sound/pci/ctxfi/cthardware.c

   1 /**
   2  * Copyright (C) 2008, Creative Technology Ltd. All Rights Reserved.
   3  *
   4  * This source file is released under GPL v2 license (no other versions).
   5  * See the COPYING file included in the main directory of this source
   6  * distribution for the license terms and conditions.
   7  *
   8  * @File        cthardware.c
   9  *
  10  * @Brief
  11  * This file contains the implementation of hardware access methord.
  12  *
  13  * @Author      Liu Chun
  14  * @Date        Jun 26 2008
  15  *
  16  */
  17
  18 #include "cthardware.h"
  19 #include "cthw20k1.h"
  20 #include "cthw20k2.h"
  21 #include <linux/bug.h>
  22
  23 int create_hw_obj(struct pci_dev *pci, enum CHIPTYP chip_type,
  24                   enum CTCARDS model, struct hw **rhw)
  25 {
  26         int err;
  27
  28         switch (chip_type) {
  29         case ATC20K1:
  30                 err = create_20k1_hw_obj(rhw);
  31                 break;
  32         case ATC20K2:
  33                 err = create_20k2_hw_obj(rhw);
  34                 break;
  35         default:
  36                 err = -ENODEV;
  37                 break;
  38         }
  39         if (err)
  40                 return err;
  41
  42         (*rhw)->pci = pci;
  43         (*rhw)->chip_type = chip_type;
  44         (*rhw)->model = model;
  45
  46         return 0;
  47 }
  48
  49 int destroy_hw_obj(struct hw *hw)
  50 {
  51         int err;
  52
  53         switch (hw->pci->device) {
  54         case 0x0005:    /* 20k1 device */
  55                 err = destroy_20k1_hw_obj(hw);
  56                 break;
  57         case 0x000B:    /* 20k2 device */
  58                 err = destroy_20k2_hw_obj(hw);
  59                 break;
  60         default:
  61                 err = -ENODEV;
  62                 break;
  63         }
  64
  65         return err;
  66 }
  67
  68 unsigned int get_field(unsigned int data, unsigned int field)
  69 {
  70         int i;
  71
  72         if (WARN_ON(!field))
  73                 return 0;
  74         /* @field should always be greater than 0 */
  75         for (i = 0; !(field & (1 << i)); )
  76                 i++;
  77
  78         return (data & field) >> i;
  79 }
  80
  81 void set_field(unsigned int *data, unsigned int field, unsigned int value)
  82 {
  83         int i;
  84
  85         if (WARN_ON(!field))
  86                 return;
  87         /* @field should always be greater than 0 */
  88         for (i = 0; !(field & (1 << i)); )
  89                 i++;
  90
  91         *data = (*data & (~field)) | ((value << i) & field);
  92 }
  93