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13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/i2c.h>
16#include <linux/bitops.h>
17
18#include <linux/iio/iio.h>
19#include <linux/iio/sysfs.h>
20
21#define HDC2010_REG_TEMP_LOW 0x00
22#define HDC2010_REG_TEMP_HIGH 0x01
23#define HDC2010_REG_HUMIDITY_LOW 0x02
24#define HDC2010_REG_HUMIDITY_HIGH 0x03
25#define HDC2010_REG_INTERRUPT_DRDY 0x04
26#define HDC2010_REG_TEMP_MAX 0x05
27#define HDC2010_REG_HUMIDITY_MAX 0x06
28#define HDC2010_REG_INTERRUPT_EN 0x07
29#define HDC2010_REG_TEMP_OFFSET_ADJ 0x08
30#define HDC2010_REG_HUMIDITY_OFFSET_ADJ 0x09
31#define HDC2010_REG_TEMP_THR_L 0x0a
32#define HDC2010_REG_TEMP_THR_H 0x0b
33#define HDC2010_REG_RH_THR_L 0x0c
34#define HDC2010_REG_RH_THR_H 0x0d
35#define HDC2010_REG_RESET_DRDY_INT_CONF 0x0e
36#define HDC2010_REG_MEASUREMENT_CONF 0x0f
37
38#define HDC2010_MEAS_CONF GENMASK(2, 1)
39#define HDC2010_MEAS_TRIG BIT(0)
40#define HDC2010_HEATER_EN BIT(3)
41#define HDC2010_AMM GENMASK(6, 4)
42
43struct hdc2010_data {
44 struct i2c_client *client;
45 struct mutex lock;
46 u8 measurement_config;
47 u8 interrupt_config;
48 u8 drdy_config;
49};
50
51enum hdc2010_addr_groups {
52 HDC2010_GROUP_TEMP = 0,
53 HDC2010_GROUP_HUMIDITY,
54};
55
56struct hdc2010_reg_record {
57 unsigned long primary;
58 unsigned long peak;
59};
60
61static const struct hdc2010_reg_record hdc2010_reg_translation[] = {
62 [HDC2010_GROUP_TEMP] = {
63 .primary = HDC2010_REG_TEMP_LOW,
64 .peak = HDC2010_REG_TEMP_MAX,
65 },
66 [HDC2010_GROUP_HUMIDITY] = {
67 .primary = HDC2010_REG_HUMIDITY_LOW,
68 .peak = HDC2010_REG_HUMIDITY_MAX,
69 },
70};
71
72static IIO_CONST_ATTR(out_current_heater_raw_available, "0 1");
73
74static struct attribute *hdc2010_attributes[] = {
75 &iio_const_attr_out_current_heater_raw_available.dev_attr.attr,
76 NULL
77};
78
79static const struct attribute_group hdc2010_attribute_group = {
80 .attrs = hdc2010_attributes,
81};
82
83static const struct iio_chan_spec hdc2010_channels[] = {
84 {
85 .type = IIO_TEMP,
86 .address = HDC2010_GROUP_TEMP,
87 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
88 BIT(IIO_CHAN_INFO_PEAK) |
89 BIT(IIO_CHAN_INFO_OFFSET) |
90 BIT(IIO_CHAN_INFO_SCALE),
91 },
92 {
93 .type = IIO_HUMIDITYRELATIVE,
94 .address = HDC2010_GROUP_HUMIDITY,
95 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
96 BIT(IIO_CHAN_INFO_PEAK) |
97 BIT(IIO_CHAN_INFO_SCALE),
98 },
99 {
100 .type = IIO_CURRENT,
101 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
102 .extend_name = "heater",
103 .output = 1,
104 },
105};
106
107static int hdc2010_update_drdy_config(struct hdc2010_data *data,
108 char mask, char val)
109{
110 u8 tmp = (~mask & data->drdy_config) | val;
111 int ret;
112
113 ret = i2c_smbus_write_byte_data(data->client,
114 HDC2010_REG_RESET_DRDY_INT_CONF, tmp);
115 if (ret)
116 return ret;
117
118 data->drdy_config = tmp;
119
120 return 0;
121}
122
123static int hdc2010_get_prim_measurement_word(struct hdc2010_data *data,
124 struct iio_chan_spec const *chan)
125{
126 struct i2c_client *client = data->client;
127 s32 ret;
128
129 ret = i2c_smbus_read_word_data(client,
130 hdc2010_reg_translation[chan->address].primary);
131
132 if (ret < 0)
133 dev_err(&client->dev, "Could not read sensor measurement word\n");
134
135 return ret;
136}
137
138static int hdc2010_get_peak_measurement_byte(struct hdc2010_data *data,
139 struct iio_chan_spec const *chan)
140{
141 struct i2c_client *client = data->client;
142 s32 ret;
143
144 ret = i2c_smbus_read_byte_data(client,
145 hdc2010_reg_translation[chan->address].peak);
146
147 if (ret < 0)
148 dev_err(&client->dev, "Could not read sensor measurement byte\n");
149
150 return ret;
151}
152
153static int hdc2010_get_heater_status(struct hdc2010_data *data)
154{
155 return !!(data->drdy_config & HDC2010_HEATER_EN);
156}
157
158static int hdc2010_read_raw(struct iio_dev *indio_dev,
159 struct iio_chan_spec const *chan, int *val,
160 int *val2, long mask)
161{
162 struct hdc2010_data *data = iio_priv(indio_dev);
163
164 switch (mask) {
165 case IIO_CHAN_INFO_RAW: {
166 int ret;
167
168 if (chan->type == IIO_CURRENT) {
169 *val = hdc2010_get_heater_status(data);
170 return IIO_VAL_INT;
171 }
172 ret = iio_device_claim_direct_mode(indio_dev);
173 if (ret)
174 return ret;
175 mutex_lock(&data->lock);
176 ret = hdc2010_get_prim_measurement_word(data, chan);
177 mutex_unlock(&data->lock);
178 iio_device_release_direct_mode(indio_dev);
179 if (ret < 0)
180 return ret;
181 *val = ret;
182 return IIO_VAL_INT;
183 }
184 case IIO_CHAN_INFO_PEAK: {
185 int ret;
186
187 ret = iio_device_claim_direct_mode(indio_dev);
188 if (ret)
189 return ret;
190 mutex_lock(&data->lock);
191 ret = hdc2010_get_peak_measurement_byte(data, chan);
192 mutex_unlock(&data->lock);
193 iio_device_release_direct_mode(indio_dev);
194 if (ret < 0)
195 return ret;
196
197 *val = ret * 256;
198 return IIO_VAL_INT;
199 }
200 case IIO_CHAN_INFO_SCALE:
201 *val2 = 65536;
202 if (chan->type == IIO_TEMP)
203 *val = 165000;
204 else
205 *val = 100000;
206 return IIO_VAL_FRACTIONAL;
207 case IIO_CHAN_INFO_OFFSET:
208 *val = -15887;
209 *val2 = 515151;
210 return IIO_VAL_INT_PLUS_MICRO;
211 default:
212 return -EINVAL;
213 }
214}
215
216static int hdc2010_write_raw(struct iio_dev *indio_dev,
217 struct iio_chan_spec const *chan,
218 int val, int val2, long mask)
219{
220 struct hdc2010_data *data = iio_priv(indio_dev);
221 int new, ret;
222
223 switch (mask) {
224 case IIO_CHAN_INFO_RAW:
225 if (chan->type != IIO_CURRENT || val2 != 0)
226 return -EINVAL;
227
228 switch (val) {
229 case 1:
230 new = HDC2010_HEATER_EN;
231 break;
232 case 0:
233 new = 0;
234 break;
235 default:
236 return -EINVAL;
237 }
238
239 mutex_lock(&data->lock);
240 ret = hdc2010_update_drdy_config(data, HDC2010_HEATER_EN, new);
241 mutex_unlock(&data->lock);
242 return ret;
243 default:
244 return -EINVAL;
245 }
246}
247
248static const struct iio_info hdc2010_info = {
249 .read_raw = hdc2010_read_raw,
250 .write_raw = hdc2010_write_raw,
251 .attrs = &hdc2010_attribute_group,
252};
253
254static int hdc2010_probe(struct i2c_client *client,
255 const struct i2c_device_id *id)
256{
257 struct iio_dev *indio_dev;
258 struct hdc2010_data *data;
259 u8 tmp;
260 int ret;
261
262 if (!i2c_check_functionality(client->adapter,
263 I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_BYTE | I2C_FUNC_I2C))
264 return -EOPNOTSUPP;
265
266 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
267 if (!indio_dev)
268 return -ENOMEM;
269
270 data = iio_priv(indio_dev);
271 i2c_set_clientdata(client, indio_dev);
272 data->client = client;
273 mutex_init(&data->lock);
274
275 indio_dev->dev.parent = &client->dev;
276
277
278
279
280 indio_dev->name = "hdc2010";
281 indio_dev->modes = INDIO_DIRECT_MODE;
282 indio_dev->info = &hdc2010_info;
283
284 indio_dev->channels = hdc2010_channels;
285 indio_dev->num_channels = ARRAY_SIZE(hdc2010_channels);
286
287
288 ret = hdc2010_update_drdy_config(data, HDC2010_AMM, HDC2010_AMM);
289 if (ret)
290 return ret;
291
292
293
294
295
296 tmp = (data->measurement_config & ~HDC2010_MEAS_CONF) |
297 HDC2010_MEAS_TRIG;
298
299 ret = i2c_smbus_write_byte_data(client, HDC2010_REG_MEASUREMENT_CONF, tmp);
300 if (ret) {
301 dev_warn(&client->dev, "Unable to set up measurement\n");
302 if (hdc2010_update_drdy_config(data, HDC2010_AMM, 0))
303 dev_warn(&client->dev, "Unable to restore default AMM\n");
304 return ret;
305 }
306
307 data->measurement_config = tmp;
308
309 return iio_device_register(indio_dev);
310}
311
312static int hdc2010_remove(struct i2c_client *client)
313{
314 struct iio_dev *indio_dev = i2c_get_clientdata(client);
315 struct hdc2010_data *data = iio_priv(indio_dev);
316
317 iio_device_unregister(indio_dev);
318
319
320 if (hdc2010_update_drdy_config(data, HDC2010_AMM, 0))
321 dev_warn(&client->dev, "Unable to restore default AMM\n");
322
323 return 0;
324}
325
326static const struct i2c_device_id hdc2010_id[] = {
327 { "hdc2010" },
328 { "hdc2080" },
329 { }
330};
331MODULE_DEVICE_TABLE(i2c, hdc2010_id);
332
333static const struct of_device_id hdc2010_dt_ids[] = {
334 { .compatible = "ti,hdc2010" },
335 { .compatible = "ti,hdc2080" },
336 { }
337};
338MODULE_DEVICE_TABLE(of, hdc2010_dt_ids);
339
340static struct i2c_driver hdc2010_driver = {
341 .driver = {
342 .name = "hdc2010",
343 .of_match_table = hdc2010_dt_ids,
344 },
345 .probe = hdc2010_probe,
346 .remove = hdc2010_remove,
347 .id_table = hdc2010_id,
348};
349module_i2c_driver(hdc2010_driver);
350
351MODULE_AUTHOR("Eugene Zaikonnikov <ez@norphonic.com>");
352MODULE_DESCRIPTION("TI HDC2010 humidity and temperature sensor driver");
353MODULE_LICENSE("GPL");
354
