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 156105870fSArmin Wolf #include <linux/capability.h> 1627046a3fSJuergen Gross #include <linux/cpu.h> 176105870fSArmin Wolf #include <linux/ctype.h> 18a5afba16SPali Rohár #include <linux/delay.h> 196105870fSArmin Wolf #include <linux/dmi.h> 201492fa21SArmin Wolf #include <linux/err.h> 21*e64325e8SArmin Wolf #include <linux/errno.h> 226105870fSArmin Wolf #include <linux/hwmon.h> 23a5afba16SPali Rohár #include <linux/init.h> 246105870fSArmin Wolf #include <linux/module.h> 256105870fSArmin Wolf #include <linux/mutex.h> 266105870fSArmin Wolf #include <linux/platform_device.h> 27a5afba16SPali Rohár #include <linux/proc_fs.h> 28a5afba16SPali Rohár #include <linux/seq_file.h> 2938c5b0ddSArmin Wolf #include <linux/string.h> 3027046a3fSJuergen Gross #include <linux/smp.h> 316105870fSArmin Wolf #include <linux/types.h> 326105870fSArmin Wolf #include <linux/uaccess.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]; 79b1986c8eSArmin Wolf int *fan_nominal_speed[DELL_SMM_NO_FANS]; 80ba04d73cSArmin Wolf }; 81a5afba16SPali Rohár 82a5afba16SPali Rohár MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)"); 83149ed3d4SPali Rohár MODULE_AUTHOR("Pali Rohár <pali@kernel.org>"); 84039ae585SPali Rohár MODULE_DESCRIPTION("Dell laptop SMM BIOS hwmon driver"); 85a5afba16SPali Rohár MODULE_LICENSE("GPL"); 86a5afba16SPali Rohár MODULE_ALIAS("i8k"); 87a5afba16SPali Rohár 88a5afba16SPali Rohár static bool force; 89a5afba16SPali Rohár module_param(force, bool, 0); 90a5afba16SPali Rohár MODULE_PARM_DESC(force, "Force loading without checking for supported models"); 91a5afba16SPali Rohár 92a5afba16SPali Rohár static bool ignore_dmi; 93a5afba16SPali Rohár module_param(ignore_dmi, bool, 0); 94a5afba16SPali Rohár MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match"); 95a5afba16SPali Rohár 96039ae585SPali Rohár #if IS_ENABLED(CONFIG_I8K) 977613663cSPali Rohár static bool restricted = true; 98a5afba16SPali Rohár module_param(restricted, bool, 0); 997613663cSPali Rohár MODULE_PARM_DESC(restricted, "Restrict fan control and serial number to CAP_SYS_ADMIN (default: 1)"); 100a5afba16SPali Rohár 101a5afba16SPali Rohár static bool power_status; 102a5afba16SPali Rohár module_param(power_status, bool, 0600); 1037613663cSPali Rohár MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k (default: 0)"); 104039ae585SPali Rohár #endif 105a5afba16SPali Rohár 106a5afba16SPali Rohár static uint fan_mult; 107a5afba16SPali Rohár module_param(fan_mult, uint, 0); 108a5afba16SPali Rohár MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)"); 109a5afba16SPali Rohár 110a5afba16SPali Rohár static uint fan_max; 111a5afba16SPali Rohár module_param(fan_max, uint, 0); 112a5afba16SPali Rohár MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)"); 113a5afba16SPali Rohár 114a5afba16SPali Rohár struct smm_regs { 115a5afba16SPali Rohár unsigned int eax; 116a5afba16SPali Rohár unsigned int ebx __packed; 117a5afba16SPali Rohár unsigned int ecx __packed; 118a5afba16SPali Rohár unsigned int edx __packed; 119a5afba16SPali Rohár unsigned int esi __packed; 120a5afba16SPali Rohár unsigned int edi __packed; 121a5afba16SPali Rohár }; 122a5afba16SPali Rohár 123deeba244SArmin Wolf static const char * const temp_labels[] = { 124deeba244SArmin Wolf "CPU", 125deeba244SArmin Wolf "GPU", 126deeba244SArmin Wolf "SODIMM", 127deeba244SArmin Wolf "Other", 128deeba244SArmin Wolf "Ambient", 129deeba244SArmin Wolf "Other", 130deeba244SArmin Wolf }; 131deeba244SArmin Wolf 132deeba244SArmin Wolf static const char * const fan_labels[] = { 133deeba244SArmin Wolf "Processor Fan", 134deeba244SArmin Wolf "Motherboard Fan", 135deeba244SArmin Wolf "Video Fan", 136deeba244SArmin Wolf "Power Supply Fan", 137deeba244SArmin Wolf "Chipset Fan", 138deeba244SArmin Wolf "Other Fan", 139deeba244SArmin Wolf }; 140deeba244SArmin Wolf 141deeba244SArmin Wolf static const char * const docking_labels[] = { 142deeba244SArmin Wolf "Docking Processor Fan", 143deeba244SArmin Wolf "Docking Motherboard Fan", 144deeba244SArmin Wolf "Docking Video Fan", 145deeba244SArmin Wolf "Docking Power Supply Fan", 146deeba244SArmin Wolf "Docking Chipset Fan", 147deeba244SArmin Wolf "Docking Other Fan", 148deeba244SArmin Wolf }; 149deeba244SArmin Wolf 150c9363cdfSArmin Wolf static inline const char __init *i8k_get_dmi_data(int field) 151a5afba16SPali Rohár { 152a5afba16SPali Rohár const char *dmi_data = dmi_get_system_info(field); 153a5afba16SPali Rohár 154a5afba16SPali Rohár return dmi_data && *dmi_data ? dmi_data : "?"; 155a5afba16SPali Rohár } 156a5afba16SPali Rohár 157a5afba16SPali Rohár /* 158a5afba16SPali Rohár * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard. 159a5afba16SPali Rohár */ 16027046a3fSJuergen Gross static int i8k_smm_func(void *par) 161a5afba16SPali Rohár { 1628713b4a4SArmin Wolf ktime_t calltime = ktime_get(); 16327046a3fSJuergen Gross struct smm_regs *regs = par; 164a5afba16SPali Rohár int eax = regs->eax; 1659d58bec0SPali Rohár int ebx = regs->ebx; 1668713b4a4SArmin Wolf long long duration; 1678713b4a4SArmin Wolf int rc; 1689d58bec0SPali Rohár 169a5afba16SPali Rohár /* SMM requires CPU 0 */ 17027046a3fSJuergen Gross if (smp_processor_id() != 0) 17127046a3fSJuergen Gross return -EBUSY; 172a5afba16SPali Rohár 173a5afba16SPali Rohár #if defined(CONFIG_X86_64) 174a5afba16SPali Rohár asm volatile("pushq %%rax\n\t" 175a5afba16SPali Rohár "movl 0(%%rax),%%edx\n\t" 176a5afba16SPali Rohár "pushq %%rdx\n\t" 177a5afba16SPali Rohár "movl 4(%%rax),%%ebx\n\t" 178a5afba16SPali Rohár "movl 8(%%rax),%%ecx\n\t" 179a5afba16SPali Rohár "movl 12(%%rax),%%edx\n\t" 180a5afba16SPali Rohár "movl 16(%%rax),%%esi\n\t" 181a5afba16SPali Rohár "movl 20(%%rax),%%edi\n\t" 182a5afba16SPali Rohár "popq %%rax\n\t" 183a5afba16SPali Rohár "out %%al,$0xb2\n\t" 184a5afba16SPali Rohár "out %%al,$0x84\n\t" 185a5afba16SPali Rohár "xchgq %%rax,(%%rsp)\n\t" 186a5afba16SPali Rohár "movl %%ebx,4(%%rax)\n\t" 187a5afba16SPali Rohár "movl %%ecx,8(%%rax)\n\t" 188a5afba16SPali Rohár "movl %%edx,12(%%rax)\n\t" 189a5afba16SPali Rohár "movl %%esi,16(%%rax)\n\t" 190a5afba16SPali Rohár "movl %%edi,20(%%rax)\n\t" 191a5afba16SPali Rohár "popq %%rdx\n\t" 192a5afba16SPali Rohár "movl %%edx,0(%%rax)\n\t" 193a5afba16SPali Rohár "pushfq\n\t" 194a5afba16SPali Rohár "popq %%rax\n\t" 195a5afba16SPali Rohár "andl $1,%%eax\n" 196a5afba16SPali Rohár : "=a"(rc) 197a5afba16SPali Rohár : "a"(regs) 198a5afba16SPali Rohár : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory"); 199a5afba16SPali Rohár #else 200a5afba16SPali Rohár asm volatile("pushl %%eax\n\t" 201a5afba16SPali Rohár "movl 0(%%eax),%%edx\n\t" 202a5afba16SPali Rohár "push %%edx\n\t" 203a5afba16SPali Rohár "movl 4(%%eax),%%ebx\n\t" 204a5afba16SPali Rohár "movl 8(%%eax),%%ecx\n\t" 205a5afba16SPali Rohár "movl 12(%%eax),%%edx\n\t" 206a5afba16SPali Rohár "movl 16(%%eax),%%esi\n\t" 207a5afba16SPali Rohár "movl 20(%%eax),%%edi\n\t" 208a5afba16SPali Rohár "popl %%eax\n\t" 209a5afba16SPali Rohár "out %%al,$0xb2\n\t" 210a5afba16SPali Rohár "out %%al,$0x84\n\t" 211a5afba16SPali Rohár "xchgl %%eax,(%%esp)\n\t" 212a5afba16SPali Rohár "movl %%ebx,4(%%eax)\n\t" 213a5afba16SPali Rohár "movl %%ecx,8(%%eax)\n\t" 214a5afba16SPali Rohár "movl %%edx,12(%%eax)\n\t" 215a5afba16SPali Rohár "movl %%esi,16(%%eax)\n\t" 216a5afba16SPali Rohár "movl %%edi,20(%%eax)\n\t" 217a5afba16SPali Rohár "popl %%edx\n\t" 218a5afba16SPali Rohár "movl %%edx,0(%%eax)\n\t" 219a5afba16SPali Rohár "lahf\n\t" 220a5afba16SPali Rohár "shrl $8,%%eax\n\t" 221a5afba16SPali Rohár "andl $1,%%eax\n" 222a5afba16SPali Rohár : "=a"(rc) 223a5afba16SPali Rohár : "a"(regs) 224a5afba16SPali Rohár : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory"); 225a5afba16SPali Rohár #endif 226a5afba16SPali Rohár if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax) 227a5afba16SPali Rohár rc = -EINVAL; 228a5afba16SPali Rohár 2298713b4a4SArmin Wolf duration = ktime_us_delta(ktime_get(), calltime); 2308713b4a4SArmin Wolf pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x (took %7lld usecs)\n", eax, ebx, 2319d58bec0SPali Rohár (rc ? 0xffff : regs->eax & 0xffff), duration); 2329d58bec0SPali Rohár 233a5afba16SPali Rohár return rc; 234a5afba16SPali Rohár } 235a5afba16SPali Rohár 236a5afba16SPali Rohár /* 23727046a3fSJuergen Gross * Call the System Management Mode BIOS. 23827046a3fSJuergen Gross */ 23927046a3fSJuergen Gross static int i8k_smm(struct smm_regs *regs) 24027046a3fSJuergen Gross { 24127046a3fSJuergen Gross int ret; 24227046a3fSJuergen Gross 243e104d530SSebastian Andrzej Siewior cpus_read_lock(); 24427046a3fSJuergen Gross ret = smp_call_on_cpu(0, i8k_smm_func, regs, true); 245e104d530SSebastian Andrzej Siewior cpus_read_unlock(); 24627046a3fSJuergen Gross 24727046a3fSJuergen Gross return ret; 24827046a3fSJuergen Gross } 24927046a3fSJuergen Gross 25027046a3fSJuergen Gross /* 251a5afba16SPali Rohár * Read the fan status. 252a5afba16SPali Rohár */ 253ba04d73cSArmin Wolf static int i8k_get_fan_status(const struct dell_smm_data *data, int fan) 254a5afba16SPali Rohár { 255a5afba16SPali Rohár struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, }; 256a5afba16SPali Rohár 257ba04d73cSArmin Wolf if (data->disallow_fan_support) 258f480ea90SPali Rohár return -EINVAL; 259f480ea90SPali Rohár 260a5afba16SPali Rohár regs.ebx = fan & 0xff; 261a5afba16SPali Rohár return i8k_smm(®s) ? : regs.eax & 0xff; 262a5afba16SPali Rohár } 263a5afba16SPali Rohár 264a5afba16SPali Rohár /* 265a5afba16SPali Rohár * Read the fan speed in RPM. 266a5afba16SPali Rohár */ 267ba04d73cSArmin Wolf static int i8k_get_fan_speed(const struct dell_smm_data *data, int fan) 268a5afba16SPali Rohár { 269a5afba16SPali Rohár struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, }; 270a5afba16SPali Rohár 271ba04d73cSArmin Wolf if (data->disallow_fan_support) 272f480ea90SPali Rohár return -EINVAL; 273f480ea90SPali Rohár 274a5afba16SPali Rohár regs.ebx = fan & 0xff; 275ba04d73cSArmin Wolf return i8k_smm(®s) ? : (regs.eax & 0xffff) * data->i8k_fan_mult; 276a5afba16SPali Rohár } 277a5afba16SPali Rohár 278a5afba16SPali Rohár /* 279a5afba16SPali Rohár * Read the fan type. 280a5afba16SPali Rohár */ 281ba04d73cSArmin Wolf static int _i8k_get_fan_type(const struct dell_smm_data *data, int fan) 282a5afba16SPali Rohár { 283a5afba16SPali Rohár struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, }; 284a5afba16SPali Rohár 285ba04d73cSArmin Wolf if (data->disallow_fan_support || data->disallow_fan_type_call) 2862744d2fdSPali Rohár return -EINVAL; 2872744d2fdSPali Rohár 288a5afba16SPali Rohár regs.ebx = fan & 0xff; 289a5afba16SPali Rohár return i8k_smm(®s) ? : regs.eax & 0xff; 290a5afba16SPali Rohár } 291a5afba16SPali Rohár 292ba04d73cSArmin Wolf static int i8k_get_fan_type(struct dell_smm_data *data, int fan) 2935ce91714SPali Rohár { 2945ce91714SPali Rohár /* I8K_SMM_GET_FAN_TYPE SMM call is expensive, so cache values */ 295deeba244SArmin Wolf if (data->fan_type[fan] == INT_MIN) 296deeba244SArmin Wolf data->fan_type[fan] = _i8k_get_fan_type(data, fan); 2975ce91714SPali Rohár 298deeba244SArmin Wolf return data->fan_type[fan]; 2995ce91714SPali Rohár } 3005ce91714SPali Rohár 301a5afba16SPali Rohár /* 302a5afba16SPali Rohár * Read the fan nominal rpm for specific fan speed. 303a5afba16SPali Rohár */ 304782a99c1SArmin Wolf static int __init i8k_get_fan_nominal_speed(const struct dell_smm_data *data, int fan, int speed) 305a5afba16SPali Rohár { 306a5afba16SPali Rohár struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, }; 307a5afba16SPali Rohár 308ba04d73cSArmin Wolf if (data->disallow_fan_support) 309f480ea90SPali Rohár return -EINVAL; 310f480ea90SPali Rohár 311a5afba16SPali Rohár regs.ebx = (fan & 0xff) | (speed << 8); 312ba04d73cSArmin Wolf return i8k_smm(®s) ? : (regs.eax & 0xffff) * data->i8k_fan_mult; 313a5afba16SPali Rohár } 314a5afba16SPali Rohár 315a5afba16SPali Rohár /* 316afe45277SGiovanni Mascellani * Enable or disable automatic BIOS fan control support 317afe45277SGiovanni Mascellani */ 318ba04d73cSArmin Wolf static int i8k_enable_fan_auto_mode(const struct dell_smm_data *data, bool enable) 319afe45277SGiovanni Mascellani { 320afe45277SGiovanni Mascellani struct smm_regs regs = { }; 321afe45277SGiovanni Mascellani 322ba04d73cSArmin Wolf if (data->disallow_fan_support) 323afe45277SGiovanni Mascellani return -EINVAL; 324afe45277SGiovanni Mascellani 325ba04d73cSArmin Wolf regs.eax = enable ? data->auto_fan : data->manual_fan; 326afe45277SGiovanni Mascellani return i8k_smm(®s); 327afe45277SGiovanni Mascellani } 328afe45277SGiovanni Mascellani 329afe45277SGiovanni Mascellani /* 330a5afba16SPali Rohár * Set the fan speed (off, low, high). Returns the new fan status. 331a5afba16SPali Rohár */ 332ba04d73cSArmin Wolf static int i8k_set_fan(const struct dell_smm_data *data, int fan, int speed) 333a5afba16SPali Rohár { 334a5afba16SPali Rohár struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, }; 335a5afba16SPali Rohár 336ba04d73cSArmin Wolf if (data->disallow_fan_support) 337f480ea90SPali Rohár return -EINVAL; 338f480ea90SPali Rohár 339ba04d73cSArmin Wolf speed = (speed < 0) ? 0 : ((speed > data->i8k_fan_max) ? data->i8k_fan_max : speed); 340a5afba16SPali Rohár regs.ebx = (fan & 0xff) | (speed << 8); 341a5afba16SPali Rohár 342ba04d73cSArmin Wolf return i8k_smm(®s) ? : i8k_get_fan_status(data, fan); 343a5afba16SPali Rohár } 344a5afba16SPali Rohár 345deeba244SArmin Wolf static int __init i8k_get_temp_type(int sensor) 346a5afba16SPali Rohár { 347a5afba16SPali Rohár struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, }; 348a5afba16SPali Rohár 349a5afba16SPali Rohár regs.ebx = sensor & 0xff; 350a5afba16SPali Rohár return i8k_smm(®s) ? : regs.eax & 0xff; 351a5afba16SPali Rohár } 352a5afba16SPali Rohár 353a5afba16SPali Rohár /* 354a5afba16SPali Rohár * Read the cpu temperature. 355a5afba16SPali Rohár */ 356a5afba16SPali Rohár static int _i8k_get_temp(int sensor) 357a5afba16SPali Rohár { 358a5afba16SPali Rohár struct smm_regs regs = { 359a5afba16SPali Rohár .eax = I8K_SMM_GET_TEMP, 360a5afba16SPali Rohár .ebx = sensor & 0xff, 361a5afba16SPali Rohár }; 362a5afba16SPali Rohár 363a5afba16SPali Rohár return i8k_smm(®s) ? : regs.eax & 0xff; 364a5afba16SPali Rohár } 365a5afba16SPali Rohár 366a5afba16SPali Rohár static int i8k_get_temp(int sensor) 367a5afba16SPali Rohár { 368a5afba16SPali Rohár int temp = _i8k_get_temp(sensor); 369a5afba16SPali Rohár 370a5afba16SPali Rohár /* 371a5afba16SPali Rohár * Sometimes the temperature sensor returns 0x99, which is out of range. 372a5afba16SPali Rohár * In this case we retry (once) before returning an error. 373a5afba16SPali Rohár # 1003655137 00000058 00005a4b 374a5afba16SPali Rohár # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees 375a5afba16SPali Rohár # 1003655139 00000054 00005c52 376a5afba16SPali Rohár */ 377a5afba16SPali Rohár if (temp == 0x99) { 378a5afba16SPali Rohár msleep(100); 379a5afba16SPali Rohár temp = _i8k_get_temp(sensor); 380a5afba16SPali Rohár } 381a5afba16SPali Rohár /* 382a5afba16SPali Rohár * Return -ENODATA for all invalid temperatures. 383a5afba16SPali Rohár * 384a5afba16SPali Rohár * Known instances are the 0x99 value as seen above as well as 385a5afba16SPali Rohár * 0xc1 (193), which may be returned when trying to read the GPU 386a5afba16SPali Rohár * temperature if the system supports a GPU and it is currently 387a5afba16SPali Rohár * turned off. 388a5afba16SPali Rohár */ 389a5afba16SPali Rohár if (temp > I8K_MAX_TEMP) 390a5afba16SPali Rohár return -ENODATA; 391a5afba16SPali Rohár 392a5afba16SPali Rohár return temp; 393a5afba16SPali Rohár } 394a5afba16SPali Rohár 395c9363cdfSArmin Wolf static int __init i8k_get_dell_signature(int req_fn) 396a5afba16SPali Rohár { 397a5afba16SPali Rohár struct smm_regs regs = { .eax = req_fn, }; 398a5afba16SPali Rohár int rc; 399a5afba16SPali Rohár 400a5afba16SPali Rohár rc = i8k_smm(®s); 401a5afba16SPali Rohár if (rc < 0) 402a5afba16SPali Rohár return rc; 403a5afba16SPali Rohár 404a5afba16SPali Rohár return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1; 405a5afba16SPali Rohár } 406a5afba16SPali Rohár 407039ae585SPali Rohár #if IS_ENABLED(CONFIG_I8K) 408039ae585SPali Rohár 409039ae585SPali Rohár /* 410039ae585SPali Rohár * Read the Fn key status. 411039ae585SPali Rohár */ 412039ae585SPali Rohár static int i8k_get_fn_status(void) 413039ae585SPali Rohár { 414039ae585SPali Rohár struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, }; 415039ae585SPali Rohár int rc; 416039ae585SPali Rohár 417039ae585SPali Rohár rc = i8k_smm(®s); 418039ae585SPali Rohár if (rc < 0) 419039ae585SPali Rohár return rc; 420039ae585SPali Rohár 421039ae585SPali Rohár switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) { 422039ae585SPali Rohár case I8K_FN_UP: 423039ae585SPali Rohár return I8K_VOL_UP; 424039ae585SPali Rohár case I8K_FN_DOWN: 425039ae585SPali Rohár return I8K_VOL_DOWN; 426039ae585SPali Rohár case I8K_FN_MUTE: 427039ae585SPali Rohár return I8K_VOL_MUTE; 428039ae585SPali Rohár default: 429039ae585SPali Rohár return 0; 430039ae585SPali Rohár } 431039ae585SPali Rohár } 432039ae585SPali Rohár 433039ae585SPali Rohár /* 434039ae585SPali Rohár * Read the power status. 435039ae585SPali Rohár */ 436039ae585SPali Rohár static int i8k_get_power_status(void) 437039ae585SPali Rohár { 438039ae585SPali Rohár struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, }; 439039ae585SPali Rohár int rc; 440039ae585SPali Rohár 441039ae585SPali Rohár rc = i8k_smm(®s); 442039ae585SPali Rohár if (rc < 0) 443039ae585SPali Rohár return rc; 444039ae585SPali Rohár 445039ae585SPali Rohár return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY; 446039ae585SPali Rohár } 447039ae585SPali Rohár 448039ae585SPali Rohár /* 449039ae585SPali Rohár * Procfs interface 450039ae585SPali Rohár */ 451039ae585SPali Rohár 452a5afba16SPali Rohár static int 453ba04d73cSArmin Wolf i8k_ioctl_unlocked(struct file *fp, struct dell_smm_data *data, unsigned int cmd, unsigned long arg) 454a5afba16SPali Rohár { 455a5afba16SPali Rohár int val = 0; 456a5afba16SPali Rohár int speed; 457a5afba16SPali Rohár unsigned char buff[16]; 458a5afba16SPali Rohár int __user *argp = (int __user *)arg; 459a5afba16SPali Rohár 460a5afba16SPali Rohár if (!argp) 461a5afba16SPali Rohár return -EINVAL; 462a5afba16SPali Rohár 463a5afba16SPali Rohár switch (cmd) { 464a5afba16SPali Rohár case I8K_BIOS_VERSION: 465ba04d73cSArmin Wolf if (!isdigit(data->bios_version[0]) || !isdigit(data->bios_version[1]) || 466ba04d73cSArmin Wolf !isdigit(data->bios_version[2])) 467053ea640SPali Rohár return -EINVAL; 468053ea640SPali Rohár 469ba04d73cSArmin Wolf val = (data->bios_version[0] << 16) | 470ba04d73cSArmin Wolf (data->bios_version[1] << 8) | data->bios_version[2]; 471a5afba16SPali Rohár break; 472a5afba16SPali Rohár 473a5afba16SPali Rohár case I8K_MACHINE_ID: 4747613663cSPali Rohár if (restricted && !capable(CAP_SYS_ADMIN)) 4757613663cSPali Rohár return -EPERM; 4767613663cSPali Rohár 47738c5b0ddSArmin Wolf strscpy_pad(buff, data->bios_machineid, sizeof(buff)); 478a5afba16SPali Rohár break; 479a5afba16SPali Rohár 480a5afba16SPali Rohár case I8K_FN_STATUS: 481a5afba16SPali Rohár val = i8k_get_fn_status(); 482a5afba16SPali Rohár break; 483a5afba16SPali Rohár 484a5afba16SPali Rohár case I8K_POWER_STATUS: 485a5afba16SPali Rohár val = i8k_get_power_status(); 486a5afba16SPali Rohár break; 487a5afba16SPali Rohár 488a5afba16SPali Rohár case I8K_GET_TEMP: 489a5afba16SPali Rohár val = i8k_get_temp(0); 490a5afba16SPali Rohár break; 491a5afba16SPali Rohár 492a5afba16SPali Rohár case I8K_GET_SPEED: 493a5afba16SPali Rohár if (copy_from_user(&val, argp, sizeof(int))) 494a5afba16SPali Rohár return -EFAULT; 495a5afba16SPali Rohár 496ba04d73cSArmin Wolf val = i8k_get_fan_speed(data, val); 497a5afba16SPali Rohár break; 498a5afba16SPali Rohár 499a5afba16SPali Rohár case I8K_GET_FAN: 500a5afba16SPali Rohár if (copy_from_user(&val, argp, sizeof(int))) 501a5afba16SPali Rohár return -EFAULT; 502a5afba16SPali Rohár 503ba04d73cSArmin Wolf val = i8k_get_fan_status(data, val); 504a5afba16SPali Rohár break; 505a5afba16SPali Rohár 506a5afba16SPali Rohár case I8K_SET_FAN: 507a5afba16SPali Rohár if (restricted && !capable(CAP_SYS_ADMIN)) 508a5afba16SPali Rohár return -EPERM; 509a5afba16SPali Rohár 510a5afba16SPali Rohár if (copy_from_user(&val, argp, sizeof(int))) 511a5afba16SPali Rohár return -EFAULT; 512a5afba16SPali Rohár 513a5afba16SPali Rohár if (copy_from_user(&speed, argp + 1, sizeof(int))) 514a5afba16SPali Rohár return -EFAULT; 515a5afba16SPali Rohár 516ba04d73cSArmin Wolf val = i8k_set_fan(data, val, speed); 517a5afba16SPali Rohár break; 518a5afba16SPali Rohár 519a5afba16SPali Rohár default: 520*e64325e8SArmin Wolf return -ENOIOCTLCMD; 521a5afba16SPali Rohár } 522a5afba16SPali Rohár 523a5afba16SPali Rohár if (val < 0) 524a5afba16SPali Rohár return val; 525a5afba16SPali Rohár 526a5afba16SPali Rohár switch (cmd) { 527a5afba16SPali Rohár case I8K_BIOS_VERSION: 528a5afba16SPali Rohár if (copy_to_user(argp, &val, 4)) 529a5afba16SPali Rohár return -EFAULT; 530a5afba16SPali Rohár 531a5afba16SPali Rohár break; 532a5afba16SPali Rohár case I8K_MACHINE_ID: 533a5afba16SPali Rohár if (copy_to_user(argp, buff, 16)) 534a5afba16SPali Rohár return -EFAULT; 535a5afba16SPali Rohár 536a5afba16SPali Rohár break; 537a5afba16SPali Rohár default: 538a5afba16SPali Rohár if (copy_to_user(argp, &val, sizeof(int))) 539a5afba16SPali Rohár return -EFAULT; 540a5afba16SPali Rohár 541a5afba16SPali Rohár break; 542a5afba16SPali Rohár } 543a5afba16SPali Rohár 544a5afba16SPali Rohár return 0; 545a5afba16SPali Rohár } 546a5afba16SPali Rohár 547a5afba16SPali Rohár static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) 548a5afba16SPali Rohár { 549ba04d73cSArmin Wolf struct dell_smm_data *data = PDE_DATA(file_inode(fp)); 550a5afba16SPali Rohár long ret; 551a5afba16SPali Rohár 552ba04d73cSArmin Wolf mutex_lock(&data->i8k_mutex); 553ba04d73cSArmin Wolf ret = i8k_ioctl_unlocked(fp, data, cmd, arg); 554ba04d73cSArmin Wolf mutex_unlock(&data->i8k_mutex); 555a5afba16SPali Rohár 556a5afba16SPali Rohár return ret; 557a5afba16SPali Rohár } 558a5afba16SPali Rohár 559a5afba16SPali Rohár /* 560a5afba16SPali Rohár * Print the information for /proc/i8k. 561a5afba16SPali Rohár */ 562a5afba16SPali Rohár static int i8k_proc_show(struct seq_file *seq, void *offset) 563a5afba16SPali Rohár { 564ba04d73cSArmin Wolf struct dell_smm_data *data = seq->private; 565a5afba16SPali Rohár int fn_key, cpu_temp, ac_power; 566a5afba16SPali Rohár int left_fan, right_fan, left_speed, right_speed; 567a5afba16SPali Rohár 568a5afba16SPali Rohár cpu_temp = i8k_get_temp(0); /* 11100 µs */ 569ba04d73cSArmin Wolf left_fan = i8k_get_fan_status(data, I8K_FAN_LEFT); /* 580 µs */ 570ba04d73cSArmin Wolf right_fan = i8k_get_fan_status(data, I8K_FAN_RIGHT); /* 580 µs */ 571ba04d73cSArmin Wolf left_speed = i8k_get_fan_speed(data, I8K_FAN_LEFT); /* 580 µs */ 572ba04d73cSArmin Wolf right_speed = i8k_get_fan_speed(data, I8K_FAN_RIGHT); /* 580 µs */ 573a5afba16SPali Rohár fn_key = i8k_get_fn_status(); /* 750 µs */ 574a5afba16SPali Rohár if (power_status) 575a5afba16SPali Rohár ac_power = i8k_get_power_status(); /* 14700 µs */ 576a5afba16SPali Rohár else 577a5afba16SPali Rohár ac_power = -1; 578a5afba16SPali Rohár 579a5afba16SPali Rohár /* 580a5afba16SPali Rohár * Info: 581a5afba16SPali Rohár * 582a5afba16SPali Rohár * 1) Format version (this will change if format changes) 583a5afba16SPali Rohár * 2) BIOS version 584a5afba16SPali Rohár * 3) BIOS machine ID 585a5afba16SPali Rohár * 4) Cpu temperature 586a5afba16SPali Rohár * 5) Left fan status 587a5afba16SPali Rohár * 6) Right fan status 588a5afba16SPali Rohár * 7) Left fan speed 589a5afba16SPali Rohár * 8) Right fan speed 590a5afba16SPali Rohár * 9) AC power 591a5afba16SPali Rohár * 10) Fn Key status 592a5afba16SPali Rohár */ 593a5afba16SPali Rohár seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n", 594a5afba16SPali Rohár I8K_PROC_FMT, 595ba04d73cSArmin Wolf data->bios_version, 596ba04d73cSArmin Wolf (restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : data->bios_machineid, 597a5afba16SPali Rohár cpu_temp, 598a5afba16SPali Rohár left_fan, right_fan, left_speed, right_speed, 599a5afba16SPali Rohár ac_power, fn_key); 600a5afba16SPali Rohár 601a5afba16SPali Rohár return 0; 602a5afba16SPali Rohár } 603a5afba16SPali Rohár 604a5afba16SPali Rohár static int i8k_open_fs(struct inode *inode, struct file *file) 605a5afba16SPali Rohár { 606ba04d73cSArmin Wolf return single_open(file, i8k_proc_show, PDE_DATA(inode)); 607a5afba16SPali Rohár } 608a5afba16SPali Rohár 60997a32539SAlexey Dobriyan static const struct proc_ops i8k_proc_ops = { 61097a32539SAlexey Dobriyan .proc_open = i8k_open_fs, 61197a32539SAlexey Dobriyan .proc_read = seq_read, 61297a32539SAlexey Dobriyan .proc_lseek = seq_lseek, 61397a32539SAlexey Dobriyan .proc_release = single_release, 61497a32539SAlexey Dobriyan .proc_ioctl = i8k_ioctl, 615039ae585SPali Rohár }; 616039ae585SPali Rohár 617a2cb66b4SArmin Wolf static void i8k_exit_procfs(void *param) 618039ae585SPali Rohár { 619039ae585SPali Rohár remove_proc_entry("i8k", NULL); 620039ae585SPali Rohár } 621039ae585SPali Rohár 622a2cb66b4SArmin Wolf static void __init i8k_init_procfs(struct device *dev) 623039ae585SPali Rohár { 624ba04d73cSArmin Wolf struct dell_smm_data *data = dev_get_drvdata(dev); 625ba04d73cSArmin Wolf 626a2cb66b4SArmin Wolf /* Register the proc entry */ 627ba04d73cSArmin Wolf proc_create_data("i8k", 0, NULL, &i8k_proc_ops, data); 628a2cb66b4SArmin Wolf 629a2cb66b4SArmin Wolf devm_add_action_or_reset(dev, i8k_exit_procfs, NULL); 630039ae585SPali Rohár } 631039ae585SPali Rohár 632a2cb66b4SArmin Wolf #else 633a2cb66b4SArmin Wolf 634a2cb66b4SArmin Wolf static void __init i8k_init_procfs(struct device *dev) 635039ae585SPali Rohár { 636039ae585SPali Rohár } 637039ae585SPali Rohár 638039ae585SPali Rohár #endif 639a5afba16SPali Rohár 640a5afba16SPali Rohár /* 641a5afba16SPali Rohár * Hwmon interface 642a5afba16SPali Rohár */ 643a5afba16SPali Rohár 644deeba244SArmin Wolf static umode_t dell_smm_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr, 645deeba244SArmin Wolf int channel) 646a5afba16SPali Rohár { 647deeba244SArmin Wolf const struct dell_smm_data *data = drvdata; 648a5afba16SPali Rohár 649deeba244SArmin Wolf switch (type) { 650deeba244SArmin Wolf case hwmon_temp: 651deeba244SArmin Wolf switch (attr) { 652deeba244SArmin Wolf case hwmon_temp_input: 653deeba244SArmin Wolf case hwmon_temp_label: 654deeba244SArmin Wolf if (data->temp_type[channel] >= 0) 655deeba244SArmin Wolf return 0444; 656deeba244SArmin Wolf 657deeba244SArmin Wolf break; 658deeba244SArmin Wolf default: 659deeba244SArmin Wolf break; 660deeba244SArmin Wolf } 661deeba244SArmin Wolf break; 662deeba244SArmin Wolf case hwmon_fan: 663deeba244SArmin Wolf if (data->disallow_fan_support) 664deeba244SArmin Wolf break; 665deeba244SArmin Wolf 666deeba244SArmin Wolf switch (attr) { 667deeba244SArmin Wolf case hwmon_fan_input: 668deeba244SArmin Wolf if (data->fan[channel]) 669deeba244SArmin Wolf return 0444; 670deeba244SArmin Wolf 671deeba244SArmin Wolf break; 672deeba244SArmin Wolf case hwmon_fan_label: 673deeba244SArmin Wolf if (data->fan[channel] && !data->disallow_fan_type_call) 674deeba244SArmin Wolf return 0444; 675deeba244SArmin Wolf 676deeba244SArmin Wolf break; 677b1986c8eSArmin Wolf case hwmon_fan_min: 678b1986c8eSArmin Wolf case hwmon_fan_max: 679b1986c8eSArmin Wolf case hwmon_fan_target: 680b1986c8eSArmin Wolf if (data->fan_nominal_speed[channel]) 681b1986c8eSArmin Wolf return 0444; 682b1986c8eSArmin Wolf 683b1986c8eSArmin Wolf break; 684deeba244SArmin Wolf default: 685deeba244SArmin Wolf break; 686deeba244SArmin Wolf } 687deeba244SArmin Wolf break; 688deeba244SArmin Wolf case hwmon_pwm: 689deeba244SArmin Wolf if (data->disallow_fan_support) 690deeba244SArmin Wolf break; 691deeba244SArmin Wolf 692deeba244SArmin Wolf switch (attr) { 693deeba244SArmin Wolf case hwmon_pwm_input: 694deeba244SArmin Wolf if (data->fan[channel]) 695deeba244SArmin Wolf return 0644; 696deeba244SArmin Wolf 697deeba244SArmin Wolf break; 698deeba244SArmin Wolf case hwmon_pwm_enable: 699deeba244SArmin Wolf if (data->auto_fan) 700deeba244SArmin Wolf /* 701deeba244SArmin Wolf * There is no command for retrieve the current status 702deeba244SArmin Wolf * from BIOS, and userspace/firmware itself can change 703deeba244SArmin Wolf * it. 704deeba244SArmin Wolf * Thus we can only provide write-only access for now. 705deeba244SArmin Wolf */ 706deeba244SArmin Wolf return 0200; 707deeba244SArmin Wolf 708deeba244SArmin Wolf break; 709deeba244SArmin Wolf default: 710deeba244SArmin Wolf break; 711deeba244SArmin Wolf } 712deeba244SArmin Wolf break; 713deeba244SArmin Wolf default: 714deeba244SArmin Wolf break; 715a5afba16SPali Rohár } 716a5afba16SPali Rohár 717deeba244SArmin Wolf return 0; 718a5afba16SPali Rohár } 719a5afba16SPali Rohár 720deeba244SArmin Wolf static int dell_smm_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, 721deeba244SArmin Wolf long *val) 722a5afba16SPali Rohár { 723ba04d73cSArmin Wolf struct dell_smm_data *data = dev_get_drvdata(dev); 724deeba244SArmin Wolf int ret; 725a5afba16SPali Rohár 726deeba244SArmin Wolf switch (type) { 727deeba244SArmin Wolf case hwmon_temp: 728deeba244SArmin Wolf switch (attr) { 729deeba244SArmin Wolf case hwmon_temp_input: 730deeba244SArmin Wolf ret = i8k_get_temp(channel); 731deeba244SArmin Wolf if (ret < 0) 732deeba244SArmin Wolf return ret; 733deeba244SArmin Wolf 734deeba244SArmin Wolf *val = ret * 1000; 735deeba244SArmin Wolf 736deeba244SArmin Wolf return 0; 737deeba244SArmin Wolf default: 738deeba244SArmin Wolf break; 739deeba244SArmin Wolf } 740deeba244SArmin Wolf break; 741deeba244SArmin Wolf case hwmon_fan: 742deeba244SArmin Wolf switch (attr) { 743deeba244SArmin Wolf case hwmon_fan_input: 744deeba244SArmin Wolf ret = i8k_get_fan_speed(data, channel); 745deeba244SArmin Wolf if (ret < 0) 746deeba244SArmin Wolf return ret; 747deeba244SArmin Wolf 748deeba244SArmin Wolf *val = ret; 749deeba244SArmin Wolf 750deeba244SArmin Wolf return 0; 751b1986c8eSArmin Wolf case hwmon_fan_min: 752b1986c8eSArmin Wolf *val = data->fan_nominal_speed[channel][0]; 753b1986c8eSArmin Wolf 754b1986c8eSArmin Wolf return 0; 755b1986c8eSArmin Wolf case hwmon_fan_max: 756b1986c8eSArmin Wolf *val = data->fan_nominal_speed[channel][data->i8k_fan_max]; 757b1986c8eSArmin Wolf 758b1986c8eSArmin Wolf return 0; 759b1986c8eSArmin Wolf case hwmon_fan_target: 760b1986c8eSArmin Wolf ret = i8k_get_fan_status(data, channel); 761b1986c8eSArmin Wolf if (ret < 0) 762b1986c8eSArmin Wolf return ret; 763b1986c8eSArmin Wolf 764b1986c8eSArmin Wolf if (ret > data->i8k_fan_max) 765b1986c8eSArmin Wolf ret = data->i8k_fan_max; 766b1986c8eSArmin Wolf 767b1986c8eSArmin Wolf *val = data->fan_nominal_speed[channel][ret]; 768b1986c8eSArmin Wolf 769b1986c8eSArmin Wolf return 0; 770deeba244SArmin Wolf default: 771deeba244SArmin Wolf break; 772deeba244SArmin Wolf } 773deeba244SArmin Wolf break; 774deeba244SArmin Wolf case hwmon_pwm: 775deeba244SArmin Wolf switch (attr) { 776deeba244SArmin Wolf case hwmon_pwm_input: 777deeba244SArmin Wolf ret = i8k_get_fan_status(data, channel); 778deeba244SArmin Wolf if (ret < 0) 779deeba244SArmin Wolf return ret; 780deeba244SArmin Wolf 781deeba244SArmin Wolf *val = clamp_val(ret * data->i8k_pwm_mult, 0, 255); 782deeba244SArmin Wolf 783deeba244SArmin Wolf return 0; 784deeba244SArmin Wolf default: 785deeba244SArmin Wolf break; 786deeba244SArmin Wolf } 787deeba244SArmin Wolf break; 788deeba244SArmin Wolf default: 789deeba244SArmin Wolf break; 790deeba244SArmin Wolf } 791deeba244SArmin Wolf 792deeba244SArmin Wolf return -EOPNOTSUPP; 793deeba244SArmin Wolf } 794deeba244SArmin Wolf 795deeba244SArmin Wolf static const char *dell_smm_fan_label(struct dell_smm_data *data, int channel) 796deeba244SArmin Wolf { 797deeba244SArmin Wolf bool dock = false; 798deeba244SArmin Wolf int type = i8k_get_fan_type(data, channel); 799deeba244SArmin Wolf 800a5afba16SPali Rohár if (type < 0) 801deeba244SArmin Wolf return ERR_PTR(type); 802a5afba16SPali Rohár 803a5afba16SPali Rohár if (type & 0x10) { 804a5afba16SPali Rohár dock = true; 805a5afba16SPali Rohár type &= 0x0F; 806a5afba16SPali Rohár } 807a5afba16SPali Rohár 808deeba244SArmin Wolf if (type >= ARRAY_SIZE(fan_labels)) 809deeba244SArmin Wolf type = ARRAY_SIZE(fan_labels) - 1; 810a5afba16SPali Rohár 811deeba244SArmin Wolf return dock ? docking_labels[type] : fan_labels[type]; 812a5afba16SPali Rohár } 813a5afba16SPali Rohár 814deeba244SArmin Wolf static int dell_smm_read_string(struct device *dev, enum hwmon_sensor_types type, u32 attr, 815deeba244SArmin Wolf int channel, const char **str) 816a5afba16SPali Rohár { 817ba04d73cSArmin Wolf struct dell_smm_data *data = dev_get_drvdata(dev); 818a5afba16SPali Rohár 819deeba244SArmin Wolf switch (type) { 820deeba244SArmin Wolf case hwmon_temp: 821deeba244SArmin Wolf switch (attr) { 822deeba244SArmin Wolf case hwmon_temp_label: 823deeba244SArmin Wolf *str = temp_labels[data->temp_type[channel]]; 824deeba244SArmin Wolf return 0; 825deeba244SArmin Wolf default: 826deeba244SArmin Wolf break; 827deeba244SArmin Wolf } 828deeba244SArmin Wolf break; 829deeba244SArmin Wolf case hwmon_fan: 830deeba244SArmin Wolf switch (attr) { 831deeba244SArmin Wolf case hwmon_fan_label: 832deeba244SArmin Wolf *str = dell_smm_fan_label(data, channel); 833deeba244SArmin Wolf return PTR_ERR_OR_ZERO(*str); 834deeba244SArmin Wolf default: 835deeba244SArmin Wolf break; 836deeba244SArmin Wolf } 837deeba244SArmin Wolf break; 838deeba244SArmin Wolf default: 839deeba244SArmin Wolf break; 840a5afba16SPali Rohár } 841a5afba16SPali Rohár 842deeba244SArmin Wolf return -EOPNOTSUPP; 843a5afba16SPali Rohár } 844a5afba16SPali Rohár 845deeba244SArmin Wolf static int dell_smm_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, 846deeba244SArmin Wolf long val) 847a5afba16SPali Rohár { 848ba04d73cSArmin Wolf struct dell_smm_data *data = dev_get_drvdata(dev); 849deeba244SArmin Wolf unsigned long pwm; 850deeba244SArmin Wolf bool enable; 851a5afba16SPali Rohár int err; 852a5afba16SPali Rohár 853deeba244SArmin Wolf switch (type) { 854deeba244SArmin Wolf case hwmon_pwm: 855deeba244SArmin Wolf switch (attr) { 856deeba244SArmin Wolf case hwmon_pwm_input: 857deeba244SArmin Wolf pwm = clamp_val(DIV_ROUND_CLOSEST(val, data->i8k_pwm_mult), 0, 858deeba244SArmin Wolf data->i8k_fan_max); 859a5afba16SPali Rohár 860ba04d73cSArmin Wolf mutex_lock(&data->i8k_mutex); 861deeba244SArmin Wolf err = i8k_set_fan(data, channel, pwm); 862ba04d73cSArmin Wolf mutex_unlock(&data->i8k_mutex); 863a5afba16SPali Rohár 864deeba244SArmin Wolf if (err < 0) 865afe45277SGiovanni Mascellani return err; 866afe45277SGiovanni Mascellani 867deeba244SArmin Wolf return 0; 868deeba244SArmin Wolf case hwmon_pwm_enable: 869deeba244SArmin Wolf if (!val) 870deeba244SArmin Wolf return -EINVAL; 871deeba244SArmin Wolf 872afe45277SGiovanni Mascellani if (val == 1) 873afe45277SGiovanni Mascellani enable = false; 874afe45277SGiovanni Mascellani else 875deeba244SArmin Wolf enable = true; 876afe45277SGiovanni Mascellani 877ba04d73cSArmin Wolf mutex_lock(&data->i8k_mutex); 878ba04d73cSArmin Wolf err = i8k_enable_fan_auto_mode(data, enable); 879ba04d73cSArmin Wolf mutex_unlock(&data->i8k_mutex); 880afe45277SGiovanni Mascellani 881deeba244SArmin Wolf if (err < 0) 882deeba244SArmin Wolf return err; 883deeba244SArmin Wolf 884deeba244SArmin Wolf return 0; 885deeba244SArmin Wolf default: 886deeba244SArmin Wolf break; 887deeba244SArmin Wolf } 888deeba244SArmin Wolf break; 889deeba244SArmin Wolf default: 890deeba244SArmin Wolf break; 891afe45277SGiovanni Mascellani } 892afe45277SGiovanni Mascellani 893deeba244SArmin Wolf return -EOPNOTSUPP; 894deeba244SArmin Wolf } 895a5afba16SPali Rohár 896deeba244SArmin Wolf static const struct hwmon_ops dell_smm_ops = { 897deeba244SArmin Wolf .is_visible = dell_smm_is_visible, 898deeba244SArmin Wolf .read = dell_smm_read, 899deeba244SArmin Wolf .read_string = dell_smm_read_string, 900deeba244SArmin Wolf .write = dell_smm_write, 901deeba244SArmin Wolf }; 902deeba244SArmin Wolf 903deeba244SArmin Wolf static const struct hwmon_channel_info *dell_smm_info[] = { 904deeba244SArmin Wolf HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ), 905deeba244SArmin Wolf HWMON_CHANNEL_INFO(temp, 906deeba244SArmin Wolf HWMON_T_INPUT | HWMON_T_LABEL, 907deeba244SArmin Wolf HWMON_T_INPUT | HWMON_T_LABEL, 908deeba244SArmin Wolf HWMON_T_INPUT | HWMON_T_LABEL, 909deeba244SArmin Wolf HWMON_T_INPUT | HWMON_T_LABEL, 910deeba244SArmin Wolf HWMON_T_INPUT | HWMON_T_LABEL, 911deeba244SArmin Wolf HWMON_T_INPUT | HWMON_T_LABEL, 912deeba244SArmin Wolf HWMON_T_INPUT | HWMON_T_LABEL, 913deeba244SArmin Wolf HWMON_T_INPUT | HWMON_T_LABEL, 914deeba244SArmin Wolf HWMON_T_INPUT | HWMON_T_LABEL, 915deeba244SArmin Wolf HWMON_T_INPUT | HWMON_T_LABEL 916deeba244SArmin Wolf ), 917deeba244SArmin Wolf HWMON_CHANNEL_INFO(fan, 918b1986c8eSArmin Wolf HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MIN | HWMON_F_MAX | 919b1986c8eSArmin Wolf HWMON_F_TARGET, 920b1986c8eSArmin Wolf HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MIN | HWMON_F_MAX | 921b1986c8eSArmin Wolf HWMON_F_TARGET, 922b1986c8eSArmin Wolf HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MIN | HWMON_F_MAX | 923b1986c8eSArmin Wolf HWMON_F_TARGET 924deeba244SArmin Wolf ), 925deeba244SArmin Wolf HWMON_CHANNEL_INFO(pwm, 926deeba244SArmin Wolf HWMON_PWM_INPUT | HWMON_PWM_ENABLE, 927deeba244SArmin Wolf HWMON_PWM_INPUT, 928deeba244SArmin Wolf HWMON_PWM_INPUT 929deeba244SArmin Wolf ), 930a5afba16SPali Rohár NULL 931a5afba16SPali Rohár }; 932a5afba16SPali Rohár 933deeba244SArmin Wolf static const struct hwmon_chip_info dell_smm_chip_info = { 934deeba244SArmin Wolf .ops = &dell_smm_ops, 935deeba244SArmin Wolf .info = dell_smm_info, 936a5afba16SPali Rohár }; 937a5afba16SPali Rohár 9381492fa21SArmin Wolf static int __init dell_smm_init_hwmon(struct device *dev) 939a5afba16SPali Rohár { 940ba04d73cSArmin Wolf struct dell_smm_data *data = dev_get_drvdata(dev); 941deeba244SArmin Wolf struct device *dell_smm_hwmon_dev; 942b1986c8eSArmin Wolf int i, state, err; 943a5afba16SPali Rohár 944deeba244SArmin Wolf for (i = 0; i < DELL_SMM_NO_TEMP; i++) { 945deeba244SArmin Wolf data->temp_type[i] = i8k_get_temp_type(i); 946deeba244SArmin Wolf if (data->temp_type[i] < 0) 947deeba244SArmin Wolf continue; 948a5afba16SPali Rohár 949deeba244SArmin Wolf if (data->temp_type[i] >= ARRAY_SIZE(temp_labels)) 950deeba244SArmin Wolf data->temp_type[i] = ARRAY_SIZE(temp_labels) - 1; 951deeba244SArmin Wolf } 952deeba244SArmin Wolf 953deeba244SArmin Wolf for (i = 0; i < DELL_SMM_NO_FANS; i++) { 954deeba244SArmin Wolf data->fan_type[i] = INT_MIN; 955deeba244SArmin Wolf err = i8k_get_fan_status(data, i); 9565ce91714SPali Rohár if (err < 0) 957deeba244SArmin Wolf err = i8k_get_fan_type(data, i); 958b1986c8eSArmin Wolf 959b1986c8eSArmin Wolf if (err < 0) 960b1986c8eSArmin Wolf continue; 961b1986c8eSArmin Wolf 962deeba244SArmin Wolf data->fan[i] = true; 963b1986c8eSArmin Wolf data->fan_nominal_speed[i] = devm_kmalloc_array(dev, data->i8k_fan_max + 1, 964b1986c8eSArmin Wolf sizeof(*data->fan_nominal_speed[i]), 965b1986c8eSArmin Wolf GFP_KERNEL); 966b1986c8eSArmin Wolf if (!data->fan_nominal_speed[i]) 967b1986c8eSArmin Wolf continue; 968b1986c8eSArmin Wolf 969b1986c8eSArmin Wolf for (state = 0; state <= data->i8k_fan_max; state++) { 970b1986c8eSArmin Wolf err = i8k_get_fan_nominal_speed(data, i, state); 971b1986c8eSArmin Wolf if (err < 0) { 972b1986c8eSArmin Wolf /* Mark nominal speed table as invalid in case of error */ 973b1986c8eSArmin Wolf devm_kfree(dev, data->fan_nominal_speed[i]); 974b1986c8eSArmin Wolf data->fan_nominal_speed[i] = NULL; 975b1986c8eSArmin Wolf break; 976b1986c8eSArmin Wolf } 977b1986c8eSArmin Wolf data->fan_nominal_speed[i][state] = err; 978b1986c8eSArmin Wolf } 979deeba244SArmin Wolf } 980a5afba16SPali Rohár 981deeba244SArmin Wolf dell_smm_hwmon_dev = devm_hwmon_device_register_with_info(dev, "dell_smm", data, 982deeba244SArmin Wolf &dell_smm_chip_info, NULL); 983a5afba16SPali Rohár 984deeba244SArmin Wolf return PTR_ERR_OR_ZERO(dell_smm_hwmon_dev); 985a5afba16SPali Rohár } 986a5afba16SPali Rohár 987a5afba16SPali Rohár struct i8k_config_data { 988a5afba16SPali Rohár uint fan_mult; 989a5afba16SPali Rohár uint fan_max; 990a5afba16SPali Rohár }; 991a5afba16SPali Rohár 992a5afba16SPali Rohár enum i8k_configs { 993a5afba16SPali Rohár DELL_LATITUDE_D520, 994a5afba16SPali Rohár DELL_PRECISION_490, 995a5afba16SPali Rohár DELL_STUDIO, 996a5afba16SPali Rohár DELL_XPS, 997a5afba16SPali Rohár }; 998a5afba16SPali Rohár 999c510f6acSArmin Wolf static const struct i8k_config_data i8k_config_data[] __initconst = { 1000a5afba16SPali Rohár [DELL_LATITUDE_D520] = { 1001a5afba16SPali Rohár .fan_mult = 1, 1002a5afba16SPali Rohár .fan_max = I8K_FAN_TURBO, 1003a5afba16SPali Rohár }, 1004a5afba16SPali Rohár [DELL_PRECISION_490] = { 1005a5afba16SPali Rohár .fan_mult = 1, 1006a5afba16SPali Rohár .fan_max = I8K_FAN_TURBO, 1007a5afba16SPali Rohár }, 1008a5afba16SPali Rohár [DELL_STUDIO] = { 1009a5afba16SPali Rohár .fan_mult = 1, 1010a5afba16SPali Rohár .fan_max = I8K_FAN_HIGH, 1011a5afba16SPali Rohár }, 1012a5afba16SPali Rohár [DELL_XPS] = { 1013a5afba16SPali Rohár .fan_mult = 1, 1014a5afba16SPali Rohár .fan_max = I8K_FAN_HIGH, 1015a5afba16SPali Rohár }, 1016a5afba16SPali Rohár }; 1017a5afba16SPali Rohár 10186faadbbbSChristoph Hellwig static const struct dmi_system_id i8k_dmi_table[] __initconst = { 1019a5afba16SPali Rohár { 1020a5afba16SPali Rohár .ident = "Dell Inspiron", 1021a5afba16SPali Rohár .matches = { 1022a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"), 1023a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"), 1024a5afba16SPali Rohár }, 1025a5afba16SPali Rohár }, 1026a5afba16SPali Rohár { 1027a5afba16SPali Rohár .ident = "Dell Latitude", 1028a5afba16SPali Rohár .matches = { 1029a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"), 1030a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"), 1031a5afba16SPali Rohár }, 1032a5afba16SPali Rohár }, 1033a5afba16SPali Rohár { 1034a5afba16SPali Rohár .ident = "Dell Inspiron 2", 1035a5afba16SPali Rohár .matches = { 1036a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1037a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"), 1038a5afba16SPali Rohár }, 1039a5afba16SPali Rohár }, 1040a5afba16SPali Rohár { 1041a5afba16SPali Rohár .ident = "Dell Latitude D520", 1042a5afba16SPali Rohár .matches = { 1043a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1044a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"), 1045a5afba16SPali Rohár }, 1046a5afba16SPali Rohár .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520], 1047a5afba16SPali Rohár }, 1048a5afba16SPali Rohár { 1049a5afba16SPali Rohár .ident = "Dell Latitude 2", 1050a5afba16SPali Rohár .matches = { 1051a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1052a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"), 1053a5afba16SPali Rohár }, 1054a5afba16SPali Rohár }, 1055a5afba16SPali Rohár { /* UK Inspiron 6400 */ 1056a5afba16SPali Rohár .ident = "Dell Inspiron 3", 1057a5afba16SPali Rohár .matches = { 1058a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1059a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, "MM061"), 1060a5afba16SPali Rohár }, 1061a5afba16SPali Rohár }, 1062a5afba16SPali Rohár { 1063a5afba16SPali Rohár .ident = "Dell Inspiron 3", 1064a5afba16SPali Rohár .matches = { 1065a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1066a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, "MP061"), 1067a5afba16SPali Rohár }, 1068a5afba16SPali Rohár }, 1069a5afba16SPali Rohár { 1070a5afba16SPali Rohár .ident = "Dell Precision 490", 1071a5afba16SPali Rohár .matches = { 1072a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1073a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, 1074a5afba16SPali Rohár "Precision WorkStation 490"), 1075a5afba16SPali Rohár }, 1076a5afba16SPali Rohár .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490], 1077a5afba16SPali Rohár }, 1078a5afba16SPali Rohár { 1079a5afba16SPali Rohár .ident = "Dell Precision", 1080a5afba16SPali Rohár .matches = { 1081a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1082a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, "Precision"), 1083a5afba16SPali Rohár }, 1084a5afba16SPali Rohár }, 1085a5afba16SPali Rohár { 1086a5afba16SPali Rohár .ident = "Dell Vostro", 1087a5afba16SPali Rohár .matches = { 1088a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1089a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"), 1090a5afba16SPali Rohár }, 1091a5afba16SPali Rohár }, 1092a5afba16SPali Rohár { 1093a5afba16SPali Rohár .ident = "Dell Studio", 1094a5afba16SPali Rohár .matches = { 1095a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1096a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, "Studio"), 1097a5afba16SPali Rohár }, 1098a5afba16SPali Rohár .driver_data = (void *)&i8k_config_data[DELL_STUDIO], 1099a5afba16SPali Rohár }, 1100a5afba16SPali Rohár { 1101a5afba16SPali Rohár .ident = "Dell XPS M140", 1102a5afba16SPali Rohár .matches = { 1103a5afba16SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1104a5afba16SPali Rohár DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"), 1105a5afba16SPali Rohár }, 1106a5afba16SPali Rohár .driver_data = (void *)&i8k_config_data[DELL_XPS], 1107a5afba16SPali Rohár }, 1108a4811b6cSPali Rohár { 1109b8a13e5eSThomas Hebb .ident = "Dell XPS", 1110a4811b6cSPali Rohár .matches = { 1111a4811b6cSPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1112b8a13e5eSThomas Hebb DMI_MATCH(DMI_PRODUCT_NAME, "XPS"), 1113162372b0SMichele Sorcinelli }, 1114162372b0SMichele Sorcinelli }, 1115a5afba16SPali Rohár { } 1116a5afba16SPali Rohár }; 1117a5afba16SPali Rohár 1118a5afba16SPali Rohár MODULE_DEVICE_TABLE(dmi, i8k_dmi_table); 1119a5afba16SPali Rohár 1120a4b45b25SPali Rohár /* 11212744d2fdSPali Rohár * On some machines once I8K_SMM_GET_FAN_TYPE is issued then CPU fan speed 11222744d2fdSPali Rohár * randomly going up and down due to bug in Dell SMM or BIOS. Here is blacklist 11232744d2fdSPali Rohár * of affected Dell machines for which we disallow I8K_SMM_GET_FAN_TYPE call. 11242744d2fdSPali Rohár * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=100121 11256220f4ebSThorsten Leemhuis */ 11266faadbbbSChristoph Hellwig static const struct dmi_system_id i8k_blacklist_fan_type_dmi_table[] __initconst = { 11272744d2fdSPali Rohár { 11286220f4ebSThorsten Leemhuis .ident = "Dell Studio XPS 8000", 11296220f4ebSThorsten Leemhuis .matches = { 11306220f4ebSThorsten Leemhuis DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 11316220f4ebSThorsten Leemhuis DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8000"), 11326220f4ebSThorsten Leemhuis }, 11336220f4ebSThorsten Leemhuis }, 11346220f4ebSThorsten Leemhuis { 1135a4b45b25SPali Rohár .ident = "Dell Studio XPS 8100", 1136a4b45b25SPali Rohár .matches = { 1137a4b45b25SPali Rohár DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1138a4b45b25SPali Rohár DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8100"), 1139a4b45b25SPali Rohár }, 1140a4b45b25SPali Rohár }, 11412744d2fdSPali Rohár { 11422744d2fdSPali Rohár .ident = "Dell Inspiron 580", 11432744d2fdSPali Rohár .matches = { 11442744d2fdSPali Rohár DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 11452744d2fdSPali Rohár DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 580 "), 11462744d2fdSPali Rohár }, 11472744d2fdSPali Rohár }, 1148a4b45b25SPali Rohár { } 1149a4b45b25SPali Rohár }; 1150a4b45b25SPali Rohár 1151a5afba16SPali Rohár /* 1152f480ea90SPali Rohár * On some machines all fan related SMM functions implemented by Dell BIOS 1153f480ea90SPali Rohár * firmware freeze kernel for about 500ms. Until Dell fixes these problems fan 1154f480ea90SPali Rohár * support for affected blacklisted Dell machines stay disabled. 1155f480ea90SPali Rohár * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=195751 1156f480ea90SPali Rohár */ 1157c510f6acSArmin Wolf static const struct dmi_system_id i8k_blacklist_fan_support_dmi_table[] __initconst = { 1158f480ea90SPali Rohár { 1159f480ea90SPali Rohár .ident = "Dell Inspiron 7720", 1160f480ea90SPali Rohár .matches = { 1161f480ea90SPali Rohár DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1162f480ea90SPali Rohár DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"), 1163f480ea90SPali Rohár }, 1164f480ea90SPali Rohár }, 11656fbc4232SOleksandr Natalenko { 11666fbc4232SOleksandr Natalenko .ident = "Dell Vostro 3360", 11676fbc4232SOleksandr Natalenko .matches = { 11686fbc4232SOleksandr Natalenko DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 11696fbc4232SOleksandr Natalenko DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"), 11706fbc4232SOleksandr Natalenko }, 11716fbc4232SOleksandr Natalenko }, 1172536e0019SHelge Eichelberg { 1173536e0019SHelge Eichelberg .ident = "Dell XPS13 9333", 1174536e0019SHelge Eichelberg .matches = { 1175536e0019SHelge Eichelberg DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1176536e0019SHelge Eichelberg DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"), 1177536e0019SHelge Eichelberg }, 1178536e0019SHelge Eichelberg }, 11794008bc7dSThomas Hebb { 11804008bc7dSThomas Hebb .ident = "Dell XPS 15 L502X", 11814008bc7dSThomas Hebb .matches = { 11824008bc7dSThomas Hebb DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 11834008bc7dSThomas Hebb DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L502X"), 11844008bc7dSThomas Hebb }, 11854008bc7dSThomas Hebb }, 1186f480ea90SPali Rohár { } 1187f480ea90SPali Rohár }; 1188f480ea90SPali Rohár 1189afe45277SGiovanni Mascellani struct i8k_fan_control_data { 1190afe45277SGiovanni Mascellani unsigned int manual_fan; 1191afe45277SGiovanni Mascellani unsigned int auto_fan; 1192afe45277SGiovanni Mascellani }; 1193afe45277SGiovanni Mascellani 1194afe45277SGiovanni Mascellani enum i8k_fan_controls { 1195afe45277SGiovanni Mascellani I8K_FAN_34A3_35A3, 1196afe45277SGiovanni Mascellani }; 1197afe45277SGiovanni Mascellani 1198c510f6acSArmin Wolf static const struct i8k_fan_control_data i8k_fan_control_data[] __initconst = { 1199afe45277SGiovanni Mascellani [I8K_FAN_34A3_35A3] = { 1200afe45277SGiovanni Mascellani .manual_fan = 0x34a3, 1201afe45277SGiovanni Mascellani .auto_fan = 0x35a3, 1202afe45277SGiovanni Mascellani }, 1203afe45277SGiovanni Mascellani }; 1204afe45277SGiovanni Mascellani 1205c510f6acSArmin Wolf static const struct dmi_system_id i8k_whitelist_fan_control[] __initconst = { 1206afe45277SGiovanni Mascellani { 12070ca8bb2cSJeffrey Lin .ident = "Dell Latitude 5480", 12080ca8bb2cSJeffrey Lin .matches = { 12090ca8bb2cSJeffrey Lin DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 12100ca8bb2cSJeffrey Lin DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude 5480"), 12110ca8bb2cSJeffrey Lin }, 12120ca8bb2cSJeffrey Lin .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3], 12130ca8bb2cSJeffrey Lin }, 12140ca8bb2cSJeffrey Lin { 1215afe45277SGiovanni Mascellani .ident = "Dell Latitude E6440", 1216afe45277SGiovanni Mascellani .matches = { 1217afe45277SGiovanni Mascellani DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1218afe45277SGiovanni Mascellani DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude E6440"), 1219afe45277SGiovanni Mascellani }, 1220afe45277SGiovanni Mascellani .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3], 1221afe45277SGiovanni Mascellani }, 1222807b8c29SSebastian Oechsle { 1223807b8c29SSebastian Oechsle .ident = "Dell Latitude E7440", 1224807b8c29SSebastian Oechsle .matches = { 1225807b8c29SSebastian Oechsle DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1226807b8c29SSebastian Oechsle DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude E7440"), 1227807b8c29SSebastian Oechsle }, 1228807b8c29SSebastian Oechsle .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3], 1229807b8c29SSebastian Oechsle }, 123095d88d05SCarlos Alberto Lopez Perez { 123195d88d05SCarlos Alberto Lopez Perez .ident = "Dell Precision 5530", 123295d88d05SCarlos Alberto Lopez Perez .matches = { 123395d88d05SCarlos Alberto Lopez Perez DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 123495d88d05SCarlos Alberto Lopez Perez DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Precision 5530"), 123595d88d05SCarlos Alberto Lopez Perez }, 123695d88d05SCarlos Alberto Lopez Perez .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3], 123795d88d05SCarlos Alberto Lopez Perez }, 123895d88d05SCarlos Alberto Lopez Perez { 123995d88d05SCarlos Alberto Lopez Perez .ident = "Dell Precision 7510", 124095d88d05SCarlos Alberto Lopez Perez .matches = { 124195d88d05SCarlos Alberto Lopez Perez DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 124295d88d05SCarlos Alberto Lopez Perez DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Precision 7510"), 124395d88d05SCarlos Alberto Lopez Perez }, 124495d88d05SCarlos Alberto Lopez Perez .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3], 124595d88d05SCarlos Alberto Lopez Perez }, 1246afe45277SGiovanni Mascellani { } 1247afe45277SGiovanni Mascellani }; 1248afe45277SGiovanni Mascellani 12491492fa21SArmin Wolf static int __init dell_smm_probe(struct platform_device *pdev) 1250a5afba16SPali Rohár { 1251ba04d73cSArmin Wolf struct dell_smm_data *data; 1252afe45277SGiovanni Mascellani const struct dmi_system_id *id, *fan_control; 1253a5afba16SPali Rohár int fan, ret; 1254a5afba16SPali Rohár 1255ba04d73cSArmin Wolf data = devm_kzalloc(&pdev->dev, sizeof(struct dell_smm_data), GFP_KERNEL); 1256ba04d73cSArmin Wolf if (!data) 1257ba04d73cSArmin Wolf return -ENOMEM; 1258ba04d73cSArmin Wolf 1259ba04d73cSArmin Wolf mutex_init(&data->i8k_mutex); 1260ba04d73cSArmin Wolf data->i8k_fan_mult = I8K_FAN_MULT; 1261ba04d73cSArmin Wolf data->i8k_fan_max = I8K_FAN_HIGH; 1262ba04d73cSArmin Wolf platform_set_drvdata(pdev, data); 1263ba04d73cSArmin Wolf 1264f480ea90SPali Rohár if (dmi_check_system(i8k_blacklist_fan_support_dmi_table)) { 1265ba04d73cSArmin Wolf dev_warn(&pdev->dev, "broken Dell BIOS detected, disallow fan support\n"); 1266f480ea90SPali Rohár if (!force) 1267ba04d73cSArmin Wolf data->disallow_fan_support = true; 1268f480ea90SPali Rohár } 1269f480ea90SPali Rohár 1270836ad112SPali Rohár if (dmi_check_system(i8k_blacklist_fan_type_dmi_table)) { 1271ba04d73cSArmin Wolf dev_warn(&pdev->dev, "broken Dell BIOS detected, disallow fan type call\n"); 1272836ad112SPali Rohár if (!force) 1273ba04d73cSArmin Wolf data->disallow_fan_type_call = true; 1274836ad112SPali Rohár } 12752744d2fdSPali Rohár 1276ba04d73cSArmin Wolf strscpy(data->bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION), 1277ba04d73cSArmin Wolf sizeof(data->bios_version)); 1278ba04d73cSArmin Wolf strscpy(data->bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), 1279ba04d73cSArmin Wolf sizeof(data->bios_machineid)); 1280a5afba16SPali Rohár 1281a5afba16SPali Rohár /* 1282a5afba16SPali Rohár * Set fan multiplier and maximal fan speed from dmi config 1283a5afba16SPali Rohár * Values specified in module parameters override values from dmi 1284a5afba16SPali Rohár */ 1285a5afba16SPali Rohár id = dmi_first_match(i8k_dmi_table); 1286a5afba16SPali Rohár if (id && id->driver_data) { 1287a5afba16SPali Rohár const struct i8k_config_data *conf = id->driver_data; 12881492fa21SArmin Wolf 1289a5afba16SPali Rohár if (!fan_mult && conf->fan_mult) 1290a5afba16SPali Rohár fan_mult = conf->fan_mult; 1291ba04d73cSArmin Wolf 1292a5afba16SPali Rohár if (!fan_max && conf->fan_max) 1293a5afba16SPali Rohár fan_max = conf->fan_max; 1294a5afba16SPali Rohár } 1295a5afba16SPali Rohár 1296ba04d73cSArmin Wolf data->i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */ 1297ba04d73cSArmin Wolf data->i8k_pwm_mult = DIV_ROUND_UP(255, data->i8k_fan_max); 1298a5afba16SPali Rohár 1299afe45277SGiovanni Mascellani fan_control = dmi_first_match(i8k_whitelist_fan_control); 1300afe45277SGiovanni Mascellani if (fan_control && fan_control->driver_data) { 1301ba04d73cSArmin Wolf const struct i8k_fan_control_data *control = fan_control->driver_data; 1302afe45277SGiovanni Mascellani 1303ba04d73cSArmin Wolf data->manual_fan = control->manual_fan; 1304ba04d73cSArmin Wolf data->auto_fan = control->auto_fan; 1305ba04d73cSArmin Wolf dev_info(&pdev->dev, "enabling support for setting automatic/manual fan control\n"); 1306afe45277SGiovanni Mascellani } 1307afe45277SGiovanni Mascellani 1308a5afba16SPali Rohár if (!fan_mult) { 1309a5afba16SPali Rohár /* 1310a5afba16SPali Rohár * Autodetect fan multiplier based on nominal rpm 1311a5afba16SPali Rohár * If fan reports rpm value too high then set multiplier to 1 1312a5afba16SPali Rohár */ 13132757269aSArmin Wolf for (fan = 0; fan < DELL_SMM_NO_FANS; ++fan) { 1314ba04d73cSArmin Wolf ret = i8k_get_fan_nominal_speed(data, fan, data->i8k_fan_max); 1315a5afba16SPali Rohár if (ret < 0) 1316a5afba16SPali Rohár continue; 1317ba04d73cSArmin Wolf 1318a5afba16SPali Rohár if (ret > I8K_FAN_MAX_RPM) 1319ba04d73cSArmin Wolf data->i8k_fan_mult = 1; 1320a5afba16SPali Rohár break; 1321a5afba16SPali Rohár } 1322a5afba16SPali Rohár } else { 1323a5afba16SPali Rohár /* Fan multiplier was specified in module param or in dmi */ 1324ba04d73cSArmin Wolf data->i8k_fan_mult = fan_mult; 1325a5afba16SPali Rohár } 1326a5afba16SPali Rohár 13271492fa21SArmin Wolf ret = dell_smm_init_hwmon(&pdev->dev); 13281492fa21SArmin Wolf if (ret) 13291492fa21SArmin Wolf return ret; 13301492fa21SArmin Wolf 1331a2cb66b4SArmin Wolf i8k_init_procfs(&pdev->dev); 13321492fa21SArmin Wolf 13331492fa21SArmin Wolf return 0; 13341492fa21SArmin Wolf } 13351492fa21SArmin Wolf 13361492fa21SArmin Wolf static struct platform_driver dell_smm_driver = { 13371492fa21SArmin Wolf .driver = { 13381492fa21SArmin Wolf .name = KBUILD_MODNAME, 13391492fa21SArmin Wolf }, 13401492fa21SArmin Wolf }; 13411492fa21SArmin Wolf 13421492fa21SArmin Wolf static struct platform_device *dell_smm_device; 13431492fa21SArmin Wolf 13441492fa21SArmin Wolf /* 13451492fa21SArmin Wolf * Probe for the presence of a supported laptop. 13461492fa21SArmin Wolf */ 1347a5afba16SPali Rohár static int __init i8k_init(void) 1348a5afba16SPali Rohár { 13491492fa21SArmin Wolf /* 13501492fa21SArmin Wolf * Get DMI information 13511492fa21SArmin Wolf */ 13521492fa21SArmin Wolf if (!dmi_check_system(i8k_dmi_table)) { 13531492fa21SArmin Wolf if (!ignore_dmi && !force) 1354a5afba16SPali Rohár return -ENODEV; 1355a5afba16SPali Rohár 13561492fa21SArmin Wolf pr_info("not running on a supported Dell system.\n"); 13571492fa21SArmin Wolf pr_info("vendor=%s, model=%s, version=%s\n", 13581492fa21SArmin Wolf i8k_get_dmi_data(DMI_SYS_VENDOR), 13591492fa21SArmin Wolf i8k_get_dmi_data(DMI_PRODUCT_NAME), 13601492fa21SArmin Wolf i8k_get_dmi_data(DMI_BIOS_VERSION)); 13611492fa21SArmin Wolf } 1362039ae585SPali Rohár 13631492fa21SArmin Wolf /* 13641492fa21SArmin Wolf * Get SMM Dell signature 13651492fa21SArmin Wolf */ 13661492fa21SArmin Wolf if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) && 13671492fa21SArmin Wolf i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) { 13681492fa21SArmin Wolf pr_err("unable to get SMM Dell signature\n"); 13691492fa21SArmin Wolf if (!force) 13701492fa21SArmin Wolf return -ENODEV; 13711492fa21SArmin Wolf } 13721492fa21SArmin Wolf 13731492fa21SArmin Wolf dell_smm_device = platform_create_bundle(&dell_smm_driver, dell_smm_probe, NULL, 0, NULL, 13741492fa21SArmin Wolf 0); 13751492fa21SArmin Wolf 13761492fa21SArmin Wolf return PTR_ERR_OR_ZERO(dell_smm_device); 1377a5afba16SPali Rohár } 1378a5afba16SPali Rohár 1379a5afba16SPali Rohár static void __exit i8k_exit(void) 1380a5afba16SPali Rohár { 13811492fa21SArmin Wolf platform_device_unregister(dell_smm_device); 13821492fa21SArmin Wolf platform_driver_unregister(&dell_smm_driver); 1383a5afba16SPali Rohár } 1384a5afba16SPali Rohár 1385a5afba16SPali Rohár module_init(i8k_init); 1386a5afba16SPali Rohár module_exit(i8k_exit); 1387