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