| /* |
| * 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 <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; |
| unsigned int hwptr_done; |
| |
| subs = (struct snd_usb_substream *)substream->runtime->private_data; |
| 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; |
| if ((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))) < 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; |
| if ((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))) < 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, bool can_sleep) |
| { |
| 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, can_sleep); |
| 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, can_sleep); |
| 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; |
| } |
| |
| 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; |
| |
| /* 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; |
| iface = usb_ifnum_to_if(dev, 3); |
| |
| if (!iface || iface->num_altsetting == 0) |
| return -EINVAL; |
| |
| alts = &iface->altsetting[1]; |
| goto add_sync_ep; |
| break; |
| case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */ |
| case USB_ID(0x0763, 0x2081): |
| ep = 0x81; |
| iface = usb_ifnum_to_if(dev, 2); |
| |
| if (!iface || iface->num_altsetting == 0) |
| return -EINVAL; |
| |
| alts = &iface->altsetting[1]; |
| goto add_sync_ep; |
| } |
| 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: |
| 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 0; |
| } |
| |
| 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; |
| |
| err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr); |
| if (err < 0) |
| return err; |
| |
| if (altsd->bNumEndpoints < 2) |
| return 0; |
| |
| if ((is_playback && attr != USB_ENDPOINT_SYNC_ASYNC) || |
| (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE)) |
| return 0; |
| |
| /* 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); |
| return -EINVAL; |
| } |
| ep = get_endpoint(alts, 1)->bEndpointAddress; |
| if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && |
| ((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); |
| 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) |
| 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 = &iface->altsetting[fmt->altset_idx]; |
| altsd = get_iface_desc(alts); |
| if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting)) |
| return -EINVAL; |
| |
| if (fmt == subs->cur_audiofmt) |
| return 0; |
| |
| /* close the old interface */ |
| if (subs->interface >= 0 && subs->interface != fmt->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; |
| } |
| |
| /* set interface */ |
| if (subs->interface != fmt->iface || |
| subs->altset_idx != fmt->altset_idx) { |
| |
| 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); |
| subs->interface = fmt->iface; |
| subs->altset_idx = fmt->altset_idx; |
| |
| snd_usb_set_interface_quirk(dev); |
| } |
| |
| 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; |
| } |
| |
| /* |
| * hw_params callback |
| * |
| * allocate a buffer and set the given audio format. |
| * |
| * so far we use a physically linear buffer although packetize transfer |
| * doesn't need a continuous area. |
| * if sg buffer is supported on the later version of alsa, we'll follow |
| * that. |
| */ |
| static int snd_usb_hw_params(struct snd_pcm_substream *substream, |
| struct snd_pcm_hw_params *hw_params) |
| { |
| struct snd_usb_substream *subs = substream->runtime->private_data; |
| struct audioformat *fmt; |
| int ret; |
| |
| ret = snd_pcm_lib_alloc_vmalloc_buffer(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 = set_format(subs, fmt); |
| snd_usb_unlock_shutdown(subs->stream->chip); |
| if (ret < 0) |
| return ret; |
| |
| subs->interface = fmt->iface; |
| subs->altset_idx = fmt->altset_idx; |
| subs->need_setup_ep = true; |
| |
| return 0; |
| } |
| |
| /* |
| * 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); |
| } |
| return snd_pcm_lib_free_vmalloc_buffer(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 = set_format(subs, subs->cur_audiofmt); |
| if (ret < 0) |
| goto unlock; |
| |
| 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; |
| |
| if (subs->need_setup_ep) { |
| 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, true); |
| |
| unlock: |
| snd_usb_unlock_shutdown(subs->stream->chip); |
| return ret; |
| } |
| |
| static 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(sizeof(int) * count, 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); |
| } |
| err = snd_usb_autoresume(subs->stream->chip); |
| if (err < 0) |
| return err; |
| |
| 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; |
| snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, |
| ptmin, UINT_MAX); |
| |
| if ((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)) < 0) |
| goto rep_err; |
| if ((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)) < 0) |
| goto rep_err; |
| if ((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)) < 0) |
| goto rep_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) |
| goto rep_err; |
| } |
| if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0) |
| goto rep_err; |
| return 0; |
| |
| rep_err: |
| snd_usb_autosuspend(subs->stream->chip); |
| return err; |
| } |
| |
| static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction) |
| { |
| 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; |
| |
| return setup_hw_info(runtime, subs); |
| } |
| |
| static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction) |
| { |
| struct snd_usb_stream *as = snd_pcm_substream_chip(substream); |
| struct snd_usb_substream *subs = &as->substream[direction]; |
| |
| stop_endpoints(subs, true); |
| |
| if (subs->interface >= 0 && |
| !snd_usb_lock_shutdown(subs->stream->chip)) { |
| usb_set_interface(subs->dev, subs->interface, 0); |
| subs->interface = -1; |
| snd_usb_unlock_shutdown(subs->stream->chip); |
| } |
| |
| subs->pcm_substream = NULL; |
| snd_usb_autosuspend(subs->stream->chip); |
| |
| return 0; |
| } |
| |
| /* Since a URB can handle only a single linear buffer, we must use double |
| * buffering when the data to be transferred overflows the buffer boundary. |
| * To avoid inconsistencies when updating hwptr_done, we use double buffering |
| * for all URBs. |
| */ |
| static void retire_capture_urb(struct snd_usb_substream *subs, |
| struct urb *urb) |
| { |
| struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; |
| unsigned int stride, frames, bytes, oldptr; |
| int i, period_elapsed = 0; |
| unsigned long flags; |
| unsigned char *cp; |
| int current_frame_number; |
| |
| /* read frame number here, update pointer in critical section */ |
| current_frame_number = usb_get_current_frame_number(subs->dev); |
| |
| stride = runtime->frame_bits >> 3; |
| |
| for (i = 0; i < urb->number_of_packets; i++) { |
| cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj; |
| if (urb->iso_frame_desc[i].status && printk_ratelimit()) { |
| dev_dbg(&subs->dev->dev, "frame %d active: %d\n", |
| i, urb->iso_frame_desc[i].status); |
| // continue; |
| } |
| bytes = urb->iso_frame_desc[i].actual_length; |
| frames = bytes / stride; |
| if (!subs->txfr_quirk) |
| bytes = frames * stride; |
| if (bytes % (runtime->sample_bits >> 3) != 0) { |
| int oldbytes = bytes; |
| bytes = frames * stride; |
| dev_warn(&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++; |
| } |
| } |
| } |
| |
| 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; |
| } else { |
| /* usual PCM */ |
| 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, |
| runtime->dma_area + subs->hwptr_done, bytes1); |
| memcpy(urb->transfer_buffer + bytes1, |
| runtime->dma_area, bytes - bytes1); |
| } else { |
| memcpy(urb->transfer_buffer, |
| 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; |
| |
| /* 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_playback_open(struct snd_pcm_substream *substream) |
| { |
| return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK); |
| } |
| |
| static int snd_usb_playback_close(struct snd_pcm_substream *substream) |
| { |
| return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK); |
| } |
| |
| static int snd_usb_capture_open(struct snd_pcm_substream *substream) |
| { |
| return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE); |
| } |
| |
| static int snd_usb_capture_close(struct snd_pcm_substream *substream) |
| { |
| return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE); |
| } |
| |
| 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; |
| 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; |
| } |
| |
| 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, false); |
| 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; |
| } |
| |
| return -EINVAL; |
| } |
| |
| static struct snd_pcm_ops snd_usb_playback_ops = { |
| .open = snd_usb_playback_open, |
| .close = snd_usb_playback_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, |
| .mmap = snd_pcm_lib_mmap_vmalloc, |
| }; |
| |
| static struct snd_pcm_ops snd_usb_capture_ops = { |
| .open = snd_usb_capture_open, |
| .close = snd_usb_capture_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, |
| .mmap = snd_pcm_lib_mmap_vmalloc, |
| }; |
| |
| void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream) |
| { |
| snd_pcm_set_ops(pcm, stream, |
| stream == SNDRV_PCM_STREAM_PLAYBACK ? |
| &snd_usb_playback_ops : &snd_usb_capture_ops); |
| } |