drivers/hwmon/pmbus/xdpe12284.c

Source file repositories/reference/linux-study-clean/drivers/hwmon/pmbus/xdpe12284.c

File Facts

System
Linux kernel
Corpus path
drivers/hwmon/pmbus/xdpe12284.c
Extension
.c
Size
4993 bytes
Lines
198
Domain
Driver Families
Bucket
drivers/hwmon
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

switch (info->vrm_version[page]) {
		case vr13:
			if (val >= 500)
				return 1 + DIV_ROUND_CLOSEST(val - 500, 10);
			return 0;
		case vr12:
			if (val >= 250)
				return 1 + DIV_ROUND_CLOSEST(val - 250, 5);
			return 0;
		case imvp9:
			if (val >= 200)
				return 1 + DIV_ROUND_CLOSEST(val - 200, 10);
			return 0;
		case amd625mv:
			if (val >= 200 && val <= 1550)
				return DIV_ROUND_CLOSEST((1550 - val) * 100,
							 625);
			return 0;
		default:
			return -EINVAL;
		}
	default:
		return -ENODATA;
	}

	return 0;
}

static int xdpe122_identify(struct i2c_client *client,
			    struct pmbus_driver_info *info)
{
	u8 vout_params;
	int i, ret, vout_mode;

	vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
	if (vout_mode >= 0 && vout_mode != 0xff) {
		switch (vout_mode >> 5) {
		case 0:
			info->format[PSC_VOLTAGE_OUT] = linear;
			return 0;
		case 1:
			info->format[PSC_VOLTAGE_OUT] = vid;
			info->read_word_data = xdpe122_read_word_data;
			break;
		default:
			return -ENODEV;
		}
	}

	for (i = 0; i < XDPE122_PAGE_NUM; i++) {
		/* Read the register with VOUT scaling value.*/
		ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE);
		if (ret < 0)
			return ret;

		vout_params = ret & GENMASK(4, 0);

		switch (vout_params) {
		case XDPE122_PROT_VR12_5_10MV:
			info->vrm_version[i] = vr13;
			break;
		case XDPE122_PROT_VR12_5MV:
			info->vrm_version[i] = vr12;
			break;
		case XDPE122_PROT_IMVP9_10MV:
			info->vrm_version[i] = imvp9;
			break;
		case XDPE122_AMD_625MV:
			info->vrm_version[i] = amd625mv;
			break;
		default:
			return -EINVAL;
		}
	}

	return 0;
}

static const struct regulator_desc __maybe_unused xdpe122_reg_desc[] = {
	PMBUS_REGULATOR("vout", 0),
	PMBUS_REGULATOR("vout", 1),
};

static struct pmbus_driver_info xdpe122_info = {
	.pages = XDPE122_PAGE_NUM,
	.format[PSC_VOLTAGE_IN] = linear,
	.format[PSC_TEMPERATURE] = linear,
	.format[PSC_CURRENT_IN] = linear,
	.format[PSC_CURRENT_OUT] = linear,
	.format[PSC_POWER] = linear,

Annotation

Implementation Notes