Version:  2.0.40 2.2.26 2.4.37 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4

Linux/drivers/staging/iio/light/isl29018.c

  1 /*
  2  * A iio driver for the light sensor ISL 29018/29023/29035.
  3  *
  4  * IIO driver for monitoring ambient light intensity in luxi, proximity
  5  * sensing and infrared sensing.
  6  *
  7  * Copyright (c) 2010, NVIDIA Corporation.
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License as published by
 11  * the Free Software Foundation; either version 2 of the License, or
 12  * (at your option) any later version.
 13  *
 14  * This program is distributed in the hope that it will be useful, but WITHOUT
 15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 16  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 17  * more details.
 18  *
 19  * You should have received a copy of the GNU General Public License along
 20  * with this program; if not, write to the Free Software Foundation, Inc.,
 21  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 22  */
 23 
 24 #include <linux/module.h>
 25 #include <linux/i2c.h>
 26 #include <linux/err.h>
 27 #include <linux/mutex.h>
 28 #include <linux/delay.h>
 29 #include <linux/regmap.h>
 30 #include <linux/slab.h>
 31 #include <linux/iio/iio.h>
 32 #include <linux/iio/sysfs.h>
 33 #include <linux/acpi.h>
 34 
 35 #define CONVERSION_TIME_MS              100
 36 
 37 #define ISL29018_REG_ADD_COMMAND1       0x00
 38 #define COMMMAND1_OPMODE_SHIFT          5
 39 #define COMMMAND1_OPMODE_MASK           (7 << COMMMAND1_OPMODE_SHIFT)
 40 #define COMMMAND1_OPMODE_POWER_DOWN     0
 41 #define COMMMAND1_OPMODE_ALS_ONCE       1
 42 #define COMMMAND1_OPMODE_IR_ONCE        2
 43 #define COMMMAND1_OPMODE_PROX_ONCE      3
 44 
 45 #define ISL29018_REG_ADD_COMMANDII      0x01
 46 #define COMMANDII_RESOLUTION_SHIFT      2
 47 #define COMMANDII_RESOLUTION_MASK       (0x3 << COMMANDII_RESOLUTION_SHIFT)
 48 
 49 #define COMMANDII_RANGE_SHIFT           0
 50 #define COMMANDII_RANGE_MASK            (0x3 << COMMANDII_RANGE_SHIFT)
 51 
 52 #define COMMANDII_SCHEME_SHIFT          7
 53 #define COMMANDII_SCHEME_MASK           (0x1 << COMMANDII_SCHEME_SHIFT)
 54 
 55 #define ISL29018_REG_ADD_DATA_LSB       0x02
 56 #define ISL29018_REG_ADD_DATA_MSB       0x03
 57 
 58 #define ISL29018_REG_TEST               0x08
 59 #define ISL29018_TEST_SHIFT             0
 60 #define ISL29018_TEST_MASK              (0xFF << ISL29018_TEST_SHIFT)
 61 
 62 #define ISL29035_REG_DEVICE_ID          0x0F
 63 #define ISL29035_DEVICE_ID_SHIFT        0x03
 64 #define ISL29035_DEVICE_ID_MASK         (0x7 << ISL29035_DEVICE_ID_SHIFT)
 65 #define ISL29035_DEVICE_ID              0x5
 66 #define ISL29035_BOUT_SHIFT             0x07
 67 #define ISL29035_BOUT_MASK              (0x01 << ISL29035_BOUT_SHIFT)
 68 
 69 #define ISL29018_INT_TIME_AVAIL         "0.090000 0.005630 0.000351 0.000021"
 70 #define ISL29023_INT_TIME_AVAIL         "0.090000 0.005600 0.000352 0.000022"
 71 #define ISL29035_INT_TIME_AVAIL         "0.105000 0.006500 0.000410 0.000025"
 72 
 73 static const char * const int_time_avail[] = {
 74         ISL29018_INT_TIME_AVAIL,
 75         ISL29023_INT_TIME_AVAIL,
 76         ISL29035_INT_TIME_AVAIL,
 77 };
 78 
 79 enum isl29018_int_time {
 80         ISL29018_INT_TIME_16,
 81         ISL29018_INT_TIME_12,
 82         ISL29018_INT_TIME_8,
 83         ISL29018_INT_TIME_4,
 84 };
 85 
 86 static const unsigned int isl29018_int_utimes[3][4] = {
 87         {90000, 5630, 351, 21},
 88         {90000, 5600, 352, 22},
 89         {105000, 6500, 410, 25},
 90 };
 91 
 92 static const struct isl29018_scale {
 93         unsigned int scale;
 94         unsigned int uscale;
 95 } isl29018_scales[4][4] = {
 96         { {0, 15258}, {0, 61035}, {0, 244140}, {0, 976562} },
 97         { {0, 244140}, {0, 976562}, {3, 906250}, {15, 625000} },
 98         { {3, 906250}, {15, 625000}, {62, 500000}, {250, 0} },
 99         { {62, 500000}, {250, 0}, {1000, 0}, {4000, 0} }
100 };
101 
102 struct isl29018_chip {
103         struct device           *dev;
104         struct regmap           *regmap;
105         struct mutex            lock;
106         int                     type;
107         unsigned int            calibscale;
108         unsigned int            ucalibscale;
109         unsigned int            int_time;
110         struct isl29018_scale   scale;
111         int                     prox_scheme;
112         bool                    suspended;
113 };
114 
115 static int isl29018_set_integration_time(struct isl29018_chip *chip,
116                                          unsigned int utime)
117 {
118         int i, ret;
119         unsigned int int_time, new_int_time;
120 
121         for (i = 0; i < ARRAY_SIZE(isl29018_int_utimes[chip->type]); ++i) {
122                 if (utime == isl29018_int_utimes[chip->type][i]) {
123                         new_int_time = i;
124                         break;
125                 }
126         }
127 
128         if (i >= ARRAY_SIZE(isl29018_int_utimes[chip->type]))
129                 return -EINVAL;
130 
131         ret = regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII,
132                                  COMMANDII_RESOLUTION_MASK,
133                                  i << COMMANDII_RESOLUTION_SHIFT);
134         if (ret < 0)
135                 return ret;
136 
137         /* keep the same range when integration time changes */
138         int_time = chip->int_time;
139         for (i = 0; i < ARRAY_SIZE(isl29018_scales[int_time]); ++i) {
140                 if (chip->scale.scale == isl29018_scales[int_time][i].scale &&
141                     chip->scale.uscale == isl29018_scales[int_time][i].uscale) {
142                         chip->scale = isl29018_scales[new_int_time][i];
143                         break;
144                 }
145         }
146         chip->int_time = new_int_time;
147 
148         return 0;
149 }
150 
151 static int isl29018_set_scale(struct isl29018_chip *chip, int scale, int uscale)
152 {
153         int i, ret;
154         struct isl29018_scale new_scale;
155 
156         for (i = 0; i < ARRAY_SIZE(isl29018_scales[chip->int_time]); ++i) {
157                 if (scale == isl29018_scales[chip->int_time][i].scale &&
158                     uscale == isl29018_scales[chip->int_time][i].uscale) {
159                         new_scale = isl29018_scales[chip->int_time][i];
160                         break;
161                 }
162         }
163 
164         if (i >= ARRAY_SIZE(isl29018_scales[chip->int_time]))
165                 return -EINVAL;
166 
167         ret = regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII,
168                                  COMMANDII_RANGE_MASK,
169                                  i << COMMANDII_RANGE_SHIFT);
170         if (ret < 0)
171                 return ret;
172 
173         chip->scale = new_scale;
174 
175         return 0;
176 }
177 
178 static int isl29018_read_sensor_input(struct isl29018_chip *chip, int mode)
179 {
180         int status;
181         unsigned int lsb;
182         unsigned int msb;
183 
184         /* Set mode */
185         status = regmap_write(chip->regmap, ISL29018_REG_ADD_COMMAND1,
186                         mode << COMMMAND1_OPMODE_SHIFT);
187         if (status) {
188                 dev_err(chip->dev,
189                         "Error in setting operating mode err %d\n", status);
190                 return status;
191         }
192         msleep(CONVERSION_TIME_MS);
193         status = regmap_read(chip->regmap, ISL29018_REG_ADD_DATA_LSB, &lsb);
194         if (status < 0) {
195                 dev_err(chip->dev,
196                         "Error in reading LSB DATA with err %d\n", status);
197                 return status;
198         }
199 
200         status = regmap_read(chip->regmap, ISL29018_REG_ADD_DATA_MSB, &msb);
201         if (status < 0) {
202                 dev_err(chip->dev,
203                         "Error in reading MSB DATA with error %d\n", status);
204                 return status;
205         }
206         dev_vdbg(chip->dev, "MSB 0x%x and LSB 0x%x\n", msb, lsb);
207 
208         return (msb << 8) | lsb;
209 }
210 
211 static int isl29018_read_lux(struct isl29018_chip *chip, int *lux)
212 {
213         int lux_data;
214         unsigned int data_x_range;
215 
216         lux_data = isl29018_read_sensor_input(chip, COMMMAND1_OPMODE_ALS_ONCE);
217 
218         if (lux_data < 0)
219                 return lux_data;
220 
221         data_x_range = lux_data * chip->scale.scale +
222                        lux_data * chip->scale.uscale / 1000000;
223         *lux = data_x_range * chip->calibscale +
224                data_x_range * chip->ucalibscale / 1000000;
225 
226         return 0;
227 }
228 
229 static int isl29018_read_ir(struct isl29018_chip *chip, int *ir)
230 {
231         int ir_data;
232 
233         ir_data = isl29018_read_sensor_input(chip, COMMMAND1_OPMODE_IR_ONCE);
234 
235         if (ir_data < 0)
236                 return ir_data;
237 
238         *ir = ir_data;
239 
240         return 0;
241 }
242 
243 static int isl29018_read_proximity_ir(struct isl29018_chip *chip, int scheme,
244                 int *near_ir)
245 {
246         int status;
247         int prox_data = -1;
248         int ir_data = -1;
249 
250         /* Do proximity sensing with required scheme */
251         status = regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII,
252                         COMMANDII_SCHEME_MASK,
253                         scheme << COMMANDII_SCHEME_SHIFT);
254         if (status) {
255                 dev_err(chip->dev, "Error in setting operating mode\n");
256                 return status;
257         }
258 
259         prox_data = isl29018_read_sensor_input(chip,
260                                         COMMMAND1_OPMODE_PROX_ONCE);
261         if (prox_data < 0)
262                 return prox_data;
263 
264         if (scheme == 1) {
265                 *near_ir = prox_data;
266                 return 0;
267         }
268 
269         ir_data = isl29018_read_sensor_input(chip, COMMMAND1_OPMODE_IR_ONCE);
270 
271         if (ir_data < 0)
272                 return ir_data;
273 
274         if (prox_data >= ir_data)
275                 *near_ir = prox_data - ir_data;
276         else
277                 *near_ir = 0;
278 
279         return 0;
280 }
281 
282 static ssize_t show_scale_available(struct device *dev,
283                         struct device_attribute *attr, char *buf)
284 {
285         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
286         struct isl29018_chip *chip = iio_priv(indio_dev);
287         int i, len = 0;
288 
289         for (i = 0; i < ARRAY_SIZE(isl29018_scales[chip->int_time]); ++i)
290                 len += sprintf(buf + len, "%d.%06d ",
291                                isl29018_scales[chip->int_time][i].scale,
292                                isl29018_scales[chip->int_time][i].uscale);
293 
294         buf[len - 1] = '\n';
295 
296         return len;
297 }
298 
299 static ssize_t show_int_time_available(struct device *dev,
300                         struct device_attribute *attr, char *buf)
301 {
302         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
303         struct isl29018_chip *chip = iio_priv(indio_dev);
304         int i, len = 0;
305 
306         for (i = 0; i < ARRAY_SIZE(isl29018_int_utimes[chip->type]); ++i)
307                 len += sprintf(buf + len, "0.%06d ",
308                                isl29018_int_utimes[chip->type][i]);
309 
310         buf[len - 1] = '\n';
311 
312         return len;
313 }
314 
315 /* proximity scheme */
316 static ssize_t show_prox_infrared_suppression(struct device *dev,
317                         struct device_attribute *attr, char *buf)
318 {
319         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
320         struct isl29018_chip *chip = iio_priv(indio_dev);
321 
322         /* return the "proximity scheme" i.e. if the chip does on chip
323         infrared suppression (1 means perform on chip suppression) */
324         return sprintf(buf, "%d\n", chip->prox_scheme);
325 }
326 
327 static ssize_t store_prox_infrared_suppression(struct device *dev,
328                 struct device_attribute *attr, const char *buf, size_t count)
329 {
330         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
331         struct isl29018_chip *chip = iio_priv(indio_dev);
332         int val;
333 
334         if (kstrtoint(buf, 10, &val))
335                 return -EINVAL;
336         if (!(val == 0 || val == 1)) {
337                 dev_err(dev, "The mode is not supported\n");
338                 return -EINVAL;
339         }
340 
341         /* get the  "proximity scheme" i.e. if the chip does on chip
342         infrared suppression (1 means perform on chip suppression) */
343         mutex_lock(&chip->lock);
344         chip->prox_scheme = val;
345         mutex_unlock(&chip->lock);
346 
347         return count;
348 }
349 
350 /* Channel IO */
351 static int isl29018_write_raw(struct iio_dev *indio_dev,
352                               struct iio_chan_spec const *chan,
353                               int val,
354                               int val2,
355                               long mask)
356 {
357         struct isl29018_chip *chip = iio_priv(indio_dev);
358         int ret = -EINVAL;
359 
360         mutex_lock(&chip->lock);
361         switch (mask) {
362         case IIO_CHAN_INFO_CALIBSCALE:
363                 if (chan->type == IIO_LIGHT) {
364                         chip->calibscale = val;
365                         chip->ucalibscale = val2;
366                         ret = 0;
367                 }
368                 break;
369         case IIO_CHAN_INFO_INT_TIME:
370                 if (chan->type == IIO_LIGHT) {
371                         if (val) {
372                                 mutex_unlock(&chip->lock);
373                                 return -EINVAL;
374                         }
375                         ret = isl29018_set_integration_time(chip, val2);
376                 }
377                 break;
378         case IIO_CHAN_INFO_SCALE:
379                 if (chan->type == IIO_LIGHT)
380                         ret = isl29018_set_scale(chip, val, val2);
381                 break;
382         default:
383                 break;
384         }
385         mutex_unlock(&chip->lock);
386 
387         return ret;
388 }
389 
390 static int isl29018_read_raw(struct iio_dev *indio_dev,
391                              struct iio_chan_spec const *chan,
392                              int *val,
393                              int *val2,
394                              long mask)
395 {
396         int ret = -EINVAL;
397         struct isl29018_chip *chip = iio_priv(indio_dev);
398 
399         mutex_lock(&chip->lock);
400         if (chip->suspended) {
401                 mutex_unlock(&chip->lock);
402                 return -EBUSY;
403         }
404         switch (mask) {
405         case IIO_CHAN_INFO_RAW:
406         case IIO_CHAN_INFO_PROCESSED:
407                 switch (chan->type) {
408                 case IIO_LIGHT:
409                         ret = isl29018_read_lux(chip, val);
410                         break;
411                 case IIO_INTENSITY:
412                         ret = isl29018_read_ir(chip, val);
413                         break;
414                 case IIO_PROXIMITY:
415                         ret = isl29018_read_proximity_ir(chip,
416                                         chip->prox_scheme, val);
417                         break;
418                 default:
419                         break;
420                 }
421                 if (!ret)
422                         ret = IIO_VAL_INT;
423                 break;
424         case IIO_CHAN_INFO_INT_TIME:
425                 if (chan->type == IIO_LIGHT) {
426                         *val = 0;
427                         *val2 = isl29018_int_utimes[chip->type][chip->int_time];
428                         ret = IIO_VAL_INT_PLUS_MICRO;
429                 }
430                 break;
431         case IIO_CHAN_INFO_SCALE:
432                 if (chan->type == IIO_LIGHT) {
433                         *val = chip->scale.scale;
434                         *val2 = chip->scale.uscale;
435                         ret = IIO_VAL_INT_PLUS_MICRO;
436                 }
437                 break;
438         case IIO_CHAN_INFO_CALIBSCALE:
439                 if (chan->type == IIO_LIGHT) {
440                         *val = chip->calibscale;
441                         *val2 = chip->ucalibscale;
442                         ret = IIO_VAL_INT_PLUS_MICRO;
443                 }
444                 break;
445         default:
446                 break;
447         }
448         mutex_unlock(&chip->lock);
449         return ret;
450 }
451 
452 #define ISL29018_LIGHT_CHANNEL {                                        \
453         .type = IIO_LIGHT,                                              \
454         .indexed = 1,                                                   \
455         .channel = 0,                                                   \
456         .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |            \
457         BIT(IIO_CHAN_INFO_CALIBSCALE) |                                 \
458         BIT(IIO_CHAN_INFO_SCALE) |                                      \
459         BIT(IIO_CHAN_INFO_INT_TIME),                                    \
460 }
461 
462 #define ISL29018_IR_CHANNEL {                                           \
463         .type = IIO_INTENSITY,                                          \
464         .modified = 1,                                                  \
465         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),                   \
466         .channel2 = IIO_MOD_LIGHT_IR,                                   \
467 }
468 
469 #define ISL29018_PROXIMITY_CHANNEL {                                    \
470         .type = IIO_PROXIMITY,                                          \
471         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),                   \
472 }
473 
474 static const struct iio_chan_spec isl29018_channels[] = {
475         ISL29018_LIGHT_CHANNEL,
476         ISL29018_IR_CHANNEL,
477         ISL29018_PROXIMITY_CHANNEL,
478 };
479 
480 static const struct iio_chan_spec isl29023_channels[] = {
481         ISL29018_LIGHT_CHANNEL,
482         ISL29018_IR_CHANNEL,
483 };
484 
485 static IIO_DEVICE_ATTR(in_illuminance_integration_time_available, S_IRUGO,
486                        show_int_time_available, NULL, 0);
487 static IIO_DEVICE_ATTR(in_illuminance_scale_available, S_IRUGO,
488                       show_scale_available, NULL, 0);
489 static IIO_DEVICE_ATTR(proximity_on_chip_ambient_infrared_suppression,
490                                         S_IRUGO | S_IWUSR,
491                                         show_prox_infrared_suppression,
492                                         store_prox_infrared_suppression, 0);
493 
494 #define ISL29018_DEV_ATTR(name) (&iio_dev_attr_##name.dev_attr.attr)
495 
496 static struct attribute *isl29018_attributes[] = {
497         ISL29018_DEV_ATTR(in_illuminance_scale_available),
498         ISL29018_DEV_ATTR(in_illuminance_integration_time_available),
499         ISL29018_DEV_ATTR(proximity_on_chip_ambient_infrared_suppression),
500         NULL
501 };
502 
503 static struct attribute *isl29023_attributes[] = {
504         ISL29018_DEV_ATTR(in_illuminance_scale_available),
505         ISL29018_DEV_ATTR(in_illuminance_integration_time_available),
506         NULL
507 };
508 
509 static const struct attribute_group isl29018_group = {
510         .attrs = isl29018_attributes,
511 };
512 
513 static const struct attribute_group isl29023_group = {
514         .attrs = isl29023_attributes,
515 };
516 
517 static int isl29035_detect(struct isl29018_chip *chip)
518 {
519         int status;
520         unsigned int id;
521 
522         status = regmap_read(chip->regmap, ISL29035_REG_DEVICE_ID, &id);
523         if (status < 0) {
524                 dev_err(chip->dev,
525                         "Error reading ID register with error %d\n",
526                         status);
527                 return status;
528         }
529 
530         id = (id & ISL29035_DEVICE_ID_MASK) >> ISL29035_DEVICE_ID_SHIFT;
531 
532         if (id != ISL29035_DEVICE_ID)
533                 return -ENODEV;
534 
535         /* clear out brownout bit */
536         return regmap_update_bits(chip->regmap, ISL29035_REG_DEVICE_ID,
537                                   ISL29035_BOUT_MASK, 0);
538 }
539 
540 enum {
541         isl29018,
542         isl29023,
543         isl29035,
544 };
545 
546 static int isl29018_chip_init(struct isl29018_chip *chip)
547 {
548         int status;
549 
550         if (chip->type == isl29035) {
551                 status = isl29035_detect(chip);
552                 if (status < 0)
553                         return status;
554         }
555 
556         /* Code added per Intersil Application Note 1534:
557          *     When VDD sinks to approximately 1.8V or below, some of
558          * the part's registers may change their state. When VDD
559          * recovers to 2.25V (or greater), the part may thus be in an
560          * unknown mode of operation. The user can return the part to
561          * a known mode of operation either by (a) setting VDD = 0V for
562          * 1 second or more and then powering back up with a slew rate
563          * of 0.5V/ms or greater, or (b) via I2C disable all ALS/PROX
564          * conversions, clear the test registers, and then rewrite all
565          * registers to the desired values.
566          * ...
567          * FOR ISL29011, ISL29018, ISL29021, ISL29023
568          * 1. Write 0x00 to register 0x08 (TEST)
569          * 2. Write 0x00 to register 0x00 (CMD1)
570          * 3. Rewrite all registers to the desired values
571          *
572          * ISL29018 Data Sheet (FN6619.1, Feb 11, 2010) essentially says
573          * the same thing EXCEPT the data sheet asks for a 1ms delay after
574          * writing the CMD1 register.
575          */
576         status = regmap_write(chip->regmap, ISL29018_REG_TEST, 0x0);
577         if (status < 0) {
578                 dev_err(chip->dev, "Failed to clear isl29018 TEST reg.(%d)\n",
579                         status);
580                 return status;
581         }
582 
583         /* See Intersil AN1534 comments above.
584          * "Operating Mode" (COMMAND1) register is reprogrammed when
585          * data is read from the device.
586          */
587         status = regmap_write(chip->regmap, ISL29018_REG_ADD_COMMAND1, 0);
588         if (status < 0) {
589                 dev_err(chip->dev, "Failed to clear isl29018 CMD1 reg.(%d)\n",
590                         status);
591                 return status;
592         }
593 
594         usleep_range(1000, 2000);       /* per data sheet, page 10 */
595 
596         /* set defaults */
597         status = isl29018_set_scale(chip, chip->scale.scale,
598                                     chip->scale.uscale);
599         if (status < 0) {
600                 dev_err(chip->dev, "Init of isl29018 fails\n");
601                 return status;
602         }
603 
604         status = isl29018_set_integration_time(chip,
605                         isl29018_int_utimes[chip->type][chip->int_time]);
606         if (status < 0) {
607                 dev_err(chip->dev, "Init of isl29018 fails\n");
608                 return status;
609         }
610 
611         return 0;
612 }
613 
614 static const struct iio_info isl29018_info = {
615         .attrs = &isl29018_group,
616         .driver_module = THIS_MODULE,
617         .read_raw = &isl29018_read_raw,
618         .write_raw = &isl29018_write_raw,
619 };
620 
621 static const struct iio_info isl29023_info = {
622         .attrs = &isl29023_group,
623         .driver_module = THIS_MODULE,
624         .read_raw = &isl29018_read_raw,
625         .write_raw = &isl29018_write_raw,
626 };
627 
628 static bool is_volatile_reg(struct device *dev, unsigned int reg)
629 {
630         switch (reg) {
631         case ISL29018_REG_ADD_DATA_LSB:
632         case ISL29018_REG_ADD_DATA_MSB:
633         case ISL29018_REG_ADD_COMMAND1:
634         case ISL29018_REG_TEST:
635         case ISL29035_REG_DEVICE_ID:
636                 return true;
637         default:
638                 return false;
639         }
640 }
641 
642 /*
643  * isl29018_regmap_config: regmap configuration.
644  * Use RBTREE mechanism for caching.
645  */
646 static const struct regmap_config isl29018_regmap_config = {
647         .reg_bits = 8,
648         .val_bits = 8,
649         .volatile_reg = is_volatile_reg,
650         .max_register = ISL29018_REG_TEST,
651         .num_reg_defaults_raw = ISL29018_REG_TEST + 1,
652         .cache_type = REGCACHE_RBTREE,
653 };
654 
655 /* isl29035_regmap_config: regmap configuration for ISL29035 */
656 static const struct regmap_config isl29035_regmap_config = {
657         .reg_bits = 8,
658         .val_bits = 8,
659         .volatile_reg = is_volatile_reg,
660         .max_register = ISL29035_REG_DEVICE_ID,
661         .num_reg_defaults_raw = ISL29035_REG_DEVICE_ID + 1,
662         .cache_type = REGCACHE_RBTREE,
663 };
664 
665 struct chip_info {
666         const struct iio_chan_spec *channels;
667         int num_channels;
668         const struct iio_info *indio_info;
669         const struct regmap_config *regmap_cfg;
670 };
671 
672 static const struct chip_info chip_info_tbl[] = {
673         [isl29018] = {
674                 .channels = isl29018_channels,
675                 .num_channels = ARRAY_SIZE(isl29018_channels),
676                 .indio_info = &isl29018_info,
677                 .regmap_cfg = &isl29018_regmap_config,
678         },
679         [isl29023] = {
680                 .channels = isl29023_channels,
681                 .num_channels = ARRAY_SIZE(isl29023_channels),
682                 .indio_info = &isl29023_info,
683                 .regmap_cfg = &isl29018_regmap_config,
684         },
685         [isl29035] = {
686                 .channels = isl29023_channels,
687                 .num_channels = ARRAY_SIZE(isl29023_channels),
688                 .indio_info = &isl29023_info,
689                 .regmap_cfg = &isl29035_regmap_config,
690         },
691 };
692 
693 static const char *isl29018_match_acpi_device(struct device *dev, int *data)
694 {
695         const struct acpi_device_id *id;
696 
697         id = acpi_match_device(dev->driver->acpi_match_table, dev);
698 
699         if (!id)
700                 return NULL;
701 
702         *data = (int) id->driver_data;
703 
704         return dev_name(dev);
705 }
706 
707 static int isl29018_probe(struct i2c_client *client,
708                          const struct i2c_device_id *id)
709 {
710         struct isl29018_chip *chip;
711         struct iio_dev *indio_dev;
712         int err;
713         const char *name = NULL;
714         int dev_id = 0;
715 
716         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
717         if (!indio_dev) {
718                 dev_err(&client->dev, "iio allocation fails\n");
719                 return -ENOMEM;
720         }
721         chip = iio_priv(indio_dev);
722 
723         i2c_set_clientdata(client, indio_dev);
724         chip->dev = &client->dev;
725 
726         if (id) {
727                 name = id->name;
728                 dev_id = id->driver_data;
729         }
730 
731         if (ACPI_HANDLE(&client->dev))
732                 name = isl29018_match_acpi_device(&client->dev, &dev_id);
733 
734         mutex_init(&chip->lock);
735 
736         chip->type = dev_id;
737         chip->calibscale = 1;
738         chip->ucalibscale = 0;
739         chip->int_time = ISL29018_INT_TIME_16;
740         chip->scale = isl29018_scales[chip->int_time][0];
741         chip->suspended = false;
742 
743         chip->regmap = devm_regmap_init_i2c(client,
744                                 chip_info_tbl[dev_id].regmap_cfg);
745         if (IS_ERR(chip->regmap)) {
746                 err = PTR_ERR(chip->regmap);
747                 dev_err(chip->dev, "regmap initialization failed: %d\n", err);
748                 return err;
749         }
750 
751         err = isl29018_chip_init(chip);
752         if (err)
753                 return err;
754 
755         indio_dev->info = chip_info_tbl[dev_id].indio_info;
756         indio_dev->channels = chip_info_tbl[dev_id].channels;
757         indio_dev->num_channels = chip_info_tbl[dev_id].num_channels;
758         indio_dev->name = name;
759         indio_dev->dev.parent = &client->dev;
760         indio_dev->modes = INDIO_DIRECT_MODE;
761         err = devm_iio_device_register(&client->dev, indio_dev);
762         if (err) {
763                 dev_err(&client->dev, "iio registration fails\n");
764                 return err;
765         }
766 
767         return 0;
768 }
769 
770 #ifdef CONFIG_PM_SLEEP
771 static int isl29018_suspend(struct device *dev)
772 {
773         struct isl29018_chip *chip = iio_priv(dev_get_drvdata(dev));
774 
775         mutex_lock(&chip->lock);
776 
777         /* Since this driver uses only polling commands, we are by default in
778          * auto shutdown (ie, power-down) mode.
779          * So we do not have much to do here.
780          */
781         chip->suspended = true;
782 
783         mutex_unlock(&chip->lock);
784         return 0;
785 }
786 
787 static int isl29018_resume(struct device *dev)
788 {
789         struct isl29018_chip *chip = iio_priv(dev_get_drvdata(dev));
790         int err;
791 
792         mutex_lock(&chip->lock);
793 
794         err = isl29018_chip_init(chip);
795         if (!err)
796                 chip->suspended = false;
797 
798         mutex_unlock(&chip->lock);
799         return err;
800 }
801 
802 static SIMPLE_DEV_PM_OPS(isl29018_pm_ops, isl29018_suspend, isl29018_resume);
803 #define ISL29018_PM_OPS (&isl29018_pm_ops)
804 #else
805 #define ISL29018_PM_OPS NULL
806 #endif
807 
808 static const struct acpi_device_id isl29018_acpi_match[] = {
809         {"ISL29018", isl29018},
810         {"ISL29023", isl29023},
811         {"ISL29035", isl29035},
812         {},
813 };
814 MODULE_DEVICE_TABLE(acpi, isl29018_acpi_match);
815 
816 static const struct i2c_device_id isl29018_id[] = {
817         {"isl29018", isl29018},
818         {"isl29023", isl29023},
819         {"isl29035", isl29035},
820         {}
821 };
822 
823 MODULE_DEVICE_TABLE(i2c, isl29018_id);
824 
825 static const struct of_device_id isl29018_of_match[] = {
826         { .compatible = "isil,isl29018", },
827         { .compatible = "isil,isl29023", },
828         { .compatible = "isil,isl29035", },
829         { },
830 };
831 MODULE_DEVICE_TABLE(of, isl29018_of_match);
832 
833 static struct i2c_driver isl29018_driver = {
834         .class  = I2C_CLASS_HWMON,
835         .driver  = {
836                         .name = "isl29018",
837                         .acpi_match_table = ACPI_PTR(isl29018_acpi_match),
838                         .pm = ISL29018_PM_OPS,
839                         .of_match_table = isl29018_of_match,
840                     },
841         .probe   = isl29018_probe,
842         .id_table = isl29018_id,
843 };
844 module_i2c_driver(isl29018_driver);
845 
846 MODULE_DESCRIPTION("ISL29018 Ambient Light Sensor driver");
847 MODULE_LICENSE("GPL");
848 

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