1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * HWMON driver for ASUS motherboards that publish some sensor values 4 * via the embedded controller registers. 5 * 6 * Copyright (C) 2021 Eugene Shalygin <eugene.shalygin@gmail.com> 7 8 * EC provides: 9 * - Chipset temperature 10 * - CPU temperature 11 * - Motherboard temperature 12 * - T_Sensor temperature 13 * - VRM temperature 14 * - Water In temperature 15 * - Water Out temperature 16 * - CPU Optional fan RPM 17 * - Chipset fan RPM 18 * - VRM Heat Sink fan RPM 19 * - Water Flow fan RPM 20 * - CPU current 21 * - CPU core voltage 22 */ 23 24 #include <linux/acpi.h> 25 #include <linux/bitops.h> 26 #include <linux/dev_printk.h> 27 #include <linux/dmi.h> 28 #include <linux/hwmon.h> 29 #include <linux/init.h> 30 #include <linux/jiffies.h> 31 #include <linux/kernel.h> 32 #include <linux/module.h> 33 #include <linux/platform_device.h> 34 #include <linux/sort.h> 35 #include <linux/units.h> 36 37 #include <asm/unaligned.h> 38 39 static char *mutex_path_override; 40 41 /* Writing to this EC register switches EC bank */ 42 #define ASUS_EC_BANK_REGISTER 0xff 43 #define SENSOR_LABEL_LEN 16 44 45 /* 46 * Arbitrary set max. allowed bank number. Required for sorting banks and 47 * currently is overkill with just 2 banks used at max, but for the sake 48 * of alignment let's set it to a higher value. 49 */ 50 #define ASUS_EC_MAX_BANK 3 51 52 #define ACPI_LOCK_DELAY_MS 500 53 54 /* ACPI mutex for locking access to the EC for the firmware */ 55 #define ASUS_HW_ACCESS_MUTEX_ASMX "\\AMW0.ASMX" 56 57 /* There are two variants of the vendor spelling */ 58 #define VENDOR_ASUS_UPPER_CASE "ASUSTeK COMPUTER INC." 59 60 typedef union { 61 u32 value; 62 struct { 63 u8 index; 64 u8 bank; 65 u8 size; 66 u8 dummy; 67 } components; 68 } sensor_address; 69 70 #define MAKE_SENSOR_ADDRESS(size, bank, index) { \ 71 .value = (size << 16) + (bank << 8) + index \ 72 } 73 74 static u32 hwmon_attributes[hwmon_max] = { 75 [hwmon_chip] = HWMON_C_REGISTER_TZ, 76 [hwmon_temp] = HWMON_T_INPUT | HWMON_T_LABEL, 77 [hwmon_in] = HWMON_I_INPUT | HWMON_I_LABEL, 78 [hwmon_curr] = HWMON_C_INPUT | HWMON_C_LABEL, 79 [hwmon_fan] = HWMON_F_INPUT | HWMON_F_LABEL, 80 }; 81 82 struct ec_sensor_info { 83 char label[SENSOR_LABEL_LEN]; 84 enum hwmon_sensor_types type; 85 sensor_address addr; 86 }; 87 88 #define EC_SENSOR(sensor_label, sensor_type, size, bank, index) { \ 89 .label = sensor_label, .type = sensor_type, \ 90 .addr = MAKE_SENSOR_ADDRESS(size, bank, index), \ 91 } 92 93 enum ec_sensors { 94 /* chipset temperature [℃] */ 95 ec_sensor_temp_chipset, 96 /* CPU temperature [℃] */ 97 ec_sensor_temp_cpu, 98 /* motherboard temperature [℃] */ 99 ec_sensor_temp_mb, 100 /* "T_Sensor" temperature sensor reading [℃] */ 101 ec_sensor_temp_t_sensor, 102 /* VRM temperature [℃] */ 103 ec_sensor_temp_vrm, 104 /* CPU Core voltage [mV] */ 105 ec_sensor_in_cpu_core, 106 /* CPU_Opt fan [RPM] */ 107 ec_sensor_fan_cpu_opt, 108 /* VRM heat sink fan [RPM] */ 109 ec_sensor_fan_vrm_hs, 110 /* Chipset fan [RPM] */ 111 ec_sensor_fan_chipset, 112 /* Water flow sensor reading [RPM] */ 113 ec_sensor_fan_water_flow, 114 /* CPU current [A] */ 115 ec_sensor_curr_cpu, 116 /* "Water_In" temperature sensor reading [℃] */ 117 ec_sensor_temp_water_in, 118 /* "Water_Out" temperature sensor reading [℃] */ 119 ec_sensor_temp_water_out, 120 }; 121 122 #define SENSOR_TEMP_CHIPSET BIT(ec_sensor_temp_chipset) 123 #define SENSOR_TEMP_CPU BIT(ec_sensor_temp_cpu) 124 #define SENSOR_TEMP_MB BIT(ec_sensor_temp_mb) 125 #define SENSOR_TEMP_T_SENSOR BIT(ec_sensor_temp_t_sensor) 126 #define SENSOR_TEMP_VRM BIT(ec_sensor_temp_vrm) 127 #define SENSOR_IN_CPU_CORE BIT(ec_sensor_in_cpu_core) 128 #define SENSOR_FAN_CPU_OPT BIT(ec_sensor_fan_cpu_opt) 129 #define SENSOR_FAN_VRM_HS BIT(ec_sensor_fan_vrm_hs) 130 #define SENSOR_FAN_CHIPSET BIT(ec_sensor_fan_chipset) 131 #define SENSOR_FAN_WATER_FLOW BIT(ec_sensor_fan_water_flow) 132 #define SENSOR_CURR_CPU BIT(ec_sensor_curr_cpu) 133 #define SENSOR_TEMP_WATER_IN BIT(ec_sensor_temp_water_in) 134 #define SENSOR_TEMP_WATER_OUT BIT(ec_sensor_temp_water_out) 135 136 /* All the known sensors for ASUS EC controllers */ 137 static const struct ec_sensor_info known_ec_sensors[] = { 138 [ec_sensor_temp_chipset] = 139 EC_SENSOR("Chipset", hwmon_temp, 1, 0x00, 0x3a), 140 [ec_sensor_temp_cpu] = EC_SENSOR("CPU", hwmon_temp, 1, 0x00, 0x3b), 141 [ec_sensor_temp_mb] = 142 EC_SENSOR("Motherboard", hwmon_temp, 1, 0x00, 0x3c), 143 [ec_sensor_temp_t_sensor] = 144 EC_SENSOR("T_Sensor", hwmon_temp, 1, 0x00, 0x3d), 145 [ec_sensor_temp_vrm] = EC_SENSOR("VRM", hwmon_temp, 1, 0x00, 0x3e), 146 [ec_sensor_in_cpu_core] = 147 EC_SENSOR("CPU Core", hwmon_in, 2, 0x00, 0xa2), 148 [ec_sensor_fan_cpu_opt] = 149 EC_SENSOR("CPU_Opt", hwmon_fan, 2, 0x00, 0xb0), 150 [ec_sensor_fan_vrm_hs] = EC_SENSOR("VRM HS", hwmon_fan, 2, 0x00, 0xb2), 151 [ec_sensor_fan_chipset] = 152 EC_SENSOR("Chipset", hwmon_fan, 2, 0x00, 0xb4), 153 [ec_sensor_fan_water_flow] = 154 EC_SENSOR("Water_Flow", hwmon_fan, 2, 0x00, 0xbc), 155 [ec_sensor_curr_cpu] = EC_SENSOR("CPU", hwmon_curr, 1, 0x00, 0xf4), 156 [ec_sensor_temp_water_in] = 157 EC_SENSOR("Water_In", hwmon_temp, 1, 0x01, 0x00), 158 [ec_sensor_temp_water_out] = 159 EC_SENSOR("Water_Out", hwmon_temp, 1, 0x01, 0x01), 160 }; 161 162 /* Shortcuts for common combinations */ 163 #define SENSOR_SET_TEMP_CHIPSET_CPU_MB \ 164 (SENSOR_TEMP_CHIPSET | SENSOR_TEMP_CPU | SENSOR_TEMP_MB) 165 #define SENSOR_SET_TEMP_WATER (SENSOR_TEMP_WATER_IN | SENSOR_TEMP_WATER_OUT) 166 167 #define DMI_EXACT_MATCH_BOARD(vendor, name, sensors) { \ 168 .matches = { \ 169 DMI_EXACT_MATCH(DMI_BOARD_VENDOR, vendor), \ 170 DMI_EXACT_MATCH(DMI_BOARD_NAME, name), \ 171 }, \ 172 .driver_data = (void *)(sensors), \ 173 } 174 175 static const struct dmi_system_id asus_ec_dmi_table[] __initconst = { 176 DMI_EXACT_MATCH_BOARD(VENDOR_ASUS_UPPER_CASE, "PRIME X570-PRO", 177 SENSOR_SET_TEMP_CHIPSET_CPU_MB | SENSOR_TEMP_VRM | 178 SENSOR_TEMP_T_SENSOR | SENSOR_FAN_CHIPSET), 179 DMI_EXACT_MATCH_BOARD(VENDOR_ASUS_UPPER_CASE, "Pro WS X570-ACE", 180 SENSOR_SET_TEMP_CHIPSET_CPU_MB | SENSOR_TEMP_VRM | 181 SENSOR_FAN_CHIPSET | SENSOR_CURR_CPU | SENSOR_IN_CPU_CORE), 182 DMI_EXACT_MATCH_BOARD(VENDOR_ASUS_UPPER_CASE, 183 "ROG CROSSHAIR VIII DARK HERO", 184 SENSOR_SET_TEMP_CHIPSET_CPU_MB | SENSOR_TEMP_T_SENSOR | 185 SENSOR_TEMP_VRM | SENSOR_SET_TEMP_WATER | 186 SENSOR_FAN_CPU_OPT | SENSOR_FAN_WATER_FLOW | 187 SENSOR_CURR_CPU | SENSOR_IN_CPU_CORE), 188 DMI_EXACT_MATCH_BOARD(VENDOR_ASUS_UPPER_CASE, 189 "ROG CROSSHAIR VIII FORMULA", 190 SENSOR_SET_TEMP_CHIPSET_CPU_MB | SENSOR_TEMP_T_SENSOR | 191 SENSOR_TEMP_VRM | SENSOR_FAN_CPU_OPT | SENSOR_FAN_CHIPSET | 192 SENSOR_CURR_CPU | SENSOR_IN_CPU_CORE), 193 DMI_EXACT_MATCH_BOARD(VENDOR_ASUS_UPPER_CASE, "ROG CROSSHAIR VIII HERO", 194 SENSOR_SET_TEMP_CHIPSET_CPU_MB | SENSOR_TEMP_T_SENSOR | 195 SENSOR_TEMP_VRM | SENSOR_SET_TEMP_WATER | 196 SENSOR_FAN_CPU_OPT | SENSOR_FAN_CHIPSET | 197 SENSOR_FAN_WATER_FLOW | SENSOR_CURR_CPU | SENSOR_IN_CPU_CORE), 198 DMI_EXACT_MATCH_BOARD(VENDOR_ASUS_UPPER_CASE, 199 "ROG CROSSHAIR VIII HERO (WI-FI)", 200 SENSOR_SET_TEMP_CHIPSET_CPU_MB | SENSOR_TEMP_T_SENSOR | 201 SENSOR_TEMP_VRM | SENSOR_SET_TEMP_WATER | 202 SENSOR_FAN_CPU_OPT | SENSOR_FAN_CHIPSET | 203 SENSOR_FAN_WATER_FLOW | SENSOR_CURR_CPU | SENSOR_IN_CPU_CORE), 204 DMI_EXACT_MATCH_BOARD(VENDOR_ASUS_UPPER_CASE, 205 "ROG CROSSHAIR VIII IMPACT", 206 SENSOR_SET_TEMP_CHIPSET_CPU_MB | SENSOR_TEMP_T_SENSOR | 207 SENSOR_TEMP_VRM | SENSOR_FAN_CHIPSET | 208 SENSOR_CURR_CPU | SENSOR_IN_CPU_CORE), 209 DMI_EXACT_MATCH_BOARD(VENDOR_ASUS_UPPER_CASE, "ROG STRIX B550-E GAMING", 210 SENSOR_SET_TEMP_CHIPSET_CPU_MB | 211 SENSOR_TEMP_T_SENSOR | 212 SENSOR_TEMP_VRM | SENSOR_FAN_CPU_OPT), 213 DMI_EXACT_MATCH_BOARD(VENDOR_ASUS_UPPER_CASE, "ROG STRIX B550-I GAMING", 214 SENSOR_SET_TEMP_CHIPSET_CPU_MB | 215 SENSOR_TEMP_T_SENSOR | 216 SENSOR_TEMP_VRM | SENSOR_FAN_VRM_HS | 217 SENSOR_CURR_CPU | SENSOR_IN_CPU_CORE), 218 DMI_EXACT_MATCH_BOARD(VENDOR_ASUS_UPPER_CASE, "ROG STRIX X570-E GAMING", 219 SENSOR_SET_TEMP_CHIPSET_CPU_MB | 220 SENSOR_TEMP_T_SENSOR | 221 SENSOR_TEMP_VRM | SENSOR_FAN_CHIPSET | 222 SENSOR_CURR_CPU | SENSOR_IN_CPU_CORE), 223 DMI_EXACT_MATCH_BOARD(VENDOR_ASUS_UPPER_CASE, "ROG STRIX X570-F GAMING", 224 SENSOR_SET_TEMP_CHIPSET_CPU_MB | 225 SENSOR_TEMP_T_SENSOR | SENSOR_FAN_CHIPSET), 226 DMI_EXACT_MATCH_BOARD(VENDOR_ASUS_UPPER_CASE, "ROG STRIX X570-I GAMING", 227 SENSOR_TEMP_T_SENSOR | SENSOR_FAN_VRM_HS | 228 SENSOR_FAN_CHIPSET | SENSOR_CURR_CPU | SENSOR_IN_CPU_CORE), 229 {} 230 }; 231 232 struct ec_sensor { 233 unsigned int info_index; 234 s32 cached_value; 235 }; 236 237 struct ec_sensors_data { 238 unsigned long board_sensors; 239 struct ec_sensor *sensors; 240 /* EC registers to read from */ 241 u16 *registers; 242 u8 *read_buffer; 243 /* sorted list of unique register banks */ 244 u8 banks[ASUS_EC_MAX_BANK + 1]; 245 /* in jiffies */ 246 unsigned long last_updated; 247 acpi_handle aml_mutex; 248 /* number of board EC sensors */ 249 u8 nr_sensors; 250 /* 251 * number of EC registers to read 252 * (sensor might span more than 1 register) 253 */ 254 u8 nr_registers; 255 /* number of unique register banks */ 256 u8 nr_banks; 257 }; 258 259 static u8 register_bank(u16 reg) 260 { 261 return reg >> 8; 262 } 263 264 static u8 register_index(u16 reg) 265 { 266 return reg & 0x00ff; 267 } 268 269 static bool is_sensor_data_signed(const struct ec_sensor_info *si) 270 { 271 /* 272 * guessed from WMI functions in DSDT code for boards 273 * of the X470 generation 274 */ 275 return si->type == hwmon_temp; 276 } 277 278 static const struct ec_sensor_info * 279 get_sensor_info(const struct ec_sensors_data *state, int index) 280 { 281 return &known_ec_sensors[state->sensors[index].info_index]; 282 } 283 284 static int find_ec_sensor_index(const struct ec_sensors_data *ec, 285 enum hwmon_sensor_types type, int channel) 286 { 287 unsigned int i; 288 289 for (i = 0; i < ec->nr_sensors; i++) { 290 if (get_sensor_info(ec, i)->type == type) { 291 if (channel == 0) 292 return i; 293 channel--; 294 } 295 } 296 return -ENOENT; 297 } 298 299 static int __init bank_compare(const void *a, const void *b) 300 { 301 return *((const s8 *)a) - *((const s8 *)b); 302 } 303 304 static int __init board_sensors_count(unsigned long sensors) 305 { 306 return hweight_long(sensors); 307 } 308 309 static void __init setup_sensor_data(struct ec_sensors_data *ec) 310 { 311 struct ec_sensor *s = ec->sensors; 312 bool bank_found; 313 int i, j; 314 u8 bank; 315 316 ec->nr_banks = 0; 317 ec->nr_registers = 0; 318 319 for_each_set_bit(i, &ec->board_sensors, 320 BITS_PER_TYPE(ec->board_sensors)) { 321 s->info_index = i; 322 s->cached_value = 0; 323 ec->nr_registers += 324 known_ec_sensors[s->info_index].addr.components.size; 325 bank_found = false; 326 bank = known_ec_sensors[s->info_index].addr.components.bank; 327 for (j = 0; j < ec->nr_banks; j++) { 328 if (ec->banks[j] == bank) { 329 bank_found = true; 330 break; 331 } 332 } 333 if (!bank_found) { 334 ec->banks[ec->nr_banks++] = bank; 335 } 336 s++; 337 } 338 sort(ec->banks, ec->nr_banks, 1, bank_compare, NULL); 339 } 340 341 static void __init fill_ec_registers(struct ec_sensors_data *ec) 342 { 343 const struct ec_sensor_info *si; 344 unsigned int i, j, register_idx = 0; 345 346 for (i = 0; i < ec->nr_sensors; ++i) { 347 si = get_sensor_info(ec, i); 348 for (j = 0; j < si->addr.components.size; ++j, ++register_idx) { 349 ec->registers[register_idx] = 350 (si->addr.components.bank << 8) + 351 si->addr.components.index + j; 352 } 353 } 354 } 355 356 static acpi_handle __init asus_hw_access_mutex(struct device *dev) 357 { 358 const char *mutex_path; 359 acpi_handle res; 360 int status; 361 362 mutex_path = mutex_path_override ? 363 mutex_path_override : ASUS_HW_ACCESS_MUTEX_ASMX; 364 365 status = acpi_get_handle(NULL, (acpi_string)mutex_path, &res); 366 if (ACPI_FAILURE(status)) { 367 dev_err(dev, 368 "Could not get hardware access guard mutex '%s': error %d", 369 mutex_path, status); 370 return NULL; 371 } 372 return res; 373 } 374 375 static int asus_ec_bank_switch(u8 bank, u8 *old) 376 { 377 int status = 0; 378 379 if (old) { 380 status = ec_read(ASUS_EC_BANK_REGISTER, old); 381 } 382 if (status || (old && (*old == bank))) 383 return status; 384 return ec_write(ASUS_EC_BANK_REGISTER, bank); 385 } 386 387 static int asus_ec_block_read(const struct device *dev, 388 struct ec_sensors_data *ec) 389 { 390 int ireg, ibank, status; 391 u8 bank, reg_bank, prev_bank; 392 393 bank = 0; 394 status = asus_ec_bank_switch(bank, &prev_bank); 395 if (status) { 396 dev_warn(dev, "EC bank switch failed"); 397 return status; 398 } 399 400 if (prev_bank) { 401 /* oops... somebody else is working with the EC too */ 402 dev_warn(dev, 403 "Concurrent access to the ACPI EC detected.\nRace condition possible."); 404 } 405 406 /* read registers minimizing bank switches. */ 407 for (ibank = 0; ibank < ec->nr_banks; ibank++) { 408 if (bank != ec->banks[ibank]) { 409 bank = ec->banks[ibank]; 410 if (asus_ec_bank_switch(bank, NULL)) { 411 dev_warn(dev, "EC bank switch to %d failed", 412 bank); 413 break; 414 } 415 } 416 for (ireg = 0; ireg < ec->nr_registers; ireg++) { 417 reg_bank = register_bank(ec->registers[ireg]); 418 if (reg_bank < bank) { 419 continue; 420 } 421 ec_read(register_index(ec->registers[ireg]), 422 ec->read_buffer + ireg); 423 } 424 } 425 426 status = asus_ec_bank_switch(prev_bank, NULL); 427 return status; 428 } 429 430 static inline s32 get_sensor_value(const struct ec_sensor_info *si, u8 *data) 431 { 432 if (is_sensor_data_signed(si)) { 433 switch (si->addr.components.size) { 434 case 1: 435 return (s8)*data; 436 case 2: 437 return (s16)get_unaligned_be16(data); 438 case 4: 439 return (s32)get_unaligned_be32(data); 440 default: 441 return 0; 442 } 443 } else { 444 switch (si->addr.components.size) { 445 case 1: 446 return *data; 447 case 2: 448 return get_unaligned_be16(data); 449 case 4: 450 return get_unaligned_be32(data); 451 default: 452 return 0; 453 } 454 } 455 } 456 457 static void update_sensor_values(struct ec_sensors_data *ec, u8 *data) 458 { 459 const struct ec_sensor_info *si; 460 struct ec_sensor *s; 461 462 for (s = ec->sensors; s != ec->sensors + ec->nr_sensors; s++) { 463 si = &known_ec_sensors[s->info_index]; 464 s->cached_value = get_sensor_value(si, data); 465 data += si->addr.components.size; 466 } 467 } 468 469 static int update_ec_sensors(const struct device *dev, 470 struct ec_sensors_data *ec) 471 { 472 int status; 473 474 /* 475 * ASUS DSDT does not specify that access to the EC has to be guarded, 476 * but firmware does access it via ACPI 477 */ 478 if (ACPI_FAILURE(acpi_acquire_mutex(ec->aml_mutex, NULL, 479 ACPI_LOCK_DELAY_MS))) { 480 dev_err(dev, "Failed to acquire AML mutex"); 481 status = -EBUSY; 482 goto cleanup; 483 } 484 485 status = asus_ec_block_read(dev, ec); 486 487 if (!status) { 488 update_sensor_values(ec, ec->read_buffer); 489 } 490 if (ACPI_FAILURE(acpi_release_mutex(ec->aml_mutex, NULL))) { 491 dev_err(dev, "Failed to release AML mutex"); 492 } 493 cleanup: 494 return status; 495 } 496 497 static long scale_sensor_value(s32 value, int data_type) 498 { 499 switch (data_type) { 500 case hwmon_curr: 501 case hwmon_temp: 502 return value * MILLI; 503 default: 504 return value; 505 } 506 } 507 508 static int get_cached_value_or_update(const struct device *dev, 509 int sensor_index, 510 struct ec_sensors_data *state, s32 *value) 511 { 512 if (time_after(jiffies, state->last_updated + HZ)) { 513 if (update_ec_sensors(dev, state)) { 514 dev_err(dev, "update_ec_sensors() failure\n"); 515 return -EIO; 516 } 517 518 state->last_updated = jiffies; 519 } 520 521 *value = state->sensors[sensor_index].cached_value; 522 return 0; 523 } 524 525 /* 526 * Now follow the functions that implement the hwmon interface 527 */ 528 529 static int asus_ec_hwmon_read(struct device *dev, enum hwmon_sensor_types type, 530 u32 attr, int channel, long *val) 531 { 532 int ret; 533 s32 value = 0; 534 535 struct ec_sensors_data *state = dev_get_drvdata(dev); 536 int sidx = find_ec_sensor_index(state, type, channel); 537 538 if (sidx < 0) { 539 return sidx; 540 } 541 542 ret = get_cached_value_or_update(dev, sidx, state, &value); 543 if (!ret) { 544 *val = scale_sensor_value(value, 545 get_sensor_info(state, sidx)->type); 546 } 547 548 return ret; 549 } 550 551 static int asus_ec_hwmon_read_string(struct device *dev, 552 enum hwmon_sensor_types type, u32 attr, 553 int channel, const char **str) 554 { 555 struct ec_sensors_data *state = dev_get_drvdata(dev); 556 int sensor_index = find_ec_sensor_index(state, type, channel); 557 *str = get_sensor_info(state, sensor_index)->label; 558 559 return 0; 560 } 561 562 static umode_t asus_ec_hwmon_is_visible(const void *drvdata, 563 enum hwmon_sensor_types type, u32 attr, 564 int channel) 565 { 566 const struct ec_sensors_data *state = drvdata; 567 568 return find_ec_sensor_index(state, type, channel) >= 0 ? S_IRUGO : 0; 569 } 570 571 static int __init 572 asus_ec_hwmon_add_chan_info(struct hwmon_channel_info *asus_ec_hwmon_chan, 573 struct device *dev, int num, 574 enum hwmon_sensor_types type, u32 config) 575 { 576 int i; 577 u32 *cfg = devm_kcalloc(dev, num + 1, sizeof(*cfg), GFP_KERNEL); 578 579 if (!cfg) 580 return -ENOMEM; 581 582 asus_ec_hwmon_chan->type = type; 583 asus_ec_hwmon_chan->config = cfg; 584 for (i = 0; i < num; i++, cfg++) 585 *cfg = config; 586 587 return 0; 588 } 589 590 static const struct hwmon_ops asus_ec_hwmon_ops = { 591 .is_visible = asus_ec_hwmon_is_visible, 592 .read = asus_ec_hwmon_read, 593 .read_string = asus_ec_hwmon_read_string, 594 }; 595 596 static struct hwmon_chip_info asus_ec_chip_info = { 597 .ops = &asus_ec_hwmon_ops, 598 }; 599 600 static unsigned long __init get_board_sensors(void) 601 { 602 const struct dmi_system_id *dmi_entry = 603 dmi_first_match(asus_ec_dmi_table); 604 605 return dmi_entry ? (unsigned long)dmi_entry->driver_data : 0; 606 } 607 608 static int __init asus_ec_probe(struct platform_device *pdev) 609 { 610 const struct hwmon_channel_info **ptr_asus_ec_ci; 611 int nr_count[hwmon_max] = { 0 }, nr_types = 0; 612 struct hwmon_channel_info *asus_ec_hwmon_chan; 613 const struct hwmon_chip_info *chip_info; 614 struct device *dev = &pdev->dev; 615 struct ec_sensors_data *ec_data; 616 const struct ec_sensor_info *si; 617 enum hwmon_sensor_types type; 618 unsigned long board_sensors; 619 struct device *hwdev; 620 unsigned int i; 621 622 board_sensors = get_board_sensors(); 623 if (!board_sensors) 624 return -ENODEV; 625 626 ec_data = devm_kzalloc(dev, sizeof(struct ec_sensors_data), 627 GFP_KERNEL); 628 if (!ec_data) 629 return -ENOMEM; 630 631 dev_set_drvdata(dev, ec_data); 632 ec_data->board_sensors = board_sensors; 633 ec_data->nr_sensors = board_sensors_count(ec_data->board_sensors); 634 ec_data->sensors = devm_kcalloc(dev, ec_data->nr_sensors, 635 sizeof(struct ec_sensor), GFP_KERNEL); 636 637 setup_sensor_data(ec_data); 638 ec_data->registers = devm_kcalloc(dev, ec_data->nr_registers, 639 sizeof(u16), GFP_KERNEL); 640 ec_data->read_buffer = devm_kcalloc(dev, ec_data->nr_registers, 641 sizeof(u8), GFP_KERNEL); 642 643 if (!ec_data->registers || !ec_data->read_buffer) 644 return -ENOMEM; 645 646 fill_ec_registers(ec_data); 647 648 ec_data->aml_mutex = asus_hw_access_mutex(dev); 649 650 for (i = 0; i < ec_data->nr_sensors; ++i) { 651 si = get_sensor_info(ec_data, i); 652 if (!nr_count[si->type]) 653 ++nr_types; 654 ++nr_count[si->type]; 655 } 656 657 if (nr_count[hwmon_temp]) 658 nr_count[hwmon_chip]++, nr_types++; 659 660 asus_ec_hwmon_chan = devm_kcalloc( 661 dev, nr_types, sizeof(*asus_ec_hwmon_chan), GFP_KERNEL); 662 if (!asus_ec_hwmon_chan) 663 return -ENOMEM; 664 665 ptr_asus_ec_ci = devm_kcalloc(dev, nr_types + 1, 666 sizeof(*ptr_asus_ec_ci), GFP_KERNEL); 667 if (!ptr_asus_ec_ci) 668 return -ENOMEM; 669 670 asus_ec_chip_info.info = ptr_asus_ec_ci; 671 chip_info = &asus_ec_chip_info; 672 673 for (type = 0; type < hwmon_max; ++type) { 674 if (!nr_count[type]) 675 continue; 676 677 asus_ec_hwmon_add_chan_info(asus_ec_hwmon_chan, dev, 678 nr_count[type], type, 679 hwmon_attributes[type]); 680 *ptr_asus_ec_ci++ = asus_ec_hwmon_chan++; 681 } 682 683 dev_info(dev, "board has %d EC sensors that span %d registers", 684 ec_data->nr_sensors, ec_data->nr_registers); 685 686 hwdev = devm_hwmon_device_register_with_info(dev, "asusec", 687 ec_data, chip_info, NULL); 688 689 return PTR_ERR_OR_ZERO(hwdev); 690 } 691 692 693 static const struct acpi_device_id acpi_ec_ids[] = { 694 /* Embedded Controller Device */ 695 { "PNP0C09", 0 }, 696 {} 697 }; 698 699 static struct platform_driver asus_ec_sensors_platform_driver = { 700 .driver = { 701 .name = "asus-ec-sensors", 702 .acpi_match_table = acpi_ec_ids, 703 }, 704 }; 705 706 MODULE_DEVICE_TABLE(dmi, asus_ec_dmi_table); 707 module_platform_driver_probe(asus_ec_sensors_platform_driver, asus_ec_probe); 708 709 module_param_named(mutex_path, mutex_path_override, charp, 0); 710 MODULE_PARM_DESC(mutex_path, 711 "Override ACPI mutex path used to guard access to hardware"); 712 713 MODULE_AUTHOR("Eugene Shalygin <eugene.shalygin@gmail.com>"); 714 MODULE_DESCRIPTION( 715 "HWMON driver for sensors accessible via ACPI EC in ASUS motherboards"); 716 MODULE_LICENSE("GPL"); 717