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#define IQS620_TEMP_OFFSET_V3			(-40)
21
22static int iqs620_temp_read_raw(struct iio_dev *indio_dev,
23				struct iio_chan_spec const *chan,
24				int *val, int *val2, long mask)
25{
26	struct iqs62x_core *iqs62x = iio_device_get_drvdata(indio_dev);
27	int ret;
28	__le16 val_buf;
29
30	switch (mask) {
31	case IIO_CHAN_INFO_RAW:
32		ret = regmap_raw_read(iqs62x->regmap, IQS620_TEMP_UI_OUT,
33				      &val_buf, sizeof(val_buf));
34		if (ret)
35			return ret;
36
37		*val = le16_to_cpu(val_buf);
38		return IIO_VAL_INT;
39
40	case IIO_CHAN_INFO_SCALE:
41		*val = IQS620_TEMP_SCALE;
42		return IIO_VAL_INT;
43
44	case IIO_CHAN_INFO_OFFSET:
45		*val = iqs62x->hw_num < IQS620_HW_NUM_V3 ? IQS620_TEMP_OFFSET
46							 : IQS620_TEMP_OFFSET_V3;
47		return IIO_VAL_INT;
48
49	default:
50		return -EINVAL;
51	}
52}
53
54static const struct iio_info iqs620_temp_info = {
55	.read_raw = &iqs620_temp_read_raw,
56};
57
58static const struct iio_chan_spec iqs620_temp_channels[] = {
59	{
60		.type = IIO_TEMP,
61		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
62				      BIT(IIO_CHAN_INFO_SCALE) |
63				      BIT(IIO_CHAN_INFO_OFFSET),
64	},
65};
66
67static int iqs620_temp_probe(struct platform_device *pdev)
68{
69	struct iqs62x_core *iqs62x = dev_get_drvdata(pdev->dev.parent);
70	struct iio_dev *indio_dev;
71
72	indio_dev = devm_iio_device_alloc(&pdev->dev, 0);
73	if (!indio_dev)
74		return -ENOMEM;
75
76	iio_device_set_drvdata(indio_dev, iqs62x);
77
78	indio_dev->modes = INDIO_DIRECT_MODE;
79	indio_dev->channels = iqs620_temp_channels;
80	indio_dev->num_channels = ARRAY_SIZE(iqs620_temp_channels);
81	indio_dev->name = iqs62x->dev_desc->dev_name;
82	indio_dev->info = &iqs620_temp_info;
83
84	return devm_iio_device_register(&pdev->dev, indio_dev);
85}
86
87static struct platform_driver iqs620_temp_platform_driver = {
88	.driver = {
89		.name = "iqs620at-temp",
90	},
91	.probe = iqs620_temp_probe,
92};
93module_platform_driver(iqs620_temp_platform_driver);
94
95MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
96MODULE_DESCRIPTION("Azoteq IQS620AT Temperature Sensor");
97MODULE_LICENSE("GPL");
98MODULE_ALIAS("platform:iqs620at-temp");
99