drivers/iio/accel/adis16209.c

Source file repositories/reference/linux-study-clean/drivers/iio/accel/adis16209.c

File Facts

System
Linux kernel
Corpus path
drivers/iio/accel/adis16209.c
Extension
.c
Size
8622 bytes
Lines
314
Domain
Driver Families
Bucket
drivers/iio
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 (chan->type) {
		case IIO_VOLTAGE:
			*val = 0;
			switch (chan->channel) {
			case 0:
				*val2 = 305180; /* 0.30518 mV */
				break;
			case 1:
				*val2 = 610500; /* 0.6105 mV */
				break;
			default:
				return -EINVAL;
			}
			return IIO_VAL_INT_PLUS_MICRO;
		case IIO_TEMP:
			*val = -470;
			*val2 = 0;
			return IIO_VAL_INT_PLUS_MICRO;
		case IIO_ACCEL:
			/*
			 * IIO base unit for sensitivity of accelerometer
			 * is milli g.
			 * 1 LSB represents 0.244 mg.
			 */
			*val = 0;
			*val2 = IIO_G_TO_M_S_2(244140);
			return IIO_VAL_INT_PLUS_NANO;
		case IIO_INCLI:
		case IIO_ROT:
			/*
			 * IIO base units for rotation are degrees.
			 * 1 LSB represents 0.025 milli degrees.
			 */
			*val = 0;
			*val2 = 25000;
			return IIO_VAL_INT_PLUS_MICRO;
		default:
			return -EINVAL;
		}
		break;
	case IIO_CHAN_INFO_OFFSET:
		/*
		 * The raw ADC value is 0x4FE when the temperature
		 * is 45 degrees and the scale factor per milli
		 * degree Celsius is -470.
		 */
		*val = 25000 / -470 - 0x4FE;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_CALIBBIAS:
		switch (chan->type) {
		case IIO_ACCEL:
			bits = 14;
			break;
		default:
			return -EINVAL;
		}
		addr = adis16209_addresses[chan->scan_index][0];
		ret = adis_read_reg_16(st, addr, &val16);
		if (ret)
			return ret;

		*val = sign_extend32(val16, bits - 1);
		return IIO_VAL_INT;
	}
	return -EINVAL;
}

static const struct iio_chan_spec adis16209_channels[] = {
	ADIS_SUPPLY_CHAN(ADIS16209_SUPPLY_OUT_REG, ADIS16209_SCAN_SUPPLY,
			 0, 14),
	ADIS_TEMP_CHAN(ADIS16209_TEMP_OUT_REG, ADIS16209_SCAN_TEMP, 0, 12),
	ADIS_ACCEL_CHAN(X, ADIS16209_XACCL_OUT_REG, ADIS16209_SCAN_ACC_X,
			BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
	ADIS_ACCEL_CHAN(Y, ADIS16209_YACCL_OUT_REG, ADIS16209_SCAN_ACC_Y,
			BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
	ADIS_AUX_ADC_CHAN(ADIS16209_AUX_ADC_REG, ADIS16209_SCAN_AUX_ADC, 0, 12),
	ADIS_INCLI_CHAN(X, ADIS16209_XINCL_OUT_REG, ADIS16209_SCAN_INCLI_X,
			0, 0, 14),
	ADIS_INCLI_CHAN(Y, ADIS16209_YINCL_OUT_REG, ADIS16209_SCAN_INCLI_Y,
			0, 0, 14),
	ADIS_ROT_CHAN(X, ADIS16209_ROT_OUT_REG, ADIS16209_SCAN_ROT, 0, 0, 14),
	IIO_CHAN_SOFT_TIMESTAMP(8)
};

static const struct iio_info adis16209_info = {
	.read_raw = adis16209_read_raw,
	.write_raw = adis16209_write_raw,
	.update_scan_mode = adis_update_scan_mode,
};

Annotation

Implementation Notes