linux/sound/pci/asihpi/hpidspcd.h
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   1/***********************************************************************/
   2/**
   3
   4    AudioScience HPI driver
   5    Copyright (C) 1997-2010  AudioScience Inc. <support@audioscience.com>
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of version 2 of the GNU General Public License as
   9    published by the Free Software Foundation;
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19
  20\file
  21Functions for reading DSP code to load into DSP
  22
  23 hpi_dspcode_defines HPI DSP code loading method
  24Define exactly one of these to select how the DSP code is supplied to
  25the adapter.
  26
  27End users writing applications that use the HPI interface do not have to
  28use any of the below defines; they are only necessary for building drivers
  29
  30HPI_DSPCODE_FILE:
  31DSP code is supplied as a file that is opened and read from by the driver.
  32
  33HPI_DSPCODE_FIRMWARE:
  34DSP code is read using the hotplug firmware loader module.
  35     Only valid when compiling the HPI kernel driver under Linux.
  36*/
  37/***********************************************************************/
  38#ifndef _HPIDSPCD_H_
  39#define _HPIDSPCD_H_
  40
  41#include "hpi_internal.h"
  42
  43#ifndef DISABLE_PRAGMA_PACK1
  44#pragma pack(push, 1)
  45#endif
  46
  47/** Descriptor for dspcode from firmware loader */
  48struct dsp_code {
  49        /**  Firmware descriptor */
  50        const struct firmware *ps_firmware;
  51        struct pci_dev *ps_dev;
  52        /** Expected number of words in the whole dsp code,INCL header */
  53        long int block_length;
  54        /** Number of words read so far */
  55        long int word_count;
  56        /** Version read from dsp code file */
  57        u32 version;
  58        /** CRC read from dsp code file */
  59        u32 crc;
  60};
  61
  62#ifndef DISABLE_PRAGMA_PACK1
  63#pragma pack(pop)
  64#endif
  65
  66/** Prepare *psDspCode to refer to the requuested adapter.
  67 Searches the file, or selects the appropriate linked array
  68
  69\return 0 for success, or error code if requested code is not available
  70*/
  71short hpi_dsp_code_open(
  72        /** Code identifier, usually adapter family */
  73        u32 adapter,
  74        /** Pointer to DSP code control structure */
  75        struct dsp_code *ps_dsp_code,
  76        /** Pointer to dword to receive OS specific error code */
  77        u32 *pos_error_code);
  78
  79/** Close the DSP code file */
  80void hpi_dsp_code_close(struct dsp_code *ps_dsp_code);
  81
  82/** Rewind to the beginning of the DSP code file (for verify) */
  83void hpi_dsp_code_rewind(struct dsp_code *ps_dsp_code);
  84
  85/** Read one word from the dsp code file
  86        \return 0 for success, or error code if eof, or block length exceeded
  87*/
  88short hpi_dsp_code_read_word(struct dsp_code *ps_dsp_code,
  89                                      /**< DSP code descriptor */
  90        u32 *pword /**< where to store the read word */
  91        );
  92
  93/** Get a block of dsp code into an internal buffer, and provide a pointer to
  94that buffer. (If dsp code is already an array in memory, it is referenced,
  95not copied.)
  96
  97\return Error if requested number of words are not available
  98*/
  99short hpi_dsp_code_read_block(size_t words_requested,
 100        struct dsp_code *ps_dsp_code,
 101        /* Pointer to store (Pointer to code buffer) */
 102        u32 **ppblock);
 103
 104#endif
 105