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, ®); 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, ®); 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, ®); 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"); 1140