wt/lm-sensors
1
0 Fork 0
mirror of https://github.com/lm-sensors/lm-sensors.git synced 2026-10-26 12:24:33 +00:00
Code Issues Packages Projects Releases Wiki Activity

(amalysh)

Browse Source 
Added high_clock module option.If this option is set
        used Host Master Clock 56KHz (default 14KHz).For now we are save old Host
        Master Clock and after transaction completed restore (otherwise
        it's confuse BIOS and hung Laptop).


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1540 7894878c-1315-0410-8ee3-d5d059ff63e0
This commit is contained in:
Alexander Malysh committed 2002-09-21 00:05:37 +00:00
1 parent 5a52a84ffc
commit faa57a4ef4
1 file changed
+33 -4
Download Patch File Download Diff File Expand all files Collapse all files
kernel/busses/i2c-sis630.c
+33 -4
View File
@@ -22,6 +22,11 @@
/*
Changes:
21.09.2002
Added high_clock module option.If this option is set
used Host Master Clock 56KHz (default 14KHz).For now we are save old Host
Master Clock and after transaction completed restore (otherwise
it's confuse BIOS and hung Laptop).
18.09.2002
Added SIS730 as supported
24.08.2002
@@ -38,6 +43,7 @@
/*
Supports:
SIS 630
SIS 730
Note: we assume there can only be one device, with one SMBus interface.
*/
@@ -129,8 +135,11 @@ static struct sd supported[] = {
/* If force is set to anything different from 0, we forcibly enable the
SIS630. DANGEROUS! */
static int force = 0;
static int high_clock = 0;
MODULE_PARM(force, "i");
MODULE_PARM_DESC(force, "Forcibly enable the SIS630. DANGEROUS!");
MODULE_PARM(high_clock, "i");
MODULE_PARM_DESC(high_clock, "Set Host Master Clock to 56KHz (default 14KHz).");
#ifdef MODULE
@@ -198,6 +207,7 @@ int sis630_transaction(int size) {
int temp;
int result = 0;
int timeout = 0;
u8 oldclock;
/*
Make sure the SMBus host is ready to start transmitting.
@@ -223,8 +233,14 @@ int sis630_transaction(int size) {
}
}
/* disable timeout interrupt , don't set Host Master Clock to 56KHz (it's hung my Laptop)*/
sis630_write(SMB_CNT, 0x00);
/* save old clock, so we can prevent machine to hung */
oldclock = sis630_read(SMB_CNT);
/* disable timeout interrupt , set Host Master Clock to 56KHz if requested */
if (high_clock > 0)
sis630_write(SMB_CNT, 0x20);
else
sis630_write(SMB_CNT, 0x00);
/* clear all sticky bits */
temp = sis630_read(SMB_STS);
@@ -259,14 +275,27 @@ int sis630_transaction(int size) {
result = -1;
printk(KERN_ERR "i2c-sis630.o: Bus collision! "
"SMBus may be locked until next hard reset (or not...)\n");
/* TBD: Datasheet say:
the software should clear this bit and restart SMBUS operation
/*
TBD: Datasheet say:
the software should clear this bit and restart SMBUS operation
*/
}
/* clear all status "sticky" bits */
sis630_write(SMB_STS, temp);
/* restore old Host Master Clock */
if (!(oldclock & 0x20)) {
#ifdef DEBUG
printk(KERN_DEBUG "i2c-sis630.o: SMB_CNT before clock restore 0x%02x\n", sis630_read(SMB_CNT));
#endif
oldclock = sis630_read(SMB_CNT) & ~0x20;
sis630_write(SMB_CNT,oldclock);
#ifdef DEBUG
printk(KERN_DEBUG "i2c-sis630.o: SMB_CNT after clock restore 0x%02x\n", sis630_read(SMB_CNT));
#endif
}
return result;
}