// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for the Conexant CX25821 PCIe bridge
*
* Copyright (C) 2009 Conexant Systems Inc.
* Authors <[email protected]>, <[email protected]>
* Based on SAA713x ALSA driver and CX88 driver
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#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 <linux/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...) \
do { \
if (debug >= level) \
pr_info("%s/1: " fmt, chip->dev->name, ##arg); \
} while (0)
#define dprintk_core(level, fmt, arg...) \
do { \
if (debug >= level) \
printk(KERN_DEBUG "%s/1: " fmt, chip->dev->name, ##arg); \
} while (0)
/****************************************************************************
Data type declarations - Can be moded to a header file later
****************************************************************************/
static int devno;
struct cx25821_audio_buffer {
unsigned int bpl;
struct cx25821_riscmem risc;
void *vaddr;
struct scatterlist *sglist;
int sglen;
unsigned long nr_pages;
};
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 cx25821_audio_buffer *buf;
struct snd_pcm_substream *substream;
};
/****************************************************************************
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 bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
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");
static unsigned int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "enable debug messages");
/****************************************************************************
Module specific functions
****************************************************************************/
/* 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)
static int cx25821_alsa_dma_init(struct cx25821_audio_dev *chip,
unsigned long nr_pages)
{
struct cx25821_audio_buffer *buf = chip->buf;
struct page *pg;
int i;
buf->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT);
if (NULL == buf->vaddr) {
dprintk(1, "vmalloc_32(%lu pages) failed\n", nr_pages);
return -ENOMEM;
}
dprintk(1, "vmalloc is at addr 0x%p, size=%lu\n",
buf->vaddr,
nr_pages << PAGE_SHIFT);
memset(buf->vaddr, 0, nr_pages << PAGE_SHIFT);
buf->nr_pages = nr_pages;
buf->sglist = vzalloc(array_size(sizeof(*buf->sglist), buf->nr_pages));
if (NULL == buf->sglist)
goto vzalloc_err;
sg_init_table(buf->sglist, buf->nr_pages);
for (i = 0; i < buf->nr_pages; i++) {
pg = vmalloc_to_page(buf->vaddr + i * PAGE_SIZE);
if (NULL == pg)
goto vmalloc_to_page_err;
sg_set_page(&buf->sglist[i], pg, PAGE_SIZE, 0);
}
return 0;
vmalloc_to_page_err:
vfree(buf->sglist);
buf->sglist = NULL;
vzalloc_err:
vfree(buf->vaddr);
buf->vaddr = NULL;
return -ENOMEM;
}
static int cx25821_alsa_dma_map(struct cx25821_audio_dev *dev)
{
struct cx25821_audio_buffer *buf = dev->buf;
buf->sglen = dma_map_sg(&dev->pci->dev, buf->sglist,
buf->nr_pages, DMA_FROM_DEVICE);
if (0 == buf->sglen) {
pr_warn("%s: cx25821_alsa_map_sg failed\n", __func__);
return -ENOMEM;
}
return 0;
}
static int cx25821_alsa_dma_unmap(struct cx25821_audio_dev *dev)
{
struct cx25821_audio_buffer *buf = dev->buf;
if (!buf->sglen)
return 0;
dma_unmap_sg(&dev->pci->dev, buf->sglist, buf->nr_pages, DMA_FROM_DEVICE);
buf->sglen = 0;
return 0;
}
static int cx25821_alsa_dma_free(struct cx25821_audio_buffer *buf)
{
vfree(buf->sglist);
buf->sglist = NULL;
vfree(buf->vaddr);
buf->vaddr = NULL;
return 0;
}
/*
* BOARD Specific: Sets audio DMA
*/
static int _cx25821_start_audio_dma(struct cx25821_audio_dev *chip)
{
struct cx25821_audio_buffer *buf = chip->buf;
struct cx25821_dev *dev = chip->dev;
const 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 */
/* GP_COUNT_CONTROL_RESET = 0x3 */
cx_write(AUD_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
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);
/*
pr_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(struct cx25821_audio_dev *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(struct cx25821_audio_dev *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) {
pr_warn("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) {
pr_warn("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)
{
struct cx25821_audio_dev *chip = dev_id;
struct cx25821_dev *dev = chip->dev;
u32 status, pci_status;
u32 audint_status, audint_mask;
int loop, handled = 0;
audint_status = cx_read(AUD_A_INT_STAT);
audint_mask = cx_read(AUD_A_INT_MSK);
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(struct cx25821_audio_dev *chip)
{
struct cx25821_riscmem *risc = &chip->buf->risc;
BUG_ON(!chip->dma_size);
dprintk(2, "Freeing buffer\n");
cx25821_alsa_dma_unmap(chip);
cx25821_alsa_dma_free(chip->buf);
dma_free_coherent(&chip->pci->dev, risc->size, risc->cpu, risc->dma);
kfree(chip->buf);
chip->buf = NULL;
chip->dma_size = 0;
return 0;
}
/****************************************************************************
ALSA PCM Interface
****************************************************************************/
/*
* Digital hardware definition
*/
#define DEFAULT_FIFO_SIZE 384
static const 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,
/* 128 * 128 = 16384 = 1024 * 16 */
.buffer_bytes_max = (AUDIO_LINE_SIZE * AUDIO_LINE_SIZE),
};
/*
* audio pcm capture open callback
*/
static int snd_cx25821_pcm_open(struct snd_pcm_substream *substream)
{
struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
int err;
unsigned int bpl = 0;
if (!chip) {
pr_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) {
/* since there are 3 audio Clusters */
bpl = cx25821_sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 3;
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)
{
struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
struct cx25821_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;
if (chip->period_size > AUDIO_LINE_SIZE)
chip->period_size = AUDIO_LINE_SIZE;
buf->bpl = chip->period_size;
chip->buf = buf;
ret = cx25821_alsa_dma_init(chip,
(PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT));
if (ret < 0)
goto error;
ret = cx25821_alsa_dma_map(chip);
if (ret < 0)
goto error;
ret = cx25821_risc_databuffer_audio(chip->pci, &buf->risc, buf->sglist,
chip->period_size, chip->num_periods, 1);
if (ret < 0) {
pr_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 */
substream->runtime->dma_area = chip->buf->vaddr;
substream->runtime->dma_bytes = chip->dma_size;
substream->runtime->dma_addr = 0;
return 0;
error:
chip->buf = NULL;
kfree(buf);
return ret;
}
/*
* hw free callback
*/
static int snd_cx25821_hw_free(struct snd_pcm_substream *substream)
{
struct cx25821_audio_dev *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)
{
struct cx25821_audio_dev *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)
{
struct cx25821_audio_dev *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 const struct snd_pcm_ops snd_cx25821_pcm_ops = {
.open = snd_cx25821_pcm_open,
.close = snd_cx25821_close,
.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(struct cx25821_audio_dev *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) {
pr_info("ERROR: FAILED snd_pcm_new() in %s\n", __func__);
return err;
}
pcm->private_data = chip;
pcm->info_flags = 0;
strscpy(pcm->name, name, sizeof(pcm->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 const struct pci_device_id __maybe_unused cx25821_audio_pci_tbl[] = {
{0x14f1, 0x0920, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
{0,}
};
MODULE_DEVICE_TABLE(pci, cx25821_audio_pci_tbl);
/*
* Alsa Constructor - Component probe
*/
static int cx25821_audio_initdev(struct cx25821_dev *dev)
{
struct snd_card *card;
struct cx25821_audio_dev *chip;
int err;
if (devno >= SNDRV_CARDS) {
pr_info("DEBUG ERROR: devno >= SNDRV_CARDS %s\n", __func__);
return -ENODEV;
}
if (!enable[devno]) {
++devno;
pr_info("DEBUG ERROR: !enable[devno] %s\n", __func__);
return -ENOENT;
}
err = snd_card_new(&dev->pci->dev, index[devno], id[devno],
THIS_MODULE,
sizeof(struct cx25821_audio_dev), &card);
if (err < 0) {
pr_info("DEBUG ERROR: cannot create snd_card_new in %s\n",
__func__);
return err;
}
strscpy(card->driver, "cx25821", sizeof(card->driver));
/* Card "creation" */
chip = 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 = devm_request_irq(&dev->pci->dev, dev->pci->irq, cx25821_irq,
IRQF_SHARED, chip->dev->name, chip);
if (err < 0) {
pr_err("ERROR %s: can't get IRQ %d for ALSA\n", chip->dev->name,
dev->pci->irq);
goto error;
}
err = snd_cx25821_pcm(chip, 0, "cx25821 Digital");
if (err < 0) {
pr_info("DEBUG ERROR: cannot create snd_cx25821_pcm %s\n",
__func__);
goto error;
}
strscpy(card->shortname, "cx25821", sizeof(card->shortname));
sprintf(card->longname, "%s at 0x%lx irq %d", chip->dev->name,
chip->iobase, chip->irq);
strscpy(card->mixername, "CX25821", sizeof(card->mixername));
pr_info("%s/%i: ALSA support for cx25821 boards\n", card->driver,
devno);
err = snd_card_register(card);
if (err < 0) {
pr_info("DEBUG ERROR: cannot register sound card %s\n",
__func__);
goto error;
}
dev->card = card;
devno++;
return 0;
error:
snd_card_free(card);
return err;
}
/****************************************************************************
LINUX MODULE INIT
****************************************************************************/
static int cx25821_alsa_exit_callback(struct device *dev, void *data)
{
struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
struct cx25821_dev *cxdev = get_cx25821(v4l2_dev);
snd_card_free(cxdev->card);
return 0;
}
static void cx25821_audio_fini(void)
{
struct device_driver *drv = driver_find("cx25821", &pci_bus_type);
int ret;
ret = driver_for_each_device(drv, NULL, NULL, cx25821_alsa_exit_callback);
if (ret)
pr_err("%s failed to find a cx25821 driver.\n", __func__);
}
static int cx25821_alsa_init_callback(struct device *dev, void *data)
{
struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
struct cx25821_dev *cxdev = get_cx25821(v4l2_dev);
cx25821_audio_initdev(cxdev);
return 0;
}
/*
* Module initializer
*
* Loops through present saa7134 cards, and assigns an ALSA device
* to each one
*
*/
static int cx25821_alsa_init(void)
{
struct device_driver *drv = driver_find("cx25821", &pci_bus_type);
return driver_for_each_device(drv, NULL, NULL, cx25821_alsa_init_callback);
}
late_initcall(cx25821_alsa_init);
module_exit(cx25821_audio_fini);
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