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 /** 171 * ad799x_trigger_handler() bh of trigger launched polling to ring buffer 172 * 173 * Currently there is no option in this driver to disable the saving of 174 * timestamps within the ring. 175 **/ 176 static irqreturn_t ad799x_trigger_handler(int irq, void *p) 177 { 178 struct iio_poll_func *pf = p; 179 struct iio_dev *indio_dev = pf->indio_dev; 180 struct ad799x_state *st = iio_priv(indio_dev); 181 int b_sent; 182 u8 cmd; 183 184 switch (st->id) { 185 case ad7991: 186 case ad7995: 187 case ad7999: 188 cmd = st->config | 189 (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT); 190 break; 191 case ad7992: 192 case ad7993: 193 case ad7994: 194 cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) | 195 AD7998_CONV_RES_REG; 196 break; 197 case ad7997: 198 case ad7998: 199 cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG; 200 break; 201 default: 202 cmd = 0; 203 } 204 205 b_sent = i2c_smbus_read_i2c_block_data(st->client, 206 cmd, st->transfer_size, st->rx_buf); 207 if (b_sent < 0) 208 goto out; 209 210 iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf, 211 iio_get_time_ns(indio_dev)); 212 out: 213 iio_trigger_notify_done(indio_dev->trig); 214 215 return IRQ_HANDLED; 216 } 217 218 static int ad799x_update_scan_mode(struct iio_dev *indio_dev, 219 const unsigned long *scan_mask) 220 { 221 struct ad799x_state *st = iio_priv(indio_dev); 222 223 kfree(st->rx_buf); 224 st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL); 225 if (!st->rx_buf) 226 return -ENOMEM; 227 228 st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2; 229 230 switch (st->id) { 231 case ad7992: 232 case ad7993: 233 case ad7994: 234 case ad7997: 235 case ad7998: 236 st->config &= ~(GENMASK(7, 0) << AD799X_CHANNEL_SHIFT); 237 st->config |= (*scan_mask << AD799X_CHANNEL_SHIFT); 238 return ad799x_write_config(st, st->config); 239 default: 240 return 0; 241 } 242 } 243 244 static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch) 245 { 246 u8 cmd; 247 248 switch (st->id) { 249 case ad7991: 250 case ad7995: 251 case ad7999: 252 cmd = st->config | (BIT(ch) << AD799X_CHANNEL_SHIFT); 253 break; 254 case ad7992: 255 case ad7993: 256 case ad7994: 257 cmd = BIT(ch) << AD799X_CHANNEL_SHIFT; 258 break; 259 case ad7997: 260 case ad7998: 261 cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE; 262 break; 263 default: 264 return -EINVAL; 265 } 266 267 return i2c_smbus_read_word_swapped(st->client, cmd); 268 } 269 270 static int ad799x_read_raw(struct iio_dev *indio_dev, 271 struct iio_chan_spec const *chan, 272 int *val, 273 int *val2, 274 long m) 275 { 276 int ret; 277 struct ad799x_state *st = iio_priv(indio_dev); 278 279 switch (m) { 280 case IIO_CHAN_INFO_RAW: 281 ret = iio_device_claim_direct_mode(indio_dev); 282 if (ret) 283 return ret; 284 ret = ad799x_scan_direct(st, chan->scan_index); 285 iio_device_release_direct_mode(indio_dev); 286 287 if (ret < 0) 288 return ret; 289 *val = (ret >> chan->scan_type.shift) & 290 GENMASK(chan->scan_type.realbits - 1, 0); 291 return IIO_VAL_INT; 292 case IIO_CHAN_INFO_SCALE: 293 ret = regulator_get_voltage(st->vref); 294 if (ret < 0) 295 return ret; 296 *val = ret / 1000; 297 *val2 = chan->scan_type.realbits; 298 return IIO_VAL_FRACTIONAL_LOG2; 299 } 300 return -EINVAL; 301 } 302 static const unsigned int ad7998_frequencies[] = { 303 [AD7998_CYC_DIS] = 0, 304 [AD7998_CYC_TCONF_32] = 15625, 305 [AD7998_CYC_TCONF_64] = 7812, 306 [AD7998_CYC_TCONF_128] = 3906, 307 [AD7998_CYC_TCONF_512] = 976, 308 [AD7998_CYC_TCONF_1024] = 488, 309 [AD7998_CYC_TCONF_2048] = 244, 310 }; 311 312 static ssize_t ad799x_read_frequency(struct device *dev, 313 struct device_attribute *attr, 314 char *buf) 315 { 316 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 317 struct ad799x_state *st = iio_priv(indio_dev); 318 319 int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG); 320 if (ret < 0) 321 return ret; 322 323 return sprintf(buf, "%u\n", ad7998_frequencies[ret & AD7998_CYC_MASK]); 324 } 325 326 static ssize_t ad799x_write_frequency(struct device *dev, 327 struct device_attribute *attr, 328 const char *buf, 329 size_t len) 330 { 331 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 332 struct ad799x_state *st = iio_priv(indio_dev); 333 334 long val; 335 int ret, i; 336 337 ret = kstrtol(buf, 10, &val); 338 if (ret) 339 return ret; 340 341 mutex_lock(&indio_dev->mlock); 342 ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG); 343 if (ret < 0) 344 goto error_ret_mutex; 345 /* Wipe the bits clean */ 346 ret &= ~AD7998_CYC_MASK; 347 348 for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++) 349 if (val == ad7998_frequencies[i]) 350 break; 351 if (i == ARRAY_SIZE(ad7998_frequencies)) { 352 ret = -EINVAL; 353 goto error_ret_mutex; 354 } 355 356 ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG, 357 ret | i); 358 if (ret < 0) 359 goto error_ret_mutex; 360 ret = len; 361 362 error_ret_mutex: 363 mutex_unlock(&indio_dev->mlock); 364 365 return ret; 366 } 367 368 static int ad799x_read_event_config(struct iio_dev *indio_dev, 369 const struct iio_chan_spec *chan, 370 enum iio_event_type type, 371 enum iio_event_direction dir) 372 { 373 struct ad799x_state *st = iio_priv(indio_dev); 374 375 if (!(st->config & AD7998_ALERT_EN)) 376 return 0; 377 378 if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index)) 379 return 1; 380 381 return 0; 382 } 383 384 static int ad799x_write_event_config(struct iio_dev *indio_dev, 385 const struct iio_chan_spec *chan, 386 enum iio_event_type type, 387 enum iio_event_direction dir, 388 int state) 389 { 390 struct ad799x_state *st = iio_priv(indio_dev); 391 int ret; 392 393 ret = iio_device_claim_direct_mode(indio_dev); 394 if (ret) 395 return ret; 396 397 if (state) 398 st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT; 399 else 400 st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT); 401 402 if (st->config >> AD799X_CHANNEL_SHIFT) 403 st->config |= AD7998_ALERT_EN; 404 else 405 st->config &= ~AD7998_ALERT_EN; 406 407 ret = ad799x_write_config(st, st->config); 408 iio_device_release_direct_mode(indio_dev); 409 return ret; 410 } 411 412 static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan, 413 enum iio_event_direction dir, 414 enum iio_event_info info) 415 { 416 switch (info) { 417 case IIO_EV_INFO_VALUE: 418 if (dir == IIO_EV_DIR_FALLING) 419 return AD7998_DATALOW_REG(chan->channel); 420 else 421 return AD7998_DATAHIGH_REG(chan->channel); 422 case IIO_EV_INFO_HYSTERESIS: 423 return AD7998_HYST_REG(chan->channel); 424 default: 425 return -EINVAL; 426 } 427 428 return 0; 429 } 430 431 static int ad799x_write_event_value(struct iio_dev *indio_dev, 432 const struct iio_chan_spec *chan, 433 enum iio_event_type type, 434 enum iio_event_direction dir, 435 enum iio_event_info info, 436 int val, int val2) 437 { 438 int ret; 439 struct ad799x_state *st = iio_priv(indio_dev); 440 441 if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0)) 442 return -EINVAL; 443 444 mutex_lock(&indio_dev->mlock); 445 ret = i2c_smbus_write_word_swapped(st->client, 446 ad799x_threshold_reg(chan, dir, info), 447 val << chan->scan_type.shift); 448 mutex_unlock(&indio_dev->mlock); 449 450 return ret; 451 } 452 453 static int ad799x_read_event_value(struct iio_dev *indio_dev, 454 const struct iio_chan_spec *chan, 455 enum iio_event_type type, 456 enum iio_event_direction dir, 457 enum iio_event_info info, 458 int *val, int *val2) 459 { 460 int ret; 461 struct ad799x_state *st = iio_priv(indio_dev); 462 463 mutex_lock(&indio_dev->mlock); 464 ret = i2c_smbus_read_word_swapped(st->client, 465 ad799x_threshold_reg(chan, dir, info)); 466 mutex_unlock(&indio_dev->mlock); 467 if (ret < 0) 468 return ret; 469 *val = (ret >> chan->scan_type.shift) & 470 GENMASK(chan->scan_type.realbits - 1, 0); 471 472 return IIO_VAL_INT; 473 } 474 475 static irqreturn_t ad799x_event_handler(int irq, void *private) 476 { 477 struct iio_dev *indio_dev = private; 478 struct ad799x_state *st = iio_priv(private); 479 int i, ret; 480 481 ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG); 482 if (ret <= 0) 483 goto done; 484 485 if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG, 486 AD7998_ALERT_STAT_CLEAR) < 0) 487 goto done; 488 489 for (i = 0; i < 8; i++) { 490 if (ret & BIT(i)) 491 iio_push_event(indio_dev, 492 i & 0x1 ? 493 IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 494 (i >> 1), 495 IIO_EV_TYPE_THRESH, 496 IIO_EV_DIR_RISING) : 497 IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 498 (i >> 1), 499 IIO_EV_TYPE_THRESH, 500 IIO_EV_DIR_FALLING), 501 iio_get_time_ns(indio_dev)); 502 } 503 504 done: 505 return IRQ_HANDLED; 506 } 507 508 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, 509 ad799x_read_frequency, 510 ad799x_write_frequency); 511 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0"); 512 513 static struct attribute *ad799x_event_attributes[] = { 514 &iio_dev_attr_sampling_frequency.dev_attr.attr, 515 &iio_const_attr_sampling_frequency_available.dev_attr.attr, 516 NULL, 517 }; 518 519 static const struct attribute_group ad799x_event_attrs_group = { 520 .attrs = ad799x_event_attributes, 521 }; 522 523 static const struct iio_info ad7991_info = { 524 .read_raw = &ad799x_read_raw, 525 .update_scan_mode = ad799x_update_scan_mode, 526 }; 527 528 static const struct iio_info ad7993_4_7_8_noirq_info = { 529 .read_raw = &ad799x_read_raw, 530 .update_scan_mode = ad799x_update_scan_mode, 531 }; 532 533 static const struct iio_info ad7993_4_7_8_irq_info = { 534 .read_raw = &ad799x_read_raw, 535 .event_attrs = &ad799x_event_attrs_group, 536 .read_event_config = &ad799x_read_event_config, 537 .write_event_config = &ad799x_write_event_config, 538 .read_event_value = &ad799x_read_event_value, 539 .write_event_value = &ad799x_write_event_value, 540 .update_scan_mode = ad799x_update_scan_mode, 541 }; 542 543 static const struct iio_event_spec ad799x_events[] = { 544 { 545 .type = IIO_EV_TYPE_THRESH, 546 .dir = IIO_EV_DIR_RISING, 547 .mask_separate = BIT(IIO_EV_INFO_VALUE) | 548 BIT(IIO_EV_INFO_ENABLE), 549 }, { 550 .type = IIO_EV_TYPE_THRESH, 551 .dir = IIO_EV_DIR_FALLING, 552 .mask_separate = BIT(IIO_EV_INFO_VALUE) | 553 BIT(IIO_EV_INFO_ENABLE), 554 }, { 555 .type = IIO_EV_TYPE_THRESH, 556 .dir = IIO_EV_DIR_EITHER, 557 .mask_separate = BIT(IIO_EV_INFO_HYSTERESIS), 558 }, 559 }; 560 561 #define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \ 562 .type = IIO_VOLTAGE, \ 563 .indexed = 1, \ 564 .channel = (_index), \ 565 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 566 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ 567 .scan_index = (_index), \ 568 .scan_type = { \ 569 .sign = 'u', \ 570 .realbits = (_realbits), \ 571 .storagebits = 16, \ 572 .shift = 12 - (_realbits), \ 573 .endianness = IIO_BE, \ 574 }, \ 575 .event_spec = _ev_spec, \ 576 .num_event_specs = _num_ev_spec, \ 577 } 578 579 #define AD799X_CHANNEL(_index, _realbits) \ 580 _AD799X_CHANNEL(_index, _realbits, NULL, 0) 581 582 #define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \ 583 _AD799X_CHANNEL(_index, _realbits, ad799x_events, \ 584 ARRAY_SIZE(ad799x_events)) 585 586 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = { 587 [ad7991] = { 588 .num_channels = 5, 589 .noirq_config = { 590 .channel = { 591 AD799X_CHANNEL(0, 12), 592 AD799X_CHANNEL(1, 12), 593 AD799X_CHANNEL(2, 12), 594 AD799X_CHANNEL(3, 12), 595 IIO_CHAN_SOFT_TIMESTAMP(4), 596 }, 597 .info = &ad7991_info, 598 }, 599 }, 600 [ad7995] = { 601 .num_channels = 5, 602 .noirq_config = { 603 .channel = { 604 AD799X_CHANNEL(0, 10), 605 AD799X_CHANNEL(1, 10), 606 AD799X_CHANNEL(2, 10), 607 AD799X_CHANNEL(3, 10), 608 IIO_CHAN_SOFT_TIMESTAMP(4), 609 }, 610 .info = &ad7991_info, 611 }, 612 }, 613 [ad7999] = { 614 .num_channels = 5, 615 .noirq_config = { 616 .channel = { 617 AD799X_CHANNEL(0, 8), 618 AD799X_CHANNEL(1, 8), 619 AD799X_CHANNEL(2, 8), 620 AD799X_CHANNEL(3, 8), 621 IIO_CHAN_SOFT_TIMESTAMP(4), 622 }, 623 .info = &ad7991_info, 624 }, 625 }, 626 [ad7992] = { 627 .num_channels = 3, 628 .noirq_config = { 629 .channel = { 630 AD799X_CHANNEL(0, 12), 631 AD799X_CHANNEL(1, 12), 632 IIO_CHAN_SOFT_TIMESTAMP(3), 633 }, 634 .info = &ad7993_4_7_8_noirq_info, 635 }, 636 .irq_config = { 637 .channel = { 638 AD799X_CHANNEL_WITH_EVENTS(0, 12), 639 AD799X_CHANNEL_WITH_EVENTS(1, 12), 640 IIO_CHAN_SOFT_TIMESTAMP(3), 641 }, 642 .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT, 643 .info = &ad7993_4_7_8_irq_info, 644 }, 645 }, 646 [ad7993] = { 647 .num_channels = 5, 648 .noirq_config = { 649 .channel = { 650 AD799X_CHANNEL(0, 10), 651 AD799X_CHANNEL(1, 10), 652 AD799X_CHANNEL(2, 10), 653 AD799X_CHANNEL(3, 10), 654 IIO_CHAN_SOFT_TIMESTAMP(4), 655 }, 656 .info = &ad7993_4_7_8_noirq_info, 657 }, 658 .irq_config = { 659 .channel = { 660 AD799X_CHANNEL_WITH_EVENTS(0, 10), 661 AD799X_CHANNEL_WITH_EVENTS(1, 10), 662 AD799X_CHANNEL_WITH_EVENTS(2, 10), 663 AD799X_CHANNEL_WITH_EVENTS(3, 10), 664 IIO_CHAN_SOFT_TIMESTAMP(4), 665 }, 666 .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT, 667 .info = &ad7993_4_7_8_irq_info, 668 }, 669 }, 670 [ad7994] = { 671 .num_channels = 5, 672 .noirq_config = { 673 .channel = { 674 AD799X_CHANNEL(0, 12), 675 AD799X_CHANNEL(1, 12), 676 AD799X_CHANNEL(2, 12), 677 AD799X_CHANNEL(3, 12), 678 IIO_CHAN_SOFT_TIMESTAMP(4), 679 }, 680 .info = &ad7993_4_7_8_noirq_info, 681 }, 682 .irq_config = { 683 .channel = { 684 AD799X_CHANNEL_WITH_EVENTS(0, 12), 685 AD799X_CHANNEL_WITH_EVENTS(1, 12), 686 AD799X_CHANNEL_WITH_EVENTS(2, 12), 687 AD799X_CHANNEL_WITH_EVENTS(3, 12), 688 IIO_CHAN_SOFT_TIMESTAMP(4), 689 }, 690 .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT, 691 .info = &ad7993_4_7_8_irq_info, 692 }, 693 }, 694 [ad7997] = { 695 .num_channels = 9, 696 .noirq_config = { 697 .channel = { 698 AD799X_CHANNEL(0, 10), 699 AD799X_CHANNEL(1, 10), 700 AD799X_CHANNEL(2, 10), 701 AD799X_CHANNEL(3, 10), 702 AD799X_CHANNEL(4, 10), 703 AD799X_CHANNEL(5, 10), 704 AD799X_CHANNEL(6, 10), 705 AD799X_CHANNEL(7, 10), 706 IIO_CHAN_SOFT_TIMESTAMP(8), 707 }, 708 .info = &ad7993_4_7_8_noirq_info, 709 }, 710 .irq_config = { 711 .channel = { 712 AD799X_CHANNEL_WITH_EVENTS(0, 10), 713 AD799X_CHANNEL_WITH_EVENTS(1, 10), 714 AD799X_CHANNEL_WITH_EVENTS(2, 10), 715 AD799X_CHANNEL_WITH_EVENTS(3, 10), 716 AD799X_CHANNEL(4, 10), 717 AD799X_CHANNEL(5, 10), 718 AD799X_CHANNEL(6, 10), 719 AD799X_CHANNEL(7, 10), 720 IIO_CHAN_SOFT_TIMESTAMP(8), 721 }, 722 .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT, 723 .info = &ad7993_4_7_8_irq_info, 724 }, 725 }, 726 [ad7998] = { 727 .num_channels = 9, 728 .noirq_config = { 729 .channel = { 730 AD799X_CHANNEL(0, 12), 731 AD799X_CHANNEL(1, 12), 732 AD799X_CHANNEL(2, 12), 733 AD799X_CHANNEL(3, 12), 734 AD799X_CHANNEL(4, 12), 735 AD799X_CHANNEL(5, 12), 736 AD799X_CHANNEL(6, 12), 737 AD799X_CHANNEL(7, 12), 738 IIO_CHAN_SOFT_TIMESTAMP(8), 739 }, 740 .info = &ad7993_4_7_8_noirq_info, 741 }, 742 .irq_config = { 743 .channel = { 744 AD799X_CHANNEL_WITH_EVENTS(0, 12), 745 AD799X_CHANNEL_WITH_EVENTS(1, 12), 746 AD799X_CHANNEL_WITH_EVENTS(2, 12), 747 AD799X_CHANNEL_WITH_EVENTS(3, 12), 748 AD799X_CHANNEL(4, 12), 749 AD799X_CHANNEL(5, 12), 750 AD799X_CHANNEL(6, 12), 751 AD799X_CHANNEL(7, 12), 752 IIO_CHAN_SOFT_TIMESTAMP(8), 753 }, 754 .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT, 755 .info = &ad7993_4_7_8_irq_info, 756 }, 757 }, 758 }; 759 760 static int ad799x_probe(struct i2c_client *client, 761 const struct i2c_device_id *id) 762 { 763 int ret; 764 struct ad799x_state *st; 765 struct iio_dev *indio_dev; 766 const struct ad799x_chip_info *chip_info = 767 &ad799x_chip_info_tbl[id->driver_data]; 768 769 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st)); 770 if (indio_dev == NULL) 771 return -ENOMEM; 772 773 st = iio_priv(indio_dev); 774 /* this is only used for device removal purposes */ 775 i2c_set_clientdata(client, indio_dev); 776 777 st->id = id->driver_data; 778 if (client->irq > 0 && chip_info->irq_config.info) 779 st->chip_config = &chip_info->irq_config; 780 else 781 st->chip_config = &chip_info->noirq_config; 782 783 /* TODO: Add pdata options for filtering and bit delay */ 784 785 st->reg = devm_regulator_get(&client->dev, "vcc"); 786 if (IS_ERR(st->reg)) 787 return PTR_ERR(st->reg); 788 ret = regulator_enable(st->reg); 789 if (ret) 790 return ret; 791 st->vref = devm_regulator_get(&client->dev, "vref"); 792 if (IS_ERR(st->vref)) { 793 ret = PTR_ERR(st->vref); 794 goto error_disable_reg; 795 } 796 ret = regulator_enable(st->vref); 797 if (ret) 798 goto error_disable_reg; 799 800 st->client = client; 801 802 indio_dev->dev.parent = &client->dev; 803 indio_dev->dev.of_node = client->dev.of_node; 804 indio_dev->name = id->name; 805 indio_dev->info = st->chip_config->info; 806 807 indio_dev->modes = INDIO_DIRECT_MODE; 808 indio_dev->channels = st->chip_config->channel; 809 indio_dev->num_channels = chip_info->num_channels; 810 811 ret = ad799x_write_config(st, st->chip_config->default_config); 812 if (ret < 0) 813 goto error_disable_reg; 814 ret = ad799x_read_config(st); 815 if (ret < 0) 816 goto error_disable_reg; 817 st->config = ret; 818 819 ret = iio_triggered_buffer_setup(indio_dev, NULL, 820 &ad799x_trigger_handler, NULL); 821 if (ret) 822 goto error_disable_vref; 823 824 if (client->irq > 0) { 825 ret = devm_request_threaded_irq(&client->dev, 826 client->irq, 827 NULL, 828 ad799x_event_handler, 829 IRQF_TRIGGER_FALLING | 830 IRQF_ONESHOT, 831 client->name, 832 indio_dev); 833 if (ret) 834 goto error_cleanup_ring; 835 } 836 ret = iio_device_register(indio_dev); 837 if (ret) 838 goto error_cleanup_ring; 839 840 return 0; 841 842 error_cleanup_ring: 843 iio_triggered_buffer_cleanup(indio_dev); 844 error_disable_vref: 845 regulator_disable(st->vref); 846 error_disable_reg: 847 regulator_disable(st->reg); 848 849 return ret; 850 } 851 852 static int ad799x_remove(struct i2c_client *client) 853 { 854 struct iio_dev *indio_dev = i2c_get_clientdata(client); 855 struct ad799x_state *st = iio_priv(indio_dev); 856 857 iio_device_unregister(indio_dev); 858 859 iio_triggered_buffer_cleanup(indio_dev); 860 regulator_disable(st->vref); 861 regulator_disable(st->reg); 862 kfree(st->rx_buf); 863 864 return 0; 865 } 866 867 static const struct i2c_device_id ad799x_id[] = { 868 { "ad7991", ad7991 }, 869 { "ad7995", ad7995 }, 870 { "ad7999", ad7999 }, 871 { "ad7992", ad7992 }, 872 { "ad7993", ad7993 }, 873 { "ad7994", ad7994 }, 874 { "ad7997", ad7997 }, 875 { "ad7998", ad7998 }, 876 {} 877 }; 878 879 MODULE_DEVICE_TABLE(i2c, ad799x_id); 880 881 static struct i2c_driver ad799x_driver = { 882 .driver = { 883 .name = "ad799x", 884 }, 885 .probe = ad799x_probe, 886 .remove = ad799x_remove, 887 .id_table = ad799x_id, 888 }; 889 module_i2c_driver(ad799x_driver); 890 891 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); 892 MODULE_DESCRIPTION("Analog Devices AD799x ADC"); 893 MODULE_LICENSE("GPL v2"); 894