136 lines
3.2 KiB
C
136 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2016 Golden Delicious Comp. GmbH&Co. KG
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* Nikolaus Schaller <hns@goldelico.com>
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*/
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#include <linux/i2c.h>
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#include <linux/iio/iio.h>
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#include "tsc2007.h"
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struct tsc2007_iio {
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struct tsc2007 *ts;
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};
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#define TSC2007_CHAN_IIO(_chan, _name, _type, _chan_info) \
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{ \
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.datasheet_name = _name, \
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.type = _type, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
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BIT(_chan_info), \
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.indexed = 1, \
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.channel = _chan, \
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}
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static const struct iio_chan_spec tsc2007_iio_channel[] = {
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TSC2007_CHAN_IIO(0, "x", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
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TSC2007_CHAN_IIO(1, "y", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
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TSC2007_CHAN_IIO(2, "z1", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
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TSC2007_CHAN_IIO(3, "z2", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
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TSC2007_CHAN_IIO(4, "adc", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
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TSC2007_CHAN_IIO(5, "rt", IIO_VOLTAGE, IIO_CHAN_INFO_RAW), /* Ohms? */
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TSC2007_CHAN_IIO(6, "pen", IIO_PRESSURE, IIO_CHAN_INFO_RAW),
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TSC2007_CHAN_IIO(7, "temp0", IIO_TEMP, IIO_CHAN_INFO_RAW),
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TSC2007_CHAN_IIO(8, "temp1", IIO_TEMP, IIO_CHAN_INFO_RAW),
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};
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static int tsc2007_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct tsc2007_iio *iio = iio_priv(indio_dev);
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struct tsc2007 *tsc = iio->ts;
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int adc_chan = chan->channel;
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int ret = 0;
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if (adc_chan >= ARRAY_SIZE(tsc2007_iio_channel))
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return -EINVAL;
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if (mask != IIO_CHAN_INFO_RAW)
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return -EINVAL;
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mutex_lock(&tsc->mlock);
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switch (chan->channel) {
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case 0:
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*val = tsc2007_xfer(tsc, READ_X);
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break;
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case 1:
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*val = tsc2007_xfer(tsc, READ_Y);
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break;
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case 2:
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*val = tsc2007_xfer(tsc, READ_Z1);
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break;
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case 3:
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*val = tsc2007_xfer(tsc, READ_Z2);
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break;
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case 4:
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*val = tsc2007_xfer(tsc, (ADC_ON_12BIT | TSC2007_MEASURE_AUX));
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break;
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case 5: {
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struct ts_event tc;
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tc.x = tsc2007_xfer(tsc, READ_X);
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tc.z1 = tsc2007_xfer(tsc, READ_Z1);
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tc.z2 = tsc2007_xfer(tsc, READ_Z2);
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*val = tsc2007_calculate_resistance(tsc, &tc);
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break;
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}
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case 6:
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*val = tsc2007_is_pen_down(tsc);
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break;
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case 7:
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*val = tsc2007_xfer(tsc,
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(ADC_ON_12BIT | TSC2007_MEASURE_TEMP0));
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break;
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case 8:
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*val = tsc2007_xfer(tsc,
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(ADC_ON_12BIT | TSC2007_MEASURE_TEMP1));
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break;
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}
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/* Prepare for next touch reading - power down ADC, enable PENIRQ */
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tsc2007_xfer(tsc, PWRDOWN);
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mutex_unlock(&tsc->mlock);
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ret = IIO_VAL_INT;
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return ret;
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}
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static const struct iio_info tsc2007_iio_info = {
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.read_raw = tsc2007_read_raw,
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};
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int tsc2007_iio_configure(struct tsc2007 *ts)
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{
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struct iio_dev *indio_dev;
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struct tsc2007_iio *iio;
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int error;
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indio_dev = devm_iio_device_alloc(&ts->client->dev, sizeof(*iio));
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if (!indio_dev) {
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dev_err(&ts->client->dev, "iio_device_alloc failed\n");
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return -ENOMEM;
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}
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iio = iio_priv(indio_dev);
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iio->ts = ts;
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indio_dev->name = "tsc2007";
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indio_dev->info = &tsc2007_iio_info;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels = tsc2007_iio_channel;
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indio_dev->num_channels = ARRAY_SIZE(tsc2007_iio_channel);
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error = devm_iio_device_register(&ts->client->dev, indio_dev);
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if (error) {
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dev_err(&ts->client->dev,
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"iio_device_register() failed: %d\n", error);
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return error;
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}
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return 0;
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}
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