Fixed MTP to work with TWRP

drivers/uwb/pal.c

@@ -0,0 +1,137 @@
+/*
+ * UWB PAL support.
+ *
+ * Copyright (C) 2008 Cambridge Silicon Radio Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/kernel.h>
+#include <linux/debugfs.h>
+#include <linux/uwb.h>
+#include <linux/export.h>
+
+#include "uwb-internal.h"
+
+/**
+ * uwb_pal_init - initialize a UWB PAL
+ * @pal: the PAL to initialize
+ */
+void uwb_pal_init(struct uwb_pal *pal)
+{
+	INIT_LIST_HEAD(&pal->node);
+}
+EXPORT_SYMBOL_GPL(uwb_pal_init);
+
+/**
+ * uwb_pal_register - register a UWB PAL
+ * @pal: the PAL
+ *
+ * The PAL must be initialized with uwb_pal_init().
+ */
+int uwb_pal_register(struct uwb_pal *pal)
+{
+	struct uwb_rc *rc = pal->rc;
+	int ret;
+
+	if (pal->device) {
+		/* create a link to the uwb_rc in the PAL device's directory. */
+		ret = sysfs_create_link(&pal->device->kobj,
+					&rc->uwb_dev.dev.kobj, "uwb_rc");
+		if (ret < 0)
+			return ret;
+		/* create a link to the PAL in the UWB device's directory. */
+		ret = sysfs_create_link(&rc->uwb_dev.dev.kobj,
+					&pal->device->kobj, pal->name);
+		if (ret < 0) {
+			sysfs_remove_link(&pal->device->kobj, "uwb_rc");
+			return ret;
+		}
+	}
+
+	pal->debugfs_dir = uwb_dbg_create_pal_dir(pal);
+
+	mutex_lock(&rc->uwb_dev.mutex);
+	list_add(&pal->node, &rc->pals);
+	mutex_unlock(&rc->uwb_dev.mutex);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(uwb_pal_register);
+
+static int find_rc(struct device *dev, const void *data)
+{
+	const struct uwb_rc *target_rc = data;
+	struct uwb_rc *rc = dev_get_drvdata(dev);
+
+	if (rc == NULL) {
+		WARN_ON(1);
+		return 0;
+	}
+	if (rc == target_rc) {
+		if (rc->ready == 0)
+			return 0;
+		else
+			return 1;
+	}
+	return 0;
+}
+
+/**
+ * Given a radio controller descriptor see if it is registered.
+ *
+ * @returns false if the rc does not exist or is quiescing; true otherwise.
+ */
+static bool uwb_rc_class_device_exists(struct uwb_rc *target_rc)
+{
+	struct device *dev;
+
+	dev = class_find_device(&uwb_rc_class, NULL, target_rc,	find_rc);
+
+	return (dev != NULL);
+}
+
+/**
+ * uwb_pal_unregister - unregister a UWB PAL
+ * @pal: the PAL
+ */
+void uwb_pal_unregister(struct uwb_pal *pal)
+{
+	struct uwb_rc *rc = pal->rc;
+
+	uwb_radio_stop(pal);
+
+	mutex_lock(&rc->uwb_dev.mutex);
+	list_del(&pal->node);
+	mutex_unlock(&rc->uwb_dev.mutex);
+
+	debugfs_remove(pal->debugfs_dir);
+
+	if (pal->device) {
+		/* remove link to the PAL in the UWB device's directory. */
+		if (uwb_rc_class_device_exists(rc))
+			sysfs_remove_link(&rc->uwb_dev.dev.kobj, pal->name);
+
+		/* remove link to uwb_rc in the PAL device's directory. */
+		sysfs_remove_link(&pal->device->kobj, "uwb_rc");
+	}
+}
+EXPORT_SYMBOL_GPL(uwb_pal_unregister);
+
+/**
+ * uwb_rc_pal_init - initialize the PAL related parts of a radio controller
+ * @rc: the radio controller
+ */
+void uwb_rc_pal_init(struct uwb_rc *rc)
+{
+	INIT_LIST_HEAD(&rc->pals);
+}