1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * AD7785/AD7792/AD7793/AD7794/AD7795 SPI ADC driver 4 * 5 * Copyright 2011-2012 Analog Devices Inc. 6 */ 7 8 #include <linux/interrupt.h> 9 #include <linux/device.h> 10 #include <linux/kernel.h> 11 #include <linux/slab.h> 12 #include <linux/sysfs.h> 13 #include <linux/spi/spi.h> 14 #include <linux/regulator/consumer.h> 15 #include <linux/err.h> 16 #include <linux/sched.h> 17 #include <linux/delay.h> 18 #include <linux/module.h> 19 20 #include <linux/iio/iio.h> 21 #include <linux/iio/sysfs.h> 22 #include <linux/iio/buffer.h> 23 #include <linux/iio/trigger.h> 24 #include <linux/iio/trigger_consumer.h> 25 #include <linux/iio/triggered_buffer.h> 26 #include <linux/iio/adc/ad_sigma_delta.h> 27 #include <linux/platform_data/ad7793.h> 28 29 /* Registers */ 30 #define AD7793_REG_COMM 0 /* Communications Register (WO, 8-bit) */ 31 #define AD7793_REG_STAT 0 /* Status Register (RO, 8-bit) */ 32 #define AD7793_REG_MODE 1 /* Mode Register (RW, 16-bit */ 33 #define AD7793_REG_CONF 2 /* Configuration Register (RW, 16-bit) */ 34 #define AD7793_REG_DATA 3 /* Data Register (RO, 16-/24-bit) */ 35 #define AD7793_REG_ID 4 /* ID Register (RO, 8-bit) */ 36 #define AD7793_REG_IO 5 /* IO Register (RO, 8-bit) */ 37 #define AD7793_REG_OFFSET 6 /* Offset Register (RW, 16-bit 38 * (AD7792)/24-bit (AD7793)) */ 39 #define AD7793_REG_FULLSALE 7 /* Full-Scale Register 40 * (RW, 16-bit (AD7792)/24-bit (AD7793)) */ 41 42 /* Communications Register Bit Designations (AD7793_REG_COMM) */ 43 #define AD7793_COMM_WEN (1 << 7) /* Write Enable */ 44 #define AD7793_COMM_WRITE (0 << 6) /* Write Operation */ 45 #define AD7793_COMM_READ (1 << 6) /* Read Operation */ 46 #define AD7793_COMM_ADDR(x) (((x) & 0x7) << 3) /* Register Address */ 47 #define AD7793_COMM_CREAD (1 << 2) /* Continuous Read of Data Register */ 48 49 /* Status Register Bit Designations (AD7793_REG_STAT) */ 50 #define AD7793_STAT_RDY (1 << 7) /* Ready */ 51 #define AD7793_STAT_ERR (1 << 6) /* Error (Overrange, Underrange) */ 52 #define AD7793_STAT_CH3 (1 << 2) /* Channel 3 */ 53 #define AD7793_STAT_CH2 (1 << 1) /* Channel 2 */ 54 #define AD7793_STAT_CH1 (1 << 0) /* Channel 1 */ 55 56 /* Mode Register Bit Designations (AD7793_REG_MODE) */ 57 #define AD7793_MODE_SEL(x) (((x) & 0x7) << 13) /* Operation Mode Select */ 58 #define AD7793_MODE_SEL_MASK (0x7 << 13) /* Operation Mode Select mask */ 59 #define AD7793_MODE_CLKSRC(x) (((x) & 0x3) << 6) /* ADC Clock Source Select */ 60 #define AD7793_MODE_RATE(x) ((x) & 0xF) /* Filter Update Rate Select */ 61 62 #define AD7793_MODE_CONT 0 /* Continuous Conversion Mode */ 63 #define AD7793_MODE_SINGLE 1 /* Single Conversion Mode */ 64 #define AD7793_MODE_IDLE 2 /* Idle Mode */ 65 #define AD7793_MODE_PWRDN 3 /* Power-Down Mode */ 66 #define AD7793_MODE_CAL_INT_ZERO 4 /* Internal Zero-Scale Calibration */ 67 #define AD7793_MODE_CAL_INT_FULL 5 /* Internal Full-Scale Calibration */ 68 #define AD7793_MODE_CAL_SYS_ZERO 6 /* System Zero-Scale Calibration */ 69 #define AD7793_MODE_CAL_SYS_FULL 7 /* System Full-Scale Calibration */ 70 71 #define AD7793_CLK_INT 0 /* Internal 64 kHz Clock not 72 * available at the CLK pin */ 73 #define AD7793_CLK_INT_CO 1 /* Internal 64 kHz Clock available 74 * at the CLK pin */ 75 #define AD7793_CLK_EXT 2 /* External 64 kHz Clock */ 76 #define AD7793_CLK_EXT_DIV2 3 /* External Clock divided by 2 */ 77 78 /* Configuration Register Bit Designations (AD7793_REG_CONF) */ 79 #define AD7793_CONF_VBIAS(x) (((x) & 0x3) << 14) /* Bias Voltage 80 * Generator Enable */ 81 #define AD7793_CONF_BO_EN (1 << 13) /* Burnout Current Enable */ 82 #define AD7793_CONF_UNIPOLAR (1 << 12) /* Unipolar/Bipolar Enable */ 83 #define AD7793_CONF_BOOST (1 << 11) /* Boost Enable */ 84 #define AD7793_CONF_GAIN(x) (((x) & 0x7) << 8) /* Gain Select */ 85 #define AD7793_CONF_REFSEL(x) ((x) << 6) /* INT/EXT Reference Select */ 86 #define AD7793_CONF_BUF (1 << 4) /* Buffered Mode Enable */ 87 #define AD7793_CONF_CHAN(x) ((x) & 0xf) /* Channel select */ 88 #define AD7793_CONF_CHAN_MASK 0xf /* Channel select mask */ 89 90 #define AD7793_CH_AIN1P_AIN1M 0 /* AIN1(+) - AIN1(-) */ 91 #define AD7793_CH_AIN2P_AIN2M 1 /* AIN2(+) - AIN2(-) */ 92 #define AD7793_CH_AIN3P_AIN3M 2 /* AIN3(+) - AIN3(-) */ 93 #define AD7793_CH_AIN1M_AIN1M 3 /* AIN1(-) - AIN1(-) */ 94 #define AD7793_CH_TEMP 6 /* Temp Sensor */ 95 #define AD7793_CH_AVDD_MONITOR 7 /* AVDD Monitor */ 96 97 #define AD7795_CH_AIN4P_AIN4M 4 /* AIN4(+) - AIN4(-) */ 98 #define AD7795_CH_AIN5P_AIN5M 5 /* AIN5(+) - AIN5(-) */ 99 #define AD7795_CH_AIN6P_AIN6M 6 /* AIN6(+) - AIN6(-) */ 100 #define AD7795_CH_AIN1M_AIN1M 8 /* AIN1(-) - AIN1(-) */ 101 102 /* ID Register Bit Designations (AD7793_REG_ID) */ 103 #define AD7785_ID 0x3 104 #define AD7792_ID 0xA 105 #define AD7793_ID 0xB 106 #define AD7794_ID 0xF 107 #define AD7795_ID 0xF 108 #define AD7796_ID 0xA 109 #define AD7797_ID 0xB 110 #define AD7798_ID 0x8 111 #define AD7799_ID 0x9 112 #define AD7793_ID_MASK 0xF 113 114 /* IO (Excitation Current Sources) Register Bit Designations (AD7793_REG_IO) */ 115 #define AD7793_IO_IEXC1_IOUT1_IEXC2_IOUT2 0 /* IEXC1 connect to IOUT1, 116 * IEXC2 connect to IOUT2 */ 117 #define AD7793_IO_IEXC1_IOUT2_IEXC2_IOUT1 1 /* IEXC1 connect to IOUT2, 118 * IEXC2 connect to IOUT1 */ 119 #define AD7793_IO_IEXC1_IEXC2_IOUT1 2 /* Both current sources 120 * IEXC1,2 connect to IOUT1 */ 121 #define AD7793_IO_IEXC1_IEXC2_IOUT2 3 /* Both current sources 122 * IEXC1,2 connect to IOUT2 */ 123 124 #define AD7793_IO_IXCEN_10uA (1 << 0) /* Excitation Current 10uA */ 125 #define AD7793_IO_IXCEN_210uA (2 << 0) /* Excitation Current 210uA */ 126 #define AD7793_IO_IXCEN_1mA (3 << 0) /* Excitation Current 1mA */ 127 128 /* NOTE: 129 * The AD7792/AD7793 features a dual use data out ready DOUT/RDY output. 130 * In order to avoid contentions on the SPI bus, it's therefore necessary 131 * to use spi bus locking. 132 * 133 * The DOUT/RDY output must also be wired to an interrupt capable GPIO. 134 */ 135 136 #define AD7793_FLAG_HAS_CLKSEL BIT(0) 137 #define AD7793_FLAG_HAS_REFSEL BIT(1) 138 #define AD7793_FLAG_HAS_VBIAS BIT(2) 139 #define AD7793_HAS_EXITATION_CURRENT BIT(3) 140 #define AD7793_FLAG_HAS_GAIN BIT(4) 141 #define AD7793_FLAG_HAS_BUFFER BIT(5) 142 143 struct ad7793_chip_info { 144 unsigned int id; 145 const struct iio_chan_spec *channels; 146 unsigned int num_channels; 147 unsigned int flags; 148 149 const struct iio_info *iio_info; 150 const u16 *sample_freq_avail; 151 }; 152 153 struct ad7793_state { 154 const struct ad7793_chip_info *chip_info; 155 u16 int_vref_mv; 156 u16 mode; 157 u16 conf; 158 u32 scale_avail[8][2]; 159 160 struct ad_sigma_delta sd; 161 162 }; 163 164 enum ad7793_supported_device_ids { 165 ID_AD7785, 166 ID_AD7792, 167 ID_AD7793, 168 ID_AD7794, 169 ID_AD7795, 170 ID_AD7796, 171 ID_AD7797, 172 ID_AD7798, 173 ID_AD7799, 174 }; 175 176 static struct ad7793_state *ad_sigma_delta_to_ad7793(struct ad_sigma_delta *sd) 177 { 178 return container_of(sd, struct ad7793_state, sd); 179 } 180 181 static int ad7793_set_channel(struct ad_sigma_delta *sd, unsigned int channel) 182 { 183 struct ad7793_state *st = ad_sigma_delta_to_ad7793(sd); 184 185 st->conf &= ~AD7793_CONF_CHAN_MASK; 186 st->conf |= AD7793_CONF_CHAN(channel); 187 188 return ad_sd_write_reg(&st->sd, AD7793_REG_CONF, 2, st->conf); 189 } 190 191 static int ad7793_set_mode(struct ad_sigma_delta *sd, 192 enum ad_sigma_delta_mode mode) 193 { 194 struct ad7793_state *st = ad_sigma_delta_to_ad7793(sd); 195 196 st->mode &= ~AD7793_MODE_SEL_MASK; 197 st->mode |= AD7793_MODE_SEL(mode); 198 199 return ad_sd_write_reg(&st->sd, AD7793_REG_MODE, 2, st->mode); 200 } 201 202 static const struct ad_sigma_delta_info ad7793_sigma_delta_info = { 203 .set_channel = ad7793_set_channel, 204 .set_mode = ad7793_set_mode, 205 .has_registers = true, 206 .addr_shift = 3, 207 .read_mask = BIT(6), 208 .irq_flags = IRQF_TRIGGER_FALLING, 209 .num_resetclks = 32, 210 }; 211 212 static const struct ad_sd_calib_data ad7793_calib_arr[6] = { 213 {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN1P_AIN1M}, 214 {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN1P_AIN1M}, 215 {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN2P_AIN2M}, 216 {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN2P_AIN2M}, 217 {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN3P_AIN3M}, 218 {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN3P_AIN3M} 219 }; 220 221 static int ad7793_calibrate_all(struct ad7793_state *st) 222 { 223 return ad_sd_calibrate_all(&st->sd, ad7793_calib_arr, 224 ARRAY_SIZE(ad7793_calib_arr)); 225 } 226 227 static int ad7793_check_platform_data(struct ad7793_state *st, 228 const struct ad7793_platform_data *pdata) 229 { 230 if ((pdata->current_source_direction == AD7793_IEXEC1_IEXEC2_IOUT1 || 231 pdata->current_source_direction == AD7793_IEXEC1_IEXEC2_IOUT2) && 232 ((pdata->exitation_current != AD7793_IX_10uA) && 233 (pdata->exitation_current != AD7793_IX_210uA))) 234 return -EINVAL; 235 236 if (!(st->chip_info->flags & AD7793_FLAG_HAS_CLKSEL) && 237 pdata->clock_src != AD7793_CLK_SRC_INT) 238 return -EINVAL; 239 240 if (!(st->chip_info->flags & AD7793_FLAG_HAS_REFSEL) && 241 pdata->refsel != AD7793_REFSEL_REFIN1) 242 return -EINVAL; 243 244 if (!(st->chip_info->flags & AD7793_FLAG_HAS_VBIAS) && 245 pdata->bias_voltage != AD7793_BIAS_VOLTAGE_DISABLED) 246 return -EINVAL; 247 248 if (!(st->chip_info->flags & AD7793_HAS_EXITATION_CURRENT) && 249 pdata->exitation_current != AD7793_IX_DISABLED) 250 return -EINVAL; 251 252 return 0; 253 } 254 255 static int ad7793_setup(struct iio_dev *indio_dev, 256 const struct ad7793_platform_data *pdata, 257 unsigned int vref_mv) 258 { 259 struct ad7793_state *st = iio_priv(indio_dev); 260 int i, ret; 261 unsigned long long scale_uv; 262 u32 id; 263 264 ret = ad7793_check_platform_data(st, pdata); 265 if (ret) 266 return ret; 267 268 /* reset the serial interface */ 269 ret = ad_sd_reset(&st->sd); 270 if (ret < 0) 271 goto out; 272 usleep_range(500, 2000); /* Wait for at least 500us */ 273 274 /* write/read test for device presence */ 275 ret = ad_sd_read_reg(&st->sd, AD7793_REG_ID, 1, &id); 276 if (ret) 277 goto out; 278 279 id &= AD7793_ID_MASK; 280 281 if (id != st->chip_info->id) { 282 ret = -ENODEV; 283 dev_err(&st->sd.spi->dev, "device ID query failed\n"); 284 goto out; 285 } 286 287 st->mode = AD7793_MODE_RATE(1); 288 st->conf = 0; 289 290 if (st->chip_info->flags & AD7793_FLAG_HAS_CLKSEL) 291 st->mode |= AD7793_MODE_CLKSRC(pdata->clock_src); 292 if (st->chip_info->flags & AD7793_FLAG_HAS_REFSEL) 293 st->conf |= AD7793_CONF_REFSEL(pdata->refsel); 294 if (st->chip_info->flags & AD7793_FLAG_HAS_VBIAS) 295 st->conf |= AD7793_CONF_VBIAS(pdata->bias_voltage); 296 if (pdata->buffered || !(st->chip_info->flags & AD7793_FLAG_HAS_BUFFER)) 297 st->conf |= AD7793_CONF_BUF; 298 if (pdata->boost_enable && 299 (st->chip_info->flags & AD7793_FLAG_HAS_VBIAS)) 300 st->conf |= AD7793_CONF_BOOST; 301 if (pdata->burnout_current) 302 st->conf |= AD7793_CONF_BO_EN; 303 if (pdata->unipolar) 304 st->conf |= AD7793_CONF_UNIPOLAR; 305 306 if (!(st->chip_info->flags & AD7793_FLAG_HAS_GAIN)) 307 st->conf |= AD7793_CONF_GAIN(7); 308 309 ret = ad7793_set_mode(&st->sd, AD_SD_MODE_IDLE); 310 if (ret) 311 goto out; 312 313 ret = ad7793_set_channel(&st->sd, 0); 314 if (ret) 315 goto out; 316 317 if (st->chip_info->flags & AD7793_HAS_EXITATION_CURRENT) { 318 ret = ad_sd_write_reg(&st->sd, AD7793_REG_IO, 1, 319 pdata->exitation_current | 320 (pdata->current_source_direction << 2)); 321 if (ret) 322 goto out; 323 } 324 325 ret = ad7793_calibrate_all(st); 326 if (ret) 327 goto out; 328 329 /* Populate available ADC input ranges */ 330 for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) { 331 scale_uv = ((u64)vref_mv * 100000000) 332 >> (st->chip_info->channels[0].scan_type.realbits - 333 (!!(st->conf & AD7793_CONF_UNIPOLAR) ? 0 : 1)); 334 scale_uv >>= i; 335 336 st->scale_avail[i][1] = do_div(scale_uv, 100000000) * 10; 337 st->scale_avail[i][0] = scale_uv; 338 } 339 340 return 0; 341 out: 342 dev_err(&st->sd.spi->dev, "setup failed\n"); 343 return ret; 344 } 345 346 static const u16 ad7793_sample_freq_avail[16] = {0, 470, 242, 123, 62, 50, 39, 347 33, 19, 17, 16, 12, 10, 8, 6, 4}; 348 349 static const u16 ad7797_sample_freq_avail[16] = {0, 0, 0, 123, 62, 50, 0, 350 33, 0, 17, 16, 12, 10, 8, 6, 4}; 351 352 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL( 353 "470 242 123 62 50 39 33 19 17 16 12 10 8 6 4"); 354 355 static IIO_CONST_ATTR_NAMED(sampling_frequency_available_ad7797, 356 sampling_frequency_available, "123 62 50 33 17 16 12 10 8 6 4"); 357 358 static int ad7793_read_avail(struct iio_dev *indio_dev, 359 struct iio_chan_spec const *chan, 360 const int **vals, int *type, int *length, 361 long mask) 362 { 363 struct ad7793_state *st = iio_priv(indio_dev); 364 365 switch (mask) { 366 case IIO_CHAN_INFO_SCALE: 367 *vals = (int *)st->scale_avail; 368 *type = IIO_VAL_INT_PLUS_NANO; 369 /* Values are stored in a 2D matrix */ 370 *length = ARRAY_SIZE(st->scale_avail) * 2; 371 372 return IIO_AVAIL_LIST; 373 default: 374 return -EINVAL; 375 } 376 } 377 378 static struct attribute *ad7793_attributes[] = { 379 &iio_const_attr_sampling_frequency_available.dev_attr.attr, 380 NULL 381 }; 382 383 static const struct attribute_group ad7793_attribute_group = { 384 .attrs = ad7793_attributes, 385 }; 386 387 static struct attribute *ad7797_attributes[] = { 388 &iio_const_attr_sampling_frequency_available_ad7797.dev_attr.attr, 389 NULL 390 }; 391 392 static const struct attribute_group ad7797_attribute_group = { 393 .attrs = ad7797_attributes, 394 }; 395 396 static int ad7793_read_raw(struct iio_dev *indio_dev, 397 struct iio_chan_spec const *chan, 398 int *val, 399 int *val2, 400 long m) 401 { 402 struct ad7793_state *st = iio_priv(indio_dev); 403 int ret; 404 unsigned long long scale_uv; 405 bool unipolar = !!(st->conf & AD7793_CONF_UNIPOLAR); 406 407 switch (m) { 408 case IIO_CHAN_INFO_RAW: 409 ret = ad_sigma_delta_single_conversion(indio_dev, chan, val); 410 if (ret < 0) 411 return ret; 412 413 return IIO_VAL_INT; 414 415 case IIO_CHAN_INFO_SCALE: 416 switch (chan->type) { 417 case IIO_VOLTAGE: 418 if (chan->differential) { 419 *val = st-> 420 scale_avail[(st->conf >> 8) & 0x7][0]; 421 *val2 = st-> 422 scale_avail[(st->conf >> 8) & 0x7][1]; 423 return IIO_VAL_INT_PLUS_NANO; 424 } 425 /* 1170mV / 2^23 * 6 */ 426 scale_uv = (1170ULL * 1000000000ULL * 6ULL); 427 break; 428 case IIO_TEMP: 429 /* 1170mV / 0.81 mV/C / 2^23 */ 430 scale_uv = 1444444444444444ULL; 431 break; 432 default: 433 return -EINVAL; 434 } 435 436 scale_uv >>= (chan->scan_type.realbits - (unipolar ? 0 : 1)); 437 *val = 0; 438 *val2 = scale_uv; 439 return IIO_VAL_INT_PLUS_NANO; 440 case IIO_CHAN_INFO_OFFSET: 441 if (!unipolar) 442 *val = -(1 << (chan->scan_type.realbits - 1)); 443 else 444 *val = 0; 445 446 /* Kelvin to Celsius */ 447 if (chan->type == IIO_TEMP) { 448 unsigned long long offset; 449 unsigned int shift; 450 451 shift = chan->scan_type.realbits - (unipolar ? 0 : 1); 452 offset = 273ULL << shift; 453 do_div(offset, 1444); 454 *val -= offset; 455 } 456 return IIO_VAL_INT; 457 case IIO_CHAN_INFO_SAMP_FREQ: 458 *val = st->chip_info 459 ->sample_freq_avail[AD7793_MODE_RATE(st->mode)]; 460 return IIO_VAL_INT; 461 } 462 return -EINVAL; 463 } 464 465 static int __ad7793_write_raw(struct iio_dev *indio_dev, 466 struct iio_chan_spec const *chan, 467 int val, int val2, long mask) 468 { 469 struct ad7793_state *st = iio_priv(indio_dev); 470 int i; 471 unsigned int tmp; 472 473 switch (mask) { 474 case IIO_CHAN_INFO_SCALE: 475 for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) { 476 if (val2 != st->scale_avail[i][1]) 477 continue; 478 479 tmp = st->conf; 480 st->conf &= ~AD7793_CONF_GAIN(-1); 481 st->conf |= AD7793_CONF_GAIN(i); 482 483 if (tmp == st->conf) 484 return 0; 485 486 ad_sd_write_reg(&st->sd, AD7793_REG_CONF, 487 sizeof(st->conf), st->conf); 488 ad7793_calibrate_all(st); 489 490 return 0; 491 } 492 return -EINVAL; 493 case IIO_CHAN_INFO_SAMP_FREQ: 494 if (!val) 495 return -EINVAL; 496 497 for (i = 0; i < 16; i++) 498 if (val == st->chip_info->sample_freq_avail[i]) 499 break; 500 501 if (i == 16) 502 return -EINVAL; 503 504 st->mode &= ~AD7793_MODE_RATE(-1); 505 st->mode |= AD7793_MODE_RATE(i); 506 ad_sd_write_reg(&st->sd, AD7793_REG_MODE, sizeof(st->mode), 507 st->mode); 508 return 0; 509 default: 510 return -EINVAL; 511 } 512 } 513 514 static int ad7793_write_raw(struct iio_dev *indio_dev, 515 struct iio_chan_spec const *chan, 516 int val, int val2, long mask) 517 { 518 int ret; 519 520 if (!iio_device_claim_direct(indio_dev)) 521 return -EBUSY; 522 523 ret = __ad7793_write_raw(indio_dev, chan, val, val2, mask); 524 525 iio_device_release_direct(indio_dev); 526 527 return ret; 528 } 529 530 static int ad7793_write_raw_get_fmt(struct iio_dev *indio_dev, 531 struct iio_chan_spec const *chan, 532 long mask) 533 { 534 return IIO_VAL_INT_PLUS_NANO; 535 } 536 537 static const struct iio_info ad7793_info = { 538 .read_raw = &ad7793_read_raw, 539 .write_raw = &ad7793_write_raw, 540 .write_raw_get_fmt = &ad7793_write_raw_get_fmt, 541 .read_avail = ad7793_read_avail, 542 .attrs = &ad7793_attribute_group, 543 .validate_trigger = ad_sd_validate_trigger, 544 }; 545 546 static const struct iio_info ad7797_info = { 547 .read_raw = &ad7793_read_raw, 548 .write_raw = &ad7793_write_raw, 549 .write_raw_get_fmt = &ad7793_write_raw_get_fmt, 550 .attrs = &ad7797_attribute_group, 551 .validate_trigger = ad_sd_validate_trigger, 552 }; 553 554 #define __AD7793_CHANNEL(_si, _channel1, _channel2, _address, _bits, \ 555 _storagebits, _shift, _extend_name, _type, _mask_type_av, _mask_all) \ 556 { \ 557 .type = (_type), \ 558 .differential = (_channel2 == -1 ? 0 : 1), \ 559 .indexed = 1, \ 560 .channel = (_channel1), \ 561 .channel2 = (_channel2), \ 562 .address = (_address), \ 563 .extend_name = (_extend_name), \ 564 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ 565 BIT(IIO_CHAN_INFO_OFFSET), \ 566 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ 567 .info_mask_shared_by_type_available = (_mask_type_av), \ 568 .info_mask_shared_by_all = _mask_all, \ 569 .scan_index = (_si), \ 570 .scan_type = { \ 571 .sign = 'u', \ 572 .realbits = (_bits), \ 573 .storagebits = (_storagebits), \ 574 .shift = (_shift), \ 575 .endianness = IIO_BE, \ 576 }, \ 577 } 578 579 #define AD7793_DIFF_CHANNEL(_si, _channel1, _channel2, _address, _bits, \ 580 _storagebits, _shift) \ 581 __AD7793_CHANNEL(_si, _channel1, _channel2, _address, _bits, \ 582 _storagebits, _shift, NULL, IIO_VOLTAGE, \ 583 BIT(IIO_CHAN_INFO_SCALE), \ 584 BIT(IIO_CHAN_INFO_SAMP_FREQ)) 585 586 #define AD7793_SHORTED_CHANNEL(_si, _channel, _address, _bits, \ 587 _storagebits, _shift) \ 588 __AD7793_CHANNEL(_si, _channel, _channel, _address, _bits, \ 589 _storagebits, _shift, "shorted", IIO_VOLTAGE, \ 590 BIT(IIO_CHAN_INFO_SCALE), \ 591 BIT(IIO_CHAN_INFO_SAMP_FREQ)) 592 593 #define AD7793_TEMP_CHANNEL(_si, _address, _bits, _storagebits, _shift) \ 594 __AD7793_CHANNEL(_si, 0, -1, _address, _bits, \ 595 _storagebits, _shift, NULL, IIO_TEMP, \ 596 0, \ 597 BIT(IIO_CHAN_INFO_SAMP_FREQ)) 598 599 #define AD7793_SUPPLY_CHANNEL(_si, _channel, _address, _bits, _storagebits, \ 600 _shift) \ 601 __AD7793_CHANNEL(_si, _channel, -1, _address, _bits, \ 602 _storagebits, _shift, "supply", IIO_VOLTAGE, \ 603 0, \ 604 BIT(IIO_CHAN_INFO_SAMP_FREQ)) 605 606 #define AD7797_DIFF_CHANNEL(_si, _channel1, _channel2, _address, _bits, \ 607 _storagebits, _shift) \ 608 __AD7793_CHANNEL(_si, _channel1, _channel2, _address, _bits, \ 609 _storagebits, _shift, NULL, IIO_VOLTAGE, \ 610 0, \ 611 BIT(IIO_CHAN_INFO_SAMP_FREQ)) 612 613 #define AD7797_SHORTED_CHANNEL(_si, _channel, _address, _bits, \ 614 _storagebits, _shift) \ 615 __AD7793_CHANNEL(_si, _channel, _channel, _address, _bits, \ 616 _storagebits, _shift, "shorted", IIO_VOLTAGE, \ 617 0, \ 618 BIT(IIO_CHAN_INFO_SAMP_FREQ)) 619 620 #define DECLARE_AD7793_CHANNELS(_name, _b, _sb, _s) \ 621 const struct iio_chan_spec _name##_channels[] = { \ 622 AD7793_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), (_s)), \ 623 AD7793_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), (_s)), \ 624 AD7793_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), (_s)), \ 625 AD7793_SHORTED_CHANNEL(3, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), (_s)), \ 626 AD7793_TEMP_CHANNEL(4, AD7793_CH_TEMP, (_b), (_sb), (_s)), \ 627 AD7793_SUPPLY_CHANNEL(5, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), (_s)), \ 628 IIO_CHAN_SOFT_TIMESTAMP(6), \ 629 } 630 631 #define DECLARE_AD7795_CHANNELS(_name, _b, _sb) \ 632 const struct iio_chan_spec _name##_channels[] = { \ 633 AD7793_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \ 634 AD7793_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), 0), \ 635 AD7793_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), 0), \ 636 AD7793_DIFF_CHANNEL(3, 3, 3, AD7795_CH_AIN4P_AIN4M, (_b), (_sb), 0), \ 637 AD7793_DIFF_CHANNEL(4, 4, 4, AD7795_CH_AIN5P_AIN5M, (_b), (_sb), 0), \ 638 AD7793_DIFF_CHANNEL(5, 5, 5, AD7795_CH_AIN6P_AIN6M, (_b), (_sb), 0), \ 639 AD7793_SHORTED_CHANNEL(6, 0, AD7795_CH_AIN1M_AIN1M, (_b), (_sb), 0), \ 640 AD7793_TEMP_CHANNEL(7, AD7793_CH_TEMP, (_b), (_sb), 0), \ 641 AD7793_SUPPLY_CHANNEL(8, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \ 642 IIO_CHAN_SOFT_TIMESTAMP(9), \ 643 } 644 645 #define DECLARE_AD7797_CHANNELS(_name, _b, _sb) \ 646 const struct iio_chan_spec _name##_channels[] = { \ 647 AD7797_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \ 648 AD7797_SHORTED_CHANNEL(1, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), 0), \ 649 AD7793_TEMP_CHANNEL(2, AD7793_CH_TEMP, (_b), (_sb), 0), \ 650 AD7793_SUPPLY_CHANNEL(3, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \ 651 IIO_CHAN_SOFT_TIMESTAMP(4), \ 652 } 653 654 #define DECLARE_AD7799_CHANNELS(_name, _b, _sb) \ 655 const struct iio_chan_spec _name##_channels[] = { \ 656 AD7793_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \ 657 AD7793_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), 0), \ 658 AD7793_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), 0), \ 659 AD7793_SHORTED_CHANNEL(3, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), 0), \ 660 AD7793_SUPPLY_CHANNEL(4, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \ 661 IIO_CHAN_SOFT_TIMESTAMP(5), \ 662 } 663 664 static DECLARE_AD7793_CHANNELS(ad7785, 20, 32, 4); 665 static DECLARE_AD7793_CHANNELS(ad7792, 16, 32, 0); 666 static DECLARE_AD7793_CHANNELS(ad7793, 24, 32, 0); 667 static DECLARE_AD7795_CHANNELS(ad7794, 16, 32); 668 static DECLARE_AD7795_CHANNELS(ad7795, 24, 32); 669 static DECLARE_AD7797_CHANNELS(ad7796, 16, 16); 670 static DECLARE_AD7797_CHANNELS(ad7797, 24, 32); 671 static DECLARE_AD7799_CHANNELS(ad7798, 16, 16); 672 static DECLARE_AD7799_CHANNELS(ad7799, 24, 32); 673 674 static const struct ad7793_chip_info ad7793_chip_info_tbl[] = { 675 [ID_AD7785] = { 676 .id = AD7785_ID, 677 .channels = ad7785_channels, 678 .num_channels = ARRAY_SIZE(ad7785_channels), 679 .iio_info = &ad7793_info, 680 .sample_freq_avail = ad7793_sample_freq_avail, 681 .flags = AD7793_FLAG_HAS_CLKSEL | 682 AD7793_FLAG_HAS_REFSEL | 683 AD7793_FLAG_HAS_VBIAS | 684 AD7793_HAS_EXITATION_CURRENT | 685 AD7793_FLAG_HAS_GAIN | 686 AD7793_FLAG_HAS_BUFFER, 687 }, 688 [ID_AD7792] = { 689 .id = AD7792_ID, 690 .channels = ad7792_channels, 691 .num_channels = ARRAY_SIZE(ad7792_channels), 692 .iio_info = &ad7793_info, 693 .sample_freq_avail = ad7793_sample_freq_avail, 694 .flags = AD7793_FLAG_HAS_CLKSEL | 695 AD7793_FLAG_HAS_REFSEL | 696 AD7793_FLAG_HAS_VBIAS | 697 AD7793_HAS_EXITATION_CURRENT | 698 AD7793_FLAG_HAS_GAIN | 699 AD7793_FLAG_HAS_BUFFER, 700 }, 701 [ID_AD7793] = { 702 .id = AD7793_ID, 703 .channels = ad7793_channels, 704 .num_channels = ARRAY_SIZE(ad7793_channels), 705 .iio_info = &ad7793_info, 706 .sample_freq_avail = ad7793_sample_freq_avail, 707 .flags = AD7793_FLAG_HAS_CLKSEL | 708 AD7793_FLAG_HAS_REFSEL | 709 AD7793_FLAG_HAS_VBIAS | 710 AD7793_HAS_EXITATION_CURRENT | 711 AD7793_FLAG_HAS_GAIN | 712 AD7793_FLAG_HAS_BUFFER, 713 }, 714 [ID_AD7794] = { 715 .id = AD7794_ID, 716 .channels = ad7794_channels, 717 .num_channels = ARRAY_SIZE(ad7794_channels), 718 .iio_info = &ad7793_info, 719 .sample_freq_avail = ad7793_sample_freq_avail, 720 .flags = AD7793_FLAG_HAS_CLKSEL | 721 AD7793_FLAG_HAS_REFSEL | 722 AD7793_FLAG_HAS_VBIAS | 723 AD7793_HAS_EXITATION_CURRENT | 724 AD7793_FLAG_HAS_GAIN | 725 AD7793_FLAG_HAS_BUFFER, 726 }, 727 [ID_AD7795] = { 728 .id = AD7795_ID, 729 .channels = ad7795_channels, 730 .num_channels = ARRAY_SIZE(ad7795_channels), 731 .iio_info = &ad7793_info, 732 .sample_freq_avail = ad7793_sample_freq_avail, 733 .flags = AD7793_FLAG_HAS_CLKSEL | 734 AD7793_FLAG_HAS_REFSEL | 735 AD7793_FLAG_HAS_VBIAS | 736 AD7793_HAS_EXITATION_CURRENT | 737 AD7793_FLAG_HAS_GAIN | 738 AD7793_FLAG_HAS_BUFFER, 739 }, 740 [ID_AD7796] = { 741 .id = AD7796_ID, 742 .channels = ad7796_channels, 743 .num_channels = ARRAY_SIZE(ad7796_channels), 744 .iio_info = &ad7797_info, 745 .sample_freq_avail = ad7797_sample_freq_avail, 746 .flags = AD7793_FLAG_HAS_CLKSEL, 747 }, 748 [ID_AD7797] = { 749 .id = AD7797_ID, 750 .channels = ad7797_channels, 751 .num_channels = ARRAY_SIZE(ad7797_channels), 752 .iio_info = &ad7797_info, 753 .sample_freq_avail = ad7797_sample_freq_avail, 754 .flags = AD7793_FLAG_HAS_CLKSEL, 755 }, 756 [ID_AD7798] = { 757 .id = AD7798_ID, 758 .channels = ad7798_channels, 759 .num_channels = ARRAY_SIZE(ad7798_channels), 760 .iio_info = &ad7793_info, 761 .sample_freq_avail = ad7793_sample_freq_avail, 762 .flags = AD7793_FLAG_HAS_GAIN | 763 AD7793_FLAG_HAS_BUFFER, 764 }, 765 [ID_AD7799] = { 766 .id = AD7799_ID, 767 .channels = ad7799_channels, 768 .num_channels = ARRAY_SIZE(ad7799_channels), 769 .iio_info = &ad7793_info, 770 .sample_freq_avail = ad7793_sample_freq_avail, 771 .flags = AD7793_FLAG_HAS_GAIN | 772 AD7793_FLAG_HAS_BUFFER, 773 }, 774 }; 775 776 static int ad7793_probe(struct spi_device *spi) 777 { 778 const struct ad7793_platform_data *pdata = dev_get_platdata(&spi->dev); 779 struct ad7793_state *st; 780 struct iio_dev *indio_dev; 781 int ret, vref_mv = 0; 782 783 if (!pdata) { 784 dev_err(&spi->dev, "no platform data?\n"); 785 return -ENODEV; 786 } 787 788 if (!spi->irq) { 789 dev_err(&spi->dev, "no IRQ?\n"); 790 return -ENODEV; 791 } 792 793 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); 794 if (indio_dev == NULL) 795 return -ENOMEM; 796 797 st = iio_priv(indio_dev); 798 799 ad_sd_init(&st->sd, indio_dev, spi, &ad7793_sigma_delta_info); 800 801 if (pdata->refsel != AD7793_REFSEL_INTERNAL) { 802 ret = devm_regulator_get_enable_read_voltage(&spi->dev, "refin"); 803 if (ret < 0) 804 return ret; 805 806 vref_mv = ret / 1000; 807 } else { 808 vref_mv = 1170; /* Build-in ref */ 809 } 810 811 st->chip_info = 812 &ad7793_chip_info_tbl[spi_get_device_id(spi)->driver_data]; 813 814 indio_dev->name = spi_get_device_id(spi)->name; 815 indio_dev->modes = INDIO_DIRECT_MODE; 816 indio_dev->channels = st->chip_info->channels; 817 indio_dev->num_channels = st->chip_info->num_channels; 818 indio_dev->info = st->chip_info->iio_info; 819 820 ret = devm_ad_sd_setup_buffer_and_trigger(&spi->dev, indio_dev); 821 if (ret) 822 return ret; 823 824 ret = ad7793_setup(indio_dev, pdata, vref_mv); 825 if (ret) 826 return ret; 827 828 return devm_iio_device_register(&spi->dev, indio_dev); 829 } 830 831 static const struct spi_device_id ad7793_id[] = { 832 { "ad7785", ID_AD7785 }, 833 { "ad7792", ID_AD7792 }, 834 { "ad7793", ID_AD7793 }, 835 { "ad7794", ID_AD7794 }, 836 { "ad7795", ID_AD7795 }, 837 { "ad7796", ID_AD7796 }, 838 { "ad7797", ID_AD7797 }, 839 { "ad7798", ID_AD7798 }, 840 { "ad7799", ID_AD7799 }, 841 { } 842 }; 843 MODULE_DEVICE_TABLE(spi, ad7793_id); 844 845 static struct spi_driver ad7793_driver = { 846 .driver = { 847 .name = "ad7793", 848 }, 849 .probe = ad7793_probe, 850 .id_table = ad7793_id, 851 }; 852 module_spi_driver(ad7793_driver); 853 854 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); 855 MODULE_DESCRIPTION("Analog Devices AD7793 and similar ADCs"); 856 MODULE_LICENSE("GPL v2"); 857 MODULE_IMPORT_NS("IIO_AD_SIGMA_DELTA"); 858