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![Alexander Tsoy](/assets/img/avatar_default.png)
MicroBook IIc operates in UAC2 mode by default. This patch addresses several issues with it: - MicroBook II and IIc shares the same USB ID. We can distinguish them by interface class. - MaxPacketsOnly attribute is erroneously set in endpoint descriptors. As a result this card produces noise with all sample rates other than 96 KHz. This also causes issues like IOMMU page faults and other problems with host controller. - Sample rate changes takes more than 2 seconds for this device. Clock validity request returns false during that period, so the clock validity quirk is required. Signed-off-by: Alexander Tsoy <alexander@tsoy.me> Link: https://lore.kernel.org/r/20200229151815.14199-1-alexander@tsoy.me Signed-off-by: Takashi Iwai <tiwai@suse.de>
1843 lines
50 KiB
C
1843 lines
50 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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*/
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/bitrev.h>
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#include <linux/ratelimit.h>
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#include <linux/usb.h>
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#include <linux/usb/audio.h>
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#include <linux/usb/audio-v2.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include "usbaudio.h"
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#include "card.h"
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#include "quirks.h"
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#include "debug.h"
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#include "endpoint.h"
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#include "helper.h"
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#include "pcm.h"
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#include "clock.h"
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#include "power.h"
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#include "media.h"
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#define SUBSTREAM_FLAG_DATA_EP_STARTED 0
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#define SUBSTREAM_FLAG_SYNC_EP_STARTED 1
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/* return the estimated delay based on USB frame counters */
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snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
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unsigned int rate)
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{
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int current_frame_number;
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int frame_diff;
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int est_delay;
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if (!subs->last_delay)
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return 0; /* short path */
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current_frame_number = usb_get_current_frame_number(subs->dev);
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/*
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* HCD implementations use different widths, use lower 8 bits.
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* The delay will be managed up to 256ms, which is more than
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* enough
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*/
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frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
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/* Approximation based on number of samples per USB frame (ms),
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some truncation for 44.1 but the estimate is good enough */
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est_delay = frame_diff * rate / 1000;
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if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
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est_delay = subs->last_delay - est_delay;
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else
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est_delay = subs->last_delay + est_delay;
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if (est_delay < 0)
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est_delay = 0;
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return est_delay;
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}
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/*
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* return the current pcm pointer. just based on the hwptr_done value.
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*/
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static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_usb_substream *subs = substream->runtime->private_data;
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unsigned int hwptr_done;
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if (atomic_read(&subs->stream->chip->shutdown))
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return SNDRV_PCM_POS_XRUN;
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spin_lock(&subs->lock);
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hwptr_done = subs->hwptr_done;
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substream->runtime->delay = snd_usb_pcm_delay(subs,
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substream->runtime->rate);
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spin_unlock(&subs->lock);
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return hwptr_done / (substream->runtime->frame_bits >> 3);
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}
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/*
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* find a matching audio format
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*/
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static struct audioformat *find_format(struct snd_usb_substream *subs)
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{
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struct audioformat *fp;
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struct audioformat *found = NULL;
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int cur_attr = 0, attr;
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list_for_each_entry(fp, &subs->fmt_list, list) {
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if (!(fp->formats & pcm_format_to_bits(subs->pcm_format)))
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continue;
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if (fp->channels != subs->channels)
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continue;
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if (subs->cur_rate < fp->rate_min ||
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subs->cur_rate > fp->rate_max)
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continue;
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if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
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unsigned int i;
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for (i = 0; i < fp->nr_rates; i++)
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if (fp->rate_table[i] == subs->cur_rate)
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break;
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if (i >= fp->nr_rates)
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continue;
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}
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attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
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if (! found) {
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found = fp;
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cur_attr = attr;
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continue;
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}
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/* avoid async out and adaptive in if the other method
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* supports the same format.
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* this is a workaround for the case like
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* M-audio audiophile USB.
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*/
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if (attr != cur_attr) {
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if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
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subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
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(attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
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subs->direction == SNDRV_PCM_STREAM_CAPTURE))
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continue;
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if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
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subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
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(cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
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subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
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found = fp;
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cur_attr = attr;
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continue;
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}
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}
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/* find the format with the largest max. packet size */
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if (fp->maxpacksize > found->maxpacksize) {
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found = fp;
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cur_attr = attr;
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}
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}
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return found;
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}
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static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
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struct usb_host_interface *alts,
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struct audioformat *fmt)
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{
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struct usb_device *dev = chip->dev;
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unsigned int ep;
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unsigned char data[1];
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int err;
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if (get_iface_desc(alts)->bNumEndpoints < 1)
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return -EINVAL;
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ep = get_endpoint(alts, 0)->bEndpointAddress;
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data[0] = 1;
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err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
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USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
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UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
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data, sizeof(data));
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if (err < 0) {
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usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n",
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iface, ep);
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return err;
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}
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return 0;
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}
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static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
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struct usb_host_interface *alts,
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struct audioformat *fmt)
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{
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struct usb_device *dev = chip->dev;
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unsigned char data[1];
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int err;
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data[0] = 1;
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err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
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USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
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UAC2_EP_CS_PITCH << 8, 0,
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data, sizeof(data));
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if (err < 0) {
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usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n",
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iface, fmt->altsetting);
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return err;
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}
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return 0;
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}
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/*
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* initialize the pitch control and sample rate
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*/
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int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
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struct usb_host_interface *alts,
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struct audioformat *fmt)
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{
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/* if endpoint doesn't have pitch control, bail out */
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if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
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return 0;
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switch (fmt->protocol) {
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case UAC_VERSION_1:
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default:
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return init_pitch_v1(chip, iface, alts, fmt);
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case UAC_VERSION_2:
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return init_pitch_v2(chip, iface, alts, fmt);
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}
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}
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static int start_endpoints(struct snd_usb_substream *subs)
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{
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int err;
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if (!subs->data_endpoint)
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return -EINVAL;
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if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
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struct snd_usb_endpoint *ep = subs->data_endpoint;
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dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep);
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ep->data_subs = subs;
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err = snd_usb_endpoint_start(ep);
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if (err < 0) {
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clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
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return err;
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}
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}
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if (subs->sync_endpoint &&
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!test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
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struct snd_usb_endpoint *ep = subs->sync_endpoint;
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if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
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subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) {
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err = usb_set_interface(subs->dev,
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subs->sync_endpoint->iface,
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subs->sync_endpoint->altsetting);
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if (err < 0) {
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clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
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dev_err(&subs->dev->dev,
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"%d:%d: cannot set interface (%d)\n",
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subs->sync_endpoint->iface,
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subs->sync_endpoint->altsetting, err);
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return -EIO;
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}
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}
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dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep);
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ep->sync_slave = subs->data_endpoint;
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err = snd_usb_endpoint_start(ep);
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if (err < 0) {
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clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
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return err;
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}
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}
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return 0;
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}
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static void sync_pending_stops(struct snd_usb_substream *subs)
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{
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snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
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snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
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}
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static void stop_endpoints(struct snd_usb_substream *subs)
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{
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if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
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snd_usb_endpoint_stop(subs->sync_endpoint);
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if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
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snd_usb_endpoint_stop(subs->data_endpoint);
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}
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/* PCM sync_stop callback */
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static int snd_usb_pcm_sync_stop(struct snd_pcm_substream *substream)
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{
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struct snd_usb_substream *subs = substream->runtime->private_data;
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if (!snd_usb_lock_shutdown(subs->stream->chip)) {
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sync_pending_stops(subs);
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snd_usb_unlock_shutdown(subs->stream->chip);
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}
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return 0;
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}
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static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
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unsigned int altsetting,
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struct usb_host_interface **alts,
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unsigned int *ep)
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{
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struct usb_interface *iface;
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struct usb_interface_descriptor *altsd;
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struct usb_endpoint_descriptor *epd;
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iface = usb_ifnum_to_if(dev, ifnum);
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if (!iface || iface->num_altsetting < altsetting + 1)
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return -ENOENT;
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*alts = &iface->altsetting[altsetting];
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altsd = get_iface_desc(*alts);
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if (altsd->bAlternateSetting != altsetting ||
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altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
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(altsd->bInterfaceSubClass != 2 &&
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altsd->bInterfaceProtocol != 2 ) ||
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altsd->bNumEndpoints < 1)
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return -ENOENT;
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epd = get_endpoint(*alts, 0);
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if (!usb_endpoint_is_isoc_in(epd) ||
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(epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
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USB_ENDPOINT_USAGE_IMPLICIT_FB)
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return -ENOENT;
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*ep = epd->bEndpointAddress;
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return 0;
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}
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/* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
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* applies. Returns 1 if a quirk was found.
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*/
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static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
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struct usb_device *dev,
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struct usb_interface_descriptor *altsd,
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unsigned int attr)
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{
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struct usb_host_interface *alts;
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struct usb_interface *iface;
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unsigned int ep;
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unsigned int ifnum;
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/* Implicit feedback sync EPs consumers are always playback EPs */
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if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
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return 0;
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switch (subs->stream->chip->usb_id) {
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case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
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case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
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ep = 0x81;
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ifnum = 3;
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goto add_sync_ep_from_ifnum;
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case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
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case USB_ID(0x0763, 0x2081):
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ep = 0x81;
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ifnum = 2;
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goto add_sync_ep_from_ifnum;
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case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
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ep = 0x86;
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ifnum = 2;
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goto add_sync_ep_from_ifnum;
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case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
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ep = 0x81;
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ifnum = 2;
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goto add_sync_ep_from_ifnum;
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case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
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case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
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ep = 0x81;
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ifnum = 1;
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goto add_sync_ep_from_ifnum;
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case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II/IIc */
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/* MicroBook IIc */
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if (altsd->bInterfaceClass == USB_CLASS_AUDIO)
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return 0;
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/* MicroBook II */
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ep = 0x84;
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ifnum = 0;
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goto add_sync_ep_from_ifnum;
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case USB_ID(0x07fd, 0x0008): /* MOTU M Series */
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ep = 0x81;
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ifnum = 2;
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goto add_sync_ep_from_ifnum;
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case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
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/* BOSS Katana amplifiers do not need quirks */
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return 0;
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}
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if (attr == USB_ENDPOINT_SYNC_ASYNC &&
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altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
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altsd->bInterfaceProtocol == 2 &&
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altsd->bNumEndpoints == 1 &&
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USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
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search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
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altsd->bAlternateSetting,
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&alts, &ep) >= 0) {
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goto add_sync_ep;
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}
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/* No quirk */
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return 0;
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add_sync_ep_from_ifnum:
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iface = usb_ifnum_to_if(dev, ifnum);
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if (!iface || iface->num_altsetting < 2)
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return -EINVAL;
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alts = &iface->altsetting[1];
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add_sync_ep:
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subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
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alts, ep, !subs->direction,
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SND_USB_ENDPOINT_TYPE_DATA);
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if (!subs->sync_endpoint)
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return -EINVAL;
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|
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subs->data_endpoint->sync_master = subs->sync_endpoint;
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return 1;
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}
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|
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static int set_sync_endpoint(struct snd_usb_substream *subs,
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struct audioformat *fmt,
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struct usb_device *dev,
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struct usb_host_interface *alts,
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struct usb_interface_descriptor *altsd)
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{
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int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
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unsigned int ep, attr;
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bool implicit_fb;
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int err;
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|
|
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/* we need a sync pipe in async OUT or adaptive IN mode */
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/* check the number of EP, since some devices have broken
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* descriptors which fool us. if it has only one EP,
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* assume it as adaptive-out or sync-in.
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*/
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attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
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|
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if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
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(!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
|
|
|
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/*
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* In these modes the notion of sync_endpoint is irrelevant.
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* Reset pointers to avoid using stale data from previously
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* used settings, e.g. when configuration and endpoints were
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* changed
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*/
|
|
|
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subs->sync_endpoint = NULL;
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subs->data_endpoint->sync_master = NULL;
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}
|
|
|
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err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
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if (err < 0)
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return err;
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|
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/* endpoint set by quirk */
|
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if (err > 0)
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return 0;
|
|
|
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if (altsd->bNumEndpoints < 2)
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return 0;
|
|
|
|
if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
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attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
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(!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
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return 0;
|
|
|
|
/*
|
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* In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
|
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* if we don't find a sync endpoint, as on M-Audio Transit. In case of
|
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* error fall back to SYNC mode and don't create sync endpoint
|
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*/
|
|
|
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/* check sync-pipe endpoint */
|
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/* ... and check descriptor size before accessing bSynchAddress
|
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because there is a version of the SB Audigy 2 NX firmware lacking
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the audio fields in the endpoint descriptors */
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if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
|
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(get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
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get_endpoint(alts, 1)->bSynchAddress != 0)) {
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|
dev_err(&dev->dev,
|
|
"%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
|
|
fmt->iface, fmt->altsetting,
|
|
get_endpoint(alts, 1)->bmAttributes,
|
|
get_endpoint(alts, 1)->bLength,
|
|
get_endpoint(alts, 1)->bSynchAddress);
|
|
if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
|
|
return 0;
|
|
return -EINVAL;
|
|
}
|
|
ep = get_endpoint(alts, 1)->bEndpointAddress;
|
|
if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
|
|
get_endpoint(alts, 0)->bSynchAddress != 0 &&
|
|
((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
|
|
(!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
|
|
dev_err(&dev->dev,
|
|
"%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
|
|
fmt->iface, fmt->altsetting,
|
|
is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
|
|
if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
|
|
return 0;
|
|
return -EINVAL;
|
|
}
|
|
|
|
implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
|
|
== USB_ENDPOINT_USAGE_IMPLICIT_FB;
|
|
|
|
subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
|
|
alts, ep, !subs->direction,
|
|
implicit_fb ?
|
|
SND_USB_ENDPOINT_TYPE_DATA :
|
|
SND_USB_ENDPOINT_TYPE_SYNC);
|
|
if (!subs->sync_endpoint) {
|
|
if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
|
|
return 0;
|
|
return -EINVAL;
|
|
}
|
|
|
|
subs->data_endpoint->sync_master = subs->sync_endpoint;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* find a matching format and set up the interface
|
|
*/
|
|
static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
|
|
{
|
|
struct usb_device *dev = subs->dev;
|
|
struct usb_host_interface *alts;
|
|
struct usb_interface_descriptor *altsd;
|
|
struct usb_interface *iface;
|
|
int err;
|
|
|
|
iface = usb_ifnum_to_if(dev, fmt->iface);
|
|
if (WARN_ON(!iface))
|
|
return -EINVAL;
|
|
alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
|
|
if (WARN_ON(!alts))
|
|
return -EINVAL;
|
|
altsd = get_iface_desc(alts);
|
|
|
|
if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
|
|
return 0;
|
|
|
|
/* close the old interface */
|
|
if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
|
|
if (!subs->stream->chip->keep_iface) {
|
|
err = usb_set_interface(subs->dev, subs->interface, 0);
|
|
if (err < 0) {
|
|
dev_err(&dev->dev,
|
|
"%d:%d: return to setting 0 failed (%d)\n",
|
|
fmt->iface, fmt->altsetting, err);
|
|
return -EIO;
|
|
}
|
|
}
|
|
subs->interface = -1;
|
|
subs->altset_idx = 0;
|
|
}
|
|
|
|
if (subs->need_setup_fmt)
|
|
subs->need_setup_fmt = false;
|
|
|
|
/* set interface */
|
|
if (iface->cur_altsetting != alts) {
|
|
err = snd_usb_select_mode_quirk(subs, fmt);
|
|
if (err < 0)
|
|
return -EIO;
|
|
|
|
err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
|
|
if (err < 0) {
|
|
dev_err(&dev->dev,
|
|
"%d:%d: usb_set_interface failed (%d)\n",
|
|
fmt->iface, fmt->altsetting, err);
|
|
return -EIO;
|
|
}
|
|
dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
|
|
fmt->iface, fmt->altsetting);
|
|
snd_usb_set_interface_quirk(dev);
|
|
}
|
|
|
|
subs->interface = fmt->iface;
|
|
subs->altset_idx = fmt->altset_idx;
|
|
subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
|
|
alts, fmt->endpoint, subs->direction,
|
|
SND_USB_ENDPOINT_TYPE_DATA);
|
|
|
|
if (!subs->data_endpoint)
|
|
return -EINVAL;
|
|
|
|
err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
subs->cur_audiofmt = fmt;
|
|
|
|
snd_usb_set_format_quirk(subs, fmt);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return the score of matching two audioformats.
|
|
* Veto the audioformat if:
|
|
* - It has no channels for some reason.
|
|
* - Requested PCM format is not supported.
|
|
* - Requested sample rate is not supported.
|
|
*/
|
|
static int match_endpoint_audioformats(struct snd_usb_substream *subs,
|
|
struct audioformat *fp,
|
|
struct audioformat *match, int rate,
|
|
snd_pcm_format_t pcm_format)
|
|
{
|
|
int i;
|
|
int score = 0;
|
|
|
|
if (fp->channels < 1) {
|
|
dev_dbg(&subs->dev->dev,
|
|
"%s: (fmt @%p) no channels\n", __func__, fp);
|
|
return 0;
|
|
}
|
|
|
|
if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
|
|
dev_dbg(&subs->dev->dev,
|
|
"%s: (fmt @%p) no match for format %d\n", __func__,
|
|
fp, pcm_format);
|
|
return 0;
|
|
}
|
|
|
|
for (i = 0; i < fp->nr_rates; i++) {
|
|
if (fp->rate_table[i] == rate) {
|
|
score++;
|
|
break;
|
|
}
|
|
}
|
|
if (!score) {
|
|
dev_dbg(&subs->dev->dev,
|
|
"%s: (fmt @%p) no match for rate %d\n", __func__,
|
|
fp, rate);
|
|
return 0;
|
|
}
|
|
|
|
if (fp->channels == match->channels)
|
|
score++;
|
|
|
|
dev_dbg(&subs->dev->dev,
|
|
"%s: (fmt @%p) score %d\n", __func__, fp, score);
|
|
|
|
return score;
|
|
}
|
|
|
|
/*
|
|
* Configure the sync ep using the rate and pcm format of the data ep.
|
|
*/
|
|
static int configure_sync_endpoint(struct snd_usb_substream *subs)
|
|
{
|
|
int ret;
|
|
struct audioformat *fp;
|
|
struct audioformat *sync_fp = NULL;
|
|
int cur_score = 0;
|
|
int sync_period_bytes = subs->period_bytes;
|
|
struct snd_usb_substream *sync_subs =
|
|
&subs->stream->substream[subs->direction ^ 1];
|
|
|
|
if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
|
|
!subs->stream)
|
|
return snd_usb_endpoint_set_params(subs->sync_endpoint,
|
|
subs->pcm_format,
|
|
subs->channels,
|
|
subs->period_bytes,
|
|
0, 0,
|
|
subs->cur_rate,
|
|
subs->cur_audiofmt,
|
|
NULL);
|
|
|
|
/* Try to find the best matching audioformat. */
|
|
list_for_each_entry(fp, &sync_subs->fmt_list, list) {
|
|
int score = match_endpoint_audioformats(subs,
|
|
fp, subs->cur_audiofmt,
|
|
subs->cur_rate, subs->pcm_format);
|
|
|
|
if (score > cur_score) {
|
|
sync_fp = fp;
|
|
cur_score = score;
|
|
}
|
|
}
|
|
|
|
if (unlikely(sync_fp == NULL)) {
|
|
dev_err(&subs->dev->dev,
|
|
"%s: no valid audioformat for sync ep %x found\n",
|
|
__func__, sync_subs->ep_num);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Recalculate the period bytes if channel number differ between
|
|
* data and sync ep audioformat.
|
|
*/
|
|
if (sync_fp->channels != subs->channels) {
|
|
sync_period_bytes = (subs->period_bytes / subs->channels) *
|
|
sync_fp->channels;
|
|
dev_dbg(&subs->dev->dev,
|
|
"%s: adjusted sync ep period bytes (%d -> %d)\n",
|
|
__func__, subs->period_bytes, sync_period_bytes);
|
|
}
|
|
|
|
ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
|
|
subs->pcm_format,
|
|
sync_fp->channels,
|
|
sync_period_bytes,
|
|
0, 0,
|
|
subs->cur_rate,
|
|
sync_fp,
|
|
NULL);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* configure endpoint params
|
|
*
|
|
* called during initial setup and upon resume
|
|
*/
|
|
static int configure_endpoint(struct snd_usb_substream *subs)
|
|
{
|
|
int ret;
|
|
|
|
/* format changed */
|
|
stop_endpoints(subs);
|
|
sync_pending_stops(subs);
|
|
ret = snd_usb_endpoint_set_params(subs->data_endpoint,
|
|
subs->pcm_format,
|
|
subs->channels,
|
|
subs->period_bytes,
|
|
subs->period_frames,
|
|
subs->buffer_periods,
|
|
subs->cur_rate,
|
|
subs->cur_audiofmt,
|
|
subs->sync_endpoint);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (subs->sync_endpoint)
|
|
ret = configure_sync_endpoint(subs);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
|
|
{
|
|
int ret;
|
|
|
|
if (!subs->str_pd)
|
|
return 0;
|
|
|
|
ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
|
|
if (ret < 0) {
|
|
dev_err(&subs->dev->dev,
|
|
"Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
|
|
subs->str_pd->pd_id, state, ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int snd_usb_pcm_suspend(struct snd_usb_stream *as)
|
|
{
|
|
int ret;
|
|
|
|
ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int snd_usb_pcm_resume(struct snd_usb_stream *as)
|
|
{
|
|
int ret;
|
|
|
|
ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* hw_params callback
|
|
*
|
|
* allocate a buffer and set the given audio format.
|
|
*
|
|
* so far we use a physically linear buffer although packetize transfer
|
|
* doesn't need a continuous area.
|
|
* if sg buffer is supported on the later version of alsa, we'll follow
|
|
* that.
|
|
*/
|
|
static int snd_usb_hw_params(struct snd_pcm_substream *substream,
|
|
struct snd_pcm_hw_params *hw_params)
|
|
{
|
|
struct snd_usb_substream *subs = substream->runtime->private_data;
|
|
struct audioformat *fmt;
|
|
int ret;
|
|
|
|
ret = snd_media_start_pipeline(subs);
|
|
if (ret)
|
|
return ret;
|
|
|
|
subs->pcm_format = params_format(hw_params);
|
|
subs->period_bytes = params_period_bytes(hw_params);
|
|
subs->period_frames = params_period_size(hw_params);
|
|
subs->buffer_periods = params_periods(hw_params);
|
|
subs->channels = params_channels(hw_params);
|
|
subs->cur_rate = params_rate(hw_params);
|
|
|
|
fmt = find_format(subs);
|
|
if (!fmt) {
|
|
dev_dbg(&subs->dev->dev,
|
|
"cannot set format: format = %#x, rate = %d, channels = %d\n",
|
|
subs->pcm_format, subs->cur_rate, subs->channels);
|
|
ret = -EINVAL;
|
|
goto stop_pipeline;
|
|
}
|
|
|
|
ret = snd_usb_lock_shutdown(subs->stream->chip);
|
|
if (ret < 0)
|
|
goto stop_pipeline;
|
|
|
|
ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
|
|
if (ret < 0)
|
|
goto unlock;
|
|
|
|
ret = set_format(subs, fmt);
|
|
if (ret < 0)
|
|
goto unlock;
|
|
|
|
subs->interface = fmt->iface;
|
|
subs->altset_idx = fmt->altset_idx;
|
|
subs->need_setup_ep = true;
|
|
|
|
unlock:
|
|
snd_usb_unlock_shutdown(subs->stream->chip);
|
|
if (ret < 0)
|
|
goto stop_pipeline;
|
|
return ret;
|
|
|
|
stop_pipeline:
|
|
snd_media_stop_pipeline(subs);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* hw_free callback
|
|
*
|
|
* reset the audio format and release the buffer
|
|
*/
|
|
static int snd_usb_hw_free(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_usb_substream *subs = substream->runtime->private_data;
|
|
|
|
snd_media_stop_pipeline(subs);
|
|
subs->cur_audiofmt = NULL;
|
|
subs->cur_rate = 0;
|
|
subs->period_bytes = 0;
|
|
if (!snd_usb_lock_shutdown(subs->stream->chip)) {
|
|
stop_endpoints(subs);
|
|
sync_pending_stops(subs);
|
|
snd_usb_endpoint_deactivate(subs->sync_endpoint);
|
|
snd_usb_endpoint_deactivate(subs->data_endpoint);
|
|
snd_usb_unlock_shutdown(subs->stream->chip);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* prepare callback
|
|
*
|
|
* only a few subtle things...
|
|
*/
|
|
static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct snd_usb_substream *subs = runtime->private_data;
|
|
struct usb_host_interface *alts;
|
|
struct usb_interface *iface;
|
|
int ret;
|
|
|
|
if (! subs->cur_audiofmt) {
|
|
dev_err(&subs->dev->dev, "no format is specified!\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
ret = snd_usb_lock_shutdown(subs->stream->chip);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (snd_BUG_ON(!subs->data_endpoint)) {
|
|
ret = -EIO;
|
|
goto unlock;
|
|
}
|
|
|
|
ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
|
|
if (ret < 0)
|
|
goto unlock;
|
|
|
|
ret = set_format(subs, subs->cur_audiofmt);
|
|
if (ret < 0)
|
|
goto unlock;
|
|
|
|
if (subs->need_setup_ep) {
|
|
|
|
iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
|
|
alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
|
|
ret = snd_usb_init_sample_rate(subs->stream->chip,
|
|
subs->cur_audiofmt->iface,
|
|
alts,
|
|
subs->cur_audiofmt,
|
|
subs->cur_rate);
|
|
if (ret < 0)
|
|
goto unlock;
|
|
|
|
ret = configure_endpoint(subs);
|
|
if (ret < 0)
|
|
goto unlock;
|
|
subs->need_setup_ep = false;
|
|
}
|
|
|
|
/* some unit conversions in runtime */
|
|
subs->data_endpoint->maxframesize =
|
|
bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
|
|
subs->data_endpoint->curframesize =
|
|
bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
|
|
|
|
/* reset the pointer */
|
|
subs->hwptr_done = 0;
|
|
subs->transfer_done = 0;
|
|
subs->last_delay = 0;
|
|
subs->last_frame_number = 0;
|
|
runtime->delay = 0;
|
|
|
|
/* for playback, submit the URBs now; otherwise, the first hwptr_done
|
|
* updates for all URBs would happen at the same time when starting */
|
|
if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
|
|
ret = start_endpoints(subs);
|
|
|
|
unlock:
|
|
snd_usb_unlock_shutdown(subs->stream->chip);
|
|
return ret;
|
|
}
|
|
|
|
static const struct snd_pcm_hardware snd_usb_hardware =
|
|
{
|
|
.info = SNDRV_PCM_INFO_MMAP |
|
|
SNDRV_PCM_INFO_MMAP_VALID |
|
|
SNDRV_PCM_INFO_BATCH |
|
|
SNDRV_PCM_INFO_INTERLEAVED |
|
|
SNDRV_PCM_INFO_BLOCK_TRANSFER |
|
|
SNDRV_PCM_INFO_PAUSE,
|
|
.buffer_bytes_max = 1024 * 1024,
|
|
.period_bytes_min = 64,
|
|
.period_bytes_max = 512 * 1024,
|
|
.periods_min = 2,
|
|
.periods_max = 1024,
|
|
};
|
|
|
|
static int hw_check_valid_format(struct snd_usb_substream *subs,
|
|
struct snd_pcm_hw_params *params,
|
|
struct audioformat *fp)
|
|
{
|
|
struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
|
|
struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
|
|
struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
|
|
struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
|
|
struct snd_mask check_fmts;
|
|
unsigned int ptime;
|
|
|
|
/* check the format */
|
|
snd_mask_none(&check_fmts);
|
|
check_fmts.bits[0] = (u32)fp->formats;
|
|
check_fmts.bits[1] = (u32)(fp->formats >> 32);
|
|
snd_mask_intersect(&check_fmts, fmts);
|
|
if (snd_mask_empty(&check_fmts)) {
|
|
hwc_debug(" > check: no supported format %d\n", fp->format);
|
|
return 0;
|
|
}
|
|
/* check the channels */
|
|
if (fp->channels < ct->min || fp->channels > ct->max) {
|
|
hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
|
|
return 0;
|
|
}
|
|
/* check the rate is within the range */
|
|
if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
|
|
hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
|
|
return 0;
|
|
}
|
|
if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
|
|
hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
|
|
return 0;
|
|
}
|
|
/* check whether the period time is >= the data packet interval */
|
|
if (subs->speed != USB_SPEED_FULL) {
|
|
ptime = 125 * (1 << fp->datainterval);
|
|
if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
|
|
hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
|
|
return 0;
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int hw_rule_rate(struct snd_pcm_hw_params *params,
|
|
struct snd_pcm_hw_rule *rule)
|
|
{
|
|
struct snd_usb_substream *subs = rule->private;
|
|
struct audioformat *fp;
|
|
struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
|
|
unsigned int rmin, rmax;
|
|
int changed;
|
|
|
|
hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
|
|
changed = 0;
|
|
rmin = rmax = 0;
|
|
list_for_each_entry(fp, &subs->fmt_list, list) {
|
|
if (!hw_check_valid_format(subs, params, fp))
|
|
continue;
|
|
if (changed++) {
|
|
if (rmin > fp->rate_min)
|
|
rmin = fp->rate_min;
|
|
if (rmax < fp->rate_max)
|
|
rmax = fp->rate_max;
|
|
} else {
|
|
rmin = fp->rate_min;
|
|
rmax = fp->rate_max;
|
|
}
|
|
}
|
|
|
|
if (!changed) {
|
|
hwc_debug(" --> get empty\n");
|
|
it->empty = 1;
|
|
return -EINVAL;
|
|
}
|
|
|
|
changed = 0;
|
|
if (it->min < rmin) {
|
|
it->min = rmin;
|
|
it->openmin = 0;
|
|
changed = 1;
|
|
}
|
|
if (it->max > rmax) {
|
|
it->max = rmax;
|
|
it->openmax = 0;
|
|
changed = 1;
|
|
}
|
|
if (snd_interval_checkempty(it)) {
|
|
it->empty = 1;
|
|
return -EINVAL;
|
|
}
|
|
hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
|
|
return changed;
|
|
}
|
|
|
|
|
|
static int hw_rule_channels(struct snd_pcm_hw_params *params,
|
|
struct snd_pcm_hw_rule *rule)
|
|
{
|
|
struct snd_usb_substream *subs = rule->private;
|
|
struct audioformat *fp;
|
|
struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
|
|
unsigned int rmin, rmax;
|
|
int changed;
|
|
|
|
hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
|
|
changed = 0;
|
|
rmin = rmax = 0;
|
|
list_for_each_entry(fp, &subs->fmt_list, list) {
|
|
if (!hw_check_valid_format(subs, params, fp))
|
|
continue;
|
|
if (changed++) {
|
|
if (rmin > fp->channels)
|
|
rmin = fp->channels;
|
|
if (rmax < fp->channels)
|
|
rmax = fp->channels;
|
|
} else {
|
|
rmin = fp->channels;
|
|
rmax = fp->channels;
|
|
}
|
|
}
|
|
|
|
if (!changed) {
|
|
hwc_debug(" --> get empty\n");
|
|
it->empty = 1;
|
|
return -EINVAL;
|
|
}
|
|
|
|
changed = 0;
|
|
if (it->min < rmin) {
|
|
it->min = rmin;
|
|
it->openmin = 0;
|
|
changed = 1;
|
|
}
|
|
if (it->max > rmax) {
|
|
it->max = rmax;
|
|
it->openmax = 0;
|
|
changed = 1;
|
|
}
|
|
if (snd_interval_checkempty(it)) {
|
|
it->empty = 1;
|
|
return -EINVAL;
|
|
}
|
|
hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
|
|
return changed;
|
|
}
|
|
|
|
static int hw_rule_format(struct snd_pcm_hw_params *params,
|
|
struct snd_pcm_hw_rule *rule)
|
|
{
|
|
struct snd_usb_substream *subs = rule->private;
|
|
struct audioformat *fp;
|
|
struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
|
|
u64 fbits;
|
|
u32 oldbits[2];
|
|
int changed;
|
|
|
|
hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
|
|
fbits = 0;
|
|
list_for_each_entry(fp, &subs->fmt_list, list) {
|
|
if (!hw_check_valid_format(subs, params, fp))
|
|
continue;
|
|
fbits |= fp->formats;
|
|
}
|
|
|
|
oldbits[0] = fmt->bits[0];
|
|
oldbits[1] = fmt->bits[1];
|
|
fmt->bits[0] &= (u32)fbits;
|
|
fmt->bits[1] &= (u32)(fbits >> 32);
|
|
if (!fmt->bits[0] && !fmt->bits[1]) {
|
|
hwc_debug(" --> get empty\n");
|
|
return -EINVAL;
|
|
}
|
|
changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
|
|
hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
|
|
return changed;
|
|
}
|
|
|
|
static int hw_rule_period_time(struct snd_pcm_hw_params *params,
|
|
struct snd_pcm_hw_rule *rule)
|
|
{
|
|
struct snd_usb_substream *subs = rule->private;
|
|
struct audioformat *fp;
|
|
struct snd_interval *it;
|
|
unsigned char min_datainterval;
|
|
unsigned int pmin;
|
|
int changed;
|
|
|
|
it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
|
|
hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
|
|
min_datainterval = 0xff;
|
|
list_for_each_entry(fp, &subs->fmt_list, list) {
|
|
if (!hw_check_valid_format(subs, params, fp))
|
|
continue;
|
|
min_datainterval = min(min_datainterval, fp->datainterval);
|
|
}
|
|
if (min_datainterval == 0xff) {
|
|
hwc_debug(" --> get empty\n");
|
|
it->empty = 1;
|
|
return -EINVAL;
|
|
}
|
|
pmin = 125 * (1 << min_datainterval);
|
|
changed = 0;
|
|
if (it->min < pmin) {
|
|
it->min = pmin;
|
|
it->openmin = 0;
|
|
changed = 1;
|
|
}
|
|
if (snd_interval_checkempty(it)) {
|
|
it->empty = 1;
|
|
return -EINVAL;
|
|
}
|
|
hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
|
|
return changed;
|
|
}
|
|
|
|
/*
|
|
* If the device supports unusual bit rates, does the request meet these?
|
|
*/
|
|
static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
|
|
struct snd_usb_substream *subs)
|
|
{
|
|
struct audioformat *fp;
|
|
int *rate_list;
|
|
int count = 0, needs_knot = 0;
|
|
int err;
|
|
|
|
kfree(subs->rate_list.list);
|
|
subs->rate_list.list = NULL;
|
|
|
|
list_for_each_entry(fp, &subs->fmt_list, list) {
|
|
if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
|
|
return 0;
|
|
count += fp->nr_rates;
|
|
if (fp->rates & SNDRV_PCM_RATE_KNOT)
|
|
needs_knot = 1;
|
|
}
|
|
if (!needs_knot)
|
|
return 0;
|
|
|
|
subs->rate_list.list = rate_list =
|
|
kmalloc_array(count, sizeof(int), GFP_KERNEL);
|
|
if (!subs->rate_list.list)
|
|
return -ENOMEM;
|
|
subs->rate_list.count = count;
|
|
subs->rate_list.mask = 0;
|
|
count = 0;
|
|
list_for_each_entry(fp, &subs->fmt_list, list) {
|
|
int i;
|
|
for (i = 0; i < fp->nr_rates; i++)
|
|
rate_list[count++] = fp->rate_table[i];
|
|
}
|
|
err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
|
|
&subs->rate_list);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* set up the runtime hardware information.
|
|
*/
|
|
|
|
static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
|
|
{
|
|
struct audioformat *fp;
|
|
unsigned int pt, ptmin;
|
|
int param_period_time_if_needed;
|
|
int err;
|
|
|
|
runtime->hw.formats = subs->formats;
|
|
|
|
runtime->hw.rate_min = 0x7fffffff;
|
|
runtime->hw.rate_max = 0;
|
|
runtime->hw.channels_min = 256;
|
|
runtime->hw.channels_max = 0;
|
|
runtime->hw.rates = 0;
|
|
ptmin = UINT_MAX;
|
|
/* check min/max rates and channels */
|
|
list_for_each_entry(fp, &subs->fmt_list, list) {
|
|
runtime->hw.rates |= fp->rates;
|
|
if (runtime->hw.rate_min > fp->rate_min)
|
|
runtime->hw.rate_min = fp->rate_min;
|
|
if (runtime->hw.rate_max < fp->rate_max)
|
|
runtime->hw.rate_max = fp->rate_max;
|
|
if (runtime->hw.channels_min > fp->channels)
|
|
runtime->hw.channels_min = fp->channels;
|
|
if (runtime->hw.channels_max < fp->channels)
|
|
runtime->hw.channels_max = fp->channels;
|
|
if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
|
|
/* FIXME: there might be more than one audio formats... */
|
|
runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
|
|
fp->frame_size;
|
|
}
|
|
pt = 125 * (1 << fp->datainterval);
|
|
ptmin = min(ptmin, pt);
|
|
}
|
|
|
|
param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
|
|
if (subs->speed == USB_SPEED_FULL)
|
|
/* full speed devices have fixed data packet interval */
|
|
ptmin = 1000;
|
|
if (ptmin == 1000)
|
|
/* if period time doesn't go below 1 ms, no rules needed */
|
|
param_period_time_if_needed = -1;
|
|
|
|
err = snd_pcm_hw_constraint_minmax(runtime,
|
|
SNDRV_PCM_HW_PARAM_PERIOD_TIME,
|
|
ptmin, UINT_MAX);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
|
|
hw_rule_rate, subs,
|
|
SNDRV_PCM_HW_PARAM_FORMAT,
|
|
SNDRV_PCM_HW_PARAM_CHANNELS,
|
|
param_period_time_if_needed,
|
|
-1);
|
|
if (err < 0)
|
|
return err;
|
|
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
|
|
hw_rule_channels, subs,
|
|
SNDRV_PCM_HW_PARAM_FORMAT,
|
|
SNDRV_PCM_HW_PARAM_RATE,
|
|
param_period_time_if_needed,
|
|
-1);
|
|
if (err < 0)
|
|
return err;
|
|
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
|
|
hw_rule_format, subs,
|
|
SNDRV_PCM_HW_PARAM_RATE,
|
|
SNDRV_PCM_HW_PARAM_CHANNELS,
|
|
param_period_time_if_needed,
|
|
-1);
|
|
if (err < 0)
|
|
return err;
|
|
if (param_period_time_if_needed >= 0) {
|
|
err = snd_pcm_hw_rule_add(runtime, 0,
|
|
SNDRV_PCM_HW_PARAM_PERIOD_TIME,
|
|
hw_rule_period_time, subs,
|
|
SNDRV_PCM_HW_PARAM_FORMAT,
|
|
SNDRV_PCM_HW_PARAM_CHANNELS,
|
|
SNDRV_PCM_HW_PARAM_RATE,
|
|
-1);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
err = snd_usb_pcm_check_knot(runtime, subs);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return snd_usb_autoresume(subs->stream->chip);
|
|
}
|
|
|
|
static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
|
|
{
|
|
int direction = substream->stream;
|
|
struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct snd_usb_substream *subs = &as->substream[direction];
|
|
int ret;
|
|
|
|
subs->interface = -1;
|
|
subs->altset_idx = 0;
|
|
runtime->hw = snd_usb_hardware;
|
|
runtime->private_data = subs;
|
|
subs->pcm_substream = substream;
|
|
/* runtime PM is also done there */
|
|
|
|
/* initialize DSD/DOP context */
|
|
subs->dsd_dop.byte_idx = 0;
|
|
subs->dsd_dop.channel = 0;
|
|
subs->dsd_dop.marker = 1;
|
|
|
|
ret = setup_hw_info(runtime, subs);
|
|
if (ret == 0) {
|
|
ret = snd_media_stream_init(subs, as->pcm, direction);
|
|
if (ret)
|
|
snd_usb_autosuspend(subs->stream->chip);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
|
|
{
|
|
int direction = substream->stream;
|
|
struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
|
|
struct snd_usb_substream *subs = &as->substream[direction];
|
|
int ret;
|
|
|
|
snd_media_stop_pipeline(subs);
|
|
|
|
if (!as->chip->keep_iface &&
|
|
subs->interface >= 0 &&
|
|
!snd_usb_lock_shutdown(subs->stream->chip)) {
|
|
usb_set_interface(subs->dev, subs->interface, 0);
|
|
subs->interface = -1;
|
|
ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
|
|
snd_usb_unlock_shutdown(subs->stream->chip);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
subs->pcm_substream = NULL;
|
|
snd_usb_autosuspend(subs->stream->chip);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Since a URB can handle only a single linear buffer, we must use double
|
|
* buffering when the data to be transferred overflows the buffer boundary.
|
|
* To avoid inconsistencies when updating hwptr_done, we use double buffering
|
|
* for all URBs.
|
|
*/
|
|
static void retire_capture_urb(struct snd_usb_substream *subs,
|
|
struct urb *urb)
|
|
{
|
|
struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
|
|
unsigned int stride, frames, bytes, oldptr;
|
|
int i, period_elapsed = 0;
|
|
unsigned long flags;
|
|
unsigned char *cp;
|
|
int current_frame_number;
|
|
|
|
/* read frame number here, update pointer in critical section */
|
|
current_frame_number = usb_get_current_frame_number(subs->dev);
|
|
|
|
stride = runtime->frame_bits >> 3;
|
|
|
|
for (i = 0; i < urb->number_of_packets; i++) {
|
|
cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
|
|
if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
|
|
dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
|
|
i, urb->iso_frame_desc[i].status);
|
|
// continue;
|
|
}
|
|
bytes = urb->iso_frame_desc[i].actual_length;
|
|
frames = bytes / stride;
|
|
if (!subs->txfr_quirk)
|
|
bytes = frames * stride;
|
|
if (bytes % (runtime->sample_bits >> 3) != 0) {
|
|
int oldbytes = bytes;
|
|
bytes = frames * stride;
|
|
dev_warn_ratelimited(&subs->dev->dev,
|
|
"Corrected urb data len. %d->%d\n",
|
|
oldbytes, bytes);
|
|
}
|
|
/* update the current pointer */
|
|
spin_lock_irqsave(&subs->lock, flags);
|
|
oldptr = subs->hwptr_done;
|
|
subs->hwptr_done += bytes;
|
|
if (subs->hwptr_done >= runtime->buffer_size * stride)
|
|
subs->hwptr_done -= runtime->buffer_size * stride;
|
|
frames = (bytes + (oldptr % stride)) / stride;
|
|
subs->transfer_done += frames;
|
|
if (subs->transfer_done >= runtime->period_size) {
|
|
subs->transfer_done -= runtime->period_size;
|
|
period_elapsed = 1;
|
|
}
|
|
/* capture delay is by construction limited to one URB,
|
|
* reset delays here
|
|
*/
|
|
runtime->delay = subs->last_delay = 0;
|
|
|
|
/* realign last_frame_number */
|
|
subs->last_frame_number = current_frame_number;
|
|
subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
|
|
|
|
spin_unlock_irqrestore(&subs->lock, flags);
|
|
/* copy a data chunk */
|
|
if (oldptr + bytes > runtime->buffer_size * stride) {
|
|
unsigned int bytes1 =
|
|
runtime->buffer_size * stride - oldptr;
|
|
memcpy(runtime->dma_area + oldptr, cp, bytes1);
|
|
memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
|
|
} else {
|
|
memcpy(runtime->dma_area + oldptr, cp, bytes);
|
|
}
|
|
}
|
|
|
|
if (period_elapsed)
|
|
snd_pcm_period_elapsed(subs->pcm_substream);
|
|
}
|
|
|
|
static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
|
|
struct urb *urb, unsigned int bytes)
|
|
{
|
|
struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
|
|
unsigned int stride = runtime->frame_bits >> 3;
|
|
unsigned int dst_idx = 0;
|
|
unsigned int src_idx = subs->hwptr_done;
|
|
unsigned int wrap = runtime->buffer_size * stride;
|
|
u8 *dst = urb->transfer_buffer;
|
|
u8 *src = runtime->dma_area;
|
|
u8 marker[] = { 0x05, 0xfa };
|
|
|
|
/*
|
|
* The DSP DOP format defines a way to transport DSD samples over
|
|
* normal PCM data endpoints. It requires stuffing of marker bytes
|
|
* (0x05 and 0xfa, alternating per sample frame), and then expects
|
|
* 2 additional bytes of actual payload. The whole frame is stored
|
|
* LSB.
|
|
*
|
|
* Hence, for a stereo transport, the buffer layout looks like this,
|
|
* where L refers to left channel samples and R to right.
|
|
*
|
|
* L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
|
|
* L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
|
|
* .....
|
|
*
|
|
*/
|
|
|
|
while (bytes--) {
|
|
if (++subs->dsd_dop.byte_idx == 3) {
|
|
/* frame boundary? */
|
|
dst[dst_idx++] = marker[subs->dsd_dop.marker];
|
|
src_idx += 2;
|
|
subs->dsd_dop.byte_idx = 0;
|
|
|
|
if (++subs->dsd_dop.channel % runtime->channels == 0) {
|
|
/* alternate the marker */
|
|
subs->dsd_dop.marker++;
|
|
subs->dsd_dop.marker %= ARRAY_SIZE(marker);
|
|
subs->dsd_dop.channel = 0;
|
|
}
|
|
} else {
|
|
/* stuff the DSD payload */
|
|
int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
|
|
|
|
if (subs->cur_audiofmt->dsd_bitrev)
|
|
dst[dst_idx++] = bitrev8(src[idx]);
|
|
else
|
|
dst[dst_idx++] = src[idx];
|
|
|
|
subs->hwptr_done++;
|
|
}
|
|
}
|
|
if (subs->hwptr_done >= runtime->buffer_size * stride)
|
|
subs->hwptr_done -= runtime->buffer_size * stride;
|
|
}
|
|
|
|
static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
|
|
int offset, int stride, unsigned int bytes)
|
|
{
|
|
struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
|
|
|
|
if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
|
|
/* err, the transferred area goes over buffer boundary. */
|
|
unsigned int bytes1 =
|
|
runtime->buffer_size * stride - subs->hwptr_done;
|
|
memcpy(urb->transfer_buffer + offset,
|
|
runtime->dma_area + subs->hwptr_done, bytes1);
|
|
memcpy(urb->transfer_buffer + offset + bytes1,
|
|
runtime->dma_area, bytes - bytes1);
|
|
} else {
|
|
memcpy(urb->transfer_buffer + offset,
|
|
runtime->dma_area + subs->hwptr_done, bytes);
|
|
}
|
|
subs->hwptr_done += bytes;
|
|
if (subs->hwptr_done >= runtime->buffer_size * stride)
|
|
subs->hwptr_done -= runtime->buffer_size * stride;
|
|
}
|
|
|
|
static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
|
|
struct urb *urb, int stride,
|
|
unsigned int bytes)
|
|
{
|
|
__le32 packet_length;
|
|
int i;
|
|
|
|
/* Put __le32 length descriptor at start of each packet. */
|
|
for (i = 0; i < urb->number_of_packets; i++) {
|
|
unsigned int length = urb->iso_frame_desc[i].length;
|
|
unsigned int offset = urb->iso_frame_desc[i].offset;
|
|
|
|
packet_length = cpu_to_le32(length);
|
|
offset += i * sizeof(packet_length);
|
|
urb->iso_frame_desc[i].offset = offset;
|
|
urb->iso_frame_desc[i].length += sizeof(packet_length);
|
|
memcpy(urb->transfer_buffer + offset,
|
|
&packet_length, sizeof(packet_length));
|
|
copy_to_urb(subs, urb, offset + sizeof(packet_length),
|
|
stride, length);
|
|
}
|
|
/* Adjust transfer size accordingly. */
|
|
bytes += urb->number_of_packets * sizeof(packet_length);
|
|
return bytes;
|
|
}
|
|
|
|
static void prepare_playback_urb(struct snd_usb_substream *subs,
|
|
struct urb *urb)
|
|
{
|
|
struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
|
|
struct snd_usb_endpoint *ep = subs->data_endpoint;
|
|
struct snd_urb_ctx *ctx = urb->context;
|
|
unsigned int counts, frames, bytes;
|
|
int i, stride, period_elapsed = 0;
|
|
unsigned long flags;
|
|
|
|
stride = runtime->frame_bits >> 3;
|
|
|
|
frames = 0;
|
|
urb->number_of_packets = 0;
|
|
spin_lock_irqsave(&subs->lock, flags);
|
|
subs->frame_limit += ep->max_urb_frames;
|
|
for (i = 0; i < ctx->packets; i++) {
|
|
if (ctx->packet_size[i])
|
|
counts = ctx->packet_size[i];
|
|
else
|
|
counts = snd_usb_endpoint_next_packet_size(ep);
|
|
|
|
/* set up descriptor */
|
|
urb->iso_frame_desc[i].offset = frames * ep->stride;
|
|
urb->iso_frame_desc[i].length = counts * ep->stride;
|
|
frames += counts;
|
|
urb->number_of_packets++;
|
|
subs->transfer_done += counts;
|
|
if (subs->transfer_done >= runtime->period_size) {
|
|
subs->transfer_done -= runtime->period_size;
|
|
subs->frame_limit = 0;
|
|
period_elapsed = 1;
|
|
if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
|
|
if (subs->transfer_done > 0) {
|
|
/* FIXME: fill-max mode is not
|
|
* supported yet */
|
|
frames -= subs->transfer_done;
|
|
counts -= subs->transfer_done;
|
|
urb->iso_frame_desc[i].length =
|
|
counts * ep->stride;
|
|
subs->transfer_done = 0;
|
|
}
|
|
i++;
|
|
if (i < ctx->packets) {
|
|
/* add a transfer delimiter */
|
|
urb->iso_frame_desc[i].offset =
|
|
frames * ep->stride;
|
|
urb->iso_frame_desc[i].length = 0;
|
|
urb->number_of_packets++;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
/* finish at the period boundary or after enough frames */
|
|
if ((period_elapsed ||
|
|
subs->transfer_done >= subs->frame_limit) &&
|
|
!snd_usb_endpoint_implicit_feedback_sink(ep))
|
|
break;
|
|
}
|
|
bytes = frames * ep->stride;
|
|
|
|
if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
|
|
subs->cur_audiofmt->dsd_dop)) {
|
|
fill_playback_urb_dsd_dop(subs, urb, bytes);
|
|
} else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
|
|
subs->cur_audiofmt->dsd_bitrev)) {
|
|
/* bit-reverse the bytes */
|
|
u8 *buf = urb->transfer_buffer;
|
|
for (i = 0; i < bytes; i++) {
|
|
int idx = (subs->hwptr_done + i)
|
|
% (runtime->buffer_size * stride);
|
|
buf[i] = bitrev8(runtime->dma_area[idx]);
|
|
}
|
|
|
|
subs->hwptr_done += bytes;
|
|
if (subs->hwptr_done >= runtime->buffer_size * stride)
|
|
subs->hwptr_done -= runtime->buffer_size * stride;
|
|
} else {
|
|
/* usual PCM */
|
|
if (!subs->tx_length_quirk)
|
|
copy_to_urb(subs, urb, 0, stride, bytes);
|
|
else
|
|
bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
|
|
/* bytes is now amount of outgoing data */
|
|
}
|
|
|
|
/* update delay with exact number of samples queued */
|
|
runtime->delay = subs->last_delay;
|
|
runtime->delay += frames;
|
|
subs->last_delay = runtime->delay;
|
|
|
|
/* realign last_frame_number */
|
|
subs->last_frame_number = usb_get_current_frame_number(subs->dev);
|
|
subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
|
|
|
|
if (subs->trigger_tstamp_pending_update) {
|
|
/* this is the first actual URB submitted,
|
|
* update trigger timestamp to reflect actual start time
|
|
*/
|
|
snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
|
|
subs->trigger_tstamp_pending_update = false;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&subs->lock, flags);
|
|
urb->transfer_buffer_length = bytes;
|
|
if (period_elapsed)
|
|
snd_pcm_period_elapsed(subs->pcm_substream);
|
|
}
|
|
|
|
/*
|
|
* process after playback data complete
|
|
* - decrease the delay count again
|
|
*/
|
|
static void retire_playback_urb(struct snd_usb_substream *subs,
|
|
struct urb *urb)
|
|
{
|
|
unsigned long flags;
|
|
struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
|
|
struct snd_usb_endpoint *ep = subs->data_endpoint;
|
|
int processed = urb->transfer_buffer_length / ep->stride;
|
|
int est_delay;
|
|
|
|
/* ignore the delay accounting when procssed=0 is given, i.e.
|
|
* silent payloads are procssed before handling the actual data
|
|
*/
|
|
if (!processed)
|
|
return;
|
|
|
|
spin_lock_irqsave(&subs->lock, flags);
|
|
if (!subs->last_delay)
|
|
goto out; /* short path */
|
|
|
|
est_delay = snd_usb_pcm_delay(subs, runtime->rate);
|
|
/* update delay with exact number of samples played */
|
|
if (processed > subs->last_delay)
|
|
subs->last_delay = 0;
|
|
else
|
|
subs->last_delay -= processed;
|
|
runtime->delay = subs->last_delay;
|
|
|
|
/*
|
|
* Report when delay estimate is off by more than 2ms.
|
|
* The error should be lower than 2ms since the estimate relies
|
|
* on two reads of a counter updated every ms.
|
|
*/
|
|
if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
|
|
dev_dbg_ratelimited(&subs->dev->dev,
|
|
"delay: estimated %d, actual %d\n",
|
|
est_delay, subs->last_delay);
|
|
|
|
if (!subs->running) {
|
|
/* update last_frame_number for delay counting here since
|
|
* prepare_playback_urb won't be called during pause
|
|
*/
|
|
subs->last_frame_number =
|
|
usb_get_current_frame_number(subs->dev) & 0xff;
|
|
}
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&subs->lock, flags);
|
|
}
|
|
|
|
static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
|
|
int cmd)
|
|
{
|
|
struct snd_usb_substream *subs = substream->runtime->private_data;
|
|
|
|
switch (cmd) {
|
|
case SNDRV_PCM_TRIGGER_START:
|
|
subs->trigger_tstamp_pending_update = true;
|
|
/* fall through */
|
|
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
|
|
subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
|
|
subs->data_endpoint->retire_data_urb = retire_playback_urb;
|
|
subs->running = 1;
|
|
return 0;
|
|
case SNDRV_PCM_TRIGGER_STOP:
|
|
stop_endpoints(subs);
|
|
subs->running = 0;
|
|
return 0;
|
|
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
|
|
subs->data_endpoint->prepare_data_urb = NULL;
|
|
/* keep retire_data_urb for delay calculation */
|
|
subs->data_endpoint->retire_data_urb = retire_playback_urb;
|
|
subs->running = 0;
|
|
return 0;
|
|
case SNDRV_PCM_TRIGGER_SUSPEND:
|
|
if (subs->stream->chip->setup_fmt_after_resume_quirk) {
|
|
stop_endpoints(subs);
|
|
subs->need_setup_fmt = true;
|
|
return 0;
|
|
}
|
|
break;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
|
|
int cmd)
|
|
{
|
|
int err;
|
|
struct snd_usb_substream *subs = substream->runtime->private_data;
|
|
|
|
switch (cmd) {
|
|
case SNDRV_PCM_TRIGGER_START:
|
|
err = start_endpoints(subs);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
subs->data_endpoint->retire_data_urb = retire_capture_urb;
|
|
subs->running = 1;
|
|
return 0;
|
|
case SNDRV_PCM_TRIGGER_STOP:
|
|
stop_endpoints(subs);
|
|
subs->running = 0;
|
|
return 0;
|
|
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
|
|
subs->data_endpoint->retire_data_urb = NULL;
|
|
subs->running = 0;
|
|
return 0;
|
|
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
|
|
subs->data_endpoint->retire_data_urb = retire_capture_urb;
|
|
subs->running = 1;
|
|
return 0;
|
|
case SNDRV_PCM_TRIGGER_SUSPEND:
|
|
if (subs->stream->chip->setup_fmt_after_resume_quirk) {
|
|
stop_endpoints(subs);
|
|
subs->need_setup_fmt = true;
|
|
return 0;
|
|
}
|
|
break;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static const struct snd_pcm_ops snd_usb_playback_ops = {
|
|
.open = snd_usb_pcm_open,
|
|
.close = snd_usb_pcm_close,
|
|
.hw_params = snd_usb_hw_params,
|
|
.hw_free = snd_usb_hw_free,
|
|
.prepare = snd_usb_pcm_prepare,
|
|
.trigger = snd_usb_substream_playback_trigger,
|
|
.sync_stop = snd_usb_pcm_sync_stop,
|
|
.pointer = snd_usb_pcm_pointer,
|
|
};
|
|
|
|
static const struct snd_pcm_ops snd_usb_capture_ops = {
|
|
.open = snd_usb_pcm_open,
|
|
.close = snd_usb_pcm_close,
|
|
.hw_params = snd_usb_hw_params,
|
|
.hw_free = snd_usb_hw_free,
|
|
.prepare = snd_usb_pcm_prepare,
|
|
.trigger = snd_usb_substream_capture_trigger,
|
|
.sync_stop = snd_usb_pcm_sync_stop,
|
|
.pointer = snd_usb_pcm_pointer,
|
|
};
|
|
|
|
void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
|
|
{
|
|
const struct snd_pcm_ops *ops;
|
|
|
|
ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
|
|
&snd_usb_playback_ops : &snd_usb_capture_ops;
|
|
snd_pcm_set_ops(pcm, stream, ops);
|
|
}
|
|
|
|
void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
|
|
{
|
|
struct snd_pcm *pcm = subs->stream->pcm;
|
|
struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
|
|
struct device *dev = subs->dev->bus->controller;
|
|
|
|
if (snd_usb_use_vmalloc)
|
|
snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
|
|
NULL, 0, 0);
|
|
else
|
|
snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
|
|
dev, 64*1024, 512*1024);
|
|
}
|