![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
789 lines
16 KiB
C
789 lines
16 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/apm_bios.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 "1.13 14/05/2002"
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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_SIG 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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#define DELL_SIGNATURE "Dell Computer"
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static char *supported_models[] = {
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"Inspiron",
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"Latitude",
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NULL
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};
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static char system_vendor[48] = "?";
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static char product_name [48] = "?";
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static char bios_version [4] = "?";
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static char serial_number[16] = "?";
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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 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 ssize_t i8k_read(struct file *, char __user *, size_t, loff_t *);
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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 struct file_operations i8k_fops = {
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.read = i8k_read,
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.ioctl = i8k_ioctl,
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};
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typedef struct {
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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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} SMMRegisters;
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typedef struct {
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u8 type;
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u8 length;
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u16 handle;
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} DMIHeader;
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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(SMMRegisters *regs)
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{
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int rc;
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int eax = regs->eax;
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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" \
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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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if ((rc != 0) || ((regs->eax & 0xffff) == 0xffff) || (regs->eax == eax)) {
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return -EINVAL;
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}
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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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SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
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int rc;
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regs.eax = I8K_SMM_BIOS_VERSION;
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if ((rc=i8k_smm(®s)) < 0) {
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return rc;
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}
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return regs.eax;
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}
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/*
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* Read the machine id.
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*/
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static int i8k_get_serial_number(unsigned char *buff)
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{
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strlcpy(buff, serial_number, sizeof(serial_number));
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return 0;
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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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SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
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int rc;
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regs.eax = I8K_SMM_FN_STATUS;
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if ((rc=i8k_smm(®s)) < 0) {
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return rc;
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}
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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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SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
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int rc;
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regs.eax = I8K_SMM_POWER_STATUS;
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if ((rc=i8k_smm(®s)) < 0) {
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return rc;
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}
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switch (regs.eax & 0xff) {
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case I8K_POWER_AC:
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return I8K_AC;
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default:
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return I8K_BATTERY;
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}
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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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SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
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int rc;
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regs.eax = I8K_SMM_GET_FAN;
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regs.ebx = fan & 0xff;
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if ((rc=i8k_smm(®s)) < 0) {
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return rc;
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}
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return (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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SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
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int rc;
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regs.eax = I8K_SMM_GET_SPEED;
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regs.ebx = fan & 0xff;
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if ((rc=i8k_smm(®s)) < 0) {
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return rc;
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}
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return (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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SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
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int rc;
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speed = (speed < 0) ? 0 : ((speed > I8K_FAN_MAX) ? I8K_FAN_MAX : speed);
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regs.eax = I8K_SMM_SET_FAN;
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regs.ebx = (fan & 0xff) | (speed << 8);
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if ((rc=i8k_smm(®s)) < 0) {
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return rc;
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}
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return (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_cpu_temp(void)
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{
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SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
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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 = 0;
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#endif
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regs.eax = I8K_SMM_GET_TEMP;
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if ((rc=i8k_smm(®s)) < 0) {
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return rc;
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}
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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(void)
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{
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SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
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int rc;
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regs.eax = I8K_SMM_GET_DELL_SIG;
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if ((rc=i8k_smm(®s)) < 0) {
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return rc;
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}
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if ((regs.eax == 1145651527) && (regs.edx == 1145392204)) {
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return 0;
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} else {
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return -1;
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}
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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;
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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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val = i8k_get_serial_number(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_cpu_temp();
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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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}
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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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}
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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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}
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if (copy_from_user(&val, argp, sizeof(int))) {
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return -EFAULT;
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}
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if (copy_from_user(&speed, argp+1, sizeof(int))) {
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return -EFAULT;
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}
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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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}
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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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}
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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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}
|
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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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}
|
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break;
|
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}
|
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|
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return 0;
|
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}
|
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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_get_info(char *buffer, char **start, off_t fpos, int length)
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{
|
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int n, fn_key, cpu_temp, ac_power;
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int left_fan, right_fan, left_speed, right_speed;
|
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|
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cpu_temp = i8k_get_cpu_temp(); /* 11100 <20>s */
|
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left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 <20>s */
|
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right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 <20>s */
|
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left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 <20>s */
|
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right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 <20>s */
|
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fn_key = i8k_get_fn_status(); /* 750 <20>s */
|
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if (power_status) {
|
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ac_power = i8k_get_power_status(); /* 14700 <20>s */
|
||
} else {
|
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ac_power = -1;
|
||
}
|
||
|
||
/*
|
||
* Info:
|
||
*
|
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* 1) Format version (this will change if format changes)
|
||
* 2) BIOS version
|
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* 3) BIOS machine ID
|
||
* 4) Cpu temperature
|
||
* 5) Left fan status
|
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* 6) Right fan status
|
||
* 7) Left fan speed
|
||
* 8) Right fan speed
|
||
* 9) AC power
|
||
* 10) Fn Key status
|
||
*/
|
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n = sprintf(buffer, "%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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serial_number,
|
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cpu_temp,
|
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left_fan,
|
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right_fan,
|
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left_speed,
|
||
right_speed,
|
||
ac_power,
|
||
fn_key);
|
||
|
||
return n;
|
||
}
|
||
|
||
static ssize_t i8k_read(struct file *f, char __user *buffer, size_t len, loff_t *fpos)
|
||
{
|
||
int n;
|
||
char info[128];
|
||
|
||
n = i8k_get_info(info, NULL, 0, 128);
|
||
if (n <= 0) {
|
||
return n;
|
||
}
|
||
|
||
if (*fpos >= n) {
|
||
return 0;
|
||
}
|
||
|
||
if ((*fpos + len) >= n) {
|
||
len = n - *fpos;
|
||
}
|
||
|
||
if (copy_to_user(buffer, info, len) != 0) {
|
||
return -EFAULT;
|
||
}
|
||
|
||
*fpos += len;
|
||
return len;
|
||
}
|
||
|
||
static char* __init string_trim(char *s, int size)
|
||
{
|
||
int len;
|
||
char *p;
|
||
|
||
if ((len = strlen(s)) > size) {
|
||
len = size;
|
||
}
|
||
|
||
for (p=s+len-1; len && (*p==' '); len--,p--) {
|
||
*p = '\0';
|
||
}
|
||
|
||
return s;
|
||
}
|
||
|
||
/* DMI code, stolen from arch/i386/kernel/dmi_scan.c */
|
||
|
||
/*
|
||
* |<-- dmi->length -->|
|
||
* | |
|
||
* |dmi header s=N | string1,\0, ..., stringN,\0, ..., \0
|
||
* | |
|
||
* +-----------------------+
|
||
*/
|
||
static char* __init dmi_string(DMIHeader *dmi, u8 s)
|
||
{
|
||
u8 *p;
|
||
|
||
if (!s) {
|
||
return "";
|
||
}
|
||
s--;
|
||
|
||
p = (u8 *)dmi + dmi->length;
|
||
while (s > 0) {
|
||
p += strlen(p);
|
||
p++;
|
||
s--;
|
||
}
|
||
|
||
return p;
|
||
}
|
||
|
||
static void __init dmi_decode(DMIHeader *dmi)
|
||
{
|
||
u8 *data = (u8 *) dmi;
|
||
char *p;
|
||
|
||
#ifdef I8K_DEBUG
|
||
int i;
|
||
printk("%08x ", (int)data);
|
||
for (i=0; i<data[1] && i<64; i++) {
|
||
printk("%02x ", data[i]);
|
||
}
|
||
printk("\n");
|
||
#endif
|
||
|
||
switch (dmi->type) {
|
||
case 0: /* BIOS Information */
|
||
p = dmi_string(dmi,data[5]);
|
||
if (*p) {
|
||
strlcpy(bios_version, p, sizeof(bios_version));
|
||
string_trim(bios_version, sizeof(bios_version));
|
||
}
|
||
break;
|
||
case 1: /* System Information */
|
||
p = dmi_string(dmi,data[4]);
|
||
if (*p) {
|
||
strlcpy(system_vendor, p, sizeof(system_vendor));
|
||
string_trim(system_vendor, sizeof(system_vendor));
|
||
}
|
||
p = dmi_string(dmi,data[5]);
|
||
if (*p) {
|
||
strlcpy(product_name, p, sizeof(product_name));
|
||
string_trim(product_name, sizeof(product_name));
|
||
}
|
||
p = dmi_string(dmi,data[7]);
|
||
if (*p) {
|
||
strlcpy(serial_number, p, sizeof(serial_number));
|
||
string_trim(serial_number, sizeof(serial_number));
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
|
||
static int __init dmi_table(u32 base, int len, int num, void (*fn)(DMIHeader*))
|
||
{
|
||
u8 *buf;
|
||
u8 *data;
|
||
DMIHeader *dmi;
|
||
int i = 1;
|
||
|
||
buf = ioremap(base, len);
|
||
if (buf == NULL) {
|
||
return -1;
|
||
}
|
||
data = buf;
|
||
|
||
/*
|
||
* Stop when we see al the items the table claimed to have
|
||
* or we run off the end of the table (also happens)
|
||
*/
|
||
while ((i<num) && ((data-buf) < len)) {
|
||
dmi = (DMIHeader *)data;
|
||
/*
|
||
* Avoid misparsing crud if the length of the last
|
||
* record is crap
|
||
*/
|
||
if ((data-buf+dmi->length) >= len) {
|
||
break;
|
||
}
|
||
fn(dmi);
|
||
data += dmi->length;
|
||
/*
|
||
* Don't go off the end of the data if there is
|
||
* stuff looking like string fill past the end
|
||
*/
|
||
while (((data-buf) < len) && (*data || data[1])) {
|
||
data++;
|
||
}
|
||
data += 2;
|
||
i++;
|
||
}
|
||
iounmap(buf);
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int __init dmi_iterate(void (*decode)(DMIHeader *))
|
||
{
|
||
unsigned char buf[20];
|
||
void __iomem *p = ioremap(0xe0000, 0x20000), *q;
|
||
|
||
if (!p)
|
||
return -1;
|
||
|
||
for (q = p; q < p + 0x20000; q += 16) {
|
||
memcpy_fromio(buf, q, 20);
|
||
if (memcmp(buf, "_DMI_", 5)==0) {
|
||
u16 num = buf[13]<<8 | buf[12];
|
||
u16 len = buf [7]<<8 | buf [6];
|
||
u32 base = buf[11]<<24 | buf[10]<<16 | buf[9]<<8 | buf[8];
|
||
#ifdef I8K_DEBUG
|
||
printk(KERN_INFO "DMI %d.%d present.\n",
|
||
buf[14]>>4, buf[14]&0x0F);
|
||
printk(KERN_INFO "%d structures occupying %d bytes.\n",
|
||
buf[13]<<8 | buf[12],
|
||
buf [7]<<8 | buf[6]);
|
||
printk(KERN_INFO "DMI table at 0x%08X.\n",
|
||
buf[11]<<24 | buf[10]<<16 | buf[9]<<8 | buf[8]);
|
||
#endif
|
||
if (dmi_table(base, len, num, decode)==0) {
|
||
iounmap(p);
|
||
return 0;
|
||
}
|
||
}
|
||
}
|
||
iounmap(p);
|
||
return -1;
|
||
}
|
||
/* end of DMI code */
|
||
|
||
/*
|
||
* Get DMI information.
|
||
*/
|
||
static int __init i8k_dmi_probe(void)
|
||
{
|
||
char **p;
|
||
|
||
if (dmi_iterate(dmi_decode) != 0) {
|
||
printk(KERN_INFO "i8k: unable to get DMI information\n");
|
||
return -ENODEV;
|
||
}
|
||
|
||
if (strncmp(system_vendor,DELL_SIGNATURE,strlen(DELL_SIGNATURE)) != 0) {
|
||
printk(KERN_INFO "i8k: not running on a Dell system\n");
|
||
return -ENODEV;
|
||
}
|
||
|
||
for (p=supported_models; ; p++) {
|
||
if (!*p) {
|
||
printk(KERN_INFO "i8k: unsupported model: %s\n", product_name);
|
||
return -ENODEV;
|
||
}
|
||
if (strncmp(product_name,*p,strlen(*p)) == 0) {
|
||
break;
|
||
}
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* Probe for the presence of a supported laptop.
|
||
*/
|
||
static int __init i8k_probe(void)
|
||
{
|
||
char buff[4];
|
||
int version;
|
||
int smm_found = 0;
|
||
|
||
/*
|
||
* Get DMI information
|
||
*/
|
||
if (i8k_dmi_probe() != 0) {
|
||
printk(KERN_INFO "i8k: vendor=%s, model=%s, version=%s\n",
|
||
system_vendor, product_name, bios_version);
|
||
}
|
||
|
||
/*
|
||
* Get SMM Dell signature
|
||
*/
|
||
if (i8k_get_dell_signature() != 0) {
|
||
printk(KERN_INFO "i8k: unable to get SMM Dell signature\n");
|
||
} else {
|
||
smm_found = 1;
|
||
}
|
||
|
||
/*
|
||
* Get SMM BIOS version.
|
||
*/
|
||
version = i8k_get_bios_version();
|
||
if (version <= 0) {
|
||
printk(KERN_INFO "i8k: unable to get SMM BIOS version\n");
|
||
} else {
|
||
smm_found = 1;
|
||
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 (bios_version[0] == '?') {
|
||
strcpy(bios_version, buff);
|
||
}
|
||
/*
|
||
* Check if the two versions match.
|
||
*/
|
||
if (strncmp(buff,bios_version,sizeof(bios_version)) != 0) {
|
||
printk(KERN_INFO "i8k: BIOS version mismatch: %s != %s\n",
|
||
buff, bios_version);
|
||
}
|
||
}
|
||
|
||
if (!smm_found && !force) {
|
||
return -ENODEV;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
#ifdef MODULE
|
||
static
|
||
#endif
|
||
int __init i8k_init(void)
|
||
{
|
||
struct proc_dir_entry *proc_i8k;
|
||
|
||
/* Are we running on an supported laptop? */
|
||
if (i8k_probe() != 0) {
|
||
return -ENODEV;
|
||
}
|
||
|
||
/* Register the proc entry */
|
||
proc_i8k = create_proc_info_entry("i8k", 0, NULL, i8k_get_info);
|
||
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;
|
||
}
|
||
|
||
#ifdef MODULE
|
||
int init_module(void)
|
||
{
|
||
return i8k_init();
|
||
}
|
||
|
||
void cleanup_module(void)
|
||
{
|
||
/* Remove the proc entry */
|
||
remove_proc_entry("i8k", NULL);
|
||
|
||
printk(KERN_INFO "i8k: module unloaded\n");
|
||
}
|
||
#endif
|
||
|
||
/* end of file */
|