drivers/hwmon/asus_wmi_ec_sensors.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * HWMON driver for ASUS B550/X570 motherboards that publish sensor
   4  * values via the embedded controller registers.
   5  *
   6  * Copyright (C) 2021 Eugene Shalygin <eugene.shalygin@gmail.com>
   7  * Copyright (C) 2018-2019 Ed Brindley <kernel@maidavale.org>
   8  *
   9  * EC provides:
  10  * - Chipset temperature
  11  * - CPU temperature
  12  * - Motherboard temperature
  13  * - T_Sensor temperature
  14  * - VRM temperature
  15  * - Water In temperature
  16  * - Water Out temperature
  17  * - CPU Optional Fan RPM
  18  * - Chipset Fan RPM
  19  * - Water Flow Fan RPM
  20  * - CPU current
  21  */
  22
  23 #include <linux/acpi.h>
  24 #include <linux/dmi.h>
  25 #include <linux/hwmon.h>
  26 #include <linux/init.h>
  27 #include <linux/jiffies.h>
  28 #include <linux/kernel.h>
  29 #include <linux/module.h>
  30 #include <linux/mutex.h>
  31 #include <linux/nls.h>
  32 #include <linux/units.h>
  33 #include <linux/wmi.h>
  34
  35 #include <asm/unaligned.h>
  36
  37 #define ASUSWMI_MONITORING_GUID         "466747A0-70EC-11DE-8A39-0800200C9A66"
  38 #define ASUSWMI_METHODID_BLOCK_READ_EC  0x42524543 /* BREC */
  39 /* From the ASUS DSDT source */
  40 #define ASUSWMI_BREC_REGISTERS_MAX      16
  41 #define ASUSWMI_MAX_BUF_LEN             128
  42 #define SENSOR_LABEL_LEN                16
  43
  44 static u32 hwmon_attributes[hwmon_max] = {
  45         [hwmon_chip]    = HWMON_C_REGISTER_TZ,
  46         [hwmon_temp]    = HWMON_T_INPUT | HWMON_T_LABEL,
  47         [hwmon_in]      = HWMON_I_INPUT | HWMON_I_LABEL,
  48         [hwmon_curr]    = HWMON_C_INPUT | HWMON_C_LABEL,
  49         [hwmon_fan]     = HWMON_F_INPUT | HWMON_F_LABEL,
  50 };
  51
  52 struct asus_wmi_ec_sensor_address {
  53         u8 index;
  54         u8 bank;
  55         u8 size;
  56 };
  57
  58 #define MAKE_SENSOR_ADDRESS(size_i, bank_i, index_i) {  \
  59         .size = size_i,                                 \
  60         .bank = bank_i,                                 \
  61         .index = index_i,                               \
  62 }
  63
  64 struct ec_sensor_info {
  65         struct asus_wmi_ec_sensor_address addr;
  66         char label[SENSOR_LABEL_LEN];
  67         enum hwmon_sensor_types type;
  68 };
  69
  70 #define EC_SENSOR(sensor_label, sensor_type, size, bank, index) {       \
  71         .addr = MAKE_SENSOR_ADDRESS(size, bank, index),                 \
  72         .label = sensor_label,                                          \
  73         .type = sensor_type,                                            \
  74 }
  75
  76 enum known_ec_sensor {
  77         SENSOR_TEMP_CHIPSET,
  78         SENSOR_TEMP_CPU,
  79         SENSOR_TEMP_MB,
  80         SENSOR_TEMP_T_SENSOR,
  81         SENSOR_TEMP_VRM,
  82         SENSOR_FAN_CPU_OPT,
  83         SENSOR_FAN_CHIPSET,
  84         SENSOR_FAN_VRM_HS,
  85         SENSOR_FAN_WATER_FLOW,
  86         SENSOR_CURR_CPU,
  87         SENSOR_TEMP_WATER_IN,
  88         SENSOR_TEMP_WATER_OUT,
  89         SENSOR_MAX
  90 };
  91
  92 /* All known sensors for ASUS EC controllers */
  93 static const struct ec_sensor_info known_ec_sensors[] = {
  94         [SENSOR_TEMP_CHIPSET]   = EC_SENSOR("Chipset", hwmon_temp, 1, 0x00, 0x3a),
  95         [SENSOR_TEMP_CPU]       = EC_SENSOR("CPU", hwmon_temp, 1, 0x00, 0x3b),
  96         [SENSOR_TEMP_MB]        = EC_SENSOR("Motherboard", hwmon_temp, 1, 0x00, 0x3c),
  97         [SENSOR_TEMP_T_SENSOR]  = EC_SENSOR("T_Sensor", hwmon_temp, 1, 0x00, 0x3d),
  98         [SENSOR_TEMP_VRM]       = EC_SENSOR("VRM", hwmon_temp, 1, 0x00, 0x3e),
  99         [SENSOR_FAN_CPU_OPT]    = EC_SENSOR("CPU_Opt", hwmon_fan, 2, 0x00, 0xb0),
 100         [SENSOR_FAN_VRM_HS]     = EC_SENSOR("VRM HS", hwmon_fan, 2, 0x00, 0xb2),
 101         [SENSOR_FAN_CHIPSET]    = EC_SENSOR("Chipset", hwmon_fan, 2, 0x00, 0xb4),
 102         [SENSOR_FAN_WATER_FLOW] = EC_SENSOR("Water_Flow", hwmon_fan, 2, 0x00, 0xbc),
 103         [SENSOR_CURR_CPU]       = EC_SENSOR("CPU", hwmon_curr, 1, 0x00, 0xf4),
 104         [SENSOR_TEMP_WATER_IN]  = EC_SENSOR("Water_In", hwmon_temp, 1, 0x01, 0x00),
 105         [SENSOR_TEMP_WATER_OUT] = EC_SENSOR("Water_Out", hwmon_temp, 1, 0x01, 0x01),
 106 };
 107
 108 struct asus_wmi_data {
 109         const enum known_ec_sensor known_board_sensors[SENSOR_MAX + 1];
 110 };
 111
 112 /* boards with EC support */
 113 static struct asus_wmi_data sensors_board_PW_X570_P = {
 114         .known_board_sensors = {
 115                 SENSOR_TEMP_CHIPSET, SENSOR_TEMP_CPU, SENSOR_TEMP_MB,
 116                 SENSOR_TEMP_T_SENSOR, SENSOR_TEMP_VRM,
 117                 SENSOR_FAN_CHIPSET,
 118                 SENSOR_MAX
 119         },
 120 };
 121
 122 static struct asus_wmi_data sensors_board_PW_X570_A = {
 123         .known_board_sensors = {
 124                 SENSOR_TEMP_CHIPSET, SENSOR_TEMP_CPU, SENSOR_TEMP_MB, SENSOR_TEMP_VRM,
 125                 SENSOR_FAN_CHIPSET,
 126                 SENSOR_CURR_CPU,
 127                 SENSOR_MAX
 128         },
 129 };
 130
 131 static struct asus_wmi_data sensors_board_R_C8H = {
 132         .known_board_sensors = {
 133                 SENSOR_TEMP_CHIPSET, SENSOR_TEMP_CPU, SENSOR_TEMP_MB,
 134                 SENSOR_TEMP_T_SENSOR, SENSOR_TEMP_VRM,
 135                 SENSOR_TEMP_WATER_IN, SENSOR_TEMP_WATER_OUT,
 136                 SENSOR_FAN_CPU_OPT, SENSOR_FAN_CHIPSET, SENSOR_FAN_WATER_FLOW,
 137                 SENSOR_CURR_CPU,
 138                 SENSOR_MAX
 139         },
 140 };
 141
 142 /* Same as Hero but without chipset fan */
 143 static struct asus_wmi_data sensors_board_R_C8DH = {
 144         .known_board_sensors = {
 145                 SENSOR_TEMP_CHIPSET, SENSOR_TEMP_CPU, SENSOR_TEMP_MB,
 146                 SENSOR_TEMP_T_SENSOR, SENSOR_TEMP_VRM,
 147                 SENSOR_TEMP_WATER_IN, SENSOR_TEMP_WATER_OUT,
 148                 SENSOR_FAN_CPU_OPT, SENSOR_FAN_WATER_FLOW,
 149                 SENSOR_CURR_CPU,
 150                 SENSOR_MAX
 151         },
 152 };
 153
 154 /* Same as Hero but without water */
 155 static struct asus_wmi_data sensors_board_R_C8F = {
 156         .known_board_sensors = {
 157                 SENSOR_TEMP_CHIPSET, SENSOR_TEMP_CPU, SENSOR_TEMP_MB,
 158                 SENSOR_TEMP_T_SENSOR, SENSOR_TEMP_VRM,
 159                 SENSOR_FAN_CPU_OPT, SENSOR_FAN_CHIPSET,
 160                 SENSOR_CURR_CPU,
 161                 SENSOR_MAX
 162         },
 163 };
 164
 165 static struct asus_wmi_data sensors_board_RS_B550_E_G = {
 166         .known_board_sensors = {
 167                 SENSOR_TEMP_CHIPSET, SENSOR_TEMP_CPU, SENSOR_TEMP_MB,
 168                 SENSOR_TEMP_T_SENSOR, SENSOR_TEMP_VRM,
 169                 SENSOR_FAN_CPU_OPT,
 170                 SENSOR_MAX
 171         },
 172 };
 173
 174 static struct asus_wmi_data sensors_board_RS_B550_I_G = {
 175         .known_board_sensors = {
 176                 SENSOR_TEMP_CHIPSET, SENSOR_TEMP_CPU, SENSOR_TEMP_MB,
 177                 SENSOR_TEMP_T_SENSOR, SENSOR_TEMP_VRM,
 178                 SENSOR_FAN_VRM_HS,
 179                 SENSOR_CURR_CPU,
 180                 SENSOR_MAX
 181         },
 182 };
 183
 184 static struct asus_wmi_data sensors_board_RS_X570_E_G = {
 185         .known_board_sensors = {
 186                 SENSOR_TEMP_CHIPSET, SENSOR_TEMP_CPU, SENSOR_TEMP_MB,
 187                 SENSOR_TEMP_T_SENSOR, SENSOR_TEMP_VRM,
 188                 SENSOR_FAN_CHIPSET,
 189                 SENSOR_CURR_CPU,
 190                 SENSOR_MAX
 191         },
 192 };
 193
 194 #define DMI_EXACT_MATCH_ASUS_BOARD_NAME(name, sensors) {                        \
 195         .matches = {                                                            \
 196                 DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "ASUSTeK COMPUTER INC."),     \
 197                 DMI_EXACT_MATCH(DMI_BOARD_NAME, name),                          \
 198         },                                                                      \
 199         .driver_data = sensors,                                                 \
 200 }
 201
 202 static const struct dmi_system_id asus_wmi_ec_dmi_table[] = {
 203         DMI_EXACT_MATCH_ASUS_BOARD_NAME("PRIME X570-PRO", &sensors_board_PW_X570_P),
 204         DMI_EXACT_MATCH_ASUS_BOARD_NAME("Pro WS X570-ACE", &sensors_board_PW_X570_A),
 205         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VIII DARK HERO", &sensors_board_R_C8DH),
 206         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VIII FORMULA", &sensors_board_R_C8F),
 207         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VIII HERO", &sensors_board_R_C8H),
 208         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX B550-E GAMING", &sensors_board_RS_B550_E_G),
 209         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX B550-I GAMING", &sensors_board_RS_B550_I_G),
 210         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX X570-E GAMING", &sensors_board_RS_X570_E_G),
 211         {}
 212 };
 213 MODULE_DEVICE_TABLE(dmi, asus_wmi_ec_dmi_table);
 214
 215 struct ec_sensor {
 216         enum known_ec_sensor info_index;
 217         long cached_value;
 218 };
 219
 220 /**
 221  * struct asus_wmi_ec_info - sensor info.
 222  * @sensors: list of sensors.
 223  * @read_arg: UTF-16LE string to pass to BRxx() WMI function.
 224  * @read_buffer: decoded output from WMI result.
 225  * @nr_sensors: number of board EC sensors.
 226  * @nr_registers: number of EC registers to read (sensor might span more than 1 register).
 227  * @last_updated: in jiffies.
 228  */
 229 struct asus_wmi_ec_info {
 230         struct ec_sensor sensors[SENSOR_MAX];
 231         char read_arg[(ASUSWMI_BREC_REGISTERS_MAX * 4 + 1) * 2];
 232         u8 read_buffer[ASUSWMI_BREC_REGISTERS_MAX];
 233         unsigned int nr_sensors;
 234         unsigned int nr_registers;
 235         unsigned long last_updated;
 236 };
 237
 238 struct asus_wmi_sensors {
 239         struct asus_wmi_ec_info ec;
 240         /* lock access to internal cache */
 241         struct mutex lock;
 242 };
 243
 244 static int asus_wmi_ec_fill_board_sensors(struct asus_wmi_ec_info *ec,
 245                                           const enum known_ec_sensor *bsi)
 246 {
 247         struct ec_sensor *s = ec->sensors;
 248         int i;
 249
 250         ec->nr_sensors = 0;
 251         ec->nr_registers = 0;
 252
 253         for (i = 0; bsi[i] != SENSOR_MAX; i++) {
 254                 s[i].info_index = bsi[i];
 255                 ec->nr_sensors++;
 256                 ec->nr_registers += known_ec_sensors[bsi[i]].addr.size;
 257         }
 258
 259         return 0;
 260 }
 261
 262 /*
 263  * The next four functions convert to or from BRxx string argument format.
 264  * The format of the string is as follows:
 265  * - The string consists of two-byte UTF-16LE characters.
 266  * - The value of the very first byte in the string is equal to the total
 267  *   length of the next string in bytes, thus excluding the first two-byte
 268  *   character.
 269  * - The rest of the string encodes the pairs of (bank, index) pairs, where
 270  *   both values are byte-long (0x00 to 0xFF).
 271  * - Numbers are encoded as UTF-16LE hex values.
 272  */
 273 static int asus_wmi_ec_decode_reply_buffer(const u8 *in, u32 length, u8 *out)
 274 {
 275         char buffer[ASUSWMI_MAX_BUF_LEN * 2];
 276         u32 len = min_t(u32, get_unaligned_le16(in), length - 2);
 277
 278         utf16s_to_utf8s((wchar_t *)(in + 2), len / 2, UTF16_LITTLE_ENDIAN, buffer, sizeof(buffer));
 279
 280         return hex2bin(out, buffer, len / 4);
 281 }
 282
 283 static void asus_wmi_ec_encode_registers(const u8 *in, u32 len, char *out)
 284 {
 285         char buffer[ASUSWMI_MAX_BUF_LEN * 2];
 286
 287         bin2hex(buffer, in, len);
 288
 289         utf8s_to_utf16s(buffer, len * 2, UTF16_LITTLE_ENDIAN, (wchar_t *)(out + 2), len * 2);
 290
 291         put_unaligned_le16(len * 4, out);
 292 }
 293
 294 static void asus_wmi_ec_make_block_read_query(struct asus_wmi_ec_info *ec)
 295 {
 296         u8 registers[ASUSWMI_BREC_REGISTERS_MAX * 2];
 297         const struct ec_sensor_info *si;
 298         int i, j, offset;
 299
 300         offset = 0;
 301         for (i = 0; i < ec->nr_sensors; i++) {
 302                 si = &known_ec_sensors[ec->sensors[i].info_index];
 303                 for (j = 0; j < si->addr.size; j++) {
 304                         registers[offset++] = si->addr.bank;
 305                         registers[offset++] = si->addr.index + j;
 306                 }
 307         }
 308
 309         asus_wmi_ec_encode_registers(registers, offset, ec->read_arg);
 310 }
 311
 312 static int asus_wmi_ec_block_read(u32 method_id, char *query, u8 *out)
 313 {
 314         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 315         struct acpi_buffer input;
 316         union acpi_object *obj;
 317         acpi_status status;
 318         int ret;
 319
 320         /* The first byte of the BRxx() argument string has to be the string size. */
 321         input.length = query[0] + 2;
 322         input.pointer = query;
 323         status = wmi_evaluate_method(ASUSWMI_MONITORING_GUID, 0, method_id, &input, &output);
 324         if (ACPI_FAILURE(status))
 325                 return -EIO;
 326
 327         obj = output.pointer;
 328         if (!obj)
 329                 return -EIO;
 330
 331         if (obj->type != ACPI_TYPE_BUFFER || obj->buffer.length < 2) {
 332                 ret = -EIO;
 333                 goto out_free_obj;
 334         }
 335
 336         ret = asus_wmi_ec_decode_reply_buffer(obj->buffer.pointer, obj->buffer.length, out);
 337
 338 out_free_obj:
 339         ACPI_FREE(obj);
 340         return ret;
 341 }
 342
 343 static inline long get_sensor_value(const struct ec_sensor_info *si, u8 *data)
 344 {
 345         switch (si->addr.size) {
 346         case 1:
 347                 return *data;
 348         case 2:
 349                 return get_unaligned_be16(data);
 350         case 4:
 351                 return get_unaligned_be32(data);
 352         default:
 353                 return 0;
 354         }
 355 }
 356
 357 static void asus_wmi_ec_update_ec_sensors(struct asus_wmi_ec_info *ec)
 358 {
 359         const struct ec_sensor_info *si;
 360         struct ec_sensor *s;
 361         u8 i_sensor;
 362         u8 *data;
 363
 364         data = ec->read_buffer;
 365         for (i_sensor = 0; i_sensor < ec->nr_sensors; i_sensor++) {
 366                 s = &ec->sensors[i_sensor];
 367                 si = &known_ec_sensors[s->info_index];
 368                 s->cached_value = get_sensor_value(si, data);
 369                 data += si->addr.size;
 370         }
 371 }
 372
 373 static long asus_wmi_ec_scale_sensor_value(long value, int data_type)
 374 {
 375         switch (data_type) {
 376         case hwmon_curr:
 377         case hwmon_temp:
 378         case hwmon_in:
 379                 return value * MILLI;
 380         default:
 381                 return value;
 382         }
 383 }
 384
 385 static int asus_wmi_ec_find_sensor_index(const struct asus_wmi_ec_info *ec,
 386                                          enum hwmon_sensor_types type, int channel)
 387 {
 388         int i;
 389
 390         for (i = 0; i < ec->nr_sensors; i++) {
 391                 if (known_ec_sensors[ec->sensors[i].info_index].type == type) {
 392                         if (channel == 0)
 393                                 return i;
 394
 395                         channel--;
 396                 }
 397         }
 398         return -EINVAL;
 399 }
 400
 401 static int asus_wmi_ec_get_cached_value_or_update(struct asus_wmi_sensors *sensor_data,
 402                                                   int sensor_index,
 403                                                   long *value)
 404 {
 405         struct asus_wmi_ec_info *ec = &sensor_data->ec;
 406         int ret = 0;
 407
 408         mutex_lock(&sensor_data->lock);
 409
 410         if (time_after(jiffies, ec->last_updated + HZ)) {
 411                 ret = asus_wmi_ec_block_read(ASUSWMI_METHODID_BLOCK_READ_EC,
 412                                              ec->read_arg, ec->read_buffer);
 413                 if (ret)
 414                         goto unlock;
 415
 416                 asus_wmi_ec_update_ec_sensors(ec);
 417                 ec->last_updated = jiffies;
 418         }
 419
 420         *value = ec->sensors[sensor_index].cached_value;
 421
 422 unlock:
 423         mutex_unlock(&sensor_data->lock);
 424
 425         return ret;
 426 }
 427
 428 /* Now follow the functions that implement the hwmon interface */
 429
 430 static int asus_wmi_ec_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
 431                                   u32 attr, int channel, long *val)
 432 {
 433         struct asus_wmi_sensors *sensor_data = dev_get_drvdata(dev);
 434         struct asus_wmi_ec_info *ec = &sensor_data->ec;
 435         int ret, sidx, info_index;
 436         long value = 0;
 437
 438         sidx = asus_wmi_ec_find_sensor_index(ec, type, channel);
 439         if (sidx < 0)
 440                 return sidx;
 441
 442         ret = asus_wmi_ec_get_cached_value_or_update(sensor_data, sidx, &value);
 443         if (ret)
 444                 return ret;
 445
 446         info_index = ec->sensors[sidx].info_index;
 447         *val = asus_wmi_ec_scale_sensor_value(value, known_ec_sensors[info_index].type);
 448
 449         return ret;
 450 }
 451
 452 static int asus_wmi_ec_hwmon_read_string(struct device *dev,
 453                                          enum hwmon_sensor_types type, u32 attr,
 454                                          int channel, const char **str)
 455 {
 456         struct asus_wmi_sensors *sensor_data = dev_get_drvdata(dev);
 457         struct asus_wmi_ec_info *ec = &sensor_data->ec;
 458         int sensor_index;
 459
 460         sensor_index = asus_wmi_ec_find_sensor_index(ec, type, channel);
 461         *str = known_ec_sensors[ec->sensors[sensor_index].info_index].label;
 462
 463         return 0;
 464 }
 465
 466 static umode_t asus_wmi_ec_hwmon_is_visible(const void *drvdata,
 467                                             enum hwmon_sensor_types type, u32 attr,
 468                                             int channel)
 469 {
 470         const struct asus_wmi_sensors *sensor_data = drvdata;
 471         const struct asus_wmi_ec_info *ec = &sensor_data->ec;
 472         int index;
 473
 474         index = asus_wmi_ec_find_sensor_index(ec, type, channel);
 475
 476         return index < 0 ? 0 : 0444;
 477 }
 478
 479 static int asus_wmi_hwmon_add_chan_info(struct hwmon_channel_info *asus_wmi_hwmon_chan,
 480                                         struct device *dev, int num,
 481                                         enum hwmon_sensor_types type, u32 config)
 482 {
 483         u32 *cfg;
 484
 485         cfg = devm_kcalloc(dev, num + 1, sizeof(*cfg), GFP_KERNEL);
 486         if (!cfg)
 487                 return -ENOMEM;
 488
 489         asus_wmi_hwmon_chan->type = type;
 490         asus_wmi_hwmon_chan->config = cfg;
 491         memset32(cfg, config, num);
 492
 493         return 0;
 494 }
 495
 496 static const struct hwmon_ops asus_wmi_ec_hwmon_ops = {
 497         .is_visible = asus_wmi_ec_hwmon_is_visible,
 498         .read = asus_wmi_ec_hwmon_read,
 499         .read_string = asus_wmi_ec_hwmon_read_string,
 500 };
 501
 502 static struct hwmon_chip_info asus_wmi_ec_chip_info = {
 503         .ops = &asus_wmi_ec_hwmon_ops,
 504 };
 505
 506 static int asus_wmi_ec_configure_sensor_setup(struct device *dev,
 507                                               const enum known_ec_sensor *bsi)
 508 {
 509         struct asus_wmi_sensors *sensor_data = dev_get_drvdata(dev);
 510         struct asus_wmi_ec_info *ec = &sensor_data->ec;
 511         struct hwmon_channel_info *asus_wmi_hwmon_chan;
 512         const struct hwmon_channel_info **asus_wmi_ci;
 513         int nr_count[hwmon_max] = {}, nr_types = 0;
 514         const struct hwmon_chip_info *chip_info;
 515         const struct ec_sensor_info *si;
 516         enum hwmon_sensor_types type;
 517         struct device *hwdev;
 518         int i, ret;
 519
 520         ret = asus_wmi_ec_fill_board_sensors(ec, bsi);
 521         if (ret)
 522                 return ret;
 523
 524         if (!sensor_data->ec.nr_sensors)
 525                 return -ENODEV;
 526
 527         for (i = 0; i < ec->nr_sensors; i++) {
 528                 si = &known_ec_sensors[ec->sensors[i].info_index];
 529                 if (!nr_count[si->type])
 530                         nr_types++;
 531                 nr_count[si->type]++;
 532         }
 533
 534         if (nr_count[hwmon_temp]) {
 535                 nr_count[hwmon_chip]++;
 536                 nr_types++;
 537         }
 538
 539         /*
 540          * If we can get values for all the registers in a single query,
 541          * the query will not change from call to call.
 542          */
 543         asus_wmi_ec_make_block_read_query(ec);
 544
 545         asus_wmi_hwmon_chan = devm_kcalloc(dev, nr_types, sizeof(*asus_wmi_hwmon_chan),
 546                                            GFP_KERNEL);
 547         if (!asus_wmi_hwmon_chan)
 548                 return -ENOMEM;
 549
 550         asus_wmi_ci = devm_kcalloc(dev, nr_types + 1, sizeof(*asus_wmi_ci), GFP_KERNEL);
 551         if (!asus_wmi_ci)
 552                 return -ENOMEM;
 553
 554         asus_wmi_ec_chip_info.info = asus_wmi_ci;
 555         chip_info = &asus_wmi_ec_chip_info;
 556
 557         for (type = 0; type < hwmon_max; type++) {
 558                 if (!nr_count[type])
 559                         continue;
 560
 561                 ret = asus_wmi_hwmon_add_chan_info(asus_wmi_hwmon_chan, dev,
 562                                                    nr_count[type], type,
 563                                                    hwmon_attributes[type]);
 564                 if (ret)
 565                         return ret;
 566
 567                 *asus_wmi_ci++ = asus_wmi_hwmon_chan++;
 568         }
 569
 570         dev_dbg(dev, "board has %d EC sensors that span %d registers",
 571                 ec->nr_sensors, ec->nr_registers);
 572
 573         hwdev = devm_hwmon_device_register_with_info(dev, "asus_wmi_ec_sensors",
 574                                                      sensor_data, chip_info, NULL);
 575
 576         return PTR_ERR_OR_ZERO(hwdev);
 577 }
 578
 579 static int asus_wmi_probe(struct wmi_device *wdev, const void *context)
 580 {
 581         struct asus_wmi_sensors *sensor_data;
 582         struct asus_wmi_data *board_sensors;
 583         const struct dmi_system_id *dmi_id;
 584         const enum known_ec_sensor *bsi;
 585         struct device *dev = &wdev->dev;
 586
 587         dmi_id = dmi_first_match(asus_wmi_ec_dmi_table);
 588         if (!dmi_id)
 589                 return -ENODEV;
 590
 591         board_sensors = dmi_id->driver_data;
 592         bsi = board_sensors->known_board_sensors;
 593
 594         sensor_data = devm_kzalloc(dev, sizeof(*sensor_data), GFP_KERNEL);
 595         if (!sensor_data)
 596                 return -ENOMEM;
 597
 598         mutex_init(&sensor_data->lock);
 599
 600         dev_set_drvdata(dev, sensor_data);
 601
 602         return asus_wmi_ec_configure_sensor_setup(dev, bsi);
 603 }
 604
 605 static const struct wmi_device_id asus_ec_wmi_id_table[] = {
 606         { ASUSWMI_MONITORING_GUID, NULL },
 607         { }
 608 };
 609
 610 static struct wmi_driver asus_sensors_wmi_driver = {
 611         .driver = {
 612                 .name = "asus_wmi_ec_sensors",
 613         },
 614         .id_table = asus_ec_wmi_id_table,
 615         .probe = asus_wmi_probe,
 616 };
 617 module_wmi_driver(asus_sensors_wmi_driver);
 618
 619 MODULE_AUTHOR("Ed Brindley <kernel@maidavale.org>");
 620 MODULE_AUTHOR("Eugene Shalygin <eugene.shalygin@gmail.com>");
 621 MODULE_DESCRIPTION("Asus WMI Sensors Driver");
 622 MODULE_LICENSE("GPL");