linux/drivers/iio/light/si1145.c
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   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
 145enum {
 146        SI1132,
 147        SI1141,
 148        SI1142,
 149        SI1143,
 150        SI1145,
 151        SI1146,
 152        SI1147,
 153};
 154
 155struct 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 */
 176struct si1145_data {
 177        struct i2c_client *client;
 178        struct mutex lock;
 179        struct mutex cmdlock;
 180        int rsp_seq;
 181        const struct si1145_part_info *part_info;
 182        unsigned long scan_mask;
 183        bool autonomous;
 184        struct iio_trigger *trig;
 185        int meas_rate;
 186};
 187
 188/**
 189 * __si1145_command_reset() - Send CMD_NOP and wait for response 0
 190 *
 191 * Does not modify data->rsp_seq
 192 *
 193 * Return: 0 on success and -errno on error.
 194 */
 195static int __si1145_command_reset(struct si1145_data *data)
 196{
 197        struct device *dev = &data->client->dev;
 198        unsigned long stop_jiffies;
 199        int ret;
 200
 201        ret = i2c_smbus_write_byte_data(data->client, SI1145_REG_COMMAND,
 202                                                      SI1145_CMD_NOP);
 203        if (ret < 0)
 204                return ret;
 205        msleep(SI1145_COMMAND_MINSLEEP_MS);
 206
 207        stop_jiffies = jiffies + SI1145_COMMAND_TIMEOUT_MS * HZ / 1000;
 208        while (true) {
 209                ret = i2c_smbus_read_byte_data(data->client,
 210                                               SI1145_REG_RESPONSE);
 211                if (ret <= 0)
 212                        return ret;
 213                if (time_after(jiffies, stop_jiffies)) {
 214                        dev_warn(dev, "timeout on reset\n");
 215                        return -ETIMEDOUT;
 216                }
 217                msleep(SI1145_COMMAND_MINSLEEP_MS);
 218                continue;
 219        }
 220}
 221
 222/**
 223 * si1145_command() - Execute a command and poll the response register
 224 *
 225 * All conversion overflows are reported as -EOVERFLOW
 226 * INVALID_SETTING is reported as -EINVAL
 227 * Timeouts are reported as -ETIMEDOUT
 228 *
 229 * Return: 0 on success or -errno on failure
 230 */
 231static int si1145_command(struct si1145_data *data, u8 cmd)
 232{
 233        struct device *dev = &data->client->dev;
 234        unsigned long stop_jiffies;
 235        int ret;
 236
 237        mutex_lock(&data->cmdlock);
 238
 239        if (data->rsp_seq < 0) {
 240                ret = __si1145_command_reset(data);
 241                if (ret < 0) {
 242                        dev_err(dev, "failed to reset command counter, ret=%d\n",
 243                                ret);
 244                        goto out;
 245                }
 246                data->rsp_seq = 0;
 247        }
 248
 249        ret = i2c_smbus_write_byte_data(data->client, SI1145_REG_COMMAND, cmd);
 250        if (ret) {
 251                dev_warn(dev, "failed to write command, ret=%d\n", ret);
 252                goto out;
 253        }
 254        /* Sleep a little to ensure the command is received */
 255        msleep(SI1145_COMMAND_MINSLEEP_MS);
 256
 257        stop_jiffies = jiffies + SI1145_COMMAND_TIMEOUT_MS * HZ / 1000;
 258        while (true) {
 259                ret = i2c_smbus_read_byte_data(data->client,
 260                                               SI1145_REG_RESPONSE);
 261                if (ret < 0) {
 262                        dev_warn(dev, "failed to read response, ret=%d\n", ret);
 263                        break;
 264                }
 265
 266                if ((ret & ~SI1145_RSP_COUNTER_MASK) == 0) {
 267                        if (ret == data->rsp_seq) {
 268                                if (time_after(jiffies, stop_jiffies)) {
 269                                        dev_warn(dev, "timeout on command %#02hhx\n",
 270                                                 cmd);
 271                                        ret = -ETIMEDOUT;
 272                                        break;
 273                                }
 274                                msleep(SI1145_COMMAND_MINSLEEP_MS);
 275                                continue;
 276                        }
 277                        if (ret == ((data->rsp_seq + 1) &
 278                                SI1145_RSP_COUNTER_MASK)) {
 279                                data->rsp_seq = ret;
 280                                ret = 0;
 281                                break;
 282                        }
 283                        dev_warn(dev, "unexpected response counter %d instead of %d\n",
 284                                 ret, (data->rsp_seq + 1) &
 285                                        SI1145_RSP_COUNTER_MASK);
 286                        ret = -EIO;
 287                } else {
 288                        if (ret == SI1145_RSP_INVALID_SETTING) {
 289                                dev_warn(dev, "INVALID_SETTING error on command %#02hhx\n",
 290                                         cmd);
 291                                ret = -EINVAL;
 292                        } else {
 293                                /* All overflows are treated identically */
 294                                dev_dbg(dev, "overflow, ret=%d, cmd=%#02hhx\n",
 295                                        ret, cmd);
 296                                ret = -EOVERFLOW;
 297                        }
 298                }
 299
 300                /* Force a counter reset next time */
 301                data->rsp_seq = -1;
 302                break;
 303        }
 304
 305out:
 306        mutex_unlock(&data->cmdlock);
 307
 308        return ret;
 309}
 310
 311static int si1145_param_update(struct si1145_data *data, u8 op, u8 param,
 312                               u8 value)
 313{
 314        int ret;
 315
 316        ret = i2c_smbus_write_byte_data(data->client,
 317                SI1145_REG_PARAM_WR, value);
 318        if (ret < 0)
 319                return ret;
 320
 321        return si1145_command(data, op | (param & 0x1F));
 322}
 323
 324static int si1145_param_set(struct si1145_data *data, u8 param, u8 value)
 325{
 326        return si1145_param_update(data, SI1145_CMD_PARAM_SET, param, value);
 327}
 328
 329/* Set param. Returns negative errno or current value */
 330static int si1145_param_query(struct si1145_data *data, u8 param)
 331{
 332        int ret;
 333
 334        ret = si1145_command(data, SI1145_CMD_PARAM_QUERY | (param & 0x1F));
 335        if (ret < 0)
 336                return ret;
 337
 338        return i2c_smbus_read_byte_data(data->client, SI1145_REG_PARAM_RD);
 339}
 340
 341/* Expand 8 bit compressed value to 16 bit, see Silabs AN498 */
 342static u16 si1145_uncompress(u8 x)
 343{
 344        u16 result = 0;
 345        u8 exponent = 0;
 346
 347        if (x < 8)
 348                return 0;
 349
 350        exponent = (x & 0xf0) >> 4;
 351        result = 0x10 | (x & 0x0f);
 352
 353        if (exponent >= 4)
 354                return result << (exponent - 4);
 355        return result >> (4 - exponent);
 356}
 357
 358/* Compress 16 bit value to 8 bit, see Silabs AN498 */
 359static u8 si1145_compress(u16 x)
 360{
 361        u32 exponent = 0;
 362        u32 significand = 0;
 363        u32 tmp = x;
 364
 365        if (x == 0x0000)
 366                return 0x00;
 367        if (x == 0x0001)
 368                return 0x08;
 369
 370        while (1) {
 371                tmp >>= 1;
 372                exponent += 1;
 373                if (tmp == 1)
 374                        break;
 375        }
 376
 377        if (exponent < 5) {
 378                significand = x << (4 - exponent);
 379                return (exponent << 4) | (significand & 0xF);
 380        }
 381
 382        significand = x >> (exponent - 5);
 383        if (significand & 1) {
 384                significand += 2;
 385                if (significand & 0x0040) {
 386                        exponent += 1;
 387                        significand >>= 1;
 388                }
 389        }
 390
 391        return (exponent << 4) | ((significand >> 1) & 0xF);
 392}
 393
 394/* Write meas_rate in hardware */
 395static int si1145_set_meas_rate(struct si1145_data *data, int interval)
 396{
 397        if (data->part_info->uncompressed_meas_rate)
 398                return i2c_smbus_write_word_data(data->client,
 399                        SI1145_REG_MEAS_RATE, interval);
 400        else
 401                return i2c_smbus_write_byte_data(data->client,
 402                        SI1145_REG_MEAS_RATE, interval);
 403}
 404
 405static int si1145_read_samp_freq(struct si1145_data *data, int *val, int *val2)
 406{
 407        *val = 32000;
 408        if (data->part_info->uncompressed_meas_rate)
 409                *val2 = data->meas_rate;
 410        else
 411                *val2 = si1145_uncompress(data->meas_rate);
 412        return IIO_VAL_FRACTIONAL;
 413}
 414
 415/* Set the samp freq in driver private data */
 416static int si1145_store_samp_freq(struct si1145_data *data, int val)
 417{
 418        int ret = 0;
 419        int meas_rate;
 420
 421        if (val <= 0 || val > 32000)
 422                return -ERANGE;
 423        meas_rate = 32000 / val;
 424
 425        mutex_lock(&data->lock);
 426        if (data->autonomous) {
 427                ret = si1145_set_meas_rate(data, meas_rate);
 428                if (ret)
 429                        goto out;
 430        }
 431        if (data->part_info->uncompressed_meas_rate)
 432                data->meas_rate = meas_rate;
 433        else
 434                data->meas_rate = si1145_compress(meas_rate);
 435
 436out:
 437        mutex_unlock(&data->lock);
 438
 439        return ret;
 440}
 441
 442static irqreturn_t si1145_trigger_handler(int irq, void *private)
 443{
 444        struct iio_poll_func *pf = private;
 445        struct iio_dev *indio_dev = pf->indio_dev;
 446        struct si1145_data *data = iio_priv(indio_dev);
 447        /*
 448         * Maximum buffer size:
 449         *   6*2 bytes channels data + 4 bytes alignment +
 450         *   8 bytes timestamp
 451         */
 452        u8 buffer[24];
 453        int i, j = 0;
 454        int ret;
 455        u8 irq_status = 0;
 456
 457        if (!data->autonomous) {
 458                ret = si1145_command(data, SI1145_CMD_PSALS_FORCE);
 459                if (ret < 0 && ret != -EOVERFLOW)
 460                        goto done;
 461        } else {
 462                irq_status = ret = i2c_smbus_read_byte_data(data->client,
 463                                SI1145_REG_IRQ_STATUS);
 464                if (ret < 0)
 465                        goto done;
 466                if (!(irq_status & SI1145_MASK_ALL_IE))
 467                        goto done;
 468        }
 469
 470        for_each_set_bit(i, indio_dev->active_scan_mask,
 471                indio_dev->masklength) {
 472                int run = 1;
 473
 474                while (i + run < indio_dev->masklength) {
 475                        if (!test_bit(i + run, indio_dev->active_scan_mask))
 476                                break;
 477                        if (indio_dev->channels[i + run].address !=
 478                                indio_dev->channels[i].address + 2 * run)
 479                                break;
 480                        run++;
 481                }
 482
 483                ret = i2c_smbus_read_i2c_block_data_or_emulated(
 484                                data->client, indio_dev->channels[i].address,
 485                                sizeof(u16) * run, &buffer[j]);
 486                if (ret < 0)
 487                        goto done;
 488                j += run * sizeof(u16);
 489                i += run - 1;
 490        }
 491
 492        if (data->autonomous) {
 493                ret = i2c_smbus_write_byte_data(data->client,
 494                                SI1145_REG_IRQ_STATUS,
 495                                irq_status & SI1145_MASK_ALL_IE);
 496                if (ret < 0)
 497                        goto done;
 498        }
 499
 500        iio_push_to_buffers_with_timestamp(indio_dev, buffer,
 501                iio_get_time_ns(indio_dev));
 502
 503done:
 504        iio_trigger_notify_done(indio_dev->trig);
 505        return IRQ_HANDLED;
 506}
 507
 508static int si1145_set_chlist(struct iio_dev *indio_dev, unsigned long scan_mask)
 509{
 510        struct si1145_data *data = iio_priv(indio_dev);
 511        u8 reg = 0, mux;
 512        int ret;
 513        int i;
 514
 515        /* channel list already set, no need to reprogram */
 516        if (data->scan_mask == scan_mask)
 517                return 0;
 518
 519        for_each_set_bit(i, &scan_mask, indio_dev->masklength) {
 520                switch (indio_dev->channels[i].address) {
 521                case SI1145_REG_ALSVIS_DATA:
 522                        reg |= SI1145_CHLIST_EN_ALSVIS;
 523                        break;
 524                case SI1145_REG_ALSIR_DATA:
 525                        reg |= SI1145_CHLIST_EN_ALSIR;
 526                        break;
 527                case SI1145_REG_PS1_DATA:
 528                        reg |= SI1145_CHLIST_EN_PS1;
 529                        break;
 530                case SI1145_REG_PS2_DATA:
 531                        reg |= SI1145_CHLIST_EN_PS2;
 532                        break;
 533                case SI1145_REG_PS3_DATA:
 534                        reg |= SI1145_CHLIST_EN_PS3;
 535                        break;
 536                case SI1145_REG_AUX_DATA:
 537                        switch (indio_dev->channels[i].type) {
 538                        case IIO_UVINDEX:
 539                                reg |= SI1145_CHLIST_EN_UV;
 540                                break;
 541                        default:
 542                                reg |= SI1145_CHLIST_EN_AUX;
 543                                if (indio_dev->channels[i].type == IIO_TEMP)
 544                                        mux = SI1145_MUX_TEMP;
 545                                else
 546                                        mux = SI1145_MUX_VDD;
 547                                ret = si1145_param_set(data,
 548                                        SI1145_PARAM_AUX_ADC_MUX, mux);
 549                                if (ret < 0)
 550                                        return ret;
 551
 552                                break;
 553                        }
 554                }
 555        }
 556
 557        data->scan_mask = scan_mask;
 558        ret = si1145_param_set(data, SI1145_PARAM_CHLIST, reg);
 559
 560        return ret < 0 ? ret : 0;
 561}
 562
 563static int si1145_measure(struct iio_dev *indio_dev,
 564                          struct iio_chan_spec const *chan)
 565{
 566        struct si1145_data *data = iio_priv(indio_dev);
 567        u8 cmd;
 568        int ret;
 569
 570        ret = si1145_set_chlist(indio_dev, BIT(chan->scan_index));
 571        if (ret < 0)
 572                return ret;
 573
 574        cmd = (chan->type == IIO_PROXIMITY) ? SI1145_CMD_PS_FORCE :
 575                SI1145_CMD_ALS_FORCE;
 576        ret = si1145_command(data, cmd);
 577        if (ret < 0 && ret != -EOVERFLOW)
 578                return ret;
 579
 580        return i2c_smbus_read_word_data(data->client, chan->address);
 581}
 582
 583/*
 584 * Conversion between iio scale and ADC_GAIN values
 585 * These could be further adjusted but proximity/intensity are dimensionless
 586 */
 587static const int si1145_proximity_scale_available[] = {
 588        128, 64, 32, 16, 8, 4};
 589static const int si1145_intensity_scale_available[] = {
 590        128, 64, 32, 16, 8, 4, 2, 1};
 591static IIO_CONST_ATTR(in_proximity_scale_available,
 592        "128 64 32 16 8 4");
 593static IIO_CONST_ATTR(in_intensity_scale_available,
 594        "128 64 32 16 8 4 2 1");
 595static IIO_CONST_ATTR(in_intensity_ir_scale_available,
 596        "128 64 32 16 8 4 2 1");
 597
 598static int si1145_scale_from_adcgain(int regval)
 599{
 600        return 128 >> regval;
 601}
 602
 603static int si1145_proximity_adcgain_from_scale(int val, int val2)
 604{
 605        val = find_closest_descending(val, si1145_proximity_scale_available,
 606                                ARRAY_SIZE(si1145_proximity_scale_available));
 607        if (val < 0 || val > 5 || val2 != 0)
 608                return -EINVAL;
 609
 610        return val;
 611}
 612
 613static int si1145_intensity_adcgain_from_scale(int val, int val2)
 614{
 615        val = find_closest_descending(val, si1145_intensity_scale_available,
 616                                ARRAY_SIZE(si1145_intensity_scale_available));
 617        if (val < 0 || val > 7 || val2 != 0)
 618                return -EINVAL;
 619
 620        return val;
 621}
 622
 623static int si1145_read_raw(struct iio_dev *indio_dev,
 624                                struct iio_chan_spec const *chan,
 625                                int *val, int *val2, long mask)
 626{
 627        struct si1145_data *data = iio_priv(indio_dev);
 628        int ret;
 629        u8 reg;
 630
 631        switch (mask) {
 632        case IIO_CHAN_INFO_RAW:
 633                switch (chan->type) {
 634                case IIO_INTENSITY:
 635                case IIO_PROXIMITY:
 636                case IIO_VOLTAGE:
 637                case IIO_TEMP:
 638                case IIO_UVINDEX:
 639                        ret = iio_device_claim_direct_mode(indio_dev);
 640                        if (ret)
 641                                return ret;
 642                        ret = si1145_measure(indio_dev, chan);
 643                        iio_device_release_direct_mode(indio_dev);
 644
 645                        if (ret < 0)
 646                                return ret;
 647
 648                        *val = ret;
 649
 650                        return IIO_VAL_INT;
 651                case IIO_CURRENT:
 652                        ret = i2c_smbus_read_byte_data(data->client,
 653                                SI1145_PS_LED_REG(chan->channel));
 654                        if (ret < 0)
 655                                return ret;
 656
 657                        *val = (ret >> SI1145_PS_LED_SHIFT(chan->channel))
 658                                & 0x0f;
 659
 660                        return IIO_VAL_INT;
 661                default:
 662                        return -EINVAL;
 663                }
 664        case IIO_CHAN_INFO_SCALE:
 665                switch (chan->type) {
 666                case IIO_PROXIMITY:
 667                        reg = SI1145_PARAM_PS_ADC_GAIN;
 668                        break;
 669                case IIO_INTENSITY:
 670                        if (chan->channel2 == IIO_MOD_LIGHT_IR)
 671                                reg = SI1145_PARAM_ALSIR_ADC_GAIN;
 672                        else
 673                                reg = SI1145_PARAM_ALSVIS_ADC_GAIN;
 674                        break;
 675                case IIO_TEMP:
 676                        *val = 28;
 677                        *val2 = 571429;
 678                        return IIO_VAL_INT_PLUS_MICRO;
 679                case IIO_UVINDEX:
 680                        *val = 0;
 681                        *val2 = 10000;
 682                        return IIO_VAL_INT_PLUS_MICRO;
 683                default:
 684                        return -EINVAL;
 685                }
 686
 687                ret = si1145_param_query(data, reg);
 688                if (ret < 0)
 689                        return ret;
 690
 691                *val = si1145_scale_from_adcgain(ret & 0x07);
 692
 693                return IIO_VAL_INT;
 694        case IIO_CHAN_INFO_OFFSET:
 695                switch (chan->type) {
 696                case IIO_TEMP:
 697                        /*
 698                         * -ADC offset - ADC counts @ 25°C -
 699                         *   35 * ADC counts / °C
 700                         */
 701                        *val = -256 - 11136 + 25 * 35;
 702                        return IIO_VAL_INT;
 703                default:
 704                        /*
 705                         * All ADC measurements have are by default offset
 706                         * by -256
 707                         * See AN498 5.6.3
 708                         */
 709                        ret = si1145_param_query(data, SI1145_PARAM_ADC_OFFSET);
 710                        if (ret < 0)
 711                                return ret;
 712                        *val = -si1145_uncompress(ret);
 713                        return IIO_VAL_INT;
 714                }
 715        case IIO_CHAN_INFO_SAMP_FREQ:
 716                return si1145_read_samp_freq(data, val, val2);
 717        default:
 718                return -EINVAL;
 719        }
 720}
 721
 722static int si1145_write_raw(struct iio_dev *indio_dev,
 723                               struct iio_chan_spec const *chan,
 724                               int val, int val2, long mask)
 725{
 726        struct si1145_data *data = iio_priv(indio_dev);
 727        u8 reg1, reg2, shift;
 728        int ret;
 729
 730        switch (mask) {
 731        case IIO_CHAN_INFO_SCALE:
 732                switch (chan->type) {
 733                case IIO_PROXIMITY:
 734                        val = si1145_proximity_adcgain_from_scale(val, val2);
 735                        if (val < 0)
 736                                return val;
 737                        reg1 = SI1145_PARAM_PS_ADC_GAIN;
 738                        reg2 = SI1145_PARAM_PS_ADC_COUNTER;
 739                        break;
 740                case IIO_INTENSITY:
 741                        val = si1145_intensity_adcgain_from_scale(val, val2);
 742                        if (val < 0)
 743                                return val;
 744                        if (chan->channel2 == IIO_MOD_LIGHT_IR) {
 745                                reg1 = SI1145_PARAM_ALSIR_ADC_GAIN;
 746                                reg2 = SI1145_PARAM_ALSIR_ADC_COUNTER;
 747                        } else {
 748                                reg1 = SI1145_PARAM_ALSVIS_ADC_GAIN;
 749                                reg2 = SI1145_PARAM_ALSVIS_ADC_COUNTER;
 750                        }
 751                        break;
 752                default:
 753                        return -EINVAL;
 754                }
 755
 756                ret = iio_device_claim_direct_mode(indio_dev);
 757                if (ret)
 758                        return ret;
 759
 760                ret = si1145_param_set(data, reg1, val);
 761                if (ret < 0) {
 762                        iio_device_release_direct_mode(indio_dev);
 763                        return ret;
 764                }
 765                /* Set recovery period to one's complement of gain */
 766                ret = si1145_param_set(data, reg2, (~val & 0x07) << 4);
 767                iio_device_release_direct_mode(indio_dev);
 768                return ret;
 769        case IIO_CHAN_INFO_RAW:
 770                if (chan->type != IIO_CURRENT)
 771                        return -EINVAL;
 772
 773                if (val < 0 || val > 15 || val2 != 0)
 774                        return -EINVAL;
 775
 776                reg1 = SI1145_PS_LED_REG(chan->channel);
 777                shift = SI1145_PS_LED_SHIFT(chan->channel);
 778
 779                ret = iio_device_claim_direct_mode(indio_dev);
 780                if (ret)
 781                        return ret;
 782
 783                ret = i2c_smbus_read_byte_data(data->client, reg1);
 784                if (ret < 0) {
 785                        iio_device_release_direct_mode(indio_dev);
 786                        return ret;
 787                }
 788                ret = i2c_smbus_write_byte_data(data->client, reg1,
 789                        (ret & ~(0x0f << shift)) |
 790                        ((val & 0x0f) << shift));
 791                iio_device_release_direct_mode(indio_dev);
 792                return ret;
 793        case IIO_CHAN_INFO_SAMP_FREQ:
 794                return si1145_store_samp_freq(data, val);
 795        default:
 796                return -EINVAL;
 797        }
 798}
 799
 800#define SI1145_ST { \
 801        .sign = 'u', \
 802        .realbits = 16, \
 803        .storagebits = 16, \
 804        .endianness = IIO_LE, \
 805}
 806
 807#define SI1145_INTENSITY_CHANNEL(_si) { \
 808        .type = IIO_INTENSITY, \
 809        .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
 810                              BIT(IIO_CHAN_INFO_OFFSET) | \
 811                              BIT(IIO_CHAN_INFO_SCALE), \
 812        .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
 813        .scan_type = SI1145_ST, \
 814        .scan_index = _si, \
 815        .address = SI1145_REG_ALSVIS_DATA, \
 816}
 817
 818#define SI1145_INTENSITY_IR_CHANNEL(_si) { \
 819        .type = IIO_INTENSITY, \
 820        .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
 821                              BIT(IIO_CHAN_INFO_OFFSET) | \
 822                              BIT(IIO_CHAN_INFO_SCALE), \
 823        .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
 824        .modified = 1, \
 825        .channel2 = IIO_MOD_LIGHT_IR, \
 826        .scan_type = SI1145_ST, \
 827        .scan_index = _si, \
 828        .address = SI1145_REG_ALSIR_DATA, \
 829}
 830
 831#define SI1145_TEMP_CHANNEL(_si) { \
 832        .type = IIO_TEMP, \
 833        .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
 834                              BIT(IIO_CHAN_INFO_OFFSET) | \
 835                              BIT(IIO_CHAN_INFO_SCALE), \
 836        .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
 837        .scan_type = SI1145_ST, \
 838        .scan_index = _si, \
 839        .address = SI1145_REG_AUX_DATA, \
 840}
 841
 842#define SI1145_UV_CHANNEL(_si) { \
 843        .type = IIO_UVINDEX, \
 844        .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
 845                              BIT(IIO_CHAN_INFO_SCALE), \
 846        .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
 847        .scan_type = SI1145_ST, \
 848        .scan_index = _si, \
 849        .address = SI1145_REG_AUX_DATA, \
 850}
 851
 852#define SI1145_PROXIMITY_CHANNEL(_si, _ch) { \
 853        .type = IIO_PROXIMITY, \
 854        .indexed = 1, \
 855        .channel = _ch, \
 856        .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
 857        .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
 858                                    BIT(IIO_CHAN_INFO_OFFSET), \
 859        .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
 860        .scan_type = SI1145_ST, \
 861        .scan_index = _si, \
 862        .address = SI1145_REG_PS1_DATA + _ch * 2, \
 863}
 864
 865#define SI1145_VOLTAGE_CHANNEL(_si) { \
 866        .type = IIO_VOLTAGE, \
 867        .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
 868        .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
 869        .scan_type = SI1145_ST, \
 870        .scan_index = _si, \
 871        .address = SI1145_REG_AUX_DATA, \
 872}
 873
 874#define SI1145_CURRENT_CHANNEL(_ch) { \
 875        .type = IIO_CURRENT, \
 876        .indexed = 1, \
 877        .channel = _ch, \
 878        .output = 1, \
 879        .scan_index = -1, \
 880        .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
 881}
 882
 883static const struct iio_chan_spec si1132_channels[] = {
 884        SI1145_INTENSITY_CHANNEL(0),
 885        SI1145_INTENSITY_IR_CHANNEL(1),
 886        SI1145_TEMP_CHANNEL(2),
 887        SI1145_VOLTAGE_CHANNEL(3),
 888        SI1145_UV_CHANNEL(4),
 889        IIO_CHAN_SOFT_TIMESTAMP(6),
 890};
 891
 892static const struct iio_chan_spec si1141_channels[] = {
 893        SI1145_INTENSITY_CHANNEL(0),
 894        SI1145_INTENSITY_IR_CHANNEL(1),
 895        SI1145_PROXIMITY_CHANNEL(2, 0),
 896        SI1145_TEMP_CHANNEL(3),
 897        SI1145_VOLTAGE_CHANNEL(4),
 898        IIO_CHAN_SOFT_TIMESTAMP(5),
 899        SI1145_CURRENT_CHANNEL(0),
 900};
 901
 902static const struct iio_chan_spec si1142_channels[] = {
 903        SI1145_INTENSITY_CHANNEL(0),
 904        SI1145_INTENSITY_IR_CHANNEL(1),
 905        SI1145_PROXIMITY_CHANNEL(2, 0),
 906        SI1145_PROXIMITY_CHANNEL(3, 1),
 907        SI1145_TEMP_CHANNEL(4),
 908        SI1145_VOLTAGE_CHANNEL(5),
 909        IIO_CHAN_SOFT_TIMESTAMP(6),
 910        SI1145_CURRENT_CHANNEL(0),
 911        SI1145_CURRENT_CHANNEL(1),
 912};
 913
 914static const struct iio_chan_spec si1143_channels[] = {
 915        SI1145_INTENSITY_CHANNEL(0),
 916        SI1145_INTENSITY_IR_CHANNEL(1),
 917        SI1145_PROXIMITY_CHANNEL(2, 0),
 918        SI1145_PROXIMITY_CHANNEL(3, 1),
 919        SI1145_PROXIMITY_CHANNEL(4, 2),
 920        SI1145_TEMP_CHANNEL(5),
 921        SI1145_VOLTAGE_CHANNEL(6),
 922        IIO_CHAN_SOFT_TIMESTAMP(7),
 923        SI1145_CURRENT_CHANNEL(0),
 924        SI1145_CURRENT_CHANNEL(1),
 925        SI1145_CURRENT_CHANNEL(2),
 926};
 927
 928static const struct iio_chan_spec si1145_channels[] = {
 929        SI1145_INTENSITY_CHANNEL(0),
 930        SI1145_INTENSITY_IR_CHANNEL(1),
 931        SI1145_PROXIMITY_CHANNEL(2, 0),
 932        SI1145_TEMP_CHANNEL(3),
 933        SI1145_VOLTAGE_CHANNEL(4),
 934        SI1145_UV_CHANNEL(5),
 935        IIO_CHAN_SOFT_TIMESTAMP(6),
 936        SI1145_CURRENT_CHANNEL(0),
 937};
 938
 939static const struct iio_chan_spec si1146_channels[] = {
 940        SI1145_INTENSITY_CHANNEL(0),
 941        SI1145_INTENSITY_IR_CHANNEL(1),
 942        SI1145_TEMP_CHANNEL(2),
 943        SI1145_VOLTAGE_CHANNEL(3),
 944        SI1145_UV_CHANNEL(4),
 945        SI1145_PROXIMITY_CHANNEL(5, 0),
 946        SI1145_PROXIMITY_CHANNEL(6, 1),
 947        IIO_CHAN_SOFT_TIMESTAMP(7),
 948        SI1145_CURRENT_CHANNEL(0),
 949        SI1145_CURRENT_CHANNEL(1),
 950};
 951
 952static const struct iio_chan_spec si1147_channels[] = {
 953        SI1145_INTENSITY_CHANNEL(0),
 954        SI1145_INTENSITY_IR_CHANNEL(1),
 955        SI1145_PROXIMITY_CHANNEL(2, 0),
 956        SI1145_PROXIMITY_CHANNEL(3, 1),
 957        SI1145_PROXIMITY_CHANNEL(4, 2),
 958        SI1145_TEMP_CHANNEL(5),
 959        SI1145_VOLTAGE_CHANNEL(6),
 960        SI1145_UV_CHANNEL(7),
 961        IIO_CHAN_SOFT_TIMESTAMP(8),
 962        SI1145_CURRENT_CHANNEL(0),
 963        SI1145_CURRENT_CHANNEL(1),
 964        SI1145_CURRENT_CHANNEL(2),
 965};
 966
 967static struct attribute *si1132_attributes[] = {
 968        &iio_const_attr_in_intensity_scale_available.dev_attr.attr,
 969        &iio_const_attr_in_intensity_ir_scale_available.dev_attr.attr,
 970        NULL,
 971};
 972
 973static struct attribute *si114x_attributes[] = {
 974        &iio_const_attr_in_intensity_scale_available.dev_attr.attr,
 975        &iio_const_attr_in_intensity_ir_scale_available.dev_attr.attr,
 976        &iio_const_attr_in_proximity_scale_available.dev_attr.attr,
 977        NULL,
 978};
 979
 980static const struct attribute_group si1132_attribute_group = {
 981        .attrs = si1132_attributes,
 982};
 983
 984static const struct attribute_group si114x_attribute_group = {
 985        .attrs = si114x_attributes,
 986};
 987
 988
 989static const struct iio_info si1132_info = {
 990        .read_raw = si1145_read_raw,
 991        .write_raw = si1145_write_raw,
 992        .driver_module = THIS_MODULE,
 993        .attrs = &si1132_attribute_group,
 994};
 995
 996static const struct iio_info si114x_info = {
 997        .read_raw = si1145_read_raw,
 998        .write_raw = si1145_write_raw,
 999        .driver_module = THIS_MODULE,
1000        .attrs = &si114x_attribute_group,
1001};
1002
1003#define SI1145_PART(id, iio_info, chans, leds, uncompressed_meas_rate) \
1004        {id, iio_info, chans, ARRAY_SIZE(chans), leds, uncompressed_meas_rate}
1005
1006static const struct si1145_part_info si1145_part_info[] = {
1007        [SI1132] = SI1145_PART(0x32, &si1132_info, si1132_channels, 0, true),
1008        [SI1141] = SI1145_PART(0x41, &si114x_info, si1141_channels, 1, false),
1009        [SI1142] = SI1145_PART(0x42, &si114x_info, si1142_channels, 2, false),
1010        [SI1143] = SI1145_PART(0x43, &si114x_info, si1143_channels, 3, false),
1011        [SI1145] = SI1145_PART(0x45, &si114x_info, si1145_channels, 1, true),
1012        [SI1146] = SI1145_PART(0x46, &si114x_info, si1146_channels, 2, true),
1013        [SI1147] = SI1145_PART(0x47, &si114x_info, si1147_channels, 3, true),
1014};
1015
1016static int si1145_initialize(struct si1145_data *data)
1017{
1018        struct i2c_client *client = data->client;
1019        int ret;
1020
1021        ret = i2c_smbus_write_byte_data(client, SI1145_REG_COMMAND,
1022                                        SI1145_CMD_RESET);
1023        if (ret < 0)
1024                return ret;
1025        msleep(SI1145_COMMAND_TIMEOUT_MS);
1026
1027        /* Hardware key, magic value */
1028        ret = i2c_smbus_write_byte_data(client, SI1145_REG_HW_KEY, 0x17);
1029        if (ret < 0)
1030                return ret;
1031        msleep(SI1145_COMMAND_TIMEOUT_MS);
1032
1033        /* Turn off autonomous mode */
1034        ret = si1145_set_meas_rate(data, 0);
1035        if (ret < 0)
1036                return ret;
1037
1038        /* Initialize sampling freq to 10 Hz */
1039        ret = si1145_store_samp_freq(data, 10);
1040        if (ret < 0)
1041                return ret;
1042
1043        /* Set LED currents to 45 mA; have 4 bits, see Table 2 in datasheet */
1044        switch (data->part_info->num_leds) {
1045        case 3:
1046                ret = i2c_smbus_write_byte_data(client,
1047                                                SI1145_REG_PS_LED3,
1048                                                SI1145_LED_CURRENT_45mA);
1049                if (ret < 0)
1050                        return ret;
1051                /* fallthrough */
1052        case 2:
1053                ret = i2c_smbus_write_byte_data(client,
1054                                                SI1145_REG_PS_LED21,
1055                                                (SI1145_LED_CURRENT_45mA << 4) |
1056                                                SI1145_LED_CURRENT_45mA);
1057                break;
1058        case 1:
1059                ret = i2c_smbus_write_byte_data(client,
1060                                                SI1145_REG_PS_LED21,
1061                                                SI1145_LED_CURRENT_45mA);
1062                break;
1063        default:
1064                ret = 0;
1065                break;
1066        }
1067        if (ret < 0)
1068                return ret;
1069
1070        /* Set normal proximity measurement mode */
1071        ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_MISC,
1072                               SI1145_PS_ADC_MODE_NORMAL);
1073        if (ret < 0)
1074                return ret;
1075
1076        ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_GAIN, 0x01);
1077        if (ret < 0)
1078                return ret;
1079
1080        /* ADC_COUNTER should be one complement of ADC_GAIN */
1081        ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_COUNTER, 0x06 << 4);
1082        if (ret < 0)
1083                return ret;
1084
1085        /* Set ALS visible measurement mode */
1086        ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_MISC,
1087                               SI1145_ADC_MISC_RANGE);
1088        if (ret < 0)
1089                return ret;
1090
1091        ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_GAIN, 0x03);
1092        if (ret < 0)
1093                return ret;
1094
1095        ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_COUNTER,
1096                               0x04 << 4);
1097        if (ret < 0)
1098                return ret;
1099
1100        /* Set ALS IR measurement mode */
1101        ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_MISC,
1102                               SI1145_ADC_MISC_RANGE);
1103        if (ret < 0)
1104                return ret;
1105
1106        ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_GAIN, 0x01);
1107        if (ret < 0)
1108                return ret;
1109
1110        ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_COUNTER,
1111                               0x06 << 4);
1112        if (ret < 0)
1113                return ret;
1114
1115        /*
1116         * Initialize UCOEF to default values in datasheet
1117         * These registers are normally zero on reset
1118         */
1119        if (data->part_info == &si1145_part_info[SI1132] ||
1120                data->part_info == &si1145_part_info[SI1145] ||
1121                data->part_info == &si1145_part_info[SI1146] ||
1122                data->part_info == &si1145_part_info[SI1147]) {
1123                ret = i2c_smbus_write_byte_data(data->client,
1124                                                SI1145_REG_UCOEF1,
1125                                                SI1145_UCOEF1_DEFAULT);
1126                if (ret < 0)
1127                        return ret;
1128                ret = i2c_smbus_write_byte_data(data->client,
1129                                SI1145_REG_UCOEF2, SI1145_UCOEF2_DEFAULT);
1130                if (ret < 0)
1131                        return ret;
1132                ret = i2c_smbus_write_byte_data(data->client,
1133                                SI1145_REG_UCOEF3, SI1145_UCOEF3_DEFAULT);
1134                if (ret < 0)
1135                        return ret;
1136                ret = i2c_smbus_write_byte_data(data->client,
1137                                SI1145_REG_UCOEF4, SI1145_UCOEF4_DEFAULT);
1138                if (ret < 0)
1139                        return ret;
1140        }
1141
1142        return 0;
1143}
1144
1145/*
1146 * Program the channels we want to measure with CMD_PSALS_AUTO. No need for
1147 * _postdisable as we stop with CMD_PSALS_PAUSE; single measurement (direct)
1148 * mode reprograms the channels list anyway...
1149 */
1150static int si1145_buffer_preenable(struct iio_dev *indio_dev)
1151{
1152        struct si1145_data *data = iio_priv(indio_dev);
1153        int ret;
1154
1155        mutex_lock(&data->lock);
1156        ret = si1145_set_chlist(indio_dev, *indio_dev->active_scan_mask);
1157        mutex_unlock(&data->lock);
1158
1159        return ret;
1160}
1161
1162static bool si1145_validate_scan_mask(struct iio_dev *indio_dev,
1163                               const unsigned long *scan_mask)
1164{
1165        struct si1145_data *data = iio_priv(indio_dev);
1166        unsigned int count = 0;
1167        int i;
1168
1169        /* Check that at most one AUX channel is enabled */
1170        for_each_set_bit(i, scan_mask, data->part_info->num_channels) {
1171                if (indio_dev->channels[i].address == SI1145_REG_AUX_DATA)
1172                        count++;
1173        }
1174
1175        return count <= 1;
1176}
1177
1178static const struct iio_buffer_setup_ops si1145_buffer_setup_ops = {
1179        .preenable = si1145_buffer_preenable,
1180        .postenable = iio_triggered_buffer_postenable,
1181        .predisable = iio_triggered_buffer_predisable,
1182        .validate_scan_mask = si1145_validate_scan_mask,
1183};
1184
1185/**
1186 * si1145_trigger_set_state() - Set trigger state
1187 *
1188 * When not using triggers interrupts are disabled and measurement rate is
1189 * set to zero in order to minimize power consumption.
1190 */
1191static int si1145_trigger_set_state(struct iio_trigger *trig, bool state)
1192{
1193        struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
1194        struct si1145_data *data = iio_priv(indio_dev);
1195        int err = 0, ret;
1196
1197        mutex_lock(&data->lock);
1198
1199        if (state) {
1200                data->autonomous = true;
1201                err = i2c_smbus_write_byte_data(data->client,
1202                                SI1145_REG_INT_CFG, SI1145_INT_CFG_OE);
1203                if (err < 0)
1204                        goto disable;
1205                err = i2c_smbus_write_byte_data(data->client,
1206                                SI1145_REG_IRQ_ENABLE, SI1145_MASK_ALL_IE);
1207                if (err < 0)
1208                        goto disable;
1209                err = si1145_set_meas_rate(data, data->meas_rate);
1210                if (err < 0)
1211                        goto disable;
1212                err = si1145_command(data, SI1145_CMD_PSALS_AUTO);
1213                if (err < 0)
1214                        goto disable;
1215        } else {
1216disable:
1217                /* Disable as much as possible skipping errors */
1218                ret = si1145_command(data, SI1145_CMD_PSALS_PAUSE);
1219                if (ret < 0 && !err)
1220                        err = ret;
1221                ret = si1145_set_meas_rate(data, 0);
1222                if (ret < 0 && !err)
1223                        err = ret;
1224                ret = i2c_smbus_write_byte_data(data->client,
1225                                                SI1145_REG_IRQ_ENABLE, 0);
1226                if (ret < 0 && !err)
1227                        err = ret;
1228                ret = i2c_smbus_write_byte_data(data->client,
1229                                                SI1145_REG_INT_CFG, 0);
1230                if (ret < 0 && !err)
1231                        err = ret;
1232                data->autonomous = false;
1233        }
1234
1235        mutex_unlock(&data->lock);
1236        return err;
1237}
1238
1239static const struct iio_trigger_ops si1145_trigger_ops = {
1240        .owner = THIS_MODULE,
1241        .set_trigger_state = si1145_trigger_set_state,
1242};
1243
1244static 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
1280static 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
1290static 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
1360error_free_trigger:
1361        si1145_remove_trigger(indio_dev);
1362error_free_buffer:
1363        iio_triggered_buffer_cleanup(indio_dev);
1364
1365        return ret;
1366}
1367
1368static 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};
1378MODULE_DEVICE_TABLE(i2c, si1145_ids);
1379
1380static 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
1391static 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
1400module_i2c_driver(si1145_driver);
1401
1402MODULE_AUTHOR("Peter Meerwald-Stadler <pmeerw@pmeerw.net>");
1403MODULE_DESCRIPTION("Silabs SI1132 and SI1141/2/3/5/6/7 proximity, ambient light and UV index sensor driver");
1404MODULE_LICENSE("GPL");
1405