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