cs4231.c

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/*
 * Driver for CS4231 sound chips found on Sparcs.
 * Copyright (C) 2002, 2008 David S. Miller <[email protected]>
 *
 * Based entirely upon drivers/sbus/audio/cs4231.c which is:
 * Copyright (C) 1996, 1997, 1998 Derrick J Brashear ([email protected])
 * and also sound/isa/cs423x/cs4231_lib.c which is:
 * Copyright (c) by Jaroslav Kysela <[email protected]>
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/moduleparam.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_device.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/info.h>
#include <sound/control.h>
#include <sound/timer.h>
#include <sound/initval.h>
#include <sound/pcm_params.h>

#ifdef CONFIG_SBUS
#define SBUS_SUPPORT
#endif

#if defined(CONFIG_PCI) && defined(CONFIG_SPARC64)
#define EBUS_SUPPORT
#include <linux/pci.h>
#include <asm/ebus_dma.h>
#endif

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;  /* Index 0-MAX */
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;   /* ID for this card */
/* Enable this card */
static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for Sun CS4231 soundcard.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for Sun CS4231 soundcard.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable Sun CS4231 soundcard.");
MODULE_AUTHOR("Jaroslav Kysela, Derrick J. Brashear and David S. Miller");
MODULE_DESCRIPTION("Sun CS4231");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{Sun,CS4231}}");

#ifdef SBUS_SUPPORT
struct sbus_dma_info {
       spinlock_t   lock;   /* DMA access lock */
       int      dir;
       void __iomem *regs;
};
#endif

struct snd_cs4231;
struct cs4231_dma_control {
    void        (*prepare)(struct cs4231_dma_control *dma_cont,
                   int dir);
    void        (*enable)(struct cs4231_dma_control *dma_cont, int on);
    int     (*request)(struct cs4231_dma_control *dma_cont,
                   dma_addr_t bus_addr, size_t len);
    unsigned int    (*address)(struct cs4231_dma_control *dma_cont);
#ifdef EBUS_SUPPORT
    struct      ebus_dma_info   ebus_info;
#endif
#ifdef SBUS_SUPPORT
    struct      sbus_dma_info   sbus_info;
#endif
};

struct snd_cs4231 {
    spinlock_t      lock;   /* registers access lock */
    void __iomem        *port;

    struct cs4231_dma_control   p_dma;
    struct cs4231_dma_control   c_dma;

    u32         flags;
#define CS4231_FLAG_EBUS    0x00000001
#define CS4231_FLAG_PLAYBACK    0x00000002
#define CS4231_FLAG_CAPTURE 0x00000004

    struct snd_card     *card;
    struct snd_pcm      *pcm;
    struct snd_pcm_substream    *playback_substream;
    unsigned int        p_periods_sent;
    struct snd_pcm_substream    *capture_substream;
    unsigned int        c_periods_sent;
    struct snd_timer    *timer;

    unsigned short mode;
#define CS4231_MODE_NONE    0x0000
#define CS4231_MODE_PLAY    0x0001
#define CS4231_MODE_RECORD  0x0002
#define CS4231_MODE_TIMER   0x0004
#define CS4231_MODE_OPEN    (CS4231_MODE_PLAY | CS4231_MODE_RECORD | \
                 CS4231_MODE_TIMER)

    unsigned char       image[32];  /* registers image */
    int         mce_bit;
    int         calibrate_mute;
    struct mutex        mce_mutex;  /* mutex for mce register */
    struct mutex        open_mutex; /* mutex for ALSA open/close */

    struct platform_device  *op;
    unsigned int        irq[2];
    unsigned int        regs_size;
    struct snd_cs4231   *next;
};

/* Eventually we can use sound/isa/cs423x/cs4231_lib.c directly, but for
 * now....  -DaveM
 */

/* IO ports */
#include <sound/cs4231-regs.h>

/* XXX offsets are different than PC ISA chips... */
#define CS4231U(chip, x)    ((chip)->port + ((c_d_c_CS4231##x) << 2))

/* SBUS DMA register defines.  */

#define APCCSR  0x10UL  /* APC DMA CSR */
#define APCCVA  0x20UL  /* APC Capture DMA Address */
#define APCCC   0x24UL  /* APC Capture Count */
#define APCCNVA 0x28UL  /* APC Capture DMA Next Address */
#define APCCNC  0x2cUL  /* APC Capture Next Count */
#define APCPVA  0x30UL  /* APC Play DMA Address */
#define APCPC   0x34UL  /* APC Play Count */
#define APCPNVA 0x38UL  /* APC Play DMA Next Address */
#define APCPNC  0x3cUL  /* APC Play Next Count */

/* Defines for SBUS DMA-routines */

#define APCVA  0x0UL    /* APC DMA Address */
#define APCC   0x4UL    /* APC Count */
#define APCNVA 0x8UL    /* APC DMA Next Address */
#define APCNC  0xcUL    /* APC Next Count */
#define APC_PLAY 0x30UL /* Play registers start at 0x30 */
#define APC_RECORD 0x20UL /* Record registers start at 0x20 */

/* APCCSR bits */

#define APC_INT_PENDING 0x800000 /* Interrupt Pending */
#define APC_PLAY_INT    0x400000 /* Playback interrupt */
#define APC_CAPT_INT    0x200000 /* Capture interrupt */
#define APC_GENL_INT    0x100000 /* General interrupt */
#define APC_XINT_ENA    0x80000  /* General ext int. enable */
#define APC_XINT_PLAY   0x40000  /* Playback ext intr */
#define APC_XINT_CAPT   0x20000  /* Capture ext intr */
#define APC_XINT_GENL   0x10000  /* Error ext intr */
#define APC_XINT_EMPT   0x8000   /* Pipe empty interrupt (0 write to pva) */
#define APC_XINT_PEMP   0x4000   /* Play pipe empty (pva and pnva not set) */
#define APC_XINT_PNVA   0x2000   /* Playback NVA dirty */
#define APC_XINT_PENA   0x1000   /* play pipe empty Int enable */
#define APC_XINT_COVF   0x800    /* Cap data dropped on floor */
#define APC_XINT_CNVA   0x400    /* Capture NVA dirty */
#define APC_XINT_CEMP   0x200    /* Capture pipe empty (cva and cnva not set) */
#define APC_XINT_CENA   0x100    /* Cap. pipe empty int enable */
#define APC_PPAUSE      0x80     /* Pause the play DMA */
#define APC_CPAUSE      0x40     /* Pause the capture DMA */
#define APC_CDC_RESET   0x20     /* CODEC RESET */
#define APC_PDMA_READY  0x08     /* Play DMA Go */
#define APC_CDMA_READY  0x04     /* Capture DMA Go */
#define APC_CHIP_RESET  0x01     /* Reset the chip */

/* EBUS DMA register offsets  */

#define EBDMA_CSR   0x00UL  /* Control/Status */
#define EBDMA_ADDR  0x04UL  /* DMA Address */
#define EBDMA_COUNT 0x08UL  /* DMA Count */

/*
 *  Some variables
 */

static unsigned char freq_bits[14] = {
    /* 5510 */  0x00 | CS4231_XTAL2,
    /* 6620 */  0x0E | CS4231_XTAL2,
    /* 8000 */  0x00 | CS4231_XTAL1,
    /* 9600 */  0x0E | CS4231_XTAL1,
    /* 11025 */ 0x02 | CS4231_XTAL2,
    /* 16000 */ 0x02 | CS4231_XTAL1,
    /* 18900 */ 0x04 | CS4231_XTAL2,
    /* 22050 */ 0x06 | CS4231_XTAL2,
    /* 27042 */ 0x04 | CS4231_XTAL1,
    /* 32000 */ 0x06 | CS4231_XTAL1,
    /* 33075 */ 0x0C | CS4231_XTAL2,
    /* 37800 */ 0x08 | CS4231_XTAL2,
    /* 44100 */ 0x0A | CS4231_XTAL2,
    /* 48000 */ 0x0C | CS4231_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,
};

static int snd_cs4231_xrate(struct snd_pcm_runtime *runtime)
{
    return snd_pcm_hw_constraint_list(runtime, 0,
                      SNDRV_PCM_HW_PARAM_RATE,
                      &hw_constraints_rates);
}

static unsigned char snd_cs4231_original_image[32] =
{
    0x00,           /* 00/00 - lic */
    0x00,           /* 01/01 - ric */
    0x9f,           /* 02/02 - la1ic */
    0x9f,           /* 03/03 - ra1ic */
    0x9f,           /* 04/04 - la2ic */
    0x9f,           /* 05/05 - ra2ic */
    0xbf,           /* 06/06 - loc */
    0xbf,           /* 07/07 - roc */
    0x20,           /* 08/08 - pdfr */
    CS4231_AUTOCALIB,   /* 09/09 - ic */
    0x00,           /* 0a/10 - pc */
    0x00,           /* 0b/11 - ti */
    CS4231_MODE2,       /* 0c/12 - mi */
    0x00,           /* 0d/13 - lbc */
    0x00,           /* 0e/14 - pbru */
    0x00,           /* 0f/15 - pbrl */
    0x80,           /* 10/16 - afei */
    0x01,           /* 11/17 - afeii */
    0x9f,           /* 12/18 - llic */
    0x9f,           /* 13/19 - rlic */
    0x00,           /* 14/20 - tlb */
    0x00,           /* 15/21 - thb */
    0x00,           /* 16/22 - la3mic/reserved */
    0x00,           /* 17/23 - ra3mic/reserved */
    0x00,           /* 18/24 - afs */
    0x00,           /* 19/25 - lamoc/version */
    0x00,           /* 1a/26 - mioc */
    0x00,           /* 1b/27 - ramoc/reserved */
    0x20,           /* 1c/28 - cdfr */
    0x00,           /* 1d/29 - res4 */
    0x00,           /* 1e/30 - cbru */
    0x00,           /* 1f/31 - cbrl */
};

static u8 __cs4231_readb(struct snd_cs4231 *cp, void __iomem *reg_addr)
{
    if (cp->flags & CS4231_FLAG_EBUS)
        return readb(reg_addr);
    else
        return sbus_readb(reg_addr);
}

static void __cs4231_writeb(struct snd_cs4231 *cp, u8 val,
                void __iomem *reg_addr)
{
    if (cp->flags & CS4231_FLAG_EBUS)
        return writeb(val, reg_addr);
    else
        return sbus_writeb(val, reg_addr);
}

/*
 *  Basic I/O functions
 */

static void snd_cs4231_ready(struct snd_cs4231 *chip)
{
    int timeout;

    for (timeout = 250; timeout > 0; timeout--) {
        int val = __cs4231_readb(chip, CS4231U(chip, REGSEL));
        if ((val & CS4231_INIT) == 0)
            break;
        udelay(100);
    }
}

static void snd_cs4231_dout(struct snd_cs4231 *chip, unsigned char reg,
                unsigned char value)
{
    snd_cs4231_ready(chip);
#ifdef CONFIG_SND_DEBUG
    if (__cs4231_readb(chip, CS4231U(chip, REGSEL)) & CS4231_INIT)
        snd_printdd("out: auto calibration time out - reg = 0x%x, "
                "value = 0x%x\n",
                reg, value);
#endif
    __cs4231_writeb(chip, chip->mce_bit | reg, CS4231U(chip, REGSEL));
    wmb();
    __cs4231_writeb(chip, value, CS4231U(chip, REG));
    mb();
}

static inline void snd_cs4231_outm(struct snd_cs4231 *chip, unsigned char reg,
             unsigned char mask, unsigned char value)
{
    unsigned char tmp = (chip->image[reg] & mask) | value;

    chip->image[reg] = tmp;
    if (!chip->calibrate_mute)
        snd_cs4231_dout(chip, reg, tmp);
}

static void snd_cs4231_out(struct snd_cs4231 *chip, unsigned char reg,
               unsigned char value)
{
    snd_cs4231_dout(chip, reg, value);
    chip->image[reg] = value;
    mb();
}

static unsigned char snd_cs4231_in(struct snd_cs4231 *chip, unsigned char reg)
{
    snd_cs4231_ready(chip);
#ifdef CONFIG_SND_DEBUG
    if (__cs4231_readb(chip, CS4231U(chip, REGSEL)) & CS4231_INIT)
        snd_printdd("in: auto calibration time out - reg = 0x%x\n",
                reg);
#endif
    __cs4231_writeb(chip, chip->mce_bit | reg, CS4231U(chip, REGSEL));
    mb();
    return __cs4231_readb(chip, CS4231U(chip, REG));
}

/*
 *  CS4231 detection / MCE routines
 */

static void snd_cs4231_busy_wait(struct snd_cs4231 *chip)
{
    int timeout;

    /* looks like this sequence is proper for CS4231A chip (GUS MAX) */
    for (timeout = 5; timeout > 0; timeout--)
        __cs4231_readb(chip, CS4231U(chip, REGSEL));

    /* end of cleanup sequence */
    for (timeout = 500; timeout > 0; timeout--) {
        int val = __cs4231_readb(chip, CS4231U(chip, REGSEL));
        if ((val & CS4231_INIT) == 0)
            break;
        msleep(1);
    }
}

static void snd_cs4231_mce_up(struct snd_cs4231 *chip)
{
    unsigned long flags;
    int timeout;

    spin_lock_irqsave(&chip->lock, flags);
    snd_cs4231_ready(chip);
#ifdef CONFIG_SND_DEBUG
    if (__cs4231_readb(chip, CS4231U(chip, REGSEL)) & CS4231_INIT)
        snd_printdd("mce_up - auto calibration time out (0)\n");
#endif
    chip->mce_bit |= CS4231_MCE;
    timeout = __cs4231_readb(chip, CS4231U(chip, REGSEL));
    if (timeout == 0x80)
        snd_printdd("mce_up [%p]: serious init problem - "
                "codec still busy\n",
                chip->port);
    if (!(timeout & CS4231_MCE))
        __cs4231_writeb(chip, chip->mce_bit | (timeout & 0x1f),
                CS4231U(chip, REGSEL));
    spin_unlock_irqrestore(&chip->lock, flags);
}

static void snd_cs4231_mce_down(struct snd_cs4231 *chip)
{
    unsigned long flags, timeout;
    int reg;

    snd_cs4231_busy_wait(chip);
    spin_lock_irqsave(&chip->lock, flags);
#ifdef CONFIG_SND_DEBUG
    if (__cs4231_readb(chip, CS4231U(chip, REGSEL)) & CS4231_INIT)
        snd_printdd("mce_down [%p] - auto calibration time out (0)\n",
                CS4231U(chip, REGSEL));
#endif
    chip->mce_bit &= ~CS4231_MCE;
    reg = __cs4231_readb(chip, CS4231U(chip, REGSEL));
    __cs4231_writeb(chip, chip->mce_bit | (reg & 0x1f),
            CS4231U(chip, REGSEL));
    if (reg == 0x80)
        snd_printdd("mce_down [%p]: serious init problem "
                "- codec still busy\n", chip->port);
    if ((reg & CS4231_MCE) == 0) {
        spin_unlock_irqrestore(&chip->lock, flags);
        return;
    }

    /*
     * Wait for auto-calibration (AC) process to finish, i.e. ACI to go low.
     */
    timeout = jiffies + msecs_to_jiffies(250);
    do {
        spin_unlock_irqrestore(&chip->lock, flags);
        msleep(1);
        spin_lock_irqsave(&chip->lock, flags);
        reg = snd_cs4231_in(chip, CS4231_TEST_INIT);
        reg &= CS4231_CALIB_IN_PROGRESS;
    } while (reg && time_before(jiffies, timeout));
    spin_unlock_irqrestore(&chip->lock, flags);

    if (reg)
        snd_printk(KERN_ERR
               "mce_down - auto calibration time out (2)\n");
}

static void snd_cs4231_advance_dma(struct cs4231_dma_control *dma_cont,
                   struct snd_pcm_substream *substream,
                   unsigned int *periods_sent)
{
    struct snd_pcm_runtime *runtime = substream->runtime;

    while (1) {
        unsigned int period_size = snd_pcm_lib_period_bytes(substream);
        unsigned int offset = period_size * (*periods_sent);

        BUG_ON(period_size >= (1 << 24));

        if (dma_cont->request(dma_cont,
                      runtime->dma_addr + offset, period_size))
            return;
        (*periods_sent) = ((*periods_sent) + 1) % runtime->periods;
    }
}

static void cs4231_dma_trigger(struct snd_pcm_substream *substream,
                   unsigned int what, int on)
{
    struct snd_cs4231 *chip = snd_pcm_substream_chip(substream);
    struct cs4231_dma_control *dma_cont;

    if (what & CS4231_PLAYBACK_ENABLE) {
        dma_cont = &chip->p_dma;
        if (on) {
            dma_cont->prepare(dma_cont, 0);
            dma_cont->enable(dma_cont, 1);
            snd_cs4231_advance_dma(dma_cont,
                chip->playback_substream,
                &chip->p_periods_sent);
        } else {
            dma_cont->enable(dma_cont, 0);
        }
    }
    if (what & CS4231_RECORD_ENABLE) {
        dma_cont = &chip->c_dma;
        if (on) {
            dma_cont->prepare(dma_cont, 1);
            dma_cont->enable(dma_cont, 1);
            snd_cs4231_advance_dma(dma_cont,
                chip->capture_substream,
                &chip->c_periods_sent);
        } else {
            dma_cont->enable(dma_cont, 0);
        }
    }
}

static int snd_cs4231_trigger(struct snd_pcm_substream *substream, int cmd)
{
    struct snd_cs4231 *chip = snd_pcm_substream_chip(substream);
    int result = 0;

    switch (cmd) {
    case SNDRV_PCM_TRIGGER_START:
    case SNDRV_PCM_TRIGGER_STOP:
    {
        unsigned int what = 0;
        struct snd_pcm_substream *s;
        unsigned long flags;

        snd_pcm_group_for_each_entry(s, substream) {
            if (s == chip->playback_substream) {
                what |= CS4231_PLAYBACK_ENABLE;
                snd_pcm_trigger_done(s, substream);
            } else if (s == chip->capture_substream) {
                what |= CS4231_RECORD_ENABLE;
                snd_pcm_trigger_done(s, substream);
            }
        }

        spin_lock_irqsave(&chip->lock, flags);
        if (cmd == SNDRV_PCM_TRIGGER_START) {
            cs4231_dma_trigger(substream, what, 1);
            chip->image[CS4231_IFACE_CTRL] |= what;
        } else {
            cs4231_dma_trigger(substream, what, 0);
            chip->image[CS4231_IFACE_CTRL] &= ~what;
        }
        snd_cs4231_out(chip, CS4231_IFACE_CTRL,
                   chip->image[CS4231_IFACE_CTRL]);
        spin_unlock_irqrestore(&chip->lock, flags);
        break;
    }
    default:
        result = -EINVAL;
        break;
    }

    return result;
}

/*
 *  CODEC I/O
 */

static unsigned char snd_cs4231_get_rate(unsigned int rate)
{
    int i;

    for (i = 0; i < 14; i++)
        if (rate == rates[i])
            return freq_bits[i];

    return freq_bits[13];
}

static unsigned char snd_cs4231_get_format(struct snd_cs4231 *chip, int format,
                       int channels)
{
    unsigned char rformat;

    rformat = CS4231_LINEAR_8;
    switch (format) {
    case SNDRV_PCM_FORMAT_MU_LAW:
        rformat = CS4231_ULAW_8;
        break;
    case SNDRV_PCM_FORMAT_A_LAW:
        rformat = CS4231_ALAW_8;
        break;
    case SNDRV_PCM_FORMAT_S16_LE:
        rformat = CS4231_LINEAR_16;
        break;
    case SNDRV_PCM_FORMAT_S16_BE:
        rformat = CS4231_LINEAR_16_BIG;
        break;
    case SNDRV_PCM_FORMAT_IMA_ADPCM:
        rformat = CS4231_ADPCM_16;
        break;
    }
    if (channels > 1)
        rformat |= CS4231_STEREO;
    return rformat;
}

static void snd_cs4231_calibrate_mute(struct snd_cs4231 *chip, int mute)
{
    unsigned long flags;

    mute = mute ? 1 : 0;
    spin_lock_irqsave(&chip->lock, flags);
    if (chip->calibrate_mute == mute) {
        spin_unlock_irqrestore(&chip->lock, flags);
        return;
    }
    if (!mute) {
        snd_cs4231_dout(chip, CS4231_LEFT_INPUT,
                chip->image[CS4231_LEFT_INPUT]);
        snd_cs4231_dout(chip, CS4231_RIGHT_INPUT,
                chip->image[CS4231_RIGHT_INPUT]);
        snd_cs4231_dout(chip, CS4231_LOOPBACK,
                chip->image[CS4231_LOOPBACK]);
    }
    snd_cs4231_dout(chip, CS4231_AUX1_LEFT_INPUT,
            mute ? 0x80 : chip->image[CS4231_AUX1_LEFT_INPUT]);
    snd_cs4231_dout(chip, CS4231_AUX1_RIGHT_INPUT,
            mute ? 0x80 : chip->image[CS4231_AUX1_RIGHT_INPUT]);
    snd_cs4231_dout(chip, CS4231_AUX2_LEFT_INPUT,
            mute ? 0x80 : chip->image[CS4231_AUX2_LEFT_INPUT]);
    snd_cs4231_dout(chip, CS4231_AUX2_RIGHT_INPUT,
            mute ? 0x80 : chip->image[CS4231_AUX2_RIGHT_INPUT]);
    snd_cs4231_dout(chip, CS4231_LEFT_OUTPUT,
            mute ? 0x80 : chip->image[CS4231_LEFT_OUTPUT]);
    snd_cs4231_dout(chip, CS4231_RIGHT_OUTPUT,
            mute ? 0x80 : chip->image[CS4231_RIGHT_OUTPUT]);
    snd_cs4231_dout(chip, CS4231_LEFT_LINE_IN,
            mute ? 0x80 : chip->image[CS4231_LEFT_LINE_IN]);
    snd_cs4231_dout(chip, CS4231_RIGHT_LINE_IN,
            mute ? 0x80 : chip->image[CS4231_RIGHT_LINE_IN]);
    snd_cs4231_dout(chip, CS4231_MONO_CTRL,
            mute ? 0xc0 : chip->image[CS4231_MONO_CTRL]);
    chip->calibrate_mute = mute;
    spin_unlock_irqrestore(&chip->lock, flags);
}

static void snd_cs4231_playback_format(struct snd_cs4231 *chip,
                       struct snd_pcm_hw_params *params,
                       unsigned char pdfr)
{
    unsigned long flags;

    mutex_lock(&chip->mce_mutex);
    snd_cs4231_calibrate_mute(chip, 1);

    snd_cs4231_mce_up(chip);

    spin_lock_irqsave(&chip->lock, flags);
    snd_cs4231_out(chip, CS4231_PLAYBK_FORMAT,
               (chip->image[CS4231_IFACE_CTRL] & CS4231_RECORD_ENABLE) ?
               (pdfr & 0xf0) | (chip->image[CS4231_REC_FORMAT] & 0x0f) :
               pdfr);
    spin_unlock_irqrestore(&chip->lock, flags);

    snd_cs4231_mce_down(chip);

    snd_cs4231_calibrate_mute(chip, 0);
    mutex_unlock(&chip->mce_mutex);
}

static void snd_cs4231_capture_format(struct snd_cs4231 *chip,
                      struct snd_pcm_hw_params *params,
                      unsigned char cdfr)
{
    unsigned long flags;

    mutex_lock(&chip->mce_mutex);
    snd_cs4231_calibrate_mute(chip, 1);

    snd_cs4231_mce_up(chip);

    spin_lock_irqsave(&chip->lock, flags);
    if (!(chip->image[CS4231_IFACE_CTRL] & CS4231_PLAYBACK_ENABLE)) {
        snd_cs4231_out(chip, CS4231_PLAYBK_FORMAT,
                   ((chip->image[CS4231_PLAYBK_FORMAT]) & 0xf0) |
                   (cdfr & 0x0f));
        spin_unlock_irqrestore(&chip->lock, flags);
        snd_cs4231_mce_down(chip);
        snd_cs4231_mce_up(chip);
        spin_lock_irqsave(&chip->lock, flags);
    }
    snd_cs4231_out(chip, CS4231_REC_FORMAT, cdfr);
    spin_unlock_irqrestore(&chip->lock, flags);

    snd_cs4231_mce_down(chip);

    snd_cs4231_calibrate_mute(chip, 0);
    mutex_unlock(&chip->mce_mutex);
}

/*
 *  Timer interface
 */

static unsigned long snd_cs4231_timer_resolution(struct snd_timer *timer)
{
    struct snd_cs4231 *chip = snd_timer_chip(timer);

    return chip->image[CS4231_PLAYBK_FORMAT] & 1 ? 9969 : 9920;
}

static int snd_cs4231_timer_start(struct snd_timer *timer)
{
    unsigned long flags;
    unsigned int ticks;
    struct snd_cs4231 *chip = snd_timer_chip(timer);

    spin_lock_irqsave(&chip->lock, flags);
    ticks = timer->sticks;
    if ((chip->image[CS4231_ALT_FEATURE_1] & CS4231_TIMER_ENABLE) == 0 ||
        (unsigned char)(ticks >> 8) != chip->image[CS4231_TIMER_HIGH] ||
        (unsigned char)ticks != chip->image[CS4231_TIMER_LOW]) {
        snd_cs4231_out(chip, CS4231_TIMER_HIGH,
                   chip->image[CS4231_TIMER_HIGH] =
                   (unsigned char) (ticks >> 8));
        snd_cs4231_out(chip, CS4231_TIMER_LOW,
                   chip->image[CS4231_TIMER_LOW] =
                   (unsigned char) ticks);
        snd_cs4231_out(chip, CS4231_ALT_FEATURE_1,
                   chip->image[CS4231_ALT_FEATURE_1] |
                    CS4231_TIMER_ENABLE);
    }
    spin_unlock_irqrestore(&chip->lock, flags);

    return 0;
}

static int snd_cs4231_timer_stop(struct snd_timer *timer)
{
    unsigned long flags;
    struct snd_cs4231 *chip = snd_timer_chip(timer);

    spin_lock_irqsave(&chip->lock, flags);
    chip->image[CS4231_ALT_FEATURE_1] &= ~CS4231_TIMER_ENABLE;
    snd_cs4231_out(chip, CS4231_ALT_FEATURE_1,
               chip->image[CS4231_ALT_FEATURE_1]);
    spin_unlock_irqrestore(&chip->lock, flags);

    return 0;
}

static void __devinit snd_cs4231_init(struct snd_cs4231 *chip)
{
    unsigned long flags;

    snd_cs4231_mce_down(chip);

#ifdef SNDRV_DEBUG_MCE
    snd_printdd("init: (1)\n");
#endif
    snd_cs4231_mce_up(chip);
    spin_lock_irqsave(&chip->lock, flags);
    chip->image[CS4231_IFACE_CTRL] &= ~(CS4231_PLAYBACK_ENABLE |
                        CS4231_PLAYBACK_PIO |
                        CS4231_RECORD_ENABLE |
                        CS4231_RECORD_PIO |
                        CS4231_CALIB_MODE);
    chip->image[CS4231_IFACE_CTRL] |= CS4231_AUTOCALIB;
    snd_cs4231_out(chip, CS4231_IFACE_CTRL, chip->image[CS4231_IFACE_CTRL]);
    spin_unlock_irqrestore(&chip->lock, flags);
    snd_cs4231_mce_down(chip);

#ifdef SNDRV_DEBUG_MCE
    snd_printdd("init: (2)\n");
#endif

    snd_cs4231_mce_up(chip);
    spin_lock_irqsave(&chip->lock, flags);
    snd_cs4231_out(chip, CS4231_ALT_FEATURE_1,
            chip->image[CS4231_ALT_FEATURE_1]);
    spin_unlock_irqrestore(&chip->lock, flags);
    snd_cs4231_mce_down(chip);

#ifdef SNDRV_DEBUG_MCE
    snd_printdd("init: (3) - afei = 0x%x\n",
            chip->image[CS4231_ALT_FEATURE_1]);
#endif

    spin_lock_irqsave(&chip->lock, flags);
    snd_cs4231_out(chip, CS4231_ALT_FEATURE_2,
            chip->image[CS4231_ALT_FEATURE_2]);
    spin_unlock_irqrestore(&chip->lock, flags);

    snd_cs4231_mce_up(chip);
    spin_lock_irqsave(&chip->lock, flags);
    snd_cs4231_out(chip, CS4231_PLAYBK_FORMAT,
            chip->image[CS4231_PLAYBK_FORMAT]);
    spin_unlock_irqrestore(&chip->lock, flags);
    snd_cs4231_mce_down(chip);

#ifdef SNDRV_DEBUG_MCE
    snd_printdd("init: (4)\n");
#endif

    snd_cs4231_mce_up(chip);
    spin_lock_irqsave(&chip->lock, flags);
    snd_cs4231_out(chip, CS4231_REC_FORMAT, chip->image[CS4231_REC_FORMAT]);
    spin_unlock_irqrestore(&chip->lock, flags);
    snd_cs4231_mce_down(chip);

#ifdef SNDRV_DEBUG_MCE
    snd_printdd("init: (5)\n");
#endif
}

static int snd_cs4231_open(struct snd_cs4231 *chip, unsigned int mode)
{
    unsigned long flags;

    mutex_lock(&chip->open_mutex);
    if ((chip->mode & mode)) {
        mutex_unlock(&chip->open_mutex);
        return -EAGAIN;
    }
    if (chip->mode & CS4231_MODE_OPEN) {
        chip->mode |= mode;
        mutex_unlock(&chip->open_mutex);
        return 0;
    }
    /* ok. now enable and ack CODEC IRQ */
    spin_lock_irqsave(&chip->lock, flags);
    snd_cs4231_out(chip, CS4231_IRQ_STATUS, CS4231_PLAYBACK_IRQ |
               CS4231_RECORD_IRQ |
               CS4231_TIMER_IRQ);
    snd_cs4231_out(chip, CS4231_IRQ_STATUS, 0);
    __cs4231_writeb(chip, 0, CS4231U(chip, STATUS));    /* clear IRQ */
    __cs4231_writeb(chip, 0, CS4231U(chip, STATUS));    /* clear IRQ */

    snd_cs4231_out(chip, CS4231_IRQ_STATUS, CS4231_PLAYBACK_IRQ |
               CS4231_RECORD_IRQ |
               CS4231_TIMER_IRQ);
    snd_cs4231_out(chip, CS4231_IRQ_STATUS, 0);

    spin_unlock_irqrestore(&chip->lock, flags);

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

static void snd_cs4231_close(struct snd_cs4231 *chip, unsigned int mode)
{
    unsigned long flags;

    mutex_lock(&chip->open_mutex);
    chip->mode &= ~mode;
    if (chip->mode & CS4231_MODE_OPEN) {
        mutex_unlock(&chip->open_mutex);
        return;
    }
    snd_cs4231_calibrate_mute(chip, 1);

    /* disable IRQ */
    spin_lock_irqsave(&chip->lock, flags);
    snd_cs4231_out(chip, CS4231_IRQ_STATUS, 0);
    __cs4231_writeb(chip, 0, CS4231U(chip, STATUS));    /* clear IRQ */
    __cs4231_writeb(chip, 0, CS4231U(chip, STATUS));    /* clear IRQ */

    /* now disable record & playback */

    if (chip->image[CS4231_IFACE_CTRL] &
        (CS4231_PLAYBACK_ENABLE | CS4231_PLAYBACK_PIO |
         CS4231_RECORD_ENABLE | CS4231_RECORD_PIO)) {
        spin_unlock_irqrestore(&chip->lock, flags);
        snd_cs4231_mce_up(chip);
        spin_lock_irqsave(&chip->lock, flags);
        chip->image[CS4231_IFACE_CTRL] &=
            ~(CS4231_PLAYBACK_ENABLE | CS4231_PLAYBACK_PIO |
              CS4231_RECORD_ENABLE | CS4231_RECORD_PIO);
        snd_cs4231_out(chip, CS4231_IFACE_CTRL,
                chip->image[CS4231_IFACE_CTRL]);
        spin_unlock_irqrestore(&chip->lock, flags);
        snd_cs4231_mce_down(chip);
        spin_lock_irqsave(&chip->lock, flags);
    }

    /* clear IRQ again */
    snd_cs4231_out(chip, CS4231_IRQ_STATUS, 0);
    __cs4231_writeb(chip, 0, CS4231U(chip, STATUS));    /* clear IRQ */
    __cs4231_writeb(chip, 0, CS4231U(chip, STATUS));    /* clear IRQ */
    spin_unlock_irqrestore(&chip->lock, flags);

    snd_cs4231_calibrate_mute(chip, 0);

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

/*
 *  timer open/close
 */

static int snd_cs4231_timer_open(struct snd_timer *timer)
{
    struct snd_cs4231 *chip = snd_timer_chip(timer);
    snd_cs4231_open(chip, CS4231_MODE_TIMER);
    return 0;
}

static int snd_cs4231_timer_close(struct snd_timer *timer)
{
    struct snd_cs4231 *chip = snd_timer_chip(timer);
    snd_cs4231_close(chip, CS4231_MODE_TIMER);
    return 0;
}

static struct snd_timer_hardware snd_cs4231_timer_table = {
    .flags      =   SNDRV_TIMER_HW_AUTO,
    .resolution =   9945,
    .ticks      =   65535,
    .open       =   snd_cs4231_timer_open,
    .close      =   snd_cs4231_timer_close,
    .c_resolution   =   snd_cs4231_timer_resolution,
    .start      =   snd_cs4231_timer_start,
    .stop       =   snd_cs4231_timer_stop,
};

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

static int snd_cs4231_playback_hw_params(struct snd_pcm_substream *substream,
                     struct snd_pcm_hw_params *hw_params)
{
    struct snd_cs4231 *chip = snd_pcm_substream_chip(substream);
    unsigned char new_pdfr;
    int err;

    err = snd_pcm_lib_malloc_pages(substream,
                    params_buffer_bytes(hw_params));
    if (err < 0)
        return err;
    new_pdfr = snd_cs4231_get_format(chip, params_format(hw_params),
                     params_channels(hw_params)) |
        snd_cs4231_get_rate(params_rate(hw_params));
    snd_cs4231_playback_format(chip, hw_params, new_pdfr);

    return 0;
}

static int snd_cs4231_playback_prepare(struct snd_pcm_substream *substream)
{
    struct snd_cs4231 *chip = snd_pcm_substream_chip(substream);
    struct snd_pcm_runtime *runtime = substream->runtime;
    unsigned long flags;

    spin_lock_irqsave(&chip->lock, flags);

    chip->image[CS4231_IFACE_CTRL] &= ~(CS4231_PLAYBACK_ENABLE |
                        CS4231_PLAYBACK_PIO);

    BUG_ON(runtime->period_size > 0xffff + 1);

    chip->p_periods_sent = 0;
    spin_unlock_irqrestore(&chip->lock, flags);

    return 0;
}

static int snd_cs4231_capture_hw_params(struct snd_pcm_substream *substream,
                    struct snd_pcm_hw_params *hw_params)
{
    struct snd_cs4231 *chip = snd_pcm_substream_chip(substream);
    unsigned char new_cdfr;
    int err;

    err = snd_pcm_lib_malloc_pages(substream,
                    params_buffer_bytes(hw_params));
    if (err < 0)
        return err;
    new_cdfr = snd_cs4231_get_format(chip, params_format(hw_params),
                     params_channels(hw_params)) |
        snd_cs4231_get_rate(params_rate(hw_params));
    snd_cs4231_capture_format(chip, hw_params, new_cdfr);

    return 0;
}

static int snd_cs4231_capture_prepare(struct snd_pcm_substream *substream)
{
    struct snd_cs4231 *chip = snd_pcm_substream_chip(substream);
    unsigned long flags;

    spin_lock_irqsave(&chip->lock, flags);
    chip->image[CS4231_IFACE_CTRL] &= ~(CS4231_RECORD_ENABLE |
                        CS4231_RECORD_PIO);


    chip->c_periods_sent = 0;
    spin_unlock_irqrestore(&chip->lock, flags);

    return 0;
}

static void snd_cs4231_overrange(struct snd_cs4231 *chip)
{
    unsigned long flags;
    unsigned char res;

    spin_lock_irqsave(&chip->lock, flags);
    res = snd_cs4231_in(chip, CS4231_TEST_INIT);
    spin_unlock_irqrestore(&chip->lock, flags);

    /* detect overrange only above 0dB; may be user selectable? */
    if (res & (0x08 | 0x02))
        chip->capture_substream->runtime->overrange++;
}

static void snd_cs4231_play_callback(struct snd_cs4231 *chip)
{
    if (chip->image[CS4231_IFACE_CTRL] & CS4231_PLAYBACK_ENABLE) {
        snd_pcm_period_elapsed(chip->playback_substream);
        snd_cs4231_advance_dma(&chip->p_dma, chip->playback_substream,
                        &chip->p_periods_sent);
    }
}

static void snd_cs4231_capture_callback(struct snd_cs4231 *chip)
{
    if (chip->image[CS4231_IFACE_CTRL] & CS4231_RECORD_ENABLE) {
        snd_pcm_period_elapsed(chip->capture_substream);
        snd_cs4231_advance_dma(&chip->c_dma, chip->capture_substream,
                        &chip->c_periods_sent);
    }
}

static snd_pcm_uframes_t snd_cs4231_playback_pointer(
                    struct snd_pcm_substream *substream)
{
    struct snd_cs4231 *chip = snd_pcm_substream_chip(substream);
    struct cs4231_dma_control *dma_cont = &chip->p_dma;
    size_t ptr;

    if (!(chip->image[CS4231_IFACE_CTRL] & CS4231_PLAYBACK_ENABLE))
        return 0;
    ptr = dma_cont->address(dma_cont);
    if (ptr != 0)
        ptr -= substream->runtime->dma_addr;

    return bytes_to_frames(substream->runtime, ptr);
}

static snd_pcm_uframes_t snd_cs4231_capture_pointer(
                    struct snd_pcm_substream *substream)
{
    struct snd_cs4231 *chip = snd_pcm_substream_chip(substream);
    struct cs4231_dma_control *dma_cont = &chip->c_dma;
    size_t ptr;

    if (!(chip->image[CS4231_IFACE_CTRL] & CS4231_RECORD_ENABLE))
        return 0;
    ptr = dma_cont->address(dma_cont);
    if (ptr != 0)
        ptr -= substream->runtime->dma_addr;

    return bytes_to_frames(substream->runtime, ptr);
}

static int __devinit snd_cs4231_probe(struct snd_cs4231 *chip)
{
    unsigned long flags;
    int i;
    int id = 0;
    int vers = 0;
    unsigned char *ptr;

    for (i = 0; i < 50; i++) {
        mb();
        if (__cs4231_readb(chip, CS4231U(chip, REGSEL)) & CS4231_INIT)
            msleep(2);
        else {
            spin_lock_irqsave(&chip->lock, flags);
            snd_cs4231_out(chip, CS4231_MISC_INFO, CS4231_MODE2);
            id = snd_cs4231_in(chip, CS4231_MISC_INFO) & 0x0f;
            vers = snd_cs4231_in(chip, CS4231_VERSION);
            spin_unlock_irqrestore(&chip->lock, flags);
            if (id == 0x0a)
                break;  /* this is valid value */
        }
    }
    snd_printdd("cs4231: port = %p, id = 0x%x\n", chip->port, id);
    if (id != 0x0a)
        return -ENODEV; /* no valid device found */

    spin_lock_irqsave(&chip->lock, flags);

    /* clear any pendings IRQ */
    __cs4231_readb(chip, CS4231U(chip, STATUS));
    __cs4231_writeb(chip, 0, CS4231U(chip, STATUS));
    mb();

    spin_unlock_irqrestore(&chip->lock, flags);

    chip->image[CS4231_MISC_INFO] = CS4231_MODE2;
    chip->image[CS4231_IFACE_CTRL] =
        chip->image[CS4231_IFACE_CTRL] & ~CS4231_SINGLE_DMA;
    chip->image[CS4231_ALT_FEATURE_1] = 0x80;
    chip->image[CS4231_ALT_FEATURE_2] = 0x01;
    if (vers & 0x20)
        chip->image[CS4231_ALT_FEATURE_2] |= 0x02;

    ptr = (unsigned char *) &chip->image;

    snd_cs4231_mce_down(chip);

    spin_lock_irqsave(&chip->lock, flags);

    for (i = 0; i < 32; i++)    /* ok.. fill all CS4231 registers */
        snd_cs4231_out(chip, i, *ptr++);

    spin_unlock_irqrestore(&chip->lock, flags);

    snd_cs4231_mce_up(chip);

    snd_cs4231_mce_down(chip);

    mdelay(2);

    return 0;       /* all things are ok.. */
}

static struct snd_pcm_hardware snd_cs4231_playback = {
    .info           = SNDRV_PCM_INFO_MMAP |
                  SNDRV_PCM_INFO_INTERLEAVED |
                  SNDRV_PCM_INFO_MMAP_VALID |
                  SNDRV_PCM_INFO_SYNC_START,
    .formats        = SNDRV_PCM_FMTBIT_MU_LAW |
                  SNDRV_PCM_FMTBIT_A_LAW |
                  SNDRV_PCM_FMTBIT_IMA_ADPCM |
                  SNDRV_PCM_FMTBIT_U8 |
                  SNDRV_PCM_FMTBIT_S16_LE |
                  SNDRV_PCM_FMTBIT_S16_BE,
    .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   = 32 * 1024,
    .period_bytes_min   = 64,
    .period_bytes_max   = 32 * 1024,
    .periods_min        = 1,
    .periods_max        = 1024,
};

static struct snd_pcm_hardware snd_cs4231_capture = {
    .info           = SNDRV_PCM_INFO_MMAP |
                  SNDRV_PCM_INFO_INTERLEAVED |
                  SNDRV_PCM_INFO_MMAP_VALID |
                  SNDRV_PCM_INFO_SYNC_START,
    .formats        = SNDRV_PCM_FMTBIT_MU_LAW |
                  SNDRV_PCM_FMTBIT_A_LAW |
                  SNDRV_PCM_FMTBIT_IMA_ADPCM |
                  SNDRV_PCM_FMTBIT_U8 |
                  SNDRV_PCM_FMTBIT_S16_LE |
                  SNDRV_PCM_FMTBIT_S16_BE,
    .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   = 32 * 1024,
    .period_bytes_min   = 64,
    .period_bytes_max   = 32 * 1024,
    .periods_min        = 1,
    .periods_max        = 1024,
};

static int snd_cs4231_playback_open(struct snd_pcm_substream *substream)
{
    struct snd_cs4231 *chip = snd_pcm_substream_chip(substream);
    struct snd_pcm_runtime *runtime = substream->runtime;
    int err;

    runtime->hw = snd_cs4231_playback;

    err = snd_cs4231_open(chip, CS4231_MODE_PLAY);
    if (err < 0) {
        snd_free_pages(runtime->dma_area, runtime->dma_bytes);
        return err;
    }
    chip->playback_substream = substream;
    chip->p_periods_sent = 0;
    snd_pcm_set_sync(substream);
    snd_cs4231_xrate(runtime);

    return 0;
}

static int snd_cs4231_capture_open(struct snd_pcm_substream *substream)
{
    struct snd_cs4231 *chip = snd_pcm_substream_chip(substream);
    struct snd_pcm_runtime *runtime = substream->runtime;
    int err;

    runtime->hw = snd_cs4231_capture;

    err = snd_cs4231_open(chip, CS4231_MODE_RECORD);
    if (err < 0) {
        snd_free_pages(runtime->dma_area, runtime->dma_bytes);
        return err;
    }
    chip->capture_substream = substream;
    chip->c_periods_sent = 0;
    snd_pcm_set_sync(substream);
    snd_cs4231_xrate(runtime);

    return 0;
}

static int snd_cs4231_playback_close(struct snd_pcm_substream *substream)
{
    struct snd_cs4231 *chip = snd_pcm_substream_chip(substream);

    snd_cs4231_close(chip, CS4231_MODE_PLAY);
    chip->playback_substream = NULL;

    return 0;
}

static int snd_cs4231_capture_close(struct snd_pcm_substream *substream)
{
    struct snd_cs4231 *chip = snd_pcm_substream_chip(substream);

    snd_cs4231_close(chip, CS4231_MODE_RECORD);
    chip->capture_substream = NULL;

    return 0;
}

/* XXX We can do some power-management, in particular on EBUS using
 * XXX the audio AUXIO register...
 */

static struct snd_pcm_ops snd_cs4231_playback_ops = {
    .open       =   snd_cs4231_playback_open,
    .close      =   snd_cs4231_playback_close,
    .ioctl      =   snd_pcm_lib_ioctl,
    .hw_params  =   snd_cs4231_playback_hw_params,
    .hw_free    =   snd_pcm_lib_free_pages,
    .prepare    =   snd_cs4231_playback_prepare,
    .trigger    =   snd_cs4231_trigger,
    .pointer    =   snd_cs4231_playback_pointer,
};

static struct snd_pcm_ops snd_cs4231_capture_ops = {
    .open       =   snd_cs4231_capture_open,
    .close      =   snd_cs4231_capture_close,
    .ioctl      =   snd_pcm_lib_ioctl,
    .hw_params  =   snd_cs4231_capture_hw_params,
    .hw_free    =   snd_pcm_lib_free_pages,
    .prepare    =   snd_cs4231_capture_prepare,
    .trigger    =   snd_cs4231_trigger,
    .pointer    =   snd_cs4231_capture_pointer,
};

static int __devinit snd_cs4231_pcm(struct snd_card *card)
{
    struct snd_cs4231 *chip = card->private_data;
    struct snd_pcm *pcm;
    int err;

    err = snd_pcm_new(card, "CS4231", 0, 1, 1, &pcm);
    if (err < 0)
        return err;

    snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
            &snd_cs4231_playback_ops);
    snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
            &snd_cs4231_capture_ops);

    /* global setup */
    pcm->private_data = chip;
    pcm->info_flags = SNDRV_PCM_INFO_JOINT_DUPLEX;
    strcpy(pcm->name, "CS4231");

    snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
                          &chip->op->dev,
                          64 * 1024, 128 * 1024);

    chip->pcm = pcm;

    return 0;
}

static int __devinit snd_cs4231_timer(struct snd_card *card)
{
    struct snd_cs4231 *chip = card->private_data;
    struct snd_timer *timer;
    struct snd_timer_id tid;
    int err;

    /* Timer initialization */
    tid.dev_class = SNDRV_TIMER_CLASS_CARD;
    tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
    tid.card = card->number;
    tid.device = 0;
    tid.subdevice = 0;
    err = snd_timer_new(card, "CS4231", &tid, &timer);
    if (err < 0)
        return err;
    strcpy(timer->name, "CS4231");
    timer->private_data = chip;
    timer->hw = snd_cs4231_timer_table;
    chip->timer = timer;

    return 0;
}

/*
 *  MIXER part
 */

static int snd_cs4231_info_mux(struct snd_kcontrol *kcontrol,
                   struct snd_ctl_elem_info *uinfo)
{
    static char *texts[4] = {
        "Line", "CD", "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_cs4231_get_mux(struct snd_kcontrol *kcontrol,
                  struct snd_ctl_elem_value *ucontrol)
{
    struct snd_cs4231 *chip = snd_kcontrol_chip(kcontrol);
    unsigned long flags;

    spin_lock_irqsave(&chip->lock, flags);
    ucontrol->value.enumerated.item[0] =
        (chip->image[CS4231_LEFT_INPUT] & CS4231_MIXS_ALL) >> 6;
    ucontrol->value.enumerated.item[1] =
        (chip->image[CS4231_RIGHT_INPUT] & CS4231_MIXS_ALL) >> 6;
    spin_unlock_irqrestore(&chip->lock, flags);

    return 0;
}

static int snd_cs4231_put_mux(struct snd_kcontrol *kcontrol,
                  struct snd_ctl_elem_value *ucontrol)
{
    struct snd_cs4231 *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->lock, flags);

    left = (chip->image[CS4231_LEFT_INPUT] & ~CS4231_MIXS_ALL) | left;
    right = (chip->image[CS4231_RIGHT_INPUT] & ~CS4231_MIXS_ALL) | right;
    change = left != chip->image[CS4231_LEFT_INPUT] ||
         right != chip->image[CS4231_RIGHT_INPUT];
    snd_cs4231_out(chip, CS4231_LEFT_INPUT, left);
    snd_cs4231_out(chip, CS4231_RIGHT_INPUT, right);

    spin_unlock_irqrestore(&chip->lock, flags);

    return change;
}

static int snd_cs4231_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_cs4231_get_single(struct snd_kcontrol *kcontrol,
                 struct snd_ctl_elem_value *ucontrol)
{
    struct snd_cs4231 *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->lock, flags);

    ucontrol->value.integer.value[0] = (chip->image[reg] >> shift) & mask;

    spin_unlock_irqrestore(&chip->lock, flags);

    if (invert)
        ucontrol->value.integer.value[0] =
            (mask - ucontrol->value.integer.value[0]);

    return 0;
}

static int snd_cs4231_put_single(struct snd_kcontrol *kcontrol,
                 struct snd_ctl_elem_value *ucontrol)
{
    struct snd_cs4231 *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->lock, flags);

    val = (chip->image[reg] & ~(mask << shift)) | val;
    change = val != chip->image[reg];
    snd_cs4231_out(chip, reg, val);

    spin_unlock_irqrestore(&chip->lock, flags);

    return change;
}

static int snd_cs4231_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_cs4231_get_double(struct snd_kcontrol *kcontrol,
                 struct snd_ctl_elem_value *ucontrol)
{
    struct snd_cs4231 *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->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->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_cs4231_put_double(struct snd_kcontrol *kcontrol,
                 struct snd_ctl_elem_value *ucontrol)
{
    struct snd_cs4231 *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->lock, flags);

    val1 = (chip->image[left_reg] & ~(mask << shift_left)) | val1;
    val2 = (chip->image[right_reg] & ~(mask << shift_right)) | val2;
    change = val1 != chip->image[left_reg];
    change |= val2 != chip->image[right_reg];
    snd_cs4231_out(chip, left_reg, val1);
    snd_cs4231_out(chip, right_reg, val2);

    spin_unlock_irqrestore(&chip->lock, flags);

    return change;
}

#define CS4231_SINGLE(xname, xindex, reg, shift, mask, invert) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = (xname), .index = (xindex), \
  .info = snd_cs4231_info_single,   \
  .get = snd_cs4231_get_single, .put = snd_cs4231_put_single,   \
  .private_value = (reg) | ((shift) << 8) | ((mask) << 16) | ((invert) << 24) }

#define CS4231_DOUBLE(xname, xindex, left_reg, right_reg, shift_left, \
            shift_right, mask, invert) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = (xname), .index = (xindex), \
  .info = snd_cs4231_info_double,   \
  .get = snd_cs4231_get_double, .put = snd_cs4231_put_double,   \
  .private_value = (left_reg) | ((right_reg) << 8) | ((shift_left) << 16) | \
           ((shift_right) << 19) | ((mask) << 24) | ((invert) << 22) }

static struct snd_kcontrol_new snd_cs4231_controls[] __devinitdata = {
CS4231_DOUBLE("PCM Playback Switch", 0, CS4231_LEFT_OUTPUT,
        CS4231_RIGHT_OUTPUT, 7, 7, 1, 1),
CS4231_DOUBLE("PCM Playback Volume", 0, CS4231_LEFT_OUTPUT,
        CS4231_RIGHT_OUTPUT, 0, 0, 63, 1),
CS4231_DOUBLE("Line Playback Switch", 0, CS4231_LEFT_LINE_IN,
        CS4231_RIGHT_LINE_IN, 7, 7, 1, 1),
CS4231_DOUBLE("Line Playback Volume", 0, CS4231_LEFT_LINE_IN,
        CS4231_RIGHT_LINE_IN, 0, 0, 31, 1),
CS4231_DOUBLE("Aux Playback Switch", 0, CS4231_AUX1_LEFT_INPUT,
        CS4231_AUX1_RIGHT_INPUT, 7, 7, 1, 1),
CS4231_DOUBLE("Aux Playback Volume", 0, CS4231_AUX1_LEFT_INPUT,
        CS4231_AUX1_RIGHT_INPUT, 0, 0, 31, 1),
CS4231_DOUBLE("Aux Playback Switch", 1, CS4231_AUX2_LEFT_INPUT,
        CS4231_AUX2_RIGHT_INPUT, 7, 7, 1, 1),
CS4231_DOUBLE("Aux Playback Volume", 1, CS4231_AUX2_LEFT_INPUT,
        CS4231_AUX2_RIGHT_INPUT, 0, 0, 31, 1),
CS4231_SINGLE("Mono Playback Switch", 0, CS4231_MONO_CTRL, 7, 1, 1),
CS4231_SINGLE("Mono Playback Volume", 0, CS4231_MONO_CTRL, 0, 15, 1),
CS4231_SINGLE("Mono Output Playback Switch", 0, CS4231_MONO_CTRL, 6, 1, 1),
CS4231_SINGLE("Mono Output Playback Bypass", 0, CS4231_MONO_CTRL, 5, 1, 0),
CS4231_DOUBLE("Capture Volume", 0, CS4231_LEFT_INPUT, CS4231_RIGHT_INPUT, 0, 0,
        15, 0),
{
    .iface  = SNDRV_CTL_ELEM_IFACE_MIXER,
    .name   = "Capture Source",
    .info   = snd_cs4231_info_mux,
    .get    = snd_cs4231_get_mux,
    .put    = snd_cs4231_put_mux,
},
CS4231_DOUBLE("Mic Boost", 0, CS4231_LEFT_INPUT, CS4231_RIGHT_INPUT, 5, 5,
        1, 0),
CS4231_SINGLE("Loopback Capture Switch", 0, CS4231_LOOPBACK, 0, 1, 0),
CS4231_SINGLE("Loopback Capture Volume", 0, CS4231_LOOPBACK, 2, 63, 1),
/* SPARC specific uses of XCTL{0,1} general purpose outputs.  */
CS4231_SINGLE("Line Out Switch", 0, CS4231_PIN_CTRL, 6, 1, 1),
CS4231_SINGLE("Headphone Out Switch", 0, CS4231_PIN_CTRL, 7, 1, 1)
};

static int __devinit snd_cs4231_mixer(struct snd_card *card)
{
    struct snd_cs4231 *chip = card->private_data;
    int err, idx;

    if (snd_BUG_ON(!chip || !chip->pcm))
        return -EINVAL;

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

    for (idx = 0; idx < ARRAY_SIZE(snd_cs4231_controls); idx++) {
        err = snd_ctl_add(card,
                 snd_ctl_new1(&snd_cs4231_controls[idx], chip));
        if (err < 0)
            return err;
    }
    return 0;
}

static int dev;

static int __devinit cs4231_attach_begin(struct snd_card **rcard)
{
    struct snd_card *card;
    struct snd_cs4231 *chip;
    int err;

    *rcard = NULL;

    if (dev >= SNDRV_CARDS)
        return -ENODEV;

    if (!enable[dev]) {
        dev++;
        return -ENOENT;
    }

    err = snd_card_create(index[dev], id[dev], THIS_MODULE,
                  sizeof(struct snd_cs4231), &card);
    if (err < 0)
        return err;

    strcpy(card->driver, "CS4231");
    strcpy(card->shortname, "Sun CS4231");

    chip = card->private_data;
    chip->card = card;

    *rcard = card;
    return 0;
}

static int __devinit cs4231_attach_finish(struct snd_card *card)
{
    struct snd_cs4231 *chip = card->private_data;
    int err;

    err = snd_cs4231_pcm(card);
    if (err < 0)
        goto out_err;

    err = snd_cs4231_mixer(card);
    if (err < 0)
        goto out_err;

    err = snd_cs4231_timer(card);
    if (err < 0)
        goto out_err;

    err = snd_card_register(card);
    if (err < 0)
        goto out_err;

    dev_set_drvdata(&chip->op->dev, chip);

    dev++;
    return 0;

out_err:
    snd_card_free(card);
    return err;
}

#ifdef SBUS_SUPPORT

static irqreturn_t snd_cs4231_sbus_interrupt(int irq, void *dev_id)
{
    unsigned long flags;
    unsigned char status;
    u32 csr;
    struct snd_cs4231 *chip = dev_id;

    /*This is IRQ is not raised by the cs4231*/
    if (!(__cs4231_readb(chip, CS4231U(chip, STATUS)) & CS4231_GLOBALIRQ))
        return IRQ_NONE;

    /* ACK the APC interrupt. */
    csr = sbus_readl(chip->port + APCCSR);

    sbus_writel(csr, chip->port + APCCSR);

    if ((csr & APC_PDMA_READY) &&
        (csr & APC_PLAY_INT) &&
        (csr & APC_XINT_PNVA) &&
        !(csr & APC_XINT_EMPT))
            snd_cs4231_play_callback(chip);

    if ((csr & APC_CDMA_READY) &&
        (csr & APC_CAPT_INT) &&
        (csr & APC_XINT_CNVA) &&
        !(csr & APC_XINT_EMPT))
            snd_cs4231_capture_callback(chip);

    status = snd_cs4231_in(chip, CS4231_IRQ_STATUS);

    if (status & CS4231_TIMER_IRQ) {
        if (chip->timer)
            snd_timer_interrupt(chip->timer, chip->timer->sticks);
    }

    if ((status & CS4231_RECORD_IRQ) && (csr & APC_CDMA_READY))
        snd_cs4231_overrange(chip);

    /* ACK the CS4231 interrupt. */
    spin_lock_irqsave(&chip->lock, flags);
    snd_cs4231_outm(chip, CS4231_IRQ_STATUS, ~CS4231_ALL_IRQS | ~status, 0);
    spin_unlock_irqrestore(&chip->lock, flags);

    return IRQ_HANDLED;
}

/*
 * SBUS DMA routines
 */

static int sbus_dma_request(struct cs4231_dma_control *dma_cont,
                dma_addr_t bus_addr, size_t len)
{
    unsigned long flags;
    u32 test, csr;
    int err;
    struct sbus_dma_info *base = &dma_cont->sbus_info;

    if (len >= (1 << 24))
        return -EINVAL;
    spin_lock_irqsave(&base->lock, flags);
    csr = sbus_readl(base->regs + APCCSR);
    err = -EINVAL;
    test = APC_CDMA_READY;
    if (base->dir == APC_PLAY)
        test = APC_PDMA_READY;
    if (!(csr & test))
        goto out;
    err = -EBUSY;
    test = APC_XINT_CNVA;
    if (base->dir == APC_PLAY)
        test = APC_XINT_PNVA;
    if (!(csr & test))
        goto out;
    err = 0;
    sbus_writel(bus_addr, base->regs + base->dir + APCNVA);
    sbus_writel(len, base->regs + base->dir + APCNC);
out:
    spin_unlock_irqrestore(&base->lock, flags);
    return err;
}

static void sbus_dma_prepare(struct cs4231_dma_control *dma_cont, int d)
{
    unsigned long flags;
    u32 csr, test;
    struct sbus_dma_info *base = &dma_cont->sbus_info;

    spin_lock_irqsave(&base->lock, flags);
    csr = sbus_readl(base->regs + APCCSR);
    test =  APC_GENL_INT | APC_PLAY_INT | APC_XINT_ENA |
        APC_XINT_PLAY | APC_XINT_PEMP | APC_XINT_GENL |
         APC_XINT_PENA;
    if (base->dir == APC_RECORD)
        test = APC_GENL_INT | APC_CAPT_INT | APC_XINT_ENA |
            APC_XINT_CAPT | APC_XINT_CEMP | APC_XINT_GENL;
    csr |= test;
    sbus_writel(csr, base->regs + APCCSR);
    spin_unlock_irqrestore(&base->lock, flags);
}

static void sbus_dma_enable(struct cs4231_dma_control *dma_cont, int on)
{
    unsigned long flags;
    u32 csr, shift;
    struct sbus_dma_info *base = &dma_cont->sbus_info;

    spin_lock_irqsave(&base->lock, flags);
    if (!on) {
        sbus_writel(0, base->regs + base->dir + APCNC);
        sbus_writel(0, base->regs + base->dir + APCNVA);
        if (base->dir == APC_PLAY) {
            sbus_writel(0, base->regs + base->dir + APCC);
            sbus_writel(0, base->regs + base->dir + APCVA);
        }

        udelay(1200);
    }
    csr = sbus_readl(base->regs + APCCSR);
    shift = 0;
    if (base->dir == APC_PLAY)
        shift = 1;
    if (on)
        csr &= ~(APC_CPAUSE << shift);
    else
        csr |= (APC_CPAUSE << shift);
    sbus_writel(csr, base->regs + APCCSR);
    if (on)
        csr |= (APC_CDMA_READY << shift);
    else
        csr &= ~(APC_CDMA_READY << shift);
    sbus_writel(csr, base->regs + APCCSR);

    spin_unlock_irqrestore(&base->lock, flags);
}

static unsigned int sbus_dma_addr(struct cs4231_dma_control *dma_cont)
{
    struct sbus_dma_info *base = &dma_cont->sbus_info;

    return sbus_readl(base->regs + base->dir + APCVA);
}

/*
 * Init and exit routines
 */

static int snd_cs4231_sbus_free(struct snd_cs4231 *chip)
{
    struct platform_device *op = chip->op;

    if (chip->irq[0])
        free_irq(chip->irq[0], chip);

    if (chip->port)
        of_iounmap(&op->resource[0], chip->port, chip->regs_size);

    return 0;
}

static int snd_cs4231_sbus_dev_free(struct snd_device *device)
{
    struct snd_cs4231 *cp = device->device_data;

    return snd_cs4231_sbus_free(cp);
}

static struct snd_device_ops snd_cs4231_sbus_dev_ops = {
    .dev_free   =   snd_cs4231_sbus_dev_free,
};

static int __devinit snd_cs4231_sbus_create(struct snd_card *card,
                        struct platform_device *op,
                        int dev)
{
    struct snd_cs4231 *chip = card->private_data;
    int err;

    spin_lock_init(&chip->lock);
    spin_lock_init(&chip->c_dma.sbus_info.lock);
    spin_lock_init(&chip->p_dma.sbus_info.lock);
    mutex_init(&chip->mce_mutex);
    mutex_init(&chip->open_mutex);
    chip->op = op;
    chip->regs_size = resource_size(&op->resource[0]);
    memcpy(&chip->image, &snd_cs4231_original_image,
           sizeof(snd_cs4231_original_image));

    chip->port = of_ioremap(&op->resource[0], 0,
                chip->regs_size, "cs4231");
    if (!chip->port) {
        snd_printdd("cs4231-%d: Unable to map chip registers.\n", dev);
        return -EIO;
    }

    chip->c_dma.sbus_info.regs = chip->port;
    chip->p_dma.sbus_info.regs = chip->port;
    chip->c_dma.sbus_info.dir = APC_RECORD;
    chip->p_dma.sbus_info.dir = APC_PLAY;

    chip->p_dma.prepare = sbus_dma_prepare;
    chip->p_dma.enable = sbus_dma_enable;
    chip->p_dma.request = sbus_dma_request;
    chip->p_dma.address = sbus_dma_addr;

    chip->c_dma.prepare = sbus_dma_prepare;
    chip->c_dma.enable = sbus_dma_enable;
    chip->c_dma.request = sbus_dma_request;
    chip->c_dma.address = sbus_dma_addr;

    if (request_irq(op->archdata.irqs[0], snd_cs4231_sbus_interrupt,
            IRQF_SHARED, "cs4231", chip)) {
        snd_printdd("cs4231-%d: Unable to grab SBUS IRQ %d\n",
                dev, op->archdata.irqs[0]);
        snd_cs4231_sbus_free(chip);
        return -EBUSY;
    }
    chip->irq[0] = op->archdata.irqs[0];

    if (snd_cs4231_probe(chip) < 0) {
        snd_cs4231_sbus_free(chip);
        return -ENODEV;
    }
    snd_cs4231_init(chip);

    if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL,
                  chip, &snd_cs4231_sbus_dev_ops)) < 0) {
        snd_cs4231_sbus_free(chip);
        return err;
    }

    return 0;
}

static int __devinit cs4231_sbus_probe(struct platform_device *op)
{
    struct resource *rp = &op->resource[0];
    struct snd_card *card;
    int err;

    err = cs4231_attach_begin(&card);
    if (err)
        return err;

    sprintf(card->longname, "%s at 0x%02lx:0x%016Lx, irq %d",
        card->shortname,
        rp->flags & 0xffL,
        (unsigned long long)rp->start,
        op->archdata.irqs[0]);

    err = snd_cs4231_sbus_create(card, op, dev);
    if (err < 0) {
        snd_card_free(card);
        return err;
    }

    return cs4231_attach_finish(card);
}
#endif

#ifdef EBUS_SUPPORT

static void snd_cs4231_ebus_play_callback(struct ebus_dma_info *p, int event,
                      void *cookie)
{
    struct snd_cs4231 *chip = cookie;

    snd_cs4231_play_callback(chip);
}

static void snd_cs4231_ebus_capture_callback(struct ebus_dma_info *p,
                         int event, void *cookie)
{
    struct snd_cs4231 *chip = cookie;

    snd_cs4231_capture_callback(chip);
}

/*
 * EBUS DMA wrappers
 */

static int _ebus_dma_request(struct cs4231_dma_control *dma_cont,
                 dma_addr_t bus_addr, size_t len)
{
    return ebus_dma_request(&dma_cont->ebus_info, bus_addr, len);
}

static void _ebus_dma_enable(struct cs4231_dma_control *dma_cont, int on)
{
    ebus_dma_enable(&dma_cont->ebus_info, on);
}

static void _ebus_dma_prepare(struct cs4231_dma_control *dma_cont, int dir)
{
    ebus_dma_prepare(&dma_cont->ebus_info, dir);
}

static unsigned int _ebus_dma_addr(struct cs4231_dma_control *dma_cont)
{
    return ebus_dma_addr(&dma_cont->ebus_info);
}

/*
 * Init and exit routines
 */

static int snd_cs4231_ebus_free(struct snd_cs4231 *chip)
{
    struct platform_device *op = chip->op;

    if (chip->c_dma.ebus_info.regs) {
        ebus_dma_unregister(&chip->c_dma.ebus_info);
        of_iounmap(&op->resource[2], chip->c_dma.ebus_info.regs, 0x10);
    }
    if (chip->p_dma.ebus_info.regs) {
        ebus_dma_unregister(&chip->p_dma.ebus_info);
        of_iounmap(&op->resource[1], chip->p_dma.ebus_info.regs, 0x10);
    }

    if (chip->port)
        of_iounmap(&op->resource[0], chip->port, 0x10);

    return 0;
}

static int snd_cs4231_ebus_dev_free(struct snd_device *device)
{
    struct snd_cs4231 *cp = device->device_data;

    return snd_cs4231_ebus_free(cp);
}

static struct snd_device_ops snd_cs4231_ebus_dev_ops = {
    .dev_free   =   snd_cs4231_ebus_dev_free,
};

static int __devinit snd_cs4231_ebus_create(struct snd_card *card,
                        struct platform_device *op,
                        int dev)
{
    struct snd_cs4231 *chip = card->private_data;
    int err;

    spin_lock_init(&chip->lock);
    spin_lock_init(&chip->c_dma.ebus_info.lock);
    spin_lock_init(&chip->p_dma.ebus_info.lock);
    mutex_init(&chip->mce_mutex);
    mutex_init(&chip->open_mutex);
    chip->flags |= CS4231_FLAG_EBUS;
    chip->op = op;
    memcpy(&chip->image, &snd_cs4231_original_image,
           sizeof(snd_cs4231_original_image));
    strcpy(chip->c_dma.ebus_info.name, "cs4231(capture)");
    chip->c_dma.ebus_info.flags = EBUS_DMA_FLAG_USE_EBDMA_HANDLER;
    chip->c_dma.ebus_info.callback = snd_cs4231_ebus_capture_callback;
    chip->c_dma.ebus_info.client_cookie = chip;
    chip->c_dma.ebus_info.irq = op->archdata.irqs[0];
    strcpy(chip->p_dma.ebus_info.name, "cs4231(play)");
    chip->p_dma.ebus_info.flags = EBUS_DMA_FLAG_USE_EBDMA_HANDLER;
    chip->p_dma.ebus_info.callback = snd_cs4231_ebus_play_callback;
    chip->p_dma.ebus_info.client_cookie = chip;
    chip->p_dma.ebus_info.irq = op->archdata.irqs[1];

    chip->p_dma.prepare = _ebus_dma_prepare;
    chip->p_dma.enable = _ebus_dma_enable;
    chip->p_dma.request = _ebus_dma_request;
    chip->p_dma.address = _ebus_dma_addr;

    chip->c_dma.prepare = _ebus_dma_prepare;
    chip->c_dma.enable = _ebus_dma_enable;
    chip->c_dma.request = _ebus_dma_request;
    chip->c_dma.address = _ebus_dma_addr;

    chip->port = of_ioremap(&op->resource[0], 0, 0x10, "cs4231");
    chip->p_dma.ebus_info.regs =
        of_ioremap(&op->resource[1], 0, 0x10, "cs4231_pdma");
    chip->c_dma.ebus_info.regs =
        of_ioremap(&op->resource[2], 0, 0x10, "cs4231_cdma");
    if (!chip->port || !chip->p_dma.ebus_info.regs ||
        !chip->c_dma.ebus_info.regs) {
        snd_cs4231_ebus_free(chip);
        snd_printdd("cs4231-%d: Unable to map chip registers.\n", dev);
        return -EIO;
    }

    if (ebus_dma_register(&chip->c_dma.ebus_info)) {
        snd_cs4231_ebus_free(chip);
        snd_printdd("cs4231-%d: Unable to register EBUS capture DMA\n",
                dev);
        return -EBUSY;
    }
    if (ebus_dma_irq_enable(&chip->c_dma.ebus_info, 1)) {
        snd_cs4231_ebus_free(chip);
        snd_printdd("cs4231-%d: Unable to enable EBUS capture IRQ\n",
                dev);
        return -EBUSY;
    }

    if (ebus_dma_register(&chip->p_dma.ebus_info)) {
        snd_cs4231_ebus_free(chip);
        snd_printdd("cs4231-%d: Unable to register EBUS play DMA\n",
                dev);
        return -EBUSY;
    }
    if (ebus_dma_irq_enable(&chip->p_dma.ebus_info, 1)) {
        snd_cs4231_ebus_free(chip);
        snd_printdd("cs4231-%d: Unable to enable EBUS play IRQ\n", dev);
        return -EBUSY;
    }

    if (snd_cs4231_probe(chip) < 0) {
        snd_cs4231_ebus_free(chip);
        return -ENODEV;
    }
    snd_cs4231_init(chip);

    if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL,
                  chip, &snd_cs4231_ebus_dev_ops)) < 0) {
        snd_cs4231_ebus_free(chip);
        return err;
    }

    return 0;
}

static int __devinit cs4231_ebus_probe(struct platform_device *op)
{
    struct snd_card *card;
    int err;

    err = cs4231_attach_begin(&card);
    if (err)
        return err;

    sprintf(card->longname, "%s at 0x%llx, irq %d",
        card->shortname,
        op->resource[0].start,
        op->archdata.irqs[0]);

    err = snd_cs4231_ebus_create(card, op, dev);
    if (err < 0) {
        snd_card_free(card);
        return err;
    }

    return cs4231_attach_finish(card);
}
#endif

static int __devinit cs4231_probe(struct platform_device *op)
{
#ifdef EBUS_SUPPORT
    if (!strcmp(op->dev.of_node->parent->name, "ebus"))
        return cs4231_ebus_probe(op);
#endif
#ifdef SBUS_SUPPORT
    if (!strcmp(op->dev.of_node->parent->name, "sbus") ||
        !strcmp(op->dev.of_node->parent->name, "sbi"))
        return cs4231_sbus_probe(op);
#endif
    return -ENODEV;
}

static int __devexit cs4231_remove(struct platform_device *op)
{
    struct snd_cs4231 *chip = dev_get_drvdata(&op->dev);

    snd_card_free(chip->card);

    return 0;
}

static const struct of_device_id cs4231_match[] = {
    {
        .name = "SUNW,CS4231",
    },
    {
        .name = "audio",
        .compatible = "SUNW,CS4231",
    },
    {},
};

MODULE_DEVICE_TABLE(of, cs4231_match);

static struct platform_driver cs4231_driver = {
    .driver = {
        .name = "audio",
        .owner = THIS_MODULE,
        .of_match_table = cs4231_match,
    },
    .probe      = cs4231_probe,
    .remove     = __devexit_p(cs4231_remove),
};

module_platform_driver(cs4231_driver);