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!

18 files changed, 10925 insertions, 0 deletions

diff --git a/sound/usb/Kconfig b/sound/usb/Kconfig
new file mode 100644
index 00000000000..9329e992c84
--- /dev/null
+++ b/sound/usb/Kconfig
@@ -0,0 +1,32 @@
+# ALSA USB drivers
+
+menu "USB devices"
+	depends on SND!=n && USB!=n
+
+config SND_USB_AUDIO
+	tristate "USB Audio/MIDI driver"
+	depends on SND && USB
+	select SND_RAWMIDI
+	select SND_PCM
+	help
+	  Say Y here to include support for USB audio and USB MIDI
+	  devices.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called snd-usb-audio.
+
+config SND_USB_USX2Y
+	tristate "Tascam US-122, US-224 and US-428 USB driver"
+	depends on SND && USB && (X86 || PPC || ALPHA)
+	select SND_HWDEP
+	select SND_RAWMIDI
+	select SND_PCM
+	help
+	  Say Y here to include support for Tascam USB Audio/MIDI
+	  interfaces or controllers US-122, US-224 and US-428.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called snd-usb-usx2y.
+
+endmenu
+
diff --git a/sound/usb/Makefile b/sound/usb/Makefile
new file mode 100644
index 00000000000..2c1dc11a72e
--- /dev/null
+++ b/sound/usb/Makefile
@@ -0,0 +1,12 @@
+#
+# Makefile for ALSA
+#
+
+snd-usb-audio-objs := usbaudio.o usbmixer.o
+snd-usb-lib-objs := usbmidi.o
+
+# Toplevel Module Dependency
+obj-$(CONFIG_SND_USB_AUDIO) += snd-usb-audio.o snd-usb-lib.o
+obj-$(CONFIG_SND_USB_USX2Y) += snd-usb-lib.o
+
+obj-$(CONFIG_SND) += usx2y/
diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
new file mode 100644
index 00000000000..84b0bbddbd2
--- /dev/null
+++ b/sound/usb/usbaudio.c
@@ -0,0 +1,3337 @@
+/*
+ *   (Tentative) USB Audio Driver for ALSA
+ *
+ *   Main and PCM part
+ *
+ *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
+ *
+ *   Many codes borrowed from audio.c by
+ *	    Alan Cox (alan@lxorguk.ukuu.org.uk)
+ *	    Thomas Sailer (sailer@ife.ee.ethz.ch)
+ *
+ *
+ *   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
+ *
+ *
+ *  NOTES:
+ *
+ *   - async unlink should be used for avoiding the sleep inside lock.
+ *     2.4.22 usb-uhci seems buggy for async unlinking and results in
+ *     oops.  in such a cse, pass async_unlink=0 option.
+ *   - the linked URBs would be preferred but not used so far because of
+ *     the instability of unlinking.
+ *   - type II is not supported properly.  there is no device which supports
+ *     this type *correctly*.  SB extigy looks as if it supports, but it's
+ *     indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream).
+ */
+
+
+#include <sound/driver.h>
+#include <linux/bitops.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/usb.h>
+#include <linux/moduleparam.h>
+#include <sound/core.h>
+#include <sound/info.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/initval.h>
+
+#include "usbaudio.h"
+
+
+MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
+MODULE_DESCRIPTION("USB Audio");
+MODULE_LICENSE("GPL");
+MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
+
+
+static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;	/* Index 0-MAX */
+static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;	/* ID for this card */
+static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;	/* Enable this card */
+static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; /* Vendor ID for this card */
+static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; /* Product ID for this card */
+static int nrpacks = 4;		/* max. number of packets per urb */
+static int async_unlink = 1;
+
+module_param_array(index, int, NULL, 0444);
+MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
+module_param_array(id, charp, NULL, 0444);
+MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
+module_param_array(enable, bool, NULL, 0444);
+MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
+module_param_array(vid, int, NULL, 0444);
+MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
+module_param_array(pid, int, NULL, 0444);
+MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
+module_param(nrpacks, int, 0444);
+MODULE_PARM_DESC(nrpacks, "Max. number of packets per URB.");
+module_param(async_unlink, bool, 0444);
+MODULE_PARM_DESC(async_unlink, "Use async unlink mode.");
+
+
+/*
+ * debug the h/w constraints
+ */
+/* #define HW_CONST_DEBUG */
+
+
+/*
+ *
+ */
+
+#define MAX_PACKS	10
+#define MAX_PACKS_HS	(MAX_PACKS * 8)	/* in high speed mode */
+#define MAX_URBS	5	/* max. 20ms long packets */
+#define SYNC_URBS	2	/* always two urbs for sync */
+#define MIN_PACKS_URB	1	/* minimum 1 packet per urb */
+
+typedef struct snd_usb_substream snd_usb_substream_t;
+typedef struct snd_usb_stream snd_usb_stream_t;
+typedef struct snd_urb_ctx snd_urb_ctx_t;
+
+struct audioformat {
+	struct list_head list;
+	snd_pcm_format_t format;	/* format type */
+	unsigned int channels;		/* # channels */
+	unsigned int fmt_type;		/* USB audio format type (1-3) */
+	unsigned int frame_size;	/* samples per frame for non-audio */
+	int iface;			/* interface number */
+	unsigned char altsetting;	/* corresponding alternate setting */
+	unsigned char altset_idx;	/* array index of altenate setting */
+	unsigned char attributes;	/* corresponding attributes of cs endpoint */
+	unsigned char endpoint;		/* endpoint */
+	unsigned char ep_attr;		/* endpoint attributes */
+	unsigned int maxpacksize;	/* max. packet size */
+	unsigned int rates;		/* rate bitmasks */
+	unsigned int rate_min, rate_max;	/* min/max rates */
+	unsigned int nr_rates;		/* number of rate table entries */
+	unsigned int *rate_table;	/* rate table */
+};
+
+struct snd_urb_ctx {
+	struct urb *urb;
+	snd_usb_substream_t *subs;
+	int index;	/* index for urb array */
+	int packets;	/* number of packets per urb */
+	int transfer;	/* transferred size */
+	char *buf;	/* buffer for capture */
+};
+
+struct snd_urb_ops {
+	int (*prepare)(snd_usb_substream_t *subs, snd_pcm_runtime_t *runtime, struct urb *u);
+	int (*retire)(snd_usb_substream_t *subs, snd_pcm_runtime_t *runtime, struct urb *u);
+	int (*prepare_sync)(snd_usb_substream_t *subs, snd_pcm_runtime_t *runtime, struct urb *u);
+	int (*retire_sync)(snd_usb_substream_t *subs, snd_pcm_runtime_t *runtime, struct urb *u);
+};
+
+struct snd_usb_substream {
+	snd_usb_stream_t *stream;
+	struct usb_device *dev;
+	snd_pcm_substream_t *pcm_substream;
+	int direction;	/* playback or capture */
+	int interface;	/* current interface */
+	int endpoint;	/* assigned endpoint */
+	struct audioformat *cur_audiofmt;	/* current audioformat pointer (for hw_params callback) */
+	unsigned int cur_rate;		/* current rate (for hw_params callback) */
+	unsigned int period_bytes;	/* current period bytes (for hw_params callback) */
+	unsigned int format;     /* USB data format */
+	unsigned int datapipe;   /* the data i/o pipe */
+	unsigned int syncpipe;   /* 1 - async out or adaptive in */
+	unsigned int syncinterval;  /* P for adaptive mode, 0 otherwise */
+	unsigned int freqn;      /* nominal sampling rate in fs/fps in Q16.16 format */
+	unsigned int freqm;      /* momentary sampling rate in fs/fps in Q16.16 format */
+	unsigned int freqmax;    /* maximum sampling rate, used for buffer management */
+	unsigned int phase;      /* phase accumulator */
+	unsigned int maxpacksize;	/* max packet size in bytes */
+	unsigned int maxframesize;	/* max packet size in frames */
+	unsigned int curpacksize;	/* current packet size in bytes (for capture) */
+	unsigned int curframesize;	/* current packet size in frames (for capture) */
+	unsigned int fill_max: 1;	/* fill max packet size always */
+	unsigned int fmt_type;		/* USB audio format type (1-3) */
+
+	unsigned int running: 1;	/* running status */
+
+	unsigned int hwptr;			/* free frame position in the buffer (only for playback) */
+	unsigned int hwptr_done;			/* processed frame position in the buffer */
+	unsigned int transfer_sched;		/* scheduled frames since last period (for playback) */
+	unsigned int transfer_done;		/* processed frames since last period update */
+	unsigned long active_mask;	/* bitmask of active urbs */
+	unsigned long unlink_mask;	/* bitmask of unlinked urbs */
+
+	unsigned int nurbs;			/* # urbs */
+	snd_urb_ctx_t dataurb[MAX_URBS];	/* data urb table */
+	snd_urb_ctx_t syncurb[SYNC_URBS];	/* sync urb table */
+	char syncbuf[SYNC_URBS * MAX_PACKS * 4]; /* sync buffer; it's so small - let's get static */
+	char *tmpbuf;			/* temporary buffer for playback */
+
+	u64 formats;			/* format bitmasks (all or'ed) */
+	unsigned int num_formats;		/* number of supported audio formats (list) */
+	struct list_head fmt_list;	/* format list */
+	spinlock_t lock;
+
+	struct snd_urb_ops ops;		/* callbacks (must be filled at init) */
+};
+
+
+struct snd_usb_stream {
+	snd_usb_audio_t *chip;
+	snd_pcm_t *pcm;
+	int pcm_index;
+	unsigned int fmt_type;		/* USB audio format type (1-3) */
+	snd_usb_substream_t substream[2];
+	struct list_head list;
+};
+
+
+/*
+ * we keep the snd_usb_audio_t instances by ourselves for merging
+ * the all interfaces on the same card as one sound device.
+ */
+
+static DECLARE_MUTEX(register_mutex);
+static snd_usb_audio_t *usb_chip[SNDRV_CARDS];
+
+
+/*
+ * convert a sampling rate into our full speed format (fs/1000 in Q16.16)
+ * this will overflow at approx 524 kHz
+ */
+inline static unsigned get_usb_full_speed_rate(unsigned int rate)
+{
+	return ((rate << 13) + 62) / 125;
+}
+
+/*
+ * convert a sampling rate into USB high speed format (fs/8000 in Q16.16)
+ * this will overflow at approx 4 MHz
+ */
+inline static unsigned get_usb_high_speed_rate(unsigned int rate)
+{
+	return ((rate << 10) + 62) / 125;
+}
+
+/* convert our full speed USB rate into sampling rate in Hz */
+inline static unsigned get_full_speed_hz(unsigned int usb_rate)
+{
+	return (usb_rate * 125 + (1 << 12)) >> 13;
+}
+
+/* convert our high speed USB rate into sampling rate in Hz */
+inline static unsigned get_high_speed_hz(unsigned int usb_rate)
+{
+	return (usb_rate * 125 + (1 << 9)) >> 10;
+}
+
+
+/*
+ * prepare urb for full speed capture sync pipe
+ *
+ * fill the length and offset of each urb descriptor.
+ * the fixed 10.14 frequency is passed through the pipe.
+ */
+static int prepare_capture_sync_urb(snd_usb_substream_t *subs,
+				    snd_pcm_runtime_t *runtime,
+				    struct urb *urb)
+{
+	unsigned char *cp = urb->transfer_buffer;
+	snd_urb_ctx_t *ctx = (snd_urb_ctx_t *)urb->context;
+	int i, offs;
+
+	urb->number_of_packets = ctx->packets;
+	urb->dev = ctx->subs->dev; /* we need to set this at each time */
+	for (i = offs = 0; i < urb->number_of_packets; i++, offs += 4, cp += 4) {
+		urb->iso_frame_desc[i].length = 3;
+		urb->iso_frame_desc[i].offset = offs;
+		cp[0] = subs->freqn >> 2;
+		cp[1] = subs->freqn >> 10;
+		cp[2] = subs->freqn >> 18;
+	}
+	return 0;
+}
+
+/*
+ * prepare urb for high speed capture sync pipe
+ *
+ * fill the length and offset of each urb descriptor.
+ * the fixed 12.13 frequency is passed as 16.16 through the pipe.
+ */
+static int prepare_capture_sync_urb_hs(snd_usb_substream_t *subs,
+				       snd_pcm_runtime_t *runtime,
+				       struct urb *urb)
+{
+	unsigned char *cp = urb->transfer_buffer;
+	snd_urb_ctx_t *ctx = (snd_urb_ctx_t *)urb->context;
+	int i, offs;
+
+	urb->number_of_packets = ctx->packets;
+	urb->dev = ctx->subs->dev; /* we need to set this at each time */
+	for (i = offs = 0; i < urb->number_of_packets; i++, offs += 4, cp += 4) {
+		urb->iso_frame_desc[i].length = 4;
+		urb->iso_frame_desc[i].offset = offs;
+		cp[0] = subs->freqn;
+		cp[1] = subs->freqn >> 8;
+		cp[2] = subs->freqn >> 16;
+		cp[3] = subs->freqn >> 24;
+	}
+	return 0;
+}
+
+/*
+ * process after capture sync complete
+ * - nothing to do
+ */
+static int retire_capture_sync_urb(snd_usb_substream_t *subs,
+				   snd_pcm_runtime_t *runtime,
+				   struct urb *urb)
+{
+	return 0;
+}
+
+/*
+ * prepare urb for capture data pipe
+ *
+ * fill the offset and length of each descriptor.
+ *
+ * we use a temporary buffer to write the captured data.
+ * since the length of written data is determined by host, we cannot
+ * write onto the pcm buffer directly...  the data is thus copied
+ * later at complete callback to the global buffer.
+ */
+static int prepare_capture_urb(snd_usb_substream_t *subs,
+			       snd_pcm_runtime_t *runtime,
+			       struct urb *urb)
+{
+	int i, offs;
+	unsigned long flags;
+	snd_urb_ctx_t *ctx = (snd_urb_ctx_t *)urb->context;
+
+	offs = 0;
+	urb->dev = ctx->subs->dev; /* we need to set this at each time */
+	urb->number_of_packets = 0;
+	spin_lock_irqsave(&subs->lock, flags);
+	for (i = 0; i < ctx->packets; i++) {
+		urb->iso_frame_desc[i].offset = offs;
+		urb->iso_frame_desc[i].length = subs->curpacksize;
+		offs += subs->curpacksize;
+		urb->number_of_packets++;
+		subs->transfer_sched += subs->curframesize;
+		if (subs->transfer_sched >= runtime->period_size) {
+			subs->transfer_sched -= runtime->period_size;
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&subs->lock, flags);
+	urb->transfer_buffer = ctx->buf;
+	urb->transfer_buffer_length = offs;
+#if 0 // for check
+	if (! urb->bandwidth) {
+		int bustime;
+		bustime = usb_check_bandwidth(urb->dev, urb);
+		if (bustime < 0)
+			return bustime;
+		printk("urb %d: bandwidth = %d (packets = %d)\n", ctx->index, bustime, urb->number_of_packets);
+		usb_claim_bandwidth(urb->dev, urb, bustime, 1);
+	}
+#endif // for check
+	return 0;
+}
+
+/*
+ * process after capture complete
+ *
+ * copy the data from each desctiptor to the pcm buffer, and
+ * update the current position.
+ */
+static int retire_capture_urb(snd_usb_substream_t *subs,
+			      snd_pcm_runtime_t *runtime,
+			      struct urb *urb)
+{
+	unsigned long flags;
+	unsigned char *cp;
+	int i;
+	unsigned int stride, len, oldptr;
+
+	stride = runtime->frame_bits >> 3;
+
+	for (i = 0; i < urb->number_of_packets; i++) {
+		cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
+		if (urb->iso_frame_desc[i].status) {
+			snd_printd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
+			// continue;
+		}
+		len = urb->iso_frame_desc[i].actual_length / stride;
+		if (! len)
+			continue;
+		/* update the current pointer */
+		spin_lock_irqsave(&subs->lock, flags);
+		oldptr = subs->hwptr_done;
+		subs->hwptr_done += len;
+		if (subs->hwptr_done >= runtime->buffer_size)
+			subs->hwptr_done -= runtime->buffer_size;
+		subs->transfer_done += len;
+		spin_unlock_irqrestore(&subs->lock, flags);
+		/* copy a data chunk */
+		if (oldptr + len > runtime->buffer_size) {
+			unsigned int cnt = runtime->buffer_size - oldptr;
+			unsigned int blen = cnt * stride;
+			memcpy(runtime->dma_area + oldptr * stride, cp, blen);
+			memcpy(runtime->dma_area, cp + blen, len * stride - blen);
+		} else {
+			memcpy(runtime->dma_area + oldptr * stride, cp, len * stride);
+		}
+		/* update the pointer, call callback if necessary */
+		spin_lock_irqsave(&subs->lock, flags);
+		if (subs->transfer_done >= runtime->period_size) {
+			subs->transfer_done -= runtime->period_size;
+			spin_unlock_irqrestore(&subs->lock, flags);
+			snd_pcm_period_elapsed(subs->pcm_substream);
+		} else
+			spin_unlock_irqrestore(&subs->lock, flags);
+	}
+	return 0;
+}
+
+
+/*
+ * prepare urb for full speed playback sync pipe
+ *
+ * set up the offset and length to receive the current frequency.
+ */
+
+static int prepare_playback_sync_urb(snd_usb_substream_t *subs,
+				     snd_pcm_runtime_t *runtime,
+				     struct urb *urb)
+{
+	int i, offs;
+	snd_urb_ctx_t *ctx = (snd_urb_ctx_t *)urb->context;
+
+	urb->number_of_packets = ctx->packets;
+	urb->dev = ctx->subs->dev; /* we need to set this at each time */
+	for (i = offs = 0; i < urb->number_of_packets; i++, offs += 4) {
+		urb->iso_frame_desc[i].length = 3;
+		urb->iso_frame_desc[i].offset = offs;
+	}
+	return 0;
+}
+
+/*
+ * prepare urb for high speed playback sync pipe
+ *
+ * set up the offset and length to receive the current frequency.
+ */
+
+static int prepare_playback_sync_urb_hs(snd_usb_substream_t *subs,
+					snd_pcm_runtime_t *runtime,
+					struct urb *urb)
+{
+	int i, offs;
+	snd_urb_ctx_t *ctx = (snd_urb_ctx_t *)urb->context;
+
+	urb->number_of_packets = ctx->packets;
+	urb->dev = ctx->subs->dev; /* we need to set this at each time */
+	for (i = offs = 0; i < urb->number_of_packets; i++, offs += 4) {
+		urb->iso_frame_desc[i].length = 4;
+		urb->iso_frame_desc[i].offset = offs;
+	}
+	return 0;
+}
+
+/*
+ * process after full speed playback sync complete
+ *
+ * retrieve the current 10.14 frequency from pipe, and set it.
+ * the value is referred in prepare_playback_urb().
+ */
+static int retire_playback_sync_urb(snd_usb_substream_t *subs,
+				    snd_pcm_runtime_t *runtime,
+				    struct urb *urb)
+{
+	int i;
+	unsigned int f, found;
+	unsigned char *cp = urb->transfer_buffer;
+	unsigned long flags;
+
+	found = 0;
+	for (i = 0; i < urb->number_of_packets; i++, cp += 4) {
+		if (urb->iso_frame_desc[i].status ||
+		    urb->iso_frame_desc[i].actual_length < 3)
+			continue;
+		f = combine_triple(cp) << 2;
+#if 0
+		if (f < subs->freqn - (subs->freqn>>3) || f > subs->freqmax) {
+			snd_printd(KERN_WARNING "requested frequency %d (%u,%03uHz) out of range (current nominal %d (%u,%03uHz))\n",
+				   f, f >> 14, (f & ((1 << 14) - 1) * 1000) / ((1 << 14) - 1),
+				   subs->freqn, subs->freqn >> 14, (subs->freqn & ((1 << 14) - 1) * 1000) / ((1 << 14) - 1));
+			continue;
+		}
+#endif
+		found = f;
+	}
+	if (found) {
+		spin_lock_irqsave(&subs->lock, flags);
+		subs->freqm = found;
+		spin_unlock_irqrestore(&subs->lock, flags);
+	}
+
+	return 0;
+}
+
+/*
+ * process after high speed playback sync complete
+ *
+ * retrieve the current 12.13 frequency from pipe, and set it.
+ * the value is referred in prepare_playback_urb().
+ */
+static int retire_playback_sync_urb_hs(snd_usb_substream_t *subs,
+				       snd_pcm_runtime_t *runtime,
+				       struct urb *urb)
+{
+	int i;
+	unsigned int found;
+	unsigned char *cp = urb->transfer_buffer;
+	unsigned long flags;
+
+	found = 0;
+	for (i = 0; i < urb->number_of_packets; i++, cp += 4) {
+		if (urb->iso_frame_desc[i].status ||
+		    urb->iso_frame_desc[i].actual_length < 4)
+			continue;
+		found = combine_quad(cp) & 0x0fffffff;
+	}
+	if (found) {
+		spin_lock_irqsave(&subs->lock, flags);
+		subs->freqm = found;
+		spin_unlock_irqrestore(&subs->lock, flags);
+	}
+
+	return 0;
+}
+
+/*
+ * prepare urb for playback data pipe
+ *
+ * we copy the data directly from the pcm buffer.
+ * the current position to be copied is held in hwptr field.
+ * since a urb can handle only a single linear buffer, if the total
+ * transferred area overflows the buffer boundary, we cannot send
+ * it directly from the buffer.  thus the data is once copied to
+ * a temporary buffer and urb points to that.
+ */
+static int prepare_playback_urb(snd_usb_substream_t *subs,
+				snd_pcm_runtime_t *runtime,
+				struct urb *urb)
+{
+	int i, stride, offs;
+	unsigned int counts;
+	unsigned long flags;
+	snd_urb_ctx_t *ctx = (snd_urb_ctx_t *)urb->context;
+
+	stride = runtime->frame_bits >> 3;
+
+	offs = 0;
+	urb->dev = ctx->subs->dev; /* we need to set this at each time */
+	urb->number_of_packets = 0;
+	spin_lock_irqsave(&subs->lock, flags);
+	for (i = 0; i < ctx->packets; i++) {
+		/* calculate the size of a packet */
+		if (subs->fill_max)
+			counts = subs->maxframesize; /* fixed */
+		else {
+			subs->phase = (subs->phase & 0xffff) + subs->freqm;
+			counts = subs->phase >> 16;
+			if (counts > subs->maxframesize)
+				counts = subs->maxframesize;
+		}
+		/* set up descriptor */
+		urb->iso_frame_desc[i].offset = offs * stride;
+		urb->iso_frame_desc[i].length = counts * stride;
+		offs += counts;
+		urb->number_of_packets++;
+		subs->transfer_sched += counts;
+		if (subs->transfer_sched >= runtime->period_size) {
+			subs->transfer_sched -= runtime->period_size;
+			if (subs->fmt_type == USB_FORMAT_TYPE_II) {
+				if (subs->transfer_sched > 0) {
+					/* FIXME: fill-max mode is not supported yet */
+					offs -= subs->transfer_sched;
+					counts -= subs->transfer_sched;
+					urb->iso_frame_desc[i].length = counts * stride;
+					subs->transfer_sched = 0;
+				}
+				i++;
+				if (i < ctx->packets) {
+					/* add a transfer delimiter */
+					urb->iso_frame_desc[i].offset = offs * stride;
+					urb->iso_frame_desc[i].length = 0;
+					urb->number_of_packets++;
+				}
+			}
+			break;
+ 		}
+	}
+	if (subs->hwptr + offs > runtime->buffer_size) {
+		/* err, the transferred area goes over buffer boundary.
+		 * copy the data to the temp buffer.
+		 */
+		int len;
+		len = runtime->buffer_size - subs->hwptr;
+		urb->transfer_buffer = subs->tmpbuf;
+		memcpy(subs->tmpbuf, runtime->dma_area + subs->hwptr * stride, len * stride);
+		memcpy(subs->tmpbuf + len * stride, runtime->dma_area, (offs - len) * stride);
+		subs->hwptr += offs;
+		subs->hwptr -= runtime->buffer_size;
+	} else {
+		/* set the buffer pointer */
+		urb->transfer_buffer = runtime->dma_area + subs->hwptr * stride;
+		subs->hwptr += offs;
+	}
+	spin_unlock_irqrestore(&subs->lock, flags);
+	urb->transfer_buffer_length = offs * stride;
+	ctx->transfer = offs;
+
+	return 0;
+}
+
+/*
+ * process after playback data complete
+ *
+ * update the current position and call callback if a period is processed.
+ */
+static int retire_playback_urb(snd_usb_substream_t *subs,
+			       snd_pcm_runtime_t *runtime,
+			       struct urb *urb)
+{
+	unsigned long flags;
+	snd_urb_ctx_t *ctx = (snd_urb_ctx_t *)urb->context;
+
+	spin_lock_irqsave(&subs->lock, flags);
+	subs->transfer_done += ctx->transfer;
+	subs->hwptr_done += ctx->transfer;
+	ctx->transfer = 0;
+	if (subs->hwptr_done >= runtime->buffer_size)
+		subs->hwptr_done -= runtime->buffer_size;
+	if (subs->transfer_done >= runtime->period_size) {
+		subs->transfer_done -= runtime->period_size;
+		spin_unlock_irqrestore(&subs->lock, flags);
+		snd_pcm_period_elapsed(subs->pcm_substream);
+	} else
+		spin_unlock_irqrestore(&subs->lock, flags);
+	return 0;
+}
+
+
+/*
+ */
+static struct snd_urb_ops audio_urb_ops[2] = {
+	{
+		.prepare =	prepare_playback_urb,
+		.retire =	retire_playback_urb,
+		.prepare_sync =	prepare_playback_sync_urb,
+		.retire_sync =	retire_playback_sync_urb,
+	},
+	{
+		.prepare =	prepare_capture_urb,
+		.retire =	retire_capture_urb,
+		.prepare_sync =	prepare_capture_sync_urb,
+		.retire_sync =	retire_capture_sync_urb,
+	},
+};
+
+static struct snd_urb_ops audio_urb_ops_high_speed[2] = {
+	{
+		.prepare =	prepare_playback_urb,
+		.retire =	retire_playback_urb,
+		.prepare_sync =	prepare_playback_sync_urb_hs,
+		.retire_sync =	retire_playback_sync_urb_hs,
+	},
+	{
+		.prepare =	prepare_capture_urb,
+		.retire =	retire_capture_urb,
+		.prepare_sync =	prepare_capture_sync_urb_hs,
+		.retire_sync =	retire_capture_sync_urb,
+	},
+};
+
+/*
+ * complete callback from data urb
+ */
+static void snd_complete_urb(struct urb *urb, struct pt_regs *regs)
+{
+	snd_urb_ctx_t *ctx = (snd_urb_ctx_t *)urb->context;
+	snd_usb_substream_t *subs = ctx->subs;
+	snd_pcm_substream_t *substream = ctx->subs->pcm_substream;
+	int err = 0;
+
+	if ((subs->running && subs->ops.retire(subs, substream->runtime, urb)) ||
+	    ! subs->running || /* can be stopped during retire callback */
+	    (err = subs->ops.prepare(subs, substream->runtime, urb)) < 0 ||
+	    (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
+		clear_bit(ctx->index, &subs->active_mask);
+		if (err < 0) {
+			snd_printd(KERN_ERR "cannot submit urb (err = %d)\n", err);
+			snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
+		}
+	}
+}
+
+
+/*
+ * complete callback from sync urb
+ */
+static void snd_complete_sync_urb(struct urb *urb, struct pt_regs *regs)
+{
+	snd_urb_ctx_t *ctx = (snd_urb_ctx_t *)urb->context;
+	snd_usb_substream_t *subs = ctx->subs;
+	snd_pcm_substream_t *substream = ctx->subs->pcm_substream;
+	int err = 0;
+
+	if ((subs->running && subs->ops.retire_sync(subs, substream->runtime, urb)) ||
+	    ! subs->running || /* can be stopped during retire callback */
+	    (err = subs->ops.prepare_sync(subs, substream->runtime, urb)) < 0 ||
+	    (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
+		clear_bit(ctx->index + 16, &subs->active_mask);
+		if (err < 0) {
+			snd_printd(KERN_ERR "cannot submit sync urb (err = %d)\n", err);
+			snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
+		}
+	}
+}
+
+
+/*
+ * unlink active urbs.
+ */
+static int deactivate_urbs(snd_usb_substream_t *subs, int force, int can_sleep)
+{
+	unsigned int i;
+	int async;
+
+	subs->running = 0;
+
+	if (!force && subs->stream->chip->shutdown) /* to be sure... */
+		return -EBADFD;
+
+	async = !can_sleep && async_unlink;
+
+	if (! async && in_interrupt())
+		return 0;
+
+	for (i = 0; i < subs->nurbs; i++) {
+		if (test_bit(i, &subs->active_mask)) {
+			if (! test_and_set_bit(i, &subs->unlink_mask)) {
+				struct urb *u = subs->dataurb[i].urb;
+				if (async) {
+					u->transfer_flags |= URB_ASYNC_UNLINK;
+					usb_unlink_urb(u);
+				} else
+					usb_kill_urb(u);
+			}
+		}
+	}
+	if (subs->syncpipe) {
+		for (i = 0; i < SYNC_URBS; i++) {
+			if (test_bit(i+16, &subs->active_mask)) {
+ 				if (! test_and_set_bit(i+16, &subs->unlink_mask)) {
+					struct urb *u = subs->syncurb[i].urb;
+					if (async) {
+						u->transfer_flags |= URB_ASYNC_UNLINK;
+						usb_unlink_urb(u);
+					} else
+						usb_kill_urb(u);
+				}
+			}
+		}
+	}
+	return 0;
+}
+
+
+/*
+ * set up and start data/sync urbs
+ */
+static int start_urbs(snd_usb_substream_t *subs, snd_pcm_runtime_t *runtime)
+{
+	unsigned int i;
+	int err;
+
+	if (subs->stream->chip->shutdown)
+		return -EBADFD;
+
+	for (i = 0; i < subs->nurbs; i++) {
+		snd_assert(subs->dataurb[i].urb, return -EINVAL);
+		if (subs->ops.prepare(subs, runtime, subs->dataurb[i].urb) < 0) {
+			snd_printk(KERN_ERR "cannot prepare datapipe for urb %d\n", i);
+			goto __error;
+		}
+	}
+	if (subs->syncpipe) {
+		for (i = 0; i < SYNC_URBS; i++) {
+			snd_assert(subs->syncurb[i].urb, return -EINVAL);
+			if (subs->ops.prepare_sync(subs, runtime, subs->syncurb[i].urb) < 0) {
+				snd_printk(KERN_ERR "cannot prepare syncpipe for urb %d\n", i);
+				goto __error;
+			}
+		}
+	}
+
+	subs->active_mask = 0;
+	subs->unlink_mask = 0;
+	subs->running = 1;
+	for (i = 0; i < subs->nurbs; i++) {
+		if ((err = usb_submit_urb(subs->dataurb[i].urb, GFP_ATOMIC)) < 0) {
+			snd_printk(KERN_ERR "cannot submit datapipe for urb %d, err = %d\n", i, err);
+			goto __error;
+		}
+		set_bit(i, &subs->active_mask);
+	}
+	if (subs->syncpipe) {
+		for (i = 0; i < SYNC_URBS; i++) {
+			if ((err = usb_submit_urb(subs->syncurb[i].urb, GFP_ATOMIC)) < 0) {
+				snd_printk(KERN_ERR "cannot submit syncpipe for urb %d, err = %d\n", i, err);
+				goto __error;
+			}
+			set_bit(i + 16, &subs->active_mask);
+		}
+	}
+	return 0;
+
+ __error:
+	// snd_pcm_stop(subs->pcm_substream, SNDRV_PCM_STATE_XRUN);
+	deactivate_urbs(subs, 0, 0);
+	return -EPIPE;
+}
+
+
+/*
+ *  wait until all urbs are processed.
+ */
+static int wait_clear_urbs(snd_usb_substream_t *subs)
+{
+	int timeout = HZ;
+	unsigned int i;
+	int alive;
+
+	do {
+		alive = 0;
+		for (i = 0; i < subs->nurbs; i++) {
+			if (test_bit(i, &subs->active_mask))
+				alive++;
+		}
+		if (subs->syncpipe) {
+			for (i = 0; i < SYNC_URBS; i++) {
+				if (test_bit(i + 16, &subs->active_mask))
+					alive++;
+			}
+		}
+		if (! alive)
+			break;
+		set_current_state(TASK_UNINTERRUPTIBLE);
+		schedule_timeout(1);
+	} while (--timeout > 0);
+	if (alive)
+		snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
+	return 0;
+}
+
+
+/*
+ * return the current pcm pointer.  just return the hwptr_done value.
+ */
+static snd_pcm_uframes_t snd_usb_pcm_pointer(snd_pcm_substream_t *substream)
+{
+	snd_usb_substream_t *subs = (snd_usb_substream_t *)substream->runtime->private_data;
+	return subs->hwptr_done;
+}
+
+
+/*
+ * start/stop substream
+ */
+static int snd_usb_pcm_trigger(snd_pcm_substream_t *substream, int cmd)
+{
+	snd_usb_substream_t *subs = (snd_usb_substream_t *)substream->runtime->private_data;
+	int err;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		err = start_urbs(subs, substream->runtime);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+		err = deactivate_urbs(subs, 0, 0);
+		break;
+	default:
+		err = -EINVAL;
+		break;
+	}
+	return err < 0 ? err : 0;
+}
+
+
+/*
+ * release a urb data
+ */
+static void release_urb_ctx(snd_urb_ctx_t *u)
+{
+	if (u->urb) {
+		usb_free_urb(u->urb);
+		u->urb = NULL;
+	}
+	if (u->buf) {
+		kfree(u->buf);
+		u->buf = NULL;
+	}
+}
+
+/*
+ * release a substream
+ */<