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Staging: most: mostcore/core.c. Fix "Using plain integer as NULL pointer" warnings
[linux-block.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
62#define DRCI_READ_REQ 0xA0
63#define DRCI_WRITE_REQ 0xA1
64
65/**
66 * struct buf_anchor - used to create a list of pending URBs
67 * @urb: pointer to USB request block
68 * @clear_work_obj:
69 * @list: linked list
70 * @urb_completion:
71 */
72struct buf_anchor {
73 struct urb *urb;
74 struct work_struct clear_work_obj;
75 struct list_head list;
76 struct completion urb_compl;
77};
78#define to_buf_anchor(w) container_of(w, struct buf_anchor, clear_work_obj)
79
80/**
81 * struct most_dci_obj - Direct Communication Interface
82 * @kobj:position in sysfs
83 * @usb_device: pointer to the usb device
84 */
85struct most_dci_obj {
86 struct kobject kobj;
87 struct usb_device *usb_device;
88};
89#define to_dci_obj(p) container_of(p, struct most_dci_obj, kobj)
90
91/**
92 * struct most_dev - holds all usb interface specific stuff
93 * @parent: parent object in sysfs
94 * @usb_device: pointer to usb device
95 * @iface: hardware interface
96 * @cap: channel capabilities
97 * @conf: channel configuration
98 * @dci: direct communication interface of hardware
99 * @hw_addr: MAC address of hardware
100 * @ep_address: endpoint address table
101 * @link_stat: link status of hardware
102 * @description: device description
103 * @suffix: suffix for channel name
104 * @anchor_list_lock: locks list access
105 * @padding_active: indicates channel uses padding
106 * @is_channel_healthy: health status table of each channel
107 * @anchor_list: list of anchored items
108 * @io_mutex: synchronize I/O with disconnect
109 * @link_stat_timer: timer for link status reports
110 * @poll_work_obj: work for polling link status
111 */
112struct most_dev {
113 struct kobject *parent;
114 struct usb_device *usb_device;
115 struct most_interface iface;
116 struct most_channel_capability *cap;
117 struct most_channel_config *conf;
118 struct most_dci_obj *dci;
119 u8 hw_addr[6];
120 u8 *ep_address;
121 u16 link_stat;
122 char description[MAX_STRING_LEN];
123 char suffix[MAX_NUM_ENDPOINTS][MAX_SUFFIX_LEN];
124 spinlock_t anchor_list_lock[MAX_NUM_ENDPOINTS];
125 bool padding_active[MAX_NUM_ENDPOINTS];
126 bool is_channel_healthy[MAX_NUM_ENDPOINTS];
127 struct list_head *anchor_list;
128 struct mutex io_mutex;
129 struct timer_list link_stat_timer;
130 struct work_struct poll_work_obj;
131};
132#define to_mdev(d) container_of(d, struct most_dev, iface)
133#define to_mdev_from_work(w) container_of(w, struct most_dev, poll_work_obj)
134
135static struct workqueue_struct *schedule_usb_work;
136static void wq_clear_halt(struct work_struct *wq_obj);
137static void wq_netinfo(struct work_struct *wq_obj);
138
139/**
140 * trigger_resync_vr - Vendor request to trigger HW re-sync mechanism
141 * @dev: usb device
142 *
143 */
412c8232 144static void trigger_resync_vr(struct usb_device *dev)
a4198cdf 145{
412c8232
CG		 146 int retval;
147 u8 request_type = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT;
148 int *data = kzalloc(sizeof(*data), GFP_KERNEL);
a4198cdf 149
412c8232
CG		 150 if (!data)
151 goto error;
152 *data = HW_RESYNC;
153 retval = usb_control_msg(dev,
154 usb_sndctrlpipe(dev, 0),
155 0,
156 request_type,
157 0,
158 0,
159 data,
160 0,
161 5 * HZ);
162 kfree(data);
163 if (retval >= 0)
164 return;
165error:
59ed0480 166 dev_err(&dev->dev, "Vendor request \"stall\" failed\n");
a4198cdf
CG		 167}
168
169/**
170 * drci_rd_reg - read a DCI register
171 * @dev: usb device
172 * @reg: register address
173 * @buf: buffer to store data
174 *
175 * This is reads data from INIC's direct register communication interface
176 */
177static inline int drci_rd_reg(struct usb_device *dev, u16 reg, void *buf)
178{
179 return usb_control_msg(dev,
180 usb_rcvctrlpipe(dev, 0),
181 DRCI_READ_REQ,
182 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
183 0x0000,
184 reg,
185 buf,
186 2,
187 5 * HZ);
188}
189
190/**
191 * drci_wr_reg - write a DCI register
192 * @dev: usb device
193 * @reg: register address
194 * @data: data to write
195 *
196 * This is writes data to INIC's direct register communication interface
197 */
198static inline int drci_wr_reg(struct usb_device *dev, u16 reg, u16 data)
199{
200 return usb_control_msg(dev,
201 usb_sndctrlpipe(dev, 0),
202 DRCI_WRITE_REQ,
203 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
204 data,
205 reg,
206 NULL,
207 0,
208 5 * HZ);
209}
210
211/**
212 * free_anchored_buffers - free device's anchored items
213 * @mdev: the device
214 * @channel: channel ID
215 */
216static void free_anchored_buffers(struct most_dev *mdev, unsigned int channel)
217{
218 struct mbo *mbo;
219 struct buf_anchor *anchor, *tmp;
220 unsigned long flags;
221
222 spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
223 list_for_each_entry_safe(anchor, tmp, &mdev->anchor_list[channel], list) {
224 struct urb *urb = anchor->urb;
225
226 spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
227 if (likely(urb)) {
228 mbo = urb->context;
229 if (!irqs_disabled()) {
230 usb_kill_urb(urb);
231 } else {
232 usb_unlink_urb(urb);
233 wait_for_completion(&anchor->urb_compl);
234 }
235 if ((mbo) && (mbo->complete)) {
236 mbo->status = MBO_E_CLOSE;
237 mbo->processed_length = 0;
238 mbo->complete(mbo);
239 }
240 usb_free_urb(urb);
241 }
242 spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
243 list_del(&anchor->list);
244 kfree(anchor);
245 }
246 spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
247}
248
249/**
250 * get_stream_frame_size - calculate frame size of current configuration
251 * @cfg: channel configuration
252 */
253static unsigned int get_stream_frame_size(struct most_channel_config *cfg)
254{
255 unsigned int frame_size = 0;
256 unsigned int sub_size = cfg->subbuffer_size;
257
258 if (!sub_size) {
59ed0480 259 pr_warn("Misconfig: Subbuffer size zero.\n");
a4198cdf
CG		 260 return frame_size;
261 }
262 switch (cfg->data_type) {
263 case MOST_CH_ISOC_AVP:
264 frame_size = AV_PACKETS_PER_XACT * sub_size;
265 break;
266 case MOST_CH_SYNC:
267 if (cfg->packets_per_xact == 0) {
59ed0480 268 pr_warn("Misconfig: Packets per XACT zero\n");
a4198cdf
CG		 269 frame_size = 0;
270 } else if (cfg->packets_per_xact == 0xFF)
271 frame_size = (USB_MTU / sub_size) * sub_size;
272 else
273 frame_size = cfg->packets_per_xact * sub_size;
274 break;
275 default:
276 pr_warn("Query frame size of non-streaming channel\n");
277 break;
278 }
279 return frame_size;
280}
281
282/**
283 * hdm_poison_channel - mark buffers of this channel as invalid
284 * @iface: pointer to the interface
285 * @channel: channel ID
286 *
287 * This unlinks all URBs submitted to the HCD,
288 * calls the associated completion function of the core and removes
289 * them from the list.
290 *
291 * Returns 0 on success or error code otherwise.
292 */
293int hdm_poison_channel(struct most_interface *iface, int channel)
294{
295 struct most_dev *mdev;
296
59ed0480 297 mdev = to_mdev(iface);
a4198cdf 298 if (unlikely(!iface)) {
59ed0480 299 dev_warn(&mdev->usb_device->dev, "Poison: Bad interface.\n");
a4198cdf
CG		 300 return -EIO;
301 }
302 if (unlikely((channel < 0) || (channel >= iface->num_channels))) {
59ed0480 303 dev_warn(&mdev->usb_device->dev, "Channel ID out of range.\n");
a4198cdf
CG		 304 return -ECHRNG;
305 }
306
a4198cdf
CG		 307 mdev->is_channel_healthy[channel] = false;
308
309 mutex_lock(&mdev->io_mutex);
310 free_anchored_buffers(mdev, channel);
311 if (mdev->padding_active[channel] == true)
312 mdev->padding_active[channel] = false;
313
314 if (mdev->conf[channel].data_type == MOST_CH_ASYNC) {
315 del_timer_sync(&mdev->link_stat_timer);
316 cancel_work_sync(&mdev->poll_work_obj);
317 }
318 mutex_unlock(&mdev->io_mutex);
319 return 0;
320}
321
322/**
323 * hdm_add_padding - add padding bytes
324 * @mdev: most device
325 * @channel: channel ID
326 * @mbo: buffer object
327 *
328 * This inserts the INIC hardware specific padding bytes into a streaming
329 * channel's buffer
330 */
331int hdm_add_padding(struct most_dev *mdev, int channel, struct mbo *mbo)
332{
333 struct most_channel_config *conf = &mdev->conf[channel];
334 unsigned int j, num_frames, frame_size;
335 u16 rd_addr, wr_addr;
336
337 frame_size = get_stream_frame_size(conf);
338 if (!frame_size)
339 return -EIO;
340 num_frames = mbo->buffer_length / frame_size;
341
342 if (num_frames < 1) {
59ed0480
CG		 343 dev_err(&mdev->usb_device->dev,
344 "Missed minimal transfer unit.\n");
a4198cdf
CG		 345 return -EIO;
346 }
347
348 for (j = 1; j < num_frames; j++) {
349 wr_addr = (num_frames - j) * USB_MTU;
350 rd_addr = (num_frames - j) * frame_size;
351 memmove(mbo->virt_address + wr_addr,
352 mbo->virt_address + rd_addr,
353 frame_size);
354 }
355 mbo->buffer_length = num_frames * USB_MTU;
356 return 0;
357}
358
359/**
360 * hdm_remove_padding - remove padding bytes
361 * @mdev: most device
362 * @channel: channel ID
363 * @mbo: buffer object
364 *
365 * This takes the INIC hardware specific padding bytes off a streaming
366 * channel's buffer.
367 */
368int hdm_remove_padding(struct most_dev *mdev, int channel, struct mbo *mbo)
369{
370 unsigned int j, num_frames, frame_size;
371 struct most_channel_config *const conf = &mdev->conf[channel];
372
373 frame_size = get_stream_frame_size(conf);
374 if (!frame_size)
375 return -EIO;
376 num_frames = mbo->processed_length / USB_MTU;
377
378 for (j = 1; j < num_frames; j++)
379 memmove(mbo->virt_address + frame_size * j,
380 mbo->virt_address + USB_MTU * j,
381 frame_size);
382
383 mbo->processed_length = frame_size * num_frames;
384 return 0;
385}
386
387/**
388 * hdm_write_completion - completion function for submitted Tx URBs
389 * @urb: the URB that has been completed
390 *
391 * This checks the status of the completed URB. In case the URB has been
392 * unlinked before, it is immediately freed. On any other error the MBO
393 * transfer flag is set. On success it frees allocated resources and calls
394 * the completion function.
395 *
396 * Context: interrupt!
397 */
398static void hdm_write_completion(struct urb *urb)
399{
400 struct mbo *mbo;
401 struct buf_anchor *anchor;
402 struct most_dev *mdev;
59ed0480 403 struct device *dev;
a4198cdf
CG		 404 unsigned int channel;
405 unsigned long flags;
406
407 mbo = urb->context;
408 anchor = mbo->priv;
409 mdev = to_mdev(mbo->ifp);
410 channel = mbo->hdm_channel_id;
59ed0480 411 dev = &mdev->usb_device->dev;
a4198cdf
CG		 412
413 if ((urb->status == -ENOENT) || (urb->status == -ECONNRESET) ||
414 (mdev->is_channel_healthy[channel] == false)) {
415 complete(&anchor->urb_compl);
416 return;
417 }
418
419 if (unlikely(urb->status && !(urb->status == -ENOENT ||
420 urb->status == -ECONNRESET ||
421 urb->status == -ESHUTDOWN))) {
422 mbo->processed_length = 0;
423 switch (urb->status) {
424 case -EPIPE:
59ed0480 425 dev_warn(dev, "Broken OUT pipe detected\n");
a4198cdf
CG		 426 most_stop_enqueue(&mdev->iface, channel);
427 mbo->status = MBO_E_INVAL;
428 usb_unlink_urb(urb);
429 INIT_WORK(&anchor->clear_work_obj, wq_clear_halt);
430 queue_work(schedule_usb_work, &anchor->clear_work_obj);
431 return;
432 case -ENODEV:
433 case -EPROTO:
434 mbo->status = MBO_E_CLOSE;
435 break;
436 default:
437 mbo->status = MBO_E_INVAL;
438 break;
439 }
440 } else {
441 mbo->status = MBO_SUCCESS;
442 mbo->processed_length = urb->actual_length;
443 }
444
445 spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
446 list_del(&anchor->list);
447 spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
448 kfree(anchor);
449
450 if (likely(mbo->complete))
451 mbo->complete(mbo);
452 usb_free_urb(urb);
453}
454
455/**
456 * hdm_read_completion - completion funciton for submitted Rx URBs
457 * @urb: the URB that has been completed
458 *
459 * This checks the status of the completed URB. In case the URB has been
460 * unlinked before it is immediately freed. On any other error the MBO transfer
461 * flag is set. On success it frees allocated resources, removes
462 * padding bytes -if necessary- and calls the completion function.
463 *
464 * Context: interrupt!
465 *
466 * **************************************************************************
467 * Error codes returned by in urb->status
468 * or in iso_frame_desc[n].status (for ISO)
469 * *************************************************************************
470 *
471 * USB device drivers may only test urb status values in completion handlers.
472 * This is because otherwise there would be a race between HCDs updating
473 * these values on one CPU, and device drivers testing them on another CPU.
474 *
475 * A transfer's actual_length may be positive even when an error has been
476 * reported. That's because transfers often involve several packets, so that
477 * one or more packets could finish before an error stops further endpoint I/O.
478 *
479 * For isochronous URBs, the urb status value is non-zero only if the URB is
480 * unlinked, the device is removed, the host controller is disabled or the total
481 * transferred length is less than the requested length and the URB_SHORT_NOT_OK
482 * flag is set. Completion handlers for isochronous URBs should only see
483 * urb->status set to zero, -ENOENT, -ECONNRESET, -ESHUTDOWN, or -EREMOTEIO.
484 * Individual frame descriptor status fields may report more status codes.
485 *
486 *
487 * 0 Transfer completed successfully
488 *
489 * -ENOENT URB was synchronously unlinked by usb_unlink_urb
490 *
491 * -EINPROGRESS URB still pending, no results yet
492 * (That is, if drivers see this it's a bug.)
493 *
494 * -EPROTO (*, **) a) bitstuff error
495 * b) no response packet received within the
496 * prescribed bus turn-around time
497 * c) unknown USB error
498 *
499 * -EILSEQ (*, **) a) CRC mismatch
500 * b) no response packet received within the
501 * prescribed bus turn-around time
502 * c) unknown USB error
503 *
504 * Note that often the controller hardware does not
505 * distinguish among cases a), b), and c), so a
506 * driver cannot tell whether there was a protocol
507 * error, a failure to respond (often caused by
508 * device disconnect), or some other fault.
509 *
510 * -ETIME (**) No response packet received within the prescribed
511 * bus turn-around time. This error may instead be
512 * reported as -EPROTO or -EILSEQ.
513 *
514 * -ETIMEDOUT Synchronous USB message functions use this code
515 * to indicate timeout expired before the transfer
516 * completed, and no other error was reported by HC.
517 *
518 * -EPIPE (**) Endpoint stalled. For non-control endpoints,
519 * reset this status with usb_clear_halt().
520 *
521 * -ECOMM During an IN transfer, the host controller
522 * received data from an endpoint faster than it
523 * could be written to system memory
524 *
525 * -ENOSR During an OUT transfer, the host controller
526 * could not retrieve data from system memory fast
527 * enough to keep up with the USB data rate
528 *
529 * -EOVERFLOW (*) The amount of data returned by the endpoint was
530 * greater than either the max packet size of the
531 * endpoint or the remaining buffer size. "Babble".
532 *
533 * -EREMOTEIO The data read from the endpoint did not fill the
534 * specified buffer, and URB_SHORT_NOT_OK was set in
535 * urb->transfer_flags.
536 *
537 * -ENODEV Device was removed. Often preceded by a burst of
538 * other errors, since the hub driver doesn't detect
539 * device removal events immediately.
540 *
541 * -EXDEV ISO transfer only partially completed
542 * (only set in iso_frame_desc[n].status, not urb->status)
543 *
544 * -EINVAL ISO madness, if this happens: Log off and go home
545 *
546 * -ECONNRESET URB was asynchronously unlinked by usb_unlink_urb
547 *
548 * -ESHUTDOWN The device or host controller has been disabled due
549 * to some problem that could not be worked around,
550 * such as a physical disconnect.
551 *
552 *
553 * (*) Error codes like -EPROTO, -EILSEQ and -EOVERFLOW normally indicate
554 * hardware problems such as bad devices (including firmware) or cables.
555 *
556 * (**) This is also one of several codes that different kinds of host
557 * controller use to indicate a transfer has failed because of device
558 * disconnect. In the interval before the hub driver starts disconnect
559 * processing, devices may receive such fault reports for every request.
560 *
561 * See <https://www.kernel.org/doc/Documentation/usb/error-codes.txt>
562 */
563static void hdm_read_completion(struct urb *urb)
564{
565 struct mbo *mbo;
566 struct buf_anchor *anchor;
567 struct most_dev *mdev;
59ed0480 568 struct device *dev;
a4198cdf
CG		 569 unsigned long flags;
570 unsigned int channel;
571 struct most_channel_config *conf;
572
573 mbo = urb->context;
574 anchor = mbo->priv;
575 mdev = to_mdev(mbo->ifp);
576 channel = mbo->hdm_channel_id;
59ed0480 577 dev = &mdev->usb_device->dev;
a4198cdf
CG		 578
579 if ((urb->status == -ENOENT) || (urb->status == -ECONNRESET) ||
580 (mdev->is_channel_healthy[channel] == false)) {
581 complete(&anchor->urb_compl);
582 return;
583 }
584
585 conf = &mdev->conf[channel];
586
587 if (unlikely(urb->status && !(urb->status == -ENOENT ||
588 urb->status == -ECONNRESET ||
589 urb->status == -ESHUTDOWN))) {
590 mbo->processed_length = 0;
591 switch (urb->status) {
592 case -EPIPE:
59ed0480 593 dev_warn(dev, "Broken IN pipe detected\n");
a4198cdf
CG		 594 mbo->status = MBO_E_INVAL;
595 usb_unlink_urb(urb);
596 INIT_WORK(&anchor->clear_work_obj, wq_clear_halt);
597 queue_work(schedule_usb_work, &anchor->clear_work_obj);
598 return;
599 case -ENODEV:
600 case -EPROTO:
601 mbo->status = MBO_E_CLOSE;
602 break;
603 case -EOVERFLOW:
59ed0480 604 dev_warn(dev, "Babble on IN pipe detected\n");
a4198cdf
CG		 605 default:
606 mbo->status = MBO_E_INVAL;
607 break;
608 }
609 } else {
610 mbo->processed_length = urb->actual_length;
611 if (mdev->padding_active[channel] == false) {
612 mbo->status = MBO_SUCCESS;
613 } else {
614 if (hdm_remove_padding(mdev, channel, mbo)) {
615 mbo->processed_length = 0;
616 mbo->status = MBO_E_INVAL;
617 } else {
618 mbo->status = MBO_SUCCESS;
619 }
620 }
621 }
622 spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
623 list_del(&anchor->list);
624 spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
625 kfree(anchor);
626
627 if (likely(mbo->complete))
628 mbo->complete(mbo);
629 usb_free_urb(urb);
630}
631
632/**
633 * hdm_enqueue - receive a buffer to be used for data transfer
634 * @iface: interface to enqueue to
635 * @channel: ID of the channel
636 * @mbo: pointer to the buffer object
637 *
638 * This allocates a new URB and fills it according to the channel
639 * that is being used for transmission of data. Before the URB is
640 * submitted it is stored in the private anchor list.
641 *
642 * Returns 0 on success. On any error the URB is freed and a error code
643 * is returned.
644 *
645 * Context: Could in _some_ cases be interrupt!
646 */
647int hdm_enqueue(struct most_interface *iface, int channel, struct mbo *mbo)
648{
649 struct most_dev *mdev;
650 struct buf_anchor *anchor;
651 struct most_channel_config *conf;
59ed0480 652 struct device *dev;
a4198cdf
CG		 653 int retval = 0;
654 struct urb *urb;
655 unsigned long flags;
656 unsigned long length;
657 void *virt_address;
658
59ed0480 659 if (unlikely(!iface || !mbo))
a4198cdf 660 return -EIO;
59ed0480 661 if (unlikely(iface->num_channels <= channel) || (channel < 0))
a4198cdf 662 return -ECHRNG;
a4198cdf
CG		 663
664 mdev = to_mdev(iface);
665 conf = &mdev->conf[channel];
59ed0480 666 dev = &mdev->usb_device->dev;
a4198cdf
CG		 667
668 if (!mdev->usb_device)
669 return -ENODEV;
670
671 urb = usb_alloc_urb(NO_ISOCHRONOUS_URB, GFP_ATOMIC);
672 if (!urb) {
59ed0480 673 dev_err(dev, "Failed to allocate URB\n");
a4198cdf
CG		 674 return -ENOMEM;
675 }
676
677 anchor = kzalloc(sizeof(*anchor), GFP_ATOMIC);
678 if (!anchor) {
679 retval = -ENOMEM;
680 goto _error;
681 }
682
683 anchor->urb = urb;
684 init_completion(&anchor->urb_compl);
685 mbo->priv = anchor;
686
687 spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
688 list_add_tail(&anchor->list, &mdev->anchor_list[channel]);
689 spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
690
691 if ((mdev->padding_active[channel] == true) &&
692 (conf->direction & MOST_CH_TX))
693 if (hdm_add_padding(mdev, channel, mbo)) {
694 retval = -EIO;
695 goto _error_1;
696 }
697
698 urb->transfer_dma = mbo->bus_address;
699 virt_address = mbo->virt_address;
700 length = mbo->buffer_length;
701
702 if (conf->direction & MOST_CH_TX) {
703 usb_fill_bulk_urb(urb, mdev->usb_device,
704 usb_sndbulkpipe(mdev->usb_device,
705 mdev->ep_address[channel]),
706 virt_address,
707 length,
708 hdm_write_completion,
709 mbo);
710 if (conf->data_type != MOST_CH_ISOC_AVP)
711 urb->transfer_flags |= URB_ZERO_PACKET;
712 } else {
713 usb_fill_bulk_urb(urb, mdev->usb_device,
714 usb_rcvbulkpipe(mdev->usb_device,
715 mdev->ep_address[channel]),
716 virt_address,
717 length,
718 hdm_read_completion,
719 mbo);
720 }
721 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
722
723 retval = usb_submit_urb(urb, GFP_KERNEL);
724 if (retval) {
59ed0480 725 dev_err(dev, "URB submit failed with error %d.\n", retval);
a4198cdf
CG		 726 goto _error_1;
727 }
728 return 0;
729
730_error_1:
731 spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
732 list_del(&anchor->list);
733 spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
734 kfree(anchor);
735_error:
736 usb_free_urb(urb);
737 return retval;
738}
739
740/**
741 * hdm_configure_channel - receive channel configuration from core
742 * @iface: interface
743 * @channel: channel ID
744 * @conf: structure that holds the configuration information
745 */
746int hdm_configure_channel(struct most_interface *iface, int channel,
747 struct most_channel_config *conf)
748{
749 unsigned int num_frames;
750 unsigned int frame_size;
751 unsigned int temp_size;
752 unsigned int tail_space;
753 struct most_dev *mdev;
59ed0480
CG		 754 struct device *dev;
755
756 mdev = to_mdev(iface);
757 mdev->is_channel_healthy[channel] = true;
758 dev = &mdev->usb_device->dev;
a4198cdf
CG		 759
760 if (unlikely(!iface || !conf)) {
59ed0480 761 dev_err(dev, "Bad interface or config pointer.\n");
a4198cdf
CG		 762 return -EINVAL;
763 }
764 if (unlikely((channel < 0) || (channel >= iface->num_channels))) {
59ed0480 765 dev_err(dev, "Channel ID out of range.\n");
a4198cdf
CG		 766 return -EINVAL;
767 }
768 if ((!conf->num_buffers) || (!conf->buffer_size)) {
59ed0480 769 dev_err(dev, "Misconfig: buffer size or #buffers zero.\n");
a4198cdf
CG		 770 return -EINVAL;
771 }
772
a4198cdf
CG		 773 if (!(conf->data_type == MOST_CH_SYNC) &&
774 !((conf->data_type == MOST_CH_ISOC_AVP) &&
775 (conf->packets_per_xact != 0xFF))) {
776 mdev->padding_active[channel] = false;
777 goto exit;
778 }
779
780 mdev->padding_active[channel] = true;
781 temp_size = conf->buffer_size;
782
783 if ((conf->data_type != MOST_CH_SYNC) &&
784 (conf->data_type != MOST_CH_ISOC_AVP)) {
59ed0480 785 dev_warn(dev, "Unsupported data type\n");
a4198cdf
CG		 786 return -EINVAL;
787 }
788
789 frame_size = get_stream_frame_size(conf);
790 if ((frame_size == 0) || (frame_size > USB_MTU)) {
59ed0480 791 dev_warn(dev, "Misconfig: frame size wrong\n");
a4198cdf
CG		 792 return -EINVAL;
793 }
794
795 if (conf->buffer_size % frame_size) {
796 u16 tmp_val;
797
798 tmp_val = conf->buffer_size / frame_size;
799 conf->buffer_size = tmp_val * frame_size;
59ed0480
CG		 800 dev_notice(dev,
801 "Channel %d - rouding buffer size to %d bytes, "
802 "channel config says %d bytes\n",
803 channel,
804 conf->buffer_size,
805 temp_size);
a4198cdf
CG		 806 }
807
808 num_frames = conf->buffer_size / frame_size;
809 tail_space = num_frames * (USB_MTU - frame_size);
810 temp_size += tail_space;
811
812 /* calculate extra length to comply w/ HW padding */
813 conf->extra_len = (CEILING(temp_size, USB_MTU) * USB_MTU)
814 - conf->buffer_size;
815exit:
816 mdev->conf[channel] = *conf;
817 return 0;
818}
819
820/**
821 * hdm_update_netinfo - retrieve latest networking information
822 * @mdev: device interface
823 *
824 * This triggers the USB vendor requests to read the hardware address and
825 * the current link status of the attached device.
826 */
827int hdm_update_netinfo(struct most_dev *mdev)
828{
59ed0480 829 struct device *dev = &mdev->usb_device->dev;
a4198cdf
CG		 830 int i;
831 u16 link;
832 u8 addr[6];
833
834 if (!is_valid_ether_addr(mdev->hw_addr)) {
835 if (0 > drci_rd_reg(mdev->usb_device,
836 DRCI_REG_HW_ADDR_HI, addr)) {
59ed0480 837 dev_err(dev, "Vendor request \"hw_addr_hi\" failed\n");
a4198cdf
CG		 838 return -1;
839 }
840 if (0 > drci_rd_reg(mdev->usb_device,
841 DRCI_REG_HW_ADDR_MI, addr + 2)) {
59ed0480 842 dev_err(dev, "Vendor request \"hw_addr_mid\" failed\n");
a4198cdf
CG		 843 return -1;
844 }
845 if (0 > drci_rd_reg(mdev->usb_device,
846 DRCI_REG_HW_ADDR_LO, addr + 4)) {
59ed0480 847 dev_err(dev, "Vendor request \"hw_addr_low\" failed\n");
a4198cdf
CG		 848 return -1;
849 }
850 mutex_lock(&mdev->io_mutex);
851 for (i = 0; i < 6; i++)
852 mdev->hw_addr[i] = addr[i];
853 mutex_unlock(&mdev->io_mutex);
854
855 }
856 if (0 > drci_rd_reg(mdev->usb_device, DRCI_REG_NI_STATE, &link)) {
59ed0480 857 dev_err(dev, "Vendor request \"link status\" failed\n");
a4198cdf
CG		 858 return -1;
859 }
860 le16_to_cpus(&link);
861 mutex_lock(&mdev->io_mutex);
862 mdev->link_stat = link;
863 mutex_unlock(&mdev->io_mutex);
864 return 0;
865}
866
867/**
868 * hdm_request_netinfo - request network information
869 * @iface: pointer to interface
870 * @channel: channel ID
871 *
872 * This is used as trigger to set up the link status timer that
873 * polls for the NI state of the INIC every 2 seconds.
874 *
875 */
876void hdm_request_netinfo(struct most_interface *iface, int channel)
877{
878 struct most_dev *mdev;
879
880 BUG_ON(!iface);
881 mdev = to_mdev(iface);
882 mdev->link_stat_timer.expires = jiffies + HZ;
883 mod_timer(&mdev->link_stat_timer, mdev->link_stat_timer.expires);
884}
885
886/**
887 * link_stat_timer_handler - add work to link_stat work queue
888 * @data: pointer to USB device instance
889 *
890 * The handler runs in interrupt context. That's why we need to defer the
891 * tasks to a work queue.
892 */
893static void link_stat_timer_handler(unsigned long data)
894{
895 struct most_dev *mdev = (struct most_dev *)data;
896
897 queue_work(schedule_usb_work, &mdev->poll_work_obj);
898 mdev->link_stat_timer.expires = jiffies + (2 * HZ);
899 add_timer(&mdev->link_stat_timer);
900}
901
902/**
903 * wq_netinfo - work queue function
904 * @wq_obj: object that holds data for our deferred work to do
905 *
906 * This retrieves the network interface status of the USB INIC
907 * and compares it with the current status. If the status has
908 * changed, it updates the status of the core.
909 */
910static void wq_netinfo(struct work_struct *wq_obj)
911{
912 struct most_dev *mdev;
913 int i, prev_link_stat;
914 u8 prev_hw_addr[6];
915
916 mdev = to_mdev_from_work(wq_obj);
917 prev_link_stat = mdev->link_stat;
918
919 for (i = 0; i < 6; i++)
920 prev_hw_addr[i] = mdev->hw_addr[i];
921
922 if (0 > hdm_update_netinfo(mdev))
923 return;
924 if ((prev_link_stat != mdev->link_stat) ||
925 (prev_hw_addr[0] != mdev->hw_addr[0]) ||
926 (prev_hw_addr[1] != mdev->hw_addr[1]) ||
927 (prev_hw_addr[2] != mdev->hw_addr[2]) ||
928 (prev_hw_addr[3] != mdev->hw_addr[3]) ||
929 (prev_hw_addr[4] != mdev->hw_addr[4]) ||
930 (prev_hw_addr[5] != mdev->hw_addr[5]))
931 most_deliver_netinfo(&mdev->iface, mdev->link_stat,
932 &mdev->hw_addr[0]);
933}
934
935/**
936 * wq_clear_halt - work queue function
937 * @wq_obj: work_struct object to execute
938 *
939 * This sends a clear_halt to the given USB pipe.
940 */
941static void wq_clear_halt(struct work_struct *wq_obj)
942{
943 struct buf_anchor *anchor;
944 struct most_dev *mdev;
945 struct mbo *mbo;
946 struct urb *urb;
947 unsigned int channel;
948 unsigned long flags;
949
950 anchor = to_buf_anchor(wq_obj);
951 urb = anchor->urb;
952 mbo = urb->context;
953 mdev = to_mdev(mbo->ifp);
954 channel = mbo->hdm_channel_id;
955
956 if (usb_clear_halt(urb->dev, urb->pipe))
59ed0480 957 dev_warn(&mdev->usb_device->dev, "Failed to reset endpoint.\n");
a4198cdf
CG		 958
959 usb_free_urb(urb);
960 spin_lock_irqsave(&mdev->anchor_list_lock[channel], flags);
961 list_del(&anchor->list);
962 spin_unlock_irqrestore(&mdev->anchor_list_lock[channel], flags);
963
964 if (likely(mbo->complete))
965 mbo->complete(mbo);
966 if (mdev->conf[channel].direction & MOST_CH_TX)
967 most_resume_enqueue(&mdev->iface, channel);
968
969 kfree(anchor);
970}
971
972/**
973 * hdm_usb_fops - file operation table for USB driver
974 */
975static const struct file_operations hdm_usb_fops = {
976 .owner = THIS_MODULE,
977};
978
979/**
980 * usb_device_id - ID table for HCD device probing
981 */
982static struct usb_device_id usbid[] = {
983 { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_BRDG), },
984 { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_INIC), },
985 { } /* Terminating entry */
986};
987
988#define MOST_DCI_RO_ATTR(_name) \
989 struct most_dci_attribute most_dci_attr_##_name = \
990 __ATTR(_name, S_IRUGO, show_value, NULL)
991
992#define MOST_DCI_ATTR(_name) \
993 struct most_dci_attribute most_dci_attr_##_name = \
994 __ATTR(_name, S_IRUGO | S_IWUSR, show_value, store_value)
995
996/**
997 * struct most_dci_attribute - to access the attributes of a dci object
998 * @attr: attributes of a dci object
999 * @show: pointer to the show function
1000 * @store: pointer to the store function
1001 */
1002struct most_dci_attribute {
1003 struct attribute attr;
1004 ssize_t (*show)(struct most_dci_obj *d,
1005 struct most_dci_attribute *attr,
1006 char *buf);
1007 ssize_t (*store)(struct most_dci_obj *d,
1008 struct most_dci_attribute *attr,
1009 const char *buf,
1010 size_t count);
1011};
1012#define to_dci_attr(a) container_of(a, struct most_dci_attribute, attr)
1013
1014
1015/**
1016 * dci_attr_show - show function for dci object
1017 * @kobj: pointer to kobject
1018 * @attr: pointer to attribute struct
1019 * @buf: buffer
1020 */
1021static ssize_t dci_attr_show(struct kobject *kobj, struct attribute *attr,
1022 char *buf)
1023{
1024 struct most_dci_attribute *dci_attr = to_dci_attr(attr);
1025 struct most_dci_obj *dci_obj = to_dci_obj(kobj);
1026
1027 if (!dci_attr->show)
1028 return -EIO;
1029
1030 return dci_attr->show(dci_obj, dci_attr, buf);
1031}
1032
1033/**
1034 * dci_attr_store - store function for dci object
1035 * @kobj: pointer to kobject
1036 * @attr: pointer to attribute struct
1037 * @buf: buffer
1038 * @len: length of buffer
1039 */
1040static ssize_t dci_attr_store(struct kobject *kobj,
1041 struct attribute *attr,
1042 const char *buf,
1043 size_t len)
1044{
1045 struct most_dci_attribute *dci_attr = to_dci_attr(attr);
1046 struct most_dci_obj *dci_obj = to_dci_obj(kobj);
1047
1048 if (!dci_attr->store)
1049 return -EIO;
1050
1051 return dci_attr->store(dci_obj, dci_attr, buf, len);
1052}
1053
1054static const struct sysfs_ops most_dci_sysfs_ops = {
1055 .show = dci_attr_show,
1056 .store = dci_attr_store,
1057};
1058
1059/**
1060 * most_dci_release - release function for dci object
1061 * @kobj: pointer to kobject
1062 *
1063 * This frees the memory allocated for the dci object
1064 */
1065static void most_dci_release(struct kobject *kobj)
1066{
1067 struct most_dci_obj *dci_obj = to_dci_obj(kobj);
1068
1069 kfree(dci_obj);
1070}
1071
1072static ssize_t show_value(struct most_dci_obj *dci_obj,
1073 struct most_dci_attribute *attr, char *buf)
1074{
1075 u16 tmp_val;
1076 u16 reg_addr;
1077 int err;
1078
1079 if (!strcmp(attr->attr.name, "ni_state"))
1080 reg_addr = DRCI_REG_NI_STATE;
1081 else if (!strcmp(attr->attr.name, "packet_bandwidth"))
1082 reg_addr = DRCI_REG_PACKET_BW;
1083 else if (!strcmp(attr->attr.name, "node_address"))
1084 reg_addr = DRCI_REG_NODE_ADDR;
1085 else if (!strcmp(attr->attr.name, "node_position"))
1086 reg_addr = DRCI_REG_NODE_POS;
1087 else if (!strcmp(attr->attr.name, "mep_filter"))
1088 reg_addr = DRCI_REG_MEP_FILTER;
1089 else if (!strcmp(attr->attr.name, "mep_hash0"))
1090 reg_addr = DRCI_REG_HASH_TBL0;
1091 else if (!strcmp(attr->attr.name, "mep_hash1"))
1092 reg_addr = DRCI_REG_HASH_TBL1;
1093 else if (!strcmp(attr->attr.name, "mep_hash2"))
1094 reg_addr = DRCI_REG_HASH_TBL2;
1095 else if (!strcmp(attr->attr.name, "mep_hash3"))
1096 reg_addr = DRCI_REG_HASH_TBL3;
1097 else if (!strcmp(attr->attr.name, "mep_eui48_hi"))
1098 reg_addr = DRCI_REG_HW_ADDR_HI;
1099 else if (!strcmp(attr->attr.name, "mep_eui48_mi"))
1100 reg_addr = DRCI_REG_HW_ADDR_MI;
1101 else if (!strcmp(attr->attr.name, "mep_eui48_lo"))
1102 reg_addr = DRCI_REG_HW_ADDR_LO;
1103 else
1104 return -EIO;
1105
1106 err = drci_rd_reg(dci_obj->usb_device, reg_addr, &tmp_val);
1107 if (err < 0)
1108 return err;
1109
1110 return snprintf(buf, PAGE_SIZE, "%04x\n", le16_to_cpu(tmp_val));
1111}
1112
1113static ssize_t store_value(struct most_dci_obj *dci_obj,
1114 struct most_dci_attribute *attr,
1115 const char *buf, size_t count)
1116{
1117 u16 v16;
1118 u16 reg_addr;
1119 int err;
1120
1121 if (!strcmp(attr->attr.name, "mep_filter"))
1122 reg_addr = DRCI_REG_MEP_FILTER;
1123 else if (!strcmp(attr->attr.name, "mep_hash0"))
1124 reg_addr = DRCI_REG_HASH_TBL0;
1125 else if (!strcmp(attr->attr.name, "mep_hash1"))
1126 reg_addr = DRCI_REG_HASH_TBL1;
1127 else if (!strcmp(attr->attr.name, "mep_hash2"))
1128 reg_addr = DRCI_REG_HASH_TBL2;
1129 else if (!strcmp(attr->attr.name, "mep_hash3"))
1130 reg_addr = DRCI_REG_HASH_TBL3;
1131 else if (!strcmp(attr->attr.name, "mep_eui48_hi"))
1132 reg_addr = DRCI_REG_HW_ADDR_HI;
1133 else if (!strcmp(attr->attr.name, "mep_eui48_mi"))
1134 reg_addr = DRCI_REG_HW_ADDR_MI;
1135 else if (!strcmp(attr->attr.name, "mep_eui48_lo"))
1136 reg_addr = DRCI_REG_HW_ADDR_LO;
1137 else
1138 return -EIO;
1139
1140 err = kstrtou16(buf, 16, &v16);
1141 if (err)
1142 return err;
1143
1144 err = drci_wr_reg(dci_obj->usb_device, reg_addr, cpu_to_le16(v16));
1145 if (err < 0)
1146 return err;
1147
1148 return count;
1149}
1150
1151static MOST_DCI_RO_ATTR(ni_state);
1152static MOST_DCI_RO_ATTR(packet_bandwidth);
1153static MOST_DCI_RO_ATTR(node_address);
1154static MOST_DCI_RO_ATTR(node_position);
1155static MOST_DCI_ATTR(mep_filter);
1156static MOST_DCI_ATTR(mep_hash0);
1157static MOST_DCI_ATTR(mep_hash1);
1158static MOST_DCI_ATTR(mep_hash2);
1159static MOST_DCI_ATTR(mep_hash3);
1160static MOST_DCI_ATTR(mep_eui48_hi);
1161static MOST_DCI_ATTR(mep_eui48_mi);
1162static MOST_DCI_ATTR(mep_eui48_lo);
1163
1164/**
1165 * most_dci_def_attrs - array of default attribute files of the dci object
1166 */
1167static struct attribute *most_dci_def_attrs[] = {
1168 &most_dci_attr_ni_state.attr,
1169 &most_dci_attr_packet_bandwidth.attr,
1170 &most_dci_attr_node_address.attr,
1171 &most_dci_attr_node_position.attr,
1172 &most_dci_attr_mep_filter.attr,
1173 &most_dci_attr_mep_hash0.attr,
1174 &most_dci_attr_mep_hash1.attr,
1175 &most_dci_attr_mep_hash2.attr,
1176 &most_dci_attr_mep_hash3.attr,
1177 &most_dci_attr_mep_eui48_hi.attr,
1178 &most_dci_attr_mep_eui48_mi.attr,
1179 &most_dci_attr_mep_eui48_lo.attr,
1180 NULL,
1181};
1182
1183/**
1184 * DCI ktype
1185 */
1186static struct kobj_type most_dci_ktype = {
1187 .sysfs_ops = &most_dci_sysfs_ops,
1188 .release = most_dci_release,
1189 .default_attrs = most_dci_def_attrs,
1190};
1191
1192/**
1193 * create_most_dci_obj - allocates a dci object
1194 * @parent: parent kobject
1195 *
1196 * This creates a dci object and registers it with sysfs.
1197 * Returns a pointer to the object or NULL when something went wrong.
1198 */
1199static struct
1200most_dci_obj *create_most_dci_obj(struct kobject *parent)
1201{
1202 struct most_dci_obj *most_dci;
1203 int retval;
1204
1205 most_dci = kzalloc(sizeof(*most_dci), GFP_KERNEL);
1206 if (!most_dci)
1207 return NULL;
1208
1209 retval = kobject_init_and_add(&most_dci->kobj, &most_dci_ktype, parent,
1210 "dci");
1211 if (retval) {
1212 kobject_put(&most_dci->kobj);
1213 return NULL;
1214 }
1215 return most_dci;
1216}
1217
1218/**
1219 * destroy_most_dci_obj - DCI object release function
1220 * @p: pointer to dci object
1221 */
1222static void destroy_most_dci_obj(struct most_dci_obj *p)
1223{
1224 kobject_put(&p->kobj);
1225}
1226
1227/**
1228 * hdm_probe - probe function of USB device driver
1229 * @interface: Interface of the attached USB device
1230 * @id: Pointer to the USB ID table.
1231 *
1232 * This allocates and initializes the device instance, adds the new
1233 * entry to the internal list, scans the USB descriptors and registers
1234 * the interface with the core.
1235 * Additionally, the DCI objects are created and the hardware is sync'd.
1236 *
1237 * Return 0 on success. In case of an error a negative number is returned.
1238 */
1239static int
1240hdm_probe(struct usb_interface *interface, const struct usb_device_id *id)
1241{
1242 unsigned int i;
1243 unsigned int num_endpoints;
1244 struct most_channel_capability *tmp_cap;
1245 struct most_dev *mdev;
1246 struct usb_device *usb_dev;
59ed0480 1247 struct device *dev;
a4198cdf
CG		 1248 struct usb_host_interface *usb_iface_desc;
1249 struct usb_endpoint_descriptor *ep_desc;
1250 int ret = 0;
1251
1252 usb_iface_desc = interface->cur_altsetting;
1253 usb_dev = interface_to_usbdev(interface);
59ed0480 1254 dev = &usb_dev->dev;
a4198cdf
CG		 1255 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
1256 if (!mdev)
1257 goto exit_ENOMEM;
1258
1259 usb_set_intfdata(interface, mdev);
1260 num_endpoints = usb_iface_desc->desc.bNumEndpoints;
1261 mutex_init(&mdev->io_mutex);
1262 INIT_WORK(&mdev->poll_work_obj, wq_netinfo);
1263 init_timer(&mdev->link_stat_timer);
1264
1265 mdev->usb_device = usb_dev;
1266 mdev->link_stat_timer.function = link_stat_timer_handler;
1267 mdev->link_stat_timer.data = (unsigned long)mdev;
1268 mdev->link_stat_timer.expires = jiffies + (2 * HZ);
1269
1270 mdev->iface.mod = hdm_usb_fops.owner;
1271 mdev->iface.interface = ITYPE_USB;
1272 mdev->iface.configure = hdm_configure_channel;
1273 mdev->iface.request_netinfo = hdm_request_netinfo;
1274 mdev->iface.enqueue = hdm_enqueue;
1275 mdev->iface.poison_channel = hdm_poison_channel;
1276 mdev->iface.description = mdev->description;
1277 mdev->iface.num_channels = num_endpoints;
1278
1279 snprintf(mdev->description, sizeof(mdev->description),
1280 "usb_device %d-%s:%d.%d",
1281 usb_dev->bus->busnum,
1282 usb_dev->devpath,
1283 usb_dev->config->desc.bConfigurationValue,
1284 usb_iface_desc->desc.bInterfaceNumber);
1285
1286 mdev->conf = kcalloc(num_endpoints, sizeof(*mdev->conf), GFP_KERNEL);
1287 if (!mdev->conf)
1288 goto exit_free;
1289
1290 mdev->cap = kcalloc(num_endpoints, sizeof(*mdev->cap), GFP_KERNEL);
1291 if (!mdev->cap)
1292 goto exit_free1;
1293
1294 mdev->iface.channel_vector = mdev->cap;
1295 mdev->iface.priv = NULL;
1296
1297 mdev->ep_address =
1298 kcalloc(num_endpoints, sizeof(*mdev->ep_address), GFP_KERNEL);
1299 if (!mdev->ep_address)
1300 goto exit_free2;
1301
1302 mdev->anchor_list =
1303 kcalloc(num_endpoints, sizeof(*mdev->anchor_list), GFP_KERNEL);
1304 if (!mdev->anchor_list)
1305 goto exit_free3;
1306
1307 tmp_cap = mdev->cap;
1308 for (i = 0; i < num_endpoints; i++) {
1309 ep_desc = &usb_iface_desc->endpoint[i].desc;
1310 mdev->ep_address[i] = ep_desc->bEndpointAddress;
1311 mdev->padding_active[i] = false;
1312 mdev->is_channel_healthy[i] = true;
1313
1314 snprintf(&mdev->suffix[i][0], MAX_SUFFIX_LEN, "ep%02x",
1315 mdev->ep_address[i]);
1316
1317 tmp_cap->name_suffix = &mdev->suffix[i][0];
1318 tmp_cap->buffer_size_packet = MAX_BUF_SIZE;
1319 tmp_cap->buffer_size_streaming = MAX_BUF_SIZE;
1320 tmp_cap->num_buffers_packet = BUF_CHAIN_SIZE;
1321 tmp_cap->num_buffers_streaming = BUF_CHAIN_SIZE;
1322 tmp_cap->data_type = MOST_CH_CONTROL | MOST_CH_ASYNC |
1323 MOST_CH_ISOC_AVP | MOST_CH_SYNC;
1324 if (ep_desc->bEndpointAddress & USB_DIR_IN)
1325 tmp_cap->direction = MOST_CH_RX;
1326 else
1327 tmp_cap->direction = MOST_CH_TX;
1328 tmp_cap++;
1329 INIT_LIST_HEAD(&mdev->anchor_list[i]);
1330 spin_lock_init(&mdev->anchor_list_lock[i]);
1331 }
59ed0480
CG		 1332 dev_notice(dev, "claimed gadget: Vendor=%4.4x ProdID=%4.4x Bus=%02x Device=%02x\n",
1333 le16_to_cpu(usb_dev->descriptor.idVendor),
1334 le16_to_cpu(usb_dev->descriptor.idProduct),
1335 usb_dev->bus->busnum,
1336 usb_dev->devnum);
1337
1338 dev_notice(dev, "device path: /sys/bus/usb/devices/%d-%s:%d.%d\n",
1339 usb_dev->bus->busnum,
1340 usb_dev->devpath,
1341 usb_dev->config->desc.bConfigurationValue,
1342 usb_iface_desc->desc.bInterfaceNumber);
a4198cdf
CG		 1343
1344 mdev->parent = most_register_interface(&mdev->iface);
1345 if (IS_ERR(mdev->parent)) {
1346 ret = PTR_ERR(mdev->parent);
1347 goto exit_free4;
1348 }
1349
1350 mutex_lock(&mdev->io_mutex);
1351 if (le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_INIC) {
1352 /* this increments the reference count of the instance
1353 * object of the core
1354 */
1355 mdev->dci = create_most_dci_obj(mdev->parent);
1356 if (!mdev->dci) {
1357 mutex_unlock(&mdev->io_mutex);
1358 most_deregister_interface(&mdev->iface);
1359 ret = -ENOMEM;
1360 goto exit_free4;
1361 }
1362
1363 kobject_uevent(&mdev->dci->kobj, KOBJ_ADD);
1364 mdev->dci->usb_device = mdev->usb_device;
1365 trigger_resync_vr(usb_dev);
1366 }
1367 mutex_unlock(&mdev->io_mutex);
1368 return 0;
1369
1370exit_free4:
1371 kfree(mdev->anchor_list);
1372exit_free3:
1373 kfree(mdev->ep_address);
1374exit_free2:
1375 kfree(mdev->cap);
1376exit_free1:
1377 kfree(mdev->conf);
1378exit_free:
1379 kfree(mdev);
1380exit_ENOMEM:
1381 if (ret == 0 || ret == -ENOMEM) {
1382 ret = -ENOMEM;
59ed0480 1383 dev_err(dev, "out of memory\n");
a4198cdf
CG		 1384 }
1385 return ret;
1386}
1387
1388/**
1389 * hdm_disconnect - disconnect function of USB device driver
1390 * @interface: Interface of the attached USB device
1391 *
1392 * This deregisters the interface with the core, removes the kernel timer
1393 * and frees resources.
1394 *
1395 * Context: hub kernel thread
1396 */
1397static void hdm_disconnect(struct usb_interface *interface)
1398{
1399 struct most_dev *mdev;
1400
1401 mdev = usb_get_intfdata(interface);
a4198cdf
CG		 1402 mutex_lock(&mdev->io_mutex);
1403 usb_set_intfdata(interface, NULL);
1404 mdev->usb_device = NULL;
1405 mutex_unlock(&mdev->io_mutex);
1406
1407 del_timer_sync(&mdev->link_stat_timer);
1408 cancel_work_sync(&mdev->poll_work_obj);
1409
1410 destroy_most_dci_obj(mdev->dci);
1411 most_deregister_interface(&mdev->iface);
1412
1413 kfree(mdev->anchor_list);
1414 kfree(mdev->cap);
1415 kfree(mdev->conf);
1416 kfree(mdev->ep_address);
1417 kfree(mdev);
1418}
1419
1420static struct usb_driver hdm_usb = {
1421 .name = "hdm_usb",
1422 .id_table = usbid,
1423 .probe = hdm_probe,
1424 .disconnect = hdm_disconnect,
1425};
1426
1427static int __init hdm_usb_init(void)
1428{
1429 pr_info("hdm_usb_init()\n");
1430 if (usb_register(&hdm_usb)) {
59ed0480 1431 pr_err("could not register hdm_usb driver\n");
a4198cdf
CG		 1432 return -EIO;
1433 }
1434 schedule_usb_work = create_workqueue("hdmu_work");
1435 if (schedule_usb_work == NULL) {
59ed0480 1436 pr_err("could not create workqueue\n");
a4198cdf
CG		 1437 usb_deregister(&hdm_usb);
1438 return -ENOMEM;
1439 }
1440 return 0;
1441}
1442
1443static void __exit hdm_usb_exit(void)
1444{
1445 pr_info("hdm_usb_exit()\n");
1446 destroy_workqueue(schedule_usb_work);
1447 usb_deregister(&hdm_usb);
1448}
1449
1450module_init(hdm_usb_init);
1451module_exit(hdm_usb_exit);
1452MODULE_LICENSE("GPL");
1453MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>");
1454MODULE_DESCRIPTION("HDM_4_USB");
Linux 6.x block layer and io_uring tree(s)