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
541 /**
542 * uaudio_iommu_map() - maps iommu memory for adsp
543 * @mtype: ring type
544 * @dma_coherent: dma coherent
545 * @pa: physical address for ring/buffer
546 * @size: size of memory region
547 * @sgt: sg table for memory region
548 *
549 * Maps the XHCI related resources to a memory region that is assigned to be
550 * used by the adsp. This will be mapped to the domain, which is created by
551 * the ASoC USB backend driver.
552 *
553 */
uaudio_iommu_map(enum mem_type mtype,bool dma_coherent,phys_addr_t pa,size_t size,struct sg_table * sgt)554 static unsigned long uaudio_iommu_map(enum mem_type mtype, bool dma_coherent,
555 phys_addr_t pa, size_t size,
556 struct sg_table *sgt)
557 {
558 struct scatterlist *sg;
559 unsigned long iova = 0;
560 size_t total_len = 0;
561 unsigned long iova_sg;
562 phys_addr_t pa_sg;
563 bool map = true;
564 size_t sg_len;
565 int prot;
566 int ret;
567 int i;
568
569 prot = IOMMU_READ | IOMMU_WRITE;
570
571 if (dma_coherent)
572 prot |= IOMMU_CACHE;
573
574 switch (mtype) {
575 case MEM_EVENT_RING:
576 iova = IOVA_BASE;
577 /* er already mapped */
578 if (uaudio_qdev->er_mapped)
579 map = false;
580 break;
581 case MEM_XFER_RING:
582 iova = uaudio_get_iova(&uaudio_qdev->curr_xfer_ring_iova,
583 &uaudio_qdev->xfer_ring_iova_size,
584 &uaudio_qdev->xfer_ring_list, size);
585 break;
586 case MEM_XFER_BUF:
587 iova = uaudio_get_iova(&uaudio_qdev->curr_xfer_buf_iova,
588 &uaudio_qdev->xfer_buf_iova_size,
589 &uaudio_qdev->xfer_buf_list, size);
590 break;
591 default:
592 dev_err(uaudio_qdev->data->dev, "unknown mem type %d\n", mtype);
593 }
594
595 if (!iova || !map)
596 goto done;
597
598 if (!sgt)
599 goto skip_sgt_map;
600
601 iova_sg = iova;
602 for_each_sg(sgt->sgl, sg, sgt->nents, i) {
603 sg_len = PAGE_ALIGN(sg->offset + sg->length);
604 pa_sg = page_to_phys(sg_page(sg));
605 ret = iommu_map(uaudio_qdev->data->domain, iova_sg, pa_sg, sg_len,
606 prot, GFP_KERNEL);
607 if (ret) {
608 uaudio_iommu_unmap(MEM_XFER_BUF, iova, size, total_len);
609 iova = 0;
610 goto done;
611 }
612
613 iova_sg += sg_len;
614 total_len += sg_len;
615 }
616
617 if (size != total_len) {
618 uaudio_iommu_unmap(MEM_XFER_BUF, iova, size, total_len);
619 iova = 0;
620 }
621 return iova;
622
623 skip_sgt_map:
624 iommu_map(uaudio_qdev->data->domain, iova, pa, size, prot, GFP_KERNEL);
625
626 done:
627 return iova;
628 }
629
630 /* looks up alias, if any, for controller DT node and returns the index */
usb_get_controller_id(struct usb_device * udev)631 static int usb_get_controller_id(struct usb_device *udev)
632 {
633 if (udev->bus->sysdev && udev->bus->sysdev->of_node)
634 return of_alias_get_id(udev->bus->sysdev->of_node, "usb");
635
636 return -ENODEV;
637 }
638
639 /**
640 * uaudio_dev_intf_cleanup() - cleanup transfer resources
641 * @udev: usb device
642 * @info: usb offloading interface
643 *
644 * Cleans up the transfer ring related resources which are assigned per
645 * endpoint from XHCI. This is invoked when the USB endpoints are no
646 * longer in use by the adsp.
647 *
648 */
uaudio_dev_intf_cleanup(struct usb_device * udev,struct intf_info * info)649 static void uaudio_dev_intf_cleanup(struct usb_device *udev, struct intf_info *info)
650 {
651 uaudio_iommu_unmap(MEM_XFER_RING, info->data_xfer_ring_va,
652 info->data_xfer_ring_size, info->data_xfer_ring_size);
653 info->data_xfer_ring_va = 0;
654 info->data_xfer_ring_size = 0;
655
656 uaudio_iommu_unmap(MEM_XFER_RING, info->sync_xfer_ring_va,
657 info->sync_xfer_ring_size, info->sync_xfer_ring_size);
658 info->sync_xfer_ring_va = 0;
659 info->sync_xfer_ring_size = 0;
660
661 uaudio_iommu_unmap(MEM_XFER_BUF, info->xfer_buf_iova, info->xfer_buf_size,
662 info->xfer_buf_size);
663 info->xfer_buf_iova = 0;
664
665 usb_free_coherent(udev, info->xfer_buf_size, info->xfer_buf_cpu,
666 info->xfer_buf_dma);
667 info->xfer_buf_size = 0;
668 info->xfer_buf_cpu = NULL;
669 info->xfer_buf_dma = 0;
670
671 info->in_use = false;
672 }
673
674 /**
675 * uaudio_event_ring_cleanup_free() - cleanup secondary event ring
676 * @dev: usb offload device
677 *
678 * Cleans up the secondary event ring that was requested. This will
679 * occur when the adsp is no longer transferring data on the USB bus
680 * across all endpoints.
681 *
682 */
uaudio_event_ring_cleanup_free(struct uaudio_dev * dev)683 static void uaudio_event_ring_cleanup_free(struct uaudio_dev *dev)
684 {
685 clear_bit(dev->chip->card->number, &uaudio_qdev->card_slot);
686 /* all audio devices are disconnected */
687 if (!uaudio_qdev->card_slot) {
688 uaudio_iommu_unmap(MEM_EVENT_RING, IOVA_BASE, PAGE_SIZE,
689 PAGE_SIZE);
690 xhci_sideband_remove_interrupter(uadev[dev->chip->card->number].sb);
691 }
692 }
693
uaudio_dev_cleanup(struct uaudio_dev * dev)694 static void uaudio_dev_cleanup(struct uaudio_dev *dev)
695 {
696 int if_idx;
697
698 if (!dev->udev)
699 return;
700
701 /* free xfer buffer and unmap xfer ring and buf per interface */
702 for (if_idx = 0; if_idx < dev->num_intf; if_idx++) {
703 if (!dev->info[if_idx].in_use)
704 continue;
705 uaudio_dev_intf_cleanup(dev->udev, &dev->info[if_idx]);
706 dev_dbg(uaudio_qdev->data->dev,
707 "release resources: intf# %d card# %d\n",
708 dev->info[if_idx].intf_num, dev->chip->card->number);
709 }
710
711 dev->num_intf = 0;
712
713 /* free interface info */
714 kfree(dev->info);
715 dev->info = NULL;
716 uaudio_event_ring_cleanup_free(dev);
717 dev->udev = NULL;
718 }
719
720 /**
721 * disable_audio_stream() - disable usb snd endpoints
722 * @subs: usb substream
723 *
724 * Closes the USB SND endpoints associated with the current audio stream
725 * used. This will decrement the USB SND endpoint opened reference count.
726 *
727 */
disable_audio_stream(struct snd_usb_substream * subs)728 static void disable_audio_stream(struct snd_usb_substream *subs)
729 {
730 struct snd_usb_audio *chip = subs->stream->chip;
731
732 snd_usb_hw_free(subs);
733 snd_usb_autosuspend(chip);
734 }
735
736 /* QMI service disconnect handlers */
qmi_stop_session(void)737 static void qmi_stop_session(void)
738 {
739 struct snd_usb_substream *subs;
740 struct usb_host_endpoint *ep;
741 struct snd_usb_audio *chip;
742 struct intf_info *info;
743 int pcm_card_num;
744 int if_idx;
745 int idx;
746
747 mutex_lock(&qdev_mutex);
748 /* find all active intf for set alt 0 and cleanup usb audio dev */
749 for (idx = 0; idx < SNDRV_CARDS; idx++) {
750 if (!atomic_read(&uadev[idx].in_use))
751 continue;
752
753 chip = uadev[idx].chip;
754 for (if_idx = 0; if_idx < uadev[idx].num_intf; if_idx++) {
755 if (!uadev[idx].info || !uadev[idx].info[if_idx].in_use)
756 continue;
757 info = &uadev[idx].info[if_idx];
758 pcm_card_num = info->pcm_card_num;
759 subs = find_substream(pcm_card_num, info->pcm_dev_num,
760 info->direction);
761 if (!subs || !chip || atomic_read(&chip->shutdown)) {
762 dev_err(&uadev[idx].udev->dev,
763 "no sub for c#%u dev#%u dir%u\n",
764 info->pcm_card_num,
765 info->pcm_dev_num,
766 info->direction);
767 continue;
768 }
769 /* Release XHCI endpoints */
770 if (info->data_ep_pipe)
771 ep = usb_pipe_endpoint(uadev[pcm_card_num].udev,
772 info->data_ep_pipe);
773 xhci_sideband_remove_endpoint(uadev[pcm_card_num].sb, ep);
774
775 if (info->sync_ep_pipe)
776 ep = usb_pipe_endpoint(uadev[pcm_card_num].udev,
777 info->sync_ep_pipe);
778 xhci_sideband_remove_endpoint(uadev[pcm_card_num].sb, ep);
779
780 disable_audio_stream(subs);
781 }
782 atomic_set(&uadev[idx].in_use, 0);
783 mutex_lock(&chip->mutex);
784 uaudio_dev_cleanup(&uadev[idx]);
785 mutex_unlock(&chip->mutex);
786 }
787 mutex_unlock(&qdev_mutex);
788 }
789
790 /**
791 * uaudio_sideband_notifier() - xHCI sideband event handler
792 * @intf: USB interface handle
793 * @evt: xHCI sideband event type
794 *
795 * This callback is executed when the xHCI sideband encounters a sequence
796 * that requires the sideband clients to take action. An example, is when
797 * xHCI frees the transfer ring, so the client has to ensure that the
798 * offload path is halted.
799 *
800 */
uaudio_sideband_notifier(struct usb_interface * intf,struct xhci_sideband_event * evt)801 static int uaudio_sideband_notifier(struct usb_interface *intf,
802 struct xhci_sideband_event *evt)
803 {
804 struct snd_usb_audio *chip;
805 struct uaudio_dev *dev;
806 int if_idx;
807
808 if (!intf || !evt)
809 return 0;
810
811 chip = usb_get_intfdata(intf);
812
813 mutex_lock(&qdev_mutex);
814 mutex_lock(&chip->mutex);
815
816 dev = &uadev[chip->card->number];
817
818 if (evt->type == XHCI_SIDEBAND_XFER_RING_FREE) {
819 unsigned int *ep = (unsigned int *) evt->evt_data;
820
821 for (if_idx = 0; if_idx < dev->num_intf; if_idx++) {
822 if (dev->info[if_idx].data_ep_idx == *ep ||
823 dev->info[if_idx].sync_ep_idx == *ep)
824 uaudio_send_disconnect_ind(chip);
825 }
826 }
827
828 mutex_unlock(&qdev_mutex);
829 mutex_unlock(&chip->mutex);
830
831 return 0;
832 }
833
834 /**
835 * qmi_bye_cb() - qmi bye message callback
836 * @handle: QMI handle
837 * @node: id of the dying node
838 *
839 * This callback is invoked when the QMI bye control message is received
840 * from the QMI client. Handle the message accordingly by ensuring that
841 * the USB offload path is disabled and cleaned up. At this point, ADSP
842 * is not utilizing the USB bus.
843 *
844 */
qmi_bye_cb(struct qmi_handle * handle,unsigned int node)845 static void qmi_bye_cb(struct qmi_handle *handle, unsigned int node)
846 {
847 struct uaudio_qmi_svc *svc = uaudio_svc;
848
849 if (svc->uaudio_svc_hdl != handle)
850 return;
851
852 if (svc->client_connected && svc->client_sq.sq_node == node) {
853 qmi_stop_session();
854
855 /* clear QMI client parameters to block further QMI messages */
856 svc->client_sq.sq_node = 0;
857 svc->client_sq.sq_port = 0;
858 svc->client_sq.sq_family = 0;
859 svc->client_connected = false;
860 }
861 }
862
863 /**
864 * qmi_svc_disconnect_cb() - qmi client disconnected
865 * @handle: QMI handle
866 * @node: id of the dying node
867 * @port: port of the dying client
868 *
869 * Invoked when the remote QMI client is disconnected. Handle this event
870 * the same way as when the QMI bye message is received. This will ensure
871 * the USB offloading path is disabled and cleaned up.
872 *
873 */
qmi_svc_disconnect_cb(struct qmi_handle * handle,unsigned int node,unsigned int port)874 static void qmi_svc_disconnect_cb(struct qmi_handle *handle,
875 unsigned int node, unsigned int port)
876 {
877 struct uaudio_qmi_svc *svc;
878
879 if (!uaudio_svc)
880 return;
881
882 svc = uaudio_svc;
883 if (svc->uaudio_svc_hdl != handle)
884 return;
885
886 if (svc->client_connected && svc->client_sq.sq_node == node &&
887 svc->client_sq.sq_port == port) {
888 qmi_stop_session();
889
890 /* clear QMI client parameters to block further QMI messages */
891 svc->client_sq.sq_node = 0;
892 svc->client_sq.sq_port = 0;
893 svc->client_sq.sq_family = 0;
894 svc->client_connected = false;
895 }
896 }
897
898 /* QMI client callback handlers from QMI interface */
899 static struct qmi_ops uaudio_svc_ops_options = {
900 .bye = qmi_bye_cb,
901 .del_client = qmi_svc_disconnect_cb,
902 };
903
904 /* kref release callback when all streams are disabled */
uaudio_dev_release(struct kref * kref)905 static void uaudio_dev_release(struct kref *kref)
906 {
907 struct uaudio_dev *dev = container_of(kref, struct uaudio_dev, kref);
908
909 uaudio_event_ring_cleanup_free(dev);
910 atomic_set(&dev->in_use, 0);
911 wake_up(&dev->disconnect_wq);
912 }
913
914 /**
915 * enable_audio_stream() - enable usb snd endpoints
916 * @subs: usb substream
917 * @pcm_format: pcm format requested
918 * @channels: number of channels
919 * @cur_rate: sample rate
920 * @datainterval: interval
921 *
922 * Opens all USB SND endpoints used for the data interface. This will increment
923 * the USB SND endpoint's opened count. Requests to keep the interface resumed
924 * until the audio stream is stopped. Will issue the USB set interface control
925 * message to enable the data interface.
926 *
927 */
enable_audio_stream(struct snd_usb_substream * subs,snd_pcm_format_t pcm_format,unsigned int channels,unsigned int cur_rate,int datainterval)928 static int enable_audio_stream(struct snd_usb_substream *subs,
929 snd_pcm_format_t pcm_format,
930 unsigned int channels, unsigned int cur_rate,
931 int datainterval)
932 {
933 struct snd_pcm_hw_params params;
934 struct snd_usb_audio *chip;
935 struct snd_interval *i;
936 struct snd_mask *m;
937 int ret;
938
939 chip = subs->stream->chip;
940
941 _snd_pcm_hw_params_any(¶ms);
942
943 m = hw_param_mask(¶ms, SNDRV_PCM_HW_PARAM_FORMAT);
944 snd_mask_leave(m, pcm_format);
945
946 i = hw_param_interval(¶ms, SNDRV_PCM_HW_PARAM_CHANNELS);
947 snd_interval_setinteger(i);
948 i->min = channels;
949 i->max = channels;
950
951 i = hw_param_interval(¶ms, SNDRV_PCM_HW_PARAM_RATE);
952 snd_interval_setinteger(i);
953 i->min = cur_rate;
954 i->max = cur_rate;
955
956 pm_runtime_barrier(&chip->intf[0]->dev);
957 snd_usb_autoresume(chip);
958
959 ret = snd_usb_hw_params(subs, ¶ms);
960 if (ret < 0)
961 goto put_suspend;
962
963 if (!atomic_read(&chip->shutdown)) {
964 ret = snd_usb_lock_shutdown(chip);
965 if (ret < 0)
966 goto detach_ep;
967
968 if (subs->sync_endpoint) {
969 ret = snd_usb_endpoint_prepare(chip, subs->sync_endpoint);
970 if (ret < 0)
971 goto unlock;
972 }
973
974 ret = snd_usb_endpoint_prepare(chip, subs->data_endpoint);
975 if (ret < 0)
976 goto unlock;
977
978 snd_usb_unlock_shutdown(chip);
979
980 dev_dbg(uaudio_qdev->data->dev,
981 "selected %s iface:%d altsetting:%d datainterval:%dus\n",
982 subs->direction ? "capture" : "playback",
983 subs->cur_audiofmt->iface, subs->cur_audiofmt->altsetting,
984 (1 << subs->cur_audiofmt->datainterval) *
985 (subs->dev->speed >= USB_SPEED_HIGH ?
986 BUS_INTERVAL_HIGHSPEED_AND_ABOVE :
987 BUS_INTERVAL_FULL_SPEED));
988 }
989
990 return 0;
991
992 unlock:
993 snd_usb_unlock_shutdown(chip);
994
995 detach_ep:
996 snd_usb_hw_free(subs);
997
998 put_suspend:
999 snd_usb_autosuspend(chip);
1000
1001 return ret;
1002 }
1003
1004 /**
1005 * uaudio_transfer_buffer_setup() - fetch and populate xfer buffer params
1006 * @subs: usb substream
1007 * @xfer_buf: xfer buf to be allocated
1008 * @xfer_buf_len: size of allocation
1009 * @mem_info: QMI response info
1010 *
1011 * Allocates and maps the transfer buffers that will be utilized by the
1012 * audio DSP. Will populate the information in the QMI response that is
1013 * sent back to the stream enable request.
1014 *
1015 */
uaudio_transfer_buffer_setup(struct snd_usb_substream * subs,void ** xfer_buf_cpu,u32 xfer_buf_len,struct mem_info_v01 * mem_info)1016 static int uaudio_transfer_buffer_setup(struct snd_usb_substream *subs,
1017 void **xfer_buf_cpu, u32 xfer_buf_len,
1018 struct mem_info_v01 *mem_info)
1019 {
1020 struct sg_table xfer_buf_sgt;
1021 dma_addr_t xfer_buf_dma;
1022 void *xfer_buf;
1023 phys_addr_t xfer_buf_pa;
1024 u32 len = xfer_buf_len;
1025 bool dma_coherent;
1026 dma_addr_t xfer_buf_dma_sysdev;
1027 u32 remainder;
1028 u32 mult;
1029 int ret;
1030
1031 dma_coherent = dev_is_dma_coherent(subs->dev->bus->sysdev);
1032
1033 /* xfer buffer, multiple of 4K only */
1034 if (!len)
1035 len = PAGE_SIZE;
1036
1037 mult = len / PAGE_SIZE;
1038 remainder = len % PAGE_SIZE;
1039 len = mult * PAGE_SIZE;
1040 len += remainder ? PAGE_SIZE : 0;
1041
1042 if (len > MAX_XFER_BUFF_LEN) {
1043 dev_err(uaudio_qdev->data->dev,
1044 "req buf len %d > max buf len %lu, setting %lu\n",
1045 len, MAX_XFER_BUFF_LEN, MAX_XFER_BUFF_LEN);
1046 len = MAX_XFER_BUFF_LEN;
1047 }
1048
1049 /* get buffer mapped into subs->dev */
1050 xfer_buf = usb_alloc_coherent(subs->dev, len, GFP_KERNEL, &xfer_buf_dma);
1051 if (!xfer_buf)
1052 return -ENOMEM;
1053
1054 /* Remapping is not possible if xfer_buf is outside of linear map */
1055 xfer_buf_pa = virt_to_phys(xfer_buf);
1056 if (WARN_ON(!page_is_ram(PFN_DOWN(xfer_buf_pa)))) {
1057 ret = -ENXIO;
1058 goto unmap_sync;
1059 }
1060 dma_get_sgtable(subs->dev->bus->sysdev, &xfer_buf_sgt, xfer_buf,
1061 xfer_buf_dma, len);
1062
1063 /* map the physical buffer into sysdev as well */
1064 xfer_buf_dma_sysdev = uaudio_iommu_map(MEM_XFER_BUF, dma_coherent,
1065 xfer_buf_pa, len, &xfer_buf_sgt);
1066 if (!xfer_buf_dma_sysdev) {
1067 ret = -ENOMEM;
1068 goto unmap_sync;
1069 }
1070
1071 mem_info->dma = xfer_buf_dma;
1072 mem_info->size = len;
1073 mem_info->iova = PREPEND_SID_TO_IOVA(xfer_buf_dma_sysdev, uaudio_qdev->data->sid);
1074 *xfer_buf_cpu = xfer_buf;
1075 sg_free_table(&xfer_buf_sgt);
1076
1077 return 0;
1078
1079 unmap_sync:
1080 usb_free_coherent(subs->dev, len, xfer_buf, xfer_buf_dma);
1081
1082 return ret;
1083 }
1084
1085 /**
1086 * uaudio_endpoint_setup() - fetch and populate endpoint params
1087 * @subs: usb substream
1088 * @endpoint: usb endpoint to add
1089 * @card_num: uadev index
1090 * @mem_info: QMI response info
1091 * @ep_desc: QMI ep desc response field
1092 *
1093 * Initialize the USB endpoint being used for a particular USB
1094 * stream. Will request XHCI sec intr to reserve the EP for
1095 * offloading as well as populating the QMI response with the
1096 * transfer ring parameters.
1097 *
1098 */
1099 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)1100 uaudio_endpoint_setup(struct snd_usb_substream *subs,
1101 struct snd_usb_endpoint *endpoint, int card_num,
1102 struct mem_info_v01 *mem_info,
1103 struct usb_endpoint_descriptor_v01 *ep_desc)
1104 {
1105 struct usb_host_endpoint *ep;
1106 phys_addr_t tr_pa = 0;
1107 struct sg_table *sgt;
1108 bool dma_coherent;
1109 unsigned long iova;
1110 struct page *pg;
1111 int ret = -ENODEV;
1112
1113 dma_coherent = dev_is_dma_coherent(subs->dev->bus->sysdev);
1114
1115 ep = usb_pipe_endpoint(subs->dev, endpoint->pipe);
1116 if (!ep) {
1117 dev_err(uaudio_qdev->data->dev, "data ep # %d context is null\n",
1118 subs->data_endpoint->ep_num);
1119 goto exit;
1120 }
1121
1122 memcpy(ep_desc, &ep->desc, sizeof(ep->desc));
1123
1124 ret = xhci_sideband_add_endpoint(uadev[card_num].sb, ep);
1125 if (ret < 0) {
1126 dev_err(&subs->dev->dev,
1127 "failed to add data ep to sec intr\n");
1128 ret = -ENODEV;
1129 goto exit;
1130 }
1131
1132 sgt = xhci_sideband_get_endpoint_buffer(uadev[card_num].sb, ep);
1133 if (!sgt) {
1134 dev_err(&subs->dev->dev,
1135 "failed to get data ep ring address\n");
1136 ret = -ENODEV;
1137 goto remove_ep;
1138 }
1139
1140 pg = sg_page(sgt->sgl);
1141 tr_pa = page_to_phys(pg);
1142 mem_info->dma = sg_dma_address(sgt->sgl);
1143 sg_free_table(sgt);
1144
1145 /* data transfer ring */
1146 iova = uaudio_iommu_map(MEM_XFER_RING, dma_coherent, tr_pa,
1147 PAGE_SIZE, NULL);
1148 if (!iova) {
1149 ret = -ENOMEM;
1150 goto clear_pa;
1151 }
1152
1153 mem_info->iova = PREPEND_SID_TO_IOVA(iova, uaudio_qdev->data->sid);
1154 mem_info->size = PAGE_SIZE;
1155
1156 return 0;
1157
1158 clear_pa:
1159 mem_info->dma = 0;
1160 remove_ep:
1161 xhci_sideband_remove_endpoint(uadev[card_num].sb, ep);
1162 exit:
1163 return ret;
1164 }
1165
1166 /**
1167 * uaudio_event_ring_setup() - fetch and populate event ring params
1168 * @subs: usb substream
1169 * @card_num: uadev index
1170 * @mem_info: QMI response info
1171 *
1172 * Register secondary interrupter to XHCI and fetch the event buffer info
1173 * and populate the information into the QMI response.
1174 *
1175 */
uaudio_event_ring_setup(struct snd_usb_substream * subs,int card_num,struct mem_info_v01 * mem_info)1176 static int uaudio_event_ring_setup(struct snd_usb_substream *subs,
1177 int card_num, struct mem_info_v01 *mem_info)
1178 {
1179 struct sg_table *sgt;
1180 phys_addr_t er_pa;
1181 bool dma_coherent;
1182 unsigned long iova;
1183 struct page *pg;
1184 int ret;
1185
1186 dma_coherent = dev_is_dma_coherent(subs->dev->bus->sysdev);
1187 er_pa = 0;
1188
1189 /* event ring */
1190 ret = xhci_sideband_create_interrupter(uadev[card_num].sb, 1, false,
1191 0, uaudio_qdev->data->intr_num);
1192 if (ret < 0) {
1193 dev_err(&subs->dev->dev, "failed to fetch interrupter\n");
1194 goto exit;
1195 }
1196
1197 sgt = xhci_sideband_get_event_buffer(uadev[card_num].sb);
1198 if (!sgt) {
1199 dev_err(&subs->dev->dev,
1200 "failed to get event ring address\n");
1201 ret = -ENODEV;
1202 goto remove_interrupter;
1203 }
1204
1205 pg = sg_page(sgt->sgl);
1206 er_pa = page_to_phys(pg);
1207 mem_info->dma = sg_dma_address(sgt->sgl);
1208 sg_free_table(sgt);
1209
1210 iova = uaudio_iommu_map(MEM_EVENT_RING, dma_coherent, er_pa,
1211 PAGE_SIZE, NULL);
1212 if (!iova) {
1213 ret = -ENOMEM;
1214 goto clear_pa;
1215 }
1216
1217 mem_info->iova = PREPEND_SID_TO_IOVA(iova, uaudio_qdev->data->sid);
1218 mem_info->size = PAGE_SIZE;
1219
1220 return 0;
1221
1222 clear_pa:
1223 mem_info->dma = 0;
1224 remove_interrupter:
1225 xhci_sideband_remove_interrupter(uadev[card_num].sb);
1226 exit:
1227 return ret;
1228 }
1229
1230 /**
1231 * uaudio_populate_uac_desc() - parse UAC parameters and populate QMI resp
1232 * @subs: usb substream
1233 * @resp: QMI response buffer
1234 *
1235 * Parses information specified within UAC descriptors which explain the
1236 * sample parameters that the device expects. This information is populated
1237 * to the QMI response sent back to the audio DSP.
1238 *
1239 */
uaudio_populate_uac_desc(struct snd_usb_substream * subs,struct qmi_uaudio_stream_resp_msg_v01 * resp)1240 static int uaudio_populate_uac_desc(struct snd_usb_substream *subs,
1241 struct qmi_uaudio_stream_resp_msg_v01 *resp)
1242 {
1243 struct usb_interface_descriptor *altsd;
1244 struct usb_host_interface *alts;
1245 struct usb_interface *iface;
1246 int protocol;
1247
1248 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
1249 if (!iface) {
1250 dev_err(&subs->dev->dev, "interface # %d does not exist\n",
1251 subs->cur_audiofmt->iface);
1252 return -ENODEV;
1253 }
1254
1255 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
1256 altsd = get_iface_desc(alts);
1257 protocol = altsd->bInterfaceProtocol;
1258
1259 if (protocol == UAC_VERSION_1) {
1260 struct uac1_as_header_descriptor *as;
1261
1262 as = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL,
1263 UAC_AS_GENERAL);
1264 if (!as) {
1265 dev_err(&subs->dev->dev,
1266 "%u:%d : no UAC_AS_GENERAL desc\n",
1267 subs->cur_audiofmt->iface,
1268 subs->cur_audiofmt->altset_idx);
1269 return -ENODEV;
1270 }
1271
1272 resp->data_path_delay = as->bDelay;
1273 resp->data_path_delay_valid = 1;
1274
1275 resp->usb_audio_subslot_size = subs->cur_audiofmt->fmt_sz;
1276 resp->usb_audio_subslot_size_valid = 1;
1277
1278 resp->usb_audio_spec_revision = le16_to_cpu((__force __le16)0x0100);
1279 resp->usb_audio_spec_revision_valid = 1;
1280 } else if (protocol == UAC_VERSION_2) {
1281 resp->usb_audio_subslot_size = subs->cur_audiofmt->fmt_sz;
1282 resp->usb_audio_subslot_size_valid = 1;
1283
1284 resp->usb_audio_spec_revision = le16_to_cpu((__force __le16)0x0200);
1285 resp->usb_audio_spec_revision_valid = 1;
1286 } else if (protocol == UAC_VERSION_3) {
1287 if (iface->intf_assoc->bFunctionSubClass ==
1288 UAC3_FUNCTION_SUBCLASS_FULL_ADC_3_0) {
1289 dev_err(&subs->dev->dev,
1290 "full adc is not supported\n");
1291 return -EINVAL;
1292 }
1293
1294 switch (le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize)) {
1295 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_16:
1296 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_16:
1297 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_16:
1298 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_16: {
1299 resp->usb_audio_subslot_size = 0x2;
1300 break;
1301 }
1302
1303 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_24:
1304 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_24:
1305 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_24:
1306 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_24: {
1307 resp->usb_audio_subslot_size = 0x3;
1308 break;
1309 }
1310
1311 default:
1312 dev_err(&subs->dev->dev,
1313 "%d: %u: Invalid wMaxPacketSize\n",
1314 subs->cur_audiofmt->iface,
1315 subs->cur_audiofmt->altset_idx);
1316 return -EINVAL;
1317 }
1318 resp->usb_audio_subslot_size_valid = 1;
1319 } else {
1320 dev_err(&subs->dev->dev, "unknown protocol version %x\n",
1321 protocol);
1322 return -ENODEV;
1323 }
1324
1325 memcpy(&resp->std_as_opr_intf_desc, &alts->desc, sizeof(alts->desc));
1326
1327 return 0;
1328 }
1329
1330 /**
1331 * prepare_qmi_response() - prepare stream enable response
1332 * @subs: usb substream
1333 * @req_msg: QMI request message
1334 * @resp: QMI response buffer
1335 * @info_idx: usb interface array index
1336 *
1337 * Prepares the QMI response for a USB QMI stream enable request. Will parse
1338 * out the parameters within the stream enable request, in order to match
1339 * requested audio profile to the ones exposed by the USB device connected.
1340 *
1341 * In addition, will fetch the XHCI transfer resources needed for the handoff to
1342 * happen. This includes, transfer ring and buffer addresses and secondary event
1343 * ring address. These parameters will be communicated as part of the USB QMI
1344 * stream enable response.
1345 *
1346 */
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)1347 static int prepare_qmi_response(struct snd_usb_substream *subs,
1348 struct qmi_uaudio_stream_req_msg_v01 *req_msg,
1349 struct qmi_uaudio_stream_resp_msg_v01 *resp,
1350 int info_idx)
1351 {
1352 struct q6usb_offload *data;
1353 int pcm_dev_num;
1354 int card_num;
1355 void *xfer_buf_cpu;
1356 int ret;
1357
1358 pcm_dev_num = (req_msg->usb_token & QMI_STREAM_REQ_DEV_NUM_MASK) >> 8;
1359 card_num = (req_msg->usb_token & QMI_STREAM_REQ_CARD_NUM_MASK) >> 16;
1360
1361 if (!uadev[card_num].ctrl_intf) {
1362 dev_err(&subs->dev->dev, "audio ctrl intf info not cached\n");
1363 return -ENODEV;
1364 }
1365
1366 ret = uaudio_populate_uac_desc(subs, resp);
1367 if (ret < 0)
1368 return ret;
1369
1370 resp->slot_id = subs->dev->slot_id;
1371 resp->slot_id_valid = 1;
1372
1373 data = snd_soc_usb_find_priv_data(uaudio_qdev->auxdev->dev.parent);
1374 if (!data) {
1375 dev_err(&subs->dev->dev, "No private data found\n");
1376 return -ENODEV;
1377 }
1378
1379 uaudio_qdev->data = data;
1380
1381 resp->std_as_opr_intf_desc_valid = 1;
1382 ret = uaudio_endpoint_setup(subs, subs->data_endpoint, card_num,
1383 &resp->xhci_mem_info.tr_data,
1384 &resp->std_as_data_ep_desc);
1385 if (ret < 0)
1386 return ret;
1387
1388 resp->std_as_data_ep_desc_valid = 1;
1389
1390 if (subs->sync_endpoint) {
1391 ret = uaudio_endpoint_setup(subs, subs->sync_endpoint, card_num,
1392 &resp->xhci_mem_info.tr_sync,
1393 &resp->std_as_sync_ep_desc);
1394 if (ret < 0)
1395 goto drop_data_ep;
1396
1397 resp->std_as_sync_ep_desc_valid = 1;
1398 }
1399
1400 resp->interrupter_num_valid = 1;
1401 resp->controller_num_valid = 0;
1402 ret = usb_get_controller_id(subs->dev);
1403 if (ret >= 0) {
1404 resp->controller_num = ret;
1405 resp->controller_num_valid = 1;
1406 }
1407
1408 /* event ring */
1409 ret = uaudio_event_ring_setup(subs, card_num,
1410 &resp->xhci_mem_info.evt_ring);
1411 if (ret < 0)
1412 goto drop_sync_ep;
1413
1414 uaudio_qdev->er_mapped = true;
1415 resp->interrupter_num = xhci_sideband_interrupter_id(uadev[card_num].sb);
1416
1417 resp->speed_info = get_speed_info(subs->dev->speed);
1418 if (resp->speed_info == USB_QMI_DEVICE_SPEED_INVALID_V01) {
1419 ret = -ENODEV;
1420 goto free_sec_ring;
1421 }
1422
1423 resp->speed_info_valid = 1;
1424
1425 ret = uaudio_transfer_buffer_setup(subs, &xfer_buf_cpu, req_msg->xfer_buff_size,
1426 &resp->xhci_mem_info.xfer_buff);
1427 if (ret < 0) {
1428 ret = -ENOMEM;
1429 goto free_sec_ring;
1430 }
1431
1432 resp->xhci_mem_info_valid = 1;
1433
1434 if (!atomic_read(&uadev[card_num].in_use)) {
1435 kref_init(&uadev[card_num].kref);
1436 init_waitqueue_head(&uadev[card_num].disconnect_wq);
1437 uadev[card_num].num_intf =
1438 subs->dev->config->desc.bNumInterfaces;
1439 uadev[card_num].info = kcalloc(uadev[card_num].num_intf,
1440 sizeof(struct intf_info),
1441 GFP_KERNEL);
1442 if (!uadev[card_num].info) {
1443 ret = -ENOMEM;
1444 goto unmap_er;
1445 }
1446 uadev[card_num].udev = subs->dev;
1447 atomic_set(&uadev[card_num].in_use, 1);
1448 } else {
1449 kref_get(&uadev[card_num].kref);
1450 }
1451
1452 uadev[card_num].usb_core_id = resp->controller_num;
1453
1454 /* cache intf specific info to use it for unmap and free xfer buf */
1455 uadev[card_num].info[info_idx].data_xfer_ring_va =
1456 IOVA_MASK(resp->xhci_mem_info.tr_data.iova);
1457 uadev[card_num].info[info_idx].data_xfer_ring_size = PAGE_SIZE;
1458 uadev[card_num].info[info_idx].sync_xfer_ring_va =
1459 IOVA_MASK(resp->xhci_mem_info.tr_sync.iova);
1460 uadev[card_num].info[info_idx].sync_xfer_ring_size = PAGE_SIZE;
1461 uadev[card_num].info[info_idx].xfer_buf_iova =
1462 IOVA_MASK(resp->xhci_mem_info.xfer_buff.iova);
1463 uadev[card_num].info[info_idx].xfer_buf_dma =
1464 resp->xhci_mem_info.xfer_buff.dma;
1465 uadev[card_num].info[info_idx].xfer_buf_size =
1466 resp->xhci_mem_info.xfer_buff.size;
1467 uadev[card_num].info[info_idx].data_ep_pipe = subs->data_endpoint ?
1468 subs->data_endpoint->pipe : 0;
1469 uadev[card_num].info[info_idx].sync_ep_pipe = subs->sync_endpoint ?
1470 subs->sync_endpoint->pipe : 0;
1471 uadev[card_num].info[info_idx].data_ep_idx = subs->data_endpoint ?
1472 subs->data_endpoint->ep_num : 0;
1473 uadev[card_num].info[info_idx].sync_ep_idx = subs->sync_endpoint ?
1474 subs->sync_endpoint->ep_num : 0;
1475 uadev[card_num].info[info_idx].xfer_buf_cpu = xfer_buf_cpu;
1476 uadev[card_num].info[info_idx].pcm_card_num = card_num;
1477 uadev[card_num].info[info_idx].pcm_dev_num = pcm_dev_num;
1478 uadev[card_num].info[info_idx].direction = subs->direction;
1479 uadev[card_num].info[info_idx].intf_num = subs->cur_audiofmt->iface;
1480 uadev[card_num].info[info_idx].in_use = true;
1481
1482 set_bit(card_num, &uaudio_qdev->card_slot);
1483
1484 return 0;
1485
1486 unmap_er:
1487 uaudio_iommu_unmap(MEM_EVENT_RING, IOVA_BASE, PAGE_SIZE, PAGE_SIZE);
1488 free_sec_ring:
1489 xhci_sideband_remove_interrupter(uadev[card_num].sb);
1490 drop_sync_ep:
1491 if (subs->sync_endpoint) {
1492 uaudio_iommu_unmap(MEM_XFER_RING,
1493 IOVA_MASK(resp->xhci_mem_info.tr_sync.iova),
1494 PAGE_SIZE, PAGE_SIZE);
1495 xhci_sideband_remove_endpoint(uadev[card_num].sb,
1496 usb_pipe_endpoint(subs->dev, subs->sync_endpoint->pipe));
1497 }
1498 drop_data_ep:
1499 uaudio_iommu_unmap(MEM_XFER_RING, IOVA_MASK(resp->xhci_mem_info.tr_data.iova),
1500 PAGE_SIZE, PAGE_SIZE);
1501 xhci_sideband_remove_endpoint(uadev[card_num].sb,
1502 usb_pipe_endpoint(subs->dev, subs->data_endpoint->pipe));
1503
1504 return ret;
1505 }
1506
1507 /**
1508 * handle_uaudio_stream_req() - handle stream enable/disable request
1509 * @handle: QMI client handle
1510 * @sq: qrtr socket
1511 * @txn: QMI transaction context
1512 * @decoded_msg: decoded QMI message
1513 *
1514 * Main handler for the QMI stream enable/disable requests. This executes the
1515 * corresponding enable/disable stream apis, respectively.
1516 *
1517 */
handle_uaudio_stream_req(struct qmi_handle * handle,struct sockaddr_qrtr * sq,struct qmi_txn * txn,const void * decoded_msg)1518 static void handle_uaudio_stream_req(struct qmi_handle *handle,
1519 struct sockaddr_qrtr *sq,
1520 struct qmi_txn *txn,
1521 const void *decoded_msg)
1522 {
1523 struct qmi_uaudio_stream_req_msg_v01 *req_msg;
1524 struct qmi_uaudio_stream_resp_msg_v01 resp = {{0}, 0};
1525 struct uaudio_qmi_svc *svc = uaudio_svc;
1526 struct snd_usb_audio *chip = NULL;
1527 struct snd_usb_substream *subs;
1528 struct usb_host_endpoint *ep;
1529 int datainterval = -EINVAL;
1530 int info_idx = -EINVAL;
1531 struct intf_info *info;
1532 u8 pcm_card_num;
1533 u8 pcm_dev_num;
1534 u8 direction;
1535 int ret = 0;
1536
1537 if (!svc->client_connected) {
1538 svc->client_sq = *sq;
1539 svc->client_connected = true;
1540 }
1541
1542 mutex_lock(&qdev_mutex);
1543 req_msg = (struct qmi_uaudio_stream_req_msg_v01 *)decoded_msg;
1544 if (!req_msg->audio_format_valid || !req_msg->bit_rate_valid ||
1545 !req_msg->number_of_ch_valid || !req_msg->xfer_buff_size_valid) {
1546 ret = -EINVAL;
1547 goto response;
1548 }
1549
1550 if (!uaudio_qdev) {
1551 ret = -EINVAL;
1552 goto response;
1553 }
1554
1555 direction = (req_msg->usb_token & QMI_STREAM_REQ_DIRECTION);
1556 pcm_dev_num = (req_msg->usb_token & QMI_STREAM_REQ_DEV_NUM_MASK) >> 8;
1557 pcm_card_num = (req_msg->usb_token & QMI_STREAM_REQ_CARD_NUM_MASK) >> 16;
1558 if (pcm_card_num >= SNDRV_CARDS) {
1559 ret = -EINVAL;
1560 goto response;
1561 }
1562
1563 if (req_msg->audio_format > USB_QMI_PCM_FORMAT_U32_BE) {
1564 ret = -EINVAL;
1565 goto response;
1566 }
1567
1568 subs = find_substream(pcm_card_num, pcm_dev_num, direction);
1569 chip = uadev[pcm_card_num].chip;
1570 if (!subs || !chip || atomic_read(&chip->shutdown)) {
1571 ret = -ENODEV;
1572 goto response;
1573 }
1574
1575 info_idx = info_idx_from_ifnum(pcm_card_num, subs->cur_audiofmt ?
1576 subs->cur_audiofmt->iface : -1, req_msg->enable);
1577 if (atomic_read(&chip->shutdown) || !subs->stream || !subs->stream->pcm ||
1578 !subs->stream->chip) {
1579 ret = -ENODEV;
1580 goto response;
1581 }
1582
1583 mutex_lock(&chip->mutex);
1584 if (req_msg->enable) {
1585 if (info_idx < 0 || chip->system_suspend || subs->opened) {
1586 ret = -EBUSY;
1587 mutex_unlock(&chip->mutex);
1588
1589 goto response;
1590 }
1591 subs->opened = 1;
1592 }
1593 mutex_unlock(&chip->mutex);
1594
1595 if (req_msg->service_interval_valid) {
1596 ret = get_data_interval_from_si(subs,
1597 req_msg->service_interval);
1598 if (ret == -EINVAL)
1599 goto response;
1600
1601 datainterval = ret;
1602 }
1603
1604 uadev[pcm_card_num].ctrl_intf = chip->ctrl_intf;
1605
1606 if (req_msg->enable) {
1607 ret = enable_audio_stream(subs,
1608 map_pcm_format(req_msg->audio_format),
1609 req_msg->number_of_ch, req_msg->bit_rate,
1610 datainterval);
1611
1612 if (!ret)
1613 ret = prepare_qmi_response(subs, req_msg, &resp,
1614 info_idx);
1615 if (ret < 0) {
1616 mutex_lock(&chip->mutex);
1617 subs->opened = 0;
1618 mutex_unlock(&chip->mutex);
1619 }
1620 } else {
1621 info = &uadev[pcm_card_num].info[info_idx];
1622 if (info->data_ep_pipe) {
1623 ep = usb_pipe_endpoint(uadev[pcm_card_num].udev,
1624 info->data_ep_pipe);
1625 if (ep) {
1626 xhci_sideband_stop_endpoint(uadev[pcm_card_num].sb,
1627 ep);
1628 xhci_sideband_remove_endpoint(uadev[pcm_card_num].sb,
1629 ep);
1630 }
1631
1632 info->data_ep_pipe = 0;
1633 }
1634
1635 if (info->sync_ep_pipe) {
1636 ep = usb_pipe_endpoint(uadev[pcm_card_num].udev,
1637 info->sync_ep_pipe);
1638 if (ep) {
1639 xhci_sideband_stop_endpoint(uadev[pcm_card_num].sb,
1640 ep);
1641 xhci_sideband_remove_endpoint(uadev[pcm_card_num].sb,
1642 ep);
1643 }
1644
1645 info->sync_ep_pipe = 0;
1646 }
1647
1648 disable_audio_stream(subs);
1649 mutex_lock(&chip->mutex);
1650 subs->opened = 0;
1651 mutex_unlock(&chip->mutex);
1652 }
1653
1654 response:
1655 if (!req_msg->enable && ret != -EINVAL && ret != -ENODEV) {
1656 mutex_lock(&chip->mutex);
1657 if (info_idx >= 0) {
1658 info = &uadev[pcm_card_num].info[info_idx];
1659 uaudio_dev_intf_cleanup(uadev[pcm_card_num].udev,
1660 info);
1661 }
1662 if (atomic_read(&uadev[pcm_card_num].in_use))
1663 kref_put(&uadev[pcm_card_num].kref,
1664 uaudio_dev_release);
1665 mutex_unlock(&chip->mutex);
1666 }
1667 mutex_unlock(&qdev_mutex);
1668
1669 resp.usb_token = req_msg->usb_token;
1670 resp.usb_token_valid = 1;
1671 resp.internal_status = ret;
1672 resp.internal_status_valid = 1;
1673 resp.status = ret ? USB_QMI_STREAM_REQ_FAILURE_V01 : ret;
1674 resp.status_valid = 1;
1675 ret = qmi_send_response(svc->uaudio_svc_hdl, sq, txn,
1676 QMI_UAUDIO_STREAM_RESP_V01,
1677 QMI_UAUDIO_STREAM_RESP_MSG_V01_MAX_MSG_LEN,
1678 qmi_uaudio_stream_resp_msg_v01_ei, &resp);
1679 }
1680
1681 static struct qmi_msg_handler uaudio_stream_req_handlers = {
1682 .type = QMI_REQUEST,
1683 .msg_id = QMI_UAUDIO_STREAM_REQ_V01,
1684 .ei = qmi_uaudio_stream_req_msg_v01_ei,
1685 .decoded_size = QMI_UAUDIO_STREAM_REQ_MSG_V01_MAX_MSG_LEN,
1686 .fn = handle_uaudio_stream_req,
1687 };
1688
1689 /**
1690 * qc_usb_audio_offload_init_qmi_dev() - initializes qmi dev
1691 *
1692 * Initializes the USB qdev, which is used to carry information pertaining to
1693 * the offloading resources. This device is freed only when there are no longer
1694 * any offloading candidates. (i.e, when all audio devices are disconnected)
1695 *
1696 */
qc_usb_audio_offload_init_qmi_dev(void)1697 static int qc_usb_audio_offload_init_qmi_dev(void)
1698 {
1699 uaudio_qdev = kzalloc(sizeof(*uaudio_qdev), GFP_KERNEL);
1700 if (!uaudio_qdev)
1701 return -ENOMEM;
1702
1703 /* initialize xfer ring and xfer buf iova list */
1704 INIT_LIST_HEAD(&uaudio_qdev->xfer_ring_list);
1705 uaudio_qdev->curr_xfer_ring_iova = IOVA_XFER_RING_BASE;
1706 uaudio_qdev->xfer_ring_iova_size =
1707 IOVA_XFER_RING_MAX - IOVA_XFER_RING_BASE;
1708
1709 INIT_LIST_HEAD(&uaudio_qdev->xfer_buf_list);
1710 uaudio_qdev->curr_xfer_buf_iova = IOVA_XFER_BUF_BASE;
1711 uaudio_qdev->xfer_buf_iova_size =
1712 IOVA_XFER_BUF_MAX - IOVA_XFER_BUF_BASE;
1713
1714 return 0;
1715 }
1716
1717 /* 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)1718 static int qc_usb_audio_offload_fill_avail_pcms(struct snd_usb_audio *chip,
1719 struct snd_soc_usb_device *sdev)
1720 {
1721 struct snd_usb_stream *as;
1722 struct snd_usb_substream *subs;
1723 int idx = 0;
1724
1725 list_for_each_entry(as, &chip->pcm_list, list) {
1726 subs = &as->substream[SNDRV_PCM_STREAM_PLAYBACK];
1727 if (subs->ep_num) {
1728 sdev->ppcm_idx[idx] = as->pcm->device;
1729 idx++;
1730 }
1731 /*
1732 * Break if the current index exceeds the number of possible
1733 * playback streams counted from the UAC descriptors.
1734 */
1735 if (idx >= sdev->num_playback)
1736 break;
1737 }
1738
1739 return -1;
1740 }
1741
1742 /**
1743 * qc_usb_audio_offload_probe() - platform op connect handler
1744 * @chip: USB SND device
1745 *
1746 * Platform connect handler when a USB SND device is detected. Will
1747 * notify SOC USB about the connection to enable the USB ASoC backend
1748 * and populate internal USB chip array.
1749 *
1750 */
qc_usb_audio_offload_probe(struct snd_usb_audio * chip)1751 static void qc_usb_audio_offload_probe(struct snd_usb_audio *chip)
1752 {
1753 struct usb_interface *intf = chip->intf[chip->num_interfaces - 1];
1754 struct usb_interface_descriptor *altsd;
1755 struct usb_host_interface *alts;
1756 struct snd_soc_usb_device *sdev;
1757 struct xhci_sideband *sb;
1758
1759 /*
1760 * If there is no priv_data, or no playback paths, the connected
1761 * device doesn't support offloading. Avoid populating entries for
1762 * this device.
1763 */
1764 if (!snd_soc_usb_find_priv_data(uaudio_qdev->auxdev->dev.parent) ||
1765 !usb_qmi_get_pcm_num(chip, 0))
1766 return;
1767
1768 mutex_lock(&qdev_mutex);
1769 mutex_lock(&chip->mutex);
1770 if (!uadev[chip->card->number].chip) {
1771 sdev = kzalloc(sizeof(*sdev), GFP_KERNEL);
1772 if (!sdev)
1773 goto exit;
1774
1775 sb = xhci_sideband_register(intf, XHCI_SIDEBAND_VENDOR,
1776 uaudio_sideband_notifier);
1777 if (!sb)
1778 goto free_sdev;
1779 } else {
1780 sb = uadev[chip->card->number].sb;
1781 sdev = uadev[chip->card->number].sdev;
1782 }
1783
1784 uadev[chip->card->number].sb = sb;
1785 uadev[chip->card->number].chip = chip;
1786 uadev[chip->card->number].sdev = sdev;
1787
1788 alts = &intf->altsetting[0];
1789 altsd = get_iface_desc(alts);
1790
1791 /* Wait until all PCM devices are populated before notifying soc-usb */
1792 if (altsd->bInterfaceNumber == chip->last_iface) {
1793 sdev->num_playback = usb_qmi_get_pcm_num(chip, 0);
1794
1795 /*
1796 * Allocate playback pcm index array based on number of possible
1797 * playback paths within the UAC descriptors.
1798 */
1799 sdev->ppcm_idx = kcalloc(sdev->num_playback, sizeof(unsigned int),
1800 GFP_KERNEL);
1801 if (!sdev->ppcm_idx)
1802 goto unreg_xhci;
1803
1804 qc_usb_audio_offload_fill_avail_pcms(chip, sdev);
1805 sdev->card_idx = chip->card->number;
1806 sdev->chip_idx = chip->index;
1807
1808 snd_usb_offload_create_ctl(chip, uaudio_qdev->auxdev->dev.parent);
1809 snd_soc_usb_connect(uaudio_qdev->auxdev->dev.parent, sdev);
1810 }
1811
1812 mutex_unlock(&chip->mutex);
1813 mutex_unlock(&qdev_mutex);
1814
1815 return;
1816
1817 unreg_xhci:
1818 xhci_sideband_unregister(sb);
1819 uadev[chip->card->number].sb = NULL;
1820 free_sdev:
1821 kfree(sdev);
1822 uadev[chip->card->number].sdev = NULL;
1823 uadev[chip->card->number].chip = NULL;
1824 exit:
1825 mutex_unlock(&chip->mutex);
1826 mutex_unlock(&qdev_mutex);
1827 }
1828
1829 /**
1830 * qc_usb_audio_cleanup_qmi_dev() - release qmi device
1831 *
1832 * Frees the USB qdev. Only occurs when there are no longer any potential
1833 * devices that can utilize USB audio offloading.
1834 *
1835 */
qc_usb_audio_cleanup_qmi_dev(void)1836 static void qc_usb_audio_cleanup_qmi_dev(void)
1837 {
1838 kfree(uaudio_qdev);
1839 uaudio_qdev = NULL;
1840 }
1841
1842 /**
1843 * qc_usb_audio_offload_disconnect() - platform op disconnect handler
1844 * @chip: USB SND device
1845 *
1846 * Platform disconnect handler. Will ensure that any pending stream is
1847 * halted by issuing a QMI disconnect indication packet to the adsp.
1848 *
1849 */
qc_usb_audio_offload_disconnect(struct snd_usb_audio * chip)1850 static void qc_usb_audio_offload_disconnect(struct snd_usb_audio *chip)
1851 {
1852 struct uaudio_dev *dev;
1853 int card_num;
1854
1855 if (!chip)
1856 return;
1857
1858 card_num = chip->card->number;
1859 if (card_num >= SNDRV_CARDS)
1860 return;
1861
1862 mutex_lock(&qdev_mutex);
1863 mutex_lock(&chip->mutex);
1864 dev = &uadev[card_num];
1865
1866 /* Device has already been cleaned up, or never populated */
1867 if (!dev->chip) {
1868 mutex_unlock(&qdev_mutex);
1869 mutex_unlock(&chip->mutex);
1870 return;
1871 }
1872
1873 /* cleaned up already */
1874 if (!dev->udev)
1875 goto done;
1876
1877 uaudio_send_disconnect_ind(chip);
1878 uaudio_dev_cleanup(dev);
1879 done:
1880 /*
1881 * If num_interfaces == 1, the last USB SND interface is being removed.
1882 * This is to accommodate for devices w/ multiple UAC functions.
1883 */
1884 if (chip->num_interfaces == 1) {
1885 snd_soc_usb_disconnect(uaudio_qdev->auxdev->dev.parent, dev->sdev);
1886 xhci_sideband_unregister(dev->sb);
1887 dev->chip = NULL;
1888 kfree(dev->sdev->ppcm_idx);
1889 kfree(dev->sdev);
1890 dev->sdev = NULL;
1891 }
1892 mutex_unlock(&chip->mutex);
1893
1894 mutex_unlock(&qdev_mutex);
1895 }
1896
1897 /**
1898 * qc_usb_audio_offload_suspend() - USB offload PM suspend handler
1899 * @intf: USB interface
1900 * @message: suspend type
1901 *
1902 * PM suspend handler to ensure that the USB offloading driver is able to stop
1903 * any pending traffic, so that the bus can be suspended.
1904 *
1905 */
qc_usb_audio_offload_suspend(struct usb_interface * intf,pm_message_t message)1906 static void qc_usb_audio_offload_suspend(struct usb_interface *intf,
1907 pm_message_t message)
1908 {
1909 struct snd_usb_audio *chip = usb_get_intfdata(intf);
1910 int card_num;
1911
1912 if (!chip)
1913 return;
1914
1915 card_num = chip->card->number;
1916 if (card_num >= SNDRV_CARDS)
1917 return;
1918
1919 mutex_lock(&qdev_mutex);
1920 mutex_lock(&chip->mutex);
1921
1922 uaudio_send_disconnect_ind(chip);
1923
1924 mutex_unlock(&qdev_mutex);
1925 mutex_unlock(&chip->mutex);
1926 }
1927
1928 static struct snd_usb_platform_ops offload_ops = {
1929 .connect_cb = qc_usb_audio_offload_probe,
1930 .disconnect_cb = qc_usb_audio_offload_disconnect,
1931 .suspend_cb = qc_usb_audio_offload_suspend,
1932 };
1933
qc_usb_audio_probe(struct auxiliary_device * auxdev,const struct auxiliary_device_id * id)1934 static int qc_usb_audio_probe(struct auxiliary_device *auxdev,
1935 const struct auxiliary_device_id *id)
1936
1937 {
1938 struct uaudio_qmi_svc *svc;
1939 int ret;
1940
1941 svc = kzalloc(sizeof(*svc), GFP_KERNEL);
1942 if (!svc)
1943 return -ENOMEM;
1944
1945 svc->uaudio_svc_hdl = kzalloc(sizeof(*svc->uaudio_svc_hdl), GFP_KERNEL);
1946 if (!svc->uaudio_svc_hdl) {
1947 ret = -ENOMEM;
1948 goto free_svc;
1949 }
1950
1951 ret = qmi_handle_init(svc->uaudio_svc_hdl,
1952 QMI_UAUDIO_STREAM_REQ_MSG_V01_MAX_MSG_LEN,
1953 &uaudio_svc_ops_options,
1954 &uaudio_stream_req_handlers);
1955 ret = qmi_add_server(svc->uaudio_svc_hdl, UAUDIO_STREAM_SERVICE_ID_V01,
1956 UAUDIO_STREAM_SERVICE_VERS_V01, 0);
1957
1958 uaudio_svc = svc;
1959
1960 qc_usb_audio_offload_init_qmi_dev();
1961 uaudio_qdev->auxdev = auxdev;
1962
1963 ret = snd_usb_register_platform_ops(&offload_ops);
1964 if (ret < 0)
1965 goto release_qmi;
1966
1967 snd_usb_rediscover_devices();
1968
1969 return 0;
1970
1971 release_qmi:
1972 qc_usb_audio_cleanup_qmi_dev();
1973 qmi_handle_release(svc->uaudio_svc_hdl);
1974 free_svc:
1975 kfree(svc);
1976
1977 return ret;
1978 }
1979
qc_usb_audio_remove(struct auxiliary_device * auxdev)1980 static void qc_usb_audio_remove(struct auxiliary_device *auxdev)
1981 {
1982 struct uaudio_qmi_svc *svc = uaudio_svc;
1983 int idx;
1984
1985 /*
1986 * Remove all connected devices after unregistering ops, to ensure
1987 * that no further connect events will occur. The disconnect routine
1988 * will issue the QMI disconnect indication, which results in the
1989 * external DSP to stop issuing transfers.
1990 */
1991 snd_usb_unregister_platform_ops();
1992 for (idx = 0; idx < SNDRV_CARDS; idx++)
1993 qc_usb_audio_offload_disconnect(uadev[idx].chip);
1994
1995 qc_usb_audio_cleanup_qmi_dev();
1996
1997 qmi_handle_release(svc->uaudio_svc_hdl);
1998 kfree(svc);
1999 uaudio_svc = NULL;
2000 }
2001
2002 static const struct auxiliary_device_id qc_usb_audio_table[] = {
2003 { .name = "q6usb.qc-usb-audio-offload" },
2004 {},
2005 };
2006 MODULE_DEVICE_TABLE(auxiliary, qc_usb_audio_table);
2007
2008 static struct auxiliary_driver qc_usb_audio_offload_drv = {
2009 .name = "qc-usb-audio-offload",
2010 .id_table = qc_usb_audio_table,
2011 .probe = qc_usb_audio_probe,
2012 .remove = qc_usb_audio_remove,
2013 };
2014 module_auxiliary_driver(qc_usb_audio_offload_drv);
2015
2016 MODULE_DESCRIPTION("QC USB Audio Offloading");
2017 MODULE_LICENSE("GPL");
2018