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/*
* Copyright (c) 2016 Golden Delicious Comp. GmbH&Co. KG
* Nikolaus Schaller <hns@goldelico.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/i2c.h>
#include <linux/iio/iio.h>
#include "tsc2007.h"
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;
int ret = 0;
if (adc_chan >= ARRAY_SIZE(tsc2007_iio_channel))
return -EINVAL;
if (mask != IIO_CHAN_INFO_RAW)
return -EINVAL;
mutex_lock(&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);
mutex_unlock(&tsc->mlock);
ret = IIO_VAL_INT;
return ret;
}
static const struct iio_info tsc2007_iio_info = {
.read_raw = tsc2007_read_raw,
.driver_module = THIS_MODULE,
};
int tsc2007_iio_configure(struct tsc2007 *ts)
{
struct iio_dev *indio_dev;
struct tsc2007_iio *iio;
int error;
indio_dev = devm_iio_device_alloc(&ts->client->dev, sizeof(*iio));
if (!indio_dev) {
dev_err(&ts->client->dev, "iio_device_alloc failed\n");
return -ENOMEM;
}
iio = iio_priv(indio_dev);
iio->ts = ts;
indio_dev->name = "tsc2007";
indio_dev->dev.parent = &ts->client->dev;
indio_dev->info = &tsc2007_iio_info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = tsc2007_iio_channel;
indio_dev->num_channels = ARRAY_SIZE(tsc2007_iio_channel);
error = devm_iio_device_register(&ts->client->dev, indio_dev);
if (error) {
dev_err(&ts->client->dev,
"iio_device_register() failed: %d\n", error);
return error;
}
return 0;
}
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