pcm.rar_return

/* * 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 (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; 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,