Loading...
Note: File does not exist in v6.8.
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#define DEBUG
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
33/* Bluetooth Driver Version */
34#define VERSION "1.0"
35#define MAX_BT_CHNL_IDS 3
36
37/* Number of seconds to wait for registration completion
38 * when ST returns PENDING status.
39 */
40#define BT_REGISTER_TIMEOUT 6000 /* 6 sec */
41
42/**
43 * struct ti_st - driver operation structure
44 * @hdev: hci device pointer which binds to bt driver
45 * @reg_status: ST registration callback status
46 * @st_write: write function provided by the ST driver
47 * to be used by the driver during send_frame.
48 * @wait_reg_completion - completion sync between ti_st_open
49 * and st_reg_completion_cb.
50 */
51struct ti_st {
52 struct hci_dev *hdev;
53 char reg_status;
54 long (*st_write) (struct sk_buff *);
55 struct completion wait_reg_completion;
56};
57
58/* Increments HCI counters based on pocket ID (cmd,acl,sco) */
59static inline void ti_st_tx_complete(struct ti_st *hst, int pkt_type)
60{
61 struct hci_dev *hdev = hst->hdev;
62
63 /* Update HCI stat counters */
64 switch (pkt_type) {
65 case HCI_COMMAND_PKT:
66 hdev->stat.cmd_tx++;
67 break;
68
69 case HCI_ACLDATA_PKT:
70 hdev->stat.acl_tx++;
71 break;
72
73 case HCI_SCODATA_PKT:
74 hdev->stat.sco_tx++;
75 break;
76 }
77}
78
79/* ------- Interfaces to Shared Transport ------ */
80
81/* Called by ST layer to indicate protocol registration completion
82 * status.ti_st_open() function will wait for signal from this
83 * API when st_register() function returns ST_PENDING.
84 */
85static void st_reg_completion_cb(void *priv_data, char data)
86{
87 struct ti_st *lhst = priv_data;
88
89 /* Save registration status for use in ti_st_open() */
90 lhst->reg_status = data;
91 /* complete the wait in ti_st_open() */
92 complete(&lhst->wait_reg_completion);
93}
94
95/* Called by Shared Transport layer when receive data is
96 * available */
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 skb->dev = (void *) lhst->hdev;
111
112 /* Forward skb to HCI core layer */
113 err = hci_recv_frame(skb);
114 if (err < 0) {
115 BT_ERR("Unable to push skb to HCI core(%d)", err);
116 return err;
117 }
118
119 lhst->hdev->stat.byte_rx += skb->len;
120
121 return 0;
122}
123
124/* ------- Interfaces to HCI layer ------ */
125/* protocol structure registered with shared transport */
126static struct st_proto_s ti_st_proto[MAX_BT_CHNL_IDS] = {
127 {
128 .chnl_id = HCI_EVENT_PKT, /* HCI Events */
129 .hdr_len = sizeof(struct hci_event_hdr),
130 .offset_len_in_hdr = offsetof(struct hci_event_hdr, plen),
131 .len_size = 1, /* sizeof(plen) in struct hci_event_hdr */
132 .reserve = 8,
133 },
134 {
135 .chnl_id = HCI_ACLDATA_PKT, /* ACL */
136 .hdr_len = sizeof(struct hci_acl_hdr),
137 .offset_len_in_hdr = offsetof(struct hci_acl_hdr, dlen),
138 .len_size = 2, /* sizeof(dlen) in struct hci_acl_hdr */
139 .reserve = 8,
140 },
141 {
142 .chnl_id = HCI_SCODATA_PKT, /* SCO */
143 .hdr_len = sizeof(struct hci_sco_hdr),
144 .offset_len_in_hdr = offsetof(struct hci_sco_hdr, dlen),
145 .len_size = 1, /* sizeof(dlen) in struct hci_sco_hdr */
146 .reserve = 8,
147 },
148};
149
150/* Called from HCI core to initialize the device */
151static int ti_st_open(struct hci_dev *hdev)
152{
153 unsigned long timeleft;
154 struct ti_st *hst;
155 int err, i;
156
157 BT_DBG("%s %p", hdev->name, hdev);
158
159 if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
160 return -EBUSY;
161
162 /* provide contexts for callbacks from ST */
163 hst = hdev->driver_data;
164
165 for (i = 0; i < MAX_BT_CHNL_IDS; i++) {
166 ti_st_proto[i].priv_data = hst;
167 ti_st_proto[i].max_frame_size = HCI_MAX_FRAME_SIZE;
168 ti_st_proto[i].recv = st_receive;
169 ti_st_proto[i].reg_complete_cb = st_reg_completion_cb;
170
171 /* Prepare wait-for-completion handler */
172 init_completion(&hst->wait_reg_completion);
173 /* Reset ST registration callback status flag,
174 * this value will be updated in
175 * st_reg_completion_cb()
176 * function whenever it called from ST driver.
177 */
178 hst->reg_status = -EINPROGRESS;
179
180 err = st_register(&ti_st_proto[i]);
181 if (!err)
182 goto done;
183
184 if (err != -EINPROGRESS) {
185 clear_bit(HCI_RUNNING, &hdev->flags);
186 BT_ERR("st_register failed %d", err);
187 return err;
188 }
189
190 /* ST is busy with either protocol
191 * registration or firmware download.
192 */
193 BT_DBG("waiting for registration "
194 "completion signal from ST");
195 timeleft = wait_for_completion_timeout
196 (&hst->wait_reg_completion,
197 msecs_to_jiffies(BT_REGISTER_TIMEOUT));
198 if (!timeleft) {
199 clear_bit(HCI_RUNNING, &hdev->flags);
200 BT_ERR("Timeout(%d sec),didn't get reg "
201 "completion signal from ST",
202 BT_REGISTER_TIMEOUT / 1000);
203 return -ETIMEDOUT;
204 }
205
206 /* Is ST registration callback
207 * called with ERROR status? */
208 if (hst->reg_status != 0) {
209 clear_bit(HCI_RUNNING, &hdev->flags);
210 BT_ERR("ST registration completed with invalid "
211 "status %d", hst->reg_status);
212 return -EAGAIN;
213 }
214
215done:
216 hst->st_write = ti_st_proto[i].write;
217 if (!hst->st_write) {
218 BT_ERR("undefined ST write function");
219 clear_bit(HCI_RUNNING, &hdev->flags);
220 for (i = 0; i < MAX_BT_CHNL_IDS; i++) {
221 /* Undo registration with ST */
222 err = st_unregister(&ti_st_proto[i]);
223 if (err)
224 BT_ERR("st_unregister() failed with "
225 "error %d", err);
226 hst->st_write = NULL;
227 }
228 return -EIO;
229 }
230 }
231 return 0;
232}
233
234/* Close device */
235static int ti_st_close(struct hci_dev *hdev)
236{
237 int err, i;
238 struct ti_st *hst = hdev->driver_data;
239
240 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
241 return 0;
242
243 for (i = MAX_BT_CHNL_IDS-1; i >= 0; i--) {
244 err = st_unregister(&ti_st_proto[i]);
245 if (err)
246 BT_ERR("st_unregister(%d) failed with error %d",
247 ti_st_proto[i].chnl_id, err);
248 }
249
250 hst->st_write = NULL;
251
252 return err;
253}
254
255static int ti_st_send_frame(struct sk_buff *skb)
256{
257 struct hci_dev *hdev;
258 struct ti_st *hst;
259 long len;
260
261 hdev = (struct hci_dev *)skb->dev;
262
263 if (!test_bit(HCI_RUNNING, &hdev->flags))
264 return -EBUSY;
265
266 hst = hdev->driver_data;
267
268 /* Prepend skb with frame type */
269 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
270
271 BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type,
272 skb->len);
273
274 /* Insert skb to shared transport layer's transmit queue.
275 * Freeing skb memory is taken care in shared transport layer,
276 * so don't free skb memory here.
277 */
278 len = hst->st_write(skb);
279 if (len < 0) {
280 kfree_skb(skb);
281 BT_ERR("ST write failed (%ld)", len);
282 /* Try Again, would only fail if UART has gone bad */
283 return -EAGAIN;
284 }
285
286 /* ST accepted our skb. So, Go ahead and do rest */
287 hdev->stat.byte_tx += len;
288 ti_st_tx_complete(hst, bt_cb(skb)->pkt_type);
289
290 return 0;
291}
292
293static void ti_st_destruct(struct hci_dev *hdev)
294{
295 BT_DBG("%s", hdev->name);
296 /* do nothing here, since platform remove
297 * would free the hdev->driver_data
298 */
299}
300
301static int bt_ti_probe(struct platform_device *pdev)
302{
303 static struct ti_st *hst;
304 struct hci_dev *hdev;
305 int err;
306
307 hst = kzalloc(sizeof(struct ti_st), GFP_KERNEL);
308 if (!hst)
309 return -ENOMEM;
310
311 /* Expose "hciX" device to user space */
312 hdev = hci_alloc_dev();
313 if (!hdev) {
314 kfree(hst);
315 return -ENOMEM;
316 }
317
318 BT_DBG("hdev %p", hdev);
319
320 hst->hdev = hdev;
321 hdev->bus = HCI_UART;
322 hdev->driver_data = hst;
323 hdev->open = ti_st_open;
324 hdev->close = ti_st_close;
325 hdev->flush = NULL;
326 hdev->send = ti_st_send_frame;
327 hdev->destruct = ti_st_destruct;
328 hdev->owner = THIS_MODULE;
329
330 err = hci_register_dev(hdev);
331 if (err < 0) {
332 BT_ERR("Can't register HCI device error %d", err);
333 kfree(hst);
334 hci_free_dev(hdev);
335 return err;
336 }
337
338 BT_DBG("HCI device registered (hdev %p)", hdev);
339
340 dev_set_drvdata(&pdev->dev, hst);
341 return err;
342}
343
344static int bt_ti_remove(struct platform_device *pdev)
345{
346 struct hci_dev *hdev;
347 struct ti_st *hst = dev_get_drvdata(&pdev->dev);
348
349 if (!hst)
350 return -EFAULT;
351
352 BT_DBG("%s", hst->hdev->name);
353
354 hdev = hst->hdev;
355 ti_st_close(hdev);
356 hci_unregister_dev(hdev);
357
358 hci_free_dev(hdev);
359 kfree(hst);
360
361 dev_set_drvdata(&pdev->dev, NULL);
362 return 0;
363}
364
365static struct platform_driver btwilink_driver = {
366 .probe = bt_ti_probe,
367 .remove = bt_ti_remove,
368 .driver = {
369 .name = "btwilink",
370 .owner = THIS_MODULE,
371 },
372};
373
374/* ------- Module Init/Exit interfaces ------ */
375static int __init btwilink_init(void)
376{
377 BT_INFO("Bluetooth Driver for TI WiLink - Version %s", VERSION);
378
379 return platform_driver_register(&btwilink_driver);
380}
381
382static void __exit btwilink_exit(void)
383{
384 platform_driver_unregister(&btwilink_driver);
385}
386
387module_init(btwilink_init);
388module_exit(btwilink_exit);
389
390/* ------ Module Info ------ */
391
392MODULE_AUTHOR("Raja Mani <raja_mani@ti.com>");
393MODULE_DESCRIPTION("Bluetooth Driver for TI Shared Transport" VERSION);
394MODULE_VERSION(VERSION);
395MODULE_LICENSE("GPL");