drm: simplify sysfs code for drm

This simplifies the sysfs code for the drm and add a dri_library_name
attribute which can be used by a userspace app to figure out which
library to load.

From: Jon Smirl <jonsmirl@gmail.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 29 insertions, 39 deletions

diff --git a/drivers/char/drm/drm_sysfs.c b/drivers/char/drm/drm_sysfs.c
index 6d3449761914..68e43ddc16ae 100644
--- a/drivers/char/drm/drm_sysfs.c
+++ b/drivers/char/drm/drm_sysfs.c
@@ -15,8 +15,6 @@
 #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"
@@ -28,15 +26,11 @@ struct drm_sysfs_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);
@@ -124,6 +118,18 @@ void drm_sysfs_destroy(struct drm_sysfs_class *cs)
         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.
@@ -138,13 +144,11 @@ void drm_sysfs_destroy(struct drm_sysfs_class *cs)
  * 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, ...)
+struct class_device *drm_sysfs_device_add(struct drm_sysfs_class *cs,
+                                          drm_head_t *head)
 {
-        va_list args;
         struct simple_dev *s_dev = NULL;
-        int retval;
+        int i, retval;
 
         if ((cs == NULL) || (IS_ERR(cs))) {
                 retval = -ENODEV;
@@ -158,26 +162,23 @@ struct class_device *drm_sysfs_device_add(struct drm_sysfs_class *cs, dev_t dev,
         }
         memset(s_dev, 0x00, sizeof(*s_dev));
 
-        s_dev->dev = dev;
-        s_dev->class_dev.dev = device;
+        s_dev->dev = MKDEV(DRM_MAJOR, head->minor);
+        s_dev->class_dev.dev = &(head->dev->pdev)->dev;
         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);
+        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);
 
-        spin_lock(&simple_dev_list_lock);
-        list_add(&s_dev->node, &simple_dev_list);
-        spin_unlock(&simple_dev_list_lock);
-
+        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:
+error:
         kfree(s_dev);
         return ERR_PTR(retval);
 }
@@ -189,23 +190,12 @@ struct class_device *drm_sysfs_device_add(struct drm_sysfs_class *cs, dev_t dev,
  * 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)
+void drm_sysfs_device_remove(struct class_device *class_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);
-        }
+        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);
 }