drivers/iio/light/jsa1212.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * JSA1212 Ambient Light & Proximity Sensor Driver
   4  *
   5  * Copyright (c) 2014, Intel Corporation.
   6  *
   7  * JSA1212 I2C slave address: 0x44(ADDR tied to GND), 0x45(ADDR tied to VDD)
   8  *
   9  * TODO: Interrupt support, thresholds, range support.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/slab.h>
  14 #include <linux/module.h>
  15 #include <linux/delay.h>
  16 #include <linux/i2c.h>
  17 #include <linux/mutex.h>
  18 #include <linux/acpi.h>
  19 #include <linux/regmap.h>
  20 #include <linux/iio/iio.h>
  21 #include <linux/iio/sysfs.h>
  22
  23 /* JSA1212 reg address */
  24 #define JSA1212_CONF_REG                0x01
  25 #define JSA1212_INT_REG                 0x02
  26 #define JSA1212_PXS_LT_REG              0x03
  27 #define JSA1212_PXS_HT_REG              0x04
  28 #define JSA1212_ALS_TH1_REG             0x05
  29 #define JSA1212_ALS_TH2_REG             0x06
  30 #define JSA1212_ALS_TH3_REG             0x07
  31 #define JSA1212_PXS_DATA_REG            0x08
  32 #define JSA1212_ALS_DT1_REG             0x09
  33 #define JSA1212_ALS_DT2_REG             0x0A
  34 #define JSA1212_ALS_RNG_REG             0x0B
  35 #define JSA1212_MAX_REG                 0x0C
  36
  37 /* JSA1212 reg masks */
  38 #define JSA1212_CONF_MASK               0xFF
  39 #define JSA1212_INT_MASK                0xFF
  40 #define JSA1212_PXS_LT_MASK             0xFF
  41 #define JSA1212_PXS_HT_MASK             0xFF
  42 #define JSA1212_ALS_TH1_MASK            0xFF
  43 #define JSA1212_ALS_TH2_LT_MASK         0x0F
  44 #define JSA1212_ALS_TH2_HT_MASK         0xF0
  45 #define JSA1212_ALS_TH3_MASK            0xFF
  46 #define JSA1212_PXS_DATA_MASK           0xFF
  47 #define JSA1212_ALS_DATA_MASK           0x0FFF
  48 #define JSA1212_ALS_DT1_MASK            0xFF
  49 #define JSA1212_ALS_DT2_MASK            0x0F
  50 #define JSA1212_ALS_RNG_MASK            0x07
  51
  52 /* JSA1212 CONF REG bits */
  53 #define JSA1212_CONF_PXS_MASK           0x80
  54 #define JSA1212_CONF_PXS_ENABLE         0x80
  55 #define JSA1212_CONF_PXS_DISABLE        0x00
  56 #define JSA1212_CONF_ALS_MASK           0x04
  57 #define JSA1212_CONF_ALS_ENABLE         0x04
  58 #define JSA1212_CONF_ALS_DISABLE        0x00
  59 #define JSA1212_CONF_IRDR_MASK          0x08
  60 /* Proxmity sensing IRDR current sink settings */
  61 #define JSA1212_CONF_IRDR_200MA         0x08
  62 #define JSA1212_CONF_IRDR_100MA         0x00
  63 #define JSA1212_CONF_PXS_SLP_MASK       0x70
  64 #define JSA1212_CONF_PXS_SLP_0MS        0x70
  65 #define JSA1212_CONF_PXS_SLP_12MS       0x60
  66 #define JSA1212_CONF_PXS_SLP_50MS       0x50
  67 #define JSA1212_CONF_PXS_SLP_75MS       0x40
  68 #define JSA1212_CONF_PXS_SLP_100MS      0x30
  69 #define JSA1212_CONF_PXS_SLP_200MS      0x20
  70 #define JSA1212_CONF_PXS_SLP_400MS      0x10
  71 #define JSA1212_CONF_PXS_SLP_800MS      0x00
  72
  73 /* JSA1212 INT REG bits */
  74 #define JSA1212_INT_CTRL_MASK           0x01
  75 #define JSA1212_INT_CTRL_EITHER         0x00
  76 #define JSA1212_INT_CTRL_BOTH           0x01
  77 #define JSA1212_INT_ALS_PRST_MASK       0x06
  78 #define JSA1212_INT_ALS_PRST_1CONV      0x00
  79 #define JSA1212_INT_ALS_PRST_4CONV      0x02
  80 #define JSA1212_INT_ALS_PRST_8CONV      0x04
  81 #define JSA1212_INT_ALS_PRST_16CONV     0x06
  82 #define JSA1212_INT_ALS_FLAG_MASK       0x08
  83 #define JSA1212_INT_ALS_FLAG_CLR        0x00
  84 #define JSA1212_INT_PXS_PRST_MASK       0x60
  85 #define JSA1212_INT_PXS_PRST_1CONV      0x00
  86 #define JSA1212_INT_PXS_PRST_4CONV      0x20
  87 #define JSA1212_INT_PXS_PRST_8CONV      0x40
  88 #define JSA1212_INT_PXS_PRST_16CONV     0x60
  89 #define JSA1212_INT_PXS_FLAG_MASK       0x80
  90 #define JSA1212_INT_PXS_FLAG_CLR        0x00
  91
  92 /* JSA1212 ALS RNG REG bits */
  93 #define JSA1212_ALS_RNG_0_2048          0x00
  94 #define JSA1212_ALS_RNG_0_1024          0x01
  95 #define JSA1212_ALS_RNG_0_512           0x02
  96 #define JSA1212_ALS_RNG_0_256           0x03
  97 #define JSA1212_ALS_RNG_0_128           0x04
  98
  99 /* JSA1212 INT threshold range */
 100 #define JSA1212_ALS_TH_MIN      0x0000
 101 #define JSA1212_ALS_TH_MAX      0x0FFF
 102 #define JSA1212_PXS_TH_MIN      0x00
 103 #define JSA1212_PXS_TH_MAX      0xFF
 104
 105 #define JSA1212_ALS_DELAY_MS    200
 106 #define JSA1212_PXS_DELAY_MS    100
 107
 108 #define JSA1212_DRIVER_NAME     "jsa1212"
 109 #define JSA1212_REGMAP_NAME     "jsa1212_regmap"
 110
 111 enum jsa1212_op_mode {
 112         JSA1212_OPMODE_ALS_EN,
 113         JSA1212_OPMODE_PXS_EN,
 114 };
 115
 116 struct jsa1212_data {
 117         struct i2c_client *client;
 118         struct mutex lock;
 119         u8 als_rng_idx;
 120         bool als_en; /* ALS enable status */
 121         bool pxs_en; /* proximity enable status */
 122         struct regmap *regmap;
 123 };
 124
 125 /* ALS range idx to val mapping */
 126 static const int jsa1212_als_range_val[] = {2048, 1024, 512, 256, 128,
 127                                                 128, 128, 128};
 128
 129 /* Enables or disables ALS function based on status */
 130 static int jsa1212_als_enable(struct jsa1212_data *data, u8 status)
 131 {
 132         int ret;
 133
 134         ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
 135                                 JSA1212_CONF_ALS_MASK,
 136                                 status);
 137         if (ret < 0)
 138                 return ret;
 139
 140         data->als_en = !!status;
 141
 142         return 0;
 143 }
 144
 145 /* Enables or disables PXS function based on status */
 146 static int jsa1212_pxs_enable(struct jsa1212_data *data, u8 status)
 147 {
 148         int ret;
 149
 150         ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
 151                                 JSA1212_CONF_PXS_MASK,
 152                                 status);
 153         if (ret < 0)
 154                 return ret;
 155
 156         data->pxs_en = !!status;
 157
 158         return 0;
 159 }
 160
 161 static int jsa1212_read_als_data(struct jsa1212_data *data,
 162                                 unsigned int *val)
 163 {
 164         int ret;
 165         __le16 als_data;
 166
 167         ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
 168         if (ret < 0)
 169                 return ret;
 170
 171         /* Delay for data output */
 172         msleep(JSA1212_ALS_DELAY_MS);
 173
 174         /* Read 12 bit data */
 175         ret = regmap_bulk_read(data->regmap, JSA1212_ALS_DT1_REG, &als_data, 2);
 176         if (ret < 0) {
 177                 dev_err(&data->client->dev, "als data read err\n");
 178                 goto als_data_read_err;
 179         }
 180
 181         *val = le16_to_cpu(als_data);
 182
 183 als_data_read_err:
 184         return jsa1212_als_enable(data, JSA1212_CONF_ALS_DISABLE);
 185 }
 186
 187 static int jsa1212_read_pxs_data(struct jsa1212_data *data,
 188                                 unsigned int *val)
 189 {
 190         int ret;
 191         unsigned int pxs_data;
 192
 193         ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
 194         if (ret < 0)
 195                 return ret;
 196
 197         /* Delay for data output */
 198         msleep(JSA1212_PXS_DELAY_MS);
 199
 200         /* Read out all data */
 201         ret = regmap_read(data->regmap, JSA1212_PXS_DATA_REG, &pxs_data);
 202         if (ret < 0) {
 203                 dev_err(&data->client->dev, "pxs data read err\n");
 204                 goto pxs_data_read_err;
 205         }
 206
 207         *val = pxs_data & JSA1212_PXS_DATA_MASK;
 208
 209 pxs_data_read_err:
 210         return jsa1212_pxs_enable(data, JSA1212_CONF_PXS_DISABLE);
 211 }
 212
 213 static int jsa1212_read_raw(struct iio_dev *indio_dev,
 214                                 struct iio_chan_spec const *chan,
 215                                 int *val, int *val2, long mask)
 216 {
 217         int ret;
 218         struct jsa1212_data *data = iio_priv(indio_dev);
 219
 220         switch (mask) {
 221         case IIO_CHAN_INFO_RAW:
 222                 mutex_lock(&data->lock);
 223                 switch (chan->type) {
 224                 case IIO_LIGHT:
 225                         ret = jsa1212_read_als_data(data, val);
 226                         break;
 227                 case IIO_PROXIMITY:
 228                         ret = jsa1212_read_pxs_data(data, val);
 229                         break;
 230                 default:
 231                         ret = -EINVAL;
 232                         break;
 233                 }
 234                 mutex_unlock(&data->lock);
 235                 return ret < 0 ? ret : IIO_VAL_INT;
 236         case IIO_CHAN_INFO_SCALE:
 237                 switch (chan->type) {
 238                 case IIO_LIGHT:
 239                         *val = jsa1212_als_range_val[data->als_rng_idx];
 240                         *val2 = BIT(12); /* Max 12 bit value */
 241                         return IIO_VAL_FRACTIONAL;
 242                 default:
 243                         break;
 244                 }
 245                 break;
 246         default:
 247                 break;
 248         }
 249
 250         return -EINVAL;
 251 }
 252
 253 static const struct iio_chan_spec jsa1212_channels[] = {
 254         {
 255                 .type = IIO_LIGHT,
 256                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 257                         BIT(IIO_CHAN_INFO_SCALE),
 258         },
 259         {
 260                 .type = IIO_PROXIMITY,
 261                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 262         }
 263 };
 264
 265 static const struct iio_info jsa1212_info = {
 266         .read_raw               = &jsa1212_read_raw,
 267 };
 268
 269 static int jsa1212_chip_init(struct jsa1212_data *data)
 270 {
 271         int ret;
 272
 273         ret = regmap_write(data->regmap, JSA1212_CONF_REG,
 274                                 (JSA1212_CONF_PXS_SLP_50MS |
 275                                 JSA1212_CONF_IRDR_200MA));
 276         if (ret < 0)
 277                 return ret;
 278
 279         ret = regmap_write(data->regmap, JSA1212_INT_REG,
 280                                 JSA1212_INT_ALS_PRST_4CONV);
 281         if (ret < 0)
 282                 return ret;
 283
 284         data->als_rng_idx = JSA1212_ALS_RNG_0_2048;
 285
 286         return 0;
 287 }
 288
 289 static bool jsa1212_is_volatile_reg(struct device *dev, unsigned int reg)
 290 {
 291         switch (reg) {
 292         case JSA1212_PXS_DATA_REG:
 293         case JSA1212_ALS_DT1_REG:
 294         case JSA1212_ALS_DT2_REG:
 295         case JSA1212_INT_REG:
 296                 return true;
 297         default:
 298                 return false;
 299         }
 300 }
 301
 302 static const struct regmap_config jsa1212_regmap_config = {
 303         .name =  JSA1212_REGMAP_NAME,
 304         .reg_bits = 8,
 305         .val_bits = 8,
 306         .max_register = JSA1212_MAX_REG,
 307         .cache_type = REGCACHE_RBTREE,
 308         .volatile_reg = jsa1212_is_volatile_reg,
 309 };
 310
 311 static int jsa1212_probe(struct i2c_client *client,
 312                          const struct i2c_device_id *id)
 313 {
 314         struct jsa1212_data *data;
 315         struct iio_dev *indio_dev;
 316         struct regmap *regmap;
 317         int ret;
 318
 319         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 320         if (!indio_dev)
 321                 return -ENOMEM;
 322
 323         regmap = devm_regmap_init_i2c(client, &jsa1212_regmap_config);
 324         if (IS_ERR(regmap)) {
 325                 dev_err(&client->dev, "Regmap initialization failed.\n");
 326                 return PTR_ERR(regmap);
 327         }
 328
 329         data = iio_priv(indio_dev);
 330
 331         i2c_set_clientdata(client, indio_dev);
 332         data->client = client;
 333         data->regmap = regmap;
 334
 335         mutex_init(&data->lock);
 336
 337         ret = jsa1212_chip_init(data);
 338         if (ret < 0)
 339                 return ret;
 340
 341         indio_dev->channels = jsa1212_channels;
 342         indio_dev->num_channels = ARRAY_SIZE(jsa1212_channels);
 343         indio_dev->name = JSA1212_DRIVER_NAME;
 344         indio_dev->modes = INDIO_DIRECT_MODE;
 345
 346         indio_dev->info = &jsa1212_info;
 347
 348         ret = iio_device_register(indio_dev);
 349         if (ret < 0)
 350                 dev_err(&client->dev, "%s: register device failed\n", __func__);
 351
 352         return ret;
 353 }
 354
 355  /* power off the device */
 356 static int jsa1212_power_off(struct jsa1212_data *data)
 357 {
 358         int ret;
 359
 360         mutex_lock(&data->lock);
 361
 362         ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
 363                                 JSA1212_CONF_ALS_MASK |
 364                                 JSA1212_CONF_PXS_MASK,
 365                                 JSA1212_CONF_ALS_DISABLE |
 366                                 JSA1212_CONF_PXS_DISABLE);
 367
 368         if (ret < 0)
 369                 dev_err(&data->client->dev, "power off cmd failed\n");
 370
 371         mutex_unlock(&data->lock);
 372
 373         return ret;
 374 }
 375
 376 static int jsa1212_remove(struct i2c_client *client)
 377 {
 378         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 379         struct jsa1212_data *data = iio_priv(indio_dev);
 380
 381         iio_device_unregister(indio_dev);
 382
 383         return jsa1212_power_off(data);
 384 }
 385
 386 #ifdef CONFIG_PM_SLEEP
 387 static int jsa1212_suspend(struct device *dev)
 388 {
 389         struct jsa1212_data *data;
 390
 391         data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 392
 393         return jsa1212_power_off(data);
 394 }
 395
 396 static int jsa1212_resume(struct device *dev)
 397 {
 398         int ret = 0;
 399         struct jsa1212_data *data;
 400
 401         data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 402
 403         mutex_lock(&data->lock);
 404
 405         if (data->als_en) {
 406                 ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
 407                 if (ret < 0) {
 408                         dev_err(dev, "als resume failed\n");
 409                         goto unlock_and_ret;
 410                 }
 411         }
 412
 413         if (data->pxs_en) {
 414                 ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
 415                 if (ret < 0)
 416                         dev_err(dev, "pxs resume failed\n");
 417         }
 418
 419 unlock_and_ret:
 420         mutex_unlock(&data->lock);
 421         return ret;
 422 }
 423
 424 static SIMPLE_DEV_PM_OPS(jsa1212_pm_ops, jsa1212_suspend, jsa1212_resume);
 425
 426 #define JSA1212_PM_OPS (&jsa1212_pm_ops)
 427 #else
 428 #define JSA1212_PM_OPS NULL
 429 #endif
 430
 431 static const struct acpi_device_id jsa1212_acpi_match[] = {
 432         {"JSA1212", 0},
 433         { },
 434 };
 435 MODULE_DEVICE_TABLE(acpi, jsa1212_acpi_match);
 436
 437 static const struct i2c_device_id jsa1212_id[] = {
 438         { JSA1212_DRIVER_NAME, 0 },
 439         { }
 440 };
 441 MODULE_DEVICE_TABLE(i2c, jsa1212_id);
 442
 443 static struct i2c_driver jsa1212_driver = {
 444         .driver = {
 445                 .name   = JSA1212_DRIVER_NAME,
 446                 .pm     = JSA1212_PM_OPS,
 447                 .acpi_match_table = ACPI_PTR(jsa1212_acpi_match),
 448         },
 449         .probe          = jsa1212_probe,
 450         .remove         = jsa1212_remove,
 451         .id_table       = jsa1212_id,
 452 };
 453 module_i2c_driver(jsa1212_driver);
 454
 455 MODULE_AUTHOR("Sathya Kuppuswamy <sathyanarayanan.kuppuswamy@linux.intel.com>");
 456 MODULE_DESCRIPTION("JSA1212 proximity/ambient light sensor driver");
 457 MODULE_LICENSE("GPL v2");