1// SPDX-License-Identifier: GPL-2.0+ 2/* 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/clk.h> 10#include <linux/clk-provider.h> 11#include <linux/delay.h> 12#include <linux/device.h> 13#include <linux/err.h> 14#include <linux/gpio/driver.h> 15#include <linux/interrupt.h> 16#include <linux/irq.h> 17#include <linux/kernel.h> 18#include <linux/module.h> 19#include <linux/property.h> 20#include <linux/regmap.h> 21#include <linux/regulator/consumer.h> 22#include <linux/spi/spi.h> 23#include <linux/units.h> 24 25#include <asm/div64.h> 26#include <asm/unaligned.h> 27 28#include <linux/iio/buffer.h> 29#include <linux/iio/iio.h> 30#include <linux/iio/kfifo_buf.h> 31#include <linux/iio/sysfs.h> 32 33#define AD4130_NAME "ad4130" 34 35#define AD4130_COMMS_READ_MASK BIT(6) 36 37#define AD4130_STATUS_REG 0x00 38 39#define AD4130_ADC_CONTROL_REG 0x01 40#define AD4130_ADC_CONTROL_BIPOLAR_MASK BIT(14) 41#define AD4130_ADC_CONTROL_INT_REF_VAL_MASK BIT(13) 42#define AD4130_INT_REF_2_5V 2500000 43#define AD4130_INT_REF_1_25V 1250000 44#define AD4130_ADC_CONTROL_CSB_EN_MASK BIT(9) 45#define AD4130_ADC_CONTROL_INT_REF_EN_MASK BIT(8) 46#define AD4130_ADC_CONTROL_MODE_MASK GENMASK(5, 2) 47#define AD4130_ADC_CONTROL_MCLK_SEL_MASK GENMASK(1, 0) 48#define AD4130_MCLK_FREQ_76_8KHZ 76800 49#define AD4130_MCLK_FREQ_153_6KHZ 153600 50 51#define AD4130_DATA_REG 0x02 52 53#define AD4130_IO_CONTROL_REG 0x03 54#define AD4130_IO_CONTROL_INT_PIN_SEL_MASK GENMASK(9, 8) 55#define AD4130_IO_CONTROL_GPIO_DATA_MASK GENMASK(7, 4) 56#define AD4130_IO_CONTROL_GPIO_CTRL_MASK GENMASK(3, 0) 57 58#define AD4130_VBIAS_REG 0x04 59 60#define AD4130_ID_REG 0x05 61 62#define AD4130_ERROR_REG 0x06 63 64#define AD4130_ERROR_EN_REG 0x07 65 66#define AD4130_MCLK_COUNT_REG 0x08 67 68#define AD4130_CHANNEL_X_REG(x) (0x09 + (x)) 69#define AD4130_CHANNEL_EN_MASK BIT(23) 70#define AD4130_CHANNEL_SETUP_MASK GENMASK(22, 20) 71#define AD4130_CHANNEL_AINP_MASK GENMASK(17, 13) 72#define AD4130_CHANNEL_AINM_MASK GENMASK(12, 8) 73#define AD4130_CHANNEL_IOUT1_MASK GENMASK(7, 4) 74#define AD4130_CHANNEL_IOUT2_MASK GENMASK(3, 0) 75 76#define AD4130_CONFIG_X_REG(x) (0x19 + (x)) 77#define AD4130_CONFIG_IOUT1_VAL_MASK GENMASK(15, 13) 78#define AD4130_CONFIG_IOUT2_VAL_MASK GENMASK(12, 10) 79#define AD4130_CONFIG_BURNOUT_MASK GENMASK(9, 8) 80#define AD4130_CONFIG_REF_BUFP_MASK BIT(7) 81#define AD4130_CONFIG_REF_BUFM_MASK BIT(6) 82#define AD4130_CONFIG_REF_SEL_MASK GENMASK(5, 4) 83#define AD4130_CONFIG_PGA_MASK GENMASK(3, 1) 84 85#define AD4130_FILTER_X_REG(x) (0x21 + (x)) 86#define AD4130_FILTER_MODE_MASK GENMASK(15, 12) 87#define AD4130_FILTER_SELECT_MASK GENMASK(10, 0) 88#define AD4130_FILTER_SELECT_MIN 1 89 90#define AD4130_OFFSET_X_REG(x) (0x29 + (x)) 91 92#define AD4130_GAIN_X_REG(x) (0x31 + (x)) 93 94#define AD4130_MISC_REG 0x39 95 96#define AD4130_FIFO_CONTROL_REG 0x3a 97#define AD4130_FIFO_CONTROL_HEADER_MASK BIT(18) 98#define AD4130_FIFO_CONTROL_MODE_MASK GENMASK(17, 16) 99#define AD4130_FIFO_CONTROL_WM_INT_EN_MASK BIT(9) 100#define AD4130_FIFO_CONTROL_WM_MASK GENMASK(7, 0) 101#define AD4130_WATERMARK_256 0 102 103#define AD4130_FIFO_STATUS_REG 0x3b 104 105#define AD4130_FIFO_THRESHOLD_REG 0x3c 106 107#define AD4130_FIFO_DATA_REG 0x3d 108#define AD4130_FIFO_SIZE 256 109#define AD4130_FIFO_MAX_SAMPLE_SIZE 3 110 111#define AD4130_MAX_ANALOG_PINS 16 112#define AD4130_MAX_CHANNELS 16 113#define AD4130_MAX_DIFF_INPUTS 30 114#define AD4130_MAX_GPIOS 4 115#define AD4130_MAX_ODR 2400 116#define AD4130_MAX_PGA 8 117#define AD4130_MAX_SETUPS 8 118 119#define AD4130_AIN2_P1 0x2 120#define AD4130_AIN3_P2 0x3 121 122#define AD4130_RESET_BUF_SIZE 8 123#define AD4130_RESET_SLEEP_US (160 * MICRO / AD4130_MCLK_FREQ_76_8KHZ) 124 125#define AD4130_INVALID_SLOT -1 126 127static const unsigned int ad4130_reg_size[] = { 128 [AD4130_STATUS_REG] = 1, 129 [AD4130_ADC_CONTROL_REG] = 2, 130 [AD4130_DATA_REG] = 3, 131 [AD4130_IO_CONTROL_REG] = 2, 132 [AD4130_VBIAS_REG] = 2, 133 [AD4130_ID_REG] = 1, 134 [AD4130_ERROR_REG] = 2, 135 [AD4130_ERROR_EN_REG] = 2, 136 [AD4130_MCLK_COUNT_REG] = 1, 137 [AD4130_CHANNEL_X_REG(0) ... AD4130_CHANNEL_X_REG(AD4130_MAX_CHANNELS - 1)] = 3, 138 [AD4130_CONFIG_X_REG(0) ... AD4130_CONFIG_X_REG(AD4130_MAX_SETUPS - 1)] = 2, 139 [AD4130_FILTER_X_REG(0) ... AD4130_FILTER_X_REG(AD4130_MAX_SETUPS - 1)] = 3, 140 [AD4130_OFFSET_X_REG(0) ... AD4130_OFFSET_X_REG(AD4130_MAX_SETUPS - 1)] = 3, 141 [AD4130_GAIN_X_REG(0) ... AD4130_GAIN_X_REG(AD4130_MAX_SETUPS - 1)] = 3, 142 [AD4130_MISC_REG] = 2, 143 [AD4130_FIFO_CONTROL_REG] = 3, 144 [AD4130_FIFO_STATUS_REG] = 1, 145 [AD4130_FIFO_THRESHOLD_REG] = 3, 146 [AD4130_FIFO_DATA_REG] = 3, 147}; 148 149enum ad4130_int_ref_val { 150 AD4130_INT_REF_VAL_2_5V, 151 AD4130_INT_REF_VAL_1_25V, 152}; 153 154enum ad4130_mclk_sel { 155 AD4130_MCLK_76_8KHZ, 156 AD4130_MCLK_76_8KHZ_OUT, 157 AD4130_MCLK_76_8KHZ_EXT, 158 AD4130_MCLK_153_6KHZ_EXT, 159}; 160 161enum ad4130_int_pin_sel { 162 AD4130_INT_PIN_INT, 163 AD4130_INT_PIN_CLK, 164 AD4130_INT_PIN_P2, 165 AD4130_INT_PIN_DOUT, 166}; 167 168enum ad4130_iout { 169 AD4130_IOUT_OFF, 170 AD4130_IOUT_10000NA, 171 AD4130_IOUT_20000NA, 172 AD4130_IOUT_50000NA, 173 AD4130_IOUT_100000NA, 174 AD4130_IOUT_150000NA, 175 AD4130_IOUT_200000NA, 176 AD4130_IOUT_100NA, 177 AD4130_IOUT_MAX 178}; 179 180enum ad4130_burnout { 181 AD4130_BURNOUT_OFF, 182 AD4130_BURNOUT_500NA, 183 AD4130_BURNOUT_2000NA, 184 AD4130_BURNOUT_4000NA, 185 AD4130_BURNOUT_MAX 186}; 187 188enum ad4130_ref_sel { 189 AD4130_REF_REFIN1, 190 AD4130_REF_REFIN2, 191 AD4130_REF_REFOUT_AVSS, 192 AD4130_REF_AVDD_AVSS, 193 AD4130_REF_SEL_MAX 194}; 195 196enum ad4130_fifo_mode { 197 AD4130_FIFO_MODE_DISABLED = 0b00, 198 AD4130_FIFO_MODE_WM = 0b01, 199}; 200 201enum ad4130_mode { 202 AD4130_MODE_CONTINUOUS = 0b0000, 203 AD4130_MODE_IDLE = 0b0100, 204}; 205 206enum ad4130_filter_mode { 207 AD4130_FILTER_SINC4, 208 AD4130_FILTER_SINC4_SINC1, 209 AD4130_FILTER_SINC3, 210 AD4130_FILTER_SINC3_REJ60, 211 AD4130_FILTER_SINC3_SINC1, 212 AD4130_FILTER_SINC3_PF1, 213 AD4130_FILTER_SINC3_PF2, 214 AD4130_FILTER_SINC3_PF3, 215 AD4130_FILTER_SINC3_PF4, 216}; 217 218enum ad4130_pin_function { 219 AD4130_PIN_FN_NONE, 220 AD4130_PIN_FN_SPECIAL = BIT(0), 221 AD4130_PIN_FN_DIFF = BIT(1), 222 AD4130_PIN_FN_EXCITATION = BIT(2), 223 AD4130_PIN_FN_VBIAS = BIT(3), 224}; 225 226struct ad4130_setup_info { 227 unsigned int iout0_val; 228 unsigned int iout1_val; 229 unsigned int burnout; 230 unsigned int pga; 231 unsigned int fs; 232 u32 ref_sel; 233 enum ad4130_filter_mode filter_mode; 234 bool ref_bufp; 235 bool ref_bufm; 236}; 237 238struct ad4130_slot_info { 239 struct ad4130_setup_info setup; 240 unsigned int enabled_channels; 241 unsigned int channels; 242}; 243 244struct ad4130_chan_info { 245 struct ad4130_setup_info setup; 246 u32 iout0; 247 u32 iout1; 248 int slot; 249 bool enabled; 250 bool initialized; 251}; 252 253struct ad4130_filter_config { 254 enum ad4130_filter_mode filter_mode; 255 unsigned int odr_div; 256 unsigned int fs_max; 257 enum iio_available_type samp_freq_avail_type; 258 int samp_freq_avail_len; 259 int samp_freq_avail[3][2]; 260}; 261 262struct ad4130_state { 263 struct regmap *regmap; 264 struct spi_device *spi; 265 struct clk *mclk; 266 struct regulator_bulk_data regulators[4]; 267 u32 irq_trigger; 268 u32 inv_irq_trigger; 269 270 /* 271 * Synchronize access to members the of driver state, and ensure 272 * atomicity of consecutive regmap operations. 273 */ 274 struct mutex lock; 275 struct completion completion; 276 277 struct iio_chan_spec chans[AD4130_MAX_CHANNELS]; 278 struct ad4130_chan_info chans_info[AD4130_MAX_CHANNELS]; 279 struct ad4130_slot_info slots_info[AD4130_MAX_SETUPS]; 280 enum ad4130_pin_function pins_fn[AD4130_MAX_ANALOG_PINS]; 281 u32 vbias_pins[AD4130_MAX_ANALOG_PINS]; 282 u32 num_vbias_pins; 283 int scale_tbls[AD4130_REF_SEL_MAX][AD4130_MAX_PGA][2]; 284 struct gpio_chip gc; 285 struct clk_hw int_clk_hw; 286 287 u32 int_pin_sel; 288 u32 int_ref_uv; 289 u32 mclk_sel; 290 bool int_ref_en; 291 bool bipolar; 292 293 unsigned int num_enabled_channels; 294 unsigned int effective_watermark; 295 unsigned int watermark; 296 297 struct spi_message fifo_msg; 298 struct spi_transfer fifo_xfer[2]; 299 300 /* 301 * DMA (thus cache coherency maintenance) requires any transfer 302 * buffers to live in their own cache lines. As the use of these 303 * buffers is synchronous, all of the buffers used for DMA in this 304 * driver may share a cache line. 305 */ 306 u8 reset_buf[AD4130_RESET_BUF_SIZE] __aligned(IIO_DMA_MINALIGN); 307 u8 reg_write_tx_buf[4]; 308 u8 reg_read_tx_buf[1]; 309 u8 reg_read_rx_buf[3]; 310 u8 fifo_tx_buf[2]; 311 u8 fifo_rx_buf[AD4130_FIFO_SIZE * 312 AD4130_FIFO_MAX_SAMPLE_SIZE]; 313}; 314 315static const char * const ad4130_int_pin_names[] = { 316 [AD4130_INT_PIN_INT] = "int", 317 [AD4130_INT_PIN_CLK] = "clk", 318 [AD4130_INT_PIN_P2] = "p2", 319 [AD4130_INT_PIN_DOUT] = "dout", 320}; 321 322static const unsigned int ad4130_iout_current_na_tbl[AD4130_IOUT_MAX] = { 323 [AD4130_IOUT_OFF] = 0, 324 [AD4130_IOUT_100NA] = 100, 325 [AD4130_IOUT_10000NA] = 10000, 326 [AD4130_IOUT_20000NA] = 20000, 327 [AD4130_IOUT_50000NA] = 50000, 328 [AD4130_IOUT_100000NA] = 100000, 329 [AD4130_IOUT_150000NA] = 150000, 330 [AD4130_IOUT_200000NA] = 200000, 331}; 332 333static const unsigned int ad4130_burnout_current_na_tbl[AD4130_BURNOUT_MAX] = { 334 [AD4130_BURNOUT_OFF] = 0, 335 [AD4130_BURNOUT_500NA] = 500, 336 [AD4130_BURNOUT_2000NA] = 2000, 337 [AD4130_BURNOUT_4000NA] = 4000, 338}; 339 340#define AD4130_VARIABLE_ODR_CONFIG(_filter_mode, _odr_div, _fs_max) \ 341{ \ 342 .filter_mode = (_filter_mode), \ 343 .odr_div = (_odr_div), \ 344 .fs_max = (_fs_max), \ 345 .samp_freq_avail_type = IIO_AVAIL_RANGE, \ 346 .samp_freq_avail = { \ 347 { AD4130_MAX_ODR, (_odr_div) * (_fs_max) }, \ 348 { AD4130_MAX_ODR, (_odr_div) * (_fs_max) }, \ 349 { AD4130_MAX_ODR, (_odr_div) }, \ 350 }, \ 351} 352 353#define AD4130_FIXED_ODR_CONFIG(_filter_mode, _odr_div) \ 354{ \ 355 .filter_mode = (_filter_mode), \ 356 .odr_div = (_odr_div), \ 357 .fs_max = AD4130_FILTER_SELECT_MIN, \ 358 .samp_freq_avail_type = IIO_AVAIL_LIST, \ 359 .samp_freq_avail_len = 1, \ 360 .samp_freq_avail = { \ 361 { AD4130_MAX_ODR, (_odr_div) }, \ 362 }, \ 363} 364 365static const struct ad4130_filter_config ad4130_filter_configs[] = { 366 AD4130_VARIABLE_ODR_CONFIG(AD4130_FILTER_SINC4, 1, 10), 367 AD4130_VARIABLE_ODR_CONFIG(AD4130_FILTER_SINC4_SINC1, 11, 10), 368 AD4130_VARIABLE_ODR_CONFIG(AD4130_FILTER_SINC3, 1, 2047), 369 AD4130_VARIABLE_ODR_CONFIG(AD4130_FILTER_SINC3_REJ60, 1, 2047), 370 AD4130_VARIABLE_ODR_CONFIG(AD4130_FILTER_SINC3_SINC1, 10, 2047), 371 AD4130_FIXED_ODR_CONFIG(AD4130_FILTER_SINC3_PF1, 92), 372 AD4130_FIXED_ODR_CONFIG(AD4130_FILTER_SINC3_PF2, 100), 373 AD4130_FIXED_ODR_CONFIG(AD4130_FILTER_SINC3_PF3, 124), 374 AD4130_FIXED_ODR_CONFIG(AD4130_FILTER_SINC3_PF4, 148), 375}; 376 377static const char * const ad4130_filter_modes_str[] = { 378 [AD4130_FILTER_SINC4] = "sinc4", 379 [AD4130_FILTER_SINC4_SINC1] = "sinc4+sinc1", 380 [AD4130_FILTER_SINC3] = "sinc3", 381 [AD4130_FILTER_SINC3_REJ60] = "sinc3+rej60", 382 [AD4130_FILTER_SINC3_SINC1] = "sinc3+sinc1", 383 [AD4130_FILTER_SINC3_PF1] = "sinc3+pf1", 384 [AD4130_FILTER_SINC3_PF2] = "sinc3+pf2", 385 [AD4130_FILTER_SINC3_PF3] = "sinc3+pf3", 386 [AD4130_FILTER_SINC3_PF4] = "sinc3+pf4", 387}; 388 389static int ad4130_get_reg_size(struct ad4130_state *st, unsigned int reg, 390 unsigned int *size) 391{ 392 if (reg >= ARRAY_SIZE(ad4130_reg_size)) 393 return -EINVAL; 394 395 *size = ad4130_reg_size[reg]; 396 397 return 0; 398} 399 400static unsigned int ad4130_data_reg_size(struct ad4130_state *st) 401{ 402 unsigned int data_reg_size; 403 int ret; 404 405 ret = ad4130_get_reg_size(st, AD4130_DATA_REG, &data_reg_size); 406 if (ret) 407 return 0; 408 409 return data_reg_size; 410} 411 412static unsigned int ad4130_resolution(struct ad4130_state *st) 413{ 414 return ad4130_data_reg_size(st) * BITS_PER_BYTE; 415} 416 417static int ad4130_reg_write(void *context, unsigned int reg, unsigned int val) 418{ 419 struct ad4130_state *st = context; 420 unsigned int size; 421 int ret; 422 423 ret = ad4130_get_reg_size(st, reg, &size); 424 if (ret) 425 return ret; 426 427 st->reg_write_tx_buf[0] = reg; 428 429 switch (size) { 430 case 3: 431 put_unaligned_be24(val, &st->reg_write_tx_buf[1]); 432 break; 433 case 2: 434 put_unaligned_be16(val, &st->reg_write_tx_buf[1]); 435 break; 436 case 1: 437 st->reg_write_tx_buf[1] = val; 438 break; 439 default: 440 return -EINVAL; 441 } 442 443 return spi_write(st->spi, st->reg_write_tx_buf, size + 1); 444} 445 446static int ad4130_reg_read(void *context, unsigned int reg, unsigned int *val) 447{ 448 struct ad4130_state *st = context; 449 struct spi_transfer t[] = { 450 { 451 .tx_buf = st->reg_read_tx_buf, 452 .len = sizeof(st->reg_read_tx_buf), 453 }, 454 { 455 .rx_buf = st->reg_read_rx_buf, 456 }, 457 }; 458 unsigned int size; 459 int ret; 460 461 ret = ad4130_get_reg_size(st, reg, &size); 462 if (ret) 463 return ret; 464 465 st->reg_read_tx_buf[0] = AD4130_COMMS_READ_MASK | reg; 466 t[1].len = size; 467 468 ret = spi_sync_transfer(st->spi, t, ARRAY_SIZE(t)); 469 if (ret) 470 return ret; 471 472 switch (size) { 473 case 3: 474 *val = get_unaligned_be24(st->reg_read_rx_buf); 475 break; 476 case 2: 477 *val = get_unaligned_be16(st->reg_read_rx_buf); 478 break; 479 case 1: 480 *val = st->reg_read_rx_buf[0]; 481 break; 482 default: 483 return -EINVAL; 484 } 485 486 return 0; 487} 488 489static const struct regmap_config ad4130_regmap_config = { 490 .reg_read = ad4130_reg_read, 491 .reg_write = ad4130_reg_write, 492}; 493 494static int ad4130_gpio_init_valid_mask(struct gpio_chip *gc, 495 unsigned long *valid_mask, 496 unsigned int ngpios) 497{ 498 struct ad4130_state *st = gpiochip_get_data(gc); 499 unsigned int i; 500 501 /* 502 * Output-only GPIO functionality is available on pins AIN2 through 503 * AIN5. If these pins are used for anything else, do not expose them. 504 */ 505 for (i = 0; i < ngpios; i++) { 506 unsigned int pin = i + AD4130_AIN2_P1; 507 bool valid = st->pins_fn[pin] == AD4130_PIN_FN_NONE; 508 509 __assign_bit(i, valid_mask, valid); 510 } 511 512 return 0; 513} 514 515static int ad4130_gpio_get_direction(struct gpio_chip *gc, unsigned int offset) 516{ 517 return GPIO_LINE_DIRECTION_OUT; 518} 519 520static void ad4130_gpio_set(struct gpio_chip *gc, unsigned int offset, 521 int value) 522{ 523 struct ad4130_state *st = gpiochip_get_data(gc); 524 unsigned int mask = FIELD_PREP(AD4130_IO_CONTROL_GPIO_DATA_MASK, 525 BIT(offset)); 526 527 regmap_update_bits(st->regmap, AD4130_IO_CONTROL_REG, mask, 528 value ? mask : 0); 529} 530 531static int ad4130_set_mode(struct ad4130_state *st, enum ad4130_mode mode) 532{ 533 return regmap_update_bits(st->regmap, AD4130_ADC_CONTROL_REG, 534 AD4130_ADC_CONTROL_MODE_MASK, 535 FIELD_PREP(AD4130_ADC_CONTROL_MODE_MASK, mode)); 536} 537 538static int ad4130_set_watermark_interrupt_en(struct ad4130_state *st, bool en) 539{ 540 return regmap_update_bits(st->regmap, AD4130_FIFO_CONTROL_REG, 541 AD4130_FIFO_CONTROL_WM_INT_EN_MASK, 542 FIELD_PREP(AD4130_FIFO_CONTROL_WM_INT_EN_MASK, en)); 543} 544 545static unsigned int ad4130_watermark_reg_val(unsigned int val) 546{ 547 if (val == AD4130_FIFO_SIZE) 548 val = AD4130_WATERMARK_256; 549 550 return val; 551} 552 553static int ad4130_set_fifo_mode(struct ad4130_state *st, 554 enum ad4130_fifo_mode mode) 555{ 556 return regmap_update_bits(st->regmap, AD4130_FIFO_CONTROL_REG, 557 AD4130_FIFO_CONTROL_MODE_MASK, 558 FIELD_PREP(AD4130_FIFO_CONTROL_MODE_MASK, mode)); 559} 560 561static void ad4130_push_fifo_data(struct iio_dev *indio_dev) 562{ 563 struct ad4130_state *st = iio_priv(indio_dev); 564 unsigned int data_reg_size = ad4130_data_reg_size(st); 565 unsigned int transfer_len = st->effective_watermark * data_reg_size; 566 unsigned int set_size = st->num_enabled_channels * data_reg_size; 567 unsigned int i; 568 int ret; 569 570 st->fifo_tx_buf[1] = ad4130_watermark_reg_val(st->effective_watermark); 571 st->fifo_xfer[1].len = transfer_len; 572 573 ret = spi_sync(st->spi, &st->fifo_msg); 574 if (ret) 575 return; 576 577 for (i = 0; i < transfer_len; i += set_size) 578 iio_push_to_buffers(indio_dev, &st->fifo_rx_buf[i]); 579} 580 581static irqreturn_t ad4130_irq_handler(int irq, void *private) 582{ 583 struct iio_dev *indio_dev = private; 584 struct ad4130_state *st = iio_priv(indio_dev); 585 586 if (iio_buffer_enabled(indio_dev)) 587 ad4130_push_fifo_data(indio_dev); 588 else 589 complete(&st->completion); 590 591 return IRQ_HANDLED; 592} 593 594static int ad4130_find_slot(struct ad4130_state *st, 595 struct ad4130_setup_info *target_setup_info, 596 unsigned int *slot, bool *overwrite) 597{ 598 unsigned int i; 599 600 *slot = AD4130_INVALID_SLOT; 601 *overwrite = false; 602 603 for (i = 0; i < AD4130_MAX_SETUPS; i++) { 604 struct ad4130_slot_info *slot_info = &st->slots_info[i]; 605 606 /* Immediately accept a matching setup info. */ 607 if (!memcmp(target_setup_info, &slot_info->setup, 608 sizeof(*target_setup_info))) { 609 *slot = i; 610 return 0; 611 } 612 613 /* Ignore all setups which are used by enabled channels. */ 614 if (slot_info->enabled_channels) 615 continue; 616 617 /* Find the least used slot. */ 618 if (*slot == AD4130_INVALID_SLOT || 619 slot_info->channels < st->slots_info[*slot].channels) 620 *slot = i; 621 } 622 623 if (*slot == AD4130_INVALID_SLOT) 624 return -EINVAL; 625 626 *overwrite = true; 627 628 return 0; 629} 630 631static void ad4130_unlink_channel(struct ad4130_state *st, unsigned int channel) 632{ 633 struct ad4130_chan_info *chan_info = &st->chans_info[channel]; 634 struct ad4130_slot_info *slot_info = &st->slots_info[chan_info->slot]; 635 636 chan_info->slot = AD4130_INVALID_SLOT; 637 slot_info->channels--; 638} 639 640static int ad4130_unlink_slot(struct ad4130_state *st, unsigned int slot) 641{ 642 unsigned int i; 643 644 for (i = 0; i < AD4130_MAX_CHANNELS; i++) { 645 struct ad4130_chan_info *chan_info = &st->chans_info[i]; 646 647 if (!chan_info->initialized || chan_info->slot != slot) 648 continue; 649 650 ad4130_unlink_channel(st, i); 651 } 652 653 return 0; 654} 655 656static int ad4130_link_channel_slot(struct ad4130_state *st, 657 unsigned int channel, unsigned int slot) 658{ 659 struct ad4130_slot_info *slot_info = &st->slots_info[slot]; 660 struct ad4130_chan_info *chan_info = &st->chans_info[channel]; 661 int ret; 662 663 ret = regmap_update_bits(st->regmap, AD4130_CHANNEL_X_REG(channel), 664 AD4130_CHANNEL_SETUP_MASK, 665 FIELD_PREP(AD4130_CHANNEL_SETUP_MASK, slot)); 666 if (ret) 667 return ret; 668 669 chan_info->slot = slot; 670 slot_info->channels++; 671 672 return 0; 673} 674 675static int ad4130_write_slot_setup(struct ad4130_state *st, 676 unsigned int slot, 677 struct ad4130_setup_info *setup_info) 678{ 679 unsigned int val; 680 int ret; 681 682 val = FIELD_PREP(AD4130_CONFIG_IOUT1_VAL_MASK, setup_info->iout0_val) | 683 FIELD_PREP(AD4130_CONFIG_IOUT1_VAL_MASK, setup_info->iout1_val) | 684 FIELD_PREP(AD4130_CONFIG_BURNOUT_MASK, setup_info->burnout) | 685 FIELD_PREP(AD4130_CONFIG_REF_BUFP_MASK, setup_info->ref_bufp) | 686 FIELD_PREP(AD4130_CONFIG_REF_BUFM_MASK, setup_info->ref_bufm) | 687 FIELD_PREP(AD4130_CONFIG_REF_SEL_MASK, setup_info->ref_sel) | 688 FIELD_PREP(AD4130_CONFIG_PGA_MASK, setup_info->pga); 689 690 ret = regmap_write(st->regmap, AD4130_CONFIG_X_REG(slot), val); 691 if (ret) 692 return ret; 693 694 val = FIELD_PREP(AD4130_FILTER_MODE_MASK, setup_info->filter_mode) | 695 FIELD_PREP(AD4130_FILTER_SELECT_MASK, setup_info->fs); 696 697 ret = regmap_write(st->regmap, AD4130_FILTER_X_REG(slot), val); 698 if (ret) 699 return ret; 700 701 memcpy(&st->slots_info[slot].setup, setup_info, sizeof(*setup_info)); 702 703 return 0; 704} 705 706static int ad4130_write_channel_setup(struct ad4130_state *st, 707 unsigned int channel, bool on_enable) 708{ 709 struct ad4130_chan_info *chan_info = &st->chans_info[channel]; 710 struct ad4130_setup_info *setup_info = &chan_info->setup; 711 bool overwrite; 712 int slot; 713 int ret; 714 715 /* 716 * The following cases need to be handled. 717 * 718 * 1. Enabled and linked channel with setup changes: 719 * - Find a slot. If not possible, return error. 720 * - Unlink channel from current slot. 721 * - If the slot has channels linked to it, unlink all channels, and 722 * write the new setup to it. 723 * - Link channel to new slot. 724 * 725 * 2. Soon to be enabled and unlinked channel: 726 * - Find a slot. If not possible, return error. 727 * - If the slot has channels linked to it, unlink all channels, and 728 * write the new setup to it. 729 * - Link channel to the slot. 730 * 731 * 3. Disabled and linked channel with setup changes: 732 * - Unlink channel from current slot. 733 * 734 * 4. Soon to be enabled and linked channel: 735 * 5. Disabled and unlinked channel with setup changes: 736 * - Do nothing. 737 */ 738 739 /* Case 4 */ 740 if (on_enable && chan_info->slot != AD4130_INVALID_SLOT) 741 return 0; 742 743 if (!on_enable && !chan_info->enabled) { 744 if (chan_info->slot != AD4130_INVALID_SLOT) 745 /* Case 3 */ 746 ad4130_unlink_channel(st, channel); 747 748 /* Cases 3 & 5 */ 749 return 0; 750 } 751 752 /* Cases 1 & 2 */ 753 ret = ad4130_find_slot(st, setup_info, &slot, &overwrite); 754 if (ret) 755 return ret; 756 757 if (chan_info->slot != AD4130_INVALID_SLOT) 758 /* Case 1 */ 759 ad4130_unlink_channel(st, channel); 760 761 if (overwrite) { 762 ret = ad4130_unlink_slot(st, slot); 763 if (ret) 764 return ret; 765 766 ret = ad4130_write_slot_setup(st, slot, setup_info); 767 if (ret) 768 return ret; 769 } 770 771 return ad4130_link_channel_slot(st, channel, slot); 772} 773 774static int ad4130_set_channel_enable(struct ad4130_state *st, 775 unsigned int channel, bool status) 776{ 777 struct ad4130_chan_info *chan_info = &st->chans_info[channel]; 778 struct ad4130_slot_info *slot_info; 779 int ret; 780 781 if (chan_info->enabled == status) 782 return 0; 783 784 if (status) { 785 ret = ad4130_write_channel_setup(st, channel, true); 786 if (ret) 787 return ret; 788 } 789 790 slot_info = &st->slots_info[chan_info->slot]; 791 792 ret = regmap_update_bits(st->regmap, AD4130_CHANNEL_X_REG(channel), 793 AD4130_CHANNEL_EN_MASK, 794 FIELD_PREP(AD4130_CHANNEL_EN_MASK, status)); 795 if (ret) 796 return ret; 797 798 slot_info->enabled_channels += status ? 1 : -1; 799 chan_info->enabled = status; 800 801 return 0; 802} 803 804/* 805 * Table 58. FILTER_MODE_n bits and Filter Types of the datasheet describes 806 * the relation between filter mode, ODR and FS. 807 * 808 * Notice that the max ODR of each filter mode is not necessarily the 809 * absolute max ODR supported by the chip. 810 * 811 * The ODR divider is not explicitly specified, but it can be deduced based 812 * on the ODR range of each filter mode. 813 * 814 * For example, for Sinc4+Sinc1, max ODR is 218.18. That means that the 815 * absolute max ODR is divided by 11 to achieve the max ODR of this filter 816 * mode. 817 * 818 * The formulas for converting between ODR and FS for a specific filter 819 * mode can be deduced from the same table. 820 * 821 * Notice that FS = 1 actually means max ODR, and that ODR decreases by 822 * (maximum ODR / maximum FS) for each increment of FS. 823 * 824 * odr = MAX_ODR / odr_div * (1 - (fs - 1) / fs_max) <=> 825 * odr = MAX_ODR * (1 - (fs - 1) / fs_max) / odr_div <=> 826 * odr = MAX_ODR * (1 - (fs - 1) / fs_max) / odr_div <=> 827 * odr = MAX_ODR * (fs_max - fs + 1) / (fs_max * odr_div) 828 * (used in ad4130_fs_to_freq) 829 * 830 * For the opposite formula, FS can be extracted from the last one. 831 * 832 * MAX_ODR * (fs_max - fs + 1) = fs_max * odr_div * odr <=> 833 * fs_max - fs + 1 = fs_max * odr_div * odr / MAX_ODR <=> 834 * fs = 1 + fs_max - fs_max * odr_div * odr / MAX_ODR 835 * (used in ad4130_fs_to_freq) 836 */ 837 838static void ad4130_freq_to_fs(enum ad4130_filter_mode filter_mode, 839 int val, int val2, unsigned int *fs) 840{ 841 const struct ad4130_filter_config *filter_config = 842 &ad4130_filter_configs[filter_mode]; 843 u64 dividend, divisor; 844 int temp; 845 846 dividend = filter_config->fs_max * filter_config->odr_div * 847 ((u64)val * NANO + val2); 848 divisor = (u64)AD4130_MAX_ODR * NANO; 849 850 temp = AD4130_FILTER_SELECT_MIN + filter_config->fs_max - 851 DIV64_U64_ROUND_CLOSEST(dividend, divisor); 852 853 if (temp < AD4130_FILTER_SELECT_MIN) 854 temp = AD4130_FILTER_SELECT_MIN; 855 else if (temp > filter_config->fs_max) 856 temp = filter_config->fs_max; 857 858 *fs = temp; 859} 860 861static void ad4130_fs_to_freq(enum ad4130_filter_mode filter_mode, 862 unsigned int fs, int *val, int *val2) 863{ 864 const struct ad4130_filter_config *filter_config = 865 &ad4130_filter_configs[filter_mode]; 866 unsigned int dividend, divisor; 867 u64 temp; 868 869 dividend = (filter_config->fs_max - fs + AD4130_FILTER_SELECT_MIN) * 870 AD4130_MAX_ODR; 871 divisor = filter_config->fs_max * filter_config->odr_div; 872 873 temp = div_u64((u64)dividend * NANO, divisor); 874 *val = div_u64_rem(temp, NANO, val2); 875} 876 877static int ad4130_set_filter_mode(struct iio_dev *indio_dev, 878 const struct iio_chan_spec *chan, 879 unsigned int val) 880{ 881 struct ad4130_state *st = iio_priv(indio_dev); 882 unsigned int channel = chan->scan_index; 883 struct ad4130_chan_info *chan_info = &st->chans_info[channel]; 884 struct ad4130_setup_info *setup_info = &chan_info->setup; 885 enum ad4130_filter_mode old_filter_mode; 886 int freq_val, freq_val2; 887 unsigned int old_fs; 888 int ret = 0; 889 890 guard(mutex)(&st->lock); 891 if (setup_info->filter_mode == val) 892 return 0; 893 894 old_fs = setup_info->fs; 895 old_filter_mode = setup_info->filter_mode; 896 897 /* 898 * When switching between filter modes, try to match the ODR as 899 * close as possible. To do this, convert the current FS into ODR 900 * using the old filter mode, then convert it back into FS using 901 * the new filter mode. 902 */ 903 ad4130_fs_to_freq(setup_info->filter_mode, setup_info->fs, 904 &freq_val, &freq_val2); 905 906 ad4130_freq_to_fs(val, freq_val, freq_val2, &setup_info->fs); 907 908 setup_info->filter_mode = val; 909 910 ret = ad4130_write_channel_setup(st, channel, false); 911 if (ret) { 912 setup_info->fs = old_fs; 913 setup_info->filter_mode = old_filter_mode; 914 return ret; 915 } 916 917 return 0; 918} 919 920static int ad4130_get_filter_mode(struct iio_dev *indio_dev, 921 const struct iio_chan_spec *chan) 922{ 923 struct ad4130_state *st = iio_priv(indio_dev); 924 unsigned int channel = chan->scan_index; 925 struct ad4130_setup_info *setup_info = &st->chans_info[channel].setup; 926 enum ad4130_filter_mode filter_mode; 927 928 guard(mutex)(&st->lock); 929 filter_mode = setup_info->filter_mode; 930 931 return filter_mode; 932} 933 934static const struct iio_enum ad4130_filter_mode_enum = { 935 .items = ad4130_filter_modes_str, 936 .num_items = ARRAY_SIZE(ad4130_filter_modes_str), 937 .set = ad4130_set_filter_mode, 938 .get = ad4130_get_filter_mode, 939}; 940 941static const struct iio_chan_spec_ext_info ad4130_filter_mode_ext_info[] = { 942 IIO_ENUM("filter_mode", IIO_SEPARATE, &ad4130_filter_mode_enum), 943 IIO_ENUM_AVAILABLE("filter_mode", IIO_SHARED_BY_TYPE, 944 &ad4130_filter_mode_enum), 945 { } 946}; 947 948static const struct iio_chan_spec ad4130_channel_template = { 949 .type = IIO_VOLTAGE, 950 .indexed = 1, 951 .differential = 1, 952 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 953 BIT(IIO_CHAN_INFO_SCALE) | 954 BIT(IIO_CHAN_INFO_OFFSET) | 955 BIT(IIO_CHAN_INFO_SAMP_FREQ), 956 .info_mask_separate_available = BIT(IIO_CHAN_INFO_SCALE) | 957 BIT(IIO_CHAN_INFO_SAMP_FREQ), 958 .ext_info = ad4130_filter_mode_ext_info, 959 .scan_type = { 960 .sign = 'u', 961 .endianness = IIO_BE, 962 }, 963}; 964 965static int ad4130_set_channel_pga(struct ad4130_state *st, unsigned int channel, 966 int val, int val2) 967{ 968 struct ad4130_chan_info *chan_info = &st->chans_info[channel]; 969 struct ad4130_setup_info *setup_info = &chan_info->setup; 970 unsigned int pga, old_pga; 971 int ret; 972 973 for (pga = 0; pga < AD4130_MAX_PGA; pga++) 974 if (val == st->scale_tbls[setup_info->ref_sel][pga][0] && 975 val2 == st->scale_tbls[setup_info->ref_sel][pga][1]) 976 break; 977 978 if (pga == AD4130_MAX_PGA) 979 return -EINVAL; 980 981 guard(mutex)(&st->lock); 982 if (pga == setup_info->pga) 983 return 0; 984 985 old_pga = setup_info->pga; 986 setup_info->pga = pga; 987 988 ret = ad4130_write_channel_setup(st, channel, false); 989 if (ret) { 990 setup_info->pga = old_pga; 991 return ret; 992 } 993 994 return 0; 995} 996 997static int ad4130_set_channel_freq(struct ad4130_state *st, 998 unsigned int channel, int val, int val2) 999{ 1000 struct ad4130_chan_info *chan_info = &st->chans_info[channel]; 1001 struct ad4130_setup_info *setup_info = &chan_info->setup; 1002 unsigned int fs, old_fs; 1003 int ret; 1004 1005 guard(mutex)(&st->lock); 1006 old_fs = setup_info->fs; 1007 1008 ad4130_freq_to_fs(setup_info->filter_mode, val, val2, &fs); 1009 1010 if (fs == setup_info->fs) 1011 return 0; 1012 1013 setup_info->fs = fs; 1014 1015 ret = ad4130_write_channel_setup(st, channel, false); 1016 if (ret) { 1017 setup_info->fs = old_fs; 1018 return ret; 1019 } 1020 1021 return 0; 1022} 1023 1024static int _ad4130_read_sample(struct iio_dev *indio_dev, unsigned int channel, 1025 int *val) 1026{ 1027 struct ad4130_state *st = iio_priv(indio_dev); 1028 int ret; 1029 1030 ret = ad4130_set_channel_enable(st, channel, true); 1031 if (ret) 1032 return ret; 1033 1034 reinit_completion(&st->completion); 1035 1036 ret = ad4130_set_mode(st, AD4130_MODE_CONTINUOUS); 1037 if (ret) 1038 return ret; 1039 1040 ret = wait_for_completion_timeout(&st->completion, 1041 msecs_to_jiffies(1000)); 1042 if (!ret) 1043 return -ETIMEDOUT; 1044 1045 ret = ad4130_set_mode(st, AD4130_MODE_IDLE); 1046 if (ret) 1047 return ret; 1048 1049 ret = regmap_read(st->regmap, AD4130_DATA_REG, val); 1050 if (ret) 1051 return ret; 1052 1053 ret = ad4130_set_channel_enable(st, channel, false); 1054 if (ret) 1055 return ret; 1056 1057 return IIO_VAL_INT; 1058} 1059 1060static int ad4130_read_sample(struct iio_dev *indio_dev, unsigned int channel, 1061 int *val) 1062{ 1063 iio_device_claim_direct_scoped(return -EBUSY, indio_dev) { 1064 struct ad4130_state *st = iio_priv(indio_dev); 1065 1066 guard(mutex)(&st->lock); 1067 return _ad4130_read_sample(indio_dev, channel, val); 1068 } 1069 unreachable(); 1070} 1071 1072static int ad4130_read_raw(struct iio_dev *indio_dev, 1073 struct iio_chan_spec const *chan, 1074 int *val, int *val2, long info) 1075{ 1076 struct ad4130_state *st = iio_priv(indio_dev); 1077 unsigned int channel = chan->scan_index; 1078 struct ad4130_setup_info *setup_info = &st->chans_info[channel].setup; 1079 1080 switch (info) { 1081 case IIO_CHAN_INFO_RAW: 1082 return ad4130_read_sample(indio_dev, channel, val); 1083 case IIO_CHAN_INFO_SCALE: { 1084 guard(mutex)(&st->lock); 1085 *val = st->scale_tbls[setup_info->ref_sel][setup_info->pga][0]; 1086 *val2 = st->scale_tbls[setup_info->ref_sel][setup_info->pga][1]; 1087 1088 return IIO_VAL_INT_PLUS_NANO; 1089 } 1090 case IIO_CHAN_INFO_OFFSET: 1091 *val = st->bipolar ? -BIT(chan->scan_type.realbits - 1) : 0; 1092 1093 return IIO_VAL_INT; 1094 case IIO_CHAN_INFO_SAMP_FREQ: { 1095 guard(mutex)(&st->lock); 1096 ad4130_fs_to_freq(setup_info->filter_mode, setup_info->fs, 1097 val, val2); 1098 1099 return IIO_VAL_INT_PLUS_NANO; 1100 } 1101 default: 1102 return -EINVAL; 1103 } 1104} 1105 1106static int ad4130_read_avail(struct iio_dev *indio_dev, 1107 struct iio_chan_spec const *chan, 1108 const int **vals, int *type, int *length, 1109 long info) 1110{ 1111 struct ad4130_state *st = iio_priv(indio_dev); 1112 unsigned int channel = chan->scan_index; 1113 struct ad4130_setup_info *setup_info = &st->chans_info[channel].setup; 1114 const struct ad4130_filter_config *filter_config; 1115 1116 switch (info) { 1117 case IIO_CHAN_INFO_SCALE: 1118 *vals = (int *)st->scale_tbls[setup_info->ref_sel]; 1119 *length = ARRAY_SIZE(st->scale_tbls[setup_info->ref_sel]) * 2; 1120 1121 *type = IIO_VAL_INT_PLUS_NANO; 1122 1123 return IIO_AVAIL_LIST; 1124 case IIO_CHAN_INFO_SAMP_FREQ: 1125 scoped_guard(mutex, &st->lock) { 1126 filter_config = &ad4130_filter_configs[setup_info->filter_mode]; 1127 } 1128 1129 *vals = (int *)filter_config->samp_freq_avail; 1130 *length = filter_config->samp_freq_avail_len * 2; 1131 *type = IIO_VAL_FRACTIONAL; 1132 1133 return filter_config->samp_freq_avail_type; 1134 default: 1135 return -EINVAL; 1136 } 1137} 1138 1139static int ad4130_write_raw_get_fmt(struct iio_dev *indio_dev, 1140 struct iio_chan_spec const *chan, 1141 long info) 1142{ 1143 switch (info) { 1144 case IIO_CHAN_INFO_SCALE: 1145 case IIO_CHAN_INFO_SAMP_FREQ: 1146 return IIO_VAL_INT_PLUS_NANO; 1147 default: 1148 return -EINVAL; 1149 } 1150} 1151 1152static int ad4130_write_raw(struct iio_dev *indio_dev, 1153 struct iio_chan_spec const *chan, 1154 int val, int val2, long info) 1155{ 1156 struct ad4130_state *st = iio_priv(indio_dev); 1157 unsigned int channel = chan->scan_index; 1158 1159 switch (info) { 1160 case IIO_CHAN_INFO_SCALE: 1161 return ad4130_set_channel_pga(st, channel, val, val2); 1162 case IIO_CHAN_INFO_SAMP_FREQ: 1163 return ad4130_set_channel_freq(st, channel, val, val2); 1164 default: 1165 return -EINVAL; 1166 } 1167} 1168 1169static int ad4130_reg_access(struct iio_dev *indio_dev, unsigned int reg, 1170 unsigned int writeval, unsigned int *readval) 1171{ 1172 struct ad4130_state *st = iio_priv(indio_dev); 1173 1174 if (readval) 1175 return regmap_read(st->regmap, reg, readval); 1176 1177 return regmap_write(st->regmap, reg, writeval); 1178} 1179 1180static int ad4130_update_scan_mode(struct iio_dev *indio_dev, 1181 const unsigned long *scan_mask) 1182{ 1183 struct ad4130_state *st = iio_priv(indio_dev); 1184 unsigned int channel; 1185 unsigned int val = 0; 1186 int ret; 1187 1188 guard(mutex)(&st->lock); 1189 1190 for_each_set_bit(channel, scan_mask, indio_dev->num_channels) { 1191 ret = ad4130_set_channel_enable(st, channel, true); 1192 if (ret) 1193 return ret; 1194 1195 val++; 1196 } 1197 1198 st->num_enabled_channels = val; 1199 1200 return 0; 1201} 1202 1203static int ad4130_set_fifo_watermark(struct iio_dev *indio_dev, unsigned int val) 1204{ 1205 struct ad4130_state *st = iio_priv(indio_dev); 1206 unsigned int eff; 1207 int ret; 1208 1209 if (val > AD4130_FIFO_SIZE) 1210 return -EINVAL; 1211 1212 eff = val * st->num_enabled_channels; 1213 if (eff > AD4130_FIFO_SIZE) 1214 /* 1215 * Always set watermark to a multiple of the number of 1216 * enabled channels to avoid making the FIFO unaligned. 1217 */ 1218 eff = rounddown(AD4130_FIFO_SIZE, st->num_enabled_channels); 1219 1220 guard(mutex)(&st->lock); 1221 1222 ret = regmap_update_bits(st->regmap, AD4130_FIFO_CONTROL_REG, 1223 AD4130_FIFO_CONTROL_WM_MASK, 1224 FIELD_PREP(AD4130_FIFO_CONTROL_WM_MASK, 1225 ad4130_watermark_reg_val(eff))); 1226 if (ret) 1227 return ret; 1228 1229 st->effective_watermark = eff; 1230 st->watermark = val; 1231 1232 return 0; 1233} 1234 1235static const struct iio_info ad4130_info = { 1236 .read_raw = ad4130_read_raw, 1237 .read_avail = ad4130_read_avail, 1238 .write_raw_get_fmt = ad4130_write_raw_get_fmt, 1239 .write_raw = ad4130_write_raw, 1240 .update_scan_mode = ad4130_update_scan_mode, 1241 .hwfifo_set_watermark = ad4130_set_fifo_watermark, 1242 .debugfs_reg_access = ad4130_reg_access, 1243}; 1244 1245static int ad4130_buffer_postenable(struct iio_dev *indio_dev) 1246{ 1247 struct ad4130_state *st = iio_priv(indio_dev); 1248 int ret; 1249 1250 guard(mutex)(&st->lock); 1251 1252 ret = ad4130_set_watermark_interrupt_en(st, true); 1253 if (ret) 1254 return ret; 1255 1256 ret = irq_set_irq_type(st->spi->irq, st->inv_irq_trigger); 1257 if (ret) 1258 return ret; 1259 1260 ret = ad4130_set_fifo_mode(st, AD4130_FIFO_MODE_WM); 1261 if (ret) 1262 return ret; 1263 1264 return ad4130_set_mode(st, AD4130_MODE_CONTINUOUS); 1265} 1266 1267static int ad4130_buffer_predisable(struct iio_dev *indio_dev) 1268{ 1269 struct ad4130_state *st = iio_priv(indio_dev); 1270 unsigned int i; 1271 int ret; 1272 1273 guard(mutex)(&st->lock); 1274 1275 ret = ad4130_set_mode(st, AD4130_MODE_IDLE); 1276 if (ret) 1277 return ret; 1278 1279 ret = irq_set_irq_type(st->spi->irq, st->irq_trigger); 1280 if (ret) 1281 return ret; 1282 1283 ret = ad4130_set_fifo_mode(st, AD4130_FIFO_MODE_DISABLED); 1284 if (ret) 1285 return ret; 1286 1287 ret = ad4130_set_watermark_interrupt_en(st, false); 1288 if (ret) 1289 return ret; 1290 1291 /* 1292 * update_scan_mode() is not called in the disable path, disable all 1293 * channels here. 1294 */ 1295 for (i = 0; i < indio_dev->num_channels; i++) { 1296 ret = ad4130_set_channel_enable(st, i, false); 1297 if (ret) 1298 return ret; 1299 } 1300 1301 return 0; 1302} 1303 1304static const struct iio_buffer_setup_ops ad4130_buffer_ops = { 1305 .postenable = ad4130_buffer_postenable, 1306 .predisable = ad4130_buffer_predisable, 1307}; 1308 1309static ssize_t hwfifo_watermark_show(struct device *dev, 1310 struct device_attribute *attr, char *buf) 1311{ 1312 struct ad4130_state *st = iio_priv(dev_to_iio_dev(dev)); 1313 unsigned int val; 1314 1315 guard(mutex)(&st->lock); 1316 val = st->watermark; 1317 1318 return sysfs_emit(buf, "%d\n", val); 1319} 1320 1321static ssize_t hwfifo_enabled_show(struct device *dev, 1322 struct device_attribute *attr, char *buf) 1323{ 1324 struct ad4130_state *st = iio_priv(dev_to_iio_dev(dev)); 1325 unsigned int val; 1326 int ret; 1327 1328 ret = regmap_read(st->regmap, AD4130_FIFO_CONTROL_REG, &val); 1329 if (ret) 1330 return ret; 1331 1332 val = FIELD_GET(AD4130_FIFO_CONTROL_MODE_MASK, val); 1333 1334 return sysfs_emit(buf, "%d\n", val != AD4130_FIFO_MODE_DISABLED); 1335} 1336 1337static ssize_t hwfifo_watermark_min_show(struct device *dev, 1338 struct device_attribute *attr, 1339 char *buf) 1340{ 1341 return sysfs_emit(buf, "%s\n", "1"); 1342} 1343 1344static ssize_t hwfifo_watermark_max_show(struct device *dev, 1345 struct device_attribute *attr, 1346 char *buf) 1347{ 1348 return sysfs_emit(buf, "%s\n", __stringify(AD4130_FIFO_SIZE)); 1349} 1350 1351static IIO_DEVICE_ATTR_RO(hwfifo_watermark_min, 0); 1352static IIO_DEVICE_ATTR_RO(hwfifo_watermark_max, 0); 1353static IIO_DEVICE_ATTR_RO(hwfifo_watermark, 0); 1354static IIO_DEVICE_ATTR_RO(hwfifo_enabled, 0); 1355 1356static const struct iio_dev_attr *ad4130_fifo_attributes[] = { 1357 &iio_dev_attr_hwfifo_watermark_min, 1358 &iio_dev_attr_hwfifo_watermark_max, 1359 &iio_dev_attr_hwfifo_watermark, 1360 &iio_dev_attr_hwfifo_enabled, 1361 NULL 1362}; 1363 1364static int _ad4130_find_table_index(const unsigned int *tbl, size_t len, 1365 unsigned int val) 1366{ 1367 unsigned int i; 1368 1369 for (i = 0; i < len; i++) 1370 if (tbl[i] == val) 1371 return i; 1372 1373 return -EINVAL; 1374} 1375 1376#define ad4130_find_table_index(table, val) \ 1377 _ad4130_find_table_index(table, ARRAY_SIZE(table), val) 1378 1379static int ad4130_get_ref_voltage(struct ad4130_state *st, 1380 enum ad4130_ref_sel ref_sel) 1381{ 1382 switch (ref_sel) { 1383 case AD4130_REF_REFIN1: 1384 return regulator_get_voltage(st->regulators[2].consumer); 1385 case AD4130_REF_REFIN2: 1386 return regulator_get_voltage(st->regulators[3].consumer); 1387 case AD4130_REF_AVDD_AVSS: 1388 return regulator_get_voltage(st->regulators[0].consumer); 1389 case AD4130_REF_REFOUT_AVSS: 1390 return st->int_ref_uv; 1391 default: 1392 return -EINVAL; 1393 } 1394} 1395 1396static int ad4130_parse_fw_setup(struct ad4130_state *st, 1397 struct fwnode_handle *child, 1398 struct ad4130_setup_info *setup_info) 1399{ 1400 struct device *dev = &st->spi->dev; 1401 u32 tmp; 1402 int ret; 1403 1404 tmp = 0; 1405 fwnode_property_read_u32(child, "adi,excitation-current-0-nanoamp", &tmp); 1406 ret = ad4130_find_table_index(ad4130_iout_current_na_tbl, tmp); 1407 if (ret < 0) 1408 return dev_err_probe(dev, ret, 1409 "Invalid excitation current %unA\n", tmp); 1410 setup_info->iout0_val = ret; 1411 1412 tmp = 0; 1413 fwnode_property_read_u32(child, "adi,excitation-current-1-nanoamp", &tmp); 1414 ret = ad4130_find_table_index(ad4130_iout_current_na_tbl, tmp); 1415 if (ret < 0) 1416 return dev_err_probe(dev, ret, 1417 "Invalid excitation current %unA\n", tmp); 1418 setup_info->iout1_val = ret; 1419 1420 tmp = 0; 1421 fwnode_property_read_u32(child, "adi,burnout-current-nanoamp", &tmp); 1422 ret = ad4130_find_table_index(ad4130_burnout_current_na_tbl, tmp); 1423 if (ret < 0) 1424 return dev_err_probe(dev, ret, 1425 "Invalid burnout current %unA\n", tmp); 1426 setup_info->burnout = ret; 1427 1428 setup_info->ref_bufp = fwnode_property_read_bool(child, "adi,buffered-positive"); 1429 setup_info->ref_bufm = fwnode_property_read_bool(child, "adi,buffered-negative"); 1430 1431 setup_info->ref_sel = AD4130_REF_REFIN1; 1432 fwnode_property_read_u32(child, "adi,reference-select", 1433 &setup_info->ref_sel); 1434 if (setup_info->ref_sel >= AD4130_REF_SEL_MAX) 1435 return dev_err_probe(dev, -EINVAL, 1436 "Invalid reference selected %u\n", 1437 setup_info->ref_sel); 1438 1439 if (setup_info->ref_sel == AD4130_REF_REFOUT_AVSS) 1440 st->int_ref_en = true; 1441 1442 ret = ad4130_get_ref_voltage(st, setup_info->ref_sel); 1443 if (ret < 0) 1444 return dev_err_probe(dev, ret, "Cannot use reference %u\n", 1445 setup_info->ref_sel); 1446 1447 return 0; 1448} 1449 1450static int ad4130_validate_diff_channel(struct ad4130_state *st, u32 pin) 1451{ 1452 struct device *dev = &st->spi->dev; 1453 1454 if (pin >= AD4130_MAX_DIFF_INPUTS) 1455 return dev_err_probe(dev, -EINVAL, 1456 "Invalid differential channel %u\n", pin); 1457 1458 if (pin >= AD4130_MAX_ANALOG_PINS) 1459 return 0; 1460 1461 if (st->pins_fn[pin] == AD4130_PIN_FN_SPECIAL) 1462 return dev_err_probe(dev, -EINVAL, 1463 "Pin %u already used with fn %u\n", pin, 1464 st->pins_fn[pin]); 1465 1466 st->pins_fn[pin] |= AD4130_PIN_FN_DIFF; 1467 1468 return 0; 1469} 1470 1471static int ad4130_validate_diff_channels(struct ad4130_state *st, 1472 u32 *pins, unsigned int len) 1473{ 1474 unsigned int i; 1475 int ret; 1476 1477 for (i = 0; i < len; i++) { 1478 ret = ad4130_validate_diff_channel(st, pins[i]); 1479 if (ret) 1480 return ret; 1481 } 1482 1483 return 0; 1484} 1485 1486static int ad4130_validate_excitation_pin(struct ad4130_state *st, u32 pin) 1487{ 1488 struct device *dev = &st->spi->dev; 1489 1490 if (pin >= AD4130_MAX_ANALOG_PINS) 1491 return dev_err_probe(dev, -EINVAL, 1492 "Invalid excitation pin %u\n", pin); 1493 1494 if (st->pins_fn[pin] == AD4130_PIN_FN_SPECIAL) 1495 return dev_err_probe(dev, -EINVAL, 1496 "Pin %u already used with fn %u\n", pin, 1497 st->pins_fn[pin]); 1498 1499 st->pins_fn[pin] |= AD4130_PIN_FN_EXCITATION; 1500 1501 return 0; 1502} 1503 1504static int ad4130_validate_vbias_pin(struct ad4130_state *st, u32 pin) 1505{ 1506 struct device *dev = &st->spi->dev; 1507 1508 if (pin >= AD4130_MAX_ANALOG_PINS) 1509 return dev_err_probe(dev, -EINVAL, "Invalid vbias pin %u\n", 1510 pin); 1511 1512 if (st->pins_fn[pin] == AD4130_PIN_FN_SPECIAL) 1513 return dev_err_probe(dev, -EINVAL, 1514 "Pin %u already used with fn %u\n", pin, 1515 st->pins_fn[pin]); 1516 1517 st->pins_fn[pin] |= AD4130_PIN_FN_VBIAS; 1518 1519 return 0; 1520} 1521 1522static int ad4130_validate_vbias_pins(struct ad4130_state *st, 1523 u32 *pins, unsigned int len) 1524{ 1525 unsigned int i; 1526 int ret; 1527 1528 for (i = 0; i < st->num_vbias_pins; i++) { 1529 ret = ad4130_validate_vbias_pin(st, pins[i]); 1530 if (ret) 1531 return ret; 1532 } 1533 1534 return 0; 1535} 1536 1537static int ad4130_parse_fw_channel(struct iio_dev *indio_dev, 1538 struct fwnode_handle *child) 1539{ 1540 struct ad4130_state *st = iio_priv(indio_dev); 1541 unsigned int resolution = ad4130_resolution(st); 1542 unsigned int index = indio_dev->num_channels++; 1543 struct device *dev = &st->spi->dev; 1544 struct ad4130_chan_info *chan_info; 1545 struct iio_chan_spec *chan; 1546 u32 pins[2]; 1547 int ret; 1548 1549 if (index >= AD4130_MAX_CHANNELS) 1550 return dev_err_probe(dev, -EINVAL, "Too many channels\n"); 1551 1552 chan = &st->chans[index]; 1553 chan_info = &st->chans_info[index]; 1554 1555 *chan = ad4130_channel_template; 1556 chan->scan_type.realbits = resolution; 1557 chan->scan_type.storagebits = resolution; 1558 chan->scan_index = index; 1559 1560 chan_info->slot = AD4130_INVALID_SLOT; 1561 chan_info->setup.fs = AD4130_FILTER_SELECT_MIN; 1562 chan_info->initialized = true; 1563 1564 ret = fwnode_property_read_u32_array(child, "diff-channels", pins, 1565 ARRAY_SIZE(pins)); 1566 if (ret) 1567 return ret; 1568 1569 ret = ad4130_validate_diff_channels(st, pins, ARRAY_SIZE(pins)); 1570 if (ret) 1571 return ret; 1572 1573 chan->channel = pins[0]; 1574 chan->channel2 = pins[1]; 1575 1576 ret = ad4130_parse_fw_setup(st, child, &chan_info->setup); 1577 if (ret) 1578 return ret; 1579 1580 fwnode_property_read_u32(child, "adi,excitation-pin-0", 1581 &chan_info->iout0); 1582 if (chan_info->setup.iout0_val != AD4130_IOUT_OFF) { 1583 ret = ad4130_validate_excitation_pin(st, chan_info->iout0); 1584 if (ret) 1585 return ret; 1586 } 1587 1588 fwnode_property_read_u32(child, "adi,excitation-pin-1", 1589 &chan_info->iout1); 1590 if (chan_info->setup.iout1_val != AD4130_IOUT_OFF) { 1591 ret = ad4130_validate_excitation_pin(st, chan_info->iout1); 1592 if (ret) 1593 return ret; 1594 } 1595 1596 return 0; 1597} 1598 1599static int ad4130_parse_fw_children(struct iio_dev *indio_dev) 1600{ 1601 struct ad4130_state *st = iio_priv(indio_dev); 1602 struct device *dev = &st->spi->dev; 1603 struct fwnode_handle *child; 1604 int ret; 1605 1606 indio_dev->channels = st->chans; 1607 1608 device_for_each_child_node(dev, child) { 1609 ret = ad4130_parse_fw_channel(indio_dev, child); 1610 if (ret) { 1611 fwnode_handle_put(child); 1612 return ret; 1613 } 1614 } 1615 1616 return 0; 1617} 1618 1619static int ad4310_parse_fw(struct iio_dev *indio_dev) 1620{ 1621 struct ad4130_state *st = iio_priv(indio_dev); 1622 struct device *dev = &st->spi->dev; 1623 u32 ext_clk_freq = AD4130_MCLK_FREQ_76_8KHZ; 1624 unsigned int i; 1625 int avdd_uv; 1626 int irq; 1627 int ret; 1628 1629 st->mclk = devm_clk_get_optional(dev, "mclk"); 1630 if (IS_ERR(st->mclk)) 1631 return dev_err_probe(dev, PTR_ERR(st->mclk), 1632 "Failed to get mclk\n"); 1633 1634 st->int_pin_sel = AD4130_INT_PIN_INT; 1635 1636 for (i = 0; i < ARRAY_SIZE(ad4130_int_pin_names); i++) { 1637 irq = fwnode_irq_get_byname(dev_fwnode(dev), 1638 ad4130_int_pin_names[i]); 1639 if (irq > 0) { 1640 st->int_pin_sel = i; 1641 break; 1642 } 1643 } 1644 1645 if (st->int_pin_sel == AD4130_INT_PIN_DOUT) 1646 return dev_err_probe(dev, -EINVAL, 1647 "Cannot use DOUT as interrupt pin\n"); 1648 1649 if (st->int_pin_sel == AD4130_INT_PIN_P2) 1650 st->pins_fn[AD4130_AIN3_P2] = AD4130_PIN_FN_SPECIAL; 1651 1652 device_property_read_u32(dev, "adi,ext-clk-freq-hz", &ext_clk_freq); 1653 if (ext_clk_freq != AD4130_MCLK_FREQ_153_6KHZ && 1654 ext_clk_freq != AD4130_MCLK_FREQ_76_8KHZ) 1655 return dev_err_probe(dev, -EINVAL, 1656 "Invalid external clock frequency %u\n", 1657 ext_clk_freq); 1658 1659 if (st->mclk && ext_clk_freq == AD4130_MCLK_FREQ_153_6KHZ) 1660 st->mclk_sel = AD4130_MCLK_153_6KHZ_EXT; 1661 else if (st->mclk) 1662 st->mclk_sel = AD4130_MCLK_76_8KHZ_EXT; 1663 else 1664 st->mclk_sel = AD4130_MCLK_76_8KHZ; 1665 1666 if (st->int_pin_sel == AD4130_INT_PIN_CLK && 1667 st->mclk_sel != AD4130_MCLK_76_8KHZ) 1668 return dev_err_probe(dev, -EINVAL, 1669 "Invalid clock %u for interrupt pin %u\n", 1670 st->mclk_sel, st->int_pin_sel); 1671 1672 st->int_ref_uv = AD4130_INT_REF_2_5V; 1673 1674 /* 1675 * When the AVDD supply is set to below 2.5V the internal reference of 1676 * 1.25V should be selected. 1677 * See datasheet page 37, section ADC REFERENCE. 1678 */ 1679 avdd_uv = regulator_get_voltage(st->regulators[0].consumer); 1680 if (avdd_uv > 0 && avdd_uv < AD4130_INT_REF_2_5V) 1681 st->int_ref_uv = AD4130_INT_REF_1_25V; 1682 1683 st->bipolar = device_property_read_bool(dev, "adi,bipolar"); 1684 1685 ret = device_property_count_u32(dev, "adi,vbias-pins"); 1686 if (ret > 0) { 1687 if (ret > AD4130_MAX_ANALOG_PINS) 1688 return dev_err_probe(dev, -EINVAL, 1689 "Too many vbias pins %u\n", ret); 1690 1691 st->num_vbias_pins = ret; 1692 1693 ret = device_property_read_u32_array(dev, "adi,vbias-pins", 1694 st->vbias_pins, 1695 st->num_vbias_pins); 1696 if (ret) 1697 return dev_err_probe(dev, ret, 1698 "Failed to read vbias pins\n"); 1699 1700 ret = ad4130_validate_vbias_pins(st, st->vbias_pins, 1701 st->num_vbias_pins); 1702 if (ret) 1703 return ret; 1704 } 1705 1706 ret = ad4130_parse_fw_children(indio_dev); 1707 if (ret) 1708 return ret; 1709 1710 return 0; 1711} 1712 1713static void ad4130_fill_scale_tbls(struct ad4130_state *st) 1714{ 1715 unsigned int pow = ad4130_resolution(st) - st->bipolar; 1716 unsigned int i, j; 1717 1718 for (i = 0; i < AD4130_REF_SEL_MAX; i++) { 1719 int ret; 1720 u64 nv; 1721 1722 ret = ad4130_get_ref_voltage(st, i); 1723 if (ret < 0) 1724 continue; 1725 1726 nv = (u64)ret * NANO; 1727 1728 for (j = 0; j < AD4130_MAX_PGA; j++) 1729 st->scale_tbls[i][j][1] = div_u64(nv >> (pow + j), MILLI); 1730 } 1731} 1732 1733static void ad4130_clk_disable_unprepare(void *clk) 1734{ 1735 clk_disable_unprepare(clk); 1736} 1737 1738static int ad4130_set_mclk_sel(struct ad4130_state *st, 1739 enum ad4130_mclk_sel mclk_sel) 1740{ 1741 return regmap_update_bits(st->regmap, AD4130_ADC_CONTROL_REG, 1742 AD4130_ADC_CONTROL_MCLK_SEL_MASK, 1743 FIELD_PREP(AD4130_ADC_CONTROL_MCLK_SEL_MASK, 1744 mclk_sel)); 1745} 1746 1747static unsigned long ad4130_int_clk_recalc_rate(struct clk_hw *hw, 1748 unsigned long parent_rate) 1749{ 1750 return AD4130_MCLK_FREQ_76_8KHZ; 1751} 1752 1753static int ad4130_int_clk_is_enabled(struct clk_hw *hw) 1754{ 1755 struct ad4130_state *st = container_of(hw, struct ad4130_state, int_clk_hw); 1756 1757 return st->mclk_sel == AD4130_MCLK_76_8KHZ_OUT; 1758} 1759 1760static int ad4130_int_clk_prepare(struct clk_hw *hw) 1761{ 1762 struct ad4130_state *st = container_of(hw, struct ad4130_state, int_clk_hw); 1763 int ret; 1764 1765 ret = ad4130_set_mclk_sel(st, AD4130_MCLK_76_8KHZ_OUT); 1766 if (ret) 1767 return ret; 1768 1769 st->mclk_sel = AD4130_MCLK_76_8KHZ_OUT; 1770 1771 return 0; 1772} 1773 1774static void ad4130_int_clk_unprepare(struct clk_hw *hw) 1775{ 1776 struct ad4130_state *st = container_of(hw, struct ad4130_state, int_clk_hw); 1777 int ret; 1778 1779 ret = ad4130_set_mclk_sel(st, AD4130_MCLK_76_8KHZ); 1780 if (ret) 1781 return; 1782 1783 st->mclk_sel = AD4130_MCLK_76_8KHZ; 1784} 1785 1786static const struct clk_ops ad4130_int_clk_ops = { 1787 .recalc_rate = ad4130_int_clk_recalc_rate, 1788 .is_enabled = ad4130_int_clk_is_enabled, 1789 .prepare = ad4130_int_clk_prepare, 1790 .unprepare = ad4130_int_clk_unprepare, 1791}; 1792 1793static int ad4130_setup_int_clk(struct ad4130_state *st) 1794{ 1795 struct device *dev = &st->spi->dev; 1796 struct device_node *of_node = dev_of_node(dev); 1797 struct clk_init_data init = {}; 1798 const char *clk_name; 1799 int ret; 1800 1801 if (st->int_pin_sel == AD4130_INT_PIN_CLK || 1802 st->mclk_sel != AD4130_MCLK_76_8KHZ) 1803 return 0; 1804 1805 if (!of_node) 1806 return 0; 1807 1808 clk_name = of_node->name; 1809 of_property_read_string(of_node, "clock-output-names", &clk_name); 1810 1811 init.name = clk_name; 1812 init.ops = &ad4130_int_clk_ops; 1813 1814 st->int_clk_hw.init = &init; 1815 ret = devm_clk_hw_register(dev, &st->int_clk_hw); 1816 if (ret) 1817 return ret; 1818 1819 return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, 1820 &st->int_clk_hw); 1821} 1822 1823static int ad4130_setup(struct iio_dev *indio_dev) 1824{ 1825 struct ad4130_state *st = iio_priv(indio_dev); 1826 struct device *dev = &st->spi->dev; 1827 unsigned int int_ref_val; 1828 unsigned long rate = AD4130_MCLK_FREQ_76_8KHZ; 1829 unsigned int val; 1830 unsigned int i; 1831 int ret; 1832 1833 if (st->mclk_sel == AD4130_MCLK_153_6KHZ_EXT) 1834 rate = AD4130_MCLK_FREQ_153_6KHZ; 1835 1836 ret = clk_set_rate(st->mclk, rate); 1837 if (ret) 1838 return ret; 1839 1840 ret = clk_prepare_enable(st->mclk); 1841 if (ret) 1842 return ret; 1843 1844 ret = devm_add_action_or_reset(dev, ad4130_clk_disable_unprepare, 1845 st->mclk); 1846 if (ret) 1847 return ret; 1848 1849 if (st->int_ref_uv == AD4130_INT_REF_2_5V) 1850 int_ref_val = AD4130_INT_REF_VAL_2_5V; 1851 else 1852 int_ref_val = AD4130_INT_REF_VAL_1_25V; 1853 1854 /* Switch to SPI 4-wire mode. */ 1855 val = FIELD_PREP(AD4130_ADC_CONTROL_CSB_EN_MASK, 1); 1856 val |= FIELD_PREP(AD4130_ADC_CONTROL_BIPOLAR_MASK, st->bipolar); 1857 val |= FIELD_PREP(AD4130_ADC_CONTROL_INT_REF_EN_MASK, st->int_ref_en); 1858 val |= FIELD_PREP(AD4130_ADC_CONTROL_MODE_MASK, AD4130_MODE_IDLE); 1859 val |= FIELD_PREP(AD4130_ADC_CONTROL_MCLK_SEL_MASK, st->mclk_sel); 1860 val |= FIELD_PREP(AD4130_ADC_CONTROL_INT_REF_VAL_MASK, int_ref_val); 1861 1862 ret = regmap_write(st->regmap, AD4130_ADC_CONTROL_REG, val); 1863 if (ret) 1864 return ret; 1865 1866 /* 1867 * Configure unused GPIOs for output. If configured, the interrupt 1868 * function of P2 takes priority over the GPIO out function. 1869 */ 1870 val = 0; 1871 for (i = 0; i < AD4130_MAX_GPIOS; i++) 1872 if (st->pins_fn[i + AD4130_AIN2_P1] == AD4130_PIN_FN_NONE) 1873 val |= FIELD_PREP(AD4130_IO_CONTROL_GPIO_CTRL_MASK, BIT(i)); 1874 1875 val |= FIELD_PREP(AD4130_IO_CONTROL_INT_PIN_SEL_MASK, st->int_pin_sel); 1876 1877 ret = regmap_write(st->regmap, AD4130_IO_CONTROL_REG, val); 1878 if (ret) 1879 return ret; 1880 1881 val = 0; 1882 for (i = 0; i < st->num_vbias_pins; i++) 1883 val |= BIT(st->vbias_pins[i]); 1884 1885 ret = regmap_write(st->regmap, AD4130_VBIAS_REG, val); 1886 if (ret) 1887 return ret; 1888 1889 ret = regmap_update_bits(st->regmap, AD4130_FIFO_CONTROL_REG, 1890 AD4130_FIFO_CONTROL_HEADER_MASK, 0); 1891 if (ret) 1892 return ret; 1893 1894 /* FIFO watermark interrupt starts out as enabled, disable it. */ 1895 ret = ad4130_set_watermark_interrupt_en(st, false); 1896 if (ret) 1897 return ret; 1898 1899 /* Setup channels. */ 1900 for (i = 0; i < indio_dev->num_channels; i++) { 1901 struct ad4130_chan_info *chan_info = &st->chans_info[i]; 1902 struct iio_chan_spec *chan = &st->chans[i]; 1903 unsigned int val; 1904 1905 val = FIELD_PREP(AD4130_CHANNEL_AINP_MASK, chan->channel) | 1906 FIELD_PREP(AD4130_CHANNEL_AINM_MASK, chan->channel2) | 1907 FIELD_PREP(AD4130_CHANNEL_IOUT1_MASK, chan_info->iout0) | 1908 FIELD_PREP(AD4130_CHANNEL_IOUT2_MASK, chan_info->iout1); 1909 1910 ret = regmap_write(st->regmap, AD4130_CHANNEL_X_REG(i), val); 1911 if (ret) 1912 return ret; 1913 } 1914 1915 return 0; 1916} 1917 1918static int ad4130_soft_reset(struct ad4130_state *st) 1919{ 1920 int ret; 1921 1922 ret = spi_write(st->spi, st->reset_buf, sizeof(st->reset_buf)); 1923 if (ret) 1924 return ret; 1925 1926 fsleep(AD4130_RESET_SLEEP_US); 1927 1928 return 0; 1929} 1930 1931static void ad4130_disable_regulators(void *data) 1932{ 1933 struct ad4130_state *st = data; 1934 1935 regulator_bulk_disable(ARRAY_SIZE(st->regulators), st->regulators); 1936} 1937 1938static int ad4130_probe(struct spi_device *spi) 1939{ 1940 struct device *dev = &spi->dev; 1941 struct iio_dev *indio_dev; 1942 struct ad4130_state *st; 1943 int ret; 1944 1945 indio_dev = devm_iio_device_alloc(dev, sizeof(*st)); 1946 if (!indio_dev) 1947 return -ENOMEM; 1948 1949 st = iio_priv(indio_dev); 1950 1951 memset(st->reset_buf, 0xff, sizeof(st->reset_buf)); 1952 init_completion(&st->completion); 1953 mutex_init(&st->lock); 1954 st->spi = spi; 1955 1956 /* 1957 * Xfer: [ XFR1 ] [ XFR2 ] 1958 * Master: 0x7D N ...................... 1959 * Slave: ...... DATA1 DATA2 ... DATAN 1960 */ 1961 st->fifo_tx_buf[0] = AD4130_COMMS_READ_MASK | AD4130_FIFO_DATA_REG; 1962 st->fifo_xfer[0].tx_buf = st->fifo_tx_buf; 1963 st->fifo_xfer[0].len = sizeof(st->fifo_tx_buf); 1964 st->fifo_xfer[1].rx_buf = st->fifo_rx_buf; 1965 spi_message_init_with_transfers(&st->fifo_msg, st->fifo_xfer, 1966 ARRAY_SIZE(st->fifo_xfer)); 1967 1968 indio_dev->name = AD4130_NAME; 1969 indio_dev->modes = INDIO_DIRECT_MODE; 1970 indio_dev->info = &ad4130_info; 1971 1972 st->regmap = devm_regmap_init(dev, NULL, st, &ad4130_regmap_config); 1973 if (IS_ERR(st->regmap)) 1974 return PTR_ERR(st->regmap); 1975 1976 st->regulators[0].supply = "avdd"; 1977 st->regulators[1].supply = "iovdd"; 1978 st->regulators[2].supply = "refin1"; 1979 st->regulators[3].supply = "refin2"; 1980 1981 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(st->regulators), 1982 st->regulators); 1983 if (ret) 1984 return dev_err_probe(dev, ret, "Failed to get regulators\n"); 1985 1986 ret = regulator_bulk_enable(ARRAY_SIZE(st->regulators), st->regulators); 1987 if (ret) 1988 return dev_err_probe(dev, ret, "Failed to enable regulators\n"); 1989 1990 ret = devm_add_action_or_reset(dev, ad4130_disable_regulators, st); 1991 if (ret) 1992 return dev_err_probe(dev, ret, 1993 "Failed to add regulators disable action\n"); 1994 1995 ret = ad4130_soft_reset(st); 1996 if (ret) 1997 return ret; 1998 1999 ret = ad4310_parse_fw(indio_dev); 2000 if (ret) 2001 return ret; 2002 2003 ret = ad4130_setup(indio_dev); 2004 if (ret) 2005 return ret; 2006 2007 ret = ad4130_setup_int_clk(st); 2008 if (ret) 2009 return ret; 2010 2011 ad4130_fill_scale_tbls(st); 2012 2013 st->gc.owner = THIS_MODULE; 2014 st->gc.label = AD4130_NAME; 2015 st->gc.base = -1; 2016 st->gc.ngpio = AD4130_MAX_GPIOS; 2017 st->gc.parent = dev; 2018 st->gc.can_sleep = true; 2019 st->gc.init_valid_mask = ad4130_gpio_init_valid_mask; 2020 st->gc.get_direction = ad4130_gpio_get_direction; 2021 st->gc.set = ad4130_gpio_set; 2022 2023 ret = devm_gpiochip_add_data(dev, &st->gc, st); 2024 if (ret) 2025 return ret; 2026 2027 ret = devm_iio_kfifo_buffer_setup_ext(dev, indio_dev, 2028 &ad4130_buffer_ops, 2029 ad4130_fifo_attributes); 2030 if (ret) 2031 return ret; 2032 2033 ret = devm_request_threaded_irq(dev, spi->irq, NULL, 2034 ad4130_irq_handler, IRQF_ONESHOT, 2035 indio_dev->name, indio_dev); 2036 if (ret) 2037 return dev_err_probe(dev, ret, "Failed to request irq\n"); 2038 2039 /* 2040 * When the chip enters FIFO mode, IRQ polarity is inverted. 2041 * When the chip exits FIFO mode, IRQ polarity returns to normal. 2042 * See datasheet pages: 65, FIFO Watermark Interrupt section, 2043 * and 71, Bit Descriptions for STATUS Register, RDYB. 2044 * Cache the normal and inverted IRQ triggers to set them when 2045 * entering and exiting FIFO mode. 2046 */ 2047 st->irq_trigger = irq_get_trigger_type(spi->irq); 2048 if (st->irq_trigger & IRQF_TRIGGER_RISING) 2049 st->inv_irq_trigger = IRQF_TRIGGER_FALLING; 2050 else if (st->irq_trigger & IRQF_TRIGGER_FALLING) 2051 st->inv_irq_trigger = IRQF_TRIGGER_RISING; 2052 else 2053 return dev_err_probe(dev, -EINVAL, "Invalid irq flags: %u\n", 2054 st->irq_trigger); 2055 2056 return devm_iio_device_register(dev, indio_dev); 2057} 2058 2059static const struct of_device_id ad4130_of_match[] = { 2060 { 2061 .compatible = "adi,ad4130", 2062 }, 2063 { } 2064}; 2065MODULE_DEVICE_TABLE(of, ad4130_of_match); 2066 2067static struct spi_driver ad4130_driver = { 2068 .driver = { 2069 .name = AD4130_NAME, 2070 .of_match_table = ad4130_of_match, 2071 }, 2072 .probe = ad4130_probe, 2073}; 2074module_spi_driver(ad4130_driver); 2075 2076MODULE_AUTHOR("Cosmin Tanislav <cosmin.tanislav@analog.com>"); 2077MODULE_DESCRIPTION("Analog Devices AD4130 SPI driver"); 2078MODULE_LICENSE("GPL"); 2079