This patch adds support for exporting status of GPIO switches, configured as
gpio-keys buttons that generate events of type EV_SW, over standard gpiolib
sysfs interface. That way, switch state can be easily accessed from userspace
via a modern sysfs API in addition to traditional ioclt API, without the need
for adding a new, usualy controversial entry to sysfs interface.
Signed-off-by: Janusz Krzysztofik <jkrzyszt@xxxxxxxxxxxx>
---
diff -up linux-2.6.30-rc5/drivers/input/keyboard/gpio_keys.c.orig linux-2.6.30-rc5/drivers/input/keyboard/gpio_keys.c
--- linux-2.6.30-rc5/drivers/input/keyboard/gpio_keys.c.orig 2009-03-24 00:12:14.000000000 +0100
+++ linux-2.6.30-rc5/drivers/input/keyboard/gpio_keys.c 2009-06-04 21:31:19.000000000 +0200
@@ -157,6 +157,19 @@ static int __devinit gpio_keys_probe(str
wakeup = 1;
input_set_capability(input, type, button->code);
+
+ /* For GPIO buttons generating events of type EV_SW
+ * (ie switches), export their status
+ * over gpiolib sysfs interface if configured */
+#ifdef CONFIG_GPIO_SYSFS
+ if (type == EV_SW) {
+ error = gpio_export(button->gpio, false);
+ if (error)
+ pr_warning("gpio-keys: "
+ "failed to export GPIO %d, error %d\n",
+ button->gpio, error);
+ }
+#endif
}
error = input_register_device(input);
--
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