bfusb.c 15 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. *
  4. * AVM BlueFRITZ! USB driver
  5. *
  6. * Copyright (C) 2003-2006 Marcel Holtmann <marcel@holtmann.org>
  7. */
  8. #include <linux/module.h>
  9. #include <linux/kernel.h>
  10. #include <linux/init.h>
  11. #include <linux/slab.h>
  12. #include <linux/types.h>
  13. #include <linux/errno.h>
  14. #include <linux/skbuff.h>
  15. #include <linux/device.h>
  16. #include <linux/firmware.h>
  17. #include <linux/usb.h>
  18. #include <net/bluetooth/bluetooth.h>
  19. #include <net/bluetooth/hci_core.h>
  20. #define VERSION "1.2"
  21. static struct usb_driver bfusb_driver;
  22. static const struct usb_device_id bfusb_table[] = {
  23. /* AVM BlueFRITZ! USB */
  24. { USB_DEVICE(0x057c, 0x2200) },
  25. { } /* Terminating entry */
  26. };
  27. MODULE_DEVICE_TABLE(usb, bfusb_table);
  28. #define BFUSB_MAX_BLOCK_SIZE 256
  29. #define BFUSB_BLOCK_TIMEOUT 3000
  30. #define BFUSB_TX_PROCESS 1
  31. #define BFUSB_TX_WAKEUP 2
  32. #define BFUSB_MAX_BULK_TX 2
  33. #define BFUSB_MAX_BULK_RX 2
  34. struct bfusb_data {
  35. struct hci_dev *hdev;
  36. unsigned long state;
  37. struct usb_device *udev;
  38. unsigned int bulk_in_ep;
  39. unsigned int bulk_out_ep;
  40. unsigned int bulk_pkt_size;
  41. rwlock_t lock;
  42. struct sk_buff_head transmit_q;
  43. struct sk_buff *reassembly;
  44. atomic_t pending_tx;
  45. struct sk_buff_head pending_q;
  46. struct sk_buff_head completed_q;
  47. };
  48. struct bfusb_data_scb {
  49. struct urb *urb;
  50. };
  51. static void bfusb_tx_complete(struct urb *urb);
  52. static void bfusb_rx_complete(struct urb *urb);
  53. static struct urb *bfusb_get_completed(struct bfusb_data *data)
  54. {
  55. struct sk_buff *skb;
  56. struct urb *urb = NULL;
  57. BT_DBG("bfusb %p", data);
  58. skb = skb_dequeue(&data->completed_q);
  59. if (skb) {
  60. urb = ((struct bfusb_data_scb *) skb->cb)->urb;
  61. kfree_skb(skb);
  62. }
  63. return urb;
  64. }
  65. static void bfusb_unlink_urbs(struct bfusb_data *data)
  66. {
  67. struct sk_buff *skb;
  68. struct urb *urb;
  69. BT_DBG("bfusb %p", data);
  70. while ((skb = skb_dequeue(&data->pending_q))) {
  71. urb = ((struct bfusb_data_scb *) skb->cb)->urb;
  72. usb_kill_urb(urb);
  73. skb_queue_tail(&data->completed_q, skb);
  74. }
  75. while ((urb = bfusb_get_completed(data)))
  76. usb_free_urb(urb);
  77. }
  78. static int bfusb_send_bulk(struct bfusb_data *data, struct sk_buff *skb)
  79. {
  80. struct bfusb_data_scb *scb = (void *) skb->cb;
  81. struct urb *urb = bfusb_get_completed(data);
  82. int err, pipe;
  83. BT_DBG("bfusb %p skb %p len %d", data, skb, skb->len);
  84. if (!urb) {
  85. urb = usb_alloc_urb(0, GFP_ATOMIC);
  86. if (!urb)
  87. return -ENOMEM;
  88. }
  89. pipe = usb_sndbulkpipe(data->udev, data->bulk_out_ep);
  90. usb_fill_bulk_urb(urb, data->udev, pipe, skb->data, skb->len,
  91. bfusb_tx_complete, skb);
  92. scb->urb = urb;
  93. skb_queue_tail(&data->pending_q, skb);
  94. err = usb_submit_urb(urb, GFP_ATOMIC);
  95. if (err) {
  96. bt_dev_err(data->hdev, "bulk tx submit failed urb %p err %d",
  97. urb, err);
  98. skb_unlink(skb, &data->pending_q);
  99. usb_free_urb(urb);
  100. } else
  101. atomic_inc(&data->pending_tx);
  102. return err;
  103. }
  104. static void bfusb_tx_wakeup(struct bfusb_data *data)
  105. {
  106. struct sk_buff *skb;
  107. BT_DBG("bfusb %p", data);
  108. if (test_and_set_bit(BFUSB_TX_PROCESS, &data->state)) {
  109. set_bit(BFUSB_TX_WAKEUP, &data->state);
  110. return;
  111. }
  112. do {
  113. clear_bit(BFUSB_TX_WAKEUP, &data->state);
  114. while ((atomic_read(&data->pending_tx) < BFUSB_MAX_BULK_TX) &&
  115. (skb = skb_dequeue(&data->transmit_q))) {
  116. if (bfusb_send_bulk(data, skb) < 0) {
  117. skb_queue_head(&data->transmit_q, skb);
  118. break;
  119. }
  120. }
  121. } while (test_bit(BFUSB_TX_WAKEUP, &data->state));
  122. clear_bit(BFUSB_TX_PROCESS, &data->state);
  123. }
  124. static void bfusb_tx_complete(struct urb *urb)
  125. {
  126. struct sk_buff *skb = (struct sk_buff *) urb->context;
  127. struct bfusb_data *data = (struct bfusb_data *) skb->dev;
  128. BT_DBG("bfusb %p urb %p skb %p len %d", data, urb, skb, skb->len);
  129. atomic_dec(&data->pending_tx);
  130. if (!test_bit(HCI_RUNNING, &data->hdev->flags))
  131. return;
  132. if (!urb->status)
  133. data->hdev->stat.byte_tx += skb->len;
  134. else
  135. data->hdev->stat.err_tx++;
  136. read_lock(&data->lock);
  137. skb_unlink(skb, &data->pending_q);
  138. skb_queue_tail(&data->completed_q, skb);
  139. bfusb_tx_wakeup(data);
  140. read_unlock(&data->lock);
  141. }
  142. static int bfusb_rx_submit(struct bfusb_data *data, struct urb *urb)
  143. {
  144. struct bfusb_data_scb *scb;
  145. struct sk_buff *skb;
  146. int err, pipe, size = HCI_MAX_FRAME_SIZE + 32;
  147. BT_DBG("bfusb %p urb %p", data, urb);
  148. if (!urb) {
  149. urb = usb_alloc_urb(0, GFP_ATOMIC);
  150. if (!urb)
  151. return -ENOMEM;
  152. }
  153. skb = bt_skb_alloc(size, GFP_ATOMIC);
  154. if (!skb) {
  155. usb_free_urb(urb);
  156. return -ENOMEM;
  157. }
  158. skb->dev = (void *) data;
  159. scb = (struct bfusb_data_scb *) skb->cb;
  160. scb->urb = urb;
  161. pipe = usb_rcvbulkpipe(data->udev, data->bulk_in_ep);
  162. usb_fill_bulk_urb(urb, data->udev, pipe, skb->data, size,
  163. bfusb_rx_complete, skb);
  164. skb_queue_tail(&data->pending_q, skb);
  165. err = usb_submit_urb(urb, GFP_ATOMIC);
  166. if (err) {
  167. bt_dev_err(data->hdev, "bulk rx submit failed urb %p err %d",
  168. urb, err);
  169. skb_unlink(skb, &data->pending_q);
  170. kfree_skb(skb);
  171. usb_free_urb(urb);
  172. }
  173. return err;
  174. }
  175. static inline int bfusb_recv_block(struct bfusb_data *data, int hdr, unsigned char *buf, int len)
  176. {
  177. BT_DBG("bfusb %p hdr 0x%02x data %p len %d", data, hdr, buf, len);
  178. if (hdr & 0x10) {
  179. bt_dev_err(data->hdev, "error in block");
  180. kfree_skb(data->reassembly);
  181. data->reassembly = NULL;
  182. return -EIO;
  183. }
  184. if (hdr & 0x04) {
  185. struct sk_buff *skb;
  186. unsigned char pkt_type;
  187. int pkt_len = 0;
  188. if (data->reassembly) {
  189. bt_dev_err(data->hdev, "unexpected start block");
  190. kfree_skb(data->reassembly);
  191. data->reassembly = NULL;
  192. }
  193. if (len < 1) {
  194. bt_dev_err(data->hdev, "no packet type found");
  195. return -EPROTO;
  196. }
  197. pkt_type = *buf++; len--;
  198. switch (pkt_type) {
  199. case HCI_EVENT_PKT:
  200. if (len >= HCI_EVENT_HDR_SIZE) {
  201. struct hci_event_hdr *hdr = (struct hci_event_hdr *) buf;
  202. pkt_len = HCI_EVENT_HDR_SIZE + hdr->plen;
  203. } else {
  204. bt_dev_err(data->hdev, "event block is too short");
  205. return -EILSEQ;
  206. }
  207. break;
  208. case HCI_ACLDATA_PKT:
  209. if (len >= HCI_ACL_HDR_SIZE) {
  210. struct hci_acl_hdr *hdr = (struct hci_acl_hdr *) buf;
  211. pkt_len = HCI_ACL_HDR_SIZE + __le16_to_cpu(hdr->dlen);
  212. } else {
  213. bt_dev_err(data->hdev, "data block is too short");
  214. return -EILSEQ;
  215. }
  216. break;
  217. case HCI_SCODATA_PKT:
  218. if (len >= HCI_SCO_HDR_SIZE) {
  219. struct hci_sco_hdr *hdr = (struct hci_sco_hdr *) buf;
  220. pkt_len = HCI_SCO_HDR_SIZE + hdr->dlen;
  221. } else {
  222. bt_dev_err(data->hdev, "audio block is too short");
  223. return -EILSEQ;
  224. }
  225. break;
  226. }
  227. skb = bt_skb_alloc(pkt_len, GFP_ATOMIC);
  228. if (!skb) {
  229. bt_dev_err(data->hdev, "no memory for the packet");
  230. return -ENOMEM;
  231. }
  232. hci_skb_pkt_type(skb) = pkt_type;
  233. data->reassembly = skb;
  234. } else {
  235. if (!data->reassembly) {
  236. bt_dev_err(data->hdev, "unexpected continuation block");
  237. return -EIO;
  238. }
  239. }
  240. if (len > 0)
  241. skb_put_data(data->reassembly, buf, len);
  242. if (hdr & 0x08) {
  243. hci_recv_frame(data->hdev, data->reassembly);
  244. data->reassembly = NULL;
  245. }
  246. return 0;
  247. }
  248. static void bfusb_rx_complete(struct urb *urb)
  249. {
  250. struct sk_buff *skb = (struct sk_buff *) urb->context;
  251. struct bfusb_data *data = (struct bfusb_data *) skb->dev;
  252. unsigned char *buf = urb->transfer_buffer;
  253. int count = urb->actual_length;
  254. int err, hdr, len;
  255. BT_DBG("bfusb %p urb %p skb %p len %d", data, urb, skb, skb->len);
  256. read_lock(&data->lock);
  257. if (!test_bit(HCI_RUNNING, &data->hdev->flags))
  258. goto unlock;
  259. if (urb->status || !count)
  260. goto resubmit;
  261. data->hdev->stat.byte_rx += count;
  262. skb_put(skb, count);
  263. while (count) {
  264. hdr = buf[0] | (buf[1] << 8);
  265. if (hdr & 0x4000) {
  266. len = 0;
  267. count -= 2;
  268. buf += 2;
  269. } else {
  270. len = (buf[2] == 0) ? 256 : buf[2];
  271. count -= 3;
  272. buf += 3;
  273. }
  274. if (count < len) {
  275. bt_dev_err(data->hdev, "block extends over URB buffer ranges");
  276. }
  277. if ((hdr & 0xe1) == 0xc1)
  278. bfusb_recv_block(data, hdr, buf, len);
  279. count -= len;
  280. buf += len;
  281. }
  282. skb_unlink(skb, &data->pending_q);
  283. kfree_skb(skb);
  284. bfusb_rx_submit(data, urb);
  285. read_unlock(&data->lock);
  286. return;
  287. resubmit:
  288. urb->dev = data->udev;
  289. err = usb_submit_urb(urb, GFP_ATOMIC);
  290. if (err) {
  291. bt_dev_err(data->hdev, "bulk resubmit failed urb %p err %d",
  292. urb, err);
  293. }
  294. unlock:
  295. read_unlock(&data->lock);
  296. }
  297. static int bfusb_open(struct hci_dev *hdev)
  298. {
  299. struct bfusb_data *data = hci_get_drvdata(hdev);
  300. unsigned long flags;
  301. int i, err;
  302. BT_DBG("hdev %p bfusb %p", hdev, data);
  303. write_lock_irqsave(&data->lock, flags);
  304. err = bfusb_rx_submit(data, NULL);
  305. if (!err) {
  306. for (i = 1; i < BFUSB_MAX_BULK_RX; i++)
  307. bfusb_rx_submit(data, NULL);
  308. }
  309. write_unlock_irqrestore(&data->lock, flags);
  310. return err;
  311. }
  312. static int bfusb_flush(struct hci_dev *hdev)
  313. {
  314. struct bfusb_data *data = hci_get_drvdata(hdev);
  315. BT_DBG("hdev %p bfusb %p", hdev, data);
  316. skb_queue_purge(&data->transmit_q);
  317. return 0;
  318. }
  319. static int bfusb_close(struct hci_dev *hdev)
  320. {
  321. struct bfusb_data *data = hci_get_drvdata(hdev);
  322. unsigned long flags;
  323. BT_DBG("hdev %p bfusb %p", hdev, data);
  324. write_lock_irqsave(&data->lock, flags);
  325. write_unlock_irqrestore(&data->lock, flags);
  326. bfusb_unlink_urbs(data);
  327. bfusb_flush(hdev);
  328. return 0;
  329. }
  330. static int bfusb_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
  331. {
  332. struct bfusb_data *data = hci_get_drvdata(hdev);
  333. struct sk_buff *nskb;
  334. unsigned char buf[3];
  335. int sent = 0, size, count;
  336. BT_DBG("hdev %p skb %p type %d len %d", hdev, skb,
  337. hci_skb_pkt_type(skb), skb->len);
  338. switch (hci_skb_pkt_type(skb)) {
  339. case HCI_COMMAND_PKT:
  340. hdev->stat.cmd_tx++;
  341. break;
  342. case HCI_ACLDATA_PKT:
  343. hdev->stat.acl_tx++;
  344. break;
  345. case HCI_SCODATA_PKT:
  346. hdev->stat.sco_tx++;
  347. break;
  348. }
  349. /* Prepend skb with frame type */
  350. memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
  351. count = skb->len;
  352. /* Max HCI frame size seems to be 1511 + 1 */
  353. nskb = bt_skb_alloc(count + 32, GFP_KERNEL);
  354. if (!nskb) {
  355. bt_dev_err(hdev, "Can't allocate memory for new packet");
  356. return -ENOMEM;
  357. }
  358. nskb->dev = (void *) data;
  359. while (count) {
  360. size = min_t(uint, count, BFUSB_MAX_BLOCK_SIZE);
  361. buf[0] = 0xc1 | ((sent == 0) ? 0x04 : 0) | ((count == size) ? 0x08 : 0);
  362. buf[1] = 0x00;
  363. buf[2] = (size == BFUSB_MAX_BLOCK_SIZE) ? 0 : size;
  364. skb_put_data(nskb, buf, 3);
  365. skb_copy_from_linear_data_offset(skb, sent, skb_put(nskb, size), size);
  366. sent += size;
  367. count -= size;
  368. }
  369. /* Don't send frame with multiple size of bulk max packet */
  370. if ((nskb->len % data->bulk_pkt_size) == 0) {
  371. buf[0] = 0xdd;
  372. buf[1] = 0x00;
  373. skb_put_data(nskb, buf, 2);
  374. }
  375. read_lock(&data->lock);
  376. skb_queue_tail(&data->transmit_q, nskb);
  377. bfusb_tx_wakeup(data);
  378. read_unlock(&data->lock);
  379. kfree_skb(skb);
  380. return 0;
  381. }
  382. static int bfusb_load_firmware(struct bfusb_data *data,
  383. const unsigned char *firmware, int count)
  384. {
  385. unsigned char *buf;
  386. int err, pipe, len, size, sent = 0;
  387. BT_DBG("bfusb %p udev %p", data, data->udev);
  388. BT_INFO("BlueFRITZ! USB loading firmware");
  389. buf = kmalloc(BFUSB_MAX_BLOCK_SIZE + 3, GFP_KERNEL);
  390. if (!buf) {
  391. BT_ERR("Can't allocate memory chunk for firmware");
  392. return -ENOMEM;
  393. }
  394. pipe = usb_sndctrlpipe(data->udev, 0);
  395. if (usb_control_msg(data->udev, pipe, USB_REQ_SET_CONFIGURATION,
  396. 0, 1, 0, NULL, 0, USB_CTRL_SET_TIMEOUT) < 0) {
  397. BT_ERR("Can't change to loading configuration");
  398. kfree(buf);
  399. return -EBUSY;
  400. }
  401. data->udev->toggle[0] = data->udev->toggle[1] = 0;
  402. pipe = usb_sndbulkpipe(data->udev, data->bulk_out_ep);
  403. while (count) {
  404. size = min_t(uint, count, BFUSB_MAX_BLOCK_SIZE + 3);
  405. memcpy(buf, firmware + sent, size);
  406. err = usb_bulk_msg(data->udev, pipe, buf, size,
  407. &len, BFUSB_BLOCK_TIMEOUT);
  408. if (err || (len != size)) {
  409. BT_ERR("Error in firmware loading");
  410. goto error;
  411. }
  412. sent += size;
  413. count -= size;
  414. }
  415. err = usb_bulk_msg(data->udev, pipe, NULL, 0,
  416. &len, BFUSB_BLOCK_TIMEOUT);
  417. if (err < 0) {
  418. BT_ERR("Error in null packet request");
  419. goto error;
  420. }
  421. pipe = usb_sndctrlpipe(data->udev, 0);
  422. err = usb_control_msg(data->udev, pipe, USB_REQ_SET_CONFIGURATION,
  423. 0, 2, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
  424. if (err < 0) {
  425. BT_ERR("Can't change to running configuration");
  426. goto error;
  427. }
  428. data->udev->toggle[0] = data->udev->toggle[1] = 0;
  429. BT_INFO("BlueFRITZ! USB device ready");
  430. kfree(buf);
  431. return 0;
  432. error:
  433. kfree(buf);
  434. pipe = usb_sndctrlpipe(data->udev, 0);
  435. usb_control_msg(data->udev, pipe, USB_REQ_SET_CONFIGURATION,
  436. 0, 0, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
  437. return err;
  438. }
  439. static int bfusb_probe(struct usb_interface *intf, const struct usb_device_id *id)
  440. {
  441. const struct firmware *firmware;
  442. struct usb_device *udev = interface_to_usbdev(intf);
  443. struct usb_host_endpoint *bulk_out_ep;
  444. struct usb_host_endpoint *bulk_in_ep;
  445. struct hci_dev *hdev;
  446. struct bfusb_data *data;
  447. BT_DBG("intf %p id %p", intf, id);
  448. /* Check number of endpoints */
  449. if (intf->cur_altsetting->desc.bNumEndpoints < 2)
  450. return -EIO;
  451. bulk_out_ep = &intf->cur_altsetting->endpoint[0];
  452. bulk_in_ep = &intf->cur_altsetting->endpoint[1];
  453. if (!bulk_out_ep || !bulk_in_ep) {
  454. BT_ERR("Bulk endpoints not found");
  455. goto done;
  456. }
  457. /* Initialize control structure and load firmware */
  458. data = devm_kzalloc(&intf->dev, sizeof(struct bfusb_data), GFP_KERNEL);
  459. if (!data)
  460. return -ENOMEM;
  461. data->udev = udev;
  462. data->bulk_in_ep = bulk_in_ep->desc.bEndpointAddress;
  463. data->bulk_out_ep = bulk_out_ep->desc.bEndpointAddress;
  464. data->bulk_pkt_size = le16_to_cpu(bulk_out_ep->desc.wMaxPacketSize);
  465. if (!data->bulk_pkt_size)
  466. goto done;
  467. rwlock_init(&data->lock);
  468. data->reassembly = NULL;
  469. skb_queue_head_init(&data->transmit_q);
  470. skb_queue_head_init(&data->pending_q);
  471. skb_queue_head_init(&data->completed_q);
  472. if (request_firmware(&firmware, "bfubase.frm", &udev->dev) < 0) {
  473. BT_ERR("Firmware request failed");
  474. goto done;
  475. }
  476. BT_DBG("firmware data %p size %zu", firmware->data, firmware->size);
  477. if (bfusb_load_firmware(data, firmware->data, firmware->size) < 0) {
  478. BT_ERR("Firmware loading failed");
  479. goto release;
  480. }
  481. release_firmware(firmware);
  482. /* Initialize and register HCI device */
  483. hdev = hci_alloc_dev();
  484. if (!hdev) {
  485. BT_ERR("Can't allocate HCI device");
  486. goto done;
  487. }
  488. data->hdev = hdev;
  489. hdev->bus = HCI_USB;
  490. hci_set_drvdata(hdev, data);
  491. SET_HCIDEV_DEV(hdev, &intf->dev);
  492. hdev->open = bfusb_open;
  493. hdev->close = bfusb_close;
  494. hdev->flush = bfusb_flush;
  495. hdev->send = bfusb_send_frame;
  496. set_bit(HCI_QUIRK_BROKEN_LOCAL_COMMANDS, &hdev->quirks);
  497. if (hci_register_dev(hdev) < 0) {
  498. BT_ERR("Can't register HCI device");
  499. hci_free_dev(hdev);
  500. goto done;
  501. }
  502. usb_set_intfdata(intf, data);
  503. return 0;
  504. release:
  505. release_firmware(firmware);
  506. done:
  507. return -EIO;
  508. }
  509. static void bfusb_disconnect(struct usb_interface *intf)
  510. {
  511. struct bfusb_data *data = usb_get_intfdata(intf);
  512. struct hci_dev *hdev = data->hdev;
  513. BT_DBG("intf %p", intf);
  514. if (!hdev)
  515. return;
  516. usb_set_intfdata(intf, NULL);
  517. bfusb_close(hdev);
  518. hci_unregister_dev(hdev);
  519. hci_free_dev(hdev);
  520. }
  521. static struct usb_driver bfusb_driver = {
  522. .name = "bfusb",
  523. .probe = bfusb_probe,
  524. .disconnect = bfusb_disconnect,
  525. .id_table = bfusb_table,
  526. .disable_hub_initiated_lpm = 1,
  527. };
  528. module_usb_driver(bfusb_driver);
  529. MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
  530. MODULE_DESCRIPTION("BlueFRITZ! USB driver ver " VERSION);
  531. MODULE_VERSION(VERSION);
  532. MODULE_LICENSE("GPL");
  533. MODULE_FIRMWARE("bfubase.frm");