diff options
| author | Mattia Dongili <malattia@linux.it> | 2013-10-30 08:07:36 +0900 |
|---|---|---|
| committer | Matthew Garrett <matthew.garrett@nebula.com> | 2013-11-20 18:50:49 -0500 |
| commit | 1d885f4257165563342acc6bc473b67d9b36a742 (patch) | |
| tree | b8f837819a0fafdad9fe3bdaea052ef5798f5008 /drivers/platform | |
| parent | 2bd4ac139259bb605fc0325a7dda33e2fbb67ae3 (diff) | |
| download | linux-1d885f4257165563342acc6bc473b67d9b36a742.tar.bz2 | |
sony-laptop: warn on multiple KBD backlight handles
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 <krgsch@gmail.com>
Signed-off-by: Mattia Dongili <malattia@linux.it>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
Diffstat (limited to 'drivers/platform')
| -rw-r--r-- | drivers/platform/x86/sony-laptop.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c index 47caab0ea7a1..03f02cc476e5 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; @@ -1822,6 +1823,12 @@ 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 */ @@ -1881,9 +1888,10 @@ 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); |