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9c8ea1b2 JH |
1 | /* |
2 | * lm3533-als.c -- LM3533 Ambient Light Sensor driver | |
3 | * | |
4 | * Copyright (C) 2011-2012 Texas Instruments | |
5 | * | |
6 | * Author: Johan Hovold <jhovold@gmail.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2 of the License, or (at your | |
11 | * option) any later version. | |
12 | */ | |
13 | ||
14 | #include <linux/atomic.h> | |
15 | #include <linux/fs.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/io.h> | |
18 | #include <linux/iio/events.h> | |
19 | #include <linux/iio/iio.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/mutex.h> | |
22 | #include <linux/mfd/core.h> | |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/uaccess.h> | |
26 | ||
27 | #include <linux/mfd/lm3533.h> | |
28 | ||
29 | ||
30 | #define LM3533_ALS_RESISTOR_MIN 1 | |
31 | #define LM3533_ALS_RESISTOR_MAX 127 | |
32 | #define LM3533_ALS_CHANNEL_CURRENT_MAX 2 | |
33 | #define LM3533_ALS_THRESH_MAX 3 | |
34 | #define LM3533_ALS_ZONE_MAX 4 | |
35 | ||
36 | #define LM3533_REG_ALS_RESISTOR_SELECT 0x30 | |
37 | #define LM3533_REG_ALS_CONF 0x31 | |
38 | #define LM3533_REG_ALS_ZONE_INFO 0x34 | |
39 | #define LM3533_REG_ALS_READ_ADC_RAW 0x37 | |
40 | #define LM3533_REG_ALS_READ_ADC_AVERAGE 0x38 | |
41 | #define LM3533_REG_ALS_BOUNDARY_BASE 0x50 | |
42 | #define LM3533_REG_ALS_TARGET_BASE 0x60 | |
43 | ||
44 | #define LM3533_ALS_ENABLE_MASK 0x01 | |
45 | #define LM3533_ALS_INPUT_MODE_MASK 0x02 | |
46 | #define LM3533_ALS_INT_ENABLE_MASK 0x01 | |
47 | ||
48 | #define LM3533_ALS_ZONE_SHIFT 2 | |
49 | #define LM3533_ALS_ZONE_MASK 0x1c | |
50 | ||
51 | #define LM3533_ALS_FLAG_INT_ENABLED 1 | |
52 | ||
53 | ||
54 | struct lm3533_als { | |
55 | struct lm3533 *lm3533; | |
56 | struct platform_device *pdev; | |
57 | ||
58 | unsigned long flags; | |
59 | int irq; | |
60 | ||
61 | atomic_t zone; | |
62 | struct mutex thresh_mutex; | |
63 | }; | |
64 | ||
65 | ||
66 | static int lm3533_als_get_adc(struct iio_dev *indio_dev, bool average, | |
67 | int *adc) | |
68 | { | |
69 | struct lm3533_als *als = iio_priv(indio_dev); | |
70 | u8 reg; | |
71 | u8 val; | |
72 | int ret; | |
73 | ||
74 | if (average) | |
75 | reg = LM3533_REG_ALS_READ_ADC_AVERAGE; | |
76 | else | |
77 | reg = LM3533_REG_ALS_READ_ADC_RAW; | |
78 | ||
79 | ret = lm3533_read(als->lm3533, reg, &val); | |
80 | if (ret) { | |
81 | dev_err(&indio_dev->dev, "failed to read adc\n"); | |
82 | return ret; | |
83 | } | |
84 | ||
85 | *adc = val; | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
90 | static int _lm3533_als_get_zone(struct iio_dev *indio_dev, u8 *zone) | |
91 | { | |
92 | struct lm3533_als *als = iio_priv(indio_dev); | |
93 | u8 val; | |
94 | int ret; | |
95 | ||
96 | ret = lm3533_read(als->lm3533, LM3533_REG_ALS_ZONE_INFO, &val); | |
97 | if (ret) { | |
98 | dev_err(&indio_dev->dev, "failed to read zone\n"); | |
99 | return ret; | |
100 | } | |
101 | ||
102 | val = (val & LM3533_ALS_ZONE_MASK) >> LM3533_ALS_ZONE_SHIFT; | |
103 | *zone = min_t(u8, val, LM3533_ALS_ZONE_MAX); | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
108 | static int lm3533_als_get_zone(struct iio_dev *indio_dev, u8 *zone) | |
109 | { | |
110 | struct lm3533_als *als = iio_priv(indio_dev); | |
111 | int ret; | |
112 | ||
113 | if (test_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags)) { | |
114 | *zone = atomic_read(&als->zone); | |
115 | } else { | |
116 | ret = _lm3533_als_get_zone(indio_dev, zone); | |
117 | if (ret) | |
118 | return ret; | |
119 | } | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
124 | /* | |
125 | * channel output channel 0..2 | |
126 | * zone zone 0..4 | |
127 | */ | |
128 | static inline u8 lm3533_als_get_target_reg(unsigned channel, unsigned zone) | |
129 | { | |
130 | return LM3533_REG_ALS_TARGET_BASE + 5 * channel + zone; | |
131 | } | |
132 | ||
133 | static int lm3533_als_get_target(struct iio_dev *indio_dev, unsigned channel, | |
134 | unsigned zone, u8 *val) | |
135 | { | |
136 | struct lm3533_als *als = iio_priv(indio_dev); | |
137 | u8 reg; | |
138 | int ret; | |
139 | ||
140 | if (channel > LM3533_ALS_CHANNEL_CURRENT_MAX) | |
141 | return -EINVAL; | |
142 | ||
143 | if (zone > LM3533_ALS_ZONE_MAX) | |
144 | return -EINVAL; | |
145 | ||
146 | reg = lm3533_als_get_target_reg(channel, zone); | |
147 | ret = lm3533_read(als->lm3533, reg, val); | |
148 | if (ret) | |
149 | dev_err(&indio_dev->dev, "failed to get target current\n"); | |
150 | ||
151 | return ret; | |
152 | } | |
153 | ||
154 | static int lm3533_als_set_target(struct iio_dev *indio_dev, unsigned channel, | |
155 | unsigned zone, u8 val) | |
156 | { | |
157 | struct lm3533_als *als = iio_priv(indio_dev); | |
158 | u8 reg; | |
159 | int ret; | |
160 | ||
161 | if (channel > LM3533_ALS_CHANNEL_CURRENT_MAX) | |
162 | return -EINVAL; | |
163 | ||
164 | if (zone > LM3533_ALS_ZONE_MAX) | |
165 | return -EINVAL; | |
166 | ||
167 | reg = lm3533_als_get_target_reg(channel, zone); | |
168 | ret = lm3533_write(als->lm3533, reg, val); | |
169 | if (ret) | |
170 | dev_err(&indio_dev->dev, "failed to set target current\n"); | |
171 | ||
172 | return ret; | |
173 | } | |
174 | ||
175 | static int lm3533_als_get_current(struct iio_dev *indio_dev, unsigned channel, | |
176 | int *val) | |
177 | { | |
178 | u8 zone; | |
179 | u8 target; | |
180 | int ret; | |
181 | ||
182 | ret = lm3533_als_get_zone(indio_dev, &zone); | |
183 | if (ret) | |
184 | return ret; | |
185 | ||
186 | ret = lm3533_als_get_target(indio_dev, channel, zone, &target); | |
187 | if (ret) | |
188 | return ret; | |
189 | ||
190 | *val = target; | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
195 | static int lm3533_als_read_raw(struct iio_dev *indio_dev, | |
196 | struct iio_chan_spec const *chan, | |
197 | int *val, int *val2, long mask) | |
198 | { | |
199 | int ret; | |
200 | ||
201 | switch (mask) { | |
202 | case 0: | |
203 | switch (chan->type) { | |
204 | case IIO_LIGHT: | |
205 | ret = lm3533_als_get_adc(indio_dev, false, val); | |
206 | break; | |
207 | case IIO_CURRENT: | |
208 | ret = lm3533_als_get_current(indio_dev, chan->channel, | |
209 | val); | |
210 | break; | |
211 | default: | |
212 | return -EINVAL; | |
213 | } | |
214 | break; | |
215 | case IIO_CHAN_INFO_AVERAGE_RAW: | |
216 | ret = lm3533_als_get_adc(indio_dev, true, val); | |
217 | break; | |
218 | default: | |
219 | return -EINVAL; | |
220 | } | |
221 | ||
222 | if (ret) | |
223 | return ret; | |
224 | ||
225 | return IIO_VAL_INT; | |
226 | } | |
227 | ||
228 | #define CHANNEL_CURRENT(_channel) \ | |
229 | { \ | |
230 | .type = IIO_CURRENT, \ | |
231 | .channel = _channel, \ | |
232 | .indexed = true, \ | |
233 | .output = true, \ | |
234 | .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT, \ | |
235 | } | |
236 | ||
237 | static const struct iio_chan_spec lm3533_als_channels[] = { | |
238 | { | |
239 | .type = IIO_LIGHT, | |
240 | .channel = 0, | |
241 | .indexed = true, | |
242 | .info_mask = (IIO_CHAN_INFO_AVERAGE_RAW_SEPARATE_BIT | | |
243 | IIO_CHAN_INFO_RAW_SEPARATE_BIT), | |
244 | }, | |
245 | CHANNEL_CURRENT(0), | |
246 | CHANNEL_CURRENT(1), | |
247 | CHANNEL_CURRENT(2), | |
248 | }; | |
249 | ||
250 | static irqreturn_t lm3533_als_isr(int irq, void *dev_id) | |
251 | { | |
252 | ||
253 | struct iio_dev *indio_dev = dev_id; | |
254 | struct lm3533_als *als = iio_priv(indio_dev); | |
255 | u8 zone; | |
256 | int ret; | |
257 | ||
258 | /* Clear interrupt by reading the ALS zone register. */ | |
259 | ret = _lm3533_als_get_zone(indio_dev, &zone); | |
260 | if (ret) | |
261 | goto out; | |
262 | ||
263 | atomic_set(&als->zone, zone); | |
264 | ||
265 | iio_push_event(indio_dev, | |
266 | IIO_UNMOD_EVENT_CODE(IIO_LIGHT, | |
267 | 0, | |
268 | IIO_EV_TYPE_THRESH, | |
269 | IIO_EV_DIR_EITHER), | |
270 | iio_get_time_ns()); | |
271 | out: | |
272 | return IRQ_HANDLED; | |
273 | } | |
274 | ||
275 | static int lm3533_als_set_int_mode(struct iio_dev *indio_dev, int enable) | |
276 | { | |
277 | struct lm3533_als *als = iio_priv(indio_dev); | |
278 | u8 mask = LM3533_ALS_INT_ENABLE_MASK; | |
279 | u8 val; | |
280 | int ret; | |
281 | ||
282 | if (enable) | |
283 | val = mask; | |
284 | else | |
285 | val = 0; | |
286 | ||
287 | ret = lm3533_update(als->lm3533, LM3533_REG_ALS_ZONE_INFO, val, mask); | |
288 | if (ret) { | |
289 | dev_err(&indio_dev->dev, "failed to set int mode %d\n", | |
290 | enable); | |
291 | return ret; | |
292 | } | |
293 | ||
294 | return 0; | |
295 | } | |
296 | ||
297 | static int lm3533_als_get_int_mode(struct iio_dev *indio_dev, int *enable) | |
298 | { | |
299 | struct lm3533_als *als = iio_priv(indio_dev); | |
300 | u8 mask = LM3533_ALS_INT_ENABLE_MASK; | |
301 | u8 val; | |
302 | int ret; | |
303 | ||
304 | ret = lm3533_read(als->lm3533, LM3533_REG_ALS_ZONE_INFO, &val); | |
305 | if (ret) { | |
306 | dev_err(&indio_dev->dev, "failed to get int mode\n"); | |
307 | return ret; | |
308 | } | |
309 | ||
310 | *enable = !!(val & mask); | |
311 | ||
312 | return 0; | |
313 | } | |
314 | ||
315 | static inline u8 lm3533_als_get_threshold_reg(unsigned nr, bool raising) | |
316 | { | |
317 | u8 offset = !raising; | |
318 | ||
319 | return LM3533_REG_ALS_BOUNDARY_BASE + 2 * nr + offset; | |
320 | } | |
321 | ||
322 | static int lm3533_als_get_threshold(struct iio_dev *indio_dev, unsigned nr, | |
323 | bool raising, u8 *val) | |
324 | { | |
325 | struct lm3533_als *als = iio_priv(indio_dev); | |
326 | u8 reg; | |
327 | int ret; | |
328 | ||
329 | if (nr > LM3533_ALS_THRESH_MAX) | |
330 | return -EINVAL; | |
331 | ||
332 | reg = lm3533_als_get_threshold_reg(nr, raising); | |
333 | ret = lm3533_read(als->lm3533, reg, val); | |
334 | if (ret) | |
335 | dev_err(&indio_dev->dev, "failed to get threshold\n"); | |
336 | ||
337 | return ret; | |
338 | } | |
339 | ||
340 | static int lm3533_als_set_threshold(struct iio_dev *indio_dev, unsigned nr, | |
341 | bool raising, u8 val) | |
342 | { | |
343 | struct lm3533_als *als = iio_priv(indio_dev); | |
344 | u8 val2; | |
345 | u8 reg, reg2; | |
346 | int ret; | |
347 | ||
348 | if (nr > LM3533_ALS_THRESH_MAX) | |
349 | return -EINVAL; | |
350 | ||
351 | reg = lm3533_als_get_threshold_reg(nr, raising); | |
352 | reg2 = lm3533_als_get_threshold_reg(nr, !raising); | |
353 | ||
354 | mutex_lock(&als->thresh_mutex); | |
355 | ret = lm3533_read(als->lm3533, reg2, &val2); | |
356 | if (ret) { | |
357 | dev_err(&indio_dev->dev, "failed to get threshold\n"); | |
358 | goto out; | |
359 | } | |
360 | /* | |
361 | * This device does not allow negative hysteresis (in fact, it uses | |
362 | * whichever value is smaller as the lower bound) so we need to make | |
363 | * sure that thresh_falling <= thresh_raising. | |
364 | */ | |
365 | if ((raising && (val < val2)) || (!raising && (val > val2))) { | |
366 | ret = -EINVAL; | |
367 | goto out; | |
368 | } | |
369 | ||
370 | ret = lm3533_write(als->lm3533, reg, val); | |
371 | if (ret) { | |
372 | dev_err(&indio_dev->dev, "failed to set threshold\n"); | |
373 | goto out; | |
374 | } | |
375 | out: | |
376 | mutex_unlock(&als->thresh_mutex); | |
377 | ||
378 | return ret; | |
379 | } | |
380 | ||
381 | static int lm3533_als_get_hysteresis(struct iio_dev *indio_dev, unsigned nr, | |
382 | u8 *val) | |
383 | { | |
384 | struct lm3533_als *als = iio_priv(indio_dev); | |
385 | u8 falling; | |
386 | u8 raising; | |
387 | int ret; | |
388 | ||
389 | if (nr > LM3533_ALS_THRESH_MAX) | |
390 | return -EINVAL; | |
391 | ||
392 | mutex_lock(&als->thresh_mutex); | |
393 | ret = lm3533_als_get_threshold(indio_dev, nr, false, &falling); | |
394 | if (ret) | |
395 | goto out; | |
396 | ret = lm3533_als_get_threshold(indio_dev, nr, true, &raising); | |
397 | if (ret) | |
398 | goto out; | |
399 | ||
400 | *val = raising - falling; | |
401 | out: | |
402 | mutex_unlock(&als->thresh_mutex); | |
403 | ||
404 | return ret; | |
405 | } | |
406 | ||
407 | static int show_thresh_either_en(struct device *dev, | |
408 | struct device_attribute *attr, | |
409 | char *buf) | |
410 | { | |
411 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
412 | struct lm3533_als *als = iio_priv(indio_dev); | |
413 | int enable; | |
414 | int ret; | |
415 | ||
416 | if (als->irq) { | |
417 | ret = lm3533_als_get_int_mode(indio_dev, &enable); | |
418 | if (ret) | |
419 | return ret; | |
420 | } else { | |
421 | enable = 0; | |
422 | } | |
423 | ||
424 | return scnprintf(buf, PAGE_SIZE, "%u\n", enable); | |
425 | } | |
426 | ||
427 | static int store_thresh_either_en(struct device *dev, | |
428 | struct device_attribute *attr, | |
429 | const char *buf, size_t len) | |
430 | { | |
431 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
432 | struct lm3533_als *als = iio_priv(indio_dev); | |
433 | unsigned long enable; | |
434 | bool int_enabled; | |
435 | u8 zone; | |
436 | int ret; | |
437 | ||
438 | if (!als->irq) | |
439 | return -EBUSY; | |
440 | ||
441 | if (kstrtoul(buf, 0, &enable)) | |
442 | return -EINVAL; | |
443 | ||
444 | int_enabled = test_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags); | |
445 | ||
446 | if (enable && !int_enabled) { | |
447 | ret = lm3533_als_get_zone(indio_dev, &zone); | |
448 | if (ret) | |
449 | return ret; | |
450 | ||
451 | atomic_set(&als->zone, zone); | |
452 | ||
453 | set_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags); | |
454 | } | |
455 | ||
456 | ret = lm3533_als_set_int_mode(indio_dev, enable); | |
457 | if (ret) { | |
458 | if (!int_enabled) | |
459 | clear_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags); | |
460 | ||
461 | return ret; | |
462 | } | |
463 | ||
464 | if (!enable) | |
465 | clear_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags); | |
466 | ||
467 | return len; | |
468 | } | |
469 | ||
470 | static ssize_t show_zone(struct device *dev, | |
471 | struct device_attribute *attr, char *buf) | |
472 | { | |
473 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
474 | u8 zone; | |
475 | int ret; | |
476 | ||
477 | ret = lm3533_als_get_zone(indio_dev, &zone); | |
478 | if (ret) | |
479 | return ret; | |
480 | ||
481 | return scnprintf(buf, PAGE_SIZE, "%u\n", zone); | |
482 | } | |
483 | ||
484 | enum lm3533_als_attribute_type { | |
485 | LM3533_ATTR_TYPE_HYSTERESIS, | |
486 | LM3533_ATTR_TYPE_TARGET, | |
487 | LM3533_ATTR_TYPE_THRESH_FALLING, | |
488 | LM3533_ATTR_TYPE_THRESH_RAISING, | |
489 | }; | |
490 | ||
491 | struct lm3533_als_attribute { | |
492 | struct device_attribute dev_attr; | |
493 | enum lm3533_als_attribute_type type; | |
494 | u8 val1; | |
495 | u8 val2; | |
496 | }; | |
497 | ||
498 | static inline struct lm3533_als_attribute * | |
499 | to_lm3533_als_attr(struct device_attribute *attr) | |
500 | { | |
501 | return container_of(attr, struct lm3533_als_attribute, dev_attr); | |
502 | } | |
503 | ||
504 | static ssize_t show_als_attr(struct device *dev, | |
505 | struct device_attribute *attr, | |
506 | char *buf) | |
507 | { | |
508 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
509 | struct lm3533_als_attribute *als_attr = to_lm3533_als_attr(attr); | |
510 | u8 val; | |
511 | int ret; | |
512 | ||
513 | switch (als_attr->type) { | |
514 | case LM3533_ATTR_TYPE_HYSTERESIS: | |
515 | ret = lm3533_als_get_hysteresis(indio_dev, als_attr->val1, | |
516 | &val); | |
517 | break; | |
518 | case LM3533_ATTR_TYPE_TARGET: | |
519 | ret = lm3533_als_get_target(indio_dev, als_attr->val1, | |
520 | als_attr->val2, &val); | |
521 | break; | |
522 | case LM3533_ATTR_TYPE_THRESH_FALLING: | |
523 | ret = lm3533_als_get_threshold(indio_dev, als_attr->val1, | |
524 | false, &val); | |
525 | break; | |
526 | case LM3533_ATTR_TYPE_THRESH_RAISING: | |
527 | ret = lm3533_als_get_threshold(indio_dev, als_attr->val1, | |
528 | true, &val); | |
529 | break; | |
530 | default: | |
531 | ret = -ENXIO; | |
532 | } | |
533 | ||
534 | if (ret) | |
535 | return ret; | |
536 | ||
537 | return scnprintf(buf, PAGE_SIZE, "%u\n", val); | |
538 | } | |
539 | ||
540 | static ssize_t store_als_attr(struct device *dev, | |
541 | struct device_attribute *attr, | |
542 | const char *buf, size_t len) | |
543 | { | |
544 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
545 | struct lm3533_als_attribute *als_attr = to_lm3533_als_attr(attr); | |
546 | u8 val; | |
547 | int ret; | |
548 | ||
549 | if (kstrtou8(buf, 0, &val)) | |
550 | return -EINVAL; | |
551 | ||
552 | switch (als_attr->type) { | |
553 | case LM3533_ATTR_TYPE_TARGET: | |
554 | ret = lm3533_als_set_target(indio_dev, als_attr->val1, | |
555 | als_attr->val2, val); | |
556 | break; | |
557 | case LM3533_ATTR_TYPE_THRESH_FALLING: | |
558 | ret = lm3533_als_set_threshold(indio_dev, als_attr->val1, | |
559 | false, val); | |
560 | break; | |
561 | case LM3533_ATTR_TYPE_THRESH_RAISING: | |
562 | ret = lm3533_als_set_threshold(indio_dev, als_attr->val1, | |
563 | true, val); | |
564 | break; | |
565 | default: | |
566 | ret = -ENXIO; | |
567 | } | |
568 | ||
569 | if (ret) | |
570 | return ret; | |
571 | ||
572 | return len; | |
573 | } | |
574 | ||
575 | #define ALS_ATTR(_name, _mode, _show, _store, _type, _val1, _val2) \ | |
576 | { .dev_attr = __ATTR(_name, _mode, _show, _store), \ | |
577 | .type = _type, \ | |
578 | .val1 = _val1, \ | |
579 | .val2 = _val2 } | |
580 | ||
581 | #define LM3533_ALS_ATTR(_name, _mode, _show, _store, _type, _val1, _val2) \ | |
582 | struct lm3533_als_attribute lm3533_als_attr_##_name = \ | |
583 | ALS_ATTR(_name, _mode, _show, _store, _type, _val1, _val2) | |
584 | ||
585 | #define ALS_TARGET_ATTR_RW(_channel, _zone) \ | |
586 | LM3533_ALS_ATTR(out_current##_channel##_current##_zone##_raw, \ | |
587 | S_IRUGO | S_IWUSR, \ | |
588 | show_als_attr, store_als_attr, \ | |
589 | LM3533_ATTR_TYPE_TARGET, _channel, _zone) | |
590 | /* | |
591 | * ALS output current values (ALS mapper targets) | |
592 | * | |
593 | * out_current[0-2]_current[0-4]_raw 0-255 | |
594 | */ | |
595 | static ALS_TARGET_ATTR_RW(0, 0); | |
596 | static ALS_TARGET_ATTR_RW(0, 1); | |
597 | static ALS_TARGET_ATTR_RW(0, 2); | |
598 | static ALS_TARGET_ATTR_RW(0, 3); | |
599 | static ALS_TARGET_ATTR_RW(0, 4); | |
600 | ||
601 | static ALS_TARGET_ATTR_RW(1, 0); | |
602 | static ALS_TARGET_ATTR_RW(1, 1); | |
603 | static ALS_TARGET_ATTR_RW(1, 2); | |
604 | static ALS_TARGET_ATTR_RW(1, 3); | |
605 | static ALS_TARGET_ATTR_RW(1, 4); | |
606 | ||
607 | static ALS_TARGET_ATTR_RW(2, 0); | |
608 | static ALS_TARGET_ATTR_RW(2, 1); | |
609 | static ALS_TARGET_ATTR_RW(2, 2); | |
610 | static ALS_TARGET_ATTR_RW(2, 3); | |
611 | static ALS_TARGET_ATTR_RW(2, 4); | |
612 | ||
613 | #define ALS_THRESH_FALLING_ATTR_RW(_nr) \ | |
614 | LM3533_ALS_ATTR(in_illuminance0_thresh##_nr##_falling_value, \ | |
615 | S_IRUGO | S_IWUSR, \ | |
616 | show_als_attr, store_als_attr, \ | |
617 | LM3533_ATTR_TYPE_THRESH_FALLING, _nr, 0) | |
618 | ||
619 | #define ALS_THRESH_RAISING_ATTR_RW(_nr) \ | |
620 | LM3533_ALS_ATTR(in_illuminance0_thresh##_nr##_raising_value, \ | |
621 | S_IRUGO | S_IWUSR, \ | |
622 | show_als_attr, store_als_attr, \ | |
623 | LM3533_ATTR_TYPE_THRESH_RAISING, _nr, 0) | |
624 | /* | |
625 | * ALS Zone thresholds (boundaries) | |
626 | * | |
627 | * in_illuminance0_thresh[0-3]_falling_value 0-255 | |
628 | * in_illuminance0_thresh[0-3]_raising_value 0-255 | |
629 | */ | |
630 | static ALS_THRESH_FALLING_ATTR_RW(0); | |
631 | static ALS_THRESH_FALLING_ATTR_RW(1); | |
632 | static ALS_THRESH_FALLING_ATTR_RW(2); | |
633 | static ALS_THRESH_FALLING_ATTR_RW(3); | |
634 | ||
635 | static ALS_THRESH_RAISING_ATTR_RW(0); | |
636 | static ALS_THRESH_RAISING_ATTR_RW(1); | |
637 | static ALS_THRESH_RAISING_ATTR_RW(2); | |
638 | static ALS_THRESH_RAISING_ATTR_RW(3); | |
639 | ||
640 | #define ALS_HYSTERESIS_ATTR_RO(_nr) \ | |
641 | LM3533_ALS_ATTR(in_illuminance0_thresh##_nr##_hysteresis, \ | |
642 | S_IRUGO, show_als_attr, NULL, \ | |
643 | LM3533_ATTR_TYPE_HYSTERESIS, _nr, 0) | |
644 | /* | |
645 | * ALS Zone threshold hysteresis | |
646 | * | |
647 | * threshY_hysteresis = threshY_raising - threshY_falling | |
648 | * | |
649 | * in_illuminance0_thresh[0-3]_hysteresis 0-255 | |
650 | * in_illuminance0_thresh[0-3]_hysteresis 0-255 | |
651 | */ | |
652 | static ALS_HYSTERESIS_ATTR_RO(0); | |
653 | static ALS_HYSTERESIS_ATTR_RO(1); | |
654 | static ALS_HYSTERESIS_ATTR_RO(2); | |
655 | static ALS_HYSTERESIS_ATTR_RO(3); | |
656 | ||
657 | #define ILLUMINANCE_ATTR_RO(_name) \ | |
658 | DEVICE_ATTR(in_illuminance0_##_name, S_IRUGO, show_##_name, NULL) | |
659 | #define ILLUMINANCE_ATTR_RW(_name) \ | |
660 | DEVICE_ATTR(in_illuminance0_##_name, S_IRUGO | S_IWUSR , \ | |
661 | show_##_name, store_##_name) | |
662 | /* | |
663 | * ALS Zone threshold-event enable | |
664 | * | |
665 | * in_illuminance0_thresh_either_en 0,1 | |
666 | */ | |
667 | static ILLUMINANCE_ATTR_RW(thresh_either_en); | |
668 | ||
669 | /* | |
670 | * ALS Current Zone | |
671 | * | |
672 | * in_illuminance0_zone 0-4 | |
673 | */ | |
674 | static ILLUMINANCE_ATTR_RO(zone); | |
675 | ||
676 | static struct attribute *lm3533_als_event_attributes[] = { | |
677 | &dev_attr_in_illuminance0_thresh_either_en.attr, | |
678 | &lm3533_als_attr_in_illuminance0_thresh0_falling_value.dev_attr.attr, | |
679 | &lm3533_als_attr_in_illuminance0_thresh0_hysteresis.dev_attr.attr, | |
680 | &lm3533_als_attr_in_illuminance0_thresh0_raising_value.dev_attr.attr, | |
681 | &lm3533_als_attr_in_illuminance0_thresh1_falling_value.dev_attr.attr, | |
682 | &lm3533_als_attr_in_illuminance0_thresh1_hysteresis.dev_attr.attr, | |
683 | &lm3533_als_attr_in_illuminance0_thresh1_raising_value.dev_attr.attr, | |
684 | &lm3533_als_attr_in_illuminance0_thresh2_falling_value.dev_attr.attr, | |
685 | &lm3533_als_attr_in_illuminance0_thresh2_hysteresis.dev_attr.attr, | |
686 | &lm3533_als_attr_in_illuminance0_thresh2_raising_value.dev_attr.attr, | |
687 | &lm3533_als_attr_in_illuminance0_thresh3_falling_value.dev_attr.attr, | |
688 | &lm3533_als_attr_in_illuminance0_thresh3_hysteresis.dev_attr.attr, | |
689 | &lm3533_als_attr_in_illuminance0_thresh3_raising_value.dev_attr.attr, | |
690 | NULL | |
691 | }; | |
692 | ||
693 | static struct attribute_group lm3533_als_event_attribute_group = { | |
694 | .attrs = lm3533_als_event_attributes | |
695 | }; | |
696 | ||
697 | static struct attribute *lm3533_als_attributes[] = { | |
698 | &dev_attr_in_illuminance0_zone.attr, | |
699 | &lm3533_als_attr_out_current0_current0_raw.dev_attr.attr, | |
700 | &lm3533_als_attr_out_current0_current1_raw.dev_attr.attr, | |
701 | &lm3533_als_attr_out_current0_current2_raw.dev_attr.attr, | |
702 | &lm3533_als_attr_out_current0_current3_raw.dev_attr.attr, | |
703 | &lm3533_als_attr_out_current0_current4_raw.dev_attr.attr, | |
704 | &lm3533_als_attr_out_current1_current0_raw.dev_attr.attr, | |
705 | &lm3533_als_attr_out_current1_current1_raw.dev_attr.attr, | |
706 | &lm3533_als_attr_out_current1_current2_raw.dev_attr.attr, | |
707 | &lm3533_als_attr_out_current1_current3_raw.dev_attr.attr, | |
708 | &lm3533_als_attr_out_current1_current4_raw.dev_attr.attr, | |
709 | &lm3533_als_attr_out_current2_current0_raw.dev_attr.attr, | |
710 | &lm3533_als_attr_out_current2_current1_raw.dev_attr.attr, | |
711 | &lm3533_als_attr_out_current2_current2_raw.dev_attr.attr, | |
712 | &lm3533_als_attr_out_current2_current3_raw.dev_attr.attr, | |
713 | &lm3533_als_attr_out_current2_current4_raw.dev_attr.attr, | |
714 | NULL | |
715 | }; | |
716 | ||
717 | static struct attribute_group lm3533_als_attribute_group = { | |
718 | .attrs = lm3533_als_attributes | |
719 | }; | |
720 | ||
721 | static int __devinit lm3533_als_set_input_mode(struct lm3533_als *als, | |
722 | bool pwm_mode) | |
723 | { | |
724 | u8 mask = LM3533_ALS_INPUT_MODE_MASK; | |
725 | u8 val; | |
726 | int ret; | |
727 | ||
728 | if (pwm_mode) | |
729 | val = mask; /* pwm input */ | |
730 | else | |
731 | val = 0; /* analog input */ | |
732 | ||
733 | ret = lm3533_update(als->lm3533, LM3533_REG_ALS_CONF, val, mask); | |
734 | if (ret) { | |
735 | dev_err(&als->pdev->dev, "failed to set input mode %d\n", | |
736 | pwm_mode); | |
737 | return ret; | |
738 | } | |
739 | ||
740 | return 0; | |
741 | } | |
742 | ||
743 | static int __devinit lm3533_als_set_resistor(struct lm3533_als *als, u8 val) | |
744 | { | |
745 | int ret; | |
746 | ||
747 | if (val < LM3533_ALS_RESISTOR_MIN || val > LM3533_ALS_RESISTOR_MAX) | |
748 | return -EINVAL; | |
749 | ||
750 | ret = lm3533_write(als->lm3533, LM3533_REG_ALS_RESISTOR_SELECT, val); | |
751 | if (ret) { | |
752 | dev_err(&als->pdev->dev, "failed to set resistor\n"); | |
753 | return ret; | |
754 | } | |
755 | ||
756 | return 0; | |
757 | } | |
758 | ||
759 | static int __devinit lm3533_als_setup(struct lm3533_als *als, | |
760 | struct lm3533_als_platform_data *pdata) | |
761 | { | |
762 | int ret; | |
763 | ||
764 | ret = lm3533_als_set_input_mode(als, pdata->pwm_mode); | |
765 | if (ret) | |
766 | return ret; | |
767 | ||
768 | /* ALS input is always high impedance in PWM-mode. */ | |
769 | if (!pdata->pwm_mode) { | |
770 | ret = lm3533_als_set_resistor(als, pdata->r_select); | |
771 | if (ret) | |
772 | return ret; | |
773 | } | |
774 | ||
775 | return 0; | |
776 | } | |
777 | ||
778 | static int __devinit lm3533_als_setup_irq(struct lm3533_als *als, void *dev) | |
779 | { | |
780 | u8 mask = LM3533_ALS_INT_ENABLE_MASK; | |
781 | int ret; | |
782 | ||
783 | /* Make sure interrupts are disabled. */ | |
784 | ret = lm3533_update(als->lm3533, LM3533_REG_ALS_ZONE_INFO, 0, mask); | |
785 | if (ret) { | |
786 | dev_err(&als->pdev->dev, "failed to disable interrupts\n"); | |
787 | return ret; | |
788 | } | |
789 | ||
790 | ret = request_threaded_irq(als->irq, NULL, lm3533_als_isr, | |
791 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, | |
792 | dev_name(&als->pdev->dev), dev); | |
793 | if (ret) { | |
794 | dev_err(&als->pdev->dev, "failed to request irq %d\n", | |
795 | als->irq); | |
796 | return ret; | |
797 | } | |
798 | ||
799 | return 0; | |
800 | } | |
801 | ||
802 | static int __devinit lm3533_als_enable(struct lm3533_als *als) | |
803 | { | |
804 | u8 mask = LM3533_ALS_ENABLE_MASK; | |
805 | int ret; | |
806 | ||
807 | ret = lm3533_update(als->lm3533, LM3533_REG_ALS_CONF, mask, mask); | |
808 | if (ret) | |
809 | dev_err(&als->pdev->dev, "failed to enable ALS\n"); | |
810 | ||
811 | return ret; | |
812 | } | |
813 | ||
814 | static int lm3533_als_disable(struct lm3533_als *als) | |
815 | { | |
816 | u8 mask = LM3533_ALS_ENABLE_MASK; | |
817 | int ret; | |
818 | ||
819 | ret = lm3533_update(als->lm3533, LM3533_REG_ALS_CONF, 0, mask); | |
820 | if (ret) | |
821 | dev_err(&als->pdev->dev, "failed to disable ALS\n"); | |
822 | ||
823 | return ret; | |
824 | } | |
825 | ||
826 | static const struct iio_info lm3533_als_info = { | |
827 | .attrs = &lm3533_als_attribute_group, | |
828 | .event_attrs = &lm3533_als_event_attribute_group, | |
829 | .driver_module = THIS_MODULE, | |
830 | .read_raw = &lm3533_als_read_raw, | |
831 | }; | |
832 | ||
833 | static int __devinit lm3533_als_probe(struct platform_device *pdev) | |
834 | { | |
835 | struct lm3533 *lm3533; | |
836 | struct lm3533_als_platform_data *pdata; | |
837 | struct lm3533_als *als; | |
838 | struct iio_dev *indio_dev; | |
839 | int ret; | |
840 | ||
841 | lm3533 = dev_get_drvdata(pdev->dev.parent); | |
842 | if (!lm3533) | |
843 | return -EINVAL; | |
844 | ||
845 | pdata = pdev->dev.platform_data; | |
846 | if (!pdata) { | |
847 | dev_err(&pdev->dev, "no platform data\n"); | |
848 | return -EINVAL; | |
849 | } | |
850 | ||
851 | indio_dev = iio_device_alloc(sizeof(*als)); | |
852 | if (!indio_dev) | |
853 | return -ENOMEM; | |
854 | ||
855 | indio_dev->info = &lm3533_als_info; | |
856 | indio_dev->channels = lm3533_als_channels; | |
857 | indio_dev->num_channels = ARRAY_SIZE(lm3533_als_channels); | |
858 | indio_dev->name = dev_name(&pdev->dev); | |
859 | indio_dev->dev.parent = pdev->dev.parent; | |
860 | indio_dev->modes = INDIO_DIRECT_MODE; | |
861 | ||
862 | als = iio_priv(indio_dev); | |
863 | als->lm3533 = lm3533; | |
864 | als->pdev = pdev; | |
865 | als->irq = lm3533->irq; | |
866 | atomic_set(&als->zone, 0); | |
867 | mutex_init(&als->thresh_mutex); | |
868 | ||
869 | platform_set_drvdata(pdev, indio_dev); | |
870 | ||
871 | if (als->irq) { | |
872 | ret = lm3533_als_setup_irq(als, indio_dev); | |
873 | if (ret) | |
874 | goto err_free_dev; | |
875 | } | |
876 | ||
877 | ret = lm3533_als_setup(als, pdata); | |
878 | if (ret) | |
879 | goto err_free_irq; | |
880 | ||
881 | ret = lm3533_als_enable(als); | |
882 | if (ret) | |
883 | goto err_free_irq; | |
884 | ||
885 | ret = iio_device_register(indio_dev); | |
886 | if (ret) { | |
887 | dev_err(&pdev->dev, "failed to register ALS\n"); | |
888 | goto err_disable; | |
889 | } | |
890 | ||
891 | return 0; | |
892 | ||
893 | err_disable: | |
894 | lm3533_als_disable(als); | |
895 | err_free_irq: | |
896 | if (als->irq) | |
897 | free_irq(als->irq, indio_dev); | |
898 | err_free_dev: | |
899 | iio_device_free(indio_dev); | |
900 | ||
901 | return ret; | |
902 | } | |
903 | ||
904 | static int __devexit lm3533_als_remove(struct platform_device *pdev) | |
905 | { | |
906 | struct iio_dev *indio_dev = platform_get_drvdata(pdev); | |
907 | struct lm3533_als *als = iio_priv(indio_dev); | |
908 | ||
909 | lm3533_als_set_int_mode(indio_dev, false); | |
910 | iio_device_unregister(indio_dev); | |
911 | lm3533_als_disable(als); | |
912 | if (als->irq) | |
913 | free_irq(als->irq, indio_dev); | |
914 | iio_device_free(indio_dev); | |
915 | ||
916 | return 0; | |
917 | } | |
918 | ||
919 | static struct platform_driver lm3533_als_driver = { | |
920 | .driver = { | |
921 | .name = "lm3533-als", | |
922 | .owner = THIS_MODULE, | |
923 | }, | |
924 | .probe = lm3533_als_probe, | |
925 | .remove = __devexit_p(lm3533_als_remove), | |
926 | }; | |
927 | module_platform_driver(lm3533_als_driver); | |
928 | ||
929 | MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>"); | |
930 | MODULE_DESCRIPTION("LM3533 Ambient Light Sensor driver"); | |
931 | MODULE_LICENSE("GPL"); | |
932 | MODULE_ALIAS("platform:lm3533-als"); |