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 | |
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(map: iqs62x->regmap, IQS620_TEMP_UI_OUT, |
33 | val: &val_buf, val_len: 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 | |
67 | static int iqs620_temp_probe(struct platform_device *pdev) |
68 | { |
69 | struct iqs62x_core *iqs62x = dev_get_drvdata(dev: pdev->dev.parent); |
70 | struct iio_dev *indio_dev; |
71 | |
72 | indio_dev = devm_iio_device_alloc(parent: &pdev->dev, sizeof_priv: 0); |
73 | if (!indio_dev) |
74 | return -ENOMEM; |
75 | |
76 | iio_device_set_drvdata(indio_dev, data: 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 | |