1// SPDX-License-Identifier: GPL-2.0 2/* 3 * AD7190 AD7192 AD7193 AD7195 SPI ADC driver 4 * 5 * Copyright 2011-2015 Analog Devices Inc. 6 */ 7 8#include <linux/interrupt.h> 9#include <linux/bitfield.h> 10#include <linux/clk.h> 11#include <linux/device.h> 12#include <linux/kernel.h> 13#include <linux/slab.h> 14#include <linux/sysfs.h> 15#include <linux/spi/spi.h> 16#include <linux/regulator/consumer.h> 17#include <linux/err.h> 18#include <linux/sched.h> 19#include <linux/delay.h> 20#include <linux/of.h> 21 22#include <linux/iio/iio.h> 23#include <linux/iio/sysfs.h> 24#include <linux/iio/buffer.h> 25#include <linux/iio/trigger.h> 26#include <linux/iio/trigger_consumer.h> 27#include <linux/iio/triggered_buffer.h> 28#include <linux/iio/adc/ad_sigma_delta.h> 29 30/* Registers */ 31#define AD7192_REG_COMM 0 /* Communications Register (WO, 8-bit) */ 32#define AD7192_REG_STAT 0 /* Status Register (RO, 8-bit) */ 33#define AD7192_REG_MODE 1 /* Mode Register (RW, 24-bit */ 34#define AD7192_REG_CONF 2 /* Configuration Register (RW, 24-bit) */ 35#define AD7192_REG_DATA 3 /* Data Register (RO, 24/32-bit) */ 36#define AD7192_REG_ID 4 /* ID Register (RO, 8-bit) */ 37#define AD7192_REG_GPOCON 5 /* GPOCON Register (RO, 8-bit) */ 38#define AD7192_REG_OFFSET 6 /* Offset Register (RW, 16-bit */ 39 /* (AD7792)/24-bit (AD7192)) */ 40#define AD7192_REG_FULLSALE 7 /* Full-Scale Register */ 41 /* (RW, 16-bit (AD7792)/24-bit (AD7192)) */ 42 43/* Communications Register Bit Designations (AD7192_REG_COMM) */ 44#define AD7192_COMM_WEN BIT(7) /* Write Enable */ 45#define AD7192_COMM_WRITE 0 /* Write Operation */ 46#define AD7192_COMM_READ BIT(6) /* Read Operation */ 47#define AD7192_COMM_ADDR_MASK GENMASK(5, 3) /* Register Address Mask */ 48#define AD7192_COMM_CREAD BIT(2) /* Continuous Read of Data Register */ 49 50/* Status Register Bit Designations (AD7192_REG_STAT) */ 51#define AD7192_STAT_RDY BIT(7) /* Ready */ 52#define AD7192_STAT_ERR BIT(6) /* Error (Overrange, Underrange) */ 53#define AD7192_STAT_NOREF BIT(5) /* Error no external reference */ 54#define AD7192_STAT_PARITY BIT(4) /* Parity */ 55#define AD7192_STAT_CH3 BIT(2) /* Channel 3 */ 56#define AD7192_STAT_CH2 BIT(1) /* Channel 2 */ 57#define AD7192_STAT_CH1 BIT(0) /* Channel 1 */ 58 59/* Mode Register Bit Designations (AD7192_REG_MODE) */ 60#define AD7192_MODE_SEL_MASK GENMASK(23, 21) /* Operation Mode Select Mask */ 61#define AD7192_MODE_STA_MASK BIT(20) /* Status Register transmission Mask */ 62#define AD7192_MODE_CLKSRC_MASK GENMASK(19, 18) /* Clock Source Select Mask */ 63#define AD7192_MODE_AVG_MASK GENMASK(17, 16) 64 /* Fast Settling Filter Average Select Mask (AD7193 only) */ 65#define AD7192_MODE_SINC3 BIT(15) /* SINC3 Filter Select */ 66#define AD7192_MODE_ENPAR BIT(13) /* Parity Enable */ 67#define AD7192_MODE_CLKDIV BIT(12) /* Clock divide by 2 (AD7190/2 only)*/ 68#define AD7192_MODE_SCYCLE BIT(11) /* Single cycle conversion */ 69#define AD7192_MODE_REJ60 BIT(10) /* 50/60Hz notch filter */ 70 /* Filter Update Rate Select Mask */ 71#define AD7192_MODE_RATE_MASK GENMASK(9, 0) 72 73/* Mode Register: AD7192_MODE_SEL options */ 74#define AD7192_MODE_CONT 0 /* Continuous Conversion Mode */ 75#define AD7192_MODE_SINGLE 1 /* Single Conversion Mode */ 76#define AD7192_MODE_IDLE 2 /* Idle Mode */ 77#define AD7192_MODE_PWRDN 3 /* Power-Down Mode */ 78#define AD7192_MODE_CAL_INT_ZERO 4 /* Internal Zero-Scale Calibration */ 79#define AD7192_MODE_CAL_INT_FULL 5 /* Internal Full-Scale Calibration */ 80#define AD7192_MODE_CAL_SYS_ZERO 6 /* System Zero-Scale Calibration */ 81#define AD7192_MODE_CAL_SYS_FULL 7 /* System Full-Scale Calibration */ 82 83/* Mode Register: AD7192_MODE_CLKSRC options */ 84#define AD7192_CLK_EXT_MCLK1_2 0 /* External 4.92 MHz Clock connected*/ 85 /* from MCLK1 to MCLK2 */ 86#define AD7192_CLK_EXT_MCLK2 1 /* External Clock applied to MCLK2 */ 87#define AD7192_CLK_INT 2 /* Internal 4.92 MHz Clock not */ 88 /* available at the MCLK2 pin */ 89#define AD7192_CLK_INT_CO 3 /* Internal 4.92 MHz Clock available*/ 90 /* at the MCLK2 pin */ 91 92/* Configuration Register Bit Designations (AD7192_REG_CONF) */ 93 94#define AD7192_CONF_CHOP BIT(23) /* CHOP enable */ 95#define AD7192_CONF_ACX BIT(22) /* AC excitation enable(AD7195 only) */ 96#define AD7192_CONF_REFSEL BIT(20) /* REFIN1/REFIN2 Reference Select */ 97#define AD7192_CONF_CHAN_MASK GENMASK(18, 8) /* Channel select mask */ 98#define AD7192_CONF_BURN BIT(7) /* Burnout current enable */ 99#define AD7192_CONF_REFDET BIT(6) /* Reference detect enable */ 100#define AD7192_CONF_BUF BIT(4) /* Buffered Mode Enable */ 101#define AD7192_CONF_UNIPOLAR BIT(3) /* Unipolar/Bipolar Enable */ 102#define AD7192_CONF_GAIN_MASK GENMASK(2, 0) /* Gain Select */ 103 104#define AD7192_CH_AIN1P_AIN2M BIT(0) /* AIN1(+) - AIN2(-) */ 105#define AD7192_CH_AIN3P_AIN4M BIT(1) /* AIN3(+) - AIN4(-) */ 106#define AD7192_CH_TEMP BIT(2) /* Temp Sensor */ 107#define AD7192_CH_AIN2P_AIN2M BIT(3) /* AIN2(+) - AIN2(-) */ 108#define AD7192_CH_AIN1 BIT(4) /* AIN1 - AINCOM */ 109#define AD7192_CH_AIN2 BIT(5) /* AIN2 - AINCOM */ 110#define AD7192_CH_AIN3 BIT(6) /* AIN3 - AINCOM */ 111#define AD7192_CH_AIN4 BIT(7) /* AIN4 - AINCOM */ 112 113#define AD7193_CH_AIN1P_AIN2M 0x001 /* AIN1(+) - AIN2(-) */ 114#define AD7193_CH_AIN3P_AIN4M 0x002 /* AIN3(+) - AIN4(-) */ 115#define AD7193_CH_AIN5P_AIN6M 0x004 /* AIN5(+) - AIN6(-) */ 116#define AD7193_CH_AIN7P_AIN8M 0x008 /* AIN7(+) - AIN8(-) */ 117#define AD7193_CH_TEMP 0x100 /* Temp senseor */ 118#define AD7193_CH_AIN2P_AIN2M 0x200 /* AIN2(+) - AIN2(-) */ 119#define AD7193_CH_AIN1 0x401 /* AIN1 - AINCOM */ 120#define AD7193_CH_AIN2 0x402 /* AIN2 - AINCOM */ 121#define AD7193_CH_AIN3 0x404 /* AIN3 - AINCOM */ 122#define AD7193_CH_AIN4 0x408 /* AIN4 - AINCOM */ 123#define AD7193_CH_AIN5 0x410 /* AIN5 - AINCOM */ 124#define AD7193_CH_AIN6 0x420 /* AIN6 - AINCOM */ 125#define AD7193_CH_AIN7 0x440 /* AIN7 - AINCOM */ 126#define AD7193_CH_AIN8 0x480 /* AIN7 - AINCOM */ 127#define AD7193_CH_AINCOM 0x600 /* AINCOM - AINCOM */ 128 129/* ID Register Bit Designations (AD7192_REG_ID) */ 130#define CHIPID_AD7190 0x4 131#define CHIPID_AD7192 0x0 132#define CHIPID_AD7193 0x2 133#define CHIPID_AD7195 0x6 134#define AD7192_ID_MASK GENMASK(3, 0) 135 136/* GPOCON Register Bit Designations (AD7192_REG_GPOCON) */ 137#define AD7192_GPOCON_BPDSW BIT(6) /* Bridge power-down switch enable */ 138#define AD7192_GPOCON_GP32EN BIT(5) /* Digital Output P3 and P2 enable */ 139#define AD7192_GPOCON_GP10EN BIT(4) /* Digital Output P1 and P0 enable */ 140#define AD7192_GPOCON_P3DAT BIT(3) /* P3 state */ 141#define AD7192_GPOCON_P2DAT BIT(2) /* P2 state */ 142#define AD7192_GPOCON_P1DAT BIT(1) /* P1 state */ 143#define AD7192_GPOCON_P0DAT BIT(0) /* P0 state */ 144 145#define AD7192_EXT_FREQ_MHZ_MIN 2457600 146#define AD7192_EXT_FREQ_MHZ_MAX 5120000 147#define AD7192_INT_FREQ_MHZ 4915200 148 149#define AD7192_NO_SYNC_FILTER 1 150#define AD7192_SYNC3_FILTER 3 151#define AD7192_SYNC4_FILTER 4 152 153/* NOTE: 154 * The AD7190/2/5 features a dual use data out ready DOUT/RDY output. 155 * In order to avoid contentions on the SPI bus, it's therefore necessary 156 * to use spi bus locking. 157 * 158 * The DOUT/RDY output must also be wired to an interrupt capable GPIO. 159 */ 160 161enum { 162 AD7192_SYSCALIB_ZERO_SCALE, 163 AD7192_SYSCALIB_FULL_SCALE, 164}; 165 166enum { 167 ID_AD7190, 168 ID_AD7192, 169 ID_AD7193, 170 ID_AD7195, 171}; 172 173struct ad7192_chip_info { 174 unsigned int chip_id; 175 const char *name; 176 const struct iio_chan_spec *channels; 177 u8 num_channels; 178 const struct iio_info *info; 179}; 180 181struct ad7192_state { 182 const struct ad7192_chip_info *chip_info; 183 struct regulator *avdd; 184 struct regulator *vref; 185 struct clk *mclk; 186 u16 int_vref_mv; 187 u32 fclk; 188 u32 mode; 189 u32 conf; 190 u32 scale_avail[8][2]; 191 u32 oversampling_ratio_avail[4]; 192 u8 gpocon; 193 u8 clock_sel; 194 struct mutex lock; /* protect sensor state */ 195 u8 syscalib_mode[8]; 196 197 struct ad_sigma_delta sd; 198}; 199 200static const char * const ad7192_syscalib_modes[] = { 201 [AD7192_SYSCALIB_ZERO_SCALE] = "zero_scale", 202 [AD7192_SYSCALIB_FULL_SCALE] = "full_scale", 203}; 204 205static int ad7192_set_syscalib_mode(struct iio_dev *indio_dev, 206 const struct iio_chan_spec *chan, 207 unsigned int mode) 208{ 209 struct ad7192_state *st = iio_priv(indio_dev); 210 211 st->syscalib_mode[chan->channel] = mode; 212 213 return 0; 214} 215 216static int ad7192_get_syscalib_mode(struct iio_dev *indio_dev, 217 const struct iio_chan_spec *chan) 218{ 219 struct ad7192_state *st = iio_priv(indio_dev); 220 221 return st->syscalib_mode[chan->channel]; 222} 223 224static ssize_t ad7192_write_syscalib(struct iio_dev *indio_dev, 225 uintptr_t private, 226 const struct iio_chan_spec *chan, 227 const char *buf, size_t len) 228{ 229 struct ad7192_state *st = iio_priv(indio_dev); 230 bool sys_calib; 231 int ret, temp; 232 233 ret = kstrtobool(buf, &sys_calib); 234 if (ret) 235 return ret; 236 237 temp = st->syscalib_mode[chan->channel]; 238 if (sys_calib) { 239 if (temp == AD7192_SYSCALIB_ZERO_SCALE) 240 ret = ad_sd_calibrate(&st->sd, AD7192_MODE_CAL_SYS_ZERO, 241 chan->address); 242 else 243 ret = ad_sd_calibrate(&st->sd, AD7192_MODE_CAL_SYS_FULL, 244 chan->address); 245 } 246 247 return ret ? ret : len; 248} 249 250static const struct iio_enum ad7192_syscalib_mode_enum = { 251 .items = ad7192_syscalib_modes, 252 .num_items = ARRAY_SIZE(ad7192_syscalib_modes), 253 .set = ad7192_set_syscalib_mode, 254 .get = ad7192_get_syscalib_mode 255}; 256 257static const struct iio_chan_spec_ext_info ad7192_calibsys_ext_info[] = { 258 { 259 .name = "sys_calibration", 260 .write = ad7192_write_syscalib, 261 .shared = IIO_SEPARATE, 262 }, 263 IIO_ENUM("sys_calibration_mode", IIO_SEPARATE, 264 &ad7192_syscalib_mode_enum), 265 IIO_ENUM_AVAILABLE("sys_calibration_mode", IIO_SHARED_BY_TYPE, 266 &ad7192_syscalib_mode_enum), 267 {} 268}; 269 270static struct ad7192_state *ad_sigma_delta_to_ad7192(struct ad_sigma_delta *sd) 271{ 272 return container_of(sd, struct ad7192_state, sd); 273} 274 275static int ad7192_set_channel(struct ad_sigma_delta *sd, unsigned int channel) 276{ 277 struct ad7192_state *st = ad_sigma_delta_to_ad7192(sd); 278 279 st->conf &= ~AD7192_CONF_CHAN_MASK; 280 st->conf |= FIELD_PREP(AD7192_CONF_CHAN_MASK, channel); 281 282 return ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, st->conf); 283} 284 285static int ad7192_set_mode(struct ad_sigma_delta *sd, 286 enum ad_sigma_delta_mode mode) 287{ 288 struct ad7192_state *st = ad_sigma_delta_to_ad7192(sd); 289 290 st->mode &= ~AD7192_MODE_SEL_MASK; 291 st->mode |= FIELD_PREP(AD7192_MODE_SEL_MASK, mode); 292 293 return ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode); 294} 295 296static int ad7192_append_status(struct ad_sigma_delta *sd, bool append) 297{ 298 struct ad7192_state *st = ad_sigma_delta_to_ad7192(sd); 299 unsigned int mode = st->mode; 300 int ret; 301 302 mode &= ~AD7192_MODE_STA_MASK; 303 mode |= FIELD_PREP(AD7192_MODE_STA_MASK, append); 304 305 ret = ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, mode); 306 if (ret < 0) 307 return ret; 308 309 st->mode = mode; 310 311 return 0; 312} 313 314static int ad7192_disable_all(struct ad_sigma_delta *sd) 315{ 316 struct ad7192_state *st = ad_sigma_delta_to_ad7192(sd); 317 u32 conf = st->conf; 318 int ret; 319 320 conf &= ~AD7192_CONF_CHAN_MASK; 321 322 ret = ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, conf); 323 if (ret < 0) 324 return ret; 325 326 st->conf = conf; 327 328 return 0; 329} 330 331static const struct ad_sigma_delta_info ad7192_sigma_delta_info = { 332 .set_channel = ad7192_set_channel, 333 .append_status = ad7192_append_status, 334 .disable_all = ad7192_disable_all, 335 .set_mode = ad7192_set_mode, 336 .has_registers = true, 337 .addr_shift = 3, 338 .read_mask = BIT(6), 339 .status_ch_mask = GENMASK(3, 0), 340 .num_slots = 4, 341 .irq_flags = IRQF_TRIGGER_FALLING, 342}; 343 344static const struct ad_sd_calib_data ad7192_calib_arr[8] = { 345 {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN1}, 346 {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN1}, 347 {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN2}, 348 {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN2}, 349 {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN3}, 350 {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN3}, 351 {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN4}, 352 {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN4} 353}; 354 355static int ad7192_calibrate_all(struct ad7192_state *st) 356{ 357 return ad_sd_calibrate_all(&st->sd, ad7192_calib_arr, 358 ARRAY_SIZE(ad7192_calib_arr)); 359} 360 361static inline bool ad7192_valid_external_frequency(u32 freq) 362{ 363 return (freq >= AD7192_EXT_FREQ_MHZ_MIN && 364 freq <= AD7192_EXT_FREQ_MHZ_MAX); 365} 366 367static int ad7192_of_clock_select(struct ad7192_state *st) 368{ 369 struct device_node *np = st->sd.spi->dev.of_node; 370 unsigned int clock_sel; 371 372 clock_sel = AD7192_CLK_INT; 373 374 /* use internal clock */ 375 if (!st->mclk) { 376 if (of_property_read_bool(np, "adi,int-clock-output-enable")) 377 clock_sel = AD7192_CLK_INT_CO; 378 } else { 379 if (of_property_read_bool(np, "adi,clock-xtal")) 380 clock_sel = AD7192_CLK_EXT_MCLK1_2; 381 else 382 clock_sel = AD7192_CLK_EXT_MCLK2; 383 } 384 385 return clock_sel; 386} 387 388static int ad7192_setup(struct iio_dev *indio_dev, struct device_node *np) 389{ 390 struct ad7192_state *st = iio_priv(indio_dev); 391 bool rej60_en, refin2_en; 392 bool buf_en, bipolar, burnout_curr_en; 393 unsigned long long scale_uv; 394 int i, ret, id; 395 396 /* reset the serial interface */ 397 ret = ad_sd_reset(&st->sd, 48); 398 if (ret < 0) 399 return ret; 400 usleep_range(500, 1000); /* Wait for at least 500us */ 401 402 /* write/read test for device presence */ 403 ret = ad_sd_read_reg(&st->sd, AD7192_REG_ID, 1, &id); 404 if (ret) 405 return ret; 406 407 id = FIELD_GET(AD7192_ID_MASK, id); 408 409 if (id != st->chip_info->chip_id) 410 dev_warn(&st->sd.spi->dev, "device ID query failed (0x%X != 0x%X)\n", 411 id, st->chip_info->chip_id); 412 413 st->mode = FIELD_PREP(AD7192_MODE_SEL_MASK, AD7192_MODE_IDLE) | 414 FIELD_PREP(AD7192_MODE_CLKSRC_MASK, st->clock_sel) | 415 FIELD_PREP(AD7192_MODE_RATE_MASK, 480); 416 417 st->conf = FIELD_PREP(AD7192_CONF_GAIN_MASK, 0); 418 419 rej60_en = of_property_read_bool(np, "adi,rejection-60-Hz-enable"); 420 if (rej60_en) 421 st->mode |= AD7192_MODE_REJ60; 422 423 refin2_en = of_property_read_bool(np, "adi,refin2-pins-enable"); 424 if (refin2_en && st->chip_info->chip_id != CHIPID_AD7195) 425 st->conf |= AD7192_CONF_REFSEL; 426 427 st->conf &= ~AD7192_CONF_CHOP; 428 429 buf_en = of_property_read_bool(np, "adi,buffer-enable"); 430 if (buf_en) 431 st->conf |= AD7192_CONF_BUF; 432 433 bipolar = of_property_read_bool(np, "bipolar"); 434 if (!bipolar) 435 st->conf |= AD7192_CONF_UNIPOLAR; 436 437 burnout_curr_en = of_property_read_bool(np, 438 "adi,burnout-currents-enable"); 439 if (burnout_curr_en && buf_en) { 440 st->conf |= AD7192_CONF_BURN; 441 } else if (burnout_curr_en) { 442 dev_warn(&st->sd.spi->dev, 443 "Can't enable burnout currents: see CHOP or buffer\n"); 444 } 445 446 ret = ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode); 447 if (ret) 448 return ret; 449 450 ret = ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, st->conf); 451 if (ret) 452 return ret; 453 454 ret = ad7192_calibrate_all(st); 455 if (ret) 456 return ret; 457 458 /* Populate available ADC input ranges */ 459 for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) { 460 scale_uv = ((u64)st->int_vref_mv * 100000000) 461 >> (indio_dev->channels[0].scan_type.realbits - 462 !FIELD_GET(AD7192_CONF_UNIPOLAR, st->conf)); 463 scale_uv >>= i; 464 465 st->scale_avail[i][1] = do_div(scale_uv, 100000000) * 10; 466 st->scale_avail[i][0] = scale_uv; 467 } 468 469 st->oversampling_ratio_avail[0] = 1; 470 st->oversampling_ratio_avail[1] = 2; 471 st->oversampling_ratio_avail[2] = 8; 472 st->oversampling_ratio_avail[3] = 16; 473 474 return 0; 475} 476 477static ssize_t ad7192_show_ac_excitation(struct device *dev, 478 struct device_attribute *attr, 479 char *buf) 480{ 481 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 482 struct ad7192_state *st = iio_priv(indio_dev); 483 484 return sysfs_emit(buf, "%ld\n", FIELD_GET(AD7192_CONF_ACX, st->conf)); 485} 486 487static ssize_t ad7192_show_bridge_switch(struct device *dev, 488 struct device_attribute *attr, 489 char *buf) 490{ 491 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 492 struct ad7192_state *st = iio_priv(indio_dev); 493 494 return sysfs_emit(buf, "%ld\n", 495 FIELD_GET(AD7192_GPOCON_BPDSW, st->gpocon)); 496} 497 498static ssize_t ad7192_set(struct device *dev, 499 struct device_attribute *attr, 500 const char *buf, 501 size_t len) 502{ 503 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 504 struct ad7192_state *st = iio_priv(indio_dev); 505 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 506 int ret; 507 bool val; 508 509 ret = kstrtobool(buf, &val); 510 if (ret < 0) 511 return ret; 512 513 ret = iio_device_claim_direct_mode(indio_dev); 514 if (ret) 515 return ret; 516 517 switch ((u32)this_attr->address) { 518 case AD7192_REG_GPOCON: 519 if (val) 520 st->gpocon |= AD7192_GPOCON_BPDSW; 521 else 522 st->gpocon &= ~AD7192_GPOCON_BPDSW; 523 524 ad_sd_write_reg(&st->sd, AD7192_REG_GPOCON, 1, st->gpocon); 525 break; 526 case AD7192_REG_CONF: 527 if (val) 528 st->conf |= AD7192_CONF_ACX; 529 else 530 st->conf &= ~AD7192_CONF_ACX; 531 532 ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, st->conf); 533 break; 534 default: 535 ret = -EINVAL; 536 } 537 538 iio_device_release_direct_mode(indio_dev); 539 540 return ret ? ret : len; 541} 542 543static int ad7192_compute_f_order(struct ad7192_state *st, bool sinc3_en, bool chop_en) 544{ 545 u8 avg_factor_selected, oversampling_ratio; 546 547 avg_factor_selected = FIELD_GET(AD7192_MODE_AVG_MASK, st->mode); 548 549 if (!avg_factor_selected && !chop_en) 550 return 1; 551 552 oversampling_ratio = st->oversampling_ratio_avail[avg_factor_selected]; 553 554 if (sinc3_en) 555 return AD7192_SYNC3_FILTER + oversampling_ratio - 1; 556 557 return AD7192_SYNC4_FILTER + oversampling_ratio - 1; 558} 559 560static int ad7192_get_f_order(struct ad7192_state *st) 561{ 562 bool sinc3_en, chop_en; 563 564 sinc3_en = FIELD_GET(AD7192_MODE_SINC3, st->mode); 565 chop_en = FIELD_GET(AD7192_CONF_CHOP, st->conf); 566 567 return ad7192_compute_f_order(st, sinc3_en, chop_en); 568} 569 570static int ad7192_compute_f_adc(struct ad7192_state *st, bool sinc3_en, 571 bool chop_en) 572{ 573 unsigned int f_order = ad7192_compute_f_order(st, sinc3_en, chop_en); 574 575 return DIV_ROUND_CLOSEST(st->fclk, 576 f_order * FIELD_GET(AD7192_MODE_RATE_MASK, st->mode)); 577} 578 579static int ad7192_get_f_adc(struct ad7192_state *st) 580{ 581 unsigned int f_order = ad7192_get_f_order(st); 582 583 return DIV_ROUND_CLOSEST(st->fclk, 584 f_order * FIELD_GET(AD7192_MODE_RATE_MASK, st->mode)); 585} 586 587static void ad7192_get_available_filter_freq(struct ad7192_state *st, 588 int *freq) 589{ 590 unsigned int fadc; 591 592 /* Formulas for filter at page 25 of the datasheet */ 593 fadc = ad7192_compute_f_adc(st, false, true); 594 freq[0] = DIV_ROUND_CLOSEST(fadc * 240, 1024); 595 596 fadc = ad7192_compute_f_adc(st, true, true); 597 freq[1] = DIV_ROUND_CLOSEST(fadc * 240, 1024); 598 599 fadc = ad7192_compute_f_adc(st, false, false); 600 freq[2] = DIV_ROUND_CLOSEST(fadc * 230, 1024); 601 602 fadc = ad7192_compute_f_adc(st, true, false); 603 freq[3] = DIV_ROUND_CLOSEST(fadc * 272, 1024); 604} 605 606static ssize_t ad7192_show_filter_avail(struct device *dev, 607 struct device_attribute *attr, 608 char *buf) 609{ 610 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 611 struct ad7192_state *st = iio_priv(indio_dev); 612 unsigned int freq_avail[4], i; 613 size_t len = 0; 614 615 ad7192_get_available_filter_freq(st, freq_avail); 616 617 for (i = 0; i < ARRAY_SIZE(freq_avail); i++) 618 len += sysfs_emit_at(buf, len, "%d.%03d ", freq_avail[i] / 1000, 619 freq_avail[i] % 1000); 620 621 buf[len - 1] = '\n'; 622 623 return len; 624} 625 626static IIO_DEVICE_ATTR(filter_low_pass_3db_frequency_available, 627 0444, ad7192_show_filter_avail, NULL, 0); 628 629static IIO_DEVICE_ATTR(bridge_switch_en, 0644, 630 ad7192_show_bridge_switch, ad7192_set, 631 AD7192_REG_GPOCON); 632 633static IIO_DEVICE_ATTR(ac_excitation_en, 0644, 634 ad7192_show_ac_excitation, ad7192_set, 635 AD7192_REG_CONF); 636 637static struct attribute *ad7192_attributes[] = { 638 &iio_dev_attr_filter_low_pass_3db_frequency_available.dev_attr.attr, 639 &iio_dev_attr_bridge_switch_en.dev_attr.attr, 640 NULL 641}; 642 643static const struct attribute_group ad7192_attribute_group = { 644 .attrs = ad7192_attributes, 645}; 646 647static struct attribute *ad7195_attributes[] = { 648 &iio_dev_attr_filter_low_pass_3db_frequency_available.dev_attr.attr, 649 &iio_dev_attr_bridge_switch_en.dev_attr.attr, 650 &iio_dev_attr_ac_excitation_en.dev_attr.attr, 651 NULL 652}; 653 654static const struct attribute_group ad7195_attribute_group = { 655 .attrs = ad7195_attributes, 656}; 657 658static unsigned int ad7192_get_temp_scale(bool unipolar) 659{ 660 return unipolar ? 2815 * 2 : 2815; 661} 662 663static int ad7192_set_3db_filter_freq(struct ad7192_state *st, 664 int val, int val2) 665{ 666 int freq_avail[4], i, ret, freq; 667 unsigned int diff_new, diff_old; 668 int idx = 0; 669 670 diff_old = U32_MAX; 671 freq = val * 1000 + val2; 672 673 ad7192_get_available_filter_freq(st, freq_avail); 674 675 for (i = 0; i < ARRAY_SIZE(freq_avail); i++) { 676 diff_new = abs(freq - freq_avail[i]); 677 if (diff_new < diff_old) { 678 diff_old = diff_new; 679 idx = i; 680 } 681 } 682 683 switch (idx) { 684 case 0: 685 st->mode &= ~AD7192_MODE_SINC3; 686 687 st->conf |= AD7192_CONF_CHOP; 688 break; 689 case 1: 690 st->mode |= AD7192_MODE_SINC3; 691 692 st->conf |= AD7192_CONF_CHOP; 693 break; 694 case 2: 695 st->mode &= ~AD7192_MODE_SINC3; 696 697 st->conf &= ~AD7192_CONF_CHOP; 698 break; 699 case 3: 700 st->mode |= AD7192_MODE_SINC3; 701 702 st->conf &= ~AD7192_CONF_CHOP; 703 break; 704 } 705 706 ret = ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode); 707 if (ret < 0) 708 return ret; 709 710 return ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, st->conf); 711} 712 713static int ad7192_get_3db_filter_freq(struct ad7192_state *st) 714{ 715 unsigned int fadc; 716 717 fadc = ad7192_get_f_adc(st); 718 719 if (FIELD_GET(AD7192_CONF_CHOP, st->conf)) 720 return DIV_ROUND_CLOSEST(fadc * 240, 1024); 721 if (FIELD_GET(AD7192_MODE_SINC3, st->mode)) 722 return DIV_ROUND_CLOSEST(fadc * 272, 1024); 723 else 724 return DIV_ROUND_CLOSEST(fadc * 230, 1024); 725} 726 727static int ad7192_read_raw(struct iio_dev *indio_dev, 728 struct iio_chan_spec const *chan, 729 int *val, 730 int *val2, 731 long m) 732{ 733 struct ad7192_state *st = iio_priv(indio_dev); 734 bool unipolar = FIELD_GET(AD7192_CONF_UNIPOLAR, st->conf); 735 u8 gain = FIELD_GET(AD7192_CONF_GAIN_MASK, st->conf); 736 737 switch (m) { 738 case IIO_CHAN_INFO_RAW: 739 return ad_sigma_delta_single_conversion(indio_dev, chan, val); 740 case IIO_CHAN_INFO_SCALE: 741 switch (chan->type) { 742 case IIO_VOLTAGE: 743 mutex_lock(&st->lock); 744 *val = st->scale_avail[gain][0]; 745 *val2 = st->scale_avail[gain][1]; 746 mutex_unlock(&st->lock); 747 return IIO_VAL_INT_PLUS_NANO; 748 case IIO_TEMP: 749 *val = 0; 750 *val2 = 1000000000 / ad7192_get_temp_scale(unipolar); 751 return IIO_VAL_INT_PLUS_NANO; 752 default: 753 return -EINVAL; 754 } 755 case IIO_CHAN_INFO_OFFSET: 756 if (!unipolar) 757 *val = -(1 << (chan->scan_type.realbits - 1)); 758 else 759 *val = 0; 760 /* Kelvin to Celsius */ 761 if (chan->type == IIO_TEMP) 762 *val -= 273 * ad7192_get_temp_scale(unipolar); 763 return IIO_VAL_INT; 764 case IIO_CHAN_INFO_SAMP_FREQ: 765 *val = DIV_ROUND_CLOSEST(ad7192_get_f_adc(st), 1024); 766 return IIO_VAL_INT; 767 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: 768 *val = ad7192_get_3db_filter_freq(st); 769 *val2 = 1000; 770 return IIO_VAL_FRACTIONAL; 771 case IIO_CHAN_INFO_OVERSAMPLING_RATIO: 772 *val = st->oversampling_ratio_avail[FIELD_GET(AD7192_MODE_AVG_MASK, st->mode)]; 773 return IIO_VAL_INT; 774 } 775 776 return -EINVAL; 777} 778 779static int ad7192_write_raw(struct iio_dev *indio_dev, 780 struct iio_chan_spec const *chan, 781 int val, 782 int val2, 783 long mask) 784{ 785 struct ad7192_state *st = iio_priv(indio_dev); 786 int ret, i, div; 787 unsigned int tmp; 788 789 ret = iio_device_claim_direct_mode(indio_dev); 790 if (ret) 791 return ret; 792 793 switch (mask) { 794 case IIO_CHAN_INFO_SCALE: 795 ret = -EINVAL; 796 mutex_lock(&st->lock); 797 for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) 798 if (val2 == st->scale_avail[i][1]) { 799 ret = 0; 800 tmp = st->conf; 801 st->conf &= ~AD7192_CONF_GAIN_MASK; 802 st->conf |= FIELD_PREP(AD7192_CONF_GAIN_MASK, i); 803 if (tmp == st->conf) 804 break; 805 ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 806 3, st->conf); 807 ad7192_calibrate_all(st); 808 break; 809 } 810 mutex_unlock(&st->lock); 811 break; 812 case IIO_CHAN_INFO_SAMP_FREQ: 813 if (!val) { 814 ret = -EINVAL; 815 break; 816 } 817 818 div = st->fclk / (val * ad7192_get_f_order(st) * 1024); 819 if (div < 1 || div > 1023) { 820 ret = -EINVAL; 821 break; 822 } 823 824 st->mode &= ~AD7192_MODE_RATE_MASK; 825 st->mode |= FIELD_PREP(AD7192_MODE_RATE_MASK, div); 826 ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode); 827 break; 828 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: 829 ret = ad7192_set_3db_filter_freq(st, val, val2 / 1000); 830 break; 831 case IIO_CHAN_INFO_OVERSAMPLING_RATIO: 832 ret = -EINVAL; 833 mutex_lock(&st->lock); 834 for (i = 0; i < ARRAY_SIZE(st->oversampling_ratio_avail); i++) 835 if (val == st->oversampling_ratio_avail[i]) { 836 ret = 0; 837 tmp = st->mode; 838 st->mode &= ~AD7192_MODE_AVG_MASK; 839 st->mode |= FIELD_PREP(AD7192_MODE_AVG_MASK, i); 840 if (tmp == st->mode) 841 break; 842 ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 843 3, st->mode); 844 break; 845 } 846 mutex_unlock(&st->lock); 847 break; 848 default: 849 ret = -EINVAL; 850 } 851 852 iio_device_release_direct_mode(indio_dev); 853 854 return ret; 855} 856 857static int ad7192_write_raw_get_fmt(struct iio_dev *indio_dev, 858 struct iio_chan_spec const *chan, 859 long mask) 860{ 861 switch (mask) { 862 case IIO_CHAN_INFO_SCALE: 863 return IIO_VAL_INT_PLUS_NANO; 864 case IIO_CHAN_INFO_SAMP_FREQ: 865 return IIO_VAL_INT; 866 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: 867 return IIO_VAL_INT_PLUS_MICRO; 868 case IIO_CHAN_INFO_OVERSAMPLING_RATIO: 869 return IIO_VAL_INT; 870 default: 871 return -EINVAL; 872 } 873} 874 875static int ad7192_read_avail(struct iio_dev *indio_dev, 876 struct iio_chan_spec const *chan, 877 const int **vals, int *type, int *length, 878 long mask) 879{ 880 struct ad7192_state *st = iio_priv(indio_dev); 881 882 switch (mask) { 883 case IIO_CHAN_INFO_SCALE: 884 *vals = (int *)st->scale_avail; 885 *type = IIO_VAL_INT_PLUS_NANO; 886 /* Values are stored in a 2D matrix */ 887 *length = ARRAY_SIZE(st->scale_avail) * 2; 888 889 return IIO_AVAIL_LIST; 890 case IIO_CHAN_INFO_OVERSAMPLING_RATIO: 891 *vals = (int *)st->oversampling_ratio_avail; 892 *type = IIO_VAL_INT; 893 *length = ARRAY_SIZE(st->oversampling_ratio_avail); 894 895 return IIO_AVAIL_LIST; 896 } 897 898 return -EINVAL; 899} 900 901static int ad7192_update_scan_mode(struct iio_dev *indio_dev, const unsigned long *scan_mask) 902{ 903 struct ad7192_state *st = iio_priv(indio_dev); 904 u32 conf = st->conf; 905 int ret; 906 int i; 907 908 conf &= ~AD7192_CONF_CHAN_MASK; 909 for_each_set_bit(i, scan_mask, 8) 910 conf |= FIELD_PREP(AD7192_CONF_CHAN_MASK, i); 911 912 ret = ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, conf); 913 if (ret < 0) 914 return ret; 915 916 st->conf = conf; 917 918 return 0; 919} 920 921static const struct iio_info ad7192_info = { 922 .read_raw = ad7192_read_raw, 923 .write_raw = ad7192_write_raw, 924 .write_raw_get_fmt = ad7192_write_raw_get_fmt, 925 .read_avail = ad7192_read_avail, 926 .attrs = &ad7192_attribute_group, 927 .validate_trigger = ad_sd_validate_trigger, 928 .update_scan_mode = ad7192_update_scan_mode, 929}; 930 931static const struct iio_info ad7195_info = { 932 .read_raw = ad7192_read_raw, 933 .write_raw = ad7192_write_raw, 934 .write_raw_get_fmt = ad7192_write_raw_get_fmt, 935 .read_avail = ad7192_read_avail, 936 .attrs = &ad7195_attribute_group, 937 .validate_trigger = ad_sd_validate_trigger, 938 .update_scan_mode = ad7192_update_scan_mode, 939}; 940 941#define __AD719x_CHANNEL(_si, _channel1, _channel2, _address, _type, \ 942 _mask_all, _mask_type_av, _mask_all_av, _ext_info) \ 943 { \ 944 .type = (_type), \ 945 .differential = ((_channel2) == -1 ? 0 : 1), \ 946 .indexed = 1, \ 947 .channel = (_channel1), \ 948 .channel2 = (_channel2), \ 949 .address = (_address), \ 950 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ 951 BIT(IIO_CHAN_INFO_OFFSET), \ 952 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ 953 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ 954 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY) | \ 955 (_mask_all), \ 956 .info_mask_shared_by_type_available = (_mask_type_av), \ 957 .info_mask_shared_by_all_available = (_mask_all_av), \ 958 .ext_info = (_ext_info), \ 959 .scan_index = (_si), \ 960 .scan_type = { \ 961 .sign = 'u', \ 962 .realbits = 24, \ 963 .storagebits = 32, \ 964 .endianness = IIO_BE, \ 965 }, \ 966 } 967 968#define AD719x_DIFF_CHANNEL(_si, _channel1, _channel2, _address) \ 969 __AD719x_CHANNEL(_si, _channel1, _channel2, _address, IIO_VOLTAGE, 0, \ 970 BIT(IIO_CHAN_INFO_SCALE), 0, ad7192_calibsys_ext_info) 971 972#define AD719x_CHANNEL(_si, _channel1, _address) \ 973 __AD719x_CHANNEL(_si, _channel1, -1, _address, IIO_VOLTAGE, 0, \ 974 BIT(IIO_CHAN_INFO_SCALE), 0, ad7192_calibsys_ext_info) 975 976#define AD719x_TEMP_CHANNEL(_si, _address) \ 977 __AD719x_CHANNEL(_si, 0, -1, _address, IIO_TEMP, 0, 0, 0, NULL) 978 979#define AD7193_DIFF_CHANNEL(_si, _channel1, _channel2, _address) \ 980 __AD719x_CHANNEL(_si, _channel1, _channel2, _address, \ 981 IIO_VOLTAGE, \ 982 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \ 983 BIT(IIO_CHAN_INFO_SCALE), \ 984 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \ 985 ad7192_calibsys_ext_info) 986 987#define AD7193_CHANNEL(_si, _channel1, _address) \ 988 AD7193_DIFF_CHANNEL(_si, _channel1, -1, _address) 989 990static const struct iio_chan_spec ad7192_channels[] = { 991 AD719x_DIFF_CHANNEL(0, 1, 2, AD7192_CH_AIN1P_AIN2M), 992 AD719x_DIFF_CHANNEL(1, 3, 4, AD7192_CH_AIN3P_AIN4M), 993 AD719x_TEMP_CHANNEL(2, AD7192_CH_TEMP), 994 AD719x_DIFF_CHANNEL(3, 2, 2, AD7192_CH_AIN2P_AIN2M), 995 AD719x_CHANNEL(4, 1, AD7192_CH_AIN1), 996 AD719x_CHANNEL(5, 2, AD7192_CH_AIN2), 997 AD719x_CHANNEL(6, 3, AD7192_CH_AIN3), 998 AD719x_CHANNEL(7, 4, AD7192_CH_AIN4), 999 IIO_CHAN_SOFT_TIMESTAMP(8), 1000}; 1001 1002static const struct iio_chan_spec ad7193_channels[] = { 1003 AD7193_DIFF_CHANNEL(0, 1, 2, AD7193_CH_AIN1P_AIN2M), 1004 AD7193_DIFF_CHANNEL(1, 3, 4, AD7193_CH_AIN3P_AIN4M), 1005 AD7193_DIFF_CHANNEL(2, 5, 6, AD7193_CH_AIN5P_AIN6M), 1006 AD7193_DIFF_CHANNEL(3, 7, 8, AD7193_CH_AIN7P_AIN8M), 1007 AD719x_TEMP_CHANNEL(4, AD7193_CH_TEMP), 1008 AD7193_DIFF_CHANNEL(5, 2, 2, AD7193_CH_AIN2P_AIN2M), 1009 AD7193_CHANNEL(6, 1, AD7193_CH_AIN1), 1010 AD7193_CHANNEL(7, 2, AD7193_CH_AIN2), 1011 AD7193_CHANNEL(8, 3, AD7193_CH_AIN3), 1012 AD7193_CHANNEL(9, 4, AD7193_CH_AIN4), 1013 AD7193_CHANNEL(10, 5, AD7193_CH_AIN5), 1014 AD7193_CHANNEL(11, 6, AD7193_CH_AIN6), 1015 AD7193_CHANNEL(12, 7, AD7193_CH_AIN7), 1016 AD7193_CHANNEL(13, 8, AD7193_CH_AIN8), 1017 IIO_CHAN_SOFT_TIMESTAMP(14), 1018}; 1019 1020static const struct ad7192_chip_info ad7192_chip_info_tbl[] = { 1021 [ID_AD7190] = { 1022 .chip_id = CHIPID_AD7190, 1023 .name = "ad7190", 1024 .channels = ad7192_channels, 1025 .num_channels = ARRAY_SIZE(ad7192_channels), 1026 .info = &ad7192_info, 1027 }, 1028 [ID_AD7192] = { 1029 .chip_id = CHIPID_AD7192, 1030 .name = "ad7192", 1031 .channels = ad7192_channels, 1032 .num_channels = ARRAY_SIZE(ad7192_channels), 1033 .info = &ad7192_info, 1034 }, 1035 [ID_AD7193] = { 1036 .chip_id = CHIPID_AD7193, 1037 .name = "ad7193", 1038 .channels = ad7193_channels, 1039 .num_channels = ARRAY_SIZE(ad7193_channels), 1040 .info = &ad7192_info, 1041 }, 1042 [ID_AD7195] = { 1043 .chip_id = CHIPID_AD7195, 1044 .name = "ad7195", 1045 .channels = ad7192_channels, 1046 .num_channels = ARRAY_SIZE(ad7192_channels), 1047 .info = &ad7195_info, 1048 }, 1049}; 1050 1051static void ad7192_reg_disable(void *reg) 1052{ 1053 regulator_disable(reg); 1054} 1055 1056static int ad7192_probe(struct spi_device *spi) 1057{ 1058 struct ad7192_state *st; 1059 struct iio_dev *indio_dev; 1060 int ret; 1061 1062 if (!spi->irq) { 1063 dev_err(&spi->dev, "no IRQ?\n"); 1064 return -ENODEV; 1065 } 1066 1067 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); 1068 if (!indio_dev) 1069 return -ENOMEM; 1070 1071 st = iio_priv(indio_dev); 1072 1073 mutex_init(&st->lock); 1074 1075 st->avdd = devm_regulator_get(&spi->dev, "avdd"); 1076 if (IS_ERR(st->avdd)) 1077 return PTR_ERR(st->avdd); 1078 1079 ret = regulator_enable(st->avdd); 1080 if (ret) { 1081 dev_err(&spi->dev, "Failed to enable specified AVdd supply\n"); 1082 return ret; 1083 } 1084 1085 ret = devm_add_action_or_reset(&spi->dev, ad7192_reg_disable, st->avdd); 1086 if (ret) 1087 return ret; 1088 1089 ret = devm_regulator_get_enable(&spi->dev, "dvdd"); 1090 if (ret) 1091 return dev_err_probe(&spi->dev, ret, "Failed to enable specified DVdd supply\n"); 1092 1093 st->vref = devm_regulator_get_optional(&spi->dev, "vref"); 1094 if (IS_ERR(st->vref)) { 1095 if (PTR_ERR(st->vref) != -ENODEV) 1096 return PTR_ERR(st->vref); 1097 1098 ret = regulator_get_voltage(st->avdd); 1099 if (ret < 0) 1100 return dev_err_probe(&spi->dev, ret, 1101 "Device tree error, AVdd voltage undefined\n"); 1102 } else { 1103 ret = regulator_enable(st->vref); 1104 if (ret) { 1105 dev_err(&spi->dev, "Failed to enable specified Vref supply\n"); 1106 return ret; 1107 } 1108 1109 ret = devm_add_action_or_reset(&spi->dev, ad7192_reg_disable, st->vref); 1110 if (ret) 1111 return ret; 1112 1113 ret = regulator_get_voltage(st->vref); 1114 if (ret < 0) 1115 return dev_err_probe(&spi->dev, ret, 1116 "Device tree error, Vref voltage undefined\n"); 1117 } 1118 st->int_vref_mv = ret / 1000; 1119 1120 st->chip_info = of_device_get_match_data(&spi->dev); 1121 if (!st->chip_info) 1122 st->chip_info = (void *)spi_get_device_id(spi)->driver_data; 1123 indio_dev->name = st->chip_info->name; 1124 indio_dev->modes = INDIO_DIRECT_MODE; 1125 indio_dev->channels = st->chip_info->channels; 1126 indio_dev->num_channels = st->chip_info->num_channels; 1127 indio_dev->info = st->chip_info->info; 1128 1129 ret = ad_sd_init(&st->sd, indio_dev, spi, &ad7192_sigma_delta_info); 1130 if (ret) 1131 return ret; 1132 1133 ret = devm_ad_sd_setup_buffer_and_trigger(&spi->dev, indio_dev); 1134 if (ret) 1135 return ret; 1136 1137 st->fclk = AD7192_INT_FREQ_MHZ; 1138 1139 st->mclk = devm_clk_get_optional_enabled(&spi->dev, "mclk"); 1140 if (IS_ERR(st->mclk)) 1141 return PTR_ERR(st->mclk); 1142 1143 st->clock_sel = ad7192_of_clock_select(st); 1144 1145 if (st->clock_sel == AD7192_CLK_EXT_MCLK1_2 || 1146 st->clock_sel == AD7192_CLK_EXT_MCLK2) { 1147 st->fclk = clk_get_rate(st->mclk); 1148 if (!ad7192_valid_external_frequency(st->fclk)) { 1149 dev_err(&spi->dev, 1150 "External clock frequency out of bounds\n"); 1151 return -EINVAL; 1152 } 1153 } 1154 1155 ret = ad7192_setup(indio_dev, spi->dev.of_node); 1156 if (ret) 1157 return ret; 1158 1159 return devm_iio_device_register(&spi->dev, indio_dev); 1160} 1161 1162static const struct of_device_id ad7192_of_match[] = { 1163 { .compatible = "adi,ad7190", .data = &ad7192_chip_info_tbl[ID_AD7190] }, 1164 { .compatible = "adi,ad7192", .data = &ad7192_chip_info_tbl[ID_AD7192] }, 1165 { .compatible = "adi,ad7193", .data = &ad7192_chip_info_tbl[ID_AD7193] }, 1166 { .compatible = "adi,ad7195", .data = &ad7192_chip_info_tbl[ID_AD7195] }, 1167 {} 1168}; 1169MODULE_DEVICE_TABLE(of, ad7192_of_match); 1170 1171static const struct spi_device_id ad7192_ids[] = { 1172 { "ad7190", (kernel_ulong_t)&ad7192_chip_info_tbl[ID_AD7190] }, 1173 { "ad7192", (kernel_ulong_t)&ad7192_chip_info_tbl[ID_AD7192] }, 1174 { "ad7193", (kernel_ulong_t)&ad7192_chip_info_tbl[ID_AD7193] }, 1175 { "ad7195", (kernel_ulong_t)&ad7192_chip_info_tbl[ID_AD7195] }, 1176 {} 1177}; 1178MODULE_DEVICE_TABLE(spi, ad7192_ids); 1179 1180static struct spi_driver ad7192_driver = { 1181 .driver = { 1182 .name = "ad7192", 1183 .of_match_table = ad7192_of_match, 1184 }, 1185 .probe = ad7192_probe, 1186 .id_table = ad7192_ids, 1187}; 1188module_spi_driver(ad7192_driver); 1189 1190MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); 1191MODULE_DESCRIPTION("Analog Devices AD7190, AD7192, AD7193, AD7195 ADC"); 1192MODULE_LICENSE("GPL v2"); 1193MODULE_IMPORT_NS(IIO_AD_SIGMA_DELTA); 1194