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saa7134-alsa.c

/*
 *   SAA713x ALSA support for V4L
 *
 *   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, version 2
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/wait.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/initval.h>
#include <linux/interrupt.h>

#include "saa7134.h"
#include "saa7134-reg.h"

static unsigned int debug  = 0;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug,"enable debug messages [alsa]");

/*
 * Configuration macros
 */

/* defaults */
#define MIXER_ADDR_TVTUNER    0
#define MIXER_ADDR_LINE1      1
#define MIXER_ADDR_LINE2      2
#define MIXER_ADDR_LAST       2


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

module_param_array(index, int, NULL, 0444);
module_param_array(enable, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for SAA7134 capture interface(s).");
MODULE_PARM_DESC(enable, "Enable (or not) the SAA7134 capture interface(s).");

#define dprintk(fmt, arg...)    if (debug) \
      printk(KERN_DEBUG "%s/alsa: " fmt, dev->name , ##arg)



/*
 * Main chip structure
 */

typedef struct snd_card_saa7134 {
      struct snd_card *card;
      spinlock_t mixer_lock;
      int mixer_volume[MIXER_ADDR_LAST+1][2];
      int capture_source[MIXER_ADDR_LAST+1][2];
      struct pci_dev *pci;
      struct saa7134_dev *dev;

      unsigned long iobase;
      s16 irq;
      u16 mute_was_on;

      spinlock_t lock;
} snd_card_saa7134_t;



/*
 * PCM structure
 */

typedef struct snd_card_saa7134_pcm {
      struct saa7134_dev *dev;

      spinlock_t lock;

      struct snd_pcm_substream *substream;
} snd_card_saa7134_pcm_t;

static struct snd_card *snd_saa7134_cards[SNDRV_CARDS];


/*
 * saa7134 DMA audio stop
 *
 *   Called when the capture device is released or the buffer overflows
 *
 *   - Copied verbatim from saa7134-oss's dsp_dma_stop.
 *
 */

static void saa7134_dma_stop(struct saa7134_dev *dev)
{
      dev->dmasound.dma_blk     = -1;
      dev->dmasound.dma_running = 0;
      saa7134_set_dmabits(dev);
}

/*
 * saa7134 DMA audio start
 *
 *   Called when preparing the capture device for use
 *
 *   - Copied verbatim from saa7134-oss's dsp_dma_start.
 *
 */

static void saa7134_dma_start(struct saa7134_dev *dev)
{
      dev->dmasound.dma_blk     = 0;
      dev->dmasound.dma_running = 1;
      saa7134_set_dmabits(dev);
}

/*
 * saa7134 audio DMA IRQ handler
 *
 *   Called whenever we get an SAA7134_IRQ_REPORT_DONE_RA3 interrupt
 *   Handles shifting between the 2 buffers, manages the read counters,
 *  and notifies ALSA when periods elapse
 *
 *   - Mostly copied from saa7134-oss's saa7134_irq_oss_done.
 *
 */

static void saa7134_irq_alsa_done(struct saa7134_dev *dev,
                          unsigned long status)
{
      int next_blk, reg = 0;

      spin_lock(&dev->slock);
      if (UNSET == dev->dmasound.dma_blk) {
            dprintk("irq: recording stopped\n");
            goto done;
      }
      if (0 != (status & 0x0f000000))
            dprintk("irq: lost %ld\n", (status >> 24) & 0x0f);
      if (0 == (status & 0x10000000)) {
            /* odd */
            if (0 == (dev->dmasound.dma_blk & 0x01))
                  reg = SAA7134_RS_BA1(6);
      } else {
            /* even */
            if (1 == (dev->dmasound.dma_blk & 0x01))
                  reg = SAA7134_RS_BA2(6);
      }
      if (0 == reg) {
            dprintk("irq: field oops [%s]\n",
                  (status & 0x10000000) ? "even" : "odd");
            goto done;
      }

      if (dev->dmasound.read_count >= dev->dmasound.blksize * (dev->dmasound.blocks-2)) {
            dprintk("irq: overrun [full=%d/%d] - Blocks in %d\n",dev->dmasound.read_count,
                  dev->dmasound.bufsize, dev->dmasound.blocks);
            spin_unlock(&dev->slock);
            snd_pcm_stop(dev->dmasound.substream,SNDRV_PCM_STATE_XRUN);
            return;
      }

      /* next block addr */
      next_blk = (dev->dmasound.dma_blk + 2) % dev->dmasound.blocks;
      saa_writel(reg,next_blk * dev->dmasound.blksize);
      if (debug > 2)
            dprintk("irq: ok, %s, next_blk=%d, addr=%x, blocks=%u, size=%u, read=%u\n",
                  (status & 0x10000000) ? "even" : "odd ", next_blk,
                  next_blk * dev->dmasound.blksize, dev->dmasound.blocks, dev->dmasound.blksize, dev->dmasound.read_count);

      /* update status & wake waiting readers */
      dev->dmasound.dma_blk = (dev->dmasound.dma_blk + 1) % dev->dmasound.blocks;
      dev->dmasound.read_count += dev->dmasound.blksize;

      dev->dmasound.recording_on = reg;

      if (dev->dmasound.read_count >= snd_pcm_lib_period_bytes(dev->dmasound.substream)) {
            spin_unlock(&dev->slock);
            snd_pcm_period_elapsed(dev->dmasound.substream);
            spin_lock(&dev->slock);
      }

 done:
      spin_unlock(&dev->slock);

}

/*
 * IRQ request handler
 *
 *   Runs along with saa7134's IRQ handler, discards anything that isn't
 *   DMA sound
 *
 */

static irqreturn_t saa7134_alsa_irq(int irq, void *dev_id)
{
      struct saa7134_dmasound *dmasound = dev_id;
      struct saa7134_dev *dev = dmasound->priv_data;

      unsigned long report, status;
      int loop, handled = 0;

      for (loop = 0; loop < 10; loop++) {
            report = saa_readl(SAA7134_IRQ_REPORT);
            status = saa_readl(SAA7134_IRQ_STATUS);

            if (report & SAA7134_IRQ_REPORT_DONE_RA3) {
                  handled = 1;
                  saa_writel(SAA7134_IRQ_REPORT,
                           SAA7134_IRQ_REPORT_DONE_RA3);
                  saa7134_irq_alsa_done(dev, status);
            } else {
                  goto out;
            }
      }

      if (loop == 10) {
            dprintk("error! looping IRQ!");
      }

out:
      return IRQ_RETVAL(handled);
}

/*
 * ALSA capture trigger
 *
 *   - One of the ALSA capture callbacks.
 *
 *   Called whenever a capture is started or stopped. Must be defined,
 *   but there's nothing we want to do here
 *
 */

static int snd_card_saa7134_capture_trigger(struct snd_pcm_substream * substream,
                                int cmd)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      snd_card_saa7134_pcm_t *pcm = runtime->private_data;
      struct saa7134_dev *dev=pcm->dev;
      int err = 0;

      spin_lock(&dev->slock);
      if (cmd == SNDRV_PCM_TRIGGER_START) {
            /* start dma */
            saa7134_dma_start(dev);
      } else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
            /* stop dma */
            saa7134_dma_stop(dev);
      } else {
            err = -EINVAL;
      }
      spin_unlock(&dev->slock);

      return err;
}

/*
 * DMA buffer initialization
 *
 *   Uses V4L functions to initialize the DMA. Shouldn't be necessary in
 *  ALSA, but I was unable to use ALSA's own DMA, and had to force the
 *  usage of V4L's
 *
 *   - Copied verbatim from saa7134-oss.
 *
 */

static int dsp_buffer_init(struct saa7134_dev *dev)
{
      int err;

      BUG_ON(!dev->dmasound.bufsize);

      videobuf_dma_init(&dev->dmasound.dma);
      err = videobuf_dma_init_kernel(&dev->dmasound.dma, PCI_DMA_FROMDEVICE,
                               (dev->dmasound.bufsize + PAGE_SIZE) >> PAGE_SHIFT);
      if (0 != err)
            return err;
      return 0;
}

/*
 * DMA buffer release
 *
 *   Called after closing the device, during snd_card_saa7134_capture_close
 *
 */

static int dsp_buffer_free(struct saa7134_dev *dev)
{
      BUG_ON(!dev->dmasound.blksize);

      videobuf_dma_free(&dev->dmasound.dma);

      dev->dmasound.blocks  = 0;
      dev->dmasound.blksize = 0;
      dev->dmasound.bufsize = 0;

      return 0;
}


/*
 * ALSA PCM preparation
 *
 *   - One of the ALSA capture callbacks.
 *
 *   Called right after the capture device is opened, this function configures
 *  the buffer using the previously defined functions, allocates the memory,
 *  sets up the hardware registers, and then starts the DMA. When this function
 *  returns, the audio should be flowing.
 *
 */

static int snd_card_saa7134_capture_prepare(struct snd_pcm_substream * substream)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      int bswap, sign;
      u32 fmt, control;
      snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
      struct saa7134_dev *dev;
      snd_card_saa7134_pcm_t *pcm = runtime->private_data;

      pcm->dev->dmasound.substream = substream;

      dev = saa7134->dev;

      if (snd_pcm_format_width(runtime->format) == 8)
            fmt = 0x00;
      else
            fmt = 0x01;

      if (snd_pcm_format_signed(runtime->format))
            sign = 1;
      else
            sign = 0;

      if (snd_pcm_format_big_endian(runtime->format))
            bswap = 1;
      else
            bswap = 0;

      switch (dev->pci->device) {
        case PCI_DEVICE_ID_PHILIPS_SAA7134:
            if (1 == runtime->channels)
                  fmt |= (1 << 3);
            if (2 == runtime->channels)
                  fmt |= (3 << 3);
            if (sign)
                  fmt |= 0x04;

            fmt |= (MIXER_ADDR_TVTUNER == dev->dmasound.input) ? 0xc0 : 0x80;
            saa_writeb(SAA7134_NUM_SAMPLES0, ((dev->dmasound.blksize - 1) & 0x0000ff));
            saa_writeb(SAA7134_NUM_SAMPLES1, ((dev->dmasound.blksize - 1) & 0x00ff00) >>  8);
            saa_writeb(SAA7134_NUM_SAMPLES2, ((dev->dmasound.blksize - 1) & 0xff0000) >> 16);
            saa_writeb(SAA7134_AUDIO_FORMAT_CTRL, fmt);

            break;
        case PCI_DEVICE_ID_PHILIPS_SAA7133:
        case PCI_DEVICE_ID_PHILIPS_SAA7135:
            if (1 == runtime->channels)
                  fmt |= (1 << 4);
            if (2 == runtime->channels)
                  fmt |= (2 << 4);
            if (!sign)
                  fmt |= 0x04;
            saa_writel(SAA7133_NUM_SAMPLES, dev->dmasound.blksize -1);
            saa_writel(SAA7133_AUDIO_CHANNEL, 0x543210 | (fmt << 24));
            break;
      }

      dprintk("rec_start: afmt=%d ch=%d  =>  fmt=0x%x swap=%c\n",
            runtime->format, runtime->channels, fmt,
            bswap ? 'b' : '-');
      /* dma: setup channel 6 (= AUDIO) */
      control = SAA7134_RS_CONTROL_BURST_16 |
            SAA7134_RS_CONTROL_ME |
            (dev->dmasound.pt.dma >> 12);
      if (bswap)
            control |= SAA7134_RS_CONTROL_BSWAP;

      saa_writel(SAA7134_RS_BA1(6),0);
      saa_writel(SAA7134_RS_BA2(6),dev->dmasound.blksize);
      saa_writel(SAA7134_RS_PITCH(6),0);
      saa_writel(SAA7134_RS_CONTROL(6),control);

      dev->dmasound.rate = runtime->rate;

      return 0;

}

/*
 * ALSA pointer fetching
 *
 *   - One of the ALSA capture callbacks.
 *
 *   Called whenever a period elapses, it must return the current hardware
 *  position of the buffer.
 *   Also resets the read counter used to prevent overruns
 *
 */

static snd_pcm_uframes_t
snd_card_saa7134_capture_pointer(struct snd_pcm_substream * substream)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      snd_card_saa7134_pcm_t *pcm = runtime->private_data;
      struct saa7134_dev *dev=pcm->dev;

      if (dev->dmasound.read_count) {
            dev->dmasound.read_count  -= snd_pcm_lib_period_bytes(substream);
            dev->dmasound.read_offset += snd_pcm_lib_period_bytes(substream);
            if (dev->dmasound.read_offset == dev->dmasound.bufsize)
                  dev->dmasound.read_offset = 0;
      }

      return bytes_to_frames(runtime, dev->dmasound.read_offset);
}

/*
 * ALSA hardware capabilities definition
 */

static struct snd_pcm_hardware snd_card_saa7134_capture =
{
      .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 | \
                        SNDRV_PCM_FMTBIT_S16_BE | \
                        SNDRV_PCM_FMTBIT_S8 | \
                        SNDRV_PCM_FMTBIT_U8 | \
                        SNDRV_PCM_FMTBIT_U16_LE | \
                        SNDRV_PCM_FMTBIT_U16_BE,
      .rates =          SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_48000,
      .rate_min =       32000,
      .rate_max =       48000,
      .channels_min =         1,
      .channels_max =         2,
      .buffer_bytes_max =     (256*1024),
      .period_bytes_min =     64,
      .period_bytes_max =     (256*1024),
      .periods_min =          4,
      .periods_max =          1024,
};

static void snd_card_saa7134_runtime_free(struct snd_pcm_runtime *runtime)
{
      snd_card_saa7134_pcm_t *pcm = runtime->private_data;

      kfree(pcm);
}


/*
 * ALSA hardware params
 *
 *   - One of the ALSA capture callbacks.
 *
 *   Called on initialization, right before the PCM preparation
 *
 */

static int snd_card_saa7134_hw_params(struct snd_pcm_substream * substream,
                              struct snd_pcm_hw_params * hw_params)
{
      snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
      struct saa7134_dev *dev;
      unsigned int period_size, periods;
      int err;

      period_size = params_period_bytes(hw_params);
      periods = params_periods(hw_params);

      snd_assert(period_size >= 0x100 && period_size <= 0x10000,
               return -EINVAL);
      snd_assert(periods >= 4, return -EINVAL);
      snd_assert(period_size * periods <= 1024 * 1024, return -EINVAL);

      dev = saa7134->dev;

      if (dev->dmasound.blocks == periods &&
          dev->dmasound.blksize == period_size)
            return 0;

      /* release the old buffer */
      if (substream->runtime->dma_area) {
            saa7134_pgtable_free(dev->pci, &dev->dmasound.pt);
            videobuf_pci_dma_unmap(dev->pci, &dev->dmasound.dma);
            dsp_buffer_free(dev);
            substream->runtime->dma_area = NULL;
      }
      dev->dmasound.blocks  = periods;
      dev->dmasound.blksize = period_size;
      dev->dmasound.bufsize = period_size * periods;

      err = dsp_buffer_init(dev);
      if (0 != err) {
            dev->dmasound.blocks  = 0;
            dev->dmasound.blksize = 0;
            dev->dmasound.bufsize = 0;
            return err;
      }

      if (0 != (err = videobuf_pci_dma_map(dev->pci, &dev->dmasound.dma))) {
            dsp_buffer_free(dev);
            return err;
      }
      if (0 != (err = saa7134_pgtable_alloc(dev->pci,&dev->dmasound.pt))) {
            videobuf_pci_dma_unmap(dev->pci, &dev->dmasound.dma);
            dsp_buffer_free(dev);
            return err;
      }
      if (0 != (err = saa7134_pgtable_build(dev->pci,&dev->dmasound.pt,
                                    dev->dmasound.dma.sglist,
                                    dev->dmasound.dma.sglen,
                                    0))) {
            saa7134_pgtable_free(dev->pci, &dev->dmasound.pt);
            videobuf_pci_dma_unmap(dev->pci, &dev->dmasound.dma);
            dsp_buffer_free(dev);
            return err;
      }

      /* I should be able to use runtime->dma_addr in the control
         byte, but it doesn't work. So I allocate the DMA using the
         V4L functions, and force ALSA to use that as the DMA area */

      substream->runtime->dma_area = dev->dmasound.dma.vmalloc;
      substream->runtime->dma_bytes = dev->dmasound.bufsize;
      substream->runtime->dma_addr = 0;

      return 0;

}

/*
 * ALSA hardware release
 *
 *   - One of the ALSA capture callbacks.
 *
 *   Called after closing the device, but before snd_card_saa7134_capture_close
 *   It stops the DMA audio and releases the buffers.
 *
 */

static int snd_card_saa7134_hw_free(struct snd_pcm_substream * substream)
{
      snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
      struct saa7134_dev *dev;

      dev = saa7134->dev;

      if (substream->runtime->dma_area) {
            saa7134_pgtable_free(dev->pci, &dev->dmasound.pt);
            videobuf_pci_dma_unmap(dev->pci, &dev->dmasound.dma);
            dsp_buffer_free(dev);
            substream->runtime->dma_area = NULL;
      }

      return 0;
}

/*
 * ALSA capture finish
 *
 *   - One of the ALSA capture callbacks.
 *
 *   Called after closing the device.
 *
 */

static int snd_card_saa7134_capture_close(struct snd_pcm_substream * substream)
{
      snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
      struct saa7134_dev *dev = saa7134->dev;

      if (saa7134->mute_was_on) {
            dev->ctl_mute = 1;
            saa7134_tvaudio_setmute(dev);
      }
      return 0;
}

/*
 * ALSA capture start
 *
 *   - One of the ALSA capture callbacks.
 *
 *   Called when opening the device. It creates and populates the PCM
 *  structure
 *
 */

static int snd_card_saa7134_capture_open(struct snd_pcm_substream * substream)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      snd_card_saa7134_pcm_t *pcm;
      snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
      struct saa7134_dev *dev = saa7134->dev;
      int amux, err;

      mutex_lock(&dev->dmasound.lock);

      dev->dmasound.read_count  = 0;
      dev->dmasound.read_offset = 0;

      amux = dev->input->amux;
      if ((amux < 1) || (amux > 3))
            amux = 1;
      dev->dmasound.input  =  amux - 1;

      mutex_unlock(&dev->dmasound.lock);

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

      pcm->dev=saa7134->dev;

      spin_lock_init(&pcm->lock);

      pcm->substream = substream;
      runtime->private_data = pcm;
      runtime->private_free = snd_card_saa7134_runtime_free;
      runtime->hw = snd_card_saa7134_capture;

      if (dev->ctl_mute != 0) {
            saa7134->mute_was_on = 1;
            dev->ctl_mute = 0;
            saa7134_tvaudio_setmute(dev);
      }

      err = snd_pcm_hw_constraint_integer(runtime,
                                    SNDRV_PCM_HW_PARAM_PERIODS);
      if (err < 0)
            return err;

      err = snd_pcm_hw_constraint_step(runtime, 0,
                                    SNDRV_PCM_HW_PARAM_PERIODS, 2);
      if (err < 0)
            return err;

      return 0;
}

/*
 * page callback (needed for mmap)
 */

static struct page *snd_card_saa7134_page(struct snd_pcm_substream *substream,
                              unsigned long offset)
{
      void *pageptr = substream->runtime->dma_area + offset;
      return vmalloc_to_page(pageptr);
}

/*
 * ALSA capture callbacks definition
 */

static struct snd_pcm_ops snd_card_saa7134_capture_ops = {
      .open =                 snd_card_saa7134_capture_open,
      .close =          snd_card_saa7134_capture_close,
      .ioctl =          snd_pcm_lib_ioctl,
      .hw_params =            snd_card_saa7134_hw_params,
      .hw_free =        snd_card_saa7134_hw_free,
      .prepare =        snd_card_saa7134_capture_prepare,
      .trigger =        snd_card_saa7134_capture_trigger,
      .pointer =        snd_card_saa7134_capture_pointer,
      .page =                 snd_card_saa7134_page,
};

/*
 * ALSA PCM setup
 *
 *   Called when initializing the board. Sets up the name and hooks up
 *  the callbacks
 *
 */

static int snd_card_saa7134_pcm(snd_card_saa7134_t *saa7134, int device)
{
      struct snd_pcm *pcm;
      int err;

      if ((err = snd_pcm_new(saa7134->card, "SAA7134 PCM", device, 0, 1, &pcm)) < 0)
            return err;
      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_saa7134_capture_ops);
      pcm->private_data = saa7134;
      pcm->info_flags = 0;
      strcpy(pcm->name, "SAA7134 PCM");
      return 0;
}

#define SAA713x_VOLUME(xname, xindex, addr) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
  .info = snd_saa7134_volume_info, \
  .get = snd_saa7134_volume_get, .put = snd_saa7134_volume_put, \
  .private_value = addr }

static int snd_saa7134_volume_info(struct snd_kcontrol * kcontrol,
                           struct snd_ctl_elem_info * uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
      uinfo->count = 2;
      uinfo->value.integer.min = 0;
      uinfo->value.integer.max = 20;
      return 0;
}

static int snd_saa7134_volume_get(struct snd_kcontrol * kcontrol,
                          struct snd_ctl_elem_value * ucontrol)
{
      snd_card_saa7134_t *chip = snd_kcontrol_chip(kcontrol);
      int addr = kcontrol->private_value;

      ucontrol->value.integer.value[0] = chip->mixer_volume[addr][0];
      ucontrol->value.integer.value[1] = chip->mixer_volume[addr][1];
      return 0;
}

static int snd_saa7134_volume_put(struct snd_kcontrol * kcontrol,
                          struct snd_ctl_elem_value * ucontrol)
{
      snd_card_saa7134_t *chip = snd_kcontrol_chip(kcontrol);
      struct saa7134_dev *dev = chip->dev;

      int change, addr = kcontrol->private_value;
      int left, right;

      left = ucontrol->value.integer.value[0];
      if (left < 0)
            left = 0;
      if (left > 20)
            left = 20;
      right = ucontrol->value.integer.value[1];
      if (right < 0)
            right = 0;
      if (right > 20)
            right = 20;
      spin_lock_irq(&chip->mixer_lock);
      change = 0;
      if (chip->mixer_volume[addr][0] != left) {
            change = 1;
            right = left;
      }
      if (chip->mixer_volume[addr][1] != right) {
            change = 1;
            left = right;
      }
      if (change) {
            switch (dev->pci->device) {
                  case PCI_DEVICE_ID_PHILIPS_SAA7134:
                        switch (addr) {
                              case MIXER_ADDR_TVTUNER:
                                    left = 20;
                                    break;
                              case MIXER_ADDR_LINE1:
                                    saa_andorb(SAA7134_ANALOG_IO_SELECT,  0x10,
                                             (left > 10) ? 0x00 : 0x10);
                                    break;
                              case MIXER_ADDR_LINE2:
                                    saa_andorb(SAA7134_ANALOG_IO_SELECT,  0x20,
                                             (left > 10) ? 0x00 : 0x20);
                                    break;
                        }
                        break;
                  case PCI_DEVICE_ID_PHILIPS_SAA7133:
                  case PCI_DEVICE_ID_PHILIPS_SAA7135:
                        switch (addr) {
                              case MIXER_ADDR_TVTUNER:
                                    left = 20;
                                    break;
                              case MIXER_ADDR_LINE1:
                                    saa_andorb(0x0594,  0x10,
                                             (left > 10) ? 0x00 : 0x10);
                                    break;
                              case MIXER_ADDR_LINE2:
                                    saa_andorb(0x0594,  0x20,
                                             (left > 10) ? 0x00 : 0x20);
                                    break;
                        }
                        break;
            }
            chip->mixer_volume[addr][0] = left;
            chip->mixer_volume[addr][1] = right;
      }
      spin_unlock_irq(&chip->mixer_lock);
      return change;
}

#define SAA713x_CAPSRC(xname, xindex, addr) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
  .info = snd_saa7134_capsrc_info, \
  .get = snd_saa7134_capsrc_get, .put = snd_saa7134_capsrc_put, \
  .private_value = addr }

static int snd_saa7134_capsrc_info(struct snd_kcontrol * kcontrol,
                           struct snd_ctl_elem_info * uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
      uinfo->count = 2;
      uinfo->value.integer.min = 0;
      uinfo->value.integer.max = 1;
      return 0;
}

static int snd_saa7134_capsrc_get(struct snd_kcontrol * kcontrol,
                          struct snd_ctl_elem_value * ucontrol)
{
      snd_card_saa7134_t *chip = snd_kcontrol_chip(kcontrol);
      int addr = kcontrol->private_value;

      spin_lock_irq(&chip->mixer_lock);
      ucontrol->value.integer.value[0] = chip->capture_source[addr][0];
      ucontrol->value.integer.value[1] = chip->capture_source[addr][1];
      spin_unlock_irq(&chip->mixer_lock);

      return 0;
}

static int snd_saa7134_capsrc_put(struct snd_kcontrol * kcontrol,
                          struct snd_ctl_elem_value * ucontrol)
{
      snd_card_saa7134_t *chip = snd_kcontrol_chip(kcontrol);
      int change, addr = kcontrol->private_value;
      int left, right;
      u32 anabar, xbarin;
      int analog_io, rate;
      struct saa7134_dev *dev;

      dev = chip->dev;

      left = ucontrol->value.integer.value[0] & 1;
      right = ucontrol->value.integer.value[1] & 1;
      spin_lock_irq(&chip->mixer_lock);

      change = chip->capture_source[addr][0] != left ||
             chip->capture_source[addr][1] != right;
      chip->capture_source[addr][0] = left;
      chip->capture_source[addr][1] = right;
      dev->dmasound.input=addr;
      spin_unlock_irq(&chip->mixer_lock);


      if (change) {
        switch (dev->pci->device) {

         case PCI_DEVICE_ID_PHILIPS_SAA7134:
            switch (addr) {
                  case MIXER_ADDR_TVTUNER:
                        saa_andorb(SAA7134_AUDIO_FORMAT_CTRL, 0xc0, 0xc0);
                        saa_andorb(SAA7134_SIF_SAMPLE_FREQ,   0x03, 0x00);
                        break;
                  case MIXER_ADDR_LINE1:
                  case MIXER_ADDR_LINE2:
                        analog_io = (MIXER_ADDR_LINE1 == addr) ? 0x00 : 0x08;
                        rate = (32000 == dev->dmasound.rate) ? 0x01 : 0x03;
                        saa_andorb(SAA7134_ANALOG_IO_SELECT,  0x08, analog_io);
                        saa_andorb(SAA7134_AUDIO_FORMAT_CTRL, 0xc0, 0x80);
                        saa_andorb(SAA7134_SIF_SAMPLE_FREQ,   0x03, rate);
                        break;
            }

            break;
         case PCI_DEVICE_ID_PHILIPS_SAA7133:
         case PCI_DEVICE_ID_PHILIPS_SAA7135:
            xbarin = 0x03; // adc
            anabar = 0;
            switch (addr) {
                  case MIXER_ADDR_TVTUNER:
                        xbarin = 0; // Demodulator
                        anabar = 2; // DACs
                        break;
                  case MIXER_ADDR_LINE1:
                        anabar = 0;  // aux1, aux1
                        break;
                  case MIXER_ADDR_LINE2:
                        anabar = 9;  // aux2, aux2
                        break;
            }

            /* output xbar always main channel */
            saa_dsp_writel(dev, SAA7133_DIGITAL_OUTPUT_SEL1, 0xbbbb10);

            if (left || right) { // We've got data, turn the input on
              saa_dsp_writel(dev, SAA7133_DIGITAL_INPUT_XBAR1, xbarin);
              saa_writel(SAA7133_ANALOG_IO_SELECT, anabar);
            } else {
              saa_dsp_writel(dev, SAA7133_DIGITAL_INPUT_XBAR1, 0);
              saa_writel(SAA7133_ANALOG_IO_SELECT, 0);
            }
            break;
        }
      }

      return change;
}

static struct snd_kcontrol_new snd_saa7134_controls[] = {
SAA713x_VOLUME("Video Volume", 0, MIXER_ADDR_TVTUNER),
SAA713x_CAPSRC("Video Capture Switch", 0, MIXER_ADDR_TVTUNER),
SAA713x_VOLUME("Line Volume", 1, MIXER_ADDR_LINE1),
SAA713x_CAPSRC("Line Capture Switch", 1, MIXER_ADDR_LINE1),
SAA713x_VOLUME("Line Volume", 2, MIXER_ADDR_LINE2),
SAA713x_CAPSRC("Line Capture Switch", 2, MIXER_ADDR_LINE2),
};

/*
 * ALSA mixer setup
 *
 *   Called when initializing the board. Sets up the name and hooks up
 *  the callbacks
 *
 */

static int snd_card_saa7134_new_mixer(snd_card_saa7134_t * chip)
{
      struct snd_card *card = chip->card;
      unsigned int idx;
      int err;

      snd_assert(chip != NULL, return -EINVAL);
      strcpy(card->mixername, "SAA7134 Mixer");

      for (idx = 0; idx < ARRAY_SIZE(snd_saa7134_controls); idx++) {
            if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_saa7134_controls[idx], chip))) < 0)
                  return err;
      }
      return 0;
}

static void snd_saa7134_free(struct snd_card * card)
{
      snd_card_saa7134_t *chip = card->private_data;

      if (chip->dev->dmasound.priv_data == NULL)
            return;

      if (chip->irq >= 0) {
            synchronize_irq(chip->irq);
            free_irq(chip->irq, &chip->dev->dmasound);
      }

      chip->dev->dmasound.priv_data = NULL;

}

/*
 * ALSA initialization
 *
 *   Called by the init routine, once for each saa7134 device present,
 *  it creates the basic structures and registers the ALSA devices
 *
 */

static int alsa_card_saa7134_create(struct saa7134_dev *dev, int devnum)
{

      struct snd_card *card;
      snd_card_saa7134_t *chip;
      int err;


      if (devnum >= SNDRV_CARDS)
            return -ENODEV;
      if (!enable[devnum])
            return -ENODEV;

      card = snd_card_new(index[devnum], id[devnum], THIS_MODULE, sizeof(snd_card_saa7134_t));

      if (card == NULL)
            return -ENOMEM;

      strcpy(card->driver, "SAA7134");

      /* Card "creation" */

      card->private_free = snd_saa7134_free;
      chip = (snd_card_saa7134_t *) card->private_data;

      spin_lock_init(&chip->lock);
      spin_lock_init(&chip->mixer_lock);

      chip->dev = dev;

      chip->card = card;

      chip->pci = dev->pci;
      chip->iobase = pci_resource_start(dev->pci, 0);


      err = request_irq(dev->pci->irq, saa7134_alsa_irq,
                        IRQF_SHARED | IRQF_DISABLED, dev->name,
                        (void*) &dev->dmasound);

      if (err < 0) {
            printk(KERN_ERR "%s: can't get IRQ %d for ALSA\n",
                  dev->name, dev->pci->irq);
            goto __nodev;
      }

      chip->irq = dev->pci->irq;

      mutex_init(&dev->dmasound.lock);

      if ((err = snd_card_saa7134_new_mixer(chip)) < 0)
            goto __nodev;

      if ((err = snd_card_saa7134_pcm(chip, 0)) < 0)
            goto __nodev;

      snd_card_set_dev(card, &chip->pci->dev);

      /* End of "creation" */

      strcpy(card->shortname, "SAA7134");
      sprintf(card->longname, "%s at 0x%lx irq %d",
            chip->dev->name, chip->iobase, chip->irq);

      printk(KERN_INFO "%s/alsa: %s registered as card %d\n",dev->name,card->longname,index[devnum]);

      if ((err = snd_card_register(card)) == 0) {
            snd_saa7134_cards[devnum] = card;
            return 0;
      }

__nodev:
      snd_card_free(card);
      return err;
}


static int alsa_device_init(struct saa7134_dev *dev)
{
      dev->dmasound.priv_data = dev;
      alsa_card_saa7134_create(dev,dev->nr);
      return 1;
}

static int alsa_device_exit(struct saa7134_dev *dev)
{

      snd_card_free(snd_saa7134_cards[dev->nr]);
      snd_saa7134_cards[dev->nr] = NULL;
      return 1;
}

/*
 * Module initializer
 *
 * Loops through present saa7134 cards, and assigns an ALSA device
 * to each one
 *
 */

static int saa7134_alsa_init(void)
{
      struct saa7134_dev *dev = NULL;
      struct list_head *list;

      saa7134_dmasound_init = alsa_device_init;
      saa7134_dmasound_exit = alsa_device_exit;

      printk(KERN_INFO "saa7134 ALSA driver for DMA sound loaded\n");

      list_for_each(list,&saa7134_devlist) {
            dev = list_entry(list, struct saa7134_dev, devlist);
            alsa_device_init(dev);
      }

      if (dev == NULL)
            printk(KERN_INFO "saa7134 ALSA: no saa7134 cards found\n");

      return 0;

}

/*
 * Module destructor
 */

static void saa7134_alsa_exit(void)
{
      int idx;

      for (idx = 0; idx < SNDRV_CARDS; idx++) {
            snd_card_free(snd_saa7134_cards[idx]);
      }

      saa7134_dmasound_init = NULL;
      saa7134_dmasound_exit = NULL;
      printk(KERN_INFO "saa7134 ALSA driver for DMA sound unloaded\n");

      return;
}

/* We initialize this late, to make sure the sound system is up and running */
late_initcall(saa7134_alsa_init);
module_exit(saa7134_alsa_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ricardo Cerqueira");




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