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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 | ||
fb945c95 AS |
93 | enum dln2_endpoint { |
94 | DLN2_EP_OUT = 0, | |
95 | DLN2_EP_IN = 1, | |
96 | }; | |
97 | ||
338a1281 OP |
98 | struct dln2_dev { |
99 | struct usb_device *usb_dev; | |
100 | struct usb_interface *interface; | |
101 | u8 ep_in; | |
102 | u8 ep_out; | |
103 | ||
104 | struct urb *rx_urb[DLN2_MAX_URBS]; | |
105 | void *rx_buf[DLN2_MAX_URBS]; | |
106 | ||
107 | struct dln2_mod_rx_slots mod_rx_slots[DLN2_HANDLES]; | |
108 | ||
109 | struct list_head event_cb_list; | |
110 | spinlock_t event_cb_lock; | |
111 | ||
112 | bool disconnect; | |
113 | int active_transfers; | |
114 | wait_queue_head_t disconnect_wq; | |
115 | spinlock_t disconnect_lock; | |
116 | }; | |
117 | ||
118 | struct dln2_event_cb_entry { | |
119 | struct list_head list; | |
120 | u16 id; | |
121 | struct platform_device *pdev; | |
122 | dln2_event_cb_t callback; | |
123 | }; | |
124 | ||
125 | int dln2_register_event_cb(struct platform_device *pdev, u16 id, | |
126 | dln2_event_cb_t event_cb) | |
127 | { | |
128 | struct dln2_dev *dln2 = dev_get_drvdata(pdev->dev.parent); | |
129 | struct dln2_event_cb_entry *i, *entry; | |
130 | unsigned long flags; | |
131 | int ret = 0; | |
132 | ||
133 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
134 | if (!entry) | |
135 | return -ENOMEM; | |
136 | ||
137 | entry->id = id; | |
138 | entry->callback = event_cb; | |
139 | entry->pdev = pdev; | |
140 | ||
141 | spin_lock_irqsave(&dln2->event_cb_lock, flags); | |
142 | ||
143 | list_for_each_entry(i, &dln2->event_cb_list, list) { | |
144 | if (i->id == id) { | |
145 | ret = -EBUSY; | |
146 | break; | |
147 | } | |
148 | } | |
149 | ||
150 | if (!ret) | |
151 | list_add_rcu(&entry->list, &dln2->event_cb_list); | |
152 | ||
153 | spin_unlock_irqrestore(&dln2->event_cb_lock, flags); | |
154 | ||
155 | if (ret) | |
156 | kfree(entry); | |
157 | ||
158 | return ret; | |
159 | } | |
160 | EXPORT_SYMBOL(dln2_register_event_cb); | |
161 | ||
162 | void dln2_unregister_event_cb(struct platform_device *pdev, u16 id) | |
163 | { | |
164 | struct dln2_dev *dln2 = dev_get_drvdata(pdev->dev.parent); | |
165 | struct dln2_event_cb_entry *i; | |
166 | unsigned long flags; | |
167 | bool found = false; | |
168 | ||
169 | spin_lock_irqsave(&dln2->event_cb_lock, flags); | |
170 | ||
171 | list_for_each_entry(i, &dln2->event_cb_list, list) { | |
172 | if (i->id == id) { | |
173 | list_del_rcu(&i->list); | |
174 | found = true; | |
175 | break; | |
176 | } | |
177 | } | |
178 | ||
179 | spin_unlock_irqrestore(&dln2->event_cb_lock, flags); | |
180 | ||
181 | if (found) { | |
182 | synchronize_rcu(); | |
183 | kfree(i); | |
184 | } | |
185 | } | |
186 | EXPORT_SYMBOL(dln2_unregister_event_cb); | |
187 | ||
188 | /* | |
189 | * Returns true if a valid transfer slot is found. In this case the URB must not | |
190 | * be resubmitted immediately in dln2_rx as we need the data when dln2_transfer | |
191 | * is woke up. It will be resubmitted there. | |
192 | */ | |
193 | static bool dln2_transfer_complete(struct dln2_dev *dln2, struct urb *urb, | |
194 | u16 handle, u16 rx_slot) | |
195 | { | |
196 | struct device *dev = &dln2->interface->dev; | |
197 | struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[handle]; | |
198 | struct dln2_rx_context *rxc; | |
50d44f82 | 199 | unsigned long flags; |
338a1281 OP |
200 | bool valid_slot = false; |
201 | ||
00ee7a37 OP |
202 | if (rx_slot >= DLN2_MAX_RX_SLOTS) |
203 | goto out; | |
204 | ||
338a1281 OP |
205 | rxc = &rxs->slots[rx_slot]; |
206 | ||
50d44f82 | 207 | spin_lock_irqsave(&rxs->lock, flags); |
338a1281 OP |
208 | if (rxc->in_use && !rxc->urb) { |
209 | rxc->urb = urb; | |
210 | complete(&rxc->done); | |
211 | valid_slot = true; | |
212 | } | |
50d44f82 | 213 | spin_unlock_irqrestore(&rxs->lock, flags); |
338a1281 | 214 | |
00ee7a37 | 215 | out: |
338a1281 OP |
216 | if (!valid_slot) |
217 | dev_warn(dev, "bad/late response %d/%d\n", handle, rx_slot); | |
218 | ||
219 | return valid_slot; | |
220 | } | |
221 | ||
222 | static void dln2_run_event_callbacks(struct dln2_dev *dln2, u16 id, u16 echo, | |
223 | void *data, int len) | |
224 | { | |
225 | struct dln2_event_cb_entry *i; | |
226 | ||
227 | rcu_read_lock(); | |
228 | ||
229 | list_for_each_entry_rcu(i, &dln2->event_cb_list, list) { | |
230 | if (i->id == id) { | |
231 | i->callback(i->pdev, echo, data, len); | |
232 | break; | |
233 | } | |
234 | } | |
235 | ||
236 | rcu_read_unlock(); | |
237 | } | |
238 | ||
239 | static void dln2_rx(struct urb *urb) | |
240 | { | |
241 | struct dln2_dev *dln2 = urb->context; | |
242 | struct dln2_header *hdr = urb->transfer_buffer; | |
243 | struct device *dev = &dln2->interface->dev; | |
244 | u16 id, echo, handle, size; | |
245 | u8 *data; | |
246 | int len; | |
247 | int err; | |
248 | ||
249 | switch (urb->status) { | |
250 | case 0: | |
251 | /* success */ | |
252 | break; | |
253 | case -ECONNRESET: | |
254 | case -ENOENT: | |
255 | case -ESHUTDOWN: | |
256 | case -EPIPE: | |
257 | /* this urb is terminated, clean up */ | |
258 | dev_dbg(dev, "urb shutting down with status %d\n", urb->status); | |
259 | return; | |
260 | default: | |
261 | dev_dbg(dev, "nonzero urb status received %d\n", urb->status); | |
262 | goto out; | |
263 | } | |
264 | ||
265 | if (urb->actual_length < sizeof(struct dln2_header)) { | |
266 | dev_err(dev, "short response: %d\n", urb->actual_length); | |
267 | goto out; | |
268 | } | |
269 | ||
270 | handle = le16_to_cpu(hdr->handle); | |
271 | id = le16_to_cpu(hdr->id); | |
272 | echo = le16_to_cpu(hdr->echo); | |
273 | size = le16_to_cpu(hdr->size); | |
274 | ||
275 | if (size != urb->actual_length) { | |
276 | dev_err(dev, "size mismatch: handle %x cmd %x echo %x size %d actual %d\n", | |
277 | handle, id, echo, size, urb->actual_length); | |
278 | goto out; | |
279 | } | |
280 | ||
281 | if (handle >= DLN2_HANDLES) { | |
282 | dev_warn(dev, "invalid handle %d\n", handle); | |
283 | goto out; | |
284 | } | |
285 | ||
286 | data = urb->transfer_buffer + sizeof(struct dln2_header); | |
287 | len = urb->actual_length - sizeof(struct dln2_header); | |
288 | ||
289 | if (handle == DLN2_HANDLE_EVENT) { | |
290 | dln2_run_event_callbacks(dln2, id, echo, data, len); | |
291 | } else { | |
292 | /* URB will be re-submitted in _dln2_transfer (free_rx_slot) */ | |
293 | if (dln2_transfer_complete(dln2, urb, handle, echo)) | |
294 | return; | |
295 | } | |
296 | ||
297 | out: | |
298 | err = usb_submit_urb(urb, GFP_ATOMIC); | |
299 | if (err < 0) | |
300 | dev_err(dev, "failed to resubmit RX URB: %d\n", err); | |
301 | } | |
302 | ||
303 | static void *dln2_prep_buf(u16 handle, u16 cmd, u16 echo, const void *obuf, | |
304 | int *obuf_len, gfp_t gfp) | |
305 | { | |
306 | int len; | |
307 | void *buf; | |
308 | struct dln2_header *hdr; | |
309 | ||
310 | len = *obuf_len + sizeof(*hdr); | |
311 | buf = kmalloc(len, gfp); | |
312 | if (!buf) | |
313 | return NULL; | |
314 | ||
315 | hdr = (struct dln2_header *)buf; | |
316 | hdr->id = cpu_to_le16(cmd); | |
317 | hdr->size = cpu_to_le16(len); | |
318 | hdr->echo = cpu_to_le16(echo); | |
319 | hdr->handle = cpu_to_le16(handle); | |
320 | ||
321 | memcpy(buf + sizeof(*hdr), obuf, *obuf_len); | |
322 | ||
323 | *obuf_len = len; | |
324 | ||
325 | return buf; | |
326 | } | |
327 | ||
328 | static int dln2_send_wait(struct dln2_dev *dln2, u16 handle, u16 cmd, u16 echo, | |
329 | const void *obuf, int obuf_len) | |
330 | { | |
331 | int ret = 0; | |
332 | int len = obuf_len; | |
333 | void *buf; | |
334 | int actual; | |
335 | ||
336 | buf = dln2_prep_buf(handle, cmd, echo, obuf, &len, GFP_KERNEL); | |
337 | if (!buf) | |
338 | return -ENOMEM; | |
339 | ||
340 | ret = usb_bulk_msg(dln2->usb_dev, | |
341 | usb_sndbulkpipe(dln2->usb_dev, dln2->ep_out), | |
342 | buf, len, &actual, DLN2_USB_TIMEOUT); | |
343 | ||
344 | kfree(buf); | |
345 | ||
346 | return ret; | |
347 | } | |
348 | ||
349 | static bool find_free_slot(struct dln2_dev *dln2, u16 handle, int *slot) | |
350 | { | |
351 | struct dln2_mod_rx_slots *rxs; | |
352 | unsigned long flags; | |
353 | ||
354 | if (dln2->disconnect) { | |
355 | *slot = -ENODEV; | |
356 | return true; | |
357 | } | |
358 | ||
359 | rxs = &dln2->mod_rx_slots[handle]; | |
360 | ||
361 | spin_lock_irqsave(&rxs->lock, flags); | |
362 | ||
363 | *slot = find_first_zero_bit(rxs->bmap, DLN2_MAX_RX_SLOTS); | |
364 | ||
365 | if (*slot < DLN2_MAX_RX_SLOTS) { | |
366 | struct dln2_rx_context *rxc = &rxs->slots[*slot]; | |
367 | ||
368 | set_bit(*slot, rxs->bmap); | |
369 | rxc->in_use = true; | |
370 | } | |
371 | ||
372 | spin_unlock_irqrestore(&rxs->lock, flags); | |
373 | ||
374 | return *slot < DLN2_MAX_RX_SLOTS; | |
375 | } | |
376 | ||
377 | static int alloc_rx_slot(struct dln2_dev *dln2, u16 handle) | |
378 | { | |
379 | int ret; | |
380 | int slot; | |
381 | ||
382 | /* | |
383 | * No need to timeout here, the wait is bounded by the timeout in | |
384 | * _dln2_transfer. | |
385 | */ | |
386 | ret = wait_event_interruptible(dln2->mod_rx_slots[handle].wq, | |
387 | find_free_slot(dln2, handle, &slot)); | |
388 | if (ret < 0) | |
389 | return ret; | |
390 | ||
391 | return slot; | |
392 | } | |
393 | ||
394 | static void free_rx_slot(struct dln2_dev *dln2, u16 handle, int slot) | |
395 | { | |
396 | struct dln2_mod_rx_slots *rxs; | |
397 | struct urb *urb = NULL; | |
398 | unsigned long flags; | |
399 | struct dln2_rx_context *rxc; | |
400 | ||
401 | rxs = &dln2->mod_rx_slots[handle]; | |
402 | ||
403 | spin_lock_irqsave(&rxs->lock, flags); | |
404 | ||
405 | clear_bit(slot, rxs->bmap); | |
406 | ||
407 | rxc = &rxs->slots[slot]; | |
408 | rxc->in_use = false; | |
409 | urb = rxc->urb; | |
410 | rxc->urb = NULL; | |
411 | reinit_completion(&rxc->done); | |
412 | ||
413 | spin_unlock_irqrestore(&rxs->lock, flags); | |
414 | ||
415 | if (urb) { | |
416 | int err; | |
417 | struct device *dev = &dln2->interface->dev; | |
418 | ||
419 | err = usb_submit_urb(urb, GFP_KERNEL); | |
420 | if (err < 0) | |
421 | dev_err(dev, "failed to resubmit RX URB: %d\n", err); | |
422 | } | |
423 | ||
424 | wake_up_interruptible(&rxs->wq); | |
425 | } | |
426 | ||
427 | static int _dln2_transfer(struct dln2_dev *dln2, u16 handle, u16 cmd, | |
428 | const void *obuf, unsigned obuf_len, | |
429 | void *ibuf, unsigned *ibuf_len) | |
430 | { | |
431 | int ret = 0; | |
432 | int rx_slot; | |
433 | struct dln2_response *rsp; | |
434 | struct dln2_rx_context *rxc; | |
435 | struct device *dev = &dln2->interface->dev; | |
48579a9a | 436 | const unsigned long timeout = msecs_to_jiffies(DLN2_USB_TIMEOUT); |
338a1281 | 437 | struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[handle]; |
2fc2b484 | 438 | int size; |
338a1281 OP |
439 | |
440 | spin_lock(&dln2->disconnect_lock); | |
441 | if (!dln2->disconnect) | |
442 | dln2->active_transfers++; | |
443 | else | |
444 | ret = -ENODEV; | |
445 | spin_unlock(&dln2->disconnect_lock); | |
446 | ||
447 | if (ret) | |
448 | return ret; | |
449 | ||
450 | rx_slot = alloc_rx_slot(dln2, handle); | |
451 | if (rx_slot < 0) { | |
452 | ret = rx_slot; | |
453 | goto out_decr; | |
454 | } | |
455 | ||
456 | ret = dln2_send_wait(dln2, handle, cmd, rx_slot, obuf, obuf_len); | |
457 | if (ret < 0) { | |
458 | dev_err(dev, "USB write failed: %d\n", ret); | |
459 | goto out_free_rx_slot; | |
460 | } | |
461 | ||
462 | rxc = &rxs->slots[rx_slot]; | |
463 | ||
464 | ret = wait_for_completion_interruptible_timeout(&rxc->done, timeout); | |
465 | if (ret <= 0) { | |
466 | if (!ret) | |
467 | ret = -ETIMEDOUT; | |
468 | goto out_free_rx_slot; | |
7ca2b1c6 OP |
469 | } else { |
470 | ret = 0; | |
338a1281 OP |
471 | } |
472 | ||
473 | if (dln2->disconnect) { | |
474 | ret = -ENODEV; | |
475 | goto out_free_rx_slot; | |
476 | } | |
477 | ||
478 | /* if we got here we know that the response header has been checked */ | |
479 | rsp = rxc->urb->transfer_buffer; | |
2fc2b484 | 480 | size = le16_to_cpu(rsp->hdr.size); |
338a1281 | 481 | |
2fc2b484 | 482 | if (size < sizeof(*rsp)) { |
338a1281 OP |
483 | ret = -EPROTO; |
484 | goto out_free_rx_slot; | |
485 | } | |
486 | ||
487 | if (le16_to_cpu(rsp->result) > 0x80) { | |
488 | dev_dbg(dev, "%d received response with error %d\n", | |
489 | handle, le16_to_cpu(rsp->result)); | |
490 | ret = -EREMOTEIO; | |
491 | goto out_free_rx_slot; | |
492 | } | |
493 | ||
7ca2b1c6 | 494 | if (!ibuf) |
338a1281 | 495 | goto out_free_rx_slot; |
338a1281 | 496 | |
2fc2b484 DC |
497 | if (*ibuf_len > size - sizeof(*rsp)) |
498 | *ibuf_len = size - sizeof(*rsp); | |
338a1281 OP |
499 | |
500 | memcpy(ibuf, rsp + 1, *ibuf_len); | |
501 | ||
502 | out_free_rx_slot: | |
503 | free_rx_slot(dln2, handle, rx_slot); | |
504 | out_decr: | |
505 | spin_lock(&dln2->disconnect_lock); | |
506 | dln2->active_transfers--; | |
507 | spin_unlock(&dln2->disconnect_lock); | |
508 | if (dln2->disconnect) | |
509 | wake_up(&dln2->disconnect_wq); | |
510 | ||
511 | return ret; | |
512 | } | |
513 | ||
514 | int dln2_transfer(struct platform_device *pdev, u16 cmd, | |
515 | const void *obuf, unsigned obuf_len, | |
516 | void *ibuf, unsigned *ibuf_len) | |
517 | { | |
518 | struct dln2_platform_data *dln2_pdata; | |
519 | struct dln2_dev *dln2; | |
520 | u16 handle; | |
521 | ||
522 | dln2 = dev_get_drvdata(pdev->dev.parent); | |
523 | dln2_pdata = dev_get_platdata(&pdev->dev); | |
524 | handle = dln2_pdata->handle; | |
525 | ||
526 | return _dln2_transfer(dln2, handle, cmd, obuf, obuf_len, ibuf, | |
527 | ibuf_len); | |
528 | } | |
529 | EXPORT_SYMBOL(dln2_transfer); | |
530 | ||
531 | static int dln2_check_hw(struct dln2_dev *dln2) | |
532 | { | |
533 | int ret; | |
534 | __le32 hw_type; | |
535 | int len = sizeof(hw_type); | |
536 | ||
537 | ret = _dln2_transfer(dln2, DLN2_HANDLE_CTRL, CMD_GET_DEVICE_VER, | |
538 | NULL, 0, &hw_type, &len); | |
539 | if (ret < 0) | |
540 | return ret; | |
541 | if (len < sizeof(hw_type)) | |
542 | return -EREMOTEIO; | |
543 | ||
544 | if (le32_to_cpu(hw_type) != DLN2_HW_ID) { | |
545 | dev_err(&dln2->interface->dev, "Device ID 0x%x not supported\n", | |
546 | le32_to_cpu(hw_type)); | |
547 | return -ENODEV; | |
548 | } | |
549 | ||
550 | return 0; | |
551 | } | |
552 | ||
553 | static int dln2_print_serialno(struct dln2_dev *dln2) | |
554 | { | |
555 | int ret; | |
556 | __le32 serial_no; | |
557 | int len = sizeof(serial_no); | |
558 | struct device *dev = &dln2->interface->dev; | |
559 | ||
560 | ret = _dln2_transfer(dln2, DLN2_HANDLE_CTRL, CMD_GET_DEVICE_SN, NULL, 0, | |
561 | &serial_no, &len); | |
562 | if (ret < 0) | |
563 | return ret; | |
564 | if (len < sizeof(serial_no)) | |
565 | return -EREMOTEIO; | |
566 | ||
567 | dev_info(dev, "Diolan DLN2 serial %u\n", le32_to_cpu(serial_no)); | |
568 | ||
569 | return 0; | |
570 | } | |
571 | ||
572 | static int dln2_hw_init(struct dln2_dev *dln2) | |
573 | { | |
574 | int ret; | |
575 | ||
576 | ret = dln2_check_hw(dln2); | |
577 | if (ret < 0) | |
578 | return ret; | |
579 | ||
580 | return dln2_print_serialno(dln2); | |
581 | } | |
582 | ||
583 | static void dln2_free_rx_urbs(struct dln2_dev *dln2) | |
584 | { | |
585 | int i; | |
586 | ||
587 | for (i = 0; i < DLN2_MAX_URBS; i++) { | |
338a1281 OP |
588 | usb_free_urb(dln2->rx_urb[i]); |
589 | kfree(dln2->rx_buf[i]); | |
590 | } | |
591 | } | |
592 | ||
ee231aee OP |
593 | static void dln2_stop_rx_urbs(struct dln2_dev *dln2) |
594 | { | |
595 | int i; | |
596 | ||
597 | for (i = 0; i < DLN2_MAX_URBS; i++) | |
598 | usb_kill_urb(dln2->rx_urb[i]); | |
599 | } | |
600 | ||
338a1281 OP |
601 | static void dln2_free(struct dln2_dev *dln2) |
602 | { | |
603 | dln2_free_rx_urbs(dln2); | |
604 | usb_put_dev(dln2->usb_dev); | |
605 | kfree(dln2); | |
606 | } | |
607 | ||
608 | static int dln2_setup_rx_urbs(struct dln2_dev *dln2, | |
609 | struct usb_host_interface *hostif) | |
610 | { | |
611 | int i; | |
338a1281 | 612 | const int rx_max_size = DLN2_RX_BUF_SIZE; |
338a1281 OP |
613 | |
614 | for (i = 0; i < DLN2_MAX_URBS; i++) { | |
615 | dln2->rx_buf[i] = kmalloc(rx_max_size, GFP_KERNEL); | |
616 | if (!dln2->rx_buf[i]) | |
617 | return -ENOMEM; | |
618 | ||
619 | dln2->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL); | |
620 | if (!dln2->rx_urb[i]) | |
621 | return -ENOMEM; | |
622 | ||
623 | usb_fill_bulk_urb(dln2->rx_urb[i], dln2->usb_dev, | |
624 | usb_rcvbulkpipe(dln2->usb_dev, dln2->ep_in), | |
625 | dln2->rx_buf[i], rx_max_size, dln2_rx, dln2); | |
ee231aee OP |
626 | } |
627 | ||
628 | return 0; | |
629 | } | |
338a1281 | 630 | |
ee231aee OP |
631 | static int dln2_start_rx_urbs(struct dln2_dev *dln2, gfp_t gfp) |
632 | { | |
633 | struct device *dev = &dln2->interface->dev; | |
634 | int ret; | |
635 | int i; | |
636 | ||
637 | for (i = 0; i < DLN2_MAX_URBS; i++) { | |
638 | ret = usb_submit_urb(dln2->rx_urb[i], gfp); | |
338a1281 OP |
639 | if (ret < 0) { |
640 | dev_err(dev, "failed to submit RX URB: %d\n", ret); | |
641 | return ret; | |
642 | } | |
643 | } | |
644 | ||
645 | return 0; | |
646 | } | |
647 | ||
e3fadb35 AS |
648 | enum { |
649 | DLN2_ACPI_MATCH_GPIO = 0, | |
650 | DLN2_ACPI_MATCH_I2C = 1, | |
651 | DLN2_ACPI_MATCH_SPI = 2, | |
652 | }; | |
653 | ||
338a1281 OP |
654 | static struct dln2_platform_data dln2_pdata_gpio = { |
655 | .handle = DLN2_HANDLE_GPIO, | |
656 | }; | |
657 | ||
e3fadb35 AS |
658 | static struct mfd_cell_acpi_match dln2_acpi_match_gpio = { |
659 | .adr = DLN2_ACPI_MATCH_GPIO, | |
660 | }; | |
661 | ||
338a1281 OP |
662 | /* Only one I2C port seems to be supported on current hardware */ |
663 | static struct dln2_platform_data dln2_pdata_i2c = { | |
664 | .handle = DLN2_HANDLE_I2C, | |
665 | .port = 0, | |
666 | }; | |
667 | ||
e3fadb35 AS |
668 | static struct mfd_cell_acpi_match dln2_acpi_match_i2c = { |
669 | .adr = DLN2_ACPI_MATCH_I2C, | |
670 | }; | |
671 | ||
21cf3318 LP |
672 | /* Only one SPI port supported */ |
673 | static struct dln2_platform_data dln2_pdata_spi = { | |
674 | .handle = DLN2_HANDLE_SPI, | |
675 | .port = 0, | |
676 | }; | |
677 | ||
e3fadb35 AS |
678 | static struct mfd_cell_acpi_match dln2_acpi_match_spi = { |
679 | .adr = DLN2_ACPI_MATCH_SPI, | |
680 | }; | |
681 | ||
338a1281 OP |
682 | static const struct mfd_cell dln2_devs[] = { |
683 | { | |
684 | .name = "dln2-gpio", | |
e3fadb35 | 685 | .acpi_match = &dln2_acpi_match_gpio, |
338a1281 OP |
686 | .platform_data = &dln2_pdata_gpio, |
687 | .pdata_size = sizeof(struct dln2_platform_data), | |
688 | }, | |
689 | { | |
690 | .name = "dln2-i2c", | |
e3fadb35 | 691 | .acpi_match = &dln2_acpi_match_i2c, |
338a1281 OP |
692 | .platform_data = &dln2_pdata_i2c, |
693 | .pdata_size = sizeof(struct dln2_platform_data), | |
694 | }, | |
21cf3318 LP |
695 | { |
696 | .name = "dln2-spi", | |
e3fadb35 | 697 | .acpi_match = &dln2_acpi_match_spi, |
21cf3318 LP |
698 | .platform_data = &dln2_pdata_spi, |
699 | .pdata_size = sizeof(struct dln2_platform_data), | |
700 | }, | |
338a1281 OP |
701 | }; |
702 | ||
ee231aee | 703 | static void dln2_stop(struct dln2_dev *dln2) |
338a1281 | 704 | { |
338a1281 OP |
705 | int i, j; |
706 | ||
707 | /* don't allow starting new transfers */ | |
708 | spin_lock(&dln2->disconnect_lock); | |
709 | dln2->disconnect = true; | |
710 | spin_unlock(&dln2->disconnect_lock); | |
711 | ||
712 | /* cancel in progress transfers */ | |
713 | for (i = 0; i < DLN2_HANDLES; i++) { | |
714 | struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[i]; | |
715 | unsigned long flags; | |
716 | ||
717 | spin_lock_irqsave(&rxs->lock, flags); | |
718 | ||
719 | /* cancel all response waiters */ | |
720 | for (j = 0; j < DLN2_MAX_RX_SLOTS; j++) { | |
721 | struct dln2_rx_context *rxc = &rxs->slots[j]; | |
722 | ||
723 | if (rxc->in_use) | |
724 | complete(&rxc->done); | |
725 | } | |
726 | ||
727 | spin_unlock_irqrestore(&rxs->lock, flags); | |
728 | } | |
729 | ||
730 | /* wait for transfers to end */ | |
731 | wait_event(dln2->disconnect_wq, !dln2->active_transfers); | |
732 | ||
ee231aee OP |
733 | dln2_stop_rx_urbs(dln2); |
734 | } | |
735 | ||
736 | static void dln2_disconnect(struct usb_interface *interface) | |
737 | { | |
738 | struct dln2_dev *dln2 = usb_get_intfdata(interface); | |
739 | ||
740 | dln2_stop(dln2); | |
741 | ||
338a1281 OP |
742 | mfd_remove_devices(&interface->dev); |
743 | ||
744 | dln2_free(dln2); | |
745 | } | |
746 | ||
747 | static int dln2_probe(struct usb_interface *interface, | |
748 | const struct usb_device_id *usb_id) | |
749 | { | |
750 | struct usb_host_interface *hostif = interface->cur_altsetting; | |
2b8bd606 ON |
751 | struct usb_endpoint_descriptor *epin; |
752 | struct usb_endpoint_descriptor *epout; | |
338a1281 OP |
753 | struct device *dev = &interface->dev; |
754 | struct dln2_dev *dln2; | |
755 | int ret; | |
756 | int i, j; | |
757 | ||
758 | if (hostif->desc.bInterfaceNumber != 0 || | |
759 | hostif->desc.bNumEndpoints < 2) | |
760 | return -ENODEV; | |
761 | ||
fb945c95 | 762 | epout = &hostif->endpoint[DLN2_EP_OUT].desc; |
2b8bd606 ON |
763 | if (!usb_endpoint_is_bulk_out(epout)) |
764 | return -ENODEV; | |
fb945c95 | 765 | epin = &hostif->endpoint[DLN2_EP_IN].desc; |
2b8bd606 ON |
766 | if (!usb_endpoint_is_bulk_in(epin)) |
767 | return -ENODEV; | |
768 | ||
338a1281 OP |
769 | dln2 = kzalloc(sizeof(*dln2), GFP_KERNEL); |
770 | if (!dln2) | |
771 | return -ENOMEM; | |
772 | ||
2b8bd606 ON |
773 | dln2->ep_out = epout->bEndpointAddress; |
774 | dln2->ep_in = epin->bEndpointAddress; | |
338a1281 OP |
775 | dln2->usb_dev = usb_get_dev(interface_to_usbdev(interface)); |
776 | dln2->interface = interface; | |
777 | usb_set_intfdata(interface, dln2); | |
778 | init_waitqueue_head(&dln2->disconnect_wq); | |
779 | ||
780 | for (i = 0; i < DLN2_HANDLES; i++) { | |
781 | init_waitqueue_head(&dln2->mod_rx_slots[i].wq); | |
782 | spin_lock_init(&dln2->mod_rx_slots[i].lock); | |
783 | for (j = 0; j < DLN2_MAX_RX_SLOTS; j++) | |
784 | init_completion(&dln2->mod_rx_slots[i].slots[j].done); | |
785 | } | |
786 | ||
787 | spin_lock_init(&dln2->event_cb_lock); | |
788 | spin_lock_init(&dln2->disconnect_lock); | |
789 | INIT_LIST_HEAD(&dln2->event_cb_list); | |
790 | ||
791 | ret = dln2_setup_rx_urbs(dln2, hostif); | |
792 | if (ret) | |
ee231aee OP |
793 | goto out_free; |
794 | ||
795 | ret = dln2_start_rx_urbs(dln2, GFP_KERNEL); | |
796 | if (ret) | |
797 | goto out_stop_rx; | |
338a1281 OP |
798 | |
799 | ret = dln2_hw_init(dln2); | |
800 | if (ret < 0) { | |
801 | dev_err(dev, "failed to initialize hardware\n"); | |
ee231aee | 802 | goto out_stop_rx; |
338a1281 OP |
803 | } |
804 | ||
805 | ret = mfd_add_hotplug_devices(dev, dln2_devs, ARRAY_SIZE(dln2_devs)); | |
806 | if (ret != 0) { | |
807 | dev_err(dev, "failed to add mfd devices to core\n"); | |
ee231aee | 808 | goto out_stop_rx; |
338a1281 OP |
809 | } |
810 | ||
811 | return 0; | |
812 | ||
ee231aee OP |
813 | out_stop_rx: |
814 | dln2_stop_rx_urbs(dln2); | |
815 | ||
816 | out_free: | |
338a1281 OP |
817 | dln2_free(dln2); |
818 | ||
819 | return ret; | |
820 | } | |
821 | ||
3daa122d OP |
822 | static int dln2_suspend(struct usb_interface *iface, pm_message_t message) |
823 | { | |
824 | struct dln2_dev *dln2 = usb_get_intfdata(iface); | |
825 | ||
826 | dln2_stop(dln2); | |
827 | ||
828 | return 0; | |
829 | } | |
830 | ||
831 | static int dln2_resume(struct usb_interface *iface) | |
832 | { | |
833 | struct dln2_dev *dln2 = usb_get_intfdata(iface); | |
834 | ||
835 | dln2->disconnect = false; | |
836 | ||
837 | return dln2_start_rx_urbs(dln2, GFP_NOIO); | |
838 | } | |
839 | ||
338a1281 OP |
840 | static const struct usb_device_id dln2_table[] = { |
841 | { USB_DEVICE(0xa257, 0x2013) }, | |
842 | { } | |
843 | }; | |
844 | ||
845 | MODULE_DEVICE_TABLE(usb, dln2_table); | |
846 | ||
847 | static struct usb_driver dln2_driver = { | |
848 | .name = "dln2", | |
849 | .probe = dln2_probe, | |
850 | .disconnect = dln2_disconnect, | |
851 | .id_table = dln2_table, | |
3daa122d OP |
852 | .suspend = dln2_suspend, |
853 | .resume = dln2_resume, | |
338a1281 OP |
854 | }; |
855 | ||
856 | module_usb_driver(dln2_driver); | |
857 | ||
858 | MODULE_AUTHOR("Octavian Purdila <octavian.purdila@intel.com>"); | |
859 | MODULE_DESCRIPTION("Core driver for the Diolan DLN2 interface adapter"); | |
860 | MODULE_LICENSE("GPL v2"); |