1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2016 Golden Delicious Comp. GmbH&Co. KG
* Nikolaus Schaller <hns@goldelico.com>
*/
#include <linux/i2c.h>
#include <linux/iio/iio.h>
#include "tsc2007.h"
struct tsc2007_iio {
struct tsc2007 *ts;
};
#define TSC2007_CHAN_IIO(_chan, _name, _type, _chan_info) \
{ \
.datasheet_name = _name, \
.type = _type, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(_chan_info), \
.indexed = 1, \
.channel = _chan, \
}
static const struct iio_chan_spec tsc2007_iio_channel[] = {
TSC2007_CHAN_IIO(0, "x", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
TSC2007_CHAN_IIO(1, "y", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
TSC2007_CHAN_IIO(2, "z1", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
TSC2007_CHAN_IIO(3, "z2", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
TSC2007_CHAN_IIO(4, "adc", IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
TSC2007_CHAN_IIO(5, "rt", IIO_VOLTAGE, IIO_CHAN_INFO_RAW), /* Ohms? */
TSC2007_CHAN_IIO(6, "pen", IIO_PRESSURE, IIO_CHAN_INFO_RAW),
TSC2007_CHAN_IIO(7, "temp0", IIO_TEMP, IIO_CHAN_INFO_RAW),
TSC2007_CHAN_IIO(8, "temp1", IIO_TEMP, IIO_CHAN_INFO_RAW),
};
static int tsc2007_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct tsc2007_iio *iio = iio_priv(indio_dev);
struct tsc2007 *tsc = iio->ts;
int adc_chan = chan->channel;
int ret = 0;
if (adc_chan >= ARRAY_SIZE(tsc2007_iio_channel))
return -EINVAL;
if (mask != IIO_CHAN_INFO_RAW)
return -EINVAL;
mutex_lock(&tsc->mlock);
switch (chan->channel) {
case 0:
*val = tsc2007_xfer(tsc, READ_X);
break;
case 1:
*val = tsc2007_xfer(tsc, READ_Y);
break;
case 2:
*val = tsc2007_xfer(tsc, READ_Z1);
break;
case 3:
*val = tsc2007_xfer(tsc, READ_Z2);
break;
case 4:
*val = tsc2007_xfer(tsc, (ADC_ON_12BIT | TSC2007_MEASURE_AUX));
break;
case 5: {
struct ts_event tc;
tc.x = tsc2007_xfer(tsc, READ_X);
tc.z1 = tsc2007_xfer(tsc, READ_Z1);
tc.z2 = tsc2007_xfer(tsc, READ_Z2);
*val = tsc2007_calculate_resistance(tsc, &tc);
break;
}
case 6:
*val = tsc2007_is_pen_down(tsc);
break;
case 7:
*val = tsc2007_xfer(tsc,
(ADC_ON_12BIT | TSC2007_MEASURE_TEMP0));
break;
case 8:
*val = tsc2007_xfer(tsc,
(ADC_ON_12BIT | TSC2007_MEASURE_TEMP1));
break;
}
/* Prepare for next touch reading - power down ADC, enable PENIRQ */
tsc2007_xfer(tsc, PWRDOWN);
mutex_unlock(&tsc->mlock);
ret = IIO_VAL_INT;
return ret;
}
static const struct iio_info tsc2007_iio_info = {
.read_raw = tsc2007_read_raw,
};
int tsc2007_iio_configure(struct tsc2007 *ts)
{
struct iio_dev *indio_dev;
struct tsc2007_iio *iio;
int error;
indio_dev = devm_iio_device_alloc(&ts->client->dev, sizeof(*iio));
if (!indio_dev) {
dev_err(&ts->client->dev, "iio_device_alloc failed\n");
return -ENOMEM;
}
iio = iio_priv(indio_dev);
iio->ts = ts;
indio_dev->name = "tsc2007";
indio_dev->dev.parent = &ts->client->dev;
indio_dev->info = &tsc2007_iio_info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = tsc2007_iio_channel;
indio_dev->num_channels = ARRAY_SIZE(tsc2007_iio_channel);
error = devm_iio_device_register(&ts->client->dev, indio_dev);
if (error) {
dev_err(&ts->client->dev,
"iio_device_register() failed: %d\n", error);
return error;
}
return 0;
}
|
