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Thomas Gleixnerfda8d262019-05-28 09:57:06 -07001// SPDX-License-Identifier: GPL-2.0-only
Lars-Peter Clausenaf300842012-08-10 17:36:00 +01002/*
3 * Support code for Analog Devices Sigma-Delta ADCs
4 *
5 * Copyright 2012 Analog Devices Inc.
6 * Author: Lars-Peter Clausen <lars@metafoo.de>
Lars-Peter Clausenaf300842012-08-10 17:36:00 +01007 */
8
9#include <linux/interrupt.h>
10#include <linux/device.h>
11#include <linux/kernel.h>
12#include <linux/slab.h>
13#include <linux/spi/spi.h>
14#include <linux/err.h>
15#include <linux/module.h>
16
17#include <linux/iio/iio.h>
18#include <linux/iio/sysfs.h>
19#include <linux/iio/buffer.h>
20#include <linux/iio/trigger.h>
21#include <linux/iio/trigger_consumer.h>
22#include <linux/iio/triggered_buffer.h>
23#include <linux/iio/adc/ad_sigma_delta.h>
24
25#include <asm/unaligned.h>
26
27
28#define AD_SD_COMM_CHAN_MASK 0x3
29
30#define AD_SD_REG_COMM 0x00
31#define AD_SD_REG_DATA 0x03
32
33/**
34 * ad_sd_set_comm() - Set communications register
35 *
36 * @sigma_delta: The sigma delta device
37 * @comm: New value for the communications register
38 */
39void ad_sd_set_comm(struct ad_sigma_delta *sigma_delta, uint8_t comm)
40{
41 /* Some variants use the lower two bits of the communications register
42 * to select the channel */
43 sigma_delta->comm = comm & AD_SD_COMM_CHAN_MASK;
44}
45EXPORT_SYMBOL_GPL(ad_sd_set_comm);
46
47/**
48 * ad_sd_write_reg() - Write a register
49 *
50 * @sigma_delta: The sigma delta device
51 * @reg: Address of the register
52 * @size: Size of the register (0-3)
53 * @val: Value to write to the register
54 *
55 * Returns 0 on success, an error code otherwise.
56 **/
57int ad_sd_write_reg(struct ad_sigma_delta *sigma_delta, unsigned int reg,
58 unsigned int size, unsigned int val)
59{
60 uint8_t *data = sigma_delta->data;
61 struct spi_transfer t = {
62 .tx_buf = data,
63 .len = size + 1,
Lars-Peter Clausendf1d80ae2019-03-19 13:37:55 +020064 .cs_change = sigma_delta->keep_cs_asserted,
Lars-Peter Clausenaf300842012-08-10 17:36:00 +010065 };
66 struct spi_message m;
67 int ret;
68
69 data[0] = (reg << sigma_delta->info->addr_shift) | sigma_delta->comm;
70
71 switch (size) {
72 case 3:
73 data[1] = val >> 16;
74 data[2] = val >> 8;
75 data[3] = val;
76 break;
77 case 2:
78 put_unaligned_be16(val, &data[1]);
79 break;
80 case 1:
81 data[1] = val;
82 break;
83 case 0:
84 break;
85 default:
86 return -EINVAL;
87 }
88
89 spi_message_init(&m);
90 spi_message_add_tail(&t, &m);
91
92 if (sigma_delta->bus_locked)
93 ret = spi_sync_locked(sigma_delta->spi, &m);
94 else
95 ret = spi_sync(sigma_delta->spi, &m);
96
97 return ret;
98}
99EXPORT_SYMBOL_GPL(ad_sd_write_reg);
100
101static int ad_sd_read_reg_raw(struct ad_sigma_delta *sigma_delta,
102 unsigned int reg, unsigned int size, uint8_t *val)
103{
104 uint8_t *data = sigma_delta->data;
105 int ret;
106 struct spi_transfer t[] = {
107 {
108 .tx_buf = data,
109 .len = 1,
110 }, {
111 .rx_buf = val,
112 .len = size,
113 .cs_change = sigma_delta->bus_locked,
114 },
115 };
116 struct spi_message m;
117
118 spi_message_init(&m);
119
120 if (sigma_delta->info->has_registers) {
121 data[0] = reg << sigma_delta->info->addr_shift;
122 data[0] |= sigma_delta->info->read_mask;
Dragos Bogdanfccfb9c2019-03-19 12:47:00 +0200123 data[0] |= sigma_delta->comm;
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100124 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 **/
146int 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
175out:
176 return ret;
177}
178EXPORT_SYMBOL_GPL(ad_sd_read_reg);
179
Dragos Bogdan7fc10de2017-09-05 15:14:45 +0300180/**
181 * ad_sd_reset() - Reset the serial interface
182 *
183 * @sigma_delta: The sigma delta device
184 * @reset_length: Number of SCLKs with DIN = 1
185 *
186 * Returns 0 on success, an error code otherwise.
187 **/
188int ad_sd_reset(struct ad_sigma_delta *sigma_delta,
189 unsigned int reset_length)
190{
191 uint8_t *buf;
192 unsigned int size;
193 int ret;
194
195 size = DIV_ROUND_UP(reset_length, 8);
196 buf = kcalloc(size, sizeof(*buf), GFP_KERNEL);
197 if (!buf)
198 return -ENOMEM;
199
200 memset(buf, 0xff, size);
201 ret = spi_write(sigma_delta->spi, buf, size);
202 kfree(buf);
203
204 return ret;
205}
206EXPORT_SYMBOL_GPL(ad_sd_reset);
207
Mircea Caprioruc88c8cd82019-09-02 16:08:29 +0300208int ad_sd_calibrate(struct ad_sigma_delta *sigma_delta,
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100209 unsigned int mode, unsigned int channel)
210{
211 int ret;
Nicholas Mc Guirecebc4582018-07-23 11:18:38 +0200212 unsigned long timeout;
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100213
214 ret = ad_sigma_delta_set_channel(sigma_delta, channel);
215 if (ret)
216 return ret;
217
218 spi_bus_lock(sigma_delta->spi->master);
219 sigma_delta->bus_locked = true;
Lars-Peter Clausendf1d80ae2019-03-19 13:37:55 +0200220 sigma_delta->keep_cs_asserted = true;
Wolfram Sang16735d02013-11-14 14:32:02 -0800221 reinit_completion(&sigma_delta->completion);
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100222
223 ret = ad_sigma_delta_set_mode(sigma_delta, mode);
224 if (ret < 0)
225 goto out;
226
227 sigma_delta->irq_dis = false;
228 enable_irq(sigma_delta->spi->irq);
Nicholas Mc Guirecebc4582018-07-23 11:18:38 +0200229 timeout = wait_for_completion_timeout(&sigma_delta->completion, 2 * HZ);
230 if (timeout == 0) {
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100231 sigma_delta->irq_dis = true;
232 disable_irq_nosync(sigma_delta->spi->irq);
233 ret = -EIO;
234 } else {
235 ret = 0;
236 }
237out:
Lars-Peter Clausendf1d80ae2019-03-19 13:37:55 +0200238 sigma_delta->keep_cs_asserted = false;
239 ad_sigma_delta_set_mode(sigma_delta, AD_SD_MODE_IDLE);
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100240 sigma_delta->bus_locked = false;
241 spi_bus_unlock(sigma_delta->spi->master);
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100242
243 return ret;
244}
Mircea Caprioruc88c8cd82019-09-02 16:08:29 +0300245EXPORT_SYMBOL_GPL(ad_sd_calibrate);
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100246
247/**
248 * ad_sd_calibrate_all() - Performs channel calibration
249 * @sigma_delta: The sigma delta device
250 * @cb: Array of channels and calibration type to perform
251 * @n: Number of items in cb
252 *
253 * Returns 0 on success, an error code otherwise.
254 **/
255int ad_sd_calibrate_all(struct ad_sigma_delta *sigma_delta,
256 const struct ad_sd_calib_data *cb, unsigned int n)
257{
258 unsigned int i;
259 int ret;
260
261 for (i = 0; i < n; i++) {
262 ret = ad_sd_calibrate(sigma_delta, cb[i].mode, cb[i].channel);
263 if (ret)
264 return ret;
265 }
266
267 return 0;
268}
269EXPORT_SYMBOL_GPL(ad_sd_calibrate_all);
270
271/**
272 * ad_sigma_delta_single_conversion() - Performs a single data conversion
273 * @indio_dev: The IIO device
274 * @chan: The conversion is done for this channel
275 * @val: Pointer to the location where to store the read value
276 *
277 * Returns: 0 on success, an error value otherwise.
278 */
279int ad_sigma_delta_single_conversion(struct iio_dev *indio_dev,
280 const struct iio_chan_spec *chan, int *val)
281{
282 struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev);
283 unsigned int sample, raw_sample;
Lars-Peter Clausenf0aef2d2018-11-13 13:20:24 +0200284 unsigned int data_reg;
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100285 int ret = 0;
286
287 if (iio_buffer_enabled(indio_dev))
288 return -EBUSY;
289
290 mutex_lock(&indio_dev->mlock);
291 ad_sigma_delta_set_channel(sigma_delta, chan->address);
292
293 spi_bus_lock(sigma_delta->spi->master);
294 sigma_delta->bus_locked = true;
Lars-Peter Clausendf1d80ae2019-03-19 13:37:55 +0200295 sigma_delta->keep_cs_asserted = true;
Wolfram Sang16735d02013-11-14 14:32:02 -0800296 reinit_completion(&sigma_delta->completion);
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100297
298 ad_sigma_delta_set_mode(sigma_delta, AD_SD_MODE_SINGLE);
299
300 sigma_delta->irq_dis = false;
301 enable_irq(sigma_delta->spi->irq);
302 ret = wait_for_completion_interruptible_timeout(
303 &sigma_delta->completion, HZ);
304
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100305 if (ret == 0)
306 ret = -EIO;
307 if (ret < 0)
308 goto out;
309
Lars-Peter Clausenf0aef2d2018-11-13 13:20:24 +0200310 if (sigma_delta->info->data_reg != 0)
311 data_reg = sigma_delta->info->data_reg;
312 else
313 data_reg = AD_SD_REG_DATA;
314
315 ret = ad_sd_read_reg(sigma_delta, data_reg,
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100316 DIV_ROUND_UP(chan->scan_type.realbits + chan->scan_type.shift, 8),
317 &raw_sample);
318
319out:
320 if (!sigma_delta->irq_dis) {
321 disable_irq_nosync(sigma_delta->spi->irq);
322 sigma_delta->irq_dis = true;
323 }
324
Lars-Peter Clausendf1d80ae2019-03-19 13:37:55 +0200325 sigma_delta->keep_cs_asserted = false;
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100326 ad_sigma_delta_set_mode(sigma_delta, AD_SD_MODE_IDLE);
Lars-Peter Clausendf1d80ae2019-03-19 13:37:55 +0200327 sigma_delta->bus_locked = false;
328 spi_bus_unlock(sigma_delta->spi->master);
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100329 mutex_unlock(&indio_dev->mlock);
330
331 if (ret)
332 return ret;
333
334 sample = raw_sample >> chan->scan_type.shift;
335 sample &= (1 << chan->scan_type.realbits) - 1;
336 *val = sample;
337
338 ret = ad_sigma_delta_postprocess_sample(sigma_delta, raw_sample);
339 if (ret)
340 return ret;
341
342 return IIO_VAL_INT;
343}
344EXPORT_SYMBOL_GPL(ad_sigma_delta_single_conversion);
345
346static int ad_sd_buffer_postenable(struct iio_dev *indio_dev)
347{
348 struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev);
349 unsigned int channel;
350 int ret;
351
352 ret = iio_triggered_buffer_postenable(indio_dev);
353 if (ret < 0)
354 return ret;
355
356 channel = find_first_bit(indio_dev->active_scan_mask,
357 indio_dev->masklength);
358 ret = ad_sigma_delta_set_channel(sigma_delta,
359 indio_dev->channels[channel].address);
360 if (ret)
Alexandru Ardelean387c1d72019-05-30 10:25:41 +0300361 return ret;
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100362
363 spi_bus_lock(sigma_delta->spi->master);
364 sigma_delta->bus_locked = true;
Lars-Peter Clausendf1d80ae2019-03-19 13:37:55 +0200365 sigma_delta->keep_cs_asserted = true;
366
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100367 ret = ad_sigma_delta_set_mode(sigma_delta, AD_SD_MODE_CONTINUOUS);
368 if (ret)
369 goto err_unlock;
370
371 sigma_delta->irq_dis = false;
372 enable_irq(sigma_delta->spi->irq);
373
374 return 0;
375
376err_unlock:
377 spi_bus_unlock(sigma_delta->spi->master);
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100378
379 return ret;
380}
381
382static int ad_sd_buffer_postdisable(struct iio_dev *indio_dev)
383{
384 struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev);
385
Wolfram Sang16735d02013-11-14 14:32:02 -0800386 reinit_completion(&sigma_delta->completion);
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100387 wait_for_completion_timeout(&sigma_delta->completion, HZ);
388
389 if (!sigma_delta->irq_dis) {
390 disable_irq_nosync(sigma_delta->spi->irq);
391 sigma_delta->irq_dis = true;
392 }
393
Lars-Peter Clausendf1d80ae2019-03-19 13:37:55 +0200394 sigma_delta->keep_cs_asserted = false;
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100395 ad_sigma_delta_set_mode(sigma_delta, AD_SD_MODE_IDLE);
396
397 sigma_delta->bus_locked = false;
398 return spi_bus_unlock(sigma_delta->spi->master);
399}
400
401static irqreturn_t ad_sd_trigger_handler(int irq, void *p)
402{
403 struct iio_poll_func *pf = p;
404 struct iio_dev *indio_dev = pf->indio_dev;
405 struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev);
406 unsigned int reg_size;
Lars-Peter Clausenf0aef2d2018-11-13 13:20:24 +0200407 unsigned int data_reg;
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100408 uint8_t data[16];
409 int ret;
410
411 memset(data, 0x00, 16);
412
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100413 reg_size = indio_dev->channels[0].scan_type.realbits +
414 indio_dev->channels[0].scan_type.shift;
415 reg_size = DIV_ROUND_UP(reg_size, 8);
416
Lars-Peter Clausenf0aef2d2018-11-13 13:20:24 +0200417 if (sigma_delta->info->data_reg != 0)
418 data_reg = sigma_delta->info->data_reg;
419 else
420 data_reg = AD_SD_REG_DATA;
421
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100422 switch (reg_size) {
423 case 4:
424 case 2:
425 case 1:
Lars-Peter Clausenf0aef2d2018-11-13 13:20:24 +0200426 ret = ad_sd_read_reg_raw(sigma_delta, data_reg, reg_size,
427 &data[0]);
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100428 break;
429 case 3:
430 /* We store 24 bit samples in a 32 bit word. Keep the upper
431 * byte set to zero. */
Lars-Peter Clausenf0aef2d2018-11-13 13:20:24 +0200432 ret = ad_sd_read_reg_raw(sigma_delta, data_reg, reg_size,
433 &data[1]);
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100434 break;
435 }
436
Lars-Peter Clausena1be5052013-09-19 13:59:00 +0100437 iio_push_to_buffers_with_timestamp(indio_dev, data, pf->timestamp);
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100438
439 iio_trigger_notify_done(indio_dev->trig);
440 sigma_delta->irq_dis = false;
441 enable_irq(sigma_delta->spi->irq);
442
443 return IRQ_HANDLED;
444}
445
446static const struct iio_buffer_setup_ops ad_sd_buffer_setup_ops = {
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100447 .postenable = &ad_sd_buffer_postenable,
448 .predisable = &iio_triggered_buffer_predisable,
449 .postdisable = &ad_sd_buffer_postdisable,
450 .validate_scan_mask = &iio_validate_scan_mask_onehot,
451};
452
453static irqreturn_t ad_sd_data_rdy_trig_poll(int irq, void *private)
454{
455 struct ad_sigma_delta *sigma_delta = private;
456
457 complete(&sigma_delta->completion);
458 disable_irq_nosync(irq);
459 sigma_delta->irq_dis = true;
Peter Meerwald398fd222014-12-06 06:46:00 +0000460 iio_trigger_poll(sigma_delta->trig);
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100461
462 return IRQ_HANDLED;
463}
464
465/**
466 * ad_sd_validate_trigger() - validate_trigger callback for ad_sigma_delta devices
467 * @indio_dev: The IIO device
468 * @trig: The new trigger
469 *
470 * Returns: 0 if the 'trig' matches the trigger registered by the ad_sigma_delta
471 * device, -EINVAL otherwise.
472 */
473int ad_sd_validate_trigger(struct iio_dev *indio_dev, struct iio_trigger *trig)
474{
475 struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev);
476
477 if (sigma_delta->trig != trig)
478 return -EINVAL;
479
480 return 0;
481}
482EXPORT_SYMBOL_GPL(ad_sd_validate_trigger);
483
484static const struct iio_trigger_ops ad_sd_trigger_ops = {
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100485};
486
487static int ad_sd_probe_trigger(struct iio_dev *indio_dev)
488{
489 struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev);
490 int ret;
491
492 sigma_delta->trig = iio_trigger_alloc("%s-dev%d", indio_dev->name,
493 indio_dev->id);
494 if (sigma_delta->trig == NULL) {
495 ret = -ENOMEM;
496 goto error_ret;
497 }
498 sigma_delta->trig->ops = &ad_sd_trigger_ops;
499 init_completion(&sigma_delta->completion);
500
501 ret = request_irq(sigma_delta->spi->irq,
502 ad_sd_data_rdy_trig_poll,
Alexandru Tachicida4d3d62020-01-13 12:26:52 +0200503 sigma_delta->info->irq_flags,
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100504 indio_dev->name,
505 sigma_delta);
506 if (ret)
507 goto error_free_trig;
508
509 if (!sigma_delta->irq_dis) {
510 sigma_delta->irq_dis = true;
511 disable_irq_nosync(sigma_delta->spi->irq);
512 }
513 sigma_delta->trig->dev.parent = &sigma_delta->spi->dev;
Lars-Peter Clausen1e9663c2013-03-25 08:58:00 +0000514 iio_trigger_set_drvdata(sigma_delta->trig, sigma_delta);
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100515
516 ret = iio_trigger_register(sigma_delta->trig);
517 if (ret)
518 goto error_free_irq;
519
520 /* select default trigger */
Srinivas Pandruvada9e5846b2014-08-22 21:48:00 +0100521 indio_dev->trig = iio_trigger_get(sigma_delta->trig);
Lars-Peter Clausenaf300842012-08-10 17:36:00 +0100522
523 return 0;
524
525error_free_irq:
526 free_irq(sigma_delta->spi->irq, sigma_delta);
527error_free_trig:
528 iio_trigger_free(sigma_delta->trig);
529error_ret:
530 return ret;
531}
532
533static void ad_sd_remove_trigger(struct iio_dev *indio_dev)
534{
535 struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev);
536
537 iio_trigger_unregister(sigma_delta->trig);
538 free_irq(sigma_delta->spi->irq, sigma_delta);
539 iio_trigger_free(sigma_delta->trig);
540}
541
542/**
543 * ad_sd_setup_buffer_and_trigger() -
544 * @indio_dev: The IIO device
545 */
546int ad_sd_setup_buffer_and_trigger(struct iio_dev *indio_dev)
547{
548 int ret;
549
550 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
551 &ad_sd_trigger_handler, &ad_sd_buffer_setup_ops);
552 if (ret)
553 return ret;
554
555 ret = ad_sd_probe_trigger(indio_dev);
556 if (ret) {
557 iio_triggered_buffer_cleanup(indio_dev);
558 return ret;
559 }
560
561 return 0;
562}
563EXPORT_SYMBOL_GPL(ad_sd_setup_buffer_and_trigger);
564
565/**
566 * ad_sd_cleanup_buffer_and_trigger() -
567 * @indio_dev: The IIO device
568 */
569void ad_sd_cleanup_buffer_and_trigger(struct iio_dev *indio_dev)
570{
571 ad_sd_remove_trigger(indio_dev);
572 iio_triggered_buffer_cleanup(indio_dev);
573}
574EXPORT_SYMBOL_GPL(ad_sd_cleanup_buffer_and_trigger);
575
576/**
577 * ad_sd_init() - Initializes a ad_sigma_delta struct
578 * @sigma_delta: The ad_sigma_delta device
579 * @indio_dev: The IIO device which the Sigma Delta device is used for
580 * @spi: The SPI device for the ad_sigma_delta device
581 * @info: Device specific callbacks and options
582 *
583 * This function needs to be called before any other operations are performed on
584 * the ad_sigma_delta struct.
585 */
586int ad_sd_init(struct ad_sigma_delta *sigma_delta, struct iio_dev *indio_dev,
587 struct spi_device *spi, const struct ad_sigma_delta_info *info)
588{
589 sigma_delta->spi = spi;
590 sigma_delta->info = info;
591 iio_device_set_drvdata(indio_dev, sigma_delta);
592
593 return 0;
594}
595EXPORT_SYMBOL_GPL(ad_sd_init);
596
597MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
598MODULE_DESCRIPTION("Analog Devices Sigma-Delta ADCs");
599MODULE_LICENSE("GPL v2");