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sound/usb/endpoint.c
33 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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static void prepare_silent_urb(struct snd_usb_endpoint *ep, struct snd_urb_ctx *ctx) { struct urb *urb = ctx->urb; unsigned int offs = 0; |
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unsigned int extra = 0; __le32 packet_length; |
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int i; |
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/* For tx_length_quirk, put packet length at start of packet */ if (ep->chip->tx_length_quirk) extra = sizeof(packet_length); |
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for (i = 0; i < ctx->packets; ++i) { |
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unsigned int offset; unsigned int length; |
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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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length = counts * ep->stride; /* number of silent bytes */ offset = offs * ep->stride + extra * i; urb->iso_frame_desc[i].offset = offset; urb->iso_frame_desc[i].length = length + extra; if (extra) { packet_length = cpu_to_le32(length); memcpy(urb->transfer_buffer + offset, &packet_length, sizeof(packet_length)); } memset(urb->transfer_buffer + offset + extra, ep->silence_value, length); |
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offs += counts; } urb->number_of_packets = ctx->packets; |
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urb->transfer_buffer_length = offs * ep->stride + ctx->packets * extra; |
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} |
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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) { |
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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 */ |
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prepare_silent_urb(ep, ctx); |
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} 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 */ |
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urb->status == -ESHUTDOWN)) /* device disabled */ goto exit_clear; /* device disconnected */ if (unlikely(atomic_read(&ep->chip->shutdown))) |
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goto exit_clear; |
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if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags))) goto exit_clear; |
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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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* * For SND_USB_ENDPOINT_TYPE_SYNC, the caller needs to guarantee that * bNumEndpoints > 1 beforehand. |
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*/ |
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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); } 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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|
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ep->data_subs = NULL; ep->sync_slave = NULL; ep->retire_data_urb = NULL; ep->prepare_data_urb = NULL; |
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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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|
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if (!force && atomic_read(&ep->chip->shutdown)) /* to be sure... */ |
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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; |
8fdff6a31 ALSA: snd-usb: im... |
551 552 553 554 |
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; |
ccc1696d5 ALSA: usb-audio: ... |
555 |
usb_unlink_urb(u); |
8fdff6a31 ALSA: snd-usb: im... |
556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 |
} } } 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 */ |
ccc1696d5 ALSA: usb-audio: ... |
575 |
deactivate_urbs(ep, force); |
8fdff6a31 ALSA: snd-usb: im... |
576 577 578 579 580 581 582 583 584 585 586 587 |
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; } |
94c27215b ALSA: snd-usb: ad... |
588 589 590 |
/* * configure a data endpoint */ |
8fdff6a31 ALSA: snd-usb: im... |
591 |
static int data_ep_set_params(struct snd_usb_endpoint *ep, |
35ec7aa29 ALSA: usb-audio: ... |
592 593 594 |
snd_pcm_format_t pcm_format, unsigned int channels, unsigned int period_bytes, |
976b6c064 ALSA: improve buf... |
595 596 |
unsigned int frames_per_period, unsigned int periods_per_buffer, |
8fdff6a31 ALSA: snd-usb: im... |
597 598 599 |
struct audioformat *fmt, struct snd_usb_endpoint *sync_ep) { |
976b6c064 ALSA: improve buf... |
600 601 602 |
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; |
35ec7aa29 ALSA: usb-audio: ... |
603 |
int frame_bits = snd_pcm_format_physical_width(pcm_format) * channels; |
759c90fe0 ALSA: USB-audio: ... |
604 605 |
int tx_length_quirk = (ep->chip->tx_length_quirk && usb_pipeout(ep->pipe)); |
8fdff6a31 ALSA: snd-usb: im... |
606 |
|
d24f5061e ALSA: snd-usb: ad... |
607 608 609 610 611 612 613 614 |
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... |
615 616 |
ep->datainterval = fmt->datainterval; ep->stride = frame_bits >> 3; |
012007309 ALSA: usb-audio: ... |
617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 |
switch (pcm_format) { case SNDRV_PCM_FORMAT_U8: ep->silence_value = 0x80; break; case SNDRV_PCM_FORMAT_DSD_U8: case SNDRV_PCM_FORMAT_DSD_U16_LE: case SNDRV_PCM_FORMAT_DSD_U32_LE: case SNDRV_PCM_FORMAT_DSD_U16_BE: case SNDRV_PCM_FORMAT_DSD_U32_BE: ep->silence_value = 0x69; break; default: ep->silence_value = 0; } |
8fdff6a31 ALSA: snd-usb: im... |
632 |
|
fd1a50596 ALSA: usb-audio: ... |
633 634 |
/* assume max. frequency is 50% higher than nominal */ ep->freqmax = ep->freqn + (ep->freqn >> 1); |
ab30965d9 ALSA: usb-audio: ... |
635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 |
/* Round up freqmax to nearest integer in order to calculate maximum * packet size, which must represent a whole number of frames. * This is accomplished by adding 0x0.ffff before converting the * Q16.16 format into integer. * In order to accurately calculate the maximum packet size when * the data interval is more than 1 (i.e. ep->datainterval > 0), * multiply by the data interval prior to rounding. For instance, * a freqmax of 41 kHz will result in a max packet size of 6 (5.125) * frames with a data interval of 1, but 11 (10.25) frames with a * data interval of 2. * (ep->freqmax << ep->datainterval overflows at 8.192 MHz for the * maximum datainterval value of 3, at USB full speed, higher for * USB high speed, noting that ep->freqmax is in units of * frames per packet in Q16.16 format.) */ maxsize = (((ep->freqmax << ep->datainterval) + 0xffff) >> 16) * (frame_bits >> 3); |
759c90fe0 ALSA: USB-audio: ... |
652 653 |
if (tx_length_quirk) maxsize += sizeof(__le32); /* Space for length descriptor */ |
57e6dae10 ALSA: usb-audio: ... |
654 655 |
/* but wMaxPacketSize might reduce this */ if (ep->maxpacksize && ep->maxpacksize < maxsize) { |
8fdff6a31 ALSA: snd-usb: im... |
656 |
/* whatever fits into a max. size packet */ |
759c90fe0 ALSA: USB-audio: ... |
657 658 659 660 661 662 |
unsigned int data_maxsize = maxsize = ep->maxpacksize; if (tx_length_quirk) /* Need to remove the length descriptor to calc freq */ data_maxsize -= sizeof(__le32); ep->freqmax = (data_maxsize / (frame_bits >> 3)) |
8fdff6a31 ALSA: snd-usb: im... |
663 |
<< (16 - ep->datainterval); |
8fdff6a31 ALSA: snd-usb: im... |
664 665 666 667 668 669 |
} if (ep->fill_max) ep->curpacksize = ep->maxpacksize; else ep->curpacksize = maxsize; |
976b6c064 ALSA: improve buf... |
670 |
if (snd_usb_get_speed(ep->chip->dev) != USB_SPEED_FULL) { |
8fdff6a31 ALSA: snd-usb: im... |
671 |
packs_per_ms = 8 >> ep->datainterval; |
976b6c064 ALSA: improve buf... |
672 |
max_packs_per_urb = MAX_PACKS_HS; |
8fdff6a31 ALSA: snd-usb: im... |
673 |
} else { |
976b6c064 ALSA: improve buf... |
674 675 |
packs_per_ms = 1; max_packs_per_urb = MAX_PACKS; |
8fdff6a31 ALSA: snd-usb: im... |
676 |
} |
98ae472b5 ALSA: usb-audio: ... |
677 |
if (sync_ep && !snd_usb_endpoint_implicit_feedback_sink(ep)) |
976b6c064 ALSA: improve buf... |
678 679 680 681 682 683 684 685 686 687 688 689 690 691 |
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... |
692 693 694 695 696 697 698 699 700 701 702 703 704 705 |
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... |
706 |
/* make capture URBs <= 1 ms and smaller than a period */ |
a93455e1c ALSA: usb: use mu... |
707 |
urb_packs = min(max_packs_per_urb, urb_packs); |
976b6c064 ALSA: improve buf... |
708 709 710 |
while (urb_packs > 1 && urb_packs * maxsize >= period_bytes) urb_packs >>= 1; ep->nurbs = MAX_URBS; |
8fdff6a31 ALSA: snd-usb: im... |
711 |
|
976b6c064 ALSA: improve buf... |
712 713 714 715 716 717 718 |
/* * 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... |
719 |
/* determine how small a packet can be */ |
976b6c064 ALSA: improve buf... |
720 721 |
minsize = (ep->freqn >> (16 - ep->datainterval)) * (frame_bits >> 3); |
8fdff6a31 ALSA: snd-usb: im... |
722 723 724 725 |
/* 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... |
726 |
|
976b6c064 ALSA: improve buf... |
727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 |
/* 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... |
744 745 746 747 748 749 750 |
} /* 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... |
751 |
u->packets = urb_packs; |
8fdff6a31 ALSA: snd-usb: im... |
752 753 754 755 756 757 758 759 760 761 762 763 764 765 |
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... |
766 |
u->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; |
8fdff6a31 ALSA: snd-usb: im... |
767 768 769 770 771 772 773 774 775 776 777 778 |
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... |
779 780 781 |
/* * configure a sync endpoint */ |
937210399 ALSA: usb-audio: ... |
782 |
static int sync_ep_set_params(struct snd_usb_endpoint *ep) |
8fdff6a31 ALSA: snd-usb: im... |
783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 |
{ 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... |
803 |
u->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; |
8fdff6a31 ALSA: snd-usb: im... |
804 805 806 807 808 809 810 811 812 813 814 815 816 817 |
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... |
818 |
/** |
07a5e9d4f ALSA: snd-usb: fi... |
819 |
* snd_usb_endpoint_set_params: configure an snd_usb_endpoint |
94c27215b ALSA: snd-usb: ad... |
820 |
* |
07a5e9d4f ALSA: snd-usb: fi... |
821 |
* @ep: the snd_usb_endpoint to configure |
35ec7aa29 ALSA: usb-audio: ... |
822 823 824 |
* @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... |
825 826 |
* @period_frames: the number of frames in one alsa period. * @buffer_periods: the number of periods in one alsa buffer. |
35ec7aa29 ALSA: usb-audio: ... |
827 |
* @rate: the frame rate. |
07a5e9d4f ALSA: snd-usb: fi... |
828 829 |
* @fmt: the USB audio format information * @sync_ep: the sync endpoint to use, if any |
94c27215b ALSA: snd-usb: ad... |
830 |
* |
07a5e9d4f ALSA: snd-usb: fi... |
831 |
* Determine the number of URBs to be used on this endpoint. |
94c27215b ALSA: snd-usb: ad... |
832 833 834 |
* 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... |
835 |
int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep, |
35ec7aa29 ALSA: usb-audio: ... |
836 837 838 |
snd_pcm_format_t pcm_format, unsigned int channels, unsigned int period_bytes, |
976b6c064 ALSA: improve buf... |
839 840 |
unsigned int period_frames, unsigned int buffer_periods, |
35ec7aa29 ALSA: usb-audio: ... |
841 |
unsigned int rate, |
8fdff6a31 ALSA: snd-usb: im... |
842 843 844 845 846 847 |
struct audioformat *fmt, struct snd_usb_endpoint *sync_ep) { int err; if (ep->use_count != 0) { |
0ba41d917 ALSA: usb-audio: ... |
848 849 850 851 |
usb_audio_warn(ep->chip, "Unable to change format on ep #%x: already in use ", ep->ep_num); |
8fdff6a31 ALSA: snd-usb: im... |
852 853 854 855 856 857 858 859 |
return -EBUSY; } /* release old buffers, if any */ release_urbs(ep, 0); ep->datainterval = fmt->datainterval; ep->maxpacksize = fmt->maxpacksize; |
85f71932e ALSA: usb: Fix fi... |
860 |
ep->fill_max = !!(fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX); |
8fdff6a31 ALSA: snd-usb: im... |
861 862 |
if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_FULL) |
35ec7aa29 ALSA: usb-audio: ... |
863 |
ep->freqn = get_usb_full_speed_rate(rate); |
8fdff6a31 ALSA: snd-usb: im... |
864 |
else |
35ec7aa29 ALSA: usb-audio: ... |
865 |
ep->freqn = get_usb_high_speed_rate(rate); |
8fdff6a31 ALSA: snd-usb: im... |
866 867 868 869 870 871 872 873 874 |
/* 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: ... |
875 |
err = data_ep_set_params(ep, pcm_format, channels, |
976b6c064 ALSA: improve buf... |
876 877 |
period_bytes, period_frames, buffer_periods, fmt, sync_ep); |
8fdff6a31 ALSA: snd-usb: im... |
878 879 |
break; case SND_USB_ENDPOINT_TYPE_SYNC: |
937210399 ALSA: usb-audio: ... |
880 |
err = sync_ep_set_params(ep); |
8fdff6a31 ALSA: snd-usb: im... |
881 882 883 884 |
break; default: err = -EINVAL; } |
0ba41d917 ALSA: usb-audio: ... |
885 886 887 888 |
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... |
889 890 891 |
return err; } |
94c27215b ALSA: snd-usb: ad... |
892 893 894 |
/** * snd_usb_endpoint_start: start an snd_usb_endpoint * |
1d0f95308 ALSA: usb-audio: ... |
895 |
* @ep: the endpoint to start |
94c27215b ALSA: snd-usb: ad... |
896 897 |
* * A call to this function will increment the use count of the endpoint. |
07a5e9d4f ALSA: snd-usb: fi... |
898 |
* In case it is not already running, the URBs for this endpoint will be |
94c27215b ALSA: snd-usb: ad... |
899 900 901 902 903 904 |
* 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. */ |
1d0f95308 ALSA: usb-audio: ... |
905 |
int snd_usb_endpoint_start(struct snd_usb_endpoint *ep) |
8fdff6a31 ALSA: snd-usb: im... |
906 907 908 |
{ int err; unsigned int i; |
47ab15459 ALSA: usb-audio: ... |
909 |
if (atomic_read(&ep->chip->shutdown)) |
8fdff6a31 ALSA: snd-usb: im... |
910 911 912 913 914 |
return -EBADFD; /* already running? */ if (++ep->use_count != 1) return 0; |
015618b90 ALSA: snd-usb: Fi... |
915 |
/* just to be sure */ |
ccc1696d5 ALSA: usb-audio: ... |
916 |
deactivate_urbs(ep, false); |
015618b90 ALSA: snd-usb: Fi... |
917 |
|
8fdff6a31 ALSA: snd-usb: im... |
918 919 920 |
ep->active_mask = 0; ep->unlink_mask = 0; ep->phase = 0; |
2b58fd5b3 ALSA: snd-usb: Ad... |
921 |
snd_usb_endpoint_start_quirk(ep); |
8fdff6a31 ALSA: snd-usb: im... |
922 923 924 |
/* * 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... |
925 926 |
* wait for the record urbs to return and queue the playback urbs * from that context. |
8fdff6a31 ALSA: snd-usb: im... |
927 928 929 |
*/ set_bit(EP_FLAG_RUNNING, &ep->flags); |
98ae472b5 ALSA: usb-audio: ... |
930 |
if (snd_usb_endpoint_implicit_feedback_sink(ep)) { |
8fdff6a31 ALSA: snd-usb: im... |
931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 |
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... |
946 947 948 949 950 951 952 |
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: ... |
953 954 955 956 |
usb_audio_err(ep->chip, "cannot submit urb %d, error %d: %s ", i, err, usb_error_string(err)); |
8fdff6a31 ALSA: snd-usb: im... |
957 958 959 960 961 962 963 964 965 966 |
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: ... |
967 |
deactivate_urbs(ep, false); |
8fdff6a31 ALSA: snd-usb: im... |
968 969 |
return -EPIPE; } |
94c27215b ALSA: snd-usb: ad... |
970 971 972 973 974 975 976 |
/** * 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... |
977 |
* actually be deactivated. |
94c27215b ALSA: snd-usb: ad... |
978 979 |
* * Must be balanced to calls of snd_usb_endpoint_start(). |
b2eb950de ALSA: usb-audio: ... |
980 981 982 |
* * The caller needs to synchronize the pending stop operation via * snd_usb_endpoint_sync_pending_stop(). |
94c27215b ALSA: snd-usb: ad... |
983 |
*/ |
b2eb950de ALSA: usb-audio: ... |
984 |
void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep) |
8fdff6a31 ALSA: snd-usb: im... |
985 986 987 988 989 990 |
{ if (!ep) return; if (snd_BUG_ON(ep->use_count == 0)) return; |
8fdff6a31 ALSA: snd-usb: im... |
991 |
if (--ep->use_count == 0) { |
ccc1696d5 ALSA: usb-audio: ... |
992 |
deactivate_urbs(ep, false); |
b2eb950de ALSA: usb-audio: ... |
993 |
set_bit(EP_FLAG_STOPPING, &ep->flags); |
8fdff6a31 ALSA: snd-usb: im... |
994 995 |
} } |
94c27215b ALSA: snd-usb: ad... |
996 |
/** |
94c27215b ALSA: snd-usb: ad... |
997 998 999 1000 |
* snd_usb_endpoint_deactivate: deactivate an snd_usb_endpoint * * @ep: the endpoint to deactivate * |
9b7c552bb ALSA: usb-audio: ... |
1001 1002 |
* If the endpoint is not currently in use, this functions will * deactivate its associated URBs. |
94c27215b ALSA: snd-usb: ad... |
1003 1004 |
* * In case of any active users, this functions does nothing. |
94c27215b ALSA: snd-usb: ad... |
1005 |
*/ |
9b7c552bb ALSA: usb-audio: ... |
1006 |
void snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep) |
8fdff6a31 ALSA: snd-usb: im... |
1007 1008 |
{ if (!ep) |
9b7c552bb ALSA: usb-audio: ... |
1009 |
return; |
8fdff6a31 ALSA: snd-usb: im... |
1010 1011 |
if (ep->use_count != 0) |
9b7c552bb ALSA: usb-audio: ... |
1012 |
return; |
8fdff6a31 ALSA: snd-usb: im... |
1013 |
|
239b9f799 ALSA: usb-audio: ... |
1014 1015 |
deactivate_urbs(ep, true); wait_clear_urbs(ep); |
8fdff6a31 ALSA: snd-usb: im... |
1016 |
} |
07a5e9d4f ALSA: snd-usb: fi... |
1017 |
/** |
92a586bdc ALSA: usb-audio: ... |
1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 |
* 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... |
1031 |
* snd_usb_endpoint_free: Free the resources of an snd_usb_endpoint |
94c27215b ALSA: snd-usb: ad... |
1032 |
* |
a6cece9d8 ALSA: usb-audio: ... |
1033 |
* @ep: the endpoint to free |
94c27215b ALSA: snd-usb: ad... |
1034 |
* |
92a586bdc ALSA: usb-audio: ... |
1035 |
* This free all resources of the given ep. |
94c27215b ALSA: snd-usb: ad... |
1036 |
*/ |
a6cece9d8 ALSA: usb-audio: ... |
1037 |
void snd_usb_endpoint_free(struct snd_usb_endpoint *ep) |
8fdff6a31 ALSA: snd-usb: im... |
1038 |
{ |
8fdff6a31 ALSA: snd-usb: im... |
1039 1040 |
kfree(ep); } |
94c27215b ALSA: snd-usb: ad... |
1041 1042 1043 1044 1045 1046 1047 1048 1049 |
/** * 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... |
1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 |
*/ 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... |
1060 1061 |
/* * In case the endpoint is operating in implicit feedback mode, prepare |
07a5e9d4f ALSA: snd-usb: fi... |
1062 1063 1064 |
* 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... |
1065 |
*/ |
98ae472b5 ALSA: usb-audio: ... |
1066 |
if (snd_usb_endpoint_implicit_feedback_sink(ep) && |
8fdff6a31 ALSA: snd-usb: im... |
1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 |
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: ... |
1094 1095 1096 1097 1098 |
* 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... |
1099 1100 1101 1102 1103 1104 |
*/ 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: ... |
1105 |
urb->iso_frame_desc[i].actual_length / sender->stride; |
8fdff6a31 ALSA: snd-usb: im... |
1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 |
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... |
1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 |
/* * 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... |
1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 |
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; |
ca0dd2736 ALSA: usb: use TE... |
1144 |
if (unlikely(sender->tenor_fb_quirk)) { |
7040b6d1f ALSA: usb-audio: ... |
1145 |
/* |
ca0dd2736 ALSA: usb: use TE... |
1146 1147 |
* Devices based on Tenor 8802 chipsets (TEAC UD-H01 * and others) sometimes change the feedback value |
7040b6d1f ALSA: usb-audio: ... |
1148 1149 1150 |
* by +/- 0x1.0000. */ if (f < ep->freqn - 0x8000) |
36e1ac3cf ALSA: usb: fine-t... |
1151 |
f += 0xf000; |
7040b6d1f ALSA: usb-audio: ... |
1152 |
else if (f > ep->freqn + 0x8000) |
36e1ac3cf ALSA: usb: fine-t... |
1153 |
f -= 0xf000; |
7040b6d1f ALSA: usb-audio: ... |
1154 |
} else if (unlikely(ep->freqshift == INT_MIN)) { |
8fdff6a31 ALSA: snd-usb: im... |
1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 |
/* * 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; } } |