1 /* 2 * Hardware monitoring driver for LM25056 / LM25063 / LM25066 / LM5064 / LM5066 3 * 4 * Copyright (c) 2011 Ericsson AB. 5 * Copyright (c) 2013 Guenter Roeck 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 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 */ 21 22 #include <linux/kernel.h> 23 #include <linux/module.h> 24 #include <linux/init.h> 25 #include <linux/err.h> 26 #include <linux/slab.h> 27 #include <linux/i2c.h> 28 #include "pmbus.h" 29 30 enum chips { lm25056, lm25063, lm25066, lm5064, lm5066 }; 31 32 #define LM25066_READ_VAUX 0xd0 33 #define LM25066_MFR_READ_IIN 0xd1 34 #define LM25066_MFR_READ_PIN 0xd2 35 #define LM25066_MFR_IIN_OC_WARN_LIMIT 0xd3 36 #define LM25066_MFR_PIN_OP_WARN_LIMIT 0xd4 37 #define LM25066_READ_PIN_PEAK 0xd5 38 #define LM25066_CLEAR_PIN_PEAK 0xd6 39 #define LM25066_DEVICE_SETUP 0xd9 40 #define LM25066_READ_AVG_VIN 0xdc 41 #define LM25066_READ_AVG_VOUT 0xdd 42 #define LM25066_READ_AVG_IIN 0xde 43 #define LM25066_READ_AVG_PIN 0xdf 44 45 #define LM25066_DEV_SETUP_CL (1 << 4) /* Current limit */ 46 47 /* LM25056 only */ 48 49 #define LM25056_VAUX_OV_WARN_LIMIT 0xe3 50 #define LM25056_VAUX_UV_WARN_LIMIT 0xe4 51 52 #define LM25056_MFR_STS_VAUX_OV_WARN (1 << 1) 53 #define LM25056_MFR_STS_VAUX_UV_WARN (1 << 0) 54 55 /* LM25063 only */ 56 57 #define LM25063_READ_VOUT_MAX 0xe5 58 #define LM25063_READ_VOUT_MIN 0xe6 59 60 struct __coeff { 61 short m, b, R; 62 }; 63 64 #define PSC_CURRENT_IN_L (PSC_NUM_CLASSES) 65 #define PSC_POWER_L (PSC_NUM_CLASSES + 1) 66 67 static struct __coeff lm25066_coeff[5][PSC_NUM_CLASSES + 2] = { 68 [lm25056] = { 69 [PSC_VOLTAGE_IN] = { 70 .m = 16296, 71 .R = -2, 72 }, 73 [PSC_CURRENT_IN] = { 74 .m = 13797, 75 .R = -2, 76 }, 77 [PSC_CURRENT_IN_L] = { 78 .m = 6726, 79 .R = -2, 80 }, 81 [PSC_POWER] = { 82 .m = 5501, 83 .R = -3, 84 }, 85 [PSC_POWER_L] = { 86 .m = 26882, 87 .R = -4, 88 }, 89 [PSC_TEMPERATURE] = { 90 .m = 1580, 91 .b = -14500, 92 .R = -2, 93 }, 94 }, 95 [lm25066] = { 96 [PSC_VOLTAGE_IN] = { 97 .m = 22070, 98 .R = -2, 99 }, 100 [PSC_VOLTAGE_OUT] = { 101 .m = 22070, 102 .R = -2, 103 }, 104 [PSC_CURRENT_IN] = { 105 .m = 13661, 106 .R = -2, 107 }, 108 [PSC_CURRENT_IN_L] = { 109 .m = 6852, 110 .R = -2, 111 }, 112 [PSC_POWER] = { 113 .m = 736, 114 .R = -2, 115 }, 116 [PSC_POWER_L] = { 117 .m = 369, 118 .R = -2, 119 }, 120 [PSC_TEMPERATURE] = { 121 .m = 16, 122 }, 123 }, 124 [lm25063] = { 125 [PSC_VOLTAGE_IN] = { 126 .m = 16000, 127 .R = -2, 128 }, 129 [PSC_VOLTAGE_OUT] = { 130 .m = 16000, 131 .R = -2, 132 }, 133 [PSC_CURRENT_IN] = { 134 .m = 10000, 135 .R = -2, 136 }, 137 [PSC_CURRENT_IN_L] = { 138 .m = 10000, 139 .R = -2, 140 }, 141 [PSC_POWER] = { 142 .m = 5000, 143 .R = -3, 144 }, 145 [PSC_POWER_L] = { 146 .m = 5000, 147 .R = -3, 148 }, 149 [PSC_TEMPERATURE] = { 150 .m = 15596, 151 .R = -3, 152 }, 153 }, 154 [lm5064] = { 155 [PSC_VOLTAGE_IN] = { 156 .m = 4611, 157 .R = -2, 158 }, 159 [PSC_VOLTAGE_OUT] = { 160 .m = 4621, 161 .R = -2, 162 }, 163 [PSC_CURRENT_IN] = { 164 .m = 10742, 165 .R = -2, 166 }, 167 [PSC_CURRENT_IN_L] = { 168 .m = 5456, 169 .R = -2, 170 }, 171 [PSC_POWER] = { 172 .m = 1204, 173 .R = -3, 174 }, 175 [PSC_POWER_L] = { 176 .m = 612, 177 .R = -3, 178 }, 179 [PSC_TEMPERATURE] = { 180 .m = 16, 181 }, 182 }, 183 [lm5066] = { 184 [PSC_VOLTAGE_IN] = { 185 .m = 4587, 186 .R = -2, 187 }, 188 [PSC_VOLTAGE_OUT] = { 189 .m = 4587, 190 .R = -2, 191 }, 192 [PSC_CURRENT_IN] = { 193 .m = 10753, 194 .R = -2, 195 }, 196 [PSC_CURRENT_IN_L] = { 197 .m = 5405, 198 .R = -2, 199 }, 200 [PSC_POWER] = { 201 .m = 1204, 202 .R = -3, 203 }, 204 [PSC_POWER_L] = { 205 .m = 605, 206 .R = -3, 207 }, 208 [PSC_TEMPERATURE] = { 209 .m = 16, 210 }, 211 }, 212 }; 213 214 struct lm25066_data { 215 int id; 216 u16 rlimit; /* Maximum register value */ 217 struct pmbus_driver_info info; 218 }; 219 220 #define to_lm25066_data(x) container_of(x, struct lm25066_data, info) 221 222 static int lm25066_read_word_data(struct i2c_client *client, int page, int reg) 223 { 224 const struct pmbus_driver_info *info = pmbus_get_driver_info(client); 225 const struct lm25066_data *data = to_lm25066_data(info); 226 int ret; 227 228 switch (reg) { 229 case PMBUS_VIRT_READ_VMON: 230 ret = pmbus_read_word_data(client, 0, LM25066_READ_VAUX); 231 if (ret < 0) 232 break; 233 /* Adjust returned value to match VIN coefficients */ 234 switch (data->id) { 235 case lm25056: 236 /* VIN: 6.14 mV VAUX: 293 uV LSB */ 237 ret = DIV_ROUND_CLOSEST(ret * 293, 6140); 238 break; 239 case lm25063: 240 /* VIN: 6.25 mV VAUX: 200.0 uV LSB */ 241 ret = DIV_ROUND_CLOSEST(ret * 20, 625); 242 break; 243 case lm25066: 244 /* VIN: 4.54 mV VAUX: 283.2 uV LSB */ 245 ret = DIV_ROUND_CLOSEST(ret * 2832, 45400); 246 break; 247 case lm5064: 248 /* VIN: 4.53 mV VAUX: 700 uV LSB */ 249 ret = DIV_ROUND_CLOSEST(ret * 70, 453); 250 break; 251 case lm5066: 252 /* VIN: 2.18 mV VAUX: 725 uV LSB */ 253 ret = DIV_ROUND_CLOSEST(ret * 725, 2180); 254 break; 255 } 256 break; 257 case PMBUS_READ_IIN: 258 ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_IIN); 259 break; 260 case PMBUS_READ_PIN: 261 ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_PIN); 262 break; 263 case PMBUS_IIN_OC_WARN_LIMIT: 264 ret = pmbus_read_word_data(client, 0, 265 LM25066_MFR_IIN_OC_WARN_LIMIT); 266 break; 267 case PMBUS_PIN_OP_WARN_LIMIT: 268 ret = pmbus_read_word_data(client, 0, 269 LM25066_MFR_PIN_OP_WARN_LIMIT); 270 break; 271 case PMBUS_VIRT_READ_VIN_AVG: 272 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VIN); 273 break; 274 case PMBUS_VIRT_READ_VOUT_AVG: 275 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VOUT); 276 break; 277 case PMBUS_VIRT_READ_IIN_AVG: 278 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_IIN); 279 break; 280 case PMBUS_VIRT_READ_PIN_AVG: 281 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_PIN); 282 break; 283 case PMBUS_VIRT_READ_PIN_MAX: 284 ret = pmbus_read_word_data(client, 0, LM25066_READ_PIN_PEAK); 285 break; 286 case PMBUS_VIRT_RESET_PIN_HISTORY: 287 ret = 0; 288 break; 289 default: 290 ret = -ENODATA; 291 break; 292 } 293 return ret; 294 } 295 296 static int lm25063_read_word_data(struct i2c_client *client, int page, int reg) 297 { 298 int ret; 299 300 switch (reg) { 301 case PMBUS_VIRT_READ_VOUT_MAX: 302 ret = pmbus_read_word_data(client, 0, LM25063_READ_VOUT_MAX); 303 break; 304 case PMBUS_VIRT_READ_VOUT_MIN: 305 ret = pmbus_read_word_data(client, 0, LM25063_READ_VOUT_MIN); 306 break; 307 default: 308 ret = lm25066_read_word_data(client, page, reg); 309 break; 310 } 311 return ret; 312 } 313 314 static int lm25056_read_word_data(struct i2c_client *client, int page, int reg) 315 { 316 int ret; 317 318 switch (reg) { 319 case PMBUS_VIRT_VMON_UV_WARN_LIMIT: 320 ret = pmbus_read_word_data(client, 0, 321 LM25056_VAUX_UV_WARN_LIMIT); 322 if (ret < 0) 323 break; 324 /* Adjust returned value to match VIN coefficients */ 325 ret = DIV_ROUND_CLOSEST(ret * 293, 6140); 326 break; 327 case PMBUS_VIRT_VMON_OV_WARN_LIMIT: 328 ret = pmbus_read_word_data(client, 0, 329 LM25056_VAUX_OV_WARN_LIMIT); 330 if (ret < 0) 331 break; 332 /* Adjust returned value to match VIN coefficients */ 333 ret = DIV_ROUND_CLOSEST(ret * 293, 6140); 334 break; 335 default: 336 ret = lm25066_read_word_data(client, page, reg); 337 break; 338 } 339 return ret; 340 } 341 342 static int lm25056_read_byte_data(struct i2c_client *client, int page, int reg) 343 { 344 int ret, s; 345 346 switch (reg) { 347 case PMBUS_VIRT_STATUS_VMON: 348 ret = pmbus_read_byte_data(client, 0, 349 PMBUS_STATUS_MFR_SPECIFIC); 350 if (ret < 0) 351 break; 352 s = 0; 353 if (ret & LM25056_MFR_STS_VAUX_UV_WARN) 354 s |= PB_VOLTAGE_UV_WARNING; 355 if (ret & LM25056_MFR_STS_VAUX_OV_WARN) 356 s |= PB_VOLTAGE_OV_WARNING; 357 ret = s; 358 break; 359 default: 360 ret = -ENODATA; 361 break; 362 } 363 return ret; 364 } 365 366 static int lm25066_write_word_data(struct i2c_client *client, int page, int reg, 367 u16 word) 368 { 369 const struct pmbus_driver_info *info = pmbus_get_driver_info(client); 370 const struct lm25066_data *data = to_lm25066_data(info); 371 int ret; 372 373 switch (reg) { 374 case PMBUS_POUT_OP_FAULT_LIMIT: 375 case PMBUS_POUT_OP_WARN_LIMIT: 376 case PMBUS_VOUT_UV_WARN_LIMIT: 377 case PMBUS_OT_FAULT_LIMIT: 378 case PMBUS_OT_WARN_LIMIT: 379 case PMBUS_IIN_OC_FAULT_LIMIT: 380 case PMBUS_VIN_UV_WARN_LIMIT: 381 case PMBUS_VIN_UV_FAULT_LIMIT: 382 case PMBUS_VIN_OV_FAULT_LIMIT: 383 case PMBUS_VIN_OV_WARN_LIMIT: 384 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit); 385 ret = pmbus_write_word_data(client, 0, reg, word); 386 pmbus_clear_cache(client); 387 break; 388 case PMBUS_IIN_OC_WARN_LIMIT: 389 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit); 390 ret = pmbus_write_word_data(client, 0, 391 LM25066_MFR_IIN_OC_WARN_LIMIT, 392 word); 393 pmbus_clear_cache(client); 394 break; 395 case PMBUS_PIN_OP_WARN_LIMIT: 396 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit); 397 ret = pmbus_write_word_data(client, 0, 398 LM25066_MFR_PIN_OP_WARN_LIMIT, 399 word); 400 pmbus_clear_cache(client); 401 break; 402 case PMBUS_VIRT_VMON_UV_WARN_LIMIT: 403 /* Adjust from VIN coefficients (for LM25056) */ 404 word = DIV_ROUND_CLOSEST((int)word * 6140, 293); 405 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit); 406 ret = pmbus_write_word_data(client, 0, 407 LM25056_VAUX_UV_WARN_LIMIT, word); 408 pmbus_clear_cache(client); 409 break; 410 case PMBUS_VIRT_VMON_OV_WARN_LIMIT: 411 /* Adjust from VIN coefficients (for LM25056) */ 412 word = DIV_ROUND_CLOSEST((int)word * 6140, 293); 413 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit); 414 ret = pmbus_write_word_data(client, 0, 415 LM25056_VAUX_OV_WARN_LIMIT, word); 416 pmbus_clear_cache(client); 417 break; 418 case PMBUS_VIRT_RESET_PIN_HISTORY: 419 ret = pmbus_write_byte(client, 0, LM25066_CLEAR_PIN_PEAK); 420 break; 421 default: 422 ret = -ENODATA; 423 break; 424 } 425 return ret; 426 } 427 428 static int lm25066_probe(struct i2c_client *client, 429 const struct i2c_device_id *id) 430 { 431 int config; 432 struct lm25066_data *data; 433 struct pmbus_driver_info *info; 434 struct __coeff *coeff; 435 436 if (!i2c_check_functionality(client->adapter, 437 I2C_FUNC_SMBUS_READ_BYTE_DATA)) 438 return -ENODEV; 439 440 data = devm_kzalloc(&client->dev, sizeof(struct lm25066_data), 441 GFP_KERNEL); 442 if (!data) 443 return -ENOMEM; 444 445 config = i2c_smbus_read_byte_data(client, LM25066_DEVICE_SETUP); 446 if (config < 0) 447 return config; 448 449 data->id = id->driver_data; 450 info = &data->info; 451 452 info->pages = 1; 453 info->format[PSC_VOLTAGE_IN] = direct; 454 info->format[PSC_VOLTAGE_OUT] = direct; 455 info->format[PSC_CURRENT_IN] = direct; 456 info->format[PSC_TEMPERATURE] = direct; 457 info->format[PSC_POWER] = direct; 458 459 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VMON 460 | PMBUS_HAVE_PIN | PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT 461 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP; 462 463 if (data->id == lm25056) { 464 info->func[0] |= PMBUS_HAVE_STATUS_VMON; 465 info->read_word_data = lm25056_read_word_data; 466 info->read_byte_data = lm25056_read_byte_data; 467 data->rlimit = 0x0fff; 468 } else if (data->id == lm25063) { 469 info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 470 | PMBUS_HAVE_POUT; 471 info->read_word_data = lm25063_read_word_data; 472 data->rlimit = 0xffff; 473 } else { 474 info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT; 475 info->read_word_data = lm25066_read_word_data; 476 data->rlimit = 0x0fff; 477 } 478 info->write_word_data = lm25066_write_word_data; 479 480 coeff = &lm25066_coeff[data->id][0]; 481 info->m[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].m; 482 info->b[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].b; 483 info->R[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].R; 484 info->m[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].m; 485 info->b[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].b; 486 info->R[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].R; 487 info->m[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].m; 488 info->b[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].b; 489 info->R[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].R; 490 info->b[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].b; 491 info->R[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].R; 492 info->b[PSC_POWER] = coeff[PSC_POWER].b; 493 info->R[PSC_POWER] = coeff[PSC_POWER].R; 494 if (config & LM25066_DEV_SETUP_CL) { 495 info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN_L].m; 496 info->m[PSC_POWER] = coeff[PSC_POWER_L].m; 497 } else { 498 info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].m; 499 info->m[PSC_POWER] = coeff[PSC_POWER].m; 500 } 501 502 return pmbus_do_probe(client, id, info); 503 } 504 505 static const struct i2c_device_id lm25066_id[] = { 506 {"lm25056", lm25056}, 507 {"lm25063", lm25063}, 508 {"lm25066", lm25066}, 509 {"lm5064", lm5064}, 510 {"lm5066", lm5066}, 511 { } 512 }; 513 514 MODULE_DEVICE_TABLE(i2c, lm25066_id); 515 516 /* This is the driver that will be inserted */ 517 static struct i2c_driver lm25066_driver = { 518 .driver = { 519 .name = "lm25066", 520 }, 521 .probe = lm25066_probe, 522 .remove = pmbus_do_remove, 523 .id_table = lm25066_id, 524 }; 525 526 module_i2c_driver(lm25066_driver); 527 528 MODULE_AUTHOR("Guenter Roeck"); 529 MODULE_DESCRIPTION("PMBus driver for LM25066 and compatible chips"); 530 MODULE_LICENSE("GPL"); 531