?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / greybus / es2.c
blob366716f11b1a5087a6263fe5f0d9d08873839848
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Greybus "AP" USB driver for "ES2" controller chips
4 *
5 * Copyright 2014-2015 Google Inc.
6 * Copyright 2014-2015 Linaro Ltd.
7 */
8 #include <linux/kthread.h>
9 #include <linux/sizes.h>
10 #include <linux/usb.h>
11 #include <linux/kfifo.h>
12 #include <linux/debugfs.h>
13 #include <linux/list.h>
14 #include <linux/greybus.h>
15 #include <asm/unaligned.h>
16
17 #include "arpc.h"
18 #include "greybus_trace.h"
19
20
21 /* Default timeout for USB vendor requests. */
22 #define ES2_USB_CTRL_TIMEOUT 500
23
24 /* Default timeout for ARPC CPort requests */
25 #define ES2_ARPC_CPORT_TIMEOUT 500
26
27 /* Fixed CPort numbers */
28 #define ES2_CPORT_CDSI0 16
29 #define ES2_CPORT_CDSI1 17
30
31 /* Memory sizes for the buffers sent to/from the ES2 controller */
32 #define ES2_GBUF_MSG_SIZE_MAX 2048
33
34 /* Memory sizes for the ARPC buffers */
35 #define ARPC_OUT_SIZE_MAX U16_MAX
36 #define ARPC_IN_SIZE_MAX 128
37
38 static const struct usb_device_id id_table[] = {
39 { USB_DEVICE(0x18d1, 0x1eaf) },
40 { },
41 };
42 MODULE_DEVICE_TABLE(usb, id_table);
43
44 #define APB1_LOG_SIZE SZ_16K
45
46 /*
47 * Number of CPort IN urbs in flight at any point in time.
48 * Adjust if we are having stalls in the USB buffer due to not enough urbs in
49 * flight.
50 */
51 #define NUM_CPORT_IN_URB 4
52
53 /* Number of CPort OUT urbs in flight at any point in time.
54 * Adjust if we get messages saying we are out of urbs in the system log.
55 */
56 #define NUM_CPORT_OUT_URB 8
57
58 /*
59 * Number of ARPC in urbs in flight at any point in time.
60 */
61 #define NUM_ARPC_IN_URB 2
62
63 /*
64 * @endpoint: bulk in endpoint for CPort data
65 * @urb: array of urbs for the CPort in messages
66 * @buffer: array of buffers for the @cport_in_urb urbs
67 */
68 struct es2_cport_in {
69 __u8 endpoint;
70 struct urb *urb[NUM_CPORT_IN_URB];
71 u8 *buffer[NUM_CPORT_IN_URB];
72 };
73
74 /**
75 * es2_ap_dev - ES2 USB Bridge to AP structure
76 * @usb_dev: pointer to the USB device we are.
77 * @usb_intf: pointer to the USB interface we are bound to.
78 * @hd: pointer to our gb_host_device structure
79
80 * @cport_in: endpoint, urbs and buffer for cport in messages
81 * @cport_out_endpoint: endpoint for for cport out messages
82 * @cport_out_urb: array of urbs for the CPort out messages
83 * @cport_out_urb_busy: array of flags to see if the @cport_out_urb is busy or
84 * not.
85 * @cport_out_urb_cancelled: array of flags indicating whether the
86 * corresponding @cport_out_urb is being cancelled
87 * @cport_out_urb_lock: locks the @cport_out_urb_busy "list"
88 *
89 * @apb_log_task: task pointer for logging thread
90 * @apb_log_dentry: file system entry for the log file interface
91 * @apb_log_enable_dentry: file system entry for enabling logging
92 * @apb_log_fifo: kernel FIFO to carry logged data
93 * @arpc_urb: array of urbs for the ARPC in messages
94 * @arpc_buffer: array of buffers for the @arpc_urb urbs
95 * @arpc_endpoint_in: bulk in endpoint for APBridgeA RPC
96 * @arpc_id_cycle: gives an unique id to ARPC
97 * @arpc_lock: locks ARPC list
98 * @arpcs: list of in progress ARPCs
99 */
100 struct es2_ap_dev {
101 struct usb_device *usb_dev;
102 struct usb_interface *usb_intf;
103 struct gb_host_device *hd;
104
105 struct es2_cport_in cport_in;
106 __u8 cport_out_endpoint;
107 struct urb *cport_out_urb[NUM_CPORT_OUT_URB];
108 bool cport_out_urb_busy[NUM_CPORT_OUT_URB];
109 bool cport_out_urb_cancelled[NUM_CPORT_OUT_URB];
110 spinlock_t cport_out_urb_lock;
111
112 bool cdsi1_in_use;
113
114 struct task_struct *apb_log_task;
115 struct dentry *apb_log_dentry;
116 struct dentry *apb_log_enable_dentry;
117 DECLARE_KFIFO(apb_log_fifo, char, APB1_LOG_SIZE);
118
119 __u8 arpc_endpoint_in;
120 struct urb *arpc_urb[NUM_ARPC_IN_URB];
121 u8 *arpc_buffer[NUM_ARPC_IN_URB];
122
123 int arpc_id_cycle;
124 spinlock_t arpc_lock;
125 struct list_head arpcs;
126 };
127
128 struct arpc {
129 struct list_head list;
130 struct arpc_request_message *req;
131 struct arpc_response_message *resp;
132 struct completion response_received;
133 bool active;
134 };
135
136 static inline struct es2_ap_dev *hd_to_es2(struct gb_host_device *hd)
137 {
138 return (struct es2_ap_dev *)&hd->hd_priv;
139 }
140
141 static void cport_out_callback(struct urb *urb);
142 static void usb_log_enable(struct es2_ap_dev *es2);
143 static void usb_log_disable(struct es2_ap_dev *es2);
144 static int arpc_sync(struct es2_ap_dev *es2, u8 type, void *payload,
145 size_t size, int *result, unsigned int timeout);
146
147 static int output_sync(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd)
148 {
149 struct usb_device *udev = es2->usb_dev;
150 u8 *data;
151 int retval;
152
153 data = kmemdup(req, size, GFP_KERNEL);
154 if (!data)
155 return -ENOMEM;
156
157 retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
158 cmd,
159 USB_DIR_OUT | USB_TYPE_VENDOR |
160 USB_RECIP_INTERFACE,
161 0, 0, data, size, ES2_USB_CTRL_TIMEOUT);
162 if (retval < 0)
163 dev_err(&udev->dev, "%s: return error %d\n", __func__, retval);
164 else
165 retval = 0;
166
167 kfree(data);
168 return retval;
169 }
170
171 static void ap_urb_complete(struct urb *urb)
172 {
173 struct usb_ctrlrequest *dr = urb->context;
174
175 kfree(dr);
176 usb_free_urb(urb);
177 }
178
179 static int output_async(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd)
180 {
181 struct usb_device *udev = es2->usb_dev;
182 struct urb *urb;
183 struct usb_ctrlrequest *dr;
184 u8 *buf;
185 int retval;
186
187 urb = usb_alloc_urb(0, GFP_ATOMIC);
188 if (!urb)
189 return -ENOMEM;
190
191 dr = kmalloc(sizeof(*dr) + size, GFP_ATOMIC);
192 if (!dr) {
193 usb_free_urb(urb);
194 return -ENOMEM;
195 }
196
197 buf = (u8 *)dr + sizeof(*dr);
198 memcpy(buf, req, size);
199
200 dr->bRequest = cmd;
201 dr->bRequestType = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE;
202 dr->wValue = 0;
203 dr->wIndex = 0;
204 dr->wLength = cpu_to_le16(size);
205
206 usb_fill_control_urb(urb, udev, usb_sndctrlpipe(udev, 0),
207 (unsigned char *)dr, buf, size,
208 ap_urb_complete, dr);
209 retval = usb_submit_urb(urb, GFP_ATOMIC);
210 if (retval) {
211 usb_free_urb(urb);
212 kfree(dr);
213 }
214 return retval;
215 }
216
217 static int output(struct gb_host_device *hd, void *req, u16 size, u8 cmd,
218 bool async)
219 {
220 struct es2_ap_dev *es2 = hd_to_es2(hd);
221
222 if (async)
223 return output_async(es2, req, size, cmd);
224
225 return output_sync(es2, req, size, cmd);
226 }
227
228 static int es2_cport_in_enable(struct es2_ap_dev *es2,
229 struct es2_cport_in *cport_in)
230 {
231 struct urb *urb;
232 int ret;
233 int i;
234
235 for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
236 urb = cport_in->urb[i];
237
238 ret = usb_submit_urb(urb, GFP_KERNEL);
239 if (ret) {
240 dev_err(&es2->usb_dev->dev,
241 "failed to submit in-urb: %d\n", ret);
242 goto err_kill_urbs;
243 }
244 }
245
246 return 0;
247
248 err_kill_urbs:
249 for (--i; i >= 0; --i) {
250 urb = cport_in->urb[i];
251 usb_kill_urb(urb);
252 }
253
254 return ret;
255 }
256
257 static void es2_cport_in_disable(struct es2_ap_dev *es2,
258 struct es2_cport_in *cport_in)
259 {
260 struct urb *urb;
261 int i;
262
263 for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
264 urb = cport_in->urb[i];
265 usb_kill_urb(urb);
266 }
267 }
268
269 static int es2_arpc_in_enable(struct es2_ap_dev *es2)
270 {
271 struct urb *urb;
272 int ret;
273 int i;
274
275 for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
276 urb = es2->arpc_urb[i];
277
278 ret = usb_submit_urb(urb, GFP_KERNEL);
279 if (ret) {
280 dev_err(&es2->usb_dev->dev,
281 "failed to submit arpc in-urb: %d\n", ret);
282 goto err_kill_urbs;
283 }
284 }
285
286 return 0;
287
288 err_kill_urbs:
289 for (--i; i >= 0; --i) {
290 urb = es2->arpc_urb[i];
291 usb_kill_urb(urb);
292 }
293
294 return ret;
295 }
296
297 static void es2_arpc_in_disable(struct es2_ap_dev *es2)
298 {
299 struct urb *urb;
300 int i;
301
302 for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
303 urb = es2->arpc_urb[i];
304 usb_kill_urb(urb);
305 }
306 }
307
308 static struct urb *next_free_urb(struct es2_ap_dev *es2, gfp_t gfp_mask)
309 {
310 struct urb *urb = NULL;
311 unsigned long flags;
312 int i;
313
314 spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
315
316 /* Look in our pool of allocated urbs first, as that's the "fastest" */
317 for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
318 if (!es2->cport_out_urb_busy[i] &&
319 !es2->cport_out_urb_cancelled[i]) {
320 es2->cport_out_urb_busy[i] = true;
321 urb = es2->cport_out_urb[i];
322 break;
323 }
324 }
325 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
326 if (urb)
327 return urb;
328
329 /*
330 * Crap, pool is empty, complain to the syslog and go allocate one
331 * dynamically as we have to succeed.
332 */
333 dev_dbg(&es2->usb_dev->dev,
334 "No free CPort OUT urbs, having to dynamically allocate one!\n");
335 return usb_alloc_urb(0, gfp_mask);
336 }
337
338 static void free_urb(struct es2_ap_dev *es2, struct urb *urb)
339 {
340 unsigned long flags;
341 int i;
342 /*
343 * See if this was an urb in our pool, if so mark it "free", otherwise
344 * we need to free it ourselves.
345 */
346 spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
347 for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
348 if (urb == es2->cport_out_urb[i]) {
349 es2->cport_out_urb_busy[i] = false;
350 urb = NULL;
351 break;
352 }
353 }
354 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
355
356 /* If urb is not NULL, then we need to free this urb */
357 usb_free_urb(urb);
358 }
359
360 /*
361 * We (ab)use the operation-message header pad bytes to transfer the
362 * cport id in order to minimise overhead.
363 */
364 static void
365 gb_message_cport_pack(struct gb_operation_msg_hdr *header, u16 cport_id)
366 {
367 header->pad[0] = cport_id;
368 }
369
370 /* Clear the pad bytes used for the CPort id */
371 static void gb_message_cport_clear(struct gb_operation_msg_hdr *header)
372 {
373 header->pad[0] = 0;
374 }
375
376 /* Extract the CPort id packed into the header, and clear it */
377 static u16 gb_message_cport_unpack(struct gb_operation_msg_hdr *header)
378 {
379 u16 cport_id = header->pad[0];
380
381 gb_message_cport_clear(header);
382
383 return cport_id;
384 }
385
386 /*
387 * Returns zero if the message was successfully queued, or a negative errno
388 * otherwise.
389 */
390 static int message_send(struct gb_host_device *hd, u16 cport_id,
391 struct gb_message *message, gfp_t gfp_mask)
392 {
393 struct es2_ap_dev *es2 = hd_to_es2(hd);
394 struct usb_device *udev = es2->usb_dev;
395 size_t buffer_size;
396 int retval;
397 struct urb *urb;
398 unsigned long flags;
399
400 /*
401 * The data actually transferred will include an indication
402 * of where the data should be sent. Do one last check of
403 * the target CPort id before filling it in.
404 */
405 if (!cport_id_valid(hd, cport_id)) {
406 dev_err(&udev->dev, "invalid cport %u\n", cport_id);
407 return -EINVAL;
408 }
409
410 /* Find a free urb */
411 urb = next_free_urb(es2, gfp_mask);
412 if (!urb)
413 return -ENOMEM;
414
415 spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
416 message->hcpriv = urb;
417 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
418
419 /* Pack the cport id into the message header */
420 gb_message_cport_pack(message->header, cport_id);
421
422 buffer_size = sizeof(*message->header) + message->payload_size;
423
424 usb_fill_bulk_urb(urb, udev,
425 usb_sndbulkpipe(udev,
426 es2->cport_out_endpoint),
427 message->buffer, buffer_size,
428 cport_out_callback, message);
429 urb->transfer_flags |= URB_ZERO_PACKET;
430
431 trace_gb_message_submit(message);
432
433 retval = usb_submit_urb(urb, gfp_mask);
434 if (retval) {
435 dev_err(&udev->dev, "failed to submit out-urb: %d\n", retval);
436
437 spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
438 message->hcpriv = NULL;
439 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
440
441 free_urb(es2, urb);
442 gb_message_cport_clear(message->header);
443
444 return retval;
445 }
446
447 return 0;
448 }
449
450 /*
451 * Can not be called in atomic context.
452 */
453 static void message_cancel(struct gb_message *message)
454 {
455 struct gb_host_device *hd = message->operation->connection->hd;
456 struct es2_ap_dev *es2 = hd_to_es2(hd);
457 struct urb *urb;
458 int i;
459
460 might_sleep();
461
462 spin_lock_irq(&es2->cport_out_urb_lock);
463 urb = message->hcpriv;
464
465 /* Prevent dynamically allocated urb from being deallocated. */
466 usb_get_urb(urb);
467
468 /* Prevent pre-allocated urb from being reused. */
469 for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
470 if (urb == es2->cport_out_urb[i]) {
471 es2->cport_out_urb_cancelled[i] = true;
472 break;
473 }
474 }
475 spin_unlock_irq(&es2->cport_out_urb_lock);
476
477 usb_kill_urb(urb);
478
479 if (i < NUM_CPORT_OUT_URB) {
480 spin_lock_irq(&es2->cport_out_urb_lock);
481 es2->cport_out_urb_cancelled[i] = false;
482 spin_unlock_irq(&es2->cport_out_urb_lock);
483 }
484
485 usb_free_urb(urb);
486 }
487
488 static int es2_cport_allocate(struct gb_host_device *hd, int cport_id,
489 unsigned long flags)
490 {
491 struct es2_ap_dev *es2 = hd_to_es2(hd);
492 struct ida *id_map = &hd->cport_id_map;
493 int ida_start, ida_end;
494
495 switch (cport_id) {
496 case ES2_CPORT_CDSI0:
497 case ES2_CPORT_CDSI1:
498 dev_err(&hd->dev, "cport %d not available\n", cport_id);
499 return -EBUSY;
500 }
501
502 if (flags & GB_CONNECTION_FLAG_OFFLOADED &&
503 flags & GB_CONNECTION_FLAG_CDSI1) {
504 if (es2->cdsi1_in_use) {
505 dev_err(&hd->dev, "CDSI1 already in use\n");
506 return -EBUSY;
507 }
508
509 es2->cdsi1_in_use = true;
510
511 return ES2_CPORT_CDSI1;
512 }
513
514 if (cport_id < 0) {
515 ida_start = 0;
516 ida_end = hd->num_cports;
517 } else if (cport_id < hd->num_cports) {
518 ida_start = cport_id;
519 ida_end = cport_id + 1;
520 } else {
521 dev_err(&hd->dev, "cport %d not available\n", cport_id);
522 return -EINVAL;
523 }
524
525 return ida_simple_get(id_map, ida_start, ida_end, GFP_KERNEL);
526 }
527
528 static void es2_cport_release(struct gb_host_device *hd, u16 cport_id)
529 {
530 struct es2_ap_dev *es2 = hd_to_es2(hd);
531
532 switch (cport_id) {
533 case ES2_CPORT_CDSI1:
534 es2->cdsi1_in_use = false;
535 return;
536 }
537
538 ida_simple_remove(&hd->cport_id_map, cport_id);
539 }
540
541 static int cport_enable(struct gb_host_device *hd, u16 cport_id,
542 unsigned long flags)
543 {
544 struct es2_ap_dev *es2 = hd_to_es2(hd);
545 struct usb_device *udev = es2->usb_dev;
546 struct gb_apb_request_cport_flags *req;
547 u32 connection_flags;
548 int ret;
549
550 req = kzalloc(sizeof(*req), GFP_KERNEL);
551 if (!req)
552 return -ENOMEM;
553
554 connection_flags = 0;
555 if (flags & GB_CONNECTION_FLAG_CONTROL)
556 connection_flags |= GB_APB_CPORT_FLAG_CONTROL;
557 if (flags & GB_CONNECTION_FLAG_HIGH_PRIO)
558 connection_flags |= GB_APB_CPORT_FLAG_HIGH_PRIO;
559
560 req->flags = cpu_to_le32(connection_flags);
561
562 dev_dbg(&hd->dev, "%s - cport = %u, flags = %02x\n", __func__,
563 cport_id, connection_flags);
564
565 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
566 GB_APB_REQUEST_CPORT_FLAGS,
567 USB_DIR_OUT | USB_TYPE_VENDOR |
568 USB_RECIP_INTERFACE, cport_id, 0,
569 req, sizeof(*req), ES2_USB_CTRL_TIMEOUT);
570 if (ret != sizeof(*req)) {
571 dev_err(&udev->dev, "failed to set cport flags for port %d\n",
572 cport_id);
573 if (ret >= 0)
574 ret = -EIO;
575
576 goto out;
577 }
578
579 ret = 0;
580 out:
581 kfree(req);
582
583 return ret;
584 }
585
586 static int es2_cport_connected(struct gb_host_device *hd, u16 cport_id)
587 {
588 struct es2_ap_dev *es2 = hd_to_es2(hd);
589 struct device *dev = &es2->usb_dev->dev;
590 struct arpc_cport_connected_req req;
591 int ret;
592
593 req.cport_id = cpu_to_le16(cport_id);
594 ret = arpc_sync(es2, ARPC_TYPE_CPORT_CONNECTED, &req, sizeof(req),
595 NULL, ES2_ARPC_CPORT_TIMEOUT);
596 if (ret) {
597 dev_err(dev, "failed to set connected state for cport %u: %d\n",
598 cport_id, ret);
599 return ret;
600 }
601
602 return 0;
603 }
604
605 static int es2_cport_flush(struct gb_host_device *hd, u16 cport_id)
606 {
607 struct es2_ap_dev *es2 = hd_to_es2(hd);
608 struct device *dev = &es2->usb_dev->dev;
609 struct arpc_cport_flush_req req;
610 int ret;
611
612 req.cport_id = cpu_to_le16(cport_id);
613 ret = arpc_sync(es2, ARPC_TYPE_CPORT_FLUSH, &req, sizeof(req),
614 NULL, ES2_ARPC_CPORT_TIMEOUT);
615 if (ret) {
616 dev_err(dev, "failed to flush cport %u: %d\n", cport_id, ret);
617 return ret;
618 }
619
620 return 0;
621 }
622
623 static int es2_cport_shutdown(struct gb_host_device *hd, u16 cport_id,
624 u8 phase, unsigned int timeout)
625 {
626 struct es2_ap_dev *es2 = hd_to_es2(hd);
627 struct device *dev = &es2->usb_dev->dev;
628 struct arpc_cport_shutdown_req req;
629 int result;
630 int ret;
631
632 if (timeout > U16_MAX)
633 return -EINVAL;
634
635 req.cport_id = cpu_to_le16(cport_id);
636 req.timeout = cpu_to_le16(timeout);
637 req.phase = phase;
638 ret = arpc_sync(es2, ARPC_TYPE_CPORT_SHUTDOWN, &req, sizeof(req),
639 &result, ES2_ARPC_CPORT_TIMEOUT + timeout);
640 if (ret) {
641 dev_err(dev, "failed to send shutdown over cport %u: %d (%d)\n",
642 cport_id, ret, result);
643 return ret;
644 }
645
646 return 0;
647 }
648
649 static int es2_cport_quiesce(struct gb_host_device *hd, u16 cport_id,
650 size_t peer_space, unsigned int timeout)
651 {
652 struct es2_ap_dev *es2 = hd_to_es2(hd);
653 struct device *dev = &es2->usb_dev->dev;
654 struct arpc_cport_quiesce_req req;
655 int result;
656 int ret;
657
658 if (peer_space > U16_MAX)
659 return -EINVAL;
660
661 if (timeout > U16_MAX)
662 return -EINVAL;
663
664 req.cport_id = cpu_to_le16(cport_id);
665 req.peer_space = cpu_to_le16(peer_space);
666 req.timeout = cpu_to_le16(timeout);
667 ret = arpc_sync(es2, ARPC_TYPE_CPORT_QUIESCE, &req, sizeof(req),
668 &result, ES2_ARPC_CPORT_TIMEOUT + timeout);
669 if (ret) {
670 dev_err(dev, "failed to quiesce cport %u: %d (%d)\n",
671 cport_id, ret, result);
672 return ret;
673 }
674
675 return 0;
676 }
677
678 static int es2_cport_clear(struct gb_host_device *hd, u16 cport_id)
679 {
680 struct es2_ap_dev *es2 = hd_to_es2(hd);
681 struct device *dev = &es2->usb_dev->dev;
682 struct arpc_cport_clear_req req;
683 int ret;
684
685 req.cport_id = cpu_to_le16(cport_id);
686 ret = arpc_sync(es2, ARPC_TYPE_CPORT_CLEAR, &req, sizeof(req),
687 NULL, ES2_ARPC_CPORT_TIMEOUT);
688 if (ret) {
689 dev_err(dev, "failed to clear cport %u: %d\n", cport_id, ret);
690 return ret;
691 }
692
693 return 0;
694 }
695
696 static int latency_tag_enable(struct gb_host_device *hd, u16 cport_id)
697 {
698 int retval;
699 struct es2_ap_dev *es2 = hd_to_es2(hd);
700 struct usb_device *udev = es2->usb_dev;
701
702 retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
703 GB_APB_REQUEST_LATENCY_TAG_EN,
704 USB_DIR_OUT | USB_TYPE_VENDOR |
705 USB_RECIP_INTERFACE, cport_id, 0, NULL,
706 0, ES2_USB_CTRL_TIMEOUT);
707
708 if (retval < 0)
709 dev_err(&udev->dev, "Cannot enable latency tag for cport %d\n",
710 cport_id);
711 return retval;
712 }
713
714 static int latency_tag_disable(struct gb_host_device *hd, u16 cport_id)
715 {
716 int retval;
717 struct es2_ap_dev *es2 = hd_to_es2(hd);
718 struct usb_device *udev = es2->usb_dev;
719
720 retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
721 GB_APB_REQUEST_LATENCY_TAG_DIS,
722 USB_DIR_OUT | USB_TYPE_VENDOR |
723 USB_RECIP_INTERFACE, cport_id, 0, NULL,
724 0, ES2_USB_CTRL_TIMEOUT);
725
726 if (retval < 0)
727 dev_err(&udev->dev, "Cannot disable latency tag for cport %d\n",
728 cport_id);
729 return retval;
730 }
731
732 static struct gb_hd_driver es2_driver = {
733 .hd_priv_size = sizeof(struct es2_ap_dev),
734 .message_send = message_send,
735 .message_cancel = message_cancel,
736 .cport_allocate = es2_cport_allocate,
737 .cport_release = es2_cport_release,
738 .cport_enable = cport_enable,
739 .cport_connected = es2_cport_connected,
740 .cport_flush = es2_cport_flush,
741 .cport_shutdown = es2_cport_shutdown,
742 .cport_quiesce = es2_cport_quiesce,
743 .cport_clear = es2_cport_clear,
744 .latency_tag_enable = latency_tag_enable,
745 .latency_tag_disable = latency_tag_disable,
746 .output = output,
747 };
748
749 /* Common function to report consistent warnings based on URB status */
750 static int check_urb_status(struct urb *urb)
751 {
752 struct device *dev = &urb->dev->dev;
753 int status = urb->status;
754
755 switch (status) {
756 case 0:
757 return 0;
758
759 case -EOVERFLOW:
760 dev_err(dev, "%s: overflow actual length is %d\n",
761 __func__, urb->actual_length);
762 /* fall through */
763 case -ECONNRESET:
764 case -ENOENT:
765 case -ESHUTDOWN:
766 case -EILSEQ:
767 case -EPROTO:
768 /* device is gone, stop sending */
769 return status;
770 }
771 dev_err(dev, "%s: unknown status %d\n", __func__, status);
772
773 return -EAGAIN;
774 }
775
776 static void es2_destroy(struct es2_ap_dev *es2)
777 {
778 struct usb_device *udev;
779 struct urb *urb;
780 int i;
781
782 debugfs_remove(es2->apb_log_enable_dentry);
783 usb_log_disable(es2);
784
785 /* Tear down everything! */
786 for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
787 urb = es2->cport_out_urb[i];
788 usb_kill_urb(urb);
789 usb_free_urb(urb);
790 es2->cport_out_urb[i] = NULL;
791 es2->cport_out_urb_busy[i] = false; /* just to be anal */
792 }
793
794 for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
795 usb_free_urb(es2->arpc_urb[i]);
796 kfree(es2->arpc_buffer[i]);
797 es2->arpc_buffer[i] = NULL;
798 }
799
800 for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
801 usb_free_urb(es2->cport_in.urb[i]);
802 kfree(es2->cport_in.buffer[i]);
803 es2->cport_in.buffer[i] = NULL;
804 }
805
806 /* release reserved CDSI0 and CDSI1 cports */
807 gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI1);
808 gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI0);
809
810 udev = es2->usb_dev;
811 gb_hd_put(es2->hd);
812
813 usb_put_dev(udev);
814 }
815
816 static void cport_in_callback(struct urb *urb)
817 {
818 struct gb_host_device *hd = urb->context;
819 struct device *dev = &urb->dev->dev;
820 struct gb_operation_msg_hdr *header;
821 int status = check_urb_status(urb);
822 int retval;
823 u16 cport_id;
824
825 if (status) {
826 if ((status == -EAGAIN) || (status == -EPROTO))
827 goto exit;
828
829 /* The urb is being unlinked */
830 if (status == -ENOENT || status == -ESHUTDOWN)
831 return;
832
833 dev_err(dev, "urb cport in error %d (dropped)\n", status);
834 return;
835 }
836
837 if (urb->actual_length < sizeof(*header)) {
838 dev_err(dev, "short message received\n");
839 goto exit;
840 }
841
842 /* Extract the CPort id, which is packed in the message header */
843 header = urb->transfer_buffer;
844 cport_id = gb_message_cport_unpack(header);
845
846 if (cport_id_valid(hd, cport_id)) {
847 greybus_data_rcvd(hd, cport_id, urb->transfer_buffer,
848 urb->actual_length);
849 } else {
850 dev_err(dev, "invalid cport id %u received\n", cport_id);
851 }
852 exit:
853 /* put our urb back in the request pool */
854 retval = usb_submit_urb(urb, GFP_ATOMIC);
855 if (retval)
856 dev_err(dev, "failed to resubmit in-urb: %d\n", retval);
857 }
858
859 static void cport_out_callback(struct urb *urb)
860 {
861 struct gb_message *message = urb->context;
862 struct gb_host_device *hd = message->operation->connection->hd;
863 struct es2_ap_dev *es2 = hd_to_es2(hd);
864 int status = check_urb_status(urb);
865 unsigned long flags;
866
867 gb_message_cport_clear(message->header);
868
869 spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
870 message->hcpriv = NULL;
871 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
872
873 /*
874 * Tell the submitter that the message send (attempt) is
875 * complete, and report the status.
876 */
877 greybus_message_sent(hd, message, status);
878
879 free_urb(es2, urb);
880 }
881
882 static struct arpc *arpc_alloc(void *payload, u16 size, u8 type)
883 {
884 struct arpc *rpc;
885
886 if (size + sizeof(*rpc->req) > ARPC_OUT_SIZE_MAX)
887 return NULL;
888
889 rpc = kzalloc(sizeof(*rpc), GFP_KERNEL);
890 if (!rpc)
891 return NULL;
892
893 INIT_LIST_HEAD(&rpc->list);
894 rpc->req = kzalloc(sizeof(*rpc->req) + size, GFP_KERNEL);
895 if (!rpc->req)
896 goto err_free_rpc;
897
898 rpc->resp = kzalloc(sizeof(*rpc->resp), GFP_KERNEL);
899 if (!rpc->resp)
900 goto err_free_req;
901
902 rpc->req->type = type;
903 rpc->req->size = cpu_to_le16(sizeof(*rpc->req) + size);
904 memcpy(rpc->req->data, payload, size);
905
906 init_completion(&rpc->response_received);
907
908 return rpc;
909
910 err_free_req:
911 kfree(rpc->req);
912 err_free_rpc:
913 kfree(rpc);
914
915 return NULL;
916 }
917
918 static void arpc_free(struct arpc *rpc)
919 {
920 kfree(rpc->req);
921 kfree(rpc->resp);
922 kfree(rpc);
923 }
924
925 static struct arpc *arpc_find(struct es2_ap_dev *es2, __le16 id)
926 {
927 struct arpc *rpc;
928
929 list_for_each_entry(rpc, &es2->arpcs, list) {
930 if (rpc->req->id == id)
931 return rpc;
932 }
933
934 return NULL;
935 }
936
937 static void arpc_add(struct es2_ap_dev *es2, struct arpc *rpc)
938 {
939 rpc->active = true;
940 rpc->req->id = cpu_to_le16(es2->arpc_id_cycle++);
941 list_add_tail(&rpc->list, &es2->arpcs);
942 }
943
944 static void arpc_del(struct es2_ap_dev *es2, struct arpc *rpc)
945 {
946 if (rpc->active) {
947 rpc->active = false;
948 list_del(&rpc->list);
949 }
950 }
951
952 static int arpc_send(struct es2_ap_dev *es2, struct arpc *rpc, int timeout)
953 {
954 struct usb_device *udev = es2->usb_dev;
955 int retval;
956
957 retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
958 GB_APB_REQUEST_ARPC_RUN,
959 USB_DIR_OUT | USB_TYPE_VENDOR |
960 USB_RECIP_INTERFACE,
961 0, 0,
962 rpc->req, le16_to_cpu(rpc->req->size),
963 ES2_USB_CTRL_TIMEOUT);
964 if (retval != le16_to_cpu(rpc->req->size)) {
965 dev_err(&udev->dev,
966 "failed to send ARPC request %d: %d\n",
967 rpc->req->type, retval);
968 if (retval > 0)
969 retval = -EIO;
970 return retval;
971 }
972
973 return 0;
974 }
975
976 static int arpc_sync(struct es2_ap_dev *es2, u8 type, void *payload,
977 size_t size, int *result, unsigned int timeout)
978 {
979 struct arpc *rpc;
980 unsigned long flags;
981 int retval;
982
983 if (result)
984 *result = 0;
985
986 rpc = arpc_alloc(payload, size, type);
987 if (!rpc)
988 return -ENOMEM;
989
990 spin_lock_irqsave(&es2->arpc_lock, flags);
991 arpc_add(es2, rpc);
992 spin_unlock_irqrestore(&es2->arpc_lock, flags);
993
994 retval = arpc_send(es2, rpc, timeout);
995 if (retval)
996 goto out_arpc_del;
997
998 retval = wait_for_completion_interruptible_timeout(
999 &rpc->response_received,
1000 msecs_to_jiffies(timeout));
1001 if (retval <= 0) {
1002 if (!retval)
1003 retval = -ETIMEDOUT;
1004 goto out_arpc_del;
1005 }
1006
1007 if (rpc->resp->result) {
1008 retval = -EREMOTEIO;
1009 if (result)
1010 *result = rpc->resp->result;
1011 } else {
1012 retval = 0;
1013 }
1014
1015 out_arpc_del:
1016 spin_lock_irqsave(&es2->arpc_lock, flags);
1017 arpc_del(es2, rpc);
1018 spin_unlock_irqrestore(&es2->arpc_lock, flags);
1019 arpc_free(rpc);
1020
1021 if (retval < 0 && retval != -EREMOTEIO) {
1022 dev_err(&es2->usb_dev->dev,
1023 "failed to execute ARPC: %d\n", retval);
1024 }
1025
1026 return retval;
1027 }
1028
1029 static void arpc_in_callback(struct urb *urb)
1030 {
1031 struct es2_ap_dev *es2 = urb->context;
1032 struct device *dev = &urb->dev->dev;
1033 int status = check_urb_status(urb);
1034 struct arpc *rpc;
1035 struct arpc_response_message *resp;
1036 unsigned long flags;
1037 int retval;
1038
1039 if (status) {
1040 if ((status == -EAGAIN) || (status == -EPROTO))
1041 goto exit;
1042
1043 /* The urb is being unlinked */
1044 if (status == -ENOENT || status == -ESHUTDOWN)
1045 return;
1046
1047 dev_err(dev, "arpc in-urb error %d (dropped)\n", status);
1048 return;
1049 }
1050
1051 if (urb->actual_length < sizeof(*resp)) {
1052 dev_err(dev, "short aprc response received\n");
1053 goto exit;
1054 }
1055
1056 resp = urb->transfer_buffer;
1057 spin_lock_irqsave(&es2->arpc_lock, flags);
1058 rpc = arpc_find(es2, resp->id);
1059 if (!rpc) {
1060 dev_err(dev, "invalid arpc response id received: %u\n",
1061 le16_to_cpu(resp->id));
1062 spin_unlock_irqrestore(&es2->arpc_lock, flags);
1063 goto exit;
1064 }
1065
1066 arpc_del(es2, rpc);
1067 memcpy(rpc->resp, resp, sizeof(*resp));
1068 complete(&rpc->response_received);
1069 spin_unlock_irqrestore(&es2->arpc_lock, flags);
1070
1071 exit:
1072 /* put our urb back in the request pool */
1073 retval = usb_submit_urb(urb, GFP_ATOMIC);
1074 if (retval)
1075 dev_err(dev, "failed to resubmit arpc in-urb: %d\n", retval);
1076 }
1077
1078 #define APB1_LOG_MSG_SIZE 64
1079 static void apb_log_get(struct es2_ap_dev *es2, char *buf)
1080 {
1081 int retval;
1082
1083 do {
1084 retval = usb_control_msg(es2->usb_dev,
1085 usb_rcvctrlpipe(es2->usb_dev, 0),
1086 GB_APB_REQUEST_LOG,
1087 USB_DIR_IN | USB_TYPE_VENDOR |
1088 USB_RECIP_INTERFACE,
1089 0x00, 0x00,
1090 buf,
1091 APB1_LOG_MSG_SIZE,
1092 ES2_USB_CTRL_TIMEOUT);
1093 if (retval > 0)
1094 kfifo_in(&es2->apb_log_fifo, buf, retval);
1095 } while (retval > 0);
1096 }
1097
1098 static int apb_log_poll(void *data)
1099 {
1100 struct es2_ap_dev *es2 = data;
1101 char *buf;
1102
1103 buf = kmalloc(APB1_LOG_MSG_SIZE, GFP_KERNEL);
1104 if (!buf)
1105 return -ENOMEM;
1106
1107 while (!kthread_should_stop()) {
1108 msleep(1000);
1109 apb_log_get(es2, buf);
1110 }
1111
1112 kfree(buf);
1113
1114 return 0;
1115 }
1116
1117 static ssize_t apb_log_read(struct file *f, char __user *buf,
1118 size_t count, loff_t *ppos)
1119 {
1120 struct es2_ap_dev *es2 = file_inode(f)->i_private;
1121 ssize_t ret;
1122 size_t copied;
1123 char *tmp_buf;
1124
1125 if (count > APB1_LOG_SIZE)
1126 count = APB1_LOG_SIZE;
1127
1128 tmp_buf = kmalloc(count, GFP_KERNEL);
1129 if (!tmp_buf)
1130 return -ENOMEM;
1131
1132 copied = kfifo_out(&es2->apb_log_fifo, tmp_buf, count);
1133 ret = simple_read_from_buffer(buf, count, ppos, tmp_buf, copied);
1134
1135 kfree(tmp_buf);
1136
1137 return ret;
1138 }
1139
1140 static const struct file_operations apb_log_fops = {
1141 .read = apb_log_read,
1142 };
1143
1144 static void usb_log_enable(struct es2_ap_dev *es2)
1145 {
1146 if (!IS_ERR_OR_NULL(es2->apb_log_task))
1147 return;
1148
1149 /* get log from APB1 */
1150 es2->apb_log_task = kthread_run(apb_log_poll, es2, "apb_log");
1151 if (IS_ERR(es2->apb_log_task))
1152 return;
1153 /* XXX We will need to rename this per APB */
1154 es2->apb_log_dentry = debugfs_create_file("apb_log", 0444,
1155 gb_debugfs_get(), es2,
1156 &apb_log_fops);
1157 }
1158
1159 static void usb_log_disable(struct es2_ap_dev *es2)
1160 {
1161 if (IS_ERR_OR_NULL(es2->apb_log_task))
1162 return;
1163
1164 debugfs_remove(es2->apb_log_dentry);
1165 es2->apb_log_dentry = NULL;
1166
1167 kthread_stop(es2->apb_log_task);
1168 es2->apb_log_task = NULL;
1169 }
1170
1171 static ssize_t apb_log_enable_read(struct file *f, char __user *buf,
1172 size_t count, loff_t *ppos)
1173 {
1174 struct es2_ap_dev *es2 = file_inode(f)->i_private;
1175 int enable = !IS_ERR_OR_NULL(es2->apb_log_task);
1176 char tmp_buf[3];
1177
1178 sprintf(tmp_buf, "%d\n", enable);
1179 return simple_read_from_buffer(buf, count, ppos, tmp_buf, 3);
1180 }
1181
1182 static ssize_t apb_log_enable_write(struct file *f, const char __user *buf,
1183 size_t count, loff_t *ppos)
1184 {
1185 int enable;
1186 ssize_t retval;
1187 struct es2_ap_dev *es2 = file_inode(f)->i_private;
1188
1189 retval = kstrtoint_from_user(buf, count, 10, &enable);
1190 if (retval)
1191 return retval;
1192
1193 if (enable)
1194 usb_log_enable(es2);
1195 else
1196 usb_log_disable(es2);
1197
1198 return count;
1199 }
1200
1201 static const struct file_operations apb_log_enable_fops = {
1202 .read = apb_log_enable_read,
1203 .write = apb_log_enable_write,
1204 };
1205
1206 static int apb_get_cport_count(struct usb_device *udev)
1207 {
1208 int retval;
1209 __le16 *cport_count;
1210
1211 cport_count = kzalloc(sizeof(*cport_count), GFP_KERNEL);
1212 if (!cport_count)
1213 return -ENOMEM;
1214
1215 retval = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
1216 GB_APB_REQUEST_CPORT_COUNT,
1217 USB_DIR_IN | USB_TYPE_VENDOR |
1218 USB_RECIP_INTERFACE, 0, 0, cport_count,
1219 sizeof(*cport_count), ES2_USB_CTRL_TIMEOUT);
1220 if (retval != sizeof(*cport_count)) {
1221 dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n",
1222 retval);
1223
1224 if (retval >= 0)
1225 retval = -EIO;
1226
1227 goto out;
1228 }
1229
1230 retval = le16_to_cpu(*cport_count);
1231
1232 /* We need to fit a CPort ID in one byte of a message header */
1233 if (retval > U8_MAX) {
1234 retval = U8_MAX;
1235 dev_warn(&udev->dev, "Limiting number of CPorts to U8_MAX\n");
1236 }
1237
1238 out:
1239 kfree(cport_count);
1240 return retval;
1241 }
1242
1243 /*
1244 * The ES2 USB Bridge device has 15 endpoints
1245 * 1 Control - usual USB stuff + AP -> APBridgeA messages
1246 * 7 Bulk IN - CPort data in
1247 * 7 Bulk OUT - CPort data out
1248 */
1249 static int ap_probe(struct usb_interface *interface,
1250 const struct usb_device_id *id)
1251 {
1252 struct es2_ap_dev *es2;
1253 struct gb_host_device *hd;
1254 struct usb_device *udev;
1255 struct usb_host_interface *iface_desc;
1256 struct usb_endpoint_descriptor *endpoint;
1257 __u8 ep_addr;
1258 int retval;
1259 int i;
1260 int num_cports;
1261 bool bulk_out_found = false;
1262 bool bulk_in_found = false;
1263 bool arpc_in_found = false;
1264
1265 udev = usb_get_dev(interface_to_usbdev(interface));
1266
1267 num_cports = apb_get_cport_count(udev);
1268 if (num_cports < 0) {
1269 usb_put_dev(udev);
1270 dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n",
1271 num_cports);
1272 return num_cports;
1273 }
1274
1275 hd = gb_hd_create(&es2_driver, &udev->dev, ES2_GBUF_MSG_SIZE_MAX,
1276 num_cports);
1277 if (IS_ERR(hd)) {
1278 usb_put_dev(udev);
1279 return PTR_ERR(hd);
1280 }
1281
1282 es2 = hd_to_es2(hd);
1283 es2->hd = hd;
1284 es2->usb_intf = interface;
1285 es2->usb_dev = udev;
1286 spin_lock_init(&es2->cport_out_urb_lock);
1287 INIT_KFIFO(es2->apb_log_fifo);
1288 usb_set_intfdata(interface, es2);
1289
1290 /*
1291 * Reserve the CDSI0 and CDSI1 CPorts so they won't be allocated
1292 * dynamically.
1293 */
1294 retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI0);
1295 if (retval)
1296 goto error;
1297 retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI1);
1298 if (retval)
1299 goto error;
1300
1301 /* find all bulk endpoints */
1302 iface_desc = interface->cur_altsetting;
1303 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1304 endpoint = &iface_desc->endpoint[i].desc;
1305 ep_addr = endpoint->bEndpointAddress;
1306
1307 if (usb_endpoint_is_bulk_in(endpoint)) {
1308 if (!bulk_in_found) {
1309 es2->cport_in.endpoint = ep_addr;
1310 bulk_in_found = true;
1311 } else if (!arpc_in_found) {
1312 es2->arpc_endpoint_in = ep_addr;
1313 arpc_in_found = true;
1314 } else {
1315 dev_warn(&udev->dev,
1316 "Unused bulk IN endpoint found: 0x%02x\n",
1317 ep_addr);
1318 }
1319 continue;
1320 }
1321 if (usb_endpoint_is_bulk_out(endpoint)) {
1322 if (!bulk_out_found) {
1323 es2->cport_out_endpoint = ep_addr;
1324 bulk_out_found = true;
1325 } else {
1326 dev_warn(&udev->dev,
1327 "Unused bulk OUT endpoint found: 0x%02x\n",
1328 ep_addr);
1329 }
1330 continue;
1331 }
1332 dev_warn(&udev->dev,
1333 "Unknown endpoint type found, address 0x%02x\n",
1334 ep_addr);
1335 }
1336 if (!bulk_in_found || !arpc_in_found || !bulk_out_found) {
1337 dev_err(&udev->dev, "Not enough endpoints found in device, aborting!\n");
1338 retval = -ENODEV;
1339 goto error;
1340 }
1341
1342 /* Allocate buffers for our cport in messages */
1343 for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
1344 struct urb *urb;
1345 u8 *buffer;
1346
1347 urb = usb_alloc_urb(0, GFP_KERNEL);
1348 if (!urb) {
1349 retval = -ENOMEM;
1350 goto error;
1351 }
1352 es2->cport_in.urb[i] = urb;
1353
1354 buffer = kmalloc(ES2_GBUF_MSG_SIZE_MAX, GFP_KERNEL);
1355 if (!buffer) {
1356 retval = -ENOMEM;
1357 goto error;
1358 }
1359
1360 usb_fill_bulk_urb(urb, udev,
1361 usb_rcvbulkpipe(udev, es2->cport_in.endpoint),
1362 buffer, ES2_GBUF_MSG_SIZE_MAX,
1363 cport_in_callback, hd);
1364
1365 es2->cport_in.buffer[i] = buffer;
1366 }
1367
1368 /* Allocate buffers for ARPC in messages */
1369 for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
1370 struct urb *urb;
1371 u8 *buffer;
1372
1373 urb = usb_alloc_urb(0, GFP_KERNEL);
1374 if (!urb) {
1375 retval = -ENOMEM;
1376 goto error;
1377 }
1378 es2->arpc_urb[i] = urb;
1379
1380 buffer = kmalloc(ARPC_IN_SIZE_MAX, GFP_KERNEL);
1381 if (!buffer) {
1382 retval = -ENOMEM;
1383 goto error;
1384 }
1385
1386 usb_fill_bulk_urb(urb, udev,
1387 usb_rcvbulkpipe(udev,
1388 es2->arpc_endpoint_in),
1389 buffer, ARPC_IN_SIZE_MAX,
1390 arpc_in_callback, es2);
1391
1392 es2->arpc_buffer[i] = buffer;
1393 }
1394
1395 /* Allocate urbs for our CPort OUT messages */
1396 for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
1397 struct urb *urb;
1398
1399 urb = usb_alloc_urb(0, GFP_KERNEL);
1400 if (!urb) {
1401 retval = -ENOMEM;
1402 goto error;
1403 }
1404
1405 es2->cport_out_urb[i] = urb;
1406 es2->cport_out_urb_busy[i] = false; /* just to be anal */
1407 }
1408
1409 /* XXX We will need to rename this per APB */
1410 es2->apb_log_enable_dentry = debugfs_create_file("apb_log_enable",
1411 0644,
1412 gb_debugfs_get(), es2,
1413 &apb_log_enable_fops);
1414
1415 INIT_LIST_HEAD(&es2->arpcs);
1416 spin_lock_init(&es2->arpc_lock);
1417
1418 retval = es2_arpc_in_enable(es2);
1419 if (retval)
1420 goto error;
1421
1422 retval = gb_hd_add(hd);
1423 if (retval)
1424 goto err_disable_arpc_in;
1425
1426 retval = es2_cport_in_enable(es2, &es2->cport_in);
1427 if (retval)
1428 goto err_hd_del;
1429
1430 return 0;
1431
1432 err_hd_del:
1433 gb_hd_del(hd);
1434 err_disable_arpc_in:
1435 es2_arpc_in_disable(es2);
1436 error:
1437 es2_destroy(es2);
1438
1439 return retval;
1440 }
1441
1442 static void ap_disconnect(struct usb_interface *interface)
1443 {
1444 struct es2_ap_dev *es2 = usb_get_intfdata(interface);
1445
1446 gb_hd_del(es2->hd);
1447
1448 es2_cport_in_disable(es2, &es2->cport_in);
1449 es2_arpc_in_disable(es2);
1450
1451 es2_destroy(es2);
1452 }
1453
1454 static struct usb_driver es2_ap_driver = {
1455 .name = "es2_ap_driver",
1456 .probe = ap_probe,
1457 .disconnect = ap_disconnect,
1458 .id_table = id_table,
1459 .soft_unbind = 1,
1460 };
1461
1462 module_usb_driver(es2_ap_driver);
1463
1464 MODULE_LICENSE("GPL v2");
1465 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
Linux with added FPC-III support