1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Analog Devices AD3552R
* Digital to Analog converter driver, High Speed version
*
* Copyright 2024 Analog Devices Inc.
*/
#include <linux/bitfield.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/iio/backend.h>
#include <linux/iio/buffer.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/units.h>
#include "ad3552r.h"
#include "ad3552r-hs.h"
struct ad3552r_hs_state {
const struct ad3552r_model_data *model_data;
struct gpio_desc *reset_gpio;
struct device *dev;
struct iio_backend *back;
bool single_channel;
struct ad3552r_ch_data ch_data[AD3552R_MAX_CH];
struct ad3552r_hs_platform_data *data;
};
static int ad3552r_qspi_update_reg_bits(struct ad3552r_hs_state *st,
u32 reg, u32 mask, u32 val,
size_t xfer_size)
{
u32 rval;
int ret;
ret = st->data->bus_reg_read(st->back, reg, &rval, xfer_size);
if (ret)
return ret;
rval = (rval & ~mask) | val;
return st->data->bus_reg_write(st->back, reg, rval, xfer_size);
}
static int ad3552r_hs_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct ad3552r_hs_state *st = iio_priv(indio_dev);
int ret;
int ch = chan->channel;
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
/*
* Using 4 lanes (QSPI), then using 2 as DDR mode is
* considered always on (considering buffering mode always).
*/
*val = DIV_ROUND_CLOSEST(st->data->bus_sample_data_clock_hz *
4 * 2, chan->scan_type.realbits);
return IIO_VAL_INT;
case IIO_CHAN_INFO_RAW:
ret = st->data->bus_reg_read(st->back,
AD3552R_REG_ADDR_CH_DAC_16B(chan->channel),
val, 2);
if (ret)
return ret;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
*val = st->ch_data[ch].scale_int;
*val2 = st->ch_data[ch].scale_dec;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_CHAN_INFO_OFFSET:
*val = st->ch_data[ch].offset_int;
*val2 = st->ch_data[ch].offset_dec;
return IIO_VAL_INT_PLUS_MICRO;
default:
return -EINVAL;
}
}
static int ad3552r_hs_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
{
struct ad3552r_hs_state *st = iio_priv(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_RAW:
iio_device_claim_direct_scoped(return -EBUSY, indio_dev) {
return st->data->bus_reg_write(st->back,
AD3552R_REG_ADDR_CH_DAC_16B(chan->channel),
val, 2);
}
unreachable();
default:
return -EINVAL;
}
}
static int ad3552r_hs_buffer_postenable(struct iio_dev *indio_dev)
{
struct ad3552r_hs_state *st = iio_priv(indio_dev);
struct iio_backend_data_fmt fmt = {
.type = IIO_BACKEND_DATA_UNSIGNED
};
int loop_len, val, ret;
switch (*indio_dev->active_scan_mask) {
case AD3552R_CH0_ACTIVE:
st->single_channel = true;
loop_len = 2;
val = AD3552R_REG_ADDR_CH_DAC_16B(0);
break;
case AD3552R_CH1_ACTIVE:
st->single_channel = true;
loop_len = 2;
val = AD3552R_REG_ADDR_CH_DAC_16B(1);
break;
case AD3552R_CH0_ACTIVE | AD3552R_CH1_ACTIVE:
st->single_channel = false;
loop_len = 4;
val = AD3552R_REG_ADDR_CH_DAC_16B(1);
break;
default:
return -EINVAL;
}
ret = st->data->bus_reg_write(st->back, AD3552R_REG_ADDR_STREAM_MODE,
loop_len, 1);
if (ret)
return ret;
/* Inform DAC chip to switch into DDR mode */
ret = ad3552r_qspi_update_reg_bits(st,
AD3552R_REG_ADDR_INTERFACE_CONFIG_D,
AD3552R_MASK_SPI_CONFIG_DDR,
AD3552R_MASK_SPI_CONFIG_DDR, 1);
if (ret)
return ret;
/* Inform DAC IP to go for DDR mode from now on */
ret = iio_backend_ddr_enable(st->back);
if (ret) {
dev_err(st->dev, "could not set DDR mode, not streaming");
goto exit_err;
}
ret = iio_backend_data_transfer_addr(st->back, val);
if (ret)
goto exit_err;
ret = iio_backend_data_format_set(st->back, 0, &fmt);
if (ret)
goto exit_err;
ret = iio_backend_data_stream_enable(st->back);
if (ret)
goto exit_err;
return 0;
exit_err:
ad3552r_qspi_update_reg_bits(st,
AD3552R_REG_ADDR_INTERFACE_CONFIG_D,
AD3552R_MASK_SPI_CONFIG_DDR,
0, 1);
iio_backend_ddr_disable(st->back);
return ret;
}
static int ad3552r_hs_buffer_predisable(struct iio_dev *indio_dev)
{
struct ad3552r_hs_state *st = iio_priv(indio_dev);
int ret;
ret = iio_backend_data_stream_disable(st->back);
if (ret)
return ret;
/* Inform DAC to set in SDR mode */
ret = ad3552r_qspi_update_reg_bits(st,
AD3552R_REG_ADDR_INTERFACE_CONFIG_D,
AD3552R_MASK_SPI_CONFIG_DDR,
0, 1);
if (ret)
return ret;
ret = iio_backend_ddr_disable(st->back);
if (ret)
return ret;
return 0;
}
static inline int ad3552r_hs_set_output_range(struct ad3552r_hs_state *st,
int ch, unsigned int mode)
{
int val;
if (ch == 0)
val = FIELD_PREP(AD3552R_MASK_CH0_RANGE, mode);
else
val = FIELD_PREP(AD3552R_MASK_CH1_RANGE, mode);
return ad3552r_qspi_update_reg_bits(st,
AD3552R_REG_ADDR_CH0_CH1_OUTPUT_RANGE,
AD3552R_MASK_CH_OUTPUT_RANGE_SEL(ch),
val, 1);
}
static int ad3552r_hs_reset(struct ad3552r_hs_state *st)
{
int ret;
st->reset_gpio = devm_gpiod_get_optional(st->dev,
"reset", GPIOD_OUT_HIGH);
if (IS_ERR(st->reset_gpio))
return PTR_ERR(st->reset_gpio);
if (st->reset_gpio) {
fsleep(10);
gpiod_set_value_cansleep(st->reset_gpio, 0);
} else {
ret = ad3552r_qspi_update_reg_bits(st,
AD3552R_REG_ADDR_INTERFACE_CONFIG_A,
AD3552R_MASK_SOFTWARE_RESET,
AD3552R_MASK_SOFTWARE_RESET, 1);
if (ret)
return ret;
}
msleep(100);
return 0;
}
static int ad3552r_hs_scratch_pad_test(struct ad3552r_hs_state *st)
{
int ret, val;
ret = st->data->bus_reg_write(st->back, AD3552R_REG_ADDR_SCRATCH_PAD,
AD3552R_SCRATCH_PAD_TEST_VAL1, 1);
if (ret)
return ret;
ret = st->data->bus_reg_read(st->back, AD3552R_REG_ADDR_SCRATCH_PAD,
&val, 1);
if (ret)
return ret;
if (val != AD3552R_SCRATCH_PAD_TEST_VAL1)
return dev_err_probe(st->dev, -EIO,
"SCRATCH_PAD_TEST mismatch. Expected 0x%x, Read 0x%x\n",
AD3552R_SCRATCH_PAD_TEST_VAL1, val);
ret = st->data->bus_reg_write(st->back, AD3552R_REG_ADDR_SCRATCH_PAD,
AD3552R_SCRATCH_PAD_TEST_VAL2, 1);
if (ret)
return ret;
ret = st->data->bus_reg_read(st->back, AD3552R_REG_ADDR_SCRATCH_PAD,
&val, 1);
if (ret)
return ret;
if (val != AD3552R_SCRATCH_PAD_TEST_VAL2)
return dev_err_probe(st->dev, -EIO,
"SCRATCH_PAD_TEST mismatch. Expected 0x%x, Read 0x%x\n",
AD3552R_SCRATCH_PAD_TEST_VAL2, val);
return 0;
}
static int ad3552r_hs_setup_custom_gain(struct ad3552r_hs_state *st,
int ch, u16 gain, u16 offset)
{
int ret;
ret = st->data->bus_reg_write(st->back, AD3552R_REG_ADDR_CH_OFFSET(ch),
offset, 1);
if (ret)
return ret;
return st->data->bus_reg_write(st->back, AD3552R_REG_ADDR_CH_GAIN(ch),
gain, 1);
}
static int ad3552r_hs_setup(struct ad3552r_hs_state *st)
{
u16 id;
u16 gain = 0, offset = 0;
u32 ch, val, range;
int ret;
ret = ad3552r_hs_reset(st);
if (ret)
return ret;
ret = iio_backend_ddr_disable(st->back);
if (ret)
return ret;
ret = ad3552r_hs_scratch_pad_test(st);
if (ret)
return ret;
ret = st->data->bus_reg_read(st->back, AD3552R_REG_ADDR_PRODUCT_ID_L,
&val, 1);
if (ret)
return ret;
id = val;
ret = st->data->bus_reg_read(st->back, AD3552R_REG_ADDR_PRODUCT_ID_H,
&val, 1);
if (ret)
return ret;
id |= val << 8;
if (id != st->model_data->chip_id)
dev_info(st->dev, "Chip ID error. Expected 0x%x, Read 0x%x\n",
AD3552R_ID, id);
ret = st->data->bus_reg_write(st->back,
AD3552R_REG_ADDR_SH_REFERENCE_CONFIG,
0, 1);
if (ret)
return ret;
ret = st->data->bus_reg_write(st->back,
AD3552R_REG_ADDR_TRANSFER_REGISTER,
FIELD_PREP(AD3552R_MASK_MULTI_IO_MODE,
AD3552R_QUAD_SPI) |
AD3552R_MASK_STREAM_LENGTH_KEEP_VALUE, 1);
if (ret)
return ret;
ret = iio_backend_data_source_set(st->back, 0, IIO_BACKEND_EXTERNAL);
if (ret)
return ret;
ret = iio_backend_data_source_set(st->back, 1, IIO_BACKEND_EXTERNAL);
if (ret)
return ret;
ret = ad3552r_get_ref_voltage(st->dev, &val);
if (ret < 0)
return ret;
val = ret;
ret = ad3552r_qspi_update_reg_bits(st,
AD3552R_REG_ADDR_SH_REFERENCE_CONFIG,
AD3552R_MASK_REFERENCE_VOLTAGE_SEL,
val, 1);
if (ret)
return ret;
ret = ad3552r_get_drive_strength(st->dev, &val);
if (!ret) {
ret = ad3552r_qspi_update_reg_bits(st,
AD3552R_REG_ADDR_INTERFACE_CONFIG_D,
AD3552R_MASK_SDO_DRIVE_STRENGTH,
val, 1);
if (ret)
return ret;
}
device_for_each_child_node_scoped(st->dev, child) {
ret = fwnode_property_read_u32(child, "reg", &ch);
if (ret)
return dev_err_probe(st->dev, ret,
"reg property missing\n");
ret = ad3552r_get_output_range(st->dev, st->model_data, child,
&range);
if (ret && ret != -ENOENT)
return ret;
if (ret == -ENOENT) {
ret = ad3552r_get_custom_gain(st->dev, child,
&st->ch_data[ch].p,
&st->ch_data[ch].n,
&st->ch_data[ch].rfb,
&st->ch_data[ch].gain_offset);
if (ret)
return ret;
gain = ad3552r_calc_custom_gain(st->ch_data[ch].p,
st->ch_data[ch].n,
st->ch_data[ch].gain_offset);
offset = abs(st->ch_data[ch].gain_offset);
st->ch_data[ch].range_override = 1;
ret = ad3552r_hs_setup_custom_gain(st, ch, gain,
offset);
if (ret)
return ret;
} else {
st->ch_data[ch].range = range;
ret = ad3552r_hs_set_output_range(st, ch, range);
if (ret)
return ret;
}
ad3552r_calc_gain_and_offset(&st->ch_data[ch], st->model_data);
}
return 0;
}
static const struct iio_buffer_setup_ops ad3552r_hs_buffer_setup_ops = {
.postenable = ad3552r_hs_buffer_postenable,
.predisable = ad3552r_hs_buffer_predisable,
};
#define AD3552R_CHANNEL(ch) { \
.type = IIO_VOLTAGE, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
BIT(IIO_CHAN_INFO_SCALE) | \
BIT(IIO_CHAN_INFO_OFFSET), \
.output = 1, \
.indexed = 1, \
.channel = (ch), \
.scan_index = (ch), \
.scan_type = { \
.sign = 'u', \
.realbits = 16, \
.storagebits = 16, \
.endianness = IIO_BE, \
} \
}
static const struct iio_chan_spec ad3552r_hs_channels[] = {
AD3552R_CHANNEL(0),
AD3552R_CHANNEL(1),
};
static const struct iio_info ad3552r_hs_info = {
.read_raw = &ad3552r_hs_read_raw,
.write_raw = &ad3552r_hs_write_raw,
};
static int ad3552r_hs_probe(struct platform_device *pdev)
{
struct ad3552r_hs_state *st;
struct iio_dev *indio_dev;
int ret;
indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*st));
if (!indio_dev)
return -ENOMEM;
st = iio_priv(indio_dev);
st->dev = &pdev->dev;
st->data = dev_get_platdata(st->dev);
if (!st->data)
return dev_err_probe(st->dev, -ENODEV, "No platform data !");
st->back = devm_iio_backend_get(&pdev->dev, NULL);
if (IS_ERR(st->back))
return PTR_ERR(st->back);
ret = devm_iio_backend_enable(&pdev->dev, st->back);
if (ret)
return ret;
st->model_data = device_get_match_data(&pdev->dev);
if (!st->model_data)
return -ENODEV;
indio_dev->name = "ad3552r";
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->setup_ops = &ad3552r_hs_buffer_setup_ops;
indio_dev->channels = ad3552r_hs_channels;
indio_dev->num_channels = ARRAY_SIZE(ad3552r_hs_channels);
indio_dev->info = &ad3552r_hs_info;
ret = devm_iio_backend_request_buffer(&pdev->dev, st->back, indio_dev);
if (ret)
return ret;
ret = ad3552r_hs_setup(st);
if (ret)
return ret;
return devm_iio_device_register(&pdev->dev, indio_dev);
}
static const struct ad3552r_model_data ad3552r_model_data = {
.model_name = "ad3552r",
.chip_id = AD3552R_ID,
.num_hw_channels = 2,
.ranges_table = ad3552r_ch_ranges,
.num_ranges = ARRAY_SIZE(ad3552r_ch_ranges),
};
static const struct of_device_id ad3552r_hs_of_id[] = {
{ .compatible = "adi,ad3552r", .data = &ad3552r_model_data },
{ }
};
MODULE_DEVICE_TABLE(of, ad3552r_hs_of_id);
static struct platform_driver ad3552r_hs_driver = {
.driver = {
.name = "ad3552r-hs",
.of_match_table = ad3552r_hs_of_id,
},
.probe = ad3552r_hs_probe,
};
module_platform_driver(ad3552r_hs_driver);
MODULE_AUTHOR("Dragos Bogdan <dragos.bogdan@analog.com>");
MODULE_AUTHOR("Angelo Dureghello <adueghello@baylibre.com>");
MODULE_DESCRIPTION("AD3552R Driver - High Speed version");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(IIO_BACKEND);
MODULE_IMPORT_NS(IIO_AD3552R);
|