V4L/DVB (3293): Added digital support for cx88 (cx88-alsa)

- This module is co-authored by  Ricardo Cerqueira <v4l@cerqueira.org>.

- Added digital audio support for cx88-based boards that have function
  01 enabled. These boards can be identified by having PCI id 1471:8801
  or 1471:8811.

- Increased DMA buffer from 512 to 4096 seems to fix audio distortion.

- Existing audio DMA uses conflict with cx88-alsa. Should be disabled when
  cx88-alsa module is compiled.
Signed-off-by: Ricardo Cerqueira <v4l@cerqueira.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>

drivers/media/video/cx88/Kconfig

@@ -29,6 +29,21 @@ config VIDEO_CX88_DVB
 	  You must also select one or more DVB/ATSC demodulators.
 	  If you are unsure which you need, choose all of them.
 
+config VIDEO_CX88_ALSA
+	tristate "ALSA DMA audio support"
+	depends on VIDEO_CX88 && SND
+	select SND_PCM_OSS
+	---help---
+	  This is a video4linux driver for direct (DMA) audio on
+	  Conexant 2388x based TV cards.
+	  It only works with boards with function 01 enabled.
+	  To check if your board supports, use lspci -n.
+	  If supported, you should see 1471:8801 or 1471:8811
+	  PCI device.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called cx88-alsa.
+
 config VIDEO_CX88_DVB_ALL_FRONTENDS
 	bool "Build all supported frontends for cx2388x based TV cards"
 	default y

drivers/media/video/cx88/cx88-alsa.c

+/*
+ *
+ *  Support for audio capture
+ *  PCI function #1 of the cx2388x.
+ *
+ *    (c) 2005,2006 Ricardo Cerqueira <v4l@cerqueira.org>
+ *    (c) 2005 Mauro Carvalho Chehab <mchehab@brturbo.com.br>
+ *    Based on a dummy cx88 module by Gerd Knorr <kraxel@bytesex.org>
+ *    Based on dummy.c by Jaroslav Kysela <perex@suse.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 <asm/delay.h>
+#include <sound/driver.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/control.h>
+#include <sound/initval.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
+ ****************************************************************************/
+
+/* These can be replaced after done */
+#define MIXER_ADDR_LAST MAX_CX88_INPUT
+
+struct cx88_audio_dev {
+	struct cx88_core           *core;
+	struct cx88_dmaqueue       q;
+
+	/* pci i/o */
+	struct pci_dev             *pci;
+	unsigned char              pci_rev,pci_lat;
+
+	/* audio controls */
+	int                        irq;
+
+	snd_card_t                 *card;
+
+	spinlock_t                 reg_lock;
+
+	unsigned int               dma_size;
+	unsigned int               period_size;
+	unsigned int               num_periods;
+
+	struct videobuf_dmabuf dma_risc;
+
+	int                        mixer_volume[MIXER_ADDR_LAST+1][2];
+	int                        capture_source[MIXER_ADDR_LAST+1][2];
+
+	long int read_count;
+	long int read_offset;
+
+	struct cx88_buffer   *buf;
+
+	long opened;
+	snd_pcm_substream_t *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 char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;	/* ID for this card */
+static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 1};
+static snd_card_t *snd_cx88_cards[SNDRV_CARDS];
+
+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@brturbo.com.br>");
+MODULE_LICENSE("GPL");
+MODULE_SUPPORTED_DEVICE("{{Conexant,23881},"
+			"{{Conexant,23882},"
+			"{{Conexant,23883}");
+static unsigned int debug = 0;
+module_param(debug,int,0644);
+MODULE_PARM_DESC(debug,"enable debug messages");
+
+/****************************************************************************
+			Module specific funtions
+ ****************************************************************************/
+
+/*
+ * BOARD Specific: Sets audio DMA
+ */
+
+int _cx88_start_audio_dma(snd_cx88_card_t *chip)
+{
+	struct cx88_buffer   *buf = chip->buf;
+	struct cx88_core *core=chip->core;
+	struct sram_channel *audio_ch = &cx88_sram_channels[SRAM_CH25];
+
+
+	dprintk(1, "Starting audio DMA for %i bytes/line and %i (%i) lines at address %08x\n",buf->bpl, chip->num_periods, audio_ch->fifo_size / buf->bpl, audio_ch->fifo_start);
+
+	/* setup fifo + format - out channel */
+	cx88_sram_channel_setup(chip->core, &cx88_sram_channels[SRAM_CH25],
+				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);
+
+	dprintk(1,"Enabling IRQ, setting mask from 0x%x to 0x%x\n",chip->core->pci_irqmask,(chip->core->pci_irqmask | 0x02));
+	/* enable irqs */
+	cx_set(MO_PCI_INTMSK, chip->core->pci_irqmask | 0x02);
+
+
+	/* Enables corresponding bits at AUD_INT_STAT */
+	cx_write(MO_AUD_INTMSK,
+			(1<<16)|
+			(1<<12)|
+			(1<<4)|
+			(1<<0)
+			);
+
+	/* 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, &cx88_sram_channels[SRAM_CH25]);
+
+	return 0;
+}
+
+/*
+ * BOARD Specific: Resets audio DMA
+ */
+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, 0x02);
+	cx_clear(MO_AUD_INTMSK,
+			(1<<16)|
+			(1<<12)|
+			(1<<4)|
+			(1<<0)
+			);
+
+	if (debug)
+		cx88_sram_channel_dump(chip->core, &cx88_sram_channels[SRAM_CH25]);
+
+	return 0;
+}
+
+#define MAX_IRQ_LOOP 10
+
+/*
+ * BOARD Specific: IRQ dma bits
+ */
+static 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;
+	u32 count;
+
+	status = cx_read(MO_AUD_INTSTAT);
+	mask   = cx_read(MO_AUD_INTMSK);
+	if (0 == (status & mask)) {
+		spin_unlock(&chip->reg_lock);
+		return;
+	}
+	cx_write(MO_AUD_INTSTAT, status);
+	if (debug > 1  ||  (status & mask & ~0xff))
+		cx88_print_irqbits(core->name, "irq aud",
+				   cx88_aud_irqs, status, mask);
+	/* risc op code error */
+	if (status & (1 << 16)) {
+		printk(KERN_WARNING "%s/0: audio risc op code error\n",core->name);
+		cx_clear(MO_AUD_DMACNTRL, 0x11);
+		cx88_sram_channel_dump(core, &cx88_sram_channels[SRAM_CH25]);
+	}
+
+	/* risc1 downstream */
+	if (status & 0x01) {
+		spin_lock(&chip->reg_lock);
+		count = cx_read(MO_AUDD_GPCNT);
+		spin_unlock(&chip->reg_lock);
+		if (chip->read_count == 0)
+			chip->read_count += chip->dma_size;
+	}
+
+	if  (chip->read_count >= chip->period_size) {
+		dprintk(2, "Elapsing period\n");
+		snd_pcm_period_elapsed(chip->substream);
+	}
+
+	dprintk(3,"Leaving audio IRQ handler...\n");
+
+	/* FIXME: Any other status should deserve a special handling? */
+}
+
+/*
+ * BOARD Specific: Handles IRQ calls
+ */
+static irqreturn_t cx8801_irq(int irq, void *dev_id, struct pt_regs *regs)
+{
+	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 | 0x02);
+		if (0 == status)
+			goto out;
+		dprintk( 3, "cx8801_irq\n" );
+		dprintk( 3, "    loop: %d/%d\n", loop, MAX_IRQ_LOOP );
+		dprintk( 3, "    status: %d\n", status );
+		handled = 1;
+		cx_write(MO_PCI_INTSTAT, status);
+
+		if (status & 0x02)
+		{
+			dprintk( 2, "    ALSA IRQ handling\n" );
+			cx8801_aud_irq(chip);
+		}
+	};
+
+	if (MAX_IRQ_LOOP == loop) {
+		dprintk( 0, "clearing mask\n" );
+		dprintk(1,"%s/0: irq loop -- clearing mask\n",
+		       core->name);
+		cx_clear(MO_PCI_INTMSK,0x02);
+	}
+
+ 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_pci_unmap(chip->pci, &chip->dma_risc);
+	videobuf_dma_free(&chip->dma_risc);
+	btcx_riscmem_free(chip->pci,&chip->buf->risc);
+	kfree(chip->buf);
+
+	chip->dma_size = 0;
+
+       return 0;
+}
+
+/****************************************************************************
+				ALSA PCM Interface
+ ****************************************************************************/
+
+/*
+ * Digital hardware definition
+ */
+static snd_pcm_hardware_t 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 = 1,
+	.channels_max = 2,
+	.buffer_bytes_max = (2*2048),
+	.period_bytes_min = 256,
+	.period_bytes_max = 2048,
+	.periods_min = 2,
+	.periods_max = 16,
+};
+
+/*
+ * audio pcm capture runtime free
+ */
+static void snd_card_cx88_runtime_free(snd_pcm_runtime_t *runtime)
+{
+}
+/*
+ * audio pcm capture open callback
+ */
+static int snd_cx88_pcm_open(snd_pcm_substream_t *substream)
+{
+	snd_cx88_card_t *chip = snd_pcm_substream_chip(substream);
+	snd_pcm_runtime_t *runtime = substream->runtime;
+	int err;
+
+	if (test_and_set_bit(0, &chip->opened))
+		return -EBUSY;
+
+	err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
+	if (err < 0)
+		goto _error;
+
+	chip->substream = substream;
+
+	chip->read_count = 0;
+	chip->read_offset = 0;
+
+	runtime->private_free = snd_card_cx88_runtime_free;
+	runtime->hw = snd_cx88_digital_hw;
+
+	return 0;
+_error:
+	dprintk(1,"Error opening PCM!\n");
+	clear_bit(0, &chip->opened);
+	smp_mb__after_clear_bit();
+	return err;
+}
+
+/*
+ * audio close callback
+ */
+static int snd_cx88_close(snd_pcm_substream_t *substream)
+{
+	snd_cx88_card_t *chip = snd_pcm_substream_chip(substream);
+
+	clear_bit(0, &chip->opened);
+	smp_mb__after_clear_bit();
+
+	return 0;
+}
+
+/*
+ * hw_params callback
+ */
+static int snd_cx88_hw_params(snd_pcm_substream_t * substream,
+				 snd_pcm_hw_params_t * hw_params)
+{
+	snd_cx88_card_t *chip = snd_pcm_substream_chip(substream);
+	struct cx88_buffer *buf;
+
+	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);
+
+	dprintk(1,"Setting buffer\n");
+
+	buf = kmalloc(sizeof(*buf),GFP_KERNEL);
+	if (NULL == buf)
+		return -ENOMEM;
+	memset(buf,0,sizeof(*buf));
+
+
+	buf->vb.memory = V4L2_MEMORY_MMAP;
+	buf->vb.width  = chip->period_size;
+	buf->vb.height = chip->num_periods;
+	buf->vb.size   = chip->dma_size;
+	buf->vb.field  = V4L2_FIELD_NONE;
+
+	videobuf_dma_init(&buf->vb.dma);
+	videobuf_dma_init_kernel(&buf->vb.dma,PCI_DMA_FROMDEVICE,
+			(PAGE_ALIGN(buf->vb.size) >> PAGE_SHIFT));
+
+	videobuf_dma_pci_map(chip->pci,&buf->vb.dma);
+
+
+	cx88_risc_databuffer(chip->pci, &buf->risc,
+			buf->vb.dma.sglist,
+			buf->vb.width, buf->vb.height);
+
+	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->vb.state = STATE_PREPARED;
+
+	buf->bpl = chip->period_size;
+	chip->buf = buf;
+	chip->dma_risc = buf->vb.dma;
+
+	dprintk(1,"Buffer ready at %u\n",chip->dma_risc.nr_pages);
+	substream->runtime->dma_area = chip->dma_risc.vmalloc;
+	return 0;
+}
+
+/*
+ * hw free callback
+ */
+static int snd_cx88_hw_free(snd_pcm_substream_t * 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(snd_pcm_substream_t *substream)
+{
+	return 0;
+}
+
+
+/*
+ * trigger callback
+ */
+static int snd_cx88_card_trigger(snd_pcm_substream_t *substream, int cmd)
+{
+	snd_cx88_card_t *chip = snd_pcm_substream_chip(substream);
+	int err;
+
+	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(snd_pcm_substream_t *substream)
+{
+	snd_cx88_card_t *chip = snd_pcm_substream_chip(substream);
+	snd_pcm_runtime_t *runtime = substream->runtime;
+
+	if (chip->read_count) {
+		chip->read_count -= snd_pcm_lib_period_bytes(substream);
+		chip->read_offset += snd_pcm_lib_period_bytes(substream);
+		if (chip->read_offset == chip->dma_size)
+			chip->read_offset = 0;
+	}
+
+	dprintk(2, "Pointer time, will return %li, read %li\n",chip->read_offset,chip->read_count);
+	return bytes_to_frames(runtime, chip->read_offset);
+
+}
+
+/*
+ * operators
+ */
+static snd_pcm_ops_t 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,
+};
+
+/*
+ * create a PCM device
+ */
+static int __devinit snd_cx88_pcm(snd_cx88_card_t *chip, int device, char *name)
+{
+	int err;
+	snd_pcm_t *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_capture_volume_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *info)
+{
+	info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	info->count = 1;
+	info->value.integer.min = 0;
+	info->value.integer.max = 0x3f;
+
+	return 0;
+}
+
+/* OK - TODO: test it */
+static int snd_cx88_capture_volume_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *value)
+{
+	snd_cx88_card_t *chip = snd_kcontrol_chip(kcontrol);
+	struct cx88_core *core=chip->core;
+
+	value->value.integer.value[0] = 0x3f - (cx_read(AUD_VOL_CTL) & 0x3f);
+
+	return 0;
+}
+
+/* OK - TODO: test it */
+static int snd_cx88_capture_volume_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *value)
+{
+	snd_cx88_card_t *chip = snd_kcontrol_chip(kcontrol);
+	struct cx88_core *core=chip->core;
+	int v;
+	u32 old_control;
+
+	spin_lock_irq(&chip->reg_lock);
+	old_control = 0x3f - (cx_read(AUD_VOL_CTL) & 0x3f);
+	v = 0x3f - (value->value.integer.value[0] & 0x3f);
+	cx_andor(AUD_VOL_CTL, 0x3f, v);
+	spin_unlock_irq(&chip->reg_lock);
+
+	return v != old_control;
+}
+
+static snd_kcontrol_new_t snd_cx88_capture_volume = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "Capture Volume",
+	.info = snd_cx88_capture_volume_info,
+	.get = snd_cx88_capture_volume_get,
+	.put = snd_cx88_capture_volume_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
+ */
+
+struct pci_device_id cx88_audio_pci_tbl[] = {
+	{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){
+		synchronize_irq(chip->irq);
+		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(snd_card_t * card)
+{
+	snd_cx88_card_t *chip = card->private_data;
+
+	snd_cx88_free(chip);
+}
+
+
+/*
+ * Alsa Constructor - Component probe
+ */
+
+static int devno=0;
+static int __devinit snd_cx88_create(snd_card_t *card, struct pci_dev *pci,
+				    snd_cx88_card_t **rchip)
+{
+	snd_cx88_card_t   *chip;
+	struct cx88_core  *core;
+	int               err;
+
+	*rchip = NULL;
+
+	err = pci_enable_device(pci);
+	if (err < 0)
+		return err;
+
+	pci_set_master(pci);
+
+	chip = (snd_cx88_card_t *) card->private_data;
+
+	core = cx88_core_get(pci);
+
+	if (!pci_dma_supported(pci,0xffffffff)) {
+		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);
+
+	cx88_reset(core);
+	if (NULL == core) {
+		err = -EINVAL;
+		kfree (chip);
+		return err;
+	}
+	chip->core = core;
+
+	/* get irq */
+	err = request_irq(chip->pci->irq, cx8801_irq,
+			  SA_SHIRQ | SA_INTERRUPT, 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_CLASS_REVISION, &chip->pci_rev);
+	pci_read_config_byte(pci, PCI_LATENCY_TIMER,  &chip->pci_lat);
+
+	dprintk(1,"ALSA %s/%i: found at %s, rev: %d, irq: %d, "
+	       "latency: %d, mmio: 0x%lx\n", core->name, devno,
+	       pci_name(pci), chip->pci_rev, pci->irq,
+	       chip->pci_lat,pci_resource_start(pci,0));
+
+	chip->irq = pci->irq;
+	synchronize_irq(chip->irq);
+
+	snd_card_set_dev(card, &pci->dev);
+
+	*rchip = chip;
+
+	return 0;
+}
+
+static int __devinit cx88_audio_initdev(struct pci_dev *pci,
+				    const struct pci_device_id *pci_id)
+{
+	snd_card_t       *card;
+	snd_cx88_card_t  *chip;
+	int              err;
+
+	if (devno >= SNDRV_CARDS)
+		return (-ENODEV);
+
+	if (!enable[devno]) {
+		++devno;
+		return (-ENOENT);
+	}
+
+	card = snd_card_new(index[devno], id[devno], THIS_MODULE, sizeof(snd_cx88_card_t));
+	if (!card)
+		return (-ENOMEM);
+
+	card->private_free = snd_cx88_dev_free;
+
+	err = snd_cx88_create(card, pci, &chip);
+	if (err < 0)
+		return (err);
+
+	err = snd_cx88_pcm(chip, 0, "CX88 Digital");
+
+	if (err < 0) {
+		snd_card_free(card);
+		return (err);
+	}
+
+	err = snd_ctl_add(card, snd_ctl_new1(&snd_cx88_capture_volume, chip));
+	if (err < 0) {
+		snd_card_free(card);
+		return (err);
+	}
+
+	strcpy (card->driver, "CX88x");
+	sprintf(card->shortname, "Conexant CX%x", pci->device);
+	sprintf(card->longname, "%s at %#lx",
+		card->shortname, 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) {
+		snd_card_free(card);
+		return (err);
+	}
+	snd_cx88_cards[devno] = card;
+
+	pci_set_drvdata(pci,card);
+
+	devno++;
+	return 0;
+}
+/*
+ * 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   = cx88_audio_finidev,
+	SND_PCI_PM_CALLBACKS
+};
+
+/****************************************************************************
+				LINUX MODULE INIT
+ ****************************************************************************/
+
+/*
+ * module init
+ */
+static int cx88_audio_init(void)
+{
+	printk(KERN_INFO "cx2388x alsa driver version %d.%d.%d loaded\n",
+	       (CX88_VERSION_CODE >> 16) & 0xff,
+	       (CX88_VERSION_CODE >>  8) & 0xff,
+	       CX88_VERSION_CODE & 0xff);
+#ifdef SNAPSHOT
+	printk(KERN_INFO "cx2388x: snapshot date %04d-%02d-%02d\n",
+	       SNAPSHOT/10000, (SNAPSHOT/100)%100, SNAPSHOT%100);
+#endif
+	return pci_register_driver(&cx88_audio_pci_driver);
+}
+
+/*
+ * module remove
+ */
+static void cx88_audio_fini(void)
+{
+
+	pci_unregister_driver(&cx88_audio_pci_driver);
+}
+
+module_init(cx88_audio_init);
+module_exit(cx88_audio_fini);
+
+/* ----------------------------------------------------------- */
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */

drivers/media/video/cx88/cx88-core.c

@@ -238,9 +238,9 @@ cx88_free_buffer(struct pci_dev *pci, struct cx88_buffer *buf)
  *    channel  22    (u video)  -  2.0k
  *    channel  23    (v video)  -  2.0k
  *    channel  24    (vbi)      -  4.0k
- *    channels 25+26 (audio)    -  0.5k
+ *    channels 25+26 (audio)    -  4.0k
  *    channel  28    (mpeg)     -  4.0k
- *    TOTAL                     = 25.5k
+ *    TOTAL                     = 29.0k
  *
  * Every channel has 160 bytes control data (64 bytes instruction
  * queue and 6 CDT entries), which is close to 2k total.
@@ -306,7 +306,7 @@ struct sram_channel cx88_sram_channels[] = {
 		.ctrl_start = 0x180680,
 		.cdt        = 0x180680 + 64,
 		.fifo_start = 0x185400,
-		.fifo_size  = 0x000200,
+		.fifo_size  = 0x001000,
 		.ptr1_reg   = MO_DMA25_PTR1,
 		.ptr2_reg   = MO_DMA25_PTR2,
 		.cnt1_reg   = MO_DMA25_CNT1,
@@ -318,7 +318,7 @@ struct sram_channel cx88_sram_channels[] = {
 		.ctrl_start = 0x180720,
 		.cdt        = 0x180680 + 64,  /* same as audio IN */
 		.fifo_start = 0x185400,       /* same as audio IN */
-		.fifo_size  = 0x000200,       /* same as audio IN */
+		.fifo_size  = 0x001000,       /* same as audio IN */
 		.ptr1_reg   = MO_DMA26_PTR1,
 		.ptr2_reg   = MO_DMA26_PTR2,
 		.cnt1_reg   = MO_DMA26_CNT1,
@@ -329,7 +329,7 @@ struct sram_channel cx88_sram_channels[] = {
 		.cmds_start = 0x180200,
 		.ctrl_start = 0x1807C0,
 		.cdt        = 0x1807C0 + 64,
-		.fifo_start = 0x185600,
+		.fifo_start = 0x186400,
 		.fifo_size  = 0x001000,
 		.ptr1_reg   = MO_DMA28_PTR1,
 		.ptr2_reg   = MO_DMA28_PTR2,
@@ -795,7 +795,6 @@ int cx88_start_audio_dma(struct cx88_core *core)
 
 	/* start dma */
 	cx_write(MO_AUD_DMACNTRL, 0x0003); /* Up and Down fifo enable */
-
 	return 0;
 }
 

drivers/media/video/cx88/cx88-tvaudio.c

@@ -132,10 +132,14 @@ static void set_audio_finish(struct cx88_core *core, u32 ctl)
 {
 	u32 volume;
 
+#ifndef USING_CX88_ALSA
 	/* restart dma; This avoids buzz in NICAM and is good in others  */
 	cx88_stop_audio_dma(core);
+#endif
 	cx_write(AUD_RATE_THRES_DMD, 0x000000C0);
+#ifndef USING_CX88_ALSA
 	cx88_start_audio_dma(core);
+#endif
 
 	if (cx88_boards[core->board].blackbird) {
 		/* sets sound input from external adc */