diff options
Diffstat (limited to 'sound/drivers/dummy.c')
| -rw-r--r-- | sound/drivers/dummy.c | 1157 |
1 files changed, 1157 insertions, 0 deletions
diff --git a/sound/drivers/dummy.c b/sound/drivers/dummy.c new file mode 100644 index 00000000..ad9434fd --- /dev/null +++ b/sound/drivers/dummy.c @@ -0,0 +1,1157 @@ +/* + * 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]; + 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) +{ + dpcm->timer.expires = jiffies + + (dpcm->frac_period_rest + dpcm->rate - 1) / dpcm->rate; + add_timer(&dpcm->timer); +} + +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; + init_timer(&dpcm->timer); + dpcm->timer.data = (unsigned long) dpcm; + dpcm->timer.function = dummy_systimer_callback; + 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 __devinit 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 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) +}; + +static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy) +{ + struct snd_card *card = dummy->card; + unsigned int idx; + int err; + + spin_lock_init(&dummy->mixer_lock); + strcpy(card->mixername, "Dummy Mixer"); + + for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) { + err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy)); + if (err < 0) + return err; + } + 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 (strict_strtoull(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 __devinit 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 __devinit 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_create(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); + + snd_card_set_dev(card, &devptr->dev); + + err = snd_card_register(card); + if (err == 0) { + platform_set_drvdata(devptr, card); + return 0; + } + __nodev: + snd_card_free(card); + return err; +} + +static int __devexit snd_dummy_remove(struct platform_device *devptr) +{ + snd_card_free(platform_get_drvdata(devptr)); + platform_set_drvdata(devptr, NULL); + return 0; +} + +#ifdef CONFIG_PM +static int snd_dummy_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct snd_card *card = platform_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 platform_device *pdev) +{ + struct snd_card *card = platform_get_drvdata(pdev); + + snd_power_change_state(card, SNDRV_CTL_POWER_D0); + return 0; +} +#endif + +#define SND_DUMMY_DRIVER "snd_dummy" + +static struct platform_driver snd_dummy_driver = { + .probe = snd_dummy_probe, + .remove = __devexit_p(snd_dummy_remove), +#ifdef CONFIG_PM + .suspend = snd_dummy_suspend, + .resume = snd_dummy_resume, +#endif + .driver = { + .name = SND_DUMMY_DRIVER + }, +}; + +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) |