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authorHenrique de Moraes Holschuh <hmh@hmh.eng.br>2009-06-18 00:40:16 -0300
committerLen Brown <len.brown@intel.com>2009-06-18 01:30:35 -0400
commitd7880f10c5d42ba182a97c1fd41d41d0b8837097 (patch)
tree56c7b64874b841d925467995dccf915545cde69e /drivers/platform/x86
parent8bf3d4c535c2b9689c2979b281c24e9f59c2f4ad (diff)
thinkpad-acpi: forbid the use of HBRV on Lenovo ThinkPads
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>
Diffstat (limited to 'drivers/platform/x86')
-rw-r--r--drivers/platform/x86/thinkpad_acpi.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 5a22a064222..c8d74dbacbb 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -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;