[PATCH 25/30] fbdev/core: Move framebuffer and backlight helpers into separate files

Thomas Zimmermann
2023-06-05T14:48:23Z

Move framebuffer and backlight helpers into separate files. Leave
fbsysfs.c to sysfs-related code. No functional changes.

The framebuffer helpers are not in fbmem.c because they are under
GPL-2.0-or-later copyright, while fbmem.c is GPL-2.0.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
drivers/video/fbdev/core/Makefile | 4 +-
drivers/video/fbdev/core/fb_backlight.c | 32 +++++++
drivers/video/fbdev/core/fb_info.c | 76 ++++++++++++++++
drivers/video/fbdev/core/fbsysfs.c | 110 +-----------------------
4 files changed, 112 insertions(+), 110 deletions(-)
create mode 100644 drivers/video/fbdev/core/fb_backlight.c
create mode 100644 drivers/video/fbdev/core/fb_info.c

diff --git a/drivers/video/fbdev/core/Makefile b/drivers/video/fbdev/core/Makefile
index 8f0060160ffb..eee3295bc225 100644
--- a/drivers/video/fbdev/core/Makefile
+++ b/drivers/video/fbdev/core/Makefile
@@ -1,7 +1,9 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_FB_NOTIFY) += fb_notify.o
obj-$(CONFIG_FB) += fb.o
-fb-y := fbmem.o fbmon.o fbcmap.o fbsysfs.o \
+fb-y := fb_backlight.o \
+ fb_info.o \
+ fbmem.o fbmon.o fbcmap.o fbsysfs.o \
modedb.o fbcvt.o fb_cmdline.o fb_io_fops.o
fb-$(CONFIG_FB_DEFERRED_IO) += fb_defio.o

diff --git a/drivers/video/fbdev/core/fb_backlight.c b/drivers/video/fbdev/core/fb_backlight.c
new file mode 100644
index 000000000000..feffe6c68039
--- /dev/null
+++ b/drivers/video/fbdev/core/fb_backlight.c
@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/export.h>
+#include <linux/fb.h>
+
+#if IS_ENABLED(CONFIG_FB_BACKLIGHT)
+/*
+ * This function generates a linear backlight curve
+ *
+ * 0: off
+ * 1-7: min
+ * 8-127: linear from min to max
+ */
+void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max)
+{
+ unsigned int i, flat, count, range = (max - min);
+
+ mutex_lock(&fb_info->bl_curve_mutex);
+
+ fb_info->bl_curve[0] = off;
+
+ for (flat = 1; flat < (FB_BACKLIGHT_LEVELS / 16); ++flat)
+ fb_info->bl_curve[flat] = min;
+
+ count = FB_BACKLIGHT_LEVELS * 15 / 16;
+ for (i = 0; i < count; ++i)
+ fb_info->bl_curve[flat + i] = min + (range * (i + 1) / count);
+
+ mutex_unlock(&fb_info->bl_curve_mutex);
+}
+EXPORT_SYMBOL_GPL(fb_bl_default_curve);
+#endif
diff --git a/drivers/video/fbdev/core/fb_info.c b/drivers/video/fbdev/core/fb_info.c
new file mode 100644
index 000000000000..fb5b75009ee7
--- /dev/null
+++ b/drivers/video/fbdev/core/fb_info.c
@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/export.h>
+#include <linux/fb.h>
+
+/**
+ * framebuffer_alloc - creates a new frame buffer info structure
+ *
+ * @size: size of driver private data, can be zero
+ * @dev: pointer to the device for this fb, this can be NULL
+ *
+ * Creates a new frame buffer info structure. Also reserves @size bytes
+ * for driver private data (info->par). info->par (if any) will be
+ * aligned to sizeof(long).
+ *
+ * Returns the new structure, or NULL if an error occurred.
+ *
+ */
+struct fb_info *framebuffer_alloc(size_t size, struct device *dev)
+{
+#define BYTES_PER_LONG (BITS_PER_LONG/8)
+#define PADDING (BYTES_PER_LONG - (sizeof(struct fb_info) % BYTES_PER_LONG))
+ int fb_info_size = sizeof(struct fb_info);
+ struct fb_info *info;
+ char *p;
+
+ if (size)
+ fb_info_size += PADDING;
+
+ p = kzalloc(fb_info_size + size, GFP_KERNEL);
+
+ if (!p)
+ return NULL;
+
+ info = (struct fb_info *) p;
+
+ if (size)
+ info->par = p + fb_info_size;
+
+ info->device = dev;
+ info->fbcon_rotate_hint = -1;
+
+#if IS_ENABLED(CONFIG_FB_BACKLIGHT)
+ mutex_init(&info->bl_curve_mutex);
+#endif
+
+ return info;
+#undef PADDING
+#undef BYTES_PER_LONG
+}
+EXPORT_SYMBOL(framebuffer_alloc);
+
+/**
+ * framebuffer_release - marks the structure available for freeing
+ *
+ * @info: frame buffer info structure
+ *
+ * Drop the reference count of the device embedded in the
+ * framebuffer info structure.
+ *
+ */
+void framebuffer_release(struct fb_info *info)
+{
+ if (!info)
+ return;
+
+ if (WARN_ON(refcount_read(&info->count)))
+ return;
+
+#if IS_ENABLED(CONFIG_FB_BACKLIGHT)
+ mutex_destroy(&info->bl_curve_mutex);
+#endif
+
+ kfree(info);
+}
+EXPORT_SYMBOL(framebuffer_release);
diff --git a/drivers/video/fbdev/core/fbsysfs.c b/drivers/video/fbdev/core/fbsysfs.c
index 0c33c4adcd79..849073f1ca06 100644
--- a/drivers/video/fbdev/core/fbsysfs.c
+++ b/drivers/video/fbdev/core/fbsysfs.c
@@ -5,93 +5,12 @@
* Copyright (c) 2004 James Simmons <jsimmons@infradead.org>
*/

-/*
- * Note: currently there's only stubs for framebuffer_alloc and
- * framebuffer_release here. The reson for that is that until all drivers
- * are converted to use it a sysfsification will open OOPSable races.
- */
-
-#include <linux/kernel.h>
-#include <linux/slab.h>
+#include <linux/console.h>
#include <linux/fb.h>
#include <linux/fbcon.h>
-#include <linux/console.h>
-#include <linux/module.h>

#define FB_SYSFS_FLAG_ATTR 1

-/**
- * framebuffer_alloc - creates a new frame buffer info structure
- *
- * @size: size of driver private data, can be zero
- * @dev: pointer to the device for this fb, this can be NULL
- *
- * Creates a new frame buffer info structure. Also reserves @size bytes
- * for driver private data (info->par). info->par (if any) will be
- * aligned to sizeof(long).
- *
- * Returns the new structure, or NULL if an error occurred.
- *
- */
-struct fb_info *framebuffer_alloc(size_t size, struct device *dev)
-{
-#define BYTES_PER_LONG (BITS_PER_LONG/8)
-#define PADDING (BYTES_PER_LONG - (sizeof(struct fb_info) % BYTES_PER_LONG))
- int fb_info_size = sizeof(struct fb_info);
- struct fb_info *info;
- char *p;
-
- if (size)
- fb_info_size += PADDING;
-
- p = kzalloc(fb_info_size + size, GFP_KERNEL);
-
- if (!p)
- return NULL;
-
- info = (struct fb_info *) p;
-
- if (size)
- info->par = p + fb_info_size;
-
- info->device = dev;
- info->fbcon_rotate_hint = -1;
-
-#if IS_ENABLED(CONFIG_FB_BACKLIGHT)
- mutex_init(&info->bl_curve_mutex);
-#endif
-
- return info;
-#undef PADDING
-#undef BYTES_PER_LONG
-}
-EXPORT_SYMBOL(framebuffer_alloc);
-
-/**
- * framebuffer_release - marks the structure available for freeing
- *
- * @info: frame buffer info structure
- *
- * Drop the reference count of the device embedded in the
- * framebuffer info structure.
- *
- */
-void framebuffer_release(struct fb_info *info)
-{
- if (!info)
- return;
-
- if (WARN_ON(refcount_read(&info->count)))
- return;
-
-#if IS_ENABLED(CONFIG_FB_BACKLIGHT)
- mutex_destroy(&info->bl_curve_mutex);
-#endif
-
- kfree(info);
-}
-EXPORT_SYMBOL(framebuffer_release);
-
static int activate(struct fb_info *fb_info, struct fb_var_screeninfo *var)
{
int err;
@@ -551,30 +470,3 @@ void fb_cleanup_device(struct fb_info *fb_info)
fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
}
}
-
-#if IS_ENABLED(CONFIG_FB_BACKLIGHT)
-/* This function generates a linear backlight curve
- *
- * 0: off
- * 1-7: min
- * 8-127: linear from min to max
- */
-void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max)
-{
- unsigned int i, flat, count, range = (max - min);
-
- mutex_lock(&fb_info->bl_curve_mutex);
-
- fb_info->bl_curve[0] = off;
-
- for (flat = 1; flat < (FB_BACKLIGHT_LEVELS / 16); ++flat)
- fb_info->bl_curve[flat] = min;
-
- count = FB_BACKLIGHT_LEVELS * 15 / 16;
- for (i = 0; i < count; ++i)
- fb_info->bl_curve[flat + i] = min + (range * (i + 1) / count);
-
- mutex_unlock(&fb_info->bl_curve_mutex);
-}
-EXPORT_SYMBOL_GPL(fb_bl_default_curve);
-#endif
--
2.40.1