Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1074 insertions, 0 deletions

diff --git a/sound/core/pcm.c b/sound/core/pcm.c
new file mode 100644
index 0000000..8d94325
--- /dev/null
+++ b/sound/core/pcm.c
@@ -0,0 +1,1074 @@
+/*
+ *  Digital Audio (PCM) abstract layer
+ *  Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <sound/core.h>
+#include <sound/minors.h>
+#include <sound/pcm.h>
+#include <sound/control.h>
+#include <sound/info.h>
+
+MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Abramo Bagnara <abramo@alsa-project.org>");
+MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
+MODULE_LICENSE("GPL");
+
+snd_pcm_t *snd_pcm_devices[SNDRV_CARDS * SNDRV_PCM_DEVICES];
+static LIST_HEAD(snd_pcm_notify_list);
+static DECLARE_MUTEX(register_mutex);
+
+static int snd_pcm_free(snd_pcm_t *pcm);
+static int snd_pcm_dev_free(snd_device_t *device);
+static int snd_pcm_dev_register(snd_device_t *device);
+static int snd_pcm_dev_disconnect(snd_device_t *device);
+static int snd_pcm_dev_unregister(snd_device_t *device);
+
+static int snd_pcm_control_ioctl(snd_card_t * card,
+				 snd_ctl_file_t * control,
+				 unsigned int cmd, unsigned long arg)
+{
+	unsigned int tmp;
+
+	tmp = card->number * SNDRV_PCM_DEVICES;
+	switch (cmd) {
+	case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
+		{
+			int device;
+
+			if (get_user(device, (int __user *)arg))
+				return -EFAULT;
+			device = device < 0 ? 0 : device + 1;
+			while (device < SNDRV_PCM_DEVICES) {
+				if (snd_pcm_devices[tmp + device])
+					break;
+				device++;
+			}
+			if (device == SNDRV_PCM_DEVICES)
+				device = -1;
+			if (put_user(device, (int __user *)arg))
+				return -EFAULT;
+			return 0;
+		}
+	case SNDRV_CTL_IOCTL_PCM_INFO:
+		{
+			snd_pcm_info_t __user *info;
+			unsigned int device, subdevice;
+			snd_pcm_stream_t stream;
+			snd_pcm_t *pcm;
+			snd_pcm_str_t *pstr;
+			snd_pcm_substream_t *substream;
+			info = (snd_pcm_info_t __user *)arg;
+			if (get_user(device, &info->device))
+				return -EFAULT;
+			if (device >= SNDRV_PCM_DEVICES)
+				return -ENXIO;
+			pcm = snd_pcm_devices[tmp + device];
+			if (pcm == NULL)
+				return -ENXIO;
+			if (get_user(stream, &info->stream))
+				return -EFAULT;
+			if (stream < 0 || stream > 1)
+				return -EINVAL;
+			pstr = &pcm->streams[stream];
+			if (pstr->substream_count == 0)
+				return -ENOENT;
+			if (get_user(subdevice, &info->subdevice))
+				return -EFAULT;
+			if (subdevice >= pstr->substream_count)
+				return -ENXIO;
+			for (substream = pstr->substream; substream; substream = substream->next)
+				if (substream->number == (int)subdevice)
+					break;
+			if (substream == NULL)
+				return -ENXIO;
+			return snd_pcm_info_user(substream, info);
+		}
+	case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
+		{
+			int val;
+			
+			if (get_user(val, (int __user *)arg))
+				return -EFAULT;
+			control->prefer_pcm_subdevice = val;
+			return 0;
+		}
+	}
+	return -ENOIOCTLCMD;
+}
+#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
+#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
+#define READY(v) [SNDRV_PCM_READY_##v] = #v
+#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
+#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
+#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
+#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
+#define START(v) [SNDRV_PCM_START_##v] = #v
+#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
+#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 
+
+static char *snd_pcm_stream_names[] = {
+	STREAM(PLAYBACK),
+	STREAM(CAPTURE),
+};
+
+static char *snd_pcm_state_names[] = {
+	STATE(OPEN),
+	STATE(SETUP),
+	STATE(PREPARED),
+	STATE(RUNNING),
+	STATE(XRUN),
+	STATE(DRAINING),
+	STATE(PAUSED),
+	STATE(SUSPENDED),
+};
+
+static char *snd_pcm_access_names[] = {
+	ACCESS(MMAP_INTERLEAVED), 
+	ACCESS(MMAP_NONINTERLEAVED),
+	ACCESS(MMAP_COMPLEX),
+	ACCESS(RW_INTERLEAVED),
+	ACCESS(RW_NONINTERLEAVED),
+};
+
+static char *snd_pcm_format_names[] = {
+	FORMAT(S8),
+	FORMAT(U8),
+	FORMAT(S16_LE),
+	FORMAT(S16_BE),
+	FORMAT(U16_LE),
+	FORMAT(U16_BE),
+	FORMAT(S24_LE),
+	FORMAT(S24_BE),
+	FORMAT(U24_LE),
+	FORMAT(U24_BE),
+	FORMAT(S32_LE),
+	FORMAT(S32_BE),
+	FORMAT(U32_LE),
+	FORMAT(U32_BE),
+	FORMAT(FLOAT_LE),
+	FORMAT(FLOAT_BE),
+	FORMAT(FLOAT64_LE),
+	FORMAT(FLOAT64_BE),
+	FORMAT(IEC958_SUBFRAME_LE),
+	FORMAT(IEC958_SUBFRAME_BE),
+	FORMAT(MU_LAW),
+	FORMAT(A_LAW),
+	FORMAT(IMA_ADPCM),
+	FORMAT(MPEG),
+	FORMAT(GSM),
+	FORMAT(SPECIAL),
+	FORMAT(S24_3LE),
+	FORMAT(S24_3BE),
+	FORMAT(U24_3LE),
+	FORMAT(U24_3BE),
+	FORMAT(S20_3LE),
+	FORMAT(S20_3BE),
+	FORMAT(U20_3LE),
+	FORMAT(U20_3BE),
+	FORMAT(S18_3LE),
+	FORMAT(S18_3BE),
+	FORMAT(U18_3LE),
+	FORMAT(U18_3BE),
+};
+
+static char *snd_pcm_subformat_names[] = {
+	SUBFORMAT(STD), 
+};
+
+static char *snd_pcm_tstamp_mode_names[] = {
+	TSTAMP(NONE),
+	TSTAMP(MMAP),
+};
+
+static const char *snd_pcm_stream_name(snd_pcm_stream_t stream)
+{
+	snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
+	return snd_pcm_stream_names[stream];
+}
+
+static const char *snd_pcm_access_name(snd_pcm_access_t access)
+{
+	snd_assert(access <= SNDRV_PCM_ACCESS_LAST, return NULL);
+	return snd_pcm_access_names[access];
+}
+
+const char *snd_pcm_format_name(snd_pcm_format_t format)
+{
+	snd_assert(format <= SNDRV_PCM_FORMAT_LAST, return NULL);
+	return snd_pcm_format_names[format];
+}
+
+static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
+{
+	snd_assert(subformat <= SNDRV_PCM_SUBFORMAT_LAST, return NULL);
+	return snd_pcm_subformat_names[subformat];
+}
+
+static const char *snd_pcm_tstamp_mode_name(snd_pcm_tstamp_t mode)
+{
+	snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
+	return snd_pcm_tstamp_mode_names[mode];
+}
+
+static const char *snd_pcm_state_name(snd_pcm_state_t state)
+{
+	snd_assert(state <= SNDRV_PCM_STATE_LAST, return NULL);
+	return snd_pcm_state_names[state];
+}
+
+#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
+#include <linux/soundcard.h>
+static const char *snd_pcm_oss_format_name(int format)
+{
+	switch (format) {
+	case AFMT_MU_LAW:
+		return "MU_LAW";
+	case AFMT_A_LAW:
+		return "A_LAW";
+	case AFMT_IMA_ADPCM:
+		return "IMA_ADPCM";
+	case AFMT_U8:
+		return "U8";
+	case AFMT_S16_LE:
+		return "S16_LE";
+	case AFMT_S16_BE:
+		return "S16_BE";
+	case AFMT_S8:
+		return "S8";
+	case AFMT_U16_LE:
+		return "U16_LE";
+	case AFMT_U16_BE:
+		return "U16_BE";
+	case AFMT_MPEG:
+		return "MPEG";
+	default:
+		return "unknown";
+	}
+}
+#endif
+
+#ifdef CONFIG_PROC_FS
+static void snd_pcm_proc_info_read(snd_pcm_substream_t *substream, snd_info_buffer_t *buffer)
+{
+	snd_pcm_info_t *info;
+	int err;
+
+	snd_runtime_check(substream, return);
+
+	info = kmalloc(sizeof(*info), GFP_KERNEL);
+	if (! info) {
+		printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
+		return;
+	}
+
+	err = snd_pcm_info(substream, info);
+	if (err < 0) {
+		snd_iprintf(buffer, "error %d\n", err);
+		kfree(info);
+		return;
+	}
+	snd_iprintf(buffer, "card: %d\n", info->card);
+	snd_iprintf(buffer, "device: %d\n", info->device);
+	snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
+	snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
+	snd_iprintf(buffer, "id: %s\n", info->id);
+	snd_iprintf(buffer, "name: %s\n", info->name);
+	snd_iprintf(buffer, "subname: %s\n", info->subname);
+	snd_iprintf(buffer, "class: %d\n", info->dev_class);
+	snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
+	snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
+	snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
+	kfree(info);
+}
+
+static void snd_pcm_stream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
+{
+	snd_pcm_proc_info_read(((snd_pcm_str_t *)entry->private_data)->substream, buffer);
+}
+
+static void snd_pcm_substream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
+{
+	snd_pcm_proc_info_read((snd_pcm_substream_t *)entry->private_data, buffer);
+}
+
+static void snd_pcm_substream_proc_hw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
+{
+	snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
+	snd_pcm_runtime_t *runtime = substream->runtime;
+	if (!runtime) {
+		snd_iprintf(buffer, "closed\n");
+		return;
+	}
+	snd_pcm_stream_lock_irq(substream);
+	if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
+		snd_iprintf(buffer, "no setup\n");
+		snd_pcm_stream_unlock_irq(substream);
+		return;
+	}
+	snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
+	snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
+	snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
+	snd_iprintf(buffer, "channels: %u\n", runtime->channels);	
+	snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);	
+	snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);	
+	snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);	
+	snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
+#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
+	if (substream->oss.oss) {
+		snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
+		snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);	
+		snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
+		snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
+		snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
+		snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
+	}
+#endif
+	snd_pcm_stream_unlock_irq(substream);
+}
+
+static void snd_pcm_substream_proc_sw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
+{
+	snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
+	snd_pcm_runtime_t *runtime = substream->runtime;
+	if (!runtime) {
+		snd_iprintf(buffer, "closed\n");
+		return;
+	}
+	snd_pcm_stream_lock_irq(substream);
+	if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
+		snd_iprintf(buffer, "no setup\n");
+		snd_pcm_stream_unlock_irq(substream);
+		return;
+	}
+	snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
+	snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
+	snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
+	snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
+	snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
+	snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
+	snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
+	snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
+	snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
+	snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
+	snd_pcm_stream_unlock_irq(substream);
+}
+
+static void snd_pcm_substream_proc_status_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
+{
+	snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
+	snd_pcm_runtime_t *runtime = substream->runtime;
+	snd_pcm_status_t status;
+	int err;
+	if (!runtime) {
+		snd_iprintf(buffer, "closed\n");
+		return;
+	}
+	memset(&status, 0, sizeof(status));
+	err = snd_pcm_status(substream, &status);
+	if (err < 0) {
+		snd_iprintf(buffer, "error %d\n", err);
+		return;
+	}
+	snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
+	snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
+		status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
+	snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
+		status.tstamp.tv_sec, status.tstamp.tv_nsec);
+	snd_iprintf(buffer, "delay       : %ld\n", status.delay);
+	snd_iprintf(buffer, "avail       : %ld\n", status.avail);
+	snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
+	snd_iprintf(buffer, "-----\n");
+	snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
+	snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
+}
+#endif
+
+#ifdef CONFIG_SND_DEBUG
+static void snd_pcm_xrun_debug_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
+{
+	snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data;
+	snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
+}
+
+static void snd_pcm_xrun_debug_write(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
+{
+	snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data;
+	char line[64];
+	if (!snd_info_get_line(buffer, line, sizeof(line)))
+		pstr->xrun_debug = simple_strtoul(line, NULL, 10);
+}
+#endif
+
+static int snd_pcm_stream_proc_init(snd_pcm_str_t *pstr)
+{
+	snd_pcm_t *pcm = pstr->pcm;
+	snd_info_entry_t *entry;
+	char name[16];
+
+	sprintf(name, "pcm%i%c", pcm->device, 
+		pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
+	if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
+		return -ENOMEM;
+	entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
+	if (snd_info_register(entry) < 0) {
+		snd_info_free_entry(entry);
+		return -ENOMEM;
+	}
+	pstr->proc_root = entry;
+
+	if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
+		snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read);
+		if (snd_info_register(entry) < 0) {
+			snd_info_free_entry(entry);
+			entry = NULL;
+		}
+	}
+	pstr->proc_info_entry = entry;
+
+#ifdef CONFIG_SND_DEBUG
+	if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", pstr->proc_root)) != NULL) {
+		entry->c.text.read_size = 64;
+		entry->c.text.read = snd_pcm_xrun_debug_read;
+		entry->c.text.write_size = 64;
+		entry->c.text.write = snd_pcm_xrun_debug_write;
+		entry->private_data = pstr;
+		if (snd_info_register(entry) < 0) {
+			snd_info_free_entry(entry);
+			entry = NULL;
+		}
+	}
+	pstr->proc_xrun_debug_entry = entry;
+#endif
+	return 0;
+}
+
+static int snd_pcm_stream_proc_done(snd_pcm_str_t *pstr)
+{
+#ifdef CONFIG_SND_DEBUG
+	if (pstr->proc_xrun_debug_entry) {
+		snd_info_unregister(pstr->proc_xrun_debug_entry);
+		pstr->proc_xrun_debug_entry = NULL;
+	}
+#endif
+	if (pstr->proc_info_entry) {
+		snd_info_unregister(pstr->proc_info_entry);
+		pstr->proc_info_entry = NULL;
+	}
+	if (pstr->proc_root) {
+		snd_info_unregister(pstr->proc_root);
+		pstr->proc_root = NULL;
+	}
+	return 0;
+}
+
+static int snd_pcm_substream_proc_init(snd_pcm_substream_t *substream)
+{
+	snd_info_entry_t *entry;
+	snd_card_t *card;
+	char name[16];
+
+	card = substream->pcm->card;
+
+	sprintf(name, "sub%i", substream->number);
+	if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
+		return -ENOMEM;
+	entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
+	if (snd_info_register(entry) < 0) {
+		snd_info_free_entry(entry);
+		return -ENOMEM;
+	}
+	substream->proc_root = entry;
+
+	if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
+		snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read);
+		if (snd_info_register(entry) < 0) {
+			snd_info_free_entry(entry);
+			entry = NULL;
+		}
+	}
+	substream->proc_info_entry = entry;
+
+	if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
+		snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read);
+		if (snd_info_register(entry) < 0) {
+			snd_info_free_entry(entry);
+			entry = NULL;
+		}
+	}
+	substream->proc_hw_params_entry = entry;
+
+	if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
+		snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read);
+		if (snd_info_register(entry) < 0) {
+			snd_info_free_entry(entry);
+			entry = NULL;
+		}
+	}
+	substream->proc_sw_params_entry = entry;
+
+	if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
+		snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read);
+		if (snd_info_register(entry) < 0) {
+			snd_info_free_entry(entry);
+			entry = NULL;
+		}
+	}
+	substream->proc_status_entry = entry;
+
+	return 0;
+}
+		
+static int snd_pcm_substream_proc_done(snd_pcm_substream_t *substream)
+{
+	if (substream->proc_info_entry) {
+		snd_info_unregister(substream->proc_info_entry);
+		substream->proc_info_entry = NULL;
+	}
+	if (substream->proc_hw_params_entry) {
+		snd_info_unregister(substream->proc_hw_params_entry);
+		substream->proc_hw_params_entry = NULL;
+	}
+	if (substream->proc_sw_params_entry) {
+		snd_info_unregister(substream->proc_sw_params_entry);
+		substream->proc_sw_params_entry = NULL;
+	}
+	if (substream->proc_status_entry) {
+		snd_info_unregister(substream->proc_status_entry);
+		substream->proc_status_entry = NULL;
+	}
+	if (substream->proc_root) {
+		snd_info_unregister(substream->proc_root);
+		substream->proc_root = NULL;
+	}
+	return 0;
+}
+
+/**
+ * snd_pcm_new_stream - create a new PCM stream
+ * @pcm: the pcm instance
+ * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
+ * @substream_count: the number of substreams
+ *
+ * Creates a new stream for the pcm.
+ * The corresponding stream on the pcm must have been empty before
+ * calling this, i.e. zero must be given to the argument of
+ * snd_pcm_new().
+ *
+ * Returns zero if successful, or a negative error code on failure.
+ */
+int snd_pcm_new_stream(snd_pcm_t *pcm, int stream, int substream_count)
+{
+	int idx, err;
+	snd_pcm_str_t *pstr = &pcm->streams[stream];
+	snd_pcm_substream_t *substream, *prev;
+
+#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
+	init_MUTEX(&pstr->oss.setup_mutex);
+#endif
+	pstr->stream = stream;
+	pstr->pcm = pcm;
+	pstr->substream_count = substream_count;
+	pstr->reg = &snd_pcm_reg[stream];
+	if (substream_count > 0) {
+		err = snd_pcm_stream_proc_init(pstr);
+		if (err < 0)
+			return err;
+	}
+	prev = NULL;
+	for (idx = 0, prev = NULL; idx < substream_count; idx++) {
+		substream = kcalloc(1, sizeof(*substream), GFP_KERNEL);
+		if (substream == NULL)
+			return -ENOMEM;
+		substream->pcm = pcm;
+		substream->pstr = pstr;
+		substream->number = idx;
+		substream->stream = stream;
+		sprintf(substream->name, "subdevice #%i", idx);
+		substream->buffer_bytes_max = UINT_MAX;
+		if (prev == NULL)
+			pstr->substream = substream;
+		else
+			prev->next = substream;
+		err = snd_pcm_substream_proc_init(substream);
+		if (err < 0) {
+			kfree(substream);
+			return err;
+		}
+		substream->group = &substream->self_group;
+		spin_lock_init(&substream->self_group.lock);
+		INIT_LIST_HEAD(&substream->self_group.substreams);
+		list_add_tail(&substream->link_list, &substream->self_group.substreams);
+		spin_lock_init(&substream->timer_lock);
+		prev = substream;
+	}
+	return 0;
+}				
+
+/**
+ * snd_pcm_new - create a new PCM instance
+ * @card: the card instance
+ * @id: the id string
+ * @device: the device index (zero based)
+ * @playback_count: the number of substreams for playback
+ * @capture_count: the number of substreams for capture
+ * @rpcm: the pointer to store the new pcm instance
+ *
+ * Creates a new PCM instance.
+ *
+ * The pcm operators have to be set afterwards to the new instance
+ * via snd_pcm_set_ops().
+ *
+ * Returns zero if successful, or a negative error code on failure.
+ */
+int snd_pcm_new(snd_card_t * card, char *id, int device,
+		int playback_count, int capture_count,
+	        snd_pcm_t ** rpcm)
+{
+	snd_pcm_t *pcm;
+	int err;
+	static snd_device_ops_t ops = {
+		.dev_free = snd_pcm_dev_free,
+		.dev_register =	snd_pcm_dev_register,
+		.dev_disconnect = snd_pcm_dev_disconnect,
+		.dev_unregister = snd_pcm_dev_unregister
+	};
+
+	snd_assert(rpcm != NULL, return -EINVAL);
+	*rpcm = NULL;
+	snd_assert(card != NULL, return -ENXIO);
+	pcm = kcalloc(1, sizeof(*pcm), GFP_KERNEL);
+	if (pcm == NULL)
+		return -ENOMEM;
+	pcm->card = card;
+	pcm->device = device;
+	if (id) {
+		strlcpy(pcm->id, id, sizeof(pcm->id));
+	}
+	if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
+		snd_pcm_free(pcm);
+		return err;
+	}
+	if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
+		snd_pcm_free(pcm);
+		return err;
+	}
+	init_MUTEX(&pcm->open_mutex);
+	init_waitqueue_head(&pcm->open_wait);
+	if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
+		snd_pcm_free(pcm);
+		return err;
+	}
+	*rpcm = pcm;
+	return 0;
+}
+
+static void snd_pcm_free_stream(snd_pcm_str_t * pstr)
+{
+	snd_pcm_substream_t *substream, *substream_next;
+#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
+	snd_pcm_oss_setup_t *setup, *setupn;
+#endif
+	substream = pstr->substream;
+	while (substream) {
+		substream_next = substream->next;
+		snd_pcm_substream_proc_done(substream);
+		kfree(substream);
+		substream = substream_next;
+	}
+	snd_pcm_stream_proc_done(pstr);
+#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
+	for (setup = pstr->oss.setup_list; setup; setup = setupn) {
+		setupn = setup->next;
+		kfree(setup->task_name);
+		kfree(setup);
+	}
+#endif
+}
+
+static int snd_pcm_free(snd_pcm_t *pcm)
+{
+	snd_assert(pcm != NULL, return -ENXIO);
+	if (pcm->private_free)
+		pcm->private_free(pcm);
+	snd_pcm_lib_preallocate_free_for_all(pcm);
+	snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
+	snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
+	kfree(pcm);
+	return 0;
+}
+
+static int snd_pcm_dev_free(snd_device_t *device)
+{
+	snd_pcm_t *pcm = device->device_data;
+	return snd_pcm_free(pcm);
+}
+
+static void snd_pcm_tick_timer_func(unsigned long data)
+{
+	snd_pcm_substream_t *substream = (snd_pcm_substream_t*) data;
+	snd_pcm_tick_elapsed(substream);
+}
+
+int snd_pcm_open_substream(snd_pcm_t *pcm, int stream,
+			   snd_pcm_substream_t **rsubstream)
+{
+	snd_pcm_str_t * pstr;
+	snd_pcm_substream_t * substream;
+	snd_pcm_runtime_t * runtime;
+	snd_ctl_file_t *kctl;
+	snd_card_t *card;
+	struct list_head *list;
+	int prefer_subdevice = -1;
+	size_t size;
+
+	snd_assert(rsubstream != NULL, return -EINVAL);
+	*rsubstream = NULL;
+	snd_assert(pcm != NULL, return -ENXIO);
+	pstr = &pcm->streams[stream];
+	if (pstr->substream == NULL)
+		return -ENODEV;
+
+	card = pcm->card;
+	down_read(&card->controls_rwsem);
+	list_for_each(list, &card->ctl_files) {
+		kctl = snd_ctl_file(list);
+		if (kctl->pid == current->pid) {
+			prefer_subdevice = kctl->prefer_pcm_subdevice;
+			break;
+		}
+	}
+	up_read(&card->controls_rwsem);
+
+	if (pstr->substream_count == 0)
+		return -ENODEV;
+	switch (stream) {
+	case SNDRV_PCM_STREAM_PLAYBACK:
+		if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
+			for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
+				if (SUBSTREAM_BUSY(substream))
+					return -EAGAIN;
+			}
+		}
+		break;
+	case SNDRV_PCM_STREAM_CAPTURE:
+		if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
+			for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
+				if (SUBSTREAM_BUSY(substream))
+					return -EAGAIN;
+			}
+		}
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (prefer_subdevice >= 0) {
+		for (substream = pstr->substream; substream; substream = substream->next)
+			if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
+				goto __ok;
+	}
+	for (substream = pstr->substream; substream; substream = substream->next)
+		if (!SUBSTREAM_BUSY(substream))
+			break;
+      __ok:
+	if (substream == NULL)
+		return -EAGAIN;
+
+	runtime = kcalloc(1, sizeof(*runtime), GFP_KERNEL);
+	if (runtime == NULL)
+		return -ENOMEM;
+
+	size = PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t));
+	runtime->status = snd_malloc_pages(size, GFP_KERNEL);
+	if (runtime->status == NULL) {
+		kfree(runtime);
+		return -ENOMEM;
+	}
+	memset((void*)runtime->status, 0, size);
+
+	size = PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t));
+	runtime->control = snd_malloc_pages(size, GFP_KERNEL);
+	if (runtime->control == NULL) {
+		snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)));
+		kfree(runtime);
+		return -ENOMEM;
+	}
+	memset((void*)runtime->control, 0, size);
+
+	init_waitqueue_head(&runtime->sleep);
+	atomic_set(&runtime->mmap_count, 0);
+	init_timer(&runtime->tick_timer);
+	runtime->tick_timer.function = snd_pcm_tick_timer_func;
+	runtime->tick_timer.data = (unsigned long) substream;
+
+	runtime->status->state = SNDRV_PCM_STATE_OPEN;
+
+	substream->runtime = runtime;
+	substream->private_data = pcm->private_data;
+	pstr->substream_opened++;
+	*rsubstream = substream;
+	return 0;
+}
+
+void snd_pcm_release_substream(snd_pcm_substream_t *substream)
+{
+	snd_pcm_runtime_t * runtime;
+	substream->file = NULL;
+	runtime = substream->runtime;
+	snd_assert(runtime != NULL, return);
+	if (runtime->private_free != NULL)
+		runtime->private_free(runtime);
+	snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)));
+	snd_free_pages((void*)runtime->control, PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t)));
+	kfree(runtime->hw_constraints.rules);
+	kfree(runtime);
+	substream->runtime = NULL;
+	substream->pstr->substream_opened--;
+}
+
+static int snd_pcm_dev_register(snd_device_t *device)
+{
+	int idx, cidx, err;
+	unsigned short minor;
+	snd_pcm_substream_t *substream;
+	struct list_head *list;
+	char str[16];
+	snd_pcm_t *pcm = device->device_data;
+
+	snd_assert(pcm != NULL && device != NULL, return -ENXIO);
+	down(&register_mutex);
+	idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
+	if (snd_pcm_devices[idx]) {
+		up(&register_mutex);
+		return -EBUSY;
+	}
+	snd_pcm_devices[idx] = pcm;
+	for (cidx = 0; cidx < 2; cidx++) {
+		int devtype = -1;
+		if (pcm->streams[cidx].substream == NULL)
+			continue;
+		switch (cidx) {
+		case SNDRV_PCM_STREAM_PLAYBACK:
+			sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
+			minor = SNDRV_MINOR_PCM_PLAYBACK + idx;
+			devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
+			break;
+		case SNDRV_PCM_STREAM_CAPTURE:
+			sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
+			minor = SNDRV_MINOR_PCM_CAPTURE + idx;
+			devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
+			break;
+		}
+		if ((err = snd_register_device(devtype, pcm->card, pcm->device, pcm->streams[cidx].reg, str)) < 0) {
+			snd_pcm_devices[idx] = NULL;
+			up(&register_mutex);
+			return err;
+		}
+		for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
+			snd_pcm_timer_init(substream);
+	}
+	list_for_each(list, &snd_pcm_notify_list) {
+		snd_pcm_notify_t *notify;
+		notify = list_entry(list, snd_pcm_notify_t, list);
+		notify->n_register(pcm);
+	}
+	up(&register_mutex);
+	return 0;
+}
+
+static int snd_pcm_dev_disconnect(snd_device_t *device)
+{
+	snd_pcm_t *pcm = device->device_data;
+	struct list_head *list;
+	snd_pcm_substream_t *substream;
+	int idx, cidx;
+
+	down(&register_mutex);
+	idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
+	snd_pcm_devices[idx] = NULL;
+	for (cidx = 0; cidx < 2; cidx++)
+		for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
+			if (substream->runtime)
+				substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
+	list_for_each(list, &snd_pcm_notify_list) {
+		snd_pcm_notify_t *notify;
+		notify = list_entry(list, snd_pcm_notify_t, list);
+		notify->n_disconnect(pcm);
+	}
+	up(&register_mutex);
+	return 0;
+}
+
+static int snd_pcm_dev_unregister(snd_device_t *device)
+{
+	int idx, cidx, devtype;
+	snd_pcm_substream_t *substream;
+	struct list_head *list;
+	snd_pcm_t *pcm = device->device_data;
+
+	snd_assert(pcm != NULL, return -ENXIO);
+	down(&register_mutex);
+	idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
+	snd_pcm_devices[idx] = NULL;
+	for (cidx = 0; cidx < 2; cidx++) {
+		devtype = -1;
+		switch (cidx) {
+		case SNDRV_PCM_STREAM_PLAYBACK:
+			devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
+			break;
+		case SNDRV_PCM_STREAM_CAPTURE:
+			devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
+			break;
+		}
+		snd_unregister_device(devtype, pcm->card, pcm->device);
+		for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
+			snd_pcm_timer_done(substream);
+	}
+	list_for_each(list, &snd_pcm_notify_list) {
+		snd_pcm_notify_t *notify;
+		notify = list_entry(list, snd_pcm_notify_t, list);
+		notify->n_unregister(pcm);
+	}
+	up(&register_mutex);
+	return snd_pcm_free(pcm);
+}
+
+int snd_pcm_notify(snd_pcm_notify_t *notify, int nfree)
+{
+	int idx;
+
+	snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL);
+	down(&register_mutex);
+	if (nfree) {
+		list_del(&notify->list);
+		for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
+			if (snd_pcm_devices[idx] == NULL)
+				continue;
+			notify->n_unregister(snd_pcm_devices[idx]);
+		}
+	} else {
+		list_add_tail(&notify->list, &snd_pcm_notify_list);
+		for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
+			if (snd_pcm_devices[idx] == NULL)
+				continue;
+			notify->n_register(snd_pcm_devices[idx]);
+		}
+	}
+	up(&register_mutex);
+	return 0;
+}
+
+/*
+ *  Info interface
+ */
+
+static void snd_pcm_proc_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
+{
+	int idx;
+	snd_pcm_t *pcm;
+
+	down(&register_mutex);
+	for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
+		pcm = snd_pcm_devices[idx];
+		if (pcm == NULL)
+			continue;
+		snd_iprintf(buffer, "%02i-%02i: %s : %s", idx / SNDRV_PCM_DEVICES,
+			    idx % SNDRV_PCM_DEVICES, pcm->id, pcm->name);
+		if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
+			snd_iprintf(buffer, " : playback %i", pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
+		if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
+			snd_iprintf(buffer, " : capture %i", pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
+		snd_iprintf(buffer, "\n");
+	}
+	up(&register_mutex);
+}
+
+/*
+ *  ENTRY functions
+ */
+
+static snd_info_entry_t *snd_pcm_proc_entry = NULL;
+
+static int __init alsa_pcm_init(void)
+{
+	snd_info_entry_t *entry;
+
+	snd_ctl_register_ioctl(snd_pcm_control_ioctl);
+	snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
+	if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
+		snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128, snd_pcm_proc_read);
+		if (snd_info_register(entry) < 0) {
+			snd_info_free_entry(entry);
+			entry = NULL;
+		}
+	}
+	snd_pcm_proc_entry = entry;
+	return 0;
+}
+
+static void __exit alsa_pcm_exit(void)
+{
+	snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
+	snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
+	if (snd_pcm_proc_entry) {
+		snd_info_unregister(snd_pcm_proc_entry);
+		snd_pcm_proc_entry = NULL;
+	}
+}
+
+module_init(alsa_pcm_init)
+module_exit(alsa_pcm_exit)
+
+EXPORT_SYMBOL(snd_pcm_devices);
+EXPORT_SYMBOL(snd_pcm_new);
+EXPORT_SYMBOL(snd_pcm_new_stream);
+EXPORT_SYMBOL(snd_pcm_notify);
+EXPORT_SYMBOL(snd_pcm_open_substream);
+EXPORT_SYMBOL(snd_pcm_release_substream);
+EXPORT_SYMBOL(snd_pcm_format_name);
+  /* pcm_native.c */
+EXPORT_SYMBOL(snd_pcm_link_rwlock);
+EXPORT_SYMBOL(snd_pcm_start);
+#ifdef CONFIG_PM
+EXPORT_SYMBOL(snd_pcm_suspend);
+EXPORT_SYMBOL(snd_pcm_suspend_all);
+#endif
+EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl);
+EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl);
+EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
+EXPORT_SYMBOL(snd_pcm_mmap_data);
+#if SNDRV_PCM_INFO_MMAP_IOMEM
+EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
+#endif
+ /* pcm_misc.c */
+EXPORT_SYMBOL(snd_pcm_format_signed);
+EXPORT_SYMBOL(snd_pcm_format_unsigned);
+EXPORT_SYMBOL(snd_pcm_format_linear);
+EXPORT_SYMBOL(snd_pcm_format_little_endian);
+EXPORT_SYMBOL(snd_pcm_format_big_endian);
+EXPORT_SYMBOL(snd_pcm_format_width);
+EXPORT_SYMBOL(snd_pcm_format_physical_width);
+EXPORT_SYMBOL(snd_pcm_format_silence_64);
+EXPORT_SYMBOL(snd_pcm_format_set_silence);
+EXPORT_SYMBOL(snd_pcm_build_linear_format);
+EXPORT_SYMBOL(snd_pcm_limit_hw_rates);