1
2
3
4
5
6
7
8
9#include <linux/interrupt.h>
10#include <linux/workqueue.h>
11#include <linux/device.h>
12#include <linux/kernel.h>
13#include <linux/slab.h>
14#include <linux/sysfs.h>
15#include <linux/list.h>
16#include <linux/spi/spi.h>
17#include <linux/regulator/consumer.h>
18#include <linux/err.h>
19#include <asm/div64.h>
20
21#include "../iio.h"
22#include "../sysfs.h"
23#include "dds.h"
24
25#include "ad9834.h"
26
27static unsigned int ad9834_calc_freqreg(unsigned long mclk, unsigned long fout)
28{
29 unsigned long long freqreg = (u64) fout * (u64) (1 << AD9834_FREQ_BITS);
30 do_div(freqreg, mclk);
31 return freqreg;
32}
33
34static int ad9834_write_frequency(struct ad9834_state *st,
35 unsigned long addr, unsigned long fout)
36{
37 unsigned long regval;
38
39 if (fout > (st->mclk / 2))
40 return -EINVAL;
41
42 regval = ad9834_calc_freqreg(st->mclk, fout);
43
44 st->freq_data[0] = cpu_to_be16(addr | (regval &
45 RES_MASK(AD9834_FREQ_BITS / 2)));
46 st->freq_data[1] = cpu_to_be16(addr | ((regval >>
47 (AD9834_FREQ_BITS / 2)) &
48 RES_MASK(AD9834_FREQ_BITS / 2)));
49
50 return spi_sync(st->spi, &st->freq_msg);;
51}
52
53static int ad9834_write_phase(struct ad9834_state *st,
54 unsigned long addr, unsigned long phase)
55{
56 if (phase > (1 << AD9834_PHASE_BITS))
57 return -EINVAL;
58 st->data = cpu_to_be16(addr | phase);
59
60 return spi_sync(st->spi, &st->msg);
61}
62
63static ssize_t ad9834_write(struct device *dev,
64 struct device_attribute *attr,
65 const char *buf,
66 size_t len)
67{
68 struct iio_dev *dev_info = dev_get_drvdata(dev);
69 struct ad9834_state *st = dev_info->dev_data;
70 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
71 int ret;
72 long val;
73
74 ret = strict_strtoul(buf, 10, &val);
75 if (ret)
76 goto error_ret;
77
78 mutex_lock(&dev_info->mlock);
79 switch (this_attr->address) {
80 case AD9834_REG_FREQ0:
81 case AD9834_REG_FREQ1:
82 ret = ad9834_write_frequency(st, this_attr->address, val);
83 break;
84 case AD9834_REG_PHASE0:
85 case AD9834_REG_PHASE1:
86 ret = ad9834_write_phase(st, this_attr->address, val);
87 break;
88 case AD9834_OPBITEN:
89 if (st->control & AD9834_MODE) {
90 ret = -EINVAL;
91 break;
92 }
93
94 if (val)
95 st->control |= AD9834_OPBITEN;
96 else
97 st->control &= ~AD9834_OPBITEN;
98
99 st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
100 ret = spi_sync(st->spi, &st->msg);
101 break;
102 case AD9834_PIN_SW:
103 if (val)
104 st->control |= AD9834_PIN_SW;
105 else
106 st->control &= ~AD9834_PIN_SW;
107 st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
108 ret = spi_sync(st->spi, &st->msg);
109 break;
110 case AD9834_FSEL:
111 case AD9834_PSEL:
112 if (val == 0)
113 st->control &= ~(this_attr->address | AD9834_PIN_SW);
114 else if (val == 1) {
115 st->control |= this_attr->address;
116 st->control &= ~AD9834_PIN_SW;
117 } else {
118 ret = -EINVAL;
119 break;
120 }
121 st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
122 ret = spi_sync(st->spi, &st->msg);
123 break;
124 case AD9834_RESET:
125 if (val)
126 st->control &= ~AD9834_RESET;
127 else
128 st->control |= AD9834_RESET;
129
130 st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
131 ret = spi_sync(st->spi, &st->msg);
132 break;
133 default:
134 ret = -ENODEV;
135 }
136 mutex_unlock(&dev_info->mlock);
137
138error_ret:
139 return ret ? ret : len;
140}
141
142static ssize_t ad9834_store_wavetype(struct device *dev,
143 struct device_attribute *attr,
144 const char *buf,
145 size_t len)
146{
147 struct iio_dev *dev_info = dev_get_drvdata(dev);
148 struct ad9834_state *st = dev_info->dev_data;
149 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
150 int ret = 0;
151 bool is_ad9833 = st->devid == ID_AD9833;
152
153 mutex_lock(&dev_info->mlock);
154
155 switch (this_attr->address) {
156 case 0:
157 if (sysfs_streq(buf, "sine")) {
158 st->control &= ~AD9834_MODE;
159 if (is_ad9833)
160 st->control &= ~AD9834_OPBITEN;
161 } else if (sysfs_streq(buf, "triangle")) {
162 if (is_ad9833) {
163 st->control &= ~AD9834_OPBITEN;
164 st->control |= AD9834_MODE;
165 } else if (st->control & AD9834_OPBITEN) {
166 ret = -EINVAL;
167 } else {
168 st->control |= AD9834_MODE;
169 }
170 } else if (is_ad9833 && sysfs_streq(buf, "square")) {
171 st->control &= ~AD9834_MODE;
172 st->control |= AD9834_OPBITEN;
173 } else {
174 ret = -EINVAL;
175 }
176
177 break;
178 case 1:
179 if (sysfs_streq(buf, "square") &&
180 !(st->control & AD9834_MODE)) {
181 st->control &= ~AD9834_MODE;
182 st->control |= AD9834_OPBITEN;
183 } else {
184 ret = -EINVAL;
185 }
186 break;
187 default:
188 ret = -EINVAL;
189 break;
190 }
191
192 if (!ret) {
193 st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
194 ret = spi_sync(st->spi, &st->msg);
195 }
196 mutex_unlock(&dev_info->mlock);
197
198 return ret ? ret : len;
199}
200
201static ssize_t ad9834_show_name(struct device *dev,
202 struct device_attribute *attr,
203 char *buf)
204{
205 struct iio_dev *dev_info = dev_get_drvdata(dev);
206 struct ad9834_state *st = iio_dev_get_devdata(dev_info);
207
208 return sprintf(buf, "%s\n", spi_get_device_id(st->spi)->name);
209}
210static IIO_DEVICE_ATTR(name, S_IRUGO, ad9834_show_name, NULL, 0);
211
212static ssize_t ad9834_show_out0_wavetype_available(struct device *dev,
213 struct device_attribute *attr,
214 char *buf)
215{
216 struct iio_dev *dev_info = dev_get_drvdata(dev);
217 struct ad9834_state *st = iio_dev_get_devdata(dev_info);
218 char *str;
219
220 if (st->devid == ID_AD9833)
221 str = "sine triangle square";
222 else if (st->control & AD9834_OPBITEN)
223 str = "sine";
224 else
225 str = "sine triangle";
226
227 return sprintf(buf, "%s\n", str);
228}
229
230
231static IIO_DEVICE_ATTR(dds0_out0_wavetype_available, S_IRUGO,
232 ad9834_show_out0_wavetype_available, NULL, 0);
233
234static ssize_t ad9834_show_out1_wavetype_available(struct device *dev,
235 struct device_attribute *attr,
236 char *buf)
237{
238 struct iio_dev *dev_info = dev_get_drvdata(dev);
239 struct ad9834_state *st = iio_dev_get_devdata(dev_info);
240 char *str;
241
242 if (st->control & AD9834_MODE)
243 str = "";
244 else
245 str = "square";
246
247 return sprintf(buf, "%s\n", str);
248}
249
250static IIO_DEVICE_ATTR(dds0_out1_wavetype_available, S_IRUGO,
251 ad9834_show_out1_wavetype_available, NULL, 0);
252
253
254
255
256
257static IIO_DEV_ATTR_FREQ(0, 0, S_IWUSR, NULL, ad9834_write, AD9834_REG_FREQ0);
258static IIO_DEV_ATTR_FREQ(0, 1, S_IWUSR, NULL, ad9834_write, AD9834_REG_FREQ1);
259static IIO_DEV_ATTR_FREQSYMBOL(0, S_IWUSR, NULL, ad9834_write, AD9834_FSEL);
260static IIO_CONST_ATTR_FREQ_SCALE(0, "1");
261
262static IIO_DEV_ATTR_PHASE(0, 0, S_IWUSR, NULL, ad9834_write, AD9834_REG_PHASE0);
263static IIO_DEV_ATTR_PHASE(0, 1, S_IWUSR, NULL, ad9834_write, AD9834_REG_PHASE1);
264static IIO_DEV_ATTR_PHASESYMBOL(0, S_IWUSR, NULL, ad9834_write, AD9834_PSEL);
265static IIO_CONST_ATTR_PHASE_SCALE(0, "0.0015339808");
266
267static IIO_DEV_ATTR_PINCONTROL_EN(0, S_IWUSR, NULL,
268 ad9834_write, AD9834_PIN_SW);
269static IIO_DEV_ATTR_OUT_ENABLE(0, S_IWUSR, NULL, ad9834_write, AD9834_RESET);
270static IIO_DEV_ATTR_OUTY_ENABLE(0, 1, S_IWUSR, NULL,
271 ad9834_write, AD9834_OPBITEN);
272static IIO_DEV_ATTR_OUT_WAVETYPE(0, 0, ad9834_store_wavetype, 0);
273static IIO_DEV_ATTR_OUT_WAVETYPE(0, 1, ad9834_store_wavetype, 1);
274
275static struct attribute *ad9834_attributes[] = {
276 &iio_dev_attr_dds0_freq0.dev_attr.attr,
277 &iio_dev_attr_dds0_freq1.dev_attr.attr,
278 &iio_const_attr_dds0_freq_scale.dev_attr.attr,
279 &iio_dev_attr_dds0_phase0.dev_attr.attr,
280 &iio_dev_attr_dds0_phase1.dev_attr.attr,
281 &iio_const_attr_dds0_phase_scale.dev_attr.attr,
282 &iio_dev_attr_dds0_pincontrol_en.dev_attr.attr,
283 &iio_dev_attr_dds0_freqsymbol.dev_attr.attr,
284 &iio_dev_attr_dds0_phasesymbol.dev_attr.attr,
285 &iio_dev_attr_dds0_out_enable.dev_attr.attr,
286 &iio_dev_attr_dds0_out1_enable.dev_attr.attr,
287 &iio_dev_attr_dds0_out0_wavetype.dev_attr.attr,
288 &iio_dev_attr_dds0_out1_wavetype.dev_attr.attr,
289 &iio_dev_attr_dds0_out0_wavetype_available.dev_attr.attr,
290 &iio_dev_attr_dds0_out1_wavetype_available.dev_attr.attr,
291 &iio_dev_attr_name.dev_attr.attr,
292 NULL,
293};
294
295static mode_t ad9834_attr_is_visible(struct kobject *kobj,
296 struct attribute *attr, int n)
297{
298 struct device *dev = container_of(kobj, struct device, kobj);
299 struct iio_dev *dev_info = dev_get_drvdata(dev);
300 struct ad9834_state *st = iio_dev_get_devdata(dev_info);
301
302 mode_t mode = attr->mode;
303
304 if (st->devid == ID_AD9834)
305 return mode;
306
307 if ((attr == &iio_dev_attr_dds0_out1_enable.dev_attr.attr) ||
308 (attr == &iio_dev_attr_dds0_out1_wavetype.dev_attr.attr) ||
309 (attr ==
310 &iio_dev_attr_dds0_out1_wavetype_available.dev_attr.attr))
311 mode = 0;
312
313 return mode;
314}
315
316static const struct attribute_group ad9834_attribute_group = {
317 .attrs = ad9834_attributes,
318 .is_visible = ad9834_attr_is_visible,
319};
320
321static int __devinit ad9834_probe(struct spi_device *spi)
322{
323 struct ad9834_platform_data *pdata = spi->dev.platform_data;
324 struct ad9834_state *st;
325 int ret;
326
327 if (!pdata) {
328 dev_dbg(&spi->dev, "no platform data?\n");
329 return -ENODEV;
330 }
331
332 st = kzalloc(sizeof(*st), GFP_KERNEL);
333 if (st == NULL) {
334 ret = -ENOMEM;
335 goto error_ret;
336 }
337
338 st->reg = regulator_get(&spi->dev, "vcc");
339 if (!IS_ERR(st->reg)) {
340 ret = regulator_enable(st->reg);
341 if (ret)
342 goto error_put_reg;
343 }
344
345 st->mclk = pdata->mclk;
346
347 spi_set_drvdata(spi, st);
348
349 st->spi = spi;
350 st->devid = spi_get_device_id(spi)->driver_data;
351
352 st->indio_dev = iio_allocate_device();
353 if (st->indio_dev == NULL) {
354 ret = -ENOMEM;
355 goto error_disable_reg;
356 }
357
358 st->indio_dev->dev.parent = &spi->dev;
359 st->indio_dev->attrs = &ad9834_attribute_group;
360 st->indio_dev->dev_data = (void *) st;
361 st->indio_dev->driver_module = THIS_MODULE;
362 st->indio_dev->modes = INDIO_DIRECT_MODE;
363
364
365
366 st->xfer.tx_buf = &st->data;
367 st->xfer.len = 2;
368
369 spi_message_init(&st->msg);
370 spi_message_add_tail(&st->xfer, &st->msg);
371
372 st->freq_xfer[0].tx_buf = &st->freq_data[0];
373 st->freq_xfer[0].len = 2;
374 st->freq_xfer[0].cs_change = 1;
375 st->freq_xfer[1].tx_buf = &st->freq_data[1];
376 st->freq_xfer[1].len = 2;
377
378 spi_message_init(&st->freq_msg);
379 spi_message_add_tail(&st->freq_xfer[0], &st->freq_msg);
380 spi_message_add_tail(&st->freq_xfer[1], &st->freq_msg);
381
382 st->control = AD9834_B28 | AD9834_RESET;
383
384 if (!pdata->en_div2)
385 st->control |= AD9834_DIV2;
386
387 if (!pdata->en_signbit_msb_out && (st->devid == ID_AD9834))
388 st->control |= AD9834_SIGN_PIB;
389
390 st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
391 ret = spi_sync(st->spi, &st->msg);
392 if (ret) {
393 dev_err(&spi->dev, "device init failed\n");
394 goto error_free_device;
395 }
396
397 ret = ad9834_write_frequency(st, AD9834_REG_FREQ0, pdata->freq0);
398 if (ret)
399 goto error_free_device;
400
401 ret = ad9834_write_frequency(st, AD9834_REG_FREQ1, pdata->freq1);
402 if (ret)
403 goto error_free_device;
404
405 ret = ad9834_write_phase(st, AD9834_REG_PHASE0, pdata->phase0);
406 if (ret)
407 goto error_free_device;
408
409 ret = ad9834_write_phase(st, AD9834_REG_PHASE1, pdata->phase1);
410 if (ret)
411 goto error_free_device;
412
413 ret = iio_device_register(st->indio_dev);
414 if (ret)
415 goto error_free_device;
416
417 return 0;
418
419error_free_device:
420 iio_free_device(st->indio_dev);
421error_disable_reg:
422 if (!IS_ERR(st->reg))
423 regulator_disable(st->reg);
424error_put_reg:
425 if (!IS_ERR(st->reg))
426 regulator_put(st->reg);
427 kfree(st);
428error_ret:
429 return ret;
430}
431
432static int __devexit ad9834_remove(struct spi_device *spi)
433{
434 struct ad9834_state *st = spi_get_drvdata(spi);
435
436 iio_device_unregister(st->indio_dev);
437 if (!IS_ERR(st->reg)) {
438 regulator_disable(st->reg);
439 regulator_put(st->reg);
440 }
441 kfree(st);
442 return 0;
443}
444
445static const struct spi_device_id ad9834_id[] = {
446 {"ad9833", ID_AD9833},
447 {"ad9834", ID_AD9834},
448 {}
449};
450
451static struct spi_driver ad9834_driver = {
452 .driver = {
453 .name = "ad9834",
454 .bus = &spi_bus_type,
455 .owner = THIS_MODULE,
456 },
457 .probe = ad9834_probe,
458 .remove = __devexit_p(ad9834_remove),
459 .id_table = ad9834_id,
460};
461
462static int __init ad9834_init(void)
463{
464 return spi_register_driver(&ad9834_driver);
465}
466module_init(ad9834_init);
467
468static void __exit ad9834_exit(void)
469{
470 spi_unregister_driver(&ad9834_driver);
471}
472module_exit(ad9834_exit);
473
474MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
475MODULE_DESCRIPTION("Analog Devices AD9833/AD9834 DDS");
476MODULE_LICENSE("GPL v2");
477MODULE_ALIAS("spi:ad9834");
478
