drivers/hwmon/asus-ec-sensors.c

   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 #define ASUS_HW_ACCESS_MUTEX_RMTW_ASMX  "\\RMTW.ASMX"
  58
  59 #define ASUS_HW_ACCESS_MUTEX_SB_PCI0_SBRG_SIO1_MUT0 "\\_SB_.PCI0.SBRG.SIO1.MUT0"
  60
  61 #define MAX_IDENTICAL_BOARD_VARIATIONS  3
  62
  63 /* Moniker for the ACPI global lock (':' is not allowed in ASL identifiers) */
  64 #define ACPI_GLOBAL_LOCK_PSEUDO_PATH    ":GLOBAL_LOCK"
  65
  66 typedef union {
  67         u32 value;
  68         struct {
  69                 u8 index;
  70                 u8 bank;
  71                 u8 size;
  72                 u8 dummy;
  73         } components;
  74 } sensor_address;
  75
  76 #define MAKE_SENSOR_ADDRESS(size, bank, index) {                               \
  77                 .value = (size << 16) + (bank << 8) + index                    \
  78         }
  79
  80 static u32 hwmon_attributes[hwmon_max] = {
  81         [hwmon_chip] = HWMON_C_REGISTER_TZ,
  82         [hwmon_temp] = HWMON_T_INPUT | HWMON_T_LABEL,
  83         [hwmon_in] = HWMON_I_INPUT | HWMON_I_LABEL,
  84         [hwmon_curr] = HWMON_C_INPUT | HWMON_C_LABEL,
  85         [hwmon_fan] = HWMON_F_INPUT | HWMON_F_LABEL,
  86 };
  87
  88 struct ec_sensor_info {
  89         char label[SENSOR_LABEL_LEN];
  90         enum hwmon_sensor_types type;
  91         sensor_address addr;
  92 };
  93
  94 #define EC_SENSOR(sensor_label, sensor_type, size, bank, index) {              \
  95                 .label = sensor_label, .type = sensor_type,                    \
  96                 .addr = MAKE_SENSOR_ADDRESS(size, bank, index),                \
  97         }
  98
  99 enum ec_sensors {
 100         /* chipset temperature [℃] */
 101         ec_sensor_temp_chipset,
 102         /* CPU temperature [℃] */
 103         ec_sensor_temp_cpu,
 104         /* CPU package temperature [℃] */
 105         ec_sensor_temp_cpu_package,
 106         /* motherboard temperature [℃] */
 107         ec_sensor_temp_mb,
 108         /* "T_Sensor" temperature sensor reading [℃] */
 109         ec_sensor_temp_t_sensor,
 110         /* VRM temperature [℃] */
 111         ec_sensor_temp_vrm,
 112         /* CPU Core voltage [mV] */
 113         ec_sensor_in_cpu_core,
 114         /* CPU_Opt fan [RPM] */
 115         ec_sensor_fan_cpu_opt,
 116         /* VRM heat sink fan [RPM] */
 117         ec_sensor_fan_vrm_hs,
 118         /* Chipset fan [RPM] */
 119         ec_sensor_fan_chipset,
 120         /* Water flow sensor reading [RPM] */
 121         ec_sensor_fan_water_flow,
 122         /* CPU current [A] */
 123         ec_sensor_curr_cpu,
 124         /* "Water_In" temperature sensor reading [℃] */
 125         ec_sensor_temp_water_in,
 126         /* "Water_Out" temperature sensor reading [℃] */
 127         ec_sensor_temp_water_out,
 128         /* "Water_Block_In" temperature sensor reading [℃] */
 129         ec_sensor_temp_water_block_in,
 130         /* "Water_Block_Out" temperature sensor reading [℃] */
 131         ec_sensor_temp_water_block_out,
 132         /* "T_sensor_2" temperature sensor reading [℃] */
 133         ec_sensor_temp_t_sensor_2,
 134         /* "Extra_1" temperature sensor reading [℃] */
 135         ec_sensor_temp_sensor_extra_1,
 136         /* "Extra_2" temperature sensor reading [℃] */
 137         ec_sensor_temp_sensor_extra_2,
 138         /* "Extra_3" temperature sensor reading [℃] */
 139         ec_sensor_temp_sensor_extra_3,
 140 };
 141
 142 #define SENSOR_TEMP_CHIPSET BIT(ec_sensor_temp_chipset)
 143 #define SENSOR_TEMP_CPU BIT(ec_sensor_temp_cpu)
 144 #define SENSOR_TEMP_CPU_PACKAGE BIT(ec_sensor_temp_cpu_package)
 145 #define SENSOR_TEMP_MB BIT(ec_sensor_temp_mb)
 146 #define SENSOR_TEMP_T_SENSOR BIT(ec_sensor_temp_t_sensor)
 147 #define SENSOR_TEMP_VRM BIT(ec_sensor_temp_vrm)
 148 #define SENSOR_IN_CPU_CORE BIT(ec_sensor_in_cpu_core)
 149 #define SENSOR_FAN_CPU_OPT BIT(ec_sensor_fan_cpu_opt)
 150 #define SENSOR_FAN_VRM_HS BIT(ec_sensor_fan_vrm_hs)
 151 #define SENSOR_FAN_CHIPSET BIT(ec_sensor_fan_chipset)
 152 #define SENSOR_FAN_WATER_FLOW BIT(ec_sensor_fan_water_flow)
 153 #define SENSOR_CURR_CPU BIT(ec_sensor_curr_cpu)
 154 #define SENSOR_TEMP_WATER_IN BIT(ec_sensor_temp_water_in)
 155 #define SENSOR_TEMP_WATER_OUT BIT(ec_sensor_temp_water_out)
 156 #define SENSOR_TEMP_WATER_BLOCK_IN BIT(ec_sensor_temp_water_block_in)
 157 #define SENSOR_TEMP_WATER_BLOCK_OUT BIT(ec_sensor_temp_water_block_out)
 158 #define SENSOR_TEMP_T_SENSOR_2 BIT(ec_sensor_temp_t_sensor_2)
 159 #define SENSOR_TEMP_SENSOR_EXTRA_1 BIT(ec_sensor_temp_sensor_extra_1)
 160 #define SENSOR_TEMP_SENSOR_EXTRA_2 BIT(ec_sensor_temp_sensor_extra_2)
 161 #define SENSOR_TEMP_SENSOR_EXTRA_3 BIT(ec_sensor_temp_sensor_extra_3)
 162
 163 enum board_family {
 164         family_unknown,
 165         family_amd_400_series,
 166         family_amd_500_series,
 167         family_amd_600_series,
 168         family_intel_300_series,
 169         family_intel_600_series
 170 };
 171
 172 /* All the known sensors for ASUS EC controllers */
 173 static const struct ec_sensor_info sensors_family_amd_400[] = {
 174         [ec_sensor_temp_chipset] =
 175                 EC_SENSOR("Chipset", hwmon_temp, 1, 0x00, 0x3a),
 176         [ec_sensor_temp_cpu] =
 177                 EC_SENSOR("CPU", hwmon_temp, 1, 0x00, 0x3b),
 178         [ec_sensor_temp_mb] =
 179                 EC_SENSOR("Motherboard", hwmon_temp, 1, 0x00, 0x3c),
 180         [ec_sensor_temp_t_sensor] =
 181                 EC_SENSOR("T_Sensor", hwmon_temp, 1, 0x00, 0x3d),
 182         [ec_sensor_temp_vrm] =
 183                 EC_SENSOR("VRM", hwmon_temp, 1, 0x00, 0x3e),
 184         [ec_sensor_in_cpu_core] =
 185                 EC_SENSOR("CPU Core", hwmon_in, 2, 0x00, 0xa2),
 186         [ec_sensor_fan_cpu_opt] =
 187                 EC_SENSOR("CPU_Opt", hwmon_fan, 2, 0x00, 0xbc),
 188         [ec_sensor_fan_vrm_hs] =
 189                 EC_SENSOR("VRM HS", hwmon_fan, 2, 0x00, 0xb2),
 190         [ec_sensor_fan_chipset] =
 191                 /* no chipset fans in this generation */
 192                 EC_SENSOR("Chipset", hwmon_fan, 0, 0x00, 0x00),
 193         [ec_sensor_fan_water_flow] =
 194                 EC_SENSOR("Water_Flow", hwmon_fan, 2, 0x00, 0xb4),
 195         [ec_sensor_curr_cpu] =
 196                 EC_SENSOR("CPU", hwmon_curr, 1, 0x00, 0xf4),
 197         [ec_sensor_temp_water_in] =
 198                 EC_SENSOR("Water_In", hwmon_temp, 1, 0x01, 0x0d),
 199         [ec_sensor_temp_water_out] =
 200                 EC_SENSOR("Water_Out", hwmon_temp, 1, 0x01, 0x0b),
 201 };
 202
 203 static const struct ec_sensor_info sensors_family_amd_500[] = {
 204         [ec_sensor_temp_chipset] =
 205                 EC_SENSOR("Chipset", hwmon_temp, 1, 0x00, 0x3a),
 206         [ec_sensor_temp_cpu] = EC_SENSOR("CPU", hwmon_temp, 1, 0x00, 0x3b),
 207         [ec_sensor_temp_mb] =
 208                 EC_SENSOR("Motherboard", hwmon_temp, 1, 0x00, 0x3c),
 209         [ec_sensor_temp_t_sensor] =
 210                 EC_SENSOR("T_Sensor", hwmon_temp, 1, 0x00, 0x3d),
 211         [ec_sensor_temp_vrm] = EC_SENSOR("VRM", hwmon_temp, 1, 0x00, 0x3e),
 212         [ec_sensor_in_cpu_core] =
 213                 EC_SENSOR("CPU Core", hwmon_in, 2, 0x00, 0xa2),
 214         [ec_sensor_fan_cpu_opt] =
 215                 EC_SENSOR("CPU_Opt", hwmon_fan, 2, 0x00, 0xb0),
 216         [ec_sensor_fan_vrm_hs] = EC_SENSOR("VRM HS", hwmon_fan, 2, 0x00, 0xb2),
 217         [ec_sensor_fan_chipset] =
 218                 EC_SENSOR("Chipset", hwmon_fan, 2, 0x00, 0xb4),
 219         [ec_sensor_fan_water_flow] =
 220                 EC_SENSOR("Water_Flow", hwmon_fan, 2, 0x00, 0xbc),
 221         [ec_sensor_curr_cpu] = EC_SENSOR("CPU", hwmon_curr, 1, 0x00, 0xf4),
 222         [ec_sensor_temp_water_in] =
 223                 EC_SENSOR("Water_In", hwmon_temp, 1, 0x01, 0x00),
 224         [ec_sensor_temp_water_out] =
 225                 EC_SENSOR("Water_Out", hwmon_temp, 1, 0x01, 0x01),
 226         [ec_sensor_temp_water_block_in] =
 227                 EC_SENSOR("Water_Block_In", hwmon_temp, 1, 0x01, 0x02),
 228         [ec_sensor_temp_water_block_out] =
 229                 EC_SENSOR("Water_Block_Out", hwmon_temp, 1, 0x01, 0x03),
 230         [ec_sensor_temp_sensor_extra_1] =
 231                 EC_SENSOR("Extra_1", hwmon_temp, 1, 0x01, 0x09),
 232         [ec_sensor_temp_t_sensor_2] =
 233                 EC_SENSOR("T_sensor_2", hwmon_temp, 1, 0x01, 0x0a),
 234         [ec_sensor_temp_sensor_extra_2] =
 235                 EC_SENSOR("Extra_2", hwmon_temp, 1, 0x01, 0x0b),
 236         [ec_sensor_temp_sensor_extra_3] =
 237                 EC_SENSOR("Extra_3", hwmon_temp, 1, 0x01, 0x0c),
 238 };
 239
 240 static const struct ec_sensor_info sensors_family_amd_600[] = {
 241         [ec_sensor_temp_cpu] = EC_SENSOR("CPU", hwmon_temp, 1, 0x00, 0x30),
 242         [ec_sensor_temp_cpu_package] = EC_SENSOR("CPU Package", hwmon_temp, 1, 0x00, 0x31),
 243         [ec_sensor_temp_mb] =
 244         EC_SENSOR("Motherboard", hwmon_temp, 1, 0x00, 0x32),
 245         [ec_sensor_temp_vrm] =
 246                 EC_SENSOR("VRM", hwmon_temp, 1, 0x00, 0x33),
 247         [ec_sensor_temp_water_in] =
 248                 EC_SENSOR("Water_In", hwmon_temp, 1, 0x01, 0x00),
 249         [ec_sensor_temp_water_out] =
 250                 EC_SENSOR("Water_Out", hwmon_temp, 1, 0x01, 0x01),
 251 };
 252
 253 static const struct ec_sensor_info sensors_family_intel_300[] = {
 254         [ec_sensor_temp_chipset] =
 255                 EC_SENSOR("Chipset", hwmon_temp, 1, 0x00, 0x3a),
 256         [ec_sensor_temp_cpu] = EC_SENSOR("CPU", hwmon_temp, 1, 0x00, 0x3b),
 257         [ec_sensor_temp_mb] =
 258                 EC_SENSOR("Motherboard", hwmon_temp, 1, 0x00, 0x3c),
 259         [ec_sensor_temp_t_sensor] =
 260                 EC_SENSOR("T_Sensor", hwmon_temp, 1, 0x00, 0x3d),
 261         [ec_sensor_temp_vrm] = EC_SENSOR("VRM", hwmon_temp, 1, 0x00, 0x3e),
 262         [ec_sensor_fan_cpu_opt] =
 263                 EC_SENSOR("CPU_Opt", hwmon_fan, 2, 0x00, 0xb0),
 264         [ec_sensor_fan_vrm_hs] = EC_SENSOR("VRM HS", hwmon_fan, 2, 0x00, 0xb2),
 265         [ec_sensor_fan_water_flow] =
 266                 EC_SENSOR("Water_Flow", hwmon_fan, 2, 0x00, 0xbc),
 267         [ec_sensor_temp_water_in] =
 268                 EC_SENSOR("Water_In", hwmon_temp, 1, 0x01, 0x00),
 269         [ec_sensor_temp_water_out] =
 270                 EC_SENSOR("Water_Out", hwmon_temp, 1, 0x01, 0x01),
 271 };
 272
 273 static const struct ec_sensor_info sensors_family_intel_600[] = {
 274         [ec_sensor_temp_t_sensor] =
 275                 EC_SENSOR("T_Sensor", hwmon_temp, 1, 0x00, 0x3d),
 276         [ec_sensor_temp_vrm] = EC_SENSOR("VRM", hwmon_temp, 1, 0x00, 0x3e),
 277 };
 278
 279 /* Shortcuts for common combinations */
 280 #define SENSOR_SET_TEMP_CHIPSET_CPU_MB                                         \
 281         (SENSOR_TEMP_CHIPSET | SENSOR_TEMP_CPU | SENSOR_TEMP_MB)
 282 #define SENSOR_SET_TEMP_WATER (SENSOR_TEMP_WATER_IN | SENSOR_TEMP_WATER_OUT)
 283 #define SENSOR_SET_WATER_BLOCK                                                 \
 284         (SENSOR_TEMP_WATER_BLOCK_IN | SENSOR_TEMP_WATER_BLOCK_OUT)
 285
 286 struct ec_board_info {
 287         unsigned long sensors;
 288         /*
 289          * Defines which mutex to use for guarding access to the state and the
 290          * hardware. Can be either a full path to an AML mutex or the
 291          * pseudo-path ACPI_GLOBAL_LOCK_PSEUDO_PATH to use the global ACPI lock,
 292          * or left empty to use a regular mutex object, in which case access to
 293          * the hardware is not guarded.
 294          */
 295         const char *mutex_path;
 296         enum board_family family;
 297 };
 298
 299 static const struct ec_board_info board_info_prime_x470_pro = {
 300         .sensors = SENSOR_SET_TEMP_CHIPSET_CPU_MB |
 301                 SENSOR_TEMP_T_SENSOR | SENSOR_TEMP_VRM |
 302                 SENSOR_FAN_CPU_OPT |
 303                 SENSOR_CURR_CPU | SENSOR_IN_CPU_CORE,
 304         .mutex_path = ACPI_GLOBAL_LOCK_PSEUDO_PATH,
 305         .family = family_amd_400_series,
 306 };
 307
 308 static const struct ec_board_info board_info_prime_x570_pro = {
 309         .sensors = SENSOR_SET_TEMP_CHIPSET_CPU_MB | SENSOR_TEMP_VRM |
 310                 SENSOR_TEMP_T_SENSOR | SENSOR_FAN_CHIPSET,
 311         .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX,
 312         .family = family_amd_500_series,
 313 };
 314
 315 static const struct ec_board_info board_info_pro_art_x570_creator_wifi = {
 316         .sensors = SENSOR_SET_TEMP_CHIPSET_CPU_MB | SENSOR_TEMP_VRM |
 317                 SENSOR_TEMP_T_SENSOR | SENSOR_FAN_CPU_OPT |
 318                 SENSOR_CURR_CPU | SENSOR_IN_CPU_CORE,
 319         .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX,
 320         .family = family_amd_500_series,
 321 };
 322
 323 static const struct ec_board_info board_info_pro_art_b550_creator = {
 324         .sensors = SENSOR_SET_TEMP_CHIPSET_CPU_MB |
 325                 SENSOR_TEMP_T_SENSOR |
 326                 SENSOR_FAN_CPU_OPT,
 327         .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX,
 328         .family = family_amd_500_series,
 329 };
 330
 331 static const struct ec_board_info board_info_pro_ws_x570_ace = {
 332         .sensors = SENSOR_SET_TEMP_CHIPSET_CPU_MB | SENSOR_TEMP_VRM |
 333                 SENSOR_TEMP_T_SENSOR | SENSOR_FAN_CHIPSET |
 334                 SENSOR_CURR_CPU | SENSOR_IN_CPU_CORE,
 335         .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX,
 336         .family = family_amd_500_series,
 337 };
 338
 339 static const struct ec_board_info board_info_crosshair_x670e_hero = {
 340         .sensors = SENSOR_TEMP_CPU | SENSOR_TEMP_CPU_PACKAGE |
 341                 SENSOR_TEMP_MB | SENSOR_TEMP_VRM |
 342                 SENSOR_SET_TEMP_WATER,
 343         .mutex_path = ACPI_GLOBAL_LOCK_PSEUDO_PATH,
 344         .family = family_amd_600_series,
 345 };
 346
 347 static const struct ec_board_info board_info_crosshair_viii_dark_hero = {
 348         .sensors = SENSOR_SET_TEMP_CHIPSET_CPU_MB |
 349                 SENSOR_TEMP_T_SENSOR |
 350                 SENSOR_TEMP_VRM | SENSOR_SET_TEMP_WATER |
 351                 SENSOR_FAN_CPU_OPT | SENSOR_FAN_WATER_FLOW |
 352                 SENSOR_CURR_CPU | SENSOR_IN_CPU_CORE,
 353         .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX,
 354         .family = family_amd_500_series,
 355 };
 356
 357 static const struct ec_board_info board_info_crosshair_viii_hero = {
 358         .sensors = SENSOR_SET_TEMP_CHIPSET_CPU_MB |
 359                 SENSOR_TEMP_T_SENSOR |
 360                 SENSOR_TEMP_VRM | SENSOR_SET_TEMP_WATER |
 361                 SENSOR_FAN_CPU_OPT | SENSOR_FAN_CHIPSET |
 362                 SENSOR_FAN_WATER_FLOW | SENSOR_CURR_CPU |
 363                 SENSOR_IN_CPU_CORE,
 364         .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX,
 365         .family = family_amd_500_series,
 366 };
 367
 368 static const struct ec_board_info board_info_maximus_xi_hero = {
 369         .sensors = SENSOR_SET_TEMP_CHIPSET_CPU_MB |
 370                 SENSOR_TEMP_T_SENSOR |
 371                 SENSOR_TEMP_VRM | SENSOR_SET_TEMP_WATER |
 372                 SENSOR_FAN_CPU_OPT | SENSOR_FAN_WATER_FLOW,
 373         .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX,
 374         .family = family_intel_300_series,
 375 };
 376
 377 static const struct ec_board_info board_info_crosshair_viii_impact = {
 378         .sensors = SENSOR_SET_TEMP_CHIPSET_CPU_MB |
 379                 SENSOR_TEMP_T_SENSOR | SENSOR_TEMP_VRM |
 380                 SENSOR_FAN_CHIPSET | SENSOR_CURR_CPU |
 381                 SENSOR_IN_CPU_CORE,
 382         .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX,
 383         .family = family_amd_500_series,
 384 };
 385
 386 static const struct ec_board_info board_info_strix_b550_e_gaming = {
 387         .sensors = SENSOR_SET_TEMP_CHIPSET_CPU_MB |
 388                 SENSOR_TEMP_T_SENSOR | SENSOR_TEMP_VRM |
 389                 SENSOR_FAN_CPU_OPT,
 390         .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX,
 391         .family = family_amd_500_series,
 392 };
 393
 394 static const struct ec_board_info board_info_strix_b550_i_gaming = {
 395         .sensors = SENSOR_SET_TEMP_CHIPSET_CPU_MB |
 396                 SENSOR_TEMP_T_SENSOR | SENSOR_TEMP_VRM |
 397                 SENSOR_FAN_VRM_HS | SENSOR_CURR_CPU |
 398                 SENSOR_IN_CPU_CORE,
 399         .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX,
 400         .family = family_amd_500_series,
 401 };
 402
 403 static const struct ec_board_info board_info_strix_x570_e_gaming = {
 404         .sensors = SENSOR_SET_TEMP_CHIPSET_CPU_MB |
 405                 SENSOR_TEMP_T_SENSOR | SENSOR_TEMP_VRM |
 406                 SENSOR_FAN_CHIPSET | SENSOR_CURR_CPU |
 407                 SENSOR_IN_CPU_CORE,
 408         .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX,
 409         .family = family_amd_500_series,
 410 };
 411
 412 static const struct ec_board_info board_info_strix_x570_e_gaming_wifi_ii = {
 413         .sensors = SENSOR_SET_TEMP_CHIPSET_CPU_MB |
 414                 SENSOR_TEMP_T_SENSOR | SENSOR_CURR_CPU |
 415                 SENSOR_IN_CPU_CORE,
 416         .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX,
 417         .family = family_amd_500_series,
 418 };
 419
 420 static const struct ec_board_info board_info_strix_x570_f_gaming = {
 421         .sensors = SENSOR_SET_TEMP_CHIPSET_CPU_MB |
 422                 SENSOR_TEMP_T_SENSOR | SENSOR_FAN_CHIPSET,
 423         .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX,
 424         .family = family_amd_500_series,
 425 };
 426
 427 static const struct ec_board_info board_info_strix_x570_i_gaming = {
 428         .sensors = SENSOR_TEMP_CHIPSET | SENSOR_TEMP_VRM |
 429                 SENSOR_TEMP_T_SENSOR |
 430                 SENSOR_FAN_VRM_HS | SENSOR_FAN_CHIPSET |
 431                 SENSOR_CURR_CPU | SENSOR_IN_CPU_CORE,
 432         .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX,
 433         .family = family_amd_500_series,
 434 };
 435
 436 static const struct ec_board_info board_info_strix_z390_f_gaming = {
 437         .sensors = SENSOR_TEMP_CHIPSET | SENSOR_TEMP_VRM |
 438                 SENSOR_TEMP_T_SENSOR |
 439                 SENSOR_FAN_CPU_OPT,
 440         .mutex_path = ASUS_HW_ACCESS_MUTEX_ASMX,
 441         .family = family_intel_300_series,
 442 };
 443
 444 static const struct ec_board_info board_info_strix_z690_a_gaming_wifi_d4 = {
 445         .sensors = SENSOR_TEMP_T_SENSOR | SENSOR_TEMP_VRM,
 446         .mutex_path = ASUS_HW_ACCESS_MUTEX_RMTW_ASMX,
 447         .family = family_intel_600_series,
 448 };
 449
 450 static const struct ec_board_info board_info_zenith_ii_extreme = {
 451         .sensors = SENSOR_SET_TEMP_CHIPSET_CPU_MB | SENSOR_TEMP_T_SENSOR |
 452                 SENSOR_TEMP_VRM | SENSOR_SET_TEMP_WATER |
 453                 SENSOR_FAN_CPU_OPT | SENSOR_FAN_CHIPSET | SENSOR_FAN_VRM_HS |
 454                 SENSOR_FAN_WATER_FLOW | SENSOR_CURR_CPU | SENSOR_IN_CPU_CORE |
 455                 SENSOR_SET_WATER_BLOCK |
 456                 SENSOR_TEMP_T_SENSOR_2 | SENSOR_TEMP_SENSOR_EXTRA_1 |
 457                 SENSOR_TEMP_SENSOR_EXTRA_2 | SENSOR_TEMP_SENSOR_EXTRA_3,
 458         .mutex_path = ASUS_HW_ACCESS_MUTEX_SB_PCI0_SBRG_SIO1_MUT0,
 459         .family = family_amd_500_series,
 460 };
 461
 462 #define DMI_EXACT_MATCH_ASUS_BOARD_NAME(name, board_info)                      \
 463         {                                                                      \
 464                 .matches = {                                                   \
 465                         DMI_EXACT_MATCH(DMI_BOARD_VENDOR,                      \
 466                                         "ASUSTeK COMPUTER INC."),              \
 467                         DMI_EXACT_MATCH(DMI_BOARD_NAME, name),                 \
 468                 },                                                             \
 469                 .driver_data = (void *)board_info,                              \
 470         }
 471
 472 static const struct dmi_system_id dmi_table[] = {
 473         DMI_EXACT_MATCH_ASUS_BOARD_NAME("PRIME X470-PRO",
 474                                         &board_info_prime_x470_pro),
 475         DMI_EXACT_MATCH_ASUS_BOARD_NAME("PRIME X570-PRO",
 476                                         &board_info_prime_x570_pro),
 477         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ProArt X570-CREATOR WIFI",
 478                                         &board_info_pro_art_x570_creator_wifi),
 479         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ProArt B550-CREATOR",
 480                                         &board_info_pro_art_b550_creator),
 481         DMI_EXACT_MATCH_ASUS_BOARD_NAME("Pro WS X570-ACE",
 482                                         &board_info_pro_ws_x570_ace),
 483         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VIII DARK HERO",
 484                                         &board_info_crosshair_viii_dark_hero),
 485         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VIII FORMULA",
 486                                         &board_info_crosshair_viii_hero),
 487         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VIII HERO",
 488                                         &board_info_crosshair_viii_hero),
 489         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VIII HERO (WI-FI)",
 490                                         &board_info_crosshair_viii_hero),
 491         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR X670E HERO",
 492                                         &board_info_crosshair_x670e_hero),
 493         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG MAXIMUS XI HERO",
 494                                         &board_info_maximus_xi_hero),
 495         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG MAXIMUS XI HERO (WI-FI)",
 496                                         &board_info_maximus_xi_hero),
 497         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG CROSSHAIR VIII IMPACT",
 498                                         &board_info_crosshair_viii_impact),
 499         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX B550-E GAMING",
 500                                         &board_info_strix_b550_e_gaming),
 501         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX B550-I GAMING",
 502                                         &board_info_strix_b550_i_gaming),
 503         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX X570-E GAMING",
 504                                         &board_info_strix_x570_e_gaming),
 505         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX X570-E GAMING WIFI II",
 506                                         &board_info_strix_x570_e_gaming_wifi_ii),
 507         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX X570-F GAMING",
 508                                         &board_info_strix_x570_f_gaming),
 509         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX X570-I GAMING",
 510                                         &board_info_strix_x570_i_gaming),
 511         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX Z390-F GAMING",
 512                                         &board_info_strix_z390_f_gaming),
 513         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG STRIX Z690-A GAMING WIFI D4",
 514                                         &board_info_strix_z690_a_gaming_wifi_d4),
 515         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG ZENITH II EXTREME",
 516                                         &board_info_zenith_ii_extreme),
 517         DMI_EXACT_MATCH_ASUS_BOARD_NAME("ROG ZENITH II EXTREME ALPHA",
 518                                         &board_info_zenith_ii_extreme),
 519         {},
 520 };
 521
 522 struct ec_sensor {
 523         unsigned int info_index;
 524         s32 cached_value;
 525 };
 526
 527 struct lock_data {
 528         union {
 529                 acpi_handle aml;
 530                 /* global lock handle */
 531                 u32 glk;
 532         } mutex;
 533         bool (*lock)(struct lock_data *data);
 534         bool (*unlock)(struct lock_data *data);
 535 };
 536
 537 /*
 538  * The next function pairs implement options for locking access to the
 539  * state and the EC
 540  */
 541 static bool lock_via_acpi_mutex(struct lock_data *data)
 542 {
 543         /*
 544          * ASUS DSDT does not specify that access to the EC has to be guarded,
 545          * but firmware does access it via ACPI
 546          */
 547         return ACPI_SUCCESS(acpi_acquire_mutex(data->mutex.aml,
 548                                                NULL, ACPI_LOCK_DELAY_MS));
 549 }
 550
 551 static bool unlock_acpi_mutex(struct lock_data *data)
 552 {
 553         return ACPI_SUCCESS(acpi_release_mutex(data->mutex.aml, NULL));
 554 }
 555
 556 static bool lock_via_global_acpi_lock(struct lock_data *data)
 557 {
 558         return ACPI_SUCCESS(acpi_acquire_global_lock(ACPI_LOCK_DELAY_MS,
 559                                                      &data->mutex.glk));
 560 }
 561
 562 static bool unlock_global_acpi_lock(struct lock_data *data)
 563 {
 564         return ACPI_SUCCESS(acpi_release_global_lock(data->mutex.glk));
 565 }
 566
 567 struct ec_sensors_data {
 568         const struct ec_board_info *board_info;
 569         const struct ec_sensor_info *sensors_info;
 570         struct ec_sensor *sensors;
 571         /* EC registers to read from */
 572         u16 *registers;
 573         u8 *read_buffer;
 574         /* sorted list of unique register banks */
 575         u8 banks[ASUS_EC_MAX_BANK + 1];
 576         /* in jiffies */
 577         unsigned long last_updated;
 578         struct lock_data lock_data;
 579         /* number of board EC sensors */
 580         u8 nr_sensors;
 581         /*
 582          * number of EC registers to read
 583          * (sensor might span more than 1 register)
 584          */
 585         u8 nr_registers;
 586         /* number of unique register banks */
 587         u8 nr_banks;
 588 };
 589
 590 static u8 register_bank(u16 reg)
 591 {
 592         return reg >> 8;
 593 }
 594
 595 static u8 register_index(u16 reg)
 596 {
 597         return reg & 0x00ff;
 598 }
 599
 600 static bool is_sensor_data_signed(const struct ec_sensor_info *si)
 601 {
 602         /*
 603          * guessed from WMI functions in DSDT code for boards
 604          * of the X470 generation
 605          */
 606         return si->type == hwmon_temp;
 607 }
 608
 609 static const struct ec_sensor_info *
 610 get_sensor_info(const struct ec_sensors_data *state, int index)
 611 {
 612         return state->sensors_info + state->sensors[index].info_index;
 613 }
 614
 615 static int find_ec_sensor_index(const struct ec_sensors_data *ec,
 616                                 enum hwmon_sensor_types type, int channel)
 617 {
 618         unsigned int i;
 619
 620         for (i = 0; i < ec->nr_sensors; i++) {
 621                 if (get_sensor_info(ec, i)->type == type) {
 622                         if (channel == 0)
 623                                 return i;
 624                         channel--;
 625                 }
 626         }
 627         return -ENOENT;
 628 }
 629
 630 static int bank_compare(const void *a, const void *b)
 631 {
 632         return *((const s8 *)a) - *((const s8 *)b);
 633 }
 634
 635 static void setup_sensor_data(struct ec_sensors_data *ec)
 636 {
 637         struct ec_sensor *s = ec->sensors;
 638         bool bank_found;
 639         int i, j;
 640         u8 bank;
 641
 642         ec->nr_banks = 0;
 643         ec->nr_registers = 0;
 644
 645         for_each_set_bit(i, &ec->board_info->sensors,
 646                          BITS_PER_TYPE(ec->board_info->sensors)) {
 647                 s->info_index = i;
 648                 s->cached_value = 0;
 649                 ec->nr_registers +=
 650                         ec->sensors_info[s->info_index].addr.components.size;
 651                 bank_found = false;
 652                 bank = ec->sensors_info[s->info_index].addr.components.bank;
 653                 for (j = 0; j < ec->nr_banks; j++) {
 654                         if (ec->banks[j] == bank) {
 655                                 bank_found = true;
 656                                 break;
 657                         }
 658                 }
 659                 if (!bank_found) {
 660                         ec->banks[ec->nr_banks++] = bank;
 661                 }
 662                 s++;
 663         }
 664         sort(ec->banks, ec->nr_banks, 1, bank_compare, NULL);
 665 }
 666
 667 static void fill_ec_registers(struct ec_sensors_data *ec)
 668 {
 669         const struct ec_sensor_info *si;
 670         unsigned int i, j, register_idx = 0;
 671
 672         for (i = 0; i < ec->nr_sensors; ++i) {
 673                 si = get_sensor_info(ec, i);
 674                 for (j = 0; j < si->addr.components.size; ++j, ++register_idx) {
 675                         ec->registers[register_idx] =
 676                                 (si->addr.components.bank << 8) +
 677                                 si->addr.components.index + j;
 678                 }
 679         }
 680 }
 681
 682 static int setup_lock_data(struct device *dev)
 683 {
 684         const char *mutex_path;
 685         int status;
 686         struct ec_sensors_data *state = dev_get_drvdata(dev);
 687
 688         mutex_path = mutex_path_override ?
 689                 mutex_path_override : state->board_info->mutex_path;
 690
 691         if (!mutex_path || !strlen(mutex_path)) {
 692                 dev_err(dev, "Hardware access guard mutex name is empty");
 693                 return -EINVAL;
 694         }
 695         if (!strcmp(mutex_path, ACPI_GLOBAL_LOCK_PSEUDO_PATH)) {
 696                 state->lock_data.mutex.glk = 0;
 697                 state->lock_data.lock = lock_via_global_acpi_lock;
 698                 state->lock_data.unlock = unlock_global_acpi_lock;
 699         } else {
 700                 status = acpi_get_handle(NULL, (acpi_string)mutex_path,
 701                                          &state->lock_data.mutex.aml);
 702                 if (ACPI_FAILURE(status)) {
 703                         dev_err(dev,
 704                                 "Failed to get hardware access guard AML mutex '%s': error %d",
 705                                 mutex_path, status);
 706                         return -ENOENT;
 707                 }
 708                 state->lock_data.lock = lock_via_acpi_mutex;
 709                 state->lock_data.unlock = unlock_acpi_mutex;
 710         }
 711         return 0;
 712 }
 713
 714 static int asus_ec_bank_switch(u8 bank, u8 *old)
 715 {
 716         int status = 0;
 717
 718         if (old) {
 719                 status = ec_read(ASUS_EC_BANK_REGISTER, old);
 720         }
 721         if (status || (old && (*old == bank)))
 722                 return status;
 723         return ec_write(ASUS_EC_BANK_REGISTER, bank);
 724 }
 725
 726 static int asus_ec_block_read(const struct device *dev,
 727                               struct ec_sensors_data *ec)
 728 {
 729         int ireg, ibank, status;
 730         u8 bank, reg_bank, prev_bank;
 731
 732         bank = 0;
 733         status = asus_ec_bank_switch(bank, &prev_bank);
 734         if (status) {
 735                 dev_warn(dev, "EC bank switch failed");
 736                 return status;
 737         }
 738
 739         if (prev_bank) {
 740                 /* oops... somebody else is working with the EC too */
 741                 dev_warn(dev,
 742                         "Concurrent access to the ACPI EC detected.\nRace condition possible.");
 743         }
 744
 745         /* read registers minimizing bank switches. */
 746         for (ibank = 0; ibank < ec->nr_banks; ibank++) {
 747                 if (bank != ec->banks[ibank]) {
 748                         bank = ec->banks[ibank];
 749                         if (asus_ec_bank_switch(bank, NULL)) {
 750                                 dev_warn(dev, "EC bank switch to %d failed",
 751                                          bank);
 752                                 break;
 753                         }
 754                 }
 755                 for (ireg = 0; ireg < ec->nr_registers; ireg++) {
 756                         reg_bank = register_bank(ec->registers[ireg]);
 757                         if (reg_bank < bank) {
 758                                 continue;
 759                         }
 760                         ec_read(register_index(ec->registers[ireg]),
 761                                 ec->read_buffer + ireg);
 762                 }
 763         }
 764
 765         status = asus_ec_bank_switch(prev_bank, NULL);
 766         return status;
 767 }
 768
 769 static inline s32 get_sensor_value(const struct ec_sensor_info *si, u8 *data)
 770 {
 771         if (is_sensor_data_signed(si)) {
 772                 switch (si->addr.components.size) {
 773                 case 1:
 774                         return (s8)*data;
 775                 case 2:
 776                         return (s16)get_unaligned_be16(data);
 777                 case 4:
 778                         return (s32)get_unaligned_be32(data);
 779                 default:
 780                         return 0;
 781                 }
 782         } else {
 783                 switch (si->addr.components.size) {
 784                 case 1:
 785                         return *data;
 786                 case 2:
 787                         return get_unaligned_be16(data);
 788                 case 4:
 789                         return get_unaligned_be32(data);
 790                 default:
 791                         return 0;
 792                 }
 793         }
 794 }
 795
 796 static void update_sensor_values(struct ec_sensors_data *ec, u8 *data)
 797 {
 798         const struct ec_sensor_info *si;
 799         struct ec_sensor *s, *sensor_end;
 800
 801         sensor_end = ec->sensors + ec->nr_sensors;
 802         for (s = ec->sensors; s != sensor_end; s++) {
 803                 si = ec->sensors_info + s->info_index;
 804                 s->cached_value = get_sensor_value(si, data);
 805                 data += si->addr.components.size;
 806         }
 807 }
 808
 809 static int update_ec_sensors(const struct device *dev,
 810                              struct ec_sensors_data *ec)
 811 {
 812         int status;
 813
 814         if (!ec->lock_data.lock(&ec->lock_data)) {
 815                 dev_warn(dev, "Failed to acquire mutex");
 816                 return -EBUSY;
 817         }
 818
 819         status = asus_ec_block_read(dev, ec);
 820
 821         if (!status) {
 822                 update_sensor_values(ec, ec->read_buffer);
 823         }
 824
 825         if (!ec->lock_data.unlock(&ec->lock_data))
 826                 dev_err(dev, "Failed to release mutex");
 827
 828         return status;
 829 }
 830
 831 static long scale_sensor_value(s32 value, int data_type)
 832 {
 833         switch (data_type) {
 834         case hwmon_curr:
 835         case hwmon_temp:
 836                 return value * MILLI;
 837         default:
 838                 return value;
 839         }
 840 }
 841
 842 static int get_cached_value_or_update(const struct device *dev,
 843                                       int sensor_index,
 844                                       struct ec_sensors_data *state, s32 *value)
 845 {
 846         if (time_after(jiffies, state->last_updated + HZ)) {
 847                 if (update_ec_sensors(dev, state)) {
 848                         dev_err(dev, "update_ec_sensors() failure\n");
 849                         return -EIO;
 850                 }
 851
 852                 state->last_updated = jiffies;
 853         }
 854
 855         *value = state->sensors[sensor_index].cached_value;
 856         return 0;
 857 }
 858
 859 /*
 860  * Now follow the functions that implement the hwmon interface
 861  */
 862
 863 static int asus_ec_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
 864                               u32 attr, int channel, long *val)
 865 {
 866         int ret;
 867         s32 value = 0;
 868
 869         struct ec_sensors_data *state = dev_get_drvdata(dev);
 870         int sidx = find_ec_sensor_index(state, type, channel);
 871
 872         if (sidx < 0) {
 873                 return sidx;
 874         }
 875
 876         ret = get_cached_value_or_update(dev, sidx, state, &value);
 877         if (!ret) {
 878                 *val = scale_sensor_value(value,
 879                                           get_sensor_info(state, sidx)->type);
 880         }
 881
 882         return ret;
 883 }
 884
 885 static int asus_ec_hwmon_read_string(struct device *dev,
 886                                      enum hwmon_sensor_types type, u32 attr,
 887                                      int channel, const char **str)
 888 {
 889         struct ec_sensors_data *state = dev_get_drvdata(dev);
 890         int sensor_index = find_ec_sensor_index(state, type, channel);
 891         *str = get_sensor_info(state, sensor_index)->label;
 892
 893         return 0;
 894 }
 895
 896 static umode_t asus_ec_hwmon_is_visible(const void *drvdata,
 897                                         enum hwmon_sensor_types type, u32 attr,
 898                                         int channel)
 899 {
 900         const struct ec_sensors_data *state = drvdata;
 901
 902         return find_ec_sensor_index(state, type, channel) >= 0 ? S_IRUGO : 0;
 903 }
 904
 905 static int
 906 asus_ec_hwmon_add_chan_info(struct hwmon_channel_info *asus_ec_hwmon_chan,
 907                              struct device *dev, int num,
 908                              enum hwmon_sensor_types type, u32 config)
 909 {
 910         int i;
 911         u32 *cfg = devm_kcalloc(dev, num + 1, sizeof(*cfg), GFP_KERNEL);
 912
 913         if (!cfg)
 914                 return -ENOMEM;
 915
 916         asus_ec_hwmon_chan->type = type;
 917         asus_ec_hwmon_chan->config = cfg;
 918         for (i = 0; i < num; i++, cfg++)
 919                 *cfg = config;
 920
 921         return 0;
 922 }
 923
 924 static const struct hwmon_ops asus_ec_hwmon_ops = {
 925         .is_visible = asus_ec_hwmon_is_visible,
 926         .read = asus_ec_hwmon_read,
 927         .read_string = asus_ec_hwmon_read_string,
 928 };
 929
 930 static struct hwmon_chip_info asus_ec_chip_info = {
 931         .ops = &asus_ec_hwmon_ops,
 932 };
 933
 934 static const struct ec_board_info *get_board_info(void)
 935 {
 936         const struct dmi_system_id *dmi_entry;
 937
 938         dmi_entry = dmi_first_match(dmi_table);
 939         return dmi_entry ? dmi_entry->driver_data : NULL;
 940 }
 941
 942 static int asus_ec_probe(struct platform_device *pdev)
 943 {
 944         const struct hwmon_channel_info **ptr_asus_ec_ci;
 945         int nr_count[hwmon_max] = { 0 }, nr_types = 0;
 946         struct hwmon_channel_info *asus_ec_hwmon_chan;
 947         const struct ec_board_info *pboard_info;
 948         const struct hwmon_chip_info *chip_info;
 949         struct device *dev = &pdev->dev;
 950         struct ec_sensors_data *ec_data;
 951         const struct ec_sensor_info *si;
 952         enum hwmon_sensor_types type;
 953         struct device *hwdev;
 954         unsigned int i;
 955         int status;
 956
 957         pboard_info = get_board_info();
 958         if (!pboard_info)
 959                 return -ENODEV;
 960
 961         ec_data = devm_kzalloc(dev, sizeof(struct ec_sensors_data),
 962                                GFP_KERNEL);
 963         if (!ec_data)
 964                 return -ENOMEM;
 965
 966         dev_set_drvdata(dev, ec_data);
 967         ec_data->board_info = pboard_info;
 968
 969         switch (ec_data->board_info->family) {
 970         case family_amd_400_series:
 971                 ec_data->sensors_info = sensors_family_amd_400;
 972                 break;
 973         case family_amd_500_series:
 974                 ec_data->sensors_info = sensors_family_amd_500;
 975                 break;
 976         case family_amd_600_series:
 977                 ec_data->sensors_info = sensors_family_amd_600;
 978                 break;
 979         case family_intel_300_series:
 980                 ec_data->sensors_info = sensors_family_intel_300;
 981                 break;
 982         case family_intel_600_series:
 983                 ec_data->sensors_info = sensors_family_intel_600;
 984                 break;
 985         default:
 986                 dev_err(dev, "Unknown board family: %d",
 987                         ec_data->board_info->family);
 988                 return -EINVAL;
 989         }
 990
 991         ec_data->nr_sensors = hweight_long(ec_data->board_info->sensors);
 992         ec_data->sensors = devm_kcalloc(dev, ec_data->nr_sensors,
 993                                         sizeof(struct ec_sensor), GFP_KERNEL);
 994         if (!ec_data->sensors)
 995                 return -ENOMEM;
 996
 997         status = setup_lock_data(dev);
 998         if (status) {
 999                 dev_err(dev, "Failed to setup state/EC locking: %d", status);
1000                 return status;
1001         }
1002
1003         setup_sensor_data(ec_data);
1004         ec_data->registers = devm_kcalloc(dev, ec_data->nr_registers,
1005                                           sizeof(u16), GFP_KERNEL);
1006         ec_data->read_buffer = devm_kcalloc(dev, ec_data->nr_registers,
1007                                             sizeof(u8), GFP_KERNEL);
1008
1009         if (!ec_data->registers || !ec_data->read_buffer)
1010                 return -ENOMEM;
1011
1012         fill_ec_registers(ec_data);
1013
1014         for (i = 0; i < ec_data->nr_sensors; ++i) {
1015                 si = get_sensor_info(ec_data, i);
1016                 if (!nr_count[si->type])
1017                         ++nr_types;
1018                 ++nr_count[si->type];
1019         }
1020
1021         if (nr_count[hwmon_temp])
1022                 nr_count[hwmon_chip]++, nr_types++;
1023
1024         asus_ec_hwmon_chan = devm_kcalloc(
1025                 dev, nr_types, sizeof(*asus_ec_hwmon_chan), GFP_KERNEL);
1026         if (!asus_ec_hwmon_chan)
1027                 return -ENOMEM;
1028
1029         ptr_asus_ec_ci = devm_kcalloc(dev, nr_types + 1,
1030                                        sizeof(*ptr_asus_ec_ci), GFP_KERNEL);
1031         if (!ptr_asus_ec_ci)
1032                 return -ENOMEM;
1033
1034         asus_ec_chip_info.info = ptr_asus_ec_ci;
1035         chip_info = &asus_ec_chip_info;
1036
1037         for (type = 0; type < hwmon_max; ++type) {
1038                 if (!nr_count[type])
1039                         continue;
1040
1041                 asus_ec_hwmon_add_chan_info(asus_ec_hwmon_chan, dev,
1042                                              nr_count[type], type,
1043                                              hwmon_attributes[type]);
1044                 *ptr_asus_ec_ci++ = asus_ec_hwmon_chan++;
1045         }
1046
1047         dev_info(dev, "board has %d EC sensors that span %d registers",
1048                  ec_data->nr_sensors, ec_data->nr_registers);
1049
1050         hwdev = devm_hwmon_device_register_with_info(dev, "asusec",
1051                                                      ec_data, chip_info, NULL);
1052
1053         return PTR_ERR_OR_ZERO(hwdev);
1054 }
1055
1056 MODULE_DEVICE_TABLE(dmi, dmi_table);
1057
1058 static struct platform_driver asus_ec_sensors_platform_driver = {
1059         .driver = {
1060                 .name   = "asus-ec-sensors",
1061         },
1062         .probe = asus_ec_probe,
1063 };
1064
1065 static struct platform_device *asus_ec_sensors_platform_device;
1066
1067 static int __init asus_ec_init(void)
1068 {
1069         asus_ec_sensors_platform_device =
1070                 platform_create_bundle(&asus_ec_sensors_platform_driver,
1071                                        asus_ec_probe, NULL, 0, NULL, 0);
1072
1073         if (IS_ERR(asus_ec_sensors_platform_device))
1074                 return PTR_ERR(asus_ec_sensors_platform_device);
1075
1076         return 0;
1077 }
1078
1079 static void __exit asus_ec_exit(void)
1080 {
1081         platform_device_unregister(asus_ec_sensors_platform_device);
1082         platform_driver_unregister(&asus_ec_sensors_platform_driver);
1083 }
1084
1085 module_init(asus_ec_init);
1086 module_exit(asus_ec_exit);
1087
1088 module_param_named(mutex_path, mutex_path_override, charp, 0);
1089 MODULE_PARM_DESC(mutex_path,
1090                  "Override ACPI mutex path used to guard access to hardware");
1091
1092 MODULE_AUTHOR("Eugene Shalygin <eugene.shalygin@gmail.com>");
1093 MODULE_DESCRIPTION(
1094         "HWMON driver for sensors accessible via ACPI EC in ASUS motherboards");
1095 MODULE_LICENSE("GPL");