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

[Lan Tianyu <tianyu.lan-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

Thanks, len and Bob. You are right. You make my explain more clear.
于2012年05月09日 星期三 04时23分37秒,Len Brown写到:
> On 05/08/2012 04:52 AM, Lan Tianyu wrote:
>
>> Hi all:
>>
>> Following is the usb port descriptor in the DSDT of Thinkpad T410.
>> The port is attached with bluetooth on the board.
>
>
>>   Name (_UPC, Package (0x04) { 0xFF, 0xFF, 0x00, 0x00 })
>
>
> _UPC 1st byte says "connectable"
> _UPC 2nd byte says "proprietary connector"
>
>
>   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.
>
>
> According to the decoding from Bob Moore,
> bit 64 is not set, and thus this I/F is NOT user visible.
> Are we decoding this correctly?
>
>      81 6:0 = 1 (revision)
>           7 = 1 (ignore color)
>      00 15:8 (color red = 0)
>      00 23:16 (color green = 0)
>      00 31:24 (color blue = 0)
>      00 47:32 (width = 0)
>      00
>      00 63:48 (Height = 0)
>      00
>      30 64 (user visible = 0)
>         65 (dock = 0)
>         66 (lid = 0)
>         67:69 (Panel = b110 = 6 = unknown)
>         71:70 (vertical = 0 = upper)
>      1c 73:72 (horizontal = b00 = 0 = left)
>         77:74 (shape = b0111 = 7 = unknown)
>      00
>      00
>      00
>      00
>      00
>      00
>
>
> -Len
>
>
>>
>> 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
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