1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21#include <linux/err.h>
22#include <linux/i2c.h>
23#include <linux/delay.h>
24#include <linux/module.h>
25#include <linux/pm.h>
26#include <linux/bitops.h>
27#include <linux/of.h>
28#include <linux/irq.h>
29#include <linux/interrupt.h>
30
31#include <linux/iio/iio.h>
32#include <linux/iio/sysfs.h>
33#include <linux/iio/events.h>
34
35#define TMP007_TDIE 0x01
36#define TMP007_CONFIG 0x02
37#define TMP007_TOBJECT 0x03
38#define TMP007_STATUS 0x04
39#define TMP007_STATUS_MASK 0x05
40#define TMP007_TOBJ_HIGH_LIMIT 0x06
41#define TMP007_TOBJ_LOW_LIMIT 0x07
42#define TMP007_TDIE_HIGH_LIMIT 0x08
43#define TMP007_TDIE_LOW_LIMIT 0x09
44#define TMP007_MANUFACTURER_ID 0x1e
45#define TMP007_DEVICE_ID 0x1f
46
47#define TMP007_CONFIG_CONV_EN BIT(12)
48#define TMP007_CONFIG_TC_EN BIT(6)
49#define TMP007_CONFIG_CR_MASK GENMASK(11, 9)
50#define TMP007_CONFIG_ALERT_EN BIT(8)
51#define TMP007_CONFIG_CR_SHIFT 9
52
53
54#define TMP007_STATUS_ALERT BIT(15)
55#define TMP007_STATUS_CONV_READY BIT(14)
56#define TMP007_STATUS_OHF BIT(13)
57#define TMP007_STATUS_OLF BIT(12)
58#define TMP007_STATUS_LHF BIT(11)
59#define TMP007_STATUS_LLF BIT(10)
60#define TMP007_STATUS_DATA_VALID BIT(9)
61
62#define TMP007_MANUFACTURER_MAGIC 0x5449
63#define TMP007_DEVICE_MAGIC 0x0078
64
65#define TMP007_TEMP_SHIFT 2
66
67struct tmp007_data {
68 struct i2c_client *client;
69 struct mutex lock;
70 u16 config;
71 u16 status_mask;
72};
73
74static const int tmp007_avgs[5][2] = { {4, 0}, {2, 0}, {1, 0},
75 {0, 500000}, {0, 250000} };
76
77static int tmp007_read_temperature(struct tmp007_data *data, u8 reg)
78{
79 s32 ret;
80 int tries = 50;
81
82 while (tries-- > 0) {
83 ret = i2c_smbus_read_word_swapped(data->client,
84 TMP007_STATUS);
85 if (ret < 0)
86 return ret;
87 if ((ret & TMP007_STATUS_CONV_READY) &&
88 !(ret & TMP007_STATUS_DATA_VALID))
89 break;
90 msleep(100);
91 }
92
93 if (tries < 0)
94 return -EIO;
95
96 return i2c_smbus_read_word_swapped(data->client, reg);
97}
98
99static int tmp007_powerdown(struct tmp007_data *data)
100{
101 return i2c_smbus_write_word_swapped(data->client, TMP007_CONFIG,
102 data->config & ~TMP007_CONFIG_CONV_EN);
103}
104
105static int tmp007_read_raw(struct iio_dev *indio_dev,
106 struct iio_chan_spec const *channel, int *val,
107 int *val2, long mask)
108{
109 struct tmp007_data *data = iio_priv(indio_dev);
110 s32 ret;
111 int conv_rate;
112
113 switch (mask) {
114 case IIO_CHAN_INFO_RAW:
115 switch (channel->channel2) {
116 case IIO_MOD_TEMP_AMBIENT:
117 ret = i2c_smbus_read_word_swapped(data->client, TMP007_TDIE);
118 if (ret < 0)
119 return ret;
120 break;
121 case IIO_MOD_TEMP_OBJECT:
122 ret = tmp007_read_temperature(data, TMP007_TOBJECT);
123 if (ret < 0)
124 return ret;
125 break;
126 default:
127 return -EINVAL;
128 }
129
130 *val = sign_extend32(ret, 15) >> TMP007_TEMP_SHIFT;
131
132 return IIO_VAL_INT;
133 case IIO_CHAN_INFO_SCALE:
134 *val = 31;
135 *val2 = 250000;
136
137 return IIO_VAL_INT_PLUS_MICRO;
138 case IIO_CHAN_INFO_SAMP_FREQ:
139 conv_rate = (data->config & TMP007_CONFIG_CR_MASK)
140 >> TMP007_CONFIG_CR_SHIFT;
141 *val = tmp007_avgs[conv_rate][0];
142 *val2 = tmp007_avgs[conv_rate][1];
143
144 return IIO_VAL_INT_PLUS_MICRO;
145 default:
146 return -EINVAL;
147 }
148}
149
150static int tmp007_write_raw(struct iio_dev *indio_dev,
151 struct iio_chan_spec const *channel, int val,
152 int val2, long mask)
153{
154 struct tmp007_data *data = iio_priv(indio_dev);
155 int i;
156 u16 tmp;
157
158 if (mask == IIO_CHAN_INFO_SAMP_FREQ) {
159 for (i = 0; i < ARRAY_SIZE(tmp007_avgs); i++) {
160 if ((val == tmp007_avgs[i][0]) &&
161 (val2 == tmp007_avgs[i][1])) {
162 tmp = data->config & ~TMP007_CONFIG_CR_MASK;
163 tmp |= (i << TMP007_CONFIG_CR_SHIFT);
164
165 return i2c_smbus_write_word_swapped(data->client,
166 TMP007_CONFIG,
167 data->config = tmp);
168 }
169 }
170 }
171
172 return -EINVAL;
173}
174
175static irqreturn_t tmp007_interrupt_handler(int irq, void *private)
176{
177 struct iio_dev *indio_dev = private;
178 struct tmp007_data *data = iio_priv(indio_dev);
179 int ret;
180
181 ret = i2c_smbus_read_word_swapped(data->client, TMP007_STATUS);
182 if ((ret < 0) || !(ret & (TMP007_STATUS_OHF | TMP007_STATUS_OLF |
183 TMP007_STATUS_LHF | TMP007_STATUS_LLF)))
184 return IRQ_NONE;
185
186 if (ret & TMP007_STATUS_OHF)
187 iio_push_event(indio_dev,
188 IIO_MOD_EVENT_CODE(IIO_TEMP, 0,
189 IIO_MOD_TEMP_OBJECT,
190 IIO_EV_TYPE_THRESH,
191 IIO_EV_DIR_RISING),
192 iio_get_time_ns(indio_dev));
193
194 if (ret & TMP007_STATUS_OLF)
195 iio_push_event(indio_dev,
196 IIO_MOD_EVENT_CODE(IIO_TEMP, 0,
197 IIO_MOD_TEMP_OBJECT,
198 IIO_EV_TYPE_THRESH,
199 IIO_EV_DIR_FALLING),
200 iio_get_time_ns(indio_dev));
201
202 if (ret & TMP007_STATUS_LHF)
203 iio_push_event(indio_dev,
204 IIO_MOD_EVENT_CODE(IIO_TEMP, 0,
205 IIO_MOD_TEMP_AMBIENT,
206 IIO_EV_TYPE_THRESH,
207 IIO_EV_DIR_RISING),
208 iio_get_time_ns(indio_dev));
209
210 if (ret & TMP007_STATUS_LLF)
211 iio_push_event(indio_dev,
212 IIO_MOD_EVENT_CODE(IIO_TEMP, 0,
213 IIO_MOD_TEMP_AMBIENT,
214 IIO_EV_TYPE_THRESH,
215 IIO_EV_DIR_FALLING),
216 iio_get_time_ns(indio_dev));
217
218 return IRQ_HANDLED;
219}
220
221static int tmp007_write_event_config(struct iio_dev *indio_dev,
222 const struct iio_chan_spec *chan, enum iio_event_type type,
223 enum iio_event_direction dir, int state)
224{
225 struct tmp007_data *data = iio_priv(indio_dev);
226 unsigned int status_mask;
227 int ret;
228
229 switch (chan->channel2) {
230 case IIO_MOD_TEMP_AMBIENT:
231 if (dir == IIO_EV_DIR_RISING)
232 status_mask = TMP007_STATUS_LHF;
233 else
234 status_mask = TMP007_STATUS_LLF;
235 break;
236 case IIO_MOD_TEMP_OBJECT:
237 if (dir == IIO_EV_DIR_RISING)
238 status_mask = TMP007_STATUS_OHF;
239 else
240 status_mask = TMP007_STATUS_OLF;
241 break;
242 default:
243 return -EINVAL;
244 }
245
246 mutex_lock(&data->lock);
247 ret = i2c_smbus_read_word_swapped(data->client, TMP007_STATUS_MASK);
248 mutex_unlock(&data->lock);
249 if (ret < 0)
250 return ret;
251
252 if (state)
253 ret |= status_mask;
254 else
255 ret &= ~status_mask;
256
257 return i2c_smbus_write_word_swapped(data->client, TMP007_STATUS_MASK,
258 data->status_mask = ret);
259}
260
261static int tmp007_read_event_config(struct iio_dev *indio_dev,
262 const struct iio_chan_spec *chan, enum iio_event_type type,
263 enum iio_event_direction dir)
264{
265 struct tmp007_data *data = iio_priv(indio_dev);
266 unsigned int mask;
267
268 switch (chan->channel2) {
269 case IIO_MOD_TEMP_AMBIENT:
270 if (dir == IIO_EV_DIR_RISING)
271 mask = TMP007_STATUS_LHF;
272 else
273 mask = TMP007_STATUS_LLF;
274 break;
275 case IIO_MOD_TEMP_OBJECT:
276 if (dir == IIO_EV_DIR_RISING)
277 mask = TMP007_STATUS_OHF;
278 else
279 mask = TMP007_STATUS_OLF;
280 break;
281 default:
282 return -EINVAL;
283 }
284
285 return !!(data->status_mask & mask);
286}
287
288static int tmp007_read_thresh(struct iio_dev *indio_dev,
289 const struct iio_chan_spec *chan, enum iio_event_type type,
290 enum iio_event_direction dir, enum iio_event_info info,
291 int *val, int *val2)
292{
293 struct tmp007_data *data = iio_priv(indio_dev);
294 int ret;
295 u8 reg;
296
297 switch (chan->channel2) {
298 case IIO_MOD_TEMP_AMBIENT:
299 if (dir == IIO_EV_DIR_RISING)
300 reg = TMP007_TDIE_HIGH_LIMIT;
301 else
302 reg = TMP007_TDIE_LOW_LIMIT;
303 break;
304 case IIO_MOD_TEMP_OBJECT:
305 if (dir == IIO_EV_DIR_RISING)
306 reg = TMP007_TOBJ_HIGH_LIMIT;
307 else
308 reg = TMP007_TOBJ_LOW_LIMIT;
309 break;
310 default:
311 return -EINVAL;
312 }
313
314 ret = i2c_smbus_read_word_swapped(data->client, reg);
315 if (ret < 0)
316 return ret;
317
318
319 *val = sign_extend32(ret, 15) >> 7;
320
321 return IIO_VAL_INT;
322}
323
324static int tmp007_write_thresh(struct iio_dev *indio_dev,
325 const struct iio_chan_spec *chan, enum iio_event_type type,
326 enum iio_event_direction dir, enum iio_event_info info,
327 int val, int val2)
328{
329 struct tmp007_data *data = iio_priv(indio_dev);
330 u8 reg;
331
332 switch (chan->channel2) {
333 case IIO_MOD_TEMP_AMBIENT:
334 if (dir == IIO_EV_DIR_RISING)
335 reg = TMP007_TDIE_HIGH_LIMIT;
336 else
337 reg = TMP007_TDIE_LOW_LIMIT;
338 break;
339 case IIO_MOD_TEMP_OBJECT:
340 if (dir == IIO_EV_DIR_RISING)
341 reg = TMP007_TOBJ_HIGH_LIMIT;
342 else
343 reg = TMP007_TOBJ_LOW_LIMIT;
344 break;
345 default:
346 return -EINVAL;
347 }
348
349
350 if (val < -256 || val > 255)
351 return -EINVAL;
352
353
354 return i2c_smbus_write_word_swapped(data->client, reg, (val << 7));
355}
356
357static IIO_CONST_ATTR(sampling_frequency_available, "4 2 1 0.5 0.25");
358
359static struct attribute *tmp007_attributes[] = {
360 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
361 NULL
362};
363
364static const struct attribute_group tmp007_attribute_group = {
365 .attrs = tmp007_attributes,
366};
367
368static const struct iio_event_spec tmp007_obj_event[] = {
369 {
370 .type = IIO_EV_TYPE_THRESH,
371 .dir = IIO_EV_DIR_RISING,
372 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
373 BIT(IIO_EV_INFO_ENABLE),
374 },
375 {
376 .type = IIO_EV_TYPE_THRESH,
377 .dir = IIO_EV_DIR_FALLING,
378 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
379 BIT(IIO_EV_INFO_ENABLE),
380 },
381};
382
383static const struct iio_event_spec tmp007_die_event[] = {
384 {
385 .type = IIO_EV_TYPE_THRESH,
386 .dir = IIO_EV_DIR_RISING,
387 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
388 BIT(IIO_EV_INFO_ENABLE),
389 },
390 {
391 .type = IIO_EV_TYPE_THRESH,
392 .dir = IIO_EV_DIR_FALLING,
393 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
394 BIT(IIO_EV_INFO_ENABLE),
395 },
396};
397
398static const struct iio_chan_spec tmp007_channels[] = {
399 {
400 .type = IIO_TEMP,
401 .modified = 1,
402 .channel2 = IIO_MOD_TEMP_AMBIENT,
403 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
404 BIT(IIO_CHAN_INFO_SCALE),
405 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
406 .event_spec = tmp007_die_event,
407 .num_event_specs = ARRAY_SIZE(tmp007_die_event),
408 },
409 {
410 .type = IIO_TEMP,
411 .modified = 1,
412 .channel2 = IIO_MOD_TEMP_OBJECT,
413 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
414 BIT(IIO_CHAN_INFO_SCALE),
415 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
416 .event_spec = tmp007_obj_event,
417 .num_event_specs = ARRAY_SIZE(tmp007_obj_event),
418 }
419};
420
421static const struct iio_info tmp007_info = {
422 .read_raw = tmp007_read_raw,
423 .write_raw = tmp007_write_raw,
424 .read_event_config = tmp007_read_event_config,
425 .write_event_config = tmp007_write_event_config,
426 .read_event_value = tmp007_read_thresh,
427 .write_event_value = tmp007_write_thresh,
428 .attrs = &tmp007_attribute_group,
429};
430
431static bool tmp007_identify(struct i2c_client *client)
432{
433 int manf_id, dev_id;
434
435 manf_id = i2c_smbus_read_word_swapped(client, TMP007_MANUFACTURER_ID);
436 if (manf_id < 0)
437 return false;
438
439 dev_id = i2c_smbus_read_word_swapped(client, TMP007_DEVICE_ID);
440 if (dev_id < 0)
441 return false;
442
443 return (manf_id == TMP007_MANUFACTURER_MAGIC && dev_id == TMP007_DEVICE_MAGIC);
444}
445
446static int tmp007_probe(struct i2c_client *client,
447 const struct i2c_device_id *tmp007_id)
448{
449 struct tmp007_data *data;
450 struct iio_dev *indio_dev;
451 int ret;
452
453 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
454 return -EOPNOTSUPP;
455
456 if (!tmp007_identify(client)) {
457 dev_err(&client->dev, "TMP007 not found\n");
458 return -ENODEV;
459 }
460
461 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
462 if (!indio_dev)
463 return -ENOMEM;
464
465 data = iio_priv(indio_dev);
466 i2c_set_clientdata(client, indio_dev);
467 data->client = client;
468 mutex_init(&data->lock);
469
470 indio_dev->dev.parent = &client->dev;
471 indio_dev->name = "tmp007";
472 indio_dev->modes = INDIO_DIRECT_MODE;
473 indio_dev->info = &tmp007_info;
474
475 indio_dev->channels = tmp007_channels;
476 indio_dev->num_channels = ARRAY_SIZE(tmp007_channels);
477
478
479
480
481
482
483
484
485 ret = i2c_smbus_read_word_swapped(data->client, TMP007_CONFIG);
486 if (ret < 0)
487 return ret;
488
489 data->config = ret;
490 data->config |= (TMP007_CONFIG_CONV_EN | TMP007_CONFIG_ALERT_EN | TMP007_CONFIG_TC_EN);
491
492 ret = i2c_smbus_write_word_swapped(data->client, TMP007_CONFIG,
493 data->config);
494 if (ret < 0)
495 return ret;
496
497
498
499
500
501
502
503
504
505
506
507
508 ret = i2c_smbus_read_word_swapped(data->client, TMP007_STATUS_MASK);
509 if (ret < 0)
510 goto error_powerdown;
511
512 data->status_mask = ret;
513 data->status_mask |= (TMP007_STATUS_OHF | TMP007_STATUS_OLF
514 | TMP007_STATUS_LHF | TMP007_STATUS_LLF);
515
516 ret = i2c_smbus_write_word_swapped(data->client, TMP007_STATUS_MASK, data->status_mask);
517 if (ret < 0)
518 goto error_powerdown;
519
520 if (client->irq) {
521 ret = devm_request_threaded_irq(&client->dev, client->irq,
522 NULL, tmp007_interrupt_handler,
523 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
524 tmp007_id->name, indio_dev);
525 if (ret) {
526 dev_err(&client->dev, "irq request error %d\n", -ret);
527 goto error_powerdown;
528 }
529 }
530
531 return iio_device_register(indio_dev);
532
533error_powerdown:
534 tmp007_powerdown(data);
535
536 return ret;
537}
538
539static int tmp007_remove(struct i2c_client *client)
540{
541 struct iio_dev *indio_dev = i2c_get_clientdata(client);
542 struct tmp007_data *data = iio_priv(indio_dev);
543
544 iio_device_unregister(indio_dev);
545 tmp007_powerdown(data);
546
547 return 0;
548}
549
550#ifdef CONFIG_PM_SLEEP
551static int tmp007_suspend(struct device *dev)
552{
553 struct tmp007_data *data = iio_priv(i2c_get_clientdata(
554 to_i2c_client(dev)));
555
556 return tmp007_powerdown(data);
557}
558
559static int tmp007_resume(struct device *dev)
560{
561 struct tmp007_data *data = iio_priv(i2c_get_clientdata(
562 to_i2c_client(dev)));
563
564 return i2c_smbus_write_word_swapped(data->client, TMP007_CONFIG,
565 data->config | TMP007_CONFIG_CONV_EN);
566}
567#endif
568
569static SIMPLE_DEV_PM_OPS(tmp007_pm_ops, tmp007_suspend, tmp007_resume);
570
571static const struct of_device_id tmp007_of_match[] = {
572 { .compatible = "ti,tmp007", },
573 { },
574};
575MODULE_DEVICE_TABLE(of, tmp007_of_match);
576
577static const struct i2c_device_id tmp007_id[] = {
578 { "tmp007", 0 },
579 { }
580};
581MODULE_DEVICE_TABLE(i2c, tmp007_id);
582
583static struct i2c_driver tmp007_driver = {
584 .driver = {
585 .name = "tmp007",
586 .of_match_table = of_match_ptr(tmp007_of_match),
587 .pm = &tmp007_pm_ops,
588 },
589 .probe = tmp007_probe,
590 .remove = tmp007_remove,
591 .id_table = tmp007_id,
592};
593module_i2c_driver(tmp007_driver);
594
595MODULE_AUTHOR("Manivannan Sadhasivam <manivannanece23@gmail.com>");
596MODULE_DESCRIPTION("TI TMP007 IR thermopile sensor driver");
597MODULE_LICENSE("GPL");
598
