H. Nikolaus Schaller | f144340 | 2017-02-17 12:53:32 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2016 Golden Delicious Comp. GmbH&Co. KG |
| 3 | * Nikolaus Schaller <hns@goldelico.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/i2c.h> |
| 11 | #include <linux/iio/iio.h> |
| 12 | #include "tsc2007.h" |
| 13 | |
| 14 | struct tsc2007_iio { |
| 15 | struct tsc2007 *ts; |
| 16 | }; |
| 17 | |
| 18 | #define TSC2007_CHAN_IIO(_chan, _name, _type, _chan_info) \ |
| 19 | { \ |
| 20 | .datasheet_name = _name, \ |
| 21 | .type = _type, \ |
| 22 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ |
| 23 | BIT(_chan_info), \ |
| 24 | .indexed = 1, \ |
| 25 | .channel = _chan, \ |
| 26 | } |
| 27 | |
| 28 | static const struct iio_chan_spec tsc2007_iio_channel[] = { |
| 29 | TSC2007_CHAN_IIO(0, "x", IIO_VOLTAGE, IIO_CHAN_INFO_RAW), |
| 30 | TSC2007_CHAN_IIO(1, "y", IIO_VOLTAGE, IIO_CHAN_INFO_RAW), |
| 31 | TSC2007_CHAN_IIO(2, "z1", IIO_VOLTAGE, IIO_CHAN_INFO_RAW), |
| 32 | TSC2007_CHAN_IIO(3, "z2", IIO_VOLTAGE, IIO_CHAN_INFO_RAW), |
| 33 | TSC2007_CHAN_IIO(4, "adc", IIO_VOLTAGE, IIO_CHAN_INFO_RAW), |
| 34 | TSC2007_CHAN_IIO(5, "rt", IIO_VOLTAGE, IIO_CHAN_INFO_RAW), /* Ohms? */ |
| 35 | TSC2007_CHAN_IIO(6, "pen", IIO_PRESSURE, IIO_CHAN_INFO_RAW), |
| 36 | TSC2007_CHAN_IIO(7, "temp0", IIO_TEMP, IIO_CHAN_INFO_RAW), |
| 37 | TSC2007_CHAN_IIO(8, "temp1", IIO_TEMP, IIO_CHAN_INFO_RAW), |
| 38 | }; |
| 39 | |
| 40 | static int tsc2007_read_raw(struct iio_dev *indio_dev, |
| 41 | struct iio_chan_spec const *chan, |
| 42 | int *val, int *val2, long mask) |
| 43 | { |
| 44 | struct tsc2007_iio *iio = iio_priv(indio_dev); |
| 45 | struct tsc2007 *tsc = iio->ts; |
| 46 | int adc_chan = chan->channel; |
| 47 | int ret = 0; |
| 48 | |
| 49 | if (adc_chan >= ARRAY_SIZE(tsc2007_iio_channel)) |
| 50 | return -EINVAL; |
| 51 | |
| 52 | if (mask != IIO_CHAN_INFO_RAW) |
| 53 | return -EINVAL; |
| 54 | |
| 55 | mutex_lock(&tsc->mlock); |
| 56 | |
| 57 | switch (chan->channel) { |
| 58 | case 0: |
| 59 | *val = tsc2007_xfer(tsc, READ_X); |
| 60 | break; |
| 61 | case 1: |
| 62 | *val = tsc2007_xfer(tsc, READ_Y); |
| 63 | break; |
| 64 | case 2: |
| 65 | *val = tsc2007_xfer(tsc, READ_Z1); |
| 66 | break; |
| 67 | case 3: |
| 68 | *val = tsc2007_xfer(tsc, READ_Z2); |
| 69 | break; |
| 70 | case 4: |
| 71 | *val = tsc2007_xfer(tsc, (ADC_ON_12BIT | TSC2007_MEASURE_AUX)); |
| 72 | break; |
| 73 | case 5: { |
| 74 | struct ts_event tc; |
| 75 | |
| 76 | tc.x = tsc2007_xfer(tsc, READ_X); |
| 77 | tc.z1 = tsc2007_xfer(tsc, READ_Z1); |
| 78 | tc.z2 = tsc2007_xfer(tsc, READ_Z2); |
H. Nikolaus Schaller | deec586 | 2017-02-22 23:49:02 -0800 | [diff] [blame] | 79 | *val = tsc2007_calculate_resistance(tsc, &tc); |
H. Nikolaus Schaller | f144340 | 2017-02-17 12:53:32 -0800 | [diff] [blame] | 80 | break; |
| 81 | } |
| 82 | case 6: |
| 83 | *val = tsc2007_is_pen_down(tsc); |
| 84 | break; |
| 85 | case 7: |
| 86 | *val = tsc2007_xfer(tsc, |
| 87 | (ADC_ON_12BIT | TSC2007_MEASURE_TEMP0)); |
| 88 | break; |
| 89 | case 8: |
| 90 | *val = tsc2007_xfer(tsc, |
| 91 | (ADC_ON_12BIT | TSC2007_MEASURE_TEMP1)); |
| 92 | break; |
| 93 | } |
| 94 | |
| 95 | /* Prepare for next touch reading - power down ADC, enable PENIRQ */ |
| 96 | tsc2007_xfer(tsc, PWRDOWN); |
| 97 | |
| 98 | mutex_unlock(&tsc->mlock); |
| 99 | |
| 100 | ret = IIO_VAL_INT; |
| 101 | |
| 102 | return ret; |
| 103 | } |
| 104 | |
| 105 | static const struct iio_info tsc2007_iio_info = { |
| 106 | .read_raw = tsc2007_read_raw, |
| 107 | .driver_module = THIS_MODULE, |
| 108 | }; |
| 109 | |
| 110 | int tsc2007_iio_configure(struct tsc2007 *ts) |
| 111 | { |
| 112 | struct iio_dev *indio_dev; |
| 113 | struct tsc2007_iio *iio; |
| 114 | int error; |
| 115 | |
| 116 | indio_dev = devm_iio_device_alloc(&ts->client->dev, sizeof(*iio)); |
| 117 | if (!indio_dev) { |
| 118 | dev_err(&ts->client->dev, "iio_device_alloc failed\n"); |
| 119 | return -ENOMEM; |
| 120 | } |
| 121 | |
| 122 | iio = iio_priv(indio_dev); |
| 123 | iio->ts = ts; |
| 124 | |
| 125 | indio_dev->name = "tsc2007"; |
| 126 | indio_dev->dev.parent = &ts->client->dev; |
| 127 | indio_dev->info = &tsc2007_iio_info; |
| 128 | indio_dev->modes = INDIO_DIRECT_MODE; |
| 129 | indio_dev->channels = tsc2007_iio_channel; |
| 130 | indio_dev->num_channels = ARRAY_SIZE(tsc2007_iio_channel); |
| 131 | |
| 132 | error = devm_iio_device_register(&ts->client->dev, indio_dev); |
| 133 | if (error) { |
| 134 | dev_err(&ts->client->dev, |
| 135 | "iio_device_register() failed: %d\n", error); |
| 136 | return error; |
| 137 | } |
| 138 | |
| 139 | return 0; |
| 140 | } |