ALSA 声卡 驱动 linux 4.1.36 中变化

linux 4.1.36 中变化

1
ret = request_irq(IRQ_DMA2, s3c2440_dma2_irq, IRQF_DISABLED, "myalsa for playback", substream);

IRQF_DISABLED 换为 IRQF_TRIGGER_NONE

2
snd_soc_register_dai(&pdev->dev, &s3c2440_i2s_dai);
换为
static const struct snd_soc_component_driver s3c2440_i2s_component = {    
    .name = "s3c2440-iis",
};

ret = devm_snd_soc_register_component(&pdev->dev, &s3c2440_i2s_component, &s3c2440_i2s_dai, 1);

3

struct snd_soc_pcm_runtime *rtd

中没有 rtd->codec 成员。

4

snd_soc_dapm_new_widgets(dapm) 改为 dapm->card

5 devs.c 中没有 i2s 的配置  从 网上找到补丁， 结果还是不能使用。 先使用 ko 加载吧，也能使用，以后有空在编进内核。

#ifdef CONFIG_PLAT_S3C24XX
static struct resource s3c_iis_resource[] = {
    [0] = DEFINE_RES_MEM(S3C24XX_PA_IIS, S3C24XX_SZ_IIS),
};

static struct s3c_audio_pdata s3c_iis_platdata = {
    .dma_playback = (void *)DMACH_I2S_OUT,
    .dma_capture = (void *)DMACH_I2S_IN,
};

struct platform_device s3c_device_iis = {
    .name        = "s3c24xx-iis",
    .id        = -1,
    .num_resources    = ARRAY_SIZE(s3c_iis_resource),
    .resource    = s3c_iis_resource,
    .dev        = {
        .dma_mask        = &samsung_device_dma_mask,
        .coherent_dma_mask    = DMA_BIT_MASK(32),
        .platform_data = &s3c_iis_platdata,
    }
};

s3c24xx-i2s.c

添加头文件

//new add
#include <linux/platform_data/asoc-s3c.h>

static struct s3c_dma_params s3c24xx_i2s_pcm_stereo_out = {
    //.slave        = (void *)(uintptr_t)DMACH_I2S_OUT,
    .ch_name    = "tx",
    .dma_size    = 2,
};

static struct s3c_dma_params s3c24xx_i2s_pcm_stereo_in = {
    //.slave        = (void *)(uintptr_t)DMACH_I2S_IN,
    .ch_name    = "rx",
    .dma_size    = 2,
};

static int s3c24xx_iis_dev_probe(struct platform_device *pdev)
{
    int ret = 0;
    struct resource *res;
    //new add
    struct s3c_audio_pdata *pdata = dev_get_platdata(&pdev->dev);
    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    if (!res) {
        dev_err(&pdev->dev, "Can't get IO resource.\n");
        return -ENOENT;
    }
    s3c24xx_i2s.regs = devm_ioremap_resource(&pdev->dev, res);
    if (IS_ERR(s3c24xx_i2s.regs))
        return PTR_ERR(s3c24xx_i2s.regs);

s3c24xx_i2s_pcm_stereo_out.dma_addr = res->start + S3C2410_IISFIFO;
    s3c24xx_i2s_pcm_stereo_out.slave = pdata->dma_playback;
    s3c24xx_i2s_pcm_stereo_in.dma_addr = res->start + S3C2410_IISFIFO;
    s3c24xx_i2s_pcm_stereo_in.slave = pdata->dma_capture;

ret = devm_snd_soc_register_component(&pdev->dev,
            &s3c24xx_i2s_component, &s3c24xx_i2s_dai, 1);
    if (ret) {
        pr_err("failed to register the dai\n");
        return ret;
    }

ret = samsung_asoc_dma_platform_register(&pdev->dev);
    if (ret)
        pr_err("failed to register the dma: %d\n", ret);

return ret;
}

如果不配置就会出错

S3C24XX_UDA134X SoC Audio driver
soc-audio soc-audio: ASoC: machine S3C24XX_UDA134X should use snd_soc_register_card()
s3c24xx-iis s3c24xx-iis: Missing dma channel for stream: 0
s3c24xx-iis s3c24xx-iis: ASoC: pcm constructor failed: -22
soc-audio soc-audio: ASoC: can't create pcm UDA134X :-22
soc-audio soc-audio: ASoC: failed to instantiate card -22
soc-audio: probe of soc-audio failed with error -22

附上驱动成功的图