1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * ad525x_dpot: Driver for the Analog Devices digital potentiometers 4 * Copyright (c) 2009-2010 Analog Devices, Inc. 5 * Author: Michael Hennerich <michael.hennerich@analog.com> 6 * 7 * DEVID #Wipers #Positions Resistor Options (kOhm) 8 * AD5258 1 64 1, 10, 50, 100 9 * AD5259 1 256 5, 10, 50, 100 10 * AD5251 2 64 1, 10, 50, 100 11 * AD5252 2 256 1, 10, 50, 100 12 * AD5255 3 512 25, 250 13 * AD5253 4 64 1, 10, 50, 100 14 * AD5254 4 256 1, 10, 50, 100 15 * AD5160 1 256 5, 10, 50, 100 16 * AD5161 1 256 5, 10, 50, 100 17 * AD5162 2 256 2.5, 10, 50, 100 18 * AD5165 1 256 100 19 * AD5200 1 256 10, 50 20 * AD5201 1 33 10, 50 21 * AD5203 4 64 10, 100 22 * AD5204 4 256 10, 50, 100 23 * AD5206 6 256 10, 50, 100 24 * AD5207 2 256 10, 50, 100 25 * AD5231 1 1024 10, 50, 100 26 * AD5232 2 256 10, 50, 100 27 * AD5233 4 64 10, 50, 100 28 * AD5235 2 1024 25, 250 29 * AD5260 1 256 20, 50, 200 30 * AD5262 2 256 20, 50, 200 31 * AD5263 4 256 20, 50, 200 32 * AD5290 1 256 10, 50, 100 33 * AD5291 1 256 20, 50, 100 (20-TP) 34 * AD5292 1 1024 20, 50, 100 (20-TP) 35 * AD5293 1 1024 20, 50, 100 36 * AD7376 1 128 10, 50, 100, 1M 37 * AD8400 1 256 1, 10, 50, 100 38 * AD8402 2 256 1, 10, 50, 100 39 * AD8403 4 256 1, 10, 50, 100 40 * ADN2850 3 512 25, 250 41 * AD5241 1 256 10, 100, 1M 42 * AD5246 1 128 5, 10, 50, 100 43 * AD5247 1 128 5, 10, 50, 100 44 * AD5245 1 256 5, 10, 50, 100 45 * AD5243 2 256 2.5, 10, 50, 100 46 * AD5248 2 256 2.5, 10, 50, 100 47 * AD5242 2 256 20, 50, 200 48 * AD5280 1 256 20, 50, 200 49 * AD5282 2 256 20, 50, 200 50 * ADN2860 3 512 25, 250 51 * AD5273 1 64 1, 10, 50, 100 (OTP) 52 * AD5171 1 64 5, 10, 50, 100 (OTP) 53 * AD5170 1 256 2.5, 10, 50, 100 (OTP) 54 * AD5172 2 256 2.5, 10, 50, 100 (OTP) 55 * AD5173 2 256 2.5, 10, 50, 100 (OTP) 56 * AD5270 1 1024 20, 50, 100 (50-TP) 57 * AD5271 1 256 20, 50, 100 (50-TP) 58 * AD5272 1 1024 20, 50, 100 (50-TP) 59 * AD5274 1 256 20, 50, 100 (50-TP) 60 * 61 * See Documentation/misc-devices/ad525x_dpot.rst for more info. 62 * 63 * derived from ad5258.c 64 * Copyright (c) 2009 Cyber Switching, Inc. 65 * Author: Chris Verges <chrisv@cyberswitching.com> 66 * 67 * derived from ad5252.c 68 * Copyright (c) 2006-2011 Michael Hennerich <michael.hennerich@analog.com> 69 */ 70 71 #include <linux/module.h> 72 #include <linux/device.h> 73 #include <linux/kernel.h> 74 #include <linux/delay.h> 75 #include <linux/slab.h> 76 77 #include "ad525x_dpot.h" 78 79 /* 80 * Client data (each client gets its own) 81 */ 82 83 struct dpot_data { 84 struct ad_dpot_bus_data bdata; 85 struct mutex update_lock; 86 unsigned int rdac_mask; 87 unsigned int max_pos; 88 unsigned long devid; 89 unsigned int uid; 90 unsigned int feat; 91 unsigned int wipers; 92 u16 rdac_cache[MAX_RDACS]; 93 DECLARE_BITMAP(otp_en_mask, MAX_RDACS); 94 }; 95 96 static inline int dpot_read_d8(struct dpot_data *dpot) 97 { 98 return dpot->bdata.bops->read_d8(dpot->bdata.client); 99 } 100 101 static inline int dpot_read_r8d8(struct dpot_data *dpot, u8 reg) 102 { 103 return dpot->bdata.bops->read_r8d8(dpot->bdata.client, reg); 104 } 105 106 static inline int dpot_read_r8d16(struct dpot_data *dpot, u8 reg) 107 { 108 return dpot->bdata.bops->read_r8d16(dpot->bdata.client, reg); 109 } 110 111 static inline int dpot_write_d8(struct dpot_data *dpot, u8 val) 112 { 113 return dpot->bdata.bops->write_d8(dpot->bdata.client, val); 114 } 115 116 static inline int dpot_write_r8d8(struct dpot_data *dpot, u8 reg, u16 val) 117 { 118 return dpot->bdata.bops->write_r8d8(dpot->bdata.client, reg, val); 119 } 120 121 static inline int dpot_write_r8d16(struct dpot_data *dpot, u8 reg, u16 val) 122 { 123 return dpot->bdata.bops->write_r8d16(dpot->bdata.client, reg, val); 124 } 125 126 static s32 dpot_read_spi(struct dpot_data *dpot, u8 reg) 127 { 128 unsigned int ctrl = 0; 129 int value; 130 131 if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD))) { 132 133 if (dpot->feat & F_RDACS_WONLY) 134 return dpot->rdac_cache[reg & DPOT_RDAC_MASK]; 135 if (dpot->uid == DPOT_UID(AD5291_ID) || 136 dpot->uid == DPOT_UID(AD5292_ID) || 137 dpot->uid == DPOT_UID(AD5293_ID)) { 138 139 value = dpot_read_r8d8(dpot, 140 DPOT_AD5291_READ_RDAC << 2); 141 142 if (value < 0) 143 return value; 144 145 if (dpot->uid == DPOT_UID(AD5291_ID)) 146 value = value >> 2; 147 148 return value; 149 } else if (dpot->uid == DPOT_UID(AD5270_ID) || 150 dpot->uid == DPOT_UID(AD5271_ID)) { 151 152 value = dpot_read_r8d8(dpot, 153 DPOT_AD5270_1_2_4_READ_RDAC << 2); 154 155 if (value < 0) 156 return value; 157 158 if (dpot->uid == DPOT_UID(AD5271_ID)) 159 value = value >> 2; 160 161 return value; 162 } 163 164 ctrl = DPOT_SPI_READ_RDAC; 165 } else if (reg & DPOT_ADDR_EEPROM) { 166 ctrl = DPOT_SPI_READ_EEPROM; 167 } 168 169 if (dpot->feat & F_SPI_16BIT) 170 return dpot_read_r8d8(dpot, ctrl); 171 else if (dpot->feat & F_SPI_24BIT) 172 return dpot_read_r8d16(dpot, ctrl); 173 174 return -EFAULT; 175 } 176 177 static s32 dpot_read_i2c(struct dpot_data *dpot, u8 reg) 178 { 179 int value; 180 unsigned int ctrl = 0; 181 182 switch (dpot->uid) { 183 case DPOT_UID(AD5246_ID): 184 case DPOT_UID(AD5247_ID): 185 return dpot_read_d8(dpot); 186 case DPOT_UID(AD5245_ID): 187 case DPOT_UID(AD5241_ID): 188 case DPOT_UID(AD5242_ID): 189 case DPOT_UID(AD5243_ID): 190 case DPOT_UID(AD5248_ID): 191 case DPOT_UID(AD5280_ID): 192 case DPOT_UID(AD5282_ID): 193 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ? 194 0 : DPOT_AD5282_RDAC_AB; 195 return dpot_read_r8d8(dpot, ctrl); 196 case DPOT_UID(AD5170_ID): 197 case DPOT_UID(AD5171_ID): 198 case DPOT_UID(AD5273_ID): 199 return dpot_read_d8(dpot); 200 case DPOT_UID(AD5172_ID): 201 case DPOT_UID(AD5173_ID): 202 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ? 203 0 : DPOT_AD5172_3_A0; 204 return dpot_read_r8d8(dpot, ctrl); 205 case DPOT_UID(AD5272_ID): 206 case DPOT_UID(AD5274_ID): 207 dpot_write_r8d8(dpot, 208 (DPOT_AD5270_1_2_4_READ_RDAC << 2), 0); 209 210 value = dpot_read_r8d16(dpot, DPOT_AD5270_1_2_4_RDAC << 2); 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(AD5274_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 int 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 int 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 (sysfs_streq(buf, "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 int features, unsigned int 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 int features, unsigned int 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 <michael.hennerich@analog.com>"); 764 MODULE_DESCRIPTION("Digital potentiometer driver"); 765 MODULE_LICENSE("GPL"); 766