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2b5c53d2 LT |
1 | /* |
2 | * htu21.c - Support for Measurement-Specialties | |
3 | * htu21 temperature & humidity sensor | |
1b75ce65 | 4 | * and humidity part of MS8607 sensor |
2b5c53d2 LT |
5 | * |
6 | * Copyright (c) 2014 Measurement-Specialties | |
7 | * | |
8 | * Licensed under the GPL-2. | |
9 | * | |
10 | * (7-bit I2C slave address 0x40) | |
11 | * | |
12 | * Datasheet: | |
13 | * http://www.meas-spec.com/downloads/HTU21D.pdf | |
1b75ce65 LT |
14 | * Datasheet: |
15 | * http://www.meas-spec.com/downloads/MS8607-02BA01.pdf | |
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16 | */ |
17 | ||
18 | #include <linux/init.h> | |
19 | #include <linux/device.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/stat.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/iio/iio.h> | |
24 | #include <linux/iio/sysfs.h> | |
25 | ||
26 | #include "../common/ms_sensors/ms_sensors_i2c.h" | |
27 | ||
28 | #define HTU21_RESET 0xFE | |
29 | ||
1b75ce65 LT |
30 | enum { |
31 | HTU21, | |
32 | MS8607 | |
33 | }; | |
34 | ||
2b5c53d2 LT |
35 | static const int htu21_samp_freq[4] = { 20, 40, 70, 120 }; |
36 | /* String copy of the above const for readability purpose */ | |
37 | static const char htu21_show_samp_freq[] = "20 40 70 120"; | |
38 | ||
39 | static int htu21_read_raw(struct iio_dev *indio_dev, | |
40 | struct iio_chan_spec const *channel, int *val, | |
41 | int *val2, long mask) | |
42 | { | |
43 | int ret, temperature; | |
44 | unsigned int humidity; | |
45 | struct ms_ht_dev *dev_data = iio_priv(indio_dev); | |
46 | ||
47 | switch (mask) { | |
48 | case IIO_CHAN_INFO_PROCESSED: | |
49 | switch (channel->type) { | |
50 | case IIO_TEMP: /* in milli °C */ | |
51 | ret = ms_sensors_ht_read_temperature(dev_data, | |
52 | &temperature); | |
53 | if (ret) | |
54 | return ret; | |
55 | *val = temperature; | |
56 | ||
57 | return IIO_VAL_INT; | |
58 | case IIO_HUMIDITYRELATIVE: /* in milli %RH */ | |
59 | ret = ms_sensors_ht_read_humidity(dev_data, | |
60 | &humidity); | |
61 | if (ret) | |
62 | return ret; | |
63 | *val = humidity; | |
64 | ||
65 | return IIO_VAL_INT; | |
66 | default: | |
67 | return -EINVAL; | |
68 | } | |
69 | case IIO_CHAN_INFO_SAMP_FREQ: | |
70 | *val = htu21_samp_freq[dev_data->res_index]; | |
71 | ||
72 | return IIO_VAL_INT; | |
73 | default: | |
74 | return -EINVAL; | |
75 | } | |
76 | } | |
77 | ||
78 | static int htu21_write_raw(struct iio_dev *indio_dev, | |
79 | struct iio_chan_spec const *chan, | |
80 | int val, int val2, long mask) | |
81 | { | |
82 | struct ms_ht_dev *dev_data = iio_priv(indio_dev); | |
83 | int i, ret; | |
84 | ||
85 | switch (mask) { | |
86 | case IIO_CHAN_INFO_SAMP_FREQ: | |
87 | i = ARRAY_SIZE(htu21_samp_freq); | |
88 | while (i-- > 0) | |
89 | if (val == htu21_samp_freq[i]) | |
90 | break; | |
91 | if (i < 0) | |
92 | return -EINVAL; | |
93 | mutex_lock(&dev_data->lock); | |
94 | dev_data->res_index = i; | |
95 | ret = ms_sensors_write_resolution(dev_data, i); | |
96 | mutex_unlock(&dev_data->lock); | |
97 | ||
98 | return ret; | |
99 | default: | |
100 | return -EINVAL; | |
101 | } | |
102 | } | |
103 | ||
104 | static const struct iio_chan_spec htu21_channels[] = { | |
105 | { | |
106 | .type = IIO_TEMP, | |
107 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_PROCESSED), | |
108 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), | |
109 | }, | |
110 | { | |
111 | .type = IIO_HUMIDITYRELATIVE, | |
112 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_PROCESSED), | |
113 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), | |
114 | } | |
115 | }; | |
116 | ||
1b75ce65 LT |
117 | /* |
118 | * Meas Spec recommendation is to not read temperature | |
119 | * on this driver part for MS8607 | |
120 | */ | |
121 | static const struct iio_chan_spec ms8607_channels[] = { | |
122 | { | |
123 | .type = IIO_HUMIDITYRELATIVE, | |
124 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_PROCESSED), | |
125 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), | |
126 | } | |
127 | }; | |
128 | ||
2b5c53d2 LT |
129 | static ssize_t htu21_show_battery_low(struct device *dev, |
130 | struct device_attribute *attr, char *buf) | |
131 | { | |
132 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
133 | struct ms_ht_dev *dev_data = iio_priv(indio_dev); | |
134 | ||
135 | return ms_sensors_show_battery_low(dev_data, buf); | |
136 | } | |
137 | ||
138 | static ssize_t htu21_show_heater(struct device *dev, | |
139 | struct device_attribute *attr, char *buf) | |
140 | { | |
141 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
142 | struct ms_ht_dev *dev_data = iio_priv(indio_dev); | |
143 | ||
144 | return ms_sensors_show_heater(dev_data, buf); | |
145 | } | |
146 | ||
147 | static ssize_t htu21_write_heater(struct device *dev, | |
148 | struct device_attribute *attr, | |
149 | const char *buf, size_t len) | |
150 | { | |
151 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
152 | struct ms_ht_dev *dev_data = iio_priv(indio_dev); | |
153 | ||
154 | return ms_sensors_write_heater(dev_data, buf, len); | |
155 | } | |
156 | ||
157 | static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(htu21_show_samp_freq); | |
158 | static IIO_DEVICE_ATTR(battery_low, S_IRUGO, | |
159 | htu21_show_battery_low, NULL, 0); | |
160 | static IIO_DEVICE_ATTR(heater_enable, S_IRUGO | S_IWUSR, | |
161 | htu21_show_heater, htu21_write_heater, 0); | |
162 | ||
163 | static struct attribute *htu21_attributes[] = { | |
164 | &iio_const_attr_sampling_frequency_available.dev_attr.attr, | |
165 | &iio_dev_attr_battery_low.dev_attr.attr, | |
166 | &iio_dev_attr_heater_enable.dev_attr.attr, | |
167 | NULL, | |
168 | }; | |
169 | ||
170 | static const struct attribute_group htu21_attribute_group = { | |
171 | .attrs = htu21_attributes, | |
172 | }; | |
173 | ||
174 | static const struct iio_info htu21_info = { | |
175 | .read_raw = htu21_read_raw, | |
176 | .write_raw = htu21_write_raw, | |
177 | .attrs = &htu21_attribute_group, | |
178 | .driver_module = THIS_MODULE, | |
179 | }; | |
180 | ||
181 | static int htu21_probe(struct i2c_client *client, | |
182 | const struct i2c_device_id *id) | |
183 | { | |
184 | struct ms_ht_dev *dev_data; | |
185 | struct iio_dev *indio_dev; | |
186 | int ret; | |
187 | u64 serial_number; | |
188 | ||
189 | if (!i2c_check_functionality(client->adapter, | |
190 | I2C_FUNC_SMBUS_WRITE_BYTE_DATA | | |
191 | I2C_FUNC_SMBUS_WRITE_BYTE | | |
192 | I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { | |
193 | dev_err(&client->dev, | |
194 | "Adapter does not support some i2c transaction\n"); | |
195 | return -ENODEV; | |
196 | } | |
197 | ||
198 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data)); | |
199 | if (!indio_dev) | |
200 | return -ENOMEM; | |
201 | ||
202 | dev_data = iio_priv(indio_dev); | |
203 | dev_data->client = client; | |
204 | dev_data->res_index = 0; | |
205 | mutex_init(&dev_data->lock); | |
206 | ||
207 | indio_dev->info = &htu21_info; | |
208 | indio_dev->name = id->name; | |
209 | indio_dev->dev.parent = &client->dev; | |
210 | indio_dev->modes = INDIO_DIRECT_MODE; | |
1b75ce65 LT |
211 | |
212 | if (id->driver_data == MS8607) { | |
213 | indio_dev->channels = ms8607_channels; | |
214 | indio_dev->num_channels = ARRAY_SIZE(ms8607_channels); | |
215 | } else { | |
216 | indio_dev->channels = htu21_channels; | |
217 | indio_dev->num_channels = ARRAY_SIZE(htu21_channels); | |
218 | } | |
2b5c53d2 LT |
219 | |
220 | i2c_set_clientdata(client, indio_dev); | |
221 | ||
222 | ret = ms_sensors_reset(client, HTU21_RESET, 15000); | |
223 | if (ret) | |
224 | return ret; | |
225 | ||
226 | ret = ms_sensors_read_serial(client, &serial_number); | |
227 | if (ret) | |
228 | return ret; | |
229 | dev_info(&client->dev, "Serial number : %llx", serial_number); | |
230 | ||
231 | return devm_iio_device_register(&client->dev, indio_dev); | |
232 | } | |
233 | ||
234 | static const struct i2c_device_id htu21_id[] = { | |
1b75ce65 LT |
235 | {"htu21", HTU21}, |
236 | {"ms8607-humidity", MS8607}, | |
2b5c53d2 LT |
237 | {} |
238 | }; | |
239 | ||
240 | static struct i2c_driver htu21_driver = { | |
241 | .probe = htu21_probe, | |
242 | .id_table = htu21_id, | |
243 | .driver = { | |
244 | .name = "htu21", | |
245 | }, | |
246 | }; | |
247 | ||
248 | module_i2c_driver(htu21_driver); | |
249 | ||
250 | MODULE_DESCRIPTION("Measurement-Specialties htu21 temperature and humidity driver"); | |
251 | MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>"); | |
252 | MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>"); | |
253 | MODULE_LICENSE("GPL v2"); |