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 mode; 156 u16 conf; 157 u32 scale_avail[8][2]; 158 159 struct ad_sigma_delta sd; 160 161 }; 162 163 enum ad7793_supported_device_ids { 164 ID_AD7785, 165 ID_AD7792, 166 ID_AD7793, 167 ID_AD7794, 168 ID_AD7795, 169 ID_AD7796, 170 ID_AD7797, 171 ID_AD7798, 172 ID_AD7799, 173 }; 174 175 static struct ad7793_state *ad_sigma_delta_to_ad7793(struct ad_sigma_delta *sd) 176 { 177 return container_of(sd, struct ad7793_state, sd); 178 } 179 180 static int ad7793_set_channel(struct ad_sigma_delta *sd, unsigned int channel) 181 { 182 struct ad7793_state *st = ad_sigma_delta_to_ad7793(sd); 183 184 st->conf &= ~AD7793_CONF_CHAN_MASK; 185 st->conf |= AD7793_CONF_CHAN(channel); 186 187 return ad_sd_write_reg(&st->sd, AD7793_REG_CONF, 2, st->conf); 188 } 189 190 static int ad7793_set_mode(struct ad_sigma_delta *sd, 191 enum ad_sigma_delta_mode mode) 192 { 193 struct ad7793_state *st = ad_sigma_delta_to_ad7793(sd); 194 195 st->mode &= ~AD7793_MODE_SEL_MASK; 196 st->mode |= AD7793_MODE_SEL(mode); 197 198 return ad_sd_write_reg(&st->sd, AD7793_REG_MODE, 2, st->mode); 199 } 200 201 static const struct ad_sigma_delta_info ad7793_sigma_delta_info = { 202 .set_channel = ad7793_set_channel, 203 .set_mode = ad7793_set_mode, 204 .has_registers = true, 205 .addr_shift = 3, 206 .read_mask = BIT(6), 207 .irq_flags = IRQF_TRIGGER_FALLING, 208 .num_resetclks = 32, 209 }; 210 211 static const struct ad_sd_calib_data ad7793_calib_arr[6] = { 212 {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN1P_AIN1M}, 213 {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN1P_AIN1M}, 214 {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN2P_AIN2M}, 215 {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN2P_AIN2M}, 216 {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN3P_AIN3M}, 217 {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN3P_AIN3M} 218 }; 219 220 static int ad7793_calibrate_all(struct ad7793_state *st) 221 { 222 return ad_sd_calibrate_all(&st->sd, ad7793_calib_arr, 223 ARRAY_SIZE(ad7793_calib_arr)); 224 } 225 226 static int ad7793_check_platform_data(struct ad7793_state *st, 227 const struct ad7793_platform_data *pdata) 228 { 229 if ((pdata->current_source_direction == AD7793_IEXEC1_IEXEC2_IOUT1 || 230 pdata->current_source_direction == AD7793_IEXEC1_IEXEC2_IOUT2) && 231 ((pdata->exitation_current != AD7793_IX_10uA) && 232 (pdata->exitation_current != AD7793_IX_210uA))) 233 return -EINVAL; 234 235 if (!(st->chip_info->flags & AD7793_FLAG_HAS_CLKSEL) && 236 pdata->clock_src != AD7793_CLK_SRC_INT) 237 return -EINVAL; 238 239 if (!(st->chip_info->flags & AD7793_FLAG_HAS_REFSEL) && 240 pdata->refsel != AD7793_REFSEL_REFIN1) 241 return -EINVAL; 242 243 if (!(st->chip_info->flags & AD7793_FLAG_HAS_VBIAS) && 244 pdata->bias_voltage != AD7793_BIAS_VOLTAGE_DISABLED) 245 return -EINVAL; 246 247 if (!(st->chip_info->flags & AD7793_HAS_EXITATION_CURRENT) && 248 pdata->exitation_current != AD7793_IX_DISABLED) 249 return -EINVAL; 250 251 return 0; 252 } 253 254 static int ad7793_setup(struct iio_dev *indio_dev, 255 const struct ad7793_platform_data *pdata, 256 unsigned int vref_mv) 257 { 258 struct ad7793_state *st = iio_priv(indio_dev); 259 int i, ret; 260 unsigned long long scale_uv; 261 u32 id; 262 263 ret = ad7793_check_platform_data(st, pdata); 264 if (ret) 265 return ret; 266 267 /* reset the serial interface */ 268 ret = ad_sd_reset(&st->sd); 269 if (ret < 0) 270 goto out; 271 usleep_range(500, 2000); /* Wait for at least 500us */ 272 273 /* write/read test for device presence */ 274 ret = ad_sd_read_reg(&st->sd, AD7793_REG_ID, 1, &id); 275 if (ret) 276 goto out; 277 278 id &= AD7793_ID_MASK; 279 280 if (id != st->chip_info->id) { 281 ret = -ENODEV; 282 dev_err(&st->sd.spi->dev, "device ID query failed\n"); 283 goto out; 284 } 285 286 st->mode = AD7793_MODE_RATE(1); 287 st->conf = 0; 288 289 if (st->chip_info->flags & AD7793_FLAG_HAS_CLKSEL) 290 st->mode |= AD7793_MODE_CLKSRC(pdata->clock_src); 291 if (st->chip_info->flags & AD7793_FLAG_HAS_REFSEL) 292 st->conf |= AD7793_CONF_REFSEL(pdata->refsel); 293 if (st->chip_info->flags & AD7793_FLAG_HAS_VBIAS) 294 st->conf |= AD7793_CONF_VBIAS(pdata->bias_voltage); 295 if (pdata->buffered || !(st->chip_info->flags & AD7793_FLAG_HAS_BUFFER)) 296 st->conf |= AD7793_CONF_BUF; 297 if (pdata->boost_enable && 298 (st->chip_info->flags & AD7793_FLAG_HAS_VBIAS)) 299 st->conf |= AD7793_CONF_BOOST; 300 if (pdata->burnout_current) 301 st->conf |= AD7793_CONF_BO_EN; 302 if (pdata->unipolar) 303 st->conf |= AD7793_CONF_UNIPOLAR; 304 305 if (!(st->chip_info->flags & AD7793_FLAG_HAS_GAIN)) 306 st->conf |= AD7793_CONF_GAIN(7); 307 308 ret = ad7793_set_mode(&st->sd, AD_SD_MODE_IDLE); 309 if (ret) 310 goto out; 311 312 ret = ad7793_set_channel(&st->sd, 0); 313 if (ret) 314 goto out; 315 316 if (st->chip_info->flags & AD7793_HAS_EXITATION_CURRENT) { 317 ret = ad_sd_write_reg(&st->sd, AD7793_REG_IO, 1, 318 pdata->exitation_current | 319 (pdata->current_source_direction << 2)); 320 if (ret) 321 goto out; 322 } 323 324 ret = ad7793_calibrate_all(st); 325 if (ret) 326 goto out; 327 328 /* Populate available ADC input ranges */ 329 for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) { 330 scale_uv = ((u64)vref_mv * 100000000) 331 >> (st->chip_info->channels[0].scan_type.realbits - 332 (!!(st->conf & AD7793_CONF_UNIPOLAR) ? 0 : 1)); 333 scale_uv >>= i; 334 335 st->scale_avail[i][1] = do_div(scale_uv, 100000000) * 10; 336 st->scale_avail[i][0] = scale_uv; 337 } 338 339 return 0; 340 out: 341 dev_err(&st->sd.spi->dev, "setup failed\n"); 342 return ret; 343 } 344 345 static const u16 ad7793_sample_freq_avail[16] = {0, 470, 242, 123, 62, 50, 39, 346 33, 19, 17, 16, 12, 10, 8, 6, 4}; 347 348 static const u16 ad7797_sample_freq_avail[16] = {0, 0, 0, 123, 62, 50, 0, 349 33, 0, 17, 16, 12, 10, 8, 6, 4}; 350 351 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL( 352 "470 242 123 62 50 39 33 19 17 16 12 10 8 6 4"); 353 354 static IIO_CONST_ATTR_NAMED(sampling_frequency_available_ad7797, 355 sampling_frequency_available, "123 62 50 33 17 16 12 10 8 6 4"); 356 357 static int ad7793_read_avail(struct iio_dev *indio_dev, 358 struct iio_chan_spec const *chan, 359 const int **vals, int *type, int *length, 360 long mask) 361 { 362 struct ad7793_state *st = iio_priv(indio_dev); 363 364 switch (mask) { 365 case IIO_CHAN_INFO_SCALE: 366 *vals = (int *)st->scale_avail; 367 *type = IIO_VAL_INT_PLUS_NANO; 368 /* Values are stored in a 2D matrix */ 369 *length = ARRAY_SIZE(st->scale_avail) * 2; 370 371 return IIO_AVAIL_LIST; 372 default: 373 return -EINVAL; 374 } 375 } 376 377 static struct attribute *ad7793_attributes[] = { 378 &iio_const_attr_sampling_frequency_available.dev_attr.attr, 379 NULL 380 }; 381 382 static const struct attribute_group ad7793_attribute_group = { 383 .attrs = ad7793_attributes, 384 }; 385 386 static struct attribute *ad7797_attributes[] = { 387 &iio_const_attr_sampling_frequency_available_ad7797.dev_attr.attr, 388 NULL 389 }; 390 391 static const struct attribute_group ad7797_attribute_group = { 392 .attrs = ad7797_attributes, 393 }; 394 395 static int ad7793_read_raw(struct iio_dev *indio_dev, 396 struct iio_chan_spec const *chan, 397 int *val, 398 int *val2, 399 long m) 400 { 401 struct ad7793_state *st = iio_priv(indio_dev); 402 int ret; 403 unsigned long long scale_uv; 404 bool unipolar = !!(st->conf & AD7793_CONF_UNIPOLAR); 405 406 switch (m) { 407 case IIO_CHAN_INFO_RAW: 408 ret = ad_sigma_delta_single_conversion(indio_dev, chan, val); 409 if (ret < 0) 410 return ret; 411 412 return IIO_VAL_INT; 413 414 case IIO_CHAN_INFO_SCALE: 415 switch (chan->type) { 416 case IIO_VOLTAGE: 417 if (chan->differential) { 418 *val = st-> 419 scale_avail[(st->conf >> 8) & 0x7][0]; 420 *val2 = st-> 421 scale_avail[(st->conf >> 8) & 0x7][1]; 422 return IIO_VAL_INT_PLUS_NANO; 423 } 424 /* 1170mV / 2^23 * 6 */ 425 scale_uv = (1170ULL * 1000000000ULL * 6ULL); 426 break; 427 case IIO_TEMP: 428 /* 1170mV / 0.81 mV/C / 2^23 */ 429 scale_uv = 1444444444444444ULL; 430 break; 431 default: 432 return -EINVAL; 433 } 434 435 scale_uv >>= (chan->scan_type.realbits - (unipolar ? 0 : 1)); 436 *val = 0; 437 *val2 = scale_uv; 438 return IIO_VAL_INT_PLUS_NANO; 439 case IIO_CHAN_INFO_OFFSET: 440 if (!unipolar) 441 *val = -(1 << (chan->scan_type.realbits - 1)); 442 else 443 *val = 0; 444 445 /* Kelvin to Celsius */ 446 if (chan->type == IIO_TEMP) { 447 unsigned long long offset; 448 unsigned int shift; 449 450 shift = chan->scan_type.realbits - (unipolar ? 0 : 1); 451 offset = 273ULL << shift; 452 do_div(offset, 1444); 453 *val -= offset; 454 } 455 return IIO_VAL_INT; 456 case IIO_CHAN_INFO_SAMP_FREQ: 457 *val = st->chip_info 458 ->sample_freq_avail[AD7793_MODE_RATE(st->mode)]; 459 return IIO_VAL_INT; 460 } 461 return -EINVAL; 462 } 463 464 static int __ad7793_write_raw(struct iio_dev *indio_dev, 465 struct iio_chan_spec const *chan, 466 int val, int val2, long mask) 467 { 468 struct ad7793_state *st = iio_priv(indio_dev); 469 int i; 470 unsigned int tmp; 471 472 switch (mask) { 473 case IIO_CHAN_INFO_SCALE: 474 for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) { 475 if (val2 != st->scale_avail[i][1]) 476 continue; 477 478 tmp = st->conf; 479 st->conf &= ~AD7793_CONF_GAIN(-1); 480 st->conf |= AD7793_CONF_GAIN(i); 481 482 if (tmp == st->conf) 483 return 0; 484 485 ad_sd_write_reg(&st->sd, AD7793_REG_CONF, 486 sizeof(st->conf), st->conf); 487 ad7793_calibrate_all(st); 488 489 return 0; 490 } 491 return -EINVAL; 492 case IIO_CHAN_INFO_SAMP_FREQ: 493 if (!val) 494 return -EINVAL; 495 496 for (i = 0; i < 16; i++) 497 if (val == st->chip_info->sample_freq_avail[i]) 498 break; 499 500 if (i == 16) 501 return -EINVAL; 502 503 st->mode &= ~AD7793_MODE_RATE(-1); 504 st->mode |= AD7793_MODE_RATE(i); 505 ad_sd_write_reg(&st->sd, AD7793_REG_MODE, sizeof(st->mode), 506 st->mode); 507 return 0; 508 default: 509 return -EINVAL; 510 } 511 } 512 513 static int ad7793_write_raw(struct iio_dev *indio_dev, 514 struct iio_chan_spec const *chan, 515 int val, int val2, long mask) 516 { 517 int ret; 518 519 if (!iio_device_claim_direct(indio_dev)) 520 return -EBUSY; 521 522 ret = __ad7793_write_raw(indio_dev, chan, val, val2, mask); 523 524 iio_device_release_direct(indio_dev); 525 526 return ret; 527 } 528 529 static int ad7793_write_raw_get_fmt(struct iio_dev *indio_dev, 530 struct iio_chan_spec const *chan, 531 long mask) 532 { 533 return IIO_VAL_INT_PLUS_NANO; 534 } 535 536 static const struct iio_info ad7793_info = { 537 .read_raw = &ad7793_read_raw, 538 .write_raw = &ad7793_write_raw, 539 .write_raw_get_fmt = &ad7793_write_raw_get_fmt, 540 .read_avail = ad7793_read_avail, 541 .attrs = &ad7793_attribute_group, 542 .validate_trigger = ad_sd_validate_trigger, 543 }; 544 545 static const struct iio_info ad7797_info = { 546 .read_raw = &ad7793_read_raw, 547 .write_raw = &ad7793_write_raw, 548 .write_raw_get_fmt = &ad7793_write_raw_get_fmt, 549 .attrs = &ad7797_attribute_group, 550 .validate_trigger = ad_sd_validate_trigger, 551 }; 552 553 #define __AD7793_CHANNEL(_si, _channel1, _channel2, _address, _bits, \ 554 _storagebits, _shift, _extend_name, _type, _mask_type_av, _mask_all) \ 555 { \ 556 .type = (_type), \ 557 .differential = (_channel2 == -1 ? 0 : 1), \ 558 .indexed = 1, \ 559 .channel = (_channel1), \ 560 .channel2 = (_channel2), \ 561 .address = (_address), \ 562 .extend_name = (_extend_name), \ 563 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ 564 BIT(IIO_CHAN_INFO_OFFSET), \ 565 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ 566 .info_mask_shared_by_type_available = (_mask_type_av), \ 567 .info_mask_shared_by_all = _mask_all, \ 568 .scan_index = (_si), \ 569 .scan_type = { \ 570 .sign = 'u', \ 571 .realbits = (_bits), \ 572 .storagebits = (_storagebits), \ 573 .shift = (_shift), \ 574 .endianness = IIO_BE, \ 575 }, \ 576 } 577 578 #define AD7793_DIFF_CHANNEL(_si, _channel1, _channel2, _address, _bits, \ 579 _storagebits, _shift) \ 580 __AD7793_CHANNEL(_si, _channel1, _channel2, _address, _bits, \ 581 _storagebits, _shift, NULL, IIO_VOLTAGE, \ 582 BIT(IIO_CHAN_INFO_SCALE), \ 583 BIT(IIO_CHAN_INFO_SAMP_FREQ)) 584 585 #define AD7793_SHORTED_CHANNEL(_si, _channel, _address, _bits, \ 586 _storagebits, _shift) \ 587 __AD7793_CHANNEL(_si, _channel, _channel, _address, _bits, \ 588 _storagebits, _shift, "shorted", IIO_VOLTAGE, \ 589 BIT(IIO_CHAN_INFO_SCALE), \ 590 BIT(IIO_CHAN_INFO_SAMP_FREQ)) 591 592 #define AD7793_TEMP_CHANNEL(_si, _address, _bits, _storagebits, _shift) \ 593 __AD7793_CHANNEL(_si, 0, -1, _address, _bits, \ 594 _storagebits, _shift, NULL, IIO_TEMP, \ 595 0, \ 596 BIT(IIO_CHAN_INFO_SAMP_FREQ)) 597 598 #define AD7793_SUPPLY_CHANNEL(_si, _channel, _address, _bits, _storagebits, \ 599 _shift) \ 600 __AD7793_CHANNEL(_si, _channel, -1, _address, _bits, \ 601 _storagebits, _shift, "supply", IIO_VOLTAGE, \ 602 0, \ 603 BIT(IIO_CHAN_INFO_SAMP_FREQ)) 604 605 #define AD7797_DIFF_CHANNEL(_si, _channel1, _channel2, _address, _bits, \ 606 _storagebits, _shift) \ 607 __AD7793_CHANNEL(_si, _channel1, _channel2, _address, _bits, \ 608 _storagebits, _shift, NULL, IIO_VOLTAGE, \ 609 0, \ 610 BIT(IIO_CHAN_INFO_SAMP_FREQ)) 611 612 #define AD7797_SHORTED_CHANNEL(_si, _channel, _address, _bits, \ 613 _storagebits, _shift) \ 614 __AD7793_CHANNEL(_si, _channel, _channel, _address, _bits, \ 615 _storagebits, _shift, "shorted", IIO_VOLTAGE, \ 616 0, \ 617 BIT(IIO_CHAN_INFO_SAMP_FREQ)) 618 619 #define DECLARE_AD7793_CHANNELS(_name, _b, _sb, _s) \ 620 const struct iio_chan_spec _name##_channels[] = { \ 621 AD7793_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), (_s)), \ 622 AD7793_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), (_s)), \ 623 AD7793_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), (_s)), \ 624 AD7793_SHORTED_CHANNEL(3, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), (_s)), \ 625 AD7793_TEMP_CHANNEL(4, AD7793_CH_TEMP, (_b), (_sb), (_s)), \ 626 AD7793_SUPPLY_CHANNEL(5, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), (_s)), \ 627 IIO_CHAN_SOFT_TIMESTAMP(6), \ 628 } 629 630 #define DECLARE_AD7795_CHANNELS(_name, _b, _sb) \ 631 const struct iio_chan_spec _name##_channels[] = { \ 632 AD7793_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \ 633 AD7793_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), 0), \ 634 AD7793_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), 0), \ 635 AD7793_DIFF_CHANNEL(3, 3, 3, AD7795_CH_AIN4P_AIN4M, (_b), (_sb), 0), \ 636 AD7793_DIFF_CHANNEL(4, 4, 4, AD7795_CH_AIN5P_AIN5M, (_b), (_sb), 0), \ 637 AD7793_DIFF_CHANNEL(5, 5, 5, AD7795_CH_AIN6P_AIN6M, (_b), (_sb), 0), \ 638 AD7793_SHORTED_CHANNEL(6, 0, AD7795_CH_AIN1M_AIN1M, (_b), (_sb), 0), \ 639 AD7793_TEMP_CHANNEL(7, AD7793_CH_TEMP, (_b), (_sb), 0), \ 640 AD7793_SUPPLY_CHANNEL(8, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \ 641 IIO_CHAN_SOFT_TIMESTAMP(9), \ 642 } 643 644 #define DECLARE_AD7797_CHANNELS(_name, _b, _sb) \ 645 const struct iio_chan_spec _name##_channels[] = { \ 646 AD7797_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \ 647 AD7797_SHORTED_CHANNEL(1, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), 0), \ 648 AD7793_TEMP_CHANNEL(2, AD7793_CH_TEMP, (_b), (_sb), 0), \ 649 AD7793_SUPPLY_CHANNEL(3, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \ 650 IIO_CHAN_SOFT_TIMESTAMP(4), \ 651 } 652 653 #define DECLARE_AD7799_CHANNELS(_name, _b, _sb) \ 654 const struct iio_chan_spec _name##_channels[] = { \ 655 AD7793_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \ 656 AD7793_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), 0), \ 657 AD7793_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), 0), \ 658 AD7793_SHORTED_CHANNEL(3, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), 0), \ 659 AD7793_SUPPLY_CHANNEL(4, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \ 660 IIO_CHAN_SOFT_TIMESTAMP(5), \ 661 } 662 663 static DECLARE_AD7793_CHANNELS(ad7785, 20, 32, 4); 664 static DECLARE_AD7793_CHANNELS(ad7792, 16, 32, 0); 665 static DECLARE_AD7793_CHANNELS(ad7793, 24, 32, 0); 666 static DECLARE_AD7795_CHANNELS(ad7794, 16, 32); 667 static DECLARE_AD7795_CHANNELS(ad7795, 24, 32); 668 static DECLARE_AD7797_CHANNELS(ad7796, 16, 16); 669 static DECLARE_AD7797_CHANNELS(ad7797, 24, 32); 670 static DECLARE_AD7799_CHANNELS(ad7798, 16, 16); 671 static DECLARE_AD7799_CHANNELS(ad7799, 24, 32); 672 673 static const struct ad7793_chip_info ad7793_chip_info_tbl[] = { 674 [ID_AD7785] = { 675 .id = AD7785_ID, 676 .channels = ad7785_channels, 677 .num_channels = ARRAY_SIZE(ad7785_channels), 678 .iio_info = &ad7793_info, 679 .sample_freq_avail = ad7793_sample_freq_avail, 680 .flags = AD7793_FLAG_HAS_CLKSEL | 681 AD7793_FLAG_HAS_REFSEL | 682 AD7793_FLAG_HAS_VBIAS | 683 AD7793_HAS_EXITATION_CURRENT | 684 AD7793_FLAG_HAS_GAIN | 685 AD7793_FLAG_HAS_BUFFER, 686 }, 687 [ID_AD7792] = { 688 .id = AD7792_ID, 689 .channels = ad7792_channels, 690 .num_channels = ARRAY_SIZE(ad7792_channels), 691 .iio_info = &ad7793_info, 692 .sample_freq_avail = ad7793_sample_freq_avail, 693 .flags = AD7793_FLAG_HAS_CLKSEL | 694 AD7793_FLAG_HAS_REFSEL | 695 AD7793_FLAG_HAS_VBIAS | 696 AD7793_HAS_EXITATION_CURRENT | 697 AD7793_FLAG_HAS_GAIN | 698 AD7793_FLAG_HAS_BUFFER, 699 }, 700 [ID_AD7793] = { 701 .id = AD7793_ID, 702 .channels = ad7793_channels, 703 .num_channels = ARRAY_SIZE(ad7793_channels), 704 .iio_info = &ad7793_info, 705 .sample_freq_avail = ad7793_sample_freq_avail, 706 .flags = AD7793_FLAG_HAS_CLKSEL | 707 AD7793_FLAG_HAS_REFSEL | 708 AD7793_FLAG_HAS_VBIAS | 709 AD7793_HAS_EXITATION_CURRENT | 710 AD7793_FLAG_HAS_GAIN | 711 AD7793_FLAG_HAS_BUFFER, 712 }, 713 [ID_AD7794] = { 714 .id = AD7794_ID, 715 .channels = ad7794_channels, 716 .num_channels = ARRAY_SIZE(ad7794_channels), 717 .iio_info = &ad7793_info, 718 .sample_freq_avail = ad7793_sample_freq_avail, 719 .flags = AD7793_FLAG_HAS_CLKSEL | 720 AD7793_FLAG_HAS_REFSEL | 721 AD7793_FLAG_HAS_VBIAS | 722 AD7793_HAS_EXITATION_CURRENT | 723 AD7793_FLAG_HAS_GAIN | 724 AD7793_FLAG_HAS_BUFFER, 725 }, 726 [ID_AD7795] = { 727 .id = AD7795_ID, 728 .channels = ad7795_channels, 729 .num_channels = ARRAY_SIZE(ad7795_channels), 730 .iio_info = &ad7793_info, 731 .sample_freq_avail = ad7793_sample_freq_avail, 732 .flags = AD7793_FLAG_HAS_CLKSEL | 733 AD7793_FLAG_HAS_REFSEL | 734 AD7793_FLAG_HAS_VBIAS | 735 AD7793_HAS_EXITATION_CURRENT | 736 AD7793_FLAG_HAS_GAIN | 737 AD7793_FLAG_HAS_BUFFER, 738 }, 739 [ID_AD7796] = { 740 .id = AD7796_ID, 741 .channels = ad7796_channels, 742 .num_channels = ARRAY_SIZE(ad7796_channels), 743 .iio_info = &ad7797_info, 744 .sample_freq_avail = ad7797_sample_freq_avail, 745 .flags = AD7793_FLAG_HAS_CLKSEL, 746 }, 747 [ID_AD7797] = { 748 .id = AD7797_ID, 749 .channels = ad7797_channels, 750 .num_channels = ARRAY_SIZE(ad7797_channels), 751 .iio_info = &ad7797_info, 752 .sample_freq_avail = ad7797_sample_freq_avail, 753 .flags = AD7793_FLAG_HAS_CLKSEL, 754 }, 755 [ID_AD7798] = { 756 .id = AD7798_ID, 757 .channels = ad7798_channels, 758 .num_channels = ARRAY_SIZE(ad7798_channels), 759 .iio_info = &ad7793_info, 760 .sample_freq_avail = ad7793_sample_freq_avail, 761 .flags = AD7793_FLAG_HAS_GAIN | 762 AD7793_FLAG_HAS_BUFFER, 763 }, 764 [ID_AD7799] = { 765 .id = AD7799_ID, 766 .channels = ad7799_channels, 767 .num_channels = ARRAY_SIZE(ad7799_channels), 768 .iio_info = &ad7793_info, 769 .sample_freq_avail = ad7793_sample_freq_avail, 770 .flags = AD7793_FLAG_HAS_GAIN | 771 AD7793_FLAG_HAS_BUFFER, 772 }, 773 }; 774 775 static int ad7793_probe(struct spi_device *spi) 776 { 777 const struct ad7793_platform_data *pdata = dev_get_platdata(&spi->dev); 778 struct ad7793_state *st; 779 struct iio_dev *indio_dev; 780 int ret, vref_mv = 0; 781 782 if (!pdata) { 783 dev_err(&spi->dev, "no platform data?\n"); 784 return -ENODEV; 785 } 786 787 if (!spi->irq) { 788 dev_err(&spi->dev, "no IRQ?\n"); 789 return -ENODEV; 790 } 791 792 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); 793 if (indio_dev == NULL) 794 return -ENOMEM; 795 796 st = iio_priv(indio_dev); 797 798 ad_sd_init(&st->sd, indio_dev, spi, &ad7793_sigma_delta_info); 799 800 if (pdata->refsel != AD7793_REFSEL_INTERNAL) { 801 ret = devm_regulator_get_enable_read_voltage(&spi->dev, "refin"); 802 if (ret < 0) 803 return ret; 804 805 vref_mv = ret / 1000; 806 } else { 807 vref_mv = 1170; /* Built-in ref */ 808 } 809 810 st->chip_info = 811 &ad7793_chip_info_tbl[spi_get_device_id(spi)->driver_data]; 812 813 indio_dev->name = spi_get_device_id(spi)->name; 814 indio_dev->modes = INDIO_DIRECT_MODE; 815 indio_dev->channels = st->chip_info->channels; 816 indio_dev->num_channels = st->chip_info->num_channels; 817 indio_dev->info = st->chip_info->iio_info; 818 819 ret = devm_ad_sd_setup_buffer_and_trigger(&spi->dev, indio_dev); 820 if (ret) 821 return ret; 822 823 ret = ad7793_setup(indio_dev, pdata, vref_mv); 824 if (ret) 825 return ret; 826 827 return devm_iio_device_register(&spi->dev, indio_dev); 828 } 829 830 static const struct spi_device_id ad7793_id[] = { 831 { "ad7785", ID_AD7785 }, 832 { "ad7792", ID_AD7792 }, 833 { "ad7793", ID_AD7793 }, 834 { "ad7794", ID_AD7794 }, 835 { "ad7795", ID_AD7795 }, 836 { "ad7796", ID_AD7796 }, 837 { "ad7797", ID_AD7797 }, 838 { "ad7798", ID_AD7798 }, 839 { "ad7799", ID_AD7799 }, 840 { } 841 }; 842 MODULE_DEVICE_TABLE(spi, ad7793_id); 843 844 static struct spi_driver ad7793_driver = { 845 .driver = { 846 .name = "ad7793", 847 }, 848 .probe = ad7793_probe, 849 .id_table = ad7793_id, 850 }; 851 module_spi_driver(ad7793_driver); 852 853 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); 854 MODULE_DESCRIPTION("Analog Devices AD7793 and similar ADCs"); 855 MODULE_LICENSE("GPL v2"); 856 MODULE_IMPORT_NS("IIO_AD_SIGMA_DELTA"); 857