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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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719f82d398
Added the support of AudioScience ASI boards. The driver has been tested for years on alsa-driver external tree, now finally got merged to the kernel. Signed-off-by: Eliot Blennerhassett <eblennerhassett@audioscience.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
131 lines
3.9 KiB
C
131 lines
3.9 KiB
C
/******************************************************************************
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AudioScience HPI driver
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Copyright (C) 1997-2010 AudioScience Inc. <support@audioscience.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of version 2 of the GNU General Public License as
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published by the Free Software Foundation;
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Hardware Programming Interface (HPI) Utility functions.
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(C) Copyright AudioScience Inc. 2007
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*******************************************************************************/
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#include "hpi_internal.h"
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#include "hpimsginit.h"
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/* The actual message size for each object type */
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static u16 msg_size[HPI_OBJ_MAXINDEX + 1] = HPI_MESSAGE_SIZE_BY_OBJECT;
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/* The actual response size for each object type */
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static u16 res_size[HPI_OBJ_MAXINDEX + 1] = HPI_RESPONSE_SIZE_BY_OBJECT;
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/* Flag to enable alternate message type for SSX2 bypass. */
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static u16 gwSSX2_bypass;
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/** \internal
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* Used by ASIO driver to disable SSX2 for a single process
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* \param phSubSys Pointer to HPI subsystem handle.
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* \param wBypass New bypass setting 0 = off, nonzero = on
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* \return Previous bypass setting.
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*/
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u16 hpi_subsys_ssx2_bypass(const struct hpi_hsubsys *ph_subsys, u16 bypass)
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{
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u16 old_value = gwSSX2_bypass;
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gwSSX2_bypass = bypass;
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return old_value;
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}
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/** \internal
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* initialize the HPI message structure
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*/
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static void hpi_init_message(struct hpi_message *phm, u16 object,
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u16 function)
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{
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memset(phm, 0, sizeof(*phm));
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if ((object > 0) && (object <= HPI_OBJ_MAXINDEX))
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phm->size = msg_size[object];
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else
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phm->size = sizeof(*phm);
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if (gwSSX2_bypass)
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phm->type = HPI_TYPE_SSX2BYPASS_MESSAGE;
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else
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phm->type = HPI_TYPE_MESSAGE;
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phm->object = object;
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phm->function = function;
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phm->version = 0;
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/* Expect adapter index to be set by caller */
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}
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/** \internal
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* initialize the HPI response structure
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*/
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void hpi_init_response(struct hpi_response *phr, u16 object, u16 function,
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u16 error)
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{
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memset(phr, 0, sizeof(*phr));
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phr->type = HPI_TYPE_RESPONSE;
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if ((object > 0) && (object <= HPI_OBJ_MAXINDEX))
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phr->size = res_size[object];
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else
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phr->size = sizeof(*phr);
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phr->object = object;
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phr->function = function;
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phr->error = error;
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phr->specific_error = 0;
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phr->version = 0;
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}
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void hpi_init_message_response(struct hpi_message *phm,
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struct hpi_response *phr, u16 object, u16 function)
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{
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hpi_init_message(phm, object, function);
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/* default error return if the response is
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not filled in by the callee */
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hpi_init_response(phr, object, function,
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HPI_ERROR_PROCESSING_MESSAGE);
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}
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static void hpi_init_messageV1(struct hpi_message_header *phm, u16 size,
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u16 object, u16 function)
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{
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memset(phm, 0, sizeof(*phm));
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if ((object > 0) && (object <= HPI_OBJ_MAXINDEX)) {
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phm->size = size;
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phm->type = HPI_TYPE_MESSAGE;
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phm->object = object;
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phm->function = function;
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phm->version = 1;
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/* Expect adapter index to be set by caller */
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}
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}
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void hpi_init_responseV1(struct hpi_response_header *phr, u16 size,
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u16 object, u16 function)
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{
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memset(phr, 0, sizeof(*phr));
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phr->size = size;
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phr->version = 1;
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phr->type = HPI_TYPE_RESPONSE;
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phr->error = HPI_ERROR_PROCESSING_MESSAGE;
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}
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void hpi_init_message_responseV1(struct hpi_message_header *phm, u16 msg_size,
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struct hpi_response_header *phr, u16 res_size, u16 object,
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u16 function)
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{
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hpi_init_messageV1(phm, msg_size, object, function);
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hpi_init_responseV1(phr, res_size, object, function);
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}
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