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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * AD7314 digital temperature sensor driver for AD7314, ADT7301 and ADT7302
4 *
5 * Copyright 2010 Analog Devices Inc.
6 *
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>
18#include <linux/bitops.h>
19
20/*
21 * AD7314 temperature masks
22 */
23#define AD7314_TEMP_MASK 0x7FE0
24#define AD7314_TEMP_SHIFT 5
25
26/*
27 * ADT7301 and ADT7302 temperature masks
28 */
29#define ADT7301_TEMP_MASK 0x3FFF
30
31enum ad7314_variant {
32 adt7301,
33 adt7302,
34 ad7314,
35};
36
37struct ad7314_data {
38 struct spi_device *spi_dev;
39 u16 rx ____cacheline_aligned;
40};
41
42static int ad7314_spi_read(struct ad7314_data *chip)
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
52 return be16_to_cpu(chip->rx);
53}
54
55static ssize_t ad7314_temperature_show(struct device *dev,
56 struct device_attribute *attr,
57 char *buf)
58{
59 struct ad7314_data *chip = dev_get_drvdata(dev);
60 s16 data;
61 int ret;
62
63 ret = ad7314_spi_read(chip);
64 if (ret < 0)
65 return ret;
66 switch (spi_get_device_id(chip->spi_dev)->driver_data) {
67 case ad7314:
68 data = (ret & AD7314_TEMP_MASK) >> AD7314_TEMP_SHIFT;
69 data = sign_extend32(data, 9);
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 */
79 data = ret & ADT7301_TEMP_MASK;
80 data = sign_extend32(data, 13);
81
82 return sprintf(buf, "%d\n",
83 DIV_ROUND_CLOSEST(data * 3125, 100));
84 default:
85 return -EINVAL;
86 }
87}
88
89static SENSOR_DEVICE_ATTR_RO(temp1_input, ad7314_temperature, 0);
90
91static struct attribute *ad7314_attrs[] = {
92 &sensor_dev_attr_temp1_input.dev_attr.attr,
93 NULL,
94};
95
96ATTRIBUTE_GROUPS(ad7314);
97
98static int ad7314_probe(struct spi_device *spi_dev)
99{
100 struct ad7314_data *chip;
101 struct device *hwmon_dev;
102
103 chip = devm_kzalloc(&spi_dev->dev, sizeof(*chip), GFP_KERNEL);
104 if (chip == NULL)
105 return -ENOMEM;
106
107 chip->spi_dev = spi_dev;
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);
112}
113
114static const struct spi_device_id ad7314_id[] = {
115 { "adt7301", adt7301 },
116 { "adt7302", adt7302 },
117 { "ad7314", ad7314 },
118 { }
119};
120MODULE_DEVICE_TABLE(spi, ad7314_id);
121
122static struct spi_driver ad7314_driver = {
123 .driver = {
124 .name = "ad7314",
125 },
126 .probe = ad7314_probe,
127 .id_table = ad7314_id,
128};
129
130module_spi_driver(ad7314_driver);
131
132MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
133MODULE_DESCRIPTION("Analog Devices AD7314, ADT7301 and ADT7302 digital temperature sensor driver");
134MODULE_LICENSE("GPL v2");
1/*
2 * AD7314 digital temperature sensor driver for AD7314, ADT7301 and ADT7302
3 *
4 * Copyright 2010 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2 or later.
7 *
8 * Conversion to hwmon from IIO done by Jonathan Cameron <jic23@cam.ac.uk>
9 */
10#include <linux/device.h>
11#include <linux/kernel.h>
12#include <linux/slab.h>
13#include <linux/sysfs.h>
14#include <linux/spi/spi.h>
15#include <linux/module.h>
16#include <linux/err.h>
17#include <linux/hwmon.h>
18#include <linux/hwmon-sysfs.h>
19#include <linux/bitops.h>
20
21/*
22 * AD7314 temperature masks
23 */
24#define AD7314_TEMP_MASK 0x7FE0
25#define AD7314_TEMP_SHIFT 5
26
27/*
28 * ADT7301 and ADT7302 temperature masks
29 */
30#define ADT7301_TEMP_MASK 0x3FFF
31
32enum ad7314_variant {
33 adt7301,
34 adt7302,
35 ad7314,
36};
37
38struct ad7314_data {
39 struct spi_device *spi_dev;
40 struct device *hwmon_dev;
41 u16 rx ____cacheline_aligned;
42};
43
44static int ad7314_spi_read(struct ad7314_data *chip)
45{
46 int ret;
47
48 ret = spi_read(chip->spi_dev, (u8 *)&chip->rx, sizeof(chip->rx));
49 if (ret < 0) {
50 dev_err(&chip->spi_dev->dev, "SPI read error\n");
51 return ret;
52 }
53
54 return be16_to_cpu(chip->rx);
55}
56
57static ssize_t ad7314_show_temperature(struct device *dev,
58 struct device_attribute *attr,
59 char *buf)
60{
61 struct ad7314_data *chip = dev_get_drvdata(dev);
62 s16 data;
63 int ret;
64
65 ret = ad7314_spi_read(chip);
66 if (ret < 0)
67 return ret;
68 switch (spi_get_device_id(chip->spi_dev)->driver_data) {
69 case ad7314:
70 data = (ret & AD7314_TEMP_MASK) >> AD7314_TEMP_SHIFT;
71 data = sign_extend32(data, 9);
72
73 return sprintf(buf, "%d\n", 250 * data);
74 case adt7301:
75 case adt7302:
76 /*
77 * Documented as a 13 bit twos complement register
78 * with a sign bit - which is a 14 bit 2's complement
79 * register. 1lsb - 31.25 milli degrees centigrade
80 */
81 data = ret & ADT7301_TEMP_MASK;
82 data = sign_extend32(data, 13);
83
84 return sprintf(buf, "%d\n",
85 DIV_ROUND_CLOSEST(data * 3125, 100));
86 default:
87 return -EINVAL;
88 }
89}
90
91static ssize_t ad7314_show_name(struct device *dev,
92 struct device_attribute *devattr, char *buf)
93{
94 return sprintf(buf, "%s\n", to_spi_device(dev)->modalias);
95}
96
97static DEVICE_ATTR(name, S_IRUGO, ad7314_show_name, NULL);
98static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
99 ad7314_show_temperature, NULL, 0);
100
101static struct attribute *ad7314_attributes[] = {
102 &dev_attr_name.attr,
103 &sensor_dev_attr_temp1_input.dev_attr.attr,
104 NULL,
105};
106
107static const struct attribute_group ad7314_group = {
108 .attrs = ad7314_attributes,
109};
110
111static int ad7314_probe(struct spi_device *spi_dev)
112{
113 int ret;
114 struct ad7314_data *chip;
115
116 chip = devm_kzalloc(&spi_dev->dev, sizeof(*chip), GFP_KERNEL);
117 if (chip == NULL)
118 return -ENOMEM;
119
120 spi_set_drvdata(spi_dev, chip);
121
122 ret = sysfs_create_group(&spi_dev->dev.kobj, &ad7314_group);
123 if (ret < 0)
124 return ret;
125
126 chip->hwmon_dev = hwmon_device_register(&spi_dev->dev);
127 if (IS_ERR(chip->hwmon_dev)) {
128 ret = PTR_ERR(chip->hwmon_dev);
129 goto error_remove_group;
130 }
131 chip->spi_dev = spi_dev;
132
133 return 0;
134error_remove_group:
135 sysfs_remove_group(&spi_dev->dev.kobj, &ad7314_group);
136 return ret;
137}
138
139static int ad7314_remove(struct spi_device *spi_dev)
140{
141 struct ad7314_data *chip = spi_get_drvdata(spi_dev);
142
143 hwmon_device_unregister(chip->hwmon_dev);
144 sysfs_remove_group(&spi_dev->dev.kobj, &ad7314_group);
145
146 return 0;
147}
148
149static const struct spi_device_id ad7314_id[] = {
150 { "adt7301", adt7301 },
151 { "adt7302", adt7302 },
152 { "ad7314", ad7314 },
153 { }
154};
155MODULE_DEVICE_TABLE(spi, ad7314_id);
156
157static struct spi_driver ad7314_driver = {
158 .driver = {
159 .name = "ad7314",
160 },
161 .probe = ad7314_probe,
162 .remove = ad7314_remove,
163 .id_table = ad7314_id,
164};
165
166module_spi_driver(ad7314_driver);
167
168MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
169MODULE_DESCRIPTION("Analog Devices AD7314, ADT7301 and ADT7302 digital temperature sensor driver");
170MODULE_LICENSE("GPL v2");