| 1 | /* |
| 2 | * Hardware monitoring driver for PMBus devices |
| 3 | * |
| 4 | * Copyright (c) 2010, 2011 Ericsson AB. |
| 5 | * Copyright (c) 2012 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 <linux/hwmon.h> |
| 29 | #include <linux/hwmon-sysfs.h> |
| 30 | #include <linux/jiffies.h> |
| 31 | #include <linux/i2c/pmbus.h> |
| 32 | #include "pmbus.h" |
| 33 | |
| 34 | /* |
| 35 | * Number of additional attribute pointers to allocate |
| 36 | * with each call to krealloc |
| 37 | */ |
| 38 | #define PMBUS_ATTR_ALLOC_SIZE 32 |
| 39 | |
| 40 | /* |
| 41 | * Index into status register array, per status register group |
| 42 | */ |
| 43 | #define PB_STATUS_BASE 0 |
| 44 | #define PB_STATUS_VOUT_BASE (PB_STATUS_BASE + PMBUS_PAGES) |
| 45 | #define PB_STATUS_IOUT_BASE (PB_STATUS_VOUT_BASE + PMBUS_PAGES) |
| 46 | #define PB_STATUS_FAN_BASE (PB_STATUS_IOUT_BASE + PMBUS_PAGES) |
| 47 | #define PB_STATUS_FAN34_BASE (PB_STATUS_FAN_BASE + PMBUS_PAGES) |
| 48 | #define PB_STATUS_TEMP_BASE (PB_STATUS_FAN34_BASE + PMBUS_PAGES) |
| 49 | #define PB_STATUS_INPUT_BASE (PB_STATUS_TEMP_BASE + PMBUS_PAGES) |
| 50 | #define PB_STATUS_VMON_BASE (PB_STATUS_INPUT_BASE + 1) |
| 51 | |
| 52 | #define PB_NUM_STATUS_REG (PB_STATUS_VMON_BASE + 1) |
| 53 | |
| 54 | #define PMBUS_NAME_SIZE 24 |
| 55 | |
| 56 | struct pmbus_sensor { |
| 57 | struct pmbus_sensor *next; |
| 58 | char name[PMBUS_NAME_SIZE]; /* sysfs sensor name */ |
| 59 | struct device_attribute attribute; |
| 60 | u8 page; /* page number */ |
| 61 | u16 reg; /* register */ |
| 62 | enum pmbus_sensor_classes class; /* sensor class */ |
| 63 | bool update; /* runtime sensor update needed */ |
| 64 | int data; /* Sensor data. |
| 65 | Negative if there was a read error */ |
| 66 | }; |
| 67 | #define to_pmbus_sensor(_attr) \ |
| 68 | container_of(_attr, struct pmbus_sensor, attribute) |
| 69 | |
| 70 | struct pmbus_boolean { |
| 71 | char name[PMBUS_NAME_SIZE]; /* sysfs boolean name */ |
| 72 | struct sensor_device_attribute attribute; |
| 73 | struct pmbus_sensor *s1; |
| 74 | struct pmbus_sensor *s2; |
| 75 | }; |
| 76 | #define to_pmbus_boolean(_attr) \ |
| 77 | container_of(_attr, struct pmbus_boolean, attribute) |
| 78 | |
| 79 | struct pmbus_label { |
| 80 | char name[PMBUS_NAME_SIZE]; /* sysfs label name */ |
| 81 | struct device_attribute attribute; |
| 82 | char label[PMBUS_NAME_SIZE]; /* label */ |
| 83 | }; |
| 84 | #define to_pmbus_label(_attr) \ |
| 85 | container_of(_attr, struct pmbus_label, attribute) |
| 86 | |
| 87 | struct pmbus_data { |
| 88 | struct device *dev; |
| 89 | struct device *hwmon_dev; |
| 90 | |
| 91 | u32 flags; /* from platform data */ |
| 92 | |
| 93 | int exponent; /* linear mode: exponent for output voltages */ |
| 94 | |
| 95 | const struct pmbus_driver_info *info; |
| 96 | |
| 97 | int max_attributes; |
| 98 | int num_attributes; |
| 99 | struct attribute_group group; |
| 100 | |
| 101 | struct pmbus_sensor *sensors; |
| 102 | |
| 103 | struct mutex update_lock; |
| 104 | bool valid; |
| 105 | unsigned long last_updated; /* in jiffies */ |
| 106 | |
| 107 | /* |
| 108 | * A single status register covers multiple attributes, |
| 109 | * so we keep them all together. |
| 110 | */ |
| 111 | u8 status[PB_NUM_STATUS_REG]; |
| 112 | u8 status_register; |
| 113 | |
| 114 | u8 currpage; |
| 115 | }; |
| 116 | |
| 117 | void pmbus_clear_cache(struct i2c_client *client) |
| 118 | { |
| 119 | struct pmbus_data *data = i2c_get_clientdata(client); |
| 120 | |
| 121 | data->valid = false; |
| 122 | } |
| 123 | EXPORT_SYMBOL_GPL(pmbus_clear_cache); |
| 124 | |
| 125 | int pmbus_set_page(struct i2c_client *client, u8 page) |
| 126 | { |
| 127 | struct pmbus_data *data = i2c_get_clientdata(client); |
| 128 | int rv = 0; |
| 129 | int newpage; |
| 130 | |
| 131 | if (page != data->currpage) { |
| 132 | rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page); |
| 133 | newpage = i2c_smbus_read_byte_data(client, PMBUS_PAGE); |
| 134 | if (newpage != page) |
| 135 | rv = -EIO; |
| 136 | else |
| 137 | data->currpage = page; |
| 138 | } |
| 139 | return rv; |
| 140 | } |
| 141 | EXPORT_SYMBOL_GPL(pmbus_set_page); |
| 142 | |
| 143 | int pmbus_write_byte(struct i2c_client *client, int page, u8 value) |
| 144 | { |
| 145 | int rv; |
| 146 | |
| 147 | if (page >= 0) { |
| 148 | rv = pmbus_set_page(client, page); |
| 149 | if (rv < 0) |
| 150 | return rv; |
| 151 | } |
| 152 | |
| 153 | return i2c_smbus_write_byte(client, value); |
| 154 | } |
| 155 | EXPORT_SYMBOL_GPL(pmbus_write_byte); |
| 156 | |
| 157 | /* |
| 158 | * _pmbus_write_byte() is similar to pmbus_write_byte(), but checks if |
| 159 | * a device specific mapping funcion exists and calls it if necessary. |
| 160 | */ |
| 161 | static int _pmbus_write_byte(struct i2c_client *client, int page, u8 value) |
| 162 | { |
| 163 | struct pmbus_data *data = i2c_get_clientdata(client); |
| 164 | const struct pmbus_driver_info *info = data->info; |
| 165 | int status; |
| 166 | |
| 167 | if (info->write_byte) { |
| 168 | status = info->write_byte(client, page, value); |
| 169 | if (status != -ENODATA) |
| 170 | return status; |
| 171 | } |
| 172 | return pmbus_write_byte(client, page, value); |
| 173 | } |
| 174 | |
| 175 | int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg, u16 word) |
| 176 | { |
| 177 | int rv; |
| 178 | |
| 179 | rv = pmbus_set_page(client, page); |
| 180 | if (rv < 0) |
| 181 | return rv; |
| 182 | |
| 183 | return i2c_smbus_write_word_data(client, reg, word); |
| 184 | } |
| 185 | EXPORT_SYMBOL_GPL(pmbus_write_word_data); |
| 186 | |
| 187 | /* |
| 188 | * _pmbus_write_word_data() is similar to pmbus_write_word_data(), but checks if |
| 189 | * a device specific mapping function exists and calls it if necessary. |
| 190 | */ |
| 191 | static int _pmbus_write_word_data(struct i2c_client *client, int page, int reg, |
| 192 | u16 word) |
| 193 | { |
| 194 | struct pmbus_data *data = i2c_get_clientdata(client); |
| 195 | const struct pmbus_driver_info *info = data->info; |
| 196 | int status; |
| 197 | |
| 198 | if (info->write_word_data) { |
| 199 | status = info->write_word_data(client, page, reg, word); |
| 200 | if (status != -ENODATA) |
| 201 | return status; |
| 202 | } |
| 203 | if (reg >= PMBUS_VIRT_BASE) |
| 204 | return -ENXIO; |
| 205 | return pmbus_write_word_data(client, page, reg, word); |
| 206 | } |
| 207 | |
| 208 | int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg) |
| 209 | { |
| 210 | int rv; |
| 211 | |
| 212 | rv = pmbus_set_page(client, page); |
| 213 | if (rv < 0) |
| 214 | return rv; |
| 215 | |
| 216 | return i2c_smbus_read_word_data(client, reg); |
| 217 | } |
| 218 | EXPORT_SYMBOL_GPL(pmbus_read_word_data); |
| 219 | |
| 220 | /* |
| 221 | * _pmbus_read_word_data() is similar to pmbus_read_word_data(), but checks if |
| 222 | * a device specific mapping function exists and calls it if necessary. |
| 223 | */ |
| 224 | static int _pmbus_read_word_data(struct i2c_client *client, int page, int reg) |
| 225 | { |
| 226 | struct pmbus_data *data = i2c_get_clientdata(client); |
| 227 | const struct pmbus_driver_info *info = data->info; |
| 228 | int status; |
| 229 | |
| 230 | if (info->read_word_data) { |
| 231 | status = info->read_word_data(client, page, reg); |
| 232 | if (status != -ENODATA) |
| 233 | return status; |
| 234 | } |
| 235 | if (reg >= PMBUS_VIRT_BASE) |
| 236 | return -ENXIO; |
| 237 | return pmbus_read_word_data(client, page, reg); |
| 238 | } |
| 239 | |
| 240 | int pmbus_read_byte_data(struct i2c_client *client, int page, u8 reg) |
| 241 | { |
| 242 | int rv; |
| 243 | |
| 244 | if (page >= 0) { |
| 245 | rv = pmbus_set_page(client, page); |
| 246 | if (rv < 0) |
| 247 | return rv; |
| 248 | } |
| 249 | |
| 250 | return i2c_smbus_read_byte_data(client, reg); |
| 251 | } |
| 252 | EXPORT_SYMBOL_GPL(pmbus_read_byte_data); |
| 253 | |
| 254 | /* |
| 255 | * _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if |
| 256 | * a device specific mapping function exists and calls it if necessary. |
| 257 | */ |
| 258 | static int _pmbus_read_byte_data(struct i2c_client *client, int page, int reg) |
| 259 | { |
| 260 | struct pmbus_data *data = i2c_get_clientdata(client); |
| 261 | const struct pmbus_driver_info *info = data->info; |
| 262 | int status; |
| 263 | |
| 264 | if (info->read_byte_data) { |
| 265 | status = info->read_byte_data(client, page, reg); |
| 266 | if (status != -ENODATA) |
| 267 | return status; |
| 268 | } |
| 269 | return pmbus_read_byte_data(client, page, reg); |
| 270 | } |
| 271 | |
| 272 | static void pmbus_clear_fault_page(struct i2c_client *client, int page) |
| 273 | { |
| 274 | _pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS); |
| 275 | } |
| 276 | |
| 277 | void pmbus_clear_faults(struct i2c_client *client) |
| 278 | { |
| 279 | struct pmbus_data *data = i2c_get_clientdata(client); |
| 280 | int i; |
| 281 | |
| 282 | for (i = 0; i < data->info->pages; i++) |
| 283 | pmbus_clear_fault_page(client, i); |
| 284 | } |
| 285 | EXPORT_SYMBOL_GPL(pmbus_clear_faults); |
| 286 | |
| 287 | static int pmbus_check_status_cml(struct i2c_client *client) |
| 288 | { |
| 289 | struct pmbus_data *data = i2c_get_clientdata(client); |
| 290 | int status, status2; |
| 291 | |
| 292 | status = _pmbus_read_byte_data(client, -1, data->status_register); |
| 293 | if (status < 0 || (status & PB_STATUS_CML)) { |
| 294 | status2 = _pmbus_read_byte_data(client, -1, PMBUS_STATUS_CML); |
| 295 | if (status2 < 0 || (status2 & PB_CML_FAULT_INVALID_COMMAND)) |
| 296 | return -EIO; |
| 297 | } |
| 298 | return 0; |
| 299 | } |
| 300 | |
| 301 | static bool pmbus_check_register(struct i2c_client *client, |
| 302 | int (*func)(struct i2c_client *client, |
| 303 | int page, int reg), |
| 304 | int page, int reg) |
| 305 | { |
| 306 | int rv; |
| 307 | struct pmbus_data *data = i2c_get_clientdata(client); |
| 308 | |
| 309 | rv = func(client, page, reg); |
| 310 | if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK)) |
| 311 | rv = pmbus_check_status_cml(client); |
| 312 | pmbus_clear_fault_page(client, -1); |
| 313 | return rv >= 0; |
| 314 | } |
| 315 | |
| 316 | bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg) |
| 317 | { |
| 318 | return pmbus_check_register(client, _pmbus_read_byte_data, page, reg); |
| 319 | } |
| 320 | EXPORT_SYMBOL_GPL(pmbus_check_byte_register); |
| 321 | |
| 322 | bool pmbus_check_word_register(struct i2c_client *client, int page, int reg) |
| 323 | { |
| 324 | return pmbus_check_register(client, _pmbus_read_word_data, page, reg); |
| 325 | } |
| 326 | EXPORT_SYMBOL_GPL(pmbus_check_word_register); |
| 327 | |
| 328 | const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client *client) |
| 329 | { |
| 330 | struct pmbus_data *data = i2c_get_clientdata(client); |
| 331 | |
| 332 | return data->info; |
| 333 | } |
| 334 | EXPORT_SYMBOL_GPL(pmbus_get_driver_info); |
| 335 | |
| 336 | static struct _pmbus_status { |
| 337 | u32 func; |
| 338 | u16 base; |
| 339 | u16 reg; |
| 340 | } pmbus_status[] = { |
| 341 | { PMBUS_HAVE_STATUS_VOUT, PB_STATUS_VOUT_BASE, PMBUS_STATUS_VOUT }, |
| 342 | { PMBUS_HAVE_STATUS_IOUT, PB_STATUS_IOUT_BASE, PMBUS_STATUS_IOUT }, |
| 343 | { PMBUS_HAVE_STATUS_TEMP, PB_STATUS_TEMP_BASE, |
| 344 | PMBUS_STATUS_TEMPERATURE }, |
| 345 | { PMBUS_HAVE_STATUS_FAN12, PB_STATUS_FAN_BASE, PMBUS_STATUS_FAN_12 }, |
| 346 | { PMBUS_HAVE_STATUS_FAN34, PB_STATUS_FAN34_BASE, PMBUS_STATUS_FAN_34 }, |
| 347 | }; |
| 348 | |
| 349 | static struct pmbus_data *pmbus_update_device(struct device *dev) |
| 350 | { |
| 351 | struct i2c_client *client = to_i2c_client(dev); |
| 352 | struct pmbus_data *data = i2c_get_clientdata(client); |
| 353 | const struct pmbus_driver_info *info = data->info; |
| 354 | struct pmbus_sensor *sensor; |
| 355 | |
| 356 | mutex_lock(&data->update_lock); |
| 357 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { |
| 358 | int i, j; |
| 359 | |
| 360 | for (i = 0; i < info->pages; i++) { |
| 361 | data->status[PB_STATUS_BASE + i] |
| 362 | = _pmbus_read_byte_data(client, i, |
| 363 | data->status_register); |
| 364 | for (j = 0; j < ARRAY_SIZE(pmbus_status); j++) { |
| 365 | struct _pmbus_status *s = &pmbus_status[j]; |
| 366 | |
| 367 | if (!(info->func[i] & s->func)) |
| 368 | continue; |
| 369 | data->status[s->base + i] |
| 370 | = _pmbus_read_byte_data(client, i, |
| 371 | s->reg); |
| 372 | } |
| 373 | } |
| 374 | |
| 375 | if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) |
| 376 | data->status[PB_STATUS_INPUT_BASE] |
| 377 | = _pmbus_read_byte_data(client, 0, |
| 378 | PMBUS_STATUS_INPUT); |
| 379 | |
| 380 | if (info->func[0] & PMBUS_HAVE_STATUS_VMON) |
| 381 | data->status[PB_STATUS_VMON_BASE] |
| 382 | = _pmbus_read_byte_data(client, 0, |
| 383 | PMBUS_VIRT_STATUS_VMON); |
| 384 | |
| 385 | for (sensor = data->sensors; sensor; sensor = sensor->next) { |
| 386 | if (!data->valid || sensor->update) |
| 387 | sensor->data |
| 388 | = _pmbus_read_word_data(client, |
| 389 | sensor->page, |
| 390 | sensor->reg); |
| 391 | } |
| 392 | pmbus_clear_faults(client); |
| 393 | data->last_updated = jiffies; |
| 394 | data->valid = 1; |
| 395 | } |
| 396 | mutex_unlock(&data->update_lock); |
| 397 | return data; |
| 398 | } |
| 399 | |
| 400 | /* |
| 401 | * Convert linear sensor values to milli- or micro-units |
| 402 | * depending on sensor type. |
| 403 | */ |
| 404 | static long pmbus_reg2data_linear(struct pmbus_data *data, |
| 405 | struct pmbus_sensor *sensor) |
| 406 | { |
| 407 | s16 exponent; |
| 408 | s32 mantissa; |
| 409 | long val; |
| 410 | |
| 411 | if (sensor->class == PSC_VOLTAGE_OUT) { /* LINEAR16 */ |
| 412 | exponent = data->exponent; |
| 413 | mantissa = (u16) sensor->data; |
| 414 | } else { /* LINEAR11 */ |
| 415 | exponent = ((s16)sensor->data) >> 11; |
| 416 | mantissa = ((s16)((sensor->data & 0x7ff) << 5)) >> 5; |
| 417 | } |
| 418 | |
| 419 | val = mantissa; |
| 420 | |
| 421 | /* scale result to milli-units for all sensors except fans */ |
| 422 | if (sensor->class != PSC_FAN) |
| 423 | val = val * 1000L; |
| 424 | |
| 425 | /* scale result to micro-units for power sensors */ |
| 426 | if (sensor->class == PSC_POWER) |
| 427 | val = val * 1000L; |
| 428 | |
| 429 | if (exponent >= 0) |
| 430 | val <<= exponent; |
| 431 | else |
| 432 | val >>= -exponent; |
| 433 | |
| 434 | return val; |
| 435 | } |
| 436 | |
| 437 | /* |
| 438 | * Convert direct sensor values to milli- or micro-units |
| 439 | * depending on sensor type. |
| 440 | */ |
| 441 | static long pmbus_reg2data_direct(struct pmbus_data *data, |
| 442 | struct pmbus_sensor *sensor) |
| 443 | { |
| 444 | long val = (s16) sensor->data; |
| 445 | long m, b, R; |
| 446 | |
| 447 | m = data->info->m[sensor->class]; |
| 448 | b = data->info->b[sensor->class]; |
| 449 | R = data->info->R[sensor->class]; |
| 450 | |
| 451 | if (m == 0) |
| 452 | return 0; |
| 453 | |
| 454 | /* X = 1/m * (Y * 10^-R - b) */ |
| 455 | R = -R; |
| 456 | /* scale result to milli-units for everything but fans */ |
| 457 | if (sensor->class != PSC_FAN) { |
| 458 | R += 3; |
| 459 | b *= 1000; |
| 460 | } |
| 461 | |
| 462 | /* scale result to micro-units for power sensors */ |
| 463 | if (sensor->class == PSC_POWER) { |
| 464 | R += 3; |
| 465 | b *= 1000; |
| 466 | } |
| 467 | |
| 468 | while (R > 0) { |
| 469 | val *= 10; |
| 470 | R--; |
| 471 | } |
| 472 | while (R < 0) { |
| 473 | val = DIV_ROUND_CLOSEST(val, 10); |
| 474 | R++; |
| 475 | } |
| 476 | |
| 477 | return (val - b) / m; |
| 478 | } |
| 479 | |
| 480 | /* |
| 481 | * Convert VID sensor values to milli- or micro-units |
| 482 | * depending on sensor type. |
| 483 | * We currently only support VR11. |
| 484 | */ |
| 485 | static long pmbus_reg2data_vid(struct pmbus_data *data, |
| 486 | struct pmbus_sensor *sensor) |
| 487 | { |
| 488 | long val = sensor->data; |
| 489 | |
| 490 | if (val < 0x02 || val > 0xb2) |
| 491 | return 0; |
| 492 | return DIV_ROUND_CLOSEST(160000 - (val - 2) * 625, 100); |
| 493 | } |
| 494 | |
| 495 | static long pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor) |
| 496 | { |
| 497 | long val; |
| 498 | |
| 499 | switch (data->info->format[sensor->class]) { |
| 500 | case direct: |
| 501 | val = pmbus_reg2data_direct(data, sensor); |
| 502 | break; |
| 503 | case vid: |
| 504 | val = pmbus_reg2data_vid(data, sensor); |
| 505 | break; |
| 506 | case linear: |
| 507 | default: |
| 508 | val = pmbus_reg2data_linear(data, sensor); |
| 509 | break; |
| 510 | } |
| 511 | return val; |
| 512 | } |
| 513 | |
| 514 | #define MAX_MANTISSA (1023 * 1000) |
| 515 | #define MIN_MANTISSA (511 * 1000) |
| 516 | |
| 517 | static u16 pmbus_data2reg_linear(struct pmbus_data *data, |
| 518 | enum pmbus_sensor_classes class, long val) |
| 519 | { |
| 520 | s16 exponent = 0, mantissa; |
| 521 | bool negative = false; |
| 522 | |
| 523 | /* simple case */ |
| 524 | if (val == 0) |
| 525 | return 0; |
| 526 | |
| 527 | if (class == PSC_VOLTAGE_OUT) { |
| 528 | /* LINEAR16 does not support negative voltages */ |
| 529 | if (val < 0) |
| 530 | return 0; |
| 531 | |
| 532 | /* |
| 533 | * For a static exponents, we don't have a choice |
| 534 | * but to adjust the value to it. |
| 535 | */ |
| 536 | if (data->exponent < 0) |
| 537 | val <<= -data->exponent; |
| 538 | else |
| 539 | val >>= data->exponent; |
| 540 | val = DIV_ROUND_CLOSEST(val, 1000); |
| 541 | return val & 0xffff; |
| 542 | } |
| 543 | |
| 544 | if (val < 0) { |
| 545 | negative = true; |
| 546 | val = -val; |
| 547 | } |
| 548 | |
| 549 | /* Power is in uW. Convert to mW before converting. */ |
| 550 | if (class == PSC_POWER) |
| 551 | val = DIV_ROUND_CLOSEST(val, 1000L); |
| 552 | |
| 553 | /* |
| 554 | * For simplicity, convert fan data to milli-units |
| 555 | * before calculating the exponent. |
| 556 | */ |
| 557 | if (class == PSC_FAN) |
| 558 | val = val * 1000; |
| 559 | |
| 560 | /* Reduce large mantissa until it fits into 10 bit */ |
| 561 | while (val >= MAX_MANTISSA && exponent < 15) { |
| 562 | exponent++; |
| 563 | val >>= 1; |
| 564 | } |
| 565 | /* Increase small mantissa to improve precision */ |
| 566 | while (val < MIN_MANTISSA && exponent > -15) { |
| 567 | exponent--; |
| 568 | val <<= 1; |
| 569 | } |
| 570 | |
| 571 | /* Convert mantissa from milli-units to units */ |
| 572 | mantissa = DIV_ROUND_CLOSEST(val, 1000); |
| 573 | |
| 574 | /* Ensure that resulting number is within range */ |
| 575 | if (mantissa > 0x3ff) |
| 576 | mantissa = 0x3ff; |
| 577 | |
| 578 | /* restore sign */ |
| 579 | if (negative) |
| 580 | mantissa = -mantissa; |
| 581 | |
| 582 | /* Convert to 5 bit exponent, 11 bit mantissa */ |
| 583 | return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800); |
| 584 | } |
| 585 | |
| 586 | static u16 pmbus_data2reg_direct(struct pmbus_data *data, |
| 587 | enum pmbus_sensor_classes class, long val) |
| 588 | { |
| 589 | long m, b, R; |
| 590 | |
| 591 | m = data->info->m[class]; |
| 592 | b = data->info->b[class]; |
| 593 | R = data->info->R[class]; |
| 594 | |
| 595 | /* Power is in uW. Adjust R and b. */ |
| 596 | if (class == PSC_POWER) { |
| 597 | R -= 3; |
| 598 | b *= 1000; |
| 599 | } |
| 600 | |
| 601 | /* Calculate Y = (m * X + b) * 10^R */ |
| 602 | if (class != PSC_FAN) { |
| 603 | R -= 3; /* Adjust R and b for data in milli-units */ |
| 604 | b *= 1000; |
| 605 | } |
| 606 | val = val * m + b; |
| 607 | |
| 608 | while (R > 0) { |
| 609 | val *= 10; |
| 610 | R--; |
| 611 | } |
| 612 | while (R < 0) { |
| 613 | val = DIV_ROUND_CLOSEST(val, 10); |
| 614 | R++; |
| 615 | } |
| 616 | |
| 617 | return val; |
| 618 | } |
| 619 | |
| 620 | static u16 pmbus_data2reg_vid(struct pmbus_data *data, |
| 621 | enum pmbus_sensor_classes class, long val) |
| 622 | { |
| 623 | val = clamp_val(val, 500, 1600); |
| 624 | |
| 625 | return 2 + DIV_ROUND_CLOSEST((1600 - val) * 100, 625); |
| 626 | } |
| 627 | |
| 628 | static u16 pmbus_data2reg(struct pmbus_data *data, |
| 629 | enum pmbus_sensor_classes class, long val) |
| 630 | { |
| 631 | u16 regval; |
| 632 | |
| 633 | switch (data->info->format[class]) { |
| 634 | case direct: |
| 635 | regval = pmbus_data2reg_direct(data, class, val); |
| 636 | break; |
| 637 | case vid: |
| 638 | regval = pmbus_data2reg_vid(data, class, val); |
| 639 | break; |
| 640 | case linear: |
| 641 | default: |
| 642 | regval = pmbus_data2reg_linear(data, class, val); |
| 643 | break; |
| 644 | } |
| 645 | return regval; |
| 646 | } |
| 647 | |
| 648 | /* |
| 649 | * Return boolean calculated from converted data. |
| 650 | * <index> defines a status register index and mask. |
| 651 | * The mask is in the lower 8 bits, the register index is in bits 8..23. |
| 652 | * |
| 653 | * The associated pmbus_boolean structure contains optional pointers to two |
| 654 | * sensor attributes. If specified, those attributes are compared against each |
| 655 | * other to determine if a limit has been exceeded. |
| 656 | * |
| 657 | * If the sensor attribute pointers are NULL, the function returns true if |
| 658 | * (status[reg] & mask) is true. |
| 659 | * |
| 660 | * If sensor attribute pointers are provided, a comparison against a specified |
| 661 | * limit has to be performed to determine the boolean result. |
| 662 | * In this case, the function returns true if v1 >= v2 (where v1 and v2 are |
| 663 | * sensor values referenced by sensor attribute pointers s1 and s2). |
| 664 | * |
| 665 | * To determine if an object exceeds upper limits, specify <s1,s2> = <v,limit>. |
| 666 | * To determine if an object exceeds lower limits, specify <s1,s2> = <limit,v>. |
| 667 | * |
| 668 | * If a negative value is stored in any of the referenced registers, this value |
| 669 | * reflects an error code which will be returned. |
| 670 | */ |
| 671 | static int pmbus_get_boolean(struct pmbus_data *data, struct pmbus_boolean *b, |
| 672 | int index) |
| 673 | { |
| 674 | struct pmbus_sensor *s1 = b->s1; |
| 675 | struct pmbus_sensor *s2 = b->s2; |
| 676 | u16 reg = (index >> 8) & 0xffff; |
| 677 | u8 mask = index & 0xff; |
| 678 | int ret, status; |
| 679 | u8 regval; |
| 680 | |
| 681 | status = data->status[reg]; |
| 682 | if (status < 0) |
| 683 | return status; |
| 684 | |
| 685 | regval = status & mask; |
| 686 | if (!s1 && !s2) { |
| 687 | ret = !!regval; |
| 688 | } else if (!s1 || !s2) { |
| 689 | BUG(); |
| 690 | return 0; |
| 691 | } else { |
| 692 | long v1, v2; |
| 693 | |
| 694 | if (s1->data < 0) |
| 695 | return s1->data; |
| 696 | if (s2->data < 0) |
| 697 | return s2->data; |
| 698 | |
| 699 | v1 = pmbus_reg2data(data, s1); |
| 700 | v2 = pmbus_reg2data(data, s2); |
| 701 | ret = !!(regval && v1 >= v2); |
| 702 | } |
| 703 | return ret; |
| 704 | } |
| 705 | |
| 706 | static ssize_t pmbus_show_boolean(struct device *dev, |
| 707 | struct device_attribute *da, char *buf) |
| 708 | { |
| 709 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
| 710 | struct pmbus_boolean *boolean = to_pmbus_boolean(attr); |
| 711 | struct pmbus_data *data = pmbus_update_device(dev); |
| 712 | int val; |
| 713 | |
| 714 | val = pmbus_get_boolean(data, boolean, attr->index); |
| 715 | if (val < 0) |
| 716 | return val; |
| 717 | return snprintf(buf, PAGE_SIZE, "%d\n", val); |
| 718 | } |
| 719 | |
| 720 | static ssize_t pmbus_show_sensor(struct device *dev, |
| 721 | struct device_attribute *devattr, char *buf) |
| 722 | { |
| 723 | struct pmbus_data *data = pmbus_update_device(dev); |
| 724 | struct pmbus_sensor *sensor = to_pmbus_sensor(devattr); |
| 725 | |
| 726 | if (sensor->data < 0) |
| 727 | return sensor->data; |
| 728 | |
| 729 | return snprintf(buf, PAGE_SIZE, "%ld\n", pmbus_reg2data(data, sensor)); |
| 730 | } |
| 731 | |
| 732 | static ssize_t pmbus_set_sensor(struct device *dev, |
| 733 | struct device_attribute *devattr, |
| 734 | const char *buf, size_t count) |
| 735 | { |
| 736 | struct i2c_client *client = to_i2c_client(dev); |
| 737 | struct pmbus_data *data = i2c_get_clientdata(client); |
| 738 | struct pmbus_sensor *sensor = to_pmbus_sensor(devattr); |
| 739 | ssize_t rv = count; |
| 740 | long val = 0; |
| 741 | int ret; |
| 742 | u16 regval; |
| 743 | |
| 744 | if (kstrtol(buf, 10, &val) < 0) |
| 745 | return -EINVAL; |
| 746 | |
| 747 | mutex_lock(&data->update_lock); |
| 748 | regval = pmbus_data2reg(data, sensor->class, val); |
| 749 | ret = _pmbus_write_word_data(client, sensor->page, sensor->reg, regval); |
| 750 | if (ret < 0) |
| 751 | rv = ret; |
| 752 | else |
| 753 | sensor->data = regval; |
| 754 | mutex_unlock(&data->update_lock); |
| 755 | return rv; |
| 756 | } |
| 757 | |
| 758 | static ssize_t pmbus_show_label(struct device *dev, |
| 759 | struct device_attribute *da, char *buf) |
| 760 | { |
| 761 | struct pmbus_label *label = to_pmbus_label(da); |
| 762 | |
| 763 | return snprintf(buf, PAGE_SIZE, "%s\n", label->label); |
| 764 | } |
| 765 | |
| 766 | static int pmbus_add_attribute(struct pmbus_data *data, struct attribute *attr) |
| 767 | { |
| 768 | if (data->num_attributes >= data->max_attributes - 1) { |
| 769 | int new_max_attrs = data->max_attributes + PMBUS_ATTR_ALLOC_SIZE; |
| 770 | void *new_attrs = krealloc(data->group.attrs, |
| 771 | new_max_attrs * sizeof(void *), |
| 772 | GFP_KERNEL); |
| 773 | if (!new_attrs) |
| 774 | return -ENOMEM; |
| 775 | data->group.attrs = new_attrs; |
| 776 | data->max_attributes = new_max_attrs; |
| 777 | } |
| 778 | |
| 779 | data->group.attrs[data->num_attributes++] = attr; |
| 780 | data->group.attrs[data->num_attributes] = NULL; |
| 781 | return 0; |
| 782 | } |
| 783 | |
| 784 | static void pmbus_dev_attr_init(struct device_attribute *dev_attr, |
| 785 | const char *name, |
| 786 | umode_t mode, |
| 787 | ssize_t (*show)(struct device *dev, |
| 788 | struct device_attribute *attr, |
| 789 | char *buf), |
| 790 | ssize_t (*store)(struct device *dev, |
| 791 | struct device_attribute *attr, |
| 792 | const char *buf, size_t count)) |
| 793 | { |
| 794 | sysfs_attr_init(&dev_attr->attr); |
| 795 | dev_attr->attr.name = name; |
| 796 | dev_attr->attr.mode = mode; |
| 797 | dev_attr->show = show; |
| 798 | dev_attr->store = store; |
| 799 | } |
| 800 | |
| 801 | static void pmbus_attr_init(struct sensor_device_attribute *a, |
| 802 | const char *name, |
| 803 | umode_t mode, |
| 804 | ssize_t (*show)(struct device *dev, |
| 805 | struct device_attribute *attr, |
| 806 | char *buf), |
| 807 | ssize_t (*store)(struct device *dev, |
| 808 | struct device_attribute *attr, |
| 809 | const char *buf, size_t count), |
| 810 | int idx) |
| 811 | { |
| 812 | pmbus_dev_attr_init(&a->dev_attr, name, mode, show, store); |
| 813 | a->index = idx; |
| 814 | } |
| 815 | |
| 816 | static int pmbus_add_boolean(struct pmbus_data *data, |
| 817 | const char *name, const char *type, int seq, |
| 818 | struct pmbus_sensor *s1, |
| 819 | struct pmbus_sensor *s2, |
| 820 | u16 reg, u8 mask) |
| 821 | { |
| 822 | struct pmbus_boolean *boolean; |
| 823 | struct sensor_device_attribute *a; |
| 824 | |
| 825 | boolean = devm_kzalloc(data->dev, sizeof(*boolean), GFP_KERNEL); |
| 826 | if (!boolean) |
| 827 | return -ENOMEM; |
| 828 | |
| 829 | a = &boolean->attribute; |
| 830 | |
| 831 | snprintf(boolean->name, sizeof(boolean->name), "%s%d_%s", |
| 832 | name, seq, type); |
| 833 | boolean->s1 = s1; |
| 834 | boolean->s2 = s2; |
| 835 | pmbus_attr_init(a, boolean->name, S_IRUGO, pmbus_show_boolean, NULL, |
| 836 | (reg << 8) | mask); |
| 837 | |
| 838 | return pmbus_add_attribute(data, &a->dev_attr.attr); |
| 839 | } |
| 840 | |
| 841 | static struct pmbus_sensor *pmbus_add_sensor(struct pmbus_data *data, |
| 842 | const char *name, const char *type, |
| 843 | int seq, int page, int reg, |
| 844 | enum pmbus_sensor_classes class, |
| 845 | bool update, bool readonly) |
| 846 | { |
| 847 | struct pmbus_sensor *sensor; |
| 848 | struct device_attribute *a; |
| 849 | |
| 850 | sensor = devm_kzalloc(data->dev, sizeof(*sensor), GFP_KERNEL); |
| 851 | if (!sensor) |
| 852 | return NULL; |
| 853 | a = &sensor->attribute; |
| 854 | |
| 855 | snprintf(sensor->name, sizeof(sensor->name), "%s%d_%s", |
| 856 | name, seq, type); |
| 857 | sensor->page = page; |
| 858 | sensor->reg = reg; |
| 859 | sensor->class = class; |
| 860 | sensor->update = update; |
| 861 | pmbus_dev_attr_init(a, sensor->name, |
| 862 | readonly ? S_IRUGO : S_IRUGO | S_IWUSR, |
| 863 | pmbus_show_sensor, pmbus_set_sensor); |
| 864 | |
| 865 | if (pmbus_add_attribute(data, &a->attr)) |
| 866 | return NULL; |
| 867 | |
| 868 | sensor->next = data->sensors; |
| 869 | data->sensors = sensor; |
| 870 | |
| 871 | return sensor; |
| 872 | } |
| 873 | |
| 874 | static int pmbus_add_label(struct pmbus_data *data, |
| 875 | const char *name, int seq, |
| 876 | const char *lstring, int index) |
| 877 | { |
| 878 | struct pmbus_label *label; |
| 879 | struct device_attribute *a; |
| 880 | |
| 881 | label = devm_kzalloc(data->dev, sizeof(*label), GFP_KERNEL); |
| 882 | if (!label) |
| 883 | return -ENOMEM; |
| 884 | |
| 885 | a = &label->attribute; |
| 886 | |
| 887 | snprintf(label->name, sizeof(label->name), "%s%d_label", name, seq); |
| 888 | if (!index) |
| 889 | strncpy(label->label, lstring, sizeof(label->label) - 1); |
| 890 | else |
| 891 | snprintf(label->label, sizeof(label->label), "%s%d", lstring, |
| 892 | index); |
| 893 | |
| 894 | pmbus_dev_attr_init(a, label->name, S_IRUGO, pmbus_show_label, NULL); |
| 895 | return pmbus_add_attribute(data, &a->attr); |
| 896 | } |
| 897 | |
| 898 | /* |
| 899 | * Search for attributes. Allocate sensors, booleans, and labels as needed. |
| 900 | */ |
| 901 | |
| 902 | /* |
| 903 | * The pmbus_limit_attr structure describes a single limit attribute |
| 904 | * and its associated alarm attribute. |
| 905 | */ |
| 906 | struct pmbus_limit_attr { |
| 907 | u16 reg; /* Limit register */ |
| 908 | u16 sbit; /* Alarm attribute status bit */ |
| 909 | bool update; /* True if register needs updates */ |
| 910 | bool low; /* True if low limit; for limits with compare |
| 911 | functions only */ |
| 912 | const char *attr; /* Attribute name */ |
| 913 | const char *alarm; /* Alarm attribute name */ |
| 914 | }; |
| 915 | |
| 916 | /* |
| 917 | * The pmbus_sensor_attr structure describes one sensor attribute. This |
| 918 | * description includes a reference to the associated limit attributes. |
| 919 | */ |
| 920 | struct pmbus_sensor_attr { |
| 921 | u16 reg; /* sensor register */ |
| 922 | u8 gbit; /* generic status bit */ |
| 923 | u8 nlimit; /* # of limit registers */ |
| 924 | enum pmbus_sensor_classes class;/* sensor class */ |
| 925 | const char *label; /* sensor label */ |
| 926 | bool paged; /* true if paged sensor */ |
| 927 | bool update; /* true if update needed */ |
| 928 | bool compare; /* true if compare function needed */ |
| 929 | u32 func; /* sensor mask */ |
| 930 | u32 sfunc; /* sensor status mask */ |
| 931 | int sbase; /* status base register */ |
| 932 | const struct pmbus_limit_attr *limit;/* limit registers */ |
| 933 | }; |
| 934 | |
| 935 | /* |
| 936 | * Add a set of limit attributes and, if supported, the associated |
| 937 | * alarm attributes. |
| 938 | * returns 0 if no alarm register found, 1 if an alarm register was found, |
| 939 | * < 0 on errors. |
| 940 | */ |
| 941 | static int pmbus_add_limit_attrs(struct i2c_client *client, |
| 942 | struct pmbus_data *data, |
| 943 | const struct pmbus_driver_info *info, |
| 944 | const char *name, int index, int page, |
| 945 | struct pmbus_sensor *base, |
| 946 | const struct pmbus_sensor_attr *attr) |
| 947 | { |
| 948 | const struct pmbus_limit_attr *l = attr->limit; |
| 949 | int nlimit = attr->nlimit; |
| 950 | int have_alarm = 0; |
| 951 | int i, ret; |
| 952 | struct pmbus_sensor *curr; |
| 953 | |
| 954 | for (i = 0; i < nlimit; i++) { |
| 955 | if (pmbus_check_word_register(client, page, l->reg)) { |
| 956 | curr = pmbus_add_sensor(data, name, l->attr, index, |
| 957 | page, l->reg, attr->class, |
| 958 | attr->update || l->update, |
| 959 | false); |
| 960 | if (!curr) |
| 961 | return -ENOMEM; |
| 962 | if (l->sbit && (info->func[page] & attr->sfunc)) { |
| 963 | ret = pmbus_add_boolean(data, name, |
| 964 | l->alarm, index, |
| 965 | attr->compare ? l->low ? curr : base |
| 966 | : NULL, |
| 967 | attr->compare ? l->low ? base : curr |
| 968 | : NULL, |
| 969 | attr->sbase + page, l->sbit); |
| 970 | if (ret) |
| 971 | return ret; |
| 972 | have_alarm = 1; |
| 973 | } |
| 974 | } |
| 975 | l++; |
| 976 | } |
| 977 | return have_alarm; |
| 978 | } |
| 979 | |
| 980 | static int pmbus_add_sensor_attrs_one(struct i2c_client *client, |
| 981 | struct pmbus_data *data, |
| 982 | const struct pmbus_driver_info *info, |
| 983 | const char *name, |
| 984 | int index, int page, |
| 985 | const struct pmbus_sensor_attr *attr) |
| 986 | { |
| 987 | struct pmbus_sensor *base; |
| 988 | int ret; |
| 989 | |
| 990 | if (attr->label) { |
| 991 | ret = pmbus_add_label(data, name, index, attr->label, |
| 992 | attr->paged ? page + 1 : 0); |
| 993 | if (ret) |
| 994 | return ret; |
| 995 | } |
| 996 | base = pmbus_add_sensor(data, name, "input", index, page, attr->reg, |
| 997 | attr->class, true, true); |
| 998 | if (!base) |
| 999 | return -ENOMEM; |
| 1000 | if (attr->sfunc) { |
| 1001 | ret = pmbus_add_limit_attrs(client, data, info, name, |
| 1002 | index, page, base, attr); |
| 1003 | if (ret < 0) |
| 1004 | return ret; |
| 1005 | /* |
| 1006 | * Add generic alarm attribute only if there are no individual |
| 1007 | * alarm attributes, if there is a global alarm bit, and if |
| 1008 | * the generic status register for this page is accessible. |
| 1009 | */ |
| 1010 | if (!ret && attr->gbit && |
| 1011 | pmbus_check_byte_register(client, page, |
| 1012 | data->status_register)) { |
| 1013 | ret = pmbus_add_boolean(data, name, "alarm", index, |
| 1014 | NULL, NULL, |
| 1015 | PB_STATUS_BASE + page, |
| 1016 | attr->gbit); |
| 1017 | if (ret) |
| 1018 | return ret; |
| 1019 | } |
| 1020 | } |
| 1021 | return 0; |
| 1022 | } |
| 1023 | |
| 1024 | static int pmbus_add_sensor_attrs(struct i2c_client *client, |
| 1025 | struct pmbus_data *data, |
| 1026 | const char *name, |
| 1027 | const struct pmbus_sensor_attr *attrs, |
| 1028 | int nattrs) |
| 1029 | { |
| 1030 | const struct pmbus_driver_info *info = data->info; |
| 1031 | int index, i; |
| 1032 | int ret; |
| 1033 | |
| 1034 | index = 1; |
| 1035 | for (i = 0; i < nattrs; i++) { |
| 1036 | int page, pages; |
| 1037 | |
| 1038 | pages = attrs->paged ? info->pages : 1; |
| 1039 | for (page = 0; page < pages; page++) { |
| 1040 | if (!(info->func[page] & attrs->func)) |
| 1041 | continue; |
| 1042 | ret = pmbus_add_sensor_attrs_one(client, data, info, |
| 1043 | name, index, page, |
| 1044 | attrs); |
| 1045 | if (ret) |
| 1046 | return ret; |
| 1047 | index++; |
| 1048 | } |
| 1049 | attrs++; |
| 1050 | } |
| 1051 | return 0; |
| 1052 | } |
| 1053 | |
| 1054 | static const struct pmbus_limit_attr vin_limit_attrs[] = { |
| 1055 | { |
| 1056 | .reg = PMBUS_VIN_UV_WARN_LIMIT, |
| 1057 | .attr = "min", |
| 1058 | .alarm = "min_alarm", |
| 1059 | .sbit = PB_VOLTAGE_UV_WARNING, |
| 1060 | }, { |
| 1061 | .reg = PMBUS_VIN_UV_FAULT_LIMIT, |
| 1062 | .attr = "lcrit", |
| 1063 | .alarm = "lcrit_alarm", |
| 1064 | .sbit = PB_VOLTAGE_UV_FAULT, |
| 1065 | }, { |
| 1066 | .reg = PMBUS_VIN_OV_WARN_LIMIT, |
| 1067 | .attr = "max", |
| 1068 | .alarm = "max_alarm", |
| 1069 | .sbit = PB_VOLTAGE_OV_WARNING, |
| 1070 | }, { |
| 1071 | .reg = PMBUS_VIN_OV_FAULT_LIMIT, |
| 1072 | .attr = "crit", |
| 1073 | .alarm = "crit_alarm", |
| 1074 | .sbit = PB_VOLTAGE_OV_FAULT, |
| 1075 | }, { |
| 1076 | .reg = PMBUS_VIRT_READ_VIN_AVG, |
| 1077 | .update = true, |
| 1078 | .attr = "average", |
| 1079 | }, { |
| 1080 | .reg = PMBUS_VIRT_READ_VIN_MIN, |
| 1081 | .update = true, |
| 1082 | .attr = "lowest", |
| 1083 | }, { |
| 1084 | .reg = PMBUS_VIRT_READ_VIN_MAX, |
| 1085 | .update = true, |
| 1086 | .attr = "highest", |
| 1087 | }, { |
| 1088 | .reg = PMBUS_VIRT_RESET_VIN_HISTORY, |
| 1089 | .attr = "reset_history", |
| 1090 | }, |
| 1091 | }; |
| 1092 | |
| 1093 | static const struct pmbus_limit_attr vmon_limit_attrs[] = { |
| 1094 | { |
| 1095 | .reg = PMBUS_VIRT_VMON_UV_WARN_LIMIT, |
| 1096 | .attr = "min", |
| 1097 | .alarm = "min_alarm", |
| 1098 | .sbit = PB_VOLTAGE_UV_WARNING, |
| 1099 | }, { |
| 1100 | .reg = PMBUS_VIRT_VMON_UV_FAULT_LIMIT, |
| 1101 | .attr = "lcrit", |
| 1102 | .alarm = "lcrit_alarm", |
| 1103 | .sbit = PB_VOLTAGE_UV_FAULT, |
| 1104 | }, { |
| 1105 | .reg = PMBUS_VIRT_VMON_OV_WARN_LIMIT, |
| 1106 | .attr = "max", |
| 1107 | .alarm = "max_alarm", |
| 1108 | .sbit = PB_VOLTAGE_OV_WARNING, |
| 1109 | }, { |
| 1110 | .reg = PMBUS_VIRT_VMON_OV_FAULT_LIMIT, |
| 1111 | .attr = "crit", |
| 1112 | .alarm = "crit_alarm", |
| 1113 | .sbit = PB_VOLTAGE_OV_FAULT, |
| 1114 | } |
| 1115 | }; |
| 1116 | |
| 1117 | static const struct pmbus_limit_attr vout_limit_attrs[] = { |
| 1118 | { |
| 1119 | .reg = PMBUS_VOUT_UV_WARN_LIMIT, |
| 1120 | .attr = "min", |
| 1121 | .alarm = "min_alarm", |
| 1122 | .sbit = PB_VOLTAGE_UV_WARNING, |
| 1123 | }, { |
| 1124 | .reg = PMBUS_VOUT_UV_FAULT_LIMIT, |
| 1125 | .attr = "lcrit", |
| 1126 | .alarm = "lcrit_alarm", |
| 1127 | .sbit = PB_VOLTAGE_UV_FAULT, |
| 1128 | }, { |
| 1129 | .reg = PMBUS_VOUT_OV_WARN_LIMIT, |
| 1130 | .attr = "max", |
| 1131 | .alarm = "max_alarm", |
| 1132 | .sbit = PB_VOLTAGE_OV_WARNING, |
| 1133 | }, { |
| 1134 | .reg = PMBUS_VOUT_OV_FAULT_LIMIT, |
| 1135 | .attr = "crit", |
| 1136 | .alarm = "crit_alarm", |
| 1137 | .sbit = PB_VOLTAGE_OV_FAULT, |
| 1138 | }, { |
| 1139 | .reg = PMBUS_VIRT_READ_VOUT_AVG, |
| 1140 | .update = true, |
| 1141 | .attr = "average", |
| 1142 | }, { |
| 1143 | .reg = PMBUS_VIRT_READ_VOUT_MIN, |
| 1144 | .update = true, |
| 1145 | .attr = "lowest", |
| 1146 | }, { |
| 1147 | .reg = PMBUS_VIRT_READ_VOUT_MAX, |
| 1148 | .update = true, |
| 1149 | .attr = "highest", |
| 1150 | }, { |
| 1151 | .reg = PMBUS_VIRT_RESET_VOUT_HISTORY, |
| 1152 | .attr = "reset_history", |
| 1153 | } |
| 1154 | }; |
| 1155 | |
| 1156 | static const struct pmbus_sensor_attr voltage_attributes[] = { |
| 1157 | { |
| 1158 | .reg = PMBUS_READ_VIN, |
| 1159 | .class = PSC_VOLTAGE_IN, |
| 1160 | .label = "vin", |
| 1161 | .func = PMBUS_HAVE_VIN, |
| 1162 | .sfunc = PMBUS_HAVE_STATUS_INPUT, |
| 1163 | .sbase = PB_STATUS_INPUT_BASE, |
| 1164 | .gbit = PB_STATUS_VIN_UV, |
| 1165 | .limit = vin_limit_attrs, |
| 1166 | .nlimit = ARRAY_SIZE(vin_limit_attrs), |
| 1167 | }, { |
| 1168 | .reg = PMBUS_VIRT_READ_VMON, |
| 1169 | .class = PSC_VOLTAGE_IN, |
| 1170 | .label = "vmon", |
| 1171 | .func = PMBUS_HAVE_VMON, |
| 1172 | .sfunc = PMBUS_HAVE_STATUS_VMON, |
| 1173 | .sbase = PB_STATUS_VMON_BASE, |
| 1174 | .limit = vmon_limit_attrs, |
| 1175 | .nlimit = ARRAY_SIZE(vmon_limit_attrs), |
| 1176 | }, { |
| 1177 | .reg = PMBUS_READ_VCAP, |
| 1178 | .class = PSC_VOLTAGE_IN, |
| 1179 | .label = "vcap", |
| 1180 | .func = PMBUS_HAVE_VCAP, |
| 1181 | }, { |
| 1182 | .reg = PMBUS_READ_VOUT, |
| 1183 | .class = PSC_VOLTAGE_OUT, |
| 1184 | .label = "vout", |
| 1185 | .paged = true, |
| 1186 | .func = PMBUS_HAVE_VOUT, |
| 1187 | .sfunc = PMBUS_HAVE_STATUS_VOUT, |
| 1188 | .sbase = PB_STATUS_VOUT_BASE, |
| 1189 | .gbit = PB_STATUS_VOUT_OV, |
| 1190 | .limit = vout_limit_attrs, |
| 1191 | .nlimit = ARRAY_SIZE(vout_limit_attrs), |
| 1192 | } |
| 1193 | }; |
| 1194 | |
| 1195 | /* Current attributes */ |
| 1196 | |
| 1197 | static const struct pmbus_limit_attr iin_limit_attrs[] = { |
| 1198 | { |
| 1199 | .reg = PMBUS_IIN_OC_WARN_LIMIT, |
| 1200 | .attr = "max", |
| 1201 | .alarm = "max_alarm", |
| 1202 | .sbit = PB_IIN_OC_WARNING, |
| 1203 | }, { |
| 1204 | .reg = PMBUS_IIN_OC_FAULT_LIMIT, |
| 1205 | .attr = "crit", |
| 1206 | .alarm = "crit_alarm", |
| 1207 | .sbit = PB_IIN_OC_FAULT, |
| 1208 | }, { |
| 1209 | .reg = PMBUS_VIRT_READ_IIN_AVG, |
| 1210 | .update = true, |
| 1211 | .attr = "average", |
| 1212 | }, { |
| 1213 | .reg = PMBUS_VIRT_READ_IIN_MIN, |
| 1214 | .update = true, |
| 1215 | .attr = "lowest", |
| 1216 | }, { |
| 1217 | .reg = PMBUS_VIRT_READ_IIN_MAX, |
| 1218 | .update = true, |
| 1219 | .attr = "highest", |
| 1220 | }, { |
| 1221 | .reg = PMBUS_VIRT_RESET_IIN_HISTORY, |
| 1222 | .attr = "reset_history", |
| 1223 | } |
| 1224 | }; |
| 1225 | |
| 1226 | static const struct pmbus_limit_attr iout_limit_attrs[] = { |
| 1227 | { |
| 1228 | .reg = PMBUS_IOUT_OC_WARN_LIMIT, |
| 1229 | .attr = "max", |
| 1230 | .alarm = "max_alarm", |
| 1231 | .sbit = PB_IOUT_OC_WARNING, |
| 1232 | }, { |
| 1233 | .reg = PMBUS_IOUT_UC_FAULT_LIMIT, |
| 1234 | .attr = "lcrit", |
| 1235 | .alarm = "lcrit_alarm", |
| 1236 | .sbit = PB_IOUT_UC_FAULT, |
| 1237 | }, { |
| 1238 | .reg = PMBUS_IOUT_OC_FAULT_LIMIT, |
| 1239 | .attr = "crit", |
| 1240 | .alarm = "crit_alarm", |
| 1241 | .sbit = PB_IOUT_OC_FAULT, |
| 1242 | }, { |
| 1243 | .reg = PMBUS_VIRT_READ_IOUT_AVG, |
| 1244 | .update = true, |
| 1245 | .attr = "average", |
| 1246 | }, { |
| 1247 | .reg = PMBUS_VIRT_READ_IOUT_MIN, |
| 1248 | .update = true, |
| 1249 | .attr = "lowest", |
| 1250 | }, { |
| 1251 | .reg = PMBUS_VIRT_READ_IOUT_MAX, |
| 1252 | .update = true, |
| 1253 | .attr = "highest", |
| 1254 | }, { |
| 1255 | .reg = PMBUS_VIRT_RESET_IOUT_HISTORY, |
| 1256 | .attr = "reset_history", |
| 1257 | } |
| 1258 | }; |
| 1259 | |
| 1260 | static const struct pmbus_sensor_attr current_attributes[] = { |
| 1261 | { |
| 1262 | .reg = PMBUS_READ_IIN, |
| 1263 | .class = PSC_CURRENT_IN, |
| 1264 | .label = "iin", |
| 1265 | .func = PMBUS_HAVE_IIN, |
| 1266 | .sfunc = PMBUS_HAVE_STATUS_INPUT, |
| 1267 | .sbase = PB_STATUS_INPUT_BASE, |
| 1268 | .limit = iin_limit_attrs, |
| 1269 | .nlimit = ARRAY_SIZE(iin_limit_attrs), |
| 1270 | }, { |
| 1271 | .reg = PMBUS_READ_IOUT, |
| 1272 | .class = PSC_CURRENT_OUT, |
| 1273 | .label = "iout", |
| 1274 | .paged = true, |
| 1275 | .func = PMBUS_HAVE_IOUT, |
| 1276 | .sfunc = PMBUS_HAVE_STATUS_IOUT, |
| 1277 | .sbase = PB_STATUS_IOUT_BASE, |
| 1278 | .gbit = PB_STATUS_IOUT_OC, |
| 1279 | .limit = iout_limit_attrs, |
| 1280 | .nlimit = ARRAY_SIZE(iout_limit_attrs), |
| 1281 | } |
| 1282 | }; |
| 1283 | |
| 1284 | /* Power attributes */ |
| 1285 | |
| 1286 | static const struct pmbus_limit_attr pin_limit_attrs[] = { |
| 1287 | { |
| 1288 | .reg = PMBUS_PIN_OP_WARN_LIMIT, |
| 1289 | .attr = "max", |
| 1290 | .alarm = "alarm", |
| 1291 | .sbit = PB_PIN_OP_WARNING, |
| 1292 | }, { |
| 1293 | .reg = PMBUS_VIRT_READ_PIN_AVG, |
| 1294 | .update = true, |
| 1295 | .attr = "average", |
| 1296 | }, { |
| 1297 | .reg = PMBUS_VIRT_READ_PIN_MAX, |
| 1298 | .update = true, |
| 1299 | .attr = "input_highest", |
| 1300 | }, { |
| 1301 | .reg = PMBUS_VIRT_RESET_PIN_HISTORY, |
| 1302 | .attr = "reset_history", |
| 1303 | } |
| 1304 | }; |
| 1305 | |
| 1306 | static const struct pmbus_limit_attr pout_limit_attrs[] = { |
| 1307 | { |
| 1308 | .reg = PMBUS_POUT_MAX, |
| 1309 | .attr = "cap", |
| 1310 | .alarm = "cap_alarm", |
| 1311 | .sbit = PB_POWER_LIMITING, |
| 1312 | }, { |
| 1313 | .reg = PMBUS_POUT_OP_WARN_LIMIT, |
| 1314 | .attr = "max", |
| 1315 | .alarm = "max_alarm", |
| 1316 | .sbit = PB_POUT_OP_WARNING, |
| 1317 | }, { |
| 1318 | .reg = PMBUS_POUT_OP_FAULT_LIMIT, |
| 1319 | .attr = "crit", |
| 1320 | .alarm = "crit_alarm", |
| 1321 | .sbit = PB_POUT_OP_FAULT, |
| 1322 | }, { |
| 1323 | .reg = PMBUS_VIRT_READ_POUT_AVG, |
| 1324 | .update = true, |
| 1325 | .attr = "average", |
| 1326 | }, { |
| 1327 | .reg = PMBUS_VIRT_READ_POUT_MAX, |
| 1328 | .update = true, |
| 1329 | .attr = "input_highest", |
| 1330 | }, { |
| 1331 | .reg = PMBUS_VIRT_RESET_POUT_HISTORY, |
| 1332 | .attr = "reset_history", |
| 1333 | } |
| 1334 | }; |
| 1335 | |
| 1336 | static const struct pmbus_sensor_attr power_attributes[] = { |
| 1337 | { |
| 1338 | .reg = PMBUS_READ_PIN, |
| 1339 | .class = PSC_POWER, |
| 1340 | .label = "pin", |
| 1341 | .func = PMBUS_HAVE_PIN, |
| 1342 | .sfunc = PMBUS_HAVE_STATUS_INPUT, |
| 1343 | .sbase = PB_STATUS_INPUT_BASE, |
| 1344 | .limit = pin_limit_attrs, |
| 1345 | .nlimit = ARRAY_SIZE(pin_limit_attrs), |
| 1346 | }, { |
| 1347 | .reg = PMBUS_READ_POUT, |
| 1348 | .class = PSC_POWER, |
| 1349 | .label = "pout", |
| 1350 | .paged = true, |
| 1351 | .func = PMBUS_HAVE_POUT, |
| 1352 | .sfunc = PMBUS_HAVE_STATUS_IOUT, |
| 1353 | .sbase = PB_STATUS_IOUT_BASE, |
| 1354 | .limit = pout_limit_attrs, |
| 1355 | .nlimit = ARRAY_SIZE(pout_limit_attrs), |
| 1356 | } |
| 1357 | }; |
| 1358 | |
| 1359 | /* Temperature atributes */ |
| 1360 | |
| 1361 | static const struct pmbus_limit_attr temp_limit_attrs[] = { |
| 1362 | { |
| 1363 | .reg = PMBUS_UT_WARN_LIMIT, |
| 1364 | .low = true, |
| 1365 | .attr = "min", |
| 1366 | .alarm = "min_alarm", |
| 1367 | .sbit = PB_TEMP_UT_WARNING, |
| 1368 | }, { |
| 1369 | .reg = PMBUS_UT_FAULT_LIMIT, |
| 1370 | .low = true, |
| 1371 | .attr = "lcrit", |
| 1372 | .alarm = "lcrit_alarm", |
| 1373 | .sbit = PB_TEMP_UT_FAULT, |
| 1374 | }, { |
| 1375 | .reg = PMBUS_OT_WARN_LIMIT, |
| 1376 | .attr = "max", |
| 1377 | .alarm = "max_alarm", |
| 1378 | .sbit = PB_TEMP_OT_WARNING, |
| 1379 | }, { |
| 1380 | .reg = PMBUS_OT_FAULT_LIMIT, |
| 1381 | .attr = "crit", |
| 1382 | .alarm = "crit_alarm", |
| 1383 | .sbit = PB_TEMP_OT_FAULT, |
| 1384 | }, { |
| 1385 | .reg = PMBUS_VIRT_READ_TEMP_MIN, |
| 1386 | .attr = "lowest", |
| 1387 | }, { |
| 1388 | .reg = PMBUS_VIRT_READ_TEMP_AVG, |
| 1389 | .attr = "average", |
| 1390 | }, { |
| 1391 | .reg = PMBUS_VIRT_READ_TEMP_MAX, |
| 1392 | .attr = "highest", |
| 1393 | }, { |
| 1394 | .reg = PMBUS_VIRT_RESET_TEMP_HISTORY, |
| 1395 | .attr = "reset_history", |
| 1396 | } |
| 1397 | }; |
| 1398 | |
| 1399 | static const struct pmbus_limit_attr temp_limit_attrs2[] = { |
| 1400 | { |
| 1401 | .reg = PMBUS_UT_WARN_LIMIT, |
| 1402 | .low = true, |
| 1403 | .attr = "min", |
| 1404 | .alarm = "min_alarm", |
| 1405 | .sbit = PB_TEMP_UT_WARNING, |
| 1406 | }, { |
| 1407 | .reg = PMBUS_UT_FAULT_LIMIT, |
| 1408 | .low = true, |
| 1409 | .attr = "lcrit", |
| 1410 | .alarm = "lcrit_alarm", |
| 1411 | .sbit = PB_TEMP_UT_FAULT, |
| 1412 | }, { |
| 1413 | .reg = PMBUS_OT_WARN_LIMIT, |
| 1414 | .attr = "max", |
| 1415 | .alarm = "max_alarm", |
| 1416 | .sbit = PB_TEMP_OT_WARNING, |
| 1417 | }, { |
| 1418 | .reg = PMBUS_OT_FAULT_LIMIT, |
| 1419 | .attr = "crit", |
| 1420 | .alarm = "crit_alarm", |
| 1421 | .sbit = PB_TEMP_OT_FAULT, |
| 1422 | }, { |
| 1423 | .reg = PMBUS_VIRT_READ_TEMP2_MIN, |
| 1424 | .attr = "lowest", |
| 1425 | }, { |
| 1426 | .reg = PMBUS_VIRT_READ_TEMP2_AVG, |
| 1427 | .attr = "average", |
| 1428 | }, { |
| 1429 | .reg = PMBUS_VIRT_READ_TEMP2_MAX, |
| 1430 | .attr = "highest", |
| 1431 | }, { |
| 1432 | .reg = PMBUS_VIRT_RESET_TEMP2_HISTORY, |
| 1433 | .attr = "reset_history", |
| 1434 | } |
| 1435 | }; |
| 1436 | |
| 1437 | static const struct pmbus_limit_attr temp_limit_attrs3[] = { |
| 1438 | { |
| 1439 | .reg = PMBUS_UT_WARN_LIMIT, |
| 1440 | .low = true, |
| 1441 | .attr = "min", |
| 1442 | .alarm = "min_alarm", |
| 1443 | .sbit = PB_TEMP_UT_WARNING, |
| 1444 | }, { |
| 1445 | .reg = PMBUS_UT_FAULT_LIMIT, |
| 1446 | .low = true, |
| 1447 | .attr = "lcrit", |
| 1448 | .alarm = "lcrit_alarm", |
| 1449 | .sbit = PB_TEMP_UT_FAULT, |
| 1450 | }, { |
| 1451 | .reg = PMBUS_OT_WARN_LIMIT, |
| 1452 | .attr = "max", |
| 1453 | .alarm = "max_alarm", |
| 1454 | .sbit = PB_TEMP_OT_WARNING, |
| 1455 | }, { |
| 1456 | .reg = PMBUS_OT_FAULT_LIMIT, |
| 1457 | .attr = "crit", |
| 1458 | .alarm = "crit_alarm", |
| 1459 | .sbit = PB_TEMP_OT_FAULT, |
| 1460 | } |
| 1461 | }; |
| 1462 | |
| 1463 | static const struct pmbus_sensor_attr temp_attributes[] = { |
| 1464 | { |
| 1465 | .reg = PMBUS_READ_TEMPERATURE_1, |
| 1466 | .class = PSC_TEMPERATURE, |
| 1467 | .paged = true, |
| 1468 | .update = true, |
| 1469 | .compare = true, |
| 1470 | .func = PMBUS_HAVE_TEMP, |
| 1471 | .sfunc = PMBUS_HAVE_STATUS_TEMP, |
| 1472 | .sbase = PB_STATUS_TEMP_BASE, |
| 1473 | .gbit = PB_STATUS_TEMPERATURE, |
| 1474 | .limit = temp_limit_attrs, |
| 1475 | .nlimit = ARRAY_SIZE(temp_limit_attrs), |
| 1476 | }, { |
| 1477 | .reg = PMBUS_READ_TEMPERATURE_2, |
| 1478 | .class = PSC_TEMPERATURE, |
| 1479 | .paged = true, |
| 1480 | .update = true, |
| 1481 | .compare = true, |
| 1482 | .func = PMBUS_HAVE_TEMP2, |
| 1483 | .sfunc = PMBUS_HAVE_STATUS_TEMP, |
| 1484 | .sbase = PB_STATUS_TEMP_BASE, |
| 1485 | .gbit = PB_STATUS_TEMPERATURE, |
| 1486 | .limit = temp_limit_attrs2, |
| 1487 | .nlimit = ARRAY_SIZE(temp_limit_attrs2), |
| 1488 | }, { |
| 1489 | .reg = PMBUS_READ_TEMPERATURE_3, |
| 1490 | .class = PSC_TEMPERATURE, |
| 1491 | .paged = true, |
| 1492 | .update = true, |
| 1493 | .compare = true, |
| 1494 | .func = PMBUS_HAVE_TEMP3, |
| 1495 | .sfunc = PMBUS_HAVE_STATUS_TEMP, |
| 1496 | .sbase = PB_STATUS_TEMP_BASE, |
| 1497 | .gbit = PB_STATUS_TEMPERATURE, |
| 1498 | .limit = temp_limit_attrs3, |
| 1499 | .nlimit = ARRAY_SIZE(temp_limit_attrs3), |
| 1500 | } |
| 1501 | }; |
| 1502 | |
| 1503 | static const int pmbus_fan_registers[] = { |
| 1504 | PMBUS_READ_FAN_SPEED_1, |
| 1505 | PMBUS_READ_FAN_SPEED_2, |
| 1506 | PMBUS_READ_FAN_SPEED_3, |
| 1507 | PMBUS_READ_FAN_SPEED_4 |
| 1508 | }; |
| 1509 | |
| 1510 | static const int pmbus_fan_config_registers[] = { |
| 1511 | PMBUS_FAN_CONFIG_12, |
| 1512 | PMBUS_FAN_CONFIG_12, |
| 1513 | PMBUS_FAN_CONFIG_34, |
| 1514 | PMBUS_FAN_CONFIG_34 |
| 1515 | }; |
| 1516 | |
| 1517 | static const int pmbus_fan_status_registers[] = { |
| 1518 | PMBUS_STATUS_FAN_12, |
| 1519 | PMBUS_STATUS_FAN_12, |
| 1520 | PMBUS_STATUS_FAN_34, |
| 1521 | PMBUS_STATUS_FAN_34 |
| 1522 | }; |
| 1523 | |
| 1524 | static const u32 pmbus_fan_flags[] = { |
| 1525 | PMBUS_HAVE_FAN12, |
| 1526 | PMBUS_HAVE_FAN12, |
| 1527 | PMBUS_HAVE_FAN34, |
| 1528 | PMBUS_HAVE_FAN34 |
| 1529 | }; |
| 1530 | |
| 1531 | static const u32 pmbus_fan_status_flags[] = { |
| 1532 | PMBUS_HAVE_STATUS_FAN12, |
| 1533 | PMBUS_HAVE_STATUS_FAN12, |
| 1534 | PMBUS_HAVE_STATUS_FAN34, |
| 1535 | PMBUS_HAVE_STATUS_FAN34 |
| 1536 | }; |
| 1537 | |
| 1538 | /* Fans */ |
| 1539 | static int pmbus_add_fan_attributes(struct i2c_client *client, |
| 1540 | struct pmbus_data *data) |
| 1541 | { |
| 1542 | const struct pmbus_driver_info *info = data->info; |
| 1543 | int index = 1; |
| 1544 | int page; |
| 1545 | int ret; |
| 1546 | |
| 1547 | for (page = 0; page < info->pages; page++) { |
| 1548 | int f; |
| 1549 | |
| 1550 | for (f = 0; f < ARRAY_SIZE(pmbus_fan_registers); f++) { |
| 1551 | int regval; |
| 1552 | |
| 1553 | if (!(info->func[page] & pmbus_fan_flags[f])) |
| 1554 | break; |
| 1555 | |
| 1556 | if (!pmbus_check_word_register(client, page, |
| 1557 | pmbus_fan_registers[f])) |
| 1558 | break; |
| 1559 | |
| 1560 | /* |
| 1561 | * Skip fan if not installed. |
| 1562 | * Each fan configuration register covers multiple fans, |
| 1563 | * so we have to do some magic. |
| 1564 | */ |
| 1565 | regval = _pmbus_read_byte_data(client, page, |
| 1566 | pmbus_fan_config_registers[f]); |
| 1567 | if (regval < 0 || |
| 1568 | (!(regval & (PB_FAN_1_INSTALLED >> ((f & 1) * 4))))) |
| 1569 | continue; |
| 1570 | |
| 1571 | if (pmbus_add_sensor(data, "fan", "input", index, |
| 1572 | page, pmbus_fan_registers[f], |
| 1573 | PSC_FAN, true, true) == NULL) |
| 1574 | return -ENOMEM; |
| 1575 | |
| 1576 | /* |
| 1577 | * Each fan status register covers multiple fans, |
| 1578 | * so we have to do some magic. |
| 1579 | */ |
| 1580 | if ((info->func[page] & pmbus_fan_status_flags[f]) && |
| 1581 | pmbus_check_byte_register(client, |
| 1582 | page, pmbus_fan_status_registers[f])) { |
| 1583 | int base; |
| 1584 | |
| 1585 | if (f > 1) /* fan 3, 4 */ |
| 1586 | base = PB_STATUS_FAN34_BASE + page; |
| 1587 | else |
| 1588 | base = PB_STATUS_FAN_BASE + page; |
| 1589 | ret = pmbus_add_boolean(data, "fan", |
| 1590 | "alarm", index, NULL, NULL, base, |
| 1591 | PB_FAN_FAN1_WARNING >> (f & 1)); |
| 1592 | if (ret) |
| 1593 | return ret; |
| 1594 | ret = pmbus_add_boolean(data, "fan", |
| 1595 | "fault", index, NULL, NULL, base, |
| 1596 | PB_FAN_FAN1_FAULT >> (f & 1)); |
| 1597 | if (ret) |
| 1598 | return ret; |
| 1599 | } |
| 1600 | index++; |
| 1601 | } |
| 1602 | } |
| 1603 | return 0; |
| 1604 | } |
| 1605 | |
| 1606 | static int pmbus_find_attributes(struct i2c_client *client, |
| 1607 | struct pmbus_data *data) |
| 1608 | { |
| 1609 | int ret; |
| 1610 | |
| 1611 | /* Voltage sensors */ |
| 1612 | ret = pmbus_add_sensor_attrs(client, data, "in", voltage_attributes, |
| 1613 | ARRAY_SIZE(voltage_attributes)); |
| 1614 | if (ret) |
| 1615 | return ret; |
| 1616 | |
| 1617 | /* Current sensors */ |
| 1618 | ret = pmbus_add_sensor_attrs(client, data, "curr", current_attributes, |
| 1619 | ARRAY_SIZE(current_attributes)); |
| 1620 | if (ret) |
| 1621 | return ret; |
| 1622 | |
| 1623 | /* Power sensors */ |
| 1624 | ret = pmbus_add_sensor_attrs(client, data, "power", power_attributes, |
| 1625 | ARRAY_SIZE(power_attributes)); |
| 1626 | if (ret) |
| 1627 | return ret; |
| 1628 | |
| 1629 | /* Temperature sensors */ |
| 1630 | ret = pmbus_add_sensor_attrs(client, data, "temp", temp_attributes, |
| 1631 | ARRAY_SIZE(temp_attributes)); |
| 1632 | if (ret) |
| 1633 | return ret; |
| 1634 | |
| 1635 | /* Fans */ |
| 1636 | ret = pmbus_add_fan_attributes(client, data); |
| 1637 | return ret; |
| 1638 | } |
| 1639 | |
| 1640 | /* |
| 1641 | * Identify chip parameters. |
| 1642 | * This function is called for all chips. |
| 1643 | */ |
| 1644 | static int pmbus_identify_common(struct i2c_client *client, |
| 1645 | struct pmbus_data *data) |
| 1646 | { |
| 1647 | int vout_mode = -1; |
| 1648 | |
| 1649 | if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE)) |
| 1650 | vout_mode = _pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE); |
| 1651 | if (vout_mode >= 0 && vout_mode != 0xff) { |
| 1652 | /* |
| 1653 | * Not all chips support the VOUT_MODE command, |
| 1654 | * so a failure to read it is not an error. |
| 1655 | */ |
| 1656 | switch (vout_mode >> 5) { |
| 1657 | case 0: /* linear mode */ |
| 1658 | if (data->info->format[PSC_VOLTAGE_OUT] != linear) |
| 1659 | return -ENODEV; |
| 1660 | |
| 1661 | data->exponent = ((s8)(vout_mode << 3)) >> 3; |
| 1662 | break; |
| 1663 | case 1: /* VID mode */ |
| 1664 | if (data->info->format[PSC_VOLTAGE_OUT] != vid) |
| 1665 | return -ENODEV; |
| 1666 | break; |
| 1667 | case 2: /* direct mode */ |
| 1668 | if (data->info->format[PSC_VOLTAGE_OUT] != direct) |
| 1669 | return -ENODEV; |
| 1670 | break; |
| 1671 | default: |
| 1672 | return -ENODEV; |
| 1673 | } |
| 1674 | } |
| 1675 | |
| 1676 | pmbus_clear_fault_page(client, 0); |
| 1677 | return 0; |
| 1678 | } |
| 1679 | |
| 1680 | static int pmbus_init_common(struct i2c_client *client, struct pmbus_data *data, |
| 1681 | struct pmbus_driver_info *info) |
| 1682 | { |
| 1683 | struct device *dev = &client->dev; |
| 1684 | int ret; |
| 1685 | |
| 1686 | /* |
| 1687 | * Some PMBus chips don't support PMBUS_STATUS_BYTE, so try |
| 1688 | * to use PMBUS_STATUS_WORD instead if that is the case. |
| 1689 | * Bail out if both registers are not supported. |
| 1690 | */ |
| 1691 | data->status_register = PMBUS_STATUS_BYTE; |
| 1692 | ret = i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE); |
| 1693 | if (ret < 0 || ret == 0xff) { |
| 1694 | data->status_register = PMBUS_STATUS_WORD; |
| 1695 | ret = i2c_smbus_read_word_data(client, PMBUS_STATUS_WORD); |
| 1696 | if (ret < 0 || ret == 0xffff) { |
| 1697 | dev_err(dev, "PMBus status register not found\n"); |
| 1698 | return -ENODEV; |
| 1699 | } |
| 1700 | } |
| 1701 | |
| 1702 | pmbus_clear_faults(client); |
| 1703 | |
| 1704 | if (info->identify) { |
| 1705 | ret = (*info->identify)(client, info); |
| 1706 | if (ret < 0) { |
| 1707 | dev_err(dev, "Chip identification failed\n"); |
| 1708 | return ret; |
| 1709 | } |
| 1710 | } |
| 1711 | |
| 1712 | if (info->pages <= 0 || info->pages > PMBUS_PAGES) { |
| 1713 | dev_err(dev, "Bad number of PMBus pages: %d\n", info->pages); |
| 1714 | return -ENODEV; |
| 1715 | } |
| 1716 | |
| 1717 | ret = pmbus_identify_common(client, data); |
| 1718 | if (ret < 0) { |
| 1719 | dev_err(dev, "Failed to identify chip capabilities\n"); |
| 1720 | return ret; |
| 1721 | } |
| 1722 | return 0; |
| 1723 | } |
| 1724 | |
| 1725 | int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id, |
| 1726 | struct pmbus_driver_info *info) |
| 1727 | { |
| 1728 | struct device *dev = &client->dev; |
| 1729 | const struct pmbus_platform_data *pdata = dev->platform_data; |
| 1730 | struct pmbus_data *data; |
| 1731 | int ret; |
| 1732 | |
| 1733 | if (!info) |
| 1734 | return -ENODEV; |
| 1735 | |
| 1736 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE |
| 1737 | | I2C_FUNC_SMBUS_BYTE_DATA |
| 1738 | | I2C_FUNC_SMBUS_WORD_DATA)) |
| 1739 | return -ENODEV; |
| 1740 | |
| 1741 | data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
| 1742 | if (!data) |
| 1743 | return -ENOMEM; |
| 1744 | |
| 1745 | i2c_set_clientdata(client, data); |
| 1746 | mutex_init(&data->update_lock); |
| 1747 | data->dev = dev; |
| 1748 | |
| 1749 | if (pdata) |
| 1750 | data->flags = pdata->flags; |
| 1751 | data->info = info; |
| 1752 | |
| 1753 | ret = pmbus_init_common(client, data, info); |
| 1754 | if (ret < 0) |
| 1755 | return ret; |
| 1756 | |
| 1757 | ret = pmbus_find_attributes(client, data); |
| 1758 | if (ret) |
| 1759 | goto out_kfree; |
| 1760 | |
| 1761 | /* |
| 1762 | * If there are no attributes, something is wrong. |
| 1763 | * Bail out instead of trying to register nothing. |
| 1764 | */ |
| 1765 | if (!data->num_attributes) { |
| 1766 | dev_err(dev, "No attributes found\n"); |
| 1767 | ret = -ENODEV; |
| 1768 | goto out_kfree; |
| 1769 | } |
| 1770 | |
| 1771 | /* Register sysfs hooks */ |
| 1772 | ret = sysfs_create_group(&dev->kobj, &data->group); |
| 1773 | if (ret) { |
| 1774 | dev_err(dev, "Failed to create sysfs entries\n"); |
| 1775 | goto out_kfree; |
| 1776 | } |
| 1777 | data->hwmon_dev = hwmon_device_register(dev); |
| 1778 | if (IS_ERR(data->hwmon_dev)) { |
| 1779 | ret = PTR_ERR(data->hwmon_dev); |
| 1780 | dev_err(dev, "Failed to register hwmon device\n"); |
| 1781 | goto out_hwmon_device_register; |
| 1782 | } |
| 1783 | return 0; |
| 1784 | |
| 1785 | out_hwmon_device_register: |
| 1786 | sysfs_remove_group(&dev->kobj, &data->group); |
| 1787 | out_kfree: |
| 1788 | kfree(data->group.attrs); |
| 1789 | return ret; |
| 1790 | } |
| 1791 | EXPORT_SYMBOL_GPL(pmbus_do_probe); |
| 1792 | |
| 1793 | int pmbus_do_remove(struct i2c_client *client) |
| 1794 | { |
| 1795 | struct pmbus_data *data = i2c_get_clientdata(client); |
| 1796 | hwmon_device_unregister(data->hwmon_dev); |
| 1797 | sysfs_remove_group(&client->dev.kobj, &data->group); |
| 1798 | kfree(data->group.attrs); |
| 1799 | return 0; |
| 1800 | } |
| 1801 | EXPORT_SYMBOL_GPL(pmbus_do_remove); |
| 1802 | |
| 1803 | MODULE_AUTHOR("Guenter Roeck"); |
| 1804 | MODULE_DESCRIPTION("PMBus core driver"); |
| 1805 | MODULE_LICENSE("GPL"); |