Expose the global state of rfkill through sysfs. Userspace can now:
1. Check the current state, enter or exit EPO through the
emergency_power_off attribute;
2. Restore to the state before the last EPO through a write to the
restore_saved_state attribute;
Signed-off-by: Henrique de Moraes Holschuh <hmh@xxxxxxxxxx>
Cc: Ivo van Doorn <IvDoorn@xxxxxxxxx>
---
net/rfkill/rfkill.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 64 insertions(+), 0 deletions(-)
diff --git a/net/rfkill/rfkill.c b/net/rfkill/rfkill.c
index 703eb4d..901e6c2 100644
--- a/net/rfkill/rfkill.c
+++ b/net/rfkill/rfkill.c
@@ -945,9 +945,73 @@ static ssize_t rfkill_attr_available_types_show(struct device *dev,
return c;
}
+static ssize_t rfkill_attr_emergency_power_off_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%u\n",
+ rfkill_epo_lock_active ? 1 : 0);
+}
+
+static ssize_t rfkill_attr_emergency_power_off_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned long l;
+ int error;
+
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ error = strict_strtoul(buf, 0, &l);
+ if (error)
+ return error;
+
+ if (l > 1)
+ return -EINVAL;
+
+ if (l)
+ rfkill_epo();
+ else
+ rfkill_remove_epo_lock();
+
+ return count;
+}
+
+static ssize_t rfkill_attr_restore_saved_state_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned long l;
+ int error;
+
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ error = strict_strtoul(buf, 0, &l);
+ if (error)
+ return error;
+
+ if (l > 1)
+ return -EINVAL;
+
+ /* For userspace, require explicit unlock */
+ if (rfkill_epo_lock_active)
+ return -EPERM;
+
+ if (l)
+ rfkill_restore_states();
+
+ return count;
+}
+
static struct device_attribute rfkill_g_attrs[] = {
__ATTR(available_types, S_IRUGO,
rfkill_attr_available_types_show, NULL),
+ __ATTR(emergency_power_off, S_IWUSR | S_IRUGO,
+ rfkill_attr_emergency_power_off_show,
+ rfkill_attr_emergency_power_off_store),
+ __ATTR(restore_saved_state, S_IWUSR,
+ NULL, rfkill_attr_restore_saved_state_store),
__ATTR_NULL
};
--
1.6.2.1
--
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