578 lines
13 KiB
C
578 lines
13 KiB
C
/*
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* i8k.c -- Linux driver for accessing the SMM BIOS on Dell laptops.
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* See http://www.debian.org/~dz/i8k/ for more information
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* and for latest version of this driver.
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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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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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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 <asm/uaccess.h>
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#include <asm/io.h>
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#include <linux/i8k.h>
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#define I8K_VERSION "1.14 21/02/2005"
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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_TEMP 0x10a3
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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_SMM_BIOS_VERSION 0x00a6
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#define I8K_FAN_MULT 30
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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 I8K_TEMPERATURE_BUG 1
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static char bios_version[4];
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MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
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MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
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MODULE_LICENSE("GPL");
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static int 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 int 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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static int restricted;
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module_param(restricted, bool, 0);
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MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
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static int 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");
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static int i8k_open_fs(struct inode *inode, struct file *file);
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static int i8k_ioctl(struct inode *, struct file *, unsigned int,
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unsigned long);
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static const struct file_operations i8k_fops = {
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.open = i8k_open_fs,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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.ioctl = i8k_ioctl,
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};
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struct smm_regs {
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unsigned int eax;
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unsigned int ebx __attribute__ ((packed));
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unsigned int ecx __attribute__ ((packed));
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unsigned int edx __attribute__ ((packed));
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unsigned int esi __attribute__ ((packed));
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unsigned int edi __attribute__ ((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(struct smm_regs *regs)
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{
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int rc;
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int eax = regs->eax;
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#if defined(CONFIG_X86_64)
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asm("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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"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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#else
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asm("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":"=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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return -EINVAL;
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return 0;
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}
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/*
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* Read the bios version. Return the version as an integer corresponding
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* to the ascii value, for example "A17" is returned as 0x00413137.
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*/
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static int i8k_get_bios_version(void)
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{
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struct smm_regs regs = { .eax = I8K_SMM_BIOS_VERSION, };
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return i8k_smm(®s) ? : regs.eax;
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}
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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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if ((rc = i8k_smm(®s)) < 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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if ((rc = i8k_smm(®s)) < 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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* 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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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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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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* 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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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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/*
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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 = { .eax = I8K_SMM_GET_TEMP, };
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int rc;
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int temp;
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#ifdef I8K_TEMPERATURE_BUG
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static int prev;
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#endif
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regs.ebx = sensor & 0xff;
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if ((rc = i8k_smm(®s)) < 0)
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return rc;
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temp = regs.eax & 0xff;
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#ifdef I8K_TEMPERATURE_BUG
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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 return (once) the previous cached value. For example:
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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 > I8K_MAX_TEMP) {
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temp = prev;
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prev = I8K_MAX_TEMP;
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} else {
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prev = temp;
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}
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#endif
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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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if ((rc = i8k_smm(®s)) < 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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static int i8k_ioctl(struct inode *ip, struct file *fp, unsigned int cmd,
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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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val = i8k_get_bios_version();
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break;
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case I8K_MACHINE_ID:
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memset(buff, 0, 16);
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strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), 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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/*
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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 */
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left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */
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right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */
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left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */
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right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */
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fn_key = i8k_get_fn_status(); /* 750 µs */
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if (power_status)
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ac_power = i8k_get_power_status(); /* 14700 µs */
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else
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ac_power = -1;
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/*
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* Info:
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*
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* 1) Format version (this will change if format changes)
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* 2) BIOS version
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* 3) BIOS machine ID
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* 4) Cpu temperature
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* 5) Left fan status
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* 6) Right fan status
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* 7) Left fan speed
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* 8) Right fan speed
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* 9) AC power
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* 10) Fn Key status
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*/
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return seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
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I8K_PROC_FMT,
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bios_version,
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i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
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cpu_temp,
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left_fan, right_fan, left_speed, right_speed,
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ac_power, fn_key);
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}
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static int i8k_open_fs(struct inode *inode, struct file *file)
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{
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return single_open(file, i8k_proc_show, NULL);
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}
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static struct dmi_system_id __initdata i8k_dmi_table[] = {
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{
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.ident = "Dell Inspiron",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
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DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
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},
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},
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{
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.ident = "Dell Latitude",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
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DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
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},
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},
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{
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.ident = "Dell Inspiron 2",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
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},
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},
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{
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.ident = "Dell Latitude 2",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
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},
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},
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{ /* UK Inspiron 6400 */
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.ident = "Dell Inspiron 3",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "MM061"),
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},
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},
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{
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.ident = "Dell Inspiron 3",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
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},
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},
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{ }
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};
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/*
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* Probe for the presence of a supported laptop.
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*/
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static int __init i8k_probe(void)
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{
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char buff[4];
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int version;
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/*
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* Get DMI information
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*/
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if (!dmi_check_system(i8k_dmi_table)) {
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if (!ignore_dmi && !force)
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return -ENODEV;
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printk(KERN_INFO "i8k: not running on a supported Dell system.\n");
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printk(KERN_INFO "i8k: vendor=%s, model=%s, version=%s\n",
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i8k_get_dmi_data(DMI_SYS_VENDOR),
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i8k_get_dmi_data(DMI_PRODUCT_NAME),
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i8k_get_dmi_data(DMI_BIOS_VERSION));
|
|
}
|
|
|
|
strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION), sizeof(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)) {
|
|
printk(KERN_ERR "i8k: unable to get SMM Dell signature\n");
|
|
if (!force)
|
|
return -ENODEV;
|
|
}
|
|
|
|
/*
|
|
* Get SMM BIOS version.
|
|
*/
|
|
version = i8k_get_bios_version();
|
|
if (version <= 0) {
|
|
printk(KERN_WARNING "i8k: unable to get SMM BIOS version\n");
|
|
} else {
|
|
buff[0] = (version >> 16) & 0xff;
|
|
buff[1] = (version >> 8) & 0xff;
|
|
buff[2] = (version) & 0xff;
|
|
buff[3] = '\0';
|
|
/*
|
|
* If DMI BIOS version is unknown use SMM BIOS version.
|
|
*/
|
|
if (!dmi_get_system_info(DMI_BIOS_VERSION))
|
|
strlcpy(bios_version, buff, sizeof(bios_version));
|
|
|
|
/*
|
|
* Check if the two versions match.
|
|
*/
|
|
if (strncmp(buff, bios_version, sizeof(bios_version)) != 0)
|
|
printk(KERN_WARNING "i8k: BIOS version mismatch: %s != %s\n",
|
|
buff, bios_version);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init i8k_init(void)
|
|
{
|
|
struct proc_dir_entry *proc_i8k;
|
|
|
|
/* Are we running on an supported laptop? */
|
|
if (i8k_probe())
|
|
return -ENODEV;
|
|
|
|
/* Register the proc entry */
|
|
proc_i8k = create_proc_entry("i8k", 0, NULL);
|
|
if (!proc_i8k)
|
|
return -ENOENT;
|
|
|
|
proc_i8k->proc_fops = &i8k_fops;
|
|
proc_i8k->owner = THIS_MODULE;
|
|
|
|
printk(KERN_INFO
|
|
"Dell laptop SMM driver v%s Massimo Dal Zotto (dz@debian.org)\n",
|
|
I8K_VERSION);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit i8k_exit(void)
|
|
{
|
|
remove_proc_entry("i8k", NULL);
|
|
}
|
|
|
|
module_init(i8k_init);
|
|
module_exit(i8k_exit);
|