summaryrefslogtreecommitdiffstats
path: root/drivers/char/drm/drm_sysfs.c
blob: 68e43ddc16aea44fd927cbc9ae6eb532f7d7eb2a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
/*
 * 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 "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 {
	dev_t dev;
	struct class_device class_dev;
};
#define to_simple_dev(d) container_of(d, struct simple_dev, class_dev)

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);
}

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 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,
					  drm_head_t *head)
{
	struct simple_dev *s_dev = NULL;
	int i, 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 = MKDEV(DRM_MAJOR, head->minor);
	s_dev->class_dev.dev = &(head->dev->pdev)->dev;
	s_dev->class_dev.class = &cs->class;

	snprintf(s_dev->class_dev.class_id, BUS_ID_SIZE, "card%d", head->minor);
	retval = class_device_register(&s_dev->class_dev);
	if (retval)
		goto error;

	class_device_create_file(&s_dev->class_dev, &cs->attr);
	class_set_devdata(&s_dev->class_dev, head);

	for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
		class_device_create_file(&s_dev->class_dev, &class_device_attrs[i]);
	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(struct class_device *class_dev)
{
	struct simple_dev *s_dev = to_simple_dev(class_dev);
	int i;

	for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
		class_device_remove_file(&s_dev->class_dev, &class_device_attrs[i]);
	class_device_unregister(&s_dev->class_dev);
}