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chip.c

/*
 * Linux driver for TerraTec DMX 6Fire USB
 *
 * Main routines and module definitions.
 *
 * Author:  Torsten Schenk <torsten.schenk@zoho.com>
 * Created: Jan 01, 2011
 * Version: 0.3.0
 * Copyright:     (C) Torsten Schenk
 *
 * 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.
 */

#include "chip.h"
#include "firmware.h"
#include "pcm.h"
#include "control.h"
#include "comm.h"
#include "midi.h"

#include <linux/moduleparam.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/gfp.h>
#include <sound/initval.h>

MODULE_AUTHOR("Torsten Schenk <torsten.schenk@zoho.com>");
MODULE_DESCRIPTION("TerraTec DMX 6Fire USB audio driver, version 0.3.0");
MODULE_LICENSE("GPL v2");
MODULE_SUPPORTED_DEVICE("{{TerraTec, DMX 6Fire USB}}");

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-max */
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* Id for card */
static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP; /* Enable card */
static struct sfire_chip *chips[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;
static struct usb_device *devices[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for the 6fire sound device");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for the 6fire sound device.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable the 6fire sound device.");

static DEFINE_MUTEX(register_mutex);

static void usb6fire_chip_abort(struct sfire_chip *chip)
{
      if (chip) {
            if (chip->pcm)
                  usb6fire_pcm_abort(chip);
            if (chip->midi)
                  usb6fire_midi_abort(chip);
            if (chip->comm)
                  usb6fire_comm_abort(chip);
            if (chip->control)
                  usb6fire_control_abort(chip);
            if (chip->card) {
                  snd_card_disconnect(chip->card);
                  snd_card_free_when_closed(chip->card);
                  chip->card = NULL;
            }
      }
}

static void usb6fire_chip_destroy(struct sfire_chip *chip)
{
      if (chip) {
            if (chip->pcm)
                  usb6fire_pcm_destroy(chip);
            if (chip->midi)
                  usb6fire_midi_destroy(chip);
            if (chip->comm)
                  usb6fire_comm_destroy(chip);
            if (chip->control)
                  usb6fire_control_destroy(chip);
            if (chip->card)
                  snd_card_free(chip->card);
      }
}

static int __devinit usb6fire_chip_probe(struct usb_interface *intf,
            const struct usb_device_id *usb_id)
{
      int ret;
      int i;
      struct sfire_chip *chip = NULL;
      struct usb_device *device = interface_to_usbdev(intf);
      int regidx = -1; /* index in module parameter array */
      struct snd_card *card = NULL;

      /* look if we already serve this card and return if so */
      mutex_lock(&register_mutex);
      for (i = 0; i < SNDRV_CARDS; i++) {
            if (devices[i] == device) {
                  if (chips[i])
                        chips[i]->intf_count++;
                  usb_set_intfdata(intf, chips[i]);
                  mutex_unlock(&register_mutex);
                  return 0;
            } else if (regidx < 0)
                  regidx = i;
      }
      if (regidx < 0) {
            mutex_unlock(&register_mutex);
            snd_printk(KERN_ERR PREFIX "too many cards registered.\n");
            return -ENODEV;
      }
      devices[regidx] = device;
      mutex_unlock(&register_mutex);

      /* check, if firmware is present on device, upload it if not */
      ret = usb6fire_fw_init(intf);
      if (ret < 0)
            return ret;
      else if (ret == FW_NOT_READY) /* firmware update performed */
            return 0;

      /* if we are here, card can be registered in alsa. */
      if (usb_set_interface(device, 0, 0) != 0) {
            snd_printk(KERN_ERR PREFIX "can't set first interface.\n");
            return -EIO;
      }
      ret = snd_card_create(index[regidx], id[regidx], THIS_MODULE,
                  sizeof(struct sfire_chip), &card);
      if (ret < 0) {
            snd_printk(KERN_ERR PREFIX "cannot create alsa card.\n");
            return ret;
      }
      strcpy(card->driver, "6FireUSB");
      strcpy(card->shortname, "TerraTec DMX6FireUSB");
      sprintf(card->longname, "%s at %d:%d", card->shortname,
                  device->bus->busnum, device->devnum);
      snd_card_set_dev(card, &intf->dev);

      chip = card->private_data;
      chips[regidx] = chip;
      chip->dev = device;
      chip->regidx = regidx;
      chip->intf_count = 1;
      chip->card = card;

      ret = usb6fire_comm_init(chip);
      if (ret < 0) {
            usb6fire_chip_destroy(chip);
            return ret;
      }

      ret = usb6fire_midi_init(chip);
      if (ret < 0) {
            usb6fire_chip_destroy(chip);
            return ret;
      }

      ret = usb6fire_pcm_init(chip);
      if (ret < 0) {
            usb6fire_chip_destroy(chip);
            return ret;
      }

      ret = usb6fire_control_init(chip);
      if (ret < 0) {
            usb6fire_chip_destroy(chip);
            return ret;
      }

      ret = snd_card_register(card);
      if (ret < 0) {
            snd_printk(KERN_ERR PREFIX "cannot register card.");
            usb6fire_chip_destroy(chip);
            return ret;
      }
      usb_set_intfdata(intf, chip);
      return 0;
}

static void usb6fire_chip_disconnect(struct usb_interface *intf)
{
      struct sfire_chip *chip;
      struct snd_card *card;

      chip = usb_get_intfdata(intf);
      if (chip) { /* if !chip, fw upload has been performed */
            card = chip->card;
            chip->intf_count--;
            if (!chip->intf_count) {
                  mutex_lock(&register_mutex);
                  devices[chip->regidx] = NULL;
                  chips[chip->regidx] = NULL;
                  mutex_unlock(&register_mutex);

                  chip->shutdown = true;
                  usb6fire_chip_abort(chip);
                  usb6fire_chip_destroy(chip);
            }
      }
}

static struct usb_device_id device_table[] = {
      {
            .match_flags = USB_DEVICE_ID_MATCH_DEVICE,
            .idVendor = 0x0ccd,
            .idProduct = 0x0080
      },
      {}
};

MODULE_DEVICE_TABLE(usb, device_table);

static struct usb_driver driver = {
      .name = "snd-usb-6fire",
      .probe = usb6fire_chip_probe,
      .disconnect = usb6fire_chip_disconnect,
      .id_table = device_table,
};

static int __init usb6fire_chip_init(void)
{
      return usb_register(&driver);
}

static void __exit usb6fire_chip_cleanup(void)
{
      usb_deregister(&driver);
}

module_init(usb6fire_chip_init);
module_exit(usb6fire_chip_cleanup);

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