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authorDaniel Kurtz <djkurtz@chromium.org>2012-03-28 02:36:14 +0800
committerDaniel Vetter <daniel.vetter@ffwll.ch>2012-03-28 14:40:44 +0200
commit3bd7d90938f1fe77de5991dc4b727843c4980b2a (patch)
treea3ae0f53674b8a95b8e2c52959e32b4cc7a43d09 /drivers/gpu/drm/i915/intel_i2c.c
parent489fbc107f5fb041d598f30f367ea3ca714ff133 (diff)
drm/i915/intel_i2c: refactor using intel_gmbus_get_adapter
Instead of letting other modules directly access the ->gmbus array, introduce intel_gmbus_get_adapter() for looking up an i2c_adapter for a given gmbus port identifier. This will enable later refactoring of the gmbus port list. Note: Before requesting an adapter for a given gmbus port number, the driver must first check its validity using i2c_intel_gmbus_is_port_valid(). If this check fails, a call to intel_gmbus_get_adapter() will WARN_ON and return NULL. This is relevant for parts of the driver that read a port from VBIOS, which might be improperly initialized and contain an invalid port. In these cases, the driver must fall back to using a safer default port. Signed-off-by: Daniel Kurtz <djkurtz@chromium.org> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_i2c.c')
-rw-r--r--drivers/gpu/drm/i915/intel_i2c.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
index 1bb63624a793..2f65d01340ff 100644
--- a/drivers/gpu/drm/i915/intel_i2c.c
+++ b/drivers/gpu/drm/i915/intel_i2c.c
@@ -449,6 +449,14 @@ err:
return ret;
}
+struct i2c_adapter *intel_gmbus_get_adapter(struct drm_i915_private *dev_priv,
+ unsigned port)
+{
+ WARN_ON(!intel_gmbus_is_port_valid(port));
+ return (intel_gmbus_is_port_valid(port)) ?
+ &dev_priv->gmbus[port].adapter : NULL;
+}
+
void intel_gmbus_set_speed(struct i2c_adapter *adapter, int speed)
{
struct intel_gmbus *bus = to_intel_gmbus(adapter);