drivers/input/touchscreen/tsc2007_iio.c

Source file repositories/reference/linux-study-clean/drivers/input/touchscreen/tsc2007_iio.c

File Facts

System
Linux kernel
Corpus path
drivers/input/touchscreen/tsc2007_iio.c
Extension
.c
Size
3218 bytes
Lines
131
Domain
Driver Families
Bucket
drivers/input
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 tsc2007_iio {
	struct tsc2007 *ts;
};

#define TSC2007_CHAN_IIO(_chan, _name, _type, _chan_info) \
{ \
	.datasheet_name = _name, \
	.type = _type, \
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |	\
			BIT(_chan_info), \
	.indexed = 1, \
	.channel = _chan, \
}

static const struct iio_chan_spec tsc2007_iio_channel[] = {
	TSC2007_CHAN_IIO(0, "x", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
	TSC2007_CHAN_IIO(1, "y", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
	TSC2007_CHAN_IIO(2, "z1", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
	TSC2007_CHAN_IIO(3, "z2", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
	TSC2007_CHAN_IIO(4, "adc", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
	TSC2007_CHAN_IIO(5, "rt", IIO_VOLTAGE, IIO_CHAN_INFO_RAW), /* Ohms? */
	TSC2007_CHAN_IIO(6, "pen", IIO_PRESSURE, IIO_CHAN_INFO_RAW),
	TSC2007_CHAN_IIO(7, "temp0", IIO_TEMP, IIO_CHAN_INFO_RAW),
	TSC2007_CHAN_IIO(8, "temp1", IIO_TEMP, IIO_CHAN_INFO_RAW),
};

static int tsc2007_read_raw(struct iio_dev *indio_dev,
			    struct iio_chan_spec const *chan,
			    int *val, int *val2, long mask)
{
	struct tsc2007_iio *iio = iio_priv(indio_dev);
	struct tsc2007 *tsc = iio->ts;
	int adc_chan = chan->channel;

	if (adc_chan >= ARRAY_SIZE(tsc2007_iio_channel))
		return -EINVAL;

	if (mask != IIO_CHAN_INFO_RAW)
		return -EINVAL;

	guard(mutex)(&tsc->mlock);

	switch (chan->channel) {
	case 0:
		*val = tsc2007_xfer(tsc, READ_X);
		break;
	case 1:
		*val = tsc2007_xfer(tsc, READ_Y);
		break;
	case 2:
		*val = tsc2007_xfer(tsc, READ_Z1);
		break;
	case 3:
		*val = tsc2007_xfer(tsc, READ_Z2);
		break;
	case 4:
		*val = tsc2007_xfer(tsc, (ADC_ON_12BIT | TSC2007_MEASURE_AUX));
		break;
	case 5: {
		struct ts_event tc;

		tc.x = tsc2007_xfer(tsc, READ_X);
		tc.z1 = tsc2007_xfer(tsc, READ_Z1);
		tc.z2 = tsc2007_xfer(tsc, READ_Z2);
		*val = tsc2007_calculate_resistance(tsc, &tc);
		break;
	}
	case 6:
		*val = tsc2007_is_pen_down(tsc);
		break;
	case 7:
		*val = tsc2007_xfer(tsc,
				    (ADC_ON_12BIT | TSC2007_MEASURE_TEMP0));
		break;
	case 8:
		*val = tsc2007_xfer(tsc,
				    (ADC_ON_12BIT | TSC2007_MEASURE_TEMP1));
		break;
	}

	/* Prepare for next touch reading - power down ADC, enable PENIRQ */
	tsc2007_xfer(tsc, PWRDOWN);

	return IIO_VAL_INT;
}

static const struct iio_info tsc2007_iio_info = {
	.read_raw = tsc2007_read_raw,
};

Annotation

Implementation Notes