[ALSA] Changed Jaroslav Kysela's e-mail from perex@suse.cz to perex@perex.cz

[mirror_ubuntu-jammy-kernel.git] / sound / isa / ad1848 / ad1848_lib.c

/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *  Routines for control of AD1848/AD1847/CS4248
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#define SNDRV_MAIN_OBJECT_FILE
#include <sound/driver.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <sound/core.h>
#include <sound/ad1848.h>
#include <sound/control.h>
#include <sound/tlv.h>
#include <sound/pcm_params.h>

#include <asm/io.h>
#include <asm/dma.h>

MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("Routines for control of AD1848/AD1847/CS4248");
MODULE_LICENSE("GPL");

#if 0
#define SNDRV_DEBUG_MCE
#endif

/*
 *  Some variables
 */

static unsigned char freq_bits[14] = {
        /* 5510 */      0x00 | AD1848_XTAL2,
        /* 6620 */      0x0E | AD1848_XTAL2,
        /* 8000 */      0x00 | AD1848_XTAL1,
        /* 9600 */      0x0E | AD1848_XTAL1,
        /* 11025 */     0x02 | AD1848_XTAL2,
        /* 16000 */     0x02 | AD1848_XTAL1,
        /* 18900 */     0x04 | AD1848_XTAL2,
        /* 22050 */     0x06 | AD1848_XTAL2,
        /* 27042 */     0x04 | AD1848_XTAL1,
        /* 32000 */     0x06 | AD1848_XTAL1,
        /* 33075 */     0x0C | AD1848_XTAL2,
        /* 37800 */     0x08 | AD1848_XTAL2,
        /* 44100 */     0x0A | AD1848_XTAL2,
        /* 48000 */     0x0C | AD1848_XTAL1
};

static unsigned int rates[14] = {
        5510, 6620, 8000, 9600, 11025, 16000, 18900, 22050,
        27042, 32000, 33075, 37800, 44100, 48000
};

static struct snd_pcm_hw_constraint_list hw_constraints_rates = {
        .count = ARRAY_SIZE(rates),
        .list = rates,
        .mask = 0,
};

static unsigned char snd_ad1848_original_image[16] =
{
        0x00,                   /* 00 - lic */
        0x00,                   /* 01 - ric */
        0x9f,                   /* 02 - la1ic */
        0x9f,                   /* 03 - ra1ic */
        0x9f,                   /* 04 - la2ic */
        0x9f,                   /* 05 - ra2ic */
        0xbf,                   /* 06 - loc */
        0xbf,                   /* 07 - roc */
        0x20,                   /* 08 - dfr */
        AD1848_AUTOCALIB,       /* 09 - ic */
        0x00,                   /* 0a - pc */
        0x00,                   /* 0b - ti */
        0x00,                   /* 0c - mi */
        0x00,                   /* 0d - lbc */
        0x00,                   /* 0e - dru */
        0x00,                   /* 0f - drl */
};

/*
 *  Basic I/O functions
 */

static void snd_ad1848_wait(struct snd_ad1848 *chip)
{
        int timeout;

        for (timeout = 250; timeout > 0; timeout--) {
                if ((inb(AD1848P(chip, REGSEL)) & AD1848_INIT) == 0)
                        break;
                udelay(100);
        }
}

void snd_ad1848_out(struct snd_ad1848 *chip,
                           unsigned char reg,
                           unsigned char value)
{
        snd_ad1848_wait(chip);
#ifdef CONFIG_SND_DEBUG
        if (inb(AD1848P(chip, REGSEL)) & AD1848_INIT)
                snd_printk(KERN_WARNING "auto calibration time out - "
                           "reg = 0x%x, value = 0x%x\n", reg, value);
#endif
        outb(chip->mce_bit | reg, AD1848P(chip, REGSEL));
        outb(chip->image[reg] = value, AD1848P(chip, REG));
        mb();
        snd_printdd("codec out - reg 0x%x = 0x%x\n",
                        chip->mce_bit | reg, value);
}

EXPORT_SYMBOL(snd_ad1848_out);

static void snd_ad1848_dout(struct snd_ad1848 *chip,
                            unsigned char reg, unsigned char value)
{
        snd_ad1848_wait(chip);
        outb(chip->mce_bit | reg, AD1848P(chip, REGSEL));
        outb(value, AD1848P(chip, REG));
        mb();
}

static unsigned char snd_ad1848_in(struct snd_ad1848 *chip, unsigned char reg)
{
        snd_ad1848_wait(chip);
#ifdef CONFIG_SND_DEBUG
        if (inb(AD1848P(chip, REGSEL)) & AD1848_INIT)
                snd_printk(KERN_WARNING "auto calibration time out - "
                           "reg = 0x%x\n", reg);
#endif
        outb(chip->mce_bit | reg, AD1848P(chip, REGSEL));
        mb();
        return inb(AD1848P(chip, REG));
}

#if 0

static void snd_ad1848_debug(struct snd_ad1848 *chip)
{
        printk("AD1848 REGS:      INDEX = 0x%02x  ", inb(AD1848P(chip, REGSEL)));
        printk("                 STATUS = 0x%02x\n", inb(AD1848P(chip, STATUS)));
        printk("  0x00: left input      = 0x%02x  ", snd_ad1848_in(chip, 0x00));
        printk("  0x08: playback format = 0x%02x\n", snd_ad1848_in(chip, 0x08));
        printk("  0x01: right input     = 0x%02x  ", snd_ad1848_in(chip, 0x01));
        printk("  0x09: iface (CFIG 1)  = 0x%02x\n", snd_ad1848_in(chip, 0x09));
        printk("  0x02: AUXA left       = 0x%02x  ", snd_ad1848_in(chip, 0x02));
        printk("  0x0a: pin control     = 0x%02x\n", snd_ad1848_in(chip, 0x0a));
        printk("  0x03: AUXA right      = 0x%02x  ", snd_ad1848_in(chip, 0x03));
        printk("  0x0b: init & status   = 0x%02x\n", snd_ad1848_in(chip, 0x0b));
        printk("  0x04: AUXB left       = 0x%02x  ", snd_ad1848_in(chip, 0x04));
        printk("  0x0c: revision & mode = 0x%02x\n", snd_ad1848_in(chip, 0x0c));
        printk("  0x05: AUXB right      = 0x%02x  ", snd_ad1848_in(chip, 0x05));
        printk("  0x0d: loopback        = 0x%02x\n", snd_ad1848_in(chip, 0x0d));
        printk("  0x06: left output     = 0x%02x  ", snd_ad1848_in(chip, 0x06));
        printk("  0x0e: data upr count  = 0x%02x\n", snd_ad1848_in(chip, 0x0e));
        printk("  0x07: right output    = 0x%02x  ", snd_ad1848_in(chip, 0x07));
        printk("  0x0f: data lwr count  = 0x%02x\n", snd_ad1848_in(chip, 0x0f));
}

#endif

/*
 *  AD1848 detection / MCE routines
 */

static void snd_ad1848_mce_up(struct snd_ad1848 *chip)
{
        unsigned long flags;
        int timeout;

        snd_ad1848_wait(chip);
#ifdef CONFIG_SND_DEBUG
        if (inb(AD1848P(chip, REGSEL)) & AD1848_INIT)
                snd_printk(KERN_WARNING "mce_up - auto calibration time out (0)\n");
#endif
        spin_lock_irqsave(&chip->reg_lock, flags);
        chip->mce_bit |= AD1848_MCE;
        timeout = inb(AD1848P(chip, REGSEL));
        if (timeout == 0x80)
                snd_printk(KERN_WARNING "mce_up [0x%lx]: serious init problem - codec still busy\n", chip->port);
        if (!(timeout & AD1848_MCE))
                outb(chip->mce_bit | (timeout & 0x1f), AD1848P(chip, REGSEL));
        spin_unlock_irqrestore(&chip->reg_lock, flags);
}

static void snd_ad1848_mce_down(struct snd_ad1848 *chip)
{
        unsigned long flags, timeout;
        int reg;

        spin_lock_irqsave(&chip->reg_lock, flags);
        for (timeout = 5; timeout > 0; timeout--)
                inb(AD1848P(chip, REGSEL));
        /* end of cleanup sequence */
        for (timeout = 12000; timeout > 0 && (inb(AD1848P(chip, REGSEL)) & AD1848_INIT); timeout--)
                udelay(100);

        snd_printdd("(1) timeout = %d\n", timeout);

#ifdef CONFIG_SND_DEBUG
        if (inb(AD1848P(chip, REGSEL)) & AD1848_INIT)
                snd_printk(KERN_WARNING "mce_down [0x%lx] - auto calibration time out (0)\n", AD1848P(chip, REGSEL));
#endif

        chip->mce_bit &= ~AD1848_MCE;
        reg = inb(AD1848P(chip, REGSEL));
        outb(chip->mce_bit | (reg & 0x1f), AD1848P(chip, REGSEL));
        if (reg == 0x80)
                snd_printk(KERN_WARNING "mce_down [0x%lx]: serious init problem - codec still busy\n", chip->port);
        if ((reg & AD1848_MCE) == 0) {
                spin_unlock_irqrestore(&chip->reg_lock, flags);
                return;
        }

        /*
         * Wait for auto-calibration (AC) process to finish, i.e. ACI to go low.
         * It may take up to 5 sample periods (at most 907 us @ 5.5125 kHz) for
         * the process to _start_, so it is important to wait at least that long
         * before checking.  Otherwise we might think AC has finished when it
         * has in fact not begun.  It could take 128 (no AC) or 384 (AC) cycles
         * for ACI to drop.  This gives a wait of at most 70 ms with a more
         * typical value of 3-9 ms.
         */
        timeout = jiffies + msecs_to_jiffies(250);
        do {
                spin_unlock_irqrestore(&chip->reg_lock, flags);
                msleep(1);
                spin_lock_irqsave(&chip->reg_lock, flags);
                reg = snd_ad1848_in(chip, AD1848_TEST_INIT) &
                      AD1848_CALIB_IN_PROGRESS;
        } while (reg && time_before(jiffies, timeout));
        spin_unlock_irqrestore(&chip->reg_lock, flags);
        if (reg)
                snd_printk(KERN_ERR
                           "mce_down - auto calibration time out (2)\n");

        snd_printdd("(4) jiffies = %lu\n", jiffies);
        snd_printd("mce_down - exit = 0x%x\n", inb(AD1848P(chip, REGSEL)));
}

static unsigned int snd_ad1848_get_count(unsigned char format,
                                         unsigned int size)
{
        switch (format & 0xe0) {
        case AD1848_LINEAR_16:
                size >>= 1;
                break;
        }
        if (format & AD1848_STEREO)
                size >>= 1;
        return size;
}

static int snd_ad1848_trigger(struct snd_ad1848 *chip, unsigned char what,
                              int channel, int cmd)
{
        int result = 0;

#if 0
        printk("codec trigger!!! - what = %i, enable = %i, status = 0x%x\n", what, enable, inb(AD1848P(card, STATUS)));
#endif
        spin_lock(&chip->reg_lock);
        if (cmd == SNDRV_PCM_TRIGGER_START) {
                if (chip->image[AD1848_IFACE_CTRL] & what) {
                        spin_unlock(&chip->reg_lock);
                        return 0;
                }
                snd_ad1848_out(chip, AD1848_IFACE_CTRL, chip->image[AD1848_IFACE_CTRL] |= what);
                chip->mode |= AD1848_MODE_RUNNING;
        } else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
                if (!(chip->image[AD1848_IFACE_CTRL] & what)) {
                        spin_unlock(&chip->reg_lock);
                        return 0;
                }
                snd_ad1848_out(chip, AD1848_IFACE_CTRL, chip->image[AD1848_IFACE_CTRL] &= ~what);
                chip->mode &= ~AD1848_MODE_RUNNING;
        } else {
                result = -EINVAL;
        }
        spin_unlock(&chip->reg_lock);
        return result;
}

/*
 *  CODEC I/O
 */

static unsigned char snd_ad1848_get_rate(unsigned int rate)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(rates); i++)
                if (rate == rates[i])
                        return freq_bits[i];
        snd_BUG();
        return freq_bits[ARRAY_SIZE(rates) - 1];
}

static int snd_ad1848_ioctl(struct snd_pcm_substream *substream,
                            unsigned int cmd, void *arg)
{
        return snd_pcm_lib_ioctl(substream, cmd, arg);
}

static unsigned char snd_ad1848_get_format(int format, int channels)
{
        unsigned char rformat;

        rformat = AD1848_LINEAR_8;
        switch (format) {
        case SNDRV_PCM_FORMAT_A_LAW:    rformat = AD1848_ALAW_8; break;
        case SNDRV_PCM_FORMAT_MU_LAW:   rformat = AD1848_ULAW_8; break;
        case SNDRV_PCM_FORMAT_S16_LE:   rformat = AD1848_LINEAR_16; break;
        }
        if (channels > 1)
                rformat |= AD1848_STEREO;
#if 0
        snd_printk("get_format: 0x%x (mode=0x%x)\n", format, mode);
#endif
        return rformat;
}

static void snd_ad1848_calibrate_mute(struct snd_ad1848 *chip, int mute)
{
        unsigned long flags;
        
        mute = mute ? 1 : 0;
        spin_lock_irqsave(&chip->reg_lock, flags);
        if (chip->calibrate_mute == mute) {
                spin_unlock_irqrestore(&chip->reg_lock, flags);
                return;
        }
        if (!mute) {
                snd_ad1848_dout(chip, AD1848_LEFT_INPUT, chip->image[AD1848_LEFT_INPUT]);
                snd_ad1848_dout(chip, AD1848_RIGHT_INPUT, chip->image[AD1848_RIGHT_INPUT]);
        }
        snd_ad1848_dout(chip, AD1848_AUX1_LEFT_INPUT, mute ? 0x80 : chip->image[AD1848_AUX1_LEFT_INPUT]);
        snd_ad1848_dout(chip, AD1848_AUX1_RIGHT_INPUT, mute ? 0x80 : chip->image[AD1848_AUX1_RIGHT_INPUT]);
        snd_ad1848_dout(chip, AD1848_AUX2_LEFT_INPUT, mute ? 0x80 : chip->image[AD1848_AUX2_LEFT_INPUT]);
        snd_ad1848_dout(chip, AD1848_AUX2_RIGHT_INPUT, mute ? 0x80 : chip->image[AD1848_AUX2_RIGHT_INPUT]);
        snd_ad1848_dout(chip, AD1848_LEFT_OUTPUT, mute ? 0x80 : chip->image[AD1848_LEFT_OUTPUT]);
        snd_ad1848_dout(chip, AD1848_RIGHT_OUTPUT, mute ? 0x80 : chip->image[AD1848_RIGHT_OUTPUT]);
        chip->calibrate_mute = mute;
        spin_unlock_irqrestore(&chip->reg_lock, flags);
}

static void snd_ad1848_set_data_format(struct snd_ad1848 *chip, struct snd_pcm_hw_params *hw_params)
{
        if (hw_params == NULL) {
                chip->image[AD1848_DATA_FORMAT] = 0x20;
        } else {
                chip->image[AD1848_DATA_FORMAT] =
                    snd_ad1848_get_format(params_format(hw_params), params_channels(hw_params)) |
                    snd_ad1848_get_rate(params_rate(hw_params));
        }
        // snd_printk(">>> pmode = 0x%x, dfr = 0x%x\n", pstr->mode, chip->image[AD1848_DATA_FORMAT]);
}

static int snd_ad1848_open(struct snd_ad1848 *chip, unsigned int mode)
{
        unsigned long flags;

        mutex_lock(&chip->open_mutex);
        if (chip->mode & AD1848_MODE_OPEN) {
                mutex_unlock(&chip->open_mutex);
                return -EAGAIN;
        }
        snd_ad1848_mce_down(chip);

#ifdef SNDRV_DEBUG_MCE
        snd_printk("open: (1)\n");
#endif
        snd_ad1848_mce_up(chip);
        spin_lock_irqsave(&chip->reg_lock, flags);
        chip->image[AD1848_IFACE_CTRL] &= ~(AD1848_PLAYBACK_ENABLE | AD1848_PLAYBACK_PIO |
                             AD1848_CAPTURE_ENABLE | AD1848_CAPTURE_PIO |
                             AD1848_CALIB_MODE);
        chip->image[AD1848_IFACE_CTRL] |= AD1848_AUTOCALIB;
        snd_ad1848_out(chip, AD1848_IFACE_CTRL, chip->image[AD1848_IFACE_CTRL]);
        spin_unlock_irqrestore(&chip->reg_lock, flags);
        snd_ad1848_mce_down(chip);

#ifdef SNDRV_DEBUG_MCE
        snd_printk("open: (2)\n");
#endif

        snd_ad1848_set_data_format(chip, NULL);

        snd_ad1848_mce_up(chip);
        spin_lock_irqsave(&chip->reg_lock, flags);
        snd_ad1848_out(chip, AD1848_DATA_FORMAT, chip->image[AD1848_DATA_FORMAT]);
        spin_unlock_irqrestore(&chip->reg_lock, flags);
        snd_ad1848_mce_down(chip);

#ifdef SNDRV_DEBUG_MCE
        snd_printk("open: (3)\n");
#endif

        /* ok. now enable and ack CODEC IRQ */
        spin_lock_irqsave(&chip->reg_lock, flags);
        outb(0, AD1848P(chip, STATUS)); /* clear IRQ */
        outb(0, AD1848P(chip, STATUS)); /* clear IRQ */
        chip->image[AD1848_PIN_CTRL] |= AD1848_IRQ_ENABLE;
        snd_ad1848_out(chip, AD1848_PIN_CTRL, chip->image[AD1848_PIN_CTRL]);
        spin_unlock_irqrestore(&chip->reg_lock, flags);

        chip->mode = mode;
        mutex_unlock(&chip->open_mutex);

        return 0;
}

static void snd_ad1848_close(struct snd_ad1848 *chip)
{
        unsigned long flags;

        mutex_lock(&chip->open_mutex);
        if (!chip->mode) {
                mutex_unlock(&chip->open_mutex);
                return;
        }
        /* disable IRQ */
        spin_lock_irqsave(&chip->reg_lock, flags);
        outb(0, AD1848P(chip, STATUS)); /* clear IRQ */
        outb(0, AD1848P(chip, STATUS)); /* clear IRQ */
        chip->image[AD1848_PIN_CTRL] &= ~AD1848_IRQ_ENABLE;
        snd_ad1848_out(chip, AD1848_PIN_CTRL, chip->image[AD1848_PIN_CTRL]);
        spin_unlock_irqrestore(&chip->reg_lock, flags);

        /* now disable capture & playback */

        snd_ad1848_mce_up(chip);
        spin_lock_irqsave(&chip->reg_lock, flags);
        chip->image[AD1848_IFACE_CTRL] &= ~(AD1848_PLAYBACK_ENABLE | AD1848_PLAYBACK_PIO |
                             AD1848_CAPTURE_ENABLE | AD1848_CAPTURE_PIO);
        snd_ad1848_out(chip, AD1848_IFACE_CTRL, chip->image[AD1848_IFACE_CTRL]);
        spin_unlock_irqrestore(&chip->reg_lock, flags);
        snd_ad1848_mce_down(chip);

        /* clear IRQ again */
        spin_lock_irqsave(&chip->reg_lock, flags);
        outb(0, AD1848P(chip, STATUS)); /* clear IRQ */
        outb(0, AD1848P(chip, STATUS)); /* clear IRQ */
        spin_unlock_irqrestore(&chip->reg_lock, flags);

        chip->mode = 0;
        mutex_unlock(&chip->open_mutex);
}

/*
 *  ok.. exported functions..
 */

static int snd_ad1848_playback_trigger(struct snd_pcm_substream *substream,
                                       int cmd)
{
        struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
        return snd_ad1848_trigger(chip, AD1848_PLAYBACK_ENABLE, SNDRV_PCM_STREAM_PLAYBACK, cmd);
}

static int snd_ad1848_capture_trigger(struct snd_pcm_substream *substream,
                                      int cmd)
{
        struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
        return snd_ad1848_trigger(chip, AD1848_CAPTURE_ENABLE, SNDRV_PCM_STREAM_CAPTURE, cmd);
}

static int snd_ad1848_playback_hw_params(struct snd_pcm_substream *substream,
                                         struct snd_pcm_hw_params *hw_params)
{
        struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
        unsigned long flags;
        int err;

        if ((err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0)
                return err;
        snd_ad1848_calibrate_mute(chip, 1);
        snd_ad1848_set_data_format(chip, hw_params);
        snd_ad1848_mce_up(chip);
        spin_lock_irqsave(&chip->reg_lock, flags);
        snd_ad1848_out(chip, AD1848_DATA_FORMAT, chip->image[AD1848_DATA_FORMAT]);
        spin_unlock_irqrestore(&chip->reg_lock, flags);
        snd_ad1848_mce_down(chip);
        snd_ad1848_calibrate_mute(chip, 0);
        return 0;
}

static int snd_ad1848_playback_hw_free(struct snd_pcm_substream *substream)
{
        return snd_pcm_lib_free_pages(substream);
}

static int snd_ad1848_playback_prepare(struct snd_pcm_substream *substream)
{
        struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        unsigned long flags;
        unsigned int size = snd_pcm_lib_buffer_bytes(substream);
        unsigned int count = snd_pcm_lib_period_bytes(substream);

        chip->dma_size = size;
        chip->image[AD1848_IFACE_CTRL] &= ~(AD1848_PLAYBACK_ENABLE | AD1848_PLAYBACK_PIO);
        snd_dma_program(chip->dma, runtime->dma_addr, size, DMA_MODE_WRITE | DMA_AUTOINIT);
        count = snd_ad1848_get_count(chip->image[AD1848_DATA_FORMAT], count) - 1;
        spin_lock_irqsave(&chip->reg_lock, flags);
        snd_ad1848_out(chip, AD1848_DATA_LWR_CNT, (unsigned char) count);
        snd_ad1848_out(chip, AD1848_DATA_UPR_CNT, (unsigned char) (count >> 8));
        spin_unlock_irqrestore(&chip->reg_lock, flags);
        return 0;
}

static int snd_ad1848_capture_hw_params(struct snd_pcm_substream *substream,
                                        struct snd_pcm_hw_params *hw_params)
{
        struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
        unsigned long flags;
        int err;

        if ((err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0)
                return err;
        snd_ad1848_calibrate_mute(chip, 1);
        snd_ad1848_set_data_format(chip, hw_params);
        snd_ad1848_mce_up(chip);
        spin_lock_irqsave(&chip->reg_lock, flags);
        snd_ad1848_out(chip, AD1848_DATA_FORMAT, chip->image[AD1848_DATA_FORMAT]);
        spin_unlock_irqrestore(&chip->reg_lock, flags);
        snd_ad1848_mce_down(chip);
        snd_ad1848_calibrate_mute(chip, 0);
        return 0;
}

static int snd_ad1848_capture_hw_free(struct snd_pcm_substream *substream)
{
        return snd_pcm_lib_free_pages(substream);
}

static int snd_ad1848_capture_prepare(struct snd_pcm_substream *substream)
{
        struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        unsigned long flags;
        unsigned int size = snd_pcm_lib_buffer_bytes(substream);
        unsigned int count = snd_pcm_lib_period_bytes(substream);

        chip->dma_size = size;
        chip->image[AD1848_IFACE_CTRL] &= ~(AD1848_CAPTURE_ENABLE | AD1848_CAPTURE_PIO);
        snd_dma_program(chip->dma, runtime->dma_addr, size, DMA_MODE_READ | DMA_AUTOINIT);
        count = snd_ad1848_get_count(chip->image[AD1848_DATA_FORMAT], count) - 1;
        spin_lock_irqsave(&chip->reg_lock, flags);
        snd_ad1848_out(chip, AD1848_DATA_LWR_CNT, (unsigned char) count);
        snd_ad1848_out(chip, AD1848_DATA_UPR_CNT, (unsigned char) (count >> 8));
        spin_unlock_irqrestore(&chip->reg_lock, flags);
        return 0;
}

static irqreturn_t snd_ad1848_interrupt(int irq, void *dev_id)
{
        struct snd_ad1848 *chip = dev_id;

        if ((chip->mode & AD1848_MODE_PLAY) && chip->playback_substream &&
            (chip->mode & AD1848_MODE_RUNNING))
                snd_pcm_period_elapsed(chip->playback_substream);
        if ((chip->mode & AD1848_MODE_CAPTURE) && chip->capture_substream &&
            (chip->mode & AD1848_MODE_RUNNING))
                snd_pcm_period_elapsed(chip->capture_substream);
        outb(0, AD1848P(chip, STATUS)); /* clear global interrupt bit */
        return IRQ_HANDLED;
}

static snd_pcm_uframes_t snd_ad1848_playback_pointer(struct snd_pcm_substream *substream)
{
        struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
        size_t ptr;
        
        if (!(chip->image[AD1848_IFACE_CTRL] & AD1848_PLAYBACK_ENABLE))
                return 0;
        ptr = snd_dma_pointer(chip->dma, chip->dma_size);
        return bytes_to_frames(substream->runtime, ptr);
}

static snd_pcm_uframes_t snd_ad1848_capture_pointer(struct snd_pcm_substream *substream)
{
        struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
        size_t ptr;

        if (!(chip->image[AD1848_IFACE_CTRL] & AD1848_CAPTURE_ENABLE))
                return 0;
        ptr = snd_dma_pointer(chip->dma, chip->dma_size);
        return bytes_to_frames(substream->runtime, ptr);
}

/*

 */

static void snd_ad1848_thinkpad_twiddle(struct snd_ad1848 *chip, int on) {

        int tmp;

        if (!chip->thinkpad_flag) return;

        outb(0x1c, AD1848_THINKPAD_CTL_PORT1);
        tmp = inb(AD1848_THINKPAD_CTL_PORT2);

        if (on)
                /* turn it on */
                tmp |= AD1848_THINKPAD_CS4248_ENABLE_BIT;
        else
                /* turn it off */
                tmp &= ~AD1848_THINKPAD_CS4248_ENABLE_BIT;
        
        outb(tmp, AD1848_THINKPAD_CTL_PORT2);

}

#ifdef CONFIG_PM
static void snd_ad1848_suspend(struct snd_ad1848 *chip)
{
        snd_pcm_suspend_all(chip->pcm);
        if (chip->thinkpad_flag)
                snd_ad1848_thinkpad_twiddle(chip, 0);
}

static void snd_ad1848_resume(struct snd_ad1848 *chip)
{
        int i;

        if (chip->thinkpad_flag)
                snd_ad1848_thinkpad_twiddle(chip, 1);

        /* clear any pendings IRQ */
        inb(AD1848P(chip, STATUS));
        outb(0, AD1848P(chip, STATUS));
        mb();

        snd_ad1848_mce_down(chip);
        for (i = 0; i < 16; i++)
                snd_ad1848_out(chip, i, chip->image[i]);
        snd_ad1848_mce_up(chip);
        snd_ad1848_mce_down(chip);
}
#endif /* CONFIG_PM */

static int snd_ad1848_probe(struct snd_ad1848 * chip)
{
        unsigned long flags;
        int i, id, rev, ad1847;
        unsigned char *ptr;

#if 0
        snd_ad1848_debug(chip);
#endif
        id = ad1847 = 0;
        for (i = 0; i < 1000; i++) {
                mb();
                if (inb(AD1848P(chip, REGSEL)) & AD1848_INIT)
                        udelay(500);
                else {
                        spin_lock_irqsave(&chip->reg_lock, flags);
                        snd_ad1848_out(chip, AD1848_MISC_INFO, 0x00);
                        snd_ad1848_out(chip, AD1848_LEFT_INPUT, 0xaa);
                        snd_ad1848_out(chip, AD1848_RIGHT_INPUT, 0x45);
                        rev = snd_ad1848_in(chip, AD1848_RIGHT_INPUT);
                        if (rev == 0x65) {
                                spin_unlock_irqrestore(&chip->reg_lock, flags);
                                id = 1;
                                ad1847 = 1;
                                break;
                        }
                        if (snd_ad1848_in(chip, AD1848_LEFT_INPUT) == 0xaa && rev == 0x45) {
                                spin_unlock_irqrestore(&chip->reg_lock, flags);
                                id = 1;
                                break;
                        }
                        spin_unlock_irqrestore(&chip->reg_lock, flags);
                }
        }
        if (id != 1)
                return -ENODEV; /* no valid device found */
        if (chip->hardware == AD1848_HW_DETECT) {
                if (ad1847) {
                        chip->hardware = AD1848_HW_AD1847;
                } else {
                        chip->hardware = AD1848_HW_AD1848;
                        rev = snd_ad1848_in(chip, AD1848_MISC_INFO);
                        if (rev & 0x80) {
                                chip->hardware = AD1848_HW_CS4248;
                        } else if ((rev & 0x0f) == 0x0a) {
                                snd_ad1848_out(chip, AD1848_MISC_INFO, 0x40);
                                for (i = 0; i < 16; ++i) {
                                        if (snd_ad1848_in(chip, i) != snd_ad1848_in(chip, i + 16)) {
                                                chip->hardware = AD1848_HW_CMI8330;
                                                break;
                                        }
                                }
                                snd_ad1848_out(chip, AD1848_MISC_INFO, 0x00);
                        }
                }
        }
        spin_lock_irqsave(&chip->reg_lock, flags);
        inb(AD1848P(chip, STATUS));     /* clear any pendings IRQ */
        outb(0, AD1848P(chip, STATUS));
        mb();
        spin_unlock_irqrestore(&chip->reg_lock, flags);

        chip->image[AD1848_MISC_INFO] = 0x00;
        chip->image[AD1848_IFACE_CTRL] =
            (chip->image[AD1848_IFACE_CTRL] & ~AD1848_SINGLE_DMA) | AD1848_SINGLE_DMA;
        ptr = (unsigned char *) &chip->image;
        snd_ad1848_mce_down(chip);
        spin_lock_irqsave(&chip->reg_lock, flags);
        for (i = 0; i < 16; i++)        /* ok.. fill all AD1848 registers */
                snd_ad1848_out(chip, i, *ptr++);
        spin_unlock_irqrestore(&chip->reg_lock, flags);
        snd_ad1848_mce_up(chip);
        snd_ad1848_mce_down(chip);
        return 0;               /* all things are ok.. */
}

/*

 */

static struct snd_pcm_hardware snd_ad1848_playback =
{
        .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
                                 SNDRV_PCM_INFO_MMAP_VALID),
        .formats =              (SNDRV_PCM_FMTBIT_MU_LAW | SNDRV_PCM_FMTBIT_A_LAW |
                                 SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE),
        .rates =                SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_8000_48000,
        .rate_min =             5510,
        .rate_max =             48000,
        .channels_min =         1,
        .channels_max =         2,
        .buffer_bytes_max =     (128*1024),
        .period_bytes_min =     64,
        .period_bytes_max =     (128*1024),
        .periods_min =          1,
        .periods_max =          1024,
        .fifo_size =            0,
};

static struct snd_pcm_hardware snd_ad1848_capture =
{
        .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
                                 SNDRV_PCM_INFO_MMAP_VALID),
        .formats =              (SNDRV_PCM_FMTBIT_MU_LAW | SNDRV_PCM_FMTBIT_A_LAW |
                                 SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE),
        .rates =                SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_8000_48000,
        .rate_min =             5510,
        .rate_max =             48000,
        .channels_min =         1,
        .channels_max =         2,
        .buffer_bytes_max =     (128*1024),
        .period_bytes_min =     64,
        .period_bytes_max =     (128*1024),
        .periods_min =          1,
        .periods_max =          1024,
        .fifo_size =            0,
};

/*

 */

static int snd_ad1848_playback_open(struct snd_pcm_substream *substream)
{
        struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        int err;

        if ((err = snd_ad1848_open(chip, AD1848_MODE_PLAY)) < 0)
                return err;
        chip->playback_substream = substream;
        runtime->hw = snd_ad1848_playback;
        snd_pcm_limit_isa_dma_size(chip->dma, &runtime->hw.buffer_bytes_max);
        snd_pcm_limit_isa_dma_size(chip->dma, &runtime->hw.period_bytes_max);
        snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates);
        return 0;
}

static int snd_ad1848_capture_open(struct snd_pcm_substream *substream)
{
        struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        int err;

        if ((err = snd_ad1848_open(chip, AD1848_MODE_CAPTURE)) < 0)
                return err;
        chip->capture_substream = substream;
        runtime->hw = snd_ad1848_capture;
        snd_pcm_limit_isa_dma_size(chip->dma, &runtime->hw.buffer_bytes_max);
        snd_pcm_limit_isa_dma_size(chip->dma, &runtime->hw.period_bytes_max);
        snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates);
        return 0;
}

static int snd_ad1848_playback_close(struct snd_pcm_substream *substream)
{
        struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);

        chip->mode &= ~AD1848_MODE_PLAY;
        chip->playback_substream = NULL;
        snd_ad1848_close(chip);
        return 0;
}

static int snd_ad1848_capture_close(struct snd_pcm_substream *substream)
{
        struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);

        chip->mode &= ~AD1848_MODE_CAPTURE;
        chip->capture_substream = NULL;
        snd_ad1848_close(chip);
        return 0;
}

static int snd_ad1848_free(struct snd_ad1848 *chip)
{
        release_and_free_resource(chip->res_port);
        if (chip->irq >= 0)
                free_irq(chip->irq, (void *) chip);
        if (chip->dma >= 0) {
                snd_dma_disable(chip->dma);
                free_dma(chip->dma);
        }
        kfree(chip);
        return 0;
}

static int snd_ad1848_dev_free(struct snd_device *device)
{
        struct snd_ad1848 *chip = device->device_data;
        return snd_ad1848_free(chip);
}

static const char *snd_ad1848_chip_id(struct snd_ad1848 *chip)
{
        switch (chip->hardware) {
        case AD1848_HW_AD1847:  return "AD1847";
        case AD1848_HW_AD1848:  return "AD1848";
        case AD1848_HW_CS4248:  return "CS4248";
        case AD1848_HW_CMI8330: return "CMI8330/C3D";
        default:                return "???";
        }
}

int snd_ad1848_create(struct snd_card *card,
                      unsigned long port,
                      int irq, int dma,
                      unsigned short hardware,
                      struct snd_ad1848 ** rchip)
{
        static struct snd_device_ops ops = {
                .dev_free =     snd_ad1848_dev_free,
        };
        struct snd_ad1848 *chip;
        int err;

        *rchip = NULL;
        chip = kzalloc(sizeof(*chip), GFP_KERNEL);
        if (chip == NULL)
                return -ENOMEM;
        spin_lock_init(&chip->reg_lock);
        mutex_init(&chip->open_mutex);
        chip->card = card;
        chip->port = port;
        chip->irq = -1;
        chip->dma = -1;
        chip->hardware = hardware;
        memcpy(&chip->image, &snd_ad1848_original_image, sizeof(snd_ad1848_original_image));
        
        if ((chip->res_port = request_region(port, 4, "AD1848")) == NULL) {
                snd_printk(KERN_ERR "ad1848: can't grab port 0x%lx\n", port);
                snd_ad1848_free(chip);
                return -EBUSY;
        }
        if (request_irq(irq, snd_ad1848_interrupt, IRQF_DISABLED, "AD1848", (void *) chip)) {
                snd_printk(KERN_ERR "ad1848: can't grab IRQ %d\n", irq);
                snd_ad1848_free(chip);
                return -EBUSY;
        }
        chip->irq = irq;
        if (request_dma(dma, "AD1848")) {
                snd_printk(KERN_ERR "ad1848: can't grab DMA %d\n", dma);
                snd_ad1848_free(chip);
                return -EBUSY;
        }
        chip->dma = dma;

        if (hardware == AD1848_HW_THINKPAD) {
                chip->thinkpad_flag = 1;
                chip->hardware = AD1848_HW_DETECT; /* reset */
                snd_ad1848_thinkpad_twiddle(chip, 1);
        }

        if (snd_ad1848_probe(chip) < 0) {
                snd_ad1848_free(chip);
                return -ENODEV;
        }

        /* Register device */
        if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
                snd_ad1848_free(chip);
                return err;
        }

#ifdef CONFIG_PM
        chip->suspend = snd_ad1848_suspend;
        chip->resume = snd_ad1848_resume;
#endif

        *rchip = chip;
        return 0;
}

EXPORT_SYMBOL(snd_ad1848_create);

static struct snd_pcm_ops snd_ad1848_playback_ops = {
        .open =         snd_ad1848_playback_open,
        .close =        snd_ad1848_playback_close,
        .ioctl =        snd_ad1848_ioctl,
        .hw_params =    snd_ad1848_playback_hw_params,
        .hw_free =      snd_ad1848_playback_hw_free,
        .prepare =      snd_ad1848_playback_prepare,
        .trigger =      snd_ad1848_playback_trigger,
        .pointer =      snd_ad1848_playback_pointer,
};

static struct snd_pcm_ops snd_ad1848_capture_ops = {
        .open =         snd_ad1848_capture_open,
        .close =        snd_ad1848_capture_close,
        .ioctl =        snd_ad1848_ioctl,
        .hw_params =    snd_ad1848_capture_hw_params,
        .hw_free =      snd_ad1848_capture_hw_free,
        .prepare =      snd_ad1848_capture_prepare,
        .trigger =      snd_ad1848_capture_trigger,
        .pointer =      snd_ad1848_capture_pointer,
};

int snd_ad1848_pcm(struct snd_ad1848 *chip, int device, struct snd_pcm **rpcm)
{
        struct snd_pcm *pcm;
        int err;

        if ((err = snd_pcm_new(chip->card, "AD1848", device, 1, 1, &pcm)) < 0)
                return err;

        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_ad1848_playback_ops);
        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_ad1848_capture_ops);

        pcm->private_data = chip;
        pcm->info_flags = SNDRV_PCM_INFO_HALF_DUPLEX;
        strcpy(pcm->name, snd_ad1848_chip_id(chip));

        snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
                                              snd_dma_isa_data(),
                                              64*1024, chip->dma > 3 ? 128*1024 : 64*1024);

        chip->pcm = pcm;
        if (rpcm)
                *rpcm = pcm;
        return 0;
}

EXPORT_SYMBOL(snd_ad1848_pcm);

const struct snd_pcm_ops *snd_ad1848_get_pcm_ops(int direction)
{
        return direction == SNDRV_PCM_STREAM_PLAYBACK ?
                &snd_ad1848_playback_ops : &snd_ad1848_capture_ops;
}

EXPORT_SYMBOL(snd_ad1848_get_pcm_ops);

/*
 *  MIXER part
 */

static int snd_ad1848_info_mux(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
{
        static char *texts[4] = {
                "Line", "Aux", "Mic", "Mix"
        };

        uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
        uinfo->count = 2;
        uinfo->value.enumerated.items = 4;
        if (uinfo->value.enumerated.item > 3)
                uinfo->value.enumerated.item = 3;
        strcpy(uinfo->value.enumerated.name, texts[uinfo->value.enumerated.item]);
        return 0;
}

static int snd_ad1848_get_mux(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
        struct snd_ad1848 *chip = snd_kcontrol_chip(kcontrol);
        unsigned long flags;
        
        spin_lock_irqsave(&chip->reg_lock, flags);
        ucontrol->value.enumerated.item[0] = (chip->image[AD1848_LEFT_INPUT] & AD1848_MIXS_ALL) >> 6;
        ucontrol->value.enumerated.item[1] = (chip->image[AD1848_RIGHT_INPUT] & AD1848_MIXS_ALL) >> 6;
        spin_unlock_irqrestore(&chip->reg_lock, flags);
        return 0;
}

static int snd_ad1848_put_mux(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
        struct snd_ad1848 *chip = snd_kcontrol_chip(kcontrol);
        unsigned long flags;
        unsigned short left, right;
        int change;
        
        if (ucontrol->value.enumerated.item[0] > 3 ||
            ucontrol->value.enumerated.item[1] > 3)
                return -EINVAL;
        left = ucontrol->value.enumerated.item[0] << 6;
        right = ucontrol->value.enumerated.item[1] << 6;
        spin_lock_irqsave(&chip->reg_lock, flags);
        left = (chip->image[AD1848_LEFT_INPUT] & ~AD1848_MIXS_ALL) | left;
        right = (chip->image[AD1848_RIGHT_INPUT] & ~AD1848_MIXS_ALL) | right;
        change = left != chip->image[AD1848_LEFT_INPUT] ||
                 right != chip->image[AD1848_RIGHT_INPUT];
        snd_ad1848_out(chip, AD1848_LEFT_INPUT, left);
        snd_ad1848_out(chip, AD1848_RIGHT_INPUT, right);
        spin_unlock_irqrestore(&chip->reg_lock, flags);
        return change;
}

static int snd_ad1848_info_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
{
        int mask = (kcontrol->private_value >> 16) & 0xff;

        uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
        uinfo->count = 1;
        uinfo->value.integer.min = 0;
        uinfo->value.integer.max = mask;
        return 0;
}

static int snd_ad1848_get_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
        struct snd_ad1848 *chip = snd_kcontrol_chip(kcontrol);
        unsigned long flags;
        int reg = kcontrol->private_value & 0xff;
        int shift = (kcontrol->private_value >> 8) & 0xff;
        int mask = (kcontrol->private_value >> 16) & 0xff;
        int invert = (kcontrol->private_value >> 24) & 0xff;
        
        spin_lock_irqsave(&chip->reg_lock, flags);
        ucontrol->value.integer.value[0] = (chip->image[reg] >> shift) & mask;
        spin_unlock_irqrestore(&chip->reg_lock, flags);
        if (invert)
                ucontrol->value.integer.value[0] = mask - ucontrol->value.integer.value[0];
        return 0;
}

static int snd_ad1848_put_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
        struct snd_ad1848 *chip = snd_kcontrol_chip(kcontrol);
        unsigned long flags;
        int reg = kcontrol->private_value & 0xff;
        int shift = (kcontrol->private_value >> 8) & 0xff;
        int mask = (kcontrol->private_value >> 16) & 0xff;
        int invert = (kcontrol->private_value >> 24) & 0xff;
        int change;
        unsigned short val;
        
        val = (ucontrol->value.integer.value[0] & mask);
        if (invert)
                val = mask - val;
        val <<= shift;
        spin_lock_irqsave(&chip->reg_lock, flags);
        val = (chip->image[reg] & ~(mask << shift)) | val;
        change = val != chip->image[reg];
        snd_ad1848_out(chip, reg, val);
        spin_unlock_irqrestore(&chip->reg_lock, flags);
        return change;
}

static int snd_ad1848_info_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
{
        int mask = (kcontrol->private_value >> 24) & 0xff;

        uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
        uinfo->count = 2;
        uinfo->value.integer.min = 0;
        uinfo->value.integer.max = mask;
        return 0;
}

static int snd_ad1848_get_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
        struct snd_ad1848 *chip = snd_kcontrol_chip(kcontrol);
        unsigned long flags;
        int left_reg = kcontrol->private_value & 0xff;
        int right_reg = (kcontrol->private_value >> 8) & 0xff;
        int shift_left = (kcontrol->private_value >> 16) & 0x07;
        int shift_right = (kcontrol->private_value >> 19) & 0x07;
        int mask = (kcontrol->private_value >> 24) & 0xff;
        int invert = (kcontrol->private_value >> 22) & 1;
        
        spin_lock_irqsave(&chip->reg_lock, flags);
        ucontrol->value.integer.value[0] = (chip->image[left_reg] >> shift_left) & mask;
        ucontrol->value.integer.value[1] = (chip->image[right_reg] >> shift_right) & mask;
        spin_unlock_irqrestore(&chip->reg_lock, flags);
        if (invert) {
                ucontrol->value.integer.value[0] = mask - ucontrol->value.integer.value[0];
                ucontrol->value.integer.value[1] = mask - ucontrol->value.integer.value[1];
        }
        return 0;
}

static int snd_ad1848_put_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
        struct snd_ad1848 *chip = snd_kcontrol_chip(kcontrol);
        unsigned long flags;
        int left_reg = kcontrol->private_value & 0xff;
        int right_reg = (kcontrol->private_value >> 8) & 0xff;
        int shift_left = (kcontrol->private_value >> 16) & 0x07;
        int shift_right = (kcontrol->private_value >> 19) & 0x07;
        int mask = (kcontrol->private_value >> 24) & 0xff;
        int invert = (kcontrol->private_value >> 22) & 1;
        int change;
        unsigned short val1, val2;
        
        val1 = ucontrol->value.integer.value[0] & mask;
        val2 = ucontrol->value.integer.value[1] & mask;
        if (invert) {
                val1 = mask - val1;
                val2 = mask - val2;
        }
        val1 <<= shift_left;
        val2 <<= shift_right;
        spin_lock_irqsave(&chip->reg_lock, flags);
        if (left_reg != right_reg) {
                val1 = (chip->image[left_reg] & ~(mask << shift_left)) | val1;
                val2 = (chip->image[right_reg] & ~(mask << shift_right)) | val2;
                change = val1 != chip->image[left_reg] || val2 != chip->image[right_reg];
                snd_ad1848_out(chip, left_reg, val1);
                snd_ad1848_out(chip, right_reg, val2);
        } else {
                val1 = (chip->image[left_reg] & ~((mask << shift_left) | (mask << shift_right))) | val1 | val2;
                change = val1 != chip->image[left_reg];
                snd_ad1848_out(chip, left_reg, val1);           
        }
        spin_unlock_irqrestore(&chip->reg_lock, flags);
        return change;
}

/*
 */
int snd_ad1848_add_ctl_elem(struct snd_ad1848 *chip,
                            const struct ad1848_mix_elem *c)
{
        static struct snd_kcontrol_new newctls[] = {
                [AD1848_MIX_SINGLE] = {
                        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
                        .info = snd_ad1848_info_single,
                        .get = snd_ad1848_get_single,
                        .put = snd_ad1848_put_single,
                },
                [AD1848_MIX_DOUBLE] = {
                        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
                        .info = snd_ad1848_info_double,
                        .get = snd_ad1848_get_double,
                        .put = snd_ad1848_put_double,
                },
                [AD1848_MIX_CAPTURE] = {
                        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
                        .info = snd_ad1848_info_mux,
                        .get = snd_ad1848_get_mux,
                        .put = snd_ad1848_put_mux,
                },
        };
        struct snd_kcontrol *ctl;
        int err;

        ctl = snd_ctl_new1(&newctls[c->type], chip);
        if (! ctl)
                return -ENOMEM;
        strlcpy(ctl->id.name, c->name, sizeof(ctl->id.name));
        ctl->id.index = c->index;
        ctl->private_value = c->private_value;
        if (c->tlv) {
                ctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ;
                ctl->tlv.p = c->tlv;
        }
        if ((err = snd_ctl_add(chip->card, ctl)) < 0)
                return err;
        return 0;
}

EXPORT_SYMBOL(snd_ad1848_add_ctl_elem);

static const DECLARE_TLV_DB_SCALE(db_scale_6bit, -9450, 150, 0);
static const DECLARE_TLV_DB_SCALE(db_scale_5bit_12db_max, -3450, 150, 0);
static const DECLARE_TLV_DB_SCALE(db_scale_rec_gain, 0, 150, 0);

static struct ad1848_mix_elem snd_ad1848_controls[] = {
AD1848_DOUBLE("PCM Playback Switch", 0, AD1848_LEFT_OUTPUT, AD1848_RIGHT_OUTPUT, 7, 7, 1, 1),
AD1848_DOUBLE_TLV("PCM Playback Volume", 0, AD1848_LEFT_OUTPUT, AD1848_RIGHT_OUTPUT, 0, 0, 63, 1,
                  db_scale_6bit),
AD1848_DOUBLE("Aux Playback Switch", 0, AD1848_AUX1_LEFT_INPUT, AD1848_AUX1_RIGHT_INPUT, 7, 7, 1, 1),
AD1848_DOUBLE_TLV("Aux Playback Volume", 0, AD1848_AUX1_LEFT_INPUT, AD1848_AUX1_RIGHT_INPUT, 0, 0, 31, 1,
                  db_scale_5bit_12db_max),
AD1848_DOUBLE("Aux Playback Switch", 1, AD1848_AUX2_LEFT_INPUT, AD1848_AUX2_RIGHT_INPUT, 7, 7, 1, 1),
AD1848_DOUBLE_TLV("Aux Playback Volume", 1, AD1848_AUX2_LEFT_INPUT, AD1848_AUX2_RIGHT_INPUT, 0, 0, 31, 1,
                  db_scale_5bit_12db_max),
AD1848_DOUBLE_TLV("Capture Volume", 0, AD1848_LEFT_INPUT, AD1848_RIGHT_INPUT, 0, 0, 15, 0,
                  db_scale_rec_gain),
{
        .name = "Capture Source",
        .type = AD1848_MIX_CAPTURE,
},
AD1848_SINGLE("Loopback Capture Switch", 0, AD1848_LOOPBACK, 0, 1, 0),
AD1848_SINGLE_TLV("Loopback Capture Volume", 0, AD1848_LOOPBACK, 1, 63, 0,
                  db_scale_6bit),
};
                                        
int snd_ad1848_mixer(struct snd_ad1848 *chip)
{
        struct snd_card *card;
        struct snd_pcm *pcm;
        unsigned int idx;
        int err;

        snd_assert(chip != NULL && chip->pcm != NULL, return -EINVAL);

        pcm = chip->pcm;
        card = chip->card;

        strcpy(card->mixername, pcm->name);

        for (idx = 0; idx < ARRAY_SIZE(snd_ad1848_controls); idx++)
                if ((err = snd_ad1848_add_ctl_elem(chip, &snd_ad1848_controls[idx])) < 0)
                        return err;

        return 0;
}

EXPORT_SYMBOL(snd_ad1848_mixer);

/*
 *  INIT part
 */

static int __init alsa_ad1848_init(void)
{
        return 0;
}

static void __exit alsa_ad1848_exit(void)
{
}

module_init(alsa_ad1848_init)
module_exit(alsa_ad1848_exit)