1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0+
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Azoteq IQS620AT Temperature Sensor
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2019 Jeff LaBundy <jeff@labundy.com>
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/device.h>
9*4882a593Smuzhiyun #include <linux/iio/iio.h>
10*4882a593Smuzhiyun #include <linux/kernel.h>
11*4882a593Smuzhiyun #include <linux/mfd/iqs62x.h>
12*4882a593Smuzhiyun #include <linux/module.h>
13*4882a593Smuzhiyun #include <linux/platform_device.h>
14*4882a593Smuzhiyun #include <linux/regmap.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #define IQS620_TEMP_UI_OUT 0x1A
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #define IQS620_TEMP_SCALE 1000
19*4882a593Smuzhiyun #define IQS620_TEMP_OFFSET (-100)
20*4882a593Smuzhiyun
iqs620_temp_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)21*4882a593Smuzhiyun static int iqs620_temp_read_raw(struct iio_dev *indio_dev,
22*4882a593Smuzhiyun struct iio_chan_spec const *chan,
23*4882a593Smuzhiyun int *val, int *val2, long mask)
24*4882a593Smuzhiyun {
25*4882a593Smuzhiyun struct iqs62x_core *iqs62x = iio_device_get_drvdata(indio_dev);
26*4882a593Smuzhiyun int ret;
27*4882a593Smuzhiyun __le16 val_buf;
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun switch (mask) {
30*4882a593Smuzhiyun case IIO_CHAN_INFO_RAW:
31*4882a593Smuzhiyun ret = regmap_raw_read(iqs62x->regmap, IQS620_TEMP_UI_OUT,
32*4882a593Smuzhiyun &val_buf, sizeof(val_buf));
33*4882a593Smuzhiyun if (ret)
34*4882a593Smuzhiyun return ret;
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun *val = le16_to_cpu(val_buf);
37*4882a593Smuzhiyun return IIO_VAL_INT;
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun case IIO_CHAN_INFO_SCALE:
40*4882a593Smuzhiyun *val = IQS620_TEMP_SCALE;
41*4882a593Smuzhiyun return IIO_VAL_INT;
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun case IIO_CHAN_INFO_OFFSET:
44*4882a593Smuzhiyun *val = IQS620_TEMP_OFFSET;
45*4882a593Smuzhiyun return IIO_VAL_INT;
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun default:
48*4882a593Smuzhiyun return -EINVAL;
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun static const struct iio_info iqs620_temp_info = {
53*4882a593Smuzhiyun .read_raw = &iqs620_temp_read_raw,
54*4882a593Smuzhiyun };
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun static const struct iio_chan_spec iqs620_temp_channels[] = {
57*4882a593Smuzhiyun {
58*4882a593Smuzhiyun .type = IIO_TEMP,
59*4882a593Smuzhiyun .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
60*4882a593Smuzhiyun BIT(IIO_CHAN_INFO_SCALE) |
61*4882a593Smuzhiyun BIT(IIO_CHAN_INFO_OFFSET),
62*4882a593Smuzhiyun },
63*4882a593Smuzhiyun };
64*4882a593Smuzhiyun
iqs620_temp_probe(struct platform_device * pdev)65*4882a593Smuzhiyun static int iqs620_temp_probe(struct platform_device *pdev)
66*4882a593Smuzhiyun {
67*4882a593Smuzhiyun struct iqs62x_core *iqs62x = dev_get_drvdata(pdev->dev.parent);
68*4882a593Smuzhiyun struct iio_dev *indio_dev;
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun indio_dev = devm_iio_device_alloc(&pdev->dev, 0);
71*4882a593Smuzhiyun if (!indio_dev)
72*4882a593Smuzhiyun return -ENOMEM;
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun iio_device_set_drvdata(indio_dev, iqs62x);
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun indio_dev->modes = INDIO_DIRECT_MODE;
77*4882a593Smuzhiyun indio_dev->channels = iqs620_temp_channels;
78*4882a593Smuzhiyun indio_dev->num_channels = ARRAY_SIZE(iqs620_temp_channels);
79*4882a593Smuzhiyun indio_dev->name = iqs62x->dev_desc->dev_name;
80*4882a593Smuzhiyun indio_dev->info = &iqs620_temp_info;
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun return devm_iio_device_register(&pdev->dev, indio_dev);
83*4882a593Smuzhiyun }
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun static struct platform_driver iqs620_temp_platform_driver = {
86*4882a593Smuzhiyun .driver = {
87*4882a593Smuzhiyun .name = "iqs620at-temp",
88*4882a593Smuzhiyun },
89*4882a593Smuzhiyun .probe = iqs620_temp_probe,
90*4882a593Smuzhiyun };
91*4882a593Smuzhiyun module_platform_driver(iqs620_temp_platform_driver);
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
94*4882a593Smuzhiyun MODULE_DESCRIPTION("Azoteq IQS620AT Temperature Sensor");
95*4882a593Smuzhiyun MODULE_LICENSE("GPL");
96*4882a593Smuzhiyun MODULE_ALIAS("platform:iqs620at-temp");
97