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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 
 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
 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         /* provide contexts for callbacks from ST */
159         hst = hci_get_drvdata(hdev);
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) {
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) {
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) {
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                 kfree_skb(skb);
266                 BT_ERR("ST write failed (%ld)", len);
267                 /* Try Again, would only fail if UART has gone bad */
268                 return -EAGAIN;
269         }
270 
271         /* ST accepted our skb. So, Go ahead and do rest */
272         hdev->stat.byte_tx += len;
273         ti_st_tx_complete(hst, pkt_type);
274 
275         return 0;
276 }
277 
278 static int bt_ti_probe(struct platform_device *pdev)
279 {
280         static struct ti_st *hst;
281         struct hci_dev *hdev;
282         int err;
283 
284         hst = devm_kzalloc(&pdev->dev, sizeof(struct ti_st), GFP_KERNEL);
285         if (!hst)
286                 return -ENOMEM;
287 
288         /* Expose "hciX" device to user space */
289         hdev = hci_alloc_dev();
290         if (!hdev)
291                 return -ENOMEM;
292 
293         BT_DBG("hdev %p", hdev);
294 
295         hst->hdev = hdev;
296         hdev->bus = HCI_UART;
297         hci_set_drvdata(hdev, hst);
298         hdev->open = ti_st_open;
299         hdev->close = ti_st_close;
300         hdev->flush = NULL;
301         hdev->send = ti_st_send_frame;
302 
303         err = hci_register_dev(hdev);
304         if (err < 0) {
305                 BT_ERR("Can't register HCI device error %d", err);
306                 hci_free_dev(hdev);
307                 return err;
308         }
309 
310         BT_DBG("HCI device registered (hdev %p)", hdev);
311 
312         dev_set_drvdata(&pdev->dev, hst);
313         return 0;
314 }
315 
316 static int bt_ti_remove(struct platform_device *pdev)
317 {
318         struct hci_dev *hdev;
319         struct ti_st *hst = dev_get_drvdata(&pdev->dev);
320 
321         if (!hst)
322                 return -EFAULT;
323 
324         BT_DBG("%s", hst->hdev->name);
325 
326         hdev = hst->hdev;
327         ti_st_close(hdev);
328         hci_unregister_dev(hdev);
329 
330         hci_free_dev(hdev);
331 
332         dev_set_drvdata(&pdev->dev, NULL);
333         return 0;
334 }
335 
336 static struct platform_driver btwilink_driver = {
337         .probe = bt_ti_probe,
338         .remove = bt_ti_remove,
339         .driver = {
340                 .name = "btwilink",
341         },
342 };
343 
344 module_platform_driver(btwilink_driver);
345 
346 /* ------ Module Info ------ */
347 
348 MODULE_AUTHOR("Raja Mani <raja_mani@ti.com>");
349 MODULE_DESCRIPTION("Bluetooth Driver for TI Shared Transport" VERSION);
350 MODULE_VERSION(VERSION);
351 MODULE_LICENSE("GPL");
352 

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