1 /* 2 * Hardware monitoring driver for Analog Devices ADM1275 Hot-Swap Controller 3 * and Digital Power Monitor 4 * 5 * Copyright (c) 2011 Ericsson AB. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 */ 17 18 #include <linux/kernel.h> 19 #include <linux/module.h> 20 #include <linux/init.h> 21 #include <linux/err.h> 22 #include <linux/slab.h> 23 #include <linux/i2c.h> 24 #include <linux/bitops.h> 25 #include "pmbus.h" 26 27 enum chips { adm1075, adm1275, adm1276, adm1293, adm1294 }; 28 29 #define ADM1275_MFR_STATUS_IOUT_WARN2 BIT(0) 30 #define ADM1293_MFR_STATUS_VAUX_UV_WARN BIT(5) 31 #define ADM1293_MFR_STATUS_VAUX_OV_WARN BIT(6) 32 33 #define ADM1275_PEAK_IOUT 0xd0 34 #define ADM1275_PEAK_VIN 0xd1 35 #define ADM1275_PEAK_VOUT 0xd2 36 #define ADM1275_PMON_CONFIG 0xd4 37 38 #define ADM1275_VIN_VOUT_SELECT BIT(6) 39 #define ADM1275_VRANGE BIT(5) 40 #define ADM1075_IRANGE_50 BIT(4) 41 #define ADM1075_IRANGE_25 BIT(3) 42 #define ADM1075_IRANGE_MASK (BIT(3) | BIT(4)) 43 44 #define ADM1293_IRANGE_25 0 45 #define ADM1293_IRANGE_50 BIT(6) 46 #define ADM1293_IRANGE_100 BIT(7) 47 #define ADM1293_IRANGE_200 (BIT(6) | BIT(7)) 48 #define ADM1293_IRANGE_MASK (BIT(6) | BIT(7)) 49 50 #define ADM1293_VIN_SEL_012 BIT(2) 51 #define ADM1293_VIN_SEL_074 BIT(3) 52 #define ADM1293_VIN_SEL_210 (BIT(2) | BIT(3)) 53 #define ADM1293_VIN_SEL_MASK (BIT(2) | BIT(3)) 54 55 #define ADM1293_VAUX_EN BIT(1) 56 57 #define ADM1275_IOUT_WARN2_LIMIT 0xd7 58 #define ADM1275_DEVICE_CONFIG 0xd8 59 60 #define ADM1275_IOUT_WARN2_SELECT BIT(4) 61 62 #define ADM1276_PEAK_PIN 0xda 63 #define ADM1075_READ_VAUX 0xdd 64 #define ADM1075_VAUX_OV_WARN_LIMIT 0xde 65 #define ADM1075_VAUX_UV_WARN_LIMIT 0xdf 66 #define ADM1293_IOUT_MIN 0xe3 67 #define ADM1293_PIN_MIN 0xe4 68 #define ADM1075_VAUX_STATUS 0xf6 69 70 #define ADM1075_VAUX_OV_WARN BIT(7) 71 #define ADM1075_VAUX_UV_WARN BIT(6) 72 73 struct adm1275_data { 74 int id; 75 bool have_oc_fault; 76 bool have_uc_fault; 77 bool have_vout; 78 bool have_vaux_status; 79 bool have_mfr_vaux_status; 80 bool have_iout_min; 81 bool have_pin_min; 82 bool have_pin_max; 83 struct pmbus_driver_info info; 84 }; 85 86 #define to_adm1275_data(x) container_of(x, struct adm1275_data, info) 87 88 struct coefficients { 89 s16 m; 90 s16 b; 91 s16 R; 92 }; 93 94 static const struct coefficients adm1075_coefficients[] = { 95 [0] = { 27169, 0, -1 }, /* voltage */ 96 [1] = { 806, 20475, -1 }, /* current, irange25 */ 97 [2] = { 404, 20475, -1 }, /* current, irange50 */ 98 [3] = { 0, -1, 8549 }, /* power, irange25 */ 99 [4] = { 0, -1, 4279 }, /* power, irange50 */ 100 }; 101 102 static const struct coefficients adm1275_coefficients[] = { 103 [0] = { 19199, 0, -2 }, /* voltage, vrange set */ 104 [1] = { 6720, 0, -1 }, /* voltage, vrange not set */ 105 [2] = { 807, 20475, -1 }, /* current */ 106 }; 107 108 static const struct coefficients adm1276_coefficients[] = { 109 [0] = { 19199, 0, -2 }, /* voltage, vrange set */ 110 [1] = { 6720, 0, -1 }, /* voltage, vrange not set */ 111 [2] = { 807, 20475, -1 }, /* current */ 112 [3] = { 6043, 0, -2 }, /* power, vrange set */ 113 [4] = { 2115, 0, -1 }, /* power, vrange not set */ 114 }; 115 116 static const struct coefficients adm1293_coefficients[] = { 117 [0] = { 3333, -1, 0 }, /* voltage, vrange 1.2V */ 118 [1] = { 5552, -5, -1 }, /* voltage, vrange 7.4V */ 119 [2] = { 19604, -50, -2 }, /* voltage, vrange 21V */ 120 [3] = { 8000, -100, -2 }, /* current, irange25 */ 121 [4] = { 4000, -100, -2 }, /* current, irange50 */ 122 [5] = { 20000, -1000, -3 }, /* current, irange100 */ 123 [6] = { 10000, -1000, -3 }, /* current, irange200 */ 124 [7] = { 10417, 0, -1 }, /* power, 1.2V, irange25 */ 125 [8] = { 5208, 0, -1 }, /* power, 1.2V, irange50 */ 126 [9] = { 26042, 0, -2 }, /* power, 1.2V, irange100 */ 127 [10] = { 13021, 0, -2 }, /* power, 1.2V, irange200 */ 128 [11] = { 17351, 0, -2 }, /* power, 7.4V, irange25 */ 129 [12] = { 8676, 0, -2 }, /* power, 7.4V, irange50 */ 130 [13] = { 4338, 0, -2 }, /* power, 7.4V, irange100 */ 131 [14] = { 21689, 0, -3 }, /* power, 7.4V, irange200 */ 132 [15] = { 6126, 0, -2 }, /* power, 21V, irange25 */ 133 [16] = { 30631, 0, -3 }, /* power, 21V, irange50 */ 134 [17] = { 15316, 0, -3 }, /* power, 21V, irange100 */ 135 [18] = { 7658, 0, -3 }, /* power, 21V, irange200 */ 136 }; 137 138 static int adm1275_read_word_data(struct i2c_client *client, int page, int reg) 139 { 140 const struct pmbus_driver_info *info = pmbus_get_driver_info(client); 141 const struct adm1275_data *data = to_adm1275_data(info); 142 int ret = 0; 143 144 if (page) 145 return -ENXIO; 146 147 switch (reg) { 148 case PMBUS_IOUT_UC_FAULT_LIMIT: 149 if (!data->have_uc_fault) 150 return -ENXIO; 151 ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT); 152 break; 153 case PMBUS_IOUT_OC_FAULT_LIMIT: 154 if (!data->have_oc_fault) 155 return -ENXIO; 156 ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT); 157 break; 158 case PMBUS_VOUT_OV_WARN_LIMIT: 159 if (data->have_vout) 160 return -ENODATA; 161 ret = pmbus_read_word_data(client, 0, 162 ADM1075_VAUX_OV_WARN_LIMIT); 163 break; 164 case PMBUS_VOUT_UV_WARN_LIMIT: 165 if (data->have_vout) 166 return -ENODATA; 167 ret = pmbus_read_word_data(client, 0, 168 ADM1075_VAUX_UV_WARN_LIMIT); 169 break; 170 case PMBUS_READ_VOUT: 171 if (data->have_vout) 172 return -ENODATA; 173 ret = pmbus_read_word_data(client, 0, ADM1075_READ_VAUX); 174 break; 175 case PMBUS_VIRT_READ_IOUT_MIN: 176 if (!data->have_iout_min) 177 return -ENXIO; 178 ret = pmbus_read_word_data(client, 0, ADM1293_IOUT_MIN); 179 break; 180 case PMBUS_VIRT_READ_IOUT_MAX: 181 ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_IOUT); 182 break; 183 case PMBUS_VIRT_READ_VOUT_MAX: 184 ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VOUT); 185 break; 186 case PMBUS_VIRT_READ_VIN_MAX: 187 ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VIN); 188 break; 189 case PMBUS_VIRT_READ_PIN_MIN: 190 if (!data->have_pin_min) 191 return -ENXIO; 192 ret = pmbus_read_word_data(client, 0, ADM1293_PIN_MIN); 193 break; 194 case PMBUS_VIRT_READ_PIN_MAX: 195 if (!data->have_pin_max) 196 return -ENXIO; 197 ret = pmbus_read_word_data(client, 0, ADM1276_PEAK_PIN); 198 break; 199 case PMBUS_VIRT_RESET_IOUT_HISTORY: 200 case PMBUS_VIRT_RESET_VOUT_HISTORY: 201 case PMBUS_VIRT_RESET_VIN_HISTORY: 202 break; 203 case PMBUS_VIRT_RESET_PIN_HISTORY: 204 if (!data->have_pin_max) 205 return -ENXIO; 206 break; 207 default: 208 ret = -ENODATA; 209 break; 210 } 211 return ret; 212 } 213 214 static int adm1275_write_word_data(struct i2c_client *client, int page, int reg, 215 u16 word) 216 { 217 const struct pmbus_driver_info *info = pmbus_get_driver_info(client); 218 const struct adm1275_data *data = to_adm1275_data(info); 219 int ret; 220 221 if (page) 222 return -ENXIO; 223 224 switch (reg) { 225 case PMBUS_IOUT_UC_FAULT_LIMIT: 226 case PMBUS_IOUT_OC_FAULT_LIMIT: 227 ret = pmbus_write_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT, 228 word); 229 break; 230 case PMBUS_VIRT_RESET_IOUT_HISTORY: 231 ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_IOUT, 0); 232 if (!ret && data->have_iout_min) 233 ret = pmbus_write_word_data(client, 0, 234 ADM1293_IOUT_MIN, 0); 235 break; 236 case PMBUS_VIRT_RESET_VOUT_HISTORY: 237 ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VOUT, 0); 238 break; 239 case PMBUS_VIRT_RESET_VIN_HISTORY: 240 ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VIN, 0); 241 break; 242 case PMBUS_VIRT_RESET_PIN_HISTORY: 243 ret = pmbus_write_word_data(client, 0, ADM1276_PEAK_PIN, 0); 244 if (!ret && data->have_pin_min) 245 ret = pmbus_write_word_data(client, 0, 246 ADM1293_PIN_MIN, 0); 247 break; 248 default: 249 ret = -ENODATA; 250 break; 251 } 252 return ret; 253 } 254 255 static int adm1275_read_byte_data(struct i2c_client *client, int page, int reg) 256 { 257 const struct pmbus_driver_info *info = pmbus_get_driver_info(client); 258 const struct adm1275_data *data = to_adm1275_data(info); 259 int mfr_status, ret; 260 261 if (page > 0) 262 return -ENXIO; 263 264 switch (reg) { 265 case PMBUS_STATUS_IOUT: 266 ret = pmbus_read_byte_data(client, page, PMBUS_STATUS_IOUT); 267 if (ret < 0) 268 break; 269 if (!data->have_oc_fault && !data->have_uc_fault) 270 break; 271 mfr_status = pmbus_read_byte_data(client, page, 272 PMBUS_STATUS_MFR_SPECIFIC); 273 if (mfr_status < 0) 274 return mfr_status; 275 if (mfr_status & ADM1275_MFR_STATUS_IOUT_WARN2) { 276 ret |= data->have_oc_fault ? 277 PB_IOUT_OC_FAULT : PB_IOUT_UC_FAULT; 278 } 279 break; 280 case PMBUS_STATUS_VOUT: 281 if (data->have_vout) 282 return -ENODATA; 283 ret = 0; 284 if (data->have_vaux_status) { 285 mfr_status = pmbus_read_byte_data(client, 0, 286 ADM1075_VAUX_STATUS); 287 if (mfr_status < 0) 288 return mfr_status; 289 if (mfr_status & ADM1075_VAUX_OV_WARN) 290 ret |= PB_VOLTAGE_OV_WARNING; 291 if (mfr_status & ADM1075_VAUX_UV_WARN) 292 ret |= PB_VOLTAGE_UV_WARNING; 293 } else if (data->have_mfr_vaux_status) { 294 mfr_status = pmbus_read_byte_data(client, page, 295 PMBUS_STATUS_MFR_SPECIFIC); 296 if (mfr_status < 0) 297 return mfr_status; 298 if (mfr_status & ADM1293_MFR_STATUS_VAUX_OV_WARN) 299 ret |= PB_VOLTAGE_OV_WARNING; 300 if (mfr_status & ADM1293_MFR_STATUS_VAUX_UV_WARN) 301 ret |= PB_VOLTAGE_UV_WARNING; 302 } 303 break; 304 default: 305 ret = -ENODATA; 306 break; 307 } 308 return ret; 309 } 310 311 static const struct i2c_device_id adm1275_id[] = { 312 { "adm1075", adm1075 }, 313 { "adm1275", adm1275 }, 314 { "adm1276", adm1276 }, 315 { "adm1293", adm1293 }, 316 { "adm1294", adm1294 }, 317 { } 318 }; 319 MODULE_DEVICE_TABLE(i2c, adm1275_id); 320 321 static int adm1275_probe(struct i2c_client *client, 322 const struct i2c_device_id *id) 323 { 324 u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1]; 325 int config, device_config; 326 int ret; 327 struct pmbus_driver_info *info; 328 struct adm1275_data *data; 329 const struct i2c_device_id *mid; 330 const struct coefficients *coefficients; 331 int vindex = -1, voindex = -1, cindex = -1, pindex = -1; 332 333 if (!i2c_check_functionality(client->adapter, 334 I2C_FUNC_SMBUS_READ_BYTE_DATA 335 | I2C_FUNC_SMBUS_BLOCK_DATA)) 336 return -ENODEV; 337 338 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, block_buffer); 339 if (ret < 0) { 340 dev_err(&client->dev, "Failed to read Manufacturer ID\n"); 341 return ret; 342 } 343 if (ret != 3 || strncmp(block_buffer, "ADI", 3)) { 344 dev_err(&client->dev, "Unsupported Manufacturer ID\n"); 345 return -ENODEV; 346 } 347 348 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, block_buffer); 349 if (ret < 0) { 350 dev_err(&client->dev, "Failed to read Manufacturer Model\n"); 351 return ret; 352 } 353 for (mid = adm1275_id; mid->name[0]; mid++) { 354 if (!strncasecmp(mid->name, block_buffer, strlen(mid->name))) 355 break; 356 } 357 if (!mid->name[0]) { 358 dev_err(&client->dev, "Unsupported device\n"); 359 return -ENODEV; 360 } 361 362 if (id->driver_data != mid->driver_data) 363 dev_notice(&client->dev, 364 "Device mismatch: Configured %s, detected %s\n", 365 id->name, mid->name); 366 367 config = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG); 368 if (config < 0) 369 return config; 370 371 device_config = i2c_smbus_read_byte_data(client, ADM1275_DEVICE_CONFIG); 372 if (device_config < 0) 373 return device_config; 374 375 data = devm_kzalloc(&client->dev, sizeof(struct adm1275_data), 376 GFP_KERNEL); 377 if (!data) 378 return -ENOMEM; 379 380 data->id = mid->driver_data; 381 382 info = &data->info; 383 384 info->pages = 1; 385 info->format[PSC_VOLTAGE_IN] = direct; 386 info->format[PSC_VOLTAGE_OUT] = direct; 387 info->format[PSC_CURRENT_OUT] = direct; 388 info->format[PSC_POWER] = direct; 389 info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT; 390 391 info->read_word_data = adm1275_read_word_data; 392 info->read_byte_data = adm1275_read_byte_data; 393 info->write_word_data = adm1275_write_word_data; 394 395 switch (data->id) { 396 case adm1075: 397 if (device_config & ADM1275_IOUT_WARN2_SELECT) 398 data->have_oc_fault = true; 399 else 400 data->have_uc_fault = true; 401 data->have_pin_max = true; 402 data->have_vaux_status = true; 403 404 coefficients = adm1075_coefficients; 405 vindex = 0; 406 switch (config & ADM1075_IRANGE_MASK) { 407 case ADM1075_IRANGE_25: 408 cindex = 1; 409 pindex = 3; 410 break; 411 case ADM1075_IRANGE_50: 412 cindex = 2; 413 pindex = 4; 414 break; 415 default: 416 dev_err(&client->dev, "Invalid input current range"); 417 break; 418 } 419 420 info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_PIN 421 | PMBUS_HAVE_STATUS_INPUT; 422 if (config & ADM1275_VIN_VOUT_SELECT) 423 info->func[0] |= 424 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT; 425 break; 426 case adm1275: 427 if (device_config & ADM1275_IOUT_WARN2_SELECT) 428 data->have_oc_fault = true; 429 else 430 data->have_uc_fault = true; 431 data->have_vout = true; 432 433 coefficients = adm1275_coefficients; 434 vindex = (config & ADM1275_VRANGE) ? 0 : 1; 435 cindex = 2; 436 437 if (config & ADM1275_VIN_VOUT_SELECT) 438 info->func[0] |= 439 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT; 440 else 441 info->func[0] |= 442 PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT; 443 break; 444 case adm1276: 445 if (device_config & ADM1275_IOUT_WARN2_SELECT) 446 data->have_oc_fault = true; 447 else 448 data->have_uc_fault = true; 449 data->have_vout = true; 450 data->have_pin_max = true; 451 452 coefficients = adm1276_coefficients; 453 vindex = (config & ADM1275_VRANGE) ? 0 : 1; 454 cindex = 2; 455 pindex = (config & ADM1275_VRANGE) ? 3 : 4; 456 457 info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_PIN 458 | PMBUS_HAVE_STATUS_INPUT; 459 if (config & ADM1275_VIN_VOUT_SELECT) 460 info->func[0] |= 461 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT; 462 break; 463 case adm1293: 464 case adm1294: 465 data->have_iout_min = true; 466 data->have_pin_min = true; 467 data->have_pin_max = true; 468 data->have_mfr_vaux_status = true; 469 470 coefficients = adm1293_coefficients; 471 472 voindex = 0; 473 switch (config & ADM1293_VIN_SEL_MASK) { 474 case ADM1293_VIN_SEL_012: /* 1.2V */ 475 vindex = 0; 476 break; 477 case ADM1293_VIN_SEL_074: /* 7.4V */ 478 vindex = 1; 479 break; 480 case ADM1293_VIN_SEL_210: /* 21V */ 481 vindex = 2; 482 break; 483 default: /* disabled */ 484 break; 485 } 486 487 switch (config & ADM1293_IRANGE_MASK) { 488 case ADM1293_IRANGE_25: 489 cindex = 3; 490 break; 491 case ADM1293_IRANGE_50: 492 cindex = 4; 493 break; 494 case ADM1293_IRANGE_100: 495 cindex = 5; 496 break; 497 case ADM1293_IRANGE_200: 498 cindex = 6; 499 break; 500 } 501 502 if (vindex >= 0) 503 pindex = 7 + vindex * 4 + (cindex - 3); 504 505 if (config & ADM1293_VAUX_EN) 506 info->func[0] |= 507 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT; 508 509 info->func[0] |= PMBUS_HAVE_PIN | 510 PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT; 511 512 break; 513 default: 514 dev_err(&client->dev, "Unsupported device\n"); 515 return -ENODEV; 516 } 517 518 if (voindex < 0) 519 voindex = vindex; 520 if (vindex >= 0) { 521 info->m[PSC_VOLTAGE_IN] = coefficients[vindex].m; 522 info->b[PSC_VOLTAGE_IN] = coefficients[vindex].b; 523 info->R[PSC_VOLTAGE_IN] = coefficients[vindex].R; 524 } 525 if (voindex >= 0) { 526 info->m[PSC_VOLTAGE_OUT] = coefficients[voindex].m; 527 info->b[PSC_VOLTAGE_OUT] = coefficients[voindex].b; 528 info->R[PSC_VOLTAGE_OUT] = coefficients[voindex].R; 529 } 530 if (cindex >= 0) { 531 info->m[PSC_CURRENT_OUT] = coefficients[cindex].m; 532 info->b[PSC_CURRENT_OUT] = coefficients[cindex].b; 533 info->R[PSC_CURRENT_OUT] = coefficients[cindex].R; 534 } 535 if (pindex >= 0) { 536 info->m[PSC_POWER] = coefficients[pindex].m; 537 info->b[PSC_POWER] = coefficients[pindex].b; 538 info->R[PSC_POWER] = coefficients[pindex].R; 539 } 540 541 return pmbus_do_probe(client, id, info); 542 } 543 544 static struct i2c_driver adm1275_driver = { 545 .driver = { 546 .name = "adm1275", 547 }, 548 .probe = adm1275_probe, 549 .remove = pmbus_do_remove, 550 .id_table = adm1275_id, 551 }; 552 553 module_i2c_driver(adm1275_driver); 554 555 MODULE_AUTHOR("Guenter Roeck"); 556 MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275 and compatibles"); 557 MODULE_LICENSE("GPL"); 558