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SubjectRe: Linux 2.4.0test11-ac2
Date
From
Hi Alan,

Alan Cox <alan@lxorguk.ukuu.org.uk> writes:
>
> Changes in 2.4.0test11ac2
>
> o APM update (Stephen Rothwell)
> o Work arounds for broken Dell laptop APM (me)

Here is (in my opinion) a better patch. It also means that we can
use apm as a module and have the Dell workaround work.

Most of this patch is a change of mind on my part after I posted
my previous patch ... (sorry about that).

This patch also make unloading of the apm module impossible is
someone has /proc/apm open ... (BUG FIX)

Patch against 2.4.0test11ac2.

Cheers,
Stephen
--
Stephen Rothwell, Open Source Researcher, Linuxcare, Inc.
+61-2-62628990 tel, +61-2-62628991 fax
sfr@linuxcare.com, http://www.linuxcare.com/
Linuxcare. Support for the revolution.

diff -ruN 2.4.0-test11-ac2/arch/i386/kernel/apm.c 2.4.0-test11-ac2-APM.2/arch/i386/kernel/apm.c
--- 2.4.0-test11-ac2/arch/i386/kernel/apm.c Thu Nov 23 10:29:19 2000
+++ 2.4.0-test11-ac2-APM.2/arch/i386/kernel/apm.c Thu Nov 23 12:47:02 2000
@@ -338,7 +338,6 @@
#endif
static int debug;
static int apm_disabled;
-static int dell_crap; /* Set for broken 5000e */
#ifdef CONFIG_SMP
static int power_off;
#else
@@ -564,7 +563,7 @@
#ifdef ALWAYS_CALL_BUSY
clock_slowed = 1;
#else
- clock_slowed = (apm_info.bios_info.flags & APM_IDLE_SLOWS_CLOCK) != 0;
+ clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
#endif
return 1;
}
@@ -675,15 +674,15 @@
{
u32 eax;

- if ((enable == 0) && (apm_info.bios_info.flags & APM_BIOS_DISENGAGED))
+ if ((enable == 0) && (apm_info.bios.flags & APM_BIOS_DISENGAGED))
return APM_NOT_ENGAGED;
if (apm_bios_call_simple(APM_FUNC_ENABLE_PM, APM_DEVICE_BALL,
enable, &eax))
return (eax >> 8) & 0xff;
if (enable)
- apm_info.bios_info.flags &= ~APM_BIOS_DISABLED;
+ apm_info.bios.flags &= ~APM_BIOS_DISABLED;
else
- apm_info.bios_info.flags |= APM_BIOS_DISABLED;
+ apm_info.bios.flags |= APM_BIOS_DISABLED;
return APM_SUCCESS;
}
#endif
@@ -696,6 +695,8 @@
u32 edx;
u32 dummy;

+ if (apm_info.get_power_status_broken)
+ return APM_32_UNSUPPORTED;
if (apm_bios_call(APM_FUNC_GET_STATUS, APM_DEVICE_ALL, 0,
&eax, &ebx, &ecx, &edx, &dummy))
return (eax >> 8) & 0xff;
@@ -739,15 +740,15 @@
u32 eax;

if ((enable == 0) && (device == APM_DEVICE_ALL)
- && (apm_info.bios_info.flags & APM_BIOS_DISABLED))
+ && (apm_info.bios.flags & APM_BIOS_DISABLED))
return APM_DISABLED;
if (apm_bios_call_simple(APM_FUNC_ENGAGE_PM, device, enable, &eax))
return (eax >> 8) & 0xff;
if (device == APM_DEVICE_ALL) {
if (enable)
- apm_info.bios_info.flags &= ~APM_BIOS_DISENGAGED;
+ apm_info.bios.flags &= ~APM_BIOS_DISENGAGED;
else
- apm_info.bios_info.flags |= APM_BIOS_DISENGAGED;
+ apm_info.bios.flags |= APM_BIOS_DISENGAGED;
}
return APM_SUCCESS;
}
@@ -1333,19 +1334,6 @@
return 0;
}

-/*
- * This is called by the DMI code when it finds an Inspiron 5000e
- * (aka compal reference board). We actually do the check by the BIOS
- * vendor name, version and serial so we can extend it to try and catch
- * non Dell stuff later.
- */
-
-void apm_battery_horked(void)
-{
- dell_crap = 1;
-}
-
-
static int apm_get_info(char *buf, char **start, off_t fpos, int length)
{
char * p;
@@ -1362,7 +1350,7 @@

p = buf;

- if ((smp_num_cpus == 1) && !dell_crap &&
+ if ((smp_num_cpus == 1) &&
!(error = apm_get_power_status(&bx, &cx, &dx))) {
ac_line_status = (bx >> 8) & 0xff;
battery_status = bx & 0xff;
@@ -1417,9 +1405,9 @@

p += sprintf(p, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
driver_version,
- (apm_info.bios_info.version >> 8) & 0xff,
- apm_info.bios_info.version & 0xff,
- apm_info.bios_info.flags,
+ (apm_info.bios.version >> 8) & 0xff,
+ apm_info.bios.version & 0xff,
+ apm_info.bios.flags,
ac_line_status,
battery_status,
battery_flag,
@@ -1448,7 +1436,7 @@
current->tty = NULL; /* get rid of controlling tty */

if (apm_info.connection_version == 0) {
- apm_info.connection_version = apm_info.bios_info.version;
+ apm_info.connection_version = apm_info.bios.version;
if (apm_info.connection_version > 0x100) {
/*
* We only support BIOSs up to version 1.2
@@ -1470,7 +1458,7 @@
apm_info.connection_version & 0xff);

#ifdef CONFIG_APM_DO_ENABLE
- if (apm_info.bios_info.flags & APM_BIOS_DISABLED) {
+ if (apm_info.bios.flags & APM_BIOS_DISABLED) {
/*
* This call causes my NEC UltraLite Versa 33/C to hang if it
* is booted with PM disabled but not in the docking station.
@@ -1484,7 +1472,7 @@
}
#endif

- if ((apm_info.bios_info.flags & APM_BIOS_DISENGAGED)
+ if ((apm_info.bios.flags & APM_BIOS_DISENGAGED)
&& (apm_info.connection_version > 0x0100)) {
error = apm_engage_power_management(APM_DEVICE_ALL, 1);
if (error) {
@@ -1610,17 +1598,19 @@
*/
static int __init apm_init(void)
{
- if (apm_info.bios_info.version == 0) {
+ struct proc_dir_entry *apm_proc;
+
+ if (apm_info.bios.version == 0) {
printk(KERN_INFO "apm: BIOS not found.\n");
return -ENODEV;
}
printk(KERN_INFO
"apm: BIOS version %d.%d Flags 0x%02x (Driver version %s)\n",
- ((apm_info.bios_info.version >> 8) & 0xff),
- (apm_info.bios_info.version & 0xff),
- apm_info.bios_info.flags,
+ ((apm_info.bios.version >> 8) & 0xff),
+ (apm_info.bios.version & 0xff),
+ apm_info.bios.flags,
driver_version);
- if ((apm_info.bios_info.flags & APM_32_BIT_SUPPORT) == 0) {
+ if ((apm_info.bios.flags & APM_32_BIT_SUPPORT) == 0) {
printk(KERN_INFO "apm: no 32 bit BIOS support\n");
return -ENODEV;
}
@@ -1629,23 +1619,23 @@
* Fix for the Compaq Contura 3/25c which reports BIOS version 0.1
* but is reportedly a 1.0 BIOS.
*/
- if (apm_info.bios_info.version == 0x001)
- apm_info.bios_info.version = 0x100;
+ if (apm_info.bios.version == 0x001)
+ apm_info.bios.version = 0x100;

/* BIOS < 1.2 doesn't set cseg_16_len */
- if (apm_info.bios_info.version < 0x102)
- apm_info.bios_info.cseg_16_len = 0; /* 64k */
+ if (apm_info.bios.version < 0x102)
+ apm_info.bios.cseg_16_len = 0; /* 64k */

if (debug) {
printk(KERN_INFO "apm: entry %x:%lx cseg16 %x dseg %x",
- apm_info.bios_info.cseg, apm_info.bios_info.offset,
- apm_info.bios_info.cseg_16, apm_info.bios_info.dseg);
- if (apm_info.bios_info.version > 0x100)
+ apm_info.bios.cseg, apm_info.bios.offset,
+ apm_info.bios.cseg_16, apm_info.bios.dseg);
+ if (apm_info.bios.version > 0x100)
printk(" cseg len %x, dseg len %x",
- apm_info.bios_info.cseg_len,
- apm_info.bios_info.dseg_len);
- if (apm_info.bios_info.version > 0x101)
- printk(" cseg16 len %x", apm_info.bios_info.cseg_16_len);
+ apm_info.bios.cseg_len,
+ apm_info.bios.dseg_len);
+ if (apm_info.bios.version > 0x101)
+ printk(" cseg16 len %x", apm_info.bios.cseg_16_len);
printk("\n");
}

@@ -1673,16 +1663,16 @@
__va((unsigned long)0x40 << 4));
_set_limit((char *)&gdt[APM_40 >> 3], 4095 - (0x40 << 4));

- apm_bios_entry.offset = apm_info.bios_info.offset;
+ apm_bios_entry.offset = apm_info.bios.offset;
apm_bios_entry.segment = APM_CS;
set_base(gdt[APM_CS >> 3],
- __va((unsigned long)apm_info.bios_info.cseg << 4));
+ __va((unsigned long)apm_info.bios.cseg << 4));
set_base(gdt[APM_CS_16 >> 3],
- __va((unsigned long)apm_info.bios_info.cseg_16 << 4));
+ __va((unsigned long)apm_info.bios.cseg_16 << 4));
set_base(gdt[APM_DS >> 3],
- __va((unsigned long)apm_info.bios_info.dseg << 4));
+ __va((unsigned long)apm_info.bios.dseg << 4));
#ifndef APM_RELAX_SEGMENTS
- if (apm_info.bios_info.version == 0x100) {
+ if (apm_info.bios.version == 0x100) {
#endif
/* For ASUS motherboard, Award BIOS rev 110 (and others?) */
_set_limit((char *)&gdt[APM_CS >> 3], 64 * 1024 - 1);
@@ -1693,15 +1683,17 @@
#ifndef APM_RELAX_SEGMENTS
} else {
_set_limit((char *)&gdt[APM_CS >> 3],
- (apm_info.bios_info.cseg_len - 1) & 0xffff);
+ (apm_info.bios.cseg_len - 1) & 0xffff);
_set_limit((char *)&gdt[APM_CS_16 >> 3],
- (apm_info.bios_info.cseg_16_len - 1) & 0xffff);
+ (apm_info.bios.cseg_16_len - 1) & 0xffff);
_set_limit((char *)&gdt[APM_DS >> 3],
- (apm_info.bios_info.dseg_len - 1) & 0xffff);
+ (apm_info.bios.dseg_len - 1) & 0xffff);
}
#endif

- create_proc_info_entry("apm", 0, NULL, apm_get_info);
+ apm_proc = create_proc_info_entry("apm", 0, NULL, apm_get_info);
+ if (apm_proc)
+ apm_proc->owner = THIS_MODULE;

kernel_thread(apm, NULL, CLONE_FS | CLONE_FILES | CLONE_SIGHAND | SIGCHLD);

@@ -1720,7 +1712,7 @@
{
int error;

- if (((apm_info.bios_info.flags & APM_BIOS_DISENGAGED) == 0)
+ if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
&& (apm_info.connection_version > 0x0100)) {
error = apm_engage_power_management(APM_DEVICE_ALL, 0);
if (error)
diff -ruN 2.4.0-test11-ac2/arch/i386/kernel/dmi_scan.c 2.4.0-test11-ac2-APM.2/arch/i386/kernel/dmi_scan.c
--- 2.4.0-test11-ac2/arch/i386/kernel/dmi_scan.c Thu Nov 23 10:29:19 2000
+++ 2.4.0-test11-ac2-APM.2/arch/i386/kernel/dmi_scan.c Thu Nov 23 12:49:28 2000
@@ -3,6 +3,7 @@
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.h>
+#include <linux/apm_bios.h>
#include <asm/io.h>

struct dmi_header
@@ -127,11 +128,8 @@
strcmp(dmi_string(dm, data[5]), "A04")==0)
// &&strcmp(dmi_string(dm, data[8]), "???")==0)
{
-#ifdef CONFIG_APM
- extern void apm_battery_horked(void);
- apm_battery_horked();
- printk(KERN_WARNING "BIOS strings suggest APM bugs, disabling battery reporting.\n");
-#endif
+ apm_info.get_power_status_broken = 1;
+ printk(KERN_WARNING "BIOS strings suggest APM bugs, disabling power status reporting.\n");
}
break;
case 1:
diff -ruN 2.4.0-test11-ac2/arch/i386/kernel/setup.c 2.4.0-test11-ac2-APM.2/arch/i386/kernel/setup.c
--- 2.4.0-test11-ac2/arch/i386/kernel/setup.c Thu Nov 23 10:29:19 2000
+++ 2.4.0-test11-ac2-APM.2/arch/i386/kernel/setup.c Thu Nov 23 12:06:10 2000
@@ -608,7 +608,7 @@
ROOT_DEV = to_kdev_t(ORIG_ROOT_DEV);
drive_info = DRIVE_INFO;
screen_info = SCREEN_INFO;
- apm_info.bios_info = APM_BIOS_INFO;
+ apm_info.bios = APM_BIOS_INFO;
if( SYS_DESC_TABLE.length != 0 ) {
MCA_bus = SYS_DESC_TABLE.table[3] &0x2;
machine_id = SYS_DESC_TABLE.table[0];
diff -ruN 2.4.0-test11-ac2/include/linux/apm_bios.h 2.4.0-test11-ac2-APM.2/include/linux/apm_bios.h
--- 2.4.0-test11-ac2/include/linux/apm_bios.h Thu Nov 23 10:29:22 2000
+++ 2.4.0-test11-ac2-APM.2/include/linux/apm_bios.h Thu Nov 23 12:47:33 2000
@@ -49,8 +49,9 @@
* Data for APM that is persistant across module unload/load
*/
struct apm_info {
- struct apm_bios_info bios_info;
+ struct apm_bios_info bios;
unsigned short connection_version;
+ int get_power_status_broken;
};

/*
-
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