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