1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2022-2025 Qualcomm Innovation Center, Inc. All rights reserved.
4 */
5
6 #include <linux/auxiliary_bus.h>
7 #include <linux/ctype.h>
8 #include <linux/dma-mapping.h>
9 #include <linux/dma-map-ops.h>
10 #include <linux/init.h>
11 #include <linux/iommu.h>
12 #include <linux/module.h>
13 #include <linux/moduleparam.h>
14 #include <linux/soc/qcom/qmi.h>
15 #include <linux/usb.h>
16 #include <linux/usb/audio.h>
17 #include <linux/usb/audio-v2.h>
18 #include <linux/usb/audio-v3.h>
19 #include <linux/usb/hcd.h>
20 #include <linux/usb/quirks.h>
21 #include <linux/usb/xhci-sideband.h>
22
23 #include <sound/control.h>
24 #include <sound/core.h>
25 #include <sound/info.h>
26 #include <sound/initval.h>
27 #include <sound/pcm.h>
28 #include <sound/pcm_params.h>
29 #include <sound/q6usboffload.h>
30 #include <sound/soc.h>
31 #include <sound/soc-usb.h>
32
33 #include "../usbaudio.h"
34 #include "../card.h"
35 #include "../endpoint.h"
36 #include "../format.h"
37 #include "../helper.h"
38 #include "../pcm.h"
39 #include "../power.h"
40
41 #include "mixer_usb_offload.h"
42 #include "usb_audio_qmi_v01.h"
43
44 /* Stream disable request timeout during USB device disconnect */
45 #define DEV_RELEASE_WAIT_TIMEOUT 10000 /* in ms */
46
47 /* Data interval calculation parameters */
48 #define BUS_INTERVAL_FULL_SPEED 1000 /* in us */
49 #define BUS_INTERVAL_HIGHSPEED_AND_ABOVE 125 /* in us */
50 #define MAX_BINTERVAL_ISOC_EP 16
51
52 #define QMI_STREAM_REQ_CARD_NUM_MASK 0xffff0000
53 #define QMI_STREAM_REQ_DEV_NUM_MASK 0xff00
54 #define QMI_STREAM_REQ_DIRECTION 0xff
55
56 /* iommu resource parameters and management */
57 #define PREPEND_SID_TO_IOVA(iova, sid) ((u64)(((u64)(iova)) | \
58 (((u64)sid) << 32)))
59 #define IOVA_MASK(iova) (((u64)(iova)) & 0xFFFFFFFF)
60 #define IOVA_BASE 0x1000
61 #define IOVA_XFER_RING_BASE (IOVA_BASE + PAGE_SIZE * (SNDRV_CARDS + 1))
62 #define IOVA_XFER_BUF_BASE (IOVA_XFER_RING_BASE + PAGE_SIZE * SNDRV_CARDS * 32)
63 #define IOVA_XFER_RING_MAX (IOVA_XFER_BUF_BASE - PAGE_SIZE)
64 #define IOVA_XFER_BUF_MAX (0xfffff000 - PAGE_SIZE)
65
66 #define MAX_XFER_BUFF_LEN (24 * PAGE_SIZE)
67
68 struct iova_info {
69 struct list_head list;
70 unsigned long start_iova;
71 size_t size;
72 bool in_use;
73 };
74
75 struct intf_info {
76 /* IOMMU ring/buffer mapping information */
77 unsigned long data_xfer_ring_va;
78 size_t data_xfer_ring_size;
79 unsigned long sync_xfer_ring_va;
80 size_t sync_xfer_ring_size;
81 dma_addr_t xfer_buf_iova;
82 size_t xfer_buf_size;
83 dma_addr_t xfer_buf_dma;
84 u8 *xfer_buf_cpu;
85
86 /* USB endpoint information */
87 unsigned int data_ep_pipe;
88 unsigned int sync_ep_pipe;
89 unsigned int data_ep_idx;
90 unsigned int sync_ep_idx;
91
92 u8 intf_num;
93 u8 pcm_card_num;
94 u8 pcm_dev_num;
95 u8 direction;
96 bool in_use;
97 };
98
99 struct uaudio_qmi_dev {
100 struct device *dev;
101 struct q6usb_offload *data;
102 struct auxiliary_device *auxdev;
103
104 /* list to keep track of available iova */
105 struct list_head xfer_ring_list;
106 size_t xfer_ring_iova_size;
107 unsigned long curr_xfer_ring_iova;
108 struct list_head xfer_buf_list;
109 size_t xfer_buf_iova_size;
110 unsigned long curr_xfer_buf_iova;
111
112 /* bit fields representing pcm card enabled */
113 unsigned long card_slot;
114 /* indicate event ring mapped or not */
115 bool er_mapped;
116 };
117
118 struct uaudio_dev {
119 struct usb_device *udev;
120 /* audio control interface */
121 struct usb_host_interface *ctrl_intf;
122 unsigned int usb_core_id;
123 atomic_t in_use;
124 struct kref kref;
125 wait_queue_head_t disconnect_wq;
126
127 /* interface specific */
128 int num_intf;
129 struct intf_info *info;
130 struct snd_usb_audio *chip;
131
132 /* xhci sideband */
133 struct xhci_sideband *sb;
134
135 /* SoC USB device */
136 struct snd_soc_usb_device *sdev;
137 };
138
139 static struct uaudio_dev uadev[SNDRV_CARDS];
140 static struct uaudio_qmi_dev *uaudio_qdev;
141 static struct uaudio_qmi_svc *uaudio_svc;
142 static DEFINE_MUTEX(qdev_mutex);
143
144 struct uaudio_qmi_svc {
145 struct qmi_handle *uaudio_svc_hdl;
146 struct sockaddr_qrtr client_sq;
147 bool client_connected;
148 };
149
150 enum mem_type {
151 MEM_EVENT_RING,
152 MEM_XFER_RING,
153 MEM_XFER_BUF,
154 };
155
156 /* Supported audio formats */
157 enum usb_qmi_audio_format {
158 USB_QMI_PCM_FORMAT_S8 = 0,
159 USB_QMI_PCM_FORMAT_U8,
160 USB_QMI_PCM_FORMAT_S16_LE,
161 USB_QMI_PCM_FORMAT_S16_BE,
162 USB_QMI_PCM_FORMAT_U16_LE,
163 USB_QMI_PCM_FORMAT_U16_BE,
164 USB_QMI_PCM_FORMAT_S24_LE,
165 USB_QMI_PCM_FORMAT_S24_BE,
166 USB_QMI_PCM_FORMAT_U24_LE,
167 USB_QMI_PCM_FORMAT_U24_BE,
168 USB_QMI_PCM_FORMAT_S24_3LE,
169 USB_QMI_PCM_FORMAT_S24_3BE,
170 USB_QMI_PCM_FORMAT_U24_3LE,
171 USB_QMI_PCM_FORMAT_U24_3BE,
172 USB_QMI_PCM_FORMAT_S32_LE,
173 USB_QMI_PCM_FORMAT_S32_BE,
174 USB_QMI_PCM_FORMAT_U32_LE,
175 USB_QMI_PCM_FORMAT_U32_BE,
176 };
177
usb_qmi_get_pcm_num(struct snd_usb_audio * chip,int direction)178 static int usb_qmi_get_pcm_num(struct snd_usb_audio *chip, int direction)
179 {
180 struct snd_usb_substream *subs = NULL;
181 struct snd_usb_stream *as;
182 int count = 0;
183
184 list_for_each_entry(as, &chip->pcm_list, list) {
185 subs = &as->substream[direction];
186 if (subs->ep_num)
187 count++;
188 }
189
190 return count;
191 }
192
193 static enum usb_qmi_audio_device_speed_enum_v01
get_speed_info(enum usb_device_speed udev_speed)194 get_speed_info(enum usb_device_speed udev_speed)
195 {
196 switch (udev_speed) {
197 case USB_SPEED_LOW:
198 return USB_QMI_DEVICE_SPEED_LOW_V01;
199 case USB_SPEED_FULL:
200 return USB_QMI_DEVICE_SPEED_FULL_V01;
201 case USB_SPEED_HIGH:
202 return USB_QMI_DEVICE_SPEED_HIGH_V01;
203 case USB_SPEED_SUPER:
204 return USB_QMI_DEVICE_SPEED_SUPER_V01;
205 case USB_SPEED_SUPER_PLUS:
206 return USB_QMI_DEVICE_SPEED_SUPER_PLUS_V01;
207 default:
208 return USB_QMI_DEVICE_SPEED_INVALID_V01;
209 }
210 }
211
find_substream(unsigned int card_num,unsigned int pcm_idx,unsigned int direction)212 static struct snd_usb_substream *find_substream(unsigned int card_num,
213 unsigned int pcm_idx,
214 unsigned int direction)
215 {
216 struct snd_usb_substream *subs = NULL;
217 struct snd_usb_audio *chip;
218 struct snd_usb_stream *as;
219
220 chip = uadev[card_num].chip;
221 if (!chip || atomic_read(&chip->shutdown))
222 goto done;
223
224 if (pcm_idx >= chip->pcm_devs)
225 goto done;
226
227 if (direction > SNDRV_PCM_STREAM_CAPTURE)
228 goto done;
229
230 list_for_each_entry(as, &chip->pcm_list, list) {
231 if (as->pcm_index == pcm_idx) {
232 subs = &as->substream[direction];
233 goto done;
234 }
235 }
236
237 done:
238 return subs;
239 }
240
info_idx_from_ifnum(int card_num,int intf_num,bool enable)241 static int info_idx_from_ifnum(int card_num, int intf_num, bool enable)
242 {
243 int i;
244
245 /*
246 * default index 0 is used when info is allocated upon
247 * first enable audio stream req for a pcm device
248 */
249 if (enable && !uadev[card_num].info)
250 return 0;
251
252 for (i = 0; i < uadev[card_num].num_intf; i++) {
253 if (enable && !uadev[card_num].info[i].in_use)
254 return i;
255 else if (!enable &&
256 uadev[card_num].info[i].intf_num == intf_num)
257 return i;
258 }
259
260 return -EINVAL;
261 }
262
get_data_interval_from_si(struct snd_usb_substream * subs,u32 service_interval)263 static int get_data_interval_from_si(struct snd_usb_substream *subs,
264 u32 service_interval)
265 {
266 unsigned int bus_intval_mult;
267 unsigned int bus_intval;
268 unsigned int binterval;
269
270 if (subs->dev->speed >= USB_SPEED_HIGH)
271 bus_intval = BUS_INTERVAL_HIGHSPEED_AND_ABOVE;
272 else
273 bus_intval = BUS_INTERVAL_FULL_SPEED;
274
275 if (service_interval % bus_intval)
276 return -EINVAL;
277
278 bus_intval_mult = service_interval / bus_intval;
279 binterval = ffs(bus_intval_mult);
280 if (!binterval || binterval > MAX_BINTERVAL_ISOC_EP)
281 return -EINVAL;
282
283 /* check if another bit is set then bail out */
284 bus_intval_mult = bus_intval_mult >> binterval;
285 if (bus_intval_mult)
286 return -EINVAL;
287
288 return (binterval - 1);
289 }
290
291 /* maps audio format received over QMI to asound.h based pcm format */
map_pcm_format(enum usb_qmi_audio_format fmt_received)292 static snd_pcm_format_t map_pcm_format(enum usb_qmi_audio_format fmt_received)
293 {
294 switch (fmt_received) {
295 case USB_QMI_PCM_FORMAT_S8:
296 return SNDRV_PCM_FORMAT_S8;
297 case USB_QMI_PCM_FORMAT_U8:
298 return SNDRV_PCM_FORMAT_U8;
299 case USB_QMI_PCM_FORMAT_S16_LE:
300 return SNDRV_PCM_FORMAT_S16_LE;
301 case USB_QMI_PCM_FORMAT_S16_BE:
302 return SNDRV_PCM_FORMAT_S16_BE;
303 case USB_QMI_PCM_FORMAT_U16_LE:
304 return SNDRV_PCM_FORMAT_U16_LE;
305 case USB_QMI_PCM_FORMAT_U16_BE:
306 return SNDRV_PCM_FORMAT_U16_BE;
307 case USB_QMI_PCM_FORMAT_S24_LE:
308 return SNDRV_PCM_FORMAT_S24_LE;
309 case USB_QMI_PCM_FORMAT_S24_BE:
310 return SNDRV_PCM_FORMAT_S24_BE;
311 case USB_QMI_PCM_FORMAT_U24_LE:
312 return SNDRV_PCM_FORMAT_U24_LE;
313 case USB_QMI_PCM_FORMAT_U24_BE:
314 return SNDRV_PCM_FORMAT_U24_BE;
315 case USB_QMI_PCM_FORMAT_S24_3LE:
316 return SNDRV_PCM_FORMAT_S24_3LE;
317 case USB_QMI_PCM_FORMAT_S24_3BE:
318 return SNDRV_PCM_FORMAT_S24_3BE;
319 case USB_QMI_PCM_FORMAT_U24_3LE:
320 return SNDRV_PCM_FORMAT_U24_3LE;
321 case USB_QMI_PCM_FORMAT_U24_3BE:
322 return SNDRV_PCM_FORMAT_U24_3BE;
323 case USB_QMI_PCM_FORMAT_S32_LE:
324 return SNDRV_PCM_FORMAT_S32_LE;
325 case USB_QMI_PCM_FORMAT_S32_BE:
326 return SNDRV_PCM_FORMAT_S32_BE;
327 case USB_QMI_PCM_FORMAT_U32_LE:
328 return SNDRV_PCM_FORMAT_U32_LE;
329 case USB_QMI_PCM_FORMAT_U32_BE:
330 return SNDRV_PCM_FORMAT_U32_BE;
331 default:
332 /*
333 * We expect the caller to do input validation so we should
334 * never hit this. But we do have to return a proper
335 * snd_pcm_format_t value due to the __bitwise attribute; so
336 * just return the equivalent of 0 in case of bad input.
337 */
338 return SNDRV_PCM_FORMAT_S8;
339 }
340 }
341
342 /*
343 * Sends QMI disconnect indication message, assumes chip->mutex and qdev_mutex
344 * lock held by caller.
345 */
uaudio_send_disconnect_ind(struct snd_usb_audio * chip)346 static int uaudio_send_disconnect_ind(struct snd_usb_audio *chip)
347 {
348 struct qmi_uaudio_stream_ind_msg_v01 disconnect_ind = {0};
349 struct uaudio_qmi_svc *svc = uaudio_svc;
350 struct uaudio_dev *dev;
351 int ret = 0;
352
353 dev = &uadev[chip->card->number];
354
355 if (atomic_read(&dev->in_use)) {
356 mutex_unlock(&chip->mutex);
357 mutex_unlock(&qdev_mutex);
358 dev_dbg(uaudio_qdev->data->dev, "sending qmi indication suspend\n");
359 disconnect_ind.dev_event = USB_QMI_DEV_DISCONNECT_V01;
360 disconnect_ind.slot_id = dev->udev->slot_id;
361 disconnect_ind.controller_num = dev->usb_core_id;
362 disconnect_ind.controller_num_valid = 1;
363 ret = qmi_send_indication(svc->uaudio_svc_hdl, &svc->client_sq,
364 QMI_UAUDIO_STREAM_IND_V01,
365 QMI_UAUDIO_STREAM_IND_MSG_V01_MAX_MSG_LEN,
366 qmi_uaudio_stream_ind_msg_v01_ei,
367 &disconnect_ind);
368 if (ret < 0)
369 dev_err(uaudio_qdev->data->dev,
370 "qmi send failed with err: %d\n", ret);
371
372 ret = wait_event_interruptible_timeout(dev->disconnect_wq,
373 !atomic_read(&dev->in_use),
374 msecs_to_jiffies(DEV_RELEASE_WAIT_TIMEOUT));
375 if (!ret) {
376 dev_err(uaudio_qdev->data->dev,
377 "timeout while waiting for dev_release\n");
378 atomic_set(&dev->in_use, 0);
379 } else if (ret < 0) {
380 dev_err(uaudio_qdev->data->dev,
381 "failed with ret %d\n", ret);
382 atomic_set(&dev->in_use, 0);
383 }
384 mutex_lock(&qdev_mutex);
385 mutex_lock(&chip->mutex);
386 }
387
388 return ret;
389 }
390
391 /* Offloading IOMMU management */
uaudio_get_iova(unsigned long * curr_iova,size_t * curr_iova_size,struct list_head * head,size_t size)392 static unsigned long uaudio_get_iova(unsigned long *curr_iova,
393 size_t *curr_iova_size,
394 struct list_head *head, size_t size)
395 {
396 struct iova_info *info, *new_info = NULL;
397 struct list_head *curr_head;
398 size_t tmp_size = size;
399 unsigned long iova = 0;
400
401 if (size % PAGE_SIZE)
402 goto done;
403
404 if (size > *curr_iova_size)
405 goto done;
406
407 if (*curr_iova_size == 0)
408 goto done;
409
410 list_for_each_entry(info, head, list) {
411 /* exact size iova_info */
412 if (!info->in_use && info->size == size) {
413 info->in_use = true;
414 iova = info->start_iova;
415 *curr_iova_size -= size;
416 goto done;
417 } else if (!info->in_use && tmp_size >= info->size) {
418 if (!new_info)
419 new_info = info;
420 tmp_size -= info->size;
421 if (tmp_size)
422 continue;
423
424 iova = new_info->start_iova;
425 for (curr_head = &new_info->list; curr_head !=
426 &info->list; curr_head = curr_head->next) {
427 new_info = list_entry(curr_head, struct
428 iova_info, list);
429 new_info->in_use = true;
430 }
431 info->in_use = true;
432 *curr_iova_size -= size;
433 goto done;
434 } else {
435 /* iova region in use */
436 new_info = NULL;
437 tmp_size = size;
438 }
439 }
440
441 info = kzalloc(sizeof(*info), GFP_KERNEL);
442 if (!info) {
443 iova = 0;
444 goto done;
445 }
446
447 iova = *curr_iova;
448 info->start_iova = *curr_iova;
449 info->size = size;
450 info->in_use = true;
451 *curr_iova += size;
452 *curr_iova_size -= size;
453 list_add_tail(&info->list, head);
454
455 done:
456 return iova;
457 }
458
uaudio_put_iova(unsigned long iova,size_t size,struct list_head * head,size_t * curr_iova_size)459 static void uaudio_put_iova(unsigned long iova, size_t size, struct list_head
460 *head, size_t *curr_iova_size)
461 {
462 struct iova_info *info;
463 size_t tmp_size = size;
464 bool found = false;
465
466 list_for_each_entry(info, head, list) {
467 if (info->start_iova == iova) {
468 if (!info->in_use)
469 return;
470
471 found = true;
472 info->in_use = false;
473 if (info->size == size)
474 goto done;
475 }
476
477 if (found && tmp_size >= info->size) {
478 info->in_use = false;
479 tmp_size -= info->size;
480 if (!tmp_size)
481 goto done;
482 }
483 }
484
485 if (!found)
486 return;
487
488 done:
489 *curr_iova_size += size;
490 }
491
492 /**
493 * uaudio_iommu_unmap() - unmaps iommu memory for adsp
494 * @mtype: ring type
495 * @iova: virtual address to unmap
496 * @iova_size: region size
497 * @mapped_iova_size: mapped region size
498 *
499 * Unmaps the memory region that was previously assigned to the adsp.
500 *
501 */
uaudio_iommu_unmap(enum mem_type mtype,unsigned long iova,size_t iova_size,size_t mapped_iova_size)502 static void uaudio_iommu_unmap(enum mem_type mtype, unsigned long iova,
503 size_t iova_size, size_t mapped_iova_size)
504 {
505 size_t umap_size;
506 bool unmap = true;
507
508 if (!iova || !iova_size)
509 return;
510
511 switch (mtype) {
512 case MEM_EVENT_RING:
513 if (uaudio_qdev->er_mapped)
514 uaudio_qdev->er_mapped = false;
515 else
516 unmap = false;
517 break;
518
519 case MEM_XFER_RING:
520 uaudio_put_iova(iova, iova_size, &uaudio_qdev->xfer_ring_list,
521 &uaudio_qdev->xfer_ring_iova_size);
522 break;
523 case MEM_XFER_BUF:
524 uaudio_put_iova(iova, iova_size, &uaudio_qdev->xfer_buf_list,
525 &uaudio_qdev->xfer_buf_iova_size);
526 break;
527 default:
528 unmap = false;
529 }
530
531 if (!unmap || !mapped_iova_size)
532 return;
533
534 umap_size = iommu_unmap(uaudio_qdev->data->domain, iova, mapped_iova_size);
535 if (umap_size != mapped_iova_size)
536 dev_err(uaudio_qdev->data->dev,
537 "unmapped size %zu for iova 0x%08lx of mapped size %zu\n",
538 umap_size, iova, mapped_iova_size);
539 }
540
uaudio_iommu_map_prot(bool dma_coherent)541 static int uaudio_iommu_map_prot(bool dma_coherent)
542 {
543 int prot = IOMMU_READ | IOMMU_WRITE;
544
545 if (dma_coherent)
546 prot |= IOMMU_CACHE;
547 return prot;
548 }
549
550 /**
551 * uaudio_iommu_map_pa() - maps iommu memory for adsp
552 * @mtype: ring type
553 * @dma_coherent: dma coherent
554 * @pa: physical address for ring/buffer
555 * @size: size of memory region
556 *
557 * Maps the XHCI related resources to a memory region that is assigned to be
558 * used by the adsp. This will be mapped to the domain, which is created by
559 * the ASoC USB backend driver.
560 *
561 */
uaudio_iommu_map_pa(enum mem_type mtype,bool dma_coherent,phys_addr_t pa,size_t size)562 static unsigned long uaudio_iommu_map_pa(enum mem_type mtype, bool dma_coherent,
563 phys_addr_t pa, size_t size)
564 {
565 unsigned long iova = 0;
566 bool map = true;
567 int prot = uaudio_iommu_map_prot(dma_coherent);
568
569 switch (mtype) {
570 case MEM_EVENT_RING:
571 iova = IOVA_BASE;
572 /* er already mapped */
573 if (uaudio_qdev->er_mapped)
574 map = false;
575 break;
576 case MEM_XFER_RING:
577 iova = uaudio_get_iova(&uaudio_qdev->curr_xfer_ring_iova,
578 &uaudio_qdev->xfer_ring_iova_size,
579 &uaudio_qdev->xfer_ring_list, size);
580 break;
581 default:
582 dev_err(uaudio_qdev->data->dev, "unknown mem type %d\n", mtype);
583 }
584
585 if (!iova || !map)
586 return 0;
587
588 iommu_map(uaudio_qdev->data->domain, iova, pa, size, prot, GFP_KERNEL);
589
590 return iova;
591 }
592
uaudio_iommu_map_xfer_buf(bool dma_coherent,size_t size,struct sg_table * sgt)593 static unsigned long uaudio_iommu_map_xfer_buf(bool dma_coherent, size_t size,
594 struct sg_table *sgt)
595 {
596 struct scatterlist *sg;
597 unsigned long iova = 0;
598 size_t total_len = 0;
599 unsigned long iova_sg;
600 phys_addr_t pa_sg;
601 size_t sg_len;
602 int prot = uaudio_iommu_map_prot(dma_coherent);
603 int ret;
604 int i;
605
606 prot = IOMMU_READ | IOMMU_WRITE;
607
608 if (dma_coherent)
609 prot |= IOMMU_CACHE;
610
611 iova = uaudio_get_iova(&uaudio_qdev->curr_xfer_buf_iova,
612 &uaudio_qdev->xfer_buf_iova_size,
613 &uaudio_qdev->xfer_buf_list, size);
614 if (!iova)
615 goto done;
616
617 iova_sg = iova;
618 for_each_sg(sgt->sgl, sg, sgt->nents, i) {
619 sg_len = PAGE_ALIGN(sg->offset + sg->length);
620 pa_sg = page_to_phys(sg_page(sg));
621 ret = iommu_map(uaudio_qdev->data->domain, iova_sg, pa_sg, sg_len,
622 prot, GFP_KERNEL);
623 if (ret) {
624 uaudio_iommu_unmap(MEM_XFER_BUF, iova, size, total_len);
625 iova = 0;
626 goto done;
627 }
628
629 iova_sg += sg_len;
630 total_len += sg_len;
631 }
632
633 if (size != total_len) {
634 uaudio_iommu_unmap(MEM_XFER_BUF, iova, size, total_len);
635 iova = 0;
636 }
637 done:
638 return iova;
639 }
640
641 /* looks up alias, if any, for controller DT node and returns the index */
usb_get_controller_id(struct usb_device * udev)642 static int usb_get_controller_id(struct usb_device *udev)
643 {
644 if (udev->bus->sysdev && udev->bus->sysdev->of_node)
645 return of_alias_get_id(udev->bus->sysdev->of_node, "usb");
646
647 return -ENODEV;
648 }
649
650 /**
651 * uaudio_dev_intf_cleanup() - cleanup transfer resources
652 * @udev: usb device
653 * @info: usb offloading interface
654 *
655 * Cleans up the transfer ring related resources which are assigned per
656 * endpoint from XHCI. This is invoked when the USB endpoints are no
657 * longer in use by the adsp.
658 *
659 */
uaudio_dev_intf_cleanup(struct usb_device * udev,struct intf_info * info)660 static void uaudio_dev_intf_cleanup(struct usb_device *udev, struct intf_info *info)
661 {
662 uaudio_iommu_unmap(MEM_XFER_RING, info->data_xfer_ring_va,
663 info->data_xfer_ring_size, info->data_xfer_ring_size);
664 info->data_xfer_ring_va = 0;
665 info->data_xfer_ring_size = 0;
666
667 uaudio_iommu_unmap(MEM_XFER_RING, info->sync_xfer_ring_va,
668 info->sync_xfer_ring_size, info->sync_xfer_ring_size);
669 info->sync_xfer_ring_va = 0;
670 info->sync_xfer_ring_size = 0;
671
672 uaudio_iommu_unmap(MEM_XFER_BUF, info->xfer_buf_iova, info->xfer_buf_size,
673 info->xfer_buf_size);
674 info->xfer_buf_iova = 0;
675
676 usb_free_coherent(udev, info->xfer_buf_size, info->xfer_buf_cpu,
677 info->xfer_buf_dma);
678 info->xfer_buf_size = 0;
679 info->xfer_buf_cpu = NULL;
680 info->xfer_buf_dma = 0;
681
682 info->in_use = false;
683 }
684
685 /**
686 * uaudio_event_ring_cleanup_free() - cleanup secondary event ring
687 * @dev: usb offload device
688 *
689 * Cleans up the secondary event ring that was requested. This will
690 * occur when the adsp is no longer transferring data on the USB bus
691 * across all endpoints.
692 *
693 */
uaudio_event_ring_cleanup_free(struct uaudio_dev * dev)694 static void uaudio_event_ring_cleanup_free(struct uaudio_dev *dev)
695 {
696 clear_bit(dev->chip->card->number, &uaudio_qdev->card_slot);
697 /* all audio devices are disconnected */
698 if (!uaudio_qdev->card_slot) {
699 uaudio_iommu_unmap(MEM_EVENT_RING, IOVA_BASE, PAGE_SIZE,
700 PAGE_SIZE);
701 xhci_sideband_remove_interrupter(uadev[dev->chip->card->number].sb);
702 }
703 }
704
uaudio_dev_cleanup(struct uaudio_dev * dev)705 static void uaudio_dev_cleanup(struct uaudio_dev *dev)
706 {
707 int if_idx;
708
709 if (!dev->udev)
710 return;
711
712 /* free xfer buffer and unmap xfer ring and buf per interface */
713 for (if_idx = 0; if_idx < dev->num_intf; if_idx++) {
714 if (!dev->info[if_idx].in_use)
715 continue;
716 uaudio_dev_intf_cleanup(dev->udev, &dev->info[if_idx]);
717 dev_dbg(uaudio_qdev->data->dev,
718 "release resources: intf# %d card# %d\n",
719 dev->info[if_idx].intf_num, dev->chip->card->number);
720 }
721
722 dev->num_intf = 0;
723
724 /* free interface info */
725 kfree(dev->info);
726 dev->info = NULL;
727 uaudio_event_ring_cleanup_free(dev);
728 dev->udev = NULL;
729 }
730
731 /**
732 * disable_audio_stream() - disable usb snd endpoints
733 * @subs: usb substream
734 *
735 * Closes the USB SND endpoints associated with the current audio stream
736 * used. This will decrement the USB SND endpoint opened reference count.
737 *
738 */
disable_audio_stream(struct snd_usb_substream * subs)739 static void disable_audio_stream(struct snd_usb_substream *subs)
740 {
741 struct snd_usb_audio *chip = subs->stream->chip;
742
743 snd_usb_hw_free(subs);
744 snd_usb_autosuspend(chip);
745 }
746
747 /* QMI service disconnect handlers */
qmi_stop_session(void)748 static void qmi_stop_session(void)
749 {
750 struct snd_usb_substream *subs;
751 struct usb_host_endpoint *ep;
752 struct snd_usb_audio *chip;
753 struct intf_info *info;
754 int pcm_card_num;
755 int if_idx;
756 int idx;
757
758 guard(mutex)(&qdev_mutex);
759 /* find all active intf for set alt 0 and cleanup usb audio dev */
760 for (idx = 0; idx < SNDRV_CARDS; idx++) {
761 if (!atomic_read(&uadev[idx].in_use))
762 continue;
763
764 chip = uadev[idx].chip;
765 for (if_idx = 0; if_idx < uadev[idx].num_intf; if_idx++) {
766 if (!uadev[idx].info || !uadev[idx].info[if_idx].in_use)
767 continue;
768 info = &uadev[idx].info[if_idx];
769 pcm_card_num = info->pcm_card_num;
770 subs = find_substream(pcm_card_num, info->pcm_dev_num,
771 info->direction);
772 if (!subs || !chip || atomic_read(&chip->shutdown)) {
773 dev_err(&uadev[idx].udev->dev,
774 "no sub for c#%u dev#%u dir%u\n",
775 info->pcm_card_num,
776 info->pcm_dev_num,
777 info->direction);
778 continue;
779 }
780 /* Release XHCI endpoints */
781 if (info->data_ep_pipe)
782 ep = usb_pipe_endpoint(uadev[pcm_card_num].udev,
783 info->data_ep_pipe);
784 xhci_sideband_remove_endpoint(uadev[pcm_card_num].sb, ep);
785
786 if (info->sync_ep_pipe)
787 ep = usb_pipe_endpoint(uadev[pcm_card_num].udev,
788 info->sync_ep_pipe);
789 xhci_sideband_remove_endpoint(uadev[pcm_card_num].sb, ep);
790
791 disable_audio_stream(subs);
792 }
793 atomic_set(&uadev[idx].in_use, 0);
794 guard(mutex)(&chip->mutex);
795 uaudio_dev_cleanup(&uadev[idx]);
796 }
797 }
798
799 /**
800 * uaudio_sideband_notifier() - xHCI sideband event handler
801 * @intf: USB interface handle
802 * @evt: xHCI sideband event type
803 *
804 * This callback is executed when the xHCI sideband encounters a sequence
805 * that requires the sideband clients to take action. An example, is when
806 * xHCI frees the transfer ring, so the client has to ensure that the
807 * offload path is halted.
808 *
809 */
uaudio_sideband_notifier(struct usb_interface * intf,struct xhci_sideband_event * evt)810 static int uaudio_sideband_notifier(struct usb_interface *intf,
811 struct xhci_sideband_event *evt)
812 {
813 struct snd_usb_audio *chip;
814 struct uaudio_dev *dev;
815 int if_idx;
816
817 if (!intf || !evt)
818 return 0;
819
820 chip = usb_get_intfdata(intf);
821
822 guard(mutex)(&qdev_mutex);
823 guard(mutex)(&chip->mutex);
824
825 dev = &uadev[chip->card->number];
826
827 if (evt->type == XHCI_SIDEBAND_XFER_RING_FREE) {
828 unsigned int *ep = (unsigned int *) evt->evt_data;
829
830 for (if_idx = 0; if_idx < dev->num_intf; if_idx++) {
831 if (dev->info[if_idx].data_ep_idx == *ep ||
832 dev->info[if_idx].sync_ep_idx == *ep)
833 uaudio_send_disconnect_ind(chip);
834 }
835 }
836
837 return 0;
838 }
839
840 /**
841 * qmi_bye_cb() - qmi bye message callback
842 * @handle: QMI handle
843 * @node: id of the dying node
844 *
845 * This callback is invoked when the QMI bye control message is received
846 * from the QMI client. Handle the message accordingly by ensuring that
847 * the USB offload path is disabled and cleaned up. At this point, ADSP
848 * is not utilizing the USB bus.
849 *
850 */
qmi_bye_cb(struct qmi_handle * handle,unsigned int node)851 static void qmi_bye_cb(struct qmi_handle *handle, unsigned int node)
852 {
853 struct uaudio_qmi_svc *svc = uaudio_svc;
854
855 if (svc->uaudio_svc_hdl != handle)
856 return;
857
858 if (svc->client_connected && svc->client_sq.sq_node == node) {
859 qmi_stop_session();
860
861 /* clear QMI client parameters to block further QMI messages */
862 svc->client_sq.sq_node = 0;
863 svc->client_sq.sq_port = 0;
864 svc->client_sq.sq_family = 0;
865 svc->client_connected = false;
866 }
867 }
868
869 /**
870 * qmi_svc_disconnect_cb() - qmi client disconnected
871 * @handle: QMI handle
872 * @node: id of the dying node
873 * @port: port of the dying client
874 *
875 * Invoked when the remote QMI client is disconnected. Handle this event
876 * the same way as when the QMI bye message is received. This will ensure
877 * the USB offloading path is disabled and cleaned up.
878 *
879 */
qmi_svc_disconnect_cb(struct qmi_handle * handle,unsigned int node,unsigned int port)880 static void qmi_svc_disconnect_cb(struct qmi_handle *handle,
881 unsigned int node, unsigned int port)
882 {
883 struct uaudio_qmi_svc *svc;
884
885 if (!uaudio_svc)
886 return;
887
888 svc = uaudio_svc;
889 if (svc->uaudio_svc_hdl != handle)
890 return;
891
892 if (svc->client_connected && svc->client_sq.sq_node == node &&
893 svc->client_sq.sq_port == port) {
894 qmi_stop_session();
895
896 /* clear QMI client parameters to block further QMI messages */
897 svc->client_sq.sq_node = 0;
898 svc->client_sq.sq_port = 0;
899 svc->client_sq.sq_family = 0;
900 svc->client_connected = false;
901 }
902 }
903
904 /* QMI client callback handlers from QMI interface */
905 static struct qmi_ops uaudio_svc_ops_options = {
906 .bye = qmi_bye_cb,
907 .del_client = qmi_svc_disconnect_cb,
908 };
909
910 /* kref release callback when all streams are disabled */
uaudio_dev_release(struct kref * kref)911 static void uaudio_dev_release(struct kref *kref)
912 {
913 struct uaudio_dev *dev = container_of(kref, struct uaudio_dev, kref);
914
915 uaudio_event_ring_cleanup_free(dev);
916 atomic_set(&dev->in_use, 0);
917 wake_up(&dev->disconnect_wq);
918 }
919
920 /**
921 * enable_audio_stream() - enable usb snd endpoints
922 * @subs: usb substream
923 * @pcm_format: pcm format requested
924 * @channels: number of channels
925 * @cur_rate: sample rate
926 * @datainterval: interval
927 *
928 * Opens all USB SND endpoints used for the data interface. This will increment
929 * the USB SND endpoint's opened count. Requests to keep the interface resumed
930 * until the audio stream is stopped. Will issue the USB set interface control
931 * message to enable the data interface.
932 *
933 */
enable_audio_stream(struct snd_usb_substream * subs,snd_pcm_format_t pcm_format,unsigned int channels,unsigned int cur_rate,int datainterval)934 static int enable_audio_stream(struct snd_usb_substream *subs,
935 snd_pcm_format_t pcm_format,
936 unsigned int channels, unsigned int cur_rate,
937 int datainterval)
938 {
939 struct snd_pcm_hw_params params;
940 struct snd_usb_audio *chip;
941 struct snd_interval *i;
942 struct snd_mask *m;
943 int ret;
944
945 chip = subs->stream->chip;
946
947 _snd_pcm_hw_params_any(¶ms);
948
949 m = hw_param_mask(¶ms, SNDRV_PCM_HW_PARAM_FORMAT);
950 snd_mask_leave(m, pcm_format);
951
952 i = hw_param_interval(¶ms, SNDRV_PCM_HW_PARAM_CHANNELS);
953 snd_interval_setinteger(i);
954 i->min = channels;
955 i->max = channels;
956
957 i = hw_param_interval(¶ms, SNDRV_PCM_HW_PARAM_RATE);
958 snd_interval_setinteger(i);
959 i->min = cur_rate;
960 i->max = cur_rate;
961
962 pm_runtime_barrier(&chip->intf[0]->dev);
963 snd_usb_autoresume(chip);
964
965 ret = snd_usb_hw_params(subs, ¶ms);
966 if (ret < 0)
967 goto put_suspend;
968
969 if (!atomic_read(&chip->shutdown)) {
970 CLASS(snd_usb_lock, pm)(chip);
971 if (pm.err < 0) {
972 ret = pm.err;
973 goto detach_ep;
974 }
975
976 if (subs->sync_endpoint) {
977 ret = snd_usb_endpoint_prepare(chip, subs->sync_endpoint);
978 if (ret < 0)
979 goto detach_ep;
980 }
981
982 ret = snd_usb_endpoint_prepare(chip, subs->data_endpoint);
983 if (ret < 0)
984 goto detach_ep;
985
986 dev_dbg(uaudio_qdev->data->dev,
987 "selected %s iface:%d altsetting:%d datainterval:%dus\n",
988 subs->direction ? "capture" : "playback",
989 subs->cur_audiofmt->iface, subs->cur_audiofmt->altsetting,
990 (1 << subs->cur_audiofmt->datainterval) *
991 (subs->dev->speed >= USB_SPEED_HIGH ?
992 BUS_INTERVAL_HIGHSPEED_AND_ABOVE :
993 BUS_INTERVAL_FULL_SPEED));
994 }
995
996 return 0;
997
998 detach_ep:
999 snd_usb_hw_free(subs);
1000
1001 put_suspend:
1002 snd_usb_autosuspend(chip);
1003
1004 return ret;
1005 }
1006
1007 /**
1008 * uaudio_transfer_buffer_setup() - fetch and populate xfer buffer params
1009 * @subs: usb substream
1010 * @xfer_buf: xfer buf to be allocated
1011 * @xfer_buf_len: size of allocation
1012 * @mem_info: QMI response info
1013 *
1014 * Allocates and maps the transfer buffers that will be utilized by the
1015 * audio DSP. Will populate the information in the QMI response that is
1016 * sent back to the stream enable request.
1017 *
1018 */
uaudio_transfer_buffer_setup(struct snd_usb_substream * subs,void ** xfer_buf_cpu,u32 xfer_buf_len,struct mem_info_v01 * mem_info)1019 static int uaudio_transfer_buffer_setup(struct snd_usb_substream *subs,
1020 void **xfer_buf_cpu, u32 xfer_buf_len,
1021 struct mem_info_v01 *mem_info)
1022 {
1023 struct sg_table xfer_buf_sgt;
1024 dma_addr_t xfer_buf_dma;
1025 void *xfer_buf;
1026 u32 len = xfer_buf_len;
1027 bool dma_coherent;
1028 dma_addr_t xfer_buf_dma_sysdev;
1029 u32 remainder;
1030 u32 mult;
1031 int ret;
1032
1033 dma_coherent = dev_is_dma_coherent(subs->dev->bus->sysdev);
1034
1035 /* xfer buffer, multiple of 4K only */
1036 if (!len)
1037 len = PAGE_SIZE;
1038
1039 mult = len / PAGE_SIZE;
1040 remainder = len % PAGE_SIZE;
1041 len = mult * PAGE_SIZE;
1042 len += remainder ? PAGE_SIZE : 0;
1043
1044 if (len > MAX_XFER_BUFF_LEN) {
1045 dev_err(uaudio_qdev->data->dev,
1046 "req buf len %d > max buf len %lu, setting %lu\n",
1047 len, MAX_XFER_BUFF_LEN, MAX_XFER_BUFF_LEN);
1048 len = MAX_XFER_BUFF_LEN;
1049 }
1050
1051 /* get buffer mapped into subs->dev */
1052 xfer_buf = usb_alloc_coherent(subs->dev, len, GFP_KERNEL, &xfer_buf_dma);
1053 if (!xfer_buf)
1054 return -ENOMEM;
1055
1056 dma_get_sgtable(subs->dev->bus->sysdev, &xfer_buf_sgt, xfer_buf,
1057 xfer_buf_dma, len);
1058
1059 /* map the physical buffer into sysdev as well */
1060 xfer_buf_dma_sysdev = uaudio_iommu_map_xfer_buf(dma_coherent,
1061 len, &xfer_buf_sgt);
1062 if (!xfer_buf_dma_sysdev) {
1063 ret = -ENOMEM;
1064 goto unmap_sync;
1065 }
1066
1067 mem_info->dma = xfer_buf_dma;
1068 mem_info->size = len;
1069 mem_info->iova = PREPEND_SID_TO_IOVA(xfer_buf_dma_sysdev, uaudio_qdev->data->sid);
1070 *xfer_buf_cpu = xfer_buf;
1071 sg_free_table(&xfer_buf_sgt);
1072
1073 return 0;
1074
1075 unmap_sync:
1076 usb_free_coherent(subs->dev, len, xfer_buf, xfer_buf_dma);
1077
1078 return ret;
1079 }
1080
1081 /**
1082 * uaudio_endpoint_setup() - fetch and populate endpoint params
1083 * @subs: usb substream
1084 * @endpoint: usb endpoint to add
1085 * @card_num: uadev index
1086 * @mem_info: QMI response info
1087 * @ep_desc: QMI ep desc response field
1088 *
1089 * Initialize the USB endpoint being used for a particular USB
1090 * stream. Will request XHCI sec intr to reserve the EP for
1091 * offloading as well as populating the QMI response with the
1092 * transfer ring parameters.
1093 *
1094 */
1095 static phys_addr_t
uaudio_endpoint_setup(struct snd_usb_substream * subs,struct snd_usb_endpoint * endpoint,int card_num,struct mem_info_v01 * mem_info,struct usb_endpoint_descriptor_v01 * ep_desc)1096 uaudio_endpoint_setup(struct snd_usb_substream *subs,
1097 struct snd_usb_endpoint *endpoint, int card_num,
1098 struct mem_info_v01 *mem_info,
1099 struct usb_endpoint_descriptor_v01 *ep_desc)
1100 {
1101 struct usb_host_endpoint *ep;
1102 phys_addr_t tr_pa = 0;
1103 struct sg_table *sgt;
1104 bool dma_coherent;
1105 unsigned long iova;
1106 struct page *pg;
1107 int ret = -ENODEV;
1108
1109 dma_coherent = dev_is_dma_coherent(subs->dev->bus->sysdev);
1110
1111 ep = usb_pipe_endpoint(subs->dev, endpoint->pipe);
1112 if (!ep) {
1113 dev_err(uaudio_qdev->data->dev, "data ep # %d context is null\n",
1114 subs->data_endpoint->ep_num);
1115 goto exit;
1116 }
1117
1118 memcpy(ep_desc, &ep->desc, sizeof(ep->desc));
1119
1120 ret = xhci_sideband_add_endpoint(uadev[card_num].sb, ep);
1121 if (ret < 0) {
1122 dev_err(&subs->dev->dev,
1123 "failed to add data ep to sec intr\n");
1124 ret = -ENODEV;
1125 goto exit;
1126 }
1127
1128 sgt = xhci_sideband_get_endpoint_buffer(uadev[card_num].sb, ep);
1129 if (!sgt) {
1130 dev_err(&subs->dev->dev,
1131 "failed to get data ep ring address\n");
1132 ret = -ENODEV;
1133 goto remove_ep;
1134 }
1135
1136 pg = sg_page(sgt->sgl);
1137 tr_pa = page_to_phys(pg);
1138 mem_info->dma = sg_dma_address(sgt->sgl);
1139 sg_free_table(sgt);
1140
1141 /* data transfer ring */
1142 iova = uaudio_iommu_map_pa(MEM_XFER_RING, dma_coherent, tr_pa,
1143 PAGE_SIZE);
1144 if (!iova) {
1145 ret = -ENOMEM;
1146 goto clear_pa;
1147 }
1148
1149 mem_info->iova = PREPEND_SID_TO_IOVA(iova, uaudio_qdev->data->sid);
1150 mem_info->size = PAGE_SIZE;
1151
1152 return 0;
1153
1154 clear_pa:
1155 mem_info->dma = 0;
1156 remove_ep:
1157 xhci_sideband_remove_endpoint(uadev[card_num].sb, ep);
1158 exit:
1159 return ret;
1160 }
1161
1162 /**
1163 * uaudio_event_ring_setup() - fetch and populate event ring params
1164 * @subs: usb substream
1165 * @card_num: uadev index
1166 * @mem_info: QMI response info
1167 *
1168 * Register secondary interrupter to XHCI and fetch the event buffer info
1169 * and populate the information into the QMI response.
1170 *
1171 */
uaudio_event_ring_setup(struct snd_usb_substream * subs,int card_num,struct mem_info_v01 * mem_info)1172 static int uaudio_event_ring_setup(struct snd_usb_substream *subs,
1173 int card_num, struct mem_info_v01 *mem_info)
1174 {
1175 struct sg_table *sgt;
1176 phys_addr_t er_pa;
1177 bool dma_coherent;
1178 unsigned long iova;
1179 struct page *pg;
1180 int ret;
1181
1182 dma_coherent = dev_is_dma_coherent(subs->dev->bus->sysdev);
1183 er_pa = 0;
1184
1185 /* event ring */
1186 ret = xhci_sideband_create_interrupter(uadev[card_num].sb, 1, false,
1187 0, uaudio_qdev->data->intr_num);
1188 if (ret < 0) {
1189 dev_err(&subs->dev->dev, "failed to fetch interrupter\n");
1190 goto exit;
1191 }
1192
1193 sgt = xhci_sideband_get_event_buffer(uadev[card_num].sb);
1194 if (!sgt) {
1195 dev_err(&subs->dev->dev,
1196 "failed to get event ring address\n");
1197 ret = -ENODEV;
1198 goto remove_interrupter;
1199 }
1200
1201 pg = sg_page(sgt->sgl);
1202 er_pa = page_to_phys(pg);
1203 mem_info->dma = sg_dma_address(sgt->sgl);
1204 sg_free_table(sgt);
1205
1206 iova = uaudio_iommu_map_pa(MEM_EVENT_RING, dma_coherent, er_pa,
1207 PAGE_SIZE);
1208 if (!iova) {
1209 ret = -ENOMEM;
1210 goto clear_pa;
1211 }
1212
1213 mem_info->iova = PREPEND_SID_TO_IOVA(iova, uaudio_qdev->data->sid);
1214 mem_info->size = PAGE_SIZE;
1215
1216 return 0;
1217
1218 clear_pa:
1219 mem_info->dma = 0;
1220 remove_interrupter:
1221 xhci_sideband_remove_interrupter(uadev[card_num].sb);
1222 exit:
1223 return ret;
1224 }
1225
1226 /**
1227 * uaudio_populate_uac_desc() - parse UAC parameters and populate QMI resp
1228 * @subs: usb substream
1229 * @resp: QMI response buffer
1230 *
1231 * Parses information specified within UAC descriptors which explain the
1232 * sample parameters that the device expects. This information is populated
1233 * to the QMI response sent back to the audio DSP.
1234 *
1235 */
uaudio_populate_uac_desc(struct snd_usb_substream * subs,struct qmi_uaudio_stream_resp_msg_v01 * resp)1236 static int uaudio_populate_uac_desc(struct snd_usb_substream *subs,
1237 struct qmi_uaudio_stream_resp_msg_v01 *resp)
1238 {
1239 struct usb_interface_descriptor *altsd;
1240 struct usb_host_interface *alts;
1241 struct usb_interface *iface;
1242 int protocol;
1243
1244 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
1245 if (!iface) {
1246 dev_err(&subs->dev->dev, "interface # %d does not exist\n",
1247 subs->cur_audiofmt->iface);
1248 return -ENODEV;
1249 }
1250
1251 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
1252 altsd = get_iface_desc(alts);
1253 protocol = altsd->bInterfaceProtocol;
1254
1255 if (protocol == UAC_VERSION_1) {
1256 struct uac1_as_header_descriptor *as;
1257
1258 as = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL,
1259 UAC_AS_GENERAL);
1260 if (!as) {
1261 dev_err(&subs->dev->dev,
1262 "%u:%d : no UAC_AS_GENERAL desc\n",
1263 subs->cur_audiofmt->iface,
1264 subs->cur_audiofmt->altset_idx);
1265 return -ENODEV;
1266 }
1267
1268 resp->data_path_delay = as->bDelay;
1269 resp->data_path_delay_valid = 1;
1270
1271 resp->usb_audio_subslot_size = subs->cur_audiofmt->fmt_sz;
1272 resp->usb_audio_subslot_size_valid = 1;
1273
1274 resp->usb_audio_spec_revision = le16_to_cpu((__force __le16)0x0100);
1275 resp->usb_audio_spec_revision_valid = 1;
1276 } else if (protocol == UAC_VERSION_2) {
1277 resp->usb_audio_subslot_size = subs->cur_audiofmt->fmt_sz;
1278 resp->usb_audio_subslot_size_valid = 1;
1279
1280 resp->usb_audio_spec_revision = le16_to_cpu((__force __le16)0x0200);
1281 resp->usb_audio_spec_revision_valid = 1;
1282 } else if (protocol == UAC_VERSION_3) {
1283 if (iface->intf_assoc->bFunctionSubClass ==
1284 UAC3_FUNCTION_SUBCLASS_FULL_ADC_3_0) {
1285 dev_err(&subs->dev->dev,
1286 "full adc is not supported\n");
1287 return -EINVAL;
1288 }
1289
1290 switch (le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize)) {
1291 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_16:
1292 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_16:
1293 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_16:
1294 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_16: {
1295 resp->usb_audio_subslot_size = 0x2;
1296 break;
1297 }
1298
1299 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_24:
1300 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_24:
1301 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_24:
1302 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_24: {
1303 resp->usb_audio_subslot_size = 0x3;
1304 break;
1305 }
1306
1307 default:
1308 dev_err(&subs->dev->dev,
1309 "%d: %u: Invalid wMaxPacketSize\n",
1310 subs->cur_audiofmt->iface,
1311 subs->cur_audiofmt->altset_idx);
1312 return -EINVAL;
1313 }
1314 resp->usb_audio_subslot_size_valid = 1;
1315 } else {
1316 dev_err(&subs->dev->dev, "unknown protocol version %x\n",
1317 protocol);
1318 return -ENODEV;
1319 }
1320
1321 memcpy(&resp->std_as_opr_intf_desc, &alts->desc, sizeof(alts->desc));
1322
1323 return 0;
1324 }
1325
1326 /**
1327 * prepare_qmi_response() - prepare stream enable response
1328 * @subs: usb substream
1329 * @req_msg: QMI request message
1330 * @resp: QMI response buffer
1331 * @info_idx: usb interface array index
1332 *
1333 * Prepares the QMI response for a USB QMI stream enable request. Will parse
1334 * out the parameters within the stream enable request, in order to match
1335 * requested audio profile to the ones exposed by the USB device connected.
1336 *
1337 * In addition, will fetch the XHCI transfer resources needed for the handoff to
1338 * happen. This includes, transfer ring and buffer addresses and secondary event
1339 * ring address. These parameters will be communicated as part of the USB QMI
1340 * stream enable response.
1341 *
1342 */
prepare_qmi_response(struct snd_usb_substream * subs,struct qmi_uaudio_stream_req_msg_v01 * req_msg,struct qmi_uaudio_stream_resp_msg_v01 * resp,int info_idx)1343 static int prepare_qmi_response(struct snd_usb_substream *subs,
1344 struct qmi_uaudio_stream_req_msg_v01 *req_msg,
1345 struct qmi_uaudio_stream_resp_msg_v01 *resp,
1346 int info_idx)
1347 {
1348 struct q6usb_offload *data;
1349 int pcm_dev_num;
1350 int card_num;
1351 void *xfer_buf_cpu;
1352 int ret;
1353
1354 pcm_dev_num = (req_msg->usb_token & QMI_STREAM_REQ_DEV_NUM_MASK) >> 8;
1355 card_num = (req_msg->usb_token & QMI_STREAM_REQ_CARD_NUM_MASK) >> 16;
1356
1357 if (!uadev[card_num].ctrl_intf) {
1358 dev_err(&subs->dev->dev, "audio ctrl intf info not cached\n");
1359 return -ENODEV;
1360 }
1361
1362 ret = uaudio_populate_uac_desc(subs, resp);
1363 if (ret < 0)
1364 return ret;
1365
1366 resp->slot_id = subs->dev->slot_id;
1367 resp->slot_id_valid = 1;
1368
1369 data = snd_soc_usb_find_priv_data(uaudio_qdev->auxdev->dev.parent);
1370 if (!data) {
1371 dev_err(&subs->dev->dev, "No private data found\n");
1372 return -ENODEV;
1373 }
1374
1375 uaudio_qdev->data = data;
1376
1377 resp->std_as_opr_intf_desc_valid = 1;
1378 ret = uaudio_endpoint_setup(subs, subs->data_endpoint, card_num,
1379 &resp->xhci_mem_info.tr_data,
1380 &resp->std_as_data_ep_desc);
1381 if (ret < 0)
1382 return ret;
1383
1384 resp->std_as_data_ep_desc_valid = 1;
1385
1386 if (subs->sync_endpoint) {
1387 ret = uaudio_endpoint_setup(subs, subs->sync_endpoint, card_num,
1388 &resp->xhci_mem_info.tr_sync,
1389 &resp->std_as_sync_ep_desc);
1390 if (ret < 0)
1391 goto drop_data_ep;
1392
1393 resp->std_as_sync_ep_desc_valid = 1;
1394 }
1395
1396 resp->interrupter_num_valid = 1;
1397 resp->controller_num_valid = 0;
1398 ret = usb_get_controller_id(subs->dev);
1399 if (ret >= 0) {
1400 resp->controller_num = ret;
1401 resp->controller_num_valid = 1;
1402 }
1403
1404 /* event ring */
1405 ret = uaudio_event_ring_setup(subs, card_num,
1406 &resp->xhci_mem_info.evt_ring);
1407 if (ret < 0)
1408 goto drop_sync_ep;
1409
1410 uaudio_qdev->er_mapped = true;
1411 resp->interrupter_num = xhci_sideband_interrupter_id(uadev[card_num].sb);
1412
1413 resp->speed_info = get_speed_info(subs->dev->speed);
1414 if (resp->speed_info == USB_QMI_DEVICE_SPEED_INVALID_V01) {
1415 ret = -ENODEV;
1416 goto free_sec_ring;
1417 }
1418
1419 resp->speed_info_valid = 1;
1420
1421 ret = uaudio_transfer_buffer_setup(subs, &xfer_buf_cpu, req_msg->xfer_buff_size,
1422 &resp->xhci_mem_info.xfer_buff);
1423 if (ret < 0) {
1424 ret = -ENOMEM;
1425 goto free_sec_ring;
1426 }
1427
1428 resp->xhci_mem_info_valid = 1;
1429
1430 if (!atomic_read(&uadev[card_num].in_use)) {
1431 kref_init(&uadev[card_num].kref);
1432 init_waitqueue_head(&uadev[card_num].disconnect_wq);
1433 uadev[card_num].num_intf =
1434 subs->dev->config->desc.bNumInterfaces;
1435 uadev[card_num].info = kcalloc(uadev[card_num].num_intf,
1436 sizeof(struct intf_info),
1437 GFP_KERNEL);
1438 if (!uadev[card_num].info) {
1439 ret = -ENOMEM;
1440 goto unmap_er;
1441 }
1442 uadev[card_num].udev = subs->dev;
1443 atomic_set(&uadev[card_num].in_use, 1);
1444 } else {
1445 kref_get(&uadev[card_num].kref);
1446 }
1447
1448 uadev[card_num].usb_core_id = resp->controller_num;
1449
1450 /* cache intf specific info to use it for unmap and free xfer buf */
1451 uadev[card_num].info[info_idx].data_xfer_ring_va =
1452 IOVA_MASK(resp->xhci_mem_info.tr_data.iova);
1453 uadev[card_num].info[info_idx].data_xfer_ring_size = PAGE_SIZE;
1454 uadev[card_num].info[info_idx].sync_xfer_ring_va =
1455 IOVA_MASK(resp->xhci_mem_info.tr_sync.iova);
1456 uadev[card_num].info[info_idx].sync_xfer_ring_size = PAGE_SIZE;
1457 uadev[card_num].info[info_idx].xfer_buf_iova =
1458 IOVA_MASK(resp->xhci_mem_info.xfer_buff.iova);
1459 uadev[card_num].info[info_idx].xfer_buf_dma =
1460 resp->xhci_mem_info.xfer_buff.dma;
1461 uadev[card_num].info[info_idx].xfer_buf_size =
1462 resp->xhci_mem_info.xfer_buff.size;
1463 uadev[card_num].info[info_idx].data_ep_pipe = subs->data_endpoint ?
1464 subs->data_endpoint->pipe : 0;
1465 uadev[card_num].info[info_idx].sync_ep_pipe = subs->sync_endpoint ?
1466 subs->sync_endpoint->pipe : 0;
1467 uadev[card_num].info[info_idx].data_ep_idx = subs->data_endpoint ?
1468 subs->data_endpoint->ep_num : 0;
1469 uadev[card_num].info[info_idx].sync_ep_idx = subs->sync_endpoint ?
1470 subs->sync_endpoint->ep_num : 0;
1471 uadev[card_num].info[info_idx].xfer_buf_cpu = xfer_buf_cpu;
1472 uadev[card_num].info[info_idx].pcm_card_num = card_num;
1473 uadev[card_num].info[info_idx].pcm_dev_num = pcm_dev_num;
1474 uadev[card_num].info[info_idx].direction = subs->direction;
1475 uadev[card_num].info[info_idx].intf_num = subs->cur_audiofmt->iface;
1476 uadev[card_num].info[info_idx].in_use = true;
1477
1478 set_bit(card_num, &uaudio_qdev->card_slot);
1479
1480 return 0;
1481
1482 unmap_er:
1483 uaudio_iommu_unmap(MEM_EVENT_RING, IOVA_BASE, PAGE_SIZE, PAGE_SIZE);
1484 free_sec_ring:
1485 xhci_sideband_remove_interrupter(uadev[card_num].sb);
1486 drop_sync_ep:
1487 if (subs->sync_endpoint) {
1488 uaudio_iommu_unmap(MEM_XFER_RING,
1489 IOVA_MASK(resp->xhci_mem_info.tr_sync.iova),
1490 PAGE_SIZE, PAGE_SIZE);
1491 xhci_sideband_remove_endpoint(uadev[card_num].sb,
1492 usb_pipe_endpoint(subs->dev, subs->sync_endpoint->pipe));
1493 }
1494 drop_data_ep:
1495 uaudio_iommu_unmap(MEM_XFER_RING, IOVA_MASK(resp->xhci_mem_info.tr_data.iova),
1496 PAGE_SIZE, PAGE_SIZE);
1497 xhci_sideband_remove_endpoint(uadev[card_num].sb,
1498 usb_pipe_endpoint(subs->dev, subs->data_endpoint->pipe));
1499
1500 return ret;
1501 }
1502
1503 /**
1504 * handle_uaudio_stream_req() - handle stream enable/disable request
1505 * @handle: QMI client handle
1506 * @sq: qrtr socket
1507 * @txn: QMI transaction context
1508 * @decoded_msg: decoded QMI message
1509 *
1510 * Main handler for the QMI stream enable/disable requests. This executes the
1511 * corresponding enable/disable stream apis, respectively.
1512 *
1513 */
handle_uaudio_stream_req(struct qmi_handle * handle,struct sockaddr_qrtr * sq,struct qmi_txn * txn,const void * decoded_msg)1514 static void handle_uaudio_stream_req(struct qmi_handle *handle,
1515 struct sockaddr_qrtr *sq,
1516 struct qmi_txn *txn,
1517 const void *decoded_msg)
1518 {
1519 struct qmi_uaudio_stream_req_msg_v01 *req_msg;
1520 struct qmi_uaudio_stream_resp_msg_v01 resp = {{0}, 0};
1521 struct uaudio_qmi_svc *svc = uaudio_svc;
1522 struct snd_usb_audio *chip = NULL;
1523 struct snd_usb_substream *subs;
1524 struct usb_host_endpoint *ep;
1525 int datainterval = -EINVAL;
1526 int info_idx = -EINVAL;
1527 struct intf_info *info;
1528 u8 pcm_card_num;
1529 u8 pcm_dev_num;
1530 u8 direction;
1531 int ret = 0;
1532
1533 if (!svc->client_connected) {
1534 svc->client_sq = *sq;
1535 svc->client_connected = true;
1536 }
1537
1538 mutex_lock(&qdev_mutex);
1539 req_msg = (struct qmi_uaudio_stream_req_msg_v01 *)decoded_msg;
1540 if (!req_msg->audio_format_valid || !req_msg->bit_rate_valid ||
1541 !req_msg->number_of_ch_valid || !req_msg->xfer_buff_size_valid) {
1542 ret = -EINVAL;
1543 goto response;
1544 }
1545
1546 if (!uaudio_qdev) {
1547 ret = -EINVAL;
1548 goto response;
1549 }
1550
1551 direction = (req_msg->usb_token & QMI_STREAM_REQ_DIRECTION);
1552 pcm_dev_num = (req_msg->usb_token & QMI_STREAM_REQ_DEV_NUM_MASK) >> 8;
1553 pcm_card_num = (req_msg->usb_token & QMI_STREAM_REQ_CARD_NUM_MASK) >> 16;
1554 if (pcm_card_num >= SNDRV_CARDS) {
1555 ret = -EINVAL;
1556 goto response;
1557 }
1558
1559 if (req_msg->audio_format > USB_QMI_PCM_FORMAT_U32_BE) {
1560 ret = -EINVAL;
1561 goto response;
1562 }
1563
1564 subs = find_substream(pcm_card_num, pcm_dev_num, direction);
1565 chip = uadev[pcm_card_num].chip;
1566 if (!subs || !chip || atomic_read(&chip->shutdown)) {
1567 ret = -ENODEV;
1568 goto response;
1569 }
1570
1571 info_idx = info_idx_from_ifnum(pcm_card_num, subs->cur_audiofmt ?
1572 subs->cur_audiofmt->iface : -1, req_msg->enable);
1573 if (atomic_read(&chip->shutdown) || !subs->stream || !subs->stream->pcm ||
1574 !subs->stream->chip) {
1575 ret = -ENODEV;
1576 goto response;
1577 }
1578
1579 scoped_guard(mutex, &chip->mutex) {
1580 if (req_msg->enable) {
1581 if (info_idx < 0 || chip->system_suspend || subs->opened) {
1582 ret = -EBUSY;
1583 goto response;
1584 }
1585 subs->opened = 1;
1586 }
1587 }
1588
1589 if (req_msg->service_interval_valid) {
1590 ret = get_data_interval_from_si(subs,
1591 req_msg->service_interval);
1592 if (ret == -EINVAL)
1593 goto response;
1594
1595 datainterval = ret;
1596 }
1597
1598 uadev[pcm_card_num].ctrl_intf = chip->ctrl_intf;
1599
1600 if (req_msg->enable) {
1601 ret = enable_audio_stream(subs,
1602 map_pcm_format(req_msg->audio_format),
1603 req_msg->number_of_ch, req_msg->bit_rate,
1604 datainterval);
1605
1606 if (!ret)
1607 ret = prepare_qmi_response(subs, req_msg, &resp,
1608 info_idx);
1609 if (ret < 0) {
1610 guard(mutex)(&chip->mutex);
1611 subs->opened = 0;
1612 }
1613 } else {
1614 info = &uadev[pcm_card_num].info[info_idx];
1615 if (info->data_ep_pipe) {
1616 ep = usb_pipe_endpoint(uadev[pcm_card_num].udev,
1617 info->data_ep_pipe);
1618 if (ep) {
1619 xhci_sideband_stop_endpoint(uadev[pcm_card_num].sb,
1620 ep);
1621 xhci_sideband_remove_endpoint(uadev[pcm_card_num].sb,
1622 ep);
1623 }
1624
1625 info->data_ep_pipe = 0;
1626 }
1627
1628 if (info->sync_ep_pipe) {
1629 ep = usb_pipe_endpoint(uadev[pcm_card_num].udev,
1630 info->sync_ep_pipe);
1631 if (ep) {
1632 xhci_sideband_stop_endpoint(uadev[pcm_card_num].sb,
1633 ep);
1634 xhci_sideband_remove_endpoint(uadev[pcm_card_num].sb,
1635 ep);
1636 }
1637
1638 info->sync_ep_pipe = 0;
1639 }
1640
1641 disable_audio_stream(subs);
1642 guard(mutex)(&chip->mutex);
1643 subs->opened = 0;
1644 }
1645
1646 response:
1647 if (!req_msg->enable && ret != -EINVAL && ret != -ENODEV) {
1648 guard(mutex)(&chip->mutex);
1649 if (info_idx >= 0) {
1650 info = &uadev[pcm_card_num].info[info_idx];
1651 uaudio_dev_intf_cleanup(uadev[pcm_card_num].udev,
1652 info);
1653 }
1654 if (atomic_read(&uadev[pcm_card_num].in_use))
1655 kref_put(&uadev[pcm_card_num].kref,
1656 uaudio_dev_release);
1657 }
1658 mutex_unlock(&qdev_mutex);
1659
1660 resp.usb_token = req_msg->usb_token;
1661 resp.usb_token_valid = 1;
1662 resp.internal_status = ret;
1663 resp.internal_status_valid = 1;
1664 resp.status = ret ? USB_QMI_STREAM_REQ_FAILURE_V01 : ret;
1665 resp.status_valid = 1;
1666 ret = qmi_send_response(svc->uaudio_svc_hdl, sq, txn,
1667 QMI_UAUDIO_STREAM_RESP_V01,
1668 QMI_UAUDIO_STREAM_RESP_MSG_V01_MAX_MSG_LEN,
1669 qmi_uaudio_stream_resp_msg_v01_ei, &resp);
1670 }
1671
1672 static struct qmi_msg_handler uaudio_stream_req_handlers = {
1673 .type = QMI_REQUEST,
1674 .msg_id = QMI_UAUDIO_STREAM_REQ_V01,
1675 .ei = qmi_uaudio_stream_req_msg_v01_ei,
1676 .decoded_size = QMI_UAUDIO_STREAM_REQ_MSG_V01_MAX_MSG_LEN,
1677 .fn = handle_uaudio_stream_req,
1678 };
1679
1680 /**
1681 * qc_usb_audio_offload_init_qmi_dev() - initializes qmi dev
1682 *
1683 * Initializes the USB qdev, which is used to carry information pertaining to
1684 * the offloading resources. This device is freed only when there are no longer
1685 * any offloading candidates. (i.e, when all audio devices are disconnected)
1686 *
1687 */
qc_usb_audio_offload_init_qmi_dev(void)1688 static int qc_usb_audio_offload_init_qmi_dev(void)
1689 {
1690 uaudio_qdev = kzalloc(sizeof(*uaudio_qdev), GFP_KERNEL);
1691 if (!uaudio_qdev)
1692 return -ENOMEM;
1693
1694 /* initialize xfer ring and xfer buf iova list */
1695 INIT_LIST_HEAD(&uaudio_qdev->xfer_ring_list);
1696 uaudio_qdev->curr_xfer_ring_iova = IOVA_XFER_RING_BASE;
1697 uaudio_qdev->xfer_ring_iova_size =
1698 IOVA_XFER_RING_MAX - IOVA_XFER_RING_BASE;
1699
1700 INIT_LIST_HEAD(&uaudio_qdev->xfer_buf_list);
1701 uaudio_qdev->curr_xfer_buf_iova = IOVA_XFER_BUF_BASE;
1702 uaudio_qdev->xfer_buf_iova_size =
1703 IOVA_XFER_BUF_MAX - IOVA_XFER_BUF_BASE;
1704
1705 return 0;
1706 }
1707
1708 /* Populates ppcm_idx array with supported PCM indexes */
qc_usb_audio_offload_fill_avail_pcms(struct snd_usb_audio * chip,struct snd_soc_usb_device * sdev)1709 static int qc_usb_audio_offload_fill_avail_pcms(struct snd_usb_audio *chip,
1710 struct snd_soc_usb_device *sdev)
1711 {
1712 struct snd_usb_stream *as;
1713 struct snd_usb_substream *subs;
1714 int idx = 0;
1715
1716 list_for_each_entry(as, &chip->pcm_list, list) {
1717 subs = &as->substream[SNDRV_PCM_STREAM_PLAYBACK];
1718 if (subs->ep_num) {
1719 sdev->ppcm_idx[idx] = as->pcm->device;
1720 idx++;
1721 }
1722 /*
1723 * Break if the current index exceeds the number of possible
1724 * playback streams counted from the UAC descriptors.
1725 */
1726 if (idx >= sdev->num_playback)
1727 break;
1728 }
1729
1730 return -1;
1731 }
1732
1733 /**
1734 * qc_usb_audio_offload_probe() - platform op connect handler
1735 * @chip: USB SND device
1736 *
1737 * Platform connect handler when a USB SND device is detected. Will
1738 * notify SOC USB about the connection to enable the USB ASoC backend
1739 * and populate internal USB chip array.
1740 *
1741 */
qc_usb_audio_offload_probe(struct snd_usb_audio * chip)1742 static void qc_usb_audio_offload_probe(struct snd_usb_audio *chip)
1743 {
1744 struct usb_interface *intf = chip->intf[chip->num_interfaces - 1];
1745 struct usb_interface_descriptor *altsd;
1746 struct usb_host_interface *alts;
1747 struct snd_soc_usb_device *sdev;
1748 struct xhci_sideband *sb;
1749
1750 /*
1751 * If there is no priv_data, or no playback paths, the connected
1752 * device doesn't support offloading. Avoid populating entries for
1753 * this device.
1754 */
1755 if (!snd_soc_usb_find_priv_data(uaudio_qdev->auxdev->dev.parent) ||
1756 !usb_qmi_get_pcm_num(chip, 0))
1757 return;
1758
1759 guard(mutex)(&qdev_mutex);
1760 guard(mutex)(&chip->mutex);
1761 if (!uadev[chip->card->number].chip) {
1762 sdev = kzalloc(sizeof(*sdev), GFP_KERNEL);
1763 if (!sdev)
1764 return;
1765
1766 sb = xhci_sideband_register(intf, XHCI_SIDEBAND_VENDOR,
1767 uaudio_sideband_notifier);
1768 if (!sb)
1769 goto free_sdev;
1770 } else {
1771 sb = uadev[chip->card->number].sb;
1772 sdev = uadev[chip->card->number].sdev;
1773 }
1774
1775 uadev[chip->card->number].sb = sb;
1776 uadev[chip->card->number].chip = chip;
1777 uadev[chip->card->number].sdev = sdev;
1778
1779 alts = &intf->altsetting[0];
1780 altsd = get_iface_desc(alts);
1781
1782 /* Wait until all PCM devices are populated before notifying soc-usb */
1783 if (altsd->bInterfaceNumber == chip->last_iface) {
1784 sdev->num_playback = usb_qmi_get_pcm_num(chip, 0);
1785
1786 /*
1787 * Allocate playback pcm index array based on number of possible
1788 * playback paths within the UAC descriptors.
1789 */
1790 sdev->ppcm_idx = kcalloc(sdev->num_playback, sizeof(unsigned int),
1791 GFP_KERNEL);
1792 if (!sdev->ppcm_idx)
1793 goto unreg_xhci;
1794
1795 qc_usb_audio_offload_fill_avail_pcms(chip, sdev);
1796 sdev->card_idx = chip->card->number;
1797 sdev->chip_idx = chip->index;
1798
1799 snd_usb_offload_create_ctl(chip, uaudio_qdev->auxdev->dev.parent);
1800 snd_soc_usb_connect(uaudio_qdev->auxdev->dev.parent, sdev);
1801 }
1802
1803 return;
1804
1805 unreg_xhci:
1806 xhci_sideband_unregister(sb);
1807 uadev[chip->card->number].sb = NULL;
1808 free_sdev:
1809 kfree(sdev);
1810 uadev[chip->card->number].sdev = NULL;
1811 uadev[chip->card->number].chip = NULL;
1812 }
1813
1814 /**
1815 * qc_usb_audio_cleanup_qmi_dev() - release qmi device
1816 *
1817 * Frees the USB qdev. Only occurs when there are no longer any potential
1818 * devices that can utilize USB audio offloading.
1819 *
1820 */
qc_usb_audio_cleanup_qmi_dev(void)1821 static void qc_usb_audio_cleanup_qmi_dev(void)
1822 {
1823 kfree(uaudio_qdev);
1824 uaudio_qdev = NULL;
1825 }
1826
1827 /**
1828 * qc_usb_audio_offload_disconnect() - platform op disconnect handler
1829 * @chip: USB SND device
1830 *
1831 * Platform disconnect handler. Will ensure that any pending stream is
1832 * halted by issuing a QMI disconnect indication packet to the adsp.
1833 *
1834 */
qc_usb_audio_offload_disconnect(struct snd_usb_audio * chip)1835 static void qc_usb_audio_offload_disconnect(struct snd_usb_audio *chip)
1836 {
1837 struct uaudio_dev *dev;
1838 int card_num;
1839
1840 if (!chip)
1841 return;
1842
1843 card_num = chip->card->number;
1844 if (card_num >= SNDRV_CARDS)
1845 return;
1846
1847 guard(mutex)(&qdev_mutex);
1848 guard(mutex)(&chip->mutex);
1849 dev = &uadev[card_num];
1850
1851 /* Device has already been cleaned up, or never populated */
1852 if (!dev->chip)
1853 return;
1854
1855 /* cleaned up already */
1856 if (!dev->udev)
1857 goto done;
1858
1859 uaudio_send_disconnect_ind(chip);
1860 uaudio_dev_cleanup(dev);
1861 done:
1862 /*
1863 * If num_interfaces == 1, the last USB SND interface is being removed.
1864 * This is to accommodate for devices w/ multiple UAC functions.
1865 */
1866 if (chip->num_interfaces == 1) {
1867 snd_soc_usb_disconnect(uaudio_qdev->auxdev->dev.parent, dev->sdev);
1868 xhci_sideband_unregister(dev->sb);
1869 dev->chip = NULL;
1870 kfree(dev->sdev->ppcm_idx);
1871 kfree(dev->sdev);
1872 dev->sdev = NULL;
1873 }
1874 }
1875
1876 /**
1877 * qc_usb_audio_offload_suspend() - USB offload PM suspend handler
1878 * @intf: USB interface
1879 * @message: suspend type
1880 *
1881 * PM suspend handler to ensure that the USB offloading driver is able to stop
1882 * any pending traffic, so that the bus can be suspended.
1883 *
1884 */
qc_usb_audio_offload_suspend(struct usb_interface * intf,pm_message_t message)1885 static void qc_usb_audio_offload_suspend(struct usb_interface *intf,
1886 pm_message_t message)
1887 {
1888 struct snd_usb_audio *chip = usb_get_intfdata(intf);
1889 int card_num;
1890
1891 if (!chip)
1892 return;
1893
1894 card_num = chip->card->number;
1895 if (card_num >= SNDRV_CARDS)
1896 return;
1897
1898 guard(mutex)(&qdev_mutex);
1899 guard(mutex)(&chip->mutex);
1900
1901 uaudio_send_disconnect_ind(chip);
1902 }
1903
1904 static struct snd_usb_platform_ops offload_ops = {
1905 .connect_cb = qc_usb_audio_offload_probe,
1906 .disconnect_cb = qc_usb_audio_offload_disconnect,
1907 .suspend_cb = qc_usb_audio_offload_suspend,
1908 };
1909
qc_usb_audio_probe(struct auxiliary_device * auxdev,const struct auxiliary_device_id * id)1910 static int qc_usb_audio_probe(struct auxiliary_device *auxdev,
1911 const struct auxiliary_device_id *id)
1912
1913 {
1914 struct uaudio_qmi_svc *svc;
1915 int ret;
1916
1917 svc = kzalloc(sizeof(*svc), GFP_KERNEL);
1918 if (!svc)
1919 return -ENOMEM;
1920
1921 svc->uaudio_svc_hdl = kzalloc(sizeof(*svc->uaudio_svc_hdl), GFP_KERNEL);
1922 if (!svc->uaudio_svc_hdl) {
1923 ret = -ENOMEM;
1924 goto free_svc;
1925 }
1926
1927 ret = qmi_handle_init(svc->uaudio_svc_hdl,
1928 QMI_UAUDIO_STREAM_REQ_MSG_V01_MAX_MSG_LEN,
1929 &uaudio_svc_ops_options,
1930 &uaudio_stream_req_handlers);
1931 ret = qmi_add_server(svc->uaudio_svc_hdl, UAUDIO_STREAM_SERVICE_ID_V01,
1932 UAUDIO_STREAM_SERVICE_VERS_V01, 0);
1933
1934 uaudio_svc = svc;
1935
1936 qc_usb_audio_offload_init_qmi_dev();
1937 uaudio_qdev->auxdev = auxdev;
1938
1939 ret = snd_usb_register_platform_ops(&offload_ops);
1940 if (ret < 0)
1941 goto release_qmi;
1942
1943 snd_usb_rediscover_devices();
1944
1945 return 0;
1946
1947 release_qmi:
1948 qc_usb_audio_cleanup_qmi_dev();
1949 qmi_handle_release(svc->uaudio_svc_hdl);
1950 free_svc:
1951 kfree(svc);
1952
1953 return ret;
1954 }
1955
qc_usb_audio_remove(struct auxiliary_device * auxdev)1956 static void qc_usb_audio_remove(struct auxiliary_device *auxdev)
1957 {
1958 struct uaudio_qmi_svc *svc = uaudio_svc;
1959 int idx;
1960
1961 /*
1962 * Remove all connected devices after unregistering ops, to ensure
1963 * that no further connect events will occur. The disconnect routine
1964 * will issue the QMI disconnect indication, which results in the
1965 * external DSP to stop issuing transfers.
1966 */
1967 snd_usb_unregister_platform_ops();
1968 for (idx = 0; idx < SNDRV_CARDS; idx++)
1969 qc_usb_audio_offload_disconnect(uadev[idx].chip);
1970
1971 qc_usb_audio_cleanup_qmi_dev();
1972
1973 qmi_handle_release(svc->uaudio_svc_hdl);
1974 kfree(svc);
1975 uaudio_svc = NULL;
1976 }
1977
1978 static const struct auxiliary_device_id qc_usb_audio_table[] = {
1979 { .name = "q6usb.qc-usb-audio-offload" },
1980 {},
1981 };
1982 MODULE_DEVICE_TABLE(auxiliary, qc_usb_audio_table);
1983
1984 static struct auxiliary_driver qc_usb_audio_offload_drv = {
1985 .name = "qc-usb-audio-offload",
1986 .id_table = qc_usb_audio_table,
1987 .probe = qc_usb_audio_probe,
1988 .remove = qc_usb_audio_remove,
1989 };
1990 module_auxiliary_driver(qc_usb_audio_offload_drv);
1991
1992 MODULE_DESCRIPTION("QC USB Audio Offloading");
1993 MODULE_LICENSE("GPL");
1994