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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>
This commit is contained in:
Mattia Dongili 2013-10-30 08:07:36 +09:00 committed by Matthew Garrett
parent 2bd4ac1392
commit 1d885f4257
1 changed files with 12 additions and 4 deletions
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16
drivers/platform/x86/sony-laptop.c
View File

@ -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);