--- /dev/null
+/*
+ * Dummy soundcard
+ * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
+ *
+ * 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
+ *
+ */
+
+#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 *);
+};
+
+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;
+ const struct dummy_timer_ops *timer_ops;
+};
+
+/*
+ * 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;
+}
+
+struct dummy_model model_emu10k1 = {
+ .name = "emu10k1",
+ .playback_constraints = emu10k1_playback_constraints,
+ .buffer_bytes_max = 128 * 1024,
+};
+
+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,
+};
+
+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,
+};
+
+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,
+};
+
+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,
+};
+
+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,
+};
+
+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 {
+ 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(unsigned long data)
+{
+ struct dummy_systimer_pcm *dpcm = (struct dummy_systimer_pcm *)data;
+ 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;
+ setup_timer(&dpcm->timer, dummy_systimer_callback,
+ (unsigned long) dpcm);
+ 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 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 {
+ ktime_t base_time;
+ ktime_t period_time;
+ atomic_t running;
+ struct hrtimer timer;
+ struct tasklet_struct tasklet;
+ struct snd_pcm_substream *substream;
+};
+
+static void dummy_hrtimer_pcm_elapsed(unsigned long priv)
+{
+ struct dummy_hrtimer_pcm *dpcm = (struct dummy_hrtimer_pcm *)priv;
+ if (atomic_read(&dpcm->running))
+ snd_pcm_period_elapsed(dpcm->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;
+ tasklet_schedule(&dpcm->tasklet);
+ 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);
+ 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);
+ hrtimer_cancel(&dpcm->timer);
+ return 0;
+}
+
+static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
+{
+ tasklet_kill(&dpcm->tasklet);
+}
+
+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);
+ dpcm->timer.function = dummy_hrtimer_callback;
+ dpcm->substream = substream;
+ atomic_set(&dpcm->running, 0);
+ tasklet_init(&dpcm->tasklet, dummy_hrtimer_pcm_elapsed,
+ (unsigned long)dpcm);
+ 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 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)
+{
+ struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ return dummy->timer_ops->start(substream);
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ return dummy->timer_ops->stop(substream);
+ }
+ return -EINVAL;
+}
+
+static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
+{
+ struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
+
+ return dummy->timer_ops->prepare(substream);
+}
+
+static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
+{
+ struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
+
+ return dummy->timer_ops->pointer(substream);
+}
+
+static 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;
+ int err;
+
+ dummy->timer_ops = &dummy_systimer_ops;
+#ifdef CONFIG_HIGH_RES_TIMERS
+ if (hrtimer)
+ dummy->timer_ops = &dummy_hrtimer_ops;
+#endif
+
+ err = dummy->timer_ops->create(substream);
+ if (err < 0)
+ return err;
+
+ 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) {
+ dummy->timer_ops->free(substream);
+ return err;
+ }
+ return 0;
+}
+
+static int dummy_pcm_close(struct snd_pcm_substream *substream)
+{
+ struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
+ dummy->timer_ops->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, snd_pcm_uframes_t pos,
+ void __user *dst, snd_pcm_uframes_t count)
+{
+ return 0; /* do nothing */
+}
+
+static int dummy_pcm_silence(struct snd_pcm_substream *substream,
+ int channel, snd_pcm_uframes_t pos,
+ snd_pcm_uframes_t count)
+{
+ 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 = dummy_pcm_copy,
+ .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)
+{
+ 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_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)
+{
+ struct snd_info_entry *entry;
+
+ if (!snd_card_proc_new(chip->card, "dummy_pcm", &entry)) {
+ snd_info_set_text_ops(entry, chip, dummy_proc_read);
+ entry->c.text.write = dummy_proc_write;
+ entry->mode |= S_IWUSR;
+ entry->private_data = chip;
+ }
+}
+#else
+#define dummy_proc_init(x)
+#endif /* CONFIG_SND_DEBUG && CONFIG_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);
+ struct snd_dummy *dummy = card->private_data;
+
+ snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
+ snd_pcm_suspend_all(dummy->pcm);
+ 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)
Code Review / kvmfornfv.git / blobdiff