1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * usb.c - Hardware dependent module for USB |
4 | * |
5 | * Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG |
6 | */ |
7 | |
8 | #include <linux/module.h> |
9 | #include <linux/fs.h> |
10 | #include <linux/usb.h> |
11 | #include <linux/slab.h> |
12 | #include <linux/init.h> |
13 | #include <linux/cdev.h> |
14 | #include <linux/device.h> |
15 | #include <linux/list.h> |
16 | #include <linux/completion.h> |
17 | #include <linux/mutex.h> |
18 | #include <linux/spinlock.h> |
19 | #include <linux/interrupt.h> |
20 | #include <linux/workqueue.h> |
21 | #include <linux/sysfs.h> |
22 | #include <linux/dma-mapping.h> |
23 | #include <linux/etherdevice.h> |
24 | #include <linux/uaccess.h> |
25 | #include <linux/most.h> |
26 | |
27 | #define USB_MTU 512 |
28 | #define NO_ISOCHRONOUS_URB 0 |
29 | #define AV_PACKETS_PER_XACT 2 |
30 | #define BUF_CHAIN_SIZE 0xFFFF |
31 | #define MAX_NUM_ENDPOINTS 30 |
32 | #define MAX_SUFFIX_LEN 10 |
33 | #define MAX_STRING_LEN 80 |
34 | #define MAX_BUF_SIZE 0xFFFF |
35 | |
36 | #define USB_VENDOR_ID_SMSC 0x0424 /* VID: SMSC */ |
37 | #define USB_DEV_ID_BRDG 0xC001 /* PID: USB Bridge */ |
38 | #define USB_DEV_ID_OS81118 0xCF18 /* PID: USB OS81118 */ |
39 | #define USB_DEV_ID_OS81119 0xCF19 /* PID: USB OS81119 */ |
40 | #define USB_DEV_ID_OS81210 0xCF30 /* PID: USB OS81210 */ |
41 | /* DRCI Addresses */ |
42 | #define DRCI_REG_NI_STATE 0x0100 |
43 | #define DRCI_REG_PACKET_BW 0x0101 |
44 | #define DRCI_REG_NODE_ADDR 0x0102 |
45 | #define DRCI_REG_NODE_POS 0x0103 |
46 | #define DRCI_REG_MEP_FILTER 0x0140 |
47 | #define DRCI_REG_HASH_TBL0 0x0141 |
48 | #define DRCI_REG_HASH_TBL1 0x0142 |
49 | #define DRCI_REG_HASH_TBL2 0x0143 |
50 | #define DRCI_REG_HASH_TBL3 0x0144 |
51 | #define DRCI_REG_HW_ADDR_HI 0x0145 |
52 | #define DRCI_REG_HW_ADDR_MI 0x0146 |
53 | #define DRCI_REG_HW_ADDR_LO 0x0147 |
54 | #define DRCI_REG_BASE 0x1100 |
55 | #define DRCI_COMMAND 0x02 |
56 | #define DRCI_READ_REQ 0xA0 |
57 | #define DRCI_WRITE_REQ 0xA1 |
58 | |
59 | /** |
60 | * struct most_dci_obj - Direct Communication Interface |
61 | * @kobj:position in sysfs |
62 | * @usb_device: pointer to the usb device |
63 | * @reg_addr: register address for arbitrary DCI access |
64 | */ |
65 | struct most_dci_obj { |
66 | struct device dev; |
67 | struct usb_device *usb_device; |
68 | u16 reg_addr; |
69 | }; |
70 | |
71 | #define to_dci_obj(p) container_of(p, struct most_dci_obj, dev) |
72 | |
73 | struct most_dev; |
74 | |
75 | struct clear_hold_work { |
76 | struct work_struct ws; |
77 | struct most_dev *mdev; |
78 | unsigned int channel; |
79 | int pipe; |
80 | }; |
81 | |
82 | #define to_clear_hold_work(w) container_of(w, struct clear_hold_work, ws) |
83 | |
84 | /** |
85 | * struct most_dev - holds all usb interface specific stuff |
86 | * @usb_device: pointer to usb device |
87 | * @iface: hardware interface |
88 | * @cap: channel capabilities |
89 | * @conf: channel configuration |
90 | * @dci: direct communication interface of hardware |
91 | * @ep_address: endpoint address table |
92 | * @description: device description |
93 | * @suffix: suffix for channel name |
94 | * @channel_lock: synchronize channel access |
95 | * @padding_active: indicates channel uses padding |
96 | * @is_channel_healthy: health status table of each channel |
97 | * @busy_urbs: list of anchored items |
98 | * @io_mutex: synchronize I/O with disconnect |
99 | * @link_stat_timer: timer for link status reports |
100 | * @poll_work_obj: work for polling link status |
101 | */ |
102 | struct most_dev { |
103 | struct device dev; |
104 | struct usb_device *usb_device; |
105 | struct most_interface iface; |
106 | struct most_channel_capability *cap; |
107 | struct most_channel_config *conf; |
108 | struct most_dci_obj *dci; |
109 | u8 *ep_address; |
110 | char description[MAX_STRING_LEN]; |
111 | char suffix[MAX_NUM_ENDPOINTS][MAX_SUFFIX_LEN]; |
112 | spinlock_t channel_lock[MAX_NUM_ENDPOINTS]; /* sync channel access */ |
113 | bool padding_active[MAX_NUM_ENDPOINTS]; |
114 | bool is_channel_healthy[MAX_NUM_ENDPOINTS]; |
115 | struct clear_hold_work clear_work[MAX_NUM_ENDPOINTS]; |
116 | struct usb_anchor *busy_urbs; |
117 | struct mutex io_mutex; |
118 | struct timer_list link_stat_timer; |
119 | struct work_struct poll_work_obj; |
120 | void (*on_netinfo)(struct most_interface *most_iface, |
121 | unsigned char link_state, unsigned char *addrs); |
122 | }; |
123 | |
124 | #define to_mdev(d) container_of(d, struct most_dev, iface) |
125 | #define to_mdev_from_dev(d) container_of(d, struct most_dev, dev) |
126 | #define to_mdev_from_work(w) container_of(w, struct most_dev, poll_work_obj) |
127 | |
128 | static void wq_clear_halt(struct work_struct *wq_obj); |
129 | static void wq_netinfo(struct work_struct *wq_obj); |
130 | |
131 | /** |
132 | * drci_rd_reg - read a DCI register |
133 | * @dev: usb device |
134 | * @reg: register address |
135 | * @buf: buffer to store data |
136 | * |
137 | * This is reads data from INIC's direct register communication interface |
138 | */ |
139 | static inline int drci_rd_reg(struct usb_device *dev, u16 reg, u16 *buf) |
140 | { |
141 | int retval; |
142 | __le16 *dma_buf; |
143 | u8 req_type = USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE; |
144 | |
145 | dma_buf = kzalloc(size: sizeof(*dma_buf), GFP_KERNEL); |
146 | if (!dma_buf) |
147 | return -ENOMEM; |
148 | |
149 | retval = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), |
150 | DRCI_READ_REQ, requesttype: req_type, |
151 | value: 0x0000, |
152 | index: reg, data: dma_buf, size: sizeof(*dma_buf), |
153 | USB_CTRL_GET_TIMEOUT); |
154 | *buf = le16_to_cpu(*dma_buf); |
155 | kfree(objp: dma_buf); |
156 | |
157 | if (retval < 0) |
158 | return retval; |
159 | return 0; |
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 | */ |
170 | static 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 | value: data, |
177 | index: reg, |
178 | NULL, |
179 | size: 0, |
180 | USB_CTRL_SET_TIMEOUT); |
181 | } |
182 | |
183 | static inline int start_sync_ep(struct usb_device *usb_dev, u16 ep) |
184 | { |
185 | return drci_wr_reg(dev: usb_dev, DRCI_REG_BASE + DRCI_COMMAND + ep * 16, data: 1); |
186 | } |
187 | |
188 | /** |
189 | * get_stream_frame_size - calculate frame size of current configuration |
190 | * @dev: device structure |
191 | * @cfg: channel configuration |
192 | */ |
193 | static unsigned int get_stream_frame_size(struct device *dev, |
194 | struct most_channel_config *cfg) |
195 | { |
196 | unsigned int frame_size; |
197 | unsigned int sub_size = cfg->subbuffer_size; |
198 | |
199 | if (!sub_size) { |
200 | dev_warn(dev, "Misconfig: Subbuffer size zero.\n" ); |
201 | return 0; |
202 | } |
203 | switch (cfg->data_type) { |
204 | case MOST_CH_ISOC: |
205 | frame_size = AV_PACKETS_PER_XACT * sub_size; |
206 | break; |
207 | case MOST_CH_SYNC: |
208 | if (cfg->packets_per_xact == 0) { |
209 | dev_warn(dev, "Misconfig: Packets per XACT zero\n" ); |
210 | frame_size = 0; |
211 | } else if (cfg->packets_per_xact == 0xFF) { |
212 | frame_size = (USB_MTU / sub_size) * sub_size; |
213 | } else { |
214 | frame_size = cfg->packets_per_xact * sub_size; |
215 | } |
216 | break; |
217 | default: |
218 | dev_warn(dev, "Query frame size of non-streaming channel\n" ); |
219 | frame_size = 0; |
220 | break; |
221 | } |
222 | return frame_size; |
223 | } |
224 | |
225 | /** |
226 | * hdm_poison_channel - mark buffers of this channel as invalid |
227 | * @iface: pointer to the interface |
228 | * @channel: channel ID |
229 | * |
230 | * This unlinks all URBs submitted to the HCD, |
231 | * calls the associated completion function of the core and removes |
232 | * them from the list. |
233 | * |
234 | * Returns 0 on success or error code otherwise. |
235 | */ |
236 | static int hdm_poison_channel(struct most_interface *iface, int channel) |
237 | { |
238 | struct most_dev *mdev = to_mdev(iface); |
239 | unsigned long flags; |
240 | spinlock_t *lock; /* temp. lock */ |
241 | |
242 | if (channel < 0 || channel >= iface->num_channels) { |
243 | dev_warn(&mdev->usb_device->dev, "Channel ID out of range.\n" ); |
244 | return -ECHRNG; |
245 | } |
246 | |
247 | lock = mdev->channel_lock + channel; |
248 | spin_lock_irqsave(lock, flags); |
249 | mdev->is_channel_healthy[channel] = false; |
250 | spin_unlock_irqrestore(lock, flags); |
251 | |
252 | cancel_work_sync(work: &mdev->clear_work[channel].ws); |
253 | |
254 | mutex_lock(&mdev->io_mutex); |
255 | usb_kill_anchored_urbs(anchor: &mdev->busy_urbs[channel]); |
256 | if (mdev->padding_active[channel]) |
257 | mdev->padding_active[channel] = false; |
258 | |
259 | if (mdev->conf[channel].data_type == MOST_CH_ASYNC) { |
260 | del_timer_sync(timer: &mdev->link_stat_timer); |
261 | cancel_work_sync(work: &mdev->poll_work_obj); |
262 | } |
263 | mutex_unlock(lock: &mdev->io_mutex); |
264 | return 0; |
265 | } |
266 | |
267 | /** |
268 | * hdm_add_padding - add padding bytes |
269 | * @mdev: most device |
270 | * @channel: channel ID |
271 | * @mbo: buffer object |
272 | * |
273 | * This inserts the INIC hardware specific padding bytes into a streaming |
274 | * channel's buffer |
275 | */ |
276 | static int hdm_add_padding(struct most_dev *mdev, int channel, struct mbo *mbo) |
277 | { |
278 | struct most_channel_config *conf = &mdev->conf[channel]; |
279 | unsigned int frame_size = get_stream_frame_size(dev: &mdev->dev, cfg: conf); |
280 | unsigned int j, num_frames; |
281 | |
282 | if (!frame_size) |
283 | return -EINVAL; |
284 | num_frames = mbo->buffer_length / frame_size; |
285 | |
286 | if (num_frames < 1) { |
287 | dev_err(&mdev->usb_device->dev, |
288 | "Missed minimal transfer unit.\n" ); |
289 | return -EINVAL; |
290 | } |
291 | |
292 | for (j = num_frames - 1; j > 0; j--) |
293 | memmove(mbo->virt_address + j * USB_MTU, |
294 | mbo->virt_address + j * frame_size, |
295 | frame_size); |
296 | mbo->buffer_length = num_frames * USB_MTU; |
297 | return 0; |
298 | } |
299 | |
300 | /** |
301 | * hdm_remove_padding - remove padding bytes |
302 | * @mdev: most device |
303 | * @channel: channel ID |
304 | * @mbo: buffer object |
305 | * |
306 | * This takes the INIC hardware specific padding bytes off a streaming |
307 | * channel's buffer. |
308 | */ |
309 | static int hdm_remove_padding(struct most_dev *mdev, int channel, |
310 | struct mbo *mbo) |
311 | { |
312 | struct most_channel_config *const conf = &mdev->conf[channel]; |
313 | unsigned int frame_size = get_stream_frame_size(dev: &mdev->dev, cfg: conf); |
314 | unsigned int j, num_frames; |
315 | |
316 | if (!frame_size) |
317 | return -EINVAL; |
318 | num_frames = mbo->processed_length / USB_MTU; |
319 | |
320 | for (j = 1; j < num_frames; j++) |
321 | memmove(mbo->virt_address + frame_size * j, |
322 | mbo->virt_address + USB_MTU * j, |
323 | frame_size); |
324 | |
325 | mbo->processed_length = frame_size * num_frames; |
326 | return 0; |
327 | } |
328 | |
329 | /** |
330 | * hdm_write_completion - completion function for submitted Tx URBs |
331 | * @urb: the URB that has been completed |
332 | * |
333 | * This checks the status of the completed URB. In case the URB has been |
334 | * unlinked before, it is immediately freed. On any other error the MBO |
335 | * transfer flag is set. On success it frees allocated resources and calls |
336 | * the completion function. |
337 | * |
338 | * Context: interrupt! |
339 | */ |
340 | static void hdm_write_completion(struct urb *urb) |
341 | { |
342 | struct mbo *mbo = urb->context; |
343 | struct most_dev *mdev = to_mdev(mbo->ifp); |
344 | unsigned int channel = mbo->hdm_channel_id; |
345 | spinlock_t *lock = mdev->channel_lock + channel; |
346 | unsigned long flags; |
347 | |
348 | spin_lock_irqsave(lock, flags); |
349 | |
350 | mbo->processed_length = 0; |
351 | mbo->status = MBO_E_INVAL; |
352 | if (likely(mdev->is_channel_healthy[channel])) { |
353 | switch (urb->status) { |
354 | case 0: |
355 | case -ESHUTDOWN: |
356 | mbo->processed_length = urb->actual_length; |
357 | mbo->status = MBO_SUCCESS; |
358 | break; |
359 | case -EPIPE: |
360 | dev_warn(&mdev->usb_device->dev, |
361 | "Broken pipe on ep%02x\n" , |
362 | mdev->ep_address[channel]); |
363 | mdev->is_channel_healthy[channel] = false; |
364 | mdev->clear_work[channel].pipe = urb->pipe; |
365 | schedule_work(work: &mdev->clear_work[channel].ws); |
366 | break; |
367 | case -ENODEV: |
368 | case -EPROTO: |
369 | mbo->status = MBO_E_CLOSE; |
370 | break; |
371 | } |
372 | } |
373 | |
374 | spin_unlock_irqrestore(lock, flags); |
375 | |
376 | if (likely(mbo->complete)) |
377 | mbo->complete(mbo); |
378 | usb_free_urb(urb); |
379 | } |
380 | |
381 | /** |
382 | * hdm_read_completion - completion function for submitted Rx URBs |
383 | * @urb: the URB that has been completed |
384 | * |
385 | * This checks the status of the completed URB. In case the URB has been |
386 | * unlinked before it is immediately freed. On any other error the MBO transfer |
387 | * flag is set. On success it frees allocated resources, removes |
388 | * padding bytes -if necessary- and calls the completion function. |
389 | * |
390 | * Context: interrupt! |
391 | */ |
392 | static void hdm_read_completion(struct urb *urb) |
393 | { |
394 | struct mbo *mbo = urb->context; |
395 | struct most_dev *mdev = to_mdev(mbo->ifp); |
396 | unsigned int channel = mbo->hdm_channel_id; |
397 | struct device *dev = &mdev->usb_device->dev; |
398 | spinlock_t *lock = mdev->channel_lock + channel; |
399 | unsigned long flags; |
400 | |
401 | spin_lock_irqsave(lock, flags); |
402 | |
403 | mbo->processed_length = 0; |
404 | mbo->status = MBO_E_INVAL; |
405 | if (likely(mdev->is_channel_healthy[channel])) { |
406 | switch (urb->status) { |
407 | case 0: |
408 | case -ESHUTDOWN: |
409 | mbo->processed_length = urb->actual_length; |
410 | mbo->status = MBO_SUCCESS; |
411 | if (mdev->padding_active[channel] && |
412 | hdm_remove_padding(mdev, channel, mbo)) { |
413 | mbo->processed_length = 0; |
414 | mbo->status = MBO_E_INVAL; |
415 | } |
416 | break; |
417 | case -EPIPE: |
418 | dev_warn(dev, "Broken pipe on ep%02x\n" , |
419 | mdev->ep_address[channel]); |
420 | mdev->is_channel_healthy[channel] = false; |
421 | mdev->clear_work[channel].pipe = urb->pipe; |
422 | schedule_work(work: &mdev->clear_work[channel].ws); |
423 | break; |
424 | case -ENODEV: |
425 | case -EPROTO: |
426 | mbo->status = MBO_E_CLOSE; |
427 | break; |
428 | case -EOVERFLOW: |
429 | dev_warn(dev, "Babble on ep%02x\n" , |
430 | mdev->ep_address[channel]); |
431 | break; |
432 | } |
433 | } |
434 | |
435 | spin_unlock_irqrestore(lock, flags); |
436 | |
437 | if (likely(mbo->complete)) |
438 | mbo->complete(mbo); |
439 | usb_free_urb(urb); |
440 | } |
441 | |
442 | /** |
443 | * hdm_enqueue - receive a buffer to be used for data transfer |
444 | * @iface: interface to enqueue to |
445 | * @channel: ID of the channel |
446 | * @mbo: pointer to the buffer object |
447 | * |
448 | * This allocates a new URB and fills it according to the channel |
449 | * that is being used for transmission of data. Before the URB is |
450 | * submitted it is stored in the private anchor list. |
451 | * |
452 | * Returns 0 on success. On any error the URB is freed and a error code |
453 | * is returned. |
454 | * |
455 | * Context: Could in _some_ cases be interrupt! |
456 | */ |
457 | static int hdm_enqueue(struct most_interface *iface, int channel, |
458 | struct mbo *mbo) |
459 | { |
460 | struct most_dev *mdev = to_mdev(iface); |
461 | struct most_channel_config *conf; |
462 | int retval = 0; |
463 | struct urb *urb; |
464 | unsigned long length; |
465 | void *virt_address; |
466 | |
467 | if (!mbo) |
468 | return -EINVAL; |
469 | if (iface->num_channels <= channel || channel < 0) |
470 | return -ECHRNG; |
471 | |
472 | urb = usb_alloc_urb(NO_ISOCHRONOUS_URB, GFP_KERNEL); |
473 | if (!urb) |
474 | return -ENOMEM; |
475 | |
476 | conf = &mdev->conf[channel]; |
477 | |
478 | mutex_lock(&mdev->io_mutex); |
479 | if (!mdev->usb_device) { |
480 | retval = -ENODEV; |
481 | goto err_free_urb; |
482 | } |
483 | |
484 | if ((conf->direction & MOST_CH_TX) && mdev->padding_active[channel] && |
485 | hdm_add_padding(mdev, channel, mbo)) { |
486 | retval = -EINVAL; |
487 | goto err_free_urb; |
488 | } |
489 | |
490 | urb->transfer_dma = mbo->bus_address; |
491 | virt_address = mbo->virt_address; |
492 | length = mbo->buffer_length; |
493 | |
494 | if (conf->direction & MOST_CH_TX) { |
495 | usb_fill_bulk_urb(urb, dev: mdev->usb_device, |
496 | usb_sndbulkpipe(mdev->usb_device, |
497 | mdev->ep_address[channel]), |
498 | transfer_buffer: virt_address, |
499 | buffer_length: length, |
500 | complete_fn: hdm_write_completion, |
501 | context: mbo); |
502 | if (conf->data_type != MOST_CH_ISOC && |
503 | conf->data_type != MOST_CH_SYNC) |
504 | urb->transfer_flags |= URB_ZERO_PACKET; |
505 | } else { |
506 | usb_fill_bulk_urb(urb, dev: mdev->usb_device, |
507 | usb_rcvbulkpipe(mdev->usb_device, |
508 | mdev->ep_address[channel]), |
509 | transfer_buffer: virt_address, |
510 | buffer_length: length + conf->extra_len, |
511 | complete_fn: hdm_read_completion, |
512 | context: mbo); |
513 | } |
514 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
515 | |
516 | usb_anchor_urb(urb, anchor: &mdev->busy_urbs[channel]); |
517 | |
518 | retval = usb_submit_urb(urb, GFP_KERNEL); |
519 | if (retval) { |
520 | dev_err(&mdev->usb_device->dev, |
521 | "URB submit failed with error %d.\n" , retval); |
522 | goto err_unanchor_urb; |
523 | } |
524 | mutex_unlock(lock: &mdev->io_mutex); |
525 | return 0; |
526 | |
527 | err_unanchor_urb: |
528 | usb_unanchor_urb(urb); |
529 | err_free_urb: |
530 | usb_free_urb(urb); |
531 | mutex_unlock(lock: &mdev->io_mutex); |
532 | return retval; |
533 | } |
534 | |
535 | static void *hdm_dma_alloc(struct mbo *mbo, u32 size) |
536 | { |
537 | struct most_dev *mdev = to_mdev(mbo->ifp); |
538 | |
539 | return usb_alloc_coherent(dev: mdev->usb_device, size, GFP_KERNEL, |
540 | dma: &mbo->bus_address); |
541 | } |
542 | |
543 | static void hdm_dma_free(struct mbo *mbo, u32 size) |
544 | { |
545 | struct most_dev *mdev = to_mdev(mbo->ifp); |
546 | |
547 | usb_free_coherent(dev: mdev->usb_device, size, addr: mbo->virt_address, |
548 | dma: mbo->bus_address); |
549 | } |
550 | |
551 | /** |
552 | * hdm_configure_channel - receive channel configuration from core |
553 | * @iface: interface |
554 | * @channel: channel ID |
555 | * @conf: structure that holds the configuration information |
556 | * |
557 | * The attached network interface controller (NIC) supports a padding mode |
558 | * to avoid short packets on USB, hence increasing the performance due to a |
559 | * lower interrupt load. This mode is default for synchronous data and can |
560 | * be switched on for isochronous data. In case padding is active the |
561 | * driver needs to know the frame size of the payload in order to calculate |
562 | * the number of bytes it needs to pad when transmitting or to cut off when |
563 | * receiving data. |
564 | * |
565 | */ |
566 | static int hdm_configure_channel(struct most_interface *iface, int channel, |
567 | struct most_channel_config *conf) |
568 | { |
569 | unsigned int num_frames; |
570 | unsigned int frame_size; |
571 | struct most_dev *mdev = to_mdev(iface); |
572 | struct device *dev = &mdev->usb_device->dev; |
573 | |
574 | if (!conf) { |
575 | dev_err(dev, "Bad config pointer.\n" ); |
576 | return -EINVAL; |
577 | } |
578 | if (channel < 0 || channel >= iface->num_channels) { |
579 | dev_err(dev, "Channel ID out of range.\n" ); |
580 | return -EINVAL; |
581 | } |
582 | |
583 | mdev->is_channel_healthy[channel] = true; |
584 | mdev->clear_work[channel].channel = channel; |
585 | mdev->clear_work[channel].mdev = mdev; |
586 | INIT_WORK(&mdev->clear_work[channel].ws, wq_clear_halt); |
587 | |
588 | if (!conf->num_buffers || !conf->buffer_size) { |
589 | dev_err(dev, "Misconfig: buffer size or #buffers zero.\n" ); |
590 | return -EINVAL; |
591 | } |
592 | |
593 | if (conf->data_type != MOST_CH_SYNC && |
594 | !(conf->data_type == MOST_CH_ISOC && |
595 | conf->packets_per_xact != 0xFF)) { |
596 | mdev->padding_active[channel] = false; |
597 | /* |
598 | * Since the NIC's padding mode is not going to be |
599 | * used, we can skip the frame size calculations and |
600 | * move directly on to exit. |
601 | */ |
602 | goto exit; |
603 | } |
604 | |
605 | mdev->padding_active[channel] = true; |
606 | |
607 | frame_size = get_stream_frame_size(dev: &mdev->dev, cfg: conf); |
608 | if (frame_size == 0 || frame_size > USB_MTU) { |
609 | dev_warn(dev, "Misconfig: frame size wrong\n" ); |
610 | return -EINVAL; |
611 | } |
612 | |
613 | num_frames = conf->buffer_size / frame_size; |
614 | |
615 | if (conf->buffer_size % frame_size) { |
616 | u16 old_size = conf->buffer_size; |
617 | |
618 | conf->buffer_size = num_frames * frame_size; |
619 | dev_warn(dev, "%s: fixed buffer size (%d -> %d)\n" , |
620 | mdev->suffix[channel], old_size, conf->buffer_size); |
621 | } |
622 | |
623 | /* calculate extra length to comply w/ HW padding */ |
624 | conf->extra_len = num_frames * (USB_MTU - frame_size); |
625 | |
626 | exit: |
627 | mdev->conf[channel] = *conf; |
628 | if (conf->data_type == MOST_CH_ASYNC) { |
629 | u16 ep = mdev->ep_address[channel]; |
630 | |
631 | if (start_sync_ep(usb_dev: mdev->usb_device, ep) < 0) |
632 | dev_warn(dev, "sync for ep%02x failed" , ep); |
633 | } |
634 | return 0; |
635 | } |
636 | |
637 | /** |
638 | * hdm_request_netinfo - request network information |
639 | * @iface: pointer to interface |
640 | * @channel: channel ID |
641 | * |
642 | * This is used as trigger to set up the link status timer that |
643 | * polls for the NI state of the INIC every 2 seconds. |
644 | * |
645 | */ |
646 | static void hdm_request_netinfo(struct most_interface *iface, int channel, |
647 | void (*on_netinfo)(struct most_interface *, |
648 | unsigned char, |
649 | unsigned char *)) |
650 | { |
651 | struct most_dev *mdev = to_mdev(iface); |
652 | |
653 | mdev->on_netinfo = on_netinfo; |
654 | if (!on_netinfo) |
655 | return; |
656 | |
657 | mdev->link_stat_timer.expires = jiffies + HZ; |
658 | mod_timer(timer: &mdev->link_stat_timer, expires: mdev->link_stat_timer.expires); |
659 | } |
660 | |
661 | /** |
662 | * link_stat_timer_handler - schedule work obtaining mac address and link status |
663 | * @t: pointer to timer_list which holds a pointer to the USB device instance |
664 | * |
665 | * The handler runs in interrupt context. That's why we need to defer the |
666 | * tasks to a work queue. |
667 | */ |
668 | static void link_stat_timer_handler(struct timer_list *t) |
669 | { |
670 | struct most_dev *mdev = from_timer(mdev, t, link_stat_timer); |
671 | |
672 | schedule_work(work: &mdev->poll_work_obj); |
673 | mdev->link_stat_timer.expires = jiffies + (2 * HZ); |
674 | add_timer(timer: &mdev->link_stat_timer); |
675 | } |
676 | |
677 | /** |
678 | * wq_netinfo - work queue function to deliver latest networking information |
679 | * @wq_obj: object that holds data for our deferred work to do |
680 | * |
681 | * This retrieves the network interface status of the USB INIC |
682 | */ |
683 | static void wq_netinfo(struct work_struct *wq_obj) |
684 | { |
685 | struct most_dev *mdev = to_mdev_from_work(wq_obj); |
686 | struct usb_device *usb_device = mdev->usb_device; |
687 | struct device *dev = &usb_device->dev; |
688 | u16 hi, mi, lo, link; |
689 | u8 hw_addr[6]; |
690 | |
691 | if (drci_rd_reg(dev: usb_device, DRCI_REG_HW_ADDR_HI, buf: &hi)) { |
692 | dev_err(dev, "Vendor request 'hw_addr_hi' failed\n" ); |
693 | return; |
694 | } |
695 | |
696 | if (drci_rd_reg(dev: usb_device, DRCI_REG_HW_ADDR_MI, buf: &mi)) { |
697 | dev_err(dev, "Vendor request 'hw_addr_mid' failed\n" ); |
698 | return; |
699 | } |
700 | |
701 | if (drci_rd_reg(dev: usb_device, DRCI_REG_HW_ADDR_LO, buf: &lo)) { |
702 | dev_err(dev, "Vendor request 'hw_addr_low' failed\n" ); |
703 | return; |
704 | } |
705 | |
706 | if (drci_rd_reg(dev: usb_device, DRCI_REG_NI_STATE, buf: &link)) { |
707 | dev_err(dev, "Vendor request 'link status' failed\n" ); |
708 | return; |
709 | } |
710 | |
711 | hw_addr[0] = hi >> 8; |
712 | hw_addr[1] = hi; |
713 | hw_addr[2] = mi >> 8; |
714 | hw_addr[3] = mi; |
715 | hw_addr[4] = lo >> 8; |
716 | hw_addr[5] = lo; |
717 | |
718 | if (mdev->on_netinfo) |
719 | mdev->on_netinfo(&mdev->iface, link, hw_addr); |
720 | } |
721 | |
722 | /** |
723 | * wq_clear_halt - work queue function |
724 | * @wq_obj: work_struct object to execute |
725 | * |
726 | * This sends a clear_halt to the given USB pipe. |
727 | */ |
728 | static void wq_clear_halt(struct work_struct *wq_obj) |
729 | { |
730 | struct clear_hold_work *clear_work = to_clear_hold_work(wq_obj); |
731 | struct most_dev *mdev = clear_work->mdev; |
732 | unsigned int channel = clear_work->channel; |
733 | int pipe = clear_work->pipe; |
734 | int snd_pipe; |
735 | int peer; |
736 | |
737 | mutex_lock(&mdev->io_mutex); |
738 | most_stop_enqueue(iface: &mdev->iface, channel_idx: channel); |
739 | usb_kill_anchored_urbs(anchor: &mdev->busy_urbs[channel]); |
740 | if (usb_clear_halt(dev: mdev->usb_device, pipe)) |
741 | dev_warn(&mdev->usb_device->dev, "Failed to reset endpoint.\n" ); |
742 | |
743 | /* If the functional Stall condition has been set on an |
744 | * asynchronous rx channel, we need to clear the tx channel |
745 | * too, since the hardware runs its clean-up sequence on both |
746 | * channels, as they are physically one on the network. |
747 | * |
748 | * The USB interface that exposes the asynchronous channels |
749 | * contains always two endpoints, and two only. |
750 | */ |
751 | if (mdev->conf[channel].data_type == MOST_CH_ASYNC && |
752 | mdev->conf[channel].direction == MOST_CH_RX) { |
753 | if (channel == 0) |
754 | peer = 1; |
755 | else |
756 | peer = 0; |
757 | snd_pipe = usb_sndbulkpipe(mdev->usb_device, |
758 | mdev->ep_address[peer]); |
759 | usb_clear_halt(dev: mdev->usb_device, pipe: snd_pipe); |
760 | } |
761 | mdev->is_channel_healthy[channel] = true; |
762 | most_resume_enqueue(iface: &mdev->iface, channel_idx: channel); |
763 | mutex_unlock(lock: &mdev->io_mutex); |
764 | } |
765 | |
766 | /* |
767 | * hdm_usb_fops - file operation table for USB driver |
768 | */ |
769 | static const struct file_operations hdm_usb_fops = { |
770 | .owner = THIS_MODULE, |
771 | }; |
772 | |
773 | /* |
774 | * usb_device_id - ID table for HCD device probing |
775 | */ |
776 | static const struct usb_device_id usbid[] = { |
777 | { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_BRDG), }, |
778 | { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81118), }, |
779 | { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81119), }, |
780 | { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81210), }, |
781 | { } /* Terminating entry */ |
782 | }; |
783 | |
784 | struct regs { |
785 | const char *name; |
786 | u16 reg; |
787 | }; |
788 | |
789 | static const struct regs ro_regs[] = { |
790 | { "ni_state" , DRCI_REG_NI_STATE }, |
791 | { "packet_bandwidth" , DRCI_REG_PACKET_BW }, |
792 | { "node_address" , DRCI_REG_NODE_ADDR }, |
793 | { "node_position" , DRCI_REG_NODE_POS }, |
794 | }; |
795 | |
796 | static const struct regs rw_regs[] = { |
797 | { "mep_filter" , DRCI_REG_MEP_FILTER }, |
798 | { "mep_hash0" , DRCI_REG_HASH_TBL0 }, |
799 | { "mep_hash1" , DRCI_REG_HASH_TBL1 }, |
800 | { "mep_hash2" , DRCI_REG_HASH_TBL2 }, |
801 | { "mep_hash3" , DRCI_REG_HASH_TBL3 }, |
802 | { "mep_eui48_hi" , DRCI_REG_HW_ADDR_HI }, |
803 | { "mep_eui48_mi" , DRCI_REG_HW_ADDR_MI }, |
804 | { "mep_eui48_lo" , DRCI_REG_HW_ADDR_LO }, |
805 | }; |
806 | |
807 | static int get_stat_reg_addr(const struct regs *regs, int size, |
808 | const char *name, u16 *reg_addr) |
809 | { |
810 | int i; |
811 | |
812 | for (i = 0; i < size; i++) { |
813 | if (sysfs_streq(s1: name, s2: regs[i].name)) { |
814 | *reg_addr = regs[i].reg; |
815 | return 0; |
816 | } |
817 | } |
818 | return -EINVAL; |
819 | } |
820 | |
821 | #define get_static_reg_addr(regs, name, reg_addr) \ |
822 | get_stat_reg_addr(regs, ARRAY_SIZE(regs), name, reg_addr) |
823 | |
824 | static ssize_t value_show(struct device *dev, struct device_attribute *attr, |
825 | char *buf) |
826 | { |
827 | const char *name = attr->attr.name; |
828 | struct most_dci_obj *dci_obj = to_dci_obj(dev); |
829 | u16 val; |
830 | u16 reg_addr; |
831 | int err; |
832 | |
833 | if (sysfs_streq(s1: name, s2: "arb_address" )) |
834 | return sysfs_emit(buf, fmt: "%04x\n" , dci_obj->reg_addr); |
835 | |
836 | if (sysfs_streq(s1: name, s2: "arb_value" )) |
837 | reg_addr = dci_obj->reg_addr; |
838 | else if (get_static_reg_addr(ro_regs, name, ®_addr) && |
839 | get_static_reg_addr(rw_regs, name, ®_addr)) |
840 | return -EINVAL; |
841 | |
842 | err = drci_rd_reg(dev: dci_obj->usb_device, reg: reg_addr, buf: &val); |
843 | if (err < 0) |
844 | return err; |
845 | |
846 | return sysfs_emit(buf, fmt: "%04x\n" , val); |
847 | } |
848 | |
849 | static ssize_t value_store(struct device *dev, struct device_attribute *attr, |
850 | const char *buf, size_t count) |
851 | { |
852 | u16 val; |
853 | u16 reg_addr; |
854 | const char *name = attr->attr.name; |
855 | struct most_dci_obj *dci_obj = to_dci_obj(dev); |
856 | struct usb_device *usb_dev = dci_obj->usb_device; |
857 | int err; |
858 | |
859 | err = kstrtou16(s: buf, base: 16, res: &val); |
860 | if (err) |
861 | return err; |
862 | |
863 | if (sysfs_streq(s1: name, s2: "arb_address" )) { |
864 | dci_obj->reg_addr = val; |
865 | return count; |
866 | } |
867 | |
868 | if (sysfs_streq(s1: name, s2: "arb_value" )) |
869 | err = drci_wr_reg(dev: usb_dev, reg: dci_obj->reg_addr, data: val); |
870 | else if (sysfs_streq(s1: name, s2: "sync_ep" )) |
871 | err = start_sync_ep(usb_dev, ep: val); |
872 | else if (!get_static_reg_addr(rw_regs, name, ®_addr)) |
873 | err = drci_wr_reg(dev: usb_dev, reg: reg_addr, data: val); |
874 | else |
875 | return -EINVAL; |
876 | |
877 | if (err < 0) |
878 | return err; |
879 | |
880 | return count; |
881 | } |
882 | |
883 | static DEVICE_ATTR(ni_state, 0444, value_show, NULL); |
884 | static DEVICE_ATTR(packet_bandwidth, 0444, value_show, NULL); |
885 | static DEVICE_ATTR(node_address, 0444, value_show, NULL); |
886 | static DEVICE_ATTR(node_position, 0444, value_show, NULL); |
887 | static DEVICE_ATTR(sync_ep, 0200, NULL, value_store); |
888 | static DEVICE_ATTR(mep_filter, 0644, value_show, value_store); |
889 | static DEVICE_ATTR(mep_hash0, 0644, value_show, value_store); |
890 | static DEVICE_ATTR(mep_hash1, 0644, value_show, value_store); |
891 | static DEVICE_ATTR(mep_hash2, 0644, value_show, value_store); |
892 | static DEVICE_ATTR(mep_hash3, 0644, value_show, value_store); |
893 | static DEVICE_ATTR(mep_eui48_hi, 0644, value_show, value_store); |
894 | static DEVICE_ATTR(mep_eui48_mi, 0644, value_show, value_store); |
895 | static DEVICE_ATTR(mep_eui48_lo, 0644, value_show, value_store); |
896 | static DEVICE_ATTR(arb_address, 0644, value_show, value_store); |
897 | static DEVICE_ATTR(arb_value, 0644, value_show, value_store); |
898 | |
899 | static struct attribute *dci_attrs[] = { |
900 | &dev_attr_ni_state.attr, |
901 | &dev_attr_packet_bandwidth.attr, |
902 | &dev_attr_node_address.attr, |
903 | &dev_attr_node_position.attr, |
904 | &dev_attr_sync_ep.attr, |
905 | &dev_attr_mep_filter.attr, |
906 | &dev_attr_mep_hash0.attr, |
907 | &dev_attr_mep_hash1.attr, |
908 | &dev_attr_mep_hash2.attr, |
909 | &dev_attr_mep_hash3.attr, |
910 | &dev_attr_mep_eui48_hi.attr, |
911 | &dev_attr_mep_eui48_mi.attr, |
912 | &dev_attr_mep_eui48_lo.attr, |
913 | &dev_attr_arb_address.attr, |
914 | &dev_attr_arb_value.attr, |
915 | NULL, |
916 | }; |
917 | |
918 | ATTRIBUTE_GROUPS(dci); |
919 | |
920 | static void release_dci(struct device *dev) |
921 | { |
922 | struct most_dci_obj *dci = to_dci_obj(dev); |
923 | |
924 | put_device(dev: dev->parent); |
925 | kfree(objp: dci); |
926 | } |
927 | |
928 | static void release_mdev(struct device *dev) |
929 | { |
930 | struct most_dev *mdev = to_mdev_from_dev(dev); |
931 | |
932 | kfree(objp: mdev); |
933 | } |
934 | /** |
935 | * hdm_probe - probe function of USB device driver |
936 | * @interface: Interface of the attached USB device |
937 | * @id: Pointer to the USB ID table. |
938 | * |
939 | * This allocates and initializes the device instance, adds the new |
940 | * entry to the internal list, scans the USB descriptors and registers |
941 | * the interface with the core. |
942 | * Additionally, the DCI objects are created and the hardware is sync'd. |
943 | * |
944 | * Return 0 on success. In case of an error a negative number is returned. |
945 | */ |
946 | static int |
947 | hdm_probe(struct usb_interface *interface, const struct usb_device_id *id) |
948 | { |
949 | struct usb_host_interface *usb_iface_desc = interface->cur_altsetting; |
950 | struct usb_device *usb_dev = interface_to_usbdev(interface); |
951 | struct device *dev = &usb_dev->dev; |
952 | struct most_dev *mdev; |
953 | unsigned int i; |
954 | unsigned int num_endpoints; |
955 | struct most_channel_capability *tmp_cap; |
956 | struct usb_endpoint_descriptor *ep_desc; |
957 | int ret = -ENOMEM; |
958 | |
959 | mdev = kzalloc(size: sizeof(*mdev), GFP_KERNEL); |
960 | if (!mdev) |
961 | return -ENOMEM; |
962 | |
963 | usb_set_intfdata(intf: interface, data: mdev); |
964 | num_endpoints = usb_iface_desc->desc.bNumEndpoints; |
965 | if (num_endpoints > MAX_NUM_ENDPOINTS) { |
966 | kfree(objp: mdev); |
967 | return -EINVAL; |
968 | } |
969 | mutex_init(&mdev->io_mutex); |
970 | INIT_WORK(&mdev->poll_work_obj, wq_netinfo); |
971 | timer_setup(&mdev->link_stat_timer, link_stat_timer_handler, 0); |
972 | |
973 | mdev->usb_device = usb_dev; |
974 | mdev->link_stat_timer.expires = jiffies + (2 * HZ); |
975 | |
976 | mdev->iface.mod = hdm_usb_fops.owner; |
977 | mdev->iface.dev = &mdev->dev; |
978 | mdev->iface.driver_dev = &interface->dev; |
979 | mdev->iface.interface = ITYPE_USB; |
980 | mdev->iface.configure = hdm_configure_channel; |
981 | mdev->iface.request_netinfo = hdm_request_netinfo; |
982 | mdev->iface.enqueue = hdm_enqueue; |
983 | mdev->iface.poison_channel = hdm_poison_channel; |
984 | mdev->iface.dma_alloc = hdm_dma_alloc; |
985 | mdev->iface.dma_free = hdm_dma_free; |
986 | mdev->iface.description = mdev->description; |
987 | mdev->iface.num_channels = num_endpoints; |
988 | |
989 | snprintf(buf: mdev->description, size: sizeof(mdev->description), |
990 | fmt: "%d-%s:%d.%d" , |
991 | usb_dev->bus->busnum, |
992 | usb_dev->devpath, |
993 | usb_dev->config->desc.bConfigurationValue, |
994 | usb_iface_desc->desc.bInterfaceNumber); |
995 | |
996 | mdev->dev.init_name = mdev->description; |
997 | mdev->dev.parent = &interface->dev; |
998 | mdev->dev.release = release_mdev; |
999 | mdev->conf = kcalloc(n: num_endpoints, size: sizeof(*mdev->conf), GFP_KERNEL); |
1000 | if (!mdev->conf) |
1001 | goto err_free_mdev; |
1002 | |
1003 | mdev->cap = kcalloc(n: num_endpoints, size: sizeof(*mdev->cap), GFP_KERNEL); |
1004 | if (!mdev->cap) |
1005 | goto err_free_conf; |
1006 | |
1007 | mdev->iface.channel_vector = mdev->cap; |
1008 | mdev->ep_address = |
1009 | kcalloc(n: num_endpoints, size: sizeof(*mdev->ep_address), GFP_KERNEL); |
1010 | if (!mdev->ep_address) |
1011 | goto err_free_cap; |
1012 | |
1013 | mdev->busy_urbs = |
1014 | kcalloc(n: num_endpoints, size: sizeof(*mdev->busy_urbs), GFP_KERNEL); |
1015 | if (!mdev->busy_urbs) |
1016 | goto err_free_ep_address; |
1017 | |
1018 | tmp_cap = mdev->cap; |
1019 | for (i = 0; i < num_endpoints; i++) { |
1020 | ep_desc = &usb_iface_desc->endpoint[i].desc; |
1021 | mdev->ep_address[i] = ep_desc->bEndpointAddress; |
1022 | mdev->padding_active[i] = false; |
1023 | mdev->is_channel_healthy[i] = true; |
1024 | |
1025 | snprintf(buf: &mdev->suffix[i][0], MAX_SUFFIX_LEN, fmt: "ep%02x" , |
1026 | mdev->ep_address[i]); |
1027 | |
1028 | tmp_cap->name_suffix = &mdev->suffix[i][0]; |
1029 | tmp_cap->buffer_size_packet = MAX_BUF_SIZE; |
1030 | tmp_cap->buffer_size_streaming = MAX_BUF_SIZE; |
1031 | tmp_cap->num_buffers_packet = BUF_CHAIN_SIZE; |
1032 | tmp_cap->num_buffers_streaming = BUF_CHAIN_SIZE; |
1033 | tmp_cap->data_type = MOST_CH_CONTROL | MOST_CH_ASYNC | |
1034 | MOST_CH_ISOC | MOST_CH_SYNC; |
1035 | if (usb_endpoint_dir_in(epd: ep_desc)) |
1036 | tmp_cap->direction = MOST_CH_RX; |
1037 | else |
1038 | tmp_cap->direction = MOST_CH_TX; |
1039 | tmp_cap++; |
1040 | init_usb_anchor(anchor: &mdev->busy_urbs[i]); |
1041 | spin_lock_init(&mdev->channel_lock[i]); |
1042 | } |
1043 | dev_dbg(dev, "claimed gadget: Vendor=%4.4x ProdID=%4.4x Bus=%02x Device=%02x\n" , |
1044 | le16_to_cpu(usb_dev->descriptor.idVendor), |
1045 | le16_to_cpu(usb_dev->descriptor.idProduct), |
1046 | usb_dev->bus->busnum, |
1047 | usb_dev->devnum); |
1048 | |
1049 | dev_dbg(dev, "device path: /sys/bus/usb/devices/%d-%s:%d.%d\n" , |
1050 | usb_dev->bus->busnum, |
1051 | usb_dev->devpath, |
1052 | usb_dev->config->desc.bConfigurationValue, |
1053 | usb_iface_desc->desc.bInterfaceNumber); |
1054 | |
1055 | ret = most_register_interface(iface: &mdev->iface); |
1056 | if (ret) |
1057 | goto err_free_busy_urbs; |
1058 | |
1059 | mutex_lock(&mdev->io_mutex); |
1060 | if (le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81118 || |
1061 | le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81119 || |
1062 | le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81210) { |
1063 | mdev->dci = kzalloc(size: sizeof(*mdev->dci), GFP_KERNEL); |
1064 | if (!mdev->dci) { |
1065 | mutex_unlock(lock: &mdev->io_mutex); |
1066 | most_deregister_interface(iface: &mdev->iface); |
1067 | ret = -ENOMEM; |
1068 | goto err_free_busy_urbs; |
1069 | } |
1070 | |
1071 | mdev->dci->dev.init_name = "dci" ; |
1072 | mdev->dci->dev.parent = get_device(dev: mdev->iface.dev); |
1073 | mdev->dci->dev.groups = dci_groups; |
1074 | mdev->dci->dev.release = release_dci; |
1075 | if (device_register(dev: &mdev->dci->dev)) { |
1076 | mutex_unlock(lock: &mdev->io_mutex); |
1077 | most_deregister_interface(iface: &mdev->iface); |
1078 | ret = -ENOMEM; |
1079 | goto err_free_dci; |
1080 | } |
1081 | mdev->dci->usb_device = mdev->usb_device; |
1082 | } |
1083 | mutex_unlock(lock: &mdev->io_mutex); |
1084 | return 0; |
1085 | err_free_dci: |
1086 | put_device(dev: &mdev->dci->dev); |
1087 | err_free_busy_urbs: |
1088 | kfree(objp: mdev->busy_urbs); |
1089 | err_free_ep_address: |
1090 | kfree(objp: mdev->ep_address); |
1091 | err_free_cap: |
1092 | kfree(objp: mdev->cap); |
1093 | err_free_conf: |
1094 | kfree(objp: mdev->conf); |
1095 | err_free_mdev: |
1096 | put_device(dev: &mdev->dev); |
1097 | return ret; |
1098 | } |
1099 | |
1100 | /** |
1101 | * hdm_disconnect - disconnect function of USB device driver |
1102 | * @interface: Interface of the attached USB device |
1103 | * |
1104 | * This deregisters the interface with the core, removes the kernel timer |
1105 | * and frees resources. |
1106 | * |
1107 | * Context: hub kernel thread |
1108 | */ |
1109 | static void hdm_disconnect(struct usb_interface *interface) |
1110 | { |
1111 | struct most_dev *mdev = usb_get_intfdata(intf: interface); |
1112 | |
1113 | mutex_lock(&mdev->io_mutex); |
1114 | usb_set_intfdata(intf: interface, NULL); |
1115 | mdev->usb_device = NULL; |
1116 | mutex_unlock(lock: &mdev->io_mutex); |
1117 | |
1118 | del_timer_sync(timer: &mdev->link_stat_timer); |
1119 | cancel_work_sync(work: &mdev->poll_work_obj); |
1120 | |
1121 | if (mdev->dci) |
1122 | device_unregister(dev: &mdev->dci->dev); |
1123 | most_deregister_interface(iface: &mdev->iface); |
1124 | |
1125 | kfree(objp: mdev->busy_urbs); |
1126 | kfree(objp: mdev->cap); |
1127 | kfree(objp: mdev->conf); |
1128 | kfree(objp: mdev->ep_address); |
1129 | put_device(dev: &mdev->dci->dev); |
1130 | put_device(dev: &mdev->dev); |
1131 | } |
1132 | |
1133 | static int hdm_suspend(struct usb_interface *interface, pm_message_t message) |
1134 | { |
1135 | struct most_dev *mdev = usb_get_intfdata(intf: interface); |
1136 | int i; |
1137 | |
1138 | mutex_lock(&mdev->io_mutex); |
1139 | for (i = 0; i < mdev->iface.num_channels; i++) { |
1140 | most_stop_enqueue(iface: &mdev->iface, channel_idx: i); |
1141 | usb_kill_anchored_urbs(anchor: &mdev->busy_urbs[i]); |
1142 | } |
1143 | mutex_unlock(lock: &mdev->io_mutex); |
1144 | return 0; |
1145 | } |
1146 | |
1147 | static int hdm_resume(struct usb_interface *interface) |
1148 | { |
1149 | struct most_dev *mdev = usb_get_intfdata(intf: interface); |
1150 | int i; |
1151 | |
1152 | mutex_lock(&mdev->io_mutex); |
1153 | for (i = 0; i < mdev->iface.num_channels; i++) |
1154 | most_resume_enqueue(iface: &mdev->iface, channel_idx: i); |
1155 | mutex_unlock(lock: &mdev->io_mutex); |
1156 | return 0; |
1157 | } |
1158 | |
1159 | static struct usb_driver hdm_usb = { |
1160 | .name = "hdm_usb" , |
1161 | .id_table = usbid, |
1162 | .probe = hdm_probe, |
1163 | .disconnect = hdm_disconnect, |
1164 | .resume = hdm_resume, |
1165 | .suspend = hdm_suspend, |
1166 | }; |
1167 | |
1168 | module_usb_driver(hdm_usb); |
1169 | MODULE_LICENSE("GPL" ); |
1170 | MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>" ); |
1171 | MODULE_DESCRIPTION("HDM_4_USB" ); |
1172 | |