/*
 *
 *  Support for audio capture
 *  PCI function #1 of the cx2388x.
 *
 *    (c) 2007 Trent Piepho <xyzzy@speakeasy.org>
 *    (c) 2005,2006 Ricardo Cerqueira <v4l@cerqueira.org>
 *    (c) 2005 Mauro Carvalho Chehab <mchehab@infradead.org>
 *    Based on a dummy cx88 module by Gerd Knorr <kraxel@bytesex.org>
 *    Based on dummy.c by Jaroslav Kysela <perex@perex.cz>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/vmalloc.h>
#include <linux/dma-mapping.h>
#include <linux/pci.h>
#include <linux/slab.h>

#include <asm/delay.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/control.h>
#include <sound/initval.h>
#include <sound/tlv.h>
#include <media/wm8775.h>

#include "cx88.h"
#include "cx88-reg.h"

#define dprintk(level,fmt, arg...)      if (debug >= level) \
        printk(KERN_INFO "%s/1: " fmt, chip->core->name , ## arg)

#define dprintk_core(level,fmt, arg...) if (debug >= level) \
        printk(KERN_DEBUG "%s/1: " fmt, chip->core->name , ## arg)

/****************************************************************************
        Data type declarations - Can be moded to a header file later
 ****************************************************************************/

struct cx88_audio_buffer {
        unsigned int               bpl;
        struct btcx_riscmem        risc;
        struct videobuf_dmabuf     dma;
};

struct cx88_audio_dev {
        struct cx88_core           *core;
        struct cx88_dmaqueue       q;

        /* pci i/o */
        struct pci_dev             *pci;

        /* audio controls */
        int                        irq;

        struct snd_card            *card;

        spinlock_t                 reg_lock;
        atomic_t                   count;

        unsigned int               dma_size;
        unsigned int               period_size;
        unsigned int               num_periods;

        struct videobuf_dmabuf     *dma_risc;

        struct cx88_audio_buffer   *buf;

        struct snd_pcm_substream   *substream;
};
typedef struct cx88_audio_dev snd_cx88_card_t;



/****************************************************************************
                        Module global static vars
 ****************************************************************************/

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
static const char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 1};

module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable cx88x soundcard. default enabled.");

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for cx88x capture interface(s).");


/****************************************************************************
                                Module macros
 ****************************************************************************/

MODULE_DESCRIPTION("ALSA driver module for cx2388x based TV cards");
MODULE_AUTHOR("Ricardo Cerqueira");
MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
MODULE_LICENSE("GPL");
MODULE_VERSION(CX88_VERSION);

MODULE_SUPPORTED_DEVICE("{{Conexant,23881},"
                        "{{Conexant,23882},"
                        "{{Conexant,23883}");
static unsigned int debug;
module_param(debug,int,0644);
MODULE_PARM_DESC(debug,"enable debug messages");

/****************************************************************************
                        Module specific funtions
 ****************************************************************************/

/*
 * BOARD Specific: Sets audio DMA
 */

static int _cx88_start_audio_dma(snd_cx88_card_t *chip)
{
        struct cx88_audio_buffer *buf = chip->buf;
        struct cx88_core *core=chip->core;
        const struct sram_channel *audio_ch = &cx88_sram_channels[SRAM_CH25];

        /* Make sure RISC/FIFO are off before changing FIFO/RISC settings */
        cx_clear(MO_AUD_DMACNTRL, 0x11);

        /* setup fifo + format - out channel */
        cx88_sram_channel_setup(chip->core, audio_ch, buf->bpl, buf->risc.dma);

        /* sets bpl size */
        cx_write(MO_AUDD_LNGTH, buf->bpl);

        /* reset counter */
        cx_write(MO_AUDD_GPCNTRL, GP_COUNT_CONTROL_RESET);
        atomic_set(&chip->count, 0);

        dprintk(1, "Start audio DMA, %d B/line, %d lines/FIFO, %d periods, %d "
                "byte buffer\n", buf->bpl, cx_read(audio_ch->cmds_start + 8)>>1,
                chip->num_periods, buf->bpl * chip->num_periods);

        /* Enables corresponding bits at AUD_INT_STAT */
        cx_write(MO_AUD_INTMSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
                                AUD_INT_DN_RISCI2 | AUD_INT_DN_RISCI1);

        /* Clean any pending interrupt bits already set */
        cx_write(MO_AUD_INTSTAT, ~0);

        /* enable audio irqs */
        cx_set(MO_PCI_INTMSK, chip->core->pci_irqmask | PCI_INT_AUDINT);

        /* start dma */
        cx_set(MO_DEV_CNTRL2, (1<<5)); /* Enables Risc Processor */
        cx_set(MO_AUD_DMACNTRL, 0x11); /* audio downstream FIFO and RISC enable */

        if (debug)
                cx88_sram_channel_dump(chip->core, audio_ch);

        return 0;
}

/*
 * BOARD Specific: Resets audio DMA
 */
static int _cx88_stop_audio_dma(snd_cx88_card_t *chip)
{
        struct cx88_core *core=chip->core;
        dprintk(1, "Stopping audio DMA\n");

        /* stop dma */
        cx_clear(MO_AUD_DMACNTRL, 0x11);

        /* disable irqs */
        cx_clear(MO_PCI_INTMSK, PCI_INT_AUDINT);
        cx_clear(MO_AUD_INTMSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
                                AUD_INT_DN_RISCI2 | AUD_INT_DN_RISCI1);

        if (debug)
                cx88_sram_channel_dump(chip->core, &cx88_sram_channels[SRAM_CH25]);

        return 0;
}

#define MAX_IRQ_LOOP 50

/*
 * BOARD Specific: IRQ dma bits
 */
static const char *cx88_aud_irqs[32] = {
        "dn_risci1", "up_risci1", "rds_dn_risc1", /* 0-2 */
        NULL,                                     /* reserved */
        "dn_risci2", "up_risci2", "rds_dn_risc2", /* 4-6 */
        NULL,                                     /* reserved */
        "dnf_of", "upf_uf", "rds_dnf_uf",         /* 8-10 */
        NULL,                                     /* reserved */
        "dn_sync", "up_sync", "rds_dn_sync",      /* 12-14 */
        NULL,                                     /* reserved */
        "opc_err", "par_err", "rip_err",          /* 16-18 */
        "pci_abort", "ber_irq", "mchg_irq"        /* 19-21 */
};

/*
 * BOARD Specific: Threats IRQ audio specific calls
 */
static void cx8801_aud_irq(snd_cx88_card_t *chip)
{
        struct cx88_core *core = chip->core;
        u32 status, mask;

        status = cx_read(MO_AUD_INTSTAT);
        mask   = cx_read(MO_AUD_INTMSK);
        if (0 == (status & mask))
                return;
        cx_write(MO_AUD_INTSTAT, status);
        if (debug > 1  ||  (status & mask & ~0xff))
                cx88_print_irqbits(core->name, "irq aud",
                                   cx88_aud_irqs, ARRAY_SIZE(cx88_aud_irqs),
                                   status, mask);
        /* risc op code error */
        if (status & AUD_INT_OPC_ERR) {
                printk(KERN_WARNING "%s/1: Audio risc op code error\n",core->name);
                cx_clear(MO_AUD_DMACNTRL, 0x11);
                cx88_sram_channel_dump(core, &cx88_sram_channels[SRAM_CH25]);
        }
        if (status & AUD_INT_DN_SYNC) {
                dprintk(1, "Downstream sync error\n");
                cx_write(MO_AUDD_GPCNTRL, GP_COUNT_CONTROL_RESET);
                return;
        }
        /* risc1 downstream */
        if (status & AUD_INT_DN_RISCI1) {
                atomic_set(&chip->count, cx_read(MO_AUDD_GPCNT));
                snd_pcm_period_elapsed(chip->substream);
        }
        /* FIXME: Any other status should deserve a special handling? */
}

/*
 * BOARD Specific: Handles IRQ calls
 */
static irqreturn_t cx8801_irq(int irq, void *dev_id)
{
        snd_cx88_card_t *chip = dev_id;
        struct cx88_core *core = chip->core;
        u32 status;
        int loop, handled = 0;

        for (loop = 0; loop < MAX_IRQ_LOOP; loop++) {
                status = cx_read(MO_PCI_INTSTAT) &
                        (core->pci_irqmask | PCI_INT_AUDINT);
                if (0 == status)
                        goto out;
                dprintk(3, "cx8801_irq loop %d/%d, status %x\n",
                        loop, MAX_IRQ_LOOP, status);
                handled = 1;
                cx_write(MO_PCI_INTSTAT, status);

                if (status & core->pci_irqmask)
                        cx88_core_irq(core, status);
                if (status & PCI_INT_AUDINT)
                        cx8801_aud_irq(chip);
        }

        if (MAX_IRQ_LOOP == loop) {
                printk(KERN_ERR
                       "%s/1: IRQ loop detected, disabling interrupts\n",
                       core->name);
                cx_clear(MO_PCI_INTMSK, PCI_INT_AUDINT);
        }

 out:
        return IRQ_RETVAL(handled);
}


static int dsp_buffer_free(snd_cx88_card_t *chip)
{
        BUG_ON(!chip->dma_size);

        dprintk(2,"Freeing buffer\n");
        videobuf_dma_unmap(&chip->pci->dev, chip->dma_risc);
        videobuf_dma_free(chip->dma_risc);
        btcx_riscmem_free(chip->pci,&chip->buf->risc);
        kfree(chip->buf);

        chip->dma_risc = NULL;
        chip->dma_size = 0;

        return 0;
}

/****************************************************************************
                                ALSA PCM Interface
 ****************************************************************************/

/*
 * Digital hardware definition
 */
#define DEFAULT_FIFO_SIZE       4096
static const struct snd_pcm_hardware snd_cx88_digital_hw = {
        .info = SNDRV_PCM_INFO_MMAP |
                SNDRV_PCM_INFO_INTERLEAVED |
                SNDRV_PCM_INFO_BLOCK_TRANSFER |
                SNDRV_PCM_INFO_MMAP_VALID,
        .formats = SNDRV_PCM_FMTBIT_S16_LE,

        .rates =                SNDRV_PCM_RATE_48000,
        .rate_min =             48000,
        .rate_max =             48000,
        .channels_min = 2,
        .channels_max = 2,
        /* Analog audio output will be full of clicks and pops if there
           are not exactly four lines in the SRAM FIFO buffer.  */
        .period_bytes_min = DEFAULT_FIFO_SIZE/4,
        .period_bytes_max = DEFAULT_FIFO_SIZE/4,
        .periods_min = 1,
        .periods_max = 1024,
        .buffer_bytes_max = (1024*1024),
};

/*
 * audio pcm capture open callback
 */
static int snd_cx88_pcm_open(struct snd_pcm_substream *substream)
{
        snd_cx88_card_t *chip = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        int err;

        if (!chip) {
                printk(KERN_ERR "BUG: cx88 can't find device struct."
                                " Can't proceed with open\n");
                return -ENODEV;
        }

        err = snd_pcm_hw_constraint_pow2(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS);
        if (err < 0)
                goto _error;

        chip->substream = substream;

        runtime->hw = snd_cx88_digital_hw;

        if (cx88_sram_channels[SRAM_CH25].fifo_size != DEFAULT_FIFO_SIZE) {
                unsigned int bpl = cx88_sram_channels[SRAM_CH25].fifo_size / 4;
                bpl &= ~7; /* must be multiple of 8 */
                runtime->hw.period_bytes_min = bpl;
                runtime->hw.period_bytes_max = bpl;
        }

        return 0;
_error:
        dprintk(1,"Error opening PCM!\n");
        return err;
}

/*
 * audio close callback
 */
static int snd_cx88_close(struct snd_pcm_substream *substream)
{
        return 0;
}

/*
 * hw_params callback
 */
static int snd_cx88_hw_params(struct snd_pcm_substream * substream,
                              struct snd_pcm_hw_params * hw_params)
{
        snd_cx88_card_t *chip = snd_pcm_substream_chip(substream);
        struct videobuf_dmabuf *dma;

        struct cx88_audio_buffer *buf;
        int ret;

        if (substream->runtime->dma_area) {
                dsp_buffer_free(chip);
                substream->runtime->dma_area = NULL;
        }

        chip->period_size = params_period_bytes(hw_params);
        chip->num_periods = params_periods(hw_params);
        chip->dma_size = chip->period_size * params_periods(hw_params);

        BUG_ON(!chip->dma_size);
        BUG_ON(chip->num_periods & (chip->num_periods-1));

        buf = kzalloc(sizeof(*buf), GFP_KERNEL);
        if (NULL == buf)
                return -ENOMEM;

        buf->bpl = chip->period_size;

        dma = &buf->dma;
        videobuf_dma_init(dma);
        ret = videobuf_dma_init_kernel(dma, PCI_DMA_FROMDEVICE,
                        (PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT));
        if (ret < 0)
                goto error;

        ret = videobuf_dma_map(&chip->pci->dev, dma);
        if (ret < 0)
                goto error;

        ret = cx88_risc_databuffer(chip->pci, &buf->risc, dma->sglist,
                                   chip->period_size, chip->num_periods, 1);
        if (ret < 0)
                goto error;

        /* Loop back to start of program */
        buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP|RISC_IRQ1|RISC_CNT_INC);
        buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma);

        chip->buf = buf;
        chip->dma_risc = dma;

        substream->runtime->dma_area = chip->dma_risc->vaddr;
        substream->runtime->dma_bytes = chip->dma_size;
        substream->runtime->dma_addr = 0;
        return 0;

error:
        kfree(buf);
        return ret;
}

/*
 * hw free callback
 */
static int snd_cx88_hw_free(struct snd_pcm_substream * substream)
{

        snd_cx88_card_t *chip = snd_pcm_substream_chip(substream);

        if (substream->runtime->dma_area) {
                dsp_buffer_free(chip);
                substream->runtime->dma_area = NULL;
        }

        return 0;
}

/*
 * prepare callback
 */
static int snd_cx88_prepare(struct snd_pcm_substream *substream)
{
        return 0;
}

/*
 * trigger callback
 */
static int snd_cx88_card_trigger(struct snd_pcm_substream *substream, int cmd)
{
        snd_cx88_card_t *chip = snd_pcm_substream_chip(substream);
        int err;

        /* Local interrupts are already disabled by ALSA */
        spin_lock(&chip->reg_lock);

        switch (cmd) {
        case SNDRV_PCM_TRIGGER_START:
                err=_cx88_start_audio_dma(chip);
                break;
        case SNDRV_PCM_TRIGGER_STOP:
                err=_cx88_stop_audio_dma(chip);
                break;
        default:
                err=-EINVAL;
                break;
        }

        spin_unlock(&chip->reg_lock);

        return err;
}

/*
 * pointer callback
 */
static snd_pcm_uframes_t snd_cx88_pointer(struct snd_pcm_substream *substream)
{
        snd_cx88_card_t *chip = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        u16 count;

        count = atomic_read(&chip->count);

//      dprintk(2, "%s - count %d (+%u), period %d, frame %lu\n", __func__,
//              count, new, count & (runtime->periods-1),
//              runtime->period_size * (count & (runtime->periods-1)));
        return runtime->period_size * (count & (runtime->periods-1));
}

/*
 * page callback (needed for mmap)
 */
static struct page *snd_cx88_page(struct snd_pcm_substream *substream,
                                unsigned long offset)
{
        void *pageptr = substream->runtime->dma_area + offset;
        return vmalloc_to_page(pageptr);
}

/*
 * operators
 */
static struct snd_pcm_ops snd_cx88_pcm_ops = {
        .open = snd_cx88_pcm_open,
        .close = snd_cx88_close,
        .ioctl = snd_pcm_lib_ioctl,
        .hw_params = snd_cx88_hw_params,
        .hw_free = snd_cx88_hw_free,
        .prepare = snd_cx88_prepare,
        .trigger = snd_cx88_card_trigger,
        .pointer = snd_cx88_pointer,
        .page = snd_cx88_page,
};

/*
 * create a PCM device
 */
static int __devinit snd_cx88_pcm(snd_cx88_card_t *chip, int device, const char *name)
{
        int err;
        struct snd_pcm *pcm;

        err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm);
        if (err < 0)
                return err;
        pcm->private_data = chip;
        strcpy(pcm->name, name);
        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx88_pcm_ops);

        return 0;
}

/****************************************************************************
                                CONTROL INTERFACE
 ****************************************************************************/
static int snd_cx88_volume_info(struct snd_kcontrol *kcontrol,
                                struct snd_ctl_elem_info *info)
{
        info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
        info->count = 2;
        info->value.integer.min = 0;
        info->value.integer.max = 0x3f;

        return 0;
}

static int snd_cx88_volume_get(struct snd_kcontrol *kcontrol,
                               struct snd_ctl_elem_value *value)
{
        snd_cx88_card_t *chip = snd_kcontrol_chip(kcontrol);
        struct cx88_core *core=chip->core;
        int vol = 0x3f - (cx_read(AUD_VOL_CTL) & 0x3f),
            bal = cx_read(AUD_BAL_CTL);

        value->value.integer.value[(bal & 0x40) ? 0 : 1] = vol;
        vol -= (bal & 0x3f);
        value->value.integer.value[(bal & 0x40) ? 1 : 0] = vol < 0 ? 0 : vol;

        return 0;
}

static void snd_cx88_wm8775_volume_put(struct snd_kcontrol *kcontrol,
                               struct snd_ctl_elem_value *value)
{
        snd_cx88_card_t *chip = snd_kcontrol_chip(kcontrol);
        struct cx88_core *core = chip->core;
        int left = value->value.integer.value[0];
        int right = value->value.integer.value[1];
        int v, b;

        /* Pass volume & balance onto any WM8775 */
        if (left >= right) {
                v = left << 10;
                b = left ? (0x8000 * right) / left : 0x8000;
        } else {
                v = right << 10;
                b = right ? 0xffff - (0x8000 * left) / right : 0x8000;
        }
        wm8775_s_ctrl(core, V4L2_CID_AUDIO_VOLUME, v);
        wm8775_s_ctrl(core, V4L2_CID_AUDIO_BALANCE, b);
}

/* OK - TODO: test it */
static int snd_cx88_volume_put(struct snd_kcontrol *kcontrol,
                               struct snd_ctl_elem_value *value)
{
        snd_cx88_card_t *chip = snd_kcontrol_chip(kcontrol);
        struct cx88_core *core=chip->core;
        int left, right, v, b;
        int changed = 0;
        u32 old;

        if (core->board.audio_chip == V4L2_IDENT_WM8775)
                snd_cx88_wm8775_volume_put(kcontrol, value);

        left = value->value.integer.value[0] & 0x3f;
        right = value->value.integer.value[1] & 0x3f;
        b = right - left;
        if (b < 0) {
                v = 0x3f - left;
                b = (-b) | 0x40;
        } else {
                v = 0x3f - right;
        }
        /* Do we really know this will always be called with IRQs on? */
        spin_lock_irq(&chip->reg_lock);
        old = cx_read(AUD_VOL_CTL);
        if (v != (old & 0x3f)) {
                cx_swrite(SHADOW_AUD_VOL_CTL, AUD_VOL_CTL, (old & ~0x3f) | v);
                changed = 1;
        }
        if ((cx_read(AUD_BAL_CTL) & 0x7f) != b) {
                cx_write(AUD_BAL_CTL, b);
                changed = 1;
        }
        spin_unlock_irq(&chip->reg_lock);

        return changed;
}

static const DECLARE_TLV_DB_SCALE(snd_cx88_db_scale, -6300, 100, 0);

static const struct snd_kcontrol_new snd_cx88_volume = {
        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
                  SNDRV_CTL_ELEM_ACCESS_TLV_READ,
        .name = "Analog-TV Volume",
        .info = snd_cx88_volume_info,
        .get = snd_cx88_volume_get,
        .put = snd_cx88_volume_put,
        .tlv.p = snd_cx88_db_scale,
};

static int snd_cx88_switch_get(struct snd_kcontrol *kcontrol,
                               struct snd_ctl_elem_value *value)
{
        snd_cx88_card_t *chip = snd_kcontrol_chip(kcontrol);
        struct cx88_core *core = chip->core;
        u32 bit = kcontrol->private_value;

        value->value.integer.value[0] = !(cx_read(AUD_VOL_CTL) & bit);
        return 0;
}

static int snd_cx88_switch_put(struct snd_kcontrol *kcontrol,
                                       struct snd_ctl_elem_value *value)
{
        snd_cx88_card_t *chip = snd_kcontrol_chip(kcontrol);
        struct cx88_core *core = chip->core;
        u32 bit = kcontrol->private_value;
        int ret = 0;
        u32 vol;

        spin_lock_irq(&chip->reg_lock);
        vol = cx_read(AUD_VOL_CTL);
        if (value->value.integer.value[0] != !(vol & bit)) {
                vol ^= bit;
                cx_swrite(SHADOW_AUD_VOL_CTL, AUD_VOL_CTL, vol);
                /* Pass mute onto any WM8775 */
                if ((core->board.audio_chip == V4L2_IDENT_WM8775) &&
                    ((1<<6) == bit))
                        wm8775_s_ctrl(core, V4L2_CID_AUDIO_MUTE, 0 != (vol & bit));
                ret = 1;
        }
        spin_unlock_irq(&chip->reg_lock);
        return ret;
}

static const struct snd_kcontrol_new snd_cx88_dac_switch = {
        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
        .name = "Audio-Out Switch",
        .info = snd_ctl_boolean_mono_info,
        .get = snd_cx88_switch_get,
        .put = snd_cx88_switch_put,
        .private_value = (1<<8),
};

static const struct snd_kcontrol_new snd_cx88_source_switch = {
        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
        .name = "Analog-TV Switch",
        .info = snd_ctl_boolean_mono_info,
        .get = snd_cx88_switch_get,
        .put = snd_cx88_switch_put,
        .private_value = (1<<6),
};

static int snd_cx88_alc_get(struct snd_kcontrol *kcontrol,
                               struct snd_ctl_elem_value *value)
{
        snd_cx88_card_t *chip = snd_kcontrol_chip(kcontrol);
        struct cx88_core *core = chip->core;
        s32 val;

        val = wm8775_g_ctrl(core, V4L2_CID_AUDIO_LOUDNESS);
        value->value.integer.value[0] = val ? 1 : 0;
        return 0;
}

static int snd_cx88_alc_put(struct snd_kcontrol *kcontrol,
                                       struct snd_ctl_elem_value *value)
{
        snd_cx88_card_t *chip = snd_kcontrol_chip(kcontrol);
        struct cx88_core *core = chip->core;
        struct v4l2_control client_ctl;

        memset(&client_ctl, 0, sizeof(client_ctl));
        client_ctl.value = 0 != value->value.integer.value[0];
        client_ctl.id = V4L2_CID_AUDIO_LOUDNESS;
        call_hw(core, WM8775_GID, core, s_ctrl, &client_ctl);

        return 0;
}

static struct snd_kcontrol_new snd_cx88_alc_switch = {
        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
        .name = "Line-In ALC Switch",
        .info = snd_ctl_boolean_mono_info,
        .get = snd_cx88_alc_get,
        .put = snd_cx88_alc_put,
};

/****************************************************************************
                        Basic Flow for Sound Devices
 ****************************************************************************/

/*
 * PCI ID Table - 14f1:8801 and 14f1:8811 means function 1: Audio
 * Only boards with eeprom and byte 1 at eeprom=1 have it
 */

static const struct pci_device_id const cx88_audio_pci_tbl[] __devinitdata = {
        {0x14f1,0x8801,PCI_ANY_ID,PCI_ANY_ID,0,0,0},
        {0x14f1,0x8811,PCI_ANY_ID,PCI_ANY_ID,0,0,0},
        {0, }
};
MODULE_DEVICE_TABLE(pci, cx88_audio_pci_tbl);

/*
 * Chip-specific destructor
 */

static int snd_cx88_free(snd_cx88_card_t *chip)
{

        if (chip->irq >= 0)
                free_irq(chip->irq, chip);

        cx88_core_put(chip->core,chip->pci);

        pci_disable_device(chip->pci);
        return 0;
}

/*
 * Component Destructor
 */
static void snd_cx88_dev_free(struct snd_card * card)
{
        snd_cx88_card_t *chip = card->private_data;

        snd_cx88_free(chip);
}


/*
 * Alsa Constructor - Component probe
 */

static int devno;
static int __devinit snd_cx88_create(struct snd_card *card,
                                     struct pci_dev *pci,
                                     snd_cx88_card_t **rchip,
                                     struct cx88_core **core_ptr)
{
        snd_cx88_card_t   *chip;
        struct cx88_core  *core;
        int               err;
        unsigned char     pci_lat;

        *rchip = NULL;

        err = pci_enable_device(pci);
        if (err < 0)
                return err;

        pci_set_master(pci);

        chip = card->private_data;

        core = cx88_core_get(pci);
        if (NULL == core) {
                err = -EINVAL;
                return err;
        }

        if (!pci_dma_supported(pci,DMA_BIT_MASK(32))) {
                dprintk(0, "%s/1: Oops: no 32bit PCI DMA ???\n",core->name);
                err = -EIO;
                cx88_core_put(core, pci);
                return err;
        }


        /* pci init */
        chip->card = card;
        chip->pci = pci;
        chip->irq = -1;
        spin_lock_init(&chip->reg_lock);

        chip->core = core;

        /* get irq */
        err = request_irq(chip->pci->irq, cx8801_irq,
                          IRQF_SHARED | IRQF_DISABLED, chip->core->name, chip);
        if (err < 0) {
                dprintk(0, "%s: can't get IRQ %d\n",
                       chip->core->name, chip->pci->irq);
                return err;
        }

        /* print pci info */
        pci_read_config_byte(pci, PCI_LATENCY_TIMER, &pci_lat);

        dprintk(1,"ALSA %s/%i: found at %s, rev: %d, irq: %d, "
               "latency: %d, mmio: 0x%llx\n", core->name, devno,
               pci_name(pci), pci->revision, pci->irq,
               pci_lat, (unsigned long long)pci_resource_start(pci,0));

        chip->irq = pci->irq;
        synchronize_irq(chip->irq);

        snd_card_set_dev(card, &pci->dev);

        *rchip = chip;
        *core_ptr = core;

        return 0;
}

static int __devinit cx88_audio_initdev(struct pci_dev *pci,
                                    const struct pci_device_id *pci_id)
{
        struct snd_card  *card;
        snd_cx88_card_t  *chip;
        struct cx88_core *core = NULL;
        int              err;

        if (devno >= SNDRV_CARDS)
                return (-ENODEV);

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

        err = snd_card_create(index[devno], id[devno], THIS_MODULE,
                              sizeof(snd_cx88_card_t), &card);
        if (err < 0)
                return err;

        card->private_free = snd_cx88_dev_free;

        err = snd_cx88_create(card, pci, &chip, &core);
        if (err < 0)
                goto error;

        err = snd_cx88_pcm(chip, 0, "CX88 Digital");
        if (err < 0)
                goto error;

        err = snd_ctl_add(card, snd_ctl_new1(&snd_cx88_volume, chip));
        if (err < 0)
                goto error;
        err = snd_ctl_add(card, snd_ctl_new1(&snd_cx88_dac_switch, chip));
        if (err < 0)
                goto error;
        err = snd_ctl_add(card, snd_ctl_new1(&snd_cx88_source_switch, chip));
        if (err < 0)
                goto error;

        /* If there's a wm8775 then add a Line-In ALC switch */
        if (core->board.audio_chip == V4L2_IDENT_WM8775)
                snd_ctl_add(card, snd_ctl_new1(&snd_cx88_alc_switch, chip));

        strcpy (card->driver, "CX88x");
        sprintf(card->shortname, "Conexant CX%x", pci->device);
        sprintf(card->longname, "%s at %#llx",
                card->shortname,(unsigned long long)pci_resource_start(pci, 0));
        strcpy (card->mixername, "CX88");

        dprintk (0, "%s/%i: ALSA support for cx2388x boards\n",
               card->driver,devno);

        err = snd_card_register(card);
        if (err < 0)
                goto error;
        pci_set_drvdata(pci,card);

        devno++;
        return 0;

error:
        snd_card_free(card);
        return err;
}
/*
 * ALSA destructor
 */
static void __devexit cx88_audio_finidev(struct pci_dev *pci)
{
        struct cx88_audio_dev *card = pci_get_drvdata(pci);

        snd_card_free((void *)card);

        pci_set_drvdata(pci, NULL);

        devno--;
}

/*
 * PCI driver definition
 */

static struct pci_driver cx88_audio_pci_driver = {
        .name     = "cx88_audio",
        .id_table = cx88_audio_pci_tbl,
        .probe    = cx88_audio_initdev,
        .remove   = __devexit_p(cx88_audio_finidev),
};

/****************************************************************************
                                LINUX MODULE INIT
 ****************************************************************************/

/*
 * module init
 */
static int __init cx88_audio_init(void)
{
        printk(KERN_INFO "cx2388x alsa driver version %s loaded\n",
               CX88_VERSION);
        return pci_register_driver(&cx88_audio_pci_driver);
}

/*
 * module remove
 */
static void __exit cx88_audio_fini(void)
{
        pci_unregister_driver(&cx88_audio_pci_driver);
}

module_init(cx88_audio_init);
module_exit(cx88_audio_fini);