projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| f1443404 NS |
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); | |
| deec586d | 79 | *val = tsc2007_calculate_resistance(tsc, &tc); |
| f1443404 NS |
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 | } |