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[PATCH] I8K: use standard DMI interface 

I8K: Change to use stock dmi infrastructure instead of homegrown
     parsing code. The driver now requires box's DMI data to match
     list of supported models so driver can be safely compiled-in
     by default without fear of it poking into random SMM BIOS
     code. DMI checks can be ignored with i8k.ignore_dmi option.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Dmitry Torokhov 2005-06-25 14:54:25 -07:00 committed by Linus Torvalds
parent dec63ec32e
commit e70c9d5e61
4 changed files with 60 additions and 252 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/kernel-parameters.txt
View File

@ -548,6 +548,9 @@ running once the system is up.
i810= [HW,DRM]
i8k.ignore_dmi [HW] Continue probing hardware even if DMI data
indicates that the driver is running on unsupported
hardware.
i8k.force [HW] Activate i8k driver even if SMM BIOS signature
does not match list of supported models.
i8k.power_status

6
arch/i386/kernel/dmi_scan.c
View File

@ -414,6 +414,7 @@ static void __init dmi_decode(struct dmi_header *dm)
dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
dmi_printk(("Serial Number: %s\n",
dmi_string(dm, data[7])));
dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
break;
case 2:
dmi_printk(("Board Vendor: %s\n",
@ -470,7 +471,6 @@ fail: d++;
return count;
}
EXPORT_SYMBOL(dmi_check_system);
/**
@ -480,8 +480,8 @@ EXPORT_SYMBOL(dmi_check_system);
* Returns one DMI data value, can be used to perform
* complex DMI data checks.
*/
char * dmi_get_system_info(int field)
char *dmi_get_system_info(int field)
{
return dmi_ident[field];
}
EXPORT_SYMBOL(dmi_get_system_info);

302
drivers/char/i8k.c
View File

@ -20,7 +20,7 @@
#include <linux/types.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/apm_bios.h>
#include <linux/dmi.h>
#include <asm/uaccess.h>
#include <asm/io.h>
@ -52,18 +52,7 @@
#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] = "?";
static char bios_version[4];
MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
@ -73,6 +62,10 @@ static int force;
module_param(force, bool, 0);
MODULE_PARM_DESC(force, "Force loading without checking for supported models");
static int ignore_dmi;
module_param(ignore_dmi, bool, 0);
MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
static int restricted;
module_param(restricted, bool, 0);
MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
@ -99,11 +92,10 @@ typedef struct {
unsigned int edi __attribute__ ((packed));
} SMMRegisters;
typedef struct {
u8 type;
u8 length;
u16 handle;
} DMIHeader;
static inline char *i8k_get_dmi_data(int field)
{
return dmi_get_system_info(field) ? : "N/A";
}
/*
* Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
@ -162,15 +154,6 @@ static int i8k_get_bios_version(void)
return regs.eax;
}
/*
* Read the machine id.
*/
static int i8k_get_serial_number(unsigned char *buff)
{
strlcpy(buff, serial_number, sizeof(serial_number));
return 0;
}
/*
* Read the Fn key status.
*/
@ -328,7 +311,7 @@ static int i8k_get_dell_signature(void)
static int i8k_ioctl(struct inode *ip, struct file *fp, unsigned int cmd,
unsigned long arg)
{
int val;
int val = 0;
int speed;
unsigned char buff[16];
int __user *argp = (int __user *)arg;
@ -343,7 +326,7 @@ static int i8k_ioctl(struct inode *ip, struct file *fp, unsigned int cmd,
case I8K_MACHINE_ID:
memset(buff, 0, 16);
val = i8k_get_serial_number(buff);
strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), sizeof(buff));
break;
case I8K_FN_STATUS:
@ -451,10 +434,10 @@ static int i8k_get_info(char *buffer, char **start, off_t fpos, int length)
n = sprintf(buffer, "%s %s %s %d %d %d %d %d %d %d\n",
I8K_PROC_FMT,
bios_version,
serial_number,
dmi_get_system_info(DMI_PRODUCT_SERIAL) ? : "N/A",
cpu_temp,
left_fan,
right_fan, left_speed, right_speed, ac_power, fn_key);
left_fan, right_fan, left_speed, right_speed,
ac_power, fn_key);
return n;
}
@ -486,201 +469,23 @@ static ssize_t i8k_read(struct file *f, char __user * buffer, size_t 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;
}
static struct dmi_system_id __initdata i8k_dmi_table[] = {
{
.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"),
},
},
{ }
};
/*
* Probe for the presence of a supported laptop.
@ -689,23 +494,30 @@ static int __init i8k_probe(void)
{
char buff[4];
int version;
int smm_found = 0;
/*
* Get DMI information
*/
if (i8k_dmi_probe() != 0) {
if (!dmi_check_system(i8k_dmi_table)) {
if (!ignore_dmi && !force)
return -ENODEV;
printk(KERN_INFO "i8k: not running on a supported Dell system.\n");
printk(KERN_INFO "i8k: vendor=%s, model=%s, version=%s\n",
system_vendor, product_name, bios_version);
i8k_get_dmi_data(DMI_SYS_VENDOR),
i8k_get_dmi_data(DMI_PRODUCT_NAME),
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() != 0) {
printk(KERN_INFO "i8k: unable to get SMM Dell signature\n");
} else {
smm_found = 1;
printk(KERN_ERR "i8k: unable to get SMM Dell signature\n");
if (!force)
return -ENODEV;
}
/*
@ -713,9 +525,8 @@ static int __init i8k_probe(void)
*/
version = i8k_get_bios_version();
if (version <= 0) {
printk(KERN_INFO "i8k: unable to get SMM BIOS version\n");
printk(KERN_WARNING "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;
@ -723,21 +534,15 @@ static int __init i8k_probe(void)
/*
* If DMI BIOS version is unknown use SMM BIOS version.
*/
if (bios_version[0] == '?') {
strcpy(bios_version, buff);
}
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_INFO
"i8k: BIOS version mismatch: %s != %s\n", buff,
bios_version);
}
}
if (!smm_found && !force) {
return -ENODEV;
if (strncmp(buff, bios_version, sizeof(bios_version)) != 0)
printk(KERN_WARNING "i8k: BIOS version mismatch: %s != %s\n",
buff, bios_version);
}
return 0;
@ -751,9 +556,8 @@ int __init i8k_init(void)
struct proc_dir_entry *proc_i8k;
/* Are we running on an supported laptop? */
if (i8k_probe() != 0) {
if (i8k_probe())
return -ENODEV;
}
/* Register the proc entry */
proc_i8k = create_proc_info_entry("i8k", 0, NULL, i8k_get_info);

1
include/linux/dmi.h
View File

@ -9,6 +9,7 @@ enum dmi_field {
DMI_SYS_VENDOR,
DMI_PRODUCT_NAME,
DMI_PRODUCT_VERSION,
DMI_PRODUCT_SERIAL,
DMI_BOARD_VENDOR,
DMI_BOARD_NAME,
DMI_BOARD_VERSION,