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
iqs620_temp_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)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
iqs620_temp_probe(struct platform_device * pdev)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
