bpa10x.c 14 KB

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  1. /*
  2. *
  3. * Digianswer Bluetooth USB driver
  4. *
  5. * Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org>
  6. *
  7. *
  8. * This program is free software; you can redistribute it and/or modify
  9. * it under the terms of the GNU General Public License as published by
  10. * the Free Software Foundation; either version 2 of the License, or
  11. * (at your option) any later version.
  12. *
  13. * This program is distributed in the hope that it will be useful,
  14. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16. * GNU General Public License for more details.
  17. *
  18. * You should have received a copy of the GNU General Public License
  19. * along with this program; if not, write to the Free Software
  20. * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21. *
  22. */
  23. #include <linux/module.h>
  24. #include <linux/kernel.h>
  25. #include <linux/init.h>
  26. #include <linux/slab.h>
  27. #include <linux/types.h>
  28. #include <linux/errno.h>
  29. #include <linux/usb.h>
  30. #include <net/bluetooth/bluetooth.h>
  31. #include <net/bluetooth/hci_core.h>
  32. #ifndef CONFIG_BT_HCIBPA10X_DEBUG
  33. #undef BT_DBG
  34. #define BT_DBG(D...)
  35. #endif
  36. #define VERSION "0.8"
  37. static int ignore = 0;
  38. static struct usb_device_id bpa10x_table[] = {
  39. /* Tektronix BPA 100/105 (Digianswer) */
  40. { USB_DEVICE(0x08fd, 0x0002) },
  41. { } /* Terminating entry */
  42. };
  43. MODULE_DEVICE_TABLE(usb, bpa10x_table);
  44. #define BPA10X_CMD_EP 0x00
  45. #define BPA10X_EVT_EP 0x81
  46. #define BPA10X_TX_EP 0x02
  47. #define BPA10X_RX_EP 0x82
  48. #define BPA10X_CMD_BUF_SIZE 252
  49. #define BPA10X_EVT_BUF_SIZE 16
  50. #define BPA10X_TX_BUF_SIZE 384
  51. #define BPA10X_RX_BUF_SIZE 384
  52. struct bpa10x_data {
  53. struct hci_dev *hdev;
  54. struct usb_device *udev;
  55. rwlock_t lock;
  56. struct sk_buff_head cmd_queue;
  57. struct urb *cmd_urb;
  58. struct urb *evt_urb;
  59. struct sk_buff *evt_skb;
  60. unsigned int evt_len;
  61. struct sk_buff_head tx_queue;
  62. struct urb *tx_urb;
  63. struct urb *rx_urb;
  64. };
  65. #define HCI_VENDOR_HDR_SIZE 5
  66. struct hci_vendor_hdr {
  67. __u8 type;
  68. __le16 snum;
  69. __le16 dlen;
  70. } __attribute__ ((packed));
  71. static void bpa10x_recv_bulk(struct bpa10x_data *data, unsigned char *buf, int count)
  72. {
  73. struct hci_acl_hdr *ah;
  74. struct hci_sco_hdr *sh;
  75. struct hci_vendor_hdr *vh;
  76. struct sk_buff *skb;
  77. int len;
  78. while (count) {
  79. switch (*buf++) {
  80. case HCI_ACLDATA_PKT:
  81. ah = (struct hci_acl_hdr *) buf;
  82. len = HCI_ACL_HDR_SIZE + __le16_to_cpu(ah->dlen);
  83. skb = bt_skb_alloc(len, GFP_ATOMIC);
  84. if (skb) {
  85. memcpy(skb_put(skb, len), buf, len);
  86. skb->dev = (void *) data->hdev;
  87. bt_cb(skb)->pkt_type = HCI_ACLDATA_PKT;
  88. hci_recv_frame(skb);
  89. }
  90. break;
  91. case HCI_SCODATA_PKT:
  92. sh = (struct hci_sco_hdr *) buf;
  93. len = HCI_SCO_HDR_SIZE + sh->dlen;
  94. skb = bt_skb_alloc(len, GFP_ATOMIC);
  95. if (skb) {
  96. memcpy(skb_put(skb, len), buf, len);
  97. skb->dev = (void *) data->hdev;
  98. bt_cb(skb)->pkt_type = HCI_SCODATA_PKT;
  99. hci_recv_frame(skb);
  100. }
  101. break;
  102. case HCI_VENDOR_PKT:
  103. vh = (struct hci_vendor_hdr *) buf;
  104. len = HCI_VENDOR_HDR_SIZE + __le16_to_cpu(vh->dlen);
  105. skb = bt_skb_alloc(len, GFP_ATOMIC);
  106. if (skb) {
  107. memcpy(skb_put(skb, len), buf, len);
  108. skb->dev = (void *) data->hdev;
  109. bt_cb(skb)->pkt_type = HCI_VENDOR_PKT;
  110. hci_recv_frame(skb);
  111. }
  112. break;
  113. default:
  114. len = count - 1;
  115. break;
  116. }
  117. buf += len;
  118. count -= (len + 1);
  119. }
  120. }
  121. static int bpa10x_recv_event(struct bpa10x_data *data, unsigned char *buf, int size)
  122. {
  123. BT_DBG("data %p buf %p size %d", data, buf, size);
  124. if (data->evt_skb) {
  125. struct sk_buff *skb = data->evt_skb;
  126. memcpy(skb_put(skb, size), buf, size);
  127. if (skb->len == data->evt_len) {
  128. data->evt_skb = NULL;
  129. data->evt_len = 0;
  130. hci_recv_frame(skb);
  131. }
  132. } else {
  133. struct sk_buff *skb;
  134. struct hci_event_hdr *hdr;
  135. unsigned char pkt_type;
  136. int pkt_len = 0;
  137. if (size < HCI_EVENT_HDR_SIZE + 1) {
  138. BT_ERR("%s event packet block with size %d is too short",
  139. data->hdev->name, size);
  140. return -EILSEQ;
  141. }
  142. pkt_type = *buf++;
  143. size--;
  144. if (pkt_type != HCI_EVENT_PKT) {
  145. BT_ERR("%s unexpected event packet start byte 0x%02x",
  146. data->hdev->name, pkt_type);
  147. return -EPROTO;
  148. }
  149. hdr = (struct hci_event_hdr *) buf;
  150. pkt_len = HCI_EVENT_HDR_SIZE + hdr->plen;
  151. skb = bt_skb_alloc(pkt_len, GFP_ATOMIC);
  152. if (!skb) {
  153. BT_ERR("%s no memory for new event packet",
  154. data->hdev->name);
  155. return -ENOMEM;
  156. }
  157. skb->dev = (void *) data->hdev;
  158. bt_cb(skb)->pkt_type = pkt_type;
  159. memcpy(skb_put(skb, size), buf, size);
  160. if (pkt_len == size) {
  161. hci_recv_frame(skb);
  162. } else {
  163. data->evt_skb = skb;
  164. data->evt_len = pkt_len;
  165. }
  166. }
  167. return 0;
  168. }
  169. static void bpa10x_wakeup(struct bpa10x_data *data)
  170. {
  171. struct urb *urb;
  172. struct sk_buff *skb;
  173. int err;
  174. BT_DBG("data %p", data);
  175. urb = data->cmd_urb;
  176. if (urb->status == -EINPROGRESS)
  177. skb = NULL;
  178. else
  179. skb = skb_dequeue(&data->cmd_queue);
  180. if (skb) {
  181. struct usb_ctrlrequest *cr;
  182. if (skb->len > BPA10X_CMD_BUF_SIZE) {
  183. BT_ERR("%s command packet with size %d is too big",
  184. data->hdev->name, skb->len);
  185. kfree_skb(skb);
  186. return;
  187. }
  188. cr = (struct usb_ctrlrequest *) urb->setup_packet;
  189. cr->wLength = __cpu_to_le16(skb->len);
  190. memcpy(urb->transfer_buffer, skb->data, skb->len);
  191. urb->transfer_buffer_length = skb->len;
  192. err = usb_submit_urb(urb, GFP_ATOMIC);
  193. if (err < 0 && err != -ENODEV) {
  194. BT_ERR("%s submit failed for command urb %p with error %d",
  195. data->hdev->name, urb, err);
  196. skb_queue_head(&data->cmd_queue, skb);
  197. } else
  198. kfree_skb(skb);
  199. }
  200. urb = data->tx_urb;
  201. if (urb->status == -EINPROGRESS)
  202. skb = NULL;
  203. else
  204. skb = skb_dequeue(&data->tx_queue);
  205. if (skb) {
  206. memcpy(urb->transfer_buffer, skb->data, skb->len);
  207. urb->transfer_buffer_length = skb->len;
  208. err = usb_submit_urb(urb, GFP_ATOMIC);
  209. if (err < 0 && err != -ENODEV) {
  210. BT_ERR("%s submit failed for command urb %p with error %d",
  211. data->hdev->name, urb, err);
  212. skb_queue_head(&data->tx_queue, skb);
  213. } else
  214. kfree_skb(skb);
  215. }
  216. }
  217. static void bpa10x_complete(struct urb *urb)
  218. {
  219. struct bpa10x_data *data = urb->context;
  220. unsigned char *buf = urb->transfer_buffer;
  221. int err, count = urb->actual_length;
  222. BT_DBG("data %p urb %p buf %p count %d", data, urb, buf, count);
  223. read_lock(&data->lock);
  224. if (!test_bit(HCI_RUNNING, &data->hdev->flags))
  225. goto unlock;
  226. if (urb->status < 0 || !count)
  227. goto resubmit;
  228. if (usb_pipein(urb->pipe)) {
  229. data->hdev->stat.byte_rx += count;
  230. if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT)
  231. bpa10x_recv_event(data, buf, count);
  232. if (usb_pipetype(urb->pipe) == PIPE_BULK)
  233. bpa10x_recv_bulk(data, buf, count);
  234. } else {
  235. data->hdev->stat.byte_tx += count;
  236. bpa10x_wakeup(data);
  237. }
  238. resubmit:
  239. if (usb_pipein(urb->pipe)) {
  240. err = usb_submit_urb(urb, GFP_ATOMIC);
  241. if (err < 0 && err != -ENODEV) {
  242. BT_ERR("%s urb %p type %d resubmit status %d",
  243. data->hdev->name, urb, usb_pipetype(urb->pipe), err);
  244. }
  245. }
  246. unlock:
  247. read_unlock(&data->lock);
  248. }
  249. static inline struct urb *bpa10x_alloc_urb(struct usb_device *udev, unsigned int pipe,
  250. size_t size, gfp_t flags, void *data)
  251. {
  252. struct urb *urb;
  253. struct usb_ctrlrequest *cr;
  254. unsigned char *buf;
  255. BT_DBG("udev %p data %p", udev, data);
  256. urb = usb_alloc_urb(0, flags);
  257. if (!urb)
  258. return NULL;
  259. buf = kmalloc(size, flags);
  260. if (!buf) {
  261. usb_free_urb(urb);
  262. return NULL;
  263. }
  264. switch (usb_pipetype(pipe)) {
  265. case PIPE_CONTROL:
  266. cr = kmalloc(sizeof(*cr), flags);
  267. if (!cr) {
  268. kfree(buf);
  269. usb_free_urb(urb);
  270. return NULL;
  271. }
  272. cr->bRequestType = USB_TYPE_VENDOR;
  273. cr->bRequest = 0;
  274. cr->wIndex = 0;
  275. cr->wValue = 0;
  276. cr->wLength = __cpu_to_le16(0);
  277. usb_fill_control_urb(urb, udev, pipe, (void *) cr, buf, 0, bpa10x_complete, data);
  278. break;
  279. case PIPE_INTERRUPT:
  280. usb_fill_int_urb(urb, udev, pipe, buf, size, bpa10x_complete, data, 1);
  281. break;
  282. case PIPE_BULK:
  283. usb_fill_bulk_urb(urb, udev, pipe, buf, size, bpa10x_complete, data);
  284. break;
  285. default:
  286. kfree(buf);
  287. usb_free_urb(urb);
  288. return NULL;
  289. }
  290. return urb;
  291. }
  292. static inline void bpa10x_free_urb(struct urb *urb)
  293. {
  294. BT_DBG("urb %p", urb);
  295. if (!urb)
  296. return;
  297. kfree(urb->setup_packet);
  298. kfree(urb->transfer_buffer);
  299. usb_free_urb(urb);
  300. }
  301. static int bpa10x_open(struct hci_dev *hdev)
  302. {
  303. struct bpa10x_data *data = hdev->driver_data;
  304. struct usb_device *udev = data->udev;
  305. unsigned long flags;
  306. int err;
  307. BT_DBG("hdev %p data %p", hdev, data);
  308. if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
  309. return 0;
  310. data->cmd_urb = bpa10x_alloc_urb(udev, usb_sndctrlpipe(udev, BPA10X_CMD_EP),
  311. BPA10X_CMD_BUF_SIZE, GFP_KERNEL, data);
  312. if (!data->cmd_urb) {
  313. err = -ENOMEM;
  314. goto done;
  315. }
  316. data->evt_urb = bpa10x_alloc_urb(udev, usb_rcvintpipe(udev, BPA10X_EVT_EP),
  317. BPA10X_EVT_BUF_SIZE, GFP_KERNEL, data);
  318. if (!data->evt_urb) {
  319. bpa10x_free_urb(data->cmd_urb);
  320. err = -ENOMEM;
  321. goto done;
  322. }
  323. data->rx_urb = bpa10x_alloc_urb(udev, usb_rcvbulkpipe(udev, BPA10X_RX_EP),
  324. BPA10X_RX_BUF_SIZE, GFP_KERNEL, data);
  325. if (!data->rx_urb) {
  326. bpa10x_free_urb(data->evt_urb);
  327. bpa10x_free_urb(data->cmd_urb);
  328. err = -ENOMEM;
  329. goto done;
  330. }
  331. data->tx_urb = bpa10x_alloc_urb(udev, usb_sndbulkpipe(udev, BPA10X_TX_EP),
  332. BPA10X_TX_BUF_SIZE, GFP_KERNEL, data);
  333. if (!data->rx_urb) {
  334. bpa10x_free_urb(data->rx_urb);
  335. bpa10x_free_urb(data->evt_urb);
  336. bpa10x_free_urb(data->cmd_urb);
  337. err = -ENOMEM;
  338. goto done;
  339. }
  340. write_lock_irqsave(&data->lock, flags);
  341. err = usb_submit_urb(data->evt_urb, GFP_ATOMIC);
  342. if (err < 0) {
  343. BT_ERR("%s submit failed for event urb %p with error %d",
  344. data->hdev->name, data->evt_urb, err);
  345. } else {
  346. err = usb_submit_urb(data->rx_urb, GFP_ATOMIC);
  347. if (err < 0) {
  348. BT_ERR("%s submit failed for rx urb %p with error %d",
  349. data->hdev->name, data->evt_urb, err);
  350. usb_kill_urb(data->evt_urb);
  351. }
  352. }
  353. write_unlock_irqrestore(&data->lock, flags);
  354. done:
  355. if (err < 0)
  356. clear_bit(HCI_RUNNING, &hdev->flags);
  357. return err;
  358. }
  359. static int bpa10x_close(struct hci_dev *hdev)
  360. {
  361. struct bpa10x_data *data = hdev->driver_data;
  362. unsigned long flags;
  363. BT_DBG("hdev %p data %p", hdev, data);
  364. if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
  365. return 0;
  366. write_lock_irqsave(&data->lock, flags);
  367. skb_queue_purge(&data->cmd_queue);
  368. usb_kill_urb(data->cmd_urb);
  369. usb_kill_urb(data->evt_urb);
  370. usb_kill_urb(data->rx_urb);
  371. usb_kill_urb(data->tx_urb);
  372. write_unlock_irqrestore(&data->lock, flags);
  373. bpa10x_free_urb(data->cmd_urb);
  374. bpa10x_free_urb(data->evt_urb);
  375. bpa10x_free_urb(data->rx_urb);
  376. bpa10x_free_urb(data->tx_urb);
  377. return 0;
  378. }
  379. static int bpa10x_flush(struct hci_dev *hdev)
  380. {
  381. struct bpa10x_data *data = hdev->driver_data;
  382. BT_DBG("hdev %p data %p", hdev, data);
  383. skb_queue_purge(&data->cmd_queue);
  384. return 0;
  385. }
  386. static int bpa10x_send_frame(struct sk_buff *skb)
  387. {
  388. struct hci_dev *hdev = (struct hci_dev *) skb->dev;
  389. struct bpa10x_data *data;
  390. BT_DBG("hdev %p skb %p type %d len %d", hdev, skb, bt_cb(skb)->pkt_type, skb->len);
  391. if (!hdev) {
  392. BT_ERR("Frame for unknown HCI device");
  393. return -ENODEV;
  394. }
  395. if (!test_bit(HCI_RUNNING, &hdev->flags))
  396. return -EBUSY;
  397. data = hdev->driver_data;
  398. /* Prepend skb with frame type */
  399. memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
  400. switch (bt_cb(skb)->pkt_type) {
  401. case HCI_COMMAND_PKT:
  402. hdev->stat.cmd_tx++;
  403. skb_queue_tail(&data->cmd_queue, skb);
  404. break;
  405. case HCI_ACLDATA_PKT:
  406. hdev->stat.acl_tx++;
  407. skb_queue_tail(&data->tx_queue, skb);
  408. break;
  409. case HCI_SCODATA_PKT:
  410. hdev->stat.sco_tx++;
  411. skb_queue_tail(&data->tx_queue, skb);
  412. break;
  413. };
  414. read_lock(&data->lock);
  415. bpa10x_wakeup(data);
  416. read_unlock(&data->lock);
  417. return 0;
  418. }
  419. static void bpa10x_destruct(struct hci_dev *hdev)
  420. {
  421. struct bpa10x_data *data = hdev->driver_data;
  422. BT_DBG("hdev %p data %p", hdev, data);
  423. kfree(data);
  424. }
  425. static int bpa10x_probe(struct usb_interface *intf, const struct usb_device_id *id)
  426. {
  427. struct usb_device *udev = interface_to_usbdev(intf);
  428. struct hci_dev *hdev;
  429. struct bpa10x_data *data;
  430. int err;
  431. BT_DBG("intf %p id %p", intf, id);
  432. if (ignore)
  433. return -ENODEV;
  434. if (intf->cur_altsetting->desc.bInterfaceNumber > 0)
  435. return -ENODEV;
  436. data = kzalloc(sizeof(*data), GFP_KERNEL);
  437. if (!data) {
  438. BT_ERR("Can't allocate data structure");
  439. return -ENOMEM;
  440. }
  441. data->udev = udev;
  442. rwlock_init(&data->lock);
  443. skb_queue_head_init(&data->cmd_queue);
  444. skb_queue_head_init(&data->tx_queue);
  445. hdev = hci_alloc_dev();
  446. if (!hdev) {
  447. BT_ERR("Can't allocate HCI device");
  448. kfree(data);
  449. return -ENOMEM;
  450. }
  451. data->hdev = hdev;
  452. hdev->type = HCI_USB;
  453. hdev->driver_data = data;
  454. SET_HCIDEV_DEV(hdev, &intf->dev);
  455. hdev->open = bpa10x_open;
  456. hdev->close = bpa10x_close;
  457. hdev->flush = bpa10x_flush;
  458. hdev->send = bpa10x_send_frame;
  459. hdev->destruct = bpa10x_destruct;
  460. hdev->owner = THIS_MODULE;
  461. err = hci_register_dev(hdev);
  462. if (err < 0) {
  463. BT_ERR("Can't register HCI device");
  464. kfree(data);
  465. hci_free_dev(hdev);
  466. return err;
  467. }
  468. usb_set_intfdata(intf, data);
  469. return 0;
  470. }
  471. static void bpa10x_disconnect(struct usb_interface *intf)
  472. {
  473. struct bpa10x_data *data = usb_get_intfdata(intf);
  474. struct hci_dev *hdev = data->hdev;
  475. BT_DBG("intf %p", intf);
  476. if (!hdev)
  477. return;
  478. usb_set_intfdata(intf, NULL);
  479. if (hci_unregister_dev(hdev) < 0)
  480. BT_ERR("Can't unregister HCI device %s", hdev->name);
  481. hci_free_dev(hdev);
  482. }
  483. static struct usb_driver bpa10x_driver = {
  484. .name = "bpa10x",
  485. .probe = bpa10x_probe,
  486. .disconnect = bpa10x_disconnect,
  487. .id_table = bpa10x_table,
  488. };
  489. static int __init bpa10x_init(void)
  490. {
  491. int err;
  492. BT_INFO("Digianswer Bluetooth USB driver ver %s", VERSION);
  493. err = usb_register(&bpa10x_driver);
  494. if (err < 0)
  495. BT_ERR("Failed to register USB driver");
  496. return err;
  497. }
  498. static void __exit bpa10x_exit(void)
  499. {
  500. usb_deregister(&bpa10x_driver);
  501. }
  502. module_init(bpa10x_init);
  503. module_exit(bpa10x_exit);
  504. module_param(ignore, bool, 0644);
  505. MODULE_PARM_DESC(ignore, "Ignore devices from the matching table");
  506. MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
  507. MODULE_DESCRIPTION("Digianswer Bluetooth USB driver ver " VERSION);
  508. MODULE_VERSION(VERSION);
  509. MODULE_LICENSE("GPL");