user space */ | |
288 | hdev = hci_alloc_dev(); | |
4f8d8158 | 289 | if (!hdev) |
363907af | 290 | return -ENOMEM; |
363907af PS |
291 | |
292 | BT_DBG("hdev %p", hdev); | |
293 | ||
294 | hst->hdev = hdev; | |
295 | hdev->bus = HCI_UART; | |
155961e8 | 296 | hci_set_drvdata(hdev, hst); |
363907af PS |
297 | hdev->open = ti_st_open; |
298 | hdev->close = ti_st_close; | |
299 | hdev->flush = NULL; | |
300 | hdev->send = ti_st_send_frame; | |
363907af PS |
301 | |
302 | err = hci_register_dev(hdev); | |
303 | if (err < 0) { | |
304 | BT_ERR("Can't register HCI device error %d", err); | |
363907af PS |
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); | |
6add49ff | 312 | return 0; |
363907af PS |
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); | |
363907af PS |
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", | |
363907af PS |
340 | }, |
341 | }; | |
342 | ||
9712ba0b | 343 | module_platform_driver(btwilink_driver); |
363907af PS |
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"); |