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fda8d26e | 1 | // SPDX-License-Identifier: GPL-2.0-only |
53bf4d06 LT |
2 | /* |
3 | * tsys02d.c - Support for Measurement-Specialties tsys02d temperature sensor | |
4 | * | |
5 | * Copyright (c) 2015 Measurement-Specialties | |
6 | * | |
53bf4d06 LT |
7 | * (7-bit I2C slave address 0x40) |
8 | * | |
9 | * Datasheet: | |
10 | * http://www.meas-spec.com/downloads/Digital_Sensor_TSYS02D.pdf | |
11 | */ | |
12 | ||
13 | #include <linux/init.h> | |
14 | #include <linux/device.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/stat.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/iio/iio.h> | |
19 | #include <linux/iio/sysfs.h> | |
20 | ||
21 | #include "../common/ms_sensors/ms_sensors_i2c.h" | |
22 | ||
23 | #define TSYS02D_RESET 0xFE | |
24 | ||
25 | static const int tsys02d_samp_freq[4] = { 20, 40, 70, 140 }; | |
26 | /* String copy of the above const for readability purpose */ | |
27 | static const char tsys02d_show_samp_freq[] = "20 40 70 140"; | |
28 | ||
29 | static int tsys02d_read_raw(struct iio_dev *indio_dev, | |
30 | struct iio_chan_spec const *channel, int *val, | |
31 | int *val2, long mask) | |
32 | { | |
33 | int ret; | |
34 | s32 temperature; | |
35 | struct ms_ht_dev *dev_data = iio_priv(indio_dev); | |
36 | ||
37 | switch (mask) { | |
38 | case IIO_CHAN_INFO_PROCESSED: | |
39 | switch (channel->type) { | |
40 | case IIO_TEMP: /* in milli °C */ | |
41 | ret = ms_sensors_ht_read_temperature(dev_data, | |
42 | &temperature); | |
43 | if (ret) | |
44 | return ret; | |
45 | *val = temperature; | |
46 | ||
47 | return IIO_VAL_INT; | |
48 | default: | |
49 | return -EINVAL; | |
50 | } | |
51 | case IIO_CHAN_INFO_SAMP_FREQ: | |
52 | *val = tsys02d_samp_freq[dev_data->res_index]; | |
53 | ||
54 | return IIO_VAL_INT; | |
55 | default: | |
56 | return -EINVAL; | |
57 | } | |
58 | } | |
59 | ||
60 | static int tsys02d_write_raw(struct iio_dev *indio_dev, | |
61 | struct iio_chan_spec const *chan, | |
62 | int val, int val2, long mask) | |
63 | { | |
64 | struct ms_ht_dev *dev_data = iio_priv(indio_dev); | |
65 | int i, ret; | |
66 | ||
67 | switch (mask) { | |
68 | case IIO_CHAN_INFO_SAMP_FREQ: | |
69 | i = ARRAY_SIZE(tsys02d_samp_freq); | |
70 | while (i-- > 0) | |
71 | if (val == tsys02d_samp_freq[i]) | |
72 | break; | |
73 | if (i < 0) | |
74 | return -EINVAL; | |
75 | mutex_lock(&dev_data->lock); | |
76 | dev_data->res_index = i; | |
77 | ret = ms_sensors_write_resolution(dev_data, i); | |
78 | mutex_unlock(&dev_data->lock); | |
79 | ||
80 | return ret; | |
81 | default: | |
82 | return -EINVAL; | |
83 | } | |
84 | } | |
85 | ||
86 | static const struct iio_chan_spec tsys02d_channels[] = { | |
87 | { | |
88 | .type = IIO_TEMP, | |
89 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_PROCESSED), | |
90 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), | |
91 | } | |
92 | }; | |
93 | ||
94 | static ssize_t tsys02_read_battery_low(struct device *dev, | |
95 | struct device_attribute *attr, | |
96 | char *buf) | |
97 | { | |
98 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
99 | struct ms_ht_dev *dev_data = iio_priv(indio_dev); | |
100 | ||
101 | return ms_sensors_show_battery_low(dev_data, buf); | |
102 | } | |
103 | ||
104 | static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(tsys02d_show_samp_freq); | |
105 | static IIO_DEVICE_ATTR(battery_low, S_IRUGO, | |
106 | tsys02_read_battery_low, NULL, 0); | |
107 | ||
108 | static struct attribute *tsys02d_attributes[] = { | |
109 | &iio_const_attr_sampling_frequency_available.dev_attr.attr, | |
110 | &iio_dev_attr_battery_low.dev_attr.attr, | |
111 | NULL, | |
112 | }; | |
113 | ||
114 | static const struct attribute_group tsys02d_attribute_group = { | |
115 | .attrs = tsys02d_attributes, | |
116 | }; | |
117 | ||
118 | static const struct iio_info tsys02d_info = { | |
119 | .read_raw = tsys02d_read_raw, | |
120 | .write_raw = tsys02d_write_raw, | |
121 | .attrs = &tsys02d_attribute_group, | |
53bf4d06 LT |
122 | }; |
123 | ||
6a911319 | 124 | static int tsys02d_probe(struct i2c_client *client) |
53bf4d06 | 125 | { |
6a911319 | 126 | const struct i2c_device_id *id = i2c_client_get_device_id(client); |
53bf4d06 LT |
127 | struct ms_ht_dev *dev_data; |
128 | struct iio_dev *indio_dev; | |
129 | int ret; | |
130 | u64 serial_number; | |
131 | ||
132 | if (!i2c_check_functionality(client->adapter, | |
133 | I2C_FUNC_SMBUS_WRITE_BYTE_DATA | | |
134 | I2C_FUNC_SMBUS_WRITE_BYTE | | |
135 | I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { | |
136 | dev_err(&client->dev, | |
137 | "Adapter does not support some i2c transaction\n"); | |
f8d9d3b4 | 138 | return -EOPNOTSUPP; |
53bf4d06 LT |
139 | } |
140 | ||
141 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data)); | |
142 | if (!indio_dev) | |
143 | return -ENOMEM; | |
144 | ||
145 | dev_data = iio_priv(indio_dev); | |
146 | dev_data->client = client; | |
147 | dev_data->res_index = 0; | |
148 | mutex_init(&dev_data->lock); | |
149 | ||
150 | indio_dev->info = &tsys02d_info; | |
151 | indio_dev->name = id->name; | |
53bf4d06 LT |
152 | indio_dev->modes = INDIO_DIRECT_MODE; |
153 | indio_dev->channels = tsys02d_channels; | |
154 | indio_dev->num_channels = ARRAY_SIZE(tsys02d_channels); | |
155 | ||
156 | i2c_set_clientdata(client, indio_dev); | |
157 | ||
158 | ret = ms_sensors_reset(client, TSYS02D_RESET, 15000); | |
159 | if (ret) | |
160 | return ret; | |
161 | ||
162 | ret = ms_sensors_read_serial(client, &serial_number); | |
163 | if (ret) | |
164 | return ret; | |
165 | dev_info(&client->dev, "Serial number : %llx", serial_number); | |
166 | ||
167 | return devm_iio_device_register(&client->dev, indio_dev); | |
168 | } | |
169 | ||
170 | static const struct i2c_device_id tsys02d_id[] = { | |
4391affa | 171 | { "tsys02d" }, |
53bf4d06 LT |
172 | {} |
173 | }; | |
cdd469ad | 174 | MODULE_DEVICE_TABLE(i2c, tsys02d_id); |
53bf4d06 LT |
175 | |
176 | static struct i2c_driver tsys02d_driver = { | |
7cf15f42 | 177 | .probe = tsys02d_probe, |
53bf4d06 LT |
178 | .id_table = tsys02d_id, |
179 | .driver = { | |
180 | .name = "tsys02d", | |
181 | }, | |
182 | }; | |
183 | ||
184 | module_i2c_driver(tsys02d_driver); | |
185 | ||
186 | MODULE_DESCRIPTION("Measurement-Specialties tsys02d temperature driver"); | |
187 | MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>"); | |
188 | MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>"); | |
189 | MODULE_LICENSE("GPL v2"); | |
a7f6cecf | 190 | MODULE_IMPORT_NS(IIO_MEAS_SPEC_SENSORS); |