kernel/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
 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
 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         case DPOT_UID(AD5171_ID):
 349         case DPOT_UID(AD5273_ID):
 350                 if (reg & DPOT_ADDR_OTP) {
 351                         tmp = dpot_read_d8(dpot);
 352                         if (tmp >> 6) /* Ready to Program? */
 353                                 return -EFAULT;
 354                         ctrl = DPOT_AD5273_FUSE;
 355                 }
 356                 return dpot_write_r8d8(dpot, ctrl, value);
 357         case DPOT_UID(AD5172_ID):
 358         case DPOT_UID(AD5173_ID):
 359                 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
 360                         0 : DPOT_AD5172_3_A0;
 361                 if (reg & DPOT_ADDR_OTP) {
 362                         tmp = dpot_read_r8d16(dpot, ctrl);
 363                         if (tmp >> 14) /* Ready to Program? */
 364                                 return -EFAULT;
 365                         ctrl |= DPOT_AD5170_2_3_FUSE;
 366                 }
 367                 return dpot_write_r8d8(dpot, ctrl, value);
 368         case DPOT_UID(AD5170_ID):
 369                 if (reg & DPOT_ADDR_OTP) {
 370                         tmp = dpot_read_r8d16(dpot, tmp);
 371                         if (tmp >> 14) /* Ready to Program? */
 372                                 return -EFAULT;
 373                         ctrl = DPOT_AD5170_2_3_FUSE;
 374                 }
 375                 return dpot_write_r8d8(dpot, ctrl, value);
 376         case DPOT_UID(AD5272_ID):
 377         case DPOT_UID(AD5274_ID):
 378                 dpot_write_r8d8(dpot, DPOT_AD5270_1_2_4_CTRLREG << 2,
 379                                 DPOT_AD5270_1_2_4_UNLOCK_CMD);
 380
 381                 if (reg & DPOT_ADDR_OTP)
 382                         return dpot_write_r8d8(dpot,
 383                                         DPOT_AD5270_1_2_4_STORE_XTPM << 2, 0);
 384
 385                 if (dpot->uid == DPOT_UID(AD5274_ID))
 386                         value = value << 2;
 387
 388                 return dpot_write_r8d8(dpot, (DPOT_AD5270_1_2_4_RDAC << 2) |
 389                                        (value >> 8), value & 0xFF);
 390         default:
 391                 if (reg & DPOT_ADDR_CMD)
 392                         return dpot_write_d8(dpot, reg);
 393
 394                 if (dpot->max_pos > 256)
 395                         return dpot_write_r8d16(dpot, (reg & 0xF8) |
 396                                                 ((reg & 0x7) << 1), value);
 397                 else
 398                         /* All other registers require instruction + data bytes */
 399                         return dpot_write_r8d8(dpot, reg, value);
 400         }
 401 }
 402
 403 static s32 dpot_write(struct dpot_data *dpot, u8 reg, u16 value)
 404 {
 405         if (dpot->feat & F_SPI)
 406                 return dpot_write_spi(dpot, reg, value);
 407         else
 408                 return dpot_write_i2c(dpot, reg, value);
 409 }
 410
 411 /* sysfs functions */
 412
 413 static ssize_t sysfs_show_reg(struct device *dev,
 414                               struct device_attribute *attr,
 415                               char *buf, u32 reg)
 416 {
 417         struct dpot_data *data = dev_get_drvdata(dev);
 418         s32 value;
 419
 420         if (reg & DPOT_ADDR_OTP_EN)
 421                 return sprintf(buf, "%s\n",
 422                         test_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask) ?
 423                         "enabled" : "disabled");
 424
 425
 426         mutex_lock(&data->update_lock);
 427         value = dpot_read(data, reg);
 428         mutex_unlock(&data->update_lock);
 429
 430         if (value < 0)
 431                 return -EINVAL;
 432         /*
 433          * Let someone else deal with converting this ...
 434          * the tolerance is a two-byte value where the MSB
 435          * is a sign + integer value, and the LSB is a
 436          * decimal value.  See page 18 of the AD5258
 437          * datasheet (Rev. A) for more details.
 438          */
 439
 440         if (reg & DPOT_REG_TOL)
 441                 return sprintf(buf, "0x%04x\n", value & 0xFFFF);
 442         else
 443                 return sprintf(buf, "%u\n", value & data->rdac_mask);
 444 }
 445
 446 static ssize_t sysfs_set_reg(struct device *dev,
 447                              struct device_attribute *attr,
 448                              const char *buf, size_t count, u32 reg)
 449 {
 450         struct dpot_data *data = dev_get_drvdata(dev);
 451         unsigned long value;
 452         int err;
 453
 454         if (reg & DPOT_ADDR_OTP_EN) {
 455                 if (!strncmp(buf, "enabled", sizeof("enabled")))
 456                         set_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask);
 457                 else
 458                         clear_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask);
 459
 460                 return count;
 461         }
 462
 463         if ((reg & DPOT_ADDR_OTP) &&
 464                 !test_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask))
 465                 return -EPERM;
 466
 467         err = kstrtoul(buf, 10, &value);
 468         if (err)
 469                 return err;
 470
 471         if (value > data->rdac_mask)
 472                 value = data->rdac_mask;
 473
 474         mutex_lock(&data->update_lock);
 475         dpot_write(data, reg, value);
 476         if (reg & DPOT_ADDR_EEPROM)
 477                 msleep(26);     /* Sleep while the EEPROM updates */
 478         else if (reg & DPOT_ADDR_OTP)
 479                 msleep(400);    /* Sleep while the OTP updates */
 480         mutex_unlock(&data->update_lock);
 481
 482         return count;
 483 }
 484
 485 static ssize_t sysfs_do_cmd(struct device *dev,
 486                             struct device_attribute *attr,
 487                             const char *buf, size_t count, u32 reg)
 488 {
 489         struct dpot_data *data = dev_get_drvdata(dev);
 490
 491         mutex_lock(&data->update_lock);
 492         dpot_write(data, reg, 0);
 493         mutex_unlock(&data->update_lock);
 494
 495         return count;
 496 }
 497
 498 /* ------------------------------------------------------------------------- */
 499
 500 #define DPOT_DEVICE_SHOW(_name, _reg) static ssize_t \
 501 show_##_name(struct device *dev, \
 502                           struct device_attribute *attr, char *buf) \
 503 { \
 504         return sysfs_show_reg(dev, attr, buf, _reg); \
 505 }
 506
 507 #define DPOT_DEVICE_SET(_name, _reg) static ssize_t \
 508 set_##_name(struct device *dev, \
 509                          struct device_attribute *attr, \
 510                          const char *buf, size_t count) \
 511 { \
 512         return sysfs_set_reg(dev, attr, buf, count, _reg); \
 513 }
 514
 515 #define DPOT_DEVICE_SHOW_SET(name, reg) \
 516 DPOT_DEVICE_SHOW(name, reg) \
 517 DPOT_DEVICE_SET(name, reg) \
 518 static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, show_##name, set_##name);
 519
 520 #define DPOT_DEVICE_SHOW_ONLY(name, reg) \
 521 DPOT_DEVICE_SHOW(name, reg) \
 522 static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, show_##name, NULL);
 523
 524 DPOT_DEVICE_SHOW_SET(rdac0, DPOT_ADDR_RDAC | DPOT_RDAC0);
 525 DPOT_DEVICE_SHOW_SET(eeprom0, DPOT_ADDR_EEPROM | DPOT_RDAC0);
 526 DPOT_DEVICE_SHOW_ONLY(tolerance0, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC0);
 527 DPOT_DEVICE_SHOW_SET(otp0, DPOT_ADDR_OTP | DPOT_RDAC0);
 528 DPOT_DEVICE_SHOW_SET(otp0en, DPOT_ADDR_OTP_EN | DPOT_RDAC0);
 529
 530 DPOT_DEVICE_SHOW_SET(rdac1, DPOT_ADDR_RDAC | DPOT_RDAC1);
 531 DPOT_DEVICE_SHOW_SET(eeprom1, DPOT_ADDR_EEPROM | DPOT_RDAC1);
 532 DPOT_DEVICE_SHOW_ONLY(tolerance1, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC1);
 533 DPOT_DEVICE_SHOW_SET(otp1, DPOT_ADDR_OTP | DPOT_RDAC1);
 534 DPOT_DEVICE_SHOW_SET(otp1en, DPOT_ADDR_OTP_EN | DPOT_RDAC1);
 535
 536 DPOT_DEVICE_SHOW_SET(rdac2, DPOT_ADDR_RDAC | DPOT_RDAC2);
 537 DPOT_DEVICE_SHOW_SET(eeprom2, DPOT_ADDR_EEPROM | DPOT_RDAC2);
 538 DPOT_DEVICE_SHOW_ONLY(tolerance2, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC2);
 539 DPOT_DEVICE_SHOW_SET(otp2, DPOT_ADDR_OTP | DPOT_RDAC2);
 540 DPOT_DEVICE_SHOW_SET(otp2en, DPOT_ADDR_OTP_EN | DPOT_RDAC2);
 541
 542 DPOT_DEVICE_SHOW_SET(rdac3, DPOT_ADDR_RDAC | DPOT_RDAC3);
 543 DPOT_DEVICE_SHOW_SET(eeprom3, DPOT_ADDR_EEPROM | DPOT_RDAC3);
 544 DPOT_DEVICE_SHOW_ONLY(tolerance3, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC3);
 545 DPOT_DEVICE_SHOW_SET(otp3, DPOT_ADDR_OTP | DPOT_RDAC3);
 546 DPOT_DEVICE_SHOW_SET(otp3en, DPOT_ADDR_OTP_EN | DPOT_RDAC3);
 547
 548 DPOT_DEVICE_SHOW_SET(rdac4, DPOT_ADDR_RDAC | DPOT_RDAC4);
 549 DPOT_DEVICE_SHOW_SET(eeprom4, DPOT_ADDR_EEPROM | DPOT_RDAC4);
 550 DPOT_DEVICE_SHOW_ONLY(tolerance4, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC4);
 551 DPOT_DEVICE_SHOW_SET(otp4, DPOT_ADDR_OTP | DPOT_RDAC4);
 552 DPOT_DEVICE_SHOW_SET(otp4en, DPOT_ADDR_OTP_EN | DPOT_RDAC4);
 553
 554 DPOT_DEVICE_SHOW_SET(rdac5, DPOT_ADDR_RDAC | DPOT_RDAC5);
 555 DPOT_DEVICE_SHOW_SET(eeprom5, DPOT_ADDR_EEPROM | DPOT_RDAC5);
 556 DPOT_DEVICE_SHOW_ONLY(tolerance5, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC5);
 557 DPOT_DEVICE_SHOW_SET(otp5, DPOT_ADDR_OTP | DPOT_RDAC5);
 558 DPOT_DEVICE_SHOW_SET(otp5en, DPOT_ADDR_OTP_EN | DPOT_RDAC5);
 559
 560 static const struct attribute *dpot_attrib_wipers[] = {
 561         &dev_attr_rdac0.attr,
 562         &dev_attr_rdac1.attr,
 563         &dev_attr_rdac2.attr,
 564         &dev_attr_rdac3.attr,
 565         &dev_attr_rdac4.attr,
 566         &dev_attr_rdac5.attr,
 567         NULL
 568 };
 569
 570 static const struct attribute *dpot_attrib_eeprom[] = {
 571         &dev_attr_eeprom0.attr,
 572         &dev_attr_eeprom1.attr,
 573         &dev_attr_eeprom2.attr,
 574         &dev_attr_eeprom3.attr,
 575         &dev_attr_eeprom4.attr,
 576         &dev_attr_eeprom5.attr,
 577         NULL
 578 };
 579
 580 static const struct attribute *dpot_attrib_otp[] = {
 581         &dev_attr_otp0.attr,
 582         &dev_attr_otp1.attr,
 583         &dev_attr_otp2.attr,
 584         &dev_attr_otp3.attr,
 585         &dev_attr_otp4.attr,
 586         &dev_attr_otp5.attr,
 587         NULL
 588 };
 589
 590 static const struct attribute *dpot_attrib_otp_en[] = {
 591         &dev_attr_otp0en.attr,
 592         &dev_attr_otp1en.attr,
 593         &dev_attr_otp2en.attr,
 594         &dev_attr_otp3en.attr,
 595         &dev_attr_otp4en.attr,
 596         &dev_attr_otp5en.attr,
 597         NULL
 598 };
 599
 600 static const struct attribute *dpot_attrib_tolerance[] = {
 601         &dev_attr_tolerance0.attr,
 602         &dev_attr_tolerance1.attr,
 603         &dev_attr_tolerance2.attr,
 604         &dev_attr_tolerance3.attr,
 605         &dev_attr_tolerance4.attr,
 606         &dev_attr_tolerance5.attr,
 607         NULL
 608 };
 609
 610 /* ------------------------------------------------------------------------- */
 611
 612 #define DPOT_DEVICE_DO_CMD(_name, _cmd) static ssize_t \
 613 set_##_name(struct device *dev, \
 614                          struct device_attribute *attr, \
 615                          const char *buf, size_t count) \
 616 { \
 617         return sysfs_do_cmd(dev, attr, buf, count, _cmd); \
 618 } \
 619 static DEVICE_ATTR(_name, S_IWUSR | S_IRUGO, NULL, set_##_name);
 620
 621 DPOT_DEVICE_DO_CMD(inc_all, DPOT_INC_ALL);
 622 DPOT_DEVICE_DO_CMD(dec_all, DPOT_DEC_ALL);
 623 DPOT_DEVICE_DO_CMD(inc_all_6db, DPOT_INC_ALL_6DB);
 624 DPOT_DEVICE_DO_CMD(dec_all_6db, DPOT_DEC_ALL_6DB);
 625
 626 static struct attribute *ad525x_attributes_commands[] = {
 627         &dev_attr_inc_all.attr,
 628         &dev_attr_dec_all.attr,
 629         &dev_attr_inc_all_6db.attr,
 630         &dev_attr_dec_all_6db.attr,
 631         NULL
 632 };
 633
 634 static const struct attribute_group ad525x_group_commands = {
 635         .attrs = ad525x_attributes_commands,
 636 };
 637
 638 static int ad_dpot_add_files(struct device *dev,
 639                 unsigned features, unsigned rdac)
 640 {
 641         int err = sysfs_create_file(&dev->kobj,
 642                 dpot_attrib_wipers[rdac]);
 643         if (features & F_CMD_EEP)
 644                 err |= sysfs_create_file(&dev->kobj,
 645                         dpot_attrib_eeprom[rdac]);
 646         if (features & F_CMD_TOL)
 647                 err |= sysfs_create_file(&dev->kobj,
 648                         dpot_attrib_tolerance[rdac]);
 649         if (features & F_CMD_OTP) {
 650                 err |= sysfs_create_file(&dev->kobj,
 651                         dpot_attrib_otp_en[rdac]);
 652                 err |= sysfs_create_file(&dev->kobj,
 653                         dpot_attrib_otp[rdac]);
 654         }
 655
 656         if (err)
 657                 dev_err(dev, "failed to register sysfs hooks for RDAC%d\n",
 658                         rdac);
 659
 660         return err;
 661 }
 662
 663 static inline void ad_dpot_remove_files(struct device *dev,
 664                 unsigned features, unsigned rdac)
 665 {
 666         sysfs_remove_file(&dev->kobj,
 667                 dpot_attrib_wipers[rdac]);
 668         if (features & F_CMD_EEP)
 669                 sysfs_remove_file(&dev->kobj,
 670                         dpot_attrib_eeprom[rdac]);
 671         if (features & F_CMD_TOL)
 672                 sysfs_remove_file(&dev->kobj,
 673                         dpot_attrib_tolerance[rdac]);
 674         if (features & F_CMD_OTP) {
 675                 sysfs_remove_file(&dev->kobj,
 676                         dpot_attrib_otp_en[rdac]);
 677                 sysfs_remove_file(&dev->kobj,
 678                         dpot_attrib_otp[rdac]);
 679         }
 680 }
 681
 682 int ad_dpot_probe(struct device *dev,
 683                 struct ad_dpot_bus_data *bdata, unsigned long devid,
 684                             const char *name)
 685 {
 686
 687         struct dpot_data *data;
 688         int i, err = 0;
 689
 690         data = kzalloc(sizeof(struct dpot_data), GFP_KERNEL);
 691         if (!data) {
 692                 err = -ENOMEM;
 693                 goto exit;
 694         }
 695
 696         dev_set_drvdata(dev, data);
 697         mutex_init(&data->update_lock);
 698
 699         data->bdata = *bdata;
 700         data->devid = devid;
 701
 702         data->max_pos = 1 << DPOT_MAX_POS(devid);
 703         data->rdac_mask = data->max_pos - 1;
 704         data->feat = DPOT_FEAT(devid);
 705         data->uid = DPOT_UID(devid);
 706         data->wipers = DPOT_WIPERS(devid);
 707
 708         for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
 709                 if (data->wipers & (1 << i)) {
 710                         err = ad_dpot_add_files(dev, data->feat, i);
 711                         if (err)
 712                                 goto exit_remove_files;
 713                         /* power-up midscale */
 714                         if (data->feat & F_RDACS_WONLY)
 715                                 data->rdac_cache[i] = data->max_pos / 2;
 716                 }
 717
 718         if (data->feat & F_CMD_INC)
 719                 err = sysfs_create_group(&dev->kobj, &ad525x_group_commands);
 720
 721         if (err) {
 722                 dev_err(dev, "failed to register sysfs hooks\n");
 723                 goto exit_free;
 724         }
 725
 726         dev_info(dev, "%s %d-Position Digital Potentiometer registered\n",
 727                  name, data->max_pos);
 728
 729         return 0;
 730
 731 exit_remove_files:
 732         for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
 733                 if (data->wipers & (1 << i))
 734                         ad_dpot_remove_files(dev, data->feat, i);
 735
 736 exit_free:
 737         kfree(data);
 738         dev_set_drvdata(dev, NULL);
 739 exit:
 740         dev_err(dev, "failed to create client for %s ID 0x%lX\n",
 741                 name, devid);
 742         return err;
 743 }
 744 EXPORT_SYMBOL(ad_dpot_probe);
 745
 746 int ad_dpot_remove(struct device *dev)
 747 {
 748         struct dpot_data *data = dev_get_drvdata(dev);
 749         int i;
 750
 751         for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
 752                 if (data->wipers & (1 << i))
 753                         ad_dpot_remove_files(dev, data->feat, i);
 754
 755         kfree(data);
 756
 757         return 0;
 758 }
 759 EXPORT_SYMBOL(ad_dpot_remove);
 760
 761
 762 MODULE_AUTHOR("Chris Verges <chrisv@cyberswitching.com>, "
 763               "Michael Hennerich <hennerich@blackfin.uclinux.org>");
 764 MODULE_DESCRIPTION("Digital potentiometer driver");
 765 MODULE_LICENSE("GPL");