1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * vl6180.c - Support for STMicroelectronics VL6180 ALS, range and proximity
4 * sensor
5 *
6 * Copyright 2017 Peter Meerwald-Stadler <pmeerw@pmeerw.net>
7 * Copyright 2017 Manivannan Sadhasivam <manivannanece23@gmail.com>
8 *
9 * IIO driver for VL6180 (7-bit I2C slave address 0x29)
10 *
11 * Range: 0 to 100mm
12 * ALS: < 1 Lux up to 100 kLux
13 * IR: 850nm
14 *
15 * TODO: irq, threshold events, continuous mode, hardware buffer
16 */
17
18 #include <linux/module.h>
19 #include <linux/i2c.h>
20 #include <linux/mutex.h>
21 #include <linux/err.h>
22 #include <linux/delay.h>
23 #include <linux/util_macros.h>
24
25 #include <linux/iio/iio.h>
26 #include <linux/iio/sysfs.h>
27 #include <linux/iio/buffer.h>
28 #include <linux/iio/trigger.h>
29 #include <linux/iio/trigger_consumer.h>
30 #include <linux/iio/triggered_buffer.h>
31
32 #define VL6180_DRV_NAME "vl6180"
33
34 /* Device identification register and value */
35 #define VL6180_MODEL_ID 0x000
36 #define VL6180_MODEL_ID_VAL 0xb4
37
38 /* Configuration registers */
39 #define VL6180_INTR_CONFIG 0x014
40 #define VL6180_INTR_CLEAR 0x015
41 #define VL6180_OUT_OF_RESET 0x016
42 #define VL6180_HOLD 0x017
43 #define VL6180_RANGE_START 0x018
44 #define VL6180_RANGE_INTER_MEAS_TIME 0x01b
45 #define VL6180_ALS_START 0x038
46 #define VL6180_ALS_INTER_MEAS_TIME 0x03e
47 #define VL6180_ALS_GAIN 0x03f
48 #define VL6180_ALS_IT 0x040
49
50 /* Status registers */
51 #define VL6180_RANGE_STATUS 0x04d
52 #define VL6180_ALS_STATUS 0x04e
53 #define VL6180_INTR_STATUS 0x04f
54
55 /* Result value registers */
56 #define VL6180_ALS_VALUE 0x050
57 #define VL6180_RANGE_VALUE 0x062
58 #define VL6180_RANGE_RATE 0x066
59
60 /* bits of the RANGE_START and ALS_START register */
61 #define VL6180_MODE_CONT BIT(1) /* continuous mode */
62 #define VL6180_STARTSTOP BIT(0) /* start measurement, auto-reset */
63
64 /* bits of the INTR_STATUS and INTR_CONFIG register */
65 #define VL6180_ALS_READY BIT(5)
66 #define VL6180_RANGE_READY BIT(2)
67
68 /* bits of the INTR_CLEAR register */
69 #define VL6180_CLEAR_ERROR BIT(2)
70 #define VL6180_CLEAR_ALS BIT(1)
71 #define VL6180_CLEAR_RANGE BIT(0)
72
73 /* bits of the HOLD register */
74 #define VL6180_HOLD_ON BIT(0)
75
76 /* default value for the ALS_IT register */
77 #define VL6180_ALS_IT_100 0x63 /* 100 ms */
78
79 /* values for the ALS_GAIN register */
80 #define VL6180_ALS_GAIN_1 0x46
81 #define VL6180_ALS_GAIN_1_25 0x45
82 #define VL6180_ALS_GAIN_1_67 0x44
83 #define VL6180_ALS_GAIN_2_5 0x43
84 #define VL6180_ALS_GAIN_5 0x42
85 #define VL6180_ALS_GAIN_10 0x41
86 #define VL6180_ALS_GAIN_20 0x40
87 #define VL6180_ALS_GAIN_40 0x47
88
89 struct vl6180_data {
90 struct i2c_client *client;
91 struct mutex lock;
92 struct completion completion;
93 struct iio_trigger *trig;
94 unsigned int als_gain_milli;
95 unsigned int als_it_ms;
96 unsigned int als_meas_rate;
97 unsigned int range_meas_rate;
98 };
99
100 enum { VL6180_ALS, VL6180_RANGE, VL6180_PROX };
101
102 /**
103 * struct vl6180_chan_regs - Registers for accessing channels
104 * @drdy_mask: Data ready bit in status register
105 * @start_reg: Conversion start register
106 * @value_reg: Result value register
107 * @word: Register word length
108 */
109 struct vl6180_chan_regs {
110 u8 drdy_mask;
111 u16 start_reg, value_reg;
112 bool word;
113 };
114
115 static const struct vl6180_chan_regs vl6180_chan_regs_table[] = {
116 [VL6180_ALS] = {
117 .drdy_mask = VL6180_ALS_READY,
118 .start_reg = VL6180_ALS_START,
119 .value_reg = VL6180_ALS_VALUE,
120 .word = true,
121 },
122 [VL6180_RANGE] = {
123 .drdy_mask = VL6180_RANGE_READY,
124 .start_reg = VL6180_RANGE_START,
125 .value_reg = VL6180_RANGE_VALUE,
126 .word = false,
127 },
128 [VL6180_PROX] = {
129 .drdy_mask = VL6180_RANGE_READY,
130 .start_reg = VL6180_RANGE_START,
131 .value_reg = VL6180_RANGE_RATE,
132 .word = true,
133 },
134 };
135
vl6180_read(struct i2c_client * client,u16 cmd,void * databuf,u8 len)136 static int vl6180_read(struct i2c_client *client, u16 cmd, void *databuf,
137 u8 len)
138 {
139 __be16 cmdbuf = cpu_to_be16(cmd);
140 struct i2c_msg msgs[2] = {
141 { .addr = client->addr, .len = sizeof(cmdbuf), .buf = (u8 *) &cmdbuf },
142 { .addr = client->addr, .len = len, .buf = databuf,
143 .flags = I2C_M_RD } };
144 int ret;
145
146 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
147 if (ret < 0)
148 dev_err(&client->dev, "failed reading register 0x%04x\n", cmd);
149
150 return ret;
151 }
152
vl6180_read_byte(struct i2c_client * client,u16 cmd)153 static int vl6180_read_byte(struct i2c_client *client, u16 cmd)
154 {
155 u8 data;
156 int ret;
157
158 ret = vl6180_read(client, cmd, &data, sizeof(data));
159 if (ret < 0)
160 return ret;
161
162 return data;
163 }
164
vl6180_read_word(struct i2c_client * client,u16 cmd)165 static int vl6180_read_word(struct i2c_client *client, u16 cmd)
166 {
167 __be16 data;
168 int ret;
169
170 ret = vl6180_read(client, cmd, &data, sizeof(data));
171 if (ret < 0)
172 return ret;
173
174 return be16_to_cpu(data);
175 }
176
vl6180_write_byte(struct i2c_client * client,u16 cmd,u8 val)177 static int vl6180_write_byte(struct i2c_client *client, u16 cmd, u8 val)
178 {
179 u8 buf[3];
180 struct i2c_msg msgs[1] = {
181 { .addr = client->addr, .len = sizeof(buf), .buf = (u8 *) &buf } };
182 int ret;
183
184 buf[0] = cmd >> 8;
185 buf[1] = cmd & 0xff;
186 buf[2] = val;
187
188 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
189 if (ret < 0) {
190 dev_err(&client->dev, "failed writing register 0x%04x\n", cmd);
191 return ret;
192 }
193
194 return 0;
195 }
196
vl6180_write_word(struct i2c_client * client,u16 cmd,u16 val)197 static int vl6180_write_word(struct i2c_client *client, u16 cmd, u16 val)
198 {
199 __be16 buf[2];
200 struct i2c_msg msgs[1] = {
201 { .addr = client->addr, .len = sizeof(buf), .buf = (u8 *) &buf } };
202 int ret;
203
204 buf[0] = cpu_to_be16(cmd);
205 buf[1] = cpu_to_be16(val);
206
207 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
208 if (ret < 0) {
209 dev_err(&client->dev, "failed writing register 0x%04x\n", cmd);
210 return ret;
211 }
212
213 return 0;
214 }
215
vl6180_measure(struct vl6180_data * data,int addr)216 static int vl6180_measure(struct vl6180_data *data, int addr)
217 {
218 struct i2c_client *client = data->client;
219 unsigned long time_left;
220 int tries = 20, ret;
221 u16 value;
222
223 mutex_lock(&data->lock);
224 reinit_completion(&data->completion);
225
226 /* Start single shot measurement */
227 ret = vl6180_write_byte(client,
228 vl6180_chan_regs_table[addr].start_reg, VL6180_STARTSTOP);
229 if (ret < 0)
230 goto fail;
231
232 if (client->irq) {
233 time_left = wait_for_completion_timeout(&data->completion, HZ / 10);
234 if (time_left == 0) {
235 ret = -ETIMEDOUT;
236 goto fail;
237 }
238 } else {
239 while (tries--) {
240 ret = vl6180_read_byte(client, VL6180_INTR_STATUS);
241 if (ret < 0)
242 goto fail;
243
244 if (ret & vl6180_chan_regs_table[addr].drdy_mask)
245 break;
246 msleep(20);
247 }
248
249 if (tries < 0) {
250 ret = -EIO;
251 goto fail;
252 }
253 }
254
255 /* Read result value from appropriate registers */
256 ret = vl6180_chan_regs_table[addr].word ?
257 vl6180_read_word(client, vl6180_chan_regs_table[addr].value_reg) :
258 vl6180_read_byte(client, vl6180_chan_regs_table[addr].value_reg);
259 if (ret < 0)
260 goto fail;
261 value = ret;
262
263 /* Clear the interrupt flag after data read */
264 ret = vl6180_write_byte(client, VL6180_INTR_CLEAR,
265 VL6180_CLEAR_ERROR | VL6180_CLEAR_ALS | VL6180_CLEAR_RANGE);
266 if (ret < 0)
267 goto fail;
268
269 ret = value;
270
271 fail:
272 mutex_unlock(&data->lock);
273
274 return ret;
275 }
276
277 static const struct iio_chan_spec vl6180_channels[] = {
278 {
279 .type = IIO_LIGHT,
280 .address = VL6180_ALS,
281 .scan_index = VL6180_ALS,
282 .scan_type = {
283 .sign = 'u',
284 .realbits = 16,
285 .storagebits = 16,
286 },
287 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
288 BIT(IIO_CHAN_INFO_INT_TIME) |
289 BIT(IIO_CHAN_INFO_SCALE) |
290 BIT(IIO_CHAN_INFO_HARDWAREGAIN) |
291 BIT(IIO_CHAN_INFO_SAMP_FREQ),
292 }, {
293 .type = IIO_DISTANCE,
294 .address = VL6180_RANGE,
295 .scan_index = VL6180_RANGE,
296 .scan_type = {
297 .sign = 'u',
298 .realbits = 8,
299 .storagebits = 8,
300 },
301 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
302 BIT(IIO_CHAN_INFO_SCALE) |
303 BIT(IIO_CHAN_INFO_SAMP_FREQ),
304 }, {
305 .type = IIO_PROXIMITY,
306 .address = VL6180_PROX,
307 .scan_index = VL6180_PROX,
308 .scan_type = {
309 .sign = 'u',
310 .realbits = 16,
311 .storagebits = 16,
312 },
313 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
314 },
315 IIO_CHAN_SOFT_TIMESTAMP(3),
316 };
317
318 /*
319 * Available Ambient Light Sensor gain settings, 1/1000th, and
320 * corresponding setting for the VL6180_ALS_GAIN register
321 */
322 static const int vl6180_als_gain_tab[8] = {
323 1000, 1250, 1670, 2500, 5000, 10000, 20000, 40000
324 };
325 static const u8 vl6180_als_gain_tab_bits[8] = {
326 VL6180_ALS_GAIN_1, VL6180_ALS_GAIN_1_25,
327 VL6180_ALS_GAIN_1_67, VL6180_ALS_GAIN_2_5,
328 VL6180_ALS_GAIN_5, VL6180_ALS_GAIN_10,
329 VL6180_ALS_GAIN_20, VL6180_ALS_GAIN_40
330 };
331
vl6180_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)332 static int vl6180_read_raw(struct iio_dev *indio_dev,
333 struct iio_chan_spec const *chan,
334 int *val, int *val2, long mask)
335 {
336 struct vl6180_data *data = iio_priv(indio_dev);
337 int ret;
338
339 switch (mask) {
340 case IIO_CHAN_INFO_RAW:
341 ret = vl6180_measure(data, chan->address);
342 if (ret < 0)
343 return ret;
344 *val = ret;
345
346 return IIO_VAL_INT;
347 case IIO_CHAN_INFO_INT_TIME:
348 *val = data->als_it_ms;
349 *val2 = 1000;
350
351 return IIO_VAL_FRACTIONAL;
352
353 case IIO_CHAN_INFO_SCALE:
354 switch (chan->type) {
355 case IIO_LIGHT:
356 /* one ALS count is 0.32 Lux @ gain 1, IT 100 ms */
357 *val = 32000; /* 0.32 * 1000 * 100 */
358 *val2 = data->als_gain_milli * data->als_it_ms;
359
360 return IIO_VAL_FRACTIONAL;
361
362 case IIO_DISTANCE:
363 *val = 0; /* sensor reports mm, scale to meter */
364 *val2 = 1000;
365 break;
366 default:
367 return -EINVAL;
368 }
369
370 return IIO_VAL_INT_PLUS_MICRO;
371 case IIO_CHAN_INFO_HARDWAREGAIN:
372 *val = data->als_gain_milli;
373 *val2 = 1000;
374
375 return IIO_VAL_FRACTIONAL;
376
377 case IIO_CHAN_INFO_SAMP_FREQ:
378 switch (chan->type) {
379 case IIO_DISTANCE:
380 *val = data->range_meas_rate;
381 return IIO_VAL_INT;
382 case IIO_LIGHT:
383 *val = data->als_meas_rate;
384 return IIO_VAL_INT;
385 default:
386 return -EINVAL;
387 }
388
389 default:
390 return -EINVAL;
391 }
392 }
393
394 static IIO_CONST_ATTR(als_gain_available, "1 1.25 1.67 2.5 5 10 20 40");
395
396 static struct attribute *vl6180_attributes[] = {
397 &iio_const_attr_als_gain_available.dev_attr.attr,
398 NULL
399 };
400
401 static const struct attribute_group vl6180_attribute_group = {
402 .attrs = vl6180_attributes,
403 };
404
405 /* HOLD is needed before updating any config registers */
vl6180_hold(struct vl6180_data * data,bool hold)406 static int vl6180_hold(struct vl6180_data *data, bool hold)
407 {
408 return vl6180_write_byte(data->client, VL6180_HOLD,
409 hold ? VL6180_HOLD_ON : 0);
410 }
411
vl6180_set_als_gain(struct vl6180_data * data,int val,int val2)412 static int vl6180_set_als_gain(struct vl6180_data *data, int val, int val2)
413 {
414 int i, ret, gain;
415
416 if (val < 1 || val > 40)
417 return -EINVAL;
418
419 gain = (val * 1000000 + val2) / 1000;
420 if (gain < 1 || gain > 40000)
421 return -EINVAL;
422
423 i = find_closest(gain, vl6180_als_gain_tab,
424 ARRAY_SIZE(vl6180_als_gain_tab));
425
426 mutex_lock(&data->lock);
427 ret = vl6180_hold(data, true);
428 if (ret < 0)
429 goto fail;
430
431 ret = vl6180_write_byte(data->client, VL6180_ALS_GAIN,
432 vl6180_als_gain_tab_bits[i]);
433
434 if (ret >= 0)
435 data->als_gain_milli = vl6180_als_gain_tab[i];
436
437 fail:
438 vl6180_hold(data, false);
439 mutex_unlock(&data->lock);
440 return ret;
441 }
442
vl6180_set_it(struct vl6180_data * data,int val,int val2)443 static int vl6180_set_it(struct vl6180_data *data, int val, int val2)
444 {
445 int ret, it_ms;
446
447 it_ms = DIV_ROUND_CLOSEST(val2, 1000); /* round to ms */
448 if (val != 0 || it_ms < 1 || it_ms > 512)
449 return -EINVAL;
450
451 mutex_lock(&data->lock);
452 ret = vl6180_hold(data, true);
453 if (ret < 0)
454 goto fail;
455
456 ret = vl6180_write_word(data->client, VL6180_ALS_IT, it_ms - 1);
457
458 if (ret >= 0)
459 data->als_it_ms = it_ms;
460
461 fail:
462 vl6180_hold(data, false);
463 mutex_unlock(&data->lock);
464
465 return ret;
466 }
467
vl6180_meas_reg_val_from_mhz(unsigned int mhz)468 static int vl6180_meas_reg_val_from_mhz(unsigned int mhz)
469 {
470 unsigned int period = DIV_ROUND_CLOSEST(1000 * 1000, mhz);
471 unsigned int reg_val = 0;
472
473 if (period > 10)
474 reg_val = period < 2550 ? (DIV_ROUND_CLOSEST(period, 10) - 1) : 254;
475
476 return reg_val;
477 }
478
vl6180_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)479 static int vl6180_write_raw(struct iio_dev *indio_dev,
480 struct iio_chan_spec const *chan,
481 int val, int val2, long mask)
482 {
483 struct vl6180_data *data = iio_priv(indio_dev);
484 unsigned int reg_val;
485
486 switch (mask) {
487 case IIO_CHAN_INFO_INT_TIME:
488 return vl6180_set_it(data, val, val2);
489
490 case IIO_CHAN_INFO_HARDWAREGAIN:
491 if (chan->type != IIO_LIGHT)
492 return -EINVAL;
493
494 return vl6180_set_als_gain(data, val, val2);
495
496 case IIO_CHAN_INFO_SAMP_FREQ:
497 {
498 guard(mutex)(&data->lock);
499 switch (chan->type) {
500 case IIO_DISTANCE:
501 data->range_meas_rate = val;
502 reg_val = vl6180_meas_reg_val_from_mhz(val);
503 return vl6180_write_byte(data->client,
504 VL6180_RANGE_INTER_MEAS_TIME, reg_val);
505
506 case IIO_LIGHT:
507 data->als_meas_rate = val;
508 reg_val = vl6180_meas_reg_val_from_mhz(val);
509 return vl6180_write_byte(data->client,
510 VL6180_ALS_INTER_MEAS_TIME, reg_val);
511
512 default:
513 return -EINVAL;
514 }
515 }
516
517 default:
518 return -EINVAL;
519 }
520 }
521
vl6180_threaded_irq(int irq,void * priv)522 static irqreturn_t vl6180_threaded_irq(int irq, void *priv)
523 {
524 struct iio_dev *indio_dev = priv;
525 struct vl6180_data *data = iio_priv(indio_dev);
526
527 if (iio_buffer_enabled(indio_dev))
528 iio_trigger_poll_nested(indio_dev->trig);
529 else
530 complete(&data->completion);
531
532 return IRQ_HANDLED;
533 }
534
vl6180_trigger_handler(int irq,void * priv)535 static irqreturn_t vl6180_trigger_handler(int irq, void *priv)
536 {
537 struct iio_poll_func *pf = priv;
538 struct iio_dev *indio_dev = pf->indio_dev;
539 struct vl6180_data *data = iio_priv(indio_dev);
540 s64 time_ns = iio_get_time_ns(indio_dev);
541 int ret, bit, i = 0;
542 struct {
543 u16 chan[2];
544 aligned_s64 timestamp;
545 } scan = { };
546
547
548 iio_for_each_active_channel(indio_dev, bit) {
549 if (vl6180_chan_regs_table[bit].word)
550 ret = vl6180_read_word(data->client,
551 vl6180_chan_regs_table[bit].value_reg);
552 else
553 ret = vl6180_read_byte(data->client,
554 vl6180_chan_regs_table[bit].value_reg);
555
556 if (ret < 0) {
557 dev_err(&data->client->dev,
558 "failed to read from value regs: %d\n", ret);
559 return IRQ_HANDLED;
560 }
561
562 scan.chan[i++] = ret;
563 }
564
565 iio_push_to_buffers_with_ts(indio_dev, &scan, sizeof(scan), time_ns);
566 iio_trigger_notify_done(indio_dev->trig);
567
568 /* Clear the interrupt flag after data read */
569 ret = vl6180_write_byte(data->client, VL6180_INTR_CLEAR,
570 VL6180_CLEAR_ERROR | VL6180_CLEAR_ALS | VL6180_CLEAR_RANGE);
571 if (ret < 0)
572 dev_err(&data->client->dev, "failed to clear irq: %d\n", ret);
573
574 return IRQ_HANDLED;
575 }
576
577 static const struct iio_info vl6180_info = {
578 .read_raw = vl6180_read_raw,
579 .write_raw = vl6180_write_raw,
580 .attrs = &vl6180_attribute_group,
581 .validate_trigger = iio_validate_own_trigger,
582 };
583
vl6180_buffer_postenable(struct iio_dev * indio_dev)584 static int vl6180_buffer_postenable(struct iio_dev *indio_dev)
585 {
586 struct vl6180_data *data = iio_priv(indio_dev);
587 int bit;
588
589 iio_for_each_active_channel(indio_dev, bit)
590 return vl6180_write_byte(data->client,
591 vl6180_chan_regs_table[bit].start_reg,
592 VL6180_MODE_CONT | VL6180_STARTSTOP);
593
594 return -EINVAL;
595 }
596
vl6180_buffer_postdisable(struct iio_dev * indio_dev)597 static int vl6180_buffer_postdisable(struct iio_dev *indio_dev)
598 {
599 struct vl6180_data *data = iio_priv(indio_dev);
600 int bit;
601
602 iio_for_each_active_channel(indio_dev, bit)
603 return vl6180_write_byte(data->client,
604 vl6180_chan_regs_table[bit].start_reg,
605 VL6180_STARTSTOP);
606
607 return -EINVAL;
608 }
609
610 static const struct iio_buffer_setup_ops iio_triggered_buffer_setup_ops = {
611 .postenable = &vl6180_buffer_postenable,
612 .postdisable = &vl6180_buffer_postdisable,
613 };
614
615 static const struct iio_trigger_ops vl6180_trigger_ops = {
616 .validate_device = iio_trigger_validate_own_device,
617 };
618
vl6180_init(struct vl6180_data * data,struct iio_dev * indio_dev)619 static int vl6180_init(struct vl6180_data *data, struct iio_dev *indio_dev)
620 {
621 struct i2c_client *client = data->client;
622 int ret;
623
624 ret = vl6180_read_byte(client, VL6180_MODEL_ID);
625 if (ret < 0)
626 return ret;
627
628 if (ret != VL6180_MODEL_ID_VAL) {
629 dev_err(&client->dev, "invalid model ID %02x\n", ret);
630 return -ENODEV;
631 }
632
633 ret = vl6180_hold(data, true);
634 if (ret < 0)
635 return ret;
636
637 ret = vl6180_read_byte(client, VL6180_OUT_OF_RESET);
638 if (ret < 0)
639 return ret;
640
641 /*
642 * Detect false reset condition here. This bit is always set when the
643 * system comes out of reset.
644 */
645 if (ret != 0x01)
646 dev_info(&client->dev, "device is not fresh out of reset\n");
647
648 /* Enable ALS and Range ready interrupts */
649 ret = vl6180_write_byte(client, VL6180_INTR_CONFIG,
650 VL6180_ALS_READY | VL6180_RANGE_READY);
651 if (ret < 0)
652 return ret;
653
654 ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, NULL,
655 &vl6180_trigger_handler,
656 &iio_triggered_buffer_setup_ops);
657 if (ret)
658 return ret;
659
660 /* Default Range inter-measurement time: 50ms or 20000 mHz */
661 ret = vl6180_write_byte(client, VL6180_RANGE_INTER_MEAS_TIME,
662 vl6180_meas_reg_val_from_mhz(20000));
663 if (ret < 0)
664 return ret;
665 data->range_meas_rate = 20000;
666
667 /* Default ALS inter-measurement time: 10ms or 100000 mHz */
668 ret = vl6180_write_byte(client, VL6180_ALS_INTER_MEAS_TIME,
669 vl6180_meas_reg_val_from_mhz(100000));
670 if (ret < 0)
671 return ret;
672 data->als_meas_rate = 100000;
673
674 /* ALS integration time: 100ms */
675 data->als_it_ms = 100;
676 ret = vl6180_write_word(client, VL6180_ALS_IT, VL6180_ALS_IT_100);
677 if (ret < 0)
678 return ret;
679
680 /* ALS gain: 1 */
681 data->als_gain_milli = 1000;
682 ret = vl6180_write_byte(client, VL6180_ALS_GAIN, VL6180_ALS_GAIN_1);
683 if (ret < 0)
684 return ret;
685
686 ret = vl6180_write_byte(client, VL6180_OUT_OF_RESET, 0x00);
687 if (ret < 0)
688 return ret;
689
690 return vl6180_hold(data, false);
691 }
692
vl6180_probe(struct i2c_client * client)693 static int vl6180_probe(struct i2c_client *client)
694 {
695 struct vl6180_data *data;
696 struct iio_dev *indio_dev;
697 int ret;
698
699 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
700 if (!indio_dev)
701 return -ENOMEM;
702
703 data = iio_priv(indio_dev);
704 i2c_set_clientdata(client, indio_dev);
705 data->client = client;
706 mutex_init(&data->lock);
707
708 indio_dev->info = &vl6180_info;
709 indio_dev->channels = vl6180_channels;
710 indio_dev->num_channels = ARRAY_SIZE(vl6180_channels);
711 indio_dev->name = VL6180_DRV_NAME;
712 indio_dev->modes = INDIO_DIRECT_MODE;
713
714 ret = vl6180_init(data, indio_dev);
715 if (ret < 0)
716 return ret;
717
718 if (client->irq) {
719 ret = devm_request_threaded_irq(&client->dev, client->irq,
720 NULL, vl6180_threaded_irq,
721 IRQF_ONESHOT,
722 indio_dev->name, indio_dev);
723 if (ret)
724 return ret;
725
726 init_completion(&data->completion);
727
728 data->trig = devm_iio_trigger_alloc(&client->dev, "%s-dev%d",
729 indio_dev->name, iio_device_id(indio_dev));
730 if (!data->trig)
731 return -ENOMEM;
732
733 data->trig->ops = &vl6180_trigger_ops;
734 iio_trigger_set_drvdata(data->trig, indio_dev);
735 ret = devm_iio_trigger_register(&client->dev, data->trig);
736 if (ret)
737 return ret;
738
739 indio_dev->trig = iio_trigger_get(data->trig);
740 }
741
742 return devm_iio_device_register(&client->dev, indio_dev);
743 }
744
745 static const struct of_device_id vl6180_of_match[] = {
746 { .compatible = "st,vl6180", },
747 { }
748 };
749 MODULE_DEVICE_TABLE(of, vl6180_of_match);
750
751 static const struct i2c_device_id vl6180_id[] = {
752 { .name = "vl6180" },
753 { }
754 };
755 MODULE_DEVICE_TABLE(i2c, vl6180_id);
756
757 static struct i2c_driver vl6180_driver = {
758 .driver = {
759 .name = VL6180_DRV_NAME,
760 .of_match_table = vl6180_of_match,
761 },
762 .probe = vl6180_probe,
763 .id_table = vl6180_id,
764 };
765
766 module_i2c_driver(vl6180_driver);
767
768 MODULE_AUTHOR("Peter Meerwald-Stadler <pmeerw@pmeerw.net>");
769 MODULE_AUTHOR("Manivannan Sadhasivam <manivannanece23@gmail.com>");
770 MODULE_DESCRIPTION("STMicro VL6180 ALS, range and proximity sensor driver");
771 MODULE_LICENSE("GPL");
772