2 * Texas Instrument's Bluetooth Driver For Shared Transport.
4 * Bluetooth Driver acts as interface between HCI core and
5 * TI Shared Transport Layer.
7 * Copyright (C) 2009-2010 Texas Instruments
8 * Author: Raja Mani <raja_mani@ti.com>
9 * Pavan Savoy <pavan_savoy@ti.com>
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.
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.
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
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>
31 #include <linux/ti_wilink_st.h>
32 #include <linux/module.h>
34 /* Bluetooth Driver Version */
36 #define MAX_BT_CHNL_IDS 3
38 /* Number of seconds to wait for registration completion
39 * when ST returns PENDING status.
41 #define BT_REGISTER_TIMEOUT 6000 /* 6 sec */
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.
55 long (*st_write) (struct sk_buff *);
56 struct completion wait_reg_completion;
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)
62 struct hci_dev *hdev = hst->hdev;
64 /* Update HCI stat counters */
80 /* ------- Interfaces to Shared Transport ------ */
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.
86 static void st_reg_completion_cb(void *priv_data, char data)
88 struct ti_st *lhst = priv_data;
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);
96 /* Called by Shared Transport layer when receive data is
98 static long st_receive(void *priv_data, struct sk_buff *skb)
100 struct ti_st *lhst = priv_data;
111 /* Forward skb to HCI core layer */
112 err = hci_recv_frame(lhst->hdev, skb);
114 BT_ERR("Unable to push skb to HCI core(%d)", err);
118 lhst->hdev->stat.byte_rx += skb->len;
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] = {
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 */
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 */
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 */
149 /* Called from HCI core to initialize the device */
150 static int ti_st_open(struct hci_dev *hdev)
152 unsigned long timeleft;
156 BT_DBG("%s %p", hdev->name, hdev);
158 if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
161 /* provide contexts for callbacks from ST */
162 hst = hci_get_drvdata(hdev);
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;
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.
177 hst->reg_status = -EINPROGRESS;
179 err = st_register(&ti_st_proto[i]);
183 if (err != -EINPROGRESS) {
184 clear_bit(HCI_RUNNING, &hdev->flags);
185 BT_ERR("st_register failed %d", err);
189 /* ST is busy with either protocol
190 * registration or firmware download.
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));
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);
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);
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]);
223 BT_ERR("st_unregister() failed with "
225 hst->st_write = NULL;
234 static int ti_st_close(struct hci_dev *hdev)
237 struct ti_st *hst = hci_get_drvdata(hdev);
239 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
242 for (i = MAX_BT_CHNL_IDS-1; i >= 0; i--) {
243 err = st_unregister(&ti_st_proto[i]);
245 BT_ERR("st_unregister(%d) failed with error %d",
246 ti_st_proto[i].chnl_id, err);
249 hst->st_write = NULL;
254 static int ti_st_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
259 if (!test_bit(HCI_RUNNING, &hdev->flags))
262 hst = hci_get_drvdata(hdev);
264 /* Prepend skb with frame type */
265 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
267 BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type,
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.
274 len = hst->st_write(skb);
277 BT_ERR("ST write failed (%ld)", len);
278 /* Try Again, would only fail if UART has gone bad */
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);
289 static int bt_ti_probe(struct platform_device *pdev)
291 static struct ti_st *hst;
292 struct hci_dev *hdev;
295 hst = devm_kzalloc(&pdev->dev, sizeof(struct ti_st), GFP_KERNEL);
299 /* Expose "hciX" device to user space */
300 hdev = hci_alloc_dev();
304 BT_DBG("hdev %p", hdev);
307 hdev->bus = HCI_UART;
308 hci_set_drvdata(hdev, hst);
309 hdev->open = ti_st_open;
310 hdev->close = ti_st_close;
312 hdev->send = ti_st_send_frame;
314 err = hci_register_dev(hdev);
316 BT_ERR("Can't register HCI device error %d", err);
321 BT_DBG("HCI device registered (hdev %p)", hdev);
323 dev_set_drvdata(&pdev->dev, hst);
327 static int bt_ti_remove(struct platform_device *pdev)
329 struct hci_dev *hdev;
330 struct ti_st *hst = dev_get_drvdata(&pdev->dev);
335 BT_DBG("%s", hst->hdev->name);
339 hci_unregister_dev(hdev);
343 dev_set_drvdata(&pdev->dev, NULL);
347 static struct platform_driver btwilink_driver = {
348 .probe = bt_ti_probe,
349 .remove = bt_ti_remove,
355 module_platform_driver(btwilink_driver);
357 /* ------ Module Info ------ */
359 MODULE_AUTHOR("Raja Mani <raja_mani@ti.com>");
360 MODULE_DESCRIPTION("Bluetooth Driver for TI Shared Transport" VERSION);
361 MODULE_VERSION(VERSION);
362 MODULE_LICENSE("GPL");