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a46877eeb2
There are two Linux ioctls which implements tcsendbreak() functionality: TCSBRK and TCSBRKP TCSBRK with non-zero parameter implements tcdrain() and with zero parameter implements tcsendbreak() for duration of 0.25s. TCSBRKP with zero parameter is same as TCSBRK and with non-zero parameter implements tcsendbreak() for duration in deciseconds specified by parameter. TCSBRKP does not have to be provided by older toolchain versions. So tcsendbreak() has to either use TCSBRK with zero parameter or TCSBRKP with any parameter. Fix code to use TCSBRKP and fallback to TCSBRK with 0. Signed-off-by: Pali Rohár <pali@kernel.org> Reviewed-by: Stefan Roese <sr@denx.de>
193 lines
3.7 KiB
C
193 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* termios fuctions to support arbitrary baudrates (on Linux)
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*
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* Copyright (c) 2021 Pali Rohár <pali@kernel.org>
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* Copyright (c) 2021 Marek Behún <marek.behun@nic.cz>
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*/
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#ifndef _TERMIOS_LINUX_H_
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#define _TERMIOS_LINUX_H_
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/*
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* We need to use raw TCGETS2/TCSETS2 or TCGETS/TCSETS ioctls with the BOTHER
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* flag in struct termios2/termios, defined in Linux headers <asm/ioctls.h>
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* (included by <sys/ioctl.h>) and <asm/termbits.h>. Since these headers
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* conflict with glibc's header file <termios.h>, it is not possible to use
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* libc's termios functions and we need to reimplement them via ioctl() calls.
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*
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* An arbitrary baudrate is supported when the macro BOTHER is defined. The
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* baudrate value itself is then stored into the c_ospeed and c_ispeed members.
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* If ioctls TCGETS2/TCSETS2 are defined and supported then these fields are
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* present in struct termios2, otherwise these fields are present in struct
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* termios.
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*
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* Note that the Bnnn constants from <termios.h> need not be compatible with Bnnn
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* constants from <asm/termbits.h>.
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*/
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#include <errno.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <asm/termbits.h>
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#if defined(BOTHER) && defined(TCGETS2)
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#define termios termios2
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#endif
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static inline int tcgetattr(int fd, struct termios *t)
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{
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#if defined(BOTHER) && defined(TCGETS2)
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return ioctl(fd, TCGETS2, t);
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#else
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return ioctl(fd, TCGETS, t);
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#endif
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}
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static inline int tcsetattr(int fd, int a, const struct termios *t)
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{
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int cmd;
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switch (a) {
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#if defined(BOTHER) && defined(TCGETS2)
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case TCSANOW:
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cmd = TCSETS2;
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break;
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case TCSADRAIN:
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cmd = TCSETSW2;
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break;
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case TCSAFLUSH:
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cmd = TCSETSF2;
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break;
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#else
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case TCSANOW:
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cmd = TCSETS;
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break;
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case TCSADRAIN:
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cmd = TCSETSW;
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break;
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case TCSAFLUSH:
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cmd = TCSETSF;
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break;
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#endif
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default:
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errno = EINVAL;
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return -1;
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}
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return ioctl(fd, cmd, t);
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}
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static inline int tcdrain(int fd)
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{
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return ioctl(fd, TCSBRK, 1);
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}
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static inline int tcflush(int fd, int q)
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{
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return ioctl(fd, TCFLSH, q);
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}
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static inline int tcsendbreak(int fd, int d)
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{
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#ifdef TCSBRKP
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return ioctl(fd, TCSBRKP, d);
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#else
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return ioctl(fd, TCSBRK, 0);
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#endif
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}
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static inline int tcflow(int fd, int a)
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{
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return ioctl(fd, TCXONC, a);
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}
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static inline pid_t tcgetsid(int fd)
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{
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pid_t sid;
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if (ioctl(fd, TIOCGSID, &sid) < 0)
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return (pid_t)-1;
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return sid;
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}
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static inline speed_t cfgetospeed(const struct termios *t)
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{
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return t->c_cflag & CBAUD;
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}
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static inline int cfsetospeed(struct termios *t, speed_t s)
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{
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if (s & ~CBAUD) {
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errno = EINVAL;
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return -1;
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}
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t->c_cflag &= ~CBAUD;
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t->c_cflag |= s;
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return 0;
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}
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#ifdef IBSHIFT
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static inline speed_t cfgetispeed(const struct termios *t)
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{
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speed_t s = (t->c_cflag >> IBSHIFT) & CBAUD;
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if (s == B0)
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return cfgetospeed(t);
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else
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return s;
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}
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static inline int cfsetispeed(struct termios *t, speed_t s)
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{
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if (s == 0)
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s = B0;
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if (s & ~CBAUD) {
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errno = EINVAL;
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return -1;
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}
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t->c_cflag &= ~(CBAUD << IBSHIFT);
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t->c_cflag |= s << IBSHIFT;
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return 0;
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}
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#else /* !IBSHIFT */
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static inline speed_t cfgetispeed(const struct termios *t)
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{
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return cfgetospeed(t);
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}
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static inline int cfsetispeed(struct termios *t, speed_t s)
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{
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return cfsetospeed(t, s);
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}
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#endif /* !IBSHIFT */
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static inline int cfsetspeed(struct termios *t, speed_t s)
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{
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if (cfsetospeed(t, s))
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return -1;
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#ifdef IBSHIFT
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if (cfsetispeed(t, s))
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return -1;
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#endif
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return 0;
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}
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static void cfmakeraw(struct termios *t)
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{
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t->c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR |
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ICRNL | IXON);
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t->c_oflag &= ~OPOST;
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t->c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
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t->c_cflag &= ~(CSIZE | PARENB);
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t->c_cflag |= CS8;
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}
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#endif /* _TERMIOS_LINUX_H_ */
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