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 
21 static 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 
52 static const struct iio_info iqs620_temp_info = {
53 	.read_raw = &iqs620_temp_read_raw,
54 };
55 
56 static 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 
65 static 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 
85 static struct platform_driver iqs620_temp_platform_driver = {
86 	.driver = {
87 		.name = "iqs620at-temp",
88 	},
89 	.probe = iqs620_temp_probe,
90 };
91 module_platform_driver(iqs620_temp_platform_driver);
92 
93 MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
94 MODULE_DESCRIPTION("Azoteq IQS620AT Temperature Sensor");
95 MODULE_LICENSE("GPL");
96 MODULE_ALIAS("platform:iqs620at-temp");
97