From mboxrd@z Thu Jan 1 00:00:00 1970 From: Forest Bond Subject: [PATCH] Input: usbtouchscreen - initialize eGalax devices Date: Fri, 31 Aug 2012 09:56:58 -0400 Message-ID: <20120831135658.GC24820@alittletooquiet.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from storm.alittletooquiet.net ([67.23.28.199]:50768 "EHLO storm.alittletooquiet.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753429Ab2HaOGu (ORCPT ); Fri, 31 Aug 2012 10:06:50 -0400 Content-Disposition: inline Sender: linux-input-owner@vger.kernel.org List-Id: linux-input@vger.kernel.org To: Dmitry Torokhov Cc: Daniel Ritz , linux-input@vger.kernel.org, linux-usb@vger.kernel.org From: Forest Bond Certain eGalax devices expose an interface with class HID and protocol None. Some work with usbhid and some work with usbtouchscreen, but there is no easy way to differentiate. Sending an eGalax diagnostic packet seems to kick them all into using the right protocol for usbtouchscreen, so we can continue to bind them all there (as opposed to handing some off to usbhid). This fixes a regression for devices that were claimed by (and worked with) usbhid prior to commit 139ebe8dc80dd74cb2ac9f5603d18fbf5cff049f, which made usbtouchscreen claim them instead. With this patch they will still be claimed by usbtouchscreen, but they will actually report events usbtouchscreen can understand. Note that these devices will be limited to the usbtouchscreen feature set so e.g. dual touch features are not supported. I have the distinct pleasure of needing to support devices of both types and have tested accordingly. Signed-off-by: Forest Bond --- drivers/input/touchscreen/usbtouchscreen.c | 25 +++++++++++++++++++++++++ 1 files changed, 25 insertions(+), 0 deletions(-) diff --git a/drivers/input/touchscreen/usbtouchscreen.c b/drivers/input/touchscreen/usbtouchscreen.c index e32709e..2ce5308 100644 --- a/drivers/input/touchscreen/usbtouchscreen.c +++ b/drivers/input/touchscreen/usbtouchscreen.c @@ -304,6 +304,30 @@ static int e2i_read_data(struct usbtouch_usb *dev, unsigned char *pkt) #define EGALAX_PKT_TYPE_REPT 0x80 #define EGALAX_PKT_TYPE_DIAG 0x0A +static int egalax_init(struct usbtouch_usb *usbtouch) +{ + int ret, i; + struct usb_device *udev = interface_to_usbdev(usbtouch->interface); + + /* An eGalax diagnostic packet kicks the device into using the right + * protocol. */ + for (i = 0; i < 3; i++) { + /* Send a "check active" packet. The response will be read + * later and ignored. */ + ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), + 0, + USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE, + 0, 0, "\x0A\x01A", 0, + USB_CTRL_SET_TIMEOUT); + if (ret >= 0) + break; + if (ret != -EPIPE) + return ret; + } + + return 0; +} + static int egalax_read_data(struct usbtouch_usb *dev, unsigned char *pkt) { if ((pkt[0] & EGALAX_PKT_TYPE_MASK) != EGALAX_PKT_TYPE_REPT) @@ -1056,6 +1080,7 @@ static struct usbtouch_device_info usbtouch_dev_info[] = { .process_pkt = usbtouch_process_multi, .get_pkt_len = egalax_get_pkt_len, .read_data = egalax_read_data, + .init = egalax_init, }, #endif -- 1.7.0.4