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.
- 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.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/i2c.hlinux/iio/iio.htsc2007.h
Detected Declarations
struct tsc2007_iiofunction tsc2007_read_rawfunction tsc2007_iio_configure
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
- Immediate include surface: `linux/i2c.h`, `linux/iio/iio.h`, `tsc2007.h`.
- Detected declarations: `struct tsc2007_iio`, `function tsc2007_read_raw`, `function tsc2007_iio_configure`.
- Atlas domain: Driver Families / drivers/input.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.