David Reid
fb8aa06112
Add ibuild rules for Marcus's AC97 driver to the openbeos build, ithat will allow it to be built for OpenBeOS. At present they don't work due to missing headers, but aftre a succesful build this can be uncommented and it will build and OpenBeOS will try to laod it. This will provide a nice test case as Marcus has provided the source! Thanks. Added the null, zero & digit drivers here and they will be removed from kernel/drivers NB this has shown that drivers are not being handled correctly by devfs. I would have tried to look at it but as it falls under the remit of vfs I won't touch it. git-svn-id: file:///srv/svn/repos/haiku/trunk/current@147 a95241bf-73f2-0310-859d-f6bbb57e9c96
173 lines
2.9 KiB
C
173 lines
2.9 KiB
C
/*******************************************************************************
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/
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/ File: driver.c
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/
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/ Description: The digit driver allows a client to read 16 bytes of data.
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/ Each byte has the same value (by default 0); the client
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/ can change this value with write or ioctl commands.
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/
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/ Copyright 1999, Be Incorporated. All Rights Reserved.
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/ This file may be used under the terms of the Be Sample Code License.
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/
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*******************************************************************************/
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#include <ktypes.h>
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#include <drivers.h>
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#include <debug.h>
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#include <memheap.h>
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#include <string.h>
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#include <errno.h>
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#define DPRINTF(a) dprintf("digit: "); dprintf a
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#define MAX_SIZE 16
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#define DEVICE_NAME "misc/digit"
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#define TOUCH(x) ((void)x)
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/*********************************/
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struct digit_state {
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uchar value;
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};
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static status_t
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digit_open(const char *name, uint32 mode, void **cookie)
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{
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struct digit_state *s;
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TOUCH(name); TOUCH(mode);
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DPRINTF(("open\n"));
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s = (struct digit_state*) kmalloc(sizeof(*s));
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if (!s)
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return ENOMEM;
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s->value = 0;
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*cookie = s;
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return 0;
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}
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static status_t
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digit_close(void *cookie)
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{
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DPRINTF(("close\n"));
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TOUCH(cookie);
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return 0;
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}
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static status_t
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digit_free(void *cookie)
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{
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DPRINTF(("free\n"));
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kfree(cookie);
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return 0;
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}
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static status_t
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digit_ioctl(void *cookie, uint32 op, void *data, size_t len)
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{
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TOUCH(len);
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DPRINTF(("ioctl\n"));
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if (op == 'set ') {
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struct digit_state *s = (struct digit_state *)cookie;
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s->value = *(uchar *)data;
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DPRINTF(("Set digit to %2.2x\n", s->value));
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return 0;
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}
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return ENOSYS;
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}
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static ssize_t
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digit_read(void *cookie, off_t pos, void *buffer, size_t *len)
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{
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struct digit_state *s = (struct digit_state *)cookie;
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DPRINTF(("read\n"));
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if (pos >= MAX_SIZE) {
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*len = 0;
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return ESPIPE;
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} else if (pos + *len > MAX_SIZE)
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*len = (size_t)(MAX_SIZE - pos);
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if (*len)
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memset(buffer, s->value, *len);
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return 0;
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}
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static ssize_t
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digit_write(void *cookie, off_t pos, const void *buffer, size_t *len)
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{
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struct digit_state *s = (struct digit_state *)cookie;
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TOUCH(pos);
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s->value = ((uchar *)buffer)[*len - 1];
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DPRINTF(("write: set digit to %2.2x\n", s->value));
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return 0;
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}
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/***************************/
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status_t init_hardware()
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{
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DPRINTF(("Do you digit?\n"));
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return 0;
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}
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const char **publish_devices(void)
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{
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static const char *devices[] = {
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DEVICE_NAME, NULL
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};
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return devices;
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}
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device_hooks *find_device(const char *name)
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{
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static device_hooks hooks = {
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&digit_open,
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&digit_close,
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&digit_free,
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&digit_ioctl,
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&digit_read,
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&digit_write,
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/* Leave select/deselect/readv/writev undefined. The kernel will
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* use its own default implementation. The basic hooks above this
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* line MUST be defined, however. */
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NULL,
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NULL,
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// NULL,
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// NULL
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};
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if (!strcmp(name, DEVICE_NAME))
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return &hooks;
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return NULL;
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}
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status_t init_driver()
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{
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return 0;
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}
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void uninit_driver()
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{
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}
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