1 /* 2 * RPR-0521 ROHM Ambient Light and Proximity Sensor 3 * 4 * Copyright (c) 2015, Intel Corporation. 5 * 6 * This file is subject to the terms and conditions of version 2 of 7 * the GNU General Public License. See the file COPYING in the main 8 * directory of this archive for more details. 9 * 10 * IIO driver for RPR-0521RS (7-bit I2C slave address 0x38). 11 * 12 * TODO: illuminance channel 13 */ 14 15 #include <linux/module.h> 16 #include <linux/init.h> 17 #include <linux/i2c.h> 18 #include <linux/regmap.h> 19 #include <linux/delay.h> 20 #include <linux/acpi.h> 21 22 #include <linux/iio/iio.h> 23 #include <linux/iio/buffer.h> 24 #include <linux/iio/trigger.h> 25 #include <linux/iio/trigger_consumer.h> 26 #include <linux/iio/triggered_buffer.h> 27 #include <linux/iio/sysfs.h> 28 #include <linux/pm_runtime.h> 29 30 #define RPR0521_REG_SYSTEM_CTRL 0x40 31 #define RPR0521_REG_MODE_CTRL 0x41 32 #define RPR0521_REG_ALS_CTRL 0x42 33 #define RPR0521_REG_PXS_CTRL 0x43 34 #define RPR0521_REG_PXS_DATA 0x44 /* 16-bit, little endian */ 35 #define RPR0521_REG_ALS_DATA0 0x46 /* 16-bit, little endian */ 36 #define RPR0521_REG_ALS_DATA1 0x48 /* 16-bit, little endian */ 37 #define RPR0521_REG_INTERRUPT 0x4A 38 #define RPR0521_REG_PS_OFFSET_LSB 0x53 39 #define RPR0521_REG_ID 0x92 40 41 #define RPR0521_MODE_ALS_MASK BIT(7) 42 #define RPR0521_MODE_PXS_MASK BIT(6) 43 #define RPR0521_MODE_MEAS_TIME_MASK GENMASK(3, 0) 44 #define RPR0521_ALS_DATA0_GAIN_MASK GENMASK(5, 4) 45 #define RPR0521_ALS_DATA0_GAIN_SHIFT 4 46 #define RPR0521_ALS_DATA1_GAIN_MASK GENMASK(3, 2) 47 #define RPR0521_ALS_DATA1_GAIN_SHIFT 2 48 #define RPR0521_PXS_GAIN_MASK GENMASK(5, 4) 49 #define RPR0521_PXS_GAIN_SHIFT 4 50 #define RPR0521_PXS_PERSISTENCE_MASK GENMASK(3, 0) 51 #define RPR0521_INTERRUPT_INT_TRIG_PS_MASK BIT(0) 52 #define RPR0521_INTERRUPT_INT_TRIG_ALS_MASK BIT(1) 53 #define RPR0521_INTERRUPT_INT_REASSERT_MASK BIT(3) 54 #define RPR0521_INTERRUPT_ALS_INT_STATUS_MASK BIT(6) 55 #define RPR0521_INTERRUPT_PS_INT_STATUS_MASK BIT(7) 56 57 #define RPR0521_MODE_ALS_ENABLE BIT(7) 58 #define RPR0521_MODE_ALS_DISABLE 0x00 59 #define RPR0521_MODE_PXS_ENABLE BIT(6) 60 #define RPR0521_MODE_PXS_DISABLE 0x00 61 #define RPR0521_PXS_PERSISTENCE_DRDY 0x00 62 63 #define RPR0521_INTERRUPT_INT_TRIG_PS_ENABLE BIT(0) 64 #define RPR0521_INTERRUPT_INT_TRIG_PS_DISABLE 0x00 65 #define RPR0521_INTERRUPT_INT_TRIG_ALS_ENABLE BIT(1) 66 #define RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE 0x00 67 #define RPR0521_INTERRUPT_INT_REASSERT_ENABLE BIT(3) 68 #define RPR0521_INTERRUPT_INT_REASSERT_DISABLE 0x00 69 70 #define RPR0521_MANUFACT_ID 0xE0 71 #define RPR0521_DEFAULT_MEAS_TIME 0x06 /* ALS - 100ms, PXS - 100ms */ 72 73 #define RPR0521_DRV_NAME "RPR0521" 74 #define RPR0521_IRQ_NAME "rpr0521_event" 75 #define RPR0521_REGMAP_NAME "rpr0521_regmap" 76 77 #define RPR0521_SLEEP_DELAY_MS 2000 78 79 #define RPR0521_ALS_SCALE_AVAIL "0.007812 0.015625 0.5 1" 80 #define RPR0521_PXS_SCALE_AVAIL "0.125 0.5 1" 81 82 struct rpr0521_gain { 83 int scale; 84 int uscale; 85 }; 86 87 static const struct rpr0521_gain rpr0521_als_gain[4] = { 88 {1, 0}, /* x1 */ 89 {0, 500000}, /* x2 */ 90 {0, 15625}, /* x64 */ 91 {0, 7812}, /* x128 */ 92 }; 93 94 static const struct rpr0521_gain rpr0521_pxs_gain[3] = { 95 {1, 0}, /* x1 */ 96 {0, 500000}, /* x2 */ 97 {0, 125000}, /* x4 */ 98 }; 99 100 enum rpr0521_channel { 101 RPR0521_CHAN_PXS, 102 RPR0521_CHAN_ALS_DATA0, 103 RPR0521_CHAN_ALS_DATA1, 104 }; 105 106 struct rpr0521_reg_desc { 107 u8 address; 108 u8 device_mask; 109 }; 110 111 static const struct rpr0521_reg_desc rpr0521_data_reg[] = { 112 [RPR0521_CHAN_PXS] = { 113 .address = RPR0521_REG_PXS_DATA, 114 .device_mask = RPR0521_MODE_PXS_MASK, 115 }, 116 [RPR0521_CHAN_ALS_DATA0] = { 117 .address = RPR0521_REG_ALS_DATA0, 118 .device_mask = RPR0521_MODE_ALS_MASK, 119 }, 120 [RPR0521_CHAN_ALS_DATA1] = { 121 .address = RPR0521_REG_ALS_DATA1, 122 .device_mask = RPR0521_MODE_ALS_MASK, 123 }, 124 }; 125 126 static const struct rpr0521_gain_info { 127 u8 reg; 128 u8 mask; 129 u8 shift; 130 const struct rpr0521_gain *gain; 131 int size; 132 } rpr0521_gain[] = { 133 [RPR0521_CHAN_PXS] = { 134 .reg = RPR0521_REG_PXS_CTRL, 135 .mask = RPR0521_PXS_GAIN_MASK, 136 .shift = RPR0521_PXS_GAIN_SHIFT, 137 .gain = rpr0521_pxs_gain, 138 .size = ARRAY_SIZE(rpr0521_pxs_gain), 139 }, 140 [RPR0521_CHAN_ALS_DATA0] = { 141 .reg = RPR0521_REG_ALS_CTRL, 142 .mask = RPR0521_ALS_DATA0_GAIN_MASK, 143 .shift = RPR0521_ALS_DATA0_GAIN_SHIFT, 144 .gain = rpr0521_als_gain, 145 .size = ARRAY_SIZE(rpr0521_als_gain), 146 }, 147 [RPR0521_CHAN_ALS_DATA1] = { 148 .reg = RPR0521_REG_ALS_CTRL, 149 .mask = RPR0521_ALS_DATA1_GAIN_MASK, 150 .shift = RPR0521_ALS_DATA1_GAIN_SHIFT, 151 .gain = rpr0521_als_gain, 152 .size = ARRAY_SIZE(rpr0521_als_gain), 153 }, 154 }; 155 156 struct rpr0521_samp_freq { 157 int als_hz; 158 int als_uhz; 159 int pxs_hz; 160 int pxs_uhz; 161 }; 162 163 static const struct rpr0521_samp_freq rpr0521_samp_freq_i[13] = { 164 /* {ALS, PXS}, W==currently writable option */ 165 {0, 0, 0, 0}, /* W0000, 0=standby */ 166 {0, 0, 100, 0}, /* 0001 */ 167 {0, 0, 25, 0}, /* 0010 */ 168 {0, 0, 10, 0}, /* 0011 */ 169 {0, 0, 2, 500000}, /* 0100 */ 170 {10, 0, 20, 0}, /* 0101 */ 171 {10, 0, 10, 0}, /* W0110 */ 172 {10, 0, 2, 500000}, /* 0111 */ 173 {2, 500000, 20, 0}, /* 1000, measurement 100ms, sleep 300ms */ 174 {2, 500000, 10, 0}, /* 1001, measurement 100ms, sleep 300ms */ 175 {2, 500000, 0, 0}, /* 1010, high sensitivity mode */ 176 {2, 500000, 2, 500000}, /* W1011, high sensitivity mode */ 177 {20, 0, 20, 0} /* 1100, ALS_data x 0.5, see specification P.18 */ 178 }; 179 180 struct rpr0521_data { 181 struct i2c_client *client; 182 183 /* protect device params updates (e.g state, gain) */ 184 struct mutex lock; 185 186 /* device active status */ 187 bool als_dev_en; 188 bool pxs_dev_en; 189 190 struct iio_trigger *drdy_trigger0; 191 s64 irq_timestamp; 192 193 /* optimize runtime pm ops - enable/disable device only if needed */ 194 bool als_ps_need_en; 195 bool pxs_ps_need_en; 196 bool als_need_dis; 197 bool pxs_need_dis; 198 199 struct regmap *regmap; 200 }; 201 202 static IIO_CONST_ATTR(in_intensity_scale_available, RPR0521_ALS_SCALE_AVAIL); 203 static IIO_CONST_ATTR(in_proximity_scale_available, RPR0521_PXS_SCALE_AVAIL); 204 205 /* 206 * Start with easy freq first, whole table of freq combinations is more 207 * complicated. 208 */ 209 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("2.5 10"); 210 211 static struct attribute *rpr0521_attributes[] = { 212 &iio_const_attr_in_intensity_scale_available.dev_attr.attr, 213 &iio_const_attr_in_proximity_scale_available.dev_attr.attr, 214 &iio_const_attr_sampling_frequency_available.dev_attr.attr, 215 NULL, 216 }; 217 218 static const struct attribute_group rpr0521_attribute_group = { 219 .attrs = rpr0521_attributes, 220 }; 221 222 /* Order of the channel data in buffer */ 223 enum rpr0521_scan_index_order { 224 RPR0521_CHAN_INDEX_PXS, 225 RPR0521_CHAN_INDEX_BOTH, 226 RPR0521_CHAN_INDEX_IR, 227 }; 228 229 static const unsigned long rpr0521_available_scan_masks[] = { 230 BIT(RPR0521_CHAN_INDEX_PXS) | BIT(RPR0521_CHAN_INDEX_BOTH) | 231 BIT(RPR0521_CHAN_INDEX_IR), 232 0 233 }; 234 235 static const struct iio_chan_spec rpr0521_channels[] = { 236 { 237 .type = IIO_PROXIMITY, 238 .address = RPR0521_CHAN_PXS, 239 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 240 BIT(IIO_CHAN_INFO_OFFSET) | 241 BIT(IIO_CHAN_INFO_SCALE), 242 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), 243 .scan_index = RPR0521_CHAN_INDEX_PXS, 244 .scan_type = { 245 .sign = 'u', 246 .realbits = 16, 247 .storagebits = 16, 248 .endianness = IIO_LE, 249 }, 250 }, 251 { 252 .type = IIO_INTENSITY, 253 .modified = 1, 254 .address = RPR0521_CHAN_ALS_DATA0, 255 .channel2 = IIO_MOD_LIGHT_BOTH, 256 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 257 BIT(IIO_CHAN_INFO_SCALE), 258 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), 259 .scan_index = RPR0521_CHAN_INDEX_BOTH, 260 .scan_type = { 261 .sign = 'u', 262 .realbits = 16, 263 .storagebits = 16, 264 .endianness = IIO_LE, 265 }, 266 }, 267 { 268 .type = IIO_INTENSITY, 269 .modified = 1, 270 .address = RPR0521_CHAN_ALS_DATA1, 271 .channel2 = IIO_MOD_LIGHT_IR, 272 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 273 BIT(IIO_CHAN_INFO_SCALE), 274 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), 275 .scan_index = RPR0521_CHAN_INDEX_IR, 276 .scan_type = { 277 .sign = 'u', 278 .realbits = 16, 279 .storagebits = 16, 280 .endianness = IIO_LE, 281 }, 282 }, 283 }; 284 285 static int rpr0521_als_enable(struct rpr0521_data *data, u8 status) 286 { 287 int ret; 288 289 ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL, 290 RPR0521_MODE_ALS_MASK, 291 status); 292 if (ret < 0) 293 return ret; 294 295 if (status & RPR0521_MODE_ALS_MASK) 296 data->als_dev_en = true; 297 else 298 data->als_dev_en = false; 299 300 return 0; 301 } 302 303 static int rpr0521_pxs_enable(struct rpr0521_data *data, u8 status) 304 { 305 int ret; 306 307 ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL, 308 RPR0521_MODE_PXS_MASK, 309 status); 310 if (ret < 0) 311 return ret; 312 313 if (status & RPR0521_MODE_PXS_MASK) 314 data->pxs_dev_en = true; 315 else 316 data->pxs_dev_en = false; 317 318 return 0; 319 } 320 321 /** 322 * rpr0521_set_power_state - handles runtime PM state and sensors enabled status 323 * 324 * @data: rpr0521 device private data 325 * @on: state to be set for devices in @device_mask 326 * @device_mask: bitmask specifying for which device we need to update @on state 327 * 328 * Calls for this function must be balanced so that each ON should have matching 329 * OFF. Otherwise pm usage_count gets out of sync. 330 */ 331 static int rpr0521_set_power_state(struct rpr0521_data *data, bool on, 332 u8 device_mask) 333 { 334 #ifdef CONFIG_PM 335 int ret; 336 337 if (device_mask & RPR0521_MODE_ALS_MASK) { 338 data->als_ps_need_en = on; 339 data->als_need_dis = !on; 340 } 341 342 if (device_mask & RPR0521_MODE_PXS_MASK) { 343 data->pxs_ps_need_en = on; 344 data->pxs_need_dis = !on; 345 } 346 347 /* 348 * On: _resume() is called only when we are suspended 349 * Off: _suspend() is called after delay if _resume() is not 350 * called before that. 351 * Note: If either measurement is re-enabled before _suspend(), 352 * both stay enabled until _suspend(). 353 */ 354 if (on) { 355 ret = pm_runtime_get_sync(&data->client->dev); 356 } else { 357 pm_runtime_mark_last_busy(&data->client->dev); 358 ret = pm_runtime_put_autosuspend(&data->client->dev); 359 } 360 if (ret < 0) { 361 dev_err(&data->client->dev, 362 "Failed: rpr0521_set_power_state for %d, ret %d\n", 363 on, ret); 364 if (on) 365 pm_runtime_put_noidle(&data->client->dev); 366 367 return ret; 368 } 369 370 if (on) { 371 /* If _resume() was not called, enable measurement now. */ 372 if (data->als_ps_need_en) { 373 ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE); 374 if (ret) 375 return ret; 376 data->als_ps_need_en = false; 377 } 378 379 if (data->pxs_ps_need_en) { 380 ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE); 381 if (ret) 382 return ret; 383 data->pxs_ps_need_en = false; 384 } 385 } 386 #endif 387 return 0; 388 } 389 390 /* Interrupt register tells if this sensor caused the interrupt or not. */ 391 static inline bool rpr0521_is_triggered(struct rpr0521_data *data) 392 { 393 int ret; 394 int reg; 395 396 ret = regmap_read(data->regmap, RPR0521_REG_INTERRUPT, ®); 397 if (ret < 0) 398 return false; /* Reg read failed. */ 399 if (reg & 400 (RPR0521_INTERRUPT_ALS_INT_STATUS_MASK | 401 RPR0521_INTERRUPT_PS_INT_STATUS_MASK)) 402 return true; 403 else 404 return false; /* Int not from this sensor. */ 405 } 406 407 /* IRQ to trigger handler */ 408 static irqreturn_t rpr0521_drdy_irq_handler(int irq, void *private) 409 { 410 struct iio_dev *indio_dev = private; 411 struct rpr0521_data *data = iio_priv(indio_dev); 412 413 data->irq_timestamp = iio_get_time_ns(indio_dev); 414 /* 415 * We need to wake the thread to read the interrupt reg. It 416 * is not possible to do that here because regmap_read takes a 417 * mutex. 418 */ 419 420 return IRQ_WAKE_THREAD; 421 } 422 423 static irqreturn_t rpr0521_drdy_irq_thread(int irq, void *private) 424 { 425 struct iio_dev *indio_dev = private; 426 struct rpr0521_data *data = iio_priv(indio_dev); 427 428 if (rpr0521_is_triggered(data)) { 429 iio_trigger_poll_chained(data->drdy_trigger0); 430 return IRQ_HANDLED; 431 } 432 433 return IRQ_NONE; 434 } 435 436 static irqreturn_t rpr0521_trigger_consumer_store_time(int irq, void *p) 437 { 438 struct iio_poll_func *pf = p; 439 struct iio_dev *indio_dev = pf->indio_dev; 440 441 /* Other trigger polls store time here. */ 442 if (!iio_trigger_using_own(indio_dev)) 443 pf->timestamp = iio_get_time_ns(indio_dev); 444 445 return IRQ_WAKE_THREAD; 446 } 447 448 static irqreturn_t rpr0521_trigger_consumer_handler(int irq, void *p) 449 { 450 struct iio_poll_func *pf = p; 451 struct iio_dev *indio_dev = pf->indio_dev; 452 struct rpr0521_data *data = iio_priv(indio_dev); 453 int err; 454 455 u8 buffer[16]; /* 3 16-bit channels + padding + ts */ 456 457 /* Use irq timestamp when reasonable. */ 458 if (iio_trigger_using_own(indio_dev) && data->irq_timestamp) { 459 pf->timestamp = data->irq_timestamp; 460 data->irq_timestamp = 0; 461 } 462 /* Other chained trigger polls get timestamp only here. */ 463 if (!pf->timestamp) 464 pf->timestamp = iio_get_time_ns(indio_dev); 465 466 err = regmap_bulk_read(data->regmap, RPR0521_REG_PXS_DATA, 467 &buffer, 468 (3 * 2) + 1); /* 3 * 16-bit + (discarded) int clear reg. */ 469 if (!err) 470 iio_push_to_buffers_with_timestamp(indio_dev, 471 buffer, pf->timestamp); 472 else 473 dev_err(&data->client->dev, 474 "Trigger consumer can't read from sensor.\n"); 475 pf->timestamp = 0; 476 477 iio_trigger_notify_done(indio_dev->trig); 478 479 return IRQ_HANDLED; 480 } 481 482 static int rpr0521_write_int_enable(struct rpr0521_data *data) 483 { 484 int err; 485 486 /* Interrupt after each measurement */ 487 err = regmap_update_bits(data->regmap, RPR0521_REG_PXS_CTRL, 488 RPR0521_PXS_PERSISTENCE_MASK, 489 RPR0521_PXS_PERSISTENCE_DRDY); 490 if (err) { 491 dev_err(&data->client->dev, "PS control reg write fail.\n"); 492 return -EBUSY; 493 } 494 495 /* Ignore latch and mode because of drdy */ 496 err = regmap_write(data->regmap, RPR0521_REG_INTERRUPT, 497 RPR0521_INTERRUPT_INT_REASSERT_DISABLE | 498 RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE | 499 RPR0521_INTERRUPT_INT_TRIG_PS_ENABLE 500 ); 501 if (err) { 502 dev_err(&data->client->dev, "Interrupt setup write fail.\n"); 503 return -EBUSY; 504 } 505 506 return 0; 507 } 508 509 static int rpr0521_write_int_disable(struct rpr0521_data *data) 510 { 511 /* Don't care of clearing mode, assert and latch. */ 512 return regmap_write(data->regmap, RPR0521_REG_INTERRUPT, 513 RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE | 514 RPR0521_INTERRUPT_INT_TRIG_PS_DISABLE 515 ); 516 } 517 518 /* 519 * Trigger producer enable / disable. Note that there will be trigs only when 520 * measurement data is ready to be read. 521 */ 522 static int rpr0521_pxs_drdy_set_state(struct iio_trigger *trigger, 523 bool enable_drdy) 524 { 525 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trigger); 526 struct rpr0521_data *data = iio_priv(indio_dev); 527 int err; 528 529 if (enable_drdy) 530 err = rpr0521_write_int_enable(data); 531 else 532 err = rpr0521_write_int_disable(data); 533 if (err) 534 dev_err(&data->client->dev, "rpr0521_pxs_drdy_set_state failed\n"); 535 536 return err; 537 } 538 539 static const struct iio_trigger_ops rpr0521_trigger_ops = { 540 .set_trigger_state = rpr0521_pxs_drdy_set_state, 541 .owner = THIS_MODULE, 542 }; 543 544 545 static int rpr0521_buffer_preenable(struct iio_dev *indio_dev) 546 { 547 int err; 548 struct rpr0521_data *data = iio_priv(indio_dev); 549 550 mutex_lock(&data->lock); 551 err = rpr0521_set_power_state(data, true, 552 (RPR0521_MODE_PXS_MASK | RPR0521_MODE_ALS_MASK)); 553 mutex_unlock(&data->lock); 554 if (err) 555 dev_err(&data->client->dev, "_buffer_preenable fail\n"); 556 557 return err; 558 } 559 560 static int rpr0521_buffer_postdisable(struct iio_dev *indio_dev) 561 { 562 int err; 563 struct rpr0521_data *data = iio_priv(indio_dev); 564 565 mutex_lock(&data->lock); 566 err = rpr0521_set_power_state(data, false, 567 (RPR0521_MODE_PXS_MASK | RPR0521_MODE_ALS_MASK)); 568 mutex_unlock(&data->lock); 569 if (err) 570 dev_err(&data->client->dev, "_buffer_postdisable fail\n"); 571 572 return err; 573 } 574 575 static const struct iio_buffer_setup_ops rpr0521_buffer_setup_ops = { 576 .preenable = rpr0521_buffer_preenable, 577 .postenable = iio_triggered_buffer_postenable, 578 .predisable = iio_triggered_buffer_predisable, 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 .driver_module = THIS_MODULE, 834 .read_raw = rpr0521_read_raw, 835 .write_raw = rpr0521_write_raw, 836 .attrs = &rpr0521_attribute_group, 837 }; 838 839 static int rpr0521_init(struct rpr0521_data *data) 840 { 841 int ret; 842 int id; 843 844 ret = regmap_read(data->regmap, RPR0521_REG_ID, &id); 845 if (ret < 0) { 846 dev_err(&data->client->dev, "Failed to read REG_ID register\n"); 847 return ret; 848 } 849 850 if (id != RPR0521_MANUFACT_ID) { 851 dev_err(&data->client->dev, "Wrong id, got %x, expected %x\n", 852 id, RPR0521_MANUFACT_ID); 853 return -ENODEV; 854 } 855 856 /* set default measurement time - 100 ms for both ALS and PS */ 857 ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL, 858 RPR0521_MODE_MEAS_TIME_MASK, 859 RPR0521_DEFAULT_MEAS_TIME); 860 if (ret) { 861 pr_err("regmap_update_bits returned %d\n", ret); 862 return ret; 863 } 864 865 #ifndef CONFIG_PM 866 ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE); 867 if (ret < 0) 868 return ret; 869 ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE); 870 if (ret < 0) 871 return ret; 872 #endif 873 874 data->irq_timestamp = 0; 875 876 return 0; 877 } 878 879 static int rpr0521_poweroff(struct rpr0521_data *data) 880 { 881 int ret; 882 int tmp; 883 884 ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL, 885 RPR0521_MODE_ALS_MASK | 886 RPR0521_MODE_PXS_MASK, 887 RPR0521_MODE_ALS_DISABLE | 888 RPR0521_MODE_PXS_DISABLE); 889 if (ret < 0) 890 return ret; 891 892 data->als_dev_en = false; 893 data->pxs_dev_en = false; 894 895 /* 896 * Int pin keeps state after power off. Set pin to high impedance 897 * mode to prevent power drain. 898 */ 899 ret = regmap_read(data->regmap, RPR0521_REG_INTERRUPT, &tmp); 900 if (ret) { 901 dev_err(&data->client->dev, "Failed to reset int pin.\n"); 902 return ret; 903 } 904 905 return 0; 906 } 907 908 static bool rpr0521_is_volatile_reg(struct device *dev, unsigned int reg) 909 { 910 switch (reg) { 911 case RPR0521_REG_MODE_CTRL: 912 case RPR0521_REG_ALS_CTRL: 913 case RPR0521_REG_PXS_CTRL: 914 return false; 915 default: 916 return true; 917 } 918 } 919 920 static const struct regmap_config rpr0521_regmap_config = { 921 .name = RPR0521_REGMAP_NAME, 922 923 .reg_bits = 8, 924 .val_bits = 8, 925 926 .max_register = RPR0521_REG_ID, 927 .cache_type = REGCACHE_RBTREE, 928 .volatile_reg = rpr0521_is_volatile_reg, 929 }; 930 931 static int rpr0521_probe(struct i2c_client *client, 932 const struct i2c_device_id *id) 933 { 934 struct rpr0521_data *data; 935 struct iio_dev *indio_dev; 936 struct regmap *regmap; 937 int ret; 938 939 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); 940 if (!indio_dev) 941 return -ENOMEM; 942 943 regmap = devm_regmap_init_i2c(client, &rpr0521_regmap_config); 944 if (IS_ERR(regmap)) { 945 dev_err(&client->dev, "regmap_init failed!\n"); 946 return PTR_ERR(regmap); 947 } 948 949 data = iio_priv(indio_dev); 950 i2c_set_clientdata(client, indio_dev); 951 data->client = client; 952 data->regmap = regmap; 953 954 mutex_init(&data->lock); 955 956 indio_dev->dev.parent = &client->dev; 957 indio_dev->info = &rpr0521_info; 958 indio_dev->name = RPR0521_DRV_NAME; 959 indio_dev->channels = rpr0521_channels; 960 indio_dev->num_channels = ARRAY_SIZE(rpr0521_channels); 961 indio_dev->modes = INDIO_DIRECT_MODE; 962 963 ret = rpr0521_init(data); 964 if (ret < 0) { 965 dev_err(&client->dev, "rpr0521 chip init failed\n"); 966 return ret; 967 } 968 969 ret = pm_runtime_set_active(&client->dev); 970 if (ret < 0) 971 goto err_poweroff; 972 973 pm_runtime_enable(&client->dev); 974 pm_runtime_set_autosuspend_delay(&client->dev, RPR0521_SLEEP_DELAY_MS); 975 pm_runtime_use_autosuspend(&client->dev); 976 977 /* 978 * If sensor write/read is needed in _probe after _use_autosuspend, 979 * sensor needs to be _resumed first using rpr0521_set_power_state(). 980 */ 981 982 /* IRQ to trigger setup */ 983 if (client->irq) { 984 /* Trigger0 producer setup */ 985 data->drdy_trigger0 = devm_iio_trigger_alloc( 986 indio_dev->dev.parent, 987 "%s-dev%d", indio_dev->name, indio_dev->id); 988 if (!data->drdy_trigger0) { 989 ret = -ENOMEM; 990 goto err_pm_disable; 991 } 992 data->drdy_trigger0->dev.parent = indio_dev->dev.parent; 993 data->drdy_trigger0->ops = &rpr0521_trigger_ops; 994 indio_dev->available_scan_masks = rpr0521_available_scan_masks; 995 iio_trigger_set_drvdata(data->drdy_trigger0, indio_dev); 996 997 /* Ties irq to trigger producer handler. */ 998 ret = devm_request_threaded_irq(&client->dev, client->irq, 999 rpr0521_drdy_irq_handler, rpr0521_drdy_irq_thread, 1000 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 1001 RPR0521_IRQ_NAME, indio_dev); 1002 if (ret < 0) { 1003 dev_err(&client->dev, "request irq %d for trigger0 failed\n", 1004 client->irq); 1005 goto err_pm_disable; 1006 } 1007 1008 ret = devm_iio_trigger_register(indio_dev->dev.parent, 1009 data->drdy_trigger0); 1010 if (ret) { 1011 dev_err(&client->dev, "iio trigger register failed\n"); 1012 goto err_pm_disable; 1013 } 1014 1015 /* 1016 * Now whole pipe from physical interrupt (irq defined by 1017 * devicetree to device) to trigger0 output is set up. 1018 */ 1019 1020 /* Trigger consumer setup */ 1021 ret = devm_iio_triggered_buffer_setup(indio_dev->dev.parent, 1022 indio_dev, 1023 rpr0521_trigger_consumer_store_time, 1024 rpr0521_trigger_consumer_handler, 1025 &rpr0521_buffer_setup_ops); 1026 if (ret < 0) { 1027 dev_err(&client->dev, "iio triggered buffer setup failed\n"); 1028 goto err_pm_disable; 1029 } 1030 } 1031 1032 ret = iio_device_register(indio_dev); 1033 if (ret) 1034 goto err_pm_disable; 1035 1036 return 0; 1037 1038 err_pm_disable: 1039 pm_runtime_disable(&client->dev); 1040 pm_runtime_set_suspended(&client->dev); 1041 pm_runtime_put_noidle(&client->dev); 1042 err_poweroff: 1043 rpr0521_poweroff(data); 1044 1045 return ret; 1046 } 1047 1048 static int rpr0521_remove(struct i2c_client *client) 1049 { 1050 struct iio_dev *indio_dev = i2c_get_clientdata(client); 1051 1052 iio_device_unregister(indio_dev); 1053 1054 pm_runtime_disable(&client->dev); 1055 pm_runtime_set_suspended(&client->dev); 1056 pm_runtime_put_noidle(&client->dev); 1057 1058 rpr0521_poweroff(iio_priv(indio_dev)); 1059 1060 return 0; 1061 } 1062 1063 #ifdef CONFIG_PM 1064 static int rpr0521_runtime_suspend(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 mutex_lock(&data->lock); 1071 /* If measurements are enabled, enable them on resume */ 1072 if (!data->als_need_dis) 1073 data->als_ps_need_en = data->als_dev_en; 1074 if (!data->pxs_need_dis) 1075 data->pxs_ps_need_en = data->pxs_dev_en; 1076 1077 /* disable channels and sets {als,pxs}_dev_en to false */ 1078 ret = rpr0521_poweroff(data); 1079 regcache_mark_dirty(data->regmap); 1080 mutex_unlock(&data->lock); 1081 1082 return ret; 1083 } 1084 1085 static int rpr0521_runtime_resume(struct device *dev) 1086 { 1087 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 1088 struct rpr0521_data *data = iio_priv(indio_dev); 1089 int ret; 1090 1091 regcache_sync(data->regmap); 1092 if (data->als_ps_need_en) { 1093 ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE); 1094 if (ret < 0) 1095 return ret; 1096 data->als_ps_need_en = false; 1097 } 1098 1099 if (data->pxs_ps_need_en) { 1100 ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE); 1101 if (ret < 0) 1102 return ret; 1103 data->pxs_ps_need_en = false; 1104 } 1105 msleep(100); //wait for first measurement result 1106 1107 return 0; 1108 } 1109 #endif 1110 1111 static const struct dev_pm_ops rpr0521_pm_ops = { 1112 SET_RUNTIME_PM_OPS(rpr0521_runtime_suspend, 1113 rpr0521_runtime_resume, NULL) 1114 }; 1115 1116 static const struct acpi_device_id rpr0521_acpi_match[] = { 1117 {"RPR0521", 0}, 1118 { } 1119 }; 1120 MODULE_DEVICE_TABLE(acpi, rpr0521_acpi_match); 1121 1122 static const struct i2c_device_id rpr0521_id[] = { 1123 {"rpr0521", 0}, 1124 { } 1125 }; 1126 1127 MODULE_DEVICE_TABLE(i2c, rpr0521_id); 1128 1129 static struct i2c_driver rpr0521_driver = { 1130 .driver = { 1131 .name = RPR0521_DRV_NAME, 1132 .pm = &rpr0521_pm_ops, 1133 .acpi_match_table = ACPI_PTR(rpr0521_acpi_match), 1134 }, 1135 .probe = rpr0521_probe, 1136 .remove = rpr0521_remove, 1137 .id_table = rpr0521_id, 1138 }; 1139 1140 module_i2c_driver(rpr0521_driver); 1141 1142 MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>"); 1143 MODULE_DESCRIPTION("RPR0521 ROHM Ambient Light and Proximity Sensor driver"); 1144 MODULE_LICENSE("GPL v2"); 1145