1f1443404SH. Nikolaus Schaller /* 2f1443404SH. Nikolaus Schaller * Copyright (c) 2016 Golden Delicious Comp. GmbH&Co. KG 3f1443404SH. Nikolaus Schaller * Nikolaus Schaller <hns@goldelico.com> 4f1443404SH. Nikolaus Schaller * 5f1443404SH. Nikolaus Schaller * This program is free software; you can redistribute it and/or modify 6f1443404SH. Nikolaus Schaller * it under the terms of the GNU General Public License version 2 as 7f1443404SH. Nikolaus Schaller * published by the Free Software Foundation. 8f1443404SH. Nikolaus Schaller */ 9f1443404SH. Nikolaus Schaller 10f1443404SH. Nikolaus Schaller #include <linux/i2c.h> 11f1443404SH. Nikolaus Schaller #include <linux/iio/iio.h> 12f1443404SH. Nikolaus Schaller #include "tsc2007.h" 13f1443404SH. Nikolaus Schaller 14f1443404SH. Nikolaus Schaller struct tsc2007_iio { 15f1443404SH. Nikolaus Schaller struct tsc2007 *ts; 16f1443404SH. Nikolaus Schaller }; 17f1443404SH. Nikolaus Schaller 18f1443404SH. Nikolaus Schaller #define TSC2007_CHAN_IIO(_chan, _name, _type, _chan_info) \ 19f1443404SH. Nikolaus Schaller { \ 20f1443404SH. Nikolaus Schaller .datasheet_name = _name, \ 21f1443404SH. Nikolaus Schaller .type = _type, \ 22f1443404SH. Nikolaus Schaller .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ 23f1443404SH. Nikolaus Schaller BIT(_chan_info), \ 24f1443404SH. Nikolaus Schaller .indexed = 1, \ 25f1443404SH. Nikolaus Schaller .channel = _chan, \ 26f1443404SH. Nikolaus Schaller } 27f1443404SH. Nikolaus Schaller 28f1443404SH. Nikolaus Schaller static const struct iio_chan_spec tsc2007_iio_channel[] = { 29f1443404SH. Nikolaus Schaller TSC2007_CHAN_IIO(0, "x", IIO_VOLTAGE, IIO_CHAN_INFO_RAW), 30f1443404SH. Nikolaus Schaller TSC2007_CHAN_IIO(1, "y", IIO_VOLTAGE, IIO_CHAN_INFO_RAW), 31f1443404SH. Nikolaus Schaller TSC2007_CHAN_IIO(2, "z1", IIO_VOLTAGE, IIO_CHAN_INFO_RAW), 32f1443404SH. Nikolaus Schaller TSC2007_CHAN_IIO(3, "z2", IIO_VOLTAGE, IIO_CHAN_INFO_RAW), 33f1443404SH. Nikolaus Schaller TSC2007_CHAN_IIO(4, "adc", IIO_VOLTAGE, IIO_CHAN_INFO_RAW), 34f1443404SH. Nikolaus Schaller TSC2007_CHAN_IIO(5, "rt", IIO_VOLTAGE, IIO_CHAN_INFO_RAW), /* Ohms? */ 35f1443404SH. Nikolaus Schaller TSC2007_CHAN_IIO(6, "pen", IIO_PRESSURE, IIO_CHAN_INFO_RAW), 36f1443404SH. Nikolaus Schaller TSC2007_CHAN_IIO(7, "temp0", IIO_TEMP, IIO_CHAN_INFO_RAW), 37f1443404SH. Nikolaus Schaller TSC2007_CHAN_IIO(8, "temp1", IIO_TEMP, IIO_CHAN_INFO_RAW), 38f1443404SH. Nikolaus Schaller }; 39f1443404SH. Nikolaus Schaller 40f1443404SH. Nikolaus Schaller static int tsc2007_read_raw(struct iio_dev *indio_dev, 41f1443404SH. Nikolaus Schaller struct iio_chan_spec const *chan, 42f1443404SH. Nikolaus Schaller int *val, int *val2, long mask) 43f1443404SH. Nikolaus Schaller { 44f1443404SH. Nikolaus Schaller struct tsc2007_iio *iio = iio_priv(indio_dev); 45f1443404SH. Nikolaus Schaller struct tsc2007 *tsc = iio->ts; 46f1443404SH. Nikolaus Schaller int adc_chan = chan->channel; 47f1443404SH. Nikolaus Schaller int ret = 0; 48f1443404SH. Nikolaus Schaller 49f1443404SH. Nikolaus Schaller if (adc_chan >= ARRAY_SIZE(tsc2007_iio_channel)) 50f1443404SH. Nikolaus Schaller return -EINVAL; 51f1443404SH. Nikolaus Schaller 52f1443404SH. Nikolaus Schaller if (mask != IIO_CHAN_INFO_RAW) 53f1443404SH. Nikolaus Schaller return -EINVAL; 54f1443404SH. Nikolaus Schaller 55f1443404SH. Nikolaus Schaller mutex_lock(&tsc->mlock); 56f1443404SH. Nikolaus Schaller 57f1443404SH. Nikolaus Schaller switch (chan->channel) { 58f1443404SH. Nikolaus Schaller case 0: 59f1443404SH. Nikolaus Schaller *val = tsc2007_xfer(tsc, READ_X); 60f1443404SH. Nikolaus Schaller break; 61f1443404SH. Nikolaus Schaller case 1: 62f1443404SH. Nikolaus Schaller *val = tsc2007_xfer(tsc, READ_Y); 63f1443404SH. Nikolaus Schaller break; 64f1443404SH. Nikolaus Schaller case 2: 65f1443404SH. Nikolaus Schaller *val = tsc2007_xfer(tsc, READ_Z1); 66f1443404SH. Nikolaus Schaller break; 67f1443404SH. Nikolaus Schaller case 3: 68f1443404SH. Nikolaus Schaller *val = tsc2007_xfer(tsc, READ_Z2); 69f1443404SH. Nikolaus Schaller break; 70f1443404SH. Nikolaus Schaller case 4: 71f1443404SH. Nikolaus Schaller *val = tsc2007_xfer(tsc, (ADC_ON_12BIT | TSC2007_MEASURE_AUX)); 72f1443404SH. Nikolaus Schaller break; 73f1443404SH. Nikolaus Schaller case 5: { 74f1443404SH. Nikolaus Schaller struct ts_event tc; 75f1443404SH. Nikolaus Schaller 76f1443404SH. Nikolaus Schaller tc.x = tsc2007_xfer(tsc, READ_X); 77f1443404SH. Nikolaus Schaller tc.z1 = tsc2007_xfer(tsc, READ_Z1); 78f1443404SH. Nikolaus Schaller tc.z2 = tsc2007_xfer(tsc, READ_Z2); 79deec586dSH. Nikolaus Schaller *val = tsc2007_calculate_resistance(tsc, &tc); 80f1443404SH. Nikolaus Schaller break; 81f1443404SH. Nikolaus Schaller } 82f1443404SH. Nikolaus Schaller case 6: 83f1443404SH. Nikolaus Schaller *val = tsc2007_is_pen_down(tsc); 84f1443404SH. Nikolaus Schaller break; 85f1443404SH. Nikolaus Schaller case 7: 86f1443404SH. Nikolaus Schaller *val = tsc2007_xfer(tsc, 87f1443404SH. Nikolaus Schaller (ADC_ON_12BIT | TSC2007_MEASURE_TEMP0)); 88f1443404SH. Nikolaus Schaller break; 89f1443404SH. Nikolaus Schaller case 8: 90f1443404SH. Nikolaus Schaller *val = tsc2007_xfer(tsc, 91f1443404SH. Nikolaus Schaller (ADC_ON_12BIT | TSC2007_MEASURE_TEMP1)); 92f1443404SH. Nikolaus Schaller break; 93f1443404SH. Nikolaus Schaller } 94f1443404SH. Nikolaus Schaller 95f1443404SH. Nikolaus Schaller /* Prepare for next touch reading - power down ADC, enable PENIRQ */ 96f1443404SH. Nikolaus Schaller tsc2007_xfer(tsc, PWRDOWN); 97f1443404SH. Nikolaus Schaller 98f1443404SH. Nikolaus Schaller mutex_unlock(&tsc->mlock); 99f1443404SH. Nikolaus Schaller 100f1443404SH. Nikolaus Schaller ret = IIO_VAL_INT; 101f1443404SH. Nikolaus Schaller 102f1443404SH. Nikolaus Schaller return ret; 103f1443404SH. Nikolaus Schaller } 104f1443404SH. Nikolaus Schaller 105f1443404SH. Nikolaus Schaller static const struct iio_info tsc2007_iio_info = { 106f1443404SH. Nikolaus Schaller .read_raw = tsc2007_read_raw, 107f1443404SH. Nikolaus Schaller .driver_module = THIS_MODULE, 108f1443404SH. Nikolaus Schaller }; 109f1443404SH. Nikolaus Schaller 110f1443404SH. Nikolaus Schaller int tsc2007_iio_configure(struct tsc2007 *ts) 111f1443404SH. Nikolaus Schaller { 112f1443404SH. Nikolaus Schaller struct iio_dev *indio_dev; 113f1443404SH. Nikolaus Schaller struct tsc2007_iio *iio; 114f1443404SH. Nikolaus Schaller int error; 115f1443404SH. Nikolaus Schaller 116f1443404SH. Nikolaus Schaller indio_dev = devm_iio_device_alloc(&ts->client->dev, sizeof(*iio)); 117f1443404SH. Nikolaus Schaller if (!indio_dev) { 118f1443404SH. Nikolaus Schaller dev_err(&ts->client->dev, "iio_device_alloc failed\n"); 119f1443404SH. Nikolaus Schaller return -ENOMEM; 120f1443404SH. Nikolaus Schaller } 121f1443404SH. Nikolaus Schaller 122f1443404SH. Nikolaus Schaller iio = iio_priv(indio_dev); 123f1443404SH. Nikolaus Schaller iio->ts = ts; 124f1443404SH. Nikolaus Schaller 125f1443404SH. Nikolaus Schaller indio_dev->name = "tsc2007"; 126f1443404SH. Nikolaus Schaller indio_dev->dev.parent = &ts->client->dev; 127f1443404SH. Nikolaus Schaller indio_dev->info = &tsc2007_iio_info; 128f1443404SH. Nikolaus Schaller indio_dev->modes = INDIO_DIRECT_MODE; 129f1443404SH. Nikolaus Schaller indio_dev->channels = tsc2007_iio_channel; 130f1443404SH. Nikolaus Schaller indio_dev->num_channels = ARRAY_SIZE(tsc2007_iio_channel); 131f1443404SH. Nikolaus Schaller 132f1443404SH. Nikolaus Schaller error = devm_iio_device_register(&ts->client->dev, indio_dev); 133f1443404SH. Nikolaus Schaller if (error) { 134f1443404SH. Nikolaus Schaller dev_err(&ts->client->dev, 135f1443404SH. Nikolaus Schaller "iio_device_register() failed: %d\n", error); 136f1443404SH. Nikolaus Schaller return error; 137f1443404SH. Nikolaus Schaller } 138f1443404SH. Nikolaus Schaller 139f1443404SH. Nikolaus Schaller return 0; 140f1443404SH. Nikolaus Schaller } 141