linux-kernel - [PATCH 2/2] pl2303: Match I330 phone more precisely

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Message-Id: <1429706890-29047-2-git-send-email-Jason@zx2c4.com>
Date:	Wed, 22 Apr 2015 14:48:10 +0200
From:	"Jason A. Donenfeld" <Jason@...c4.com>
To:	Johan Hovold <johan@...nel.org>, Petr Slansky <slansky@....net>,
	Adam C Powell IV <hazelsct@....edu>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	"Jason A. Donenfeld" <Jason@...c4.com>
Subject: [PATCH 2/2] pl2303: Match I330 phone more precisely

Samsung has just released a portable USB3 SSD, coming in a very small
and nice form factor. Its USB ID is 04e8:8001, which unfortunately is
already used by the pl2303 driver for the Samsung I330 phone cradle.
Having pl2303 pick up this device ID results in conflicts with the
usb-storage driver, which handles the newly released portable USB3 SSD.

To work around this conflict, I've dug up a mailing list post [1] from a
long time ago, in which a user posts the full USB descriptor
information. The most specific value in this appears to be the interface
class, which has value 255 (0xff). Since usb-storage requires an
interface class of 0x8, I believe it's correct to disambiguate the two
devices by matching on 0xff inside pl2303.

[1] http://permalink.gmane.org/gmane.linux.usb.user/4264

Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
---
 drivers/usb/serial/pl2303.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index 829604d..8bb929a 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -61,7 +61,7 @@ static const struct usb_device_id id_table[] = {
 	{ USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
 	{ USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
 	{ USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
-	{ USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
+	{ USB_DEVICE_INTERFACE_CLASS(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID, 0xff) },
 	{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1),
 		.driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
 	{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65),
-- 
2.3.5

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