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