From mboxrd@z Thu Jan 1 00:00:00 1970 From: oliver@neukum.org Subject: [PATCH] hid-elo: some systems cannot stomach work around Date: Wed, 25 Sep 2013 09:42:55 +0200 Message-ID: <1380094975-4481-1-git-send-email-oliver@neukum.org> Return-path: Received: from smtp-out003.kontent.com ([81.88.40.217]:33782 "EHLO smtp-out003.kontent.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750774Ab3IYHnB (ORCPT ); Wed, 25 Sep 2013 03:43:01 -0400 Sender: linux-input-owner@vger.kernel.org List-Id: linux-input@vger.kernel.org To: linux-usb@vger.kernel.org, linux-input@vger.kernel.org, jkosina@suse.cz, jslaby@suse.cz Cc: Oliver Neukum From: Oliver Neukum Some systems although they have firmware class 'M', which usually needs a work around to not crash, must not be subjected to the work around because the work around crashes them. They cannot be told apart by their own device descriptor, but as they are part of compound devices, can be identified by looking at their siblings. V2: fixed formatting Signed-off-by: Oliver Neukum --- drivers/hid/hid-elo.c | 35 ++++++++++++++++++++++++++++++++++- 1 file changed, 34 insertions(+), 1 deletion(-) diff --git a/drivers/hid/hid-elo.c b/drivers/hid/hid-elo.c index f042a6c..4e49462 100644 --- a/drivers/hid/hid-elo.c +++ b/drivers/hid/hid-elo.c @@ -181,7 +181,40 @@ fail: */ static bool elo_broken_firmware(struct usb_device *dev) { - return use_fw_quirk && le16_to_cpu(dev->descriptor.bcdDevice) == 0x10d; + struct usb_device *hub = dev->parent; + struct usb_device *child = NULL; + u16 fw_lvl = le16_to_cpu(dev->descriptor.bcdDevice); + u16 child_vid, child_pid; + int i; + + if (!use_fw_quirk) + return false; + if (fw_lvl != 0x10d) + return false; + + /* iterate sibling devices of the touch controller */ + usb_hub_for_each_child(hub, i, child) { + child_vid = le16_to_cpu(child->descriptor.idVendor); + child_pid = le16_to_cpu(child->descriptor.idProduct); + + /* + * If one of the devices below is present attached as a sibling of + * the touch controller then this is a newer IBM 4820 monitor that + * does not need the IBM-requested workaround if fw level is + * 0x010d - aka 'M'. + * No other HW can have this combination. + */ + if (child_vid==0x04b3) { + switch (child_pid) { + case 0x4676: /* 4820 21x Video */ + case 0x4677: /* 4820 51x Video */ + case 0x4678: /* 4820 2Lx Video */ + case 0x4679: /* 4820 5Lx Video */ + return false; + } + } + } + return true; } static int elo_probe(struct hid_device *hdev, const struct hid_device_id *id) -- 1.8.3.1