diff --git a/sound/usb/line6/Kconfig b/sound/usb/line6/Kconfig
index f4585d37..8ffcf48 100644
--- a/sound/usb/line6/Kconfig
+++ b/sound/usb/line6/Kconfig
@@ -21,10 +21,10 @@ config SND_USB_POD
 	      re-amping)
 
 config SND_USB_PODHD
-	tristate "Line 6 POD HD300/400/500 USB support"
+	tristate "Line 6 POD X3/HD300/400/500 USB support"
 	select SND_USB_LINE6
 	help
-	  This is a driver for POD HD300, 400 and 500 devices.
+	  This is a driver for POD X3, HD300, 400 and 500 devices.
 
 config SND_USB_TONEPORT
 	tristate "TonePort GX, UX1 and UX2 USB support"
diff --git a/sound/usb/line6/podhd.c b/sound/usb/line6/podhd.c
index 4fc4789..8cf0a98 100644
--- a/sound/usb/line6/podhd.c
+++ b/sound/usb/line6/podhd.c
@@ -2,6 +2,7 @@
  * Line 6 Pod HD
  *
  * Copyright (C) 2011 Stefan Hajnoczi <stefanha@gmail.com>
+ * Copyright (C) 2015 Andrej Krutak <dev@andree.sk>
  *
  *	This program is free software; you can redistribute it and/or
  *	modify it under the terms of the GNU General Public License as
@@ -18,11 +19,44 @@
 #include "driver.h"
 #include "pcm.h"
 
+#define PODHD_STARTUP_DELAY 500
+
+/*
+ * Stages of POD startup procedure
+ */
+enum {
+	PODHD_STARTUP_INIT = 1,
+	PODHD_STARTUP_SCHEDULE_WORKQUEUE,
+	PODHD_STARTUP_SETUP,
+	PODHD_STARTUP_LAST = PODHD_STARTUP_SETUP - 1
+};
+
 enum {
 	LINE6_PODHD300,
 	LINE6_PODHD400,
 	LINE6_PODHD500_0,
 	LINE6_PODHD500_1,
+	LINE6_PODX3,
+};
+
+struct usb_line6_podhd {
+	/* Generic Line 6 USB data */
+	struct usb_line6 line6;
+
+	/* Timer for device initialization */
+	struct timer_list startup_timer;
+
+	/* Work handler for device initialization */
+	struct work_struct startup_work;
+
+	/* Current progress in startup procedure */
+	int startup_progress;
+
+	/* Serial number of device */
+	u32 serial_number;
+
+	/* Firmware version */
+	int firmware_version;
 };
 
 static struct snd_ratden podhd_ratden = {
@@ -71,9 +105,196 @@ static struct line6_pcm_properties podhd_pcm_properties = {
 	.rates = {
 			    .nrats = 1,
 			    .rats = &podhd_ratden},
-	.bytes_per_channel = 3 /* 24bit audio (stereo) */
+	.bytes_per_channel = 3 /* SNDRV_PCM_FMTBIT_S24_3LE */
 };
 
+static struct line6_pcm_properties podx3_pcm_properties = {
+	.playback_hw = {
+				  .info = (SNDRV_PCM_INFO_MMAP |
+					   SNDRV_PCM_INFO_INTERLEAVED |
+					   SNDRV_PCM_INFO_BLOCK_TRANSFER |
+					   SNDRV_PCM_INFO_MMAP_VALID |
+					   SNDRV_PCM_INFO_PAUSE |
+					   SNDRV_PCM_INFO_SYNC_START),
+				  .formats = SNDRV_PCM_FMTBIT_S24_3LE,
+				  .rates = SNDRV_PCM_RATE_48000,
+				  .rate_min = 48000,
+				  .rate_max = 48000,
+				  .channels_min = 2,
+				  .channels_max = 2,
+				  .buffer_bytes_max = 60000,
+				  .period_bytes_min = 64,
+				  .period_bytes_max = 8192,
+				  .periods_min = 1,
+				  .periods_max = 1024},
+	.capture_hw = {
+				 .info = (SNDRV_PCM_INFO_MMAP |
+					  SNDRV_PCM_INFO_INTERLEAVED |
+					  SNDRV_PCM_INFO_BLOCK_TRANSFER |
+					  SNDRV_PCM_INFO_MMAP_VALID |
+					  SNDRV_PCM_INFO_SYNC_START),
+				 .formats = SNDRV_PCM_FMTBIT_S24_3LE,
+				 .rates = SNDRV_PCM_RATE_48000,
+				 .rate_min = 48000,
+				 .rate_max = 48000,
+				 /* 1+2: Main signal (out), 3+4: Tone 1,
+				  * 5+6: Tone 2, 7+8: raw */
+				 .channels_min = 8,
+				 .channels_max = 8,
+				 .buffer_bytes_max = 60000,
+				 .period_bytes_min = 64,
+				 .period_bytes_max = 8192,
+				 .periods_min = 1,
+				 .periods_max = 1024},
+	.rates = {
+			    .nrats = 1,
+			    .rats = &podhd_ratden},
+	.bytes_per_channel = 3 /* SNDRV_PCM_FMTBIT_S24_3LE */
+};
+
+static void podhd_startup_start_workqueue(unsigned long data);
+static void podhd_startup_workqueue(struct work_struct *work);
+static int podhd_startup_finalize(struct usb_line6_podhd *pod);
+
+static ssize_t serial_number_show(struct device *dev,
+				  struct device_attribute *attr, char *buf)
+{
+	struct snd_card *card = dev_to_snd_card(dev);
+	struct usb_line6_podhd *pod = card->private_data;
+
+	return sprintf(buf, "%u\n", pod->serial_number);
+}
+
+static ssize_t firmware_version_show(struct device *dev,
+				     struct device_attribute *attr, char *buf)
+{
+	struct snd_card *card = dev_to_snd_card(dev);
+	struct usb_line6_podhd *pod = card->private_data;
+
+	return sprintf(buf, "%06x\n", pod->firmware_version);
+}
+
+static DEVICE_ATTR_RO(firmware_version);
+static DEVICE_ATTR_RO(serial_number);
+
+static struct attribute *podhd_dev_attrs[] = {
+	&dev_attr_firmware_version.attr,
+	&dev_attr_serial_number.attr,
+	NULL
+};
+
+static const struct attribute_group podhd_dev_attr_group = {
+	.name = "podhd",
+	.attrs = podhd_dev_attrs,
+};
+
+/*
+ * POD X3 startup procedure.
+ *
+ * May be compatible with other POD HD's, since it's also similar to the
+ * previous POD setup. In any case, it doesn't seem to be required for the
+ * audio nor bulk interfaces to work.
+ */
+
+static void podhd_startup(struct usb_line6_podhd *pod)
+{
+	CHECK_STARTUP_PROGRESS(pod->startup_progress, PODHD_STARTUP_INIT);
+
+	/* delay startup procedure: */
+	line6_start_timer(&pod->startup_timer, PODHD_STARTUP_DELAY,
+		podhd_startup_start_workqueue, (unsigned long)pod);
+}
+
+static void podhd_startup_start_workqueue(unsigned long data)
+{
+	struct usb_line6_podhd *pod = (struct usb_line6_podhd *)data;
+
+	CHECK_STARTUP_PROGRESS(pod->startup_progress,
+		PODHD_STARTUP_SCHEDULE_WORKQUEUE);
+
+	/* schedule work for global work queue: */
+	schedule_work(&pod->startup_work);
+}
+
+static int podhd_dev_start(struct usb_line6_podhd *pod)
+{
+	int ret;
+	u8 init_bytes[8];
+	int i;
+	struct usb_device *usbdev = pod->line6.usbdev;
+
+	ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0),
+					0x67, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
+					0x11, 0,
+					NULL, 0, LINE6_TIMEOUT * HZ);
+	if (ret < 0) {
+		dev_err(pod->line6.ifcdev, "read request failed (error %d)\n", ret);
+		return ret;
+	}
+
+	/* NOTE: looks like some kind of ping message */
+	ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0), 0x67,
+					USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
+					0x11, 0x0,
+					&init_bytes, 3, LINE6_TIMEOUT * HZ);
+	if (ret < 0) {
+		dev_err(pod->line6.ifcdev,
+			"receive length failed (error %d)\n", ret);
+		return ret;
+	}
+
+	pod->firmware_version =
+		(init_bytes[0] << 16) | (init_bytes[1] << 8) | (init_bytes[2] << 0);
+
+	for (i = 0; i <= 16; i++) {
+		ret = line6_read_data(&pod->line6, 0xf000 + 0x08 * i, init_bytes, 8);
+		if (ret < 0)
+			return ret;
+	}
+
+	ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0),
+					USB_REQ_SET_FEATURE,
+					USB_TYPE_STANDARD | USB_RECIP_DEVICE | USB_DIR_OUT,
+					1, 0,
+					NULL, 0, LINE6_TIMEOUT * HZ);
+	if (ret < 0) {
+		return ret;
+	}
+
+	return 0;
+}
+
+static void podhd_startup_workqueue(struct work_struct *work)
+{
+	struct usb_line6_podhd *pod =
+	    container_of(work, struct usb_line6_podhd, startup_work);
+
+	CHECK_STARTUP_PROGRESS(pod->startup_progress, PODHD_STARTUP_SETUP);
+
+	podhd_dev_start(pod);
+	line6_read_serial_number(&pod->line6, &pod->serial_number);
+
+	podhd_startup_finalize(pod);
+}
+
+static int podhd_startup_finalize(struct usb_line6_podhd *pod)
+{
+	struct usb_line6 *line6 = &pod->line6;
+
+	/* ALSA audio interface: */
+	return snd_card_register(line6->card);
+}
+
+static void podhd_disconnect(struct usb_line6 *line6)
+{
+	struct usb_line6_podhd *pod = (struct usb_line6_podhd *)line6;
+
+	if (pod->line6.properties->capabilities & LINE6_CAP_CONTROL) {
+		del_timer_sync(&pod->startup_timer);
+		cancel_work_sync(&pod->startup_work);
+	}
+}
+
 /*
 	Try to init POD HD device.
 */
@@ -81,6 +302,16 @@ static int podhd_init(struct usb_line6 *line6,
 		      const struct usb_device_id *id)
 {
 	int err;
+	struct usb_line6_podhd *pod = (struct usb_line6_podhd *) line6;
+
+	line6->disconnect = podhd_disconnect;
+
+	if (pod->line6.properties->capabilities & LINE6_CAP_CONTROL) {
+		/* create sysfs entries: */
+		err = snd_card_add_dev_attr(line6->card, &podhd_dev_attr_group);
+		if (err < 0)
+			return err;
+	}
 
 	/* initialize MIDI subsystem: */
 	err = line6_init_midi(line6);
@@ -88,12 +319,22 @@ static int podhd_init(struct usb_line6 *line6,
 		return err;
 
 	/* initialize PCM subsystem: */
-	err = line6_init_pcm(line6, &podhd_pcm_properties);
+	err = line6_init_pcm(line6,
+		(id->driver_info == LINE6_PODX3) ? &podx3_pcm_properties :
+		&podhd_pcm_properties);
 	if (err < 0)
 		return err;
 
-	/* register USB audio system: */
-	return snd_card_register(line6->card);
+	if (!(pod->line6.properties->capabilities & LINE6_CAP_CONTROL)) {
+		/* register USB audio system directly */
+		return podhd_startup_finalize(pod);
+	}
+
+	/* init device and delay registering */
+	init_timer(&pod->startup_timer);
+	INIT_WORK(&pod->startup_work, podhd_startup_workqueue);
+	podhd_startup(pod);
+	return 0;
 }
 
 #define LINE6_DEVICE(prod) USB_DEVICE(0x0e41, prod)
@@ -101,10 +342,12 @@ static int podhd_init(struct usb_line6 *line6,
 
 /* table of devices that work with this driver */
 static const struct usb_device_id podhd_id_table[] = {
+	/* TODO: no need to alloc data interfaces when only audio is used */
 	{ LINE6_DEVICE(0x5057),    .driver_info = LINE6_PODHD300 },
 	{ LINE6_DEVICE(0x5058),    .driver_info = LINE6_PODHD400 },
 	{ LINE6_IF_NUM(0x414D, 0), .driver_info = LINE6_PODHD500_0 },
 	{ LINE6_IF_NUM(0x414D, 1), .driver_info = LINE6_PODHD500_1 },
+	{ LINE6_IF_NUM(0x414A, 0), .driver_info = LINE6_PODX3 },
 	{}
 };
 
@@ -114,8 +357,7 @@ static const struct line6_properties podhd_properties_table[] = {
 	[LINE6_PODHD300] = {
 		.id = "PODHD300",
 		.name = "POD HD300",
-		.capabilities	= LINE6_CAP_CONTROL
-				| LINE6_CAP_PCM
+		.capabilities	= LINE6_CAP_PCM
 				| LINE6_CAP_HWMON,
 		.altsetting = 5,
 		.ep_ctrl_r = 0x84,
@@ -126,8 +368,7 @@ static const struct line6_properties podhd_properties_table[] = {
 	[LINE6_PODHD400] = {
 		.id = "PODHD400",
 		.name = "POD HD400",
-		.capabilities	= LINE6_CAP_CONTROL
-				| LINE6_CAP_PCM
+		.capabilities	= LINE6_CAP_PCM
 				| LINE6_CAP_HWMON,
 		.altsetting = 5,
 		.ep_ctrl_r = 0x84,
@@ -138,8 +379,7 @@ static const struct line6_properties podhd_properties_table[] = {
 	[LINE6_PODHD500_0] = {
 		.id = "PODHD500",
 		.name = "POD HD500",
-		.capabilities	= LINE6_CAP_CONTROL
-				| LINE6_CAP_PCM
+		.capabilities	= LINE6_CAP_PCM
 				| LINE6_CAP_HWMON,
 		.altsetting = 1,
 		.ep_ctrl_r = 0x81,
@@ -150,8 +390,7 @@ static const struct line6_properties podhd_properties_table[] = {
 	[LINE6_PODHD500_1] = {
 		.id = "PODHD500",
 		.name = "POD HD500",
-		.capabilities	= LINE6_CAP_CONTROL
-				| LINE6_CAP_PCM
+		.capabilities	= LINE6_CAP_PCM
 				| LINE6_CAP_HWMON,
 		.altsetting = 1,
 		.ep_ctrl_r = 0x81,
@@ -159,6 +398,17 @@ static const struct line6_properties podhd_properties_table[] = {
 		.ep_audio_r = 0x86,
 		.ep_audio_w = 0x02,
 	},
+	[LINE6_PODX3] = {
+		.id = "PODX3",
+		.name = "POD X3",
+		.capabilities	= LINE6_CAP_CONTROL
+				| LINE6_CAP_PCM | LINE6_CAP_HWMON | LINE6_CAP_IN_NEEDS_OUT,
+		.altsetting = 1,
+		.ep_ctrl_r = 0x81,
+		.ep_ctrl_w = 0x01,
+		.ep_audio_r = 0x86,
+		.ep_audio_w = 0x02,
+	},
 };
 
 /*
@@ -169,7 +419,7 @@ static int podhd_probe(struct usb_interface *interface,
 {
 	return line6_probe(interface, id, "Line6-PODHD",
 			   &podhd_properties_table[id->driver_info],
-			   podhd_init, sizeof(struct usb_line6));
+			   podhd_init, sizeof(struct usb_line6_podhd));
 }
 
 static struct usb_driver podhd_driver = {
