1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * iio/adc/ad799x.c 4 * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc. 5 * 6 * based on iio/adc/max1363 7 * Copyright (C) 2008-2010 Jonathan Cameron 8 * 9 * based on linux/drivers/i2c/chips/max123x 10 * Copyright (C) 2002-2004 Stefan Eletzhofer 11 * 12 * based on linux/drivers/acron/char/pcf8583.c 13 * Copyright (C) 2000 Russell King 14 * 15 * ad799x.c 16 * 17 * Support for ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997, 18 * ad7998 and similar chips. 19 */ 20 21 #include <linux/interrupt.h> 22 #include <linux/device.h> 23 #include <linux/kernel.h> 24 #include <linux/sysfs.h> 25 #include <linux/i2c.h> 26 #include <linux/regulator/consumer.h> 27 #include <linux/slab.h> 28 #include <linux/types.h> 29 #include <linux/err.h> 30 #include <linux/module.h> 31 #include <linux/mutex.h> 32 #include <linux/bitops.h> 33 34 #include <linux/iio/iio.h> 35 #include <linux/iio/sysfs.h> 36 #include <linux/iio/events.h> 37 #include <linux/iio/buffer.h> 38 #include <linux/iio/trigger_consumer.h> 39 #include <linux/iio/triggered_buffer.h> 40 41 #define AD799X_CHANNEL_SHIFT 4 42 43 /* 44 * AD7991, AD7995 and AD7999 defines 45 */ 46 47 #define AD7991_REF_SEL 0x08 48 #define AD7991_FLTR 0x04 49 #define AD7991_BIT_TRIAL_DELAY 0x02 50 #define AD7991_SAMPLE_DELAY 0x01 51 52 /* 53 * AD7992, AD7993, AD7994, AD7997 and AD7998 defines 54 */ 55 56 #define AD7998_FLTR BIT(3) 57 #define AD7998_ALERT_EN BIT(2) 58 #define AD7998_BUSY_ALERT BIT(1) 59 #define AD7998_BUSY_ALERT_POL BIT(0) 60 61 #define AD7998_CONV_RES_REG 0x0 62 #define AD7998_ALERT_STAT_REG 0x1 63 #define AD7998_CONF_REG 0x2 64 #define AD7998_CYCLE_TMR_REG 0x3 65 66 #define AD7998_DATALOW_REG(x) ((x) * 3 + 0x4) 67 #define AD7998_DATAHIGH_REG(x) ((x) * 3 + 0x5) 68 #define AD7998_HYST_REG(x) ((x) * 3 + 0x6) 69 70 #define AD7998_CYC_MASK GENMASK(2, 0) 71 #define AD7998_CYC_DIS 0x0 72 #define AD7998_CYC_TCONF_32 0x1 73 #define AD7998_CYC_TCONF_64 0x2 74 #define AD7998_CYC_TCONF_128 0x3 75 #define AD7998_CYC_TCONF_256 0x4 76 #define AD7998_CYC_TCONF_512 0x5 77 #define AD7998_CYC_TCONF_1024 0x6 78 #define AD7998_CYC_TCONF_2048 0x7 79 80 #define AD7998_ALERT_STAT_CLEAR 0xFF 81 82 /* 83 * AD7997 and AD7997 defines 84 */ 85 86 #define AD7997_8_READ_SINGLE BIT(7) 87 #define AD7997_8_READ_SEQUENCE (BIT(6) | BIT(5) | BIT(4)) 88 89 enum { 90 ad7991, 91 ad7995, 92 ad7999, 93 ad7992, 94 ad7993, 95 ad7994, 96 ad7997, 97 ad7998 98 }; 99 100 /** 101 * struct ad799x_chip_config - chip specific information 102 * @channel: channel specification 103 * @default_config: device default configuration 104 * @info: pointer to iio_info struct 105 */ 106 struct ad799x_chip_config { 107 const struct iio_chan_spec channel[9]; 108 u16 default_config; 109 const struct iio_info *info; 110 }; 111 112 /** 113 * struct ad799x_chip_info - chip specific information 114 * @num_channels: number of channels 115 * @noirq_config: device configuration w/o IRQ 116 * @irq_config: device configuration w/IRQ 117 */ 118 struct ad799x_chip_info { 119 int num_channels; 120 const struct ad799x_chip_config noirq_config; 121 const struct ad799x_chip_config irq_config; 122 }; 123 124 struct ad799x_state { 125 struct i2c_client *client; 126 const struct ad799x_chip_config *chip_config; 127 struct regulator *reg; 128 struct regulator *vref; 129 /* lock to protect against multiple access to the device */ 130 struct mutex lock; 131 unsigned int id; 132 u16 config; 133 134 u8 *rx_buf; 135 unsigned int transfer_size; 136 }; 137 138 static int ad799x_write_config(struct ad799x_state *st, u16 val) 139 { 140 switch (st->id) { 141 case ad7997: 142 case ad7998: 143 return i2c_smbus_write_word_swapped(st->client, AD7998_CONF_REG, 144 val); 145 case ad7992: 146 case ad7993: 147 case ad7994: 148 return i2c_smbus_write_byte_data(st->client, AD7998_CONF_REG, 149 val); 150 default: 151 /* Will be written when doing a conversion */ 152 st->config = val; 153 return 0; 154 } 155 } 156 157 static int ad799x_read_config(struct ad799x_state *st) 158 { 159 switch (st->id) { 160 case ad7997: 161 case ad7998: 162 return i2c_smbus_read_word_swapped(st->client, AD7998_CONF_REG); 163 case ad7992: 164 case ad7993: 165 case ad7994: 166 return i2c_smbus_read_byte_data(st->client, AD7998_CONF_REG); 167 default: 168 /* No readback support */ 169 return st->config; 170 } 171 } 172 173 static int ad799x_update_config(struct ad799x_state *st, u16 config) 174 { 175 int ret; 176 177 ret = ad799x_write_config(st, config); 178 if (ret < 0) 179 return ret; 180 ret = ad799x_read_config(st); 181 if (ret < 0) 182 return ret; 183 st->config = ret; 184 185 return 0; 186 } 187 188 static irqreturn_t ad799x_trigger_handler(int irq, void *p) 189 { 190 struct iio_poll_func *pf = p; 191 struct iio_dev *indio_dev = pf->indio_dev; 192 struct ad799x_state *st = iio_priv(indio_dev); 193 int b_sent; 194 u8 cmd; 195 196 switch (st->id) { 197 case ad7991: 198 case ad7995: 199 case ad7999: 200 cmd = st->config | 201 (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT); 202 break; 203 case ad7992: 204 case ad7993: 205 case ad7994: 206 cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) | 207 AD7998_CONV_RES_REG; 208 break; 209 case ad7997: 210 case ad7998: 211 cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG; 212 break; 213 default: 214 cmd = 0; 215 } 216 217 b_sent = i2c_smbus_read_i2c_block_data(st->client, 218 cmd, st->transfer_size, st->rx_buf); 219 if (b_sent < 0) 220 goto out; 221 222 iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf, 223 iio_get_time_ns(indio_dev)); 224 out: 225 iio_trigger_notify_done(indio_dev->trig); 226 227 return IRQ_HANDLED; 228 } 229 230 static int ad799x_update_scan_mode(struct iio_dev *indio_dev, 231 const unsigned long *scan_mask) 232 { 233 struct ad799x_state *st = iio_priv(indio_dev); 234 235 kfree(st->rx_buf); 236 st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL); 237 if (!st->rx_buf) 238 return -ENOMEM; 239 240 st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2; 241 242 switch (st->id) { 243 case ad7992: 244 case ad7993: 245 case ad7994: 246 case ad7997: 247 case ad7998: 248 st->config &= ~(GENMASK(7, 0) << AD799X_CHANNEL_SHIFT); 249 st->config |= (*scan_mask << AD799X_CHANNEL_SHIFT); 250 return ad799x_write_config(st, st->config); 251 default: 252 return 0; 253 } 254 } 255 256 static int ad799x_scan_direct(struct ad799x_state *st, unsigned int ch) 257 { 258 u8 cmd; 259 260 switch (st->id) { 261 case ad7991: 262 case ad7995: 263 case ad7999: 264 cmd = st->config | (BIT(ch) << AD799X_CHANNEL_SHIFT); 265 break; 266 case ad7992: 267 case ad7993: 268 case ad7994: 269 cmd = BIT(ch) << AD799X_CHANNEL_SHIFT; 270 break; 271 case ad7997: 272 case ad7998: 273 cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE; 274 break; 275 default: 276 return -EINVAL; 277 } 278 279 return i2c_smbus_read_word_swapped(st->client, cmd); 280 } 281 282 static int ad799x_read_raw(struct iio_dev *indio_dev, 283 struct iio_chan_spec const *chan, 284 int *val, 285 int *val2, 286 long m) 287 { 288 int ret; 289 struct ad799x_state *st = iio_priv(indio_dev); 290 291 switch (m) { 292 case IIO_CHAN_INFO_RAW: 293 ret = iio_device_claim_direct_mode(indio_dev); 294 if (ret) 295 return ret; 296 mutex_lock(&st->lock); 297 ret = ad799x_scan_direct(st, chan->scan_index); 298 mutex_unlock(&st->lock); 299 iio_device_release_direct_mode(indio_dev); 300 301 if (ret < 0) 302 return ret; 303 *val = (ret >> chan->scan_type.shift) & 304 GENMASK(chan->scan_type.realbits - 1, 0); 305 return IIO_VAL_INT; 306 case IIO_CHAN_INFO_SCALE: 307 if (st->vref) 308 ret = regulator_get_voltage(st->vref); 309 else 310 ret = regulator_get_voltage(st->reg); 311 312 if (ret < 0) 313 return ret; 314 *val = ret / 1000; 315 *val2 = chan->scan_type.realbits; 316 return IIO_VAL_FRACTIONAL_LOG2; 317 } 318 return -EINVAL; 319 } 320 static const unsigned int ad7998_frequencies[] = { 321 [AD7998_CYC_DIS] = 0, 322 [AD7998_CYC_TCONF_32] = 15625, 323 [AD7998_CYC_TCONF_64] = 7812, 324 [AD7998_CYC_TCONF_128] = 3906, 325 [AD7998_CYC_TCONF_512] = 976, 326 [AD7998_CYC_TCONF_1024] = 488, 327 [AD7998_CYC_TCONF_2048] = 244, 328 }; 329 330 static ssize_t ad799x_read_frequency(struct device *dev, 331 struct device_attribute *attr, 332 char *buf) 333 { 334 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 335 struct ad799x_state *st = iio_priv(indio_dev); 336 337 int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG); 338 339 if (ret < 0) 340 return ret; 341 342 return sprintf(buf, "%u\n", ad7998_frequencies[ret & AD7998_CYC_MASK]); 343 } 344 345 static ssize_t ad799x_write_frequency(struct device *dev, 346 struct device_attribute *attr, 347 const char *buf, 348 size_t len) 349 { 350 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 351 struct ad799x_state *st = iio_priv(indio_dev); 352 353 long val; 354 int ret, i; 355 356 ret = kstrtol(buf, 10, &val); 357 if (ret) 358 return ret; 359 360 mutex_lock(&st->lock); 361 362 ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG); 363 if (ret < 0) 364 goto error_ret_mutex; 365 /* Wipe the bits clean */ 366 ret &= ~AD7998_CYC_MASK; 367 368 for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++) 369 if (val == ad7998_frequencies[i]) 370 break; 371 if (i == ARRAY_SIZE(ad7998_frequencies)) { 372 ret = -EINVAL; 373 goto error_ret_mutex; 374 } 375 376 ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG, 377 ret | i); 378 if (ret < 0) 379 goto error_ret_mutex; 380 ret = len; 381 382 error_ret_mutex: 383 mutex_unlock(&st->lock); 384 385 return ret; 386 } 387 388 static int ad799x_read_event_config(struct iio_dev *indio_dev, 389 const struct iio_chan_spec *chan, 390 enum iio_event_type type, 391 enum iio_event_direction dir) 392 { 393 struct ad799x_state *st = iio_priv(indio_dev); 394 395 if (!(st->config & AD7998_ALERT_EN)) 396 return 0; 397 398 if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index)) 399 return 1; 400 401 return 0; 402 } 403 404 static int ad799x_write_event_config(struct iio_dev *indio_dev, 405 const struct iio_chan_spec *chan, 406 enum iio_event_type type, 407 enum iio_event_direction dir, 408 int state) 409 { 410 struct ad799x_state *st = iio_priv(indio_dev); 411 int ret; 412 413 ret = iio_device_claim_direct_mode(indio_dev); 414 if (ret) 415 return ret; 416 417 mutex_lock(&st->lock); 418 419 if (state) 420 st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT; 421 else 422 st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT); 423 424 if (st->config >> AD799X_CHANNEL_SHIFT) 425 st->config |= AD7998_ALERT_EN; 426 else 427 st->config &= ~AD7998_ALERT_EN; 428 429 ret = ad799x_write_config(st, st->config); 430 mutex_unlock(&st->lock); 431 iio_device_release_direct_mode(indio_dev); 432 return ret; 433 } 434 435 static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan, 436 enum iio_event_direction dir, 437 enum iio_event_info info) 438 { 439 switch (info) { 440 case IIO_EV_INFO_VALUE: 441 if (dir == IIO_EV_DIR_FALLING) 442 return AD7998_DATALOW_REG(chan->channel); 443 else 444 return AD7998_DATAHIGH_REG(chan->channel); 445 case IIO_EV_INFO_HYSTERESIS: 446 return AD7998_HYST_REG(chan->channel); 447 default: 448 return -EINVAL; 449 } 450 451 return 0; 452 } 453 454 static int ad799x_write_event_value(struct iio_dev *indio_dev, 455 const struct iio_chan_spec *chan, 456 enum iio_event_type type, 457 enum iio_event_direction dir, 458 enum iio_event_info info, 459 int val, int val2) 460 { 461 int ret; 462 struct ad799x_state *st = iio_priv(indio_dev); 463 464 if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0)) 465 return -EINVAL; 466 467 ret = i2c_smbus_write_word_swapped(st->client, 468 ad799x_threshold_reg(chan, dir, info), 469 val << chan->scan_type.shift); 470 471 return ret; 472 } 473 474 static int ad799x_read_event_value(struct iio_dev *indio_dev, 475 const struct iio_chan_spec *chan, 476 enum iio_event_type type, 477 enum iio_event_direction dir, 478 enum iio_event_info info, 479 int *val, int *val2) 480 { 481 int ret; 482 struct ad799x_state *st = iio_priv(indio_dev); 483 484 ret = i2c_smbus_read_word_swapped(st->client, 485 ad799x_threshold_reg(chan, dir, info)); 486 if (ret < 0) 487 return ret; 488 *val = (ret >> chan->scan_type.shift) & 489 GENMASK(chan->scan_type.realbits - 1, 0); 490 491 return IIO_VAL_INT; 492 } 493 494 static irqreturn_t ad799x_event_handler(int irq, void *private) 495 { 496 struct iio_dev *indio_dev = private; 497 struct ad799x_state *st = iio_priv(private); 498 int i, ret; 499 500 ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG); 501 if (ret <= 0) 502 goto done; 503 504 if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG, 505 AD7998_ALERT_STAT_CLEAR) < 0) 506 goto done; 507 508 for (i = 0; i < 8; i++) { 509 if (ret & BIT(i)) 510 iio_push_event(indio_dev, 511 i & 0x1 ? 512 IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 513 (i >> 1), 514 IIO_EV_TYPE_THRESH, 515 IIO_EV_DIR_RISING) : 516 IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 517 (i >> 1), 518 IIO_EV_TYPE_THRESH, 519 IIO_EV_DIR_FALLING), 520 iio_get_time_ns(indio_dev)); 521 } 522 523 done: 524 return IRQ_HANDLED; 525 } 526 527 static IIO_DEV_ATTR_SAMP_FREQ(0644, 528 ad799x_read_frequency, 529 ad799x_write_frequency); 530 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0"); 531 532 static struct attribute *ad799x_event_attributes[] = { 533 &iio_dev_attr_sampling_frequency.dev_attr.attr, 534 &iio_const_attr_sampling_frequency_available.dev_attr.attr, 535 NULL, 536 }; 537 538 static const struct attribute_group ad799x_event_attrs_group = { 539 .attrs = ad799x_event_attributes, 540 }; 541 542 static const struct iio_info ad7991_info = { 543 .read_raw = &ad799x_read_raw, 544 .update_scan_mode = ad799x_update_scan_mode, 545 }; 546 547 static const struct iio_info ad7993_4_7_8_noirq_info = { 548 .read_raw = &ad799x_read_raw, 549 .update_scan_mode = ad799x_update_scan_mode, 550 }; 551 552 static const struct iio_info ad7993_4_7_8_irq_info = { 553 .read_raw = &ad799x_read_raw, 554 .event_attrs = &ad799x_event_attrs_group, 555 .read_event_config = &ad799x_read_event_config, 556 .write_event_config = &ad799x_write_event_config, 557 .read_event_value = &ad799x_read_event_value, 558 .write_event_value = &ad799x_write_event_value, 559 .update_scan_mode = ad799x_update_scan_mode, 560 }; 561 562 static const struct iio_event_spec ad799x_events[] = { 563 { 564 .type = IIO_EV_TYPE_THRESH, 565 .dir = IIO_EV_DIR_RISING, 566 .mask_separate = BIT(IIO_EV_INFO_VALUE) | 567 BIT(IIO_EV_INFO_ENABLE), 568 }, { 569 .type = IIO_EV_TYPE_THRESH, 570 .dir = IIO_EV_DIR_FALLING, 571 .mask_separate = BIT(IIO_EV_INFO_VALUE) | 572 BIT(IIO_EV_INFO_ENABLE), 573 }, { 574 .type = IIO_EV_TYPE_THRESH, 575 .dir = IIO_EV_DIR_EITHER, 576 .mask_separate = BIT(IIO_EV_INFO_HYSTERESIS), 577 }, 578 }; 579 580 #define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \ 581 .type = IIO_VOLTAGE, \ 582 .indexed = 1, \ 583 .channel = (_index), \ 584 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 585 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ 586 .scan_index = (_index), \ 587 .scan_type = { \ 588 .sign = 'u', \ 589 .realbits = (_realbits), \ 590 .storagebits = 16, \ 591 .shift = 12 - (_realbits), \ 592 .endianness = IIO_BE, \ 593 }, \ 594 .event_spec = _ev_spec, \ 595 .num_event_specs = _num_ev_spec, \ 596 } 597 598 #define AD799X_CHANNEL(_index, _realbits) \ 599 _AD799X_CHANNEL(_index, _realbits, NULL, 0) 600 601 #define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \ 602 _AD799X_CHANNEL(_index, _realbits, ad799x_events, \ 603 ARRAY_SIZE(ad799x_events)) 604 605 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = { 606 [ad7991] = { 607 .num_channels = 5, 608 .noirq_config = { 609 .channel = { 610 AD799X_CHANNEL(0, 12), 611 AD799X_CHANNEL(1, 12), 612 AD799X_CHANNEL(2, 12), 613 AD799X_CHANNEL(3, 12), 614 IIO_CHAN_SOFT_TIMESTAMP(4), 615 }, 616 .info = &ad7991_info, 617 }, 618 }, 619 [ad7995] = { 620 .num_channels = 5, 621 .noirq_config = { 622 .channel = { 623 AD799X_CHANNEL(0, 10), 624 AD799X_CHANNEL(1, 10), 625 AD799X_CHANNEL(2, 10), 626 AD799X_CHANNEL(3, 10), 627 IIO_CHAN_SOFT_TIMESTAMP(4), 628 }, 629 .info = &ad7991_info, 630 }, 631 }, 632 [ad7999] = { 633 .num_channels = 5, 634 .noirq_config = { 635 .channel = { 636 AD799X_CHANNEL(0, 8), 637 AD799X_CHANNEL(1, 8), 638 AD799X_CHANNEL(2, 8), 639 AD799X_CHANNEL(3, 8), 640 IIO_CHAN_SOFT_TIMESTAMP(4), 641 }, 642 .info = &ad7991_info, 643 }, 644 }, 645 [ad7992] = { 646 .num_channels = 3, 647 .noirq_config = { 648 .channel = { 649 AD799X_CHANNEL(0, 12), 650 AD799X_CHANNEL(1, 12), 651 IIO_CHAN_SOFT_TIMESTAMP(3), 652 }, 653 .info = &ad7993_4_7_8_noirq_info, 654 }, 655 .irq_config = { 656 .channel = { 657 AD799X_CHANNEL_WITH_EVENTS(0, 12), 658 AD799X_CHANNEL_WITH_EVENTS(1, 12), 659 IIO_CHAN_SOFT_TIMESTAMP(3), 660 }, 661 .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT, 662 .info = &ad7993_4_7_8_irq_info, 663 }, 664 }, 665 [ad7993] = { 666 .num_channels = 5, 667 .noirq_config = { 668 .channel = { 669 AD799X_CHANNEL(0, 10), 670 AD799X_CHANNEL(1, 10), 671 AD799X_CHANNEL(2, 10), 672 AD799X_CHANNEL(3, 10), 673 IIO_CHAN_SOFT_TIMESTAMP(4), 674 }, 675 .info = &ad7993_4_7_8_noirq_info, 676 }, 677 .irq_config = { 678 .channel = { 679 AD799X_CHANNEL_WITH_EVENTS(0, 10), 680 AD799X_CHANNEL_WITH_EVENTS(1, 10), 681 AD799X_CHANNEL_WITH_EVENTS(2, 10), 682 AD799X_CHANNEL_WITH_EVENTS(3, 10), 683 IIO_CHAN_SOFT_TIMESTAMP(4), 684 }, 685 .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT, 686 .info = &ad7993_4_7_8_irq_info, 687 }, 688 }, 689 [ad7994] = { 690 .num_channels = 5, 691 .noirq_config = { 692 .channel = { 693 AD799X_CHANNEL(0, 12), 694 AD799X_CHANNEL(1, 12), 695 AD799X_CHANNEL(2, 12), 696 AD799X_CHANNEL(3, 12), 697 IIO_CHAN_SOFT_TIMESTAMP(4), 698 }, 699 .info = &ad7993_4_7_8_noirq_info, 700 }, 701 .irq_config = { 702 .channel = { 703 AD799X_CHANNEL_WITH_EVENTS(0, 12), 704 AD799X_CHANNEL_WITH_EVENTS(1, 12), 705 AD799X_CHANNEL_WITH_EVENTS(2, 12), 706 AD799X_CHANNEL_WITH_EVENTS(3, 12), 707 IIO_CHAN_SOFT_TIMESTAMP(4), 708 }, 709 .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT, 710 .info = &ad7993_4_7_8_irq_info, 711 }, 712 }, 713 [ad7997] = { 714 .num_channels = 9, 715 .noirq_config = { 716 .channel = { 717 AD799X_CHANNEL(0, 10), 718 AD799X_CHANNEL(1, 10), 719 AD799X_CHANNEL(2, 10), 720 AD799X_CHANNEL(3, 10), 721 AD799X_CHANNEL(4, 10), 722 AD799X_CHANNEL(5, 10), 723 AD799X_CHANNEL(6, 10), 724 AD799X_CHANNEL(7, 10), 725 IIO_CHAN_SOFT_TIMESTAMP(8), 726 }, 727 .info = &ad7993_4_7_8_noirq_info, 728 }, 729 .irq_config = { 730 .channel = { 731 AD799X_CHANNEL_WITH_EVENTS(0, 10), 732 AD799X_CHANNEL_WITH_EVENTS(1, 10), 733 AD799X_CHANNEL_WITH_EVENTS(2, 10), 734 AD799X_CHANNEL_WITH_EVENTS(3, 10), 735 AD799X_CHANNEL(4, 10), 736 AD799X_CHANNEL(5, 10), 737 AD799X_CHANNEL(6, 10), 738 AD799X_CHANNEL(7, 10), 739 IIO_CHAN_SOFT_TIMESTAMP(8), 740 }, 741 .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT, 742 .info = &ad7993_4_7_8_irq_info, 743 }, 744 }, 745 [ad7998] = { 746 .num_channels = 9, 747 .noirq_config = { 748 .channel = { 749 AD799X_CHANNEL(0, 12), 750 AD799X_CHANNEL(1, 12), 751 AD799X_CHANNEL(2, 12), 752 AD799X_CHANNEL(3, 12), 753 AD799X_CHANNEL(4, 12), 754 AD799X_CHANNEL(5, 12), 755 AD799X_CHANNEL(6, 12), 756 AD799X_CHANNEL(7, 12), 757 IIO_CHAN_SOFT_TIMESTAMP(8), 758 }, 759 .info = &ad7993_4_7_8_noirq_info, 760 }, 761 .irq_config = { 762 .channel = { 763 AD799X_CHANNEL_WITH_EVENTS(0, 12), 764 AD799X_CHANNEL_WITH_EVENTS(1, 12), 765 AD799X_CHANNEL_WITH_EVENTS(2, 12), 766 AD799X_CHANNEL_WITH_EVENTS(3, 12), 767 AD799X_CHANNEL(4, 12), 768 AD799X_CHANNEL(5, 12), 769 AD799X_CHANNEL(6, 12), 770 AD799X_CHANNEL(7, 12), 771 IIO_CHAN_SOFT_TIMESTAMP(8), 772 }, 773 .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT, 774 .info = &ad7993_4_7_8_irq_info, 775 }, 776 }, 777 }; 778 779 static int ad799x_probe(struct i2c_client *client) 780 { 781 const struct i2c_device_id *id = i2c_client_get_device_id(client); 782 int ret; 783 int extra_config = 0; 784 struct ad799x_state *st; 785 struct iio_dev *indio_dev; 786 const struct ad799x_chip_info *chip_info = 787 &ad799x_chip_info_tbl[id->driver_data]; 788 789 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st)); 790 if (indio_dev == NULL) 791 return -ENOMEM; 792 793 st = iio_priv(indio_dev); 794 /* this is only used for device removal purposes */ 795 i2c_set_clientdata(client, indio_dev); 796 797 st->id = id->driver_data; 798 if (client->irq > 0 && chip_info->irq_config.info) 799 st->chip_config = &chip_info->irq_config; 800 else 801 st->chip_config = &chip_info->noirq_config; 802 803 /* TODO: Add pdata options for filtering and bit delay */ 804 805 st->reg = devm_regulator_get(&client->dev, "vcc"); 806 if (IS_ERR(st->reg)) 807 return PTR_ERR(st->reg); 808 ret = regulator_enable(st->reg); 809 if (ret) 810 return ret; 811 812 /* check if an external reference is supplied */ 813 st->vref = devm_regulator_get_optional(&client->dev, "vref"); 814 815 if (IS_ERR(st->vref)) { 816 if (PTR_ERR(st->vref) == -ENODEV) { 817 st->vref = NULL; 818 dev_info(&client->dev, "Using VCC reference voltage\n"); 819 } else { 820 ret = PTR_ERR(st->vref); 821 goto error_disable_reg; 822 } 823 } 824 825 if (st->vref) { 826 /* 827 * Use external reference voltage if supported by hardware. 828 * This is optional if voltage / regulator present, use VCC otherwise. 829 */ 830 if ((st->id == ad7991) || (st->id == ad7995) || (st->id == ad7999)) { 831 dev_info(&client->dev, "Using external reference voltage\n"); 832 extra_config |= AD7991_REF_SEL; 833 ret = regulator_enable(st->vref); 834 if (ret) 835 goto error_disable_reg; 836 } else { 837 st->vref = NULL; 838 dev_warn(&client->dev, "Supplied reference not supported\n"); 839 } 840 } 841 842 st->client = client; 843 844 indio_dev->name = id->name; 845 indio_dev->info = st->chip_config->info; 846 847 indio_dev->modes = INDIO_DIRECT_MODE; 848 indio_dev->channels = st->chip_config->channel; 849 indio_dev->num_channels = chip_info->num_channels; 850 851 ret = ad799x_update_config(st, st->chip_config->default_config | extra_config); 852 if (ret) 853 goto error_disable_vref; 854 855 ret = iio_triggered_buffer_setup(indio_dev, NULL, 856 &ad799x_trigger_handler, NULL); 857 if (ret) 858 goto error_disable_vref; 859 860 if (client->irq > 0) { 861 ret = devm_request_threaded_irq(&client->dev, 862 client->irq, 863 NULL, 864 ad799x_event_handler, 865 IRQF_TRIGGER_FALLING | 866 IRQF_ONESHOT, 867 client->name, 868 indio_dev); 869 if (ret) 870 goto error_cleanup_ring; 871 } 872 873 mutex_init(&st->lock); 874 875 ret = iio_device_register(indio_dev); 876 if (ret) 877 goto error_cleanup_ring; 878 879 return 0; 880 881 error_cleanup_ring: 882 iio_triggered_buffer_cleanup(indio_dev); 883 error_disable_vref: 884 if (st->vref) 885 regulator_disable(st->vref); 886 error_disable_reg: 887 regulator_disable(st->reg); 888 889 return ret; 890 } 891 892 static void ad799x_remove(struct i2c_client *client) 893 { 894 struct iio_dev *indio_dev = i2c_get_clientdata(client); 895 struct ad799x_state *st = iio_priv(indio_dev); 896 897 iio_device_unregister(indio_dev); 898 899 iio_triggered_buffer_cleanup(indio_dev); 900 if (st->vref) 901 regulator_disable(st->vref); 902 regulator_disable(st->reg); 903 kfree(st->rx_buf); 904 } 905 906 static int ad799x_suspend(struct device *dev) 907 { 908 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 909 struct ad799x_state *st = iio_priv(indio_dev); 910 911 if (st->vref) 912 regulator_disable(st->vref); 913 regulator_disable(st->reg); 914 915 return 0; 916 } 917 918 static int ad799x_resume(struct device *dev) 919 { 920 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 921 struct ad799x_state *st = iio_priv(indio_dev); 922 int ret; 923 924 ret = regulator_enable(st->reg); 925 if (ret) { 926 dev_err(dev, "Unable to enable vcc regulator\n"); 927 return ret; 928 } 929 930 if (st->vref) { 931 ret = regulator_enable(st->vref); 932 if (ret) { 933 regulator_disable(st->reg); 934 dev_err(dev, "Unable to enable vref regulator\n"); 935 return ret; 936 } 937 } 938 939 /* resync config */ 940 ret = ad799x_update_config(st, st->config); 941 if (ret) { 942 if (st->vref) 943 regulator_disable(st->vref); 944 regulator_disable(st->reg); 945 return ret; 946 } 947 948 return 0; 949 } 950 951 static DEFINE_SIMPLE_DEV_PM_OPS(ad799x_pm_ops, ad799x_suspend, ad799x_resume); 952 953 static const struct i2c_device_id ad799x_id[] = { 954 { "ad7991", ad7991 }, 955 { "ad7995", ad7995 }, 956 { "ad7999", ad7999 }, 957 { "ad7992", ad7992 }, 958 { "ad7993", ad7993 }, 959 { "ad7994", ad7994 }, 960 { "ad7997", ad7997 }, 961 { "ad7998", ad7998 }, 962 {} 963 }; 964 965 MODULE_DEVICE_TABLE(i2c, ad799x_id); 966 967 static struct i2c_driver ad799x_driver = { 968 .driver = { 969 .name = "ad799x", 970 .pm = pm_sleep_ptr(&ad799x_pm_ops), 971 }, 972 .probe = ad799x_probe, 973 .remove = ad799x_remove, 974 .id_table = ad799x_id, 975 }; 976 module_i2c_driver(ad799x_driver); 977 978 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); 979 MODULE_DESCRIPTION("Analog Devices AD799x ADC"); 980 MODULE_LICENSE("GPL v2"); 981