sound/usb/line6/podhd.c - arm/linux - Git at Google

 /*
  * Line 6 Pod HD
  *
  * Copyright (C) 2011 Stefan Hajnoczi <stefanha@gmail.com>
  * Copyright (C) 2015 Andrej Krutak <dev@andree.sk>
  * Copyright (C) 2017 Hans P. Moller <hmoller@uc.cl>
  *
  *	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, version 2.
  *
  */

 #include <linux/usb.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <sound/core.h>
 #include <sound/pcm.h>

 #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,
 	LINE6_PODX3LIVE,
 	LINE6_PODHD500X
 };

 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 = {
 	.num_min = 48000,
 	.num_max = 48000,
 	.num_step = 1,
 	.den = 1,
 };

 static struct line6_pcm_properties podhd_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,
 				 .channels_min = 2,
 				 .channels_max = 2,
 				 .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 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 struct usb_driver podhd_driver;

 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_INFO) {
 		struct usb_interface *intf;

 		del_timer_sync(&pod->startup_timer);
 		cancel_work_sync(&pod->startup_work);

 		intf = usb_ifnum_to_if(line6->usbdev,
 					pod->line6.properties->ctrl_if);
 		usb_driver_release_interface(&podhd_driver, intf);
 	}
 }

 /*
 	Try to init POD HD device.
 */
 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;
 	struct usb_interface *intf;

 	line6->disconnect = podhd_disconnect;

 	if (pod->line6.properties->capabilities & LINE6_CAP_CONTROL) {
 		/* claim the data interface */
 		intf = usb_ifnum_to_if(line6->usbdev,
 					pod->line6.properties->ctrl_if);
 		if (!intf) {
 			dev_err(pod->line6.ifcdev, "interface %d not found\n",
 				pod->line6.properties->ctrl_if);
 			return -ENODEV;
 		}

 		err = usb_driver_claim_interface(&podhd_driver, intf, NULL);
 		if (err != 0) {
 			dev_err(pod->line6.ifcdev, "can't claim interface %d, error %d\n",
 				pod->line6.properties->ctrl_if, err);
 			return err;
 		}
 	}

 	if (pod->line6.properties->capabilities & LINE6_CAP_CONTROL_INFO) {
 		/* create sysfs entries: */
 		err = snd_card_add_dev_attr(line6->card, &podhd_dev_attr_group);
 		if (err < 0)
 			return err;
 	}

 	if (pod->line6.properties->capabilities & LINE6_CAP_PCM) {
 		/* initialize PCM subsystem: */
 		err = line6_init_pcm(line6,
 			(id->driver_info == LINE6_PODX3 ||
 			id->driver_info == LINE6_PODX3LIVE) ? &podx3_pcm_properties :
 			&podhd_pcm_properties);
 		if (err < 0)
 			return err;
 	}

 	if (!(pod->line6.properties->capabilities & LINE6_CAP_CONTROL_INFO)) {
 		/* 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)
 #define LINE6_IF_NUM(prod, n) USB_DEVICE_INTERFACE_NUMBER(0x0e41, prod, n)

 /* 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 },
 	{ LINE6_IF_NUM(0x414B, 0), .driver_info = LINE6_PODX3LIVE },
 	{ LINE6_IF_NUM(0x4159, 0), .driver_info = LINE6_PODHD500X },
 	{}
 };

 MODULE_DEVICE_TABLE(usb, podhd_id_table);

 static const struct line6_properties podhd_properties_table[] = {
 	[LINE6_PODHD300] = {
 		.id = "PODHD300",
 		.name = "POD HD300",
 		.capabilities	= LINE6_CAP_PCM
 				| LINE6_CAP_HWMON,
 		.altsetting = 5,
 		.ep_ctrl_r = 0x84,
 		.ep_ctrl_w = 0x03,
 		.ep_audio_r = 0x82,
 		.ep_audio_w = 0x01,
 	},
 	[LINE6_PODHD400] = {
 		.id = "PODHD400",
 		.name = "POD HD400",
 		.capabilities	= LINE6_CAP_PCM
 				| LINE6_CAP_HWMON,
 		.altsetting = 5,
 		.ep_ctrl_r = 0x84,
 		.ep_ctrl_w = 0x03,
 		.ep_audio_r = 0x82,
 		.ep_audio_w = 0x01,
 	},
 	[LINE6_PODHD500_0] = {
 		.id = "PODHD500",
 		.name = "POD HD500",
 		.capabilities	= LINE6_CAP_PCM
 				| LINE6_CAP_HWMON,
 		.altsetting = 1,
 		.ep_ctrl_r = 0x81,
 		.ep_ctrl_w = 0x01,
 		.ep_audio_r = 0x86,
 		.ep_audio_w = 0x02,
 	},
 	[LINE6_PODHD500_1] = {
 		.id = "PODHD500",
 		.name = "POD HD500",
 		.capabilities	= LINE6_CAP_PCM
 				| LINE6_CAP_HWMON,
 		.altsetting = 1,
 		.ep_ctrl_r = 0x81,
 		.ep_ctrl_w = 0x01,
 		.ep_audio_r = 0x86,
 		.ep_audio_w = 0x02,
 	},
 	[LINE6_PODX3] = {
 		.id = "PODX3",
 		.name = "POD X3",
 		.capabilities	= LINE6_CAP_CONTROL | LINE6_CAP_CONTROL_INFO
 				| LINE6_CAP_PCM | LINE6_CAP_HWMON | LINE6_CAP_IN_NEEDS_OUT,
 		.altsetting = 1,
 		.ep_ctrl_r = 0x81,
 		.ep_ctrl_w = 0x01,
 		.ctrl_if = 1,
 		.ep_audio_r = 0x86,
 		.ep_audio_w = 0x02,
 	},
 	[LINE6_PODX3LIVE] = {
 		.id = "PODX3LIVE",
 		.name = "POD X3 LIVE",
 		.capabilities	= LINE6_CAP_CONTROL | LINE6_CAP_CONTROL_INFO
 				| LINE6_CAP_PCM | LINE6_CAP_HWMON | LINE6_CAP_IN_NEEDS_OUT,
 		.altsetting = 1,
 		.ep_ctrl_r = 0x81,
 		.ep_ctrl_w = 0x01,
 		.ctrl_if = 1,
 		.ep_audio_r = 0x86,
 		.ep_audio_w = 0x02,
 	},
 	[LINE6_PODHD500X] = {
 		.id = "PODHD500X",
 		.name = "POD HD500X",
 		.capabilities	= LINE6_CAP_CONTROL
 				| LINE6_CAP_PCM | LINE6_CAP_HWMON,
 		.altsetting = 1,
 		.ep_ctrl_r = 0x81,
 		.ep_ctrl_w = 0x01,
 		.ctrl_if = 1,
 		.ep_audio_r = 0x86,
 		.ep_audio_w = 0x02,
 	},
 };

 /*
 	Probe USB device.
 */
 static int podhd_probe(struct usb_interface *interface,
 		       const struct usb_device_id *id)
 {
 	return line6_probe(interface, id, "Line6-PODHD",
 			   &podhd_properties_table[id->driver_info],
 			   podhd_init, sizeof(struct usb_line6_podhd));
 }

 static struct usb_driver podhd_driver = {
 	.name = KBUILD_MODNAME,
 	.probe = podhd_probe,
 	.disconnect = line6_disconnect,
 #ifdef CONFIG_PM
 	.suspend = line6_suspend,
 	.resume = line6_resume,
 	.reset_resume = line6_resume,
 #endif
 	.id_table = podhd_id_table,
 };

 module_usb_driver(podhd_driver);

 MODULE_DESCRIPTION("Line 6 PODHD USB driver");
 MODULE_LICENSE("GPL");
	/*
	* Line 6 Pod HD
	*
	* Copyright (C) 2011 Stefan Hajnoczi <stefanha@gmail.com>
	* Copyright (C) 2015 Andrej Krutak <dev@andree.sk>
	* Copyright (C) 2017 Hans P. Moller <hmoller@uc.cl>
	*
	* 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, version 2.
	*
	*/

	#include <linux/usb.h>
	#include <linux/slab.h>
	#include <linux/module.h>
	#include <sound/core.h>
	#include <sound/pcm.h>

	#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,
	LINE6_PODX3LIVE,
	LINE6_PODHD500X
	};

	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 = {
	.num_min = 48000,
	.num_max = 48000,
	.num_step = 1,
	.den = 1,
	};

	static struct line6_pcm_properties podhd_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,
	.channels_min = 2,
	.channels_max = 2,
	.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 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 struct usb_driver podhd_driver;

	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_INFO) {
	struct usb_interface *intf;

	del_timer_sync(&pod->startup_timer);
	cancel_work_sync(&pod->startup_work);

	intf = usb_ifnum_to_if(line6->usbdev,
	pod->line6.properties->ctrl_if);
	usb_driver_release_interface(&podhd_driver, intf);
	}
	}

	/*
	Try to init POD HD device.
	*/
	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;
	struct usb_interface *intf;

	line6->disconnect = podhd_disconnect;

	if (pod->line6.properties->capabilities & LINE6_CAP_CONTROL) {
	/* claim the data interface */
	intf = usb_ifnum_to_if(line6->usbdev,
	pod->line6.properties->ctrl_if);
	if (!intf) {
	dev_err(pod->line6.ifcdev, "interface %d not found\n",
	pod->line6.properties->ctrl_if);
	return -ENODEV;
	}

	err = usb_driver_claim_interface(&podhd_driver, intf, NULL);
	if (err != 0) {
	dev_err(pod->line6.ifcdev, "can't claim interface %d, error %d\n",
	pod->line6.properties->ctrl_if, err);
	return err;
	}
	}

	if (pod->line6.properties->capabilities & LINE6_CAP_CONTROL_INFO) {
	/* create sysfs entries: */
	err = snd_card_add_dev_attr(line6->card, &podhd_dev_attr_group);
	if (err < 0)
	return err;
	}

	if (pod->line6.properties->capabilities & LINE6_CAP_PCM) {
	/* initialize PCM subsystem: */
	err = line6_init_pcm(line6,
	(id->driver_info == LINE6_PODX3 \|\|
	id->driver_info == LINE6_PODX3LIVE) ? &podx3_pcm_properties :
	&podhd_pcm_properties);
	if (err < 0)
	return err;
	}

	if (!(pod->line6.properties->capabilities & LINE6_CAP_CONTROL_INFO)) {
	/* 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)
	#define LINE6_IF_NUM(prod, n) USB_DEVICE_INTERFACE_NUMBER(0x0e41, prod, n)

	/* 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 },
	{ LINE6_IF_NUM(0x414B, 0), .driver_info = LINE6_PODX3LIVE },
	{ LINE6_IF_NUM(0x4159, 0), .driver_info = LINE6_PODHD500X },
	{}
	};

	MODULE_DEVICE_TABLE(usb, podhd_id_table);

	static const struct line6_properties podhd_properties_table[] = {
	[LINE6_PODHD300] = {
	.id = "PODHD300",
	.name = "POD HD300",
	.capabilities = LINE6_CAP_PCM
	\| LINE6_CAP_HWMON,
	.altsetting = 5,
	.ep_ctrl_r = 0x84,
	.ep_ctrl_w = 0x03,
	.ep_audio_r = 0x82,
	.ep_audio_w = 0x01,
	},
	[LINE6_PODHD400] = {
	.id = "PODHD400",
	.name = "POD HD400",
	.capabilities = LINE6_CAP_PCM
	\| LINE6_CAP_HWMON,
	.altsetting = 5,
	.ep_ctrl_r = 0x84,
	.ep_ctrl_w = 0x03,
	.ep_audio_r = 0x82,
	.ep_audio_w = 0x01,
	},
	[LINE6_PODHD500_0] = {
	.id = "PODHD500",
	.name = "POD HD500",
	.capabilities = LINE6_CAP_PCM
	\| LINE6_CAP_HWMON,
	.altsetting = 1,
	.ep_ctrl_r = 0x81,
	.ep_ctrl_w = 0x01,
	.ep_audio_r = 0x86,
	.ep_audio_w = 0x02,
	},
	[LINE6_PODHD500_1] = {
	.id = "PODHD500",
	.name = "POD HD500",
	.capabilities = LINE6_CAP_PCM
	\| LINE6_CAP_HWMON,
	.altsetting = 1,
	.ep_ctrl_r = 0x81,
	.ep_ctrl_w = 0x01,
	.ep_audio_r = 0x86,
	.ep_audio_w = 0x02,
	},
	[LINE6_PODX3] = {
	.id = "PODX3",
	.name = "POD X3",
	.capabilities = LINE6_CAP_CONTROL \| LINE6_CAP_CONTROL_INFO
	\| LINE6_CAP_PCM \| LINE6_CAP_HWMON \| LINE6_CAP_IN_NEEDS_OUT,
	.altsetting = 1,
	.ep_ctrl_r = 0x81,
	.ep_ctrl_w = 0x01,
	.ctrl_if = 1,
	.ep_audio_r = 0x86,
	.ep_audio_w = 0x02,
	},
	[LINE6_PODX3LIVE] = {
	.id = "PODX3LIVE",
	.name = "POD X3 LIVE",
	.capabilities = LINE6_CAP_CONTROL \| LINE6_CAP_CONTROL_INFO
	\| LINE6_CAP_PCM \| LINE6_CAP_HWMON \| LINE6_CAP_IN_NEEDS_OUT,
	.altsetting = 1,
	.ep_ctrl_r = 0x81,
	.ep_ctrl_w = 0x01,
	.ctrl_if = 1,
	.ep_audio_r = 0x86,
	.ep_audio_w = 0x02,
	},
	[LINE6_PODHD500X] = {
	.id = "PODHD500X",
	.name = "POD HD500X",
	.capabilities = LINE6_CAP_CONTROL
	\| LINE6_CAP_PCM \| LINE6_CAP_HWMON,
	.altsetting = 1,
	.ep_ctrl_r = 0x81,
	.ep_ctrl_w = 0x01,
	.ctrl_if = 1,
	.ep_audio_r = 0x86,
	.ep_audio_w = 0x02,
	},
	};

	/*
	Probe USB device.
	*/
	static int podhd_probe(struct usb_interface *interface,
	const struct usb_device_id *id)
	{
	return line6_probe(interface, id, "Line6-PODHD",
	&podhd_properties_table[id->driver_info],
	podhd_init, sizeof(struct usb_line6_podhd));
	}

	static struct usb_driver podhd_driver = {
	.name = KBUILD_MODNAME,
	.probe = podhd_probe,
	.disconnect = line6_disconnect,
	#ifdef CONFIG_PM
	.suspend = line6_suspend,
	.resume = line6_resume,
	.reset_resume = line6_resume,
	#endif
	.id_table = podhd_id_table,
	};

	module_usb_driver(podhd_driver);

	MODULE_DESCRIPTION("Line 6 PODHD USB driver");
	MODULE_LICENSE("GPL");