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192.168.1.100 / T103 / 22b96b3d5871e29c5e9512697f9acc487e8c89b8 / . / src / kernel / linux / v4.14 / drivers / iio / temperature / tsys02d.c
blob: c0a19a00038716258a255223fe5709c993e509dc [file] [log] [blame]
rjw1f884582022-01-06 17:20:42 +0800[diff] [blame]1/*
2 * tsys02d.c - Support for Measurement-Specialties tsys02d temperature sensor
3 *
4 * Copyright (c) 2015 Measurement-Specialties
5 *
6 * Licensed under the GPL-2.
7 *
8 * (7-bit I2C slave address 0x40)
9 *
10 * Datasheet:
11 * http://www.meas-spec.com/downloads/Digital_Sensor_TSYS02D.pdf
12 */
13
14#include <linux/init.h>
15#include <linux/device.h>
16#include <linux/kernel.h>
17#include <linux/stat.h>
18#include <linux/module.h>
19#include <linux/iio/iio.h>
20#include <linux/iio/sysfs.h>
21
22#include "../common/ms_sensors/ms_sensors_i2c.h"
23
24#define TSYS02D_RESET 0xFE
25
26static const int tsys02d_samp_freq[4] = { 20, 40, 70, 140 };
27/* String copy of the above const for readability purpose */
28static const char tsys02d_show_samp_freq[] = "20 40 70 140";
29
30static int tsys02d_read_raw(struct iio_dev *indio_dev,
31 struct iio_chan_spec const *channel, int *val,
32 int *val2, long mask)
33{
34 int ret;
35 s32 temperature;
36 struct ms_ht_dev *dev_data = iio_priv(indio_dev);
37
38 switch (mask) {
39 case IIO_CHAN_INFO_PROCESSED:
40 switch (channel->type) {
41 case IIO_TEMP: /* in milli °C */
42 ret = ms_sensors_ht_read_temperature(dev_data,
43 &temperature);
44 if (ret)
45 return ret;
46 *val = temperature;
47
48 return IIO_VAL_INT;
49 default:
50 return -EINVAL;
51 }
52 case IIO_CHAN_INFO_SAMP_FREQ:
53 *val = tsys02d_samp_freq[dev_data->res_index];
54
55 return IIO_VAL_INT;
56 default:
57 return -EINVAL;
58 }
59}
60
61static int tsys02d_write_raw(struct iio_dev *indio_dev,
62 struct iio_chan_spec const *chan,
63 int val, int val2, long mask)
64{
65 struct ms_ht_dev *dev_data = iio_priv(indio_dev);
66 int i, ret;
67
68 switch (mask) {
69 case IIO_CHAN_INFO_SAMP_FREQ:
70 i = ARRAY_SIZE(tsys02d_samp_freq);
71 while (i-- > 0)
72 if (val == tsys02d_samp_freq[i])
73 break;
74 if (i < 0)
75 return -EINVAL;
76 mutex_lock(&dev_data->lock);
77 dev_data->res_index = i;
78 ret = ms_sensors_write_resolution(dev_data, i);
79 mutex_unlock(&dev_data->lock);
80
81 return ret;
82 default:
83 return -EINVAL;
84 }
85}
86
87static const struct iio_chan_spec tsys02d_channels[] = {
88 {
89 .type = IIO_TEMP,
90 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_PROCESSED),
91 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
92 }
93};
94
95static ssize_t tsys02_read_battery_low(struct device *dev,
96 struct device_attribute *attr,
97 char *buf)
98{
99 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
100 struct ms_ht_dev *dev_data = iio_priv(indio_dev);
101
102 return ms_sensors_show_battery_low(dev_data, buf);
103}
104
105static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(tsys02d_show_samp_freq);
106static IIO_DEVICE_ATTR(battery_low, S_IRUGO,
107 tsys02_read_battery_low, NULL, 0);
108
109static struct attribute *tsys02d_attributes[] = {
110 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
111 &iio_dev_attr_battery_low.dev_attr.attr,
112 NULL,
113};
114
115static const struct attribute_group tsys02d_attribute_group = {
116 .attrs = tsys02d_attributes,
117};
118
119static const struct iio_info tsys02d_info = {
120 .read_raw = tsys02d_read_raw,
121 .write_raw = tsys02d_write_raw,
122 .attrs = &tsys02d_attribute_group,
123 .driver_module = THIS_MODULE,
124};
125
126static int tsys02d_probe(struct i2c_client *client,
127 const struct i2c_device_id *id)
128{
129 struct ms_ht_dev *dev_data;
130 struct iio_dev *indio_dev;
131 int ret;
132 u64 serial_number;
133
134 if (!i2c_check_functionality(client->adapter,
135 I2C_FUNC_SMBUS_WRITE_BYTE_DATA |
136 I2C_FUNC_SMBUS_WRITE_BYTE |
137 I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
138 dev_err(&client->dev,
139 "Adapter does not support some i2c transaction\n");
140 return -EOPNOTSUPP;
141 }
142
143 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data));
144 if (!indio_dev)
145 return -ENOMEM;
146
147 dev_data = iio_priv(indio_dev);
148 dev_data->client = client;
149 dev_data->res_index = 0;
150 mutex_init(&dev_data->lock);
151
152 indio_dev->info = &tsys02d_info;
153 indio_dev->name = id->name;
154 indio_dev->dev.parent = &client->dev;
155 indio_dev->modes = INDIO_DIRECT_MODE;
156 indio_dev->channels = tsys02d_channels;
157 indio_dev->num_channels = ARRAY_SIZE(tsys02d_channels);
158
159 i2c_set_clientdata(client, indio_dev);
160
161 ret = ms_sensors_reset(client, TSYS02D_RESET, 15000);
162 if (ret)
163 return ret;
164
165 ret = ms_sensors_read_serial(client, &serial_number);
166 if (ret)
167 return ret;
168 dev_info(&client->dev, "Serial number : %llx", serial_number);
169
170 return devm_iio_device_register(&client->dev, indio_dev);
171}
172
173static const struct i2c_device_id tsys02d_id[] = {
174 {"tsys02d", 0},
175 {}
176};
177MODULE_DEVICE_TABLE(i2c, tsys02d_id);
178
179static struct i2c_driver tsys02d_driver = {
180 .probe = tsys02d_probe,
181 .id_table = tsys02d_id,
182 .driver = {
183 .name = "tsys02d",
184 },
185};
186
187module_i2c_driver(tsys02d_driver);
188
189MODULE_DESCRIPTION("Measurement-Specialties tsys02d temperature driver");
190MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");
191MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>");
192MODULE_LICENSE("GPL v2");