1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Analog Devices AD4080 SPI ADC driver
4 *
5 * Copyright 2025 Analog Devices Inc.
6 */
7
8#include <linux/array_size.h>
9#include <linux/bitfield.h>
10#include <linux/bits.h>
11#include <linux/clk.h>
12#include <linux/device.h>
13#include <linux/err.h>
14#include <linux/iio/backend.h>
15#include <linux/iio/iio.h>
16#include <linux/mod_devicetable.h>
17#include <linux/module.h>
18#include <linux/mutex.h>
19#include <linux/regmap.h>
20#include <linux/regulator/consumer.h>
21#include <linux/spi/spi.h>
22#include <linux/types.h>
23#include <linux/unaligned.h>
24#include <linux/units.h>
25
26/* Register Definition */
27#define AD4080_REG_INTERFACE_CONFIG_A 0x00
28#define AD4080_REG_INTERFACE_CONFIG_B 0x01
29#define AD4080_REG_DEVICE_CONFIG 0x02
30#define AD4080_REG_CHIP_TYPE 0x03
31#define AD4080_REG_PRODUCT_ID_L 0x04
32#define AD4080_REG_PRODUCT_ID_H 0x05
33#define AD4080_REG_CHIP_GRADE 0x06
34#define AD4080_REG_SCRATCH_PAD 0x0A
35#define AD4080_REG_SPI_REVISION 0x0B
36#define AD4080_REG_VENDOR_L 0x0C
37#define AD4080_REG_VENDOR_H 0x0D
38#define AD4080_REG_STREAM_MODE 0x0E
39#define AD4080_REG_TRANSFER_CONFIG 0x0F
40#define AD4080_REG_INTERFACE_CONFIG_C 0x10
41#define AD4080_REG_INTERFACE_STATUS_A 0x11
42#define AD4080_REG_DEVICE_STATUS 0x14
43#define AD4080_REG_ADC_DATA_INTF_CONFIG_A 0x15
44#define AD4080_REG_ADC_DATA_INTF_CONFIG_B 0x16
45#define AD4080_REG_ADC_DATA_INTF_CONFIG_C 0x17
46#define AD4080_REG_PWR_CTRL 0x18
47#define AD4080_REG_GPIO_CONFIG_A 0x19
48#define AD4080_REG_GPIO_CONFIG_B 0x1A
49#define AD4080_REG_GPIO_CONFIG_C 0x1B
50#define AD4080_REG_GENERAL_CONFIG 0x1C
51#define AD4080_REG_FIFO_WATERMARK_LSB 0x1D
52#define AD4080_REG_FIFO_WATERMARK_MSB 0x1E
53#define AD4080_REG_EVENT_HYSTERESIS_LSB 0x1F
54#define AD4080_REG_EVENT_HYSTERESIS_MSB 0x20
55#define AD4080_REG_EVENT_DETECTION_HI_LSB 0x21
56#define AD4080_REG_EVENT_DETECTION_HI_MSB 0x22
57#define AD4080_REG_EVENT_DETECTION_LO_LSB 0x23
58#define AD4080_REG_EVENT_DETECTION_LO_MSB 0x24
59#define AD4080_REG_OFFSET_LSB 0x25
60#define AD4080_REG_OFFSET_MSB 0x26
61#define AD4080_REG_GAIN_LSB 0x27
62#define AD4080_REG_GAIN_MSB 0x28
63#define AD4080_REG_FILTER_CONFIG 0x29
64
65/* AD4080_REG_INTERFACE_CONFIG_A Bit Definition */
66#define AD4080_INTERFACE_CONFIG_A_SW_RESET (BIT(7) | BIT(0))
67#define AD4080_INTERFACE_CONFIG_A_ADDR_ASC BIT(5)
68#define AD4080_INTERFACE_CONFIG_A_SDO_ENABLE BIT(4)
69
70/* AD4080_REG_INTERFACE_CONFIG_B Bit Definition */
71#define AD4080_INTERFACE_CONFIG_B_SINGLE_INST BIT(7)
72#define AD4080_INTERFACE_CONFIG_B_SHORT_INST BIT(3)
73
74/* AD4080_REG_DEVICE_CONFIG Bit Definition */
75#define AD4080_DEVICE_CONFIG_OPERATING_MODES_MSK GENMASK(1, 0)
76
77/* AD4080_REG_TRANSFER_CONFIG Bit Definition */
78#define AD4080_TRANSFER_CONFIG_KEEP_STREAM_LENGTH_VAL BIT(2)
79
80/* AD4080_REG_INTERFACE_CONFIG_C Bit Definition */
81#define AD4080_INTERFACE_CONFIG_C_STRICT_REG_ACCESS BIT(5)
82
83/* AD4080_REG_ADC_DATA_INTF_CONFIG_A Bit Definition */
84#define AD4080_ADC_DATA_INTF_CONFIG_A_RESERVED_CONFIG_A BIT(6)
85#define AD4080_ADC_DATA_INTF_CONFIG_A_INTF_CHK_EN BIT(4)
86#define AD4080_ADC_DATA_INTF_CONFIG_A_SPI_LVDS_LANES BIT(2)
87#define AD4080_ADC_DATA_INTF_CONFIG_A_DATA_INTF_MODE BIT(0)
88
89/* AD4080_REG_ADC_DATA_INTF_CONFIG_B Bit Definition */
90#define AD4080_ADC_DATA_INTF_CONFIG_B_LVDS_CNV_CLK_CNT_MSK GENMASK(7, 4)
91#define AD4080_ADC_DATA_INTF_CONFIG_B_LVDS_SELF_CLK_MODE BIT(3)
92#define AD4080_ADC_DATA_INTF_CONFIG_B_LVDS_CNV_EN BIT(0)
93
94/* AD4080_REG_ADC_DATA_INTF_CONFIG_C Bit Definition */
95#define AD4080_ADC_DATA_INTF_CONFIG_C_LVDS_VOD_MSK GENMASK(6, 4)
96
97/* AD4080_REG_PWR_CTRL Bit Definition */
98#define AD4080_PWR_CTRL_ANA_DIG_LDO_PD BIT(1)
99#define AD4080_PWR_CTRL_INTF_LDO_PD BIT(0)
100
101/* AD4080_REG_GPIO_CONFIG_A Bit Definition */
102#define AD4080_GPIO_CONFIG_A_GPO_1_EN BIT(1)
103#define AD4080_GPIO_CONFIG_A_GPO_0_EN BIT(0)
104
105/* AD4080_REG_GPIO_CONFIG_B Bit Definition */
106#define AD4080_GPIO_CONFIG_B_GPIO_1_SEL_MSK GENMASK(7, 4)
107#define AD4080_GPIO_CONFIG_B_GPIO_0_SEL_MSK GENMASK(3, 0)
108#define AD4080_GPIO_CONFIG_B_GPIO_SPI_SDO 0
109#define AD4080_GPIO_CONFIG_B_GPIO_FIFO_FULL 1
110#define AD4080_GPIO_CONFIG_B_GPIO_FIFO_READ_DONE 2
111#define AD4080_GPIO_CONFIG_B_GPIO_FILTER_RES_RDY 3
112#define AD4080_GPIO_CONFIG_B_GPIO_H_THRESH 4
113#define AD4080_GPIO_CONFIG_B_GPIO_L_THRESH 5
114#define AD4080_GPIO_CONFIG_B_GPIO_STATUS_ALERT 6
115#define AD4080_GPIO_CONFIG_B_GPIO_GPIO_DATA 7
116#define AD4080_GPIO_CONFIG_B_GPIO_FILTER_SYNC 8
117#define AD4080_GPIO_CONFIG_B_GPIO_EXTERNAL_EVENT 9
118
119/* AD4080_REG_FIFO_CONFIG Bit Definition */
120#define AD4080_FIFO_CONFIG_FIFO_MODE_MSK GENMASK(1, 0)
121
122/* AD4080_REG_FILTER_CONFIG Bit Definition */
123#define AD4080_FILTER_CONFIG_SINC_DEC_RATE_MSK GENMASK(6, 3)
124#define AD4080_FILTER_CONFIG_FILTER_SEL_MSK GENMASK(1, 0)
125
126/* Miscellaneous Definitions */
127#define AD4080_SPI_READ BIT(7)
128#define AD4080_CHIP_ID 0x0050
129#define AD4081_CHIP_ID 0x0051
130#define AD4083_CHIP_ID 0x0053
131#define AD4084_CHIP_ID 0x0054
132#define AD4086_CHIP_ID 0x0056
133#define AD4087_CHIP_ID 0x0057
134
135#define AD4080_LVDS_CNV_CLK_CNT_MAX 7
136
137#define AD4080_MAX_SAMP_FREQ 40000000
138#define AD4080_MIN_SAMP_FREQ 1250000
139
140enum ad4080_filter_type {
141 FILTER_NONE,
142 SINC_1,
143 SINC_5,
144 SINC_5_COMP
145};
146
147static const unsigned int ad4080_scale_table[][2] = {
148 { 6000, 0 },
149};
150
151static const char *const ad4080_filter_type_iio_enum[] = {
152 [FILTER_NONE] = "none",
153 [SINC_1] = "sinc1",
154 [SINC_5] = "sinc5",
155 [SINC_5_COMP] = "sinc5+pf1",
156};
157
158static const int ad4080_dec_rate_avail[] = {
159 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024,
160};
161
162static const int ad4080_dec_rate_none[] = { 1 };
163
164static const char * const ad4080_power_supplies[] = {
165 "vdd33", "vdd11", "vddldo", "iovdd", "vrefin",
166};
167
168struct ad4080_chip_info {
169 const char *name;
170 unsigned int product_id;
171 int num_scales;
172 const unsigned int (*scale_table)[2];
173 const struct iio_chan_spec *channels;
174 unsigned int num_channels;
175 unsigned int lvds_cnv_clk_cnt_max;
176};
177
178struct ad4080_state {
179 struct regmap *regmap;
180 struct iio_backend *back;
181 const struct ad4080_chip_info *info;
182 /*
183 * Synchronize access to members the of driver state, and ensure
184 * atomicity of consecutive regmap operations.
185 */
186 struct mutex lock;
187 unsigned int num_lanes;
188 unsigned int dec_rate;
189 unsigned long clk_rate;
190 enum ad4080_filter_type filter_type;
191 bool lvds_cnv_en;
192};
193
194static const struct regmap_config ad4080_regmap_config = {
195 .reg_bits = 16,
196 .val_bits = 8,
197 .read_flag_mask = BIT(7),
198 .max_register = 0x29,
199};
200
201static int ad4080_reg_access(struct iio_dev *indio_dev, unsigned int reg,
202 unsigned int writeval, unsigned int *readval)
203{
204 struct ad4080_state *st = iio_priv(indio_dev);
205
206 if (readval)
207 return regmap_read(map: st->regmap, reg, val: readval);
208
209 return regmap_write(map: st->regmap, reg, val: writeval);
210}
211
212static int ad4080_get_scale(struct ad4080_state *st, int *val, int *val2)
213{
214 unsigned int tmp;
215
216 tmp = (st->info->scale_table[0][0] * 1000000ULL) >>
217 st->info->channels[0].scan_type.realbits;
218 *val = tmp / 1000000;
219 *val2 = tmp % 1000000;
220
221 return IIO_VAL_INT_PLUS_NANO;
222}
223
224static unsigned int ad4080_get_dec_rate(struct iio_dev *dev,
225 const struct iio_chan_spec *chan)
226{
227 struct ad4080_state *st = iio_priv(indio_dev: dev);
228 int ret;
229 unsigned int data;
230
231 ret = regmap_read(map: st->regmap, AD4080_REG_FILTER_CONFIG, val: &data);
232 if (ret)
233 return ret;
234
235 return 1 << (FIELD_GET(AD4080_FILTER_CONFIG_SINC_DEC_RATE_MSK, data) + 1);
236}
237
238static int ad4080_set_dec_rate(struct iio_dev *dev,
239 const struct iio_chan_spec *chan,
240 unsigned int mode)
241{
242 struct ad4080_state *st = iio_priv(indio_dev: dev);
243
244 guard(mutex)(T: &st->lock);
245
246 if ((st->filter_type >= SINC_5 && mode >= 512) || mode < 2)
247 return -EINVAL;
248
249 return regmap_update_bits(map: st->regmap, AD4080_REG_FILTER_CONFIG,
250 AD4080_FILTER_CONFIG_SINC_DEC_RATE_MSK,
251 FIELD_PREP(AD4080_FILTER_CONFIG_SINC_DEC_RATE_MSK,
252 (ilog2(mode) - 1)));
253}
254
255static int ad4080_read_raw(struct iio_dev *indio_dev,
256 struct iio_chan_spec const *chan,
257 int *val, int *val2, long m)
258{
259 struct ad4080_state *st = iio_priv(indio_dev);
260 int dec_rate;
261
262 switch (m) {
263 case IIO_CHAN_INFO_SCALE:
264 return ad4080_get_scale(st, val, val2);
265 case IIO_CHAN_INFO_SAMP_FREQ:
266 dec_rate = ad4080_get_dec_rate(dev: indio_dev, chan);
267 if (dec_rate < 0)
268 return dec_rate;
269 if (st->filter_type == SINC_5_COMP)
270 dec_rate *= 2;
271 if (st->filter_type)
272 *val = DIV_ROUND_CLOSEST(st->clk_rate, dec_rate);
273 else
274 *val = st->clk_rate;
275 return IIO_VAL_INT;
276 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
277 if (st->filter_type == FILTER_NONE) {
278 *val = 1;
279 } else {
280 *val = ad4080_get_dec_rate(dev: indio_dev, chan);
281 if (*val < 0)
282 return *val;
283 }
284 return IIO_VAL_INT;
285 default:
286 return -EINVAL;
287 }
288}
289
290static int ad4080_write_raw(struct iio_dev *indio_dev,
291 struct iio_chan_spec const *chan,
292 int val, int val2, long mask)
293{
294 struct ad4080_state *st = iio_priv(indio_dev);
295
296 switch (mask) {
297 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
298 if (st->filter_type == FILTER_NONE && val > 1)
299 return -EINVAL;
300
301 return ad4080_set_dec_rate(dev: indio_dev, chan, mode: val);
302 default:
303 return -EINVAL;
304 }
305}
306
307static int ad4080_lvds_sync_write(struct ad4080_state *st)
308{
309 struct device *dev = regmap_get_device(map: st->regmap);
310 int ret;
311
312 ret = regmap_set_bits(map: st->regmap, AD4080_REG_ADC_DATA_INTF_CONFIG_A,
313 AD4080_ADC_DATA_INTF_CONFIG_A_INTF_CHK_EN);
314 if (ret)
315 return ret;
316
317 ret = iio_backend_interface_data_align(back: st->back, timeout_us: 10000);
318 if (ret)
319 return dev_err_probe(dev, err: ret,
320 fmt: "Data alignment process failed\n");
321
322 dev_dbg(dev, "Success: Pattern correct and Locked!\n");
323 return regmap_clear_bits(map: st->regmap, AD4080_REG_ADC_DATA_INTF_CONFIG_A,
324 AD4080_ADC_DATA_INTF_CONFIG_A_INTF_CHK_EN);
325}
326
327static int ad4080_get_filter_type(struct iio_dev *dev,
328 const struct iio_chan_spec *chan)
329{
330 struct ad4080_state *st = iio_priv(indio_dev: dev);
331 unsigned int data;
332 int ret;
333
334 ret = regmap_read(map: st->regmap, AD4080_REG_FILTER_CONFIG, val: &data);
335 if (ret)
336 return ret;
337
338 return FIELD_GET(AD4080_FILTER_CONFIG_FILTER_SEL_MSK, data);
339}
340
341static int ad4080_set_filter_type(struct iio_dev *dev,
342 const struct iio_chan_spec *chan,
343 unsigned int mode)
344{
345 struct ad4080_state *st = iio_priv(indio_dev: dev);
346 int dec_rate;
347 int ret;
348
349 guard(mutex)(T: &st->lock);
350
351 dec_rate = ad4080_get_dec_rate(dev, chan);
352 if (dec_rate < 0)
353 return dec_rate;
354
355 if (mode >= SINC_5 && dec_rate >= 512)
356 return -EINVAL;
357
358 ret = iio_backend_filter_type_set(back: st->back, type: mode);
359 if (ret)
360 return ret;
361
362 ret = regmap_update_bits(map: st->regmap, AD4080_REG_FILTER_CONFIG,
363 AD4080_FILTER_CONFIG_FILTER_SEL_MSK,
364 FIELD_PREP(AD4080_FILTER_CONFIG_FILTER_SEL_MSK,
365 mode));
366 if (ret)
367 return ret;
368
369 st->filter_type = mode;
370
371 return 0;
372}
373
374static int ad4080_read_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 struct ad4080_state *st = iio_priv(indio_dev);
380
381 switch (mask) {
382 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
383 switch (st->filter_type) {
384 case FILTER_NONE:
385 *vals = ad4080_dec_rate_none;
386 *length = ARRAY_SIZE(ad4080_dec_rate_none);
387 break;
388 default:
389 *vals = ad4080_dec_rate_avail;
390 *length = st->filter_type >= SINC_5 ?
391 (ARRAY_SIZE(ad4080_dec_rate_avail) - 2) :
392 ARRAY_SIZE(ad4080_dec_rate_avail);
393 break;
394 }
395 *type = IIO_VAL_INT;
396 return IIO_AVAIL_LIST;
397 default:
398 return -EINVAL;
399 }
400}
401
402static const struct iio_info ad4080_iio_info = {
403 .debugfs_reg_access = ad4080_reg_access,
404 .read_raw = ad4080_read_raw,
405 .write_raw = ad4080_write_raw,
406 .read_avail = ad4080_read_avail,
407};
408
409static const struct iio_enum ad4080_filter_type_enum = {
410 .items = ad4080_filter_type_iio_enum,
411 .num_items = ARRAY_SIZE(ad4080_filter_type_iio_enum),
412 .set = ad4080_set_filter_type,
413 .get = ad4080_get_filter_type,
414};
415
416static struct iio_chan_spec_ext_info ad4080_ext_info[] = {
417 IIO_ENUM("filter_type", IIO_SHARED_BY_ALL, &ad4080_filter_type_enum),
418 IIO_ENUM_AVAILABLE("filter_type", IIO_SHARED_BY_ALL,
419 &ad4080_filter_type_enum),
420 { }
421};
422
423#define AD4080_CHANNEL_DEFINE(bits, storage) { \
424 .type = IIO_VOLTAGE, \
425 .indexed = 1, \
426 .channel = 0, \
427 .info_mask_separate = BIT(IIO_CHAN_INFO_SCALE), \
428 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
429 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
430 .info_mask_shared_by_all_available = \
431 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
432 .ext_info = ad4080_ext_info, \
433 .scan_index = 0, \
434 .scan_type = { \
435 .sign = 's', \
436 .realbits = (bits), \
437 .storagebits = (storage), \
438 }, \
439}
440
441static const struct iio_chan_spec ad4080_channel = AD4080_CHANNEL_DEFINE(20, 32);
442
443static const struct iio_chan_spec ad4081_channel = AD4080_CHANNEL_DEFINE(20, 32);
444
445static const struct iio_chan_spec ad4083_channel = AD4080_CHANNEL_DEFINE(16, 16);
446
447static const struct iio_chan_spec ad4084_channel = AD4080_CHANNEL_DEFINE(16, 16);
448
449static const struct iio_chan_spec ad4086_channel = AD4080_CHANNEL_DEFINE(14, 16);
450
451static const struct iio_chan_spec ad4087_channel = AD4080_CHANNEL_DEFINE(14, 16);
452
453static const struct ad4080_chip_info ad4080_chip_info = {
454 .name = "ad4080",
455 .product_id = AD4080_CHIP_ID,
456 .scale_table = ad4080_scale_table,
457 .num_scales = ARRAY_SIZE(ad4080_scale_table),
458 .num_channels = 1,
459 .channels = &ad4080_channel,
460 .lvds_cnv_clk_cnt_max = AD4080_LVDS_CNV_CLK_CNT_MAX,
461};
462
463static const struct ad4080_chip_info ad4081_chip_info = {
464 .name = "ad4081",
465 .product_id = AD4081_CHIP_ID,
466 .scale_table = ad4080_scale_table,
467 .num_scales = ARRAY_SIZE(ad4080_scale_table),
468 .num_channels = 1,
469 .channels = &ad4081_channel,
470 .lvds_cnv_clk_cnt_max = 2,
471};
472
473static const struct ad4080_chip_info ad4083_chip_info = {
474 .name = "ad4083",
475 .product_id = AD4083_CHIP_ID,
476 .scale_table = ad4080_scale_table,
477 .num_scales = ARRAY_SIZE(ad4080_scale_table),
478 .num_channels = 1,
479 .channels = &ad4083_channel,
480 .lvds_cnv_clk_cnt_max = 5,
481};
482
483static const struct ad4080_chip_info ad4084_chip_info = {
484 .name = "ad4084",
485 .product_id = AD4084_CHIP_ID,
486 .scale_table = ad4080_scale_table,
487 .num_scales = ARRAY_SIZE(ad4080_scale_table),
488 .num_channels = 1,
489 .channels = &ad4084_channel,
490 .lvds_cnv_clk_cnt_max = 2,
491};
492
493static const struct ad4080_chip_info ad4086_chip_info = {
494 .name = "ad4086",
495 .product_id = AD4086_CHIP_ID,
496 .scale_table = ad4080_scale_table,
497 .num_scales = ARRAY_SIZE(ad4080_scale_table),
498 .num_channels = 1,
499 .channels = &ad4086_channel,
500 .lvds_cnv_clk_cnt_max = 4,
501};
502
503static const struct ad4080_chip_info ad4087_chip_info = {
504 .name = "ad4087",
505 .product_id = AD4087_CHIP_ID,
506 .scale_table = ad4080_scale_table,
507 .num_scales = ARRAY_SIZE(ad4080_scale_table),
508 .num_channels = 1,
509 .channels = &ad4087_channel,
510 .lvds_cnv_clk_cnt_max = 1,
511};
512
513static int ad4080_setup(struct iio_dev *indio_dev)
514{
515 struct ad4080_state *st = iio_priv(indio_dev);
516 struct device *dev = regmap_get_device(map: st->regmap);
517 __le16 id_le;
518 u16 id;
519 int ret;
520
521 ret = regmap_write(map: st->regmap, AD4080_REG_INTERFACE_CONFIG_A,
522 AD4080_INTERFACE_CONFIG_A_SW_RESET);
523 if (ret)
524 return ret;
525
526 ret = regmap_write(map: st->regmap, AD4080_REG_INTERFACE_CONFIG_A,
527 AD4080_INTERFACE_CONFIG_A_SDO_ENABLE);
528 if (ret)
529 return ret;
530
531 ret = regmap_bulk_read(map: st->regmap, AD4080_REG_PRODUCT_ID_L, val: &id_le,
532 val_count: sizeof(id_le));
533 if (ret)
534 return ret;
535
536 id = le16_to_cpu(id_le);
537 if (id != st->info->product_id)
538 dev_info(dev, "Unrecognized CHIP_ID 0x%X\n", id);
539
540 ret = regmap_set_bits(map: st->regmap, AD4080_REG_GPIO_CONFIG_A,
541 AD4080_GPIO_CONFIG_A_GPO_1_EN);
542 if (ret)
543 return ret;
544
545 ret = regmap_write(map: st->regmap, AD4080_REG_GPIO_CONFIG_B,
546 FIELD_PREP(AD4080_GPIO_CONFIG_B_GPIO_1_SEL_MSK,
547 AD4080_GPIO_CONFIG_B_GPIO_FILTER_RES_RDY));
548 if (ret)
549 return ret;
550
551 ret = iio_backend_num_lanes_set(back: st->back, num_lanes: st->num_lanes);
552 if (ret)
553 return ret;
554
555 if (!st->lvds_cnv_en)
556 return 0;
557
558 /* Set maximum LVDS Data Transfer Latency */
559 ret = regmap_update_bits(map: st->regmap,
560 AD4080_REG_ADC_DATA_INTF_CONFIG_B,
561 AD4080_ADC_DATA_INTF_CONFIG_B_LVDS_CNV_CLK_CNT_MSK,
562 FIELD_PREP(AD4080_ADC_DATA_INTF_CONFIG_B_LVDS_CNV_CLK_CNT_MSK,
563 st->info->lvds_cnv_clk_cnt_max));
564 if (ret)
565 return ret;
566
567 if (st->num_lanes > 1) {
568 ret = regmap_set_bits(map: st->regmap, AD4080_REG_ADC_DATA_INTF_CONFIG_A,
569 AD4080_ADC_DATA_INTF_CONFIG_A_SPI_LVDS_LANES);
570 if (ret)
571 return ret;
572 }
573
574 ret = regmap_set_bits(map: st->regmap,
575 AD4080_REG_ADC_DATA_INTF_CONFIG_B,
576 AD4080_ADC_DATA_INTF_CONFIG_B_LVDS_CNV_EN);
577 if (ret)
578 return ret;
579
580 return ad4080_lvds_sync_write(st);
581}
582
583static int ad4080_properties_parse(struct ad4080_state *st)
584{
585 struct device *dev = regmap_get_device(map: st->regmap);
586
587 st->lvds_cnv_en = device_property_read_bool(dev, propname: "adi,lvds-cnv-enable");
588
589 st->num_lanes = 1;
590 device_property_read_u32(dev, propname: "adi,num-lanes", val: &st->num_lanes);
591 if (!st->num_lanes || st->num_lanes > 2)
592 return dev_err_probe(dev, err: -EINVAL,
593 fmt: "Invalid 'adi,num-lanes' value: %u",
594 st->num_lanes);
595
596 return 0;
597}
598
599static int ad4080_probe(struct spi_device *spi)
600{
601 struct iio_dev *indio_dev;
602 struct device *dev = &spi->dev;
603 struct ad4080_state *st;
604 struct clk *clk;
605 int ret;
606
607 indio_dev = devm_iio_device_alloc(parent: &spi->dev, sizeof_priv: sizeof(*st));
608 if (!indio_dev)
609 return -ENOMEM;
610
611 st = iio_priv(indio_dev);
612
613 ret = devm_regulator_bulk_get_enable(dev,
614 ARRAY_SIZE(ad4080_power_supplies),
615 id: ad4080_power_supplies);
616 if (ret)
617 return dev_err_probe(dev, err: ret,
618 fmt: "failed to get and enable supplies\n");
619
620 st->regmap = devm_regmap_init_spi(spi, &ad4080_regmap_config);
621 if (IS_ERR(ptr: st->regmap))
622 return PTR_ERR(ptr: st->regmap);
623
624 st->info = spi_get_device_match_data(sdev: spi);
625 if (!st->info)
626 return -ENODEV;
627
628 ret = devm_mutex_init(dev, &st->lock);
629 if (ret)
630 return ret;
631
632 indio_dev->name = st->info->name;
633 indio_dev->channels = st->info->channels;
634 indio_dev->num_channels = st->info->num_channels;
635 indio_dev->info = &ad4080_iio_info;
636
637 ret = ad4080_properties_parse(st);
638 if (ret)
639 return ret;
640
641 clk = devm_clk_get_enabled(dev: &spi->dev, id: "cnv");
642 if (IS_ERR(ptr: clk))
643 return PTR_ERR(ptr: clk);
644
645 st->clk_rate = clk_get_rate(clk);
646
647 st->back = devm_iio_backend_get(dev, NULL);
648 if (IS_ERR(ptr: st->back))
649 return PTR_ERR(ptr: st->back);
650
651 ret = devm_iio_backend_request_buffer(dev, back: st->back, indio_dev);
652 if (ret)
653 return ret;
654
655 ret = devm_iio_backend_enable(dev, back: st->back);
656 if (ret)
657 return ret;
658
659 ret = ad4080_setup(indio_dev);
660 if (ret)
661 return ret;
662
663 return devm_iio_device_register(&spi->dev, indio_dev);
664}
665
666static const struct spi_device_id ad4080_id[] = {
667 { "ad4080", (kernel_ulong_t)&ad4080_chip_info },
668 { "ad4081", (kernel_ulong_t)&ad4081_chip_info },
669 { "ad4083", (kernel_ulong_t)&ad4083_chip_info },
670 { "ad4084", (kernel_ulong_t)&ad4084_chip_info },
671 { "ad4086", (kernel_ulong_t)&ad4086_chip_info },
672 { "ad4087", (kernel_ulong_t)&ad4087_chip_info },
673 { }
674};
675MODULE_DEVICE_TABLE(spi, ad4080_id);
676
677static const struct of_device_id ad4080_of_match[] = {
678 { .compatible = "adi,ad4080", &ad4080_chip_info },
679 { .compatible = "adi,ad4081", &ad4081_chip_info },
680 { .compatible = "adi,ad4083", &ad4083_chip_info },
681 { .compatible = "adi,ad4084", &ad4084_chip_info },
682 { .compatible = "adi,ad4086", &ad4086_chip_info },
683 { .compatible = "adi,ad4087", &ad4087_chip_info },
684 { }
685};
686MODULE_DEVICE_TABLE(of, ad4080_of_match);
687
688static struct spi_driver ad4080_driver = {
689 .driver = {
690 .name = "ad4080",
691 .of_match_table = ad4080_of_match,
692 },
693 .probe = ad4080_probe,
694 .id_table = ad4080_id,
695};
696module_spi_driver(ad4080_driver);
697
698MODULE_AUTHOR("Antoniu Miclaus <antoniu.miclaus@analog.com");
699MODULE_DESCRIPTION("Analog Devices AD4080");
700MODULE_LICENSE("GPL");
701MODULE_IMPORT_NS("IIO_BACKEND");
702

source code of linux/drivers/iio/adc/ad4080.c