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mtd: nand: brcmnand: Check flash #WP pin status before nand erase/program
[linux/fpc-iii.git] / drivers / staging / greybus / es2.c
blobbaab460eeaa3828f7a3f84490f4dda566b647c44
1 /*
2 * Greybus "AP" USB driver for "ES2" controller chips
3 *
4 * Copyright 2014-2015 Google Inc.
5 * Copyright 2014-2015 Linaro Ltd.
6 *
7 * Released under the GPLv2 only.
8 */
9 #include <linux/kthread.h>
10 #include <linux/sizes.h>
11 #include <linux/usb.h>
12 #include <linux/kfifo.h>
13 #include <linux/debugfs.h>
14 #include <linux/list.h>
15 #include <asm/unaligned.h>
16
17 #include "arpc.h"
18 #include "greybus.h"
19 #include "greybus_trace.h"
20 #include "connection.h"
21
22
23 /* Default timeout for USB vendor requests. */
24 #define ES2_USB_CTRL_TIMEOUT 500
25
26 /* Default timeout for ARPC CPort requests */
27 #define ES2_ARPC_CPORT_TIMEOUT 500
28
29 /* Fixed CPort numbers */
30 #define ES2_CPORT_CDSI0 16
31 #define ES2_CPORT_CDSI1 17
32
33 /* Memory sizes for the buffers sent to/from the ES2 controller */
34 #define ES2_GBUF_MSG_SIZE_MAX 2048
35
36 /* Memory sizes for the ARPC buffers */
37 #define ARPC_OUT_SIZE_MAX U16_MAX
38 #define ARPC_IN_SIZE_MAX 128
39
40 static const struct usb_device_id id_table[] = {
41 { USB_DEVICE(0x18d1, 0x1eaf) },
42 { },
43 };
44 MODULE_DEVICE_TABLE(usb, id_table);
45
46 #define APB1_LOG_SIZE SZ_16K
47
48 /*
49 * Number of CPort IN urbs in flight at any point in time.
50 * Adjust if we are having stalls in the USB buffer due to not enough urbs in
51 * flight.
52 */
53 #define NUM_CPORT_IN_URB 4
54
55 /* Number of CPort OUT urbs in flight at any point in time.
56 * Adjust if we get messages saying we are out of urbs in the system log.
57 */
58 #define NUM_CPORT_OUT_URB 8
59
60 /*
61 * Number of ARPC in urbs in flight at any point in time.
62 */
63 #define NUM_ARPC_IN_URB 2
64
65 /*
66 * @endpoint: bulk in endpoint for CPort data
67 * @urb: array of urbs for the CPort in messages
68 * @buffer: array of buffers for the @cport_in_urb urbs
69 */
70 struct es2_cport_in {
71 __u8 endpoint;
72 struct urb *urb[NUM_CPORT_IN_URB];
73 u8 *buffer[NUM_CPORT_IN_URB];
74 };
75
76 /**
77 * es2_ap_dev - ES2 USB Bridge to AP structure
78 * @usb_dev: pointer to the USB device we are.
79 * @usb_intf: pointer to the USB interface we are bound to.
80 * @hd: pointer to our gb_host_device structure
81
82 * @cport_in: endpoint, urbs and buffer for cport in messages
83 * @cport_out_endpoint: endpoint for for cport out messages
84 * @cport_out_urb: array of urbs for the CPort out messages
85 * @cport_out_urb_busy: array of flags to see if the @cport_out_urb is busy or
86 * not.
87 * @cport_out_urb_cancelled: array of flags indicating whether the
88 * corresponding @cport_out_urb is being cancelled
89 * @cport_out_urb_lock: locks the @cport_out_urb_busy "list"
90 *
91 * @apb_log_task: task pointer for logging thread
92 * @apb_log_dentry: file system entry for the log file interface
93 * @apb_log_enable_dentry: file system entry for enabling logging
94 * @apb_log_fifo: kernel FIFO to carry logged data
95 * @arpc_urb: array of urbs for the ARPC in messages
96 * @arpc_buffer: array of buffers for the @arpc_urb urbs
97 * @arpc_endpoint_in: bulk in endpoint for APBridgeA RPC
98 * @arpc_id_cycle: gives an unique id to ARPC
99 * @arpc_lock: locks ARPC list
100 * @arpcs: list of in progress ARPCs
101 */
102 struct es2_ap_dev {
103 struct usb_device *usb_dev;
104 struct usb_interface *usb_intf;
105 struct gb_host_device *hd;
106
107 struct es2_cport_in cport_in;
108 __u8 cport_out_endpoint;
109 struct urb *cport_out_urb[NUM_CPORT_OUT_URB];
110 bool cport_out_urb_busy[NUM_CPORT_OUT_URB];
111 bool cport_out_urb_cancelled[NUM_CPORT_OUT_URB];
112 spinlock_t cport_out_urb_lock;
113
114 bool cdsi1_in_use;
115
116 struct task_struct *apb_log_task;
117 struct dentry *apb_log_dentry;
118 struct dentry *apb_log_enable_dentry;
119 DECLARE_KFIFO(apb_log_fifo, char, APB1_LOG_SIZE);
120
121 __u8 arpc_endpoint_in;
122 struct urb *arpc_urb[NUM_ARPC_IN_URB];
123 u8 *arpc_buffer[NUM_ARPC_IN_URB];
124
125 int arpc_id_cycle;
126 spinlock_t arpc_lock;
127 struct list_head arpcs;
128 };
129
130 /**
131 * timesync_enable_request - Enable timesync in an APBridge
132 * @count: number of TimeSync Pulses to expect
133 * @frame_time: the initial FrameTime at the first TimeSync Pulse
134 * @strobe_delay: the expected delay in microseconds between each TimeSync Pulse
135 * @refclk: The AP mandated reference clock to run FrameTime at
136 */
137 struct timesync_enable_request {
138 __u8 count;
139 __le64 frame_time;
140 __le32 strobe_delay;
141 __le32 refclk;
142 } __packed;
143
144 /**
145 * timesync_authoritative_request - Transmit authoritative FrameTime to APBridge
146 * @frame_time: An array of authoritative FrameTimes provided by the SVC
147 * and relayed to the APBridge by the AP
148 */
149 struct timesync_authoritative_request {
150 __le64 frame_time[GB_TIMESYNC_MAX_STROBES];
151 } __packed;
152
153 struct arpc {
154 struct list_head list;
155 struct arpc_request_message *req;
156 struct arpc_response_message *resp;
157 struct completion response_received;
158 bool active;
159 };
160
161 static inline struct es2_ap_dev *hd_to_es2(struct gb_host_device *hd)
162 {
163 return (struct es2_ap_dev *)&hd->hd_priv;
164 }
165
166 static void cport_out_callback(struct urb *urb);
167 static void usb_log_enable(struct es2_ap_dev *es2);
168 static void usb_log_disable(struct es2_ap_dev *es2);
169 static int arpc_sync(struct es2_ap_dev *es2, u8 type, void *payload,
170 size_t size, int *result, unsigned int timeout);
171
172 static int output_sync(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd)
173 {
174 struct usb_device *udev = es2->usb_dev;
175 u8 *data;
176 int retval;
177
178 data = kmalloc(size, GFP_KERNEL);
179 if (!data)
180 return -ENOMEM;
181 memcpy(data, req, size);
182
183 retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
184 cmd,
185 USB_DIR_OUT | USB_TYPE_VENDOR |
186 USB_RECIP_INTERFACE,
187 0, 0, data, size, ES2_USB_CTRL_TIMEOUT);
188 if (retval < 0)
189 dev_err(&udev->dev, "%s: return error %d\n", __func__, retval);
190 else
191 retval = 0;
192
193 kfree(data);
194 return retval;
195 }
196
197 static void ap_urb_complete(struct urb *urb)
198 {
199 struct usb_ctrlrequest *dr = urb->context;
200
201 kfree(dr);
202 usb_free_urb(urb);
203 }
204
205 static int output_async(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd)
206 {
207 struct usb_device *udev = es2->usb_dev;
208 struct urb *urb;
209 struct usb_ctrlrequest *dr;
210 u8 *buf;
211 int retval;
212
213 urb = usb_alloc_urb(0, GFP_ATOMIC);
214 if (!urb)
215 return -ENOMEM;
216
217 dr = kmalloc(sizeof(*dr) + size, GFP_ATOMIC);
218 if (!dr) {
219 usb_free_urb(urb);
220 return -ENOMEM;
221 }
222
223 buf = (u8 *)dr + sizeof(*dr);
224 memcpy(buf, req, size);
225
226 dr->bRequest = cmd;
227 dr->bRequestType = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE;
228 dr->wValue = 0;
229 dr->wIndex = 0;
230 dr->wLength = cpu_to_le16(size);
231
232 usb_fill_control_urb(urb, udev, usb_sndctrlpipe(udev, 0),
233 (unsigned char *)dr, buf, size,
234 ap_urb_complete, dr);
235 retval = usb_submit_urb(urb, GFP_ATOMIC);
236 if (retval) {
237 usb_free_urb(urb);
238 kfree(dr);
239 }
240 return retval;
241 }
242
243 static int output(struct gb_host_device *hd, void *req, u16 size, u8 cmd,
244 bool async)
245 {
246 struct es2_ap_dev *es2 = hd_to_es2(hd);
247
248 if (async)
249 return output_async(es2, req, size, cmd);
250
251 return output_sync(es2, req, size, cmd);
252 }
253
254 static int es2_cport_in_enable(struct es2_ap_dev *es2,
255 struct es2_cport_in *cport_in)
256 {
257 struct urb *urb;
258 int ret;
259 int i;
260
261 for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
262 urb = cport_in->urb[i];
263
264 ret = usb_submit_urb(urb, GFP_KERNEL);
265 if (ret) {
266 dev_err(&es2->usb_dev->dev,
267 "failed to submit in-urb: %d\n", ret);
268 goto err_kill_urbs;
269 }
270 }
271
272 return 0;
273
274 err_kill_urbs:
275 for (--i; i >= 0; --i) {
276 urb = cport_in->urb[i];
277 usb_kill_urb(urb);
278 }
279
280 return ret;
281 }
282
283 static void es2_cport_in_disable(struct es2_ap_dev *es2,
284 struct es2_cport_in *cport_in)
285 {
286 struct urb *urb;
287 int i;
288
289 for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
290 urb = cport_in->urb[i];
291 usb_kill_urb(urb);
292 }
293 }
294
295 static int es2_arpc_in_enable(struct es2_ap_dev *es2)
296 {
297 struct urb *urb;
298 int ret;
299 int i;
300
301 for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
302 urb = es2->arpc_urb[i];
303
304 ret = usb_submit_urb(urb, GFP_KERNEL);
305 if (ret) {
306 dev_err(&es2->usb_dev->dev,
307 "failed to submit arpc in-urb: %d\n", ret);
308 goto err_kill_urbs;
309 }
310 }
311
312 return 0;
313
314 err_kill_urbs:
315 for (--i; i >= 0; --i) {
316 urb = es2->arpc_urb[i];
317 usb_kill_urb(urb);
318 }
319
320 return ret;
321 }
322
323 static void es2_arpc_in_disable(struct es2_ap_dev *es2)
324 {
325 struct urb *urb;
326 int i;
327
328 for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
329 urb = es2->arpc_urb[i];
330 usb_kill_urb(urb);
331 }
332 }
333
334 static struct urb *next_free_urb(struct es2_ap_dev *es2, gfp_t gfp_mask)
335 {
336 struct urb *urb = NULL;
337 unsigned long flags;
338 int i;
339
340 spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
341
342 /* Look in our pool of allocated urbs first, as that's the "fastest" */
343 for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
344 if (es2->cport_out_urb_busy[i] == false &&
345 es2->cport_out_urb_cancelled[i] == false) {
346 es2->cport_out_urb_busy[i] = true;
347 urb = es2->cport_out_urb[i];
348 break;
349 }
350 }
351 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
352 if (urb)
353 return urb;
354
355 /*
356 * Crap, pool is empty, complain to the syslog and go allocate one
357 * dynamically as we have to succeed.
358 */
359 dev_dbg(&es2->usb_dev->dev,
360 "No free CPort OUT urbs, having to dynamically allocate one!\n");
361 return usb_alloc_urb(0, gfp_mask);
362 }
363
364 static void free_urb(struct es2_ap_dev *es2, struct urb *urb)
365 {
366 unsigned long flags;
367 int i;
368 /*
369 * See if this was an urb in our pool, if so mark it "free", otherwise
370 * we need to free it ourselves.
371 */
372 spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
373 for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
374 if (urb == es2->cport_out_urb[i]) {
375 es2->cport_out_urb_busy[i] = false;
376 urb = NULL;
377 break;
378 }
379 }
380 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
381
382 /* If urb is not NULL, then we need to free this urb */
383 usb_free_urb(urb);
384 }
385
386 /*
387 * We (ab)use the operation-message header pad bytes to transfer the
388 * cport id in order to minimise overhead.
389 */
390 static void
391 gb_message_cport_pack(struct gb_operation_msg_hdr *header, u16 cport_id)
392 {
393 header->pad[0] = cport_id;
394 }
395
396 /* Clear the pad bytes used for the CPort id */
397 static void gb_message_cport_clear(struct gb_operation_msg_hdr *header)
398 {
399 header->pad[0] = 0;
400 }
401
402 /* Extract the CPort id packed into the header, and clear it */
403 static u16 gb_message_cport_unpack(struct gb_operation_msg_hdr *header)
404 {
405 u16 cport_id = header->pad[0];
406
407 gb_message_cport_clear(header);
408
409 return cport_id;
410 }
411
412 /*
413 * Returns zero if the message was successfully queued, or a negative errno
414 * otherwise.
415 */
416 static int message_send(struct gb_host_device *hd, u16 cport_id,
417 struct gb_message *message, gfp_t gfp_mask)
418 {
419 struct es2_ap_dev *es2 = hd_to_es2(hd);
420 struct usb_device *udev = es2->usb_dev;
421 size_t buffer_size;
422 int retval;
423 struct urb *urb;
424 unsigned long flags;
425
426 /*
427 * The data actually transferred will include an indication
428 * of where the data should be sent. Do one last check of
429 * the target CPort id before filling it in.
430 */
431 if (!cport_id_valid(hd, cport_id)) {
432 dev_err(&udev->dev, "invalid cport %u\n", cport_id);
433 return -EINVAL;
434 }
435
436 /* Find a free urb */
437 urb = next_free_urb(es2, gfp_mask);
438 if (!urb)
439 return -ENOMEM;
440
441 spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
442 message->hcpriv = urb;
443 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
444
445 /* Pack the cport id into the message header */
446 gb_message_cport_pack(message->header, cport_id);
447
448 buffer_size = sizeof(*message->header) + message->payload_size;
449
450 usb_fill_bulk_urb(urb, udev,
451 usb_sndbulkpipe(udev,
452 es2->cport_out_endpoint),
453 message->buffer, buffer_size,
454 cport_out_callback, message);
455 urb->transfer_flags |= URB_ZERO_PACKET;
456
457 trace_gb_message_submit(message);
458
459 retval = usb_submit_urb(urb, gfp_mask);
460 if (retval) {
461 dev_err(&udev->dev, "failed to submit out-urb: %d\n", retval);
462
463 spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
464 message->hcpriv = NULL;
465 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
466
467 free_urb(es2, urb);
468 gb_message_cport_clear(message->header);
469
470 return retval;
471 }
472
473 return 0;
474 }
475
476 /*
477 * Can not be called in atomic context.
478 */
479 static void message_cancel(struct gb_message *message)
480 {
481 struct gb_host_device *hd = message->operation->connection->hd;
482 struct es2_ap_dev *es2 = hd_to_es2(hd);
483 struct urb *urb;
484 int i;
485
486 might_sleep();
487
488 spin_lock_irq(&es2->cport_out_urb_lock);
489 urb = message->hcpriv;
490
491 /* Prevent dynamically allocated urb from being deallocated. */
492 usb_get_urb(urb);
493
494 /* Prevent pre-allocated urb from being reused. */
495 for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
496 if (urb == es2->cport_out_urb[i]) {
497 es2->cport_out_urb_cancelled[i] = true;
498 break;
499 }
500 }
501 spin_unlock_irq(&es2->cport_out_urb_lock);
502
503 usb_kill_urb(urb);
504
505 if (i < NUM_CPORT_OUT_URB) {
506 spin_lock_irq(&es2->cport_out_urb_lock);
507 es2->cport_out_urb_cancelled[i] = false;
508 spin_unlock_irq(&es2->cport_out_urb_lock);
509 }
510
511 usb_free_urb(urb);
512 }
513
514 static int es2_cport_allocate(struct gb_host_device *hd, int cport_id,
515 unsigned long flags)
516 {
517 struct es2_ap_dev *es2 = hd_to_es2(hd);
518 struct ida *id_map = &hd->cport_id_map;
519 int ida_start, ida_end;
520
521 switch (cport_id) {
522 case ES2_CPORT_CDSI0:
523 case ES2_CPORT_CDSI1:
524 dev_err(&hd->dev, "cport %d not available\n", cport_id);
525 return -EBUSY;
526 }
527
528 if (flags & GB_CONNECTION_FLAG_OFFLOADED &&
529 flags & GB_CONNECTION_FLAG_CDSI1) {
530 if (es2->cdsi1_in_use) {
531 dev_err(&hd->dev, "CDSI1 already in use\n");
532 return -EBUSY;
533 }
534
535 es2->cdsi1_in_use = true;
536
537 return ES2_CPORT_CDSI1;
538 }
539
540 if (cport_id < 0) {
541 ida_start = 0;
542 ida_end = hd->num_cports;
543 } else if (cport_id < hd->num_cports) {
544 ida_start = cport_id;
545 ida_end = cport_id + 1;
546 } else {
547 dev_err(&hd->dev, "cport %d not available\n", cport_id);
548 return -EINVAL;
549 }
550
551 return ida_simple_get(id_map, ida_start, ida_end, GFP_KERNEL);
552 }
553
554 static void es2_cport_release(struct gb_host_device *hd, u16 cport_id)
555 {
556 struct es2_ap_dev *es2 = hd_to_es2(hd);
557
558 switch (cport_id) {
559 case ES2_CPORT_CDSI1:
560 es2->cdsi1_in_use = false;
561 return;
562 }
563
564 ida_simple_remove(&hd->cport_id_map, cport_id);
565 }
566
567 static int cport_enable(struct gb_host_device *hd, u16 cport_id,
568 unsigned long flags)
569 {
570 struct es2_ap_dev *es2 = hd_to_es2(hd);
571 struct usb_device *udev = es2->usb_dev;
572 struct gb_apb_request_cport_flags *req;
573 u32 connection_flags;
574 int ret;
575
576 req = kzalloc(sizeof(*req), GFP_KERNEL);
577 if (!req)
578 return -ENOMEM;
579
580 connection_flags = 0;
581 if (flags & GB_CONNECTION_FLAG_CONTROL)
582 connection_flags |= GB_APB_CPORT_FLAG_CONTROL;
583 if (flags & GB_CONNECTION_FLAG_HIGH_PRIO)
584 connection_flags |= GB_APB_CPORT_FLAG_HIGH_PRIO;
585
586 req->flags = cpu_to_le32(connection_flags);
587
588 dev_dbg(&hd->dev, "%s - cport = %u, flags = %02x\n", __func__,
589 cport_id, connection_flags);
590
591 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
592 GB_APB_REQUEST_CPORT_FLAGS,
593 USB_DIR_OUT | USB_TYPE_VENDOR |
594 USB_RECIP_INTERFACE, cport_id, 0,
595 req, sizeof(*req), ES2_USB_CTRL_TIMEOUT);
596 if (ret != sizeof(*req)) {
597 dev_err(&udev->dev, "failed to set cport flags for port %d\n",
598 cport_id);
599 if (ret >= 0)
600 ret = -EIO;
601
602 goto out;
603 }
604
605 ret = 0;
606 out:
607 kfree(req);
608
609 return ret;
610 }
611
612 static int es2_cport_connected(struct gb_host_device *hd, u16 cport_id)
613 {
614 struct es2_ap_dev *es2 = hd_to_es2(hd);
615 struct device *dev = &es2->usb_dev->dev;
616 struct arpc_cport_connected_req req;
617 int ret;
618
619 req.cport_id = cpu_to_le16(cport_id);
620 ret = arpc_sync(es2, ARPC_TYPE_CPORT_CONNECTED, &req, sizeof(req),
621 NULL, ES2_ARPC_CPORT_TIMEOUT);
622 if (ret) {
623 dev_err(dev, "failed to set connected state for cport %u: %d\n",
624 cport_id, ret);
625 return ret;
626 }
627
628 return 0;
629 }
630
631 static int es2_cport_flush(struct gb_host_device *hd, u16 cport_id)
632 {
633 struct es2_ap_dev *es2 = hd_to_es2(hd);
634 struct device *dev = &es2->usb_dev->dev;
635 struct arpc_cport_flush_req req;
636 int ret;
637
638 req.cport_id = cpu_to_le16(cport_id);
639 ret = arpc_sync(es2, ARPC_TYPE_CPORT_FLUSH, &req, sizeof(req),
640 NULL, ES2_ARPC_CPORT_TIMEOUT);
641 if (ret) {
642 dev_err(dev, "failed to flush cport %u: %d\n", cport_id, ret);
643 return ret;
644 }
645
646 return 0;
647 }
648
649 static int es2_cport_shutdown(struct gb_host_device *hd, u16 cport_id,
650 u8 phase, 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_shutdown_req req;
655 int result;
656 int ret;
657
658 if (timeout > U16_MAX)
659 return -EINVAL;
660
661 req.cport_id = cpu_to_le16(cport_id);
662 req.timeout = cpu_to_le16(timeout);
663 req.phase = phase;
664 ret = arpc_sync(es2, ARPC_TYPE_CPORT_SHUTDOWN, &req, sizeof(req),
665 &result, ES2_ARPC_CPORT_TIMEOUT + timeout);
666 if (ret) {
667 dev_err(dev, "failed to send shutdown over cport %u: %d (%d)\n",
668 cport_id, ret, result);
669 return ret;
670 }
671
672 return 0;
673 }
674
675 static int es2_cport_quiesce(struct gb_host_device *hd, u16 cport_id,
676 size_t peer_space, unsigned int timeout)
677 {
678 struct es2_ap_dev *es2 = hd_to_es2(hd);
679 struct device *dev = &es2->usb_dev->dev;
680 struct arpc_cport_quiesce_req req;
681 int result;
682 int ret;
683
684 if (peer_space > U16_MAX)
685 return -EINVAL;
686
687 if (timeout > U16_MAX)
688 return -EINVAL;
689
690 req.cport_id = cpu_to_le16(cport_id);
691 req.peer_space = cpu_to_le16(peer_space);
692 req.timeout = cpu_to_le16(timeout);
693 ret = arpc_sync(es2, ARPC_TYPE_CPORT_QUIESCE, &req, sizeof(req),
694 &result, ES2_ARPC_CPORT_TIMEOUT + timeout);
695 if (ret) {
696 dev_err(dev, "failed to quiesce cport %u: %d (%d)\n",
697 cport_id, ret, result);
698 return ret;
699 }
700
701 return 0;
702 }
703
704 static int es2_cport_clear(struct gb_host_device *hd, u16 cport_id)
705 {
706 struct es2_ap_dev *es2 = hd_to_es2(hd);
707 struct device *dev = &es2->usb_dev->dev;
708 struct arpc_cport_clear_req req;
709 int ret;
710
711 req.cport_id = cpu_to_le16(cport_id);
712 ret = arpc_sync(es2, ARPC_TYPE_CPORT_CLEAR, &req, sizeof(req),
713 NULL, ES2_ARPC_CPORT_TIMEOUT);
714 if (ret) {
715 dev_err(dev, "failed to clear cport %u: %d\n", cport_id, ret);
716 return ret;
717 }
718
719 return 0;
720 }
721
722 static int latency_tag_enable(struct gb_host_device *hd, u16 cport_id)
723 {
724 int retval;
725 struct es2_ap_dev *es2 = hd_to_es2(hd);
726 struct usb_device *udev = es2->usb_dev;
727
728 retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
729 GB_APB_REQUEST_LATENCY_TAG_EN,
730 USB_DIR_OUT | USB_TYPE_VENDOR |
731 USB_RECIP_INTERFACE, cport_id, 0, NULL,
732 0, ES2_USB_CTRL_TIMEOUT);
733
734 if (retval < 0)
735 dev_err(&udev->dev, "Cannot enable latency tag for cport %d\n",
736 cport_id);
737 return retval;
738 }
739
740 static int latency_tag_disable(struct gb_host_device *hd, u16 cport_id)
741 {
742 int retval;
743 struct es2_ap_dev *es2 = hd_to_es2(hd);
744 struct usb_device *udev = es2->usb_dev;
745
746 retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
747 GB_APB_REQUEST_LATENCY_TAG_DIS,
748 USB_DIR_OUT | USB_TYPE_VENDOR |
749 USB_RECIP_INTERFACE, cport_id, 0, NULL,
750 0, ES2_USB_CTRL_TIMEOUT);
751
752 if (retval < 0)
753 dev_err(&udev->dev, "Cannot disable latency tag for cport %d\n",
754 cport_id);
755 return retval;
756 }
757
758 static int timesync_enable(struct gb_host_device *hd, u8 count,
759 u64 frame_time, u32 strobe_delay, u32 refclk)
760 {
761 int retval;
762 struct es2_ap_dev *es2 = hd_to_es2(hd);
763 struct usb_device *udev = es2->usb_dev;
764 struct gb_control_timesync_enable_request *request;
765
766 request = kzalloc(sizeof(*request), GFP_KERNEL);
767 if (!request)
768 return -ENOMEM;
769
770 request->count = count;
771 request->frame_time = cpu_to_le64(frame_time);
772 request->strobe_delay = cpu_to_le32(strobe_delay);
773 request->refclk = cpu_to_le32(refclk);
774 retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
775 GB_APB_REQUEST_TIMESYNC_ENABLE,
776 USB_DIR_OUT | USB_TYPE_VENDOR |
777 USB_RECIP_INTERFACE, 0, 0, request,
778 sizeof(*request), ES2_USB_CTRL_TIMEOUT);
779 if (retval < 0)
780 dev_err(&udev->dev, "Cannot enable timesync %d\n", retval);
781
782 kfree(request);
783 return retval;
784 }
785
786 static int timesync_disable(struct gb_host_device *hd)
787 {
788 int retval;
789 struct es2_ap_dev *es2 = hd_to_es2(hd);
790 struct usb_device *udev = es2->usb_dev;
791
792 retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
793 GB_APB_REQUEST_TIMESYNC_DISABLE,
794 USB_DIR_OUT | USB_TYPE_VENDOR |
795 USB_RECIP_INTERFACE, 0, 0, NULL,
796 0, ES2_USB_CTRL_TIMEOUT);
797 if (retval < 0)
798 dev_err(&udev->dev, "Cannot disable timesync %d\n", retval);
799
800 return retval;
801 }
802
803 static int timesync_authoritative(struct gb_host_device *hd, u64 *frame_time)
804 {
805 int retval, i;
806 struct es2_ap_dev *es2 = hd_to_es2(hd);
807 struct usb_device *udev = es2->usb_dev;
808 struct timesync_authoritative_request *request;
809
810 request = kzalloc(sizeof(*request), GFP_KERNEL);
811 if (!request)
812 return -ENOMEM;
813
814 for (i = 0; i < GB_TIMESYNC_MAX_STROBES; i++)
815 request->frame_time[i] = cpu_to_le64(frame_time[i]);
816
817 retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
818 GB_APB_REQUEST_TIMESYNC_AUTHORITATIVE,
819 USB_DIR_OUT | USB_TYPE_VENDOR |
820 USB_RECIP_INTERFACE, 0, 0, request,
821 sizeof(*request), ES2_USB_CTRL_TIMEOUT);
822 if (retval < 0)
823 dev_err(&udev->dev, "Cannot timesync authoritative out %d\n", retval);
824
825 kfree(request);
826 return retval;
827 }
828
829 static int timesync_get_last_event(struct gb_host_device *hd, u64 *frame_time)
830 {
831 int retval;
832 struct es2_ap_dev *es2 = hd_to_es2(hd);
833 struct usb_device *udev = es2->usb_dev;
834 __le64 *response_frame_time;
835
836 response_frame_time = kzalloc(sizeof(*response_frame_time), GFP_KERNEL);
837 if (!response_frame_time)
838 return -ENOMEM;
839
840 retval = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
841 GB_APB_REQUEST_TIMESYNC_GET_LAST_EVENT,
842 USB_DIR_IN | USB_TYPE_VENDOR |
843 USB_RECIP_INTERFACE, 0, 0, response_frame_time,
844 sizeof(*response_frame_time),
845 ES2_USB_CTRL_TIMEOUT);
846
847 if (retval != sizeof(*response_frame_time)) {
848 dev_err(&udev->dev, "Cannot get last TimeSync event: %d\n",
849 retval);
850
851 if (retval >= 0)
852 retval = -EIO;
853
854 goto out;
855 }
856 *frame_time = le64_to_cpu(*response_frame_time);
857 retval = 0;
858 out:
859 kfree(response_frame_time);
860 return retval;
861 }
862
863 static struct gb_hd_driver es2_driver = {
864 .hd_priv_size = sizeof(struct es2_ap_dev),
865 .message_send = message_send,
866 .message_cancel = message_cancel,
867 .cport_allocate = es2_cport_allocate,
868 .cport_release = es2_cport_release,
869 .cport_enable = cport_enable,
870 .cport_connected = es2_cport_connected,
871 .cport_flush = es2_cport_flush,
872 .cport_shutdown = es2_cport_shutdown,
873 .cport_quiesce = es2_cport_quiesce,
874 .cport_clear = es2_cport_clear,
875 .latency_tag_enable = latency_tag_enable,
876 .latency_tag_disable = latency_tag_disable,
877 .output = output,
878 .timesync_enable = timesync_enable,
879 .timesync_disable = timesync_disable,
880 .timesync_authoritative = timesync_authoritative,
881 .timesync_get_last_event = timesync_get_last_event,
882 };
883
884 /* Common function to report consistent warnings based on URB status */
885 static int check_urb_status(struct urb *urb)
886 {
887 struct device *dev = &urb->dev->dev;
888 int status = urb->status;
889
890 switch (status) {
891 case 0:
892 return 0;
893
894 case -EOVERFLOW:
895 dev_err(dev, "%s: overflow actual length is %d\n",
896 __func__, urb->actual_length);
897 case -ECONNRESET:
898 case -ENOENT:
899 case -ESHUTDOWN:
900 case -EILSEQ:
901 case -EPROTO:
902 /* device is gone, stop sending */
903 return status;
904 }
905 dev_err(dev, "%s: unknown status %d\n", __func__, status);
906
907 return -EAGAIN;
908 }
909
910 static void es2_destroy(struct es2_ap_dev *es2)
911 {
912 struct usb_device *udev;
913 struct urb *urb;
914 int i;
915
916 debugfs_remove(es2->apb_log_enable_dentry);
917 usb_log_disable(es2);
918
919 /* Tear down everything! */
920 for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
921 urb = es2->cport_out_urb[i];
922 usb_kill_urb(urb);
923 usb_free_urb(urb);
924 es2->cport_out_urb[i] = NULL;
925 es2->cport_out_urb_busy[i] = false; /* just to be anal */
926 }
927
928 for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
929 usb_free_urb(es2->arpc_urb[i]);
930 kfree(es2->arpc_buffer[i]);
931 es2->arpc_buffer[i] = NULL;
932 }
933
934 for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
935 usb_free_urb(es2->cport_in.urb[i]);
936 kfree(es2->cport_in.buffer[i]);
937 es2->cport_in.buffer[i] = NULL;
938 }
939
940 /* release reserved CDSI0 and CDSI1 cports */
941 gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI1);
942 gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI0);
943
944 udev = es2->usb_dev;
945 gb_hd_put(es2->hd);
946
947 usb_put_dev(udev);
948 }
949
950 static void cport_in_callback(struct urb *urb)
951 {
952 struct gb_host_device *hd = urb->context;
953 struct device *dev = &urb->dev->dev;
954 struct gb_operation_msg_hdr *header;
955 int status = check_urb_status(urb);
956 int retval;
957 u16 cport_id;
958
959 if (status) {
960 if ((status == -EAGAIN) || (status == -EPROTO))
961 goto exit;
962
963 /* The urb is being unlinked */
964 if (status == -ENOENT || status == -ESHUTDOWN)
965 return;
966
967 dev_err(dev, "urb cport in error %d (dropped)\n", status);
968 return;
969 }
970
971 if (urb->actual_length < sizeof(*header)) {
972 dev_err(dev, "short message received\n");
973 goto exit;
974 }
975
976 /* Extract the CPort id, which is packed in the message header */
977 header = urb->transfer_buffer;
978 cport_id = gb_message_cport_unpack(header);
979
980 if (cport_id_valid(hd, cport_id)) {
981 greybus_data_rcvd(hd, cport_id, urb->transfer_buffer,
982 urb->actual_length);
983 } else {
984 dev_err(dev, "invalid cport id %u received\n", cport_id);
985 }
986 exit:
987 /* put our urb back in the request pool */
988 retval = usb_submit_urb(urb, GFP_ATOMIC);
989 if (retval)
990 dev_err(dev, "failed to resubmit in-urb: %d\n", retval);
991 }
992
993 static void cport_out_callback(struct urb *urb)
994 {
995 struct gb_message *message = urb->context;
996 struct gb_host_device *hd = message->operation->connection->hd;
997 struct es2_ap_dev *es2 = hd_to_es2(hd);
998 int status = check_urb_status(urb);
999 unsigned long flags;
1000
1001 gb_message_cport_clear(message->header);
1002
1003 spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
1004 message->hcpriv = NULL;
1005 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
1006
1007 /*
1008 * Tell the submitter that the message send (attempt) is
1009 * complete, and report the status.
1010 */
1011 greybus_message_sent(hd, message, status);
1012
1013 free_urb(es2, urb);
1014 }
1015
1016 static struct arpc *arpc_alloc(void *payload, u16 size, u8 type)
1017 {
1018 struct arpc *rpc;
1019
1020 if (size + sizeof(*rpc->req) > ARPC_OUT_SIZE_MAX)
1021 return NULL;
1022
1023 rpc = kzalloc(sizeof(*rpc), GFP_KERNEL);
1024 if (!rpc)
1025 return NULL;
1026
1027 INIT_LIST_HEAD(&rpc->list);
1028 rpc->req = kzalloc(sizeof(*rpc->req) + size, GFP_KERNEL);
1029 if (!rpc->req)
1030 goto err_free_rpc;
1031
1032 rpc->resp = kzalloc(sizeof(*rpc->resp), GFP_KERNEL);
1033 if (!rpc->resp)
1034 goto err_free_req;
1035
1036 rpc->req->type = type;
1037 rpc->req->size = cpu_to_le16(sizeof(rpc->req) + size);
1038 memcpy(rpc->req->data, payload, size);
1039
1040 init_completion(&rpc->response_received);
1041
1042 return rpc;
1043
1044 err_free_req:
1045 kfree(rpc->req);
1046 err_free_rpc:
1047 kfree(rpc);
1048
1049 return NULL;
1050 }
1051
1052 static void arpc_free(struct arpc *rpc)
1053 {
1054 kfree(rpc->req);
1055 kfree(rpc->resp);
1056 kfree(rpc);
1057 }
1058
1059 static struct arpc *arpc_find(struct es2_ap_dev *es2, __le16 id)
1060 {
1061 struct arpc *rpc;
1062
1063 list_for_each_entry(rpc, &es2->arpcs, list) {
1064 if (rpc->req->id == id)
1065 return rpc;
1066 }
1067
1068 return NULL;
1069 }
1070
1071 static void arpc_add(struct es2_ap_dev *es2, struct arpc *rpc)
1072 {
1073 rpc->active = true;
1074 rpc->req->id = cpu_to_le16(es2->arpc_id_cycle++);
1075 list_add_tail(&rpc->list, &es2->arpcs);
1076 }
1077
1078 static void arpc_del(struct es2_ap_dev *es2, struct arpc *rpc)
1079 {
1080 if (rpc->active) {
1081 rpc->active = false;
1082 list_del(&rpc->list);
1083 }
1084 }
1085
1086 static int arpc_send(struct es2_ap_dev *es2, struct arpc *rpc, int timeout)
1087 {
1088 struct usb_device *udev = es2->usb_dev;
1089 int retval;
1090
1091 retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1092 GB_APB_REQUEST_ARPC_RUN,
1093 USB_DIR_OUT | USB_TYPE_VENDOR |
1094 USB_RECIP_INTERFACE,
1095 0, 0,
1096 rpc->req, le16_to_cpu(rpc->req->size),
1097 ES2_USB_CTRL_TIMEOUT);
1098 if (retval != le16_to_cpu(rpc->req->size)) {
1099 dev_err(&udev->dev,
1100 "failed to send ARPC request %d: %d\n",
1101 rpc->req->type, retval);
1102 if (retval > 0)
1103 retval = -EIO;
1104 return retval;
1105 }
1106
1107 return 0;
1108 }
1109
1110 static int arpc_sync(struct es2_ap_dev *es2, u8 type, void *payload,
1111 size_t size, int *result, unsigned int timeout)
1112 {
1113 struct arpc *rpc;
1114 unsigned long flags;
1115 int retval;
1116
1117 if (result)
1118 *result = 0;
1119
1120 rpc = arpc_alloc(payload, size, type);
1121 if (!rpc)
1122 return -ENOMEM;
1123
1124 spin_lock_irqsave(&es2->arpc_lock, flags);
1125 arpc_add(es2, rpc);
1126 spin_unlock_irqrestore(&es2->arpc_lock, flags);
1127
1128 retval = arpc_send(es2, rpc, timeout);
1129 if (retval)
1130 goto out_arpc_del;
1131
1132 retval = wait_for_completion_interruptible_timeout(
1133 &rpc->response_received,
1134 msecs_to_jiffies(timeout));
1135 if (retval <= 0) {
1136 if (!retval)
1137 retval = -ETIMEDOUT;
1138 goto out_arpc_del;
1139 }
1140
1141 if (rpc->resp->result) {
1142 retval = -EREMOTEIO;
1143 if (result)
1144 *result = rpc->resp->result;
1145 } else {
1146 retval = 0;
1147 }
1148
1149 out_arpc_del:
1150 spin_lock_irqsave(&es2->arpc_lock, flags);
1151 arpc_del(es2, rpc);
1152 spin_unlock_irqrestore(&es2->arpc_lock, flags);
1153 arpc_free(rpc);
1154
1155 if (retval < 0 && retval != -EREMOTEIO) {
1156 dev_err(&es2->usb_dev->dev,
1157 "failed to execute ARPC: %d\n", retval);
1158 }
1159
1160 return retval;
1161 }
1162
1163 static void arpc_in_callback(struct urb *urb)
1164 {
1165 struct es2_ap_dev *es2 = urb->context;
1166 struct device *dev = &urb->dev->dev;
1167 int status = check_urb_status(urb);
1168 struct arpc *rpc;
1169 struct arpc_response_message *resp;
1170 unsigned long flags;
1171 int retval;
1172
1173 if (status) {
1174 if ((status == -EAGAIN) || (status == -EPROTO))
1175 goto exit;
1176
1177 /* The urb is being unlinked */
1178 if (status == -ENOENT || status == -ESHUTDOWN)
1179 return;
1180
1181 dev_err(dev, "arpc in-urb error %d (dropped)\n", status);
1182 return;
1183 }
1184
1185 if (urb->actual_length < sizeof(*resp)) {
1186 dev_err(dev, "short aprc response received\n");
1187 goto exit;
1188 }
1189
1190 resp = urb->transfer_buffer;
1191 spin_lock_irqsave(&es2->arpc_lock, flags);
1192 rpc = arpc_find(es2, resp->id);
1193 if (!rpc) {
1194 dev_err(dev, "invalid arpc response id received: %u\n",
1195 le16_to_cpu(resp->id));
1196 spin_unlock_irqrestore(&es2->arpc_lock, flags);
1197 goto exit;
1198 }
1199
1200 arpc_del(es2, rpc);
1201 memcpy(rpc->resp, resp, sizeof(*resp));
1202 complete(&rpc->response_received);
1203 spin_unlock_irqrestore(&es2->arpc_lock, flags);
1204
1205 exit:
1206 /* put our urb back in the request pool */
1207 retval = usb_submit_urb(urb, GFP_ATOMIC);
1208 if (retval)
1209 dev_err(dev, "failed to resubmit arpc in-urb: %d\n", retval);
1210 }
1211
1212 #define APB1_LOG_MSG_SIZE 64
1213 static void apb_log_get(struct es2_ap_dev *es2, char *buf)
1214 {
1215 int retval;
1216
1217 do {
1218 retval = usb_control_msg(es2->usb_dev,
1219 usb_rcvctrlpipe(es2->usb_dev, 0),
1220 GB_APB_REQUEST_LOG,
1221 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
1222 0x00, 0x00,
1223 buf,
1224 APB1_LOG_MSG_SIZE,
1225 ES2_USB_CTRL_TIMEOUT);
1226 if (retval > 0)
1227 kfifo_in(&es2->apb_log_fifo, buf, retval);
1228 } while (retval > 0);
1229 }
1230
1231 static int apb_log_poll(void *data)
1232 {
1233 struct es2_ap_dev *es2 = data;
1234 char *buf;
1235
1236 buf = kmalloc(APB1_LOG_MSG_SIZE, GFP_KERNEL);
1237 if (!buf)
1238 return -ENOMEM;
1239
1240 while (!kthread_should_stop()) {
1241 msleep(1000);
1242 apb_log_get(es2, buf);
1243 }
1244
1245 kfree(buf);
1246
1247 return 0;
1248 }
1249
1250 static ssize_t apb_log_read(struct file *f, char __user *buf,
1251 size_t count, loff_t *ppos)
1252 {
1253 struct es2_ap_dev *es2 = f->f_inode->i_private;
1254 ssize_t ret;
1255 size_t copied;
1256 char *tmp_buf;
1257
1258 if (count > APB1_LOG_SIZE)
1259 count = APB1_LOG_SIZE;
1260
1261 tmp_buf = kmalloc(count, GFP_KERNEL);
1262 if (!tmp_buf)
1263 return -ENOMEM;
1264
1265 copied = kfifo_out(&es2->apb_log_fifo, tmp_buf, count);
1266 ret = simple_read_from_buffer(buf, count, ppos, tmp_buf, copied);
1267
1268 kfree(tmp_buf);
1269
1270 return ret;
1271 }
1272
1273 static const struct file_operations apb_log_fops = {
1274 .read = apb_log_read,
1275 };
1276
1277 static void usb_log_enable(struct es2_ap_dev *es2)
1278 {
1279 if (!IS_ERR_OR_NULL(es2->apb_log_task))
1280 return;
1281
1282 /* get log from APB1 */
1283 es2->apb_log_task = kthread_run(apb_log_poll, es2, "apb_log");
1284 if (IS_ERR(es2->apb_log_task))
1285 return;
1286 /* XXX We will need to rename this per APB */
1287 es2->apb_log_dentry = debugfs_create_file("apb_log", S_IRUGO,
1288 gb_debugfs_get(), es2,
1289 &apb_log_fops);
1290 }
1291
1292 static void usb_log_disable(struct es2_ap_dev *es2)
1293 {
1294 if (IS_ERR_OR_NULL(es2->apb_log_task))
1295 return;
1296
1297 debugfs_remove(es2->apb_log_dentry);
1298 es2->apb_log_dentry = NULL;
1299
1300 kthread_stop(es2->apb_log_task);
1301 es2->apb_log_task = NULL;
1302 }
1303
1304 static ssize_t apb_log_enable_read(struct file *f, char __user *buf,
1305 size_t count, loff_t *ppos)
1306 {
1307 struct es2_ap_dev *es2 = f->f_inode->i_private;
1308 int enable = !IS_ERR_OR_NULL(es2->apb_log_task);
1309 char tmp_buf[3];
1310
1311 sprintf(tmp_buf, "%d\n", enable);
1312 return simple_read_from_buffer(buf, count, ppos, tmp_buf, 3);
1313 }
1314
1315 static ssize_t apb_log_enable_write(struct file *f, const char __user *buf,
1316 size_t count, loff_t *ppos)
1317 {
1318 int enable;
1319 ssize_t retval;
1320 struct es2_ap_dev *es2 = f->f_inode->i_private;
1321
1322 retval = kstrtoint_from_user(buf, count, 10, &enable);
1323 if (retval)
1324 return retval;
1325
1326 if (enable)
1327 usb_log_enable(es2);
1328 else
1329 usb_log_disable(es2);
1330
1331 return count;
1332 }
1333
1334 static const struct file_operations apb_log_enable_fops = {
1335 .read = apb_log_enable_read,
1336 .write = apb_log_enable_write,
1337 };
1338
1339 static int apb_get_cport_count(struct usb_device *udev)
1340 {
1341 int retval;
1342 __le16 *cport_count;
1343
1344 cport_count = kzalloc(sizeof(*cport_count), GFP_KERNEL);
1345 if (!cport_count)
1346 return -ENOMEM;
1347
1348 retval = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
1349 GB_APB_REQUEST_CPORT_COUNT,
1350 USB_DIR_IN | USB_TYPE_VENDOR |
1351 USB_RECIP_INTERFACE, 0, 0, cport_count,
1352 sizeof(*cport_count), ES2_USB_CTRL_TIMEOUT);
1353 if (retval != sizeof(*cport_count)) {
1354 dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n",
1355 retval);
1356
1357 if (retval >= 0)
1358 retval = -EIO;
1359
1360 goto out;
1361 }
1362
1363 retval = le16_to_cpu(*cport_count);
1364
1365 /* We need to fit a CPort ID in one byte of a message header */
1366 if (retval > U8_MAX) {
1367 retval = U8_MAX;
1368 dev_warn(&udev->dev, "Limiting number of CPorts to U8_MAX\n");
1369 }
1370
1371 out:
1372 kfree(cport_count);
1373 return retval;
1374 }
1375
1376 /*
1377 * The ES2 USB Bridge device has 15 endpoints
1378 * 1 Control - usual USB stuff + AP -> APBridgeA messages
1379 * 7 Bulk IN - CPort data in
1380 * 7 Bulk OUT - CPort data out
1381 */
1382 static int ap_probe(struct usb_interface *interface,
1383 const struct usb_device_id *id)
1384 {
1385 struct es2_ap_dev *es2;
1386 struct gb_host_device *hd;
1387 struct usb_device *udev;
1388 struct usb_host_interface *iface_desc;
1389 struct usb_endpoint_descriptor *endpoint;
1390 __u8 ep_addr;
1391 int retval;
1392 int i;
1393 int num_cports;
1394 bool bulk_out_found = false;
1395 bool bulk_in_found = false;
1396 bool arpc_in_found = false;
1397
1398 udev = usb_get_dev(interface_to_usbdev(interface));
1399
1400 num_cports = apb_get_cport_count(udev);
1401 if (num_cports < 0) {
1402 usb_put_dev(udev);
1403 dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n",
1404 num_cports);
1405 return num_cports;
1406 }
1407
1408 hd = gb_hd_create(&es2_driver, &udev->dev, ES2_GBUF_MSG_SIZE_MAX,
1409 num_cports);
1410 if (IS_ERR(hd)) {
1411 usb_put_dev(udev);
1412 return PTR_ERR(hd);
1413 }
1414
1415 es2 = hd_to_es2(hd);
1416 es2->hd = hd;
1417 es2->usb_intf = interface;
1418 es2->usb_dev = udev;
1419 spin_lock_init(&es2->cport_out_urb_lock);
1420 INIT_KFIFO(es2->apb_log_fifo);
1421 usb_set_intfdata(interface, es2);
1422
1423 /*
1424 * Reserve the CDSI0 and CDSI1 CPorts so they won't be allocated
1425 * dynamically.
1426 */
1427 retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI0);
1428 if (retval)
1429 goto error;
1430 retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI1);
1431 if (retval)
1432 goto error;
1433
1434 /* find all bulk endpoints */
1435 iface_desc = interface->cur_altsetting;
1436 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1437 endpoint = &iface_desc->endpoint[i].desc;
1438 ep_addr = endpoint->bEndpointAddress;
1439
1440 if (usb_endpoint_is_bulk_in(endpoint)) {
1441 if (!bulk_in_found) {
1442 es2->cport_in.endpoint = ep_addr;
1443 bulk_in_found = true;
1444 } else if (!arpc_in_found) {
1445 es2->arpc_endpoint_in = ep_addr;
1446 arpc_in_found = true;
1447 } else {
1448 dev_warn(&udev->dev,
1449 "Unused bulk IN endpoint found: 0x%02x\n",
1450 ep_addr);
1451 }
1452 continue;
1453 }
1454 if (usb_endpoint_is_bulk_out(endpoint)) {
1455 if (!bulk_out_found) {
1456 es2->cport_out_endpoint = ep_addr;
1457 bulk_out_found = true;
1458 } else {
1459 dev_warn(&udev->dev,
1460 "Unused bulk OUT endpoint found: 0x%02x\n",
1461 ep_addr);
1462 }
1463 continue;
1464 }
1465 dev_warn(&udev->dev,
1466 "Unknown endpoint type found, address 0x%02x\n",
1467 ep_addr);
1468 }
1469 if (!bulk_in_found || !arpc_in_found || !bulk_out_found) {
1470 dev_err(&udev->dev, "Not enough endpoints found in device, aborting!\n");
1471 retval = -ENODEV;
1472 goto error;
1473 }
1474
1475 /* Allocate buffers for our cport in messages */
1476 for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
1477 struct urb *urb;
1478 u8 *buffer;
1479
1480 urb = usb_alloc_urb(0, GFP_KERNEL);
1481 if (!urb) {
1482 retval = -ENOMEM;
1483 goto error;
1484 }
1485 es2->cport_in.urb[i] = urb;
1486
1487 buffer = kmalloc(ES2_GBUF_MSG_SIZE_MAX, GFP_KERNEL);
1488 if (!buffer) {
1489 retval = -ENOMEM;
1490 goto error;
1491 }
1492
1493 usb_fill_bulk_urb(urb, udev,
1494 usb_rcvbulkpipe(udev, es2->cport_in.endpoint),
1495 buffer, ES2_GBUF_MSG_SIZE_MAX,
1496 cport_in_callback, hd);
1497
1498 es2->cport_in.buffer[i] = buffer;
1499 }
1500
1501 /* Allocate buffers for ARPC in messages */
1502 for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
1503 struct urb *urb;
1504 u8 *buffer;
1505
1506 urb = usb_alloc_urb(0, GFP_KERNEL);
1507 if (!urb) {
1508 retval = -ENOMEM;
1509 goto error;
1510 }
1511 es2->arpc_urb[i] = urb;
1512
1513 buffer = kmalloc(ARPC_IN_SIZE_MAX, GFP_KERNEL);
1514 if (!buffer) {
1515 retval = -ENOMEM;
1516 goto error;
1517 }
1518
1519 usb_fill_bulk_urb(urb, udev,
1520 usb_rcvbulkpipe(udev,
1521 es2->arpc_endpoint_in),
1522 buffer, ARPC_IN_SIZE_MAX,
1523 arpc_in_callback, es2);
1524
1525 es2->arpc_buffer[i] = buffer;
1526 }
1527
1528 /* Allocate urbs for our CPort OUT messages */
1529 for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
1530 struct urb *urb;
1531
1532 urb = usb_alloc_urb(0, GFP_KERNEL);
1533 if (!urb) {
1534 retval = -ENOMEM;
1535 goto error;
1536 }
1537
1538 es2->cport_out_urb[i] = urb;
1539 es2->cport_out_urb_busy[i] = false; /* just to be anal */
1540 }
1541
1542 /* XXX We will need to rename this per APB */
1543 es2->apb_log_enable_dentry = debugfs_create_file("apb_log_enable",
1544 (S_IWUSR | S_IRUGO),
1545 gb_debugfs_get(), es2,
1546 &apb_log_enable_fops);
1547
1548 INIT_LIST_HEAD(&es2->arpcs);
1549 spin_lock_init(&es2->arpc_lock);
1550
1551 retval = es2_arpc_in_enable(es2);
1552 if (retval)
1553 goto error;
1554
1555 retval = gb_hd_add(hd);
1556 if (retval)
1557 goto err_disable_arpc_in;
1558
1559 retval = es2_cport_in_enable(es2, &es2->cport_in);
1560 if (retval)
1561 goto err_hd_del;
1562
1563 return 0;
1564
1565 err_hd_del:
1566 gb_hd_del(hd);
1567 err_disable_arpc_in:
1568 es2_arpc_in_disable(es2);
1569 error:
1570 es2_destroy(es2);
1571
1572 return retval;
1573 }
1574
1575 static void ap_disconnect(struct usb_interface *interface)
1576 {
1577 struct es2_ap_dev *es2 = usb_get_intfdata(interface);
1578
1579 gb_hd_del(es2->hd);
1580
1581 es2_cport_in_disable(es2, &es2->cport_in);
1582 es2_arpc_in_disable(es2);
1583
1584 es2_destroy(es2);
1585 }
1586
1587 static struct usb_driver es2_ap_driver = {
1588 .name = "es2_ap_driver",
1589 .probe = ap_probe,
1590 .disconnect = ap_disconnect,
1591 .id_table = id_table,
1592 .soft_unbind = 1,
1593 };
1594
1595 module_usb_driver(es2_ap_driver);
1596
1597 MODULE_LICENSE("GPL v2");
1598 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
Linux with added FPC-III support