Cleanup of nmdm device
This commit is contained in:
Julian Elischer
parent
9237b562e5
commit
9308b7002c
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=90995
@ -34,8 +34,10 @@
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*/
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/*
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* Pseudo-nulmodem Driver
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* Pseudo-nulmodem driver
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* Mighty handy for use with serial console in Vmware
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*/
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#include "opt_compat.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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@ -54,16 +56,17 @@
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MALLOC_DEFINE(M_NLMDM, "nullmodem", "nullmodem data structures");
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static void nmdmstart __P((struct tty *tp));
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static void nmdmstop __P((struct tty *tp, int rw));
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static void wakeup_other __P((struct tty *tp, int flag));
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static void nmdminit __P((int n));
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static void nmdmstart(struct tty *tp);
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static void nmdmstop(struct tty *tp, int rw);
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static void wakeup_other(struct tty *tp, int flag);
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static void nmdminit(int);
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static int nmdmshutdown(void);
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static d_open_t nmdmopen;
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static d_close_t nmdmclose;
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static d_read_t nmdmread;
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static d_write_t nmdmwrite;
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static d_ioctl_t nmdmioctl;
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static d_open_t nmdmopen;
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static d_close_t nmdmclose;
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static d_read_t nmdmread;
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static d_write_t nmdmwrite;
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static d_ioctl_t nmdmioctl;
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#define CDEV_MAJOR 18
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static struct cdevsw nmdm_cdevsw = {
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@ -82,10 +85,12 @@ static struct cdevsw nmdm_cdevsw = {
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/* flags */ D_TTY,
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};
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#define BUFSIZ 100 /* Chunk size iomoved to/from user */
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#define BUFSIZ 100 /* Chunk size iomoved to/from user */
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#define NMDM_MAX_NUM 128 /* Artificially limit # devices. */
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#define PF_STOPPED 0x10 /* user told stopped */
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struct softpart {
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struct tty nm_tty;
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struct tty nm_tty;
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dev_t dev;
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int modemsignals; /* bits defined in sys/ttycom.h */
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int gotbreak;
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@ -97,8 +102,6 @@ struct nm_softc {
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struct prison *pt_prison;
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};
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#define PF_STOPPED 0x10 /* user told stopped */
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static void
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nmdm_crossover(struct nm_softc *pti,
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struct softpart *ourpart,
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@ -150,12 +153,11 @@ nmdminit(n)
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pt->part2.nm_tty.t_stop = nmdmstop;
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}
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/*ARGSUSED*/
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/*
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* Device opened from userland
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*/
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static int
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nmdmopen(dev, flag, devtype, td)
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dev_t dev;
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int flag, devtype;
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struct thread *td;
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nmdmopen(dev_t dev, int flag, int devtype, struct thread *td)
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{
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register struct tty *tp, *tp2;
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int error;
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@ -175,11 +177,14 @@ nmdmopen(dev, flag, devtype, td)
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pair = minr >> 1;
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is_b = minr & 1;
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if (pair < 127) {
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nextdev = makedev(major(dev), (pair+pair) + 1);
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if (pair < (NMDM_MAX_NUM - 1)) {
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nextdev = makedev(major(dev), minr + 2);
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if (!nextdev->si_drv1) {
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nmdminit(pair + 1);
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}
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} else { /* Limit ourselves to 128 of them for now */
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if (pair > (NMDM_MAX_NUM - 1))
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return (ENXIO);
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}
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if (!dev->si_drv1)
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nmdminit(pair);
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@ -193,6 +198,7 @@ nmdmopen(dev, flag, devtype, td)
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else
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tp = &pti->part1.nm_tty;
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GETPARTS(tp, ourpart, otherpart);
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tp2 = &otherpart->nm_tty;
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ourpart->modemsignals |= TIOCM_LE;
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@ -254,11 +260,11 @@ nmdmopen(dev, flag, devtype, td)
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return (error);
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}
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/*
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* Device closed again
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*/
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static int
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nmdmclose(dev, flag, mode, td)
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dev_t dev;
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int flag, mode;
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struct thread *td;
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nmdmclose(dev_t dev, int flag, int mode, struct thread *td)
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{
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register struct tty *tp, *tp2;
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int err;
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@ -294,11 +300,11 @@ nmdmclose(dev, flag, mode, td)
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return (err);
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}
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/*
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* handle read(2) request from userland
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*/
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static int
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nmdmread(dev, uio, flag)
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dev_t dev;
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struct uio *uio;
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int flag;
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nmdmread(dev_t dev, struct uio *uio, int flag)
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{
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int error = 0;
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struct tty *tp, *tp2;
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@ -333,10 +339,7 @@ nmdmread(dev, uio, flag)
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* indirectly, when tty driver calls nmdmstart.
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*/
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static int
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nmdmwrite(dev, uio, flag)
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dev_t dev;
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struct uio *uio;
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int flag;
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nmdmwrite(dev_t dev, struct uio *uio, int flag)
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{
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register u_char *cp = 0;
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register int cc = 0;
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@ -430,8 +433,7 @@ nmdmwrite(dev, uio, flag)
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* Wake up process selecting or sleeping for input from controlling tty.
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*/
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static void
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nmdmstart(tp)
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struct tty *tp;
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nmdmstart(struct tty *tp)
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{
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register struct nm_softc *pti = tp->t_dev->si_drv1;
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@ -443,9 +445,7 @@ nmdmstart(tp)
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/* Wakes up the OTHER tty;*/
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static void
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wakeup_other(tp, flag)
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struct tty *tp;
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int flag;
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wakeup_other(struct tty *tp, int flag)
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{
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struct softpart *ourpart, *otherpart;
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@ -460,10 +460,11 @@ wakeup_other(tp, flag)
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}
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}
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/*
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* stopped output on tty, called when device is closed
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*/
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static void
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nmdmstop(tp, flush)
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register struct tty *tp;
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int flush;
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nmdmstop(register struct tty *tp, int flush)
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{
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struct nm_softc *pti = tp->t_dev->si_drv1;
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int flag;
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@ -483,14 +484,11 @@ nmdmstop(tp, flush)
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wakeup_other(tp, flag);
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}
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/*ARGSUSED*/
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/*
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* handle ioctl(2) request from userland
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*/
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static int
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nmdmioctl(dev, cmd, data, flag, td)
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dev_t dev;
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u_long cmd;
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caddr_t data;
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int flag;
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struct thread *td;
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nmdmioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td)
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{
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register struct tty *tp = dev->si_tty;
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struct nm_softc *pti = dev->si_drv1;
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@ -538,6 +536,7 @@ nmdmioctl(dev, cmd, data, flag, td)
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*(int *)data = 0;
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break;
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case TIOCTIMESTAMP:
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/* FALLTHROUGH */
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case TIOCDCDTIMESTAMP:
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default:
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splx(s);
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@ -552,9 +551,8 @@ nmdmioctl(dev, cmd, data, flag, td)
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}
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static void
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nmdm_crossover(struct nm_softc *pti,
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struct softpart *ourpart,
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struct softpart *otherpart)
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nmdm_crossover(struct nm_softc *pti, struct softpart *ourpart,
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struct softpart *otherpart)
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{
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otherpart->modemsignals &= ~(TIOCM_CTS|TIOCM_CAR);
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if (ourpart->modemsignals & TIOCM_RTS)
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@ -563,17 +561,58 @@ nmdm_crossover(struct nm_softc *pti,
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otherpart->modemsignals |= TIOCM_CAR;
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}
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static void nmdm_drvinit __P((void *unused));
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static void
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nmdm_drvinit(unused)
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void *unused;
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/*
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* Module handling
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*/
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static int
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nmdm_modevent(module_t mod, int type, void *data)
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{
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/* XXX: Gross hack for DEVFS */
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/* XXX: Yes, very gross. Should be a _clone methind instead */
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nmdminit(0);
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int error = 0;
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switch(type) {
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case MOD_LOAD: /* start with 4 of them */
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nmdminit(0);
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nmdminit(1);
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nmdminit(2);
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nmdminit(3);
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break;
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case MOD_SHUTDOWN:
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/* FALLTHROUGH */
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case MOD_UNLOAD:
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nmdmshutdown();
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break;
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default:
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error = EOPNOTSUPP;
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}
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return (error);
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}
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SYSINIT(nmdmdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,nmdm_drvinit,NULL)
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/*
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* Handle teardown of device
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*/
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static int
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nmdmshutdown(void)
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{
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int i;
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dev_t nextdev1;
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dev_t nextdev2;
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void * ptr1;
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for(i = 0;( i < NMDM_MAX_NUM) ;i++) {
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nextdev1 = makedev(CDEV_MAJOR, (i+i) );
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nextdev2 = makedev(CDEV_MAJOR, (i+i) + 1);
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ptr1 = nextdev1->si_drv1;
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if (ptr1) {
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revoke_and_destroy_dev(nextdev1);
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revoke_and_destroy_dev(nextdev2);
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free(ptr1, M_NLMDM);
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} else {
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freedev(nextdev1);
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freedev(nextdev2);
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}
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}
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return(0);
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}
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DEV_MODULE(nmdm, nmdm_modevent, NULL);
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