/* * 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 * * Fixed a failing symbol register to free the device registration * Alan Cox 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 , * adapted by Bjorn Ekwall * corrected by Alan Cox */ #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_APM #include #endif #include #include #ifdef CONFIG_KERNELD #include #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 acq_init(void); extern void pcwatchdog_init(void); extern int rtc_init(void); extern int dsp56k_init(void); extern int nvram_init(void); extern int radio_init(void); extern void hfmodem_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) && file->f_op->open) 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_ACQUIRE_WDT acq_init(); #endif #ifdef CONFIG_SOFT_WATCHDOG watchdog_init(); #endif #ifdef CONFIG_APM apm_bios_init(); #endif #ifdef CONFIG_H8 h8_init(); #endif #ifdef CONFIG_RTC rtc_init(); #endif #ifdef CONFIG_ATARI_DSP56K dsp56k_init(); #endif #ifdef CONFIG_HFMODEM hfmodem_init(); #endif #ifdef CONFIG_NVRAM nvram_init(); #endif #ifdef CONFIG_MISC_RADIO radio_init(); #endif #ifdef CONFIG_HFMODEM hfmodem_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; }