drivers/staging/iio/frequency/ad9834.c

   1 /*
   2  * AD9833/AD9834/AD9837/AD9838 SPI DDS driver
   3  *
   4  * Copyright 2010-2011 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2.
   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 <linux/module.h>
  20 #include <asm/div64.h>
  21
  22 #include <linux/iio/iio.h>
  23 #include <linux/iio/sysfs.h>
  24 #include "dds.h"
  25
  26 #include "ad9834.h"
  27
  28 static unsigned int ad9834_calc_freqreg(unsigned long mclk, unsigned long fout)
  29 {
  30         unsigned long long freqreg = (u64)fout * (u64)BIT(AD9834_FREQ_BITS);
  31
  32         do_div(freqreg, mclk);
  33         return freqreg;
  34 }
  35
  36 static int ad9834_write_frequency(struct ad9834_state *st,
  37                                   unsigned long addr, unsigned long fout)
  38 {
  39         unsigned long regval;
  40
  41         if (fout > (st->mclk / 2))
  42                 return -EINVAL;
  43
  44         regval = ad9834_calc_freqreg(st->mclk, fout);
  45
  46         st->freq_data[0] = cpu_to_be16(addr | (regval &
  47                                        RES_MASK(AD9834_FREQ_BITS / 2)));
  48         st->freq_data[1] = cpu_to_be16(addr | ((regval >>
  49                                        (AD9834_FREQ_BITS / 2)) &
  50                                        RES_MASK(AD9834_FREQ_BITS / 2)));
  51
  52         return spi_sync(st->spi, &st->freq_msg);
  53 }
  54
  55 static int ad9834_write_phase(struct ad9834_state *st,
  56                               unsigned long addr, unsigned long phase)
  57 {
  58         if (phase > BIT(AD9834_PHASE_BITS))
  59                 return -EINVAL;
  60         st->data = cpu_to_be16(addr | phase);
  61
  62         return spi_sync(st->spi, &st->msg);
  63 }
  64
  65 static ssize_t ad9834_write(struct device *dev,
  66                             struct device_attribute *attr,
  67                             const char *buf,
  68                             size_t len)
  69 {
  70         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
  71         struct ad9834_state *st = iio_priv(indio_dev);
  72         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
  73         int ret;
  74         unsigned long val;
  75
  76         ret = kstrtoul(buf, 10, &val);
  77         if (ret)
  78                 goto error_ret;
  79
  80         mutex_lock(&indio_dev->mlock);
  81         switch ((u32)this_attr->address) {
  82         case AD9834_REG_FREQ0:
  83         case AD9834_REG_FREQ1:
  84                 ret = ad9834_write_frequency(st, this_attr->address, val);
  85                 break;
  86         case AD9834_REG_PHASE0:
  87         case AD9834_REG_PHASE1:
  88                 ret = ad9834_write_phase(st, this_attr->address, val);
  89                 break;
  90         case AD9834_OPBITEN:
  91                 if (st->control & AD9834_MODE) {
  92                         ret = -EINVAL;  /* AD9843 reserved mode */
  93                         break;
  94                 }
  95
  96                 if (val)
  97                         st->control |= AD9834_OPBITEN;
  98                 else
  99                         st->control &= ~AD9834_OPBITEN;
 100
 101                 st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
 102                 ret = spi_sync(st->spi, &st->msg);
 103                 break;
 104         case AD9834_PIN_SW:
 105                 if (val)
 106                         st->control |= AD9834_PIN_SW;
 107                 else
 108                         st->control &= ~AD9834_PIN_SW;
 109                 st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
 110                 ret = spi_sync(st->spi, &st->msg);
 111                 break;
 112         case AD9834_FSEL:
 113         case AD9834_PSEL:
 114                 if (val == 0) {
 115                         st->control &= ~(this_attr->address | AD9834_PIN_SW);
 116                 } else if (val == 1) {
 117                         st->control |= this_attr->address;
 118                         st->control &= ~AD9834_PIN_SW;
 119                 } else {
 120                         ret = -EINVAL;
 121                         break;
 122                 }
 123                 st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
 124                 ret = spi_sync(st->spi, &st->msg);
 125                 break;
 126         case AD9834_RESET:
 127                 if (val)
 128                         st->control &= ~AD9834_RESET;
 129                 else
 130                         st->control |= AD9834_RESET;
 131
 132                 st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
 133                 ret = spi_sync(st->spi, &st->msg);
 134                 break;
 135         default:
 136                 ret = -ENODEV;
 137         }
 138         mutex_unlock(&indio_dev->mlock);
 139
 140 error_ret:
 141         return ret ? ret : len;
 142 }
 143
 144 static ssize_t ad9834_store_wavetype(struct device *dev,
 145                                      struct device_attribute *attr,
 146                                      const char *buf,
 147                                      size_t len)
 148 {
 149         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 150         struct ad9834_state *st = iio_priv(indio_dev);
 151         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 152         int ret = 0;
 153         bool is_ad9833_7 = (st->devid == ID_AD9833) || (st->devid == ID_AD9837);
 154
 155         mutex_lock(&indio_dev->mlock);
 156
 157         switch ((u32)this_attr->address) {
 158         case 0:
 159                 if (sysfs_streq(buf, "sine")) {
 160                         st->control &= ~AD9834_MODE;
 161                         if (is_ad9833_7)
 162                                 st->control &= ~AD9834_OPBITEN;
 163                 } else if (sysfs_streq(buf, "triangle")) {
 164                         if (is_ad9833_7) {
 165                                 st->control &= ~AD9834_OPBITEN;
 166                                 st->control |= AD9834_MODE;
 167                         } else if (st->control & AD9834_OPBITEN) {
 168                                 ret = -EINVAL;  /* AD9843 reserved mode */
 169                         } else {
 170                                 st->control |= AD9834_MODE;
 171                         }
 172                 } else if (is_ad9833_7 && sysfs_streq(buf, "square")) {
 173                         st->control &= ~AD9834_MODE;
 174                         st->control |= AD9834_OPBITEN;
 175                 } else {
 176                         ret = -EINVAL;
 177                 }
 178
 179                 break;
 180         case 1:
 181                 if (sysfs_streq(buf, "square") &&
 182                     !(st->control & AD9834_MODE)) {
 183                         st->control &= ~AD9834_MODE;
 184                         st->control |= AD9834_OPBITEN;
 185                 } else {
 186                         ret = -EINVAL;
 187                 }
 188                 break;
 189         default:
 190                 ret = -EINVAL;
 191                 break;
 192         }
 193
 194         if (!ret) {
 195                 st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
 196                 ret = spi_sync(st->spi, &st->msg);
 197         }
 198         mutex_unlock(&indio_dev->mlock);
 199
 200         return ret ? ret : len;
 201 }
 202
 203 static
 204 ssize_t ad9834_show_out0_wavetype_available(struct device *dev,
 205                                             struct device_attribute *attr,
 206                                             char *buf)
 207 {
 208         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 209         struct ad9834_state *st = iio_priv(indio_dev);
 210         char *str;
 211
 212         if ((st->devid == ID_AD9833) || (st->devid == ID_AD9837))
 213                 str = "sine triangle square";
 214         else if (st->control & AD9834_OPBITEN)
 215                 str = "sine";
 216         else
 217                 str = "sine triangle";
 218
 219         return sprintf(buf, "%s\n", str);
 220 }
 221
 222 static IIO_DEVICE_ATTR(out_altvoltage0_out0_wavetype_available, S_IRUGO,
 223                        ad9834_show_out0_wavetype_available, NULL, 0);
 224
 225 static
 226 ssize_t ad9834_show_out1_wavetype_available(struct device *dev,
 227                                             struct device_attribute *attr,
 228                                             char *buf)
 229 {
 230         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 231         struct ad9834_state *st = iio_priv(indio_dev);
 232         char *str;
 233
 234         if (st->control & AD9834_MODE)
 235                 str = "";
 236         else
 237                 str = "square";
 238
 239         return sprintf(buf, "%s\n", str);
 240 }
 241
 242 static IIO_DEVICE_ATTR(out_altvoltage0_out1_wavetype_available, S_IRUGO,
 243                        ad9834_show_out1_wavetype_available, NULL, 0);
 244
 245 /**
 246  * see dds.h for further information
 247  */
 248
 249 static IIO_DEV_ATTR_FREQ(0, 0, S_IWUSR, NULL, ad9834_write, AD9834_REG_FREQ0);
 250 static IIO_DEV_ATTR_FREQ(0, 1, S_IWUSR, NULL, ad9834_write, AD9834_REG_FREQ1);
 251 static IIO_DEV_ATTR_FREQSYMBOL(0, S_IWUSR, NULL, ad9834_write, AD9834_FSEL);
 252 static IIO_CONST_ATTR_FREQ_SCALE(0, "1"); /* 1Hz */
 253
 254 static IIO_DEV_ATTR_PHASE(0, 0, S_IWUSR, NULL, ad9834_write, AD9834_REG_PHASE0);
 255 static IIO_DEV_ATTR_PHASE(0, 1, S_IWUSR, NULL, ad9834_write, AD9834_REG_PHASE1);
 256 static IIO_DEV_ATTR_PHASESYMBOL(0, S_IWUSR, NULL, ad9834_write, AD9834_PSEL);
 257 static IIO_CONST_ATTR_PHASE_SCALE(0, "0.0015339808"); /* 2PI/2^12 rad*/
 258
 259 static IIO_DEV_ATTR_PINCONTROL_EN(0, S_IWUSR, NULL,
 260         ad9834_write, AD9834_PIN_SW);
 261 static IIO_DEV_ATTR_OUT_ENABLE(0, S_IWUSR, NULL, ad9834_write, AD9834_RESET);
 262 static IIO_DEV_ATTR_OUTY_ENABLE(0, 1, S_IWUSR, NULL,
 263         ad9834_write, AD9834_OPBITEN);
 264 static IIO_DEV_ATTR_OUT_WAVETYPE(0, 0, ad9834_store_wavetype, 0);
 265 static IIO_DEV_ATTR_OUT_WAVETYPE(0, 1, ad9834_store_wavetype, 1);
 266
 267 static struct attribute *ad9834_attributes[] = {
 268         &iio_dev_attr_out_altvoltage0_frequency0.dev_attr.attr,
 269         &iio_dev_attr_out_altvoltage0_frequency1.dev_attr.attr,
 270         &iio_const_attr_out_altvoltage0_frequency_scale.dev_attr.attr,
 271         &iio_dev_attr_out_altvoltage0_phase0.dev_attr.attr,
 272         &iio_dev_attr_out_altvoltage0_phase1.dev_attr.attr,
 273         &iio_const_attr_out_altvoltage0_phase_scale.dev_attr.attr,
 274         &iio_dev_attr_out_altvoltage0_pincontrol_en.dev_attr.attr,
 275         &iio_dev_attr_out_altvoltage0_frequencysymbol.dev_attr.attr,
 276         &iio_dev_attr_out_altvoltage0_phasesymbol.dev_attr.attr,
 277         &iio_dev_attr_out_altvoltage0_out_enable.dev_attr.attr,
 278         &iio_dev_attr_out_altvoltage0_out1_enable.dev_attr.attr,
 279         &iio_dev_attr_out_altvoltage0_out0_wavetype.dev_attr.attr,
 280         &iio_dev_attr_out_altvoltage0_out1_wavetype.dev_attr.attr,
 281         &iio_dev_attr_out_altvoltage0_out0_wavetype_available.dev_attr.attr,
 282         &iio_dev_attr_out_altvoltage0_out1_wavetype_available.dev_attr.attr,
 283         NULL,
 284 };
 285
 286 static struct attribute *ad9833_attributes[] = {
 287         &iio_dev_attr_out_altvoltage0_frequency0.dev_attr.attr,
 288         &iio_dev_attr_out_altvoltage0_frequency1.dev_attr.attr,
 289         &iio_const_attr_out_altvoltage0_frequency_scale.dev_attr.attr,
 290         &iio_dev_attr_out_altvoltage0_phase0.dev_attr.attr,
 291         &iio_dev_attr_out_altvoltage0_phase1.dev_attr.attr,
 292         &iio_const_attr_out_altvoltage0_phase_scale.dev_attr.attr,
 293         &iio_dev_attr_out_altvoltage0_frequencysymbol.dev_attr.attr,
 294         &iio_dev_attr_out_altvoltage0_phasesymbol.dev_attr.attr,
 295         &iio_dev_attr_out_altvoltage0_out_enable.dev_attr.attr,
 296         &iio_dev_attr_out_altvoltage0_out0_wavetype.dev_attr.attr,
 297         &iio_dev_attr_out_altvoltage0_out0_wavetype_available.dev_attr.attr,
 298         NULL,
 299 };
 300
 301 static const struct attribute_group ad9834_attribute_group = {
 302         .attrs = ad9834_attributes,
 303 };
 304
 305 static const struct attribute_group ad9833_attribute_group = {
 306         .attrs = ad9833_attributes,
 307 };
 308
 309 static const struct iio_info ad9834_info = {
 310         .attrs = &ad9834_attribute_group,
 311         .driver_module = THIS_MODULE,
 312 };
 313
 314 static const struct iio_info ad9833_info = {
 315         .attrs = &ad9833_attribute_group,
 316         .driver_module = THIS_MODULE,
 317 };
 318
 319 static int ad9834_probe(struct spi_device *spi)
 320 {
 321         struct ad9834_platform_data *pdata = spi->dev.platform_data;
 322         struct ad9834_state *st;
 323         struct iio_dev *indio_dev;
 324         struct regulator *reg;
 325         int ret;
 326
 327         if (!pdata) {
 328                 dev_dbg(&spi->dev, "no platform data?\n");
 329                 return -ENODEV;
 330         }
 331
 332         reg = devm_regulator_get(&spi->dev, "vcc");
 333         if (!IS_ERR(reg)) {
 334                 ret = regulator_enable(reg);
 335                 if (ret)
 336                         return ret;
 337         }
 338
 339         indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
 340         if (!indio_dev) {
 341                 ret = -ENOMEM;
 342                 goto error_disable_reg;
 343         }
 344         spi_set_drvdata(spi, indio_dev);
 345         st = iio_priv(indio_dev);
 346         st->mclk = pdata->mclk;
 347         st->spi = spi;
 348         st->devid = spi_get_device_id(spi)->driver_data;
 349         st->reg = reg;
 350         indio_dev->dev.parent = &spi->dev;
 351         indio_dev->name = spi_get_device_id(spi)->name;
 352         switch (st->devid) {
 353         case ID_AD9833:
 354         case ID_AD9837:
 355                 indio_dev->info = &ad9833_info;
 356                 break;
 357         default:
 358                 indio_dev->info = &ad9834_info;
 359                 break;
 360         }
 361         indio_dev->modes = INDIO_DIRECT_MODE;
 362
 363         /* Setup default messages */
 364
 365         st->xfer.tx_buf = &st->data;
 366         st->xfer.len = 2;
 367
 368         spi_message_init(&st->msg);
 369         spi_message_add_tail(&st->xfer, &st->msg);
 370
 371         st->freq_xfer[0].tx_buf = &st->freq_data[0];
 372         st->freq_xfer[0].len = 2;
 373         st->freq_xfer[0].cs_change = 1;
 374         st->freq_xfer[1].tx_buf = &st->freq_data[1];
 375         st->freq_xfer[1].len = 2;
 376
 377         spi_message_init(&st->freq_msg);
 378         spi_message_add_tail(&st->freq_xfer[0], &st->freq_msg);
 379         spi_message_add_tail(&st->freq_xfer[1], &st->freq_msg);
 380
 381         st->control = AD9834_B28 | AD9834_RESET;
 382
 383         if (!pdata->en_div2)
 384                 st->control |= AD9834_DIV2;
 385
 386         if (!pdata->en_signbit_msb_out && (st->devid == ID_AD9834))
 387                 st->control |= AD9834_SIGN_PIB;
 388
 389         st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
 390         ret = spi_sync(st->spi, &st->msg);
 391         if (ret) {
 392                 dev_err(&spi->dev, "device init failed\n");
 393                 goto error_disable_reg;
 394         }
 395
 396         ret = ad9834_write_frequency(st, AD9834_REG_FREQ0, pdata->freq0);
 397         if (ret)
 398                 goto error_disable_reg;
 399
 400         ret = ad9834_write_frequency(st, AD9834_REG_FREQ1, pdata->freq1);
 401         if (ret)
 402                 goto error_disable_reg;
 403
 404         ret = ad9834_write_phase(st, AD9834_REG_PHASE0, pdata->phase0);
 405         if (ret)
 406                 goto error_disable_reg;
 407
 408         ret = ad9834_write_phase(st, AD9834_REG_PHASE1, pdata->phase1);
 409         if (ret)
 410                 goto error_disable_reg;
 411
 412         ret = iio_device_register(indio_dev);
 413         if (ret)
 414                 goto error_disable_reg;
 415
 416         return 0;
 417
 418 error_disable_reg:
 419         if (!IS_ERR(reg))
 420                 regulator_disable(reg);
 421
 422         return ret;
 423 }
 424
 425 static int ad9834_remove(struct spi_device *spi)
 426 {
 427         struct iio_dev *indio_dev = spi_get_drvdata(spi);
 428         struct ad9834_state *st = iio_priv(indio_dev);
 429
 430         iio_device_unregister(indio_dev);
 431         if (!IS_ERR(st->reg))
 432                 regulator_disable(st->reg);
 433
 434         return 0;
 435 }
 436
 437 static const struct spi_device_id ad9834_id[] = {
 438         {"ad9833", ID_AD9833},
 439         {"ad9834", ID_AD9834},
 440         {"ad9837", ID_AD9837},
 441         {"ad9838", ID_AD9838},
 442         {}
 443 };
 444 MODULE_DEVICE_TABLE(spi, ad9834_id);
 445
 446 static struct spi_driver ad9834_driver = {
 447         .driver = {
 448                 .name   = "ad9834",
 449                 .owner  = THIS_MODULE,
 450         },
 451         .probe          = ad9834_probe,
 452         .remove         = ad9834_remove,
 453         .id_table       = ad9834_id,
 454 };
 455 module_spi_driver(ad9834_driver);
 456
 457 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 458 MODULE_DESCRIPTION("Analog Devices AD9833/AD9834/AD9837/AD9838 DDS");
 459 MODULE_LICENSE("GPL v2");