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1// SPDX-License-Identifier: GPL-2.0+2//3// Empiatech em28x1 audio extension4//5// Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com>6//7// Copyright (C) 2007-2016 Mauro Carvalho Chehab8// - Port to work with the in-kernel driver9// - Cleanups, fixes, alsa-controls, etc.10//11// This driver is based on my previous au600 usb pstn audio driver12// and inherits all the copyrights13 14#include "em28xx.h"15 16#include <linux/kernel.h>17#include <linux/usb.h>18#include <linux/init.h>19#include <linux/sound.h>20#include <linux/spinlock.h>21#include <linux/soundcard.h>22#include <linux/slab.h>23#include <linux/module.h>24#include <sound/core.h>25#include <sound/pcm.h>26#include <sound/pcm_params.h>27#include <sound/info.h>28#include <sound/initval.h>29#include <sound/control.h>30#include <sound/tlv.h>31#include <sound/ac97_codec.h>32#include <media/v4l2-common.h>33 34static int debug;35module_param(debug, int, 0644);36MODULE_PARM_DESC(debug, "activates debug info");37 38#define EM28XX_MAX_AUDIO_BUFS 539#define EM28XX_MIN_AUDIO_PACKETS 6440 41#define dprintk(fmt, arg...) do { \42 if (debug) \43 dev_printk(KERN_DEBUG, &dev->intf->dev, \44 "video: %s: " fmt, __func__, ## arg); \45} while (0)46 47static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;48 49static int em28xx_deinit_isoc_audio(struct em28xx *dev)50{51 int i;52 53 dprintk("Stopping isoc\n");54 for (i = 0; i < dev->adev.num_urb; i++) {55 struct urb *urb = dev->adev.urb[i];56 57 if (!irqs_disabled())58 usb_kill_urb(urb);59 else60 usb_unlink_urb(urb);61 }62 63 return 0;64}65 66static void em28xx_audio_isocirq(struct urb *urb)67{68 struct em28xx *dev = urb->context;69 int i;70 unsigned int oldptr;71 int period_elapsed = 0;72 int status;73 unsigned char *cp;74 unsigned int stride;75 struct snd_pcm_substream *substream;76 struct snd_pcm_runtime *runtime;77 78 if (dev->disconnected) {79 dprintk("device disconnected while streaming. URB status=%d.\n",80 urb->status);81 atomic_set(&dev->adev.stream_started, 0);82 return;83 }84 85 switch (urb->status) {86 case 0: /* success */87 case -ETIMEDOUT: /* NAK */88 break;89 case -ECONNRESET: /* kill */90 case -ENOENT:91 case -ESHUTDOWN:92 return;93 default: /* error */94 dprintk("urb completion error %d.\n", urb->status);95 break;96 }97 98 if (atomic_read(&dev->adev.stream_started) == 0)99 return;100 101 if (dev->adev.capture_pcm_substream) {102 substream = dev->adev.capture_pcm_substream;103 runtime = substream->runtime;104 stride = runtime->frame_bits >> 3;105 106 for (i = 0; i < urb->number_of_packets; i++) {107 unsigned long flags;108 int length =109 urb->iso_frame_desc[i].actual_length / stride;110 cp = (unsigned char *)urb->transfer_buffer +111 urb->iso_frame_desc[i].offset;112 113 if (!length)114 continue;115 116 oldptr = dev->adev.hwptr_done_capture;117 if (oldptr + length >= runtime->buffer_size) {118 unsigned int cnt =119 runtime->buffer_size - oldptr;120 memcpy(runtime->dma_area + oldptr * stride, cp,121 cnt * stride);122 memcpy(runtime->dma_area, cp + cnt * stride,123 length * stride - cnt * stride);124 } else {125 memcpy(runtime->dma_area + oldptr * stride, cp,126 length * stride);127 }128 129 snd_pcm_stream_lock_irqsave(substream, flags);130 131 dev->adev.hwptr_done_capture += length;132 if (dev->adev.hwptr_done_capture >=133 runtime->buffer_size)134 dev->adev.hwptr_done_capture -=135 runtime->buffer_size;136 137 dev->adev.capture_transfer_done += length;138 if (dev->adev.capture_transfer_done >=139 runtime->period_size) {140 dev->adev.capture_transfer_done -=141 runtime->period_size;142 period_elapsed = 1;143 }144 145 snd_pcm_stream_unlock_irqrestore(substream, flags);146 }147 if (period_elapsed)148 snd_pcm_period_elapsed(substream);149 }150 urb->status = 0;151 152 status = usb_submit_urb(urb, GFP_ATOMIC);153 if (status < 0)154 dev_err(&dev->intf->dev,155 "resubmit of audio urb failed (error=%i)\n",156 status);157}158 159static int em28xx_init_audio_isoc(struct em28xx *dev)160{161 int i, err;162 163 dprintk("Starting isoc transfers\n");164 165 /* Start streaming */166 for (i = 0; i < dev->adev.num_urb; i++) {167 memset(dev->adev.transfer_buffer[i], 0x80,168 dev->adev.urb[i]->transfer_buffer_length);169 170 err = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);171 if (err) {172 dev_err(&dev->intf->dev,173 "submit of audio urb failed (error=%i)\n",174 err);175 em28xx_deinit_isoc_audio(dev);176 atomic_set(&dev->adev.stream_started, 0);177 return err;178 }179 }180 181 return 0;182}183 184static const struct snd_pcm_hardware snd_em28xx_hw_capture = {185 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |186 SNDRV_PCM_INFO_MMAP |187 SNDRV_PCM_INFO_INTERLEAVED |188 SNDRV_PCM_INFO_BATCH |189 SNDRV_PCM_INFO_MMAP_VALID,190 191 .formats = SNDRV_PCM_FMTBIT_S16_LE,192 193 .rates = SNDRV_PCM_RATE_48000,194 195 .rate_min = 48000,196 .rate_max = 48000,197 .channels_min = 2,198 .channels_max = 2,199 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */200 201 /*202 * The period is 12.288 bytes. Allow a 10% of variation along its203 * value, in order to avoid overruns/underruns due to some clock204 * drift.205 *206 * FIXME: This period assumes 64 packets, and a 48000 PCM rate.207 * Calculate it dynamically.208 */209 .period_bytes_min = 11059,210 .period_bytes_max = 13516,211 212 .periods_min = 2,213 .periods_max = 98, /* 12544, */214};215 216static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)217{218 struct em28xx *dev = snd_pcm_substream_chip(substream);219 struct snd_pcm_runtime *runtime = substream->runtime;220 int nonblock, ret = 0;221 222 if (!dev) {223 pr_err("em28xx-audio: BUG: em28xx can't find device struct. Can't proceed with open\n");224 return -ENODEV;225 }226 227 if (dev->disconnected)228 return -ENODEV;229 230 dprintk("opening device and trying to acquire exclusive lock\n");231 232 nonblock = !!(substream->f_flags & O_NONBLOCK);233 if (nonblock) {234 if (!mutex_trylock(&dev->lock))235 return -EAGAIN;236 } else {237 mutex_lock(&dev->lock);238 }239 240 runtime->hw = snd_em28xx_hw_capture;241 242 if (dev->adev.users == 0) {243 if (!dev->alt || dev->is_audio_only) {244 struct usb_device *udev;245 246 udev = interface_to_usbdev(dev->intf);247 248 if (dev->is_audio_only)249 /* audio is on a separate interface */250 dev->alt = 1;251 else252 /* audio is on the same interface as video */253 dev->alt = 7;254 /*255 * FIXME: The intention seems to be to select256 * the alt setting with the largest257 * wMaxPacketSize for the video endpoint.258 * At least dev->alt should be used instead, but259 * we should probably not touch it at all if it260 * is already >0, because wMaxPacketSize of the261 * audio endpoints seems to be the same for all.262 */263 dprintk("changing alternate number on interface %d to %d\n",264 dev->ifnum, dev->alt);265 usb_set_interface(udev, dev->ifnum, dev->alt);266 }267 268 /* Sets volume, mute, etc */269 dev->mute = 0;270 ret = em28xx_audio_analog_set(dev);271 if (ret < 0)272 goto err;273 }274 275 kref_get(&dev->ref);276 dev->adev.users++;277 mutex_unlock(&dev->lock);278 279 /* Dynamically adjust the period size */280 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);281 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,282 dev->adev.period * 95 / 100,283 dev->adev.period * 105 / 100);284 285 dev->adev.capture_pcm_substream = substream;286 287 return 0;288err:289 mutex_unlock(&dev->lock);290 291 dev_err(&dev->intf->dev,292 "Error while configuring em28xx mixer\n");293 return ret;294}295 296static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)297{298 struct em28xx *dev = snd_pcm_substream_chip(substream);299 300 dprintk("closing device\n");301 302 dev->mute = 1;303 mutex_lock(&dev->lock);304 dev->adev.users--;305 if (atomic_read(&dev->adev.stream_started) > 0) {306 atomic_set(&dev->adev.stream_started, 0);307 schedule_work(&dev->adev.wq_trigger);308 }309 310 em28xx_audio_analog_set(dev);311 mutex_unlock(&dev->lock);312 kref_put(&dev->ref, em28xx_free_device);313 314 return 0;315}316 317static int snd_em28xx_prepare(struct snd_pcm_substream *substream)318{319 struct em28xx *dev = snd_pcm_substream_chip(substream);320 321 if (dev->disconnected)322 return -ENODEV;323 324 dev->adev.hwptr_done_capture = 0;325 dev->adev.capture_transfer_done = 0;326 327 return 0;328}329 330static void audio_trigger(struct work_struct *work)331{332 struct em28xx_audio *adev =333 container_of(work, struct em28xx_audio, wq_trigger);334 struct em28xx *dev = container_of(adev, struct em28xx, adev);335 336 if (atomic_read(&adev->stream_started)) {337 dprintk("starting capture");338 em28xx_init_audio_isoc(dev);339 } else {340 dprintk("stopping capture");341 em28xx_deinit_isoc_audio(dev);342 }343}344 345static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,346 int cmd)347{348 struct em28xx *dev = snd_pcm_substream_chip(substream);349 int retval = 0;350 351 if (dev->disconnected)352 return -ENODEV;353 354 switch (cmd) {355 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:356 case SNDRV_PCM_TRIGGER_RESUME:357 case SNDRV_PCM_TRIGGER_START:358 atomic_set(&dev->adev.stream_started, 1);359 break;360 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:361 case SNDRV_PCM_TRIGGER_SUSPEND:362 case SNDRV_PCM_TRIGGER_STOP:363 atomic_set(&dev->adev.stream_started, 0);364 break;365 default:366 retval = -EINVAL;367 }368 schedule_work(&dev->adev.wq_trigger);369 return retval;370}371 372static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream373 *substream)374{375 unsigned long flags;376 struct em28xx *dev;377 snd_pcm_uframes_t hwptr_done;378 379 dev = snd_pcm_substream_chip(substream);380 if (dev->disconnected)381 return SNDRV_PCM_POS_XRUN;382 383 spin_lock_irqsave(&dev->adev.slock, flags);384 hwptr_done = dev->adev.hwptr_done_capture;385 spin_unlock_irqrestore(&dev->adev.slock, flags);386 387 return hwptr_done;388}389 390/*391 * AC97 volume control support392 */393static int em28xx_vol_info(struct snd_kcontrol *kcontrol,394 struct snd_ctl_elem_info *info)395{396 struct em28xx *dev = snd_kcontrol_chip(kcontrol);397 398 if (dev->disconnected)399 return -ENODEV;400 401 info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;402 info->count = 2;403 info->value.integer.min = 0;404 info->value.integer.max = 0x1f;405 406 return 0;407}408 409static int em28xx_vol_put(struct snd_kcontrol *kcontrol,410 struct snd_ctl_elem_value *value)411{412 struct em28xx *dev = snd_kcontrol_chip(kcontrol);413 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;414 u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |415 (0x1f - (value->value.integer.value[1] & 0x1f)) << 8;416 int nonblock = 0;417 int rc;418 419 if (dev->disconnected)420 return -ENODEV;421 422 if (substream)423 nonblock = !!(substream->f_flags & O_NONBLOCK);424 if (nonblock) {425 if (!mutex_trylock(&dev->lock))426 return -EAGAIN;427 } else {428 mutex_lock(&dev->lock);429 }430 rc = em28xx_read_ac97(dev, kcontrol->private_value);431 if (rc < 0)432 goto err;433 434 val |= rc & 0x8000; /* Preserve the mute flag */435 436 rc = em28xx_write_ac97(dev, kcontrol->private_value, val);437 if (rc < 0)438 goto err;439 440 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",441 (val & 0x8000) ? "muted " : "",442 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),443 val, (int)kcontrol->private_value);444 445err:446 mutex_unlock(&dev->lock);447 return rc;448}449 450static int em28xx_vol_get(struct snd_kcontrol *kcontrol,451 struct snd_ctl_elem_value *value)452{453 struct em28xx *dev = snd_kcontrol_chip(kcontrol);454 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;455 int nonblock = 0;456 int val;457 458 if (dev->disconnected)459 return -ENODEV;460 461 if (substream)462 nonblock = !!(substream->f_flags & O_NONBLOCK);463 if (nonblock) {464 if (!mutex_trylock(&dev->lock))465 return -EAGAIN;466 } else {467 mutex_lock(&dev->lock);468 }469 val = em28xx_read_ac97(dev, kcontrol->private_value);470 mutex_unlock(&dev->lock);471 if (val < 0)472 return val;473 474 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",475 (val & 0x8000) ? "muted " : "",476 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),477 val, (int)kcontrol->private_value);478 479 value->value.integer.value[0] = 0x1f - (val & 0x1f);480 value->value.integer.value[1] = 0x1f - ((val >> 8) & 0x1f);481 482 return 0;483}484 485static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,486 struct snd_ctl_elem_value *value)487{488 struct em28xx *dev = snd_kcontrol_chip(kcontrol);489 u16 val = value->value.integer.value[0];490 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;491 int nonblock = 0;492 int rc;493 494 if (dev->disconnected)495 return -ENODEV;496 497 if (substream)498 nonblock = !!(substream->f_flags & O_NONBLOCK);499 if (nonblock) {500 if (!mutex_trylock(&dev->lock))501 return -EAGAIN;502 } else {503 mutex_lock(&dev->lock);504 }505 rc = em28xx_read_ac97(dev, kcontrol->private_value);506 if (rc < 0)507 goto err;508 509 if (val)510 rc &= 0x1f1f;511 else512 rc |= 0x8000;513 514 rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);515 if (rc < 0)516 goto err;517 518 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",519 (val & 0x8000) ? "muted " : "",520 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),521 val, (int)kcontrol->private_value);522 523err:524 mutex_unlock(&dev->lock);525 return rc;526}527 528static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,529 struct snd_ctl_elem_value *value)530{531 struct em28xx *dev = snd_kcontrol_chip(kcontrol);532 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;533 int nonblock = 0;534 int val;535 536 if (dev->disconnected)537 return -ENODEV;538 539 if (substream)540 nonblock = !!(substream->f_flags & O_NONBLOCK);541 if (nonblock) {542 if (!mutex_trylock(&dev->lock))543 return -EAGAIN;544 } else {545 mutex_lock(&dev->lock);546 }547 val = em28xx_read_ac97(dev, kcontrol->private_value);548 mutex_unlock(&dev->lock);549 if (val < 0)550 return val;551 552 if (val & 0x8000)553 value->value.integer.value[0] = 0;554 else555 value->value.integer.value[0] = 1;556 557 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",558 (val & 0x8000) ? "muted " : "",559 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),560 val, (int)kcontrol->private_value);561 562 return 0;563}564 565static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);566 567static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,568 char *name, int id)569{570 int err;571 char ctl_name[44];572 struct snd_kcontrol *kctl;573 struct snd_kcontrol_new tmp;574 575 memset(&tmp, 0, sizeof(tmp));576 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER;577 tmp.private_value = id;578 tmp.name = ctl_name;579 580 /* Add Mute Control */581 sprintf(ctl_name, "%s Switch", name);582 tmp.get = em28xx_vol_get_mute;583 tmp.put = em28xx_vol_put_mute;584 tmp.info = snd_ctl_boolean_mono_info;585 kctl = snd_ctl_new1(&tmp, dev);586 err = snd_ctl_add(card, kctl);587 if (err < 0)588 return err;589 dprintk("Added control %s for ac97 volume control 0x%04x\n",590 ctl_name, id);591 592 memset(&tmp, 0, sizeof(tmp));593 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER;594 tmp.private_value = id;595 tmp.name = ctl_name;596 597 /* Add Volume Control */598 sprintf(ctl_name, "%s Volume", name);599 tmp.get = em28xx_vol_get;600 tmp.put = em28xx_vol_put;601 tmp.info = em28xx_vol_info;602 tmp.tlv.p = em28xx_db_scale;603 kctl = snd_ctl_new1(&tmp, dev);604 err = snd_ctl_add(card, kctl);605 if (err < 0)606 return err;607 dprintk("Added control %s for ac97 volume control 0x%04x\n",608 ctl_name, id);609 610 return 0;611}612 613/*614 * register/unregister code and data615 */616static const struct snd_pcm_ops snd_em28xx_pcm_capture = {617 .open = snd_em28xx_capture_open,618 .close = snd_em28xx_pcm_close,619 .prepare = snd_em28xx_prepare,620 .trigger = snd_em28xx_capture_trigger,621 .pointer = snd_em28xx_capture_pointer,622};623 624static void em28xx_audio_free_urb(struct em28xx *dev)625{626 struct usb_device *udev = interface_to_usbdev(dev->intf);627 int i;628 629 for (i = 0; i < dev->adev.num_urb; i++) {630 struct urb *urb = dev->adev.urb[i];631 632 if (!urb)633 continue;634 635 usb_free_coherent(udev, urb->transfer_buffer_length,636 dev->adev.transfer_buffer[i],637 urb->transfer_dma);638 639 usb_free_urb(urb);640 }641 kfree(dev->adev.urb);642 kfree(dev->adev.transfer_buffer);643 dev->adev.num_urb = 0;644}645 646/* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */647static int em28xx_audio_ep_packet_size(struct usb_device *udev,648 struct usb_endpoint_descriptor *e)649{650 int size = le16_to_cpu(e->wMaxPacketSize);651 652 if (udev->speed == USB_SPEED_HIGH)653 return (size & 0x7ff) * (1 + (((size) >> 11) & 0x03));654 655 return size & 0x7ff;656}657 658static int em28xx_audio_urb_init(struct em28xx *dev)659{660 struct usb_interface *intf;661 struct usb_endpoint_descriptor *e, *ep = NULL;662 struct usb_device *udev = interface_to_usbdev(dev->intf);663 int i, ep_size, interval, num_urb, npackets;664 int urb_size, bytes_per_transfer;665 u8 alt;666 667 if (dev->ifnum)668 alt = 1;669 else670 alt = 7;671 672 intf = usb_ifnum_to_if(udev, dev->ifnum);673 674 if (intf->num_altsetting <= alt) {675 dev_err(&dev->intf->dev, "alt %d doesn't exist on interface %d\n",676 dev->ifnum, alt);677 return -ENODEV;678 }679 680 for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) {681 e = &intf->altsetting[alt].endpoint[i].desc;682 if (!usb_endpoint_dir_in(e))683 continue;684 if (e->bEndpointAddress == EM28XX_EP_AUDIO) {685 ep = e;686 break;687 }688 }689 690 if (!ep) {691 dev_err(&dev->intf->dev, "Couldn't find an audio endpoint");692 return -ENODEV;693 }694 695 ep_size = em28xx_audio_ep_packet_size(udev, ep);696 interval = 1 << (ep->bInterval - 1);697 698 dev_info(&dev->intf->dev,699 "Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n",700 EM28XX_EP_AUDIO, usb_speed_string(udev->speed),701 dev->ifnum, alt, interval, ep_size);702 703 /* Calculate the number and size of URBs to better fit the audio samples */704 705 /*706 * Estimate the number of bytes per DMA transfer.707 *708 * This is given by the bit rate (for now, only 48000 Hz) multiplied709 * by 2 channels and 2 bytes/sample divided by the number of microframe710 * intervals and by the microframe rate (125 us)711 */712 bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval);713 714 /*715 * Estimate the number of transfer URBs. Don't let it go past the716 * maximum number of URBs that is known to be supported by the device.717 */718 num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size);719 if (num_urb > EM28XX_MAX_AUDIO_BUFS)720 num_urb = EM28XX_MAX_AUDIO_BUFS;721 722 /*723 * Now that we know the number of bytes per transfer and the number of724 * URBs, estimate the typical size of an URB, in order to adjust the725 * minimal number of packets.726 */727 urb_size = bytes_per_transfer / num_urb;728 729 /*730 * Now, calculate the amount of audio packets to be filled on each731 * URB. In order to preserve the old behaviour, use a minimal732 * threshold for this value.733 */734 npackets = EM28XX_MIN_AUDIO_PACKETS;735 if (urb_size > ep_size * npackets)736 npackets = DIV_ROUND_UP(urb_size, ep_size);737 738 dev_info(&dev->intf->dev,739 "Number of URBs: %d, with %d packets and %d size\n",740 num_urb, npackets, urb_size);741 742 /* Estimate the bytes per period */743 dev->adev.period = urb_size * npackets;744 745 /* Allocate space to store the number of URBs to be used */746 747 dev->adev.transfer_buffer = kcalloc(num_urb,748 sizeof(*dev->adev.transfer_buffer),749 GFP_KERNEL);750 if (!dev->adev.transfer_buffer)751 return -ENOMEM;752 753 dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_KERNEL);754 if (!dev->adev.urb) {755 kfree(dev->adev.transfer_buffer);756 return -ENOMEM;757 }758 759 /* Alloc memory for each URB and for each transfer buffer */760 dev->adev.num_urb = num_urb;761 for (i = 0; i < num_urb; i++) {762 struct urb *urb;763 int j, k;764 void *buf;765 766 urb = usb_alloc_urb(npackets, GFP_KERNEL);767 if (!urb) {768 em28xx_audio_free_urb(dev);769 return -ENOMEM;770 }771 dev->adev.urb[i] = urb;772 773 buf = usb_alloc_coherent(udev, npackets * ep_size, GFP_KERNEL,774 &urb->transfer_dma);775 if (!buf) {776 dev_err(&dev->intf->dev,777 "usb_alloc_coherent failed!\n");778 em28xx_audio_free_urb(dev);779 return -ENOMEM;780 }781 dev->adev.transfer_buffer[i] = buf;782 783 urb->dev = udev;784 urb->context = dev;785 urb->pipe = usb_rcvisocpipe(udev, EM28XX_EP_AUDIO);786 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;787 urb->transfer_buffer = buf;788 urb->interval = interval;789 urb->complete = em28xx_audio_isocirq;790 urb->number_of_packets = npackets;791 urb->transfer_buffer_length = ep_size * npackets;792 793 for (j = k = 0; j < npackets; j++, k += ep_size) {794 urb->iso_frame_desc[j].offset = k;795 urb->iso_frame_desc[j].length = ep_size;796 }797 }798 799 return 0;800}801 802static int em28xx_audio_init(struct em28xx *dev)803{804 struct em28xx_audio *adev = &dev->adev;805 struct usb_device *udev = interface_to_usbdev(dev->intf);806 struct snd_pcm *pcm;807 struct snd_card *card;808 static int devnr;809 int err;810 811 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {812 /*813 * This device does not support the extension (in this case814 * the device is expecting the snd-usb-audio module or815 * doesn't have analog audio support at all)816 */817 return 0;818 }819 820 dev_info(&dev->intf->dev, "Binding audio extension\n");821 822 kref_get(&dev->ref);823 824 dev_info(&dev->intf->dev,825 "em28xx-audio.c: Copyright (C) 2006 Markus Rechberger\n");826 dev_info(&dev->intf->dev,827 "em28xx-audio.c: Copyright (C) 2007-2016 Mauro Carvalho Chehab\n");828 829 err = snd_card_new(&dev->intf->dev, index[devnr], "Em28xx Audio",830 THIS_MODULE, 0, &card);831 if (err < 0)832 return err;833 834 spin_lock_init(&adev->slock);835 adev->sndcard = card;836 adev->udev = udev;837 838 err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);839 if (err < 0)840 goto card_free;841 842 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);843 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0);844 pcm->info_flags = 0;845 pcm->private_data = dev;846 strscpy(pcm->name, "Empia 28xx Capture", sizeof(pcm->name));847 848 strscpy(card->driver, "Em28xx-Audio", sizeof(card->driver));849 strscpy(card->shortname, "Em28xx Audio", sizeof(card->shortname));850 strscpy(card->longname, "Empia Em28xx Audio", sizeof(card->longname));851 852 INIT_WORK(&adev->wq_trigger, audio_trigger);853 854 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {855 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO);856 em28xx_cvol_new(card, dev, "Line In", AC97_LINE);857 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE);858 em28xx_cvol_new(card, dev, "Microphone", AC97_MIC);859 em28xx_cvol_new(card, dev, "CD", AC97_CD);860 em28xx_cvol_new(card, dev, "AUX", AC97_AUX);861 em28xx_cvol_new(card, dev, "PCM", AC97_PCM);862 863 em28xx_cvol_new(card, dev, "Master", AC97_MASTER);864 em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE);865 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO);866 em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER);867 em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER);868 }869 870 err = em28xx_audio_urb_init(dev);871 if (err)872 goto card_free;873 874 err = snd_card_register(card);875 if (err < 0)876 goto urb_free;877 878 dev_info(&dev->intf->dev, "Audio extension successfully initialized\n");879 return 0;880 881urb_free:882 em28xx_audio_free_urb(dev);883 884card_free:885 snd_card_free(card);886 adev->sndcard = NULL;887 888 return err;889}890 891static int em28xx_audio_fini(struct em28xx *dev)892{893 if (!dev)894 return 0;895 896 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {897 /*898 * This device does not support the extension (in this case899 * the device is expecting the snd-usb-audio module or900 * doesn't have analog audio support at all)901 */902 return 0;903 }904 905 dev_info(&dev->intf->dev, "Closing audio extension\n");906 907 if (dev->adev.sndcard) {908 snd_card_disconnect(dev->adev.sndcard);909 flush_work(&dev->adev.wq_trigger);910 911 em28xx_audio_free_urb(dev);912 913 snd_card_free(dev->adev.sndcard);914 dev->adev.sndcard = NULL;915 }916 917 kref_put(&dev->ref, em28xx_free_device);918 return 0;919}920 921static int em28xx_audio_suspend(struct em28xx *dev)922{923 if (!dev)924 return 0;925 926 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)927 return 0;928 929 dev_info(&dev->intf->dev, "Suspending audio extension\n");930 em28xx_deinit_isoc_audio(dev);931 atomic_set(&dev->adev.stream_started, 0);932 return 0;933}934 935static int em28xx_audio_resume(struct em28xx *dev)936{937 if (!dev)938 return 0;939 940 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)941 return 0;942 943 dev_info(&dev->intf->dev, "Resuming audio extension\n");944 /* Nothing to do other than schedule_work() ?? */945 schedule_work(&dev->adev.wq_trigger);946 return 0;947}948 949static struct em28xx_ops audio_ops = {950 .id = EM28XX_AUDIO,951 .name = "Em28xx Audio Extension",952 .init = em28xx_audio_init,953 .fini = em28xx_audio_fini,954 .suspend = em28xx_audio_suspend,955 .resume = em28xx_audio_resume,956};957 958static int __init em28xx_alsa_register(void)959{960 return em28xx_register_extension(&audio_ops);961}962 963static void __exit em28xx_alsa_unregister(void)964{965 em28xx_unregister_extension(&audio_ops);966}967 968MODULE_LICENSE("GPL v2");969MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");970MODULE_AUTHOR("Mauro Carvalho Chehab");971MODULE_DESCRIPTION(DRIVER_DESC " - audio interface");972MODULE_VERSION(EM28XX_VERSION);973 974module_init(em28xx_alsa_register);975module_exit(em28xx_alsa_unregister);976