uss720.c 22 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*****************************************************************************/
  3. /*
  4. * uss720.c -- USS720 USB Parport Cable.
  5. *
  6. * Copyright (C) 1999, 2005, 2010
  7. * Thomas Sailer (t.sailer@alumni.ethz.ch)
  8. *
  9. * Based on parport_pc.c
  10. *
  11. * History:
  12. * 0.1 04.08.1999 Created
  13. * 0.2 07.08.1999 Some fixes mainly suggested by Tim Waugh
  14. * Interrupt handling currently disabled because
  15. * usb_request_irq crashes somewhere within ohci.c
  16. * for no apparent reason (that is for me, anyway)
  17. * ECP currently untested
  18. * 0.3 10.08.1999 fixing merge errors
  19. * 0.4 13.08.1999 Added Vendor/Product ID of Brad Hard's cable
  20. * 0.5 20.09.1999 usb_control_msg wrapper used
  21. * Nov01.2000 usb_device_table support by Adam J. Richter
  22. * 08.04.2001 Identify version on module load. gb
  23. * 0.6 02.09.2005 Fix "scheduling in interrupt" problem by making save/restore
  24. * context asynchronous
  25. *
  26. */
  27. /*****************************************************************************/
  28. #include <linux/module.h>
  29. #include <linux/socket.h>
  30. #include <linux/parport.h>
  31. #include <linux/init.h>
  32. #include <linux/usb.h>
  33. #include <linux/delay.h>
  34. #include <linux/completion.h>
  35. #include <linux/kref.h>
  36. #include <linux/slab.h>
  37. #include <linux/sched/signal.h>
  38. #define DRIVER_AUTHOR "Thomas M. Sailer, t.sailer@alumni.ethz.ch"
  39. #define DRIVER_DESC "USB Parport Cable driver for Cables using the Lucent Technologies USS720 Chip"
  40. /* --------------------------------------------------------------------- */
  41. struct parport_uss720_private {
  42. struct usb_device *usbdev;
  43. struct parport *pp;
  44. struct kref ref_count;
  45. __u8 reg[7]; /* USB registers */
  46. struct list_head asynclist;
  47. spinlock_t asynclock;
  48. };
  49. struct uss720_async_request {
  50. struct parport_uss720_private *priv;
  51. struct kref ref_count;
  52. struct list_head asynclist;
  53. struct completion compl;
  54. struct urb *urb;
  55. struct usb_ctrlrequest *dr;
  56. __u8 reg[7];
  57. };
  58. /* --------------------------------------------------------------------- */
  59. static void destroy_priv(struct kref *kref)
  60. {
  61. struct parport_uss720_private *priv = container_of(kref, struct parport_uss720_private, ref_count);
  62. dev_dbg(&priv->usbdev->dev, "destroying priv datastructure\n");
  63. usb_put_dev(priv->usbdev);
  64. kfree(priv);
  65. }
  66. static void destroy_async(struct kref *kref)
  67. {
  68. struct uss720_async_request *rq = container_of(kref, struct uss720_async_request, ref_count);
  69. struct parport_uss720_private *priv = rq->priv;
  70. unsigned long flags;
  71. if (likely(rq->urb))
  72. usb_free_urb(rq->urb);
  73. kfree(rq->dr);
  74. spin_lock_irqsave(&priv->asynclock, flags);
  75. list_del_init(&rq->asynclist);
  76. spin_unlock_irqrestore(&priv->asynclock, flags);
  77. kfree(rq);
  78. kref_put(&priv->ref_count, destroy_priv);
  79. }
  80. /* --------------------------------------------------------------------- */
  81. static void async_complete(struct urb *urb)
  82. {
  83. struct uss720_async_request *rq;
  84. struct parport *pp;
  85. struct parport_uss720_private *priv;
  86. int status = urb->status;
  87. rq = urb->context;
  88. priv = rq->priv;
  89. pp = priv->pp;
  90. if (status) {
  91. dev_err(&urb->dev->dev, "async_complete: urb error %d\n",
  92. status);
  93. } else if (rq->dr->bRequest == 3) {
  94. memcpy(priv->reg, rq->reg, sizeof(priv->reg));
  95. #if 0
  96. dev_dbg(&priv->usbdev->dev, "async_complete regs %7ph\n",
  97. priv->reg);
  98. #endif
  99. /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
  100. if (rq->reg[2] & rq->reg[1] & 0x10 && pp)
  101. parport_generic_irq(pp);
  102. }
  103. complete(&rq->compl);
  104. kref_put(&rq->ref_count, destroy_async);
  105. }
  106. static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv,
  107. __u8 request, __u8 requesttype, __u16 value, __u16 index,
  108. gfp_t mem_flags)
  109. {
  110. struct usb_device *usbdev;
  111. struct uss720_async_request *rq;
  112. unsigned long flags;
  113. int ret;
  114. if (!priv)
  115. return NULL;
  116. usbdev = priv->usbdev;
  117. if (!usbdev)
  118. return NULL;
  119. rq = kzalloc(sizeof(struct uss720_async_request), mem_flags);
  120. if (!rq)
  121. return NULL;
  122. kref_init(&rq->ref_count);
  123. INIT_LIST_HEAD(&rq->asynclist);
  124. init_completion(&rq->compl);
  125. kref_get(&priv->ref_count);
  126. rq->priv = priv;
  127. rq->urb = usb_alloc_urb(0, mem_flags);
  128. if (!rq->urb) {
  129. kref_put(&rq->ref_count, destroy_async);
  130. return NULL;
  131. }
  132. rq->dr = kmalloc(sizeof(*rq->dr), mem_flags);
  133. if (!rq->dr) {
  134. kref_put(&rq->ref_count, destroy_async);
  135. return NULL;
  136. }
  137. rq->dr->bRequestType = requesttype;
  138. rq->dr->bRequest = request;
  139. rq->dr->wValue = cpu_to_le16(value);
  140. rq->dr->wIndex = cpu_to_le16(index);
  141. rq->dr->wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0);
  142. usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0),
  143. (unsigned char *)rq->dr,
  144. (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq);
  145. /* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */
  146. spin_lock_irqsave(&priv->asynclock, flags);
  147. list_add_tail(&rq->asynclist, &priv->asynclist);
  148. spin_unlock_irqrestore(&priv->asynclock, flags);
  149. kref_get(&rq->ref_count);
  150. ret = usb_submit_urb(rq->urb, mem_flags);
  151. if (!ret)
  152. return rq;
  153. destroy_async(&rq->ref_count);
  154. dev_err(&usbdev->dev, "submit_async_request submit_urb failed with %d\n", ret);
  155. return NULL;
  156. }
  157. static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv)
  158. {
  159. struct uss720_async_request *rq;
  160. unsigned long flags;
  161. unsigned int ret = 0;
  162. spin_lock_irqsave(&priv->asynclock, flags);
  163. list_for_each_entry(rq, &priv->asynclist, asynclist) {
  164. usb_unlink_urb(rq->urb);
  165. ret++;
  166. }
  167. spin_unlock_irqrestore(&priv->asynclock, flags);
  168. return ret;
  169. }
  170. /* --------------------------------------------------------------------- */
  171. static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags)
  172. {
  173. struct parport_uss720_private *priv;
  174. struct uss720_async_request *rq;
  175. static const unsigned char regindex[9] = {
  176. 4, 0, 1, 5, 5, 0, 2, 3, 6
  177. };
  178. int ret;
  179. if (!pp)
  180. return -EIO;
  181. priv = pp->private_data;
  182. rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags);
  183. if (!rq) {
  184. dev_err(&priv->usbdev->dev, "get_1284_register(%u) failed",
  185. (unsigned int)reg);
  186. return -EIO;
  187. }
  188. if (!val) {
  189. kref_put(&rq->ref_count, destroy_async);
  190. return 0;
  191. }
  192. if (wait_for_completion_timeout(&rq->compl, HZ)) {
  193. ret = rq->urb->status;
  194. *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]];
  195. if (ret)
  196. printk(KERN_WARNING "get_1284_register: "
  197. "usb error %d\n", ret);
  198. kref_put(&rq->ref_count, destroy_async);
  199. return ret;
  200. }
  201. printk(KERN_WARNING "get_1284_register timeout\n");
  202. kill_all_async_requests_priv(priv);
  203. return -EIO;
  204. }
  205. static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags)
  206. {
  207. struct parport_uss720_private *priv;
  208. struct uss720_async_request *rq;
  209. if (!pp)
  210. return -EIO;
  211. priv = pp->private_data;
  212. rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags);
  213. if (!rq) {
  214. dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed",
  215. (unsigned int)reg, (unsigned int)val);
  216. return -EIO;
  217. }
  218. kref_put(&rq->ref_count, destroy_async);
  219. return 0;
  220. }
  221. /* --------------------------------------------------------------------- */
  222. /* ECR modes */
  223. #define ECR_SPP 00
  224. #define ECR_PS2 01
  225. #define ECR_PPF 02
  226. #define ECR_ECP 03
  227. #define ECR_EPP 04
  228. /* Safely change the mode bits in the ECR */
  229. static int change_mode(struct parport *pp, int m)
  230. {
  231. struct parport_uss720_private *priv = pp->private_data;
  232. int mode;
  233. __u8 reg;
  234. if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
  235. return -EIO;
  236. /* Bits <7:5> contain the mode. */
  237. mode = (priv->reg[2] >> 5) & 0x7;
  238. if (mode == m)
  239. return 0;
  240. /* We have to go through mode 000 or 001 */
  241. if (mode > ECR_PS2 && m > ECR_PS2)
  242. if (change_mode(pp, ECR_PS2))
  243. return -EIO;
  244. if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) {
  245. /* This mode resets the FIFO, so we may
  246. * have to wait for it to drain first. */
  247. unsigned long expire = jiffies + pp->physport->cad->timeout;
  248. switch (mode) {
  249. case ECR_PPF: /* Parallel Port FIFO mode */
  250. case ECR_ECP: /* ECP Parallel Port mode */
  251. /* Poll slowly. */
  252. for (;;) {
  253. if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
  254. return -EIO;
  255. if (priv->reg[2] & 0x01)
  256. break;
  257. if (time_after_eq (jiffies, expire))
  258. /* The FIFO is stuck. */
  259. return -EBUSY;
  260. msleep_interruptible(10);
  261. if (signal_pending (current))
  262. break;
  263. }
  264. }
  265. }
  266. /* Set the mode. */
  267. if (set_1284_register(pp, 6, m << 5, GFP_KERNEL))
  268. return -EIO;
  269. if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
  270. return -EIO;
  271. return 0;
  272. }
  273. /*
  274. * Clear TIMEOUT BIT in EPP MODE
  275. */
  276. static int clear_epp_timeout(struct parport *pp)
  277. {
  278. unsigned char stat;
  279. if (get_1284_register(pp, 1, &stat, GFP_KERNEL))
  280. return 1;
  281. return stat & 1;
  282. }
  283. /*
  284. * Access functions.
  285. */
  286. #if 0
  287. static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id)
  288. {
  289. struct parport *pp = (struct parport *)dev_id;
  290. struct parport_uss720_private *priv = pp->private_data;
  291. if (usbstatus != 0 || len < 4 || !buffer)
  292. return 1;
  293. memcpy(priv->reg, buffer, 4);
  294. /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
  295. if (priv->reg[2] & priv->reg[1] & 0x10)
  296. parport_generic_irq(pp);
  297. return 1;
  298. }
  299. #endif
  300. static void parport_uss720_write_data(struct parport *pp, unsigned char d)
  301. {
  302. set_1284_register(pp, 0, d, GFP_KERNEL);
  303. }
  304. static unsigned char parport_uss720_read_data(struct parport *pp)
  305. {
  306. unsigned char ret;
  307. if (get_1284_register(pp, 0, &ret, GFP_KERNEL))
  308. return 0;
  309. return ret;
  310. }
  311. static void parport_uss720_write_control(struct parport *pp, unsigned char d)
  312. {
  313. struct parport_uss720_private *priv = pp->private_data;
  314. d = (d & 0xf) | (priv->reg[1] & 0xf0);
  315. if (set_1284_register(pp, 2, d, GFP_KERNEL))
  316. return;
  317. priv->reg[1] = d;
  318. }
  319. static unsigned char parport_uss720_read_control(struct parport *pp)
  320. {
  321. struct parport_uss720_private *priv = pp->private_data;
  322. return priv->reg[1] & 0xf; /* Use soft copy */
  323. }
  324. static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val)
  325. {
  326. struct parport_uss720_private *priv = pp->private_data;
  327. unsigned char d;
  328. mask &= 0x0f;
  329. val &= 0x0f;
  330. d = (priv->reg[1] & (~mask)) ^ val;
  331. if (set_1284_register(pp, 2, d, GFP_ATOMIC))
  332. return 0;
  333. priv->reg[1] = d;
  334. return d & 0xf;
  335. }
  336. static unsigned char parport_uss720_read_status(struct parport *pp)
  337. {
  338. unsigned char ret;
  339. if (get_1284_register(pp, 1, &ret, GFP_ATOMIC))
  340. return 0;
  341. return ret & 0xf8;
  342. }
  343. static void parport_uss720_disable_irq(struct parport *pp)
  344. {
  345. struct parport_uss720_private *priv = pp->private_data;
  346. unsigned char d;
  347. d = priv->reg[1] & ~0x10;
  348. if (set_1284_register(pp, 2, d, GFP_KERNEL))
  349. return;
  350. priv->reg[1] = d;
  351. }
  352. static void parport_uss720_enable_irq(struct parport *pp)
  353. {
  354. struct parport_uss720_private *priv = pp->private_data;
  355. unsigned char d;
  356. d = priv->reg[1] | 0x10;
  357. if (set_1284_register(pp, 2, d, GFP_KERNEL))
  358. return;
  359. priv->reg[1] = d;
  360. }
  361. static void parport_uss720_data_forward (struct parport *pp)
  362. {
  363. struct parport_uss720_private *priv = pp->private_data;
  364. unsigned char d;
  365. d = priv->reg[1] & ~0x20;
  366. if (set_1284_register(pp, 2, d, GFP_KERNEL))
  367. return;
  368. priv->reg[1] = d;
  369. }
  370. static void parport_uss720_data_reverse (struct parport *pp)
  371. {
  372. struct parport_uss720_private *priv = pp->private_data;
  373. unsigned char d;
  374. d = priv->reg[1] | 0x20;
  375. if (set_1284_register(pp, 2, d, GFP_KERNEL))
  376. return;
  377. priv->reg[1] = d;
  378. }
  379. static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s)
  380. {
  381. s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
  382. s->u.pc.ecr = 0x24;
  383. }
  384. static void parport_uss720_save_state(struct parport *pp, struct parport_state *s)
  385. {
  386. struct parport_uss720_private *priv = pp->private_data;
  387. #if 0
  388. if (get_1284_register(pp, 2, NULL, GFP_ATOMIC))
  389. return;
  390. #endif
  391. s->u.pc.ctr = priv->reg[1];
  392. s->u.pc.ecr = priv->reg[2];
  393. }
  394. static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s)
  395. {
  396. struct parport_uss720_private *priv = pp->private_data;
  397. set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC);
  398. set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC);
  399. get_1284_register(pp, 2, NULL, GFP_ATOMIC);
  400. priv->reg[1] = s->u.pc.ctr;
  401. priv->reg[2] = s->u.pc.ecr;
  402. }
  403. static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags)
  404. {
  405. struct parport_uss720_private *priv = pp->private_data;
  406. size_t got = 0;
  407. if (change_mode(pp, ECR_EPP))
  408. return 0;
  409. for (; got < length; got++) {
  410. if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
  411. break;
  412. buf++;
  413. if (priv->reg[0] & 0x01) {
  414. clear_epp_timeout(pp);
  415. break;
  416. }
  417. }
  418. change_mode(pp, ECR_PS2);
  419. return got;
  420. }
  421. static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags)
  422. {
  423. #if 0
  424. struct parport_uss720_private *priv = pp->private_data;
  425. size_t written = 0;
  426. if (change_mode(pp, ECR_EPP))
  427. return 0;
  428. for (; written < length; written++) {
  429. if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
  430. break;
  431. ((char*)buf)++;
  432. if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
  433. break;
  434. if (priv->reg[0] & 0x01) {
  435. clear_epp_timeout(pp);
  436. break;
  437. }
  438. }
  439. change_mode(pp, ECR_PS2);
  440. return written;
  441. #else
  442. struct parport_uss720_private *priv = pp->private_data;
  443. struct usb_device *usbdev = priv->usbdev;
  444. int rlen;
  445. int i;
  446. if (!usbdev)
  447. return 0;
  448. if (change_mode(pp, ECR_EPP))
  449. return 0;
  450. i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000);
  451. if (i)
  452. printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buf, length, rlen);
  453. change_mode(pp, ECR_PS2);
  454. return rlen;
  455. #endif
  456. }
  457. static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags)
  458. {
  459. struct parport_uss720_private *priv = pp->private_data;
  460. size_t got = 0;
  461. if (change_mode(pp, ECR_EPP))
  462. return 0;
  463. for (; got < length; got++) {
  464. if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL))
  465. break;
  466. buf++;
  467. if (priv->reg[0] & 0x01) {
  468. clear_epp_timeout(pp);
  469. break;
  470. }
  471. }
  472. change_mode(pp, ECR_PS2);
  473. return got;
  474. }
  475. static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags)
  476. {
  477. struct parport_uss720_private *priv = pp->private_data;
  478. size_t written = 0;
  479. if (change_mode(pp, ECR_EPP))
  480. return 0;
  481. for (; written < length; written++) {
  482. if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL))
  483. break;
  484. buf++;
  485. if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
  486. break;
  487. if (priv->reg[0] & 0x01) {
  488. clear_epp_timeout(pp);
  489. break;
  490. }
  491. }
  492. change_mode(pp, ECR_PS2);
  493. return written;
  494. }
  495. static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags)
  496. {
  497. struct parport_uss720_private *priv = pp->private_data;
  498. struct usb_device *usbdev = priv->usbdev;
  499. int rlen;
  500. int i;
  501. if (!usbdev)
  502. return 0;
  503. if (change_mode(pp, ECR_ECP))
  504. return 0;
  505. i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
  506. if (i)
  507. printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen);
  508. change_mode(pp, ECR_PS2);
  509. return rlen;
  510. }
  511. static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags)
  512. {
  513. struct parport_uss720_private *priv = pp->private_data;
  514. struct usb_device *usbdev = priv->usbdev;
  515. int rlen;
  516. int i;
  517. if (!usbdev)
  518. return 0;
  519. if (change_mode(pp, ECR_ECP))
  520. return 0;
  521. i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000);
  522. if (i)
  523. printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %zu rlen %u\n", buffer, len, rlen);
  524. change_mode(pp, ECR_PS2);
  525. return rlen;
  526. }
  527. static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags)
  528. {
  529. size_t written = 0;
  530. if (change_mode(pp, ECR_ECP))
  531. return 0;
  532. for (; written < len; written++) {
  533. if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL))
  534. break;
  535. buffer++;
  536. }
  537. change_mode(pp, ECR_PS2);
  538. return written;
  539. }
  540. static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags)
  541. {
  542. struct parport_uss720_private *priv = pp->private_data;
  543. struct usb_device *usbdev = priv->usbdev;
  544. int rlen;
  545. int i;
  546. if (!usbdev)
  547. return 0;
  548. if (change_mode(pp, ECR_PPF))
  549. return 0;
  550. i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
  551. if (i)
  552. printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen);
  553. change_mode(pp, ECR_PS2);
  554. return rlen;
  555. }
  556. /* --------------------------------------------------------------------- */
  557. static struct parport_operations parport_uss720_ops =
  558. {
  559. .owner = THIS_MODULE,
  560. .write_data = parport_uss720_write_data,
  561. .read_data = parport_uss720_read_data,
  562. .write_control = parport_uss720_write_control,
  563. .read_control = parport_uss720_read_control,
  564. .frob_control = parport_uss720_frob_control,
  565. .read_status = parport_uss720_read_status,
  566. .enable_irq = parport_uss720_enable_irq,
  567. .disable_irq = parport_uss720_disable_irq,
  568. .data_forward = parport_uss720_data_forward,
  569. .data_reverse = parport_uss720_data_reverse,
  570. .init_state = parport_uss720_init_state,
  571. .save_state = parport_uss720_save_state,
  572. .restore_state = parport_uss720_restore_state,
  573. .epp_write_data = parport_uss720_epp_write_data,
  574. .epp_read_data = parport_uss720_epp_read_data,
  575. .epp_write_addr = parport_uss720_epp_write_addr,
  576. .epp_read_addr = parport_uss720_epp_read_addr,
  577. .ecp_write_data = parport_uss720_ecp_write_data,
  578. .ecp_read_data = parport_uss720_ecp_read_data,
  579. .ecp_write_addr = parport_uss720_ecp_write_addr,
  580. .compat_write_data = parport_uss720_write_compat,
  581. .nibble_read_data = parport_ieee1284_read_nibble,
  582. .byte_read_data = parport_ieee1284_read_byte,
  583. };
  584. /* --------------------------------------------------------------------- */
  585. static int uss720_probe(struct usb_interface *intf,
  586. const struct usb_device_id *id)
  587. {
  588. struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf));
  589. struct usb_host_interface *interface;
  590. struct usb_endpoint_descriptor *epd;
  591. struct parport_uss720_private *priv;
  592. struct parport *pp;
  593. unsigned char reg;
  594. int i;
  595. dev_dbg(&intf->dev, "probe: vendor id 0x%x, device id 0x%x\n",
  596. le16_to_cpu(usbdev->descriptor.idVendor),
  597. le16_to_cpu(usbdev->descriptor.idProduct));
  598. /* our known interfaces have 3 alternate settings */
  599. if (intf->num_altsetting != 3) {
  600. usb_put_dev(usbdev);
  601. return -ENODEV;
  602. }
  603. i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2);
  604. dev_dbg(&intf->dev, "set interface result %d\n", i);
  605. interface = intf->cur_altsetting;
  606. if (interface->desc.bNumEndpoints < 3) {
  607. usb_put_dev(usbdev);
  608. return -ENODEV;
  609. }
  610. /*
  611. * Allocate parport interface
  612. */
  613. priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL);
  614. if (!priv) {
  615. usb_put_dev(usbdev);
  616. return -ENOMEM;
  617. }
  618. priv->pp = NULL;
  619. priv->usbdev = usbdev;
  620. kref_init(&priv->ref_count);
  621. spin_lock_init(&priv->asynclock);
  622. INIT_LIST_HEAD(&priv->asynclist);
  623. pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops);
  624. if (!pp) {
  625. printk(KERN_WARNING "uss720: could not register parport\n");
  626. goto probe_abort;
  627. }
  628. priv->pp = pp;
  629. pp->private_data = priv;
  630. pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT;
  631. /* set the USS720 control register to manual mode, no ECP compression, enable all ints */
  632. set_1284_register(pp, 7, 0x00, GFP_KERNEL);
  633. set_1284_register(pp, 6, 0x30, GFP_KERNEL); /* PS/2 mode */
  634. set_1284_register(pp, 2, 0x0c, GFP_KERNEL);
  635. /* debugging */
  636. get_1284_register(pp, 0, &reg, GFP_KERNEL);
  637. dev_dbg(&intf->dev, "reg: %7ph\n", priv->reg);
  638. i = usb_find_last_int_in_endpoint(interface, &epd);
  639. if (!i) {
  640. dev_dbg(&intf->dev, "epaddr %d interval %d\n",
  641. epd->bEndpointAddress, epd->bInterval);
  642. }
  643. parport_announce_port(pp);
  644. usb_set_intfdata(intf, pp);
  645. return 0;
  646. probe_abort:
  647. kill_all_async_requests_priv(priv);
  648. kref_put(&priv->ref_count, destroy_priv);
  649. return -ENODEV;
  650. }
  651. static void uss720_disconnect(struct usb_interface *intf)
  652. {
  653. struct parport *pp = usb_get_intfdata(intf);
  654. struct parport_uss720_private *priv;
  655. dev_dbg(&intf->dev, "disconnect\n");
  656. usb_set_intfdata(intf, NULL);
  657. if (pp) {
  658. priv = pp->private_data;
  659. priv->usbdev = NULL;
  660. priv->pp = NULL;
  661. dev_dbg(&intf->dev, "parport_remove_port\n");
  662. parport_remove_port(pp);
  663. parport_put_port(pp);
  664. kill_all_async_requests_priv(priv);
  665. kref_put(&priv->ref_count, destroy_priv);
  666. }
  667. dev_dbg(&intf->dev, "disconnect done\n");
  668. }
  669. /* table of cables that work through this driver */
  670. static const struct usb_device_id uss720_table[] = {
  671. { USB_DEVICE(0x047e, 0x1001) },
  672. { USB_DEVICE(0x04b8, 0x0002) },
  673. { USB_DEVICE(0x04b8, 0x0003) },
  674. { USB_DEVICE(0x050d, 0x0002) },
  675. { USB_DEVICE(0x050d, 0x1202) },
  676. { USB_DEVICE(0x0557, 0x2001) },
  677. { USB_DEVICE(0x05ab, 0x0002) },
  678. { USB_DEVICE(0x06c6, 0x0100) },
  679. { USB_DEVICE(0x0729, 0x1284) },
  680. { USB_DEVICE(0x1293, 0x0002) },
  681. { } /* Terminating entry */
  682. };
  683. MODULE_DEVICE_TABLE (usb, uss720_table);
  684. static struct usb_driver uss720_driver = {
  685. .name = "uss720",
  686. .probe = uss720_probe,
  687. .disconnect = uss720_disconnect,
  688. .id_table = uss720_table,
  689. };
  690. /* --------------------------------------------------------------------- */
  691. MODULE_AUTHOR(DRIVER_AUTHOR);
  692. MODULE_DESCRIPTION(DRIVER_DESC);
  693. MODULE_LICENSE("GPL");
  694. static int __init uss720_init(void)
  695. {
  696. int retval;
  697. retval = usb_register(&uss720_driver);
  698. if (retval)
  699. goto out;
  700. printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
  701. printk(KERN_INFO KBUILD_MODNAME ": NOTE: this is a special purpose "
  702. "driver to allow nonstandard\n");
  703. printk(KERN_INFO KBUILD_MODNAME ": protocols (eg. bitbang) over "
  704. "USS720 usb to parallel cables\n");
  705. printk(KERN_INFO KBUILD_MODNAME ": If you just want to connect to a "
  706. "printer, use usblp instead\n");
  707. out:
  708. return retval;
  709. }
  710. static void __exit uss720_cleanup(void)
  711. {
  712. usb_deregister(&uss720_driver);
  713. }
  714. module_init(uss720_init);
  715. module_exit(uss720_cleanup);
  716. /* --------------------------------------------------------------------- */