1934 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (C) 2022 Analog Devices, Inc.4 * Author: Cosmin Tanislav <cosmin.tanislav@analog.com>5 */6 7#include <linux/bitfield.h>8#include <linux/bitops.h>9#include <linux/crc8.h>10#include <linux/device.h>11#include <linux/gpio/driver.h>12#include <linux/interrupt.h>13#include <linux/module.h>14#include <linux/regmap.h>15#include <linux/regulator/consumer.h>16#include <linux/spi/spi.h>17#include <linux/units.h>18 19#include <linux/unaligned.h>20 21#include <linux/iio/buffer.h>22#include <linux/iio/iio.h>23#include <linux/iio/trigger.h>24#include <linux/iio/trigger_consumer.h>25#include <linux/iio/triggered_buffer.h>26 27#define AD74115_NAME "ad74115"28 29#define AD74115_CH_FUNC_SETUP_REG 0x0130 31#define AD74115_ADC_CONFIG_REG 0x0232#define AD74115_ADC_CONFIG_CONV2_RATE_MASK GENMASK(15, 13)33#define AD74115_ADC_CONFIG_CONV1_RATE_MASK GENMASK(12, 10)34#define AD74115_ADC_CONFIG_CONV2_RANGE_MASK GENMASK(9, 7)35#define AD74115_ADC_CONFIG_CONV1_RANGE_MASK GENMASK(6, 4)36 37#define AD74115_PWR_OPTIM_CONFIG_REG 0x0338 39#define AD74115_DIN_CONFIG1_REG 0x0440#define AD74115_DIN_COMPARATOR_EN_MASK BIT(13)41#define AD74115_DIN_SINK_MASK GENMASK(11, 7)42#define AD74115_DIN_DEBOUNCE_MASK GENMASK(4, 0)43 44#define AD74115_DIN_CONFIG2_REG 0x0545#define AD74115_COMP_THRESH_MASK GENMASK(6, 0)46 47#define AD74115_OUTPUT_CONFIG_REG 0x0648#define AD74115_OUTPUT_SLEW_EN_MASK GENMASK(6, 5)49#define AD74115_OUTPUT_SLEW_LIN_STEP_MASK GENMASK(4, 3)50#define AD74115_OUTPUT_SLEW_LIN_RATE_MASK GENMASK(2, 1)51 52#define AD74115_RTD3W4W_CONFIG_REG 0x0753 54#define AD74115_BURNOUT_CONFIG_REG 0x0a55#define AD74115_BURNOUT_EXT2_EN_MASK BIT(10)56#define AD74115_BURNOUT_EXT1_EN_MASK BIT(5)57#define AD74115_BURNOUT_VIOUT_EN_MASK BIT(0)58 59#define AD74115_DAC_CODE_REG 0x0b60 61#define AD74115_DAC_ACTIVE_REG 0x0d62 63#define AD74115_GPIO_CONFIG_X_REG(x) (0x35 + (x))64#define AD74115_GPIO_CONFIG_GPI_DATA BIT(5)65#define AD74115_GPIO_CONFIG_GPO_DATA BIT(4)66#define AD74115_GPIO_CONFIG_SELECT_MASK GENMASK(2, 0)67 68#define AD74115_CHARGE_PUMP_REG 0x3a69 70#define AD74115_ADC_CONV_CTRL_REG 0x3b71#define AD74115_ADC_CONV_SEQ_MASK GENMASK(13, 12)72 73#define AD74115_DIN_COMP_OUT_REG 0x4074 75#define AD74115_LIVE_STATUS_REG 0x4276#define AD74115_ADC_DATA_RDY_MASK BIT(3)77 78#define AD74115_READ_SELECT_REG 0x6479 80#define AD74115_CMD_KEY_REG 0x7881#define AD74115_CMD_KEY_RESET1 0x15fa82#define AD74115_CMD_KEY_RESET2 0xaf5183 84#define AD74115_CRC_POLYNOMIAL 0x785DECLARE_CRC8_TABLE(ad74115_crc8_table);86 87#define AD74115_ADC_CODE_MAX ((int)GENMASK(15, 0))88#define AD74115_ADC_CODE_HALF (AD74115_ADC_CODE_MAX / 2)89 90#define AD74115_DAC_VOLTAGE_MAX 1200091#define AD74115_DAC_CURRENT_MAX 2592#define AD74115_DAC_CODE_MAX ((int)GENMASK(13, 0))93#define AD74115_DAC_CODE_HALF (AD74115_DAC_CODE_MAX / 2)94 95#define AD74115_COMP_THRESH_MAX 9896 97#define AD74115_SENSE_RESISTOR_OHMS 10098#define AD74115_REF_RESISTOR_OHMS 210099 100#define AD74115_DIN_SINK_LOW_STEP 120101#define AD74115_DIN_SINK_HIGH_STEP 240102#define AD74115_DIN_SINK_MAX 31103 104#define AD74115_FRAME_SIZE 4105#define AD74115_GPIO_NUM 4106 107#define AD74115_CONV_TIME_US 1000000108 109enum ad74115_dac_ch {110 AD74115_DAC_CH_MAIN,111 AD74115_DAC_CH_COMPARATOR,112};113 114enum ad74115_adc_ch {115 AD74115_ADC_CH_CONV1,116 AD74115_ADC_CH_CONV2,117 AD74115_ADC_CH_NUM118};119 120enum ad74115_ch_func {121 AD74115_CH_FUNC_HIGH_IMPEDANCE,122 AD74115_CH_FUNC_VOLTAGE_OUTPUT,123 AD74115_CH_FUNC_CURRENT_OUTPUT,124 AD74115_CH_FUNC_VOLTAGE_INPUT,125 AD74115_CH_FUNC_CURRENT_INPUT_EXT_POWER,126 AD74115_CH_FUNC_CURRENT_INPUT_LOOP_POWER,127 AD74115_CH_FUNC_2_WIRE_RESISTANCE_INPUT,128 AD74115_CH_FUNC_3_4_WIRE_RESISTANCE_INPUT,129 AD74115_CH_FUNC_DIGITAL_INPUT_LOGIC,130 AD74115_CH_FUNC_DIGITAL_INPUT_LOOP_POWER,131 AD74115_CH_FUNC_CURRENT_OUTPUT_HART,132 AD74115_CH_FUNC_CURRENT_INPUT_EXT_POWER_HART,133 AD74115_CH_FUNC_CURRENT_INPUT_LOOP_POWER_HART,134 AD74115_CH_FUNC_MAX = AD74115_CH_FUNC_CURRENT_INPUT_LOOP_POWER_HART,135 AD74115_CH_FUNC_NUM136};137 138enum ad74115_adc_range {139 AD74115_ADC_RANGE_12V,140 AD74115_ADC_RANGE_12V_BIPOLAR,141 AD74115_ADC_RANGE_2_5V_BIPOLAR,142 AD74115_ADC_RANGE_2_5V_NEG,143 AD74115_ADC_RANGE_2_5V,144 AD74115_ADC_RANGE_0_625V,145 AD74115_ADC_RANGE_104MV_BIPOLAR,146 AD74115_ADC_RANGE_12V_OTHER,147 AD74115_ADC_RANGE_MAX = AD74115_ADC_RANGE_12V_OTHER,148 AD74115_ADC_RANGE_NUM149};150 151enum ad74115_adc_conv_seq {152 AD74115_ADC_CONV_SEQ_STANDBY = 0b00,153 AD74115_ADC_CONV_SEQ_SINGLE = 0b01,154 AD74115_ADC_CONV_SEQ_CONTINUOUS = 0b10,155};156 157enum ad74115_din_threshold_mode {158 AD74115_DIN_THRESHOLD_MODE_AVDD,159 AD74115_DIN_THRESHOLD_MODE_FIXED,160 AD74115_DIN_THRESHOLD_MODE_MAX = AD74115_DIN_THRESHOLD_MODE_FIXED,161};162 163enum ad74115_slew_mode {164 AD74115_SLEW_MODE_DISABLED,165 AD74115_SLEW_MODE_LINEAR,166 AD74115_SLEW_MODE_HART,167};168 169enum ad74115_slew_step {170 AD74115_SLEW_STEP_0_8_PERCENT,171 AD74115_SLEW_STEP_1_5_PERCENT,172 AD74115_SLEW_STEP_6_1_PERCENT,173 AD74115_SLEW_STEP_22_2_PERCENT,174};175 176enum ad74115_slew_rate {177 AD74115_SLEW_RATE_4KHZ,178 AD74115_SLEW_RATE_64KHZ,179 AD74115_SLEW_RATE_150KHZ,180 AD74115_SLEW_RATE_240KHZ,181};182 183enum ad74115_gpio_config {184 AD74115_GPIO_CONFIG_OUTPUT_BUFFERED = 0b010,185 AD74115_GPIO_CONFIG_INPUT = 0b011,186};187 188enum ad74115_gpio_mode {189 AD74115_GPIO_MODE_LOGIC = 1,190 AD74115_GPIO_MODE_SPECIAL = 2,191};192 193struct ad74115_channels {194 struct iio_chan_spec *channels;195 unsigned int num_channels;196};197 198struct ad74115_state {199 struct spi_device *spi;200 struct regmap *regmap;201 struct iio_trigger *trig;202 203 /*204 * Synchronize consecutive operations when doing a one-shot205 * conversion and when updating the ADC samples SPI message.206 */207 struct mutex lock;208 struct gpio_chip gc;209 struct gpio_chip comp_gc;210 int irq;211 212 unsigned int avdd_mv;213 unsigned long gpio_valid_mask;214 bool dac_bipolar;215 bool dac_hart_slew;216 bool rtd_mode_4_wire;217 enum ad74115_ch_func ch_func;218 enum ad74115_din_threshold_mode din_threshold_mode;219 220 struct completion adc_data_completion;221 struct spi_message adc_samples_msg;222 struct spi_transfer adc_samples_xfer[AD74115_ADC_CH_NUM + 1];223 224 /*225 * DMA (thus cache coherency maintenance) requires the226 * transfer buffers to live in their own cache lines.227 */228 u8 reg_tx_buf[AD74115_FRAME_SIZE] __aligned(IIO_DMA_MINALIGN);229 u8 reg_rx_buf[AD74115_FRAME_SIZE];230 u8 adc_samples_tx_buf[AD74115_FRAME_SIZE * AD74115_ADC_CH_NUM];231 u8 adc_samples_rx_buf[AD74115_FRAME_SIZE * AD74115_ADC_CH_NUM];232};233 234struct ad74115_fw_prop {235 const char *name;236 bool is_boolean;237 bool negate;238 unsigned int max;239 unsigned int reg;240 unsigned int mask;241 const unsigned int *lookup_tbl;242 unsigned int lookup_tbl_len;243};244 245#define AD74115_FW_PROP(_name, _max, _reg, _mask) \246{ \247 .name = (_name), \248 .max = (_max), \249 .reg = (_reg), \250 .mask = (_mask), \251}252 253#define AD74115_FW_PROP_TBL(_name, _tbl, _reg, _mask) \254{ \255 .name = (_name), \256 .reg = (_reg), \257 .mask = (_mask), \258 .lookup_tbl = (_tbl), \259 .lookup_tbl_len = ARRAY_SIZE(_tbl), \260}261 262#define AD74115_FW_PROP_BOOL(_name, _reg, _mask) \263{ \264 .name = (_name), \265 .is_boolean = true, \266 .reg = (_reg), \267 .mask = (_mask), \268}269 270#define AD74115_FW_PROP_BOOL_NEG(_name, _reg, _mask) \271{ \272 .name = (_name), \273 .is_boolean = true, \274 .negate = true, \275 .reg = (_reg), \276 .mask = (_mask), \277}278 279static const int ad74115_dac_rate_tbl[] = {280 0,281 4 * 8,282 4 * 15,283 4 * 61,284 4 * 222,285 64 * 8,286 64 * 15,287 64 * 61,288 64 * 222,289 150 * 8,290 150 * 15,291 150 * 61,292 150 * 222,293 240 * 8,294 240 * 15,295 240 * 61,296 240 * 222,297};298 299static const unsigned int ad74115_dac_rate_step_tbl[][3] = {300 { AD74115_SLEW_MODE_DISABLED },301 { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_0_8_PERCENT, AD74115_SLEW_RATE_4KHZ },302 { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_1_5_PERCENT, AD74115_SLEW_RATE_4KHZ },303 { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_6_1_PERCENT, AD74115_SLEW_RATE_4KHZ },304 { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_22_2_PERCENT, AD74115_SLEW_RATE_4KHZ },305 { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_0_8_PERCENT, AD74115_SLEW_RATE_64KHZ },306 { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_1_5_PERCENT, AD74115_SLEW_RATE_64KHZ },307 { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_6_1_PERCENT, AD74115_SLEW_RATE_64KHZ },308 { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_22_2_PERCENT, AD74115_SLEW_RATE_64KHZ },309 { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_0_8_PERCENT, AD74115_SLEW_RATE_150KHZ },310 { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_1_5_PERCENT, AD74115_SLEW_RATE_150KHZ },311 { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_6_1_PERCENT, AD74115_SLEW_RATE_150KHZ },312 { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_22_2_PERCENT, AD74115_SLEW_RATE_150KHZ },313 { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_0_8_PERCENT, AD74115_SLEW_RATE_240KHZ },314 { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_1_5_PERCENT, AD74115_SLEW_RATE_240KHZ },315 { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_6_1_PERCENT, AD74115_SLEW_RATE_240KHZ },316 { AD74115_SLEW_MODE_LINEAR, AD74115_SLEW_STEP_22_2_PERCENT, AD74115_SLEW_RATE_240KHZ },317};318 319static const unsigned int ad74115_rtd_excitation_current_ua_tbl[] = {320 250, 500, 750, 1000321};322 323static const unsigned int ad74115_burnout_current_na_tbl[] = {324 0, 50, 0, 500, 1000, 0, 10000, 0325};326 327static const unsigned int ad74115_viout_burnout_current_na_tbl[] = {328 0, 0, 0, 0, 1000, 0, 10000, 0329};330 331static const unsigned int ad74115_gpio_mode_tbl[] = {332 0, 0, 0, 1, 2, 3, 4, 5333};334 335static const unsigned int ad74115_adc_conv_rate_tbl[] = {336 10, 20, 1200, 4800, 9600337};338 339static const unsigned int ad74115_debounce_tbl[] = {340 0, 13, 18, 24, 32, 42, 56, 75,341 100, 130, 180, 240, 320, 420, 560, 750,342 1000, 1300, 1800, 2400, 3200, 4200, 5600, 7500,343 10000, 13000, 18000, 24000, 32000, 42000, 56000, 75000,344};345 346static const unsigned int ad74115_adc_ch_data_regs_tbl[] = {347 [AD74115_ADC_CH_CONV1] = 0x44,348 [AD74115_ADC_CH_CONV2] = 0x46,349};350 351static const unsigned int ad74115_adc_ch_en_bit_tbl[] = {352 [AD74115_ADC_CH_CONV1] = BIT(0),353 [AD74115_ADC_CH_CONV2] = BIT(1),354};355 356static const bool ad74115_adc_bipolar_tbl[AD74115_ADC_RANGE_NUM] = {357 [AD74115_ADC_RANGE_12V_BIPOLAR] = true,358 [AD74115_ADC_RANGE_2_5V_BIPOLAR] = true,359 [AD74115_ADC_RANGE_104MV_BIPOLAR] = true,360};361 362static const unsigned int ad74115_adc_conv_mul_tbl[AD74115_ADC_RANGE_NUM] = {363 [AD74115_ADC_RANGE_12V] = 12000,364 [AD74115_ADC_RANGE_12V_BIPOLAR] = 24000,365 [AD74115_ADC_RANGE_2_5V_BIPOLAR] = 5000,366 [AD74115_ADC_RANGE_2_5V_NEG] = 2500,367 [AD74115_ADC_RANGE_2_5V] = 2500,368 [AD74115_ADC_RANGE_0_625V] = 625,369 [AD74115_ADC_RANGE_104MV_BIPOLAR] = 208,370 [AD74115_ADC_RANGE_12V_OTHER] = 12000,371};372 373static const unsigned int ad74115_adc_gain_tbl[AD74115_ADC_RANGE_NUM][2] = {374 [AD74115_ADC_RANGE_12V] = { 5, 24 },375 [AD74115_ADC_RANGE_12V_BIPOLAR] = { 5, 24 },376 [AD74115_ADC_RANGE_2_5V_BIPOLAR] = { 1, 1 },377 [AD74115_ADC_RANGE_2_5V_NEG] = { 1, 1 },378 [AD74115_ADC_RANGE_2_5V] = { 1, 1 },379 [AD74115_ADC_RANGE_0_625V] = { 4, 1 },380 [AD74115_ADC_RANGE_104MV_BIPOLAR] = { 24, 1 },381 [AD74115_ADC_RANGE_12V_OTHER] = { 5, 24 },382};383 384static const int ad74115_adc_range_tbl[AD74115_ADC_RANGE_NUM][2] = {385 [AD74115_ADC_RANGE_12V] = { 0, 12000000 },386 [AD74115_ADC_RANGE_12V_BIPOLAR] = { -12000000, 12000000 },387 [AD74115_ADC_RANGE_2_5V_BIPOLAR] = { -2500000, 2500000 },388 [AD74115_ADC_RANGE_2_5V_NEG] = { -2500000, 0 },389 [AD74115_ADC_RANGE_2_5V] = { 0, 2500000 },390 [AD74115_ADC_RANGE_0_625V] = { 0, 625000 },391 [AD74115_ADC_RANGE_104MV_BIPOLAR] = { -104000, 104000 },392 [AD74115_ADC_RANGE_12V_OTHER] = { 0, 12000000 },393};394 395static int _ad74115_find_tbl_index(const unsigned int *tbl, unsigned int tbl_len,396 unsigned int val, unsigned int *index)397{398 unsigned int i;399 400 for (i = 0; i < tbl_len; i++)401 if (val == tbl[i]) {402 *index = i;403 return 0;404 }405 406 return -EINVAL;407}408 409#define ad74115_find_tbl_index(tbl, val, index) \410 _ad74115_find_tbl_index(tbl, ARRAY_SIZE(tbl), val, index)411 412static int ad74115_crc(u8 *buf)413{414 return crc8(ad74115_crc8_table, buf, 3, 0);415}416 417static void ad74115_format_reg_write(u8 reg, u16 val, u8 *buf)418{419 buf[0] = reg;420 put_unaligned_be16(val, &buf[1]);421 buf[3] = ad74115_crc(buf);422}423 424static int ad74115_reg_write(void *context, unsigned int reg, unsigned int val)425{426 struct ad74115_state *st = context;427 428 ad74115_format_reg_write(reg, val, st->reg_tx_buf);429 430 return spi_write(st->spi, st->reg_tx_buf, AD74115_FRAME_SIZE);431}432 433static int ad74115_crc_check(struct ad74115_state *st, u8 *buf)434{435 struct device *dev = &st->spi->dev;436 u8 expected_crc = ad74115_crc(buf);437 438 if (buf[3] != expected_crc) {439 dev_err(dev, "Bad CRC %02x for %02x%02x%02x, expected %02x\n",440 buf[3], buf[0], buf[1], buf[2], expected_crc);441 return -EINVAL;442 }443 444 return 0;445}446 447static int ad74115_reg_read(void *context, unsigned int reg, unsigned int *val)448{449 struct ad74115_state *st = context;450 struct spi_transfer reg_read_xfer[] = {451 {452 .tx_buf = st->reg_tx_buf,453 .len = sizeof(st->reg_tx_buf),454 .cs_change = 1,455 },456 {457 .rx_buf = st->reg_rx_buf,458 .len = sizeof(st->reg_rx_buf),459 },460 };461 int ret;462 463 ad74115_format_reg_write(AD74115_READ_SELECT_REG, reg, st->reg_tx_buf);464 465 ret = spi_sync_transfer(st->spi, reg_read_xfer, ARRAY_SIZE(reg_read_xfer));466 if (ret)467 return ret;468 469 ret = ad74115_crc_check(st, st->reg_rx_buf);470 if (ret)471 return ret;472 473 *val = get_unaligned_be16(&st->reg_rx_buf[1]);474 475 return 0;476}477 478static const struct regmap_config ad74115_regmap_config = {479 .reg_bits = 8,480 .val_bits = 16,481 .reg_read = ad74115_reg_read,482 .reg_write = ad74115_reg_write,483};484 485static int ad74115_gpio_config_set(struct ad74115_state *st, unsigned int offset,486 enum ad74115_gpio_config cfg)487{488 return regmap_update_bits(st->regmap, AD74115_GPIO_CONFIG_X_REG(offset),489 AD74115_GPIO_CONFIG_SELECT_MASK,490 FIELD_PREP(AD74115_GPIO_CONFIG_SELECT_MASK, cfg));491}492 493static int ad74115_gpio_init_valid_mask(struct gpio_chip *gc,494 unsigned long *valid_mask,495 unsigned int ngpios)496{497 struct ad74115_state *st = gpiochip_get_data(gc);498 499 *valid_mask = st->gpio_valid_mask;500 501 return 0;502}503 504static int ad74115_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)505{506 struct ad74115_state *st = gpiochip_get_data(gc);507 unsigned int val;508 int ret;509 510 ret = regmap_read(st->regmap, AD74115_GPIO_CONFIG_X_REG(offset), &val);511 if (ret)512 return ret;513 514 return FIELD_GET(AD74115_GPIO_CONFIG_SELECT_MASK, val) == AD74115_GPIO_CONFIG_INPUT;515}516 517static int ad74115_gpio_direction_input(struct gpio_chip *gc, unsigned int offset)518{519 struct ad74115_state *st = gpiochip_get_data(gc);520 521 return ad74115_gpio_config_set(st, offset, AD74115_GPIO_CONFIG_INPUT);522}523 524static int ad74115_gpio_direction_output(struct gpio_chip *gc, unsigned int offset,525 int value)526{527 struct ad74115_state *st = gpiochip_get_data(gc);528 529 return ad74115_gpio_config_set(st, offset, AD74115_GPIO_CONFIG_OUTPUT_BUFFERED);530}531 532static int ad74115_gpio_get(struct gpio_chip *gc, unsigned int offset)533{534 struct ad74115_state *st = gpiochip_get_data(gc);535 unsigned int val;536 int ret;537 538 ret = regmap_read(st->regmap, AD74115_GPIO_CONFIG_X_REG(offset), &val);539 if (ret)540 return ret;541 542 return FIELD_GET(AD74115_GPIO_CONFIG_GPI_DATA, val);543}544 545static void ad74115_gpio_set(struct gpio_chip *gc, unsigned int offset, int value)546{547 struct ad74115_state *st = gpiochip_get_data(gc);548 struct device *dev = &st->spi->dev;549 int ret;550 551 ret = regmap_update_bits(st->regmap, AD74115_GPIO_CONFIG_X_REG(offset),552 AD74115_GPIO_CONFIG_GPO_DATA,553 FIELD_PREP(AD74115_GPIO_CONFIG_GPO_DATA, value));554 if (ret)555 dev_err(dev, "Failed to set GPIO %u output value, err: %d\n",556 offset, ret);557}558 559static int ad74115_set_comp_debounce(struct ad74115_state *st, unsigned int val)560{561 unsigned int len = ARRAY_SIZE(ad74115_debounce_tbl);562 unsigned int i;563 564 for (i = 0; i < len; i++)565 if (val <= ad74115_debounce_tbl[i])566 break;567 568 if (i == len)569 i = len - 1;570 571 return regmap_update_bits(st->regmap, AD74115_DIN_CONFIG1_REG,572 AD74115_DIN_DEBOUNCE_MASK,573 FIELD_PREP(AD74115_DIN_DEBOUNCE_MASK, val));574}575 576static int ad74115_comp_gpio_get_direction(struct gpio_chip *chip,577 unsigned int offset)578{579 return GPIO_LINE_DIRECTION_IN;580}581 582static int ad74115_comp_gpio_set_config(struct gpio_chip *chip,583 unsigned int offset,584 unsigned long config)585{586 struct ad74115_state *st = gpiochip_get_data(chip);587 u32 param = pinconf_to_config_param(config);588 u32 arg = pinconf_to_config_argument(config);589 590 switch (param) {591 case PIN_CONFIG_INPUT_DEBOUNCE:592 return ad74115_set_comp_debounce(st, arg);593 default:594 return -ENOTSUPP;595 }596}597 598static int ad74115_comp_gpio_get(struct gpio_chip *chip, unsigned int offset)599{600 struct ad74115_state *st = gpiochip_get_data(chip);601 unsigned int val;602 int ret;603 604 ret = regmap_read(st->regmap, AD74115_DIN_COMP_OUT_REG, &val);605 if (ret)606 return ret;607 608 return !!val;609}610 611static irqreturn_t ad74115_trigger_handler(int irq, void *p)612{613 struct iio_poll_func *pf = p;614 struct iio_dev *indio_dev = pf->indio_dev;615 struct ad74115_state *st = iio_priv(indio_dev);616 int ret;617 618 ret = spi_sync(st->spi, &st->adc_samples_msg);619 if (ret)620 goto out;621 622 iio_push_to_buffers(indio_dev, st->adc_samples_rx_buf);623 624out:625 iio_trigger_notify_done(indio_dev->trig);626 627 return IRQ_HANDLED;628}629 630static irqreturn_t ad74115_adc_data_interrupt(int irq, void *data)631{632 struct iio_dev *indio_dev = data;633 struct ad74115_state *st = iio_priv(indio_dev);634 635 if (iio_buffer_enabled(indio_dev))636 iio_trigger_poll(st->trig);637 else638 complete(&st->adc_data_completion);639 640 return IRQ_HANDLED;641}642 643static int ad74115_set_adc_ch_en(struct ad74115_state *st,644 enum ad74115_adc_ch channel, bool status)645{646 unsigned int mask = ad74115_adc_ch_en_bit_tbl[channel];647 648 return regmap_update_bits(st->regmap, AD74115_ADC_CONV_CTRL_REG, mask,649 status ? mask : 0);650}651 652static int ad74115_set_adc_conv_seq(struct ad74115_state *st,653 enum ad74115_adc_conv_seq conv_seq)654{655 return regmap_update_bits(st->regmap, AD74115_ADC_CONV_CTRL_REG,656 AD74115_ADC_CONV_SEQ_MASK,657 FIELD_PREP(AD74115_ADC_CONV_SEQ_MASK, conv_seq));658}659 660static int ad74115_update_scan_mode(struct iio_dev *indio_dev,661 const unsigned long *active_scan_mask)662{663 struct ad74115_state *st = iio_priv(indio_dev);664 struct spi_transfer *xfer = st->adc_samples_xfer;665 u8 *rx_buf = st->adc_samples_rx_buf;666 u8 *tx_buf = st->adc_samples_tx_buf;667 unsigned int i;668 int ret = 0;669 670 mutex_lock(&st->lock);671 672 spi_message_init(&st->adc_samples_msg);673 674 for_each_clear_bit(i, active_scan_mask, AD74115_ADC_CH_NUM) {675 ret = ad74115_set_adc_ch_en(st, i, false);676 if (ret)677 goto out;678 }679 680 /*681 * The read select register is used to select which register's value682 * will be sent by the slave on the next SPI frame.683 *684 * Create an SPI message that, on each step, writes to the read select685 * register to select the ADC result of the next enabled channel, and686 * reads the ADC result of the previous enabled channel.687 *688 * Example:689 * W: [WCH1] [WCH2] [WCH2] [WCH3] [ ]690 * R: [ ] [RCH1] [RCH2] [RCH3] [RCH4]691 */692 for_each_set_bit(i, active_scan_mask, AD74115_ADC_CH_NUM) {693 ret = ad74115_set_adc_ch_en(st, i, true);694 if (ret)695 goto out;696 697 if (xfer == st->adc_samples_xfer)698 xfer->rx_buf = NULL;699 else700 xfer->rx_buf = rx_buf;701 702 xfer->tx_buf = tx_buf;703 xfer->len = AD74115_FRAME_SIZE;704 xfer->cs_change = 1;705 706 ad74115_format_reg_write(AD74115_READ_SELECT_REG,707 ad74115_adc_ch_data_regs_tbl[i], tx_buf);708 709 spi_message_add_tail(xfer, &st->adc_samples_msg);710 711 tx_buf += AD74115_FRAME_SIZE;712 if (xfer != st->adc_samples_xfer)713 rx_buf += AD74115_FRAME_SIZE;714 xfer++;715 }716 717 xfer->rx_buf = rx_buf;718 xfer->tx_buf = NULL;719 xfer->len = AD74115_FRAME_SIZE;720 xfer->cs_change = 0;721 722 spi_message_add_tail(xfer, &st->adc_samples_msg);723 724out:725 mutex_unlock(&st->lock);726 727 return ret;728}729 730static int ad74115_buffer_postenable(struct iio_dev *indio_dev)731{732 struct ad74115_state *st = iio_priv(indio_dev);733 734 return ad74115_set_adc_conv_seq(st, AD74115_ADC_CONV_SEQ_CONTINUOUS);735}736 737static int ad74115_buffer_predisable(struct iio_dev *indio_dev)738{739 struct ad74115_state *st = iio_priv(indio_dev);740 unsigned int i;741 int ret;742 743 mutex_lock(&st->lock);744 745 ret = ad74115_set_adc_conv_seq(st, AD74115_ADC_CONV_SEQ_STANDBY);746 if (ret)747 goto out;748 749 /*750 * update_scan_mode() is not called in the disable path, disable all751 * channels here.752 */753 for (i = 0; i < AD74115_ADC_CH_NUM; i++) {754 ret = ad74115_set_adc_ch_en(st, i, false);755 if (ret)756 goto out;757 }758 759out:760 mutex_unlock(&st->lock);761 762 return ret;763}764 765static const struct iio_buffer_setup_ops ad74115_buffer_ops = {766 .postenable = &ad74115_buffer_postenable,767 .predisable = &ad74115_buffer_predisable,768};769 770static const struct iio_trigger_ops ad74115_trigger_ops = {771 .validate_device = iio_trigger_validate_own_device,772};773 774static int ad74115_get_adc_rate(struct ad74115_state *st,775 enum ad74115_adc_ch channel, int *val)776{777 unsigned int i;778 int ret;779 780 ret = regmap_read(st->regmap, AD74115_ADC_CONFIG_REG, &i);781 if (ret)782 return ret;783 784 if (channel == AD74115_ADC_CH_CONV1)785 i = FIELD_GET(AD74115_ADC_CONFIG_CONV1_RATE_MASK, i);786 else787 i = FIELD_GET(AD74115_ADC_CONFIG_CONV2_RATE_MASK, i);788 789 *val = ad74115_adc_conv_rate_tbl[i];790 791 return IIO_VAL_INT;792}793 794static int _ad74115_get_adc_code(struct ad74115_state *st,795 enum ad74115_adc_ch channel, int *val)796{797 unsigned int uval;798 int ret;799 800 reinit_completion(&st->adc_data_completion);801 802 ret = ad74115_set_adc_ch_en(st, channel, true);803 if (ret)804 return ret;805 806 ret = ad74115_set_adc_conv_seq(st, AD74115_ADC_CONV_SEQ_SINGLE);807 if (ret)808 return ret;809 810 if (st->irq) {811 ret = wait_for_completion_timeout(&st->adc_data_completion,812 msecs_to_jiffies(1000));813 if (!ret)814 return -ETIMEDOUT;815 } else {816 unsigned int regval, wait_time;817 int rate;818 819 ret = ad74115_get_adc_rate(st, channel, &rate);820 if (ret < 0)821 return ret;822 823 wait_time = DIV_ROUND_CLOSEST(AD74115_CONV_TIME_US, rate);824 825 ret = regmap_read_poll_timeout(st->regmap, AD74115_LIVE_STATUS_REG,826 regval, regval & AD74115_ADC_DATA_RDY_MASK,827 wait_time, 5 * wait_time);828 if (ret)829 return ret;830 831 /*832 * The ADC_DATA_RDY bit is W1C.833 * See datasheet page 98, Table 62. Bit Descriptions for834 * LIVE_STATUS.835 * Although the datasheet mentions that the bit will auto-clear836 * when writing to the ADC_CONV_CTRL register, this does not837 * seem to happen.838 */839 ret = regmap_write_bits(st->regmap, AD74115_LIVE_STATUS_REG,840 AD74115_ADC_DATA_RDY_MASK,841 FIELD_PREP(AD74115_ADC_DATA_RDY_MASK, 1));842 if (ret)843 return ret;844 }845 846 ret = regmap_read(st->regmap, ad74115_adc_ch_data_regs_tbl[channel], &uval);847 if (ret)848 return ret;849 850 ret = ad74115_set_adc_conv_seq(st, AD74115_ADC_CONV_SEQ_STANDBY);851 if (ret)852 return ret;853 854 ret = ad74115_set_adc_ch_en(st, channel, false);855 if (ret)856 return ret;857 858 *val = uval;859 860 return IIO_VAL_INT;861}862 863static int ad74115_get_adc_code(struct iio_dev *indio_dev,864 enum ad74115_adc_ch channel, int *val)865{866 struct ad74115_state *st = iio_priv(indio_dev);867 int ret;868 869 ret = iio_device_claim_direct_mode(indio_dev);870 if (ret)871 return ret;872 873 mutex_lock(&st->lock);874 ret = _ad74115_get_adc_code(st, channel, val);875 mutex_unlock(&st->lock);876 877 iio_device_release_direct_mode(indio_dev);878 879 return ret;880}881 882static int ad74115_adc_code_to_resistance(int code, int *val, int *val2)883{884 if (code == AD74115_ADC_CODE_MAX)885 code--;886 887 *val = code * AD74115_REF_RESISTOR_OHMS;888 *val2 = AD74115_ADC_CODE_MAX - code;889 890 return IIO_VAL_FRACTIONAL;891}892 893static int ad74115_set_dac_code(struct ad74115_state *st,894 enum ad74115_dac_ch channel, int val)895{896 if (val < 0)897 return -EINVAL;898 899 if (channel == AD74115_DAC_CH_COMPARATOR) {900 if (val > AD74115_COMP_THRESH_MAX)901 return -EINVAL;902 903 return regmap_update_bits(st->regmap, AD74115_DIN_CONFIG2_REG,904 AD74115_COMP_THRESH_MASK,905 FIELD_PREP(AD74115_COMP_THRESH_MASK, val));906 }907 908 if (val > AD74115_DAC_CODE_MAX)909 return -EINVAL;910 911 return regmap_write(st->regmap, AD74115_DAC_CODE_REG, val);912}913 914static int ad74115_get_dac_code(struct ad74115_state *st,915 enum ad74115_dac_ch channel, int *val)916{917 unsigned int uval;918 int ret;919 920 if (channel == AD74115_DAC_CH_COMPARATOR)921 return -EINVAL;922 923 ret = regmap_read(st->regmap, AD74115_DAC_ACTIVE_REG, &uval);924 if (ret)925 return ret;926 927 *val = uval;928 929 return IIO_VAL_INT;930}931 932static int ad74115_set_adc_rate(struct ad74115_state *st,933 enum ad74115_adc_ch channel, int val)934{935 unsigned int i;936 int ret;937 938 ret = ad74115_find_tbl_index(ad74115_adc_conv_rate_tbl, val, &i);939 if (ret)940 return ret;941 942 if (channel == AD74115_ADC_CH_CONV1)943 return regmap_update_bits(st->regmap, AD74115_ADC_CONFIG_REG,944 AD74115_ADC_CONFIG_CONV1_RATE_MASK,945 FIELD_PREP(AD74115_ADC_CONFIG_CONV1_RATE_MASK, i));946 947 return regmap_update_bits(st->regmap, AD74115_ADC_CONFIG_REG,948 AD74115_ADC_CONFIG_CONV2_RATE_MASK,949 FIELD_PREP(AD74115_ADC_CONFIG_CONV2_RATE_MASK, i));950}951 952static int ad74115_get_dac_rate(struct ad74115_state *st, int *val)953{954 unsigned int i, en_val, step_val, rate_val, tmp;955 int ret;956 957 ret = regmap_read(st->regmap, AD74115_OUTPUT_CONFIG_REG, &tmp);958 if (ret)959 return ret;960 961 en_val = FIELD_GET(AD74115_OUTPUT_SLEW_EN_MASK, tmp);962 step_val = FIELD_GET(AD74115_OUTPUT_SLEW_LIN_STEP_MASK, tmp);963 rate_val = FIELD_GET(AD74115_OUTPUT_SLEW_LIN_RATE_MASK, tmp);964 965 for (i = 0; i < ARRAY_SIZE(ad74115_dac_rate_step_tbl); i++)966 if (en_val == ad74115_dac_rate_step_tbl[i][0] &&967 step_val == ad74115_dac_rate_step_tbl[i][1] &&968 rate_val == ad74115_dac_rate_step_tbl[i][2])969 break;970 971 if (i == ARRAY_SIZE(ad74115_dac_rate_step_tbl))972 return -EINVAL;973 974 *val = ad74115_dac_rate_tbl[i];975 976 return IIO_VAL_INT;977}978 979static int ad74115_set_dac_rate(struct ad74115_state *st, int val)980{981 unsigned int i, en_val, step_val, rate_val, mask, tmp;982 int ret;983 984 ret = ad74115_find_tbl_index(ad74115_dac_rate_tbl, val, &i);985 if (ret)986 return ret;987 988 en_val = ad74115_dac_rate_step_tbl[i][0];989 step_val = ad74115_dac_rate_step_tbl[i][1];990 rate_val = ad74115_dac_rate_step_tbl[i][2];991 992 mask = AD74115_OUTPUT_SLEW_EN_MASK;993 mask |= AD74115_OUTPUT_SLEW_LIN_STEP_MASK;994 mask |= AD74115_OUTPUT_SLEW_LIN_RATE_MASK;995 996 tmp = FIELD_PREP(AD74115_OUTPUT_SLEW_EN_MASK, en_val);997 tmp |= FIELD_PREP(AD74115_OUTPUT_SLEW_LIN_STEP_MASK, step_val);998 tmp |= FIELD_PREP(AD74115_OUTPUT_SLEW_LIN_RATE_MASK, rate_val);999 1000 return regmap_update_bits(st->regmap, AD74115_OUTPUT_CONFIG_REG, mask, tmp);1001}1002 1003static int ad74115_get_dac_scale(struct ad74115_state *st,1004 struct iio_chan_spec const *chan,1005 int *val, int *val2)1006{1007 if (chan->channel == AD74115_DAC_CH_MAIN) {1008 if (chan->type == IIO_VOLTAGE) {1009 *val = AD74115_DAC_VOLTAGE_MAX;1010 1011 if (st->dac_bipolar)1012 *val *= 2;1013 1014 } else {1015 *val = AD74115_DAC_CURRENT_MAX;1016 }1017 1018 *val2 = AD74115_DAC_CODE_MAX;1019 } else {1020 if (st->din_threshold_mode == AD74115_DIN_THRESHOLD_MODE_AVDD) {1021 *val = 196 * st->avdd_mv;1022 *val2 = 10 * AD74115_COMP_THRESH_MAX;1023 } else {1024 *val = 49000;1025 *val2 = AD74115_COMP_THRESH_MAX;1026 }1027 }1028 1029 return IIO_VAL_FRACTIONAL;1030}1031 1032static int ad74115_get_dac_offset(struct ad74115_state *st,1033 struct iio_chan_spec const *chan, int *val)1034{1035 if (chan->channel == AD74115_DAC_CH_MAIN) {1036 if (chan->type == IIO_VOLTAGE && st->dac_bipolar)1037 *val = -AD74115_DAC_CODE_HALF;1038 else1039 *val = 0;1040 } else {1041 if (st->din_threshold_mode == AD74115_DIN_THRESHOLD_MODE_AVDD)1042 *val = -48;1043 else1044 *val = -38;1045 }1046 1047 return IIO_VAL_INT;1048}1049 1050static int ad74115_get_adc_range(struct ad74115_state *st,1051 enum ad74115_adc_ch channel, unsigned int *val)1052{1053 int ret;1054 1055 ret = regmap_read(st->regmap, AD74115_ADC_CONFIG_REG, val);1056 if (ret)1057 return ret;1058 1059 if (channel == AD74115_ADC_CH_CONV1)1060 *val = FIELD_GET(AD74115_ADC_CONFIG_CONV1_RANGE_MASK, *val);1061 else1062 *val = FIELD_GET(AD74115_ADC_CONFIG_CONV2_RANGE_MASK, *val);1063 1064 return 0;1065}1066 1067static int ad74115_get_adc_resistance_scale(struct ad74115_state *st,1068 unsigned int range,1069 int *val, int *val2)1070{1071 *val = ad74115_adc_gain_tbl[range][1] * AD74115_REF_RESISTOR_OHMS;1072 *val2 = ad74115_adc_gain_tbl[range][0];1073 1074 if (ad74115_adc_bipolar_tbl[range])1075 *val2 *= AD74115_ADC_CODE_HALF;1076 else1077 *val2 *= AD74115_ADC_CODE_MAX;1078 1079 return IIO_VAL_FRACTIONAL;1080}1081 1082static int ad74115_get_adc_scale(struct ad74115_state *st,1083 struct iio_chan_spec const *chan,1084 int *val, int *val2)1085{1086 unsigned int range;1087 int ret;1088 1089 ret = ad74115_get_adc_range(st, chan->channel, &range);1090 if (ret)1091 return ret;1092 1093 if (chan->type == IIO_RESISTANCE)1094 return ad74115_get_adc_resistance_scale(st, range, val, val2);1095 1096 *val = ad74115_adc_conv_mul_tbl[range];1097 *val2 = AD74115_ADC_CODE_MAX;1098 1099 if (chan->type == IIO_CURRENT)1100 *val2 *= AD74115_SENSE_RESISTOR_OHMS;1101 1102 return IIO_VAL_FRACTIONAL;1103}1104 1105static int ad74115_get_adc_resistance_offset(struct ad74115_state *st,1106 unsigned int range,1107 int *val, int *val2)1108{1109 unsigned int d = 10 * AD74115_REF_RESISTOR_OHMS1110 * ad74115_adc_gain_tbl[range][1];1111 1112 *val = 5;1113 1114 if (ad74115_adc_bipolar_tbl[range])1115 *val -= AD74115_ADC_CODE_HALF;1116 1117 *val *= d;1118 1119 if (!st->rtd_mode_4_wire) {1120 /* Add 0.2 Ohm to the final result for 3-wire RTD. */1121 unsigned int v = 2 * ad74115_adc_gain_tbl[range][0];1122 1123 if (ad74115_adc_bipolar_tbl[range])1124 v *= AD74115_ADC_CODE_HALF;1125 else1126 v *= AD74115_ADC_CODE_MAX;1127 1128 *val += v;1129 }1130 1131 *val2 = d;1132 1133 return IIO_VAL_FRACTIONAL;1134}1135 1136static int ad74115_get_adc_offset(struct ad74115_state *st,1137 struct iio_chan_spec const *chan,1138 int *val, int *val2)1139{1140 unsigned int range;1141 int ret;1142 1143 ret = ad74115_get_adc_range(st, chan->channel, &range);1144 if (ret)1145 return ret;1146 1147 if (chan->type == IIO_RESISTANCE)1148 return ad74115_get_adc_resistance_offset(st, range, val, val2);1149 1150 if (ad74115_adc_bipolar_tbl[range])1151 *val = -AD74115_ADC_CODE_HALF;1152 else if (range == AD74115_ADC_RANGE_2_5V_NEG)1153 *val = -AD74115_ADC_CODE_MAX;1154 else1155 *val = 0;1156 1157 return IIO_VAL_INT;1158}1159 1160static int ad74115_read_raw(struct iio_dev *indio_dev,1161 struct iio_chan_spec const *chan,1162 int *val, int *val2, long info)1163{1164 struct ad74115_state *st = iio_priv(indio_dev);1165 int ret;1166 1167 switch (info) {1168 case IIO_CHAN_INFO_RAW:1169 if (chan->output)1170 return ad74115_get_dac_code(st, chan->channel, val);1171 1172 return ad74115_get_adc_code(indio_dev, chan->channel, val);1173 case IIO_CHAN_INFO_PROCESSED:1174 ret = ad74115_get_adc_code(indio_dev, chan->channel, val);1175 if (ret)1176 return ret;1177 1178 return ad74115_adc_code_to_resistance(*val, val, val2);1179 case IIO_CHAN_INFO_SCALE:1180 if (chan->output)1181 return ad74115_get_dac_scale(st, chan, val, val2);1182 1183 return ad74115_get_adc_scale(st, chan, val, val2);1184 case IIO_CHAN_INFO_OFFSET:1185 if (chan->output)1186 return ad74115_get_dac_offset(st, chan, val);1187 1188 return ad74115_get_adc_offset(st, chan, val, val2);1189 case IIO_CHAN_INFO_SAMP_FREQ:1190 if (chan->output)1191 return ad74115_get_dac_rate(st, val);1192 1193 return ad74115_get_adc_rate(st, chan->channel, val);1194 default:1195 return -EINVAL;1196 }1197}1198 1199static int ad74115_write_raw(struct iio_dev *indio_dev,1200 struct iio_chan_spec const *chan, int val, int val2,1201 long info)1202{1203 struct ad74115_state *st = iio_priv(indio_dev);1204 1205 switch (info) {1206 case IIO_CHAN_INFO_RAW:1207 if (!chan->output)1208 return -EINVAL;1209 1210 return ad74115_set_dac_code(st, chan->channel, val);1211 case IIO_CHAN_INFO_SAMP_FREQ:1212 if (chan->output)1213 return ad74115_set_dac_rate(st, val);1214 1215 return ad74115_set_adc_rate(st, chan->channel, val);1216 default:1217 return -EINVAL;1218 }1219}1220 1221static int ad74115_read_avail(struct iio_dev *indio_dev,1222 struct iio_chan_spec const *chan,1223 const int **vals, int *type, int *length, long info)1224{1225 switch (info) {1226 case IIO_CHAN_INFO_SAMP_FREQ:1227 if (chan->output) {1228 *vals = ad74115_dac_rate_tbl;1229 *length = ARRAY_SIZE(ad74115_dac_rate_tbl);1230 } else {1231 *vals = ad74115_adc_conv_rate_tbl;1232 *length = ARRAY_SIZE(ad74115_adc_conv_rate_tbl);1233 }1234 1235 *type = IIO_VAL_INT;1236 1237 return IIO_AVAIL_LIST;1238 default:1239 return -EINVAL;1240 }1241}1242 1243static int ad74115_reg_access(struct iio_dev *indio_dev, unsigned int reg,1244 unsigned int writeval, unsigned int *readval)1245{1246 struct ad74115_state *st = iio_priv(indio_dev);1247 1248 if (readval)1249 return regmap_read(st->regmap, reg, readval);1250 1251 return regmap_write(st->regmap, reg, writeval);1252}1253 1254static const struct iio_info ad74115_info = {1255 .read_raw = ad74115_read_raw,1256 .write_raw = ad74115_write_raw,1257 .read_avail = ad74115_read_avail,1258 .update_scan_mode = ad74115_update_scan_mode,1259 .debugfs_reg_access = ad74115_reg_access,1260};1261 1262#define AD74115_DAC_CHANNEL(_type, index) \1263 { \1264 .type = (_type), \1265 .channel = (index), \1266 .indexed = 1, \1267 .output = 1, \1268 .scan_index = -1, \1269 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) \1270 | BIT(IIO_CHAN_INFO_SCALE) \1271 | BIT(IIO_CHAN_INFO_OFFSET), \1272 }1273 1274#define _AD74115_ADC_CHANNEL(_type, index, extra_mask_separate) \1275 { \1276 .type = (_type), \1277 .channel = (index), \1278 .indexed = 1, \1279 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) \1280 | BIT(IIO_CHAN_INFO_SAMP_FREQ) \1281 | (extra_mask_separate), \1282 .info_mask_separate_available = \1283 BIT(IIO_CHAN_INFO_SAMP_FREQ), \1284 .scan_index = index, \1285 .scan_type = { \1286 .sign = 'u', \1287 .realbits = 16, \1288 .storagebits = 32, \1289 .shift = 8, \1290 .endianness = IIO_BE, \1291 }, \1292 }1293 1294#define AD74115_ADC_CHANNEL(_type, index) \1295 _AD74115_ADC_CHANNEL(_type, index, BIT(IIO_CHAN_INFO_SCALE) \1296 | BIT(IIO_CHAN_INFO_OFFSET))1297 1298static struct iio_chan_spec ad74115_voltage_input_channels[] = {1299 AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV1),1300 AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV2),1301};1302 1303static struct iio_chan_spec ad74115_voltage_output_channels[] = {1304 AD74115_DAC_CHANNEL(IIO_VOLTAGE, AD74115_DAC_CH_MAIN),1305 AD74115_ADC_CHANNEL(IIO_CURRENT, AD74115_ADC_CH_CONV1),1306 AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV2),1307};1308 1309static struct iio_chan_spec ad74115_current_input_channels[] = {1310 AD74115_ADC_CHANNEL(IIO_CURRENT, AD74115_ADC_CH_CONV1),1311 AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV2),1312};1313 1314static struct iio_chan_spec ad74115_current_output_channels[] = {1315 AD74115_DAC_CHANNEL(IIO_CURRENT, AD74115_DAC_CH_MAIN),1316 AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV1),1317 AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV2),1318};1319 1320static struct iio_chan_spec ad74115_2_wire_resistance_input_channels[] = {1321 _AD74115_ADC_CHANNEL(IIO_RESISTANCE, AD74115_ADC_CH_CONV1,1322 BIT(IIO_CHAN_INFO_PROCESSED)),1323 AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV2),1324};1325 1326static struct iio_chan_spec ad74115_3_4_wire_resistance_input_channels[] = {1327 AD74115_ADC_CHANNEL(IIO_RESISTANCE, AD74115_ADC_CH_CONV1),1328 AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV2),1329};1330 1331static struct iio_chan_spec ad74115_digital_input_logic_channels[] = {1332 AD74115_DAC_CHANNEL(IIO_VOLTAGE, AD74115_DAC_CH_COMPARATOR),1333 AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV1),1334 AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV2),1335};1336 1337static struct iio_chan_spec ad74115_digital_input_loop_channels[] = {1338 AD74115_DAC_CHANNEL(IIO_CURRENT, AD74115_DAC_CH_MAIN),1339 AD74115_DAC_CHANNEL(IIO_VOLTAGE, AD74115_DAC_CH_COMPARATOR),1340 AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV1),1341 AD74115_ADC_CHANNEL(IIO_VOLTAGE, AD74115_ADC_CH_CONV2),1342};1343 1344#define _AD74115_CHANNELS(_channels) \1345 { \1346 .channels = _channels, \1347 .num_channels = ARRAY_SIZE(_channels), \1348 }1349 1350#define AD74115_CHANNELS(name) \1351 _AD74115_CHANNELS(ad74115_ ## name ## _channels)1352 1353static const struct ad74115_channels ad74115_channels_map[AD74115_CH_FUNC_NUM] = {1354 [AD74115_CH_FUNC_HIGH_IMPEDANCE] = AD74115_CHANNELS(voltage_input),1355 [AD74115_CH_FUNC_VOLTAGE_INPUT] = AD74115_CHANNELS(voltage_input),1356 1357 [AD74115_CH_FUNC_VOLTAGE_OUTPUT] = AD74115_CHANNELS(voltage_output),1358 1359 [AD74115_CH_FUNC_CURRENT_INPUT_EXT_POWER] = AD74115_CHANNELS(current_input),1360 [AD74115_CH_FUNC_CURRENT_INPUT_LOOP_POWER] = AD74115_CHANNELS(current_input),1361 [AD74115_CH_FUNC_CURRENT_INPUT_EXT_POWER_HART] = AD74115_CHANNELS(current_input),1362 [AD74115_CH_FUNC_CURRENT_INPUT_LOOP_POWER_HART] = AD74115_CHANNELS(current_input),1363 1364 [AD74115_CH_FUNC_CURRENT_OUTPUT] = AD74115_CHANNELS(current_output),1365 [AD74115_CH_FUNC_CURRENT_OUTPUT_HART] = AD74115_CHANNELS(current_output),1366 1367 [AD74115_CH_FUNC_2_WIRE_RESISTANCE_INPUT] = AD74115_CHANNELS(2_wire_resistance_input),1368 [AD74115_CH_FUNC_3_4_WIRE_RESISTANCE_INPUT] = AD74115_CHANNELS(3_4_wire_resistance_input),1369 1370 [AD74115_CH_FUNC_DIGITAL_INPUT_LOGIC] = AD74115_CHANNELS(digital_input_logic),1371 1372 [AD74115_CH_FUNC_DIGITAL_INPUT_LOOP_POWER] = AD74115_CHANNELS(digital_input_loop),1373};1374 1375#define AD74115_GPIO_MODE_FW_PROP(i) \1376{ \1377 .name = "adi,gpio" __stringify(i) "-mode", \1378 .reg = AD74115_GPIO_CONFIG_X_REG(i), \1379 .mask = AD74115_GPIO_CONFIG_SELECT_MASK, \1380 .lookup_tbl = ad74115_gpio_mode_tbl, \1381 .lookup_tbl_len = ARRAY_SIZE(ad74115_gpio_mode_tbl), \1382}1383 1384static const struct ad74115_fw_prop ad74115_gpio_mode_fw_props[] = {1385 AD74115_GPIO_MODE_FW_PROP(0),1386 AD74115_GPIO_MODE_FW_PROP(1),1387 AD74115_GPIO_MODE_FW_PROP(2),1388 AD74115_GPIO_MODE_FW_PROP(3),1389};1390 1391static const struct ad74115_fw_prop ad74115_din_threshold_mode_fw_prop =1392 AD74115_FW_PROP_BOOL("adi,digital-input-threshold-mode-fixed",1393 AD74115_DIN_CONFIG2_REG, BIT(7));1394 1395static const struct ad74115_fw_prop ad74115_dac_bipolar_fw_prop =1396 AD74115_FW_PROP_BOOL("adi,dac-bipolar", AD74115_OUTPUT_CONFIG_REG, BIT(7));1397 1398static const struct ad74115_fw_prop ad74115_ch_func_fw_prop =1399 AD74115_FW_PROP("adi,ch-func", AD74115_CH_FUNC_MAX,1400 AD74115_CH_FUNC_SETUP_REG, GENMASK(3, 0));1401 1402static const struct ad74115_fw_prop ad74115_rtd_mode_fw_prop =1403 AD74115_FW_PROP_BOOL("adi,4-wire-rtd", AD74115_RTD3W4W_CONFIG_REG, BIT(3));1404 1405static const struct ad74115_fw_prop ad74115_din_range_fw_prop =1406 AD74115_FW_PROP_BOOL("adi,digital-input-sink-range-high",1407 AD74115_DIN_CONFIG1_REG, BIT(12));1408 1409static const struct ad74115_fw_prop ad74115_ext2_burnout_current_fw_prop =1410 AD74115_FW_PROP_TBL("adi,ext2-burnout-current-nanoamp",1411 ad74115_burnout_current_na_tbl,1412 AD74115_BURNOUT_CONFIG_REG, GENMASK(14, 12));1413 1414static const struct ad74115_fw_prop ad74115_ext1_burnout_current_fw_prop =1415 AD74115_FW_PROP_TBL("adi,ext1-burnout-current-nanoamp",1416 ad74115_burnout_current_na_tbl,1417 AD74115_BURNOUT_CONFIG_REG, GENMASK(9, 7));1418 1419static const struct ad74115_fw_prop ad74115_viout_burnout_current_fw_prop =1420 AD74115_FW_PROP_TBL("adi,viout-burnout-current-nanoamp",1421 ad74115_viout_burnout_current_na_tbl,1422 AD74115_BURNOUT_CONFIG_REG, GENMASK(4, 2));1423 1424static const struct ad74115_fw_prop ad74115_fw_props[] = {1425 AD74115_FW_PROP("adi,conv2-mux", 3,1426 AD74115_ADC_CONFIG_REG, GENMASK(3, 2)),1427 1428 AD74115_FW_PROP_BOOL_NEG("adi,sense-agnd-buffer-low-power",1429 AD74115_PWR_OPTIM_CONFIG_REG, BIT(4)),1430 AD74115_FW_PROP_BOOL_NEG("adi,lf-buffer-low-power",1431 AD74115_PWR_OPTIM_CONFIG_REG, BIT(3)),1432 AD74115_FW_PROP_BOOL_NEG("adi,hf-buffer-low-power",1433 AD74115_PWR_OPTIM_CONFIG_REG, BIT(2)),1434 AD74115_FW_PROP_BOOL_NEG("adi,ext2-buffer-low-power",1435 AD74115_PWR_OPTIM_CONFIG_REG, BIT(1)),1436 AD74115_FW_PROP_BOOL_NEG("adi,ext1-buffer-low-power",1437 AD74115_PWR_OPTIM_CONFIG_REG, BIT(0)),1438 1439 AD74115_FW_PROP_BOOL("adi,comparator-invert",1440 AD74115_DIN_CONFIG1_REG, BIT(14)),1441 AD74115_FW_PROP_BOOL("adi,digital-input-debounce-mode-counter-reset",1442 AD74115_DIN_CONFIG1_REG, BIT(6)),1443 1444 AD74115_FW_PROP_BOOL("adi,digital-input-unbuffered",1445 AD74115_DIN_CONFIG2_REG, BIT(10)),1446 AD74115_FW_PROP_BOOL("adi,digital-input-short-circuit-detection",1447 AD74115_DIN_CONFIG2_REG, BIT(9)),1448 AD74115_FW_PROP_BOOL("adi,digital-input-open-circuit-detection",1449 AD74115_DIN_CONFIG2_REG, BIT(8)),1450 1451 AD74115_FW_PROP_BOOL("adi,dac-current-limit-low",1452 AD74115_OUTPUT_CONFIG_REG, BIT(0)),1453 1454 AD74115_FW_PROP_BOOL("adi,3-wire-rtd-excitation-swap",1455 AD74115_RTD3W4W_CONFIG_REG, BIT(2)),1456 AD74115_FW_PROP_TBL("adi,rtd-excitation-current-microamp",1457 ad74115_rtd_excitation_current_ua_tbl,1458 AD74115_RTD3W4W_CONFIG_REG, GENMASK(1, 0)),1459 1460 AD74115_FW_PROP_BOOL("adi,ext2-burnout-current-polarity-sourcing",1461 AD74115_BURNOUT_CONFIG_REG, BIT(11)),1462 AD74115_FW_PROP_BOOL("adi,ext1-burnout-current-polarity-sourcing",1463 AD74115_BURNOUT_CONFIG_REG, BIT(6)),1464 AD74115_FW_PROP_BOOL("adi,viout-burnout-current-polarity-sourcing",1465 AD74115_BURNOUT_CONFIG_REG, BIT(1)),1466 1467 AD74115_FW_PROP_BOOL("adi,charge-pump",1468 AD74115_CHARGE_PUMP_REG, BIT(0)),1469};1470 1471static int ad74115_apply_fw_prop(struct ad74115_state *st,1472 const struct ad74115_fw_prop *prop, u32 *retval)1473{1474 struct device *dev = &st->spi->dev;1475 u32 val = 0;1476 int ret;1477 1478 if (prop->is_boolean) {1479 val = device_property_read_bool(dev, prop->name);1480 } else {1481 ret = device_property_read_u32(dev, prop->name, &val);1482 if (ret && prop->lookup_tbl)1483 val = prop->lookup_tbl[0];1484 }1485 1486 *retval = val;1487 1488 if (prop->negate)1489 val = !val;1490 1491 if (prop->lookup_tbl)1492 ret = _ad74115_find_tbl_index(prop->lookup_tbl,1493 prop->lookup_tbl_len, val, &val);1494 else if (prop->max && val > prop->max)1495 ret = -EINVAL;1496 else1497 ret = 0;1498 1499 if (ret)1500 return dev_err_probe(dev, -EINVAL,1501 "Invalid value %u for prop %s\n",1502 val, prop->name);1503 1504 WARN(!prop->mask, "Prop %s mask is empty\n", prop->name);1505 1506 val = (val << __ffs(prop->mask)) & prop->mask;1507 1508 return regmap_update_bits(st->regmap, prop->reg, prop->mask, val);1509}1510 1511static int ad74115_setup_adc_conv2_range(struct ad74115_state *st)1512{1513 unsigned int tbl_len = ARRAY_SIZE(ad74115_adc_range_tbl);1514 const char *prop_name = "adi,conv2-range-microvolt";1515 s32 vals[2] = {1516 ad74115_adc_range_tbl[0][0],1517 ad74115_adc_range_tbl[0][1],1518 };1519 struct device *dev = &st->spi->dev;1520 unsigned int i;1521 1522 device_property_read_u32_array(dev, prop_name, vals, 2);1523 1524 for (i = 0; i < tbl_len; i++)1525 if (vals[0] == ad74115_adc_range_tbl[i][0] &&1526 vals[1] == ad74115_adc_range_tbl[i][1])1527 break;1528 1529 if (i == tbl_len)1530 return dev_err_probe(dev, -EINVAL,1531 "Invalid value %d, %d for prop %s\n",1532 vals[0], vals[1], prop_name);1533 1534 return regmap_update_bits(st->regmap, AD74115_ADC_CONFIG_REG,1535 AD74115_ADC_CONFIG_CONV2_RANGE_MASK,1536 FIELD_PREP(AD74115_ADC_CONFIG_CONV2_RANGE_MASK, i));1537}1538 1539static int ad74115_setup_iio_channels(struct iio_dev *indio_dev)1540{1541 struct ad74115_state *st = iio_priv(indio_dev);1542 struct device *dev = &st->spi->dev;1543 struct iio_chan_spec *channels;1544 1545 channels = devm_kcalloc(dev, sizeof(*channels),1546 indio_dev->num_channels, GFP_KERNEL);1547 if (!channels)1548 return -ENOMEM;1549 1550 indio_dev->channels = channels;1551 1552 memcpy(channels, ad74115_channels_map[st->ch_func].channels,1553 sizeof(*channels) * ad74115_channels_map[st->ch_func].num_channels);1554 1555 if (channels[0].output && channels[0].channel == AD74115_DAC_CH_MAIN &&1556 channels[0].type == IIO_VOLTAGE && !st->dac_hart_slew) {1557 channels[0].info_mask_separate |= BIT(IIO_CHAN_INFO_SAMP_FREQ);1558 channels[0].info_mask_separate_available |= BIT(IIO_CHAN_INFO_SAMP_FREQ);1559 }1560 1561 return 0;1562}1563 1564static int ad74115_setup_gpio_chip(struct ad74115_state *st)1565{1566 struct device *dev = &st->spi->dev;1567 1568 if (!st->gpio_valid_mask)1569 return 0;1570 1571 st->gc = (struct gpio_chip) {1572 .owner = THIS_MODULE,1573 .label = AD74115_NAME,1574 .base = -1,1575 .ngpio = AD74115_GPIO_NUM,1576 .parent = dev,1577 .can_sleep = true,1578 .init_valid_mask = ad74115_gpio_init_valid_mask,1579 .get_direction = ad74115_gpio_get_direction,1580 .direction_input = ad74115_gpio_direction_input,1581 .direction_output = ad74115_gpio_direction_output,1582 .get = ad74115_gpio_get,1583 .set = ad74115_gpio_set,1584 };1585 1586 return devm_gpiochip_add_data(dev, &st->gc, st);1587}1588 1589static int ad74115_setup_comp_gpio_chip(struct ad74115_state *st)1590{1591 struct device *dev = &st->spi->dev;1592 u32 val;1593 int ret;1594 1595 ret = regmap_read(st->regmap, AD74115_DIN_CONFIG1_REG, &val);1596 if (ret)1597 return ret;1598 1599 if (!(val & AD74115_DIN_COMPARATOR_EN_MASK))1600 return 0;1601 1602 st->comp_gc = (struct gpio_chip) {1603 .owner = THIS_MODULE,1604 .label = AD74115_NAME,1605 .base = -1,1606 .ngpio = 1,1607 .parent = dev,1608 .can_sleep = true,1609 .get_direction = ad74115_comp_gpio_get_direction,1610 .get = ad74115_comp_gpio_get,1611 .set_config = ad74115_comp_gpio_set_config,1612 };1613 1614 return devm_gpiochip_add_data(dev, &st->comp_gc, st);1615}1616 1617static int ad74115_setup(struct iio_dev *indio_dev)1618{1619 struct ad74115_state *st = iio_priv(indio_dev);1620 struct device *dev = &st->spi->dev;1621 u32 val, din_range_high;1622 unsigned int i;1623 int ret;1624 1625 ret = ad74115_apply_fw_prop(st, &ad74115_ch_func_fw_prop, &val);1626 if (ret)1627 return ret;1628 1629 indio_dev->num_channels += ad74115_channels_map[val].num_channels;1630 st->ch_func = val;1631 1632 ret = ad74115_setup_adc_conv2_range(st);1633 if (ret)1634 return ret;1635 1636 val = device_property_read_bool(dev, "adi,dac-hart-slew");1637 if (val) {1638 st->dac_hart_slew = val;1639 1640 ret = regmap_update_bits(st->regmap, AD74115_OUTPUT_CONFIG_REG,1641 AD74115_OUTPUT_SLEW_EN_MASK,1642 FIELD_PREP(AD74115_OUTPUT_SLEW_EN_MASK,1643 AD74115_SLEW_MODE_HART));1644 if (ret)1645 return ret;1646 }1647 1648 ret = ad74115_apply_fw_prop(st, &ad74115_din_range_fw_prop,1649 &din_range_high);1650 if (ret)1651 return ret;1652 1653 ret = device_property_read_u32(dev, "adi,digital-input-sink-microamp", &val);1654 if (!ret) {1655 if (din_range_high)1656 val = DIV_ROUND_CLOSEST(val, AD74115_DIN_SINK_LOW_STEP);1657 else1658 val = DIV_ROUND_CLOSEST(val, AD74115_DIN_SINK_HIGH_STEP);1659 1660 if (val > AD74115_DIN_SINK_MAX)1661 val = AD74115_DIN_SINK_MAX;1662 1663 ret = regmap_update_bits(st->regmap, AD74115_DIN_CONFIG1_REG,1664 AD74115_DIN_SINK_MASK,1665 FIELD_PREP(AD74115_DIN_SINK_MASK, val));1666 if (ret)1667 return ret;1668 }1669 1670 ret = ad74115_apply_fw_prop(st, &ad74115_din_threshold_mode_fw_prop, &val);1671 if (ret)1672 return ret;1673 1674 if (val == AD74115_DIN_THRESHOLD_MODE_AVDD && !st->avdd_mv)1675 return dev_err_probe(dev, -EINVAL,1676 "AVDD voltage is required for digital input threshold mode AVDD\n");1677 1678 st->din_threshold_mode = val;1679 1680 ret = ad74115_apply_fw_prop(st, &ad74115_dac_bipolar_fw_prop, &val);1681 if (ret)1682 return ret;1683 1684 st->dac_bipolar = val;1685 1686 ret = ad74115_apply_fw_prop(st, &ad74115_rtd_mode_fw_prop, &val);1687 if (ret)1688 return ret;1689 1690 st->rtd_mode_4_wire = val;1691 1692 ret = ad74115_apply_fw_prop(st, &ad74115_ext2_burnout_current_fw_prop, &val);1693 if (ret)1694 return ret;1695 1696 if (val) {1697 ret = regmap_update_bits(st->regmap, AD74115_BURNOUT_CONFIG_REG,1698 AD74115_BURNOUT_EXT2_EN_MASK,1699 FIELD_PREP(AD74115_BURNOUT_EXT2_EN_MASK, 1));1700 if (ret)1701 return ret;1702 }1703 1704 ret = ad74115_apply_fw_prop(st, &ad74115_ext1_burnout_current_fw_prop, &val);1705 if (ret)1706 return ret;1707 1708 if (val) {1709 ret = regmap_update_bits(st->regmap, AD74115_BURNOUT_CONFIG_REG,1710 AD74115_BURNOUT_EXT1_EN_MASK,1711 FIELD_PREP(AD74115_BURNOUT_EXT1_EN_MASK, 1));1712 if (ret)1713 return ret;1714 }1715 1716 ret = ad74115_apply_fw_prop(st, &ad74115_viout_burnout_current_fw_prop, &val);1717 if (ret)1718 return ret;1719 1720 if (val) {1721 ret = regmap_update_bits(st->regmap, AD74115_BURNOUT_CONFIG_REG,1722 AD74115_BURNOUT_VIOUT_EN_MASK,1723 FIELD_PREP(AD74115_BURNOUT_VIOUT_EN_MASK, 1));1724 if (ret)1725 return ret;1726 }1727 1728 for (i = 0; i < AD74115_GPIO_NUM; i++) {1729 ret = ad74115_apply_fw_prop(st, &ad74115_gpio_mode_fw_props[i], &val);1730 if (ret)1731 return ret;1732 1733 if (val == AD74115_GPIO_MODE_LOGIC)1734 st->gpio_valid_mask |= BIT(i);1735 }1736 1737 for (i = 0; i < ARRAY_SIZE(ad74115_fw_props); i++) {1738 ret = ad74115_apply_fw_prop(st, &ad74115_fw_props[i], &val);1739 if (ret)1740 return ret;1741 }1742 1743 ret = ad74115_setup_gpio_chip(st);1744 if (ret)1745 return ret;1746 1747 ret = ad74115_setup_comp_gpio_chip(st);1748 if (ret)1749 return ret;1750 1751 return ad74115_setup_iio_channels(indio_dev);1752}1753 1754static int ad74115_reset(struct ad74115_state *st)1755{1756 struct device *dev = &st->spi->dev;1757 struct gpio_desc *reset_gpio;1758 int ret;1759 1760 reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);1761 if (IS_ERR(reset_gpio))1762 return dev_err_probe(dev, PTR_ERR(reset_gpio),1763 "Failed to find reset GPIO\n");1764 1765 if (reset_gpio) {1766 fsleep(100);1767 1768 gpiod_set_value_cansleep(reset_gpio, 0);1769 } else {1770 ret = regmap_write(st->regmap, AD74115_CMD_KEY_REG,1771 AD74115_CMD_KEY_RESET1);1772 if (ret)1773 return ret;1774 1775 ret = regmap_write(st->regmap, AD74115_CMD_KEY_REG,1776 AD74115_CMD_KEY_RESET2);1777 if (ret)1778 return ret;1779 }1780 1781 fsleep(1000);1782 1783 return 0;1784}1785 1786static int ad74115_setup_trigger(struct iio_dev *indio_dev)1787{1788 struct ad74115_state *st = iio_priv(indio_dev);1789 struct device *dev = &st->spi->dev;1790 int ret;1791 1792 st->irq = fwnode_irq_get_byname(dev_fwnode(dev), "adc_rdy");1793 1794 if (st->irq == -EPROBE_DEFER)1795 return -EPROBE_DEFER;1796 1797 if (st->irq < 0) {1798 st->irq = 0;1799 return 0;1800 }1801 1802 ret = devm_request_irq(dev, st->irq, ad74115_adc_data_interrupt,1803 0, AD74115_NAME, indio_dev);1804 if (ret)1805 return ret;1806 1807 st->trig = devm_iio_trigger_alloc(dev, "%s-dev%d", AD74115_NAME,1808 iio_device_id(indio_dev));1809 if (!st->trig)1810 return -ENOMEM;1811 1812 st->trig->ops = &ad74115_trigger_ops;1813 iio_trigger_set_drvdata(st->trig, st);1814 1815 ret = devm_iio_trigger_register(dev, st->trig);1816 if (ret)1817 return ret;1818 1819 indio_dev->trig = iio_trigger_get(st->trig);1820 1821 return 0;1822}1823 1824static int ad74115_probe(struct spi_device *spi)1825{1826 static const char * const regulator_names[] = {1827 "avcc", "dvcc", "dovdd", "refin",1828 };1829 struct device *dev = &spi->dev;1830 struct ad74115_state *st;1831 struct iio_dev *indio_dev;1832 int ret;1833 1834 indio_dev = devm_iio_device_alloc(dev, sizeof(*st));1835 if (!indio_dev)1836 return -ENOMEM;1837 1838 st = iio_priv(indio_dev);1839 1840 st->spi = spi;1841 mutex_init(&st->lock);1842 init_completion(&st->adc_data_completion);1843 1844 indio_dev->name = AD74115_NAME;1845 indio_dev->modes = INDIO_DIRECT_MODE;1846 indio_dev->info = &ad74115_info;1847 1848 ret = devm_regulator_get_enable_read_voltage(dev, "avdd");1849 if (ret < 0) {1850 /*1851 * Since this is both a power supply and only optionally a1852 * reference voltage, make sure to enable it even when the1853 * voltage is not available.1854 */1855 ret = devm_regulator_get_enable(dev, "avdd");1856 if (ret)1857 return dev_err_probe(dev, ret, "failed to enable avdd\n");1858 } else {1859 st->avdd_mv = ret / 1000;1860 }1861 1862 ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(regulator_names),1863 regulator_names);1864 if (ret)1865 return ret;1866 1867 st->regmap = devm_regmap_init(dev, NULL, st, &ad74115_regmap_config);1868 if (IS_ERR(st->regmap))1869 return PTR_ERR(st->regmap);1870 1871 ret = ad74115_reset(st);1872 if (ret)1873 return ret;1874 1875 ret = ad74115_setup(indio_dev);1876 if (ret)1877 return ret;1878 1879 ret = ad74115_setup_trigger(indio_dev);1880 if (ret)1881 return ret;1882 1883 ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,1884 ad74115_trigger_handler,1885 &ad74115_buffer_ops);1886 if (ret)1887 return ret;1888 1889 return devm_iio_device_register(dev, indio_dev);1890}1891 1892static int ad74115_unregister_driver(struct spi_driver *spi)1893{1894 spi_unregister_driver(spi);1895 1896 return 0;1897}1898 1899static int __init ad74115_register_driver(struct spi_driver *spi)1900{1901 crc8_populate_msb(ad74115_crc8_table, AD74115_CRC_POLYNOMIAL);1902 1903 return spi_register_driver(spi);1904}1905 1906static const struct spi_device_id ad74115_spi_id[] = {1907 { "ad74115h" },1908 { }1909};1910 1911MODULE_DEVICE_TABLE(spi, ad74115_spi_id);1912 1913static const struct of_device_id ad74115_dt_id[] = {1914 { .compatible = "adi,ad74115h" },1915 { }1916};1917MODULE_DEVICE_TABLE(of, ad74115_dt_id);1918 1919static struct spi_driver ad74115_driver = {1920 .driver = {1921 .name = "ad74115",1922 .of_match_table = ad74115_dt_id,1923 },1924 .probe = ad74115_probe,1925 .id_table = ad74115_spi_id,1926};1927 1928module_driver(ad74115_driver,1929 ad74115_register_driver, ad74115_unregister_driver);1930 1931MODULE_AUTHOR("Cosmin Tanislav <cosmin.tanislav@analog.com>");1932MODULE_DESCRIPTION("Analog Devices AD74115 ADDAC");1933MODULE_LICENSE("GPL");1934