Hi Alan ,
Thanx for the reply . The enclosed patch will definately help my cause .
In my case this is required as we want to stream digital audio from
ipod to our host .
i will definately need to provide quirk entries at run time ,
as at compile time , it will be extremely difficult to put quirk
entries for all the ipods .
there should be some registration mechanism in user space to specify
quirk entries at run time .
how we can specify quirk entries while the system is running ?
Thanx & Regards
Amit Nagal
On Tue, Jun 15, 2010 at 7:49 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:
> On Mon, 14 Jun 2010, Amit Nagal wrote:
>
>> Hi Alan ,
>>
>> Thanx for the reply .
>>
>> Following enclosed are logs :
>>
>> cat /proc/bus/usb/devices :
>>
>>
>> T: Bus=02 Lev=01 Prnt=01 Port=05 Cnt=01 Dev#= 2 Spd=480 MxCh= 0
>> D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 2
>> P: Vendor=05ac ProdID=1261 Rev= 0.01
>> S: Manufacturer=Apple Inc.
>> S: Product=iPod
>> S: SerialNumber=000A270013A06238
>> C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr=500mA
>> I:* If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
>> E: Ad=83(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
>> E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
>> C: #Ifs= 3 Cfg#= 2 Atr=c0 MxPwr=500mA
>> I: If#= 0 Alt= 0 #EPs= 0 Cls=01(audio) Sub=01 Prot=00 Driver=
>> I: If#= 1 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=
>> I: If#= 1 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=
>> E: Ad=81(I) Atr=01(Isoc) MxPS= 192 Ivl=1ms
>> I: If#= 2 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=00 Prot=00 Driver=
>> E: Ad=83(I) Atr=03(Int.) MxPS= 64 Ivl=125us
>
>> Looking forward to suggested patch .
>
> Here it is. However I must warn you: It is highly unlikely this patch
> will ever be accepted into the offical Linux kernel. Most people who
> have iPods and plug them into their computers do expect the iPod to be
> placed in the mass-storage config.
>
> About the closest we might come is a change allowing you to specify
> quirk entries while the system is running.
>
> Alan Stern
>
>
>
> Index: 2.6.34/drivers/usb/core/generic.c
> ===================================================================
> --- 2.6.34.orig/drivers/usb/core/generic.c
> +++ 2.6.34/drivers/usb/core/generic.c
> @@ -18,6 +18,7 @@
> */
>
> #include <linux/usb.h>
> +#include <linux/usb/quirks.h>
> #include "usb.h"
> #include "hcd.h"
>
> @@ -47,6 +48,9 @@ int usb_choose_configuration(struct usb_
> int insufficient_power = 0;
> struct usb_host_config *c, *best;
>
> + if (udev->quirks & USB_QUIRK_DONT_CONFIGURE)
> + return -1;
> +
> best = NULL;
> c = udev->config;
> num_configs = udev->descriptor.bNumConfigurations;
> Index: 2.6.34/drivers/usb/core/quirks.c
> ===================================================================
> --- 2.6.34.orig/drivers/usb/core/quirks.c
> +++ 2.6.34/drivers/usb/core/quirks.c
> @@ -50,6 +50,9 @@ static const struct usb_device_id usb_qu
> /* appletouch */
> { USB_DEVICE(0x05ac, 0x021a), .driver_info = USB_QUIRK_RESET_RESUME },
>
> + /* Apple iPod */
> + { USB_DEVICE(0x05ac, 0x1261), .driver_info = USB_QUIRK_DONT_CONFIGURE },
> +
> /* Avision AV600U */
> { USB_DEVICE(0x0638, 0x0a13), .driver_info =
> USB_QUIRK_STRING_FETCH_255 },
> Index: 2.6.34/include/linux/usb/quirks.h
> ===================================================================
> --- 2.6.34.orig/include/linux/usb/quirks.h
> +++ 2.6.34/include/linux/usb/quirks.h
> @@ -22,4 +22,7 @@
> /*device will morph if reset, don't use reset for handling errors */
> #define USB_QUIRK_RESET_MORPHS 0x00000010
>
> +/* device should not be configured by default */
> +#define USB_QUIRK_DONT_CONFIGURE 0x00000020
> +
> #endif /* __LINUX_USB_QUIRKS_H */
>
>
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