[Feature] add GA346 baseline version
Change-Id: Ic62933698569507dcf98240cdf5d9931ae34348f
diff --git a/src/kernel/linux/v4.19/sound/usb/pcm.c b/src/kernel/linux/v4.19/sound/usb/pcm.c
new file mode 100644
index 0000000..97b1bd7
--- /dev/null
+++ b/src/kernel/linux/v4.19/sound/usb/pcm.c
@@ -0,0 +1,1857 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#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 <linux/pm_qos.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+
+#include "usbaudio.h"
+#include "card.h"
+#include "quirks.h"
+#include "debug.h"
+#include "endpoint.h"
+#include "helper.h"
+#include "pcm.h"
+#include "clock.h"
+#include "power.h"
+
+#define SUBSTREAM_FLAG_DATA_EP_STARTED 0
+#define SUBSTREAM_FLAG_SYNC_EP_STARTED 1
+
+/* return the estimated delay based on USB frame counters */
+snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
+ unsigned int rate)
+{
+ int current_frame_number;
+ int frame_diff;
+ int est_delay;
+
+ if (!subs->last_delay)
+ return 0; /* short path */
+
+ 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 * rate / 1000;
+ if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
+ est_delay = subs->last_delay - est_delay;
+ else
+ est_delay = subs->last_delay + 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_usb_substream *subs = substream->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;
+ substream->runtime->delay = snd_usb_pcm_delay(subs,
+ substream->runtime->rate);
+ spin_unlock(&subs->lock);
+ return hwptr_done / (substream->runtime->frame_bits >> 3);
+}
+
+/*
+ * find a matching audio format
+ */
+static struct audioformat *find_format(struct snd_usb_substream *subs)
+{
+ struct audioformat *fp;
+ struct audioformat *found = NULL;
+ int cur_attr = 0, attr;
+
+ list_for_each_entry(fp, &subs->fmt_list, list) {
+ if (!(fp->formats & pcm_format_to_bits(subs->pcm_format)))
+ continue;
+ if (fp->channels != subs->channels)
+ continue;
+ if (subs->cur_rate < fp->rate_min ||
+ subs->cur_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] == subs->cur_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 (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 int init_pitch_v1(struct snd_usb_audio *chip, int iface,
+ struct usb_host_interface *alts,
+ struct audioformat *fmt)
+{
+ struct usb_device *dev = chip->dev;
+ unsigned int ep;
+ unsigned char data[1];
+ int err;
+
+ if (get_iface_desc(alts)->bNumEndpoints < 1)
+ return -EINVAL;
+ ep = get_endpoint(alts, 0)->bEndpointAddress;
+
+ 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));
+ if (err < 0) {
+ usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n",
+ iface, ep);
+ return err;
+ }
+
+ return 0;
+}
+
+static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
+ struct usb_host_interface *alts,
+ struct audioformat *fmt)
+{
+ 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));
+ if (err < 0) {
+ usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n",
+ iface, fmt->altsetting);
+ return err;
+ }
+
+ return 0;
+}
+
+/*
+ * initialize the pitch control and sample rate
+ */
+int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
+ struct usb_host_interface *alts,
+ struct audioformat *fmt)
+{
+ /* if endpoint doesn't have pitch control, bail out */
+ if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
+ return 0;
+
+ switch (fmt->protocol) {
+ case UAC_VERSION_1:
+ default:
+ return init_pitch_v1(chip, iface, alts, fmt);
+
+ case UAC_VERSION_2:
+ return init_pitch_v2(chip, iface, alts, fmt);
+ }
+}
+
+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)) {
+ struct snd_usb_endpoint *ep = subs->data_endpoint;
+
+ dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep);
+
+ ep->data_subs = subs;
+ err = snd_usb_endpoint_start(ep);
+ if (err < 0) {
+ clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
+ return err;
+ }
+ }
+
+ if (subs->sync_endpoint &&
+ !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
+ struct snd_usb_endpoint *ep = subs->sync_endpoint;
+
+ if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
+ subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) {
+ err = usb_set_interface(subs->dev,
+ subs->sync_endpoint->iface,
+ subs->sync_endpoint->altsetting);
+ if (err < 0) {
+ clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
+ dev_err(&subs->dev->dev,
+ "%d:%d: cannot set interface (%d)\n",
+ subs->sync_endpoint->iface,
+ subs->sync_endpoint->altsetting, err);
+ return -EIO;
+ }
+ }
+
+ dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep);
+
+ ep->sync_slave = subs->data_endpoint;
+ err = snd_usb_endpoint_start(ep);
+ if (err < 0) {
+ clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static void stop_endpoints(struct snd_usb_substream *subs, bool wait)
+{
+ if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
+ snd_usb_endpoint_stop(subs->sync_endpoint);
+
+ if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
+ snd_usb_endpoint_stop(subs->data_endpoint);
+
+ if (wait) {
+ snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
+ snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
+ }
+}
+
+static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
+ unsigned int altsetting,
+ struct usb_host_interface **alts,
+ unsigned int *ep)
+{
+ struct usb_interface *iface;
+ struct usb_interface_descriptor *altsd;
+ struct usb_endpoint_descriptor *epd;
+
+ iface = usb_ifnum_to_if(dev, ifnum);
+ if (!iface || iface->num_altsetting < altsetting + 1)
+ return -ENOENT;
+ *alts = &iface->altsetting[altsetting];
+ altsd = get_iface_desc(*alts);
+ if (altsd->bAlternateSetting != altsetting ||
+ altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
+ (altsd->bInterfaceSubClass != 2 &&
+ altsd->bInterfaceProtocol != 2 ) ||
+ altsd->bNumEndpoints < 1)
+ return -ENOENT;
+ epd = get_endpoint(*alts, 0);
+ if (!usb_endpoint_is_isoc_in(epd) ||
+ (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
+ USB_ENDPOINT_USAGE_IMPLICIT_FB)
+ return -ENOENT;
+ *ep = epd->bEndpointAddress;
+ return 0;
+}
+
+/* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
+ * applies. Returns 1 if a quirk was found.
+ */
+static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
+ struct usb_device *dev,
+ struct usb_interface_descriptor *altsd,
+ unsigned int attr)
+{
+ struct usb_host_interface *alts;
+ struct usb_interface *iface;
+ unsigned int ep;
+ unsigned int ifnum;
+
+ /* Implicit feedback sync EPs consumers are always playback EPs */
+ if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
+ return 0;
+
+ switch (subs->stream->chip->usb_id) {
+ case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
+ case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
+ ep = 0x81;
+ ifnum = 3;
+ goto add_sync_ep_from_ifnum;
+ case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
+ case USB_ID(0x0763, 0x2081):
+ ep = 0x81;
+ ifnum = 2;
+ goto add_sync_ep_from_ifnum;
+ case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
+ ep = 0x86;
+ ifnum = 2;
+ goto add_sync_ep_from_ifnum;
+ case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
+ ep = 0x81;
+ ifnum = 2;
+ goto add_sync_ep_from_ifnum;
+ case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
+ case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
+ ep = 0x81;
+ ifnum = 1;
+ goto add_sync_ep_from_ifnum;
+ case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
+ /* BOSS Katana amplifiers do not need quirks */
+ return 0;
+ }
+
+ if (attr == USB_ENDPOINT_SYNC_ASYNC &&
+ altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
+ altsd->bInterfaceProtocol == 2 &&
+ altsd->bNumEndpoints == 1 &&
+ USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
+ search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
+ altsd->bAlternateSetting,
+ &alts, &ep) >= 0) {
+ goto add_sync_ep;
+ }
+
+ /* No quirk */
+ return 0;
+
+add_sync_ep_from_ifnum:
+ iface = usb_ifnum_to_if(dev, ifnum);
+
+ if (!iface || iface->num_altsetting < 2)
+ return -EINVAL;
+
+ alts = &iface->altsetting[1];
+
+add_sync_ep:
+ subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
+ alts, ep, !subs->direction,
+ SND_USB_ENDPOINT_TYPE_DATA);
+ if (!subs->sync_endpoint)
+ return -EINVAL;
+
+ subs->data_endpoint->sync_master = subs->sync_endpoint;
+
+ return 1;
+}
+
+static int set_sync_endpoint(struct snd_usb_substream *subs,
+ struct audioformat *fmt,
+ struct usb_device *dev,
+ struct usb_host_interface *alts,
+ struct usb_interface_descriptor *altsd)
+{
+ int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
+ unsigned int ep, attr;
+ bool implicit_fb;
+ int err;
+
+ /* we need a sync pipe in async OUT or adaptive IN mode */
+ /* check the number of EP, since some devices have broken
+ * descriptors which fool us. if it has only one EP,
+ * assume it as adaptive-out or sync-in.
+ */
+ attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
+
+ if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
+ (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
+
+ /*
+ * In these modes the notion of sync_endpoint is irrelevant.
+ * Reset pointers to avoid using stale data from previously
+ * used settings, e.g. when configuration and endpoints were
+ * changed
+ */
+
+ subs->sync_endpoint = NULL;
+ subs->data_endpoint->sync_master = NULL;
+ }
+
+ err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
+ if (err < 0)
+ return err;
+
+ /* endpoint set by quirk */
+ if (err > 0)
+ return 0;
+
+ if (altsd->bNumEndpoints < 2)
+ return 0;
+
+ if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
+ attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
+ (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
+ return 0;
+
+ /*
+ * 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 ((get_endpoint(alts, 1)->bmAttributes & 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;
+ }
+
+ 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, true);
+ 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;
+
+ if (snd_usb_use_vmalloc)
+ ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
+ params_buffer_bytes(hw_params));
+ else
+ ret = snd_pcm_lib_malloc_pages(substream,
+ params_buffer_bytes(hw_params));
+ if (ret < 0)
+ 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);
+ return -EINVAL;
+ }
+
+ ret = snd_usb_lock_shutdown(subs->stream->chip);
+ if (ret < 0)
+ return ret;
+
+ 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);
+ 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;
+
+ subs->cur_audiofmt = NULL;
+ subs->cur_rate = 0;
+ subs->period_bytes = 0;
+ if (!snd_usb_lock_shutdown(subs->stream->chip)) {
+ stop_endpoints(subs, true);
+ snd_usb_endpoint_deactivate(subs->sync_endpoint);
+ snd_usb_endpoint_deactivate(subs->data_endpoint);
+ snd_usb_unlock_shutdown(subs->stream->chip);
+ }
+
+ if (snd_usb_use_vmalloc)
+ return snd_pcm_lib_free_vmalloc_buffer(substream);
+ else
+ return snd_pcm_lib_free_pages(substream);
+}
+
+/*
+ * 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;
+ }
+
+ snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
+ snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
+
+ 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];
+
+ 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;
+
+ /* add the qos request and set the latency */
+ pm_qos_add_request(&subs->pm_qos,
+ PM_QOS_CPU_DMA_LATENCY, US_PER_FRAME);
+
+ return setup_hw_info(runtime, subs);
+}
+
+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;
+
+ stop_endpoints(subs, true);
+
+ 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);
+
+ /* remove the qos request */
+ pm_qos_remove_request(&subs->pm_qos);
+
+ 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, false);
+ 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, true);
+ 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, false);
+ 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, true);
+ 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,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = snd_usb_hw_params,
+ .hw_free = snd_usb_hw_free,
+ .prepare = snd_usb_pcm_prepare,
+ .trigger = snd_usb_substream_playback_trigger,
+ .pointer = snd_usb_pcm_pointer,
+ .page = snd_pcm_lib_get_vmalloc_page,
+};
+
+static const struct snd_pcm_ops snd_usb_capture_ops = {
+ .open = snd_usb_pcm_open,
+ .close = snd_usb_pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = snd_usb_hw_params,
+ .hw_free = snd_usb_hw_free,
+ .prepare = snd_usb_pcm_prepare,
+ .trigger = snd_usb_substream_capture_trigger,
+ .pointer = snd_usb_pcm_pointer,
+ .page = snd_pcm_lib_get_vmalloc_page,
+};
+
+static const struct snd_pcm_ops snd_usb_playback_dev_ops = {
+ .open = snd_usb_pcm_open,
+ .close = snd_usb_pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = snd_usb_hw_params,
+ .hw_free = snd_usb_hw_free,
+ .prepare = snd_usb_pcm_prepare,
+ .trigger = snd_usb_substream_playback_trigger,
+ .pointer = snd_usb_pcm_pointer,
+ .page = snd_pcm_sgbuf_ops_page,
+};
+
+static const struct snd_pcm_ops snd_usb_capture_dev_ops = {
+ .open = snd_usb_pcm_open,
+ .close = snd_usb_pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = snd_usb_hw_params,
+ .hw_free = snd_usb_hw_free,
+ .prepare = snd_usb_pcm_prepare,
+ .trigger = snd_usb_substream_capture_trigger,
+ .pointer = snd_usb_pcm_pointer,
+ .page = snd_pcm_sgbuf_ops_page,
+};
+
+void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
+{
+ const struct snd_pcm_ops *ops;
+
+ if (snd_usb_use_vmalloc)
+ ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
+ &snd_usb_playback_ops : &snd_usb_capture_ops;
+ else
+ ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
+ &snd_usb_playback_dev_ops : &snd_usb_capture_dev_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_lib_preallocate_pages(s, SNDRV_DMA_TYPE_DEV_SG,
+ dev, 64*1024, 512*1024);
+}