Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

5 files changed, 5713 insertions, 0 deletions

diff --git a/sound/pci/trident/Makefile b/sound/pci/trident/Makefile
new file mode 100644
index 00000000000..65bc5b70323
--- /dev/null
+++ b/sound/pci/trident/Makefile
@@ -0,0 +1,19 @@
+#
+# Makefile for ALSA
+# Copyright (c) 2001 by Jaroslav Kysela <perex@suse.cz>
+#
+
+snd-trident-objs := trident.o trident_main.o trident_memory.o
+snd-trident-synth-objs := trident_synth.o
+
+#
+# this function returns:
+#   "m" - CONFIG_SND_SEQUENCER is m
+#   <empty string> - CONFIG_SND_SEQUENCER is undefined
+#   otherwise parameter #1 value
+#
+sequencer = $(if $(subst y,,$(CONFIG_SND_SEQUENCER)),$(if $(1),m),$(if $(CONFIG_SND_SEQUENCER),$(1)))
+
+# Toplevel Module Dependency
+obj-$(CONFIG_SND_TRIDENT) += snd-trident.o
+obj-$(call sequencer,$(CONFIG_SND_TRIDENT)) += snd-trident-synth.o
diff --git a/sound/pci/trident/trident.c b/sound/pci/trident/trident.c
new file mode 100644
index 00000000000..ad58e08d66e
--- /dev/null
+++ b/sound/pci/trident/trident.c
@@ -0,0 +1,196 @@
+/*
+ *  Driver for Trident 4DWave DX/NX & SiS SI7018 Audio PCI soundcard
+ *
+ *  Driver was originated by Trident <audio@tridentmicro.com>
+ *  			     Fri Feb 19 15:55:28 MST 1999
+ *
+ *
+ *   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ */
+
+#include <sound/driver.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/time.h>
+#include <linux/moduleparam.h>
+#include <sound/core.h>
+#include <sound/trident.h>
+#include <sound/initval.h>
+
+MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, <audio@tridentmicro.com>");
+MODULE_DESCRIPTION("Trident 4D-WaveDX/NX & SiS SI7018");
+MODULE_LICENSE("GPL");
+MODULE_SUPPORTED_DEVICE("{{Trident,4DWave DX},"
+		"{Trident,4DWave NX},"
+		"{SiS,SI7018 PCI Audio},"
+		"{Best Union,Miss Melody 4DWave PCI},"
+		"{HIS,4DWave PCI},"
+		"{Warpspeed,ONSpeed 4DWave PCI},"
+		"{Aztech Systems,PCI 64-Q3D},"
+		"{Addonics,SV 750},"
+		"{CHIC,True Sound 4Dwave},"
+		"{Shark,Predator4D-PCI},"
+		"{Jaton,SonicWave 4D},"
+		"{Hoontech,SoundTrack Digital 4DWave NX}}");
+
+static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;	/* Index 0-MAX */
+static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;	/* ID for this card */
+static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;	/* Enable this card */
+static int pcm_channels[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 32};
+static int wavetable_size[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8192};
+
+module_param_array(index, int, NULL, 0444);
+MODULE_PARM_DESC(index, "Index value for Trident 4DWave PCI soundcard.");
+module_param_array(id, charp, NULL, 0444);
+MODULE_PARM_DESC(id, "ID string for Trident 4DWave PCI soundcard.");
+module_param_array(enable, bool, NULL, 0444);
+MODULE_PARM_DESC(enable, "Enable Trident 4DWave PCI soundcard.");
+module_param_array(pcm_channels, int, NULL, 0444);
+MODULE_PARM_DESC(pcm_channels, "Number of hardware channels assigned for PCM.");
+module_param_array(wavetable_size, int, NULL, 0444);
+MODULE_PARM_DESC(wavetable_size, "Maximum memory size in kB for wavetable synth.");
+
+static struct pci_device_id snd_trident_ids[] = {
+	{ 0x1023, 0x2000, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, },	/* Trident 4DWave DX PCI Audio */
+	{ 0x1023, 0x2001, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, },	/* Trident 4DWave NX PCI Audio */
+	{ 0x1039, 0x7018, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, },	/* SiS SI7018 PCI Audio */
+	{ 0, }
+};
+
+MODULE_DEVICE_TABLE(pci, snd_trident_ids);
+
+static int __devinit snd_trident_probe(struct pci_dev *pci,
+				       const struct pci_device_id *pci_id)
+{
+	static int dev;
+	snd_card_t *card;
+	trident_t *trident;
+	const char *str;
+	int err, pcm_dev = 0;
+
+	if (dev >= SNDRV_CARDS)
+		return -ENODEV;
+	if (!enable[dev]) {
+		dev++;
+		return -ENOENT;
+	}
+
+	card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0);
+	if (card == NULL)
+		return -ENOMEM;
+
+	if ((err = snd_trident_create(card, pci,
+				      pcm_channels[dev],
+				      ((pci->vendor << 16) | pci->device) == TRIDENT_DEVICE_ID_SI7018 ? 1 : 2,
+				      wavetable_size[dev],
+				      &trident)) < 0) {
+		snd_card_free(card);
+		return err;
+	}
+
+	switch (trident->device) {
+	case TRIDENT_DEVICE_ID_DX:
+		str = "TRID4DWAVEDX";
+		break;
+	case TRIDENT_DEVICE_ID_NX:
+		str = "TRID4DWAVENX";
+		break;
+	case TRIDENT_DEVICE_ID_SI7018:
+		str = "SI7018";
+		break;
+	default:
+		str = "Unknown";
+	}
+	strcpy(card->driver, str);
+	if (trident->device == TRIDENT_DEVICE_ID_SI7018) {
+		strcpy(card->shortname, "SiS ");
+	} else {
+		strcpy(card->shortname, "Trident ");
+	}
+	strcat(card->shortname, card->driver);
+	sprintf(card->longname, "%s PCI Audio at 0x%lx, irq %d",
+		card->shortname, trident->port, trident->irq);
+
+	if ((err = snd_trident_pcm(trident, pcm_dev++, NULL)) < 0) {
+		snd_card_free(card);
+		return err;
+	}
+	switch (trident->device) {
+	case TRIDENT_DEVICE_ID_DX:
+	case TRIDENT_DEVICE_ID_NX:
+		if ((err = snd_trident_foldback_pcm(trident, pcm_dev++, NULL)) < 0) {
+			snd_card_free(card);
+			return err;
+		}
+		break;
+	}
+	if (trident->device == TRIDENT_DEVICE_ID_NX || trident->device == TRIDENT_DEVICE_ID_SI7018) {
+		if ((err = snd_trident_spdif_pcm(trident, pcm_dev++, NULL)) < 0) {
+			snd_card_free(card);
+			return err;
+		}
+	}
+	if ((err = snd_mpu401_uart_new(card, 0, MPU401_HW_TRID4DWAVE,
+				       trident->midi_port, 1,
+				       trident->irq, 0, &trident->rmidi)) < 0) {
+		snd_card_free(card);
+		return err;
+	}
+
+#if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
+	if ((err = snd_trident_attach_synthesizer(trident)) < 0) {
+		snd_card_free(card);
+		return err;
+	}
+#endif
+
+	snd_trident_create_gameport(trident);
+
+	if ((err = snd_card_register(card)) < 0) {
+		snd_card_free(card);
+		return err;
+	}
+	pci_set_drvdata(pci, card);
+	dev++;
+	return 0;
+}
+
+static void __devexit snd_trident_remove(struct pci_dev *pci)
+{
+	snd_card_free(pci_get_drvdata(pci));
+	pci_set_drvdata(pci, NULL);
+}
+
+static struct pci_driver driver = {
+	.name = "Trident4DWaveAudio",
+	.id_table = snd_trident_ids,
+	.probe = snd_trident_probe,
+	.remove = __devexit_p(snd_trident_remove),
+	SND_PCI_PM_CALLBACKS
+};
+
+static int __init alsa_card_trident_init(void)
+{
+	return pci_module_init(&driver);
+}
+
+static void __exit alsa_card_trident_exit(void)
+{
+	pci_unregister_driver(&driver);
+}
+
+module_init(alsa_card_trident_init)
+module_exit(alsa_card_trident_exit)
diff --git a/sound/pci/trident/trident_main.c b/sound/pci/trident/trident_main.c
new file mode 100644
index 00000000000..ccd5ca2ba16
--- /dev/null
+++ b/sound/pci/trident/trident_main.c
@@ -0,0 +1,3991 @@
+/*
+ *  Maintained by Jaroslav Kysela <perex@suse.cz>
+ *  Originated by audio@tridentmicro.com
+ *  Fri Feb 19 15:55:28 MST 1999
+ *  Routines for control of Trident 4DWave (DX and NX) chip
+ *
+ *  BUGS:
+ *
+ *  TODO:
+ *    ---
+ *
+ *   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ *
+ *  SiS7018 S/PDIF support by Thomas Winischhofer <thomas@winischhofer.net>
+ */
+
+#include <sound/driver.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/gameport.h>
+
+#include <sound/core.h>
+#include <sound/info.h>
+#include <sound/control.h>
+#include <sound/trident.h>
+#include <sound/asoundef.h>
+
+#include <asm/io.h>
+
+static int snd_trident_pcm_mixer_build(trident_t *trident, snd_trident_voice_t * voice, snd_pcm_substream_t *substream);
+static int snd_trident_pcm_mixer_free(trident_t *trident, snd_trident_voice_t * voice, snd_pcm_substream_t *substream);
+static irqreturn_t snd_trident_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+#ifdef CONFIG_PM
+static int snd_trident_suspend(snd_card_t *card, pm_message_t state);
+static int snd_trident_resume(snd_card_t *card);
+#endif
+static int snd_trident_sis_reset(trident_t *trident);
+
+static void snd_trident_clear_voices(trident_t * trident, unsigned short v_min, unsigned short v_max);
+static int snd_trident_free(trident_t *trident);
+
+/*
+ *  common I/O routines
+ */
+
+
+#if 0
+static void snd_trident_print_voice_regs(trident_t *trident, int voice)
+{
+	unsigned int val, tmp;
+
+	printk("Trident voice %i:\n", voice);
+	outb(voice, TRID_REG(trident, T4D_LFO_GC_CIR));
+	val = inl(TRID_REG(trident, CH_LBA));
+	printk("LBA: 0x%x\n", val);
+	val = inl(TRID_REG(trident, CH_GVSEL_PAN_VOL_CTRL_EC));
+	printk("GVSel: %i\n", val >> 31);
+	printk("Pan: 0x%x\n", (val >> 24) & 0x7f);
+	printk("Vol: 0x%x\n", (val >> 16) & 0xff);
+	printk("CTRL: 0x%x\n", (val >> 12) & 0x0f);
+	printk("EC: 0x%x\n", val & 0x0fff);
+	if (trident->device != TRIDENT_DEVICE_ID_NX) {
+		val = inl(TRID_REG(trident, CH_DX_CSO_ALPHA_FMS));
+		printk("CSO: 0x%x\n", val >> 16);
+		printk("Alpha: 0x%x\n", (val >> 4) & 0x0fff);
+		printk("FMS: 0x%x\n", val & 0x0f);
+		val = inl(TRID_REG(trident, CH_DX_ESO_DELTA));
+		printk("ESO: 0x%x\n", val >> 16);
+		printk("Delta: 0x%x\n", val & 0xffff);
+		val = inl(TRID_REG(trident, CH_DX_FMC_RVOL_CVOL));
+	} else {		// TRIDENT_DEVICE_ID_NX
+		val = inl(TRID_REG(trident, CH_NX_DELTA_CSO));
+		tmp = (val >> 24) & 0xff;
+		printk("CSO: 0x%x\n", val & 0x00ffffff);
+		val = inl(TRID_REG(trident, CH_NX_DELTA_ESO));
+		tmp |= (val >> 16) & 0xff00;
+		printk("Delta: 0x%x\n", tmp);
+		printk("ESO: 0x%x\n", val & 0x00ffffff);
+		val = inl(TRID_REG(trident, CH_NX_ALPHA_FMS_FMC_RVOL_CVOL));
+		printk("Alpha: 0x%x\n", val >> 20);
+		printk("FMS: 0x%x\n", (val >> 16) & 0x0f);
+	}
+	printk("FMC: 0x%x\n", (val >> 14) & 3);
+	printk("RVol: 0x%x\n", (val >> 7) & 0x7f);
+	printk("CVol: 0x%x\n", val & 0x7f);
+}
+#endif
+
+/*---------------------------------------------------------------------------
+   unsigned short snd_trident_codec_read(ac97_t *ac97, unsigned short reg)
+  
+   Description: This routine will do all of the reading from the external
+                CODEC (AC97).
+  
+   Parameters:  ac97 - ac97 codec structure
+                reg - CODEC register index, from AC97 Hal.
+ 
+   returns:     16 bit value read from the AC97.
+  
+  ---------------------------------------------------------------------------*/
+static unsigned short snd_trident_codec_read(ac97_t *ac97, unsigned short reg)
+{
+	unsigned int data = 0, treg;
+	unsigned short count = 0xffff;
+	unsigned long flags;
+	trident_t *trident = ac97->private_data;
+
+	spin_lock_irqsave(&trident->reg_lock, flags);
+	if (trident->device == TRIDENT_DEVICE_ID_DX) {
+		data = (DX_AC97_BUSY_READ | (reg & 0x000000ff));
+		outl(data, TRID_REG(trident, DX_ACR1_AC97_R));
+		do {
+			data = inl(TRID_REG(trident, DX_ACR1_AC97_R));
+			if ((data & DX_AC97_BUSY_READ) == 0)
+				break;
+		} while (--count);
+	} else if (trident->device == TRIDENT_DEVICE_ID_NX) {
+		data = (NX_AC97_BUSY_READ | (reg & 0x000000ff));
+		treg = ac97->num == 0 ? NX_ACR2_AC97_R_PRIMARY : NX_ACR3_AC97_R_SECONDARY;
+		outl(data, TRID_REG(trident, treg));
+		do {
+			data = inl(TRID_REG(trident, treg));
+			if ((data & 0x00000C00) == 0)
+				break;
+		} while (--count);
+	} else if (trident->device == TRIDENT_DEVICE_ID_SI7018) {
+		data = SI_AC97_BUSY_READ | SI_AC97_AUDIO_BUSY | (reg & 0x000000ff);
+		if (ac97->num == 1)
+			data |= SI_AC97_SECONDARY;
+		outl(data, TRID_REG(trident, SI_AC97_READ));
+		do {
+			data = inl(TRID_REG(trident, SI_AC97_READ));
+			if ((data & (SI_AC97_BUSY_READ)) == 0)
+				break;
+		} while (--count);
+	}
+
+	if (count == 0 && !trident->ac97_detect) {
+		snd_printk("ac97 codec read TIMEOUT [0x%x/0x%x]!!!\n", reg, data);
+		data = 0;
+	}
+
+	spin_unlock_irqrestore(&trident->reg_lock, flags);
+	return ((unsigned short) (data >> 16));
+}
+
+/*---------------------------------------------------------------------------
+   void snd_trident_codec_write(ac97_t *ac97, unsigned short reg, unsigned short wdata)
+  
+   Description: This routine will do all of the writing to the external
+                CODEC (AC97).
+  
+   Parameters:	ac97 - ac97 codec structure
+   	        reg - CODEC register index, from AC97 Hal.
+                data  - Lower 16 bits are the data to write to CODEC.
+  
+   returns:     TRUE if everything went ok, else FALSE.
+  
+  ---------------------------------------------------------------------------*/
+static void snd_trident_codec_write(ac97_t *ac97, unsigned short reg, unsigned short wdata)
+{
+	unsigned int address, data;
+	unsigned short count = 0xffff;
+	unsigned long flags;
+	trident_t *trident = ac97->private_data;
+
+	data = ((unsigned long) wdata) << 16;
+
+	spin_lock_irqsave(&trident->reg_lock, flags);
+	if (trident->device == TRIDENT_DEVICE_ID_DX) {
+		address = DX_ACR0_AC97_W;
+
+		/* read AC-97 write register status */
+		do {
+			if ((inw(TRID_REG(trident, address)) & DX_AC97_BUSY_WRITE) == 0)
+				break;
+		} while (--count);
+
+		data |= (DX_AC97_BUSY_WRITE | (reg & 0x000000ff));
+	} else if (trident->device == TRIDENT_DEVICE_ID_NX) {
+		address = NX_ACR1_AC97_W;
+
+		/* read AC-97 write register status */
+		do {
+			if ((inw(TRID_REG(trident, address)) & NX_AC97_BUSY_WRITE) == 0)
+				break;
+		} while (--count);
+
+		data |= (NX_AC97_BUSY_WRITE | (ac97->num << 8) | (reg & 0x000000ff));
+	} else if (trident->device == TRIDENT_DEVICE_ID_SI7018) {
+		address = SI_AC97_WRITE;
+
+		/* read AC-97 write register status */
+		do {
+			if ((inw(TRID_REG(trident, address)) & (SI_AC97_BUSY_WRITE)) == 0)
+				break;
+		} while (--count);
+
+		data |= SI_AC97_BUSY_WRITE | SI_AC97_AUDIO_BUSY | (reg & 0x000000ff);
+		if (ac97->num == 1)
+			data |= SI_AC97_SECONDARY;
+	} else {
+		address = 0;	/* keep GCC happy */
+		count = 0;	/* return */
+	}
+
+	if (count == 0) {
+		spin_unlock_irqrestore(&trident->reg_lock, flags);
+		return;
+	}
+	outl(data, TRID_REG(trident, address));
+	spin_unlock_irqrestore(&trident->reg_lock, flags);
+}
+
+/*---------------------------------------------------------------------------
+   void snd_trident_enable_eso(trident_t *trident)
+  
+   Description: This routine will enable end of loop interrupts.
+                End of loop interrupts will occur when a running
+                channel reaches ESO.
+                Also enables middle of loop interrupts.
+  
+   Parameters:  trident - pointer to target device class for 4DWave.
+  
+  ---------------------------------------------------------------------------*/
+
+static void snd_trident_enable_eso(trident_t * trident)
+{
+	unsigned int val;
+
+	val = inl(TRID_REG(trident, T4D_LFO_GC_CIR));
+	val |= ENDLP_IE;
+	val |= MIDLP_IE;
+	if (trident->device == TRIDENT_DEVICE_ID_SI7018)
+		val |= BANK_B_EN;
+	outl(val, TRID_REG(trident, T4D_LFO_GC_CIR));
+}
+
+/*---------------------------------------------------------------------------
+   void snd_trident_disable_eso(trident_t *trident)
+  
+   Description: This routine will disable end of loop interrupts.
+                End of loop interrupts will occur when a running
+                channel reaches ESO.
+                Also disables middle of loop interrupts.
+  
+   Parameters:  
+                trident - pointer to target device class for 4DWave.
+  
+   returns:     TRUE if everything went ok, else FALSE.
+  
+  ---------------------------------------------------------------------------*/
+
+static void snd_trident_disable_eso(trident_t * trident)
+{
+	unsigned int tmp;
+
+	tmp = inl(TRID_REG(trident, T4D_LFO_GC_CIR));
+	tmp &= ~ENDLP_IE;
+	tmp &= ~MIDLP_IE;
+	outl(tmp, TRID_REG(trident, T4D_LFO_GC_CIR));
+}
+
+/*---------------------------------------------------------------------------
+   void snd_trident_start_voice(trident_t * trident, unsigned int voice)
+
+    Description: Start a voice, any channel 0 thru 63.
+                 This routine automatically handles the fact that there are
+                 more than 32 channels available.
+
+    Parameters : voice - Voice number 0 thru n.
+                 trident - pointer to target device class for 4DWave.
+
+    Return Value: None.
+
+  ---------------------------------------------------------------------------*/
+
+void snd_trident_start_voice(trident_t * trident, unsigned int voice)
+{
+	unsigned int mask = 1 << (voice & 0x1f);
+	unsigned int reg = (voice & 0x20) ? T4D_START_B : T4D_START_A;
+
+	outl(mask, TRID_REG(trident, reg));
+}
+
+/*---------------------------------------------------------------------------
+   void snd_trident_stop_voice(trident_t * trident, unsigned int voice)
+
+    Description: Stop a voice, any channel 0 thru 63.
+                 This routine automatically handles the fact that there are
+                 more than 32 channels available.
+
+    Parameters : voice - Voice number 0 thru n.
+                 trident - pointer to target device class for 4DWave.
+
+    Return Value: None.
+
+  ---------------------------------------------------------------------------*/
+
+void snd_trident_stop_voice(trident_t * trident, unsigned int voice)
+{
+	unsigned int mask = 1 << (voice & 0x1f);
+	unsigned int reg = (voice & 0x20) ? T4D_STOP_B : T4D_STOP_A;
+
+	outl(mask, TRID_REG(trident, reg));
+}
+
+/*---------------------------------------------------------------------------
+    int snd_trident_allocate_pcm_channel(trident_t *trident)
+  
+    Description: Allocate hardware channel in Bank B (32-63).
+  
+    Parameters :  trident - pointer to target device class for 4DWave.
+  
+    Return Value: hardware channel - 32-63 or -1 when no channel is available
+  
+  ---------------------------------------------------------------------------*/
+
+static int snd_trident_allocate_pcm_channel(trident_t * trident)
+{
+	int idx;
+
+	if (trident->ChanPCMcnt >= trident->ChanPCM)
+		return -1;
+	for (idx = 31; idx >= 0; idx--) {
+		if (!(trident->ChanMap[T4D_BANK_B] & (1 << idx))) {
+			trident->ChanMap[T4D_BANK_B] |= 1 << idx;
+			trident->ChanPCMcnt++;
+			return idx + 32;
+		}
+	}
+	return -1;
+}
+
+/*---------------------------------------------------------------------------
+    void snd_trident_free_pcm_channel(int channel)
+  
+    Description: Free hardware channel in Bank B (32-63)
+  
+    Parameters :  trident - pointer to target device class for 4DWave.
+	          channel - hardware channel number 0-63
+  
+    Return Value: none
+  
+  ---------------------------------------------------------------------------*/
+
+static void snd_trident_free_pcm_channel(trident_t *trident, int channel)
+{
+	if (channel < 32 || channel > 63)
+		return;
+	channel &= 0x1f;
+	if (trident->ChanMap[T4D_BANK_B] & (1 << channel)) {
+		trident->ChanMap[T4D_BANK_B] &= ~(1 << channel);
+		trident->ChanPCMcnt--;
+	}
+}
+
+/*---------------------------------------------------------------------------
+    unsigned int snd_trident_allocate_synth_channel(void)
+  
+    Description: Allocate hardware channel in Bank A (0-31).
+  
+    Parameters :  trident - pointer to target device class for 4DWave.
+  
+    Return Value: hardware channel - 0-31 or -1 when no channel is available
+  
+  ---------------------------------------------------------------------------*/
+
+static int snd_trident_allocate_synth_channel(trident_t * trident)
+{
+	int idx;
+
+	for (idx = 31; idx >= 0; idx--) {
+		if (!(trident->ChanMap[T4D_BANK_A] & (1 << idx))) {
+			trident->ChanMap[T4D_BANK_A] |= 1 << idx;
+			trident->synth.ChanSynthCount++;
+			return idx;
+		}
+	}
+	return -1;
+}
+
+/*---------------------------------------------------------------------------
+    void snd_trident_free_synth_channel( int channel )
+  
+    Description: Free hardware channel in Bank B (0-31).
+  
+    Parameters :  trident - pointer to target device class for 4DWave.
+	          channel - hardware channel number 0-63
+  
+    Return Value: none
+  
+  ---------------------------------------------------------------------------*/
+
+static void snd_trident_free_synth_channel(trident_t *trident, int channel)
+{
+	if (channel < 0 || channel > 31)
+		return;
+	channel &= 0x1f;
+	if (trident->ChanMap[T4D_BANK_A] & (1 << channel)) {
+		trident->ChanMap[T4D_BANK_A] &= ~(1 << channel);
+		trident->synth.ChanSynthCount--;
+	}
+}
+
+/*---------------------------------------------------------------------------
+   snd_trident_write_voice_regs
+  
+   Description: This routine will complete and write the 5 hardware channel
+                registers to hardware.
+  
+   Paramters:   trident - pointer to target device class for 4DWave.
+                voice - synthesizer voice structure
+                Each register field.
+  
+  ---------------------------------------------------------------------------*/
+
+void snd_trident_write_voice_regs(trident_t * trident,
+				  snd_trident_voice_t * voice)
+{
+	unsigned int FmcRvolCvol;
+	unsigned int regs[5];
+
+	regs[1] = voice->LBA;
+	regs[4] = (voice->GVSel << 31) |
+		  ((voice->Pan & 0x0000007f) << 24) |
+		  ((voice->CTRL & 0x0000000f) << 12);
+	FmcRvolCvol = ((voice->FMC & 3) << 14) |
+	              ((voice->RVol & 0x7f) << 7) |
+	              (voice->CVol & 0x7f);
+
+	switch (trident->device) {
+	case TRIDENT_DEVICE_ID_SI7018:
+		regs[4] |= voice->number > 31 ?
+				(voice->Vol & 0x000003ff) :
+				((voice->Vol & 0x00003fc) << (16-2)) |
+				(voice->EC & 0x00000fff);
+		regs[0] = (voice->CSO << 16) | ((voice->Alpha & 0x00000fff) << 4) | (voice->FMS & 0x0000000f);
+		regs[2] = (voice->ESO << 16) | (voice->Delta & 0x0ffff);
+		regs[3] = (voice->Attribute << 16) | FmcRvolCvol;
+		break;
+	case TRIDENT_DEVICE_ID_DX:
+		regs[4] |= ((voice->Vol & 0x000003fc) << (16-2)) |
+			   (voice->EC & 0x00000fff);
+		regs[0] = (voice->CSO << 16) | ((voice->Alpha & 0x00000fff) << 4) | (voice->FMS & 0x0000000f);
+		regs[2] = (voice->ESO << 16) | (voice->Delta & 0x0ffff);
+		regs[3] = FmcRvolCvol;
+		break;
+	case TRIDENT_DEVICE_ID_NX:
+		regs[4] |= ((voice->Vol & 0x000003fc) << (16-2)) |
+			   (voice->EC & 0x00000fff);
+		regs[0] = (voice->Delta << 24) | (voice->CSO & 0x00ffffff);
+		regs[2] = ((voice->Delta << 16) & 0xff000000) | (voice->ESO & 0x00ffffff);
+		regs[3] = (voice->Alpha << 20) | ((voice->FMS & 0x0000000f) << 16) | FmcRvolCvol;
+		break;
+	default:
+		snd_BUG();
+	}
+
+	outb(voice->number, TRID_REG(trident, T4D_LFO_GC_CIR));
+	outl(regs[0], TRID_REG(trident, CH_START + 0));
+	outl(regs[1], TRID_REG(trident, CH_START + 4));
+	outl(regs[2], TRID_REG(trident, CH_START + 8));
+	outl(regs[3], TRID_REG(trident, CH_START + 12));
+	outl(regs[4], TRID_REG(trident, CH_START + 16));
+
+#if 0
+	printk("written %i channel:\n", voice->number);
+	printk("  regs[0] = 0x%x/0x%x\n", regs[0], inl(TRID_REG(trident, CH_START + 0)));
+	printk("  regs[1] = 0x%x/0x%x\n", regs[1], inl(TRID_REG(trident, CH_START + 4)));
+	printk("  regs[2] = 0x%x/0x%x\n", regs[2], inl(TRID_REG(trident, CH_START + 8)));
+	printk("  regs[3] = 0x%x/0x%x\n", regs[3], inl(TRID_REG(trident, CH_START + 12)));
+	printk("  regs[4] = 0x%x/0x%x\n", regs[4], inl(TRID_REG(trident, CH_START + 16)));
+#endif
+}
+
+/*---------------------------------------------------------------------------
+   snd_trident_write_cso_reg
+  
+   Description: This routine will write the new CSO offset
+                register to hardware.
+  
+   Paramters:   trident - pointer to target device class for 4DWave.
+                voice - synthesizer voice structure
+                CSO - new CSO value
+  
+  ---------------------------------------------------------------------------*/
+
+static void snd_trident_write_cso_reg(trident_t * trident, snd_trident_voice_t * voice, unsigned int CSO)
+{
+	voice->CSO = CSO;
+	outb(voice->number, TRID_REG(trident, T4D_LFO_GC_CIR));
+	if (trident->device != TRIDENT_DEVICE_ID_NX) {
+		outw(voice->CSO, TRID_REG(trident, CH_DX_CSO_ALPHA_FMS) + 2);
+	} else {
+		outl((voice->Delta << 24) | (voice->CSO & 0x00ffffff), TRID_REG(trident, CH_NX_DELTA_CSO));
+	}
+}
+
+/*---------------------------------------------------------------------------
+   snd_trident_write_eso_reg
+  
+   Description: This routine will write the new ESO offset
+                register to hardware.
+  
+   Paramters:   trident - pointer to target device class for 4DWave.
+                voice - synthesizer voice structure
+                ESO - new ESO value
+  
+  ---------------------------------------------------------------------------*/
+
+static void snd_trident_write_eso_reg(trident_t * trident, snd_trident_voice_t * voice, unsigned int ESO)
+{
+	voice->ESO = ESO;
+	outb(voice->number, TRID_REG(trident, T4D_LFO_GC_CIR));
+	if (trident->device != TRIDENT_DEVICE_ID_NX) {
+		outw(voice->ESO, TRID_REG(trident, CH_DX_ESO_DELTA) + 2);
+	} else {
+		outl(((voice->Delta << 16) & 0xff000000) | (voice->ESO & 0x00ffffff), TRID_REG(trident, CH_NX_DELTA_ESO));
+	}
+}
+
+/*---------------------------------------------------------------------------
+   snd_trident_write_vol_reg
+  
+   Description: This routine will write the new voice volume
+                register to hardware.
+  
+   Paramters:   trident - pointer to target device class for 4DWave.
+                voice - synthesizer voice structure
+                Vol - new voice volume
+  
+  ---------------------------------------------------------------------------*/
+
+static void snd_trident_write_vol_reg(trident_t * trident, snd_trident_voice_t * voice, unsigned int Vol)
+{
+	voice->Vol = Vol;
+	outb(voice->number, TRID_REG(trident, T4D_LFO_GC_CIR));
+	switch (trident->device) {
+	case TRIDENT_DEVICE_ID_DX:
+	case TRIDENT_DEVICE_ID_NX:
+		outb(voice->Vol >> 2, TRID_REG(trident, CH_GVSEL_PAN_VOL_CTRL_EC + 2));
+		break;
+	case TRIDENT_DEVICE_ID_SI7018:
+		// printk("voice->Vol = 0x%x\n", voice->Vol);
+		outw((voice->CTRL << 12) | voice->Vol, TRID_REG(trident, CH_GVSEL_PAN_VOL_CTRL_EC));
+		break;
+	}
+}
+
+/*---------------------------------------------------------------------------
+   snd_trident_write_pan_reg
+  
+   Description: This routine will write the new voice pan
+                register to hardware.
+  
+   Paramters:   trident - pointer to target device class for 4DWave.
+                voice - synthesizer voice structure
+                Pan - new pan value
+  
+  ---------------------------------------------------------------------------*/
+
+static void snd_trident_write_pan_reg(trident_t * trident, snd_trident_voice_t * voice, unsigned int Pan)
+{
+	voice->Pan = Pan;
+	outb(voice->number, TRID_REG(trident, T4D_LFO_GC_CIR));
+	outb(((voice->GVSel & 0x01) << 7) | (voice->Pan & 0x7f), TRID_REG(trident, CH_GVSEL_PAN_VOL_CTRL_EC + 3));
+}
+
+/*---------------------------------------------------------------------------
+   snd_trident_write_rvol_reg
+  
+   Description: This routine will write the new reverb volume
+                register to hardware.
+  
+   Paramters:   trident - pointer to target device class for 4DWave.
+                voice - synthesizer voice structure
+                RVol - new reverb volume
+  
+  ---------------------------------------------------------------------------*/
+
+static void snd_trident_write_rvol_reg(trident_t * trident, snd_trident_voice_t * voice, unsigned int RVol)
+{
+	voice->RVol = RVol;
+	outb(voice->number, TRID_REG(trident, T4D_LFO_GC_CIR));
+	outw(((voice->FMC & 0x0003) << 14) | ((voice->RVol & 0x007f) << 7) | (voice->CVol & 0x007f),
+	     TRID_REG(trident, trident->device == TRIDENT_DEVICE_ID_NX ? CH_NX_ALPHA_FMS_FMC_RVOL_CVOL : CH_DX_FMC_RVOL_CVOL));
+}
+
+/*---------------------------------------------------------------------------
+   snd_trident_write_cvol_reg
+  
+   Description: This routine will write the new chorus volume
+                register to hardware.
+  
+   Paramters:   trident - pointer to target device class for 4DWave.
+                voice - synthesizer voice structure
+                CVol - new chorus volume
+  
+  ---------------------------------------------------------------------------*/
+
+static void snd_trident_write_cvol_reg(trident_t * trident, snd_trident_voice_t * voice, unsigned int CVol)
+{
+	voice->CVol = CVol;
+	outb(voice->number, TRID_REG(trident, T4D_LFO_GC_CIR));
+	outw(((voice->FMC & 0x0003) << 14) | ((voice->RVol & 0x007f) << 7) | (voice->CVol & 0x007f),
+	     TRID_REG(trident, trident->device == TRIDENT_DEVICE_ID_NX ? CH_NX_ALPHA_FMS_FMC_RVOL_CVOL : CH_DX_FMC_RVOL_CVOL));
+}
+
+/*---------------------------------------------------------------------------
+   snd_trident_convert_rate
+
+   Description: This routine converts rate in HZ to hardware delta value.
+  
+   Paramters:   trident - pointer to target device class for 4DWave.
+                rate - Real or Virtual channel number.
+  
+   Returns:     Delta value.
+  
+  ---------------------------------------------------------------------------*/
+static unsigned int snd_trident_convert_rate(unsigned int rate)
+{
+	unsigned int delta;
+
+	// We special case 44100 and 8000 since rounding with the equation
+	// does not give us an accurate enough value. For 11025 and 22050
+	// the equation gives us the best answer. All other frequencies will
+	// also use the equation. JDW
+	if (rate == 44100)
+		delta = 0xeb3;
+	else if (rate == 8000)
+		delta = 0x2ab;
+	else if (rate == 48000)
+		delta = 0x1000;
+	else
+		delta = (((rate << 12) + 24000) / 48000) & 0x0000ffff;
+	return delta;
+}
+
+/*---------------------------------------------------------------------------
+   snd_trident_convert_adc_rate
+
+   Description: This routine converts rate in HZ to hardware delta value.
+  
+   Paramters:   trident - pointer to target device class for 4DWave.
+                rate - Real or Virtual channel number.
+  
+   Returns:     Delta value.
+  
+  ---------------------------------------------------------------------------*/
+static unsigned int snd_trident_convert_adc_rate(unsigned int rate)
+{
+	unsigned int delta;
+
+	// We special case 44100 and 8000 since rounding with the equation
+	// does not give us an accurate enough value. For 11025 and 22050
+	// the equation gives us the best answer. All other frequencies will
+	// also use the equation. JDW
+	if (rate == 44100)
+		delta = 0x116a;
+	else if (rate == 8000)
+		delta = 0x6000;
+	else if (rate == 48000)
+		delta = 0x1000;
+	else
+		delta = ((48000 << 12) / rate) & 0x0000ffff;
+	return delta;
+}
+
+/*---------------------------------------------------------------------------
+   snd_trident_spurious_threshold
+
+   Description: This routine converts rate in HZ to spurious threshold.
+  
+   Paramters:   trident - pointer to target device class for 4DWave.
+                rate - Real or Virtual channel number.
+  
+   Returns:     Delta value.
+  
+  ---------------------------------------------------------------------------*/
+static unsigned int snd_trident_spurious_threshold(unsigned int rate, unsigned int period_size)
+{
+	unsigned int res = (rate * period_size) / 48000;
+	if (res < 64)
+		res = res / 2;
+	else
+		res -= 32;
+	return res;
+}
+
+/*---------------------------------------------------------------------------
+   snd_trident_control_mode
+
+   Description: This routine returns a control mode for a PCM channel.
+  
+   Paramters:   trident - pointer to target device class for 4DWave.
+                substream  - PCM substream
+  
+   Returns:     Control value.
+  
+  ---------------------------------------------------------------------------*/
+static unsigned int snd_trident_control_mode(snd_pcm_substream_t *substream)
+{
+	unsigned int CTRL;
+	snd_pcm_runtime_t *runtime = substream->runtime;
+
+	/* set ctrl mode
+	   CTRL default: 8-bit (unsigned) mono, loop mode enabled
+	 */
+	CTRL = 0x00000001;
+	if (snd_pcm_format_width(runtime->format) == 16)
+		CTRL |= 0x00000008;	// 16-bit data
+	if (snd_pcm_format_signed(runtime->format))
+		CTRL |= 0x00000002;	// signed data
+	if (runtime->channels > 1)
+		CTRL |= 0x00000004;	// stereo data
+	return CTRL;
+}
+
+/*
+ *  PCM part
+ */
+
+/*---------------------------------------------------------------------------
+   snd_trident_ioctl
+  
+   Description: Device I/O control handler for playback/capture parameters.
+  
+   Paramters:   substream  - PCM substream class
+                cmd     - what ioctl message to process
+                arg     - additional message infoarg     
+  
+   Returns:     Error status
+  
+  ---------------------------------------------------------------------------*/
+
+static int snd_trident_ioctl(snd_pcm_substream_t * substream,
+			     unsigned int cmd,
+			     void *arg)
+{
+	/* FIXME: it seems that with small periods the behaviour of
+	          trident hardware is unpredictable and interrupt ge