The ovl_* files documented in
Documentation/ABI/testing/sysfs-devices-platform-sh_mobile_lcdc_fb no
longer exist.
Commit a979182a2453 ("fbdev: lcdcfb: Register sysfs groups through driver
core") moved the attributes from each overlay's framebuffer device to
the platform driver's dev_groups and renamed them overlay_*. There is
now only one set of attributes for the whole LCDC. The callbacks still
expect dev_get_drvdata() to return a struct fb_info, but the platform
device holds struct sh_mobile_lcdc_priv, so they access the wrong
structure.
Restore the documented names and register the group on each overlay's
framebuffer device with device_add_groups(). Remove it with
device_remove_groups() before unregistering the framebuffer. Skip
creation when dev_of_fbinfo(info) is NULL, as the old device_create_file()
calls did.
Drop the CONFIG_FB_DEVICE guard, since the driver already depends on it.
Fixes: a979182a2453 ("fbdev: lcdcfb: Register sysfs groups through driver core")
Cc: [email protected]
Assisted-by: LLM
Signed-off-by: Karl Mehltretter <[email protected]>
---
Changes in v2:
- Use dev_of_fbinfo() for overlay sysfs registration and removal (Helge).
v1: https://lore.kernel.org/r/[email protected]/
Found while reviewing the sysfs ABI documentation. Shixiong confirmed
that using the platform driver's dev_groups is wrong here.
Compile-tested with Clang 22.1.8, ARCH=arm and W=1, using multi_v7_defconfig
with COMPILE_TEST=y, FB_DEVICE=y and FB_SH_MOBILE_LCDC=m.
Also checked FB_DEVICE=n: olddefconfig disables FB_SH_MOBILE_LCDC because
of its existing Kconfig dependency, and the framebuffer core compiles.
This does not test the driver with FB_DEVICE=n; removing that dependency
requires additional changes outside the overlay sysfs paths.
No runtime test; I have no SH-Mobile hardware.
drivers/video/fbdev/sh_mobile_lcdcfb.c | 39 +++++++++++++++++---------
1 file changed, 25 insertions(+), 14 deletions(-)
diff --git a/drivers/video/fbdev/sh_mobile_lcdcfb.c
b/drivers/video/fbdev/sh_mobile_lcdcfb.c
index e8324b01700f..5743c96d5481 100644
--- a/drivers/video/fbdev/sh_mobile_lcdcfb.c
+++ b/drivers/video/fbdev/sh_mobile_lcdcfb.c
@@ -1337,22 +1337,24 @@ overlay_rop3_store(struct device *dev, struct
device_attribute *attr,
return count;
}
-static DEVICE_ATTR_RW(overlay_alpha);
-static DEVICE_ATTR_RW(overlay_mode);
-static DEVICE_ATTR_RW(overlay_position);
-static DEVICE_ATTR_RW(overlay_rop3);
-
-static struct attribute *overlay_sysfs_attrs[] __maybe_unused = {
- &dev_attr_overlay_alpha.attr,
- &dev_attr_overlay_mode.attr,
- &dev_attr_overlay_position.attr,
- &dev_attr_overlay_rop3.attr,
+static struct device_attribute dev_attr_ovl_alpha =
+ __ATTR(ovl_alpha, 0644, overlay_alpha_show, overlay_alpha_store);
+static struct device_attribute dev_attr_ovl_mode =
+ __ATTR(ovl_mode, 0644, overlay_mode_show, overlay_mode_store);
+static struct device_attribute dev_attr_ovl_position =
+ __ATTR(ovl_position, 0644, overlay_position_show,
overlay_position_store);
+static struct device_attribute dev_attr_ovl_rop3 =
+ __ATTR(ovl_rop3, 0644, overlay_rop3_show, overlay_rop3_store);
+
+static struct attribute *overlay_sysfs_attrs[] = {
+ &dev_attr_ovl_alpha.attr,
+ &dev_attr_ovl_mode.attr,
+ &dev_attr_ovl_position.attr,
+ &dev_attr_ovl_rop3.attr,
NULL,
};
-#ifdef CONFIG_FB_DEVICE
ATTRIBUTE_GROUPS(overlay_sysfs);
-#endif
static const struct fb_fix_screeninfo sh_mobile_lcdc_overlay_fix = {
.id = "SH Mobile LCDC",
@@ -1510,9 +1512,10 @@ sh_mobile_lcdc_overlay_fb_unregister(struct
sh_mobile_lcdc_overlay *ovl)
{
struct fb_info *info = ovl->info;
- if (info == NULL || info->dev == NULL)
+ if (!info || !dev_of_fbinfo(info))
return;
+ device_remove_groups(dev_of_fbinfo(info), overlay_sysfs_groups);
unregister_framebuffer(ovl->info);
}
@@ -1530,6 +1533,15 @@ sh_mobile_lcdc_overlay_fb_register(struct
sh_mobile_lcdc_overlay *ovl)
if (ret < 0)
return ret;
+ /* The framebuffer device is optional, see fb_device_create(). */
+ if (dev_of_fbinfo(info)) {
+ ret = device_add_groups(dev_of_fbinfo(info),
overlay_sysfs_groups);
+ if (ret < 0) {
+ unregister_framebuffer(info);
+ return ret;
+ }
+ }
+
dev_info(lcdc->dev, "registered %s/overlay %u as %dx%d %dbpp.\n",
dev_name(lcdc->dev), ovl->index, info->var.xres,
info->var.yres, info->var.bits_per_pixel);
@@ -2637,7 +2649,6 @@ static int sh_mobile_lcdc_probe(struct platform_device
*pdev)
static struct platform_driver sh_mobile_lcdc_driver = {
.driver = {
.name = "sh_mobile_lcdc_fb",
- .dev_groups = overlay_sysfs_groups,
.pm = &sh_mobile_lcdc_dev_pm_ops,
},
.probe = sh_mobile_lcdc_probe,
base-commit: 986c24e0fe44f844b44d365b71ce831947f50298
--
2.39.5 (Apple Git-154)
