kernel/drivers/iio/light/pa12203001.c

   1 /*
   2  * Copyright (c) 2015 Intel Corporation
   3  *
   4  * Driver for TXC PA12203001 Proximity and Ambient Light Sensor.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published by
   8  * the Free Software Foundation.
   9  * To do: Interrupt support.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/acpi.h>
  15 #include <linux/delay.h>
  16 #include <linux/i2c.h>
  17 #include <linux/iio/iio.h>
  18 #include <linux/iio/sysfs.h>
  19 #include <linux/mutex.h>
  20 #include <linux/pm.h>
  21 #include <linux/pm_runtime.h>
  22 #include <linux/regmap.h>
  23
  24 #define PA12203001_DRIVER_NAME  "pa12203001"
  25
  26 #define PA12203001_REG_CFG0             0x00
  27 #define PA12203001_REG_CFG1             0x01
  28 #define PA12203001_REG_CFG2             0x02
  29 #define PA12203001_REG_CFG3             0x03
  30
  31 #define PA12203001_REG_ADL              0x0b
  32 #define PA12203001_REG_PDH              0x0e
  33
  34 #define PA12203001_REG_POFS             0x10
  35 #define PA12203001_REG_PSET             0x11
  36
  37 #define PA12203001_ALS_EN_MASK          BIT(0)
  38 #define PA12203001_PX_EN_MASK           BIT(1)
  39 #define PA12203001_PX_NORMAL_MODE_MASK          GENMASK(7, 6)
  40 #define PA12203001_AFSR_MASK            GENMASK(5, 4)
  41 #define PA12203001_AFSR_SHIFT           4
  42
  43 #define PA12203001_PSCAN                        0x03
  44
  45 /* als range 31000, ps, als disabled */
  46 #define PA12203001_REG_CFG0_DEFAULT             0x30
  47
  48 /* led current: 100 mA */
  49 #define PA12203001_REG_CFG1_DEFAULT             0x20
  50
  51 /* ps mode: normal, interrupts not active */
  52 #define PA12203001_REG_CFG2_DEFAULT             0xcc
  53
  54 #define PA12203001_REG_CFG3_DEFAULT             0x00
  55
  56 #define PA12203001_SLEEP_DELAY_MS               3000
  57
  58 #define PA12203001_CHIP_ENABLE          0xff
  59 #define PA12203001_CHIP_DISABLE         0x00
  60
  61 /* available scales: corresponding to [500, 4000, 7000, 31000]  lux */
  62 static const int pa12203001_scales[] = { 7629, 61036, 106813, 473029};
  63
  64 struct pa12203001_data {
  65         struct i2c_client *client;
  66
  67         /* protect device states */
  68         struct mutex lock;
  69
  70         bool als_enabled;
  71         bool px_enabled;
  72         bool als_needs_enable;
  73         bool px_needs_enable;
  74
  75         struct regmap *map;
  76 };
  77
  78 static const struct {
  79         u8 reg;
  80         u8 val;
  81 } regvals[] = {
  82         {PA12203001_REG_CFG0, PA12203001_REG_CFG0_DEFAULT},
  83         {PA12203001_REG_CFG1, PA12203001_REG_CFG1_DEFAULT},
  84         {PA12203001_REG_CFG2, PA12203001_REG_CFG2_DEFAULT},
  85         {PA12203001_REG_CFG3, PA12203001_REG_CFG3_DEFAULT},
  86         {PA12203001_REG_PSET, PA12203001_PSCAN},
  87 };
  88
  89 static IIO_CONST_ATTR(in_illuminance_scale_available,
  90                       "0.007629 0.061036 0.106813 0.473029");
  91
  92 static struct attribute *pa12203001_attrs[] = {
  93         &iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
  94         NULL
  95 };
  96
  97 static const struct attribute_group pa12203001_attr_group = {
  98         .attrs = pa12203001_attrs,
  99 };
 100
 101 static const struct iio_chan_spec pa12203001_channels[] = {
 102         {
 103                 .type = IIO_LIGHT,
 104                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 105                                       BIT(IIO_CHAN_INFO_SCALE),
 106         },
 107         {
 108                 .type = IIO_PROXIMITY,
 109                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 110         }
 111 };
 112
 113 static const struct regmap_range pa12203001_volatile_regs_ranges[] = {
 114         regmap_reg_range(PA12203001_REG_ADL, PA12203001_REG_ADL + 1),
 115         regmap_reg_range(PA12203001_REG_PDH, PA12203001_REG_PDH),
 116 };
 117
 118 static const struct regmap_access_table pa12203001_volatile_regs = {
 119         .yes_ranges = pa12203001_volatile_regs_ranges,
 120         .n_yes_ranges = ARRAY_SIZE(pa12203001_volatile_regs_ranges),
 121 };
 122
 123 static const struct regmap_config pa12203001_regmap_config = {
 124         .reg_bits = 8,
 125         .val_bits = 8,
 126         .max_register = PA12203001_REG_PSET,
 127         .cache_type = REGCACHE_RBTREE,
 128         .volatile_table = &pa12203001_volatile_regs,
 129 };
 130
 131 static inline int pa12203001_als_enable(struct pa12203001_data *data, u8 enable)
 132 {
 133         int ret;
 134
 135         ret = regmap_update_bits(data->map, PA12203001_REG_CFG0,
 136                                  PA12203001_ALS_EN_MASK, enable);
 137         if (ret < 0)
 138                 return ret;
 139
 140         data->als_enabled = !!enable;
 141
 142         return 0;
 143 }
 144
 145 static inline int pa12203001_px_enable(struct pa12203001_data *data, u8 enable)
 146 {
 147         int ret;
 148
 149         ret = regmap_update_bits(data->map, PA12203001_REG_CFG0,
 150                                  PA12203001_PX_EN_MASK, enable);
 151         if (ret < 0)
 152                 return ret;
 153
 154         data->px_enabled = !!enable;
 155
 156         return 0;
 157 }
 158
 159 static int pa12203001_set_power_state(struct pa12203001_data *data, bool on,
 160                                       u8 mask)
 161 {
 162 #ifdef CONFIG_PM
 163         int ret;
 164
 165         if (on && (mask & PA12203001_ALS_EN_MASK)) {
 166                 mutex_lock(&data->lock);
 167                 if (data->px_enabled) {
 168                         ret = pa12203001_als_enable(data,
 169                                                     PA12203001_ALS_EN_MASK);
 170                         if (ret < 0)
 171                                 goto err;
 172                 } else {
 173                         data->als_needs_enable = true;
 174                 }
 175                 mutex_unlock(&data->lock);
 176         }
 177
 178         if (on && (mask & PA12203001_PX_EN_MASK)) {
 179                 mutex_lock(&data->lock);
 180                 if (data->als_enabled) {
 181                         ret = pa12203001_px_enable(data, PA12203001_PX_EN_MASK);
 182                         if (ret < 0)
 183                                 goto err;
 184                 } else {
 185                         data->px_needs_enable = true;
 186                 }
 187                 mutex_unlock(&data->lock);
 188         }
 189
 190         if (on) {
 191                 ret = pm_runtime_get_sync(&data->client->dev);
 192                 if (ret < 0)
 193                         pm_runtime_put_noidle(&data->client->dev);
 194
 195         } else {
 196                 pm_runtime_mark_last_busy(&data->client->dev);
 197                 ret = pm_runtime_put_autosuspend(&data->client->dev);
 198         }
 199
 200         return ret;
 201
 202 err:
 203         mutex_unlock(&data->lock);
 204         return ret;
 205
 206 #endif
 207         return 0;
 208 }
 209
 210 static int pa12203001_read_raw(struct iio_dev *indio_dev,
 211                                struct iio_chan_spec const *chan, int *val,
 212                                int *val2, long mask)
 213 {
 214         struct pa12203001_data *data = iio_priv(indio_dev);
 215         int ret;
 216         u8 dev_mask;
 217         unsigned int reg_byte;
 218         __le16 reg_word;
 219
 220         switch (mask) {
 221         case IIO_CHAN_INFO_RAW:
 222                 switch (chan->type) {
 223                 case IIO_LIGHT:
 224                         dev_mask = PA12203001_ALS_EN_MASK;
 225                         ret = pa12203001_set_power_state(data, true, dev_mask);
 226                         if (ret < 0)
 227                                 return ret;
 228                         /*
 229                          * ALS ADC value is stored in registers
 230                          * PA12203001_REG_ADL and in PA12203001_REG_ADL + 1.
 231                          */
 232                         ret = regmap_bulk_read(data->map, PA12203001_REG_ADL,
 233                                                &reg_word, 2);
 234                         if (ret < 0)
 235                                 goto reg_err;
 236
 237                         *val = le16_to_cpu(reg_word);
 238                         ret = pa12203001_set_power_state(data, false, dev_mask);
 239                         if (ret < 0)
 240                                 return ret;
 241                         break;
 242                 case IIO_PROXIMITY:
 243                         dev_mask = PA12203001_PX_EN_MASK;
 244                         ret = pa12203001_set_power_state(data, true, dev_mask);
 245                         if (ret < 0)
 246                                 return ret;
 247                         ret = regmap_read(data->map, PA12203001_REG_PDH,
 248                                           &reg_byte);
 249                         if (ret < 0)
 250                                 goto reg_err;
 251
 252                         *val = reg_byte;
 253                         ret = pa12203001_set_power_state(data, false, dev_mask);
 254                         if (ret < 0)
 255                                 return ret;
 256                         break;
 257                 default:
 258                         return -EINVAL;
 259                 }
 260                 return IIO_VAL_INT;
 261         case IIO_CHAN_INFO_SCALE:
 262                 ret = regmap_read(data->map, PA12203001_REG_CFG0, &reg_byte);
 263                 if (ret < 0)
 264                         return ret;
 265                 *val = 0;
 266                 reg_byte = (reg_byte & PA12203001_AFSR_MASK);
 267                 *val2 = pa12203001_scales[reg_byte >> 4];
 268                 return IIO_VAL_INT_PLUS_MICRO;
 269         default:
 270                 return -EINVAL;
 271         }
 272
 273 reg_err:
 274         pa12203001_set_power_state(data, false, dev_mask);
 275         return ret;
 276 }
 277
 278 static int pa12203001_write_raw(struct iio_dev *indio_dev,
 279                                 struct iio_chan_spec const *chan, int val,
 280                                 int val2, long mask)
 281 {
 282         struct pa12203001_data *data = iio_priv(indio_dev);
 283         int i, ret, new_val;
 284         unsigned int reg_byte;
 285
 286         switch (mask) {
 287         case IIO_CHAN_INFO_SCALE:
 288                 ret = regmap_read(data->map, PA12203001_REG_CFG0, &reg_byte);
 289                 if (val != 0 || ret < 0)
 290                         return -EINVAL;
 291                 for (i = 0; i < ARRAY_SIZE(pa12203001_scales); i++) {
 292                         if (val2 == pa12203001_scales[i]) {
 293                                 new_val = i << PA12203001_AFSR_SHIFT;
 294                                 return regmap_update_bits(data->map,
 295                                                           PA12203001_REG_CFG0,
 296                                                           PA12203001_AFSR_MASK,
 297                                                           new_val);
 298                         }
 299                 }
 300                 break;
 301         default:
 302                 break;
 303         }
 304
 305         return -EINVAL;
 306 }
 307
 308 static const struct iio_info pa12203001_info = {
 309         .driver_module  = THIS_MODULE,
 310         .read_raw = pa12203001_read_raw,
 311         .write_raw = pa12203001_write_raw,
 312         .attrs = &pa12203001_attr_group,
 313 };
 314
 315 static int pa12203001_init(struct iio_dev *indio_dev)
 316 {
 317         struct pa12203001_data *data = iio_priv(indio_dev);
 318         int i, ret;
 319
 320         for (i = 0; i < ARRAY_SIZE(regvals); i++) {
 321                 ret = regmap_write(data->map, regvals[i].reg, regvals[i].val);
 322                 if (ret < 0)
 323                         return ret;
 324         }
 325
 326         return 0;
 327 }
 328
 329 static int pa12203001_power_chip(struct iio_dev *indio_dev, u8 state)
 330 {
 331         struct pa12203001_data *data = iio_priv(indio_dev);
 332         int ret;
 333
 334         mutex_lock(&data->lock);
 335         ret = pa12203001_als_enable(data, state);
 336         if (ret < 0)
 337                 goto out;
 338
 339         ret = pa12203001_px_enable(data, state);
 340
 341 out:
 342         mutex_unlock(&data->lock);
 343         return ret;
 344 }
 345
 346 static int pa12203001_probe(struct i2c_client *client,
 347                             const struct i2c_device_id *id)
 348 {
 349         struct pa12203001_data *data;
 350         struct iio_dev *indio_dev;
 351         int ret;
 352
 353         indio_dev = devm_iio_device_alloc(&client->dev,
 354                                           sizeof(struct pa12203001_data));
 355         if (!indio_dev)
 356                 return -ENOMEM;
 357
 358         data = iio_priv(indio_dev);
 359         i2c_set_clientdata(client, indio_dev);
 360         data->client = client;
 361
 362         data->map = devm_regmap_init_i2c(client, &pa12203001_regmap_config);
 363         if (IS_ERR(data->map))
 364                 return PTR_ERR(data->map);
 365
 366         mutex_init(&data->lock);
 367
 368         indio_dev->dev.parent = &client->dev;
 369         indio_dev->info = &pa12203001_info;
 370         indio_dev->name = PA12203001_DRIVER_NAME;
 371         indio_dev->channels = pa12203001_channels;
 372         indio_dev->num_channels = ARRAY_SIZE(pa12203001_channels);
 373         indio_dev->modes = INDIO_DIRECT_MODE;
 374
 375         ret = pa12203001_init(indio_dev);
 376         if (ret < 0)
 377                 return ret;
 378
 379         ret = pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE);
 380         if (ret < 0)
 381                 return ret;
 382
 383         ret = pm_runtime_set_active(&client->dev);
 384         if (ret < 0) {
 385                 pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
 386                 return ret;
 387         }
 388
 389         pm_runtime_enable(&client->dev);
 390         pm_runtime_set_autosuspend_delay(&client->dev,
 391                                          PA12203001_SLEEP_DELAY_MS);
 392         pm_runtime_use_autosuspend(&client->dev);
 393
 394         return iio_device_register(indio_dev);
 395 }
 396
 397 static int pa12203001_remove(struct i2c_client *client)
 398 {
 399         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 400
 401         iio_device_unregister(indio_dev);
 402
 403         pm_runtime_disable(&client->dev);
 404         pm_runtime_set_suspended(&client->dev);
 405
 406         return pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
 407 }
 408
 409 #if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM)
 410 static int pa12203001_suspend(struct device *dev)
 411 {
 412         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 413
 414         return pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
 415 }
 416 #endif
 417
 418 #ifdef CONFIG_PM_SLEEP
 419 static int pa12203001_resume(struct device *dev)
 420 {
 421         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 422
 423         return pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE);
 424 }
 425 #endif
 426
 427 #ifdef CONFIG_PM
 428 static int pa12203001_runtime_resume(struct device *dev)
 429 {
 430         struct pa12203001_data *data;
 431
 432         data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 433
 434         mutex_lock(&data->lock);
 435         if (data->als_needs_enable) {
 436                 pa12203001_als_enable(data, PA12203001_ALS_EN_MASK);
 437                 data->als_needs_enable = false;
 438         }
 439         if (data->px_needs_enable) {
 440                 pa12203001_px_enable(data, PA12203001_PX_EN_MASK);
 441                 data->px_needs_enable = false;
 442         }
 443         mutex_unlock(&data->lock);
 444
 445         return 0;
 446 }
 447 #endif
 448
 449 static const struct dev_pm_ops pa12203001_pm_ops = {
 450         SET_SYSTEM_SLEEP_PM_OPS(pa12203001_suspend, pa12203001_resume)
 451         SET_RUNTIME_PM_OPS(pa12203001_suspend, pa12203001_runtime_resume, NULL)
 452 };
 453
 454 static const struct acpi_device_id pa12203001_acpi_match[] = {
 455         { "TXCPA122", 0},
 456         {}
 457 };
 458
 459 MODULE_DEVICE_TABLE(acpi, pa12203001_acpi_match);
 460
 461 static const struct i2c_device_id pa12203001_id[] = {
 462                 {"txcpa122", 0},
 463                 {}
 464 };
 465
 466 MODULE_DEVICE_TABLE(i2c, pa12203001_id);
 467
 468 static struct i2c_driver pa12203001_driver = {
 469         .driver = {
 470                 .name = PA12203001_DRIVER_NAME,
 471                 .pm = &pa12203001_pm_ops,
 472                 .acpi_match_table = ACPI_PTR(pa12203001_acpi_match),
 473         },
 474         .probe = pa12203001_probe,
 475         .remove = pa12203001_remove,
 476         .id_table = pa12203001_id,
 477
 478 };
 479 module_i2c_driver(pa12203001_driver);
 480
 481 MODULE_AUTHOR("Adriana Reus <adriana.reus@intel.com>");
 482 MODULE_DESCRIPTION("Driver for TXC PA12203001 Proximity and Light Sensor");
 483 MODULE_LICENSE("GPL v2");