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path: root/drivers/usb/gadget/function/u_uac1.c
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Diffstat (limited to 'drivers/usb/gadget/function/u_uac1.c')
-rw-r--r--drivers/usb/gadget/function/u_uac1.c314
1 files changed, 0 insertions, 314 deletions
diff --git a/drivers/usb/gadget/function/u_uac1.c b/drivers/usb/gadget/function/u_uac1.c
deleted file mode 100644
index c78c84138a28..000000000000
--- a/drivers/usb/gadget/function/u_uac1.c
+++ /dev/null
@@ -1,314 +0,0 @@
-/*
- * u_uac1.c -- ALSA audio utilities for Gadget stack
- *
- * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
- * Copyright (C) 2008 Analog Devices, Inc
- *
- * Enter bugs at http://blackfin.uclinux.org/
- *
- * Licensed under the GPL-2 or later.
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/device.h>
-#include <linux/delay.h>
-#include <linux/ctype.h>
-#include <linux/random.h>
-#include <linux/syscalls.h>
-
-#include "u_uac1.h"
-
-/*
- * This component encapsulates the ALSA devices for USB audio gadget
- */
-
-/*-------------------------------------------------------------------------*/
-
-/**
- * Some ALSA internal helper functions
- */
-static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
-{
- struct snd_interval t;
- t.empty = 0;
- t.min = t.max = val;
- t.openmin = t.openmax = 0;
- t.integer = 1;
- return snd_interval_refine(i, &t);
-}
-
-static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
- snd_pcm_hw_param_t var, unsigned int val,
- int dir)
-{
- int changed;
- if (hw_is_mask(var)) {
- struct snd_mask *m = hw_param_mask(params, var);
- if (val == 0 && dir < 0) {
- changed = -EINVAL;
- snd_mask_none(m);
- } else {
- if (dir > 0)
- val++;
- else if (dir < 0)
- val--;
- changed = snd_mask_refine_set(
- hw_param_mask(params, var), val);
- }
- } else if (hw_is_interval(var)) {
- struct snd_interval *i = hw_param_interval(params, var);
- if (val == 0 && dir < 0) {
- changed = -EINVAL;
- snd_interval_none(i);
- } else if (dir == 0)
- changed = snd_interval_refine_set(i, val);
- else {
- struct snd_interval t;
- t.openmin = 1;
- t.openmax = 1;
- t.empty = 0;
- t.integer = 0;
- if (dir < 0) {
- t.min = val - 1;
- t.max = val;
- } else {
- t.min = val;
- t.max = val+1;
- }
- changed = snd_interval_refine(i, &t);
- }
- } else
- return -EINVAL;
- if (changed) {
- params->cmask |= 1 << var;
- params->rmask |= 1 << var;
- }
- return changed;
-}
-/*-------------------------------------------------------------------------*/
-
-/**
- * Set default hardware params
- */
-static int playback_default_hw_params(struct gaudio_snd_dev *snd)
-{
- struct snd_pcm_substream *substream = snd->substream;
- struct snd_pcm_hw_params *params;
- snd_pcm_sframes_t result;
-
- /*
- * SNDRV_PCM_ACCESS_RW_INTERLEAVED,
- * SNDRV_PCM_FORMAT_S16_LE
- * CHANNELS: 2
- * RATE: 48000
- */
- snd->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
- snd->format = SNDRV_PCM_FORMAT_S16_LE;
- snd->channels = 2;
- snd->rate = 48000;
-
- params = kzalloc(sizeof(*params), GFP_KERNEL);
- if (!params)
- return -ENOMEM;
-
- _snd_pcm_hw_params_any(params);
- _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
- snd->access, 0);
- _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
- snd->format, 0);
- _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
- snd->channels, 0);
- _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
- snd->rate, 0);
-
- snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
- snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, params);
-
- result = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
- if (result < 0) {
- ERROR(snd->card,
- "Preparing sound card failed: %d\n", (int)result);
- kfree(params);
- return result;
- }
-
- /* Store the hardware parameters */
- snd->access = params_access(params);
- snd->format = params_format(params);
- snd->channels = params_channels(params);
- snd->rate = params_rate(params);
-
- kfree(params);
-
- INFO(snd->card,
- "Hardware params: access %x, format %x, channels %d, rate %d\n",
- snd->access, snd->format, snd->channels, snd->rate);
-
- return 0;
-}
-
-/**
- * Playback audio buffer data by ALSA PCM device
- */
-size_t u_audio_playback(struct gaudio *card, void *buf, size_t count)
-{
- struct gaudio_snd_dev *snd = &card->playback;
- struct snd_pcm_substream *substream = snd->substream;
- struct snd_pcm_runtime *runtime = substream->runtime;
- mm_segment_t old_fs;
- ssize_t result;
- snd_pcm_sframes_t frames;
-
-try_again:
- if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
- runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
- result = snd_pcm_kernel_ioctl(substream,
- SNDRV_PCM_IOCTL_PREPARE, NULL);
- if (result < 0) {
- ERROR(card, "Preparing sound card failed: %d\n",
- (int)result);
- return result;
- }
- }
-
- frames = bytes_to_frames(runtime, count);
- old_fs = get_fs();
- set_fs(KERNEL_DS);
- result = snd_pcm_lib_write(snd->substream, (void __user *)buf, frames);
- if (result != frames) {
- ERROR(card, "Playback error: %d\n", (int)result);
- set_fs(old_fs);
- goto try_again;
- }
- set_fs(old_fs);
-
- return 0;
-}
-
-int u_audio_get_playback_channels(struct gaudio *card)
-{
- return card->playback.channels;
-}
-
-int u_audio_get_playback_rate(struct gaudio *card)
-{
- return card->playback.rate;
-}
-
-/**
- * Open ALSA PCM and control device files
- * Initial the PCM or control device
- */
-static int gaudio_open_snd_dev(struct gaudio *card)
-{
- struct snd_pcm_file *pcm_file;
- struct gaudio_snd_dev *snd;
- struct f_uac1_opts *opts;
- char *fn_play, *fn_cap, *fn_cntl;
-
- opts = container_of(card->func.fi, struct f_uac1_opts, func_inst);
- fn_play = opts->fn_play;
- fn_cap = opts->fn_cap;
- fn_cntl = opts->fn_cntl;
-
- /* Open control device */
- snd = &card->control;
- snd->filp = filp_open(fn_cntl, O_RDWR, 0);
- if (IS_ERR(snd->filp)) {
- int ret = PTR_ERR(snd->filp);
- ERROR(card, "unable to open sound control device file: %s\n",
- fn_cntl);
- snd->filp = NULL;
- return ret;
- }
- snd->card = card;
-
- /* Open PCM playback device and setup substream */
- snd = &card->playback;
- snd->filp = filp_open(fn_play, O_WRONLY, 0);
- if (IS_ERR(snd->filp)) {
- int ret = PTR_ERR(snd->filp);
-
- ERROR(card, "No such PCM playback device: %s\n", fn_play);
- snd->filp = NULL;
- return ret;
- }
- pcm_file = snd->filp->private_data;
- snd->substream = pcm_file->substream;
- snd->card = card;
- playback_default_hw_params(snd);
-
- /* Open PCM capture device and setup substream */
- snd = &card->capture;
- snd->filp = filp_open(fn_cap, O_RDONLY, 0);
- if (IS_ERR(snd->filp)) {
- ERROR(card, "No such PCM capture device: %s\n", fn_cap);
- snd->substream = NULL;
- snd->card = NULL;
- snd->filp = NULL;
- } else {
- pcm_file = snd->filp->private_data;
- snd->substream = pcm_file->substream;
- snd->card = card;
- }
-
- return 0;
-}
-
-/**
- * Close ALSA PCM and control device files
- */
-static int gaudio_close_snd_dev(struct gaudio *gau)
-{
- struct gaudio_snd_dev *snd;
-
- /* Close control device */
- snd = &gau->control;
- if (snd->filp)
- filp_close(snd->filp, NULL);
-
- /* Close PCM playback device and setup substream */
- snd = &gau->playback;
- if (snd->filp)
- filp_close(snd->filp, NULL);
-
- /* Close PCM capture device and setup substream */
- snd = &gau->capture;
- if (snd->filp)
- filp_close(snd->filp, NULL);
-
- return 0;
-}
-
-/**
- * gaudio_setup - setup ALSA interface and preparing for USB transfer
- *
- * This sets up PCM, mixer or MIDI ALSA devices fore USB gadget using.
- *
- * Returns negative errno, or zero on success
- */
-int gaudio_setup(struct gaudio *card)
-{
- int ret;
-
- ret = gaudio_open_snd_dev(card);
- if (ret)
- ERROR(card, "we need at least one control device\n");
-
- return ret;
-
-}
-
-/**
- * gaudio_cleanup - remove ALSA device interface
- *
- * This is called to free all resources allocated by @gaudio_setup().
- */
-void gaudio_cleanup(struct gaudio *the_card)
-{
- if (the_card)
- gaudio_close_snd_dev(the_card);
-}
-
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