diff options
Diffstat (limited to 'drivers/input/touchscreen/tsc2007_iio.c')
| -rw-r--r-- | drivers/input/touchscreen/tsc2007_iio.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/tsc2007_iio.c b/drivers/input/touchscreen/tsc2007_iio.c new file mode 100644 index 000000000000..27b25a9fce83 --- /dev/null +++ b/drivers/input/touchscreen/tsc2007_iio.c @@ -0,0 +1,140 @@ +/* + * 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; +} |