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1 | /** |
2 | * opt3001.c - Texas Instruments OPT3001 Light Sensor | |
3 | * | |
4 | * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com | |
5 | * | |
6 | * Author: Andreas Dannenberg <dannenberg@ti.com> | |
7 | * Based on previous work from: Felipe Balbi <balbi@ti.com> | |
8 | * | |
9 | * This program is free software: you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License version 2 of the License | |
11 | * as published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
14 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
16 | * more details. | |
17 | */ | |
18 | ||
19 | #include <linux/bitops.h> | |
20 | #include <linux/delay.h> | |
21 | #include <linux/device.h> | |
22 | #include <linux/i2c.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/irq.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/mutex.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/types.h> | |
30 | ||
31 | #include <linux/iio/events.h> | |
32 | #include <linux/iio/iio.h> | |
33 | #include <linux/iio/sysfs.h> | |
34 | ||
35 | #define OPT3001_RESULT 0x00 | |
36 | #define OPT3001_CONFIGURATION 0x01 | |
37 | #define OPT3001_LOW_LIMIT 0x02 | |
38 | #define OPT3001_HIGH_LIMIT 0x03 | |
39 | #define OPT3001_MANUFACTURER_ID 0x7e | |
40 | #define OPT3001_DEVICE_ID 0x7f | |
41 | ||
42 | #define OPT3001_CONFIGURATION_RN_MASK (0xf << 12) | |
43 | #define OPT3001_CONFIGURATION_RN_AUTO (0xc << 12) | |
44 | ||
45 | #define OPT3001_CONFIGURATION_CT BIT(11) | |
46 | ||
47 | #define OPT3001_CONFIGURATION_M_MASK (3 << 9) | |
48 | #define OPT3001_CONFIGURATION_M_SHUTDOWN (0 << 9) | |
49 | #define OPT3001_CONFIGURATION_M_SINGLE (1 << 9) | |
50 | #define OPT3001_CONFIGURATION_M_CONTINUOUS (2 << 9) /* also 3 << 9 */ | |
51 | ||
52 | #define OPT3001_CONFIGURATION_OVF BIT(8) | |
53 | #define OPT3001_CONFIGURATION_CRF BIT(7) | |
54 | #define OPT3001_CONFIGURATION_FH BIT(6) | |
55 | #define OPT3001_CONFIGURATION_FL BIT(5) | |
56 | #define OPT3001_CONFIGURATION_L BIT(4) | |
57 | #define OPT3001_CONFIGURATION_POL BIT(3) | |
58 | #define OPT3001_CONFIGURATION_ME BIT(2) | |
59 | ||
60 | #define OPT3001_CONFIGURATION_FC_MASK (3 << 0) | |
61 | ||
62 | /* The end-of-conversion enable is located in the low-limit register */ | |
63 | #define OPT3001_LOW_LIMIT_EOC_ENABLE 0xc000 | |
64 | ||
65 | #define OPT3001_REG_EXPONENT(n) ((n) >> 12) | |
66 | #define OPT3001_REG_MANTISSA(n) ((n) & 0xfff) | |
67 | ||
68 | /* | |
69 | * Time to wait for conversion result to be ready. The device datasheet | |
70 | * worst-case max value is 880ms. Add some slack to be on the safe side. | |
71 | */ | |
72 | #define OPT3001_RESULT_READY_TIMEOUT msecs_to_jiffies(1000) | |
73 | ||
74 | struct opt3001 { | |
75 | struct i2c_client *client; | |
76 | struct device *dev; | |
77 | ||
78 | struct mutex lock; | |
79 | u16 ok_to_ignore_lock:1; | |
80 | u16 result_ready:1; | |
81 | wait_queue_head_t result_ready_queue; | |
82 | u16 result; | |
83 | ||
84 | u32 int_time; | |
85 | u32 mode; | |
86 | ||
87 | u16 high_thresh_mantissa; | |
88 | u16 low_thresh_mantissa; | |
89 | ||
90 | u8 high_thresh_exp; | |
91 | u8 low_thresh_exp; | |
92 | }; | |
93 | ||
94 | struct opt3001_scale { | |
95 | int val; | |
96 | int val2; | |
97 | }; | |
98 | ||
99 | static const struct opt3001_scale opt3001_scales[] = { | |
100 | { | |
101 | .val = 40, | |
102 | .val2 = 950000, | |
103 | }, | |
104 | { | |
105 | .val = 81, | |
106 | .val2 = 900000, | |
107 | }, | |
108 | { | |
109 | .val = 163, | |
110 | .val2 = 800000, | |
111 | }, | |
112 | { | |
113 | .val = 327, | |
114 | .val2 = 600000, | |
115 | }, | |
116 | { | |
117 | .val = 655, | |
118 | .val2 = 200000, | |
119 | }, | |
120 | { | |
121 | .val = 1310, | |
122 | .val2 = 400000, | |
123 | }, | |
124 | { | |
125 | .val = 2620, | |
126 | .val2 = 800000, | |
127 | }, | |
128 | { | |
129 | .val = 5241, | |
130 | .val2 = 600000, | |
131 | }, | |
132 | { | |
133 | .val = 10483, | |
134 | .val2 = 200000, | |
135 | }, | |
136 | { | |
137 | .val = 20966, | |
138 | .val2 = 400000, | |
139 | }, | |
140 | { | |
141 | .val = 83865, | |
142 | .val2 = 600000, | |
143 | }, | |
144 | }; | |
145 | ||
146 | static int opt3001_find_scale(const struct opt3001 *opt, int val, | |
147 | int val2, u8 *exponent) | |
148 | { | |
149 | int i; | |
150 | ||
151 | for (i = 0; i < ARRAY_SIZE(opt3001_scales); i++) { | |
152 | const struct opt3001_scale *scale = &opt3001_scales[i]; | |
153 | ||
154 | /* | |
155 | * Combine the integer and micro parts for comparison | |
156 | * purposes. Use milli lux precision to avoid 32-bit integer | |
157 | * overflows. | |
158 | */ | |
159 | if ((val * 1000 + val2 / 1000) <= | |
160 | (scale->val * 1000 + scale->val2 / 1000)) { | |
161 | *exponent = i; | |
162 | return 0; | |
163 | } | |
164 | } | |
165 | ||
166 | return -EINVAL; | |
167 | } | |
168 | ||
169 | static void opt3001_to_iio_ret(struct opt3001 *opt, u8 exponent, | |
170 | u16 mantissa, int *val, int *val2) | |
171 | { | |
172 | int lux; | |
173 | ||
174 | lux = 10 * (mantissa << exponent); | |
175 | *val = lux / 1000; | |
176 | *val2 = (lux - (*val * 1000)) * 1000; | |
177 | } | |
178 | ||
179 | static void opt3001_set_mode(struct opt3001 *opt, u16 *reg, u16 mode) | |
180 | { | |
181 | *reg &= ~OPT3001_CONFIGURATION_M_MASK; | |
182 | *reg |= mode; | |
183 | opt->mode = mode; | |
184 | } | |
185 | ||
186 | static IIO_CONST_ATTR_INT_TIME_AVAIL("0.1 0.8"); | |
187 | ||
188 | static struct attribute *opt3001_attributes[] = { | |
189 | &iio_const_attr_integration_time_available.dev_attr.attr, | |
190 | NULL | |
191 | }; | |
192 | ||
193 | static const struct attribute_group opt3001_attribute_group = { | |
194 | .attrs = opt3001_attributes, | |
195 | }; | |
196 | ||
197 | static const struct iio_event_spec opt3001_event_spec[] = { | |
198 | { | |
199 | .type = IIO_EV_TYPE_THRESH, | |
200 | .dir = IIO_EV_DIR_RISING, | |
201 | .mask_separate = BIT(IIO_EV_INFO_VALUE) | | |
202 | BIT(IIO_EV_INFO_ENABLE), | |
203 | }, | |
204 | { | |
205 | .type = IIO_EV_TYPE_THRESH, | |
206 | .dir = IIO_EV_DIR_FALLING, | |
207 | .mask_separate = BIT(IIO_EV_INFO_VALUE) | | |
208 | BIT(IIO_EV_INFO_ENABLE), | |
209 | }, | |
210 | }; | |
211 | ||
212 | static const struct iio_chan_spec opt3001_channels[] = { | |
213 | { | |
214 | .type = IIO_LIGHT, | |
215 | .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) | | |
216 | BIT(IIO_CHAN_INFO_INT_TIME), | |
217 | .event_spec = opt3001_event_spec, | |
218 | .num_event_specs = ARRAY_SIZE(opt3001_event_spec), | |
219 | }, | |
220 | IIO_CHAN_SOFT_TIMESTAMP(1), | |
221 | }; | |
222 | ||
223 | static int opt3001_get_lux(struct opt3001 *opt, int *val, int *val2) | |
224 | { | |
225 | int ret; | |
226 | u16 mantissa; | |
227 | u16 reg; | |
228 | u8 exponent; | |
229 | u16 value; | |
230 | ||
231 | /* | |
232 | * Enable the end-of-conversion interrupt mechanism. Note that doing | |
233 | * so will overwrite the low-level limit value however we will restore | |
234 | * this value later on. | |
235 | */ | |
236 | ret = i2c_smbus_write_word_swapped(opt->client, OPT3001_LOW_LIMIT, | |
237 | OPT3001_LOW_LIMIT_EOC_ENABLE); | |
238 | if (ret < 0) { | |
239 | dev_err(opt->dev, "failed to write register %02x\n", | |
240 | OPT3001_LOW_LIMIT); | |
241 | return ret; | |
242 | } | |
243 | ||
244 | /* Reset data-ready indicator flag (will be set in the IRQ routine) */ | |
245 | opt->result_ready = false; | |
246 | ||
247 | /* Allow IRQ to access the device despite lock being set */ | |
248 | opt->ok_to_ignore_lock = true; | |
249 | ||
250 | /* Configure for single-conversion mode and start a new conversion */ | |
251 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_CONFIGURATION); | |
252 | if (ret < 0) { | |
253 | dev_err(opt->dev, "failed to read register %02x\n", | |
254 | OPT3001_CONFIGURATION); | |
255 | goto err; | |
256 | } | |
257 | ||
258 | reg = ret; | |
259 | opt3001_set_mode(opt, ®, OPT3001_CONFIGURATION_M_SINGLE); | |
260 | ||
261 | ret = i2c_smbus_write_word_swapped(opt->client, OPT3001_CONFIGURATION, | |
262 | reg); | |
263 | if (ret < 0) { | |
264 | dev_err(opt->dev, "failed to write register %02x\n", | |
265 | OPT3001_CONFIGURATION); | |
266 | goto err; | |
267 | } | |
268 | ||
269 | /* Wait for the IRQ to indicate the conversion is complete */ | |
270 | ret = wait_event_timeout(opt->result_ready_queue, opt->result_ready, | |
271 | OPT3001_RESULT_READY_TIMEOUT); | |
272 | ||
273 | err: | |
274 | /* Disallow IRQ to access the device while lock is active */ | |
275 | opt->ok_to_ignore_lock = false; | |
276 | ||
277 | if (ret == 0) | |
278 | return -ETIMEDOUT; | |
279 | else if (ret < 0) | |
280 | return ret; | |
281 | ||
282 | /* | |
283 | * Disable the end-of-conversion interrupt mechanism by restoring the | |
284 | * low-level limit value (clearing OPT3001_LOW_LIMIT_EOC_ENABLE). Note | |
285 | * that selectively clearing those enable bits would affect the actual | |
286 | * limit value due to bit-overlap and therefore can't be done. | |
287 | */ | |
288 | value = (opt->low_thresh_exp << 12) | opt->low_thresh_mantissa; | |
289 | ret = i2c_smbus_write_word_swapped(opt->client, OPT3001_LOW_LIMIT, | |
290 | value); | |
291 | if (ret < 0) { | |
292 | dev_err(opt->dev, "failed to write register %02x\n", | |
293 | OPT3001_LOW_LIMIT); | |
294 | return ret; | |
295 | } | |
296 | ||
297 | exponent = OPT3001_REG_EXPONENT(opt->result); | |
298 | mantissa = OPT3001_REG_MANTISSA(opt->result); | |
299 | ||
300 | opt3001_to_iio_ret(opt, exponent, mantissa, val, val2); | |
301 | ||
302 | return IIO_VAL_INT_PLUS_MICRO; | |
303 | } | |
304 | ||
305 | static int opt3001_get_int_time(struct opt3001 *opt, int *val, int *val2) | |
306 | { | |
307 | *val = 0; | |
308 | *val2 = opt->int_time; | |
309 | ||
310 | return IIO_VAL_INT_PLUS_MICRO; | |
311 | } | |
312 | ||
313 | static int opt3001_set_int_time(struct opt3001 *opt, int time) | |
314 | { | |
315 | int ret; | |
316 | u16 reg; | |
317 | ||
318 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_CONFIGURATION); | |
319 | if (ret < 0) { | |
320 | dev_err(opt->dev, "failed to read register %02x\n", | |
321 | OPT3001_CONFIGURATION); | |
322 | return ret; | |
323 | } | |
324 | ||
325 | reg = ret; | |
326 | ||
327 | switch (time) { | |
328 | case 100000: | |
329 | reg &= ~OPT3001_CONFIGURATION_CT; | |
330 | opt->int_time = 100000; | |
331 | break; | |
332 | case 800000: | |
333 | reg |= OPT3001_CONFIGURATION_CT; | |
334 | opt->int_time = 800000; | |
335 | break; | |
336 | default: | |
337 | return -EINVAL; | |
338 | } | |
339 | ||
340 | return i2c_smbus_write_word_swapped(opt->client, OPT3001_CONFIGURATION, | |
341 | reg); | |
342 | } | |
343 | ||
344 | static int opt3001_read_raw(struct iio_dev *iio, | |
345 | struct iio_chan_spec const *chan, int *val, int *val2, | |
346 | long mask) | |
347 | { | |
348 | struct opt3001 *opt = iio_priv(iio); | |
349 | int ret; | |
350 | ||
351 | if (opt->mode == OPT3001_CONFIGURATION_M_CONTINUOUS) | |
352 | return -EBUSY; | |
353 | ||
354 | if (chan->type != IIO_LIGHT) | |
355 | return -EINVAL; | |
356 | ||
357 | mutex_lock(&opt->lock); | |
358 | ||
359 | switch (mask) { | |
360 | case IIO_CHAN_INFO_PROCESSED: | |
361 | ret = opt3001_get_lux(opt, val, val2); | |
362 | break; | |
363 | case IIO_CHAN_INFO_INT_TIME: | |
364 | ret = opt3001_get_int_time(opt, val, val2); | |
365 | break; | |
366 | default: | |
367 | ret = -EINVAL; | |
368 | } | |
369 | ||
370 | mutex_unlock(&opt->lock); | |
371 | ||
372 | return ret; | |
373 | } | |
374 | ||
375 | static int opt3001_write_raw(struct iio_dev *iio, | |
376 | struct iio_chan_spec const *chan, int val, int val2, | |
377 | long mask) | |
378 | { | |
379 | struct opt3001 *opt = iio_priv(iio); | |
380 | int ret; | |
381 | ||
382 | if (opt->mode == OPT3001_CONFIGURATION_M_CONTINUOUS) | |
383 | return -EBUSY; | |
384 | ||
385 | if (chan->type != IIO_LIGHT) | |
386 | return -EINVAL; | |
387 | ||
388 | if (mask != IIO_CHAN_INFO_INT_TIME) | |
389 | return -EINVAL; | |
390 | ||
391 | if (val != 0) | |
392 | return -EINVAL; | |
393 | ||
394 | mutex_lock(&opt->lock); | |
395 | ret = opt3001_set_int_time(opt, val2); | |
396 | mutex_unlock(&opt->lock); | |
397 | ||
398 | return ret; | |
399 | } | |
400 | ||
401 | static int opt3001_read_event_value(struct iio_dev *iio, | |
402 | const struct iio_chan_spec *chan, enum iio_event_type type, | |
403 | enum iio_event_direction dir, enum iio_event_info info, | |
404 | int *val, int *val2) | |
405 | { | |
406 | struct opt3001 *opt = iio_priv(iio); | |
407 | int ret = IIO_VAL_INT_PLUS_MICRO; | |
408 | ||
409 | mutex_lock(&opt->lock); | |
410 | ||
411 | switch (dir) { | |
412 | case IIO_EV_DIR_RISING: | |
413 | opt3001_to_iio_ret(opt, opt->high_thresh_exp, | |
414 | opt->high_thresh_mantissa, val, val2); | |
415 | break; | |
416 | case IIO_EV_DIR_FALLING: | |
417 | opt3001_to_iio_ret(opt, opt->low_thresh_exp, | |
418 | opt->low_thresh_mantissa, val, val2); | |
419 | break; | |
420 | default: | |
421 | ret = -EINVAL; | |
422 | } | |
423 | ||
424 | mutex_unlock(&opt->lock); | |
425 | ||
426 | return ret; | |
427 | } | |
428 | ||
429 | static int opt3001_write_event_value(struct iio_dev *iio, | |
430 | const struct iio_chan_spec *chan, enum iio_event_type type, | |
431 | enum iio_event_direction dir, enum iio_event_info info, | |
432 | int val, int val2) | |
433 | { | |
434 | struct opt3001 *opt = iio_priv(iio); | |
435 | int ret; | |
436 | ||
437 | u16 mantissa; | |
438 | u16 value; | |
439 | u16 reg; | |
440 | ||
441 | u8 exponent; | |
442 | ||
443 | if (val < 0) | |
444 | return -EINVAL; | |
445 | ||
446 | mutex_lock(&opt->lock); | |
447 | ||
448 | ret = opt3001_find_scale(opt, val, val2, &exponent); | |
449 | if (ret < 0) { | |
450 | dev_err(opt->dev, "can't find scale for %d.%06u\n", val, val2); | |
451 | goto err; | |
452 | } | |
453 | ||
454 | mantissa = (((val * 1000) + (val2 / 1000)) / 10) >> exponent; | |
455 | value = (exponent << 12) | mantissa; | |
456 | ||
457 | switch (dir) { | |
458 | case IIO_EV_DIR_RISING: | |
459 | reg = OPT3001_HIGH_LIMIT; | |
460 | opt->high_thresh_mantissa = mantissa; | |
461 | opt->high_thresh_exp = exponent; | |
462 | break; | |
463 | case IIO_EV_DIR_FALLING: | |
464 | reg = OPT3001_LOW_LIMIT; | |
465 | opt->low_thresh_mantissa = mantissa; | |
466 | opt->low_thresh_exp = exponent; | |
467 | break; | |
468 | default: | |
469 | ret = -EINVAL; | |
470 | goto err; | |
471 | } | |
472 | ||
473 | ret = i2c_smbus_write_word_swapped(opt->client, reg, value); | |
474 | if (ret < 0) { | |
475 | dev_err(opt->dev, "failed to write register %02x\n", reg); | |
476 | goto err; | |
477 | } | |
478 | ||
479 | err: | |
480 | mutex_unlock(&opt->lock); | |
481 | ||
482 | return ret; | |
483 | } | |
484 | ||
485 | static int opt3001_read_event_config(struct iio_dev *iio, | |
486 | const struct iio_chan_spec *chan, enum iio_event_type type, | |
487 | enum iio_event_direction dir) | |
488 | { | |
489 | struct opt3001 *opt = iio_priv(iio); | |
490 | ||
491 | return opt->mode == OPT3001_CONFIGURATION_M_CONTINUOUS; | |
492 | } | |
493 | ||
494 | static int opt3001_write_event_config(struct iio_dev *iio, | |
495 | const struct iio_chan_spec *chan, enum iio_event_type type, | |
496 | enum iio_event_direction dir, int state) | |
497 | { | |
498 | struct opt3001 *opt = iio_priv(iio); | |
499 | int ret; | |
500 | u16 mode; | |
501 | u16 reg; | |
502 | ||
503 | if (state && opt->mode == OPT3001_CONFIGURATION_M_CONTINUOUS) | |
504 | return 0; | |
505 | ||
506 | if (!state && opt->mode == OPT3001_CONFIGURATION_M_SHUTDOWN) | |
507 | return 0; | |
508 | ||
509 | mutex_lock(&opt->lock); | |
510 | ||
511 | mode = state ? OPT3001_CONFIGURATION_M_CONTINUOUS | |
512 | : OPT3001_CONFIGURATION_M_SHUTDOWN; | |
513 | ||
514 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_CONFIGURATION); | |
515 | if (ret < 0) { | |
516 | dev_err(opt->dev, "failed to read register %02x\n", | |
517 | OPT3001_CONFIGURATION); | |
518 | goto err; | |
519 | } | |
520 | ||
521 | reg = ret; | |
522 | opt3001_set_mode(opt, ®, mode); | |
523 | ||
524 | ret = i2c_smbus_write_word_swapped(opt->client, OPT3001_CONFIGURATION, | |
525 | reg); | |
526 | if (ret < 0) { | |
527 | dev_err(opt->dev, "failed to write register %02x\n", | |
528 | OPT3001_CONFIGURATION); | |
529 | goto err; | |
530 | } | |
531 | ||
532 | err: | |
533 | mutex_unlock(&opt->lock); | |
534 | ||
535 | return ret; | |
536 | } | |
537 | ||
538 | static const struct iio_info opt3001_info = { | |
539 | .driver_module = THIS_MODULE, | |
540 | .attrs = &opt3001_attribute_group, | |
541 | .read_raw = opt3001_read_raw, | |
542 | .write_raw = opt3001_write_raw, | |
543 | .read_event_value = opt3001_read_event_value, | |
544 | .write_event_value = opt3001_write_event_value, | |
545 | .read_event_config = opt3001_read_event_config, | |
546 | .write_event_config = opt3001_write_event_config, | |
547 | }; | |
548 | ||
549 | static int opt3001_read_id(struct opt3001 *opt) | |
550 | { | |
551 | char manufacturer[2]; | |
552 | u16 device_id; | |
553 | int ret; | |
554 | ||
555 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_MANUFACTURER_ID); | |
556 | if (ret < 0) { | |
557 | dev_err(opt->dev, "failed to read register %02x\n", | |
558 | OPT3001_MANUFACTURER_ID); | |
559 | return ret; | |
560 | } | |
561 | ||
562 | manufacturer[0] = ret >> 8; | |
563 | manufacturer[1] = ret & 0xff; | |
564 | ||
565 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_DEVICE_ID); | |
566 | if (ret < 0) { | |
567 | dev_err(opt->dev, "failed to read register %02x\n", | |
568 | OPT3001_DEVICE_ID); | |
569 | return ret; | |
570 | } | |
571 | ||
572 | device_id = ret; | |
573 | ||
574 | dev_info(opt->dev, "Found %c%c OPT%04x\n", manufacturer[0], | |
575 | manufacturer[1], device_id); | |
576 | ||
577 | return 0; | |
578 | } | |
579 | ||
580 | static int opt3001_configure(struct opt3001 *opt) | |
581 | { | |
582 | int ret; | |
583 | u16 reg; | |
584 | ||
585 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_CONFIGURATION); | |
586 | if (ret < 0) { | |
587 | dev_err(opt->dev, "failed to read register %02x\n", | |
588 | OPT3001_CONFIGURATION); | |
589 | return ret; | |
590 | } | |
591 | ||
592 | reg = ret; | |
593 | ||
594 | /* Enable automatic full-scale setting mode */ | |
595 | reg &= ~OPT3001_CONFIGURATION_RN_MASK; | |
596 | reg |= OPT3001_CONFIGURATION_RN_AUTO; | |
597 | ||
598 | /* Reflect status of the device's integration time setting */ | |
599 | if (reg & OPT3001_CONFIGURATION_CT) | |
600 | opt->int_time = 800000; | |
601 | else | |
602 | opt->int_time = 100000; | |
603 | ||
604 | /* Ensure device is in shutdown initially */ | |
605 | opt3001_set_mode(opt, ®, OPT3001_CONFIGURATION_M_SHUTDOWN); | |
606 | ||
607 | /* Configure for latched window-style comparison operation */ | |
608 | reg |= OPT3001_CONFIGURATION_L; | |
609 | reg &= ~OPT3001_CONFIGURATION_POL; | |
610 | reg &= ~OPT3001_CONFIGURATION_ME; | |
611 | reg &= ~OPT3001_CONFIGURATION_FC_MASK; | |
612 | ||
613 | ret = i2c_smbus_write_word_swapped(opt->client, OPT3001_CONFIGURATION, | |
614 | reg); | |
615 | if (ret < 0) { | |
616 | dev_err(opt->dev, "failed to write register %02x\n", | |
617 | OPT3001_CONFIGURATION); | |
618 | return ret; | |
619 | } | |
620 | ||
621 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_LOW_LIMIT); | |
622 | if (ret < 0) { | |
623 | dev_err(opt->dev, "failed to read register %02x\n", | |
624 | OPT3001_LOW_LIMIT); | |
625 | return ret; | |
626 | } | |
627 | ||
628 | opt->low_thresh_mantissa = OPT3001_REG_MANTISSA(ret); | |
629 | opt->low_thresh_exp = OPT3001_REG_EXPONENT(ret); | |
630 | ||
631 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_HIGH_LIMIT); | |
632 | if (ret < 0) { | |
633 | dev_err(opt->dev, "failed to read register %02x\n", | |
634 | OPT3001_HIGH_LIMIT); | |
635 | return ret; | |
636 | } | |
637 | ||
638 | opt->high_thresh_mantissa = OPT3001_REG_MANTISSA(ret); | |
639 | opt->high_thresh_exp = OPT3001_REG_EXPONENT(ret); | |
640 | ||
641 | return 0; | |
642 | } | |
643 | ||
644 | static irqreturn_t opt3001_irq(int irq, void *_iio) | |
645 | { | |
646 | struct iio_dev *iio = _iio; | |
647 | struct opt3001 *opt = iio_priv(iio); | |
648 | int ret; | |
649 | ||
650 | if (!opt->ok_to_ignore_lock) | |
651 | mutex_lock(&opt->lock); | |
652 | ||
653 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_CONFIGURATION); | |
654 | if (ret < 0) { | |
655 | dev_err(opt->dev, "failed to read register %02x\n", | |
656 | OPT3001_CONFIGURATION); | |
657 | goto out; | |
658 | } | |
659 | ||
660 | if ((ret & OPT3001_CONFIGURATION_M_MASK) == | |
661 | OPT3001_CONFIGURATION_M_CONTINUOUS) { | |
662 | if (ret & OPT3001_CONFIGURATION_FH) | |
663 | iio_push_event(iio, | |
664 | IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0, | |
665 | IIO_EV_TYPE_THRESH, | |
666 | IIO_EV_DIR_RISING), | |
667 | iio_get_time_ns()); | |
668 | if (ret & OPT3001_CONFIGURATION_FL) | |
669 | iio_push_event(iio, | |
670 | IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0, | |
671 | IIO_EV_TYPE_THRESH, | |
672 | IIO_EV_DIR_FALLING), | |
673 | iio_get_time_ns()); | |
674 | } else if (ret & OPT3001_CONFIGURATION_CRF) { | |
675 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_RESULT); | |
676 | if (ret < 0) { | |
677 | dev_err(opt->dev, "failed to read register %02x\n", | |
678 | OPT3001_RESULT); | |
679 | goto out; | |
680 | } | |
681 | opt->result = ret; | |
682 | opt->result_ready = true; | |
683 | wake_up(&opt->result_ready_queue); | |
684 | } | |
685 | ||
686 | out: | |
687 | if (!opt->ok_to_ignore_lock) | |
688 | mutex_unlock(&opt->lock); | |
689 | ||
690 | return IRQ_HANDLED; | |
691 | } | |
692 | ||
693 | static int opt3001_probe(struct i2c_client *client, | |
694 | const struct i2c_device_id *id) | |
695 | { | |
696 | struct device *dev = &client->dev; | |
697 | ||
698 | struct iio_dev *iio; | |
699 | struct opt3001 *opt; | |
700 | int irq = client->irq; | |
701 | int ret; | |
702 | ||
703 | iio = devm_iio_device_alloc(dev, sizeof(*opt)); | |
704 | if (!iio) | |
705 | return -ENOMEM; | |
706 | ||
707 | opt = iio_priv(iio); | |
708 | opt->client = client; | |
709 | opt->dev = dev; | |
710 | ||
711 | mutex_init(&opt->lock); | |
712 | init_waitqueue_head(&opt->result_ready_queue); | |
713 | i2c_set_clientdata(client, iio); | |
714 | ||
715 | ret = opt3001_read_id(opt); | |
716 | if (ret) | |
717 | return ret; | |
718 | ||
719 | ret = opt3001_configure(opt); | |
720 | if (ret) | |
721 | return ret; | |
722 | ||
723 | iio->name = client->name; | |
724 | iio->channels = opt3001_channels; | |
725 | iio->num_channels = ARRAY_SIZE(opt3001_channels); | |
726 | iio->dev.parent = dev; | |
727 | iio->modes = INDIO_DIRECT_MODE; | |
728 | iio->info = &opt3001_info; | |
729 | ||
730 | ret = devm_iio_device_register(dev, iio); | |
731 | if (ret) { | |
732 | dev_err(dev, "failed to register IIO device\n"); | |
733 | return ret; | |
734 | } | |
735 | ||
736 | ret = request_threaded_irq(irq, NULL, opt3001_irq, | |
737 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
738 | "opt3001", iio); | |
739 | if (ret) { | |
740 | dev_err(dev, "failed to request IRQ #%d\n", irq); | |
741 | return ret; | |
742 | } | |
743 | ||
744 | return 0; | |
745 | } | |
746 | ||
747 | static int opt3001_remove(struct i2c_client *client) | |
748 | { | |
749 | struct iio_dev *iio = i2c_get_clientdata(client); | |
750 | struct opt3001 *opt = iio_priv(iio); | |
751 | int ret; | |
752 | u16 reg; | |
753 | ||
754 | free_irq(client->irq, iio); | |
755 | ||
756 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_CONFIGURATION); | |
757 | if (ret < 0) { | |
758 | dev_err(opt->dev, "failed to read register %02x\n", | |
759 | OPT3001_CONFIGURATION); | |
760 | return ret; | |
761 | } | |
762 | ||
763 | reg = ret; | |
764 | opt3001_set_mode(opt, ®, OPT3001_CONFIGURATION_M_SHUTDOWN); | |
765 | ||
766 | ret = i2c_smbus_write_word_swapped(opt->client, OPT3001_CONFIGURATION, | |
767 | reg); | |
768 | if (ret < 0) { | |
769 | dev_err(opt->dev, "failed to write register %02x\n", | |
770 | OPT3001_CONFIGURATION); | |
771 | return ret; | |
772 | } | |
773 | ||
774 | return 0; | |
775 | } | |
776 | ||
777 | static const struct i2c_device_id opt3001_id[] = { | |
778 | { "opt3001", 0 }, | |
779 | { } /* Terminating Entry */ | |
780 | }; | |
781 | MODULE_DEVICE_TABLE(i2c, opt3001_id); | |
782 | ||
783 | static const struct of_device_id opt3001_of_match[] = { | |
784 | { .compatible = "ti,opt3001" }, | |
785 | { } | |
786 | }; | |
787 | ||
788 | static struct i2c_driver opt3001_driver = { | |
789 | .probe = opt3001_probe, | |
790 | .remove = opt3001_remove, | |
791 | .id_table = opt3001_id, | |
792 | ||
793 | .driver = { | |
794 | .name = "opt3001", | |
795 | .of_match_table = of_match_ptr(opt3001_of_match), | |
94a9b7b1 AD |
796 | }, |
797 | }; | |
798 | ||
799 | module_i2c_driver(opt3001_driver); | |
800 | ||
801 | MODULE_LICENSE("GPL v2"); | |
802 | MODULE_AUTHOR("Andreas Dannenberg <dannenberg@ti.com>"); | |
803 | MODULE_DESCRIPTION("Texas Instruments OPT3001 Light Sensor Driver"); |