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/init.h> 15 #include <linux/i2c.h> 16 #include <linux/regmap.h> 17 #include <linux/delay.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_nested(data->drdy_trigger0); 435 return IRQ_HANDLED; 436 } 437 438 return IRQ_NONE; 439 } 440 441 static irqreturn_t rpr0521_trigger_consumer_handler(int irq, void *p) 442 { 443 struct iio_poll_func *pf = p; 444 struct iio_dev *indio_dev = pf->indio_dev; 445 struct rpr0521_data *data = iio_priv(indio_dev); 446 int err; 447 448 /* Use irq timestamp when reasonable. */ 449 if (iio_trigger_using_own(indio_dev) && data->irq_timestamp) { 450 pf->timestamp = data->irq_timestamp; 451 data->irq_timestamp = 0; 452 } 453 /* Other chained trigger polls get timestamp only here. */ 454 if (!pf->timestamp) 455 pf->timestamp = iio_get_time_ns(indio_dev); 456 457 err = regmap_bulk_read(data->regmap, RPR0521_REG_PXS_DATA, 458 data->scan.channels, 459 (3 * 2) + 1); /* 3 * 16-bit + (discarded) int clear reg. */ 460 if (!err) 461 iio_push_to_buffers_with_timestamp(indio_dev, 462 &data->scan, pf->timestamp); 463 else 464 dev_err(&data->client->dev, 465 "Trigger consumer can't read from sensor.\n"); 466 pf->timestamp = 0; 467 468 iio_trigger_notify_done(indio_dev->trig); 469 470 return IRQ_HANDLED; 471 } 472 473 static int rpr0521_write_int_enable(struct rpr0521_data *data) 474 { 475 int err; 476 477 /* Interrupt after each measurement */ 478 err = regmap_update_bits(data->regmap, RPR0521_REG_PXS_CTRL, 479 RPR0521_PXS_PERSISTENCE_MASK, 480 RPR0521_PXS_PERSISTENCE_DRDY); 481 if (err) { 482 dev_err(&data->client->dev, "PS control reg write fail.\n"); 483 return -EBUSY; 484 } 485 486 /* Ignore latch and mode because of drdy */ 487 err = regmap_write(data->regmap, RPR0521_REG_INTERRUPT, 488 RPR0521_INTERRUPT_INT_REASSERT_DISABLE | 489 RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE | 490 RPR0521_INTERRUPT_INT_TRIG_PS_ENABLE 491 ); 492 if (err) { 493 dev_err(&data->client->dev, "Interrupt setup write fail.\n"); 494 return -EBUSY; 495 } 496 497 return 0; 498 } 499 500 static int rpr0521_write_int_disable(struct rpr0521_data *data) 501 { 502 /* Don't care of clearing mode, assert and latch. */ 503 return regmap_write(data->regmap, RPR0521_REG_INTERRUPT, 504 RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE | 505 RPR0521_INTERRUPT_INT_TRIG_PS_DISABLE 506 ); 507 } 508 509 /* 510 * Trigger producer enable / disable. Note that there will be trigs only when 511 * measurement data is ready to be read. 512 */ 513 static int rpr0521_pxs_drdy_set_state(struct iio_trigger *trigger, 514 bool enable_drdy) 515 { 516 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trigger); 517 struct rpr0521_data *data = iio_priv(indio_dev); 518 int err; 519 520 if (enable_drdy) 521 err = rpr0521_write_int_enable(data); 522 else 523 err = rpr0521_write_int_disable(data); 524 if (err) 525 dev_err(&data->client->dev, "rpr0521_pxs_drdy_set_state failed\n"); 526 527 return err; 528 } 529 530 static const struct iio_trigger_ops rpr0521_trigger_ops = { 531 .set_trigger_state = rpr0521_pxs_drdy_set_state, 532 }; 533 534 535 static int rpr0521_buffer_preenable(struct iio_dev *indio_dev) 536 { 537 int err; 538 struct rpr0521_data *data = iio_priv(indio_dev); 539 540 mutex_lock(&data->lock); 541 err = rpr0521_set_power_state(data, true, 542 (RPR0521_MODE_PXS_MASK | RPR0521_MODE_ALS_MASK)); 543 mutex_unlock(&data->lock); 544 if (err) 545 dev_err(&data->client->dev, "_buffer_preenable fail\n"); 546 547 return err; 548 } 549 550 static int rpr0521_buffer_postdisable(struct iio_dev *indio_dev) 551 { 552 int err; 553 struct rpr0521_data *data = iio_priv(indio_dev); 554 555 mutex_lock(&data->lock); 556 err = rpr0521_set_power_state(data, false, 557 (RPR0521_MODE_PXS_MASK | RPR0521_MODE_ALS_MASK)); 558 mutex_unlock(&data->lock); 559 if (err) 560 dev_err(&data->client->dev, "_buffer_postdisable fail\n"); 561 562 return err; 563 } 564 565 static const struct iio_buffer_setup_ops rpr0521_buffer_setup_ops = { 566 .preenable = rpr0521_buffer_preenable, 567 .postdisable = rpr0521_buffer_postdisable, 568 }; 569 570 static int rpr0521_get_gain(struct rpr0521_data *data, int chan, 571 int *val, int *val2) 572 { 573 int ret, reg, idx; 574 575 ret = regmap_read(data->regmap, rpr0521_gain[chan].reg, ®); 576 if (ret < 0) 577 return ret; 578 579 idx = (rpr0521_gain[chan].mask & reg) >> rpr0521_gain[chan].shift; 580 *val = rpr0521_gain[chan].gain[idx].scale; 581 *val2 = rpr0521_gain[chan].gain[idx].uscale; 582 583 return 0; 584 } 585 586 static int rpr0521_set_gain(struct rpr0521_data *data, int chan, 587 int val, int val2) 588 { 589 int i, idx = -EINVAL; 590 591 /* get gain index */ 592 for (i = 0; i < rpr0521_gain[chan].size; i++) 593 if (val == rpr0521_gain[chan].gain[i].scale && 594 val2 == rpr0521_gain[chan].gain[i].uscale) { 595 idx = i; 596 break; 597 } 598 599 if (idx < 0) 600 return idx; 601 602 return regmap_update_bits(data->regmap, rpr0521_gain[chan].reg, 603 rpr0521_gain[chan].mask, 604 idx << rpr0521_gain[chan].shift); 605 } 606 607 static int rpr0521_read_samp_freq(struct rpr0521_data *data, 608 enum iio_chan_type chan_type, 609 int *val, int *val2) 610 { 611 int reg, ret; 612 613 ret = regmap_read(data->regmap, RPR0521_REG_MODE_CTRL, ®); 614 if (ret < 0) 615 return ret; 616 617 reg &= RPR0521_MODE_MEAS_TIME_MASK; 618 if (reg >= ARRAY_SIZE(rpr0521_samp_freq_i)) 619 return -EINVAL; 620 621 switch (chan_type) { 622 case IIO_INTENSITY: 623 *val = rpr0521_samp_freq_i[reg].als_hz; 624 *val2 = rpr0521_samp_freq_i[reg].als_uhz; 625 return 0; 626 627 case IIO_PROXIMITY: 628 *val = rpr0521_samp_freq_i[reg].pxs_hz; 629 *val2 = rpr0521_samp_freq_i[reg].pxs_uhz; 630 return 0; 631 632 default: 633 return -EINVAL; 634 } 635 } 636 637 static int rpr0521_write_samp_freq_common(struct rpr0521_data *data, 638 enum iio_chan_type chan_type, 639 int val, int val2) 640 { 641 int i; 642 643 /* 644 * Ignore channel 645 * both pxs and als are setup only to same freq because of simplicity 646 */ 647 switch (val) { 648 case 0: 649 i = 0; 650 break; 651 652 case 2: 653 if (val2 != 500000) 654 return -EINVAL; 655 656 i = 11; 657 break; 658 659 case 10: 660 i = 6; 661 break; 662 663 default: 664 return -EINVAL; 665 } 666 667 return regmap_update_bits(data->regmap, 668 RPR0521_REG_MODE_CTRL, 669 RPR0521_MODE_MEAS_TIME_MASK, 670 i); 671 } 672 673 static int rpr0521_read_ps_offset(struct rpr0521_data *data, int *offset) 674 { 675 int ret; 676 __le16 buffer; 677 678 ret = regmap_bulk_read(data->regmap, 679 RPR0521_REG_PS_OFFSET_LSB, &buffer, sizeof(buffer)); 680 681 if (ret < 0) { 682 dev_err(&data->client->dev, "Failed to read PS OFFSET register\n"); 683 return ret; 684 } 685 *offset = le16_to_cpu(buffer); 686 687 return ret; 688 } 689 690 static int rpr0521_write_ps_offset(struct rpr0521_data *data, int offset) 691 { 692 int ret; 693 __le16 buffer; 694 695 buffer = cpu_to_le16(offset & 0x3ff); 696 ret = regmap_raw_write(data->regmap, 697 RPR0521_REG_PS_OFFSET_LSB, &buffer, sizeof(buffer)); 698 699 if (ret < 0) { 700 dev_err(&data->client->dev, "Failed to write PS OFFSET register\n"); 701 return ret; 702 } 703 704 return ret; 705 } 706 707 static int rpr0521_read_raw(struct iio_dev *indio_dev, 708 struct iio_chan_spec const *chan, int *val, 709 int *val2, long mask) 710 { 711 struct rpr0521_data *data = iio_priv(indio_dev); 712 int ret; 713 int busy; 714 u8 device_mask; 715 __le16 raw_data; 716 717 switch (mask) { 718 case IIO_CHAN_INFO_RAW: 719 if (chan->type != IIO_INTENSITY && chan->type != IIO_PROXIMITY) 720 return -EINVAL; 721 722 busy = iio_device_claim_direct_mode(indio_dev); 723 if (busy) 724 return -EBUSY; 725 726 device_mask = rpr0521_data_reg[chan->address].device_mask; 727 728 mutex_lock(&data->lock); 729 ret = rpr0521_set_power_state(data, true, device_mask); 730 if (ret < 0) 731 goto rpr0521_read_raw_out; 732 733 ret = regmap_bulk_read(data->regmap, 734 rpr0521_data_reg[chan->address].address, 735 &raw_data, sizeof(raw_data)); 736 if (ret < 0) { 737 rpr0521_set_power_state(data, false, device_mask); 738 goto rpr0521_read_raw_out; 739 } 740 741 ret = rpr0521_set_power_state(data, false, device_mask); 742 743 rpr0521_read_raw_out: 744 mutex_unlock(&data->lock); 745 iio_device_release_direct_mode(indio_dev); 746 if (ret < 0) 747 return ret; 748 749 *val = le16_to_cpu(raw_data); 750 751 return IIO_VAL_INT; 752 753 case IIO_CHAN_INFO_SCALE: 754 mutex_lock(&data->lock); 755 ret = rpr0521_get_gain(data, chan->address, val, val2); 756 mutex_unlock(&data->lock); 757 if (ret < 0) 758 return ret; 759 760 return IIO_VAL_INT_PLUS_MICRO; 761 762 case IIO_CHAN_INFO_SAMP_FREQ: 763 mutex_lock(&data->lock); 764 ret = rpr0521_read_samp_freq(data, chan->type, val, val2); 765 mutex_unlock(&data->lock); 766 if (ret < 0) 767 return ret; 768 769 return IIO_VAL_INT_PLUS_MICRO; 770 771 case IIO_CHAN_INFO_OFFSET: 772 mutex_lock(&data->lock); 773 ret = rpr0521_read_ps_offset(data, val); 774 mutex_unlock(&data->lock); 775 if (ret < 0) 776 return ret; 777 778 return IIO_VAL_INT; 779 780 default: 781 return -EINVAL; 782 } 783 } 784 785 static int rpr0521_write_raw(struct iio_dev *indio_dev, 786 struct iio_chan_spec const *chan, int val, 787 int val2, long mask) 788 { 789 struct rpr0521_data *data = iio_priv(indio_dev); 790 int ret; 791 792 switch (mask) { 793 case IIO_CHAN_INFO_SCALE: 794 mutex_lock(&data->lock); 795 ret = rpr0521_set_gain(data, chan->address, val, val2); 796 mutex_unlock(&data->lock); 797 798 return ret; 799 800 case IIO_CHAN_INFO_SAMP_FREQ: 801 mutex_lock(&data->lock); 802 ret = rpr0521_write_samp_freq_common(data, chan->type, 803 val, val2); 804 mutex_unlock(&data->lock); 805 806 return ret; 807 808 case IIO_CHAN_INFO_OFFSET: 809 mutex_lock(&data->lock); 810 ret = rpr0521_write_ps_offset(data, val); 811 mutex_unlock(&data->lock); 812 813 return ret; 814 815 default: 816 return -EINVAL; 817 } 818 } 819 820 static const struct iio_info rpr0521_info = { 821 .read_raw = rpr0521_read_raw, 822 .write_raw = rpr0521_write_raw, 823 .attrs = &rpr0521_attribute_group, 824 }; 825 826 static int rpr0521_init(struct rpr0521_data *data) 827 { 828 int ret; 829 int id; 830 831 ret = regmap_read(data->regmap, RPR0521_REG_ID, &id); 832 if (ret < 0) { 833 dev_err(&data->client->dev, "Failed to read REG_ID register\n"); 834 return ret; 835 } 836 837 if (id != RPR0521_MANUFACT_ID) { 838 dev_err(&data->client->dev, "Wrong id, got %x, expected %x\n", 839 id, RPR0521_MANUFACT_ID); 840 return -ENODEV; 841 } 842 843 /* set default measurement time - 100 ms for both ALS and PS */ 844 ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL, 845 RPR0521_MODE_MEAS_TIME_MASK, 846 RPR0521_DEFAULT_MEAS_TIME); 847 if (ret) { 848 pr_err("regmap_update_bits returned %d\n", ret); 849 return ret; 850 } 851 852 #ifndef CONFIG_PM 853 ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE); 854 if (ret < 0) 855 return ret; 856 ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE); 857 if (ret < 0) 858 return ret; 859 #endif 860 861 data->irq_timestamp = 0; 862 863 return 0; 864 } 865 866 static int rpr0521_poweroff(struct rpr0521_data *data) 867 { 868 int ret; 869 int tmp; 870 871 ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL, 872 RPR0521_MODE_ALS_MASK | 873 RPR0521_MODE_PXS_MASK, 874 RPR0521_MODE_ALS_DISABLE | 875 RPR0521_MODE_PXS_DISABLE); 876 if (ret < 0) 877 return ret; 878 879 data->als_dev_en = false; 880 data->pxs_dev_en = false; 881 882 /* 883 * Int pin keeps state after power off. Set pin to high impedance 884 * mode to prevent power drain. 885 */ 886 ret = regmap_read(data->regmap, RPR0521_REG_INTERRUPT, &tmp); 887 if (ret) { 888 dev_err(&data->client->dev, "Failed to reset int pin.\n"); 889 return ret; 890 } 891 892 return 0; 893 } 894 895 static bool rpr0521_is_volatile_reg(struct device *dev, unsigned int reg) 896 { 897 switch (reg) { 898 case RPR0521_REG_MODE_CTRL: 899 case RPR0521_REG_ALS_CTRL: 900 case RPR0521_REG_PXS_CTRL: 901 return false; 902 default: 903 return true; 904 } 905 } 906 907 static const struct regmap_config rpr0521_regmap_config = { 908 .name = RPR0521_REGMAP_NAME, 909 910 .reg_bits = 8, 911 .val_bits = 8, 912 913 .max_register = RPR0521_REG_ID, 914 .cache_type = REGCACHE_RBTREE, 915 .volatile_reg = rpr0521_is_volatile_reg, 916 }; 917 918 static int rpr0521_probe(struct i2c_client *client) 919 { 920 struct rpr0521_data *data; 921 struct iio_dev *indio_dev; 922 struct regmap *regmap; 923 int ret; 924 925 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); 926 if (!indio_dev) 927 return -ENOMEM; 928 929 regmap = devm_regmap_init_i2c(client, &rpr0521_regmap_config); 930 if (IS_ERR(regmap)) { 931 dev_err(&client->dev, "regmap_init failed!\n"); 932 return PTR_ERR(regmap); 933 } 934 935 data = iio_priv(indio_dev); 936 i2c_set_clientdata(client, indio_dev); 937 data->client = client; 938 data->regmap = regmap; 939 940 mutex_init(&data->lock); 941 942 indio_dev->info = &rpr0521_info; 943 indio_dev->name = RPR0521_DRV_NAME; 944 indio_dev->channels = rpr0521_channels; 945 indio_dev->num_channels = ARRAY_SIZE(rpr0521_channels); 946 indio_dev->modes = INDIO_DIRECT_MODE; 947 948 ret = rpr0521_init(data); 949 if (ret < 0) { 950 dev_err(&client->dev, "rpr0521 chip init failed\n"); 951 return ret; 952 } 953 954 ret = pm_runtime_set_active(&client->dev); 955 if (ret < 0) 956 goto err_poweroff; 957 958 pm_runtime_enable(&client->dev); 959 pm_runtime_set_autosuspend_delay(&client->dev, RPR0521_SLEEP_DELAY_MS); 960 pm_runtime_use_autosuspend(&client->dev); 961 962 /* 963 * If sensor write/read is needed in _probe after _use_autosuspend, 964 * sensor needs to be _resumed first using rpr0521_set_power_state(). 965 */ 966 967 /* IRQ to trigger setup */ 968 if (client->irq) { 969 /* Trigger0 producer setup */ 970 data->drdy_trigger0 = devm_iio_trigger_alloc( 971 indio_dev->dev.parent, 972 "%s-dev%d", indio_dev->name, iio_device_id(indio_dev)); 973 if (!data->drdy_trigger0) { 974 ret = -ENOMEM; 975 goto err_pm_disable; 976 } 977 data->drdy_trigger0->ops = &rpr0521_trigger_ops; 978 indio_dev->available_scan_masks = rpr0521_available_scan_masks; 979 iio_trigger_set_drvdata(data->drdy_trigger0, indio_dev); 980 981 /* Ties irq to trigger producer handler. */ 982 ret = devm_request_threaded_irq(&client->dev, client->irq, 983 rpr0521_drdy_irq_handler, rpr0521_drdy_irq_thread, 984 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 985 RPR0521_IRQ_NAME, indio_dev); 986 if (ret < 0) { 987 dev_err(&client->dev, "request irq %d for trigger0 failed\n", 988 client->irq); 989 goto err_pm_disable; 990 } 991 992 ret = devm_iio_trigger_register(indio_dev->dev.parent, 993 data->drdy_trigger0); 994 if (ret) { 995 dev_err(&client->dev, "iio trigger register failed\n"); 996 goto err_pm_disable; 997 } 998 999 /* 1000 * Now whole pipe from physical interrupt (irq defined by 1001 * devicetree to device) to trigger0 output is set up. 1002 */ 1003 1004 /* Trigger consumer setup */ 1005 ret = devm_iio_triggered_buffer_setup(indio_dev->dev.parent, 1006 indio_dev, 1007 iio_pollfunc_store_time, 1008 rpr0521_trigger_consumer_handler, 1009 &rpr0521_buffer_setup_ops); 1010 if (ret < 0) { 1011 dev_err(&client->dev, "iio triggered buffer setup failed\n"); 1012 goto err_pm_disable; 1013 } 1014 } 1015 1016 ret = iio_device_register(indio_dev); 1017 if (ret) 1018 goto err_pm_disable; 1019 1020 return 0; 1021 1022 err_pm_disable: 1023 pm_runtime_disable(&client->dev); 1024 pm_runtime_set_suspended(&client->dev); 1025 err_poweroff: 1026 rpr0521_poweroff(data); 1027 1028 return ret; 1029 } 1030 1031 static void rpr0521_remove(struct i2c_client *client) 1032 { 1033 struct iio_dev *indio_dev = i2c_get_clientdata(client); 1034 1035 iio_device_unregister(indio_dev); 1036 1037 pm_runtime_disable(&client->dev); 1038 pm_runtime_set_suspended(&client->dev); 1039 1040 rpr0521_poweroff(iio_priv(indio_dev)); 1041 } 1042 1043 static int rpr0521_runtime_suspend(struct device *dev) 1044 { 1045 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 1046 struct rpr0521_data *data = iio_priv(indio_dev); 1047 int ret; 1048 1049 mutex_lock(&data->lock); 1050 /* If measurements are enabled, enable them on resume */ 1051 if (!data->als_need_dis) 1052 data->als_ps_need_en = data->als_dev_en; 1053 if (!data->pxs_need_dis) 1054 data->pxs_ps_need_en = data->pxs_dev_en; 1055 1056 /* disable channels and sets {als,pxs}_dev_en to false */ 1057 ret = rpr0521_poweroff(data); 1058 regcache_mark_dirty(data->regmap); 1059 mutex_unlock(&data->lock); 1060 1061 return ret; 1062 } 1063 1064 static int rpr0521_runtime_resume(struct device *dev) 1065 { 1066 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 1067 struct rpr0521_data *data = iio_priv(indio_dev); 1068 int ret; 1069 1070 regcache_sync(data->regmap); 1071 if (data->als_ps_need_en) { 1072 ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE); 1073 if (ret < 0) 1074 return ret; 1075 data->als_ps_need_en = false; 1076 } 1077 1078 if (data->pxs_ps_need_en) { 1079 ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE); 1080 if (ret < 0) 1081 return ret; 1082 data->pxs_ps_need_en = false; 1083 } 1084 msleep(100); //wait for first measurement result 1085 1086 return 0; 1087 } 1088 1089 static const struct dev_pm_ops rpr0521_pm_ops = { 1090 RUNTIME_PM_OPS(rpr0521_runtime_suspend, rpr0521_runtime_resume, NULL) 1091 }; 1092 1093 static const struct acpi_device_id rpr0521_acpi_match[] = { 1094 {"RPR0521", 0}, 1095 { } 1096 }; 1097 MODULE_DEVICE_TABLE(acpi, rpr0521_acpi_match); 1098 1099 static const struct i2c_device_id rpr0521_id[] = { 1100 { "rpr0521" }, 1101 { } 1102 }; 1103 1104 MODULE_DEVICE_TABLE(i2c, rpr0521_id); 1105 1106 static struct i2c_driver rpr0521_driver = { 1107 .driver = { 1108 .name = RPR0521_DRV_NAME, 1109 .pm = pm_ptr(&rpr0521_pm_ops), 1110 .acpi_match_table = rpr0521_acpi_match, 1111 }, 1112 .probe = rpr0521_probe, 1113 .remove = rpr0521_remove, 1114 .id_table = rpr0521_id, 1115 }; 1116 1117 module_i2c_driver(rpr0521_driver); 1118 1119 MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>"); 1120 MODULE_DESCRIPTION("RPR0521 ROHM Ambient Light and Proximity Sensor driver"); 1121 MODULE_LICENSE("GPL v2"); 1122