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sound/usb/endpoint.c
31 KB
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/* * 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 * */ |
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#include <linux/gfp.h> #include <linux/init.h> |
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#include <linux/ratelimit.h> |
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#include <linux/usb.h> #include <linux/usb/audio.h> |
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#include <linux/slab.h> |
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#include <sound/core.h> #include <sound/pcm.h> |
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#include <sound/pcm_params.h> |
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#include "usbaudio.h" #include "helper.h" #include "card.h" #include "endpoint.h" #include "pcm.h" |
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#include "quirks.h" |
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|
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#define EP_FLAG_RUNNING 1 |
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#define EP_FLAG_STOPPING 2 |
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|
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/* |
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* snd_usb_endpoint is a model that abstracts everything related to an * USB endpoint and its streaming. * * There are functions to activate and deactivate the streaming URBs and |
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* optional callbacks to let the pcm logic handle the actual content of the |
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* packets for playback and record. Thus, the bus streaming and the audio * handlers are fully decoupled. * |
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* There are two different types of endpoints in audio applications. |
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* * SND_USB_ENDPOINT_TYPE_DATA handles full audio data payload for both * inbound and outbound traffic. * |
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* SND_USB_ENDPOINT_TYPE_SYNC endpoints are for inbound traffic only and * expect the payload to carry Q10.14 / Q16.16 formatted sync information * (3 or 4 bytes). |
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* |
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* Each endpoint has to be configured prior to being used by calling * snd_usb_endpoint_set_params(). |
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* * The model incorporates a reference counting, so that multiple users * can call snd_usb_endpoint_start() and snd_usb_endpoint_stop(), and * only the first user will effectively start the URBs, and only the last |
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* one to stop it will tear the URBs down again. |
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*/ /* |
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* convert a sampling rate into our full speed format (fs/1000 in Q16.16) * this will overflow at approx 524 kHz */ static inline unsigned get_usb_full_speed_rate(unsigned int rate) { return ((rate << 13) + 62) / 125; } /* * convert a sampling rate into USB high speed format (fs/8000 in Q16.16) * this will overflow at approx 4 MHz */ static inline unsigned get_usb_high_speed_rate(unsigned int rate) { return ((rate << 10) + 62) / 125; } /* |
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* release a urb data */ static void release_urb_ctx(struct snd_urb_ctx *u) { |
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if (u->buffer_size) usb_free_coherent(u->ep->chip->dev, u->buffer_size, u->urb->transfer_buffer, u->urb->transfer_dma); usb_free_urb(u->urb); u->urb = NULL; |
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} static const char *usb_error_string(int err) { switch (err) { case -ENODEV: return "no device"; case -ENOENT: return "endpoint not enabled"; case -EPIPE: return "endpoint stalled"; case -ENOSPC: return "not enough bandwidth"; case -ESHUTDOWN: return "device disabled"; case -EHOSTUNREACH: return "device suspended"; case -EINVAL: case -EAGAIN: case -EFBIG: case -EMSGSIZE: return "internal error"; default: return "unknown error"; } } |
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/** * snd_usb_endpoint_implicit_feedback_sink: Report endpoint usage type * |
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* @ep: The snd_usb_endpoint |
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* * Determine whether an endpoint is driven by an implicit feedback * data endpoint source. */ |
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int snd_usb_endpoint_implicit_feedback_sink(struct snd_usb_endpoint *ep) |
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{ return ep->sync_master && ep->sync_master->type == SND_USB_ENDPOINT_TYPE_DATA && ep->type == SND_USB_ENDPOINT_TYPE_DATA && usb_pipeout(ep->pipe); } |
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/* * For streaming based on information derived from sync endpoints, * prepare_outbound_urb_sizes() will call next_packet_size() to * determine the number of samples to be sent in the next packet. * * For implicit feedback, next_packet_size() is unused. */ |
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int snd_usb_endpoint_next_packet_size(struct snd_usb_endpoint *ep) |
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{ unsigned long flags; int ret; if (ep->fill_max) return ep->maxframesize; spin_lock_irqsave(&ep->lock, flags); ep->phase = (ep->phase & 0xffff) + (ep->freqm << ep->datainterval); ret = min(ep->phase >> 16, ep->maxframesize); spin_unlock_irqrestore(&ep->lock, flags); return ret; } static void retire_outbound_urb(struct snd_usb_endpoint *ep, struct snd_urb_ctx *urb_ctx) { if (ep->retire_data_urb) ep->retire_data_urb(ep->data_subs, urb_ctx->urb); } static void retire_inbound_urb(struct snd_usb_endpoint *ep, struct snd_urb_ctx *urb_ctx) { struct urb *urb = urb_ctx->urb; |
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if (unlikely(ep->skip_packets > 0)) { ep->skip_packets--; return; } |
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if (ep->sync_slave) snd_usb_handle_sync_urb(ep->sync_slave, ep, urb); if (ep->retire_data_urb) ep->retire_data_urb(ep->data_subs, urb); } |
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/* * Prepare a PLAYBACK urb for submission to the bus. */ static void prepare_outbound_urb(struct snd_usb_endpoint *ep, struct snd_urb_ctx *ctx) { int i; struct urb *urb = ctx->urb; unsigned char *cp = urb->transfer_buffer; urb->dev = ep->chip->dev; /* we need to set this at each time */ switch (ep->type) { case SND_USB_ENDPOINT_TYPE_DATA: if (ep->prepare_data_urb) { ep->prepare_data_urb(ep->data_subs, urb); } else { /* no data provider, so send silence */ unsigned int offs = 0; for (i = 0; i < ctx->packets; ++i) { |
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int counts; if (ctx->packet_size[i]) counts = ctx->packet_size[i]; else counts = snd_usb_endpoint_next_packet_size(ep); |
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urb->iso_frame_desc[i].offset = offs * ep->stride; urb->iso_frame_desc[i].length = counts * ep->stride; offs += counts; } urb->number_of_packets = ctx->packets; urb->transfer_buffer_length = offs * ep->stride; memset(urb->transfer_buffer, ep->silence_value, offs * ep->stride); } break; case SND_USB_ENDPOINT_TYPE_SYNC: if (snd_usb_get_speed(ep->chip->dev) >= USB_SPEED_HIGH) { /* * fill the length and offset of each urb descriptor. * the fixed 12.13 frequency is passed as 16.16 through the pipe. */ urb->iso_frame_desc[0].length = 4; urb->iso_frame_desc[0].offset = 0; cp[0] = ep->freqn; cp[1] = ep->freqn >> 8; cp[2] = ep->freqn >> 16; cp[3] = ep->freqn >> 24; } else { /* * fill the length and offset of each urb descriptor. * the fixed 10.14 frequency is passed through the pipe. */ urb->iso_frame_desc[0].length = 3; urb->iso_frame_desc[0].offset = 0; cp[0] = ep->freqn >> 2; cp[1] = ep->freqn >> 10; cp[2] = ep->freqn >> 18; } break; } } /* * Prepare a CAPTURE or SYNC urb for submission to the bus. */ static inline void prepare_inbound_urb(struct snd_usb_endpoint *ep, struct snd_urb_ctx *urb_ctx) { int i, offs; struct urb *urb = urb_ctx->urb; urb->dev = ep->chip->dev; /* we need to set this at each time */ switch (ep->type) { case SND_USB_ENDPOINT_TYPE_DATA: offs = 0; for (i = 0; i < urb_ctx->packets; i++) { urb->iso_frame_desc[i].offset = offs; urb->iso_frame_desc[i].length = ep->curpacksize; offs += ep->curpacksize; } urb->transfer_buffer_length = offs; urb->number_of_packets = urb_ctx->packets; break; case SND_USB_ENDPOINT_TYPE_SYNC: urb->iso_frame_desc[0].length = min(4u, ep->syncmaxsize); urb->iso_frame_desc[0].offset = 0; break; } } |
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/* |
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* Send output urbs that have been prepared previously. URBs are dequeued |
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* from ep->ready_playback_urbs and in case there there aren't any available * or there are no packets that have been prepared, this function does * nothing. * |
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* The reason why the functionality of sending and preparing URBs is separated * is that host controllers don't guarantee the order in which they return * inbound and outbound packets to their submitters. |
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* * This function is only used for implicit feedback endpoints. For endpoints |
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* driven by dedicated sync endpoints, URBs are immediately re-submitted * from their completion handler. |
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*/ |
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static void queue_pending_output_urbs(struct snd_usb_endpoint *ep) { while (test_bit(EP_FLAG_RUNNING, &ep->flags)) { unsigned long flags; |
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struct snd_usb_packet_info *uninitialized_var(packet); |
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struct snd_urb_ctx *ctx = NULL; struct urb *urb; int err, i; spin_lock_irqsave(&ep->lock, flags); if (ep->next_packet_read_pos != ep->next_packet_write_pos) { packet = ep->next_packet + ep->next_packet_read_pos; ep->next_packet_read_pos++; ep->next_packet_read_pos %= MAX_URBS; /* take URB out of FIFO */ if (!list_empty(&ep->ready_playback_urbs)) ctx = list_first_entry(&ep->ready_playback_urbs, struct snd_urb_ctx, ready_list); } spin_unlock_irqrestore(&ep->lock, flags); if (ctx == NULL) return; list_del_init(&ctx->ready_list); urb = ctx->urb; /* copy over the length information */ for (i = 0; i < packet->packets; i++) ctx->packet_size[i] = packet->packet_size[i]; |
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/* call the data handler to fill in playback data */ |
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prepare_outbound_urb(ep, ctx); err = usb_submit_urb(ctx->urb, GFP_ATOMIC); if (err < 0) |
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usb_audio_err(ep->chip, "Unable to submit urb #%d: %d (urb %p) ", ctx->index, err, ctx->urb); |
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else set_bit(ctx->index, &ep->active_mask); } } /* * complete callback for urbs */ static void snd_complete_urb(struct urb *urb) { struct snd_urb_ctx *ctx = urb->context; struct snd_usb_endpoint *ep = ctx->ep; |
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struct snd_pcm_substream *substream; unsigned long flags; |
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int err; if (unlikely(urb->status == -ENOENT || /* unlinked */ urb->status == -ENODEV || /* device removed */ urb->status == -ECONNRESET || /* unlinked */ urb->status == -ESHUTDOWN || /* device disabled */ ep->chip->shutdown)) /* device disconnected */ goto exit_clear; if (usb_pipeout(ep->pipe)) { retire_outbound_urb(ep, ctx); /* can be stopped during retire callback */ if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags))) goto exit_clear; |
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if (snd_usb_endpoint_implicit_feedback_sink(ep)) { |
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spin_lock_irqsave(&ep->lock, flags); list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs); spin_unlock_irqrestore(&ep->lock, flags); queue_pending_output_urbs(ep); goto exit_clear; } |
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prepare_outbound_urb(ep, ctx); } else { retire_inbound_urb(ep, ctx); /* can be stopped during retire callback */ if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags))) goto exit_clear; prepare_inbound_urb(ep, ctx); } err = usb_submit_urb(urb, GFP_ATOMIC); if (err == 0) return; |
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usb_audio_err(ep->chip, "cannot submit urb (err = %d) ", err); |
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if (ep->data_subs && ep->data_subs->pcm_substream) { substream = ep->data_subs->pcm_substream; |
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snd_pcm_stop_xrun(substream); |
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} |
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exit_clear: clear_bit(ctx->index, &ep->active_mask); } |
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/** |
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* snd_usb_add_endpoint: Add an endpoint to an USB audio chip |
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* * @chip: The chip * @alts: The USB host interface * @ep_num: The number of the endpoint to use * @direction: SNDRV_PCM_STREAM_PLAYBACK or SNDRV_PCM_STREAM_CAPTURE * @type: SND_USB_ENDPOINT_TYPE_DATA or SND_USB_ENDPOINT_TYPE_SYNC * * If the requested endpoint has not been added to the given chip before, * a new instance is created. Otherwise, a pointer to the previoulsy * created instance is returned. In case of any error, NULL is returned. * * New endpoints will be added to chip->ep_list and must be freed by * calling snd_usb_endpoint_free(). */ |
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struct snd_usb_endpoint *snd_usb_add_endpoint(struct snd_usb_audio *chip, struct usb_host_interface *alts, int ep_num, int direction, int type) { |
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struct snd_usb_endpoint *ep; |
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int is_playback = direction == SNDRV_PCM_STREAM_PLAYBACK; |
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|
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if (WARN_ON(!alts)) return NULL; |
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mutex_lock(&chip->mutex); |
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list_for_each_entry(ep, &chip->ep_list, list) { |
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if (ep->ep_num == ep_num && ep->iface == alts->desc.bInterfaceNumber && |
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ep->altsetting == alts->desc.bAlternateSetting) { |
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usb_audio_dbg(ep->chip, "Re-using EP %x in iface %d,%d @%p ", |
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ep_num, ep->iface, ep->altsetting, ep); |
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goto __exit_unlock; } } |
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usb_audio_dbg(chip, "Creating new %s %s endpoint #%x ", |
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is_playback ? "playback" : "capture", type == SND_USB_ENDPOINT_TYPE_DATA ? "data" : "sync", ep_num); |
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ep = kzalloc(sizeof(*ep), GFP_KERNEL); if (!ep) goto __exit_unlock; ep->chip = chip; spin_lock_init(&ep->lock); ep->type = type; ep->ep_num = ep_num; ep->iface = alts->desc.bInterfaceNumber; |
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ep->altsetting = alts->desc.bAlternateSetting; |
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INIT_LIST_HEAD(&ep->ready_playback_urbs); ep_num &= USB_ENDPOINT_NUMBER_MASK; if (is_playback) ep->pipe = usb_sndisocpipe(chip->dev, ep_num); else ep->pipe = usb_rcvisocpipe(chip->dev, ep_num); if (type == SND_USB_ENDPOINT_TYPE_SYNC) { if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && get_endpoint(alts, 1)->bRefresh >= 1 && get_endpoint(alts, 1)->bRefresh <= 9) ep->syncinterval = get_endpoint(alts, 1)->bRefresh; else if (snd_usb_get_speed(chip->dev) == USB_SPEED_FULL) ep->syncinterval = 1; else if (get_endpoint(alts, 1)->bInterval >= 1 && get_endpoint(alts, 1)->bInterval <= 16) ep->syncinterval = get_endpoint(alts, 1)->bInterval - 1; else ep->syncinterval = 3; ep->syncmaxsize = le16_to_cpu(get_endpoint(alts, 1)->wMaxPacketSize); |
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if (chip->usb_id == USB_ID(0x0644, 0x8038) /* TEAC UD-H01 */ && ep->syncmaxsize == 4) ep->udh01_fb_quirk = 1; |
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} list_add_tail(&ep->list, &chip->ep_list); __exit_unlock: mutex_unlock(&chip->mutex); return ep; } /* * wait until all urbs are processed. */ static int wait_clear_urbs(struct snd_usb_endpoint *ep) { unsigned long end_time = jiffies + msecs_to_jiffies(1000); |
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int alive; do { |
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alive = bitmap_weight(&ep->active_mask, ep->nurbs); |
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if (!alive) break; schedule_timeout_uninterruptible(1); } while (time_before(jiffies, end_time)); if (alive) |
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usb_audio_err(ep->chip, "timeout: still %d active urbs on EP #%x ", alive, ep->ep_num); |
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clear_bit(EP_FLAG_STOPPING, &ep->flags); |
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return 0; } |
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/* sync the pending stop operation; * this function itself doesn't trigger the stop operation */ void snd_usb_endpoint_sync_pending_stop(struct snd_usb_endpoint *ep) { if (ep && test_bit(EP_FLAG_STOPPING, &ep->flags)) wait_clear_urbs(ep); } |
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/* * unlink active urbs. */ |
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static int deactivate_urbs(struct snd_usb_endpoint *ep, bool force) |
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{ |
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unsigned int i; |
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if (!force && ep->chip->shutdown) /* to be sure... */ return -EBADFD; |
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clear_bit(EP_FLAG_RUNNING, &ep->flags); INIT_LIST_HEAD(&ep->ready_playback_urbs); ep->next_packet_read_pos = 0; ep->next_packet_write_pos = 0; |
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for (i = 0; i < ep->nurbs; i++) { if (test_bit(i, &ep->active_mask)) { if (!test_and_set_bit(i, &ep->unlink_mask)) { struct urb *u = ep->urb[i].urb; |
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usb_unlink_urb(u); |
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} } } return 0; } /* * release an endpoint's urbs */ static void release_urbs(struct snd_usb_endpoint *ep, int force) { int i; /* route incoming urbs to nirvana */ ep->retire_data_urb = NULL; ep->prepare_data_urb = NULL; /* stop urbs */ |
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deactivate_urbs(ep, force); |
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wait_clear_urbs(ep); for (i = 0; i < ep->nurbs; i++) release_urb_ctx(&ep->urb[i]); if (ep->syncbuf) usb_free_coherent(ep->chip->dev, SYNC_URBS * 4, ep->syncbuf, ep->sync_dma); ep->syncbuf = NULL; ep->nurbs = 0; } |
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/* * configure a data endpoint */ |
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static int data_ep_set_params(struct snd_usb_endpoint *ep, |
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snd_pcm_format_t pcm_format, unsigned int channels, unsigned int period_bytes, |
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unsigned int frames_per_period, unsigned int periods_per_buffer, |
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struct audioformat *fmt, struct snd_usb_endpoint *sync_ep) { |
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unsigned int maxsize, minsize, packs_per_ms, max_packs_per_urb; unsigned int max_packs_per_period, urbs_per_period, urb_packs; unsigned int max_urbs, i; |
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int frame_bits = snd_pcm_format_physical_width(pcm_format) * channels; |
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|
d24f5061e ALSA: snd-usb: ad... |
579 580 581 582 583 584 585 586 |
if (pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE && fmt->dsd_dop) { /* * When operating in DSD DOP mode, the size of a sample frame * in hardware differs from the actual physical format width * because we need to make room for the DOP markers. */ frame_bits += channels << 3; } |
8fdff6a31 ALSA: snd-usb: im... |
587 588 |
ep->datainterval = fmt->datainterval; ep->stride = frame_bits >> 3; |
35ec7aa29 ALSA: usb-audio: ... |
589 |
ep->silence_value = pcm_format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0; |
8fdff6a31 ALSA: snd-usb: im... |
590 |
|
57e6dae10 ALSA: usb-audio: ... |
591 592 593 594 595 596 |
/* assume max. frequency is 25% higher than nominal */ ep->freqmax = ep->freqn + (ep->freqn >> 2); maxsize = ((ep->freqmax + 0xffff) * (frame_bits >> 3)) >> (16 - ep->datainterval); /* but wMaxPacketSize might reduce this */ if (ep->maxpacksize && ep->maxpacksize < maxsize) { |
8fdff6a31 ALSA: snd-usb: im... |
597 598 599 600 |
/* whatever fits into a max. size packet */ maxsize = ep->maxpacksize; ep->freqmax = (maxsize / (frame_bits >> 3)) << (16 - ep->datainterval); |
8fdff6a31 ALSA: snd-usb: im... |
601 602 603 604 605 606 |
} if (ep->fill_max) ep->curpacksize = ep->maxpacksize; else ep->curpacksize = maxsize; |
976b6c064 ALSA: improve buf... |
607 |
if (snd_usb_get_speed(ep->chip->dev) != USB_SPEED_FULL) { |
8fdff6a31 ALSA: snd-usb: im... |
608 |
packs_per_ms = 8 >> ep->datainterval; |
976b6c064 ALSA: improve buf... |
609 |
max_packs_per_urb = MAX_PACKS_HS; |
8fdff6a31 ALSA: snd-usb: im... |
610 |
} else { |
976b6c064 ALSA: improve buf... |
611 612 |
packs_per_ms = 1; max_packs_per_urb = MAX_PACKS; |
8fdff6a31 ALSA: snd-usb: im... |
613 |
} |
98ae472b5 ALSA: usb-audio: ... |
614 |
if (sync_ep && !snd_usb_endpoint_implicit_feedback_sink(ep)) |
976b6c064 ALSA: improve buf... |
615 616 617 618 619 620 621 622 623 624 625 626 627 628 |
max_packs_per_urb = min(max_packs_per_urb, 1U << sync_ep->syncinterval); max_packs_per_urb = max(1u, max_packs_per_urb >> ep->datainterval); /* * Capture endpoints need to use small URBs because there's no way * to tell in advance where the next period will end, and we don't * want the next URB to complete much after the period ends. * * Playback endpoints with implicit sync much use the same parameters * as their corresponding capture endpoint. */ if (usb_pipein(ep->pipe) || snd_usb_endpoint_implicit_feedback_sink(ep)) { |
a93455e1c ALSA: usb: use mu... |
629 630 631 632 633 634 635 636 637 638 639 640 641 642 |
urb_packs = packs_per_ms; /* * Wireless devices can poll at a max rate of once per 4ms. * For dataintervals less than 5, increase the packet count to * allow the host controller to use bursting to fill in the * gaps. */ if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_WIRELESS) { int interval = ep->datainterval; while (interval < 5) { urb_packs <<= 1; ++interval; } } |
976b6c064 ALSA: improve buf... |
643 |
/* make capture URBs <= 1 ms and smaller than a period */ |
a93455e1c ALSA: usb: use mu... |
644 |
urb_packs = min(max_packs_per_urb, urb_packs); |
976b6c064 ALSA: improve buf... |
645 646 647 |
while (urb_packs > 1 && urb_packs * maxsize >= period_bytes) urb_packs >>= 1; ep->nurbs = MAX_URBS; |
8fdff6a31 ALSA: snd-usb: im... |
648 |
|
976b6c064 ALSA: improve buf... |
649 650 651 652 653 654 655 |
/* * Playback endpoints without implicit sync are adjusted so that * a period fits as evenly as possible in the smallest number of * URBs. The total number of URBs is adjusted to the size of the * ALSA buffer, subject to the MAX_URBS and MAX_QUEUE limits. */ } else { |
8fdff6a31 ALSA: snd-usb: im... |
656 |
/* determine how small a packet can be */ |
976b6c064 ALSA: improve buf... |
657 658 |
minsize = (ep->freqn >> (16 - ep->datainterval)) * (frame_bits >> 3); |
8fdff6a31 ALSA: snd-usb: im... |
659 660 661 662 |
/* with sync from device, assume it can be 12% lower */ if (sync_ep) minsize -= minsize >> 3; minsize = max(minsize, 1u); |
8fdff6a31 ALSA: snd-usb: im... |
663 |
|
976b6c064 ALSA: improve buf... |
664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 |
/* how many packets will contain an entire ALSA period? */ max_packs_per_period = DIV_ROUND_UP(period_bytes, minsize); /* how many URBs will contain a period? */ urbs_per_period = DIV_ROUND_UP(max_packs_per_period, max_packs_per_urb); /* how many packets are needed in each URB? */ urb_packs = DIV_ROUND_UP(max_packs_per_period, urbs_per_period); /* limit the number of frames in a single URB */ ep->max_urb_frames = DIV_ROUND_UP(frames_per_period, urbs_per_period); /* try to use enough URBs to contain an entire ALSA buffer */ max_urbs = min((unsigned) MAX_URBS, MAX_QUEUE * packs_per_ms / urb_packs); ep->nurbs = min(max_urbs, urbs_per_period * periods_per_buffer); |
8fdff6a31 ALSA: snd-usb: im... |
681 682 683 684 685 686 687 |
} /* allocate and initialize data urbs */ for (i = 0; i < ep->nurbs; i++) { struct snd_urb_ctx *u = &ep->urb[i]; u->index = i; u->ep = ep; |
976b6c064 ALSA: improve buf... |
688 |
u->packets = urb_packs; |
8fdff6a31 ALSA: snd-usb: im... |
689 690 691 692 693 694 695 696 697 698 699 700 701 702 |
u->buffer_size = maxsize * u->packets; if (fmt->fmt_type == UAC_FORMAT_TYPE_II) u->packets++; /* for transfer delimiter */ u->urb = usb_alloc_urb(u->packets, GFP_KERNEL); if (!u->urb) goto out_of_memory; u->urb->transfer_buffer = usb_alloc_coherent(ep->chip->dev, u->buffer_size, GFP_KERNEL, &u->urb->transfer_dma); if (!u->urb->transfer_buffer) goto out_of_memory; u->urb->pipe = ep->pipe; |
c75c5ab57 ALSA: USB: adjust... |
703 |
u->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; |
8fdff6a31 ALSA: snd-usb: im... |
704 705 706 707 708 709 710 711 712 713 714 715 |
u->urb->interval = 1 << ep->datainterval; u->urb->context = u; u->urb->complete = snd_complete_urb; INIT_LIST_HEAD(&u->ready_list); } return 0; out_of_memory: release_urbs(ep, 0); return -ENOMEM; } |
94c27215b ALSA: snd-usb: ad... |
716 717 718 |
/* * configure a sync endpoint */ |
937210399 ALSA: usb-audio: ... |
719 |
static int sync_ep_set_params(struct snd_usb_endpoint *ep) |
8fdff6a31 ALSA: snd-usb: im... |
720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 |
{ int i; ep->syncbuf = usb_alloc_coherent(ep->chip->dev, SYNC_URBS * 4, GFP_KERNEL, &ep->sync_dma); if (!ep->syncbuf) return -ENOMEM; for (i = 0; i < SYNC_URBS; i++) { struct snd_urb_ctx *u = &ep->urb[i]; u->index = i; u->ep = ep; u->packets = 1; u->urb = usb_alloc_urb(1, GFP_KERNEL); if (!u->urb) goto out_of_memory; u->urb->transfer_buffer = ep->syncbuf + i * 4; u->urb->transfer_dma = ep->sync_dma + i * 4; u->urb->transfer_buffer_length = 4; u->urb->pipe = ep->pipe; |
c75c5ab57 ALSA: USB: adjust... |
740 |
u->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; |
8fdff6a31 ALSA: snd-usb: im... |
741 742 743 744 745 746 747 748 749 750 751 752 753 754 |
u->urb->number_of_packets = 1; u->urb->interval = 1 << ep->syncinterval; u->urb->context = u; u->urb->complete = snd_complete_urb; } ep->nurbs = SYNC_URBS; return 0; out_of_memory: release_urbs(ep, 0); return -ENOMEM; } |
94c27215b ALSA: snd-usb: ad... |
755 |
/** |
07a5e9d4f ALSA: snd-usb: fi... |
756 |
* snd_usb_endpoint_set_params: configure an snd_usb_endpoint |
94c27215b ALSA: snd-usb: ad... |
757 |
* |
07a5e9d4f ALSA: snd-usb: fi... |
758 |
* @ep: the snd_usb_endpoint to configure |
35ec7aa29 ALSA: usb-audio: ... |
759 760 761 |
* @pcm_format: the audio fomat. * @channels: the number of audio channels. * @period_bytes: the number of bytes in one alsa period. |
976b6c064 ALSA: improve buf... |
762 763 |
* @period_frames: the number of frames in one alsa period. * @buffer_periods: the number of periods in one alsa buffer. |
35ec7aa29 ALSA: usb-audio: ... |
764 |
* @rate: the frame rate. |
07a5e9d4f ALSA: snd-usb: fi... |
765 766 |
* @fmt: the USB audio format information * @sync_ep: the sync endpoint to use, if any |
94c27215b ALSA: snd-usb: ad... |
767 |
* |
07a5e9d4f ALSA: snd-usb: fi... |
768 |
* Determine the number of URBs to be used on this endpoint. |
94c27215b ALSA: snd-usb: ad... |
769 770 771 |
* An endpoint must be configured before it can be started. * An endpoint that is already running can not be reconfigured. */ |
8fdff6a31 ALSA: snd-usb: im... |
772 |
int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep, |
35ec7aa29 ALSA: usb-audio: ... |
773 774 775 |
snd_pcm_format_t pcm_format, unsigned int channels, unsigned int period_bytes, |
976b6c064 ALSA: improve buf... |
776 777 |
unsigned int period_frames, unsigned int buffer_periods, |
35ec7aa29 ALSA: usb-audio: ... |
778 |
unsigned int rate, |
8fdff6a31 ALSA: snd-usb: im... |
779 780 781 782 783 784 |
struct audioformat *fmt, struct snd_usb_endpoint *sync_ep) { int err; if (ep->use_count != 0) { |
0ba41d917 ALSA: usb-audio: ... |
785 786 787 788 |
usb_audio_warn(ep->chip, "Unable to change format on ep #%x: already in use ", ep->ep_num); |
8fdff6a31 ALSA: snd-usb: im... |
789 790 791 792 793 794 795 796 |
return -EBUSY; } /* release old buffers, if any */ release_urbs(ep, 0); ep->datainterval = fmt->datainterval; ep->maxpacksize = fmt->maxpacksize; |
85f71932e ALSA: usb: Fix fi... |
797 |
ep->fill_max = !!(fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX); |
8fdff6a31 ALSA: snd-usb: im... |
798 799 |
if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_FULL) |
35ec7aa29 ALSA: usb-audio: ... |
800 |
ep->freqn = get_usb_full_speed_rate(rate); |
8fdff6a31 ALSA: snd-usb: im... |
801 |
else |
35ec7aa29 ALSA: usb-audio: ... |
802 |
ep->freqn = get_usb_high_speed_rate(rate); |
8fdff6a31 ALSA: snd-usb: im... |
803 804 805 806 807 808 809 810 811 |
/* calculate the frequency in 16.16 format */ ep->freqm = ep->freqn; ep->freqshift = INT_MIN; ep->phase = 0; switch (ep->type) { case SND_USB_ENDPOINT_TYPE_DATA: |
35ec7aa29 ALSA: usb-audio: ... |
812 |
err = data_ep_set_params(ep, pcm_format, channels, |
976b6c064 ALSA: improve buf... |
813 814 |
period_bytes, period_frames, buffer_periods, fmt, sync_ep); |
8fdff6a31 ALSA: snd-usb: im... |
815 816 |
break; case SND_USB_ENDPOINT_TYPE_SYNC: |
937210399 ALSA: usb-audio: ... |
817 |
err = sync_ep_set_params(ep); |
8fdff6a31 ALSA: snd-usb: im... |
818 819 820 821 |
break; default: err = -EINVAL; } |
0ba41d917 ALSA: usb-audio: ... |
822 823 824 825 |
usb_audio_dbg(ep->chip, "Setting params for ep #%x (type %d, %d urbs), ret=%d ", ep->ep_num, ep->type, ep->nurbs, err); |
8fdff6a31 ALSA: snd-usb: im... |
826 827 828 |
return err; } |
94c27215b ALSA: snd-usb: ad... |
829 830 831 |
/** * snd_usb_endpoint_start: start an snd_usb_endpoint * |
015618b90 ALSA: snd-usb: Fi... |
832 833 834 |
* @ep: the endpoint to start * @can_sleep: flag indicating whether the operation is executed in * non-atomic context |
94c27215b ALSA: snd-usb: ad... |
835 836 |
* * A call to this function will increment the use count of the endpoint. |
07a5e9d4f ALSA: snd-usb: fi... |
837 |
* In case it is not already running, the URBs for this endpoint will be |
94c27215b ALSA: snd-usb: ad... |
838 839 840 841 842 843 |
* submitted. Otherwise, this function does nothing. * * Must be balanced to calls of snd_usb_endpoint_stop(). * * Returns an error if the URB submission failed, 0 in all other cases. */ |
a9bb36261 ALSA: usb-audio: ... |
844 |
int snd_usb_endpoint_start(struct snd_usb_endpoint *ep, bool can_sleep) |
8fdff6a31 ALSA: snd-usb: im... |
845 846 847 848 849 850 851 852 853 854 |
{ int err; unsigned int i; if (ep->chip->shutdown) return -EBADFD; /* already running? */ if (++ep->use_count != 1) return 0; |
015618b90 ALSA: snd-usb: Fi... |
855 |
/* just to be sure */ |
ccc1696d5 ALSA: usb-audio: ... |
856 |
deactivate_urbs(ep, false); |
015618b90 ALSA: snd-usb: Fi... |
857 858 |
if (can_sleep) wait_clear_urbs(ep); |
8fdff6a31 ALSA: snd-usb: im... |
859 860 861 |
ep->active_mask = 0; ep->unlink_mask = 0; ep->phase = 0; |
2b58fd5b3 ALSA: snd-usb: Ad... |
862 |
snd_usb_endpoint_start_quirk(ep); |
8fdff6a31 ALSA: snd-usb: im... |
863 864 865 |
/* * If this endpoint has a data endpoint as implicit feedback source, * don't start the urbs here. Instead, mark them all as available, |
07a5e9d4f ALSA: snd-usb: fi... |
866 867 |
* wait for the record urbs to return and queue the playback urbs * from that context. |
8fdff6a31 ALSA: snd-usb: im... |
868 869 870 |
*/ set_bit(EP_FLAG_RUNNING, &ep->flags); |
98ae472b5 ALSA: usb-audio: ... |
871 |
if (snd_usb_endpoint_implicit_feedback_sink(ep)) { |
8fdff6a31 ALSA: snd-usb: im... |
872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 |
for (i = 0; i < ep->nurbs; i++) { struct snd_urb_ctx *ctx = ep->urb + i; list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs); } return 0; } for (i = 0; i < ep->nurbs; i++) { struct urb *urb = ep->urb[i].urb; if (snd_BUG_ON(!urb)) goto __error; if (usb_pipeout(ep->pipe)) { |
8fdff6a31 ALSA: snd-usb: im... |
887 888 889 890 891 892 893 |
prepare_outbound_urb(ep, urb->context); } else { prepare_inbound_urb(ep, urb->context); } err = usb_submit_urb(urb, GFP_ATOMIC); if (err < 0) { |
0ba41d917 ALSA: usb-audio: ... |
894 895 896 897 |
usb_audio_err(ep->chip, "cannot submit urb %d, error %d: %s ", i, err, usb_error_string(err)); |
8fdff6a31 ALSA: snd-usb: im... |
898 899 900 901 902 903 904 905 906 907 |
goto __error; } set_bit(i, &ep->active_mask); } return 0; __error: clear_bit(EP_FLAG_RUNNING, &ep->flags); ep->use_count--; |
ccc1696d5 ALSA: usb-audio: ... |
908 |
deactivate_urbs(ep, false); |
8fdff6a31 ALSA: snd-usb: im... |
909 910 |
return -EPIPE; } |
94c27215b ALSA: snd-usb: ad... |
911 912 913 914 915 916 917 |
/** * snd_usb_endpoint_stop: stop an snd_usb_endpoint * * @ep: the endpoint to stop (may be NULL) * * A call to this function will decrement the use count of the endpoint. * In case the last user has requested the endpoint stop, the URBs will |
07a5e9d4f ALSA: snd-usb: fi... |
918 |
* actually be deactivated. |
94c27215b ALSA: snd-usb: ad... |
919 920 |
* * Must be balanced to calls of snd_usb_endpoint_start(). |
b2eb950de ALSA: usb-audio: ... |
921 922 923 |
* * The caller needs to synchronize the pending stop operation via * snd_usb_endpoint_sync_pending_stop(). |
94c27215b ALSA: snd-usb: ad... |
924 |
*/ |
b2eb950de ALSA: usb-audio: ... |
925 |
void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep) |
8fdff6a31 ALSA: snd-usb: im... |
926 927 928 929 930 931 |
{ if (!ep) return; if (snd_BUG_ON(ep->use_count == 0)) return; |
8fdff6a31 ALSA: snd-usb: im... |
932 |
if (--ep->use_count == 0) { |
ccc1696d5 ALSA: usb-audio: ... |
933 |
deactivate_urbs(ep, false); |
8fdff6a31 ALSA: snd-usb: im... |
934 935 936 937 |
ep->data_subs = NULL; ep->sync_slave = NULL; ep->retire_data_urb = NULL; ep->prepare_data_urb = NULL; |
b2eb950de ALSA: usb-audio: ... |
938 |
set_bit(EP_FLAG_STOPPING, &ep->flags); |
8fdff6a31 ALSA: snd-usb: im... |
939 940 |
} } |
94c27215b ALSA: snd-usb: ad... |
941 |
/** |
94c27215b ALSA: snd-usb: ad... |
942 943 944 945 |
* snd_usb_endpoint_deactivate: deactivate an snd_usb_endpoint * * @ep: the endpoint to deactivate * |
9b7c552bb ALSA: usb-audio: ... |
946 947 |
* If the endpoint is not currently in use, this functions will * deactivate its associated URBs. |
94c27215b ALSA: snd-usb: ad... |
948 949 |
* * In case of any active users, this functions does nothing. |
94c27215b ALSA: snd-usb: ad... |
950 |
*/ |
9b7c552bb ALSA: usb-audio: ... |
951 |
void snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep) |
8fdff6a31 ALSA: snd-usb: im... |
952 953 |
{ if (!ep) |
9b7c552bb ALSA: usb-audio: ... |
954 |
return; |
8fdff6a31 ALSA: snd-usb: im... |
955 956 |
if (ep->use_count != 0) |
9b7c552bb ALSA: usb-audio: ... |
957 |
return; |
8fdff6a31 ALSA: snd-usb: im... |
958 |
|
239b9f799 ALSA: usb-audio: ... |
959 960 |
deactivate_urbs(ep, true); wait_clear_urbs(ep); |
8fdff6a31 ALSA: snd-usb: im... |
961 |
} |
07a5e9d4f ALSA: snd-usb: fi... |
962 |
/** |
92a586bdc ALSA: usb-audio: ... |
963 964 965 966 967 968 969 970 971 972 973 974 975 |
* snd_usb_endpoint_release: Tear down an snd_usb_endpoint * * @ep: the endpoint to release * * This function does not care for the endpoint's use count but will tear * down all the streaming URBs immediately. */ void snd_usb_endpoint_release(struct snd_usb_endpoint *ep) { release_urbs(ep, 1); } /** |
07a5e9d4f ALSA: snd-usb: fi... |
976 |
* snd_usb_endpoint_free: Free the resources of an snd_usb_endpoint |
94c27215b ALSA: snd-usb: ad... |
977 |
* |
a6cece9d8 ALSA: usb-audio: ... |
978 |
* @ep: the endpoint to free |
94c27215b ALSA: snd-usb: ad... |
979 |
* |
92a586bdc ALSA: usb-audio: ... |
980 |
* This free all resources of the given ep. |
94c27215b ALSA: snd-usb: ad... |
981 |
*/ |
a6cece9d8 ALSA: usb-audio: ... |
982 |
void snd_usb_endpoint_free(struct snd_usb_endpoint *ep) |
8fdff6a31 ALSA: snd-usb: im... |
983 |
{ |
8fdff6a31 ALSA: snd-usb: im... |
984 985 |
kfree(ep); } |
94c27215b ALSA: snd-usb: ad... |
986 987 988 989 990 991 992 993 994 |
/** * snd_usb_handle_sync_urb: parse an USB sync packet * * @ep: the endpoint to handle the packet * @sender: the sending endpoint * @urb: the received packet * * This function is called from the context of an endpoint that received * the packet and is used to let another endpoint object handle the payload. |
8fdff6a31 ALSA: snd-usb: im... |
995 996 997 998 999 1000 1001 1002 1003 1004 |
*/ void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep, struct snd_usb_endpoint *sender, const struct urb *urb) { int shift; unsigned int f; unsigned long flags; snd_BUG_ON(ep == sender); |
94c27215b ALSA: snd-usb: ad... |
1005 1006 |
/* * In case the endpoint is operating in implicit feedback mode, prepare |
07a5e9d4f ALSA: snd-usb: fi... |
1007 1008 1009 |
* a new outbound URB that has the same layout as the received packet * and add it to the list of pending urbs. queue_pending_output_urbs() * will take care of them later. |
94c27215b ALSA: snd-usb: ad... |
1010 |
*/ |
98ae472b5 ALSA: usb-audio: ... |
1011 |
if (snd_usb_endpoint_implicit_feedback_sink(ep) && |
8fdff6a31 ALSA: snd-usb: im... |
1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 |
ep->use_count != 0) { /* implicit feedback case */ int i, bytes = 0; struct snd_urb_ctx *in_ctx; struct snd_usb_packet_info *out_packet; in_ctx = urb->context; /* Count overall packet size */ for (i = 0; i < in_ctx->packets; i++) if (urb->iso_frame_desc[i].status == 0) bytes += urb->iso_frame_desc[i].actual_length; /* * skip empty packets. At least M-Audio's Fast Track Ultra stops * streaming once it received a 0-byte OUT URB */ if (bytes == 0) return; spin_lock_irqsave(&ep->lock, flags); out_packet = ep->next_packet + ep->next_packet_write_pos; /* * Iterate through the inbound packet and prepare the lengths * for the output packet. The OUT packet we are about to send |
28acb1201 ALSA: usb-audio: ... |
1039 1040 1041 1042 1043 |
* will have the same amount of payload bytes per stride as the * IN packet we just received. Since the actual size is scaled * by the stride, use the sender stride to calculate the length * in case the number of channels differ between the implicitly * fed-back endpoint and the synchronizing endpoint. |
8fdff6a31 ALSA: snd-usb: im... |
1044 1045 1046 1047 1048 1049 |
*/ out_packet->packets = in_ctx->packets; for (i = 0; i < in_ctx->packets; i++) { if (urb->iso_frame_desc[i].status == 0) out_packet->packet_size[i] = |
28acb1201 ALSA: usb-audio: ... |
1050 |
urb->iso_frame_desc[i].actual_length / sender->stride; |
8fdff6a31 ALSA: snd-usb: im... |
1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 |
else out_packet->packet_size[i] = 0; } ep->next_packet_write_pos++; ep->next_packet_write_pos %= MAX_URBS; spin_unlock_irqrestore(&ep->lock, flags); queue_pending_output_urbs(ep); return; } |
94c27215b ALSA: snd-usb: ad... |
1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 |
/* * process after playback sync complete * * Full speed devices report feedback values in 10.14 format as samples * per frame, high speed devices in 16.16 format as samples per * microframe. * * Because the Audio Class 1 spec was written before USB 2.0, many high * speed devices use a wrong interpretation, some others use an * entirely different format. * * Therefore, we cannot predict what format any particular device uses * and must detect it automatically. */ |
8fdff6a31 ALSA: snd-usb: im... |
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if (urb->iso_frame_desc[0].status != 0 || urb->iso_frame_desc[0].actual_length < 3) return; f = le32_to_cpup(urb->transfer_buffer); if (urb->iso_frame_desc[0].actual_length == 3) f &= 0x00ffffff; else f &= 0x0fffffff; if (f == 0) return; |
7040b6d1f ALSA: usb-audio: ... |
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if (unlikely(sender->udh01_fb_quirk)) { /* * The TEAC UD-H01 firmware sometimes changes the feedback value * by +/- 0x1.0000. */ if (f < ep->freqn - 0x8000) f += 0x10000; else if (f > ep->freqn + 0x8000) f -= 0x10000; } else if (unlikely(ep->freqshift == INT_MIN)) { |
8fdff6a31 ALSA: snd-usb: im... |
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/* * The first time we see a feedback value, determine its format * by shifting it left or right until it matches the nominal * frequency value. This assumes that the feedback does not * differ from the nominal value more than +50% or -25%. */ shift = 0; while (f < ep->freqn - ep->freqn / 4) { f <<= 1; shift++; } while (f > ep->freqn + ep->freqn / 2) { f >>= 1; shift--; } ep->freqshift = shift; } else if (ep->freqshift >= 0) f <<= ep->freqshift; else f >>= -ep->freqshift; if (likely(f >= ep->freqn - ep->freqn / 8 && f <= ep->freqmax)) { /* * If the frequency looks valid, set it. * This value is referred to in prepare_playback_urb(). */ spin_lock_irqsave(&ep->lock, flags); ep->freqm = f; spin_unlock_irqrestore(&ep->lock, flags); } else { /* * Out of range; maybe the shift value is wrong. * Reset it so that we autodetect again the next time. */ ep->freqshift = INT_MIN; } } |