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@@ -0,0 +1,407 @@
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+/*
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+ * Copyright (C) 2006 Ivo van Doorn
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+ * Copyright (C) 2007 Dmitry Torokhov
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the
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+ * Free Software Foundation, Inc.,
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+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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+ */
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+
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/init.h>
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+#include <linux/workqueue.h>
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+#include <linux/capability.h>
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+#include <linux/list.h>
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+#include <linux/mutex.h>
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+#include <linux/rfkill.h>
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+
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+MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
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+MODULE_VERSION("1.0");
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+MODULE_DESCRIPTION("RF switch support");
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+MODULE_LICENSE("GPL");
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+
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+static LIST_HEAD(rfkill_list); /* list of registered rf switches */
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+static DEFINE_MUTEX(rfkill_mutex);
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+
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+static enum rfkill_state rfkill_states[RFKILL_TYPE_MAX];
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+
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+static int rfkill_toggle_radio(struct rfkill *rfkill,
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+ enum rfkill_state state)
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+{
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+ int retval;
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+
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+ retval = mutex_lock_interruptible(&rfkill->mutex);
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+ if (retval)
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+ return retval;
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+
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+ if (state != rfkill->state) {
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+ retval = rfkill->toggle_radio(rfkill->data, state);
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+ if (!retval)
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+ rfkill->state = state;
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+ }
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+
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+ mutex_unlock(&rfkill->mutex);
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+ return retval;
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+}
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+
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+/**
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+ * rfkill_switch_all - Toggle state of all switches of given type
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+ * @type: type of interfaces to be affeceted
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+ * @state: the new state
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+ *
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+ * This function toggles state of all switches of given type unless
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+ * a specific switch is claimed by userspace in which case it is
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+ * left alone.
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+ */
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+
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+void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state)
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+{
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+ struct rfkill *rfkill;
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+
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+ mutex_lock(&rfkill_mutex);
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+
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+ rfkill_states[type] = state;
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+
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+ list_for_each_entry(rfkill, &rfkill_list, node) {
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+ if (!rfkill->user_claim)
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+ rfkill_toggle_radio(rfkill, state);
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+ }
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+
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+ mutex_unlock(&rfkill_mutex);
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+}
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+EXPORT_SYMBOL(rfkill_switch_all);
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+
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+static ssize_t rfkill_name_show(struct device *dev,
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+ struct device_attribute *attr,
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+ char *buf)
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+{
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+ struct rfkill *rfkill = to_rfkill(dev);
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+
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+ return sprintf(buf, "%s\n", rfkill->name);
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+}
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+
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+static ssize_t rfkill_type_show(struct device *dev,
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+ struct device_attribute *attr,
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+ char *buf)
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+{
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+ struct rfkill *rfkill = to_rfkill(dev);
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+ const char *type;
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+
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+ switch (rfkill->type) {
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+ case RFKILL_TYPE_WLAN:
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+ type = "wlan";
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+ break;
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+ case RFKILL_TYPE_BLUETOOTH:
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+ type = "bluetooth";
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+ break;
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+ case RFKILL_TYPE_IRDA:
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+ type = "irda";
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+ break;
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+ default:
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+ BUG();
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+ }
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+
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+ return sprintf(buf, "%s\n", type);
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+}
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+
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+static ssize_t rfkill_state_show(struct device *dev,
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+ struct device_attribute *attr,
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+ char *buf)
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+{
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+ struct rfkill *rfkill = to_rfkill(dev);
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+
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+ return sprintf(buf, "%d\n", rfkill->state);
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+}
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+
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+static ssize_t rfkill_state_store(struct device *dev,
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+ struct device_attribute *attr,
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+ const char *buf, size_t count)
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+{
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+ struct rfkill *rfkill = to_rfkill(dev);
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+ unsigned int state = simple_strtoul(buf, NULL, 0);
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+ int error;
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+
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+ if (!capable(CAP_NET_ADMIN))
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+ return -EPERM;
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+
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+ error = rfkill_toggle_radio(rfkill,
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+ state ? RFKILL_STATE_ON : RFKILL_STATE_OFF);
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+ if (error)
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+ return error;
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+
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+ return count;
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+}
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+
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+static ssize_t rfkill_claim_show(struct device *dev,
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+ struct device_attribute *attr,
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+ char *buf)
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+{
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+ struct rfkill *rfkill = to_rfkill(dev);
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+
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+ return sprintf(buf, "%d", rfkill->user_claim);
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+}
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+
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+static ssize_t rfkill_claim_store(struct device *dev,
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+ struct device_attribute *attr,
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+ const char *buf, size_t count)
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+{
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+ struct rfkill *rfkill = to_rfkill(dev);
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+ bool claim = !!simple_strtoul(buf, NULL, 0);
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+ int error;
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+
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+ if (!capable(CAP_NET_ADMIN))
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+ return -EPERM;
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+
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+ /*
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+ * Take the global lock to make sure the kernel is not in
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+ * the middle of rfkill_switch_all
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+ */
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+ error = mutex_lock_interruptible(&rfkill_mutex);
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+ if (error)
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+ return error;
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+
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+ if (rfkill->user_claim != claim) {
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+ if (!claim)
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+ rfkill_toggle_radio(rfkill,
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+ rfkill_states[rfkill->type]);
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+ rfkill->user_claim = claim;
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+ }
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+
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+ mutex_unlock(&rfkill_mutex);
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+
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+ return count;
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+}
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+
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+static struct device_attribute rfkill_dev_attrs[] = {
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+ __ATTR(name, S_IRUGO, rfkill_name_show, NULL),
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+ __ATTR(type, S_IRUGO, rfkill_type_show, NULL),
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+ __ATTR(state, S_IRUGO, rfkill_state_show, rfkill_state_store),
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+ __ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store),
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+ __ATTR_NULL
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+};
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+
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+static void rfkill_release(struct device *dev)
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+{
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+ struct rfkill *rfkill = to_rfkill(dev);
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+
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+ kfree(rfkill);
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+ module_put(THIS_MODULE);
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+}
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+
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+#ifdef CONFIG_PM
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+static int rfkill_suspend(struct device *dev, pm_message_t state)
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+{
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+ struct rfkill *rfkill = to_rfkill(dev);
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+
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+ if (dev->power.power_state.event != state.event) {
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+ if (state.event == PM_EVENT_SUSPEND) {
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+ mutex_lock(&rfkill->mutex);
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+
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+ if (rfkill->state == RFKILL_STATE_ON)
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+ rfkill->toggle_radio(rfkill->data,
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+ RFKILL_STATE_OFF);
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+
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+ mutex_unlock(&rfkill->mutex);
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+ }
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+
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+ dev->power.power_state = state;
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+ }
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+
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+ return 0;
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+}
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+
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+static int rfkill_resume(struct device *dev)
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+{
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+ struct rfkill *rfkill = to_rfkill(dev);
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+
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+ if (dev->power.power_state.event != PM_EVENT_ON) {
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+ mutex_lock(&rfkill->mutex);
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+
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+ if (rfkill->state == RFKILL_STATE_ON)
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+ rfkill->toggle_radio(rfkill->data, RFKILL_STATE_ON);
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+
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+ mutex_unlock(&rfkill->mutex);
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+ }
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+
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+ dev->power.power_state = PMSG_ON;
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+ return 0;
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+}
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+#else
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+#define rfkill_suspend NULL
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+#define rfkill_resume NULL
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+#endif
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+
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+static struct class rfkill_class = {
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+ .name = "rfkill",
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+ .dev_release = rfkill_release,
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+ .dev_attrs = rfkill_dev_attrs,
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+ .suspend = rfkill_suspend,
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+ .resume = rfkill_resume,
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+};
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+
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+static int rfkill_add_switch(struct rfkill *rfkill)
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+{
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+ int retval;
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+
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+ retval = mutex_lock_interruptible(&rfkill_mutex);
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+ if (retval)
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+ return retval;
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+
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+ retval = rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type]);
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+ if (retval)
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+ goto out;
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+
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+ list_add_tail(&rfkill->node, &rfkill_list);
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+
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+ out:
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+ mutex_unlock(&rfkill_mutex);
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+ return retval;
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+}
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+
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+static void rfkill_remove_switch(struct rfkill *rfkill)
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+{
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+ mutex_lock(&rfkill_mutex);
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+ list_del_init(&rfkill->node);
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+ rfkill_toggle_radio(rfkill, RFKILL_STATE_OFF);
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+ mutex_unlock(&rfkill_mutex);
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+}
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+
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+/**
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+ * rfkill_allocate - allocate memory for rfkill structure.
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+ * @parent: device that has rf switch on it
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+ * @type: type of the switch (wlan, bluetooth, irda)
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+ *
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+ * This function should be called by the network driver when it needs
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+ * rfkill structure. Once the structure is allocated the driver shoud
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+ * finish its initialization by setting name, private data, enable_radio
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+ * and disable_radio methods and then register it with rfkill_register().
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+ * NOTE: If registration fails the structure shoudl be freed by calling
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+ * rfkill_free() otherwise rfkill_unregister() should be used.
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+ */
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+struct rfkill *rfkill_allocate(struct device *parent, enum rfkill_type type)
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+{
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+ struct rfkill *rfkill;
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+ struct device *dev;
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+
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+ rfkill = kzalloc(sizeof(struct rfkill), GFP_KERNEL);
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+ if (rfkill)
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+ return NULL;
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+
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+ mutex_init(&rfkill->mutex);
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+ INIT_LIST_HEAD(&rfkill->node);
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+ rfkill->type = type;
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+
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+ dev = &rfkill->dev;
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+ dev->class = &rfkill_class;
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+ dev->parent = parent;
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+ device_initialize(dev);
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+
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+ __module_get(THIS_MODULE);
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+
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+ return rfkill;
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+}
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+EXPORT_SYMBOL(rfkill_allocate);
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+
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+/**
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+ * rfkill_free - Mark rfkill structure for deletion
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+ * @rfkill: rfkill structure to be destroyed
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+ *
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+ * Decrements reference count of rfkill structure so it is destoryed.
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+ * Note that rfkill_free() should _not_ be called after rfkill_unregister().
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+ */
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+void rfkill_free(struct rfkill *rfkill)
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+{
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+ if (rfkill)
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+ put_device(&rfkill->dev);
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+}
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+EXPORT_SYMBOL(rfkill_free);
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+
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+/**
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+ * rfkill_register - Register a rfkill structure.
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+ * @rfkill: rfkill structure to be registered
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+ *
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+ * This function should be called by the network driver when the rfkill
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+ * structure needs to be registered. Immediately from registration the
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+ * switch driver should be able to service calls to toggle_radio.
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+ */
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+int rfkill_register(struct rfkill *rfkill)
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+{
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+ static atomic_t rfkill_no = ATOMIC_INIT(0);
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+ struct device *dev = &rfkill->dev;
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+ int error;
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+
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+ if (!rfkill->toggle_radio)
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+ return -EINVAL;
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+
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+ error = rfkill_add_switch(rfkill);
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+ if (error)
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+ return error;
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+
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+ snprintf(dev->bus_id, sizeof(dev->bus_id),
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+ "rfkill%ld", (long)atomic_inc_return(&rfkill_no) - 1);
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+
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+ error = device_add(dev);
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+ if (error) {
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+ rfkill_remove_switch(rfkill);
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+ return error;
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+ }
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL(rfkill_register);
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+
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+/**
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+ * rfkill_unregister - Uegister a rfkill structure.
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+ * @rfkill: rfkill structure to be unregistered
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+ *
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+ * This function should be called by the network driver during device
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+ * teardown to destroy rfkill structure. Note that rfkill_free() should
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+ * _not_ be called after rfkill_unregister().
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+ */
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+void rfkill_unregister(struct rfkill *rfkill)
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+{
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+ device_del(&rfkill->dev);
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+ rfkill_remove_switch(rfkill);
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+ put_device(&rfkill->dev);
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+}
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+EXPORT_SYMBOL(rfkill_unregister);
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+
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+/*
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+ * Rfkill module initialization/deinitialization.
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+ */
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+static int __init rfkill_init(void)
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+{
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+ int error;
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+ int i;
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+
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+ for (i = 0; i < ARRAY_SIZE(rfkill_states); i++)
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+ rfkill_states[i] = RFKILL_STATE_ON;
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+
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+ error = class_register(&rfkill_class);
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+ if (error) {
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+ printk(KERN_ERR "rfkill: unable to register rfkill class\n");
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+ return error;
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+ }
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+
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+ return 0;
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+}
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+
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+static void __exit rfkill_exit(void)
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+{
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+ class_unregister(&rfkill_class);
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+}
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+
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+module_init(rfkill_init);
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+module_exit(rfkill_exit);
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Linus Torvalds