drivers/hwmon/pmbus/dps920ab.c

Source file repositories/reference/linux-study-clean/drivers/hwmon/pmbus/dps920ab.c

File Facts

System
Linux kernel
Corpus path
drivers/hwmon/pmbus/dps920ab.c
Extension
.c
Size
5104 bytes
Lines
214
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

struct dps920ab_data {
	char *mfr_model;
	char *mfr_id;
};

static int dps920ab_read_word_data(struct i2c_client *client, int page, int phase, int reg)
{
	/*
	 * This masks commands which are not supported.
	 * PSU advertises that all features are supported,
	 * in reality that unfortunately is not true.
	 * So enable only those that the datasheet confirms.
	 */
	switch (reg) {
	case PMBUS_FAN_COMMAND_1:
	case PMBUS_IOUT_OC_WARN_LIMIT:
	case PMBUS_STATUS_WORD:
	case PMBUS_READ_VIN:
	case PMBUS_READ_IIN:
	case PMBUS_READ_VOUT:
	case PMBUS_READ_IOUT:
	case PMBUS_READ_TEMPERATURE_1:
	case PMBUS_READ_TEMPERATURE_2:
	case PMBUS_READ_TEMPERATURE_3:
	case PMBUS_READ_FAN_SPEED_1:
	case PMBUS_READ_POUT:
	case PMBUS_READ_PIN:
	case PMBUS_MFR_VOUT_MIN:
	case PMBUS_MFR_VOUT_MAX:
	case PMBUS_MFR_IOUT_MAX:
	case PMBUS_MFR_POUT_MAX:
		return pmbus_read_word_data(client, page, phase, reg);
	default:
		return -ENXIO;
	}
}

static int dps920ab_write_word_data(struct i2c_client *client, int page, int reg,
				    u16 word)
{
	/*
	 * This masks commands which are not supported.
	 * PSU only has one R/W register and that is
	 * for the fan.
	 */
	switch (reg) {
	case PMBUS_FAN_COMMAND_1:
		return pmbus_write_word_data(client, page, reg, word);
	default:
		return -EACCES;
	}
}

static struct pmbus_driver_info dps920ab_info = {
	.pages = 1,

	.format[PSC_VOLTAGE_IN] = linear,
	.format[PSC_VOLTAGE_OUT] = linear,
	.format[PSC_CURRENT_IN] = linear,
	.format[PSC_CURRENT_OUT] = linear,
	.format[PSC_POWER] = linear,
	.format[PSC_FAN] = linear,
	.format[PSC_TEMPERATURE] = linear,

	.func[0] =
		PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN |
		PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT |
		PMBUS_HAVE_TEMP  | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
		PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12 |
		PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
		PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
	.read_word_data = dps920ab_read_word_data,
	.write_word_data = dps920ab_write_word_data,
};

static int dps920ab_mfr_id_show(struct seq_file *s, void *data)
{
	struct dps920ab_data *priv = s->private;

	seq_printf(s, "%s\n", priv->mfr_id);

	return 0;
}

DEFINE_SHOW_ATTRIBUTE(dps920ab_mfr_id);

static int dps920ab_mfr_model_show(struct seq_file *s, void *data)
{
	struct dps920ab_data *priv = s->private;

Annotation

Implementation Notes