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a10e763b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
338a1281 OP |
2 | /* |
3 | * Driver for the Diolan DLN-2 USB adapter | |
4 | * | |
5 | * Copyright (c) 2014 Intel Corporation | |
6 | * | |
7 | * Derived from: | |
8 | * i2c-diolan-u2c.c | |
9 | * Copyright (c) 2010-2011 Ericsson AB | |
338a1281 OP |
10 | */ |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/types.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/usb.h> | |
17 | #include <linux/i2c.h> | |
18 | #include <linux/mutex.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/mfd/core.h> | |
21 | #include <linux/mfd/dln2.h> | |
22 | #include <linux/rculist.h> | |
23 | ||
24 | struct dln2_header { | |
25 | __le16 size; | |
26 | __le16 id; | |
27 | __le16 echo; | |
28 | __le16 handle; | |
29 | }; | |
30 | ||
31 | struct dln2_response { | |
32 | struct dln2_header hdr; | |
33 | __le16 result; | |
34 | }; | |
35 | ||
36 | #define DLN2_GENERIC_MODULE_ID 0x00 | |
37 | #define DLN2_GENERIC_CMD(cmd) DLN2_CMD(cmd, DLN2_GENERIC_MODULE_ID) | |
38 | #define CMD_GET_DEVICE_VER DLN2_GENERIC_CMD(0x30) | |
39 | #define CMD_GET_DEVICE_SN DLN2_GENERIC_CMD(0x31) | |
40 | ||
41 | #define DLN2_HW_ID 0x200 | |
42 | #define DLN2_USB_TIMEOUT 200 /* in ms */ | |
43 | #define DLN2_MAX_RX_SLOTS 16 | |
44 | #define DLN2_MAX_URBS 16 | |
45 | #define DLN2_RX_BUF_SIZE 512 | |
46 | ||
47 | enum dln2_handle { | |
48 | DLN2_HANDLE_EVENT = 0, /* don't change, hardware defined */ | |
49 | DLN2_HANDLE_CTRL, | |
50 | DLN2_HANDLE_GPIO, | |
51 | DLN2_HANDLE_I2C, | |
21cf3318 | 52 | DLN2_HANDLE_SPI, |
338a1281 OP |
53 | DLN2_HANDLES |
54 | }; | |
55 | ||
56 | /* | |
57 | * Receive context used between the receive demultiplexer and the transfer | |
58 | * routine. While sending a request the transfer routine will look for a free | |
59 | * receive context and use it to wait for a response and to receive the URB and | |
60 | * thus the response data. | |
61 | */ | |
62 | struct dln2_rx_context { | |
63 | /* completion used to wait for a response */ | |
64 | struct completion done; | |
65 | ||
66 | /* if non-NULL the URB contains the response */ | |
67 | struct urb *urb; | |
68 | ||
69 | /* if true then this context is used to wait for a response */ | |
70 | bool in_use; | |
71 | }; | |
72 | ||
73 | /* | |
74 | * Receive contexts for a particular DLN2 module (i2c, gpio, etc.). We use the | |
75 | * handle header field to identify the module in dln2_dev.mod_rx_slots and then | |
76 | * the echo header field to index the slots field and find the receive context | |
77 | * for a particular request. | |
78 | */ | |
79 | struct dln2_mod_rx_slots { | |
80 | /* RX slots bitmap */ | |
81 | DECLARE_BITMAP(bmap, DLN2_MAX_RX_SLOTS); | |
82 | ||
83 | /* used to wait for a free RX slot */ | |
84 | wait_queue_head_t wq; | |
85 | ||
86 | /* used to wait for an RX operation to complete */ | |
87 | struct dln2_rx_context slots[DLN2_MAX_RX_SLOTS]; | |
88 | ||
89 | /* avoid races between alloc/free_rx_slot and dln2_rx_transfer */ | |
90 | spinlock_t lock; | |
91 | }; | |
92 | ||
93 | struct dln2_dev { | |
94 | struct usb_device *usb_dev; | |
95 | struct usb_interface *interface; | |
96 | u8 ep_in; | |
97 | u8 ep_out; | |
98 | ||
99 | struct urb *rx_urb[DLN2_MAX_URBS]; | |
100 | void *rx_buf[DLN2_MAX_URBS]; | |
101 | ||
102 | struct dln2_mod_rx_slots mod_rx_slots[DLN2_HANDLES]; | |
103 | ||
104 | struct list_head event_cb_list; | |
105 | spinlock_t event_cb_lock; | |
106 | ||
107 | bool disconnect; | |
108 | int active_transfers; | |
109 | wait_queue_head_t disconnect_wq; | |
110 | spinlock_t disconnect_lock; | |
111 | }; | |
112 | ||
113 | struct dln2_event_cb_entry { | |
114 | struct list_head list; | |
115 | u16 id; | |
116 | struct platform_device *pdev; | |
117 | dln2_event_cb_t callback; | |
118 | }; | |
119 | ||
120 | int dln2_register_event_cb(struct platform_device *pdev, u16 id, | |
121 | dln2_event_cb_t event_cb) | |
122 | { | |
123 | struct dln2_dev *dln2 = dev_get_drvdata(pdev->dev.parent); | |
124 | struct dln2_event_cb_entry *i, *entry; | |
125 | unsigned long flags; | |
126 | int ret = 0; | |
127 | ||
128 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
129 | if (!entry) | |
130 | return -ENOMEM; | |
131 | ||
132 | entry->id = id; | |
133 | entry->callback = event_cb; | |
134 | entry->pdev = pdev; | |
135 | ||
136 | spin_lock_irqsave(&dln2->event_cb_lock, flags); | |
137 | ||
138 | list_for_each_entry(i, &dln2->event_cb_list, list) { | |
139 | if (i->id == id) { | |
140 | ret = -EBUSY; | |
141 | break; | |
142 | } | |
143 | } | |
144 | ||
145 | if (!ret) | |
146 | list_add_rcu(&entry->list, &dln2->event_cb_list); | |
147 | ||
148 | spin_unlock_irqrestore(&dln2->event_cb_lock, flags); | |
149 | ||
150 | if (ret) | |
151 | kfree(entry); | |
152 | ||
153 | return ret; | |
154 | } | |
155 | EXPORT_SYMBOL(dln2_register_event_cb); | |
156 | ||
157 | void dln2_unregister_event_cb(struct platform_device *pdev, u16 id) | |
158 | { | |
159 | struct dln2_dev *dln2 = dev_get_drvdata(pdev->dev.parent); | |
160 | struct dln2_event_cb_entry *i; | |
161 | unsigned long flags; | |
162 | bool found = false; | |
163 | ||
164 | spin_lock_irqsave(&dln2->event_cb_lock, flags); | |
165 | ||
166 | list_for_each_entry(i, &dln2->event_cb_list, list) { | |
167 | if (i->id == id) { | |
168 | list_del_rcu(&i->list); | |
169 | found = true; | |
170 | break; | |
171 | } | |
172 | } | |
173 | ||
174 | spin_unlock_irqrestore(&dln2->event_cb_lock, flags); | |
175 | ||
176 | if (found) { | |
177 | synchronize_rcu(); | |
178 | kfree(i); | |
179 | } | |
180 | } | |
181 | EXPORT_SYMBOL(dln2_unregister_event_cb); | |
182 | ||
183 | /* | |
184 | * Returns true if a valid transfer slot is found. In this case the URB must not | |
185 | * be resubmitted immediately in dln2_rx as we need the data when dln2_transfer | |
186 | * is woke up. It will be resubmitted there. | |
187 | */ | |
188 | static bool dln2_transfer_complete(struct dln2_dev *dln2, struct urb *urb, | |
189 | u16 handle, u16 rx_slot) | |
190 | { | |
191 | struct device *dev = &dln2->interface->dev; | |
192 | struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[handle]; | |
193 | struct dln2_rx_context *rxc; | |
50d44f82 | 194 | unsigned long flags; |
338a1281 OP |
195 | bool valid_slot = false; |
196 | ||
00ee7a37 OP |
197 | if (rx_slot >= DLN2_MAX_RX_SLOTS) |
198 | goto out; | |
199 | ||
338a1281 OP |
200 | rxc = &rxs->slots[rx_slot]; |
201 | ||
50d44f82 | 202 | spin_lock_irqsave(&rxs->lock, flags); |
338a1281 OP |
203 | if (rxc->in_use && !rxc->urb) { |
204 | rxc->urb = urb; | |
205 | complete(&rxc->done); | |
206 | valid_slot = true; | |
207 | } | |
50d44f82 | 208 | spin_unlock_irqrestore(&rxs->lock, flags); |
338a1281 | 209 | |
00ee7a37 | 210 | out: |
338a1281 OP |
211 | if (!valid_slot) |
212 | dev_warn(dev, "bad/late response %d/%d\n", handle, rx_slot); | |
213 | ||
214 | return valid_slot; | |
215 | } | |
216 | ||
217 | static void dln2_run_event_callbacks(struct dln2_dev *dln2, u16 id, u16 echo, | |
218 | void *data, int len) | |
219 | { | |
220 | struct dln2_event_cb_entry *i; | |
221 | ||
222 | rcu_read_lock(); | |
223 | ||
224 | list_for_each_entry_rcu(i, &dln2->event_cb_list, list) { | |
225 | if (i->id == id) { | |
226 | i->callback(i->pdev, echo, data, len); | |
227 | break; | |
228 | } | |
229 | } | |
230 | ||
231 | rcu_read_unlock(); | |
232 | } | |
233 | ||
234 | static void dln2_rx(struct urb *urb) | |
235 | { | |
236 | struct dln2_dev *dln2 = urb->context; | |
237 | struct dln2_header *hdr = urb->transfer_buffer; | |
238 | struct device *dev = &dln2->interface->dev; | |
239 | u16 id, echo, handle, size; | |
240 | u8 *data; | |
241 | int len; | |
242 | int err; | |
243 | ||
244 | switch (urb->status) { | |
245 | case 0: | |
246 | /* success */ | |
247 | break; | |
248 | case -ECONNRESET: | |
249 | case -ENOENT: | |
250 | case -ESHUTDOWN: | |
251 | case -EPIPE: | |
252 | /* this urb is terminated, clean up */ | |
253 | dev_dbg(dev, "urb shutting down with status %d\n", urb->status); | |
254 | return; | |
255 | default: | |
256 | dev_dbg(dev, "nonzero urb status received %d\n", urb->status); | |
257 | goto out; | |
258 | } | |
259 | ||
260 | if (urb->actual_length < sizeof(struct dln2_header)) { | |
261 | dev_err(dev, "short response: %d\n", urb->actual_length); | |
262 | goto out; | |
263 | } | |
264 | ||
265 | handle = le16_to_cpu(hdr->handle); | |
266 | id = le16_to_cpu(hdr->id); | |
267 | echo = le16_to_cpu(hdr->echo); | |
268 | size = le16_to_cpu(hdr->size); | |
269 | ||
270 | if (size != urb->actual_length) { | |
271 | dev_err(dev, "size mismatch: handle %x cmd %x echo %x size %d actual %d\n", | |
272 | handle, id, echo, size, urb->actual_length); | |
273 | goto out; | |
274 | } | |
275 | ||
276 | if (handle >= DLN2_HANDLES) { | |
277 | dev_warn(dev, "invalid handle %d\n", handle); | |
278 | goto out; | |
279 | } | |
280 | ||
281 | data = urb->transfer_buffer + sizeof(struct dln2_header); | |
282 | len = urb->actual_length - sizeof(struct dln2_header); | |
283 | ||
284 | if (handle == DLN2_HANDLE_EVENT) { | |
285 | dln2_run_event_callbacks(dln2, id, echo, data, len); | |
286 | } else { | |
287 | /* URB will be re-submitted in _dln2_transfer (free_rx_slot) */ | |
288 | if (dln2_transfer_complete(dln2, urb, handle, echo)) | |
289 | return; | |
290 | } | |
291 | ||
292 | out: | |
293 | err = usb_submit_urb(urb, GFP_ATOMIC); | |
294 | if (err < 0) | |
295 | dev_err(dev, "failed to resubmit RX URB: %d\n", err); | |
296 | } | |
297 | ||
298 | static void *dln2_prep_buf(u16 handle, u16 cmd, u16 echo, const void *obuf, | |
299 | int *obuf_len, gfp_t gfp) | |
300 | { | |
301 | int len; | |
302 | void *buf; | |
303 | struct dln2_header *hdr; | |
304 | ||
305 | len = *obuf_len + sizeof(*hdr); | |
306 | buf = kmalloc(len, gfp); | |
307 | if (!buf) | |
308 | return NULL; | |
309 | ||
310 | hdr = (struct dln2_header *)buf; | |
311 | hdr->id = cpu_to_le16(cmd); | |
312 | hdr->size = cpu_to_le16(len); | |
313 | hdr->echo = cpu_to_le16(echo); | |
314 | hdr->handle = cpu_to_le16(handle); | |
315 | ||
316 | memcpy(buf + sizeof(*hdr), obuf, *obuf_len); | |
317 | ||
318 | *obuf_len = len; | |
319 | ||
320 | return buf; | |
321 | } | |
322 | ||
323 | static int dln2_send_wait(struct dln2_dev *dln2, u16 handle, u16 cmd, u16 echo, | |
324 | const void *obuf, int obuf_len) | |
325 | { | |
326 | int ret = 0; | |
327 | int len = obuf_len; | |
328 | void *buf; | |
329 | int actual; | |
330 | ||
331 | buf = dln2_prep_buf(handle, cmd, echo, obuf, &len, GFP_KERNEL); | |
332 | if (!buf) | |
333 | return -ENOMEM; | |
334 | ||
335 | ret = usb_bulk_msg(dln2->usb_dev, | |
336 | usb_sndbulkpipe(dln2->usb_dev, dln2->ep_out), | |
337 | buf, len, &actual, DLN2_USB_TIMEOUT); | |
338 | ||
339 | kfree(buf); | |
340 | ||
341 | return ret; | |
342 | } | |
343 | ||
344 | static bool find_free_slot(struct dln2_dev *dln2, u16 handle, int *slot) | |
345 | { | |
346 | struct dln2_mod_rx_slots *rxs; | |
347 | unsigned long flags; | |
348 | ||
349 | if (dln2->disconnect) { | |
350 | *slot = -ENODEV; | |
351 | return true; | |
352 | } | |
353 | ||
354 | rxs = &dln2->mod_rx_slots[handle]; | |
355 | ||
356 | spin_lock_irqsave(&rxs->lock, flags); | |
357 | ||
358 | *slot = find_first_zero_bit(rxs->bmap, DLN2_MAX_RX_SLOTS); | |
359 | ||
360 | if (*slot < DLN2_MAX_RX_SLOTS) { | |
361 | struct dln2_rx_context *rxc = &rxs->slots[*slot]; | |
362 | ||
363 | set_bit(*slot, rxs->bmap); | |
364 | rxc->in_use = true; | |
365 | } | |
366 | ||
367 | spin_unlock_irqrestore(&rxs->lock, flags); | |
368 | ||
369 | return *slot < DLN2_MAX_RX_SLOTS; | |
370 | } | |
371 | ||
372 | static int alloc_rx_slot(struct dln2_dev *dln2, u16 handle) | |
373 | { | |
374 | int ret; | |
375 | int slot; | |
376 | ||
377 | /* | |
378 | * No need to timeout here, the wait is bounded by the timeout in | |
379 | * _dln2_transfer. | |
380 | */ | |
381 | ret = wait_event_interruptible(dln2->mod_rx_slots[handle].wq, | |
382 | find_free_slot(dln2, handle, &slot)); | |
383 | if (ret < 0) | |
384 | return ret; | |
385 | ||
386 | return slot; | |
387 | } | |
388 | ||
389 | static void free_rx_slot(struct dln2_dev *dln2, u16 handle, int slot) | |
390 | { | |
391 | struct dln2_mod_rx_slots *rxs; | |
392 | struct urb *urb = NULL; | |
393 | unsigned long flags; | |
394 | struct dln2_rx_context *rxc; | |
395 | ||
396 | rxs = &dln2->mod_rx_slots[handle]; | |
397 | ||
398 | spin_lock_irqsave(&rxs->lock, flags); | |
399 | ||
400 | clear_bit(slot, rxs->bmap); | |
401 | ||
402 | rxc = &rxs->slots[slot]; | |
403 | rxc->in_use = false; | |
404 | urb = rxc->urb; | |
405 | rxc->urb = NULL; | |
406 | reinit_completion(&rxc->done); | |
407 | ||
408 | spin_unlock_irqrestore(&rxs->lock, flags); | |
409 | ||
410 | if (urb) { | |
411 | int err; | |
412 | struct device *dev = &dln2->interface->dev; | |
413 | ||
414 | err = usb_submit_urb(urb, GFP_KERNEL); | |
415 | if (err < 0) | |
416 | dev_err(dev, "failed to resubmit RX URB: %d\n", err); | |
417 | } | |
418 | ||
419 | wake_up_interruptible(&rxs->wq); | |
420 | } | |
421 | ||
422 | static int _dln2_transfer(struct dln2_dev *dln2, u16 handle, u16 cmd, | |
423 | const void *obuf, unsigned obuf_len, | |
424 | void *ibuf, unsigned *ibuf_len) | |
425 | { | |
426 | int ret = 0; | |
427 | int rx_slot; | |
428 | struct dln2_response *rsp; | |
429 | struct dln2_rx_context *rxc; | |
430 | struct device *dev = &dln2->interface->dev; | |
48579a9a | 431 | const unsigned long timeout = msecs_to_jiffies(DLN2_USB_TIMEOUT); |
338a1281 | 432 | struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[handle]; |
2fc2b484 | 433 | int size; |
338a1281 OP |
434 | |
435 | spin_lock(&dln2->disconnect_lock); | |
436 | if (!dln2->disconnect) | |
437 | dln2->active_transfers++; | |
438 | else | |
439 | ret = -ENODEV; | |
440 | spin_unlock(&dln2->disconnect_lock); | |
441 | ||
442 | if (ret) | |
443 | return ret; | |
444 | ||
445 | rx_slot = alloc_rx_slot(dln2, handle); | |
446 | if (rx_slot < 0) { | |
447 | ret = rx_slot; | |
448 | goto out_decr; | |
449 | } | |
450 | ||
451 | ret = dln2_send_wait(dln2, handle, cmd, rx_slot, obuf, obuf_len); | |
452 | if (ret < 0) { | |
453 | dev_err(dev, "USB write failed: %d\n", ret); | |
454 | goto out_free_rx_slot; | |
455 | } | |
456 | ||
457 | rxc = &rxs->slots[rx_slot]; | |
458 | ||
459 | ret = wait_for_completion_interruptible_timeout(&rxc->done, timeout); | |
460 | if (ret <= 0) { | |
461 | if (!ret) | |
462 | ret = -ETIMEDOUT; | |
463 | goto out_free_rx_slot; | |
7ca2b1c6 OP |
464 | } else { |
465 | ret = 0; | |
338a1281 OP |
466 | } |
467 | ||
468 | if (dln2->disconnect) { | |
469 | ret = -ENODEV; | |
470 | goto out_free_rx_slot; | |
471 | } | |
472 | ||
473 | /* if we got here we know that the response header has been checked */ | |
474 | rsp = rxc->urb->transfer_buffer; | |
2fc2b484 | 475 | size = le16_to_cpu(rsp->hdr.size); |
338a1281 | 476 | |
2fc2b484 | 477 | if (size < sizeof(*rsp)) { |
338a1281 OP |
478 | ret = -EPROTO; |
479 | goto out_free_rx_slot; | |
480 | } | |
481 | ||
482 | if (le16_to_cpu(rsp->result) > 0x80) { | |
483 | dev_dbg(dev, "%d received response with error %d\n", | |
484 | handle, le16_to_cpu(rsp->result)); | |
485 | ret = -EREMOTEIO; | |
486 | goto out_free_rx_slot; | |
487 | } | |
488 | ||
7ca2b1c6 | 489 | if (!ibuf) |
338a1281 | 490 | goto out_free_rx_slot; |
338a1281 | 491 | |
2fc2b484 DC |
492 | if (*ibuf_len > size - sizeof(*rsp)) |
493 | *ibuf_len = size - sizeof(*rsp); | |
338a1281 OP |
494 | |
495 | memcpy(ibuf, rsp + 1, *ibuf_len); | |
496 | ||
497 | out_free_rx_slot: | |
498 | free_rx_slot(dln2, handle, rx_slot); | |
499 | out_decr: | |
500 | spin_lock(&dln2->disconnect_lock); | |
501 | dln2->active_transfers--; | |
502 | spin_unlock(&dln2->disconnect_lock); | |
503 | if (dln2->disconnect) | |
504 | wake_up(&dln2->disconnect_wq); | |
505 | ||
506 | return ret; | |
507 | } | |
508 | ||
509 | int dln2_transfer(struct platform_device *pdev, u16 cmd, | |
510 | const void *obuf, unsigned obuf_len, | |
511 | void *ibuf, unsigned *ibuf_len) | |
512 | { | |
513 | struct dln2_platform_data *dln2_pdata; | |
514 | struct dln2_dev *dln2; | |
515 | u16 handle; | |
516 | ||
517 | dln2 = dev_get_drvdata(pdev->dev.parent); | |
518 | dln2_pdata = dev_get_platdata(&pdev->dev); | |
519 | handle = dln2_pdata->handle; | |
520 | ||
521 | return _dln2_transfer(dln2, handle, cmd, obuf, obuf_len, ibuf, | |
522 | ibuf_len); | |
523 | } | |
524 | EXPORT_SYMBOL(dln2_transfer); | |
525 | ||
526 | static int dln2_check_hw(struct dln2_dev *dln2) | |
527 | { | |
528 | int ret; | |
529 | __le32 hw_type; | |
530 | int len = sizeof(hw_type); | |
531 | ||
532 | ret = _dln2_transfer(dln2, DLN2_HANDLE_CTRL, CMD_GET_DEVICE_VER, | |
533 | NULL, 0, &hw_type, &len); | |
534 | if (ret < 0) | |
535 | return ret; | |
536 | if (len < sizeof(hw_type)) | |
537 | return -EREMOTEIO; | |
538 | ||
539 | if (le32_to_cpu(hw_type) != DLN2_HW_ID) { | |
540 | dev_err(&dln2->interface->dev, "Device ID 0x%x not supported\n", | |
541 | le32_to_cpu(hw_type)); | |
542 | return -ENODEV; | |
543 | } | |
544 | ||
545 | return 0; | |
546 | } | |
547 | ||
548 | static int dln2_print_serialno(struct dln2_dev *dln2) | |
549 | { | |
550 | int ret; | |
551 | __le32 serial_no; | |
552 | int len = sizeof(serial_no); | |
553 | struct device *dev = &dln2->interface->dev; | |
554 | ||
555 | ret = _dln2_transfer(dln2, DLN2_HANDLE_CTRL, CMD_GET_DEVICE_SN, NULL, 0, | |
556 | &serial_no, &len); | |
557 | if (ret < 0) | |
558 | return ret; | |
559 | if (len < sizeof(serial_no)) | |
560 | return -EREMOTEIO; | |
561 | ||
562 | dev_info(dev, "Diolan DLN2 serial %u\n", le32_to_cpu(serial_no)); | |
563 | ||
564 | return 0; | |
565 | } | |
566 | ||
567 | static int dln2_hw_init(struct dln2_dev *dln2) | |
568 | { | |
569 | int ret; | |
570 | ||
571 | ret = dln2_check_hw(dln2); | |
572 | if (ret < 0) | |
573 | return ret; | |
574 | ||
575 | return dln2_print_serialno(dln2); | |
576 | } | |
577 | ||
578 | static void dln2_free_rx_urbs(struct dln2_dev *dln2) | |
579 | { | |
580 | int i; | |
581 | ||
582 | for (i = 0; i < DLN2_MAX_URBS; i++) { | |
338a1281 OP |
583 | usb_free_urb(dln2->rx_urb[i]); |
584 | kfree(dln2->rx_buf[i]); | |
585 | } | |
586 | } | |
587 | ||
ee231aee OP |
588 | static void dln2_stop_rx_urbs(struct dln2_dev *dln2) |
589 | { | |
590 | int i; | |
591 | ||
592 | for (i = 0; i < DLN2_MAX_URBS; i++) | |
593 | usb_kill_urb(dln2->rx_urb[i]); | |
594 | } | |
595 | ||
338a1281 OP |
596 | static void dln2_free(struct dln2_dev *dln2) |
597 | { | |
598 | dln2_free_rx_urbs(dln2); | |
599 | usb_put_dev(dln2->usb_dev); | |
600 | kfree(dln2); | |
601 | } | |
602 | ||
603 | static int dln2_setup_rx_urbs(struct dln2_dev *dln2, | |
604 | struct usb_host_interface *hostif) | |
605 | { | |
606 | int i; | |
338a1281 | 607 | const int rx_max_size = DLN2_RX_BUF_SIZE; |
338a1281 OP |
608 | |
609 | for (i = 0; i < DLN2_MAX_URBS; i++) { | |
610 | dln2->rx_buf[i] = kmalloc(rx_max_size, GFP_KERNEL); | |
611 | if (!dln2->rx_buf[i]) | |
612 | return -ENOMEM; | |
613 | ||
614 | dln2->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL); | |
615 | if (!dln2->rx_urb[i]) | |
616 | return -ENOMEM; | |
617 | ||
618 | usb_fill_bulk_urb(dln2->rx_urb[i], dln2->usb_dev, | |
619 | usb_rcvbulkpipe(dln2->usb_dev, dln2->ep_in), | |
620 | dln2->rx_buf[i], rx_max_size, dln2_rx, dln2); | |
ee231aee OP |
621 | } |
622 | ||
623 | return 0; | |
624 | } | |
338a1281 | 625 | |
ee231aee OP |
626 | static int dln2_start_rx_urbs(struct dln2_dev *dln2, gfp_t gfp) |
627 | { | |
628 | struct device *dev = &dln2->interface->dev; | |
629 | int ret; | |
630 | int i; | |
631 | ||
632 | for (i = 0; i < DLN2_MAX_URBS; i++) { | |
633 | ret = usb_submit_urb(dln2->rx_urb[i], gfp); | |
338a1281 OP |
634 | if (ret < 0) { |
635 | dev_err(dev, "failed to submit RX URB: %d\n", ret); | |
636 | return ret; | |
637 | } | |
638 | } | |
639 | ||
640 | return 0; | |
641 | } | |
642 | ||
643 | static struct dln2_platform_data dln2_pdata_gpio = { | |
644 | .handle = DLN2_HANDLE_GPIO, | |
645 | }; | |
646 | ||
647 | /* Only one I2C port seems to be supported on current hardware */ | |
648 | static struct dln2_platform_data dln2_pdata_i2c = { | |
649 | .handle = DLN2_HANDLE_I2C, | |
650 | .port = 0, | |
651 | }; | |
652 | ||
21cf3318 LP |
653 | /* Only one SPI port supported */ |
654 | static struct dln2_platform_data dln2_pdata_spi = { | |
655 | .handle = DLN2_HANDLE_SPI, | |
656 | .port = 0, | |
657 | }; | |
658 | ||
338a1281 OP |
659 | static const struct mfd_cell dln2_devs[] = { |
660 | { | |
661 | .name = "dln2-gpio", | |
662 | .platform_data = &dln2_pdata_gpio, | |
663 | .pdata_size = sizeof(struct dln2_platform_data), | |
664 | }, | |
665 | { | |
666 | .name = "dln2-i2c", | |
667 | .platform_data = &dln2_pdata_i2c, | |
668 | .pdata_size = sizeof(struct dln2_platform_data), | |
669 | }, | |
21cf3318 LP |
670 | { |
671 | .name = "dln2-spi", | |
672 | .platform_data = &dln2_pdata_spi, | |
673 | .pdata_size = sizeof(struct dln2_platform_data), | |
674 | }, | |
338a1281 OP |
675 | }; |
676 | ||
ee231aee | 677 | static void dln2_stop(struct dln2_dev *dln2) |
338a1281 | 678 | { |
338a1281 OP |
679 | int i, j; |
680 | ||
681 | /* don't allow starting new transfers */ | |
682 | spin_lock(&dln2->disconnect_lock); | |
683 | dln2->disconnect = true; | |
684 | spin_unlock(&dln2->disconnect_lock); | |
685 | ||
686 | /* cancel in progress transfers */ | |
687 | for (i = 0; i < DLN2_HANDLES; i++) { | |
688 | struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[i]; | |
689 | unsigned long flags; | |
690 | ||
691 | spin_lock_irqsave(&rxs->lock, flags); | |
692 | ||
693 | /* cancel all response waiters */ | |
694 | for (j = 0; j < DLN2_MAX_RX_SLOTS; j++) { | |
695 | struct dln2_rx_context *rxc = &rxs->slots[j]; | |
696 | ||
697 | if (rxc->in_use) | |
698 | complete(&rxc->done); | |
699 | } | |
700 | ||
701 | spin_unlock_irqrestore(&rxs->lock, flags); | |
702 | } | |
703 | ||
704 | /* wait for transfers to end */ | |
705 | wait_event(dln2->disconnect_wq, !dln2->active_transfers); | |
706 | ||
ee231aee OP |
707 | dln2_stop_rx_urbs(dln2); |
708 | } | |
709 | ||
710 | static void dln2_disconnect(struct usb_interface *interface) | |
711 | { | |
712 | struct dln2_dev *dln2 = usb_get_intfdata(interface); | |
713 | ||
714 | dln2_stop(dln2); | |
715 | ||
338a1281 OP |
716 | mfd_remove_devices(&interface->dev); |
717 | ||
718 | dln2_free(dln2); | |
719 | } | |
720 | ||
721 | static int dln2_probe(struct usb_interface *interface, | |
722 | const struct usb_device_id *usb_id) | |
723 | { | |
724 | struct usb_host_interface *hostif = interface->cur_altsetting; | |
725 | struct device *dev = &interface->dev; | |
726 | struct dln2_dev *dln2; | |
727 | int ret; | |
728 | int i, j; | |
729 | ||
730 | if (hostif->desc.bInterfaceNumber != 0 || | |
731 | hostif->desc.bNumEndpoints < 2) | |
732 | return -ENODEV; | |
733 | ||
734 | dln2 = kzalloc(sizeof(*dln2), GFP_KERNEL); | |
735 | if (!dln2) | |
736 | return -ENOMEM; | |
737 | ||
738 | dln2->ep_out = hostif->endpoint[0].desc.bEndpointAddress; | |
739 | dln2->ep_in = hostif->endpoint[1].desc.bEndpointAddress; | |
740 | dln2->usb_dev = usb_get_dev(interface_to_usbdev(interface)); | |
741 | dln2->interface = interface; | |
742 | usb_set_intfdata(interface, dln2); | |
743 | init_waitqueue_head(&dln2->disconnect_wq); | |
744 | ||
745 | for (i = 0; i < DLN2_HANDLES; i++) { | |
746 | init_waitqueue_head(&dln2->mod_rx_slots[i].wq); | |
747 | spin_lock_init(&dln2->mod_rx_slots[i].lock); | |
748 | for (j = 0; j < DLN2_MAX_RX_SLOTS; j++) | |
749 | init_completion(&dln2->mod_rx_slots[i].slots[j].done); | |
750 | } | |
751 | ||
752 | spin_lock_init(&dln2->event_cb_lock); | |
753 | spin_lock_init(&dln2->disconnect_lock); | |
754 | INIT_LIST_HEAD(&dln2->event_cb_list); | |
755 | ||
756 | ret = dln2_setup_rx_urbs(dln2, hostif); | |
757 | if (ret) | |
ee231aee OP |
758 | goto out_free; |
759 | ||
760 | ret = dln2_start_rx_urbs(dln2, GFP_KERNEL); | |
761 | if (ret) | |
762 | goto out_stop_rx; | |
338a1281 OP |
763 | |
764 | ret = dln2_hw_init(dln2); | |
765 | if (ret < 0) { | |
766 | dev_err(dev, "failed to initialize hardware\n"); | |
ee231aee | 767 | goto out_stop_rx; |
338a1281 OP |
768 | } |
769 | ||
770 | ret = mfd_add_hotplug_devices(dev, dln2_devs, ARRAY_SIZE(dln2_devs)); | |
771 | if (ret != 0) { | |
772 | dev_err(dev, "failed to add mfd devices to core\n"); | |
ee231aee | 773 | goto out_stop_rx; |
338a1281 OP |
774 | } |
775 | ||
776 | return 0; | |
777 | ||
ee231aee OP |
778 | out_stop_rx: |
779 | dln2_stop_rx_urbs(dln2); | |
780 | ||
781 | out_free: | |
338a1281 OP |
782 | dln2_free(dln2); |
783 | ||
784 | return ret; | |
785 | } | |
786 | ||
3daa122d OP |
787 | static int dln2_suspend(struct usb_interface *iface, pm_message_t message) |
788 | { | |
789 | struct dln2_dev *dln2 = usb_get_intfdata(iface); | |
790 | ||
791 | dln2_stop(dln2); | |
792 | ||
793 | return 0; | |
794 | } | |
795 | ||
796 | static int dln2_resume(struct usb_interface *iface) | |
797 | { | |
798 | struct dln2_dev *dln2 = usb_get_intfdata(iface); | |
799 | ||
800 | dln2->disconnect = false; | |
801 | ||
802 | return dln2_start_rx_urbs(dln2, GFP_NOIO); | |
803 | } | |
804 | ||
338a1281 OP |
805 | static const struct usb_device_id dln2_table[] = { |
806 | { USB_DEVICE(0xa257, 0x2013) }, | |
807 | { } | |
808 | }; | |
809 | ||
810 | MODULE_DEVICE_TABLE(usb, dln2_table); | |
811 | ||
812 | static struct usb_driver dln2_driver = { | |
813 | .name = "dln2", | |
814 | .probe = dln2_probe, | |
815 | .disconnect = dln2_disconnect, | |
816 | .id_table = dln2_table, | |
3daa122d OP |
817 | .suspend = dln2_suspend, |
818 | .resume = dln2_resume, | |
338a1281 OP |
819 | }; |
820 | ||
821 | module_usb_driver(dln2_driver); | |
822 | ||
823 | MODULE_AUTHOR("Octavian Purdila <octavian.purdila@intel.com>"); | |
824 | MODULE_DESCRIPTION("Core driver for the Diolan DLN2 interface adapter"); | |
825 | MODULE_LICENSE("GPL v2"); |