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/mod_devicetable.h> 14 #include <linux/cleanup.h> 15 #include <linux/init.h> 16 #include <linux/i2c.h> 17 #include <linux/regmap.h> 18 #include <linux/delay.h> 19 20 #include <linux/iio/iio.h> 21 #include <linux/iio/buffer.h> 22 #include <linux/iio/trigger.h> 23 #include <linux/iio/trigger_consumer.h> 24 #include <linux/iio/triggered_buffer.h> 25 #include <linux/iio/sysfs.h> 26 #include <linux/pm_runtime.h> 27 28 #define RPR0521_REG_SYSTEM_CTRL 0x40 29 #define RPR0521_REG_MODE_CTRL 0x41 30 #define RPR0521_REG_ALS_CTRL 0x42 31 #define RPR0521_REG_PXS_CTRL 0x43 32 #define RPR0521_REG_PXS_DATA 0x44 /* 16-bit, little endian */ 33 #define RPR0521_REG_ALS_DATA0 0x46 /* 16-bit, little endian */ 34 #define RPR0521_REG_ALS_DATA1 0x48 /* 16-bit, little endian */ 35 #define RPR0521_REG_INTERRUPT 0x4A 36 #define RPR0521_REG_PS_OFFSET_LSB 0x53 37 #define RPR0521_REG_ID 0x92 38 39 #define RPR0521_MODE_ALS_MASK BIT(7) 40 #define RPR0521_MODE_PXS_MASK BIT(6) 41 #define RPR0521_MODE_MEAS_TIME_MASK GENMASK(3, 0) 42 #define RPR0521_ALS_DATA0_GAIN_MASK GENMASK(5, 4) 43 #define RPR0521_ALS_DATA0_GAIN_SHIFT 4 44 #define RPR0521_ALS_DATA1_GAIN_MASK GENMASK(3, 2) 45 #define RPR0521_ALS_DATA1_GAIN_SHIFT 2 46 #define RPR0521_PXS_GAIN_MASK GENMASK(5, 4) 47 #define RPR0521_PXS_GAIN_SHIFT 4 48 #define RPR0521_PXS_PERSISTENCE_MASK GENMASK(3, 0) 49 #define RPR0521_INTERRUPT_INT_TRIG_PS_MASK BIT(0) 50 #define RPR0521_INTERRUPT_INT_TRIG_ALS_MASK BIT(1) 51 #define RPR0521_INTERRUPT_INT_REASSERT_MASK BIT(3) 52 #define RPR0521_INTERRUPT_ALS_INT_STATUS_MASK BIT(6) 53 #define RPR0521_INTERRUPT_PS_INT_STATUS_MASK BIT(7) 54 55 #define RPR0521_MODE_ALS_ENABLE BIT(7) 56 #define RPR0521_MODE_ALS_DISABLE 0x00 57 #define RPR0521_MODE_PXS_ENABLE BIT(6) 58 #define RPR0521_MODE_PXS_DISABLE 0x00 59 #define RPR0521_PXS_PERSISTENCE_DRDY 0x00 60 61 #define RPR0521_INTERRUPT_INT_TRIG_PS_ENABLE BIT(0) 62 #define RPR0521_INTERRUPT_INT_TRIG_PS_DISABLE 0x00 63 #define RPR0521_INTERRUPT_INT_TRIG_ALS_ENABLE BIT(1) 64 #define RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE 0x00 65 #define RPR0521_INTERRUPT_INT_REASSERT_ENABLE BIT(3) 66 #define RPR0521_INTERRUPT_INT_REASSERT_DISABLE 0x00 67 68 #define RPR0521_MANUFACT_ID 0xE0 69 #define RPR0521_DEFAULT_MEAS_TIME 0x06 /* ALS - 100ms, PXS - 100ms */ 70 71 #define RPR0521_DRV_NAME "RPR0521" 72 73 #define RPR0521_SLEEP_DELAY_MS 2000 74 75 #define RPR0521_ALS_SCALE_AVAIL "0.007812 0.015625 0.5 1" 76 #define RPR0521_PXS_SCALE_AVAIL "0.125 0.5 1" 77 78 struct rpr0521_gain { 79 int scale; 80 int uscale; 81 }; 82 83 static const struct rpr0521_gain rpr0521_als_gain[4] = { 84 {1, 0}, /* x1 */ 85 {0, 500000}, /* x2 */ 86 {0, 15625}, /* x64 */ 87 {0, 7812}, /* x128 */ 88 }; 89 90 static const struct rpr0521_gain rpr0521_pxs_gain[3] = { 91 {1, 0}, /* x1 */ 92 {0, 500000}, /* x2 */ 93 {0, 125000}, /* x4 */ 94 }; 95 96 enum rpr0521_channel { 97 RPR0521_CHAN_PXS, 98 RPR0521_CHAN_ALS_DATA0, 99 RPR0521_CHAN_ALS_DATA1, 100 }; 101 102 struct rpr0521_reg_desc { 103 u8 address; 104 u8 device_mask; 105 }; 106 107 static const struct rpr0521_reg_desc rpr0521_data_reg[] = { 108 [RPR0521_CHAN_PXS] = { 109 .address = RPR0521_REG_PXS_DATA, 110 .device_mask = RPR0521_MODE_PXS_MASK, 111 }, 112 [RPR0521_CHAN_ALS_DATA0] = { 113 .address = RPR0521_REG_ALS_DATA0, 114 .device_mask = RPR0521_MODE_ALS_MASK, 115 }, 116 [RPR0521_CHAN_ALS_DATA1] = { 117 .address = RPR0521_REG_ALS_DATA1, 118 .device_mask = RPR0521_MODE_ALS_MASK, 119 }, 120 }; 121 122 static const struct rpr0521_gain_info { 123 u8 reg; 124 u8 mask; 125 u8 shift; 126 const struct rpr0521_gain *gain; 127 int size; 128 } rpr0521_gain[] = { 129 [RPR0521_CHAN_PXS] = { 130 .reg = RPR0521_REG_PXS_CTRL, 131 .mask = RPR0521_PXS_GAIN_MASK, 132 .shift = RPR0521_PXS_GAIN_SHIFT, 133 .gain = rpr0521_pxs_gain, 134 .size = ARRAY_SIZE(rpr0521_pxs_gain), 135 }, 136 [RPR0521_CHAN_ALS_DATA0] = { 137 .reg = RPR0521_REG_ALS_CTRL, 138 .mask = RPR0521_ALS_DATA0_GAIN_MASK, 139 .shift = RPR0521_ALS_DATA0_GAIN_SHIFT, 140 .gain = rpr0521_als_gain, 141 .size = ARRAY_SIZE(rpr0521_als_gain), 142 }, 143 [RPR0521_CHAN_ALS_DATA1] = { 144 .reg = RPR0521_REG_ALS_CTRL, 145 .mask = RPR0521_ALS_DATA1_GAIN_MASK, 146 .shift = RPR0521_ALS_DATA1_GAIN_SHIFT, 147 .gain = rpr0521_als_gain, 148 .size = ARRAY_SIZE(rpr0521_als_gain), 149 }, 150 }; 151 152 struct rpr0521_samp_freq { 153 int als_hz; 154 int als_uhz; 155 int pxs_hz; 156 int pxs_uhz; 157 }; 158 159 static const struct rpr0521_samp_freq rpr0521_samp_freq_i[13] = { 160 /* {ALS, PXS}, W==currently writable option */ 161 {0, 0, 0, 0}, /* W0000, 0=standby */ 162 {0, 0, 100, 0}, /* 0001 */ 163 {0, 0, 25, 0}, /* 0010 */ 164 {0, 0, 10, 0}, /* 0011 */ 165 {0, 0, 2, 500000}, /* 0100 */ 166 {10, 0, 20, 0}, /* 0101 */ 167 {10, 0, 10, 0}, /* W0110 */ 168 {10, 0, 2, 500000}, /* 0111 */ 169 {2, 500000, 20, 0}, /* 1000, measurement 100ms, sleep 300ms */ 170 {2, 500000, 10, 0}, /* 1001, measurement 100ms, sleep 300ms */ 171 {2, 500000, 0, 0}, /* 1010, high sensitivity mode */ 172 {2, 500000, 2, 500000}, /* W1011, high sensitivity mode */ 173 {20, 0, 20, 0} /* 1100, ALS_data x 0.5, see specification P.18 */ 174 }; 175 176 struct rpr0521_data { 177 struct i2c_client *client; 178 179 /* protect device params updates (e.g state, gain) */ 180 struct mutex lock; 181 182 /* device active status */ 183 bool als_dev_en; 184 bool pxs_dev_en; 185 186 struct iio_trigger *drdy_trigger0; 187 s64 irq_timestamp; 188 189 /* optimize runtime pm ops - enable/disable device only if needed */ 190 bool als_ps_need_en; 191 bool pxs_ps_need_en; 192 bool als_need_dis; 193 bool pxs_need_dis; 194 195 struct regmap *regmap; 196 197 /* 198 * Ensure correct naturally aligned timestamp. 199 * Note that the read will put garbage data into 200 * the padding but this should not be a problem 201 */ 202 struct { 203 __le16 channels[3]; 204 u8 garbage; 205 aligned_s64 ts; 206 } scan; 207 }; 208 209 static IIO_CONST_ATTR(in_intensity_scale_available, RPR0521_ALS_SCALE_AVAIL); 210 static IIO_CONST_ATTR(in_proximity_scale_available, RPR0521_PXS_SCALE_AVAIL); 211 212 /* 213 * Start with easy freq first, whole table of freq combinations is more 214 * complicated. 215 */ 216 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("2.5 10"); 217 218 static struct attribute *rpr0521_attributes[] = { 219 &iio_const_attr_in_intensity_scale_available.dev_attr.attr, 220 &iio_const_attr_in_proximity_scale_available.dev_attr.attr, 221 &iio_const_attr_sampling_frequency_available.dev_attr.attr, 222 NULL, 223 }; 224 225 static const struct attribute_group rpr0521_attribute_group = { 226 .attrs = rpr0521_attributes, 227 }; 228 229 /* Order of the channel data in buffer */ 230 enum rpr0521_scan_index_order { 231 RPR0521_CHAN_INDEX_PXS, 232 RPR0521_CHAN_INDEX_BOTH, 233 RPR0521_CHAN_INDEX_IR, 234 }; 235 236 static const unsigned long rpr0521_available_scan_masks[] = { 237 BIT(RPR0521_CHAN_INDEX_PXS) | BIT(RPR0521_CHAN_INDEX_BOTH) | 238 BIT(RPR0521_CHAN_INDEX_IR), 239 0 240 }; 241 242 static const struct iio_chan_spec rpr0521_channels[] = { 243 { 244 .type = IIO_PROXIMITY, 245 .address = RPR0521_CHAN_PXS, 246 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 247 BIT(IIO_CHAN_INFO_OFFSET) | 248 BIT(IIO_CHAN_INFO_SCALE), 249 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), 250 .scan_index = RPR0521_CHAN_INDEX_PXS, 251 .scan_type = { 252 .sign = 'u', 253 .realbits = 16, 254 .storagebits = 16, 255 .endianness = IIO_LE, 256 }, 257 }, 258 { 259 .type = IIO_INTENSITY, 260 .modified = 1, 261 .address = RPR0521_CHAN_ALS_DATA0, 262 .channel2 = IIO_MOD_LIGHT_BOTH, 263 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 264 BIT(IIO_CHAN_INFO_SCALE), 265 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), 266 .scan_index = RPR0521_CHAN_INDEX_BOTH, 267 .scan_type = { 268 .sign = 'u', 269 .realbits = 16, 270 .storagebits = 16, 271 .endianness = IIO_LE, 272 }, 273 }, 274 { 275 .type = IIO_INTENSITY, 276 .modified = 1, 277 .address = RPR0521_CHAN_ALS_DATA1, 278 .channel2 = IIO_MOD_LIGHT_IR, 279 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 280 BIT(IIO_CHAN_INFO_SCALE), 281 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), 282 .scan_index = RPR0521_CHAN_INDEX_IR, 283 .scan_type = { 284 .sign = 'u', 285 .realbits = 16, 286 .storagebits = 16, 287 .endianness = IIO_LE, 288 }, 289 }, 290 }; 291 292 static int rpr0521_als_enable(struct rpr0521_data *data, u8 status) 293 { 294 int ret; 295 296 ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL, 297 RPR0521_MODE_ALS_MASK, 298 status); 299 if (ret < 0) 300 return ret; 301 302 if (status & RPR0521_MODE_ALS_MASK) 303 data->als_dev_en = true; 304 else 305 data->als_dev_en = false; 306 307 return 0; 308 } 309 310 static int rpr0521_pxs_enable(struct rpr0521_data *data, u8 status) 311 { 312 int ret; 313 314 ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL, 315 RPR0521_MODE_PXS_MASK, 316 status); 317 if (ret < 0) 318 return ret; 319 320 if (status & RPR0521_MODE_PXS_MASK) 321 data->pxs_dev_en = true; 322 else 323 data->pxs_dev_en = false; 324 325 return 0; 326 } 327 328 /** 329 * rpr0521_set_power_state - handles runtime PM state and sensors enabled status 330 * 331 * @data: rpr0521 device private data 332 * @on: state to be set for devices in @device_mask 333 * @device_mask: bitmask specifying for which device we need to update @on state 334 * 335 * Calls for this function must be balanced so that each ON should have matching 336 * OFF. Otherwise pm usage_count gets out of sync. 337 */ 338 static int rpr0521_set_power_state(struct rpr0521_data *data, bool on, 339 u8 device_mask) 340 { 341 #ifdef CONFIG_PM 342 int ret; 343 344 if (device_mask & RPR0521_MODE_ALS_MASK) { 345 data->als_ps_need_en = on; 346 data->als_need_dis = !on; 347 } 348 349 if (device_mask & RPR0521_MODE_PXS_MASK) { 350 data->pxs_ps_need_en = on; 351 data->pxs_need_dis = !on; 352 } 353 354 /* 355 * On: _resume() is called only when we are suspended 356 * Off: _suspend() is called after delay if _resume() is not 357 * called before that. 358 * Note: If either measurement is re-enabled before _suspend(), 359 * both stay enabled until _suspend(). 360 */ 361 if (on) { 362 ret = pm_runtime_resume_and_get(&data->client->dev); 363 } else { 364 pm_runtime_mark_last_busy(&data->client->dev); 365 ret = pm_runtime_put_autosuspend(&data->client->dev); 366 } 367 if (ret < 0) { 368 dev_err(&data->client->dev, 369 "Failed: rpr0521_set_power_state for %d, ret %d\n", 370 on, ret); 371 return ret; 372 } 373 374 if (on) { 375 /* If _resume() was not called, enable measurement now. */ 376 if (data->als_ps_need_en) { 377 ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE); 378 if (ret) 379 return ret; 380 data->als_ps_need_en = false; 381 } 382 383 if (data->pxs_ps_need_en) { 384 ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE); 385 if (ret) 386 return ret; 387 data->pxs_ps_need_en = false; 388 } 389 } 390 #endif 391 return 0; 392 } 393 394 /* Interrupt register tells if this sensor caused the interrupt or not. */ 395 static inline bool rpr0521_is_triggered(struct rpr0521_data *data) 396 { 397 int ret; 398 int reg; 399 400 ret = regmap_read(data->regmap, RPR0521_REG_INTERRUPT, ®); 401 if (ret < 0) 402 return false; /* Reg read failed. */ 403 if (reg & 404 (RPR0521_INTERRUPT_ALS_INT_STATUS_MASK | 405 RPR0521_INTERRUPT_PS_INT_STATUS_MASK)) 406 return true; 407 else 408 return false; /* Int not from this sensor. */ 409 } 410 411 /* IRQ to trigger handler */ 412 static irqreturn_t rpr0521_drdy_irq_handler(int irq, void *private) 413 { 414 struct iio_dev *indio_dev = private; 415 struct rpr0521_data *data = iio_priv(indio_dev); 416 417 data->irq_timestamp = iio_get_time_ns(indio_dev); 418 /* 419 * We need to wake the thread to read the interrupt reg. It 420 * is not possible to do that here because regmap_read takes a 421 * mutex. 422 */ 423 424 return IRQ_WAKE_THREAD; 425 } 426 427 static irqreturn_t rpr0521_drdy_irq_thread(int irq, void *private) 428 { 429 struct iio_dev *indio_dev = private; 430 struct rpr0521_data *data = iio_priv(indio_dev); 431 432 if (rpr0521_is_triggered(data)) { 433 iio_trigger_poll_nested(data->drdy_trigger0); 434 return IRQ_HANDLED; 435 } 436 437 return IRQ_NONE; 438 } 439 440 static irqreturn_t rpr0521_trigger_consumer_handler(int irq, void *p) 441 { 442 struct iio_poll_func *pf = p; 443 struct iio_dev *indio_dev = pf->indio_dev; 444 struct rpr0521_data *data = iio_priv(indio_dev); 445 int err; 446 447 /* Use irq timestamp when reasonable. */ 448 if (iio_trigger_using_own(indio_dev) && data->irq_timestamp) { 449 pf->timestamp = data->irq_timestamp; 450 data->irq_timestamp = 0; 451 } 452 /* Other chained trigger polls get timestamp only here. */ 453 if (!pf->timestamp) 454 pf->timestamp = iio_get_time_ns(indio_dev); 455 456 err = regmap_bulk_read(data->regmap, RPR0521_REG_PXS_DATA, 457 data->scan.channels, 458 (3 * 2) + 1); /* 3 * 16-bit + (discarded) int clear reg. */ 459 if (!err) 460 iio_push_to_buffers_with_timestamp(indio_dev, 461 &data->scan, pf->timestamp); 462 else 463 dev_err(&data->client->dev, 464 "Trigger consumer can't read from sensor.\n"); 465 pf->timestamp = 0; 466 467 iio_trigger_notify_done(indio_dev->trig); 468 469 return IRQ_HANDLED; 470 } 471 472 static int rpr0521_write_int_enable(struct rpr0521_data *data) 473 { 474 int err; 475 476 /* Interrupt after each measurement */ 477 err = regmap_update_bits(data->regmap, RPR0521_REG_PXS_CTRL, 478 RPR0521_PXS_PERSISTENCE_MASK, 479 RPR0521_PXS_PERSISTENCE_DRDY); 480 if (err) { 481 dev_err(&data->client->dev, "PS control reg write fail.\n"); 482 return -EBUSY; 483 } 484 485 /* Ignore latch and mode because of drdy */ 486 err = regmap_write(data->regmap, RPR0521_REG_INTERRUPT, 487 RPR0521_INTERRUPT_INT_REASSERT_DISABLE | 488 RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE | 489 RPR0521_INTERRUPT_INT_TRIG_PS_ENABLE 490 ); 491 if (err) { 492 dev_err(&data->client->dev, "Interrupt setup write fail.\n"); 493 return -EBUSY; 494 } 495 496 return 0; 497 } 498 499 static int rpr0521_write_int_disable(struct rpr0521_data *data) 500 { 501 /* Don't care of clearing mode, assert and latch. */ 502 return regmap_write(data->regmap, RPR0521_REG_INTERRUPT, 503 RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE | 504 RPR0521_INTERRUPT_INT_TRIG_PS_DISABLE 505 ); 506 } 507 508 /* 509 * Trigger producer enable / disable. Note that there will be trigs only when 510 * measurement data is ready to be read. 511 */ 512 static int rpr0521_pxs_drdy_set_state(struct iio_trigger *trigger, 513 bool enable_drdy) 514 { 515 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trigger); 516 struct rpr0521_data *data = iio_priv(indio_dev); 517 int err; 518 519 if (enable_drdy) 520 err = rpr0521_write_int_enable(data); 521 else 522 err = rpr0521_write_int_disable(data); 523 if (err) 524 dev_err(&data->client->dev, "rpr0521_pxs_drdy_set_state failed\n"); 525 526 return err; 527 } 528 529 static const struct iio_trigger_ops rpr0521_trigger_ops = { 530 .set_trigger_state = rpr0521_pxs_drdy_set_state, 531 }; 532 533 534 static int rpr0521_buffer_preenable(struct iio_dev *indio_dev) 535 { 536 int err; 537 struct rpr0521_data *data = iio_priv(indio_dev); 538 539 mutex_lock(&data->lock); 540 err = rpr0521_set_power_state(data, true, 541 (RPR0521_MODE_PXS_MASK | RPR0521_MODE_ALS_MASK)); 542 mutex_unlock(&data->lock); 543 if (err) 544 dev_err(&data->client->dev, "_buffer_preenable fail\n"); 545 546 return err; 547 } 548 549 static int rpr0521_buffer_postdisable(struct iio_dev *indio_dev) 550 { 551 int err; 552 struct rpr0521_data *data = iio_priv(indio_dev); 553 554 mutex_lock(&data->lock); 555 err = rpr0521_set_power_state(data, false, 556 (RPR0521_MODE_PXS_MASK | RPR0521_MODE_ALS_MASK)); 557 mutex_unlock(&data->lock); 558 if (err) 559 dev_err(&data->client->dev, "_buffer_postdisable fail\n"); 560 561 return err; 562 } 563 564 static const struct iio_buffer_setup_ops rpr0521_buffer_setup_ops = { 565 .preenable = rpr0521_buffer_preenable, 566 .postdisable = rpr0521_buffer_postdisable, 567 }; 568 569 static int rpr0521_get_gain(struct rpr0521_data *data, int chan, 570 int *val, int *val2) 571 { 572 int ret, reg, idx; 573 574 ret = regmap_read(data->regmap, rpr0521_gain[chan].reg, ®); 575 if (ret < 0) 576 return ret; 577 578 idx = (rpr0521_gain[chan].mask & reg) >> rpr0521_gain[chan].shift; 579 *val = rpr0521_gain[chan].gain[idx].scale; 580 *val2 = rpr0521_gain[chan].gain[idx].uscale; 581 582 return 0; 583 } 584 585 static int rpr0521_set_gain(struct rpr0521_data *data, int chan, 586 int val, int val2) 587 { 588 int i, idx = -EINVAL; 589 590 /* get gain index */ 591 for (i = 0; i < rpr0521_gain[chan].size; i++) 592 if (val == rpr0521_gain[chan].gain[i].scale && 593 val2 == rpr0521_gain[chan].gain[i].uscale) { 594 idx = i; 595 break; 596 } 597 598 if (idx < 0) 599 return idx; 600 601 return regmap_update_bits(data->regmap, rpr0521_gain[chan].reg, 602 rpr0521_gain[chan].mask, 603 idx << rpr0521_gain[chan].shift); 604 } 605 606 static int rpr0521_read_samp_freq(struct rpr0521_data *data, 607 enum iio_chan_type chan_type, 608 int *val, int *val2) 609 { 610 int reg, ret; 611 612 ret = regmap_read(data->regmap, RPR0521_REG_MODE_CTRL, ®); 613 if (ret < 0) 614 return ret; 615 616 reg &= RPR0521_MODE_MEAS_TIME_MASK; 617 if (reg >= ARRAY_SIZE(rpr0521_samp_freq_i)) 618 return -EINVAL; 619 620 switch (chan_type) { 621 case IIO_INTENSITY: 622 *val = rpr0521_samp_freq_i[reg].als_hz; 623 *val2 = rpr0521_samp_freq_i[reg].als_uhz; 624 return 0; 625 626 case IIO_PROXIMITY: 627 *val = rpr0521_samp_freq_i[reg].pxs_hz; 628 *val2 = rpr0521_samp_freq_i[reg].pxs_uhz; 629 return 0; 630 631 default: 632 return -EINVAL; 633 } 634 } 635 636 static int rpr0521_write_samp_freq_common(struct rpr0521_data *data, 637 enum iio_chan_type chan_type, 638 int val, int val2) 639 { 640 int i; 641 642 /* 643 * Ignore channel 644 * both pxs and als are setup only to same freq because of simplicity 645 */ 646 switch (val) { 647 case 0: 648 i = 0; 649 break; 650 651 case 2: 652 if (val2 != 500000) 653 return -EINVAL; 654 655 i = 11; 656 break; 657 658 case 10: 659 i = 6; 660 break; 661 662 default: 663 return -EINVAL; 664 } 665 666 return regmap_update_bits(data->regmap, 667 RPR0521_REG_MODE_CTRL, 668 RPR0521_MODE_MEAS_TIME_MASK, 669 i); 670 } 671 672 static int rpr0521_read_ps_offset(struct rpr0521_data *data, int *offset) 673 { 674 int ret; 675 __le16 buffer; 676 677 ret = regmap_bulk_read(data->regmap, 678 RPR0521_REG_PS_OFFSET_LSB, &buffer, sizeof(buffer)); 679 680 if (ret < 0) { 681 dev_err(&data->client->dev, "Failed to read PS OFFSET register\n"); 682 return ret; 683 } 684 *offset = le16_to_cpu(buffer); 685 686 return ret; 687 } 688 689 static int rpr0521_write_ps_offset(struct rpr0521_data *data, int offset) 690 { 691 int ret; 692 __le16 buffer; 693 694 buffer = cpu_to_le16(offset & 0x3ff); 695 ret = regmap_raw_write(data->regmap, 696 RPR0521_REG_PS_OFFSET_LSB, &buffer, sizeof(buffer)); 697 698 if (ret < 0) { 699 dev_err(&data->client->dev, "Failed to write PS OFFSET register\n"); 700 return ret; 701 } 702 703 return ret; 704 } 705 706 static int rpr0521_read_info_raw(struct rpr0521_data *data, 707 struct iio_chan_spec const *chan, 708 int *val) 709 { 710 u8 device_mask; 711 __le16 raw_data; 712 int ret; 713 714 device_mask = rpr0521_data_reg[chan->address].device_mask; 715 716 guard(mutex)(&data->lock); 717 ret = rpr0521_set_power_state(data, true, device_mask); 718 if (ret < 0) 719 return ret; 720 721 ret = regmap_bulk_read(data->regmap, 722 rpr0521_data_reg[chan->address].address, 723 &raw_data, sizeof(raw_data)); 724 if (ret < 0) { 725 rpr0521_set_power_state(data, false, device_mask); 726 return ret; 727 } 728 729 ret = rpr0521_set_power_state(data, false, device_mask); 730 if (ret < 0) 731 return ret; 732 733 *val = le16_to_cpu(raw_data); 734 735 return 0; 736 } 737 738 static int rpr0521_read_raw(struct iio_dev *indio_dev, 739 struct iio_chan_spec const *chan, int *val, 740 int *val2, long mask) 741 { 742 struct rpr0521_data *data = iio_priv(indio_dev); 743 int ret; 744 745 switch (mask) { 746 case IIO_CHAN_INFO_RAW: 747 if (chan->type != IIO_INTENSITY && chan->type != IIO_PROXIMITY) 748 return -EINVAL; 749 750 if (!iio_device_claim_direct(indio_dev)) 751 return -EBUSY; 752 753 ret = rpr0521_read_info_raw(data, chan, val); 754 iio_device_release_direct(indio_dev); 755 if (ret < 0) 756 return ret; 757 758 return IIO_VAL_INT; 759 760 case IIO_CHAN_INFO_SCALE: 761 mutex_lock(&data->lock); 762 ret = rpr0521_get_gain(data, chan->address, val, val2); 763 mutex_unlock(&data->lock); 764 if (ret < 0) 765 return ret; 766 767 return IIO_VAL_INT_PLUS_MICRO; 768 769 case IIO_CHAN_INFO_SAMP_FREQ: 770 mutex_lock(&data->lock); 771 ret = rpr0521_read_samp_freq(data, chan->type, val, val2); 772 mutex_unlock(&data->lock); 773 if (ret < 0) 774 return ret; 775 776 return IIO_VAL_INT_PLUS_MICRO; 777 778 case IIO_CHAN_INFO_OFFSET: 779 mutex_lock(&data->lock); 780 ret = rpr0521_read_ps_offset(data, val); 781 mutex_unlock(&data->lock); 782 if (ret < 0) 783 return ret; 784 785 return IIO_VAL_INT; 786 787 default: 788 return -EINVAL; 789 } 790 } 791 792 static int rpr0521_write_raw(struct iio_dev *indio_dev, 793 struct iio_chan_spec const *chan, int val, 794 int val2, long mask) 795 { 796 struct rpr0521_data *data = iio_priv(indio_dev); 797 int ret; 798 799 switch (mask) { 800 case IIO_CHAN_INFO_SCALE: 801 mutex_lock(&data->lock); 802 ret = rpr0521_set_gain(data, chan->address, val, val2); 803 mutex_unlock(&data->lock); 804 805 return ret; 806 807 case IIO_CHAN_INFO_SAMP_FREQ: 808 mutex_lock(&data->lock); 809 ret = rpr0521_write_samp_freq_common(data, chan->type, 810 val, val2); 811 mutex_unlock(&data->lock); 812 813 return ret; 814 815 case IIO_CHAN_INFO_OFFSET: 816 mutex_lock(&data->lock); 817 ret = rpr0521_write_ps_offset(data, val); 818 mutex_unlock(&data->lock); 819 820 return ret; 821 822 default: 823 return -EINVAL; 824 } 825 } 826 827 static const struct iio_info rpr0521_info = { 828 .read_raw = rpr0521_read_raw, 829 .write_raw = rpr0521_write_raw, 830 .attrs = &rpr0521_attribute_group, 831 }; 832 833 static int rpr0521_init(struct rpr0521_data *data) 834 { 835 int ret; 836 int id; 837 838 ret = regmap_read(data->regmap, RPR0521_REG_ID, &id); 839 if (ret < 0) { 840 dev_err(&data->client->dev, "Failed to read REG_ID register\n"); 841 return ret; 842 } 843 844 if (id != RPR0521_MANUFACT_ID) { 845 dev_err(&data->client->dev, "Wrong id, got %x, expected %x\n", 846 id, RPR0521_MANUFACT_ID); 847 return -ENODEV; 848 } 849 850 /* set default measurement time - 100 ms for both ALS and PS */ 851 ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL, 852 RPR0521_MODE_MEAS_TIME_MASK, 853 RPR0521_DEFAULT_MEAS_TIME); 854 if (ret) { 855 pr_err("regmap_update_bits returned %d\n", ret); 856 return ret; 857 } 858 859 #ifndef CONFIG_PM 860 ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE); 861 if (ret < 0) 862 return ret; 863 ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE); 864 if (ret < 0) 865 return ret; 866 #endif 867 868 data->irq_timestamp = 0; 869 870 return 0; 871 } 872 873 static int rpr0521_poweroff(struct rpr0521_data *data) 874 { 875 int ret; 876 int tmp; 877 878 ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL, 879 RPR0521_MODE_ALS_MASK | 880 RPR0521_MODE_PXS_MASK, 881 RPR0521_MODE_ALS_DISABLE | 882 RPR0521_MODE_PXS_DISABLE); 883 if (ret < 0) 884 return ret; 885 886 data->als_dev_en = false; 887 data->pxs_dev_en = false; 888 889 /* 890 * Int pin keeps state after power off. Set pin to high impedance 891 * mode to prevent power drain. 892 */ 893 ret = regmap_read(data->regmap, RPR0521_REG_INTERRUPT, &tmp); 894 if (ret) { 895 dev_err(&data->client->dev, "Failed to reset int pin.\n"); 896 return ret; 897 } 898 899 return 0; 900 } 901 902 static bool rpr0521_is_volatile_reg(struct device *dev, unsigned int reg) 903 { 904 switch (reg) { 905 case RPR0521_REG_MODE_CTRL: 906 case RPR0521_REG_ALS_CTRL: 907 case RPR0521_REG_PXS_CTRL: 908 return false; 909 default: 910 return true; 911 } 912 } 913 914 static const struct regmap_config rpr0521_regmap_config = { 915 .name = "rpr0521_regmap", 916 917 .reg_bits = 8, 918 .val_bits = 8, 919 920 .max_register = RPR0521_REG_ID, 921 .cache_type = REGCACHE_RBTREE, 922 .volatile_reg = rpr0521_is_volatile_reg, 923 }; 924 925 static int rpr0521_probe(struct i2c_client *client) 926 { 927 struct rpr0521_data *data; 928 struct iio_dev *indio_dev; 929 struct regmap *regmap; 930 int ret; 931 932 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); 933 if (!indio_dev) 934 return -ENOMEM; 935 936 regmap = devm_regmap_init_i2c(client, &rpr0521_regmap_config); 937 if (IS_ERR(regmap)) { 938 dev_err(&client->dev, "regmap_init failed!\n"); 939 return PTR_ERR(regmap); 940 } 941 942 data = iio_priv(indio_dev); 943 i2c_set_clientdata(client, indio_dev); 944 data->client = client; 945 data->regmap = regmap; 946 947 mutex_init(&data->lock); 948 949 indio_dev->info = &rpr0521_info; 950 indio_dev->name = RPR0521_DRV_NAME; 951 indio_dev->channels = rpr0521_channels; 952 indio_dev->num_channels = ARRAY_SIZE(rpr0521_channels); 953 indio_dev->modes = INDIO_DIRECT_MODE; 954 955 ret = rpr0521_init(data); 956 if (ret < 0) { 957 dev_err(&client->dev, "rpr0521 chip init failed\n"); 958 return ret; 959 } 960 961 ret = pm_runtime_set_active(&client->dev); 962 if (ret < 0) 963 goto err_poweroff; 964 965 pm_runtime_enable(&client->dev); 966 pm_runtime_set_autosuspend_delay(&client->dev, RPR0521_SLEEP_DELAY_MS); 967 pm_runtime_use_autosuspend(&client->dev); 968 969 /* 970 * If sensor write/read is needed in _probe after _use_autosuspend, 971 * sensor needs to be _resumed first using rpr0521_set_power_state(). 972 */ 973 974 /* IRQ to trigger setup */ 975 if (client->irq) { 976 /* Trigger0 producer setup */ 977 data->drdy_trigger0 = devm_iio_trigger_alloc( 978 indio_dev->dev.parent, 979 "%s-dev%d", indio_dev->name, iio_device_id(indio_dev)); 980 if (!data->drdy_trigger0) { 981 ret = -ENOMEM; 982 goto err_pm_disable; 983 } 984 data->drdy_trigger0->ops = &rpr0521_trigger_ops; 985 indio_dev->available_scan_masks = rpr0521_available_scan_masks; 986 iio_trigger_set_drvdata(data->drdy_trigger0, indio_dev); 987 988 /* Ties irq to trigger producer handler. */ 989 ret = devm_request_threaded_irq(&client->dev, client->irq, 990 rpr0521_drdy_irq_handler, rpr0521_drdy_irq_thread, 991 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 992 "rpr0521_event", indio_dev); 993 if (ret < 0) { 994 dev_err(&client->dev, "request irq %d for trigger0 failed\n", 995 client->irq); 996 goto err_pm_disable; 997 } 998 999 ret = devm_iio_trigger_register(indio_dev->dev.parent, 1000 data->drdy_trigger0); 1001 if (ret) { 1002 dev_err(&client->dev, "iio trigger register failed\n"); 1003 goto err_pm_disable; 1004 } 1005 1006 /* 1007 * Now whole pipe from physical interrupt (irq defined by 1008 * devicetree to device) to trigger0 output is set up. 1009 */ 1010 1011 /* Trigger consumer setup */ 1012 ret = devm_iio_triggered_buffer_setup(indio_dev->dev.parent, 1013 indio_dev, 1014 iio_pollfunc_store_time, 1015 rpr0521_trigger_consumer_handler, 1016 &rpr0521_buffer_setup_ops); 1017 if (ret < 0) { 1018 dev_err(&client->dev, "iio triggered buffer setup failed\n"); 1019 goto err_pm_disable; 1020 } 1021 } 1022 1023 ret = iio_device_register(indio_dev); 1024 if (ret) 1025 goto err_pm_disable; 1026 1027 return 0; 1028 1029 err_pm_disable: 1030 pm_runtime_disable(&client->dev); 1031 pm_runtime_set_suspended(&client->dev); 1032 err_poweroff: 1033 rpr0521_poweroff(data); 1034 1035 return ret; 1036 } 1037 1038 static void rpr0521_remove(struct i2c_client *client) 1039 { 1040 struct iio_dev *indio_dev = i2c_get_clientdata(client); 1041 1042 iio_device_unregister(indio_dev); 1043 1044 pm_runtime_disable(&client->dev); 1045 pm_runtime_set_suspended(&client->dev); 1046 1047 rpr0521_poweroff(iio_priv(indio_dev)); 1048 } 1049 1050 static int rpr0521_runtime_suspend(struct device *dev) 1051 { 1052 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 1053 struct rpr0521_data *data = iio_priv(indio_dev); 1054 int ret; 1055 1056 mutex_lock(&data->lock); 1057 /* If measurements are enabled, enable them on resume */ 1058 if (!data->als_need_dis) 1059 data->als_ps_need_en = data->als_dev_en; 1060 if (!data->pxs_need_dis) 1061 data->pxs_ps_need_en = data->pxs_dev_en; 1062 1063 /* disable channels and sets {als,pxs}_dev_en to false */ 1064 ret = rpr0521_poweroff(data); 1065 regcache_mark_dirty(data->regmap); 1066 mutex_unlock(&data->lock); 1067 1068 return ret; 1069 } 1070 1071 static int rpr0521_runtime_resume(struct device *dev) 1072 { 1073 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 1074 struct rpr0521_data *data = iio_priv(indio_dev); 1075 int ret; 1076 1077 regcache_sync(data->regmap); 1078 if (data->als_ps_need_en) { 1079 ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE); 1080 if (ret < 0) 1081 return ret; 1082 data->als_ps_need_en = false; 1083 } 1084 1085 if (data->pxs_ps_need_en) { 1086 ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE); 1087 if (ret < 0) 1088 return ret; 1089 data->pxs_ps_need_en = false; 1090 } 1091 msleep(100); //wait for first measurement result 1092 1093 return 0; 1094 } 1095 1096 static const struct dev_pm_ops rpr0521_pm_ops = { 1097 RUNTIME_PM_OPS(rpr0521_runtime_suspend, rpr0521_runtime_resume, NULL) 1098 }; 1099 1100 static const struct acpi_device_id rpr0521_acpi_match[] = { 1101 {"RPR0521", 0}, 1102 { } 1103 }; 1104 MODULE_DEVICE_TABLE(acpi, rpr0521_acpi_match); 1105 1106 static const struct i2c_device_id rpr0521_id[] = { 1107 { "rpr0521" }, 1108 { } 1109 }; 1110 1111 MODULE_DEVICE_TABLE(i2c, rpr0521_id); 1112 1113 static struct i2c_driver rpr0521_driver = { 1114 .driver = { 1115 .name = RPR0521_DRV_NAME, 1116 .pm = pm_ptr(&rpr0521_pm_ops), 1117 .acpi_match_table = rpr0521_acpi_match, 1118 }, 1119 .probe = rpr0521_probe, 1120 .remove = rpr0521_remove, 1121 .id_table = rpr0521_id, 1122 }; 1123 1124 module_i2c_driver(rpr0521_driver); 1125 1126 MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>"); 1127 MODULE_DESCRIPTION("RPR0521 ROHM Ambient Light and Proximity Sensor driver"); 1128 MODULE_LICENSE("GPL v2"); 1129