1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Analog Devices AD9467 SPI ADC driver
4 *
5 * Copyright 2012-2020 Analog Devices Inc.
6 */
7
8 #include <linux/bitmap.h>
9 #include <linux/bitops.h>
10 #include <linux/cleanup.h>
11 #include <linux/debugfs.h>
12 #include <linux/module.h>
13 #include <linux/mutex.h>
14 #include <linux/device.h>
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/spi/spi.h>
18 #include <linux/seq_file.h>
19 #include <linux/err.h>
20 #include <linux/delay.h>
21 #include <linux/gpio/consumer.h>
22 #include <linux/of.h>
23
24
25 #include <linux/iio/backend.h>
26 #include <linux/iio/iio.h>
27 #include <linux/iio/sysfs.h>
28
29 #include <linux/clk.h>
30
31 /*
32 * ADI High-Speed ADC common spi interface registers
33 * See Application-Note AN-877:
34 * https://www.analog.com/media/en/technical-documentation/application-notes/AN-877.pdf
35 */
36
37 #define AN877_ADC_REG_CHIP_PORT_CONF 0x00
38 #define AN877_ADC_REG_CHIP_ID 0x01
39 #define AN877_ADC_REG_CHIP_GRADE 0x02
40 #define AN877_ADC_REG_CHAN_INDEX 0x05
41 #define AN877_ADC_REG_TRANSFER 0xFF
42 #define AN877_ADC_REG_MODES 0x08
43 #define AN877_ADC_REG_TEST_IO 0x0D
44 #define AN877_ADC_REG_ADC_INPUT 0x0F
45 #define AN877_ADC_REG_OFFSET 0x10
46 #define AN877_ADC_REG_OUTPUT_MODE 0x14
47 #define AN877_ADC_REG_OUTPUT_ADJUST 0x15
48 #define AN877_ADC_REG_OUTPUT_PHASE 0x16
49 #define AN877_ADC_REG_OUTPUT_DELAY 0x17
50 #define AN877_ADC_REG_VREF 0x18
51 #define AN877_ADC_REG_ANALOG_INPUT 0x2C
52
53 /* AN877_ADC_REG_TEST_IO */
54 #define AN877_ADC_TESTMODE_OFF 0x0
55 #define AN877_ADC_TESTMODE_MIDSCALE_SHORT 0x1
56 #define AN877_ADC_TESTMODE_POS_FULLSCALE 0x2
57 #define AN877_ADC_TESTMODE_NEG_FULLSCALE 0x3
58 #define AN877_ADC_TESTMODE_ALT_CHECKERBOARD 0x4
59 #define AN877_ADC_TESTMODE_PN23_SEQ 0x5
60 #define AN877_ADC_TESTMODE_PN9_SEQ 0x6
61 #define AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE 0x7
62 #define AN877_ADC_TESTMODE_USER 0x8
63 #define AN877_ADC_TESTMODE_BIT_TOGGLE 0x9
64 #define AN877_ADC_TESTMODE_SYNC 0xA
65 #define AN877_ADC_TESTMODE_ONE_BIT_HIGH 0xB
66 #define AN877_ADC_TESTMODE_MIXED_BIT_FREQUENCY 0xC
67 #define AN877_ADC_TESTMODE_RAMP 0xF
68
69 /* AN877_ADC_REG_TRANSFER */
70 #define AN877_ADC_TRANSFER_SYNC 0x1
71
72 /* AN877_ADC_REG_OUTPUT_MODE */
73 #define AN877_ADC_OUTPUT_MODE_OFFSET_BINARY 0x0
74 #define AN877_ADC_OUTPUT_MODE_TWOS_COMPLEMENT 0x1
75 #define AN877_ADC_OUTPUT_MODE_GRAY_CODE 0x2
76
77 /* AN877_ADC_REG_OUTPUT_PHASE */
78 #define AN877_ADC_OUTPUT_EVEN_ODD_MODE_EN 0x20
79 #define AN877_ADC_INVERT_DCO_CLK 0x80
80
81 /* AN877_ADC_REG_OUTPUT_DELAY */
82 #define AN877_ADC_DCO_DELAY_ENABLE 0x80
83
84 /*
85 * Analog Devices AD9265 16-Bit, 125/105/80 MSPS ADC
86 */
87
88 #define CHIPID_AD9265 0x64
89 #define AD9265_DEF_OUTPUT_MODE 0x40
90 #define AD9265_REG_VREF_MASK 0xC0
91
92 /*
93 * Analog Devices AD9434 12-Bit, 370/500 MSPS ADC
94 */
95
96 #define CHIPID_AD9434 0x6A
97 #define AD9434_DEF_OUTPUT_MODE 0x00
98 #define AD9434_REG_VREF_MASK 0xC0
99
100 /*
101 * Analog Devices AD9467 16-Bit, 200/250 MSPS ADC
102 */
103
104 #define CHIPID_AD9467 0x50
105 #define AD9467_DEF_OUTPUT_MODE 0x08
106 #define AD9467_REG_VREF_MASK 0x0F
107
108 /*
109 * Analog Devices AD9643 14-Bit, 170/210/250 MSPS ADC
110 */
111
112 #define CHIPID_AD9643 0x82
113 #define AD9643_REG_VREF_MASK 0x1F
114
115 /*
116 * Analog Devices AD9652 16-bit 310 MSPS ADC
117 */
118
119 #define CHIPID_AD9652 0xC1
120 #define AD9652_REG_VREF_MASK 0xC0
121
122 /*
123 * Analog Devices AD9649 14-bit 20/40/65/80 MSPS ADC
124 */
125
126 #define CHIPID_AD9649 0x6F
127 #define AD9649_TEST_POINTS 8
128
129 #define AD9647_MAX_TEST_POINTS 32
130 #define AD9467_CAN_INVERT(st) \
131 (!(st)->info->has_dco || (st)->info->has_dco_invert)
132
133 struct ad9467_chip_info {
134 const char *name;
135 unsigned int id;
136 const struct iio_chan_spec *channels;
137 unsigned int num_channels;
138 const unsigned int (*scale_table)[2];
139 int num_scales;
140 unsigned long test_mask;
141 unsigned int test_mask_len;
142 unsigned long max_rate;
143 unsigned int default_output_mode;
144 unsigned int vref_mask;
145 unsigned int num_lanes;
146 unsigned int dco_en;
147 unsigned int test_points;
148 /* data clock output */
149 bool has_dco;
150 bool has_dco_invert;
151 };
152
153 struct ad9467_chan_test_mode {
154 struct ad9467_state *st;
155 unsigned int idx;
156 u8 mode;
157 };
158
159 struct ad9467_state {
160 const struct ad9467_chip_info *info;
161 struct iio_backend *back;
162 struct spi_device *spi;
163 struct clk *clk;
164 /* used for debugfs */
165 struct ad9467_chan_test_mode *chan_test;
166 unsigned int output_mode;
167 unsigned int (*scales)[2];
168 /*
169 * Times 2 because we may also invert the signal polarity and run the
170 * calibration again. For some reference on the test points (ad9265) see:
171 * https://www.analog.com/media/en/technical-documentation/data-sheets/ad9265.pdf
172 * at page 38 for the dco output delay. On devices as ad9467, the
173 * calibration is done at the backend level. For the ADI axi-adc:
174 * https://wiki.analog.com/resources/fpga/docs/axi_adc_ip
175 * at the io delay control section.
176 */
177 DECLARE_BITMAP(calib_map, AD9647_MAX_TEST_POINTS * 2);
178 /* number of bits of the map */
179 unsigned int calib_map_size;
180 struct gpio_desc *pwrdown_gpio;
181 /* ensure consistent state obtained on multiple related accesses */
182 struct mutex lock;
183 u8 buf[3] __aligned(IIO_DMA_MINALIGN);
184 };
185
ad9467_spi_read(struct ad9467_state * st,unsigned int reg)186 static int ad9467_spi_read(struct ad9467_state *st, unsigned int reg)
187 {
188 unsigned char tbuf[2], rbuf[1];
189 int ret;
190
191 tbuf[0] = 0x80 | (reg >> 8);
192 tbuf[1] = reg & 0xFF;
193
194 ret = spi_write_then_read(st->spi,
195 tbuf, ARRAY_SIZE(tbuf),
196 rbuf, ARRAY_SIZE(rbuf));
197
198 if (ret < 0)
199 return ret;
200
201 return rbuf[0];
202 }
203
ad9467_spi_write(struct ad9467_state * st,unsigned int reg,unsigned int val)204 static int ad9467_spi_write(struct ad9467_state *st, unsigned int reg,
205 unsigned int val)
206 {
207 st->buf[0] = reg >> 8;
208 st->buf[1] = reg & 0xFF;
209 st->buf[2] = val;
210
211 return spi_write(st->spi, st->buf, ARRAY_SIZE(st->buf));
212 }
213
ad9467_reg_access(struct iio_dev * indio_dev,unsigned int reg,unsigned int writeval,unsigned int * readval)214 static int ad9467_reg_access(struct iio_dev *indio_dev, unsigned int reg,
215 unsigned int writeval, unsigned int *readval)
216 {
217 struct ad9467_state *st = iio_priv(indio_dev);
218 int ret;
219
220 if (!readval) {
221 guard(mutex)(&st->lock);
222 ret = ad9467_spi_write(st, reg, writeval);
223 if (ret)
224 return ret;
225 return ad9467_spi_write(st, AN877_ADC_REG_TRANSFER,
226 AN877_ADC_TRANSFER_SYNC);
227 }
228
229 ret = ad9467_spi_read(st, reg);
230 if (ret < 0)
231 return ret;
232 *readval = ret;
233
234 return 0;
235 }
236
237 static const unsigned int ad9265_scale_table[][2] = {
238 {1250, 0x00}, {1500, 0x40}, {1750, 0x80}, {2000, 0xC0},
239 };
240
241 static const unsigned int ad9434_scale_table[][2] = {
242 {1600, 0x1C}, {1580, 0x1D}, {1550, 0x1E}, {1520, 0x1F}, {1500, 0x00},
243 {1470, 0x01}, {1440, 0x02}, {1420, 0x03}, {1390, 0x04}, {1360, 0x05},
244 {1340, 0x06}, {1310, 0x07}, {1280, 0x08}, {1260, 0x09}, {1230, 0x0A},
245 {1200, 0x0B}, {1180, 0x0C},
246 };
247
248 static const unsigned int ad9467_scale_table[][2] = {
249 {2000, 0}, {2100, 6}, {2200, 7},
250 {2300, 8}, {2400, 9}, {2500, 10},
251 };
252
253 static const unsigned int ad9643_scale_table[][2] = {
254 {2087, 0x0F}, {2065, 0x0E}, {2042, 0x0D}, {2020, 0x0C}, {1997, 0x0B},
255 {1975, 0x0A}, {1952, 0x09}, {1930, 0x08}, {1907, 0x07}, {1885, 0x06},
256 {1862, 0x05}, {1840, 0x04}, {1817, 0x03}, {1795, 0x02}, {1772, 0x01},
257 {1750, 0x00}, {1727, 0x1F}, {1704, 0x1E}, {1681, 0x1D}, {1658, 0x1C},
258 {1635, 0x1B}, {1612, 0x1A}, {1589, 0x19}, {1567, 0x18}, {1544, 0x17},
259 {1521, 0x16}, {1498, 0x15}, {1475, 0x14}, {1452, 0x13}, {1429, 0x12},
260 {1406, 0x11}, {1383, 0x10},
261 };
262
263 static const unsigned int ad9649_scale_table[][2] = {
264 {2000, 0},
265 };
266
267 static const unsigned int ad9652_scale_table[][2] = {
268 {1250, 0}, {1125, 1}, {1200, 2}, {1250, 3}, {1000, 5},
269 };
270
__ad9467_get_scale(struct ad9467_state * st,int index,unsigned int * val,unsigned int * val2)271 static void __ad9467_get_scale(struct ad9467_state *st, int index,
272 unsigned int *val, unsigned int *val2)
273 {
274 const struct ad9467_chip_info *info = st->info;
275 const struct iio_chan_spec *chan = &info->channels[0];
276 unsigned int tmp;
277
278 tmp = (info->scale_table[index][0] * 1000000ULL) >>
279 chan->scan_type.realbits;
280 *val = tmp / 1000000;
281 *val2 = tmp % 1000000;
282 }
283
284 #define AD9467_CHAN(_chan, avai_mask, _si, _bits, _sign) \
285 { \
286 .type = IIO_VOLTAGE, \
287 .indexed = 1, \
288 .channel = _chan, \
289 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
290 BIT(IIO_CHAN_INFO_SAMP_FREQ), \
291 .info_mask_shared_by_type_available = avai_mask, \
292 .scan_index = _si, \
293 .scan_type = { \
294 .sign = _sign, \
295 .realbits = _bits, \
296 .storagebits = 16, \
297 }, \
298 }
299
300 static const struct iio_chan_spec ad9434_channels[] = {
301 AD9467_CHAN(0, BIT(IIO_CHAN_INFO_SCALE), 0, 12, 's'),
302 };
303
304 static const struct iio_chan_spec ad9467_channels[] = {
305 AD9467_CHAN(0, BIT(IIO_CHAN_INFO_SCALE), 0, 16, 's'),
306 };
307
308 static const struct iio_chan_spec ad9643_channels[] = {
309 AD9467_CHAN(0, BIT(IIO_CHAN_INFO_SCALE), 0, 14, 's'),
310 AD9467_CHAN(1, BIT(IIO_CHAN_INFO_SCALE), 1, 14, 's'),
311 };
312
313 static const struct iio_chan_spec ad9649_channels[] = {
314 AD9467_CHAN(0, 0, 0, 14, 's'),
315 };
316
317 static const struct iio_chan_spec ad9652_channels[] = {
318 AD9467_CHAN(0, BIT(IIO_CHAN_INFO_SCALE), 0, 16, 's'),
319 AD9467_CHAN(1, BIT(IIO_CHAN_INFO_SCALE), 1, 16, 's'),
320 };
321
322 static const char * const ad9467_test_modes[] = {
323 [AN877_ADC_TESTMODE_OFF] = "off",
324 [AN877_ADC_TESTMODE_MIDSCALE_SHORT] = "midscale_short",
325 [AN877_ADC_TESTMODE_POS_FULLSCALE] = "pos_fullscale",
326 [AN877_ADC_TESTMODE_NEG_FULLSCALE] = "neg_fullscale",
327 [AN877_ADC_TESTMODE_ALT_CHECKERBOARD] = "checkerboard",
328 [AN877_ADC_TESTMODE_PN23_SEQ] = "prbs23",
329 [AN877_ADC_TESTMODE_PN9_SEQ] = "prbs9",
330 [AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE] = "one_zero_toggle",
331 [AN877_ADC_TESTMODE_USER] = "user",
332 [AN877_ADC_TESTMODE_BIT_TOGGLE] = "bit_toggle",
333 [AN877_ADC_TESTMODE_SYNC] = "sync",
334 [AN877_ADC_TESTMODE_ONE_BIT_HIGH] = "one_bit_high",
335 [AN877_ADC_TESTMODE_MIXED_BIT_FREQUENCY] = "mixed_bit_frequency",
336 [AN877_ADC_TESTMODE_RAMP] = "ramp",
337 };
338
339 static const struct ad9467_chip_info ad9467_chip_tbl = {
340 .name = "ad9467",
341 .id = CHIPID_AD9467,
342 .max_rate = 250000000UL,
343 .scale_table = ad9467_scale_table,
344 .num_scales = ARRAY_SIZE(ad9467_scale_table),
345 .channels = ad9467_channels,
346 .num_channels = ARRAY_SIZE(ad9467_channels),
347 .test_points = AD9647_MAX_TEST_POINTS,
348 .test_mask = GENMASK(AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE,
349 AN877_ADC_TESTMODE_OFF),
350 .test_mask_len = AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE + 1,
351 .default_output_mode = AD9467_DEF_OUTPUT_MODE,
352 .vref_mask = AD9467_REG_VREF_MASK,
353 .num_lanes = 8,
354 };
355
356 static const struct ad9467_chip_info ad9434_chip_tbl = {
357 .name = "ad9434",
358 .id = CHIPID_AD9434,
359 .max_rate = 500000000UL,
360 .scale_table = ad9434_scale_table,
361 .num_scales = ARRAY_SIZE(ad9434_scale_table),
362 .channels = ad9434_channels,
363 .num_channels = ARRAY_SIZE(ad9434_channels),
364 .test_points = AD9647_MAX_TEST_POINTS,
365 .test_mask = GENMASK(AN877_ADC_TESTMODE_USER, AN877_ADC_TESTMODE_OFF),
366 .test_mask_len = AN877_ADC_TESTMODE_USER + 1,
367 .default_output_mode = AD9434_DEF_OUTPUT_MODE,
368 .vref_mask = AD9434_REG_VREF_MASK,
369 .num_lanes = 6,
370 };
371
372 static const struct ad9467_chip_info ad9265_chip_tbl = {
373 .name = "ad9265",
374 .id = CHIPID_AD9265,
375 .max_rate = 125000000UL,
376 .scale_table = ad9265_scale_table,
377 .num_scales = ARRAY_SIZE(ad9265_scale_table),
378 .channels = ad9467_channels,
379 .num_channels = ARRAY_SIZE(ad9467_channels),
380 .test_points = AD9647_MAX_TEST_POINTS,
381 .test_mask = GENMASK(AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE,
382 AN877_ADC_TESTMODE_OFF),
383 .test_mask_len = AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE + 1,
384 .default_output_mode = AD9265_DEF_OUTPUT_MODE,
385 .vref_mask = AD9265_REG_VREF_MASK,
386 .has_dco = true,
387 .has_dco_invert = true,
388 };
389
390 static const struct ad9467_chip_info ad9643_chip_tbl = {
391 .name = "ad9643",
392 .id = CHIPID_AD9643,
393 .max_rate = 250000000UL,
394 .scale_table = ad9643_scale_table,
395 .num_scales = ARRAY_SIZE(ad9643_scale_table),
396 .channels = ad9643_channels,
397 .num_channels = ARRAY_SIZE(ad9643_channels),
398 .test_points = AD9647_MAX_TEST_POINTS,
399 .test_mask = BIT(AN877_ADC_TESTMODE_RAMP) |
400 GENMASK(AN877_ADC_TESTMODE_MIXED_BIT_FREQUENCY, AN877_ADC_TESTMODE_OFF),
401 .test_mask_len = AN877_ADC_TESTMODE_RAMP + 1,
402 .vref_mask = AD9643_REG_VREF_MASK,
403 .has_dco = true,
404 .has_dco_invert = true,
405 .dco_en = AN877_ADC_DCO_DELAY_ENABLE,
406 };
407
408 static const struct ad9467_chip_info ad9649_chip_tbl = {
409 .name = "ad9649",
410 .id = CHIPID_AD9649,
411 .max_rate = 80000000UL,
412 .scale_table = ad9649_scale_table,
413 .num_scales = ARRAY_SIZE(ad9649_scale_table),
414 .channels = ad9649_channels,
415 .num_channels = ARRAY_SIZE(ad9649_channels),
416 .test_points = AD9649_TEST_POINTS,
417 .test_mask = GENMASK(AN877_ADC_TESTMODE_MIXED_BIT_FREQUENCY,
418 AN877_ADC_TESTMODE_OFF),
419 .test_mask_len = AN877_ADC_TESTMODE_MIXED_BIT_FREQUENCY + 1,
420 .has_dco = true,
421 .has_dco_invert = true,
422 .dco_en = AN877_ADC_DCO_DELAY_ENABLE,
423 };
424
425 static const struct ad9467_chip_info ad9652_chip_tbl = {
426 .name = "ad9652",
427 .id = CHIPID_AD9652,
428 .max_rate = 310000000UL,
429 .scale_table = ad9652_scale_table,
430 .num_scales = ARRAY_SIZE(ad9652_scale_table),
431 .channels = ad9652_channels,
432 .num_channels = ARRAY_SIZE(ad9652_channels),
433 .test_points = AD9647_MAX_TEST_POINTS,
434 .test_mask = GENMASK(AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE,
435 AN877_ADC_TESTMODE_OFF),
436 .test_mask_len = AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE + 1,
437 .vref_mask = AD9652_REG_VREF_MASK,
438 .has_dco = true,
439 };
440
ad9467_get_scale(struct ad9467_state * st,int * val,int * val2)441 static int ad9467_get_scale(struct ad9467_state *st, int *val, int *val2)
442 {
443 const struct ad9467_chip_info *info = st->info;
444 unsigned int vref_val;
445 unsigned int i = 0;
446 int ret;
447
448 /* nothing to read if we only have one possible scale */
449 if (info->num_scales == 1)
450 goto out_get_scale;
451
452 ret = ad9467_spi_read(st, AN877_ADC_REG_VREF);
453 if (ret < 0)
454 return ret;
455
456 vref_val = ret & info->vref_mask;
457
458 for (i = 0; i < info->num_scales; i++) {
459 if (vref_val == info->scale_table[i][1])
460 break;
461 }
462
463 if (i == info->num_scales)
464 return -ERANGE;
465
466 out_get_scale:
467 __ad9467_get_scale(st, i, val, val2);
468
469 return IIO_VAL_INT_PLUS_MICRO;
470 }
471
ad9467_set_scale(struct ad9467_state * st,int val,int val2)472 static int ad9467_set_scale(struct ad9467_state *st, int val, int val2)
473 {
474 const struct ad9467_chip_info *info = st->info;
475 unsigned int scale_val[2];
476 unsigned int i;
477 int ret;
478
479 if (val != 0)
480 return -EINVAL;
481 if (info->num_scales == 1)
482 return -EOPNOTSUPP;
483
484 for (i = 0; i < info->num_scales; i++) {
485 __ad9467_get_scale(st, i, &scale_val[0], &scale_val[1]);
486 if (scale_val[0] != val || scale_val[1] != val2)
487 continue;
488
489 guard(mutex)(&st->lock);
490 ret = ad9467_spi_write(st, AN877_ADC_REG_VREF,
491 info->scale_table[i][1]);
492 if (ret < 0)
493 return ret;
494
495 return ad9467_spi_write(st, AN877_ADC_REG_TRANSFER,
496 AN877_ADC_TRANSFER_SYNC);
497 }
498
499 return -EINVAL;
500 }
501
ad9467_outputmode_set(struct ad9467_state * st,unsigned int mode)502 static int ad9467_outputmode_set(struct ad9467_state *st, unsigned int mode)
503 {
504 int ret;
505
506 ret = ad9467_spi_write(st, AN877_ADC_REG_OUTPUT_MODE, mode);
507 if (ret < 0)
508 return ret;
509
510 return ad9467_spi_write(st, AN877_ADC_REG_TRANSFER,
511 AN877_ADC_TRANSFER_SYNC);
512 }
513
ad9467_testmode_set(struct ad9467_state * st,unsigned int chan,unsigned int test_mode)514 static int ad9467_testmode_set(struct ad9467_state *st, unsigned int chan,
515 unsigned int test_mode)
516 {
517 int ret;
518
519 if (st->info->num_channels > 1) {
520 /* so that the test mode is only applied to one channel */
521 ret = ad9467_spi_write(st, AN877_ADC_REG_CHAN_INDEX, BIT(chan));
522 if (ret)
523 return ret;
524 }
525
526 ret = ad9467_spi_write(st, AN877_ADC_REG_TEST_IO, test_mode);
527 if (ret)
528 return ret;
529
530 if (st->info->num_channels > 1) {
531 /* go to default state where all channels get write commands */
532 ret = ad9467_spi_write(st, AN877_ADC_REG_CHAN_INDEX,
533 GENMASK(st->info->num_channels - 1, 0));
534 if (ret)
535 return ret;
536 }
537
538 return ad9467_spi_write(st, AN877_ADC_REG_TRANSFER,
539 AN877_ADC_TRANSFER_SYNC);
540 }
541
ad9467_backend_testmode_on(struct ad9467_state * st,unsigned int chan,enum iio_backend_test_pattern pattern)542 static int ad9467_backend_testmode_on(struct ad9467_state *st,
543 unsigned int chan,
544 enum iio_backend_test_pattern pattern)
545 {
546 struct iio_backend_data_fmt data = {
547 .enable = false,
548 };
549 int ret;
550
551 ret = iio_backend_data_format_set(st->back, chan, &data);
552 if (ret)
553 return ret;
554
555 ret = iio_backend_test_pattern_set(st->back, chan, pattern);
556 if (ret)
557 return ret;
558
559 return iio_backend_chan_enable(st->back, chan);
560 }
561
ad9467_backend_testmode_off(struct ad9467_state * st,unsigned int chan)562 static int ad9467_backend_testmode_off(struct ad9467_state *st,
563 unsigned int chan)
564 {
565 struct iio_backend_data_fmt data = {
566 .enable = true,
567 .sign_extend = true,
568 };
569 int ret;
570
571 ret = iio_backend_chan_disable(st->back, chan);
572 if (ret)
573 return ret;
574
575 ret = iio_backend_test_pattern_set(st->back, chan,
576 IIO_BACKEND_NO_TEST_PATTERN);
577 if (ret)
578 return ret;
579
580 return iio_backend_data_format_set(st->back, chan, &data);
581 }
582
ad9647_calibrate_prepare(struct ad9467_state * st)583 static int ad9647_calibrate_prepare(struct ad9467_state *st)
584 {
585 unsigned int c;
586 int ret;
587
588 ret = ad9467_outputmode_set(st, st->info->default_output_mode);
589 if (ret)
590 return ret;
591
592 for (c = 0; c < st->info->num_channels; c++) {
593 ret = ad9467_testmode_set(st, c, AN877_ADC_TESTMODE_PN9_SEQ);
594 if (ret)
595 return ret;
596
597 ret = ad9467_backend_testmode_on(st, c,
598 IIO_BACKEND_ADI_PRBS_9A);
599 if (ret)
600 return ret;
601 }
602
603 return 0;
604 }
605
ad9647_calibrate_polarity_set(struct ad9467_state * st,bool invert)606 static int ad9647_calibrate_polarity_set(struct ad9467_state *st,
607 bool invert)
608 {
609 enum iio_backend_sample_trigger trigger;
610
611 if (st->info->has_dco) {
612 unsigned int phase = AN877_ADC_OUTPUT_EVEN_ODD_MODE_EN;
613
614 if (invert)
615 phase |= AN877_ADC_INVERT_DCO_CLK;
616
617 return ad9467_spi_write(st, AN877_ADC_REG_OUTPUT_PHASE,
618 phase);
619 }
620
621 if (invert)
622 trigger = IIO_BACKEND_SAMPLE_TRIGGER_EDGE_FALLING;
623 else
624 trigger = IIO_BACKEND_SAMPLE_TRIGGER_EDGE_RISING;
625
626 return iio_backend_data_sample_trigger(st->back, trigger);
627 }
628
629 /*
630 * The idea is pretty simple. Find the max number of successful points in a row
631 * and get the one in the middle.
632 */
ad9467_find_optimal_point(const unsigned long * calib_map,unsigned int start,unsigned int nbits,unsigned int * val)633 static unsigned int ad9467_find_optimal_point(const unsigned long *calib_map,
634 unsigned int start,
635 unsigned int nbits,
636 unsigned int *val)
637 {
638 unsigned int bit = start, end, start_cnt, cnt = 0;
639
640 for_each_clear_bitrange_from(bit, end, calib_map, nbits + start) {
641 if (end - bit > cnt) {
642 cnt = end - bit;
643 start_cnt = bit;
644 }
645 }
646
647 if (cnt)
648 *val = start_cnt + cnt / 2;
649
650 return cnt;
651 }
652
ad9467_calibrate_apply(struct ad9467_state * st,unsigned int val)653 static int ad9467_calibrate_apply(struct ad9467_state *st, unsigned int val)
654 {
655 unsigned int lane;
656 int ret;
657
658 if (st->info->has_dco) {
659 ret = ad9467_spi_write(st, AN877_ADC_REG_OUTPUT_DELAY,
660 val | st->info->dco_en);
661 if (ret)
662 return ret;
663
664 return ad9467_spi_write(st, AN877_ADC_REG_TRANSFER,
665 AN877_ADC_TRANSFER_SYNC);
666 }
667
668 for (lane = 0; lane < st->info->num_lanes; lane++) {
669 ret = iio_backend_iodelay_set(st->back, lane, val);
670 if (ret)
671 return ret;
672 }
673
674 return 0;
675 }
676
ad9647_calibrate_stop(struct ad9467_state * st)677 static int ad9647_calibrate_stop(struct ad9467_state *st)
678 {
679 unsigned int c, mode;
680 int ret;
681
682 for (c = 0; c < st->info->num_channels; c++) {
683 ret = ad9467_backend_testmode_off(st, c);
684 if (ret)
685 return ret;
686
687 ret = ad9467_testmode_set(st, c, AN877_ADC_TESTMODE_OFF);
688 if (ret)
689 return ret;
690 }
691
692 mode = st->info->default_output_mode | AN877_ADC_OUTPUT_MODE_TWOS_COMPLEMENT;
693 return ad9467_outputmode_set(st, mode);
694 }
695
ad9467_calibrate(struct ad9467_state * st)696 static int ad9467_calibrate(struct ad9467_state *st)
697 {
698 unsigned int point, val, inv_val, cnt, inv_cnt = 0, c;
699 /*
700 * Half of the bitmap is for the inverted signal. The number of test
701 * points is the same though...
702 */
703 unsigned int test_points = st->info->test_points;
704 unsigned long sample_rate = clk_get_rate(st->clk);
705 struct device *dev = &st->spi->dev;
706 bool invert = false, stat;
707 int ret;
708
709 /* all points invalid */
710 bitmap_fill(st->calib_map, st->calib_map_size);
711
712 ret = ad9647_calibrate_prepare(st);
713 if (ret)
714 return ret;
715 retune:
716 ret = ad9647_calibrate_polarity_set(st, invert);
717 if (ret)
718 return ret;
719
720 for (point = 0; point < st->info->test_points; point++) {
721 ret = ad9467_calibrate_apply(st, point);
722 if (ret)
723 return ret;
724
725 for (c = 0; c < st->info->num_channels; c++) {
726 ret = iio_backend_chan_status(st->back, c, &stat);
727 if (ret)
728 return ret;
729
730 /*
731 * A point is considered valid if all channels report no
732 * error. If one reports an error, then we consider the
733 * point as invalid and we can break the loop right away.
734 */
735 if (stat) {
736 dev_dbg(dev, "Invalid point(%u, inv:%u) for CH:%u\n",
737 point, invert, c);
738 break;
739 }
740
741 if (c == st->info->num_channels - 1)
742 __clear_bit(point + invert * test_points,
743 st->calib_map);
744 }
745 }
746
747 if (!invert) {
748 cnt = ad9467_find_optimal_point(st->calib_map, 0, test_points,
749 &val);
750 /*
751 * We're happy if we find, at least, three good test points in
752 * a row.
753 */
754 if (cnt < 3) {
755 if (AD9467_CAN_INVERT(st)) {
756 invert = true;
757 goto retune;
758 }
759
760 if (!cnt)
761 return -EIO;
762 }
763 } else {
764 inv_cnt = ad9467_find_optimal_point(st->calib_map, test_points,
765 test_points, &inv_val);
766 if (!inv_cnt && !cnt)
767 return -EIO;
768 }
769
770 if (inv_cnt < cnt) {
771 ret = ad9647_calibrate_polarity_set(st, false);
772 if (ret)
773 return ret;
774 } else {
775 /*
776 * polarity inverted is the last test to run. Hence, there's no
777 * need to re-do any configuration. We just need to "normalize"
778 * the selected value.
779 */
780 val = inv_val - test_points;
781 }
782
783 if (st->info->has_dco)
784 dev_dbg(dev, "%sDCO 0x%X CLK %lu Hz\n", inv_cnt >= cnt ? "INVERT " : "",
785 val, sample_rate);
786 else
787 dev_dbg(dev, "%sIDELAY 0x%x\n", inv_cnt >= cnt ? "INVERT " : "",
788 val);
789
790 ret = ad9467_calibrate_apply(st, val);
791 if (ret)
792 return ret;
793
794 /* finally apply the optimal value */
795 return ad9647_calibrate_stop(st);
796 }
797
ad9467_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long m)798 static int ad9467_read_raw(struct iio_dev *indio_dev,
799 struct iio_chan_spec const *chan,
800 int *val, int *val2, long m)
801 {
802 struct ad9467_state *st = iio_priv(indio_dev);
803
804 switch (m) {
805 case IIO_CHAN_INFO_SCALE:
806 return ad9467_get_scale(st, val, val2);
807 case IIO_CHAN_INFO_SAMP_FREQ:
808 *val = clk_get_rate(st->clk);
809
810 return IIO_VAL_INT;
811 default:
812 return -EINVAL;
813 }
814 }
815
ad9467_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)816 static int ad9467_write_raw(struct iio_dev *indio_dev,
817 struct iio_chan_spec const *chan,
818 int val, int val2, long mask)
819 {
820 struct ad9467_state *st = iio_priv(indio_dev);
821 const struct ad9467_chip_info *info = st->info;
822 unsigned long sample_rate;
823 long r_clk;
824 int ret;
825
826 switch (mask) {
827 case IIO_CHAN_INFO_SCALE:
828 return ad9467_set_scale(st, val, val2);
829 case IIO_CHAN_INFO_SAMP_FREQ:
830 r_clk = clk_round_rate(st->clk, val);
831 if (r_clk < 0 || r_clk > info->max_rate) {
832 dev_warn(&st->spi->dev,
833 "Error setting ADC sample rate %ld", r_clk);
834 return -EINVAL;
835 }
836
837 sample_rate = clk_get_rate(st->clk);
838 /*
839 * clk_set_rate() would also do this but since we would still
840 * need it for avoiding an unnecessary calibration, do it now.
841 */
842 if (sample_rate == r_clk)
843 return 0;
844
845 iio_device_claim_direct_scoped(return -EBUSY, indio_dev) {
846 ret = clk_set_rate(st->clk, r_clk);
847 if (ret)
848 return ret;
849
850 guard(mutex)(&st->lock);
851 ret = ad9467_calibrate(st);
852 }
853 return ret;
854 default:
855 return -EINVAL;
856 }
857 }
858
ad9467_read_avail(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,const int ** vals,int * type,int * length,long mask)859 static int ad9467_read_avail(struct iio_dev *indio_dev,
860 struct iio_chan_spec const *chan,
861 const int **vals, int *type, int *length,
862 long mask)
863 {
864 struct ad9467_state *st = iio_priv(indio_dev);
865 const struct ad9467_chip_info *info = st->info;
866
867 switch (mask) {
868 case IIO_CHAN_INFO_SCALE:
869 *vals = (const int *)st->scales;
870 *type = IIO_VAL_INT_PLUS_MICRO;
871 /* Values are stored in a 2D matrix */
872 *length = info->num_scales * 2;
873 return IIO_AVAIL_LIST;
874 default:
875 return -EINVAL;
876 }
877 }
878
ad9467_update_scan_mode(struct iio_dev * indio_dev,const unsigned long * scan_mask)879 static int ad9467_update_scan_mode(struct iio_dev *indio_dev,
880 const unsigned long *scan_mask)
881 {
882 struct ad9467_state *st = iio_priv(indio_dev);
883 unsigned int c;
884 int ret;
885
886 for (c = 0; c < st->info->num_channels; c++) {
887 if (test_bit(c, scan_mask))
888 ret = iio_backend_chan_enable(st->back, c);
889 else
890 ret = iio_backend_chan_disable(st->back, c);
891 if (ret)
892 return ret;
893 }
894
895 return 0;
896 }
897
898 static struct iio_info ad9467_info = {
899 .read_raw = ad9467_read_raw,
900 .write_raw = ad9467_write_raw,
901 .update_scan_mode = ad9467_update_scan_mode,
902 .debugfs_reg_access = ad9467_reg_access,
903 .read_avail = ad9467_read_avail,
904 };
905
ad9467_scale_fill(struct ad9467_state * st)906 static int ad9467_scale_fill(struct ad9467_state *st)
907 {
908 const struct ad9467_chip_info *info = st->info;
909 unsigned int i, val1, val2;
910
911 st->scales = devm_kmalloc_array(&st->spi->dev, info->num_scales,
912 sizeof(*st->scales), GFP_KERNEL);
913 if (!st->scales)
914 return -ENOMEM;
915
916 for (i = 0; i < info->num_scales; i++) {
917 __ad9467_get_scale(st, i, &val1, &val2);
918 st->scales[i][0] = val1;
919 st->scales[i][1] = val2;
920 }
921
922 return 0;
923 }
924
ad9467_reset(struct device * dev)925 static int ad9467_reset(struct device *dev)
926 {
927 struct gpio_desc *gpio;
928
929 gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
930 if (IS_ERR_OR_NULL(gpio))
931 return PTR_ERR_OR_ZERO(gpio);
932
933 fsleep(1);
934 gpiod_set_value_cansleep(gpio, 0);
935 fsleep(10 * USEC_PER_MSEC);
936
937 return 0;
938 }
939
ad9467_iio_backend_get(struct ad9467_state * st)940 static int ad9467_iio_backend_get(struct ad9467_state *st)
941 {
942 struct device *dev = &st->spi->dev;
943 struct device_node *__back;
944
945 st->back = devm_iio_backend_get(dev, NULL);
946 if (!IS_ERR(st->back))
947 return 0;
948 /* If not found, don't error out as we might have legacy DT property */
949 if (PTR_ERR(st->back) != -ENOENT)
950 return PTR_ERR(st->back);
951
952 /*
953 * if we don't get the backend using the normal API's, use the legacy
954 * 'adi,adc-dev' property. So we get all nodes with that property, and
955 * look for the one pointing at us. Then we directly lookup that fwnode
956 * on the backend list of registered devices. This is done so we don't
957 * make io-backends mandatory which would break DT ABI.
958 */
959 for_each_node_with_property(__back, "adi,adc-dev") {
960 struct device_node *__me;
961
962 __me = of_parse_phandle(__back, "adi,adc-dev", 0);
963 if (!__me)
964 continue;
965
966 if (!device_match_of_node(dev, __me)) {
967 of_node_put(__me);
968 continue;
969 }
970
971 of_node_put(__me);
972 st->back = __devm_iio_backend_get_from_fwnode_lookup(dev,
973 of_fwnode_handle(__back));
974 of_node_put(__back);
975 return PTR_ERR_OR_ZERO(st->back);
976 }
977
978 return -ENODEV;
979 }
980
ad9467_test_mode_available_show(struct seq_file * s,void * ignored)981 static int ad9467_test_mode_available_show(struct seq_file *s, void *ignored)
982 {
983 struct ad9467_state *st = s->private;
984 unsigned int bit;
985
986 for_each_set_bit(bit, &st->info->test_mask, st->info->test_mask_len)
987 seq_printf(s, "%s\n", ad9467_test_modes[bit]);
988
989 return 0;
990 }
991 DEFINE_SHOW_ATTRIBUTE(ad9467_test_mode_available);
992
ad9467_chan_test_mode_read(struct file * file,char __user * userbuf,size_t count,loff_t * ppos)993 static ssize_t ad9467_chan_test_mode_read(struct file *file,
994 char __user *userbuf, size_t count,
995 loff_t *ppos)
996 {
997 struct ad9467_chan_test_mode *chan = file->private_data;
998 struct ad9467_state *st = chan->st;
999 char buf[128] = {0};
1000 size_t len;
1001 int ret;
1002
1003 if (chan->mode == AN877_ADC_TESTMODE_PN9_SEQ ||
1004 chan->mode == AN877_ADC_TESTMODE_PN23_SEQ) {
1005 len = scnprintf(buf, sizeof(buf), "Running \"%s\" Test:\n\t",
1006 ad9467_test_modes[chan->mode]);
1007
1008 ret = iio_backend_debugfs_print_chan_status(st->back, chan->idx,
1009 buf + len,
1010 sizeof(buf) - len);
1011 if (ret < 0)
1012 return ret;
1013 len += ret;
1014 } else if (chan->mode == AN877_ADC_TESTMODE_OFF) {
1015 len = scnprintf(buf, sizeof(buf), "No test Running...\n");
1016 } else {
1017 len = scnprintf(buf, sizeof(buf), "Running \"%s\" Test on CH:%u\n",
1018 ad9467_test_modes[chan->mode], chan->idx);
1019 }
1020
1021 return simple_read_from_buffer(userbuf, count, ppos, buf, len);
1022 }
1023
ad9467_chan_test_mode_write(struct file * file,const char __user * userbuf,size_t count,loff_t * ppos)1024 static ssize_t ad9467_chan_test_mode_write(struct file *file,
1025 const char __user *userbuf,
1026 size_t count, loff_t *ppos)
1027 {
1028 struct ad9467_chan_test_mode *chan = file->private_data;
1029 struct ad9467_state *st = chan->st;
1030 char test_mode[32] = {0};
1031 unsigned int mode;
1032 int ret;
1033
1034 ret = simple_write_to_buffer(test_mode, sizeof(test_mode) - 1, ppos,
1035 userbuf, count);
1036 if (ret < 0)
1037 return ret;
1038
1039 for_each_set_bit(mode, &st->info->test_mask, st->info->test_mask_len) {
1040 if (sysfs_streq(test_mode, ad9467_test_modes[mode]))
1041 break;
1042 }
1043
1044 if (mode == st->info->test_mask_len)
1045 return -EINVAL;
1046
1047 guard(mutex)(&st->lock);
1048
1049 if (mode == AN877_ADC_TESTMODE_OFF) {
1050 unsigned int out_mode;
1051
1052 if (chan->mode == AN877_ADC_TESTMODE_PN9_SEQ ||
1053 chan->mode == AN877_ADC_TESTMODE_PN23_SEQ) {
1054 ret = ad9467_backend_testmode_off(st, chan->idx);
1055 if (ret)
1056 return ret;
1057 }
1058
1059 ret = ad9467_testmode_set(st, chan->idx, mode);
1060 if (ret)
1061 return ret;
1062
1063 out_mode = st->info->default_output_mode | AN877_ADC_OUTPUT_MODE_TWOS_COMPLEMENT;
1064 ret = ad9467_outputmode_set(st, out_mode);
1065 if (ret)
1066 return ret;
1067 } else {
1068 ret = ad9467_outputmode_set(st, st->info->default_output_mode);
1069 if (ret)
1070 return ret;
1071
1072 ret = ad9467_testmode_set(st, chan->idx, mode);
1073 if (ret)
1074 return ret;
1075
1076 /* some patterns have a backend matching monitoring block */
1077 if (mode == AN877_ADC_TESTMODE_PN9_SEQ) {
1078 ret = ad9467_backend_testmode_on(st, chan->idx,
1079 IIO_BACKEND_ADI_PRBS_9A);
1080 if (ret)
1081 return ret;
1082 } else if (mode == AN877_ADC_TESTMODE_PN23_SEQ) {
1083 ret = ad9467_backend_testmode_on(st, chan->idx,
1084 IIO_BACKEND_ADI_PRBS_23A);
1085 if (ret)
1086 return ret;
1087 }
1088 }
1089
1090 chan->mode = mode;
1091
1092 return count;
1093 }
1094
1095 static const struct file_operations ad9467_chan_test_mode_fops = {
1096 .open = simple_open,
1097 .read = ad9467_chan_test_mode_read,
1098 .write = ad9467_chan_test_mode_write,
1099 .llseek = default_llseek,
1100 .owner = THIS_MODULE,
1101 };
1102
ad9467_dump_calib_table(struct file * file,char __user * userbuf,size_t count,loff_t * ppos)1103 static ssize_t ad9467_dump_calib_table(struct file *file,
1104 char __user *userbuf,
1105 size_t count, loff_t *ppos)
1106 {
1107 struct ad9467_state *st = file->private_data;
1108 unsigned int bit;
1109 /* +2 for the newline and +1 for the string termination */
1110 unsigned char map[AD9647_MAX_TEST_POINTS * 2 + 3];
1111 ssize_t len = 0;
1112
1113 guard(mutex)(&st->lock);
1114 if (*ppos)
1115 goto out_read;
1116
1117 for (bit = 0; bit < st->calib_map_size; bit++) {
1118 if (AD9467_CAN_INVERT(st) && bit == st->calib_map_size / 2)
1119 len += scnprintf(map + len, sizeof(map) - len, "\n");
1120
1121 len += scnprintf(map + len, sizeof(map) - len, "%c",
1122 test_bit(bit, st->calib_map) ? 'x' : 'o');
1123 }
1124
1125 len += scnprintf(map + len, sizeof(map) - len, "\n");
1126 out_read:
1127 return simple_read_from_buffer(userbuf, count, ppos, map, len);
1128 }
1129
1130 static const struct file_operations ad9467_calib_table_fops = {
1131 .open = simple_open,
1132 .read = ad9467_dump_calib_table,
1133 .llseek = default_llseek,
1134 .owner = THIS_MODULE,
1135 };
1136
ad9467_debugfs_init(struct iio_dev * indio_dev)1137 static void ad9467_debugfs_init(struct iio_dev *indio_dev)
1138 {
1139 struct dentry *d = iio_get_debugfs_dentry(indio_dev);
1140 struct ad9467_state *st = iio_priv(indio_dev);
1141 char attr_name[32];
1142 unsigned int chan;
1143
1144 if (!IS_ENABLED(CONFIG_DEBUG_FS))
1145 return;
1146
1147 st->chan_test = devm_kcalloc(&st->spi->dev, st->info->num_channels,
1148 sizeof(*st->chan_test), GFP_KERNEL);
1149 if (!st->chan_test)
1150 return;
1151
1152 debugfs_create_file("calibration_table_dump", 0400, d, st,
1153 &ad9467_calib_table_fops);
1154
1155 for (chan = 0; chan < st->info->num_channels; chan++) {
1156 snprintf(attr_name, sizeof(attr_name), "in_voltage%u_test_mode",
1157 chan);
1158 st->chan_test[chan].idx = chan;
1159 st->chan_test[chan].st = st;
1160 debugfs_create_file(attr_name, 0600, d, &st->chan_test[chan],
1161 &ad9467_chan_test_mode_fops);
1162 }
1163
1164 debugfs_create_file("in_voltage_test_mode_available", 0400, d, st,
1165 &ad9467_test_mode_available_fops);
1166
1167 iio_backend_debugfs_add(st->back, indio_dev);
1168 }
1169
ad9467_probe(struct spi_device * spi)1170 static int ad9467_probe(struct spi_device *spi)
1171 {
1172 struct iio_dev *indio_dev;
1173 struct ad9467_state *st;
1174 unsigned int id;
1175 int ret;
1176
1177 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
1178 if (!indio_dev)
1179 return -ENOMEM;
1180
1181 st = iio_priv(indio_dev);
1182 st->spi = spi;
1183
1184 st->info = spi_get_device_match_data(spi);
1185 if (!st->info)
1186 return -ENODEV;
1187
1188 st->calib_map_size = st->info->test_points;
1189 if (AD9467_CAN_INVERT(st))
1190 st->calib_map_size *= 2;
1191
1192 st->clk = devm_clk_get_enabled(&spi->dev, "adc-clk");
1193 if (IS_ERR(st->clk))
1194 return PTR_ERR(st->clk);
1195
1196 st->pwrdown_gpio = devm_gpiod_get_optional(&spi->dev, "powerdown",
1197 GPIOD_OUT_LOW);
1198 if (IS_ERR(st->pwrdown_gpio))
1199 return PTR_ERR(st->pwrdown_gpio);
1200
1201 ret = ad9467_reset(&spi->dev);
1202 if (ret)
1203 return ret;
1204
1205 ret = ad9467_scale_fill(st);
1206 if (ret)
1207 return ret;
1208
1209 id = ad9467_spi_read(st, AN877_ADC_REG_CHIP_ID);
1210 if (id != st->info->id) {
1211 dev_err(&spi->dev, "Mismatch CHIP_ID, got 0x%X, expected 0x%X\n",
1212 id, st->info->id);
1213 return -ENODEV;
1214 }
1215
1216 if (st->info->num_scales > 1)
1217 ad9467_info.read_avail = ad9467_read_avail;
1218 indio_dev->name = st->info->name;
1219 indio_dev->channels = st->info->channels;
1220 indio_dev->num_channels = st->info->num_channels;
1221 indio_dev->info = &ad9467_info;
1222
1223 ret = ad9467_iio_backend_get(st);
1224 if (ret)
1225 return ret;
1226
1227 ret = devm_iio_backend_request_buffer(&spi->dev, st->back, indio_dev);
1228 if (ret)
1229 return ret;
1230
1231 ret = devm_iio_backend_enable(&spi->dev, st->back);
1232 if (ret)
1233 return ret;
1234
1235 ret = ad9467_calibrate(st);
1236 if (ret)
1237 return ret;
1238
1239 ret = devm_iio_device_register(&spi->dev, indio_dev);
1240 if (ret)
1241 return ret;
1242
1243 ad9467_debugfs_init(indio_dev);
1244
1245 return 0;
1246 }
1247
1248 static const struct of_device_id ad9467_of_match[] = {
1249 { .compatible = "adi,ad9265", .data = &ad9265_chip_tbl, },
1250 { .compatible = "adi,ad9434", .data = &ad9434_chip_tbl, },
1251 { .compatible = "adi,ad9467", .data = &ad9467_chip_tbl, },
1252 { .compatible = "adi,ad9643", .data = &ad9643_chip_tbl, },
1253 { .compatible = "adi,ad9649", .data = &ad9649_chip_tbl, },
1254 { .compatible = "adi,ad9652", .data = &ad9652_chip_tbl, },
1255 { }
1256 };
1257 MODULE_DEVICE_TABLE(of, ad9467_of_match);
1258
1259 static const struct spi_device_id ad9467_ids[] = {
1260 { "ad9265", (kernel_ulong_t)&ad9265_chip_tbl },
1261 { "ad9434", (kernel_ulong_t)&ad9434_chip_tbl },
1262 { "ad9467", (kernel_ulong_t)&ad9467_chip_tbl },
1263 { "ad9643", (kernel_ulong_t)&ad9643_chip_tbl },
1264 { "ad9649", (kernel_ulong_t)&ad9649_chip_tbl, },
1265 { "ad9652", (kernel_ulong_t)&ad9652_chip_tbl, },
1266 { }
1267 };
1268 MODULE_DEVICE_TABLE(spi, ad9467_ids);
1269
1270 static struct spi_driver ad9467_driver = {
1271 .driver = {
1272 .name = "ad9467",
1273 .of_match_table = ad9467_of_match,
1274 },
1275 .probe = ad9467_probe,
1276 .id_table = ad9467_ids,
1277 };
1278 module_spi_driver(ad9467_driver);
1279
1280 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
1281 MODULE_DESCRIPTION("Analog Devices AD9467 ADC driver");
1282 MODULE_LICENSE("GPL v2");
1283 MODULE_IMPORT_NS(IIO_BACKEND);
1284