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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /sound/usb/pcm.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'sound/usb/pcm.c')
-rw-r--r--sound/usb/pcm.c1746
1 files changed, 1746 insertions, 0 deletions
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
new file mode 100644
index 000000000..f2c798c45
--- /dev/null
+++ b/sound/usb/pcm.c
@@ -0,0 +1,1746 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ */
+
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/bitrev.h>
+#include <linux/ratelimit.h>
+#include <linux/usb.h>
+#include <linux/usb/audio.h>
+#include <linux/usb/audio-v2.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+
+#include "usbaudio.h"
+#include "card.h"
+#include "quirks.h"
+#include "endpoint.h"
+#include "helper.h"
+#include "pcm.h"
+#include "clock.h"
+#include "power.h"
+#include "media.h"
+#include "implicit.h"
+
+#define SUBSTREAM_FLAG_DATA_EP_STARTED 0
+#define SUBSTREAM_FLAG_SYNC_EP_STARTED 1
+
+/* return the estimated delay based on USB frame counters */
+static snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
+ struct snd_pcm_runtime *runtime)
+{
+ unsigned int current_frame_number;
+ unsigned int frame_diff;
+ int est_delay;
+ int queued;
+
+ if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
+ queued = bytes_to_frames(runtime, subs->inflight_bytes);
+ if (!queued)
+ return 0;
+ } else if (!subs->running) {
+ return 0;
+ }
+
+ current_frame_number = usb_get_current_frame_number(subs->dev);
+ /*
+ * HCD implementations use different widths, use lower 8 bits.
+ * The delay will be managed up to 256ms, which is more than
+ * enough
+ */
+ frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
+
+ /* Approximation based on number of samples per USB frame (ms),
+ some truncation for 44.1 but the estimate is good enough */
+ est_delay = frame_diff * runtime->rate / 1000;
+
+ if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
+ est_delay = queued - est_delay;
+ if (est_delay < 0)
+ est_delay = 0;
+ }
+
+ return est_delay;
+}
+
+/*
+ * return the current pcm pointer. just based on the hwptr_done value.
+ */
+static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct snd_usb_substream *subs = runtime->private_data;
+ unsigned int hwptr_done;
+
+ if (atomic_read(&subs->stream->chip->shutdown))
+ return SNDRV_PCM_POS_XRUN;
+ spin_lock(&subs->lock);
+ hwptr_done = subs->hwptr_done;
+ runtime->delay = snd_usb_pcm_delay(subs, runtime);
+ spin_unlock(&subs->lock);
+ return bytes_to_frames(runtime, hwptr_done);
+}
+
+/*
+ * find a matching audio format
+ */
+static const struct audioformat *
+find_format(struct list_head *fmt_list_head, snd_pcm_format_t format,
+ unsigned int rate, unsigned int channels, bool strict_match,
+ struct snd_usb_substream *subs)
+{
+ const struct audioformat *fp;
+ const struct audioformat *found = NULL;
+ int cur_attr = 0, attr;
+
+ list_for_each_entry(fp, fmt_list_head, list) {
+ if (strict_match) {
+ if (!(fp->formats & pcm_format_to_bits(format)))
+ continue;
+ if (fp->channels != channels)
+ continue;
+ }
+ if (rate < fp->rate_min || rate > fp->rate_max)
+ continue;
+ if (!(fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
+ unsigned int i;
+ for (i = 0; i < fp->nr_rates; i++)
+ if (fp->rate_table[i] == rate)
+ break;
+ if (i >= fp->nr_rates)
+ continue;
+ }
+ attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
+ if (!found) {
+ found = fp;
+ cur_attr = attr;
+ continue;
+ }
+ /* avoid async out and adaptive in if the other method
+ * supports the same format.
+ * this is a workaround for the case like
+ * M-audio audiophile USB.
+ */
+ if (subs && attr != cur_attr) {
+ if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
+ subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
+ (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
+ subs->direction == SNDRV_PCM_STREAM_CAPTURE))
+ continue;
+ if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
+ subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
+ (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
+ subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
+ found = fp;
+ cur_attr = attr;
+ continue;
+ }
+ }
+ /* find the format with the largest max. packet size */
+ if (fp->maxpacksize > found->maxpacksize) {
+ found = fp;
+ cur_attr = attr;
+ }
+ }
+ return found;
+}
+
+static const struct audioformat *
+find_substream_format(struct snd_usb_substream *subs,
+ const struct snd_pcm_hw_params *params)
+{
+ return find_format(&subs->fmt_list, params_format(params),
+ params_rate(params), params_channels(params),
+ true, subs);
+}
+
+bool snd_usb_pcm_has_fixed_rate(struct snd_usb_substream *subs)
+{
+ const struct audioformat *fp;
+ struct snd_usb_audio *chip;
+ int rate = -1;
+
+ if (!subs)
+ return false;
+ chip = subs->stream->chip;
+ if (!(chip->quirk_flags & QUIRK_FLAG_FIXED_RATE))
+ return false;
+ list_for_each_entry(fp, &subs->fmt_list, list) {
+ if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
+ return false;
+ if (fp->nr_rates < 1)
+ continue;
+ if (fp->nr_rates > 1)
+ return false;
+ if (rate < 0) {
+ rate = fp->rate_table[0];
+ continue;
+ }
+ if (rate != fp->rate_table[0])
+ return false;
+ }
+ return true;
+}
+
+static int init_pitch_v1(struct snd_usb_audio *chip, int ep)
+{
+ struct usb_device *dev = chip->dev;
+ unsigned char data[1];
+ int err;
+
+ data[0] = 1;
+ err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
+ USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
+ UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
+ data, sizeof(data));
+ return err;
+}
+
+static int init_pitch_v2(struct snd_usb_audio *chip, int ep)
+{
+ struct usb_device *dev = chip->dev;
+ unsigned char data[1];
+ int err;
+
+ data[0] = 1;
+ err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
+ USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
+ UAC2_EP_CS_PITCH << 8, 0,
+ data, sizeof(data));
+ return err;
+}
+
+/*
+ * initialize the pitch control and sample rate
+ */
+int snd_usb_init_pitch(struct snd_usb_audio *chip,
+ const struct audioformat *fmt)
+{
+ int err;
+
+ /* if endpoint doesn't have pitch control, bail out */
+ if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
+ return 0;
+
+ usb_audio_dbg(chip, "enable PITCH for EP 0x%x\n", fmt->endpoint);
+
+ switch (fmt->protocol) {
+ case UAC_VERSION_1:
+ err = init_pitch_v1(chip, fmt->endpoint);
+ break;
+ case UAC_VERSION_2:
+ err = init_pitch_v2(chip, fmt->endpoint);
+ break;
+ default:
+ return 0;
+ }
+
+ if (err < 0) {
+ usb_audio_err(chip, "failed to enable PITCH for EP 0x%x\n",
+ fmt->endpoint);
+ return err;
+ }
+
+ return 0;
+}
+
+static bool stop_endpoints(struct snd_usb_substream *subs, bool keep_pending)
+{
+ bool stopped = 0;
+
+ if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
+ snd_usb_endpoint_stop(subs->sync_endpoint, keep_pending);
+ stopped = true;
+ }
+ if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
+ snd_usb_endpoint_stop(subs->data_endpoint, keep_pending);
+ stopped = true;
+ }
+ return stopped;
+}
+
+static int start_endpoints(struct snd_usb_substream *subs)
+{
+ int err;
+
+ if (!subs->data_endpoint)
+ return -EINVAL;
+
+ if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
+ err = snd_usb_endpoint_start(subs->data_endpoint);
+ if (err < 0) {
+ clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
+ goto error;
+ }
+ }
+
+ if (subs->sync_endpoint &&
+ !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
+ err = snd_usb_endpoint_start(subs->sync_endpoint);
+ if (err < 0) {
+ clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
+ goto error;
+ }
+ }
+
+ return 0;
+
+ error:
+ stop_endpoints(subs, false);
+ return err;
+}
+
+static void sync_pending_stops(struct snd_usb_substream *subs)
+{
+ snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
+ snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
+}
+
+/* PCM sync_stop callback */
+static int snd_usb_pcm_sync_stop(struct snd_pcm_substream *substream)
+{
+ struct snd_usb_substream *subs = substream->runtime->private_data;
+
+ sync_pending_stops(subs);
+ return 0;
+}
+
+/* Set up sync endpoint */
+int snd_usb_audioformat_set_sync_ep(struct snd_usb_audio *chip,
+ struct audioformat *fmt)
+{
+ struct usb_device *dev = chip->dev;
+ struct usb_host_interface *alts;
+ struct usb_interface_descriptor *altsd;
+ unsigned int ep, attr, sync_attr;
+ bool is_playback;
+ int err;
+
+ if (fmt->sync_ep)
+ return 0; /* already set up */
+
+ alts = snd_usb_get_host_interface(chip, fmt->iface, fmt->altsetting);
+ if (!alts)
+ return 0;
+ altsd = get_iface_desc(alts);
+
+ err = snd_usb_parse_implicit_fb_quirk(chip, fmt, alts);
+ if (err > 0)
+ return 0; /* matched */
+
+ /*
+ * Generic sync EP handling
+ */
+
+ if (fmt->ep_idx > 0 || altsd->bNumEndpoints < 2)
+ return 0;
+
+ is_playback = !(get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN);
+ attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
+ if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
+ attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
+ (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
+ return 0;
+
+ sync_attr = get_endpoint(alts, 1)->bmAttributes;
+
+ /*
+ * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
+ * if we don't find a sync endpoint, as on M-Audio Transit. In case of
+ * error fall back to SYNC mode and don't create sync endpoint
+ */
+
+ /* check sync-pipe endpoint */
+ /* ... and check descriptor size before accessing bSynchAddress
+ because there is a version of the SB Audigy 2 NX firmware lacking
+ the audio fields in the endpoint descriptors */
+ if ((sync_attr & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
+ (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
+ get_endpoint(alts, 1)->bSynchAddress != 0)) {
+ 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;
+ }
+
+ fmt->sync_ep = ep;
+ fmt->sync_iface = altsd->bInterfaceNumber;
+ fmt->sync_altsetting = altsd->bAlternateSetting;
+ fmt->sync_ep_idx = 1;
+ if ((sync_attr & USB_ENDPOINT_USAGE_MASK) == USB_ENDPOINT_USAGE_IMPLICIT_FB)
+ fmt->implicit_fb = 1;
+
+ dev_dbg(&dev->dev, "%d:%d: found sync_ep=0x%x, iface=%d, alt=%d, implicit_fb=%d\n",
+ fmt->iface, fmt->altsetting, fmt->sync_ep, fmt->sync_iface,
+ fmt->sync_altsetting, fmt->implicit_fb);
+
+ return 0;
+}
+
+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;
+}
+
+static void close_endpoints(struct snd_usb_audio *chip,
+ struct snd_usb_substream *subs)
+{
+ if (subs->data_endpoint) {
+ snd_usb_endpoint_set_sync(chip, subs->data_endpoint, NULL);
+ snd_usb_endpoint_close(chip, subs->data_endpoint);
+ subs->data_endpoint = NULL;
+ }
+
+ if (subs->sync_endpoint) {
+ snd_usb_endpoint_close(chip, subs->sync_endpoint);
+ subs->sync_endpoint = NULL;
+ }
+}
+
+/*
+ * 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 snd_usb_audio *chip = subs->stream->chip;
+ const struct audioformat *fmt;
+ const struct audioformat *sync_fmt;
+ bool fixed_rate, sync_fixed_rate;
+ int ret;
+
+ ret = snd_media_start_pipeline(subs);
+ if (ret)
+ return ret;
+
+ fixed_rate = snd_usb_pcm_has_fixed_rate(subs);
+ fmt = find_substream_format(subs, hw_params);
+ if (!fmt) {
+ usb_audio_dbg(chip,
+ "cannot find format: format=%s, rate=%d, channels=%d\n",
+ snd_pcm_format_name(params_format(hw_params)),
+ params_rate(hw_params), params_channels(hw_params));
+ ret = -EINVAL;
+ goto stop_pipeline;
+ }
+
+ if (fmt->implicit_fb) {
+ sync_fmt = snd_usb_find_implicit_fb_sync_format(chip, fmt,
+ hw_params,
+ !substream->stream,
+ &sync_fixed_rate);
+ if (!sync_fmt) {
+ usb_audio_dbg(chip,
+ "cannot find sync format: ep=0x%x, iface=%d:%d, format=%s, rate=%d, channels=%d\n",
+ fmt->sync_ep, fmt->sync_iface,
+ fmt->sync_altsetting,
+ snd_pcm_format_name(params_format(hw_params)),
+ params_rate(hw_params), params_channels(hw_params));
+ ret = -EINVAL;
+ goto stop_pipeline;
+ }
+ } else {
+ sync_fmt = fmt;
+ sync_fixed_rate = fixed_rate;
+ }
+
+ ret = snd_usb_lock_shutdown(chip);
+ if (ret < 0)
+ goto stop_pipeline;
+
+ ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
+ if (ret < 0)
+ goto unlock;
+
+ if (subs->data_endpoint) {
+ if (snd_usb_endpoint_compatible(chip, subs->data_endpoint,
+ fmt, hw_params))
+ goto unlock;
+ if (stop_endpoints(subs, false))
+ sync_pending_stops(subs);
+ close_endpoints(chip, subs);
+ }
+
+ subs->data_endpoint = snd_usb_endpoint_open(chip, fmt, hw_params, false, fixed_rate);
+ if (!subs->data_endpoint) {
+ ret = -EINVAL;
+ goto unlock;
+ }
+
+ if (fmt->sync_ep) {
+ subs->sync_endpoint = snd_usb_endpoint_open(chip, sync_fmt,
+ hw_params,
+ fmt == sync_fmt,
+ sync_fixed_rate);
+ if (!subs->sync_endpoint) {
+ ret = -EINVAL;
+ goto unlock;
+ }
+
+ snd_usb_endpoint_set_sync(chip, subs->data_endpoint,
+ subs->sync_endpoint);
+ }
+
+ mutex_lock(&chip->mutex);
+ subs->cur_audiofmt = fmt;
+ mutex_unlock(&chip->mutex);
+
+ if (!subs->data_endpoint->need_setup)
+ goto unlock;
+
+ if (subs->sync_endpoint) {
+ ret = snd_usb_endpoint_set_params(chip, subs->sync_endpoint);
+ if (ret < 0)
+ goto unlock;
+ }
+
+ ret = snd_usb_endpoint_set_params(chip, subs->data_endpoint);
+
+ unlock:
+ if (ret < 0)
+ close_endpoints(chip, subs);
+
+ snd_usb_unlock_shutdown(chip);
+ stop_pipeline:
+ if (ret < 0)
+ 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;
+ struct snd_usb_audio *chip = subs->stream->chip;
+
+ snd_media_stop_pipeline(subs);
+ mutex_lock(&chip->mutex);
+ subs->cur_audiofmt = NULL;
+ mutex_unlock(&chip->mutex);
+ if (!snd_usb_lock_shutdown(chip)) {
+ if (stop_endpoints(subs, false))
+ sync_pending_stops(subs);
+ close_endpoints(chip, subs);
+ snd_usb_unlock_shutdown(chip);
+ }
+
+ return 0;
+}
+
+/* free-wheeling mode? (e.g. dmix) */
+static int in_free_wheeling_mode(struct snd_pcm_runtime *runtime)
+{
+ return runtime->stop_threshold > runtime->buffer_size;
+}
+
+/* check whether early start is needed for playback stream */
+static int lowlatency_playback_available(struct snd_pcm_runtime *runtime,
+ struct snd_usb_substream *subs)
+{
+ struct snd_usb_audio *chip = subs->stream->chip;
+
+ if (subs->direction == SNDRV_PCM_STREAM_CAPTURE)
+ return false;
+ /* disabled via module option? */
+ if (!chip->lowlatency)
+ return false;
+ if (in_free_wheeling_mode(runtime))
+ return false;
+ /* implicit feedback mode has own operation mode */
+ if (snd_usb_endpoint_implicit_feedback_sink(subs->data_endpoint))
+ return false;
+ return true;
+}
+
+/*
+ * 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 snd_usb_audio *chip = subs->stream->chip;
+ int retry = 0;
+ int ret;
+
+ ret = snd_usb_lock_shutdown(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;
+
+ again:
+ if (subs->sync_endpoint) {
+ ret = snd_usb_endpoint_prepare(chip, subs->sync_endpoint);
+ if (ret < 0)
+ goto unlock;
+ }
+
+ ret = snd_usb_endpoint_prepare(chip, subs->data_endpoint);
+ if (ret < 0)
+ goto unlock;
+ else if (ret > 0)
+ snd_usb_set_format_quirk(subs, subs->cur_audiofmt);
+ ret = 0;
+
+ /* reset the pointer */
+ subs->buffer_bytes = frames_to_bytes(runtime, runtime->buffer_size);
+ subs->inflight_bytes = 0;
+ subs->hwptr_done = 0;
+ subs->transfer_done = 0;
+ subs->last_frame_number = 0;
+ subs->period_elapsed_pending = 0;
+ runtime->delay = 0;
+
+ subs->lowlatency_playback = lowlatency_playback_available(runtime, subs);
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
+ !subs->lowlatency_playback) {
+ ret = start_endpoints(subs);
+ /* if XRUN happens at starting streams (possibly with implicit
+ * fb case), restart again, but only try once.
+ */
+ if (ret == -EPIPE && !retry++) {
+ sync_pending_stops(subs);
+ goto again;
+ }
+ }
+ unlock:
+ snd_usb_unlock_shutdown(chip);
+ return ret;
+}
+
+/*
+ * h/w constraints
+ */
+
+#ifdef HW_CONST_DEBUG
+#define hwc_debug(fmt, args...) pr_debug(fmt, ##args)
+#else
+#define hwc_debug(fmt, args...) do { } while(0)
+#endif
+
+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,
+ .channels_min = 1,
+ .channels_max = 256,
+ .buffer_bytes_max = INT_MAX, /* limited by BUFFER_TIME later */
+ .period_bytes_min = 64,
+ .period_bytes_max = INT_MAX, /* limited by PERIOD_TIME later */
+ .periods_min = 2,
+ .periods_max = 1024,
+};
+
+static int hw_check_valid_format(struct snd_usb_substream *subs,
+ struct snd_pcm_hw_params *params,
+ const 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 0x%llx\n", fp->formats);
+ 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 apply_hw_params_minmax(struct snd_interval *it, unsigned int rmin,
+ unsigned int rmax)
+{
+ int changed;
+
+ if (rmin > rmax) {
+ 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_rate(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ struct snd_usb_substream *subs = rule->private;
+ struct snd_usb_audio *chip = subs->stream->chip;
+ const struct audioformat *fp;
+ struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
+ unsigned int rmin, rmax, r;
+ int i;
+
+ hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
+ rmin = UINT_MAX;
+ rmax = 0;
+ list_for_each_entry(fp, &subs->fmt_list, list) {
+ if (!hw_check_valid_format(subs, params, fp))
+ continue;
+ r = snd_usb_endpoint_get_clock_rate(chip, fp->clock);
+ if (r > 0) {
+ if (!snd_interval_test(it, r))
+ continue;
+ rmin = min(rmin, r);
+ rmax = max(rmax, r);
+ continue;
+ }
+ if (fp->rate_table && fp->nr_rates) {
+ for (i = 0; i < fp->nr_rates; i++) {
+ r = fp->rate_table[i];
+ if (!snd_interval_test(it, r))
+ continue;
+ rmin = min(rmin, r);
+ rmax = max(rmax, r);
+ }
+ } else {
+ rmin = min(rmin, fp->rate_min);
+ rmax = max(rmax, fp->rate_max);
+ }
+ }
+
+ return apply_hw_params_minmax(it, rmin, rmax);
+}
+
+
+static int hw_rule_channels(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ struct snd_usb_substream *subs = rule->private;
+ const struct audioformat *fp;
+ struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
+ unsigned int rmin, rmax;
+
+ hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
+ rmin = UINT_MAX;
+ rmax = 0;
+ list_for_each_entry(fp, &subs->fmt_list, list) {
+ if (!hw_check_valid_format(subs, params, fp))
+ continue;
+ rmin = min(rmin, fp->channels);
+ rmax = max(rmax, fp->channels);
+ }
+
+ return apply_hw_params_minmax(it, rmin, rmax);
+}
+
+static int apply_hw_params_format_bits(struct snd_mask *fmt, u64 fbits)
+{
+ u32 oldbits[2];
+ int changed;
+
+ 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_format(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ struct snd_usb_substream *subs = rule->private;
+ const struct audioformat *fp;
+ struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
+ u64 fbits;
+
+ 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;
+ }
+ return apply_hw_params_format_bits(fmt, fbits);
+}
+
+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;
+ const struct audioformat *fp;
+ struct snd_interval *it;
+ unsigned char min_datainterval;
+ unsigned int pmin;
+
+ 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);
+
+ return apply_hw_params_minmax(it, pmin, UINT_MAX);
+}
+
+/* get the EP or the sync EP for implicit fb when it's already set up */
+static const struct snd_usb_endpoint *
+get_sync_ep_from_substream(struct snd_usb_substream *subs)
+{
+ struct snd_usb_audio *chip = subs->stream->chip;
+ const struct audioformat *fp;
+ const struct snd_usb_endpoint *ep;
+
+ list_for_each_entry(fp, &subs->fmt_list, list) {
+ ep = snd_usb_get_endpoint(chip, fp->endpoint);
+ if (ep && ep->cur_audiofmt) {
+ /* if EP is already opened solely for this substream,
+ * we still allow us to change the parameter; otherwise
+ * this substream has to follow the existing parameter
+ */
+ if (ep->cur_audiofmt != subs->cur_audiofmt || ep->opened > 1)
+ return ep;
+ }
+ if (!fp->implicit_fb)
+ continue;
+ /* for the implicit fb, check the sync ep as well */
+ ep = snd_usb_get_endpoint(chip, fp->sync_ep);
+ if (ep && ep->cur_audiofmt) {
+ /* ditto, if the sync (data) ep is used by others,
+ * this stream is restricted by the sync ep
+ */
+ if (ep != subs->sync_endpoint || ep->opened > 1)
+ return ep;
+ }
+ }
+ return NULL;
+}
+
+/* additional hw constraints for implicit feedback mode */
+static int hw_rule_format_implicit_fb(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ struct snd_usb_substream *subs = rule->private;
+ const struct snd_usb_endpoint *ep;
+ struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
+
+ ep = get_sync_ep_from_substream(subs);
+ if (!ep)
+ return 0;
+
+ hwc_debug("applying %s\n", __func__);
+ return apply_hw_params_format_bits(fmt, pcm_format_to_bits(ep->cur_format));
+}
+
+static int hw_rule_rate_implicit_fb(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ struct snd_usb_substream *subs = rule->private;
+ const struct snd_usb_endpoint *ep;
+ struct snd_interval *it;
+
+ ep = get_sync_ep_from_substream(subs);
+ if (!ep)
+ return 0;
+
+ hwc_debug("applying %s\n", __func__);
+ it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
+ return apply_hw_params_minmax(it, ep->cur_rate, ep->cur_rate);
+}
+
+static int hw_rule_period_size_implicit_fb(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ struct snd_usb_substream *subs = rule->private;
+ const struct snd_usb_endpoint *ep;
+ struct snd_interval *it;
+
+ ep = get_sync_ep_from_substream(subs);
+ if (!ep)
+ return 0;
+
+ hwc_debug("applying %s\n", __func__);
+ it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
+ return apply_hw_params_minmax(it, ep->cur_period_frames,
+ ep->cur_period_frames);
+}
+
+static int hw_rule_periods_implicit_fb(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ struct snd_usb_substream *subs = rule->private;
+ const struct snd_usb_endpoint *ep;
+ struct snd_interval *it;
+
+ ep = get_sync_ep_from_substream(subs);
+ if (!ep)
+ return 0;
+
+ hwc_debug("applying %s\n", __func__);
+ it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIODS);
+ return apply_hw_params_minmax(it, ep->cur_buffer_periods,
+ ep->cur_buffer_periods);
+}
+
+/*
+ * set up the runtime hardware information.
+ */
+
+static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
+{
+ const struct audioformat *fp;
+ unsigned int pt, ptmin;
+ int param_period_time_if_needed = -1;
+ 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_RATE,
+ 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_CHANNELS,
+ 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_FORMAT,
+ 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;
+ }
+
+ /* set max period and buffer sizes for 1 and 2 seconds, respectively */
+ err = snd_pcm_hw_constraint_minmax(runtime,
+ SNDRV_PCM_HW_PARAM_PERIOD_TIME,
+ 0, 1000000);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_constraint_minmax(runtime,
+ SNDRV_PCM_HW_PARAM_BUFFER_TIME,
+ 0, 2000000);
+ if (err < 0)
+ return err;
+
+ /* additional hw constraints for implicit fb */
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
+ hw_rule_format_implicit_fb, subs,
+ SNDRV_PCM_HW_PARAM_FORMAT, -1);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
+ hw_rule_rate_implicit_fb, subs,
+ SNDRV_PCM_HW_PARAM_RATE, -1);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
+ hw_rule_period_size_implicit_fb, subs,
+ SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
+ hw_rule_periods_implicit_fb, subs,
+ SNDRV_PCM_HW_PARAM_PERIODS, -1);
+ if (err < 0)
+ return err;
+
+ list_for_each_entry(fp, &subs->fmt_list, list) {
+ if (fp->implicit_fb) {
+ runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
+ break;
+ }
+ }
+
+ return 0;
+}
+
+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;
+
+ runtime->hw = snd_usb_hardware;
+ /* need an explicit sync to catch applptr update in low-latency mode */
+ if (direction == SNDRV_PCM_STREAM_PLAYBACK &&
+ as->chip->lowlatency)
+ runtime->hw.info |= SNDRV_PCM_INFO_SYNC_APPLPTR;
+ 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)
+ return ret;
+ ret = snd_usb_autoresume(subs->stream->chip);
+ if (ret < 0)
+ return ret;
+ ret = snd_media_stream_init(subs, as->pcm, direction);
+ if (ret < 0)
+ 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 (!snd_usb_lock_shutdown(subs->stream->chip)) {
+ 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;
+ if (subs->stream_offset_adj > 0) {
+ unsigned int adj = min(subs->stream_offset_adj, bytes);
+ cp += adj;
+ bytes -= adj;
+ subs->stream_offset_adj -= adj;
+ }
+ 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 >= subs->buffer_bytes)
+ subs->hwptr_done -= subs->buffer_bytes;
+ 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;
+ }
+
+ /* realign last_frame_number */
+ subs->last_frame_number = current_frame_number;
+
+ spin_unlock_irqrestore(&subs->lock, flags);
+ /* copy a data chunk */
+ if (oldptr + bytes > subs->buffer_bytes) {
+ unsigned int bytes1 = subs->buffer_bytes - 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 void urb_ctx_queue_advance(struct snd_usb_substream *subs,
+ struct urb *urb, unsigned int bytes)
+{
+ struct snd_urb_ctx *ctx = urb->context;
+
+ ctx->queued += bytes;
+ subs->inflight_bytes += bytes;
+ subs->hwptr_done += bytes;
+ if (subs->hwptr_done >= subs->buffer_bytes)
+ subs->hwptr_done -= subs->buffer_bytes;
+}
+
+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 dst_idx = 0;
+ unsigned int src_idx = subs->hwptr_done;
+ unsigned int wrap = subs->buffer_bytes;
+ u8 *dst = urb->transfer_buffer;
+ u8 *src = runtime->dma_area;
+ static const u8 marker[] = { 0x05, 0xfa };
+ unsigned int queued = 0;
+
+ /*
+ * 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];
+ queued++;
+ }
+ }
+
+ urb_ctx_queue_advance(subs, urb, queued);
+}
+
+/* copy bit-reversed bytes onto transfer buffer */
+static void fill_playback_urb_dsd_bitrev(struct snd_usb_substream *subs,
+ struct urb *urb, unsigned int bytes)
+{
+ struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
+ const u8 *src = runtime->dma_area;
+ u8 *buf = urb->transfer_buffer;
+ int i, ofs = subs->hwptr_done;
+
+ for (i = 0; i < bytes; i++) {
+ *buf++ = bitrev8(src[ofs]);
+ if (++ofs >= subs->buffer_bytes)
+ ofs = 0;
+ }
+
+ urb_ctx_queue_advance(subs, urb, bytes);
+}
+
+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 > subs->buffer_bytes) {
+ /* err, the transferred area goes over buffer boundary. */
+ unsigned int bytes1 = subs->buffer_bytes - 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);
+ }
+
+ urb_ctx_queue_advance(subs, urb, bytes);
+}
+
+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 int prepare_playback_urb(struct snd_usb_substream *subs,
+ struct urb *urb,
+ bool in_stream_lock)
+{
+ 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 frames, bytes;
+ int counts;
+ unsigned int transfer_done, frame_limit, avail = 0;
+ int i, stride, period_elapsed = 0;
+ unsigned long flags;
+ int err = 0;
+
+ stride = ep->stride;
+
+ frames = 0;
+ ctx->queued = 0;
+ urb->number_of_packets = 0;
+
+ spin_lock_irqsave(&subs->lock, flags);
+ frame_limit = subs->frame_limit + ep->max_urb_frames;
+ transfer_done = subs->transfer_done;
+
+ if (subs->lowlatency_playback &&
+ runtime->state != SNDRV_PCM_STATE_DRAINING) {
+ unsigned int hwptr = subs->hwptr_done / stride;
+
+ /* calculate the byte offset-in-buffer of the appl_ptr */
+ avail = (runtime->control->appl_ptr - runtime->hw_ptr_base)
+ % runtime->buffer_size;
+ if (avail <= hwptr)
+ avail += runtime->buffer_size;
+ avail -= hwptr;
+ }
+
+ for (i = 0; i < ctx->packets; i++) {
+ counts = snd_usb_endpoint_next_packet_size(ep, ctx, i, avail);
+ if (counts < 0)
+ break;
+ /* set up descriptor */
+ urb->iso_frame_desc[i].offset = frames * stride;
+ urb->iso_frame_desc[i].length = counts * stride;
+ frames += counts;
+ avail -= counts;
+ urb->number_of_packets++;
+ transfer_done += counts;
+ if (transfer_done >= runtime->period_size) {
+ transfer_done -= runtime->period_size;
+ frame_limit = 0;
+ period_elapsed = 1;
+ if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
+ if (transfer_done > 0) {
+ /* FIXME: fill-max mode is not
+ * supported yet */
+ frames -= transfer_done;
+ counts -= transfer_done;
+ urb->iso_frame_desc[i].length =
+ counts * stride;
+ transfer_done = 0;
+ }
+ i++;
+ if (i < ctx->packets) {
+ /* add a transfer delimiter */
+ urb->iso_frame_desc[i].offset =
+ frames * 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 || transfer_done >= frame_limit) &&
+ !snd_usb_endpoint_implicit_feedback_sink(ep))
+ break;
+ }
+
+ if (!frames) {
+ err = -EAGAIN;
+ goto unlock;
+ }
+
+ bytes = frames * stride;
+ subs->transfer_done = transfer_done;
+ subs->frame_limit = frame_limit;
+ if (unlikely(ep->cur_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
+ subs->cur_audiofmt->dsd_dop)) {
+ fill_playback_urb_dsd_dop(subs, urb, bytes);
+ } else if (unlikely(ep->cur_format == SNDRV_PCM_FORMAT_DSD_U8 &&
+ subs->cur_audiofmt->dsd_bitrev)) {
+ fill_playback_urb_dsd_bitrev(subs, urb, bytes);
+ } 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 */
+ }
+
+ subs->last_frame_number = usb_get_current_frame_number(subs->dev);
+
+ 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;
+ }
+
+ if (period_elapsed && !subs->running && subs->lowlatency_playback) {
+ subs->period_elapsed_pending = 1;
+ period_elapsed = 0;
+ }
+
+ unlock:
+ spin_unlock_irqrestore(&subs->lock, flags);
+ if (err < 0)
+ return err;
+ urb->transfer_buffer_length = bytes;
+ if (period_elapsed) {
+ if (in_stream_lock)
+ snd_pcm_period_elapsed_under_stream_lock(subs->pcm_substream);
+ else
+ snd_pcm_period_elapsed(subs->pcm_substream);
+ }
+ return 0;
+}
+
+/*
+ * 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_urb_ctx *ctx = urb->context;
+ bool period_elapsed = false;
+
+ spin_lock_irqsave(&subs->lock, flags);
+ if (ctx->queued) {
+ if (subs->inflight_bytes >= ctx->queued)
+ subs->inflight_bytes -= ctx->queued;
+ else
+ subs->inflight_bytes = 0;
+ }
+
+ subs->last_frame_number = usb_get_current_frame_number(subs->dev);
+ if (subs->running) {
+ period_elapsed = subs->period_elapsed_pending;
+ subs->period_elapsed_pending = 0;
+ }
+ spin_unlock_irqrestore(&subs->lock, flags);
+ if (period_elapsed)
+ snd_pcm_period_elapsed(subs->pcm_substream);
+}
+
+/* PCM ack callback for the playback stream;
+ * this plays a role only when the stream is running in low-latency mode.
+ */
+static int snd_usb_pcm_playback_ack(struct snd_pcm_substream *substream)
+{
+ struct snd_usb_substream *subs = substream->runtime->private_data;
+ struct snd_usb_endpoint *ep;
+
+ if (!subs->lowlatency_playback || !subs->running)
+ return 0;
+ ep = subs->data_endpoint;
+ if (!ep)
+ return 0;
+ /* When no more in-flight URBs available, try to process the pending
+ * outputs here
+ */
+ if (!ep->active_mask)
+ return snd_usb_queue_pending_output_urbs(ep, true);
+ return 0;
+}
+
+static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
+ int cmd)
+{
+ struct snd_usb_substream *subs = substream->runtime->private_data;
+ int err;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ subs->trigger_tstamp_pending_update = true;
+ fallthrough;
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ snd_usb_endpoint_set_callback(subs->data_endpoint,
+ prepare_playback_urb,
+ retire_playback_urb,
+ subs);
+ if (subs->lowlatency_playback &&
+ cmd == SNDRV_PCM_TRIGGER_START) {
+ if (in_free_wheeling_mode(substream->runtime))
+ subs->lowlatency_playback = false;
+ err = start_endpoints(subs);
+ if (err < 0) {
+ snd_usb_endpoint_set_callback(subs->data_endpoint,
+ NULL, NULL, NULL);
+ return err;
+ }
+ }
+ subs->running = 1;
+ dev_dbg(&subs->dev->dev, "%d:%d Start Playback PCM\n",
+ subs->cur_audiofmt->iface,
+ subs->cur_audiofmt->altsetting);
+ return 0;
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_STOP:
+ stop_endpoints(subs, substream->runtime->state == SNDRV_PCM_STATE_DRAINING);
+ snd_usb_endpoint_set_callback(subs->data_endpoint,
+ NULL, NULL, NULL);
+ subs->running = 0;
+ dev_dbg(&subs->dev->dev, "%d:%d Stop Playback PCM\n",
+ subs->cur_audiofmt->iface,
+ subs->cur_audiofmt->altsetting);
+ return 0;
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ /* keep retire_data_urb for delay calculation */
+ snd_usb_endpoint_set_callback(subs->data_endpoint,
+ NULL,
+ retire_playback_urb,
+ subs);
+ subs->running = 0;
+ dev_dbg(&subs->dev->dev, "%d:%d Pause Playback PCM\n",
+ subs->cur_audiofmt->iface,
+ subs->cur_audiofmt->altsetting);
+ return 0;
+ }
+
+ 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;
+ fallthrough;
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ snd_usb_endpoint_set_callback(subs->data_endpoint,
+ NULL, retire_capture_urb,
+ subs);
+ subs->last_frame_number = usb_get_current_frame_number(subs->dev);
+ subs->running = 1;
+ dev_dbg(&subs->dev->dev, "%d:%d Start Capture PCM\n",
+ subs->cur_audiofmt->iface,
+ subs->cur_audiofmt->altsetting);
+ return 0;
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_STOP:
+ stop_endpoints(subs, false);
+ fallthrough;
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ snd_usb_endpoint_set_callback(subs->data_endpoint,
+ NULL, NULL, NULL);
+ subs->running = 0;
+ dev_dbg(&subs->dev->dev, "%d:%d Stop Capture PCM\n",
+ subs->cur_audiofmt->iface,
+ subs->cur_audiofmt->altsetting);
+ return 0;
+ }
+
+ 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,
+ .ack = snd_usb_pcm_playback_ack,
+};
+
+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->sysdev;
+
+ 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);
+}