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-rw-r--r--sound/oss/emu10k1/passthrough.c236
1 files changed, 236 insertions, 0 deletions
diff --git a/sound/oss/emu10k1/passthrough.c b/sound/oss/emu10k1/passthrough.c
new file mode 100644
index 00000000000..4094be55f3b
--- /dev/null
+++ b/sound/oss/emu10k1/passthrough.c
@@ -0,0 +1,236 @@
+/*
+ **********************************************************************
+ * passthrough.c -- Emu10k1 digital passthrough
+ * Copyright (C) 2001 Juha Yrjölä <jyrjola@cc.hut.fi>
+ *
+ **********************************************************************
+ *
+ * Date Author Summary of changes
+ * ---- ------ ------------------
+ * May 15, 2001 Juha Yrjölä 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;
+ if(pt->buf)
+ 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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