Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1033 insertions, 0 deletions

diff --git a/sound/usb/usx2y/usbusx2yaudio.c b/sound/usb/usx2y/usbusx2yaudio.c
new file mode 100644
index 000000000..5197599e7
--- /dev/null
+++ b/sound/usb/usx2y/usbusx2yaudio.c
@@ -0,0 +1,1033 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *   US-X2Y AUDIO
+ *   Copyright (c) 2002-2004 by Karsten Wiese
+ *
+ *   based on
+ *
+ *   (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)
+ */
+
+
+#include <linux/interrupt.h>
+#include <linux/slab.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 "usx2y.h"
+#include "usbusx2y.h"
+
+/* Default value used for nr of packs per urb.
+ * 1 to 4 have been tested ok on uhci.
+ * To use 3 on ohci, you'd need a patch:
+ * look for "0000425-linux-2.6.9-rc4-mm1_ohci-hcd.patch.gz" on
+ * "https://bugtrack.alsa-project.org/alsa-bug/bug_view_page.php?bug_id=0000425"
+ *
+ * 1, 2 and 4 work out of the box on ohci, if I recall correctly.
+ * Bigger is safer operation, smaller gives lower latencies.
+ */
+#define USX2Y_NRPACKS 4
+
+/* If your system works ok with this module's parameter
+ * nrpacks set to 1, you might as well comment
+ * this define out, and thereby produce smaller, faster code.
+ * You'd also set USX2Y_NRPACKS to 1 then.
+ */
+#define USX2Y_NRPACKS_VARIABLE 1
+
+#ifdef USX2Y_NRPACKS_VARIABLE
+static int nrpacks = USX2Y_NRPACKS; /* number of packets per urb */
+#define  nr_of_packs() nrpacks
+module_param(nrpacks, int, 0444);
+MODULE_PARM_DESC(nrpacks, "Number of packets per URB.");
+#else
+#define nr_of_packs() USX2Y_NRPACKS
+#endif
+
+static int usx2y_urb_capt_retire(struct snd_usx2y_substream *subs)
+{
+	struct urb	*urb = subs->completed_urb;
+	struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
+	unsigned char	*cp;
+	int		i, len, lens = 0, hwptr_done = subs->hwptr_done;
+	int		cnt, blen;
+	struct usx2ydev	*usx2y = subs->usx2y;
+
+	for (i = 0; i < nr_of_packs(); i++) {
+		cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
+		if (urb->iso_frame_desc[i].status) { /* active? hmm, skip this */
+			snd_printk(KERN_ERR
+				   "active frame status %i. Most probably some hardware problem.\n",
+				   urb->iso_frame_desc[i].status);
+			return urb->iso_frame_desc[i].status;
+		}
+		len = urb->iso_frame_desc[i].actual_length / usx2y->stride;
+		if (!len) {
+			snd_printd("0 == len ERROR!\n");
+			continue;
+		}
+
+		/* copy a data chunk */
+		if ((hwptr_done + len) > runtime->buffer_size) {
+			cnt = runtime->buffer_size - hwptr_done;
+			blen = cnt * usx2y->stride;
+			memcpy(runtime->dma_area + hwptr_done * usx2y->stride, cp, blen);
+			memcpy(runtime->dma_area, cp + blen, len * usx2y->stride - blen);
+		} else {
+			memcpy(runtime->dma_area + hwptr_done * usx2y->stride, cp,
+			       len * usx2y->stride);
+		}
+		lens += len;
+		hwptr_done += len;
+		if (hwptr_done >= runtime->buffer_size)
+			hwptr_done -= runtime->buffer_size;
+	}
+
+	subs->hwptr_done = hwptr_done;
+	subs->transfer_done += lens;
+	/* update the pointer, call callback if necessary */
+	if (subs->transfer_done >= runtime->period_size) {
+		subs->transfer_done -= runtime->period_size;
+		snd_pcm_period_elapsed(subs->pcm_substream);
+	}
+	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 usx2y_urb_play_prepare(struct snd_usx2y_substream *subs,
+				  struct urb *cap_urb,
+				  struct urb *urb)
+{
+	struct usx2ydev *usx2y = subs->usx2y;
+	struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
+	int count, counts, pack, len;
+
+	count = 0;
+	for (pack = 0; pack <  nr_of_packs(); pack++) {
+		/* calculate the size of a packet */
+		counts = cap_urb->iso_frame_desc[pack].actual_length / usx2y->stride;
+		count += counts;
+		if (counts < 43 || counts > 50) {
+			snd_printk(KERN_ERR "should not be here with counts=%i\n", counts);
+			return -EPIPE;
+		}
+		/* set up descriptor */
+		urb->iso_frame_desc[pack].offset = pack ?
+			urb->iso_frame_desc[pack - 1].offset +
+			urb->iso_frame_desc[pack - 1].length :
+			0;
+		urb->iso_frame_desc[pack].length = cap_urb->iso_frame_desc[pack].actual_length;
+	}
+	if (atomic_read(&subs->state) >= STATE_PRERUNNING) {
+		if (subs->hwptr + count > runtime->buffer_size) {
+			/* err, the transferred area goes over buffer boundary.
+			 * copy the data to the temp buffer.
+			 */
+			len = runtime->buffer_size - subs->hwptr;
+			urb->transfer_buffer = subs->tmpbuf;
+			memcpy(subs->tmpbuf, runtime->dma_area +
+			       subs->hwptr * usx2y->stride, len * usx2y->stride);
+			memcpy(subs->tmpbuf + len * usx2y->stride,
+			       runtime->dma_area, (count - len) * usx2y->stride);
+			subs->hwptr += count;
+			subs->hwptr -= runtime->buffer_size;
+		} else {
+			/* set the buffer pointer */
+			urb->transfer_buffer = runtime->dma_area + subs->hwptr * usx2y->stride;
+			subs->hwptr += count;
+			if (subs->hwptr >= runtime->buffer_size)
+				subs->hwptr -= runtime->buffer_size;
+		}
+	} else {
+		urb->transfer_buffer = subs->tmpbuf;
+	}
+	urb->transfer_buffer_length = count * usx2y->stride;
+	return 0;
+}
+
+/*
+ * process after playback data complete
+ *
+ * update the current position and call callback if a period is processed.
+ */
+static void usx2y_urb_play_retire(struct snd_usx2y_substream *subs, struct urb *urb)
+{
+	struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
+	int		len = urb->actual_length / subs->usx2y->stride;
+
+	subs->transfer_done += len;
+	subs->hwptr_done +=  len;
+	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;
+		snd_pcm_period_elapsed(subs->pcm_substream);
+	}
+}
+
+static int usx2y_urb_submit(struct snd_usx2y_substream *subs, struct urb *urb, int frame)
+{
+	int err;
+
+	if (!urb)
+		return -ENODEV;
+	urb->start_frame = frame + NRURBS * nr_of_packs();  // let hcd do rollover sanity checks
+	urb->hcpriv = NULL;
+	urb->dev = subs->usx2y->dev; /* we need to set this at each time */
+	err = usb_submit_urb(urb, GFP_ATOMIC);
+	if (err < 0) {
+		snd_printk(KERN_ERR "usb_submit_urb() returned %i\n", err);
+		return err;
+	}
+	return 0;
+}
+
+static int usx2y_usbframe_complete(struct snd_usx2y_substream *capsubs,
+				   struct snd_usx2y_substream *playbacksubs,
+				   int frame)
+{
+	int err, state;
+	struct urb *urb = playbacksubs->completed_urb;
+
+	state = atomic_read(&playbacksubs->state);
+	if (urb) {
+		if (state == STATE_RUNNING)
+			usx2y_urb_play_retire(playbacksubs, urb);
+		else if (state >= STATE_PRERUNNING)
+			atomic_inc(&playbacksubs->state);
+	} else {
+		switch (state) {
+		case STATE_STARTING1:
+			urb = playbacksubs->urb[0];
+			atomic_inc(&playbacksubs->state);
+			break;
+		case STATE_STARTING2:
+			urb = playbacksubs->urb[1];
+			atomic_inc(&playbacksubs->state);
+			break;
+		}
+	}
+	if (urb) {
+		err = usx2y_urb_play_prepare(playbacksubs, capsubs->completed_urb, urb);
+		if (err)
+			return err;
+		err = usx2y_urb_submit(playbacksubs, urb, frame);
+		if (err)
+			return err;
+	}
+
+	playbacksubs->completed_urb = NULL;
+
+	state = atomic_read(&capsubs->state);
+	if (state >= STATE_PREPARED) {
+		if (state == STATE_RUNNING) {
+			err = usx2y_urb_capt_retire(capsubs);
+			if (err)
+				return err;
+		} else if (state >= STATE_PRERUNNING) {
+			atomic_inc(&capsubs->state);
+		}
+		err = usx2y_urb_submit(capsubs, capsubs->completed_urb, frame);
+		if (err)
+			return err;
+	}
+	capsubs->completed_urb = NULL;
+	return 0;
+}
+
+static void usx2y_clients_stop(struct usx2ydev *usx2y)
+{
+	struct snd_usx2y_substream *subs;
+	struct urb *urb;
+	int s, u;
+
+	for (s = 0; s < 4; s++) {
+		subs = usx2y->subs[s];
+		if (subs) {
+			snd_printdd("%i %p state=%i\n", s, subs, atomic_read(&subs->state));
+			atomic_set(&subs->state, STATE_STOPPED);
+		}
+	}
+	for (s = 0; s < 4; s++) {
+		subs = usx2y->subs[s];
+		if (subs) {
+			if (atomic_read(&subs->state) >= STATE_PRERUNNING)
+				snd_pcm_stop_xrun(subs->pcm_substream);
+			for (u = 0; u < NRURBS; u++) {
+				urb = subs->urb[u];
+				if (urb)
+					snd_printdd("%i status=%i start_frame=%i\n",
+						    u, urb->status, urb->start_frame);
+			}
+		}
+	}
+	usx2y->prepare_subs = NULL;
+	wake_up(&usx2y->prepare_wait_queue);
+}
+
+static void usx2y_error_urb_status(struct usx2ydev *usx2y,
+				   struct snd_usx2y_substream *subs, struct urb *urb)
+{
+	snd_printk(KERN_ERR "ep=%i stalled with status=%i\n", subs->endpoint, urb->status);
+	urb->status = 0;
+	usx2y_clients_stop(usx2y);
+}
+
+static void i_usx2y_urb_complete(struct urb *urb)
+{
+	struct snd_usx2y_substream *subs = urb->context;
+	struct usx2ydev *usx2y = subs->usx2y;
+	struct snd_usx2y_substream *capsubs, *playbacksubs;
+
+	if (unlikely(atomic_read(&subs->state) < STATE_PREPARED)) {
+		snd_printdd("hcd_frame=%i ep=%i%s status=%i start_frame=%i\n",
+			    usb_get_current_frame_number(usx2y->dev),
+			    subs->endpoint, usb_pipein(urb->pipe) ? "in" : "out",
+			    urb->status, urb->start_frame);
+		return;
+	}
+	if (unlikely(urb->status)) {
+		usx2y_error_urb_status(usx2y, subs, urb);
+		return;
+	}
+
+	subs->completed_urb = urb;
+
+	capsubs = usx2y->subs[SNDRV_PCM_STREAM_CAPTURE];
+	playbacksubs = usx2y->subs[SNDRV_PCM_STREAM_PLAYBACK];
+
+	if (capsubs->completed_urb &&
+	    atomic_read(&capsubs->state) >= STATE_PREPARED &&
+	    (playbacksubs->completed_urb ||
+	     atomic_read(&playbacksubs->state) < STATE_PREPARED)) {
+		if (!usx2y_usbframe_complete(capsubs, playbacksubs, urb->start_frame)) {
+			usx2y->wait_iso_frame += nr_of_packs();
+		} else {
+			snd_printdd("\n");
+			usx2y_clients_stop(usx2y);
+		}
+	}
+}
+
+static void usx2y_urbs_set_complete(struct usx2ydev *usx2y,
+				    void (*complete)(struct urb *))
+{
+	struct snd_usx2y_substream *subs;
+	struct urb *urb;
+	int s, u;
+
+	for (s = 0; s < 4; s++) {
+		subs = usx2y->subs[s];
+		if (subs) {
+			for (u = 0; u < NRURBS; u++) {
+				urb = subs->urb[u];
+				if (urb)
+					urb->complete = complete;
+			}
+		}
+	}
+}
+
+static void usx2y_subs_startup_finish(struct usx2ydev *usx2y)
+{
+	usx2y_urbs_set_complete(usx2y, i_usx2y_urb_complete);
+	usx2y->prepare_subs = NULL;
+}
+
+static void i_usx2y_subs_startup(struct urb *urb)
+{
+	struct snd_usx2y_substream *subs = urb->context;
+	struct usx2ydev *usx2y = subs->usx2y;
+	struct snd_usx2y_substream *prepare_subs = usx2y->prepare_subs;
+
+	if (prepare_subs) {
+		if (urb->start_frame == prepare_subs->urb[0]->start_frame) {
+			usx2y_subs_startup_finish(usx2y);
+			atomic_inc(&prepare_subs->state);
+			wake_up(&usx2y->prepare_wait_queue);
+		}
+	}
+
+	i_usx2y_urb_complete(urb);
+}
+
+static void usx2y_subs_prepare(struct snd_usx2y_substream *subs)
+{
+	snd_printdd("usx2y_substream_prepare(%p) ep=%i urb0=%p urb1=%p\n",
+		    subs, subs->endpoint, subs->urb[0], subs->urb[1]);
+	/* reset the pointer */
+	subs->hwptr = 0;
+	subs->hwptr_done = 0;
+	subs->transfer_done = 0;
+}
+
+static void usx2y_urb_release(struct urb **urb, int free_tb)
+{
+	if (*urb) {
+		usb_kill_urb(*urb);
+		if (free_tb)
+			kfree((*urb)->transfer_buffer);
+		usb_free_urb(*urb);
+		*urb = NULL;
+	}
+}
+
+/*
+ * release a substreams urbs
+ */
+static void usx2y_urbs_release(struct snd_usx2y_substream *subs)
+{
+	int i;
+
+	snd_printdd("%s %i\n", __func__, subs->endpoint);
+	for (i = 0; i < NRURBS; i++)
+		usx2y_urb_release(subs->urb + i,
+				  subs != subs->usx2y->subs[SNDRV_PCM_STREAM_PLAYBACK]);
+
+	kfree(subs->tmpbuf);
+	subs->tmpbuf = NULL;
+}
+
+/*
+ * initialize a substream's urbs
+ */
+static int usx2y_urbs_allocate(struct snd_usx2y_substream *subs)
+{
+	int i;
+	unsigned int pipe;
+	int is_playback = subs == subs->usx2y->subs[SNDRV_PCM_STREAM_PLAYBACK];
+	struct usb_device *dev = subs->usx2y->dev;
+	struct urb **purb;
+
+	pipe = is_playback ? usb_sndisocpipe(dev, subs->endpoint) :
+			usb_rcvisocpipe(dev, subs->endpoint);
+	subs->maxpacksize = usb_maxpacket(dev, pipe);
+	if (!subs->maxpacksize)
+		return -EINVAL;
+
+	if (is_playback && !subs->tmpbuf) {	/* allocate a temporary buffer for playback */
+		subs->tmpbuf = kcalloc(nr_of_packs(), subs->maxpacksize, GFP_KERNEL);
+		if (!subs->tmpbuf)
+			return -ENOMEM;
+	}
+	/* allocate and initialize data urbs */
+	for (i = 0; i < NRURBS; i++) {
+		purb = subs->urb + i;
+		if (*purb) {
+			usb_kill_urb(*purb);
+			continue;
+		}
+		*purb = usb_alloc_urb(nr_of_packs(), GFP_KERNEL);
+		if (!*purb) {
+			usx2y_urbs_release(subs);
+			return -ENOMEM;
+		}
+		if (!is_playback && !(*purb)->transfer_buffer) {
+			/* allocate a capture buffer per urb */
+			(*purb)->transfer_buffer =
+				kmalloc_array(subs->maxpacksize,
+					      nr_of_packs(), GFP_KERNEL);
+			if (!(*purb)->transfer_buffer) {
+				usx2y_urbs_release(subs);
+				return -ENOMEM;
+			}
+		}
+		(*purb)->dev = dev;
+		(*purb)->pipe = pipe;
+		(*purb)->number_of_packets = nr_of_packs();
+		(*purb)->context = subs;
+		(*purb)->interval = 1;
+		(*purb)->complete = i_usx2y_subs_startup;
+	}
+	return 0;
+}
+
+static void usx2y_subs_startup(struct snd_usx2y_substream *subs)
+{
+	struct usx2ydev *usx2y = subs->usx2y;
+
+	usx2y->prepare_subs = subs;
+	subs->urb[0]->start_frame = -1;
+	wmb();
+	usx2y_urbs_set_complete(usx2y, i_usx2y_subs_startup);
+}
+
+static int usx2y_urbs_start(struct snd_usx2y_substream *subs)
+{
+	int i, err;
+	struct usx2ydev *usx2y = subs->usx2y;
+	struct urb *urb;
+	unsigned long pack;
+
+	err = usx2y_urbs_allocate(subs);
+	if (err < 0)
+		return err;
+	subs->completed_urb = NULL;
+	for (i = 0; i < 4; i++) {
+		struct snd_usx2y_substream *subs = usx2y->subs[i];
+
+		if (subs && atomic_read(&subs->state) >= STATE_PREPARED)
+			goto start;
+	}
+
+ start:
+	usx2y_subs_startup(subs);
+	for (i = 0; i < NRURBS; i++) {
+		urb = subs->urb[i];
+		if (usb_pipein(urb->pipe)) {
+			if (!i)
+				atomic_set(&subs->state, STATE_STARTING3);
+			urb->dev = usx2y->dev;
+			for (pack = 0; pack < nr_of_packs(); pack++) {
+				urb->iso_frame_desc[pack].offset = subs->maxpacksize * pack;
+				urb->iso_frame_desc[pack].length = subs->maxpacksize;
+			}
+			urb->transfer_buffer_length = subs->maxpacksize * nr_of_packs();
+			err = usb_submit_urb(urb, GFP_ATOMIC);
+			if (err < 0) {
+				snd_printk(KERN_ERR "cannot submit datapipe for urb %d, err = %d\n", i, err);
+				err = -EPIPE;
+				goto cleanup;
+			} else {
+				if (!i)
+					usx2y->wait_iso_frame = urb->start_frame;
+			}
+			urb->transfer_flags = 0;
+		} else {
+			atomic_set(&subs->state, STATE_STARTING1);
+			break;
+		}
+	}
+	err = 0;
+	wait_event(usx2y->prepare_wait_queue, !usx2y->prepare_subs);
+	if (atomic_read(&subs->state) != STATE_PREPARED)
+		err = -EPIPE;
+
+ cleanup:
+	if (err) {
+		usx2y_subs_startup_finish(usx2y);
+		usx2y_clients_stop(usx2y);	// something is completely wrong > stop everything
+	}
+	return err;
+}
+
+/*
+ * return the current pcm pointer.  just return the hwptr_done value.
+ */
+static snd_pcm_uframes_t snd_usx2y_pcm_pointer(struct snd_pcm_substream *substream)
+{
+	struct snd_usx2y_substream *subs = substream->runtime->private_data;
+
+	return subs->hwptr_done;
+}
+
+/*
+ * start/stop substream
+ */
+static int snd_usx2y_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_usx2y_substream *subs = substream->runtime->private_data;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		snd_printdd("%s(START)\n", __func__);
+		if (atomic_read(&subs->state) == STATE_PREPARED &&
+		    atomic_read(&subs->usx2y->subs[SNDRV_PCM_STREAM_CAPTURE]->state) >= STATE_PREPARED) {
+			atomic_set(&subs->state, STATE_PRERUNNING);
+		} else {
+			snd_printdd("\n");
+			return -EPIPE;
+		}
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+		snd_printdd("%s(STOP)\n", __func__);
+		if (atomic_read(&subs->state) >= STATE_PRERUNNING)
+			atomic_set(&subs->state, STATE_PREPARED);
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+/*
+ * allocate a buffer, setup samplerate
+ *
+ * so far we use a physically linear buffer although packetize transfer
+ * doesn't need a continuous area.
+ * if sg buffer is supported on the later version of alsa, we'll follow
+ * that.
+ */
+struct s_c2 {
+	char c1, c2;
+};
+
+static const struct s_c2 setrate_44100[] = {
+	{ 0x14, 0x08},	// this line sets 44100, well actually a little less
+	{ 0x18, 0x40},	// only tascam / frontier design knows the further lines .......
+	{ 0x18, 0x42},
+	{ 0x18, 0x45},
+	{ 0x18, 0x46},
+	{ 0x18, 0x48},
+	{ 0x18, 0x4A},
+	{ 0x18, 0x4C},
+	{ 0x18, 0x4E},
+	{ 0x18, 0x50},
+	{ 0x18, 0x52},
+	{ 0x18, 0x54},
+	{ 0x18, 0x56},
+	{ 0x18, 0x58},
+	{ 0x18, 0x5A},
+	{ 0x18, 0x5C},
+	{ 0x18, 0x5E},
+	{ 0x18, 0x60},
+	{ 0x18, 0x62},
+	{ 0x18, 0x64},
+	{ 0x18, 0x66},
+	{ 0x18, 0x68},
+	{ 0x18, 0x6A},
+	{ 0x18, 0x6C},
+	{ 0x18, 0x6E},
+	{ 0x18, 0x70},
+	{ 0x18, 0x72},
+	{ 0x18, 0x74},
+	{ 0x18, 0x76},
+	{ 0x18, 0x78},
+	{ 0x18, 0x7A},
+	{ 0x18, 0x7C},
+	{ 0x18, 0x7E}
+};
+
+static const struct s_c2 setrate_48000[] = {
+	{ 0x14, 0x09},	// this line sets 48000, well actually a little less
+	{ 0x18, 0x40},	// only tascam / frontier design knows the further lines .......
+	{ 0x18, 0x42},
+	{ 0x18, 0x45},
+	{ 0x18, 0x46},
+	{ 0x18, 0x48},
+	{ 0x18, 0x4A},
+	{ 0x18, 0x4C},
+	{ 0x18, 0x4E},
+	{ 0x18, 0x50},
+	{ 0x18, 0x52},
+	{ 0x18, 0x54},
+	{ 0x18, 0x56},
+	{ 0x18, 0x58},
+	{ 0x18, 0x5A},
+	{ 0x18, 0x5C},
+	{ 0x18, 0x5E},
+	{ 0x18, 0x60},
+	{ 0x18, 0x62},
+	{ 0x18, 0x64},
+	{ 0x18, 0x66},
+	{ 0x18, 0x68},
+	{ 0x18, 0x6A},
+	{ 0x18, 0x6C},
+	{ 0x18, 0x6E},
+	{ 0x18, 0x70},
+	{ 0x18, 0x73},
+	{ 0x18, 0x74},
+	{ 0x18, 0x76},
+	{ 0x18, 0x78},
+	{ 0x18, 0x7A},
+	{ 0x18, 0x7C},
+	{ 0x18, 0x7E}
+};
+
+#define NOOF_SETRATE_URBS ARRAY_SIZE(setrate_48000)
+
+static void i_usx2y_04int(struct urb *urb)
+{
+	struct usx2ydev *usx2y = urb->context;
+
+	if (urb->status)
+		snd_printk(KERN_ERR "snd_usx2y_04int() urb->status=%i\n", urb->status);
+	if (!--usx2y->us04->len)
+		wake_up(&usx2y->in04_wait_queue);
+}
+
+static int usx2y_rate_set(struct usx2ydev *usx2y, int rate)
+{
+	int err = 0, i;
+	struct snd_usx2y_urb_seq *us = NULL;
+	int *usbdata = NULL;
+	const struct s_c2 *ra = rate == 48000 ? setrate_48000 : setrate_44100;
+	struct urb *urb;
+
+	if (usx2y->rate != rate) {
+		us = kzalloc(struct_size(us, urb, NOOF_SETRATE_URBS),
+			     GFP_KERNEL);
+		if (!us) {
+			err = -ENOMEM;
+			goto cleanup;
+		}
+		usbdata = kmalloc_array(NOOF_SETRATE_URBS, sizeof(int),
+					GFP_KERNEL);
+		if (!usbdata) {
+			err = -ENOMEM;
+			goto cleanup;
+		}
+		for (i = 0; i < NOOF_SETRATE_URBS; ++i) {
+			us->urb[i] = usb_alloc_urb(0, GFP_KERNEL);
+			if (!us->urb[i]) {
+				err = -ENOMEM;
+				goto cleanup;
+			}
+			((char *)(usbdata + i))[0] = ra[i].c1;
+			((char *)(usbdata + i))[1] = ra[i].c2;
+			usb_fill_bulk_urb(us->urb[i], usx2y->dev, usb_sndbulkpipe(usx2y->dev, 4),
+					  usbdata + i, 2, i_usx2y_04int, usx2y);
+		}
+		err = usb_urb_ep_type_check(us->urb[0]);
+		if (err < 0)
+			goto cleanup;
+		us->submitted =	0;
+		us->len =	NOOF_SETRATE_URBS;
+		usx2y->us04 =	us;
+		wait_event_timeout(usx2y->in04_wait_queue, !us->len, HZ);
+		usx2y->us04 =	NULL;
+		if (us->len)
+			err = -ENODEV;
+	cleanup:
+		if (us) {
+			us->submitted =	2*NOOF_SETRATE_URBS;
+			for (i = 0; i < NOOF_SETRATE_URBS; ++i) {
+				urb = us->urb[i];
+				if (!urb)
+					continue;
+				if (urb->status) {
+					if (!err)
+						err = -ENODEV;
+					usb_kill_urb(urb);
+				}
+				usb_free_urb(urb);
+			}
+			usx2y->us04 = NULL;
+			kfree(usbdata);
+			kfree(us);
+			if (!err)
+				usx2y->rate = rate;
+		}
+	}
+
+	return err;
+}
+
+static int usx2y_format_set(struct usx2ydev *usx2y, snd_pcm_format_t format)
+{
+	int alternate, err;
+	struct list_head *p;
+
+	if (format == SNDRV_PCM_FORMAT_S24_3LE) {
+		alternate = 2;
+		usx2y->stride = 6;
+	} else {
+		alternate = 1;
+		usx2y->stride = 4;
+	}
+	list_for_each(p, &usx2y->midi_list) {
+		snd_usbmidi_input_stop(p);
+	}
+	usb_kill_urb(usx2y->in04_urb);
+	err = usb_set_interface(usx2y->dev, 0, alternate);
+	if (err) {
+		snd_printk(KERN_ERR "usb_set_interface error\n");
+		return err;
+	}
+	usx2y->in04_urb->dev = usx2y->dev;
+	err = usb_submit_urb(usx2y->in04_urb, GFP_KERNEL);
+	list_for_each(p, &usx2y->midi_list) {
+		snd_usbmidi_input_start(p);
+	}
+	usx2y->format = format;
+	usx2y->rate = 0;
+	return err;
+}
+
+
+static int snd_usx2y_pcm_hw_params(struct snd_pcm_substream *substream,
+				   struct snd_pcm_hw_params *hw_params)
+{
+	int			err = 0;
+	unsigned int		rate = params_rate(hw_params);
+	snd_pcm_format_t	format = params_format(hw_params);
+	struct snd_card *card = substream->pstr->pcm->card;
+	struct usx2ydev	*dev = usx2y(card);
+	struct snd_usx2y_substream *subs;
+	struct snd_pcm_substream *test_substream;
+	int i;
+
+	mutex_lock(&usx2y(card)->pcm_mutex);
+	snd_printdd("snd_usx2y_hw_params(%p, %p)\n", substream, hw_params);
+	/* all pcm substreams off one usx2y have to operate at the same
+	 * rate & format
+	 */
+	for (i = 0; i < dev->pcm_devs * 2; i++) {
+		subs = dev->subs[i];
+		if (!subs)
+			continue;
+		test_substream = subs->pcm_substream;
+		if (!test_substream || test_substream == substream ||
+		    !test_substream->runtime)
+			continue;
+		if ((test_substream->runtime->format &&
+		     test_substream->runtime->format != format) ||
+		    (test_substream->runtime->rate &&
+		     test_substream->runtime->rate != rate)) {
+			err = -EINVAL;
+			goto error;
+		}
+	}
+
+ error:
+	mutex_unlock(&usx2y(card)->pcm_mutex);
+	return err;
+}
+
+/*
+ * free the buffer
+ */
+static int snd_usx2y_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_usx2y_substream *subs = runtime->private_data;
+	struct snd_usx2y_substream *cap_subs, *playback_subs;
+
+	mutex_lock(&subs->usx2y->pcm_mutex);
+	snd_printdd("snd_usx2y_hw_free(%p)\n", substream);
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		cap_subs = subs->usx2y->subs[SNDRV_PCM_STREAM_CAPTURE];
+		atomic_set(&subs->state, STATE_STOPPED);
+		usx2y_urbs_release(subs);
+		if (!cap_subs->pcm_substream ||
+		    !cap_subs->pcm_substream->runtime ||
+		    cap_subs->pcm_substream->runtime->state < SNDRV_PCM_STATE_PREPARED) {
+			atomic_set(&cap_subs->state, STATE_STOPPED);
+			usx2y_urbs_release(cap_subs);
+		}
+	} else {
+		playback_subs = subs->usx2y->subs[SNDRV_PCM_STREAM_PLAYBACK];
+		if (atomic_read(&playback_subs->state) < STATE_PREPARED) {
+			atomic_set(&subs->state, STATE_STOPPED);
+			usx2y_urbs_release(subs);
+		}
+	}
+	mutex_unlock(&subs->usx2y->pcm_mutex);
+	return 0;
+}
+
+/*
+ * prepare callback
+ *
+ * set format and initialize urbs
+ */
+static int snd_usx2y_pcm_prepare(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_usx2y_substream *subs = runtime->private_data;
+	struct usx2ydev *usx2y = subs->usx2y;
+	struct snd_usx2y_substream *capsubs = subs->usx2y->subs[SNDRV_PCM_STREAM_CAPTURE];
+	int err = 0;
+
+	snd_printdd("%s(%p)\n", __func__, substream);
+
+	mutex_lock(&usx2y->pcm_mutex);
+	usx2y_subs_prepare(subs);
+	// Start hardware streams
+	// SyncStream first....
+	if (atomic_read(&capsubs->state) < STATE_PREPARED) {
+		if (usx2y->format != runtime->format) {
+			err = usx2y_format_set(usx2y, runtime->format);
+			if (err < 0)
+				goto up_prepare_mutex;
+		}
+		if (usx2y->rate != runtime->rate) {
+			err = usx2y_rate_set(usx2y, runtime->rate);
+			if (err < 0)
+				goto up_prepare_mutex;
+		}
+		snd_printdd("starting capture pipe for %s\n", subs == capsubs ? "self" : "playpipe");
+		err = usx2y_urbs_start(capsubs);
+		if (err < 0)
+			goto up_prepare_mutex;
+	}
+
+	if (subs != capsubs && atomic_read(&subs->state) < STATE_PREPARED)
+		err = usx2y_urbs_start(subs);
+
+ up_prepare_mutex:
+	mutex_unlock(&usx2y->pcm_mutex);
+	return err;
+}
+
+static const struct snd_pcm_hardware snd_usx2y_2c = {
+	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
+				 SNDRV_PCM_INFO_BLOCK_TRANSFER |
+				 SNDRV_PCM_INFO_MMAP_VALID |
+				 SNDRV_PCM_INFO_BATCH),
+	.formats =                 SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE,
+	.rates =                   SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
+	.rate_min =                44100,
+	.rate_max =                48000,
+	.channels_min =            2,
+	.channels_max =            2,
+	.buffer_bytes_max =	(2*128*1024),
+	.period_bytes_min =	64,
+	.period_bytes_max =	(128*1024),
+	.periods_min =		2,
+	.periods_max =		1024,
+	.fifo_size =              0
+};
+
+static int snd_usx2y_pcm_open(struct snd_pcm_substream *substream)
+{
+	struct snd_usx2y_substream	*subs =
+		((struct snd_usx2y_substream **)
+		 snd_pcm_substream_chip(substream))[substream->stream];
+	struct snd_pcm_runtime	*runtime = substream->runtime;
+
+	if (subs->usx2y->chip_status & USX2Y_STAT_CHIP_MMAP_PCM_URBS)
+		return -EBUSY;
+
+	runtime->hw = snd_usx2y_2c;
+	runtime->private_data = subs;
+	subs->pcm_substream = substream;
+	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1000, 200000);
+	return 0;
+}
+
+static int snd_usx2y_pcm_close(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_usx2y_substream *subs = runtime->private_data;
+
+	subs->pcm_substream = NULL;
+
+	return 0;
+}
+
+static const struct snd_pcm_ops snd_usx2y_pcm_ops = {
+	.open =		snd_usx2y_pcm_open,
+	.close =	snd_usx2y_pcm_close,
+	.hw_params =	snd_usx2y_pcm_hw_params,
+	.hw_free =	snd_usx2y_pcm_hw_free,
+	.prepare =	snd_usx2y_pcm_prepare,
+	.trigger =	snd_usx2y_pcm_trigger,
+	.pointer =	snd_usx2y_pcm_pointer,
+};
+
+/*
+ * free a usb stream instance
+ */
+static void usx2y_audio_stream_free(struct snd_usx2y_substream **usx2y_substream)
+{
+	int stream;
+
+	for_each_pcm_streams(stream) {
+		kfree(usx2y_substream[stream]);
+		usx2y_substream[stream] = NULL;
+	}
+}
+
+static void snd_usx2y_pcm_private_free(struct snd_pcm *pcm)
+{
+	struct snd_usx2y_substream **usx2y_stream = pcm->private_data;
+
+	if (usx2y_stream)
+		usx2y_audio_stream_free(usx2y_stream);
+}
+
+static int usx2y_audio_stream_new(struct snd_card *card, int playback_endpoint, int capture_endpoint)
+{
+	struct snd_pcm *pcm;
+	int err, i;
+	struct snd_usx2y_substream **usx2y_substream =
+		usx2y(card)->subs + 2 * usx2y(card)->pcm_devs;
+
+	for (i = playback_endpoint ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
+	     i <= SNDRV_PCM_STREAM_CAPTURE; ++i) {
+		usx2y_substream[i] = kzalloc(sizeof(struct snd_usx2y_substream), GFP_KERNEL);
+		if (!usx2y_substream[i])
+			return -ENOMEM;
+
+		usx2y_substream[i]->usx2y = usx2y(card);
+	}
+
+	if (playback_endpoint)
+		usx2y_substream[SNDRV_PCM_STREAM_PLAYBACK]->endpoint = playback_endpoint;
+	usx2y_substream[SNDRV_PCM_STREAM_CAPTURE]->endpoint = capture_endpoint;
+
+	err = snd_pcm_new(card, NAME_ALLCAPS" Audio", usx2y(card)->pcm_devs,
+			  playback_endpoint ? 1 : 0, 1,
+			  &pcm);
+	if (err < 0) {
+		usx2y_audio_stream_free(usx2y_substream);
+		return err;
+	}
+
+	if (playback_endpoint)
+		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_usx2y_pcm_ops);
+	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_usx2y_pcm_ops);
+
+	pcm->private_data = usx2y_substream;
+	pcm->private_free = snd_usx2y_pcm_private_free;
+	pcm->info_flags = 0;
+
+	sprintf(pcm->name, NAME_ALLCAPS" Audio #%d", usx2y(card)->pcm_devs);
+
+	if (playback_endpoint) {
+		snd_pcm_set_managed_buffer(pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream,
+					   SNDRV_DMA_TYPE_CONTINUOUS,
+					   NULL,
+					   64*1024, 128*1024);
+	}
+
+	snd_pcm_set_managed_buffer(pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream,
+				   SNDRV_DMA_TYPE_CONTINUOUS,
+				   NULL,
+				   64*1024, 128*1024);
+	usx2y(card)->pcm_devs++;
+
+	return 0;
+}
+
+/*
+ * create a chip instance and set its names.
+ */
+int usx2y_audio_create(struct snd_card *card)
+{
+	int err;
+
+	err = usx2y_audio_stream_new(card, 0xA, 0x8);
+	if (err < 0)
+		return err;
+	if (le16_to_cpu(usx2y(card)->dev->descriptor.idProduct) == USB_ID_US428) {
+		err = usx2y_audio_stream_new(card, 0, 0xA);
+		if (err < 0)
+			return err;
+	}
+	if (le16_to_cpu(usx2y(card)->dev->descriptor.idProduct) != USB_ID_US122)
+		err = usx2y_rate_set(usx2y(card), 44100);	// Lets us428 recognize output-volume settings, disturbs us122.
+	return err;
+}