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cthardware.c

/**
 * Copyright (C) 2008, Creative Technology Ltd. All Rights Reserved.
 *
 * This source file is released under GPL v2 license (no other versions).
 * See the COPYING file included in the main directory of this source
 * distribution for the license terms and conditions.
 *
 * @File    cthardware.c
 *
 * @Brief
 * This file contains the implementation of hardware access methord.
 *
 * @Author  Liu Chun
 * @Date    Jun 26 2008
 *
 */

#include "cthardware.h"
#include "cthw20k1.h"
#include "cthw20k2.h"
#include <linux/bug.h>

int __devinit create_hw_obj(struct pci_dev *pci, enum CHIPTYP chip_type,
                      enum CTCARDS model, struct hw **rhw)
{
      int err;

      switch (chip_type) {
      case ATC20K1:
            err = create_20k1_hw_obj(rhw);
            break;
      case ATC20K2:
            err = create_20k2_hw_obj(rhw);
            break;
      default:
            err = -ENODEV;
            break;
      }
      if (err)
            return err;

      (*rhw)->pci = pci;
      (*rhw)->chip_type = chip_type;
      (*rhw)->model = model;

      return 0;
}

int destroy_hw_obj(struct hw *hw)
{
      int err;

      switch (hw->pci->device) {
      case 0x0005:      /* 20k1 device */
            err = destroy_20k1_hw_obj(hw);
            break;
      case 0x000B:      /* 20k2 device */
            err = destroy_20k2_hw_obj(hw);
            break;
      default:
            err = -ENODEV;
            break;
      }

      return err;
}

unsigned int get_field(unsigned int data, unsigned int field)
{
      int i;

      BUG_ON(!field);
      /* @field should always be greater than 0 */
      for (i = 0; !(field & (1 << i)); )
            i++;

      return (data & field) >> i;
}

void set_field(unsigned int *data, unsigned int field, unsigned int value)
{
      int i;

      BUG_ON(!field);
      /* @field should always be greater than 0 */
      for (i = 0; !(field & (1 << i)); )
            i++;

      *data = (*data & (~field)) | ((value << i) & field);
}


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