1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
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_obj(*info);
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 int ret;
569
570 switch (mtype) {
571 case MEM_EVENT_RING:
572 iova = IOVA_BASE;
573 /* er already mapped */
574 if (uaudio_qdev->er_mapped)
575 map = false;
576 break;
577 case MEM_XFER_RING:
578 iova = uaudio_get_iova(&uaudio_qdev->curr_xfer_ring_iova,
579 &uaudio_qdev->xfer_ring_iova_size,
580 &uaudio_qdev->xfer_ring_list, size);
581 break;
582 default:
583 dev_err(uaudio_qdev->data->dev, "unknown mem type %d\n", mtype);
584 }
585
586 if (!iova)
587 return 0;
588
589 if (!map)
590 return iova;
591
592 ret = iommu_map(uaudio_qdev->data->domain, iova, pa, size, prot,
593 GFP_KERNEL);
594 if (ret) {
595 dev_err(uaudio_qdev->data->dev,
596 "failed to map %zu bytes at iova 0x%08lx: %d\n",
597 size, iova, ret);
598 if (mtype == MEM_XFER_RING)
599 uaudio_put_iova(iova, size,
600 &uaudio_qdev->xfer_ring_list,
601 &uaudio_qdev->xfer_ring_iova_size);
602 return 0;
603 }
604
605 return iova;
606 }
607
uaudio_iommu_map_xfer_buf(bool dma_coherent,size_t size,struct sg_table * sgt)608 static unsigned long uaudio_iommu_map_xfer_buf(bool dma_coherent, size_t size,
609 struct sg_table *sgt)
610 {
611 struct scatterlist *sg;
612 unsigned long iova = 0;
613 size_t total_len = 0;
614 unsigned long iova_sg;
615 phys_addr_t pa_sg;
616 size_t sg_len;
617 int prot = uaudio_iommu_map_prot(dma_coherent);
618 int ret;
619 int i;
620
621 prot = IOMMU_READ | IOMMU_WRITE;
622
623 if (dma_coherent)
624 prot |= IOMMU_CACHE;
625
626 iova = uaudio_get_iova(&uaudio_qdev->curr_xfer_buf_iova,
627 &uaudio_qdev->xfer_buf_iova_size,
628 &uaudio_qdev->xfer_buf_list, size);
629 if (!iova)
630 goto done;
631
632 iova_sg = iova;
633 for_each_sg(sgt->sgl, sg, sgt->nents, i) {
634 sg_len = PAGE_ALIGN(sg->offset + sg->length);
635 pa_sg = page_to_phys(sg_page(sg));
636 ret = iommu_map(uaudio_qdev->data->domain, iova_sg, pa_sg, sg_len,
637 prot, GFP_KERNEL);
638 if (ret) {
639 uaudio_iommu_unmap(MEM_XFER_BUF, iova, size, total_len);
640 iova = 0;
641 goto done;
642 }
643
644 iova_sg += sg_len;
645 total_len += sg_len;
646 }
647
648 if (size != total_len) {
649 uaudio_iommu_unmap(MEM_XFER_BUF, iova, size, total_len);
650 iova = 0;
651 }
652 done:
653 return iova;
654 }
655
656 /* looks up alias, if any, for controller DT node and returns the index */
usb_get_controller_id(struct usb_device * udev)657 static int usb_get_controller_id(struct usb_device *udev)
658 {
659 if (udev->bus->sysdev && udev->bus->sysdev->of_node)
660 return of_alias_get_id(udev->bus->sysdev->of_node, "usb");
661
662 return -ENODEV;
663 }
664
665 /**
666 * uaudio_dev_intf_cleanup() - cleanup transfer resources
667 * @udev: usb device
668 * @info: usb offloading interface
669 *
670 * Cleans up the transfer ring related resources which are assigned per
671 * endpoint from XHCI. This is invoked when the USB endpoints are no
672 * longer in use by the adsp.
673 *
674 */
uaudio_dev_intf_cleanup(struct usb_device * udev,struct intf_info * info)675 static void uaudio_dev_intf_cleanup(struct usb_device *udev, struct intf_info *info)
676 {
677 uaudio_iommu_unmap(MEM_XFER_RING, info->data_xfer_ring_va,
678 info->data_xfer_ring_size, info->data_xfer_ring_size);
679 info->data_xfer_ring_va = 0;
680 info->data_xfer_ring_size = 0;
681
682 uaudio_iommu_unmap(MEM_XFER_RING, info->sync_xfer_ring_va,
683 info->sync_xfer_ring_size, info->sync_xfer_ring_size);
684 info->sync_xfer_ring_va = 0;
685 info->sync_xfer_ring_size = 0;
686
687 uaudio_iommu_unmap(MEM_XFER_BUF, info->xfer_buf_iova, info->xfer_buf_size,
688 info->xfer_buf_size);
689 info->xfer_buf_iova = 0;
690
691 usb_free_coherent(udev, info->xfer_buf_size, info->xfer_buf_cpu,
692 info->xfer_buf_dma);
693 info->xfer_buf_size = 0;
694 info->xfer_buf_cpu = NULL;
695 info->xfer_buf_dma = 0;
696
697 info->in_use = false;
698 }
699
700 /**
701 * uaudio_event_ring_cleanup_free() - cleanup secondary event ring
702 * @dev: usb offload device
703 *
704 * Cleans up the secondary event ring that was requested. This will
705 * occur when the adsp is no longer transferring data on the USB bus
706 * across all endpoints.
707 *
708 */
uaudio_event_ring_cleanup_free(struct uaudio_dev * dev)709 static void uaudio_event_ring_cleanup_free(struct uaudio_dev *dev)
710 {
711 clear_bit(dev->chip->card->number, &uaudio_qdev->card_slot);
712 /* all audio devices are disconnected */
713 if (!uaudio_qdev->card_slot) {
714 uaudio_iommu_unmap(MEM_EVENT_RING, IOVA_BASE, PAGE_SIZE,
715 PAGE_SIZE);
716 xhci_sideband_remove_interrupter(uadev[dev->chip->card->number].sb);
717 usb_offload_put(dev->udev);
718 }
719 }
720
uaudio_dev_cleanup(struct uaudio_dev * dev)721 static void uaudio_dev_cleanup(struct uaudio_dev *dev)
722 {
723 int if_idx;
724
725 if (!dev->udev)
726 return;
727
728 /* free xfer buffer and unmap xfer ring and buf per interface */
729 for (if_idx = 0; if_idx < dev->num_intf; if_idx++) {
730 if (!dev->info[if_idx].in_use)
731 continue;
732 uaudio_dev_intf_cleanup(dev->udev, &dev->info[if_idx]);
733 dev_dbg(uaudio_qdev->data->dev,
734 "release resources: intf# %d card# %d\n",
735 dev->info[if_idx].intf_num, dev->chip->card->number);
736 }
737
738 dev->num_intf = 0;
739
740 /* free interface info */
741 kfree(dev->info);
742 dev->info = NULL;
743 uaudio_event_ring_cleanup_free(dev);
744 dev->udev = NULL;
745 }
746
747 /**
748 * disable_audio_stream() - disable usb snd endpoints
749 * @subs: usb substream
750 *
751 * Closes the USB SND endpoints associated with the current audio stream
752 * used. This will decrement the USB SND endpoint opened reference count.
753 *
754 */
disable_audio_stream(struct snd_usb_substream * subs)755 static void disable_audio_stream(struct snd_usb_substream *subs)
756 {
757 struct snd_usb_audio *chip = subs->stream->chip;
758
759 snd_usb_hw_free(subs);
760 snd_usb_autosuspend(chip);
761 }
762
763 /* QMI service disconnect handlers */
qmi_stop_session(void)764 static void qmi_stop_session(void)
765 {
766 struct snd_usb_substream *subs;
767 struct usb_host_endpoint *ep;
768 struct snd_usb_audio *chip;
769 struct intf_info *info;
770 int pcm_card_num;
771 int if_idx;
772 int idx;
773
774 guard(mutex)(&qdev_mutex);
775 /* find all active intf for set alt 0 and cleanup usb audio dev */
776 for (idx = 0; idx < SNDRV_CARDS; idx++) {
777 if (!atomic_read(&uadev[idx].in_use))
778 continue;
779
780 chip = uadev[idx].chip;
781 for (if_idx = 0; if_idx < uadev[idx].num_intf; if_idx++) {
782 if (!uadev[idx].info || !uadev[idx].info[if_idx].in_use)
783 continue;
784 info = &uadev[idx].info[if_idx];
785 pcm_card_num = info->pcm_card_num;
786 subs = find_substream(pcm_card_num, info->pcm_dev_num,
787 info->direction);
788 if (!subs || !chip || atomic_read(&chip->shutdown)) {
789 dev_err(&uadev[idx].udev->dev,
790 "no sub for c#%u dev#%u dir%u\n",
791 info->pcm_card_num,
792 info->pcm_dev_num,
793 info->direction);
794 continue;
795 }
796 /* Release XHCI endpoints */
797 if (info->data_ep_pipe)
798 ep = usb_pipe_endpoint(uadev[pcm_card_num].udev,
799 info->data_ep_pipe);
800 xhci_sideband_remove_endpoint(uadev[pcm_card_num].sb, ep);
801
802 if (info->sync_ep_pipe)
803 ep = usb_pipe_endpoint(uadev[pcm_card_num].udev,
804 info->sync_ep_pipe);
805 xhci_sideband_remove_endpoint(uadev[pcm_card_num].sb, ep);
806
807 disable_audio_stream(subs);
808 }
809 atomic_set(&uadev[idx].in_use, 0);
810 guard(mutex)(&chip->mutex);
811 uaudio_dev_cleanup(&uadev[idx]);
812 }
813 }
814
815 /**
816 * uaudio_sideband_notifier() - xHCI sideband event handler
817 * @intf: USB interface handle
818 * @evt: xHCI sideband event type
819 *
820 * This callback is executed when the xHCI sideband encounters a sequence
821 * that requires the sideband clients to take action. An example, is when
822 * xHCI frees the transfer ring, so the client has to ensure that the
823 * offload path is halted.
824 *
825 */
uaudio_sideband_notifier(struct usb_interface * intf,struct xhci_sideband_event * evt)826 static int uaudio_sideband_notifier(struct usb_interface *intf,
827 struct xhci_sideband_event *evt)
828 {
829 struct snd_usb_audio *chip;
830 struct uaudio_dev *dev;
831 int if_idx;
832
833 if (!intf || !evt)
834 return 0;
835
836 chip = usb_get_intfdata(intf);
837
838 guard(mutex)(&qdev_mutex);
839 guard(mutex)(&chip->mutex);
840
841 dev = &uadev[chip->card->number];
842
843 if (evt->type == XHCI_SIDEBAND_XFER_RING_FREE) {
844 unsigned int *ep = (unsigned int *) evt->evt_data;
845
846 for (if_idx = 0; if_idx < dev->num_intf; if_idx++) {
847 if (dev->info[if_idx].data_ep_idx == *ep ||
848 dev->info[if_idx].sync_ep_idx == *ep)
849 uaudio_send_disconnect_ind(chip);
850 }
851 }
852
853 return 0;
854 }
855
856 /**
857 * qmi_bye_cb() - qmi bye message callback
858 * @handle: QMI handle
859 * @node: id of the dying node
860 *
861 * This callback is invoked when the QMI bye control message is received
862 * from the QMI client. Handle the message accordingly by ensuring that
863 * the USB offload path is disabled and cleaned up. At this point, ADSP
864 * is not utilizing the USB bus.
865 *
866 */
qmi_bye_cb(struct qmi_handle * handle,unsigned int node)867 static void qmi_bye_cb(struct qmi_handle *handle, unsigned int node)
868 {
869 struct uaudio_qmi_svc *svc = uaudio_svc;
870
871 if (svc->uaudio_svc_hdl != handle)
872 return;
873
874 if (svc->client_connected && svc->client_sq.sq_node == node) {
875 qmi_stop_session();
876
877 /* clear QMI client parameters to block further QMI messages */
878 svc->client_sq.sq_node = 0;
879 svc->client_sq.sq_port = 0;
880 svc->client_sq.sq_family = 0;
881 svc->client_connected = false;
882 }
883 }
884
885 /**
886 * qmi_svc_disconnect_cb() - qmi client disconnected
887 * @handle: QMI handle
888 * @node: id of the dying node
889 * @port: port of the dying client
890 *
891 * Invoked when the remote QMI client is disconnected. Handle this event
892 * the same way as when the QMI bye message is received. This will ensure
893 * the USB offloading path is disabled and cleaned up.
894 *
895 */
qmi_svc_disconnect_cb(struct qmi_handle * handle,unsigned int node,unsigned int port)896 static void qmi_svc_disconnect_cb(struct qmi_handle *handle,
897 unsigned int node, unsigned int port)
898 {
899 struct uaudio_qmi_svc *svc;
900
901 if (!uaudio_svc)
902 return;
903
904 svc = uaudio_svc;
905 if (svc->uaudio_svc_hdl != handle)
906 return;
907
908 if (svc->client_connected && svc->client_sq.sq_node == node &&
909 svc->client_sq.sq_port == port) {
910 qmi_stop_session();
911
912 /* clear QMI client parameters to block further QMI messages */
913 svc->client_sq.sq_node = 0;
914 svc->client_sq.sq_port = 0;
915 svc->client_sq.sq_family = 0;
916 svc->client_connected = false;
917 }
918 }
919
920 /* QMI client callback handlers from QMI interface */
921 static struct qmi_ops uaudio_svc_ops_options = {
922 .bye = qmi_bye_cb,
923 .del_client = qmi_svc_disconnect_cb,
924 };
925
926 /* kref release callback when all streams are disabled */
uaudio_dev_release(struct kref * kref)927 static void uaudio_dev_release(struct kref *kref)
928 {
929 struct uaudio_dev *dev = container_of(kref, struct uaudio_dev, kref);
930
931 uaudio_event_ring_cleanup_free(dev);
932 atomic_set(&dev->in_use, 0);
933 wake_up(&dev->disconnect_wq);
934 }
935
936 /**
937 * enable_audio_stream() - enable usb snd endpoints
938 * @subs: usb substream
939 * @pcm_format: pcm format requested
940 * @channels: number of channels
941 * @cur_rate: sample rate
942 * @datainterval: interval
943 *
944 * Opens all USB SND endpoints used for the data interface. This will increment
945 * the USB SND endpoint's opened count. Requests to keep the interface resumed
946 * until the audio stream is stopped. Will issue the USB set interface control
947 * message to enable the data interface.
948 *
949 */
enable_audio_stream(struct snd_usb_substream * subs,snd_pcm_format_t pcm_format,unsigned int channels,unsigned int cur_rate,int datainterval)950 static int enable_audio_stream(struct snd_usb_substream *subs,
951 snd_pcm_format_t pcm_format,
952 unsigned int channels, unsigned int cur_rate,
953 int datainterval)
954 {
955 struct snd_pcm_hw_params params;
956 struct snd_usb_audio *chip;
957 struct snd_interval *i;
958 struct snd_mask *m;
959 int ret;
960
961 chip = subs->stream->chip;
962
963 _snd_pcm_hw_params_any(¶ms);
964
965 m = hw_param_mask(¶ms, SNDRV_PCM_HW_PARAM_FORMAT);
966 snd_mask_leave(m, (__force unsigned int)pcm_format);
967
968 i = hw_param_interval(¶ms, SNDRV_PCM_HW_PARAM_CHANNELS);
969 snd_interval_setinteger(i);
970 i->min = channels;
971 i->max = channels;
972
973 i = hw_param_interval(¶ms, SNDRV_PCM_HW_PARAM_RATE);
974 snd_interval_setinteger(i);
975 i->min = cur_rate;
976 i->max = cur_rate;
977
978 pm_runtime_barrier(&chip->intf[0]->dev);
979 snd_usb_autoresume(chip);
980
981 ret = snd_usb_hw_params(subs, ¶ms);
982 if (ret < 0)
983 goto put_suspend;
984
985 if (!atomic_read(&chip->shutdown)) {
986 CLASS(snd_usb_lock, pm)(chip);
987 if (pm.err < 0) {
988 ret = pm.err;
989 goto detach_ep;
990 }
991
992 if (subs->sync_endpoint) {
993 ret = snd_usb_endpoint_prepare(chip, subs->sync_endpoint);
994 if (ret < 0)
995 goto detach_ep;
996 }
997
998 ret = snd_usb_endpoint_prepare(chip, subs->data_endpoint);
999 if (ret < 0)
1000 goto detach_ep;
1001
1002 dev_dbg(uaudio_qdev->data->dev,
1003 "selected %s iface:%d altsetting:%d datainterval:%dus\n",
1004 subs->direction ? "capture" : "playback",
1005 subs->cur_audiofmt->iface, subs->cur_audiofmt->altsetting,
1006 (1 << subs->cur_audiofmt->datainterval) *
1007 (subs->dev->speed >= USB_SPEED_HIGH ?
1008 BUS_INTERVAL_HIGHSPEED_AND_ABOVE :
1009 BUS_INTERVAL_FULL_SPEED));
1010 }
1011
1012 return 0;
1013
1014 detach_ep:
1015 snd_usb_hw_free(subs);
1016
1017 put_suspend:
1018 snd_usb_autosuspend(chip);
1019
1020 return ret;
1021 }
1022
1023 /**
1024 * uaudio_transfer_buffer_setup() - fetch and populate xfer buffer params
1025 * @subs: usb substream
1026 * @xfer_buf_cpu: xfer buf to be allocated
1027 * @xfer_buf_len: size of allocation
1028 * @mem_info: QMI response info
1029 *
1030 * Allocates and maps the transfer buffers that will be utilized by the
1031 * audio DSP. Will populate the information in the QMI response that is
1032 * sent back to the stream enable request.
1033 *
1034 */
uaudio_transfer_buffer_setup(struct snd_usb_substream * subs,void ** xfer_buf_cpu,u32 xfer_buf_len,struct mem_info_v01 * mem_info)1035 static int uaudio_transfer_buffer_setup(struct snd_usb_substream *subs,
1036 void **xfer_buf_cpu, u32 xfer_buf_len,
1037 struct mem_info_v01 *mem_info)
1038 {
1039 struct sg_table xfer_buf_sgt;
1040 dma_addr_t xfer_buf_dma;
1041 void *xfer_buf;
1042 u32 len = xfer_buf_len;
1043 bool dma_coherent;
1044 dma_addr_t xfer_buf_dma_sysdev;
1045 u32 remainder;
1046 u32 mult;
1047 int ret;
1048
1049 dma_coherent = dev_is_dma_coherent(subs->dev->bus->sysdev);
1050
1051 /* xfer buffer, multiple of 4K only */
1052 if (!len)
1053 len = PAGE_SIZE;
1054
1055 mult = len / PAGE_SIZE;
1056 remainder = len % PAGE_SIZE;
1057 len = mult * PAGE_SIZE;
1058 len += remainder ? PAGE_SIZE : 0;
1059
1060 if (len > MAX_XFER_BUFF_LEN) {
1061 dev_err(uaudio_qdev->data->dev,
1062 "req buf len %d > max buf len %lu, setting %lu\n",
1063 len, MAX_XFER_BUFF_LEN, MAX_XFER_BUFF_LEN);
1064 len = MAX_XFER_BUFF_LEN;
1065 }
1066
1067 /* get buffer mapped into subs->dev */
1068 xfer_buf = usb_alloc_coherent(subs->dev, len, GFP_KERNEL, &xfer_buf_dma);
1069 if (!xfer_buf)
1070 return -ENOMEM;
1071
1072 ret = dma_get_sgtable(subs->dev->bus->sysdev, &xfer_buf_sgt, xfer_buf,
1073 xfer_buf_dma, len);
1074 if (ret)
1075 goto free_xfer_buf;
1076
1077 /* map the physical buffer into sysdev as well */
1078 xfer_buf_dma_sysdev = uaudio_iommu_map_xfer_buf(dma_coherent,
1079 len, &xfer_buf_sgt);
1080 if (!xfer_buf_dma_sysdev) {
1081 ret = -ENOMEM;
1082 goto free_sgt;
1083 }
1084
1085 mem_info->dma = xfer_buf_dma;
1086 mem_info->size = len;
1087 mem_info->iova = PREPEND_SID_TO_IOVA(xfer_buf_dma_sysdev, uaudio_qdev->data->sid);
1088 *xfer_buf_cpu = xfer_buf;
1089 sg_free_table(&xfer_buf_sgt);
1090
1091 return 0;
1092
1093 free_sgt:
1094 sg_free_table(&xfer_buf_sgt);
1095 free_xfer_buf:
1096 usb_free_coherent(subs->dev, len, xfer_buf, xfer_buf_dma);
1097
1098 return ret;
1099 }
1100
1101 /**
1102 * uaudio_endpoint_setup() - fetch and populate endpoint params
1103 * @subs: usb substream
1104 * @endpoint: usb endpoint to add
1105 * @card_num: uadev index
1106 * @mem_info: QMI response info
1107 * @ep_desc: QMI ep desc response field
1108 *
1109 * Initialize the USB endpoint being used for a particular USB
1110 * stream. Will request XHCI sec intr to reserve the EP for
1111 * offloading as well as populating the QMI response with the
1112 * transfer ring parameters.
1113 *
1114 */
1115 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)1116 uaudio_endpoint_setup(struct snd_usb_substream *subs,
1117 struct snd_usb_endpoint *endpoint, int card_num,
1118 struct mem_info_v01 *mem_info,
1119 struct usb_endpoint_descriptor_v01 *ep_desc)
1120 {
1121 struct usb_host_endpoint *ep;
1122 phys_addr_t tr_pa = 0;
1123 struct sg_table *sgt;
1124 bool dma_coherent;
1125 unsigned long iova;
1126 struct page *pg;
1127 int ret = -ENODEV;
1128
1129 dma_coherent = dev_is_dma_coherent(subs->dev->bus->sysdev);
1130
1131 ep = usb_pipe_endpoint(subs->dev, endpoint->pipe);
1132 if (!ep) {
1133 dev_err(uaudio_qdev->data->dev, "data ep # %d context is null\n",
1134 subs->data_endpoint->ep_num);
1135 goto exit;
1136 }
1137
1138 memcpy(ep_desc, &ep->desc, sizeof(ep->desc));
1139
1140 ret = xhci_sideband_add_endpoint(uadev[card_num].sb, ep);
1141 if (ret < 0) {
1142 dev_err(&subs->dev->dev,
1143 "failed to add data ep to sec intr\n");
1144 ret = -ENODEV;
1145 goto exit;
1146 }
1147
1148 sgt = xhci_sideband_get_endpoint_buffer(uadev[card_num].sb, ep);
1149 if (!sgt) {
1150 dev_err(&subs->dev->dev,
1151 "failed to get data ep ring address\n");
1152 ret = -ENODEV;
1153 goto remove_ep;
1154 }
1155
1156 pg = sg_page(sgt->sgl);
1157 tr_pa = page_to_phys(pg);
1158 mem_info->dma = sg_dma_address(sgt->sgl);
1159 sg_free_table(sgt);
1160
1161 /* data transfer ring */
1162 iova = uaudio_iommu_map_pa(MEM_XFER_RING, dma_coherent, tr_pa,
1163 PAGE_SIZE);
1164 if (!iova) {
1165 ret = -ENOMEM;
1166 goto clear_pa;
1167 }
1168
1169 mem_info->iova = PREPEND_SID_TO_IOVA(iova, uaudio_qdev->data->sid);
1170 mem_info->size = PAGE_SIZE;
1171
1172 return 0;
1173
1174 clear_pa:
1175 mem_info->dma = 0;
1176 remove_ep:
1177 xhci_sideband_remove_endpoint(uadev[card_num].sb, ep);
1178 exit:
1179 return ret;
1180 }
1181
1182 /**
1183 * uaudio_event_ring_setup() - fetch and populate event ring params
1184 * @subs: usb substream
1185 * @card_num: uadev index
1186 * @mem_info: QMI response info
1187 *
1188 * Register secondary interrupter to XHCI and fetch the event buffer info
1189 * and populate the information into the QMI response.
1190 *
1191 */
uaudio_event_ring_setup(struct snd_usb_substream * subs,int card_num,struct mem_info_v01 * mem_info)1192 static int uaudio_event_ring_setup(struct snd_usb_substream *subs,
1193 int card_num, struct mem_info_v01 *mem_info)
1194 {
1195 struct sg_table *sgt;
1196 phys_addr_t er_pa;
1197 bool dma_coherent;
1198 unsigned long iova;
1199 struct page *pg;
1200 int ret;
1201
1202 dma_coherent = dev_is_dma_coherent(subs->dev->bus->sysdev);
1203 er_pa = 0;
1204
1205 ret = usb_offload_get(subs->dev);
1206 if (ret < 0)
1207 goto exit;
1208
1209 /* event ring */
1210 ret = xhci_sideband_create_interrupter(uadev[card_num].sb, 1, false,
1211 0, uaudio_qdev->data->intr_num);
1212 if (ret < 0) {
1213 dev_err(&subs->dev->dev, "failed to fetch interrupter\n");
1214 goto put_offload;
1215 }
1216
1217 sgt = xhci_sideband_get_event_buffer(uadev[card_num].sb);
1218 if (!sgt) {
1219 dev_err(&subs->dev->dev,
1220 "failed to get event ring address\n");
1221 ret = -ENODEV;
1222 goto remove_interrupter;
1223 }
1224
1225 pg = sg_page(sgt->sgl);
1226 er_pa = page_to_phys(pg);
1227 mem_info->dma = sg_dma_address(sgt->sgl);
1228 sg_free_table(sgt);
1229
1230 iova = uaudio_iommu_map_pa(MEM_EVENT_RING, dma_coherent, er_pa,
1231 PAGE_SIZE);
1232 if (!iova) {
1233 ret = -ENOMEM;
1234 goto clear_pa;
1235 }
1236
1237 mem_info->iova = PREPEND_SID_TO_IOVA(iova, uaudio_qdev->data->sid);
1238 mem_info->size = PAGE_SIZE;
1239
1240 return 0;
1241
1242 clear_pa:
1243 mem_info->dma = 0;
1244 remove_interrupter:
1245 xhci_sideband_remove_interrupter(uadev[card_num].sb);
1246 put_offload:
1247 usb_offload_put(subs->dev);
1248 exit:
1249 return ret;
1250 }
1251
1252 /**
1253 * uaudio_populate_uac_desc() - parse UAC parameters and populate QMI resp
1254 * @subs: usb substream
1255 * @resp: QMI response buffer
1256 *
1257 * Parses information specified within UAC descriptors which explain the
1258 * sample parameters that the device expects. This information is populated
1259 * to the QMI response sent back to the audio DSP.
1260 *
1261 */
uaudio_populate_uac_desc(struct snd_usb_substream * subs,struct qmi_uaudio_stream_resp_msg_v01 * resp)1262 static int uaudio_populate_uac_desc(struct snd_usb_substream *subs,
1263 struct qmi_uaudio_stream_resp_msg_v01 *resp)
1264 {
1265 struct usb_interface_descriptor *altsd;
1266 struct usb_host_interface *alts;
1267 struct usb_interface *iface;
1268 int protocol;
1269
1270 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
1271 if (!iface) {
1272 dev_err(&subs->dev->dev, "interface # %d does not exist\n",
1273 subs->cur_audiofmt->iface);
1274 return -ENODEV;
1275 }
1276
1277 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
1278 altsd = get_iface_desc(alts);
1279 protocol = altsd->bInterfaceProtocol;
1280
1281 if (protocol == UAC_VERSION_1) {
1282 struct uac1_as_header_descriptor *as;
1283
1284 as = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL,
1285 UAC_AS_GENERAL);
1286 if (!as) {
1287 dev_err(&subs->dev->dev,
1288 "%u:%d : no UAC_AS_GENERAL desc\n",
1289 subs->cur_audiofmt->iface,
1290 subs->cur_audiofmt->altset_idx);
1291 return -ENODEV;
1292 }
1293
1294 resp->data_path_delay = as->bDelay;
1295 resp->data_path_delay_valid = 1;
1296
1297 resp->usb_audio_subslot_size = subs->cur_audiofmt->fmt_sz;
1298 resp->usb_audio_subslot_size_valid = 1;
1299
1300 resp->usb_audio_spec_revision = le16_to_cpu((__force __le16)0x0100);
1301 resp->usb_audio_spec_revision_valid = 1;
1302 } else if (protocol == UAC_VERSION_2) {
1303 resp->usb_audio_subslot_size = subs->cur_audiofmt->fmt_sz;
1304 resp->usb_audio_subslot_size_valid = 1;
1305
1306 resp->usb_audio_spec_revision = le16_to_cpu((__force __le16)0x0200);
1307 resp->usb_audio_spec_revision_valid = 1;
1308 } else if (protocol == UAC_VERSION_3) {
1309 if (iface->intf_assoc->bFunctionSubClass ==
1310 UAC3_FUNCTION_SUBCLASS_FULL_ADC_3_0) {
1311 dev_err(&subs->dev->dev,
1312 "full adc is not supported\n");
1313 return -EINVAL;
1314 }
1315
1316 switch (le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize)) {
1317 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_16:
1318 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_16:
1319 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_16:
1320 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_16: {
1321 resp->usb_audio_subslot_size = 0x2;
1322 break;
1323 }
1324
1325 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_24:
1326 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_24:
1327 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_24:
1328 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_24: {
1329 resp->usb_audio_subslot_size = 0x3;
1330 break;
1331 }
1332
1333 default:
1334 dev_err(&subs->dev->dev,
1335 "%d: %u: Invalid wMaxPacketSize\n",
1336 subs->cur_audiofmt->iface,
1337 subs->cur_audiofmt->altset_idx);
1338 return -EINVAL;
1339 }
1340 resp->usb_audio_subslot_size_valid = 1;
1341 } else {
1342 dev_err(&subs->dev->dev, "unknown protocol version %x\n",
1343 protocol);
1344 return -ENODEV;
1345 }
1346
1347 memcpy(&resp->std_as_opr_intf_desc, &alts->desc, sizeof(alts->desc));
1348
1349 return 0;
1350 }
1351
1352 /**
1353 * prepare_qmi_response() - prepare stream enable response
1354 * @subs: usb substream
1355 * @req_msg: QMI request message
1356 * @resp: QMI response buffer
1357 * @info_idx: usb interface array index
1358 *
1359 * Prepares the QMI response for a USB QMI stream enable request. Will parse
1360 * out the parameters within the stream enable request, in order to match
1361 * requested audio profile to the ones exposed by the USB device connected.
1362 *
1363 * In addition, will fetch the XHCI transfer resources needed for the handoff to
1364 * happen. This includes, transfer ring and buffer addresses and secondary event
1365 * ring address. These parameters will be communicated as part of the USB QMI
1366 * stream enable response.
1367 *
1368 */
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)1369 static int prepare_qmi_response(struct snd_usb_substream *subs,
1370 struct qmi_uaudio_stream_req_msg_v01 *req_msg,
1371 struct qmi_uaudio_stream_resp_msg_v01 *resp,
1372 int info_idx)
1373 {
1374 struct q6usb_offload *data;
1375 int pcm_dev_num;
1376 int card_num;
1377 void *xfer_buf_cpu;
1378 int ret;
1379
1380 pcm_dev_num = (req_msg->usb_token & QMI_STREAM_REQ_DEV_NUM_MASK) >> 8;
1381 card_num = (req_msg->usb_token & QMI_STREAM_REQ_CARD_NUM_MASK) >> 16;
1382
1383 if (!uadev[card_num].ctrl_intf) {
1384 dev_err(&subs->dev->dev, "audio ctrl intf info not cached\n");
1385 return -ENODEV;
1386 }
1387
1388 ret = uaudio_populate_uac_desc(subs, resp);
1389 if (ret < 0)
1390 return ret;
1391
1392 resp->slot_id = subs->dev->slot_id;
1393 resp->slot_id_valid = 1;
1394
1395 data = snd_soc_usb_find_priv_data(uaudio_qdev->auxdev->dev.parent);
1396 if (!data) {
1397 dev_err(&subs->dev->dev, "No private data found\n");
1398 return -ENODEV;
1399 }
1400
1401 uaudio_qdev->data = data;
1402
1403 resp->std_as_opr_intf_desc_valid = 1;
1404 ret = uaudio_endpoint_setup(subs, subs->data_endpoint, card_num,
1405 &resp->xhci_mem_info.tr_data,
1406 &resp->std_as_data_ep_desc);
1407 if (ret < 0)
1408 return ret;
1409
1410 resp->std_as_data_ep_desc_valid = 1;
1411
1412 if (subs->sync_endpoint) {
1413 ret = uaudio_endpoint_setup(subs, subs->sync_endpoint, card_num,
1414 &resp->xhci_mem_info.tr_sync,
1415 &resp->std_as_sync_ep_desc);
1416 if (ret < 0)
1417 goto drop_data_ep;
1418
1419 resp->std_as_sync_ep_desc_valid = 1;
1420 }
1421
1422 resp->interrupter_num_valid = 1;
1423 resp->controller_num_valid = 0;
1424 ret = usb_get_controller_id(subs->dev);
1425 if (ret >= 0) {
1426 resp->controller_num = ret;
1427 resp->controller_num_valid = 1;
1428 }
1429
1430 /* event ring */
1431 ret = uaudio_event_ring_setup(subs, card_num,
1432 &resp->xhci_mem_info.evt_ring);
1433 if (ret < 0)
1434 goto drop_sync_ep;
1435
1436 uaudio_qdev->er_mapped = true;
1437 resp->interrupter_num = xhci_sideband_interrupter_id(uadev[card_num].sb);
1438
1439 resp->speed_info = get_speed_info(subs->dev->speed);
1440 if (resp->speed_info == USB_QMI_DEVICE_SPEED_INVALID_V01) {
1441 ret = -ENODEV;
1442 goto free_sec_ring;
1443 }
1444
1445 resp->speed_info_valid = 1;
1446
1447 ret = uaudio_transfer_buffer_setup(subs, &xfer_buf_cpu, req_msg->xfer_buff_size,
1448 &resp->xhci_mem_info.xfer_buff);
1449 if (ret < 0) {
1450 ret = -ENOMEM;
1451 goto free_sec_ring;
1452 }
1453
1454 resp->xhci_mem_info_valid = 1;
1455
1456 if (!atomic_read(&uadev[card_num].in_use)) {
1457 kref_init(&uadev[card_num].kref);
1458 init_waitqueue_head(&uadev[card_num].disconnect_wq);
1459 uadev[card_num].num_intf =
1460 subs->dev->config->desc.bNumInterfaces;
1461 uadev[card_num].info = kzalloc_objs(struct intf_info,
1462 uadev[card_num].num_intf);
1463 if (!uadev[card_num].info) {
1464 ret = -ENOMEM;
1465 goto unmap_er;
1466 }
1467 uadev[card_num].udev = subs->dev;
1468 atomic_set(&uadev[card_num].in_use, 1);
1469 } else {
1470 kref_get(&uadev[card_num].kref);
1471 }
1472
1473 uadev[card_num].usb_core_id = resp->controller_num;
1474
1475 /* cache intf specific info to use it for unmap and free xfer buf */
1476 uadev[card_num].info[info_idx].data_xfer_ring_va =
1477 IOVA_MASK(resp->xhci_mem_info.tr_data.iova);
1478 uadev[card_num].info[info_idx].data_xfer_ring_size = PAGE_SIZE;
1479 uadev[card_num].info[info_idx].sync_xfer_ring_va =
1480 IOVA_MASK(resp->xhci_mem_info.tr_sync.iova);
1481 uadev[card_num].info[info_idx].sync_xfer_ring_size = PAGE_SIZE;
1482 uadev[card_num].info[info_idx].xfer_buf_iova =
1483 IOVA_MASK(resp->xhci_mem_info.xfer_buff.iova);
1484 uadev[card_num].info[info_idx].xfer_buf_dma =
1485 resp->xhci_mem_info.xfer_buff.dma;
1486 uadev[card_num].info[info_idx].xfer_buf_size =
1487 resp->xhci_mem_info.xfer_buff.size;
1488 uadev[card_num].info[info_idx].data_ep_pipe = subs->data_endpoint ?
1489 subs->data_endpoint->pipe : 0;
1490 uadev[card_num].info[info_idx].sync_ep_pipe = subs->sync_endpoint ?
1491 subs->sync_endpoint->pipe : 0;
1492 uadev[card_num].info[info_idx].data_ep_idx = subs->data_endpoint ?
1493 subs->data_endpoint->ep_num : 0;
1494 uadev[card_num].info[info_idx].sync_ep_idx = subs->sync_endpoint ?
1495 subs->sync_endpoint->ep_num : 0;
1496 uadev[card_num].info[info_idx].xfer_buf_cpu = xfer_buf_cpu;
1497 uadev[card_num].info[info_idx].pcm_card_num = card_num;
1498 uadev[card_num].info[info_idx].pcm_dev_num = pcm_dev_num;
1499 uadev[card_num].info[info_idx].direction = subs->direction;
1500 uadev[card_num].info[info_idx].intf_num = subs->cur_audiofmt->iface;
1501 uadev[card_num].info[info_idx].in_use = true;
1502
1503 set_bit(card_num, &uaudio_qdev->card_slot);
1504
1505 return 0;
1506
1507 unmap_er:
1508 uaudio_iommu_unmap(MEM_EVENT_RING, IOVA_BASE, PAGE_SIZE, PAGE_SIZE);
1509 free_sec_ring:
1510 xhci_sideband_remove_interrupter(uadev[card_num].sb);
1511 usb_offload_put(subs->dev);
1512 drop_sync_ep:
1513 if (subs->sync_endpoint) {
1514 uaudio_iommu_unmap(MEM_XFER_RING,
1515 IOVA_MASK(resp->xhci_mem_info.tr_sync.iova),
1516 PAGE_SIZE, PAGE_SIZE);
1517 xhci_sideband_remove_endpoint(uadev[card_num].sb,
1518 usb_pipe_endpoint(subs->dev, subs->sync_endpoint->pipe));
1519 }
1520 drop_data_ep:
1521 uaudio_iommu_unmap(MEM_XFER_RING, IOVA_MASK(resp->xhci_mem_info.tr_data.iova),
1522 PAGE_SIZE, PAGE_SIZE);
1523 xhci_sideband_remove_endpoint(uadev[card_num].sb,
1524 usb_pipe_endpoint(subs->dev, subs->data_endpoint->pipe));
1525
1526 return ret;
1527 }
1528
1529 /**
1530 * handle_uaudio_stream_req() - handle stream enable/disable request
1531 * @handle: QMI client handle
1532 * @sq: qrtr socket
1533 * @txn: QMI transaction context
1534 * @decoded_msg: decoded QMI message
1535 *
1536 * Main handler for the QMI stream enable/disable requests. This executes the
1537 * corresponding enable/disable stream apis, respectively.
1538 *
1539 */
handle_uaudio_stream_req(struct qmi_handle * handle,struct sockaddr_qrtr * sq,struct qmi_txn * txn,const void * decoded_msg)1540 static void handle_uaudio_stream_req(struct qmi_handle *handle,
1541 struct sockaddr_qrtr *sq,
1542 struct qmi_txn *txn,
1543 const void *decoded_msg)
1544 {
1545 struct qmi_uaudio_stream_req_msg_v01 *req_msg;
1546 struct qmi_uaudio_stream_resp_msg_v01 resp = {{0}, 0};
1547 struct uaudio_qmi_svc *svc = uaudio_svc;
1548 struct snd_usb_audio *chip = NULL;
1549 struct snd_usb_substream *subs;
1550 struct usb_host_endpoint *ep;
1551 int datainterval = -EINVAL;
1552 int info_idx = -EINVAL;
1553 struct intf_info *info;
1554 u8 pcm_card_num;
1555 u8 pcm_dev_num;
1556 u8 direction;
1557 int ret = 0;
1558
1559 if (!svc->client_connected) {
1560 svc->client_sq = *sq;
1561 svc->client_connected = true;
1562 }
1563
1564 mutex_lock(&qdev_mutex);
1565 req_msg = (struct qmi_uaudio_stream_req_msg_v01 *)decoded_msg;
1566 if (!req_msg->audio_format_valid || !req_msg->bit_rate_valid ||
1567 !req_msg->number_of_ch_valid || !req_msg->xfer_buff_size_valid) {
1568 ret = -EINVAL;
1569 goto response;
1570 }
1571
1572 if (!uaudio_qdev) {
1573 ret = -EINVAL;
1574 goto response;
1575 }
1576
1577 direction = (req_msg->usb_token & QMI_STREAM_REQ_DIRECTION);
1578 pcm_dev_num = (req_msg->usb_token & QMI_STREAM_REQ_DEV_NUM_MASK) >> 8;
1579 pcm_card_num = (req_msg->usb_token & QMI_STREAM_REQ_CARD_NUM_MASK) >> 16;
1580 if (pcm_card_num >= SNDRV_CARDS) {
1581 ret = -EINVAL;
1582 goto response;
1583 }
1584
1585 if (req_msg->audio_format > USB_QMI_PCM_FORMAT_U32_BE) {
1586 ret = -EINVAL;
1587 goto response;
1588 }
1589
1590 subs = find_substream(pcm_card_num, pcm_dev_num, direction);
1591 chip = uadev[pcm_card_num].chip;
1592 if (!subs || !chip || atomic_read(&chip->shutdown)) {
1593 ret = -ENODEV;
1594 goto response;
1595 }
1596
1597 info_idx = info_idx_from_ifnum(pcm_card_num, subs->cur_audiofmt ?
1598 subs->cur_audiofmt->iface : -1, req_msg->enable);
1599 if (atomic_read(&chip->shutdown) || !subs->stream || !subs->stream->pcm ||
1600 !subs->stream->chip) {
1601 ret = -ENODEV;
1602 goto response;
1603 }
1604
1605 scoped_guard(mutex, &chip->mutex) {
1606 if (req_msg->enable) {
1607 if (info_idx < 0 || chip->system_suspend || subs->opened) {
1608 ret = -EBUSY;
1609 goto response;
1610 }
1611 subs->opened = 1;
1612 }
1613 }
1614
1615 if (req_msg->service_interval_valid) {
1616 ret = get_data_interval_from_si(subs,
1617 req_msg->service_interval);
1618 if (ret == -EINVAL)
1619 goto response;
1620
1621 datainterval = ret;
1622 }
1623
1624 uadev[pcm_card_num].ctrl_intf = chip->ctrl_intf;
1625
1626 if (req_msg->enable) {
1627 ret = enable_audio_stream(subs,
1628 map_pcm_format(req_msg->audio_format),
1629 req_msg->number_of_ch, req_msg->bit_rate,
1630 datainterval);
1631
1632 if (!ret)
1633 ret = prepare_qmi_response(subs, req_msg, &resp,
1634 info_idx);
1635 if (ret < 0) {
1636 guard(mutex)(&chip->mutex);
1637 subs->opened = 0;
1638 }
1639 } else {
1640 info = &uadev[pcm_card_num].info[info_idx];
1641 if (info->data_ep_pipe) {
1642 ep = usb_pipe_endpoint(uadev[pcm_card_num].udev,
1643 info->data_ep_pipe);
1644 if (ep) {
1645 xhci_sideband_stop_endpoint(uadev[pcm_card_num].sb,
1646 ep);
1647 xhci_sideband_remove_endpoint(uadev[pcm_card_num].sb,
1648 ep);
1649 }
1650
1651 info->data_ep_pipe = 0;
1652 }
1653
1654 if (info->sync_ep_pipe) {
1655 ep = usb_pipe_endpoint(uadev[pcm_card_num].udev,
1656 info->sync_ep_pipe);
1657 if (ep) {
1658 xhci_sideband_stop_endpoint(uadev[pcm_card_num].sb,
1659 ep);
1660 xhci_sideband_remove_endpoint(uadev[pcm_card_num].sb,
1661 ep);
1662 }
1663
1664 info->sync_ep_pipe = 0;
1665 }
1666
1667 disable_audio_stream(subs);
1668 guard(mutex)(&chip->mutex);
1669 subs->opened = 0;
1670 }
1671
1672 response:
1673 if (!req_msg->enable && ret != -EINVAL && ret != -ENODEV) {
1674 guard(mutex)(&chip->mutex);
1675 if (info_idx >= 0) {
1676 info = &uadev[pcm_card_num].info[info_idx];
1677 uaudio_dev_intf_cleanup(uadev[pcm_card_num].udev,
1678 info);
1679 }
1680 if (atomic_read(&uadev[pcm_card_num].in_use))
1681 kref_put(&uadev[pcm_card_num].kref,
1682 uaudio_dev_release);
1683 }
1684 mutex_unlock(&qdev_mutex);
1685
1686 resp.usb_token = req_msg->usb_token;
1687 resp.usb_token_valid = 1;
1688 resp.internal_status = ret;
1689 resp.internal_status_valid = 1;
1690 resp.status = ret ? USB_QMI_STREAM_REQ_FAILURE_V01 : ret;
1691 resp.status_valid = 1;
1692 ret = qmi_send_response(svc->uaudio_svc_hdl, sq, txn,
1693 QMI_UAUDIO_STREAM_RESP_V01,
1694 QMI_UAUDIO_STREAM_RESP_MSG_V01_MAX_MSG_LEN,
1695 qmi_uaudio_stream_resp_msg_v01_ei, &resp);
1696 }
1697
1698 static struct qmi_msg_handler uaudio_stream_req_handlers = {
1699 .type = QMI_REQUEST,
1700 .msg_id = QMI_UAUDIO_STREAM_REQ_V01,
1701 .ei = qmi_uaudio_stream_req_msg_v01_ei,
1702 .decoded_size = QMI_UAUDIO_STREAM_REQ_MSG_V01_MAX_MSG_LEN,
1703 .fn = handle_uaudio_stream_req,
1704 };
1705
1706 /**
1707 * qc_usb_audio_offload_init_qmi_dev() - initializes qmi dev
1708 *
1709 * Initializes the USB qdev, which is used to carry information pertaining to
1710 * the offloading resources. This device is freed only when there are no longer
1711 * any offloading candidates. (i.e, when all audio devices are disconnected)
1712 *
1713 */
qc_usb_audio_offload_init_qmi_dev(void)1714 static int qc_usb_audio_offload_init_qmi_dev(void)
1715 {
1716 uaudio_qdev = kzalloc_obj(*uaudio_qdev);
1717 if (!uaudio_qdev)
1718 return -ENOMEM;
1719
1720 /* initialize xfer ring and xfer buf iova list */
1721 INIT_LIST_HEAD(&uaudio_qdev->xfer_ring_list);
1722 uaudio_qdev->curr_xfer_ring_iova = IOVA_XFER_RING_BASE;
1723 uaudio_qdev->xfer_ring_iova_size =
1724 IOVA_XFER_RING_MAX - IOVA_XFER_RING_BASE;
1725
1726 INIT_LIST_HEAD(&uaudio_qdev->xfer_buf_list);
1727 uaudio_qdev->curr_xfer_buf_iova = IOVA_XFER_BUF_BASE;
1728 uaudio_qdev->xfer_buf_iova_size =
1729 IOVA_XFER_BUF_MAX - IOVA_XFER_BUF_BASE;
1730
1731 return 0;
1732 }
1733
1734 /* 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)1735 static int qc_usb_audio_offload_fill_avail_pcms(struct snd_usb_audio *chip,
1736 struct snd_soc_usb_device *sdev)
1737 {
1738 struct snd_usb_stream *as;
1739 struct snd_usb_substream *subs;
1740 int idx = 0;
1741
1742 list_for_each_entry(as, &chip->pcm_list, list) {
1743 subs = &as->substream[SNDRV_PCM_STREAM_PLAYBACK];
1744 if (subs->ep_num) {
1745 sdev->ppcm_idx[idx] = as->pcm->device;
1746 idx++;
1747 }
1748 /*
1749 * Break if the current index exceeds the number of possible
1750 * playback streams counted from the UAC descriptors.
1751 */
1752 if (idx >= sdev->num_playback)
1753 break;
1754 }
1755
1756 return -1;
1757 }
1758
1759 /**
1760 * qc_usb_audio_offload_probe() - platform op connect handler
1761 * @chip: USB SND device
1762 *
1763 * Platform connect handler when a USB SND device is detected. Will
1764 * notify SOC USB about the connection to enable the USB ASoC backend
1765 * and populate internal USB chip array.
1766 *
1767 */
qc_usb_audio_offload_probe(struct snd_usb_audio * chip)1768 static void qc_usb_audio_offload_probe(struct snd_usb_audio *chip)
1769 {
1770 struct usb_interface *intf = chip->intf[chip->num_interfaces - 1];
1771 struct usb_interface_descriptor *altsd;
1772 struct usb_host_interface *alts;
1773 struct snd_soc_usb_device *sdev;
1774 struct xhci_sideband *sb;
1775
1776 /*
1777 * If there is no priv_data, or no playback paths, the connected
1778 * device doesn't support offloading. Avoid populating entries for
1779 * this device.
1780 */
1781 if (!snd_soc_usb_find_priv_data(uaudio_qdev->auxdev->dev.parent) ||
1782 !usb_qmi_get_pcm_num(chip, 0))
1783 return;
1784
1785 guard(mutex)(&qdev_mutex);
1786 guard(mutex)(&chip->mutex);
1787 if (!uadev[chip->card->number].chip) {
1788 sdev = kzalloc_obj(*sdev);
1789 if (!sdev)
1790 return;
1791
1792 sb = xhci_sideband_register(intf, XHCI_SIDEBAND_VENDOR,
1793 uaudio_sideband_notifier);
1794 if (!sb)
1795 goto free_sdev;
1796 } else {
1797 sb = uadev[chip->card->number].sb;
1798 sdev = uadev[chip->card->number].sdev;
1799 }
1800
1801 uadev[chip->card->number].sb = sb;
1802 uadev[chip->card->number].chip = chip;
1803 uadev[chip->card->number].sdev = sdev;
1804
1805 alts = &intf->altsetting[0];
1806 altsd = get_iface_desc(alts);
1807
1808 /* Wait until all PCM devices are populated before notifying soc-usb */
1809 if (altsd->bInterfaceNumber == chip->last_iface) {
1810 sdev->num_playback = usb_qmi_get_pcm_num(chip, 0);
1811
1812 /*
1813 * Allocate playback pcm index array based on number of possible
1814 * playback paths within the UAC descriptors.
1815 */
1816 sdev->ppcm_idx = kcalloc(sdev->num_playback, sizeof(unsigned int),
1817 GFP_KERNEL);
1818 if (!sdev->ppcm_idx)
1819 goto unreg_xhci;
1820
1821 qc_usb_audio_offload_fill_avail_pcms(chip, sdev);
1822 sdev->card_idx = chip->card->number;
1823 sdev->chip_idx = chip->index;
1824
1825 snd_usb_offload_create_ctl(chip, uaudio_qdev->auxdev->dev.parent);
1826 snd_soc_usb_connect(uaudio_qdev->auxdev->dev.parent, sdev);
1827 }
1828
1829 return;
1830
1831 unreg_xhci:
1832 xhci_sideband_unregister(sb);
1833 uadev[chip->card->number].sb = NULL;
1834 free_sdev:
1835 kfree(sdev);
1836 uadev[chip->card->number].sdev = NULL;
1837 uadev[chip->card->number].chip = NULL;
1838 }
1839
1840 /**
1841 * qc_usb_audio_cleanup_qmi_dev() - release qmi device
1842 *
1843 * Frees the USB qdev. Only occurs when there are no longer any potential
1844 * devices that can utilize USB audio offloading.
1845 *
1846 */
qc_usb_audio_cleanup_qmi_dev(void)1847 static void qc_usb_audio_cleanup_qmi_dev(void)
1848 {
1849 kfree(uaudio_qdev);
1850 uaudio_qdev = NULL;
1851 }
1852
1853 /**
1854 * qc_usb_audio_offload_disconnect() - platform op disconnect handler
1855 * @chip: USB SND device
1856 *
1857 * Platform disconnect handler. Will ensure that any pending stream is
1858 * halted by issuing a QMI disconnect indication packet to the adsp.
1859 *
1860 */
qc_usb_audio_offload_disconnect(struct snd_usb_audio * chip)1861 static void qc_usb_audio_offload_disconnect(struct snd_usb_audio *chip)
1862 {
1863 struct uaudio_dev *dev;
1864 int card_num;
1865
1866 if (!chip)
1867 return;
1868
1869 card_num = chip->card->number;
1870 if (card_num >= SNDRV_CARDS)
1871 return;
1872
1873 guard(mutex)(&qdev_mutex);
1874 guard(mutex)(&chip->mutex);
1875 dev = &uadev[card_num];
1876
1877 /* Device has already been cleaned up, or never populated */
1878 if (!dev->chip)
1879 return;
1880
1881 /* cleaned up already */
1882 if (!dev->udev)
1883 goto done;
1884
1885 uaudio_send_disconnect_ind(chip);
1886 uaudio_dev_cleanup(dev);
1887 done:
1888 /*
1889 * If num_interfaces == 1, the last USB SND interface is being removed.
1890 * This is to accommodate for devices w/ multiple UAC functions.
1891 */
1892 if (chip->num_interfaces == 1) {
1893 snd_soc_usb_disconnect(uaudio_qdev->auxdev->dev.parent, dev->sdev);
1894 xhci_sideband_unregister(dev->sb);
1895 dev->chip = NULL;
1896 kfree(dev->sdev->ppcm_idx);
1897 kfree(dev->sdev);
1898 dev->sdev = NULL;
1899 }
1900 }
1901
1902 /**
1903 * qc_usb_audio_offload_suspend() - USB offload PM suspend handler
1904 * @intf: USB interface
1905 * @message: suspend type
1906 *
1907 * PM suspend handler to ensure that the USB offloading driver is able to stop
1908 * any pending traffic, so that the bus can be suspended.
1909 *
1910 */
qc_usb_audio_offload_suspend(struct usb_interface * intf,pm_message_t message)1911 static void qc_usb_audio_offload_suspend(struct usb_interface *intf,
1912 pm_message_t message)
1913 {
1914 struct snd_usb_audio *chip = usb_get_intfdata(intf);
1915 int card_num;
1916
1917 if (!chip)
1918 return;
1919
1920 card_num = chip->card->number;
1921 if (card_num >= SNDRV_CARDS)
1922 return;
1923
1924 guard(mutex)(&qdev_mutex);
1925 guard(mutex)(&chip->mutex);
1926
1927 uaudio_send_disconnect_ind(chip);
1928 }
1929
1930 static struct snd_usb_platform_ops offload_ops = {
1931 .connect_cb = qc_usb_audio_offload_probe,
1932 .disconnect_cb = qc_usb_audio_offload_disconnect,
1933 .suspend_cb = qc_usb_audio_offload_suspend,
1934 };
1935
qc_usb_audio_probe(struct auxiliary_device * auxdev,const struct auxiliary_device_id * id)1936 static int qc_usb_audio_probe(struct auxiliary_device *auxdev,
1937 const struct auxiliary_device_id *id)
1938
1939 {
1940 struct uaudio_qmi_svc *svc;
1941 int ret;
1942
1943 svc = kzalloc_obj(*svc);
1944 if (!svc)
1945 return -ENOMEM;
1946
1947 svc->uaudio_svc_hdl = kzalloc_obj(*svc->uaudio_svc_hdl);
1948 if (!svc->uaudio_svc_hdl) {
1949 ret = -ENOMEM;
1950 goto free_svc;
1951 }
1952
1953 ret = qmi_handle_init(svc->uaudio_svc_hdl,
1954 QMI_UAUDIO_STREAM_REQ_MSG_V01_MAX_MSG_LEN,
1955 &uaudio_svc_ops_options,
1956 &uaudio_stream_req_handlers);
1957 ret = qmi_add_server(svc->uaudio_svc_hdl, UAUDIO_STREAM_SERVICE_ID_V01,
1958 UAUDIO_STREAM_SERVICE_VERS_V01, 0);
1959
1960 uaudio_svc = svc;
1961
1962 qc_usb_audio_offload_init_qmi_dev();
1963 uaudio_qdev->auxdev = auxdev;
1964
1965 ret = snd_usb_register_platform_ops(&offload_ops);
1966 if (ret < 0)
1967 goto release_qmi;
1968
1969 snd_usb_rediscover_devices();
1970
1971 return 0;
1972
1973 release_qmi:
1974 qc_usb_audio_cleanup_qmi_dev();
1975 qmi_handle_release(svc->uaudio_svc_hdl);
1976 free_svc:
1977 kfree(svc);
1978
1979 return ret;
1980 }
1981
qc_usb_audio_remove(struct auxiliary_device * auxdev)1982 static void qc_usb_audio_remove(struct auxiliary_device *auxdev)
1983 {
1984 struct uaudio_qmi_svc *svc = uaudio_svc;
1985 int idx;
1986
1987 /*
1988 * Remove all connected devices after unregistering ops, to ensure
1989 * that no further connect events will occur. The disconnect routine
1990 * will issue the QMI disconnect indication, which results in the
1991 * external DSP to stop issuing transfers.
1992 */
1993 snd_usb_unregister_platform_ops();
1994 for (idx = 0; idx < SNDRV_CARDS; idx++)
1995 qc_usb_audio_offload_disconnect(uadev[idx].chip);
1996
1997 qc_usb_audio_cleanup_qmi_dev();
1998
1999 qmi_handle_release(svc->uaudio_svc_hdl);
2000 kfree(svc);
2001 uaudio_svc = NULL;
2002 }
2003
2004 static const struct auxiliary_device_id qc_usb_audio_table[] = {
2005 { .name = "q6usb.qc-usb-audio-offload" },
2006 {},
2007 };
2008 MODULE_DEVICE_TABLE(auxiliary, qc_usb_audio_table);
2009
2010 static struct auxiliary_driver qc_usb_audio_offload_drv = {
2011 .name = "qc-usb-audio-offload",
2012 .id_table = qc_usb_audio_table,
2013 .probe = qc_usb_audio_probe,
2014 .remove = qc_usb_audio_remove,
2015 };
2016 module_auxiliary_driver(qc_usb_audio_offload_drv);
2017
2018 MODULE_DESCRIPTION("QC USB Audio Offloading");
2019 MODULE_LICENSE("GPL");
2020