1338 строки
30 KiB
C
1338 строки
30 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* dell-smm-hwmon.c -- Linux driver for accessing the SMM BIOS on Dell laptops.
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*
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* Copyright (C) 2001 Massimo Dal Zotto <dz@debian.org>
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*
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* Hwmon integration:
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* Copyright (C) 2011 Jean Delvare <jdelvare@suse.de>
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* Copyright (C) 2013, 2014 Guenter Roeck <linux@roeck-us.net>
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* Copyright (C) 2014, 2015 Pali Rohár <pali@kernel.org>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/cpu.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/dmi.h>
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#include <linux/capability.h>
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#include <linux/mutex.h>
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#include <linux/hwmon.h>
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#include <linux/uaccess.h>
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#include <linux/io.h>
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#include <linux/sched.h>
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#include <linux/ctype.h>
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#include <linux/smp.h>
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#include <linux/i8k.h>
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#define I8K_SMM_FN_STATUS 0x0025
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#define I8K_SMM_POWER_STATUS 0x0069
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#define I8K_SMM_SET_FAN 0x01a3
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#define I8K_SMM_GET_FAN 0x00a3
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#define I8K_SMM_GET_SPEED 0x02a3
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#define I8K_SMM_GET_FAN_TYPE 0x03a3
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#define I8K_SMM_GET_NOM_SPEED 0x04a3
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#define I8K_SMM_GET_TEMP 0x10a3
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#define I8K_SMM_GET_TEMP_TYPE 0x11a3
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#define I8K_SMM_GET_DELL_SIG1 0xfea3
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#define I8K_SMM_GET_DELL_SIG2 0xffa3
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#define I8K_FAN_MULT 30
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#define I8K_FAN_MAX_RPM 30000
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#define I8K_MAX_TEMP 127
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#define I8K_FN_NONE 0x00
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#define I8K_FN_UP 0x01
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#define I8K_FN_DOWN 0x02
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#define I8K_FN_MUTE 0x04
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#define I8K_FN_MASK 0x07
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#define I8K_FN_SHIFT 8
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#define I8K_POWER_AC 0x05
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#define I8K_POWER_BATTERY 0x01
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#define DELL_SMM_NO_TEMP 10
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#define DELL_SMM_NO_FANS 3
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struct dell_smm_data {
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struct mutex i8k_mutex; /* lock for sensors writes */
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char bios_version[4];
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char bios_machineid[16];
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uint i8k_fan_mult;
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uint i8k_pwm_mult;
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uint i8k_fan_max;
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bool disallow_fan_type_call;
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bool disallow_fan_support;
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unsigned int manual_fan;
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unsigned int auto_fan;
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int temp_type[DELL_SMM_NO_TEMP];
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bool fan[DELL_SMM_NO_FANS];
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int fan_type[DELL_SMM_NO_FANS];
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};
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MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
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MODULE_AUTHOR("Pali Rohár <pali@kernel.org>");
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MODULE_DESCRIPTION("Dell laptop SMM BIOS hwmon driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("i8k");
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static bool force;
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module_param(force, bool, 0);
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MODULE_PARM_DESC(force, "Force loading without checking for supported models");
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static bool ignore_dmi;
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module_param(ignore_dmi, bool, 0);
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MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
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#if IS_ENABLED(CONFIG_I8K)
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static bool restricted = true;
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module_param(restricted, bool, 0);
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MODULE_PARM_DESC(restricted, "Restrict fan control and serial number to CAP_SYS_ADMIN (default: 1)");
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static bool power_status;
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module_param(power_status, bool, 0600);
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MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k (default: 0)");
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#endif
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static uint fan_mult;
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module_param(fan_mult, uint, 0);
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MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)");
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static uint fan_max;
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module_param(fan_max, uint, 0);
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MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)");
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struct smm_regs {
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unsigned int eax;
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unsigned int ebx __packed;
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unsigned int ecx __packed;
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unsigned int edx __packed;
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unsigned int esi __packed;
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unsigned int edi __packed;
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};
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static const char * const temp_labels[] = {
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"CPU",
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"GPU",
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"SODIMM",
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"Other",
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"Ambient",
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"Other",
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};
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static const char * const fan_labels[] = {
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"Processor Fan",
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"Motherboard Fan",
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"Video Fan",
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"Power Supply Fan",
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"Chipset Fan",
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"Other Fan",
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};
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static const char * const docking_labels[] = {
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"Docking Processor Fan",
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"Docking Motherboard Fan",
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"Docking Video Fan",
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"Docking Power Supply Fan",
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"Docking Chipset Fan",
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"Docking Other Fan",
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};
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static inline const char __init *i8k_get_dmi_data(int field)
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{
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const char *dmi_data = dmi_get_system_info(field);
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return dmi_data && *dmi_data ? dmi_data : "?";
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}
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/*
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* Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
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*/
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static int i8k_smm_func(void *par)
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{
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ktime_t calltime = ktime_get();
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struct smm_regs *regs = par;
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int eax = regs->eax;
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int ebx = regs->ebx;
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long long duration;
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int rc;
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/* SMM requires CPU 0 */
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if (smp_processor_id() != 0)
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return -EBUSY;
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#if defined(CONFIG_X86_64)
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asm volatile("pushq %%rax\n\t"
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"movl 0(%%rax),%%edx\n\t"
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"pushq %%rdx\n\t"
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"movl 4(%%rax),%%ebx\n\t"
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"movl 8(%%rax),%%ecx\n\t"
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"movl 12(%%rax),%%edx\n\t"
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"movl 16(%%rax),%%esi\n\t"
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"movl 20(%%rax),%%edi\n\t"
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"popq %%rax\n\t"
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"out %%al,$0xb2\n\t"
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"out %%al,$0x84\n\t"
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"xchgq %%rax,(%%rsp)\n\t"
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"movl %%ebx,4(%%rax)\n\t"
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"movl %%ecx,8(%%rax)\n\t"
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"movl %%edx,12(%%rax)\n\t"
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"movl %%esi,16(%%rax)\n\t"
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"movl %%edi,20(%%rax)\n\t"
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"popq %%rdx\n\t"
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"movl %%edx,0(%%rax)\n\t"
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"pushfq\n\t"
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"popq %%rax\n\t"
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"andl $1,%%eax\n"
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: "=a"(rc)
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: "a"(regs)
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: "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
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#else
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asm volatile("pushl %%eax\n\t"
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"movl 0(%%eax),%%edx\n\t"
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"push %%edx\n\t"
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"movl 4(%%eax),%%ebx\n\t"
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"movl 8(%%eax),%%ecx\n\t"
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"movl 12(%%eax),%%edx\n\t"
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"movl 16(%%eax),%%esi\n\t"
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"movl 20(%%eax),%%edi\n\t"
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"popl %%eax\n\t"
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"out %%al,$0xb2\n\t"
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"out %%al,$0x84\n\t"
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"xchgl %%eax,(%%esp)\n\t"
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"movl %%ebx,4(%%eax)\n\t"
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"movl %%ecx,8(%%eax)\n\t"
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"movl %%edx,12(%%eax)\n\t"
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"movl %%esi,16(%%eax)\n\t"
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"movl %%edi,20(%%eax)\n\t"
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"popl %%edx\n\t"
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"movl %%edx,0(%%eax)\n\t"
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"lahf\n\t"
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"shrl $8,%%eax\n\t"
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"andl $1,%%eax\n"
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: "=a"(rc)
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: "a"(regs)
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: "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
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#endif
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if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
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rc = -EINVAL;
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duration = ktime_us_delta(ktime_get(), calltime);
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pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x (took %7lld usecs)\n", eax, ebx,
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(rc ? 0xffff : regs->eax & 0xffff), duration);
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return rc;
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}
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/*
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* Call the System Management Mode BIOS.
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*/
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static int i8k_smm(struct smm_regs *regs)
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{
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int ret;
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cpus_read_lock();
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ret = smp_call_on_cpu(0, i8k_smm_func, regs, true);
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cpus_read_unlock();
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return ret;
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}
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/*
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* Read the fan status.
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*/
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static int i8k_get_fan_status(const struct dell_smm_data *data, int fan)
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{
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struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
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if (data->disallow_fan_support)
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return -EINVAL;
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regs.ebx = fan & 0xff;
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return i8k_smm(®s) ? : regs.eax & 0xff;
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}
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/*
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* Read the fan speed in RPM.
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*/
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static int i8k_get_fan_speed(const struct dell_smm_data *data, int fan)
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{
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struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
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if (data->disallow_fan_support)
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return -EINVAL;
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regs.ebx = fan & 0xff;
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return i8k_smm(®s) ? : (regs.eax & 0xffff) * data->i8k_fan_mult;
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}
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/*
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* Read the fan type.
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*/
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static int _i8k_get_fan_type(const struct dell_smm_data *data, int fan)
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{
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struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, };
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if (data->disallow_fan_support || data->disallow_fan_type_call)
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return -EINVAL;
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regs.ebx = fan & 0xff;
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return i8k_smm(®s) ? : regs.eax & 0xff;
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}
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static int i8k_get_fan_type(struct dell_smm_data *data, int fan)
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{
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/* I8K_SMM_GET_FAN_TYPE SMM call is expensive, so cache values */
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if (data->fan_type[fan] == INT_MIN)
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data->fan_type[fan] = _i8k_get_fan_type(data, fan);
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return data->fan_type[fan];
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}
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/*
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* Read the fan nominal rpm for specific fan speed.
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*/
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static int __init i8k_get_fan_nominal_speed(const struct dell_smm_data *data, int fan, int speed)
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{
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struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, };
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if (data->disallow_fan_support)
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return -EINVAL;
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regs.ebx = (fan & 0xff) | (speed << 8);
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return i8k_smm(®s) ? : (regs.eax & 0xffff) * data->i8k_fan_mult;
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}
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/*
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* Enable or disable automatic BIOS fan control support
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*/
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static int i8k_enable_fan_auto_mode(const struct dell_smm_data *data, bool enable)
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{
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struct smm_regs regs = { };
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if (data->disallow_fan_support)
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return -EINVAL;
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regs.eax = enable ? data->auto_fan : data->manual_fan;
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return i8k_smm(®s);
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}
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/*
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* Set the fan speed (off, low, high). Returns the new fan status.
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*/
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static int i8k_set_fan(const struct dell_smm_data *data, int fan, int speed)
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{
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struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
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if (data->disallow_fan_support)
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return -EINVAL;
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speed = (speed < 0) ? 0 : ((speed > data->i8k_fan_max) ? data->i8k_fan_max : speed);
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regs.ebx = (fan & 0xff) | (speed << 8);
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return i8k_smm(®s) ? : i8k_get_fan_status(data, fan);
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}
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static int __init i8k_get_temp_type(int sensor)
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{
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struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, };
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regs.ebx = sensor & 0xff;
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return i8k_smm(®s) ? : regs.eax & 0xff;
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}
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/*
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* Read the cpu temperature.
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*/
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static int _i8k_get_temp(int sensor)
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{
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struct smm_regs regs = {
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.eax = I8K_SMM_GET_TEMP,
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.ebx = sensor & 0xff,
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};
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return i8k_smm(®s) ? : regs.eax & 0xff;
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}
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static int i8k_get_temp(int sensor)
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{
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int temp = _i8k_get_temp(sensor);
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/*
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* Sometimes the temperature sensor returns 0x99, which is out of range.
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* In this case we retry (once) before returning an error.
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# 1003655137 00000058 00005a4b
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# 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
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# 1003655139 00000054 00005c52
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*/
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if (temp == 0x99) {
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msleep(100);
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temp = _i8k_get_temp(sensor);
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}
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/*
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* Return -ENODATA for all invalid temperatures.
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*
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* Known instances are the 0x99 value as seen above as well as
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* 0xc1 (193), which may be returned when trying to read the GPU
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* temperature if the system supports a GPU and it is currently
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* turned off.
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*/
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if (temp > I8K_MAX_TEMP)
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return -ENODATA;
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return temp;
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}
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static int __init i8k_get_dell_signature(int req_fn)
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{
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struct smm_regs regs = { .eax = req_fn, };
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int rc;
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rc = i8k_smm(®s);
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if (rc < 0)
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return rc;
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return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
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}
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#if IS_ENABLED(CONFIG_I8K)
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/*
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* Read the Fn key status.
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*/
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static int i8k_get_fn_status(void)
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{
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struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
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int rc;
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rc = i8k_smm(®s);
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if (rc < 0)
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return rc;
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switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
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case I8K_FN_UP:
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return I8K_VOL_UP;
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case I8K_FN_DOWN:
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return I8K_VOL_DOWN;
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case I8K_FN_MUTE:
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return I8K_VOL_MUTE;
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default:
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return 0;
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}
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}
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/*
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* Read the power status.
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*/
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static int i8k_get_power_status(void)
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{
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struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
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int rc;
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rc = i8k_smm(®s);
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if (rc < 0)
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return rc;
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return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
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}
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/*
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* Procfs interface
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*/
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static int
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i8k_ioctl_unlocked(struct file *fp, struct dell_smm_data *data, unsigned int cmd, unsigned long arg)
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{
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int val = 0;
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int speed;
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unsigned char buff[16];
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int __user *argp = (int __user *)arg;
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if (!argp)
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return -EINVAL;
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switch (cmd) {
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case I8K_BIOS_VERSION:
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if (!isdigit(data->bios_version[0]) || !isdigit(data->bios_version[1]) ||
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!isdigit(data->bios_version[2]))
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return -EINVAL;
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val = (data->bios_version[0] << 16) |
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(data->bios_version[1] << 8) | data->bios_version[2];
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break;
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case I8K_MACHINE_ID:
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if (restricted && !capable(CAP_SYS_ADMIN))
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return -EPERM;
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memset(buff, 0, sizeof(buff));
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strscpy(buff, data->bios_machineid, sizeof(buff));
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break;
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case I8K_FN_STATUS:
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val = i8k_get_fn_status();
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break;
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case I8K_POWER_STATUS:
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val = i8k_get_power_status();
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break;
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case I8K_GET_TEMP:
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val = i8k_get_temp(0);
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break;
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case I8K_GET_SPEED:
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if (copy_from_user(&val, argp, sizeof(int)))
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return -EFAULT;
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|
|
val = i8k_get_fan_speed(data, val);
|
|
break;
|
|
|
|
case I8K_GET_FAN:
|
|
if (copy_from_user(&val, argp, sizeof(int)))
|
|
return -EFAULT;
|
|
|
|
val = i8k_get_fan_status(data, val);
|
|
break;
|
|
|
|
case I8K_SET_FAN:
|
|
if (restricted && !capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (copy_from_user(&val, argp, sizeof(int)))
|
|
return -EFAULT;
|
|
|
|
if (copy_from_user(&speed, argp + 1, sizeof(int)))
|
|
return -EFAULT;
|
|
|
|
val = i8k_set_fan(data, val, speed);
|
|
break;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (val < 0)
|
|
return val;
|
|
|
|
switch (cmd) {
|
|
case I8K_BIOS_VERSION:
|
|
if (copy_to_user(argp, &val, 4))
|
|
return -EFAULT;
|
|
|
|
break;
|
|
case I8K_MACHINE_ID:
|
|
if (copy_to_user(argp, buff, 16))
|
|
return -EFAULT;
|
|
|
|
break;
|
|
default:
|
|
if (copy_to_user(argp, &val, sizeof(int)))
|
|
return -EFAULT;
|
|
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct dell_smm_data *data = PDE_DATA(file_inode(fp));
|
|
long ret;
|
|
|
|
mutex_lock(&data->i8k_mutex);
|
|
ret = i8k_ioctl_unlocked(fp, data, cmd, arg);
|
|
mutex_unlock(&data->i8k_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Print the information for /proc/i8k.
|
|
*/
|
|
static int i8k_proc_show(struct seq_file *seq, void *offset)
|
|
{
|
|
struct dell_smm_data *data = seq->private;
|
|
int fn_key, cpu_temp, ac_power;
|
|
int left_fan, right_fan, left_speed, right_speed;
|
|
|
|
cpu_temp = i8k_get_temp(0); /* 11100 µs */
|
|
left_fan = i8k_get_fan_status(data, I8K_FAN_LEFT); /* 580 µs */
|
|
right_fan = i8k_get_fan_status(data, I8K_FAN_RIGHT); /* 580 µs */
|
|
left_speed = i8k_get_fan_speed(data, I8K_FAN_LEFT); /* 580 µs */
|
|
right_speed = i8k_get_fan_speed(data, I8K_FAN_RIGHT); /* 580 µs */
|
|
fn_key = i8k_get_fn_status(); /* 750 µs */
|
|
if (power_status)
|
|
ac_power = i8k_get_power_status(); /* 14700 µs */
|
|
else
|
|
ac_power = -1;
|
|
|
|
/*
|
|
* Info:
|
|
*
|
|
* 1) Format version (this will change if format changes)
|
|
* 2) BIOS version
|
|
* 3) BIOS machine ID
|
|
* 4) Cpu temperature
|
|
* 5) Left fan status
|
|
* 6) Right fan status
|
|
* 7) Left fan speed
|
|
* 8) Right fan speed
|
|
* 9) AC power
|
|
* 10) Fn Key status
|
|
*/
|
|
seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
|
|
I8K_PROC_FMT,
|
|
data->bios_version,
|
|
(restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : data->bios_machineid,
|
|
cpu_temp,
|
|
left_fan, right_fan, left_speed, right_speed,
|
|
ac_power, fn_key);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int i8k_open_fs(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, i8k_proc_show, PDE_DATA(inode));
|
|
}
|
|
|
|
static const struct proc_ops i8k_proc_ops = {
|
|
.proc_open = i8k_open_fs,
|
|
.proc_read = seq_read,
|
|
.proc_lseek = seq_lseek,
|
|
.proc_release = single_release,
|
|
.proc_ioctl = i8k_ioctl,
|
|
};
|
|
|
|
static void i8k_exit_procfs(void *param)
|
|
{
|
|
remove_proc_entry("i8k", NULL);
|
|
}
|
|
|
|
static void __init i8k_init_procfs(struct device *dev)
|
|
{
|
|
struct dell_smm_data *data = dev_get_drvdata(dev);
|
|
|
|
/* Only register exit function if creation was successful */
|
|
if (proc_create_data("i8k", 0, NULL, &i8k_proc_ops, data))
|
|
devm_add_action_or_reset(dev, i8k_exit_procfs, NULL);
|
|
}
|
|
|
|
#else
|
|
|
|
static void __init i8k_init_procfs(struct device *dev)
|
|
{
|
|
}
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Hwmon interface
|
|
*/
|
|
|
|
static umode_t dell_smm_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr,
|
|
int channel)
|
|
{
|
|
const struct dell_smm_data *data = drvdata;
|
|
|
|
switch (type) {
|
|
case hwmon_temp:
|
|
switch (attr) {
|
|
case hwmon_temp_input:
|
|
case hwmon_temp_label:
|
|
if (data->temp_type[channel] >= 0)
|
|
return 0444;
|
|
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
case hwmon_fan:
|
|
if (data->disallow_fan_support)
|
|
break;
|
|
|
|
switch (attr) {
|
|
case hwmon_fan_input:
|
|
if (data->fan[channel])
|
|
return 0444;
|
|
|
|
break;
|
|
case hwmon_fan_label:
|
|
if (data->fan[channel] && !data->disallow_fan_type_call)
|
|
return 0444;
|
|
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
case hwmon_pwm:
|
|
if (data->disallow_fan_support)
|
|
break;
|
|
|
|
switch (attr) {
|
|
case hwmon_pwm_input:
|
|
if (data->fan[channel])
|
|
return 0644;
|
|
|
|
break;
|
|
case hwmon_pwm_enable:
|
|
if (data->auto_fan)
|
|
/*
|
|
* There is no command for retrieve the current status
|
|
* from BIOS, and userspace/firmware itself can change
|
|
* it.
|
|
* Thus we can only provide write-only access for now.
|
|
*/
|
|
return 0200;
|
|
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dell_smm_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
|
|
long *val)
|
|
{
|
|
struct dell_smm_data *data = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
switch (type) {
|
|
case hwmon_temp:
|
|
switch (attr) {
|
|
case hwmon_temp_input:
|
|
ret = i8k_get_temp(channel);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
*val = ret * 1000;
|
|
|
|
return 0;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
case hwmon_fan:
|
|
switch (attr) {
|
|
case hwmon_fan_input:
|
|
ret = i8k_get_fan_speed(data, channel);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
*val = ret;
|
|
|
|
return 0;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
case hwmon_pwm:
|
|
switch (attr) {
|
|
case hwmon_pwm_input:
|
|
ret = i8k_get_fan_status(data, channel);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
*val = clamp_val(ret * data->i8k_pwm_mult, 0, 255);
|
|
|
|
return 0;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static const char *dell_smm_fan_label(struct dell_smm_data *data, int channel)
|
|
{
|
|
bool dock = false;
|
|
int type = i8k_get_fan_type(data, channel);
|
|
|
|
if (type < 0)
|
|
return ERR_PTR(type);
|
|
|
|
if (type & 0x10) {
|
|
dock = true;
|
|
type &= 0x0F;
|
|
}
|
|
|
|
if (type >= ARRAY_SIZE(fan_labels))
|
|
type = ARRAY_SIZE(fan_labels) - 1;
|
|
|
|
return dock ? docking_labels[type] : fan_labels[type];
|
|
}
|
|
|
|
static int dell_smm_read_string(struct device *dev, enum hwmon_sensor_types type, u32 attr,
|
|
int channel, const char **str)
|
|
{
|
|
struct dell_smm_data *data = dev_get_drvdata(dev);
|
|
|
|
switch (type) {
|
|
case hwmon_temp:
|
|
switch (attr) {
|
|
case hwmon_temp_label:
|
|
*str = temp_labels[data->temp_type[channel]];
|
|
return 0;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
case hwmon_fan:
|
|
switch (attr) {
|
|
case hwmon_fan_label:
|
|
*str = dell_smm_fan_label(data, channel);
|
|
return PTR_ERR_OR_ZERO(*str);
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static int dell_smm_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
|
|
long val)
|
|
{
|
|
struct dell_smm_data *data = dev_get_drvdata(dev);
|
|
unsigned long pwm;
|
|
bool enable;
|
|
int err;
|
|
|
|
switch (type) {
|
|
case hwmon_pwm:
|
|
switch (attr) {
|
|
case hwmon_pwm_input:
|
|
pwm = clamp_val(DIV_ROUND_CLOSEST(val, data->i8k_pwm_mult), 0,
|
|
data->i8k_fan_max);
|
|
|
|
mutex_lock(&data->i8k_mutex);
|
|
err = i8k_set_fan(data, channel, pwm);
|
|
mutex_unlock(&data->i8k_mutex);
|
|
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return 0;
|
|
case hwmon_pwm_enable:
|
|
if (!val)
|
|
return -EINVAL;
|
|
|
|
if (val == 1)
|
|
enable = false;
|
|
else
|
|
enable = true;
|
|
|
|
mutex_lock(&data->i8k_mutex);
|
|
err = i8k_enable_fan_auto_mode(data, enable);
|
|
mutex_unlock(&data->i8k_mutex);
|
|
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return 0;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static const struct hwmon_ops dell_smm_ops = {
|
|
.is_visible = dell_smm_is_visible,
|
|
.read = dell_smm_read,
|
|
.read_string = dell_smm_read_string,
|
|
.write = dell_smm_write,
|
|
};
|
|
|
|
static const struct hwmon_channel_info *dell_smm_info[] = {
|
|
HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
|
|
HWMON_CHANNEL_INFO(temp,
|
|
HWMON_T_INPUT | HWMON_T_LABEL,
|
|
HWMON_T_INPUT | HWMON_T_LABEL,
|
|
HWMON_T_INPUT | HWMON_T_LABEL,
|
|
HWMON_T_INPUT | HWMON_T_LABEL,
|
|
HWMON_T_INPUT | HWMON_T_LABEL,
|
|
HWMON_T_INPUT | HWMON_T_LABEL,
|
|
HWMON_T_INPUT | HWMON_T_LABEL,
|
|
HWMON_T_INPUT | HWMON_T_LABEL,
|
|
HWMON_T_INPUT | HWMON_T_LABEL,
|
|
HWMON_T_INPUT | HWMON_T_LABEL
|
|
),
|
|
HWMON_CHANNEL_INFO(fan,
|
|
HWMON_F_INPUT | HWMON_F_LABEL,
|
|
HWMON_F_INPUT | HWMON_F_LABEL,
|
|
HWMON_F_INPUT | HWMON_F_LABEL
|
|
),
|
|
HWMON_CHANNEL_INFO(pwm,
|
|
HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
|
|
HWMON_PWM_INPUT,
|
|
HWMON_PWM_INPUT
|
|
),
|
|
NULL
|
|
};
|
|
|
|
static const struct hwmon_chip_info dell_smm_chip_info = {
|
|
.ops = &dell_smm_ops,
|
|
.info = dell_smm_info,
|
|
};
|
|
|
|
static int __init dell_smm_init_hwmon(struct device *dev)
|
|
{
|
|
struct dell_smm_data *data = dev_get_drvdata(dev);
|
|
struct device *dell_smm_hwmon_dev;
|
|
int i, err;
|
|
|
|
for (i = 0; i < DELL_SMM_NO_TEMP; i++) {
|
|
data->temp_type[i] = i8k_get_temp_type(i);
|
|
if (data->temp_type[i] < 0)
|
|
continue;
|
|
|
|
if (data->temp_type[i] >= ARRAY_SIZE(temp_labels))
|
|
data->temp_type[i] = ARRAY_SIZE(temp_labels) - 1;
|
|
}
|
|
|
|
for (i = 0; i < DELL_SMM_NO_FANS; i++) {
|
|
data->fan_type[i] = INT_MIN;
|
|
err = i8k_get_fan_status(data, i);
|
|
if (err < 0)
|
|
err = i8k_get_fan_type(data, i);
|
|
if (err >= 0)
|
|
data->fan[i] = true;
|
|
}
|
|
|
|
dell_smm_hwmon_dev = devm_hwmon_device_register_with_info(dev, "dell_smm", data,
|
|
&dell_smm_chip_info, NULL);
|
|
|
|
return PTR_ERR_OR_ZERO(dell_smm_hwmon_dev);
|
|
}
|
|
|
|
struct i8k_config_data {
|
|
uint fan_mult;
|
|
uint fan_max;
|
|
};
|
|
|
|
enum i8k_configs {
|
|
DELL_LATITUDE_D520,
|
|
DELL_PRECISION_490,
|
|
DELL_STUDIO,
|
|
DELL_XPS,
|
|
};
|
|
|
|
static const struct i8k_config_data i8k_config_data[] __initconst = {
|
|
[DELL_LATITUDE_D520] = {
|
|
.fan_mult = 1,
|
|
.fan_max = I8K_FAN_TURBO,
|
|
},
|
|
[DELL_PRECISION_490] = {
|
|
.fan_mult = 1,
|
|
.fan_max = I8K_FAN_TURBO,
|
|
},
|
|
[DELL_STUDIO] = {
|
|
.fan_mult = 1,
|
|
.fan_max = I8K_FAN_HIGH,
|
|
},
|
|
[DELL_XPS] = {
|
|
.fan_mult = 1,
|
|
.fan_max = I8K_FAN_HIGH,
|
|
},
|
|
};
|
|
|
|
static const struct dmi_system_id i8k_dmi_table[] __initconst = {
|
|
{
|
|
.ident = "Dell Inspiron",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
|
|
},
|
|
},
|
|
{
|
|
.ident = "Dell Latitude",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
|
|
},
|
|
},
|
|
{
|
|
.ident = "Dell Inspiron 2",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
|
|
},
|
|
},
|
|
{
|
|
.ident = "Dell Latitude D520",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"),
|
|
},
|
|
.driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520],
|
|
},
|
|
{
|
|
.ident = "Dell Latitude 2",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
|
|
},
|
|
},
|
|
{ /* UK Inspiron 6400 */
|
|
.ident = "Dell Inspiron 3",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "MM061"),
|
|
},
|
|
},
|
|
{
|
|
.ident = "Dell Inspiron 3",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
|
|
},
|
|
},
|
|
{
|
|
.ident = "Dell Precision 490",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME,
|
|
"Precision WorkStation 490"),
|
|
},
|
|
.driver_data = (void *)&i8k_config_data[DELL_PRECISION_490],
|
|
},
|
|
{
|
|
.ident = "Dell Precision",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Precision"),
|
|
},
|
|
},
|
|
{
|
|
.ident = "Dell Vostro",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"),
|
|
},
|
|
},
|
|
{
|
|
.ident = "Dell Studio",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Studio"),
|
|
},
|
|
.driver_data = (void *)&i8k_config_data[DELL_STUDIO],
|
|
},
|
|
{
|
|
.ident = "Dell XPS M140",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"),
|
|
},
|
|
.driver_data = (void *)&i8k_config_data[DELL_XPS],
|
|
},
|
|
{
|
|
.ident = "Dell XPS",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "XPS"),
|
|
},
|
|
},
|
|
{ }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(dmi, i8k_dmi_table);
|
|
|
|
/*
|
|
* On some machines once I8K_SMM_GET_FAN_TYPE is issued then CPU fan speed
|
|
* randomly going up and down due to bug in Dell SMM or BIOS. Here is blacklist
|
|
* of affected Dell machines for which we disallow I8K_SMM_GET_FAN_TYPE call.
|
|
* See bug: https://bugzilla.kernel.org/show_bug.cgi?id=100121
|
|
*/
|
|
static const struct dmi_system_id i8k_blacklist_fan_type_dmi_table[] __initconst = {
|
|
{
|
|
.ident = "Dell Studio XPS 8000",
|
|
.matches = {
|
|
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8000"),
|
|
},
|
|
},
|
|
{
|
|
.ident = "Dell Studio XPS 8100",
|
|
.matches = {
|
|
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8100"),
|
|
},
|
|
},
|
|
{
|
|
.ident = "Dell Inspiron 580",
|
|
.matches = {
|
|
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 580 "),
|
|
},
|
|
},
|
|
{ }
|
|
};
|
|
|
|
/*
|
|
* On some machines all fan related SMM functions implemented by Dell BIOS
|
|
* firmware freeze kernel for about 500ms. Until Dell fixes these problems fan
|
|
* support for affected blacklisted Dell machines stay disabled.
|
|
* See bug: https://bugzilla.kernel.org/show_bug.cgi?id=195751
|
|
*/
|
|
static const struct dmi_system_id i8k_blacklist_fan_support_dmi_table[] __initconst = {
|
|
{
|
|
.ident = "Dell Inspiron 7720",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
|
|
},
|
|
},
|
|
{
|
|
.ident = "Dell Vostro 3360",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
|
|
},
|
|
},
|
|
{
|
|
.ident = "Dell XPS13 9333",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"),
|
|
},
|
|
},
|
|
{
|
|
.ident = "Dell XPS 15 L502X",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L502X"),
|
|
},
|
|
},
|
|
{ }
|
|
};
|
|
|
|
struct i8k_fan_control_data {
|
|
unsigned int manual_fan;
|
|
unsigned int auto_fan;
|
|
};
|
|
|
|
enum i8k_fan_controls {
|
|
I8K_FAN_34A3_35A3,
|
|
};
|
|
|
|
static const struct i8k_fan_control_data i8k_fan_control_data[] __initconst = {
|
|
[I8K_FAN_34A3_35A3] = {
|
|
.manual_fan = 0x34a3,
|
|
.auto_fan = 0x35a3,
|
|
},
|
|
};
|
|
|
|
static const struct dmi_system_id i8k_whitelist_fan_control[] __initconst = {
|
|
{
|
|
.ident = "Dell Latitude 5480",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude 5480"),
|
|
},
|
|
.driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3],
|
|
},
|
|
{
|
|
.ident = "Dell Latitude E6440",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude E6440"),
|
|
},
|
|
.driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3],
|
|
},
|
|
{
|
|
.ident = "Dell Latitude E7440",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude E7440"),
|
|
},
|
|
.driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3],
|
|
},
|
|
{
|
|
.ident = "Dell Precision 5530",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Precision 5530"),
|
|
},
|
|
.driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3],
|
|
},
|
|
{
|
|
.ident = "Dell Precision 7510",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
|
|
},
|
|
.driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3],
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static int __init dell_smm_probe(struct platform_device *pdev)
|
|
{
|
|
struct dell_smm_data *data;
|
|
const struct dmi_system_id *id, *fan_control;
|
|
int fan, ret;
|
|
|
|
data = devm_kzalloc(&pdev->dev, sizeof(struct dell_smm_data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
mutex_init(&data->i8k_mutex);
|
|
data->i8k_fan_mult = I8K_FAN_MULT;
|
|
data->i8k_fan_max = I8K_FAN_HIGH;
|
|
platform_set_drvdata(pdev, data);
|
|
|
|
if (dmi_check_system(i8k_blacklist_fan_support_dmi_table)) {
|
|
dev_warn(&pdev->dev, "broken Dell BIOS detected, disallow fan support\n");
|
|
if (!force)
|
|
data->disallow_fan_support = true;
|
|
}
|
|
|
|
if (dmi_check_system(i8k_blacklist_fan_type_dmi_table)) {
|
|
dev_warn(&pdev->dev, "broken Dell BIOS detected, disallow fan type call\n");
|
|
if (!force)
|
|
data->disallow_fan_type_call = true;
|
|
}
|
|
|
|
strscpy(data->bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
|
|
sizeof(data->bios_version));
|
|
strscpy(data->bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
|
|
sizeof(data->bios_machineid));
|
|
|
|
/*
|
|
* Set fan multiplier and maximal fan speed from dmi config
|
|
* Values specified in module parameters override values from dmi
|
|
*/
|
|
id = dmi_first_match(i8k_dmi_table);
|
|
if (id && id->driver_data) {
|
|
const struct i8k_config_data *conf = id->driver_data;
|
|
|
|
if (!fan_mult && conf->fan_mult)
|
|
fan_mult = conf->fan_mult;
|
|
|
|
if (!fan_max && conf->fan_max)
|
|
fan_max = conf->fan_max;
|
|
}
|
|
|
|
data->i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */
|
|
data->i8k_pwm_mult = DIV_ROUND_UP(255, data->i8k_fan_max);
|
|
|
|
fan_control = dmi_first_match(i8k_whitelist_fan_control);
|
|
if (fan_control && fan_control->driver_data) {
|
|
const struct i8k_fan_control_data *control = fan_control->driver_data;
|
|
|
|
data->manual_fan = control->manual_fan;
|
|
data->auto_fan = control->auto_fan;
|
|
dev_info(&pdev->dev, "enabling support for setting automatic/manual fan control\n");
|
|
}
|
|
|
|
if (!fan_mult) {
|
|
/*
|
|
* Autodetect fan multiplier based on nominal rpm
|
|
* If fan reports rpm value too high then set multiplier to 1
|
|
*/
|
|
for (fan = 0; fan < DELL_SMM_NO_FANS; ++fan) {
|
|
ret = i8k_get_fan_nominal_speed(data, fan, data->i8k_fan_max);
|
|
if (ret < 0)
|
|
continue;
|
|
|
|
if (ret > I8K_FAN_MAX_RPM)
|
|
data->i8k_fan_mult = 1;
|
|
break;
|
|
}
|
|
} else {
|
|
/* Fan multiplier was specified in module param or in dmi */
|
|
data->i8k_fan_mult = fan_mult;
|
|
}
|
|
|
|
ret = dell_smm_init_hwmon(&pdev->dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
i8k_init_procfs(&pdev->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver dell_smm_driver = {
|
|
.driver = {
|
|
.name = KBUILD_MODNAME,
|
|
},
|
|
};
|
|
|
|
static struct platform_device *dell_smm_device;
|
|
|
|
/*
|
|
* Probe for the presence of a supported laptop.
|
|
*/
|
|
static int __init i8k_init(void)
|
|
{
|
|
/*
|
|
* Get DMI information
|
|
*/
|
|
if (!dmi_check_system(i8k_dmi_table)) {
|
|
if (!ignore_dmi && !force)
|
|
return -ENODEV;
|
|
|
|
pr_info("not running on a supported Dell system.\n");
|
|
pr_info("vendor=%s, model=%s, version=%s\n",
|
|
i8k_get_dmi_data(DMI_SYS_VENDOR),
|
|
i8k_get_dmi_data(DMI_PRODUCT_NAME),
|
|
i8k_get_dmi_data(DMI_BIOS_VERSION));
|
|
}
|
|
|
|
/*
|
|
* Get SMM Dell signature
|
|
*/
|
|
if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
|
|
i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
|
|
pr_err("unable to get SMM Dell signature\n");
|
|
if (!force)
|
|
return -ENODEV;
|
|
}
|
|
|
|
dell_smm_device = platform_create_bundle(&dell_smm_driver, dell_smm_probe, NULL, 0, NULL,
|
|
0);
|
|
|
|
return PTR_ERR_OR_ZERO(dell_smm_device);
|
|
}
|
|
|
|
static void __exit i8k_exit(void)
|
|
{
|
|
platform_device_unregister(dell_smm_device);
|
|
platform_driver_unregister(&dell_smm_driver);
|
|
}
|
|
|
|
module_init(i8k_init);
|
|
module_exit(i8k_exit);
|