From 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 13 May 2024 10:30:14 +0000
Subject: [PATCH] modify sin led gpio

---
 kernel/drivers/usb/gadget/function/u_audio.c | 1218 ++++++++++++++++++++++++++++++++++++++++++++-------------
 1 files changed, 928 insertions(+), 290 deletions(-)

diff --git a/kernel/drivers/usb/gadget/function/u_audio.c b/kernel/drivers/usb/gadget/function/u_audio.c
index 3476333..cb15ec8 100644
--- a/kernel/drivers/usb/gadget/function/u_audio.c
+++ b/kernel/drivers/usb/gadget/function/u_audio.c
@@ -12,12 +12,14 @@
  *    Jaswinder Singh (jaswinder.singh@linaro.org)
  */
 
+#include <linux/kernel.h>
 #include <linux/module.h>
-#include <linux/usb/audio.h>
-#include <sound/control.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
+#include <sound/control.h>
+#include <sound/tlv.h>
+#include <linux/usb/audio.h>
 
 #include "u_audio.h"
 
@@ -25,14 +27,15 @@
 #define PRD_SIZE_MAX	PAGE_SIZE
 #define MIN_PERIODS	4
 
-#define CLK_PPM_GROUP_SIZE	20
-
-static struct class *audio_class;
-
-struct uac_req {
-	struct uac_rtd_params *pp; /* parent param */
-	struct usb_request *req;
+enum {
+	UAC_FBACK_CTRL,
+	UAC_P_PITCH_CTRL,
+	UAC_MUTE_CTRL,
+	UAC_VOLUME_CTRL,
+	UAC_RATE_CTRL,
 };
+
+#define CLK_PPM_GROUP_SIZE	20
 
 /* Runtime data params for one stream */
 struct uac_rtd_params {
@@ -46,10 +49,28 @@
 
 	void *rbuf;
 
-	unsigned max_psize;	/* MaxPacketSize of endpoint */
-	struct uac_req *ureq;
+	unsigned int pitch;	/* Stream pitch ratio to 1000000 */
+	unsigned int max_psize;	/* MaxPacketSize of endpoint */
 
-	spinlock_t lock;
+	struct usb_request **reqs;
+
+	struct usb_request *req_fback; /* Feedback endpoint request */
+	bool fb_ep_enabled; /* if the ep is enabled */
+
+  /* Volume/Mute controls and their state */
+  int fu_id; /* Feature Unit ID */
+  struct snd_kcontrol *snd_kctl_volume;
+  struct snd_kcontrol *snd_kctl_mute;
+  s16 volume_min, volume_max, volume_res;
+  s16 volume;
+  int mute;
+
+	struct snd_kcontrol *snd_kctl_rate; /* read-only current rate */
+	int srate; /* selected samplerate */
+	int active; /* playback/capture running */
+
+  spinlock_t lock; /* lock for control transfers */
+
 };
 
 struct snd_uac_chip {
@@ -61,13 +82,9 @@
 	struct snd_card *card;
 	struct snd_pcm *pcm;
 
-	/* timekeeping for the playback endpoint */
-	unsigned int p_interval;
-	unsigned int p_residue;
-
 	/* pre-calculated values for playback iso completion */
-	unsigned int p_pktsize;
-	unsigned int p_pktsize_residue;
+	unsigned long long p_residue_mil;
+	unsigned int p_interval;
 	unsigned int p_framesize;
 };
 
@@ -82,17 +99,69 @@
 	.periods_min = MIN_PERIODS,
 };
 
+static struct class *audio_class;
+
+static void u_audio_set_fback_frequency(enum usb_device_speed speed,
+					struct usb_ep *out_ep,
+					unsigned long long freq,
+					unsigned int pitch,
+					void *buf)
+{
+	u32 ff = 0;
+	const struct usb_endpoint_descriptor *ep_desc;
+
+	/*
+	 * Because the pitch base is 1000000, the final divider here
+	 * will be 1000 * 1000000 = 1953125 << 9
+	 *
+	 * Instead of dealing with big numbers lets fold this 9 left shift
+	 */
+
+	if (speed == USB_SPEED_FULL) {
+		/*
+		 * Full-speed feedback endpoints report frequency
+		 * in samples/frame
+		 * Format is encoded in Q10.10 left-justified in the 24 bits,
+		 * so that it has a Q10.14 format.
+		 *
+		 * ff = (freq << 14) / 1000
+		 */
+		freq <<= 5;
+	} else {
+		/*
+		 * High-speed feedback endpoints report frequency
+		 * in samples/microframe.
+		 * Format is encoded in Q12.13 fitted into four bytes so that
+		 * the binary point is located between the second and the third
+		 * byte fromat (that is Q16.16)
+		 *
+		 * ff = (freq << 16) / 8000
+		 *
+		 * Win10 and OSX UAC2 drivers require number of samples per packet
+		 * in order to honor the feedback value.
+		 * Linux snd-usb-audio detects the applied bit-shift automatically.
+		 */
+		ep_desc = out_ep->desc;
+		freq <<= 4 + (ep_desc->bInterval - 1);
+	}
+
+	ff = DIV_ROUND_CLOSEST_ULL((freq * pitch), 1953125);
+
+	*(__le32 *)buf = cpu_to_le32(ff);
+}
+
 static void u_audio_iso_complete(struct usb_ep *ep, struct usb_request *req)
 {
-	unsigned pending;
-	unsigned long flags, flags2;
+	unsigned int pending;
 	unsigned int hw_ptr;
 	int status = req->status;
-	struct uac_req *ur = req->context;
 	struct snd_pcm_substream *substream;
 	struct snd_pcm_runtime *runtime;
-	struct uac_rtd_params *prm = ur->pp;
+	struct uac_rtd_params *prm = req->context;
 	struct snd_uac_chip *uac = prm->uac;
+	unsigned int frames, p_pktsize;
+	unsigned long long pitched_rate_mil, p_pktsize_residue_mil,
+			residue_frames_mil, div_result;
 
 	/* i/f shutting down */
 	if (!prm->ep_enabled) {
@@ -117,15 +186,13 @@
 	if (!substream)
 		goto exit;
 
-	snd_pcm_stream_lock_irqsave(substream, flags2);
+	snd_pcm_stream_lock(substream);
 
 	runtime = substream->runtime;
 	if (!runtime || !snd_pcm_running(substream)) {
-		snd_pcm_stream_unlock_irqrestore(substream, flags2);
+		snd_pcm_stream_unlock(substream);
 		goto exit;
 	}
-
-	spin_lock_irqsave(&prm->lock, flags);
 
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		/*
@@ -134,26 +201,49 @@
 		 * If there is a residue from this division, add it to the
 		 * residue accumulator.
 		 */
-		req->length = uac->p_pktsize;
-		uac->p_residue += uac->p_pktsize_residue;
+		unsigned long long p_interval_mil = uac->p_interval * 1000000ULL;
+
+		pitched_rate_mil = (unsigned long long) prm->srate * prm->pitch;
+		div_result = pitched_rate_mil;
+		do_div(div_result, uac->p_interval);
+		do_div(div_result, 1000000);
+		frames = (unsigned int) div_result;
+
+		pr_debug("p_srate %d, pitch %d, interval_mil %llu, frames %d\n",
+				prm->srate, prm->pitch, p_interval_mil, frames);
+
+		p_pktsize = min_t(unsigned int,
+					uac->p_framesize * frames,
+					ep->maxpacket);
+
+		if (p_pktsize < ep->maxpacket) {
+			residue_frames_mil = pitched_rate_mil - frames * p_interval_mil;
+			p_pktsize_residue_mil = uac->p_framesize * residue_frames_mil;
+		} else
+			p_pktsize_residue_mil = 0;
+
+		req->length = p_pktsize;
+		uac->p_residue_mil += p_pktsize_residue_mil;
 
 		/*
-		 * Whenever there are more bytes in the accumulator than we
+		 * Whenever there are more bytes in the accumulator p_residue_mil than we
 		 * need to add one more sample frame, increase this packet's
 		 * size and decrease the accumulator.
 		 */
-		if (uac->p_residue / uac->p_interval >= uac->p_framesize) {
+		div_result = uac->p_residue_mil;
+		do_div(div_result, uac->p_interval);
+		do_div(div_result, 1000000);
+		if ((unsigned int) div_result >= uac->p_framesize) {
 			req->length += uac->p_framesize;
-			uac->p_residue -= uac->p_framesize *
-					   uac->p_interval;
+			uac->p_residue_mil -= uac->p_framesize * p_interval_mil;
+			pr_debug("increased req length to %d\n", req->length);
 		}
+		pr_debug("remains uac->p_residue_mil %llu\n", uac->p_residue_mil);
 
 		req->actual = req->length;
 	}
 
 	hw_ptr = prm->hw_ptr;
-
-	spin_unlock_irqrestore(&prm->lock, flags);
 
 	/* Pack USB load in ALSA ring buffer */
 	pending = runtime->dma_bytes - hw_ptr;
@@ -178,17 +268,49 @@
 		}
 	}
 
-	spin_lock_irqsave(&prm->lock, flags);
 	/* update hw_ptr after data is copied to memory */
 	prm->hw_ptr = (hw_ptr + req->actual) % runtime->dma_bytes;
 	hw_ptr = prm->hw_ptr;
-	spin_unlock_irqrestore(&prm->lock, flags);
-	snd_pcm_stream_unlock_irqrestore(substream, flags2);
+	snd_pcm_stream_unlock(substream);
 
 	if ((hw_ptr % snd_pcm_lib_period_bytes(substream)) < req->actual)
 		snd_pcm_period_elapsed(substream);
 
 exit:
+	if (usb_ep_queue(ep, req, GFP_ATOMIC))
+		dev_err(uac->card->dev, "%d Error!\n", __LINE__);
+}
+
+static void u_audio_iso_fback_complete(struct usb_ep *ep,
+				       struct usb_request *req)
+{
+	struct uac_rtd_params *prm = req->context;
+	struct snd_uac_chip *uac = prm->uac;
+	struct g_audio *audio_dev = uac->audio_dev;
+	int status = req->status;
+
+	/* i/f shutting down */
+	if (!prm->fb_ep_enabled) {
+		kfree(req->buf);
+		usb_ep_free_request(ep, req);
+		return;
+	}
+
+	if (req->status == -ESHUTDOWN)
+		return;
+
+	/*
+	 * We can't really do much about bad xfers.
+	 * Afterall, the ISOCH xfers could fail legitimately.
+	 */
+	if (status)
+		pr_debug("%s: iso_complete status(%d) %d/%d\n",
+			__func__, status, req->actual, req->length);
+
+	u_audio_set_fback_frequency(audio_dev->gadget->speed, audio_dev->out_ep,
+				    prm->srate, prm->pitch,
+				    req->buf);
+
 	if (usb_ep_queue(ep, req, GFP_ATOMIC))
 		dev_err(uac->card->dev, "%d Error!\n", __LINE__);
 }
@@ -199,7 +321,6 @@
 	struct uac_rtd_params *prm;
 	struct g_audio *audio_dev;
 	struct uac_params *params;
-	unsigned long flags;
 	int err = 0;
 
 	audio_dev = uac->audio_dev;
@@ -209,8 +330,6 @@
 		prm = &uac->p_prm;
 	else
 		prm = &uac->c_prm;
-
-	spin_lock_irqsave(&prm->lock, flags);
 
 	/* Reset */
 	prm->hw_ptr = 0;
@@ -227,8 +346,6 @@
 	default:
 		err = -EINVAL;
 	}
-
-	spin_unlock_irqrestore(&prm->lock, flags);
 
 	/* Clear buffer after Play stops */
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && !prm->ss)
@@ -250,75 +367,58 @@
 	return bytes_to_frames(substream->runtime, prm->hw_ptr);
 }
 
-static int uac_pcm_hw_params(struct snd_pcm_substream *substream,
-			       struct snd_pcm_hw_params *hw_params)
+static u64 uac_ssize_to_fmt(int ssize)
 {
-	return snd_pcm_lib_malloc_pages(substream,
-					params_buffer_bytes(hw_params));
-}
+	u64 ret;
 
-static int uac_pcm_hw_free(struct snd_pcm_substream *substream)
-{
-	return snd_pcm_lib_free_pages(substream);
+	switch (ssize) {
+	case 3:
+		ret = SNDRV_PCM_FMTBIT_S24_3LE;
+		break;
+	case 4:
+		ret = SNDRV_PCM_FMTBIT_S32_LE;
+		break;
+	default:
+		ret = SNDRV_PCM_FMTBIT_S16_LE;
+		break;
+	}
+
+	return ret;
 }
 
 static int uac_pcm_open(struct snd_pcm_substream *substream)
 {
 	struct snd_uac_chip *uac = snd_pcm_substream_chip(substream);
 	struct snd_pcm_runtime *runtime = substream->runtime;
-	struct g_audio *audio_dev = uac->audio_dev;
+	struct g_audio *audio_dev;
 	struct uac_params *params;
+	struct uac_rtd_params *prm;
 	int p_ssize, c_ssize;
-	int p_srate, c_srate;
 	int p_chmask, c_chmask;
 
+	audio_dev = uac->audio_dev;
 	params = &audio_dev->params;
 	p_ssize = params->p_ssize;
 	c_ssize = params->c_ssize;
-	p_srate = params->p_srate_active;
-	c_srate = params->c_srate_active;
 	p_chmask = params->p_chmask;
 	c_chmask = params->c_chmask;
-	uac->p_residue = 0;
+	uac->p_residue_mil = 0;
 
 	runtime->hw = uac_pcm_hardware;
 
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
-		spin_lock_init(&uac->p_prm.lock);
-		runtime->hw.rate_min = p_srate;
-		switch (p_ssize) {
-		case 3:
-			runtime->hw.formats = SNDRV_PCM_FMTBIT_S24_3LE;
-			break;
-		case 4:
-			runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE;
-			break;
-		default:
-			runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE;
-			break;
-		}
+		runtime->hw.formats = uac_ssize_to_fmt(p_ssize);
 		runtime->hw.channels_min = num_channels(p_chmask);
-		runtime->hw.period_bytes_min = 2 * uac->p_prm.max_psize
-						/ runtime->hw.periods_min;
+		prm = &uac->p_prm;
 	} else {
-		spin_lock_init(&uac->c_prm.lock);
-		runtime->hw.rate_min = c_srate;
-		switch (c_ssize) {
-		case 3:
-			runtime->hw.formats = SNDRV_PCM_FMTBIT_S24_3LE;
-			break;
-		case 4:
-			runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE;
-			break;
-		default:
-			runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE;
-			break;
-		}
+		runtime->hw.formats = uac_ssize_to_fmt(c_ssize);
 		runtime->hw.channels_min = num_channels(c_chmask);
-		runtime->hw.period_bytes_min = 2 * uac->c_prm.max_psize
-						/ runtime->hw.periods_min;
+		prm = &uac->c_prm;
 	}
 
+	runtime->hw.period_bytes_min = 2 * prm->max_psize
+					/ runtime->hw.periods_min;
+	runtime->hw.rate_min = prm->srate;
 	runtime->hw.rate_max = runtime->hw.rate_min;
 	runtime->hw.channels_max = runtime->hw.channels_min;
 
@@ -326,52 +426,6 @@
 
 	return 0;
 }
-
-static int uac_pcm_rate_info(struct snd_kcontrol *kcontrol,
-				struct snd_ctl_elem_info *uinfo)
-{
-	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
-	uinfo->count = 1;
-	uinfo->value.integer.min = 0;
-	uinfo->value.integer.max = 324000;
-	return 0;
-}
-
-static int uac_pcm_rate_get(struct snd_kcontrol *kcontrol,
-			       struct snd_ctl_elem_value *ucontrol)
-{
-	struct snd_uac_chip *uac = snd_kcontrol_chip(kcontrol);
-	struct g_audio *audio_dev = uac->audio_dev;
-	struct uac_params *params = &audio_dev->params;
-
-	if (kcontrol->private_value == SNDRV_PCM_STREAM_CAPTURE)
-		ucontrol->value.integer.value[0] = params->c_srate_active;
-	else if (kcontrol->private_value == SNDRV_PCM_STREAM_PLAYBACK)
-		ucontrol->value.integer.value[0] = params->p_srate_active;
-	else
-		return -EINVAL;
-
-	return 0;
-}
-
-static struct snd_kcontrol_new uac_pcm_controls[] = {
-{
-	.iface = SNDRV_CTL_ELEM_IFACE_PCM,
-	.name = "Capture Rate",
-	.access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
-	.info = uac_pcm_rate_info,
-	.get = uac_pcm_rate_get,
-	.private_value = SNDRV_PCM_STREAM_CAPTURE,
-},
-{
-	.iface = SNDRV_CTL_ELEM_IFACE_PCM,
-	.name = "Playback Rate",
-	.access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
-	.info = uac_pcm_rate_info,
-	.get = uac_pcm_rate_get,
-	.private_value = SNDRV_PCM_STREAM_PLAYBACK,
-},
-};
 
 /* ALSA cries without these function pointers */
 static int uac_pcm_null(struct snd_pcm_substream *substream)
@@ -382,9 +436,6 @@
 static const struct snd_pcm_ops uac_pcm_ops = {
 	.open = uac_pcm_open,
 	.close = uac_pcm_null,
-	.ioctl = snd_pcm_lib_ioctl,
-	.hw_params = uac_pcm_hw_params,
-	.hw_free = uac_pcm_hw_free,
 	.trigger = uac_pcm_trigger,
 	.pointer = uac_pcm_pointer,
 	.prepare = uac_pcm_null,
@@ -404,16 +455,16 @@
 	params = &audio_dev->params;
 
 	for (i = 0; i < params->req_number; i++) {
-		if (prm->ureq[i].req) {
-			if (usb_ep_dequeue(ep, prm->ureq[i].req))
-				usb_ep_free_request(ep, prm->ureq[i].req);
+		if (prm->reqs[i]) {
+			if (usb_ep_dequeue(ep, prm->reqs[i]))
+				usb_ep_free_request(ep, prm->reqs[i]);
 			/*
 			 * If usb_ep_dequeue() cannot successfully dequeue the
 			 * request, the request will be freed by the completion
 			 * callback.
 			 */
 
-			prm->ureq[i].req = NULL;
+			prm->reqs[i] = NULL;
 		}
 	}
 
@@ -423,34 +474,62 @@
 		dev_err(uac->card->dev, "%s:%d Error!\n", __func__, __LINE__);
 }
 
-static struct snd_kcontrol *u_audio_get_ctl(struct g_audio *audio_dev,
-		const char *name)
+static inline void free_ep_fback(struct uac_rtd_params *prm, struct usb_ep *ep)
 {
-	struct snd_ctl_elem_id elem_id;
+	struct snd_uac_chip *uac = prm->uac;
 
-	memset(&elem_id, 0, sizeof(elem_id));
-	elem_id.iface = SNDRV_CTL_ELEM_IFACE_PCM;
-	strlcpy(elem_id.name, name, sizeof(elem_id.name));
-	return snd_ctl_find_id(audio_dev->uac->card, &elem_id);
+	if (!prm->fb_ep_enabled)
+		return;
+
+	prm->fb_ep_enabled = false;
+
+	if (prm->req_fback) {
+		if (usb_ep_dequeue(ep, prm->req_fback)) {
+			kfree(prm->req_fback->buf);
+			usb_ep_free_request(ep, prm->req_fback);
+		}
+		prm->req_fback = NULL;
+	}
+
+	if (usb_ep_disable(ep))
+		dev_err(uac->card->dev, "%s:%d Error!\n", __func__, __LINE__);
+}
+
+static void set_active(struct uac_rtd_params *prm, bool active)
+{
+	// notifying through the Rate ctrl
+	struct snd_kcontrol *kctl = prm->snd_kctl_rate;
+	unsigned long flags;
+
+	spin_lock_irqsave(&prm->lock, flags);
+	if (prm->active != active) {
+		prm->active = active;
+		snd_ctl_notify(prm->uac->card, SNDRV_CTL_EVENT_MASK_VALUE,
+				&kctl->id);
+	}
+	spin_unlock_irqrestore(&prm->lock, flags);
 }
 
 int u_audio_set_capture_srate(struct g_audio *audio_dev, int srate)
 {
-	struct snd_kcontrol *ctl = u_audio_get_ctl(audio_dev, "Capture Rate");
 	struct uac_params *params = &audio_dev->params;
+	struct snd_uac_chip *uac = audio_dev->uac;
+	struct uac_rtd_params *prm;
 	int i;
+	unsigned long flags;
 
+	dev_dbg(&audio_dev->gadget->dev, "%s: srate %d\n", __func__, srate);
+	prm = &uac->c_prm;
 	for (i = 0; i < UAC_MAX_RATES; i++) {
-		if (params->c_srate[i] == srate) {
+		if (params->c_srates[i] == srate) {
+			spin_lock_irqsave(&prm->lock, flags);
+			prm->srate = srate;
 			audio_dev->usb_state[SET_SAMPLE_RATE_OUT] = true;
 			schedule_work(&audio_dev->work);
-
-			params->c_srate_active = srate;
-			snd_ctl_notify(audio_dev->uac->card,
-					SNDRV_CTL_EVENT_MASK_VALUE, &ctl->id);
+			spin_unlock_irqrestore(&prm->lock, flags);
 			return 0;
 		}
-		if (params->c_srate[i] == 0)
+		if (params->c_srates[i] == 0)
 			break;
 	}
 
@@ -458,62 +537,40 @@
 }
 EXPORT_SYMBOL_GPL(u_audio_set_capture_srate);
 
-static void u_audio_set_playback_pktsize(struct g_audio *audio_dev, int srate)
+int u_audio_get_capture_srate(struct g_audio *audio_dev, u32 *val)
 {
-	struct uac_params *params = &audio_dev->params;
 	struct snd_uac_chip *uac = audio_dev->uac;
-	struct usb_gadget *gadget = audio_dev->gadget;
-	const struct usb_endpoint_descriptor *ep_desc;
 	struct uac_rtd_params *prm;
-	unsigned int factor;
+	unsigned long flags;
 
-	prm = &uac->p_prm;
-	/* set srate before starting playback, epin is not configured */
-	if (!prm->ep_enabled)
-		return;
-
-	ep_desc = audio_dev->in_ep->desc;
-
-	/* pre-calculate the playback endpoint's interval */
-	if (gadget->speed == USB_SPEED_FULL)
-		factor = 1000;
-	else
-		factor = 8000;
-
-	/* pre-compute some values for iso_complete() */
-	uac->p_framesize = params->p_ssize *
-			    num_channels(params->p_chmask);
-	uac->p_interval = factor / (1 << (ep_desc->bInterval - 1));
-	uac->p_pktsize = min_t(unsigned int,
-				uac->p_framesize *
-				(params->p_srate_active / uac->p_interval),
-				prm->max_psize);
-
-	if (uac->p_pktsize < prm->max_psize)
-		uac->p_pktsize_residue = uac->p_framesize *
-			(params->p_srate_active % uac->p_interval);
-	else
-		uac->p_pktsize_residue = 0;
+	prm = &uac->c_prm;
+	spin_lock_irqsave(&prm->lock, flags);
+	*val = prm->srate;
+	spin_unlock_irqrestore(&prm->lock, flags);
+	return 0;
 }
+EXPORT_SYMBOL_GPL(u_audio_get_capture_srate);
 
 int u_audio_set_playback_srate(struct g_audio *audio_dev, int srate)
 {
-	struct snd_kcontrol *ctl = u_audio_get_ctl(audio_dev, "Playback Rate");
 	struct uac_params *params = &audio_dev->params;
+	struct snd_uac_chip *uac = audio_dev->uac;
+	struct uac_rtd_params *prm;
 	int i;
+	unsigned long flags;
 
+	dev_dbg(&audio_dev->gadget->dev, "%s: srate %d\n", __func__, srate);
+	prm = &uac->p_prm;
 	for (i = 0; i < UAC_MAX_RATES; i++) {
-		if (params->p_srate[i] == srate) {
+		if (params->p_srates[i] == srate) {
+			spin_lock_irqsave(&prm->lock, flags);
+			prm->srate = srate;
 			audio_dev->usb_state[SET_SAMPLE_RATE_IN] = true;
 			schedule_work(&audio_dev->work);
-
-			params->p_srate_active = srate;
-			u_audio_set_playback_pktsize(audio_dev, srate);
-			snd_ctl_notify(audio_dev->uac->card,
-					SNDRV_CTL_EVENT_MASK_VALUE, &ctl->id);
+			spin_unlock_irqrestore(&prm->lock, flags);
 			return 0;
 		}
-		if (params->p_srate[i] == 0)
+		if (params->p_srates[i] == 0)
 			break;
 	}
 
@@ -521,13 +578,27 @@
 }
 EXPORT_SYMBOL_GPL(u_audio_set_playback_srate);
 
+int u_audio_get_playback_srate(struct g_audio *audio_dev, u32 *val)
+{
+	struct snd_uac_chip *uac = audio_dev->uac;
+	struct uac_rtd_params *prm;
+	unsigned long flags;
+
+	prm = &uac->p_prm;
+	spin_lock_irqsave(&prm->lock, flags);
+	*val = prm->srate;
+	spin_unlock_irqrestore(&prm->lock, flags);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(u_audio_get_playback_srate);
+
 int u_audio_start_capture(struct g_audio *audio_dev)
 {
 	struct snd_uac_chip *uac = audio_dev->uac;
 	struct usb_gadget *gadget = audio_dev->gadget;
 	struct device *dev = &gadget->dev;
-	struct usb_request *req;
-	struct usb_ep *ep;
+	struct usb_request *req, *req_fback;
+	struct usb_ep *ep, *ep_fback;
 	struct uac_rtd_params *prm;
 	struct uac_params *params = &audio_dev->params;
 	int req_len, i;
@@ -545,33 +616,72 @@
 	audio_dev->stream_state[STATE_OUT] = true;
 	schedule_work(&audio_dev->work);
 
-	ep = audio_dev->out_ep;
 	prm = &uac->c_prm;
+	dev_dbg(dev, "start capture with rate %d\n", prm->srate);
+	ep = audio_dev->out_ep;
 	config_ep_by_speed(gadget, &audio_dev->func, ep);
-	req_len = prm->max_psize;
+	req_len = ep->maxpacket;
 
 	prm->ep_enabled = true;
 	usb_ep_enable(ep);
 
 	for (i = 0; i < params->req_number; i++) {
-		if (!prm->ureq[i].req) {
+		if (!prm->reqs[i]) {
 			req = usb_ep_alloc_request(ep, GFP_ATOMIC);
 			if (req == NULL)
 				return -ENOMEM;
 
-			prm->ureq[i].req = req;
-			prm->ureq[i].pp = prm;
+			prm->reqs[i] = req;
 
 			req->zero = 0;
-			req->context = &prm->ureq[i];
+			req->context = prm;
 			req->length = req_len;
 			req->complete = u_audio_iso_complete;
-			req->buf = prm->rbuf + i * prm->max_psize;
+			req->buf = prm->rbuf + i * ep->maxpacket;
 		}
 
-		if (usb_ep_queue(ep, prm->ureq[i].req, GFP_ATOMIC))
+		if (usb_ep_queue(ep, prm->reqs[i], GFP_ATOMIC))
 			dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 	}
+
+	set_active(&uac->c_prm, true);
+
+	ep_fback = audio_dev->in_ep_fback;
+	if (!ep_fback)
+		return 0;
+
+	/* Setup feedback endpoint */
+	config_ep_by_speed(gadget, &audio_dev->func, ep_fback);
+	prm->fb_ep_enabled = true;
+	usb_ep_enable(ep_fback);
+	req_len = ep_fback->maxpacket;
+
+	req_fback = usb_ep_alloc_request(ep_fback, GFP_ATOMIC);
+	if (req_fback == NULL)
+		return -ENOMEM;
+
+	prm->req_fback = req_fback;
+	req_fback->zero = 0;
+	req_fback->context = prm;
+	req_fback->length = req_len;
+	req_fback->complete = u_audio_iso_fback_complete;
+
+	req_fback->buf = kzalloc(req_len, GFP_ATOMIC);
+	if (!req_fback->buf)
+		return -ENOMEM;
+
+	/*
+	 * Configure the feedback endpoint's reported frequency.
+	 * Always start with original frequency since its deviation can't
+	 * be meauserd at start of playback
+	 */
+	prm->pitch = 1000000;
+	u_audio_set_fback_frequency(audio_dev->gadget->speed, ep,
+				    prm->srate, prm->pitch,
+				    req_fback->buf);
+
+	if (usb_ep_queue(ep_fback, req_fback, GFP_ATOMIC))
+		dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 
 	return 0;
 }
@@ -581,6 +691,9 @@
 {
 	struct snd_uac_chip *uac = audio_dev->uac;
 
+	set_active(&uac->c_prm, false);
+	if (audio_dev->in_ep_fback)
+		free_ep_fback(&uac->c_prm, audio_dev->in_ep_fback);
 	free_ep(&uac->c_prm, audio_dev->out_ep);
 
 	audio_dev->usb_state[SET_INTERFACE_OUT] = true;
@@ -593,12 +706,15 @@
 {
 	struct snd_uac_chip *uac = audio_dev->uac;
 	struct usb_gadget *gadget = audio_dev->gadget;
-	struct device *dev = audio_dev->device;
+	struct device *dev = &gadget->dev;
 	struct usb_request *req;
 	struct usb_ep *ep;
 	struct uac_rtd_params *prm;
 	struct uac_params *params = &audio_dev->params;
+	unsigned int factor;
+	const struct usb_endpoint_descriptor *ep_desc;
 	int req_len, i;
+	unsigned int p_pktsize;
 
 	/*
 	 * For better compatibility on some PC Hosts which
@@ -613,37 +729,58 @@
 	audio_dev->stream_state[STATE_IN] = true;
 	schedule_work(&audio_dev->work);
 
-	dev_dbg(dev, "start playback with rate %d\n", params->p_srate_active);
-	ep = audio_dev->in_ep;
 	prm = &uac->p_prm;
+	dev_dbg(dev, "start playback with rate %d\n", prm->srate);
+	ep = audio_dev->in_ep;
 	config_ep_by_speed(gadget, &audio_dev->func, ep);
+
+	ep_desc = ep->desc;
+	/*
+	 * Always start with original frequency
+	 */
+	prm->pitch = 1000000;
+
+	/* pre-calculate the playback endpoint's interval */
+	if (gadget->speed == USB_SPEED_FULL)
+		factor = 1000;
+	else
+		factor = 8000;
+
+	/* pre-compute some values for iso_complete() */
+	uac->p_framesize = params->p_ssize *
+			    num_channels(params->p_chmask);
+	uac->p_interval = factor / (1 << (ep_desc->bInterval - 1));
+	p_pktsize = min_t(unsigned int,
+				uac->p_framesize *
+					(prm->srate / uac->p_interval),
+				ep->maxpacket);
+
+	req_len = p_pktsize;
+	uac->p_residue_mil = 0;
 
 	prm->ep_enabled = true;
 	usb_ep_enable(ep);
 
-	u_audio_set_playback_pktsize(audio_dev, params->p_srate_active);
-	req_len = uac->p_pktsize;
-	uac->p_residue = 0;
-
 	for (i = 0; i < params->req_number; i++) {
-		if (!prm->ureq[i].req) {
+		if (!prm->reqs[i]) {
 			req = usb_ep_alloc_request(ep, GFP_ATOMIC);
 			if (req == NULL)
 				return -ENOMEM;
 
-			prm->ureq[i].req = req;
-			prm->ureq[i].pp = prm;
+			prm->reqs[i] = req;
 
 			req->zero = 0;
-			req->context = &prm->ureq[i];
+			req->context = prm;
 			req->length = req_len;
 			req->complete = u_audio_iso_complete;
-			req->buf = prm->rbuf + i * prm->max_psize;
+			req->buf = prm->rbuf + i * ep->maxpacket;
 		}
 
-		if (usb_ep_queue(ep, prm->ureq[i].req, GFP_ATOMIC))
+		if (usb_ep_queue(ep, prm->reqs[i], GFP_ATOMIC))
 			dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 	}
+
+	set_active(&uac->p_prm, true);
 
 	return 0;
 }
@@ -653,6 +790,7 @@
 {
 	struct snd_uac_chip *uac = audio_dev->uac;
 
+	set_active(&uac->p_prm, false);
 	free_ep(&uac->p_prm, audio_dev->in_ep);
 
 	audio_dev->usb_state[SET_INTERFACE_IN] = true;
@@ -661,57 +799,424 @@
 }
 EXPORT_SYMBOL_GPL(u_audio_stop_playback);
 
-int u_audio_fu_set_cmd(struct usb_audio_control *con, u8 cmd, int value)
+void u_audio_suspend(struct g_audio *audio_dev)
 {
-	struct g_audio *audio_dev = (struct g_audio *)con->context;
-	struct uac_params *params = &audio_dev->params;
+	struct snd_uac_chip *uac = audio_dev->uac;
 
-	switch (cmd) {
-	case UAC_SET_CUR:
-		if (!strncmp(con->name, "Capture Mute", 12)) {
-			params->c_mute = value;
-			audio_dev->usb_state[SET_MUTE_OUT] = true;
-		} else if (!strncmp(con->name, "Capture Volume", 14)) {
-			params->c_volume = value;
-			audio_dev->usb_state[SET_VOLUME_OUT] = true;
-		} else if (!strncmp(con->name, "Playback Mute", 13)) {
-			params->p_mute = value;
-			audio_dev->usb_state[SET_MUTE_IN] = true;
-		} else if (!strncmp(con->name, "Playback Volume", 15)) {
-			params->p_volume = value;
-			audio_dev->usb_state[SET_VOLUME_IN] = true;
-		}
-		break;
-	case UAC_SET_RES:
-		/* fall through */
-	default:
-		return 0;
-	}
+	set_active(&uac->p_prm, false);
+	set_active(&uac->c_prm, false);
+}
+EXPORT_SYMBOL_GPL(u_audio_suspend);
 
-	con->data[cmd] = value;
-	schedule_work(&audio_dev->work);
+int u_audio_get_volume(struct g_audio *audio_dev, int playback, s16 *val)
+{
+	struct snd_uac_chip *uac = audio_dev->uac;
+	struct uac_rtd_params *prm;
+	unsigned long flags;
+
+	if (playback)
+		prm = &uac->p_prm;
+	else
+		prm = &uac->c_prm;
+
+	spin_lock_irqsave(&prm->lock, flags);
+	*val = prm->volume;
+	spin_unlock_irqrestore(&prm->lock, flags);
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(u_audio_fu_set_cmd);
+EXPORT_SYMBOL_GPL(u_audio_get_volume);
 
-int u_audio_fu_get_cmd(struct usb_audio_control *con, u8 cmd)
+int u_audio_set_volume(struct g_audio *audio_dev, int playback, s16 val)
 {
-	struct g_audio *audio_dev = (struct g_audio *)con->context;
+	struct snd_uac_chip *uac = audio_dev->uac;
+	struct uac_rtd_params *prm;
+	unsigned long flags;
+	int change = 0;
 
-	dev_dbg(audio_dev->device, "GET_CMD con %s cmd %d data %d\n",
-		con->name, cmd, (int16_t)con->data[cmd]);
-	return con->data[cmd];
+	if (playback)
+		prm = &uac->p_prm;
+	else
+		prm = &uac->c_prm;
+
+	spin_lock_irqsave(&prm->lock, flags);
+	val = clamp(val, prm->volume_min, prm->volume_max);
+	if (prm->volume != val) {
+		prm->volume = val;
+		change = 1;
+	}
+	spin_unlock_irqrestore(&prm->lock, flags);
+
+	if (change) {
+		if (playback)
+			audio_dev->usb_state[SET_VOLUME_IN] = true;
+		else
+			audio_dev->usb_state[SET_VOLUME_OUT] = true;
+		schedule_work(&audio_dev->work);
+
+		snd_ctl_notify(uac->card, SNDRV_CTL_EVENT_MASK_VALUE,
+				&prm->snd_kctl_volume->id);
+	}
+
+	return 0;
 }
-EXPORT_SYMBOL_GPL(u_audio_fu_get_cmd);
+EXPORT_SYMBOL_GPL(u_audio_set_volume);
+
+int u_audio_get_mute(struct g_audio *audio_dev, int playback, int *val)
+{
+	struct snd_uac_chip *uac = audio_dev->uac;
+	struct uac_rtd_params *prm;
+	unsigned long flags;
+
+	if (playback)
+		prm = &uac->p_prm;
+	else
+		prm = &uac->c_prm;
+
+	spin_lock_irqsave(&prm->lock, flags);
+	*val = prm->mute;
+	spin_unlock_irqrestore(&prm->lock, flags);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(u_audio_get_mute);
+
+int u_audio_set_mute(struct g_audio *audio_dev, int playback, int val)
+{
+	struct snd_uac_chip *uac = audio_dev->uac;
+	struct uac_rtd_params *prm;
+	unsigned long flags;
+	int change = 0;
+	int mute;
+
+	if (playback)
+		prm = &uac->p_prm;
+	else
+		prm = &uac->c_prm;
+
+	mute = val ? 1 : 0;
+
+	spin_lock_irqsave(&prm->lock, flags);
+	if (prm->mute != mute) {
+		prm->mute = mute;
+		change = 1;
+	}
+	spin_unlock_irqrestore(&prm->lock, flags);
+
+	if (change) {
+		if (playback)
+			audio_dev->usb_state[SET_MUTE_IN] = true;
+		else
+			audio_dev->usb_state[SET_MUTE_OUT] = true;
+		schedule_work(&audio_dev->work);
+
+		snd_ctl_notify(uac->card, SNDRV_CTL_EVENT_MASK_VALUE,
+			       &prm->snd_kctl_mute->id);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(u_audio_set_mute);
+
+
+static int u_audio_pitch_info(struct snd_kcontrol *kcontrol,
+				   struct snd_ctl_elem_info *uinfo)
+{
+	struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
+	struct snd_uac_chip *uac = prm->uac;
+	struct g_audio *audio_dev = uac->audio_dev;
+	struct uac_params *params = &audio_dev->params;
+	unsigned int pitch_min, pitch_max;
+
+	pitch_min = (1000 - FBACK_SLOW_MAX) * 1000;
+	pitch_max = (1000 + params->fb_max) * 1000;
+
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->count = 1;
+	uinfo->value.integer.min = pitch_min;
+	uinfo->value.integer.max = pitch_max;
+	uinfo->value.integer.step = 1;
+	return 0;
+}
+
+static int u_audio_pitch_get(struct snd_kcontrol *kcontrol,
+				   struct snd_ctl_elem_value *ucontrol)
+{
+	struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
+
+	ucontrol->value.integer.value[0] = prm->pitch;
+
+	return 0;
+}
+
+static int u_audio_pitch_put(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_value *ucontrol)
+{
+	struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
+	struct snd_uac_chip *uac = prm->uac;
+	struct g_audio *audio_dev = uac->audio_dev;
+	struct uac_params *params = &audio_dev->params;
+	unsigned int val;
+	unsigned int pitch_min, pitch_max;
+	int change = 0;
+
+	pitch_min = (1000 - FBACK_SLOW_MAX) * 1000;
+	pitch_max = (1000 + params->fb_max) * 1000;
+
+	val = ucontrol->value.integer.value[0];
+
+	if (val < pitch_min)
+		val = pitch_min;
+	if (val > pitch_max)
+		val = pitch_max;
+
+	if (prm->pitch != val) {
+		prm->pitch = val;
+		change = 1;
+	}
+
+	return change;
+}
+
+static int u_audio_mute_info(struct snd_kcontrol *kcontrol,
+				   struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
+	uinfo->count = 1;
+	uinfo->value.integer.min = 0;
+	uinfo->value.integer.max = 1;
+	uinfo->value.integer.step = 1;
+
+	return 0;
+}
+
+static int u_audio_mute_get(struct snd_kcontrol *kcontrol,
+				   struct snd_ctl_elem_value *ucontrol)
+{
+	struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
+	unsigned long flags;
+
+	spin_lock_irqsave(&prm->lock, flags);
+	ucontrol->value.integer.value[0] = !prm->mute;
+	spin_unlock_irqrestore(&prm->lock, flags);
+
+	return 0;
+}
+
+static int u_audio_mute_put(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_value *ucontrol)
+{
+	struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
+	struct snd_uac_chip *uac = prm->uac;
+	struct g_audio *audio_dev = uac->audio_dev;
+	unsigned int val;
+	unsigned long flags;
+	int change = 0;
+
+	val = !ucontrol->value.integer.value[0];
+
+	spin_lock_irqsave(&prm->lock, flags);
+	if (val != prm->mute) {
+		prm->mute = val;
+		change = 1;
+	}
+	spin_unlock_irqrestore(&prm->lock, flags);
+
+	if (change && audio_dev->notify)
+		audio_dev->notify(audio_dev, prm->fu_id, UAC_FU_MUTE);
+
+	return change;
+}
+
+/*
+ * TLV callback for mixer volume controls
+ */
+static int u_audio_volume_tlv(struct snd_kcontrol *kcontrol, int op_flag,
+			 unsigned int size, unsigned int __user *_tlv)
+{
+	struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
+	DECLARE_TLV_DB_MINMAX(scale, 0, 0);
+
+	if (size < sizeof(scale))
+		return -ENOMEM;
+
+	/* UAC volume resolution is 1/256 dB, TLV is 1/100 dB */
+	scale[2] = (prm->volume_min * 100) / 256;
+	scale[3] = (prm->volume_max * 100) / 256;
+	if (copy_to_user(_tlv, scale, sizeof(scale)))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int u_audio_volume_info(struct snd_kcontrol *kcontrol,
+				   struct snd_ctl_elem_info *uinfo)
+{
+	struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
+
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->count = 1;
+	uinfo->value.integer.min = 0;
+	uinfo->value.integer.max =
+		(prm->volume_max - prm->volume_min + prm->volume_res - 1)
+		/ prm->volume_res;
+	uinfo->value.integer.step = 1;
+
+	return 0;
+}
+
+static int u_audio_volume_get(struct snd_kcontrol *kcontrol,
+				   struct snd_ctl_elem_value *ucontrol)
+{
+	struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
+	unsigned long flags;
+
+	spin_lock_irqsave(&prm->lock, flags);
+	ucontrol->value.integer.value[0] =
+			(prm->volume - prm->volume_min) / prm->volume_res;
+	spin_unlock_irqrestore(&prm->lock, flags);
+
+	return 0;
+}
+
+static int u_audio_volume_put(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_value *ucontrol)
+{
+	struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
+	struct snd_uac_chip *uac = prm->uac;
+	struct g_audio *audio_dev = uac->audio_dev;
+	unsigned int val;
+	s16 volume;
+	unsigned long flags;
+	int change = 0;
+
+	val = ucontrol->value.integer.value[0];
+
+	spin_lock_irqsave(&prm->lock, flags);
+	volume = (val * prm->volume_res) + prm->volume_min;
+	volume = clamp(volume, prm->volume_min, prm->volume_max);
+	if (volume != prm->volume) {
+		prm->volume = volume;
+		change = 1;
+	}
+	spin_unlock_irqrestore(&prm->lock, flags);
+
+	if (change && audio_dev->notify)
+		audio_dev->notify(audio_dev, prm->fu_id, UAC_FU_VOLUME);
+
+	return change;
+}
+
+static int get_max_srate(const int *srates)
+{
+	int i, max_srate = 0;
+
+	for (i = 0; i < UAC_MAX_RATES; i++) {
+		if (srates[i] == 0)
+			break;
+		if (srates[i] > max_srate)
+			max_srate = srates[i];
+	}
+	return max_srate;
+}
+
+static int get_min_srate(const int *srates)
+{
+	int i, min_srate = INT_MAX;
+
+	for (i = 0; i < UAC_MAX_RATES; i++) {
+		if (srates[i] == 0)
+			break;
+		if (srates[i] < min_srate)
+			min_srate = srates[i];
+	}
+	return min_srate;
+}
+
+static int u_audio_rate_info(struct snd_kcontrol *kcontrol,
+				struct snd_ctl_elem_info *uinfo)
+{
+	const int *srates;
+	struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
+	struct snd_uac_chip *uac = prm->uac;
+	struct g_audio *audio_dev = uac->audio_dev;
+	struct uac_params *params = &audio_dev->params;
+
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->count = 1;
+
+	if (prm == &uac->c_prm)
+		srates = params->c_srates;
+	else
+		srates = params->p_srates;
+	uinfo->value.integer.min = get_min_srate(srates);
+	uinfo->value.integer.max = get_max_srate(srates);
+	return 0;
+}
+
+static int u_audio_rate_get(struct snd_kcontrol *kcontrol,
+						 struct snd_ctl_elem_value *ucontrol)
+{
+	struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
+	unsigned long flags;
+
+	spin_lock_irqsave(&prm->lock, flags);
+	if (prm->active)
+		ucontrol->value.integer.value[0] = prm->srate;
+	else
+		/* not active: reporting zero rate */
+		ucontrol->value.integer.value[0] = 0;
+	spin_unlock_irqrestore(&prm->lock, flags);
+	return 0;
+}
+
+static struct snd_kcontrol_new u_audio_controls[]  = {
+  [UAC_FBACK_CTRL] {
+    .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
+    .name =         "Capture Pitch 1000000",
+    .info =         u_audio_pitch_info,
+    .get =          u_audio_pitch_get,
+    .put =          u_audio_pitch_put,
+  },
+	[UAC_P_PITCH_CTRL] {
+		.iface =        SNDRV_CTL_ELEM_IFACE_PCM,
+		.name =         "Playback Pitch 1000000",
+		.info =         u_audio_pitch_info,
+		.get =          u_audio_pitch_get,
+		.put =          u_audio_pitch_put,
+	},
+  [UAC_MUTE_CTRL] {
+		.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
+		.name =		"", /* will be filled later */
+		.info =		u_audio_mute_info,
+		.get =		u_audio_mute_get,
+		.put =		u_audio_mute_put,
+	},
+	[UAC_VOLUME_CTRL] {
+		.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
+		.name =		"", /* will be filled later */
+		.info =		u_audio_volume_info,
+		.get =		u_audio_volume_get,
+		.put =		u_audio_volume_put,
+	},
+	[UAC_RATE_CTRL] {
+		.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
+		.name =		"", /* will be filled later */
+		.access =	SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
+		.info =		u_audio_rate_info,
+		.get =		u_audio_rate_get,
+	},
+};
 
 static void g_audio_work(struct work_struct *data)
 {
 	struct g_audio *audio = container_of(data, struct g_audio, work);
-	struct uac_params *params = &audio->params;
+	struct usb_gadget *gadget = audio->gadget;
+	struct snd_uac_chip *uac = audio->uac;
+	struct uac_rtd_params *prm;
+	struct device *dev = &gadget->dev;
 	char *uac_event[4]  = { NULL, NULL, NULL, NULL };
 	char str[19];
-	signed short volume;
 	int i;
 
 	for (i = 0; i < SET_USB_STATE_MAX; i++) {
@@ -734,48 +1239,50 @@
 		case SET_SAMPLE_RATE_OUT:
 			uac_event[0] = "USB_STATE=SET_SAMPLE_RATE";
 			uac_event[1] = "STREAM_DIRECTION=OUT";
+			prm = &uac->c_prm;
 			snprintf(str, sizeof(str), "SAMPLE_RATE=%d",
-						params->c_srate_active);
+				 prm->srate);
 			uac_event[2] = str;
 			break;
 		case SET_SAMPLE_RATE_IN:
 			uac_event[0] = "USB_STATE=SET_SAMPLE_RATE";
 			uac_event[1] = "STREAM_DIRECTION=IN";
+			prm = &uac->p_prm;
 			snprintf(str, sizeof(str), "SAMPLE_RATE=%d",
-						params->p_srate_active);
+				 prm->srate);
 			uac_event[2] = str;
 			break;
 		case SET_MUTE_OUT:
 			uac_event[0] = "USB_STATE=SET_MUTE";
 			uac_event[1] = "STREAM_DIRECTION=OUT";
-			snprintf(str, sizeof(str), "MUTE=%d", params->c_mute);
+			prm = &uac->c_prm;
+			snprintf(str, sizeof(str), "MUTE=%d", prm->mute);
 			uac_event[2] = str;
 			break;
 		case SET_MUTE_IN:
 			uac_event[0] = "USB_STATE=SET_MUTE";
 			uac_event[1] = "STREAM_DIRECTION=IN";
-			snprintf(str, sizeof(str), "MUTE=%d", params->p_mute);
+			prm = &uac->p_prm;
+			snprintf(str, sizeof(str), "MUTE=%d", prm->mute);
 			uac_event[2] = str;
 			break;
 		case SET_VOLUME_OUT:
 			uac_event[0] = "USB_STATE=SET_VOLUME";
 			uac_event[1] = "STREAM_DIRECTION=OUT";
-			volume = (signed short)params->c_volume;
-			volume /= UAC_VOLUME_RES;
-			snprintf(str, sizeof(str), "VOLUME=%d%%", volume + 50);
+			prm = &uac->c_prm;
+			snprintf(str, sizeof(str), "VOLUME=0x%hx", prm->volume);
 			uac_event[2] = str;
 			break;
 		case SET_VOLUME_IN:
 			uac_event[0] = "USB_STATE=SET_VOLUME";
 			uac_event[1] = "STREAM_DIRECTION=IN";
-			volume = (signed short)params->p_volume;
-			volume /= UAC_VOLUME_RES;
-			snprintf(str, sizeof(str), "VOLUME=%d%%", volume + 50);
+			prm = &uac->p_prm;
+			snprintf(str, sizeof(str), "VOLUME=0x%hx", prm->volume);
 			uac_event[2] = str;
 			break;
 		case SET_AUDIO_CLK:
 			uac_event[0] = "USB_STATE=SET_AUDIO_CLK";
-			snprintf(str, sizeof(str), "PPM=%d", params->ppm);
+			snprintf(str, sizeof(str), "PPM=%d", audio->params.ppm);
 			uac_event[1] = str;
 		default:
 			break;
@@ -784,8 +1291,8 @@
 		audio->usb_state[i] = false;
 		kobject_uevent_env(&audio->device->kobj, KOBJ_CHANGE,
 				   uac_event);
-		dev_dbg(audio->device, "%s: sent uac uevent %s %s %s\n",
-			__func__, uac_event[0], uac_event[1], uac_event[2]);
+		dev_dbg(dev, "%s: sent uac uevent %s %s %s\n", __func__,
+			uac_event[0], uac_event[1], uac_event[2]);
 	}
 }
 
@@ -896,10 +1403,10 @@
 	struct snd_uac_chip *uac;
 	struct snd_card *card;
 	struct snd_pcm *pcm;
+	struct snd_kcontrol *kctl;
 	struct uac_params *params;
 	int p_chmask, c_chmask;
-	int err;
-	int i;
+	int i, err;
 
 	if (!g_audio)
 		return -EINVAL;
@@ -923,12 +1430,15 @@
 	if (c_chmask) {
 		struct uac_rtd_params *prm = &uac->c_prm;
 
-		uac->c_prm.uac = uac;
+    spin_lock_init(&prm->lock);
+    uac->c_prm.uac = uac;
 		prm->max_psize = g_audio->out_ep_maxpsize;
+		prm->srate = params->c_srates[0];
 
-		prm->ureq = kcalloc(params->req_number, sizeof(struct uac_req),
-				GFP_KERNEL);
-		if (!prm->ureq) {
+		prm->reqs = kcalloc(params->req_number,
+				    sizeof(struct usb_request *),
+				    GFP_KERNEL);
+		if (!prm->reqs) {
 			err = -ENOMEM;
 			goto fail;
 		}
@@ -945,12 +1455,15 @@
 	if (p_chmask) {
 		struct uac_rtd_params *prm = &uac->p_prm;
 
+		spin_lock_init(&prm->lock);
 		uac->p_prm.uac = uac;
 		prm->max_psize = g_audio->in_ep_maxpsize;
+		prm->srate = params->p_srates[0];
 
-		prm->ureq = kcalloc(params->req_number, sizeof(struct uac_req),
-				GFP_KERNEL);
-		if (!prm->ureq) {
+		prm->reqs = kcalloc(params->req_number,
+				    sizeof(struct usb_request *),
+				    GFP_KERNEL);
+		if (!prm->reqs) {
 			err = -ENOMEM;
 			goto fail;
 		}
@@ -981,27 +1494,155 @@
 	if (err < 0)
 		goto snd_fail;
 
-	strlcpy(pcm->name, pcm_name, sizeof(pcm->name));
+	strscpy(pcm->name, pcm_name, sizeof(pcm->name));
 	pcm->private_data = uac;
 	uac->pcm = pcm;
 
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &uac_pcm_ops);
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &uac_pcm_ops);
 
-	strlcpy(card->driver, card_name, sizeof(card->driver));
-	strlcpy(card->shortname, card_name, sizeof(card->shortname));
-	sprintf(card->longname, "%s %i", card_name, card->dev->id);
+	/*
+	 * Create mixer and controls
+	 * Create only if it's required on USB side
+	 */
+	if ((c_chmask && g_audio->in_ep_fback)
+			|| (p_chmask && params->p_fu.id)
+			|| (c_chmask && params->c_fu.id))
+		strscpy(card->mixername, card_name, sizeof(card->driver));
 
-	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
-		snd_dma_continuous_data(GFP_KERNEL), 0, BUFF_SIZE_MAX);
+	if (c_chmask && g_audio->in_ep_fback) {
+		kctl = snd_ctl_new1(&u_audio_controls[UAC_FBACK_CTRL],
+				    &uac->c_prm);
+		if (!kctl) {
+			err = -ENOMEM;
+			goto snd_fail;
+		}
 
-	/* Add controls */
-	for (i = 0; i < ARRAY_SIZE(uac_pcm_controls); i++) {
-		err = snd_ctl_add(card,
-				snd_ctl_new1(&uac_pcm_controls[i], uac));
+		kctl->id.device = pcm->device;
+		kctl->id.subdevice = 0;
+
+		err = snd_ctl_add(card, kctl);
 		if (err < 0)
 			goto snd_fail;
 	}
+
+	if (p_chmask) {
+		kctl = snd_ctl_new1(&u_audio_controls[UAC_P_PITCH_CTRL],
+				    &uac->p_prm);
+		if (!kctl) {
+			err = -ENOMEM;
+			goto snd_fail;
+		}
+
+		kctl->id.device = pcm->device;
+		kctl->id.subdevice = 0;
+
+		err = snd_ctl_add(card, kctl);
+		if (err < 0)
+			goto snd_fail;
+	}
+
+	for (i = 0; i <= SNDRV_PCM_STREAM_LAST; i++) {
+		struct uac_rtd_params *prm;
+		struct uac_fu_params *fu;
+		char ctrl_name[24];
+		char *direction;
+
+		if (!pcm->streams[i].substream_count)
+			continue;
+
+		if (i == SNDRV_PCM_STREAM_PLAYBACK) {
+			prm = &uac->p_prm;
+			fu = &params->p_fu;
+			direction = "Playback";
+		} else {
+			prm = &uac->c_prm;
+			fu = &params->c_fu;
+			direction = "Capture";
+		}
+
+		prm->fu_id = fu->id;
+
+		if (fu->mute_present) {
+			snprintf(ctrl_name, sizeof(ctrl_name),
+					"PCM %s Switch", direction);
+
+			u_audio_controls[UAC_MUTE_CTRL].name = ctrl_name;
+
+			kctl = snd_ctl_new1(&u_audio_controls[UAC_MUTE_CTRL],
+					    prm);
+			if (!kctl) {
+				err = -ENOMEM;
+				goto snd_fail;
+			}
+
+			kctl->id.device = pcm->device;
+			kctl->id.subdevice = 0;
+
+			err = snd_ctl_add(card, kctl);
+			if (err < 0)
+				goto snd_fail;
+			prm->snd_kctl_mute = kctl;
+			prm->mute = 0;
+		}
+
+		if (fu->volume_present) {
+			snprintf(ctrl_name, sizeof(ctrl_name),
+					"PCM %s Volume", direction);
+
+			u_audio_controls[UAC_VOLUME_CTRL].name = ctrl_name;
+
+			kctl = snd_ctl_new1(&u_audio_controls[UAC_VOLUME_CTRL],
+					    prm);
+			if (!kctl) {
+				err = -ENOMEM;
+				goto snd_fail;
+			}
+
+			kctl->id.device = pcm->device;
+			kctl->id.subdevice = 0;
+
+
+			kctl->tlv.c = u_audio_volume_tlv;
+			kctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ |
+					SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
+
+			err = snd_ctl_add(card, kctl);
+			if (err < 0)
+				goto snd_fail;
+			prm->snd_kctl_volume = kctl;
+			prm->volume = fu->volume_max;
+			prm->volume_max = fu->volume_max;
+			prm->volume_min = fu->volume_min;
+			prm->volume_res = fu->volume_res;
+		}
+
+		/* Add rate control */
+		snprintf(ctrl_name, sizeof(ctrl_name),
+				"%s Rate", direction);
+		u_audio_controls[UAC_RATE_CTRL].name = ctrl_name;
+
+		kctl = snd_ctl_new1(&u_audio_controls[UAC_RATE_CTRL], prm);
+		if (!kctl) {
+			err = -ENOMEM;
+			goto snd_fail;
+		}
+
+		kctl->id.device = pcm->device;
+		kctl->id.subdevice = 0;
+
+		err = snd_ctl_add(card, kctl);
+		if (err < 0)
+			goto snd_fail;
+		prm->snd_kctl_rate = kctl;
+	}
+
+	strscpy(card->driver, card_name, sizeof(card->driver));
+	strscpy(card->shortname, card_name, sizeof(card->shortname));
+	sprintf(card->longname, "%s %i", card_name, card->dev->id);
+
+	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
+				       NULL, 0, BUFF_SIZE_MAX);
 
 	err = snd_card_register(card);
 	if (err < 0)
@@ -1024,8 +1665,8 @@
 snd_fail:
 	snd_card_free(card);
 fail:
-	kfree(uac->p_prm.ureq);
-	kfree(uac->c_prm.ureq);
+	kfree(uac->p_prm.reqs);
+	kfree(uac->c_prm.reqs);
 	kfree(uac->p_prm.rbuf);
 	kfree(uac->c_prm.rbuf);
 	kfree(uac);
@@ -1051,13 +1692,10 @@
 	uac = g_audio->uac;
 	card = uac->card;
 	if (card)
-		snd_card_free(card);
+		snd_card_free_when_closed(card);
 
-	free_ep(&uac->c_prm, g_audio->out_ep);
-	free_ep(&uac->p_prm, g_audio->in_ep);
-
-	kfree(uac->p_prm.ureq);
-	kfree(uac->c_prm.ureq);
+	kfree(uac->p_prm.reqs);
+	kfree(uac->c_prm.reqs);
 	kfree(uac->p_prm.rbuf);
 	kfree(uac->c_prm.rbuf);
 	kfree(uac);

--
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