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8#include <asm/div64.h>
9
10#include <linux/clk.h>
11#include <linux/device.h>
12#include <linux/err.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/regulator/consumer.h>
16#include <linux/slab.h>
17#include <linux/spi/spi.h>
18#include <linux/sysfs.h>
19
20#include <linux/iio/iio.h>
21#include <linux/iio/sysfs.h>
22
23#include "ad9832.h"
24
25#include "dds.h"
26
27
28
29#define AD9832_FREQ0LL 0x0
30#define AD9832_FREQ0HL 0x1
31#define AD9832_FREQ0LM 0x2
32#define AD9832_FREQ0HM 0x3
33#define AD9832_FREQ1LL 0x4
34#define AD9832_FREQ1HL 0x5
35#define AD9832_FREQ1LM 0x6
36#define AD9832_FREQ1HM 0x7
37#define AD9832_PHASE0L 0x8
38#define AD9832_PHASE0H 0x9
39#define AD9832_PHASE1L 0xA
40#define AD9832_PHASE1H 0xB
41#define AD9832_PHASE2L 0xC
42#define AD9832_PHASE2H 0xD
43#define AD9832_PHASE3L 0xE
44#define AD9832_PHASE3H 0xF
45
46#define AD9832_PHASE_SYM 0x10
47#define AD9832_FREQ_SYM 0x11
48#define AD9832_PINCTRL_EN 0x12
49#define AD9832_OUTPUT_EN 0x13
50
51
52
53#define AD9832_CMD_PHA8BITSW 0x1
54#define AD9832_CMD_PHA16BITSW 0x0
55#define AD9832_CMD_FRE8BITSW 0x3
56#define AD9832_CMD_FRE16BITSW 0x2
57#define AD9832_CMD_FPSELECT 0x6
58#define AD9832_CMD_SYNCSELSRC 0x8
59#define AD9832_CMD_SLEEPRESCLR 0xC
60
61#define AD9832_FREQ BIT(11)
62#define AD9832_PHASE(x) (((x) & 3) << 9)
63#define AD9832_SYNC BIT(13)
64#define AD9832_SELSRC BIT(12)
65#define AD9832_SLEEP BIT(13)
66#define AD9832_RESET BIT(12)
67#define AD9832_CLR BIT(11)
68#define CMD_SHIFT 12
69#define ADD_SHIFT 8
70#define AD9832_FREQ_BITS 32
71#define AD9832_PHASE_BITS 12
72#define RES_MASK(bits) ((1 << (bits)) - 1)
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95struct ad9832_state {
96 struct spi_device *spi;
97 struct regulator *avdd;
98 struct regulator *dvdd;
99 struct clk *mclk;
100 unsigned short ctrl_fp;
101 unsigned short ctrl_ss;
102 unsigned short ctrl_src;
103 struct spi_transfer xfer;
104 struct spi_message msg;
105 struct spi_transfer freq_xfer[4];
106 struct spi_message freq_msg;
107 struct spi_transfer phase_xfer[2];
108 struct spi_message phase_msg;
109 struct mutex lock;
110
111
112
113
114 union {
115 __be16 freq_data[4]____cacheline_aligned;
116 __be16 phase_data[2];
117 __be16 data;
118 };
119};
120
121static unsigned long ad9832_calc_freqreg(unsigned long mclk, unsigned long fout)
122{
123 unsigned long long freqreg = (u64)fout *
124 (u64)((u64)1L << AD9832_FREQ_BITS);
125 do_div(freqreg, mclk);
126 return freqreg;
127}
128
129static int ad9832_write_frequency(struct ad9832_state *st,
130 unsigned int addr, unsigned long fout)
131{
132 unsigned long regval;
133
134 if (fout > (clk_get_rate(st->mclk) / 2))
135 return -EINVAL;
136
137 regval = ad9832_calc_freqreg(clk_get_rate(st->mclk), fout);
138
139 st->freq_data[0] = cpu_to_be16((AD9832_CMD_FRE8BITSW << CMD_SHIFT) |
140 (addr << ADD_SHIFT) |
141 ((regval >> 24) & 0xFF));
142 st->freq_data[1] = cpu_to_be16((AD9832_CMD_FRE16BITSW << CMD_SHIFT) |
143 ((addr - 1) << ADD_SHIFT) |
144 ((regval >> 16) & 0xFF));
145 st->freq_data[2] = cpu_to_be16((AD9832_CMD_FRE8BITSW << CMD_SHIFT) |
146 ((addr - 2) << ADD_SHIFT) |
147 ((regval >> 8) & 0xFF));
148 st->freq_data[3] = cpu_to_be16((AD9832_CMD_FRE16BITSW << CMD_SHIFT) |
149 ((addr - 3) << ADD_SHIFT) |
150 ((regval >> 0) & 0xFF));
151
152 return spi_sync(st->spi, &st->freq_msg);
153}
154
155static int ad9832_write_phase(struct ad9832_state *st,
156 unsigned long addr, unsigned long phase)
157{
158 if (phase > BIT(AD9832_PHASE_BITS))
159 return -EINVAL;
160
161 st->phase_data[0] = cpu_to_be16((AD9832_CMD_PHA8BITSW << CMD_SHIFT) |
162 (addr << ADD_SHIFT) |
163 ((phase >> 8) & 0xFF));
164 st->phase_data[1] = cpu_to_be16((AD9832_CMD_PHA16BITSW << CMD_SHIFT) |
165 ((addr - 1) << ADD_SHIFT) |
166 (phase & 0xFF));
167
168 return spi_sync(st->spi, &st->phase_msg);
169}
170
171static ssize_t ad9832_write(struct device *dev, struct device_attribute *attr,
172 const char *buf, size_t len)
173{
174 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
175 struct ad9832_state *st = iio_priv(indio_dev);
176 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
177 int ret;
178 unsigned long val;
179
180 ret = kstrtoul(buf, 10, &val);
181 if (ret)
182 goto error_ret;
183
184 mutex_lock(&st->lock);
185 switch ((u32)this_attr->address) {
186 case AD9832_FREQ0HM:
187 case AD9832_FREQ1HM:
188 ret = ad9832_write_frequency(st, this_attr->address, val);
189 break;
190 case AD9832_PHASE0H:
191 case AD9832_PHASE1H:
192 case AD9832_PHASE2H:
193 case AD9832_PHASE3H:
194 ret = ad9832_write_phase(st, this_attr->address, val);
195 break;
196 case AD9832_PINCTRL_EN:
197 if (val)
198 st->ctrl_ss &= ~AD9832_SELSRC;
199 else
200 st->ctrl_ss |= AD9832_SELSRC;
201 st->data = cpu_to_be16((AD9832_CMD_SYNCSELSRC << CMD_SHIFT) |
202 st->ctrl_ss);
203 ret = spi_sync(st->spi, &st->msg);
204 break;
205 case AD9832_FREQ_SYM:
206 if (val == 1) {
207 st->ctrl_fp |= AD9832_FREQ;
208 } else if (val == 0) {
209 st->ctrl_fp &= ~AD9832_FREQ;
210 } else {
211 ret = -EINVAL;
212 break;
213 }
214 st->data = cpu_to_be16((AD9832_CMD_FPSELECT << CMD_SHIFT) |
215 st->ctrl_fp);
216 ret = spi_sync(st->spi, &st->msg);
217 break;
218 case AD9832_PHASE_SYM:
219 if (val > 3) {
220 ret = -EINVAL;
221 break;
222 }
223
224 st->ctrl_fp &= ~AD9832_PHASE(3);
225 st->ctrl_fp |= AD9832_PHASE(val);
226
227 st->data = cpu_to_be16((AD9832_CMD_FPSELECT << CMD_SHIFT) |
228 st->ctrl_fp);
229 ret = spi_sync(st->spi, &st->msg);
230 break;
231 case AD9832_OUTPUT_EN:
232 if (val)
233 st->ctrl_src &= ~(AD9832_RESET | AD9832_SLEEP |
234 AD9832_CLR);
235 else
236 st->ctrl_src |= AD9832_RESET;
237
238 st->data = cpu_to_be16((AD9832_CMD_SLEEPRESCLR << CMD_SHIFT) |
239 st->ctrl_src);
240 ret = spi_sync(st->spi, &st->msg);
241 break;
242 default:
243 ret = -ENODEV;
244 }
245 mutex_unlock(&st->lock);
246
247error_ret:
248 return ret ? ret : len;
249}
250
251
252
253
254
255static IIO_DEV_ATTR_FREQ(0, 0, 0200, NULL, ad9832_write, AD9832_FREQ0HM);
256static IIO_DEV_ATTR_FREQ(0, 1, 0200, NULL, ad9832_write, AD9832_FREQ1HM);
257static IIO_DEV_ATTR_FREQSYMBOL(0, 0200, NULL, ad9832_write, AD9832_FREQ_SYM);
258static IIO_CONST_ATTR_FREQ_SCALE(0, "1");
259
260static IIO_DEV_ATTR_PHASE(0, 0, 0200, NULL, ad9832_write, AD9832_PHASE0H);
261static IIO_DEV_ATTR_PHASE(0, 1, 0200, NULL, ad9832_write, AD9832_PHASE1H);
262static IIO_DEV_ATTR_PHASE(0, 2, 0200, NULL, ad9832_write, AD9832_PHASE2H);
263static IIO_DEV_ATTR_PHASE(0, 3, 0200, NULL, ad9832_write, AD9832_PHASE3H);
264static IIO_DEV_ATTR_PHASESYMBOL(0, 0200, NULL,
265 ad9832_write, AD9832_PHASE_SYM);
266static IIO_CONST_ATTR_PHASE_SCALE(0, "0.0015339808");
267
268static IIO_DEV_ATTR_PINCONTROL_EN(0, 0200, NULL,
269 ad9832_write, AD9832_PINCTRL_EN);
270static IIO_DEV_ATTR_OUT_ENABLE(0, 0200, NULL,
271 ad9832_write, AD9832_OUTPUT_EN);
272
273static struct attribute *ad9832_attributes[] = {
274 &iio_dev_attr_out_altvoltage0_frequency0.dev_attr.attr,
275 &iio_dev_attr_out_altvoltage0_frequency1.dev_attr.attr,
276 &iio_const_attr_out_altvoltage0_frequency_scale.dev_attr.attr,
277 &iio_dev_attr_out_altvoltage0_phase0.dev_attr.attr,
278 &iio_dev_attr_out_altvoltage0_phase1.dev_attr.attr,
279 &iio_dev_attr_out_altvoltage0_phase2.dev_attr.attr,
280 &iio_dev_attr_out_altvoltage0_phase3.dev_attr.attr,
281 &iio_const_attr_out_altvoltage0_phase_scale.dev_attr.attr,
282 &iio_dev_attr_out_altvoltage0_pincontrol_en.dev_attr.attr,
283 &iio_dev_attr_out_altvoltage0_frequencysymbol.dev_attr.attr,
284 &iio_dev_attr_out_altvoltage0_phasesymbol.dev_attr.attr,
285 &iio_dev_attr_out_altvoltage0_out_enable.dev_attr.attr,
286 NULL,
287};
288
289static const struct attribute_group ad9832_attribute_group = {
290 .attrs = ad9832_attributes,
291};
292
293static const struct iio_info ad9832_info = {
294 .attrs = &ad9832_attribute_group,
295};
296
297static int ad9832_probe(struct spi_device *spi)
298{
299 struct ad9832_platform_data *pdata = dev_get_platdata(&spi->dev);
300 struct iio_dev *indio_dev;
301 struct ad9832_state *st;
302 int ret;
303
304 if (!pdata) {
305 dev_dbg(&spi->dev, "no platform data?\n");
306 return -ENODEV;
307 }
308
309 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
310 if (!indio_dev)
311 return -ENOMEM;
312
313 spi_set_drvdata(spi, indio_dev);
314 st = iio_priv(indio_dev);
315
316 st->avdd = devm_regulator_get(&spi->dev, "avdd");
317 if (IS_ERR(st->avdd))
318 return PTR_ERR(st->avdd);
319
320 ret = regulator_enable(st->avdd);
321 if (ret) {
322 dev_err(&spi->dev, "Failed to enable specified AVDD supply\n");
323 return ret;
324 }
325
326 st->dvdd = devm_regulator_get(&spi->dev, "dvdd");
327 if (IS_ERR(st->dvdd)) {
328 ret = PTR_ERR(st->dvdd);
329 goto error_disable_avdd;
330 }
331
332 ret = regulator_enable(st->dvdd);
333 if (ret) {
334 dev_err(&spi->dev, "Failed to enable specified DVDD supply\n");
335 goto error_disable_avdd;
336 }
337
338 st->mclk = devm_clk_get(&spi->dev, "mclk");
339 if (IS_ERR(st->mclk)) {
340 ret = PTR_ERR(st->mclk);
341 goto error_disable_dvdd;
342 }
343
344 ret = clk_prepare_enable(st->mclk);
345 if (ret < 0)
346 goto error_disable_dvdd;
347
348 st->spi = spi;
349 mutex_init(&st->lock);
350
351 indio_dev->name = spi_get_device_id(spi)->name;
352 indio_dev->info = &ad9832_info;
353 indio_dev->modes = INDIO_DIRECT_MODE;
354
355
356
357 st->xfer.tx_buf = &st->data;
358 st->xfer.len = 2;
359
360 spi_message_init(&st->msg);
361 spi_message_add_tail(&st->xfer, &st->msg);
362
363 st->freq_xfer[0].tx_buf = &st->freq_data[0];
364 st->freq_xfer[0].len = 2;
365 st->freq_xfer[0].cs_change = 1;
366 st->freq_xfer[1].tx_buf = &st->freq_data[1];
367 st->freq_xfer[1].len = 2;
368 st->freq_xfer[1].cs_change = 1;
369 st->freq_xfer[2].tx_buf = &st->freq_data[2];
370 st->freq_xfer[2].len = 2;
371 st->freq_xfer[2].cs_change = 1;
372 st->freq_xfer[3].tx_buf = &st->freq_data[3];
373 st->freq_xfer[3].len = 2;
374
375 spi_message_init(&st->freq_msg);
376 spi_message_add_tail(&st->freq_xfer[0], &st->freq_msg);
377 spi_message_add_tail(&st->freq_xfer[1], &st->freq_msg);
378 spi_message_add_tail(&st->freq_xfer[2], &st->freq_msg);
379 spi_message_add_tail(&st->freq_xfer[3], &st->freq_msg);
380
381 st->phase_xfer[0].tx_buf = &st->phase_data[0];
382 st->phase_xfer[0].len = 2;
383 st->phase_xfer[0].cs_change = 1;
384 st->phase_xfer[1].tx_buf = &st->phase_data[1];
385 st->phase_xfer[1].len = 2;
386
387 spi_message_init(&st->phase_msg);
388 spi_message_add_tail(&st->phase_xfer[0], &st->phase_msg);
389 spi_message_add_tail(&st->phase_xfer[1], &st->phase_msg);
390
391 st->ctrl_src = AD9832_SLEEP | AD9832_RESET | AD9832_CLR;
392 st->data = cpu_to_be16((AD9832_CMD_SLEEPRESCLR << CMD_SHIFT) |
393 st->ctrl_src);
394 ret = spi_sync(st->spi, &st->msg);
395 if (ret) {
396 dev_err(&spi->dev, "device init failed\n");
397 goto error_unprepare_mclk;
398 }
399
400 ret = ad9832_write_frequency(st, AD9832_FREQ0HM, pdata->freq0);
401 if (ret)
402 goto error_unprepare_mclk;
403
404 ret = ad9832_write_frequency(st, AD9832_FREQ1HM, pdata->freq1);
405 if (ret)
406 goto error_unprepare_mclk;
407
408 ret = ad9832_write_phase(st, AD9832_PHASE0H, pdata->phase0);
409 if (ret)
410 goto error_unprepare_mclk;
411
412 ret = ad9832_write_phase(st, AD9832_PHASE1H, pdata->phase1);
413 if (ret)
414 goto error_unprepare_mclk;
415
416 ret = ad9832_write_phase(st, AD9832_PHASE2H, pdata->phase2);
417 if (ret)
418 goto error_unprepare_mclk;
419
420 ret = ad9832_write_phase(st, AD9832_PHASE3H, pdata->phase3);
421 if (ret)
422 goto error_unprepare_mclk;
423
424 ret = iio_device_register(indio_dev);
425 if (ret)
426 goto error_unprepare_mclk;
427
428 return 0;
429
430error_unprepare_mclk:
431 clk_disable_unprepare(st->mclk);
432error_disable_dvdd:
433 regulator_disable(st->dvdd);
434error_disable_avdd:
435 regulator_disable(st->avdd);
436
437 return ret;
438}
439
440static int ad9832_remove(struct spi_device *spi)
441{
442 struct iio_dev *indio_dev = spi_get_drvdata(spi);
443 struct ad9832_state *st = iio_priv(indio_dev);
444
445 iio_device_unregister(indio_dev);
446 clk_disable_unprepare(st->mclk);
447 regulator_disable(st->dvdd);
448 regulator_disable(st->avdd);
449
450 return 0;
451}
452
453static const struct spi_device_id ad9832_id[] = {
454 {"ad9832", 0},
455 {"ad9835", 0},
456 {}
457};
458MODULE_DEVICE_TABLE(spi, ad9832_id);
459
460static struct spi_driver ad9832_driver = {
461 .driver = {
462 .name = "ad9832",
463 },
464 .probe = ad9832_probe,
465 .remove = ad9832_remove,
466 .id_table = ad9832_id,
467};
468module_spi_driver(ad9832_driver);
469
470MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
471MODULE_DESCRIPTION("Analog Devices AD9832/AD9835 DDS");
472MODULE_LICENSE("GPL v2");
473
