drivers/iio/light/si1145.c

   1 /*
   2  * si1145.c - Support for Silabs SI1132 and SI1141/2/3/5/6/7 combined ambient
   3  * light, UV index and proximity sensors
   4  *
   5  * Copyright 2014-16 Peter Meerwald-Stadler <pmeerw@pmeerw.net>
   6  * Copyright 2016 Crestez Dan Leonard <leonard.crestez@intel.com>
   7  *
   8  * This file is subject to the terms and conditions of version 2 of
   9  * the GNU General Public License.  See the file COPYING in the main
  10  * directory of this archive for more details.
  11  *
  12  * SI1132 (7-bit I2C slave address 0x60)
  13  * SI1141/2/3 (7-bit I2C slave address 0x5a)
  14  * SI1145/6/6 (7-bit I2C slave address 0x60)
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/i2c.h>
  19 #include <linux/err.h>
  20 #include <linux/slab.h>
  21 #include <linux/delay.h>
  22 #include <linux/irq.h>
  23 #include <linux/gpio.h>
  24
  25 #include <linux/iio/iio.h>
  26 #include <linux/iio/sysfs.h>
  27 #include <linux/iio/trigger.h>
  28 #include <linux/iio/trigger_consumer.h>
  29 #include <linux/iio/triggered_buffer.h>
  30 #include <linux/iio/buffer.h>
  31 #include <linux/util_macros.h>
  32
  33 #define SI1145_REG_PART_ID              0x00
  34 #define SI1145_REG_REV_ID               0x01
  35 #define SI1145_REG_SEQ_ID               0x02
  36 #define SI1145_REG_INT_CFG              0x03
  37 #define SI1145_REG_IRQ_ENABLE           0x04
  38 #define SI1145_REG_IRQ_MODE             0x05
  39 #define SI1145_REG_HW_KEY               0x07
  40 #define SI1145_REG_MEAS_RATE            0x08
  41 #define SI1145_REG_PS_LED21             0x0f
  42 #define SI1145_REG_PS_LED3              0x10
  43 #define SI1145_REG_UCOEF1               0x13
  44 #define SI1145_REG_UCOEF2               0x14
  45 #define SI1145_REG_UCOEF3               0x15
  46 #define SI1145_REG_UCOEF4               0x16
  47 #define SI1145_REG_PARAM_WR             0x17
  48 #define SI1145_REG_COMMAND              0x18
  49 #define SI1145_REG_RESPONSE             0x20
  50 #define SI1145_REG_IRQ_STATUS           0x21
  51 #define SI1145_REG_ALSVIS_DATA          0x22
  52 #define SI1145_REG_ALSIR_DATA           0x24
  53 #define SI1145_REG_PS1_DATA             0x26
  54 #define SI1145_REG_PS2_DATA             0x28
  55 #define SI1145_REG_PS3_DATA             0x2a
  56 #define SI1145_REG_AUX_DATA             0x2c
  57 #define SI1145_REG_PARAM_RD             0x2e
  58 #define SI1145_REG_CHIP_STAT            0x30
  59
  60 #define SI1145_UCOEF1_DEFAULT           0x7b
  61 #define SI1145_UCOEF2_DEFAULT           0x6b
  62 #define SI1145_UCOEF3_DEFAULT           0x01
  63 #define SI1145_UCOEF4_DEFAULT           0x00
  64
  65 /* Helper to figure out PS_LED register / shift per channel */
  66 #define SI1145_PS_LED_REG(ch) \
  67         (((ch) == 2) ? SI1145_REG_PS_LED3 : SI1145_REG_PS_LED21)
  68 #define SI1145_PS_LED_SHIFT(ch) \
  69         (((ch) == 1) ? 4 : 0)
  70
  71 /* Parameter offsets */
  72 #define SI1145_PARAM_CHLIST             0x01
  73 #define SI1145_PARAM_PSLED12_SELECT     0x02
  74 #define SI1145_PARAM_PSLED3_SELECT      0x03
  75 #define SI1145_PARAM_PS_ENCODING        0x05
  76 #define SI1145_PARAM_ALS_ENCODING       0x06
  77 #define SI1145_PARAM_PS1_ADC_MUX        0x07
  78 #define SI1145_PARAM_PS2_ADC_MUX        0x08
  79 #define SI1145_PARAM_PS3_ADC_MUX        0x09
  80 #define SI1145_PARAM_PS_ADC_COUNTER     0x0a
  81 #define SI1145_PARAM_PS_ADC_GAIN        0x0b
  82 #define SI1145_PARAM_PS_ADC_MISC        0x0c
  83 #define SI1145_PARAM_ALS_ADC_MUX        0x0d
  84 #define SI1145_PARAM_ALSIR_ADC_MUX      0x0e
  85 #define SI1145_PARAM_AUX_ADC_MUX        0x0f
  86 #define SI1145_PARAM_ALSVIS_ADC_COUNTER 0x10
  87 #define SI1145_PARAM_ALSVIS_ADC_GAIN    0x11
  88 #define SI1145_PARAM_ALSVIS_ADC_MISC    0x12
  89 #define SI1145_PARAM_LED_RECOVERY       0x1c
  90 #define SI1145_PARAM_ALSIR_ADC_COUNTER  0x1d
  91 #define SI1145_PARAM_ALSIR_ADC_GAIN     0x1e
  92 #define SI1145_PARAM_ALSIR_ADC_MISC     0x1f
  93 #define SI1145_PARAM_ADC_OFFSET         0x1a
  94
  95 /* Channel enable masks for CHLIST parameter */
  96 #define SI1145_CHLIST_EN_PS1            BIT(0)
  97 #define SI1145_CHLIST_EN_PS2            BIT(1)
  98 #define SI1145_CHLIST_EN_PS3            BIT(2)
  99 #define SI1145_CHLIST_EN_ALSVIS         BIT(4)
 100 #define SI1145_CHLIST_EN_ALSIR          BIT(5)
 101 #define SI1145_CHLIST_EN_AUX            BIT(6)
 102 #define SI1145_CHLIST_EN_UV             BIT(7)
 103
 104 /* Proximity measurement mode for ADC_MISC parameter */
 105 #define SI1145_PS_ADC_MODE_NORMAL       BIT(2)
 106 /* Signal range mask for ADC_MISC parameter */
 107 #define SI1145_ADC_MISC_RANGE           BIT(5)
 108
 109 /* Commands for REG_COMMAND */
 110 #define SI1145_CMD_NOP                  0x00
 111 #define SI1145_CMD_RESET                0x01
 112 #define SI1145_CMD_PS_FORCE             0x05
 113 #define SI1145_CMD_ALS_FORCE            0x06
 114 #define SI1145_CMD_PSALS_FORCE          0x07
 115 #define SI1145_CMD_PS_PAUSE             0x09
 116 #define SI1145_CMD_ALS_PAUSE            0x0a
 117 #define SI1145_CMD_PSALS_PAUSE          0x0b
 118 #define SI1145_CMD_PS_AUTO              0x0d
 119 #define SI1145_CMD_ALS_AUTO             0x0e
 120 #define SI1145_CMD_PSALS_AUTO           0x0f
 121 #define SI1145_CMD_PARAM_QUERY          0x80
 122 #define SI1145_CMD_PARAM_SET            0xa0
 123
 124 #define SI1145_RSP_INVALID_SETTING      0x80
 125 #define SI1145_RSP_COUNTER_MASK         0x0F
 126
 127 /* Minimum sleep after each command to ensure it's received */
 128 #define SI1145_COMMAND_MINSLEEP_MS      5
 129 /* Return -ETIMEDOUT after this long */
 130 #define SI1145_COMMAND_TIMEOUT_MS       25
 131
 132 /* Interrupt configuration masks for INT_CFG register */
 133 #define SI1145_INT_CFG_OE               BIT(0) /* enable interrupt */
 134 #define SI1145_INT_CFG_MODE             BIT(1) /* auto reset interrupt pin */
 135
 136 /* Interrupt enable masks for IRQ_ENABLE register */
 137 #define SI1145_MASK_ALL_IE              (BIT(4) | BIT(3) | BIT(2) | BIT(0))
 138
 139 #define SI1145_MUX_TEMP                 0x65
 140 #define SI1145_MUX_VDD                  0x75
 141
 142 /* Proximity LED current; see Table 2 in datasheet */
 143 #define SI1145_LED_CURRENT_45mA         0x04
 144
 145 enum {
 146         SI1132,
 147         SI1141,
 148         SI1142,
 149         SI1143,
 150         SI1145,
 151         SI1146,
 152         SI1147,
 153 };
 154
 155 struct si1145_part_info {
 156         u8 part;
 157         const struct iio_info *iio_info;
 158         const struct iio_chan_spec *channels;
 159         unsigned int num_channels;
 160         unsigned int num_leds;
 161         bool uncompressed_meas_rate;
 162 };
 163
 164 /**
 165  * struct si1145_data - si1145 chip state data
 166  * @client:     I2C client
 167  * @lock:       mutex to protect shared state.
 168  * @cmdlock:    Low-level mutex to protect command execution only
 169  * @rsp_seq:    Next expected response number or -1 if counter reset required
 170  * @scan_mask:  Saved scan mask to avoid duplicate set_chlist
 171  * @autonomous: If automatic measurements are active (for buffer support)
 172  * @part_info:  Part information
 173  * @trig:       Pointer to iio trigger
 174  * @meas_rate:  Value of MEAS_RATE register. Only set in HW in auto mode
 175  * @buffer:     Used to pack data read from sensor.
 176  */
 177 struct si1145_data {
 178         struct i2c_client *client;
 179         struct mutex lock;
 180         struct mutex cmdlock;
 181         int rsp_seq;
 182         const struct si1145_part_info *part_info;
 183         unsigned long scan_mask;
 184         bool autonomous;
 185         struct iio_trigger *trig;
 186         int meas_rate;
 187         /*
 188          * Ensure timestamp will be naturally aligned if present.
 189          * Maximum buffer size (may be only partly used if not all
 190          * channels are enabled):
 191          *   6*2 bytes channels data + 4 bytes alignment +
 192          *   8 bytes timestamp
 193          */
 194         u8 buffer[24] __aligned(8);
 195 };
 196
 197 /**
 198  * __si1145_command_reset() - Send CMD_NOP and wait for response 0
 199  *
 200  * Does not modify data->rsp_seq
 201  *
 202  * Return: 0 on success and -errno on error.
 203  */
 204 static int __si1145_command_reset(struct si1145_data *data)
 205 {
 206         struct device *dev = &data->client->dev;
 207         unsigned long stop_jiffies;
 208         int ret;
 209
 210         ret = i2c_smbus_write_byte_data(data->client, SI1145_REG_COMMAND,
 211                                                       SI1145_CMD_NOP);
 212         if (ret < 0)
 213                 return ret;
 214         msleep(SI1145_COMMAND_MINSLEEP_MS);
 215
 216         stop_jiffies = jiffies + SI1145_COMMAND_TIMEOUT_MS * HZ / 1000;
 217         while (true) {
 218                 ret = i2c_smbus_read_byte_data(data->client,
 219                                                SI1145_REG_RESPONSE);
 220                 if (ret <= 0)
 221                         return ret;
 222                 if (time_after(jiffies, stop_jiffies)) {
 223                         dev_warn(dev, "timeout on reset\n");
 224                         return -ETIMEDOUT;
 225                 }
 226                 msleep(SI1145_COMMAND_MINSLEEP_MS);
 227                 continue;
 228         }
 229 }
 230
 231 /**
 232  * si1145_command() - Execute a command and poll the response register
 233  *
 234  * All conversion overflows are reported as -EOVERFLOW
 235  * INVALID_SETTING is reported as -EINVAL
 236  * Timeouts are reported as -ETIMEDOUT
 237  *
 238  * Return: 0 on success or -errno on failure
 239  */
 240 static int si1145_command(struct si1145_data *data, u8 cmd)
 241 {
 242         struct device *dev = &data->client->dev;
 243         unsigned long stop_jiffies;
 244         int ret;
 245
 246         mutex_lock(&data->cmdlock);
 247
 248         if (data->rsp_seq < 0) {
 249                 ret = __si1145_command_reset(data);
 250                 if (ret < 0) {
 251                         dev_err(dev, "failed to reset command counter, ret=%d\n",
 252                                 ret);
 253                         goto out;
 254                 }
 255                 data->rsp_seq = 0;
 256         }
 257
 258         ret = i2c_smbus_write_byte_data(data->client, SI1145_REG_COMMAND, cmd);
 259         if (ret) {
 260                 dev_warn(dev, "failed to write command, ret=%d\n", ret);
 261                 goto out;
 262         }
 263         /* Sleep a little to ensure the command is received */
 264         msleep(SI1145_COMMAND_MINSLEEP_MS);
 265
 266         stop_jiffies = jiffies + SI1145_COMMAND_TIMEOUT_MS * HZ / 1000;
 267         while (true) {
 268                 ret = i2c_smbus_read_byte_data(data->client,
 269                                                SI1145_REG_RESPONSE);
 270                 if (ret < 0) {
 271                         dev_warn(dev, "failed to read response, ret=%d\n", ret);
 272                         break;
 273                 }
 274
 275                 if ((ret & ~SI1145_RSP_COUNTER_MASK) == 0) {
 276                         if (ret == data->rsp_seq) {
 277                                 if (time_after(jiffies, stop_jiffies)) {
 278                                         dev_warn(dev, "timeout on command %#02hhx\n",
 279                                                  cmd);
 280                                         ret = -ETIMEDOUT;
 281                                         break;
 282                                 }
 283                                 msleep(SI1145_COMMAND_MINSLEEP_MS);
 284                                 continue;
 285                         }
 286                         if (ret == ((data->rsp_seq + 1) &
 287                                 SI1145_RSP_COUNTER_MASK)) {
 288                                 data->rsp_seq = ret;
 289                                 ret = 0;
 290                                 break;
 291                         }
 292                         dev_warn(dev, "unexpected response counter %d instead of %d\n",
 293                                  ret, (data->rsp_seq + 1) &
 294                                         SI1145_RSP_COUNTER_MASK);
 295                         ret = -EIO;
 296                 } else {
 297                         if (ret == SI1145_RSP_INVALID_SETTING) {
 298                                 dev_warn(dev, "INVALID_SETTING error on command %#02hhx\n",
 299                                          cmd);
 300                                 ret = -EINVAL;
 301                         } else {
 302                                 /* All overflows are treated identically */
 303                                 dev_dbg(dev, "overflow, ret=%d, cmd=%#02hhx\n",
 304                                         ret, cmd);
 305                                 ret = -EOVERFLOW;
 306                         }
 307                 }
 308
 309                 /* Force a counter reset next time */
 310                 data->rsp_seq = -1;
 311                 break;
 312         }
 313
 314 out:
 315         mutex_unlock(&data->cmdlock);
 316
 317         return ret;
 318 }
 319
 320 static int si1145_param_update(struct si1145_data *data, u8 op, u8 param,
 321                                u8 value)
 322 {
 323         int ret;
 324
 325         ret = i2c_smbus_write_byte_data(data->client,
 326                 SI1145_REG_PARAM_WR, value);
 327         if (ret < 0)
 328                 return ret;
 329
 330         return si1145_command(data, op | (param & 0x1F));
 331 }
 332
 333 static int si1145_param_set(struct si1145_data *data, u8 param, u8 value)
 334 {
 335         return si1145_param_update(data, SI1145_CMD_PARAM_SET, param, value);
 336 }
 337
 338 /* Set param. Returns negative errno or current value */
 339 static int si1145_param_query(struct si1145_data *data, u8 param)
 340 {
 341         int ret;
 342
 343         ret = si1145_command(data, SI1145_CMD_PARAM_QUERY | (param & 0x1F));
 344         if (ret < 0)
 345                 return ret;
 346
 347         return i2c_smbus_read_byte_data(data->client, SI1145_REG_PARAM_RD);
 348 }
 349
 350 /* Expand 8 bit compressed value to 16 bit, see Silabs AN498 */
 351 static u16 si1145_uncompress(u8 x)
 352 {
 353         u16 result = 0;
 354         u8 exponent = 0;
 355
 356         if (x < 8)
 357                 return 0;
 358
 359         exponent = (x & 0xf0) >> 4;
 360         result = 0x10 | (x & 0x0f);
 361
 362         if (exponent >= 4)
 363                 return result << (exponent - 4);
 364         return result >> (4 - exponent);
 365 }
 366
 367 /* Compress 16 bit value to 8 bit, see Silabs AN498 */
 368 static u8 si1145_compress(u16 x)
 369 {
 370         u32 exponent = 0;
 371         u32 significand = 0;
 372         u32 tmp = x;
 373
 374         if (x == 0x0000)
 375                 return 0x00;
 376         if (x == 0x0001)
 377                 return 0x08;
 378
 379         while (1) {
 380                 tmp >>= 1;
 381                 exponent += 1;
 382                 if (tmp == 1)
 383                         break;
 384         }
 385
 386         if (exponent < 5) {
 387                 significand = x << (4 - exponent);
 388                 return (exponent << 4) | (significand & 0xF);
 389         }
 390
 391         significand = x >> (exponent - 5);
 392         if (significand & 1) {
 393                 significand += 2;
 394                 if (significand & 0x0040) {
 395                         exponent += 1;
 396                         significand >>= 1;
 397                 }
 398         }
 399
 400         return (exponent << 4) | ((significand >> 1) & 0xF);
 401 }
 402
 403 /* Write meas_rate in hardware */
 404 static int si1145_set_meas_rate(struct si1145_data *data, int interval)
 405 {
 406         if (data->part_info->uncompressed_meas_rate)
 407                 return i2c_smbus_write_word_data(data->client,
 408                         SI1145_REG_MEAS_RATE, interval);
 409         else
 410                 return i2c_smbus_write_byte_data(data->client,
 411                         SI1145_REG_MEAS_RATE, interval);
 412 }
 413
 414 static int si1145_read_samp_freq(struct si1145_data *data, int *val, int *val2)
 415 {
 416         *val = 32000;
 417         if (data->part_info->uncompressed_meas_rate)
 418                 *val2 = data->meas_rate;
 419         else
 420                 *val2 = si1145_uncompress(data->meas_rate);
 421         return IIO_VAL_FRACTIONAL;
 422 }
 423
 424 /* Set the samp freq in driver private data */
 425 static int si1145_store_samp_freq(struct si1145_data *data, int val)
 426 {
 427         int ret = 0;
 428         int meas_rate;
 429
 430         if (val <= 0 || val > 32000)
 431                 return -ERANGE;
 432         meas_rate = 32000 / val;
 433
 434         mutex_lock(&data->lock);
 435         if (data->autonomous) {
 436                 ret = si1145_set_meas_rate(data, meas_rate);
 437                 if (ret)
 438                         goto out;
 439         }
 440         if (data->part_info->uncompressed_meas_rate)
 441                 data->meas_rate = meas_rate;
 442         else
 443                 data->meas_rate = si1145_compress(meas_rate);
 444
 445 out:
 446         mutex_unlock(&data->lock);
 447
 448         return ret;
 449 }
 450
 451 static irqreturn_t si1145_trigger_handler(int irq, void *private)
 452 {
 453         struct iio_poll_func *pf = private;
 454         struct iio_dev *indio_dev = pf->indio_dev;
 455         struct si1145_data *data = iio_priv(indio_dev);
 456         int i, j = 0;
 457         int ret;
 458         u8 irq_status = 0;
 459
 460         if (!data->autonomous) {
 461                 ret = si1145_command(data, SI1145_CMD_PSALS_FORCE);
 462                 if (ret < 0 && ret != -EOVERFLOW)
 463                         goto done;
 464         } else {
 465                 irq_status = ret = i2c_smbus_read_byte_data(data->client,
 466                                 SI1145_REG_IRQ_STATUS);
 467                 if (ret < 0)
 468                         goto done;
 469                 if (!(irq_status & SI1145_MASK_ALL_IE))
 470                         goto done;
 471         }
 472
 473         for_each_set_bit(i, indio_dev->active_scan_mask,
 474                 indio_dev->masklength) {
 475                 int run = 1;
 476
 477                 while (i + run < indio_dev->masklength) {
 478                         if (!test_bit(i + run, indio_dev->active_scan_mask))
 479                                 break;
 480                         if (indio_dev->channels[i + run].address !=
 481                                 indio_dev->channels[i].address + 2 * run)
 482                                 break;
 483                         run++;
 484                 }
 485
 486                 ret = i2c_smbus_read_i2c_block_data_or_emulated(
 487                                 data->client, indio_dev->channels[i].address,
 488                                 sizeof(u16) * run, &data->buffer[j]);
 489                 if (ret < 0)
 490                         goto done;
 491                 j += run * sizeof(u16);
 492                 i += run - 1;
 493         }
 494
 495         if (data->autonomous) {
 496                 ret = i2c_smbus_write_byte_data(data->client,
 497                                 SI1145_REG_IRQ_STATUS,
 498                                 irq_status & SI1145_MASK_ALL_IE);
 499                 if (ret < 0)
 500                         goto done;
 501         }
 502
 503         iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
 504                 iio_get_time_ns(indio_dev));
 505
 506 done:
 507         iio_trigger_notify_done(indio_dev->trig);
 508         return IRQ_HANDLED;
 509 }
 510
 511 static int si1145_set_chlist(struct iio_dev *indio_dev, unsigned long scan_mask)
 512 {
 513         struct si1145_data *data = iio_priv(indio_dev);
 514         u8 reg = 0, mux;
 515         int ret;
 516         int i;
 517
 518         /* channel list already set, no need to reprogram */
 519         if (data->scan_mask == scan_mask)
 520                 return 0;
 521
 522         for_each_set_bit(i, &scan_mask, indio_dev->masklength) {
 523                 switch (indio_dev->channels[i].address) {
 524                 case SI1145_REG_ALSVIS_DATA:
 525                         reg |= SI1145_CHLIST_EN_ALSVIS;
 526                         break;
 527                 case SI1145_REG_ALSIR_DATA:
 528                         reg |= SI1145_CHLIST_EN_ALSIR;
 529                         break;
 530                 case SI1145_REG_PS1_DATA:
 531                         reg |= SI1145_CHLIST_EN_PS1;
 532                         break;
 533                 case SI1145_REG_PS2_DATA:
 534                         reg |= SI1145_CHLIST_EN_PS2;
 535                         break;
 536                 case SI1145_REG_PS3_DATA:
 537                         reg |= SI1145_CHLIST_EN_PS3;
 538                         break;
 539                 case SI1145_REG_AUX_DATA:
 540                         switch (indio_dev->channels[i].type) {
 541                         case IIO_UVINDEX:
 542                                 reg |= SI1145_CHLIST_EN_UV;
 543                                 break;
 544                         default:
 545                                 reg |= SI1145_CHLIST_EN_AUX;
 546                                 if (indio_dev->channels[i].type == IIO_TEMP)
 547                                         mux = SI1145_MUX_TEMP;
 548                                 else
 549                                         mux = SI1145_MUX_VDD;
 550                                 ret = si1145_param_set(data,
 551                                         SI1145_PARAM_AUX_ADC_MUX, mux);
 552                                 if (ret < 0)
 553                                         return ret;
 554
 555                                 break;
 556                         }
 557                 }
 558         }
 559
 560         data->scan_mask = scan_mask;
 561         ret = si1145_param_set(data, SI1145_PARAM_CHLIST, reg);
 562
 563         return ret < 0 ? ret : 0;
 564 }
 565
 566 static int si1145_measure(struct iio_dev *indio_dev,
 567                           struct iio_chan_spec const *chan)
 568 {
 569         struct si1145_data *data = iio_priv(indio_dev);
 570         u8 cmd;
 571         int ret;
 572
 573         ret = si1145_set_chlist(indio_dev, BIT(chan->scan_index));
 574         if (ret < 0)
 575                 return ret;
 576
 577         cmd = (chan->type == IIO_PROXIMITY) ? SI1145_CMD_PS_FORCE :
 578                 SI1145_CMD_ALS_FORCE;
 579         ret = si1145_command(data, cmd);
 580         if (ret < 0 && ret != -EOVERFLOW)
 581                 return ret;
 582
 583         return i2c_smbus_read_word_data(data->client, chan->address);
 584 }
 585
 586 /*
 587  * Conversion between iio scale and ADC_GAIN values
 588  * These could be further adjusted but proximity/intensity are dimensionless
 589  */
 590 static const int si1145_proximity_scale_available[] = {
 591         128, 64, 32, 16, 8, 4};
 592 static const int si1145_intensity_scale_available[] = {
 593         128, 64, 32, 16, 8, 4, 2, 1};
 594 static IIO_CONST_ATTR(in_proximity_scale_available,
 595         "128 64 32 16 8 4");
 596 static IIO_CONST_ATTR(in_intensity_scale_available,
 597         "128 64 32 16 8 4 2 1");
 598 static IIO_CONST_ATTR(in_intensity_ir_scale_available,
 599         "128 64 32 16 8 4 2 1");
 600
 601 static int si1145_scale_from_adcgain(int regval)
 602 {
 603         return 128 >> regval;
 604 }
 605
 606 static int si1145_proximity_adcgain_from_scale(int val, int val2)
 607 {
 608         val = find_closest_descending(val, si1145_proximity_scale_available,
 609                                 ARRAY_SIZE(si1145_proximity_scale_available));
 610         if (val < 0 || val > 5 || val2 != 0)
 611                 return -EINVAL;
 612
 613         return val;
 614 }
 615
 616 static int si1145_intensity_adcgain_from_scale(int val, int val2)
 617 {
 618         val = find_closest_descending(val, si1145_intensity_scale_available,
 619                                 ARRAY_SIZE(si1145_intensity_scale_available));
 620         if (val < 0 || val > 7 || val2 != 0)
 621                 return -EINVAL;
 622
 623         return val;
 624 }
 625
 626 static int si1145_read_raw(struct iio_dev *indio_dev,
 627                                 struct iio_chan_spec const *chan,
 628                                 int *val, int *val2, long mask)
 629 {
 630         struct si1145_data *data = iio_priv(indio_dev);
 631         int ret;
 632         u8 reg;
 633
 634         switch (mask) {
 635         case IIO_CHAN_INFO_RAW:
 636                 switch (chan->type) {
 637                 case IIO_INTENSITY:
 638                 case IIO_PROXIMITY:
 639                 case IIO_VOLTAGE:
 640                 case IIO_TEMP:
 641                 case IIO_UVINDEX:
 642                         ret = iio_device_claim_direct_mode(indio_dev);
 643                         if (ret)
 644                                 return ret;
 645                         ret = si1145_measure(indio_dev, chan);
 646                         iio_device_release_direct_mode(indio_dev);
 647
 648                         if (ret < 0)
 649                                 return ret;
 650
 651                         *val = ret;
 652
 653                         return IIO_VAL_INT;
 654                 case IIO_CURRENT:
 655                         ret = i2c_smbus_read_byte_data(data->client,
 656                                 SI1145_PS_LED_REG(chan->channel));
 657                         if (ret < 0)
 658                                 return ret;
 659
 660                         *val = (ret >> SI1145_PS_LED_SHIFT(chan->channel))
 661                                 & 0x0f;
 662
 663                         return IIO_VAL_INT;
 664                 default:
 665                         return -EINVAL;
 666                 }
 667         case IIO_CHAN_INFO_SCALE:
 668                 switch (chan->type) {
 669                 case IIO_PROXIMITY:
 670                         reg = SI1145_PARAM_PS_ADC_GAIN;
 671                         break;
 672                 case IIO_INTENSITY:
 673                         if (chan->channel2 == IIO_MOD_LIGHT_IR)
 674                                 reg = SI1145_PARAM_ALSIR_ADC_GAIN;
 675                         else
 676                                 reg = SI1145_PARAM_ALSVIS_ADC_GAIN;
 677                         break;
 678                 case IIO_TEMP:
 679                         *val = 28;
 680                         *val2 = 571429;
 681                         return IIO_VAL_INT_PLUS_MICRO;
 682                 case IIO_UVINDEX:
 683                         *val = 0;
 684                         *val2 = 10000;
 685                         return IIO_VAL_INT_PLUS_MICRO;
 686                 default:
 687                         return -EINVAL;
 688                 }
 689
 690                 ret = si1145_param_query(data, reg);
 691                 if (ret < 0)
 692                         return ret;
 693
 694                 *val = si1145_scale_from_adcgain(ret & 0x07);
 695
 696                 return IIO_VAL_INT;
 697         case IIO_CHAN_INFO_OFFSET:
 698                 switch (chan->type) {
 699                 case IIO_TEMP:
 700                         /*
 701                          * -ADC offset - ADC counts @ 25°C -
 702                          *   35 * ADC counts / °C
 703                          */
 704                         *val = -256 - 11136 + 25 * 35;
 705                         return IIO_VAL_INT;
 706                 default:
 707                         /*
 708                          * All ADC measurements have are by default offset
 709                          * by -256
 710                          * See AN498 5.6.3
 711                          */
 712                         ret = si1145_param_query(data, SI1145_PARAM_ADC_OFFSET);
 713                         if (ret < 0)
 714                                 return ret;
 715                         *val = -si1145_uncompress(ret);
 716                         return IIO_VAL_INT;
 717                 }
 718         case IIO_CHAN_INFO_SAMP_FREQ:
 719                 return si1145_read_samp_freq(data, val, val2);
 720         default:
 721                 return -EINVAL;
 722         }
 723 }
 724
 725 static int si1145_write_raw(struct iio_dev *indio_dev,
 726                                struct iio_chan_spec const *chan,
 727                                int val, int val2, long mask)
 728 {
 729         struct si1145_data *data = iio_priv(indio_dev);
 730         u8 reg1, reg2, shift;
 731         int ret;
 732
 733         switch (mask) {
 734         case IIO_CHAN_INFO_SCALE:
 735                 switch (chan->type) {
 736                 case IIO_PROXIMITY:
 737                         val = si1145_proximity_adcgain_from_scale(val, val2);
 738                         if (val < 0)
 739                                 return val;
 740                         reg1 = SI1145_PARAM_PS_ADC_GAIN;
 741                         reg2 = SI1145_PARAM_PS_ADC_COUNTER;
 742                         break;
 743                 case IIO_INTENSITY:
 744                         val = si1145_intensity_adcgain_from_scale(val, val2);
 745                         if (val < 0)
 746                                 return val;
 747                         if (chan->channel2 == IIO_MOD_LIGHT_IR) {
 748                                 reg1 = SI1145_PARAM_ALSIR_ADC_GAIN;
 749                                 reg2 = SI1145_PARAM_ALSIR_ADC_COUNTER;
 750                         } else {
 751                                 reg1 = SI1145_PARAM_ALSVIS_ADC_GAIN;
 752                                 reg2 = SI1145_PARAM_ALSVIS_ADC_COUNTER;
 753                         }
 754                         break;
 755                 default:
 756                         return -EINVAL;
 757                 }
 758
 759                 ret = iio_device_claim_direct_mode(indio_dev);
 760                 if (ret)
 761                         return ret;
 762
 763                 ret = si1145_param_set(data, reg1, val);
 764                 if (ret < 0) {
 765                         iio_device_release_direct_mode(indio_dev);
 766                         return ret;
 767                 }
 768                 /* Set recovery period to one's complement of gain */
 769                 ret = si1145_param_set(data, reg2, (~val & 0x07) << 4);
 770                 iio_device_release_direct_mode(indio_dev);
 771                 return ret;
 772         case IIO_CHAN_INFO_RAW:
 773                 if (chan->type != IIO_CURRENT)
 774                         return -EINVAL;
 775
 776                 if (val < 0 || val > 15 || val2 != 0)
 777                         return -EINVAL;
 778
 779                 reg1 = SI1145_PS_LED_REG(chan->channel);
 780                 shift = SI1145_PS_LED_SHIFT(chan->channel);
 781
 782                 ret = iio_device_claim_direct_mode(indio_dev);
 783                 if (ret)
 784                         return ret;
 785
 786                 ret = i2c_smbus_read_byte_data(data->client, reg1);
 787                 if (ret < 0) {
 788                         iio_device_release_direct_mode(indio_dev);
 789                         return ret;
 790                 }
 791                 ret = i2c_smbus_write_byte_data(data->client, reg1,
 792                         (ret & ~(0x0f << shift)) |
 793                         ((val & 0x0f) << shift));
 794                 iio_device_release_direct_mode(indio_dev);
 795                 return ret;
 796         case IIO_CHAN_INFO_SAMP_FREQ:
 797                 return si1145_store_samp_freq(data, val);
 798         default:
 799                 return -EINVAL;
 800         }
 801 }
 802
 803 #define SI1145_ST { \
 804         .sign = 'u', \
 805         .realbits = 16, \
 806         .storagebits = 16, \
 807         .endianness = IIO_LE, \
 808 }
 809
 810 #define SI1145_INTENSITY_CHANNEL(_si) { \
 811         .type = IIO_INTENSITY, \
 812         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
 813                               BIT(IIO_CHAN_INFO_OFFSET) | \
 814                               BIT(IIO_CHAN_INFO_SCALE), \
 815         .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
 816         .scan_type = SI1145_ST, \
 817         .scan_index = _si, \
 818         .address = SI1145_REG_ALSVIS_DATA, \
 819 }
 820
 821 #define SI1145_INTENSITY_IR_CHANNEL(_si) { \
 822         .type = IIO_INTENSITY, \
 823         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
 824                               BIT(IIO_CHAN_INFO_OFFSET) | \
 825                               BIT(IIO_CHAN_INFO_SCALE), \
 826         .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
 827         .modified = 1, \
 828         .channel2 = IIO_MOD_LIGHT_IR, \
 829         .scan_type = SI1145_ST, \
 830         .scan_index = _si, \
 831         .address = SI1145_REG_ALSIR_DATA, \
 832 }
 833
 834 #define SI1145_TEMP_CHANNEL(_si) { \
 835         .type = IIO_TEMP, \
 836         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
 837                               BIT(IIO_CHAN_INFO_OFFSET) | \
 838                               BIT(IIO_CHAN_INFO_SCALE), \
 839         .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
 840         .scan_type = SI1145_ST, \
 841         .scan_index = _si, \
 842         .address = SI1145_REG_AUX_DATA, \
 843 }
 844
 845 #define SI1145_UV_CHANNEL(_si) { \
 846         .type = IIO_UVINDEX, \
 847         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
 848                               BIT(IIO_CHAN_INFO_SCALE), \
 849         .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
 850         .scan_type = SI1145_ST, \
 851         .scan_index = _si, \
 852         .address = SI1145_REG_AUX_DATA, \
 853 }
 854
 855 #define SI1145_PROXIMITY_CHANNEL(_si, _ch) { \
 856         .type = IIO_PROXIMITY, \
 857         .indexed = 1, \
 858         .channel = _ch, \
 859         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
 860         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
 861                                     BIT(IIO_CHAN_INFO_OFFSET), \
 862         .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
 863         .scan_type = SI1145_ST, \
 864         .scan_index = _si, \
 865         .address = SI1145_REG_PS1_DATA + _ch * 2, \
 866 }
 867
 868 #define SI1145_VOLTAGE_CHANNEL(_si) { \
 869         .type = IIO_VOLTAGE, \
 870         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
 871         .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
 872         .scan_type = SI1145_ST, \
 873         .scan_index = _si, \
 874         .address = SI1145_REG_AUX_DATA, \
 875 }
 876
 877 #define SI1145_CURRENT_CHANNEL(_ch) { \
 878         .type = IIO_CURRENT, \
 879         .indexed = 1, \
 880         .channel = _ch, \
 881         .output = 1, \
 882         .scan_index = -1, \
 883         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
 884 }
 885
 886 static const struct iio_chan_spec si1132_channels[] = {
 887         SI1145_INTENSITY_CHANNEL(0),
 888         SI1145_INTENSITY_IR_CHANNEL(1),
 889         SI1145_TEMP_CHANNEL(2),
 890         SI1145_VOLTAGE_CHANNEL(3),
 891         SI1145_UV_CHANNEL(4),
 892         IIO_CHAN_SOFT_TIMESTAMP(6),
 893 };
 894
 895 static const struct iio_chan_spec si1141_channels[] = {
 896         SI1145_INTENSITY_CHANNEL(0),
 897         SI1145_INTENSITY_IR_CHANNEL(1),
 898         SI1145_PROXIMITY_CHANNEL(2, 0),
 899         SI1145_TEMP_CHANNEL(3),
 900         SI1145_VOLTAGE_CHANNEL(4),
 901         IIO_CHAN_SOFT_TIMESTAMP(5),
 902         SI1145_CURRENT_CHANNEL(0),
 903 };
 904
 905 static const struct iio_chan_spec si1142_channels[] = {
 906         SI1145_INTENSITY_CHANNEL(0),
 907         SI1145_INTENSITY_IR_CHANNEL(1),
 908         SI1145_PROXIMITY_CHANNEL(2, 0),
 909         SI1145_PROXIMITY_CHANNEL(3, 1),
 910         SI1145_TEMP_CHANNEL(4),
 911         SI1145_VOLTAGE_CHANNEL(5),
 912         IIO_CHAN_SOFT_TIMESTAMP(6),
 913         SI1145_CURRENT_CHANNEL(0),
 914         SI1145_CURRENT_CHANNEL(1),
 915 };
 916
 917 static const struct iio_chan_spec si1143_channels[] = {
 918         SI1145_INTENSITY_CHANNEL(0),
 919         SI1145_INTENSITY_IR_CHANNEL(1),
 920         SI1145_PROXIMITY_CHANNEL(2, 0),
 921         SI1145_PROXIMITY_CHANNEL(3, 1),
 922         SI1145_PROXIMITY_CHANNEL(4, 2),
 923         SI1145_TEMP_CHANNEL(5),
 924         SI1145_VOLTAGE_CHANNEL(6),
 925         IIO_CHAN_SOFT_TIMESTAMP(7),
 926         SI1145_CURRENT_CHANNEL(0),
 927         SI1145_CURRENT_CHANNEL(1),
 928         SI1145_CURRENT_CHANNEL(2),
 929 };
 930
 931 static const struct iio_chan_spec si1145_channels[] = {
 932         SI1145_INTENSITY_CHANNEL(0),
 933         SI1145_INTENSITY_IR_CHANNEL(1),
 934         SI1145_PROXIMITY_CHANNEL(2, 0),
 935         SI1145_TEMP_CHANNEL(3),
 936         SI1145_VOLTAGE_CHANNEL(4),
 937         SI1145_UV_CHANNEL(5),
 938         IIO_CHAN_SOFT_TIMESTAMP(6),
 939         SI1145_CURRENT_CHANNEL(0),
 940 };
 941
 942 static const struct iio_chan_spec si1146_channels[] = {
 943         SI1145_INTENSITY_CHANNEL(0),
 944         SI1145_INTENSITY_IR_CHANNEL(1),
 945         SI1145_TEMP_CHANNEL(2),
 946         SI1145_VOLTAGE_CHANNEL(3),
 947         SI1145_UV_CHANNEL(4),
 948         SI1145_PROXIMITY_CHANNEL(5, 0),
 949         SI1145_PROXIMITY_CHANNEL(6, 1),
 950         IIO_CHAN_SOFT_TIMESTAMP(7),
 951         SI1145_CURRENT_CHANNEL(0),
 952         SI1145_CURRENT_CHANNEL(1),
 953 };
 954
 955 static const struct iio_chan_spec si1147_channels[] = {
 956         SI1145_INTENSITY_CHANNEL(0),
 957         SI1145_INTENSITY_IR_CHANNEL(1),
 958         SI1145_PROXIMITY_CHANNEL(2, 0),
 959         SI1145_PROXIMITY_CHANNEL(3, 1),
 960         SI1145_PROXIMITY_CHANNEL(4, 2),
 961         SI1145_TEMP_CHANNEL(5),
 962         SI1145_VOLTAGE_CHANNEL(6),
 963         SI1145_UV_CHANNEL(7),
 964         IIO_CHAN_SOFT_TIMESTAMP(8),
 965         SI1145_CURRENT_CHANNEL(0),
 966         SI1145_CURRENT_CHANNEL(1),
 967         SI1145_CURRENT_CHANNEL(2),
 968 };
 969
 970 static struct attribute *si1132_attributes[] = {
 971         &iio_const_attr_in_intensity_scale_available.dev_attr.attr,
 972         &iio_const_attr_in_intensity_ir_scale_available.dev_attr.attr,
 973         NULL,
 974 };
 975
 976 static struct attribute *si114x_attributes[] = {
 977         &iio_const_attr_in_intensity_scale_available.dev_attr.attr,
 978         &iio_const_attr_in_intensity_ir_scale_available.dev_attr.attr,
 979         &iio_const_attr_in_proximity_scale_available.dev_attr.attr,
 980         NULL,
 981 };
 982
 983 static const struct attribute_group si1132_attribute_group = {
 984         .attrs = si1132_attributes,
 985 };
 986
 987 static const struct attribute_group si114x_attribute_group = {
 988         .attrs = si114x_attributes,
 989 };
 990
 991
 992 static const struct iio_info si1132_info = {
 993         .read_raw = si1145_read_raw,
 994         .write_raw = si1145_write_raw,
 995         .attrs = &si1132_attribute_group,
 996 };
 997
 998 static const struct iio_info si114x_info = {
 999         .read_raw = si1145_read_raw,
1000         .write_raw = si1145_write_raw,
1001         .attrs = &si114x_attribute_group,
1002 };
1003
1004 #define SI1145_PART(id, iio_info, chans, leds, uncompressed_meas_rate) \
1005         {id, iio_info, chans, ARRAY_SIZE(chans), leds, uncompressed_meas_rate}
1006
1007 static const struct si1145_part_info si1145_part_info[] = {
1008         [SI1132] = SI1145_PART(0x32, &si1132_info, si1132_channels, 0, true),
1009         [SI1141] = SI1145_PART(0x41, &si114x_info, si1141_channels, 1, false),
1010         [SI1142] = SI1145_PART(0x42, &si114x_info, si1142_channels, 2, false),
1011         [SI1143] = SI1145_PART(0x43, &si114x_info, si1143_channels, 3, false),
1012         [SI1145] = SI1145_PART(0x45, &si114x_info, si1145_channels, 1, true),
1013         [SI1146] = SI1145_PART(0x46, &si114x_info, si1146_channels, 2, true),
1014         [SI1147] = SI1145_PART(0x47, &si114x_info, si1147_channels, 3, true),
1015 };
1016
1017 static int si1145_initialize(struct si1145_data *data)
1018 {
1019         struct i2c_client *client = data->client;
1020         int ret;
1021
1022         ret = i2c_smbus_write_byte_data(client, SI1145_REG_COMMAND,
1023                                         SI1145_CMD_RESET);
1024         if (ret < 0)
1025                 return ret;
1026         msleep(SI1145_COMMAND_TIMEOUT_MS);
1027
1028         /* Hardware key, magic value */
1029         ret = i2c_smbus_write_byte_data(client, SI1145_REG_HW_KEY, 0x17);
1030         if (ret < 0)
1031                 return ret;
1032         msleep(SI1145_COMMAND_TIMEOUT_MS);
1033
1034         /* Turn off autonomous mode */
1035         ret = si1145_set_meas_rate(data, 0);
1036         if (ret < 0)
1037                 return ret;
1038
1039         /* Initialize sampling freq to 10 Hz */
1040         ret = si1145_store_samp_freq(data, 10);
1041         if (ret < 0)
1042                 return ret;
1043
1044         /* Set LED currents to 45 mA; have 4 bits, see Table 2 in datasheet */
1045         switch (data->part_info->num_leds) {
1046         case 3:
1047                 ret = i2c_smbus_write_byte_data(client,
1048                                                 SI1145_REG_PS_LED3,
1049                                                 SI1145_LED_CURRENT_45mA);
1050                 if (ret < 0)
1051                         return ret;
1052                 /* fallthrough */
1053         case 2:
1054                 ret = i2c_smbus_write_byte_data(client,
1055                                                 SI1145_REG_PS_LED21,
1056                                                 (SI1145_LED_CURRENT_45mA << 4) |
1057                                                 SI1145_LED_CURRENT_45mA);
1058                 break;
1059         case 1:
1060                 ret = i2c_smbus_write_byte_data(client,
1061                                                 SI1145_REG_PS_LED21,
1062                                                 SI1145_LED_CURRENT_45mA);
1063                 break;
1064         default:
1065                 ret = 0;
1066                 break;
1067         }
1068         if (ret < 0)
1069                 return ret;
1070
1071         /* Set normal proximity measurement mode */
1072         ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_MISC,
1073                                SI1145_PS_ADC_MODE_NORMAL);
1074         if (ret < 0)
1075                 return ret;
1076
1077         ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_GAIN, 0x01);
1078         if (ret < 0)
1079                 return ret;
1080
1081         /* ADC_COUNTER should be one complement of ADC_GAIN */
1082         ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_COUNTER, 0x06 << 4);
1083         if (ret < 0)
1084                 return ret;
1085
1086         /* Set ALS visible measurement mode */
1087         ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_MISC,
1088                                SI1145_ADC_MISC_RANGE);
1089         if (ret < 0)
1090                 return ret;
1091
1092         ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_GAIN, 0x03);
1093         if (ret < 0)
1094                 return ret;
1095
1096         ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_COUNTER,
1097                                0x04 << 4);
1098         if (ret < 0)
1099                 return ret;
1100
1101         /* Set ALS IR measurement mode */
1102         ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_MISC,
1103                                SI1145_ADC_MISC_RANGE);
1104         if (ret < 0)
1105                 return ret;
1106
1107         ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_GAIN, 0x01);
1108         if (ret < 0)
1109                 return ret;
1110
1111         ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_COUNTER,
1112                                0x06 << 4);
1113         if (ret < 0)
1114                 return ret;
1115
1116         /*
1117          * Initialize UCOEF to default values in datasheet
1118          * These registers are normally zero on reset
1119          */
1120         if (data->part_info == &si1145_part_info[SI1132] ||
1121                 data->part_info == &si1145_part_info[SI1145] ||
1122                 data->part_info == &si1145_part_info[SI1146] ||
1123                 data->part_info == &si1145_part_info[SI1147]) {
1124                 ret = i2c_smbus_write_byte_data(data->client,
1125                                                 SI1145_REG_UCOEF1,
1126                                                 SI1145_UCOEF1_DEFAULT);
1127                 if (ret < 0)
1128                         return ret;
1129                 ret = i2c_smbus_write_byte_data(data->client,
1130                                 SI1145_REG_UCOEF2, SI1145_UCOEF2_DEFAULT);
1131                 if (ret < 0)
1132                         return ret;
1133                 ret = i2c_smbus_write_byte_data(data->client,
1134                                 SI1145_REG_UCOEF3, SI1145_UCOEF3_DEFAULT);
1135                 if (ret < 0)
1136                         return ret;
1137                 ret = i2c_smbus_write_byte_data(data->client,
1138                                 SI1145_REG_UCOEF4, SI1145_UCOEF4_DEFAULT);
1139                 if (ret < 0)
1140                         return ret;
1141         }
1142
1143         return 0;
1144 }
1145
1146 /*
1147  * Program the channels we want to measure with CMD_PSALS_AUTO. No need for
1148  * _postdisable as we stop with CMD_PSALS_PAUSE; single measurement (direct)
1149  * mode reprograms the channels list anyway...
1150  */
1151 static int si1145_buffer_preenable(struct iio_dev *indio_dev)
1152 {
1153         struct si1145_data *data = iio_priv(indio_dev);
1154         int ret;
1155
1156         mutex_lock(&data->lock);
1157         ret = si1145_set_chlist(indio_dev, *indio_dev->active_scan_mask);
1158         mutex_unlock(&data->lock);
1159
1160         return ret;
1161 }
1162
1163 static bool si1145_validate_scan_mask(struct iio_dev *indio_dev,
1164                                const unsigned long *scan_mask)
1165 {
1166         struct si1145_data *data = iio_priv(indio_dev);
1167         unsigned int count = 0;
1168         int i;
1169
1170         /* Check that at most one AUX channel is enabled */
1171         for_each_set_bit(i, scan_mask, data->part_info->num_channels) {
1172                 if (indio_dev->channels[i].address == SI1145_REG_AUX_DATA)
1173                         count++;
1174         }
1175
1176         return count <= 1;
1177 }
1178
1179 static const struct iio_buffer_setup_ops si1145_buffer_setup_ops = {
1180         .preenable = si1145_buffer_preenable,
1181         .postenable = iio_triggered_buffer_postenable,
1182         .predisable = iio_triggered_buffer_predisable,
1183         .validate_scan_mask = si1145_validate_scan_mask,
1184 };
1185
1186 /**
1187  * si1145_trigger_set_state() - Set trigger state
1188  *
1189  * When not using triggers interrupts are disabled and measurement rate is
1190  * set to zero in order to minimize power consumption.
1191  */
1192 static int si1145_trigger_set_state(struct iio_trigger *trig, bool state)
1193 {
1194         struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
1195         struct si1145_data *data = iio_priv(indio_dev);
1196         int err = 0, ret;
1197
1198         mutex_lock(&data->lock);
1199
1200         if (state) {
1201                 data->autonomous = true;
1202                 err = i2c_smbus_write_byte_data(data->client,
1203                                 SI1145_REG_INT_CFG, SI1145_INT_CFG_OE);
1204                 if (err < 0)
1205                         goto disable;
1206                 err = i2c_smbus_write_byte_data(data->client,
1207                                 SI1145_REG_IRQ_ENABLE, SI1145_MASK_ALL_IE);
1208                 if (err < 0)
1209                         goto disable;
1210                 err = si1145_set_meas_rate(data, data->meas_rate);
1211                 if (err < 0)
1212                         goto disable;
1213                 err = si1145_command(data, SI1145_CMD_PSALS_AUTO);
1214                 if (err < 0)
1215                         goto disable;
1216         } else {
1217 disable:
1218                 /* Disable as much as possible skipping errors */
1219                 ret = si1145_command(data, SI1145_CMD_PSALS_PAUSE);
1220                 if (ret < 0 && !err)
1221                         err = ret;
1222                 ret = si1145_set_meas_rate(data, 0);
1223                 if (ret < 0 && !err)
1224                         err = ret;
1225                 ret = i2c_smbus_write_byte_data(data->client,
1226                                                 SI1145_REG_IRQ_ENABLE, 0);
1227                 if (ret < 0 && !err)
1228                         err = ret;
1229                 ret = i2c_smbus_write_byte_data(data->client,
1230                                                 SI1145_REG_INT_CFG, 0);
1231                 if (ret < 0 && !err)
1232                         err = ret;
1233                 data->autonomous = false;
1234         }
1235
1236         mutex_unlock(&data->lock);
1237         return err;
1238 }
1239
1240 static const struct iio_trigger_ops si1145_trigger_ops = {
1241         .set_trigger_state = si1145_trigger_set_state,
1242 };
1243
1244 static int si1145_probe_trigger(struct iio_dev *indio_dev)
1245 {
1246         struct si1145_data *data = iio_priv(indio_dev);
1247         struct i2c_client *client = data->client;
1248         struct iio_trigger *trig;
1249         int ret;
1250
1251         trig = devm_iio_trigger_alloc(&client->dev,
1252                         "%s-dev%d", indio_dev->name, indio_dev->id);
1253         if (!trig)
1254                 return -ENOMEM;
1255
1256         trig->dev.parent = &client->dev;
1257         trig->ops = &si1145_trigger_ops;
1258         iio_trigger_set_drvdata(trig, indio_dev);
1259
1260         ret = devm_request_irq(&client->dev, client->irq,
1261                           iio_trigger_generic_data_rdy_poll,
1262                           IRQF_TRIGGER_FALLING,
1263                           "si1145_irq",
1264                           trig);
1265         if (ret < 0) {
1266                 dev_err(&client->dev, "irq request failed\n");
1267                 return ret;
1268         }
1269
1270         ret = iio_trigger_register(trig);
1271         if (ret)
1272                 return ret;
1273
1274         data->trig = trig;
1275         indio_dev->trig = iio_trigger_get(data->trig);
1276
1277         return 0;
1278 }
1279
1280 static void si1145_remove_trigger(struct iio_dev *indio_dev)
1281 {
1282         struct si1145_data *data = iio_priv(indio_dev);
1283
1284         if (data->trig) {
1285                 iio_trigger_unregister(data->trig);
1286                 data->trig = NULL;
1287         }
1288 }
1289
1290 static int si1145_probe(struct i2c_client *client,
1291                         const struct i2c_device_id *id)
1292 {
1293         struct si1145_data *data;
1294         struct iio_dev *indio_dev;
1295         u8 part_id, rev_id, seq_id;
1296         int ret;
1297
1298         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
1299         if (!indio_dev)
1300                 return -ENOMEM;
1301
1302         data = iio_priv(indio_dev);
1303         i2c_set_clientdata(client, indio_dev);
1304         data->client = client;
1305         data->part_info = &si1145_part_info[id->driver_data];
1306
1307         part_id = ret = i2c_smbus_read_byte_data(data->client,
1308                                                  SI1145_REG_PART_ID);
1309         if (ret < 0)
1310                 return ret;
1311         rev_id = ret = i2c_smbus_read_byte_data(data->client,
1312                                                 SI1145_REG_REV_ID);
1313         if (ret < 0)
1314                 return ret;
1315         seq_id = ret = i2c_smbus_read_byte_data(data->client,
1316                                                 SI1145_REG_SEQ_ID);
1317         if (ret < 0)
1318                 return ret;
1319         dev_info(&client->dev, "device ID part %#02hhx rev %#02hhx seq %#02hhx\n",
1320                         part_id, rev_id, seq_id);
1321         if (part_id != data->part_info->part) {
1322                 dev_err(&client->dev, "part ID mismatch got %#02hhx, expected %#02x\n",
1323                                 part_id, data->part_info->part);
1324                 return -ENODEV;
1325         }
1326
1327         indio_dev->dev.parent = &client->dev;
1328         indio_dev->name = id->name;
1329         indio_dev->channels = data->part_info->channels;
1330         indio_dev->num_channels = data->part_info->num_channels;
1331         indio_dev->info = data->part_info->iio_info;
1332         indio_dev->modes = INDIO_DIRECT_MODE;
1333
1334         mutex_init(&data->lock);
1335         mutex_init(&data->cmdlock);
1336
1337         ret = si1145_initialize(data);
1338         if (ret < 0)
1339                 return ret;
1340
1341         ret = iio_triggered_buffer_setup(indio_dev, NULL,
1342                 si1145_trigger_handler, &si1145_buffer_setup_ops);
1343         if (ret < 0)
1344                 return ret;
1345
1346         if (client->irq) {
1347                 ret = si1145_probe_trigger(indio_dev);
1348                 if (ret < 0)
1349                         goto error_free_buffer;
1350         } else {
1351                 dev_info(&client->dev, "no irq, using polling\n");
1352         }
1353
1354         ret = iio_device_register(indio_dev);
1355         if (ret < 0)
1356                 goto error_free_trigger;
1357
1358         return 0;
1359
1360 error_free_trigger:
1361         si1145_remove_trigger(indio_dev);
1362 error_free_buffer:
1363         iio_triggered_buffer_cleanup(indio_dev);
1364
1365         return ret;
1366 }
1367
1368 static const struct i2c_device_id si1145_ids[] = {
1369         { "si1132", SI1132 },
1370         { "si1141", SI1141 },
1371         { "si1142", SI1142 },
1372         { "si1143", SI1143 },
1373         { "si1145", SI1145 },
1374         { "si1146", SI1146 },
1375         { "si1147", SI1147 },
1376         { }
1377 };
1378 MODULE_DEVICE_TABLE(i2c, si1145_ids);
1379
1380 static int si1145_remove(struct i2c_client *client)
1381 {
1382         struct iio_dev *indio_dev = i2c_get_clientdata(client);
1383
1384         iio_device_unregister(indio_dev);
1385         si1145_remove_trigger(indio_dev);
1386         iio_triggered_buffer_cleanup(indio_dev);
1387
1388         return 0;
1389 }
1390
1391 static struct i2c_driver si1145_driver = {
1392         .driver = {
1393                 .name   = "si1145",
1394         },
1395         .probe  = si1145_probe,
1396         .remove = si1145_remove,
1397         .id_table = si1145_ids,
1398 };
1399
1400 module_i2c_driver(si1145_driver);
1401
1402 MODULE_AUTHOR("Peter Meerwald-Stadler <pmeerw@pmeerw.net>");
1403 MODULE_DESCRIPTION("Silabs SI1132 and SI1141/2/3/5/6/7 proximity, ambient light and UV index sensor driver");
1404 MODULE_LICENSE("GPL");