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Linux/drivers/staging/iio/light/isl29028.c

  1 /*
  2  * IIO driver for the light sensor ISL29028.
  3  * ISL29028 is Concurrent Ambient Light and Proximity Sensor
  4  *
  5  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
  6  *
  7  * This program is free software; you can redistribute it and/or modify it
  8  * under the terms and conditions of the GNU General Public License,
  9  * version 2, as published by the Free Software Foundation.
 10  *
 11  * This program is distributed in the hope it will be useful, but WITHOUT
 12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 14  * more details.
 15  *
 16  * You should have received a copy of the GNU General Public License
 17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 18  */
 19 
 20 #include <linux/module.h>
 21 #include <linux/i2c.h>
 22 #include <linux/err.h>
 23 #include <linux/mutex.h>
 24 #include <linux/delay.h>
 25 #include <linux/slab.h>
 26 #include <linux/regmap.h>
 27 #include <linux/iio/iio.h>
 28 #include <linux/iio/sysfs.h>
 29 
 30 #define CONVERSION_TIME_MS              100
 31 
 32 #define ISL29028_REG_CONFIGURE          0x01
 33 
 34 #define CONFIGURE_ALS_IR_MODE_ALS       0
 35 #define CONFIGURE_ALS_IR_MODE_IR        BIT(0)
 36 #define CONFIGURE_ALS_IR_MODE_MASK      BIT(0)
 37 
 38 #define CONFIGURE_ALS_RANGE_LOW_LUX     0
 39 #define CONFIGURE_ALS_RANGE_HIGH_LUX    BIT(1)
 40 #define CONFIGURE_ALS_RANGE_MASK        BIT(1)
 41 
 42 #define CONFIGURE_ALS_DIS               0
 43 #define CONFIGURE_ALS_EN                BIT(2)
 44 #define CONFIGURE_ALS_EN_MASK           BIT(2)
 45 
 46 #define CONFIGURE_PROX_DRIVE            BIT(3)
 47 
 48 #define CONFIGURE_PROX_SLP_SH           4
 49 #define CONFIGURE_PROX_SLP_MASK         (7 << CONFIGURE_PROX_SLP_SH)
 50 
 51 #define CONFIGURE_PROX_EN               BIT(7)
 52 #define CONFIGURE_PROX_EN_MASK          BIT(7)
 53 
 54 #define ISL29028_REG_INTERRUPT          0x02
 55 
 56 #define ISL29028_REG_PROX_DATA          0x08
 57 #define ISL29028_REG_ALSIR_L            0x09
 58 #define ISL29028_REG_ALSIR_U            0x0A
 59 
 60 #define ISL29028_REG_TEST1_MODE         0x0E
 61 #define ISL29028_REG_TEST2_MODE         0x0F
 62 
 63 #define ISL29028_NUM_REGS               (ISL29028_REG_TEST2_MODE + 1)
 64 
 65 enum als_ir_mode {
 66         MODE_NONE = 0,
 67         MODE_ALS,
 68         MODE_IR
 69 };
 70 
 71 struct isl29028_chip {
 72         struct device           *dev;
 73         struct mutex            lock;
 74         struct regmap           *regmap;
 75 
 76         unsigned int            prox_sampling;
 77         bool                    enable_prox;
 78 
 79         int                     lux_scale;
 80         int                     als_ir_mode;
 81 };
 82 
 83 static int isl29028_set_proxim_sampling(struct isl29028_chip *chip,
 84                         unsigned int sampling)
 85 {
 86         static unsigned int prox_period[] = {800, 400, 200, 100, 75, 50, 12, 0};
 87         int sel;
 88         unsigned int period = DIV_ROUND_UP(1000, sampling);
 89 
 90         for (sel = 0; sel < ARRAY_SIZE(prox_period); ++sel) {
 91                 if (period >= prox_period[sel])
 92                         break;
 93         }
 94         return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
 95                         CONFIGURE_PROX_SLP_MASK, sel << CONFIGURE_PROX_SLP_SH);
 96 }
 97 
 98 static int isl29028_enable_proximity(struct isl29028_chip *chip, bool enable)
 99 {
100         int ret;
101         int val = 0;
102 
103         if (enable)
104                 val = CONFIGURE_PROX_EN;
105         ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
106                         CONFIGURE_PROX_EN_MASK, val);
107         if (ret < 0)
108                 return ret;
109 
110         /* Wait for conversion to be complete for first sample */
111         mdelay(DIV_ROUND_UP(1000, chip->prox_sampling));
112         return 0;
113 }
114 
115 static int isl29028_set_als_scale(struct isl29028_chip *chip, int lux_scale)
116 {
117         int val = (lux_scale == 2000) ? CONFIGURE_ALS_RANGE_HIGH_LUX :
118                                         CONFIGURE_ALS_RANGE_LOW_LUX;
119 
120         return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
121                 CONFIGURE_ALS_RANGE_MASK, val);
122 }
123 
124 static int isl29028_set_als_ir_mode(struct isl29028_chip *chip,
125         enum als_ir_mode mode)
126 {
127         int ret = 0;
128 
129         switch (mode) {
130         case MODE_ALS:
131                 ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
132                         CONFIGURE_ALS_IR_MODE_MASK, CONFIGURE_ALS_IR_MODE_ALS);
133                 if (ret < 0)
134                         return ret;
135 
136                 ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
137                         CONFIGURE_ALS_RANGE_MASK, CONFIGURE_ALS_RANGE_HIGH_LUX);
138                 break;
139 
140         case MODE_IR:
141                 ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
142                         CONFIGURE_ALS_IR_MODE_MASK, CONFIGURE_ALS_IR_MODE_IR);
143                 break;
144 
145         case MODE_NONE:
146                 return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
147                         CONFIGURE_ALS_EN_MASK, CONFIGURE_ALS_DIS);
148         }
149 
150         if (ret < 0)
151                 return ret;
152 
153         /* Enable the ALS/IR */
154         ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
155                         CONFIGURE_ALS_EN_MASK, CONFIGURE_ALS_EN);
156         if (ret < 0)
157                 return ret;
158 
159         /* Need to wait for conversion time if ALS/IR mode enabled */
160         mdelay(CONVERSION_TIME_MS);
161         return 0;
162 }
163 
164 static int isl29028_read_als_ir(struct isl29028_chip *chip, int *als_ir)
165 {
166         unsigned int lsb;
167         unsigned int msb;
168         int ret;
169 
170         ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_L, &lsb);
171         if (ret < 0) {
172                 dev_err(chip->dev,
173                         "Error in reading register ALSIR_L err %d\n", ret);
174                 return ret;
175         }
176 
177         ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_U, &msb);
178         if (ret < 0) {
179                 dev_err(chip->dev,
180                         "Error in reading register ALSIR_U err %d\n", ret);
181                 return ret;
182         }
183 
184         *als_ir = ((msb & 0xF) << 8) | (lsb & 0xFF);
185         return 0;
186 }
187 
188 static int isl29028_read_proxim(struct isl29028_chip *chip, int *prox)
189 {
190         unsigned int data;
191         int ret;
192 
193         ret = regmap_read(chip->regmap, ISL29028_REG_PROX_DATA, &data);
194         if (ret < 0) {
195                 dev_err(chip->dev, "Error in reading register %d, error %d\n",
196                                 ISL29028_REG_PROX_DATA, ret);
197                 return ret;
198         }
199         *prox = data;
200         return 0;
201 }
202 
203 static int isl29028_proxim_get(struct isl29028_chip *chip, int *prox_data)
204 {
205         int ret;
206 
207         if (!chip->enable_prox) {
208                 ret = isl29028_enable_proximity(chip, true);
209                 if (ret < 0)
210                         return ret;
211                 chip->enable_prox = true;
212         }
213         return isl29028_read_proxim(chip, prox_data);
214 }
215 
216 static int isl29028_als_get(struct isl29028_chip *chip, int *als_data)
217 {
218         int ret;
219         int als_ir_data;
220 
221         if (chip->als_ir_mode != MODE_ALS) {
222                 ret = isl29028_set_als_ir_mode(chip, MODE_ALS);
223                 if (ret < 0) {
224                         dev_err(chip->dev,
225                                 "Error in enabling ALS mode err %d\n", ret);
226                         return ret;
227                 }
228                 chip->als_ir_mode = MODE_ALS;
229         }
230 
231         ret = isl29028_read_als_ir(chip, &als_ir_data);
232         if (ret < 0)
233                 return ret;
234 
235         /*
236          * convert als data count to lux.
237          * if lux_scale = 125,  lux = count * 0.031
238          * if lux_scale = 2000, lux = count * 0.49
239          */
240         if (chip->lux_scale == 125)
241                 als_ir_data = (als_ir_data * 31) / 1000;
242         else
243                 als_ir_data = (als_ir_data * 49) / 100;
244 
245         *als_data = als_ir_data;
246         return 0;
247 }
248 
249 static int isl29028_ir_get(struct isl29028_chip *chip, int *ir_data)
250 {
251         int ret;
252 
253         if (chip->als_ir_mode != MODE_IR) {
254                 ret = isl29028_set_als_ir_mode(chip, MODE_IR);
255                 if (ret < 0) {
256                         dev_err(chip->dev,
257                                 "Error in enabling IR mode err %d\n", ret);
258                         return ret;
259                 }
260                 chip->als_ir_mode = MODE_IR;
261         }
262         return isl29028_read_als_ir(chip, ir_data);
263 }
264 
265 /* Channel IO */
266 static int isl29028_write_raw(struct iio_dev *indio_dev,
267              struct iio_chan_spec const *chan, int val, int val2, long mask)
268 {
269         struct isl29028_chip *chip = iio_priv(indio_dev);
270         int ret = -EINVAL;
271 
272         mutex_lock(&chip->lock);
273         switch (chan->type) {
274         case IIO_PROXIMITY:
275                 if (mask != IIO_CHAN_INFO_SAMP_FREQ) {
276                         dev_err(chip->dev,
277                                 "proximity: mask value 0x%08lx not supported\n",
278                                 mask);
279                         break;
280                 }
281                 if (val < 1 || val > 100) {
282                         dev_err(chip->dev,
283                                 "Samp_freq %d is not in range[1:100]\n", val);
284                         break;
285                 }
286                 ret = isl29028_set_proxim_sampling(chip, val);
287                 if (ret < 0) {
288                         dev_err(chip->dev,
289                                 "Setting proximity samp_freq fail, err %d\n",
290                                 ret);
291                         break;
292                 }
293                 chip->prox_sampling = val;
294                 break;
295 
296         case IIO_LIGHT:
297                 if (mask != IIO_CHAN_INFO_SCALE) {
298                         dev_err(chip->dev,
299                                 "light: mask value 0x%08lx not supported\n",
300                                 mask);
301                         break;
302                 }
303                 if ((val != 125) && (val != 2000)) {
304                         dev_err(chip->dev,
305                                 "lux scale %d is invalid [125, 2000]\n", val);
306                         break;
307                 }
308                 ret = isl29028_set_als_scale(chip, val);
309                 if (ret < 0) {
310                         dev_err(chip->dev,
311                                 "Setting lux scale fail with error %d\n", ret);
312                         break;
313                 }
314                 chip->lux_scale = val;
315                 break;
316 
317         default:
318                 dev_err(chip->dev, "Unsupported channel type\n");
319                 break;
320         }
321         mutex_unlock(&chip->lock);
322         return ret;
323 }
324 
325 static int isl29028_read_raw(struct iio_dev *indio_dev,
326              struct iio_chan_spec const *chan, int *val, int *val2, long mask)
327 {
328         struct isl29028_chip *chip = iio_priv(indio_dev);
329         int ret = -EINVAL;
330 
331         mutex_lock(&chip->lock);
332         switch (mask) {
333         case IIO_CHAN_INFO_RAW:
334         case IIO_CHAN_INFO_PROCESSED:
335                 switch (chan->type) {
336                 case IIO_LIGHT:
337                         ret = isl29028_als_get(chip, val);
338                         break;
339                 case IIO_INTENSITY:
340                         ret = isl29028_ir_get(chip, val);
341                         break;
342                 case IIO_PROXIMITY:
343                         ret = isl29028_proxim_get(chip, val);
344                         break;
345                 default:
346                         break;
347                 }
348                 if (ret < 0)
349                         break;
350                 ret = IIO_VAL_INT;
351                 break;
352 
353         case IIO_CHAN_INFO_SAMP_FREQ:
354                 if (chan->type != IIO_PROXIMITY)
355                         break;
356                 *val = chip->prox_sampling;
357                 ret = IIO_VAL_INT;
358                 break;
359 
360         case IIO_CHAN_INFO_SCALE:
361                 if (chan->type != IIO_LIGHT)
362                         break;
363                 *val = chip->lux_scale;
364                 ret = IIO_VAL_INT;
365                 break;
366 
367         default:
368                 dev_err(chip->dev, "mask value 0x%08lx not supported\n", mask);
369                 break;
370         }
371         mutex_unlock(&chip->lock);
372         return ret;
373 }
374 
375 static IIO_CONST_ATTR(in_proximity_sampling_frequency_available,
376                                 "1, 3, 5, 10, 13, 20, 83, 100");
377 static IIO_CONST_ATTR(in_illuminance_scale_available, "125, 2000");
378 
379 #define ISL29028_DEV_ATTR(name) (&iio_dev_attr_##name.dev_attr.attr)
380 #define ISL29028_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr)
381 static struct attribute *isl29028_attributes[] = {
382         ISL29028_CONST_ATTR(in_proximity_sampling_frequency_available),
383         ISL29028_CONST_ATTR(in_illuminance_scale_available),
384         NULL,
385 };
386 
387 static const struct attribute_group isl29108_group = {
388         .attrs = isl29028_attributes,
389 };
390 
391 static const struct iio_chan_spec isl29028_channels[] = {
392         {
393                 .type = IIO_LIGHT,
394                 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
395                 BIT(IIO_CHAN_INFO_SCALE),
396         }, {
397                 .type = IIO_INTENSITY,
398                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
399         }, {
400                 .type = IIO_PROXIMITY,
401                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
402                 BIT(IIO_CHAN_INFO_SAMP_FREQ),
403         }
404 };
405 
406 static const struct iio_info isl29028_info = {
407         .attrs = &isl29108_group,
408         .driver_module = THIS_MODULE,
409         .read_raw = &isl29028_read_raw,
410         .write_raw = &isl29028_write_raw,
411 };
412 
413 static int isl29028_chip_init(struct isl29028_chip *chip)
414 {
415         int ret;
416 
417         chip->enable_prox  = false;
418         chip->prox_sampling = 20;
419         chip->lux_scale = 2000;
420         chip->als_ir_mode = MODE_NONE;
421 
422         ret = regmap_write(chip->regmap, ISL29028_REG_TEST1_MODE, 0x0);
423         if (ret < 0) {
424                 dev_err(chip->dev, "%s(): write to reg %d failed, err = %d\n",
425                         __func__, ISL29028_REG_TEST1_MODE, ret);
426                 return ret;
427         }
428         ret = regmap_write(chip->regmap, ISL29028_REG_TEST2_MODE, 0x0);
429         if (ret < 0) {
430                 dev_err(chip->dev, "%s(): write to reg %d failed, err = %d\n",
431                         __func__, ISL29028_REG_TEST2_MODE, ret);
432                 return ret;
433         }
434 
435         ret = regmap_write(chip->regmap, ISL29028_REG_CONFIGURE, 0x0);
436         if (ret < 0) {
437                 dev_err(chip->dev, "%s(): write to reg %d failed, err = %d\n",
438                         __func__, ISL29028_REG_CONFIGURE, ret);
439                 return ret;
440         }
441 
442         ret = isl29028_set_proxim_sampling(chip, chip->prox_sampling);
443         if (ret < 0) {
444                 dev_err(chip->dev, "%s(): setting the proximity, err = %d\n",
445                         __func__, ret);
446                 return ret;
447         }
448 
449         ret = isl29028_set_als_scale(chip, chip->lux_scale);
450         if (ret < 0)
451                 dev_err(chip->dev, "%s(): setting als scale failed, err = %d\n",
452                         __func__, ret);
453         return ret;
454 }
455 
456 static bool is_volatile_reg(struct device *dev, unsigned int reg)
457 {
458         switch (reg) {
459         case ISL29028_REG_INTERRUPT:
460         case ISL29028_REG_PROX_DATA:
461         case ISL29028_REG_ALSIR_L:
462         case ISL29028_REG_ALSIR_U:
463                 return true;
464         default:
465                 return false;
466         }
467 }
468 
469 static const struct regmap_config isl29028_regmap_config = {
470         .reg_bits = 8,
471         .val_bits = 8,
472         .volatile_reg = is_volatile_reg,
473         .max_register = ISL29028_NUM_REGS - 1,
474         .num_reg_defaults_raw = ISL29028_NUM_REGS,
475         .cache_type = REGCACHE_RBTREE,
476 };
477 
478 static int isl29028_probe(struct i2c_client *client,
479         const struct i2c_device_id *id)
480 {
481         struct isl29028_chip *chip;
482         struct iio_dev *indio_dev;
483         int ret;
484 
485         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
486         if (!indio_dev) {
487                 dev_err(&client->dev, "iio allocation fails\n");
488                 return -ENOMEM;
489         }
490 
491         chip = iio_priv(indio_dev);
492 
493         i2c_set_clientdata(client, indio_dev);
494         chip->dev = &client->dev;
495         mutex_init(&chip->lock);
496 
497         chip->regmap = devm_regmap_init_i2c(client, &isl29028_regmap_config);
498         if (IS_ERR(chip->regmap)) {
499                 ret = PTR_ERR(chip->regmap);
500                 dev_err(chip->dev, "regmap initialization failed: %d\n", ret);
501                 return ret;
502         }
503 
504         ret = isl29028_chip_init(chip);
505         if (ret < 0) {
506                 dev_err(chip->dev, "chip initialization failed: %d\n", ret);
507                 return ret;
508         }
509 
510         indio_dev->info = &isl29028_info;
511         indio_dev->channels = isl29028_channels;
512         indio_dev->num_channels = ARRAY_SIZE(isl29028_channels);
513         indio_dev->name = id->name;
514         indio_dev->dev.parent = &client->dev;
515         indio_dev->modes = INDIO_DIRECT_MODE;
516         ret = iio_device_register(indio_dev);
517         if (ret < 0) {
518                 dev_err(chip->dev, "iio registration fails with error %d\n",
519                         ret);
520                 return ret;
521         }
522         return 0;
523 }
524 
525 static int isl29028_remove(struct i2c_client *client)
526 {
527         struct iio_dev *indio_dev = i2c_get_clientdata(client);
528 
529         iio_device_unregister(indio_dev);
530         return 0;
531 }
532 
533 static const struct i2c_device_id isl29028_id[] = {
534         {"isl29028", 0},
535         {}
536 };
537 MODULE_DEVICE_TABLE(i2c, isl29028_id);
538 
539 static const struct of_device_id isl29028_of_match[] = {
540         { .compatible = "isil,isl29028", },
541         { },
542 };
543 MODULE_DEVICE_TABLE(of, isl29028_of_match);
544 
545 static struct i2c_driver isl29028_driver = {
546         .class  = I2C_CLASS_HWMON,
547         .driver  = {
548                 .name = "isl29028",
549                 .owner = THIS_MODULE,
550                 .of_match_table = isl29028_of_match,
551         },
552         .probe   = isl29028_probe,
553         .remove  = isl29028_remove,
554         .id_table = isl29028_id,
555 };
556 
557 module_i2c_driver(isl29028_driver);
558 
559 MODULE_DESCRIPTION("ISL29028 Ambient Light and Proximity Sensor driver");
560 MODULE_LICENSE("GPL v2");
561 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
562 

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