cregit-Linux how code gets into the kernel

Release 4.14 drivers/input/joydev.c

Directory: drivers/input
/*
 * Joystick device driver for the input driver suite.
 *
 * Copyright (c) 1999-2002 Vojtech Pavlik
 * Copyright (c) 1999 Colin Van Dyke
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <asm/io.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/joystick.h>
#include <linux/input.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/cdev.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Joystick device interfaces");
MODULE_SUPPORTED_DEVICE("input/js");
MODULE_LICENSE("GPL");


#define JOYDEV_MINOR_BASE	0

#define JOYDEV_MINORS		16

#define JOYDEV_BUFFER_SIZE	64


struct joydev {
	
int open;
	
struct input_handle handle;
	
wait_queue_head_t wait;
	
struct list_head client_list;
	
spinlock_t client_lock; /* protects client_list */
	
struct mutex mutex;
	
struct device dev;
	
struct cdev cdev;
	
bool exist;

	
struct js_corr corr[ABS_CNT];
	
struct JS_DATA_SAVE_TYPE glue;
	
int nabs;
	
int nkey;
	
__u16 keymap[KEY_MAX - BTN_MISC + 1];
	
__u16 keypam[KEY_MAX - BTN_MISC + 1];
	
__u8 absmap[ABS_CNT];
	
__u8 abspam[ABS_CNT];
	
__s16 abs[ABS_CNT];
};


struct joydev_client {
	
struct js_event buffer[JOYDEV_BUFFER_SIZE];
	
int head;
	
int tail;
	
int startup;
	
spinlock_t buffer_lock; /* protects access to buffer, head and tail */
	
struct fasync_struct *fasync;
	
struct joydev *joydev;
	
struct list_head node;
};


static int joydev_correct(int value, struct js_corr *corr) { switch (corr->type) { case JS_CORR_NONE: break; case JS_CORR_BROKEN: value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 : ((corr->coef[3] * (value - corr->coef[1])) >> 14)) : ((corr->coef[2] * (value - corr->coef[0])) >> 14); break; default: return 0; } return clamp(value, -32767, 32767); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)11194.87%250.00%
Dmitry Torokhov65.13%250.00%
Total117100.00%4100.00%


static void joydev_pass_event(struct joydev_client *client, struct js_event *event) { struct joydev *joydev = client->joydev; /* * IRQs already disabled, just acquire the lock */ spin_lock(&client->buffer_lock); client->buffer[client->head] = *event; if (client->startup == joydev->nabs + joydev->nkey) { client->head++; client->head &= JOYDEV_BUFFER_SIZE - 1; if (client->tail == client->head) client->startup = 0; } spin_unlock(&client->buffer_lock); kill_fasync(&client->fasync, SIGIO, POLL_IN); }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Torokhov111100.00%1100.00%
Total111100.00%1100.00%


static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value) { struct joydev *joydev = handle->private; struct joydev_client *client; struct js_event event; switch (type) { case EV_KEY: if (code < BTN_MISC || value == 2) return; event.type = JS_EVENT_BUTTON; event.number = joydev->keymap[code - BTN_MISC]; event.value = value; break; case EV_ABS: event.type = JS_EVENT_AXIS; event.number = joydev->absmap[code]; event.value = joydev_correct(value, &joydev->corr[event.number]); if (event.value == joydev->abs[event.number]) return; joydev->abs[event.number] = event.value; break; default: return; } event.time = jiffies_to_msecs(jiffies); rcu_read_lock(); list_for_each_entry_rcu(client, &joydev->client_list, node) joydev_pass_event(client, &event); rcu_read_unlock(); wake_up_interruptible(&joydev->wait); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)17287.76%440.00%
Dmitry Torokhov168.16%330.00%
Vojtech Pavlik73.57%220.00%
Tobias Klauser10.51%110.00%
Total196100.00%10100.00%


static int joydev_fasync(int fd, struct file *file, int on) { struct joydev_client *client = file->private_data; return fasync_helper(fd, file, on, &client->fasync); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3790.24%133.33%
Dmitry Torokhov37.32%133.33%
Jonathan Corbet12.44%133.33%
Total41100.00%3100.00%


static void joydev_free(struct device *dev) { struct joydev *joydev = container_of(dev, struct joydev, dev); input_put_device(joydev->handle.dev); kfree(joydev); }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Torokhov2665.00%266.67%
Christoph Hellwig1435.00%133.33%
Total40100.00%3100.00%


static void joydev_attach_client(struct joydev *joydev, struct joydev_client *client) { spin_lock(&joydev->client_lock); list_add_tail_rcu(&client->node, &joydev->client_list); spin_unlock(&joydev->client_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Torokhov3066.67%250.00%
Linus Torvalds (pre-git)1226.67%125.00%
Vojtech Pavlik36.67%125.00%
Total45100.00%4100.00%


static void joydev_detach_client(struct joydev *joydev, struct joydev_client *client) { spin_lock(&joydev->client_lock); list_del_rcu(&client->node); spin_unlock(&joydev->client_lock); synchronize_rcu(); }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Torokhov43100.00%2100.00%
Total43100.00%2100.00%


static void joydev_refresh_state(struct joydev *joydev) { struct input_dev *dev = joydev->handle.dev; int i, val; for (i = 0; i < joydev->nabs; i++) { val = input_abs_get_val(dev, joydev->abspam[i]); joydev->abs[i] = joydev_correct(val, &joydev->corr[i]); } }

Contributors

PersonTokensPropCommitsCommitProp
Raphaël Assénat78100.00%1100.00%
Total78100.00%1100.00%


static int joydev_open_device(struct joydev *joydev) { int retval; retval = mutex_lock_interruptible(&joydev->mutex); if (retval) return retval; if (!joydev->exist) retval = -ENODEV; else if (!joydev->open++) { retval = input_open_device(&joydev->handle); if (retval) joydev->open--; else joydev_refresh_state(joydev); } mutex_unlock(&joydev->mutex); return retval; }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Torokhov7077.78%120.00%
Oliver Neukum1112.22%120.00%
Raphaël Assénat66.67%120.00%
Linus Torvalds (pre-git)33.33%240.00%
Total90100.00%5100.00%


static void joydev_close_device(struct joydev *joydev) { mutex_lock(&joydev->mutex); if (joydev->exist && !--joydev->open) input_close_device(&joydev->handle); mutex_unlock(&joydev->mutex); }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Torokhov3574.47%133.33%
Linus Torvalds (pre-git)1225.53%266.67%
Total47100.00%3100.00%

/* * Wake up users waiting for IO so they can disconnect from * dead device. */
static void joydev_hangup(struct joydev *joydev) { struct joydev_client *client; spin_lock(&joydev->client_lock); list_for_each_entry(client, &joydev->client_list, node) kill_fasync(&client->fasync, SIGIO, POLL_HUP); spin_unlock(&joydev->client_lock); wake_up_interruptible(&joydev->wait); }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Torokhov60100.00%1100.00%
Total60100.00%1100.00%


static int joydev_release(struct inode *inode, struct file *file) { struct joydev_client *client = file->private_data; struct joydev *joydev = client->joydev; joydev_detach_client(joydev, client); kfree(client); joydev_close_device(joydev); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Torokhov5092.59%150.00%
Linus Torvalds (pre-git)47.41%150.00%
Total54100.00%2100.00%


static int joydev_open(struct inode *inode, struct file *file) { struct joydev *joydev = container_of(inode->i_cdev, struct joydev, cdev); struct joydev_client *client; int error; client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL); if (!client) return -ENOMEM; spin_lock_init(&client->buffer_lock); client->joydev = joydev; joydev_attach_client(joydev, client); error = joydev_open_device(joydev); if (error) goto err_free_client; file->private_data = client; nonseekable_open(inode, file); return 0; err_free_client: joydev_detach_client(joydev, client); kfree(client); return error; }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Torokhov8262.60%654.55%
Linus Torvalds (pre-git)4635.11%327.27%
Vojtech Pavlik21.53%19.09%
Eric Sesterhenn / Snakebyte10.76%19.09%
Total131100.00%11100.00%


static int joydev_generate_startup_event(struct joydev_client *client, struct input_dev *input, struct js_event *event) { struct joydev *joydev = client->joydev; int have_event; spin_lock_irq(&client->buffer_lock); have_event = client->startup < joydev->nabs + joydev->nkey; if (have_event) { event->time = jiffies_to_msecs(jiffies); if (client->startup < joydev->nkey) { event->type = JS_EVENT_BUTTON | JS_EVENT_INIT; event->number = client->startup; event->value = !!test_bit(joydev->keypam[event->number], input->key); } else { event->type = JS_EVENT_AXIS | JS_EVENT_INIT; event->number = client->startup - joydev->nkey; event->value = joydev->abs[event->number]; } client->startup++; } spin_unlock_irq(&client->buffer_lock); return have_event; }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Torokhov16193.60%150.00%
Linus Torvalds (pre-git)116.40%150.00%
Total172100.00%2100.00%


static int joydev_fetch_next_event(struct joydev_client *client, struct js_event *event) { int have_event; spin_lock_irq(&client->buffer_lock); have_event = client->head != client->tail; if (have_event) { *event = client->buffer[client->tail++]; client->tail &= JOYDEV_BUFFER_SIZE - 1; } spin_unlock_irq(&client->buffer_lock); return have_event; }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Torokhov7296.00%150.00%
Linus Torvalds (pre-git)34.00%150.00%
Total75100.00%2100.00%

/* * Old joystick interface */
static ssize_t joydev_0x_read(struct joydev_client *client, struct input_dev *input, char __user *buf) { struct joydev *joydev = client->joydev; struct JS_DATA_TYPE data; int i; spin_lock_irq(&input->event_lock); /* * Get device state */ for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++) data.buttons |= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0; data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x; data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y; /* * Reset reader's event queue */ spin_lock(&client->buffer_lock); client->startup = 0; client->tail = client->head; spin_unlock(&client->buffer_lock); spin_unlock_irq(&input->event_lock); if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE))) return -EFAULT; return sizeof(struct JS_DATA_TYPE); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)9344.08%233.33%
Dmitry Torokhov9143.13%233.33%
Linus Torvalds2612.32%116.67%
Al Viro10.47%116.67%
Total211100.00%6100.00%


static inline int joydev_data_pending(struct joydev_client *client) { struct joydev *joydev = client->joydev; return client->startup < joydev->nabs + joydev->nkey || client->head != client->tail; }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Torokhov42100.00%1100.00%
Total42100.00%1100.00%


static ssize_t joydev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { struct joydev_client *client = file->private_data; struct joydev *joydev = client->joydev; struct input_dev *input = joydev->handle.dev; struct js_event event; int retval; if (!joydev->exist) return -ENODEV; if (count < sizeof(struct js_event)) return -EINVAL; if (count == sizeof(struct JS_DATA_TYPE)) return joydev_0x_read(client, input, buf); if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK)) return -EAGAIN; retval = wait_event_interruptible(joydev->wait, !joydev->exist || joydev_data_pending(client)); if (retval) return retval; if (!joydev->exist) return -ENODEV; while (retval + sizeof(struct js_event) <= count && joydev_generate_startup_event(client, input, &event)) { if (copy_to_user(buf + retval, &event, sizeof(struct js_event))) return -EFAULT; retval += sizeof(struct js_event); } while (retval + sizeof(struct js_event) <= count && joydev_fetch_next_event(client, &event)) { if (copy_to_user(buf + retval, &event, sizeof(struct js_event))) return -EFAULT; retval += sizeof(struct js_event); } return retval; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)13349.26%116.67%
Dmitry Torokhov11542.59%350.00%
Vojtech Pavlik228.15%233.33%
Total270100.00%6100.00%

/* No kernel lock - fine */
static unsigned int joydev_poll(struct file *file, poll_table *wait) { struct joydev_client *client = file->private_data; struct joydev *joydev = client->joydev; poll_wait(file, &joydev->wait, wait); return (joydev_data_pending(client) ? (POLLIN | POLLRDNORM) : 0) | (joydev->exist ? 0 : (POLLHUP | POLLERR)); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)4052.63%125.00%
Vojtech Pavlik2127.63%125.00%
Dmitry Torokhov1519.74%250.00%
Total76100.00%4100.00%


static int joydev_handle_JSIOCSAXMAP(struct joydev *joydev, void __user *argp, size_t len) { __u8 *abspam; int i; int retval = 0; len = min(len, sizeof(joydev->abspam)); /* Validate the map. */ abspam = memdup_user(argp, len); if (IS_ERR(abspam)) return PTR_ERR(abspam); for (i = 0; i < joydev->nabs; i++) { if (abspam[i] > ABS_MAX) { retval = -EINVAL; goto out; } } memcpy(joydev->abspam, abspam, len); for (i = 0; i < joydev->nabs; i++) joydev->absmap[joydev->abspam[i]] = i; out: kfree(abspam); return retval; }

Contributors

PersonTokensPropCommitsCommitProp
Stephen Kitt11574.68%125.00%
Kenneth Waters2918.83%125.00%
Javier Martinez Canillas106.49%250.00%
Total154100.00%4100.00%


static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev, void __user *argp, size_t len) { __u16 *keypam; int i; int retval = 0; len = min(len, sizeof(joydev->keypam)); /* Validate the map. */ keypam = memdup_user(argp, len); if (IS_ERR(keypam)) return PTR_ERR(keypam); for (i = 0; i < joydev->nkey; i++) { if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) { retval = -EINVAL; goto out; } } memcpy(joydev->keypam, keypam, len); for (i = 0; i < joydev->nkey; i++) joydev->keymap[keypam[i] - BTN_MISC] = i; out: kfree(keypam); return retval; }

Contributors

PersonTokensPropCommitsCommitProp
Stephen Kitt15193.79%133.33%
Javier Martinez Canillas106.21%266.67%
Total161100.00%3100.00%


static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __user *argp) { struct input_dev *dev = joydev->handle.dev; size_t len; int i; const char *name; /* Process fixed-sized commands. */ switch (cmd) { case JS_SET_CAL: return copy_from_user(&joydev->glue.JS_CORR, argp, sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0; case JS_GET_CAL: return copy_to_user(argp, &joydev->glue.JS_CORR, sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0; case JS_SET_TIMEOUT: return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp); case JS_GET_TIMEOUT: return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp); case JSIOCGVERSION: return put_user(JS_VERSION, (__u32 __user *) argp); case JSIOCGAXES: return put_user(joydev->nabs, (__u8 __user *) argp); case JSIOCGBUTTONS: return put_user(joydev->nkey, (__u8 __user *) argp); case JSIOCSCORR: if (copy_from_user(joydev->corr, argp, sizeof(joydev->corr[0]) * joydev->nabs)) return -EFAULT; for (i = 0; i < joydev->nabs; i++) { int val = input_abs_get_val(dev, joydev->abspam[i]); joydev->abs[i] = joydev_correct(val, &joydev->corr[i]); } return 0; case JSIOCGCORR: return copy_to_user(argp, joydev->corr, sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0; } /* * Process variable-sized commands (the axis and button map commands * are considered variable-sized to decouple them from the values of * ABS_MAX and KEY_MAX). */ switch (cmd & ~IOCSIZE_MASK) { case (JSIOCSAXMAP & ~IOCSIZE_MASK): return joydev_handle_JSIOCSAXMAP(joydev, argp, _IOC_SIZE(cmd)); case (JSIOCGAXMAP & ~IOCSIZE_MASK): len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam)); return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len; case (JSIOCSBTNMAP & ~IOCSIZE_MASK): return joydev_handle_JSIOCSBTNMAP(joydev, argp, _IOC_SIZE(cmd)); case (JSIOCGBTNMAP & ~IOCSIZE_MASK): len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam)); return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len; case JSIOCGNAME(0): name = dev->name; if (!name) return 0; len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1); return copy_to_user(argp, name, len) ? -EFAULT : len; } return -EINVAL; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)24246.72%216.67%
Stephen Kitt12023.17%216.67%
Linus Torvalds468.88%18.33%
Glenn Burkhardt458.69%18.33%
Jeremy Fitzhardinge356.76%18.33%
Al Viro132.51%18.33%
Daniel Mack112.12%216.67%
Thadeu Lima de Souza Cascardo30.58%18.33%
Dmitry Torokhov30.58%18.33%
Total518100.00%12100.00%

#ifdef CONFIG_COMPAT
static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct joydev_client *client = file->private_data; struct joydev *joydev = client->joydev; void __user *argp = (void __user *)arg; s32 tmp32; struct JS_DATA_SAVE_TYPE_32 ds32; int retval; retval = mutex_lock_interruptible(&joydev->mutex); if (retval) return retval; if (!joydev->exist) { retval = -ENODEV; goto out; } switch (cmd) { case JS_SET_TIMELIMIT: retval = get_user(tmp32, (s32 __user *) arg); if (retval == 0) joydev->glue.JS_TIMELIMIT = tmp32; break; case JS_GET_TIMELIMIT: tmp32 = joydev->glue.JS_TIMELIMIT; retval = put_user(tmp32, (s32 __user *) arg); break; case JS_SET_ALL: retval = copy_from_user(&ds32, argp, sizeof(ds32)) ? -EFAULT : 0; if (retval == 0) { joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT; joydev->glue.BUSY = ds32.BUSY; joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME; joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT; joydev->glue.JS_SAVE = ds32.JS_SAVE; joydev->glue.JS_CORR = ds32.JS_CORR; } break; case JS_GET_ALL: ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT; ds32.BUSY = joydev->glue.BUSY; ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME; ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT; ds32.JS_SAVE = joydev->glue.JS_SAVE; ds32.JS_CORR = joydev->glue.JS_CORR; retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0; break; default: retval = joydev_ioctl_common(joydev, cmd, argp); break; } out: mutex_unlock(&joydev->mutex); return retval; }

Contributors

PersonTokensPropCommitsCommitProp
Jeremy Fitzhardinge30885.79%125.00%
Dmitry Torokhov4813.37%250.00%
Linus Torvalds (pre-git)30.84%125.00%
Total359100.00%4100.00%

#endif /* CONFIG_COMPAT */
static long joydev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct joydev_client *client = file->private_data; struct joydev *joydev = client->joydev; void __user *argp = (void __user *)arg; int retval; retval = mutex_lock_interruptible(&joydev->mutex); if (retval) return retval; if (!joydev->exist) { retval = -ENODEV; goto out; } switch (cmd) { case JS_SET_TIMELIMIT: retval = get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg); break; case JS_GET_TIMELIMIT: retval = put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg); break; case JS_SET_ALL: retval = copy_from_user(&joydev->glue, argp, sizeof(joydev->glue)) ? -EFAULT : 0; break; case JS_GET_ALL: retval = copy_to_user(argp, &joydev->glue, sizeof(joydev->glue)) ? -EFAULT : 0; break; default: retval = joydev_ioctl_common(joydev, cmd, argp); break; } out: mutex_unlock(&joydev->mutex); return retval; }

Contributors

PersonTokensPropCommitsCommitProp
Jeremy Fitzhardinge15370.18%133.33%
Dmitry Torokhov6529.82%266.67%
Total218100.00%3100.00%

static const struct file_operations joydev_fops = { .owner = THIS_MODULE, .read = joydev_read, .poll = joydev_poll, .open = joydev_open, .release = joydev_release, .unlocked_ioctl = joydev_ioctl, #ifdef CONFIG_COMPAT .compat_ioctl = joydev_compat_ioctl, #endif .fasync = joydev_fasync, .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 joydev_mark_dead(struct joydev *joydev) { mutex_lock(&joydev->mutex); joydev->exist = false; mutex_unlock(&joydev->mutex); }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Torokhov33100.00%2100.00%
Total33100.00%2100.00%


static void joydev_cleanup(struct joydev *joydev) { struct input_handle *handle = &joydev->handle; joydev_mark_dead(joydev); joydev_hangup(joydev); /* joydev is marked dead so no one else accesses joydev->open */ if (joydev->open) input_close_device(handle); }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Torokhov4297.67%150.00%
Lucas De Marchi12.33%150.00%
Total43100.00%2100.00%

/* * These codes are copied from from hid-ids.h, unfortunately there is no common * usb_ids/bt_ids.h header. */ #define USB_VENDOR_ID_SONY 0x054c #define USB_DEVICE_ID_SONY_PS3_CONTROLLER 0x0268 #define USB_DEVICE_ID_SONY_PS4_CONTROLLER 0x05c4 #define USB_DEVICE_ID_SONY_PS4_CONTROLLER_2 0x09cc #define USB_DEVICE_ID_SONY_PS4_CONTROLLER_DONGLE 0x0ba0 #define USB_VENDOR_ID_THQ 0x20d6 #define USB_DEVICE_ID_THQ_PS3_UDRAW 0xcb17 #define ACCEL_DEV(vnd, prd) \ { \ .flags = INPUT_DEVICE_ID_MATCH_VENDOR | \ INPUT_DEVICE_ID_MATCH_PRODUCT | \ INPUT_DEVICE_ID_MATCH_PROPBIT, \ .vendor = (vnd), \ .product = (prd), \ .propbit = { BIT_MASK(INPUT_PROP_ACCELEROMETER) }, \ } static const struct input_device_id joydev_blacklist[] = { /* Avoid touchpads and touchscreens */ { .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT, .evbit = { BIT_MASK(EV_KEY) }, .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) }, }, /* Avoid tablets, digitisers and similar devices */ { .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT, .evbit = { BIT_MASK(EV_KEY) }, .keybit = { [BIT_WORD(BTN_DIGI)] = BIT_MASK(BTN_DIGI) }, }, /* Disable accelerometers on composite devices */ ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS3_CONTROLLER), ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS4_CONTROLLER), ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS4_CONTROLLER_2), ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS4_CONTROLLER_DONGLE), ACCEL_DEV(USB_VENDOR_ID_THQ, USB_DEVICE_ID_THQ_PS3_UDRAW), { /* sentinel */ } };
static bool joydev_dev_is_blacklisted(struct input_dev *dev) { const struct input_device_id *id; for (id = joydev_blacklist; id->flags; id++) { if (input_match_device_id(dev, id)) { dev_dbg(&dev->dev, "joydev: blacklisting '%s'\n", dev->name); return true; } } return false; }

Contributors

PersonTokensPropCommitsCommitProp
Roderick Colenbrander63100.00%1100.00%
Total63100.00%1100.00%


static bool joydev_dev_is_absolute_mouse(struct input_dev *dev) { DECLARE_BITMAP(jd_scratch, KEY_CNT); BUILD_BUG_ON(ABS_CNT > KEY_CNT || EV_CNT > KEY_CNT); /* * Virtualization (VMware, etc) and remote management (HP * ILO2) solutions use absolute coordinates for their virtual * pointing devices so that there is one-to-one relationship * between pointer position on the host screen and virtual * guest screen, and so their mice use ABS_X, ABS_Y and 3 * primary button events. This clashes with what joydev * considers to be joysticks (a device with at minimum ABS_X * axis). * * Here we are trying to separate absolute mice from * joysticks. A device is, for joystick detection purposes, * considered to be an absolute mouse if the following is * true: * * 1) Event types are exactly EV_ABS, EV_KEY and EV_SYN. * 2) Absolute events are exactly ABS_X and ABS_Y. * 3) Keys are exactly BTN_LEFT, BTN_RIGHT and BTN_MIDDLE. * 4) Device is not on "Amiga" bus. */ bitmap_zero(jd_scratch, EV_CNT); __set_bit(EV_ABS, jd_scratch); __set_bit(EV_KEY, jd_scratch); __set_bit(EV_SYN, jd_scratch); if (!bitmap_equal(jd_scratch, dev->evbit, EV_CNT)) return false; bitmap_zero(jd_scratch, ABS_CNT); __set_bit(ABS_X, jd_scratch); __set_bit(ABS_Y, jd_scratch); if (!bitmap_equal(dev->absbit, jd_scratch, ABS_CNT)) return false; bitmap_zero(jd_scratch, KEY_CNT); __set_bit(BTN_LEFT, jd_scratch); __set_bit(BTN_RIGHT, jd_scratch); __set_bit(BTN_MIDDLE, jd_scratch); if (!bitmap_equal(dev->keybit, jd_scratch, KEY_CNT)) return false; /* * Amiga joystick (amijoy) historically uses left/middle/right * button events. */ if (dev->id.bustype == BUS_AMIGA) return false; return true; }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Hellstrom175100.00%1100.00%
Total175100.00%1100.00%


static bool joydev_match(struct input_handler *handler, struct input_dev *dev) { /* Disable blacklisted devices */ if (joydev_dev_is_blacklisted(dev)) return false; /* Avoid absolute mice */ if (joydev_dev_is_absolute_mouse(dev)) return false; return true; }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Torokhov2868.29%133.33%
Thomas Hellstrom1126.83%133.33%
Roderick Colenbrander24.88%133.33%
Total41100.00%3100.00%


static int joydev_connect(struct input_handler *handler, struct input_dev *dev, const struct input_device_id *id) { struct joydev *joydev; int i, j, t, minor, dev_no; int error; minor = input_get_new_minor(JOYDEV_MINOR_BASE, JOYDEV_MINORS, true); if (minor < 0) { error = minor; pr_err("failed to reserve new minor: %d\n", error); return error; } joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL); if (!joydev) { error = -ENOMEM; goto err_free_minor; } INIT_LIST_HEAD(&joydev->client_list); spin_lock_init(&joydev->client_lock); mutex_init(&joydev->mutex); init_waitqueue_head(&joydev->wait); joydev->exist = true; dev_no = minor; /* Normalize device number if it falls into legacy range */ if (dev_no < JOYDEV_MINOR_BASE + JOYDEV_MINORS) dev_no -= JOYDEV_MINOR_BASE; dev_set_name(&joydev->dev, "js%d", dev_no); joydev->handle.dev = input_get_device(dev); joydev->handle.name = dev_name(&joydev->dev); joydev->handle.handler = handler; joydev->handle.private = joydev; for_each_set_bit(i, dev->absbit, ABS_CNT) { joydev->absmap[i] = joydev->nabs; joydev->abspam[joydev->nabs] = i; joydev->nabs++; } for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++) if (test_bit(i + BTN_MISC, dev->keybit)) { joydev->keymap[i] = joydev->nkey; joydev->keypam[joydev->nkey] = i + BTN_MISC; joydev->nkey++; } for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++) if (test_bit(i + BTN_MISC, dev->keybit)) { joydev->keymap[i] = joydev->nkey; joydev->keypam[joydev->nkey] = i + BTN_MISC; joydev->nkey++; } for (i = 0; i < joydev->nabs; i++) { j = joydev->abspam[i]; if (input_abs_get_max(dev, j) == input_abs_get_min(dev, j)) { joydev->corr[i].type = JS_CORR_NONE; continue; } joydev->corr[i].type = JS_CORR_BROKEN; joydev->corr[i].prec = input_abs_get_fuzz(dev, j); t = (input_abs_get_max(dev, j) + input_abs_get_min(dev, j)) / 2; joydev->corr[i].coef[0] = t - input_abs_get_flat(dev, j); joydev->corr[i].coef[1] = t + input_abs_get_flat(dev, j); t = (input_abs_get_max(dev, j) - input_abs_get_min(dev, j)) / 2 - 2 * input_abs_get_flat(dev, j); if (t) { joydev->corr[i].coef[2] = (1 << 29) / t; joydev->corr[i].coef[3] = (1 << 29) / t; } } joydev->dev.devt = MKDEV(INPUT_MAJOR, minor); joydev->dev.class = &input_class; joydev->dev.parent = &dev->dev; joydev->dev.release = joydev_free; device_initialize(&joydev->dev); error = input_register_handle(&joydev->handle); if (error) goto err_free_joydev; cdev_init(&joydev->cdev, &joydev_fops); error = cdev_device_add(&joydev->cdev, &joydev->dev); if (error) goto err_cleanup_joydev; return 0; err_cleanup_joydev: joydev_cleanup(joydev); input_unregister_handle(&joydev->handle); err_free_joydev: put_device(&joydev->dev); err_free_minor: input_free_minor(minor); return error; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)38152.48%521.74%
Dmitry Torokhov21830.03%730.43%
Daniel Mack547.44%14.35%
Vojtech Pavlik476.47%313.04%
Greg Kroah-Hartman101.38%28.70%
Thadeu Lima de Souza Cascardo81.10%14.35%
Anshul Garg50.69%14.35%
Eric Sesterhenn / Snakebyte10.14%14.35%
Joe Perches10.14%14.35%
Logan Gunthorpe10.14%14.35%
Total726100.00%23100.00%


static void joydev_disconnect(struct input_handle *handle) { struct joydev *joydev = handle->private; cdev_device_del(&joydev->cdev, &joydev->dev); joydev_cleanup(joydev); input_free_minor(MINOR(joydev->dev.devt)); input_unregister_handle(handle); put_device(&joydev->dev); }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Torokhov2641.27%555.56%
Linus Torvalds (pre-git)2438.10%111.11%
Logan Gunthorpe69.52%111.11%
Greg Kroah-Hartman46.35%111.11%
Vojtech Pavlik34.76%111.11%
Total63100.00%9100.00%

static const struct input_device_id joydev_ids[] = { { .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, .evbit = { BIT_MASK(EV_ABS) }, .absbit = { BIT_MASK(ABS_X) }, }, { .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, .evbit = { BIT_MASK(EV_ABS) }, .absbit = { BIT_MASK(ABS_Z) }, }, { .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, .evbit = { BIT_MASK(EV_ABS) }, .absbit = { BIT_MASK(ABS_WHEEL) }, }, { .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, .evbit = { BIT_MASK(EV_ABS) }, .absbit = { BIT_MASK(ABS_THROTTLE) }, }, { .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT, .evbit = { BIT_MASK(EV_KEY) }, .keybit = {[BIT_WORD(BTN_JOYSTICK)] = BIT_MASK(BTN_JOYSTICK) }, }, { .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT, .evbit = { BIT_MASK(EV_KEY) }, .keybit = { [BIT_WORD(BTN_GAMEPAD)] = BIT_MASK(BTN_GAMEPAD) }, }, { .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT, .evbit = { BIT_MASK(EV_KEY) }, .keybit = { [BIT_WORD(BTN_TRIGGER_HAPPY)] = BIT_MASK(BTN_TRIGGER_HAPPY) }, }, { } /* Terminating entry */ }; MODULE_DEVICE_TABLE(input, joydev_ids); static struct input_handler joydev_handler = { .event = joydev_event, .match = joydev_match, .connect = joydev_connect, .disconnect = joydev_disconnect, .legacy_minors = true, .minor = JOYDEV_MINOR_BASE, .name = "joydev", .id_table = joydev_ids, };
static int __init joydev_init(void) { return input_register_handler(&joydev_handler); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)1593.75%375.00%
Dmitry Torokhov16.25%125.00%
Total16100.00%4100.00%


static void __exit joydev_exit(void) { input_unregister_handler(&joydev_handler); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)15100.00%2100.00%
Total15100.00%2100.00%

module_init(joydev_init); module_exit(joydev_exit);

Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)153729.38%1115.28%
Dmitry Torokhov153329.31%1926.39%
Jeremy Fitzhardinge54610.44%11.39%
Stephen Kitt3867.38%22.78%
Vojtech Pavlik2544.86%811.11%
Roderick Colenbrander2274.34%11.39%
Thomas Hellstrom1863.56%11.39%
Christoph Fritz1082.06%11.39%
Raphaël Assénat841.61%11.39%
Linus Torvalds731.40%22.78%
Daniel Mack691.32%34.17%
Glenn Burkhardt450.86%11.39%
Ville Ranki290.55%11.39%
Kenneth Waters290.55%11.39%
Javier Martinez Canillas200.38%22.78%
Christoph Hellwig140.27%11.39%
Al Viro140.27%11.39%
Greg Kroah-Hartman140.27%22.78%
Oliver Neukum110.21%11.39%
Thadeu Lima de Souza Cascardo110.21%11.39%
Joe Perches80.15%11.39%
Logan Gunthorpe70.13%11.39%
Jiri Slaby60.11%11.39%
Arnd Bergmann50.10%11.39%
Anshul Garg50.10%11.39%
Alexey Dobriyan30.06%11.39%
Lucas De Marchi20.04%11.39%
Eric Sesterhenn / Snakebyte20.04%11.39%
Jonathan Corbet10.02%11.39%
Patrick Mochel10.02%11.39%
Tobias Klauser10.02%11.39%
Total5231100.00%72100.00%
Directory: drivers/input
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