1 /*
2 * Driver for ADI Direct Digital Synthesis ad9910
3 *
4 * Copyright (c) 2010 Analog Devices Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 */
11 #include <linux/types.h>
12 #include <linux/mutex.h>
13 #include <linux/device.h>
14 #include <linux/spi/spi.h>
15 #include <linux/slab.h>
16 #include <linux/sysfs.h>
17 #include <linux/module.h>
18
19 #include "../iio.h"
20 #include "../sysfs.h"
21
22 #define DRV_NAME "ad9910"
23
24 #define CFR1 0x0
25 #define CFR2 0x1
26 #define CFR3 0x2
27
28 #define AUXDAC 0x3
29 #define IOUPD 0x4
30 #define FTW 0x7
31 #define POW 0x8
32 #define ASF 0x9
33 #define MULTC 0x0A
34 #define DIG_RAMPL 0x0B
35 #define DIG_RAMPS 0x0C
36 #define DIG_RAMPR 0x0D
37 #define SIN_TONEP0 0x0E
38 #define SIN_TONEP1 0x0F
39 #define SIN_TONEP2 0x10
40 #define SIN_TONEP3 0x11
41 #define SIN_TONEP4 0x12
42 #define SIN_TONEP5 0x13
43 #define SIN_TONEP6 0x14
44 #define SIN_TONEP7 0x15
45
46 #define RAM_ENABLE (1 << 7)
47
48 #define MANUAL_OSK (1 << 7)
49 #define INVSIC (1 << 6)
50 #define DDS_SINEOP (1)
51
52 #define AUTO_OSK (1)
53 #define OSKEN (1 << 1)
54 #define LOAD_ARR (1 << 2)
55 #define CLR_PHA (1 << 3)
56 #define CLR_DIG (1 << 4)
57 #define ACLR_PHA (1 << 5)
58 #define ACLR_DIG (1 << 6)
59 #define LOAD_LRR (1 << 7)
60
61 #define LSB_FST (1)
62 #define SDIO_IPT (1 << 1)
63 #define EXT_PWD (1 << 3)
64 #define ADAC_PWD (1 << 4)
65 #define REFCLK_PWD (1 << 5)
66 #define DAC_PWD (1 << 6)
67 #define DIG_PWD (1 << 7)
68
69 #define ENA_AMP (1)
70 #define READ_FTW (1)
71 #define DIGR_LOW (1 << 1)
72 #define DIGR_HIGH (1 << 2)
73 #define DIGR_ENA (1 << 3)
74 #define SYNCCLK_ENA (1 << 6)
75 #define ITER_IOUPD (1 << 7)
76
77 #define TX_ENA (1 << 1)
78 #define PDCLK_INV (1 << 2)
79 #define PDCLK_ENB (1 << 3)
80
81 #define PARA_ENA (1 << 4)
82 #define SYNC_DIS (1 << 5)
83 #define DATA_ASS (1 << 6)
84 #define MATCH_ENA (1 << 7)
85
86 #define PLL_ENA (1)
87 #define PFD_RST (1 << 2)
88 #define REFCLK_RST (1 << 6)
89 #define REFCLK_BYP (1 << 7)
90
91 /* Register format: 1 byte addr + value */
92 struct ad9910_config {
93 u8 auxdac[5];
94 u8 ioupd[5];
95 u8 ftw[5];
96 u8 pow[3];
97 u8 asf[5];
98 u8 multc[5];
99 u8 dig_rampl[9];
100 u8 dig_ramps[9];
101 u8 dig_rampr[5];
102 u8 sin_tonep0[9];
103 u8 sin_tonep1[9];
104 u8 sin_tonep2[9];
105 u8 sin_tonep3[9];
106 u8 sin_tonep4[9];
107 u8 sin_tonep5[9];
108 u8 sin_tonep6[9];
109 u8 sin_tonep7[9];
110 };
111
112 struct ad9910_state {
113 struct mutex lock;
114 struct spi_device *sdev;
115 };
116
ad9910_set_parameter(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)117 static ssize_t ad9910_set_parameter(struct device *dev,
118 struct device_attribute *attr,
119 const char *buf,
120 size_t len)
121 {
122 struct spi_message msg;
123 struct spi_transfer xfer;
124 int ret;
125 struct ad9910_config *config = (struct ad9910_config *)buf;
126 struct iio_dev *idev = dev_get_drvdata(dev);
127 struct ad9910_state *st = iio_priv(idev);
128
129 xfer.len = 5;
130 xfer.tx_buf = &config->auxdac[0];
131 mutex_lock(&st->lock);
132
133 spi_message_init(&msg);
134 spi_message_add_tail(&xfer, &msg);
135 ret = spi_sync(st->sdev, &msg);
136 if (ret)
137 goto error_ret;
138
139 xfer.len = 5;
140 xfer.tx_buf = &config->ioupd[0];
141
142 spi_message_init(&msg);
143 spi_message_add_tail(&xfer, &msg);
144 ret = spi_sync(st->sdev, &msg);
145 if (ret)
146 goto error_ret;
147
148 xfer.len = 5;
149 xfer.tx_buf = &config->ftw[0];
150
151 spi_message_init(&msg);
152 spi_message_add_tail(&xfer, &msg);
153 ret = spi_sync(st->sdev, &msg);
154 if (ret)
155 goto error_ret;
156
157 xfer.len = 3;
158 xfer.tx_buf = &config->pow[0];
159
160 spi_message_init(&msg);
161 spi_message_add_tail(&xfer, &msg);
162 ret = spi_sync(st->sdev, &msg);
163 if (ret)
164 goto error_ret;
165
166 xfer.len = 5;
167 xfer.tx_buf = &config->asf[0];
168
169 spi_message_init(&msg);
170 spi_message_add_tail(&xfer, &msg);
171 ret = spi_sync(st->sdev, &msg);
172 if (ret)
173 goto error_ret;
174
175 xfer.len = 5;
176 xfer.tx_buf = &config->multc[0];
177
178 spi_message_init(&msg);
179 spi_message_add_tail(&xfer, &msg);
180 ret = spi_sync(st->sdev, &msg);
181 if (ret)
182 goto error_ret;
183
184 xfer.len = 9;
185 xfer.tx_buf = &config->dig_rampl[0];
186
187 spi_message_init(&msg);
188 spi_message_add_tail(&xfer, &msg);
189 ret = spi_sync(st->sdev, &msg);
190 if (ret)
191 goto error_ret;
192
193 xfer.len = 9;
194 xfer.tx_buf = &config->dig_ramps[0];
195
196 spi_message_init(&msg);
197 spi_message_add_tail(&xfer, &msg);
198 ret = spi_sync(st->sdev, &msg);
199 if (ret)
200 goto error_ret;
201
202 xfer.len = 5;
203 xfer.tx_buf = &config->dig_rampr[0];
204
205 spi_message_init(&msg);
206 spi_message_add_tail(&xfer, &msg);
207 ret = spi_sync(st->sdev, &msg);
208 if (ret)
209 goto error_ret;
210
211 xfer.len = 9;
212 xfer.tx_buf = &config->sin_tonep0[0];
213
214 spi_message_init(&msg);
215 spi_message_add_tail(&xfer, &msg);
216 ret = spi_sync(st->sdev, &msg);
217 if (ret)
218 goto error_ret;
219
220 xfer.len = 9;
221 xfer.tx_buf = &config->sin_tonep1[0];
222
223 spi_message_init(&msg);
224 spi_message_add_tail(&xfer, &msg);
225 ret = spi_sync(st->sdev, &msg);
226 if (ret)
227 goto error_ret;
228
229 xfer.len = 9;
230 xfer.tx_buf = &config->sin_tonep2[0];
231
232 spi_message_init(&msg);
233 spi_message_add_tail(&xfer, &msg);
234 ret = spi_sync(st->sdev, &msg);
235 if (ret)
236 goto error_ret;
237 xfer.len = 9;
238 xfer.tx_buf = &config->sin_tonep3[0];
239
240 spi_message_init(&msg);
241 spi_message_add_tail(&xfer, &msg);
242 ret = spi_sync(st->sdev, &msg);
243 if (ret)
244 goto error_ret;
245
246 xfer.len = 9;
247 xfer.tx_buf = &config->sin_tonep4[0];
248
249 spi_message_init(&msg);
250 spi_message_add_tail(&xfer, &msg);
251 ret = spi_sync(st->sdev, &msg);
252 if (ret)
253 goto error_ret;
254
255 xfer.len = 9;
256 xfer.tx_buf = &config->sin_tonep5[0];
257
258 spi_message_init(&msg);
259 spi_message_add_tail(&xfer, &msg);
260 ret = spi_sync(st->sdev, &msg);
261 if (ret)
262 goto error_ret;
263
264 xfer.len = 9;
265 xfer.tx_buf = &config->sin_tonep6[0];
266
267 spi_message_init(&msg);
268 spi_message_add_tail(&xfer, &msg);
269 ret = spi_sync(st->sdev, &msg);
270 if (ret)
271 goto error_ret;
272
273 xfer.len = 9;
274 xfer.tx_buf = &config->sin_tonep7[0];
275
276 spi_message_init(&msg);
277 spi_message_add_tail(&xfer, &msg);
278 ret = spi_sync(st->sdev, &msg);
279 if (ret)
280 goto error_ret;
281 error_ret:
282 mutex_unlock(&st->lock);
283
284 return ret ? ret : len;
285 }
286
287 static IIO_DEVICE_ATTR(dds, S_IWUSR, NULL, ad9910_set_parameter, 0);
288
ad9910_init(struct ad9910_state * st)289 static void ad9910_init(struct ad9910_state *st)
290 {
291 struct spi_message msg;
292 struct spi_transfer xfer;
293 int ret;
294 u8 cfr[5];
295
296 cfr[0] = CFR1;
297 cfr[1] = 0;
298 cfr[2] = MANUAL_OSK | INVSIC | DDS_SINEOP;
299 cfr[3] = AUTO_OSK | OSKEN | ACLR_PHA | ACLR_DIG | LOAD_LRR;
300 cfr[4] = 0;
301
302 mutex_lock(&st->lock);
303
304 xfer.len = 5;
305 xfer.tx_buf = 𝔠
306
307 spi_message_init(&msg);
308 spi_message_add_tail(&xfer, &msg);
309 ret = spi_sync(st->sdev, &msg);
310 if (ret)
311 goto error_ret;
312
313 cfr[0] = CFR2;
314 cfr[1] = ENA_AMP;
315 cfr[2] = READ_FTW | DIGR_ENA | ITER_IOUPD;
316 cfr[3] = TX_ENA | PDCLK_INV | PDCLK_ENB;
317 cfr[4] = PARA_ENA;
318
319 xfer.len = 5;
320 xfer.tx_buf = 𝔠
321
322 spi_message_init(&msg);
323 spi_message_add_tail(&xfer, &msg);
324 ret = spi_sync(st->sdev, &msg);
325 if (ret)
326 goto error_ret;
327
328 cfr[0] = CFR3;
329 cfr[1] = PLL_ENA;
330 cfr[2] = 0;
331 cfr[3] = REFCLK_RST | REFCLK_BYP;
332 cfr[4] = 0;
333
334 xfer.len = 5;
335 xfer.tx_buf = 𝔠
336
337 spi_message_init(&msg);
338 spi_message_add_tail(&xfer, &msg);
339 ret = spi_sync(st->sdev, &msg);
340 if (ret)
341 goto error_ret;
342
343 error_ret:
344 mutex_unlock(&st->lock);
345
346
347
348 }
349
350 static struct attribute *ad9910_attributes[] = {
351 &iio_dev_attr_dds.dev_attr.attr,
352 NULL,
353 };
354
355 static const struct attribute_group ad9910_attribute_group = {
356 .attrs = ad9910_attributes,
357 };
358
359 static const struct iio_info ad9910_info = {
360 .attrs = &ad9910_attribute_group,
361 .driver_module = THIS_MODULE,
362 };
363
ad9910_probe(struct spi_device * spi)364 static int __devinit ad9910_probe(struct spi_device *spi)
365 {
366 struct ad9910_state *st;
367 struct iio_dev *idev;
368 int ret = 0;
369
370 idev = iio_allocate_device(sizeof(*st));
371 if (idev == NULL) {
372 ret = -ENOMEM;
373 goto error_ret;
374 }
375 spi_set_drvdata(spi, idev);
376 st = iio_priv(idev);
377 mutex_init(&st->lock);
378 st->sdev = spi;
379
380 idev->dev.parent = &spi->dev;
381 idev->info = &ad9910_info;
382 idev->modes = INDIO_DIRECT_MODE;
383
384 ret = iio_device_register(idev);
385 if (ret)
386 goto error_free_dev;
387 spi->max_speed_hz = 2000000;
388 spi->mode = SPI_MODE_3;
389 spi->bits_per_word = 8;
390 spi_setup(spi);
391 ad9910_init(st);
392 return 0;
393
394 error_free_dev:
395 iio_free_device(idev);
396 error_ret:
397 return ret;
398 }
399
ad9910_remove(struct spi_device * spi)400 static int __devexit ad9910_remove(struct spi_device *spi)
401 {
402 iio_device_unregister(spi_get_drvdata(spi));
403 iio_free_device(spi_get_drvdata(spi));
404
405 return 0;
406 }
407
408 static struct spi_driver ad9910_driver = {
409 .driver = {
410 .name = DRV_NAME,
411 .owner = THIS_MODULE,
412 },
413 .probe = ad9910_probe,
414 .remove = __devexit_p(ad9910_remove),
415 };
416 module_spi_driver(ad9910_driver);
417
418 MODULE_AUTHOR("Cliff Cai");
419 MODULE_DESCRIPTION("Analog Devices ad9910 driver");
420 MODULE_LICENSE("GPL v2");
421 MODULE_ALIAS("spi:" DRV_NAME);
422