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
iqs620_temp_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)22 static 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
54 static const struct iio_info iqs620_temp_info = {
55 .read_raw = &iqs620_temp_read_raw,
56 };
57
58 static 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
iqs620_temp_probe(struct platform_device * pdev)67 static 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
87 static struct platform_driver iqs620_temp_platform_driver = {
88 .driver = {
89 .name = "iqs620at-temp",
90 },
91 .probe = iqs620_temp_probe,
92 };
93 module_platform_driver(iqs620_temp_platform_driver);
94
95 MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
96 MODULE_DESCRIPTION("Azoteq IQS620AT Temperature Sensor");
97 MODULE_LICENSE("GPL");
98 MODULE_ALIAS("platform:iqs620at-temp");
99