![Akinobu Mita](/assets/img/avatar_default.png)
class_create() and class_device_create() return error code as a pointer on failure. These return values need to be checked by IS_ERR(). Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Dave Airlie <airlied@linux.ie>
157 lines
4.5 KiB
C
157 lines
4.5 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/device.h>
|
|
#include <linux/kdev_t.h>
|
|
#include <linux/err.h>
|
|
|
|
#include "drm_core.h"
|
|
#include "drmP.h"
|
|
|
|
/* 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 class *drm_sysfs_create(struct module *owner, char *name)
|
|
{
|
|
struct class *class;
|
|
int err;
|
|
|
|
class = class_create(owner, name);
|
|
if (IS_ERR(class)) {
|
|
err = PTR_ERR(class);
|
|
goto err_out;
|
|
}
|
|
|
|
err = class_create_file(class, &class_attr_version);
|
|
if (err)
|
|
goto err_out_class;
|
|
|
|
return class;
|
|
|
|
err_out_class:
|
|
class_destroy(class);
|
|
err_out:
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
/**
|
|
* 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 class *class)
|
|
{
|
|
if ((class == NULL) || (IS_ERR(class)))
|
|
return;
|
|
|
|
class_remove_file(class, &class_attr_version);
|
|
class_destroy(class);
|
|
}
|
|
|
|
static ssize_t show_dri(struct class_device *class_device, char *buf)
|
|
{
|
|
drm_device_t * dev = ((drm_head_t *)class_get_devdata(class_device))->dev;
|
|
if (dev->driver->dri_library_name)
|
|
return dev->driver->dri_library_name(dev, buf);
|
|
return snprintf(buf, PAGE_SIZE, "%s\n", dev->driver->pci_driver.name);
|
|
}
|
|
|
|
static struct class_device_attribute class_device_attrs[] = {
|
|
__ATTR(dri_library_name, S_IRUGO, show_dri, NULL),
|
|
};
|
|
|
|
/**
|
|
* drm_sysfs_device_add - adds a class device to sysfs for a character driver
|
|
* @cs: pointer to the struct 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 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 class *cs, drm_head_t *head)
|
|
{
|
|
struct class_device *class_dev;
|
|
int i, j, err;
|
|
|
|
class_dev = class_device_create(cs, NULL,
|
|
MKDEV(DRM_MAJOR, head->minor),
|
|
&(head->dev->pdev)->dev,
|
|
"card%d", head->minor);
|
|
if (IS_ERR(class_dev)) {
|
|
err = PTR_ERR(class_dev);
|
|
goto err_out;
|
|
}
|
|
|
|
class_set_devdata(class_dev, head);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++) {
|
|
err = class_device_create_file(class_dev,
|
|
&class_device_attrs[i]);
|
|
if (err)
|
|
goto err_out_files;
|
|
}
|
|
|
|
return class_dev;
|
|
|
|
err_out_files:
|
|
if (i > 0)
|
|
for (j = 0; j < i; j++)
|
|
class_device_remove_file(class_dev,
|
|
&class_device_attrs[i]);
|
|
class_device_unregister(class_dev);
|
|
err_out:
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
/**
|
|
* 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(struct class_device *class_dev)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
|
|
class_device_remove_file(class_dev, &class_device_attrs[i]);
|
|
class_device_unregister(class_dev);
|
|
}
|