1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright (c) 2016 Golden Delicious Comp. GmbH&Co. KG |
4 | * Nikolaus Schaller <hns@goldelico.com> |
5 | */ |
6 | |
7 | #include <linux/i2c.h> |
8 | #include <linux/iio/iio.h> |
9 | #include "tsc2007.h" |
10 | |
11 | struct 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 | |
25 | static 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 | |
37 | static 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 | int ret = 0; |
45 | |
46 | if (adc_chan >= ARRAY_SIZE(tsc2007_iio_channel)) |
47 | return -EINVAL; |
48 | |
49 | if (mask != IIO_CHAN_INFO_RAW) |
50 | return -EINVAL; |
51 | |
52 | mutex_lock(&tsc->mlock); |
53 | |
54 | switch (chan->channel) { |
55 | case 0: |
56 | *val = tsc2007_xfer(tsc, READ_X); |
57 | break; |
58 | case 1: |
59 | *val = tsc2007_xfer(tsc, READ_Y); |
60 | break; |
61 | case 2: |
62 | *val = tsc2007_xfer(tsc, READ_Z1); |
63 | break; |
64 | case 3: |
65 | *val = tsc2007_xfer(tsc, READ_Z2); |
66 | break; |
67 | case 4: |
68 | *val = tsc2007_xfer(tsc, cmd: (ADC_ON_12BIT | TSC2007_MEASURE_AUX)); |
69 | break; |
70 | case 5: { |
71 | struct ts_event tc; |
72 | |
73 | tc.x = tsc2007_xfer(tsc, READ_X); |
74 | tc.z1 = tsc2007_xfer(tsc, READ_Z1); |
75 | tc.z2 = tsc2007_xfer(tsc, READ_Z2); |
76 | *val = tsc2007_calculate_resistance(tsc, tc: &tc); |
77 | break; |
78 | } |
79 | case 6: |
80 | *val = tsc2007_is_pen_down(ts: tsc); |
81 | break; |
82 | case 7: |
83 | *val = tsc2007_xfer(tsc, |
84 | cmd: (ADC_ON_12BIT | TSC2007_MEASURE_TEMP0)); |
85 | break; |
86 | case 8: |
87 | *val = tsc2007_xfer(tsc, |
88 | cmd: (ADC_ON_12BIT | TSC2007_MEASURE_TEMP1)); |
89 | break; |
90 | } |
91 | |
92 | /* Prepare for next touch reading - power down ADC, enable PENIRQ */ |
93 | tsc2007_xfer(tsc, PWRDOWN); |
94 | |
95 | mutex_unlock(lock: &tsc->mlock); |
96 | |
97 | ret = IIO_VAL_INT; |
98 | |
99 | return ret; |
100 | } |
101 | |
102 | static const struct iio_info tsc2007_iio_info = { |
103 | .read_raw = tsc2007_read_raw, |
104 | }; |
105 | |
106 | int tsc2007_iio_configure(struct tsc2007 *ts) |
107 | { |
108 | struct iio_dev *indio_dev; |
109 | struct tsc2007_iio *iio; |
110 | int error; |
111 | |
112 | indio_dev = devm_iio_device_alloc(parent: &ts->client->dev, sizeof_priv: sizeof(*iio)); |
113 | if (!indio_dev) { |
114 | dev_err(&ts->client->dev, "iio_device_alloc failed\n" ); |
115 | return -ENOMEM; |
116 | } |
117 | |
118 | iio = iio_priv(indio_dev); |
119 | iio->ts = ts; |
120 | |
121 | indio_dev->name = "tsc2007" ; |
122 | indio_dev->info = &tsc2007_iio_info; |
123 | indio_dev->modes = INDIO_DIRECT_MODE; |
124 | indio_dev->channels = tsc2007_iio_channel; |
125 | indio_dev->num_channels = ARRAY_SIZE(tsc2007_iio_channel); |
126 | |
127 | error = devm_iio_device_register(&ts->client->dev, indio_dev); |
128 | if (error) { |
129 | dev_err(&ts->client->dev, |
130 | "iio_device_register() failed: %d\n" , error); |
131 | return error; |
132 | } |
133 | |
134 | return 0; |
135 | } |
136 | |