linux/sound/drivers/dummy.c
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:35 -07:00

1208 lines
31 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Dummy soundcard
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
*/
#include <linux/init.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/jiffies.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/wait.h>
#include <linux/hrtimer.h>
#include <linux/math64.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/tlv.h>
#include <sound/pcm.h>
#include <sound/rawmidi.h>
#include <sound/info.h>
#include <sound/initval.h>
MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("Dummy soundcard (/dev/null)");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{ALSA,Dummy soundcard}}");
#define MAX_PCM_DEVICES 4
#define MAX_PCM_SUBSTREAMS 128
#define MAX_MIDI_DEVICES 2
/* defaults */
#define MAX_BUFFER_SIZE (64*1024)
#define MIN_PERIOD_SIZE 64
#define MAX_PERIOD_SIZE MAX_BUFFER_SIZE
#define USE_FORMATS (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
#define USE_RATE SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000
#define USE_RATE_MIN 5500
#define USE_RATE_MAX 48000
#define USE_CHANNELS_MIN 1
#define USE_CHANNELS_MAX 2
#define USE_PERIODS_MIN 1
#define USE_PERIODS_MAX 1024
static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
static char *model[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = NULL};
static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
//static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
#ifdef CONFIG_HIGH_RES_TIMERS
static bool hrtimer = 1;
#endif
static bool fake_buffer = 1;
module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
module_param_array(model, charp, NULL, 0444);
MODULE_PARM_DESC(model, "Soundcard model.");
module_param_array(pcm_devs, int, NULL, 0444);
MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
module_param_array(pcm_substreams, int, NULL, 0444);
MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-128) for dummy driver.");
//module_param_array(midi_devs, int, NULL, 0444);
//MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
module_param(fake_buffer, bool, 0444);
MODULE_PARM_DESC(fake_buffer, "Fake buffer allocations.");
#ifdef CONFIG_HIGH_RES_TIMERS
module_param(hrtimer, bool, 0644);
MODULE_PARM_DESC(hrtimer, "Use hrtimer as the timer source.");
#endif
static struct platform_device *devices[SNDRV_CARDS];
#define MIXER_ADDR_MASTER 0
#define MIXER_ADDR_LINE 1
#define MIXER_ADDR_MIC 2
#define MIXER_ADDR_SYNTH 3
#define MIXER_ADDR_CD 4
#define MIXER_ADDR_LAST 4
struct dummy_timer_ops {
int (*create)(struct snd_pcm_substream *);
void (*free)(struct snd_pcm_substream *);
int (*prepare)(struct snd_pcm_substream *);
int (*start)(struct snd_pcm_substream *);
int (*stop)(struct snd_pcm_substream *);
snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *);
};
#define get_dummy_ops(substream) \
(*(const struct dummy_timer_ops **)(substream)->runtime->private_data)
struct dummy_model {
const char *name;
int (*playback_constraints)(struct snd_pcm_runtime *runtime);
int (*capture_constraints)(struct snd_pcm_runtime *runtime);
u64 formats;
size_t buffer_bytes_max;
size_t period_bytes_min;
size_t period_bytes_max;
unsigned int periods_min;
unsigned int periods_max;
unsigned int rates;
unsigned int rate_min;
unsigned int rate_max;
unsigned int channels_min;
unsigned int channels_max;
};
struct snd_dummy {
struct snd_card *card;
struct dummy_model *model;
struct snd_pcm *pcm;
struct snd_pcm_hardware pcm_hw;
spinlock_t mixer_lock;
int mixer_volume[MIXER_ADDR_LAST+1][2];
int capture_source[MIXER_ADDR_LAST+1][2];
int iobox;
struct snd_kcontrol *cd_volume_ctl;
struct snd_kcontrol *cd_switch_ctl;
};
/*
* card models
*/
static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
{
int err;
err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
if (err < 0)
return err;
err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX);
if (err < 0)
return err;
return 0;
}
static struct dummy_model model_emu10k1 = {
.name = "emu10k1",
.playback_constraints = emu10k1_playback_constraints,
.buffer_bytes_max = 128 * 1024,
};
static struct dummy_model model_rme9652 = {
.name = "rme9652",
.buffer_bytes_max = 26 * 64 * 1024,
.formats = SNDRV_PCM_FMTBIT_S32_LE,
.channels_min = 26,
.channels_max = 26,
.periods_min = 2,
.periods_max = 2,
};
static struct dummy_model model_ice1712 = {
.name = "ice1712",
.buffer_bytes_max = 256 * 1024,
.formats = SNDRV_PCM_FMTBIT_S32_LE,
.channels_min = 10,
.channels_max = 10,
.periods_min = 1,
.periods_max = 1024,
};
static struct dummy_model model_uda1341 = {
.name = "uda1341",
.buffer_bytes_max = 16380,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
.channels_min = 2,
.channels_max = 2,
.periods_min = 2,
.periods_max = 255,
};
static struct dummy_model model_ac97 = {
.name = "ac97",
.formats = SNDRV_PCM_FMTBIT_S16_LE,
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_48000,
.rate_min = 48000,
.rate_max = 48000,
};
static struct dummy_model model_ca0106 = {
.name = "ca0106",
.formats = SNDRV_PCM_FMTBIT_S16_LE,
.buffer_bytes_max = ((65536-64)*8),
.period_bytes_max = (65536-64),
.periods_min = 2,
.periods_max = 8,
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000,
.rate_min = 48000,
.rate_max = 192000,
};
static struct dummy_model *dummy_models[] = {
&model_emu10k1,
&model_rme9652,
&model_ice1712,
&model_uda1341,
&model_ac97,
&model_ca0106,
NULL
};
/*
* system timer interface
*/
struct dummy_systimer_pcm {
/* ops must be the first item */
const struct dummy_timer_ops *timer_ops;
spinlock_t lock;
struct timer_list timer;
unsigned long base_time;
unsigned int frac_pos; /* fractional sample position (based HZ) */
unsigned int frac_period_rest;
unsigned int frac_buffer_size; /* buffer_size * HZ */
unsigned int frac_period_size; /* period_size * HZ */
unsigned int rate;
int elapsed;
struct snd_pcm_substream *substream;
};
static void dummy_systimer_rearm(struct dummy_systimer_pcm *dpcm)
{
mod_timer(&dpcm->timer, jiffies +
(dpcm->frac_period_rest + dpcm->rate - 1) / dpcm->rate);
}
static void dummy_systimer_update(struct dummy_systimer_pcm *dpcm)
{
unsigned long delta;
delta = jiffies - dpcm->base_time;
if (!delta)
return;
dpcm->base_time += delta;
delta *= dpcm->rate;
dpcm->frac_pos += delta;
while (dpcm->frac_pos >= dpcm->frac_buffer_size)
dpcm->frac_pos -= dpcm->frac_buffer_size;
while (dpcm->frac_period_rest <= delta) {
dpcm->elapsed++;
dpcm->frac_period_rest += dpcm->frac_period_size;
}
dpcm->frac_period_rest -= delta;
}
static int dummy_systimer_start(struct snd_pcm_substream *substream)
{
struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
spin_lock(&dpcm->lock);
dpcm->base_time = jiffies;
dummy_systimer_rearm(dpcm);
spin_unlock(&dpcm->lock);
return 0;
}
static int dummy_systimer_stop(struct snd_pcm_substream *substream)
{
struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
spin_lock(&dpcm->lock);
del_timer(&dpcm->timer);
spin_unlock(&dpcm->lock);
return 0;
}
static int dummy_systimer_prepare(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct dummy_systimer_pcm *dpcm = runtime->private_data;
dpcm->frac_pos = 0;
dpcm->rate = runtime->rate;
dpcm->frac_buffer_size = runtime->buffer_size * HZ;
dpcm->frac_period_size = runtime->period_size * HZ;
dpcm->frac_period_rest = dpcm->frac_period_size;
dpcm->elapsed = 0;
return 0;
}
static void dummy_systimer_callback(struct timer_list *t)
{
struct dummy_systimer_pcm *dpcm = from_timer(dpcm, t, timer);
unsigned long flags;
int elapsed = 0;
spin_lock_irqsave(&dpcm->lock, flags);
dummy_systimer_update(dpcm);
dummy_systimer_rearm(dpcm);
elapsed = dpcm->elapsed;
dpcm->elapsed = 0;
spin_unlock_irqrestore(&dpcm->lock, flags);
if (elapsed)
snd_pcm_period_elapsed(dpcm->substream);
}
static snd_pcm_uframes_t
dummy_systimer_pointer(struct snd_pcm_substream *substream)
{
struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
snd_pcm_uframes_t pos;
spin_lock(&dpcm->lock);
dummy_systimer_update(dpcm);
pos = dpcm->frac_pos / HZ;
spin_unlock(&dpcm->lock);
return pos;
}
static int dummy_systimer_create(struct snd_pcm_substream *substream)
{
struct dummy_systimer_pcm *dpcm;
dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
if (!dpcm)
return -ENOMEM;
substream->runtime->private_data = dpcm;
timer_setup(&dpcm->timer, dummy_systimer_callback, 0);
spin_lock_init(&dpcm->lock);
dpcm->substream = substream;
return 0;
}
static void dummy_systimer_free(struct snd_pcm_substream *substream)
{
kfree(substream->runtime->private_data);
}
static const struct dummy_timer_ops dummy_systimer_ops = {
.create = dummy_systimer_create,
.free = dummy_systimer_free,
.prepare = dummy_systimer_prepare,
.start = dummy_systimer_start,
.stop = dummy_systimer_stop,
.pointer = dummy_systimer_pointer,
};
#ifdef CONFIG_HIGH_RES_TIMERS
/*
* hrtimer interface
*/
struct dummy_hrtimer_pcm {
/* ops must be the first item */
const struct dummy_timer_ops *timer_ops;
ktime_t base_time;
ktime_t period_time;
atomic_t running;
struct hrtimer timer;
struct snd_pcm_substream *substream;
};
static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
{
struct dummy_hrtimer_pcm *dpcm;
dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
if (!atomic_read(&dpcm->running))
return HRTIMER_NORESTART;
/*
* In cases of XRUN and draining, this calls .trigger to stop PCM
* substream.
*/
snd_pcm_period_elapsed(dpcm->substream);
if (!atomic_read(&dpcm->running))
return HRTIMER_NORESTART;
hrtimer_forward_now(timer, dpcm->period_time);
return HRTIMER_RESTART;
}
static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
{
struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL_SOFT);
atomic_set(&dpcm->running, 1);
return 0;
}
static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
{
struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
atomic_set(&dpcm->running, 0);
if (!hrtimer_callback_running(&dpcm->timer))
hrtimer_cancel(&dpcm->timer);
return 0;
}
static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
{
hrtimer_cancel(&dpcm->timer);
}
static snd_pcm_uframes_t
dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
u64 delta;
u32 pos;
delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
dpcm->base_time);
delta = div_u64(delta * runtime->rate + 999999, 1000000);
div_u64_rem(delta, runtime->buffer_size, &pos);
return pos;
}
static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
unsigned int period, rate;
long sec;
unsigned long nsecs;
dummy_hrtimer_sync(dpcm);
period = runtime->period_size;
rate = runtime->rate;
sec = period / rate;
period %= rate;
nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
dpcm->period_time = ktime_set(sec, nsecs);
return 0;
}
static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
{
struct dummy_hrtimer_pcm *dpcm;
dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
if (!dpcm)
return -ENOMEM;
substream->runtime->private_data = dpcm;
hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT);
dpcm->timer.function = dummy_hrtimer_callback;
dpcm->substream = substream;
atomic_set(&dpcm->running, 0);
return 0;
}
static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
{
struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
dummy_hrtimer_sync(dpcm);
kfree(dpcm);
}
static const struct dummy_timer_ops dummy_hrtimer_ops = {
.create = dummy_hrtimer_create,
.free = dummy_hrtimer_free,
.prepare = dummy_hrtimer_prepare,
.start = dummy_hrtimer_start,
.stop = dummy_hrtimer_stop,
.pointer = dummy_hrtimer_pointer,
};
#endif /* CONFIG_HIGH_RES_TIMERS */
/*
* PCM interface
*/
static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
return get_dummy_ops(substream)->start(substream);
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
return get_dummy_ops(substream)->stop(substream);
}
return -EINVAL;
}
static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
{
return get_dummy_ops(substream)->prepare(substream);
}
static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
{
return get_dummy_ops(substream)->pointer(substream);
}
static const struct snd_pcm_hardware dummy_pcm_hardware = {
.info = (SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_RESUME |
SNDRV_PCM_INFO_MMAP_VALID),
.formats = USE_FORMATS,
.rates = USE_RATE,
.rate_min = USE_RATE_MIN,
.rate_max = USE_RATE_MAX,
.channels_min = USE_CHANNELS_MIN,
.channels_max = USE_CHANNELS_MAX,
.buffer_bytes_max = MAX_BUFFER_SIZE,
.period_bytes_min = MIN_PERIOD_SIZE,
.period_bytes_max = MAX_PERIOD_SIZE,
.periods_min = USE_PERIODS_MIN,
.periods_max = USE_PERIODS_MAX,
.fifo_size = 0,
};
static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
if (fake_buffer) {
/* runtime->dma_bytes has to be set manually to allow mmap */
substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
return 0;
}
return snd_pcm_lib_malloc_pages(substream,
params_buffer_bytes(hw_params));
}
static int dummy_pcm_hw_free(struct snd_pcm_substream *substream)
{
if (fake_buffer)
return 0;
return snd_pcm_lib_free_pages(substream);
}
static int dummy_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
struct dummy_model *model = dummy->model;
struct snd_pcm_runtime *runtime = substream->runtime;
const struct dummy_timer_ops *ops;
int err;
ops = &dummy_systimer_ops;
#ifdef CONFIG_HIGH_RES_TIMERS
if (hrtimer)
ops = &dummy_hrtimer_ops;
#endif
err = ops->create(substream);
if (err < 0)
return err;
get_dummy_ops(substream) = ops;
runtime->hw = dummy->pcm_hw;
if (substream->pcm->device & 1) {
runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
}
if (substream->pcm->device & 2)
runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID);
if (model == NULL)
return 0;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
if (model->playback_constraints)
err = model->playback_constraints(substream->runtime);
} else {
if (model->capture_constraints)
err = model->capture_constraints(substream->runtime);
}
if (err < 0) {
get_dummy_ops(substream)->free(substream);
return err;
}
return 0;
}
static int dummy_pcm_close(struct snd_pcm_substream *substream)
{
get_dummy_ops(substream)->free(substream);
return 0;
}
/*
* dummy buffer handling
*/
static void *dummy_page[2];
static void free_fake_buffer(void)
{
if (fake_buffer) {
int i;
for (i = 0; i < 2; i++)
if (dummy_page[i]) {
free_page((unsigned long)dummy_page[i]);
dummy_page[i] = NULL;
}
}
}
static int alloc_fake_buffer(void)
{
int i;
if (!fake_buffer)
return 0;
for (i = 0; i < 2; i++) {
dummy_page[i] = (void *)get_zeroed_page(GFP_KERNEL);
if (!dummy_page[i]) {
free_fake_buffer();
return -ENOMEM;
}
}
return 0;
}
static int dummy_pcm_copy(struct snd_pcm_substream *substream,
int channel, unsigned long pos,
void __user *dst, unsigned long bytes)
{
return 0; /* do nothing */
}
static int dummy_pcm_copy_kernel(struct snd_pcm_substream *substream,
int channel, unsigned long pos,
void *dst, unsigned long bytes)
{
return 0; /* do nothing */
}
static int dummy_pcm_silence(struct snd_pcm_substream *substream,
int channel, unsigned long pos,
unsigned long bytes)
{
return 0; /* do nothing */
}
static struct page *dummy_pcm_page(struct snd_pcm_substream *substream,
unsigned long offset)
{
return virt_to_page(dummy_page[substream->stream]); /* the same page */
}
static struct snd_pcm_ops dummy_pcm_ops = {
.open = dummy_pcm_open,
.close = dummy_pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = dummy_pcm_hw_params,
.hw_free = dummy_pcm_hw_free,
.prepare = dummy_pcm_prepare,
.trigger = dummy_pcm_trigger,
.pointer = dummy_pcm_pointer,
};
static struct snd_pcm_ops dummy_pcm_ops_no_buf = {
.open = dummy_pcm_open,
.close = dummy_pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = dummy_pcm_hw_params,
.hw_free = dummy_pcm_hw_free,
.prepare = dummy_pcm_prepare,
.trigger = dummy_pcm_trigger,
.pointer = dummy_pcm_pointer,
.copy_user = dummy_pcm_copy,
.copy_kernel = dummy_pcm_copy_kernel,
.fill_silence = dummy_pcm_silence,
.page = dummy_pcm_page,
};
static int snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
int substreams)
{
struct snd_pcm *pcm;
struct snd_pcm_ops *ops;
int err;
err = snd_pcm_new(dummy->card, "Dummy PCM", device,
substreams, substreams, &pcm);
if (err < 0)
return err;
dummy->pcm = pcm;
if (fake_buffer)
ops = &dummy_pcm_ops_no_buf;
else
ops = &dummy_pcm_ops;
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops);
pcm->private_data = dummy;
pcm->info_flags = 0;
strcpy(pcm->name, "Dummy PCM");
if (!fake_buffer) {
snd_pcm_lib_preallocate_pages_for_all(pcm,
SNDRV_DMA_TYPE_CONTINUOUS,
snd_dma_continuous_data(GFP_KERNEL),
0, 64*1024);
}
return 0;
}
/*
* mixer interface
*/
#define DUMMY_VOLUME(xname, xindex, addr) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
.name = xname, .index = xindex, \
.info = snd_dummy_volume_info, \
.get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
.private_value = addr, \
.tlv = { .p = db_scale_dummy } }
static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
uinfo->count = 2;
uinfo->value.integer.min = -50;
uinfo->value.integer.max = 100;
return 0;
}
static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
int addr = kcontrol->private_value;
spin_lock_irq(&dummy->mixer_lock);
ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
spin_unlock_irq(&dummy->mixer_lock);
return 0;
}
static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
int change, addr = kcontrol->private_value;
int left, right;
left = ucontrol->value.integer.value[0];
if (left < -50)
left = -50;
if (left > 100)
left = 100;
right = ucontrol->value.integer.value[1];
if (right < -50)
right = -50;
if (right > 100)
right = 100;
spin_lock_irq(&dummy->mixer_lock);
change = dummy->mixer_volume[addr][0] != left ||
dummy->mixer_volume[addr][1] != right;
dummy->mixer_volume[addr][0] = left;
dummy->mixer_volume[addr][1] = right;
spin_unlock_irq(&dummy->mixer_lock);
return change;
}
static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
#define DUMMY_CAPSRC(xname, xindex, addr) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
.info = snd_dummy_capsrc_info, \
.get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
.private_value = addr }
#define snd_dummy_capsrc_info snd_ctl_boolean_stereo_info
static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
int addr = kcontrol->private_value;
spin_lock_irq(&dummy->mixer_lock);
ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
spin_unlock_irq(&dummy->mixer_lock);
return 0;
}
static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
int change, addr = kcontrol->private_value;
int left, right;
left = ucontrol->value.integer.value[0] & 1;
right = ucontrol->value.integer.value[1] & 1;
spin_lock_irq(&dummy->mixer_lock);
change = dummy->capture_source[addr][0] != left &&
dummy->capture_source[addr][1] != right;
dummy->capture_source[addr][0] = left;
dummy->capture_source[addr][1] = right;
spin_unlock_irq(&dummy->mixer_lock);
return change;
}
static int snd_dummy_iobox_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *info)
{
static const char *const names[] = { "None", "CD Player" };
return snd_ctl_enum_info(info, 1, 2, names);
}
static int snd_dummy_iobox_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *value)
{
struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
value->value.enumerated.item[0] = dummy->iobox;
return 0;
}
static int snd_dummy_iobox_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *value)
{
struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
int changed;
if (value->value.enumerated.item[0] > 1)
return -EINVAL;
changed = value->value.enumerated.item[0] != dummy->iobox;
if (changed) {
dummy->iobox = value->value.enumerated.item[0];
if (dummy->iobox) {
dummy->cd_volume_ctl->vd[0].access &=
~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
dummy->cd_switch_ctl->vd[0].access &=
~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
} else {
dummy->cd_volume_ctl->vd[0].access |=
SNDRV_CTL_ELEM_ACCESS_INACTIVE;
dummy->cd_switch_ctl->vd[0].access |=
SNDRV_CTL_ELEM_ACCESS_INACTIVE;
}
snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
&dummy->cd_volume_ctl->id);
snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
&dummy->cd_switch_ctl->id);
}
return changed;
}
static struct snd_kcontrol_new snd_dummy_controls[] = {
DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD),
{
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.name = "External I/O Box",
.info = snd_dummy_iobox_info,
.get = snd_dummy_iobox_get,
.put = snd_dummy_iobox_put,
},
};
static int snd_card_dummy_new_mixer(struct snd_dummy *dummy)
{
struct snd_card *card = dummy->card;
struct snd_kcontrol *kcontrol;
unsigned int idx;
int err;
spin_lock_init(&dummy->mixer_lock);
strcpy(card->mixername, "Dummy Mixer");
dummy->iobox = 1;
for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
kcontrol = snd_ctl_new1(&snd_dummy_controls[idx], dummy);
err = snd_ctl_add(card, kcontrol);
if (err < 0)
return err;
if (!strcmp(kcontrol->id.name, "CD Volume"))
dummy->cd_volume_ctl = kcontrol;
else if (!strcmp(kcontrol->id.name, "CD Capture Switch"))
dummy->cd_switch_ctl = kcontrol;
}
return 0;
}
#if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_PROC_FS)
/*
* proc interface
*/
static void print_formats(struct snd_dummy *dummy,
struct snd_info_buffer *buffer)
{
int i;
for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
if (dummy->pcm_hw.formats & (1ULL << i))
snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
}
}
static void print_rates(struct snd_dummy *dummy,
struct snd_info_buffer *buffer)
{
static int rates[] = {
5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
64000, 88200, 96000, 176400, 192000,
};
int i;
if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS)
snd_iprintf(buffer, " continuous");
if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT)
snd_iprintf(buffer, " knot");
for (i = 0; i < ARRAY_SIZE(rates); i++)
if (dummy->pcm_hw.rates & (1 << i))
snd_iprintf(buffer, " %d", rates[i]);
}
#define get_dummy_int_ptr(dummy, ofs) \
(unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs))
#define get_dummy_ll_ptr(dummy, ofs) \
(unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs))
struct dummy_hw_field {
const char *name;
const char *format;
unsigned int offset;
unsigned int size;
};
#define FIELD_ENTRY(item, fmt) { \
.name = #item, \
.format = fmt, \
.offset = offsetof(struct snd_pcm_hardware, item), \
.size = sizeof(dummy_pcm_hardware.item) }
static struct dummy_hw_field fields[] = {
FIELD_ENTRY(formats, "%#llx"),
FIELD_ENTRY(rates, "%#x"),
FIELD_ENTRY(rate_min, "%d"),
FIELD_ENTRY(rate_max, "%d"),
FIELD_ENTRY(channels_min, "%d"),
FIELD_ENTRY(channels_max, "%d"),
FIELD_ENTRY(buffer_bytes_max, "%ld"),
FIELD_ENTRY(period_bytes_min, "%ld"),
FIELD_ENTRY(period_bytes_max, "%ld"),
FIELD_ENTRY(periods_min, "%d"),
FIELD_ENTRY(periods_max, "%d"),
};
static void dummy_proc_read(struct snd_info_entry *entry,
struct snd_info_buffer *buffer)
{
struct snd_dummy *dummy = entry->private_data;
int i;
for (i = 0; i < ARRAY_SIZE(fields); i++) {
snd_iprintf(buffer, "%s ", fields[i].name);
if (fields[i].size == sizeof(int))
snd_iprintf(buffer, fields[i].format,
*get_dummy_int_ptr(dummy, fields[i].offset));
else
snd_iprintf(buffer, fields[i].format,
*get_dummy_ll_ptr(dummy, fields[i].offset));
if (!strcmp(fields[i].name, "formats"))
print_formats(dummy, buffer);
else if (!strcmp(fields[i].name, "rates"))
print_rates(dummy, buffer);
snd_iprintf(buffer, "\n");
}
}
static void dummy_proc_write(struct snd_info_entry *entry,
struct snd_info_buffer *buffer)
{
struct snd_dummy *dummy = entry->private_data;
char line[64];
while (!snd_info_get_line(buffer, line, sizeof(line))) {
char item[20];
const char *ptr;
unsigned long long val;
int i;
ptr = snd_info_get_str(item, line, sizeof(item));
for (i = 0; i < ARRAY_SIZE(fields); i++) {
if (!strcmp(item, fields[i].name))
break;
}
if (i >= ARRAY_SIZE(fields))
continue;
snd_info_get_str(item, ptr, sizeof(item));
if (kstrtoull(item, 0, &val))
continue;
if (fields[i].size == sizeof(int))
*get_dummy_int_ptr(dummy, fields[i].offset) = val;
else
*get_dummy_ll_ptr(dummy, fields[i].offset) = val;
}
}
static void dummy_proc_init(struct snd_dummy *chip)
{
snd_card_rw_proc_new(chip->card, "dummy_pcm", chip,
dummy_proc_read, dummy_proc_write);
}
#else
#define dummy_proc_init(x)
#endif /* CONFIG_SND_DEBUG && CONFIG_SND_PROC_FS */
static int snd_dummy_probe(struct platform_device *devptr)
{
struct snd_card *card;
struct snd_dummy *dummy;
struct dummy_model *m = NULL, **mdl;
int idx, err;
int dev = devptr->id;
err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
sizeof(struct snd_dummy), &card);
if (err < 0)
return err;
dummy = card->private_data;
dummy->card = card;
for (mdl = dummy_models; *mdl && model[dev]; mdl++) {
if (strcmp(model[dev], (*mdl)->name) == 0) {
printk(KERN_INFO
"snd-dummy: Using model '%s' for card %i\n",
(*mdl)->name, card->number);
m = dummy->model = *mdl;
break;
}
}
for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
if (pcm_substreams[dev] < 1)
pcm_substreams[dev] = 1;
if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
if (err < 0)
goto __nodev;
}
dummy->pcm_hw = dummy_pcm_hardware;
if (m) {
if (m->formats)
dummy->pcm_hw.formats = m->formats;
if (m->buffer_bytes_max)
dummy->pcm_hw.buffer_bytes_max = m->buffer_bytes_max;
if (m->period_bytes_min)
dummy->pcm_hw.period_bytes_min = m->period_bytes_min;
if (m->period_bytes_max)
dummy->pcm_hw.period_bytes_max = m->period_bytes_max;
if (m->periods_min)
dummy->pcm_hw.periods_min = m->periods_min;
if (m->periods_max)
dummy->pcm_hw.periods_max = m->periods_max;
if (m->rates)
dummy->pcm_hw.rates = m->rates;
if (m->rate_min)
dummy->pcm_hw.rate_min = m->rate_min;
if (m->rate_max)
dummy->pcm_hw.rate_max = m->rate_max;
if (m->channels_min)
dummy->pcm_hw.channels_min = m->channels_min;
if (m->channels_max)
dummy->pcm_hw.channels_max = m->channels_max;
}
err = snd_card_dummy_new_mixer(dummy);
if (err < 0)
goto __nodev;
strcpy(card->driver, "Dummy");
strcpy(card->shortname, "Dummy");
sprintf(card->longname, "Dummy %i", dev + 1);
dummy_proc_init(dummy);
err = snd_card_register(card);
if (err == 0) {
platform_set_drvdata(devptr, card);
return 0;
}
__nodev:
snd_card_free(card);
return err;
}
static int snd_dummy_remove(struct platform_device *devptr)
{
snd_card_free(platform_get_drvdata(devptr));
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int snd_dummy_suspend(struct device *pdev)
{
struct snd_card *card = dev_get_drvdata(pdev);
snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
return 0;
}
static int snd_dummy_resume(struct device *pdev)
{
struct snd_card *card = dev_get_drvdata(pdev);
snd_power_change_state(card, SNDRV_CTL_POWER_D0);
return 0;
}
static SIMPLE_DEV_PM_OPS(snd_dummy_pm, snd_dummy_suspend, snd_dummy_resume);
#define SND_DUMMY_PM_OPS &snd_dummy_pm
#else
#define SND_DUMMY_PM_OPS NULL
#endif
#define SND_DUMMY_DRIVER "snd_dummy"
static struct platform_driver snd_dummy_driver = {
.probe = snd_dummy_probe,
.remove = snd_dummy_remove,
.driver = {
.name = SND_DUMMY_DRIVER,
.pm = SND_DUMMY_PM_OPS,
},
};
static void snd_dummy_unregister_all(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(devices); ++i)
platform_device_unregister(devices[i]);
platform_driver_unregister(&snd_dummy_driver);
free_fake_buffer();
}
static int __init alsa_card_dummy_init(void)
{
int i, cards, err;
err = platform_driver_register(&snd_dummy_driver);
if (err < 0)
return err;
err = alloc_fake_buffer();
if (err < 0) {
platform_driver_unregister(&snd_dummy_driver);
return err;
}
cards = 0;
for (i = 0; i < SNDRV_CARDS; i++) {
struct platform_device *device;
if (! enable[i])
continue;
device = platform_device_register_simple(SND_DUMMY_DRIVER,
i, NULL, 0);
if (IS_ERR(device))
continue;
if (!platform_get_drvdata(device)) {
platform_device_unregister(device);
continue;
}
devices[i] = device;
cards++;
}
if (!cards) {
#ifdef MODULE
printk(KERN_ERR "Dummy soundcard not found or device busy\n");
#endif
snd_dummy_unregister_all();
return -ENODEV;
}
return 0;
}
static void __exit alsa_card_dummy_exit(void)
{
snd_dummy_unregister_all();
}
module_init(alsa_card_dummy_init)
module_exit(alsa_card_dummy_exit)