5e176f9a97
create a skeleton device driver. one for a real device and the other for a pseudo device. they each take one argument which is the name (prefix) for the driver. they add the new file to the /sys tree and add appropriate config files etc for a build. hopefully others will build on this so that we get 1/ these drivers improved and the shell scripts improved in how/where that hook the new code in. 2/ similar tools for providing skeletons for other modules (I'm tempted to do a VFS filesystem skeleton :) please take a look and fix anything that maybe should be added. they compile and link fine, but I think I wouldn't trust them, as faar as RUNNING yet :) (well they really wouldn't do very much being skeletons.. we need to add PCI and EISA skeletons as well followed by a SCSI driver skeleton.
322 lines
6.1 KiB
Bash
322 lines
6.1 KiB
Bash
#!/bin/sh
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# This writes a skeleton driver and puts it into the kernel tree for you
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#arg1 is lowercase "foo"
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#
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# Trust me, RUN THIS SCRIPT :)
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#
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#-------cut here------------------
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cd /sys/i386/conf
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if [ "${1}X" = "X" ]
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then
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echo "Hey , how about some help here.. give me a device name!"
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exit 1
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fi
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UPPER=`echo ${1} |tr "[:lower:]" "[:upper:]"`
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cat >files.${UPPER} <<DONE
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dev/${1}.c optional ${1} device-driver
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DONE
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cat >${UPPER} <<DONE
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# Configuration file for kernel type: ${UPPER}
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ident ${UPPER}
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# \$Id:\$"
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DONE
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grep -v GENERIC < GENERIC >>${UPPER}
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cat >>${UPPER} <<DONE
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# trust me, you'll need this
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options DDB
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pseudo-device ${1} 4 # might as well allow 4 of them
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DONE
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cat >../../dev/${1}.c <<DONE
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/*
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* Copyright ME
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*
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* ${1} driver
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* \$Id:\$
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*/
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#include "${1}.h" /* generated file.. defines N${UPPER} */
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h> /* SYSINIT stuff */
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#include <sys/conf.h> /* cdevsw stuff */
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#include <sys/malloc.h> /* malloc region definitions */
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#include <machine/clock.h> /* DELAY() */
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#include <sys/${1}io.h> /* ${1} IOCTL definitions */
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#ifdef DEVFS
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#include <sys/devfsext.h> /* DEVFS defintitions */
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#endif /* DEVFS */
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/* Function prototypes (these should all be static except for ${1}intr()) */
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static d_open_t ${1}open;
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static d_close_t ${1}close;
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static d_read_t ${1}read;
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static d_write_t ${1}write;
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static d_ioctl_t ${1}ioctl;
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static d_mmap_t ${1}mmap;
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static d_select_t ${1}select;
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#define CDEV_MAJOR 20
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static struct cdevsw ${1}_cdevsw = {
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${1}open,
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${1}close,
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${1}read,
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${1}write,
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${1}ioctl,
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nullstop,
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nullreset,
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nodevtotty,
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${1}select,
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${1}mmap,
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NULL,
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"${1}",
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NULL,
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-1 };
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/*
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* device specific Misc defines
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*/
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#define BUFFERSIZE 1024
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#define UNIT(dev) minor(dev) /* assume one minor number per unit */
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/*
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* One of these per allocated device
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*/
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struct ${1}_softc {
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struct isa_device *dev;
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char buffer[BUFFERSIZE];
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#ifdef DEVFS
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static void *devfs_token;
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#endif
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} ;
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typedef struct ${1}_softc *sc_p;
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static sc_p sca[N${UPPER}];
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/*
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* Macro to check that the unit number is valid
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* Often this isn't needed as once the open() is performed,
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* the unit number is pretty much safe.. The exception would be if we
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* implemented devices that could "go away". in which case all these routines
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* would be wise to check the number, DIAGNOSTIC or not.
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*/
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#define CHECKUNIT(RETVAL) \
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do { /* the do-while is a safe way to do this grouping */ \
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if (unit > N${UPPER}) { \
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printf(__FUNCTION__ ":bad unit $d\n", unit); \
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return (RETVAL); \
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} \
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if (scp == NULL) { \
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printf( __FUNCTION__ ": unit $d not attached\n", unit);\
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return (RETVAL); \
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} \
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} while (0)
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#ifdef DIAGNOSTIC
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#define CHECKUNIT_DIAG(RETVAL) CHECKUNIT(RETVAL)
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#else /* DIAGNOSTIC */
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#define CHECKUNIT_DIAG(RETVAL)
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#endif /* DIAGNOSTIC */
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int ${1}ioctl (dev_t dev, int cmd, caddr_t data, int flag, struct proc *p)
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{
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int unit = UNIT (dev);
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sc_p scp = sca[unit];
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CHECKUNIT_DIAG(ENXIO);
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switch (cmd) {
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case DHIOCRESET:
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/* whatever resets it */
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outb(scp->dev->id_iobase, 0xff);
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break;
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default:
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return ENXIO;
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}
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return (0);
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}
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/*
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* You also need read, write, open, close routines.
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* This should get you started
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*/
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static int
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${1}open(dev_t dev, int oflags, int devtype, struct proc *p)
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{
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int unit = UNIT (dev);
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sc_p scp = sca[unit];
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CHECKUNIT(ENXIO);
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/*
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* Do processing
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*/
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return (0);
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}
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static int
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${1}close(dev_t dev, int fflag, int devtype, struct proc *p)
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{
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int unit = UNIT (dev);
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sc_p scp = sca[unit];
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CHECKUNIT_DIAG(ENXIO);
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/*
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* Do processing
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*/
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return (0);
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}
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static int
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${1}read(dev_t dev, struct uio *uio, int ioflag)
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{
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int unit = UNIT (dev);
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sc_p scp = sca[unit];
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int toread;
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CHECKUNIT_DIAG(ENXIO);
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/*
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* Do processing
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* read from buffer
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*/
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toread = (min(uio->uio_resid, sizeof(scp->buffer)));
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return(uiomove(scp->buffer, toread, uio));
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}
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static int
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${1}write(dev_t dev, struct uio *uio, int ioflag)
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{
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int unit = UNIT (dev);
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sc_p scp = sca[unit];
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int towrite;
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CHECKUNIT_DIAG(ENXIO);
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/*
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* Do processing
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* write to buffer
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*/
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towrite = (min(uio->uio_resid, sizeof(scp->buffer)));
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return(uiomove(scp->buffer, towrite, uio));
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}
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static int
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${1}mmap(dev_t dev, int offset, int nprot)
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{
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int unit = UNIT (dev);
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sc_p scp = sca[unit];
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CHECKUNIT_DIAG(-1);
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/*
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* Do processing
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*/
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#if 0 /* if we had a frame buffer or whatever.. do this */
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if (offset > FRAMEBUFFERSIZE - PAGE_SIZE) {
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return (-1);
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}
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return i386_btop((FRAMEBASE + offset));
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#else
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return (-1);
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#endif
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}
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static int
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${1}select(dev_t dev, int which, struct proc *p)
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{
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int unit = UNIT (dev);
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sc_p scp = sca[unit];
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CHECKUNIT_DIAG(ENXIO);
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/*
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* Do processing
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*/
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return (0); /* this is the wrong value I'm sure */
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}
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/*
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* Now for some driver initialisation.
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* Occurs ONCE during boot (very early).
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*/
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static void
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${1}_drvinit(void *unused)
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{
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dev_t dev;
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int unit;
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sc_p scp = sca[unit];
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dev = makedev(CDEV_MAJOR, 0);
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cdevsw_add(&dev, &${1}_cdevsw, NULL);
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for (unit = 0; unit < N${UPPER}; unit++) {
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/*
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* Allocate storage for this instance .
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*/
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scp = malloc(sizeof(*scp), M_DEVBUF, M_NOWAIT);
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if( scp == NULL) {
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printf("${1}%d failed to allocate strorage\n", unit);
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return ;
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}
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bzero(scp, sizeof(*scp));
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sca[unit] = scp;
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#if DEVFS
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scp->devfs_token = devfs_add_devswf(&${1}_cdevsw, unit, DV_CHR,
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UID_ROOT, GID_KMEM, 0640, "${1}%d", unit);
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#endif
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}
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}
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SYSINIT(${1}dev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE+CDEV_MAJOR,
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${1}_drvinit, NULL)
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DONE
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cat >../../sys/${1}io.h <<DONE
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/*
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* Definitions needed to access the ${1} device (ioctls etc)
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* see mtio.h , ioctl.h as examples
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*/
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#ifndef SYS_DHIO_H
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#define SYS_DHIO_H
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#ifndef KERNEL
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#include <sys/types.h>
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#endif
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#include <sys/ioccom.h>
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/*
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* define an ioctl here
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*/
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#define DHIOCRESET _IO('D', 0) /* reset the ${1} device */
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#endif
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DONE
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config ${UPPER}
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cd ../../compile/${UPPER}
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make depend
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make ${1}.o
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make
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exit
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#--------------end of script---------------
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#
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#you also need to add an entry into the cdevsw[]
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#array in conf.c, but it's too hard to do in a script..
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#
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#edit to your taste..
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#
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#
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