主要是注册DAI，没有注册route、widget、control，最终填充 snd_soc_component主要域；
https://elixir.bootlin.com/linux/v5.0-rc6/source/sound/soc/fsl/fsl_esai.c#L915
- fsl_esai_component
static const struct snd_soc_component_driver fsl_esai_component = { .name = "fsl-esai", };
- fsl_esai_dai
static const struct snd_soc_dai_ops fsl_esai_dai_ops = { .startup = fsl_esai_startup, .shutdown = fsl_esai_shutdown, .trigger = fsl_esai_trigger, .hw_params = fsl_esai_hw_params, .set_sysclk = fsl_esai_set_dai_sysclk, .set_fmt = fsl_esai_set_dai_fmt, .set_tdm_slot = fsl_esai_set_dai_tdm_slot, }; static struct snd_soc_dai_driver fsl_esai_dai = { .probe = fsl_esai_dai_probe, /* DAI capabilities */ // struct snd_soc_pcm_stream playback; .playback = { .stream_name = "CPU-Playback", .channels_min = 1, .channels_max = 12, .rates = SNDRV_PCM_RATE_8000_192000, .formats = FSL_ESAI_FORMATS, }, /* DAI capabilities */ //struct snd_soc_pcm_stream capture; .capture = { .stream_name = "CPU-Capture", .channels_min = 1, .channels_max = 8, .rates = SNDRV_PCM_RATE_8000_192000, .formats = FSL_ESAI_FORMATS, }, .ops = &fsl_esai_dai_ops, // 这里的ops会转移到生成的pcm的ops };
static int fsl_esai_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct fsl_esai *esai_priv;
struct resource *res;
const __be32 *iprop;
void __iomem *regs;
int irq, ret;
esai_priv = devm_kzalloc(&pdev->dev, sizeof(*esai_priv), GFP_KERNEL);
if (!esai_priv)
return -ENOMEM;
esai_priv->pdev = pdev;
snprintf(esai_priv->name, sizeof(esai_priv->name), "%pOFn", np);
/* Get the addresses and IRQ */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(regs))
return PTR_ERR(regs);
esai_priv->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
"core", regs, &fsl_esai_regmap_config);
if (IS_ERR(esai_priv->regmap)) {
dev_err(&pdev->dev, "failed to init regmap: %ld\n",
PTR_ERR(esai_priv->regmap));
return PTR_ERR(esai_priv->regmap);
}
esai_priv->coreclk = devm_clk_get(&pdev->dev, "core");
if (IS_ERR(esai_priv->coreclk)) {
dev_err(&pdev->dev, "failed to get core clock: %ld\n",
PTR_ERR(esai_priv->coreclk));
return PTR_ERR(esai_priv->coreclk);
}
esai_priv->extalclk = devm_clk_get(&pdev->dev, "extal");
if (IS_ERR(esai_priv->extalclk))
dev_warn(&pdev->dev, "failed to get extal clock: %ld\n",
PTR_ERR(esai_priv->extalclk));
esai_priv->fsysclk = devm_clk_get(&pdev->dev, "fsys");
if (IS_ERR(esai_priv->fsysclk))
dev_warn(&pdev->dev, "failed to get fsys clock: %ld\n",
PTR_ERR(esai_priv->fsysclk));
esai_priv->spbaclk = devm_clk_get(&pdev->dev, "spba");
if (IS_ERR(esai_priv->spbaclk))
dev_warn(&pdev->dev, "failed to get spba clock: %ld\n",
PTR_ERR(esai_priv->spbaclk));
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "no irq for node %s\n", pdev->name);
return irq;
}
ret = devm_request_irq(&pdev->dev, irq, esai_isr, 0,
esai_priv->name, esai_priv);
if (ret) {
dev_err(&pdev->dev, "failed to claim irq %u\n", irq);
return ret;
}
/* Set a default slot number */
esai_priv->slots = 2;
/* Set a default master/slave state */
esai_priv->slave_mode = true;
/* Determine the FIFO depth */
iprop = of_get_property(np, "fsl,fifo-depth", NULL);
if (iprop)
esai_priv->fifo_depth = be32_to_cpup(iprop);
else
esai_priv->fifo_depth = 64;
esai_priv->dma_params_tx.maxburst = 16;
esai_priv->dma_params_rx.maxburst = 16;
esai_priv->dma_params_tx.addr = res->start + REG_ESAI_ETDR;
esai_priv->dma_params_rx.addr = res->start + REG_ESAI_ERDR;
esai_priv->synchronous =
of_property_read_bool(np, "fsl,esai-synchronous");
/* Implement full symmetry for synchronous mode */
if (esai_priv->synchronous) {
fsl_esai_dai.symmetric_rates = 1;
fsl_esai_dai.symmetric_channels = 1;
fsl_esai_dai.symmetric_samplebits = 1;
}
dev_set_drvdata(&pdev->dev, esai_priv);
/* Reset ESAI unit */
ret = regmap_write(esai_priv->regmap, REG_ESAI_ECR, ESAI_ECR_ERST);
if (ret) {
dev_err(&pdev->dev, "failed to reset ESAI: %d\n", ret);
return ret;
}
/*
* We need to enable ESAI so as to access some of its registers.
* Otherwise, we would fail to dump regmap from user space.
*/
ret = regmap_write(esai_priv->regmap, REG_ESAI_ECR, ESAI_ECR_ESAIEN);
if (ret) {
dev_err(&pdev->dev, "failed to enable ESAI: %d\n", ret);
return ret;
}
ret = devm_snd_soc_register_component(&pdev->dev, &fsl_esai_component, // 注册component
&fsl_esai_dai, 1);
if (ret) {
dev_err(&pdev->dev, "failed to register DAI: %d\n", ret);
return ret;
}
ret = imx_pcm_dma_init(pdev, IMX_ESAI_DMABUF_SIZE);
if (ret)
dev_err(&pdev->dev, "failed to init imx pcm dma: %d\n", ret);
return ret;
}* static int fsl_esai_probe(struct platform_device *pdev)
* ret = devm_snd_soc_register_component(&pdev->dev, &fsl_esai_component, &fsl_esai_dai, 1);
* ret = snd_soc_register_component(dev, cmpnt_drv, dai_drv, num_dai);
* component = devm_kzalloc(dev, sizeof(*component), GFP_KERNEL);
* return snd_soc_add_component(dev, component, component_driver, dai_drv, num_dai);
* ret = snd_soc_component_initialize(component, component_driver, dev);
* component->name = fmt_single_name(dev, &component->id);
```
static char *fmt_single_name(struct device *dev, int *id)
{
[...省略]
strlcpy(name, dev_name(dev), NAME_SIZE);
/* are we a "%s.%d" name (platform and SPI components) */
found = strstr(name, dev->driver->name);
if (found) {
/* get ID */
if (sscanf(&found[strlen(dev->driver->name)], ".%d", id) == 1) {
/* discard ID from name if ID == -1 */
if (*id == -1)
found[strlen(dev->driver->name)] = '\0';
}
} else {
/* I2C component devices are named "bus-addr" */
if (sscanf(name, "%x-%x", &id1, &id2) == 2) {
char tmp[NAME_SIZE];
/* create unique ID number from I2C addr and bus */
*id = ((id1 & 0xffff) << 16) + id2;
/* sanitize component name for DAI link creation */
snprintf(tmp, NAME_SIZE, "%s.%s", dev->driver->name,
name);
strlcpy(name, tmp, NAME_SIZE);
} else
*id = 0;
}
return kstrdup(name, GFP_KERNEL);
}
```
* ret = snd_soc_register_dais(component, dai_drv, num_dai);
* snd_soc_component_add(component);
* list_add(&component->list, &component_list);
* static LIST_HEAD(component_list);
* snd_soc_try_rebind_card();
* if (!snd_soc_bind_card(card))
* ret = snd_soc_instantiate_card(card);
* ret = imx_pcm_dma_init(pdev, IMX_ESAI_DMABUF_SIZE); // 申请DMA
* config = devm_kzalloc(&pdev->dev, sizeof(struct snd_dmaengine_pcm_config), GFP_KERNEL);
* *config = imx_dmaengine_pcm_config;
* return devm_snd_dmaengine_pcm_register(&pdev->dev, config, SND_DMAENGINE_PCM_FLAG_COMPAT);
* ret = dmaengine_pcm_request_chan_of(pcm, dev, config);
* if (config && config->process) ret = snd_soc_add_component(dev, &pcm->component, &dmaengine_pcm_component_process, NULL, 0);
* else ret = snd_soc_add_component(dev, &pcm->component, &dmaengine_pcm_component, NULL, 0);