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x86 platform drivers: hp-wmi fix buffer size depending on ACPI version

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Depending on ACPI version (1.0 -> 32 bit) an integer could be
32 or 64 bit long. _WED internal concatenates two integers and
the return value will be 8 byte (2* 32 bit) or 16 byte (2* 64 bit)
long, depending on the ACPI version.

Also the data send with the WMI event is defined to be splitted into:
  - Event ID -> 4 bytes
  - Event Data -> 4 bytes

This gets messed up with new ACPI versions.
But it's a HP BIOS bug that may get fixed in the future
-> Support both, 16 and 8 byte _WED buffers.

Also the wrong assumption that from the event data sent, only the
first byte is relevant got cleaned up that it fits event_id/event_data
as described above.

Signed-off-by: Thomas Renninger <trenn@suse.de>
CC: robert.moore@intel.com
Signed-off-by: Matthew Garrett <mjg@redhat.com>
CC: platform-driver-x86@vger.kernel.org
CC: linux-acpi@vger.kernel.org
This commit is contained in:
Thomas Renninger 2010-05-21 16:41:43 +02:00 committed by Matthew Garrett
parent 1bbdfd5961
commit 8dda6b0410
1 changed files with 27 additions and 7 deletions
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34
drivers/platform/x86/hp-wmi.c
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@ -352,7 +352,9 @@ static void hp_wmi_notify(u32 value, void *context)
struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
static struct key_entry *key;
union acpi_object *obj;
int eventcode, key_code;
u32 event_id, event_data;
int key_code;
u32 *location;
acpi_status status;
status = wmi_get_event_data(value, &response);
@ -363,15 +365,33 @@ static void hp_wmi_notify(u32 value, void *context)
obj = (union acpi_object *)response.pointer;
if (!obj || obj->type != ACPI_TYPE_BUFFER || obj->buffer.length != 8) {
printk(KERN_INFO PREFIX "Unknown response received\n");
if (obj || obj->type != ACPI_TYPE_BUFFER) {
printk(KERN_INFO "hp-wmi: Unknown response received %d\n",
obj->type);
kfree(obj);
return;
}
eventcode = *((u8 *) obj->buffer.pointer);
/*
* Depending on ACPI version the concatenation of id and event data
* inside _WED function will result in a 8 or 16 byte buffer.
*/
location = (u32 *)obj->buffer.pointer;
if (obj->buffer.length == 8) {
event_id = *location;
event_data = *(location + 1);
} else if (obj->buffer.length == 16) {
event_id = *location;
event_data = *(location + 2);
} else {
printk(KERN_INFO "hp-wmi: Unknown buffer length %d\n",
obj->buffer.length);
kfree(obj);
return;
}
kfree(obj);
switch (eventcode) {
switch (event_id) {
case HPWMI_DOCK_EVENT:
input_report_switch(hp_wmi_input_dev, SW_DOCK,
hp_wmi_dock_state());
@ -423,8 +443,8 @@ static void hp_wmi_notify(u32 value, void *context)
case HPWMI_LOCK_SWITCH:
break;
default:
printk(KERN_INFO PREFIX "Unknown eventcode - %d\n",
eventcode);
printk(KERN_INFO PREFIX "Unknown event_id - %d - 0x%x\n",
event_id, event_data);
break;
}
}