drivers/misc/ad525x_dpot.c

   1 /*
   2  * ad525x_dpot: Driver for the Analog Devices digital potentiometers
   3  * Copyright (c) 2009-2010 Analog Devices, Inc.
   4  * Author: Michael Hennerich <hennerich@blackfin.uclinux.org>
   5  *
   6  * DEVID                #Wipers         #Positions      Resistor Options (kOhm)
   7  * AD5258               1               64              1, 10, 50, 100
   8  * AD5259               1               256             5, 10, 50, 100
   9  * AD5251               2               64              1, 10, 50, 100
  10  * AD5252               2               256             1, 10, 50, 100
  11  * AD5255               3               512             25, 250
  12  * AD5253               4               64              1, 10, 50, 100
  13  * AD5254               4               256             1, 10, 50, 100
  14  * AD5160               1               256             5, 10, 50, 100
  15  * AD5161               1               256             5, 10, 50, 100
  16  * AD5162               2               256             2.5, 10, 50, 100
  17  * AD5165               1               256             100
  18  * AD5200               1               256             10, 50
  19  * AD5201               1               33              10, 50
  20  * AD5203               4               64              10, 100
  21  * AD5204               4               256             10, 50, 100
  22  * AD5206               6               256             10, 50, 100
  23  * AD5207               2               256             10, 50, 100
  24  * AD5231               1               1024            10, 50, 100
  25  * AD5232               2               256             10, 50, 100
  26  * AD5233               4               64              10, 50, 100
  27  * AD5235               2               1024            25, 250
  28  * AD5260               1               256             20, 50, 200
  29  * AD5262               2               256             20, 50, 200
  30  * AD5263               4               256             20, 50, 200
  31  * AD5290               1               256             10, 50, 100
  32  * AD5291               1               256             20, 50, 100  (20-TP)
  33  * AD5292               1               1024            20, 50, 100  (20-TP)
  34  * AD5293               1               1024            20, 50, 100
  35  * AD7376               1               128             10, 50, 100, 1M
  36  * AD8400               1               256             1, 10, 50, 100
  37  * AD8402               2               256             1, 10, 50, 100
  38  * AD8403               4               256             1, 10, 50, 100
  39  * ADN2850              3               512             25, 250
  40  * AD5241               1               256             10, 100, 1M
  41  * AD5246               1               128             5, 10, 50, 100
  42  * AD5247               1               128             5, 10, 50, 100
  43  * AD5245               1               256             5, 10, 50, 100
  44  * AD5243               2               256             2.5, 10, 50, 100
  45  * AD5248               2               256             2.5, 10, 50, 100
  46  * AD5242               2               256             20, 50, 200
  47  * AD5280               1               256             20, 50, 200
  48  * AD5282               2               256             20, 50, 200
  49  * ADN2860              3               512             25, 250
  50  * AD5273               1               64              1, 10, 50, 100 (OTP)
  51  * AD5171               1               64              5, 10, 50, 100 (OTP)
  52  * AD5170               1               256             2.5, 10, 50, 100 (OTP)
  53  * AD5172               2               256             2.5, 10, 50, 100 (OTP)
  54  * AD5173               2               256             2.5, 10, 50, 100 (OTP)
  55  * AD5270               1               1024            20, 50, 100 (50-TP)
  56  * AD5271               1               256             20, 50, 100 (50-TP)
  57  * AD5272               1               1024            20, 50, 100 (50-TP)
  58  * AD5274               1               256             20, 50, 100 (50-TP)
  59  *
  60  * See Documentation/misc-devices/ad525x_dpot.txt for more info.
  61  *
  62  * derived from ad5258.c
  63  * Copyright (c) 2009 Cyber Switching, Inc.
  64  * Author: Chris Verges <chrisv@cyberswitching.com>
  65  *
  66  * derived from ad5252.c
  67  * Copyright (c) 2006-2011 Michael Hennerich <hennerich@blackfin.uclinux.org>
  68  *
  69  * Licensed under the GPL-2 or later.
  70  */
  71
  72 #include <linux/module.h>
  73 #include <linux/device.h>
  74 #include <linux/kernel.h>
  75 #include <linux/delay.h>
  76 #include <linux/slab.h>
  77
  78 #include "ad525x_dpot.h"
  79
  80 /*
  81  * Client data (each client gets its own)
  82  */
  83
  84 struct dpot_data {
  85         struct ad_dpot_bus_data bdata;
  86         struct mutex update_lock;
  87         unsigned rdac_mask;
  88         unsigned max_pos;
  89         unsigned long devid;
  90         unsigned uid;
  91         unsigned feat;
  92         unsigned wipers;
  93         u16 rdac_cache[MAX_RDACS];
  94         DECLARE_BITMAP(otp_en_mask, MAX_RDACS);
  95 };
  96
  97 static inline int dpot_read_d8(struct dpot_data *dpot)
  98 {
  99         return dpot->bdata.bops->read_d8(dpot->bdata.client);
 100 }
 101
 102 static inline int dpot_read_r8d8(struct dpot_data *dpot, u8 reg)
 103 {
 104         return dpot->bdata.bops->read_r8d8(dpot->bdata.client, reg);
 105 }
 106
 107 static inline int dpot_read_r8d16(struct dpot_data *dpot, u8 reg)
 108 {
 109         return dpot->bdata.bops->read_r8d16(dpot->bdata.client, reg);
 110 }
 111
 112 static inline int dpot_write_d8(struct dpot_data *dpot, u8 val)
 113 {
 114         return dpot->bdata.bops->write_d8(dpot->bdata.client, val);
 115 }
 116
 117 static inline int dpot_write_r8d8(struct dpot_data *dpot, u8 reg, u16 val)
 118 {
 119         return dpot->bdata.bops->write_r8d8(dpot->bdata.client, reg, val);
 120 }
 121
 122 static inline int dpot_write_r8d16(struct dpot_data *dpot, u8 reg, u16 val)
 123 {
 124         return dpot->bdata.bops->write_r8d16(dpot->bdata.client, reg, val);
 125 }
 126
 127 static s32 dpot_read_spi(struct dpot_data *dpot, u8 reg)
 128 {
 129         unsigned ctrl = 0;
 130         int value;
 131
 132         if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD))) {
 133
 134                 if (dpot->feat & F_RDACS_WONLY)
 135                         return dpot->rdac_cache[reg & DPOT_RDAC_MASK];
 136                 if (dpot->uid == DPOT_UID(AD5291_ID) ||
 137                         dpot->uid == DPOT_UID(AD5292_ID) ||
 138                         dpot->uid == DPOT_UID(AD5293_ID)) {
 139
 140                         value = dpot_read_r8d8(dpot,
 141                                 DPOT_AD5291_READ_RDAC << 2);
 142
 143                         if (dpot->uid == DPOT_UID(AD5291_ID))
 144                                 value = value >> 2;
 145
 146                         return value;
 147                 } else if (dpot->uid == DPOT_UID(AD5270_ID) ||
 148                         dpot->uid == DPOT_UID(AD5271_ID)) {
 149
 150                         value = dpot_read_r8d8(dpot,
 151                                 DPOT_AD5270_1_2_4_READ_RDAC << 2);
 152
 153                         if (value < 0)
 154                                 return value;
 155
 156                         if (dpot->uid == DPOT_UID(AD5271_ID))
 157                                 value = value >> 2;
 158
 159                         return value;
 160                 }
 161
 162                 ctrl = DPOT_SPI_READ_RDAC;
 163         } else if (reg & DPOT_ADDR_EEPROM) {
 164                 ctrl = DPOT_SPI_READ_EEPROM;
 165         }
 166
 167         if (dpot->feat & F_SPI_16BIT)
 168                 return dpot_read_r8d8(dpot, ctrl);
 169         else if (dpot->feat & F_SPI_24BIT)
 170                 return dpot_read_r8d16(dpot, ctrl);
 171
 172         return -EFAULT;
 173 }
 174
 175 static s32 dpot_read_i2c(struct dpot_data *dpot, u8 reg)
 176 {
 177         int value;
 178         unsigned ctrl = 0;
 179         switch (dpot->uid) {
 180         case DPOT_UID(AD5246_ID):
 181         case DPOT_UID(AD5247_ID):
 182                 return dpot_read_d8(dpot);
 183         case DPOT_UID(AD5245_ID):
 184         case DPOT_UID(AD5241_ID):
 185         case DPOT_UID(AD5242_ID):
 186         case DPOT_UID(AD5243_ID):
 187         case DPOT_UID(AD5248_ID):
 188         case DPOT_UID(AD5280_ID):
 189         case DPOT_UID(AD5282_ID):
 190                 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
 191                         0 : DPOT_AD5282_RDAC_AB;
 192                 return dpot_read_r8d8(dpot, ctrl);
 193         case DPOT_UID(AD5170_ID):
 194         case DPOT_UID(AD5171_ID):
 195         case DPOT_UID(AD5273_ID):
 196                         return dpot_read_d8(dpot);
 197         case DPOT_UID(AD5172_ID):
 198         case DPOT_UID(AD5173_ID):
 199                 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
 200                         0 : DPOT_AD5172_3_A0;
 201                 return dpot_read_r8d8(dpot, ctrl);
 202         case DPOT_UID(AD5272_ID):
 203         case DPOT_UID(AD5274_ID):
 204                         dpot_write_r8d8(dpot,
 205                                 (DPOT_AD5270_1_2_4_READ_RDAC << 2), 0);
 206
 207                         value = dpot_read_r8d16(dpot,
 208                                 DPOT_AD5270_1_2_4_RDAC << 2);
 209
 210                         if (value < 0)
 211                                 return value;
 212                         /*
 213                          * AD5272/AD5274 returns high byte first, however
 214                          * underling smbus expects low byte first.
 215                          */
 216                         value = swab16(value);
 217
 218                         if (dpot->uid == DPOT_UID(AD5271_ID))
 219                                 value = value >> 2;
 220                 return value;
 221         default:
 222                 if ((reg & DPOT_REG_TOL) || (dpot->max_pos > 256))
 223                         return dpot_read_r8d16(dpot, (reg & 0xF8) |
 224                                         ((reg & 0x7) << 1));
 225                 else
 226                         return dpot_read_r8d8(dpot, reg);
 227         }
 228 }
 229
 230 static s32 dpot_read(struct dpot_data *dpot, u8 reg)
 231 {
 232         if (dpot->feat & F_SPI)
 233                 return dpot_read_spi(dpot, reg);
 234         else
 235                 return dpot_read_i2c(dpot, reg);
 236 }
 237
 238 static s32 dpot_write_spi(struct dpot_data *dpot, u8 reg, u16 value)
 239 {
 240         unsigned val = 0;
 241
 242         if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD | DPOT_ADDR_OTP))) {
 243                 if (dpot->feat & F_RDACS_WONLY)
 244                         dpot->rdac_cache[reg & DPOT_RDAC_MASK] = value;
 245
 246                 if (dpot->feat & F_AD_APPDATA) {
 247                         if (dpot->feat & F_SPI_8BIT) {
 248                                 val = ((reg & DPOT_RDAC_MASK) <<
 249                                         DPOT_MAX_POS(dpot->devid)) |
 250                                         value;
 251                                 return dpot_write_d8(dpot, val);
 252                         } else if (dpot->feat & F_SPI_16BIT) {
 253                                 val = ((reg & DPOT_RDAC_MASK) <<
 254                                         DPOT_MAX_POS(dpot->devid)) |
 255                                         value;
 256                                 return dpot_write_r8d8(dpot, val >> 8,
 257                                         val & 0xFF);
 258                         } else
 259                                 BUG();
 260                 } else {
 261                         if (dpot->uid == DPOT_UID(AD5291_ID) ||
 262                                 dpot->uid == DPOT_UID(AD5292_ID) ||
 263                                 dpot->uid == DPOT_UID(AD5293_ID)) {
 264
 265                                 dpot_write_r8d8(dpot, DPOT_AD5291_CTRLREG << 2,
 266                                                 DPOT_AD5291_UNLOCK_CMD);
 267
 268                                 if (dpot->uid == DPOT_UID(AD5291_ID))
 269                                         value = value << 2;
 270
 271                                 return dpot_write_r8d8(dpot,
 272                                         (DPOT_AD5291_RDAC << 2) |
 273                                         (value >> 8), value & 0xFF);
 274                         } else if (dpot->uid == DPOT_UID(AD5270_ID) ||
 275                                 dpot->uid == DPOT_UID(AD5271_ID)) {
 276                                 dpot_write_r8d8(dpot,
 277                                                 DPOT_AD5270_1_2_4_CTRLREG << 2,
 278                                                 DPOT_AD5270_1_2_4_UNLOCK_CMD);
 279
 280                                 if (dpot->uid == DPOT_UID(AD5271_ID))
 281                                         value = value << 2;
 282
 283                                 return dpot_write_r8d8(dpot,
 284                                         (DPOT_AD5270_1_2_4_RDAC << 2) |
 285                                         (value >> 8), value & 0xFF);
 286                         }
 287                         val = DPOT_SPI_RDAC | (reg & DPOT_RDAC_MASK);
 288                 }
 289         } else if (reg & DPOT_ADDR_EEPROM) {
 290                 val = DPOT_SPI_EEPROM | (reg & DPOT_RDAC_MASK);
 291         } else if (reg & DPOT_ADDR_CMD) {
 292                 switch (reg) {
 293                 case DPOT_DEC_ALL_6DB:
 294                         val = DPOT_SPI_DEC_ALL_6DB;
 295                         break;
 296                 case DPOT_INC_ALL_6DB:
 297                         val = DPOT_SPI_INC_ALL_6DB;
 298                         break;
 299                 case DPOT_DEC_ALL:
 300                         val = DPOT_SPI_DEC_ALL;
 301                         break;
 302                 case DPOT_INC_ALL:
 303                         val = DPOT_SPI_INC_ALL;
 304                         break;
 305                 }
 306         } else if (reg & DPOT_ADDR_OTP) {
 307                 if (dpot->uid == DPOT_UID(AD5291_ID) ||
 308                         dpot->uid == DPOT_UID(AD5292_ID)) {
 309                         return dpot_write_r8d8(dpot,
 310                                 DPOT_AD5291_STORE_XTPM << 2, 0);
 311                 } else if (dpot->uid == DPOT_UID(AD5270_ID) ||
 312                         dpot->uid == DPOT_UID(AD5271_ID)) {
 313                         return dpot_write_r8d8(dpot,
 314                                 DPOT_AD5270_1_2_4_STORE_XTPM << 2, 0);
 315                 }
 316         } else
 317                 BUG();
 318
 319         if (dpot->feat & F_SPI_16BIT)
 320                 return dpot_write_r8d8(dpot, val, value);
 321         else if (dpot->feat & F_SPI_24BIT)
 322                 return dpot_write_r8d16(dpot, val, value);
 323
 324         return -EFAULT;
 325 }
 326
 327 static s32 dpot_write_i2c(struct dpot_data *dpot, u8 reg, u16 value)
 328 {
 329         /* Only write the instruction byte for certain commands */
 330         unsigned tmp = 0, ctrl = 0;
 331
 332         switch (dpot->uid) {
 333         case DPOT_UID(AD5246_ID):
 334         case DPOT_UID(AD5247_ID):
 335                 return dpot_write_d8(dpot, value);
 336                 break;
 337
 338         case DPOT_UID(AD5245_ID):
 339         case DPOT_UID(AD5241_ID):
 340         case DPOT_UID(AD5242_ID):
 341         case DPOT_UID(AD5243_ID):
 342         case DPOT_UID(AD5248_ID):
 343         case DPOT_UID(AD5280_ID):
 344         case DPOT_UID(AD5282_ID):
 345                 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
 346                         0 : DPOT_AD5282_RDAC_AB;
 347                 return dpot_write_r8d8(dpot, ctrl, value);
 348                 break;
 349         case DPOT_UID(AD5171_ID):
 350         case DPOT_UID(AD5273_ID):
 351                 if (reg & DPOT_ADDR_OTP) {
 352                         tmp = dpot_read_d8(dpot);
 353                         if (tmp >> 6) /* Ready to Program? */
 354                                 return -EFAULT;
 355                         ctrl = DPOT_AD5273_FUSE;
 356                 }
 357                 return dpot_write_r8d8(dpot, ctrl, value);
 358                 break;
 359         case DPOT_UID(AD5172_ID):
 360         case DPOT_UID(AD5173_ID):
 361                 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
 362                         0 : DPOT_AD5172_3_A0;
 363                 if (reg & DPOT_ADDR_OTP) {
 364                         tmp = dpot_read_r8d16(dpot, ctrl);
 365                         if (tmp >> 14) /* Ready to Program? */
 366                                 return -EFAULT;
 367                         ctrl |= DPOT_AD5170_2_3_FUSE;
 368                 }
 369                 return dpot_write_r8d8(dpot, ctrl, value);
 370                 break;
 371         case DPOT_UID(AD5170_ID):
 372                 if (reg & DPOT_ADDR_OTP) {
 373                         tmp = dpot_read_r8d16(dpot, tmp);
 374                         if (tmp >> 14) /* Ready to Program? */
 375                                 return -EFAULT;
 376                         ctrl = DPOT_AD5170_2_3_FUSE;
 377                 }
 378                 return dpot_write_r8d8(dpot, ctrl, value);
 379                 break;
 380         case DPOT_UID(AD5272_ID):
 381         case DPOT_UID(AD5274_ID):
 382                 dpot_write_r8d8(dpot, DPOT_AD5270_1_2_4_CTRLREG << 2,
 383                                 DPOT_AD5270_1_2_4_UNLOCK_CMD);
 384
 385                 if (reg & DPOT_ADDR_OTP)
 386                         return dpot_write_r8d8(dpot,
 387                                         DPOT_AD5270_1_2_4_STORE_XTPM << 2, 0);
 388
 389                 if (dpot->uid == DPOT_UID(AD5274_ID))
 390                         value = value << 2;
 391
 392                 return dpot_write_r8d8(dpot, (DPOT_AD5270_1_2_4_RDAC << 2) |
 393                                        (value >> 8), value & 0xFF);
 394                 break;
 395         default:
 396                 if (reg & DPOT_ADDR_CMD)
 397                         return dpot_write_d8(dpot, reg);
 398
 399                 if (dpot->max_pos > 256)
 400                         return dpot_write_r8d16(dpot, (reg & 0xF8) |
 401                                                 ((reg & 0x7) << 1), value);
 402                 else
 403                         /* All other registers require instruction + data bytes */
 404                         return dpot_write_r8d8(dpot, reg, value);
 405         }
 406 }
 407
 408 static s32 dpot_write(struct dpot_data *dpot, u8 reg, u16 value)
 409 {
 410         if (dpot->feat & F_SPI)
 411                 return dpot_write_spi(dpot, reg, value);
 412         else
 413                 return dpot_write_i2c(dpot, reg, value);
 414 }
 415
 416 /* sysfs functions */
 417
 418 static ssize_t sysfs_show_reg(struct device *dev,
 419                               struct device_attribute *attr,
 420                               char *buf, u32 reg)
 421 {
 422         struct dpot_data *data = dev_get_drvdata(dev);
 423         s32 value;
 424
 425         if (reg & DPOT_ADDR_OTP_EN)
 426                 return sprintf(buf, "%s\n",
 427                         test_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask) ?
 428                         "enabled" : "disabled");
 429
 430
 431         mutex_lock(&data->update_lock);
 432         value = dpot_read(data, reg);
 433         mutex_unlock(&data->update_lock);
 434
 435         if (value < 0)
 436                 return -EINVAL;
 437         /*
 438          * Let someone else deal with converting this ...
 439          * the tolerance is a two-byte value where the MSB
 440          * is a sign + integer value, and the LSB is a
 441          * decimal value.  See page 18 of the AD5258
 442          * datasheet (Rev. A) for more details.
 443          */
 444
 445         if (reg & DPOT_REG_TOL)
 446                 return sprintf(buf, "0x%04x\n", value & 0xFFFF);
 447         else
 448                 return sprintf(buf, "%u\n", value & data->rdac_mask);
 449 }
 450
 451 static ssize_t sysfs_set_reg(struct device *dev,
 452                              struct device_attribute *attr,
 453                              const char *buf, size_t count, u32 reg)
 454 {
 455         struct dpot_data *data = dev_get_drvdata(dev);
 456         unsigned long value;
 457         int err;
 458
 459         if (reg & DPOT_ADDR_OTP_EN) {
 460                 if (!strncmp(buf, "enabled", sizeof("enabled")))
 461                         set_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask);
 462                 else
 463                         clear_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask);
 464
 465                 return count;
 466         }
 467
 468         if ((reg & DPOT_ADDR_OTP) &&
 469                 !test_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask))
 470                 return -EPERM;
 471
 472         err = kstrtoul(buf, 10, &value);
 473         if (err)
 474                 return err;
 475
 476         if (value > data->rdac_mask)
 477                 value = data->rdac_mask;
 478
 479         mutex_lock(&data->update_lock);
 480         dpot_write(data, reg, value);
 481         if (reg & DPOT_ADDR_EEPROM)
 482                 msleep(26);     /* Sleep while the EEPROM updates */
 483         else if (reg & DPOT_ADDR_OTP)
 484                 msleep(400);    /* Sleep while the OTP updates */
 485         mutex_unlock(&data->update_lock);
 486
 487         return count;
 488 }
 489
 490 static ssize_t sysfs_do_cmd(struct device *dev,
 491                             struct device_attribute *attr,
 492                             const char *buf, size_t count, u32 reg)
 493 {
 494         struct dpot_data *data = dev_get_drvdata(dev);
 495
 496         mutex_lock(&data->update_lock);
 497         dpot_write(data, reg, 0);
 498         mutex_unlock(&data->update_lock);
 499
 500         return count;
 501 }
 502
 503 /* ------------------------------------------------------------------------- */
 504
 505 #define DPOT_DEVICE_SHOW(_name, _reg) static ssize_t \
 506 show_##_name(struct device *dev, \
 507                           struct device_attribute *attr, char *buf) \
 508 { \
 509         return sysfs_show_reg(dev, attr, buf, _reg); \
 510 }
 511
 512 #define DPOT_DEVICE_SET(_name, _reg) static ssize_t \
 513 set_##_name(struct device *dev, \
 514                          struct device_attribute *attr, \
 515                          const char *buf, size_t count) \
 516 { \
 517         return sysfs_set_reg(dev, attr, buf, count, _reg); \
 518 }
 519
 520 #define DPOT_DEVICE_SHOW_SET(name, reg) \
 521 DPOT_DEVICE_SHOW(name, reg) \
 522 DPOT_DEVICE_SET(name, reg) \
 523 static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, show_##name, set_##name);
 524
 525 #define DPOT_DEVICE_SHOW_ONLY(name, reg) \
 526 DPOT_DEVICE_SHOW(name, reg) \
 527 static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, show_##name, NULL);
 528
 529 DPOT_DEVICE_SHOW_SET(rdac0, DPOT_ADDR_RDAC | DPOT_RDAC0);
 530 DPOT_DEVICE_SHOW_SET(eeprom0, DPOT_ADDR_EEPROM | DPOT_RDAC0);
 531 DPOT_DEVICE_SHOW_ONLY(tolerance0, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC0);
 532 DPOT_DEVICE_SHOW_SET(otp0, DPOT_ADDR_OTP | DPOT_RDAC0);
 533 DPOT_DEVICE_SHOW_SET(otp0en, DPOT_ADDR_OTP_EN | DPOT_RDAC0);
 534
 535 DPOT_DEVICE_SHOW_SET(rdac1, DPOT_ADDR_RDAC | DPOT_RDAC1);
 536 DPOT_DEVICE_SHOW_SET(eeprom1, DPOT_ADDR_EEPROM | DPOT_RDAC1);
 537 DPOT_DEVICE_SHOW_ONLY(tolerance1, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC1);
 538 DPOT_DEVICE_SHOW_SET(otp1, DPOT_ADDR_OTP | DPOT_RDAC1);
 539 DPOT_DEVICE_SHOW_SET(otp1en, DPOT_ADDR_OTP_EN | DPOT_RDAC1);
 540
 541 DPOT_DEVICE_SHOW_SET(rdac2, DPOT_ADDR_RDAC | DPOT_RDAC2);
 542 DPOT_DEVICE_SHOW_SET(eeprom2, DPOT_ADDR_EEPROM | DPOT_RDAC2);
 543 DPOT_DEVICE_SHOW_ONLY(tolerance2, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC2);
 544 DPOT_DEVICE_SHOW_SET(otp2, DPOT_ADDR_OTP | DPOT_RDAC2);
 545 DPOT_DEVICE_SHOW_SET(otp2en, DPOT_ADDR_OTP_EN | DPOT_RDAC2);
 546
 547 DPOT_DEVICE_SHOW_SET(rdac3, DPOT_ADDR_RDAC | DPOT_RDAC3);
 548 DPOT_DEVICE_SHOW_SET(eeprom3, DPOT_ADDR_EEPROM | DPOT_RDAC3);
 549 DPOT_DEVICE_SHOW_ONLY(tolerance3, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC3);
 550 DPOT_DEVICE_SHOW_SET(otp3, DPOT_ADDR_OTP | DPOT_RDAC3);
 551 DPOT_DEVICE_SHOW_SET(otp3en, DPOT_ADDR_OTP_EN | DPOT_RDAC3);
 552
 553 DPOT_DEVICE_SHOW_SET(rdac4, DPOT_ADDR_RDAC | DPOT_RDAC4);
 554 DPOT_DEVICE_SHOW_SET(eeprom4, DPOT_ADDR_EEPROM | DPOT_RDAC4);
 555 DPOT_DEVICE_SHOW_ONLY(tolerance4, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC4);
 556 DPOT_DEVICE_SHOW_SET(otp4, DPOT_ADDR_OTP | DPOT_RDAC4);
 557 DPOT_DEVICE_SHOW_SET(otp4en, DPOT_ADDR_OTP_EN | DPOT_RDAC4);
 558
 559 DPOT_DEVICE_SHOW_SET(rdac5, DPOT_ADDR_RDAC | DPOT_RDAC5);
 560 DPOT_DEVICE_SHOW_SET(eeprom5, DPOT_ADDR_EEPROM | DPOT_RDAC5);
 561 DPOT_DEVICE_SHOW_ONLY(tolerance5, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC5);
 562 DPOT_DEVICE_SHOW_SET(otp5, DPOT_ADDR_OTP | DPOT_RDAC5);
 563 DPOT_DEVICE_SHOW_SET(otp5en, DPOT_ADDR_OTP_EN | DPOT_RDAC5);
 564
 565 static const struct attribute *dpot_attrib_wipers[] = {
 566         &dev_attr_rdac0.attr,
 567         &dev_attr_rdac1.attr,
 568         &dev_attr_rdac2.attr,
 569         &dev_attr_rdac3.attr,
 570         &dev_attr_rdac4.attr,
 571         &dev_attr_rdac5.attr,
 572         NULL
 573 };
 574
 575 static const struct attribute *dpot_attrib_eeprom[] = {
 576         &dev_attr_eeprom0.attr,
 577         &dev_attr_eeprom1.attr,
 578         &dev_attr_eeprom2.attr,
 579         &dev_attr_eeprom3.attr,
 580         &dev_attr_eeprom4.attr,
 581         &dev_attr_eeprom5.attr,
 582         NULL
 583 };
 584
 585 static const struct attribute *dpot_attrib_otp[] = {
 586         &dev_attr_otp0.attr,
 587         &dev_attr_otp1.attr,
 588         &dev_attr_otp2.attr,
 589         &dev_attr_otp3.attr,
 590         &dev_attr_otp4.attr,
 591         &dev_attr_otp5.attr,
 592         NULL
 593 };
 594
 595 static const struct attribute *dpot_attrib_otp_en[] = {
 596         &dev_attr_otp0en.attr,
 597         &dev_attr_otp1en.attr,
 598         &dev_attr_otp2en.attr,
 599         &dev_attr_otp3en.attr,
 600         &dev_attr_otp4en.attr,
 601         &dev_attr_otp5en.attr,
 602         NULL
 603 };
 604
 605 static const struct attribute *dpot_attrib_tolerance[] = {
 606         &dev_attr_tolerance0.attr,
 607         &dev_attr_tolerance1.attr,
 608         &dev_attr_tolerance2.attr,
 609         &dev_attr_tolerance3.attr,
 610         &dev_attr_tolerance4.attr,
 611         &dev_attr_tolerance5.attr,
 612         NULL
 613 };
 614
 615 /* ------------------------------------------------------------------------- */
 616
 617 #define DPOT_DEVICE_DO_CMD(_name, _cmd) static ssize_t \
 618 set_##_name(struct device *dev, \
 619                          struct device_attribute *attr, \
 620                          const char *buf, size_t count) \
 621 { \
 622         return sysfs_do_cmd(dev, attr, buf, count, _cmd); \
 623 } \
 624 static DEVICE_ATTR(_name, S_IWUSR | S_IRUGO, NULL, set_##_name);
 625
 626 DPOT_DEVICE_DO_CMD(inc_all, DPOT_INC_ALL);
 627 DPOT_DEVICE_DO_CMD(dec_all, DPOT_DEC_ALL);
 628 DPOT_DEVICE_DO_CMD(inc_all_6db, DPOT_INC_ALL_6DB);
 629 DPOT_DEVICE_DO_CMD(dec_all_6db, DPOT_DEC_ALL_6DB);
 630
 631 static struct attribute *ad525x_attributes_commands[] = {
 632         &dev_attr_inc_all.attr,
 633         &dev_attr_dec_all.attr,
 634         &dev_attr_inc_all_6db.attr,
 635         &dev_attr_dec_all_6db.attr,
 636         NULL
 637 };
 638
 639 static const struct attribute_group ad525x_group_commands = {
 640         .attrs = ad525x_attributes_commands,
 641 };
 642
 643 static int ad_dpot_add_files(struct device *dev,
 644                 unsigned features, unsigned rdac)
 645 {
 646         int err = sysfs_create_file(&dev->kobj,
 647                 dpot_attrib_wipers[rdac]);
 648         if (features & F_CMD_EEP)
 649                 err |= sysfs_create_file(&dev->kobj,
 650                         dpot_attrib_eeprom[rdac]);
 651         if (features & F_CMD_TOL)
 652                 err |= sysfs_create_file(&dev->kobj,
 653                         dpot_attrib_tolerance[rdac]);
 654         if (features & F_CMD_OTP) {
 655                 err |= sysfs_create_file(&dev->kobj,
 656                         dpot_attrib_otp_en[rdac]);
 657                 err |= sysfs_create_file(&dev->kobj,
 658                         dpot_attrib_otp[rdac]);
 659         }
 660
 661         if (err)
 662                 dev_err(dev, "failed to register sysfs hooks for RDAC%d\n",
 663                         rdac);
 664
 665         return err;
 666 }
 667
 668 static inline void ad_dpot_remove_files(struct device *dev,
 669                 unsigned features, unsigned rdac)
 670 {
 671         sysfs_remove_file(&dev->kobj,
 672                 dpot_attrib_wipers[rdac]);
 673         if (features & F_CMD_EEP)
 674                 sysfs_remove_file(&dev->kobj,
 675                         dpot_attrib_eeprom[rdac]);
 676         if (features & F_CMD_TOL)
 677                 sysfs_remove_file(&dev->kobj,
 678                         dpot_attrib_tolerance[rdac]);
 679         if (features & F_CMD_OTP) {
 680                 sysfs_remove_file(&dev->kobj,
 681                         dpot_attrib_otp_en[rdac]);
 682                 sysfs_remove_file(&dev->kobj,
 683                         dpot_attrib_otp[rdac]);
 684         }
 685 }
 686
 687 int ad_dpot_probe(struct device *dev,
 688                 struct ad_dpot_bus_data *bdata, unsigned long devid,
 689                             const char *name)
 690 {
 691
 692         struct dpot_data *data;
 693         int i, err = 0;
 694
 695         data = kzalloc(sizeof(struct dpot_data), GFP_KERNEL);
 696         if (!data) {
 697                 err = -ENOMEM;
 698                 goto exit;
 699         }
 700
 701         dev_set_drvdata(dev, data);
 702         mutex_init(&data->update_lock);
 703
 704         data->bdata = *bdata;
 705         data->devid = devid;
 706
 707         data->max_pos = 1 << DPOT_MAX_POS(devid);
 708         data->rdac_mask = data->max_pos - 1;
 709         data->feat = DPOT_FEAT(devid);
 710         data->uid = DPOT_UID(devid);
 711         data->wipers = DPOT_WIPERS(devid);
 712
 713         for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
 714                 if (data->wipers & (1 << i)) {
 715                         err = ad_dpot_add_files(dev, data->feat, i);
 716                         if (err)
 717                                 goto exit_remove_files;
 718                         /* power-up midscale */
 719                         if (data->feat & F_RDACS_WONLY)
 720                                 data->rdac_cache[i] = data->max_pos / 2;
 721                 }
 722
 723         if (data->feat & F_CMD_INC)
 724                 err = sysfs_create_group(&dev->kobj, &ad525x_group_commands);
 725
 726         if (err) {
 727                 dev_err(dev, "failed to register sysfs hooks\n");
 728                 goto exit_free;
 729         }
 730
 731         dev_info(dev, "%s %d-Position Digital Potentiometer registered\n",
 732                  name, data->max_pos);
 733
 734         return 0;
 735
 736 exit_remove_files:
 737         for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
 738                 if (data->wipers & (1 << i))
 739                         ad_dpot_remove_files(dev, data->feat, i);
 740
 741 exit_free:
 742         kfree(data);
 743         dev_set_drvdata(dev, NULL);
 744 exit:
 745         dev_err(dev, "failed to create client for %s ID 0x%lX\n",
 746                 name, devid);
 747         return err;
 748 }
 749 EXPORT_SYMBOL(ad_dpot_probe);
 750
 751 int ad_dpot_remove(struct device *dev)
 752 {
 753         struct dpot_data *data = dev_get_drvdata(dev);
 754         int i;
 755
 756         for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
 757                 if (data->wipers & (1 << i))
 758                         ad_dpot_remove_files(dev, data->feat, i);
 759
 760         kfree(data);
 761
 762         return 0;
 763 }
 764 EXPORT_SYMBOL(ad_dpot_remove);
 765
 766
 767 MODULE_AUTHOR("Chris Verges <chrisv@cyberswitching.com>, "
 768               "Michael Hennerich <hennerich@blackfin.uclinux.org>");
 769 MODULE_DESCRIPTION("Digital potentiometer driver");
 770 MODULE_LICENSE("GPL");