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, 11 insertions, 0 deletions

diff --git a/drivers/char/drm/radeon_drv.c b/drivers/char/drm/radeon_drv.c
index 999d74512362..b04ed1b562b9 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,