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80503b23 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
4f3a6595 JC |
2 | /* |
3 | * AD7314 digital temperature sensor driver for AD7314, ADT7301 and ADT7302 | |
4 | * | |
5 | * Copyright 2010 Analog Devices Inc. | |
6 | * | |
4f3a6595 JC |
7 | * Conversion to hwmon from IIO done by Jonathan Cameron <jic23@cam.ac.uk> |
8 | */ | |
9 | #include <linux/device.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/sysfs.h> | |
13 | #include <linux/spi/spi.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/err.h> | |
16 | #include <linux/hwmon.h> | |
17 | #include <linux/hwmon-sysfs.h> | |
984faa1f | 18 | #include <linux/bitops.h> |
4f3a6595 | 19 | |
4f3a6595 JC |
20 | /* |
21 | * AD7314 temperature masks | |
22 | */ | |
4f3a6595 | 23 | #define AD7314_TEMP_MASK 0x7FE0 |
1137a9a6 | 24 | #define AD7314_TEMP_SHIFT 5 |
4f3a6595 JC |
25 | |
26 | /* | |
27 | * ADT7301 and ADT7302 temperature masks | |
28 | */ | |
4f3a6595 JC |
29 | #define ADT7301_TEMP_MASK 0x3FFF |
30 | ||
31 | enum ad7314_variant { | |
32 | adt7301, | |
33 | adt7302, | |
34 | ad7314, | |
35 | }; | |
36 | ||
37 | struct ad7314_data { | |
38 | struct spi_device *spi_dev; | |
4f3a6595 JC |
39 | u16 rx ____cacheline_aligned; |
40 | }; | |
41 | ||
eae1415d | 42 | static int ad7314_spi_read(struct ad7314_data *chip) |
4f3a6595 JC |
43 | { |
44 | int ret; | |
45 | ||
46 | ret = spi_read(chip->spi_dev, (u8 *)&chip->rx, sizeof(chip->rx)); | |
47 | if (ret < 0) { | |
48 | dev_err(&chip->spi_dev->dev, "SPI read error\n"); | |
49 | return ret; | |
50 | } | |
51 | ||
eae1415d | 52 | return be16_to_cpu(chip->rx); |
4f3a6595 JC |
53 | } |
54 | ||
1ba3e023 GR |
55 | static ssize_t ad7314_temperature_show(struct device *dev, |
56 | struct device_attribute *attr, | |
57 | char *buf) | |
4f3a6595 JC |
58 | { |
59 | struct ad7314_data *chip = dev_get_drvdata(dev); | |
60 | s16 data; | |
61 | int ret; | |
62 | ||
eae1415d | 63 | ret = ad7314_spi_read(chip); |
4f3a6595 JC |
64 | if (ret < 0) |
65 | return ret; | |
66 | switch (spi_get_device_id(chip->spi_dev)->driver_data) { | |
67 | case ad7314: | |
1137a9a6 | 68 | data = (ret & AD7314_TEMP_MASK) >> AD7314_TEMP_SHIFT; |
984faa1f | 69 | data = sign_extend32(data, 9); |
4f3a6595 JC |
70 | |
71 | return sprintf(buf, "%d\n", 250 * data); | |
72 | case adt7301: | |
73 | case adt7302: | |
74 | /* | |
75 | * Documented as a 13 bit twos complement register | |
76 | * with a sign bit - which is a 14 bit 2's complement | |
77 | * register. 1lsb - 31.25 milli degrees centigrade | |
78 | */ | |
eae1415d | 79 | data = ret & ADT7301_TEMP_MASK; |
984faa1f | 80 | data = sign_extend32(data, 13); |
4f3a6595 JC |
81 | |
82 | return sprintf(buf, "%d\n", | |
83 | DIV_ROUND_CLOSEST(data * 3125, 100)); | |
84 | default: | |
85 | return -EINVAL; | |
86 | } | |
87 | } | |
88 | ||
1ba3e023 | 89 | static SENSOR_DEVICE_ATTR_RO(temp1_input, ad7314_temperature, 0); |
4f3a6595 | 90 | |
157926c0 | 91 | static struct attribute *ad7314_attrs[] = { |
4f3a6595 JC |
92 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
93 | NULL, | |
94 | }; | |
95 | ||
157926c0 | 96 | ATTRIBUTE_GROUPS(ad7314); |
4f3a6595 | 97 | |
6c931ae1 | 98 | static int ad7314_probe(struct spi_device *spi_dev) |
4f3a6595 | 99 | { |
4f3a6595 | 100 | struct ad7314_data *chip; |
157926c0 | 101 | struct device *hwmon_dev; |
4f3a6595 | 102 | |
be923040 GR |
103 | chip = devm_kzalloc(&spi_dev->dev, sizeof(*chip), GFP_KERNEL); |
104 | if (chip == NULL) | |
105 | return -ENOMEM; | |
106 | ||
e16de913 | 107 | chip->spi_dev = spi_dev; |
157926c0 AL |
108 | hwmon_dev = devm_hwmon_device_register_with_groups(&spi_dev->dev, |
109 | spi_dev->modalias, | |
110 | chip, ad7314_groups); | |
111 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
4f3a6595 JC |
112 | } |
113 | ||
114 | static const struct spi_device_id ad7314_id[] = { | |
115 | { "adt7301", adt7301 }, | |
116 | { "adt7302", adt7302 }, | |
117 | { "ad7314", ad7314 }, | |
118 | { } | |
119 | }; | |
120 | MODULE_DEVICE_TABLE(spi, ad7314_id); | |
121 | ||
122 | static struct spi_driver ad7314_driver = { | |
123 | .driver = { | |
124 | .name = "ad7314", | |
4f3a6595 JC |
125 | }, |
126 | .probe = ad7314_probe, | |
4f3a6595 JC |
127 | .id_table = ad7314_id, |
128 | }; | |
129 | ||
91efffe2 | 130 | module_spi_driver(ad7314_driver); |
4f3a6595 JC |
131 | |
132 | MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>"); | |
b55f3757 | 133 | MODULE_DESCRIPTION("Analog Devices AD7314, ADT7301 and ADT7302 digital temperature sensor driver"); |
4f3a6595 | 134 | MODULE_LICENSE("GPL v2"); |