drivers/mfd/madera-i2c.c

Source file repositories/reference/linux-study-clean/drivers/mfd/madera-i2c.c

File Facts

System
Linux kernel
Corpus path
drivers/mfd/madera-i2c.c
Extension
.c
Size
3502 bytes
Lines
144
Domain
Driver Families
Bucket
drivers/mfd
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

if (IS_ENABLED(CONFIG_MFD_CS47L15)) {
			regmap_16bit_config = &cs47l15_16bit_i2c_regmap;
			regmap_32bit_config = &cs47l15_32bit_i2c_regmap;
		}
		break;
	case CS47L35:
		if (IS_ENABLED(CONFIG_MFD_CS47L35)) {
			regmap_16bit_config = &cs47l35_16bit_i2c_regmap;
			regmap_32bit_config = &cs47l35_32bit_i2c_regmap;
		}
		break;
	case CS47L85:
	case WM1840:
		if (IS_ENABLED(CONFIG_MFD_CS47L85)) {
			regmap_16bit_config = &cs47l85_16bit_i2c_regmap;
			regmap_32bit_config = &cs47l85_32bit_i2c_regmap;
		}
		break;
	case CS47L90:
	case CS47L91:
		if (IS_ENABLED(CONFIG_MFD_CS47L90)) {
			regmap_16bit_config = &cs47l90_16bit_i2c_regmap;
			regmap_32bit_config = &cs47l90_32bit_i2c_regmap;
		}
		break;
	case CS42L92:
	case CS47L92:
	case CS47L93:
		if (IS_ENABLED(CONFIG_MFD_CS47L92)) {
			regmap_16bit_config = &cs47l92_16bit_i2c_regmap;
			regmap_32bit_config = &cs47l92_32bit_i2c_regmap;
		}
		break;
	default:
		dev_err(&i2c->dev,
			"Unknown Madera I2C device type %ld\n", type);
		return -EINVAL;
	}

	name = madera_name_from_type(type);

	if (!regmap_16bit_config) {
		/* it's polite to say which codec isn't built into the kernel */
		dev_err(&i2c->dev,
			"Kernel does not include support for %s\n", name);
		return -EINVAL;
	}

	madera = devm_kzalloc(&i2c->dev, sizeof(*madera), GFP_KERNEL);
	if (!madera)
		return -ENOMEM;

	madera->regmap = devm_regmap_init_i2c(i2c, regmap_16bit_config);
	if (IS_ERR(madera->regmap)) {
		ret = PTR_ERR(madera->regmap);
		dev_err(&i2c->dev,
			"Failed to allocate 16-bit register map: %d\n",	ret);
		return ret;
	}

	madera->regmap_32bit = devm_regmap_init_i2c(i2c, regmap_32bit_config);
	if (IS_ERR(madera->regmap_32bit)) {
		ret = PTR_ERR(madera->regmap_32bit);
		dev_err(&i2c->dev,
			"Failed to allocate 32-bit register map: %d\n", ret);
		return ret;
	}

	madera->type = type;
	madera->type_name = name;
	madera->dev = &i2c->dev;
	madera->irq = i2c->irq;

	return madera_dev_init(madera);
}

static void madera_i2c_remove(struct i2c_client *i2c)
{
	struct madera *madera = dev_get_drvdata(&i2c->dev);

	madera_dev_exit(madera);
}

static const struct i2c_device_id madera_i2c_id[] = {
	{ "cs47l15", CS47L15 },
	{ "cs47l35", CS47L35 },
	{ "cs47l85", CS47L85 },
	{ "cs47l90", CS47L90 },
	{ "cs47l91", CS47L91 },
	{ "cs42l92", CS42L92 },

Annotation

Implementation Notes