2017-06-18 21:23:52 +08:00
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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 <ruslan.bilovol@gmail.com>
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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 (yadi.brar01@gmail.com)
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* Jaswinder Singh (jaswinder.singh@linaro.org)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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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struct uac_req {
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struct uac_rtd_params *pp; /* parent param */
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struct usb_request *req;
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};
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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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/* Size of the ring buffer */
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size_t dma_bytes;
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unsigned char *dma_area;
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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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size_t period_size;
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unsigned max_psize; /* MaxPacketSize of endpoint */
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struct uac_req *ureq;
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spinlock_t lock;
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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 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 pending;
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unsigned long flags;
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unsigned int hw_ptr;
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bool update_alsa = false;
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int status = req->status;
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struct uac_req *ur = req->context;
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struct snd_pcm_substream *substream;
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struct uac_rtd_params *prm = ur->pp;
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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 || 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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spin_lock_irqsave(&prm->lock, flags);
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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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pending = prm->hw_ptr % prm->period_size;
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pending += req->actual;
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if (pending >= prm->period_size)
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update_alsa = true;
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hw_ptr = prm->hw_ptr;
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prm->hw_ptr = (prm->hw_ptr + req->actual) % prm->dma_bytes;
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spin_unlock_irqrestore(&prm->lock, flags);
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/* Pack USB load in ALSA ring buffer */
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pending = prm->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, prm->dma_area + hw_ptr, pending);
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memcpy(req->buf + pending, prm->dma_area,
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req->actual - pending);
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} else {
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memcpy(req->buf, prm->dma_area + hw_ptr, 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(prm->dma_area + hw_ptr, req->buf, pending);
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memcpy(prm->dma_area, req->buf + pending,
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req->actual - pending);
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} else {
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memcpy(prm->dma_area + hw_ptr, req->buf, req->actual);
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}
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}
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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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if (update_alsa)
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snd_pcm_period_elapsed(substream);
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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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unsigned long flags;
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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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spin_lock_irqsave(&prm->lock, flags);
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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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spin_unlock_irqrestore(&prm->lock, flags);
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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 int uac_pcm_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *hw_params)
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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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int err;
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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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err = snd_pcm_lib_malloc_pages(substream,
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params_buffer_bytes(hw_params));
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if (err >= 0) {
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prm->dma_bytes = substream->runtime->dma_bytes;
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prm->dma_area = substream->runtime->dma_area;
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prm->period_size = params_period_bytes(hw_params);
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}
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return err;
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}
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static int uac_pcm_hw_free(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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prm->dma_area = NULL;
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prm->dma_bytes = 0;
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prm->period_size = 0;
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return snd_pcm_lib_free_pages(substream);
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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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spin_lock_init(&uac->p_prm.lock);
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runtime->hw.rate_min = p_srate;
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switch (p_ssize) {
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case 3:
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runtime->hw.formats = SNDRV_PCM_FMTBIT_S24_3LE;
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break;
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case 4:
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runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE;
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break;
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default:
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runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE;
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break;
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}
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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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spin_lock_init(&uac->c_prm.lock);
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runtime->hw.rate_min = c_srate;
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switch (c_ssize) {
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case 3:
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runtime->hw.formats = SNDRV_PCM_FMTBIT_S24_3LE;
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break;
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case 4:
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runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE;
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break;
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default:
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runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE;
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break;
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}
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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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2017-08-09 15:46:51 +08:00
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static const struct snd_pcm_ops uac_pcm_ops = {
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2017-06-18 21:23:52 +08:00
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.open = uac_pcm_open,
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.close = uac_pcm_null,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = uac_pcm_hw_params,
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.hw_free = uac_pcm_hw_free,
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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->ureq[i].req) {
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usb_ep_dequeue(ep, prm->ureq[i].req);
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usb_ep_free_request(ep, prm->ureq[i].req);
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prm->ureq[i].req = 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 = prm->max_psize;
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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->ureq[i].req) {
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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->ureq[i].req = req;
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prm->ureq[i].pp = prm;
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req->zero = 0;
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req->context = &prm->ureq[i];
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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 * prm->max_psize;
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}
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if (usb_ep_queue(ep, prm->ureq[i].req, 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, rate;
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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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rate = params->p_srate * uac->p_framesize;
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uac->p_interval = factor / (1 << (ep_desc->bInterval - 1));
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uac->p_pktsize = min_t(unsigned int, rate / uac->p_interval,
|
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prm->max_psize);
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if (uac->p_pktsize < prm->max_psize)
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uac->p_pktsize_residue = rate % 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->ureq[i].req) {
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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->ureq[i].req = req;
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|
prm->ureq[i].pp = prm;
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req->zero = 0;
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|
req->context = &prm->ureq[i];
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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 * prm->max_psize;
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}
|
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|
|
if (usb_ep_queue(ep, prm->ureq[i].req, GFP_ATOMIC))
|
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|
|
dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
|
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|
|
}
|
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|
|
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|
|
|
return 0;
|
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|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(u_audio_start_playback);
|
|
|
|
|
|
|
|
void u_audio_stop_playback(struct g_audio *audio_dev)
|
|
|
|
{
|
|
|
|
struct snd_uac_chip *uac = audio_dev->uac;
|
|
|
|
|
|
|
|
free_ep(&uac->p_prm, audio_dev->in_ep);
|
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|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(u_audio_stop_playback);
|
|
|
|
|
|
|
|
int g_audio_setup(struct g_audio *g_audio, const char *pcm_name,
|
|
|
|
const char *card_name)
|
|
|
|
{
|
|
|
|
struct snd_uac_chip *uac;
|
|
|
|
struct snd_card *card;
|
|
|
|
struct snd_pcm *pcm;
|
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|
|
struct uac_params *params;
|
|
|
|
int p_chmask, c_chmask;
|
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|
|
int err;
|
|
|
|
|
|
|
|
if (!g_audio)
|
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|
|
return -EINVAL;
|
|
|
|
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|
|
uac = kzalloc(sizeof(*uac), GFP_KERNEL);
|
|
|
|
if (!uac)
|
|
|
|
return -ENOMEM;
|
|
|
|
g_audio->uac = uac;
|
|
|
|
uac->audio_dev = g_audio;
|
|
|
|
|
|
|
|
params = &g_audio->params;
|
|
|
|
p_chmask = params->p_chmask;
|
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|
|
c_chmask = params->c_chmask;
|
|
|
|
|
|
|
|
if (c_chmask) {
|
|
|
|
struct uac_rtd_params *prm = &uac->c_prm;
|
|
|
|
|
|
|
|
uac->c_prm.uac = uac;
|
|
|
|
prm->max_psize = g_audio->out_ep_maxpsize;
|
|
|
|
|
|
|
|
prm->ureq = kcalloc(params->req_number, sizeof(struct uac_req),
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (!prm->ureq) {
|
|
|
|
err = -ENOMEM;
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
|
|
|
prm->rbuf = kcalloc(params->req_number, prm->max_psize,
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (!prm->rbuf) {
|
|
|
|
prm->max_psize = 0;
|
|
|
|
err = -ENOMEM;
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (p_chmask) {
|
|
|
|
struct uac_rtd_params *prm = &uac->p_prm;
|
|
|
|
|
|
|
|
uac->p_prm.uac = uac;
|
|
|
|
prm->max_psize = g_audio->in_ep_maxpsize;
|
|
|
|
|
|
|
|
prm->ureq = kcalloc(params->req_number, sizeof(struct uac_req),
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (!prm->ureq) {
|
|
|
|
err = -ENOMEM;
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
|
|
|
prm->rbuf = kcalloc(params->req_number, prm->max_psize,
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (!prm->rbuf) {
|
|
|
|
prm->max_psize = 0;
|
|
|
|
err = -ENOMEM;
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Choose any slot, with no id */
|
|
|
|
err = snd_card_new(&g_audio->gadget->dev,
|
|
|
|
-1, NULL, THIS_MODULE, 0, &card);
|
|
|
|
if (err < 0)
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
uac->card = card;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Create first PCM device
|
|
|
|
* Create a substream only for non-zero channel streams
|
|
|
|
*/
|
|
|
|
err = snd_pcm_new(uac->card, pcm_name, 0,
|
|
|
|
p_chmask ? 1 : 0, c_chmask ? 1 : 0, &pcm);
|
|
|
|
if (err < 0)
|
|
|
|
goto snd_fail;
|
|
|
|
|
|
|
|
strcpy(pcm->name, pcm_name);
|
|
|
|
pcm->private_data = uac;
|
|
|
|
uac->pcm = pcm;
|
|
|
|
|
|
|
|
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &uac_pcm_ops);
|
|
|
|
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &uac_pcm_ops);
|
|
|
|
|
|
|
|
strcpy(card->driver, card_name);
|
|
|
|
strcpy(card->shortname, card_name);
|
|
|
|
sprintf(card->longname, "%s %i", card_name, card->dev->id);
|
|
|
|
|
|
|
|
snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
|
|
|
|
snd_dma_continuous_data(GFP_KERNEL), 0, BUFF_SIZE_MAX);
|
|
|
|
|
|
|
|
err = snd_card_register(card);
|
|
|
|
|
|
|
|
if (!err)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
snd_fail:
|
|
|
|
snd_card_free(card);
|
|
|
|
fail:
|
|
|
|
kfree(uac->p_prm.ureq);
|
|
|
|
kfree(uac->c_prm.ureq);
|
|
|
|
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.ureq);
|
|
|
|
kfree(uac->c_prm.ureq);
|
|
|
|
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");
|