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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Conexant Cx231xx audio extension4 *5 * Copyright (C) 2008 <srinivasa.deevi at conexant dot com>6 * Based on em28xx driver7 */8 9#include "cx231xx.h"10#include <linux/kernel.h>11#include <linux/init.h>12#include <linux/sound.h>13#include <linux/spinlock.h>14#include <linux/soundcard.h>15#include <linux/slab.h>16#include <linux/module.h>17#include <sound/core.h>18#include <sound/pcm.h>19#include <sound/pcm_params.h>20#include <sound/info.h>21#include <sound/initval.h>22#include <sound/control.h>23#include <media/v4l2-common.h>24 25static int debug;26module_param(debug, int, 0644);27MODULE_PARM_DESC(debug, "activates debug info");28 29static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;30 31static int cx231xx_isoc_audio_deinit(struct cx231xx *dev)32{33 int i;34 35 dev_dbg(dev->dev, "Stopping isoc\n");36 37 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {38 if (dev->adev.urb[i]) {39 if (!irqs_disabled())40 usb_kill_urb(dev->adev.urb[i]);41 else42 usb_unlink_urb(dev->adev.urb[i]);43 44 usb_free_urb(dev->adev.urb[i]);45 dev->adev.urb[i] = NULL;46 47 kfree(dev->adev.transfer_buffer[i]);48 dev->adev.transfer_buffer[i] = NULL;49 }50 }51 52 return 0;53}54 55static int cx231xx_bulk_audio_deinit(struct cx231xx *dev)56{57 int i;58 59 dev_dbg(dev->dev, "Stopping bulk\n");60 61 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {62 if (dev->adev.urb[i]) {63 if (!irqs_disabled())64 usb_kill_urb(dev->adev.urb[i]);65 else66 usb_unlink_urb(dev->adev.urb[i]);67 68 usb_free_urb(dev->adev.urb[i]);69 dev->adev.urb[i] = NULL;70 71 kfree(dev->adev.transfer_buffer[i]);72 dev->adev.transfer_buffer[i] = NULL;73 }74 }75 76 return 0;77}78 79static void cx231xx_audio_isocirq(struct urb *urb)80{81 struct cx231xx *dev = urb->context;82 int i;83 unsigned int oldptr;84 int period_elapsed = 0;85 int status;86 unsigned char *cp;87 unsigned int stride;88 struct snd_pcm_substream *substream;89 struct snd_pcm_runtime *runtime;90 91 if (dev->state & DEV_DISCONNECTED)92 return;93 94 switch (urb->status) {95 case 0: /* success */96 case -ETIMEDOUT: /* NAK */97 break;98 case -ECONNRESET: /* kill */99 case -ENOENT:100 case -ESHUTDOWN:101 return;102 default: /* error */103 dev_dbg(dev->dev, "urb completion error %d.\n",104 urb->status);105 break;106 }107 108 if (atomic_read(&dev->stream_started) == 0)109 return;110 111 if (dev->adev.capture_pcm_substream) {112 substream = dev->adev.capture_pcm_substream;113 runtime = substream->runtime;114 stride = runtime->frame_bits >> 3;115 116 for (i = 0; i < urb->number_of_packets; i++) {117 unsigned long flags;118 int length = urb->iso_frame_desc[i].actual_length /119 stride;120 cp = (unsigned char *)urb->transfer_buffer +121 urb->iso_frame_desc[i].offset;122 123 if (!length)124 continue;125 126 oldptr = dev->adev.hwptr_done_capture;127 if (oldptr + length >= runtime->buffer_size) {128 unsigned int cnt;129 130 cnt = runtime->buffer_size - oldptr;131 memcpy(runtime->dma_area + oldptr * stride, cp,132 cnt * stride);133 memcpy(runtime->dma_area, cp + cnt * stride,134 length * stride - cnt * stride);135 } else {136 memcpy(runtime->dma_area + oldptr * stride, cp,137 length * stride);138 }139 140 snd_pcm_stream_lock_irqsave(substream, flags);141 142 dev->adev.hwptr_done_capture += length;143 if (dev->adev.hwptr_done_capture >=144 runtime->buffer_size)145 dev->adev.hwptr_done_capture -=146 runtime->buffer_size;147 148 dev->adev.capture_transfer_done += length;149 if (dev->adev.capture_transfer_done >=150 runtime->period_size) {151 dev->adev.capture_transfer_done -=152 runtime->period_size;153 period_elapsed = 1;154 }155 snd_pcm_stream_unlock_irqrestore(substream, flags);156 }157 if (period_elapsed)158 snd_pcm_period_elapsed(substream);159 }160 urb->status = 0;161 162 status = usb_submit_urb(urb, GFP_ATOMIC);163 if (status < 0) {164 dev_err(dev->dev,165 "resubmit of audio urb failed (error=%i)\n",166 status);167 }168 return;169}170 171static void cx231xx_audio_bulkirq(struct urb *urb)172{173 struct cx231xx *dev = urb->context;174 unsigned int oldptr;175 int period_elapsed = 0;176 int status;177 unsigned char *cp;178 unsigned int stride;179 struct snd_pcm_substream *substream;180 struct snd_pcm_runtime *runtime;181 182 if (dev->state & DEV_DISCONNECTED)183 return;184 185 switch (urb->status) {186 case 0: /* success */187 case -ETIMEDOUT: /* NAK */188 break;189 case -ECONNRESET: /* kill */190 case -ENOENT:191 case -ESHUTDOWN:192 return;193 default: /* error */194 dev_dbg(dev->dev, "urb completion error %d.\n",195 urb->status);196 break;197 }198 199 if (atomic_read(&dev->stream_started) == 0)200 return;201 202 if (dev->adev.capture_pcm_substream) {203 substream = dev->adev.capture_pcm_substream;204 runtime = substream->runtime;205 stride = runtime->frame_bits >> 3;206 207 if (1) {208 unsigned long flags;209 int length = urb->actual_length /210 stride;211 cp = (unsigned char *)urb->transfer_buffer;212 213 oldptr = dev->adev.hwptr_done_capture;214 if (oldptr + length >= runtime->buffer_size) {215 unsigned int cnt;216 217 cnt = runtime->buffer_size - oldptr;218 memcpy(runtime->dma_area + oldptr * stride, cp,219 cnt * stride);220 memcpy(runtime->dma_area, cp + cnt * stride,221 length * stride - cnt * stride);222 } else {223 memcpy(runtime->dma_area + oldptr * stride, cp,224 length * stride);225 }226 227 snd_pcm_stream_lock_irqsave(substream, flags);228 229 dev->adev.hwptr_done_capture += length;230 if (dev->adev.hwptr_done_capture >=231 runtime->buffer_size)232 dev->adev.hwptr_done_capture -=233 runtime->buffer_size;234 235 dev->adev.capture_transfer_done += length;236 if (dev->adev.capture_transfer_done >=237 runtime->period_size) {238 dev->adev.capture_transfer_done -=239 runtime->period_size;240 period_elapsed = 1;241 }242 snd_pcm_stream_unlock_irqrestore(substream, flags);243 }244 if (period_elapsed)245 snd_pcm_period_elapsed(substream);246 }247 urb->status = 0;248 249 status = usb_submit_urb(urb, GFP_ATOMIC);250 if (status < 0) {251 dev_err(dev->dev,252 "resubmit of audio urb failed (error=%i)\n",253 status);254 }255 return;256}257 258static int cx231xx_init_audio_isoc(struct cx231xx *dev)259{260 int i, errCode;261 int sb_size;262 263 dev_dbg(dev->dev,264 "%s: Starting ISO AUDIO transfers\n", __func__);265 266 if (dev->state & DEV_DISCONNECTED)267 return -ENODEV;268 269 sb_size = CX231XX_ISO_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;270 271 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {272 struct urb *urb;273 int j, k;274 275 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);276 if (!dev->adev.transfer_buffer[i])277 return -ENOMEM;278 279 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);280 urb = usb_alloc_urb(CX231XX_ISO_NUM_AUDIO_PACKETS, GFP_ATOMIC);281 if (!urb) {282 for (j = 0; j < i; j++) {283 usb_free_urb(dev->adev.urb[j]);284 kfree(dev->adev.transfer_buffer[j]);285 }286 return -ENOMEM;287 }288 289 urb->dev = dev->udev;290 urb->context = dev;291 urb->pipe = usb_rcvisocpipe(dev->udev,292 dev->adev.end_point_addr);293 urb->transfer_flags = URB_ISO_ASAP;294 urb->transfer_buffer = dev->adev.transfer_buffer[i];295 urb->interval = 1;296 urb->complete = cx231xx_audio_isocirq;297 urb->number_of_packets = CX231XX_ISO_NUM_AUDIO_PACKETS;298 urb->transfer_buffer_length = sb_size;299 300 for (j = k = 0; j < CX231XX_ISO_NUM_AUDIO_PACKETS;301 j++, k += dev->adev.max_pkt_size) {302 urb->iso_frame_desc[j].offset = k;303 urb->iso_frame_desc[j].length = dev->adev.max_pkt_size;304 }305 dev->adev.urb[i] = urb;306 }307 308 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {309 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);310 if (errCode < 0) {311 cx231xx_isoc_audio_deinit(dev);312 return errCode;313 }314 }315 316 return errCode;317}318 319static int cx231xx_init_audio_bulk(struct cx231xx *dev)320{321 int i, errCode;322 int sb_size;323 324 dev_dbg(dev->dev,325 "%s: Starting BULK AUDIO transfers\n", __func__);326 327 if (dev->state & DEV_DISCONNECTED)328 return -ENODEV;329 330 sb_size = CX231XX_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;331 332 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {333 struct urb *urb;334 int j;335 336 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);337 if (!dev->adev.transfer_buffer[i])338 return -ENOMEM;339 340 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);341 urb = usb_alloc_urb(CX231XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);342 if (!urb) {343 for (j = 0; j < i; j++) {344 usb_free_urb(dev->adev.urb[j]);345 kfree(dev->adev.transfer_buffer[j]);346 }347 return -ENOMEM;348 }349 350 urb->dev = dev->udev;351 urb->context = dev;352 urb->pipe = usb_rcvbulkpipe(dev->udev,353 dev->adev.end_point_addr);354 urb->transfer_flags = 0;355 urb->transfer_buffer = dev->adev.transfer_buffer[i];356 urb->complete = cx231xx_audio_bulkirq;357 urb->transfer_buffer_length = sb_size;358 359 dev->adev.urb[i] = urb;360 361 }362 363 for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {364 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);365 if (errCode < 0) {366 cx231xx_bulk_audio_deinit(dev);367 return errCode;368 }369 }370 371 return errCode;372}373 374static const struct snd_pcm_hardware snd_cx231xx_hw_capture = {375 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |376 SNDRV_PCM_INFO_MMAP |377 SNDRV_PCM_INFO_INTERLEAVED |378 SNDRV_PCM_INFO_MMAP_VALID,379 380 .formats = SNDRV_PCM_FMTBIT_S16_LE,381 382 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,383 384 .rate_min = 48000,385 .rate_max = 48000,386 .channels_min = 2,387 .channels_max = 2,388 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */389 .period_bytes_min = 64, /* 12544/2, */390 .period_bytes_max = 12544,391 .periods_min = 2,392 .periods_max = 98, /* 12544, */393};394 395static int snd_cx231xx_capture_open(struct snd_pcm_substream *substream)396{397 struct cx231xx *dev = snd_pcm_substream_chip(substream);398 struct snd_pcm_runtime *runtime = substream->runtime;399 int ret = 0;400 401 dev_dbg(dev->dev,402 "opening device and trying to acquire exclusive lock\n");403 404 if (dev->state & DEV_DISCONNECTED) {405 dev_err(dev->dev,406 "Can't open. the device was removed.\n");407 return -ENODEV;408 }409 410 /* set alternate setting for audio interface */411 /* 1 - 48000 samples per sec */412 mutex_lock(&dev->lock);413 if (dev->USE_ISO)414 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 1);415 else416 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);417 mutex_unlock(&dev->lock);418 if (ret < 0) {419 dev_err(dev->dev,420 "failed to set alternate setting !\n");421 422 return ret;423 }424 425 runtime->hw = snd_cx231xx_hw_capture;426 427 mutex_lock(&dev->lock);428 /* inform hardware to start streaming */429 ret = cx231xx_capture_start(dev, 1, Audio);430 431 dev->adev.users++;432 mutex_unlock(&dev->lock);433 434 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);435 dev->adev.capture_pcm_substream = substream;436 runtime->private_data = dev;437 438 return 0;439}440 441static int snd_cx231xx_pcm_close(struct snd_pcm_substream *substream)442{443 int ret;444 struct cx231xx *dev = snd_pcm_substream_chip(substream);445 446 dev_dbg(dev->dev, "closing device\n");447 448 /* inform hardware to stop streaming */449 mutex_lock(&dev->lock);450 ret = cx231xx_capture_start(dev, 0, Audio);451 452 /* set alternate setting for audio interface */453 /* 1 - 48000 samples per sec */454 ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);455 if (ret < 0) {456 dev_err(dev->dev,457 "failed to set alternate setting !\n");458 459 mutex_unlock(&dev->lock);460 return ret;461 }462 463 dev->adev.users--;464 mutex_unlock(&dev->lock);465 466 if (dev->adev.users == 0 && dev->adev.shutdown == 1) {467 dev_dbg(dev->dev, "audio users: %d\n", dev->adev.users);468 dev_dbg(dev->dev, "disabling audio stream!\n");469 dev->adev.shutdown = 0;470 dev_dbg(dev->dev, "released lock\n");471 if (atomic_read(&dev->stream_started) > 0) {472 atomic_set(&dev->stream_started, 0);473 schedule_work(&dev->wq_trigger);474 }475 }476 return 0;477}478 479static int snd_cx231xx_prepare(struct snd_pcm_substream *substream)480{481 struct cx231xx *dev = snd_pcm_substream_chip(substream);482 483 dev->adev.hwptr_done_capture = 0;484 dev->adev.capture_transfer_done = 0;485 486 return 0;487}488 489static void audio_trigger(struct work_struct *work)490{491 struct cx231xx *dev = container_of(work, struct cx231xx, wq_trigger);492 493 if (atomic_read(&dev->stream_started)) {494 dev_dbg(dev->dev, "starting capture");495 if (is_fw_load(dev) == 0)496 cx25840_call(dev, core, load_fw);497 if (dev->USE_ISO)498 cx231xx_init_audio_isoc(dev);499 else500 cx231xx_init_audio_bulk(dev);501 } else {502 dev_dbg(dev->dev, "stopping capture");503 cx231xx_isoc_audio_deinit(dev);504 }505}506 507static int snd_cx231xx_capture_trigger(struct snd_pcm_substream *substream,508 int cmd)509{510 struct cx231xx *dev = snd_pcm_substream_chip(substream);511 int retval = 0;512 513 if (dev->state & DEV_DISCONNECTED)514 return -ENODEV;515 516 spin_lock(&dev->adev.slock);517 switch (cmd) {518 case SNDRV_PCM_TRIGGER_START:519 atomic_set(&dev->stream_started, 1);520 break;521 case SNDRV_PCM_TRIGGER_STOP:522 atomic_set(&dev->stream_started, 0);523 break;524 default:525 retval = -EINVAL;526 break;527 }528 spin_unlock(&dev->adev.slock);529 530 schedule_work(&dev->wq_trigger);531 532 return retval;533}534 535static snd_pcm_uframes_t snd_cx231xx_capture_pointer(struct snd_pcm_substream536 *substream)537{538 struct cx231xx *dev;539 unsigned long flags;540 snd_pcm_uframes_t hwptr_done;541 542 dev = snd_pcm_substream_chip(substream);543 544 spin_lock_irqsave(&dev->adev.slock, flags);545 hwptr_done = dev->adev.hwptr_done_capture;546 spin_unlock_irqrestore(&dev->adev.slock, flags);547 548 return hwptr_done;549}550 551static const struct snd_pcm_ops snd_cx231xx_pcm_capture = {552 .open = snd_cx231xx_capture_open,553 .close = snd_cx231xx_pcm_close,554 .prepare = snd_cx231xx_prepare,555 .trigger = snd_cx231xx_capture_trigger,556 .pointer = snd_cx231xx_capture_pointer,557};558 559static int cx231xx_audio_init(struct cx231xx *dev)560{561 struct cx231xx_audio *adev = &dev->adev;562 struct snd_pcm *pcm;563 struct snd_card *card;564 static int devnr;565 int err;566 struct usb_interface *uif;567 int i, isoc_pipe = 0;568 569 if (dev->has_alsa_audio != 1) {570 /* This device does not support the extension (in this case571 the device is expecting the snd-usb-audio module or572 doesn't have analog audio support at all) */573 return 0;574 }575 576 dev_dbg(dev->dev,577 "probing for cx231xx non standard usbaudio\n");578 579 err = snd_card_new(dev->dev, index[devnr], "Cx231xx Audio",580 THIS_MODULE, 0, &card);581 if (err < 0)582 return err;583 584 spin_lock_init(&adev->slock);585 err = snd_pcm_new(card, "Cx231xx Audio", 0, 0, 1, &pcm);586 if (err < 0)587 goto err_free_card;588 589 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,590 &snd_cx231xx_pcm_capture);591 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0);592 pcm->info_flags = 0;593 pcm->private_data = dev;594 strscpy(pcm->name, "Conexant cx231xx Capture", sizeof(pcm->name));595 strscpy(card->driver, "Cx231xx-Audio", sizeof(card->driver));596 strscpy(card->shortname, "Cx231xx Audio", sizeof(card->shortname));597 strscpy(card->longname, "Conexant cx231xx Audio", sizeof(card->longname));598 599 INIT_WORK(&dev->wq_trigger, audio_trigger);600 601 err = snd_card_register(card);602 if (err < 0)603 goto err_free_card;604 605 adev->sndcard = card;606 adev->udev = dev->udev;607 608 /* compute alternate max packet sizes for Audio */609 uif =610 dev->udev->actconfig->interface[dev->current_pcb_config.611 hs_config_info[0].interface_info.612 audio_index + 1];613 614 if (uif->altsetting[0].desc.bNumEndpoints < isoc_pipe + 1) {615 err = -ENODEV;616 goto err_free_card;617 }618 619 adev->end_point_addr =620 uif->altsetting[0].endpoint[isoc_pipe].desc.621 bEndpointAddress;622 623 adev->num_alt = uif->num_altsetting;624 dev_info(dev->dev,625 "audio EndPoint Addr 0x%x, Alternate settings: %i\n",626 adev->end_point_addr, adev->num_alt);627 adev->alt_max_pkt_size = kmalloc_array(32, adev->num_alt, GFP_KERNEL);628 if (!adev->alt_max_pkt_size) {629 err = -ENOMEM;630 goto err_free_card;631 }632 633 for (i = 0; i < adev->num_alt; i++) {634 u16 tmp;635 636 if (uif->altsetting[i].desc.bNumEndpoints < isoc_pipe + 1) {637 err = -ENODEV;638 goto err_free_pkt_size;639 }640 641 tmp = le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc.642 wMaxPacketSize);643 adev->alt_max_pkt_size[i] =644 (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);645 dev_dbg(dev->dev,646 "audio alternate setting %i, max size= %i\n", i,647 adev->alt_max_pkt_size[i]);648 }649 650 return 0;651 652err_free_pkt_size:653 kfree(adev->alt_max_pkt_size);654err_free_card:655 snd_card_free(card);656 657 return err;658}659 660static int cx231xx_audio_fini(struct cx231xx *dev)661{662 if (dev == NULL)663 return 0;664 665 if (dev->has_alsa_audio != 1) {666 /* This device does not support the extension (in this case667 the device is expecting the snd-usb-audio module or668 doesn't have analog audio support at all) */669 return 0;670 }671 672 if (dev->adev.sndcard) {673 snd_card_free_when_closed(dev->adev.sndcard);674 kfree(dev->adev.alt_max_pkt_size);675 dev->adev.sndcard = NULL;676 }677 678 return 0;679}680 681static struct cx231xx_ops audio_ops = {682 .id = CX231XX_AUDIO,683 .name = "Cx231xx Audio Extension",684 .init = cx231xx_audio_init,685 .fini = cx231xx_audio_fini,686};687 688static int __init cx231xx_alsa_register(void)689{690 return cx231xx_register_extension(&audio_ops);691}692 693static void __exit cx231xx_alsa_unregister(void)694{695 cx231xx_unregister_extension(&audio_ops);696}697 698MODULE_LICENSE("GPL");699MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>");700MODULE_DESCRIPTION("Cx231xx Audio driver");701 702module_init(cx231xx_alsa_register);703module_exit(cx231xx_alsa_unregister);704