text: /*
   *  Driver for the Conexant CX25821 PCIe bridge
   *
   *  Copyright (C) 2009 Conexant Systems Inc.
   *  Authors  <shu.lin@conexant.com>, <hiep.huynh@conexant.com>
   *	Based on SAA713x ALSA driver and CX88 driver
   *
   *   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/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 "cx25821.h"
  #include "cx25821-reg.h"
  
  #define AUDIO_SRAM_CHANNEL	SRAM_CH08
  
  #define dprintk(level,fmt, arg...)	if (debug >= level) \
  	printk(KERN_INFO "%s/1: " fmt, chip->dev->name , ## arg)
  
  #define dprintk_core(level,fmt, arg...)	if (debug >= level) \
  	printk(KERN_DEBUG "%s/1: " fmt, chip->dev->name , ## arg)
  
  /****************************************************************************
  	Data type declarations - Can be moded to a header file later
   ****************************************************************************/
  
  static struct snd_card *snd_cx25821_cards[SNDRV_CARDS];
  static int devno;
  
  struct cx25821_audio_dev {
  	struct cx25821_dev *dev;
  	struct cx25821_dmaqueue q;
  
  	/* pci i/o */
  	struct pci_dev *pci;
  
  	/* audio controls */
  	int irq;
  
  	struct snd_card *card;
  
  	unsigned long iobase;
  	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 cx25821_buffer *buf;
  
  	struct snd_pcm_substream *substream;
  };
  typedef struct cx25821_audio_dev snd_cx25821_card_t;
  
  
  /****************************************************************************
  			Module global static vars
   ****************************************************************************/
  
  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(enable, bool, NULL, 0444);
  MODULE_PARM_DESC(enable, "Enable cx25821 soundcard. default enabled.");
  
  module_param_array(index, int, NULL, 0444);
  MODULE_PARM_DESC(index, "Index value for cx25821 capture interface(s).");
  
  /****************************************************************************
  				Module macros
   ****************************************************************************/
  
  MODULE_DESCRIPTION("ALSA driver module for cx25821 based capture cards");
  MODULE_AUTHOR("Hiep Huynh");
  MODULE_LICENSE("GPL");
  MODULE_SUPPORTED_DEVICE("{{Conexant,25821}");	//"{{Conexant,23881},"
  
  static unsigned int debug;
  module_param(debug, int, 0644);
  MODULE_PARM_DESC(debug, "enable debug messages");
  
  /****************************************************************************
  			Module specific funtions
   ****************************************************************************/
  /* Constants taken from cx88-reg.h */
  #define AUD_INT_DN_RISCI1       (1 <<  0)
  #define AUD_INT_UP_RISCI1       (1 <<  1)
  #define AUD_INT_RDS_DN_RISCI1   (1 <<  2)
  #define AUD_INT_DN_RISCI2       (1 <<  4)	/* yes, 3 is skipped */
  #define AUD_INT_UP_RISCI2       (1 <<  5)
  #define AUD_INT_RDS_DN_RISCI2   (1 <<  6)
  #define AUD_INT_DN_SYNC         (1 << 12)
  #define AUD_INT_UP_SYNC         (1 << 13)
  #define AUD_INT_RDS_DN_SYNC     (1 << 14)
  #define AUD_INT_OPC_ERR         (1 << 16)
  #define AUD_INT_BER_IRQ         (1 << 20)
  #define AUD_INT_MCHG_IRQ        (1 << 21)
  #define GP_COUNT_CONTROL_RESET	0x3
  
  #define PCI_MSK_AUD_EXT   (1 <<  4)
  #define PCI_MSK_AUD_INT   (1 <<  3)
  /*
   * BOARD Specific: Sets audio DMA
   */
  
  static int _cx25821_start_audio_dma(snd_cx25821_card_t * chip)
  {
  	struct cx25821_buffer *buf = chip->buf;
  	struct cx25821_dev *dev = chip->dev;
  	struct sram_channel *audio_ch =
  	    &cx25821_sram_channels[AUDIO_SRAM_CHANNEL];
  	u32 tmp = 0;
  
  	// enable output on the GPIO 0 for the MCLK ADC (Audio)
  	cx25821_set_gpiopin_direction(chip->dev, 0, 0);
  
  	/* Make sure RISC/FIFO are off before changing FIFO/RISC settings */
  	cx_clear(AUD_INT_DMA_CTL,
  		 FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
  
  	/* setup fifo + format - out channel */
  	cx25821_sram_channel_setup_audio(chip->dev, audio_ch, buf->bpl,
  					 buf->risc.dma);
  
  	/* sets bpl size */
  	cx_write(AUD_A_LNGTH, buf->bpl);
  
  	/* reset counter */
  	cx_write(AUD_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);	//GP_COUNT_CONTROL_RESET = 0x3
  	atomic_set(&chip->count, 0);
  
  	//Set the input mode to 16-bit
  	tmp = cx_read(AUD_A_CFG);
  	cx_write(AUD_A_CFG,
  		 tmp | FLD_AUD_DST_PK_MODE | FLD_AUD_DST_ENABLE |
  		 FLD_AUD_CLK_ENABLE);
  
  	//printk(KERN_INFO "DEBUG: Start audio DMA, %d B/line, cmds_start(0x%x)= %d lines/FIFO, %d periods, %d "
  	//      "byte buffer\n", buf->bpl, audio_ch->cmds_start, cx_read(audio_ch->cmds_start + 12)>>1,
  	//      chip->num_periods, buf->bpl * chip->num_periods);
  
  	/* Enables corresponding bits at AUD_INT_STAT */
  	cx_write(AUD_A_INT_MSK,
  		 FLD_AUD_DST_RISCI1 | FLD_AUD_DST_OF | FLD_AUD_DST_SYNC |
  		 FLD_AUD_DST_OPC_ERR);
  
  	/* Clean any pending interrupt bits already set */
  	cx_write(AUD_A_INT_STAT, ~0);
  
  	/* enable audio irqs */
  	cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT);
  
  	// Turn on audio downstream fifo and risc enable 0x101
  	tmp = cx_read(AUD_INT_DMA_CTL);
  	cx_set(AUD_INT_DMA_CTL,
  	       tmp | (FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN));
  
  	mdelay(100);
  	return 0;
  }
  
  /*
   * BOARD Specific: Resets audio DMA
   */
  static int _cx25821_stop_audio_dma(snd_cx25821_card_t * chip)
  {
  	struct cx25821_dev *dev = chip->dev;
  
  	/* stop dma */
  	cx_clear(AUD_INT_DMA_CTL,
  		 FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
  
  	/* disable irqs */
  	cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT);
  	cx_clear(AUD_A_INT_MSK,
  		 AUD_INT_OPC_ERR | AUD_INT_DN_SYNC | AUD_INT_DN_RISCI2 |
  		 AUD_INT_DN_RISCI1);
  
  	return 0;
  }
  
  #define MAX_IRQ_LOOP 50
  
  /*
   * BOARD Specific: IRQ dma bits
   */
  static char *cx25821_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 cx25821_aud_irq(snd_cx25821_card_t * chip, u32 status, u32 mask)
  {
  	struct cx25821_dev *dev = chip->dev;
  
  	if (0 == (status & mask)) {
  		return;
  	}
  
  	cx_write(AUD_A_INT_STAT, status);
  	if (debug > 1 || (status & mask & ~0xff))
  		cx25821_print_irqbits(dev->name, "irq aud",
  				      cx25821_aud_irqs,
  				      ARRAY_SIZE(cx25821_aud_irqs), status,
  				      mask);
  
  	/* risc op code error */
  	if (status & AUD_INT_OPC_ERR) {
  		printk(KERN_WARNING "WARNING %s/1: Audio risc op code error\n",
  		       dev->name);
  
  		cx_clear(AUD_INT_DMA_CTL,
  			 FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
  		cx25821_sram_channel_dump_audio(dev,
  						&cx25821_sram_channels
  						[AUDIO_SRAM_CHANNEL]);
  	}
  	if (status & AUD_INT_DN_SYNC) {
  		printk(KERN_WARNING "WARNING %s: Downstream sync error!\n",
  		       dev->name);
  		cx_write(AUD_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
  		return;
  	}
  
  	/* risc1 downstream */
  	if (status & AUD_INT_DN_RISCI1) {
  		atomic_set(&chip->count, cx_read(AUD_A_GPCNT));
  		snd_pcm_period_elapsed(chip->substream);
  	}
  }
  
  /*
   * BOARD Specific: Handles IRQ calls
   */
  static irqreturn_t cx25821_irq(int irq, void *dev_id)
  {
  	snd_cx25821_card_t *chip = dev_id;
  	struct cx25821_dev *dev = chip->dev;
  	u32 status, pci_status;
  	u32 audint_status, audint_mask;
  	int loop, handled = 0;
  	int audint_count = 0;
  
  	audint_status = cx_read(AUD_A_INT_STAT);
  	audint_mask = cx_read(AUD_A_INT_MSK);
  	audint_count = cx_read(AUD_A_GPCNT);
  	status = cx_read(PCI_INT_STAT);
  
  	for (loop = 0; loop < 1; loop++) {
  		status = cx_read(PCI_INT_STAT);
  		if (0 == status) {
  			status = cx_read(PCI_INT_STAT);
  			audint_status = cx_read(AUD_A_INT_STAT);
  			audint_mask = cx_read(AUD_A_INT_MSK);
  
  			if (status) {
  				handled = 1;
  				cx_write(PCI_INT_STAT, status);
  
  				cx25821_aud_irq(chip, audint_status,
  						audint_mask);
  				break;
  			} else
  				goto out;
  		}
  
  		handled = 1;
  		cx_write(PCI_INT_STAT, status);
  
  		cx25821_aud_irq(chip, audint_status, audint_mask);
  	}
  
  	pci_status = cx_read(PCI_INT_STAT);
  
  	if (handled)
  		cx_write(PCI_INT_STAT, pci_status);
  
        out:
  	return IRQ_RETVAL(handled);
  }
  
  static int dsp_buffer_free(snd_cx25821_card_t * chip)
  {
  	BUG_ON(!chip->dma_size);
  
  	dprintk(2, "Freeing buffer\n");
  	videobuf_sg_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	384
  static struct snd_pcm_hardware snd_cx25821_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 / 3,
  	.period_bytes_max = DEFAULT_FIFO_SIZE / 3,
  	.periods_min = 1,
  	.periods_max = AUDIO_LINE_SIZE,
  	.buffer_bytes_max = (AUDIO_LINE_SIZE * AUDIO_LINE_SIZE),	//128*128 = 16384 = 1024 * 16
  };
  
  /*
   * audio pcm capture open callback
   */
  static int snd_cx25821_pcm_open(struct snd_pcm_substream *substream)
  {
  	snd_cx25821_card_t *chip = snd_pcm_substream_chip(substream);
  	struct snd_pcm_runtime *runtime = substream->runtime;
  	int err;
  	unsigned int bpl = 0;
  
  	if (!chip) {
  		printk(KERN_ERR "DEBUG: cx25821 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_cx25821_digital_hw;
  
  	if (cx25821_sram_channels[AUDIO_SRAM_CHANNEL].fifo_size !=
  	    DEFAULT_FIFO_SIZE) {
  		bpl = cx25821_sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 3;	//since there are 3 audio Clusters
  		bpl &= ~7;	/* must be multiple of 8 */
  
  		if (bpl > AUDIO_LINE_SIZE) {
  			bpl = AUDIO_LINE_SIZE;
  		}
  		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_cx25821_close(struct snd_pcm_substream *substream)
  {
  	return 0;
  }
  
  /*
   * hw_params callback
   */
  static int snd_cx25821_hw_params(struct snd_pcm_substream *substream,
  				 struct snd_pcm_hw_params *hw_params)
  {
  	snd_cx25821_card_t *chip = snd_pcm_substream_chip(substream);
  	struct videobuf_dmabuf *dma;
  
  	struct cx25821_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 = videobuf_sg_alloc(sizeof(*buf));
  	if (NULL == buf)
  		return -ENOMEM;
  
  	if (chip->period_size > AUDIO_LINE_SIZE) {
  		chip->period_size = AUDIO_LINE_SIZE;
  	}
  
  	buf->vb.memory = V4L2_MEMORY_MMAP;
  	buf->vb.field = V4L2_FIELD_NONE;
  	buf->vb.width = chip->period_size;
  	buf->bpl = chip->period_size;
  	buf->vb.height = chip->num_periods;
  	buf->vb.size = chip->dma_size;
  
  	dma = videobuf_to_dma(&buf->vb);
  	videobuf_dma_init(dma);
  
  	ret = videobuf_dma_init_kernel(dma, PCI_DMA_FROMDEVICE,
  				       (PAGE_ALIGN(buf->vb.size) >>
  					PAGE_SHIFT));
  	if (ret < 0)
  		goto error;
  
  	ret = videobuf_sg_dma_map(&chip->pci->dev, dma);
  	if (ret < 0)
  		goto error;
  
  	ret =
  	    cx25821_risc_databuffer_audio(chip->pci, &buf->risc, dma->sglist,
  					  buf->vb.width, buf->vb.height, 1);
  	if (ret < 0) {
  		printk(KERN_INFO
  		       "DEBUG: ERROR after cx25821_risc_databuffer_audio() \n");
  		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);
  	buf->risc.jmp[2] = cpu_to_le32(0);	/* bits 63-32 */
  
  	buf->vb.state = VIDEOBUF_PREPARED;
  
  	chip->buf = buf;
  	chip->dma_risc = dma;
  
  	substream->runtime->dma_area = chip->dma_risc->vmalloc;
  	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_cx25821_hw_free(struct snd_pcm_substream *substream)
  {
  	snd_cx25821_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_cx25821_prepare(struct snd_pcm_substream *substream)
  {
  	return 0;
  }
  
  /*
   * trigger callback
   */
  static int snd_cx25821_card_trigger(struct snd_pcm_substream *substream,
  				    int cmd)
  {
  	snd_cx25821_card_t *chip = snd_pcm_substream_chip(substream);
  	int err = 0;
  
  	/* Local interrupts are already disabled by ALSA */
  	spin_lock(&chip->reg_lock);
  
  	switch (cmd) {
  	case SNDRV_PCM_TRIGGER_START:
  		err = _cx25821_start_audio_dma(chip);
  		break;
  	case SNDRV_PCM_TRIGGER_STOP:
  		err = _cx25821_stop_audio_dma(chip);
  		break;
  	default:
  		err = -EINVAL;
  		break;
  	}
  
  	spin_unlock(&chip->reg_lock);
  
  	return err;
  }
  
  /*
   * pointer callback
   */
  static snd_pcm_uframes_t snd_cx25821_pointer(struct snd_pcm_substream
  					     *substream)
  {
  	snd_cx25821_card_t *chip = snd_pcm_substream_chip(substream);
  	struct snd_pcm_runtime *runtime = substream->runtime;
  	u16 count;
  
  	count = atomic_read(&chip->count);
  
  	return runtime->period_size * (count & (runtime->periods - 1));
  }
  
  /*
   * page callback (needed for mmap)
   */
  static struct page *snd_cx25821_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_cx25821_pcm_ops = {
  	.open = snd_cx25821_pcm_open,
  	.close = snd_cx25821_close,
  	.ioctl = snd_pcm_lib_ioctl,
  	.hw_params = snd_cx25821_hw_params,
  	.hw_free = snd_cx25821_hw_free,
  	.prepare = snd_cx25821_prepare,
  	.trigger = snd_cx25821_card_trigger,
  	.pointer = snd_cx25821_pointer,
  	.page = snd_cx25821_page,
  };
  
  /*
   * ALSA create a PCM device:  Called when initializing the board. Sets up the name and hooks up
   *  the callbacks
   */
  static int snd_cx25821_pcm(snd_cx25821_card_t * chip, int device, char *name)
  {
  	struct snd_pcm *pcm;
  	int err;
  
  	err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm);
  	if (err < 0) {
  		printk(KERN_INFO "ERROR: FAILED snd_pcm_new() in %s\n",
  		       __func__);
  		return err;
  	}
  	pcm->private_data = chip;
  	pcm->info_flags = 0;
  	strcpy(pcm->name, name);
  	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx25821_pcm_ops);
  
  	return 0;
  }
  
  /****************************************************************************
  			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 struct pci_device_id cx25821_audio_pci_tbl[] __devinitdata = {
  	{0x14f1, 0x0920, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  	{0,}
  };
  
  MODULE_DEVICE_TABLE(pci, cx25821_audio_pci_tbl);
  
  /*
   * Not used in the function snd_cx25821_dev_free so removing
   * from the file.
   */
  /*
  static int snd_cx25821_free(snd_cx25821_card_t *chip)
  {
  	if (chip->irq >= 0)
  		free_irq(chip->irq, chip);
  
  	cx25821_dev_unregister(chip->dev);
  	pci_disable_device(chip->pci);
  
  	return 0;
  }
  */
  
  /*
   * Component Destructor
   */
  static void snd_cx25821_dev_free(struct snd_card *card)
  {
  	snd_cx25821_card_t *chip = card->private_data;
  
  	//snd_cx25821_free(chip);
  	snd_card_free(chip->card);
  }
  
  /*
   * Alsa Constructor - Component probe
   */
  static int cx25821_audio_initdev(struct cx25821_dev *dev)
  {
  	struct snd_card *card;
  	snd_cx25821_card_t *chip;
  	int err;
  
  	if (devno >= SNDRV_CARDS) {
  		printk(KERN_INFO "DEBUG ERROR: devno >= SNDRV_CARDS %s\n",
  		       __func__);
  		return (-ENODEV);
  	}
  
  	if (!enable[devno]) {
  		++devno;
  		printk(KERN_INFO "DEBUG ERROR: !enable[devno] %s\n", __func__);
  		return (-ENOENT);
  	}
  
  	err = snd_card_create(index[devno], id[devno], THIS_MODULE,
  			 sizeof(snd_cx25821_card_t), &card);
  	if (err < 0) {
  		printk(KERN_INFO
  		       "DEBUG ERROR: cannot create snd_card_new in %s\n",
  		       __func__);
  		return err;
  	}
  
  	strcpy(card->driver, "cx25821");
  
  	/* Card "creation" */
  	card->private_free = snd_cx25821_dev_free;
  	chip = (snd_cx25821_card_t *) card->private_data;
  	spin_lock_init(&chip->reg_lock);
  
  	chip->dev = dev;
  	chip->card = card;
  	chip->pci = dev->pci;
  	chip->iobase = pci_resource_start(dev->pci, 0);
  
  	chip->irq = dev->pci->irq;
  
  	err = request_irq(dev->pci->irq, cx25821_irq,
  			  IRQF_SHARED | IRQF_DISABLED, chip->dev->name, chip);
  
  	if (err < 0) {
  		printk(KERN_ERR "ERROR %s: can't get IRQ %d for ALSA\n",
  		       chip->dev->name, dev->pci->irq);
  		goto error;
  	}
  
  	if ((err = snd_cx25821_pcm(chip, 0, "cx25821 Digital")) < 0) {
  		printk(KERN_INFO
  		       "DEBUG ERROR: cannot create snd_cx25821_pcm %s\n",
  		       __func__);
  		goto error;
  	}
  
  	snd_card_set_dev(card, &chip->pci->dev);
  
  	strcpy(card->shortname, "cx25821");
  	sprintf(card->longname, "%s at 0x%lx irq %d", chip->dev->name,
  		chip->iobase, chip->irq);
  	strcpy(card->mixername, "CX25821");
  
  	printk(KERN_INFO "%s/%i: ALSA support for cx25821 boards\n",
  	       card->driver, devno);
  
  	err = snd_card_register(card);
  	if (err < 0) {
  		printk(KERN_INFO "DEBUG ERROR: cannot register sound card %s\n",
  		       __func__);
  		goto error;
  	}
  
  	snd_cx25821_cards[devno] = card;
  
  	devno++;
  	return 0;
  
        error:
  	snd_card_free(card);
  	return err;
  }
  
  /****************************************************************************
  				LINUX MODULE INIT
   ****************************************************************************/
  static void cx25821_audio_fini(void)
  {
  	snd_card_free(snd_cx25821_cards[0]);
  }
  
  /*
   * Module initializer
   *
   * Loops through present saa7134 cards, and assigns an ALSA device
   * to each one
   *
   */
  static int cx25821_alsa_init(void)
  {
  	struct cx25821_dev *dev = NULL;
  	struct list_head *list;
  
  	list_for_each(list, &cx25821_devlist) {
  		dev = list_entry(list, struct cx25821_dev, devlist);
  		cx25821_audio_initdev(dev);
  	}
  
  	if (dev == NULL)
  		printk(KERN_INFO
  		       "cx25821 ERROR ALSA: no cx25821 cards found\n");
  
  	return 0;
  
  }
  
  late_initcall(cx25821_alsa_init);
  module_exit(cx25821_audio_fini);
  
  /* ----------------------------------------------------------- */
  /*
   * Local variables:
   * c-basic-offset: 8
   * End:
   */
  