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authorLen Brown <len.brown@intel.com>2007-04-30 23:27:43 -0400
committerLen Brown <len.brown@intel.com>2007-04-30 23:27:43 -0400
commiteaca2d3f6c4de9d4274a4e2be54c9693e76b0303 (patch)
tree9e62d1c292e0e4ffce1aea88a37f4aec5fb0281a
parent11ccc0f249cb01a129f54760b8ff087f242935d4 (diff)
downloadop-kernel-dev-eaca2d3f6c4de9d4274a4e2be54c9693e76b0303.zip
op-kernel-dev-eaca2d3f6c4de9d4274a4e2be54c9693e76b0303.tar.gz
ACPI: delete un-reliable concept of cooling mode
The scheme where the thermal driver displayed the cooling mode /proc/acpi/thermal_zone/*/cooling_mode was flawed in two ways. First, the success of _SCP doesn't actually mean that the BIOS moved any trip points. On many BIOS, _SCP is present, but does nothing. So displaying what _SCP executed actually was wrong more times than it was right. Second, examining the relative position of the trip points when the thermal_zone is added is insufficient -- as the BIOS reserves the right to change the trip points at run-time. The only reliable way for the user to determine if the thermal zone is in active, passive, or critical mode is to examine the relative position of the trip points. The user can do this without the kernel doing it for them by looking in /proc/acpi/thermal_zone/*/trip_points New contents for /proc/acpi/thermal_zone/*/cooling_mode: If _SCP available: "0 - Active; 1 - Passive\n" If _SCP unavailable: "<setting not supported>\n" Signed-off-by: Len Brown <len.brown@intel.com>
-rw-r--r--drivers/acpi/thermal.c39
1 files changed, 2 insertions, 37 deletions
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 73b6fe7..1ada017 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -59,8 +59,6 @@
#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
#define ACPI_THERMAL_NOTIFY_HOT 0xF1
#define ACPI_THERMAL_MODE_ACTIVE 0x00
-#define ACPI_THERMAL_MODE_PASSIVE 0x01
-#define ACPI_THERMAL_MODE_CRITICAL 0xff
#define ACPI_THERMAL_PATH_POWEROFF "/sbin/poweroff"
#define ACPI_THERMAL_MAX_ACTIVE 10
@@ -164,7 +162,6 @@ struct acpi_thermal {
unsigned long temperature;
unsigned long last_temperature;
unsigned long polling_frequency;
- u8 cooling_mode;
volatile u8 zombie;
struct acpi_thermal_flags flags;
struct acpi_thermal_state state;
@@ -293,11 +290,6 @@ static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
if (ACPI_FAILURE(status))
return -ENODEV;
- tz->cooling_mode = mode;
-
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling mode [%s]\n",
- mode ? "passive" : "active"));
-
return 0;
}
@@ -893,15 +885,10 @@ static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
if (!tz)
goto end;
- if (!tz->flags.cooling_mode) {
+ if (!tz->flags.cooling_mode)
seq_puts(seq, "<setting not supported>\n");
- }
-
- if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
- seq_printf(seq, "cooling mode: critical\n");
else
- seq_printf(seq, "cooling mode: %s\n",
- tz->cooling_mode ? "passive" : "active");
+ seq_puts(seq, "0 - Active; 1 - Passive\n");
end:
return 0;
@@ -1158,28 +1145,6 @@ static int acpi_thermal_get_info(struct acpi_thermal *tz)
result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
if (!result)
tz->flags.cooling_mode = 1;
- else {
- /* Oh,we have not _SCP method.
- Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
- tz->flags.cooling_mode = 0;
- if (tz->trips.active[0].flags.valid
- && tz->trips.passive.flags.valid) {
- if (tz->trips.passive.temperature >
- tz->trips.active[0].temperature)
- tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
- else
- tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
- } else if (!tz->trips.active[0].flags.valid
- && tz->trips.passive.flags.valid) {
- tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
- } else if (tz->trips.active[0].flags.valid
- && !tz->trips.passive.flags.valid) {
- tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
- } else {
- /* _ACx and _PSV are optional, but _CRT is required */
- tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
- }
- }
/* Get default polling frequency [_TZP] (optional) */
if (tzp)
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