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backlight: extend event support to also support poll() 

Extend the backlight event support to also allow the use of
poll()/select() on actual_brightness.

We already have the entire event hookup anyway, adding a single
function call in one line to get functionality like that is a really
good deal.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
hifive-unleashed-5.1
Henrique de Moraes Holschuh 2009-09-20 14:44:47 -03:00 committed by Richard Purdie
parent d822d5c273
commit 89dfc28ccb
1 changed files with 1 additions and 0 deletions
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drivers/video/backlight/backlight.c
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@ -91,6 +91,7 @@ static void backlight_generate_event(struct backlight_device *bd,
}
envp[1] = NULL;
kobject_uevent_env(&bd->dev.kobj, KOBJ_CHANGE, envp);
sysfs_notify(&bd->dev.kobj, NULL, "actual_brightness");
}
static ssize_t backlight_show_power(struct device *dev,