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1334 lines
32 KiB
1334 lines
32 KiB
// 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 <[email protected]> |
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* |
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* Hwmon integration: |
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* Copyright (C) 2011 Jean Delvare <[email protected]> |
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* Copyright (C) 2013, 2014 Guenter Roeck <[email protected]> |
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* Copyright (C) 2014, 2015 Pali Rohár <[email protected]> |
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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/module.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/hwmon-sysfs.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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static DEFINE_MUTEX(i8k_mutex); |
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static char bios_version[4]; |
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static char bios_machineid[16]; |
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static struct device *i8k_hwmon_dev; |
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static u32 i8k_hwmon_flags; |
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static uint i8k_fan_mult = I8K_FAN_MULT; |
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static uint i8k_pwm_mult; |
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static uint i8k_fan_max = I8K_FAN_HIGH; |
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static bool disallow_fan_type_call; |
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static bool disallow_fan_support; |
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static unsigned int manual_fan; |
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static unsigned int auto_fan; |
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#define I8K_HWMON_HAVE_TEMP1 (1 << 0) |
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#define I8K_HWMON_HAVE_TEMP2 (1 << 1) |
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#define I8K_HWMON_HAVE_TEMP3 (1 << 2) |
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#define I8K_HWMON_HAVE_TEMP4 (1 << 3) |
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#define I8K_HWMON_HAVE_TEMP5 (1 << 4) |
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#define I8K_HWMON_HAVE_TEMP6 (1 << 5) |
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#define I8K_HWMON_HAVE_TEMP7 (1 << 6) |
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#define I8K_HWMON_HAVE_TEMP8 (1 << 7) |
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#define I8K_HWMON_HAVE_TEMP9 (1 << 8) |
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#define I8K_HWMON_HAVE_TEMP10 (1 << 9) |
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#define I8K_HWMON_HAVE_FAN1 (1 << 10) |
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#define I8K_HWMON_HAVE_FAN2 (1 << 11) |
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#define I8K_HWMON_HAVE_FAN3 (1 << 12) |
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MODULE_AUTHOR("Massimo Dal Zotto ([email protected])"); |
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MODULE_AUTHOR("Pali Rohár <[email protected]>"); |
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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 inline const char *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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int rc; |
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struct smm_regs *regs = par; |
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int eax = regs->eax; |
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#ifdef DEBUG |
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int ebx = regs->ebx; |
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unsigned long duration; |
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ktime_t calltime, delta, rettime; |
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calltime = ktime_get(); |
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#endif |
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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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#ifdef DEBUG |
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rettime = ktime_get(); |
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delta = ktime_sub(rettime, calltime); |
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duration = ktime_to_ns(delta) >> 10; |
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pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x (took %7lu usecs)\n", eax, ebx, |
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(rc ? 0xffff : regs->eax & 0xffff), duration); |
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#endif |
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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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get_online_cpus(); |
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ret = smp_call_on_cpu(0, i8k_smm_func, regs, true); |
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put_online_cpus(); |
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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(int fan) |
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{ |
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struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, }; |
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if (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(int fan) |
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{ |
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struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, }; |
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if (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) * 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(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 (disallow_fan_support || 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(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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static int types[3] = { INT_MIN, INT_MIN, INT_MIN }; |
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if (types[fan] == INT_MIN) |
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types[fan] = _i8k_get_fan_type(fan); |
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return types[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 i8k_get_fan_nominal_speed(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 (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) * 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(bool enable) |
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{ |
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struct smm_regs regs = { }; |
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if (disallow_fan_support) |
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return -EINVAL; |
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regs.eax = enable ? auto_fan : 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(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 (disallow_fan_support) |
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return -EINVAL; |
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speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? 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(fan); |
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} |
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static int 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 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, 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(bios_version[0]) || !isdigit(bios_version[1]) || |
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!isdigit(bios_version[2])) |
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return -EINVAL; |
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val = (bios_version[0] << 16) | |
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(bios_version[1] << 8) | 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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strlcpy(buff, 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(val); |
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break; |
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case I8K_GET_FAN: |
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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_status(val); |
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break; |
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case I8K_SET_FAN: |
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if (restricted && !capable(CAP_SYS_ADMIN)) |
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return -EPERM; |
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if (copy_from_user(&val, argp, sizeof(int))) |
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return -EFAULT; |
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if (copy_from_user(&speed, argp + 1, sizeof(int))) |
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return -EFAULT; |
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val = i8k_set_fan(val, speed); |
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break; |
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default: |
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return -EINVAL; |
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} |
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if (val < 0) |
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return val; |
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switch (cmd) { |
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case I8K_BIOS_VERSION: |
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if (copy_to_user(argp, &val, 4)) |
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return -EFAULT; |
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break; |
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case I8K_MACHINE_ID: |
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if (copy_to_user(argp, buff, 16)) |
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return -EFAULT; |
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break; |
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default: |
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if (copy_to_user(argp, &val, sizeof(int))) |
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return -EFAULT; |
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break; |
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} |
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return 0; |
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} |
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static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) |
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{ |
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long ret; |
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mutex_lock(&i8k_mutex); |
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ret = i8k_ioctl_unlocked(fp, cmd, arg); |
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mutex_unlock(&i8k_mutex); |
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return ret; |
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} |
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/* |
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* Print the information for /proc/i8k. |
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*/ |
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static int i8k_proc_show(struct seq_file *seq, void *offset) |
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{ |
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int fn_key, cpu_temp, ac_power; |
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int left_fan, right_fan, left_speed, right_speed; |
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cpu_temp = i8k_get_temp(0); /* 11100 µs */ |
|
left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */ |
|
right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */ |
|
left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */ |
|
right_speed = i8k_get_fan_speed(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, |
|
bios_version, |
|
(restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : 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, NULL); |
|
} |
|
|
|
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 __init i8k_init_procfs(void) |
|
{ |
|
/* Register the proc entry */ |
|
proc_create("i8k", 0, NULL, &i8k_proc_ops); |
|
} |
|
|
|
static void __exit i8k_exit_procfs(void) |
|
{ |
|
remove_proc_entry("i8k", NULL); |
|
} |
|
|
|
#else |
|
|
|
static inline void __init i8k_init_procfs(void) |
|
{ |
|
} |
|
|
|
static inline void __exit i8k_exit_procfs(void) |
|
{ |
|
} |
|
|
|
#endif |
|
|
|
/* |
|
* Hwmon interface |
|
*/ |
|
|
|
static ssize_t i8k_hwmon_temp_label_show(struct device *dev, |
|
struct device_attribute *devattr, |
|
char *buf) |
|
{ |
|
static const char * const labels[] = { |
|
"CPU", |
|
"GPU", |
|
"SODIMM", |
|
"Other", |
|
"Ambient", |
|
"Other", |
|
}; |
|
int index = to_sensor_dev_attr(devattr)->index; |
|
int type; |
|
|
|
type = i8k_get_temp_type(index); |
|
if (type < 0) |
|
return type; |
|
if (type >= ARRAY_SIZE(labels)) |
|
type = ARRAY_SIZE(labels) - 1; |
|
return sprintf(buf, "%s\n", labels[type]); |
|
} |
|
|
|
static ssize_t i8k_hwmon_temp_show(struct device *dev, |
|
struct device_attribute *devattr, |
|
char *buf) |
|
{ |
|
int index = to_sensor_dev_attr(devattr)->index; |
|
int temp; |
|
|
|
temp = i8k_get_temp(index); |
|
if (temp < 0) |
|
return temp; |
|
return sprintf(buf, "%d\n", temp * 1000); |
|
} |
|
|
|
static ssize_t i8k_hwmon_fan_label_show(struct device *dev, |
|
struct device_attribute *devattr, |
|
char *buf) |
|
{ |
|
static const char * const labels[] = { |
|
"Processor Fan", |
|
"Motherboard Fan", |
|
"Video Fan", |
|
"Power Supply Fan", |
|
"Chipset Fan", |
|
"Other Fan", |
|
}; |
|
int index = to_sensor_dev_attr(devattr)->index; |
|
bool dock = false; |
|
int type; |
|
|
|
type = i8k_get_fan_type(index); |
|
if (type < 0) |
|
return type; |
|
|
|
if (type & 0x10) { |
|
dock = true; |
|
type &= 0x0F; |
|
} |
|
|
|
if (type >= ARRAY_SIZE(labels)) |
|
type = (ARRAY_SIZE(labels) - 1); |
|
|
|
return sprintf(buf, "%s%s\n", (dock ? "Docking " : ""), labels[type]); |
|
} |
|
|
|
static ssize_t i8k_hwmon_fan_show(struct device *dev, |
|
struct device_attribute *devattr, char *buf) |
|
{ |
|
int index = to_sensor_dev_attr(devattr)->index; |
|
int fan_speed; |
|
|
|
fan_speed = i8k_get_fan_speed(index); |
|
if (fan_speed < 0) |
|
return fan_speed; |
|
return sprintf(buf, "%d\n", fan_speed); |
|
} |
|
|
|
static ssize_t i8k_hwmon_pwm_show(struct device *dev, |
|
struct device_attribute *devattr, char *buf) |
|
{ |
|
int index = to_sensor_dev_attr(devattr)->index; |
|
int status; |
|
|
|
status = i8k_get_fan_status(index); |
|
if (status < 0) |
|
return -EIO; |
|
return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255)); |
|
} |
|
|
|
static ssize_t i8k_hwmon_pwm_store(struct device *dev, |
|
struct device_attribute *attr, |
|
const char *buf, size_t count) |
|
{ |
|
int index = to_sensor_dev_attr(attr)->index; |
|
unsigned long val; |
|
int err; |
|
|
|
err = kstrtoul(buf, 10, &val); |
|
if (err) |
|
return err; |
|
val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max); |
|
|
|
mutex_lock(&i8k_mutex); |
|
err = i8k_set_fan(index, val); |
|
mutex_unlock(&i8k_mutex); |
|
|
|
return err < 0 ? -EIO : count; |
|
} |
|
|
|
static ssize_t i8k_hwmon_pwm_enable_store(struct device *dev, |
|
struct device_attribute *attr, |
|
const char *buf, size_t count) |
|
{ |
|
int err; |
|
bool enable; |
|
unsigned long val; |
|
|
|
if (!auto_fan) |
|
return -ENODEV; |
|
|
|
err = kstrtoul(buf, 10, &val); |
|
if (err) |
|
return err; |
|
|
|
if (val == 1) |
|
enable = false; |
|
else if (val == 2) |
|
enable = true; |
|
else |
|
return -EINVAL; |
|
|
|
mutex_lock(&i8k_mutex); |
|
err = i8k_enable_fan_auto_mode(enable); |
|
mutex_unlock(&i8k_mutex); |
|
|
|
return err ? err : count; |
|
} |
|
|
|
static SENSOR_DEVICE_ATTR_RO(temp1_input, i8k_hwmon_temp, 0); |
|
static SENSOR_DEVICE_ATTR_RO(temp1_label, i8k_hwmon_temp_label, 0); |
|
static SENSOR_DEVICE_ATTR_RO(temp2_input, i8k_hwmon_temp, 1); |
|
static SENSOR_DEVICE_ATTR_RO(temp2_label, i8k_hwmon_temp_label, 1); |
|
static SENSOR_DEVICE_ATTR_RO(temp3_input, i8k_hwmon_temp, 2); |
|
static SENSOR_DEVICE_ATTR_RO(temp3_label, i8k_hwmon_temp_label, 2); |
|
static SENSOR_DEVICE_ATTR_RO(temp4_input, i8k_hwmon_temp, 3); |
|
static SENSOR_DEVICE_ATTR_RO(temp4_label, i8k_hwmon_temp_label, 3); |
|
static SENSOR_DEVICE_ATTR_RO(temp5_input, i8k_hwmon_temp, 4); |
|
static SENSOR_DEVICE_ATTR_RO(temp5_label, i8k_hwmon_temp_label, 4); |
|
static SENSOR_DEVICE_ATTR_RO(temp6_input, i8k_hwmon_temp, 5); |
|
static SENSOR_DEVICE_ATTR_RO(temp6_label, i8k_hwmon_temp_label, 5); |
|
static SENSOR_DEVICE_ATTR_RO(temp7_input, i8k_hwmon_temp, 6); |
|
static SENSOR_DEVICE_ATTR_RO(temp7_label, i8k_hwmon_temp_label, 6); |
|
static SENSOR_DEVICE_ATTR_RO(temp8_input, i8k_hwmon_temp, 7); |
|
static SENSOR_DEVICE_ATTR_RO(temp8_label, i8k_hwmon_temp_label, 7); |
|
static SENSOR_DEVICE_ATTR_RO(temp9_input, i8k_hwmon_temp, 8); |
|
static SENSOR_DEVICE_ATTR_RO(temp9_label, i8k_hwmon_temp_label, 8); |
|
static SENSOR_DEVICE_ATTR_RO(temp10_input, i8k_hwmon_temp, 9); |
|
static SENSOR_DEVICE_ATTR_RO(temp10_label, i8k_hwmon_temp_label, 9); |
|
static SENSOR_DEVICE_ATTR_RO(fan1_input, i8k_hwmon_fan, 0); |
|
static SENSOR_DEVICE_ATTR_RO(fan1_label, i8k_hwmon_fan_label, 0); |
|
static SENSOR_DEVICE_ATTR_RW(pwm1, i8k_hwmon_pwm, 0); |
|
static SENSOR_DEVICE_ATTR_WO(pwm1_enable, i8k_hwmon_pwm_enable, 0); |
|
static SENSOR_DEVICE_ATTR_RO(fan2_input, i8k_hwmon_fan, 1); |
|
static SENSOR_DEVICE_ATTR_RO(fan2_label, i8k_hwmon_fan_label, 1); |
|
static SENSOR_DEVICE_ATTR_RW(pwm2, i8k_hwmon_pwm, 1); |
|
static SENSOR_DEVICE_ATTR_RO(fan3_input, i8k_hwmon_fan, 2); |
|
static SENSOR_DEVICE_ATTR_RO(fan3_label, i8k_hwmon_fan_label, 2); |
|
static SENSOR_DEVICE_ATTR_RW(pwm3, i8k_hwmon_pwm, 2); |
|
|
|
static struct attribute *i8k_attrs[] = { |
|
&sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */ |
|
&sensor_dev_attr_temp1_label.dev_attr.attr, /* 1 */ |
|
&sensor_dev_attr_temp2_input.dev_attr.attr, /* 2 */ |
|
&sensor_dev_attr_temp2_label.dev_attr.attr, /* 3 */ |
|
&sensor_dev_attr_temp3_input.dev_attr.attr, /* 4 */ |
|
&sensor_dev_attr_temp3_label.dev_attr.attr, /* 5 */ |
|
&sensor_dev_attr_temp4_input.dev_attr.attr, /* 6 */ |
|
&sensor_dev_attr_temp4_label.dev_attr.attr, /* 7 */ |
|
&sensor_dev_attr_temp5_input.dev_attr.attr, /* 8 */ |
|
&sensor_dev_attr_temp5_label.dev_attr.attr, /* 9 */ |
|
&sensor_dev_attr_temp6_input.dev_attr.attr, /* 10 */ |
|
&sensor_dev_attr_temp6_label.dev_attr.attr, /* 11 */ |
|
&sensor_dev_attr_temp7_input.dev_attr.attr, /* 12 */ |
|
&sensor_dev_attr_temp7_label.dev_attr.attr, /* 13 */ |
|
&sensor_dev_attr_temp8_input.dev_attr.attr, /* 14 */ |
|
&sensor_dev_attr_temp8_label.dev_attr.attr, /* 15 */ |
|
&sensor_dev_attr_temp9_input.dev_attr.attr, /* 16 */ |
|
&sensor_dev_attr_temp9_label.dev_attr.attr, /* 17 */ |
|
&sensor_dev_attr_temp10_input.dev_attr.attr, /* 18 */ |
|
&sensor_dev_attr_temp10_label.dev_attr.attr, /* 19 */ |
|
&sensor_dev_attr_fan1_input.dev_attr.attr, /* 20 */ |
|
&sensor_dev_attr_fan1_label.dev_attr.attr, /* 21 */ |
|
&sensor_dev_attr_pwm1.dev_attr.attr, /* 22 */ |
|
&sensor_dev_attr_pwm1_enable.dev_attr.attr, /* 23 */ |
|
&sensor_dev_attr_fan2_input.dev_attr.attr, /* 24 */ |
|
&sensor_dev_attr_fan2_label.dev_attr.attr, /* 25 */ |
|
&sensor_dev_attr_pwm2.dev_attr.attr, /* 26 */ |
|
&sensor_dev_attr_fan3_input.dev_attr.attr, /* 27 */ |
|
&sensor_dev_attr_fan3_label.dev_attr.attr, /* 28 */ |
|
&sensor_dev_attr_pwm3.dev_attr.attr, /* 29 */ |
|
NULL |
|
}; |
|
|
|
static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr, |
|
int index) |
|
{ |
|
if (disallow_fan_support && index >= 8) |
|
return 0; |
|
if (disallow_fan_type_call && |
|
(index == 9 || index == 12 || index == 15)) |
|
return 0; |
|
if (index >= 0 && index <= 1 && |
|
!(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1)) |
|
return 0; |
|
if (index >= 2 && index <= 3 && |
|
!(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2)) |
|
return 0; |
|
if (index >= 4 && index <= 5 && |
|
!(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3)) |
|
return 0; |
|
if (index >= 6 && index <= 7 && |
|
!(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4)) |
|
return 0; |
|
if (index >= 8 && index <= 9 && |
|
!(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP5)) |
|
return 0; |
|
if (index >= 10 && index <= 11 && |
|
!(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP6)) |
|
return 0; |
|
if (index >= 12 && index <= 13 && |
|
!(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP7)) |
|
return 0; |
|
if (index >= 14 && index <= 15 && |
|
!(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP8)) |
|
return 0; |
|
if (index >= 16 && index <= 17 && |
|
!(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP9)) |
|
return 0; |
|
if (index >= 18 && index <= 19 && |
|
!(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP10)) |
|
return 0; |
|
|
|
if (index >= 20 && index <= 23 && |
|
!(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1)) |
|
return 0; |
|
if (index >= 24 && index <= 26 && |
|
!(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2)) |
|
return 0; |
|
if (index >= 27 && index <= 29 && |
|
!(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN3)) |
|
return 0; |
|
|
|
if (index == 23 && !auto_fan) |
|
return 0; |
|
|
|
return attr->mode; |
|
} |
|
|
|
static const struct attribute_group i8k_group = { |
|
.attrs = i8k_attrs, |
|
.is_visible = i8k_is_visible, |
|
}; |
|
__ATTRIBUTE_GROUPS(i8k); |
|
|
|
static int __init i8k_init_hwmon(void) |
|
{ |
|
int err; |
|
|
|
i8k_hwmon_flags = 0; |
|
|
|
/* CPU temperature attributes, if temperature type is OK */ |
|
err = i8k_get_temp_type(0); |
|
if (err >= 0) |
|
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1; |
|
/* check for additional temperature sensors */ |
|
err = i8k_get_temp_type(1); |
|
if (err >= 0) |
|
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2; |
|
err = i8k_get_temp_type(2); |
|
if (err >= 0) |
|
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3; |
|
err = i8k_get_temp_type(3); |
|
if (err >= 0) |
|
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4; |
|
err = i8k_get_temp_type(4); |
|
if (err >= 0) |
|
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP5; |
|
err = i8k_get_temp_type(5); |
|
if (err >= 0) |
|
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP6; |
|
err = i8k_get_temp_type(6); |
|
if (err >= 0) |
|
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP7; |
|
err = i8k_get_temp_type(7); |
|
if (err >= 0) |
|
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP8; |
|
err = i8k_get_temp_type(8); |
|
if (err >= 0) |
|
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP9; |
|
err = i8k_get_temp_type(9); |
|
if (err >= 0) |
|
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP10; |
|
|
|
/* First fan attributes, if fan status or type is OK */ |
|
err = i8k_get_fan_status(0); |
|
if (err < 0) |
|
err = i8k_get_fan_type(0); |
|
if (err >= 0) |
|
i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1; |
|
|
|
/* Second fan attributes, if fan status or type is OK */ |
|
err = i8k_get_fan_status(1); |
|
if (err < 0) |
|
err = i8k_get_fan_type(1); |
|
if (err >= 0) |
|
i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2; |
|
|
|
/* Third fan attributes, if fan status or type is OK */ |
|
err = i8k_get_fan_status(2); |
|
if (err < 0) |
|
err = i8k_get_fan_type(2); |
|
if (err >= 0) |
|
i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN3; |
|
|
|
i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "dell_smm", |
|
NULL, i8k_groups); |
|
if (IS_ERR(i8k_hwmon_dev)) { |
|
err = PTR_ERR(i8k_hwmon_dev); |
|
i8k_hwmon_dev = NULL; |
|
pr_err("hwmon registration failed (%d)\n", err); |
|
return err; |
|
} |
|
return 0; |
|
} |
|
|
|
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[] = { |
|
[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 struct dmi_system_id i8k_blacklist_fan_support_dmi_table[] __initdata = { |
|
{ |
|
.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[] = { |
|
[I8K_FAN_34A3_35A3] = { |
|
.manual_fan = 0x34a3, |
|
.auto_fan = 0x35a3, |
|
}, |
|
}; |
|
|
|
static struct dmi_system_id i8k_whitelist_fan_control[] __initdata = { |
|
{ |
|
.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 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], |
|
}, |
|
{ } |
|
}; |
|
|
|
/* |
|
* Probe for the presence of a supported laptop. |
|
*/ |
|
static int __init i8k_probe(void) |
|
{ |
|
const struct dmi_system_id *id, *fan_control; |
|
int fan, ret; |
|
|
|
/* |
|
* 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)); |
|
} |
|
|
|
if (dmi_check_system(i8k_blacklist_fan_support_dmi_table)) { |
|
pr_warn("broken Dell BIOS detected, disallow fan support\n"); |
|
if (!force) |
|
disallow_fan_support = true; |
|
} |
|
|
|
if (dmi_check_system(i8k_blacklist_fan_type_dmi_table)) { |
|
pr_warn("broken Dell BIOS detected, disallow fan type call\n"); |
|
if (!force) |
|
disallow_fan_type_call = true; |
|
} |
|
|
|
strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION), |
|
sizeof(bios_version)); |
|
strlcpy(bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), |
|
sizeof(bios_machineid)); |
|
|
|
/* |
|
* 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; |
|
} |
|
|
|
/* |
|
* 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; |
|
} |
|
|
|
i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */ |
|
i8k_pwm_mult = DIV_ROUND_UP(255, 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 *data = fan_control->driver_data; |
|
|
|
manual_fan = data->manual_fan; |
|
auto_fan = data->auto_fan; |
|
pr_info("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 < 2; ++fan) { |
|
ret = i8k_get_fan_nominal_speed(fan, i8k_fan_max); |
|
if (ret < 0) |
|
continue; |
|
if (ret > I8K_FAN_MAX_RPM) |
|
i8k_fan_mult = 1; |
|
break; |
|
} |
|
} else { |
|
/* Fan multiplier was specified in module param or in dmi */ |
|
i8k_fan_mult = fan_mult; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int __init i8k_init(void) |
|
{ |
|
int err; |
|
|
|
/* Are we running on an supported laptop? */ |
|
if (i8k_probe()) |
|
return -ENODEV; |
|
|
|
err = i8k_init_hwmon(); |
|
if (err) |
|
return err; |
|
|
|
i8k_init_procfs(); |
|
return 0; |
|
} |
|
|
|
static void __exit i8k_exit(void) |
|
{ |
|
hwmon_device_unregister(i8k_hwmon_dev); |
|
i8k_exit_procfs(); |
|
} |
|
|
|
module_init(i8k_init); |
|
module_exit(i8k_exit);
|
|
|