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/*
**********************************************************************
* passthrough.c -- Emu10k1 digital passthrough
* Copyright (C) 2001 Juha Yrj�l� <jyrjola@cc.hut.fi>
*
**********************************************************************
*
* Date Author Summary of changes
* ---- ------ ------------------
* May 15, 2001 Juha Yrj�l� base code release
*
**********************************************************************
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
* USA.
*
**********************************************************************
*/
#include <linux/module.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/bitops.h>
#include <asm/io.h>
#include <linux/sched.h>
#include <linux/smp_lock.h>
#include "hwaccess.h"
#include "cardwo.h"
#include "cardwi.h"
#include "recmgr.h"
#include "irqmgr.h"
#include "audio.h"
#include "8010.h"
static void pt_putsamples(struct pt_data *pt, u16 *ptr, u16 left, u16 right)
{
unsigned int idx;
ptr[pt->copyptr] = left;
idx = pt->copyptr + PT_SAMPLES/2;
idx %= PT_SAMPLES;
ptr[idx] = right;
}
static inline int pt_can_write(struct pt_data *pt)
{
return pt->blocks_copied < pt->blocks_played + 8;
}
static int pt_wait_for_write(struct emu10k1_wavedevice *wavedev, int nonblock)
{
struct emu10k1_card *card = wavedev->card;
struct pt_data *pt = &card->pt;
if (nonblock && !pt_can_write(pt))
return -EAGAIN;
while (!pt_can_write(pt) && pt->state != PT_STATE_INACTIVE) {
interruptible_sleep_on(&pt->wait);
if (signal_pending(current))
return -ERESTARTSYS;
}
if (pt->state == PT_STATE_INACTIVE)
return -EAGAIN;
return 0;
}
static int pt_putblock(struct emu10k1_wavedevice *wave_dev, u16 *block, int nonblock)
{
struct woinst *woinst = wave_dev->woinst;
struct emu10k1_card *card = wave_dev->card;
struct pt_data *pt = &card->pt;
u16 *ptr = (u16 *) card->tankmem.addr;
int i = 0, r;
unsigned long flags;
r = pt_wait_for_write(wave_dev, nonblock);
if (r < 0)
return r;
spin_lock_irqsave(&card->pt.lock, flags);
while (i < PT_BLOCKSAMPLES) {
pt_putsamples(pt, ptr, block[2*i], block[2*i+1]);
if (pt->copyptr == 0)
pt->copyptr = PT_SAMPLES;
pt->copyptr--;
i++;
}
woinst->total_copied += PT_BLOCKSIZE;
pt->blocks_copied++;
if (pt->blocks_copied >= 4 && pt->state != PT_STATE_PLAYING) {
DPF(2, "activating digital pass-through playback\n");
sblive_writeptr(card, GPR_BASE + pt->enable_gpr, 0, 1);
pt->state = PT_STATE_PLAYING;
}
spin_unlock_irqrestore(&card->pt.lock, flags);
return 0;
}
int emu10k1_pt_setup(struct emu10k1_wavedevice *wave_dev)
{
u32 bits;
struct emu10k1_card *card = wave_dev->card;
struct pt_data *pt = &card->pt;
int i;
for (i = 0; i < 3; i++) {
pt->old_spcs[i] = sblive_readptr(card, SPCS0 + i, 0);
if (pt->spcs_to_use & (1 << i)) {
DPD(2, "using S/PDIF port %d\n", i);
bits = SPCS_CLKACCY_1000PPM | SPCS_SAMPLERATE_48 |
SPCS_CHANNELNUM_LEFT | SPCS_SOURCENUM_UNSPEC | SPCS_GENERATIONSTATUS |
0x00001200 | SPCS_EMPHASIS_NONE | SPCS_COPYRIGHT;
if (pt->ac3data)
bits |= SPCS_NOTAUDIODATA;
sblive_writeptr(card, SPCS0 + i, 0, bits);
}
}
return 0;
}
ssize_t emu10k1_pt_write(struct file *file, const char __user *buffer, size_t count)
{
struct emu10k1_wavedevice *wave_dev = (struct emu10k1_wavedevice *) file->private_data;
struct emu10k1_card *card = wave_dev->card;
struct pt_data *pt = &card->pt;
int nonblock, i, r, blocks, blocks_copied, bytes_copied = 0;
DPD(3, "emu10k1_pt_write(): %d bytes\n", count);
nonblock = file->f_flags & O_NONBLOCK;
if (card->tankmem.size < PT_SAMPLES*2)
return -EFAULT;
if (pt->state == PT_STATE_INACTIVE) {
DPF(2, "bufptr init\n");
pt->playptr = PT_SAMPLES-1;
pt->copyptr = PT_INITPTR;
pt->blocks_played = pt->blocks_copied = 0;
memset(card->tankmem.addr, 0, card->tankmem.size);
pt->state = PT_STATE_ACTIVATED;
pt->buf = kmalloc(PT_BLOCKSIZE, GFP_KERNEL);
pt->prepend_size = 0;
if (pt->buf == NULL)
return -ENOMEM;
emu10k1_pt_setup(wave_dev);
}
if (pt->prepend_size) {
int needed = PT_BLOCKSIZE - pt->prepend_size;
DPD(3, "prepend size %d, prepending %d bytes\n", pt->prepend_size, needed);
if (count < needed) {
copy_from_user(pt->buf + pt->prepend_size, buffer, count);
pt->prepend_size += count;
DPD(3, "prepend size now %d\n", pt->prepend_size);
return count;
}
copy_from_user(pt->buf + pt->prepend_size, buffer, needed);
r = pt_putblock(wave_dev, (u16 *) pt->buf, nonblock);
if (r)
return r;
bytes_copied += needed;
pt->prepend_size = 0;
}
blocks = (count-bytes_copied)/PT_BLOCKSIZE;
blocks_copied = 0;
while (blocks > 0) {
u16 __user *bufptr = (u16 __user *) buffer + (bytes_copied/2);
copy_from_user(pt->buf, bufptr, PT_BLOCKSIZE);
r = pt_putblock(wave_dev, (u16 *)pt->buf, nonblock);
if (r) {
if (bytes_copied)
return bytes_copied;
else
return r;
}
bytes_copied += PT_BLOCKSIZE;
blocks--;
blocks_copied++;
}
i = count - bytes_copied;
if (i) {
pt->prepend_size = i;
copy_from_user(pt->buf, buffer + bytes_copied, i);
bytes_copied += i;
DPD(3, "filling prepend buffer with %d bytes", i);
}
return bytes_copied;
}
void emu10k1_pt_stop(struct emu10k1_card *card)
{
struct pt_data *pt = &card->pt;
int i;
if (pt->state != PT_STATE_INACTIVE) {
DPF(2, "digital pass-through stopped\n");
sblive_writeptr(card, (card->is_audigy ? A_GPR_BASE : GPR_BASE) + pt->enable_gpr, 0, 0);
for (i = 0; i < 3; i++) {
if (pt->spcs_to_use & (1 << i))
sblive_writeptr(card, SPCS0 + i, 0, pt->old_spcs[i]);
}
pt->state = PT_STATE_INACTIVE;
kfree(pt->buf);
}
}
void emu10k1_pt_waveout_update(struct emu10k1_wavedevice *wave_dev)
{
struct woinst *woinst = wave_dev->woinst;
struct pt_data *pt = &wave_dev->card->pt;
u32 pos;
if (pt->state == PT_STATE_PLAYING && pt->pos_gpr >= 0) {
pos = sblive_readptr(wave_dev->card, GPR_BASE + pt->pos_gpr, 0);
if (pos > PT_BLOCKSAMPLES)
pos = PT_BLOCKSAMPLES;
pos = 4 * (PT_BLOCKSAMPLES - pos);
} else
pos = 0;
woinst->total_played = pt->blocks_played * woinst->buffer.fragment_size + pos;
woinst->buffer.hw_pos = pos;
}
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