drivers/staging/iio/meter/ade7753.c

   1 /*
   2  * ADE7753 Single-Phase Multifunction Metering IC with di/dt Sensor Interface
   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 "ade7753.h"
  25
  26 static int ade7753_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 ade7753_state *st = iio_priv(indio_dev);
  33
  34         mutex_lock(&st->buf_lock);
  35         st->tx[0] = ADE7753_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 ade7753_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 ade7753_state *st = iio_priv(indio_dev);
  51
  52         mutex_lock(&st->buf_lock);
  53         st->tx[0] = ADE7753_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 ade7753_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 ade7753_state *st = iio_priv(indio_dev);
  68         ssize_t ret;
  69
  70         ret = spi_w8r8(st->us, ADE7753_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 ade7753_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 ade7753_state *st = iio_priv(indio_dev);
  87         ssize_t ret;
  88
  89         ret = spi_w8r16be(st->us, ADE7753_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
  98         return 0;
  99 }
 100
 101 static int ade7753_spi_read_reg_24(struct device *dev,
 102                 u8 reg_address,
 103                 u32 *val)
 104 {
 105         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 106         struct ade7753_state *st = iio_priv(indio_dev);
 107         int ret;
 108         struct spi_transfer xfers[] = {
 109                 {
 110                         .tx_buf = st->tx,
 111                         .bits_per_word = 8,
 112                         .len = 1,
 113                 }, {
 114                         .rx_buf = st->tx,
 115                         .bits_per_word = 8,
 116                         .len = 3,
 117                 }
 118         };
 119
 120         mutex_lock(&st->buf_lock);
 121         st->tx[0] = ADE7753_READ_REG(reg_address);
 122
 123         ret = spi_sync_transfer(st->us, xfers, ARRAY_SIZE(xfers));
 124         if (ret) {
 125                 dev_err(&st->us->dev, "problem when reading 24 bit register 0x%02X",
 126                                 reg_address);
 127                 goto error_ret;
 128         }
 129         *val = (st->rx[0] << 16) | (st->rx[1] << 8) | st->rx[2];
 130
 131 error_ret:
 132         mutex_unlock(&st->buf_lock);
 133         return ret;
 134 }
 135
 136 static ssize_t ade7753_read_8bit(struct device *dev,
 137                 struct device_attribute *attr,
 138                 char *buf)
 139 {
 140         int ret;
 141         u8 val;
 142         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 143
 144         ret = ade7753_spi_read_reg_8(dev, this_attr->address, &val);
 145         if (ret)
 146                 return ret;
 147
 148         return sprintf(buf, "%u\n", val);
 149 }
 150
 151 static ssize_t ade7753_read_16bit(struct device *dev,
 152                 struct device_attribute *attr,
 153                 char *buf)
 154 {
 155         int ret;
 156         u16 val;
 157         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 158
 159         ret = ade7753_spi_read_reg_16(dev, this_attr->address, &val);
 160         if (ret)
 161                 return ret;
 162
 163         return sprintf(buf, "%u\n", val);
 164 }
 165
 166 static ssize_t ade7753_read_24bit(struct device *dev,
 167                 struct device_attribute *attr,
 168                 char *buf)
 169 {
 170         int ret;
 171         u32 val;
 172         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 173
 174         ret = ade7753_spi_read_reg_24(dev, this_attr->address, &val);
 175         if (ret)
 176                 return ret;
 177
 178         return sprintf(buf, "%u\n", val);
 179 }
 180
 181 static ssize_t ade7753_write_8bit(struct device *dev,
 182                 struct device_attribute *attr,
 183                 const char *buf,
 184                 size_t len)
 185 {
 186         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 187         int ret;
 188         u8 val;
 189
 190         ret = kstrtou8(buf, 10, &val);
 191         if (ret)
 192                 goto error_ret;
 193         ret = ade7753_spi_write_reg_8(dev, this_attr->address, val);
 194
 195 error_ret:
 196         return ret ? ret : len;
 197 }
 198
 199 static ssize_t ade7753_write_16bit(struct device *dev,
 200                 struct device_attribute *attr,
 201                 const char *buf,
 202                 size_t len)
 203 {
 204         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 205         int ret;
 206         u16 val;
 207
 208         ret = kstrtou16(buf, 10, &val);
 209         if (ret)
 210                 goto error_ret;
 211         ret = ade7753_spi_write_reg_16(dev, this_attr->address, val);
 212
 213 error_ret:
 214         return ret ? ret : len;
 215 }
 216
 217 static int ade7753_reset(struct device *dev)
 218 {
 219         u16 val;
 220
 221         ade7753_spi_read_reg_16(dev, ADE7753_MODE, &val);
 222         val |= 1 << 6; /* Software Chip Reset */
 223
 224         return ade7753_spi_write_reg_16(dev, ADE7753_MODE, val);
 225 }
 226
 227 static IIO_DEV_ATTR_AENERGY(ade7753_read_24bit, ADE7753_AENERGY);
 228 static IIO_DEV_ATTR_LAENERGY(ade7753_read_24bit, ADE7753_LAENERGY);
 229 static IIO_DEV_ATTR_VAENERGY(ade7753_read_24bit, ADE7753_VAENERGY);
 230 static IIO_DEV_ATTR_LVAENERGY(ade7753_read_24bit, ADE7753_LVAENERGY);
 231 static IIO_DEV_ATTR_CFDEN(S_IWUSR | S_IRUGO,
 232                 ade7753_read_16bit,
 233                 ade7753_write_16bit,
 234                 ADE7753_CFDEN);
 235 static IIO_DEV_ATTR_CFNUM(S_IWUSR | S_IRUGO,
 236                 ade7753_read_8bit,
 237                 ade7753_write_8bit,
 238                 ADE7753_CFNUM);
 239 static IIO_DEV_ATTR_CHKSUM(ade7753_read_8bit, ADE7753_CHKSUM);
 240 static IIO_DEV_ATTR_PHCAL(S_IWUSR | S_IRUGO,
 241                 ade7753_read_16bit,
 242                 ade7753_write_16bit,
 243                 ADE7753_PHCAL);
 244 static IIO_DEV_ATTR_APOS(S_IWUSR | S_IRUGO,
 245                 ade7753_read_16bit,
 246                 ade7753_write_16bit,
 247                 ADE7753_APOS);
 248 static IIO_DEV_ATTR_SAGCYC(S_IWUSR | S_IRUGO,
 249                 ade7753_read_8bit,
 250                 ade7753_write_8bit,
 251                 ADE7753_SAGCYC);
 252 static IIO_DEV_ATTR_SAGLVL(S_IWUSR | S_IRUGO,
 253                 ade7753_read_8bit,
 254                 ade7753_write_8bit,
 255                 ADE7753_SAGLVL);
 256 static IIO_DEV_ATTR_LINECYC(S_IWUSR | S_IRUGO,
 257                 ade7753_read_8bit,
 258                 ade7753_write_8bit,
 259                 ADE7753_LINECYC);
 260 static IIO_DEV_ATTR_WDIV(S_IWUSR | S_IRUGO,
 261                 ade7753_read_8bit,
 262                 ade7753_write_8bit,
 263                 ADE7753_WDIV);
 264 static IIO_DEV_ATTR_IRMS(S_IWUSR | S_IRUGO,
 265                 ade7753_read_24bit,
 266                 NULL,
 267                 ADE7753_IRMS);
 268 static IIO_DEV_ATTR_VRMS(S_IRUGO,
 269                 ade7753_read_24bit,
 270                 NULL,
 271                 ADE7753_VRMS);
 272 static IIO_DEV_ATTR_IRMSOS(S_IWUSR | S_IRUGO,
 273                 ade7753_read_16bit,
 274                 ade7753_write_16bit,
 275                 ADE7753_IRMSOS);
 276 static IIO_DEV_ATTR_VRMSOS(S_IWUSR | S_IRUGO,
 277                 ade7753_read_16bit,
 278                 ade7753_write_16bit,
 279                 ADE7753_VRMSOS);
 280 static IIO_DEV_ATTR_WGAIN(S_IWUSR | S_IRUGO,
 281                 ade7753_read_16bit,
 282                 ade7753_write_16bit,
 283                 ADE7753_WGAIN);
 284 static IIO_DEV_ATTR_VAGAIN(S_IWUSR | S_IRUGO,
 285                 ade7753_read_16bit,
 286                 ade7753_write_16bit,
 287                 ADE7753_VAGAIN);
 288 static IIO_DEV_ATTR_PGA_GAIN(S_IWUSR | S_IRUGO,
 289                 ade7753_read_16bit,
 290                 ade7753_write_16bit,
 291                 ADE7753_GAIN);
 292 static IIO_DEV_ATTR_IPKLVL(S_IWUSR | S_IRUGO,
 293                 ade7753_read_8bit,
 294                 ade7753_write_8bit,
 295                 ADE7753_IPKLVL);
 296 static IIO_DEV_ATTR_VPKLVL(S_IWUSR | S_IRUGO,
 297                 ade7753_read_8bit,
 298                 ade7753_write_8bit,
 299                 ADE7753_VPKLVL);
 300 static IIO_DEV_ATTR_IPEAK(S_IRUGO,
 301                 ade7753_read_24bit,
 302                 NULL,
 303                 ADE7753_IPEAK);
 304 static IIO_DEV_ATTR_VPEAK(S_IRUGO,
 305                 ade7753_read_24bit,
 306                 NULL,
 307                 ADE7753_VPEAK);
 308 static IIO_DEV_ATTR_VPERIOD(S_IRUGO,
 309                 ade7753_read_16bit,
 310                 NULL,
 311                 ADE7753_PERIOD);
 312 static IIO_DEV_ATTR_CH_OFF(1, S_IWUSR | S_IRUGO,
 313                 ade7753_read_8bit,
 314                 ade7753_write_8bit,
 315                 ADE7753_CH1OS);
 316 static IIO_DEV_ATTR_CH_OFF(2, S_IWUSR | S_IRUGO,
 317                 ade7753_read_8bit,
 318                 ade7753_write_8bit,
 319                 ADE7753_CH2OS);
 320
 321 static int ade7753_set_irq(struct device *dev, bool enable)
 322 {
 323         int ret;
 324         u8 irqen;
 325         ret = ade7753_spi_read_reg_8(dev, ADE7753_IRQEN, &irqen);
 326         if (ret)
 327                 goto error_ret;
 328
 329         if (enable)
 330                 irqen |= 1 << 3; /* Enables an interrupt when a data is
 331                                     present in the waveform register */
 332         else
 333                 irqen &= ~(1 << 3);
 334
 335         ret = ade7753_spi_write_reg_8(dev, ADE7753_IRQEN, irqen);
 336
 337 error_ret:
 338         return ret;
 339 }
 340
 341 /* Power down the device */
 342 static int ade7753_stop_device(struct device *dev)
 343 {
 344         u16 val;
 345
 346         ade7753_spi_read_reg_16(dev, ADE7753_MODE, &val);
 347         val |= 1 << 4;  /* AD converters can be turned off */
 348
 349         return ade7753_spi_write_reg_16(dev, ADE7753_MODE, val);
 350 }
 351
 352 static int ade7753_initial_setup(struct iio_dev *indio_dev)
 353 {
 354         int ret;
 355         struct device *dev = &indio_dev->dev;
 356         struct ade7753_state *st = iio_priv(indio_dev);
 357
 358         /* use low spi speed for init */
 359         st->us->mode = SPI_MODE_3;
 360         spi_setup(st->us);
 361
 362         /* Disable IRQ */
 363         ret = ade7753_set_irq(dev, false);
 364         if (ret) {
 365                 dev_err(dev, "disable irq failed");
 366                 goto err_ret;
 367         }
 368
 369         ade7753_reset(dev);
 370         msleep(ADE7753_STARTUP_DELAY);
 371
 372 err_ret:
 373         return ret;
 374 }
 375
 376 static ssize_t ade7753_read_frequency(struct device *dev,
 377                 struct device_attribute *attr,
 378                 char *buf)
 379 {
 380         int ret, len = 0;
 381         u16 t;
 382         int sps;
 383         ret = ade7753_spi_read_reg_16(dev, ADE7753_MODE, &t);
 384         if (ret)
 385                 return ret;
 386
 387         t = (t >> 11) & 0x3;
 388         sps = 27900 / (1 + t);
 389
 390         len = sprintf(buf, "%d\n", sps);
 391         return len;
 392 }
 393
 394 static ssize_t ade7753_write_frequency(struct device *dev,
 395                 struct device_attribute *attr,
 396                 const char *buf,
 397                 size_t len)
 398 {
 399         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 400         struct ade7753_state *st = iio_priv(indio_dev);
 401         u16 val;
 402         int ret;
 403         u16 reg, t;
 404
 405         ret = kstrtou16(buf, 10, &val);
 406         if (ret)
 407                 return ret;
 408         if (val == 0)
 409                 return -EINVAL;
 410
 411         mutex_lock(&indio_dev->mlock);
 412
 413         t = (27900 / val);
 414         if (t > 0)
 415                 t--;
 416
 417         if (t > 1)
 418                 st->us->max_speed_hz = ADE7753_SPI_SLOW;
 419         else
 420                 st->us->max_speed_hz = ADE7753_SPI_FAST;
 421
 422         ret = ade7753_spi_read_reg_16(dev, ADE7753_MODE, &reg);
 423         if (ret)
 424                 goto out;
 425
 426         reg &= ~(3 << 11);
 427         reg |= t << 11;
 428
 429         ret = ade7753_spi_write_reg_16(dev, ADE7753_MODE, reg);
 430
 431 out:
 432         mutex_unlock(&indio_dev->mlock);
 433
 434         return ret ? ret : len;
 435 }
 436
 437 static IIO_DEV_ATTR_TEMP_RAW(ade7753_read_8bit);
 438 static IIO_CONST_ATTR(in_temp_offset, "-25 C");
 439 static IIO_CONST_ATTR(in_temp_scale, "0.67 C");
 440
 441 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
 442                 ade7753_read_frequency,
 443                 ade7753_write_frequency);
 444
 445 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("27900 14000 7000 3500");
 446
 447 static struct attribute *ade7753_attributes[] = {
 448         &iio_dev_attr_in_temp_raw.dev_attr.attr,
 449         &iio_const_attr_in_temp_offset.dev_attr.attr,
 450         &iio_const_attr_in_temp_scale.dev_attr.attr,
 451         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 452         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 453         &iio_dev_attr_phcal.dev_attr.attr,
 454         &iio_dev_attr_cfden.dev_attr.attr,
 455         &iio_dev_attr_aenergy.dev_attr.attr,
 456         &iio_dev_attr_laenergy.dev_attr.attr,
 457         &iio_dev_attr_vaenergy.dev_attr.attr,
 458         &iio_dev_attr_lvaenergy.dev_attr.attr,
 459         &iio_dev_attr_cfnum.dev_attr.attr,
 460         &iio_dev_attr_apos.dev_attr.attr,
 461         &iio_dev_attr_sagcyc.dev_attr.attr,
 462         &iio_dev_attr_saglvl.dev_attr.attr,
 463         &iio_dev_attr_linecyc.dev_attr.attr,
 464         &iio_dev_attr_chksum.dev_attr.attr,
 465         &iio_dev_attr_pga_gain.dev_attr.attr,
 466         &iio_dev_attr_wgain.dev_attr.attr,
 467         &iio_dev_attr_choff_1.dev_attr.attr,
 468         &iio_dev_attr_choff_2.dev_attr.attr,
 469         &iio_dev_attr_wdiv.dev_attr.attr,
 470         &iio_dev_attr_irms.dev_attr.attr,
 471         &iio_dev_attr_vrms.dev_attr.attr,
 472         &iio_dev_attr_irmsos.dev_attr.attr,
 473         &iio_dev_attr_vrmsos.dev_attr.attr,
 474         &iio_dev_attr_vagain.dev_attr.attr,
 475         &iio_dev_attr_ipklvl.dev_attr.attr,
 476         &iio_dev_attr_vpklvl.dev_attr.attr,
 477         &iio_dev_attr_ipeak.dev_attr.attr,
 478         &iio_dev_attr_vpeak.dev_attr.attr,
 479         &iio_dev_attr_vperiod.dev_attr.attr,
 480         NULL,
 481 };
 482
 483 static const struct attribute_group ade7753_attribute_group = {
 484         .attrs = ade7753_attributes,
 485 };
 486
 487 static const struct iio_info ade7753_info = {
 488         .attrs = &ade7753_attribute_group,
 489         .driver_module = THIS_MODULE,
 490 };
 491
 492 static int ade7753_probe(struct spi_device *spi)
 493 {
 494         int ret;
 495         struct ade7753_state *st;
 496         struct iio_dev *indio_dev;
 497
 498         /* setup the industrialio driver allocated elements */
 499         indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
 500         if (!indio_dev)
 501                 return -ENOMEM;
 502         /* this is only used for removal purposes */
 503         spi_set_drvdata(spi, indio_dev);
 504
 505         st = iio_priv(indio_dev);
 506         st->us = spi;
 507         mutex_init(&st->buf_lock);
 508
 509         indio_dev->name = spi->dev.driver->name;
 510         indio_dev->dev.parent = &spi->dev;
 511         indio_dev->info = &ade7753_info;
 512         indio_dev->modes = INDIO_DIRECT_MODE;
 513
 514         /* Get the device into a sane initial state */
 515         ret = ade7753_initial_setup(indio_dev);
 516         if (ret)
 517                 return ret;
 518
 519         ret = iio_device_register(indio_dev);
 520         if (ret)
 521                 return ret;
 522
 523         return 0;
 524 }
 525
 526 /* fixme, confirm ordering in this function */
 527 static int ade7753_remove(struct spi_device *spi)
 528 {
 529         struct iio_dev *indio_dev = spi_get_drvdata(spi);
 530
 531         iio_device_unregister(indio_dev);
 532         ade7753_stop_device(&indio_dev->dev);
 533
 534         return 0;
 535 }
 536
 537 static struct spi_driver ade7753_driver = {
 538         .driver = {
 539                 .name = "ade7753",
 540                 .owner = THIS_MODULE,
 541         },
 542         .probe = ade7753_probe,
 543         .remove = ade7753_remove,
 544 };
 545 module_spi_driver(ade7753_driver);
 546
 547 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
 548 MODULE_DESCRIPTION("Analog Devices ADE7753/6 Single-Phase Multifunction Meter");
 549 MODULE_LICENSE("GPL v2");
 550 MODULE_ALIAS("spi:ade7753");