From patchwork Mon Jan 24 03:50:18 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alan Ott X-Patchwork-Id: 499931 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id p0O3obb9017228 for ; Mon, 24 Jan 2011 03:50:53 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753207Ab1AXDur (ORCPT ); Sun, 23 Jan 2011 22:50:47 -0500 Received: from core.signal11.us ([64.251.29.136]:34908 "EHLO core.signal11.us" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753019Ab1AXDug (ORCPT ); Sun, 23 Jan 2011 22:50:36 -0500 Received: from localhost (localhost.localdomain [127.0.0.1]) by core.signal11.us (Postfix) with SMTP id 9E9DE1CCABB8 for ; Sun, 23 Jan 2011 22:50:35 -0500 (EST) Received: from localhost.localdomain (c-68-59-135-75.hsd1.fl.comcast.net [68.59.135.75]) by core.signal11.us (Postfix) with ESMTP id E45011CCABB1; Sun, 23 Jan 2011 22:50:33 -0500 (EST) From: Alan Ott To: Randy Dunlap , Jiri Kosina , Alan Ott , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, greg@kroah.com, stern@rowland.harvard.edu Cc: Alan Ott Subject: [PATCH v4 1/1] hid: Add HID Report Descriptor to sysfs. Date: Sun, 23 Jan 2011 22:50:18 -0500 Message-Id: <1295841018-8561-2-git-send-email-alan@signal11.us> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <20110123225935.GB12488@kroah.com> References: <20110123225935.GB12488@kroah.com> X-DSPAM-Result: Whitelisted X-DSPAM-Processed: Sun Jan 23 22:50:35 2011 X-DSPAM-Confidence: 0.9899 X-DSPAM-Probability: 0.0000 X-DSPAM-Signature: 4d3cf70b35001663915037 Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter1.kernel.org [140.211.167.41]); Mon, 24 Jan 2011 03:50:53 +0000 (UTC) diff --git a/Documentation/ABI/testing/sysfs-driver-hid b/Documentation/ABI/testing/sysfs-driver-hid new file mode 100644 index 0000000..b6490e1 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-driver-hid @@ -0,0 +1,10 @@ +What: For USB devices : /sys/bus/usb/devices/-:./::./report_descriptor + For BT devices : /sys/class/bluetooth/hci/::./report_descriptor + Symlink : /sys/class/hidraw/hidraw/device/report_descriptor +Date: Jan 2011 +KernelVersion: 2.0.39 +Contact: Alan Ott +Description: When read, this file returns the device's raw binary HID + report descriptor. + This file cannot be written. +Users: HIDAPI library (http://www.signal11.us/oss/hidapi) diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index d678cf3..32bbd5d 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -1159,6 +1159,32 @@ static bool hid_hiddev(struct hid_device *hdev) return !!hid_match_id(hdev, hid_hiddev_list); } + +static ssize_t +read_report_descriptor(struct file *filp, struct kobject *kobj, + struct bin_attribute *attr, + char *buf, loff_t off, size_t count) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct hid_device *hdev = container_of(dev, struct hid_device, dev); + + if (off >= hdev->rsize) + return 0; + + if (off + count > hdev->rsize) + count = hdev->rsize - off; + + memcpy(buf, hdev->rdesc + off, count); + + return count; +} + +static struct bin_attribute dev_bin_attr_report_desc = { + .attr = { .name = "report_descriptor", .mode = 0444 }, + .read = read_report_descriptor, + .size = HID_MAX_DESCRIPTOR_SIZE, +}; + int hid_connect(struct hid_device *hdev, unsigned int connect_mask) { static const char *types[] = { "Device", "Pointer", "Mouse", "Device", @@ -1169,6 +1195,7 @@ int hid_connect(struct hid_device *hdev, unsigned int connect_mask) char buf[64]; unsigned int i; int len; + int ret; if (hdev->quirks & HID_QUIRK_HIDDEV_FORCE) connect_mask |= (HID_CONNECT_HIDDEV_FORCE | HID_CONNECT_HIDDEV); @@ -1230,6 +1257,11 @@ int hid_connect(struct hid_device *hdev, unsigned int connect_mask) bus = ""; } + ret = device_create_bin_file(&hdev->dev, &dev_bin_attr_report_desc); + if (ret) + hid_warn(hdev, + "can't create sysfs report descriptor attribute err: %d\n", ret); + hid_info(hdev, "%s: %s HID v%x.%02x %s [%s] on %s\n", buf, bus, hdev->version >> 8, hdev->version & 0xff, type, hdev->name, hdev->phys); @@ -1240,6 +1272,7 @@ EXPORT_SYMBOL_GPL(hid_connect); void hid_disconnect(struct hid_device *hdev) { + device_remove_bin_file(&hdev->dev, &dev_bin_attr_report_desc); if (hdev->claimed & HID_CLAIMED_INPUT) hidinput_disconnect(hdev); if (hdev->claimed & HID_CLAIMED_HIDDEV)