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thinkpad-acpi: forbid the use of HBRV on Lenovo ThinkPads

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Forcing thinkpad-acpi to do EC-based brightness control (HBRV) on a
X61 has very... interesting effects, instead of doing nothing (since
it doesn't have EC-based backlight control), it causes "weirdness" in
the fan tachometer readings, for example.

This means the EC register that used to be HBRV has been reused by
Lenovo for something else, but they didn't remove it from the DSDT.

Make sure the documentation reflects this data, and forbid the user
from forcing the driver to access HBRV on Lenovo ThinkPads.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Henrique de Moraes Holschuh
2009-06-18 00:40:16 -03:00
committed by Len Brown
parent 8bf3d4c535
commit d7880f10c5
2 changed files with 18 additions and 6 deletions
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10
drivers/platform/x86/thinkpad_acpi.c
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@@ -5696,6 +5696,10 @@ static struct ibm_struct ecdump_driver_data = {
* Bit 3-0: backlight brightness level
*
* brightness_get_raw returns status data in the HBRV layout
*
* WARNING: The X61 has been verified to use HBRV for something else, so
* this should be used _only_ on IBM ThinkPads, and maybe with some careful
* testing on the very early *60 Lenovo models...
*/
enum {
@@ -5996,6 +6000,12 @@ static int __init brightness_init(struct ibm_init_struct *iibm)
brightness_mode);
}
/* Safety */
if (thinkpad_id.vendor != PCI_VENDOR_ID_IBM &&
(brightness_mode == TPACPI_BRGHT_MODE_ECNVRAM ||
brightness_mode == TPACPI_BRGHT_MODE_EC))
return -EINVAL;
if (tpacpi_brightness_get_raw(&b) < 0)
return 1;