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d81c03f05e
These patches were generated from: https://github.com/raspberrypi/linux/commits/rpi-6.12.y With the following command: git format-patch -N v6.12.27..HEAD (HEAD -> 8d3206ee456a5ecdf9ddbfd8e5e231e4f0cd716e) Exceptions: - (def)configs patches - github workflows patches - applied & reverted patches - readme patches - wireless patches Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
101 lines
2.9 KiB
Diff
101 lines
2.9 KiB
Diff
From 7ac6f0393ced7e5ef80a6a99929c4897696ad3de Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Fri, 17 May 2024 17:35:25 +0100
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Subject: [PATCH] backlight: Add a display name to the core, and a function to
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set it
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The naming of backlight devices is not terribly useful for
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associating a backlight controller with a display (assuming
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it is attached to one).
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Add a sysfs node that will return a display name that can be set
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by other subsystems.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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drivers/video/backlight/backlight.c | 21 +++++++++++++++++++++
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include/linux/backlight.h | 15 +++++++++++++++
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2 files changed, 36 insertions(+)
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--- a/drivers/video/backlight/backlight.c
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+++ b/drivers/video/backlight/backlight.c
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@@ -287,6 +287,15 @@ static ssize_t max_brightness_show(struc
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}
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static DEVICE_ATTR_RO(max_brightness);
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+static ssize_t display_name_show(struct device *dev,
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+ struct device_attribute *attr, char *buf)
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+{
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+ struct backlight_device *bd = to_backlight_device(dev);
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+
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+ return sprintf(buf, "%s\n", bd->props.display_name);
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+}
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+static DEVICE_ATTR_RO(display_name);
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+
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static ssize_t actual_brightness_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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@@ -365,6 +374,7 @@ static struct attribute *bl_device_attrs
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&dev_attr_max_brightness.attr,
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&dev_attr_scale.attr,
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&dev_attr_type.attr,
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+ &dev_attr_display_name.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(bl_device);
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@@ -668,6 +678,17 @@ static int of_parent_match(struct device
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return dev->parent && dev->parent->of_node == data;
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}
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+int backlight_set_display_name(struct backlight_device *bd, const char *name)
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+{
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+ if (!bd)
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+ return -EINVAL;
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+
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+ strscpy_pad(bd->props.display_name, name, sizeof(bd->props.display_name));
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL(backlight_set_display_name);
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+
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/**
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* of_find_backlight_by_node() - find backlight device by device-tree node
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* @node: device-tree node of the backlight device
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--- a/include/linux/backlight.h
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+++ b/include/linux/backlight.h
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@@ -255,6 +255,13 @@ struct backlight_properties {
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* @scale: The type of the brightness scale.
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*/
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enum backlight_scale scale;
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+
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+#define BL_DISPLAY_NAME_LEN 32
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+ /**
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+ * @display_name: Optional name that can be registered to associate a
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+ * backlight device with a display device.
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+ */
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+ char display_name[BL_DISPLAY_NAME_LEN];
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};
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/**
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@@ -459,12 +466,20 @@ of_find_backlight_by_node(struct device_
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#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
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struct backlight_device *devm_of_find_backlight(struct device *dev);
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+int backlight_set_display_name(struct backlight_device *bd, const char *name);
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#else
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static inline struct backlight_device *
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devm_of_find_backlight(struct device *dev)
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{
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return NULL;
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}
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+
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+static inline int backlight_set_display_name(struct backlight_device *bd,
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+ const char *name)
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+{
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+ return 0;
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+}
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+
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#endif
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#endif
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