1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * AD5770R Digital to analog converters driver 4 * 5 * Copyright 2018 Analog Devices Inc. 6 */ 7 8 #include <linux/bits.h> 9 #include <linux/delay.h> 10 #include <linux/device.h> 11 #include <linux/gpio/consumer.h> 12 #include <linux/iio/iio.h> 13 #include <linux/iio/sysfs.h> 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/property.h> 17 #include <linux/regmap.h> 18 #include <linux/regulator/consumer.h> 19 #include <linux/spi/spi.h> 20 21 #define ADI_SPI_IF_CONFIG_A 0x00 22 #define ADI_SPI_IF_CONFIG_B 0x01 23 #define ADI_SPI_IF_DEVICE_CONFIG 0x02 24 #define ADI_SPI_IF_CHIP_TYPE 0x03 25 #define ADI_SPI_IF_PRODUCT_ID_L 0x04 26 #define ADI_SPI_IF_PRODUCT_ID_H 0x05 27 #define ADI_SPI_IF_CHIP_GRADE 0x06 28 #define ADI_SPI_IF_SCRACTH_PAD 0x0A 29 #define ADI_SPI_IF_SPI_REVISION 0x0B 30 #define ADI_SPI_IF_SPI_VENDOR_L 0x0C 31 #define ADI_SPI_IF_SPI_VENDOR_H 0x0D 32 #define ADI_SPI_IF_SPI_STREAM_MODE 0x0E 33 #define ADI_SPI_IF_CONFIG_C 0x10 34 #define ADI_SPI_IF_STATUS_A 0x11 35 36 /* ADI_SPI_IF_CONFIG_A */ 37 #define ADI_SPI_IF_SW_RESET_MSK (BIT(0) | BIT(7)) 38 #define ADI_SPI_IF_SW_RESET_SEL(x) ((x) & ADI_SPI_IF_SW_RESET_MSK) 39 #define ADI_SPI_IF_ADDR_ASC_MSK (BIT(2) | BIT(5)) 40 #define ADI_SPI_IF_ADDR_ASC_SEL(x) (((x) << 2) & ADI_SPI_IF_ADDR_ASC_MSK) 41 42 /* ADI_SPI_IF_CONFIG_B */ 43 #define ADI_SPI_IF_SINGLE_INS_MSK BIT(7) 44 #define ADI_SPI_IF_SINGLE_INS_SEL(x) FIELD_PREP(ADI_SPI_IF_SINGLE_INS_MSK, x) 45 #define ADI_SPI_IF_SHORT_INS_MSK BIT(7) 46 #define ADI_SPI_IF_SHORT_INS_SEL(x) FIELD_PREP(ADI_SPI_IF_SINGLE_INS_MSK, x) 47 48 /* ADI_SPI_IF_CONFIG_C */ 49 #define ADI_SPI_IF_STRICT_REG_MSK BIT(5) 50 #define ADI_SPI_IF_STRICT_REG_GET(x) FIELD_GET(ADI_SPI_IF_STRICT_REG_MSK, x) 51 52 /* AD5770R configuration registers */ 53 #define AD5770R_CHANNEL_CONFIG 0x14 54 #define AD5770R_OUTPUT_RANGE(ch) (0x15 + (ch)) 55 #define AD5770R_FILTER_RESISTOR(ch) (0x1D + (ch)) 56 #define AD5770R_REFERENCE 0x1B 57 #define AD5770R_DAC_LSB(ch) (0x26 + 2 * (ch)) 58 #define AD5770R_DAC_MSB(ch) (0x27 + 2 * (ch)) 59 #define AD5770R_CH_SELECT 0x34 60 #define AD5770R_CH_ENABLE 0x44 61 62 /* AD5770R_CHANNEL_CONFIG */ 63 #define AD5770R_CFG_CH0_SINK_EN(x) (((x) & 0x1) << 7) 64 #define AD5770R_CFG_SHUTDOWN_B(x, ch) (((x) & 0x1) << (ch)) 65 66 /* AD5770R_OUTPUT_RANGE */ 67 #define AD5770R_RANGE_OUTPUT_SCALING(x) (((x) & GENMASK(5, 0)) << 2) 68 #define AD5770R_RANGE_MODE(x) ((x) & GENMASK(1, 0)) 69 70 /* AD5770R_REFERENCE */ 71 #define AD5770R_REF_RESISTOR_SEL(x) (((x) & 0x1) << 2) 72 #define AD5770R_REF_SEL(x) ((x) & GENMASK(1, 0)) 73 74 /* AD5770R_CH_ENABLE */ 75 #define AD5770R_CH_SET(x, ch) (((x) & 0x1) << (ch)) 76 77 #define AD5770R_MAX_CHANNELS 6 78 #define AD5770R_MAX_CH_MODES 14 79 #define AD5770R_LOW_VREF_mV 1250 80 #define AD5770R_HIGH_VREF_mV 2500 81 82 enum ad5770r_ch0_modes { 83 AD5770R_CH0_0_300 = 0, 84 AD5770R_CH0_NEG_60_0, 85 AD5770R_CH0_NEG_60_300 86 }; 87 88 enum ad5770r_ch1_modes { 89 AD5770R_CH1_0_140_LOW_HEAD = 1, 90 AD5770R_CH1_0_140_LOW_NOISE, 91 AD5770R_CH1_0_250 92 }; 93 94 enum ad5770r_ch2_5_modes { 95 AD5770R_CH_LOW_RANGE = 0, 96 AD5770R_CH_HIGH_RANGE 97 }; 98 99 enum ad5770r_ref_v { 100 AD5770R_EXT_2_5_V = 0, 101 AD5770R_INT_1_25_V_OUT_ON, 102 AD5770R_EXT_1_25_V, 103 AD5770R_INT_1_25_V_OUT_OFF 104 }; 105 106 enum ad5770r_output_filter_resistor { 107 AD5770R_FILTER_60_OHM = 0x0, 108 AD5770R_FILTER_5_6_KOHM = 0x5, 109 AD5770R_FILTER_11_2_KOHM, 110 AD5770R_FILTER_22_2_KOHM, 111 AD5770R_FILTER_44_4_KOHM, 112 AD5770R_FILTER_104_KOHM, 113 }; 114 115 struct ad5770r_out_range { 116 u8 out_scale; 117 u8 out_range_mode; 118 }; 119 120 /** 121 * struct ad5770r_state - driver instance specific data 122 * @spi: spi_device 123 * @regmap: regmap 124 * @vref_reg: fixed regulator for reference configuration 125 * @gpio_reset: gpio descriptor 126 * @output_mode: array contains channels output ranges 127 * @vref: reference value 128 * @ch_pwr_down: powerdown flags 129 * @internal_ref: internal reference flag 130 * @external_res: external 2.5k resistor flag 131 * @transf_buf: cache aligned buffer for spi read/write 132 */ 133 struct ad5770r_state { 134 struct spi_device *spi; 135 struct regmap *regmap; 136 struct regulator *vref_reg; 137 struct gpio_desc *gpio_reset; 138 struct ad5770r_out_range output_mode[AD5770R_MAX_CHANNELS]; 139 int vref; 140 bool ch_pwr_down[AD5770R_MAX_CHANNELS]; 141 bool internal_ref; 142 bool external_res; 143 u8 transf_buf[2] __aligned(IIO_DMA_MINALIGN); 144 }; 145 146 static const struct regmap_config ad5770r_spi_regmap_config = { 147 .reg_bits = 8, 148 .val_bits = 8, 149 .read_flag_mask = BIT(7), 150 }; 151 152 struct ad5770r_output_modes { 153 unsigned int ch; 154 u8 mode; 155 int min; 156 int max; 157 }; 158 159 static struct ad5770r_output_modes ad5770r_rng_tbl[] = { 160 { 0, AD5770R_CH0_0_300, 0, 300 }, 161 { 0, AD5770R_CH0_NEG_60_0, -60, 0 }, 162 { 0, AD5770R_CH0_NEG_60_300, -60, 300 }, 163 { 1, AD5770R_CH1_0_140_LOW_HEAD, 0, 140 }, 164 { 1, AD5770R_CH1_0_140_LOW_NOISE, 0, 140 }, 165 { 1, AD5770R_CH1_0_250, 0, 250 }, 166 { 2, AD5770R_CH_LOW_RANGE, 0, 55 }, 167 { 2, AD5770R_CH_HIGH_RANGE, 0, 150 }, 168 { 3, AD5770R_CH_LOW_RANGE, 0, 45 }, 169 { 3, AD5770R_CH_HIGH_RANGE, 0, 100 }, 170 { 4, AD5770R_CH_LOW_RANGE, 0, 45 }, 171 { 4, AD5770R_CH_HIGH_RANGE, 0, 100 }, 172 { 5, AD5770R_CH_LOW_RANGE, 0, 45 }, 173 { 5, AD5770R_CH_HIGH_RANGE, 0, 100 }, 174 }; 175 176 static const unsigned int ad5770r_filter_freqs[] = { 177 153, 357, 715, 1400, 2800, 262000, 178 }; 179 180 static const unsigned int ad5770r_filter_reg_vals[] = { 181 AD5770R_FILTER_104_KOHM, 182 AD5770R_FILTER_44_4_KOHM, 183 AD5770R_FILTER_22_2_KOHM, 184 AD5770R_FILTER_11_2_KOHM, 185 AD5770R_FILTER_5_6_KOHM, 186 AD5770R_FILTER_60_OHM 187 }; 188 ad5770r_set_output_mode(struct ad5770r_state * st,const struct ad5770r_out_range * out_mode,int channel)189 static int ad5770r_set_output_mode(struct ad5770r_state *st, 190 const struct ad5770r_out_range *out_mode, 191 int channel) 192 { 193 unsigned int regval; 194 195 regval = AD5770R_RANGE_OUTPUT_SCALING(out_mode->out_scale) | 196 AD5770R_RANGE_MODE(out_mode->out_range_mode); 197 198 return regmap_write(st->regmap, 199 AD5770R_OUTPUT_RANGE(channel), regval); 200 } 201 ad5770r_set_reference(struct ad5770r_state * st)202 static int ad5770r_set_reference(struct ad5770r_state *st) 203 { 204 unsigned int regval; 205 206 regval = AD5770R_REF_RESISTOR_SEL(st->external_res); 207 208 if (st->internal_ref) { 209 regval |= AD5770R_REF_SEL(AD5770R_INT_1_25_V_OUT_OFF); 210 } else { 211 switch (st->vref) { 212 case AD5770R_LOW_VREF_mV: 213 regval |= AD5770R_REF_SEL(AD5770R_EXT_1_25_V); 214 break; 215 case AD5770R_HIGH_VREF_mV: 216 regval |= AD5770R_REF_SEL(AD5770R_EXT_2_5_V); 217 break; 218 default: 219 regval = AD5770R_REF_SEL(AD5770R_INT_1_25_V_OUT_OFF); 220 break; 221 } 222 } 223 224 return regmap_write(st->regmap, AD5770R_REFERENCE, regval); 225 } 226 ad5770r_soft_reset(struct ad5770r_state * st)227 static int ad5770r_soft_reset(struct ad5770r_state *st) 228 { 229 return regmap_write(st->regmap, ADI_SPI_IF_CONFIG_A, 230 ADI_SPI_IF_SW_RESET_SEL(1)); 231 } 232 ad5770r_reset(struct ad5770r_state * st)233 static int ad5770r_reset(struct ad5770r_state *st) 234 { 235 /* Perform software reset if no GPIO provided */ 236 if (!st->gpio_reset) 237 return ad5770r_soft_reset(st); 238 239 gpiod_set_value_cansleep(st->gpio_reset, 0); 240 usleep_range(10, 20); 241 gpiod_set_value_cansleep(st->gpio_reset, 1); 242 243 /* data must not be written during reset timeframe */ 244 usleep_range(100, 200); 245 246 return 0; 247 } 248 ad5770r_get_range(struct ad5770r_state * st,int ch,int * min,int * max)249 static int ad5770r_get_range(struct ad5770r_state *st, 250 int ch, int *min, int *max) 251 { 252 int i; 253 u8 tbl_ch, tbl_mode, out_range; 254 255 out_range = st->output_mode[ch].out_range_mode; 256 257 for (i = 0; i < AD5770R_MAX_CH_MODES; i++) { 258 tbl_ch = ad5770r_rng_tbl[i].ch; 259 tbl_mode = ad5770r_rng_tbl[i].mode; 260 if (tbl_ch == ch && tbl_mode == out_range) { 261 *min = ad5770r_rng_tbl[i].min; 262 *max = ad5770r_rng_tbl[i].max; 263 return 0; 264 } 265 } 266 267 return -EINVAL; 268 } 269 ad5770r_get_filter_freq(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,int * freq)270 static int ad5770r_get_filter_freq(struct iio_dev *indio_dev, 271 const struct iio_chan_spec *chan, int *freq) 272 { 273 struct ad5770r_state *st = iio_priv(indio_dev); 274 int ret; 275 unsigned int regval, i; 276 277 ret = regmap_read(st->regmap, 278 AD5770R_FILTER_RESISTOR(chan->channel), ®val); 279 if (ret < 0) 280 return ret; 281 282 for (i = 0; i < ARRAY_SIZE(ad5770r_filter_reg_vals); i++) 283 if (regval == ad5770r_filter_reg_vals[i]) 284 break; 285 if (i == ARRAY_SIZE(ad5770r_filter_reg_vals)) 286 return -EINVAL; 287 288 *freq = ad5770r_filter_freqs[i]; 289 290 return IIO_VAL_INT; 291 } 292 ad5770r_set_filter_freq(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,unsigned int freq)293 static int ad5770r_set_filter_freq(struct iio_dev *indio_dev, 294 const struct iio_chan_spec *chan, 295 unsigned int freq) 296 { 297 struct ad5770r_state *st = iio_priv(indio_dev); 298 unsigned int regval, i; 299 300 for (i = 0; i < ARRAY_SIZE(ad5770r_filter_freqs); i++) 301 if (ad5770r_filter_freqs[i] >= freq) 302 break; 303 if (i == ARRAY_SIZE(ad5770r_filter_freqs)) 304 return -EINVAL; 305 306 regval = ad5770r_filter_reg_vals[i]; 307 308 return regmap_write(st->regmap, AD5770R_FILTER_RESISTOR(chan->channel), 309 regval); 310 } 311 ad5770r_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long info)312 static int ad5770r_read_raw(struct iio_dev *indio_dev, 313 struct iio_chan_spec const *chan, 314 int *val, int *val2, long info) 315 { 316 struct ad5770r_state *st = iio_priv(indio_dev); 317 int max, min, ret; 318 u16 buf16; 319 320 switch (info) { 321 case IIO_CHAN_INFO_RAW: 322 ret = regmap_bulk_read(st->regmap, 323 chan->address, 324 st->transf_buf, 2); 325 if (ret) 326 return 0; 327 328 buf16 = st->transf_buf[0] + (st->transf_buf[1] << 8); 329 *val = buf16 >> 2; 330 return IIO_VAL_INT; 331 case IIO_CHAN_INFO_SCALE: 332 ret = ad5770r_get_range(st, chan->channel, &min, &max); 333 if (ret < 0) 334 return ret; 335 *val = max - min; 336 /* There is no sign bit. (negative current is mapped from 0) 337 * (sourced/sinked) current = raw * scale + offset 338 * where offset in case of CH0 can be negative. 339 */ 340 *val2 = 14; 341 return IIO_VAL_FRACTIONAL_LOG2; 342 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: 343 return ad5770r_get_filter_freq(indio_dev, chan, val); 344 case IIO_CHAN_INFO_OFFSET: 345 ret = ad5770r_get_range(st, chan->channel, &min, &max); 346 if (ret < 0) 347 return ret; 348 *val = min; 349 return IIO_VAL_INT; 350 default: 351 return -EINVAL; 352 } 353 } 354 ad5770r_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long info)355 static int ad5770r_write_raw(struct iio_dev *indio_dev, 356 struct iio_chan_spec const *chan, 357 int val, int val2, long info) 358 { 359 struct ad5770r_state *st = iio_priv(indio_dev); 360 361 switch (info) { 362 case IIO_CHAN_INFO_RAW: 363 st->transf_buf[0] = ((u16)val >> 6); 364 st->transf_buf[1] = (val & GENMASK(5, 0)) << 2; 365 return regmap_bulk_write(st->regmap, chan->address, 366 st->transf_buf, 2); 367 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: 368 return ad5770r_set_filter_freq(indio_dev, chan, val); 369 default: 370 return -EINVAL; 371 } 372 } 373 ad5770r_read_freq_avail(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,const int ** vals,int * type,int * length,long mask)374 static int ad5770r_read_freq_avail(struct iio_dev *indio_dev, 375 struct iio_chan_spec const *chan, 376 const int **vals, int *type, int *length, 377 long mask) 378 { 379 switch (mask) { 380 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: 381 *type = IIO_VAL_INT; 382 *vals = ad5770r_filter_freqs; 383 *length = ARRAY_SIZE(ad5770r_filter_freqs); 384 return IIO_AVAIL_LIST; 385 } 386 387 return -EINVAL; 388 } 389 ad5770r_reg_access(struct iio_dev * indio_dev,unsigned int reg,unsigned int writeval,unsigned int * readval)390 static int ad5770r_reg_access(struct iio_dev *indio_dev, 391 unsigned int reg, 392 unsigned int writeval, 393 unsigned int *readval) 394 { 395 struct ad5770r_state *st = iio_priv(indio_dev); 396 397 if (readval) 398 return regmap_read(st->regmap, reg, readval); 399 else 400 return regmap_write(st->regmap, reg, writeval); 401 } 402 403 static const struct iio_info ad5770r_info = { 404 .read_raw = ad5770r_read_raw, 405 .write_raw = ad5770r_write_raw, 406 .read_avail = ad5770r_read_freq_avail, 407 .debugfs_reg_access = &ad5770r_reg_access, 408 }; 409 ad5770r_store_output_range(struct ad5770r_state * st,int min,int max,int index)410 static int ad5770r_store_output_range(struct ad5770r_state *st, 411 int min, int max, int index) 412 { 413 int i; 414 415 for (i = 0; i < AD5770R_MAX_CH_MODES; i++) { 416 if (ad5770r_rng_tbl[i].ch != index) 417 continue; 418 if (ad5770r_rng_tbl[i].min != min || 419 ad5770r_rng_tbl[i].max != max) 420 continue; 421 st->output_mode[index].out_range_mode = ad5770r_rng_tbl[i].mode; 422 423 return 0; 424 } 425 426 return -EINVAL; 427 } 428 ad5770r_read_dac_powerdown(struct iio_dev * indio_dev,uintptr_t private,const struct iio_chan_spec * chan,char * buf)429 static ssize_t ad5770r_read_dac_powerdown(struct iio_dev *indio_dev, 430 uintptr_t private, 431 const struct iio_chan_spec *chan, 432 char *buf) 433 { 434 struct ad5770r_state *st = iio_priv(indio_dev); 435 436 return sysfs_emit(buf, "%d\n", st->ch_pwr_down[chan->channel]); 437 } 438 ad5770r_write_dac_powerdown(struct iio_dev * indio_dev,uintptr_t private,const struct iio_chan_spec * chan,const char * buf,size_t len)439 static ssize_t ad5770r_write_dac_powerdown(struct iio_dev *indio_dev, 440 uintptr_t private, 441 const struct iio_chan_spec *chan, 442 const char *buf, size_t len) 443 { 444 struct ad5770r_state *st = iio_priv(indio_dev); 445 unsigned int regval; 446 unsigned int mask; 447 bool readin; 448 int ret; 449 450 ret = kstrtobool(buf, &readin); 451 if (ret) 452 return ret; 453 454 readin = !readin; 455 456 regval = AD5770R_CFG_SHUTDOWN_B(readin, chan->channel); 457 if (chan->channel == 0 && 458 st->output_mode[0].out_range_mode > AD5770R_CH0_0_300) { 459 regval |= AD5770R_CFG_CH0_SINK_EN(readin); 460 mask = BIT(chan->channel) + BIT(7); 461 } else { 462 mask = BIT(chan->channel); 463 } 464 ret = regmap_update_bits(st->regmap, AD5770R_CHANNEL_CONFIG, mask, 465 regval); 466 if (ret) 467 return ret; 468 469 regval = AD5770R_CH_SET(readin, chan->channel); 470 ret = regmap_update_bits(st->regmap, AD5770R_CH_ENABLE, 471 BIT(chan->channel), regval); 472 if (ret) 473 return ret; 474 475 st->ch_pwr_down[chan->channel] = !readin; 476 477 return len; 478 } 479 480 static const struct iio_chan_spec_ext_info ad5770r_ext_info[] = { 481 { 482 .name = "powerdown", 483 .read = ad5770r_read_dac_powerdown, 484 .write = ad5770r_write_dac_powerdown, 485 .shared = IIO_SEPARATE, 486 }, 487 { } 488 }; 489 490 #define AD5770R_IDAC_CHANNEL(index, reg) { \ 491 .type = IIO_CURRENT, \ 492 .address = reg, \ 493 .indexed = 1, \ 494 .channel = index, \ 495 .output = 1, \ 496 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ 497 BIT(IIO_CHAN_INFO_SCALE) | \ 498 BIT(IIO_CHAN_INFO_OFFSET) | \ 499 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \ 500 .info_mask_shared_by_type_available = \ 501 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \ 502 .ext_info = ad5770r_ext_info, \ 503 } 504 505 static const struct iio_chan_spec ad5770r_channels[] = { 506 AD5770R_IDAC_CHANNEL(0, AD5770R_DAC_MSB(0)), 507 AD5770R_IDAC_CHANNEL(1, AD5770R_DAC_MSB(1)), 508 AD5770R_IDAC_CHANNEL(2, AD5770R_DAC_MSB(2)), 509 AD5770R_IDAC_CHANNEL(3, AD5770R_DAC_MSB(3)), 510 AD5770R_IDAC_CHANNEL(4, AD5770R_DAC_MSB(4)), 511 AD5770R_IDAC_CHANNEL(5, AD5770R_DAC_MSB(5)), 512 }; 513 ad5770r_channel_config(struct ad5770r_state * st)514 static int ad5770r_channel_config(struct ad5770r_state *st) 515 { 516 int ret, tmp[2], min, max; 517 unsigned int num; 518 struct fwnode_handle *child; 519 520 num = device_get_child_node_count(&st->spi->dev); 521 if (num != AD5770R_MAX_CHANNELS) 522 return -EINVAL; 523 524 device_for_each_child_node(&st->spi->dev, child) { 525 ret = fwnode_property_read_u32(child, "reg", &num); 526 if (ret) 527 goto err_child_out; 528 if (num >= AD5770R_MAX_CHANNELS) { 529 ret = -EINVAL; 530 goto err_child_out; 531 } 532 533 ret = fwnode_property_read_u32_array(child, 534 "adi,range-microamp", 535 tmp, 2); 536 if (ret) 537 goto err_child_out; 538 539 min = tmp[0] / 1000; 540 max = tmp[1] / 1000; 541 ret = ad5770r_store_output_range(st, min, max, num); 542 if (ret) 543 goto err_child_out; 544 } 545 546 return 0; 547 548 err_child_out: 549 fwnode_handle_put(child); 550 return ret; 551 } 552 ad5770r_init(struct ad5770r_state * st)553 static int ad5770r_init(struct ad5770r_state *st) 554 { 555 int ret, i; 556 557 st->gpio_reset = devm_gpiod_get_optional(&st->spi->dev, "reset", 558 GPIOD_OUT_HIGH); 559 if (IS_ERR(st->gpio_reset)) 560 return PTR_ERR(st->gpio_reset); 561 562 /* Perform a reset */ 563 ret = ad5770r_reset(st); 564 if (ret) 565 return ret; 566 567 /* Set output range */ 568 ret = ad5770r_channel_config(st); 569 if (ret) 570 return ret; 571 572 for (i = 0; i < AD5770R_MAX_CHANNELS; i++) { 573 ret = ad5770r_set_output_mode(st, &st->output_mode[i], i); 574 if (ret) 575 return ret; 576 } 577 578 st->external_res = fwnode_property_read_bool(st->spi->dev.fwnode, 579 "adi,external-resistor"); 580 581 ret = ad5770r_set_reference(st); 582 if (ret) 583 return ret; 584 585 /* Set outputs off */ 586 ret = regmap_write(st->regmap, AD5770R_CHANNEL_CONFIG, 0x00); 587 if (ret) 588 return ret; 589 590 ret = regmap_write(st->regmap, AD5770R_CH_ENABLE, 0x00); 591 if (ret) 592 return ret; 593 594 for (i = 0; i < AD5770R_MAX_CHANNELS; i++) 595 st->ch_pwr_down[i] = true; 596 597 return ret; 598 } 599 ad5770r_disable_regulator(void * data)600 static void ad5770r_disable_regulator(void *data) 601 { 602 struct ad5770r_state *st = data; 603 604 regulator_disable(st->vref_reg); 605 } 606 ad5770r_probe(struct spi_device * spi)607 static int ad5770r_probe(struct spi_device *spi) 608 { 609 struct ad5770r_state *st; 610 struct iio_dev *indio_dev; 611 struct regmap *regmap; 612 int ret; 613 614 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); 615 if (!indio_dev) 616 return -ENOMEM; 617 618 st = iio_priv(indio_dev); 619 spi_set_drvdata(spi, indio_dev); 620 621 st->spi = spi; 622 623 regmap = devm_regmap_init_spi(spi, &ad5770r_spi_regmap_config); 624 if (IS_ERR(regmap)) { 625 dev_err(&spi->dev, "Error initializing spi regmap: %ld\n", 626 PTR_ERR(regmap)); 627 return PTR_ERR(regmap); 628 } 629 st->regmap = regmap; 630 631 st->vref_reg = devm_regulator_get_optional(&spi->dev, "vref"); 632 if (!IS_ERR(st->vref_reg)) { 633 ret = regulator_enable(st->vref_reg); 634 if (ret) { 635 dev_err(&spi->dev, 636 "Failed to enable vref regulators: %d\n", ret); 637 return ret; 638 } 639 640 ret = devm_add_action_or_reset(&spi->dev, 641 ad5770r_disable_regulator, 642 st); 643 if (ret < 0) 644 return ret; 645 646 ret = regulator_get_voltage(st->vref_reg); 647 if (ret < 0) 648 return ret; 649 650 st->vref = ret / 1000; 651 } else { 652 if (PTR_ERR(st->vref_reg) == -ENODEV) { 653 st->vref = AD5770R_LOW_VREF_mV; 654 st->internal_ref = true; 655 } else { 656 return PTR_ERR(st->vref_reg); 657 } 658 } 659 660 indio_dev->name = spi_get_device_id(spi)->name; 661 indio_dev->info = &ad5770r_info; 662 indio_dev->modes = INDIO_DIRECT_MODE; 663 indio_dev->channels = ad5770r_channels; 664 indio_dev->num_channels = ARRAY_SIZE(ad5770r_channels); 665 666 ret = ad5770r_init(st); 667 if (ret < 0) { 668 dev_err(&spi->dev, "AD5770R init failed\n"); 669 return ret; 670 } 671 672 return devm_iio_device_register(&st->spi->dev, indio_dev); 673 } 674 675 static const struct of_device_id ad5770r_of_id[] = { 676 { .compatible = "adi,ad5770r", }, 677 {}, 678 }; 679 MODULE_DEVICE_TABLE(of, ad5770r_of_id); 680 681 static const struct spi_device_id ad5770r_id[] = { 682 { "ad5770r", 0 }, 683 {}, 684 }; 685 MODULE_DEVICE_TABLE(spi, ad5770r_id); 686 687 static struct spi_driver ad5770r_driver = { 688 .driver = { 689 .name = KBUILD_MODNAME, 690 .of_match_table = ad5770r_of_id, 691 }, 692 .probe = ad5770r_probe, 693 .id_table = ad5770r_id, 694 }; 695 696 module_spi_driver(ad5770r_driver); 697 698 MODULE_AUTHOR("Mircea Caprioru <mircea.caprioru@analog.com>"); 699 MODULE_DESCRIPTION("Analog Devices AD5770R IDAC"); 700 MODULE_LICENSE("GPL v2"); 701