patch-2.4.8 linux/drivers/sound/emu10k1/passthrough.c

• Lines: 244
• Date: Fri Aug 10 21:02:19 2001
• Orig file: v2.4.7/linux/drivers/sound/emu10k1/passthrough.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.7/linux/drivers/sound/emu10k1/passthrough.c linux/drivers/sound/emu10k1/passthrough.c
@@ -0,0 +1,243 @@
+/*
+ **********************************************************************
+ *     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.
+ *
+ **********************************************************************
+ */
+                       
+#define __NO_VERSION__
+#include <linux/module.h>
+#include <linux/poll.h>
+#include <linux/malloc.h>
+#include <linux/version.h>
+#include <linux/bitops.h>
+#include <asm/io.h>
+#include <linux/sched.h>
+#include <linux/smp_lock.h>
+#include <linux/wrapper.h>
+
+#include "hwaccess.h"
+#include "cardwo.h"
+#include "cardwi.h"
+#include "recmgr.h"
+#include "irqmgr.h"
+#include "audio.h"
+#include "8010.h"
+#include "passthrough.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;
+}
+
+static int 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 *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;
+		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 *bufptr = (u16 *) buffer + (bytes_copied/2);
+		copy_from_user(pt->buf, bufptr, PT_BLOCKSIZE);
+		bufptr = (u16 *) pt->buf;
+		r = pt_putblock(wave_dev, bufptr, 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;
+	unsigned long flags;
+
+	spin_lock_irqsave(&card->pt.lock, flags);
+	if (pt->state != PT_STATE_INACTIVE) {
+		DPF(2, "digital pass-through stopped\n");
+		sblive_writeptr(card, 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);
+	}
+	spin_unlock_irqrestore(&card->pt.lock, flags);
+}
+
+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;
+}