drivers/iio/light/rpr0521.c

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This source file includes following definitions.
rpr0521_als_enable
rpr0521_pxs_enable
rpr0521_set_power_state
rpr0521_is_triggered
rpr0521_drdy_irq_handler
rpr0521_drdy_irq_thread
rpr0521_trigger_consumer_store_time
rpr0521_trigger_consumer_handler
rpr0521_write_int_enable
rpr0521_write_int_disable
rpr0521_pxs_drdy_set_state
rpr0521_buffer_preenable
rpr0521_buffer_postdisable
rpr0521_get_gain
rpr0521_set_gain
rpr0521_read_samp_freq
rpr0521_write_samp_freq_common
rpr0521_read_ps_offset
rpr0521_write_ps_offset
rpr0521_read_raw
rpr0521_write_raw
rpr0521_init
rpr0521_poweroff
rpr0521_is_volatile_reg
rpr0521_probe
rpr0521_remove
rpr0521_runtime_suspend
rpr0521_runtime_resume
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * RPR-0521 ROHM Ambient Light and Proximity Sensor
   4  *
   5  * Copyright (c) 2015, Intel Corporation.
   6  *
   7  * IIO driver for RPR-0521RS (7-bit I2C slave address 0x38).
   8  *
   9  * TODO: illuminance channel
  10  */
  11 
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/i2c.h>
  15 #include <linux/regmap.h>
  16 #include <linux/delay.h>
  17 #include <linux/acpi.h>
  18 
  19 #include <linux/iio/iio.h>
  20 #include <linux/iio/buffer.h>
  21 #include <linux/iio/trigger.h>
  22 #include <linux/iio/trigger_consumer.h>
  23 #include <linux/iio/triggered_buffer.h>
  24 #include <linux/iio/sysfs.h>
  25 #include <linux/pm_runtime.h>
  26 
  27 #define RPR0521_REG_SYSTEM_CTRL         0x40
  28 #define RPR0521_REG_MODE_CTRL           0x41
  29 #define RPR0521_REG_ALS_CTRL            0x42
  30 #define RPR0521_REG_PXS_CTRL            0x43
  31 #define RPR0521_REG_PXS_DATA            0x44 /* 16-bit, little endian */
  32 #define RPR0521_REG_ALS_DATA0           0x46 /* 16-bit, little endian */
  33 #define RPR0521_REG_ALS_DATA1           0x48 /* 16-bit, little endian */
  34 #define RPR0521_REG_INTERRUPT           0x4A
  35 #define RPR0521_REG_PS_OFFSET_LSB       0x53
  36 #define RPR0521_REG_ID                  0x92
  37 
  38 #define RPR0521_MODE_ALS_MASK           BIT(7)
  39 #define RPR0521_MODE_PXS_MASK           BIT(6)
  40 #define RPR0521_MODE_MEAS_TIME_MASK     GENMASK(3, 0)
  41 #define RPR0521_ALS_DATA0_GAIN_MASK     GENMASK(5, 4)
  42 #define RPR0521_ALS_DATA0_GAIN_SHIFT    4
  43 #define RPR0521_ALS_DATA1_GAIN_MASK     GENMASK(3, 2)
  44 #define RPR0521_ALS_DATA1_GAIN_SHIFT    2
  45 #define RPR0521_PXS_GAIN_MASK           GENMASK(5, 4)
  46 #define RPR0521_PXS_GAIN_SHIFT          4
  47 #define RPR0521_PXS_PERSISTENCE_MASK    GENMASK(3, 0)
  48 #define RPR0521_INTERRUPT_INT_TRIG_PS_MASK      BIT(0)
  49 #define RPR0521_INTERRUPT_INT_TRIG_ALS_MASK     BIT(1)
  50 #define RPR0521_INTERRUPT_INT_REASSERT_MASK     BIT(3)
  51 #define RPR0521_INTERRUPT_ALS_INT_STATUS_MASK   BIT(6)
  52 #define RPR0521_INTERRUPT_PS_INT_STATUS_MASK    BIT(7)
  53 
  54 #define RPR0521_MODE_ALS_ENABLE         BIT(7)
  55 #define RPR0521_MODE_ALS_DISABLE        0x00
  56 #define RPR0521_MODE_PXS_ENABLE         BIT(6)
  57 #define RPR0521_MODE_PXS_DISABLE        0x00
  58 #define RPR0521_PXS_PERSISTENCE_DRDY    0x00
  59 
  60 #define RPR0521_INTERRUPT_INT_TRIG_PS_ENABLE    BIT(0)
  61 #define RPR0521_INTERRUPT_INT_TRIG_PS_DISABLE   0x00
  62 #define RPR0521_INTERRUPT_INT_TRIG_ALS_ENABLE   BIT(1)
  63 #define RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE  0x00
  64 #define RPR0521_INTERRUPT_INT_REASSERT_ENABLE   BIT(3)
  65 #define RPR0521_INTERRUPT_INT_REASSERT_DISABLE  0x00
  66 
  67 #define RPR0521_MANUFACT_ID             0xE0
  68 #define RPR0521_DEFAULT_MEAS_TIME       0x06 /* ALS - 100ms, PXS - 100ms */
  69 
  70 #define RPR0521_DRV_NAME                "RPR0521"
  71 #define RPR0521_IRQ_NAME                "rpr0521_event"
  72 #define RPR0521_REGMAP_NAME             "rpr0521_regmap"
  73 
  74 #define RPR0521_SLEEP_DELAY_MS  2000
  75 
  76 #define RPR0521_ALS_SCALE_AVAIL "0.007812 0.015625 0.5 1"
  77 #define RPR0521_PXS_SCALE_AVAIL "0.125 0.5 1"
  78 
  79 struct rpr0521_gain {
  80         int scale;
  81         int uscale;
  82 };
  83 
  84 static const struct rpr0521_gain rpr0521_als_gain[4] = {
  85         {1, 0},         /* x1 */
  86         {0, 500000},    /* x2 */
  87         {0, 15625},     /* x64 */
  88         {0, 7812},      /* x128 */
  89 };
  90 
  91 static const struct rpr0521_gain rpr0521_pxs_gain[3] = {
  92         {1, 0},         /* x1 */
  93         {0, 500000},    /* x2 */
  94         {0, 125000},    /* x4 */
  95 };
  96 
  97 enum rpr0521_channel {
  98         RPR0521_CHAN_PXS,
  99         RPR0521_CHAN_ALS_DATA0,
 100         RPR0521_CHAN_ALS_DATA1,
 101 };
 102 
 103 struct rpr0521_reg_desc {
 104         u8 address;
 105         u8 device_mask;
 106 };
 107 
 108 static const struct rpr0521_reg_desc rpr0521_data_reg[] = {
 109         [RPR0521_CHAN_PXS]      = {
 110                 .address        = RPR0521_REG_PXS_DATA,
 111                 .device_mask    = RPR0521_MODE_PXS_MASK,
 112         },
 113         [RPR0521_CHAN_ALS_DATA0] = {
 114                 .address        = RPR0521_REG_ALS_DATA0,
 115                 .device_mask    = RPR0521_MODE_ALS_MASK,
 116         },
 117         [RPR0521_CHAN_ALS_DATA1] = {
 118                 .address        = RPR0521_REG_ALS_DATA1,
 119                 .device_mask    = RPR0521_MODE_ALS_MASK,
 120         },
 121 };
 122 
 123 static const struct rpr0521_gain_info {
 124         u8 reg;
 125         u8 mask;
 126         u8 shift;
 127         const struct rpr0521_gain *gain;
 128         int size;
 129 } rpr0521_gain[] = {
 130         [RPR0521_CHAN_PXS] = {
 131                 .reg    = RPR0521_REG_PXS_CTRL,
 132                 .mask   = RPR0521_PXS_GAIN_MASK,
 133                 .shift  = RPR0521_PXS_GAIN_SHIFT,
 134                 .gain   = rpr0521_pxs_gain,
 135                 .size   = ARRAY_SIZE(rpr0521_pxs_gain),
 136         },
 137         [RPR0521_CHAN_ALS_DATA0] = {
 138                 .reg    = RPR0521_REG_ALS_CTRL,
 139                 .mask   = RPR0521_ALS_DATA0_GAIN_MASK,
 140                 .shift  = RPR0521_ALS_DATA0_GAIN_SHIFT,
 141                 .gain   = rpr0521_als_gain,
 142                 .size   = ARRAY_SIZE(rpr0521_als_gain),
 143         },
 144         [RPR0521_CHAN_ALS_DATA1] = {
 145                 .reg    = RPR0521_REG_ALS_CTRL,
 146                 .mask   = RPR0521_ALS_DATA1_GAIN_MASK,
 147                 .shift  = RPR0521_ALS_DATA1_GAIN_SHIFT,
 148                 .gain   = rpr0521_als_gain,
 149                 .size   = ARRAY_SIZE(rpr0521_als_gain),
 150         },
 151 };
 152 
 153 struct rpr0521_samp_freq {
 154         int     als_hz;
 155         int     als_uhz;
 156         int     pxs_hz;
 157         int     pxs_uhz;
 158 };
 159 
 160 static const struct rpr0521_samp_freq rpr0521_samp_freq_i[13] = {
 161 /*      {ALS, PXS},                W==currently writable option */
 162         {0, 0, 0, 0},           /* W0000, 0=standby */
 163         {0, 0, 100, 0},         /*  0001 */
 164         {0, 0, 25, 0},          /*  0010 */
 165         {0, 0, 10, 0},          /*  0011 */
 166         {0, 0, 2, 500000},      /*  0100 */
 167         {10, 0, 20, 0},         /*  0101 */
 168         {10, 0, 10, 0},         /* W0110 */
 169         {10, 0, 2, 500000},     /*  0111 */
 170         {2, 500000, 20, 0},     /*  1000, measurement 100ms, sleep 300ms */
 171         {2, 500000, 10, 0},     /*  1001, measurement 100ms, sleep 300ms */
 172         {2, 500000, 0, 0},      /*  1010, high sensitivity mode */
 173         {2, 500000, 2, 500000}, /* W1011, high sensitivity mode */
 174         {20, 0, 20, 0}  /* 1100, ALS_data x 0.5, see specification P.18 */
 175 };
 176 
 177 struct rpr0521_data {
 178         struct i2c_client *client;
 179 
 180         /* protect device params updates (e.g state, gain) */
 181         struct mutex lock;
 182 
 183         /* device active status */
 184         bool als_dev_en;
 185         bool pxs_dev_en;
 186 
 187         struct iio_trigger *drdy_trigger0;
 188         s64 irq_timestamp;
 189 
 190         /* optimize runtime pm ops - enable/disable device only if needed */
 191         bool als_ps_need_en;
 192         bool pxs_ps_need_en;
 193         bool als_need_dis;
 194         bool pxs_need_dis;
 195 
 196         struct regmap *regmap;
 197 };
 198 
 199 static IIO_CONST_ATTR(in_intensity_scale_available, RPR0521_ALS_SCALE_AVAIL);
 200 static IIO_CONST_ATTR(in_proximity_scale_available, RPR0521_PXS_SCALE_AVAIL);
 201 
 202 /*
 203  * Start with easy freq first, whole table of freq combinations is more
 204  * complicated.
 205  */
 206 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("2.5 10");
 207 
 208 static struct attribute *rpr0521_attributes[] = {
 209         &iio_const_attr_in_intensity_scale_available.dev_attr.attr,
 210         &iio_const_attr_in_proximity_scale_available.dev_attr.attr,
 211         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 212         NULL,
 213 };
 214 
 215 static const struct attribute_group rpr0521_attribute_group = {
 216         .attrs = rpr0521_attributes,
 217 };
 218 
 219 /* Order of the channel data in buffer */
 220 enum rpr0521_scan_index_order {
 221         RPR0521_CHAN_INDEX_PXS,
 222         RPR0521_CHAN_INDEX_BOTH,
 223         RPR0521_CHAN_INDEX_IR,
 224 };
 225 
 226 static const unsigned long rpr0521_available_scan_masks[] = {
 227         BIT(RPR0521_CHAN_INDEX_PXS) | BIT(RPR0521_CHAN_INDEX_BOTH) |
 228         BIT(RPR0521_CHAN_INDEX_IR),
 229         0
 230 };
 231 
 232 static const struct iio_chan_spec rpr0521_channels[] = {
 233         {
 234                 .type = IIO_PROXIMITY,
 235                 .address = RPR0521_CHAN_PXS,
 236                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 237                         BIT(IIO_CHAN_INFO_OFFSET) |
 238                         BIT(IIO_CHAN_INFO_SCALE),
 239                 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
 240                 .scan_index = RPR0521_CHAN_INDEX_PXS,
 241                 .scan_type = {
 242                         .sign = 'u',
 243                         .realbits = 16,
 244                         .storagebits = 16,
 245                         .endianness = IIO_LE,
 246                 },
 247         },
 248         {
 249                 .type = IIO_INTENSITY,
 250                 .modified = 1,
 251                 .address = RPR0521_CHAN_ALS_DATA0,
 252                 .channel2 = IIO_MOD_LIGHT_BOTH,
 253                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 254                         BIT(IIO_CHAN_INFO_SCALE),
 255                 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
 256                 .scan_index = RPR0521_CHAN_INDEX_BOTH,
 257                 .scan_type = {
 258                         .sign = 'u',
 259                         .realbits = 16,
 260                         .storagebits = 16,
 261                         .endianness = IIO_LE,
 262                 },
 263         },
 264         {
 265                 .type = IIO_INTENSITY,
 266                 .modified = 1,
 267                 .address = RPR0521_CHAN_ALS_DATA1,
 268                 .channel2 = IIO_MOD_LIGHT_IR,
 269                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 270                         BIT(IIO_CHAN_INFO_SCALE),
 271                 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
 272                 .scan_index = RPR0521_CHAN_INDEX_IR,
 273                 .scan_type = {
 274                         .sign = 'u',
 275                         .realbits = 16,
 276                         .storagebits = 16,
 277                         .endianness = IIO_LE,
 278                 },
 279         },
 280 };
 281 
 282 static int rpr0521_als_enable(struct rpr0521_data *data, u8 status)
 283 {
 284         int ret;
 285 
 286         ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
 287                                  RPR0521_MODE_ALS_MASK,
 288                                  status);
 289         if (ret < 0)
 290                 return ret;
 291 
 292         if (status & RPR0521_MODE_ALS_MASK)
 293                 data->als_dev_en = true;
 294         else
 295                 data->als_dev_en = false;
 296 
 297         return 0;
 298 }
 299 
 300 static int rpr0521_pxs_enable(struct rpr0521_data *data, u8 status)
 301 {
 302         int ret;
 303 
 304         ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
 305                                  RPR0521_MODE_PXS_MASK,
 306                                  status);
 307         if (ret < 0)
 308                 return ret;
 309 
 310         if (status & RPR0521_MODE_PXS_MASK)
 311                 data->pxs_dev_en = true;
 312         else
 313                 data->pxs_dev_en = false;
 314 
 315         return 0;
 316 }
 317 
 318 /**
 319  * rpr0521_set_power_state - handles runtime PM state and sensors enabled status
 320  *
 321  * @data: rpr0521 device private data
 322  * @on: state to be set for devices in @device_mask
 323  * @device_mask: bitmask specifying for which device we need to update @on state
 324  *
 325  * Calls for this function must be balanced so that each ON should have matching
 326  * OFF. Otherwise pm usage_count gets out of sync.
 327  */
 328 static int rpr0521_set_power_state(struct rpr0521_data *data, bool on,
 329                                    u8 device_mask)
 330 {
 331 #ifdef CONFIG_PM
 332         int ret;
 333 
 334         if (device_mask & RPR0521_MODE_ALS_MASK) {
 335                 data->als_ps_need_en = on;
 336                 data->als_need_dis = !on;
 337         }
 338 
 339         if (device_mask & RPR0521_MODE_PXS_MASK) {
 340                 data->pxs_ps_need_en = on;
 341                 data->pxs_need_dis = !on;
 342         }
 343 
 344         /*
 345          * On: _resume() is called only when we are suspended
 346          * Off: _suspend() is called after delay if _resume() is not
 347          * called before that.
 348          * Note: If either measurement is re-enabled before _suspend(),
 349          * both stay enabled until _suspend().
 350          */
 351         if (on) {
 352                 ret = pm_runtime_get_sync(&data->client->dev);
 353         } else {
 354                 pm_runtime_mark_last_busy(&data->client->dev);
 355                 ret = pm_runtime_put_autosuspend(&data->client->dev);
 356         }
 357         if (ret < 0) {
 358                 dev_err(&data->client->dev,
 359                         "Failed: rpr0521_set_power_state for %d, ret %d\n",
 360                         on, ret);
 361                 if (on)
 362                         pm_runtime_put_noidle(&data->client->dev);
 363 
 364                 return ret;
 365         }
 366 
 367         if (on) {
 368                 /* If _resume() was not called, enable measurement now. */
 369                 if (data->als_ps_need_en) {
 370                         ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE);
 371                         if (ret)
 372                                 return ret;
 373                         data->als_ps_need_en = false;
 374                 }
 375 
 376                 if (data->pxs_ps_need_en) {
 377                         ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE);
 378                         if (ret)
 379                                 return ret;
 380                         data->pxs_ps_need_en = false;
 381                 }
 382         }
 383 #endif
 384         return 0;
 385 }
 386 
 387 /* Interrupt register tells if this sensor caused the interrupt or not. */
 388 static inline bool rpr0521_is_triggered(struct rpr0521_data *data)
 389 {
 390         int ret;
 391         int reg;
 392 
 393         ret = regmap_read(data->regmap, RPR0521_REG_INTERRUPT, &reg);
 394         if (ret < 0)
 395                 return false;   /* Reg read failed. */
 396         if (reg &
 397             (RPR0521_INTERRUPT_ALS_INT_STATUS_MASK |
 398             RPR0521_INTERRUPT_PS_INT_STATUS_MASK))
 399                 return true;
 400         else
 401                 return false;   /* Int not from this sensor. */
 402 }
 403 
 404 /* IRQ to trigger handler */
 405 static irqreturn_t rpr0521_drdy_irq_handler(int irq, void *private)
 406 {
 407         struct iio_dev *indio_dev = private;
 408         struct rpr0521_data *data = iio_priv(indio_dev);
 409 
 410         data->irq_timestamp = iio_get_time_ns(indio_dev);
 411         /*
 412          * We need to wake the thread to read the interrupt reg. It
 413          * is not possible to do that here because regmap_read takes a
 414          * mutex.
 415          */
 416 
 417         return IRQ_WAKE_THREAD;
 418 }
 419 
 420 static irqreturn_t rpr0521_drdy_irq_thread(int irq, void *private)
 421 {
 422         struct iio_dev *indio_dev = private;
 423         struct rpr0521_data *data = iio_priv(indio_dev);
 424 
 425         if (rpr0521_is_triggered(data)) {
 426                 iio_trigger_poll_chained(data->drdy_trigger0);
 427                 return IRQ_HANDLED;
 428         }
 429 
 430         return IRQ_NONE;
 431 }
 432 
 433 static irqreturn_t rpr0521_trigger_consumer_store_time(int irq, void *p)
 434 {
 435         struct iio_poll_func *pf = p;
 436         struct iio_dev *indio_dev = pf->indio_dev;
 437 
 438         /* Other trigger polls store time here. */
 439         if (!iio_trigger_using_own(indio_dev))
 440                 pf->timestamp = iio_get_time_ns(indio_dev);
 441 
 442         return IRQ_WAKE_THREAD;
 443 }
 444 
 445 static irqreturn_t rpr0521_trigger_consumer_handler(int irq, void *p)
 446 {
 447         struct iio_poll_func *pf = p;
 448         struct iio_dev *indio_dev = pf->indio_dev;
 449         struct rpr0521_data *data = iio_priv(indio_dev);
 450         int err;
 451 
 452         u8 buffer[16]; /* 3 16-bit channels + padding + ts */
 453 
 454         /* Use irq timestamp when reasonable. */
 455         if (iio_trigger_using_own(indio_dev) && data->irq_timestamp) {
 456                 pf->timestamp = data->irq_timestamp;
 457                 data->irq_timestamp = 0;
 458         }
 459         /* Other chained trigger polls get timestamp only here. */
 460         if (!pf->timestamp)
 461                 pf->timestamp = iio_get_time_ns(indio_dev);
 462 
 463         err = regmap_bulk_read(data->regmap, RPR0521_REG_PXS_DATA,
 464                 &buffer,
 465                 (3 * 2) + 1);   /* 3 * 16-bit + (discarded) int clear reg. */
 466         if (!err)
 467                 iio_push_to_buffers_with_timestamp(indio_dev,
 468                                                    buffer, pf->timestamp);
 469         else
 470                 dev_err(&data->client->dev,
 471                         "Trigger consumer can't read from sensor.\n");
 472         pf->timestamp = 0;
 473 
 474         iio_trigger_notify_done(indio_dev->trig);
 475 
 476         return IRQ_HANDLED;
 477 }
 478 
 479 static int rpr0521_write_int_enable(struct rpr0521_data *data)
 480 {
 481         int err;
 482 
 483         /* Interrupt after each measurement */
 484         err = regmap_update_bits(data->regmap, RPR0521_REG_PXS_CTRL,
 485                 RPR0521_PXS_PERSISTENCE_MASK,
 486                 RPR0521_PXS_PERSISTENCE_DRDY);
 487         if (err) {
 488                 dev_err(&data->client->dev, "PS control reg write fail.\n");
 489                 return -EBUSY;
 490                 }
 491 
 492         /* Ignore latch and mode because of drdy */
 493         err = regmap_write(data->regmap, RPR0521_REG_INTERRUPT,
 494                 RPR0521_INTERRUPT_INT_REASSERT_DISABLE |
 495                 RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE |
 496                 RPR0521_INTERRUPT_INT_TRIG_PS_ENABLE
 497                 );
 498         if (err) {
 499                 dev_err(&data->client->dev, "Interrupt setup write fail.\n");
 500                 return -EBUSY;
 501                 }
 502 
 503         return 0;
 504 }
 505 
 506 static int rpr0521_write_int_disable(struct rpr0521_data *data)
 507 {
 508         /* Don't care of clearing mode, assert and latch. */
 509         return regmap_write(data->regmap, RPR0521_REG_INTERRUPT,
 510                                 RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE |
 511                                 RPR0521_INTERRUPT_INT_TRIG_PS_DISABLE
 512                                 );
 513 }
 514 
 515 /*
 516  * Trigger producer enable / disable. Note that there will be trigs only when
 517  * measurement data is ready to be read.
 518  */
 519 static int rpr0521_pxs_drdy_set_state(struct iio_trigger *trigger,
 520         bool enable_drdy)
 521 {
 522         struct iio_dev *indio_dev = iio_trigger_get_drvdata(trigger);
 523         struct rpr0521_data *data = iio_priv(indio_dev);
 524         int err;
 525 
 526         if (enable_drdy)
 527                 err = rpr0521_write_int_enable(data);
 528         else
 529                 err = rpr0521_write_int_disable(data);
 530         if (err)
 531                 dev_err(&data->client->dev, "rpr0521_pxs_drdy_set_state failed\n");
 532 
 533         return err;
 534 }
 535 
 536 static const struct iio_trigger_ops rpr0521_trigger_ops = {
 537         .set_trigger_state = rpr0521_pxs_drdy_set_state,
 538         };
 539 
 540 
 541 static int rpr0521_buffer_preenable(struct iio_dev *indio_dev)
 542 {
 543         int err;
 544         struct rpr0521_data *data = iio_priv(indio_dev);
 545 
 546         mutex_lock(&data->lock);
 547         err = rpr0521_set_power_state(data, true,
 548                 (RPR0521_MODE_PXS_MASK | RPR0521_MODE_ALS_MASK));
 549         mutex_unlock(&data->lock);
 550         if (err)
 551                 dev_err(&data->client->dev, "_buffer_preenable fail\n");
 552 
 553         return err;
 554 }
 555 
 556 static int rpr0521_buffer_postdisable(struct iio_dev *indio_dev)
 557 {
 558         int err;
 559         struct rpr0521_data *data = iio_priv(indio_dev);
 560 
 561         mutex_lock(&data->lock);
 562         err = rpr0521_set_power_state(data, false,
 563                 (RPR0521_MODE_PXS_MASK | RPR0521_MODE_ALS_MASK));
 564         mutex_unlock(&data->lock);
 565         if (err)
 566                 dev_err(&data->client->dev, "_buffer_postdisable fail\n");
 567 
 568         return err;
 569 }
 570 
 571 static const struct iio_buffer_setup_ops rpr0521_buffer_setup_ops = {
 572         .preenable = rpr0521_buffer_preenable,
 573         .postenable = iio_triggered_buffer_postenable,
 574         .predisable = iio_triggered_buffer_predisable,
 575         .postdisable = rpr0521_buffer_postdisable,
 576 };
 577 
 578 static int rpr0521_get_gain(struct rpr0521_data *data, int chan,
 579                             int *val, int *val2)
 580 {
 581         int ret, reg, idx;
 582 
 583         ret = regmap_read(data->regmap, rpr0521_gain[chan].reg, &reg);
 584         if (ret < 0)
 585                 return ret;
 586 
 587         idx = (rpr0521_gain[chan].mask & reg) >> rpr0521_gain[chan].shift;
 588         *val = rpr0521_gain[chan].gain[idx].scale;
 589         *val2 = rpr0521_gain[chan].gain[idx].uscale;
 590 
 591         return 0;
 592 }
 593 
 594 static int rpr0521_set_gain(struct rpr0521_data *data, int chan,
 595                             int val, int val2)
 596 {
 597         int i, idx = -EINVAL;
 598 
 599         /* get gain index */
 600         for (i = 0; i < rpr0521_gain[chan].size; i++)
 601                 if (val == rpr0521_gain[chan].gain[i].scale &&
 602                     val2 == rpr0521_gain[chan].gain[i].uscale) {
 603                         idx = i;
 604                         break;
 605                 }
 606 
 607         if (idx < 0)
 608                 return idx;
 609 
 610         return regmap_update_bits(data->regmap, rpr0521_gain[chan].reg,
 611                                   rpr0521_gain[chan].mask,
 612                                   idx << rpr0521_gain[chan].shift);
 613 }
 614 
 615 static int rpr0521_read_samp_freq(struct rpr0521_data *data,
 616                                 enum iio_chan_type chan_type,
 617                             int *val, int *val2)
 618 {
 619         int reg, ret;
 620 
 621         ret = regmap_read(data->regmap, RPR0521_REG_MODE_CTRL, &reg);
 622         if (ret < 0)
 623                 return ret;
 624 
 625         reg &= RPR0521_MODE_MEAS_TIME_MASK;
 626         if (reg >= ARRAY_SIZE(rpr0521_samp_freq_i))
 627                 return -EINVAL;
 628 
 629         switch (chan_type) {
 630         case IIO_INTENSITY:
 631                 *val = rpr0521_samp_freq_i[reg].als_hz;
 632                 *val2 = rpr0521_samp_freq_i[reg].als_uhz;
 633                 return 0;
 634 
 635         case IIO_PROXIMITY:
 636                 *val = rpr0521_samp_freq_i[reg].pxs_hz;
 637                 *val2 = rpr0521_samp_freq_i[reg].pxs_uhz;
 638                 return 0;
 639 
 640         default:
 641                 return -EINVAL;
 642         }
 643 }
 644 
 645 static int rpr0521_write_samp_freq_common(struct rpr0521_data *data,
 646                                 enum iio_chan_type chan_type,
 647                                 int val, int val2)
 648 {
 649         int i;
 650 
 651         /*
 652          * Ignore channel
 653          * both pxs and als are setup only to same freq because of simplicity
 654          */
 655         switch (val) {
 656         case 0:
 657                 i = 0;
 658                 break;
 659 
 660         case 2:
 661                 if (val2 != 500000)
 662                         return -EINVAL;
 663 
 664                 i = 11;
 665                 break;
 666 
 667         case 10:
 668                 i = 6;
 669                 break;
 670 
 671         default:
 672                 return -EINVAL;
 673         }
 674 
 675         return regmap_update_bits(data->regmap,
 676                 RPR0521_REG_MODE_CTRL,
 677                 RPR0521_MODE_MEAS_TIME_MASK,
 678                 i);
 679 }
 680 
 681 static int rpr0521_read_ps_offset(struct rpr0521_data *data, int *offset)
 682 {
 683         int ret;
 684         __le16 buffer;
 685 
 686         ret = regmap_bulk_read(data->regmap,
 687                 RPR0521_REG_PS_OFFSET_LSB, &buffer, sizeof(buffer));
 688 
 689         if (ret < 0) {
 690                 dev_err(&data->client->dev, "Failed to read PS OFFSET register\n");
 691                 return ret;
 692         }
 693         *offset = le16_to_cpu(buffer);
 694 
 695         return ret;
 696 }
 697 
 698 static int rpr0521_write_ps_offset(struct rpr0521_data *data, int offset)
 699 {
 700         int ret;
 701         __le16 buffer;
 702 
 703         buffer = cpu_to_le16(offset & 0x3ff);
 704         ret = regmap_raw_write(data->regmap,
 705                 RPR0521_REG_PS_OFFSET_LSB, &buffer, sizeof(buffer));
 706 
 707         if (ret < 0) {
 708                 dev_err(&data->client->dev, "Failed to write PS OFFSET register\n");
 709                 return ret;
 710         }
 711 
 712         return ret;
 713 }
 714 
 715 static int rpr0521_read_raw(struct iio_dev *indio_dev,
 716                             struct iio_chan_spec const *chan, int *val,
 717                             int *val2, long mask)
 718 {
 719         struct rpr0521_data *data = iio_priv(indio_dev);
 720         int ret;
 721         int busy;
 722         u8 device_mask;
 723         __le16 raw_data;
 724 
 725         switch (mask) {
 726         case IIO_CHAN_INFO_RAW:
 727                 if (chan->type != IIO_INTENSITY && chan->type != IIO_PROXIMITY)
 728                         return -EINVAL;
 729 
 730                 busy = iio_device_claim_direct_mode(indio_dev);
 731                 if (busy)
 732                         return -EBUSY;
 733 
 734                 device_mask = rpr0521_data_reg[chan->address].device_mask;
 735 
 736                 mutex_lock(&data->lock);
 737                 ret = rpr0521_set_power_state(data, true, device_mask);
 738                 if (ret < 0)
 739                         goto rpr0521_read_raw_out;
 740 
 741                 ret = regmap_bulk_read(data->regmap,
 742                                        rpr0521_data_reg[chan->address].address,
 743                                        &raw_data, sizeof(raw_data));
 744                 if (ret < 0) {
 745                         rpr0521_set_power_state(data, false, device_mask);
 746                         goto rpr0521_read_raw_out;
 747                 }
 748 
 749                 ret = rpr0521_set_power_state(data, false, device_mask);
 750 
 751 rpr0521_read_raw_out:
 752                 mutex_unlock(&data->lock);
 753                 iio_device_release_direct_mode(indio_dev);
 754                 if (ret < 0)
 755                         return ret;
 756 
 757                 *val = le16_to_cpu(raw_data);
 758 
 759                 return IIO_VAL_INT;
 760 
 761         case IIO_CHAN_INFO_SCALE:
 762                 mutex_lock(&data->lock);
 763                 ret = rpr0521_get_gain(data, chan->address, val, val2);
 764                 mutex_unlock(&data->lock);
 765                 if (ret < 0)
 766                         return ret;
 767 
 768                 return IIO_VAL_INT_PLUS_MICRO;
 769 
 770         case IIO_CHAN_INFO_SAMP_FREQ:
 771                 mutex_lock(&data->lock);
 772                 ret = rpr0521_read_samp_freq(data, chan->type, val, val2);
 773                 mutex_unlock(&data->lock);
 774                 if (ret < 0)
 775                         return ret;
 776 
 777                 return IIO_VAL_INT_PLUS_MICRO;
 778 
 779         case IIO_CHAN_INFO_OFFSET:
 780                 mutex_lock(&data->lock);
 781                 ret = rpr0521_read_ps_offset(data, val);
 782                 mutex_unlock(&data->lock);
 783                 if (ret < 0)
 784                         return ret;
 785 
 786                 return IIO_VAL_INT;
 787 
 788         default:
 789                 return -EINVAL;
 790         }
 791 }
 792 
 793 static int rpr0521_write_raw(struct iio_dev *indio_dev,
 794                              struct iio_chan_spec const *chan, int val,
 795                              int val2, long mask)
 796 {
 797         struct rpr0521_data *data = iio_priv(indio_dev);
 798         int ret;
 799 
 800         switch (mask) {
 801         case IIO_CHAN_INFO_SCALE:
 802                 mutex_lock(&data->lock);
 803                 ret = rpr0521_set_gain(data, chan->address, val, val2);
 804                 mutex_unlock(&data->lock);
 805 
 806                 return ret;
 807 
 808         case IIO_CHAN_INFO_SAMP_FREQ:
 809                 mutex_lock(&data->lock);
 810                 ret = rpr0521_write_samp_freq_common(data, chan->type,
 811                                                      val, val2);
 812                 mutex_unlock(&data->lock);
 813 
 814                 return ret;
 815 
 816         case IIO_CHAN_INFO_OFFSET:
 817                 mutex_lock(&data->lock);
 818                 ret = rpr0521_write_ps_offset(data, val);
 819                 mutex_unlock(&data->lock);
 820 
 821                 return ret;
 822 
 823         default:
 824                 return -EINVAL;
 825         }
 826 }
 827 
 828 static const struct iio_info rpr0521_info = {
 829         .read_raw       = rpr0521_read_raw,
 830         .write_raw      = rpr0521_write_raw,
 831         .attrs          = &rpr0521_attribute_group,
 832 };
 833 
 834 static int rpr0521_init(struct rpr0521_data *data)
 835 {
 836         int ret;
 837         int id;
 838 
 839         ret = regmap_read(data->regmap, RPR0521_REG_ID, &id);
 840         if (ret < 0) {
 841                 dev_err(&data->client->dev, "Failed to read REG_ID register\n");
 842                 return ret;
 843         }
 844 
 845         if (id != RPR0521_MANUFACT_ID) {
 846                 dev_err(&data->client->dev, "Wrong id, got %x, expected %x\n",
 847                         id, RPR0521_MANUFACT_ID);
 848                 return -ENODEV;
 849         }
 850 
 851         /* set default measurement time - 100 ms for both ALS and PS */
 852         ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
 853                                  RPR0521_MODE_MEAS_TIME_MASK,
 854                                  RPR0521_DEFAULT_MEAS_TIME);
 855         if (ret) {
 856                 pr_err("regmap_update_bits returned %d\n", ret);
 857                 return ret;
 858         }
 859 
 860 #ifndef CONFIG_PM
 861         ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE);
 862         if (ret < 0)
 863                 return ret;
 864         ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE);
 865         if (ret < 0)
 866                 return ret;
 867 #endif
 868 
 869         data->irq_timestamp = 0;
 870 
 871         return 0;
 872 }
 873 
 874 static int rpr0521_poweroff(struct rpr0521_data *data)
 875 {
 876         int ret;
 877         int tmp;
 878 
 879         ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
 880                                  RPR0521_MODE_ALS_MASK |
 881                                  RPR0521_MODE_PXS_MASK,
 882                                  RPR0521_MODE_ALS_DISABLE |
 883                                  RPR0521_MODE_PXS_DISABLE);
 884         if (ret < 0)
 885                 return ret;
 886 
 887         data->als_dev_en = false;
 888         data->pxs_dev_en = false;
 889 
 890         /*
 891          * Int pin keeps state after power off. Set pin to high impedance
 892          * mode to prevent power drain.
 893          */
 894         ret = regmap_read(data->regmap, RPR0521_REG_INTERRUPT, &tmp);
 895         if (ret) {
 896                 dev_err(&data->client->dev, "Failed to reset int pin.\n");
 897                 return ret;
 898         }
 899 
 900         return 0;
 901 }
 902 
 903 static bool rpr0521_is_volatile_reg(struct device *dev, unsigned int reg)
 904 {
 905         switch (reg) {
 906         case RPR0521_REG_MODE_CTRL:
 907         case RPR0521_REG_ALS_CTRL:
 908         case RPR0521_REG_PXS_CTRL:
 909                 return false;
 910         default:
 911                 return true;
 912         }
 913 }
 914 
 915 static const struct regmap_config rpr0521_regmap_config = {
 916         .name           = RPR0521_REGMAP_NAME,
 917 
 918         .reg_bits       = 8,
 919         .val_bits       = 8,
 920 
 921         .max_register   = RPR0521_REG_ID,
 922         .cache_type     = REGCACHE_RBTREE,
 923         .volatile_reg   = rpr0521_is_volatile_reg,
 924 };
 925 
 926 static int rpr0521_probe(struct i2c_client *client,
 927                          const struct i2c_device_id *id)
 928 {
 929         struct rpr0521_data *data;
 930         struct iio_dev *indio_dev;
 931         struct regmap *regmap;
 932         int ret;
 933 
 934         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 935         if (!indio_dev)
 936                 return -ENOMEM;
 937 
 938         regmap = devm_regmap_init_i2c(client, &rpr0521_regmap_config);
 939         if (IS_ERR(regmap)) {
 940                 dev_err(&client->dev, "regmap_init failed!\n");
 941                 return PTR_ERR(regmap);
 942         }
 943 
 944         data = iio_priv(indio_dev);
 945         i2c_set_clientdata(client, indio_dev);
 946         data->client = client;
 947         data->regmap = regmap;
 948 
 949         mutex_init(&data->lock);
 950 
 951         indio_dev->dev.parent = &client->dev;
 952         indio_dev->info = &rpr0521_info;
 953         indio_dev->name = RPR0521_DRV_NAME;
 954         indio_dev->channels = rpr0521_channels;
 955         indio_dev->num_channels = ARRAY_SIZE(rpr0521_channels);
 956         indio_dev->modes = INDIO_DIRECT_MODE;
 957 
 958         ret = rpr0521_init(data);
 959         if (ret < 0) {
 960                 dev_err(&client->dev, "rpr0521 chip init failed\n");
 961                 return ret;
 962         }
 963 
 964         ret = pm_runtime_set_active(&client->dev);
 965         if (ret < 0)
 966                 goto err_poweroff;
 967 
 968         pm_runtime_enable(&client->dev);
 969         pm_runtime_set_autosuspend_delay(&client->dev, RPR0521_SLEEP_DELAY_MS);
 970         pm_runtime_use_autosuspend(&client->dev);
 971 
 972         /*
 973          * If sensor write/read is needed in _probe after _use_autosuspend,
 974          * sensor needs to be _resumed first using rpr0521_set_power_state().
 975          */
 976 
 977         /* IRQ to trigger setup */
 978         if (client->irq) {
 979                 /* Trigger0 producer setup */
 980                 data->drdy_trigger0 = devm_iio_trigger_alloc(
 981                         indio_dev->dev.parent,
 982                         "%s-dev%d", indio_dev->name, indio_dev->id);
 983                 if (!data->drdy_trigger0) {
 984                         ret = -ENOMEM;
 985                         goto err_pm_disable;
 986                 }
 987                 data->drdy_trigger0->dev.parent = indio_dev->dev.parent;
 988                 data->drdy_trigger0->ops = &rpr0521_trigger_ops;
 989                 indio_dev->available_scan_masks = rpr0521_available_scan_masks;
 990                 iio_trigger_set_drvdata(data->drdy_trigger0, indio_dev);
 991 
 992                 /* Ties irq to trigger producer handler. */
 993                 ret = devm_request_threaded_irq(&client->dev, client->irq,
 994                         rpr0521_drdy_irq_handler, rpr0521_drdy_irq_thread,
 995                         IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 996                         RPR0521_IRQ_NAME, indio_dev);
 997                 if (ret < 0) {
 998                         dev_err(&client->dev, "request irq %d for trigger0 failed\n",
 999                                 client->irq);
1000                         goto err_pm_disable;
1001                         }
1002 
1003                 ret = devm_iio_trigger_register(indio_dev->dev.parent,
1004                                                 data->drdy_trigger0);
1005                 if (ret) {
1006                         dev_err(&client->dev, "iio trigger register failed\n");
1007                         goto err_pm_disable;
1008                 }
1009 
1010                 /*
1011                  * Now whole pipe from physical interrupt (irq defined by
1012                  * devicetree to device) to trigger0 output is set up.
1013                  */
1014 
1015                 /* Trigger consumer setup */
1016                 ret = devm_iio_triggered_buffer_setup(indio_dev->dev.parent,
1017                         indio_dev,
1018                         rpr0521_trigger_consumer_store_time,
1019                         rpr0521_trigger_consumer_handler,
1020                         &rpr0521_buffer_setup_ops);
1021                 if (ret < 0) {
1022                         dev_err(&client->dev, "iio triggered buffer setup failed\n");
1023                         goto err_pm_disable;
1024                 }
1025         }
1026 
1027         ret = iio_device_register(indio_dev);
1028         if (ret)
1029                 goto err_pm_disable;
1030 
1031         return 0;
1032 
1033 err_pm_disable:
1034         pm_runtime_disable(&client->dev);
1035         pm_runtime_set_suspended(&client->dev);
1036         pm_runtime_put_noidle(&client->dev);
1037 err_poweroff:
1038         rpr0521_poweroff(data);
1039 
1040         return ret;
1041 }
1042 
1043 static int rpr0521_remove(struct i2c_client *client)
1044 {
1045         struct iio_dev *indio_dev = i2c_get_clientdata(client);
1046 
1047         iio_device_unregister(indio_dev);
1048 
1049         pm_runtime_disable(&client->dev);
1050         pm_runtime_set_suspended(&client->dev);
1051         pm_runtime_put_noidle(&client->dev);
1052 
1053         rpr0521_poweroff(iio_priv(indio_dev));
1054 
1055         return 0;
1056 }
1057 
1058 #ifdef CONFIG_PM
1059 static int rpr0521_runtime_suspend(struct device *dev)
1060 {
1061         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1062         struct rpr0521_data *data = iio_priv(indio_dev);
1063         int ret;
1064 
1065         mutex_lock(&data->lock);
1066         /* If measurements are enabled, enable them on resume */
1067         if (!data->als_need_dis)
1068                 data->als_ps_need_en = data->als_dev_en;
1069         if (!data->pxs_need_dis)
1070                 data->pxs_ps_need_en = data->pxs_dev_en;
1071 
1072         /* disable channels and sets {als,pxs}_dev_en to false */
1073         ret = rpr0521_poweroff(data);
1074         regcache_mark_dirty(data->regmap);
1075         mutex_unlock(&data->lock);
1076 
1077         return ret;
1078 }
1079 
1080 static int rpr0521_runtime_resume(struct device *dev)
1081 {
1082         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1083         struct rpr0521_data *data = iio_priv(indio_dev);
1084         int ret;
1085 
1086         regcache_sync(data->regmap);
1087         if (data->als_ps_need_en) {
1088                 ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE);
1089                 if (ret < 0)
1090                         return ret;
1091                 data->als_ps_need_en = false;
1092         }
1093 
1094         if (data->pxs_ps_need_en) {
1095                 ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE);
1096                 if (ret < 0)
1097                         return ret;
1098                 data->pxs_ps_need_en = false;
1099         }
1100         msleep(100);    //wait for first measurement result
1101 
1102         return 0;
1103 }
1104 #endif
1105 
1106 static const struct dev_pm_ops rpr0521_pm_ops = {
1107         SET_RUNTIME_PM_OPS(rpr0521_runtime_suspend,
1108                            rpr0521_runtime_resume, NULL)
1109 };
1110 
1111 static const struct acpi_device_id rpr0521_acpi_match[] = {
1112         {"RPR0521", 0},
1113         { }
1114 };
1115 MODULE_DEVICE_TABLE(acpi, rpr0521_acpi_match);
1116 
1117 static const struct i2c_device_id rpr0521_id[] = {
1118         {"rpr0521", 0},
1119         { }
1120 };
1121 
1122 MODULE_DEVICE_TABLE(i2c, rpr0521_id);
1123 
1124 static struct i2c_driver rpr0521_driver = {
1125         .driver = {
1126                 .name   = RPR0521_DRV_NAME,
1127                 .pm     = &rpr0521_pm_ops,
1128                 .acpi_match_table = ACPI_PTR(rpr0521_acpi_match),
1129         },
1130         .probe          = rpr0521_probe,
1131         .remove         = rpr0521_remove,
1132         .id_table       = rpr0521_id,
1133 };
1134 
1135 module_i2c_driver(rpr0521_driver);
1136 
1137 MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>");
1138 MODULE_DESCRIPTION("RPR0521 ROHM Ambient Light and Proximity Sensor driver");
1139 MODULE_LICENSE("GPL v2");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/iio/light/rpr0521.c

DEFINITIONS
