Merge tag 'dma-mapping-6.5-2023-07-09' of git://git.infradead.org/users/hch/dma-mapping
[platform/kernel/linux-rpi.git] / drivers / iio / light / isl29018.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * A iio driver for the light sensor ISL 29018/29023/29035.
4  *
5  * IIO driver for monitoring ambient light intensity in luxi, proximity
6  * sensing and infrared sensing.
7  *
8  * Copyright (c) 2010, NVIDIA Corporation.
9  */
10
11 #include <linux/module.h>
12 #include <linux/i2c.h>
13 #include <linux/err.h>
14 #include <linux/mutex.h>
15 #include <linux/delay.h>
16 #include <linux/regmap.h>
17 #include <linux/regulator/consumer.h>
18 #include <linux/slab.h>
19 #include <linux/iio/iio.h>
20 #include <linux/iio/sysfs.h>
21 #include <linux/acpi.h>
22
23 #define ISL29018_CONV_TIME_MS           100
24
25 #define ISL29018_REG_ADD_COMMAND1       0x00
26 #define ISL29018_CMD1_OPMODE_SHIFT      5
27 #define ISL29018_CMD1_OPMODE_MASK       (7 << ISL29018_CMD1_OPMODE_SHIFT)
28 #define ISL29018_CMD1_OPMODE_POWER_DOWN 0
29 #define ISL29018_CMD1_OPMODE_ALS_ONCE   1
30 #define ISL29018_CMD1_OPMODE_IR_ONCE    2
31 #define ISL29018_CMD1_OPMODE_PROX_ONCE  3
32
33 #define ISL29018_REG_ADD_COMMAND2       0x01
34 #define ISL29018_CMD2_RESOLUTION_SHIFT  2
35 #define ISL29018_CMD2_RESOLUTION_MASK   (0x3 << ISL29018_CMD2_RESOLUTION_SHIFT)
36
37 #define ISL29018_CMD2_RANGE_SHIFT       0
38 #define ISL29018_CMD2_RANGE_MASK        (0x3 << ISL29018_CMD2_RANGE_SHIFT)
39
40 #define ISL29018_CMD2_SCHEME_SHIFT      7
41 #define ISL29018_CMD2_SCHEME_MASK       (0x1 << ISL29018_CMD2_SCHEME_SHIFT)
42
43 #define ISL29018_REG_ADD_DATA_LSB       0x02
44 #define ISL29018_REG_ADD_DATA_MSB       0x03
45
46 #define ISL29018_REG_TEST               0x08
47 #define ISL29018_TEST_SHIFT             0
48 #define ISL29018_TEST_MASK              (0xFF << ISL29018_TEST_SHIFT)
49
50 #define ISL29035_REG_DEVICE_ID          0x0F
51 #define ISL29035_DEVICE_ID_SHIFT        0x03
52 #define ISL29035_DEVICE_ID_MASK         (0x7 << ISL29035_DEVICE_ID_SHIFT)
53 #define ISL29035_DEVICE_ID              0x5
54 #define ISL29035_BOUT_SHIFT             0x07
55 #define ISL29035_BOUT_MASK              (0x01 << ISL29035_BOUT_SHIFT)
56
57 enum isl29018_int_time {
58         ISL29018_INT_TIME_16,
59         ISL29018_INT_TIME_12,
60         ISL29018_INT_TIME_8,
61         ISL29018_INT_TIME_4,
62 };
63
64 static const unsigned int isl29018_int_utimes[3][4] = {
65         {90000, 5630, 351, 21},
66         {90000, 5600, 352, 22},
67         {105000, 6500, 410, 25},
68 };
69
70 static const struct isl29018_scale {
71         unsigned int scale;
72         unsigned int uscale;
73 } isl29018_scales[4][4] = {
74         { {0, 15258}, {0, 61035}, {0, 244140}, {0, 976562} },
75         { {0, 244140}, {0, 976562}, {3, 906250}, {15, 625000} },
76         { {3, 906250}, {15, 625000}, {62, 500000}, {250, 0} },
77         { {62, 500000}, {250, 0}, {1000, 0}, {4000, 0} }
78 };
79
80 struct isl29018_chip {
81         struct regmap           *regmap;
82         struct mutex            lock;
83         int                     type;
84         unsigned int            calibscale;
85         unsigned int            ucalibscale;
86         unsigned int            int_time;
87         struct isl29018_scale   scale;
88         int                     prox_scheme;
89         bool                    suspended;
90         struct regulator        *vcc_reg;
91 };
92
93 static int isl29018_set_integration_time(struct isl29018_chip *chip,
94                                          unsigned int utime)
95 {
96         unsigned int i;
97         int ret;
98         unsigned int int_time, new_int_time;
99
100         for (i = 0; i < ARRAY_SIZE(isl29018_int_utimes[chip->type]); ++i) {
101                 if (utime == isl29018_int_utimes[chip->type][i]) {
102                         new_int_time = i;
103                         break;
104                 }
105         }
106
107         if (i >= ARRAY_SIZE(isl29018_int_utimes[chip->type]))
108                 return -EINVAL;
109
110         ret = regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMAND2,
111                                  ISL29018_CMD2_RESOLUTION_MASK,
112                                  i << ISL29018_CMD2_RESOLUTION_SHIFT);
113         if (ret < 0)
114                 return ret;
115
116         /* Keep the same range when integration time changes */
117         int_time = chip->int_time;
118         for (i = 0; i < ARRAY_SIZE(isl29018_scales[int_time]); ++i) {
119                 if (chip->scale.scale == isl29018_scales[int_time][i].scale &&
120                     chip->scale.uscale == isl29018_scales[int_time][i].uscale) {
121                         chip->scale = isl29018_scales[new_int_time][i];
122                         break;
123                 }
124         }
125         chip->int_time = new_int_time;
126
127         return 0;
128 }
129
130 static int isl29018_set_scale(struct isl29018_chip *chip, int scale, int uscale)
131 {
132         unsigned int i;
133         int ret;
134         struct isl29018_scale new_scale;
135
136         for (i = 0; i < ARRAY_SIZE(isl29018_scales[chip->int_time]); ++i) {
137                 if (scale == isl29018_scales[chip->int_time][i].scale &&
138                     uscale == isl29018_scales[chip->int_time][i].uscale) {
139                         new_scale = isl29018_scales[chip->int_time][i];
140                         break;
141                 }
142         }
143
144         if (i >= ARRAY_SIZE(isl29018_scales[chip->int_time]))
145                 return -EINVAL;
146
147         ret = regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMAND2,
148                                  ISL29018_CMD2_RANGE_MASK,
149                                  i << ISL29018_CMD2_RANGE_SHIFT);
150         if (ret < 0)
151                 return ret;
152
153         chip->scale = new_scale;
154
155         return 0;
156 }
157
158 static int isl29018_read_sensor_input(struct isl29018_chip *chip, int mode)
159 {
160         int status;
161         unsigned int lsb;
162         unsigned int msb;
163         struct device *dev = regmap_get_device(chip->regmap);
164
165         /* Set mode */
166         status = regmap_write(chip->regmap, ISL29018_REG_ADD_COMMAND1,
167                               mode << ISL29018_CMD1_OPMODE_SHIFT);
168         if (status) {
169                 dev_err(dev,
170                         "Error in setting operating mode err %d\n", status);
171                 return status;
172         }
173         msleep(ISL29018_CONV_TIME_MS);
174         status = regmap_read(chip->regmap, ISL29018_REG_ADD_DATA_LSB, &lsb);
175         if (status < 0) {
176                 dev_err(dev,
177                         "Error in reading LSB DATA with err %d\n", status);
178                 return status;
179         }
180
181         status = regmap_read(chip->regmap, ISL29018_REG_ADD_DATA_MSB, &msb);
182         if (status < 0) {
183                 dev_err(dev,
184                         "Error in reading MSB DATA with error %d\n", status);
185                 return status;
186         }
187         dev_vdbg(dev, "MSB 0x%x and LSB 0x%x\n", msb, lsb);
188
189         return (msb << 8) | lsb;
190 }
191
192 static int isl29018_read_lux(struct isl29018_chip *chip, int *lux)
193 {
194         int lux_data;
195         unsigned int data_x_range;
196
197         lux_data = isl29018_read_sensor_input(chip,
198                                               ISL29018_CMD1_OPMODE_ALS_ONCE);
199         if (lux_data < 0)
200                 return lux_data;
201
202         data_x_range = lux_data * chip->scale.scale +
203                        lux_data * chip->scale.uscale / 1000000;
204         *lux = data_x_range * chip->calibscale +
205                data_x_range * chip->ucalibscale / 1000000;
206
207         return 0;
208 }
209
210 static int isl29018_read_ir(struct isl29018_chip *chip, int *ir)
211 {
212         int ir_data;
213
214         ir_data = isl29018_read_sensor_input(chip,
215                                              ISL29018_CMD1_OPMODE_IR_ONCE);
216         if (ir_data < 0)
217                 return ir_data;
218
219         *ir = ir_data;
220
221         return 0;
222 }
223
224 static int isl29018_read_proximity_ir(struct isl29018_chip *chip, int scheme,
225                                       int *near_ir)
226 {
227         int status;
228         int prox_data = -1;
229         int ir_data = -1;
230         struct device *dev = regmap_get_device(chip->regmap);
231
232         /* Do proximity sensing with required scheme */
233         status = regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMAND2,
234                                     ISL29018_CMD2_SCHEME_MASK,
235                                     scheme << ISL29018_CMD2_SCHEME_SHIFT);
236         if (status) {
237                 dev_err(dev, "Error in setting operating mode\n");
238                 return status;
239         }
240
241         prox_data = isl29018_read_sensor_input(chip,
242                                                ISL29018_CMD1_OPMODE_PROX_ONCE);
243         if (prox_data < 0)
244                 return prox_data;
245
246         if (scheme == 1) {
247                 *near_ir = prox_data;
248                 return 0;
249         }
250
251         ir_data = isl29018_read_sensor_input(chip,
252                                              ISL29018_CMD1_OPMODE_IR_ONCE);
253         if (ir_data < 0)
254                 return ir_data;
255
256         if (prox_data >= ir_data)
257                 *near_ir = prox_data - ir_data;
258         else
259                 *near_ir = 0;
260
261         return 0;
262 }
263
264 static ssize_t in_illuminance_scale_available_show
265                         (struct device *dev, struct device_attribute *attr,
266                          char *buf)
267 {
268         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
269         struct isl29018_chip *chip = iio_priv(indio_dev);
270         unsigned int i;
271         int len = 0;
272
273         mutex_lock(&chip->lock);
274         for (i = 0; i < ARRAY_SIZE(isl29018_scales[chip->int_time]); ++i)
275                 len += sprintf(buf + len, "%d.%06d ",
276                                isl29018_scales[chip->int_time][i].scale,
277                                isl29018_scales[chip->int_time][i].uscale);
278         mutex_unlock(&chip->lock);
279
280         buf[len - 1] = '\n';
281
282         return len;
283 }
284
285 static ssize_t in_illuminance_integration_time_available_show
286                         (struct device *dev, struct device_attribute *attr,
287                          char *buf)
288 {
289         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
290         struct isl29018_chip *chip = iio_priv(indio_dev);
291         unsigned int i;
292         int len = 0;
293
294         for (i = 0; i < ARRAY_SIZE(isl29018_int_utimes[chip->type]); ++i)
295                 len += sprintf(buf + len, "0.%06d ",
296                                isl29018_int_utimes[chip->type][i]);
297
298         buf[len - 1] = '\n';
299
300         return len;
301 }
302
303 /*
304  * From ISL29018 Data Sheet (FN6619.4, Oct 8, 2012) regarding the
305  * infrared suppression:
306  *
307  *   Proximity Sensing Scheme: Bit 7. This bit programs the function
308  * of the proximity detection. Logic 0 of this bit, Scheme 0, makes
309  * full n (4, 8, 12, 16) bits (unsigned) proximity detection. The range
310  * of Scheme 0 proximity count is from 0 to 2^n. Logic 1 of this bit,
311  * Scheme 1, makes n-1 (3, 7, 11, 15) bits (2's complementary)
312  * proximity_less_ambient detection. The range of Scheme 1
313  * proximity count is from -2^(n-1) to 2^(n-1) . The sign bit is extended
314  * for resolutions less than 16. While Scheme 0 has wider dynamic
315  * range, Scheme 1 proximity detection is less affected by the
316  * ambient IR noise variation.
317  *
318  * 0 Sensing IR from LED and ambient
319  * 1 Sensing IR from LED with ambient IR rejection
320  */
321 static ssize_t proximity_on_chip_ambient_infrared_suppression_show
322                         (struct device *dev, struct device_attribute *attr,
323                          char *buf)
324 {
325         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
326         struct isl29018_chip *chip = iio_priv(indio_dev);
327
328         /*
329          * Return the "proximity scheme" i.e. if the chip does on chip
330          * infrared suppression (1 means perform on chip suppression)
331          */
332         return sprintf(buf, "%d\n", chip->prox_scheme);
333 }
334
335 static ssize_t proximity_on_chip_ambient_infrared_suppression_store
336                         (struct device *dev, struct device_attribute *attr,
337                          const char *buf, size_t count)
338 {
339         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
340         struct isl29018_chip *chip = iio_priv(indio_dev);
341         int val;
342
343         if (kstrtoint(buf, 10, &val))
344                 return -EINVAL;
345         if (!(val == 0 || val == 1))
346                 return -EINVAL;
347
348         /*
349          * Get the "proximity scheme" i.e. if the chip does on chip
350          * infrared suppression (1 means perform on chip suppression)
351          */
352         mutex_lock(&chip->lock);
353         chip->prox_scheme = val;
354         mutex_unlock(&chip->lock);
355
356         return count;
357 }
358
359 static int isl29018_write_raw(struct iio_dev *indio_dev,
360                               struct iio_chan_spec const *chan,
361                               int val,
362                               int val2,
363                               long mask)
364 {
365         struct isl29018_chip *chip = iio_priv(indio_dev);
366         int ret = -EINVAL;
367
368         mutex_lock(&chip->lock);
369         if (chip->suspended) {
370                 ret = -EBUSY;
371                 goto write_done;
372         }
373         switch (mask) {
374         case IIO_CHAN_INFO_CALIBSCALE:
375                 if (chan->type == IIO_LIGHT) {
376                         chip->calibscale = val;
377                         chip->ucalibscale = val2;
378                         ret = 0;
379                 }
380                 break;
381         case IIO_CHAN_INFO_INT_TIME:
382                 if (chan->type == IIO_LIGHT && !val)
383                         ret = isl29018_set_integration_time(chip, val2);
384                 break;
385         case IIO_CHAN_INFO_SCALE:
386                 if (chan->type == IIO_LIGHT)
387                         ret = isl29018_set_scale(chip, val, val2);
388                 break;
389         default:
390                 break;
391         }
392
393 write_done:
394         mutex_unlock(&chip->lock);
395
396         return ret;
397 }
398
399 static int isl29018_read_raw(struct iio_dev *indio_dev,
400                              struct iio_chan_spec const *chan,
401                              int *val,
402                              int *val2,
403                              long mask)
404 {
405         int ret = -EINVAL;
406         struct isl29018_chip *chip = iio_priv(indio_dev);
407
408         mutex_lock(&chip->lock);
409         if (chip->suspended) {
410                 ret = -EBUSY;
411                 goto read_done;
412         }
413         switch (mask) {
414         case IIO_CHAN_INFO_RAW:
415         case IIO_CHAN_INFO_PROCESSED:
416                 switch (chan->type) {
417                 case IIO_LIGHT:
418                         ret = isl29018_read_lux(chip, val);
419                         break;
420                 case IIO_INTENSITY:
421                         ret = isl29018_read_ir(chip, val);
422                         break;
423                 case IIO_PROXIMITY:
424                         ret = isl29018_read_proximity_ir(chip,
425                                                          chip->prox_scheme,
426                                                          val);
427                         break;
428                 default:
429                         break;
430                 }
431                 if (!ret)
432                         ret = IIO_VAL_INT;
433                 break;
434         case IIO_CHAN_INFO_INT_TIME:
435                 if (chan->type == IIO_LIGHT) {
436                         *val = 0;
437                         *val2 = isl29018_int_utimes[chip->type][chip->int_time];
438                         ret = IIO_VAL_INT_PLUS_MICRO;
439                 }
440                 break;
441         case IIO_CHAN_INFO_SCALE:
442                 if (chan->type == IIO_LIGHT) {
443                         *val = chip->scale.scale;
444                         *val2 = chip->scale.uscale;
445                         ret = IIO_VAL_INT_PLUS_MICRO;
446                 }
447                 break;
448         case IIO_CHAN_INFO_CALIBSCALE:
449                 if (chan->type == IIO_LIGHT) {
450                         *val = chip->calibscale;
451                         *val2 = chip->ucalibscale;
452                         ret = IIO_VAL_INT_PLUS_MICRO;
453                 }
454                 break;
455         default:
456                 break;
457         }
458
459 read_done:
460         mutex_unlock(&chip->lock);
461
462         return ret;
463 }
464
465 #define ISL29018_LIGHT_CHANNEL {                                        \
466         .type = IIO_LIGHT,                                              \
467         .indexed = 1,                                                   \
468         .channel = 0,                                                   \
469         .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |            \
470         BIT(IIO_CHAN_INFO_CALIBSCALE) |                                 \
471         BIT(IIO_CHAN_INFO_SCALE) |                                      \
472         BIT(IIO_CHAN_INFO_INT_TIME),                                    \
473 }
474
475 #define ISL29018_IR_CHANNEL {                                           \
476         .type = IIO_INTENSITY,                                          \
477         .modified = 1,                                                  \
478         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),                   \
479         .channel2 = IIO_MOD_LIGHT_IR,                                   \
480 }
481
482 #define ISL29018_PROXIMITY_CHANNEL {                                    \
483         .type = IIO_PROXIMITY,                                          \
484         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),                   \
485 }
486
487 static const struct iio_chan_spec isl29018_channels[] = {
488         ISL29018_LIGHT_CHANNEL,
489         ISL29018_IR_CHANNEL,
490         ISL29018_PROXIMITY_CHANNEL,
491 };
492
493 static const struct iio_chan_spec isl29023_channels[] = {
494         ISL29018_LIGHT_CHANNEL,
495         ISL29018_IR_CHANNEL,
496 };
497
498 static IIO_DEVICE_ATTR_RO(in_illuminance_integration_time_available, 0);
499 static IIO_DEVICE_ATTR_RO(in_illuminance_scale_available, 0);
500 static IIO_DEVICE_ATTR_RW(proximity_on_chip_ambient_infrared_suppression, 0);
501
502 #define ISL29018_DEV_ATTR(name) (&iio_dev_attr_##name.dev_attr.attr)
503
504 static struct attribute *isl29018_attributes[] = {
505         ISL29018_DEV_ATTR(in_illuminance_scale_available),
506         ISL29018_DEV_ATTR(in_illuminance_integration_time_available),
507         ISL29018_DEV_ATTR(proximity_on_chip_ambient_infrared_suppression),
508         NULL
509 };
510
511 static struct attribute *isl29023_attributes[] = {
512         ISL29018_DEV_ATTR(in_illuminance_scale_available),
513         ISL29018_DEV_ATTR(in_illuminance_integration_time_available),
514         NULL
515 };
516
517 static const struct attribute_group isl29018_group = {
518         .attrs = isl29018_attributes,
519 };
520
521 static const struct attribute_group isl29023_group = {
522         .attrs = isl29023_attributes,
523 };
524
525 enum {
526         isl29018,
527         isl29023,
528         isl29035,
529 };
530
531 static int isl29018_chip_init(struct isl29018_chip *chip)
532 {
533         int status;
534         struct device *dev = regmap_get_device(chip->regmap);
535
536         if (chip->type == isl29035) {
537                 unsigned int id;
538
539                 status = regmap_read(chip->regmap, ISL29035_REG_DEVICE_ID, &id);
540                 if (status < 0) {
541                         dev_err(dev,
542                                 "Error reading ID register with error %d\n",
543                                 status);
544                         return status;
545                 }
546
547                 id = (id & ISL29035_DEVICE_ID_MASK) >> ISL29035_DEVICE_ID_SHIFT;
548
549                 if (id != ISL29035_DEVICE_ID)
550                         return -ENODEV;
551
552                 /* Clear brownout bit */
553                 status = regmap_update_bits(chip->regmap,
554                                             ISL29035_REG_DEVICE_ID,
555                                             ISL29035_BOUT_MASK, 0);
556                 if (status < 0)
557                         return status;
558         }
559
560         /*
561          * Code added per Intersil Application Note 1534:
562          *     When VDD sinks to approximately 1.8V or below, some of
563          * the part's registers may change their state. When VDD
564          * recovers to 2.25V (or greater), the part may thus be in an
565          * unknown mode of operation. The user can return the part to
566          * a known mode of operation either by (a) setting VDD = 0V for
567          * 1 second or more and then powering back up with a slew rate
568          * of 0.5V/ms or greater, or (b) via I2C disable all ALS/PROX
569          * conversions, clear the test registers, and then rewrite all
570          * registers to the desired values.
571          * ...
572          * For ISL29011, ISL29018, ISL29021, ISL29023
573          * 1. Write 0x00 to register 0x08 (TEST)
574          * 2. Write 0x00 to register 0x00 (CMD1)
575          * 3. Rewrite all registers to the desired values
576          *
577          * ISL29018 Data Sheet (FN6619.1, Feb 11, 2010) essentially says
578          * the same thing EXCEPT the data sheet asks for a 1ms delay after
579          * writing the CMD1 register.
580          */
581         status = regmap_write(chip->regmap, ISL29018_REG_TEST, 0x0);
582         if (status < 0) {
583                 dev_err(dev, "Failed to clear isl29018 TEST reg.(%d)\n",
584                         status);
585                 return status;
586         }
587
588         /*
589          * See Intersil AN1534 comments above.
590          * "Operating Mode" (COMMAND1) register is reprogrammed when
591          * data is read from the device.
592          */
593         status = regmap_write(chip->regmap, ISL29018_REG_ADD_COMMAND1, 0);
594         if (status < 0) {
595                 dev_err(dev, "Failed to clear isl29018 CMD1 reg.(%d)\n",
596                         status);
597                 return status;
598         }
599
600         usleep_range(1000, 2000);       /* per data sheet, page 10 */
601
602         /* Set defaults */
603         status = isl29018_set_scale(chip, chip->scale.scale,
604                                     chip->scale.uscale);
605         if (status < 0) {
606                 dev_err(dev, "Init of isl29018 fails\n");
607                 return status;
608         }
609
610         status = isl29018_set_integration_time(chip,
611                         isl29018_int_utimes[chip->type][chip->int_time]);
612         if (status < 0)
613                 dev_err(dev, "Init of isl29018 fails\n");
614
615         return status;
616 }
617
618 static const struct iio_info isl29018_info = {
619         .attrs = &isl29018_group,
620         .read_raw = isl29018_read_raw,
621         .write_raw = isl29018_write_raw,
622 };
623
624 static const struct iio_info isl29023_info = {
625         .attrs = &isl29023_group,
626         .read_raw = isl29018_read_raw,
627         .write_raw = isl29018_write_raw,
628 };
629
630 static bool isl29018_is_volatile_reg(struct device *dev, unsigned int reg)
631 {
632         switch (reg) {
633         case ISL29018_REG_ADD_DATA_LSB:
634         case ISL29018_REG_ADD_DATA_MSB:
635         case ISL29018_REG_ADD_COMMAND1:
636         case ISL29018_REG_TEST:
637         case ISL29035_REG_DEVICE_ID:
638                 return true;
639         default:
640                 return false;
641         }
642 }
643
644 static const struct regmap_config isl29018_regmap_config = {
645         .reg_bits = 8,
646         .val_bits = 8,
647         .volatile_reg = isl29018_is_volatile_reg,
648         .max_register = ISL29018_REG_TEST,
649         .num_reg_defaults_raw = ISL29018_REG_TEST + 1,
650         .cache_type = REGCACHE_RBTREE,
651 };
652
653 static const struct regmap_config isl29035_regmap_config = {
654         .reg_bits = 8,
655         .val_bits = 8,
656         .volatile_reg = isl29018_is_volatile_reg,
657         .max_register = ISL29035_REG_DEVICE_ID,
658         .num_reg_defaults_raw = ISL29035_REG_DEVICE_ID + 1,
659         .cache_type = REGCACHE_RBTREE,
660 };
661
662 struct isl29018_chip_info {
663         const struct iio_chan_spec *channels;
664         int num_channels;
665         const struct iio_info *indio_info;
666         const struct regmap_config *regmap_cfg;
667 };
668
669 static const struct isl29018_chip_info isl29018_chip_info_tbl[] = {
670         [isl29018] = {
671                 .channels = isl29018_channels,
672                 .num_channels = ARRAY_SIZE(isl29018_channels),
673                 .indio_info = &isl29018_info,
674                 .regmap_cfg = &isl29018_regmap_config,
675         },
676         [isl29023] = {
677                 .channels = isl29023_channels,
678                 .num_channels = ARRAY_SIZE(isl29023_channels),
679                 .indio_info = &isl29023_info,
680                 .regmap_cfg = &isl29018_regmap_config,
681         },
682         [isl29035] = {
683                 .channels = isl29023_channels,
684                 .num_channels = ARRAY_SIZE(isl29023_channels),
685                 .indio_info = &isl29023_info,
686                 .regmap_cfg = &isl29035_regmap_config,
687         },
688 };
689
690 static const char *isl29018_match_acpi_device(struct device *dev, int *data)
691 {
692         const struct acpi_device_id *id;
693
694         id = acpi_match_device(dev->driver->acpi_match_table, dev);
695
696         if (!id)
697                 return NULL;
698
699         *data = (int)id->driver_data;
700
701         return dev_name(dev);
702 }
703
704 static void isl29018_disable_regulator_action(void *_data)
705 {
706         struct isl29018_chip *chip = _data;
707         int err;
708
709         err = regulator_disable(chip->vcc_reg);
710         if (err)
711                 pr_err("failed to disable isl29018's VCC regulator!\n");
712 }
713
714 static int isl29018_probe(struct i2c_client *client)
715 {
716         const struct i2c_device_id *id = i2c_client_get_device_id(client);
717         struct isl29018_chip *chip;
718         struct iio_dev *indio_dev;
719         int err;
720         const char *name = NULL;
721         int dev_id = 0;
722
723         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
724         if (!indio_dev)
725                 return -ENOMEM;
726
727         chip = iio_priv(indio_dev);
728
729         i2c_set_clientdata(client, indio_dev);
730
731         if (id) {
732                 name = id->name;
733                 dev_id = id->driver_data;
734         }
735
736         if (ACPI_HANDLE(&client->dev))
737                 name = isl29018_match_acpi_device(&client->dev, &dev_id);
738
739         mutex_init(&chip->lock);
740
741         chip->type = dev_id;
742         chip->calibscale = 1;
743         chip->ucalibscale = 0;
744         chip->int_time = ISL29018_INT_TIME_16;
745         chip->scale = isl29018_scales[chip->int_time][0];
746         chip->suspended = false;
747
748         chip->vcc_reg = devm_regulator_get(&client->dev, "vcc");
749         if (IS_ERR(chip->vcc_reg))
750                 return dev_err_probe(&client->dev, PTR_ERR(chip->vcc_reg),
751                                      "failed to get VCC regulator!\n");
752
753         err = regulator_enable(chip->vcc_reg);
754         if (err) {
755                 dev_err(&client->dev, "failed to enable VCC regulator!\n");
756                 return err;
757         }
758
759         err = devm_add_action_or_reset(&client->dev, isl29018_disable_regulator_action,
760                                  chip);
761         if (err) {
762                 dev_err(&client->dev, "failed to setup regulator cleanup action!\n");
763                 return err;
764         }
765
766         chip->regmap = devm_regmap_init_i2c(client,
767                                 isl29018_chip_info_tbl[dev_id].regmap_cfg);
768         if (IS_ERR(chip->regmap)) {
769                 err = PTR_ERR(chip->regmap);
770                 dev_err(&client->dev, "regmap initialization fails: %d\n", err);
771                 return err;
772         }
773
774         err = isl29018_chip_init(chip);
775         if (err)
776                 return err;
777
778         indio_dev->info = isl29018_chip_info_tbl[dev_id].indio_info;
779         indio_dev->channels = isl29018_chip_info_tbl[dev_id].channels;
780         indio_dev->num_channels = isl29018_chip_info_tbl[dev_id].num_channels;
781         indio_dev->name = name;
782         indio_dev->modes = INDIO_DIRECT_MODE;
783
784         return devm_iio_device_register(&client->dev, indio_dev);
785 }
786
787 static int isl29018_suspend(struct device *dev)
788 {
789         struct isl29018_chip *chip = iio_priv(dev_get_drvdata(dev));
790         int ret;
791
792         mutex_lock(&chip->lock);
793
794         /*
795          * Since this driver uses only polling commands, we are by default in
796          * auto shutdown (ie, power-down) mode.
797          * So we do not have much to do here.
798          */
799         chip->suspended = true;
800         ret = regulator_disable(chip->vcc_reg);
801         if (ret)
802                 dev_err(dev, "failed to disable VCC regulator\n");
803
804         mutex_unlock(&chip->lock);
805
806         return ret;
807 }
808
809 static int isl29018_resume(struct device *dev)
810 {
811         struct isl29018_chip *chip = iio_priv(dev_get_drvdata(dev));
812         int err;
813
814         mutex_lock(&chip->lock);
815
816         err = regulator_enable(chip->vcc_reg);
817         if (err) {
818                 dev_err(dev, "failed to enable VCC regulator\n");
819                 mutex_unlock(&chip->lock);
820                 return err;
821         }
822
823         err = isl29018_chip_init(chip);
824         if (!err)
825                 chip->suspended = false;
826
827         mutex_unlock(&chip->lock);
828
829         return err;
830 }
831
832 static DEFINE_SIMPLE_DEV_PM_OPS(isl29018_pm_ops, isl29018_suspend,
833                                 isl29018_resume);
834
835 #ifdef CONFIG_ACPI
836 static const struct acpi_device_id isl29018_acpi_match[] = {
837         {"ISL29018", isl29018},
838         {"ISL29023", isl29023},
839         {"ISL29035", isl29035},
840         {},
841 };
842 MODULE_DEVICE_TABLE(acpi, isl29018_acpi_match);
843 #endif
844
845 static const struct i2c_device_id isl29018_id[] = {
846         {"isl29018", isl29018},
847         {"isl29023", isl29023},
848         {"isl29035", isl29035},
849         {}
850 };
851 MODULE_DEVICE_TABLE(i2c, isl29018_id);
852
853 static const struct of_device_id isl29018_of_match[] = {
854         { .compatible = "isil,isl29018", },
855         { .compatible = "isil,isl29023", },
856         { .compatible = "isil,isl29035", },
857         { },
858 };
859 MODULE_DEVICE_TABLE(of, isl29018_of_match);
860
861 static struct i2c_driver isl29018_driver = {
862         .driver  = {
863                         .name = "isl29018",
864                         .acpi_match_table = ACPI_PTR(isl29018_acpi_match),
865                         .pm = pm_sleep_ptr(&isl29018_pm_ops),
866                         .of_match_table = isl29018_of_match,
867                     },
868         .probe = isl29018_probe,
869         .id_table = isl29018_id,
870 };
871 module_i2c_driver(isl29018_driver);
872
873 MODULE_DESCRIPTION("ISL29018 Ambient Light Sensor driver");
874 MODULE_LICENSE("GPL");