/*
   * usbusy2y.c - ALSA USB US-428 Driver
   *
  2005-04-14 Karsten Wiese
  	Version 0.8.7.2:
  	Call snd_card_free() instead of snd_card_free_in_thread() to prevent oops with dead keyboard symptom.
  	Tested ok with kernel 2.6.12-rc2.
  
  2004-12-14 Karsten Wiese
  	Version 0.8.7.1:
  	snd_pcm_open for rawusb pcm-devices now returns -EBUSY if called without rawusb's hwdep device being open.
  
  2004-12-02 Karsten Wiese
  	Version 0.8.7:
  	Use macro usb_maxpacket() for portability.
  
  2004-10-26 Karsten Wiese
  	Version 0.8.6:
  	wake_up() process waiting in usX2Y_urbs_start() on error.
  
  2004-10-21 Karsten Wiese
  	Version 0.8.5:
  	nrpacks is runtime or compiletime configurable now with tested values from 1 to 4.
  
  2004-10-03 Karsten Wiese
  	Version 0.8.2:
  	Avoid any possible racing while in prepare callback.
  
  2004-09-30 Karsten Wiese
  	Version 0.8.0:
  	Simplified things and made ohci work again.
  
  2004-09-20 Karsten Wiese
  	Version 0.7.3:
  	Use usb_kill_urb() instead of deprecated (kernel 2.6.9) usb_unlink_urb().
  
  2004-07-13 Karsten Wiese
  	Version 0.7.1:
  	Don't sleep in START/STOP callbacks anymore.
  	us428 channels C/D not handled just for this version, sorry.
  
  2004-06-21 Karsten Wiese
  	Version 0.6.4:
  	Temporarely suspend midi input
  	to sanely call usb_set_interface() when setting format.
  
  2004-06-12 Karsten Wiese
  	Version 0.6.3:
  	Made it thus the following rule is enforced:
  	"All pcm substreams of one usX2Y have to operate at the same rate & format."
  
  2004-04-06 Karsten Wiese
  	Version 0.6.0:
  	Runs on 2.6.5 kernel without any "--with-debug=" things.
  	us224 reported running.
  
  2004-01-14 Karsten Wiese
  	Version 0.5.1:
  	Runs with 2.6.1 kernel.
  
  2003-12-30 Karsten Wiese
  	Version 0.4.1:
  	Fix 24Bit 4Channel capturing for the us428.
  
  2003-11-27 Karsten Wiese, Martin Langer
  	Version 0.4:
  	us122 support.
  	us224 could be tested by uncommenting the sections containing USB_ID_US224
  
  2003-11-03 Karsten Wiese
  	Version 0.3:
  	24Bit support. 
  	"arecord -D hw:1 -c 2 -r 48000 -M -f S24_3LE|aplay -D hw:1 -c 2 -r 48000 -M -f S24_3LE" works.
  
  2003-08-22 Karsten Wiese
  	Version 0.0.8:
  	Removed EZUSB Firmware. First Stage Firmwaredownload is now done by tascam-firmware downloader.
  	See:
  	http://usb-midi-fw.sourceforge.net/tascam-firmware.tar.gz
  
  2003-06-18 Karsten Wiese
  	Version 0.0.5:
  	changed to compile with kernel 2.4.21 and alsa 0.9.4
  
  2002-10-16 Karsten Wiese
  	Version 0.0.4:
  	compiles again with alsa-current.
  	USB_ISO_ASAP not used anymore (most of the time), instead
  	urb->start_frame is calculated here now, some calls inside usb-driver don't need to happen anymore.
  
  	To get the best out of this:
  	Disable APM-support in the kernel as APM-BIOS calls (once each second) hard disable interrupt for many precious milliseconds.
  	This helped me much on my slowish PII 400 & PIII 500.
  	ACPI yet untested but might cause the same bad behaviour.
  	Use a kernel with lowlatency and preemptiv patches applied.
  	To autoload snd-usb-midi append a line 
  		post-install snd-usb-us428 modprobe snd-usb-midi
  	to /etc/modules.conf.
  
  	known problems:
  	sliders, knobs, lights not yet handled except MASTER Volume slider.
         	"pcm -c 2" doesn't work. "pcm -c 2 -m direct_interleaved" does.
  	KDE3: "Enable full duplex operation" deadlocks.
  
  	
  2002-08-31 Karsten Wiese
  	Version 0.0.3: audio also simplex;
  	simplifying: iso urbs only 1 packet, melted structs.
  	ASYNC_UNLINK not used anymore: no more crashes so far.....
  	for alsa 0.9 rc3.
  
  2002-08-09 Karsten Wiese
  	Version 0.0.2: midi works with snd-usb-midi, audio (only fullduplex now) with i.e. bristol.
  	The firmware has been sniffed from win2k us-428 driver 3.09.
  
   *   Copyright (c) 2002 - 2004 Karsten Wiese
   *
   *   This program is free software; you can redistribute it and/or modify
   *   it under the terms of the GNU General Public License as published by
   *   the Free Software Foundation; either version 2 of the License, or
   *   (at your option) any later version.
   *
   *   This program is distributed in the hope that it will be useful,
   *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *   GNU General Public License for more details.
   *
   *   You should have received a copy of the GNU General Public License
   *   along with this program; if not, write to the Free Software
   *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  */
  
  #include <linux/init.h>
  #include <linux/module.h>
  #include <linux/moduleparam.h>
  #include <linux/slab.h>
  #include <linux/interrupt.h>
  #include <linux/usb.h>
  #include <sound/core.h>
  #include <sound/initval.h>
  #include <sound/pcm.h>
  
  #include <sound/rawmidi.h>
  #include "usx2y.h"
  #include "usbusx2y.h"
  #include "usX2Yhwdep.h"
  
  
  
  MODULE_AUTHOR("Karsten Wiese <annabellesgarden@yahoo.de>");
  MODULE_DESCRIPTION("TASCAM "NAME_ALLCAPS" Version 0.8.7.2");
  MODULE_LICENSE("GPL");
  MODULE_SUPPORTED_DEVICE("{{TASCAM(0x1604),"NAME_ALLCAPS"(0x8001)(0x8005)(0x8007)}}");
  
  static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-max */
  static char* id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* Id for this card */
  static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP; /* Enable this card */
  
  module_param_array(index, int, NULL, 0444);
  MODULE_PARM_DESC(index, "Index value for "NAME_ALLCAPS".");
  module_param_array(id, charp, NULL, 0444);
  MODULE_PARM_DESC(id, "ID string for "NAME_ALLCAPS".");
  module_param_array(enable, bool, NULL, 0444);
  MODULE_PARM_DESC(enable, "Enable "NAME_ALLCAPS".");
  
  
  static int snd_usX2Y_card_used[SNDRV_CARDS];
  
  static void usX2Y_usb_disconnect(struct usb_device* usb_device, void* ptr);
  static void snd_usX2Y_card_private_free(struct snd_card *card);
  
  /* 
   * pipe 4 is used for switching the lamps, setting samplerate, volumes ....   
   */
  static void i_usX2Y_Out04Int(struct urb *urb)
  {
  #ifdef CONFIG_SND_DEBUG
  	if (urb->status) {
  		int 		i;
  		struct usX2Ydev *usX2Y = urb->context;
  		for (i = 0; i < 10 && usX2Y->AS04.urb[i] != urb; i++);
  		snd_printdd("i_usX2Y_Out04Int() urb %i status=%i
  ", i, urb->status);
  	}
  #endif
  }
  
  static void i_usX2Y_In04Int(struct urb *urb)
  {
  	int			err = 0;
  	struct usX2Ydev		*usX2Y = urb->context;
  	struct us428ctls_sharedmem	*us428ctls = usX2Y->us428ctls_sharedmem;
  
  	usX2Y->In04IntCalls++;
  
  	if (urb->status) {
  		snd_printdd("Interrupt Pipe 4 came back with status=%i
  ", urb->status);
  		return;
  	}
  
  	//	printk("%i:0x%02X ", 8, (int)((unsigned char*)usX2Y->In04Buf)[8]); Master volume shows 0 here if fader is at max during boot ?!?
  	if (us428ctls) {
  		int diff = -1;
  		if (-2 == us428ctls->CtlSnapShotLast) {
  			diff = 0;
  			memcpy(usX2Y->In04Last, usX2Y->In04Buf, sizeof(usX2Y->In04Last));
  			us428ctls->CtlSnapShotLast = -1;
  		} else {
  			int i;
  			for (i = 0; i < 21; i++) {
  				if (usX2Y->In04Last[i] != ((char*)usX2Y->In04Buf)[i]) {
  					if (diff < 0)
  						diff = i;
  					usX2Y->In04Last[i] = ((char*)usX2Y->In04Buf)[i];
  				}
  			}
  		}
  		if (0 <= diff) {
  			int n = us428ctls->CtlSnapShotLast + 1;
  			if (n >= N_us428_ctl_BUFS  ||  n < 0)
  				n = 0;
  			memcpy(us428ctls->CtlSnapShot + n, usX2Y->In04Buf, sizeof(us428ctls->CtlSnapShot[0]));
  			us428ctls->CtlSnapShotDiffersAt[n] = diff;
  			us428ctls->CtlSnapShotLast = n;
  			wake_up(&usX2Y->us428ctls_wait_queue_head);
  		}
  	}
  	
  	
  	if (usX2Y->US04) {
  		if (0 == usX2Y->US04->submitted)
  			do {
  				err = usb_submit_urb(usX2Y->US04->urb[usX2Y->US04->submitted++], GFP_ATOMIC);
  			} while (!err && usX2Y->US04->submitted < usX2Y->US04->len);
  	} else
  		if (us428ctls && us428ctls->p4outLast >= 0 && us428ctls->p4outLast < N_us428_p4out_BUFS) {
  			if (us428ctls->p4outLast != us428ctls->p4outSent) {
  				int j, send = us428ctls->p4outSent + 1;
  				if (send >= N_us428_p4out_BUFS)
  					send = 0;
  				for (j = 0; j < URBS_AsyncSeq  &&  !err; ++j)
  					if (0 == usX2Y->AS04.urb[j]->status) {
  						struct us428_p4out *p4out = us428ctls->p4out + send;	// FIXME if more than 1 p4out is new, 1 gets lost.
  						usb_fill_bulk_urb(usX2Y->AS04.urb[j], usX2Y->dev,
  								  usb_sndbulkpipe(usX2Y->dev, 0x04), &p4out->val.vol,
  								  p4out->type == eLT_Light ? sizeof(struct us428_lights) : 5,
  								  i_usX2Y_Out04Int, usX2Y);
  						err = usb_submit_urb(usX2Y->AS04.urb[j], GFP_ATOMIC);
  						us428ctls->p4outSent = send;
  						break;
  					}
  			}
  		}
  
  	if (err)
  		snd_printk(KERN_ERR "In04Int() usb_submit_urb err=%i
  ", err);
  
  	urb->dev = usX2Y->dev;
  	usb_submit_urb(urb, GFP_ATOMIC);
  }
  
  /*
   * Prepare some urbs
   */
  int usX2Y_AsyncSeq04_init(struct usX2Ydev *usX2Y)
  {
  	int	err = 0,
  		i;
  
  	if (NULL == (usX2Y->AS04.buffer = kmalloc(URB_DataLen_AsyncSeq*URBS_AsyncSeq, GFP_KERNEL))) {
  		err = -ENOMEM;
  	} else
  		for (i = 0; i < URBS_AsyncSeq; ++i) {
  			if (NULL == (usX2Y->AS04.urb[i] = usb_alloc_urb(0, GFP_KERNEL))) {
  				err = -ENOMEM;
  				break;
  			}
  			usb_fill_bulk_urb(	usX2Y->AS04.urb[i], usX2Y->dev,
  						usb_sndbulkpipe(usX2Y->dev, 0x04),
  						usX2Y->AS04.buffer + URB_DataLen_AsyncSeq*i, 0,
  						i_usX2Y_Out04Int, usX2Y
  				);
  		}
  	return err;
  }
  
  int usX2Y_In04_init(struct usX2Ydev *usX2Y)
  {
  	if (! (usX2Y->In04urb = usb_alloc_urb(0, GFP_KERNEL)))
  		return -ENOMEM;
  
  	if (! (usX2Y->In04Buf = kmalloc(21, GFP_KERNEL))) {
  		usb_free_urb(usX2Y->In04urb);
  		return -ENOMEM;
  	}
  	 
  	init_waitqueue_head(&usX2Y->In04WaitQueue);
  	usb_fill_int_urb(usX2Y->In04urb, usX2Y->dev, usb_rcvintpipe(usX2Y->dev, 0x4),
  			 usX2Y->In04Buf, 21,
  			 i_usX2Y_In04Int, usX2Y,
  			 10);
  	return usb_submit_urb(usX2Y->In04urb, GFP_KERNEL);
  }
  
  static void usX2Y_unlinkSeq(struct snd_usX2Y_AsyncSeq *S)
  {
  	int	i;
  	for (i = 0; i < URBS_AsyncSeq; ++i) {
  		usb_kill_urb(S->urb[i]);
  		usb_free_urb(S->urb[i]);
  		S->urb[i] = NULL;
  	}
  	kfree(S->buffer);
  }
  
  
  static struct usb_device_id snd_usX2Y_usb_id_table[] = {
  	{
  		.match_flags =	USB_DEVICE_ID_MATCH_DEVICE,
  		.idVendor =	0x1604,
  		.idProduct =	USB_ID_US428 
  	},
  	{
  		.match_flags =	USB_DEVICE_ID_MATCH_DEVICE,
  		.idVendor =	0x1604,
  		.idProduct =	USB_ID_US122 
  	},
   	{
  		.match_flags =	USB_DEVICE_ID_MATCH_DEVICE,
  		.idVendor =	0x1604,
  		.idProduct =	USB_ID_US224
  	},
  	{ /* terminator */ }
  };
  
  static int usX2Y_create_card(struct usb_device *device, struct snd_card **cardp)
  {
  	int		dev;
  	struct snd_card *	card;
  	int err;
  
  	for (dev = 0; dev < SNDRV_CARDS; ++dev)
  		if (enable[dev] && !snd_usX2Y_card_used[dev])
  			break;
  	if (dev >= SNDRV_CARDS)
  		return -ENODEV;
  	err = snd_card_create(index[dev], id[dev], THIS_MODULE,
  			      sizeof(struct usX2Ydev), &card);
  	if (err < 0)
  		return err;
  	snd_usX2Y_card_used[usX2Y(card)->card_index = dev] = 1;
  	card->private_free = snd_usX2Y_card_private_free;
  	usX2Y(card)->dev = device;
  	init_waitqueue_head(&usX2Y(card)->prepare_wait_queue);
  	mutex_init(&usX2Y(card)->prepare_mutex);
  	INIT_LIST_HEAD(&usX2Y(card)->midi_list);
  	strcpy(card->driver, "USB "NAME_ALLCAPS"");
  	sprintf(card->shortname, "TASCAM "NAME_ALLCAPS"");
  	sprintf(card->longname, "%s (%x:%x if %d at %03d/%03d)",
  		card->shortname, 
  		le16_to_cpu(device->descriptor.idVendor),
  		le16_to_cpu(device->descriptor.idProduct),
  		0,//us428(card)->usbmidi.ifnum,
  		usX2Y(card)->dev->bus->busnum, usX2Y(card)->dev->devnum
  		);
  	*cardp = card;
  	return 0;
  }
  
  
  static int usX2Y_usb_probe(struct usb_device *device,
  			   struct usb_interface *intf,
  			   const struct usb_device_id *device_id,
  			   struct snd_card **cardp)
  {
  	int		err;
  	struct snd_card *	card;
  
  	*cardp = NULL;
  	if (le16_to_cpu(device->descriptor.idVendor) != 0x1604 ||
  	    (le16_to_cpu(device->descriptor.idProduct) != USB_ID_US122 &&
  	     le16_to_cpu(device->descriptor.idProduct) != USB_ID_US224 &&
  	     le16_to_cpu(device->descriptor.idProduct) != USB_ID_US428))
  		return -EINVAL;
  
  	err = usX2Y_create_card(device, &card);
  	if (err < 0)
  		return err;
  	snd_card_set_dev(card, &intf->dev);
  	if ((err = usX2Y_hwdep_new(card, device)) < 0  ||
  	    (err = snd_card_register(card)) < 0) {
  		snd_card_free(card);
  		return err;
  	}
  	*cardp = card;
  	return 0;
  }
  
  /*
   * new 2.5 USB kernel API
   */
  static int snd_usX2Y_probe(struct usb_interface *intf, const struct usb_device_id *id)
  {
  	struct snd_card *card;
  	int err;
  
  	err = usX2Y_usb_probe(interface_to_usbdev(intf), intf, id, &card);
  	if (err < 0)
  		return err;
  	dev_set_drvdata(&intf->dev, card);
  	return 0;
  }
  
  static void snd_usX2Y_disconnect(struct usb_interface *intf)
  {
  	usX2Y_usb_disconnect(interface_to_usbdev(intf),
  				 usb_get_intfdata(intf));
  }
  
  MODULE_DEVICE_TABLE(usb, snd_usX2Y_usb_id_table);
  static struct usb_driver snd_usX2Y_usb_driver = {
  	.name =		"snd-usb-usx2y",
  	.probe =	snd_usX2Y_probe,
  	.disconnect =	snd_usX2Y_disconnect,
  	.id_table =	snd_usX2Y_usb_id_table,
  };
  
  static void snd_usX2Y_card_private_free(struct snd_card *card)
  {
  	kfree(usX2Y(card)->In04Buf);
  	usb_free_urb(usX2Y(card)->In04urb);
  	if (usX2Y(card)->us428ctls_sharedmem)
  		snd_free_pages(usX2Y(card)->us428ctls_sharedmem, sizeof(*usX2Y(card)->us428ctls_sharedmem));
  	if (usX2Y(card)->card_index >= 0  &&  usX2Y(card)->card_index < SNDRV_CARDS)
  		snd_usX2Y_card_used[usX2Y(card)->card_index] = 0;
  }
  
  /*
   * Frees the device.
   */
  static void usX2Y_usb_disconnect(struct usb_device *device, void* ptr)
  {
  	if (ptr) {
  		struct snd_card *card = ptr;
  		struct usX2Ydev *usX2Y = usX2Y(card);
  		struct list_head *p;
  		usX2Y->chip_status = USX2Y_STAT_CHIP_HUP;
  		usX2Y_unlinkSeq(&usX2Y->AS04);
  		usb_kill_urb(usX2Y->In04urb);
  		snd_card_disconnect(card);
  		/* release the midi resources */
  		list_for_each(p, &usX2Y->midi_list) {
  			snd_usbmidi_disconnect(p);
  		}
  		if (usX2Y->us428ctls_sharedmem) 
  			wake_up(&usX2Y->us428ctls_wait_queue_head);
  		snd_card_free(card);
  	}
  }
  
  module_usb_driver(snd_usX2Y_usb_driver);