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staging: most: simplify code
[deliverable/linux.git] / drivers / staging / most / hdm-usb / hdm_usb.c
CommitLineData
a4198cdf
CG		 1/*
2 * hdm_usb.c - Hardware dependent module for USB
3 *
4 * Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG
5 *
6 * This program is distributed in the hope that it will be useful,
7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9 * GNU General Public License for more details.
10 *
11 * This file is licensed under GPLv2.
12 */
13
14#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15#include <linux/module.h>
16#include <linux/fs.h>
17#include <linux/usb.h>
18#include <linux/slab.h>
19#include <linux/init.h>
20#include <linux/cdev.h>
21#include <linux/device.h>
22#include <linux/list.h>
23#include <linux/completion.h>
24#include <linux/mutex.h>
25#include <linux/spinlock.h>
26#include <linux/interrupt.h>
27#include <linux/workqueue.h>
28#include <linux/sysfs.h>
29#include <linux/dma-mapping.h>
30#include <linux/etherdevice.h>
31#include <linux/uaccess.h>
32#include "mostcore.h"
33#include "networking.h"
34
35#define USB_MTU 512
36#define NO_ISOCHRONOUS_URB 0
37#define AV_PACKETS_PER_XACT 2
38#define BUF_CHAIN_SIZE 0xFFFF
39#define MAX_NUM_ENDPOINTS 30
40#define MAX_SUFFIX_LEN 10
41#define MAX_STRING_LEN 80
42#define MAX_BUF_SIZE 0xFFFF
43#define CEILING(x, y) (((x) + (y) - 1) / (y))
44
45#define USB_VENDOR_ID_SMSC 0x0424 /* VID: SMSC */
46#define USB_DEV_ID_BRDG 0xC001 /* PID: USB Bridge */
47#define USB_DEV_ID_INIC 0xCF18 /* PID: USB INIC */
412c8232 48#define HW_RESYNC 0x0000
a4198cdf
CG		 49/* DRCI Addresses */
50#define DRCI_REG_NI_STATE 0x0100
51#define DRCI_REG_PACKET_BW 0x0101
52#define DRCI_REG_NODE_ADDR 0x0102
53#define DRCI_REG_NODE_POS 0x0103
54#define DRCI_REG_MEP_FILTER 0x0140
55#define DRCI_REG_HASH_TBL0 0x0141
56#define DRCI_REG_HASH_TBL1 0x0142
57#define DRCI_REG_HASH_TBL2 0x0143
58#define DRCI_REG_HASH_TBL3 0x0144
59#define DRCI_REG_HW_ADDR_HI 0x0145
60#define DRCI_REG_HW_ADDR_MI 0x0146
61#define DRCI_REG_HW_ADDR_LO 0x0147
d747e8ec
CG		 62#define DRCI_REG_BASE 0x1100
63#define DRCI_COMMAND 0x02
a4198cdf
CG		 64#define DRCI_READ_REQ 0xA0
65#define DRCI_WRITE_REQ 0xA1
66
67/**
68 * struct buf_anchor - used to create a list of pending URBs
69 * @urb: pointer to USB request block
70 * @clear_work_obj:
71 * @list: linked list
72 * @urb_completion:
73 */
74struct buf_anchor {
75 struct urb *urb;
76 struct work_struct clear_work_obj;
77 struct list_head list;
78 struct completion urb_compl;
79};
80#define to_buf_anchor(w) container_of(w, struct buf_anchor, clear_work_obj)
81
82/**
83 * struct most_dci_obj - Direct Communication Interface
84 * @kobj:position in sysfs
85 * @usb_device: pointer to the usb device
86 */
87struct most_dci_obj {
88 struct kobject kobj;
89 struct usb_device *usb_device;
90};
91#define to_dci_obj(p) container_of(p, struct most_dci_obj, kobj)
92
93/**
94 * struct most_dev - holds all usb interface specific stuff
95 * @parent: parent object in sysfs
96 * @usb_device: pointer to usb device
97 * @iface: hardware interface
98 * @cap: channel capabilities
99 * @conf: channel configuration
100 * @dci: direct communication interface of hardware
101 * @hw_addr: MAC address of hardware
102 * @ep_address: endpoint address table
103 * @link_stat: link status of hardware
104 * @description: device description
105 * @suffix: suffix for channel name
106 * @anchor_list_lock: locks list access
107 * @padding_active: indicates channel uses padding
108 * @is_channel_healthy: health status table of each channel
109 * @anchor_list: list of anchored items
110 * @io_mutex: synchronize I/O with disconnect
111 * @link_stat_timer: timer for link status reports
112 * @poll_work_obj: work for polling link status
113 */
114struct most_dev {
115 struct kobject *parent;
116 struct usb_device *usb_device;
117 struct most_interface iface;
118 struct most_channel_capability *cap;
119 struct most_channel_config *conf;
120 struct most_dci_obj *dci;
121 u8 hw_addr[6];
122 u8 *ep_address;
123 u16 link_stat;
124 char description[MAX_STRING_LEN];
125 char suffix[MAX_NUM_ENDPOINTS][MAX_SUFFIX_LEN];
126 spinlock_t anchor_list_lock[MAX_NUM_ENDPOINTS];
127 bool padding_active[MAX_NUM_ENDPOINTS];
128 bool is_channel_healthy[MAX_NUM_ENDPOINTS];
129 struct list_head *anchor_list;
130 struct mutex io_mutex;
131 struct timer_list link_stat_timer;
132 struct work_struct poll_work_obj;
133};
134#define to_mdev(d) container_of(d, struct most_dev, iface)
135#define to_mdev_from_work(w) container_of(w, struct most_dev, poll_work_obj)
136
137static struct workqueue_struct *schedule_usb_work;
138static void wq_clear_halt(struct work_struct *wq_obj);
139static void wq_netinfo(struct work_struct *wq_obj);
140
a4198cdf
CG		 141/**
142 * drci_rd_reg - read a DCI register
143 * @dev: usb device
144 * @reg: register address
145 * @buf: buffer to store data
146 *
147 * This is reads data from INIC's direct register communication interface
148 */
149static inline int drci_rd_reg(struct usb_device *dev, u16 reg, void *buf)
150{
151 return usb_control_msg(dev,
152 usb_rcvctrlpipe(dev, 0),
153 DRCI_READ_REQ,
154 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
155 0x0000,
156 reg,
157 buf,
158 2,
159 5 * HZ);
160}
161
162/**
163 * drci_wr_reg - write a DCI register
164 * @dev: usb device
165 * @reg: register address
166 * @data: data to write
167 *
168 * This is writes data to INIC's direct register communication interface
169 */
170static inline int drci_wr_reg(struct usb_device *dev, u16 reg, u16 data)
171{
172 return usb_control_msg(dev,
173 usb_sndctrlpipe(dev, 0),
174 DRCI_WRITE_REQ,
175 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
176 data,
177 reg,
178 NULL,
179 0,
180 5 * HZ);
181}
182
183/**
184 * free_anchored_buffers - free device's anchored items
185 * @mdev: the device
186 * @channel: channel ID
187 */
188static void free_anchored_buffers(struct most_dev *mdev, unsigned int channel)
189{
190 struct mbo *mbo;
191 struct buf_anchor *anchor, *tmp;
192 unsigned long flags;
193
194 spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
195 list_for_each_entry_safe(anchor, tmp, &mdev->anchor_list[channel], list) {
196 struct urb *urb = anchor->urb;
197
198 spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
199 if (likely(urb)) {
200 mbo = urb->context;
201 if (!irqs_disabled()) {
202 usb_kill_urb(urb);
203 } else {
204 usb_unlink_urb(urb);
205 wait_for_completion(&anchor->urb_compl);
206 }
207 if ((mbo) && (mbo->complete)) {
208 mbo->status = MBO_E_CLOSE;
209 mbo->processed_length = 0;
210 mbo->complete(mbo);
211 }
212 usb_free_urb(urb);
213 }
214 spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
215 list_del(&anchor->list);
216 kfree(anchor);
217 }
218 spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
219}
220
221/**
222 * get_stream_frame_size - calculate frame size of current configuration
223 * @cfg: channel configuration
224 */
225static unsigned int get_stream_frame_size(struct most_channel_config *cfg)
226{
227 unsigned int frame_size = 0;
228 unsigned int sub_size = cfg->subbuffer_size;
229
230 if (!sub_size) {
59ed0480 231 pr_warn("Misconfig: Subbuffer size zero.\n");
a4198cdf
CG		 232 return frame_size;
233 }
234 switch (cfg->data_type) {
235 case MOST_CH_ISOC_AVP:
236 frame_size = AV_PACKETS_PER_XACT * sub_size;
237 break;
238 case MOST_CH_SYNC:
239 if (cfg->packets_per_xact == 0) {
59ed0480 240 pr_warn("Misconfig: Packets per XACT zero\n");
a4198cdf
CG		 241 frame_size = 0;
242 } else if (cfg->packets_per_xact == 0xFF)
243 frame_size = (USB_MTU / sub_size) * sub_size;
244 else
245 frame_size = cfg->packets_per_xact * sub_size;
246 break;
247 default:
248 pr_warn("Query frame size of non-streaming channel\n");
249 break;
250 }
251 return frame_size;
252}
253
254/**
255 * hdm_poison_channel - mark buffers of this channel as invalid
256 * @iface: pointer to the interface
257 * @channel: channel ID
258 *
259 * This unlinks all URBs submitted to the HCD,
260 * calls the associated completion function of the core and removes
261 * them from the list.
262 *
263 * Returns 0 on success or error code otherwise.
264 */
23fe15fa 265static int hdm_poison_channel(struct most_interface *iface, int channel)
a4198cdf
CG		 266{
267 struct most_dev *mdev;
268
59ed0480 269 mdev = to_mdev(iface);
a4198cdf 270 if (unlikely(!iface)) {
59ed0480 271 dev_warn(&mdev->usb_device->dev, "Poison: Bad interface.\n");
a4198cdf
CG		 272 return -EIO;
273 }
274 if (unlikely((channel < 0) || (channel >= iface->num_channels))) {
59ed0480 275 dev_warn(&mdev->usb_device->dev, "Channel ID out of range.\n");
a4198cdf
CG		 276 return -ECHRNG;
277 }
278
a4198cdf
CG		 279 mdev->is_channel_healthy[channel] = false;
280
281 mutex_lock(&mdev->io_mutex);
282 free_anchored_buffers(mdev, channel);
ec58d2a8 283 if (mdev->padding_active[channel])
a4198cdf
CG		 284 mdev->padding_active[channel] = false;
285
286 if (mdev->conf[channel].data_type == MOST_CH_ASYNC) {
287 del_timer_sync(&mdev->link_stat_timer);
288 cancel_work_sync(&mdev->poll_work_obj);
289 }
290 mutex_unlock(&mdev->io_mutex);
291 return 0;
292}
293
294/**
295 * hdm_add_padding - add padding bytes
296 * @mdev: most device
297 * @channel: channel ID
298 * @mbo: buffer object
299 *
300 * This inserts the INIC hardware specific padding bytes into a streaming
301 * channel's buffer
302 */
23fe15fa 303static int hdm_add_padding(struct most_dev *mdev, int channel, struct mbo *mbo)
a4198cdf
CG		 304{
305 struct most_channel_config *conf = &mdev->conf[channel];
306 unsigned int j, num_frames, frame_size;
307 u16 rd_addr, wr_addr;
308
309 frame_size = get_stream_frame_size(conf);
310 if (!frame_size)
311 return -EIO;
312 num_frames = mbo->buffer_length / frame_size;
313
314 if (num_frames < 1) {
59ed0480
CG		 315 dev_err(&mdev->usb_device->dev,
316 "Missed minimal transfer unit.\n");
a4198cdf
CG		 317 return -EIO;
318 }
319
320 for (j = 1; j < num_frames; j++) {
321 wr_addr = (num_frames - j) * USB_MTU;
322 rd_addr = (num_frames - j) * frame_size;
323 memmove(mbo->virt_address + wr_addr,
324 mbo->virt_address + rd_addr,
325 frame_size);
326 }
327 mbo->buffer_length = num_frames * USB_MTU;
328 return 0;
329}
330
331/**
332 * hdm_remove_padding - remove padding bytes
333 * @mdev: most device
334 * @channel: channel ID
335 * @mbo: buffer object
336 *
337 * This takes the INIC hardware specific padding bytes off a streaming
338 * channel's buffer.
339 */
23fe15fa 340static int hdm_remove_padding(struct most_dev *mdev, int channel, struct mbo *mbo)
a4198cdf
CG		 341{
342 unsigned int j, num_frames, frame_size;
343 struct most_channel_config *const conf = &mdev->conf[channel];
344
345 frame_size = get_stream_frame_size(conf);
346 if (!frame_size)
347 return -EIO;
348 num_frames = mbo->processed_length / USB_MTU;
349
350 for (j = 1; j < num_frames; j++)
351 memmove(mbo->virt_address + frame_size * j,
352 mbo->virt_address + USB_MTU * j,
353 frame_size);
354
355 mbo->processed_length = frame_size * num_frames;
356 return 0;
357}
358
359/**
360 * hdm_write_completion - completion function for submitted Tx URBs
361 * @urb: the URB that has been completed
362 *
363 * This checks the status of the completed URB. In case the URB has been
364 * unlinked before, it is immediately freed. On any other error the MBO
365 * transfer flag is set. On success it frees allocated resources and calls
366 * the completion function.
367 *
368 * Context: interrupt!
369 */
370static void hdm_write_completion(struct urb *urb)
371{
372 struct mbo *mbo;
373 struct buf_anchor *anchor;
374 struct most_dev *mdev;
59ed0480 375 struct device *dev;
a4198cdf
CG		 376 unsigned int channel;
377 unsigned long flags;
378
379 mbo = urb->context;
380 anchor = mbo->priv;
381 mdev = to_mdev(mbo->ifp);
382 channel = mbo->hdm_channel_id;
59ed0480 383 dev = &mdev->usb_device->dev;
a4198cdf
CG		 384
385 if ((urb->status == -ENOENT) || (urb->status == -ECONNRESET) ||
ec58d2a8 386 (!mdev->is_channel_healthy[channel])) {
a4198cdf
CG		 387 complete(&anchor->urb_compl);
388 return;
389 }
390
391 if (unlikely(urb->status && !(urb->status == -ENOENT ||
392 urb->status == -ECONNRESET ||
393 urb->status == -ESHUTDOWN))) {
394 mbo->processed_length = 0;
395 switch (urb->status) {
396 case -EPIPE:
59ed0480 397 dev_warn(dev, "Broken OUT pipe detected\n");
a4198cdf
CG		 398 most_stop_enqueue(&mdev->iface, channel);
399 mbo->status = MBO_E_INVAL;
400 usb_unlink_urb(urb);
401 INIT_WORK(&anchor->clear_work_obj, wq_clear_halt);
402 queue_work(schedule_usb_work, &anchor->clear_work_obj);
403 return;
404 case -ENODEV:
405 case -EPROTO:
406 mbo->status = MBO_E_CLOSE;
407 break;
408 default:
409 mbo->status = MBO_E_INVAL;
410 break;
411 }
412 } else {
413 mbo->status = MBO_SUCCESS;
414 mbo->processed_length = urb->actual_length;
415 }
416
417 spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
418 list_del(&anchor->list);
419 spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
420 kfree(anchor);
421
422 if (likely(mbo->complete))
423 mbo->complete(mbo);
424 usb_free_urb(urb);
425}
426
427/**
428 * hdm_read_completion - completion funciton for submitted Rx URBs
429 * @urb: the URB that has been completed
430 *
431 * This checks the status of the completed URB. In case the URB has been
432 * unlinked before it is immediately freed. On any other error the MBO transfer
433 * flag is set. On success it frees allocated resources, removes
434 * padding bytes -if necessary- and calls the completion function.
435 *
436 * Context: interrupt!
437 *
438 * **************************************************************************
439 * Error codes returned by in urb->status
440 * or in iso_frame_desc[n].status (for ISO)
441 * *************************************************************************
442 *
443 * USB device drivers may only test urb status values in completion handlers.
444 * This is because otherwise there would be a race between HCDs updating
445 * these values on one CPU, and device drivers testing them on another CPU.
446 *
447 * A transfer's actual_length may be positive even when an error has been
448 * reported. That's because transfers often involve several packets, so that
449 * one or more packets could finish before an error stops further endpoint I/O.
450 *
451 * For isochronous URBs, the urb status value is non-zero only if the URB is
452 * unlinked, the device is removed, the host controller is disabled or the total
453 * transferred length is less than the requested length and the URB_SHORT_NOT_OK
454 * flag is set. Completion handlers for isochronous URBs should only see
455 * urb->status set to zero, -ENOENT, -ECONNRESET, -ESHUTDOWN, or -EREMOTEIO.
456 * Individual frame descriptor status fields may report more status codes.
457 *
458 *
459 * 0 Transfer completed successfully
460 *
461 * -ENOENT URB was synchronously unlinked by usb_unlink_urb
462 *
463 * -EINPROGRESS URB still pending, no results yet
464 * (That is, if drivers see this it's a bug.)
465 *
466 * -EPROTO (*, **) a) bitstuff error
467 * b) no response packet received within the
468 * prescribed bus turn-around time
469 * c) unknown USB error
470 *
471 * -EILSEQ (*, **) a) CRC mismatch
472 * b) no response packet received within the
473 * prescribed bus turn-around time
474 * c) unknown USB error
475 *
476 * Note that often the controller hardware does not
477 * distinguish among cases a), b), and c), so a
478 * driver cannot tell whether there was a protocol
479 * error, a failure to respond (often caused by
480 * device disconnect), or some other fault.
481 *
482 * -ETIME (**) No response packet received within the prescribed
483 * bus turn-around time. This error may instead be
484 * reported as -EPROTO or -EILSEQ.
485 *
486 * -ETIMEDOUT Synchronous USB message functions use this code
487 * to indicate timeout expired before the transfer
488 * completed, and no other error was reported by HC.
489 *
490 * -EPIPE (**) Endpoint stalled. For non-control endpoints,
491 * reset this status with usb_clear_halt().
492 *
493 * -ECOMM During an IN transfer, the host controller
494 * received data from an endpoint faster than it
495 * could be written to system memory
496 *
497 * -ENOSR During an OUT transfer, the host controller
498 * could not retrieve data from system memory fast
499 * enough to keep up with the USB data rate
500 *
501 * -EOVERFLOW (*) The amount of data returned by the endpoint was
502 * greater than either the max packet size of the
503 * endpoint or the remaining buffer size. "Babble".
504 *
505 * -EREMOTEIO The data read from the endpoint did not fill the
506 * specified buffer, and URB_SHORT_NOT_OK was set in
507 * urb->transfer_flags.
508 *
509 * -ENODEV Device was removed. Often preceded by a burst of
510 * other errors, since the hub driver doesn't detect
511 * device removal events immediately.
512 *
513 * -EXDEV ISO transfer only partially completed
514 * (only set in iso_frame_desc[n].status, not urb->status)
515 *
516 * -EINVAL ISO madness, if this happens: Log off and go home
517 *
518 * -ECONNRESET URB was asynchronously unlinked by usb_unlink_urb
519 *
520 * -ESHUTDOWN The device or host controller has been disabled due
521 * to some problem that could not be worked around,
522 * such as a physical disconnect.
523 *
524 *
525 * (*) Error codes like -EPROTO, -EILSEQ and -EOVERFLOW normally indicate
526 * hardware problems such as bad devices (including firmware) or cables.
527 *
528 * (**) This is also one of several codes that different kinds of host
529 * controller use to indicate a transfer has failed because of device
530 * disconnect. In the interval before the hub driver starts disconnect
531 * processing, devices may receive such fault reports for every request.
532 *
533 * See <https://www.kernel.org/doc/Documentation/usb/error-codes.txt>
534 */
535static void hdm_read_completion(struct urb *urb)
536{
537 struct mbo *mbo;
538 struct buf_anchor *anchor;
539 struct most_dev *mdev;
59ed0480 540 struct device *dev;
a4198cdf
CG		 541 unsigned long flags;
542 unsigned int channel;
a4198cdf
CG		 543
544 mbo = urb->context;
545 anchor = mbo->priv;
546 mdev = to_mdev(mbo->ifp);
547 channel = mbo->hdm_channel_id;
59ed0480 548 dev = &mdev->usb_device->dev;
a4198cdf
CG		 549
550 if ((urb->status == -ENOENT) || (urb->status == -ECONNRESET) ||
ec58d2a8 551 (!mdev->is_channel_healthy[channel])) {
a4198cdf
CG		 552 complete(&anchor->urb_compl);
553 return;
554 }
555
a4198cdf
CG		 556 if (unlikely(urb->status && !(urb->status == -ENOENT ||
557 urb->status == -ECONNRESET ||
558 urb->status == -ESHUTDOWN))) {
559 mbo->processed_length = 0;
560 switch (urb->status) {
561 case -EPIPE:
59ed0480 562 dev_warn(dev, "Broken IN pipe detected\n");
a4198cdf
CG		 563 mbo->status = MBO_E_INVAL;
564 usb_unlink_urb(urb);
565 INIT_WORK(&anchor->clear_work_obj, wq_clear_halt);
566 queue_work(schedule_usb_work, &anchor->clear_work_obj);
567 return;
568 case -ENODEV:
569 case -EPROTO:
570 mbo->status = MBO_E_CLOSE;
571 break;
572 case -EOVERFLOW:
59ed0480 573 dev_warn(dev, "Babble on IN pipe detected\n");
a4198cdf
CG		 574 default:
575 mbo->status = MBO_E_INVAL;
576 break;
577 }
578 } else {
579 mbo->processed_length = urb->actual_length;
ec58d2a8 580 if (!mdev->padding_active[channel]) {
a4198cdf
CG		 581 mbo->status = MBO_SUCCESS;
582 } else {
583 if (hdm_remove_padding(mdev, channel, mbo)) {
584 mbo->processed_length = 0;
585 mbo->status = MBO_E_INVAL;
586 } else {
587 mbo->status = MBO_SUCCESS;
588 }
589 }
590 }
591 spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
592 list_del(&anchor->list);
593 spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
594 kfree(anchor);
595
596 if (likely(mbo->complete))
597 mbo->complete(mbo);
598 usb_free_urb(urb);
599}
600
601/**
602 * hdm_enqueue - receive a buffer to be used for data transfer
603 * @iface: interface to enqueue to
604 * @channel: ID of the channel
605 * @mbo: pointer to the buffer object
606 *
607 * This allocates a new URB and fills it according to the channel
608 * that is being used for transmission of data. Before the URB is
609 * submitted it is stored in the private anchor list.
610 *
611 * Returns 0 on success. On any error the URB is freed and a error code
612 * is returned.
613 *
614 * Context: Could in _some_ cases be interrupt!
615 */
23fe15fa 616static int hdm_enqueue(struct most_interface *iface, int channel, struct mbo *mbo)
a4198cdf
CG		 617{
618 struct most_dev *mdev;
619 struct buf_anchor *anchor;
620 struct most_channel_config *conf;
59ed0480 621 struct device *dev;
a4198cdf
CG		 622 int retval = 0;
623 struct urb *urb;
624 unsigned long flags;
625 unsigned long length;
626 void *virt_address;
627
59ed0480 628 if (unlikely(!iface || !mbo))
a4198cdf 629 return -EIO;
59ed0480 630 if (unlikely(iface->num_channels <= channel) || (channel < 0))
a4198cdf 631 return -ECHRNG;
a4198cdf
CG		 632
633 mdev = to_mdev(iface);
634 conf = &mdev->conf[channel];
59ed0480 635 dev = &mdev->usb_device->dev;
a4198cdf
CG		 636
637 if (!mdev->usb_device)
638 return -ENODEV;
639
640 urb = usb_alloc_urb(NO_ISOCHRONOUS_URB, GFP_ATOMIC);
641 if (!urb) {
59ed0480 642 dev_err(dev, "Failed to allocate URB\n");
a4198cdf
CG		 643 return -ENOMEM;
644 }
645
646 anchor = kzalloc(sizeof(*anchor), GFP_ATOMIC);
647 if (!anchor) {
648 retval = -ENOMEM;
649 goto _error;
650 }
651
652 anchor->urb = urb;
653 init_completion(&anchor->urb_compl);
654 mbo->priv = anchor;
655
656 spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
657 list_add_tail(&anchor->list, &mdev->anchor_list[channel]);
658 spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
659
ec58d2a8 660 if ((mdev->padding_active[channel]) &&
a4198cdf
CG		 661 (conf->direction & MOST_CH_TX))
662 if (hdm_add_padding(mdev, channel, mbo)) {
663 retval = -EIO;
664 goto _error_1;
665 }
666
667 urb->transfer_dma = mbo->bus_address;
668 virt_address = mbo->virt_address;
669 length = mbo->buffer_length;
670
671 if (conf->direction & MOST_CH_TX) {
672 usb_fill_bulk_urb(urb, mdev->usb_device,
673 usb_sndbulkpipe(mdev->usb_device,
674 mdev->ep_address[channel]),
675 virt_address,
676 length,
677 hdm_write_completion,
678 mbo);
679 if (conf->data_type != MOST_CH_ISOC_AVP)
680 urb->transfer_flags |= URB_ZERO_PACKET;
681 } else {
682 usb_fill_bulk_urb(urb, mdev->usb_device,
683 usb_rcvbulkpipe(mdev->usb_device,
684 mdev->ep_address[channel]),
685 virt_address,
9161e931 686 length + conf->extra_len,
a4198cdf
CG		 687 hdm_read_completion,
688 mbo);
689 }
690 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
691
692 retval = usb_submit_urb(urb, GFP_KERNEL);
693 if (retval) {
59ed0480 694 dev_err(dev, "URB submit failed with error %d.\n", retval);
a4198cdf
CG		 695 goto _error_1;
696 }
697 return 0;
698
699_error_1:
700 spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
701 list_del(&anchor->list);
702 spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
703 kfree(anchor);
704_error:
705 usb_free_urb(urb);
706 return retval;
707}
708
709/**
710 * hdm_configure_channel - receive channel configuration from core
711 * @iface: interface
712 * @channel: channel ID
713 * @conf: structure that holds the configuration information
714 */
23fe15fa
AR		 715static int hdm_configure_channel(struct most_interface *iface, int channel,
716 struct most_channel_config *conf)
a4198cdf
CG		 717{
718 unsigned int num_frames;
719 unsigned int frame_size;
720 unsigned int temp_size;
721 unsigned int tail_space;
722 struct most_dev *mdev;
59ed0480
CG		 723 struct device *dev;
724
725 mdev = to_mdev(iface);
726 mdev->is_channel_healthy[channel] = true;
727 dev = &mdev->usb_device->dev;
a4198cdf
CG		 728
729 if (unlikely(!iface || !conf)) {
59ed0480 730 dev_err(dev, "Bad interface or config pointer.\n");
a4198cdf
CG		 731 return -EINVAL;
732 }
733 if (unlikely((channel < 0) || (channel >= iface->num_channels))) {
59ed0480 734 dev_err(dev, "Channel ID out of range.\n");
a4198cdf
CG		 735 return -EINVAL;
736 }
737 if ((!conf->num_buffers) || (!conf->buffer_size)) {
59ed0480 738 dev_err(dev, "Misconfig: buffer size or #buffers zero.\n");
a4198cdf
CG		 739 return -EINVAL;
740 }
741
a4198cdf
CG		 742 if (!(conf->data_type == MOST_CH_SYNC) &&
743 !((conf->data_type == MOST_CH_ISOC_AVP) &&
744 (conf->packets_per_xact != 0xFF))) {
745 mdev->padding_active[channel] = false;
746 goto exit;
747 }
748
749 mdev->padding_active[channel] = true;
750 temp_size = conf->buffer_size;
751
a4198cdf
CG		 752 frame_size = get_stream_frame_size(conf);
753 if ((frame_size == 0) || (frame_size > USB_MTU)) {
59ed0480 754 dev_warn(dev, "Misconfig: frame size wrong\n");
a4198cdf
CG		 755 return -EINVAL;
756 }
757
758 if (conf->buffer_size % frame_size) {
759 u16 tmp_val;
760
761 tmp_val = conf->buffer_size / frame_size;
762 conf->buffer_size = tmp_val * frame_size;
59ed0480
CG		 763 dev_notice(dev,
764 "Channel %d - rouding buffer size to %d bytes, "
765 "channel config says %d bytes\n",
766 channel,
767 conf->buffer_size,
768 temp_size);
a4198cdf
CG		 769 }
770
771 num_frames = conf->buffer_size / frame_size;
772 tail_space = num_frames * (USB_MTU - frame_size);
773 temp_size += tail_space;
774
775 /* calculate extra length to comply w/ HW padding */
776 conf->extra_len = (CEILING(temp_size, USB_MTU) * USB_MTU)
777 - conf->buffer_size;
778exit:
779 mdev->conf[channel] = *conf;
780 return 0;
781}
782
783/**
784 * hdm_update_netinfo - retrieve latest networking information
785 * @mdev: device interface
786 *
787 * This triggers the USB vendor requests to read the hardware address and
788 * the current link status of the attached device.
789 */
23fe15fa 790static int hdm_update_netinfo(struct most_dev *mdev)
a4198cdf 791{
cc8d9935
CG		 792 struct usb_device *usb_device = mdev->usb_device;
793 struct device *dev = &usb_device->dev;
1ea7e502 794 u16 hi, mi, lo, link;
a4198cdf
CG		 795
796 if (!is_valid_ether_addr(mdev->hw_addr)) {
cc8d9935 797 if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_HI, &hi) < 0) {
59ed0480 798 dev_err(dev, "Vendor request \"hw_addr_hi\" failed\n");
a4198cdf
CG		 799 return -1;
800 }
1ea7e502
CG		 801 le16_to_cpus(&hi);
802
cc8d9935 803 if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_MI, &mi) < 0) {
59ed0480 804 dev_err(dev, "Vendor request \"hw_addr_mid\" failed\n");
a4198cdf
CG		 805 return -1;
806 }
1ea7e502
CG		 807 le16_to_cpus(&mi);
808
cc8d9935 809 if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_LO, &lo) < 0) {
59ed0480 810 dev_err(dev, "Vendor request \"hw_addr_low\" failed\n");
a4198cdf
CG		 811 return -1;
812 }
1ea7e502
CG		 813 le16_to_cpus(&lo);
814
a4198cdf 815 mutex_lock(&mdev->io_mutex);
1ea7e502
CG		 816 mdev->hw_addr[0] = hi >> 8;
817 mdev->hw_addr[1] = hi;
818 mdev->hw_addr[2] = mi >> 8;
819 mdev->hw_addr[3] = mi;
820 mdev->hw_addr[4] = lo >> 8;
821 mdev->hw_addr[5] = lo;
a4198cdf 822 mutex_unlock(&mdev->io_mutex);
a4198cdf 823 }
cc8d9935
CG		 824
825 if (drci_rd_reg(usb_device, DRCI_REG_NI_STATE, &link) < 0) {
59ed0480 826 dev_err(dev, "Vendor request \"link status\" failed\n");
a4198cdf
CG		 827 return -1;
828 }
829 le16_to_cpus(&link);
cc8d9935 830
a4198cdf
CG		 831 mutex_lock(&mdev->io_mutex);
832 mdev->link_stat = link;
833 mutex_unlock(&mdev->io_mutex);
834 return 0;
835}
836
837/**
838 * hdm_request_netinfo - request network information
839 * @iface: pointer to interface
840 * @channel: channel ID
841 *
842 * This is used as trigger to set up the link status timer that
843 * polls for the NI state of the INIC every 2 seconds.
844 *
845 */
23fe15fa 846static void hdm_request_netinfo(struct most_interface *iface, int channel)
a4198cdf
CG		 847{
848 struct most_dev *mdev;
849
850 BUG_ON(!iface);
851 mdev = to_mdev(iface);
852 mdev->link_stat_timer.expires = jiffies + HZ;
853 mod_timer(&mdev->link_stat_timer, mdev->link_stat_timer.expires);
854}
855
856/**
857 * link_stat_timer_handler - add work to link_stat work queue
858 * @data: pointer to USB device instance
859 *
860 * The handler runs in interrupt context. That's why we need to defer the
861 * tasks to a work queue.
862 */
863static void link_stat_timer_handler(unsigned long data)
864{
865 struct most_dev *mdev = (struct most_dev *)data;
866
867 queue_work(schedule_usb_work, &mdev->poll_work_obj);
868 mdev->link_stat_timer.expires = jiffies + (2 * HZ);
869 add_timer(&mdev->link_stat_timer);
870}
871
872/**
873 * wq_netinfo - work queue function
874 * @wq_obj: object that holds data for our deferred work to do
875 *
876 * This retrieves the network interface status of the USB INIC
877 * and compares it with the current status. If the status has
878 * changed, it updates the status of the core.
879 */
880static void wq_netinfo(struct work_struct *wq_obj)
881{
882 struct most_dev *mdev;
883 int i, prev_link_stat;
884 u8 prev_hw_addr[6];
885
886 mdev = to_mdev_from_work(wq_obj);
887 prev_link_stat = mdev->link_stat;
888
889 for (i = 0; i < 6; i++)
890 prev_hw_addr[i] = mdev->hw_addr[i];
891
892 if (0 > hdm_update_netinfo(mdev))
893 return;
894 if ((prev_link_stat != mdev->link_stat) ||
895 (prev_hw_addr[0] != mdev->hw_addr[0]) ||
896 (prev_hw_addr[1] != mdev->hw_addr[1]) ||
897 (prev_hw_addr[2] != mdev->hw_addr[2]) ||
898 (prev_hw_addr[3] != mdev->hw_addr[3]) ||
899 (prev_hw_addr[4] != mdev->hw_addr[4]) ||
900 (prev_hw_addr[5] != mdev->hw_addr[5]))
901 most_deliver_netinfo(&mdev->iface, mdev->link_stat,
902 &mdev->hw_addr[0]);
903}
904
905/**
906 * wq_clear_halt - work queue function
907 * @wq_obj: work_struct object to execute
908 *
909 * This sends a clear_halt to the given USB pipe.
910 */
911static void wq_clear_halt(struct work_struct *wq_obj)
912{
913 struct buf_anchor *anchor;
914 struct most_dev *mdev;
915 struct mbo *mbo;
916 struct urb *urb;
917 unsigned int channel;
918 unsigned long flags;
919
920 anchor = to_buf_anchor(wq_obj);
921 urb = anchor->urb;
922 mbo = urb->context;
923 mdev = to_mdev(mbo->ifp);
924 channel = mbo->hdm_channel_id;
925
926 if (usb_clear_halt(urb->dev, urb->pipe))
59ed0480 927 dev_warn(&mdev->usb_device->dev, "Failed to reset endpoint.\n");
a4198cdf
CG		 928
929 usb_free_urb(urb);
930 spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
931 list_del(&anchor->list);
932 spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
933
934 if (likely(mbo->complete))
935 mbo->complete(mbo);
936 if (mdev->conf[channel].direction & MOST_CH_TX)
937 most_resume_enqueue(&mdev->iface, channel);
938
939 kfree(anchor);
940}
941
942/**
943 * hdm_usb_fops - file operation table for USB driver
944 */
945static const struct file_operations hdm_usb_fops = {
946 .owner = THIS_MODULE,
947};
948
949/**
950 * usb_device_id - ID table for HCD device probing
951 */
952static struct usb_device_id usbid[] = {
953 { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_BRDG), },
954 { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_INIC), },
955 { } /* Terminating entry */
956};
957
958#define MOST_DCI_RO_ATTR(_name) \
959 struct most_dci_attribute most_dci_attr_##_name = \
960 __ATTR(_name, S_IRUGO, show_value, NULL)
961
962#define MOST_DCI_ATTR(_name) \
963 struct most_dci_attribute most_dci_attr_##_name = \
964 __ATTR(_name, S_IRUGO | S_IWUSR, show_value, store_value)
965
966/**
967 * struct most_dci_attribute - to access the attributes of a dci object
968 * @attr: attributes of a dci object
969 * @show: pointer to the show function
970 * @store: pointer to the store function
971 */
972struct most_dci_attribute {
973 struct attribute attr;
974 ssize_t (*show)(struct most_dci_obj *d,
975 struct most_dci_attribute *attr,
976 char *buf);
977 ssize_t (*store)(struct most_dci_obj *d,
978 struct most_dci_attribute *attr,
979 const char *buf,
980 size_t count);
981};
982#define to_dci_attr(a) container_of(a, struct most_dci_attribute, attr)
983
984
985/**
986 * dci_attr_show - show function for dci object
987 * @kobj: pointer to kobject
988 * @attr: pointer to attribute struct
989 * @buf: buffer
990 */
991static ssize_t dci_attr_show(struct kobject *kobj, struct attribute *attr,
992 char *buf)
993{
994 struct most_dci_attribute *dci_attr = to_dci_attr(attr);
995 struct most_dci_obj *dci_obj = to_dci_obj(kobj);
996
997 if (!dci_attr->show)
998 return -EIO;
999
1000 return dci_attr->show(dci_obj, dci_attr, buf);
1001}
1002
1003/**
1004 * dci_attr_store - store function for dci object
1005 * @kobj: pointer to kobject
1006 * @attr: pointer to attribute struct
1007 * @buf: buffer
1008 * @len: length of buffer
1009 */
1010static ssize_t dci_attr_store(struct kobject *kobj,
1011 struct attribute *attr,
1012 const char *buf,
1013 size_t len)
1014{
1015 struct most_dci_attribute *dci_attr = to_dci_attr(attr);
1016 struct most_dci_obj *dci_obj = to_dci_obj(kobj);
1017
1018 if (!dci_attr->store)
1019 return -EIO;
1020
1021 return dci_attr->store(dci_obj, dci_attr, buf, len);
1022}
1023
1024static const struct sysfs_ops most_dci_sysfs_ops = {
1025 .show = dci_attr_show,
1026 .store = dci_attr_store,
1027};
1028
1029/**
1030 * most_dci_release - release function for dci object
1031 * @kobj: pointer to kobject
1032 *
1033 * This frees the memory allocated for the dci object
1034 */
1035static void most_dci_release(struct kobject *kobj)
1036{
1037 struct most_dci_obj *dci_obj = to_dci_obj(kobj);
1038
1039 kfree(dci_obj);
1040}
1041
1042static ssize_t show_value(struct most_dci_obj *dci_obj,
1043 struct most_dci_attribute *attr, char *buf)
1044{
1045 u16 tmp_val;
1046 u16 reg_addr;
1047 int err;
1048
1049 if (!strcmp(attr->attr.name, "ni_state"))
1050 reg_addr = DRCI_REG_NI_STATE;
1051 else if (!strcmp(attr->attr.name, "packet_bandwidth"))
1052 reg_addr = DRCI_REG_PACKET_BW;
1053 else if (!strcmp(attr->attr.name, "node_address"))
1054 reg_addr = DRCI_REG_NODE_ADDR;
1055 else if (!strcmp(attr->attr.name, "node_position"))
1056 reg_addr = DRCI_REG_NODE_POS;
1057 else if (!strcmp(attr->attr.name, "mep_filter"))
1058 reg_addr = DRCI_REG_MEP_FILTER;
1059 else if (!strcmp(attr->attr.name, "mep_hash0"))
1060 reg_addr = DRCI_REG_HASH_TBL0;
1061 else if (!strcmp(attr->attr.name, "mep_hash1"))
1062 reg_addr = DRCI_REG_HASH_TBL1;
1063 else if (!strcmp(attr->attr.name, "mep_hash2"))
1064 reg_addr = DRCI_REG_HASH_TBL2;
1065 else if (!strcmp(attr->attr.name, "mep_hash3"))
1066 reg_addr = DRCI_REG_HASH_TBL3;
1067 else if (!strcmp(attr->attr.name, "mep_eui48_hi"))
1068 reg_addr = DRCI_REG_HW_ADDR_HI;
1069 else if (!strcmp(attr->attr.name, "mep_eui48_mi"))
1070 reg_addr = DRCI_REG_HW_ADDR_MI;
1071 else if (!strcmp(attr->attr.name, "mep_eui48_lo"))
1072 reg_addr = DRCI_REG_HW_ADDR_LO;
1073 else
1074 return -EIO;
1075
1076 err = drci_rd_reg(dci_obj->usb_device, reg_addr, &tmp_val);
1077 if (err < 0)
1078 return err;
1079
1080 return snprintf(buf, PAGE_SIZE, "%04x\n", le16_to_cpu(tmp_val));
1081}
1082
1083static ssize_t store_value(struct most_dci_obj *dci_obj,
1084 struct most_dci_attribute *attr,
1085 const char *buf, size_t count)
1086{
f1b9a843 1087 u16 val;
a4198cdf
CG		 1088 u16 reg_addr;
1089 int err;
1090
1091 if (!strcmp(attr->attr.name, "mep_filter"))
1092 reg_addr = DRCI_REG_MEP_FILTER;
1093 else if (!strcmp(attr->attr.name, "mep_hash0"))
1094 reg_addr = DRCI_REG_HASH_TBL0;
1095 else if (!strcmp(attr->attr.name, "mep_hash1"))
1096 reg_addr = DRCI_REG_HASH_TBL1;
1097 else if (!strcmp(attr->attr.name, "mep_hash2"))
1098 reg_addr = DRCI_REG_HASH_TBL2;
1099 else if (!strcmp(attr->attr.name, "mep_hash3"))
1100 reg_addr = DRCI_REG_HASH_TBL3;
1101 else if (!strcmp(attr->attr.name, "mep_eui48_hi"))
1102 reg_addr = DRCI_REG_HW_ADDR_HI;
1103 else if (!strcmp(attr->attr.name, "mep_eui48_mi"))
1104 reg_addr = DRCI_REG_HW_ADDR_MI;
1105 else if (!strcmp(attr->attr.name, "mep_eui48_lo"))
1106 reg_addr = DRCI_REG_HW_ADDR_LO;
1107 else
1108 return -EIO;
1109
f1b9a843 1110 err = kstrtou16(buf, 16, &val);
a4198cdf
CG		 1111 if (err)
1112 return err;
1113
f1b9a843 1114 err = drci_wr_reg(dci_obj->usb_device, reg_addr, val);
a4198cdf
CG		 1115 if (err < 0)
1116 return err;
1117
1118 return count;
1119}
1120
1121static MOST_DCI_RO_ATTR(ni_state);
1122static MOST_DCI_RO_ATTR(packet_bandwidth);
1123static MOST_DCI_RO_ATTR(node_address);
1124static MOST_DCI_RO_ATTR(node_position);
1125static MOST_DCI_ATTR(mep_filter);
1126static MOST_DCI_ATTR(mep_hash0);
1127static MOST_DCI_ATTR(mep_hash1);
1128static MOST_DCI_ATTR(mep_hash2);
1129static MOST_DCI_ATTR(mep_hash3);
1130static MOST_DCI_ATTR(mep_eui48_hi);
1131static MOST_DCI_ATTR(mep_eui48_mi);
1132static MOST_DCI_ATTR(mep_eui48_lo);
1133
1134/**
1135 * most_dci_def_attrs - array of default attribute files of the dci object
1136 */
1137static struct attribute *most_dci_def_attrs[] = {
1138 &most_dci_attr_ni_state.attr,
1139 &most_dci_attr_packet_bandwidth.attr,
1140 &most_dci_attr_node_address.attr,
1141 &most_dci_attr_node_position.attr,
1142 &most_dci_attr_mep_filter.attr,
1143 &most_dci_attr_mep_hash0.attr,
1144 &most_dci_attr_mep_hash1.attr,
1145 &most_dci_attr_mep_hash2.attr,
1146 &most_dci_attr_mep_hash3.attr,
1147 &most_dci_attr_mep_eui48_hi.attr,
1148 &most_dci_attr_mep_eui48_mi.attr,
1149 &most_dci_attr_mep_eui48_lo.attr,
1150 NULL,
1151};
1152
1153/**
1154 * DCI ktype
1155 */
1156static struct kobj_type most_dci_ktype = {
1157 .sysfs_ops = &most_dci_sysfs_ops,
1158 .release = most_dci_release,
1159 .default_attrs = most_dci_def_attrs,
1160};
1161
1162/**
1163 * create_most_dci_obj - allocates a dci object
1164 * @parent: parent kobject
1165 *
1166 * This creates a dci object and registers it with sysfs.
1167 * Returns a pointer to the object or NULL when something went wrong.
1168 */
1169static struct
1170most_dci_obj *create_most_dci_obj(struct kobject *parent)
1171{
1172 struct most_dci_obj *most_dci;
1173 int retval;
1174
1175 most_dci = kzalloc(sizeof(*most_dci), GFP_KERNEL);
1176 if (!most_dci)
1177 return NULL;
1178
1179 retval = kobject_init_and_add(&most_dci->kobj, &most_dci_ktype, parent,
1180 "dci");
1181 if (retval) {
1182 kobject_put(&most_dci->kobj);
1183 return NULL;
1184 }
1185 return most_dci;
1186}
1187
1188/**
1189 * destroy_most_dci_obj - DCI object release function
1190 * @p: pointer to dci object
1191 */
1192static void destroy_most_dci_obj(struct most_dci_obj *p)
1193{
1194 kobject_put(&p->kobj);
1195}
1196
1197/**
1198 * hdm_probe - probe function of USB device driver
1199 * @interface: Interface of the attached USB device
1200 * @id: Pointer to the USB ID table.
1201 *
1202 * This allocates and initializes the device instance, adds the new
1203 * entry to the internal list, scans the USB descriptors and registers
1204 * the interface with the core.
1205 * Additionally, the DCI objects are created and the hardware is sync'd.
1206 *
1207 * Return 0 on success. In case of an error a negative number is returned.
1208 */
1209static int
1210hdm_probe(struct usb_interface *interface, const struct usb_device_id *id)
1211{
1212 unsigned int i;
1213 unsigned int num_endpoints;
1214 struct most_channel_capability *tmp_cap;
1215 struct most_dev *mdev;
1216 struct usb_device *usb_dev;
59ed0480 1217 struct device *dev;
a4198cdf
CG		 1218 struct usb_host_interface *usb_iface_desc;
1219 struct usb_endpoint_descriptor *ep_desc;
1220 int ret = 0;
d747e8ec 1221 int err;
a4198cdf
CG		 1222
1223 usb_iface_desc = interface->cur_altsetting;
1224 usb_dev = interface_to_usbdev(interface);
59ed0480 1225 dev = &usb_dev->dev;
a4198cdf
CG		 1226 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
1227 if (!mdev)
1228 goto exit_ENOMEM;
1229
1230 usb_set_intfdata(interface, mdev);
1231 num_endpoints = usb_iface_desc->desc.bNumEndpoints;
1232 mutex_init(&mdev->io_mutex);
1233 INIT_WORK(&mdev->poll_work_obj, wq_netinfo);
1234 init_timer(&mdev->link_stat_timer);
1235
1236 mdev->usb_device = usb_dev;
1237 mdev->link_stat_timer.function = link_stat_timer_handler;
1238 mdev->link_stat_timer.data = (unsigned long)mdev;
1239 mdev->link_stat_timer.expires = jiffies + (2 * HZ);
1240
1241 mdev->iface.mod = hdm_usb_fops.owner;
1242 mdev->iface.interface = ITYPE_USB;
1243 mdev->iface.configure = hdm_configure_channel;
1244 mdev->iface.request_netinfo = hdm_request_netinfo;
1245 mdev->iface.enqueue = hdm_enqueue;
1246 mdev->iface.poison_channel = hdm_poison_channel;
1247 mdev->iface.description = mdev->description;
1248 mdev->iface.num_channels = num_endpoints;
1249
1250 snprintf(mdev->description, sizeof(mdev->description),
1251 "usb_device %d-%s:%d.%d",
1252 usb_dev->bus->busnum,
1253 usb_dev->devpath,
1254 usb_dev->config->desc.bConfigurationValue,
1255 usb_iface_desc->desc.bInterfaceNumber);
1256
1257 mdev->conf = kcalloc(num_endpoints, sizeof(*mdev->conf), GFP_KERNEL);
1258 if (!mdev->conf)
1259 goto exit_free;
1260
1261 mdev->cap = kcalloc(num_endpoints, sizeof(*mdev->cap), GFP_KERNEL);
1262 if (!mdev->cap)
1263 goto exit_free1;
1264
1265 mdev->iface.channel_vector = mdev->cap;
1266 mdev->iface.priv = NULL;
1267
1268 mdev->ep_address =
1269 kcalloc(num_endpoints, sizeof(*mdev->ep_address), GFP_KERNEL);
1270 if (!mdev->ep_address)
1271 goto exit_free2;
1272
1273 mdev->anchor_list =
1274 kcalloc(num_endpoints, sizeof(*mdev->anchor_list), GFP_KERNEL);
1275 if (!mdev->anchor_list)
1276 goto exit_free3;
1277
1278 tmp_cap = mdev->cap;
1279 for (i = 0; i < num_endpoints; i++) {
1280 ep_desc = &usb_iface_desc->endpoint[i].desc;
1281 mdev->ep_address[i] = ep_desc->bEndpointAddress;
1282 mdev->padding_active[i] = false;
1283 mdev->is_channel_healthy[i] = true;
1284
1285 snprintf(&mdev->suffix[i][0], MAX_SUFFIX_LEN, "ep%02x",
1286 mdev->ep_address[i]);
1287
1288 tmp_cap->name_suffix = &mdev->suffix[i][0];
1289 tmp_cap->buffer_size_packet = MAX_BUF_SIZE;
1290 tmp_cap->buffer_size_streaming = MAX_BUF_SIZE;
1291 tmp_cap->num_buffers_packet = BUF_CHAIN_SIZE;
1292 tmp_cap->num_buffers_streaming = BUF_CHAIN_SIZE;
1293 tmp_cap->data_type = MOST_CH_CONTROL | MOST_CH_ASYNC |
1294 MOST_CH_ISOC_AVP | MOST_CH_SYNC;
1295 if (ep_desc->bEndpointAddress & USB_DIR_IN)
1296 tmp_cap->direction = MOST_CH_RX;
1297 else
1298 tmp_cap->direction = MOST_CH_TX;
1299 tmp_cap++;
1300 INIT_LIST_HEAD(&mdev->anchor_list[i]);
1301 spin_lock_init(&mdev->anchor_list_lock[i]);
d747e8ec
CG		 1302 err = drci_wr_reg(usb_dev,
1303 DRCI_REG_BASE + DRCI_COMMAND +
1304 ep_desc->bEndpointAddress * 16,
f1b9a843 1305 1);
d747e8ec
CG		 1306 if (err < 0)
1307 pr_warn("DCI Sync for EP %02x failed",
1308 ep_desc->bEndpointAddress);
a4198cdf 1309 }
59ed0480
CG		 1310 dev_notice(dev, "claimed gadget: Vendor=%4.4x ProdID=%4.4x Bus=%02x Device=%02x\n",
1311 le16_to_cpu(usb_dev->descriptor.idVendor),
1312 le16_to_cpu(usb_dev->descriptor.idProduct),
1313 usb_dev->bus->busnum,
1314 usb_dev->devnum);
1315
1316 dev_notice(dev, "device path: /sys/bus/usb/devices/%d-%s:%d.%d\n",
1317 usb_dev->bus->busnum,
1318 usb_dev->devpath,
1319 usb_dev->config->desc.bConfigurationValue,
1320 usb_iface_desc->desc.bInterfaceNumber);
a4198cdf
CG		 1321
1322 mdev->parent = most_register_interface(&mdev->iface);
1323 if (IS_ERR(mdev->parent)) {
1324 ret = PTR_ERR(mdev->parent);
1325 goto exit_free4;
1326 }
1327
1328 mutex_lock(&mdev->io_mutex);
1329 if (le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_INIC) {
1330 /* this increments the reference count of the instance
1331 * object of the core
1332 */
1333 mdev->dci = create_most_dci_obj(mdev->parent);
1334 if (!mdev->dci) {
1335 mutex_unlock(&mdev->io_mutex);
1336 most_deregister_interface(&mdev->iface);
1337 ret = -ENOMEM;
1338 goto exit_free4;
1339 }
1340
1341 kobject_uevent(&mdev->dci->kobj, KOBJ_ADD);
1342 mdev->dci->usb_device = mdev->usb_device;
a4198cdf
CG		 1343 }
1344 mutex_unlock(&mdev->io_mutex);
1345 return 0;
1346
1347exit_free4:
1348 kfree(mdev->anchor_list);
1349exit_free3:
1350 kfree(mdev->ep_address);
1351exit_free2:
1352 kfree(mdev->cap);
1353exit_free1:
1354 kfree(mdev->conf);
1355exit_free:
1356 kfree(mdev);
1357exit_ENOMEM:
1358 if (ret == 0 || ret == -ENOMEM) {
1359 ret = -ENOMEM;
59ed0480 1360 dev_err(dev, "out of memory\n");
a4198cdf
CG		 1361 }
1362 return ret;
1363}
1364
1365/**
1366 * hdm_disconnect - disconnect function of USB device driver
1367 * @interface: Interface of the attached USB device
1368 *
1369 * This deregisters the interface with the core, removes the kernel timer
1370 * and frees resources.
1371 *
1372 * Context: hub kernel thread
1373 */
1374static void hdm_disconnect(struct usb_interface *interface)
1375{
1376 struct most_dev *mdev;
1377
1378 mdev = usb_get_intfdata(interface);
a4198cdf
CG		 1379 mutex_lock(&mdev->io_mutex);
1380 usb_set_intfdata(interface, NULL);
1381 mdev->usb_device = NULL;
1382 mutex_unlock(&mdev->io_mutex);
1383
1384 del_timer_sync(&mdev->link_stat_timer);
1385 cancel_work_sync(&mdev->poll_work_obj);
1386
1387 destroy_most_dci_obj(mdev->dci);
1388 most_deregister_interface(&mdev->iface);
1389
1390 kfree(mdev->anchor_list);
1391 kfree(mdev->cap);
1392 kfree(mdev->conf);
1393 kfree(mdev->ep_address);
1394 kfree(mdev);
1395}
1396
1397static struct usb_driver hdm_usb = {
1398 .name = "hdm_usb",
1399 .id_table = usbid,
1400 .probe = hdm_probe,
1401 .disconnect = hdm_disconnect,
1402};
1403
1404static int __init hdm_usb_init(void)
1405{
1406 pr_info("hdm_usb_init()\n");
1407 if (usb_register(&hdm_usb)) {
59ed0480 1408 pr_err("could not register hdm_usb driver\n");
a4198cdf
CG		 1409 return -EIO;
1410 }
1411 schedule_usb_work = create_workqueue("hdmu_work");
1412 if (schedule_usb_work == NULL) {
59ed0480 1413 pr_err("could not create workqueue\n");
a4198cdf
CG		 1414 usb_deregister(&hdm_usb);
1415 return -ENOMEM;
1416 }
1417 return 0;
1418}
1419
1420static void __exit hdm_usb_exit(void)
1421{
1422 pr_info("hdm_usb_exit()\n");
1423 destroy_workqueue(schedule_usb_work);
1424 usb_deregister(&hdm_usb);
1425}
1426
1427module_init(hdm_usb_init);
1428module_exit(hdm_usb_exit);
1429MODULE_LICENSE("GPL");
1430MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>");
1431MODULE_DESCRIPTION("HDM_4_USB");
Linux kernel - Deliverables
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