sound/soc/intel/avs/utils.h

Source file repositories/reference/linux-study-clean/sound/soc/intel/avs/utils.h

File Facts

System
Linux kernel
Corpus path
sound/soc/intel/avs/utils.h
Extension
.h
Size
1832 bytes
Lines
78
Domain
Driver Families
Bucket
sound/soc
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct avs_mach_pdata {
	struct hda_codec *codec;
	unsigned long *tdms;
	char *codec_name; /* DMIC only */

	bool obsolete_card_names;
};

static inline bool avs_mach_singular_ssp(struct snd_soc_acpi_mach *mach)
{
	return hweight_long(mach->mach_params.i2s_link_mask) == 1;
}

static inline u32 avs_mach_ssp_port(struct snd_soc_acpi_mach *mach)
{
	return __ffs(mach->mach_params.i2s_link_mask);
}

static inline bool avs_mach_singular_tdm(struct snd_soc_acpi_mach *mach, u32 port)
{
	struct avs_mach_pdata *pdata = mach->pdata;
	unsigned long *tdms = pdata->tdms;

	return !tdms || (hweight_long(tdms[port]) == 1);
}

static inline u32 avs_mach_ssp_tdm(struct snd_soc_acpi_mach *mach, u32 port)
{
	struct avs_mach_pdata *pdata = mach->pdata;
	unsigned long *tdms = pdata->tdms;

	return tdms ? __ffs(tdms[port]) : 0;
}

static inline int avs_mach_get_ssp_tdm(struct device *dev, struct snd_soc_acpi_mach *mach,
				       int *ssp_port, int *tdm_slot)
{
	int port;

	if (!avs_mach_singular_ssp(mach)) {
		dev_err(dev, "Invalid SSP configuration\n");
		return -EINVAL;
	}
	port = avs_mach_ssp_port(mach);

	if (!avs_mach_singular_tdm(mach, port)) {
		dev_err(dev, "Invalid TDM configuration\n");
		return -EINVAL;
	}
	*ssp_port = port;
	*tdm_slot = avs_mach_ssp_tdm(mach, *ssp_port);

	return 0;
}

/*
 * Macro to easily generate format strings
 */
#define AVS_STRING_FMT(prefix, suffix, ssp, tdm) \
	(tdm) ? prefix "%d:%d" suffix : prefix "%d" suffix, (ssp), (tdm)

#endif

Annotation

Implementation Notes