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94a9b7b1 AD |
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 | ||
564cff82 AK |
68 | #define OPT3001_INT_TIME_LONG 800000 |
69 | #define OPT3001_INT_TIME_SHORT 100000 | |
70 | ||
94a9b7b1 AD |
71 | /* |
72 | * Time to wait for conversion result to be ready. The device datasheet | |
ac663db3 AK |
73 | * sect. 6.5 states results are ready after total integration time plus 3ms. |
74 | * This results in worst-case max values of 113ms or 883ms, respectively. | |
75 | * Add some slack to be on the safe side. | |
94a9b7b1 | 76 | */ |
ac663db3 AK |
77 | #define OPT3001_RESULT_READY_SHORT 150 |
78 | #define OPT3001_RESULT_READY_LONG 1000 | |
94a9b7b1 AD |
79 | |
80 | struct opt3001 { | |
81 | struct i2c_client *client; | |
82 | struct device *dev; | |
83 | ||
84 | struct mutex lock; | |
84e8d090 AK |
85 | bool ok_to_ignore_lock; |
86 | bool result_ready; | |
94a9b7b1 AD |
87 | wait_queue_head_t result_ready_queue; |
88 | u16 result; | |
89 | ||
90 | u32 int_time; | |
91 | u32 mode; | |
92 | ||
93 | u16 high_thresh_mantissa; | |
94 | u16 low_thresh_mantissa; | |
95 | ||
96 | u8 high_thresh_exp; | |
97 | u8 low_thresh_exp; | |
ac663db3 AK |
98 | |
99 | bool use_irq; | |
94a9b7b1 AD |
100 | }; |
101 | ||
102 | struct opt3001_scale { | |
103 | int val; | |
104 | int val2; | |
105 | }; | |
106 | ||
107 | static const struct opt3001_scale opt3001_scales[] = { | |
108 | { | |
109 | .val = 40, | |
110 | .val2 = 950000, | |
111 | }, | |
112 | { | |
113 | .val = 81, | |
114 | .val2 = 900000, | |
115 | }, | |
116 | { | |
117 | .val = 163, | |
118 | .val2 = 800000, | |
119 | }, | |
120 | { | |
121 | .val = 327, | |
122 | .val2 = 600000, | |
123 | }, | |
124 | { | |
125 | .val = 655, | |
126 | .val2 = 200000, | |
127 | }, | |
128 | { | |
129 | .val = 1310, | |
130 | .val2 = 400000, | |
131 | }, | |
132 | { | |
133 | .val = 2620, | |
134 | .val2 = 800000, | |
135 | }, | |
136 | { | |
137 | .val = 5241, | |
138 | .val2 = 600000, | |
139 | }, | |
140 | { | |
141 | .val = 10483, | |
142 | .val2 = 200000, | |
143 | }, | |
144 | { | |
145 | .val = 20966, | |
146 | .val2 = 400000, | |
147 | }, | |
148 | { | |
149 | .val = 83865, | |
150 | .val2 = 600000, | |
151 | }, | |
152 | }; | |
153 | ||
154 | static int opt3001_find_scale(const struct opt3001 *opt, int val, | |
155 | int val2, u8 *exponent) | |
156 | { | |
157 | int i; | |
158 | ||
159 | for (i = 0; i < ARRAY_SIZE(opt3001_scales); i++) { | |
160 | const struct opt3001_scale *scale = &opt3001_scales[i]; | |
161 | ||
162 | /* | |
163 | * Combine the integer and micro parts for comparison | |
164 | * purposes. Use milli lux precision to avoid 32-bit integer | |
165 | * overflows. | |
166 | */ | |
167 | if ((val * 1000 + val2 / 1000) <= | |
168 | (scale->val * 1000 + scale->val2 / 1000)) { | |
169 | *exponent = i; | |
170 | return 0; | |
171 | } | |
172 | } | |
173 | ||
174 | return -EINVAL; | |
175 | } | |
176 | ||
177 | static void opt3001_to_iio_ret(struct opt3001 *opt, u8 exponent, | |
178 | u16 mantissa, int *val, int *val2) | |
179 | { | |
180 | int lux; | |
181 | ||
182 | lux = 10 * (mantissa << exponent); | |
183 | *val = lux / 1000; | |
184 | *val2 = (lux - (*val * 1000)) * 1000; | |
185 | } | |
186 | ||
187 | static void opt3001_set_mode(struct opt3001 *opt, u16 *reg, u16 mode) | |
188 | { | |
189 | *reg &= ~OPT3001_CONFIGURATION_M_MASK; | |
190 | *reg |= mode; | |
191 | opt->mode = mode; | |
192 | } | |
193 | ||
194 | static IIO_CONST_ATTR_INT_TIME_AVAIL("0.1 0.8"); | |
195 | ||
196 | static struct attribute *opt3001_attributes[] = { | |
197 | &iio_const_attr_integration_time_available.dev_attr.attr, | |
198 | NULL | |
199 | }; | |
200 | ||
201 | static const struct attribute_group opt3001_attribute_group = { | |
202 | .attrs = opt3001_attributes, | |
203 | }; | |
204 | ||
205 | static const struct iio_event_spec opt3001_event_spec[] = { | |
206 | { | |
207 | .type = IIO_EV_TYPE_THRESH, | |
208 | .dir = IIO_EV_DIR_RISING, | |
209 | .mask_separate = BIT(IIO_EV_INFO_VALUE) | | |
210 | BIT(IIO_EV_INFO_ENABLE), | |
211 | }, | |
212 | { | |
213 | .type = IIO_EV_TYPE_THRESH, | |
214 | .dir = IIO_EV_DIR_FALLING, | |
215 | .mask_separate = BIT(IIO_EV_INFO_VALUE) | | |
216 | BIT(IIO_EV_INFO_ENABLE), | |
217 | }, | |
218 | }; | |
219 | ||
220 | static const struct iio_chan_spec opt3001_channels[] = { | |
221 | { | |
222 | .type = IIO_LIGHT, | |
223 | .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) | | |
224 | BIT(IIO_CHAN_INFO_INT_TIME), | |
225 | .event_spec = opt3001_event_spec, | |
226 | .num_event_specs = ARRAY_SIZE(opt3001_event_spec), | |
227 | }, | |
228 | IIO_CHAN_SOFT_TIMESTAMP(1), | |
229 | }; | |
230 | ||
231 | static int opt3001_get_lux(struct opt3001 *opt, int *val, int *val2) | |
232 | { | |
233 | int ret; | |
234 | u16 mantissa; | |
235 | u16 reg; | |
236 | u8 exponent; | |
237 | u16 value; | |
ac663db3 | 238 | long timeout; |
94a9b7b1 | 239 | |
ac663db3 AK |
240 | if (opt->use_irq) { |
241 | /* | |
242 | * Enable the end-of-conversion interrupt mechanism. Note that | |
243 | * doing so will overwrite the low-level limit value however we | |
244 | * will restore this value later on. | |
245 | */ | |
246 | ret = i2c_smbus_write_word_swapped(opt->client, | |
247 | OPT3001_LOW_LIMIT, | |
248 | OPT3001_LOW_LIMIT_EOC_ENABLE); | |
249 | if (ret < 0) { | |
250 | dev_err(opt->dev, "failed to write register %02x\n", | |
251 | OPT3001_LOW_LIMIT); | |
252 | return ret; | |
253 | } | |
254 | ||
255 | /* Allow IRQ to access the device despite lock being set */ | |
256 | opt->ok_to_ignore_lock = true; | |
94a9b7b1 AD |
257 | } |
258 | ||
ac663db3 | 259 | /* Reset data-ready indicator flag */ |
94a9b7b1 AD |
260 | opt->result_ready = false; |
261 | ||
94a9b7b1 AD |
262 | /* Configure for single-conversion mode and start a new conversion */ |
263 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_CONFIGURATION); | |
264 | if (ret < 0) { | |
265 | dev_err(opt->dev, "failed to read register %02x\n", | |
266 | OPT3001_CONFIGURATION); | |
267 | goto err; | |
268 | } | |
269 | ||
270 | reg = ret; | |
271 | opt3001_set_mode(opt, ®, OPT3001_CONFIGURATION_M_SINGLE); | |
272 | ||
273 | ret = i2c_smbus_write_word_swapped(opt->client, OPT3001_CONFIGURATION, | |
274 | reg); | |
275 | if (ret < 0) { | |
276 | dev_err(opt->dev, "failed to write register %02x\n", | |
277 | OPT3001_CONFIGURATION); | |
278 | goto err; | |
279 | } | |
280 | ||
ac663db3 AK |
281 | if (opt->use_irq) { |
282 | /* Wait for the IRQ to indicate the conversion is complete */ | |
283 | ret = wait_event_timeout(opt->result_ready_queue, | |
284 | opt->result_ready, | |
285 | msecs_to_jiffies(OPT3001_RESULT_READY_LONG)); | |
286 | } else { | |
287 | /* Sleep for result ready time */ | |
288 | timeout = (opt->int_time == OPT3001_INT_TIME_SHORT) ? | |
289 | OPT3001_RESULT_READY_SHORT : OPT3001_RESULT_READY_LONG; | |
290 | msleep(timeout); | |
291 | ||
292 | /* Check result ready flag */ | |
293 | ret = i2c_smbus_read_word_swapped(opt->client, | |
294 | OPT3001_CONFIGURATION); | |
295 | if (ret < 0) { | |
296 | dev_err(opt->dev, "failed to read register %02x\n", | |
297 | OPT3001_CONFIGURATION); | |
298 | goto err; | |
299 | } | |
300 | ||
301 | if (!(ret & OPT3001_CONFIGURATION_CRF)) { | |
302 | ret = -ETIMEDOUT; | |
303 | goto err; | |
304 | } | |
305 | ||
306 | /* Obtain value */ | |
307 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_RESULT); | |
308 | if (ret < 0) { | |
309 | dev_err(opt->dev, "failed to read register %02x\n", | |
310 | OPT3001_RESULT); | |
311 | goto err; | |
312 | } | |
313 | opt->result = ret; | |
314 | opt->result_ready = true; | |
315 | } | |
94a9b7b1 AD |
316 | |
317 | err: | |
ac663db3 AK |
318 | if (opt->use_irq) |
319 | /* Disallow IRQ to access the device while lock is active */ | |
320 | opt->ok_to_ignore_lock = false; | |
94a9b7b1 AD |
321 | |
322 | if (ret == 0) | |
323 | return -ETIMEDOUT; | |
324 | else if (ret < 0) | |
325 | return ret; | |
326 | ||
ac663db3 AK |
327 | if (opt->use_irq) { |
328 | /* | |
329 | * Disable the end-of-conversion interrupt mechanism by | |
330 | * restoring the low-level limit value (clearing | |
331 | * OPT3001_LOW_LIMIT_EOC_ENABLE). Note that selectively clearing | |
332 | * those enable bits would affect the actual limit value due to | |
333 | * bit-overlap and therefore can't be done. | |
334 | */ | |
335 | value = (opt->low_thresh_exp << 12) | opt->low_thresh_mantissa; | |
336 | ret = i2c_smbus_write_word_swapped(opt->client, | |
337 | OPT3001_LOW_LIMIT, | |
338 | value); | |
339 | if (ret < 0) { | |
340 | dev_err(opt->dev, "failed to write register %02x\n", | |
341 | OPT3001_LOW_LIMIT); | |
342 | return ret; | |
343 | } | |
94a9b7b1 AD |
344 | } |
345 | ||
346 | exponent = OPT3001_REG_EXPONENT(opt->result); | |
347 | mantissa = OPT3001_REG_MANTISSA(opt->result); | |
348 | ||
349 | opt3001_to_iio_ret(opt, exponent, mantissa, val, val2); | |
350 | ||
351 | return IIO_VAL_INT_PLUS_MICRO; | |
352 | } | |
353 | ||
354 | static int opt3001_get_int_time(struct opt3001 *opt, int *val, int *val2) | |
355 | { | |
356 | *val = 0; | |
357 | *val2 = opt->int_time; | |
358 | ||
359 | return IIO_VAL_INT_PLUS_MICRO; | |
360 | } | |
361 | ||
362 | static int opt3001_set_int_time(struct opt3001 *opt, int time) | |
363 | { | |
364 | int ret; | |
365 | u16 reg; | |
366 | ||
367 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_CONFIGURATION); | |
368 | if (ret < 0) { | |
369 | dev_err(opt->dev, "failed to read register %02x\n", | |
370 | OPT3001_CONFIGURATION); | |
371 | return ret; | |
372 | } | |
373 | ||
374 | reg = ret; | |
375 | ||
376 | switch (time) { | |
564cff82 | 377 | case OPT3001_INT_TIME_SHORT: |
94a9b7b1 | 378 | reg &= ~OPT3001_CONFIGURATION_CT; |
564cff82 | 379 | opt->int_time = OPT3001_INT_TIME_SHORT; |
94a9b7b1 | 380 | break; |
564cff82 | 381 | case OPT3001_INT_TIME_LONG: |
94a9b7b1 | 382 | reg |= OPT3001_CONFIGURATION_CT; |
564cff82 | 383 | opt->int_time = OPT3001_INT_TIME_LONG; |
94a9b7b1 AD |
384 | break; |
385 | default: | |
386 | return -EINVAL; | |
387 | } | |
388 | ||
389 | return i2c_smbus_write_word_swapped(opt->client, OPT3001_CONFIGURATION, | |
390 | reg); | |
391 | } | |
392 | ||
393 | static int opt3001_read_raw(struct iio_dev *iio, | |
394 | struct iio_chan_spec const *chan, int *val, int *val2, | |
395 | long mask) | |
396 | { | |
397 | struct opt3001 *opt = iio_priv(iio); | |
398 | int ret; | |
399 | ||
400 | if (opt->mode == OPT3001_CONFIGURATION_M_CONTINUOUS) | |
401 | return -EBUSY; | |
402 | ||
403 | if (chan->type != IIO_LIGHT) | |
404 | return -EINVAL; | |
405 | ||
406 | mutex_lock(&opt->lock); | |
407 | ||
408 | switch (mask) { | |
409 | case IIO_CHAN_INFO_PROCESSED: | |
410 | ret = opt3001_get_lux(opt, val, val2); | |
411 | break; | |
412 | case IIO_CHAN_INFO_INT_TIME: | |
413 | ret = opt3001_get_int_time(opt, val, val2); | |
414 | break; | |
415 | default: | |
416 | ret = -EINVAL; | |
417 | } | |
418 | ||
419 | mutex_unlock(&opt->lock); | |
420 | ||
421 | return ret; | |
422 | } | |
423 | ||
424 | static int opt3001_write_raw(struct iio_dev *iio, | |
425 | struct iio_chan_spec const *chan, int val, int val2, | |
426 | long mask) | |
427 | { | |
428 | struct opt3001 *opt = iio_priv(iio); | |
429 | int ret; | |
430 | ||
431 | if (opt->mode == OPT3001_CONFIGURATION_M_CONTINUOUS) | |
432 | return -EBUSY; | |
433 | ||
434 | if (chan->type != IIO_LIGHT) | |
435 | return -EINVAL; | |
436 | ||
437 | if (mask != IIO_CHAN_INFO_INT_TIME) | |
438 | return -EINVAL; | |
439 | ||
440 | if (val != 0) | |
441 | return -EINVAL; | |
442 | ||
443 | mutex_lock(&opt->lock); | |
444 | ret = opt3001_set_int_time(opt, val2); | |
445 | mutex_unlock(&opt->lock); | |
446 | ||
447 | return ret; | |
448 | } | |
449 | ||
450 | static int opt3001_read_event_value(struct iio_dev *iio, | |
451 | const struct iio_chan_spec *chan, enum iio_event_type type, | |
452 | enum iio_event_direction dir, enum iio_event_info info, | |
453 | int *val, int *val2) | |
454 | { | |
455 | struct opt3001 *opt = iio_priv(iio); | |
456 | int ret = IIO_VAL_INT_PLUS_MICRO; | |
457 | ||
458 | mutex_lock(&opt->lock); | |
459 | ||
460 | switch (dir) { | |
461 | case IIO_EV_DIR_RISING: | |
462 | opt3001_to_iio_ret(opt, opt->high_thresh_exp, | |
463 | opt->high_thresh_mantissa, val, val2); | |
464 | break; | |
465 | case IIO_EV_DIR_FALLING: | |
466 | opt3001_to_iio_ret(opt, opt->low_thresh_exp, | |
467 | opt->low_thresh_mantissa, val, val2); | |
468 | break; | |
469 | default: | |
470 | ret = -EINVAL; | |
471 | } | |
472 | ||
473 | mutex_unlock(&opt->lock); | |
474 | ||
475 | return ret; | |
476 | } | |
477 | ||
478 | static int opt3001_write_event_value(struct iio_dev *iio, | |
479 | const struct iio_chan_spec *chan, enum iio_event_type type, | |
480 | enum iio_event_direction dir, enum iio_event_info info, | |
481 | int val, int val2) | |
482 | { | |
483 | struct opt3001 *opt = iio_priv(iio); | |
484 | int ret; | |
485 | ||
486 | u16 mantissa; | |
487 | u16 value; | |
488 | u16 reg; | |
489 | ||
490 | u8 exponent; | |
491 | ||
492 | if (val < 0) | |
493 | return -EINVAL; | |
494 | ||
495 | mutex_lock(&opt->lock); | |
496 | ||
497 | ret = opt3001_find_scale(opt, val, val2, &exponent); | |
498 | if (ret < 0) { | |
499 | dev_err(opt->dev, "can't find scale for %d.%06u\n", val, val2); | |
500 | goto err; | |
501 | } | |
502 | ||
503 | mantissa = (((val * 1000) + (val2 / 1000)) / 10) >> exponent; | |
504 | value = (exponent << 12) | mantissa; | |
505 | ||
506 | switch (dir) { | |
507 | case IIO_EV_DIR_RISING: | |
508 | reg = OPT3001_HIGH_LIMIT; | |
509 | opt->high_thresh_mantissa = mantissa; | |
510 | opt->high_thresh_exp = exponent; | |
511 | break; | |
512 | case IIO_EV_DIR_FALLING: | |
513 | reg = OPT3001_LOW_LIMIT; | |
514 | opt->low_thresh_mantissa = mantissa; | |
515 | opt->low_thresh_exp = exponent; | |
516 | break; | |
517 | default: | |
518 | ret = -EINVAL; | |
519 | goto err; | |
520 | } | |
521 | ||
522 | ret = i2c_smbus_write_word_swapped(opt->client, reg, value); | |
523 | if (ret < 0) { | |
524 | dev_err(opt->dev, "failed to write register %02x\n", reg); | |
525 | goto err; | |
526 | } | |
527 | ||
528 | err: | |
529 | mutex_unlock(&opt->lock); | |
530 | ||
531 | return ret; | |
532 | } | |
533 | ||
534 | static int opt3001_read_event_config(struct iio_dev *iio, | |
535 | const struct iio_chan_spec *chan, enum iio_event_type type, | |
536 | enum iio_event_direction dir) | |
537 | { | |
538 | struct opt3001 *opt = iio_priv(iio); | |
539 | ||
540 | return opt->mode == OPT3001_CONFIGURATION_M_CONTINUOUS; | |
541 | } | |
542 | ||
543 | static int opt3001_write_event_config(struct iio_dev *iio, | |
544 | const struct iio_chan_spec *chan, enum iio_event_type type, | |
545 | enum iio_event_direction dir, int state) | |
546 | { | |
547 | struct opt3001 *opt = iio_priv(iio); | |
548 | int ret; | |
549 | u16 mode; | |
550 | u16 reg; | |
551 | ||
552 | if (state && opt->mode == OPT3001_CONFIGURATION_M_CONTINUOUS) | |
553 | return 0; | |
554 | ||
555 | if (!state && opt->mode == OPT3001_CONFIGURATION_M_SHUTDOWN) | |
556 | return 0; | |
557 | ||
558 | mutex_lock(&opt->lock); | |
559 | ||
560 | mode = state ? OPT3001_CONFIGURATION_M_CONTINUOUS | |
561 | : OPT3001_CONFIGURATION_M_SHUTDOWN; | |
562 | ||
563 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_CONFIGURATION); | |
564 | if (ret < 0) { | |
565 | dev_err(opt->dev, "failed to read register %02x\n", | |
566 | OPT3001_CONFIGURATION); | |
567 | goto err; | |
568 | } | |
569 | ||
570 | reg = ret; | |
571 | opt3001_set_mode(opt, ®, mode); | |
572 | ||
573 | ret = i2c_smbus_write_word_swapped(opt->client, OPT3001_CONFIGURATION, | |
574 | reg); | |
575 | if (ret < 0) { | |
576 | dev_err(opt->dev, "failed to write register %02x\n", | |
577 | OPT3001_CONFIGURATION); | |
578 | goto err; | |
579 | } | |
580 | ||
581 | err: | |
582 | mutex_unlock(&opt->lock); | |
583 | ||
584 | return ret; | |
585 | } | |
586 | ||
587 | static const struct iio_info opt3001_info = { | |
588 | .driver_module = THIS_MODULE, | |
589 | .attrs = &opt3001_attribute_group, | |
590 | .read_raw = opt3001_read_raw, | |
591 | .write_raw = opt3001_write_raw, | |
592 | .read_event_value = opt3001_read_event_value, | |
593 | .write_event_value = opt3001_write_event_value, | |
594 | .read_event_config = opt3001_read_event_config, | |
595 | .write_event_config = opt3001_write_event_config, | |
596 | }; | |
597 | ||
598 | static int opt3001_read_id(struct opt3001 *opt) | |
599 | { | |
600 | char manufacturer[2]; | |
601 | u16 device_id; | |
602 | int ret; | |
603 | ||
604 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_MANUFACTURER_ID); | |
605 | if (ret < 0) { | |
606 | dev_err(opt->dev, "failed to read register %02x\n", | |
607 | OPT3001_MANUFACTURER_ID); | |
608 | return ret; | |
609 | } | |
610 | ||
611 | manufacturer[0] = ret >> 8; | |
612 | manufacturer[1] = ret & 0xff; | |
613 | ||
614 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_DEVICE_ID); | |
615 | if (ret < 0) { | |
616 | dev_err(opt->dev, "failed to read register %02x\n", | |
617 | OPT3001_DEVICE_ID); | |
618 | return ret; | |
619 | } | |
620 | ||
621 | device_id = ret; | |
622 | ||
623 | dev_info(opt->dev, "Found %c%c OPT%04x\n", manufacturer[0], | |
624 | manufacturer[1], device_id); | |
625 | ||
626 | return 0; | |
627 | } | |
628 | ||
629 | static int opt3001_configure(struct opt3001 *opt) | |
630 | { | |
631 | int ret; | |
632 | u16 reg; | |
633 | ||
634 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_CONFIGURATION); | |
635 | if (ret < 0) { | |
636 | dev_err(opt->dev, "failed to read register %02x\n", | |
637 | OPT3001_CONFIGURATION); | |
638 | return ret; | |
639 | } | |
640 | ||
641 | reg = ret; | |
642 | ||
643 | /* Enable automatic full-scale setting mode */ | |
644 | reg &= ~OPT3001_CONFIGURATION_RN_MASK; | |
645 | reg |= OPT3001_CONFIGURATION_RN_AUTO; | |
646 | ||
647 | /* Reflect status of the device's integration time setting */ | |
648 | if (reg & OPT3001_CONFIGURATION_CT) | |
564cff82 | 649 | opt->int_time = OPT3001_INT_TIME_LONG; |
94a9b7b1 | 650 | else |
564cff82 | 651 | opt->int_time = OPT3001_INT_TIME_SHORT; |
94a9b7b1 AD |
652 | |
653 | /* Ensure device is in shutdown initially */ | |
654 | opt3001_set_mode(opt, ®, OPT3001_CONFIGURATION_M_SHUTDOWN); | |
655 | ||
656 | /* Configure for latched window-style comparison operation */ | |
657 | reg |= OPT3001_CONFIGURATION_L; | |
658 | reg &= ~OPT3001_CONFIGURATION_POL; | |
659 | reg &= ~OPT3001_CONFIGURATION_ME; | |
660 | reg &= ~OPT3001_CONFIGURATION_FC_MASK; | |
661 | ||
662 | ret = i2c_smbus_write_word_swapped(opt->client, OPT3001_CONFIGURATION, | |
663 | reg); | |
664 | if (ret < 0) { | |
665 | dev_err(opt->dev, "failed to write register %02x\n", | |
666 | OPT3001_CONFIGURATION); | |
667 | return ret; | |
668 | } | |
669 | ||
670 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_LOW_LIMIT); | |
671 | if (ret < 0) { | |
672 | dev_err(opt->dev, "failed to read register %02x\n", | |
673 | OPT3001_LOW_LIMIT); | |
674 | return ret; | |
675 | } | |
676 | ||
677 | opt->low_thresh_mantissa = OPT3001_REG_MANTISSA(ret); | |
678 | opt->low_thresh_exp = OPT3001_REG_EXPONENT(ret); | |
679 | ||
680 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_HIGH_LIMIT); | |
681 | if (ret < 0) { | |
682 | dev_err(opt->dev, "failed to read register %02x\n", | |
683 | OPT3001_HIGH_LIMIT); | |
684 | return ret; | |
685 | } | |
686 | ||
687 | opt->high_thresh_mantissa = OPT3001_REG_MANTISSA(ret); | |
688 | opt->high_thresh_exp = OPT3001_REG_EXPONENT(ret); | |
689 | ||
690 | return 0; | |
691 | } | |
692 | ||
693 | static irqreturn_t opt3001_irq(int irq, void *_iio) | |
694 | { | |
695 | struct iio_dev *iio = _iio; | |
696 | struct opt3001 *opt = iio_priv(iio); | |
697 | int ret; | |
698 | ||
699 | if (!opt->ok_to_ignore_lock) | |
700 | mutex_lock(&opt->lock); | |
701 | ||
702 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_CONFIGURATION); | |
703 | if (ret < 0) { | |
704 | dev_err(opt->dev, "failed to read register %02x\n", | |
705 | OPT3001_CONFIGURATION); | |
706 | goto out; | |
707 | } | |
708 | ||
709 | if ((ret & OPT3001_CONFIGURATION_M_MASK) == | |
710 | OPT3001_CONFIGURATION_M_CONTINUOUS) { | |
711 | if (ret & OPT3001_CONFIGURATION_FH) | |
712 | iio_push_event(iio, | |
713 | IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0, | |
714 | IIO_EV_TYPE_THRESH, | |
715 | IIO_EV_DIR_RISING), | |
716 | iio_get_time_ns()); | |
717 | if (ret & OPT3001_CONFIGURATION_FL) | |
718 | iio_push_event(iio, | |
719 | IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0, | |
720 | IIO_EV_TYPE_THRESH, | |
721 | IIO_EV_DIR_FALLING), | |
722 | iio_get_time_ns()); | |
723 | } else if (ret & OPT3001_CONFIGURATION_CRF) { | |
724 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_RESULT); | |
725 | if (ret < 0) { | |
726 | dev_err(opt->dev, "failed to read register %02x\n", | |
727 | OPT3001_RESULT); | |
728 | goto out; | |
729 | } | |
730 | opt->result = ret; | |
731 | opt->result_ready = true; | |
732 | wake_up(&opt->result_ready_queue); | |
733 | } | |
734 | ||
735 | out: | |
736 | if (!opt->ok_to_ignore_lock) | |
737 | mutex_unlock(&opt->lock); | |
738 | ||
739 | return IRQ_HANDLED; | |
740 | } | |
741 | ||
742 | static int opt3001_probe(struct i2c_client *client, | |
743 | const struct i2c_device_id *id) | |
744 | { | |
745 | struct device *dev = &client->dev; | |
746 | ||
747 | struct iio_dev *iio; | |
748 | struct opt3001 *opt; | |
749 | int irq = client->irq; | |
750 | int ret; | |
751 | ||
752 | iio = devm_iio_device_alloc(dev, sizeof(*opt)); | |
753 | if (!iio) | |
754 | return -ENOMEM; | |
755 | ||
756 | opt = iio_priv(iio); | |
757 | opt->client = client; | |
758 | opt->dev = dev; | |
759 | ||
760 | mutex_init(&opt->lock); | |
761 | init_waitqueue_head(&opt->result_ready_queue); | |
762 | i2c_set_clientdata(client, iio); | |
763 | ||
764 | ret = opt3001_read_id(opt); | |
765 | if (ret) | |
766 | return ret; | |
767 | ||
768 | ret = opt3001_configure(opt); | |
769 | if (ret) | |
770 | return ret; | |
771 | ||
772 | iio->name = client->name; | |
773 | iio->channels = opt3001_channels; | |
774 | iio->num_channels = ARRAY_SIZE(opt3001_channels); | |
775 | iio->dev.parent = dev; | |
776 | iio->modes = INDIO_DIRECT_MODE; | |
777 | iio->info = &opt3001_info; | |
778 | ||
779 | ret = devm_iio_device_register(dev, iio); | |
780 | if (ret) { | |
781 | dev_err(dev, "failed to register IIO device\n"); | |
782 | return ret; | |
783 | } | |
784 | ||
ac663db3 AK |
785 | /* Make use of INT pin only if valid IRQ no. is given */ |
786 | if (irq > 0) { | |
787 | ret = request_threaded_irq(irq, NULL, opt3001_irq, | |
788 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
789 | "opt3001", iio); | |
790 | if (ret) { | |
791 | dev_err(dev, "failed to request IRQ #%d\n", irq); | |
792 | return ret; | |
793 | } | |
794 | opt->use_irq = true; | |
795 | } else { | |
796 | dev_dbg(opt->dev, "enabling interrupt-less operation\n"); | |
94a9b7b1 AD |
797 | } |
798 | ||
799 | return 0; | |
800 | } | |
801 | ||
802 | static int opt3001_remove(struct i2c_client *client) | |
803 | { | |
804 | struct iio_dev *iio = i2c_get_clientdata(client); | |
805 | struct opt3001 *opt = iio_priv(iio); | |
806 | int ret; | |
807 | u16 reg; | |
808 | ||
ac663db3 AK |
809 | if (opt->use_irq) |
810 | free_irq(client->irq, iio); | |
94a9b7b1 AD |
811 | |
812 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_CONFIGURATION); | |
813 | if (ret < 0) { | |
814 | dev_err(opt->dev, "failed to read register %02x\n", | |
815 | OPT3001_CONFIGURATION); | |
816 | return ret; | |
817 | } | |
818 | ||
819 | reg = ret; | |
820 | opt3001_set_mode(opt, ®, OPT3001_CONFIGURATION_M_SHUTDOWN); | |
821 | ||
822 | ret = i2c_smbus_write_word_swapped(opt->client, OPT3001_CONFIGURATION, | |
823 | reg); | |
824 | if (ret < 0) { | |
825 | dev_err(opt->dev, "failed to write register %02x\n", | |
826 | OPT3001_CONFIGURATION); | |
827 | return ret; | |
828 | } | |
829 | ||
830 | return 0; | |
831 | } | |
832 | ||
833 | static const struct i2c_device_id opt3001_id[] = { | |
834 | { "opt3001", 0 }, | |
835 | { } /* Terminating Entry */ | |
836 | }; | |
837 | MODULE_DEVICE_TABLE(i2c, opt3001_id); | |
838 | ||
839 | static const struct of_device_id opt3001_of_match[] = { | |
840 | { .compatible = "ti,opt3001" }, | |
841 | { } | |
842 | }; | |
843 | ||
844 | static struct i2c_driver opt3001_driver = { | |
845 | .probe = opt3001_probe, | |
846 | .remove = opt3001_remove, | |
847 | .id_table = opt3001_id, | |
848 | ||
849 | .driver = { | |
850 | .name = "opt3001", | |
851 | .of_match_table = of_match_ptr(opt3001_of_match), | |
94a9b7b1 AD |
852 | }, |
853 | }; | |
854 | ||
855 | module_i2c_driver(opt3001_driver); | |
856 | ||
857 | MODULE_LICENSE("GPL v2"); | |
858 | MODULE_AUTHOR("Andreas Dannenberg <dannenberg@ti.com>"); | |
859 | MODULE_DESCRIPTION("Texas Instruments OPT3001 Light Sensor Driver"); |