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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [sound/] [sb_ess.c] - Blame information for rev 1765

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#undef FKS_LOGGING
#undef FKS_TEST
 
/*
 * tabs should be 4 spaces, in vi(m): set tabstop=4
 *
 * TODO:        consistency speed calculations!!
 *                      cleanup!
 * ????:        Did I break MIDI support?
 *
 * History:
 *
 * Rolf Fokkens  (Dec 20 1998): ES188x recording level support on a per
 * fokkensr@vertis.nl                   input basis.
 *                               (Dec 24 1998): Recognition of ES1788, ES1887, ES1888,
 *                                                              ES1868, ES1869 and ES1878. Could be used for
 *                                                              specific handling in the future. All except
 *                                                              ES1887 and ES1888 and ES688 are handled like
 *                                                              ES1688.
 *                               (Dec 27 1998): RECLEV for all (?) ES1688+ chips. ES188x now
 *                                                              have the "Dec 20" support + RECLEV
 *                               (Jan  2 1999): Preparation for Full Duplex. This means
 *                                                              Audio 2 is now used for playback when dma16
 *                                                              is specified. The next step would be to use
 *                                                              Audio 1 and Audio 2 at the same time.
 *                               (Jan  9 1999): Put all ESS stuff into sb_ess.[ch], this
 *                                                              includes both the ESS stuff that has been in
 *                                                              sb_*[ch] before I touched it and the ESS support
 *                                                              I added later
 *                               (Jan 23 1999): Full Duplex seems to work. I wrote a small
 *                                                              test proggy which works OK. Haven't found
 *                                                              any applications to test it though. So why did
 *                                                              I bother to create it anyway?? :) Just for
 *                                                              fun.
 *                               (May  2 1999): I tried to be too smart by "introducing"
 *                                                              ess_calc_best_speed (). The idea was that two
 *                                                              dividers could be used to setup a samplerate,
 *                                                              ess_calc_best_speed () would choose the best.
 *                                                              This works for playback, but results in
 *                                                              recording problems for high samplerates. I
 *                                                              fixed this by removing ess_calc_best_speed ()
 *                                                              and just doing what the documentation says.
 * Andy Sloane   (Jun  4 1999): Stole some code from ALSA to fix the playback
 * andy@guildsoftware.com               speed on ES1869, ES1879, ES1887, and ES1888.
 *                                                              1879's were previously ignored by this driver;
 *                                                              added (untested) support for those.
 * Cvetan Ivanov (Oct 27 1999): Fixed ess_dsp_init to call ess_set_dma_hw for
 * zezo@inet.bg                                 _ALL_ ESS models, not only ES1887
 *
 * This files contains ESS chip specifics. It's based on the existing ESS
 * handling as it resided in sb_common.c, sb_mixer.c and sb_audio.c. This
 * file adds features like:
 * - Chip Identification (as shown in /proc/sound)
 * - RECLEV support for ES1688 and later
 * - 6 bits playback level support chips later than ES1688
 * - Recording level support on a per-device basis for ES1887
 * - Full-Duplex for ES1887
 *
 * Full duplex is enabled by specifying dma16. While the normal dma must
 * be one of 0, 1 or 3, dma16 can be one of 0, 1, 3 or 5. DMA 5 is a 16 bit
 * DMA channel, while the others are 8 bit..
 *
 * ESS detection isn't full proof (yet). If it fails an additional module
 * parameter esstype can be specified to be one of the following:
 * -1, 0, 688, 1688, 1868, 1869, 1788, 1887, 1888
 * -1 means: mimic 2.0 behaviour,
 *  0 means: auto detect.
 *   others: explicitly specify chip
 * -1 is default, cause auto detect still doesn't work.
 */
 
/*
 * About the documentation
 *
 * I don't know if the chips all are OK, but the documentation is buggy. 'cause
 * I don't have all the cips myself, there's a lot I cannot verify. I'll try to
 * keep track of my latest insights about his here. If you have additional info,
 * please enlighten me (fokkensr@vertis.nl)!
 *
 * I had the impression that ES1688 also has 6 bit master volume control. The
 * documentation about ES1888 (rev C, october '95) claims that ES1888 has
 * the following features ES1688 doesn't have:
 * - 6 bit master volume
 * - Full Duplex
 * So ES1688 apparently doesn't have 6 bit master volume control, but the
 * ES1688 does have RECLEV control. Makes me wonder: does ES688 have it too?
 * Without RECLEV ES688 won't be much fun I guess.
 *
 * From the ES1888 (rev C, october '95) documentation I got the impression
 * that registers 0x68 to 0x6e don't exist which means: no recording volume
 * controls. To my surprise the ES888 documentation (1/14/96) claims that
 * ES888 does have these record mixer registers, but that ES1888 doesn't have
 * 0x69 and 0x6b. So the rest should be there.
 *
 * I'm trying to get ES1887 Full Duplex. Audio 2 is playback only, while Audio 2
 * is both record and playback. I think I should use Audio 2 for all playback.
 *
 * The documentation is an adventure: it's close but not fully accurate. I
 * found out that after a reset some registers are *NOT* reset, though the
 * docs say the would be. Interresting ones are 0x7f, 0x7d and 0x7a. They are
 * related to the Audio 2 channel. I also was suprised about the consequenses
 * of writing 0x00 to 0x7f (which should be done by reset): The ES1887 moves
 * into ES1888 mode. This means that it claims IRQ 11, which happens to be my
 * ISDN adapter. Needless to say it no longer worked. I now understand why
 * after rebooting 0x7f already was 0x05, the value of my choice: the BIOS
 * did it.
 *
 * Oh, and this is another trap: in ES1887 docs mixer register 0x70 is decribed
 * as if it's exactly the same as register 0xa1. This is *NOT* true. The
 * description of 0x70 in ES1869 docs is accurate however.
 * Well, the assumption about ES1869 was wrong: register 0x70 is very much
 * like register 0xa1, except that bit 7 is allways 1, whatever you want
 * it to be.
 *
 * When using audio 2 mixer register 0x72 seems te be meaningless. Only 0xa2
 * has effect.
 *
 * Software reset not being able to reset all registers is great! Especially
 * the fact that register 0x78 isn't reset is great when you wanna change back
 * to single dma operation (simplex): audio 2 is still operation, and uses the
 * same dma as audio 1: your ess changes into a funny echo machine.
 *
 * Received the new that ES1688 is detected as a ES1788. Did some thinking:
 * the ES1887 detection scheme suggests in step 2 to try if bit 3 of register
 * 0x64 can be changed. This is inaccurate, first I inverted the * check: "If
 * can be modified, it's a 1688", which lead to a correct detection
 * of my ES1887. It resulted however in bad detection of 1688 (reported by mail)
 * and 1868 (if no PnP detection first): they result in a 1788 being detected.
 * I don't have docs on 1688, but I do have docs on 1868: The documentation is
 * probably inaccurate in the fact that I should check bit 2, not bit 3. This
 * is what I do now.
 */
 
/*
 * About recognition of ESS chips
 *
 * The distinction of ES688, ES1688, ES1788, ES1887 and ES1888 is described in
 * a (preliminary ??) datasheet on ES1887. It's aim is to identify ES1887, but
 * during detection the text claims that "this chip may be ..." when a step
 * fails. This scheme is used to distinct between the above chips.
 * It appears however that some PnP chips like ES1868 are recognized as ES1788
 * by the ES1887 detection scheme. These PnP chips can be detected in another
 * way however: ES1868, ES1869 and ES1878 can be recognized (full proof I think)
 * by repeatedly reading mixer register 0x40. This is done by ess_identify in
 * sb_common.c.
 * This results in the following detection steps:
 * - distinct between ES688 and ES1688+ (as always done in this driver)
 *   if ES688 we're ready
 * - try to detect ES1868, ES1869 or ES1878
 *   if successful we're ready
 * - try to detect ES1888, ES1887 or ES1788
 *   if successful we're ready
 * - Dunno. Must be 1688. Will do in general
 *
 * About RECLEV support:
 *
 * The existing ES1688 support didn't take care of the ES1688+ recording
 * levels very well. Whenever a device was selected (recmask) for recording
 * it's recording level was loud, and it couldn't be changed. The fact that
 * internal register 0xb4 could take care of RECLEV, didn't work meaning until
 * it's value was restored every time the chip was reset; this reset the
 * value of 0xb4 too. I guess that's what 4front also had (have?) trouble with.
 *
 * About ES1887 support:
 *
 * The ES1887 has separate registers to control the recording levels, for all
 * inputs. The ES1887 specific software makes these levels the same as their
 * corresponding playback levels, unless recmask says they aren't recorded. In
 * the latter case the recording volumes are 0.
 * Now recording levels of inputs can be controlled, by changing the playback
 * levels. Futhermore several devices can be recorded together (which is not
 * possible with the ES1688.
 * Besides the separate recording level control for each input, the common
 * recordig level can also be controlled by RECLEV as described above.
 *
 * Not only ES1887 have this recording mixer. I know the following from the
 * documentation:
 * ES688        no
 * ES1688       no
 * ES1868       no
 * ES1869       yes
 * ES1878       no
 * ES1879       yes
 * ES1888       no/yes  Contradicting documentation; most recent: yes
 * ES1946       yes             This is a PCI chip; not handled by this driver
 */
 
#include <linux/delay.h>
#include <linux/spinlock.h>
 
#include "sound_config.h"
#include "sb_mixer.h"
#include "sb.h"
 
#include "sb_ess.h"
 
#define ESSTYPE_LIKE20  -1              /* Mimic 2.0 behaviour                                  */
#define ESSTYPE_DETECT  0                /* Mimic 2.0 behaviour                                  */
 
#define SUBMDL_ES1788   0x10    /* Subtype ES1788 for specific handling */
#define SUBMDL_ES1868   0x11    /* Subtype ES1868 for specific handling */
#define SUBMDL_ES1869   0x12    /* Subtype ES1869 for specific handling */
#define SUBMDL_ES1878   0x13    /* Subtype ES1878 for specific handling */
#define SUBMDL_ES1879   0x16    /* ES1879 was initially forgotten */
#define SUBMDL_ES1887   0x14    /* Subtype ES1887 for specific handling */
#define SUBMDL_ES1888   0x15    /* Subtype ES1888 for specific handling */
 
#define SB_CAP_ES18XX_RATE 0x100
 
#define ES1688_CLOCK1 795444 /* 128 - div */
#define ES1688_CLOCK2 397722 /* 256 - div */
#define ES18XX_CLOCK1 793800 /* 128 - div */
#define ES18XX_CLOCK2 768000 /* 256 - div */
 
#ifdef FKS_LOGGING
static void ess_show_mixerregs (sb_devc *devc);
#endif
static int ess_read (sb_devc * devc, unsigned char reg);
static int ess_write (sb_devc * devc, unsigned char reg, unsigned char data);
static void ess_chgmixer
        (sb_devc * devc, unsigned int reg, unsigned int mask, unsigned int val);
 
/****************************************************************************
 *                                                                                                                                                      *
 *                                                                      ESS audio                                                               *
 *                                                                                                                                                      *
 ****************************************************************************/
 
struct ess_command {short cmd; short data;};
 
/*
 * Commands for initializing Audio 1 for input (record)
 */
static struct ess_command ess_i08m[] =          /* input 8 bit mono */
        { {0xb7, 0x51}, {0xb7, 0xd0}, {-1, 0} };
static struct ess_command ess_i16m[] =          /* input 16 bit mono */
        { {0xb7, 0x71}, {0xb7, 0xf4}, {-1, 0} };
static struct ess_command ess_i08s[] =          /* input 8 bit stereo */
        { {0xb7, 0x51}, {0xb7, 0x98}, {-1, 0} };
static struct ess_command ess_i16s[] =          /* input 16 bit stereo */
        { {0xb7, 0x71}, {0xb7, 0xbc}, {-1, 0} };
 
static struct ess_command *ess_inp_cmds[] =
        { ess_i08m, ess_i16m, ess_i08s, ess_i16s };
 
 
/*
 * Commands for initializing Audio 1 for output (playback)
 */
static struct ess_command ess_o08m[] =          /* output 8 bit mono */
        { {0xb6, 0x80}, {0xb7, 0x51}, {0xb7, 0xd0}, {-1, 0} };
static struct ess_command ess_o16m[] =          /* output 16 bit mono */
        { {0xb6, 0x00}, {0xb7, 0x71}, {0xb7, 0xf4}, {-1, 0} };
static struct ess_command ess_o08s[] =          /* output 8 bit stereo */
        { {0xb6, 0x80}, {0xb7, 0x51}, {0xb7, 0x98}, {-1, 0} };
static struct ess_command ess_o16s[] =          /* output 16 bit stereo */
        { {0xb6, 0x00}, {0xb7, 0x71}, {0xb7, 0xbc}, {-1, 0} };
 
static struct ess_command *ess_out_cmds[] =
        { ess_o08m, ess_o16m, ess_o08s, ess_o16s };
 
static void ess_exec_commands
        (sb_devc *devc, struct ess_command *cmdtab[])
{
        struct ess_command *cmd;
 
        cmd = cmdtab [ ((devc->channels != 1) << 1) + (devc->bits != AFMT_U8) ];
 
        while (cmd->cmd != -1) {
                ess_write (devc, cmd->cmd, cmd->data);
                cmd++;
        }
}
 
static void ess_change
        (sb_devc *devc, unsigned int reg, unsigned int mask, unsigned int val)
{
        int value;
 
        value = ess_read (devc, reg);
        value = (value & ~mask) | (val & mask);
        ess_write (devc, reg, value);
}
 
static void ess_set_output_parms
        (int dev, unsigned long buf, int nr_bytes, int intrflag)
{
        sb_devc *devc = audio_devs[dev]->devc;
 
        if (devc->duplex) {
                devc->trg_buf_16 = buf;
                devc->trg_bytes_16 = nr_bytes;
                devc->trg_intrflag_16 = intrflag;
                devc->irq_mode_16 = IMODE_OUTPUT;
        } else {
                devc->trg_buf = buf;
                devc->trg_bytes = nr_bytes;
                devc->trg_intrflag = intrflag;
                devc->irq_mode = IMODE_OUTPUT;
        }
}
 
static void ess_set_input_parms
        (int dev, unsigned long buf, int count, int intrflag)
{
        sb_devc *devc = audio_devs[dev]->devc;
 
        devc->trg_buf = buf;
        devc->trg_bytes = count;
        devc->trg_intrflag = intrflag;
        devc->irq_mode = IMODE_INPUT;
}
 
static int ess_calc_div (int clock, int revert, int *speedp, int *diffp)
{
        int divider;
        int speed, diff;
        int retval;
 
        speed   = *speedp;
        divider = (clock + speed / 2) / speed;
        retval  = revert - divider;
        if (retval > revert - 1) {
                retval  = revert - 1;
                divider = revert - retval;
        }
        /* This line is suggested. Must be wrong I think
        *speedp = (clock + divider / 2) / divider;
        So I chose the next one */
 
        *speedp = clock / divider;
        diff    = speed - *speedp;
        if (diff < 0) diff =-diff;
        *diffp  = diff;
 
        return retval;
}
 
static int ess_calc_best_speed
        (int clock1, int rev1, int clock2, int rev2, int *divp, int *speedp)
{
        int speed1 = *speedp, speed2 = *speedp;
        int div1, div2;
        int diff1, diff2;
        int retval;
 
        div1 = ess_calc_div (clock1, rev1, &speed1, &diff1);
        div2 = ess_calc_div (clock2, rev2, &speed2, &diff2);
 
        if (diff1 < diff2) {
                *divp   = div1;
                *speedp = speed1;
                retval  = 1;
        } else {
        /*      *divp   = div2; */
                *divp   = 0x80 | div2;
                *speedp = speed2;
                retval  = 2;
        }
 
        return retval;
}
 
/*
 * Depending on the audiochannel ESS devices can
 * have different clock settings. These are made consistent for duplex
 * however.
 * callers of ess_speed only do an audionum suggestion, which means
 * input suggests 1, output suggests 2. This suggestion is only true
 * however when doing duplex.
 */
static void ess_common_speed (sb_devc *devc, int *speedp, int *divp)
{
        int diff = 0, div;
 
        if (devc->duplex) {
                /*
                 * The 0x80 is important for the first audio channel
                 */
                if (devc->submodel == SUBMDL_ES1888) {
                        div = 0x80 | ess_calc_div (795500, 256, speedp, &diff);
                } else {
                        div = 0x80 | ess_calc_div (795500, 128, speedp, &diff);
                }
        } else if(devc->caps & SB_CAP_ES18XX_RATE) {
                if (devc->submodel == SUBMDL_ES1888) {
                        ess_calc_best_speed(397700, 128, 795500, 256,
                                                &div, speedp);
                } else {
                        ess_calc_best_speed(ES18XX_CLOCK1, 128, ES18XX_CLOCK2, 256,
                                                &div, speedp);
                }
        } else {
                if (*speedp > 22000) {
                        div = 0x80 | ess_calc_div (ES1688_CLOCK1, 256, speedp, &diff);
                } else {
                        div = 0x00 | ess_calc_div (ES1688_CLOCK2, 128, speedp, &diff);
                }
        }
        *divp = div;
}
 
static void ess_speed (sb_devc *devc, int audionum)
{
        int speed;
        int div, div2;
 
        ess_common_speed (devc, &(devc->speed), &div);
 
#ifdef FKS_REG_LOGGING
printk (KERN_INFO "FKS: ess_speed (%d) b speed = %d, div=%x\n", audionum, devc->speed, div);
#endif
 
        /* Set filter roll-off to 90% of speed/2 */
        speed = (devc->speed * 9) / 20;
 
        div2 = 256 - 7160000 / (speed * 82);
 
        if (!devc->duplex) audionum = 1;
 
        if (audionum == 1) {
                /* Change behaviour of register A1 *
                sb_chg_mixer(devc, 0x71, 0x20, 0x20)
                * For ES1869 only??? */
                ess_write (devc, 0xa1, div);
                ess_write (devc, 0xa2, div2);
        } else {
                ess_setmixer (devc, 0x70, div);
                /*
                 * FKS: fascinating: 0x72 doesn't seem to work.
                 */
                ess_write (devc, 0xa2, div2);
                ess_setmixer (devc, 0x72, div2);
        }
}
 
static int ess_audio_prepare_for_input(int dev, int bsize, int bcount)
{
        sb_devc *devc = audio_devs[dev]->devc;
 
        ess_speed(devc, 1);
 
        sb_dsp_command(devc, DSP_CMD_SPKOFF);
 
        ess_write (devc, 0xb8, 0x0e);   /* Auto init DMA mode */
        ess_change (devc, 0xa8, 0x03, 3 - devc->channels);      /* Mono/stereo */
        ess_write (devc, 0xb9, 2);      /* Demand mode (4 bytes/DMA request) */
 
        ess_exec_commands (devc, ess_inp_cmds);
 
        ess_change (devc, 0xb1, 0xf0, 0x50);
        ess_change (devc, 0xb2, 0xf0, 0x50);
 
        devc->trigger_bits = 0;
        return 0;
}
 
static int ess_audio_prepare_for_output_audio1 (int dev, int bsize, int bcount)
{
        sb_devc *devc = audio_devs[dev]->devc;
 
        sb_dsp_reset(devc);
        ess_speed(devc, 1);
        ess_write (devc, 0xb8, 4);      /* Auto init DMA mode */
        ess_change (devc, 0xa8, 0x03, 3 - devc->channels);      /* Mono/stereo */
        ess_write (devc, 0xb9, 2);      /* Demand mode (4 bytes/request) */
 
        ess_exec_commands (devc, ess_out_cmds);
 
        ess_change (devc, 0xb1, 0xf0, 0x50);    /* Enable DMA */
        ess_change (devc, 0xb2, 0xf0, 0x50);    /* Enable IRQ */
 
        sb_dsp_command(devc, DSP_CMD_SPKON);    /* There be sound! */
 
        devc->trigger_bits = 0;
        return 0;
}
 
static int ess_audio_prepare_for_output_audio2 (int dev, int bsize, int bcount)
{
        sb_devc *devc = audio_devs[dev]->devc;
        unsigned char bits;
 
/* FKS: qqq
        sb_dsp_reset(devc);
*/
 
        /*
         * Auto-Initialize:
         * DMA mode + demand mode (8 bytes/request, yes I want it all!)
         * But leave 16-bit DMA bit untouched!
         */
        ess_chgmixer (devc, 0x78, 0xd0, 0xd0);
 
        ess_speed(devc, 2);
 
        /* bits 4:3 on ES1887 represent recording source. Keep them! */
        bits = ess_getmixer (devc, 0x7a) & 0x18;
 
        /* Set stereo/mono */
        if (devc->channels != 1) bits |= 0x02;
 
        /* Init DACs; UNSIGNED mode for 8 bit; SIGNED mode for 16 bit */
        if (devc->bits != AFMT_U8) bits |= 0x05;        /* 16 bit */
 
        /* Enable DMA, IRQ will be shared (hopefully)*/
        bits |= 0x60;
 
        ess_setmixer (devc, 0x7a, bits);
 
        ess_mixer_reload (devc, SOUND_MIXER_PCM);       /* There be sound! */
 
        devc->trigger_bits = 0;
        return 0;
}
 
static int ess_audio_prepare_for_output(int dev, int bsize, int bcount)
{
        sb_devc *devc = audio_devs[dev]->devc;
 
#ifdef FKS_REG_LOGGING
printk(KERN_INFO "ess_audio_prepare_for_output: dma_out=%d,dma_in=%d\n"
, audio_devs[dev]->dmap_out->dma, audio_devs[dev]->dmap_in->dma);
#endif
 
        if (devc->duplex) {
                return ess_audio_prepare_for_output_audio2 (dev, bsize, bcount);
        } else {
                return ess_audio_prepare_for_output_audio1 (dev, bsize, bcount);
        }
}
 
static void ess_audio_halt_xfer(int dev)
{
        unsigned long flags;
        sb_devc *devc = audio_devs[dev]->devc;
 
        spin_lock_irqsave(&devc->lock, flags);
        sb_dsp_reset(devc);
        spin_unlock_irqrestore(&devc->lock, flags);
 
        /*
         * Audio 2 may still be operational! Creates awful sounds!
         */
        if (devc->duplex) ess_chgmixer(devc, 0x78, 0x03, 0x00);
}
 
static void ess_audio_start_input
        (int dev, unsigned long buf, int nr_bytes, int intrflag)
{
        int count = nr_bytes;
        sb_devc *devc = audio_devs[dev]->devc;
        short c = -nr_bytes;
 
        /*
         * Start a DMA input to the buffer pointed by dmaqtail
         */
 
        if (audio_devs[dev]->dmap_in->dma > 3) count >>= 1;
        count--;
 
        devc->irq_mode = IMODE_INPUT;
 
        ess_write (devc, 0xa4, (unsigned char) ((unsigned short) c & 0xff));
        ess_write (devc, 0xa5, (unsigned char) (((unsigned short) c >> 8) & 0xff));
 
        ess_change (devc, 0xb8, 0x0f, 0x0f);    /* Go */
        devc->intr_active = 1;
}
 
static void ess_audio_output_block_audio1
        (int dev, unsigned long buf, int nr_bytes, int intrflag)
{
        int count = nr_bytes;
        sb_devc *devc = audio_devs[dev]->devc;
        short c = -nr_bytes;
 
        if (audio_devs[dev]->dmap_out->dma > 3)
                count >>= 1;
        count--;
 
        devc->irq_mode = IMODE_OUTPUT;
 
        ess_write (devc, 0xa4, (unsigned char) ((unsigned short) c & 0xff));
        ess_write (devc, 0xa5, (unsigned char) (((unsigned short) c >> 8) & 0xff));
 
        ess_change (devc, 0xb8, 0x05, 0x05);    /* Go */
        devc->intr_active = 1;
}
 
static void ess_audio_output_block_audio2
        (int dev, unsigned long buf, int nr_bytes, int intrflag)
{
        int count = nr_bytes;
        sb_devc *devc = audio_devs[dev]->devc;
        short c = -nr_bytes;
 
        if (audio_devs[dev]->dmap_out->dma > 3) count >>= 1;
        count--;
 
        ess_setmixer (devc, 0x74, (unsigned char) ((unsigned short) c & 0xff));
        ess_setmixer (devc, 0x76, (unsigned char) (((unsigned short) c >> 8) & 0xff));
        ess_chgmixer (devc, 0x78, 0x03, 0x03);   /* Go */
 
        devc->irq_mode_16 = IMODE_OUTPUT;
                devc->intr_active_16 = 1;
}
 
static void ess_audio_output_block
        (int dev, unsigned long buf, int nr_bytes, int intrflag)
{
        sb_devc *devc = audio_devs[dev]->devc;
 
        if (devc->duplex) {
                ess_audio_output_block_audio2 (dev, buf, nr_bytes, intrflag);
        } else {
                ess_audio_output_block_audio1 (dev, buf, nr_bytes, intrflag);
        }
}
 
/*
 * FKS: the if-statements for both bits and bits_16 are quite alike.
 * Combine this...
 */
static void ess_audio_trigger(int dev, int bits)
{
        sb_devc *devc = audio_devs[dev]->devc;
 
        int bits_16 = bits & devc->irq_mode_16;
        bits &= devc->irq_mode;
 
        if (!bits && !bits_16) {
                /* FKS oh oh.... wrong?? for dma 16? */
                sb_dsp_command(devc, 0xd0);     /* Halt DMA */
        }
 
        if (bits) {
                switch (devc->irq_mode)
                {
                        case IMODE_INPUT:
                                ess_audio_start_input(dev, devc->trg_buf, devc->trg_bytes,
                                        devc->trg_intrflag);
                                break;
 
                        case IMODE_OUTPUT:
                                ess_audio_output_block(dev, devc->trg_buf, devc->trg_bytes,
                                        devc->trg_intrflag);
                                break;
                }
        }
 
        if (bits_16) {
                switch (devc->irq_mode_16) {
                case IMODE_INPUT:
                        ess_audio_start_input(dev, devc->trg_buf_16, devc->trg_bytes_16,
                                        devc->trg_intrflag_16);
                        break;
 
                case IMODE_OUTPUT:
                        ess_audio_output_block(dev, devc->trg_buf_16, devc->trg_bytes_16,
                                        devc->trg_intrflag_16);
                        break;
                }
        }
 
        devc->trigger_bits = bits | bits_16;
}
 
static int ess_audio_set_speed(int dev, int speed)
{
        sb_devc *devc = audio_devs[dev]->devc;
        int minspeed, maxspeed, dummydiv;
 
        if (speed > 0) {
                minspeed = (devc->duplex ? 6215  : 5000 );
                maxspeed = (devc->duplex ? 44100 : 48000);
                if (speed < minspeed) speed = minspeed;
                if (speed > maxspeed) speed = maxspeed;
 
                ess_common_speed (devc, &speed, &dummydiv);
 
                devc->speed = speed;
        }
        return devc->speed;
}
 
/*
 * FKS: This is a one-on-one copy of sb1_audio_set_bits
 */
static unsigned int ess_audio_set_bits(int dev, unsigned int bits)
{
        sb_devc *devc = audio_devs[dev]->devc;
 
        if (bits != 0) {
                if (bits == AFMT_U8 || bits == AFMT_S16_LE) {
                        devc->bits = bits;
                } else {
                        devc->bits = AFMT_U8;
                }
        }
 
        return devc->bits;
}
 
/*
 * FKS: This is a one-on-one copy of sbpro_audio_set_channels
 * (*) Modified it!!
 */
static short ess_audio_set_channels(int dev, short channels)
{
        sb_devc *devc = audio_devs[dev]->devc;
 
        if (channels == 1 || channels == 2) devc->channels = channels;
 
        return devc->channels;
}
 
static struct audio_driver ess_audio_driver =   /* ESS ES688/1688 */
{
        owner:                  THIS_MODULE,
        open:                   sb_audio_open,
        close:                  sb_audio_close,
        output_block:   ess_set_output_parms,
        start_input:    ess_set_input_parms,
        prepare_for_input:      ess_audio_prepare_for_input,
        prepare_for_output:     ess_audio_prepare_for_output,
        halt_io:                ess_audio_halt_xfer,
        trigger:                ess_audio_trigger,
        set_speed:              ess_audio_set_speed,
        set_bits:               ess_audio_set_bits,
        set_channels:   ess_audio_set_channels
};
 
/*
 * ess_audio_init must be called from sb_audio_init
 */
struct audio_driver *ess_audio_init
                (sb_devc *devc, int *audio_flags, int *format_mask)
{
        *audio_flags = DMA_AUTOMODE;
        *format_mask |= AFMT_S16_LE;
 
        if (devc->duplex) {
                int tmp_dma;
                /*
                 * sb_audio_init thinks dma8 is for playback and
                 * dma16 is for record. Not now! So swap them.
                 */
                tmp_dma         = devc->dma16;
                devc->dma16     = devc->dma8;
                devc->dma8      = tmp_dma;
 
                *audio_flags |= DMA_DUPLEX;
        }
 
        return &ess_audio_driver;
}
 
/****************************************************************************
 *                                                                                                                                                      *
 *                                                              ESS common                                                                      *
 *                                                                                                                                                      *
 ****************************************************************************/
static void ess_handle_channel
        (char *channel, int dev, int intr_active, unsigned char flag, int irq_mode)
{
        if (!intr_active || !flag) return;
#ifdef FKS_REG_LOGGING
printk(KERN_INFO "FKS: ess_handle_channel %s irq_mode=%d\n", channel, irq_mode);
#endif
        switch (irq_mode) {
                case IMODE_OUTPUT:
                        DMAbuf_outputintr (dev, 1);
                        break;
 
                case IMODE_INPUT:
                        DMAbuf_inputintr (dev);
                        break;
 
                case IMODE_INIT:
                        break;
 
                default:;
                        /* printk(KERN_WARN "ESS: Unexpected interrupt\n"); */
        }
}
 
/*
 * FKS: TODO!!! Finish this!
 *
 * I think midi stuff uses uart401, without interrupts.
 * So IMODE_MIDI isn't a value for devc->irq_mode.
 */
void ess_intr (sb_devc *devc)
{
        int                             status;
        unsigned char   src;
 
        if (devc->submodel == SUBMDL_ES1887) {
                src = ess_getmixer (devc, 0x7f) >> 4;
        } else {
                src = 0xff;
        }
 
#ifdef FKS_REG_LOGGING
printk(KERN_INFO "FKS: sbintr src=%x\n",(int)src);
#endif
        ess_handle_channel
                ( "Audio 1"
                , devc->dev, devc->intr_active   , src & 0x01, devc->irq_mode   );
        ess_handle_channel
                ( "Audio 2"
                , devc->dev, devc->intr_active_16, src & 0x02, devc->irq_mode_16);
        /*
         * Acknowledge interrupts
         */
        if (devc->submodel == SUBMDL_ES1887 && (src & 0x02)) {
                ess_chgmixer (devc, 0x7a, 0x80, 0x00);
        }
 
        if (src & 0x01) {
                status = inb(DSP_DATA_AVAIL);
        }
}
 
static void ess_extended (sb_devc * devc)
{
        /* Enable extended mode */
 
        sb_dsp_command(devc, 0xc6);
}
 
static int ess_write (sb_devc * devc, unsigned char reg, unsigned char data)
{
#ifdef FKS_REG_LOGGING
printk(KERN_INFO "FKS: write reg %x: %x\n", reg, data);
#endif
        /* Write a byte to an extended mode register of ES1688 */
 
        if (!sb_dsp_command(devc, reg))
                return 0;
 
        return sb_dsp_command(devc, data);
}
 
static int ess_read (sb_devc * devc, unsigned char reg)
{
        /* Read a byte from an extended mode register of ES1688 */
 
        /* Read register command */
        if (!sb_dsp_command(devc, 0xc0)) return -1;
 
        if (!sb_dsp_command(devc, reg )) return -1;
 
        return sb_dsp_get_byte(devc);
}
 
int ess_dsp_reset(sb_devc * devc)
{
        int loopc;
 
#ifdef FKS_REG_LOGGING
printk(KERN_INFO "FKS: ess_dsp_reset 1\n");
ess_show_mixerregs (devc);
#endif
 
        DEB(printk("Entered ess_dsp_reset()\n"));
 
        outb(3, DSP_RESET); /* Reset FIFO too */
 
        udelay(10);
        outb(0, DSP_RESET);
        udelay(30);
 
        for (loopc = 0; loopc < 1000 && !(inb(DSP_DATA_AVAIL) & 0x80); loopc++);
 
        if (inb(DSP_READ) != 0xAA) {
                DDB(printk("sb: No response to RESET\n"));
                return 0;   /* Sorry */
        }
        ess_extended (devc);
 
        DEB(printk("sb_dsp_reset() OK\n"));
 
#ifdef FKS_LOGGING
printk(KERN_INFO "FKS: dsp_reset 2\n");
ess_show_mixerregs (devc);
#endif
 
        return 1;
}
 
static int ess_irq_bits (int irq)
{
        switch (irq) {
        case 2:
        case 9:
                return 0;
 
        case 5:
                return 1;
 
        case 7:
                return 2;
 
        case 10:
                return 3;
 
        default:
                printk(KERN_ERR "ESS1688: Invalid IRQ %d\n", irq);
                return -1;
        }
}
 
/*
 *      Set IRQ configuration register for all ESS models
 */
static int ess_common_set_irq_hw (sb_devc * devc)
{
        int irq_bits;
 
        if ((irq_bits = ess_irq_bits (devc->irq)) == -1) return 0;
 
        if (!ess_write (devc, 0xb1, 0x50 | (irq_bits << 2))) {
                printk(KERN_ERR "ES1688: Failed to write to IRQ config register\n");
                return 0;
        }
        return 1;
}
 
/*
 * I wanna use modern ES1887 mixer irq handling. Funny is the
 * fact that my BIOS wants the same. But suppose someone's BIOS
 * doesn't do this!
 * This is independent of duplex. If there's a 1887 this will
 * prevent it from going into 1888 mode.
 */
static void ess_es1887_set_irq_hw (sb_devc * devc)
{
        int irq_bits;
 
        if ((irq_bits = ess_irq_bits (devc->irq)) == -1) return;
 
        ess_chgmixer (devc, 0x7f, 0x0f, 0x01 | ((irq_bits + 1) << 1));
}
 
static int ess_set_irq_hw (sb_devc * devc)
{
        if (devc->submodel == SUBMDL_ES1887) ess_es1887_set_irq_hw (devc);
 
        return ess_common_set_irq_hw (devc);
}
 
#ifdef FKS_TEST
 
/*
 * FKS_test:
 *      for ES1887: 00, 18, non wr bits: 0001 1000
 *      for ES1868: 00, b8, non wr bits: 1011 1000
 *      for ES1888: 00, f8, non wr bits: 1111 1000
 *      for ES1688: 00, f8, non wr bits: 1111 1000
 *      +   ES968
 */
 
static void FKS_test (sb_devc * devc)
{
        int val1, val2;
        val1 = ess_getmixer (devc, 0x64);
        ess_setmixer (devc, 0x64, ~val1);
        val2 = ess_getmixer (devc, 0x64) ^ ~val1;
        ess_setmixer (devc, 0x64, val1);
        val1 ^= ess_getmixer (devc, 0x64);
printk (KERN_INFO "FKS: FKS_test %02x, %02x\n", (val1 & 0x0ff), (val2 & 0x0ff));
};
#endif
 
static unsigned int ess_identify (sb_devc * devc)
{
        unsigned int val;
        unsigned long flags;
 
        spin_lock_irqsave(&devc->lock, flags);
        outb(((unsigned char) (0x40 & 0xff)), MIXER_ADDR);
 
        udelay(20);
        val  = inb(MIXER_DATA) << 8;
        udelay(20);
        val |= inb(MIXER_DATA);
        udelay(20);
        spin_unlock_irqrestore(&devc->lock, flags);
 
        return val;
}
 
/*
 * ESS technology describes a detection scheme in their docs. It involves
 * fiddling with the bits in certain mixer registers. ess_probe is supposed
 * to help.
 *
 * FKS: tracing shows ess_probe writes wrong value to 0x64. Bit 3 reads 1, but
 * should be written 0 only. Check this.
 */
static int ess_probe (sb_devc * devc, int reg, int xorval)
{
        int  val1, val2, val3;
 
        val1 = ess_getmixer (devc, reg);
        val2 = val1 ^ xorval;
        ess_setmixer (devc, reg, val2);
        val3 = ess_getmixer (devc, reg);
        ess_setmixer (devc, reg, val1);
 
        return (val2 == val3);
}
 
int ess_init(sb_devc * devc, struct address_info *hw_config)
{
        unsigned char cfg;
        int ess_major = 0, ess_minor = 0;
        int i;
        static char name[100], modelname[10];
 
        /*
         * Try to detect ESS chips.
         */
 
        sb_dsp_command(devc, 0xe7); /* Return identification */
 
        for (i = 1000; i; i--) {
                if (inb(DSP_DATA_AVAIL) & 0x80) {
                        if (ess_major == 0) {
                                ess_major = inb(DSP_READ);
                        } else {
                                ess_minor = inb(DSP_READ);
                                break;
                        }
                }
        }
 
        if (ess_major == 0) return 0;
 
        if (ess_major == 0x48 && (ess_minor & 0xf0) == 0x80) {
                sprintf(name, "ESS ES488 AudioDrive (rev %d)",
                        ess_minor & 0x0f);
                hw_config->name = name;
                devc->model = MDL_SBPRO;
                return 1;
        }
 
        /*
         * This the detection heuristic of ESS technology, though somewhat
         * changed to actually make it work.
         * This results in the following detection steps:
         * - distinct between ES688 and ES1688+ (as always done in this driver)
         *   if ES688 we're ready
         * - try to detect ES1868, ES1869 or ES1878 (ess_identify)
         *   if successful we're ready
         * - try to detect ES1888, ES1887 or ES1788 (aim: detect ES1887)
         *   if successful we're ready
         * - Dunno. Must be 1688. Will do in general
         *
         * This is the most BETA part of the software: Will the detection
         * always work?
         */
        devc->model = MDL_ESS;
        devc->submodel = ess_minor & 0x0f;
 
        if (ess_major == 0x68 && (ess_minor & 0xf0) == 0x80) {
                char *chip = NULL;
                int submodel = -1;
 
                switch (devc->sbmo.esstype) {
                case ESSTYPE_DETECT:
                case ESSTYPE_LIKE20:
                        break;
                case 688:
                        submodel = 0x00;
                        break;
                case 1688:
                        submodel = 0x08;
                        break;
                case 1868:
                        submodel = SUBMDL_ES1868;
                        break;
                case 1869:
                        submodel = SUBMDL_ES1869;
                        break;
                case 1788:
                        submodel = SUBMDL_ES1788;
                        break;
                case 1878:
                        submodel = SUBMDL_ES1878;
                        break;
                case 1879:
                        submodel = SUBMDL_ES1879;
                        break;
                case 1887:
                        submodel = SUBMDL_ES1887;
                        break;
                case 1888:
                        submodel = SUBMDL_ES1888;
                        break;
                default:
                        printk (KERN_ERR "Invalid esstype=%d specified\n", devc->sbmo.esstype);
                        return 0;
                };
                if (submodel != -1) {
                        devc->submodel = submodel;
                        sprintf (modelname, "ES%d", devc->sbmo.esstype);
                        chip = modelname;
                };
                if (chip == NULL && (ess_minor & 0x0f) < 8) {
                        chip = "ES688";
                };
#ifdef FKS_TEST
FKS_test (devc);
#endif
                /*
                 * If Nothing detected yet, and we want 2.0 behaviour...
                 * Then let's assume it's ES1688.
                 */
                if (chip == NULL && devc->sbmo.esstype == ESSTYPE_LIKE20) {
                        chip = "ES1688";
                };
 
                if (chip == NULL) {
                        int type;
 
                        type = ess_identify (devc);
 
                        switch (type) {
                        case 0x1868:
                                chip = "ES1868";
                                devc->submodel = SUBMDL_ES1868;
                                break;
                        case 0x1869:
                                chip = "ES1869";
                                devc->submodel = SUBMDL_ES1869;
                                break;
                        case 0x1878:
                                chip = "ES1878";
                                devc->submodel = SUBMDL_ES1878;
                                break;
                        case 0x1879:
                                chip = "ES1879";
                                devc->submodel = SUBMDL_ES1879;
                                break;
                        default:
                                if ((type & 0x00ff) != ((type >> 8) & 0x00ff)) {
                                        printk ("ess_init: Unrecognized %04x\n", type);
                                }
                        };
                };
#if 0
                /*
                 * this one failed:
                 * the probing of bit 4 is another thought: from ES1788 and up, all
                 * chips seem to have hardware volume control. Bit 4 is readonly to
                 * check if a hardware volume interrupt has fired.
                 * Cause ES688/ES1688 don't have this feature, bit 4 might be writeable
                 * for these chips.
                 */
                if (chip == NULL && !ess_probe(devc, 0x64, (1 << 4))) {
#endif
                /*
                 * the probing of bit 2 is my idea. The ES1887 docs want me to probe
                 * bit 3. This results in ES1688 being detected as ES1788.
                 * Bit 2 is for "Enable HWV IRQE", but as ES(1)688 chips don't have
                 * HardWare Volume, I think they don't have this IRQE.
                 */
                if (chip == NULL && ess_probe(devc, 0x64, (1 << 2))) {
                        if (ess_probe (devc, 0x70, 0x7f)) {
                                if (ess_probe (devc, 0x64, (1 << 5))) {
                                        chip = "ES1887";
                                        devc->submodel = SUBMDL_ES1887;
                                } else {
                                        chip = "ES1888";
                                        devc->submodel = SUBMDL_ES1888;
                                }
                        } else {
                                chip = "ES1788";
                                devc->submodel = SUBMDL_ES1788;
                        }
                };
                if (chip == NULL) {
                        chip = "ES1688";
                };
 
            printk ( KERN_INFO "ESS chip %s %s%s\n"
               , chip
               , ( devc->sbmo.esstype == ESSTYPE_DETECT || devc->sbmo.esstype == ESSTYPE_LIKE20
                 ? "detected"
                 : "specified"
                 )
               , ( devc->sbmo.esstype == ESSTYPE_LIKE20
                 ? " (kernel 2.0 compatible)"
                 : ""
                 )
               );
 
                sprintf(name,"ESS %s AudioDrive (rev %d)", chip, ess_minor & 0x0f);
        } else {
                strcpy(name, "Jazz16");
        }
 
        /* AAS: info stolen from ALSA: these boards have different clocks */
        switch(devc->submodel) {
/* APPARENTLY NOT 1869 AND 1887
                case SUBMDL_ES1869:
                case SUBMDL_ES1887:
*/
                case SUBMDL_ES1888:
                        devc->caps |= SB_CAP_ES18XX_RATE;
                        break;
        }
 
        hw_config->name = name;
        /* FKS: sb_dsp_reset to enable extended mode???? */
        sb_dsp_reset(devc); /* Turn on extended mode */
 
        /*
         *  Enable joystick and OPL3
         */
        cfg = ess_getmixer (devc, 0x40);
        ess_setmixer (devc, 0x40, cfg | 0x03);
        if (devc->submodel >= 8) {              /* ES1688 */
                devc->caps |= SB_NO_MIDI;   /* ES1688 uses MPU401 MIDI mode */
        }
        sb_dsp_reset (devc);
 
        /*
         * This is important! If it's not done, the IRQ probe in sb_dsp_init
         * may fail.
         */
        return ess_set_irq_hw (devc);
}
 
static int ess_set_dma_hw(sb_devc * devc)
{
        unsigned char cfg, dma_bits = 0, dma16_bits;
        int dma;
 
#ifdef FKS_LOGGING
printk(KERN_INFO "ess_set_dma_hw: dma8=%d,dma16=%d,dup=%d\n"
, devc->dma8, devc->dma16, devc->duplex);
#endif
 
        /*
         * FKS: It seems as if this duplex flag isn't set yet. Check it.
         */
        dma = devc->dma8;
 
        if (dma > 3 || dma < 0 || dma == 2) {
                dma_bits = 0;
                printk(KERN_ERR "ESS1688: Invalid DMA8 %d\n", dma);
                return 0;
        } else {
                /* Extended mode DMA enable */
                cfg = 0x50;
 
                if (dma == 3) {
                        dma_bits = 3;
                } else {
                        dma_bits = dma + 1;
                }
        }
 
        if (!ess_write (devc, 0xb2, cfg | (dma_bits << 2))) {
                printk(KERN_ERR "ESS1688: Failed to write to DMA config register\n");
                return 0;
        }
 
        if (devc->duplex) {
                dma = devc->dma16;
                dma16_bits = 0;
 
                if (dma >= 0) {
                        switch (dma) {
                        case 0:
                                dma_bits = 0x04;
                                break;
                        case 1:
                                dma_bits = 0x05;
                                break;
                        case 3:
                                dma_bits = 0x06;
                                break;
                        case 5:
                                dma_bits   = 0x07;
                                dma16_bits = 0x20;
                                break;
                        default:
                                printk(KERN_ERR "ESS1887: Invalid DMA16 %d\n", dma);
                                return 0;
                        };
                        ess_chgmixer (devc, 0x78, 0x20, dma16_bits);
                        ess_chgmixer (devc, 0x7d, 0x07, dma_bits);
                }
        }
        return 1;
}
 
/*
 * This one is called from sb_dsp_init.
 *
 * Return values:
 *  0: Failed
 *  1: Succeeded or doesn't apply (not SUBMDL_ES1887)
 */
int ess_dsp_init (sb_devc *devc, struct address_info *hw_config)
{
        /*
         * Caller also checks this, but anyway
         */
        if (devc->model != MDL_ESS) {
                printk (KERN_INFO "ess_dsp_init for non ESS chip\n");
                return 1;
        }
        /*
         * This for ES1887 to run Full Duplex. Actually ES1888
         * is allowed to do so too. I have no idea yet if this
         * will work for ES1888 however.
         *
         * For SB16 having both dma8 and dma16 means enable
         * Full Duplex. Let's try this for ES1887 too
         *
         */
        if (devc->submodel == SUBMDL_ES1887) {
                if (hw_config->dma2 != -1) {
                        devc->dma16 = hw_config->dma2;
                }
                /*
                 * devc->duplex initialization is put here, cause
                 * ess_set_dma_hw needs it.
                 */
                if (devc->dma8 != devc->dma16 && devc->dma16 != -1) {
                        devc->duplex = 1;
                }
        }
        if (!ess_set_dma_hw (devc)) {
                free_irq(devc->irq, devc);
                return 0;
        }
        return 1;
}
 
/****************************************************************************
 *                                                                                                                                                      *
 *                                                                      ESS mixer                                                               *
 *                                                                                                                                                      *
 ****************************************************************************/
 
#define ES688_RECORDING_DEVICES \
                        ( SOUND_MASK_LINE       | SOUND_MASK_MIC        | SOUND_MASK_CD         )
#define ES688_MIXER_DEVICES             \
                        ( SOUND_MASK_SYNTH      | SOUND_MASK_PCM        | SOUND_MASK_LINE       \
                        | SOUND_MASK_MIC        | SOUND_MASK_CD         | SOUND_MASK_VOLUME     \
                        | SOUND_MASK_LINE2      | SOUND_MASK_SPEAKER                                    )
 
#define ES1688_RECORDING_DEVICES        \
                        ( ES688_RECORDING_DEVICES                                       )
#define ES1688_MIXER_DEVICES            \
                        ( ES688_MIXER_DEVICES | SOUND_MASK_RECLEV       )
 
#define ES1887_RECORDING_DEVICES        \
                        ( ES1688_RECORDING_DEVICES | SOUND_MASK_LINE2 | SOUND_MASK_SYNTH)
#define ES1887_MIXER_DEVICES            \
                        ( ES1688_MIXER_DEVICES                                                                                  )
 
/*
 * Mixer registers of ES1887
 *
 * These registers specifically take care of recording levels. To make the
 * mapping from playback devices to recording devices every recording
 * devices = playback device + ES_REC_MIXER_RECDIFF
 */
#define ES_REC_MIXER_RECBASE    (SOUND_MIXER_LINE3 + 1)
#define ES_REC_MIXER_RECDIFF    (ES_REC_MIXER_RECBASE - SOUND_MIXER_SYNTH)
 
#define ES_REC_MIXER_RECSYNTH   (SOUND_MIXER_SYNTH       + ES_REC_MIXER_RECDIFF)
#define ES_REC_MIXER_RECPCM             (SOUND_MIXER_PCM         + ES_REC_MIXER_RECDIFF)
#define ES_REC_MIXER_RECSPEAKER (SOUND_MIXER_SPEAKER + ES_REC_MIXER_RECDIFF)
#define ES_REC_MIXER_RECLINE    (SOUND_MIXER_LINE        + ES_REC_MIXER_RECDIFF)
#define ES_REC_MIXER_RECMIC             (SOUND_MIXER_MIC         + ES_REC_MIXER_RECDIFF)
#define ES_REC_MIXER_RECCD              (SOUND_MIXER_CD          + ES_REC_MIXER_RECDIFF)
#define ES_REC_MIXER_RECIMIX    (SOUND_MIXER_IMIX        + ES_REC_MIXER_RECDIFF)
#define ES_REC_MIXER_RECALTPCM  (SOUND_MIXER_ALTPCM      + ES_REC_MIXER_RECDIFF)
#define ES_REC_MIXER_RECRECLEV  (SOUND_MIXER_RECLEV      + ES_REC_MIXER_RECDIFF)
#define ES_REC_MIXER_RECIGAIN   (SOUND_MIXER_IGAIN       + ES_REC_MIXER_RECDIFF)
#define ES_REC_MIXER_RECOGAIN   (SOUND_MIXER_OGAIN       + ES_REC_MIXER_RECDIFF)
#define ES_REC_MIXER_RECLINE1   (SOUND_MIXER_LINE1       + ES_REC_MIXER_RECDIFF)
#define ES_REC_MIXER_RECLINE2   (SOUND_MIXER_LINE2       + ES_REC_MIXER_RECDIFF)
#define ES_REC_MIXER_RECLINE3   (SOUND_MIXER_LINE3       + ES_REC_MIXER_RECDIFF)
 
static mixer_tab es688_mix = {
MIX_ENT(SOUND_MIXER_VOLUME,                     0x32, 7, 4, 0x32, 3, 4),
MIX_ENT(SOUND_MIXER_BASS,                       0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_TREBLE,                     0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_SYNTH,                      0x36, 7, 4, 0x36, 3, 4),
MIX_ENT(SOUND_MIXER_PCM,                        0x14, 7, 4, 0x14, 3, 4),
MIX_ENT(SOUND_MIXER_SPEAKER,            0x3c, 2, 3, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_LINE,                       0x3e, 7, 4, 0x3e, 3, 4),
MIX_ENT(SOUND_MIXER_MIC,                        0x1a, 7, 4, 0x1a, 3, 4),
MIX_ENT(SOUND_MIXER_CD,                         0x38, 7, 4, 0x38, 3, 4),
MIX_ENT(SOUND_MIXER_IMIX,                       0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_ALTPCM,                     0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_RECLEV,                     0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_IGAIN,                      0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_OGAIN,                      0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_LINE1,                      0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_LINE2,                      0x3a, 7, 4, 0x3a, 3, 4),
MIX_ENT(SOUND_MIXER_LINE3,                      0x00, 0, 0, 0x00, 0, 0)
};
 
/*
 * The ES1688 specifics... hopefully correct...
 * - 6 bit master volume
 *   I was wrong, ES1888 docs say ES1688 didn't have it.
 * - RECLEV control
 * These may apply to ES688 too. I have no idea.
 */
static mixer_tab es1688_mix = {
MIX_ENT(SOUND_MIXER_VOLUME,                     0x32, 7, 4, 0x32, 3, 4),
MIX_ENT(SOUND_MIXER_BASS,                       0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_TREBLE,                     0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_SYNTH,                      0x36, 7, 4, 0x36, 3, 4),
MIX_ENT(SOUND_MIXER_PCM,                        0x14, 7, 4, 0x14, 3, 4),
MIX_ENT(SOUND_MIXER_SPEAKER,            0x3c, 2, 3, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_LINE,                       0x3e, 7, 4, 0x3e, 3, 4),
MIX_ENT(SOUND_MIXER_MIC,                        0x1a, 7, 4, 0x1a, 3, 4),
MIX_ENT(SOUND_MIXER_CD,                         0x38, 7, 4, 0x38, 3, 4),
MIX_ENT(SOUND_MIXER_IMIX,                       0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_ALTPCM,                     0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_RECLEV,                     0xb4, 7, 4, 0xb4, 3, 4),
MIX_ENT(SOUND_MIXER_IGAIN,                      0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_OGAIN,                      0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_LINE1,                      0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_LINE2,                      0x3a, 7, 4, 0x3a, 3, 4),
MIX_ENT(SOUND_MIXER_LINE3,                      0x00, 0, 0, 0x00, 0, 0)
};
 
static mixer_tab es1688later_mix = {
MIX_ENT(SOUND_MIXER_VOLUME,                     0x60, 5, 6, 0x62, 5, 6),
MIX_ENT(SOUND_MIXER_BASS,                       0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_TREBLE,                     0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_SYNTH,                      0x36, 7, 4, 0x36, 3, 4),
MIX_ENT(SOUND_MIXER_PCM,                        0x14, 7, 4, 0x14, 3, 4),
MIX_ENT(SOUND_MIXER_SPEAKER,            0x3c, 2, 3, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_LINE,                       0x3e, 7, 4, 0x3e, 3, 4),
MIX_ENT(SOUND_MIXER_MIC,                        0x1a, 7, 4, 0x1a, 3, 4),
MIX_ENT(SOUND_MIXER_CD,                         0x38, 7, 4, 0x38, 3, 4),
MIX_ENT(SOUND_MIXER_IMIX,                       0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_ALTPCM,                     0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_RECLEV,                     0xb4, 7, 4, 0xb4, 3, 4),
MIX_ENT(SOUND_MIXER_IGAIN,                      0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_OGAIN,                      0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_LINE1,                      0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_LINE2,                      0x3a, 7, 4, 0x3a, 3, 4),
MIX_ENT(SOUND_MIXER_LINE3,                      0x00, 0, 0, 0x00, 0, 0)
};
 
/*
 * This one is for all ESS chips with a record mixer.
 * It's not used (yet) however
 */
static mixer_tab es_rec_mix = {
MIX_ENT(SOUND_MIXER_VOLUME,                     0x60, 5, 6, 0x62, 5, 6),
MIX_ENT(SOUND_MIXER_BASS,                       0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_TREBLE,                     0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_SYNTH,                      0x36, 7, 4, 0x36, 3, 4),
MIX_ENT(SOUND_MIXER_PCM,                        0x14, 7, 4, 0x14, 3, 4),
MIX_ENT(SOUND_MIXER_SPEAKER,            0x3c, 2, 3, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_LINE,                       0x3e, 7, 4, 0x3e, 3, 4),
MIX_ENT(SOUND_MIXER_MIC,                        0x1a, 7, 4, 0x1a, 3, 4),
MIX_ENT(SOUND_MIXER_CD,                         0x38, 7, 4, 0x38, 3, 4),
MIX_ENT(SOUND_MIXER_IMIX,                       0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_ALTPCM,                     0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_RECLEV,                     0xb4, 7, 4, 0xb4, 3, 4),
MIX_ENT(SOUND_MIXER_IGAIN,                      0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_OGAIN,                      0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_LINE1,                      0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_LINE2,                      0x3a, 7, 4, 0x3a, 3, 4),
MIX_ENT(SOUND_MIXER_LINE3,                      0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(ES_REC_MIXER_RECSYNTH,          0x6b, 7, 4, 0x6b, 3, 4),
MIX_ENT(ES_REC_MIXER_RECPCM,            0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(ES_REC_MIXER_RECSPEAKER,        0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(ES_REC_MIXER_RECLINE,           0x6e, 7, 4, 0x6e, 3, 4),
MIX_ENT(ES_REC_MIXER_RECMIC,            0x68, 7, 4, 0x68, 3, 4),
MIX_ENT(ES_REC_MIXER_RECCD,                     0x6a, 7, 4, 0x6a, 3, 4),
MIX_ENT(ES_REC_MIXER_RECIMIX,           0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(ES_REC_MIXER_RECALTPCM,         0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(ES_REC_MIXER_RECRECLEV,         0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(ES_REC_MIXER_RECIGAIN,          0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(ES_REC_MIXER_RECOGAIN,          0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(ES_REC_MIXER_RECLINE1,          0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(ES_REC_MIXER_RECLINE2,          0x6c, 7, 4, 0x6c, 3, 4),
MIX_ENT(ES_REC_MIXER_RECLINE3,          0x00, 0, 0, 0x00, 0, 0)
};
 
/*
 * This one is for ES1887. It's little different from es_rec_mix: it
 * has 0x7c for PCM playback level. This is because ES1887 uses
 * Audio 2 for playback.
 */
static mixer_tab es1887_mix = {
MIX_ENT(SOUND_MIXER_VOLUME,                     0x60, 5, 6, 0x62, 5, 6),
MIX_ENT(SOUND_MIXER_BASS,                       0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_TREBLE,                     0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_SYNTH,                      0x36, 7, 4, 0x36, 3, 4),
MIX_ENT(SOUND_MIXER_PCM,                        0x7c, 7, 4, 0x7c, 3, 4),
MIX_ENT(SOUND_MIXER_SPEAKER,            0x3c, 2, 3, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_LINE,                       0x3e, 7, 4, 0x3e, 3, 4),
MIX_ENT(SOUND_MIXER_MIC,                        0x1a, 7, 4, 0x1a, 3, 4),
MIX_ENT(SOUND_MIXER_CD,                         0x38, 7, 4, 0x38, 3, 4),
MIX_ENT(SOUND_MIXER_IMIX,                       0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_ALTPCM,                     0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_RECLEV,                     0xb4, 7, 4, 0xb4, 3, 4),
MIX_ENT(SOUND_MIXER_IGAIN,                      0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_OGAIN,                      0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_LINE1,                      0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(SOUND_MIXER_LINE2,                      0x3a, 7, 4, 0x3a, 3, 4),
MIX_ENT(SOUND_MIXER_LINE3,                      0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(ES_REC_MIXER_RECSYNTH,          0x6b, 7, 4, 0x6b, 3, 4),
MIX_ENT(ES_REC_MIXER_RECPCM,            0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(ES_REC_MIXER_RECSPEAKER,        0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(ES_REC_MIXER_RECLINE,           0x6e, 7, 4, 0x6e, 3, 4),
MIX_ENT(ES_REC_MIXER_RECMIC,            0x68, 7, 4, 0x68, 3, 4),
MIX_ENT(ES_REC_MIXER_RECCD,                     0x6a, 7, 4, 0x6a, 3, 4),
MIX_ENT(ES_REC_MIXER_RECIMIX,           0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(ES_REC_MIXER_RECALTPCM,         0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(ES_REC_MIXER_RECRECLEV,         0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(ES_REC_MIXER_RECIGAIN,          0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(ES_REC_MIXER_RECOGAIN,          0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(ES_REC_MIXER_RECLINE1,          0x00, 0, 0, 0x00, 0, 0),
MIX_ENT(ES_REC_MIXER_RECLINE2,          0x6c, 7, 4, 0x6c, 3, 4),
MIX_ENT(ES_REC_MIXER_RECLINE3,          0x00, 0, 0, 0x00, 0, 0)
};
 
static int ess_has_rec_mixer (int submodel)
{
        switch (submodel) {
        case SUBMDL_ES1887:
                return 1;
        default:
                return 0;
        };
};
 
#ifdef FKS_LOGGING
static int ess_mixer_mon_regs[]
        = { 0x70, 0x71, 0x72, 0x74, 0x76, 0x78, 0x7a, 0x7c, 0x7d, 0x7f
          , 0xa1, 0xa2, 0xa4, 0xa5, 0xa8, 0xa9
          , 0xb1, 0xb2, 0xb4, 0xb5, 0xb6, 0xb7, 0xb9
          , 0x00};
 
static void ess_show_mixerregs (sb_devc *devc)
{
        int *mp = ess_mixer_mon_regs;
 
return;
 
        while (*mp != 0) {
                printk (KERN_INFO "res (%x)=%x\n", *mp, (int)(ess_getmixer (devc, *mp)));
                mp++;
        }
}
#endif
 
void ess_setmixer (sb_devc * devc, unsigned int port, unsigned int value)
{
        unsigned long flags;
 
#ifdef FKS_LOGGING
printk(KERN_INFO "FKS: write mixer %x: %x\n", port, value);
#endif
 
        spin_lock_irqsave(&devc->lock, flags);
        if (port >= 0xa0) {
                ess_write (devc, port, value);
        } else {
                outb(((unsigned char) (port & 0xff)), MIXER_ADDR);
 
                udelay(20);
                outb(((unsigned char) (value & 0xff)), MIXER_DATA);
                udelay(20);
        };
        spin_unlock_irqrestore(&devc->lock, flags);
}
 
unsigned int ess_getmixer (sb_devc * devc, unsigned int port)
{
        unsigned int val;
        unsigned long flags;
 
        spin_lock_irqsave(&devc->lock, flags);
 
        if (port >= 0xa0) {
                val = ess_read (devc, port);
        } else {
                outb(((unsigned char) (port & 0xff)), MIXER_ADDR);
 
                udelay(20);
                val = inb(MIXER_DATA);
                udelay(20);
        }
        spin_unlock_irqrestore(&devc->lock, flags);
 
        return val;
}
 
static void ess_chgmixer
        (sb_devc * devc, unsigned int reg, unsigned int mask, unsigned int val)
{
        int value;
 
        value = ess_getmixer (devc, reg);
        value = (value & ~mask) | (val & mask);
        ess_setmixer (devc, reg, value);
}
 
/*
 * ess_mixer_init must be called from sb_mixer_init
 */
void ess_mixer_init (sb_devc * devc)
{
        devc->mixer_caps = SOUND_CAP_EXCL_INPUT;
 
        /*
        * Take care of ES1887 specifics...
        */
        switch (devc->submodel) {
        case SUBMDL_ES1887:
                devc->supported_devices         = ES1887_MIXER_DEVICES;
                devc->supported_rec_devices     = ES1887_RECORDING_DEVICES;
#ifdef FKS_LOGGING
printk (KERN_INFO "FKS: ess_mixer_init dup = %d\n", devc->duplex);
#endif
                if (devc->duplex) {
                        devc->iomap                             = &es1887_mix;
                } else {
                        devc->iomap                             = &es_rec_mix;
                }
                break;
        default:
                if (devc->submodel < 8) {
                        devc->supported_devices         = ES688_MIXER_DEVICES;
                        devc->supported_rec_devices     = ES688_RECORDING_DEVICES;
                        devc->iomap                                     = &es688_mix;
                } else {
                        /*
                         * es1688 has 4 bits master vol.
                         * later chips have 6 bits (?)
                         */
                        devc->supported_devices         = ES1688_MIXER_DEVICES;
                        devc->supported_rec_devices     = ES1688_RECORDING_DEVICES;
                        if (devc->submodel < 0x10) {
                                devc->iomap                             = &es1688_mix;
                        } else {
                                devc->iomap                             = &es1688later_mix;
                        }
                }
        }
}
 
/*
 * Changing playback levels at an ESS chip with record mixer means having to
 * take care of recording levels of recorded inputs (devc->recmask) too!
 */
int ess_mixer_set(sb_devc *devc, int dev, int left, int right)
{
        if (ess_has_rec_mixer (devc->submodel) && (devc->recmask & (1 << dev))) {
                sb_common_mixer_set (devc, dev + ES_REC_MIXER_RECDIFF, left, right);
        }
        return sb_common_mixer_set (devc, dev, left, right);
}
 
/*
 * After a sb_dsp_reset extended register 0xb4 (RECLEV) is reset too. After
 * sb_dsp_reset RECLEV has to be restored. This is where ess_mixer_reload
 * helps.
 */
void ess_mixer_reload (sb_devc *devc, int dev)
{
        int left, right, value;
 
        value = devc->levels[dev];
        left  = value & 0x000000ff;
        right = (value & 0x0000ff00) >> 8;
 
        sb_common_mixer_set(devc, dev, left, right);
}
 
int es_rec_set_recmask(sb_devc * devc, int mask)
{
        int i, i_mask, cur_mask, diff_mask;
        int value, left, right;
 
#ifdef FKS_LOGGING
printk (KERN_INFO "FKS: es_rec_set_recmask mask = %x\n", mask);
#endif
        /*
         * Changing the recmask on an ESS chip with recording mixer means:
         * (1) Find the differences
         * (2) For "turned-on"  inputs: make the recording level the playback level
         * (3) For "turned-off" inputs: make the recording level zero
         */
        cur_mask  = devc->recmask;
        diff_mask = (cur_mask ^ mask);
 
        for (i = 0; i < 32; i++) {
                i_mask = (1 << i);
                if (diff_mask & i_mask) {       /* Difference? (1)  */
                        if (mask & i_mask) {    /* Turn it on  (2)  */
                                value = devc->levels[i];
                                left  = value & 0x000000ff;
                                right = (value & 0x0000ff00) >> 8;
                        } else {                                /* Turn it off (3)  */
                                left  = 0;
                                left  = 0;
                                right = 0;
                        }
                        sb_common_mixer_set(devc, i + ES_REC_MIXER_RECDIFF, left, right);
                }
        }
        return mask;
}
 
int ess_set_recmask(sb_devc * devc, int *mask)
{
        /* This applies to ESS chips with record mixers only! */
 
        if (ess_has_rec_mixer (devc->submodel)) {
                *mask   = es_rec_set_recmask (devc, *mask);
                return 1;                                                                       /* Applied              */
        } else {
                return 0;                                                                        /* Not applied  */
        }
}
 
/*
 * ess_mixer_reset must be called from sb_mixer_reset
 */
int ess_mixer_reset (sb_devc * devc)
{
        /*
         * Separate actions for ESS chips with a record mixer:
         */
        if (ess_has_rec_mixer (devc->submodel)) {
                switch (devc->submodel) {
                case SUBMDL_ES1887:
                        /*
                         * Separate actions for ES1887:
                         * Change registers 7a and 1c to make the record mixer the
                         * actual recording source.
                         */
                        ess_chgmixer(devc, 0x7a, 0x18, 0x08);
                        ess_chgmixer(devc, 0x1c, 0x07, 0x07);
                        break;
                };
                /*
                 * Call set_recmask for proper initialization
                 */
                devc->recmask = devc->supported_rec_devices;
                es_rec_set_recmask(devc, 0);
                devc->recmask = 0;
 
                return 1;       /* We took care of recmask.                             */
        } else {
                return 0;        /* We didn't take care; caller do it    */
        }
}
 
/****************************************************************************
 *                                                                                                                                                      *
 *                                                              ESS midi                                                                        *
 *                                                                                                                                                      *
 ****************************************************************************/
 
/*
 * FKS: IRQ may be shared. Hm. And if so? Then What?
 */
int ess_midi_init(sb_devc * devc, struct address_info *hw_config)
{
        unsigned char   cfg, tmp;
 
        cfg = ess_getmixer (devc, 0x40) & 0x03;
 
        if (devc->submodel < 8) {
                ess_setmixer (devc, 0x40, cfg | 0x03);  /* Enable OPL3 & joystick */
                return 0;                                         /* ES688 doesn't support MPU401 mode */
        }
        tmp = (hw_config->io_base & 0x0f0) >> 4;
 
        if (tmp > 3) {
                ess_setmixer (devc, 0x40, cfg);
                return 0;
        }
        cfg |= tmp << 3;
 
        tmp = 1;                /* MPU enabled without interrupts */
 
        /* May be shared: if so the value is -ve */
 
        switch (abs(hw_config->irq)) {
                case 9:
                        tmp = 0x4;
                        break;
                case 5:
                        tmp = 0x5;
                        break;
                case 7:
                        tmp = 0x6;
                        break;
                case 10:
                        tmp = 0x7;
                        break;
                default:
                        return 0;
        }
 
        cfg |= tmp << 5;
        ess_setmixer (devc, 0x40, cfg | 0x03);
 
        return 1;
}
 
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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [sound/] [sb_ess.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1275	phoenix	`#undef FKS_LOGGING`
2			`#undef FKS_TEST`
3
4			`/*`
5			`* tabs should be 4 spaces, in vi(m): set tabstop=4`
6			`*`
7			`* TODO: consistency speed calculations!!`
8			`* cleanup!`
9			`* ????: Did I break MIDI support?`
10			`*`
11			`* History:`
12			`*`
13			`* Rolf Fokkens (Dec 20 1998): ES188x recording level support on a per`
14			`* fokkensr@vertis.nl input basis.`
15			`* (Dec 24 1998): Recognition of ES1788, ES1887, ES1888,`
16			`* ES1868, ES1869 and ES1878. Could be used for`
17			`* specific handling in the future. All except`
18			`* ES1887 and ES1888 and ES688 are handled like`
19			`* ES1688.`
20			`* (Dec 27 1998): RECLEV for all (?) ES1688+ chips. ES188x now`
21			`* have the "Dec 20" support + RECLEV`
22			`* (Jan 2 1999): Preparation for Full Duplex. This means`
23			`* Audio 2 is now used for playback when dma16`
24			`* is specified. The next step would be to use`
25			`* Audio 1 and Audio 2 at the same time.`
26			`* (Jan 9 1999): Put all ESS stuff into sb_ess.[ch], this`
27			`* includes both the ESS stuff that has been in`
28			`* sb_*[ch] before I touched it and the ESS support`
29			`* I added later`
30			`* (Jan 23 1999): Full Duplex seems to work. I wrote a small`
31			`* test proggy which works OK. Haven't found`
32			`* any applications to test it though. So why did`
33			`* I bother to create it anyway?? :) Just for`
34			`* fun.`
35			`* (May 2 1999): I tried to be too smart by "introducing"`
36			`* ess_calc_best_speed (). The idea was that two`
37			`* dividers could be used to setup a samplerate,`
38			`* ess_calc_best_speed () would choose the best.`
39			`* This works for playback, but results in`
40			`* recording problems for high samplerates. I`