linux/drivers/char/drm/drm_sysfs.c
Tim Schmielau 4e57b68178 [PATCH] fix missing includes
I recently picked up my older work to remove unnecessary #includes of
sched.h, starting from a patch by Dave Jones to not include sched.h
from module.h. This reduces the number of indirect includes of sched.h
by ~300. Another ~400 pointless direct includes can be removed after
this disentangling (patch to follow later).
However, quite a few indirect includes need to be fixed up for this.

In order to feed the patches through -mm with as little disturbance as
possible, I've split out the fixes I accumulated up to now (complete for
i386 and x86_64, more archs to follow later) and post them before the real
patch.  This way this large part of the patch is kept simple with only
adding #includes, and all hunks are independent of each other.  So if any
hunk rejects or gets in the way of other patches, just drop it.  My scripts
will pick it up again in the next round.

Signed-off-by: Tim Schmielau <tim@physik3.uni-rostock.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30 17:37:32 -08:00

211 lines
5.6 KiB
C

/*
* drm_sysfs.c - Modifications to drm_sysfs_class.c to support
* extra sysfs attribute from DRM. Normal drm_sysfs_class
* does not allow adding attributes.
*
* Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
* Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (c) 2003-2004 IBM Corp.
*
* This file is released under the GPLv2
*
*/
#include <linux/config.h>
#include <linux/device.h>
#include <linux/kdev_t.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/string.h>
#include "drm_core.h"
#include "drmP.h"
struct drm_sysfs_class {
struct class_device_attribute attr;
struct class class;
};
#define to_drm_sysfs_class(d) container_of(d, struct drm_sysfs_class, class)
struct simple_dev {
struct list_head node;
dev_t dev;
struct class_device class_dev;
};
#define to_simple_dev(d) container_of(d, struct simple_dev, class_dev)
static LIST_HEAD(simple_dev_list);
static DEFINE_SPINLOCK(simple_dev_list_lock);
static void release_simple_dev(struct class_device *class_dev)
{
struct simple_dev *s_dev = to_simple_dev(class_dev);
kfree(s_dev);
}
static ssize_t show_dev(struct class_device *class_dev, char *buf)
{
struct simple_dev *s_dev = to_simple_dev(class_dev);
return print_dev_t(buf, s_dev->dev);
}
static void drm_sysfs_class_release(struct class *class)
{
struct drm_sysfs_class *cs = to_drm_sysfs_class(class);
kfree(cs);
}
/* Display the version of drm_core. This doesn't work right in current design */
static ssize_t version_show(struct class *dev, char *buf)
{
return sprintf(buf, "%s %d.%d.%d %s\n", CORE_NAME, CORE_MAJOR,
CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
}
static CLASS_ATTR(version, S_IRUGO, version_show, NULL);
/**
* drm_sysfs_create - create a struct drm_sysfs_class structure
* @owner: pointer to the module that is to "own" this struct drm_sysfs_class
* @name: pointer to a string for the name of this class.
*
* This is used to create a struct drm_sysfs_class pointer that can then be used
* in calls to drm_sysfs_device_add().
*
* Note, the pointer created here is to be destroyed when finished by making a
* call to drm_sysfs_destroy().
*/
struct drm_sysfs_class *drm_sysfs_create(struct module *owner, char *name)
{
struct drm_sysfs_class *cs;
int retval;
cs = kmalloc(sizeof(*cs), GFP_KERNEL);
if (!cs) {
retval = -ENOMEM;
goto error;
}
memset(cs, 0x00, sizeof(*cs));
cs->class.name = name;
cs->class.class_release = drm_sysfs_class_release;
cs->class.release = release_simple_dev;
cs->attr.attr.name = "dev";
cs->attr.attr.mode = S_IRUGO;
cs->attr.attr.owner = owner;
cs->attr.show = show_dev;
cs->attr.store = NULL;
retval = class_register(&cs->class);
if (retval)
goto error;
class_create_file(&cs->class, &class_attr_version);
return cs;
error:
kfree(cs);
return ERR_PTR(retval);
}
/**
* drm_sysfs_destroy - destroys a struct drm_sysfs_class structure
* @cs: pointer to the struct drm_sysfs_class that is to be destroyed
*
* Note, the pointer to be destroyed must have been created with a call to
* drm_sysfs_create().
*/
void drm_sysfs_destroy(struct drm_sysfs_class *cs)
{
if ((cs == NULL) || (IS_ERR(cs)))
return;
class_unregister(&cs->class);
}
/**
* drm_sysfs_device_add - adds a class device to sysfs for a character driver
* @cs: pointer to the struct drm_sysfs_class that this device should be registered to.
* @dev: the dev_t for the device to be added.
* @device: a pointer to a struct device that is assiociated with this class device.
* @fmt: string for the class device's name
*
* A struct class_device will be created in sysfs, registered to the specified
* class. A "dev" file will be created, showing the dev_t for the device. The
* pointer to the struct class_device will be returned from the call. Any further
* sysfs files that might be required can be created using this pointer.
* Note: the struct drm_sysfs_class passed to this function must have previously been
* created with a call to drm_sysfs_create().
*/
struct class_device *drm_sysfs_device_add(struct drm_sysfs_class *cs, dev_t dev,
struct device *device,
const char *fmt, ...)
{
va_list args;
struct simple_dev *s_dev = NULL;
int retval;
if ((cs == NULL) || (IS_ERR(cs))) {
retval = -ENODEV;
goto error;
}
s_dev = kmalloc(sizeof(*s_dev), GFP_KERNEL);
if (!s_dev) {
retval = -ENOMEM;
goto error;
}
memset(s_dev, 0x00, sizeof(*s_dev));
s_dev->dev = dev;
s_dev->class_dev.dev = device;
s_dev->class_dev.class = &cs->class;
va_start(args, fmt);
vsnprintf(s_dev->class_dev.class_id, BUS_ID_SIZE, fmt, args);
va_end(args);
retval = class_device_register(&s_dev->class_dev);
if (retval)
goto error;
class_device_create_file(&s_dev->class_dev, &cs->attr);
spin_lock(&simple_dev_list_lock);
list_add(&s_dev->node, &simple_dev_list);
spin_unlock(&simple_dev_list_lock);
return &s_dev->class_dev;
error:
kfree(s_dev);
return ERR_PTR(retval);
}
/**
* drm_sysfs_device_remove - removes a class device that was created with drm_sysfs_device_add()
* @dev: the dev_t of the device that was previously registered.
*
* This call unregisters and cleans up a class device that was created with a
* call to drm_sysfs_device_add()
*/
void drm_sysfs_device_remove(dev_t dev)
{
struct simple_dev *s_dev = NULL;
int found = 0;
spin_lock(&simple_dev_list_lock);
list_for_each_entry(s_dev, &simple_dev_list, node) {
if (s_dev->dev == dev) {
found = 1;
break;
}
}
if (found) {
list_del(&s_dev->node);
spin_unlock(&simple_dev_list_lock);
class_device_unregister(&s_dev->class_dev);
} else {
spin_unlock(&simple_dev_list_lock);
}
}