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xtensa: support DMA buffers in high memory
[cris-mirror.git] / drivers / staging / greybus / es2.c
blobb082d81833a0a2da98dd3e233b489db6e315440d
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 <asm/unaligned.h>
15
16 #include "arpc.h"
17 #include "greybus.h"
18 #include "greybus_trace.h"
19 #include "connection.h"
20
21
22 /* Default timeout for USB vendor requests. */
23 #define ES2_USB_CTRL_TIMEOUT 500
24
25 /* Default timeout for ARPC CPort requests */
26 #define ES2_ARPC_CPORT_TIMEOUT 500
27
28 /* Fixed CPort numbers */
29 #define ES2_CPORT_CDSI0 16
30 #define ES2_CPORT_CDSI1 17
31
32 /* Memory sizes for the buffers sent to/from the ES2 controller */
33 #define ES2_GBUF_MSG_SIZE_MAX 2048
34
35 /* Memory sizes for the ARPC buffers */
36 #define ARPC_OUT_SIZE_MAX U16_MAX
37 #define ARPC_IN_SIZE_MAX 128
38
39 static const struct usb_device_id id_table[] = {
40 { USB_DEVICE(0x18d1, 0x1eaf) },
41 { },
42 };
43 MODULE_DEVICE_TABLE(usb, id_table);
44
45 #define APB1_LOG_SIZE SZ_16K
46
47 /*
48 * Number of CPort IN urbs in flight at any point in time.
49 * Adjust if we are having stalls in the USB buffer due to not enough urbs in
50 * flight.
51 */
52 #define NUM_CPORT_IN_URB 4
53
54 /* Number of CPort OUT urbs in flight at any point in time.
55 * Adjust if we get messages saying we are out of urbs in the system log.
56 */
57 #define NUM_CPORT_OUT_URB 8
58
59 /*
60 * Number of ARPC in urbs in flight at any point in time.
61 */
62 #define NUM_ARPC_IN_URB 2
63
64 /*
65 * @endpoint: bulk in endpoint for CPort data
66 * @urb: array of urbs for the CPort in messages
67 * @buffer: array of buffers for the @cport_in_urb urbs
68 */
69 struct es2_cport_in {
70 __u8 endpoint;
71 struct urb *urb[NUM_CPORT_IN_URB];
72 u8 *buffer[NUM_CPORT_IN_URB];
73 };
74
75 /**
76 * es2_ap_dev - ES2 USB Bridge to AP structure
77 * @usb_dev: pointer to the USB device we are.
78 * @usb_intf: pointer to the USB interface we are bound to.
79 * @hd: pointer to our gb_host_device structure
80
81 * @cport_in: endpoint, urbs and buffer for cport in messages
82 * @cport_out_endpoint: endpoint for for cport out messages
83 * @cport_out_urb: array of urbs for the CPort out messages
84 * @cport_out_urb_busy: array of flags to see if the @cport_out_urb is busy or
85 * not.
86 * @cport_out_urb_cancelled: array of flags indicating whether the
87 * corresponding @cport_out_urb is being cancelled
88 * @cport_out_urb_lock: locks the @cport_out_urb_busy "list"
89 *
90 * @apb_log_task: task pointer for logging thread
91 * @apb_log_dentry: file system entry for the log file interface
92 * @apb_log_enable_dentry: file system entry for enabling logging
93 * @apb_log_fifo: kernel FIFO to carry logged data
94 * @arpc_urb: array of urbs for the ARPC in messages
95 * @arpc_buffer: array of buffers for the @arpc_urb urbs
96 * @arpc_endpoint_in: bulk in endpoint for APBridgeA RPC
97 * @arpc_id_cycle: gives an unique id to ARPC
98 * @arpc_lock: locks ARPC list
99 * @arpcs: list of in progress ARPCs
100 */
101 struct es2_ap_dev {
102 struct usb_device *usb_dev;
103 struct usb_interface *usb_intf;
104 struct gb_host_device *hd;
105
106 struct es2_cport_in cport_in;
107 __u8 cport_out_endpoint;
108 struct urb *cport_out_urb[NUM_CPORT_OUT_URB];
109 bool cport_out_urb_busy[NUM_CPORT_OUT_URB];
110 bool cport_out_urb_cancelled[NUM_CPORT_OUT_URB];
111 spinlock_t cport_out_urb_lock;
112
113 bool cdsi1_in_use;
114
115 struct task_struct *apb_log_task;
116 struct dentry *apb_log_dentry;
117 struct dentry *apb_log_enable_dentry;
118 DECLARE_KFIFO(apb_log_fifo, char, APB1_LOG_SIZE);
119
120 __u8 arpc_endpoint_in;
121 struct urb *arpc_urb[NUM_ARPC_IN_URB];
122 u8 *arpc_buffer[NUM_ARPC_IN_URB];
123
124 int arpc_id_cycle;
125 spinlock_t arpc_lock;
126 struct list_head arpcs;
127 };
128
129 struct arpc {
130 struct list_head list;
131 struct arpc_request_message *req;
132 struct arpc_response_message *resp;
133 struct completion response_received;
134 bool active;
135 };
136
137 static inline struct es2_ap_dev *hd_to_es2(struct gb_host_device *hd)
138 {
139 return (struct es2_ap_dev *)&hd->hd_priv;
140 }
141
142 static void cport_out_callback(struct urb *urb);
143 static void usb_log_enable(struct es2_ap_dev *es2);
144 static void usb_log_disable(struct es2_ap_dev *es2);
145 static int arpc_sync(struct es2_ap_dev *es2, u8 type, void *payload,
146 size_t size, int *result, unsigned int timeout);
147
148 static int output_sync(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd)
149 {
150 struct usb_device *udev = es2->usb_dev;
151 u8 *data;
152 int retval;
153
154 data = kmemdup(req, size, GFP_KERNEL);
155 if (!data)
156 return -ENOMEM;
157
158 retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
159 cmd,
160 USB_DIR_OUT | USB_TYPE_VENDOR |
161 USB_RECIP_INTERFACE,
162 0, 0, data, size, ES2_USB_CTRL_TIMEOUT);
163 if (retval < 0)
164 dev_err(&udev->dev, "%s: return error %d\n", __func__, retval);
165 else
166 retval = 0;
167
168 kfree(data);
169 return retval;
170 }
171
172 static void ap_urb_complete(struct urb *urb)
173 {
174 struct usb_ctrlrequest *dr = urb->context;
175
176 kfree(dr);
177 usb_free_urb(urb);
178 }
179
180 static int output_async(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd)
181 {
182 struct usb_device *udev = es2->usb_dev;
183 struct urb *urb;
184 struct usb_ctrlrequest *dr;
185 u8 *buf;
186 int retval;
187
188 urb = usb_alloc_urb(0, GFP_ATOMIC);
189 if (!urb)
190 return -ENOMEM;
191
192 dr = kmalloc(sizeof(*dr) + size, GFP_ATOMIC);
193 if (!dr) {
194 usb_free_urb(urb);
195 return -ENOMEM;
196 }
197
198 buf = (u8 *)dr + sizeof(*dr);
199 memcpy(buf, req, size);
200
201 dr->bRequest = cmd;
202 dr->bRequestType = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE;
203 dr->wValue = 0;
204 dr->wIndex = 0;
205 dr->wLength = cpu_to_le16(size);
206
207 usb_fill_control_urb(urb, udev, usb_sndctrlpipe(udev, 0),
208 (unsigned char *)dr, buf, size,
209 ap_urb_complete, dr);
210 retval = usb_submit_urb(urb, GFP_ATOMIC);
211 if (retval) {
212 usb_free_urb(urb);
213 kfree(dr);
214 }
215 return retval;
216 }
217
218 static int output(struct gb_host_device *hd, void *req, u16 size, u8 cmd,
219 bool async)
220 {
221 struct es2_ap_dev *es2 = hd_to_es2(hd);
222
223 if (async)
224 return output_async(es2, req, size, cmd);
225
226 return output_sync(es2, req, size, cmd);
227 }
228
229 static int es2_cport_in_enable(struct es2_ap_dev *es2,
230 struct es2_cport_in *cport_in)
231 {
232 struct urb *urb;
233 int ret;
234 int i;
235
236 for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
237 urb = cport_in->urb[i];
238
239 ret = usb_submit_urb(urb, GFP_KERNEL);
240 if (ret) {
241 dev_err(&es2->usb_dev->dev,
242 "failed to submit in-urb: %d\n", ret);
243 goto err_kill_urbs;
244 }
245 }
246
247 return 0;
248
249 err_kill_urbs:
250 for (--i; i >= 0; --i) {
251 urb = cport_in->urb[i];
252 usb_kill_urb(urb);
253 }
254
255 return ret;
256 }
257
258 static void es2_cport_in_disable(struct es2_ap_dev *es2,
259 struct es2_cport_in *cport_in)
260 {
261 struct urb *urb;
262 int i;
263
264 for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
265 urb = cport_in->urb[i];
266 usb_kill_urb(urb);
267 }
268 }
269
270 static int es2_arpc_in_enable(struct es2_ap_dev *es2)
271 {
272 struct urb *urb;
273 int ret;
274 int i;
275
276 for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
277 urb = es2->arpc_urb[i];
278
279 ret = usb_submit_urb(urb, GFP_KERNEL);
280 if (ret) {
281 dev_err(&es2->usb_dev->dev,
282 "failed to submit arpc in-urb: %d\n", ret);
283 goto err_kill_urbs;
284 }
285 }
286
287 return 0;
288
289 err_kill_urbs:
290 for (--i; i >= 0; --i) {
291 urb = es2->arpc_urb[i];
292 usb_kill_urb(urb);
293 }
294
295 return ret;
296 }
297
298 static void es2_arpc_in_disable(struct es2_ap_dev *es2)
299 {
300 struct urb *urb;
301 int i;
302
303 for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
304 urb = es2->arpc_urb[i];
305 usb_kill_urb(urb);
306 }
307 }
308
309 static struct urb *next_free_urb(struct es2_ap_dev *es2, gfp_t gfp_mask)
310 {
311 struct urb *urb = NULL;
312 unsigned long flags;
313 int i;
314
315 spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
316
317 /* Look in our pool of allocated urbs first, as that's the "fastest" */
318 for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
319 if (es2->cport_out_urb_busy[i] == false &&
320 es2->cport_out_urb_cancelled[i] == false) {
321 es2->cport_out_urb_busy[i] = true;
322 urb = es2->cport_out_urb[i];
323 break;
324 }
325 }
326 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
327 if (urb)
328 return urb;
329
330 /*
331 * Crap, pool is empty, complain to the syslog and go allocate one
332 * dynamically as we have to succeed.
333 */
334 dev_dbg(&es2->usb_dev->dev,
335 "No free CPort OUT urbs, having to dynamically allocate one!\n");
336 return usb_alloc_urb(0, gfp_mask);
337 }
338
339 static void free_urb(struct es2_ap_dev *es2, struct urb *urb)
340 {
341 unsigned long flags;
342 int i;
343 /*
344 * See if this was an urb in our pool, if so mark it "free", otherwise
345 * we need to free it ourselves.
346 */
347 spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
348 for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
349 if (urb == es2->cport_out_urb[i]) {
350 es2->cport_out_urb_busy[i] = false;
351 urb = NULL;
352 break;
353 }
354 }
355 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
356
357 /* If urb is not NULL, then we need to free this urb */
358 usb_free_urb(urb);
359 }
360
361 /*
362 * We (ab)use the operation-message header pad bytes to transfer the
363 * cport id in order to minimise overhead.
364 */
365 static void
366 gb_message_cport_pack(struct gb_operation_msg_hdr *header, u16 cport_id)
367 {
368 header->pad[0] = cport_id;
369 }
370
371 /* Clear the pad bytes used for the CPort id */
372 static void gb_message_cport_clear(struct gb_operation_msg_hdr *header)
373 {
374 header->pad[0] = 0;
375 }
376
377 /* Extract the CPort id packed into the header, and clear it */
378 static u16 gb_message_cport_unpack(struct gb_operation_msg_hdr *header)
379 {
380 u16 cport_id = header->pad[0];
381
382 gb_message_cport_clear(header);
383
384 return cport_id;
385 }
386
387 /*
388 * Returns zero if the message was successfully queued, or a negative errno
389 * otherwise.
390 */
391 static int message_send(struct gb_host_device *hd, u16 cport_id,
392 struct gb_message *message, gfp_t gfp_mask)
393 {
394 struct es2_ap_dev *es2 = hd_to_es2(hd);
395 struct usb_device *udev = es2->usb_dev;
396 size_t buffer_size;
397 int retval;
398 struct urb *urb;
399 unsigned long flags;
400
401 /*
402 * The data actually transferred will include an indication
403 * of where the data should be sent. Do one last check of
404 * the target CPort id before filling it in.
405 */
406 if (!cport_id_valid(hd, cport_id)) {
407 dev_err(&udev->dev, "invalid cport %u\n", cport_id);
408 return -EINVAL;
409 }
410
411 /* Find a free urb */
412 urb = next_free_urb(es2, gfp_mask);
413 if (!urb)
414 return -ENOMEM;
415
416 spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
417 message->hcpriv = urb;
418 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
419
420 /* Pack the cport id into the message header */
421 gb_message_cport_pack(message->header, cport_id);
422
423 buffer_size = sizeof(*message->header) + message->payload_size;
424
425 usb_fill_bulk_urb(urb, udev,
426 usb_sndbulkpipe(udev,
427 es2->cport_out_endpoint),
428 message->buffer, buffer_size,
429 cport_out_callback, message);
430 urb->transfer_flags |= URB_ZERO_PACKET;
431
432 trace_gb_message_submit(message);
433
434 retval = usb_submit_urb(urb, gfp_mask);
435 if (retval) {
436 dev_err(&udev->dev, "failed to submit out-urb: %d\n", retval);
437
438 spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
439 message->hcpriv = NULL;
440 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
441
442 free_urb(es2, urb);
443 gb_message_cport_clear(message->header);
444
445 return retval;
446 }
447
448 return 0;
449 }
450
451 /*
452 * Can not be called in atomic context.
453 */
454 static void message_cancel(struct gb_message *message)
455 {
456 struct gb_host_device *hd = message->operation->connection->hd;
457 struct es2_ap_dev *es2 = hd_to_es2(hd);
458 struct urb *urb;
459 int i;
460
461 might_sleep();
462
463 spin_lock_irq(&es2->cport_out_urb_lock);
464 urb = message->hcpriv;
465
466 /* Prevent dynamically allocated urb from being deallocated. */
467 usb_get_urb(urb);
468
469 /* Prevent pre-allocated urb from being reused. */
470 for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
471 if (urb == es2->cport_out_urb[i]) {
472 es2->cport_out_urb_cancelled[i] = true;
473 break;
474 }
475 }
476 spin_unlock_irq(&es2->cport_out_urb_lock);
477
478 usb_kill_urb(urb);
479
480 if (i < NUM_CPORT_OUT_URB) {
481 spin_lock_irq(&es2->cport_out_urb_lock);
482 es2->cport_out_urb_cancelled[i] = false;
483 spin_unlock_irq(&es2->cport_out_urb_lock);
484 }
485
486 usb_free_urb(urb);
487 }
488
489 static int es2_cport_allocate(struct gb_host_device *hd, int cport_id,
490 unsigned long flags)
491 {
492 struct es2_ap_dev *es2 = hd_to_es2(hd);
493 struct ida *id_map = &hd->cport_id_map;
494 int ida_start, ida_end;
495
496 switch (cport_id) {
497 case ES2_CPORT_CDSI0:
498 case ES2_CPORT_CDSI1:
499 dev_err(&hd->dev, "cport %d not available\n", cport_id);
500 return -EBUSY;
501 }
502
503 if (flags & GB_CONNECTION_FLAG_OFFLOADED &&
504 flags & GB_CONNECTION_FLAG_CDSI1) {
505 if (es2->cdsi1_in_use) {
506 dev_err(&hd->dev, "CDSI1 already in use\n");
507 return -EBUSY;
508 }
509
510 es2->cdsi1_in_use = true;
511
512 return ES2_CPORT_CDSI1;
513 }
514
515 if (cport_id < 0) {
516 ida_start = 0;
517 ida_end = hd->num_cports;
518 } else if (cport_id < hd->num_cports) {
519 ida_start = cport_id;
520 ida_end = cport_id + 1;
521 } else {
522 dev_err(&hd->dev, "cport %d not available\n", cport_id);
523 return -EINVAL;
524 }
525
526 return ida_simple_get(id_map, ida_start, ida_end, GFP_KERNEL);
527 }
528
529 static void es2_cport_release(struct gb_host_device *hd, u16 cport_id)
530 {
531 struct es2_ap_dev *es2 = hd_to_es2(hd);
532
533 switch (cport_id) {
534 case ES2_CPORT_CDSI1:
535 es2->cdsi1_in_use = false;
536 return;
537 }
538
539 ida_simple_remove(&hd->cport_id_map, cport_id);
540 }
541
542 static int cport_enable(struct gb_host_device *hd, u16 cport_id,
543 unsigned long flags)
544 {
545 struct es2_ap_dev *es2 = hd_to_es2(hd);
546 struct usb_device *udev = es2->usb_dev;
547 struct gb_apb_request_cport_flags *req;
548 u32 connection_flags;
549 int ret;
550
551 req = kzalloc(sizeof(*req), GFP_KERNEL);
552 if (!req)
553 return -ENOMEM;
554
555 connection_flags = 0;
556 if (flags & GB_CONNECTION_FLAG_CONTROL)
557 connection_flags |= GB_APB_CPORT_FLAG_CONTROL;
558 if (flags & GB_CONNECTION_FLAG_HIGH_PRIO)
559 connection_flags |= GB_APB_CPORT_FLAG_HIGH_PRIO;
560
561 req->flags = cpu_to_le32(connection_flags);
562
563 dev_dbg(&hd->dev, "%s - cport = %u, flags = %02x\n", __func__,
564 cport_id, connection_flags);
565
566 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
567 GB_APB_REQUEST_CPORT_FLAGS,
568 USB_DIR_OUT | USB_TYPE_VENDOR |
569 USB_RECIP_INTERFACE, cport_id, 0,
570 req, sizeof(*req), ES2_USB_CTRL_TIMEOUT);
571 if (ret != sizeof(*req)) {
572 dev_err(&udev->dev, "failed to set cport flags for port %d\n",
573 cport_id);
574 if (ret >= 0)
575 ret = -EIO;
576
577 goto out;
578 }
579
580 ret = 0;
581 out:
582 kfree(req);
583
584 return ret;
585 }
586
587 static int es2_cport_connected(struct gb_host_device *hd, u16 cport_id)
588 {
589 struct es2_ap_dev *es2 = hd_to_es2(hd);
590 struct device *dev = &es2->usb_dev->dev;
591 struct arpc_cport_connected_req req;
592 int ret;
593
594 req.cport_id = cpu_to_le16(cport_id);
595 ret = arpc_sync(es2, ARPC_TYPE_CPORT_CONNECTED, &req, sizeof(req),
596 NULL, ES2_ARPC_CPORT_TIMEOUT);
597 if (ret) {
598 dev_err(dev, "failed to set connected state for cport %u: %d\n",
599 cport_id, ret);
600 return ret;
601 }
602
603 return 0;
604 }
605
606 static int es2_cport_flush(struct gb_host_device *hd, u16 cport_id)
607 {
608 struct es2_ap_dev *es2 = hd_to_es2(hd);
609 struct device *dev = &es2->usb_dev->dev;
610 struct arpc_cport_flush_req req;
611 int ret;
612
613 req.cport_id = cpu_to_le16(cport_id);
614 ret = arpc_sync(es2, ARPC_TYPE_CPORT_FLUSH, &req, sizeof(req),
615 NULL, ES2_ARPC_CPORT_TIMEOUT);
616 if (ret) {
617 dev_err(dev, "failed to flush cport %u: %d\n", cport_id, ret);
618 return ret;
619 }
620
621 return 0;
622 }
623
624 static int es2_cport_shutdown(struct gb_host_device *hd, u16 cport_id,
625 u8 phase, unsigned int timeout)
626 {
627 struct es2_ap_dev *es2 = hd_to_es2(hd);
628 struct device *dev = &es2->usb_dev->dev;
629 struct arpc_cport_shutdown_req req;
630 int result;
631 int ret;
632
633 if (timeout > U16_MAX)
634 return -EINVAL;
635
636 req.cport_id = cpu_to_le16(cport_id);
637 req.timeout = cpu_to_le16(timeout);
638 req.phase = phase;
639 ret = arpc_sync(es2, ARPC_TYPE_CPORT_SHUTDOWN, &req, sizeof(req),
640 &result, ES2_ARPC_CPORT_TIMEOUT + timeout);
641 if (ret) {
642 dev_err(dev, "failed to send shutdown over cport %u: %d (%d)\n",
643 cport_id, ret, result);
644 return ret;
645 }
646
647 return 0;
648 }
649
650 static int es2_cport_quiesce(struct gb_host_device *hd, u16 cport_id,
651 size_t peer_space, unsigned int timeout)
652 {
653 struct es2_ap_dev *es2 = hd_to_es2(hd);
654 struct device *dev = &es2->usb_dev->dev;
655 struct arpc_cport_quiesce_req req;
656 int result;
657 int ret;
658
659 if (peer_space > U16_MAX)
660 return -EINVAL;
661
662 if (timeout > U16_MAX)
663 return -EINVAL;
664
665 req.cport_id = cpu_to_le16(cport_id);
666 req.peer_space = cpu_to_le16(peer_space);
667 req.timeout = cpu_to_le16(timeout);
668 ret = arpc_sync(es2, ARPC_TYPE_CPORT_QUIESCE, &req, sizeof(req),
669 &result, ES2_ARPC_CPORT_TIMEOUT + timeout);
670 if (ret) {
671 dev_err(dev, "failed to quiesce cport %u: %d (%d)\n",
672 cport_id, ret, result);
673 return ret;
674 }
675
676 return 0;
677 }
678
679 static int es2_cport_clear(struct gb_host_device *hd, u16 cport_id)
680 {
681 struct es2_ap_dev *es2 = hd_to_es2(hd);
682 struct device *dev = &es2->usb_dev->dev;
683 struct arpc_cport_clear_req req;
684 int ret;
685
686 req.cport_id = cpu_to_le16(cport_id);
687 ret = arpc_sync(es2, ARPC_TYPE_CPORT_CLEAR, &req, sizeof(req),
688 NULL, ES2_ARPC_CPORT_TIMEOUT);
689 if (ret) {
690 dev_err(dev, "failed to clear cport %u: %d\n", cport_id, ret);
691 return ret;
692 }
693
694 return 0;
695 }
696
697 static int latency_tag_enable(struct gb_host_device *hd, u16 cport_id)
698 {
699 int retval;
700 struct es2_ap_dev *es2 = hd_to_es2(hd);
701 struct usb_device *udev = es2->usb_dev;
702
703 retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
704 GB_APB_REQUEST_LATENCY_TAG_EN,
705 USB_DIR_OUT | USB_TYPE_VENDOR |
706 USB_RECIP_INTERFACE, cport_id, 0, NULL,
707 0, ES2_USB_CTRL_TIMEOUT);
708
709 if (retval < 0)
710 dev_err(&udev->dev, "Cannot enable latency tag for cport %d\n",
711 cport_id);
712 return retval;
713 }
714
715 static int latency_tag_disable(struct gb_host_device *hd, u16 cport_id)
716 {
717 int retval;
718 struct es2_ap_dev *es2 = hd_to_es2(hd);
719 struct usb_device *udev = es2->usb_dev;
720
721 retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
722 GB_APB_REQUEST_LATENCY_TAG_DIS,
723 USB_DIR_OUT | USB_TYPE_VENDOR |
724 USB_RECIP_INTERFACE, cport_id, 0, NULL,
725 0, ES2_USB_CTRL_TIMEOUT);
726
727 if (retval < 0)
728 dev_err(&udev->dev, "Cannot disable latency tag for cport %d\n",
729 cport_id);
730 return retval;
731 }
732
733 static struct gb_hd_driver es2_driver = {
734 .hd_priv_size = sizeof(struct es2_ap_dev),
735 .message_send = message_send,
736 .message_cancel = message_cancel,
737 .cport_allocate = es2_cport_allocate,
738 .cport_release = es2_cport_release,
739 .cport_enable = cport_enable,
740 .cport_connected = es2_cport_connected,
741 .cport_flush = es2_cport_flush,
742 .cport_shutdown = es2_cport_shutdown,
743 .cport_quiesce = es2_cport_quiesce,
744 .cport_clear = es2_cport_clear,
745 .latency_tag_enable = latency_tag_enable,
746 .latency_tag_disable = latency_tag_disable,
747 .output = output,
748 };
749
750 /* Common function to report consistent warnings based on URB status */
751 static int check_urb_status(struct urb *urb)
752 {
753 struct device *dev = &urb->dev->dev;
754 int status = urb->status;
755
756 switch (status) {
757 case 0:
758 return 0;
759
760 case -EOVERFLOW:
761 dev_err(dev, "%s: overflow actual length is %d\n",
762 __func__, urb->actual_length);
763 /* fall through */
764 case -ECONNRESET:
765 case -ENOENT:
766 case -ESHUTDOWN:
767 case -EILSEQ:
768 case -EPROTO:
769 /* device is gone, stop sending */
770 return status;
771 }
772 dev_err(dev, "%s: unknown status %d\n", __func__, status);
773
774 return -EAGAIN;
775 }
776
777 static void es2_destroy(struct es2_ap_dev *es2)
778 {
779 struct usb_device *udev;
780 struct urb *urb;
781 int i;
782
783 debugfs_remove(es2->apb_log_enable_dentry);
784 usb_log_disable(es2);
785
786 /* Tear down everything! */
787 for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
788 urb = es2->cport_out_urb[i];
789 usb_kill_urb(urb);
790 usb_free_urb(urb);
791 es2->cport_out_urb[i] = NULL;
792 es2->cport_out_urb_busy[i] = false; /* just to be anal */
793 }
794
795 for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
796 usb_free_urb(es2->arpc_urb[i]);
797 kfree(es2->arpc_buffer[i]);
798 es2->arpc_buffer[i] = NULL;
799 }
800
801 for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
802 usb_free_urb(es2->cport_in.urb[i]);
803 kfree(es2->cport_in.buffer[i]);
804 es2->cport_in.buffer[i] = NULL;
805 }
806
807 /* release reserved CDSI0 and CDSI1 cports */
808 gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI1);
809 gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI0);
810
811 udev = es2->usb_dev;
812 gb_hd_put(es2->hd);
813
814 usb_put_dev(udev);
815 }
816
817 static void cport_in_callback(struct urb *urb)
818 {
819 struct gb_host_device *hd = urb->context;
820 struct device *dev = &urb->dev->dev;
821 struct gb_operation_msg_hdr *header;
822 int status = check_urb_status(urb);
823 int retval;
824 u16 cport_id;
825
826 if (status) {
827 if ((status == -EAGAIN) || (status == -EPROTO))
828 goto exit;
829
830 /* The urb is being unlinked */
831 if (status == -ENOENT || status == -ESHUTDOWN)
832 return;
833
834 dev_err(dev, "urb cport in error %d (dropped)\n", status);
835 return;
836 }
837
838 if (urb->actual_length < sizeof(*header)) {
839 dev_err(dev, "short message received\n");
840 goto exit;
841 }
842
843 /* Extract the CPort id, which is packed in the message header */
844 header = urb->transfer_buffer;
845 cport_id = gb_message_cport_unpack(header);
846
847 if (cport_id_valid(hd, cport_id)) {
848 greybus_data_rcvd(hd, cport_id, urb->transfer_buffer,
849 urb->actual_length);
850 } else {
851 dev_err(dev, "invalid cport id %u received\n", cport_id);
852 }
853 exit:
854 /* put our urb back in the request pool */
855 retval = usb_submit_urb(urb, GFP_ATOMIC);
856 if (retval)
857 dev_err(dev, "failed to resubmit in-urb: %d\n", retval);
858 }
859
860 static void cport_out_callback(struct urb *urb)
861 {
862 struct gb_message *message = urb->context;
863 struct gb_host_device *hd = message->operation->connection->hd;
864 struct es2_ap_dev *es2 = hd_to_es2(hd);
865 int status = check_urb_status(urb);
866 unsigned long flags;
867
868 gb_message_cport_clear(message->header);
869
870 spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
871 message->hcpriv = NULL;
872 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
873
874 /*
875 * Tell the submitter that the message send (attempt) is
876 * complete, and report the status.
877 */
878 greybus_message_sent(hd, message, status);
879
880 free_urb(es2, urb);
881 }
882
883 static struct arpc *arpc_alloc(void *payload, u16 size, u8 type)
884 {
885 struct arpc *rpc;
886
887 if (size + sizeof(*rpc->req) > ARPC_OUT_SIZE_MAX)
888 return NULL;
889
890 rpc = kzalloc(sizeof(*rpc), GFP_KERNEL);
891 if (!rpc)
892 return NULL;
893
894 INIT_LIST_HEAD(&rpc->list);
895 rpc->req = kzalloc(sizeof(*rpc->req) + size, GFP_KERNEL);
896 if (!rpc->req)
897 goto err_free_rpc;
898
899 rpc->resp = kzalloc(sizeof(*rpc->resp), GFP_KERNEL);
900 if (!rpc->resp)
901 goto err_free_req;
902
903 rpc->req->type = type;
904 rpc->req->size = cpu_to_le16(sizeof(*rpc->req) + size);
905 memcpy(rpc->req->data, payload, size);
906
907 init_completion(&rpc->response_received);
908
909 return rpc;
910
911 err_free_req:
912 kfree(rpc->req);
913 err_free_rpc:
914 kfree(rpc);
915
916 return NULL;
917 }
918
919 static void arpc_free(struct arpc *rpc)
920 {
921 kfree(rpc->req);
922 kfree(rpc->resp);
923 kfree(rpc);
924 }
925
926 static struct arpc *arpc_find(struct es2_ap_dev *es2, __le16 id)
927 {
928 struct arpc *rpc;
929
930 list_for_each_entry(rpc, &es2->arpcs, list) {
931 if (rpc->req->id == id)
932 return rpc;
933 }
934
935 return NULL;
936 }
937
938 static void arpc_add(struct es2_ap_dev *es2, struct arpc *rpc)
939 {
940 rpc->active = true;
941 rpc->req->id = cpu_to_le16(es2->arpc_id_cycle++);
942 list_add_tail(&rpc->list, &es2->arpcs);
943 }
944
945 static void arpc_del(struct es2_ap_dev *es2, struct arpc *rpc)
946 {
947 if (rpc->active) {
948 rpc->active = false;
949 list_del(&rpc->list);
950 }
951 }
952
953 static int arpc_send(struct es2_ap_dev *es2, struct arpc *rpc, int timeout)
954 {
955 struct usb_device *udev = es2->usb_dev;
956 int retval;
957
958 retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
959 GB_APB_REQUEST_ARPC_RUN,
960 USB_DIR_OUT | USB_TYPE_VENDOR |
961 USB_RECIP_INTERFACE,
962 0, 0,
963 rpc->req, le16_to_cpu(rpc->req->size),
964 ES2_USB_CTRL_TIMEOUT);
965 if (retval != le16_to_cpu(rpc->req->size)) {
966 dev_err(&udev->dev,
967 "failed to send ARPC request %d: %d\n",
968 rpc->req->type, retval);
969 if (retval > 0)
970 retval = -EIO;
971 return retval;
972 }
973
974 return 0;
975 }
976
977 static int arpc_sync(struct es2_ap_dev *es2, u8 type, void *payload,
978 size_t size, int *result, unsigned int timeout)
979 {
980 struct arpc *rpc;
981 unsigned long flags;
982 int retval;
983
984 if (result)
985 *result = 0;
986
987 rpc = arpc_alloc(payload, size, type);
988 if (!rpc)
989 return -ENOMEM;
990
991 spin_lock_irqsave(&es2->arpc_lock, flags);
992 arpc_add(es2, rpc);
993 spin_unlock_irqrestore(&es2->arpc_lock, flags);
994
995 retval = arpc_send(es2, rpc, timeout);
996 if (retval)
997 goto out_arpc_del;
998
999 retval = wait_for_completion_interruptible_timeout(
1000 &rpc->response_received,
1001 msecs_to_jiffies(timeout));
1002 if (retval <= 0) {
1003 if (!retval)
1004 retval = -ETIMEDOUT;
1005 goto out_arpc_del;
1006 }
1007
1008 if (rpc->resp->result) {
1009 retval = -EREMOTEIO;
1010 if (result)
1011 *result = rpc->resp->result;
1012 } else {
1013 retval = 0;
1014 }
1015
1016 out_arpc_del:
1017 spin_lock_irqsave(&es2->arpc_lock, flags);
1018 arpc_del(es2, rpc);
1019 spin_unlock_irqrestore(&es2->arpc_lock, flags);
1020 arpc_free(rpc);
1021
1022 if (retval < 0 && retval != -EREMOTEIO) {
1023 dev_err(&es2->usb_dev->dev,
1024 "failed to execute ARPC: %d\n", retval);
1025 }
1026
1027 return retval;
1028 }
1029
1030 static void arpc_in_callback(struct urb *urb)
1031 {
1032 struct es2_ap_dev *es2 = urb->context;
1033 struct device *dev = &urb->dev->dev;
1034 int status = check_urb_status(urb);
1035 struct arpc *rpc;
1036 struct arpc_response_message *resp;
1037 unsigned long flags;
1038 int retval;
1039
1040 if (status) {
1041 if ((status == -EAGAIN) || (status == -EPROTO))
1042 goto exit;
1043
1044 /* The urb is being unlinked */
1045 if (status == -ENOENT || status == -ESHUTDOWN)
1046 return;
1047
1048 dev_err(dev, "arpc in-urb error %d (dropped)\n", status);
1049 return;
1050 }
1051
1052 if (urb->actual_length < sizeof(*resp)) {
1053 dev_err(dev, "short aprc response received\n");
1054 goto exit;
1055 }
1056
1057 resp = urb->transfer_buffer;
1058 spin_lock_irqsave(&es2->arpc_lock, flags);
1059 rpc = arpc_find(es2, resp->id);
1060 if (!rpc) {
1061 dev_err(dev, "invalid arpc response id received: %u\n",
1062 le16_to_cpu(resp->id));
1063 spin_unlock_irqrestore(&es2->arpc_lock, flags);
1064 goto exit;
1065 }
1066
1067 arpc_del(es2, rpc);
1068 memcpy(rpc->resp, resp, sizeof(*resp));
1069 complete(&rpc->response_received);
1070 spin_unlock_irqrestore(&es2->arpc_lock, flags);
1071
1072 exit:
1073 /* put our urb back in the request pool */
1074 retval = usb_submit_urb(urb, GFP_ATOMIC);
1075 if (retval)
1076 dev_err(dev, "failed to resubmit arpc in-urb: %d\n", retval);
1077 }
1078
1079 #define APB1_LOG_MSG_SIZE 64
1080 static void apb_log_get(struct es2_ap_dev *es2, char *buf)
1081 {
1082 int retval;
1083
1084 do {
1085 retval = usb_control_msg(es2->usb_dev,
1086 usb_rcvctrlpipe(es2->usb_dev, 0),
1087 GB_APB_REQUEST_LOG,
1088 USB_DIR_IN | USB_TYPE_VENDOR |
1089 USB_RECIP_INTERFACE,
1090 0x00, 0x00,
1091 buf,
1092 APB1_LOG_MSG_SIZE,
1093 ES2_USB_CTRL_TIMEOUT);
1094 if (retval > 0)
1095 kfifo_in(&es2->apb_log_fifo, buf, retval);
1096 } while (retval > 0);
1097 }
1098
1099 static int apb_log_poll(void *data)
1100 {
1101 struct es2_ap_dev *es2 = data;
1102 char *buf;
1103
1104 buf = kmalloc(APB1_LOG_MSG_SIZE, GFP_KERNEL);
1105 if (!buf)
1106 return -ENOMEM;
1107
1108 while (!kthread_should_stop()) {
1109 msleep(1000);
1110 apb_log_get(es2, buf);
1111 }
1112
1113 kfree(buf);
1114
1115 return 0;
1116 }
1117
1118 static ssize_t apb_log_read(struct file *f, char __user *buf,
1119 size_t count, loff_t *ppos)
1120 {
1121 struct es2_ap_dev *es2 = file_inode(f)->i_private;
1122 ssize_t ret;
1123 size_t copied;
1124 char *tmp_buf;
1125
1126 if (count > APB1_LOG_SIZE)
1127 count = APB1_LOG_SIZE;
1128
1129 tmp_buf = kmalloc(count, GFP_KERNEL);
1130 if (!tmp_buf)
1131 return -ENOMEM;
1132
1133 copied = kfifo_out(&es2->apb_log_fifo, tmp_buf, count);
1134 ret = simple_read_from_buffer(buf, count, ppos, tmp_buf, copied);
1135
1136 kfree(tmp_buf);
1137
1138 return ret;
1139 }
1140
1141 static const struct file_operations apb_log_fops = {
1142 .read = apb_log_read,
1143 };
1144
1145 static void usb_log_enable(struct es2_ap_dev *es2)
1146 {
1147 if (!IS_ERR_OR_NULL(es2->apb_log_task))
1148 return;
1149
1150 /* get log from APB1 */
1151 es2->apb_log_task = kthread_run(apb_log_poll, es2, "apb_log");
1152 if (IS_ERR(es2->apb_log_task))
1153 return;
1154 /* XXX We will need to rename this per APB */
1155 es2->apb_log_dentry = debugfs_create_file("apb_log", 0444,
1156 gb_debugfs_get(), es2,
1157 &apb_log_fops);
1158 }
1159
1160 static void usb_log_disable(struct es2_ap_dev *es2)
1161 {
1162 if (IS_ERR_OR_NULL(es2->apb_log_task))
1163 return;
1164
1165 debugfs_remove(es2->apb_log_dentry);
1166 es2->apb_log_dentry = NULL;
1167
1168 kthread_stop(es2->apb_log_task);
1169 es2->apb_log_task = NULL;
1170 }
1171
1172 static ssize_t apb_log_enable_read(struct file *f, char __user *buf,
1173 size_t count, loff_t *ppos)
1174 {
1175 struct es2_ap_dev *es2 = file_inode(f)->i_private;
1176 int enable = !IS_ERR_OR_NULL(es2->apb_log_task);
1177 char tmp_buf[3];
1178
1179 sprintf(tmp_buf, "%d\n", enable);
1180 return simple_read_from_buffer(buf, count, ppos, tmp_buf, 3);
1181 }
1182
1183 static ssize_t apb_log_enable_write(struct file *f, const char __user *buf,
1184 size_t count, loff_t *ppos)
1185 {
1186 int enable;
1187 ssize_t retval;
1188 struct es2_ap_dev *es2 = file_inode(f)->i_private;
1189
1190 retval = kstrtoint_from_user(buf, count, 10, &enable);
1191 if (retval)
1192 return retval;
1193
1194 if (enable)
1195 usb_log_enable(es2);
1196 else
1197 usb_log_disable(es2);
1198
1199 return count;
1200 }
1201
1202 static const struct file_operations apb_log_enable_fops = {
1203 .read = apb_log_enable_read,
1204 .write = apb_log_enable_write,
1205 };
1206
1207 static int apb_get_cport_count(struct usb_device *udev)
1208 {
1209 int retval;
1210 __le16 *cport_count;
1211
1212 cport_count = kzalloc(sizeof(*cport_count), GFP_KERNEL);
1213 if (!cport_count)
1214 return -ENOMEM;
1215
1216 retval = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
1217 GB_APB_REQUEST_CPORT_COUNT,
1218 USB_DIR_IN | USB_TYPE_VENDOR |
1219 USB_RECIP_INTERFACE, 0, 0, cport_count,
1220 sizeof(*cport_count), ES2_USB_CTRL_TIMEOUT);
1221 if (retval != sizeof(*cport_count)) {
1222 dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n",
1223 retval);
1224
1225 if (retval >= 0)
1226 retval = -EIO;
1227
1228 goto out;
1229 }
1230
1231 retval = le16_to_cpu(*cport_count);
1232
1233 /* We need to fit a CPort ID in one byte of a message header */
1234 if (retval > U8_MAX) {
1235 retval = U8_MAX;
1236 dev_warn(&udev->dev, "Limiting number of CPorts to U8_MAX\n");
1237 }
1238
1239 out:
1240 kfree(cport_count);
1241 return retval;
1242 }
1243
1244 /*
1245 * The ES2 USB Bridge device has 15 endpoints
1246 * 1 Control - usual USB stuff + AP -> APBridgeA messages
1247 * 7 Bulk IN - CPort data in
1248 * 7 Bulk OUT - CPort data out
1249 */
1250 static int ap_probe(struct usb_interface *interface,
1251 const struct usb_device_id *id)
1252 {
1253 struct es2_ap_dev *es2;
1254 struct gb_host_device *hd;
1255 struct usb_device *udev;
1256 struct usb_host_interface *iface_desc;
1257 struct usb_endpoint_descriptor *endpoint;
1258 __u8 ep_addr;
1259 int retval;
1260 int i;
1261 int num_cports;
1262 bool bulk_out_found = false;
1263 bool bulk_in_found = false;
1264 bool arpc_in_found = false;
1265
1266 udev = usb_get_dev(interface_to_usbdev(interface));
1267
1268 num_cports = apb_get_cport_count(udev);
1269 if (num_cports < 0) {
1270 usb_put_dev(udev);
1271 dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n",
1272 num_cports);
1273 return num_cports;
1274 }
1275
1276 hd = gb_hd_create(&es2_driver, &udev->dev, ES2_GBUF_MSG_SIZE_MAX,
1277 num_cports);
1278 if (IS_ERR(hd)) {
1279 usb_put_dev(udev);
1280 return PTR_ERR(hd);
1281 }
1282
1283 es2 = hd_to_es2(hd);
1284 es2->hd = hd;
1285 es2->usb_intf = interface;
1286 es2->usb_dev = udev;
1287 spin_lock_init(&es2->cport_out_urb_lock);
1288 INIT_KFIFO(es2->apb_log_fifo);
1289 usb_set_intfdata(interface, es2);
1290
1291 /*
1292 * Reserve the CDSI0 and CDSI1 CPorts so they won't be allocated
1293 * dynamically.
1294 */
1295 retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI0);
1296 if (retval)
1297 goto error;
1298 retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI1);
1299 if (retval)
1300 goto error;
1301
1302 /* find all bulk endpoints */
1303 iface_desc = interface->cur_altsetting;
1304 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1305 endpoint = &iface_desc->endpoint[i].desc;
1306 ep_addr = endpoint->bEndpointAddress;
1307
1308 if (usb_endpoint_is_bulk_in(endpoint)) {
1309 if (!bulk_in_found) {
1310 es2->cport_in.endpoint = ep_addr;
1311 bulk_in_found = true;
1312 } else if (!arpc_in_found) {
1313 es2->arpc_endpoint_in = ep_addr;
1314 arpc_in_found = true;
1315 } else {
1316 dev_warn(&udev->dev,
1317 "Unused bulk IN endpoint found: 0x%02x\n",
1318 ep_addr);
1319 }
1320 continue;
1321 }
1322 if (usb_endpoint_is_bulk_out(endpoint)) {
1323 if (!bulk_out_found) {
1324 es2->cport_out_endpoint = ep_addr;
1325 bulk_out_found = true;
1326 } else {
1327 dev_warn(&udev->dev,
1328 "Unused bulk OUT endpoint found: 0x%02x\n",
1329 ep_addr);
1330 }
1331 continue;
1332 }
1333 dev_warn(&udev->dev,
1334 "Unknown endpoint type found, address 0x%02x\n",
1335 ep_addr);
1336 }
1337 if (!bulk_in_found || !arpc_in_found || !bulk_out_found) {
1338 dev_err(&udev->dev, "Not enough endpoints found in device, aborting!\n");
1339 retval = -ENODEV;
1340 goto error;
1341 }
1342
1343 /* Allocate buffers for our cport in messages */
1344 for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
1345 struct urb *urb;
1346 u8 *buffer;
1347
1348 urb = usb_alloc_urb(0, GFP_KERNEL);
1349 if (!urb) {
1350 retval = -ENOMEM;
1351 goto error;
1352 }
1353 es2->cport_in.urb[i] = urb;
1354
1355 buffer = kmalloc(ES2_GBUF_MSG_SIZE_MAX, GFP_KERNEL);
1356 if (!buffer) {
1357 retval = -ENOMEM;
1358 goto error;
1359 }
1360
1361 usb_fill_bulk_urb(urb, udev,
1362 usb_rcvbulkpipe(udev, es2->cport_in.endpoint),
1363 buffer, ES2_GBUF_MSG_SIZE_MAX,
1364 cport_in_callback, hd);
1365
1366 es2->cport_in.buffer[i] = buffer;
1367 }
1368
1369 /* Allocate buffers for ARPC in messages */
1370 for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
1371 struct urb *urb;
1372 u8 *buffer;
1373
1374 urb = usb_alloc_urb(0, GFP_KERNEL);
1375 if (!urb) {
1376 retval = -ENOMEM;
1377 goto error;
1378 }
1379 es2->arpc_urb[i] = urb;
1380
1381 buffer = kmalloc(ARPC_IN_SIZE_MAX, GFP_KERNEL);
1382 if (!buffer) {
1383 retval = -ENOMEM;
1384 goto error;
1385 }
1386
1387 usb_fill_bulk_urb(urb, udev,
1388 usb_rcvbulkpipe(udev,
1389 es2->arpc_endpoint_in),
1390 buffer, ARPC_IN_SIZE_MAX,
1391 arpc_in_callback, es2);
1392
1393 es2->arpc_buffer[i] = buffer;
1394 }
1395
1396 /* Allocate urbs for our CPort OUT messages */
1397 for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
1398 struct urb *urb;
1399
1400 urb = usb_alloc_urb(0, GFP_KERNEL);
1401 if (!urb) {
1402 retval = -ENOMEM;
1403 goto error;
1404 }
1405
1406 es2->cport_out_urb[i] = urb;
1407 es2->cport_out_urb_busy[i] = false; /* just to be anal */
1408 }
1409
1410 /* XXX We will need to rename this per APB */
1411 es2->apb_log_enable_dentry = debugfs_create_file("apb_log_enable",
1412 0644,
1413 gb_debugfs_get(), es2,
1414 &apb_log_enable_fops);
1415
1416 INIT_LIST_HEAD(&es2->arpcs);
1417 spin_lock_init(&es2->arpc_lock);
1418
1419 retval = es2_arpc_in_enable(es2);
1420 if (retval)
1421 goto error;
1422
1423 retval = gb_hd_add(hd);
1424 if (retval)
1425 goto err_disable_arpc_in;
1426
1427 retval = es2_cport_in_enable(es2, &es2->cport_in);
1428 if (retval)
1429 goto err_hd_del;
1430
1431 return 0;
1432
1433 err_hd_del:
1434 gb_hd_del(hd);
1435 err_disable_arpc_in:
1436 es2_arpc_in_disable(es2);
1437 error:
1438 es2_destroy(es2);
1439
1440 return retval;
1441 }
1442
1443 static void ap_disconnect(struct usb_interface *interface)
1444 {
1445 struct es2_ap_dev *es2 = usb_get_intfdata(interface);
1446
1447 gb_hd_del(es2->hd);
1448
1449 es2_cport_in_disable(es2, &es2->cport_in);
1450 es2_arpc_in_disable(es2);
1451
1452 es2_destroy(es2);
1453 }
1454
1455 static struct usb_driver es2_ap_driver = {
1456 .name = "es2_ap_driver",
1457 .probe = ap_probe,
1458 .disconnect = ap_disconnect,
1459 .id_table = id_table,
1460 .soft_unbind = 1,
1461 };
1462
1463 module_usb_driver(es2_ap_driver);
1464
1465 MODULE_LICENSE("GPL v2");
1466 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
CRIS linux kernel tree