Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/drivers/bluetooth/btwilink.c

  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 #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         char 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, char 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
 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 
111         /* Forward skb to HCI core layer */
112         err = hci_recv_frame(lhst->hdev, skb);
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] = {
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         },
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         },
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 
158         if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
159                 return -EBUSY;
160 
161         /* provide contexts for callbacks from ST */
162         hst = hci_get_drvdata(hdev);
163 
164         for (i = 0; i < MAX_BT_CHNL_IDS; i++) {
165                 ti_st_proto[i].priv_data = hst;
166                 ti_st_proto[i].max_frame_size = HCI_MAX_FRAME_SIZE;
167                 ti_st_proto[i].recv = st_receive;
168                 ti_st_proto[i].reg_complete_cb = st_reg_completion_cb;
169 
170                 /* Prepare wait-for-completion handler */
171                 init_completion(&hst->wait_reg_completion);
172                 /* Reset ST registration callback status flag,
173                  * this value will be updated in
174                  * st_reg_completion_cb()
175                  * function whenever it called from ST driver.
176                  */
177                 hst->reg_status = -EINPROGRESS;
178 
179                 err = st_register(&ti_st_proto[i]);
180                 if (!err)
181                         goto done;
182 
183                 if (err != -EINPROGRESS) {
184                         clear_bit(HCI_RUNNING, &hdev->flags);
185                         BT_ERR("st_register failed %d", err);
186                         return err;
187                 }
188 
189                 /* ST is busy with either protocol
190                  * registration or firmware download.
191                  */
192                 BT_DBG("waiting for registration "
193                                 "completion signal from ST");
194                 timeleft = wait_for_completion_timeout
195                         (&hst->wait_reg_completion,
196                          msecs_to_jiffies(BT_REGISTER_TIMEOUT));
197                 if (!timeleft) {
198                         clear_bit(HCI_RUNNING, &hdev->flags);
199                         BT_ERR("Timeout(%d sec),didn't get reg "
200                                         "completion signal from ST",
201                                         BT_REGISTER_TIMEOUT / 1000);
202                         return -ETIMEDOUT;
203                 }
204 
205                 /* Is ST registration callback
206                  * called with ERROR status? */
207                 if (hst->reg_status != 0) {
208                         clear_bit(HCI_RUNNING, &hdev->flags);
209                         BT_ERR("ST registration completed with invalid "
210                                         "status %d", hst->reg_status);
211                         return -EAGAIN;
212                 }
213 
214 done:
215                 hst->st_write = ti_st_proto[i].write;
216                 if (!hst->st_write) {
217                         BT_ERR("undefined ST write function");
218                         clear_bit(HCI_RUNNING, &hdev->flags);
219                         for (i = 0; i < MAX_BT_CHNL_IDS; i++) {
220                                 /* Undo registration with ST */
221                                 err = st_unregister(&ti_st_proto[i]);
222                                 if (err)
223                                         BT_ERR("st_unregister() failed with "
224                                                         "error %d", err);
225                                 hst->st_write = NULL;
226                         }
227                         return -EIO;
228                 }
229         }
230         return 0;
231 }
232 
233 /* Close device */
234 static int ti_st_close(struct hci_dev *hdev)
235 {
236         int err, i;
237         struct ti_st *hst = hci_get_drvdata(hdev);
238 
239         if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
240                 return 0;
241 
242         for (i = MAX_BT_CHNL_IDS-1; i >= 0; i--) {
243                 err = st_unregister(&ti_st_proto[i]);
244                 if (err)
245                         BT_ERR("st_unregister(%d) failed with error %d",
246                                         ti_st_proto[i].chnl_id, err);
247         }
248 
249         hst->st_write = NULL;
250 
251         return err;
252 }
253 
254 static int ti_st_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
255 {
256         struct ti_st *hst;
257         long len;
258 
259         if (!test_bit(HCI_RUNNING, &hdev->flags))
260                 return -EBUSY;
261 
262         hst = hci_get_drvdata(hdev);
263 
264         /* Prepend skb with frame type */
265         memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
266 
267         BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type,
268                         skb->len);
269 
270         /* Insert skb to shared transport layer's transmit queue.
271          * Freeing skb memory is taken care in shared transport layer,
272          * so don't free skb memory here.
273          */
274         len = hst->st_write(skb);
275         if (len < 0) {
276                 kfree_skb(skb);
277                 BT_ERR("ST write failed (%ld)", len);
278                 /* Try Again, would only fail if UART has gone bad */
279                 return -EAGAIN;
280         }
281 
282         /* ST accepted our skb. So, Go ahead and do rest */
283         hdev->stat.byte_tx += len;
284         ti_st_tx_complete(hst, bt_cb(skb)->pkt_type);
285 
286         return 0;
287 }
288 
289 static int bt_ti_probe(struct platform_device *pdev)
290 {
291         static struct ti_st *hst;
292         struct hci_dev *hdev;
293         int err;
294 
295         hst = devm_kzalloc(&pdev->dev, sizeof(struct ti_st), GFP_KERNEL);
296         if (!hst)
297                 return -ENOMEM;
298 
299         /* Expose "hciX" device to user space */
300         hdev = hci_alloc_dev();
301         if (!hdev)
302                 return -ENOMEM;
303 
304         BT_DBG("hdev %p", hdev);
305 
306         hst->hdev = hdev;
307         hdev->bus = HCI_UART;
308         hci_set_drvdata(hdev, hst);
309         hdev->open = ti_st_open;
310         hdev->close = ti_st_close;
311         hdev->flush = NULL;
312         hdev->send = ti_st_send_frame;
313 
314         err = hci_register_dev(hdev);
315         if (err < 0) {
316                 BT_ERR("Can't register HCI device error %d", err);
317                 hci_free_dev(hdev);
318                 return err;
319         }
320 
321         BT_DBG("HCI device registered (hdev %p)", hdev);
322 
323         dev_set_drvdata(&pdev->dev, hst);
324         return err;
325 }
326 
327 static int bt_ti_remove(struct platform_device *pdev)
328 {
329         struct hci_dev *hdev;
330         struct ti_st *hst = dev_get_drvdata(&pdev->dev);
331 
332         if (!hst)
333                 return -EFAULT;
334 
335         BT_DBG("%s", hst->hdev->name);
336 
337         hdev = hst->hdev;
338         ti_st_close(hdev);
339         hci_unregister_dev(hdev);
340 
341         hci_free_dev(hdev);
342 
343         dev_set_drvdata(&pdev->dev, NULL);
344         return 0;
345 }
346 
347 static struct platform_driver btwilink_driver = {
348         .probe = bt_ti_probe,
349         .remove = bt_ti_remove,
350         .driver = {
351                 .name = "btwilink",
352                 .owner = THIS_MODULE,
353         },
354 };
355 
356 module_platform_driver(btwilink_driver);
357 
358 /* ------ Module Info ------ */
359 
360 MODULE_AUTHOR("Raja Mani <raja_mani@ti.com>");
361 MODULE_DESCRIPTION("Bluetooth Driver for TI Shared Transport" VERSION);
362 MODULE_VERSION(VERSION);
363 MODULE_LICENSE("GPL");
364 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us