Lars-Peter Clausen | af30084 | 2012-08-10 17:36:00 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Support code for Analog Devices Sigma-Delta ADCs |
| 3 | * |
| 4 | * Copyright 2012 Analog Devices Inc. |
| 5 | * Author: Lars-Peter Clausen <lars@metafoo.de> |
| 6 | * |
| 7 | * Licensed under the GPL-2. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/interrupt.h> |
| 11 | #include <linux/device.h> |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/slab.h> |
| 14 | #include <linux/spi/spi.h> |
| 15 | #include <linux/err.h> |
| 16 | #include <linux/module.h> |
| 17 | |
| 18 | #include <linux/iio/iio.h> |
| 19 | #include <linux/iio/sysfs.h> |
| 20 | #include <linux/iio/buffer.h> |
| 21 | #include <linux/iio/trigger.h> |
| 22 | #include <linux/iio/trigger_consumer.h> |
| 23 | #include <linux/iio/triggered_buffer.h> |
| 24 | #include <linux/iio/adc/ad_sigma_delta.h> |
| 25 | |
| 26 | #include <asm/unaligned.h> |
| 27 | |
| 28 | |
| 29 | #define AD_SD_COMM_CHAN_MASK 0x3 |
| 30 | |
| 31 | #define AD_SD_REG_COMM 0x00 |
| 32 | #define AD_SD_REG_DATA 0x03 |
| 33 | |
| 34 | /** |
| 35 | * ad_sd_set_comm() - Set communications register |
| 36 | * |
| 37 | * @sigma_delta: The sigma delta device |
| 38 | * @comm: New value for the communications register |
| 39 | */ |
| 40 | void ad_sd_set_comm(struct ad_sigma_delta *sigma_delta, uint8_t comm) |
| 41 | { |
| 42 | /* Some variants use the lower two bits of the communications register |
| 43 | * to select the channel */ |
| 44 | sigma_delta->comm = comm & AD_SD_COMM_CHAN_MASK; |
| 45 | } |
| 46 | EXPORT_SYMBOL_GPL(ad_sd_set_comm); |
| 47 | |
| 48 | /** |
| 49 | * ad_sd_write_reg() - Write a register |
| 50 | * |
| 51 | * @sigma_delta: The sigma delta device |
| 52 | * @reg: Address of the register |
| 53 | * @size: Size of the register (0-3) |
| 54 | * @val: Value to write to the register |
| 55 | * |
| 56 | * Returns 0 on success, an error code otherwise. |
| 57 | **/ |
| 58 | int ad_sd_write_reg(struct ad_sigma_delta *sigma_delta, unsigned int reg, |
| 59 | unsigned int size, unsigned int val) |
| 60 | { |
| 61 | uint8_t *data = sigma_delta->data; |
| 62 | struct spi_transfer t = { |
| 63 | .tx_buf = data, |
| 64 | .len = size + 1, |
| 65 | .cs_change = sigma_delta->bus_locked, |
| 66 | }; |
| 67 | struct spi_message m; |
| 68 | int ret; |
| 69 | |
| 70 | data[0] = (reg << sigma_delta->info->addr_shift) | sigma_delta->comm; |
| 71 | |
| 72 | switch (size) { |
| 73 | case 3: |
| 74 | data[1] = val >> 16; |
| 75 | data[2] = val >> 8; |
| 76 | data[3] = val; |
| 77 | break; |
| 78 | case 2: |
| 79 | put_unaligned_be16(val, &data[1]); |
| 80 | break; |
| 81 | case 1: |
| 82 | data[1] = val; |
| 83 | break; |
| 84 | case 0: |
| 85 | break; |
| 86 | default: |
| 87 | return -EINVAL; |
| 88 | } |
| 89 | |
| 90 | spi_message_init(&m); |
| 91 | spi_message_add_tail(&t, &m); |
| 92 | |
| 93 | if (sigma_delta->bus_locked) |
| 94 | ret = spi_sync_locked(sigma_delta->spi, &m); |
| 95 | else |
| 96 | ret = spi_sync(sigma_delta->spi, &m); |
| 97 | |
| 98 | return ret; |
| 99 | } |
| 100 | EXPORT_SYMBOL_GPL(ad_sd_write_reg); |
| 101 | |
| 102 | static int ad_sd_read_reg_raw(struct ad_sigma_delta *sigma_delta, |
| 103 | unsigned int reg, unsigned int size, uint8_t *val) |
| 104 | { |
| 105 | uint8_t *data = sigma_delta->data; |
| 106 | int ret; |
| 107 | struct spi_transfer t[] = { |
| 108 | { |
| 109 | .tx_buf = data, |
| 110 | .len = 1, |
| 111 | }, { |
| 112 | .rx_buf = val, |
| 113 | .len = size, |
| 114 | .cs_change = sigma_delta->bus_locked, |
| 115 | }, |
| 116 | }; |
| 117 | struct spi_message m; |
| 118 | |
| 119 | spi_message_init(&m); |
| 120 | |
| 121 | if (sigma_delta->info->has_registers) { |
| 122 | data[0] = reg << sigma_delta->info->addr_shift; |
| 123 | data[0] |= sigma_delta->info->read_mask; |
| 124 | spi_message_add_tail(&t[0], &m); |
| 125 | } |
| 126 | spi_message_add_tail(&t[1], &m); |
| 127 | |
| 128 | if (sigma_delta->bus_locked) |
| 129 | ret = spi_sync_locked(sigma_delta->spi, &m); |
| 130 | else |
| 131 | ret = spi_sync(sigma_delta->spi, &m); |
| 132 | |
| 133 | return ret; |
| 134 | } |
| 135 | |
| 136 | /** |
| 137 | * ad_sd_read_reg() - Read a register |
| 138 | * |
| 139 | * @sigma_delta: The sigma delta device |
| 140 | * @reg: Address of the register |
| 141 | * @size: Size of the register (1-4) |
| 142 | * @val: Read value |
| 143 | * |
| 144 | * Returns 0 on success, an error code otherwise. |
| 145 | **/ |
| 146 | int ad_sd_read_reg(struct ad_sigma_delta *sigma_delta, |
| 147 | unsigned int reg, unsigned int size, unsigned int *val) |
| 148 | { |
| 149 | int ret; |
| 150 | |
| 151 | ret = ad_sd_read_reg_raw(sigma_delta, reg, size, sigma_delta->data); |
| 152 | if (ret < 0) |
| 153 | goto out; |
| 154 | |
| 155 | switch (size) { |
| 156 | case 4: |
| 157 | *val = get_unaligned_be32(sigma_delta->data); |
| 158 | break; |
| 159 | case 3: |
| 160 | *val = (sigma_delta->data[0] << 16) | |
| 161 | (sigma_delta->data[1] << 8) | |
| 162 | sigma_delta->data[2]; |
| 163 | break; |
| 164 | case 2: |
| 165 | *val = get_unaligned_be16(sigma_delta->data); |
| 166 | break; |
| 167 | case 1: |
| 168 | *val = sigma_delta->data[0]; |
| 169 | break; |
| 170 | default: |
| 171 | ret = -EINVAL; |
| 172 | break; |
| 173 | } |
| 174 | |
| 175 | out: |
| 176 | return ret; |
| 177 | } |
| 178 | EXPORT_SYMBOL_GPL(ad_sd_read_reg); |
| 179 | |
| 180 | static int ad_sd_calibrate(struct ad_sigma_delta *sigma_delta, |
| 181 | unsigned int mode, unsigned int channel) |
| 182 | { |
| 183 | int ret; |
| 184 | |
| 185 | ret = ad_sigma_delta_set_channel(sigma_delta, channel); |
| 186 | if (ret) |
| 187 | return ret; |
| 188 | |
| 189 | spi_bus_lock(sigma_delta->spi->master); |
| 190 | sigma_delta->bus_locked = true; |
| 191 | INIT_COMPLETION(sigma_delta->completion); |
| 192 | |
| 193 | ret = ad_sigma_delta_set_mode(sigma_delta, mode); |
| 194 | if (ret < 0) |
| 195 | goto out; |
| 196 | |
| 197 | sigma_delta->irq_dis = false; |
| 198 | enable_irq(sigma_delta->spi->irq); |
| 199 | ret = wait_for_completion_timeout(&sigma_delta->completion, 2*HZ); |
| 200 | if (ret == 0) { |
| 201 | sigma_delta->irq_dis = true; |
| 202 | disable_irq_nosync(sigma_delta->spi->irq); |
| 203 | ret = -EIO; |
| 204 | } else { |
| 205 | ret = 0; |
| 206 | } |
| 207 | out: |
| 208 | sigma_delta->bus_locked = false; |
| 209 | spi_bus_unlock(sigma_delta->spi->master); |
| 210 | ad_sigma_delta_set_mode(sigma_delta, AD_SD_MODE_IDLE); |
| 211 | |
| 212 | return ret; |
| 213 | } |
| 214 | |
| 215 | /** |
| 216 | * ad_sd_calibrate_all() - Performs channel calibration |
| 217 | * @sigma_delta: The sigma delta device |
| 218 | * @cb: Array of channels and calibration type to perform |
| 219 | * @n: Number of items in cb |
| 220 | * |
| 221 | * Returns 0 on success, an error code otherwise. |
| 222 | **/ |
| 223 | int ad_sd_calibrate_all(struct ad_sigma_delta *sigma_delta, |
| 224 | const struct ad_sd_calib_data *cb, unsigned int n) |
| 225 | { |
| 226 | unsigned int i; |
| 227 | int ret; |
| 228 | |
| 229 | for (i = 0; i < n; i++) { |
| 230 | ret = ad_sd_calibrate(sigma_delta, cb[i].mode, cb[i].channel); |
| 231 | if (ret) |
| 232 | return ret; |
| 233 | } |
| 234 | |
| 235 | return 0; |
| 236 | } |
| 237 | EXPORT_SYMBOL_GPL(ad_sd_calibrate_all); |
| 238 | |
| 239 | /** |
| 240 | * ad_sigma_delta_single_conversion() - Performs a single data conversion |
| 241 | * @indio_dev: The IIO device |
| 242 | * @chan: The conversion is done for this channel |
| 243 | * @val: Pointer to the location where to store the read value |
| 244 | * |
| 245 | * Returns: 0 on success, an error value otherwise. |
| 246 | */ |
| 247 | int ad_sigma_delta_single_conversion(struct iio_dev *indio_dev, |
| 248 | const struct iio_chan_spec *chan, int *val) |
| 249 | { |
| 250 | struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev); |
| 251 | unsigned int sample, raw_sample; |
| 252 | int ret = 0; |
| 253 | |
| 254 | if (iio_buffer_enabled(indio_dev)) |
| 255 | return -EBUSY; |
| 256 | |
| 257 | mutex_lock(&indio_dev->mlock); |
| 258 | ad_sigma_delta_set_channel(sigma_delta, chan->address); |
| 259 | |
| 260 | spi_bus_lock(sigma_delta->spi->master); |
| 261 | sigma_delta->bus_locked = true; |
| 262 | INIT_COMPLETION(sigma_delta->completion); |
| 263 | |
| 264 | ad_sigma_delta_set_mode(sigma_delta, AD_SD_MODE_SINGLE); |
| 265 | |
| 266 | sigma_delta->irq_dis = false; |
| 267 | enable_irq(sigma_delta->spi->irq); |
| 268 | ret = wait_for_completion_interruptible_timeout( |
| 269 | &sigma_delta->completion, HZ); |
| 270 | |
| 271 | sigma_delta->bus_locked = false; |
| 272 | spi_bus_unlock(sigma_delta->spi->master); |
| 273 | |
| 274 | if (ret == 0) |
| 275 | ret = -EIO; |
| 276 | if (ret < 0) |
| 277 | goto out; |
| 278 | |
| 279 | ret = ad_sd_read_reg(sigma_delta, AD_SD_REG_DATA, |
| 280 | DIV_ROUND_UP(chan->scan_type.realbits + chan->scan_type.shift, 8), |
| 281 | &raw_sample); |
| 282 | |
| 283 | out: |
| 284 | if (!sigma_delta->irq_dis) { |
| 285 | disable_irq_nosync(sigma_delta->spi->irq); |
| 286 | sigma_delta->irq_dis = true; |
| 287 | } |
| 288 | |
| 289 | ad_sigma_delta_set_mode(sigma_delta, AD_SD_MODE_IDLE); |
| 290 | mutex_unlock(&indio_dev->mlock); |
| 291 | |
| 292 | if (ret) |
| 293 | return ret; |
| 294 | |
| 295 | sample = raw_sample >> chan->scan_type.shift; |
| 296 | sample &= (1 << chan->scan_type.realbits) - 1; |
| 297 | *val = sample; |
| 298 | |
| 299 | ret = ad_sigma_delta_postprocess_sample(sigma_delta, raw_sample); |
| 300 | if (ret) |
| 301 | return ret; |
| 302 | |
| 303 | return IIO_VAL_INT; |
| 304 | } |
| 305 | EXPORT_SYMBOL_GPL(ad_sigma_delta_single_conversion); |
| 306 | |
| 307 | static int ad_sd_buffer_postenable(struct iio_dev *indio_dev) |
| 308 | { |
| 309 | struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev); |
| 310 | unsigned int channel; |
| 311 | int ret; |
| 312 | |
| 313 | ret = iio_triggered_buffer_postenable(indio_dev); |
| 314 | if (ret < 0) |
| 315 | return ret; |
| 316 | |
| 317 | channel = find_first_bit(indio_dev->active_scan_mask, |
| 318 | indio_dev->masklength); |
| 319 | ret = ad_sigma_delta_set_channel(sigma_delta, |
| 320 | indio_dev->channels[channel].address); |
| 321 | if (ret) |
| 322 | goto err_predisable; |
| 323 | |
| 324 | spi_bus_lock(sigma_delta->spi->master); |
| 325 | sigma_delta->bus_locked = true; |
| 326 | ret = ad_sigma_delta_set_mode(sigma_delta, AD_SD_MODE_CONTINUOUS); |
| 327 | if (ret) |
| 328 | goto err_unlock; |
| 329 | |
| 330 | sigma_delta->irq_dis = false; |
| 331 | enable_irq(sigma_delta->spi->irq); |
| 332 | |
| 333 | return 0; |
| 334 | |
| 335 | err_unlock: |
| 336 | spi_bus_unlock(sigma_delta->spi->master); |
| 337 | err_predisable: |
| 338 | |
| 339 | return ret; |
| 340 | } |
| 341 | |
| 342 | static int ad_sd_buffer_postdisable(struct iio_dev *indio_dev) |
| 343 | { |
| 344 | struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev); |
| 345 | |
| 346 | INIT_COMPLETION(sigma_delta->completion); |
| 347 | wait_for_completion_timeout(&sigma_delta->completion, HZ); |
| 348 | |
| 349 | if (!sigma_delta->irq_dis) { |
| 350 | disable_irq_nosync(sigma_delta->spi->irq); |
| 351 | sigma_delta->irq_dis = true; |
| 352 | } |
| 353 | |
| 354 | ad_sigma_delta_set_mode(sigma_delta, AD_SD_MODE_IDLE); |
| 355 | |
| 356 | sigma_delta->bus_locked = false; |
| 357 | return spi_bus_unlock(sigma_delta->spi->master); |
| 358 | } |
| 359 | |
| 360 | static irqreturn_t ad_sd_trigger_handler(int irq, void *p) |
| 361 | { |
| 362 | struct iio_poll_func *pf = p; |
| 363 | struct iio_dev *indio_dev = pf->indio_dev; |
| 364 | struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev); |
| 365 | unsigned int reg_size; |
| 366 | uint8_t data[16]; |
| 367 | int ret; |
| 368 | |
| 369 | memset(data, 0x00, 16); |
| 370 | |
| 371 | /* Guaranteed to be aligned with 8 byte boundary */ |
| 372 | if (indio_dev->scan_timestamp) |
| 373 | ((s64 *)data)[1] = pf->timestamp; |
| 374 | |
| 375 | reg_size = indio_dev->channels[0].scan_type.realbits + |
| 376 | indio_dev->channels[0].scan_type.shift; |
| 377 | reg_size = DIV_ROUND_UP(reg_size, 8); |
| 378 | |
| 379 | switch (reg_size) { |
| 380 | case 4: |
| 381 | case 2: |
| 382 | case 1: |
| 383 | ret = ad_sd_read_reg_raw(sigma_delta, AD_SD_REG_DATA, |
| 384 | reg_size, &data[0]); |
| 385 | break; |
| 386 | case 3: |
| 387 | /* We store 24 bit samples in a 32 bit word. Keep the upper |
| 388 | * byte set to zero. */ |
| 389 | ret = ad_sd_read_reg_raw(sigma_delta, AD_SD_REG_DATA, |
| 390 | reg_size, &data[1]); |
| 391 | break; |
| 392 | } |
| 393 | |
Jonathan Cameron | 84b36ce | 2012-06-30 20:06:00 +0100 | [diff] [blame] | 394 | iio_push_to_buffers(indio_dev, (uint8_t *)data); |
Lars-Peter Clausen | af30084 | 2012-08-10 17:36:00 +0100 | [diff] [blame] | 395 | |
| 396 | iio_trigger_notify_done(indio_dev->trig); |
| 397 | sigma_delta->irq_dis = false; |
| 398 | enable_irq(sigma_delta->spi->irq); |
| 399 | |
| 400 | return IRQ_HANDLED; |
| 401 | } |
| 402 | |
| 403 | static const struct iio_buffer_setup_ops ad_sd_buffer_setup_ops = { |
| 404 | .preenable = &iio_sw_buffer_preenable, |
| 405 | .postenable = &ad_sd_buffer_postenable, |
| 406 | .predisable = &iio_triggered_buffer_predisable, |
| 407 | .postdisable = &ad_sd_buffer_postdisable, |
| 408 | .validate_scan_mask = &iio_validate_scan_mask_onehot, |
| 409 | }; |
| 410 | |
| 411 | static irqreturn_t ad_sd_data_rdy_trig_poll(int irq, void *private) |
| 412 | { |
| 413 | struct ad_sigma_delta *sigma_delta = private; |
| 414 | |
| 415 | complete(&sigma_delta->completion); |
| 416 | disable_irq_nosync(irq); |
| 417 | sigma_delta->irq_dis = true; |
| 418 | iio_trigger_poll(sigma_delta->trig, iio_get_time_ns()); |
| 419 | |
| 420 | return IRQ_HANDLED; |
| 421 | } |
| 422 | |
| 423 | /** |
| 424 | * ad_sd_validate_trigger() - validate_trigger callback for ad_sigma_delta devices |
| 425 | * @indio_dev: The IIO device |
| 426 | * @trig: The new trigger |
| 427 | * |
| 428 | * Returns: 0 if the 'trig' matches the trigger registered by the ad_sigma_delta |
| 429 | * device, -EINVAL otherwise. |
| 430 | */ |
| 431 | int ad_sd_validate_trigger(struct iio_dev *indio_dev, struct iio_trigger *trig) |
| 432 | { |
| 433 | struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev); |
| 434 | |
| 435 | if (sigma_delta->trig != trig) |
| 436 | return -EINVAL; |
| 437 | |
| 438 | return 0; |
| 439 | } |
| 440 | EXPORT_SYMBOL_GPL(ad_sd_validate_trigger); |
| 441 | |
| 442 | static const struct iio_trigger_ops ad_sd_trigger_ops = { |
| 443 | .owner = THIS_MODULE, |
| 444 | }; |
| 445 | |
| 446 | static int ad_sd_probe_trigger(struct iio_dev *indio_dev) |
| 447 | { |
| 448 | struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev); |
| 449 | int ret; |
| 450 | |
| 451 | sigma_delta->trig = iio_trigger_alloc("%s-dev%d", indio_dev->name, |
| 452 | indio_dev->id); |
| 453 | if (sigma_delta->trig == NULL) { |
| 454 | ret = -ENOMEM; |
| 455 | goto error_ret; |
| 456 | } |
| 457 | sigma_delta->trig->ops = &ad_sd_trigger_ops; |
| 458 | init_completion(&sigma_delta->completion); |
| 459 | |
| 460 | ret = request_irq(sigma_delta->spi->irq, |
| 461 | ad_sd_data_rdy_trig_poll, |
| 462 | IRQF_TRIGGER_LOW, |
| 463 | indio_dev->name, |
| 464 | sigma_delta); |
| 465 | if (ret) |
| 466 | goto error_free_trig; |
| 467 | |
| 468 | if (!sigma_delta->irq_dis) { |
| 469 | sigma_delta->irq_dis = true; |
| 470 | disable_irq_nosync(sigma_delta->spi->irq); |
| 471 | } |
| 472 | sigma_delta->trig->dev.parent = &sigma_delta->spi->dev; |
Lars-Peter Clausen | 1e9663c | 2013-03-25 08:58:00 +0000 | [diff] [blame] | 473 | iio_trigger_set_drvdata(sigma_delta->trig, sigma_delta); |
Lars-Peter Clausen | af30084 | 2012-08-10 17:36:00 +0100 | [diff] [blame] | 474 | |
| 475 | ret = iio_trigger_register(sigma_delta->trig); |
| 476 | if (ret) |
| 477 | goto error_free_irq; |
| 478 | |
| 479 | /* select default trigger */ |
| 480 | indio_dev->trig = sigma_delta->trig; |
| 481 | |
| 482 | return 0; |
| 483 | |
| 484 | error_free_irq: |
| 485 | free_irq(sigma_delta->spi->irq, sigma_delta); |
| 486 | error_free_trig: |
| 487 | iio_trigger_free(sigma_delta->trig); |
| 488 | error_ret: |
| 489 | return ret; |
| 490 | } |
| 491 | |
| 492 | static void ad_sd_remove_trigger(struct iio_dev *indio_dev) |
| 493 | { |
| 494 | struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev); |
| 495 | |
| 496 | iio_trigger_unregister(sigma_delta->trig); |
| 497 | free_irq(sigma_delta->spi->irq, sigma_delta); |
| 498 | iio_trigger_free(sigma_delta->trig); |
| 499 | } |
| 500 | |
| 501 | /** |
| 502 | * ad_sd_setup_buffer_and_trigger() - |
| 503 | * @indio_dev: The IIO device |
| 504 | */ |
| 505 | int ad_sd_setup_buffer_and_trigger(struct iio_dev *indio_dev) |
| 506 | { |
| 507 | int ret; |
| 508 | |
| 509 | ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, |
| 510 | &ad_sd_trigger_handler, &ad_sd_buffer_setup_ops); |
| 511 | if (ret) |
| 512 | return ret; |
| 513 | |
| 514 | ret = ad_sd_probe_trigger(indio_dev); |
| 515 | if (ret) { |
| 516 | iio_triggered_buffer_cleanup(indio_dev); |
| 517 | return ret; |
| 518 | } |
| 519 | |
| 520 | return 0; |
| 521 | } |
| 522 | EXPORT_SYMBOL_GPL(ad_sd_setup_buffer_and_trigger); |
| 523 | |
| 524 | /** |
| 525 | * ad_sd_cleanup_buffer_and_trigger() - |
| 526 | * @indio_dev: The IIO device |
| 527 | */ |
| 528 | void ad_sd_cleanup_buffer_and_trigger(struct iio_dev *indio_dev) |
| 529 | { |
| 530 | ad_sd_remove_trigger(indio_dev); |
| 531 | iio_triggered_buffer_cleanup(indio_dev); |
| 532 | } |
| 533 | EXPORT_SYMBOL_GPL(ad_sd_cleanup_buffer_and_trigger); |
| 534 | |
| 535 | /** |
| 536 | * ad_sd_init() - Initializes a ad_sigma_delta struct |
| 537 | * @sigma_delta: The ad_sigma_delta device |
| 538 | * @indio_dev: The IIO device which the Sigma Delta device is used for |
| 539 | * @spi: The SPI device for the ad_sigma_delta device |
| 540 | * @info: Device specific callbacks and options |
| 541 | * |
| 542 | * This function needs to be called before any other operations are performed on |
| 543 | * the ad_sigma_delta struct. |
| 544 | */ |
| 545 | int ad_sd_init(struct ad_sigma_delta *sigma_delta, struct iio_dev *indio_dev, |
| 546 | struct spi_device *spi, const struct ad_sigma_delta_info *info) |
| 547 | { |
| 548 | sigma_delta->spi = spi; |
| 549 | sigma_delta->info = info; |
| 550 | iio_device_set_drvdata(indio_dev, sigma_delta); |
| 551 | |
| 552 | return 0; |
| 553 | } |
| 554 | EXPORT_SYMBOL_GPL(ad_sd_init); |
| 555 | |
| 556 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); |
| 557 | MODULE_DESCRIPTION("Analog Devices Sigma-Delta ADCs"); |
| 558 | MODULE_LICENSE("GPL v2"); |