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607 lines
14 KiB
607 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* u_audio.c -- interface to USB gadget "ALSA sound card" utilities |
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* |
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* Copyright (C) 2016 |
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* Author: Ruslan Bilovol <[email protected]> |
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* |
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* Sound card implementation was cut-and-pasted with changes |
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* from f_uac2.c and has: |
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* Copyright (C) 2011 |
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* Yadwinder Singh ([email protected]) |
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* Jaswinder Singh ([email protected]) |
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*/ |
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|
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#include <linux/module.h> |
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#include <sound/core.h> |
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#include <sound/pcm.h> |
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#include <sound/pcm_params.h> |
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#include "u_audio.h" |
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#define BUFF_SIZE_MAX (PAGE_SIZE * 16) |
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#define PRD_SIZE_MAX PAGE_SIZE |
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#define MIN_PERIODS 4 |
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/* Runtime data params for one stream */ |
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struct uac_rtd_params { |
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struct snd_uac_chip *uac; /* parent chip */ |
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bool ep_enabled; /* if the ep is enabled */ |
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struct snd_pcm_substream *ss; |
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/* Ring buffer */ |
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ssize_t hw_ptr; |
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void *rbuf; |
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unsigned int max_psize; /* MaxPacketSize of endpoint */ |
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struct usb_request **reqs; |
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}; |
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struct snd_uac_chip { |
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struct g_audio *audio_dev; |
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struct uac_rtd_params p_prm; |
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struct uac_rtd_params c_prm; |
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struct snd_card *card; |
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struct snd_pcm *pcm; |
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/* timekeeping for the playback endpoint */ |
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unsigned int p_interval; |
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unsigned int p_residue; |
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/* pre-calculated values for playback iso completion */ |
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unsigned int p_pktsize; |
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unsigned int p_pktsize_residue; |
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unsigned int p_framesize; |
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}; |
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static const struct snd_pcm_hardware uac_pcm_hardware = { |
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.info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
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| SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
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| SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME, |
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.rates = SNDRV_PCM_RATE_CONTINUOUS, |
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.periods_max = BUFF_SIZE_MAX / PRD_SIZE_MAX, |
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.buffer_bytes_max = BUFF_SIZE_MAX, |
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.period_bytes_max = PRD_SIZE_MAX, |
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.periods_min = MIN_PERIODS, |
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}; |
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static void u_audio_iso_complete(struct usb_ep *ep, struct usb_request *req) |
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{ |
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unsigned int pending; |
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unsigned int hw_ptr; |
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int status = req->status; |
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struct snd_pcm_substream *substream; |
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struct snd_pcm_runtime *runtime; |
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struct uac_rtd_params *prm = req->context; |
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struct snd_uac_chip *uac = prm->uac; |
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/* i/f shutting down */ |
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if (!prm->ep_enabled) { |
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usb_ep_free_request(ep, req); |
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return; |
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} |
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if (req->status == -ESHUTDOWN) |
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return; |
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/* |
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* We can't really do much about bad xfers. |
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* Afterall, the ISOCH xfers could fail legitimately. |
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*/ |
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if (status) |
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pr_debug("%s: iso_complete status(%d) %d/%d\n", |
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__func__, status, req->actual, req->length); |
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substream = prm->ss; |
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/* Do nothing if ALSA isn't active */ |
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if (!substream) |
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goto exit; |
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snd_pcm_stream_lock(substream); |
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runtime = substream->runtime; |
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if (!runtime || !snd_pcm_running(substream)) { |
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snd_pcm_stream_unlock(substream); |
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goto exit; |
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} |
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
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/* |
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* For each IN packet, take the quotient of the current data |
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* rate and the endpoint's interval as the base packet size. |
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* If there is a residue from this division, add it to the |
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* residue accumulator. |
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*/ |
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req->length = uac->p_pktsize; |
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uac->p_residue += uac->p_pktsize_residue; |
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/* |
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* Whenever there are more bytes in the accumulator than we |
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* need to add one more sample frame, increase this packet's |
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* size and decrease the accumulator. |
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*/ |
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if (uac->p_residue / uac->p_interval >= uac->p_framesize) { |
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req->length += uac->p_framesize; |
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uac->p_residue -= uac->p_framesize * |
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uac->p_interval; |
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} |
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req->actual = req->length; |
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} |
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hw_ptr = prm->hw_ptr; |
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/* Pack USB load in ALSA ring buffer */ |
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pending = runtime->dma_bytes - hw_ptr; |
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
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if (unlikely(pending < req->actual)) { |
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memcpy(req->buf, runtime->dma_area + hw_ptr, pending); |
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memcpy(req->buf + pending, runtime->dma_area, |
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req->actual - pending); |
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} else { |
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memcpy(req->buf, runtime->dma_area + hw_ptr, |
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req->actual); |
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} |
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} else { |
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if (unlikely(pending < req->actual)) { |
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memcpy(runtime->dma_area + hw_ptr, req->buf, pending); |
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memcpy(runtime->dma_area, req->buf + pending, |
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req->actual - pending); |
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} else { |
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memcpy(runtime->dma_area + hw_ptr, req->buf, |
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req->actual); |
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} |
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} |
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/* update hw_ptr after data is copied to memory */ |
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prm->hw_ptr = (hw_ptr + req->actual) % runtime->dma_bytes; |
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hw_ptr = prm->hw_ptr; |
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snd_pcm_stream_unlock(substream); |
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if ((hw_ptr % snd_pcm_lib_period_bytes(substream)) < req->actual) |
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snd_pcm_period_elapsed(substream); |
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exit: |
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if (usb_ep_queue(ep, req, GFP_ATOMIC)) |
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dev_err(uac->card->dev, "%d Error!\n", __LINE__); |
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} |
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static int uac_pcm_trigger(struct snd_pcm_substream *substream, int cmd) |
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{ |
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struct snd_uac_chip *uac = snd_pcm_substream_chip(substream); |
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struct uac_rtd_params *prm; |
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struct g_audio *audio_dev; |
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struct uac_params *params; |
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int err = 0; |
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audio_dev = uac->audio_dev; |
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params = &audio_dev->params; |
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
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prm = &uac->p_prm; |
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else |
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prm = &uac->c_prm; |
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/* Reset */ |
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prm->hw_ptr = 0; |
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switch (cmd) { |
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case SNDRV_PCM_TRIGGER_START: |
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case SNDRV_PCM_TRIGGER_RESUME: |
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prm->ss = substream; |
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break; |
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case SNDRV_PCM_TRIGGER_STOP: |
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case SNDRV_PCM_TRIGGER_SUSPEND: |
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prm->ss = NULL; |
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break; |
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default: |
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err = -EINVAL; |
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} |
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/* Clear buffer after Play stops */ |
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && !prm->ss) |
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memset(prm->rbuf, 0, prm->max_psize * params->req_number); |
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return err; |
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} |
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static snd_pcm_uframes_t uac_pcm_pointer(struct snd_pcm_substream *substream) |
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{ |
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struct snd_uac_chip *uac = snd_pcm_substream_chip(substream); |
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struct uac_rtd_params *prm; |
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
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prm = &uac->p_prm; |
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else |
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prm = &uac->c_prm; |
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return bytes_to_frames(substream->runtime, prm->hw_ptr); |
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} |
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static u64 uac_ssize_to_fmt(int ssize) |
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{ |
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u64 ret; |
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switch (ssize) { |
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case 3: |
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ret = SNDRV_PCM_FMTBIT_S24_3LE; |
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break; |
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case 4: |
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ret = SNDRV_PCM_FMTBIT_S32_LE; |
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break; |
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default: |
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ret = SNDRV_PCM_FMTBIT_S16_LE; |
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break; |
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} |
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return ret; |
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} |
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static int uac_pcm_open(struct snd_pcm_substream *substream) |
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{ |
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struct snd_uac_chip *uac = snd_pcm_substream_chip(substream); |
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struct snd_pcm_runtime *runtime = substream->runtime; |
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struct g_audio *audio_dev; |
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struct uac_params *params; |
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int p_ssize, c_ssize; |
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int p_srate, c_srate; |
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int p_chmask, c_chmask; |
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audio_dev = uac->audio_dev; |
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params = &audio_dev->params; |
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p_ssize = params->p_ssize; |
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c_ssize = params->c_ssize; |
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p_srate = params->p_srate; |
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c_srate = params->c_srate; |
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p_chmask = params->p_chmask; |
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c_chmask = params->c_chmask; |
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uac->p_residue = 0; |
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runtime->hw = uac_pcm_hardware; |
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
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runtime->hw.rate_min = p_srate; |
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runtime->hw.formats = uac_ssize_to_fmt(p_ssize); |
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runtime->hw.channels_min = num_channels(p_chmask); |
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runtime->hw.period_bytes_min = 2 * uac->p_prm.max_psize |
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/ runtime->hw.periods_min; |
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} else { |
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runtime->hw.rate_min = c_srate; |
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runtime->hw.formats = uac_ssize_to_fmt(c_ssize); |
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runtime->hw.channels_min = num_channels(c_chmask); |
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runtime->hw.period_bytes_min = 2 * uac->c_prm.max_psize |
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/ runtime->hw.periods_min; |
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} |
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runtime->hw.rate_max = runtime->hw.rate_min; |
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runtime->hw.channels_max = runtime->hw.channels_min; |
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snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); |
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return 0; |
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} |
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/* ALSA cries without these function pointers */ |
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static int uac_pcm_null(struct snd_pcm_substream *substream) |
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{ |
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return 0; |
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} |
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static const struct snd_pcm_ops uac_pcm_ops = { |
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.open = uac_pcm_open, |
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.close = uac_pcm_null, |
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.trigger = uac_pcm_trigger, |
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.pointer = uac_pcm_pointer, |
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.prepare = uac_pcm_null, |
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}; |
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static inline void free_ep(struct uac_rtd_params *prm, struct usb_ep *ep) |
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{ |
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struct snd_uac_chip *uac = prm->uac; |
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struct g_audio *audio_dev; |
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struct uac_params *params; |
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int i; |
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if (!prm->ep_enabled) |
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return; |
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prm->ep_enabled = false; |
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audio_dev = uac->audio_dev; |
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params = &audio_dev->params; |
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for (i = 0; i < params->req_number; i++) { |
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if (prm->reqs[i]) { |
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if (usb_ep_dequeue(ep, prm->reqs[i])) |
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usb_ep_free_request(ep, prm->reqs[i]); |
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/* |
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* If usb_ep_dequeue() cannot successfully dequeue the |
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* request, the request will be freed by the completion |
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* callback. |
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*/ |
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prm->reqs[i] = NULL; |
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} |
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} |
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if (usb_ep_disable(ep)) |
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dev_err(uac->card->dev, "%s:%d Error!\n", __func__, __LINE__); |
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} |
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int u_audio_start_capture(struct g_audio *audio_dev) |
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{ |
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struct snd_uac_chip *uac = audio_dev->uac; |
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struct usb_gadget *gadget = audio_dev->gadget; |
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struct device *dev = &gadget->dev; |
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struct usb_request *req; |
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struct usb_ep *ep; |
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struct uac_rtd_params *prm; |
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struct uac_params *params = &audio_dev->params; |
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int req_len, i; |
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ep = audio_dev->out_ep; |
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prm = &uac->c_prm; |
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config_ep_by_speed(gadget, &audio_dev->func, ep); |
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req_len = ep->maxpacket; |
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prm->ep_enabled = true; |
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usb_ep_enable(ep); |
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for (i = 0; i < params->req_number; i++) { |
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if (!prm->reqs[i]) { |
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req = usb_ep_alloc_request(ep, GFP_ATOMIC); |
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if (req == NULL) |
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return -ENOMEM; |
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prm->reqs[i] = req; |
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req->zero = 0; |
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req->context = prm; |
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req->length = req_len; |
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req->complete = u_audio_iso_complete; |
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req->buf = prm->rbuf + i * ep->maxpacket; |
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} |
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if (usb_ep_queue(ep, prm->reqs[i], GFP_ATOMIC)) |
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dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); |
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} |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(u_audio_start_capture); |
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void u_audio_stop_capture(struct g_audio *audio_dev) |
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{ |
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struct snd_uac_chip *uac = audio_dev->uac; |
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free_ep(&uac->c_prm, audio_dev->out_ep); |
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} |
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EXPORT_SYMBOL_GPL(u_audio_stop_capture); |
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int u_audio_start_playback(struct g_audio *audio_dev) |
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{ |
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struct snd_uac_chip *uac = audio_dev->uac; |
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struct usb_gadget *gadget = audio_dev->gadget; |
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struct device *dev = &gadget->dev; |
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struct usb_request *req; |
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struct usb_ep *ep; |
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struct uac_rtd_params *prm; |
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struct uac_params *params = &audio_dev->params; |
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unsigned int factor; |
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const struct usb_endpoint_descriptor *ep_desc; |
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int req_len, i; |
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ep = audio_dev->in_ep; |
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prm = &uac->p_prm; |
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config_ep_by_speed(gadget, &audio_dev->func, ep); |
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ep_desc = ep->desc; |
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/* pre-calculate the playback endpoint's interval */ |
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if (gadget->speed == USB_SPEED_FULL) |
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factor = 1000; |
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else |
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factor = 8000; |
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/* pre-compute some values for iso_complete() */ |
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uac->p_framesize = params->p_ssize * |
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num_channels(params->p_chmask); |
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uac->p_interval = factor / (1 << (ep_desc->bInterval - 1)); |
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uac->p_pktsize = min_t(unsigned int, |
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uac->p_framesize * |
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(params->p_srate / uac->p_interval), |
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ep->maxpacket); |
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if (uac->p_pktsize < ep->maxpacket) |
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uac->p_pktsize_residue = uac->p_framesize * |
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(params->p_srate % uac->p_interval); |
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else |
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uac->p_pktsize_residue = 0; |
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req_len = uac->p_pktsize; |
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uac->p_residue = 0; |
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prm->ep_enabled = true; |
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usb_ep_enable(ep); |
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for (i = 0; i < params->req_number; i++) { |
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if (!prm->reqs[i]) { |
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req = usb_ep_alloc_request(ep, GFP_ATOMIC); |
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if (req == NULL) |
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return -ENOMEM; |
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prm->reqs[i] = req; |
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req->zero = 0; |
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req->context = prm; |
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req->length = req_len; |
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req->complete = u_audio_iso_complete; |
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req->buf = prm->rbuf + i * ep->maxpacket; |
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} |
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if (usb_ep_queue(ep, prm->reqs[i], GFP_ATOMIC)) |
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dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); |
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} |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(u_audio_start_playback); |
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void u_audio_stop_playback(struct g_audio *audio_dev) |
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{ |
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struct snd_uac_chip *uac = audio_dev->uac; |
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free_ep(&uac->p_prm, audio_dev->in_ep); |
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} |
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EXPORT_SYMBOL_GPL(u_audio_stop_playback); |
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int g_audio_setup(struct g_audio *g_audio, const char *pcm_name, |
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const char *card_name) |
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{ |
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struct snd_uac_chip *uac; |
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struct snd_card *card; |
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struct snd_pcm *pcm; |
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struct uac_params *params; |
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int p_chmask, c_chmask; |
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int err; |
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if (!g_audio) |
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return -EINVAL; |
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uac = kzalloc(sizeof(*uac), GFP_KERNEL); |
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if (!uac) |
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return -ENOMEM; |
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g_audio->uac = uac; |
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uac->audio_dev = g_audio; |
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params = &g_audio->params; |
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p_chmask = params->p_chmask; |
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c_chmask = params->c_chmask; |
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if (c_chmask) { |
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struct uac_rtd_params *prm = &uac->c_prm; |
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uac->c_prm.uac = uac; |
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prm->max_psize = g_audio->out_ep_maxpsize; |
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|
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prm->reqs = kcalloc(params->req_number, |
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sizeof(struct usb_request *), |
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GFP_KERNEL); |
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if (!prm->reqs) { |
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err = -ENOMEM; |
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goto fail; |
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} |
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prm->rbuf = kcalloc(params->req_number, prm->max_psize, |
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GFP_KERNEL); |
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if (!prm->rbuf) { |
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prm->max_psize = 0; |
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err = -ENOMEM; |
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goto fail; |
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} |
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} |
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|
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if (p_chmask) { |
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struct uac_rtd_params *prm = &uac->p_prm; |
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|
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uac->p_prm.uac = uac; |
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prm->max_psize = g_audio->in_ep_maxpsize; |
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|
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prm->reqs = kcalloc(params->req_number, |
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sizeof(struct usb_request *), |
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GFP_KERNEL); |
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if (!prm->reqs) { |
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err = -ENOMEM; |
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goto fail; |
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} |
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prm->rbuf = kcalloc(params->req_number, prm->max_psize, |
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GFP_KERNEL); |
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if (!prm->rbuf) { |
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prm->max_psize = 0; |
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err = -ENOMEM; |
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goto fail; |
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} |
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} |
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|
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/* Choose any slot, with no id */ |
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err = snd_card_new(&g_audio->gadget->dev, |
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-1, NULL, THIS_MODULE, 0, &card); |
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if (err < 0) |
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goto fail; |
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uac->card = card; |
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|
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/* |
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* Create first PCM device |
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* Create a substream only for non-zero channel streams |
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*/ |
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err = snd_pcm_new(uac->card, pcm_name, 0, |
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p_chmask ? 1 : 0, c_chmask ? 1 : 0, &pcm); |
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if (err < 0) |
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goto snd_fail; |
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|
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strlcpy(pcm->name, pcm_name, sizeof(pcm->name)); |
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pcm->private_data = uac; |
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uac->pcm = pcm; |
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|
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snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &uac_pcm_ops); |
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snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &uac_pcm_ops); |
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|
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strlcpy(card->driver, card_name, sizeof(card->driver)); |
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strlcpy(card->shortname, card_name, sizeof(card->shortname)); |
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sprintf(card->longname, "%s %i", card_name, card->dev->id); |
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|
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snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS, |
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NULL, 0, BUFF_SIZE_MAX); |
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|
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err = snd_card_register(card); |
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|
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if (!err) |
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return 0; |
|
|
|
snd_fail: |
|
snd_card_free(card); |
|
fail: |
|
kfree(uac->p_prm.reqs); |
|
kfree(uac->c_prm.reqs); |
|
kfree(uac->p_prm.rbuf); |
|
kfree(uac->c_prm.rbuf); |
|
kfree(uac); |
|
|
|
return err; |
|
} |
|
EXPORT_SYMBOL_GPL(g_audio_setup); |
|
|
|
void g_audio_cleanup(struct g_audio *g_audio) |
|
{ |
|
struct snd_uac_chip *uac; |
|
struct snd_card *card; |
|
|
|
if (!g_audio || !g_audio->uac) |
|
return; |
|
|
|
uac = g_audio->uac; |
|
card = uac->card; |
|
if (card) |
|
snd_card_free(card); |
|
|
|
kfree(uac->p_prm.reqs); |
|
kfree(uac->c_prm.reqs); |
|
kfree(uac->p_prm.rbuf); |
|
kfree(uac->c_prm.rbuf); |
|
kfree(uac); |
|
} |
|
EXPORT_SYMBOL_GPL(g_audio_cleanup); |
|
|
|
MODULE_LICENSE("GPL"); |
|
MODULE_DESCRIPTION("USB gadget \"ALSA sound card\" utilities"); |
|
MODULE_AUTHOR("Ruslan Bilovol");
|
|
|