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![Logan Gunthorpe](/assets/img/avatar_default.png)
Replace the open coded registration of the cdev and dev with the new device_add_cdev() helper in evdev, joydev and mousedev. The helper replaces a common pattern by taking the proper reference against the parent device and adding both the cdev and the device. Signed-off-by: Logan Gunthorpe <logang@deltatee.com> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1478 lines
33 KiB
C
1478 lines
33 KiB
C
/*
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* Event char devices, giving access to raw input device events.
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*
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* Copyright (c) 1999-2002 Vojtech Pavlik
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#define EVDEV_MINOR_BASE 64
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#define EVDEV_MINORS 32
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#define EVDEV_MIN_BUFFER_SIZE 64U
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#define EVDEV_BUF_PACKETS 8
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#include <linux/poll.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/input/mt.h>
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#include <linux/major.h>
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#include <linux/device.h>
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#include <linux/cdev.h>
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#include "input-compat.h"
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enum evdev_clock_type {
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EV_CLK_REAL = 0,
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EV_CLK_MONO,
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EV_CLK_BOOT,
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EV_CLK_MAX
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};
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struct evdev {
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int open;
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struct input_handle handle;
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wait_queue_head_t wait;
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struct evdev_client __rcu *grab;
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struct list_head client_list;
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spinlock_t client_lock; /* protects client_list */
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struct mutex mutex;
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struct device dev;
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struct cdev cdev;
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bool exist;
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};
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struct evdev_client {
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unsigned int head;
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unsigned int tail;
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unsigned int packet_head; /* [future] position of the first element of next packet */
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spinlock_t buffer_lock; /* protects access to buffer, head and tail */
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struct fasync_struct *fasync;
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struct evdev *evdev;
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struct list_head node;
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unsigned int clk_type;
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bool revoked;
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unsigned long *evmasks[EV_CNT];
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unsigned int bufsize;
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struct input_event buffer[];
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};
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static size_t evdev_get_mask_cnt(unsigned int type)
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{
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static const size_t counts[EV_CNT] = {
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/* EV_SYN==0 is EV_CNT, _not_ SYN_CNT, see EVIOCGBIT */
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[EV_SYN] = EV_CNT,
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[EV_KEY] = KEY_CNT,
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[EV_REL] = REL_CNT,
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[EV_ABS] = ABS_CNT,
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[EV_MSC] = MSC_CNT,
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[EV_SW] = SW_CNT,
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[EV_LED] = LED_CNT,
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[EV_SND] = SND_CNT,
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[EV_FF] = FF_CNT,
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};
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return (type < EV_CNT) ? counts[type] : 0;
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}
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/* requires the buffer lock to be held */
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static bool __evdev_is_filtered(struct evdev_client *client,
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unsigned int type,
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unsigned int code)
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{
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unsigned long *mask;
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size_t cnt;
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/* EV_SYN and unknown codes are never filtered */
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if (type == EV_SYN || type >= EV_CNT)
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return false;
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/* first test whether the type is filtered */
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mask = client->evmasks[0];
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if (mask && !test_bit(type, mask))
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return true;
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/* unknown values are never filtered */
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cnt = evdev_get_mask_cnt(type);
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if (!cnt || code >= cnt)
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return false;
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mask = client->evmasks[type];
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return mask && !test_bit(code, mask);
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}
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/* flush queued events of type @type, caller must hold client->buffer_lock */
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static void __evdev_flush_queue(struct evdev_client *client, unsigned int type)
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{
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unsigned int i, head, num;
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unsigned int mask = client->bufsize - 1;
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bool is_report;
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struct input_event *ev;
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BUG_ON(type == EV_SYN);
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head = client->tail;
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client->packet_head = client->tail;
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/* init to 1 so a leading SYN_REPORT will not be dropped */
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num = 1;
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for (i = client->tail; i != client->head; i = (i + 1) & mask) {
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ev = &client->buffer[i];
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is_report = ev->type == EV_SYN && ev->code == SYN_REPORT;
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if (ev->type == type) {
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/* drop matched entry */
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continue;
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} else if (is_report && !num) {
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/* drop empty SYN_REPORT groups */
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continue;
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} else if (head != i) {
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/* move entry to fill the gap */
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client->buffer[head].time = ev->time;
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client->buffer[head].type = ev->type;
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client->buffer[head].code = ev->code;
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client->buffer[head].value = ev->value;
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}
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num++;
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head = (head + 1) & mask;
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if (is_report) {
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num = 0;
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client->packet_head = head;
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}
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}
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client->head = head;
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}
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static void __evdev_queue_syn_dropped(struct evdev_client *client)
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{
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struct input_event ev;
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ktime_t time;
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time = client->clk_type == EV_CLK_REAL ?
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ktime_get_real() :
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client->clk_type == EV_CLK_MONO ?
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ktime_get() :
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ktime_get_boottime();
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ev.time = ktime_to_timeval(time);
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ev.type = EV_SYN;
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ev.code = SYN_DROPPED;
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ev.value = 0;
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client->buffer[client->head++] = ev;
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client->head &= client->bufsize - 1;
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if (unlikely(client->head == client->tail)) {
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/* drop queue but keep our SYN_DROPPED event */
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client->tail = (client->head - 1) & (client->bufsize - 1);
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client->packet_head = client->tail;
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}
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}
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static void evdev_queue_syn_dropped(struct evdev_client *client)
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{
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unsigned long flags;
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spin_lock_irqsave(&client->buffer_lock, flags);
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__evdev_queue_syn_dropped(client);
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spin_unlock_irqrestore(&client->buffer_lock, flags);
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}
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static int evdev_set_clk_type(struct evdev_client *client, unsigned int clkid)
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{
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unsigned long flags;
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unsigned int clk_type;
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switch (clkid) {
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case CLOCK_REALTIME:
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clk_type = EV_CLK_REAL;
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break;
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case CLOCK_MONOTONIC:
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clk_type = EV_CLK_MONO;
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break;
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case CLOCK_BOOTTIME:
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clk_type = EV_CLK_BOOT;
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break;
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default:
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return -EINVAL;
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}
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if (client->clk_type != clk_type) {
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client->clk_type = clk_type;
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/*
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* Flush pending events and queue SYN_DROPPED event,
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* but only if the queue is not empty.
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*/
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spin_lock_irqsave(&client->buffer_lock, flags);
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if (client->head != client->tail) {
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client->packet_head = client->head = client->tail;
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__evdev_queue_syn_dropped(client);
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}
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spin_unlock_irqrestore(&client->buffer_lock, flags);
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}
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return 0;
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}
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static void __pass_event(struct evdev_client *client,
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const struct input_event *event)
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{
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client->buffer[client->head++] = *event;
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client->head &= client->bufsize - 1;
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if (unlikely(client->head == client->tail)) {
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/*
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* This effectively "drops" all unconsumed events, leaving
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* EV_SYN/SYN_DROPPED plus the newest event in the queue.
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*/
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client->tail = (client->head - 2) & (client->bufsize - 1);
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client->buffer[client->tail].time = event->time;
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client->buffer[client->tail].type = EV_SYN;
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client->buffer[client->tail].code = SYN_DROPPED;
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client->buffer[client->tail].value = 0;
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client->packet_head = client->tail;
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}
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if (event->type == EV_SYN && event->code == SYN_REPORT) {
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client->packet_head = client->head;
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kill_fasync(&client->fasync, SIGIO, POLL_IN);
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}
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}
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static void evdev_pass_values(struct evdev_client *client,
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const struct input_value *vals, unsigned int count,
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ktime_t *ev_time)
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{
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struct evdev *evdev = client->evdev;
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const struct input_value *v;
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struct input_event event;
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bool wakeup = false;
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if (client->revoked)
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return;
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event.time = ktime_to_timeval(ev_time[client->clk_type]);
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/* Interrupts are disabled, just acquire the lock. */
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spin_lock(&client->buffer_lock);
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for (v = vals; v != vals + count; v++) {
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if (__evdev_is_filtered(client, v->type, v->code))
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continue;
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if (v->type == EV_SYN && v->code == SYN_REPORT) {
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/* drop empty SYN_REPORT */
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if (client->packet_head == client->head)
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continue;
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wakeup = true;
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}
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event.type = v->type;
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event.code = v->code;
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event.value = v->value;
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__pass_event(client, &event);
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}
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spin_unlock(&client->buffer_lock);
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if (wakeup)
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wake_up_interruptible(&evdev->wait);
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}
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/*
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* Pass incoming events to all connected clients.
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*/
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static void evdev_events(struct input_handle *handle,
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const struct input_value *vals, unsigned int count)
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{
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struct evdev *evdev = handle->private;
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struct evdev_client *client;
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ktime_t ev_time[EV_CLK_MAX];
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ev_time[EV_CLK_MONO] = ktime_get();
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ev_time[EV_CLK_REAL] = ktime_mono_to_real(ev_time[EV_CLK_MONO]);
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ev_time[EV_CLK_BOOT] = ktime_mono_to_any(ev_time[EV_CLK_MONO],
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TK_OFFS_BOOT);
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rcu_read_lock();
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client = rcu_dereference(evdev->grab);
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if (client)
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evdev_pass_values(client, vals, count, ev_time);
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else
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list_for_each_entry_rcu(client, &evdev->client_list, node)
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evdev_pass_values(client, vals, count, ev_time);
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rcu_read_unlock();
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}
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/*
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* Pass incoming event to all connected clients.
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*/
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static void evdev_event(struct input_handle *handle,
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unsigned int type, unsigned int code, int value)
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{
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struct input_value vals[] = { { type, code, value } };
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evdev_events(handle, vals, 1);
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}
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static int evdev_fasync(int fd, struct file *file, int on)
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{
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struct evdev_client *client = file->private_data;
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return fasync_helper(fd, file, on, &client->fasync);
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}
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static int evdev_flush(struct file *file, fl_owner_t id)
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{
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struct evdev_client *client = file->private_data;
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struct evdev *evdev = client->evdev;
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mutex_lock(&evdev->mutex);
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if (evdev->exist && !client->revoked)
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input_flush_device(&evdev->handle, file);
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mutex_unlock(&evdev->mutex);
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return 0;
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}
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static void evdev_free(struct device *dev)
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{
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struct evdev *evdev = container_of(dev, struct evdev, dev);
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input_put_device(evdev->handle.dev);
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kfree(evdev);
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}
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/*
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* Grabs an event device (along with underlying input device).
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* This function is called with evdev->mutex taken.
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*/
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static int evdev_grab(struct evdev *evdev, struct evdev_client *client)
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{
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int error;
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if (evdev->grab)
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return -EBUSY;
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error = input_grab_device(&evdev->handle);
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if (error)
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return error;
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rcu_assign_pointer(evdev->grab, client);
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return 0;
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}
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static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client)
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{
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struct evdev_client *grab = rcu_dereference_protected(evdev->grab,
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lockdep_is_held(&evdev->mutex));
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if (grab != client)
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return -EINVAL;
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rcu_assign_pointer(evdev->grab, NULL);
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synchronize_rcu();
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input_release_device(&evdev->handle);
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return 0;
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}
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static void evdev_attach_client(struct evdev *evdev,
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struct evdev_client *client)
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{
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spin_lock(&evdev->client_lock);
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list_add_tail_rcu(&client->node, &evdev->client_list);
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spin_unlock(&evdev->client_lock);
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}
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static void evdev_detach_client(struct evdev *evdev,
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struct evdev_client *client)
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{
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spin_lock(&evdev->client_lock);
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list_del_rcu(&client->node);
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spin_unlock(&evdev->client_lock);
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synchronize_rcu();
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}
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static int evdev_open_device(struct evdev *evdev)
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{
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int retval;
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retval = mutex_lock_interruptible(&evdev->mutex);
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if (retval)
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return retval;
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if (!evdev->exist)
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retval = -ENODEV;
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else if (!evdev->open++) {
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retval = input_open_device(&evdev->handle);
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if (retval)
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evdev->open--;
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}
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mutex_unlock(&evdev->mutex);
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return retval;
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}
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static void evdev_close_device(struct evdev *evdev)
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{
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mutex_lock(&evdev->mutex);
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if (evdev->exist && !--evdev->open)
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input_close_device(&evdev->handle);
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mutex_unlock(&evdev->mutex);
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}
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/*
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* Wake up users waiting for IO so they can disconnect from
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* dead device.
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*/
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static void evdev_hangup(struct evdev *evdev)
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{
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struct evdev_client *client;
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spin_lock(&evdev->client_lock);
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list_for_each_entry(client, &evdev->client_list, node)
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kill_fasync(&client->fasync, SIGIO, POLL_HUP);
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spin_unlock(&evdev->client_lock);
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wake_up_interruptible(&evdev->wait);
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}
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static int evdev_release(struct inode *inode, struct file *file)
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{
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struct evdev_client *client = file->private_data;
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struct evdev *evdev = client->evdev;
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unsigned int i;
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mutex_lock(&evdev->mutex);
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evdev_ungrab(evdev, client);
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mutex_unlock(&evdev->mutex);
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evdev_detach_client(evdev, client);
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for (i = 0; i < EV_CNT; ++i)
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kfree(client->evmasks[i]);
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kvfree(client);
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evdev_close_device(evdev);
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return 0;
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}
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|
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static unsigned int evdev_compute_buffer_size(struct input_dev *dev)
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{
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unsigned int n_events =
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max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS,
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EVDEV_MIN_BUFFER_SIZE);
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return roundup_pow_of_two(n_events);
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}
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static int evdev_open(struct inode *inode, struct file *file)
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{
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struct evdev *evdev = container_of(inode->i_cdev, struct evdev, cdev);
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unsigned int bufsize = evdev_compute_buffer_size(evdev->handle.dev);
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unsigned int size = sizeof(struct evdev_client) +
|
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bufsize * sizeof(struct input_event);
|
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struct evdev_client *client;
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int error;
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|
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client = kzalloc(size, GFP_KERNEL | __GFP_NOWARN);
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if (!client)
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client = vzalloc(size);
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if (!client)
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return -ENOMEM;
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|
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client->bufsize = bufsize;
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spin_lock_init(&client->buffer_lock);
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client->evdev = evdev;
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evdev_attach_client(evdev, client);
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error = evdev_open_device(evdev);
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if (error)
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goto err_free_client;
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file->private_data = client;
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nonseekable_open(inode, file);
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return 0;
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err_free_client:
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evdev_detach_client(evdev, client);
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kvfree(client);
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return error;
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}
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|
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static ssize_t evdev_write(struct file *file, const char __user *buffer,
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size_t count, loff_t *ppos)
|
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{
|
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struct evdev_client *client = file->private_data;
|
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struct evdev *evdev = client->evdev;
|
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struct input_event event;
|
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int retval = 0;
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|
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if (count != 0 && count < input_event_size())
|
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return -EINVAL;
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|
|
retval = mutex_lock_interruptible(&evdev->mutex);
|
|
if (retval)
|
|
return retval;
|
|
|
|
if (!evdev->exist || client->revoked) {
|
|
retval = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
while (retval + input_event_size() <= count) {
|
|
|
|
if (input_event_from_user(buffer + retval, &event)) {
|
|
retval = -EFAULT;
|
|
goto out;
|
|
}
|
|
retval += input_event_size();
|
|
|
|
input_inject_event(&evdev->handle,
|
|
event.type, event.code, event.value);
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&evdev->mutex);
|
|
return retval;
|
|
}
|
|
|
|
static int evdev_fetch_next_event(struct evdev_client *client,
|
|
struct input_event *event)
|
|
{
|
|
int have_event;
|
|
|
|
spin_lock_irq(&client->buffer_lock);
|
|
|
|
have_event = client->packet_head != client->tail;
|
|
if (have_event) {
|
|
*event = client->buffer[client->tail++];
|
|
client->tail &= client->bufsize - 1;
|
|
}
|
|
|
|
spin_unlock_irq(&client->buffer_lock);
|
|
|
|
return have_event;
|
|
}
|
|
|
|
static ssize_t evdev_read(struct file *file, char __user *buffer,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct evdev_client *client = file->private_data;
|
|
struct evdev *evdev = client->evdev;
|
|
struct input_event event;
|
|
size_t read = 0;
|
|
int error;
|
|
|
|
if (count != 0 && count < input_event_size())
|
|
return -EINVAL;
|
|
|
|
for (;;) {
|
|
if (!evdev->exist || client->revoked)
|
|
return -ENODEV;
|
|
|
|
if (client->packet_head == client->tail &&
|
|
(file->f_flags & O_NONBLOCK))
|
|
return -EAGAIN;
|
|
|
|
/*
|
|
* count == 0 is special - no IO is done but we check
|
|
* for error conditions (see above).
|
|
*/
|
|
if (count == 0)
|
|
break;
|
|
|
|
while (read + input_event_size() <= count &&
|
|
evdev_fetch_next_event(client, &event)) {
|
|
|
|
if (input_event_to_user(buffer + read, &event))
|
|
return -EFAULT;
|
|
|
|
read += input_event_size();
|
|
}
|
|
|
|
if (read)
|
|
break;
|
|
|
|
if (!(file->f_flags & O_NONBLOCK)) {
|
|
error = wait_event_interruptible(evdev->wait,
|
|
client->packet_head != client->tail ||
|
|
!evdev->exist || client->revoked);
|
|
if (error)
|
|
return error;
|
|
}
|
|
}
|
|
|
|
return read;
|
|
}
|
|
|
|
/* No kernel lock - fine */
|
|
static unsigned int evdev_poll(struct file *file, poll_table *wait)
|
|
{
|
|
struct evdev_client *client = file->private_data;
|
|
struct evdev *evdev = client->evdev;
|
|
unsigned int mask;
|
|
|
|
poll_wait(file, &evdev->wait, wait);
|
|
|
|
if (evdev->exist && !client->revoked)
|
|
mask = POLLOUT | POLLWRNORM;
|
|
else
|
|
mask = POLLHUP | POLLERR;
|
|
|
|
if (client->packet_head != client->tail)
|
|
mask |= POLLIN | POLLRDNORM;
|
|
|
|
return mask;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
|
|
#define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
|
|
|
|
#ifdef __BIG_ENDIAN
|
|
static int bits_to_user(unsigned long *bits, unsigned int maxbit,
|
|
unsigned int maxlen, void __user *p, int compat)
|
|
{
|
|
int len, i;
|
|
|
|
if (compat) {
|
|
len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t);
|
|
if (len > maxlen)
|
|
len = maxlen;
|
|
|
|
for (i = 0; i < len / sizeof(compat_long_t); i++)
|
|
if (copy_to_user((compat_long_t __user *) p + i,
|
|
(compat_long_t *) bits +
|
|
i + 1 - ((i % 2) << 1),
|
|
sizeof(compat_long_t)))
|
|
return -EFAULT;
|
|
} else {
|
|
len = BITS_TO_LONGS(maxbit) * sizeof(long);
|
|
if (len > maxlen)
|
|
len = maxlen;
|
|
|
|
if (copy_to_user(p, bits, len))
|
|
return -EFAULT;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
static int bits_from_user(unsigned long *bits, unsigned int maxbit,
|
|
unsigned int maxlen, const void __user *p, int compat)
|
|
{
|
|
int len, i;
|
|
|
|
if (compat) {
|
|
if (maxlen % sizeof(compat_long_t))
|
|
return -EINVAL;
|
|
|
|
len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t);
|
|
if (len > maxlen)
|
|
len = maxlen;
|
|
|
|
for (i = 0; i < len / sizeof(compat_long_t); i++)
|
|
if (copy_from_user((compat_long_t *) bits +
|
|
i + 1 - ((i % 2) << 1),
|
|
(compat_long_t __user *) p + i,
|
|
sizeof(compat_long_t)))
|
|
return -EFAULT;
|
|
if (i % 2)
|
|
*((compat_long_t *) bits + i - 1) = 0;
|
|
|
|
} else {
|
|
if (maxlen % sizeof(long))
|
|
return -EINVAL;
|
|
|
|
len = BITS_TO_LONGS(maxbit) * sizeof(long);
|
|
if (len > maxlen)
|
|
len = maxlen;
|
|
|
|
if (copy_from_user(bits, p, len))
|
|
return -EFAULT;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
#else
|
|
|
|
static int bits_to_user(unsigned long *bits, unsigned int maxbit,
|
|
unsigned int maxlen, void __user *p, int compat)
|
|
{
|
|
int len = compat ?
|
|
BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) :
|
|
BITS_TO_LONGS(maxbit) * sizeof(long);
|
|
|
|
if (len > maxlen)
|
|
len = maxlen;
|
|
|
|
return copy_to_user(p, bits, len) ? -EFAULT : len;
|
|
}
|
|
|
|
static int bits_from_user(unsigned long *bits, unsigned int maxbit,
|
|
unsigned int maxlen, const void __user *p, int compat)
|
|
{
|
|
size_t chunk_size = compat ? sizeof(compat_long_t) : sizeof(long);
|
|
int len;
|
|
|
|
if (maxlen % chunk_size)
|
|
return -EINVAL;
|
|
|
|
len = compat ? BITS_TO_LONGS_COMPAT(maxbit) : BITS_TO_LONGS(maxbit);
|
|
len *= chunk_size;
|
|
if (len > maxlen)
|
|
len = maxlen;
|
|
|
|
return copy_from_user(bits, p, len) ? -EFAULT : len;
|
|
}
|
|
|
|
#endif /* __BIG_ENDIAN */
|
|
|
|
#else
|
|
|
|
static int bits_to_user(unsigned long *bits, unsigned int maxbit,
|
|
unsigned int maxlen, void __user *p, int compat)
|
|
{
|
|
int len = BITS_TO_LONGS(maxbit) * sizeof(long);
|
|
|
|
if (len > maxlen)
|
|
len = maxlen;
|
|
|
|
return copy_to_user(p, bits, len) ? -EFAULT : len;
|
|
}
|
|
|
|
static int bits_from_user(unsigned long *bits, unsigned int maxbit,
|
|
unsigned int maxlen, const void __user *p, int compat)
|
|
{
|
|
int len;
|
|
|
|
if (maxlen % sizeof(long))
|
|
return -EINVAL;
|
|
|
|
len = BITS_TO_LONGS(maxbit) * sizeof(long);
|
|
if (len > maxlen)
|
|
len = maxlen;
|
|
|
|
return copy_from_user(bits, p, len) ? -EFAULT : len;
|
|
}
|
|
|
|
#endif /* CONFIG_COMPAT */
|
|
|
|
static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
|
|
{
|
|
int len;
|
|
|
|
if (!str)
|
|
return -ENOENT;
|
|
|
|
len = strlen(str) + 1;
|
|
if (len > maxlen)
|
|
len = maxlen;
|
|
|
|
return copy_to_user(p, str, len) ? -EFAULT : len;
|
|
}
|
|
|
|
static int handle_eviocgbit(struct input_dev *dev,
|
|
unsigned int type, unsigned int size,
|
|
void __user *p, int compat_mode)
|
|
{
|
|
unsigned long *bits;
|
|
int len;
|
|
|
|
switch (type) {
|
|
|
|
case 0: bits = dev->evbit; len = EV_MAX; break;
|
|
case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
|
|
case EV_REL: bits = dev->relbit; len = REL_MAX; break;
|
|
case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
|
|
case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
|
|
case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
|
|
case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
|
|
case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
|
|
case EV_SW: bits = dev->swbit; len = SW_MAX; break;
|
|
default: return -EINVAL;
|
|
}
|
|
|
|
return bits_to_user(bits, len, size, p, compat_mode);
|
|
}
|
|
|
|
static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p)
|
|
{
|
|
struct input_keymap_entry ke = {
|
|
.len = sizeof(unsigned int),
|
|
.flags = 0,
|
|
};
|
|
int __user *ip = (int __user *)p;
|
|
int error;
|
|
|
|
/* legacy case */
|
|
if (copy_from_user(ke.scancode, p, sizeof(unsigned int)))
|
|
return -EFAULT;
|
|
|
|
error = input_get_keycode(dev, &ke);
|
|
if (error)
|
|
return error;
|
|
|
|
if (put_user(ke.keycode, ip + 1))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int evdev_handle_get_keycode_v2(struct input_dev *dev, void __user *p)
|
|
{
|
|
struct input_keymap_entry ke;
|
|
int error;
|
|
|
|
if (copy_from_user(&ke, p, sizeof(ke)))
|
|
return -EFAULT;
|
|
|
|
error = input_get_keycode(dev, &ke);
|
|
if (error)
|
|
return error;
|
|
|
|
if (copy_to_user(p, &ke, sizeof(ke)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int evdev_handle_set_keycode(struct input_dev *dev, void __user *p)
|
|
{
|
|
struct input_keymap_entry ke = {
|
|
.len = sizeof(unsigned int),
|
|
.flags = 0,
|
|
};
|
|
int __user *ip = (int __user *)p;
|
|
|
|
if (copy_from_user(ke.scancode, p, sizeof(unsigned int)))
|
|
return -EFAULT;
|
|
|
|
if (get_user(ke.keycode, ip + 1))
|
|
return -EFAULT;
|
|
|
|
return input_set_keycode(dev, &ke);
|
|
}
|
|
|
|
static int evdev_handle_set_keycode_v2(struct input_dev *dev, void __user *p)
|
|
{
|
|
struct input_keymap_entry ke;
|
|
|
|
if (copy_from_user(&ke, p, sizeof(ke)))
|
|
return -EFAULT;
|
|
|
|
if (ke.len > sizeof(ke.scancode))
|
|
return -EINVAL;
|
|
|
|
return input_set_keycode(dev, &ke);
|
|
}
|
|
|
|
/*
|
|
* If we transfer state to the user, we should flush all pending events
|
|
* of the same type from the client's queue. Otherwise, they might end up
|
|
* with duplicate events, which can screw up client's state tracking.
|
|
* If bits_to_user fails after flushing the queue, we queue a SYN_DROPPED
|
|
* event so user-space will notice missing events.
|
|
*
|
|
* LOCKING:
|
|
* We need to take event_lock before buffer_lock to avoid dead-locks. But we
|
|
* need the even_lock only to guarantee consistent state. We can safely release
|
|
* it while flushing the queue. This allows input-core to handle filters while
|
|
* we flush the queue.
|
|
*/
|
|
static int evdev_handle_get_val(struct evdev_client *client,
|
|
struct input_dev *dev, unsigned int type,
|
|
unsigned long *bits, unsigned int maxbit,
|
|
unsigned int maxlen, void __user *p,
|
|
int compat)
|
|
{
|
|
int ret;
|
|
unsigned long *mem;
|
|
size_t len;
|
|
|
|
len = BITS_TO_LONGS(maxbit) * sizeof(unsigned long);
|
|
mem = kmalloc(len, GFP_KERNEL);
|
|
if (!mem)
|
|
return -ENOMEM;
|
|
|
|
spin_lock_irq(&dev->event_lock);
|
|
spin_lock(&client->buffer_lock);
|
|
|
|
memcpy(mem, bits, len);
|
|
|
|
spin_unlock(&dev->event_lock);
|
|
|
|
__evdev_flush_queue(client, type);
|
|
|
|
spin_unlock_irq(&client->buffer_lock);
|
|
|
|
ret = bits_to_user(mem, maxbit, maxlen, p, compat);
|
|
if (ret < 0)
|
|
evdev_queue_syn_dropped(client);
|
|
|
|
kfree(mem);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int evdev_handle_mt_request(struct input_dev *dev,
|
|
unsigned int size,
|
|
int __user *ip)
|
|
{
|
|
const struct input_mt *mt = dev->mt;
|
|
unsigned int code;
|
|
int max_slots;
|
|
int i;
|
|
|
|
if (get_user(code, &ip[0]))
|
|
return -EFAULT;
|
|
if (!mt || !input_is_mt_value(code))
|
|
return -EINVAL;
|
|
|
|
max_slots = (size - sizeof(__u32)) / sizeof(__s32);
|
|
for (i = 0; i < mt->num_slots && i < max_slots; i++) {
|
|
int value = input_mt_get_value(&mt->slots[i], code);
|
|
if (put_user(value, &ip[1 + i]))
|
|
return -EFAULT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int evdev_revoke(struct evdev *evdev, struct evdev_client *client,
|
|
struct file *file)
|
|
{
|
|
client->revoked = true;
|
|
evdev_ungrab(evdev, client);
|
|
input_flush_device(&evdev->handle, file);
|
|
wake_up_interruptible(&evdev->wait);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* must be called with evdev-mutex held */
|
|
static int evdev_set_mask(struct evdev_client *client,
|
|
unsigned int type,
|
|
const void __user *codes,
|
|
u32 codes_size,
|
|
int compat)
|
|
{
|
|
unsigned long flags, *mask, *oldmask;
|
|
size_t cnt;
|
|
int error;
|
|
|
|
/* we allow unknown types and 'codes_size > size' for forward-compat */
|
|
cnt = evdev_get_mask_cnt(type);
|
|
if (!cnt)
|
|
return 0;
|
|
|
|
mask = kcalloc(sizeof(unsigned long), BITS_TO_LONGS(cnt), GFP_KERNEL);
|
|
if (!mask)
|
|
return -ENOMEM;
|
|
|
|
error = bits_from_user(mask, cnt - 1, codes_size, codes, compat);
|
|
if (error < 0) {
|
|
kfree(mask);
|
|
return error;
|
|
}
|
|
|
|
spin_lock_irqsave(&client->buffer_lock, flags);
|
|
oldmask = client->evmasks[type];
|
|
client->evmasks[type] = mask;
|
|
spin_unlock_irqrestore(&client->buffer_lock, flags);
|
|
|
|
kfree(oldmask);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* must be called with evdev-mutex held */
|
|
static int evdev_get_mask(struct evdev_client *client,
|
|
unsigned int type,
|
|
void __user *codes,
|
|
u32 codes_size,
|
|
int compat)
|
|
{
|
|
unsigned long *mask;
|
|
size_t cnt, size, xfer_size;
|
|
int i;
|
|
int error;
|
|
|
|
/* we allow unknown types and 'codes_size > size' for forward-compat */
|
|
cnt = evdev_get_mask_cnt(type);
|
|
size = sizeof(unsigned long) * BITS_TO_LONGS(cnt);
|
|
xfer_size = min_t(size_t, codes_size, size);
|
|
|
|
if (cnt > 0) {
|
|
mask = client->evmasks[type];
|
|
if (mask) {
|
|
error = bits_to_user(mask, cnt - 1,
|
|
xfer_size, codes, compat);
|
|
if (error < 0)
|
|
return error;
|
|
} else {
|
|
/* fake mask with all bits set */
|
|
for (i = 0; i < xfer_size; i++)
|
|
if (put_user(0xffU, (u8 __user *)codes + i))
|
|
return -EFAULT;
|
|
}
|
|
}
|
|
|
|
if (xfer_size < codes_size)
|
|
if (clear_user(codes + xfer_size, codes_size - xfer_size))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long evdev_do_ioctl(struct file *file, unsigned int cmd,
|
|
void __user *p, int compat_mode)
|
|
{
|
|
struct evdev_client *client = file->private_data;
|
|
struct evdev *evdev = client->evdev;
|
|
struct input_dev *dev = evdev->handle.dev;
|
|
struct input_absinfo abs;
|
|
struct input_mask mask;
|
|
struct ff_effect effect;
|
|
int __user *ip = (int __user *)p;
|
|
unsigned int i, t, u, v;
|
|
unsigned int size;
|
|
int error;
|
|
|
|
/* First we check for fixed-length commands */
|
|
switch (cmd) {
|
|
|
|
case EVIOCGVERSION:
|
|
return put_user(EV_VERSION, ip);
|
|
|
|
case EVIOCGID:
|
|
if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
|
|
return -EFAULT;
|
|
return 0;
|
|
|
|
case EVIOCGREP:
|
|
if (!test_bit(EV_REP, dev->evbit))
|
|
return -ENOSYS;
|
|
if (put_user(dev->rep[REP_DELAY], ip))
|
|
return -EFAULT;
|
|
if (put_user(dev->rep[REP_PERIOD], ip + 1))
|
|
return -EFAULT;
|
|
return 0;
|
|
|
|
case EVIOCSREP:
|
|
if (!test_bit(EV_REP, dev->evbit))
|
|
return -ENOSYS;
|
|
if (get_user(u, ip))
|
|
return -EFAULT;
|
|
if (get_user(v, ip + 1))
|
|
return -EFAULT;
|
|
|
|
input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
|
|
input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
|
|
|
|
return 0;
|
|
|
|
case EVIOCRMFF:
|
|
return input_ff_erase(dev, (int)(unsigned long) p, file);
|
|
|
|
case EVIOCGEFFECTS:
|
|
i = test_bit(EV_FF, dev->evbit) ?
|
|
dev->ff->max_effects : 0;
|
|
if (put_user(i, ip))
|
|
return -EFAULT;
|
|
return 0;
|
|
|
|
case EVIOCGRAB:
|
|
if (p)
|
|
return evdev_grab(evdev, client);
|
|
else
|
|
return evdev_ungrab(evdev, client);
|
|
|
|
case EVIOCREVOKE:
|
|
if (p)
|
|
return -EINVAL;
|
|
else
|
|
return evdev_revoke(evdev, client, file);
|
|
|
|
case EVIOCGMASK: {
|
|
void __user *codes_ptr;
|
|
|
|
if (copy_from_user(&mask, p, sizeof(mask)))
|
|
return -EFAULT;
|
|
|
|
codes_ptr = (void __user *)(unsigned long)mask.codes_ptr;
|
|
return evdev_get_mask(client,
|
|
mask.type, codes_ptr, mask.codes_size,
|
|
compat_mode);
|
|
}
|
|
|
|
case EVIOCSMASK: {
|
|
const void __user *codes_ptr;
|
|
|
|
if (copy_from_user(&mask, p, sizeof(mask)))
|
|
return -EFAULT;
|
|
|
|
codes_ptr = (const void __user *)(unsigned long)mask.codes_ptr;
|
|
return evdev_set_mask(client,
|
|
mask.type, codes_ptr, mask.codes_size,
|
|
compat_mode);
|
|
}
|
|
|
|
case EVIOCSCLOCKID:
|
|
if (copy_from_user(&i, p, sizeof(unsigned int)))
|
|
return -EFAULT;
|
|
|
|
return evdev_set_clk_type(client, i);
|
|
|
|
case EVIOCGKEYCODE:
|
|
return evdev_handle_get_keycode(dev, p);
|
|
|
|
case EVIOCSKEYCODE:
|
|
return evdev_handle_set_keycode(dev, p);
|
|
|
|
case EVIOCGKEYCODE_V2:
|
|
return evdev_handle_get_keycode_v2(dev, p);
|
|
|
|
case EVIOCSKEYCODE_V2:
|
|
return evdev_handle_set_keycode_v2(dev, p);
|
|
}
|
|
|
|
size = _IOC_SIZE(cmd);
|
|
|
|
/* Now check variable-length commands */
|
|
#define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT))
|
|
switch (EVIOC_MASK_SIZE(cmd)) {
|
|
|
|
case EVIOCGPROP(0):
|
|
return bits_to_user(dev->propbit, INPUT_PROP_MAX,
|
|
size, p, compat_mode);
|
|
|
|
case EVIOCGMTSLOTS(0):
|
|
return evdev_handle_mt_request(dev, size, ip);
|
|
|
|
case EVIOCGKEY(0):
|
|
return evdev_handle_get_val(client, dev, EV_KEY, dev->key,
|
|
KEY_MAX, size, p, compat_mode);
|
|
|
|
case EVIOCGLED(0):
|
|
return evdev_handle_get_val(client, dev, EV_LED, dev->led,
|
|
LED_MAX, size, p, compat_mode);
|
|
|
|
case EVIOCGSND(0):
|
|
return evdev_handle_get_val(client, dev, EV_SND, dev->snd,
|
|
SND_MAX, size, p, compat_mode);
|
|
|
|
case EVIOCGSW(0):
|
|
return evdev_handle_get_val(client, dev, EV_SW, dev->sw,
|
|
SW_MAX, size, p, compat_mode);
|
|
|
|
case EVIOCGNAME(0):
|
|
return str_to_user(dev->name, size, p);
|
|
|
|
case EVIOCGPHYS(0):
|
|
return str_to_user(dev->phys, size, p);
|
|
|
|
case EVIOCGUNIQ(0):
|
|
return str_to_user(dev->uniq, size, p);
|
|
|
|
case EVIOC_MASK_SIZE(EVIOCSFF):
|
|
if (input_ff_effect_from_user(p, size, &effect))
|
|
return -EFAULT;
|
|
|
|
error = input_ff_upload(dev, &effect, file);
|
|
if (error)
|
|
return error;
|
|
|
|
if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Multi-number variable-length handlers */
|
|
if (_IOC_TYPE(cmd) != 'E')
|
|
return -EINVAL;
|
|
|
|
if (_IOC_DIR(cmd) == _IOC_READ) {
|
|
|
|
if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0)))
|
|
return handle_eviocgbit(dev,
|
|
_IOC_NR(cmd) & EV_MAX, size,
|
|
p, compat_mode);
|
|
|
|
if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
|
|
|
|
if (!dev->absinfo)
|
|
return -EINVAL;
|
|
|
|
t = _IOC_NR(cmd) & ABS_MAX;
|
|
abs = dev->absinfo[t];
|
|
|
|
if (copy_to_user(p, &abs, min_t(size_t,
|
|
size, sizeof(struct input_absinfo))))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (_IOC_DIR(cmd) == _IOC_WRITE) {
|
|
|
|
if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
|
|
|
|
if (!dev->absinfo)
|
|
return -EINVAL;
|
|
|
|
t = _IOC_NR(cmd) & ABS_MAX;
|
|
|
|
if (copy_from_user(&abs, p, min_t(size_t,
|
|
size, sizeof(struct input_absinfo))))
|
|
return -EFAULT;
|
|
|
|
if (size < sizeof(struct input_absinfo))
|
|
abs.resolution = 0;
|
|
|
|
/* We can't change number of reserved MT slots */
|
|
if (t == ABS_MT_SLOT)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Take event lock to ensure that we are not
|
|
* changing device parameters in the middle
|
|
* of event.
|
|
*/
|
|
spin_lock_irq(&dev->event_lock);
|
|
dev->absinfo[t] = abs;
|
|
spin_unlock_irq(&dev->event_lock);
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
|
|
void __user *p, int compat_mode)
|
|
{
|
|
struct evdev_client *client = file->private_data;
|
|
struct evdev *evdev = client->evdev;
|
|
int retval;
|
|
|
|
retval = mutex_lock_interruptible(&evdev->mutex);
|
|
if (retval)
|
|
return retval;
|
|
|
|
if (!evdev->exist || client->revoked) {
|
|
retval = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
retval = evdev_do_ioctl(file, cmd, p, compat_mode);
|
|
|
|
out:
|
|
mutex_unlock(&evdev->mutex);
|
|
return retval;
|
|
}
|
|
|
|
static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static long evdev_ioctl_compat(struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
|
|
}
|
|
#endif
|
|
|
|
static const struct file_operations evdev_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = evdev_read,
|
|
.write = evdev_write,
|
|
.poll = evdev_poll,
|
|
.open = evdev_open,
|
|
.release = evdev_release,
|
|
.unlocked_ioctl = evdev_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = evdev_ioctl_compat,
|
|
#endif
|
|
.fasync = evdev_fasync,
|
|
.flush = evdev_flush,
|
|
.llseek = no_llseek,
|
|
};
|
|
|
|
/*
|
|
* Mark device non-existent. This disables writes, ioctls and
|
|
* prevents new users from opening the device. Already posted
|
|
* blocking reads will stay, however new ones will fail.
|
|
*/
|
|
static void evdev_mark_dead(struct evdev *evdev)
|
|
{
|
|
mutex_lock(&evdev->mutex);
|
|
evdev->exist = false;
|
|
mutex_unlock(&evdev->mutex);
|
|
}
|
|
|
|
static void evdev_cleanup(struct evdev *evdev)
|
|
{
|
|
struct input_handle *handle = &evdev->handle;
|
|
|
|
evdev_mark_dead(evdev);
|
|
evdev_hangup(evdev);
|
|
|
|
/* evdev is marked dead so no one else accesses evdev->open */
|
|
if (evdev->open) {
|
|
input_flush_device(handle, NULL);
|
|
input_close_device(handle);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Create new evdev device. Note that input core serializes calls
|
|
* to connect and disconnect.
|
|
*/
|
|
static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
|
|
const struct input_device_id *id)
|
|
{
|
|
struct evdev *evdev;
|
|
int minor;
|
|
int dev_no;
|
|
int error;
|
|
|
|
minor = input_get_new_minor(EVDEV_MINOR_BASE, EVDEV_MINORS, true);
|
|
if (minor < 0) {
|
|
error = minor;
|
|
pr_err("failed to reserve new minor: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL);
|
|
if (!evdev) {
|
|
error = -ENOMEM;
|
|
goto err_free_minor;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&evdev->client_list);
|
|
spin_lock_init(&evdev->client_lock);
|
|
mutex_init(&evdev->mutex);
|
|
init_waitqueue_head(&evdev->wait);
|
|
evdev->exist = true;
|
|
|
|
dev_no = minor;
|
|
/* Normalize device number if it falls into legacy range */
|
|
if (dev_no < EVDEV_MINOR_BASE + EVDEV_MINORS)
|
|
dev_no -= EVDEV_MINOR_BASE;
|
|
dev_set_name(&evdev->dev, "event%d", dev_no);
|
|
|
|
evdev->handle.dev = input_get_device(dev);
|
|
evdev->handle.name = dev_name(&evdev->dev);
|
|
evdev->handle.handler = handler;
|
|
evdev->handle.private = evdev;
|
|
|
|
evdev->dev.devt = MKDEV(INPUT_MAJOR, minor);
|
|
evdev->dev.class = &input_class;
|
|
evdev->dev.parent = &dev->dev;
|
|
evdev->dev.release = evdev_free;
|
|
device_initialize(&evdev->dev);
|
|
|
|
error = input_register_handle(&evdev->handle);
|
|
if (error)
|
|
goto err_free_evdev;
|
|
|
|
cdev_init(&evdev->cdev, &evdev_fops);
|
|
|
|
error = cdev_device_add(&evdev->cdev, &evdev->dev);
|
|
if (error)
|
|
goto err_cleanup_evdev;
|
|
|
|
return 0;
|
|
|
|
err_cleanup_evdev:
|
|
evdev_cleanup(evdev);
|
|
input_unregister_handle(&evdev->handle);
|
|
err_free_evdev:
|
|
put_device(&evdev->dev);
|
|
err_free_minor:
|
|
input_free_minor(minor);
|
|
return error;
|
|
}
|
|
|
|
static void evdev_disconnect(struct input_handle *handle)
|
|
{
|
|
struct evdev *evdev = handle->private;
|
|
|
|
cdev_device_del(&evdev->cdev, &evdev->dev);
|
|
evdev_cleanup(evdev);
|
|
input_free_minor(MINOR(evdev->dev.devt));
|
|
input_unregister_handle(handle);
|
|
put_device(&evdev->dev);
|
|
}
|
|
|
|
static const struct input_device_id evdev_ids[] = {
|
|
{ .driver_info = 1 }, /* Matches all devices */
|
|
{ }, /* Terminating zero entry */
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(input, evdev_ids);
|
|
|
|
static struct input_handler evdev_handler = {
|
|
.event = evdev_event,
|
|
.events = evdev_events,
|
|
.connect = evdev_connect,
|
|
.disconnect = evdev_disconnect,
|
|
.legacy_minors = true,
|
|
.minor = EVDEV_MINOR_BASE,
|
|
.name = "evdev",
|
|
.id_table = evdev_ids,
|
|
};
|
|
|
|
static int __init evdev_init(void)
|
|
{
|
|
return input_register_handler(&evdev_handler);
|
|
}
|
|
|
|
static void __exit evdev_exit(void)
|
|
{
|
|
input_unregister_handler(&evdev_handler);
|
|
}
|
|
|
|
module_init(evdev_init);
|
|
module_exit(evdev_exit);
|
|
|
|
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
|
|
MODULE_DESCRIPTION("Input driver event char devices");
|
|
MODULE_LICENSE("GPL");
|