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