1 /* 2 * Copyright (c) 2014 Intel Corporation 3 * 4 * Driver for Semtech's SX9500 capacitive proximity/button solution. 5 * Datasheet available at 6 * <http://www.semtech.com/images/datasheet/sx9500.pdf>. 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License version 2 as published by 10 * the Free Software Foundation. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/slab.h> 15 #include <linux/module.h> 16 #include <linux/i2c.h> 17 #include <linux/irq.h> 18 #include <linux/acpi.h> 19 #include <linux/gpio/consumer.h> 20 #include <linux/regmap.h> 21 #include <linux/pm.h> 22 #include <linux/delay.h> 23 24 #include <linux/iio/iio.h> 25 #include <linux/iio/buffer.h> 26 #include <linux/iio/sysfs.h> 27 #include <linux/iio/events.h> 28 #include <linux/iio/trigger.h> 29 #include <linux/iio/triggered_buffer.h> 30 #include <linux/iio/trigger_consumer.h> 31 32 #define SX9500_DRIVER_NAME "sx9500" 33 #define SX9500_IRQ_NAME "sx9500_event" 34 35 #define SX9500_GPIO_INT "interrupt" 36 #define SX9500_GPIO_RESET "reset" 37 38 /* Register definitions. */ 39 #define SX9500_REG_IRQ_SRC 0x00 40 #define SX9500_REG_STAT 0x01 41 #define SX9500_REG_IRQ_MSK 0x03 42 43 #define SX9500_REG_PROX_CTRL0 0x06 44 #define SX9500_REG_PROX_CTRL1 0x07 45 #define SX9500_REG_PROX_CTRL2 0x08 46 #define SX9500_REG_PROX_CTRL3 0x09 47 #define SX9500_REG_PROX_CTRL4 0x0a 48 #define SX9500_REG_PROX_CTRL5 0x0b 49 #define SX9500_REG_PROX_CTRL6 0x0c 50 #define SX9500_REG_PROX_CTRL7 0x0d 51 #define SX9500_REG_PROX_CTRL8 0x0e 52 53 #define SX9500_REG_SENSOR_SEL 0x20 54 #define SX9500_REG_USE_MSB 0x21 55 #define SX9500_REG_USE_LSB 0x22 56 #define SX9500_REG_AVG_MSB 0x23 57 #define SX9500_REG_AVG_LSB 0x24 58 #define SX9500_REG_DIFF_MSB 0x25 59 #define SX9500_REG_DIFF_LSB 0x26 60 #define SX9500_REG_OFFSET_MSB 0x27 61 #define SX9500_REG_OFFSET_LSB 0x28 62 63 #define SX9500_REG_RESET 0x7f 64 65 /* Write this to REG_RESET to do a soft reset. */ 66 #define SX9500_SOFT_RESET 0xde 67 68 #define SX9500_SCAN_PERIOD_MASK GENMASK(6, 4) 69 #define SX9500_SCAN_PERIOD_SHIFT 4 70 71 /* 72 * These serve for identifying IRQ source in the IRQ_SRC register, and 73 * also for masking the IRQs in the IRQ_MSK register. 74 */ 75 #define SX9500_CLOSE_IRQ BIT(6) 76 #define SX9500_FAR_IRQ BIT(5) 77 #define SX9500_CONVDONE_IRQ BIT(3) 78 79 #define SX9500_PROXSTAT_SHIFT 4 80 #define SX9500_COMPSTAT_MASK GENMASK(3, 0) 81 82 #define SX9500_NUM_CHANNELS 4 83 #define SX9500_CHAN_MASK GENMASK(SX9500_NUM_CHANNELS - 1, 0) 84 85 struct sx9500_data { 86 struct mutex mutex; 87 struct i2c_client *client; 88 struct iio_trigger *trig; 89 struct regmap *regmap; 90 struct gpio_desc *gpiod_rst; 91 /* 92 * Last reading of the proximity status for each channel. We 93 * only send an event to user space when this changes. 94 */ 95 bool prox_stat[SX9500_NUM_CHANNELS]; 96 bool event_enabled[SX9500_NUM_CHANNELS]; 97 bool trigger_enabled; 98 u16 *buffer; 99 /* Remember enabled channels and sample rate during suspend. */ 100 unsigned int suspend_ctrl0; 101 struct completion completion; 102 int data_rdy_users, close_far_users; 103 int channel_users[SX9500_NUM_CHANNELS]; 104 }; 105 106 static const struct iio_event_spec sx9500_events[] = { 107 { 108 .type = IIO_EV_TYPE_THRESH, 109 .dir = IIO_EV_DIR_EITHER, 110 .mask_separate = BIT(IIO_EV_INFO_ENABLE), 111 }, 112 }; 113 114 #define SX9500_CHANNEL(idx) \ 115 { \ 116 .type = IIO_PROXIMITY, \ 117 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 118 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \ 119 .indexed = 1, \ 120 .channel = idx, \ 121 .event_spec = sx9500_events, \ 122 .num_event_specs = ARRAY_SIZE(sx9500_events), \ 123 .scan_index = idx, \ 124 .scan_type = { \ 125 .sign = 'u', \ 126 .realbits = 16, \ 127 .storagebits = 16, \ 128 .shift = 0, \ 129 }, \ 130 } 131 132 static const struct iio_chan_spec sx9500_channels[] = { 133 SX9500_CHANNEL(0), 134 SX9500_CHANNEL(1), 135 SX9500_CHANNEL(2), 136 SX9500_CHANNEL(3), 137 IIO_CHAN_SOFT_TIMESTAMP(4), 138 }; 139 140 static const struct { 141 int val; 142 int val2; 143 } sx9500_samp_freq_table[] = { 144 {33, 333333}, 145 {16, 666666}, 146 {11, 111111}, 147 {8, 333333}, 148 {6, 666666}, 149 {5, 0}, 150 {3, 333333}, 151 {2, 500000}, 152 }; 153 154 static const unsigned int sx9500_scan_period_table[] = { 155 30, 60, 90, 120, 150, 200, 300, 400, 156 }; 157 158 static const struct regmap_range sx9500_writable_reg_ranges[] = { 159 regmap_reg_range(SX9500_REG_IRQ_MSK, SX9500_REG_IRQ_MSK), 160 regmap_reg_range(SX9500_REG_PROX_CTRL0, SX9500_REG_PROX_CTRL8), 161 regmap_reg_range(SX9500_REG_SENSOR_SEL, SX9500_REG_SENSOR_SEL), 162 regmap_reg_range(SX9500_REG_OFFSET_MSB, SX9500_REG_OFFSET_LSB), 163 regmap_reg_range(SX9500_REG_RESET, SX9500_REG_RESET), 164 }; 165 166 static const struct regmap_access_table sx9500_writeable_regs = { 167 .yes_ranges = sx9500_writable_reg_ranges, 168 .n_yes_ranges = ARRAY_SIZE(sx9500_writable_reg_ranges), 169 }; 170 171 /* 172 * All allocated registers are readable, so we just list unallocated 173 * ones. 174 */ 175 static const struct regmap_range sx9500_non_readable_reg_ranges[] = { 176 regmap_reg_range(SX9500_REG_STAT + 1, SX9500_REG_STAT + 1), 177 regmap_reg_range(SX9500_REG_IRQ_MSK + 1, SX9500_REG_PROX_CTRL0 - 1), 178 regmap_reg_range(SX9500_REG_PROX_CTRL8 + 1, SX9500_REG_SENSOR_SEL - 1), 179 regmap_reg_range(SX9500_REG_OFFSET_LSB + 1, SX9500_REG_RESET - 1), 180 }; 181 182 static const struct regmap_access_table sx9500_readable_regs = { 183 .no_ranges = sx9500_non_readable_reg_ranges, 184 .n_no_ranges = ARRAY_SIZE(sx9500_non_readable_reg_ranges), 185 }; 186 187 static const struct regmap_range sx9500_volatile_reg_ranges[] = { 188 regmap_reg_range(SX9500_REG_IRQ_SRC, SX9500_REG_STAT), 189 regmap_reg_range(SX9500_REG_USE_MSB, SX9500_REG_OFFSET_LSB), 190 regmap_reg_range(SX9500_REG_RESET, SX9500_REG_RESET), 191 }; 192 193 static const struct regmap_access_table sx9500_volatile_regs = { 194 .yes_ranges = sx9500_volatile_reg_ranges, 195 .n_yes_ranges = ARRAY_SIZE(sx9500_volatile_reg_ranges), 196 }; 197 198 static const struct regmap_config sx9500_regmap_config = { 199 .reg_bits = 8, 200 .val_bits = 8, 201 202 .max_register = SX9500_REG_RESET, 203 .cache_type = REGCACHE_RBTREE, 204 205 .wr_table = &sx9500_writeable_regs, 206 .rd_table = &sx9500_readable_regs, 207 .volatile_table = &sx9500_volatile_regs, 208 }; 209 210 static int sx9500_inc_users(struct sx9500_data *data, int *counter, 211 unsigned int reg, unsigned int bitmask) 212 { 213 (*counter)++; 214 if (*counter != 1) 215 /* Bit is already active, nothing to do. */ 216 return 0; 217 218 return regmap_update_bits(data->regmap, reg, bitmask, bitmask); 219 } 220 221 static int sx9500_dec_users(struct sx9500_data *data, int *counter, 222 unsigned int reg, unsigned int bitmask) 223 { 224 (*counter)--; 225 if (*counter != 0) 226 /* There are more users, do not deactivate. */ 227 return 0; 228 229 return regmap_update_bits(data->regmap, reg, bitmask, 0); 230 } 231 232 static int sx9500_inc_chan_users(struct sx9500_data *data, int chan) 233 { 234 return sx9500_inc_users(data, &data->channel_users[chan], 235 SX9500_REG_PROX_CTRL0, BIT(chan)); 236 } 237 238 static int sx9500_dec_chan_users(struct sx9500_data *data, int chan) 239 { 240 return sx9500_dec_users(data, &data->channel_users[chan], 241 SX9500_REG_PROX_CTRL0, BIT(chan)); 242 } 243 244 static int sx9500_inc_data_rdy_users(struct sx9500_data *data) 245 { 246 return sx9500_inc_users(data, &data->data_rdy_users, 247 SX9500_REG_IRQ_MSK, SX9500_CONVDONE_IRQ); 248 } 249 250 static int sx9500_dec_data_rdy_users(struct sx9500_data *data) 251 { 252 return sx9500_dec_users(data, &data->data_rdy_users, 253 SX9500_REG_IRQ_MSK, SX9500_CONVDONE_IRQ); 254 } 255 256 static int sx9500_inc_close_far_users(struct sx9500_data *data) 257 { 258 return sx9500_inc_users(data, &data->close_far_users, 259 SX9500_REG_IRQ_MSK, 260 SX9500_CLOSE_IRQ | SX9500_FAR_IRQ); 261 } 262 263 static int sx9500_dec_close_far_users(struct sx9500_data *data) 264 { 265 return sx9500_dec_users(data, &data->close_far_users, 266 SX9500_REG_IRQ_MSK, 267 SX9500_CLOSE_IRQ | SX9500_FAR_IRQ); 268 } 269 270 static int sx9500_read_prox_data(struct sx9500_data *data, 271 const struct iio_chan_spec *chan, 272 int *val) 273 { 274 int ret; 275 __be16 regval; 276 277 ret = regmap_write(data->regmap, SX9500_REG_SENSOR_SEL, chan->channel); 278 if (ret < 0) 279 return ret; 280 281 ret = regmap_bulk_read(data->regmap, SX9500_REG_USE_MSB, ®val, 2); 282 if (ret < 0) 283 return ret; 284 285 *val = be16_to_cpu(regval); 286 287 return IIO_VAL_INT; 288 } 289 290 /* 291 * If we have no interrupt support, we have to wait for a scan period 292 * after enabling a channel to get a result. 293 */ 294 static int sx9500_wait_for_sample(struct sx9500_data *data) 295 { 296 int ret; 297 unsigned int val; 298 299 ret = regmap_read(data->regmap, SX9500_REG_PROX_CTRL0, &val); 300 if (ret < 0) 301 return ret; 302 303 val = (val & SX9500_SCAN_PERIOD_MASK) >> SX9500_SCAN_PERIOD_SHIFT; 304 305 msleep(sx9500_scan_period_table[val]); 306 307 return 0; 308 } 309 310 static int sx9500_read_proximity(struct sx9500_data *data, 311 const struct iio_chan_spec *chan, 312 int *val) 313 { 314 int ret; 315 316 mutex_lock(&data->mutex); 317 318 ret = sx9500_inc_chan_users(data, chan->channel); 319 if (ret < 0) 320 goto out; 321 322 ret = sx9500_inc_data_rdy_users(data); 323 if (ret < 0) 324 goto out_dec_chan; 325 326 mutex_unlock(&data->mutex); 327 328 if (data->client->irq > 0) 329 ret = wait_for_completion_interruptible(&data->completion); 330 else 331 ret = sx9500_wait_for_sample(data); 332 333 mutex_lock(&data->mutex); 334 335 if (ret < 0) 336 goto out_dec_data_rdy; 337 338 ret = sx9500_read_prox_data(data, chan, val); 339 if (ret < 0) 340 goto out_dec_data_rdy; 341 342 ret = sx9500_dec_data_rdy_users(data); 343 if (ret < 0) 344 goto out_dec_chan; 345 346 ret = sx9500_dec_chan_users(data, chan->channel); 347 if (ret < 0) 348 goto out; 349 350 ret = IIO_VAL_INT; 351 352 goto out; 353 354 out_dec_data_rdy: 355 sx9500_dec_data_rdy_users(data); 356 out_dec_chan: 357 sx9500_dec_chan_users(data, chan->channel); 358 out: 359 mutex_unlock(&data->mutex); 360 reinit_completion(&data->completion); 361 362 return ret; 363 } 364 365 static int sx9500_read_samp_freq(struct sx9500_data *data, 366 int *val, int *val2) 367 { 368 int ret; 369 unsigned int regval; 370 371 mutex_lock(&data->mutex); 372 ret = regmap_read(data->regmap, SX9500_REG_PROX_CTRL0, ®val); 373 mutex_unlock(&data->mutex); 374 375 if (ret < 0) 376 return ret; 377 378 regval = (regval & SX9500_SCAN_PERIOD_MASK) >> SX9500_SCAN_PERIOD_SHIFT; 379 *val = sx9500_samp_freq_table[regval].val; 380 *val2 = sx9500_samp_freq_table[regval].val2; 381 382 return IIO_VAL_INT_PLUS_MICRO; 383 } 384 385 static int sx9500_read_raw(struct iio_dev *indio_dev, 386 const struct iio_chan_spec *chan, 387 int *val, int *val2, long mask) 388 { 389 struct sx9500_data *data = iio_priv(indio_dev); 390 int ret; 391 392 switch (chan->type) { 393 case IIO_PROXIMITY: 394 switch (mask) { 395 case IIO_CHAN_INFO_RAW: 396 ret = iio_device_claim_direct_mode(indio_dev); 397 if (ret) 398 return ret; 399 ret = sx9500_read_proximity(data, chan, val); 400 iio_device_release_direct_mode(indio_dev); 401 return ret; 402 case IIO_CHAN_INFO_SAMP_FREQ: 403 return sx9500_read_samp_freq(data, val, val2); 404 default: 405 return -EINVAL; 406 } 407 default: 408 return -EINVAL; 409 } 410 } 411 412 static int sx9500_set_samp_freq(struct sx9500_data *data, 413 int val, int val2) 414 { 415 int i, ret; 416 417 for (i = 0; i < ARRAY_SIZE(sx9500_samp_freq_table); i++) 418 if (val == sx9500_samp_freq_table[i].val && 419 val2 == sx9500_samp_freq_table[i].val2) 420 break; 421 422 if (i == ARRAY_SIZE(sx9500_samp_freq_table)) 423 return -EINVAL; 424 425 mutex_lock(&data->mutex); 426 427 ret = regmap_update_bits(data->regmap, SX9500_REG_PROX_CTRL0, 428 SX9500_SCAN_PERIOD_MASK, 429 i << SX9500_SCAN_PERIOD_SHIFT); 430 431 mutex_unlock(&data->mutex); 432 433 return ret; 434 } 435 436 static int sx9500_write_raw(struct iio_dev *indio_dev, 437 const struct iio_chan_spec *chan, 438 int val, int val2, long mask) 439 { 440 struct sx9500_data *data = iio_priv(indio_dev); 441 442 switch (chan->type) { 443 case IIO_PROXIMITY: 444 switch (mask) { 445 case IIO_CHAN_INFO_SAMP_FREQ: 446 return sx9500_set_samp_freq(data, val, val2); 447 default: 448 return -EINVAL; 449 } 450 default: 451 return -EINVAL; 452 } 453 } 454 455 static irqreturn_t sx9500_irq_handler(int irq, void *private) 456 { 457 struct iio_dev *indio_dev = private; 458 struct sx9500_data *data = iio_priv(indio_dev); 459 460 if (data->trigger_enabled) 461 iio_trigger_poll(data->trig); 462 463 /* 464 * Even if no event is enabled, we need to wake the thread to 465 * clear the interrupt state by reading SX9500_REG_IRQ_SRC. It 466 * is not possible to do that here because regmap_read takes a 467 * mutex. 468 */ 469 return IRQ_WAKE_THREAD; 470 } 471 472 static void sx9500_push_events(struct iio_dev *indio_dev) 473 { 474 int ret; 475 unsigned int val, chan; 476 struct sx9500_data *data = iio_priv(indio_dev); 477 478 ret = regmap_read(data->regmap, SX9500_REG_STAT, &val); 479 if (ret < 0) { 480 dev_err(&data->client->dev, "i2c transfer error in irq\n"); 481 return; 482 } 483 484 val >>= SX9500_PROXSTAT_SHIFT; 485 for (chan = 0; chan < SX9500_NUM_CHANNELS; chan++) { 486 int dir; 487 u64 ev; 488 bool new_prox = val & BIT(chan); 489 490 if (!data->event_enabled[chan]) 491 continue; 492 if (new_prox == data->prox_stat[chan]) 493 /* No change on this channel. */ 494 continue; 495 496 dir = new_prox ? IIO_EV_DIR_FALLING : IIO_EV_DIR_RISING; 497 ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, chan, 498 IIO_EV_TYPE_THRESH, dir); 499 iio_push_event(indio_dev, ev, iio_get_time_ns(indio_dev)); 500 data->prox_stat[chan] = new_prox; 501 } 502 } 503 504 static irqreturn_t sx9500_irq_thread_handler(int irq, void *private) 505 { 506 struct iio_dev *indio_dev = private; 507 struct sx9500_data *data = iio_priv(indio_dev); 508 int ret; 509 unsigned int val; 510 511 mutex_lock(&data->mutex); 512 513 ret = regmap_read(data->regmap, SX9500_REG_IRQ_SRC, &val); 514 if (ret < 0) { 515 dev_err(&data->client->dev, "i2c transfer error in irq\n"); 516 goto out; 517 } 518 519 if (val & (SX9500_CLOSE_IRQ | SX9500_FAR_IRQ)) 520 sx9500_push_events(indio_dev); 521 522 if (val & SX9500_CONVDONE_IRQ) 523 complete(&data->completion); 524 525 out: 526 mutex_unlock(&data->mutex); 527 528 return IRQ_HANDLED; 529 } 530 531 static int sx9500_read_event_config(struct iio_dev *indio_dev, 532 const struct iio_chan_spec *chan, 533 enum iio_event_type type, 534 enum iio_event_direction dir) 535 { 536 struct sx9500_data *data = iio_priv(indio_dev); 537 538 if (chan->type != IIO_PROXIMITY || type != IIO_EV_TYPE_THRESH || 539 dir != IIO_EV_DIR_EITHER) 540 return -EINVAL; 541 542 return data->event_enabled[chan->channel]; 543 } 544 545 static int sx9500_write_event_config(struct iio_dev *indio_dev, 546 const struct iio_chan_spec *chan, 547 enum iio_event_type type, 548 enum iio_event_direction dir, 549 int state) 550 { 551 struct sx9500_data *data = iio_priv(indio_dev); 552 int ret; 553 554 if (chan->type != IIO_PROXIMITY || type != IIO_EV_TYPE_THRESH || 555 dir != IIO_EV_DIR_EITHER) 556 return -EINVAL; 557 558 mutex_lock(&data->mutex); 559 560 if (state == 1) { 561 ret = sx9500_inc_chan_users(data, chan->channel); 562 if (ret < 0) 563 goto out_unlock; 564 ret = sx9500_inc_close_far_users(data); 565 if (ret < 0) 566 goto out_undo_chan; 567 } else { 568 ret = sx9500_dec_chan_users(data, chan->channel); 569 if (ret < 0) 570 goto out_unlock; 571 ret = sx9500_dec_close_far_users(data); 572 if (ret < 0) 573 goto out_undo_chan; 574 } 575 576 data->event_enabled[chan->channel] = state; 577 goto out_unlock; 578 579 out_undo_chan: 580 if (state == 1) 581 sx9500_dec_chan_users(data, chan->channel); 582 else 583 sx9500_inc_chan_users(data, chan->channel); 584 out_unlock: 585 mutex_unlock(&data->mutex); 586 return ret; 587 } 588 589 static int sx9500_update_scan_mode(struct iio_dev *indio_dev, 590 const unsigned long *scan_mask) 591 { 592 struct sx9500_data *data = iio_priv(indio_dev); 593 594 mutex_lock(&data->mutex); 595 kfree(data->buffer); 596 data->buffer = kzalloc(indio_dev->scan_bytes, GFP_KERNEL); 597 mutex_unlock(&data->mutex); 598 599 if (data->buffer == NULL) 600 return -ENOMEM; 601 602 return 0; 603 } 604 605 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL( 606 "2.500000 3.333333 5 6.666666 8.333333 11.111111 16.666666 33.333333"); 607 608 static struct attribute *sx9500_attributes[] = { 609 &iio_const_attr_sampling_frequency_available.dev_attr.attr, 610 NULL, 611 }; 612 613 static const struct attribute_group sx9500_attribute_group = { 614 .attrs = sx9500_attributes, 615 }; 616 617 static const struct iio_info sx9500_info = { 618 .attrs = &sx9500_attribute_group, 619 .read_raw = &sx9500_read_raw, 620 .write_raw = &sx9500_write_raw, 621 .read_event_config = &sx9500_read_event_config, 622 .write_event_config = &sx9500_write_event_config, 623 .update_scan_mode = &sx9500_update_scan_mode, 624 }; 625 626 static int sx9500_set_trigger_state(struct iio_trigger *trig, 627 bool state) 628 { 629 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); 630 struct sx9500_data *data = iio_priv(indio_dev); 631 int ret; 632 633 mutex_lock(&data->mutex); 634 635 if (state) 636 ret = sx9500_inc_data_rdy_users(data); 637 else 638 ret = sx9500_dec_data_rdy_users(data); 639 if (ret < 0) 640 goto out; 641 642 data->trigger_enabled = state; 643 644 out: 645 mutex_unlock(&data->mutex); 646 647 return ret; 648 } 649 650 static const struct iio_trigger_ops sx9500_trigger_ops = { 651 .set_trigger_state = sx9500_set_trigger_state, 652 }; 653 654 static irqreturn_t sx9500_trigger_handler(int irq, void *private) 655 { 656 struct iio_poll_func *pf = private; 657 struct iio_dev *indio_dev = pf->indio_dev; 658 struct sx9500_data *data = iio_priv(indio_dev); 659 int val, bit, ret, i = 0; 660 661 mutex_lock(&data->mutex); 662 663 for_each_set_bit(bit, indio_dev->active_scan_mask, 664 indio_dev->masklength) { 665 ret = sx9500_read_prox_data(data, &indio_dev->channels[bit], 666 &val); 667 if (ret < 0) 668 goto out; 669 670 data->buffer[i++] = val; 671 } 672 673 iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, 674 iio_get_time_ns(indio_dev)); 675 676 out: 677 mutex_unlock(&data->mutex); 678 679 iio_trigger_notify_done(indio_dev->trig); 680 681 return IRQ_HANDLED; 682 } 683 684 static int sx9500_buffer_preenable(struct iio_dev *indio_dev) 685 { 686 struct sx9500_data *data = iio_priv(indio_dev); 687 int ret = 0, i; 688 689 mutex_lock(&data->mutex); 690 691 for (i = 0; i < SX9500_NUM_CHANNELS; i++) 692 if (test_bit(i, indio_dev->active_scan_mask)) { 693 ret = sx9500_inc_chan_users(data, i); 694 if (ret) 695 break; 696 } 697 698 if (ret) 699 for (i = i - 1; i >= 0; i--) 700 if (test_bit(i, indio_dev->active_scan_mask)) 701 sx9500_dec_chan_users(data, i); 702 703 mutex_unlock(&data->mutex); 704 705 return ret; 706 } 707 708 static int sx9500_buffer_predisable(struct iio_dev *indio_dev) 709 { 710 struct sx9500_data *data = iio_priv(indio_dev); 711 int ret = 0, i; 712 713 iio_triggered_buffer_predisable(indio_dev); 714 715 mutex_lock(&data->mutex); 716 717 for (i = 0; i < SX9500_NUM_CHANNELS; i++) 718 if (test_bit(i, indio_dev->active_scan_mask)) { 719 ret = sx9500_dec_chan_users(data, i); 720 if (ret) 721 break; 722 } 723 724 if (ret) 725 for (i = i - 1; i >= 0; i--) 726 if (test_bit(i, indio_dev->active_scan_mask)) 727 sx9500_inc_chan_users(data, i); 728 729 mutex_unlock(&data->mutex); 730 731 return ret; 732 } 733 734 static const struct iio_buffer_setup_ops sx9500_buffer_setup_ops = { 735 .preenable = sx9500_buffer_preenable, 736 .postenable = iio_triggered_buffer_postenable, 737 .predisable = sx9500_buffer_predisable, 738 }; 739 740 struct sx9500_reg_default { 741 u8 reg; 742 u8 def; 743 }; 744 745 static const struct sx9500_reg_default sx9500_default_regs[] = { 746 { 747 .reg = SX9500_REG_PROX_CTRL1, 748 /* Shield enabled, small range. */ 749 .def = 0x43, 750 }, 751 { 752 .reg = SX9500_REG_PROX_CTRL2, 753 /* x8 gain, 167kHz frequency, finest resolution. */ 754 .def = 0x77, 755 }, 756 { 757 .reg = SX9500_REG_PROX_CTRL3, 758 /* Doze enabled, 2x scan period doze, no raw filter. */ 759 .def = 0x40, 760 }, 761 { 762 .reg = SX9500_REG_PROX_CTRL4, 763 /* Average threshold. */ 764 .def = 0x30, 765 }, 766 { 767 .reg = SX9500_REG_PROX_CTRL5, 768 /* 769 * Debouncer off, lowest average negative filter, 770 * highest average postive filter. 771 */ 772 .def = 0x0f, 773 }, 774 { 775 .reg = SX9500_REG_PROX_CTRL6, 776 /* Proximity detection threshold: 280 */ 777 .def = 0x0e, 778 }, 779 { 780 .reg = SX9500_REG_PROX_CTRL7, 781 /* 782 * No automatic compensation, compensate each pin 783 * independently, proximity hysteresis: 32, close 784 * debouncer off, far debouncer off. 785 */ 786 .def = 0x00, 787 }, 788 { 789 .reg = SX9500_REG_PROX_CTRL8, 790 /* No stuck timeout, no periodic compensation. */ 791 .def = 0x00, 792 }, 793 { 794 .reg = SX9500_REG_PROX_CTRL0, 795 /* Scan period: 30ms, all sensors disabled. */ 796 .def = 0x00, 797 }, 798 }; 799 800 /* Activate all channels and perform an initial compensation. */ 801 static int sx9500_init_compensation(struct iio_dev *indio_dev) 802 { 803 struct sx9500_data *data = iio_priv(indio_dev); 804 int i, ret; 805 unsigned int val; 806 807 ret = regmap_update_bits(data->regmap, SX9500_REG_PROX_CTRL0, 808 SX9500_CHAN_MASK, SX9500_CHAN_MASK); 809 if (ret < 0) 810 return ret; 811 812 for (i = 10; i >= 0; i--) { 813 usleep_range(10000, 20000); 814 ret = regmap_read(data->regmap, SX9500_REG_STAT, &val); 815 if (ret < 0) 816 goto out; 817 if (!(val & SX9500_COMPSTAT_MASK)) 818 break; 819 } 820 821 if (i < 0) { 822 dev_err(&data->client->dev, "initial compensation timed out"); 823 ret = -ETIMEDOUT; 824 } 825 826 out: 827 regmap_update_bits(data->regmap, SX9500_REG_PROX_CTRL0, 828 SX9500_CHAN_MASK, 0); 829 return ret; 830 } 831 832 static int sx9500_init_device(struct iio_dev *indio_dev) 833 { 834 struct sx9500_data *data = iio_priv(indio_dev); 835 int ret, i; 836 unsigned int val; 837 838 if (data->gpiod_rst) { 839 gpiod_set_value_cansleep(data->gpiod_rst, 0); 840 usleep_range(1000, 2000); 841 gpiod_set_value_cansleep(data->gpiod_rst, 1); 842 usleep_range(1000, 2000); 843 } 844 845 ret = regmap_write(data->regmap, SX9500_REG_IRQ_MSK, 0); 846 if (ret < 0) 847 return ret; 848 849 ret = regmap_write(data->regmap, SX9500_REG_RESET, 850 SX9500_SOFT_RESET); 851 if (ret < 0) 852 return ret; 853 854 ret = regmap_read(data->regmap, SX9500_REG_IRQ_SRC, &val); 855 if (ret < 0) 856 return ret; 857 858 for (i = 0; i < ARRAY_SIZE(sx9500_default_regs); i++) { 859 ret = regmap_write(data->regmap, 860 sx9500_default_regs[i].reg, 861 sx9500_default_regs[i].def); 862 if (ret < 0) 863 return ret; 864 } 865 866 return sx9500_init_compensation(indio_dev); 867 } 868 869 static void sx9500_gpio_probe(struct i2c_client *client, 870 struct sx9500_data *data) 871 { 872 struct device *dev; 873 874 if (!client) 875 return; 876 877 dev = &client->dev; 878 879 data->gpiod_rst = devm_gpiod_get(dev, SX9500_GPIO_RESET, GPIOD_OUT_HIGH); 880 if (IS_ERR(data->gpiod_rst)) { 881 dev_warn(dev, "gpio get reset pin failed\n"); 882 data->gpiod_rst = NULL; 883 } 884 } 885 886 static int sx9500_probe(struct i2c_client *client, 887 const struct i2c_device_id *id) 888 { 889 int ret; 890 struct iio_dev *indio_dev; 891 struct sx9500_data *data; 892 893 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); 894 if (indio_dev == NULL) 895 return -ENOMEM; 896 897 data = iio_priv(indio_dev); 898 data->client = client; 899 mutex_init(&data->mutex); 900 init_completion(&data->completion); 901 data->trigger_enabled = false; 902 903 data->regmap = devm_regmap_init_i2c(client, &sx9500_regmap_config); 904 if (IS_ERR(data->regmap)) 905 return PTR_ERR(data->regmap); 906 907 indio_dev->dev.parent = &client->dev; 908 indio_dev->name = SX9500_DRIVER_NAME; 909 indio_dev->channels = sx9500_channels; 910 indio_dev->num_channels = ARRAY_SIZE(sx9500_channels); 911 indio_dev->info = &sx9500_info; 912 indio_dev->modes = INDIO_DIRECT_MODE; 913 i2c_set_clientdata(client, indio_dev); 914 915 sx9500_gpio_probe(client, data); 916 917 ret = sx9500_init_device(indio_dev); 918 if (ret < 0) 919 return ret; 920 921 if (client->irq <= 0) 922 dev_warn(&client->dev, "no valid irq found\n"); 923 else { 924 ret = devm_request_threaded_irq(&client->dev, client->irq, 925 sx9500_irq_handler, sx9500_irq_thread_handler, 926 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 927 SX9500_IRQ_NAME, indio_dev); 928 if (ret < 0) 929 return ret; 930 931 data->trig = devm_iio_trigger_alloc(&client->dev, 932 "%s-dev%d", indio_dev->name, indio_dev->id); 933 if (!data->trig) 934 return -ENOMEM; 935 936 data->trig->dev.parent = &client->dev; 937 data->trig->ops = &sx9500_trigger_ops; 938 iio_trigger_set_drvdata(data->trig, indio_dev); 939 940 ret = iio_trigger_register(data->trig); 941 if (ret) 942 return ret; 943 } 944 945 ret = iio_triggered_buffer_setup(indio_dev, NULL, 946 sx9500_trigger_handler, 947 &sx9500_buffer_setup_ops); 948 if (ret < 0) 949 goto out_trigger_unregister; 950 951 ret = iio_device_register(indio_dev); 952 if (ret < 0) 953 goto out_buffer_cleanup; 954 955 return 0; 956 957 out_buffer_cleanup: 958 iio_triggered_buffer_cleanup(indio_dev); 959 out_trigger_unregister: 960 if (client->irq > 0) 961 iio_trigger_unregister(data->trig); 962 963 return ret; 964 } 965 966 static int sx9500_remove(struct i2c_client *client) 967 { 968 struct iio_dev *indio_dev = i2c_get_clientdata(client); 969 struct sx9500_data *data = iio_priv(indio_dev); 970 971 iio_device_unregister(indio_dev); 972 iio_triggered_buffer_cleanup(indio_dev); 973 if (client->irq > 0) 974 iio_trigger_unregister(data->trig); 975 kfree(data->buffer); 976 977 return 0; 978 } 979 980 #ifdef CONFIG_PM_SLEEP 981 static int sx9500_suspend(struct device *dev) 982 { 983 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 984 struct sx9500_data *data = iio_priv(indio_dev); 985 int ret; 986 987 mutex_lock(&data->mutex); 988 ret = regmap_read(data->regmap, SX9500_REG_PROX_CTRL0, 989 &data->suspend_ctrl0); 990 if (ret < 0) 991 goto out; 992 993 /* 994 * Scan period doesn't matter because when all the sensors are 995 * deactivated the device is in sleep mode. 996 */ 997 ret = regmap_write(data->regmap, SX9500_REG_PROX_CTRL0, 0); 998 999 out: 1000 mutex_unlock(&data->mutex); 1001 return ret; 1002 } 1003 1004 static int sx9500_resume(struct device *dev) 1005 { 1006 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 1007 struct sx9500_data *data = iio_priv(indio_dev); 1008 int ret; 1009 1010 mutex_lock(&data->mutex); 1011 ret = regmap_write(data->regmap, SX9500_REG_PROX_CTRL0, 1012 data->suspend_ctrl0); 1013 mutex_unlock(&data->mutex); 1014 1015 return ret; 1016 } 1017 #endif /* CONFIG_PM_SLEEP */ 1018 1019 static const struct dev_pm_ops sx9500_pm_ops = { 1020 SET_SYSTEM_SLEEP_PM_OPS(sx9500_suspend, sx9500_resume) 1021 }; 1022 1023 static const struct acpi_device_id sx9500_acpi_match[] = { 1024 {"SSX9500", 0}, 1025 { }, 1026 }; 1027 MODULE_DEVICE_TABLE(acpi, sx9500_acpi_match); 1028 1029 static const struct of_device_id sx9500_of_match[] = { 1030 { .compatible = "semtech,sx9500", }, 1031 { } 1032 }; 1033 MODULE_DEVICE_TABLE(of, sx9500_of_match); 1034 1035 static const struct i2c_device_id sx9500_id[] = { 1036 {"sx9500", 0}, 1037 { }, 1038 }; 1039 MODULE_DEVICE_TABLE(i2c, sx9500_id); 1040 1041 static struct i2c_driver sx9500_driver = { 1042 .driver = { 1043 .name = SX9500_DRIVER_NAME, 1044 .acpi_match_table = ACPI_PTR(sx9500_acpi_match), 1045 .of_match_table = of_match_ptr(sx9500_of_match), 1046 .pm = &sx9500_pm_ops, 1047 }, 1048 .probe = sx9500_probe, 1049 .remove = sx9500_remove, 1050 .id_table = sx9500_id, 1051 }; 1052 module_i2c_driver(sx9500_driver); 1053 1054 MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>"); 1055 MODULE_DESCRIPTION("Driver for Semtech SX9500 proximity sensor"); 1056 MODULE_LICENSE("GPL v2"); 1057