1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * tsys02d.c - Support for Measurement-Specialties tsys02d temperature sensor |
4 | * |
5 | * Copyright (c) 2015 Measurement-Specialties |
6 | * |
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: &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(lock: &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, |
122 | }; |
123 | |
124 | static int tsys02d_probe(struct i2c_client *client) |
125 | { |
126 | const struct i2c_device_id *id = i2c_client_get_device_id(client); |
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(adap: 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" ); |
138 | return -EOPNOTSUPP; |
139 | } |
140 | |
141 | indio_dev = devm_iio_device_alloc(parent: &client->dev, sizeof_priv: 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; |
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, data: indio_dev); |
157 | |
158 | ret = ms_sensors_reset(cli: client, TSYS02D_RESET, delay: 15000); |
159 | if (ret) |
160 | return ret; |
161 | |
162 | ret = ms_sensors_read_serial(client, sn: &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[] = { |
171 | {"tsys02d" , 0}, |
172 | {} |
173 | }; |
174 | MODULE_DEVICE_TABLE(i2c, tsys02d_id); |
175 | |
176 | static struct i2c_driver tsys02d_driver = { |
177 | .probe = tsys02d_probe, |
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" ); |
190 | MODULE_IMPORT_NS(IIO_MEAS_SPEC_SENSORS); |
191 | |