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 000000000000..4094be55f3be
--- /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;
+}