![Ming Lei](/assets/img/avatar_default.png)
There is no reason to hold hiddev->existancelock before calling usb_deregister_dev, so move it out of the lock. The patch fixes the lockdep warning below. [ 5733.386271] ====================================================== [ 5733.386274] [ INFO: possible circular locking dependency detected ] [ 5733.386278] 3.2.0-custom-next-20120111+ #1 Not tainted [ 5733.386281] ------------------------------------------------------- [ 5733.386284] khubd/186 is trying to acquire lock: [ 5733.386288] (minor_rwsem){++++.+}, at: [<ffffffffa0011a04>] usb_deregister_dev+0x37/0x9e [usbcore] [ 5733.386311] [ 5733.386312] but task is already holding lock: [ 5733.386315] (&hiddev->existancelock){+.+...}, at: [<ffffffffa0094d17>] hiddev_disconnect+0x26/0x87 [usbhid] [ 5733.386328] [ 5733.386329] which lock already depends on the new lock. [ 5733.386330] [ 5733.386333] [ 5733.386334] the existing dependency chain (in reverse order) is: [ 5733.386336] [ 5733.386337] -> #1 (&hiddev->existancelock){+.+...}: [ 5733.386346] [<ffffffff81082d26>] lock_acquire+0xcb/0x10e [ 5733.386357] [<ffffffff813df961>] __mutex_lock_common+0x60/0x465 [ 5733.386366] [<ffffffff813dfe4d>] mutex_lock_nested+0x36/0x3b [ 5733.386371] [<ffffffffa0094ad6>] hiddev_open+0x113/0x193 [usbhid] [ 5733.386378] [<ffffffffa0011971>] usb_open+0x66/0xc2 [usbcore] [ 5733.386390] [<ffffffff8111a8b5>] chrdev_open+0x12b/0x154 [ 5733.386402] [<ffffffff811159a8>] __dentry_open.isra.16+0x20b/0x355 [ 5733.386408] [<ffffffff811165dc>] nameidata_to_filp+0x43/0x4a [ 5733.386413] [<ffffffff81122ed5>] do_last+0x536/0x570 [ 5733.386419] [<ffffffff8112300b>] path_openat+0xce/0x301 [ 5733.386423] [<ffffffff81123327>] do_filp_open+0x33/0x81 [ 5733.386427] [<ffffffff8111664d>] do_sys_open+0x6a/0xfc [ 5733.386431] [<ffffffff811166fb>] sys_open+0x1c/0x1e [ 5733.386434] [<ffffffff813e7c79>] system_call_fastpath+0x16/0x1b [ 5733.386441] [ 5733.386441] -> #0 (minor_rwsem){++++.+}: [ 5733.386448] [<ffffffff8108255d>] __lock_acquire+0xa80/0xd74 [ 5733.386454] [<ffffffff81082d26>] lock_acquire+0xcb/0x10e [ 5733.386458] [<ffffffff813e01f5>] down_write+0x44/0x77 [ 5733.386464] [<ffffffffa0011a04>] usb_deregister_dev+0x37/0x9e [usbcore] [ 5733.386475] [<ffffffffa0094d2d>] hiddev_disconnect+0x3c/0x87 [usbhid] [ 5733.386483] [<ffffffff8132df51>] hid_disconnect+0x3f/0x54 [ 5733.386491] [<ffffffff8132dfb4>] hid_device_remove+0x4e/0x7a [ 5733.386496] [<ffffffff812c0957>] __device_release_driver+0x81/0xcd [ 5733.386502] [<ffffffff812c09c3>] device_release_driver+0x20/0x2d [ 5733.386507] [<ffffffff812c0564>] bus_remove_device+0x114/0x128 [ 5733.386512] [<ffffffff812bdd6f>] device_del+0x131/0x183 [ 5733.386519] [<ffffffff8132def3>] hid_destroy_device+0x1e/0x3d [ 5733.386525] [<ffffffffa00916b0>] usbhid_disconnect+0x36/0x42 [usbhid] [ 5733.386530] [<ffffffffa000fb60>] usb_unbind_interface+0x57/0x11f [usbcore] [ 5733.386542] [<ffffffff812c0957>] __device_release_driver+0x81/0xcd [ 5733.386547] [<ffffffff812c09c3>] device_release_driver+0x20/0x2d [ 5733.386552] [<ffffffff812c0564>] bus_remove_device+0x114/0x128 [ 5733.386557] [<ffffffff812bdd6f>] device_del+0x131/0x183 [ 5733.386562] [<ffffffffa000de61>] usb_disable_device+0xa8/0x1d8 [usbcore] [ 5733.386573] [<ffffffffa0006bd2>] usb_disconnect+0xab/0x11f [usbcore] [ 5733.386583] [<ffffffffa0008aa0>] hub_thread+0x73b/0x1157 [usbcore] [ 5733.386593] [<ffffffff8105dc0f>] kthread+0x95/0x9d [ 5733.386601] [<ffffffff813e90b4>] kernel_thread_helper+0x4/0x10 [ 5733.386607] [ 5733.386608] other info that might help us debug this: [ 5733.386609] [ 5733.386612] Possible unsafe locking scenario: [ 5733.386613] [ 5733.386615] CPU0 CPU1 [ 5733.386618] ---- ---- [ 5733.386620] lock(&hiddev->existancelock); [ 5733.386625] lock(minor_rwsem); [ 5733.386630] lock(&hiddev->existancelock); [ 5733.386635] lock(minor_rwsem); [ 5733.386639] [ 5733.386640] *** DEADLOCK *** [ 5733.386641] [ 5733.386644] 6 locks held by khubd/186: [ 5733.386646] #0: (&__lockdep_no_validate__){......}, at: [<ffffffffa00084af>] hub_thread+0x14a/0x1157 [usbcore] [ 5733.386661] #1: (&__lockdep_no_validate__){......}, at: [<ffffffffa0006b77>] usb_disconnect+0x50/0x11f [usbcore] [ 5733.386677] #2: (hcd->bandwidth_mutex){+.+.+.}, at: [<ffffffffa0006bc8>] usb_disconnect+0xa1/0x11f [usbcore] [ 5733.386693] #3: (&__lockdep_no_validate__){......}, at: [<ffffffff812c09bb>] device_release_driver+0x18/0x2d [ 5733.386704] #4: (&__lockdep_no_validate__){......}, at: [<ffffffff812c09bb>] device_release_driver+0x18/0x2d [ 5733.386714] #5: (&hiddev->existancelock){+.+...}, at: [<ffffffffa0094d17>] hiddev_disconnect+0x26/0x87 [usbhid] [ 5733.386727] [ 5733.386727] stack backtrace: [ 5733.386731] Pid: 186, comm: khubd Not tainted 3.2.0-custom-next-20120111+ #1 [ 5733.386734] Call Trace: [ 5733.386741] [<ffffffff81062881>] ? up+0x34/0x3b [ 5733.386747] [<ffffffff813d9ef3>] print_circular_bug+0x1f8/0x209 [ 5733.386752] [<ffffffff8108255d>] __lock_acquire+0xa80/0xd74 [ 5733.386756] [<ffffffff810808b4>] ? trace_hardirqs_on_caller+0x15d/0x1a3 [ 5733.386763] [<ffffffff81043a3f>] ? vprintk+0x3f4/0x419 [ 5733.386774] [<ffffffffa0011a04>] ? usb_deregister_dev+0x37/0x9e [usbcore] [ 5733.386779] [<ffffffff81082d26>] lock_acquire+0xcb/0x10e [ 5733.386789] [<ffffffffa0011a04>] ? usb_deregister_dev+0x37/0x9e [usbcore] [ 5733.386797] [<ffffffff813e01f5>] down_write+0x44/0x77 [ 5733.386807] [<ffffffffa0011a04>] ? usb_deregister_dev+0x37/0x9e [usbcore] [ 5733.386818] [<ffffffffa0011a04>] usb_deregister_dev+0x37/0x9e [usbcore] [ 5733.386825] [<ffffffffa0094d2d>] hiddev_disconnect+0x3c/0x87 [usbhid] [ 5733.386830] [<ffffffff8132df51>] hid_disconnect+0x3f/0x54 [ 5733.386834] [<ffffffff8132dfb4>] hid_device_remove+0x4e/0x7a [ 5733.386839] [<ffffffff812c0957>] __device_release_driver+0x81/0xcd [ 5733.386844] [<ffffffff812c09c3>] device_release_driver+0x20/0x2d [ 5733.386848] [<ffffffff812c0564>] bus_remove_device+0x114/0x128 [ 5733.386854] [<ffffffff812bdd6f>] device_del+0x131/0x183 [ 5733.386859] [<ffffffff8132def3>] hid_destroy_device+0x1e/0x3d [ 5733.386865] [<ffffffffa00916b0>] usbhid_disconnect+0x36/0x42 [usbhid] [ 5733.386876] [<ffffffffa000fb60>] usb_unbind_interface+0x57/0x11f [usbcore] [ 5733.386882] [<ffffffff812c0957>] __device_release_driver+0x81/0xcd [ 5733.386886] [<ffffffff812c09c3>] device_release_driver+0x20/0x2d [ 5733.386890] [<ffffffff812c0564>] bus_remove_device+0x114/0x128 [ 5733.386895] [<ffffffff812bdd6f>] device_del+0x131/0x183 [ 5733.386905] [<ffffffffa000de61>] usb_disable_device+0xa8/0x1d8 [usbcore] [ 5733.386916] [<ffffffffa0006bd2>] usb_disconnect+0xab/0x11f [usbcore] [ 5733.386921] [<ffffffff813dff82>] ? __mutex_unlock_slowpath+0x130/0x141 [ 5733.386929] [<ffffffffa0008aa0>] hub_thread+0x73b/0x1157 [usbcore] [ 5733.386935] [<ffffffff8106a51d>] ? finish_task_switch+0x78/0x150 [ 5733.386941] [<ffffffff8105e396>] ? __init_waitqueue_head+0x4c/0x4c [ 5733.386950] [<ffffffffa0008365>] ? usb_remote_wakeup+0x56/0x56 [usbcore] [ 5733.386955] [<ffffffff8105dc0f>] kthread+0x95/0x9d [ 5733.386961] [<ffffffff813e90b4>] kernel_thread_helper+0x4/0x10 [ 5733.386966] [<ffffffff813e24b8>] ? retint_restore_args+0x13/0x13 [ 5733.386970] [<ffffffff8105db7a>] ? __init_kthread_worker+0x55/0x55 [ 5733.386974] [<ffffffff813e90b0>] ? gs_change+0x13/0x13 Signed-off-by: Ming Lei <ming.lei@canonical.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
939 lines
22 KiB
C
939 lines
22 KiB
C
/*
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* Copyright (c) 2001 Paul Stewart
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* Copyright (c) 2001 Vojtech Pavlik
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*
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* HID char devices, giving access to raw HID device events.
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*
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*/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Should you need to contact me, the author, you can do so either by
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* e-mail - mail your message to Paul Stewart <stewart@wetlogic.net>
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*/
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#include <linux/poll.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/input.h>
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#include <linux/usb.h>
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#include <linux/hid.h>
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#include <linux/hiddev.h>
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#include <linux/compat.h>
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#include "usbhid.h"
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#ifdef CONFIG_USB_DYNAMIC_MINORS
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#define HIDDEV_MINOR_BASE 0
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#define HIDDEV_MINORS 256
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#else
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#define HIDDEV_MINOR_BASE 96
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#define HIDDEV_MINORS 16
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#endif
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#define HIDDEV_BUFFER_SIZE 2048
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struct hiddev {
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int exist;
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int open;
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struct mutex existancelock;
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wait_queue_head_t wait;
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struct hid_device *hid;
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struct list_head list;
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spinlock_t list_lock;
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};
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struct hiddev_list {
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struct hiddev_usage_ref buffer[HIDDEV_BUFFER_SIZE];
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int head;
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int tail;
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unsigned flags;
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struct fasync_struct *fasync;
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struct hiddev *hiddev;
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struct list_head node;
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struct mutex thread_lock;
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};
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/*
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* Find a report, given the report's type and ID. The ID can be specified
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* indirectly by REPORT_ID_FIRST (which returns the first report of the given
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* type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the
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* given type which follows old_id.
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*/
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static struct hid_report *
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hiddev_lookup_report(struct hid_device *hid, struct hiddev_report_info *rinfo)
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{
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unsigned int flags = rinfo->report_id & ~HID_REPORT_ID_MASK;
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unsigned int rid = rinfo->report_id & HID_REPORT_ID_MASK;
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struct hid_report_enum *report_enum;
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struct hid_report *report;
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struct list_head *list;
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if (rinfo->report_type < HID_REPORT_TYPE_MIN ||
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rinfo->report_type > HID_REPORT_TYPE_MAX)
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return NULL;
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report_enum = hid->report_enum +
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(rinfo->report_type - HID_REPORT_TYPE_MIN);
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switch (flags) {
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case 0: /* Nothing to do -- report_id is already set correctly */
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break;
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case HID_REPORT_ID_FIRST:
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if (list_empty(&report_enum->report_list))
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return NULL;
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list = report_enum->report_list.next;
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report = list_entry(list, struct hid_report, list);
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rinfo->report_id = report->id;
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break;
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case HID_REPORT_ID_NEXT:
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report = report_enum->report_id_hash[rid];
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if (!report)
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return NULL;
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list = report->list.next;
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if (list == &report_enum->report_list)
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return NULL;
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report = list_entry(list, struct hid_report, list);
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rinfo->report_id = report->id;
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break;
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default:
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return NULL;
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}
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return report_enum->report_id_hash[rinfo->report_id];
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}
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/*
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* Perform an exhaustive search of the report table for a usage, given its
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* type and usage id.
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*/
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static struct hid_field *
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hiddev_lookup_usage(struct hid_device *hid, struct hiddev_usage_ref *uref)
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{
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int i, j;
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struct hid_report *report;
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struct hid_report_enum *report_enum;
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struct hid_field *field;
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if (uref->report_type < HID_REPORT_TYPE_MIN ||
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uref->report_type > HID_REPORT_TYPE_MAX)
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return NULL;
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report_enum = hid->report_enum +
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(uref->report_type - HID_REPORT_TYPE_MIN);
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list_for_each_entry(report, &report_enum->report_list, list) {
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for (i = 0; i < report->maxfield; i++) {
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field = report->field[i];
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for (j = 0; j < field->maxusage; j++) {
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if (field->usage[j].hid == uref->usage_code) {
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uref->report_id = report->id;
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uref->field_index = i;
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uref->usage_index = j;
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return field;
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}
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}
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}
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}
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return NULL;
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}
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static void hiddev_send_event(struct hid_device *hid,
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struct hiddev_usage_ref *uref)
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{
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struct hiddev *hiddev = hid->hiddev;
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struct hiddev_list *list;
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unsigned long flags;
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spin_lock_irqsave(&hiddev->list_lock, flags);
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list_for_each_entry(list, &hiddev->list, node) {
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if (uref->field_index != HID_FIELD_INDEX_NONE ||
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(list->flags & HIDDEV_FLAG_REPORT) != 0) {
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list->buffer[list->head] = *uref;
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list->head = (list->head + 1) &
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(HIDDEV_BUFFER_SIZE - 1);
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kill_fasync(&list->fasync, SIGIO, POLL_IN);
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}
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}
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spin_unlock_irqrestore(&hiddev->list_lock, flags);
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wake_up_interruptible(&hiddev->wait);
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}
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/*
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* This is where hid.c calls into hiddev to pass an event that occurred over
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* the interrupt pipe
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*/
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void hiddev_hid_event(struct hid_device *hid, struct hid_field *field,
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struct hid_usage *usage, __s32 value)
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{
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unsigned type = field->report_type;
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struct hiddev_usage_ref uref;
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uref.report_type =
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(type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT :
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((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT :
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((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0));
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uref.report_id = field->report->id;
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uref.field_index = field->index;
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uref.usage_index = (usage - field->usage);
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uref.usage_code = usage->hid;
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uref.value = value;
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hiddev_send_event(hid, &uref);
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}
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EXPORT_SYMBOL_GPL(hiddev_hid_event);
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void hiddev_report_event(struct hid_device *hid, struct hid_report *report)
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{
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unsigned type = report->type;
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struct hiddev_usage_ref uref;
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memset(&uref, 0, sizeof(uref));
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uref.report_type =
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(type == HID_INPUT_REPORT) ? HID_REPORT_TYPE_INPUT :
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((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT :
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((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE : 0));
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uref.report_id = report->id;
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uref.field_index = HID_FIELD_INDEX_NONE;
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hiddev_send_event(hid, &uref);
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}
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/*
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* fasync file op
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*/
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static int hiddev_fasync(int fd, struct file *file, int on)
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{
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struct hiddev_list *list = file->private_data;
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return fasync_helper(fd, file, on, &list->fasync);
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}
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/*
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* release file op
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*/
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static int hiddev_release(struct inode * inode, struct file * file)
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{
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struct hiddev_list *list = file->private_data;
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unsigned long flags;
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spin_lock_irqsave(&list->hiddev->list_lock, flags);
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list_del(&list->node);
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spin_unlock_irqrestore(&list->hiddev->list_lock, flags);
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mutex_lock(&list->hiddev->existancelock);
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if (!--list->hiddev->open) {
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if (list->hiddev->exist) {
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usbhid_close(list->hiddev->hid);
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usbhid_put_power(list->hiddev->hid);
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} else {
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mutex_unlock(&list->hiddev->existancelock);
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kfree(list->hiddev);
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kfree(list);
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return 0;
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}
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}
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mutex_unlock(&list->hiddev->existancelock);
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kfree(list);
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return 0;
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}
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/*
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* open file op
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*/
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static int hiddev_open(struct inode *inode, struct file *file)
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{
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struct hiddev_list *list;
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struct usb_interface *intf;
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struct hid_device *hid;
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struct hiddev *hiddev;
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int res;
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intf = usbhid_find_interface(iminor(inode));
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if (!intf)
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return -ENODEV;
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hid = usb_get_intfdata(intf);
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hiddev = hid->hiddev;
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if (!(list = kzalloc(sizeof(struct hiddev_list), GFP_KERNEL)))
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return -ENOMEM;
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mutex_init(&list->thread_lock);
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list->hiddev = hiddev;
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file->private_data = list;
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/*
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* no need for locking because the USB major number
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* is shared which usbcore guards against disconnect
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*/
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if (list->hiddev->exist) {
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if (!list->hiddev->open++) {
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res = usbhid_open(hiddev->hid);
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if (res < 0) {
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res = -EIO;
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goto bail;
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}
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}
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} else {
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res = -ENODEV;
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goto bail;
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}
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spin_lock_irq(&list->hiddev->list_lock);
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list_add_tail(&list->node, &hiddev->list);
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spin_unlock_irq(&list->hiddev->list_lock);
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mutex_lock(&hiddev->existancelock);
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if (!list->hiddev->open++)
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if (list->hiddev->exist) {
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struct hid_device *hid = hiddev->hid;
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res = usbhid_get_power(hid);
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if (res < 0) {
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res = -EIO;
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goto bail_unlock;
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}
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usbhid_open(hid);
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}
|
|
mutex_unlock(&hiddev->existancelock);
|
|
return 0;
|
|
bail_unlock:
|
|
mutex_unlock(&hiddev->existancelock);
|
|
bail:
|
|
file->private_data = NULL;
|
|
kfree(list);
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* "write" file op
|
|
*/
|
|
static ssize_t hiddev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* "read" file op
|
|
*/
|
|
static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
struct hiddev_list *list = file->private_data;
|
|
int event_size;
|
|
int retval;
|
|
|
|
event_size = ((list->flags & HIDDEV_FLAG_UREF) != 0) ?
|
|
sizeof(struct hiddev_usage_ref) : sizeof(struct hiddev_event);
|
|
|
|
if (count < event_size)
|
|
return 0;
|
|
|
|
/* lock against other threads */
|
|
retval = mutex_lock_interruptible(&list->thread_lock);
|
|
if (retval)
|
|
return -ERESTARTSYS;
|
|
|
|
while (retval == 0) {
|
|
if (list->head == list->tail) {
|
|
prepare_to_wait(&list->hiddev->wait, &wait, TASK_INTERRUPTIBLE);
|
|
|
|
while (list->head == list->tail) {
|
|
if (file->f_flags & O_NONBLOCK) {
|
|
retval = -EAGAIN;
|
|
break;
|
|
}
|
|
if (signal_pending(current)) {
|
|
retval = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
if (!list->hiddev->exist) {
|
|
retval = -EIO;
|
|
break;
|
|
}
|
|
|
|
/* let O_NONBLOCK tasks run */
|
|
mutex_unlock(&list->thread_lock);
|
|
schedule();
|
|
if (mutex_lock_interruptible(&list->thread_lock)) {
|
|
finish_wait(&list->hiddev->wait, &wait);
|
|
return -EINTR;
|
|
}
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
}
|
|
finish_wait(&list->hiddev->wait, &wait);
|
|
|
|
}
|
|
|
|
if (retval) {
|
|
mutex_unlock(&list->thread_lock);
|
|
return retval;
|
|
}
|
|
|
|
|
|
while (list->head != list->tail &&
|
|
retval + event_size <= count) {
|
|
if ((list->flags & HIDDEV_FLAG_UREF) == 0) {
|
|
if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE) {
|
|
struct hiddev_event event;
|
|
|
|
event.hid = list->buffer[list->tail].usage_code;
|
|
event.value = list->buffer[list->tail].value;
|
|
if (copy_to_user(buffer + retval, &event, sizeof(struct hiddev_event))) {
|
|
mutex_unlock(&list->thread_lock);
|
|
return -EFAULT;
|
|
}
|
|
retval += sizeof(struct hiddev_event);
|
|
}
|
|
} else {
|
|
if (list->buffer[list->tail].field_index != HID_FIELD_INDEX_NONE ||
|
|
(list->flags & HIDDEV_FLAG_REPORT) != 0) {
|
|
|
|
if (copy_to_user(buffer + retval, list->buffer + list->tail, sizeof(struct hiddev_usage_ref))) {
|
|
mutex_unlock(&list->thread_lock);
|
|
return -EFAULT;
|
|
}
|
|
retval += sizeof(struct hiddev_usage_ref);
|
|
}
|
|
}
|
|
list->tail = (list->tail + 1) & (HIDDEV_BUFFER_SIZE - 1);
|
|
}
|
|
|
|
}
|
|
mutex_unlock(&list->thread_lock);
|
|
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* "poll" file op
|
|
* No kernel lock - fine
|
|
*/
|
|
static unsigned int hiddev_poll(struct file *file, poll_table *wait)
|
|
{
|
|
struct hiddev_list *list = file->private_data;
|
|
|
|
poll_wait(file, &list->hiddev->wait, wait);
|
|
if (list->head != list->tail)
|
|
return POLLIN | POLLRDNORM;
|
|
if (!list->hiddev->exist)
|
|
return POLLERR | POLLHUP;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* "ioctl" file op
|
|
*/
|
|
static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg)
|
|
{
|
|
struct hid_device *hid = hiddev->hid;
|
|
struct hiddev_report_info rinfo;
|
|
struct hiddev_usage_ref_multi *uref_multi = NULL;
|
|
struct hiddev_usage_ref *uref;
|
|
struct hid_report *report;
|
|
struct hid_field *field;
|
|
int i;
|
|
|
|
uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL);
|
|
if (!uref_multi)
|
|
return -ENOMEM;
|
|
uref = &uref_multi->uref;
|
|
if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) {
|
|
if (copy_from_user(uref_multi, user_arg,
|
|
sizeof(*uref_multi)))
|
|
goto fault;
|
|
} else {
|
|
if (copy_from_user(uref, user_arg, sizeof(*uref)))
|
|
goto fault;
|
|
}
|
|
|
|
switch (cmd) {
|
|
case HIDIOCGUCODE:
|
|
rinfo.report_type = uref->report_type;
|
|
rinfo.report_id = uref->report_id;
|
|
if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
|
|
goto inval;
|
|
|
|
if (uref->field_index >= report->maxfield)
|
|
goto inval;
|
|
|
|
field = report->field[uref->field_index];
|
|
if (uref->usage_index >= field->maxusage)
|
|
goto inval;
|
|
|
|
uref->usage_code = field->usage[uref->usage_index].hid;
|
|
|
|
if (copy_to_user(user_arg, uref, sizeof(*uref)))
|
|
goto fault;
|
|
|
|
goto goodreturn;
|
|
|
|
default:
|
|
if (cmd != HIDIOCGUSAGE &&
|
|
cmd != HIDIOCGUSAGES &&
|
|
uref->report_type == HID_REPORT_TYPE_INPUT)
|
|
goto inval;
|
|
|
|
if (uref->report_id == HID_REPORT_ID_UNKNOWN) {
|
|
field = hiddev_lookup_usage(hid, uref);
|
|
if (field == NULL)
|
|
goto inval;
|
|
} else {
|
|
rinfo.report_type = uref->report_type;
|
|
rinfo.report_id = uref->report_id;
|
|
if ((report = hiddev_lookup_report(hid, &rinfo)) == NULL)
|
|
goto inval;
|
|
|
|
if (uref->field_index >= report->maxfield)
|
|
goto inval;
|
|
|
|
field = report->field[uref->field_index];
|
|
|
|
if (cmd == HIDIOCGCOLLECTIONINDEX) {
|
|
if (uref->usage_index >= field->maxusage)
|
|
goto inval;
|
|
} else if (uref->usage_index >= field->report_count)
|
|
goto inval;
|
|
|
|
else if ((cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) &&
|
|
(uref_multi->num_values > HID_MAX_MULTI_USAGES ||
|
|
uref->usage_index + uref_multi->num_values > field->report_count))
|
|
goto inval;
|
|
}
|
|
|
|
switch (cmd) {
|
|
case HIDIOCGUSAGE:
|
|
uref->value = field->value[uref->usage_index];
|
|
if (copy_to_user(user_arg, uref, sizeof(*uref)))
|
|
goto fault;
|
|
goto goodreturn;
|
|
|
|
case HIDIOCSUSAGE:
|
|
field->value[uref->usage_index] = uref->value;
|
|
goto goodreturn;
|
|
|
|
case HIDIOCGCOLLECTIONINDEX:
|
|
i = field->usage[uref->usage_index].collection_index;
|
|
kfree(uref_multi);
|
|
return i;
|
|
case HIDIOCGUSAGES:
|
|
for (i = 0; i < uref_multi->num_values; i++)
|
|
uref_multi->values[i] =
|
|
field->value[uref->usage_index + i];
|
|
if (copy_to_user(user_arg, uref_multi,
|
|
sizeof(*uref_multi)))
|
|
goto fault;
|
|
goto goodreturn;
|
|
case HIDIOCSUSAGES:
|
|
for (i = 0; i < uref_multi->num_values; i++)
|
|
field->value[uref->usage_index + i] =
|
|
uref_multi->values[i];
|
|
goto goodreturn;
|
|
}
|
|
|
|
goodreturn:
|
|
kfree(uref_multi);
|
|
return 0;
|
|
fault:
|
|
kfree(uref_multi);
|
|
return -EFAULT;
|
|
inval:
|
|
kfree(uref_multi);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg)
|
|
{
|
|
struct hid_device *hid = hiddev->hid;
|
|
struct usb_device *dev = hid_to_usb_dev(hid);
|
|
int idx, len;
|
|
char *buf;
|
|
|
|
if (get_user(idx, (int __user *)user_arg))
|
|
return -EFAULT;
|
|
|
|
if ((buf = kmalloc(HID_STRING_SIZE, GFP_KERNEL)) == NULL)
|
|
return -ENOMEM;
|
|
|
|
if ((len = usb_string(dev, idx, buf, HID_STRING_SIZE-1)) < 0) {
|
|
kfree(buf);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (copy_to_user(user_arg+sizeof(int), buf, len+1)) {
|
|
kfree(buf);
|
|
return -EFAULT;
|
|
}
|
|
|
|
kfree(buf);
|
|
|
|
return len;
|
|
}
|
|
|
|
static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct hiddev_list *list = file->private_data;
|
|
struct hiddev *hiddev = list->hiddev;
|
|
struct hid_device *hid;
|
|
struct hiddev_collection_info cinfo;
|
|
struct hiddev_report_info rinfo;
|
|
struct hiddev_field_info finfo;
|
|
struct hiddev_devinfo dinfo;
|
|
struct hid_report *report;
|
|
struct hid_field *field;
|
|
void __user *user_arg = (void __user *)arg;
|
|
int i, r = -EINVAL;
|
|
|
|
/* Called without BKL by compat methods so no BKL taken */
|
|
|
|
mutex_lock(&hiddev->existancelock);
|
|
if (!hiddev->exist) {
|
|
r = -ENODEV;
|
|
goto ret_unlock;
|
|
}
|
|
|
|
hid = hiddev->hid;
|
|
|
|
switch (cmd) {
|
|
|
|
case HIDIOCGVERSION:
|
|
r = put_user(HID_VERSION, (int __user *)arg) ?
|
|
-EFAULT : 0;
|
|
break;
|
|
|
|
case HIDIOCAPPLICATION:
|
|
if (arg < 0 || arg >= hid->maxapplication)
|
|
break;
|
|
|
|
for (i = 0; i < hid->maxcollection; i++)
|
|
if (hid->collection[i].type ==
|
|
HID_COLLECTION_APPLICATION && arg-- == 0)
|
|
break;
|
|
|
|
if (i < hid->maxcollection)
|
|
r = hid->collection[i].usage;
|
|
break;
|
|
|
|
case HIDIOCGDEVINFO:
|
|
{
|
|
struct usb_device *dev = hid_to_usb_dev(hid);
|
|
struct usbhid_device *usbhid = hid->driver_data;
|
|
|
|
memset(&dinfo, 0, sizeof(dinfo));
|
|
|
|
dinfo.bustype = BUS_USB;
|
|
dinfo.busnum = dev->bus->busnum;
|
|
dinfo.devnum = dev->devnum;
|
|
dinfo.ifnum = usbhid->ifnum;
|
|
dinfo.vendor = le16_to_cpu(dev->descriptor.idVendor);
|
|
dinfo.product = le16_to_cpu(dev->descriptor.idProduct);
|
|
dinfo.version = le16_to_cpu(dev->descriptor.bcdDevice);
|
|
dinfo.num_applications = hid->maxapplication;
|
|
|
|
r = copy_to_user(user_arg, &dinfo, sizeof(dinfo)) ?
|
|
-EFAULT : 0;
|
|
break;
|
|
}
|
|
|
|
case HIDIOCGFLAG:
|
|
r = put_user(list->flags, (int __user *)arg) ?
|
|
-EFAULT : 0;
|
|
break;
|
|
|
|
case HIDIOCSFLAG:
|
|
{
|
|
int newflags;
|
|
|
|
if (get_user(newflags, (int __user *)arg)) {
|
|
r = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
if ((newflags & ~HIDDEV_FLAGS) != 0 ||
|
|
((newflags & HIDDEV_FLAG_REPORT) != 0 &&
|
|
(newflags & HIDDEV_FLAG_UREF) == 0))
|
|
break;
|
|
|
|
list->flags = newflags;
|
|
|
|
r = 0;
|
|
break;
|
|
}
|
|
|
|
case HIDIOCGSTRING:
|
|
r = hiddev_ioctl_string(hiddev, cmd, user_arg);
|
|
break;
|
|
|
|
case HIDIOCINITREPORT:
|
|
usbhid_init_reports(hid);
|
|
r = 0;
|
|
break;
|
|
|
|
case HIDIOCGREPORT:
|
|
if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
|
|
r = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
if (rinfo.report_type == HID_REPORT_TYPE_OUTPUT)
|
|
break;
|
|
|
|
report = hiddev_lookup_report(hid, &rinfo);
|
|
if (report == NULL)
|
|
break;
|
|
|
|
usbhid_submit_report(hid, report, USB_DIR_IN);
|
|
usbhid_wait_io(hid);
|
|
|
|
r = 0;
|
|
break;
|
|
|
|
case HIDIOCSREPORT:
|
|
if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
|
|
r = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
if (rinfo.report_type == HID_REPORT_TYPE_INPUT)
|
|
break;
|
|
|
|
report = hiddev_lookup_report(hid, &rinfo);
|
|
if (report == NULL)
|
|
break;
|
|
|
|
usbhid_submit_report(hid, report, USB_DIR_OUT);
|
|
usbhid_wait_io(hid);
|
|
|
|
r = 0;
|
|
break;
|
|
|
|
case HIDIOCGREPORTINFO:
|
|
if (copy_from_user(&rinfo, user_arg, sizeof(rinfo))) {
|
|
r = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
report = hiddev_lookup_report(hid, &rinfo);
|
|
if (report == NULL)
|
|
break;
|
|
|
|
rinfo.num_fields = report->maxfield;
|
|
|
|
r = copy_to_user(user_arg, &rinfo, sizeof(rinfo)) ?
|
|
-EFAULT : 0;
|
|
break;
|
|
|
|
case HIDIOCGFIELDINFO:
|
|
if (copy_from_user(&finfo, user_arg, sizeof(finfo))) {
|
|
r = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
rinfo.report_type = finfo.report_type;
|
|
rinfo.report_id = finfo.report_id;
|
|
|
|
report = hiddev_lookup_report(hid, &rinfo);
|
|
if (report == NULL)
|
|
break;
|
|
|
|
if (finfo.field_index >= report->maxfield)
|
|
break;
|
|
|
|
field = report->field[finfo.field_index];
|
|
memset(&finfo, 0, sizeof(finfo));
|
|
finfo.report_type = rinfo.report_type;
|
|
finfo.report_id = rinfo.report_id;
|
|
finfo.field_index = field->report_count - 1;
|
|
finfo.maxusage = field->maxusage;
|
|
finfo.flags = field->flags;
|
|
finfo.physical = field->physical;
|
|
finfo.logical = field->logical;
|
|
finfo.application = field->application;
|
|
finfo.logical_minimum = field->logical_minimum;
|
|
finfo.logical_maximum = field->logical_maximum;
|
|
finfo.physical_minimum = field->physical_minimum;
|
|
finfo.physical_maximum = field->physical_maximum;
|
|
finfo.unit_exponent = field->unit_exponent;
|
|
finfo.unit = field->unit;
|
|
|
|
r = copy_to_user(user_arg, &finfo, sizeof(finfo)) ?
|
|
-EFAULT : 0;
|
|
break;
|
|
|
|
case HIDIOCGUCODE:
|
|
/* fall through */
|
|
case HIDIOCGUSAGE:
|
|
case HIDIOCSUSAGE:
|
|
case HIDIOCGUSAGES:
|
|
case HIDIOCSUSAGES:
|
|
case HIDIOCGCOLLECTIONINDEX:
|
|
r = hiddev_ioctl_usage(hiddev, cmd, user_arg);
|
|
break;
|
|
|
|
case HIDIOCGCOLLECTIONINFO:
|
|
if (copy_from_user(&cinfo, user_arg, sizeof(cinfo))) {
|
|
r = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
if (cinfo.index >= hid->maxcollection)
|
|
break;
|
|
|
|
cinfo.type = hid->collection[cinfo.index].type;
|
|
cinfo.usage = hid->collection[cinfo.index].usage;
|
|
cinfo.level = hid->collection[cinfo.index].level;
|
|
|
|
r = copy_to_user(user_arg, &cinfo, sizeof(cinfo)) ?
|
|
-EFAULT : 0;
|
|
break;
|
|
|
|
default:
|
|
if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ)
|
|
break;
|
|
|
|
if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGNAME(0))) {
|
|
int len = strlen(hid->name) + 1;
|
|
if (len > _IOC_SIZE(cmd))
|
|
len = _IOC_SIZE(cmd);
|
|
r = copy_to_user(user_arg, hid->name, len) ?
|
|
-EFAULT : len;
|
|
break;
|
|
}
|
|
|
|
if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGPHYS(0))) {
|
|
int len = strlen(hid->phys) + 1;
|
|
if (len > _IOC_SIZE(cmd))
|
|
len = _IOC_SIZE(cmd);
|
|
r = copy_to_user(user_arg, hid->phys, len) ?
|
|
-EFAULT : len;
|
|
break;
|
|
}
|
|
}
|
|
|
|
ret_unlock:
|
|
mutex_unlock(&hiddev->existancelock);
|
|
return r;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static long hiddev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
return hiddev_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
|
|
}
|
|
#endif
|
|
|
|
static const struct file_operations hiddev_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = hiddev_read,
|
|
.write = hiddev_write,
|
|
.poll = hiddev_poll,
|
|
.open = hiddev_open,
|
|
.release = hiddev_release,
|
|
.unlocked_ioctl = hiddev_ioctl,
|
|
.fasync = hiddev_fasync,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = hiddev_compat_ioctl,
|
|
#endif
|
|
.llseek = noop_llseek,
|
|
};
|
|
|
|
static char *hiddev_devnode(struct device *dev, umode_t *mode)
|
|
{
|
|
return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
|
|
}
|
|
|
|
static struct usb_class_driver hiddev_class = {
|
|
.name = "hiddev%d",
|
|
.devnode = hiddev_devnode,
|
|
.fops = &hiddev_fops,
|
|
.minor_base = HIDDEV_MINOR_BASE,
|
|
};
|
|
|
|
/*
|
|
* This is where hid.c calls us to connect a hid device to the hiddev driver
|
|
*/
|
|
int hiddev_connect(struct hid_device *hid, unsigned int force)
|
|
{
|
|
struct hiddev *hiddev;
|
|
struct usbhid_device *usbhid = hid->driver_data;
|
|
int retval;
|
|
|
|
if (!force) {
|
|
unsigned int i;
|
|
for (i = 0; i < hid->maxcollection; i++)
|
|
if (hid->collection[i].type ==
|
|
HID_COLLECTION_APPLICATION &&
|
|
!IS_INPUT_APPLICATION(hid->collection[i].usage))
|
|
break;
|
|
|
|
if (i == hid->maxcollection)
|
|
return -1;
|
|
}
|
|
|
|
if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL)))
|
|
return -1;
|
|
|
|
init_waitqueue_head(&hiddev->wait);
|
|
INIT_LIST_HEAD(&hiddev->list);
|
|
spin_lock_init(&hiddev->list_lock);
|
|
mutex_init(&hiddev->existancelock);
|
|
hid->hiddev = hiddev;
|
|
hiddev->hid = hid;
|
|
hiddev->exist = 1;
|
|
retval = usb_register_dev(usbhid->intf, &hiddev_class);
|
|
if (retval) {
|
|
hid_err(hid, "Not able to get a minor for this device\n");
|
|
hid->hiddev = NULL;
|
|
kfree(hiddev);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This is where hid.c calls us to disconnect a hiddev device from the
|
|
* corresponding hid device (usually because the usb device has disconnected)
|
|
*/
|
|
static struct usb_class_driver hiddev_class;
|
|
void hiddev_disconnect(struct hid_device *hid)
|
|
{
|
|
struct hiddev *hiddev = hid->hiddev;
|
|
struct usbhid_device *usbhid = hid->driver_data;
|
|
|
|
usb_deregister_dev(usbhid->intf, &hiddev_class);
|
|
|
|
mutex_lock(&hiddev->existancelock);
|
|
hiddev->exist = 0;
|
|
|
|
if (hiddev->open) {
|
|
mutex_unlock(&hiddev->existancelock);
|
|
usbhid_close(hiddev->hid);
|
|
wake_up_interruptible(&hiddev->wait);
|
|
} else {
|
|
mutex_unlock(&hiddev->existancelock);
|
|
kfree(hiddev);
|
|
}
|
|
}
|