1 /* 2 * iio/adc/ad799x.c 3 * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc. 4 * 5 * based on iio/adc/max1363 6 * Copyright (C) 2008-2010 Jonathan Cameron 7 * 8 * based on linux/drivers/i2c/chips/max123x 9 * Copyright (C) 2002-2004 Stefan Eletzhofer 10 * 11 * based on linux/drivers/acron/char/pcf8583.c 12 * Copyright (C) 2000 Russell King 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License version 2 as 16 * published by the Free Software Foundation. 17 * 18 * ad799x.c 19 * 20 * Support for ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997, 21 * ad7998 and similar chips. 22 * 23 */ 24 25 #include <linux/interrupt.h> 26 #include <linux/device.h> 27 #include <linux/kernel.h> 28 #include <linux/sysfs.h> 29 #include <linux/i2c.h> 30 #include <linux/regulator/consumer.h> 31 #include <linux/slab.h> 32 #include <linux/types.h> 33 #include <linux/err.h> 34 #include <linux/module.h> 35 #include <linux/bitops.h> 36 37 #include <linux/iio/iio.h> 38 #include <linux/iio/sysfs.h> 39 #include <linux/iio/events.h> 40 #include <linux/iio/buffer.h> 41 #include <linux/iio/trigger_consumer.h> 42 #include <linux/iio/triggered_buffer.h> 43 44 #define AD799X_CHANNEL_SHIFT 4 45 46 /* 47 * AD7991, AD7995 and AD7999 defines 48 */ 49 50 #define AD7991_REF_SEL 0x08 51 #define AD7991_FLTR 0x04 52 #define AD7991_BIT_TRIAL_DELAY 0x02 53 #define AD7991_SAMPLE_DELAY 0x01 54 55 /* 56 * AD7992, AD7993, AD7994, AD7997 and AD7998 defines 57 */ 58 59 #define AD7998_FLTR BIT(3) 60 #define AD7998_ALERT_EN BIT(2) 61 #define AD7998_BUSY_ALERT BIT(1) 62 #define AD7998_BUSY_ALERT_POL BIT(0) 63 64 #define AD7998_CONV_RES_REG 0x0 65 #define AD7998_ALERT_STAT_REG 0x1 66 #define AD7998_CONF_REG 0x2 67 #define AD7998_CYCLE_TMR_REG 0x3 68 69 #define AD7998_DATALOW_REG(x) ((x) * 3 + 0x4) 70 #define AD7998_DATAHIGH_REG(x) ((x) * 3 + 0x5) 71 #define AD7998_HYST_REG(x) ((x) * 3 + 0x6) 72 73 #define AD7998_CYC_MASK GENMASK(2, 0) 74 #define AD7998_CYC_DIS 0x0 75 #define AD7998_CYC_TCONF_32 0x1 76 #define AD7998_CYC_TCONF_64 0x2 77 #define AD7998_CYC_TCONF_128 0x3 78 #define AD7998_CYC_TCONF_256 0x4 79 #define AD7998_CYC_TCONF_512 0x5 80 #define AD7998_CYC_TCONF_1024 0x6 81 #define AD7998_CYC_TCONF_2048 0x7 82 83 #define AD7998_ALERT_STAT_CLEAR 0xFF 84 85 /* 86 * AD7997 and AD7997 defines 87 */ 88 89 #define AD7997_8_READ_SINGLE BIT(7) 90 #define AD7997_8_READ_SEQUENCE (BIT(6) | BIT(5) | BIT(4)) 91 92 enum { 93 ad7991, 94 ad7995, 95 ad7999, 96 ad7992, 97 ad7993, 98 ad7994, 99 ad7997, 100 ad7998 101 }; 102 103 /** 104 * struct ad799x_chip_config - chip specific information 105 * @channel: channel specification 106 * @default_config: device default configuration 107 * @info: pointer to iio_info struct 108 */ 109 struct ad799x_chip_config { 110 const struct iio_chan_spec channel[9]; 111 u16 default_config; 112 const struct iio_info *info; 113 }; 114 115 /** 116 * struct ad799x_chip_info - chip specific information 117 * @num_channels: number of channels 118 * @noirq_config: device configuration w/o IRQ 119 * @irq_config: device configuration w/IRQ 120 */ 121 struct ad799x_chip_info { 122 int num_channels; 123 const struct ad799x_chip_config noirq_config; 124 const struct ad799x_chip_config irq_config; 125 }; 126 127 struct ad799x_state { 128 struct i2c_client *client; 129 const struct ad799x_chip_config *chip_config; 130 struct regulator *reg; 131 struct regulator *vref; 132 unsigned id; 133 u16 config; 134 135 u8 *rx_buf; 136 unsigned int transfer_size; 137 }; 138 139 static int ad799x_write_config(struct ad799x_state *st, u16 val) 140 { 141 switch (st->id) { 142 case ad7997: 143 case ad7998: 144 return i2c_smbus_write_word_swapped(st->client, AD7998_CONF_REG, 145 val); 146 case ad7992: 147 case ad7993: 148 case ad7994: 149 return i2c_smbus_write_byte_data(st->client, AD7998_CONF_REG, 150 val); 151 default: 152 /* Will be written when doing a conversion */ 153 st->config = val; 154 return 0; 155 } 156 } 157 158 static int ad799x_read_config(struct ad799x_state *st) 159 { 160 switch (st->id) { 161 case ad7997: 162 case ad7998: 163 return i2c_smbus_read_word_swapped(st->client, AD7998_CONF_REG); 164 case ad7992: 165 case ad7993: 166 case ad7994: 167 return i2c_smbus_read_byte_data(st->client, AD7998_CONF_REG); 168 default: 169 /* No readback support */ 170 return st->config; 171 } 172 } 173 174 /** 175 * ad799x_trigger_handler() bh of trigger launched polling to ring buffer 176 * 177 * Currently there is no option in this driver to disable the saving of 178 * timestamps within the ring. 179 **/ 180 static irqreturn_t ad799x_trigger_handler(int irq, void *p) 181 { 182 struct iio_poll_func *pf = p; 183 struct iio_dev *indio_dev = pf->indio_dev; 184 struct ad799x_state *st = iio_priv(indio_dev); 185 int b_sent; 186 u8 cmd; 187 188 switch (st->id) { 189 case ad7991: 190 case ad7995: 191 case ad7999: 192 cmd = st->config | 193 (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT); 194 break; 195 case ad7992: 196 case ad7993: 197 case ad7994: 198 cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) | 199 AD7998_CONV_RES_REG; 200 break; 201 case ad7997: 202 case ad7998: 203 cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG; 204 break; 205 default: 206 cmd = 0; 207 } 208 209 b_sent = i2c_smbus_read_i2c_block_data(st->client, 210 cmd, st->transfer_size, st->rx_buf); 211 if (b_sent < 0) 212 goto out; 213 214 iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf, 215 iio_get_time_ns()); 216 out: 217 iio_trigger_notify_done(indio_dev->trig); 218 219 return IRQ_HANDLED; 220 } 221 222 static int ad799x_update_scan_mode(struct iio_dev *indio_dev, 223 const unsigned long *scan_mask) 224 { 225 struct ad799x_state *st = iio_priv(indio_dev); 226 227 kfree(st->rx_buf); 228 st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL); 229 if (!st->rx_buf) 230 return -ENOMEM; 231 232 st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2; 233 234 switch (st->id) { 235 case ad7992: 236 case ad7993: 237 case ad7994: 238 case ad7997: 239 case ad7998: 240 st->config &= ~(GENMASK(7, 0) << AD799X_CHANNEL_SHIFT); 241 st->config |= (*scan_mask << AD799X_CHANNEL_SHIFT); 242 return ad799x_write_config(st, st->config); 243 default: 244 return 0; 245 } 246 } 247 248 static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch) 249 { 250 u8 cmd; 251 252 switch (st->id) { 253 case ad7991: 254 case ad7995: 255 case ad7999: 256 cmd = st->config | (BIT(ch) << AD799X_CHANNEL_SHIFT); 257 break; 258 case ad7992: 259 case ad7993: 260 case ad7994: 261 cmd = BIT(ch) << AD799X_CHANNEL_SHIFT; 262 break; 263 case ad7997: 264 case ad7998: 265 cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE; 266 break; 267 default: 268 return -EINVAL; 269 } 270 271 return i2c_smbus_read_word_swapped(st->client, cmd); 272 } 273 274 static int ad799x_read_raw(struct iio_dev *indio_dev, 275 struct iio_chan_spec const *chan, 276 int *val, 277 int *val2, 278 long m) 279 { 280 int ret; 281 struct ad799x_state *st = iio_priv(indio_dev); 282 283 switch (m) { 284 case IIO_CHAN_INFO_RAW: 285 mutex_lock(&indio_dev->mlock); 286 if (iio_buffer_enabled(indio_dev)) 287 ret = -EBUSY; 288 else 289 ret = ad799x_scan_direct(st, chan->scan_index); 290 mutex_unlock(&indio_dev->mlock); 291 292 if (ret < 0) 293 return ret; 294 *val = (ret >> chan->scan_type.shift) & 295 GENMASK(chan->scan_type.realbits - 1, 0); 296 return IIO_VAL_INT; 297 case IIO_CHAN_INFO_SCALE: 298 ret = regulator_get_voltage(st->vref); 299 if (ret < 0) 300 return ret; 301 *val = ret / 1000; 302 *val2 = chan->scan_type.realbits; 303 return IIO_VAL_FRACTIONAL_LOG2; 304 } 305 return -EINVAL; 306 } 307 static const unsigned int ad7998_frequencies[] = { 308 [AD7998_CYC_DIS] = 0, 309 [AD7998_CYC_TCONF_32] = 15625, 310 [AD7998_CYC_TCONF_64] = 7812, 311 [AD7998_CYC_TCONF_128] = 3906, 312 [AD7998_CYC_TCONF_512] = 976, 313 [AD7998_CYC_TCONF_1024] = 488, 314 [AD7998_CYC_TCONF_2048] = 244, 315 }; 316 317 static ssize_t ad799x_read_frequency(struct device *dev, 318 struct device_attribute *attr, 319 char *buf) 320 { 321 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 322 struct ad799x_state *st = iio_priv(indio_dev); 323 324 int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG); 325 if (ret < 0) 326 return ret; 327 328 return sprintf(buf, "%u\n", ad7998_frequencies[ret & AD7998_CYC_MASK]); 329 } 330 331 static ssize_t ad799x_write_frequency(struct device *dev, 332 struct device_attribute *attr, 333 const char *buf, 334 size_t len) 335 { 336 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 337 struct ad799x_state *st = iio_priv(indio_dev); 338 339 long val; 340 int ret, i; 341 342 ret = kstrtol(buf, 10, &val); 343 if (ret) 344 return ret; 345 346 mutex_lock(&indio_dev->mlock); 347 ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG); 348 if (ret < 0) 349 goto error_ret_mutex; 350 /* Wipe the bits clean */ 351 ret &= ~AD7998_CYC_MASK; 352 353 for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++) 354 if (val == ad7998_frequencies[i]) 355 break; 356 if (i == ARRAY_SIZE(ad7998_frequencies)) { 357 ret = -EINVAL; 358 goto error_ret_mutex; 359 } 360 361 ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG, 362 ret | i); 363 if (ret < 0) 364 goto error_ret_mutex; 365 ret = len; 366 367 error_ret_mutex: 368 mutex_unlock(&indio_dev->mlock); 369 370 return ret; 371 } 372 373 static int ad799x_read_event_config(struct iio_dev *indio_dev, 374 const struct iio_chan_spec *chan, 375 enum iio_event_type type, 376 enum iio_event_direction dir) 377 { 378 struct ad799x_state *st = iio_priv(indio_dev); 379 380 if (!(st->config & AD7998_ALERT_EN)) 381 return 0; 382 383 if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index)) 384 return 1; 385 386 return 0; 387 } 388 389 static int ad799x_write_event_config(struct iio_dev *indio_dev, 390 const struct iio_chan_spec *chan, 391 enum iio_event_type type, 392 enum iio_event_direction dir, 393 int state) 394 { 395 struct ad799x_state *st = iio_priv(indio_dev); 396 int ret; 397 398 mutex_lock(&indio_dev->mlock); 399 if (iio_buffer_enabled(indio_dev)) { 400 ret = -EBUSY; 401 goto done; 402 } 403 404 if (state) 405 st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT; 406 else 407 st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT); 408 409 if (st->config >> AD799X_CHANNEL_SHIFT) 410 st->config |= AD7998_ALERT_EN; 411 else 412 st->config &= ~AD7998_ALERT_EN; 413 414 ret = ad799x_write_config(st, st->config); 415 416 done: 417 mutex_unlock(&indio_dev->mlock); 418 419 return ret; 420 } 421 422 static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan, 423 enum iio_event_direction dir, 424 enum iio_event_info info) 425 { 426 switch (info) { 427 case IIO_EV_INFO_VALUE: 428 if (dir == IIO_EV_DIR_FALLING) 429 return AD7998_DATALOW_REG(chan->channel); 430 else 431 return AD7998_DATAHIGH_REG(chan->channel); 432 case IIO_EV_INFO_HYSTERESIS: 433 return AD7998_HYST_REG(chan->channel); 434 default: 435 return -EINVAL; 436 } 437 438 return 0; 439 } 440 441 static int ad799x_write_event_value(struct iio_dev *indio_dev, 442 const struct iio_chan_spec *chan, 443 enum iio_event_type type, 444 enum iio_event_direction dir, 445 enum iio_event_info info, 446 int val, int val2) 447 { 448 int ret; 449 struct ad799x_state *st = iio_priv(indio_dev); 450 451 if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0)) 452 return -EINVAL; 453 454 mutex_lock(&indio_dev->mlock); 455 ret = i2c_smbus_write_word_swapped(st->client, 456 ad799x_threshold_reg(chan, dir, info), 457 val << chan->scan_type.shift); 458 mutex_unlock(&indio_dev->mlock); 459 460 return ret; 461 } 462 463 static int ad799x_read_event_value(struct iio_dev *indio_dev, 464 const struct iio_chan_spec *chan, 465 enum iio_event_type type, 466 enum iio_event_direction dir, 467 enum iio_event_info info, 468 int *val, int *val2) 469 { 470 int ret; 471 struct ad799x_state *st = iio_priv(indio_dev); 472 473 mutex_lock(&indio_dev->mlock); 474 ret = i2c_smbus_read_word_swapped(st->client, 475 ad799x_threshold_reg(chan, dir, info)); 476 mutex_unlock(&indio_dev->mlock); 477 if (ret < 0) 478 return ret; 479 *val = (ret >> chan->scan_type.shift) & 480 GENMASK(chan->scan_type.realbits - 1 , 0); 481 482 return IIO_VAL_INT; 483 } 484 485 static irqreturn_t ad799x_event_handler(int irq, void *private) 486 { 487 struct iio_dev *indio_dev = private; 488 struct ad799x_state *st = iio_priv(private); 489 int i, ret; 490 491 ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG); 492 if (ret <= 0) 493 goto done; 494 495 if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG, 496 AD7998_ALERT_STAT_CLEAR) < 0) 497 goto done; 498 499 for (i = 0; i < 8; i++) { 500 if (ret & BIT(i)) 501 iio_push_event(indio_dev, 502 i & 0x1 ? 503 IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 504 (i >> 1), 505 IIO_EV_TYPE_THRESH, 506 IIO_EV_DIR_RISING) : 507 IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 508 (i >> 1), 509 IIO_EV_TYPE_THRESH, 510 IIO_EV_DIR_FALLING), 511 iio_get_time_ns()); 512 } 513 514 done: 515 return IRQ_HANDLED; 516 } 517 518 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, 519 ad799x_read_frequency, 520 ad799x_write_frequency); 521 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0"); 522 523 static struct attribute *ad799x_event_attributes[] = { 524 &iio_dev_attr_sampling_frequency.dev_attr.attr, 525 &iio_const_attr_sampling_frequency_available.dev_attr.attr, 526 NULL, 527 }; 528 529 static struct attribute_group ad799x_event_attrs_group = { 530 .attrs = ad799x_event_attributes, 531 .name = "events", 532 }; 533 534 static const struct iio_info ad7991_info = { 535 .read_raw = &ad799x_read_raw, 536 .driver_module = THIS_MODULE, 537 }; 538 539 static const struct iio_info ad7993_4_7_8_noirq_info = { 540 .read_raw = &ad799x_read_raw, 541 .driver_module = THIS_MODULE, 542 .update_scan_mode = ad799x_update_scan_mode, 543 }; 544 545 static const struct iio_info ad7993_4_7_8_irq_info = { 546 .read_raw = &ad799x_read_raw, 547 .event_attrs = &ad799x_event_attrs_group, 548 .read_event_config = &ad799x_read_event_config, 549 .write_event_config = &ad799x_write_event_config, 550 .read_event_value = &ad799x_read_event_value, 551 .write_event_value = &ad799x_write_event_value, 552 .driver_module = THIS_MODULE, 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 struct ad799x_state *st; 778 struct iio_dev *indio_dev; 779 const struct ad799x_chip_info *chip_info = 780 &ad799x_chip_info_tbl[id->driver_data]; 781 782 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st)); 783 if (indio_dev == NULL) 784 return -ENOMEM; 785 786 st = iio_priv(indio_dev); 787 /* this is only used for device removal purposes */ 788 i2c_set_clientdata(client, indio_dev); 789 790 st->id = id->driver_data; 791 if (client->irq > 0 && chip_info->irq_config.info) 792 st->chip_config = &chip_info->irq_config; 793 else 794 st->chip_config = &chip_info->noirq_config; 795 796 /* TODO: Add pdata options for filtering and bit delay */ 797 798 st->reg = devm_regulator_get(&client->dev, "vcc"); 799 if (IS_ERR(st->reg)) 800 return PTR_ERR(st->reg); 801 ret = regulator_enable(st->reg); 802 if (ret) 803 return ret; 804 st->vref = devm_regulator_get(&client->dev, "vref"); 805 if (IS_ERR(st->vref)) { 806 ret = PTR_ERR(st->vref); 807 goto error_disable_reg; 808 } 809 ret = regulator_enable(st->vref); 810 if (ret) 811 goto error_disable_reg; 812 813 st->client = client; 814 815 indio_dev->dev.parent = &client->dev; 816 indio_dev->name = id->name; 817 indio_dev->info = st->chip_config->info; 818 819 indio_dev->modes = INDIO_DIRECT_MODE; 820 indio_dev->channels = st->chip_config->channel; 821 indio_dev->num_channels = chip_info->num_channels; 822 823 ret = ad799x_write_config(st, st->chip_config->default_config); 824 if (ret < 0) 825 goto error_disable_reg; 826 ret = ad799x_read_config(st); 827 if (ret < 0) 828 goto error_disable_reg; 829 st->config = ret; 830 831 ret = iio_triggered_buffer_setup(indio_dev, NULL, 832 &ad799x_trigger_handler, NULL); 833 if (ret) 834 goto error_disable_vref; 835 836 if (client->irq > 0) { 837 ret = devm_request_threaded_irq(&client->dev, 838 client->irq, 839 NULL, 840 ad799x_event_handler, 841 IRQF_TRIGGER_FALLING | 842 IRQF_ONESHOT, 843 client->name, 844 indio_dev); 845 if (ret) 846 goto error_cleanup_ring; 847 } 848 ret = iio_device_register(indio_dev); 849 if (ret) 850 goto error_cleanup_ring; 851 852 return 0; 853 854 error_cleanup_ring: 855 iio_triggered_buffer_cleanup(indio_dev); 856 error_disable_vref: 857 regulator_disable(st->vref); 858 error_disable_reg: 859 regulator_disable(st->reg); 860 861 return ret; 862 } 863 864 static int ad799x_remove(struct i2c_client *client) 865 { 866 struct iio_dev *indio_dev = i2c_get_clientdata(client); 867 struct ad799x_state *st = iio_priv(indio_dev); 868 869 iio_device_unregister(indio_dev); 870 871 iio_triggered_buffer_cleanup(indio_dev); 872 regulator_disable(st->vref); 873 regulator_disable(st->reg); 874 kfree(st->rx_buf); 875 876 return 0; 877 } 878 879 static const struct i2c_device_id ad799x_id[] = { 880 { "ad7991", ad7991 }, 881 { "ad7995", ad7995 }, 882 { "ad7999", ad7999 }, 883 { "ad7992", ad7992 }, 884 { "ad7993", ad7993 }, 885 { "ad7994", ad7994 }, 886 { "ad7997", ad7997 }, 887 { "ad7998", ad7998 }, 888 {} 889 }; 890 891 MODULE_DEVICE_TABLE(i2c, ad799x_id); 892 893 static struct i2c_driver ad799x_driver = { 894 .driver = { 895 .name = "ad799x", 896 }, 897 .probe = ad799x_probe, 898 .remove = ad799x_remove, 899 .id_table = ad799x_id, 900 }; 901 module_i2c_driver(ad799x_driver); 902 903 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); 904 MODULE_DESCRIPTION("Analog Devices AD799x ADC"); 905 MODULE_LICENSE("GPL v2"); 906