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130 lines · 3.1 KiB

1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2016 Golden Delicious Comp. GmbH&Co. KG
4 * Nikolaus Schaller <[email protected]>
5 */
6
7#include <linux/i2c.h>
8#include <linux/iio/iio.h>
9#include "tsc2007.h"
10
11struct tsc2007_iio {
12 struct tsc2007 *ts;
13};
14
15#define TSC2007_CHAN_IIO(_chan, _name, _type, _chan_info) \
16{ \
17 .datasheet_name = _name, \
18 .type = _type, \
19 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
20 BIT(_chan_info), \
21 .indexed = 1, \
22 .channel = _chan, \
23}
24
25static const struct iio_chan_spec tsc2007_iio_channel[] = {
26 TSC2007_CHAN_IIO(0, "x", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
27 TSC2007_CHAN_IIO(1, "y", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
28 TSC2007_CHAN_IIO(2, "z1", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
29 TSC2007_CHAN_IIO(3, "z2", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
30 TSC2007_CHAN_IIO(4, "adc", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
31 TSC2007_CHAN_IIO(5, "rt", IIO_VOLTAGE, IIO_CHAN_INFO_RAW), /* Ohms? */
32 TSC2007_CHAN_IIO(6, "pen", IIO_PRESSURE, IIO_CHAN_INFO_RAW),
33 TSC2007_CHAN_IIO(7, "temp0", IIO_TEMP, IIO_CHAN_INFO_RAW),
34 TSC2007_CHAN_IIO(8, "temp1", IIO_TEMP, IIO_CHAN_INFO_RAW),
35};
36
37static int tsc2007_read_raw(struct iio_dev *indio_dev,
38 struct iio_chan_spec const *chan,
39 int *val, int *val2, long mask)
40{
41 struct tsc2007_iio *iio = iio_priv(indio_dev);
42 struct tsc2007 *tsc = iio->ts;
43 int adc_chan = chan->channel;
44
45 if (adc_chan >= ARRAY_SIZE(tsc2007_iio_channel))
46 return -EINVAL;
47
48 if (mask != IIO_CHAN_INFO_RAW)
49 return -EINVAL;
50
51 guard(mutex)(&tsc->mlock);
52
53 switch (chan->channel) {
54 case 0:
55 *val = tsc2007_xfer(tsc, READ_X);
56 break;
57 case 1:
58 *val = tsc2007_xfer(tsc, READ_Y);
59 break;
60 case 2:
61 *val = tsc2007_xfer(tsc, READ_Z1);
62 break;
63 case 3:
64 *val = tsc2007_xfer(tsc, READ_Z2);
65 break;
66 case 4:
67 *val = tsc2007_xfer(tsc, (ADC_ON_12BIT | TSC2007_MEASURE_AUX));
68 break;
69 case 5: {
70 struct ts_event tc;
71
72 tc.x = tsc2007_xfer(tsc, READ_X);
73 tc.z1 = tsc2007_xfer(tsc, READ_Z1);
74 tc.z2 = tsc2007_xfer(tsc, READ_Z2);
75 *val = tsc2007_calculate_resistance(tsc, &tc);
76 break;
77 }
78 case 6:
79 *val = tsc2007_is_pen_down(tsc);
80 break;
81 case 7:
82 *val = tsc2007_xfer(tsc,
83 (ADC_ON_12BIT | TSC2007_MEASURE_TEMP0));
84 break;
85 case 8:
86 *val = tsc2007_xfer(tsc,
87 (ADC_ON_12BIT | TSC2007_MEASURE_TEMP1));
88 break;
89 }
90
91 /* Prepare for next touch reading - power down ADC, enable PENIRQ */
92 tsc2007_xfer(tsc, PWRDOWN);
93
94 return IIO_VAL_INT;
95}
96
97static const struct iio_info tsc2007_iio_info = {
98 .read_raw = tsc2007_read_raw,
99};
100
101int tsc2007_iio_configure(struct tsc2007 *ts)
102{
103 struct iio_dev *indio_dev;
104 struct tsc2007_iio *iio;
105 int error;
106
107 indio_dev = devm_iio_device_alloc(&ts->client->dev, sizeof(*iio));
108 if (!indio_dev) {
109 dev_err(&ts->client->dev, "iio_device_alloc failed\n");
110 return -ENOMEM;
111 }
112
113 iio = iio_priv(indio_dev);
114 iio->ts = ts;
115
116 indio_dev->name = "tsc2007";
117 indio_dev->info = &tsc2007_iio_info;
118 indio_dev->modes = INDIO_DIRECT_MODE;
119 indio_dev->channels = tsc2007_iio_channel;
120 indio_dev->num_channels = ARRAY_SIZE(tsc2007_iio_channel);
121
122 error = devm_iio_device_register(&ts->client->dev, indio_dev);
123 if (error) {
124 dev_err(&ts->client->dev,
125 "iio_device_register() failed: %d\n", error);
126 return error;
127 }
128
129 return 0;
130}