Implement a loader tunable/sysctl to allow the user to request that
the APM driver byte-swap battery time values. (For broken laptops.) PR: i386/42439 Submitted by: Bruce M Simpson <bms@spc.org>
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=116665
@ -38,6 +38,7 @@ __FBSDID("$FreeBSD$");
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#include <machine/apm_bios.h>
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#include <machine/clock.h>
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#include <machine/endian.h>
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#include <machine/pc/bios.h>
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#include <machine/cpufunc.h>
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#include <machine/segments.h>
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@ -119,6 +120,7 @@ static struct cdevsw apm_cdevsw = {
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static int apm_suspend_delay = 1;
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static int apm_standby_delay = 1;
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static int apm_swab_batt_minutes = 0;
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static int apm_debug = 0;
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#define APM_DPRINT(args...) do { \
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@ -131,6 +133,10 @@ SYSCTL_INT(_machdep, OID_AUTO, apm_suspend_delay, CTLFLAG_RW, &apm_suspend_delay
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SYSCTL_INT(_machdep, OID_AUTO, apm_standby_delay, CTLFLAG_RW, &apm_standby_delay, 1, "");
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SYSCTL_INT(_debug, OID_AUTO, apm_debug, CTLFLAG_RW, &apm_debug, 0, "");
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TUNABLE_INT("machdep.apm_swab_batt_minutes", &apm_swab_batt_minutes);
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SYSCTL_INT(_machdep, OID_AUTO, apm_swab_batt_minutes, CTLFLAG_RW,
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&apm_swab_batt_minutes, 0, "Byte swap battery time value.");
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#ifdef PC98
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static __inline void
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apm_enable_smm(sc)
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@ -629,6 +635,8 @@ apm_get_pwstatus(apm_pwstatus_t app)
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app->ap_batt_flag = (sc->bios.r.ecx >> 8) & 0xff;
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app->ap_batt_life = sc->bios.r.ecx & 0xff;
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sc->bios.r.edx &= 0xffff;
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if (apm_swab_batt_minutes)
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sc->bios.r.edx = __bswap16(sc->bios.r.edx) | 0x8000;
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if (sc->bios.r.edx == 0xffff) /* Time is unknown */
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app->ap_batt_time = -1;
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else if (sc->bios.r.edx & 0x8000) /* Time is in minutes */
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