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keventd: add class/<subsystem>/<name> and driver/<name> conditions

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dev/<X> only fires when a device gets a /dev node, which leaves a lot of
embedded-relevant hardware uncoverable: DSA switch cores, IIO sensors,
LEDs, backlight, PHYs, regulators -- all live purely under sysfs.

Two new condition namespaces:

  class/<subsystem>/<sysname>  asserted on every sysfs class device add
                                (e.g. <class/leds/blue>)
  driver/<name>                 asserted while the driver is bound to at
                                least one device (e.g. <driver/mt7530>)

A driver can bind to several devices, so driver/ conditions are
refcounted: asserted on first bind, cleared when the last device is
unbound.

dev_cond() is generalized into a static cond_emit(prefix, rel, set) so
class_cond() and driver_cond() share the same mkpath + symlink/erase
code.  The name avoids colliding with src/cond.h's public cond_path()
helper (unrelated function that returns a condition's filesystem path).

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg
2026-08-16 22:03:34 +02:00
parent e4d9193f06
commit f3461ce2ba
6 changed files with 174 additions and 13 deletions
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src/cond.h
+4
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@@ -7,12 +7,16 @@
#define COND_BASE "finit/cond"
#define COND_DEV "dev/"
#define COND_DRIVER "driver/"
#define COND_CLASS "class/"
#define COND_PID "pid/"
#define COND_SYS "sys/"
#define COND_USR "usr/"
#define _PATH_COND _PATH_VARRUN COND_BASE "/"
#define _PATH_CONDDEV _PATH_COND COND_DEV
#define _PATH_CONDDRIVER _PATH_COND COND_DRIVER
#define _PATH_CONDCLASS _PATH_COND COND_CLASS
#define _PATH_CONDPID _PATH_COND COND_PID
#define _PATH_CONDSYS _PATH_COND COND_SYS
#define _PATH_CONDUSR _PATH_COND COND_USR