drivers/staging/iio/meter/ade7754.c

   1 /*
   2  * ADE7754 Polyphase Multifunction Energy Metering IC Driver
   3  *
   4  * Copyright 2010 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #include <linux/interrupt.h>
  10 #include <linux/irq.h>
  11 #include <linux/gpio.h>
  12 #include <linux/delay.h>
  13 #include <linux/mutex.h>
  14 #include <linux/device.h>
  15 #include <linux/kernel.h>
  16 #include <linux/spi/spi.h>
  17 #include <linux/slab.h>
  18 #include <linux/sysfs.h>
  19 #include <linux/list.h>
  20
  21 #include "../iio.h"
  22 #include "../sysfs.h"
  23 #include "meter.h"
  24 #include "ade7754.h"
  25
  26 static int ade7754_spi_write_reg_8(struct device *dev,
  27                 u8 reg_address,
  28                 u8 val)
  29 {
  30         int ret;
  31         struct iio_dev *indio_dev = dev_get_drvdata(dev);
  32         struct ade7754_state *st = iio_dev_get_devdata(indio_dev);
  33
  34         mutex_lock(&st->buf_lock);
  35         st->tx[0] = ADE7754_WRITE_REG(reg_address);
  36         st->tx[1] = val;
  37
  38         ret = spi_write(st->us, st->tx, 2);
  39         mutex_unlock(&st->buf_lock);
  40
  41         return ret;
  42 }
  43
  44 static int ade7754_spi_write_reg_16(struct device *dev,
  45                 u8 reg_address,
  46                 u16 value)
  47 {
  48         int ret;
  49         struct iio_dev *indio_dev = dev_get_drvdata(dev);
  50         struct ade7754_state *st = iio_dev_get_devdata(indio_dev);
  51
  52         mutex_lock(&st->buf_lock);
  53         st->tx[0] = ADE7754_WRITE_REG(reg_address);
  54         st->tx[1] = (value >> 8) & 0xFF;
  55         st->tx[2] = value & 0xFF;
  56         ret = spi_write(st->us, st->tx, 3);
  57         mutex_unlock(&st->buf_lock);
  58
  59         return ret;
  60 }
  61
  62 static int ade7754_spi_read_reg_8(struct device *dev,
  63                 u8 reg_address,
  64                 u8 *val)
  65 {
  66         struct iio_dev *indio_dev = dev_get_drvdata(dev);
  67         struct ade7754_state *st = iio_dev_get_devdata(indio_dev);
  68         int ret;
  69
  70         ret = spi_w8r8(st->us, ADE7754_READ_REG(reg_address));
  71         if (ret < 0) {
  72                 dev_err(&st->us->dev, "problem when reading 8 bit register 0x%02X",
  73                                 reg_address);
  74                 return ret;
  75         }
  76         *val = ret;
  77
  78         return 0;
  79 }
  80
  81 static int ade7754_spi_read_reg_16(struct device *dev,
  82                 u8 reg_address,
  83                 u16 *val)
  84 {
  85         struct iio_dev *indio_dev = dev_get_drvdata(dev);
  86         struct ade7754_state *st = iio_dev_get_devdata(indio_dev);
  87         int ret;
  88
  89         ret = spi_w8r16(st->us, ADE7754_READ_REG(reg_address));
  90         if (ret < 0) {
  91                 dev_err(&st->us->dev, "problem when reading 16 bit register 0x%02X",
  92                         reg_address);
  93                 return ret;
  94         }
  95
  96         *val = ret;
  97         *val = be16_to_cpup(val);
  98
  99         return 0;
 100 }
 101
 102 static int ade7754_spi_read_reg_24(struct device *dev,
 103                 u8 reg_address,
 104                 u32 *val)
 105 {
 106         struct spi_message msg;
 107         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 108         struct ade7754_state *st = iio_dev_get_devdata(indio_dev);
 109         int ret;
 110         struct spi_transfer xfers[] = {
 111                 {
 112                         .tx_buf = st->tx,
 113                         .rx_buf = st->rx,
 114                         .bits_per_word = 8,
 115                         .len = 4,
 116                 },
 117         };
 118
 119         mutex_lock(&st->buf_lock);
 120         st->tx[0] = ADE7754_READ_REG(reg_address);
 121         st->tx[1] = 0;
 122         st->tx[2] = 0;
 123         st->tx[3] = 0;
 124
 125         spi_message_init(&msg);
 126         spi_message_add_tail(xfers, &msg);
 127         ret = spi_sync(st->us, &msg);
 128         if (ret) {
 129                 dev_err(&st->us->dev, "problem when reading 24 bit register 0x%02X",
 130                                 reg_address);
 131                 goto error_ret;
 132         }
 133         *val = (st->rx[1] << 16) | (st->rx[2] << 8) | st->rx[3];
 134
 135 error_ret:
 136         mutex_unlock(&st->buf_lock);
 137         return ret;
 138 }
 139
 140 static ssize_t ade7754_read_8bit(struct device *dev,
 141                 struct device_attribute *attr,
 142                 char *buf)
 143 {
 144         int ret;
 145         u8 val = 0;
 146         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 147
 148         ret = ade7754_spi_read_reg_8(dev, this_attr->address, &val);
 149         if (ret)
 150                 return ret;
 151
 152         return sprintf(buf, "%u\n", val);
 153 }
 154
 155 static ssize_t ade7754_read_16bit(struct device *dev,
 156                 struct device_attribute *attr,
 157                 char *buf)
 158 {
 159         int ret;
 160         u16 val = 0;
 161         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 162
 163         ret = ade7754_spi_read_reg_16(dev, this_attr->address, &val);
 164         if (ret)
 165                 return ret;
 166
 167         return sprintf(buf, "%u\n", val);
 168 }
 169
 170 static ssize_t ade7754_read_24bit(struct device *dev,
 171                 struct device_attribute *attr,
 172                 char *buf)
 173 {
 174         int ret;
 175         u32 val = 0;
 176         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 177
 178         ret = ade7754_spi_read_reg_24(dev, this_attr->address, &val);
 179         if (ret)
 180                 return ret;
 181
 182         return sprintf(buf, "%u\n", val & 0xFFFFFF);
 183 }
 184
 185 static ssize_t ade7754_write_8bit(struct device *dev,
 186                 struct device_attribute *attr,
 187                 const char *buf,
 188                 size_t len)
 189 {
 190         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 191         int ret;
 192         long val;
 193
 194         ret = strict_strtol(buf, 10, &val);
 195         if (ret)
 196                 goto error_ret;
 197         ret = ade7754_spi_write_reg_8(dev, this_attr->address, val);
 198
 199 error_ret:
 200         return ret ? ret : len;
 201 }
 202
 203 static ssize_t ade7754_write_16bit(struct device *dev,
 204                 struct device_attribute *attr,
 205                 const char *buf,
 206                 size_t len)
 207 {
 208         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 209         int ret;
 210         long val;
 211
 212         ret = strict_strtol(buf, 10, &val);
 213         if (ret)
 214                 goto error_ret;
 215         ret = ade7754_spi_write_reg_16(dev, this_attr->address, val);
 216
 217 error_ret:
 218         return ret ? ret : len;
 219 }
 220
 221 static int ade7754_reset(struct device *dev)
 222 {
 223         u8 val;
 224
 225         ade7754_spi_read_reg_8(dev, ADE7754_OPMODE, &val);
 226         val |= 1 << 6; /* Software Chip Reset */
 227         return ade7754_spi_write_reg_8(dev, ADE7754_OPMODE, val);
 228 }
 229
 230
 231 static ssize_t ade7754_write_reset(struct device *dev,
 232                 struct device_attribute *attr,
 233                 const char *buf, size_t len)
 234 {
 235         if (len < 1)
 236                 return -1;
 237         switch (buf[0]) {
 238         case '1':
 239         case 'y':
 240         case 'Y':
 241                 return ade7754_reset(dev);
 242         }
 243         return -1;
 244 }
 245
 246 static IIO_DEV_ATTR_AENERGY(ade7754_read_24bit, ADE7754_AENERGY);
 247 static IIO_DEV_ATTR_LAENERGY(ade7754_read_24bit, ADE7754_LAENERGY);
 248 static IIO_DEV_ATTR_VAENERGY(ade7754_read_24bit, ADE7754_VAENERGY);
 249 static IIO_DEV_ATTR_LVAENERGY(ade7754_read_24bit, ADE7754_LVAENERGY);
 250 static IIO_DEV_ATTR_VPEAK(S_IWUSR | S_IRUGO,
 251                 ade7754_read_8bit,
 252                 ade7754_write_8bit,
 253                 ADE7754_VPEAK);
 254 static IIO_DEV_ATTR_IPEAK(S_IWUSR | S_IRUGO,
 255                 ade7754_read_8bit,
 256                 ade7754_write_8bit,
 257                 ADE7754_VPEAK);
 258 static IIO_DEV_ATTR_APHCAL(S_IWUSR | S_IRUGO,
 259                 ade7754_read_8bit,
 260                 ade7754_write_8bit,
 261                 ADE7754_APHCAL);
 262 static IIO_DEV_ATTR_BPHCAL(S_IWUSR | S_IRUGO,
 263                 ade7754_read_8bit,
 264                 ade7754_write_8bit,
 265                 ADE7754_BPHCAL);
 266 static IIO_DEV_ATTR_CPHCAL(S_IWUSR | S_IRUGO,
 267                 ade7754_read_8bit,
 268                 ade7754_write_8bit,
 269                 ADE7754_CPHCAL);
 270 static IIO_DEV_ATTR_AAPOS(S_IWUSR | S_IRUGO,
 271                 ade7754_read_16bit,
 272                 ade7754_write_16bit,
 273                 ADE7754_AAPOS);
 274 static IIO_DEV_ATTR_BAPOS(S_IWUSR | S_IRUGO,
 275                 ade7754_read_16bit,
 276                 ade7754_write_16bit,
 277                 ADE7754_BAPOS);
 278 static IIO_DEV_ATTR_CAPOS(S_IWUSR | S_IRUGO,
 279                 ade7754_read_16bit,
 280                 ade7754_write_16bit,
 281                 ADE7754_CAPOS);
 282 static IIO_DEV_ATTR_WDIV(S_IWUSR | S_IRUGO,
 283                 ade7754_read_8bit,
 284                 ade7754_write_8bit,
 285                 ADE7754_WDIV);
 286 static IIO_DEV_ATTR_VADIV(S_IWUSR | S_IRUGO,
 287                 ade7754_read_8bit,
 288                 ade7754_write_8bit,
 289                 ADE7754_VADIV);
 290 static IIO_DEV_ATTR_CFNUM(S_IWUSR | S_IRUGO,
 291                 ade7754_read_16bit,
 292                 ade7754_write_16bit,
 293                 ADE7754_CFNUM);
 294 static IIO_DEV_ATTR_CFDEN(S_IWUSR | S_IRUGO,
 295                 ade7754_read_16bit,
 296                 ade7754_write_16bit,
 297                 ADE7754_CFDEN);
 298 static IIO_DEV_ATTR_ACTIVE_POWER_A_GAIN(S_IWUSR | S_IRUGO,
 299                 ade7754_read_16bit,
 300                 ade7754_write_16bit,
 301                 ADE7754_AAPGAIN);
 302 static IIO_DEV_ATTR_ACTIVE_POWER_B_GAIN(S_IWUSR | S_IRUGO,
 303                 ade7754_read_16bit,
 304                 ade7754_write_16bit,
 305                 ADE7754_BAPGAIN);
 306 static IIO_DEV_ATTR_ACTIVE_POWER_C_GAIN(S_IWUSR | S_IRUGO,
 307                 ade7754_read_16bit,
 308                 ade7754_write_16bit,
 309                 ADE7754_CAPGAIN);
 310 static IIO_DEV_ATTR_AIRMS(S_IRUGO,
 311                 ade7754_read_24bit,
 312                 NULL,
 313                 ADE7754_AIRMS);
 314 static IIO_DEV_ATTR_BIRMS(S_IRUGO,
 315                 ade7754_read_24bit,
 316                 NULL,
 317                 ADE7754_BIRMS);
 318 static IIO_DEV_ATTR_CIRMS(S_IRUGO,
 319                 ade7754_read_24bit,
 320                 NULL,
 321                 ADE7754_CIRMS);
 322 static IIO_DEV_ATTR_AVRMS(S_IRUGO,
 323                 ade7754_read_24bit,
 324                 NULL,
 325                 ADE7754_AVRMS);
 326 static IIO_DEV_ATTR_BVRMS(S_IRUGO,
 327                 ade7754_read_24bit,
 328                 NULL,
 329                 ADE7754_BVRMS);
 330 static IIO_DEV_ATTR_CVRMS(S_IRUGO,
 331                 ade7754_read_24bit,
 332                 NULL,
 333                 ADE7754_CVRMS);
 334 static IIO_DEV_ATTR_AIRMSOS(S_IRUGO,
 335                 ade7754_read_16bit,
 336                 ade7754_write_16bit,
 337                 ADE7754_AIRMSOS);
 338 static IIO_DEV_ATTR_BIRMSOS(S_IRUGO,
 339                 ade7754_read_16bit,
 340                 ade7754_write_16bit,
 341                 ADE7754_BIRMSOS);
 342 static IIO_DEV_ATTR_CIRMSOS(S_IRUGO,
 343                 ade7754_read_16bit,
 344                 ade7754_write_16bit,
 345                 ADE7754_CIRMSOS);
 346 static IIO_DEV_ATTR_AVRMSOS(S_IRUGO,
 347                 ade7754_read_16bit,
 348                 ade7754_write_16bit,
 349                 ADE7754_AVRMSOS);
 350 static IIO_DEV_ATTR_BVRMSOS(S_IRUGO,
 351                 ade7754_read_16bit,
 352                 ade7754_write_16bit,
 353                 ADE7754_BVRMSOS);
 354 static IIO_DEV_ATTR_CVRMSOS(S_IRUGO,
 355                 ade7754_read_16bit,
 356                 ade7754_write_16bit,
 357                 ADE7754_CVRMSOS);
 358
 359 static int ade7754_set_irq(struct device *dev, bool enable)
 360 {
 361         int ret;
 362         u16 irqen;
 363         ret = ade7754_spi_read_reg_16(dev, ADE7754_IRQEN, &irqen);
 364         if (ret)
 365                 goto error_ret;
 366
 367         if (enable)
 368                 irqen |= 1 << 14; /* Enables an interrupt when a data is
 369                                      present in the waveform register */
 370         else
 371                 irqen &= ~(1 << 14);
 372
 373         ret = ade7754_spi_write_reg_16(dev, ADE7754_IRQEN, irqen);
 374         if (ret)
 375                 goto error_ret;
 376
 377 error_ret:
 378         return ret;
 379 }
 380
 381 /* Power down the device */
 382 static int ade7754_stop_device(struct device *dev)
 383 {
 384         u8 val;
 385
 386         ade7754_spi_read_reg_8(dev, ADE7754_OPMODE, &val);
 387         val |= 7 << 3;  /* ADE7754 powered down */
 388         return ade7754_spi_write_reg_8(dev, ADE7754_OPMODE, val);
 389 }
 390
 391 static int ade7754_initial_setup(struct ade7754_state *st)
 392 {
 393         int ret;
 394         struct device *dev = &st->indio_dev->dev;
 395
 396         /* use low spi speed for init */
 397         st->us->mode = SPI_MODE_3;
 398         spi_setup(st->us);
 399
 400         /* Disable IRQ */
 401         ret = ade7754_set_irq(dev, false);
 402         if (ret) {
 403                 dev_err(dev, "disable irq failed");
 404                 goto err_ret;
 405         }
 406
 407         ade7754_reset(dev);
 408         msleep(ADE7754_STARTUP_DELAY);
 409
 410 err_ret:
 411         return ret;
 412 }
 413
 414 static ssize_t ade7754_read_frequency(struct device *dev,
 415                 struct device_attribute *attr,
 416                 char *buf)
 417 {
 418         int ret;
 419         u8 t;
 420         int sps;
 421         ret = ade7754_spi_read_reg_8(dev,
 422                         ADE7754_WAVMODE,
 423                         &t);
 424         if (ret)
 425                 return ret;
 426
 427         t = (t >> 3) & 0x3;
 428         sps = 26000 / (1 + t);
 429
 430         return sprintf(buf, "%d\n", sps);
 431 }
 432
 433 static ssize_t ade7754_write_frequency(struct device *dev,
 434                 struct device_attribute *attr,
 435                 const char *buf,
 436                 size_t len)
 437 {
 438         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 439         struct ade7754_state *st = iio_dev_get_devdata(indio_dev);
 440         unsigned long val;
 441         int ret;
 442         u8 reg, t;
 443
 444         ret = strict_strtol(buf, 10, &val);
 445         if (ret)
 446                 return ret;
 447
 448         mutex_lock(&indio_dev->mlock);
 449
 450         t = (26000 / val);
 451         if (t > 0)
 452                 t--;
 453
 454         if (t > 1)
 455                 st->us->max_speed_hz = ADE7754_SPI_SLOW;
 456         else
 457                 st->us->max_speed_hz = ADE7754_SPI_FAST;
 458
 459         ret = ade7754_spi_read_reg_8(dev, ADE7754_WAVMODE, &reg);
 460         if (ret)
 461                 goto out;
 462
 463         reg &= ~(3 << 3);
 464         reg |= t << 3;
 465
 466         ret = ade7754_spi_write_reg_8(dev, ADE7754_WAVMODE, reg);
 467
 468 out:
 469         mutex_unlock(&indio_dev->mlock);
 470
 471         return ret ? ret : len;
 472 }
 473 static IIO_DEV_ATTR_TEMP_RAW(ade7754_read_8bit);
 474 static IIO_CONST_ATTR(temp_offset, "129 C");
 475 static IIO_CONST_ATTR(temp_scale, "4 C");
 476
 477 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
 478                 ade7754_read_frequency,
 479                 ade7754_write_frequency);
 480
 481 static IIO_DEV_ATTR_RESET(ade7754_write_reset);
 482
 483 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("26000 13000 65000 33000");
 484
 485 static struct attribute *ade7754_attributes[] = {
 486         &iio_dev_attr_temp_raw.dev_attr.attr,
 487         &iio_const_attr_temp_offset.dev_attr.attr,
 488         &iio_const_attr_temp_scale.dev_attr.attr,
 489         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 490         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 491         &iio_dev_attr_reset.dev_attr.attr,
 492         &iio_dev_attr_aenergy.dev_attr.attr,
 493         &iio_dev_attr_laenergy.dev_attr.attr,
 494         &iio_dev_attr_vaenergy.dev_attr.attr,
 495         &iio_dev_attr_lvaenergy.dev_attr.attr,
 496         &iio_dev_attr_vpeak.dev_attr.attr,
 497         &iio_dev_attr_ipeak.dev_attr.attr,
 498         &iio_dev_attr_aphcal.dev_attr.attr,
 499         &iio_dev_attr_bphcal.dev_attr.attr,
 500         &iio_dev_attr_cphcal.dev_attr.attr,
 501         &iio_dev_attr_aapos.dev_attr.attr,
 502         &iio_dev_attr_bapos.dev_attr.attr,
 503         &iio_dev_attr_capos.dev_attr.attr,
 504         &iio_dev_attr_wdiv.dev_attr.attr,
 505         &iio_dev_attr_vadiv.dev_attr.attr,
 506         &iio_dev_attr_cfnum.dev_attr.attr,
 507         &iio_dev_attr_cfden.dev_attr.attr,
 508         &iio_dev_attr_active_power_a_gain.dev_attr.attr,
 509         &iio_dev_attr_active_power_b_gain.dev_attr.attr,
 510         &iio_dev_attr_active_power_c_gain.dev_attr.attr,
 511         &iio_dev_attr_airms.dev_attr.attr,
 512         &iio_dev_attr_birms.dev_attr.attr,
 513         &iio_dev_attr_cirms.dev_attr.attr,
 514         &iio_dev_attr_avrms.dev_attr.attr,
 515         &iio_dev_attr_bvrms.dev_attr.attr,
 516         &iio_dev_attr_cvrms.dev_attr.attr,
 517         &iio_dev_attr_airmsos.dev_attr.attr,
 518         &iio_dev_attr_birmsos.dev_attr.attr,
 519         &iio_dev_attr_cirmsos.dev_attr.attr,
 520         &iio_dev_attr_avrmsos.dev_attr.attr,
 521         &iio_dev_attr_bvrmsos.dev_attr.attr,
 522         &iio_dev_attr_cvrmsos.dev_attr.attr,
 523         NULL,
 524 };
 525
 526 static const struct attribute_group ade7754_attribute_group = {
 527         .attrs = ade7754_attributes,
 528 };
 529
 530
 531
 532 static int __devinit ade7754_probe(struct spi_device *spi)
 533 {
 534         int ret, regdone = 0;
 535         struct ade7754_state *st = kzalloc(sizeof *st, GFP_KERNEL);
 536         if (!st) {
 537                 ret =  -ENOMEM;
 538                 goto error_ret;
 539         }
 540         /* this is only used for removal purposes */
 541         spi_set_drvdata(spi, st);
 542
 543         /* Allocate the comms buffers */
 544         st->rx = kzalloc(sizeof(*st->rx)*ADE7754_MAX_RX, GFP_KERNEL);
 545         if (st->rx == NULL) {
 546                 ret = -ENOMEM;
 547                 goto error_free_st;
 548         }
 549         st->tx = kzalloc(sizeof(*st->tx)*ADE7754_MAX_TX, GFP_KERNEL);
 550         if (st->tx == NULL) {
 551                 ret = -ENOMEM;
 552                 goto error_free_rx;
 553         }
 554         st->us = spi;
 555         mutex_init(&st->buf_lock);
 556         /* setup the industrialio driver allocated elements */
 557         st->indio_dev = iio_allocate_device(0);
 558         if (st->indio_dev == NULL) {
 559                 ret = -ENOMEM;
 560                 goto error_free_tx;
 561         }
 562
 563         st->indio_dev->name = spi->dev.driver->name;
 564         st->indio_dev->dev.parent = &spi->dev;
 565         st->indio_dev->attrs = &ade7754_attribute_group;
 566         st->indio_dev->dev_data = (void *)(st);
 567         st->indio_dev->driver_module = THIS_MODULE;
 568         st->indio_dev->modes = INDIO_DIRECT_MODE;
 569
 570         ret = iio_device_register(st->indio_dev);
 571         if (ret)
 572                 goto error_free_dev;
 573         regdone = 1;
 574
 575         /* Get the device into a sane initial state */
 576         ret = ade7754_initial_setup(st);
 577         if (ret)
 578                 goto error_free_dev;
 579         return 0;
 580
 581 error_free_dev:
 582         if (regdone)
 583                 iio_device_unregister(st->indio_dev);
 584         else
 585                 iio_free_device(st->indio_dev);
 586 error_free_tx:
 587         kfree(st->tx);
 588 error_free_rx:
 589         kfree(st->rx);
 590 error_free_st:
 591         kfree(st);
 592 error_ret:
 593         return ret;
 594 }
 595
 596 /* fixme, confirm ordering in this function */
 597 static int ade7754_remove(struct spi_device *spi)
 598 {
 599         int ret;
 600         struct ade7754_state *st = spi_get_drvdata(spi);
 601         struct iio_dev *indio_dev = st->indio_dev;
 602
 603         ret = ade7754_stop_device(&(indio_dev->dev));
 604         if (ret)
 605                 goto err_ret;
 606
 607         iio_device_unregister(indio_dev);
 608         kfree(st->tx);
 609         kfree(st->rx);
 610         kfree(st);
 611
 612         return 0;
 613
 614 err_ret:
 615         return ret;
 616 }
 617
 618 static struct spi_driver ade7754_driver = {
 619         .driver = {
 620                 .name = "ade7754",
 621                 .owner = THIS_MODULE,
 622         },
 623         .probe = ade7754_probe,
 624         .remove = __devexit_p(ade7754_remove),
 625 };
 626
 627 static __init int ade7754_init(void)
 628 {
 629         return spi_register_driver(&ade7754_driver);
 630 }
 631 module_init(ade7754_init);
 632
 633 static __exit void ade7754_exit(void)
 634 {
 635         spi_unregister_driver(&ade7754_driver);
 636 }
 637 module_exit(ade7754_exit);
 638
 639 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
 640 MODULE_DESCRIPTION("Analog Devices ADE7754 Polyphase Multifunction Energy Metering IC Driver");
 641 MODULE_LICENSE("GPL v2");