i8k.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:16k
- /*
- * i8k.c -- Linux driver for accessing the SMM BIOS on Dell laptops.
- * See http://www.debian.org/~dz/i8k/ for more information
- * and for latest version of this driver.
- *
- * Copyright (C) 2001 Massimo Dal Zotto <dz@debian.org>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2, or (at your option) any
- * later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- */
- #include <linux/module.h>
- #include <linux/version.h>
- #include <linux/types.h>
- #include <linux/init.h>
- #include <linux/proc_fs.h>
- #include <linux/apm_bios.h>
- #include <asm/uaccess.h>
- #include <asm/io.h>
- #include <linux/i8k.h>
- #define I8K_VERSION "1.7 21/11/2001"
- #define I8K_SMM_FN_STATUS 0x0025
- #define I8K_SMM_POWER_STATUS 0x0069
- #define I8K_SMM_SET_FAN 0x01a3
- #define I8K_SMM_GET_FAN 0x00a3
- #define I8K_SMM_GET_SPEED 0x02a3
- #define I8K_SMM_GET_TEMP 0x10a3
- #define I8K_SMM_GET_DELL_SIG 0xffa3
- #define I8K_SMM_BIOS_VERSION 0x00a6
- #define I8K_FAN_MULT 30
- #define I8K_MAX_TEMP 127
- #define I8K_FN_NONE 0x00
- #define I8K_FN_UP 0x01
- #define I8K_FN_DOWN 0x02
- #define I8K_FN_MUTE 0x04
- #define I8K_FN_MASK 0x07
- #define I8K_FN_SHIFT 8
- #define I8K_POWER_AC 0x05
- #define I8K_POWER_BATTERY 0x01
- #define I8K_TEMPERATURE_BUG 1
- #define DELL_SIGNATURE "Dell Computer"
- static char *supported_models[] = {
- "Inspiron",
- "Latitude",
- NULL
- };
- static char system_vendor[48] = "?";
- static char product_name [48] = "?";
- static char bios_version [4] = "?";
- static char serial_number[16] = "?";
- int force = 0;
- int power_status = 0;
- MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
- MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
- MODULE_LICENSE("GPL");
- MODULE_PARM(force, "i");
- MODULE_PARM(power_status, "i");
- MODULE_PARM_DESC(force, "Force loading without checking for supported models");
- MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
- static ssize_t i8k_read(struct file *, char *, size_t, loff_t *);
- static int i8k_ioctl(struct inode *, struct file *, unsigned int,
- unsigned long);
- static struct file_operations i8k_fops = {
- read: i8k_read,
- ioctl: i8k_ioctl,
- };
- typedef struct {
- unsigned int eax;
- unsigned int ebx __attribute__ ((packed));
- unsigned int ecx __attribute__ ((packed));
- unsigned int edx __attribute__ ((packed));
- unsigned int esi __attribute__ ((packed));
- unsigned int edi __attribute__ ((packed));
- } SMMRegisters;
- typedef struct {
- u8 type;
- u8 length;
- u16 handle;
- } DMIHeader;
- /*
- * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
- */
- static int i8k_smm(SMMRegisters *regs)
- {
- int rc;
- int eax = regs->eax;
- asm("pushl %%eaxnt"
- "movl 0(%%eax),%%edxnt"
- "push %%edxnt"
- "movl 4(%%eax),%%ebxnt"
- "movl 8(%%eax),%%ecxnt"
- "movl 12(%%eax),%%edxnt"
- "movl 16(%%eax),%%esint"
- "movl 20(%%eax),%%edint"
- "popl %%eaxnt"
- "out %%al,$0xb2nt"
- "out %%al,$0x84nt"
- "xchgl %%eax,(%%esp)nt"
- "movl %%ebx,4(%%eax)nt"
- "movl %%ecx,8(%%eax)nt"
- "movl %%edx,12(%%eax)nt"
- "movl %%esi,16(%%eax)nt"
- "movl %%edi,20(%%eax)nt"
- "popl %%edxnt"
- "movl %%edx,0(%%eax)nt"
- "lahfnt"
- "shrl $8,%%eaxnt"
- "andl $1,%%eaxn"
- : "=a" (rc)
- : "a" (regs)
- : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
- if ((rc != 0) || ((regs->eax & 0xffff) == 0xffff) || (regs->eax == eax)) {
- return -EINVAL;
- }
- return 0;
- }
- /*
- * Read the bios version. Return the version as an integer corresponding
- * to the ascii value, for example "A17" is returned as 0x00413137.
- */
- static int i8k_get_bios_version(void)
- {
- SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
- int rc;
- regs.eax = I8K_SMM_BIOS_VERSION;
- if ((rc=i8k_smm(®s)) < 0) {
- return rc;
- }
- return regs.eax;
- }
- /*
- * Read the machine id.
- */
- static int i8k_get_serial_number(unsigned char *buff)
- {
- strncpy(buff, serial_number, 16);
- return 0;
- }
- /*
- * Read the Fn key status.
- */
- static int i8k_get_fn_status(void)
- {
- SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
- int rc;
- regs.eax = I8K_SMM_FN_STATUS;
- if ((rc=i8k_smm(®s)) < 0) {
- return rc;
- }
- switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
- case I8K_FN_UP:
- return I8K_VOL_UP;
- case I8K_FN_DOWN:
- return I8K_VOL_DOWN;
- case I8K_FN_MUTE:
- return I8K_VOL_MUTE;
- default:
- return 0;
- }
- }
- /*
- * Read the power status.
- */
- static int i8k_get_power_status(void)
- {
- SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
- int rc;
- regs.eax = I8K_SMM_POWER_STATUS;
- if ((rc=i8k_smm(®s)) < 0) {
- return rc;
- }
- switch (regs.eax & 0xff) {
- case I8K_POWER_AC:
- return I8K_AC;
- default:
- return I8K_BATTERY;
- }
- }
- /*
- * Read the fan status.
- */
- static int i8k_get_fan_status(int fan)
- {
- SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
- int rc;
- regs.eax = I8K_SMM_GET_FAN;
- regs.ebx = fan & 0xff;
- if ((rc=i8k_smm(®s)) < 0) {
- return rc;
- }
- return (regs.eax & 0xff);
- }
- /*
- * Read the fan speed in RPM.
- */
- static int i8k_get_fan_speed(int fan)
- {
- SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
- int rc;
- regs.eax = I8K_SMM_GET_SPEED;
- regs.ebx = fan & 0xff;
- if ((rc=i8k_smm(®s)) < 0) {
- return rc;
- }
- return (regs.eax & 0xffff) * I8K_FAN_MULT;
- }
- /*
- * Set the fan speed (off, low, high). Returns the new fan status.
- */
- static int i8k_set_fan(int fan, int speed)
- {
- SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
- int rc;
- speed = (speed < 0) ? 0 : ((speed > I8K_FAN_MAX) ? I8K_FAN_MAX : speed);
- regs.eax = I8K_SMM_SET_FAN;
- regs.ebx = (fan & 0xff) | (speed << 8);
- if ((rc=i8k_smm(®s)) < 0) {
- return rc;
- }
- return (i8k_get_fan_status(fan));
- }
- /*
- * Read the cpu temperature.
- */
- static int i8k_get_cpu_temp(void)
- {
- SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
- int rc;
- int temp;
- #ifdef I8K_TEMPERATURE_BUG
- static int prev = 0;
- #endif
- regs.eax = I8K_SMM_GET_TEMP;
- if ((rc=i8k_smm(®s)) < 0) {
- return rc;
- }
- temp = regs.eax & 0xff;
- #ifdef I8K_TEMPERATURE_BUG
- /*
- * Sometimes the temperature sensor returns 0x99, which is out of range.
- * In this case we return (once) the previous cached value. For example:
- # 1003655137 00000058 00005a4b
- # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
- # 1003655139 00000054 00005c52
- */
- if (temp > I8K_MAX_TEMP) {
- temp = prev;
- prev = I8K_MAX_TEMP;
- } else {
- prev = temp;
- }
- #endif
- return temp;
- }
- static int i8k_get_dell_signature(void)
- {
- SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
- int rc;
- regs.eax = I8K_SMM_GET_DELL_SIG;
- if ((rc=i8k_smm(®s)) < 0) {
- return rc;
- }
- if ((regs.eax == 1145651527) && (regs.edx == 1145392204)) {
- return 0;
- } else {
- return -1;
- }
- }
- static int i8k_ioctl(struct inode *ip, struct file *fp, unsigned int cmd,
- unsigned long arg)
- {
- int val;
- int speed;
- unsigned char buff[16];
- if (!arg) {
- return -EINVAL;
- }
- switch (cmd) {
- case I8K_BIOS_VERSION:
- val = i8k_get_bios_version();
- break;
- case I8K_MACHINE_ID:
- memset(buff, 0, 16);
- val = i8k_get_serial_number(buff);
- break;
- case I8K_FN_STATUS:
- val = i8k_get_fn_status();
- break;
- case I8K_POWER_STATUS:
- val = i8k_get_power_status();
- break;
- case I8K_GET_TEMP:
- val = i8k_get_cpu_temp();
- break;
- case I8K_GET_SPEED:
- if (copy_from_user(&val, (int *)arg, sizeof(int))) {
- return -EFAULT;
- }
- val = i8k_get_fan_speed(val);
- break;
- case I8K_GET_FAN:
- if (copy_from_user(&val, (int *)arg, sizeof(int))) {
- return -EFAULT;
- }
- val = i8k_get_fan_status(val);
- break;
- case I8K_SET_FAN:
- if (copy_from_user(&val, (int *)arg, sizeof(int))) {
- return -EFAULT;
- }
- if (copy_from_user(&speed, (int *)arg+1, sizeof(int))) {
- return -EFAULT;
- }
- val = i8k_set_fan(val, speed);
- break;
- default:
- return -EINVAL;
- }
- if (val < 0) {
- return val;
- }
- switch (cmd) {
- case I8K_BIOS_VERSION:
- if (copy_to_user((int *)arg, &val, 4)) {
- return -EFAULT;
- }
- break;
- case I8K_MACHINE_ID:
- if (copy_to_user((int *)arg, buff, 16)) {
- return -EFAULT;
- }
- break;
- default:
- if (copy_to_user((int *)arg, &val, sizeof(int))) {
- return -EFAULT;
- }
- break;
- }
- return 0;
- }
- /*
- * Print the information for /proc/i8k.
- */
- static int i8k_get_info(char *buffer, char **start, off_t fpos, int length)
- {
- int n, fn_key, cpu_temp, ac_power;
- int left_fan, right_fan, left_speed, right_speed;
- cpu_temp = i8k_get_cpu_temp(); /* 11100 祍 */
- left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 祍 */
- right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 祍 */
- left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 祍 */
- right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 祍 */
- fn_key = i8k_get_fn_status(); /* 750 祍 */
- if (power_status) {
- ac_power = i8k_get_power_status(); /* 14700 祍 */
- } 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
- */
- n = sprintf(buffer, "%s %s %s %d %d %d %d %d %d %dn",
- I8K_PROC_FMT,
- bios_version,
- serial_number,
- cpu_temp,
- left_fan,
- right_fan,
- left_speed,
- right_speed,
- ac_power,
- fn_key);
- return n;
- }
- static ssize_t i8k_read(struct file *f, char *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 = ' ';
- }
- return s;
- }
- /* DMI code, stolen from arch/i386/kernel/dmi_scan.c */
- /*
- * |<-- dmi->length -->|
- * | |
- * |dmi header s=N | string1, , ..., stringN, , ...,