Pileus Git - ~andy/linux/blob - 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/delay.h>
  12 #include <linux/mutex.h>
  13 #include <linux/device.h>
  14 #include <linux/kernel.h>
  15 #include <linux/spi/spi.h>
  16 #include <linux/slab.h>
  17 #include <linux/sysfs.h>
  18 #include <linux/list.h>
  19 #include <linux/module.h>
  20
  21 #include <linux/iio/iio.h>
  22 #include <linux/iio/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_to_iio_dev(dev);
  32         struct ade7754_state *st = iio_priv(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_to_iio_dev(dev);
  50         struct ade7754_state *st = iio_priv(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_to_iio_dev(dev);
  67         struct ade7754_state *st = iio_priv(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_to_iio_dev(dev);
  86         struct ade7754_state *st = iio_priv(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 iio_dev *indio_dev = dev_to_iio_dev(dev);
 107         struct ade7754_state *st = iio_priv(indio_dev);
 108         int ret;
 109         struct spi_transfer xfers[] = {
 110                 {
 111                         .tx_buf = st->tx,
 112                         .rx_buf = st->rx,
 113                         .bits_per_word = 8,
 114                         .len = 4,
 115                 },
 116         };
 117
 118         mutex_lock(&st->buf_lock);
 119         st->tx[0] = ADE7754_READ_REG(reg_address);
 120         st->tx[1] = 0;
 121         st->tx[2] = 0;
 122         st->tx[3] = 0;
 123
 124         ret = spi_sync_transfer(st->us, xfers, ARRAY_SIZE(xfers));
 125         if (ret) {
 126                 dev_err(&st->us->dev, "problem when reading 24 bit register 0x%02X",
 127                                 reg_address);
 128                 goto error_ret;
 129         }
 130         *val = (st->rx[1] << 16) | (st->rx[2] << 8) | st->rx[3];
 131
 132 error_ret:
 133         mutex_unlock(&st->buf_lock);
 134         return ret;
 135 }
 136
 137 static ssize_t ade7754_read_8bit(struct device *dev,
 138                 struct device_attribute *attr,
 139                 char *buf)
 140 {
 141         int ret;
 142         u8 val = 0;
 143         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 144
 145         ret = ade7754_spi_read_reg_8(dev, this_attr->address, &val);
 146         if (ret)
 147                 return ret;
 148
 149         return sprintf(buf, "%u\n", val);
 150 }
 151
 152 static ssize_t ade7754_read_16bit(struct device *dev,
 153                 struct device_attribute *attr,
 154                 char *buf)
 155 {
 156         int ret;
 157         u16 val = 0;
 158         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 159
 160         ret = ade7754_spi_read_reg_16(dev, this_attr->address, &val);
 161         if (ret)
 162                 return ret;
 163
 164         return sprintf(buf, "%u\n", val);
 165 }
 166
 167 static ssize_t ade7754_read_24bit(struct device *dev,
 168                 struct device_attribute *attr,
 169                 char *buf)
 170 {
 171         int ret;
 172         u32 val = 0;
 173         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 174
 175         ret = ade7754_spi_read_reg_24(dev, this_attr->address, &val);
 176         if (ret)
 177                 return ret;
 178
 179         return sprintf(buf, "%u\n", val & 0xFFFFFF);
 180 }
 181
 182 static ssize_t ade7754_write_8bit(struct device *dev,
 183                 struct device_attribute *attr,
 184                 const char *buf,
 185                 size_t len)
 186 {
 187         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 188         int ret;
 189         long val;
 190
 191         ret = strict_strtol(buf, 10, &val);
 192         if (ret)
 193                 goto error_ret;
 194         ret = ade7754_spi_write_reg_8(dev, this_attr->address, val);
 195
 196 error_ret:
 197         return ret ? ret : len;
 198 }
 199
 200 static ssize_t ade7754_write_16bit(struct device *dev,
 201                 struct device_attribute *attr,
 202                 const char *buf,
 203                 size_t len)
 204 {
 205         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 206         int ret;
 207         long val;
 208
 209         ret = strict_strtol(buf, 10, &val);
 210         if (ret)
 211                 goto error_ret;
 212         ret = ade7754_spi_write_reg_16(dev, this_attr->address, val);
 213
 214 error_ret:
 215         return ret ? ret : len;
 216 }
 217
 218 static int ade7754_reset(struct device *dev)
 219 {
 220         u8 val;
 221
 222         ade7754_spi_read_reg_8(dev, ADE7754_OPMODE, &val);
 223         val |= 1 << 6; /* Software Chip Reset */
 224         return ade7754_spi_write_reg_8(dev, ADE7754_OPMODE, val);
 225 }
 226
 227
 228 static ssize_t ade7754_write_reset(struct device *dev,
 229                 struct device_attribute *attr,
 230                 const char *buf, size_t len)
 231 {
 232         if (len < 1)
 233                 return -1;
 234         switch (buf[0]) {
 235         case '1':
 236         case 'y':
 237         case 'Y':
 238                 return ade7754_reset(dev);
 239         }
 240         return -1;
 241 }
 242
 243 static IIO_DEV_ATTR_AENERGY(ade7754_read_24bit, ADE7754_AENERGY);
 244 static IIO_DEV_ATTR_LAENERGY(ade7754_read_24bit, ADE7754_LAENERGY);
 245 static IIO_DEV_ATTR_VAENERGY(ade7754_read_24bit, ADE7754_VAENERGY);
 246 static IIO_DEV_ATTR_LVAENERGY(ade7754_read_24bit, ADE7754_LVAENERGY);
 247 static IIO_DEV_ATTR_VPEAK(S_IWUSR | S_IRUGO,
 248                 ade7754_read_8bit,
 249                 ade7754_write_8bit,
 250                 ADE7754_VPEAK);
 251 static IIO_DEV_ATTR_IPEAK(S_IWUSR | S_IRUGO,
 252                 ade7754_read_8bit,
 253                 ade7754_write_8bit,
 254                 ADE7754_VPEAK);
 255 static IIO_DEV_ATTR_APHCAL(S_IWUSR | S_IRUGO,
 256                 ade7754_read_8bit,
 257                 ade7754_write_8bit,
 258                 ADE7754_APHCAL);
 259 static IIO_DEV_ATTR_BPHCAL(S_IWUSR | S_IRUGO,
 260                 ade7754_read_8bit,
 261                 ade7754_write_8bit,
 262                 ADE7754_BPHCAL);
 263 static IIO_DEV_ATTR_CPHCAL(S_IWUSR | S_IRUGO,
 264                 ade7754_read_8bit,
 265                 ade7754_write_8bit,
 266                 ADE7754_CPHCAL);
 267 static IIO_DEV_ATTR_AAPOS(S_IWUSR | S_IRUGO,
 268                 ade7754_read_16bit,
 269                 ade7754_write_16bit,
 270                 ADE7754_AAPOS);
 271 static IIO_DEV_ATTR_BAPOS(S_IWUSR | S_IRUGO,
 272                 ade7754_read_16bit,
 273                 ade7754_write_16bit,
 274                 ADE7754_BAPOS);
 275 static IIO_DEV_ATTR_CAPOS(S_IWUSR | S_IRUGO,
 276                 ade7754_read_16bit,
 277                 ade7754_write_16bit,
 278                 ADE7754_CAPOS);
 279 static IIO_DEV_ATTR_WDIV(S_IWUSR | S_IRUGO,
 280                 ade7754_read_8bit,
 281                 ade7754_write_8bit,
 282                 ADE7754_WDIV);
 283 static IIO_DEV_ATTR_VADIV(S_IWUSR | S_IRUGO,
 284                 ade7754_read_8bit,
 285                 ade7754_write_8bit,
 286                 ADE7754_VADIV);
 287 static IIO_DEV_ATTR_CFNUM(S_IWUSR | S_IRUGO,
 288                 ade7754_read_16bit,
 289                 ade7754_write_16bit,
 290                 ADE7754_CFNUM);
 291 static IIO_DEV_ATTR_CFDEN(S_IWUSR | S_IRUGO,
 292                 ade7754_read_16bit,
 293                 ade7754_write_16bit,
 294                 ADE7754_CFDEN);
 295 static IIO_DEV_ATTR_ACTIVE_POWER_A_GAIN(S_IWUSR | S_IRUGO,
 296                 ade7754_read_16bit,
 297                 ade7754_write_16bit,
 298                 ADE7754_AAPGAIN);
 299 static IIO_DEV_ATTR_ACTIVE_POWER_B_GAIN(S_IWUSR | S_IRUGO,
 300                 ade7754_read_16bit,
 301                 ade7754_write_16bit,
 302                 ADE7754_BAPGAIN);
 303 static IIO_DEV_ATTR_ACTIVE_POWER_C_GAIN(S_IWUSR | S_IRUGO,
 304                 ade7754_read_16bit,
 305                 ade7754_write_16bit,
 306                 ADE7754_CAPGAIN);
 307 static IIO_DEV_ATTR_AIRMS(S_IRUGO,
 308                 ade7754_read_24bit,
 309                 NULL,
 310                 ADE7754_AIRMS);
 311 static IIO_DEV_ATTR_BIRMS(S_IRUGO,
 312                 ade7754_read_24bit,
 313                 NULL,
 314                 ADE7754_BIRMS);
 315 static IIO_DEV_ATTR_CIRMS(S_IRUGO,
 316                 ade7754_read_24bit,
 317                 NULL,
 318                 ADE7754_CIRMS);
 319 static IIO_DEV_ATTR_AVRMS(S_IRUGO,
 320                 ade7754_read_24bit,
 321                 NULL,
 322                 ADE7754_AVRMS);
 323 static IIO_DEV_ATTR_BVRMS(S_IRUGO,
 324                 ade7754_read_24bit,
 325                 NULL,
 326                 ADE7754_BVRMS);
 327 static IIO_DEV_ATTR_CVRMS(S_IRUGO,
 328                 ade7754_read_24bit,
 329                 NULL,
 330                 ADE7754_CVRMS);
 331 static IIO_DEV_ATTR_AIRMSOS(S_IRUGO,
 332                 ade7754_read_16bit,
 333                 ade7754_write_16bit,
 334                 ADE7754_AIRMSOS);
 335 static IIO_DEV_ATTR_BIRMSOS(S_IRUGO,
 336                 ade7754_read_16bit,
 337                 ade7754_write_16bit,
 338                 ADE7754_BIRMSOS);
 339 static IIO_DEV_ATTR_CIRMSOS(S_IRUGO,
 340                 ade7754_read_16bit,
 341                 ade7754_write_16bit,
 342                 ADE7754_CIRMSOS);
 343 static IIO_DEV_ATTR_AVRMSOS(S_IRUGO,
 344                 ade7754_read_16bit,
 345                 ade7754_write_16bit,
 346                 ADE7754_AVRMSOS);
 347 static IIO_DEV_ATTR_BVRMSOS(S_IRUGO,
 348                 ade7754_read_16bit,
 349                 ade7754_write_16bit,
 350                 ADE7754_BVRMSOS);
 351 static IIO_DEV_ATTR_CVRMSOS(S_IRUGO,
 352                 ade7754_read_16bit,
 353                 ade7754_write_16bit,
 354                 ADE7754_CVRMSOS);
 355
 356 static int ade7754_set_irq(struct device *dev, bool enable)
 357 {
 358         int ret;
 359         u16 irqen;
 360         ret = ade7754_spi_read_reg_16(dev, ADE7754_IRQEN, &irqen);
 361         if (ret)
 362                 goto error_ret;
 363
 364         if (enable)
 365                 irqen |= 1 << 14; /* Enables an interrupt when a data is
 366                                      present in the waveform register */
 367         else
 368                 irqen &= ~(1 << 14);
 369
 370         ret = ade7754_spi_write_reg_16(dev, ADE7754_IRQEN, irqen);
 371         if (ret)
 372                 goto error_ret;
 373
 374 error_ret:
 375         return ret;
 376 }
 377
 378 /* Power down the device */
 379 static int ade7754_stop_device(struct device *dev)
 380 {
 381         u8 val;
 382
 383         ade7754_spi_read_reg_8(dev, ADE7754_OPMODE, &val);
 384         val |= 7 << 3;  /* ADE7754 powered down */
 385         return ade7754_spi_write_reg_8(dev, ADE7754_OPMODE, val);
 386 }
 387
 388 static int ade7754_initial_setup(struct iio_dev *indio_dev)
 389 {
 390         int ret;
 391         struct ade7754_state *st = iio_priv(indio_dev);
 392         struct device *dev = &indio_dev->dev;
 393
 394         /* use low spi speed for init */
 395         st->us->mode = SPI_MODE_3;
 396         spi_setup(st->us);
 397
 398         /* Disable IRQ */
 399         ret = ade7754_set_irq(dev, false);
 400         if (ret) {
 401                 dev_err(dev, "disable irq failed");
 402                 goto err_ret;
 403         }
 404
 405         ade7754_reset(dev);
 406         msleep(ADE7754_STARTUP_DELAY);
 407
 408 err_ret:
 409         return ret;
 410 }
 411
 412 static ssize_t ade7754_read_frequency(struct device *dev,
 413                 struct device_attribute *attr,
 414                 char *buf)
 415 {
 416         int ret;
 417         u8 t;
 418         int sps;
 419         ret = ade7754_spi_read_reg_8(dev,
 420                         ADE7754_WAVMODE,
 421                         &t);
 422         if (ret)
 423                 return ret;
 424
 425         t = (t >> 3) & 0x3;
 426         sps = 26000 / (1 + t);
 427
 428         return sprintf(buf, "%d\n", sps);
 429 }
 430
 431 static ssize_t ade7754_write_frequency(struct device *dev,
 432                 struct device_attribute *attr,
 433                 const char *buf,
 434                 size_t len)
 435 {
 436         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 437         struct ade7754_state *st = iio_priv(indio_dev);
 438         unsigned long val;
 439         int ret;
 440         u8 reg, t;
 441
 442         ret = strict_strtol(buf, 10, &val);
 443         if (ret)
 444                 return ret;
 445         if (val == 0)
 446                 return -EINVAL;
 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(in_temp_offset, "129 C");
 475 static IIO_CONST_ATTR(in_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_in_temp_raw.dev_attr.attr,
 487         &iio_const_attr_in_temp_offset.dev_attr.attr,
 488         &iio_const_attr_in_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 static const struct iio_info ade7754_info = {
 531         .attrs = &ade7754_attribute_group,
 532         .driver_module = THIS_MODULE,
 533 };
 534
 535 static int ade7754_probe(struct spi_device *spi)
 536 {
 537         int ret;
 538         struct ade7754_state *st;
 539         struct iio_dev *indio_dev;
 540
 541         /* setup the industrialio driver allocated elements */
 542         indio_dev = iio_device_alloc(sizeof(*st));
 543         if (indio_dev == NULL) {
 544                 ret = -ENOMEM;
 545                 goto error_ret;
 546         }
 547         /* this is only used for removal purposes */
 548         spi_set_drvdata(spi, indio_dev);
 549
 550         st = iio_priv(indio_dev);
 551         st->us = spi;
 552         mutex_init(&st->buf_lock);
 553
 554         indio_dev->name = spi->dev.driver->name;
 555         indio_dev->dev.parent = &spi->dev;
 556         indio_dev->info = &ade7754_info;
 557         indio_dev->modes = INDIO_DIRECT_MODE;
 558
 559         /* Get the device into a sane initial state */
 560         ret = ade7754_initial_setup(indio_dev);
 561         if (ret)
 562                 goto error_free_dev;
 563         ret = iio_device_register(indio_dev);
 564         if (ret)
 565                 goto error_free_dev;
 566
 567         return 0;
 568
 569 error_free_dev:
 570         iio_device_free(indio_dev);
 571
 572 error_ret:
 573         return ret;
 574 }
 575
 576 /* fixme, confirm ordering in this function */
 577 static int ade7754_remove(struct spi_device *spi)
 578 {
 579         struct iio_dev *indio_dev = spi_get_drvdata(spi);
 580
 581         iio_device_unregister(indio_dev);
 582         ade7754_stop_device(&indio_dev->dev);
 583         iio_device_free(indio_dev);
 584
 585         return 0;
 586 }
 587
 588 static struct spi_driver ade7754_driver = {
 589         .driver = {
 590                 .name = "ade7754",
 591                 .owner = THIS_MODULE,
 592         },
 593         .probe = ade7754_probe,
 594         .remove = ade7754_remove,
 595 };
 596 module_spi_driver(ade7754_driver);
 597
 598 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
 599 MODULE_DESCRIPTION("Analog Devices ADE7754 Polyphase Multifunction Energy Metering IC Driver");
 600 MODULE_LICENSE("GPL v2");
 601 MODULE_ALIAS("spi:ad7754");