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Code Issues Releases Activity

add suspend/resume for yamaha chips

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Submitted by:	Ira L Cooper <ira@MIT.EDU>
This commit is contained in:
Cameron Grant 2000-07-30 21:15:35 +00:00
parent 0825a8a33f
commit 5151584d21
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=64032
1 changed files with 75 additions and 0 deletions
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75
sys/dev/sound/isa/mss.c
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@ -36,6 +36,8 @@
#define MSS_BUFFSIZE (65536 - 256)
#define abs(x) (((x) < 0) ? -(x) : (x))
#define MSS_INDEXED_REGS 0x20
#define OPL_INDEXED_REGS 0x19
struct mss_info;
@ -60,6 +62,8 @@ struct mss_info {
int drq2_rid;
bus_dma_tag_t parent_dmat;
char mss_indexed_regs[MSS_INDEXED_REGS];
char opl_indexed_regs[OPL_INDEXED_REGS];
int pdma, rdma;
int bd_id; /* used to hold board-id info, eg. sb version,
* mss codec type, etc. etc.
@ -944,10 +948,79 @@ mss_attach(device_t dev)
return mss_doattach(dev, mss);
}
/*
* mss_resume() is the code to allow a laptop to resume using the sound
* card.
*
* This routine re-sets the state of the board to the state before going
* to sleep. According to the yamaha docs this is the right thing to do,
* but getting DMA restarted appears to be a bit of a trick, so the device
* has to be closed and re-opened to be re-used, but there is no skipping
* problem, and volume, bass/treble and most other things are restored
* properly.
*
*/
static int
mss_resume(device_t dev)
{
/*
* Restore the state taken below.
*/
struct mss_info *mss;
int i;
mss = pcm_getdevinfo(dev);
if (mss->bd_id == MD_YM0020)
{
/* This works on a Toshiba Libretto 100CT. */
for (i = 0; i < MSS_INDEXED_REGS; i++)
ad_write(mss, i, mss->mss_indexed_regs[i]);
for (i = 0; i < OPL_INDEXED_REGS; i++)
conf_wr(mss, i, mss->opl_indexed_regs[i]);
mss_intr(mss);
}
return 0;
}
/*
* mss_suspend() is the code that gets called right before a laptop
* suspends.
*
* This code saves the state of the sound card right before shutdown
* so it can be restored above.
*
*/
static int
mss_suspend(device_t dev)
{
int i;
struct mss_info *mss;
mss = pcm_getdevinfo(dev);
if(mss->bd_id == MD_YM0020)
{
/* this stops playback. */
conf_wr(mss, 0x12, 0x0c);
for(i = 0; i < MSS_INDEXED_REGS; i++)
mss->mss_indexed_regs[i] = ad_read(mss, i);
for(i = 0; i < OPL_INDEXED_REGS; i++)
mss->opl_indexed_regs[i] = conf_rd(mss, i);
mss->opl_indexed_regs[0x12] = 0x0;
}
return 0;
}
static device_method_t mss_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, mss_probe),
DEVMETHOD(device_attach, mss_attach),
DEVMETHOD(device_suspend, mss_suspend),
DEVMETHOD(device_resume, mss_resume),
{ 0, 0 }
};
@ -1443,6 +1516,8 @@ static device_method_t pnpmss_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, pnpmss_probe),
DEVMETHOD(device_attach, pnpmss_attach),
DEVMETHOD(device_suspend, mss_suspend),
DEVMETHOD(device_resume, mss_resume),
{ 0, 0 }
};