Some BIOS versions/Vaio models apparently ship with two nearly identical
functions to handle backlight related controls.
The only difference seems to be:
If (LEqual (BUF1, 0x40))
{
Store (0x40, P80H)
Store (BUF2, Local0)
- And (Local0, One, Local0)
+ And (Local0, 0x03, Local0)
Store (Local0, ^^H_EC.KLPC)
}
Avoid erroring out on initialization and messing things up on cleanup
for now since we never call into these methods with anything different
than 1 or 0.
This issue was found on a Sony VPCSE1V9E/BIOS R2087H4.
Cc: Marco Krüger <[email protected]>
Signed-off-by: Mattia Dongili <[email protected]>
---
Hi Matthew,
could you pick this patch up for 3.13?
Similar code would probably be good to have for consistency on all other *setup
functions but I really don't have enough time to go through it now and this has
been an issue for Marco for quite some time now.
---
drivers/platform/x86/sony-laptop.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/drivers/platform/x86/sony-laptop.c
b/drivers/platform/x86/sony-laptop.c
index 13ec195..6b63329 100644
--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -145,7 +145,8 @@ static void sony_nc_thermal_resume(void);
#endif
static int sony_nc_kbd_backlight_setup(struct platform_device *pd,
unsigned int handle);
-static void sony_nc_kbd_backlight_cleanup(struct platform_device *pd);
+static void sony_nc_kbd_backlight_cleanup(struct platform_device *pd,
+ unsigned int handle);
static int sony_nc_battery_care_setup(struct platform_device *pd,
unsigned int handle);
@@ -1444,7 +1445,7 @@ static void sony_nc_function_cleanup(struct
platform_device *pd)
case 0x014b:
case 0x014c:
case 0x0163:
- sony_nc_kbd_backlight_cleanup(pd);
+ sony_nc_kbd_backlight_cleanup(pd, handle);
break;
default:
continue;
@@ -1825,6 +1826,12 @@ static int sony_nc_kbd_backlight_setup(struct
platform_device *pd,
int result;
int ret = 0;
+ if (kbdbl_ctl) {
+ pr_warn("handle 0x%.4x: keyboard backlight setup already done
for 0x%.4x\n",
+ handle, kbdbl_ctl->handle);
+ return -EBUSY;
+ }
+
/* verify the kbd backlight presence, these handles are not used for
* keyboard backlight only
*/
@@ -1884,9 +1891,10 @@ outkzalloc:
return ret;
}
-static void sony_nc_kbd_backlight_cleanup(struct platform_device *pd)
+static void sony_nc_kbd_backlight_cleanup(struct platform_device *pd,
+ unsigned int handle)
{
- if (kbdbl_ctl) {
+ if (kbdbl_ctl && handle == kbdbl_ctl->handle) {
device_remove_file(&pd->dev, &kbdbl_ctl->mode_attr);
device_remove_file(&pd->dev, &kbdbl_ctl->timeout_attr);
kfree(kbdbl_ctl);
--
1.8.4.rc3
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