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>

6 files changed, 52 insertions, 52 deletions

diff --git a/drivers/char/drm/drmP.h b/drivers/char/drm/drmP.h
index 7fe516160b6..e9ede8d69e2 100644
--- a/drivers/char/drm/drmP.h
+++ b/drivers/char/drm/drmP.h
@@ -547,6 +547,7 @@ struct drm_driver {
         void (*kernel_context_switch_unlock) (struct drm_device * dev,
                                               drm_lock_t * lock);
         int (*vblank_wait) (struct drm_device * dev, unsigned int *sequence);
+        int (*dri_library_name) (struct drm_device *dev, char *buf);
 
         /**
          * Called by \c drm_device_is_agp.  Typically used to determine if a
@@ -982,10 +983,8 @@ extern struct drm_sysfs_class *drm_sysfs_create(struct module *owner,
                                                 char *name);
 extern void drm_sysfs_destroy(struct drm_sysfs_class *cs);
 extern struct class_device *drm_sysfs_device_add(struct drm_sysfs_class *cs,
-                                                 dev_t dev,
-                                                 struct device *device,
-                                                 const char *fmt, ...);
-extern void drm_sysfs_device_remove(dev_t dev);
+                                                 drm_head_t *head);
+extern void drm_sysfs_device_remove(struct class_device *class_dev);
 
 /* Inline replacements for DRM_IOREMAP macros */
 static __inline__ void drm_core_ioremap(struct drm_map *map,
diff --git a/drivers/char/drm/drm_stub.c b/drivers/char/drm/drm_stub.c
index 8568a6b373a..b7f2a851f45 100644
--- a/drivers/char/drm/drm_stub.c
+++ b/drivers/char/drm/drm_stub.c
@@ -200,11 +200,7 @@ static int drm_get_head(drm_device_t * dev, drm_head_t * head)
                                 goto err_g1;
                         }
 
-                        head->dev_class = drm_sysfs_device_add(drm_class,
-                                                               MKDEV(DRM_MAJOR,
-                                                                     minor),
-                                                               &dev->pdev->dev,
-                                                               "card%d", minor);
+                        head->dev_class = drm_sysfs_device_add(drm_class, head);
                         if (IS_ERR(head->dev_class)) {
                                 printk(KERN_ERR
                                        "DRM: Error sysfs_device_add.\n");
@@ -317,10 +313,9 @@ int drm_put_head(drm_head_t * head)
         DRM_DEBUG("release secondary minor %d\n", minor);
 
         drm_proc_cleanup(minor, drm_proc_root, head->dev_root);
-        drm_sysfs_device_remove(MKDEV(DRM_MAJOR, head->minor));
+        drm_sysfs_device_remove(head->dev_class);
 
-        *head = (drm_head_t) {
-        .dev = NULL};
+        *head = (drm_head_t) {.dev = NULL};
 
         drm_heads[minor] = NULL;
 
diff --git a/drivers/char/drm/drm_sysfs.c b/drivers/char/drm/drm_sysfs.c
index 6d344976191..68e43ddc16a 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);
 }
diff --git a/drivers/char/drm/radeon_drv.c b/drivers/char/drm/radeon_drv.c
index 999d7451236..b04ed1b562b 100644
--- a/drivers/char/drm/radeon_drv.c
+++ b/drivers/char/drm/radeon_drv.c
@@ -42,6 +42,16 @@ int radeon_no_wb;
 MODULE_PARM_DESC(no_wb, "Disable AGP writeback for scratch registers\n");
 module_param_named(no_wb, radeon_no_wb, int, 0444);
 
+static int dri_library_name(struct drm_device *dev, char *buf)
+{
+        drm_radeon_private_t *dev_priv = dev->dev_private;
+        int family = dev_priv->flags & CHIP_FAMILY_MASK;
+
+        return snprintf(buf, PAGE_SIZE, "%s\n",
+                        (family < CHIP_R200) ? "radeon" :
+                        ((family < CHIP_R300) ? "r200" :
+                        "r300"));
+}
 
 static struct pci_device_id pciidlist[] = {
         radeon_PCI_IDS
@@ -61,6 +71,7 @@ static struct drm_driver driver = {
         .lastclose = radeon_driver_lastclose,
         .unload = radeon_driver_unload,
         .vblank_wait = radeon_driver_vblank_wait,
+        .dri_library_name = dri_library_name,
         .irq_preinstall = radeon_driver_irq_preinstall,
         .irq_postinstall = radeon_driver_irq_postinstall,
         .irq_uninstall = radeon_driver_irq_uninstall,
diff --git a/drivers/char/drm/radeon_drv.h b/drivers/char/drm/radeon_drv.h
index 3a91d5fc597..c37f2ea2078 100644
--- a/drivers/char/drm/radeon_drv.h
+++ b/drivers/char/drm/radeon_drv.h
@@ -103,8 +103,8 @@ enum radeon_family {
         CHIP_R100,
         CHIP_RS100,
         CHIP_RV100,
-        CHIP_R200,
         CHIP_RV200,
+        CHIP_R200,
         CHIP_RS200,
         CHIP_R250,
         CHIP_RS250,
diff --git a/drivers/char/drm/via_drv.c b/drivers/char/drm/via_drv.c
index 6f3e6b32fa8..e8adebdba12 100644
--- a/drivers/char/drm/via_drv.c
+++ b/drivers/char/drm/via_drv.c
@@ -29,6 +29,10 @@
 
 #include "drm_pciids.h"
 
+static int dri_library_name(struct drm_device *dev, char *buf)
+{
+        return snprintf(buf, PAGE_SIZE, "unichrome");
+}
 
 static struct pci_device_id pciidlist[] = {
         viadrv_PCI_IDS
@@ -61,6 +65,7 @@ static struct drm_driver driver = {
         .irq_uninstall = via_driver_irq_uninstall,
         .irq_handler = via_driver_irq_handler,
         .dma_quiescent = via_driver_dma_quiescent,
+        .dri_library_name = dri_library_name,
         .reclaim_buffers = drm_core_reclaim_buffers,
         .get_map_ofs = drm_core_get_map_ofs,
         .get_reg_ofs = drm_core_get_reg_ofs,