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2b27bdcc | 1 | // SPDX-License-Identifier: GPL-2.0-only |
7f62fe8a KV |
2 | /* |
3 | * cmt_speech.c - HSI CMT speech driver | |
4 | * | |
5 | * Copyright (C) 2008,2009,2010 Nokia Corporation. All rights reserved. | |
6 | * | |
7 | * Contact: Kai Vehmanen <kai.vehmanen@nokia.com> | |
8 | * Original author: Peter Ujfalusi <peter.ujfalusi@nokia.com> | |
7f62fe8a KV |
9 | */ |
10 | ||
11 | #include <linux/errno.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/types.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/device.h> | |
16 | #include <linux/miscdevice.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/fs.h> | |
20 | #include <linux/poll.h> | |
174cd4b1 | 21 | #include <linux/sched/signal.h> |
7f62fe8a KV |
22 | #include <linux/ioctl.h> |
23 | #include <linux/uaccess.h> | |
24 | #include <linux/pm_qos.h> | |
25 | #include <linux/hsi/hsi.h> | |
26 | #include <linux/hsi/ssi_protocol.h> | |
27 | #include <linux/hsi/cs-protocol.h> | |
28 | ||
29 | #define CS_MMAP_SIZE PAGE_SIZE | |
30 | ||
31 | struct char_queue { | |
32 | struct list_head list; | |
33 | u32 msg; | |
34 | }; | |
35 | ||
36 | struct cs_char { | |
37 | unsigned int opened; | |
38 | struct hsi_client *cl; | |
39 | struct cs_hsi_iface *hi; | |
40 | struct list_head chardev_queue; | |
41 | struct list_head dataind_queue; | |
42 | int dataind_pending; | |
43 | /* mmap things */ | |
44 | unsigned long mmap_base; | |
45 | unsigned long mmap_size; | |
46 | spinlock_t lock; | |
47 | struct fasync_struct *async_queue; | |
48 | wait_queue_head_t wait; | |
49 | /* hsi channel ids */ | |
50 | int channel_id_cmd; | |
51 | int channel_id_data; | |
52 | }; | |
53 | ||
54 | #define SSI_CHANNEL_STATE_READING 1 | |
55 | #define SSI_CHANNEL_STATE_WRITING (1 << 1) | |
56 | #define SSI_CHANNEL_STATE_POLL (1 << 2) | |
57 | #define SSI_CHANNEL_STATE_ERROR (1 << 3) | |
58 | ||
59 | #define TARGET_MASK 0xf000000 | |
60 | #define TARGET_REMOTE (1 << CS_DOMAIN_SHIFT) | |
61 | #define TARGET_LOCAL 0 | |
62 | ||
63 | /* Number of pre-allocated commands buffers */ | |
64 | #define CS_MAX_CMDS 4 | |
65 | ||
66 | /* | |
67 | * During data transfers, transactions must be handled | |
68 | * within 20ms (fixed value in cmtspeech HSI protocol) | |
69 | */ | |
70 | #define CS_QOS_LATENCY_FOR_DATA_USEC 20000 | |
71 | ||
72 | /* Timeout to wait for pending HSI transfers to complete */ | |
73 | #define CS_HSI_TRANSFER_TIMEOUT_MS 500 | |
74 | ||
75 | ||
76 | #define RX_PTR_BOUNDARY_SHIFT 8 | |
77 | #define RX_PTR_MAX_SHIFT (RX_PTR_BOUNDARY_SHIFT + \ | |
78 | CS_MAX_BUFFERS_SHIFT) | |
79 | struct cs_hsi_iface { | |
80 | struct hsi_client *cl; | |
81 | struct hsi_client *master; | |
82 | ||
83 | unsigned int iface_state; | |
84 | unsigned int wakeline_state; | |
85 | unsigned int control_state; | |
86 | unsigned int data_state; | |
87 | ||
88 | /* state exposed to application */ | |
89 | struct cs_mmap_config_block *mmap_cfg; | |
90 | ||
91 | unsigned long mmap_base; | |
92 | unsigned long mmap_size; | |
93 | ||
94 | unsigned int rx_slot; | |
95 | unsigned int tx_slot; | |
96 | ||
97 | /* note: for security reasons, we do not trust the contents of | |
98 | * mmap_cfg, but instead duplicate the variables here */ | |
99 | unsigned int buf_size; | |
100 | unsigned int rx_bufs; | |
101 | unsigned int tx_bufs; | |
102 | unsigned int rx_ptr_boundary; | |
103 | unsigned int rx_offsets[CS_MAX_BUFFERS]; | |
104 | unsigned int tx_offsets[CS_MAX_BUFFERS]; | |
105 | ||
106 | /* size of aligned memory blocks */ | |
107 | unsigned int slot_size; | |
108 | unsigned int flags; | |
109 | ||
110 | struct list_head cmdqueue; | |
111 | ||
112 | struct hsi_msg *data_rx_msg; | |
113 | struct hsi_msg *data_tx_msg; | |
114 | wait_queue_head_t datawait; | |
115 | ||
116 | struct pm_qos_request pm_qos_req; | |
117 | ||
118 | spinlock_t lock; | |
119 | }; | |
120 | ||
121 | static struct cs_char cs_char_data; | |
122 | ||
123 | static void cs_hsi_read_on_control(struct cs_hsi_iface *hi); | |
124 | static void cs_hsi_read_on_data(struct cs_hsi_iface *hi); | |
125 | ||
126 | static inline void rx_ptr_shift_too_big(void) | |
127 | { | |
128 | BUILD_BUG_ON((1LLU << RX_PTR_MAX_SHIFT) > UINT_MAX); | |
129 | } | |
130 | ||
131 | static void cs_notify(u32 message, struct list_head *head) | |
132 | { | |
133 | struct char_queue *entry; | |
134 | ||
135 | spin_lock(&cs_char_data.lock); | |
136 | ||
137 | if (!cs_char_data.opened) { | |
138 | spin_unlock(&cs_char_data.lock); | |
139 | goto out; | |
140 | } | |
141 | ||
142 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); | |
143 | if (!entry) { | |
144 | dev_err(&cs_char_data.cl->device, | |
145 | "Can't allocate new entry for the queue.\n"); | |
146 | spin_unlock(&cs_char_data.lock); | |
147 | goto out; | |
148 | } | |
149 | ||
150 | entry->msg = message; | |
151 | list_add_tail(&entry->list, head); | |
152 | ||
153 | spin_unlock(&cs_char_data.lock); | |
154 | ||
155 | wake_up_interruptible(&cs_char_data.wait); | |
156 | kill_fasync(&cs_char_data.async_queue, SIGIO, POLL_IN); | |
157 | ||
158 | out: | |
159 | return; | |
160 | } | |
161 | ||
162 | static u32 cs_pop_entry(struct list_head *head) | |
163 | { | |
164 | struct char_queue *entry; | |
165 | u32 data; | |
166 | ||
167 | entry = list_entry(head->next, struct char_queue, list); | |
168 | data = entry->msg; | |
169 | list_del(&entry->list); | |
170 | kfree(entry); | |
171 | ||
172 | return data; | |
173 | } | |
174 | ||
175 | static void cs_notify_control(u32 message) | |
176 | { | |
177 | cs_notify(message, &cs_char_data.chardev_queue); | |
178 | } | |
179 | ||
180 | static void cs_notify_data(u32 message, int maxlength) | |
181 | { | |
182 | cs_notify(message, &cs_char_data.dataind_queue); | |
183 | ||
184 | spin_lock(&cs_char_data.lock); | |
185 | cs_char_data.dataind_pending++; | |
186 | while (cs_char_data.dataind_pending > maxlength && | |
187 | !list_empty(&cs_char_data.dataind_queue)) { | |
188 | dev_dbg(&cs_char_data.cl->device, "data notification " | |
189 | "queue overrun (%u entries)\n", cs_char_data.dataind_pending); | |
190 | ||
191 | cs_pop_entry(&cs_char_data.dataind_queue); | |
192 | cs_char_data.dataind_pending--; | |
193 | } | |
194 | spin_unlock(&cs_char_data.lock); | |
195 | } | |
196 | ||
197 | static inline void cs_set_cmd(struct hsi_msg *msg, u32 cmd) | |
198 | { | |
199 | u32 *data = sg_virt(msg->sgt.sgl); | |
200 | *data = cmd; | |
201 | } | |
202 | ||
203 | static inline u32 cs_get_cmd(struct hsi_msg *msg) | |
204 | { | |
205 | u32 *data = sg_virt(msg->sgt.sgl); | |
206 | return *data; | |
207 | } | |
208 | ||
209 | static void cs_release_cmd(struct hsi_msg *msg) | |
210 | { | |
211 | struct cs_hsi_iface *hi = msg->context; | |
212 | ||
213 | list_add_tail(&msg->link, &hi->cmdqueue); | |
214 | } | |
215 | ||
216 | static void cs_cmd_destructor(struct hsi_msg *msg) | |
217 | { | |
218 | struct cs_hsi_iface *hi = msg->context; | |
219 | ||
220 | spin_lock(&hi->lock); | |
221 | ||
222 | dev_dbg(&cs_char_data.cl->device, "control cmd destructor\n"); | |
223 | ||
224 | if (hi->iface_state != CS_STATE_CLOSED) | |
225 | dev_err(&hi->cl->device, "Cmd flushed while driver active\n"); | |
226 | ||
227 | if (msg->ttype == HSI_MSG_READ) | |
228 | hi->control_state &= | |
229 | ~(SSI_CHANNEL_STATE_POLL | SSI_CHANNEL_STATE_READING); | |
230 | else if (msg->ttype == HSI_MSG_WRITE && | |
231 | hi->control_state & SSI_CHANNEL_STATE_WRITING) | |
232 | hi->control_state &= ~SSI_CHANNEL_STATE_WRITING; | |
233 | ||
234 | cs_release_cmd(msg); | |
235 | ||
236 | spin_unlock(&hi->lock); | |
237 | } | |
238 | ||
239 | static struct hsi_msg *cs_claim_cmd(struct cs_hsi_iface* ssi) | |
240 | { | |
241 | struct hsi_msg *msg; | |
242 | ||
243 | BUG_ON(list_empty(&ssi->cmdqueue)); | |
244 | ||
245 | msg = list_first_entry(&ssi->cmdqueue, struct hsi_msg, link); | |
246 | list_del(&msg->link); | |
247 | msg->destructor = cs_cmd_destructor; | |
248 | ||
249 | return msg; | |
250 | } | |
251 | ||
252 | static void cs_free_cmds(struct cs_hsi_iface *ssi) | |
253 | { | |
254 | struct hsi_msg *msg, *tmp; | |
255 | ||
256 | list_for_each_entry_safe(msg, tmp, &ssi->cmdqueue, link) { | |
257 | list_del(&msg->link); | |
258 | msg->destructor = NULL; | |
259 | kfree(sg_virt(msg->sgt.sgl)); | |
260 | hsi_free_msg(msg); | |
261 | } | |
262 | } | |
263 | ||
264 | static int cs_alloc_cmds(struct cs_hsi_iface *hi) | |
265 | { | |
266 | struct hsi_msg *msg; | |
267 | u32 *buf; | |
268 | unsigned int i; | |
269 | ||
270 | INIT_LIST_HEAD(&hi->cmdqueue); | |
271 | ||
272 | for (i = 0; i < CS_MAX_CMDS; i++) { | |
273 | msg = hsi_alloc_msg(1, GFP_KERNEL); | |
274 | if (!msg) | |
275 | goto out; | |
276 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
277 | if (!buf) { | |
278 | hsi_free_msg(msg); | |
279 | goto out; | |
280 | } | |
281 | sg_init_one(msg->sgt.sgl, buf, sizeof(*buf)); | |
282 | msg->channel = cs_char_data.channel_id_cmd; | |
283 | msg->context = hi; | |
284 | list_add_tail(&msg->link, &hi->cmdqueue); | |
285 | } | |
286 | ||
287 | return 0; | |
288 | ||
289 | out: | |
290 | cs_free_cmds(hi); | |
291 | return -ENOMEM; | |
292 | } | |
293 | ||
294 | static void cs_hsi_data_destructor(struct hsi_msg *msg) | |
295 | { | |
296 | struct cs_hsi_iface *hi = msg->context; | |
297 | const char *dir = (msg->ttype == HSI_MSG_READ) ? "TX" : "RX"; | |
298 | ||
299 | dev_dbg(&cs_char_data.cl->device, "Freeing data %s message\n", dir); | |
300 | ||
301 | spin_lock(&hi->lock); | |
302 | if (hi->iface_state != CS_STATE_CLOSED) | |
303 | dev_err(&cs_char_data.cl->device, | |
304 | "Data %s flush while device active\n", dir); | |
305 | if (msg->ttype == HSI_MSG_READ) | |
306 | hi->data_state &= | |
307 | ~(SSI_CHANNEL_STATE_POLL | SSI_CHANNEL_STATE_READING); | |
308 | else | |
309 | hi->data_state &= ~SSI_CHANNEL_STATE_WRITING; | |
310 | ||
311 | msg->status = HSI_STATUS_COMPLETED; | |
312 | if (unlikely(waitqueue_active(&hi->datawait))) | |
313 | wake_up_interruptible(&hi->datawait); | |
314 | ||
315 | spin_unlock(&hi->lock); | |
316 | } | |
317 | ||
318 | static int cs_hsi_alloc_data(struct cs_hsi_iface *hi) | |
319 | { | |
320 | struct hsi_msg *txmsg, *rxmsg; | |
321 | int res = 0; | |
322 | ||
323 | rxmsg = hsi_alloc_msg(1, GFP_KERNEL); | |
324 | if (!rxmsg) { | |
325 | res = -ENOMEM; | |
326 | goto out1; | |
327 | } | |
328 | rxmsg->channel = cs_char_data.channel_id_data; | |
329 | rxmsg->destructor = cs_hsi_data_destructor; | |
330 | rxmsg->context = hi; | |
331 | ||
332 | txmsg = hsi_alloc_msg(1, GFP_KERNEL); | |
333 | if (!txmsg) { | |
334 | res = -ENOMEM; | |
335 | goto out2; | |
336 | } | |
337 | txmsg->channel = cs_char_data.channel_id_data; | |
338 | txmsg->destructor = cs_hsi_data_destructor; | |
339 | txmsg->context = hi; | |
340 | ||
341 | hi->data_rx_msg = rxmsg; | |
342 | hi->data_tx_msg = txmsg; | |
343 | ||
344 | return 0; | |
345 | ||
346 | out2: | |
347 | hsi_free_msg(rxmsg); | |
348 | out1: | |
349 | return res; | |
350 | } | |
351 | ||
352 | static void cs_hsi_free_data_msg(struct hsi_msg *msg) | |
353 | { | |
354 | WARN_ON(msg->status != HSI_STATUS_COMPLETED && | |
355 | msg->status != HSI_STATUS_ERROR); | |
356 | hsi_free_msg(msg); | |
357 | } | |
358 | ||
359 | static void cs_hsi_free_data(struct cs_hsi_iface *hi) | |
360 | { | |
361 | cs_hsi_free_data_msg(hi->data_rx_msg); | |
362 | cs_hsi_free_data_msg(hi->data_tx_msg); | |
363 | } | |
364 | ||
365 | static inline void __cs_hsi_error_pre(struct cs_hsi_iface *hi, | |
366 | struct hsi_msg *msg, const char *info, | |
367 | unsigned int *state) | |
368 | { | |
369 | spin_lock(&hi->lock); | |
370 | dev_err(&hi->cl->device, "HSI %s error, msg %d, state %u\n", | |
371 | info, msg->status, *state); | |
372 | } | |
373 | ||
374 | static inline void __cs_hsi_error_post(struct cs_hsi_iface *hi) | |
375 | { | |
376 | spin_unlock(&hi->lock); | |
377 | } | |
378 | ||
379 | static inline void __cs_hsi_error_read_bits(unsigned int *state) | |
380 | { | |
381 | *state |= SSI_CHANNEL_STATE_ERROR; | |
382 | *state &= ~(SSI_CHANNEL_STATE_READING | SSI_CHANNEL_STATE_POLL); | |
383 | } | |
384 | ||
385 | static inline void __cs_hsi_error_write_bits(unsigned int *state) | |
386 | { | |
387 | *state |= SSI_CHANNEL_STATE_ERROR; | |
388 | *state &= ~SSI_CHANNEL_STATE_WRITING; | |
389 | } | |
390 | ||
391 | static void cs_hsi_control_read_error(struct cs_hsi_iface *hi, | |
392 | struct hsi_msg *msg) | |
393 | { | |
394 | __cs_hsi_error_pre(hi, msg, "control read", &hi->control_state); | |
395 | cs_release_cmd(msg); | |
396 | __cs_hsi_error_read_bits(&hi->control_state); | |
397 | __cs_hsi_error_post(hi); | |
398 | } | |
399 | ||
400 | static void cs_hsi_control_write_error(struct cs_hsi_iface *hi, | |
401 | struct hsi_msg *msg) | |
402 | { | |
403 | __cs_hsi_error_pre(hi, msg, "control write", &hi->control_state); | |
404 | cs_release_cmd(msg); | |
405 | __cs_hsi_error_write_bits(&hi->control_state); | |
406 | __cs_hsi_error_post(hi); | |
407 | ||
408 | } | |
409 | ||
410 | static void cs_hsi_data_read_error(struct cs_hsi_iface *hi, struct hsi_msg *msg) | |
411 | { | |
412 | __cs_hsi_error_pre(hi, msg, "data read", &hi->data_state); | |
413 | __cs_hsi_error_read_bits(&hi->data_state); | |
414 | __cs_hsi_error_post(hi); | |
415 | } | |
416 | ||
417 | static void cs_hsi_data_write_error(struct cs_hsi_iface *hi, | |
418 | struct hsi_msg *msg) | |
419 | { | |
420 | __cs_hsi_error_pre(hi, msg, "data write", &hi->data_state); | |
421 | __cs_hsi_error_write_bits(&hi->data_state); | |
422 | __cs_hsi_error_post(hi); | |
423 | } | |
424 | ||
425 | static void cs_hsi_read_on_control_complete(struct hsi_msg *msg) | |
426 | { | |
427 | u32 cmd = cs_get_cmd(msg); | |
428 | struct cs_hsi_iface *hi = msg->context; | |
429 | ||
430 | spin_lock(&hi->lock); | |
431 | hi->control_state &= ~SSI_CHANNEL_STATE_READING; | |
432 | if (msg->status == HSI_STATUS_ERROR) { | |
433 | dev_err(&hi->cl->device, "Control RX error detected\n"); | |
7f62fe8a | 434 | spin_unlock(&hi->lock); |
3c13ab1d | 435 | cs_hsi_control_read_error(hi, msg); |
7f62fe8a KV |
436 | goto out; |
437 | } | |
438 | dev_dbg(&hi->cl->device, "Read on control: %08X\n", cmd); | |
439 | cs_release_cmd(msg); | |
440 | if (hi->flags & CS_FEAT_TSTAMP_RX_CTRL) { | |
b6dc80db | 441 | struct timespec64 tspec; |
5023a5ca | 442 | struct cs_timestamp *tstamp = |
7f62fe8a | 443 | &hi->mmap_cfg->tstamp_rx_ctrl; |
5023a5ca | 444 | |
b6dc80db | 445 | ktime_get_ts64(&tspec); |
5023a5ca SR |
446 | |
447 | tstamp->tv_sec = (__u32) tspec.tv_sec; | |
448 | tstamp->tv_nsec = (__u32) tspec.tv_nsec; | |
7f62fe8a KV |
449 | } |
450 | spin_unlock(&hi->lock); | |
451 | ||
452 | cs_notify_control(cmd); | |
453 | ||
454 | out: | |
455 | cs_hsi_read_on_control(hi); | |
456 | } | |
457 | ||
458 | static void cs_hsi_peek_on_control_complete(struct hsi_msg *msg) | |
459 | { | |
460 | struct cs_hsi_iface *hi = msg->context; | |
461 | int ret; | |
462 | ||
463 | if (msg->status == HSI_STATUS_ERROR) { | |
464 | dev_err(&hi->cl->device, "Control peek RX error detected\n"); | |
465 | cs_hsi_control_read_error(hi, msg); | |
466 | return; | |
467 | } | |
468 | ||
469 | WARN_ON(!(hi->control_state & SSI_CHANNEL_STATE_READING)); | |
470 | ||
471 | dev_dbg(&hi->cl->device, "Peek on control complete, reading\n"); | |
472 | msg->sgt.nents = 1; | |
473 | msg->complete = cs_hsi_read_on_control_complete; | |
474 | ret = hsi_async_read(hi->cl, msg); | |
475 | if (ret) | |
476 | cs_hsi_control_read_error(hi, msg); | |
477 | } | |
478 | ||
479 | static void cs_hsi_read_on_control(struct cs_hsi_iface *hi) | |
480 | { | |
481 | struct hsi_msg *msg; | |
482 | int ret; | |
483 | ||
484 | spin_lock(&hi->lock); | |
485 | if (hi->control_state & SSI_CHANNEL_STATE_READING) { | |
486 | dev_err(&hi->cl->device, "Control read already pending (%d)\n", | |
487 | hi->control_state); | |
488 | spin_unlock(&hi->lock); | |
489 | return; | |
490 | } | |
491 | if (hi->control_state & SSI_CHANNEL_STATE_ERROR) { | |
492 | dev_err(&hi->cl->device, "Control read error (%d)\n", | |
493 | hi->control_state); | |
494 | spin_unlock(&hi->lock); | |
495 | return; | |
496 | } | |
497 | hi->control_state |= SSI_CHANNEL_STATE_READING; | |
498 | dev_dbg(&hi->cl->device, "Issuing RX on control\n"); | |
499 | msg = cs_claim_cmd(hi); | |
500 | spin_unlock(&hi->lock); | |
501 | ||
502 | msg->sgt.nents = 0; | |
503 | msg->complete = cs_hsi_peek_on_control_complete; | |
504 | ret = hsi_async_read(hi->cl, msg); | |
505 | if (ret) | |
506 | cs_hsi_control_read_error(hi, msg); | |
507 | } | |
508 | ||
509 | static void cs_hsi_write_on_control_complete(struct hsi_msg *msg) | |
510 | { | |
511 | struct cs_hsi_iface *hi = msg->context; | |
512 | if (msg->status == HSI_STATUS_COMPLETED) { | |
513 | spin_lock(&hi->lock); | |
514 | hi->control_state &= ~SSI_CHANNEL_STATE_WRITING; | |
515 | cs_release_cmd(msg); | |
516 | spin_unlock(&hi->lock); | |
517 | } else if (msg->status == HSI_STATUS_ERROR) { | |
518 | cs_hsi_control_write_error(hi, msg); | |
519 | } else { | |
520 | dev_err(&hi->cl->device, | |
521 | "unexpected status in control write callback %d\n", | |
522 | msg->status); | |
523 | } | |
524 | } | |
525 | ||
526 | static int cs_hsi_write_on_control(struct cs_hsi_iface *hi, u32 message) | |
527 | { | |
528 | struct hsi_msg *msg; | |
529 | int ret; | |
530 | ||
531 | spin_lock(&hi->lock); | |
532 | if (hi->control_state & SSI_CHANNEL_STATE_ERROR) { | |
533 | spin_unlock(&hi->lock); | |
534 | return -EIO; | |
535 | } | |
536 | if (hi->control_state & SSI_CHANNEL_STATE_WRITING) { | |
537 | dev_err(&hi->cl->device, | |
538 | "Write still pending on control channel.\n"); | |
539 | spin_unlock(&hi->lock); | |
540 | return -EBUSY; | |
541 | } | |
542 | hi->control_state |= SSI_CHANNEL_STATE_WRITING; | |
543 | msg = cs_claim_cmd(hi); | |
544 | spin_unlock(&hi->lock); | |
545 | ||
546 | cs_set_cmd(msg, message); | |
547 | msg->sgt.nents = 1; | |
548 | msg->complete = cs_hsi_write_on_control_complete; | |
549 | dev_dbg(&hi->cl->device, | |
550 | "Sending control message %08X\n", message); | |
551 | ret = hsi_async_write(hi->cl, msg); | |
552 | if (ret) { | |
553 | dev_err(&hi->cl->device, | |
554 | "async_write failed with %d\n", ret); | |
555 | cs_hsi_control_write_error(hi, msg); | |
556 | } | |
557 | ||
558 | /* | |
559 | * Make sure control read is always pending when issuing | |
560 | * new control writes. This is needed as the controller | |
561 | * may flush our messages if e.g. the peer device reboots | |
562 | * unexpectedly (and we cannot directly resubmit a new read from | |
563 | * the message destructor; see cs_cmd_destructor()). | |
564 | */ | |
565 | if (!(hi->control_state & SSI_CHANNEL_STATE_READING)) { | |
566 | dev_err(&hi->cl->device, "Restarting control reads\n"); | |
567 | cs_hsi_read_on_control(hi); | |
568 | } | |
569 | ||
570 | return 0; | |
571 | } | |
572 | ||
573 | static void cs_hsi_read_on_data_complete(struct hsi_msg *msg) | |
574 | { | |
575 | struct cs_hsi_iface *hi = msg->context; | |
576 | u32 payload; | |
577 | ||
578 | if (unlikely(msg->status == HSI_STATUS_ERROR)) { | |
579 | cs_hsi_data_read_error(hi, msg); | |
580 | return; | |
581 | } | |
582 | ||
583 | spin_lock(&hi->lock); | |
584 | WARN_ON(!(hi->data_state & SSI_CHANNEL_STATE_READING)); | |
585 | hi->data_state &= ~SSI_CHANNEL_STATE_READING; | |
586 | payload = CS_RX_DATA_RECEIVED; | |
587 | payload |= hi->rx_slot; | |
588 | hi->rx_slot++; | |
589 | hi->rx_slot %= hi->rx_ptr_boundary; | |
590 | /* expose current rx ptr in mmap area */ | |
591 | hi->mmap_cfg->rx_ptr = hi->rx_slot; | |
592 | if (unlikely(waitqueue_active(&hi->datawait))) | |
593 | wake_up_interruptible(&hi->datawait); | |
594 | spin_unlock(&hi->lock); | |
595 | ||
596 | cs_notify_data(payload, hi->rx_bufs); | |
597 | cs_hsi_read_on_data(hi); | |
598 | } | |
599 | ||
600 | static void cs_hsi_peek_on_data_complete(struct hsi_msg *msg) | |
601 | { | |
602 | struct cs_hsi_iface *hi = msg->context; | |
603 | u32 *address; | |
604 | int ret; | |
605 | ||
606 | if (unlikely(msg->status == HSI_STATUS_ERROR)) { | |
607 | cs_hsi_data_read_error(hi, msg); | |
608 | return; | |
609 | } | |
610 | if (unlikely(hi->iface_state != CS_STATE_CONFIGURED)) { | |
611 | dev_err(&hi->cl->device, "Data received in invalid state\n"); | |
612 | cs_hsi_data_read_error(hi, msg); | |
613 | return; | |
614 | } | |
615 | ||
616 | spin_lock(&hi->lock); | |
617 | WARN_ON(!(hi->data_state & SSI_CHANNEL_STATE_POLL)); | |
618 | hi->data_state &= ~SSI_CHANNEL_STATE_POLL; | |
619 | hi->data_state |= SSI_CHANNEL_STATE_READING; | |
620 | spin_unlock(&hi->lock); | |
621 | ||
622 | address = (u32 *)(hi->mmap_base + | |
623 | hi->rx_offsets[hi->rx_slot % hi->rx_bufs]); | |
624 | sg_init_one(msg->sgt.sgl, address, hi->buf_size); | |
625 | msg->sgt.nents = 1; | |
626 | msg->complete = cs_hsi_read_on_data_complete; | |
627 | ret = hsi_async_read(hi->cl, msg); | |
628 | if (ret) | |
629 | cs_hsi_data_read_error(hi, msg); | |
630 | } | |
631 | ||
632 | /* | |
633 | * Read/write transaction is ongoing. Returns false if in | |
634 | * SSI_CHANNEL_STATE_POLL state. | |
635 | */ | |
636 | static inline int cs_state_xfer_active(unsigned int state) | |
637 | { | |
638 | return (state & SSI_CHANNEL_STATE_WRITING) || | |
639 | (state & SSI_CHANNEL_STATE_READING); | |
640 | } | |
641 | ||
642 | /* | |
643 | * No pending read/writes | |
644 | */ | |
645 | static inline int cs_state_idle(unsigned int state) | |
646 | { | |
647 | return !(state & ~SSI_CHANNEL_STATE_ERROR); | |
648 | } | |
649 | ||
650 | static void cs_hsi_read_on_data(struct cs_hsi_iface *hi) | |
651 | { | |
652 | struct hsi_msg *rxmsg; | |
653 | int ret; | |
654 | ||
655 | spin_lock(&hi->lock); | |
656 | if (hi->data_state & | |
657 | (SSI_CHANNEL_STATE_READING | SSI_CHANNEL_STATE_POLL)) { | |
658 | dev_dbg(&hi->cl->device, "Data read already pending (%u)\n", | |
659 | hi->data_state); | |
660 | spin_unlock(&hi->lock); | |
661 | return; | |
662 | } | |
663 | hi->data_state |= SSI_CHANNEL_STATE_POLL; | |
664 | spin_unlock(&hi->lock); | |
665 | ||
666 | rxmsg = hi->data_rx_msg; | |
667 | sg_init_one(rxmsg->sgt.sgl, (void *)hi->mmap_base, 0); | |
668 | rxmsg->sgt.nents = 0; | |
669 | rxmsg->complete = cs_hsi_peek_on_data_complete; | |
670 | ||
671 | ret = hsi_async_read(hi->cl, rxmsg); | |
672 | if (ret) | |
673 | cs_hsi_data_read_error(hi, rxmsg); | |
674 | } | |
675 | ||
676 | static void cs_hsi_write_on_data_complete(struct hsi_msg *msg) | |
677 | { | |
678 | struct cs_hsi_iface *hi = msg->context; | |
679 | ||
680 | if (msg->status == HSI_STATUS_COMPLETED) { | |
681 | spin_lock(&hi->lock); | |
682 | hi->data_state &= ~SSI_CHANNEL_STATE_WRITING; | |
683 | if (unlikely(waitqueue_active(&hi->datawait))) | |
684 | wake_up_interruptible(&hi->datawait); | |
685 | spin_unlock(&hi->lock); | |
686 | } else { | |
687 | cs_hsi_data_write_error(hi, msg); | |
688 | } | |
689 | } | |
690 | ||
691 | static int cs_hsi_write_on_data(struct cs_hsi_iface *hi, unsigned int slot) | |
692 | { | |
693 | u32 *address; | |
694 | struct hsi_msg *txmsg; | |
695 | int ret; | |
696 | ||
697 | spin_lock(&hi->lock); | |
698 | if (hi->iface_state != CS_STATE_CONFIGURED) { | |
699 | dev_err(&hi->cl->device, "Not configured, aborting\n"); | |
700 | ret = -EINVAL; | |
701 | goto error; | |
702 | } | |
703 | if (hi->data_state & SSI_CHANNEL_STATE_ERROR) { | |
704 | dev_err(&hi->cl->device, "HSI error, aborting\n"); | |
705 | ret = -EIO; | |
706 | goto error; | |
707 | } | |
708 | if (hi->data_state & SSI_CHANNEL_STATE_WRITING) { | |
709 | dev_err(&hi->cl->device, "Write pending on data channel.\n"); | |
710 | ret = -EBUSY; | |
711 | goto error; | |
712 | } | |
713 | hi->data_state |= SSI_CHANNEL_STATE_WRITING; | |
714 | spin_unlock(&hi->lock); | |
715 | ||
716 | hi->tx_slot = slot; | |
717 | address = (u32 *)(hi->mmap_base + hi->tx_offsets[hi->tx_slot]); | |
718 | txmsg = hi->data_tx_msg; | |
719 | sg_init_one(txmsg->sgt.sgl, address, hi->buf_size); | |
720 | txmsg->complete = cs_hsi_write_on_data_complete; | |
721 | ret = hsi_async_write(hi->cl, txmsg); | |
722 | if (ret) | |
723 | cs_hsi_data_write_error(hi, txmsg); | |
724 | ||
725 | return ret; | |
726 | ||
727 | error: | |
728 | spin_unlock(&hi->lock); | |
729 | if (ret == -EIO) | |
730 | cs_hsi_data_write_error(hi, hi->data_tx_msg); | |
731 | ||
732 | return ret; | |
733 | } | |
734 | ||
735 | static unsigned int cs_hsi_get_state(struct cs_hsi_iface *hi) | |
736 | { | |
737 | return hi->iface_state; | |
738 | } | |
739 | ||
740 | static int cs_hsi_command(struct cs_hsi_iface *hi, u32 cmd) | |
741 | { | |
742 | int ret = 0; | |
743 | ||
744 | local_bh_disable(); | |
745 | switch (cmd & TARGET_MASK) { | |
746 | case TARGET_REMOTE: | |
747 | ret = cs_hsi_write_on_control(hi, cmd); | |
748 | break; | |
749 | case TARGET_LOCAL: | |
750 | if ((cmd & CS_CMD_MASK) == CS_TX_DATA_READY) | |
751 | ret = cs_hsi_write_on_data(hi, cmd & CS_PARAM_MASK); | |
752 | else | |
753 | ret = -EINVAL; | |
754 | break; | |
755 | default: | |
756 | ret = -EINVAL; | |
757 | break; | |
758 | } | |
759 | local_bh_enable(); | |
760 | ||
761 | return ret; | |
762 | } | |
763 | ||
764 | static void cs_hsi_set_wakeline(struct cs_hsi_iface *hi, bool new_state) | |
765 | { | |
766 | int change = 0; | |
767 | ||
768 | spin_lock_bh(&hi->lock); | |
769 | if (hi->wakeline_state != new_state) { | |
770 | hi->wakeline_state = new_state; | |
771 | change = 1; | |
772 | dev_dbg(&hi->cl->device, "setting wake line to %d (%p)\n", | |
773 | new_state, hi->cl); | |
774 | } | |
775 | spin_unlock_bh(&hi->lock); | |
776 | ||
777 | if (change) { | |
778 | if (new_state) | |
779 | ssip_slave_start_tx(hi->master); | |
780 | else | |
781 | ssip_slave_stop_tx(hi->master); | |
782 | } | |
783 | ||
784 | dev_dbg(&hi->cl->device, "wake line set to %d (%p)\n", | |
785 | new_state, hi->cl); | |
786 | } | |
787 | ||
788 | static void set_buffer_sizes(struct cs_hsi_iface *hi, int rx_bufs, int tx_bufs) | |
789 | { | |
790 | hi->rx_bufs = rx_bufs; | |
791 | hi->tx_bufs = tx_bufs; | |
792 | hi->mmap_cfg->rx_bufs = rx_bufs; | |
793 | hi->mmap_cfg->tx_bufs = tx_bufs; | |
794 | ||
795 | if (hi->flags & CS_FEAT_ROLLING_RX_COUNTER) { | |
796 | /* | |
797 | * For more robust overrun detection, let the rx | |
798 | * pointer run in range 0..'boundary-1'. Boundary | |
799 | * is a multiple of rx_bufs, and limited in max size | |
800 | * by RX_PTR_MAX_SHIFT to allow for fast ptr-diff | |
801 | * calculation. | |
802 | */ | |
803 | hi->rx_ptr_boundary = (rx_bufs << RX_PTR_BOUNDARY_SHIFT); | |
804 | hi->mmap_cfg->rx_ptr_boundary = hi->rx_ptr_boundary; | |
805 | } else { | |
806 | hi->rx_ptr_boundary = hi->rx_bufs; | |
807 | } | |
808 | } | |
809 | ||
810 | static int check_buf_params(struct cs_hsi_iface *hi, | |
811 | const struct cs_buffer_config *buf_cfg) | |
812 | { | |
813 | size_t buf_size_aligned = L1_CACHE_ALIGN(buf_cfg->buf_size) * | |
814 | (buf_cfg->rx_bufs + buf_cfg->tx_bufs); | |
815 | size_t ctrl_size_aligned = L1_CACHE_ALIGN(sizeof(*hi->mmap_cfg)); | |
816 | int r = 0; | |
817 | ||
818 | if (buf_cfg->rx_bufs > CS_MAX_BUFFERS || | |
819 | buf_cfg->tx_bufs > CS_MAX_BUFFERS) { | |
820 | r = -EINVAL; | |
821 | } else if ((buf_size_aligned + ctrl_size_aligned) >= hi->mmap_size) { | |
822 | dev_err(&hi->cl->device, "No space for the requested buffer " | |
823 | "configuration\n"); | |
824 | r = -ENOBUFS; | |
825 | } | |
826 | ||
827 | return r; | |
828 | } | |
829 | ||
4ef69e17 | 830 | /* |
7f62fe8a KV |
831 | * Block until pending data transfers have completed. |
832 | */ | |
833 | static int cs_hsi_data_sync(struct cs_hsi_iface *hi) | |
834 | { | |
835 | int r = 0; | |
836 | ||
837 | spin_lock_bh(&hi->lock); | |
838 | ||
839 | if (!cs_state_xfer_active(hi->data_state)) { | |
840 | dev_dbg(&hi->cl->device, "hsi_data_sync break, idle\n"); | |
841 | goto out; | |
842 | } | |
843 | ||
844 | for (;;) { | |
845 | int s; | |
846 | DEFINE_WAIT(wait); | |
847 | if (!cs_state_xfer_active(hi->data_state)) | |
848 | goto out; | |
849 | if (signal_pending(current)) { | |
850 | r = -ERESTARTSYS; | |
851 | goto out; | |
852 | } | |
4ef69e17 | 853 | /* |
7f62fe8a KV |
854 | * prepare_to_wait must be called with hi->lock held |
855 | * so that callbacks can check for waitqueue_active() | |
856 | */ | |
857 | prepare_to_wait(&hi->datawait, &wait, TASK_INTERRUPTIBLE); | |
858 | spin_unlock_bh(&hi->lock); | |
859 | s = schedule_timeout( | |
860 | msecs_to_jiffies(CS_HSI_TRANSFER_TIMEOUT_MS)); | |
861 | spin_lock_bh(&hi->lock); | |
862 | finish_wait(&hi->datawait, &wait); | |
863 | if (!s) { | |
864 | dev_dbg(&hi->cl->device, | |
865 | "hsi_data_sync timeout after %d ms\n", | |
866 | CS_HSI_TRANSFER_TIMEOUT_MS); | |
867 | r = -EIO; | |
868 | goto out; | |
869 | } | |
870 | } | |
871 | ||
872 | out: | |
873 | spin_unlock_bh(&hi->lock); | |
874 | dev_dbg(&hi->cl->device, "hsi_data_sync done with res %d\n", r); | |
875 | ||
876 | return r; | |
877 | } | |
878 | ||
879 | static void cs_hsi_data_enable(struct cs_hsi_iface *hi, | |
880 | struct cs_buffer_config *buf_cfg) | |
881 | { | |
882 | unsigned int data_start, i; | |
883 | ||
884 | BUG_ON(hi->buf_size == 0); | |
885 | ||
886 | set_buffer_sizes(hi, buf_cfg->rx_bufs, buf_cfg->tx_bufs); | |
887 | ||
888 | hi->slot_size = L1_CACHE_ALIGN(hi->buf_size); | |
889 | dev_dbg(&hi->cl->device, | |
890 | "setting slot size to %u, buf size %u, align %u\n", | |
891 | hi->slot_size, hi->buf_size, L1_CACHE_BYTES); | |
892 | ||
893 | data_start = L1_CACHE_ALIGN(sizeof(*hi->mmap_cfg)); | |
894 | dev_dbg(&hi->cl->device, | |
895 | "setting data start at %u, cfg block %u, align %u\n", | |
896 | data_start, sizeof(*hi->mmap_cfg), L1_CACHE_BYTES); | |
897 | ||
898 | for (i = 0; i < hi->mmap_cfg->rx_bufs; i++) { | |
899 | hi->rx_offsets[i] = data_start + i * hi->slot_size; | |
900 | hi->mmap_cfg->rx_offsets[i] = hi->rx_offsets[i]; | |
901 | dev_dbg(&hi->cl->device, "DL buf #%u at %u\n", | |
902 | i, hi->rx_offsets[i]); | |
903 | } | |
904 | for (i = 0; i < hi->mmap_cfg->tx_bufs; i++) { | |
905 | hi->tx_offsets[i] = data_start + | |
906 | (i + hi->mmap_cfg->rx_bufs) * hi->slot_size; | |
907 | hi->mmap_cfg->tx_offsets[i] = hi->tx_offsets[i]; | |
908 | dev_dbg(&hi->cl->device, "UL buf #%u at %u\n", | |
909 | i, hi->rx_offsets[i]); | |
910 | } | |
911 | ||
912 | hi->iface_state = CS_STATE_CONFIGURED; | |
913 | } | |
914 | ||
915 | static void cs_hsi_data_disable(struct cs_hsi_iface *hi, int old_state) | |
916 | { | |
917 | if (old_state == CS_STATE_CONFIGURED) { | |
918 | dev_dbg(&hi->cl->device, | |
919 | "closing data channel with slot size 0\n"); | |
920 | hi->iface_state = CS_STATE_OPENED; | |
921 | } | |
922 | } | |
923 | ||
924 | static int cs_hsi_buf_config(struct cs_hsi_iface *hi, | |
925 | struct cs_buffer_config *buf_cfg) | |
926 | { | |
927 | int r = 0; | |
928 | unsigned int old_state = hi->iface_state; | |
929 | ||
930 | spin_lock_bh(&hi->lock); | |
931 | /* Prevent new transactions during buffer reconfig */ | |
932 | if (old_state == CS_STATE_CONFIGURED) | |
933 | hi->iface_state = CS_STATE_OPENED; | |
934 | spin_unlock_bh(&hi->lock); | |
935 | ||
936 | /* | |
937 | * make sure that no non-zero data reads are ongoing before | |
938 | * proceeding to change the buffer layout | |
939 | */ | |
940 | r = cs_hsi_data_sync(hi); | |
941 | if (r < 0) | |
942 | return r; | |
943 | ||
944 | WARN_ON(cs_state_xfer_active(hi->data_state)); | |
945 | ||
946 | spin_lock_bh(&hi->lock); | |
947 | r = check_buf_params(hi, buf_cfg); | |
948 | if (r < 0) | |
949 | goto error; | |
950 | ||
951 | hi->buf_size = buf_cfg->buf_size; | |
952 | hi->mmap_cfg->buf_size = hi->buf_size; | |
953 | hi->flags = buf_cfg->flags; | |
954 | ||
955 | hi->rx_slot = 0; | |
956 | hi->tx_slot = 0; | |
957 | hi->slot_size = 0; | |
958 | ||
959 | if (hi->buf_size) | |
960 | cs_hsi_data_enable(hi, buf_cfg); | |
961 | else | |
962 | cs_hsi_data_disable(hi, old_state); | |
963 | ||
964 | spin_unlock_bh(&hi->lock); | |
965 | ||
966 | if (old_state != hi->iface_state) { | |
967 | if (hi->iface_state == CS_STATE_CONFIGURED) { | |
6ca50a47 | 968 | cpu_latency_qos_add_request(&hi->pm_qos_req, |
7f62fe8a KV |
969 | CS_QOS_LATENCY_FOR_DATA_USEC); |
970 | local_bh_disable(); | |
971 | cs_hsi_read_on_data(hi); | |
972 | local_bh_enable(); | |
973 | } else if (old_state == CS_STATE_CONFIGURED) { | |
6ca50a47 | 974 | cpu_latency_qos_remove_request(&hi->pm_qos_req); |
7f62fe8a KV |
975 | } |
976 | } | |
977 | return r; | |
978 | ||
979 | error: | |
980 | spin_unlock_bh(&hi->lock); | |
981 | return r; | |
982 | } | |
983 | ||
984 | static int cs_hsi_start(struct cs_hsi_iface **hi, struct hsi_client *cl, | |
985 | unsigned long mmap_base, unsigned long mmap_size) | |
986 | { | |
987 | int err = 0; | |
988 | struct cs_hsi_iface *hsi_if = kzalloc(sizeof(*hsi_if), GFP_KERNEL); | |
989 | ||
990 | dev_dbg(&cl->device, "cs_hsi_start\n"); | |
991 | ||
992 | if (!hsi_if) { | |
993 | err = -ENOMEM; | |
994 | goto leave0; | |
995 | } | |
996 | spin_lock_init(&hsi_if->lock); | |
997 | hsi_if->cl = cl; | |
998 | hsi_if->iface_state = CS_STATE_CLOSED; | |
999 | hsi_if->mmap_cfg = (struct cs_mmap_config_block *)mmap_base; | |
1000 | hsi_if->mmap_base = mmap_base; | |
1001 | hsi_if->mmap_size = mmap_size; | |
1002 | memset(hsi_if->mmap_cfg, 0, sizeof(*hsi_if->mmap_cfg)); | |
1003 | init_waitqueue_head(&hsi_if->datawait); | |
1004 | err = cs_alloc_cmds(hsi_if); | |
1005 | if (err < 0) { | |
1006 | dev_err(&cl->device, "Unable to alloc HSI messages\n"); | |
1007 | goto leave1; | |
1008 | } | |
1009 | err = cs_hsi_alloc_data(hsi_if); | |
1010 | if (err < 0) { | |
1011 | dev_err(&cl->device, "Unable to alloc HSI messages for data\n"); | |
1012 | goto leave2; | |
1013 | } | |
1014 | err = hsi_claim_port(cl, 1); | |
1015 | if (err < 0) { | |
1016 | dev_err(&cl->device, | |
1017 | "Could not open, HSI port already claimed\n"); | |
1018 | goto leave3; | |
1019 | } | |
1020 | hsi_if->master = ssip_slave_get_master(cl); | |
1021 | if (IS_ERR(hsi_if->master)) { | |
265ef3ee | 1022 | err = PTR_ERR(hsi_if->master); |
7f62fe8a KV |
1023 | dev_err(&cl->device, "Could not get HSI master client\n"); |
1024 | goto leave4; | |
1025 | } | |
1026 | if (!ssip_slave_running(hsi_if->master)) { | |
1027 | err = -ENODEV; | |
1028 | dev_err(&cl->device, | |
1029 | "HSI port not initialized\n"); | |
1030 | goto leave4; | |
1031 | } | |
1032 | ||
1033 | hsi_if->iface_state = CS_STATE_OPENED; | |
1034 | local_bh_disable(); | |
1035 | cs_hsi_read_on_control(hsi_if); | |
1036 | local_bh_enable(); | |
1037 | ||
1038 | dev_dbg(&cl->device, "cs_hsi_start...done\n"); | |
1039 | ||
1040 | BUG_ON(!hi); | |
1041 | *hi = hsi_if; | |
1042 | ||
1043 | return 0; | |
1044 | ||
1045 | leave4: | |
1046 | hsi_release_port(cl); | |
1047 | leave3: | |
1048 | cs_hsi_free_data(hsi_if); | |
1049 | leave2: | |
1050 | cs_free_cmds(hsi_if); | |
1051 | leave1: | |
1052 | kfree(hsi_if); | |
1053 | leave0: | |
1054 | dev_dbg(&cl->device, "cs_hsi_start...done/error\n\n"); | |
1055 | ||
1056 | return err; | |
1057 | } | |
1058 | ||
1059 | static void cs_hsi_stop(struct cs_hsi_iface *hi) | |
1060 | { | |
1061 | dev_dbg(&hi->cl->device, "cs_hsi_stop\n"); | |
1062 | cs_hsi_set_wakeline(hi, 0); | |
1063 | ssip_slave_put_master(hi->master); | |
1064 | ||
1065 | /* hsi_release_port() needs to be called with CS_STATE_CLOSED */ | |
1066 | hi->iface_state = CS_STATE_CLOSED; | |
1067 | hsi_release_port(hi->cl); | |
1068 | ||
1069 | /* | |
1070 | * hsi_release_port() should flush out all the pending | |
1071 | * messages, so cs_state_idle() should be true for both | |
1072 | * control and data channels. | |
1073 | */ | |
1074 | WARN_ON(!cs_state_idle(hi->control_state)); | |
1075 | WARN_ON(!cs_state_idle(hi->data_state)); | |
1076 | ||
6ca50a47 RW |
1077 | if (cpu_latency_qos_request_active(&hi->pm_qos_req)) |
1078 | cpu_latency_qos_remove_request(&hi->pm_qos_req); | |
7f62fe8a KV |
1079 | |
1080 | spin_lock_bh(&hi->lock); | |
1081 | cs_hsi_free_data(hi); | |
1082 | cs_free_cmds(hi); | |
1083 | spin_unlock_bh(&hi->lock); | |
1084 | kfree(hi); | |
1085 | } | |
1086 | ||
70d52ba9 | 1087 | static vm_fault_t cs_char_vma_fault(struct vm_fault *vmf) |
7f62fe8a | 1088 | { |
11bac800 | 1089 | struct cs_char *csdata = vmf->vma->vm_private_data; |
7f62fe8a KV |
1090 | struct page *page; |
1091 | ||
0f1a3e5f | 1092 | page = virt_to_page((void *)csdata->mmap_base); |
7f62fe8a KV |
1093 | get_page(page); |
1094 | vmf->page = page; | |
1095 | ||
1096 | return 0; | |
1097 | } | |
1098 | ||
7cbea8dc | 1099 | static const struct vm_operations_struct cs_char_vm_ops = { |
7f62fe8a KV |
1100 | .fault = cs_char_vma_fault, |
1101 | }; | |
1102 | ||
1103 | static int cs_char_fasync(int fd, struct file *file, int on) | |
1104 | { | |
1105 | struct cs_char *csdata = file->private_data; | |
1106 | ||
1107 | if (fasync_helper(fd, file, on, &csdata->async_queue) < 0) | |
1108 | return -EIO; | |
1109 | ||
1110 | return 0; | |
1111 | } | |
1112 | ||
afc9a42b | 1113 | static __poll_t cs_char_poll(struct file *file, poll_table *wait) |
7f62fe8a KV |
1114 | { |
1115 | struct cs_char *csdata = file->private_data; | |
afc9a42b | 1116 | __poll_t ret = 0; |
7f62fe8a KV |
1117 | |
1118 | poll_wait(file, &cs_char_data.wait, wait); | |
1119 | spin_lock_bh(&csdata->lock); | |
1120 | if (!list_empty(&csdata->chardev_queue)) | |
a9a08845 | 1121 | ret = EPOLLIN | EPOLLRDNORM; |
7f62fe8a | 1122 | else if (!list_empty(&csdata->dataind_queue)) |
a9a08845 | 1123 | ret = EPOLLIN | EPOLLRDNORM; |
7f62fe8a KV |
1124 | spin_unlock_bh(&csdata->lock); |
1125 | ||
1126 | return ret; | |
1127 | } | |
1128 | ||
1129 | static ssize_t cs_char_read(struct file *file, char __user *buf, size_t count, | |
1130 | loff_t *unused) | |
1131 | { | |
1132 | struct cs_char *csdata = file->private_data; | |
1133 | u32 data; | |
1134 | ssize_t retval; | |
1135 | ||
1136 | if (count < sizeof(data)) | |
1137 | return -EINVAL; | |
1138 | ||
1139 | for (;;) { | |
1140 | DEFINE_WAIT(wait); | |
1141 | ||
1142 | spin_lock_bh(&csdata->lock); | |
1143 | if (!list_empty(&csdata->chardev_queue)) { | |
1144 | data = cs_pop_entry(&csdata->chardev_queue); | |
1145 | } else if (!list_empty(&csdata->dataind_queue)) { | |
1146 | data = cs_pop_entry(&csdata->dataind_queue); | |
1147 | csdata->dataind_pending--; | |
1148 | } else { | |
1149 | data = 0; | |
1150 | } | |
1151 | spin_unlock_bh(&csdata->lock); | |
1152 | ||
1153 | if (data) | |
1154 | break; | |
1155 | if (file->f_flags & O_NONBLOCK) { | |
1156 | retval = -EAGAIN; | |
1157 | goto out; | |
1158 | } else if (signal_pending(current)) { | |
1159 | retval = -ERESTARTSYS; | |
1160 | goto out; | |
1161 | } | |
1162 | prepare_to_wait_exclusive(&csdata->wait, &wait, | |
1163 | TASK_INTERRUPTIBLE); | |
1164 | schedule(); | |
1165 | finish_wait(&csdata->wait, &wait); | |
1166 | } | |
1167 | ||
1168 | retval = put_user(data, (u32 __user *)buf); | |
1169 | if (!retval) | |
1170 | retval = sizeof(data); | |
1171 | ||
1172 | out: | |
1173 | return retval; | |
1174 | } | |
1175 | ||
1176 | static ssize_t cs_char_write(struct file *file, const char __user *buf, | |
1177 | size_t count, loff_t *unused) | |
1178 | { | |
1179 | struct cs_char *csdata = file->private_data; | |
1180 | u32 data; | |
1181 | int err; | |
1182 | ssize_t retval; | |
1183 | ||
1184 | if (count < sizeof(data)) | |
1185 | return -EINVAL; | |
1186 | ||
1187 | if (get_user(data, (u32 __user *)buf)) | |
1188 | retval = -EFAULT; | |
1189 | else | |
1190 | retval = count; | |
1191 | ||
1192 | err = cs_hsi_command(csdata->hi, data); | |
1193 | if (err < 0) | |
1194 | retval = err; | |
1195 | ||
1196 | return retval; | |
1197 | } | |
1198 | ||
1199 | static long cs_char_ioctl(struct file *file, unsigned int cmd, | |
1200 | unsigned long arg) | |
1201 | { | |
1202 | struct cs_char *csdata = file->private_data; | |
1203 | int r = 0; | |
1204 | ||
1205 | switch (cmd) { | |
1206 | case CS_GET_STATE: { | |
1207 | unsigned int state; | |
1208 | ||
1209 | state = cs_hsi_get_state(csdata->hi); | |
1210 | if (copy_to_user((void __user *)arg, &state, sizeof(state))) | |
1211 | r = -EFAULT; | |
1212 | ||
1213 | break; | |
1214 | } | |
1215 | case CS_SET_WAKELINE: { | |
1216 | unsigned int state; | |
1217 | ||
1218 | if (copy_from_user(&state, (void __user *)arg, sizeof(state))) { | |
1219 | r = -EFAULT; | |
1220 | break; | |
1221 | } | |
1222 | ||
1223 | if (state > 1) { | |
1224 | r = -EINVAL; | |
1225 | break; | |
1226 | } | |
1227 | ||
1228 | cs_hsi_set_wakeline(csdata->hi, !!state); | |
1229 | ||
1230 | break; | |
1231 | } | |
1232 | case CS_GET_IF_VERSION: { | |
1233 | unsigned int ifver = CS_IF_VERSION; | |
1234 | ||
1235 | if (copy_to_user((void __user *)arg, &ifver, sizeof(ifver))) | |
1236 | r = -EFAULT; | |
1237 | ||
1238 | break; | |
1239 | } | |
1240 | case CS_CONFIG_BUFS: { | |
1241 | struct cs_buffer_config buf_cfg; | |
1242 | ||
1243 | if (copy_from_user(&buf_cfg, (void __user *)arg, | |
1244 | sizeof(buf_cfg))) | |
1245 | r = -EFAULT; | |
1246 | else | |
1247 | r = cs_hsi_buf_config(csdata->hi, &buf_cfg); | |
1248 | ||
1249 | break; | |
1250 | } | |
1251 | default: | |
1252 | r = -ENOTTY; | |
1253 | break; | |
1254 | } | |
1255 | ||
1256 | return r; | |
1257 | } | |
1258 | ||
1259 | static int cs_char_mmap(struct file *file, struct vm_area_struct *vma) | |
1260 | { | |
1261 | if (vma->vm_end < vma->vm_start) | |
1262 | return -EINVAL; | |
1263 | ||
f6004b7b | 1264 | if (vma_pages(vma) != 1) |
7f62fe8a KV |
1265 | return -EINVAL; |
1266 | ||
1c71222e | 1267 | vm_flags_set(vma, VM_IO | VM_DONTDUMP | VM_DONTEXPAND); |
7f62fe8a KV |
1268 | vma->vm_ops = &cs_char_vm_ops; |
1269 | vma->vm_private_data = file->private_data; | |
1270 | ||
1271 | return 0; | |
1272 | } | |
1273 | ||
1274 | static int cs_char_open(struct inode *unused, struct file *file) | |
1275 | { | |
1276 | int ret = 0; | |
1277 | unsigned long p; | |
1278 | ||
1279 | spin_lock_bh(&cs_char_data.lock); | |
1280 | if (cs_char_data.opened) { | |
1281 | ret = -EBUSY; | |
1282 | spin_unlock_bh(&cs_char_data.lock); | |
1283 | goto out1; | |
1284 | } | |
1285 | cs_char_data.opened = 1; | |
1286 | cs_char_data.dataind_pending = 0; | |
1287 | spin_unlock_bh(&cs_char_data.lock); | |
1288 | ||
1289 | p = get_zeroed_page(GFP_KERNEL); | |
1290 | if (!p) { | |
1291 | ret = -ENOMEM; | |
1292 | goto out2; | |
1293 | } | |
1294 | ||
1295 | ret = cs_hsi_start(&cs_char_data.hi, cs_char_data.cl, p, CS_MMAP_SIZE); | |
1296 | if (ret) { | |
1297 | dev_err(&cs_char_data.cl->device, "Unable to initialize HSI\n"); | |
1298 | goto out3; | |
1299 | } | |
1300 | ||
1301 | /* these are only used in release so lock not needed */ | |
1302 | cs_char_data.mmap_base = p; | |
1303 | cs_char_data.mmap_size = CS_MMAP_SIZE; | |
1304 | ||
1305 | file->private_data = &cs_char_data; | |
1306 | ||
1307 | return 0; | |
1308 | ||
1309 | out3: | |
1310 | free_page(p); | |
1311 | out2: | |
1312 | spin_lock_bh(&cs_char_data.lock); | |
1313 | cs_char_data.opened = 0; | |
1314 | spin_unlock_bh(&cs_char_data.lock); | |
1315 | out1: | |
1316 | return ret; | |
1317 | } | |
1318 | ||
1319 | static void cs_free_char_queue(struct list_head *head) | |
1320 | { | |
1321 | struct char_queue *entry; | |
1322 | struct list_head *cursor, *next; | |
1323 | ||
1324 | if (!list_empty(head)) { | |
1325 | list_for_each_safe(cursor, next, head) { | |
1326 | entry = list_entry(cursor, struct char_queue, list); | |
1327 | list_del(&entry->list); | |
1328 | kfree(entry); | |
1329 | } | |
1330 | } | |
1331 | ||
1332 | } | |
1333 | ||
1334 | static int cs_char_release(struct inode *unused, struct file *file) | |
1335 | { | |
1336 | struct cs_char *csdata = file->private_data; | |
1337 | ||
1338 | cs_hsi_stop(csdata->hi); | |
1339 | spin_lock_bh(&csdata->lock); | |
1340 | csdata->hi = NULL; | |
1341 | free_page(csdata->mmap_base); | |
1342 | cs_free_char_queue(&csdata->chardev_queue); | |
1343 | cs_free_char_queue(&csdata->dataind_queue); | |
1344 | csdata->opened = 0; | |
1345 | spin_unlock_bh(&csdata->lock); | |
1346 | ||
1347 | return 0; | |
1348 | } | |
1349 | ||
1350 | static const struct file_operations cs_char_fops = { | |
1351 | .owner = THIS_MODULE, | |
1352 | .read = cs_char_read, | |
1353 | .write = cs_char_write, | |
1354 | .poll = cs_char_poll, | |
1355 | .unlocked_ioctl = cs_char_ioctl, | |
1356 | .mmap = cs_char_mmap, | |
1357 | .open = cs_char_open, | |
1358 | .release = cs_char_release, | |
1359 | .fasync = cs_char_fasync, | |
1360 | }; | |
1361 | ||
1362 | static struct miscdevice cs_char_miscdev = { | |
1363 | .minor = MISC_DYNAMIC_MINOR, | |
1364 | .name = "cmt_speech", | |
1365 | .fops = &cs_char_fops | |
1366 | }; | |
1367 | ||
1368 | static int cs_hsi_client_probe(struct device *dev) | |
1369 | { | |
1370 | int err = 0; | |
1371 | struct hsi_client *cl = to_hsi_client(dev); | |
1372 | ||
1373 | dev_dbg(dev, "hsi_client_probe\n"); | |
1374 | init_waitqueue_head(&cs_char_data.wait); | |
1375 | spin_lock_init(&cs_char_data.lock); | |
1376 | cs_char_data.opened = 0; | |
1377 | cs_char_data.cl = cl; | |
1378 | cs_char_data.hi = NULL; | |
1379 | INIT_LIST_HEAD(&cs_char_data.chardev_queue); | |
1380 | INIT_LIST_HEAD(&cs_char_data.dataind_queue); | |
1381 | ||
1382 | cs_char_data.channel_id_cmd = hsi_get_channel_id_by_name(cl, | |
1383 | "speech-control"); | |
1384 | if (cs_char_data.channel_id_cmd < 0) { | |
1385 | err = cs_char_data.channel_id_cmd; | |
1386 | dev_err(dev, "Could not get cmd channel (%d)\n", err); | |
1387 | return err; | |
1388 | } | |
1389 | ||
1390 | cs_char_data.channel_id_data = hsi_get_channel_id_by_name(cl, | |
1391 | "speech-data"); | |
1392 | if (cs_char_data.channel_id_data < 0) { | |
1393 | err = cs_char_data.channel_id_data; | |
1394 | dev_err(dev, "Could not get data channel (%d)\n", err); | |
1395 | return err; | |
1396 | } | |
1397 | ||
1398 | err = misc_register(&cs_char_miscdev); | |
1399 | if (err) | |
1400 | dev_err(dev, "Failed to register: %d\n", err); | |
1401 | ||
1402 | return err; | |
1403 | } | |
1404 | ||
1405 | static int cs_hsi_client_remove(struct device *dev) | |
1406 | { | |
1407 | struct cs_hsi_iface *hi; | |
1408 | ||
1409 | dev_dbg(dev, "hsi_client_remove\n"); | |
1410 | misc_deregister(&cs_char_miscdev); | |
1411 | spin_lock_bh(&cs_char_data.lock); | |
1412 | hi = cs_char_data.hi; | |
1413 | cs_char_data.hi = NULL; | |
1414 | spin_unlock_bh(&cs_char_data.lock); | |
1415 | if (hi) | |
1416 | cs_hsi_stop(hi); | |
1417 | ||
1418 | return 0; | |
1419 | } | |
1420 | ||
1421 | static struct hsi_client_driver cs_hsi_driver = { | |
1422 | .driver = { | |
1423 | .name = "cmt-speech", | |
1424 | .owner = THIS_MODULE, | |
1425 | .probe = cs_hsi_client_probe, | |
1426 | .remove = cs_hsi_client_remove, | |
1427 | }, | |
1428 | }; | |
1429 | ||
1430 | static int __init cs_char_init(void) | |
1431 | { | |
1432 | pr_info("CMT speech driver added\n"); | |
1433 | return hsi_register_client_driver(&cs_hsi_driver); | |
1434 | } | |
1435 | module_init(cs_char_init); | |
1436 | ||
1437 | static void __exit cs_char_exit(void) | |
1438 | { | |
1439 | hsi_unregister_client_driver(&cs_hsi_driver); | |
1440 | pr_info("CMT speech driver removed\n"); | |
1441 | } | |
1442 | module_exit(cs_char_exit); | |
1443 | ||
1444 | MODULE_ALIAS("hsi:cmt-speech"); | |
1445 | MODULE_AUTHOR("Kai Vehmanen <kai.vehmanen@nokia.com>"); | |
1446 | MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@nokia.com>"); | |
1447 | MODULE_DESCRIPTION("CMT speech driver"); | |
1448 | MODULE_LICENSE("GPL v2"); |