13e0a4e85SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 2a5afba16SPali Rohár /* 3a5afba16SPali Rohár * dell-smm-hwmon.c -- Linux driver for accessing the SMM BIOS on Dell laptops. 4a5afba16SPali Rohár * 5a5afba16SPali Rohár * Copyright (C) 2001 Massimo Dal Zotto <dz@debian.org> 6a5afba16SPali Rohár * 7a5afba16SPali Rohár * Hwmon integration: 8a5afba16SPali Rohár * Copyright (C) 2011 Jean Delvare <jdelvare@suse.de> 9a5afba16SPali Rohár * Copyright (C) 2013, 2014 Guenter Roeck <linux@roeck-us.net> 10149ed3d4SPali Rohár * Copyright (C) 2014, 2015 Pali Rohár <pali@kernel.org> 11a5afba16SPali Rohár */ 12a5afba16SPali Rohár 13a5afba16SPali Rohár #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 14a5afba16SPali Rohár 1527046a3fSJuergen Gross #include <linux/cpu.h> 16a5afba16SPali Rohár #include <linux/delay.h> 171492fa21SArmin Wolf #include <linux/err.h> 18a5afba16SPali Rohár #include <linux/module.h> 191492fa21SArmin Wolf #include <linux/platform_device.h> 20a5afba16SPali Rohár #include <linux/types.h> 21a5afba16SPali Rohár #include <linux/init.h> 22a5afba16SPali Rohár #include <linux/proc_fs.h> 23a5afba16SPali Rohár #include <linux/seq_file.h> 24a5afba16SPali Rohár #include <linux/dmi.h> 25a5afba16SPali Rohár #include <linux/capability.h> 26a5afba16SPali Rohár #include <linux/mutex.h> 27a5afba16SPali Rohár #include <linux/hwmon.h> 28a5afba16SPali Rohár #include <linux/uaccess.h> 29a5afba16SPali Rohár #include <linux/io.h> 30a5afba16SPali Rohár #include <linux/sched.h> 31053ea640SPali Rohár #include <linux/ctype.h> 3227046a3fSJuergen Gross #include <linux/smp.h> 33a5afba16SPali Rohár 34a5afba16SPali Rohár #include <linux/i8k.h> 35a5afba16SPali Rohár 36a5afba16SPali Rohár #define I8K_SMM_FN_STATUS 0x0025 37a5afba16SPali Rohár #define I8K_SMM_POWER_STATUS 0x0069 38a5afba16SPali Rohár #define I8K_SMM_SET_FAN 0x01a3 39a5afba16SPali Rohár #define I8K_SMM_GET_FAN 0x00a3 40a5afba16SPali Rohár #define I8K_SMM_GET_SPEED 0x02a3 41a5afba16SPali Rohár #define I8K_SMM_GET_FAN_TYPE 0x03a3 42a5afba16SPali Rohár #define I8K_SMM_GET_NOM_SPEED 0x04a3 43a5afba16SPali Rohár #define I8K_SMM_GET_TEMP 0x10a3 44a5afba16SPali Rohár #define I8K_SMM_GET_TEMP_TYPE 0x11a3 45a5afba16SPali Rohár #define I8K_SMM_GET_DELL_SIG1 0xfea3 46a5afba16SPali Rohár #define I8K_SMM_GET_DELL_SIG2 0xffa3 47a5afba16SPali Rohár 48a5afba16SPali Rohár #define I8K_FAN_MULT 30 49a5afba16SPali Rohár #define I8K_FAN_MAX_RPM 30000 50a5afba16SPali Rohár #define I8K_MAX_TEMP 127 51a5afba16SPali Rohár 52a5afba16SPali Rohár #define I8K_FN_NONE 0x00 53a5afba16SPali Rohár #define I8K_FN_UP 0x01 54a5afba16SPali Rohár #define I8K_FN_DOWN 0x02 55a5afba16SPali Rohár #define I8K_FN_MUTE 0x04 56a5afba16SPali Rohár #define I8K_FN_MASK 0x07 57a5afba16SPali Rohár #define I8K_FN_SHIFT 8 58a5afba16SPali Rohár 59a5afba16SPali Rohár #define I8K_POWER_AC 0x05 60a5afba16SPali Rohár #define I8K_POWER_BATTERY 0x01 61a5afba16SPali Rohár 62deeba244SArmin Wolf #define DELL_SMM_NO_TEMP 10 63deeba244SArmin Wolf #define DELL_SMM_NO_FANS 3 64deeba244SArmin Wolf 65ba04d73cSArmin Wolf struct dell_smm_data { 66ba04d73cSArmin Wolf struct mutex i8k_mutex; /* lock for sensors writes */ 67ba04d73cSArmin Wolf char bios_version[4]; 68ba04d73cSArmin Wolf char bios_machineid[16]; 69ba04d73cSArmin Wolf uint i8k_fan_mult; 70ba04d73cSArmin Wolf uint i8k_pwm_mult; 71ba04d73cSArmin Wolf uint i8k_fan_max; 72ba04d73cSArmin Wolf bool disallow_fan_type_call; 73ba04d73cSArmin Wolf bool disallow_fan_support; 74ba04d73cSArmin Wolf unsigned int manual_fan; 75ba04d73cSArmin Wolf unsigned int auto_fan; 76deeba244SArmin Wolf int temp_type[DELL_SMM_NO_TEMP]; 77deeba244SArmin Wolf bool fan[DELL_SMM_NO_FANS]; 78deeba244SArmin Wolf int fan_type[DELL_SMM_NO_FANS]; 79ba04d73cSArmin Wolf }; 80a5afba16SPali Rohár 81a5afba16SPali Rohár MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)"); 82149ed3d4SPali Rohár MODULE_AUTHOR("Pali Rohár <pali@kernel.org>"); 83039ae585SPali Rohár MODULE_DESCRIPTION("Dell laptop SMM BIOS hwmon driver"); 84a5afba16SPali Rohár MODULE_LICENSE("GPL"); 85a5afba16SPali Rohár MODULE_ALIAS("i8k"); 86a5afba16SPali Rohár 87a5afba16SPali Rohár static bool force; 88a5afba16SPali Rohár module_param(force, bool, 0); 89a5afba16SPali Rohár MODULE_PARM_DESC(force, "Force loading without checking for supported models"); 90a5afba16SPali Rohár 91a5afba16SPali Rohár static bool ignore_dmi; 92a5afba16SPali Rohár module_param(ignore_dmi, bool, 0); 93a5afba16SPali Rohár MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match"); 94a5afba16SPali Rohár 95039ae585SPali Rohár #if IS_ENABLED(CONFIG_I8K) 967613663cSPali Rohár static bool restricted = true; 97a5afba16SPali Rohár module_param(restricted, bool, 0); 987613663cSPali Rohár MODULE_PARM_DESC(restricted, "Restrict fan control and serial number to CAP_SYS_ADMIN (default: 1)"); 99a5afba16SPali Rohár 100a5afba16SPali Rohár static bool power_status; 101a5afba16SPali Rohár module_param(power_status, bool, 0600); 1027613663cSPali Rohár MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k (default: 0)"); 103039ae585SPali Rohár #endif 104a5afba16SPali Rohár 105a5afba16SPali Rohár static uint fan_mult; 106a5afba16SPali Rohár module_param(fan_mult, uint, 0); 107a5afba16SPali Rohár MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)"); 108a5afba16SPali Rohár 109a5afba16SPali Rohár static uint fan_max; 110a5afba16SPali Rohár module_param(fan_max, uint, 0); 111a5afba16SPali Rohár MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)"); 112a5afba16SPali Rohár 113a5afba16SPali Rohár struct smm_regs { 114a5afba16SPali Rohár unsigned int eax; 115a5afba16SPali Rohár unsigned int ebx __packed; 116a5afba16SPali Rohár unsigned int ecx __packed; 117a5afba16SPali Rohár unsigned int edx __packed; 118a5afba16SPali Rohár unsigned int esi __packed; 119a5afba16SPali Rohár unsigned int edi __packed; 120a5afba16SPali Rohár }; 121a5afba16SPali Rohár 122deeba244SArmin Wolf static const char * const temp_labels[] = { 123deeba244SArmin Wolf "CPU", 124deeba244SArmin Wolf "GPU", 125deeba244SArmin Wolf "SODIMM", 126deeba244SArmin Wolf "Other", 127deeba244SArmin Wolf "Ambient", 128deeba244SArmin Wolf "Other", 129deeba244SArmin Wolf }; 130deeba244SArmin Wolf 131deeba244SArmin Wolf static const char * const fan_labels[] = { 132deeba244SArmin Wolf "Processor Fan", 133deeba244SArmin Wolf "Motherboard Fan", 134deeba244SArmin Wolf "Video Fan", 135deeba244SArmin Wolf "Power Supply Fan", 136deeba244SArmin Wolf "Chipset Fan", 137deeba244SArmin Wolf "Other Fan", 138deeba244SArmin Wolf }; 139deeba244SArmin Wolf 140deeba244SArmin Wolf static const char * const docking_labels[] = { 141deeba244SArmin Wolf "Docking Processor Fan", 142deeba244SArmin Wolf "Docking Motherboard Fan", 143deeba244SArmin Wolf "Docking Video Fan", 144deeba244SArmin Wolf "Docking Power Supply Fan", 145deeba244SArmin Wolf "Docking Chipset Fan", 146deeba244SArmin Wolf "Docking Other Fan", 147deeba244SArmin Wolf }; 148deeba244SArmin Wolf 149c9363cdfSArmin Wolf static inline const char __init *i8k_get_dmi_data(int field) 150a5afba16SPali Rohár { 151a5afba16SPali Rohár const char *dmi_data = dmi_get_system_info(field); 152a5afba16SPali Rohár 153a5afba16SPali Rohár return dmi_data && *dmi_data ? dmi_data : "?"; 154a5afba16SPali Rohár } 155a5afba16SPali Rohár 156a5afba16SPali Rohár /* 157a5afba16SPali Rohár * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard. 158a5afba16SPali Rohár */ 15927046a3fSJuergen Gross static int i8k_smm_func(void *par) 160a5afba16SPali Rohár { 161a5afba16SPali Rohár int rc; 16227046a3fSJuergen Gross struct smm_regs *regs = par; 163a5afba16SPali Rohár int eax = regs->eax; 164a5afba16SPali Rohár 1659d58bec0SPali Rohár #ifdef DEBUG 1669d58bec0SPali Rohár int ebx = regs->ebx; 1679d58bec0SPali Rohár unsigned long duration; 1689d58bec0SPali Rohár ktime_t calltime, delta, rettime; 1699d58bec0SPali Rohár 1709d58bec0SPali Rohár calltime = ktime_get(); 1719d58bec0SPali Rohár #endif 1729d58bec0SPali Rohár 173a5afba16SPali Rohár /* SMM requires CPU 0 */ 17427046a3fSJuergen Gross if (smp_processor_id() != 0) 17527046a3fSJuergen Gross return -EBUSY; 176a5afba16SPali Rohár 177a5afba16SPali Rohár #if defined(CONFIG_X86_64) 178a5afba16SPali Rohár asm volatile("pushq %%rax\n\t" 179a5afba16SPali Rohár "movl 0(%%rax),%%edx\n\t" 180a5afba16SPali Rohár "pushq %%rdx\n\t" 181a5afba16SPali Rohár "movl 4(%%rax),%%ebx\n\t" 182a5afba16SPali Rohár "movl 8(%%rax),%%ecx\n\t" 183a5afba16SPali Rohár "movl 12(%%rax),%%edx\n\t" 184a5afba16SPali Rohár "movl 16(%%rax),%%esi\n\t" 185a5afba16SPali Rohár "movl 20(%%rax),%%edi\n\t" 186a5afba16SPali Rohár "popq %%rax\n\t" 187a5afba16SPali Rohár "out %%al,$0xb2\n\t" 188a5afba16SPali Rohár "out %%al,$0x84\n\t" 189a5afba16SPali Rohár "xchgq %%rax,(%%rsp)\n\t" 190a5afba16SPali Rohár "movl %%ebx,4(%%rax)\n\t" 191a5afba16SPali Rohár "movl %%ecx,8(%%rax)\n\t" 192a5afba16SPali Rohár "movl %%edx,12(%%rax)\n\t" 193a5afba16SPali Rohár "movl %%esi,16(%%rax)\n\t" 194a5afba16SPali Rohár "movl %%edi,20(%%rax)\n\t" 195a5afba16SPali Rohár "popq %%rdx\n\t" 196a5afba16SPali Rohár "movl %%edx,0(%%rax)\n\t" 197a5afba16SPali Rohár "pushfq\n\t" 198a5afba16SPali Rohár "popq %%rax\n\t" 199a5afba16SPali Rohár "andl $1,%%eax\n" 200a5afba16SPali Rohár : "=a"(rc) 201a5afba16SPali Rohár : "a"(regs) 202a5afba16SPali Rohár : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory"); 203a5afba16SPali Rohár #else 204a5afba16SPali Rohár asm volatile("pushl %%eax\n\t" 205a5afba16SPali Rohár "movl 0(%%eax),%%edx\n\t" 206a5afba16SPali Rohár "push %%edx\n\t" 207a5afba16SPali Rohár "movl 4(%%eax),%%ebx\n\t" 208a5afba16SPali Rohár "movl 8(%%eax),%%ecx\n\t" 209a5afba16SPali Rohár "movl 12(%%eax),%%edx\n\t" 210a5afba16SPali Rohár "movl 16(%%eax),%%esi\n\t" 211a5afba16SPali Rohár "movl 20(%%eax),%%edi\n\t" 212a5afba16SPali Rohár "popl %%eax\n\t" 213a5afba16SPali Rohár "out %%al,$0xb2\n\t" 214a5afba16SPali Rohár "out %%al,$0x84\n\t" 215a5afba16SPali Rohár "xchgl %%eax,(%%esp)\n\t" 216a5afba16SPali Rohár "movl %%ebx,4(%%eax)\n\t" 217a5afba16SPali Rohár "movl %%ecx,8(%%eax)\n\t" 218a5afba16SPali Rohár "movl %%edx,12(%%eax)\n\t" 219a5afba16SPali Rohár "movl %%esi,16(%%eax)\n\t" 220a5afba16SPali Rohár "movl %%edi,20(%%eax)\n\t" 221a5afba16SPali Rohár "popl %%edx\n\t" 222a5afba16SPali Rohár "movl %%edx,0(%%eax)\n\t" 223a5afba16SPali Rohár "lahf\n\t" 224a5afba16SPali Rohár "shrl $8,%%eax\n\t" 225a5afba16SPali Rohár "andl $1,%%eax\n" 226a5afba16SPali Rohár : "=a"(rc) 227a5afba16SPali Rohár : "a"(regs) 228a5afba16SPali Rohár : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory"); 229a5afba16SPali Rohár #endif 230a5afba16SPali Rohár if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax) 231a5afba16SPali Rohár rc = -EINVAL; 232a5afba16SPali Rohár 2339d58bec0SPali Rohár #ifdef DEBUG 2349d58bec0SPali Rohár rettime = ktime_get(); 2359d58bec0SPali Rohár delta = ktime_sub(rettime, calltime); 2369d58bec0SPali Rohár duration = ktime_to_ns(delta) >> 10; 2379d58bec0SPali Rohár pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x (took %7lu usecs)\n", eax, ebx, 2389d58bec0SPali Rohár (rc ? 0xffff : regs->eax & 0xffff), duration); 2399d58bec0SPali Rohár #endif 2409d58bec0SPali Rohár 241a5afba16SPali Rohár return rc; 242a5afba16SPali Rohár } 243a5afba16SPali Rohár 244a5afba16SPali Rohár /* 24527046a3fSJuergen Gross * Call the System Management Mode BIOS. 24627046a3fSJuergen Gross */ 24727046a3fSJuergen Gross static int i8k_smm(struct smm_regs *regs) 24827046a3fSJuergen Gross { 24927046a3fSJuergen Gross int ret; 25027046a3fSJuergen Gross 251e104d530SSebastian Andrzej Siewior cpus_read_lock(); 25227046a3fSJuergen Gross ret = smp_call_on_cpu(0, i8k_smm_func, regs, true); 253e104d530SSebastian Andrzej Siewior cpus_read_unlock(); 25427046a3fSJuergen Gross 25527046a3fSJuergen Gross return ret; 25627046a3fSJuergen Gross } 25727046a3fSJuergen Gross 25827046a3fSJuergen Gross /* 259a5afba16SPali Rohár * Read the fan status. 260a5afba16SPali Rohár */ 261ba04d73cSArmin Wolf static int i8k_get_fan_status(const struct dell_smm_data *data, int fan) 262a5afba16SPali Rohár { 263a5afba16SPali Rohár struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, }; 264a5afba16SPali Rohár 265ba04d73cSArmin Wolf if (data->disallow_fan_support) 266f480ea90SPali Rohár return -EINVAL; 267f480ea90SPali Rohár 268a5afba16SPali Rohár regs.ebx = fan & 0xff; 269a5afba16SPali Rohár return i8k_smm(®s) ? : regs.eax & 0xff; 270a5afba16SPali Rohár } 271a5afba16SPali Rohár 272a5afba16SPali Rohár /* 273a5afba16SPali Rohár * Read the fan speed in RPM. 274a5afba16SPali Rohár */ 275ba04d73cSArmin Wolf static int i8k_get_fan_speed(const struct dell_smm_data *data, int fan) 276a5afba16SPali Rohár { 277a5afba16SPali Rohár struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, }; 278a5afba16SPali Rohár 279ba04d73cSArmin Wolf if (data->disallow_fan_support) 280f480ea90SPali Rohár return -EINVAL; 281f480ea90SPali Rohár 282a5afba16SPali Rohár regs.ebx = fan & 0xff; 283ba04d73cSArmin Wolf return i8k_smm(®s) ? : (regs.eax & 0xffff) * data->i8k_fan_mult; 284a5afba16SPali Rohár } 285a5afba16SPali Rohár 286a5afba16SPali Rohár /* 287a5afba16SPali Rohár * Read the fan type. 288a5afba16SPali Rohár */ 289ba04d73cSArmin Wolf static int _i8k_get_fan_type(const struct dell_smm_data *data, int fan) 290a5afba16SPali Rohár { 291a5afba16SPali Rohár struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, }; 292a5afba16SPali Rohár 293ba04d73cSArmin Wolf if (data->disallow_fan_support || data->disallow_fan_type_call) 2942744d2fdSPali Rohár return -EINVAL; 2952744d2fdSPali Rohár 296a5afba16SPali Rohár regs.ebx = fan & 0xff; 297a5afba16SPali Rohár return i8k_smm(®s) ? : regs.eax & 0xff; 298a5afba16SPali Rohár } 299a5afba16SPali Rohár 300ba04d73cSArmin Wolf static int i8k_get_fan_type(struct dell_smm_data *data, int fan) 3015ce91714SPali Rohár { 3025ce91714SPali Rohár /* I8K_SMM_GET_FAN_TYPE SMM call is expensive, so cache values */ 303deeba244SArmin Wolf if (data->fan_type[fan] == INT_MIN) 304deeba244SArmin Wolf data->fan_type[fan] = _i8k_get_fan_type(data, fan); 3055ce91714SPali Rohár 306deeba244SArmin Wolf return data->fan_type[fan]; 3075ce91714SPali Rohár } 3085ce91714SPali Rohár 309a5afba16SPali Rohár /* 310a5afba16SPali Rohár * Read the fan nominal rpm for specific fan speed. 311a5afba16SPali Rohár */ 312*782a99c1SArmin Wolf static int __init i8k_get_fan_nominal_speed(const struct dell_smm_data *data, int fan, int speed) 313a5afba16SPali Rohár { 314a5afba16SPali Rohár struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, }; 315a5afba16SPali Rohár 316ba04d73cSArmin Wolf if (data->disallow_fan_support) 317f480ea90SPali Rohár return -EINVAL; 318f480ea90SPali Rohár 319a5afba16SPali Rohár regs.ebx = (fan & 0xff) | (speed << 8); 320ba04d73cSArmin Wolf return i8k_smm(®s) ? : (regs.eax & 0xffff) * data->i8k_fan_mult; 321a5afba16SPali Rohár } 322a5afba16SPali Rohár 323a5afba16SPali Rohár /* 324afe45277SGiovanni Mascellani * Enable or disable automatic BIOS fan control support 325afe45277SGiovanni Mascellani */ 326ba04d73cSArmin Wolf static int i8k_enable_fan_auto_mode(const struct dell_smm_data *data, bool enable) 327afe45277SGiovanni Mascellani { 328afe45277SGiovanni Mascellani struct smm_regs regs = { }; 329afe45277SGiovanni Mascellani 330ba04d73cSArmin Wolf if (data->disallow_fan_support) 331afe45277SGiovanni Mascellani return -EINVAL; 332afe45277SGiovanni Mascellani 333ba04d73cSArmin Wolf regs.eax = enable ? data->auto_fan : data->manual_fan; 334afe45277SGiovanni Mascellani return i8k_smm(®s); 335afe45277SGiovanni Mascellani } 336afe45277SGiovanni Mascellani 337afe45277SGiovanni Mascellani /* 338a5afba16SPali Rohár * Set the fan speed (off, low, high). Returns the new fan status. 339a5afba16SPali Rohár */ 340ba04d73cSArmin Wolf static int i8k_set_fan(const struct dell_smm_data *data, int fan, int speed) 341a5afba16SPali Rohár { 342a5afba16SPali Rohár struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, }; 343a5afba16SPali Rohár 344ba04d73cSArmin Wolf if (data->disallow_fan_support) 345f480ea90SPali Rohár return -EINVAL; 346f480ea90SPali Rohár 347ba04d73cSArmin Wolf speed = (speed < 0) ? 0 : ((speed > data->i8k_fan_max) ? data->i8k_fan_max : speed); 348a5afba16SPali Rohár regs.ebx = (fan & 0xff) | (speed << 8); 349a5afba16SPali Rohár 350ba04d73cSArmin Wolf return i8k_smm(®s) ? : i8k_get_fan_status(data, fan); 351a5afba16SPali Rohár } 352a5afba16SPali Rohár 353deeba244SArmin Wolf static int __init i8k_get_temp_type(int sensor) 354a5afba16SPali Rohár { 355a5afba16SPali Rohár struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, }; 356a5afba16SPali Rohár 357a5afba16SPali Rohár regs.ebx = sensor & 0xff; 358a5afba16SPali Rohár return i8k_smm(®s) ? : regs.eax & 0xff; 359a5afba16SPali Rohár } 360a5afba16SPali Rohár 361a5afba16SPali Rohár /* 362a5afba16SPali Rohár * Read the cpu temperature. 363a5afba16SPali Rohár */ 364a5afba16SPali Rohár static int _i8k_get_temp(int sensor) 365a5afba16SPali Rohár { 366a5afba16SPali Rohár struct smm_regs regs = { 367a5afba16SPali Rohár .eax = I8K_SMM_GET_TEMP, 368a5afba16SPali Rohár .ebx = sensor & 0xff, 369a5afba16SPali Rohár }; 370a5afba16SPali Rohár 371a5afba16SPali Rohár return i8k_smm(®s) ? : regs.eax & 0xff; 372a5afba16SPali Rohár } 373a5afba16SPali Rohár 374a5afba16SPali Rohár static int i8k_get_temp(int sensor) 375a5afba16SPali Rohár { 376a5afba16SPali Rohár int temp = _i8k_get_temp(sensor); 377a5afba16SPali Rohár 378a5afba16SPali Rohár /* 379a5afba16SPali Rohár * Sometimes the temperature sensor returns 0x99, which is out of range. 380a5afba16SPali Rohár * In this case we retry (once) before returning an error. 381a5afba16SPali Rohár # 1003655137 00000058 00005a4b 382a5afba16SPali Rohár # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees 383a5afba16SPali Rohár # 1003655139 00000054 00005c52 384a5afba16SPali Rohár */ 385a5afba16SPali Rohár if (temp == 0x99) { 386a5afba16SPali Rohár msleep(100); 387a5afba16SPali Rohár temp = _i8k_get_temp(sensor); 388a5afba16SPali Rohár } 389a5afba16SPali Rohár /* 390a5afba16SPali Rohár * Return -ENODATA for all invalid temperatures. 391a5afba16SPali Rohár * 392a5afba16SPali Rohár * Known instances are the 0x99 value as seen above as well as 393a5afba16SPali Rohár * 0xc1 (193), which may be returned when trying to read the GPU 394a5afba16SPali Rohár * temperature if the system supports a GPU and it is currently 395a5afba16SPali Rohár * turned off. 396a5afba16SPali Rohár */ 397a5afba16SPali Rohár if (temp > I8K_MAX_TEMP) 398a5afba16SPali Rohár return -ENODATA; 399a5afba16SPali Rohár 400a5afba16SPali Rohár return temp; 401a5afba16SPali Rohár } 402a5afba16SPali Rohár 403c9363cdfSArmin Wolf static int __init i8k_get_dell_signature(int req_fn) 404a5afba16SPali Rohár { 405a5afba16SPali Rohár struct smm_regs regs = { .eax = req_fn, }; 406a5afba16SPali Rohár int rc; 407a5afba16SPali Rohár 408a5afba16SPali Rohár rc = i8k_smm(®s); 409a5afba16SPali Rohár if (rc < 0) 410a5afba16SPali Rohár return rc; 411a5afba16SPali Rohár 412a5afba16SPali Rohár return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1; 413a5afba16SPali Rohár } 414a5afba16SPali Rohár 415039ae585SPali Rohár #if IS_ENABLED(CONFIG_I8K) 416039ae585SPali Rohár 417039ae585SPali Rohár /* 418039ae585SPali Rohár * Read the Fn key status. 419039ae585SPali Rohár */ 420039ae585SPali Rohár static int i8k_get_fn_status(void) 421039ae585SPali Rohár { 422039ae585SPali Rohár struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, }; 423039ae585SPali Rohár int rc; 424039ae585SPali Rohár 425039ae585SPali Rohár rc = i8k_smm(®s); 426039ae585SPali Rohár if (rc < 0) 427039ae585SPali Rohár return rc; 428039ae585SPali Rohár 429039ae585SPali Rohár switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) { 430039ae585SPali Rohár case I8K_FN_UP: 431039ae585SPali Rohár return I8K_VOL_UP; 432039ae585SPali Rohár case I8K_FN_DOWN: 433039ae585SPali Rohár return I8K_VOL_DOWN; 434039ae585SPali Rohár case I8K_FN_MUTE: 435039ae585SPali Rohár return I8K_VOL_MUTE; 436039ae585SPali Rohár default: 437039ae585SPali Rohár return 0; 438039ae585SPali Rohár } 439039ae585SPali Rohár } 440039ae585SPali Rohár 441039ae585SPali Rohár /* 442039ae585SPali Rohár * Read the power status. 443039ae585SPali Rohár */ 444039ae585SPali Rohár static int i8k_get_power_status(void) 445039ae585SPali Rohár { 446039ae585SPali Rohár struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, }; 447039ae585SPali Rohár int rc; 448039ae585SPali Rohár 449039ae585SPali Rohár rc = i8k_smm(®s); 450039ae585SPali Rohár if (rc < 0) 451039ae585SPali Rohár return rc; 452039ae585SPali Rohár 453039ae585SPali Rohár return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY; 454039ae585SPali Rohár } 455039ae585SPali Rohár 456039ae585SPali Rohár /* 457039ae585SPali Rohár * Procfs interface 458039ae585SPali Rohár */ 459039ae585SPali Rohár 460a5afba16SPali Rohár static int 461ba04d73cSArmin Wolf i8k_ioctl_unlocked(struct file *fp, struct dell_smm_data *data, unsigned int cmd, unsigned long arg) 462a5afba16SPali Rohár { 463a5afba16SPali Rohár int val = 0; 464a5afba16SPali Rohár int speed; 465a5afba16SPali Rohár unsigned char buff[16]; 466a5afba16SPali Rohár int __user *argp = (int __user *)arg; 467a5afba16SPali Rohár 468a5afba16SPali Rohár if (!argp) 469a5afba16SPali Rohár return -EINVAL; 470a5afba16SPali Rohár 471a5afba16SPali Rohár switch (cmd) { 472a5afba16SPali Rohár case I8K_BIOS_VERSION: 473ba04d73cSArmin Wolf if (!isdigit(data->bios_version[0]) || !isdigit(data->bios_version[1]) || 474ba04d73cSArmin Wolf !isdigit(data->bios_version[2])) 475053ea640SPali Rohár return -EINVAL; 476053ea640SPali Rohár 477ba04d73cSArmin Wolf val = (data->bios_version[0] << 16) | 478ba04d73cSArmin Wolf (data->bios_version[1] << 8) | data->bios_version[2]; 479a5afba16SPali Rohár break; 480a5afba16SPali Rohár 481a5afba16SPali Rohár case I8K_MACHINE_ID: 4827613663cSPali Rohár if (restricted && !capable(CAP_SYS_ADMIN)) 4837613663cSPali Rohár return -EPERM; 4847613663cSPali Rohár 4857613663cSPali Rohár memset(buff, 0, sizeof(buff)); 486ba04d73cSArmin Wolf strscpy(buff, data->bios_machineid, sizeof(buff)); 487a5afba16SPali Rohár break; 488a5afba16SPali Rohár 489a5afba16SPali Rohár case I8K_FN_STATUS: 490a5afba16SPali Rohár val = i8k_get_fn_status(); 491a5afba16SPali Rohár break; 492a5afba16SPali Rohár 493a5afba16SPali Rohár case I8K_POWER_STATUS: 494a5afba16SPali Rohár val = i8k_get_power_status(); 495a5afba16SPali Rohár break; 496a5afba16SPali Rohár 497a5afba16SPali Rohár case I8K_GET_TEMP: 498a5afba16SPali Rohár val = i8k_get_temp(0); 499a5afba16SPali Rohár break; 500a5afba16SPali Rohár 501a5afba16SPali Rohár case I8K_GET_SPEED: 502a5afba16SPali Rohár if (copy_from_user(&val, argp, sizeof(int))) 503a5afba16SPali Rohár return -EFAULT; 504a5afba16SPali Rohár 505ba04d73cSArmin Wolf val = i8k_get_fan_speed(data, val); 506a5afba16SPali Rohár break; 507a5afba16SPali Rohár 508a5afba16SPali Rohár case I8K_GET_FAN: 509a5afba16SPali Rohár if (copy_from_user(&val, argp, sizeof(int))) 510a5afba16SPali Rohár return -EFAULT; 511a5afba16SPali Rohár 512ba04d73cSArmin Wolf val = i8k_get_fan_status(data, val); 513a5afba16SPali Rohár break; 514a5afba16SPali Rohár 515a5afba16SPali Rohár case I8K_SET_FAN: 516a5afba16SPali Rohár if (restricted && !capable(CAP_SYS_ADMIN)) 517a5afba16SPali Rohár return -EPERM; 518a5afba16SPali Rohár 519a5afba16SPali Rohár if (copy_from_user(&val, argp, sizeof(int))) 520a5afba16SPali Rohár return -EFAULT; 521a5afba16SPali Rohár 522a5afba16SPali Rohár if (copy_from_user(&speed, argp + 1, sizeof(int))) 523a5afba16SPali Rohár return -EFAULT; 524a5afba16SPali Rohár 525ba04d73cSArmin Wolf val = i8k_set_fan(data, val, speed); 526a5afba16SPali Rohár break; 527a5afba16SPali Rohár 528a5afba16SPali Rohár default: 529a5afba16SPali Rohár return -EINVAL; 530a5afba16SPali Rohár } 531a5afba16SPali Rohár 532a5afba16SPali Rohár if (val < 0) 533a5afba16SPali Rohár return val; 534a5afba16SPali Rohár 535a5afba16SPali Rohár switch (cmd) { 536a5afba16SPali Rohár case I8K_BIOS_VERSION: 537a5afba16SPali Rohár if (copy_to_user(argp, &val, 4)) 538a5afba16SPali Rohár return -EFAULT; 539a5afba16SPali Rohár 540a5afba16SPali Rohár break; 541a5afba16SPali Rohár case I8K_MACHINE_ID: 542a5afba16SPali Rohár if (copy_to_user(argp, buff, 16)) 543a5afba16SPali Rohár return -EFAULT; 544a5afba16SPali Rohár 545a5afba16SPali Rohár break; 546a5afba16SPali Rohár default: 547a5afba16SPali Rohár if (copy_to_user(argp, &val, sizeof(int))) 548a5afba16SPali Rohár return -EFAULT; 549a5afba16SPali Rohár 550a5afba16SPali Rohár break; 551a5afba16SPali Rohár } 552a5afba16SPali Rohár 553a5afba16SPali Rohár return 0; 554a5afba16SPali Rohár } 555a5afba16SPali Rohár 556a5afba16SPali Rohár static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) 557a5afba16SPali Rohár { 558ba04d73cSArmin Wolf struct dell_smm_data *data = PDE_DATA(file_inode(fp)); 559a5afba16SPali Rohár long ret; 560a5afba16SPali Rohár 561ba04d73cSArmin Wolf mutex_lock(&data->i8k_mutex); 562ba04d73cSArmin Wolf ret = i8k_ioctl_unlocked(fp, data, cmd, arg); 563ba04d73cSArmin Wolf mutex_unlock(&data->i8k_mutex); 564a5afba16SPali Rohár 565a5afba16SPali Rohár return ret; 566a5afba16SPali Rohár } 567a5afba16SPali Rohár 568a5afba16SPali Rohár /* 569a5afba16SPali Rohár * Print the information for /proc/i8k. 570a5afba16SPali Rohár */ 571a5afba16SPali Rohár static int i8k_proc_show(struct seq_file *seq, void *offset) 572a5afba16SPali Rohár { 573ba04d73cSArmin Wolf struct dell_smm_data *data = seq->private; 574a5afba16SPali Rohár int fn_key, cpu_temp, ac_power; 575a5afba16SPali Rohár int left_fan, right_fan, left_speed, right_speed; 576a5afba16SPali Rohár 577a5afba16SPali Rohár cpu_temp = i8k_get_temp(0); /* 11100 µs */ 578ba04d73cSArmin Wolf left_fan = i8k_get_fan_status(data, I8K_FAN_LEFT); /* 580 µs */ 579ba04d73cSArmin Wolf right_fan = i8k_get_fan_status(data, I8K_FAN_RIGHT); /* 580 µs */ 580ba04d73cSArmin Wolf left_speed = i8k_get_fan_speed(data, I8K_FAN_LEFT); /* 580 µs */ 581ba04d73cSArmin Wolf right_speed = i8k_get_fan_speed(data, I8K_FAN_RIGHT); /* 580 µs */ 582a5afba16SPali Rohár fn_key = i8k_get_fn_status(); /* 750 µs */ 583a5afba16SPali Rohár if (power_status) 584a5afba16SPali Rohár ac_power = i8k_get_power_status(); /* 14700 µs */ 585a5afba16SPali Rohár else 586a5afba16SPali Rohár ac_power = -1; 587a5afba16SPali Rohár 588a5afba16SPali Rohár /* 589a5afba16SPali Rohár * Info: 590a5afba16SPali Rohár * 591a5afba16SPali Rohár * 1) Format version (this will change if format changes) 592a5afba16SPali Rohár * 2) BIOS version 593a5afba16SPali Rohár * 3) BIOS machine ID 594a5afba16SPali Rohár * 4) Cpu temperature 595a5afba16SPali Rohár * 5) Left fan status 596a5afba16SPali Rohár * 6) Right fan status 597a5afba16SPali Rohár * 7) Left fan speed 598a5afba16SPali Rohár * 8) Right fan speed 599a5afba16SPali Rohár * 9) AC power 600a5afba16SPali Rohár * 10) Fn Key status 601a5afba16SPali Rohár */ 602a5afba16SPali Rohár seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n", 603a5afba16SPali Rohár I8K_PROC_FMT, 604ba04d73cSArmin Wolf data->bios_version, 605ba04d73cSArmin Wolf (restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : data->bios_machineid, 606a5afba16SPali Rohár cpu_temp, 607a5afba16SPali Rohár left_fan, right_fan, left_speed, right_speed, 608a5afba16SPali Rohár ac_power, fn_key); 609a5afba16SPali Rohár 610a5afba16SPali Rohár return 0; 611a5afba16SPali Rohár } 612a5afba16SPali Rohár 613a5afba16SPali Rohár static int i8k_open_fs(struct inode *inode, struct file *file) 614a5afba16SPali Rohár { 615ba04d73cSArmin Wolf return single_open(file, i8k_proc_show, PDE_DATA(inode)); 616a5afba16SPali Rohár } 617a5afba16SPali Rohár 61897a32539SAlexey Dobriyan static const struct proc_ops i8k_proc_ops = { 61997a32539SAlexey Dobriyan .proc_open = i8k_open_fs, 62097a32539SAlexey Dobriyan .proc_read = seq_read, 62197a32539SAlexey Dobriyan .proc_lseek = seq_lseek, 62297a32539SAlexey Dobriyan .proc_release = single_release, 62397a32539SAlexey Dobriyan .proc_ioctl = i8k_ioctl, 624039ae585SPali Rohár }; 625039ae585SPali Rohár 626a2cb66b4SArmin Wolf static void i8k_exit_procfs(void *param) 627039ae585SPali Rohár { 628039ae585SPali Rohár remove_proc_entry("i8k", NULL); 629039ae585SPali Rohár } 630039ae585SPali Rohár 631a2cb66b4SArmin Wolf static void __init i8k_init_procfs(struct device *dev) 632039ae585SPali Rohár { 633ba04d73cSArmin Wolf struct dell_smm_data *data = dev_get_drvdata(dev); 634ba04d73cSArmin Wolf 635a2cb66b4SArmin Wolf /* Register the proc entry */ 636ba04d73cSArmin Wolf proc_create_data("i8k", 0, NULL, &i8k_proc_ops, data); 637a2cb66b4SArmin Wolf 638a2cb66b4SArmin Wolf devm_add_action_or_reset(dev, i8k_exit_procfs, NULL); 639039ae585SPali Rohár } 640039ae585SPali Rohár 641a2cb66b4SArmin Wolf #else 642a2cb66b4SArmin Wolf 643a2cb66b4SArmin Wolf static void __init i8k_init_procfs(struct device *dev) 644039ae585SPali Rohár { 645039ae585SPali Rohár } 646039ae585SPali Rohár 647039ae585SPali Rohár #endif 648a5afba16SPali Rohár 649a5afba16SPali Rohár /* 650a5afba16SPali Rohár * Hwmon interface 651a5afba16SPali Rohár */ 652a5afba16SPali Rohár 653deeba244SArmin Wolf static umode_t dell_smm_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr, 654deeba244SArmin Wolf int channel) 655a5afba16SPali Rohár { 656deeba244SArmin Wolf const struct dell_smm_data *data = drvdata; 657a5afba16SPali Rohár 658deeba244SArmin Wolf switch (type) { 659deeba244SArmin Wolf case hwmon_temp: 660deeba244SArmin Wolf switch (attr) { 661deeba244SArmin Wolf case hwmon_temp_input: 662deeba244SArmin Wolf case hwmon_temp_label: 663deeba244SArmin Wolf if (data->temp_type[channel] >= 0) 664deeba244SArmin Wolf return 0444; 665deeba244SArmin Wolf 666deeba244SArmin Wolf break; 667deeba244SArmin Wolf default: 668deeba244SArmin Wolf break; 669deeba244SArmin Wolf } 670deeba244SArmin Wolf break; 671deeba244SArmin Wolf case hwmon_fan: 672deeba244SArmin Wolf if (data->disallow_fan_support) 673deeba244SArmin Wolf break; 674deeba244SArmin Wolf 675deeba244SArmin Wolf switch (attr) { 676deeba244SArmin Wolf case hwmon_fan_input: 677deeba244SArmin Wolf if (data->fan[channel]) 678deeba244SArmin Wolf return 0444; 679deeba244SArmin Wolf 680deeba244SArmin Wolf break; 681deeba244SArmin Wolf case hwmon_fan_label: 682deeba244SArmin Wolf if (data->fan[channel] && !data->disallow_fan_type_call) 683deeba244SArmin Wolf return 0444; 684deeba244SArmin Wolf 685deeba244SArmin Wolf break; 686deeba244SArmin Wolf default: 687deeba244SArmin Wolf break; 688deeba244SArmin Wolf } 689deeba244SArmin Wolf break; 690deeba244SArmin Wolf case hwmon_pwm: 691deeba244SArmin Wolf if (data->disallow_fan_support) 692deeba244SArmin Wolf break; 693deeba244SArmin Wolf 694deeba244SArmin Wolf switch (attr) { 695deeba244SArmin Wolf case hwmon_pwm_input: 696deeba244SArmin Wolf if (data->fan[channel]) 697deeba244SArmin Wolf return 0644; 698deeba244SArmin Wolf 699deeba244SArmin Wolf break; 700deeba244SArmin Wolf case hwmon_pwm_enable: 701deeba244SArmin Wolf if (data->auto_fan) 702deeba244SArmin Wolf /* 703deeba244SArmin Wolf * There is no command for retrieve the current status 704deeba244SArmin Wolf * from BIOS, and userspace/firmware itself can change 705deeba244SArmin Wolf * it. 706deeba244SArmin Wolf * Thus we can only provide write-only access for now. 707deeba244SArmin Wolf */ 708deeba244SArmin Wolf return 0200; 709deeba244SArmin Wolf 710deeba244SArmin Wolf break; 711deeba244SArmin Wolf default: 712deeba244SArmin Wolf break; 713deeba244SArmin Wolf } 714deeba244SArmin Wolf break; 715deeba244SArmin Wolf default: 716deeba244SArmin Wolf break; 717a5afba16SPali Rohár } 718a5afba16SPali Rohár 719deeba244SArmin Wolf return 0; 720a5afba16SPali Rohár } 721a5afba16SPali Rohár 722deeba244SArmin Wolf static int dell_smm_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, 723deeba244SArmin Wolf long *val) 724a5afba16SPali Rohár { 725ba04d73cSArmin Wolf struct dell_smm_data *data = dev_get_drvdata(dev); 726deeba244SArmin Wolf int ret; 727a5afba16SPali Rohár 728deeba244SArmin Wolf switch (type) { 729deeba244SArmin Wolf case hwmon_temp: 730deeba244SArmin Wolf switch (attr) { 731deeba244SArmin Wolf case hwmon_temp_input: 732deeba244SArmin Wolf ret = i8k_get_temp(channel); 733deeba244SArmin Wolf if (ret < 0) 734deeba244SArmin Wolf return ret; 735deeba244SArmin Wolf 736deeba244SArmin Wolf *val = ret * 1000; 737deeba244SArmin Wolf 738deeba244SArmin Wolf return 0; 739deeba244SArmin Wolf default: 740deeba244SArmin Wolf break; 741deeba244SArmin Wolf } 742deeba244SArmin Wolf break; 743deeba244SArmin Wolf case hwmon_fan: 744deeba244SArmin Wolf switch (attr) { 745deeba244SArmin Wolf case hwmon_fan_input: 746deeba244SArmin Wolf ret = i8k_get_fan_speed(data, channel); 747deeba244SArmin Wolf if (ret < 0) 748deeba244SArmin Wolf return ret; 749deeba244SArmin Wolf 750deeba244SArmin Wolf *val = ret; 751deeba244SArmin Wolf 752deeba244SArmin Wolf return 0; 753deeba244SArmin Wolf default: 754deeba244SArmin Wolf break; 755deeba244SArmin Wolf } 756deeba244SArmin Wolf break; 757deeba244SArmin Wolf case hwmon_pwm: 758deeba244SArmin Wolf switch (attr) { 759deeba244SArmin Wolf case hwmon_pwm_input: 760deeba244SArmin Wolf ret = i8k_get_fan_status(data, channel); 761deeba244SArmin Wolf if (ret < 0) 762deeba244SArmin Wolf return ret; 763deeba244SArmin Wolf 764deeba244SArmin Wolf *val = clamp_val(ret * data->i8k_pwm_mult, 0, 255); 765deeba244SArmin Wolf 766deeba244SArmin Wolf return 0; 767deeba244SArmin Wolf default: 768deeba244SArmin Wolf break; 769deeba244SArmin Wolf } 770deeba244SArmin Wolf break; 771deeba244SArmin Wolf default: 772deeba244SArmin Wolf break; 773deeba244SArmin Wolf } 774deeba244SArmin Wolf 775deeba244SArmin Wolf return -EOPNOTSUPP; 776deeba244SArmin Wolf } 777deeba244SArmin Wolf 778deeba244SArmin Wolf static const char *dell_smm_fan_label(struct dell_smm_data *data, int channel) 779deeba244SArmin Wolf { 780deeba244SArmin Wolf bool dock = false; 781deeba244SArmin Wolf int type = i8k_get_fan_type(data, channel); 782deeba244SArmin Wolf 783a5afba16SPali Rohár if (type < 0) 784deeba244SArmin Wolf return ERR_PTR(type); 785a5afba16SPali Rohár 786a5afba16SPali Rohár if (type & 0x10) { 787a5afba16SPali Rohár dock = true; 788a5afba16SPali Rohár type &= 0x0F; 789a5afba16SPali Rohár } 790a5afba16SPali Rohár 791deeba244SArmin Wolf if (type >= ARRAY_SIZE(fan_labels)) 792deeba244SArmin Wolf type = ARRAY_SIZE(fan_labels) - 1; 793a5afba16SPali Rohár 794deeba244SArmin Wolf return dock ? docking_labels[type] : fan_labels[type]; 795a5afba16SPali Rohár } 796a5afba16SPali Rohár 797deeba244SArmin Wolf static int dell_smm_read_string(struct device *dev, enum hwmon_sensor_types type, u32 attr, 798deeba244SArmin Wolf int channel, const char **str) 799a5afba16SPali Rohár { 800ba04d73cSArmin Wolf struct dell_smm_data *data = dev_get_drvdata(dev); 801a5afba16SPali Rohár 802deeba244SArmin Wolf switch (type) { 803deeba244SArmin Wolf case hwmon_temp: 804deeba244SArmin Wolf switch (attr) { 805deeba244SArmin Wolf case hwmon_temp_label: 806deeba244SArmin Wolf *str = temp_labels[data->temp_type[channel]]; 807deeba244SArmin Wolf return 0; 808deeba244SArmin Wolf default: 809deeba244SArmin Wolf break; 810deeba244SArmin Wolf } 811deeba244SArmin Wolf break; 812deeba244SArmin Wolf case hwmon_fan: 813deeba244SArmin Wolf switch (attr) { 814deeba244SArmin Wolf case hwmon_fan_label: 815deeba244SArmin Wolf *str = dell_smm_fan_label(data, channel); 816deeba244SArmin Wolf return PTR_ERR_OR_ZERO(*str); 817deeba244SArmin Wolf default: 818deeba244SArmin Wolf break; 819deeba244SArmin Wolf } 820deeba244SArmin Wolf break; 821deeba244SArmin Wolf default: 822deeba244SArmin Wolf break; 823a5afba16SPali Rohár } 824a5afba16SPali Rohár 825deeba244SArmin Wolf return -EOPNOTSUPP; 826a5afba16SPali Rohár } 827a5afba16SPali Rohár 828deeba244SArmin Wolf static int dell_smm_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, 829deeba244SArmin Wolf long val) 830a5afba16SPali Rohár { 831ba04d73cSArmin Wolf struct dell_smm_data *data = dev_get_drvdata(dev); 832deeba244SArmin Wolf unsigned long pwm; 833deeba244SArmin Wolf bool enable; 834a5afba16SPali Rohár int err; 835a5afba16SPali Rohár 836deeba244SArmin Wolf switch (type) { 837deeba244SArmin Wolf case hwmon_pwm: 838deeba244SArmin Wolf switch (attr) { 839deeba244SArmin Wolf case hwmon_pwm_input: 840deeba244SArmin Wolf pwm = clamp_val(DIV_ROUND_CLOSEST(val, data->i8k_pwm_mult), 0, 841deeba244SArmin Wolf data->i8k_fan_max); 842a5afba16SPali Rohár 843ba04d73cSArmin Wolf mutex_lock(&data->i8k_mutex); 844deeba244SArmin Wolf err = i8k_set_fan(data, channel, pwm); 845ba04d73cSArmin Wolf mutex_unlock(&data->i8k_mutex); 846a5afba16SPali Rohár 847deeba244SArmin Wolf if (err < 0) 848afe45277SGiovanni Mascellani return err; 849afe45277SGiovanni Mascellani 850deeba244SArmin Wolf return 0; 851deeba244SArmin Wolf case hwmon_pwm_enable: 852deeba244SArmin Wolf if (!val) 853deeba244SArmin Wolf return -EINVAL; 854deeba244SArmin Wolf 855afe45277SGiovanni Mascellani if (val == 1) 856afe45277SGiovanni Mascellani enable = false; 857afe45277SGiovanni Mascellani else 858deeba244SArmin Wolf enable = true; 859afe45277SGiovanni Mascellani 860ba04d73cSArmin Wolf mutex_lock(&data->i8k_mutex); 861ba04d73cSArmin Wolf err = i8k_enable_fan_auto_mode(data, enable); 862ba04d73cSArmin Wolf mutex_unlock(&data->i8k_mutex); 863afe45277SGiovanni Mascellani 864deeba244SArmin Wolf if (err < 0) 865deeba244SArmin Wolf return err; 866deeba244SArmin Wolf 867deeba244SArmin Wolf return 0; 868deeba244SArmin Wolf default: 869deeba244SArmin Wolf break; 870deeba244SArmin Wolf } 871deeba244SArmin Wolf break; 872deeba244SArmin Wolf default: 873deeba244SArmin Wolf break; 874afe45277SGiovanni Mascellani } 875afe45277SGiovanni Mascellani 876deeba244SArmin Wolf return -EOPNOTSUPP; 877deeba244SArmin Wolf } 878a5afba16SPali Rohár 879deeba244SArmin Wolf static const struct hwmon_ops dell_smm_ops = { 880deeba244SArmin Wolf .is_visible = dell_smm_is_visible, 881deeba244SArmin Wolf .read = dell_smm_read, 882deeba244SArmin Wolf .read_string = dell_smm_read_string, 883deeba244SArmin Wolf .write = dell_smm_write, 884deeba244SArmin Wolf }; 885deeba244SArmin Wolf 886deeba244SArmin Wolf static const struct hwmon_channel_info *dell_smm_info[] = { 887deeba244SArmin Wolf HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ), 888deeba244SArmin Wolf HWMON_CHANNEL_INFO(temp, 889deeba244SArmin Wolf HWMON_T_INPUT | HWMON_T_LABEL, 890deeba244SArmin Wolf HWMON_T_INPUT | HWMON_T_LABEL, 891deeba244SArmin Wolf HWMON_T_INPUT | HWMON_T_LABEL, 892deeba244SArmin Wolf HWMON_T_INPUT | HWMON_T_LABEL, 893deeba244SArmin Wolf HWMON_T_INPUT | HWMON_T_LABEL, 894deeba244SArmin Wolf HWMON_T_INPUT | HWMON_T_LABEL, 895deeba244SArmin Wolf HWMON_T_INPUT | HWMON_T_LABEL, 896deeba244SArmin Wolf HWMON_T_INPUT | HWMON_T_LABEL, 897deeba244SArmin Wolf HWMON_T_INPUT | HWMON_T_LABEL, 898deeba244SArmin Wolf HWMON_T_INPUT | HWMON_T_LABEL 899deeba244SArmin Wolf ), 900deeba244SArmin Wolf HWMON_CHANNEL_INFO(fan, 901deeba244SArmin Wolf HWMON_F_INPUT | HWMON_F_LABEL, 902deeba244SArmin Wolf HWMON_F_INPUT | HWMON_F_LABEL, 903deeba244SArmin Wolf HWMON_F_INPUT | HWMON_F_LABEL 904deeba244SArmin Wolf ), 905deeba244SArmin Wolf HWMON_CHANNEL_INFO(pwm, 906deeba244SArmin Wolf HWMON_PWM_INPUT | HWMON_PWM_ENABLE, 907deeba244SArmin Wolf HWMON_PWM_INPUT, 908deeba244SArmin Wolf HWMON_PWM_INPUT 909deeba244SArmin Wolf ), 910a5afba16SPali Rohár NULL 911a5afba16SPali Rohár }; 912a5afba16SPali Rohár 913deeba244SArmin Wolf static const struct hwmon_chip_info dell_smm_chip_info = { 914deeba244SArmin Wolf .ops = &dell_smm_ops, 915deeba244SArmin Wolf .info = dell_smm_info, 916a5afba16SPali Rohár }; 917a5afba16SPali Rohár 9181492fa21SArmin Wolf static int __init dell_smm_init_hwmon(struct device *dev) 919a5afba16SPali Rohár { 920ba04d73cSArmin Wolf struct dell_smm_data *data = dev_get_drvdata(dev); 921deeba244SArmin Wolf struct device *dell_smm_hwmon_dev; 922deeba244SArmin Wolf int i, err; 923a5afba16SPali Rohár 924deeba244SArmin Wolf for (i = 0; i < DELL_SMM_NO_TEMP; i++) { 925deeba244SArmin Wolf data->temp_type[i] = i8k_get_temp_type(i); 926deeba244SArmin Wolf if (data->temp_type[i] < 0) 927deeba244SArmin Wolf continue; 928a5afba16SPali Rohár 929deeba244SArmin Wolf if (data->temp_type[i] >= ARRAY_SIZE(temp_labels)) 930deeba244SArmin Wolf data->temp_type[i] = ARRAY_SIZE(temp_labels) - 1; 931deeba244SArmin Wolf } 932deeba244SArmin Wolf 933deeba244SArmin Wolf for (i = 0; i < DELL_SMM_NO_FANS; i++) { 934deeba244SArmin Wolf data->fan_type[i] = INT_MIN; 935deeba244SArmin Wolf err = i8k_get_fan_status(data, i); 9365ce91714SPali Rohár if (err < 0) 937deeba244SArmin Wolf err = i8k_get_fan_type(data, i); 938a5afba16SPali Rohár if (err >= 0) 939deeba244SArmin Wolf data->fan[i] = true; 940deeba244SArmin Wolf } 941a5afba16SPali Rohár 942deeba244SArmin Wolf dell_smm_hwmon_dev = devm_hwmon_device_register_with_info(dev, "dell_smm", data, 943deeba244SArmin Wolf &dell_smm_chip_info, NULL); 944a5afba16SPali Rohár 945deeba244SArmin Wolf return PTR_ERR_OR_ZERO(dell_smm_hwmon_dev); 946a5afba16SPali Rohár } 947a5afba16SPali Rohár 948a5afba16SPali Rohár struct i8k_config_data { 949a5afba16SPali Rohár uint fan_mult; 950a5afba16SPali Rohár uint fan_max; 951a5afba16SPali Rohár }; 952a5afba16SPali Rohár 953a5afba16SPali Rohár enum i8k_configs { 954a5afba16SPali Rohár DELL_LATITUDE_D520, 955a5afba16SPali Rohár DELL_PRECISION_490, 956a5afba16SPali Rohár DELL_STUDIO, 957a5afba16SPali Rohár DELL_XPS, 958a5afba16SPali Rohár }; 959a5afba16SPali Rohár 960c510f6acSArmin Wolf static const struct i8k_config_data i8k_config_data[] __initconst = { 961a5afba16SPali Rohár [DELL_LATITUDE_D520] = { 962a5afba16SPali Rohár .fan_mult = 1, 963a5afba16SPali Rohár .fan_max = I8K_FAN_TURBO, 964a5afba16SPali Rohár }, 965a5afba16SPali Rohár [DELL_PRECISION_490] = { 966a5afba16SPali Rohár .fan_mult = 1, 967a5afba16SPali Rohár .fan_max = I8K_FAN_TURBO, 968a5afba16SPali Rohár }, 969a5afba16SPali Rohár [DELL_STUDIO] = { 970a5afba16SPali Rohár .fan_mult = 1, 971a5afba16SPali Rohár .fan_max = I8K_FAN_HIGH, 972a5afba16SPali Rohár }, 973a5afba16SPali Rohár [DELL_XPS] = { 974a5afba16SPali Rohár .fan_mult = 1, 975a5afba16SPali Rohár .fan_max = I8K_FAN_HIGH, 976a5afba16SPali Rohár }, 977a5afba16SPali Rohár }; 978a5afba16SPali Rohár 9796faadbbbSChristoph Hellwig static const struct dmi_system_id i8k_dmi_table[] __initconst = { 980a5afba16SPali Rohár { 981a5afba16SPali Rohár .ident = "Dell Inspiron", 982a5afba16SPali Rohár .matches = { 983a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"), 984a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"), 985a5afba16SPali Rohár }, 986a5afba16SPali Rohár }, 987a5afba16SPali Rohár { 988a5afba16SPali Rohár .ident = "Dell Latitude", 989a5afba16SPali Rohár .matches = { 990a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"), 991a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"), 992a5afba16SPali Rohár }, 993a5afba16SPali Rohár }, 994a5afba16SPali Rohár { 995a5afba16SPali Rohár .ident = "Dell Inspiron 2", 996a5afba16SPali Rohár .matches = { 997a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 998a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"), 999a5afba16SPali Rohár }, 1000a5afba16SPali Rohár }, 1001a5afba16SPali Rohár { 1002a5afba16SPali Rohár .ident = "Dell Latitude D520", 1003a5afba16SPali Rohár .matches = { 1004a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1005a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"), 1006a5afba16SPali Rohár }, 1007a5afba16SPali Rohár .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520], 1008a5afba16SPali Rohár }, 1009a5afba16SPali Rohár { 1010a5afba16SPali Rohár .ident = "Dell Latitude 2", 1011a5afba16SPali Rohár .matches = { 1012a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1013a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"), 1014a5afba16SPali Rohár }, 1015a5afba16SPali Rohár }, 1016a5afba16SPali Rohár { /* UK Inspiron 6400 */ 1017a5afba16SPali Rohár .ident = "Dell Inspiron 3", 1018a5afba16SPali Rohár .matches = { 1019a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1020a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, "MM061"), 1021a5afba16SPali Rohár }, 1022a5afba16SPali Rohár }, 1023a5afba16SPali Rohár { 1024a5afba16SPali Rohár .ident = "Dell Inspiron 3", 1025a5afba16SPali Rohár .matches = { 1026a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1027a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, "MP061"), 1028a5afba16SPali Rohár }, 1029a5afba16SPali Rohár }, 1030a5afba16SPali Rohár { 1031a5afba16SPali Rohár .ident = "Dell Precision 490", 1032a5afba16SPali Rohár .matches = { 1033a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1034a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, 1035a5afba16SPali Rohár "Precision WorkStation 490"), 1036a5afba16SPali Rohár }, 1037a5afba16SPali Rohár .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490], 1038a5afba16SPali Rohár }, 1039a5afba16SPali Rohár { 1040a5afba16SPali Rohár .ident = "Dell Precision", 1041a5afba16SPali Rohár .matches = { 1042a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1043a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, "Precision"), 1044a5afba16SPali Rohár }, 1045a5afba16SPali Rohár }, 1046a5afba16SPali Rohár { 1047a5afba16SPali Rohár .ident = "Dell Vostro", 1048a5afba16SPali Rohár .matches = { 1049a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1050a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"), 1051a5afba16SPali Rohár }, 1052a5afba16SPali Rohár }, 1053a5afba16SPali Rohár { 1054a5afba16SPali Rohár .ident = "Dell Studio", 1055a5afba16SPali Rohár .matches = { 1056a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1057a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, "Studio"), 1058a5afba16SPali Rohár }, 1059a5afba16SPali Rohár .driver_data = (void *)&i8k_config_data[DELL_STUDIO], 1060a5afba16SPali Rohár }, 1061a5afba16SPali Rohár { 1062a5afba16SPali Rohár .ident = "Dell XPS M140", 1063a5afba16SPali Rohár .matches = { 1064a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1065a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"), 1066a5afba16SPali Rohár }, 1067a5afba16SPali Rohár .driver_data = (void *)&i8k_config_data[DELL_XPS], 1068a5afba16SPali Rohár }, 1069a4811b6cSPali Rohár { 1070b8a13e5eSThomas Hebb .ident = "Dell XPS", 1071a4811b6cSPali Rohár .matches = { 1072a4811b6cSPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1073b8a13e5eSThomas Hebb DMI_MATCH(DMI_PRODUCT_NAME, "XPS"), 1074162372b0SMichele Sorcinelli }, 1075162372b0SMichele Sorcinelli }, 1076a5afba16SPali Rohár { } 1077a5afba16SPali Rohár }; 1078a5afba16SPali Rohár 1079a5afba16SPali Rohár MODULE_DEVICE_TABLE(dmi, i8k_dmi_table); 1080a5afba16SPali Rohár 1081a4b45b25SPali Rohár /* 10822744d2fdSPali Rohár * On some machines once I8K_SMM_GET_FAN_TYPE is issued then CPU fan speed 10832744d2fdSPali Rohár * randomly going up and down due to bug in Dell SMM or BIOS. Here is blacklist 10842744d2fdSPali Rohár * of affected Dell machines for which we disallow I8K_SMM_GET_FAN_TYPE call. 10852744d2fdSPali Rohár * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=100121 10866220f4ebSThorsten Leemhuis */ 10876faadbbbSChristoph Hellwig static const struct dmi_system_id i8k_blacklist_fan_type_dmi_table[] __initconst = { 10882744d2fdSPali Rohár { 10896220f4ebSThorsten Leemhuis .ident = "Dell Studio XPS 8000", 10906220f4ebSThorsten Leemhuis .matches = { 10916220f4ebSThorsten Leemhuis DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 10926220f4ebSThorsten Leemhuis DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8000"), 10936220f4ebSThorsten Leemhuis }, 10946220f4ebSThorsten Leemhuis }, 10956220f4ebSThorsten Leemhuis { 1096a4b45b25SPali Rohár .ident = "Dell Studio XPS 8100", 1097a4b45b25SPali Rohár .matches = { 1098a4b45b25SPali Rohár DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1099a4b45b25SPali Rohár DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8100"), 1100a4b45b25SPali Rohár }, 1101a4b45b25SPali Rohár }, 11022744d2fdSPali Rohár { 11032744d2fdSPali Rohár .ident = "Dell Inspiron 580", 11042744d2fdSPali Rohár .matches = { 11052744d2fdSPali Rohár DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 11062744d2fdSPali Rohár DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 580 "), 11072744d2fdSPali Rohár }, 11082744d2fdSPali Rohár }, 1109a4b45b25SPali Rohár { } 1110a4b45b25SPali Rohár }; 1111a4b45b25SPali Rohár 1112a5afba16SPali Rohár /* 1113f480ea90SPali Rohár * On some machines all fan related SMM functions implemented by Dell BIOS 1114f480ea90SPali Rohár * firmware freeze kernel for about 500ms. Until Dell fixes these problems fan 1115f480ea90SPali Rohár * support for affected blacklisted Dell machines stay disabled. 1116f480ea90SPali Rohár * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=195751 1117f480ea90SPali Rohár */ 1118c510f6acSArmin Wolf static const struct dmi_system_id i8k_blacklist_fan_support_dmi_table[] __initconst = { 1119f480ea90SPali Rohár { 1120f480ea90SPali Rohár .ident = "Dell Inspiron 7720", 1121f480ea90SPali Rohár .matches = { 1122f480ea90SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1123f480ea90SPali Rohár DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"), 1124f480ea90SPali Rohár }, 1125f480ea90SPali Rohár }, 11266fbc4232SOleksandr Natalenko { 11276fbc4232SOleksandr Natalenko .ident = "Dell Vostro 3360", 11286fbc4232SOleksandr Natalenko .matches = { 11296fbc4232SOleksandr Natalenko DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 11306fbc4232SOleksandr Natalenko DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"), 11316fbc4232SOleksandr Natalenko }, 11326fbc4232SOleksandr Natalenko }, 1133536e0019SHelge Eichelberg { 1134536e0019SHelge Eichelberg .ident = "Dell XPS13 9333", 1135536e0019SHelge Eichelberg .matches = { 1136536e0019SHelge Eichelberg DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1137536e0019SHelge Eichelberg DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"), 1138536e0019SHelge Eichelberg }, 1139536e0019SHelge Eichelberg }, 11404008bc7dSThomas Hebb { 11414008bc7dSThomas Hebb .ident = "Dell XPS 15 L502X", 11424008bc7dSThomas Hebb .matches = { 11434008bc7dSThomas Hebb DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 11444008bc7dSThomas Hebb DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L502X"), 11454008bc7dSThomas Hebb }, 11464008bc7dSThomas Hebb }, 1147f480ea90SPali Rohár { } 1148f480ea90SPali Rohár }; 1149f480ea90SPali Rohár 1150afe45277SGiovanni Mascellani struct i8k_fan_control_data { 1151afe45277SGiovanni Mascellani unsigned int manual_fan; 1152afe45277SGiovanni Mascellani unsigned int auto_fan; 1153afe45277SGiovanni Mascellani }; 1154afe45277SGiovanni Mascellani 1155afe45277SGiovanni Mascellani enum i8k_fan_controls { 1156afe45277SGiovanni Mascellani I8K_FAN_34A3_35A3, 1157afe45277SGiovanni Mascellani }; 1158afe45277SGiovanni Mascellani 1159c510f6acSArmin Wolf static const struct i8k_fan_control_data i8k_fan_control_data[] __initconst = { 1160afe45277SGiovanni Mascellani [I8K_FAN_34A3_35A3] = { 1161afe45277SGiovanni Mascellani .manual_fan = 0x34a3, 1162afe45277SGiovanni Mascellani .auto_fan = 0x35a3, 1163afe45277SGiovanni Mascellani }, 1164afe45277SGiovanni Mascellani }; 1165afe45277SGiovanni Mascellani 1166c510f6acSArmin Wolf static const struct dmi_system_id i8k_whitelist_fan_control[] __initconst = { 1167afe45277SGiovanni Mascellani { 11680ca8bb2cSJeffrey Lin .ident = "Dell Latitude 5480", 11690ca8bb2cSJeffrey Lin .matches = { 11700ca8bb2cSJeffrey Lin DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 11710ca8bb2cSJeffrey Lin DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude 5480"), 11720ca8bb2cSJeffrey Lin }, 11730ca8bb2cSJeffrey Lin .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3], 11740ca8bb2cSJeffrey Lin }, 11750ca8bb2cSJeffrey Lin { 1176afe45277SGiovanni Mascellani .ident = "Dell Latitude E6440", 1177afe45277SGiovanni Mascellani .matches = { 1178afe45277SGiovanni Mascellani DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1179afe45277SGiovanni Mascellani DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude E6440"), 1180afe45277SGiovanni Mascellani }, 1181afe45277SGiovanni Mascellani .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3], 1182afe45277SGiovanni Mascellani }, 1183807b8c29SSebastian Oechsle { 1184807b8c29SSebastian Oechsle .ident = "Dell Latitude E7440", 1185807b8c29SSebastian Oechsle .matches = { 1186807b8c29SSebastian Oechsle DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1187807b8c29SSebastian Oechsle DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude E7440"), 1188807b8c29SSebastian Oechsle }, 1189807b8c29SSebastian Oechsle .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3], 1190807b8c29SSebastian Oechsle }, 119195d88d05SCarlos Alberto Lopez Perez { 119295d88d05SCarlos Alberto Lopez Perez .ident = "Dell Precision 5530", 119395d88d05SCarlos Alberto Lopez Perez .matches = { 119495d88d05SCarlos Alberto Lopez Perez DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 119595d88d05SCarlos Alberto Lopez Perez DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Precision 5530"), 119695d88d05SCarlos Alberto Lopez Perez }, 119795d88d05SCarlos Alberto Lopez Perez .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3], 119895d88d05SCarlos Alberto Lopez Perez }, 119995d88d05SCarlos Alberto Lopez Perez { 120095d88d05SCarlos Alberto Lopez Perez .ident = "Dell Precision 7510", 120195d88d05SCarlos Alberto Lopez Perez .matches = { 120295d88d05SCarlos Alberto Lopez Perez DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 120395d88d05SCarlos Alberto Lopez Perez DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Precision 7510"), 120495d88d05SCarlos Alberto Lopez Perez }, 120595d88d05SCarlos Alberto Lopez Perez .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3], 120695d88d05SCarlos Alberto Lopez Perez }, 1207afe45277SGiovanni Mascellani { } 1208afe45277SGiovanni Mascellani }; 1209afe45277SGiovanni Mascellani 12101492fa21SArmin Wolf static int __init dell_smm_probe(struct platform_device *pdev) 1211a5afba16SPali Rohár { 1212ba04d73cSArmin Wolf struct dell_smm_data *data; 1213afe45277SGiovanni Mascellani const struct dmi_system_id *id, *fan_control; 1214a5afba16SPali Rohár int fan, ret; 1215a5afba16SPali Rohár 1216ba04d73cSArmin Wolf data = devm_kzalloc(&pdev->dev, sizeof(struct dell_smm_data), GFP_KERNEL); 1217ba04d73cSArmin Wolf if (!data) 1218ba04d73cSArmin Wolf return -ENOMEM; 1219ba04d73cSArmin Wolf 1220ba04d73cSArmin Wolf mutex_init(&data->i8k_mutex); 1221ba04d73cSArmin Wolf data->i8k_fan_mult = I8K_FAN_MULT; 1222ba04d73cSArmin Wolf data->i8k_fan_max = I8K_FAN_HIGH; 1223ba04d73cSArmin Wolf platform_set_drvdata(pdev, data); 1224ba04d73cSArmin Wolf 1225f480ea90SPali Rohár if (dmi_check_system(i8k_blacklist_fan_support_dmi_table)) { 1226ba04d73cSArmin Wolf dev_warn(&pdev->dev, "broken Dell BIOS detected, disallow fan support\n"); 1227f480ea90SPali Rohár if (!force) 1228ba04d73cSArmin Wolf data->disallow_fan_support = true; 1229f480ea90SPali Rohár } 1230f480ea90SPali Rohár 1231836ad112SPali Rohár if (dmi_check_system(i8k_blacklist_fan_type_dmi_table)) { 1232ba04d73cSArmin Wolf dev_warn(&pdev->dev, "broken Dell BIOS detected, disallow fan type call\n"); 1233836ad112SPali Rohár if (!force) 1234ba04d73cSArmin Wolf data->disallow_fan_type_call = true; 1235836ad112SPali Rohár } 12362744d2fdSPali Rohár 1237ba04d73cSArmin Wolf strscpy(data->bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION), 1238ba04d73cSArmin Wolf sizeof(data->bios_version)); 1239ba04d73cSArmin Wolf strscpy(data->bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), 1240ba04d73cSArmin Wolf sizeof(data->bios_machineid)); 1241a5afba16SPali Rohár 1242a5afba16SPali Rohár /* 1243a5afba16SPali Rohár * Set fan multiplier and maximal fan speed from dmi config 1244a5afba16SPali Rohár * Values specified in module parameters override values from dmi 1245a5afba16SPali Rohár */ 1246a5afba16SPali Rohár id = dmi_first_match(i8k_dmi_table); 1247a5afba16SPali Rohár if (id && id->driver_data) { 1248a5afba16SPali Rohár const struct i8k_config_data *conf = id->driver_data; 12491492fa21SArmin Wolf 1250a5afba16SPali Rohár if (!fan_mult && conf->fan_mult) 1251a5afba16SPali Rohár fan_mult = conf->fan_mult; 1252ba04d73cSArmin Wolf 1253a5afba16SPali Rohár if (!fan_max && conf->fan_max) 1254a5afba16SPali Rohár fan_max = conf->fan_max; 1255a5afba16SPali Rohár } 1256a5afba16SPali Rohár 1257ba04d73cSArmin Wolf data->i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */ 1258ba04d73cSArmin Wolf data->i8k_pwm_mult = DIV_ROUND_UP(255, data->i8k_fan_max); 1259a5afba16SPali Rohár 1260afe45277SGiovanni Mascellani fan_control = dmi_first_match(i8k_whitelist_fan_control); 1261afe45277SGiovanni Mascellani if (fan_control && fan_control->driver_data) { 1262ba04d73cSArmin Wolf const struct i8k_fan_control_data *control = fan_control->driver_data; 1263afe45277SGiovanni Mascellani 1264ba04d73cSArmin Wolf data->manual_fan = control->manual_fan; 1265ba04d73cSArmin Wolf data->auto_fan = control->auto_fan; 1266ba04d73cSArmin Wolf dev_info(&pdev->dev, "enabling support for setting automatic/manual fan control\n"); 1267afe45277SGiovanni Mascellani } 1268afe45277SGiovanni Mascellani 1269a5afba16SPali Rohár if (!fan_mult) { 1270a5afba16SPali Rohár /* 1271a5afba16SPali Rohár * Autodetect fan multiplier based on nominal rpm 1272a5afba16SPali Rohár * If fan reports rpm value too high then set multiplier to 1 1273a5afba16SPali Rohár */ 12742757269aSArmin Wolf for (fan = 0; fan < DELL_SMM_NO_FANS; ++fan) { 1275ba04d73cSArmin Wolf ret = i8k_get_fan_nominal_speed(data, fan, data->i8k_fan_max); 1276a5afba16SPali Rohár if (ret < 0) 1277a5afba16SPali Rohár continue; 1278ba04d73cSArmin Wolf 1279a5afba16SPali Rohár if (ret > I8K_FAN_MAX_RPM) 1280ba04d73cSArmin Wolf data->i8k_fan_mult = 1; 1281a5afba16SPali Rohár break; 1282a5afba16SPali Rohár } 1283a5afba16SPali Rohár } else { 1284a5afba16SPali Rohár /* Fan multiplier was specified in module param or in dmi */ 1285ba04d73cSArmin Wolf data->i8k_fan_mult = fan_mult; 1286a5afba16SPali Rohár } 1287a5afba16SPali Rohár 12881492fa21SArmin Wolf ret = dell_smm_init_hwmon(&pdev->dev); 12891492fa21SArmin Wolf if (ret) 12901492fa21SArmin Wolf return ret; 12911492fa21SArmin Wolf 1292a2cb66b4SArmin Wolf i8k_init_procfs(&pdev->dev); 12931492fa21SArmin Wolf 12941492fa21SArmin Wolf return 0; 12951492fa21SArmin Wolf } 12961492fa21SArmin Wolf 12971492fa21SArmin Wolf static struct platform_driver dell_smm_driver = { 12981492fa21SArmin Wolf .driver = { 12991492fa21SArmin Wolf .name = KBUILD_MODNAME, 13001492fa21SArmin Wolf }, 13011492fa21SArmin Wolf }; 13021492fa21SArmin Wolf 13031492fa21SArmin Wolf static struct platform_device *dell_smm_device; 13041492fa21SArmin Wolf 13051492fa21SArmin Wolf /* 13061492fa21SArmin Wolf * Probe for the presence of a supported laptop. 13071492fa21SArmin Wolf */ 1308a5afba16SPali Rohár static int __init i8k_init(void) 1309a5afba16SPali Rohár { 13101492fa21SArmin Wolf /* 13111492fa21SArmin Wolf * Get DMI information 13121492fa21SArmin Wolf */ 13131492fa21SArmin Wolf if (!dmi_check_system(i8k_dmi_table)) { 13141492fa21SArmin Wolf if (!ignore_dmi && !force) 1315a5afba16SPali Rohár return -ENODEV; 1316a5afba16SPali Rohár 13171492fa21SArmin Wolf pr_info("not running on a supported Dell system.\n"); 13181492fa21SArmin Wolf pr_info("vendor=%s, model=%s, version=%s\n", 13191492fa21SArmin Wolf i8k_get_dmi_data(DMI_SYS_VENDOR), 13201492fa21SArmin Wolf i8k_get_dmi_data(DMI_PRODUCT_NAME), 13211492fa21SArmin Wolf i8k_get_dmi_data(DMI_BIOS_VERSION)); 13221492fa21SArmin Wolf } 1323039ae585SPali Rohár 13241492fa21SArmin Wolf /* 13251492fa21SArmin Wolf * Get SMM Dell signature 13261492fa21SArmin Wolf */ 13271492fa21SArmin Wolf if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) && 13281492fa21SArmin Wolf i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) { 13291492fa21SArmin Wolf pr_err("unable to get SMM Dell signature\n"); 13301492fa21SArmin Wolf if (!force) 13311492fa21SArmin Wolf return -ENODEV; 13321492fa21SArmin Wolf } 13331492fa21SArmin Wolf 13341492fa21SArmin Wolf dell_smm_device = platform_create_bundle(&dell_smm_driver, dell_smm_probe, NULL, 0, NULL, 13351492fa21SArmin Wolf 0); 13361492fa21SArmin Wolf 13371492fa21SArmin Wolf return PTR_ERR_OR_ZERO(dell_smm_device); 1338a5afba16SPali Rohár } 1339a5afba16SPali Rohár 1340a5afba16SPali Rohár static void __exit i8k_exit(void) 1341a5afba16SPali Rohár { 13421492fa21SArmin Wolf platform_device_unregister(dell_smm_device); 13431492fa21SArmin Wolf platform_driver_unregister(&dell_smm_driver); 1344a5afba16SPali Rohár } 1345a5afba16SPali Rohár 1346a5afba16SPali Rohár module_init(i8k_init); 1347a5afba16SPali Rohár module_exit(i8k_exit); 1348