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/*
* linux/drivers/char/misc.c
*
* Generic misc open routine by Johan Myreen
*
* Based on code from Linus
*
* Teemu Rantanen's Microsoft Busmouse support and Derrick Cole's
* changes incorporated into 0.97pl4
* by Peter Cervasio (pete%q106fm.uucp@wupost.wustl.edu) (08SEP92)
* See busmouse.c for particulars.
*
* Made things a lot mode modular - easy to compile in just one or two
* of the misc drivers, as they are now completely independent. Linus.
*
* Support for loadable modules. 8-Sep-95 Philip Blundell <pjb27@cam.ac.uk>
*
* Fixed a failing symbol register to free the device registration
* Alan Cox <alan@lxorguk.ukuu.org.uk> 21-Jan-96
*
* Dynamic minors and /proc/mice by Alessandro Rubini. 26-Mar-96
*
* Renamed to misc and miscdevice to be more accurate. Alan Cox 26-Mar-96
*
* Handling of mouse minor numbers for kerneld:
* Idea by Jacques Gelinas <jack@solucorp.qc.ca>,
* adapted by Bjorn Ekwall <bj0rn@blox.se>
* corrected by Alan Cox <alan@lxorguk.ukuu.org.uk>
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/miscdevice.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/malloc.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/init.h>
#ifdef CONFIG_APM
#include <linux/apm_bios.h>
#endif
#include <linux/tty.h>
#include <linux/selection.h>
#ifdef CONFIG_KERNELD
#include <linux/kerneld.h>
#endif
/*
* Head entry for the doubly linked miscdevice list
*/
static struct miscdevice misc_list = { 0, "head", NULL, &misc_list, &misc_list };
/*
* Assigned numbers, used for dynamic minors
*/
#define DYNAMIC_MINORS 64 /* like dynamic majors */
static unsigned char misc_minors[DYNAMIC_MINORS / 8];
#ifndef MODULE
extern int bus_mouse_init(void);
extern int psaux_init(void);
extern int ms_bus_mouse_init(void);
extern int atixl_busmouse_init(void);
extern int amiga_mouse_init(void);
extern int atari_mouse_init(void);
extern int sun_mouse_init(void);
extern void gfx_register(void);
extern void streamable_init(void);
extern void watchdog_init(void);
extern void wdt_init(void);
extern void pcwatchdog_init(void);
extern int rtc_init(void);
extern int dsp56k_init(void);
#ifdef CONFIG_PROC_FS
static int misc_read_proc(char *buf, char **start, off_t offset,
int len, int *eof, void *private)
{
struct miscdevice *p;
len=0;
for (p = misc_list.next; p != &misc_list && len < 4000; p = p->next)
len += sprintf(buf+len, "%3i %s\n",p->minor, p->name ?: "");
*start = buf + offset;
return len > offset ? len - offset : 0;
}
#endif /* PROC_FS */
#endif /* !MODULE */
static int misc_open(struct inode * inode, struct file * file)
{
int minor = MINOR(inode->i_rdev);
struct miscdevice *c = misc_list.next;
file->f_op = NULL;
while ((c != &misc_list) && (c->minor != minor))
c = c->next;
if (c == &misc_list) {
#ifdef CONFIG_KERNELD
char modname[20];
sprintf(modname, "char-major-%d-%d", MISC_MAJOR, minor);
request_module(modname);
c = misc_list.next;
while ((c != &misc_list) && (c->minor != minor))
c = c->next;
if (c == &misc_list)
#endif
return -ENODEV;
}
if ((file->f_op = c->fops))
return file->f_op->open(inode,file);
else
return -ENODEV;
}
static struct file_operations misc_fops = {
NULL, /* seek */
NULL, /* read */
NULL, /* write */
NULL, /* readdir */
NULL, /* poll */
NULL, /* ioctl */
NULL, /* mmap */
misc_open,
NULL /* release */
};
int misc_register(struct miscdevice * misc)
{
if (misc->next || misc->prev)
return -EBUSY;
if (misc->minor == MISC_DYNAMIC_MINOR) {
int i = DYNAMIC_MINORS;
while (--i >= 0)
if ( (misc_minors[i>>3] & (1 << (i&7))) == 0)
break;
if (i<0) return -EBUSY;
misc->minor = i;
}
if (misc->minor < DYNAMIC_MINORS)
misc_minors[misc->minor >> 3] |= 1 << (misc->minor & 7);
MOD_INC_USE_COUNT;
misc->next = &misc_list;
misc->prev = misc_list.prev;
misc->prev->next = misc;
misc->next->prev = misc;
return 0;
}
int misc_deregister(struct miscdevice * misc)
{
int i = misc->minor;
if (!misc->next || !misc->prev)
return -EINVAL;
MOD_DEC_USE_COUNT;
misc->prev->next = misc->next;
misc->next->prev = misc->prev;
misc->next = NULL;
misc->prev = NULL;
if (i < DYNAMIC_MINORS && i>0) {
misc_minors[i>>3] &= ~(1 << (misc->minor & 7));
}
return 0;
}
#ifdef MODULE
#define misc_init init_module
void cleanup_module(void)
{
unregister_chrdev(MISC_MAJOR, "misc");
}
#endif
EXPORT_SYMBOL(misc_register);
EXPORT_SYMBOL(misc_deregister);
#if defined(CONFIG_PROC_FS) && !defined(MODULE)
static struct proc_dir_entry *proc_misc;
#endif
__initfunc(int misc_init(void))
{
#ifndef MODULE
#ifdef CONFIG_PROC_FS
proc_misc = create_proc_entry("misc", 0, 0);
if (proc_misc)
proc_misc->read_proc = misc_read_proc;
#endif /* PROC_FS */
#ifdef CONFIG_BUSMOUSE
bus_mouse_init();
#endif
#if defined CONFIG_PSMOUSE
psaux_init();
#endif
#ifdef CONFIG_MS_BUSMOUSE
ms_bus_mouse_init();
#endif
#ifdef CONFIG_ATIXL_BUSMOUSE
atixl_busmouse_init();
#endif
#ifdef CONFIG_AMIGAMOUSE
amiga_mouse_init();
#endif
#ifdef CONFIG_ATARIMOUSE
atari_mouse_init();
#endif
#ifdef CONFIG_SUN_MOUSE
sun_mouse_init();
#endif
#ifdef CONFIG_PC110_PAD
pc110pad_init();
#endif
/*
* Only one watchdog can succeed. We probe the pcwatchdog first,
* then the wdt cards and finally the software watchdog which always
* works. This means if your hardware watchdog dies or is 'borrowed'
* for some reason the software watchdog still gives you some cover.
*/
#ifdef CONFIG_PCWATCHDOG
pcwatchdog_init();
#endif
#ifdef CONFIG_WDT
wdt_init();
#endif
#ifdef CONFIG_SOFT_WATCHDOG
watchdog_init();
#endif
#ifdef CONFIG_APM
apm_bios_init();
#endif
#ifdef CONFIG_RTC
rtc_init();
#endif
#ifdef CONFIG_ATARI_DSP56K
dsp56k_init();
#endif
#ifdef CONFIG_SGI_GRAPHICS
gfx_register ();
streamable_init ();
#endif
#endif /* !MODULE */
if (register_chrdev(MISC_MAJOR,"misc",&misc_fops)) {
printk("unable to get major %d for misc devices\n",
MISC_MAJOR);
return -EIO;
}
return 0;
}
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