drivers/char/drm/drm_sysfs.c

   1
   2 /*
   3  * drm_sysfs.c - Modifications to drm_sysfs_class.c to support
   4  *               extra sysfs attribute from DRM. Normal drm_sysfs_class
   5  *               does not allow adding attributes.
   6  *
   7  * Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
   8  * Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
   9  * Copyright (c) 2003-2004 IBM Corp.
  10  *
  11  * This file is released under the GPLv2
  12  *
  13  */
  14
  15 #include <linux/device.h>
  16 #include <linux/kdev_t.h>
  17 #include <linux/err.h>
  18
  19 #include "drm_core.h"
  20 #include "drmP.h"
  21
  22 #define to_drm_device(d) container_of(d, struct drm_device, dev)
  23
  24 /**
  25  * drm_sysfs_suspend - DRM class suspend hook
  26  * @dev: Linux device to suspend
  27  * @state: power state to enter
  28  *
  29  * Just figures out what the actual struct drm_device associated with
  30  * @dev is and calls its suspend hook, if present.
  31  */
  32 static int drm_sysfs_suspend(struct device *dev, pm_message_t state)
  33 {
  34         struct drm_device *drm_dev = to_drm_device(dev);
  35
  36         printk(KERN_ERR "%s\n", __FUNCTION__);
  37
  38         if (drm_dev->driver->suspend)
  39 <<<<<<< HEAD:drivers/char/drm/drm_sysfs.c
  40                 return drm_dev->driver->suspend(drm_dev);
  41 =======
  42                 return drm_dev->driver->suspend(drm_dev, state);
  43 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/char/drm/drm_sysfs.c
  44
  45         return 0;
  46 }
  47
  48 /**
  49  * drm_sysfs_resume - DRM class resume hook
  50  * @dev: Linux device to resume
  51  *
  52  * Just figures out what the actual struct drm_device associated with
  53  * @dev is and calls its resume hook, if present.
  54  */
  55 static int drm_sysfs_resume(struct device *dev)
  56 {
  57         struct drm_device *drm_dev = to_drm_device(dev);
  58
  59         if (drm_dev->driver->resume)
  60                 return drm_dev->driver->resume(drm_dev);
  61
  62         return 0;
  63 }
  64
  65 /* Display the version of drm_core. This doesn't work right in current design */
  66 static ssize_t version_show(struct class *dev, char *buf)
  67 {
  68         return sprintf(buf, "%s %d.%d.%d %s\n", CORE_NAME, CORE_MAJOR,
  69                        CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
  70 }
  71
  72 static CLASS_ATTR(version, S_IRUGO, version_show, NULL);
  73
  74 /**
  75  * drm_sysfs_create - create a struct drm_sysfs_class structure
  76  * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
  77  * @name: pointer to a string for the name of this class.
  78  *
  79  * This is used to create DRM class pointer that can then be used
  80  * in calls to drm_sysfs_device_add().
  81  *
  82  * Note, the pointer created here is to be destroyed when finished by making a
  83  * call to drm_sysfs_destroy().
  84  */
  85 struct class *drm_sysfs_create(struct module *owner, char *name)
  86 {
  87         struct class *class;
  88         int err;
  89
  90         class = class_create(owner, name);
  91         if (IS_ERR(class)) {
  92                 err = PTR_ERR(class);
  93                 goto err_out;
  94         }
  95
  96         class->suspend = drm_sysfs_suspend;
  97         class->resume = drm_sysfs_resume;
  98
  99         err = class_create_file(class, &class_attr_version);
 100         if (err)
 101                 goto err_out_class;
 102
 103         return class;
 104
 105 err_out_class:
 106         class_destroy(class);
 107 err_out:
 108         return ERR_PTR(err);
 109 }
 110
 111 /**
 112  * drm_sysfs_destroy - destroys DRM class
 113  *
 114  * Destroy the DRM device class.
 115  */
 116 void drm_sysfs_destroy(void)
 117 {
 118         if ((drm_class == NULL) || (IS_ERR(drm_class)))
 119                 return;
 120         class_remove_file(drm_class, &class_attr_version);
 121         class_destroy(drm_class);
 122 }
 123
 124 static ssize_t show_dri(struct device *device, struct device_attribute *attr,
 125                         char *buf)
 126 {
 127         struct drm_device *dev = to_drm_device(device);
 128         if (dev->driver->dri_library_name)
 129                 return dev->driver->dri_library_name(dev, buf);
 130         return snprintf(buf, PAGE_SIZE, "%s\n", dev->driver->pci_driver.name);
 131 }
 132
 133 static struct device_attribute device_attrs[] = {
 134         __ATTR(dri_library_name, S_IRUGO, show_dri, NULL),
 135 };
 136
 137 /**
 138  * drm_sysfs_device_release - do nothing
 139  * @dev: Linux device
 140  *
 141  * Normally, this would free the DRM device associated with @dev, along
 142  * with cleaning up any other stuff.  But we do that in the DRM core, so
 143  * this function can just return and hope that the core does its job.
 144  */
 145 static void drm_sysfs_device_release(struct device *dev)
 146 {
 147         return;
 148 }
 149
 150 /**
 151  * drm_sysfs_device_add - adds a class device to sysfs for a character driver
 152  * @dev: DRM device to be added
 153  * @head: DRM head in question
 154  *
 155  * Add a DRM device to the DRM's device model class.  We use @dev's PCI device
 156  * as the parent for the Linux device, and make sure it has a file containing
 157  * the driver we're using (for userspace compatibility).
 158  */
 159 int drm_sysfs_device_add(struct drm_device *dev, struct drm_head *head)
 160 {
 161         int err;
 162         int i, j;
 163
 164         dev->dev.parent = &dev->pdev->dev;
 165         dev->dev.class = drm_class;
 166         dev->dev.release = drm_sysfs_device_release;
 167         dev->dev.devt = head->device;
 168         snprintf(dev->dev.bus_id, BUS_ID_SIZE, "card%d", head->minor);
 169
 170         err = device_register(&dev->dev);
 171         if (err) {
 172                 DRM_ERROR("device add failed: %d\n", err);
 173                 goto err_out;
 174         }
 175
 176         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
 177                 err = device_create_file(&dev->dev, &device_attrs[i]);
 178                 if (err)
 179                         goto err_out_files;
 180         }
 181
 182         return 0;
 183
 184 err_out_files:
 185         if (i > 0)
 186                 for (j = 0; j < i; j++)
 187                         device_remove_file(&dev->dev, &device_attrs[i]);
 188         device_unregister(&dev->dev);
 189 err_out:
 190
 191         return err;
 192 }
 193
 194 /**
 195  * drm_sysfs_device_remove - remove DRM device
 196  * @dev: DRM device to remove
 197  *
 198  * This call unregisters and cleans up a class device that was created with a
 199  * call to drm_sysfs_device_add()
 200  */
 201 void drm_sysfs_device_remove(struct drm_device *dev)
 202 {
 203         int i;
 204
 205         for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
 206                 device_remove_file(&dev->dev, &device_attrs[i]);
 207         device_unregister(&dev->dev);
 208 }