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