• SSM4567

• EVAL-SSM4567Z

The I2C address of the SSM4567 depends on the setting of the ADDR pin.

static struct i2c_board_info __initdata bfin_i2c_board_info[] = {
 
	[--snip--]
	{
		I2C_BOARD_INFO("ssm4567", 0x34),
	},
	[--snip--]
}

static int __init stamp_init(void)
{
	[--snip--]
	i2c_register_board_info(0, bfin_i2c_board_info,
				ARRAY_SIZE(bfin_i2c_board_info));
	[--snip--]
 
	return 0;
}
arch_initcall(board_init);

i2s: i2c@41600000 {
	compatible = "...;
	...

	#size-cells = <0>;
	#address-cells = <1>;
            
	ssm4567: ssm4567@34 {
		compatible = "adi,ssm4567";
		reg = <0x34>;
	};
};

The amplifier driver registers one DAIs, one for each serial port. The DAI is named “ssm4567-hifi”

If you want to use the SSM4567 in TDM mode you can configure it using snd_soc_dai_set_tdm_slot() from you ASoC board driver.

The following restrictions apply to the parameters of snd_soc_dai_set_tdm_slot().

• tx_mask specifies the output channel mapping for the serial port. This must either be 0, or the same as rx_mask.
• rx_mask specifies the input channel mapping for the serial port. There must be exactly one bit set in this mask which selects the slot that is used.
• slots should be between 1 and 8
• width must be either 32, 48, 64

Example:

static int ssm4567_link_init(struct snd_soc_pcm_runtime *rtd)
{
    int ret;
 
    ret = snd_soc_dai_set_tdm_slot(rtd->codec_dai, 0x01, 0x01, 8, 32);
    if (ret < 0)
        return ret;
 
    return 0;
}
 
static struct snd_soc_dai_link ssm4567_dai_link = {
    ...,
    .init = ssm4567_link_init,
};

static const struct snd_soc_dapm_widget ssm4567_zed_widgets[] = {
	SND_SOC_DAPM_SPK("Speaker", NULL),
};
 
static const struct snd_soc_dapm_route ssm4567_zed_routes[] = {
	{ "Speaker", NULL, "OUT" },
};
 
static struct snd_soc_dai_link ssm4567_zed_dai_link = {
    .name = "ssm4567",
    .stream_name = "ssm4567",
    .codec_dai_name = "ssm4567-hifi",
    .dai_fmt = SND_SOC_DAIFMT_DSP_A |
            SND_SOC_DAIFMT_NB_NF |
            SND_SOC_DAIFMT_CBS_CFS,
    .init = ssm4567_zed_init,
};
 
static struct snd_soc_card ssm4567_zed_card = {
    .name = "ZED SSM4567",
    .owner = THIS_MODULE,
    .dai_link = &zed_ssm4567_dai_link,
    .num_links = 1,
    .dapm_widgets = zed_ssm4567_widgets,
    .num_dapm_widgets = ARRAY_SIZE(zed_ssm4567_widgets),
    .dapm_routes = zed_ssm4567_routes,
    .num_dapm_routes = ARRAY_SIZE(zed_ssm4567_routes),
    .fully_routed = true,
};

This example shows how to setup a ASoC board driver for a system with two SSM4567, one driving the left speaker and the other driving the right speaker. In this example the left SSM4567 is at I2C address 0x34 (ADDR=0) and the right SSM4567 is at I2S address 0x35 (ADDR=1).

Note support for multiple CODECs on a single DAI link requires Linux v3.17 or higher.

static int ssm4567_link_init(struct snd_soc_pcm_runtime *rtd)
{
	int ret;
 
	/* Slot 0 for left */
	ret = snd_soc_dai_set_tdm_slot(rtd->codec_dais[0], 0x01, 0x01, 2, 32);
	if (ret < 0)
		return ret;
 
	/* Slot 2 for right */
	ret = snd_soc_dai_set_tdm_slot(rtd->codec_dais[1], 0x02, 0x02, 2, 32);
	if (ret < 0)
		return ret;
 
	return 0;
}
 
static const struct snd_soc_dapm_widget ssm4567_zed_widgets[] = {
	SND_SOC_DAPM_SPK("Left Speaker", NULL),
	SND_SOC_DAPM_SPK("Right Speaker", NULL),
};
 
static const struct snd_soc_dapm_route ssm4567_zed_routes[] = {
	{ "Left Speaker", NULL, "Left OUT" },
	{ "Right Speaker", NULL, "Right OUT" },
};
 
static const snd_soc_dai_link_component ssm4567_zed_codec_components[] = {
	{ /* Left */
		.name = "ssm4567.0-0034",
		.codec_dai_name = "ssm4567-hifi",
	},
	{ /* Right */
		.name = "ssm4567.0-0035",
		.codec_dai_name = "ssm4567-hifi",
	},
 
};
 
/* Assign prefix to avoid name conflicts */
static const struct snd_soc_codec_conf ssm4567_zed_codec_conf[] = {
	{
		.dev_name = "ssm4567.0-0034",
		.name_prefix = "Left",
	},
	{
		.dev_name = "ssm4567.0-0035",
		.name_prefix = "Right",
	},
};
 
static struct snd_soc_dai_link ssm4567_zed_dai_link = {
	.name = "ssm4567",
	.stream_name = "ssm4567",
 
	.codecs = ssm4567_zed_codec_components,
	.num_codecs = ARRAY_SIZE(ssm4567_zed_codec_components),
	.codec_conf = ssm4567_zed_codec_conf,
	.num_configs = ARRAY_SIZE(ssm4567_zed_codec_conf),
 
	.dai_fmt = SND_SOC_DAIFMT_DSP_A |
		SND_SOC_DAIFMT_NB_NF |
		SND_SOC_DAIFMT_CBS_CFS,
	.init = ssm4567_link_init,
};
 
static struct snd_soc_card ssm4567_zed_card = {
    .name = "ZED SSM4567",
    .owner = THIS_MODULE,
    .dai_link = &zed_ssm4567_dai_link,
    .num_links = 1,
    .dapm_widgets = zed_ssm4567_widgets,
    .num_dapm_widgets = ARRAY_SIZE(zed_ssm4567_widgets),
    .dapm_routes = zed_ssm4567_routes,
    .num_dapm_routes = ARRAY_SIZE(zed_ssm4567_routes),
    .fully_routed = true,
};

• SSM4329 Linux Driver