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nubus: Rework /proc/bus/nubus/s/ implementation

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The /proc/bus/nubus/s/ directory tree for any slot s is missing a lot
of information. The struct file_operations methods have long been left
unimplemented (hence the familiar compile-time warning, "Need to set
some I/O handlers here").

Slot resources have a complex structure which varies depending on board
function. The logic for interpreting these ROM data structures is found
in nubus.c. Let's not duplicate that logic in proc.c.

Create the /proc/bus/nubus/s/ inodes while scanning slot s. During
descent through slot resource subdirectories, call the new
nubus_proc_add_foo() functions to create the procfs inodes.

Also add a new function, nubus_seq_write_rsrc_mem(), to write the
contents of a particular slot resource to a given seq_file. This is
used by the procfs file_operations methods, to finally give userspace
access to slot ROM information, such as the available video modes.

Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Finn Thain 2018-01-13 17:37:13 -05:00 • committed by Geert Uytterhoeven
parent 883b8cb31a
commit 2f7dd07eca
3 changed files with 258 additions and 119 deletions
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37
include/linux/nubus.h
View file

@ -13,11 +13,15 @@
#include <asm/nubus.h>
#include <uapi/linux/nubus.h>
struct proc_dir_entry;
struct seq_file;
struct nubus_dir {
unsigned char *base;
unsigned char *ptr;
int done;
int mask;
struct proc_dir_entry *procdir;
};
struct nubus_dirent {
@ -84,12 +88,33 @@ extern struct nubus_board *nubus_boards;
/* Generic NuBus interface functions, modelled after the PCI interface */
#ifdef CONFIG_PROC_FS
extern void nubus_proc_init(void);
void nubus_proc_init(void);
struct proc_dir_entry *nubus_proc_add_board(struct nubus_board *board);
struct proc_dir_entry *nubus_proc_add_rsrc_dir(struct proc_dir_entry *procdir,
const struct nubus_dirent *ent,
struct nubus_board *board);
void nubus_proc_add_rsrc_mem(struct proc_dir_entry *procdir,
const struct nubus_dirent *ent,
unsigned int size);
void nubus_proc_add_rsrc(struct proc_dir_entry *procdir,
const struct nubus_dirent *ent);
#else
static inline void nubus_proc_init(void) {}
static inline
struct proc_dir_entry *nubus_proc_add_board(struct nubus_board *board)
{ return NULL; }
static inline
struct proc_dir_entry *nubus_proc_add_rsrc_dir(struct proc_dir_entry *procdir,
const struct nubus_dirent *ent,
struct nubus_board *board)
{ return NULL; }
static inline void nubus_proc_add_rsrc_mem(struct proc_dir_entry *procdir,
const struct nubus_dirent *ent,
unsigned int size) {}
static inline void nubus_proc_add_rsrc(struct proc_dir_entry *procdir,
const struct nubus_dirent *ent) {}
#endif
int nubus_proc_attach_device(struct nubus_dev *dev);
/* If we need more precision we can add some more of these */
struct nubus_dev *nubus_find_type(unsigned short category,
unsigned short type,
@ -125,8 +150,12 @@ int nubus_get_subdir(const struct nubus_dirent *ent,
struct nubus_dir *dir);
void nubus_get_rsrc_mem(void *dest, const struct nubus_dirent *dirent,
unsigned int len);
void nubus_get_rsrc_str(char *dest, const struct nubus_dirent *dirent,
unsigned int maxlen);
unsigned int nubus_get_rsrc_str(char *dest, const struct nubus_dirent *dirent,
unsigned int len);
void nubus_seq_write_rsrc_mem(struct seq_file *m,
const struct nubus_dirent *dirent,
unsigned int len);
unsigned char *nubus_dirptr(const struct nubus_dirent *nd);
/* Returns a pointer to the "standard" slot space. */
static inline void *nubus_slot_addr(int slot)