Re: [Resend PATCH V2 3/7] usb: Set device removable state based on ACPI USB data

[Lan Tianyu <tianyu.lan@intel.com>]

Hi all:

Following is the usb port descriptor in the DSDT of Thinkpad T410.
The port is attached with bluetooth on the board.

                       Device (PRTB)
                        {     
                            Name (_ADR, 0x04) 
                            Name (_UPC, Package (0x04)
                            {     
                                0xFF, 
                                0xFF, 
                                0x00, 
                                0x00  
                            })    
                            Name (_PLD, Buffer (0x10)
                            {     
                                /* 0000 */    0x81, 0x00, 0x00, 0x00, 
0x00, 0x00, 0x00, 0x00,
                                /* 0008 */    0x30, 0x1C, 0x00, 0x00, 
0x00, 0x00, 0x00, 0x00
                            })    
                        }
_PLD buffer show the device internal port.     
Bit 64 – User Visible: Set if the device connection point can be seen 
by the user without disassembly.

于2012年05月08日 星期二 10时58分17秒,Matthew Garrett写到:
> On Mon, May 07, 2012 at 09:57:44AM -0700, Greg KH wrote:
>> On Mon, May 07, 2012 at 09:38:15AM +0800, Lan Tianyu wrote:
>>> This depends on the bios. From my opinion, the bluetooth is device on the
>>> motherboard so it belongs to hard-wired type.
>>
>> That's nice, but it's not what is happening in lots of different laptops
>> out there today.
>>
>> Oliver is right, how does this handle bluetooth USB controllers that are
>> turned on/off from magic function-key presses?
>
> I /believe/ that such devices will be indicated as fixed rather than
> removable. The variable indicates the physical state rather than the
> logical one - fixed doesn't mean that a device will never go away, it
> means that a user can't physically unplug it.
>



-- 
Best Regards
Tianyu Lan
linux kernel enabling team
--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html