Release 4.11 drivers/input/serio/serport.c
/*
* Input device TTY line discipline
*
* Copyright (c) 1999-2002 Vojtech Pavlik
*
* This is a module that converts a tty line into a much simpler
* 'serial io port' abstraction that the input device drivers use.
*/
/*
* 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.
*/
#include <linux/uaccess.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/serio.h>
#include <linux/tty.h>
#include <linux/compat.h>
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Input device TTY line discipline");
MODULE_LICENSE("GPL");
MODULE_ALIAS_LDISC(N_MOUSE);
#define SERPORT_BUSY 1
#define SERPORT_ACTIVE 2
#define SERPORT_DEAD 3
struct serport {
struct tty_struct *tty;
wait_queue_head_t wait;
struct serio *serio;
struct serio_device_id id;
spinlock_t lock;
unsigned long flags;
};
/*
* Callback functions from the serio code.
*/
static int serport_serio_write(struct serio *serio, unsigned char data)
{
struct serport *serport = serio->port_data;
return -(serport->tty->ops->write(serport->tty, &data, 1) != 1);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 45 | 93.75% | 1 | 25.00% |
| Dmitry Torokhov | 1 | 2.08% | 1 | 25.00% |
| Al Viro | 1 | 2.08% | 1 | 25.00% |
| Alan Cox | 1 | 2.08% | 1 | 25.00% |
| Total | 48 | 100.00% | 4 | 100.00% |
static int serport_serio_open(struct serio *serio)
{
struct serport *serport = serio->port_data;
unsigned long flags;
spin_lock_irqsave(&serport->lock, flags);
set_bit(SERPORT_ACTIVE, &serport->flags);
spin_unlock_irqrestore(&serport->lock, flags);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitry Torokhov | 57 | 100.00% | 1 | 100.00% |
| Total | 57 | 100.00% | 1 | 100.00% |
static void serport_serio_close(struct serio *serio)
{
struct serport *serport = serio->port_data;
unsigned long flags;
spin_lock_irqsave(&serport->lock, flags);
clear_bit(SERPORT_ACTIVE, &serport->flags);
spin_unlock_irqrestore(&serport->lock, flags);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitry Torokhov | 32 | 59.26% | 3 | 60.00% |
| Linus Torvalds (pre-git) | 19 | 35.19% | 1 | 20.00% |
| Vojtech Pavlik | 3 | 5.56% | 1 | 20.00% |
| Total | 54 | 100.00% | 5 | 100.00% |
/*
* serport_ldisc_open() is the routine that is called upon setting our line
* discipline on a tty. It prepares the serio struct.
*/
static int serport_ldisc_open(struct tty_struct *tty)
{
struct serport *serport;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
serport = kzalloc(sizeof(struct serport), GFP_KERNEL);
if (!serport)
return -ENOMEM;
serport->tty = tty;
spin_lock_init(&serport->lock);
init_waitqueue_head(&serport->wait);
tty->disc_data = serport;
tty->receive_room = 256;
set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 36 | 37.11% | 1 | 12.50% |
| Dmitry Torokhov | 34 | 35.05% | 2 | 25.00% |
| Vojtech Pavlik | 15 | 15.46% | 2 | 25.00% |
| Alan Cox | 6 | 6.19% | 1 | 12.50% |
| Christoph Hellwig | 5 | 5.15% | 1 | 12.50% |
| Pekka J Enberg | 1 | 1.03% | 1 | 12.50% |
| Total | 97 | 100.00% | 8 | 100.00% |
/*
* serport_ldisc_close() is the opposite of serport_ldisc_open()
*/
static void serport_ldisc_close(struct tty_struct *tty)
{
struct serport *serport = (struct serport *) tty->disc_data;
kfree(serport);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 30 | 100.00% | 1 | 100.00% |
| Total | 30 | 100.00% | 1 | 100.00% |
/*
* serport_ldisc_receive() is called by the low level tty driver when characters
* are ready for us. We forward the characters and flags, one by one to the
* 'interrupt' routine.
*/
static void serport_ldisc_receive(struct tty_struct *tty, const unsigned char *cp, char *fp, int count)
{
struct serport *serport = (struct serport*) tty->disc_data;
unsigned long flags;
unsigned int ch_flags = 0;
int i;
spin_lock_irqsave(&serport->lock, flags);
if (!test_bit(SERPORT_ACTIVE, &serport->flags))
goto out;
for (i = 0; i < count; i++) {
if (fp) {
switch (fp[i]) {
case TTY_FRAME:
ch_flags = SERIO_FRAME;
break;
case TTY_PARITY:
ch_flags = SERIO_PARITY;
break;
default:
ch_flags = 0;
break;
}
}
serio_interrupt(serport->serio, cp[i], ch_flags);
}
out:
spin_unlock_irqrestore(&serport->lock, flags);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 65 | 41.94% | 1 | 16.67% |
| Dmitry Torokhov | 42 | 27.10% | 1 | 16.67% |
| David Engraf | 38 | 24.52% | 1 | 16.67% |
| Peter Hurley | 8 | 5.16% | 1 | 16.67% |
| Linus Torvalds | 1 | 0.65% | 1 | 16.67% |
| Vojtech Pavlik | 1 | 0.65% | 1 | 16.67% |
| Total | 155 | 100.00% | 6 | 100.00% |
/*
* serport_ldisc_read() just waits indefinitely if everything goes well.
* However, when the serio driver closes the serio port, it finishes,
* returning 0 characters.
*/
static ssize_t serport_ldisc_read(struct tty_struct * tty, struct file * file, unsigned char __user * buf, size_t nr)
{
struct serport *serport = (struct serport*) tty->disc_data;
struct serio *serio;
if (test_and_set_bit(SERPORT_BUSY, &serport->flags))
return -EBUSY;
serport->serio = serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
if (!serio)
return -ENOMEM;
strlcpy(serio->name, "Serial port", sizeof(serio->name));
snprintf(serio->phys, sizeof(serio->phys), "%s/serio0", tty_name(tty));
serio->id = serport->id;
serio->id.type = SERIO_RS232;
serio->write = serport_serio_write;
serio->open = serport_serio_open;
serio->close = serport_serio_close;
serio->port_data = serport;
serio->dev.parent = tty->dev;
serio_register_port(serport->serio);
printk(KERN_INFO "serio: Serial port %s\n", tty_name(tty));
wait_event_interruptible(serport->wait, test_bit(SERPORT_DEAD, &serport->flags));
serio_unregister_port(serport->serio);
serport->serio = NULL;
clear_bit(SERPORT_DEAD, &serport->flags);
clear_bit(SERPORT_BUSY, &serport->flags);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitry Torokhov | 130 | 53.28% | 1 | 12.50% |
| Linus Torvalds (pre-git) | 74 | 30.33% | 1 | 12.50% |
| Vojtech Pavlik | 23 | 9.43% | 2 | 25.00% |
| Dmitry Baryshkov | 10 | 4.10% | 1 | 12.50% |
| Linus Torvalds | 5 | 2.05% | 1 | 12.50% |
| Al Viro | 1 | 0.41% | 1 | 12.50% |
| Pekka J Enberg | 1 | 0.41% | 1 | 12.50% |
| Total | 244 | 100.00% | 8 | 100.00% |
static void serport_set_type(struct tty_struct *tty, unsigned long type)
{
struct serport *serport = tty->disc_data;
serport->id.proto = type & 0x000000ff;
serport->id.id = (type & 0x0000ff00) >> 8;
serport->id.extra = (type & 0x00ff0000) >> 16;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitry Torokhov | 38 | 61.29% | 2 | 50.00% |
| Linus Torvalds (pre-git) | 20 | 32.26% | 1 | 25.00% |
| John Sung | 4 | 6.45% | 1 | 25.00% |
| Total | 62 | 100.00% | 4 | 100.00% |
/*
* serport_ldisc_ioctl() allows to set the port protocol, and device ID
*/
static int serport_ldisc_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{
if (cmd == SPIOCSTYPE) {
unsigned long type;
if (get_user(type, (unsigned long __user *) arg))
return -EFAULT;
serport_set_type(tty, type);
return 0;
}
return -EINVAL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| John Sung | 60 | 86.96% | 1 | 33.33% |
| Linus Torvalds (pre-git) | 6 | 8.70% | 1 | 33.33% |
| Dmitry Torokhov | 3 | 4.35% | 1 | 33.33% |
| Total | 69 | 100.00% | 3 | 100.00% |
#ifdef CONFIG_COMPAT
#define COMPAT_SPIOCSTYPE _IOW('q', 0x01, compat_ulong_t)
static long serport_ldisc_compat_ioctl(struct tty_struct *tty,
struct file *file,
unsigned int cmd, unsigned long arg)
{
if (cmd == COMPAT_SPIOCSTYPE) {
void __user *uarg = compat_ptr(arg);
compat_ulong_t compat_type;
if (get_user(compat_type, (compat_ulong_t __user *)uarg))
return -EFAULT;
serport_set_type(tty, compat_type);
return 0;
}
return -EINVAL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| John Sung | 77 | 100.00% | 1 | 100.00% |
| Total | 77 | 100.00% | 1 | 100.00% |
#endif
static int serport_ldisc_hangup(struct tty_struct *tty)
{
struct serport *serport = (struct serport *) tty->disc_data;
unsigned long flags;
spin_lock_irqsave(&serport->lock, flags);
set_bit(SERPORT_DEAD, &serport->flags);
spin_unlock_irqrestore(&serport->lock, flags);
wake_up_interruptible(&serport->wait);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Hans Verkuil | 70 | 100.00% | 1 | 100.00% |
| Total | 70 | 100.00% | 1 | 100.00% |
static void serport_ldisc_write_wakeup(struct tty_struct * tty)
{
struct serport *serport = (struct serport *) tty->disc_data;
unsigned long flags;
spin_lock_irqsave(&serport->lock, flags);
if (test_bit(SERPORT_ACTIVE, &serport->flags))
serio_drv_write_wakeup(serport->serio);
spin_unlock_irqrestore(&serport->lock, flags);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dmitry Torokhov | 39 | 57.35% | 2 | 66.67% |
| Vojtech Pavlik | 29 | 42.65% | 1 | 33.33% |
| Total | 68 | 100.00% | 3 | 100.00% |
/*
* The line discipline structure.
*/
static struct tty_ldisc_ops serport_ldisc = {
.owner = THIS_MODULE,
.name = "input",
.open = serport_ldisc_open,
.close = serport_ldisc_close,
.read = serport_ldisc_read,
.ioctl = serport_ldisc_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = serport_ldisc_compat_ioctl,
#endif
.receive_buf = serport_ldisc_receive,
.hangup = serport_ldisc_hangup,
.write_wakeup = serport_ldisc_write_wakeup
};
/*
* The functions for insering/removing us as a module.
*/
static int __init serport_init(void)
{
int retval;
retval = tty_register_ldisc(N_MOUSE, &serport_ldisc);
if (retval)
printk(KERN_ERR "serport.c: Error registering line discipline.\n");
return retval;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 24 | 68.57% | 1 | 33.33% |
| Randy Dunlap | 10 | 28.57% | 1 | 33.33% |
| Christoph Hellwig | 1 | 2.86% | 1 | 33.33% |
| Total | 35 | 100.00% | 3 | 100.00% |
static void __exit serport_exit(void)
{
tty_unregister_ldisc(N_MOUSE);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 12 | 85.71% | 1 | 33.33% |
| Christoph Hellwig | 1 | 7.14% | 1 | 33.33% |
| Alexey Dobriyan | 1 | 7.14% | 1 | 33.33% |
| Total | 14 | 100.00% | 3 | 100.00% |
module_init(serport_init);
module_exit(serport_exit);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 405 | 32.17% | 1 | 3.12% |
| Dmitry Torokhov | 393 | 31.22% | 6 | 18.75% |
| John Sung | 164 | 13.03% | 1 | 3.12% |
| Vojtech Pavlik | 114 | 9.05% | 5 | 15.62% |
| Hans Verkuil | 75 | 5.96% | 1 | 3.12% |
| David Engraf | 39 | 3.10% | 1 | 3.12% |
| Christoph Hellwig | 12 | 0.95% | 1 | 3.12% |
| Randy Dunlap | 10 | 0.79% | 1 | 3.12% |
| Dmitry Baryshkov | 10 | 0.79% | 1 | 3.12% |
| Linus Torvalds | 8 | 0.64% | 4 | 12.50% |
| Alan Cox | 8 | 0.64% | 3 | 9.38% |
| Peter Hurley | 8 | 0.64% | 1 | 3.12% |
| Andrew Morton | 5 | 0.40% | 1 | 3.12% |
| Alexey Dobriyan | 4 | 0.32% | 2 | 6.25% |
| Pekka J Enberg | 2 | 0.16% | 1 | 3.12% |
| Al Viro | 2 | 0.16% | 2 | 6.25% |
| Total | 1259 | 100.00% | 32 | 100.00% |
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