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16#include <linux/delay.h>
17#include <linux/module.h>
18#include <linux/init.h>
19#include <linux/i2c.h>
20
21#include <linux/iio/iio.h>
22#include <linux/iio/sysfs.h>
23#include <linux/iio/buffer.h>
24#include <linux/iio/trigger_consumer.h>
25#include <linux/iio/triggered_buffer.h>
26
27#define HDC100X_REG_TEMP 0x00
28#define HDC100X_REG_HUMIDITY 0x01
29
30#define HDC100X_REG_CONFIG 0x02
31#define HDC100X_REG_CONFIG_ACQ_MODE BIT(12)
32#define HDC100X_REG_CONFIG_HEATER_EN BIT(13)
33
34struct hdc100x_data {
35 struct i2c_client *client;
36 struct mutex lock;
37 u16 config;
38
39
40 int adc_int_us[2];
41};
42
43
44static const int hdc100x_int_time[][3] = {
45 { 6350, 3650, 0 },
46 { 6500, 3850, 2500 },
47};
48
49
50static const struct {
51 int shift;
52 int mask;
53} hdc100x_resolution_shift[2] = {
54 {
55 .shift = 10,
56 .mask = 1
57 },
58 {
59 .shift = 8,
60 .mask = 3,
61 },
62};
63
64static IIO_CONST_ATTR(temp_integration_time_available,
65 "0.00365 0.00635");
66
67static IIO_CONST_ATTR(humidityrelative_integration_time_available,
68 "0.0025 0.00385 0.0065");
69
70static IIO_CONST_ATTR(out_current_heater_raw_available,
71 "0 1");
72
73static struct attribute *hdc100x_attributes[] = {
74 &iio_const_attr_temp_integration_time_available.dev_attr.attr,
75 &iio_const_attr_humidityrelative_integration_time_available.dev_attr.attr,
76 &iio_const_attr_out_current_heater_raw_available.dev_attr.attr,
77 NULL
78};
79
80static const struct attribute_group hdc100x_attribute_group = {
81 .attrs = hdc100x_attributes,
82};
83
84static const struct iio_chan_spec hdc100x_channels[] = {
85 {
86 .type = IIO_TEMP,
87 .address = HDC100X_REG_TEMP,
88 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
89 BIT(IIO_CHAN_INFO_SCALE) |
90 BIT(IIO_CHAN_INFO_INT_TIME) |
91 BIT(IIO_CHAN_INFO_OFFSET),
92 .scan_index = 0,
93 .scan_type = {
94 .sign = 's',
95 .realbits = 16,
96 .storagebits = 16,
97 .endianness = IIO_BE,
98 },
99 },
100 {
101 .type = IIO_HUMIDITYRELATIVE,
102 .address = HDC100X_REG_HUMIDITY,
103 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
104 BIT(IIO_CHAN_INFO_SCALE) |
105 BIT(IIO_CHAN_INFO_INT_TIME),
106 .scan_index = 1,
107 .scan_type = {
108 .sign = 'u',
109 .realbits = 16,
110 .storagebits = 16,
111 .endianness = IIO_BE,
112 },
113 },
114 {
115 .type = IIO_CURRENT,
116 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
117 .extend_name = "heater",
118 .output = 1,
119 .scan_index = -1,
120 },
121 IIO_CHAN_SOFT_TIMESTAMP(2),
122};
123
124static const unsigned long hdc100x_scan_masks[] = {0x3, 0};
125
126static int hdc100x_update_config(struct hdc100x_data *data, int mask, int val)
127{
128 int tmp = (~mask & data->config) | val;
129 int ret;
130
131 ret = i2c_smbus_write_word_swapped(data->client,
132 HDC100X_REG_CONFIG, tmp);
133 if (!ret)
134 data->config = tmp;
135
136 return ret;
137}
138
139static int hdc100x_set_it_time(struct hdc100x_data *data, int chan, int val2)
140{
141 int shift = hdc100x_resolution_shift[chan].shift;
142 int ret = -EINVAL;
143 int i;
144
145 for (i = 0; i < ARRAY_SIZE(hdc100x_int_time[chan]); i++) {
146 if (val2 && val2 == hdc100x_int_time[chan][i]) {
147 ret = hdc100x_update_config(data,
148 hdc100x_resolution_shift[chan].mask << shift,
149 i << shift);
150 if (!ret)
151 data->adc_int_us[chan] = val2;
152 break;
153 }
154 }
155
156 return ret;
157}
158
159static int hdc100x_get_measurement(struct hdc100x_data *data,
160 struct iio_chan_spec const *chan)
161{
162 struct i2c_client *client = data->client;
163 int delay = data->adc_int_us[chan->address];
164 int ret;
165 __be16 val;
166
167
168 ret = i2c_smbus_write_byte(client, chan->address);
169 if (ret < 0) {
170 dev_err(&client->dev, "cannot start measurement");
171 return ret;
172 }
173
174
175 usleep_range(delay, delay + 1000);
176
177
178 ret = i2c_master_recv(data->client, (char *)&val, sizeof(val));
179 if (ret < 0) {
180 dev_err(&client->dev, "cannot read sensor data\n");
181 return ret;
182 }
183 return be16_to_cpu(val);
184}
185
186static int hdc100x_get_heater_status(struct hdc100x_data *data)
187{
188 return !!(data->config & HDC100X_REG_CONFIG_HEATER_EN);
189}
190
191static int hdc100x_read_raw(struct iio_dev *indio_dev,
192 struct iio_chan_spec const *chan, int *val,
193 int *val2, long mask)
194{
195 struct hdc100x_data *data = iio_priv(indio_dev);
196
197 switch (mask) {
198 case IIO_CHAN_INFO_RAW: {
199 int ret;
200
201 mutex_lock(&data->lock);
202 if (chan->type == IIO_CURRENT) {
203 *val = hdc100x_get_heater_status(data);
204 ret = IIO_VAL_INT;
205 } else {
206 ret = iio_device_claim_direct_mode(indio_dev);
207 if (ret) {
208 mutex_unlock(&data->lock);
209 return ret;
210 }
211
212 ret = hdc100x_get_measurement(data, chan);
213 iio_device_release_direct_mode(indio_dev);
214 if (ret >= 0) {
215 *val = ret;
216 ret = IIO_VAL_INT;
217 }
218 }
219 mutex_unlock(&data->lock);
220 return ret;
221 }
222 case IIO_CHAN_INFO_INT_TIME:
223 *val = 0;
224 *val2 = data->adc_int_us[chan->address];
225 return IIO_VAL_INT_PLUS_MICRO;
226 case IIO_CHAN_INFO_SCALE:
227 if (chan->type == IIO_TEMP) {
228 *val = 165000;
229 *val2 = 65536;
230 return IIO_VAL_FRACTIONAL;
231 } else {
232 *val = 100000;
233 *val2 = 65536;
234 return IIO_VAL_FRACTIONAL;
235 }
236 break;
237 case IIO_CHAN_INFO_OFFSET:
238 *val = -15887;
239 *val2 = 515151;
240 return IIO_VAL_INT_PLUS_MICRO;
241 default:
242 return -EINVAL;
243 }
244}
245
246static int hdc100x_write_raw(struct iio_dev *indio_dev,
247 struct iio_chan_spec const *chan,
248 int val, int val2, long mask)
249{
250 struct hdc100x_data *data = iio_priv(indio_dev);
251 int ret = -EINVAL;
252
253 switch (mask) {
254 case IIO_CHAN_INFO_INT_TIME:
255 if (val != 0)
256 return -EINVAL;
257
258 mutex_lock(&data->lock);
259 ret = hdc100x_set_it_time(data, chan->address, val2);
260 mutex_unlock(&data->lock);
261 return ret;
262 case IIO_CHAN_INFO_RAW:
263 if (chan->type != IIO_CURRENT || val2 != 0)
264 return -EINVAL;
265
266 mutex_lock(&data->lock);
267 ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_HEATER_EN,
268 val ? HDC100X_REG_CONFIG_HEATER_EN : 0);
269 mutex_unlock(&data->lock);
270 return ret;
271 default:
272 return -EINVAL;
273 }
274}
275
276static int hdc100x_buffer_postenable(struct iio_dev *indio_dev)
277{
278 struct hdc100x_data *data = iio_priv(indio_dev);
279 int ret;
280
281 ret = iio_triggered_buffer_postenable(indio_dev);
282 if (ret)
283 return ret;
284
285
286 mutex_lock(&data->lock);
287 ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE,
288 HDC100X_REG_CONFIG_ACQ_MODE);
289 mutex_unlock(&data->lock);
290 if (ret)
291 iio_triggered_buffer_predisable(indio_dev);
292
293 return ret;
294}
295
296static int hdc100x_buffer_predisable(struct iio_dev *indio_dev)
297{
298 struct hdc100x_data *data = iio_priv(indio_dev);
299 int ret, ret2;
300
301 mutex_lock(&data->lock);
302 ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE, 0);
303 mutex_unlock(&data->lock);
304
305 ret2 = iio_triggered_buffer_predisable(indio_dev);
306 if (ret == 0)
307 ret = ret2;
308
309 return ret;
310}
311
312static const struct iio_buffer_setup_ops hdc_buffer_setup_ops = {
313 .postenable = hdc100x_buffer_postenable,
314 .predisable = hdc100x_buffer_predisable,
315};
316
317static irqreturn_t hdc100x_trigger_handler(int irq, void *p)
318{
319 struct iio_poll_func *pf = p;
320 struct iio_dev *indio_dev = pf->indio_dev;
321 struct hdc100x_data *data = iio_priv(indio_dev);
322 struct i2c_client *client = data->client;
323 int delay = data->adc_int_us[0] + data->adc_int_us[1];
324 int ret;
325 s16 buf[8];
326
327
328 mutex_lock(&data->lock);
329 ret = i2c_smbus_write_byte(client, HDC100X_REG_TEMP);
330 if (ret < 0) {
331 dev_err(&client->dev, "cannot start measurement\n");
332 goto err;
333 }
334 usleep_range(delay, delay + 1000);
335
336 ret = i2c_master_recv(client, (u8 *)buf, 4);
337 if (ret < 0) {
338 dev_err(&client->dev, "cannot read sensor data\n");
339 goto err;
340 }
341
342 iio_push_to_buffers_with_timestamp(indio_dev, buf,
343 iio_get_time_ns(indio_dev));
344err:
345 mutex_unlock(&data->lock);
346 iio_trigger_notify_done(indio_dev->trig);
347
348 return IRQ_HANDLED;
349}
350
351static const struct iio_info hdc100x_info = {
352 .read_raw = hdc100x_read_raw,
353 .write_raw = hdc100x_write_raw,
354 .attrs = &hdc100x_attribute_group,
355};
356
357static int hdc100x_probe(struct i2c_client *client,
358 const struct i2c_device_id *id)
359{
360 struct iio_dev *indio_dev;
361 struct hdc100x_data *data;
362 int ret;
363
364 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA |
365 I2C_FUNC_SMBUS_BYTE | I2C_FUNC_I2C))
366 return -EOPNOTSUPP;
367
368 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
369 if (!indio_dev)
370 return -ENOMEM;
371
372 data = iio_priv(indio_dev);
373 i2c_set_clientdata(client, indio_dev);
374 data->client = client;
375 mutex_init(&data->lock);
376
377 indio_dev->dev.parent = &client->dev;
378 indio_dev->name = dev_name(&client->dev);
379 indio_dev->modes = INDIO_DIRECT_MODE;
380 indio_dev->info = &hdc100x_info;
381
382 indio_dev->channels = hdc100x_channels;
383 indio_dev->num_channels = ARRAY_SIZE(hdc100x_channels);
384 indio_dev->available_scan_masks = hdc100x_scan_masks;
385
386
387 hdc100x_set_it_time(data, 0, hdc100x_int_time[0][0]);
388 hdc100x_set_it_time(data, 1, hdc100x_int_time[1][0]);
389 hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE, 0);
390
391 ret = devm_iio_triggered_buffer_setup(&client->dev,
392 indio_dev, NULL,
393 hdc100x_trigger_handler,
394 &hdc_buffer_setup_ops);
395 if (ret < 0) {
396 dev_err(&client->dev, "iio triggered buffer setup failed\n");
397 return ret;
398 }
399
400 return devm_iio_device_register(&client->dev, indio_dev);
401}
402
403static const struct i2c_device_id hdc100x_id[] = {
404 { "hdc100x", 0 },
405 { "hdc1000", 0 },
406 { "hdc1008", 0 },
407 { "hdc1010", 0 },
408 { "hdc1050", 0 },
409 { "hdc1080", 0 },
410 { }
411};
412MODULE_DEVICE_TABLE(i2c, hdc100x_id);
413
414static const struct of_device_id hdc100x_dt_ids[] = {
415 { .compatible = "ti,hdc1000" },
416 { .compatible = "ti,hdc1008" },
417 { .compatible = "ti,hdc1010" },
418 { .compatible = "ti,hdc1050" },
419 { .compatible = "ti,hdc1080" },
420 { }
421};
422MODULE_DEVICE_TABLE(of, hdc100x_dt_ids);
423
424static struct i2c_driver hdc100x_driver = {
425 .driver = {
426 .name = "hdc100x",
427 .of_match_table = of_match_ptr(hdc100x_dt_ids),
428 },
429 .probe = hdc100x_probe,
430 .id_table = hdc100x_id,
431};
432module_i2c_driver(hdc100x_driver);
433
434MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
435MODULE_DESCRIPTION("TI HDC100x humidity and temperature sensor driver");
436MODULE_LICENSE("GPL");
437
