[PATCH v2 1/4] drm: Put platform driver registration/unregistration loops in core.

[Eric Anholt <eric@anholt.net>]

This is mostly just a move of the code from exynos, with a slight
reformat.  I wanted to do a similar thing for vc4, and msm looks like
a good candidate as well.

Signed-off-by: Eric Anholt <eric@anholt.net>
---

v2: Move to the KMS helper config flag, and add our kerneldoc to
    drm.tmpl (under the "Driver Initialization" section), as requested
    by danvet.  Move to drm_platform_helper.c instead of _helpers.c to
    be consistent with other files.

 Documentation/DocBook/drm.tmpl          |  4 +++
 drivers/gpu/drm/Makefile                |  3 +-
 drivers/gpu/drm/drm_platform_helper.c   | 53 +++++++++++++++++++++++++++++++++
 drivers/gpu/drm/exynos/exynos_drm_drv.c | 38 ++++-------------------
 include/drm/drmP.h                      |  4 +++
 5 files changed, 69 insertions(+), 33 deletions(-)
 create mode 100644 drivers/gpu/drm/drm_platform_helper.c

diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl
index 9ddf8c6..1678d8f 100644
--- a/Documentation/DocBook/drm.tmpl
+++ b/Documentation/DocBook/drm.tmpl
@@ -465,6 +465,10 @@ char *date;</synopsis>
         </para>
       </sect3>
     </sect2>
+    <sect2>
+      <title>Platform Helper Functions Reference</title>
+!Edrivers/gpu/drm/drm_platform_helper.c
+    </sect2>
   </sect1>
 
   <!-- Internals: memory management -->
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 45e7719..8e3f251 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -21,7 +21,8 @@ drm-$(CONFIG_DRM_PANEL) += drm_panel.o
 drm-$(CONFIG_OF) += drm_of.o
 
 drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_probe_helper.o \
-		drm_plane_helper.o drm_dp_mst_topology.o drm_atomic_helper.o
+		drm_plane_helper.o drm_dp_mst_topology.o drm_atomic_helper.o \
+		drm_platform_helper.o
 drm_kms_helper-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o
 drm_kms_helper-$(CONFIG_DRM_FBDEV_EMULATION) += drm_fb_helper.o
 drm_kms_helper-$(CONFIG_DRM_KMS_CMA_HELPER) += drm_fb_cma_helper.o
diff --git a/drivers/gpu/drm/drm_platform_helper.c b/drivers/gpu/drm/drm_platform_helper.c
new file mode 100644
index 0000000..450846f
--- /dev/null
+++ b/drivers/gpu/drm/drm_platform_helper.c
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include <drm/drmP.h>
+
+/**
+ * drm_platform_register_drivers - Helper to register an array of
+ * struct platform_drivers wth platform_driver_register().
+ * @drv:   array of platform drivers to register
+ * @count: number of drivers in the array
+ *
+ * Use drm_platform_unregister_drivers() to undo this.
+ *
+ * Return: 0 on success, -errno value from the last
+ * platform_driver_register otherwise.
+ */
+int drm_platform_register_drivers(struct platform_driver *const *drv,
+				  int count)
+{
+	int i, ret;
+
+	for (i = 0; i < count; ++i) {
+		ret = platform_driver_register(drv[i]);
+		if (ret) {
+			while (--i >= 0)
+				platform_driver_unregister(drv[i]);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(drm_platform_register_drivers);
+
+/**
+ * drm_platform_unregister_drivers - Helper to unregister an array of
+ * struct platform_drivers.
+ * @drv:   array of platform drivers to unregister
+ * @count: number of drivers in the array
+ */
+void drm_platform_unregister_drivers(struct platform_driver *const *drv,
+				     int count)
+{
+	while (--count >= 0)
+		platform_driver_unregister(drv[count]);
+}
+EXPORT_SYMBOL_GPL(drm_platform_unregister_drivers);
diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
index fa5194c..83f829b 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
@@ -520,53 +520,27 @@ static int exynos_drm_register_devices(void)
 	return 0;
 }
 
-static void exynos_drm_unregister_drivers(struct platform_driver * const *drv,
-					  int count)
-{
-	while (--count >= 0)
-		platform_driver_unregister(drv[count]);
-}
-
-static int exynos_drm_register_drivers(struct platform_driver * const *drv,
-				       int count)
-{
-	int i, ret;
-
-	for (i = 0; i < count; ++i) {
-		ret = platform_driver_register(drv[i]);
-		if (!ret)
-			continue;
-
-		while (--i >= 0)
-			platform_driver_unregister(drv[i]);
-
-		return ret;
-	}
-
-	return 0;
-}
-
 static inline int exynos_drm_register_kms_drivers(void)
 {
-	return exynos_drm_register_drivers(exynos_drm_kms_drivers,
-					ARRAY_SIZE(exynos_drm_kms_drivers));
+	return drm_platform_register_drivers(exynos_drm_kms_drivers,
+					     ARRAY_SIZE(exynos_drm_kms_drivers));
 }
 
 static inline int exynos_drm_register_non_kms_drivers(void)
 {
-	return exynos_drm_register_drivers(exynos_drm_non_kms_drivers,
-					ARRAY_SIZE(exynos_drm_non_kms_drivers));
+	return drm_platform_register_drivers(exynos_drm_non_kms_drivers,
+					     ARRAY_SIZE(exynos_drm_non_kms_drivers));
 }
 
 static inline void exynos_drm_unregister_kms_drivers(void)
 {
-	exynos_drm_unregister_drivers(exynos_drm_kms_drivers,
+	drm_platform_unregister_drivers(exynos_drm_kms_drivers,
 					ARRAY_SIZE(exynos_drm_kms_drivers));
 }
 
 static inline void exynos_drm_unregister_non_kms_drivers(void)
 {
-	exynos_drm_unregister_drivers(exynos_drm_non_kms_drivers,
+	drm_platform_unregister_drivers(exynos_drm_non_kms_drivers,
 					ARRAY_SIZE(exynos_drm_non_kms_drivers));
 }
 
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 8b5ce7c..a774574 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1087,6 +1087,10 @@ extern int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *speed_mask);
 /* platform section */
 extern int drm_platform_init(struct drm_driver *driver, struct platform_device *platform_device);
 extern int drm_platform_set_busid(struct drm_device *d, struct drm_master *m);
+int drm_platform_register_drivers(struct platform_driver *const *drv,
+				  int count);
+void drm_platform_unregister_drivers(struct platform_driver *const *drv,
+				     int count);
 
 /* returns true if currently okay to sleep */
 static __inline__ bool drm_can_sleep(void)
-- 
2.1.4

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