Release 4.11 drivers/input/mousedev.c
/*
* Input driver to ExplorerPS/2 device driver module.
*
* Copyright (c) 1999-2002 Vojtech Pavlik
* Copyright (c) 2004 Dmitry Torokhov
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#define MOUSEDEV_MINOR_BASE 32
#define MOUSEDEV_MINORS 31
#define MOUSEDEV_MIX 63
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/random.h>
#include <linux/major.h>
#include <linux/device.h>
#include <linux/cdev.h>
#include <linux/kernel.h>
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces");
MODULE_LICENSE("GPL");
#ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X
#define CONFIG_INPUT_MOUSEDEV_SCREEN_X 1024
#endif
#ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y
#define CONFIG_INPUT_MOUSEDEV_SCREEN_Y 768
#endif
static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X;
module_param(xres, uint, 0644);
MODULE_PARM_DESC(xres, "Horizontal screen resolution");
static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;
module_param(yres, uint, 0644);
MODULE_PARM_DESC(yres, "Vertical screen resolution");
static unsigned tap_time = 200;
module_param(tap_time, uint, 0644);
MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)");
struct mousedev_hw_data {
int dx, dy, dz;
int x, y;
int abs_event;
unsigned long buttons;
};
struct mousedev {
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 list_head mixdev_node;
bool opened_by_mixdev;
struct mousedev_hw_data packet;
unsigned int pkt_count;
int old_x[4], old_y[4];
int frac_dx, frac_dy;
unsigned long touch;
int (*open_device)(struct mousedev *mousedev);
void (*close_device)(struct mousedev *mousedev);
};
enum mousedev_emul {
MOUSEDEV_EMUL_PS2,
MOUSEDEV_EMUL_IMPS,
MOUSEDEV_EMUL_EXPS
};
struct mousedev_motion {
int dx, dy, dz;
unsigned long buttons;
};
#define PACKET_QUEUE_LEN 16
struct mousedev_client {
struct fasync_struct *fasync;
struct mousedev *mousedev;
struct list_head node;
struct mousedev_motion packets[PACKET_QUEUE_LEN];
unsigned int head, tail;
spinlock_t packet_lock;
int pos_x, pos_y;
signed char ps2[6];
unsigned char ready, buffer, bufsiz;
unsigned char imexseq, impsseq;
enum mousedev_emul mode;
unsigned long last_buttons;
};
#define MOUSEDEV_SEQ_LEN 6
static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
static struct mousedev *mousedev_mix;
static LIST_HEAD(mousedev_mix_list);
#define fx(i) (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
#define fy(i) (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])
static void mousedev_touchpad_event(struct input_dev *dev,
struct mousedev *mousedev,
unsigned int code, int value)
{
int size, tmp;
enum { FRACTION_DENOM = 128 };
switch (code) {
case ABS_X:
fx(0) = value;
if (mousedev->touch && mousedev->pkt_count >= 2) {
size = input_abs_get_max(dev, ABS_X) -
input_abs_get_min(dev, ABS_X);
if (size == 0)
size = 256 * 2;
tmp = ((value - fx(2)) * 256 * FRACTION_DENOM) / size;
tmp += mousedev->frac_dx;
mousedev->packet.dx = tmp / FRACTION_DENOM;
mousedev->frac_dx =
tmp - mousedev->packet.dx * FRACTION_DENOM;
}
break;
case ABS_Y:
fy(0) = value;
if (mousedev->touch && mousedev->pkt_count >= 2) {
/* use X size for ABS_Y to keep the same scale */
size = input_abs_get_max(dev, ABS_X) -
input_abs_get_min(dev, ABS_X);
if (size == 0)
size = 256 * 2;
tmp = -((value - fy(2)) * 256 * FRACTION_DENOM) / size;
tmp += mousedev->frac_dy;
mousedev->packet.dy = tmp / FRACTION_DENOM;
mousedev->frac_dy = tmp -
mousedev->packet.dy * FRACTION_DENOM;
}
break;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Peter Osterlund | 126 | 51.01% | 3 | 33.33% |
| Dmitry Torokhov | 53 | 21.46% | 2 | 22.22% |
| Andrew Morton | 36 | 14.57% | 1 | 11.11% |
| Linus Torvalds (pre-git) | 15 | 6.07% | 1 | 11.11% |
| Daniel Mack | 13 | 5.26% | 1 | 11.11% |
| Christoph Fritz | 4 | 1.62% | 1 | 11.11% |
| Total | 247 | 100.00% | 9 | 100.00% |
static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev,
unsigned int code, int value)
{
int min, max, size;
switch (code) {
case ABS_X:
min = input_abs_get_min(dev, ABS_X);
max = input_abs_get_max(dev, ABS_X);
size = max - min;
if (size == 0)
size = xres ? : 1;
value = clamp(value, min, max);
mousedev->packet.x = ((value - min) * xres) / size;
mousedev->packet.abs_event = 1;
break;
case ABS_Y:
min = input_abs_get_min(dev, ABS_Y);
max = input_abs_get_max(dev, ABS_Y);
size = max - min;
if (size == 0)
size = yres ? : 1;
value = clamp(value, min, max);
mousedev->packet.y = yres - ((value - min) * yres) / size;
mousedev->packet.abs_event = 1;
break;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitry Torokhov | 105 | 54.12% | 3 | 27.27% |
| Daniel Mack | 56 | 28.87% | 1 | 9.09% |
| Linus Torvalds (pre-git) | 16 | 8.25% | 2 | 18.18% |
| Vojtech Pavlik | 10 | 5.15% | 2 | 18.18% |
| Hans Petter Selasky | 4 | 2.06% | 1 | 9.09% |
| Andrew Morton | 2 | 1.03% | 1 | 9.09% |
| Peter Osterlund | 1 | 0.52% | 1 | 9.09% |
| Total | 194 | 100.00% | 11 | 100.00% |
static void mousedev_rel_event(struct mousedev *mousedev,
unsigned int code, int value)
{
switch (code) {
case REL_X:
mousedev->packet.dx += value;
break;
case REL_Y:
mousedev->packet.dy -= value;
break;
case REL_WHEEL:
mousedev->packet.dz -= value;
break;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitry Torokhov | 46 | 76.67% | 1 | 50.00% |
| Peter Osterlund | 14 | 23.33% | 1 | 50.00% |
| Total | 60 | 100.00% | 2 | 100.00% |
static void mousedev_key_event(struct mousedev *mousedev,
unsigned int code, int value)
{
int index;
switch (code) {
case BTN_TOUCH:
case BTN_0:
case BTN_LEFT: index = 0; break;
case BTN_STYLUS:
case BTN_1:
case BTN_RIGHT: index = 1; break;
case BTN_2:
case BTN_FORWARD:
case BTN_STYLUS2:
case BTN_MIDDLE: index = 2; break;
case BTN_3:
case BTN_BACK:
case BTN_SIDE: index = 3; break;
case BTN_4:
case BTN_EXTRA: index = 4; break;
default: return;
}
if (value) {
set_bit(index, &mousedev->packet.buttons);
set_bit(index, &mousedev_mix->packet.buttons);
} else {
clear_bit(index, &mousedev->packet.buttons);
clear_bit(index, &mousedev_mix->packet.buttons);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitry Torokhov | 144 | 92.31% | 3 | 60.00% |
| Peter Osterlund | 9 | 5.77% | 1 | 20.00% |
| Márton Németh | 3 | 1.92% | 1 | 20.00% |
| Total | 156 | 100.00% | 5 | 100.00% |
static void mousedev_notify_readers(struct mousedev *mousedev,
struct mousedev_hw_data *packet)
{
struct mousedev_client *client;
struct mousedev_motion *p;
unsigned int new_head;
int wake_readers = 0;
rcu_read_lock();
list_for_each_entry_rcu(client, &mousedev->client_list, node) {
/* Just acquire the lock, interrupts already disabled */
spin_lock(&client->packet_lock);
p = &client->packets[client->head];
if (client->ready && p->buttons != mousedev->packet.buttons) {
new_head = (client->head + 1) % PACKET_QUEUE_LEN;
if (new_head != client->tail) {
p = &client->packets[client->head = new_head];
memset(p, 0, sizeof(struct mousedev_motion));
}
}
if (packet->abs_event) {
p->dx += packet->x - client->pos_x;
p->dy += packet->y - client->pos_y;
client->pos_x = packet->x;
client->pos_y = packet->y;
}
client->pos_x += packet->dx;
client->pos_x = client->pos_x < 0 ?
0 : (client->pos_x >= xres ? xres : client->pos_x);
client->pos_y += packet->dy;
client->pos_y = client->pos_y < 0 ?
0 : (client->pos_y >= yres ? yres : client->pos_y);
p->dx += packet->dx;
p->dy += packet->dy;
p->dz += packet->dz;
p->buttons = mousedev->packet.buttons;
if (p->dx || p->dy || p->dz ||
p->buttons != client->last_buttons)
client->ready = 1;
spin_unlock(&client->packet_lock);
if (client->ready) {
kill_fasync(&client->fasync, SIGIO, POLL_IN);
wake_readers = 1;
}
}
rcu_read_unlock();
if (wake_readers)
wake_up_interruptible(&mousedev->wait);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitry Torokhov | 320 | 88.64% | 7 | 77.78% |
| Pavel Machek | 29 | 8.03% | 1 | 11.11% |
| Peter Osterlund | 12 | 3.32% | 1 | 11.11% |
| Total | 361 | 100.00% | 9 | 100.00% |
static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)
{
if (!value) {
if (mousedev->touch &&
time_before(jiffies,
mousedev->touch + msecs_to_jiffies(tap_time))) {
/*
* Toggle left button to emulate tap.
* We rely on the fact that mousedev_mix always has 0
* motion packet so we won't mess current position.
*/
set_bit(0, &mousedev->packet.buttons);
set_bit(0, &mousedev_mix->packet.buttons);
mousedev_notify_readers(mousedev, &mousedev_mix->packet);
mousedev_notify_readers(mousedev_mix,
&mousedev_mix->packet);
clear_bit(0, &mousedev->packet.buttons);
clear_bit(0, &mousedev_mix->packet.buttons);
}
mousedev->touch = mousedev->pkt_count = 0;
mousedev->frac_dx = 0;
mousedev->frac_dy = 0;
} else if (!mousedev->touch)
mousedev->touch = jiffies;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitry Torokhov | 128 | 86.49% | 4 | 66.67% |
| Peter Osterlund | 20 | 13.51% | 2 | 33.33% |
| Total | 148 | 100.00% | 6 | 100.00% |
static void mousedev_event(struct input_handle *handle,
unsigned int type, unsigned int code, int value)
{
struct mousedev *mousedev = handle->private;
switch (type) {
case EV_ABS:
/* Ignore joysticks */
if (test_bit(BTN_TRIGGER, handle->dev->keybit))
return;
if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
mousedev_touchpad_event(handle->dev,
mousedev, code, value);
else
mousedev_abs_event(handle->dev, mousedev, code, value);
break;
case EV_REL:
mousedev_rel_event(mousedev, code, value);
break;
case EV_KEY:
if (value != 2) {
if (code == BTN_TOUCH &&
test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
mousedev_touchpad_touch(mousedev, value);
else
mousedev_key_event(mousedev, code, value);
}
break;
case EV_SYN:
if (code == SYN_REPORT) {
if (mousedev->touch) {
mousedev->pkt_count++;
/*
* Input system eats duplicate events,
* but we need all of them to do correct
* averaging so apply present one forward
*/
fx(0) = fx(1);
fy(0) = fy(1);
}
mousedev_notify_readers(mousedev, &mousedev->packet);
mousedev_notify_readers(mousedev_mix, &mousedev->packet);
mousedev->packet.dx = mousedev->packet.dy =
mousedev->packet.dz = 0;
mousedev->packet.abs_event = 0;
}
break;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitry Torokhov | 138 | 55.42% | 5 | 35.71% |
| Linus Torvalds (pre-git) | 35 | 14.06% | 3 | 21.43% |
| Andrew Morton | 34 | 13.65% | 2 | 14.29% |
| Peter Osterlund | 21 | 8.43% | 2 | 14.29% |
| Vojtech Pavlik | 21 | 8.43% | 2 | 14.29% |
| Total | 249 | 100.00% | 14 | 100.00% |
static int mousedev_fasync(int fd, struct file *file, int on)
{
struct mousedev_client *client = file->private_data;
return fasync_helper(fd, file, on, &client->fasync);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 37 | 90.24% | 1 | 33.33% |
| Dmitry Torokhov | 3 | 7.32% | 1 | 33.33% |
| Jonathan Corbet | 1 | 2.44% | 1 | 33.33% |
| Total | 41 | 100.00% | 3 | 100.00% |
static void mousedev_free(struct device *dev)
{
struct mousedev *mousedev = container_of(dev, struct mousedev, dev);
input_put_device(mousedev->handle.dev);
kfree(mousedev);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitry Torokhov | 26 | 65.00% | 2 | 66.67% |
| Christoph Hellwig | 14 | 35.00% | 1 | 33.33% |
| Total | 40 | 100.00% | 3 | 100.00% |
static int mousedev_open_device(struct mousedev *mousedev)
{
int retval;
retval = mutex_lock_interruptible(&mousedev->mutex);
if (retval)
return retval;
if (!mousedev->exist)
retval = -ENODEV;
else if (!mousedev->open++) {
retval = input_open_device(&mousedev->handle);
if (retval)
mousedev->open--;
}
mutex_unlock(&mousedev->mutex);
return retval;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitry Torokhov | 55 | 65.48% | 3 | 60.00% |
| Christoph Hellwig | 18 | 21.43% | 1 | 20.00% |
| Oliver Neukum | 11 | 13.10% | 1 | 20.00% |
| Total | 84 | 100.00% | 5 | 100.00% |
static void mousedev_close_device(struct mousedev *mousedev)
{
mutex_lock(&mousedev->mutex);
if (mousedev->exist && !--mousedev->open)
input_close_device(&mousedev->handle);
mutex_unlock(&mousedev->mutex);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitry Torokhov | 25 | 53.19% | 3 | 50.00% |
| Linus Torvalds (pre-git) | 22 | 46.81% | 3 | 50.00% |
| Total | 47 | 100.00% | 6 | 100.00% |
/*
* Open all available devices so they can all be multiplexed in one.
* stream. Note that this function is called with mousedev_mix->mutex
* held.
*/
static int mixdev_open_devices(struct mousedev *mixdev)
{
int error;
error = mutex_lock_interruptible(&mixdev->mutex);
if (error)
return error;
if (!mixdev->open++) {
struct mousedev *mousedev;
list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
if (!mousedev->opened_by_mixdev) {
if (mousedev_open_device(mousedev))
continue;
mousedev->opened_by_mixdev = true;
}
}
}
mutex_unlock(&mixdev->mutex);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitry Torokhov | 77 | 85.56% | 5 | 71.43% |
| Christoph Hellwig | 8 | 8.89% | 1 | 14.29% |
| Linus Torvalds (pre-git) | 5 | 5.56% | 1 | 14.29% |
| Total | 90 | 100.00% | 7 | 100.00% |
/*
* Close all devices that were opened as part of multiplexed
* device. Note that this function is called with mousedev_mix->mutex
* held.
*/
static void mixdev_close_devices(struct mousedev *mixdev)
{
mutex_lock(&mixdev->mutex);
if (!--mixdev->open) {
struct mousedev *mousedev;
list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
if (mousedev->opened_by_mixdev) {
mousedev->opened_by_mixdev = false;
mousedev_close_device(mousedev);
}
}
}
mutex_unlock(&mixdev->mutex);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitry Torokhov | 65 | 91.55% | 5 | 83.33% |
| Christoph Hellwig | 6 | 8.45% | 1 | 16.67% |
| Total | 71 | 100.00% | 6 | 100.00% |
static void mousedev_attach_client(struct mousedev *mousedev,
struct mousedev_client *client)
{
spin_lock(&mousedev->client_lock);
list_add_tail_rcu(&client->node, &mousedev->client_list);
spin_unlock(&mousedev->client_lock);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitry Torokhov | 28 | 62.22% | 2 | 40.00% |
| Linus Torvalds (pre-git) | 14 | 31.11% | 2 | 40.00% |
| Vojtech Pavlik | 3 | 6.67% | 1 | 20.00% |
| Total | 45 | 100.00% | 5 | 100.00% |
static void mousedev_detach_client(struct mousedev *mousedev,
struct mousedev_client *client)
{
spin_lock(&mousedev->client_lock);
list_del_rcu(&client->node);
spin_unlock(&mousedev->client_lock);
synchronize_rcu();
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitry Torokhov | 37 | 86.05% | 3 | 60.00% |
| Linus Torvalds (pre-git) | 6 | 13.95% | 2 | 40.00% |
| Total | 43 | 100.00% | 5 | 100.00% |
static int mousedev_release(struct inode *inode, struct file *file)
{
struct mousedev_client *client = file->private_data;
struct mousedev *mousedev = client->mousedev;
mousedev_detach_client(mousedev, client);
kfree(client);
mousedev->close_device(mousedev);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitry Torokhov | 50 | 89.29% | 2 | 50.00% |
| Linus Torvalds (pre-git) | 6 | 10.71% | 2 | 50.00% |
| Total | 56 | 100.00% | 4 | 100.00% |
static int mousedev_open(struct inode *inode, struct file *file)
{
struct mousedev_client *client;
struct mousedev *mousedev;
int error;
#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
if (imajor(inode) == MISC_MAJOR)
mousedev = mousedev_mix;
else
#endif
mousedev = container_of(inode->i_cdev, struct mousedev, cdev);
client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL);
if (!client)
return -ENOMEM;
spin_lock_init(&client->packet_lock);
client->pos_x = xres / 2;
client->pos_y = yres / 2;
client->mousedev = mousedev;
mousedev_attach_client(mousedev, client);
error = mousedev->open_device(mousedev);
if (error)
goto err_free_client;
file->private_data = client;
nonseekable_open(inode, file);
return 0;
err_free_client:
mousedev_detach_client(mousedev, client);
kfree(client);
return error;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitry Torokhov | 95 | 55.88% | 9 | 52.94% |
| Linus Torvalds (pre-git) | 49 | 28.82% | 3 | 17.65% |
| Vojtech Pavlik | 24 | 14.12% | 3 | 17.65% |
| Eric Sesterhenn / Snakebyte | 1 | 0.59% | 1 | 5.88% |
| Al Viro | 1 | 0.59% | 1 | 5.88% |
| Total | 170 | 100.00% | 17 | 100.00% |
static inline int mousedev_limit_delta(int delta, int limit)
{
return delta > limit ? limit : (delta < -limit ? -limit : delta);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitry Torokhov | 32 | 100.00% | 1 | 100.00% |
| Total | 32 | 100.00% | 1 | 100.00% |
static void mousedev_packet(struct mousedev_client *client,
signed char *ps2_data)
{
struct mousedev_motion *p = &client->packets[client->tail];
ps2_data[0] = 0x08 |
((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
ps2_data[1] = mousedev_limit_delta(p->dx, 127);
ps2_data[2] = mousedev_limit_delta(p->dy, 127);
p->dx -= ps2_data[1];
p->dy -= ps2_data[2];
switch (client->mode) {
case MOUSEDEV_EMUL_EXPS:
ps2_data[3] = mousedev_limit_delta(p->dz, 7);
p->dz