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tty: Add termiox
We need a way to describe the various additional modes and flow control features that random weird hardware shows up and software such as wine wants to emulate as Windows supports them. TCGETX/TCSETX and the termiox ioctl are a SYS5 extension that we might as well adopt. This patches adds the structures and the basic ioctl interfaces when the TCGETX etc defines are added for an architecture. Drivers wishing to use this stuff need to add new methods. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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5 changed files with 87 additions and 0 deletions
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@ -579,6 +579,50 @@ static int get_termio(struct tty_struct *tty, struct termio __user *termio)
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return 0;
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}
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#ifdef TCGETX
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/**
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* set_termiox - set termiox fields if possible
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* @tty: terminal
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* @arg: termiox structure from user
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* @opt: option flags for ioctl type
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*
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* Implement the device calling points for the SYS5 termiox ioctl
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* interface in Linux
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*/
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static int set_termiox(struct tty_struct *tty, void __user *arg, int opt)
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{
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struct termiox tnew;
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struct tty_ldisc *ld;
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if (tty->termiox == NULL)
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return -EINVAL;
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if (copy_from_user(&tnew, arg, sizeof(struct termiox)))
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return -EFAULT;
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ld = tty_ldisc_ref(tty);
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if (ld != NULL) {
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if ((opt & TERMIOS_FLUSH) && ld->ops->flush_buffer)
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ld->ops->flush_buffer(tty);
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tty_ldisc_deref(ld);
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}
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if (opt & TERMIOS_WAIT) {
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tty_wait_until_sent(tty, 0);
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if (signal_pending(current))
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return -EINTR;
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}
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mutex_lock(&tty->termios_mutex);
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if (tty->ops->set_termiox)
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tty->ops->set_termiox(tty, &tnew);
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mutex_unlock(&tty->termios_mutex);
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return 0;
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}
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#endif
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static unsigned long inq_canon(struct tty_struct *tty)
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{
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int nr, head, tail;
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@ -936,6 +980,20 @@ int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
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return -EFAULT;
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return 0;
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#endif
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#ifdef TCGETX
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case TCGETX:
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if (real_tty->termiox == NULL)
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return -EINVAL;
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if (copy_to_user(p, real_tty->termiox, sizeof(struct termiox)))
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return -EFAULT;
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return 0;
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case TCSETX:
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return set_termiox(real_tty, p, 0);
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case TCSETXW:
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return set_termiox(real_tty, p, TERMIOS_WAIT);
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case TCSETXF:
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return set_termiox(real_tty, p, TERMIOS_FLUSH);
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#endif
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case TIOCGSOFTCAR:
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/* FIXME: for correctness we may need to take the termios
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lock here - review */
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@ -56,6 +56,10 @@
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#define TIOCGPTN _IOR('T', 0x30, unsigned int)
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/* Get Pty Number (of pty-mux device) */
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#define TIOCSPTLCK _IOW('T', 0x31, int) /* Lock/unlock Pty */
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#define TCGETX 0x5432 /* SYS5 TCGETX compatibility */
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#define TCSETX 0x5433
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#define TCSETXF 0x5434
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#define TCSETXW 0x5435
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#define FIONCLEX 0x5450
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#define FIOCLEX 0x5451
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@ -4,4 +4,19 @@
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#include <linux/types.h>
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#include <asm/termios.h>
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#define NFF 5
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struct termiox
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{
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__u16 x_hflag;
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__u16 x_cflag;
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__u16 x_rflag[NFF];
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__u16 x_sflag;
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};
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#define RTSXOFF 0x0001 /* RTS flow control on input */
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#define CTSXON 0x0002 /* CTS flow control on output */
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#define DTRXOFF 0x0004 /* DTR flow control on input */
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#define DSRXON 0x0008 /* DCD flow control on output */
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#endif
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@ -219,6 +219,7 @@ struct tty_struct {
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spinlock_t ctrl_lock;
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/* Termios values are protected by the termios mutex */
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struct ktermios *termios, *termios_locked;
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struct termiox *termiox; /* May be NULL for unsupported */
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char name[64];
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struct pid *pgrp; /* Protected by ctrl lock */
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struct pid *session;
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@ -180,6 +180,14 @@
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* not force errors here if they are not resizable objects (eg a serial
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* line). See tty_do_resize() if you need to wrap the standard method
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* in your own logic - the usual case.
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*
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* void (*set_termiox)(struct tty_struct *tty, struct termiox *new);
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*
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* Called when the device receives a termiox based ioctl. Passes down
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* the requested data from user space. This method will not be invoked
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* unless the tty also has a valid tty->termiox pointer.
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*
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* Optional: Called under the termios lock
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*/
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#include <linux/fs.h>
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@ -220,6 +228,7 @@ struct tty_operations {
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unsigned int set, unsigned int clear);
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int (*resize)(struct tty_struct *tty, struct tty_struct *real_tty,
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struct winsize *ws);
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int (*set_termiox)(struct tty_struct *tty, struct termiox *tnew);
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#ifdef CONFIG_CONSOLE_POLL
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int (*poll_init)(struct tty_driver *driver, int line, char *options);
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int (*poll_get_char)(struct tty_driver *driver, int line);
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