patch-2.1.71 linux/drivers/net/hamradio/soundmodem/sm_sbc.c

• Lines: 942
• Date: Tue Aug 5 09:49:51 1997
• Orig file: v2.1.70/linux/drivers/net/hamradio/soundmodem/sm_sbc.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.70/linux/drivers/net/hamradio/soundmodem/sm_sbc.c linux/drivers/net/hamradio/soundmodem/sm_sbc.c
@@ -0,0 +1,941 @@
+/*****************************************************************************/
+
+/*
+ *	sm_sbc.c  -- soundcard radio modem driver soundblaster hardware driver
+ *
+ *	Copyright (C) 1996  Thomas Sailer (sailer@ife.ee.ethz.ch)
+ *
+ *	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.
+ *
+ *  Please note that the GPL allows you to use the driver, NOT the radio.
+ *  In order to use the radio, you need a license from the communications
+ *  authority of your country.
+ *
+ */
+
+#include <linux/ptrace.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <linux/ioport.h>
+#include <linux/soundmodem.h>
+#include "sm.h"
+#include "smdma.h"
+
+/* --------------------------------------------------------------------- */
+
+/*
+ * currently this module is supposed to support both module styles, i.e.
+ * the old one present up to about 2.1.9, and the new one functioning
+ * starting with 2.1.21. The reason is I have a kit allowing to compile
+ * this module also under 2.0.x which was requested by several people.
+ * This will go in 2.2
+ */
+#include <linux/version.h>
+
+#if LINUX_VERSION_CODE >= 0x20100
+#include <asm/uaccess.h>
+#else
+#include <asm/segment.h>
+#include <linux/mm.h>
+
+#undef put_user
+#undef get_user
+
+#define put_user(x,ptr) ({ __put_user((unsigned long)(x),(ptr),sizeof(*(ptr))); 0; })
+#define get_user(x,ptr) ({ x = ((__typeof__(*(ptr)))__get_user((ptr),sizeof(*(ptr)))); 0; })
+
+extern inline int copy_from_user(void *to, const void *from, unsigned long n)
+{
+        int i = verify_area(VERIFY_READ, from, n);
+        if (i)
+                return i;
+        memcpy_fromfs(to, from, n);
+        return 0;
+}
+
+extern inline int copy_to_user(void *to, const void *from, unsigned long n)
+{
+        int i = verify_area(VERIFY_WRITE, to, n);
+        if (i)
+                return i;
+        memcpy_tofs(to, from, n);
+        return 0;
+}
+#endif
+
+/* --------------------------------------------------------------------- */
+
+struct sc_state_sbc {
+	unsigned char revhi, revlo;
+	unsigned char fmt[2];
+	unsigned int sr[2];
+};
+
+#define SCSTATE ((struct sc_state_sbc *)(&sm->hw))
+
+/* --------------------------------------------------------------------- */
+/* 
+ * the sbc converter's registers 
+ */
+#define DSP_RESET(iobase)        (iobase+0x6)
+#define DSP_READ_DATA(iobase)    (iobase+0xa)
+#define DSP_WRITE_DATA(iobase)   (iobase+0xc)
+#define DSP_WRITE_STATUS(iobase) (iobase+0xc)
+#define DSP_DATA_AVAIL(iobase)   (iobase+0xe)
+#define DSP_MIXER_ADDR(iobase)   (iobase+0x4)
+#define DSP_MIXER_DATA(iobase)   (iobase+0x5)
+#define DSP_INTACK_16BIT(iobase) (iobase+0xf)
+#define SBC_EXTENT               16
+
+/* --------------------------------------------------------------------- */
+/*
+ * SBC commands
+ */
+#define SBC_OUTPUT             0x14
+#define SBC_INPUT              0x24
+#define SBC_BLOCKSIZE          0x48
+#define SBC_HI_OUTPUT          0x91 
+#define SBC_HI_INPUT           0x99 
+#define SBC_LO_OUTPUT_AUTOINIT 0x1c
+#define SBC_LO_INPUT_AUTOINIT  0x2c
+#define SBC_HI_OUTPUT_AUTOINIT 0x90 
+#define SBC_HI_INPUT_AUTOINIT  0x98
+#define SBC_IMMED_INT          0xf2
+#define SBC_GET_REVISION       0xe1
+#define ESS_GET_REVISION       0xe7
+#define SBC_SPEAKER_ON         0xd1
+#define SBC_SPEAKER_OFF        0xd3
+#define SBC_DMA_ON             0xd0
+#define SBC_DMA_OFF            0xd4
+#define SBC_SAMPLE_RATE        0x40
+#define SBC_SAMPLE_RATE_OUT    0x41
+#define SBC_SAMPLE_RATE_IN     0x42
+#define SBC_MONO_8BIT          0xa0
+#define SBC_MONO_16BIT         0xa4
+#define SBC_STEREO_8BIT        0xa8
+#define SBC_STEREO_16BIT       0xac
+
+#define SBC4_OUT8_AI           0xc6
+#define SBC4_IN8_AI            0xce
+#define SBC4_MODE_UNS_MONO     0x00
+#define SBC4_MODE_SIGN_MONO    0x10
+
+#define SBC4_OUT16_AI          0xb6
+#define SBC4_IN16_AI           0xbe
+
+/* --------------------------------------------------------------------- */
+
+static int inline reset_dsp(struct device *dev)
+{
+	int i;
+
+	outb(1, DSP_RESET(dev->base_addr));
+	for (i = 0; i < 0x100; i++)
+		SLOW_DOWN_IO;
+	outb(0, DSP_RESET(dev->base_addr));
+	for (i = 0; i < 0xffff; i++)
+		if (inb(DSP_DATA_AVAIL(dev->base_addr)) & 0x80)
+			if (inb(DSP_READ_DATA(dev->base_addr)) == 0xaa)
+				return 1;
+	return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static void inline write_dsp(struct device *dev, unsigned char data)
+{
+	int i;
+	
+	for (i = 0; i < 0xffff; i++)
+		if (!(inb(DSP_WRITE_STATUS(dev->base_addr)) & 0x80)) {
+			outb(data, DSP_WRITE_DATA(dev->base_addr));
+			return;
+		}
+}
+
+/* --------------------------------------------------------------------- */
+
+static int inline read_dsp(struct device *dev, unsigned char *data)
+{
+	int i;
+
+	if (!data)
+		return 0;
+	for (i = 0; i < 0xffff; i++) 
+		if (inb(DSP_DATA_AVAIL(dev->base_addr)) & 0x80) {
+			*data = inb(DSP_READ_DATA(dev->base_addr));
+			return 1;
+		}
+	return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static int config_resources(struct device *dev, struct sm_state *sm, int fdx)
+{
+	unsigned char irqreg = 0, dmareg = 0, realirq, realdma;
+	unsigned long flags;
+
+	switch (dev->irq) {
+	case 2:
+	case 9:
+		irqreg |= 0x01;
+		break;
+
+	case 5:
+		irqreg |= 0x02;
+		break;
+
+	case 7:
+		irqreg |= 0x04;
+		break;
+
+	case 10:
+		irqreg |= 0x08;
+		break;
+		
+	default:
+		return -ENODEV;
+	}
+
+	switch (dev->dma) {
+	case 0:
+		dmareg |= 0x01;
+		break;
+
+	case 1:
+		dmareg |= 0x02;
+		break;
+
+	case 3:
+		dmareg |= 0x08;
+		break;
+
+	default:
+		return -ENODEV;
+	}
+		
+	if (fdx) {
+		switch (sm->hdrv.ptt_out.dma2) {
+		case 5:
+			dmareg |= 0x20;
+			break;
+			
+		case 6:
+			dmareg |= 0x40;
+			break;
+			
+		case 7:
+			dmareg |= 0x80;
+			break;
+			
+		default:
+			return -ENODEV;
+		}
+	}
+	save_flags(flags);
+	cli();
+	outb(0x80, DSP_MIXER_ADDR(dev->base_addr));
+	outb(irqreg, DSP_MIXER_DATA(dev->base_addr));
+	realirq = inb(DSP_MIXER_DATA(dev->base_addr));
+	outb(0x81, DSP_MIXER_ADDR(dev->base_addr));
+	outb(dmareg, DSP_MIXER_DATA(dev->base_addr));
+	realdma = inb(DSP_MIXER_DATA(dev->base_addr));
+	restore_flags(flags);
+	if ((~realirq) & irqreg || (~realdma) & dmareg) {
+		printk(KERN_ERR "%s: sbc resource registers cannot be set; PnP device "
+		       "and IRQ/DMA specified wrongly?\n", sm_drvname);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static void inline sbc_int_ack_8bit(struct device *dev)
+{
+	inb(DSP_DATA_AVAIL(dev->base_addr));
+}
+
+/* --------------------------------------------------------------------- */
+
+static void inline sbc_int_ack_16bit(struct device *dev)
+{
+	inb(DSP_INTACK_16BIT(dev->base_addr));
+}
+
+/* --------------------------------------------------------------------- */
+
+static void setup_dma_dsp(struct device *dev, struct sm_state *sm, int send)
+{
+        unsigned long flags;
+        static const unsigned char sbcmode[2][2] = {
+		{ SBC_LO_INPUT_AUTOINIT, SBC_LO_OUTPUT_AUTOINIT }, 
+		{ SBC_HI_INPUT_AUTOINIT, SBC_HI_OUTPUT_AUTOINIT }
+	};
+	static const unsigned char sbc4mode[2] = { SBC4_IN8_AI, SBC4_OUT8_AI };
+	static const unsigned char sbcskr[2] = { SBC_SPEAKER_OFF, SBC_SPEAKER_ON };
+	unsigned int nsamps;
+
+	send = !!send;
+        if (!reset_dsp(dev)) {
+                printk(KERN_ERR "%s: sbc: cannot reset sb dsp\n", sm_drvname);
+                return;
+        }
+        save_flags(flags);
+        cli();
+        sbc_int_ack_8bit(dev);
+        write_dsp(dev, SBC_SAMPLE_RATE); /* set sampling rate */
+        write_dsp(dev, SCSTATE->fmt[send]);
+        write_dsp(dev, sbcskr[send]); 
+	nsamps = dma_setup(sm, send, dev->dma) - 1;
+        sbc_int_ack_8bit(dev);
+	if (SCSTATE->revhi >= 4) {
+		write_dsp(dev, sbc4mode[send]);
+		write_dsp(dev, SBC4_MODE_UNS_MONO);
+		write_dsp(dev, nsamps & 0xff);
+		write_dsp(dev, nsamps >> 8);
+	} else {
+		write_dsp(dev, SBC_BLOCKSIZE);
+		write_dsp(dev, nsamps & 0xff);
+		write_dsp(dev, nsamps >> 8);
+		write_dsp(dev, sbcmode[SCSTATE->fmt[send] >= 180][send]);
+		/* hispeed mode if sample rate > 13kHz */
+	}
+        restore_flags(flags);
+}
+
+/* --------------------------------------------------------------------- */
+
+static void sbc_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct device *dev = (struct device *)dev_id;
+	struct sm_state *sm = (struct sm_state *)dev->priv;
+	unsigned int curfrag;
+
+	if (!dev || !sm || sm->hdrv.magic != HDLCDRV_MAGIC)
+		return;
+	cli();
+ 	sbc_int_ack_8bit(dev);
+	disable_dma(dev->dma);
+	clear_dma_ff(dev->dma);
+	dma_ptr(sm, sm->dma.ptt_cnt > 0, dev->dma, &curfrag);
+	enable_dma(dev->dma);
+	sm_int_freq(sm);
+	sti();
+	if (sm->dma.ptt_cnt <= 0) {
+		dma_receive(sm, curfrag);
+		hdlcdrv_arbitrate(dev, &sm->hdrv);
+		if (hdlcdrv_ptt(&sm->hdrv)) {
+			/* starting to transmit */
+			disable_dma(dev->dma);
+			hdlcdrv_transmitter(dev, &sm->hdrv); /* prefill HDLC buffer */
+			dma_start_transmit(sm);
+			setup_dma_dsp(dev, sm, 1);
+			dma_transmit(sm);
+		}
+	} else if (dma_end_transmit(sm, curfrag)) {
+		/* stopping transmission */
+		disable_dma(dev->dma);
+		sti();
+		dma_init_receive(sm);
+		setup_dma_dsp(dev, sm, 0);
+        } else
+		dma_transmit(sm);
+	sm_output_status(sm);
+	hdlcdrv_transmitter(dev, &sm->hdrv);
+	hdlcdrv_receiver(dev, &sm->hdrv);
+
+}
+
+/* --------------------------------------------------------------------- */
+
+static int sbc_open(struct device *dev, struct sm_state *sm) 
+{
+	int err;
+	unsigned int dmasz, u;
+
+	if (sizeof(sm->m) < sizeof(struct sc_state_sbc)) {
+		printk(KERN_ERR "sm sbc: sbc state too big: %d > %d\n", 
+		       sizeof(struct sc_state_sbc), sizeof(sm->m));
+		return -ENODEV;
+	}
+	if (!dev || !sm)
+		return -ENXIO;
+	if (dev->base_addr <= 0 || dev->base_addr > 0x1000-SBC_EXTENT || 
+	    dev->irq < 2 || dev->irq > 15 || dev->dma > 3)
+		return -ENXIO;
+	if (check_region(dev->base_addr, SBC_EXTENT))
+		return -EACCES;
+	/*
+	 * check if a card is available
+	 */
+	if (!reset_dsp(dev)) {
+		printk(KERN_ERR "%s: sbc: no card at io address 0x%lx\n",
+		       sm_drvname, dev->base_addr);
+		return -ENODEV;
+	}
+	write_dsp(dev, SBC_GET_REVISION);
+	if (!read_dsp(dev, &SCSTATE->revhi) || 
+	    !read_dsp(dev, &SCSTATE->revlo))
+		return -ENODEV;
+	printk(KERN_INFO "%s: SoundBlaster DSP revision %d.%d\n", sm_drvname, 
+	       SCSTATE->revhi, SCSTATE->revlo);
+	if (SCSTATE->revhi < 2) {
+		printk(KERN_ERR "%s: your card is an antiquity, at least DSP "
+		       "rev 2.00 required\n", sm_drvname);
+		return -ENODEV;
+	}
+	if (SCSTATE->revhi < 3 && 
+	    (SCSTATE->fmt[0] >= 180 || SCSTATE->fmt[1] >= 180)) {
+		printk(KERN_ERR "%s: sbc io 0x%lx: DSP rev %d.%02d too "
+		       "old, at least 3.00 required\n", sm_drvname,
+		       dev->base_addr, SCSTATE->revhi, SCSTATE->revlo);
+		return -ENODEV;
+	}
+	if (SCSTATE->revhi >= 4 && 
+	    (err = config_resources(dev, sm, 0))) {
+		printk(KERN_ERR "%s: invalid IRQ and/or DMA specified\n", sm_drvname);
+		return err;
+	}
+	/*
+	 * initialize some variables
+	 */
+	dma_init_receive(sm);
+	dmasz = (NUM_FRAGMENTS + 1) * sm->dma.ifragsz;
+	u = NUM_FRAGMENTS * sm->dma.ofragsz;
+	if (u > dmasz)
+		dmasz = u;
+	if (!(sm->dma.ibuf = sm->dma.obuf = kmalloc(dmasz, GFP_KERNEL | GFP_DMA)))
+		return -ENOMEM;
+	dma_init_transmit(sm);
+	dma_init_receive(sm);
+
+	memset(&sm->m, 0, sizeof(sm->m));
+	memset(&sm->d, 0, sizeof(sm->d));
+	if (sm->mode_tx->init)
+		sm->mode_tx->init(sm);
+	if (sm->mode_rx->init)
+		sm->mode_rx->init(sm);
+
+	if (request_dma(dev->dma, sm->hwdrv->hw_name)) {
+		kfree_s(sm->dma.obuf, dmasz);
+		return -EBUSY;
+	}
+	if (request_irq(dev->irq, sbc_interrupt, SA_INTERRUPT, 
+			sm->hwdrv->hw_name, dev)) {
+		free_dma(dev->dma);
+		kfree_s(sm->dma.obuf, dmasz);
+		return -EBUSY;
+	}
+	request_region(dev->base_addr, SBC_EXTENT, sm->hwdrv->hw_name);
+	setup_dma_dsp(dev, sm, 0);
+	return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static int sbc_close(struct device *dev, struct sm_state *sm) 
+{
+	if (!dev || !sm)
+		return -EINVAL;
+	/*
+	 * disable interrupts
+	 */
+	disable_dma(dev->dma);
+	reset_dsp(dev);	
+	free_irq(dev->irq, dev);	
+	free_dma(dev->dma);	
+	release_region(dev->base_addr, SBC_EXTENT);
+	kfree(sm->dma.obuf);
+	return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static int sbc_sethw(struct device *dev, struct sm_state *sm, char *mode)
+{
+	char *cp = strchr(mode, '.');
+	const struct modem_tx_info **mtp = sm_modem_tx_table;
+	const struct modem_rx_info **mrp;
+
+	if (!strcmp(mode, "off")) {
+		sm->mode_tx = NULL;
+		sm->mode_rx = NULL;
+		return 0;
+	}
+	if (cp)
+		*cp++ = '\0';
+	else
+		cp = mode;
+	for (; *mtp; mtp++) {
+		if ((*mtp)->loc_storage > sizeof(sm->m)) {
+			printk(KERN_ERR "%s: insufficient storage for modulator %s (%d)\n",
+			       sm_drvname, (*mtp)->name, (*mtp)->loc_storage);
+			continue;
+		}
+		if (!(*mtp)->name || strcmp((*mtp)->name, mode))
+			continue;
+		if ((*mtp)->srate < 5000 || (*mtp)->srate > 44100)
+			continue;
+		if (!(*mtp)->modulator_u8)
+			continue;
+		for (mrp = sm_modem_rx_table; *mrp; mrp++) {
+			if ((*mrp)->loc_storage > sizeof(sm->d)) {
+				printk(KERN_ERR "%s: insufficient storage for demodulator %s (%d)\n",
+				       sm_drvname, (*mrp)->name, (*mrp)->loc_storage);
+				continue;
+			}
+			if (!(*mrp)->demodulator_u8)
+				continue;
+			if ((*mrp)->name && !strcmp((*mrp)->name, cp) &&
+			    (*mrp)->srate >= 5000 && (*mrp)->srate <= 44100) {
+				sm->mode_tx = *mtp;
+				sm->mode_rx = *mrp;
+				SCSTATE->fmt[0] = 256-((1000000L+sm->mode_rx->srate/2)/
+							 sm->mode_rx->srate);
+				SCSTATE->fmt[1] = 256-((1000000L+sm->mode_tx->srate/2)/
+							 sm->mode_tx->srate);
+				sm->dma.ifragsz = (sm->mode_rx->srate + 50)/100;
+				sm->dma.ofragsz = (sm->mode_tx->srate + 50)/100;
+				if (sm->dma.ifragsz < sm->mode_rx->overlap)
+					sm->dma.ifragsz = sm->mode_rx->overlap;
+				sm->dma.i16bit = sm->dma.o16bit = 0;
+				return 0;
+			}
+		}
+	}
+	return -EINVAL;
+}
+
+/* --------------------------------------------------------------------- */
+
+static int sbc_ioctl(struct device *dev, struct sm_state *sm, struct ifreq *ifr, 
+		     struct hdlcdrv_ioctl *hi, int cmd)
+{
+	struct sm_ioctl bi;
+	unsigned long flags;
+	int i;
+	
+	if (cmd != SIOCDEVPRIVATE)
+		return -ENOIOCTLCMD;
+
+	if (hi->cmd == HDLCDRVCTL_MODEMPARMASK)
+		return HDLCDRV_PARMASK_IOBASE | HDLCDRV_PARMASK_IRQ | 
+			HDLCDRV_PARMASK_DMA | HDLCDRV_PARMASK_SERIOBASE | 
+			HDLCDRV_PARMASK_PARIOBASE | HDLCDRV_PARMASK_MIDIIOBASE;
+
+	if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
+		return -EFAULT;
+
+	switch (bi.cmd) {
+	default:
+		return -ENOIOCTLCMD;
+
+	case SMCTL_GETMIXER:
+		i = 0;
+		bi.data.mix.sample_rate = sm->mode_rx->srate;
+		bi.data.mix.bit_rate = sm->hdrv.par.bitrate;
+		bi.data.mix.mixer_type = SM_MIXER_INVALID;
+		switch (SCSTATE->revhi) {
+		case 2:
+			bi.data.mix.mixer_type = SM_MIXER_CT1335;
+			break;
+		case 3:
+			bi.data.mix.mixer_type = SM_MIXER_CT1345;
+			break;
+		case 4:
+			bi.data.mix.mixer_type = SM_MIXER_CT1745;
+			break;
+		}
+		if (bi.data.mix.mixer_type != SM_MIXER_INVALID &&
+		    bi.data.mix.reg < 0x80) {
+			save_flags(flags);
+			cli();
+			outb(bi.data.mix.reg, DSP_MIXER_ADDR(dev->base_addr));
+			bi.data.mix.data = inb(DSP_MIXER_DATA(dev->base_addr));
+			restore_flags(flags);
+			i = 1;
+		}
+		if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
+			return -EFAULT;
+		return i;
+		
+	case SMCTL_SETMIXER:
+		if (!suser())
+			return -EACCES;
+		switch (SCSTATE->revhi) {
+		case 2:
+			if (bi.data.mix.mixer_type != SM_MIXER_CT1335)
+				return -EINVAL;
+			break;
+		case 3:
+			if (bi.data.mix.mixer_type != SM_MIXER_CT1345)
+				return -EINVAL;
+			break;
+		case 4:
+			if (bi.data.mix.mixer_type != SM_MIXER_CT1745)
+				return -EINVAL;
+			break;
+		default:
+			return -ENODEV;
+		}
+		if (bi.data.mix.reg >= 0x80)
+			return -EACCES;
+		save_flags(flags);
+		cli();
+		outb(bi.data.mix.reg, DSP_MIXER_ADDR(dev->base_addr));
+		outb(bi.data.mix.data, DSP_MIXER_DATA(dev->base_addr));
+		restore_flags(flags);
+		return 0;
+		
+	}
+	if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
+		return -EFAULT;
+	return 0;
+
+}
+
+/* --------------------------------------------------------------------- */
+
+const struct hardware_info sm_hw_sbc = {
+	"sbc", sizeof(struct sc_state_sbc), 
+	sbc_open, sbc_close, sbc_ioctl, sbc_sethw
+};
+
+/* --------------------------------------------------------------------- */
+
+static void setup_dma_fdx_dsp(struct device *dev, struct sm_state *sm)
+{
+        unsigned long flags;
+	unsigned int isamps, osamps;
+
+        if (!reset_dsp(dev)) {
+                printk(KERN_ERR "%s: sbc: cannot reset sb dsp\n", sm_drvname);
+                return;
+        }
+        save_flags(flags);
+        cli();
+        sbc_int_ack_8bit(dev);
+        sbc_int_ack_16bit(dev);
+	/* should eventually change to set rates individually by SBC_SAMPLE_RATE_{IN/OUT} */
+	write_dsp(dev, SBC_SAMPLE_RATE_IN);
+	write_dsp(dev, SCSTATE->sr[0] >> 8);
+	write_dsp(dev, SCSTATE->sr[0] & 0xff);
+	write_dsp(dev, SBC_SAMPLE_RATE_OUT);
+	write_dsp(dev, SCSTATE->sr[1] >> 8);
+	write_dsp(dev, SCSTATE->sr[1] & 0xff);
+        write_dsp(dev, SBC_SPEAKER_ON);
+	if (sm->dma.o16bit) {
+		/*
+		 * DMA channel 1 (8bit) does input (capture),
+		 * DMA channel 2 (16bit) does output (playback)
+		 */
+		isamps = dma_setup(sm, 0, dev->dma) - 1;
+		osamps = dma_setup(sm, 1, sm->hdrv.ptt_out.dma2) - 1;
+		sbc_int_ack_8bit(dev);
+		sbc_int_ack_16bit(dev);
+		write_dsp(dev, SBC4_IN8_AI);
+		write_dsp(dev, SBC4_MODE_UNS_MONO);
+		write_dsp(dev, isamps & 0xff);
+		write_dsp(dev, isamps >> 8);
+		write_dsp(dev, SBC4_OUT16_AI);
+		write_dsp(dev, SBC4_MODE_SIGN_MONO);
+		write_dsp(dev, osamps & 0xff);
+		write_dsp(dev, osamps >> 8);
+	} else {
+		/*
+		 * DMA channel 1 (8bit) does output (playback),
+		 * DMA channel 2 (16bit) does input (capture)
+		 */
+		isamps = dma_setup(sm, 0, sm->hdrv.ptt_out.dma2) - 1;
+		osamps = dma_setup(sm, 1, dev->dma) - 1;
+		sbc_int_ack_8bit(dev);
+		sbc_int_ack_16bit(dev);
+		write_dsp(dev, SBC4_OUT8_AI);
+		write_dsp(dev, SBC4_MODE_UNS_MONO);
+		write_dsp(dev, osamps & 0xff);
+		write_dsp(dev, osamps >> 8);
+		write_dsp(dev, SBC4_IN16_AI);
+		write_dsp(dev, SBC4_MODE_SIGN_MONO);
+		write_dsp(dev, isamps & 0xff);
+		write_dsp(dev, isamps >> 8);
+	}
+	dma_init_receive(sm);
+	dma_init_transmit(sm);
+        restore_flags(flags);
+}
+
+/* --------------------------------------------------------------------- */
+
+static void sbcfdx_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct device *dev = (struct device *)dev_id;
+	struct sm_state *sm = (struct sm_state *)dev->priv;
+	unsigned char intsrc, pbint = 0, captint = 0;
+	unsigned int ocfrag, icfrag;
+	unsigned long flags;
+
+	if (!dev || !sm || sm->hdrv.magic != HDLCDRV_MAGIC)
+		return;
+	save_flags(flags);
+	cli();
+	outb(0x82, DSP_MIXER_ADDR(dev->base_addr));
+	intsrc = inb(DSP_MIXER_DATA(dev->base_addr));
+	if (intsrc & 0x01) {
+		sbc_int_ack_8bit(dev);
+		if (sm->dma.o16bit) {
+			captint = 1;
+			disable_dma(dev->dma);
+			clear_dma_ff(dev->dma);
+			dma_ptr(sm, 0, dev->dma, &icfrag);
+			enable_dma(dev->dma);
+		} else {     
+			pbint = 1;
+			disable_dma(dev->dma);
+			clear_dma_ff(dev->dma);
+			dma_ptr(sm, 1, dev->dma, &ocfrag);
+			enable_dma(dev->dma);
+		}
+	}
+	if (intsrc & 0x02) {
+		sbc_int_ack_16bit(dev);
+		if (sm->dma.o16bit) {
+			pbint = 1;
+			disable_dma(sm->hdrv.ptt_out.dma2);
+			clear_dma_ff(sm->hdrv.ptt_out.dma2);
+			dma_ptr(sm, 1, sm->hdrv.ptt_out.dma2, &ocfrag);
+			enable_dma(sm->hdrv.ptt_out.dma2);
+		} else {
+			captint = 1;
+			disable_dma(sm->hdrv.ptt_out.dma2);
+			clear_dma_ff(sm->hdrv.ptt_out.dma2);
+			dma_ptr(sm, 0, sm->hdrv.ptt_out.dma2, &icfrag);
+			enable_dma(sm->hdrv.ptt_out.dma2);
+		}
+	}
+	restore_flags(flags);
+	sm_int_freq(sm);
+	sti();
+	if (pbint) {
+		if (dma_end_transmit(sm, ocfrag))
+			dma_clear_transmit(sm);
+		dma_transmit(sm);
+	}
+	if (captint) { 
+		dma_receive(sm, icfrag);
+		hdlcdrv_arbitrate(dev, &sm->hdrv);
+	}
+	sm_output_status(sm);
+	hdlcdrv_transmitter(dev, &sm->hdrv);
+	hdlcdrv_receiver(dev, &sm->hdrv);
+}
+
+/* --------------------------------------------------------------------- */
+
+static int sbcfdx_open(struct device *dev, struct sm_state *sm) 
+{
+	int err;
+
+	if (sizeof(sm->m) < sizeof(struct sc_state_sbc)) {
+		printk(KERN_ERR "sm sbc: sbc state too big: %d > %d\n", 
+		       sizeof(struct sc_state_sbc), sizeof(sm->m));
+		return -ENODEV;
+	}
+	if (!dev || !sm)
+		return -ENXIO;
+	if (dev->base_addr <= 0 || dev->base_addr > 0x1000-SBC_EXTENT || 
+	    dev->irq < 2 || dev->irq > 15 || dev->dma > 3)
+		return -ENXIO;
+	if (check_region(dev->base_addr, SBC_EXTENT))
+		return -EACCES;
+	/*
+	 * check if a card is available
+	 */
+	if (!reset_dsp(dev)) {
+		printk(KERN_ERR "%s: sbc: no card at io address 0x%lx\n",
+		       sm_drvname, dev->base_addr);
+		return -ENODEV;
+	}
+	write_dsp(dev, SBC_GET_REVISION);
+	if (!read_dsp(dev, &SCSTATE->revhi) || 
+	    !read_dsp(dev, &SCSTATE->revlo))
+		return -ENODEV;
+	printk(KERN_INFO "%s: SoundBlaster DSP revision %d.%d\n", sm_drvname, 
+	       SCSTATE->revhi, SCSTATE->revlo);
+	if (SCSTATE->revhi < 4) {
+		printk(KERN_ERR "%s: at least DSP rev 4.00 required\n", sm_drvname);
+		return -ENODEV;
+	}
+	if ((err = config_resources(dev, sm, 1))) {
+		printk(KERN_ERR "%s: invalid IRQ and/or DMA specified\n", sm_drvname);
+		return err;
+	}
+	/*
+	 * initialize some variables
+	 */
+	if (!(sm->dma.ibuf = kmalloc(sm->dma.ifragsz * (NUM_FRAGMENTS+1), GFP_KERNEL | GFP_DMA)))
+		return -ENOMEM;
+	if (!(sm->dma.obuf = kmalloc(sm->dma.ofragsz * NUM_FRAGMENTS, GFP_KERNEL | GFP_DMA))) {
+		kfree(sm->dma.ibuf);
+		return -ENOMEM;
+	}
+	dma_init_transmit(sm);
+	dma_init_receive(sm);
+
+	memset(&sm->m, 0, sizeof(sm->m));
+	memset(&sm->d, 0, sizeof(sm->d));
+	if (sm->mode_tx->init)
+		sm->mode_tx->init(sm);
+	if (sm->mode_rx->init)
+		sm->mode_rx->init(sm);
+
+	if (request_dma(dev->dma, sm->hwdrv->hw_name)) {
+		kfree(sm->dma.ibuf);
+		kfree(sm->dma.obuf);
+		return -EBUSY;
+	}
+	if (request_dma(sm->hdrv.ptt_out.dma2, sm->hwdrv->hw_name)) {
+		kfree(sm->dma.ibuf);
+		kfree(sm->dma.obuf);
+		free_dma(dev->dma);
+		return -EBUSY;
+	}
+	if (request_irq(dev->irq, sbcfdx_interrupt, SA_INTERRUPT, 
+			sm->hwdrv->hw_name, dev)) {
+		kfree(sm->dma.ibuf);
+		kfree(sm->dma.obuf);
+		free_dma(dev->dma);
+		free_dma(sm->hdrv.ptt_out.dma2);
+		return -EBUSY;
+	}
+	request_region(dev->base_addr, SBC_EXTENT, sm->hwdrv->hw_name);
+	setup_dma_fdx_dsp(dev, sm);
+	return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static int sbcfdx_close(struct device *dev, struct sm_state *sm) 
+{
+	if (!dev || !sm)
+		return -EINVAL;
+	/*
+	 * disable interrupts
+	 */
+	disable_dma(dev->dma);
+	disable_dma(sm->hdrv.ptt_out.dma2);
+	reset_dsp(dev);	
+	free_irq(dev->irq, dev);	
+	free_dma(dev->dma);	
+	free_dma(sm->hdrv.ptt_out.dma2);	
+	release_region(dev->base_addr, SBC_EXTENT);
+	kfree(sm->dma.ibuf);
+	kfree(sm->dma.obuf);
+	return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static int sbcfdx_sethw(struct device *dev, struct sm_state *sm, char *mode)
+{
+	char *cp = strchr(mode, '.');
+	const struct modem_tx_info **mtp = sm_modem_tx_table;
+	const struct modem_rx_info **mrp;
+
+	if (!strcmp(mode, "off")) {
+		sm->mode_tx = NULL;
+		sm->mode_rx = NULL;
+		return 0;
+	}
+	if (cp)
+		*cp++ = '\0';
+	else
+		cp = mode;
+	for (; *mtp; mtp++) {
+		if ((*mtp)->loc_storage > sizeof(sm->m)) {
+			printk(KERN_ERR "%s: insufficient storage for modulator %s (%d)\n",
+			       sm_drvname, (*mtp)->name, (*mtp)->loc_storage);
+			continue;
+		}
+		if (!(*mtp)->name || strcmp((*mtp)->name, mode))
+			continue;
+		if ((*mtp)->srate < 5000 || (*mtp)->srate > 44100)
+			continue;
+		for (mrp = sm_modem_rx_table; *mrp; mrp++) {
+			if ((*mrp)->loc_storage > sizeof(sm->d)) {
+				printk(KERN_ERR "%s: insufficient storage for demodulator %s (%d)\n",
+				       sm_drvname, (*mrp)->name, (*mrp)->loc_storage);
+				continue;
+			}
+			if ((*mrp)->name && !strcmp((*mrp)->name, cp) &&
+			    (*mtp)->srate >= 5000 && (*mtp)->srate <= 44100 &&
+			    (*mrp)->srate == (*mtp)->srate) {
+				sm->mode_tx = *mtp;
+				sm->mode_rx = *mrp;
+				SCSTATE->sr[0] = sm->mode_rx->srate;
+				SCSTATE->sr[1] = sm->mode_tx->srate;
+				sm->dma.ifragsz = (sm->mode_rx->srate + 50)/100;
+				sm->dma.ofragsz = (sm->mode_tx->srate + 50)/100;
+				if (sm->dma.ifragsz < sm->mode_rx->overlap)
+					sm->dma.ifragsz = sm->mode_rx->overlap;
+				if (sm->mode_rx->demodulator_s16 && sm->mode_tx->modulator_u8) {
+					sm->dma.i16bit = 1;
+					sm->dma.o16bit = 0;
+					sm->dma.ifragsz <<= 1;
+				} else if (sm->mode_rx->demodulator_u8 && sm->mode_tx->modulator_s16) {
+					sm->dma.i16bit = 0;
+					sm->dma.o16bit = 1;
+					sm->dma.ofragsz <<= 1;
+				} else {
+					printk(KERN_INFO "%s: mode %s or %s unusable\n", sm_drvname, 
+					       sm->mode_rx->name, sm->mode_tx->name);
+					sm->mode_tx = NULL;
+					sm->mode_rx = NULL;
+					return -EINVAL;
+				}
+				return 0;
+			}
+		}
+	}
+	return -EINVAL;
+}
+
+/* --------------------------------------------------------------------- */
+
+static int sbcfdx_ioctl(struct device *dev, struct sm_state *sm, struct ifreq *ifr, 
+			struct hdlcdrv_ioctl *hi, int cmd)
+{
+	if (cmd != SIOCDEVPRIVATE)
+		return -ENOIOCTLCMD;
+
+	if (hi->cmd == HDLCDRVCTL_MODEMPARMASK)
+		return HDLCDRV_PARMASK_IOBASE | HDLCDRV_PARMASK_IRQ | 
+			HDLCDRV_PARMASK_DMA | HDLCDRV_PARMASK_DMA2 | HDLCDRV_PARMASK_SERIOBASE | 
+			HDLCDRV_PARMASK_PARIOBASE | HDLCDRV_PARMASK_MIDIIOBASE;
+
+	return sbc_ioctl(dev, sm, ifr, hi, cmd);
+}
+
+/* --------------------------------------------------------------------- */
+
+const struct hardware_info sm_hw_sbcfdx = {
+	"sbcfdx", sizeof(struct sc_state_sbc), 
+	sbcfdx_open, sbcfdx_close, sbcfdx_ioctl, sbcfdx_sethw
+};
+
+/* --------------------------------------------------------------------- */