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Message-ID: <20160916132357.GE31174@kroah.com>
Date: Fri, 16 Sep 2016 15:23:57 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Cc: Johan Hovold <johan@...oldconsulting.com>,
Rui Miguel Silva <rmfrfs@...il.com>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Sandeep Patil <sspatil@...gle.com>,
Matt Porter <mporter@...nel.crashing.org>,
John Stultz <john.stultz@...aro.org>,
Rob Herring <robh@...nel.org>,
Viresh Kumar <viresh.kumar@...aro.org>,
Alex Elder <elder@...aro.org>, David Lin <dtwlin@...gle.com>,
Bryan O'Donoghue <pure.logic@...us-software.ie>,
Vaibhav Agarwal <vaibhav.agarwal@...aro.org>,
Mark Greer <mgreer@...malcreek.com>
Subject: [patch 07/32] greybus: core code
This is the core Greybus code. It implements the greybus protocol and
is the base of where all other greybus drivers tie into.
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/greybus/arpc.h | 109 +++
drivers/greybus/authentication.c | 429 ++++++++++++++
drivers/greybus/bundle.c | 253 ++++++++
drivers/greybus/bundle.h | 90 ++
drivers/greybus/connection.c | 938 +++++++++++++++++++++++++++++++
drivers/greybus/connection.h | 129 ++++
drivers/greybus/control.c | 635 ++++++++++++++++++++
drivers/greybus/control.h | 65 ++
drivers/greybus/core.c | 361 +++++++++++
drivers/greybus/debugfs.c | 31 +
drivers/greybus/greybus.h | 154 +++++
drivers/greybus/greybus_authentication.h | 120 +++
drivers/greybus/greybus_id.h | 26
drivers/greybus/greybus_manifest.h | 177 +++++
drivers/greybus/manifest.c | 535 +++++++++++++++++
drivers/greybus/manifest.h | 16
drivers/greybus/module.c | 238 +++++++
drivers/greybus/module.h | 34 +
18 files changed, 4340 insertions(+)
--- /dev/null
+++ b/drivers/greybus/arpc.h
@@ -0,0 +1,109 @@
+/*
+ * This file is provided under a dual BSD/GPLv2 license. When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2016 Google Inc. All rights reserved.
+ * Copyright(c) 2016 Linaro Ltd. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License 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 version 2 for more details.
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2016 Google Inc. All rights reserved.
+ * Copyright(c) 2016 Linaro Ltd. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. or Linaro Ltd. nor the names of
+ * its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written
+ * permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GOOGLE INC. OR
+ * LINARO LTD. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __ARPC_H
+#define __ARPC_H
+
+/* APBridgeA RPC (ARPC) */
+
+enum arpc_result {
+ ARPC_SUCCESS = 0x00,
+ ARPC_NO_MEMORY = 0x01,
+ ARPC_INVALID = 0x02,
+ ARPC_TIMEOUT = 0x03,
+ ARPC_UNKNOWN_ERROR = 0xff,
+};
+
+struct arpc_request_message {
+ __le16 id; /* RPC unique id */
+ __le16 size; /* Size in bytes of header + payload */
+ __u8 type; /* RPC type */
+ __u8 data[0]; /* ARPC data */
+} __packed;
+
+struct arpc_response_message {
+ __le16 id; /* RPC unique id */
+ __u8 result; /* Result of RPC */
+} __packed;
+
+
+/* ARPC requests */
+#define ARPC_TYPE_CPORT_CONNECTED 0x01
+#define ARPC_TYPE_CPORT_QUIESCE 0x02
+#define ARPC_TYPE_CPORT_CLEAR 0x03
+#define ARPC_TYPE_CPORT_FLUSH 0x04
+#define ARPC_TYPE_CPORT_SHUTDOWN 0x05
+
+struct arpc_cport_connected_req {
+ __le16 cport_id;
+} __packed;
+
+struct arpc_cport_quiesce_req {
+ __le16 cport_id;
+ __le16 peer_space;
+ __le16 timeout;
+} __packed;
+
+struct arpc_cport_clear_req {
+ __le16 cport_id;
+} __packed;
+
+struct arpc_cport_flush_req {
+ __le16 cport_id;
+} __packed;
+
+struct arpc_cport_shutdown_req {
+ __le16 cport_id;
+ __le16 timeout;
+ __u8 phase;
+} __packed;
+
+#endif /* __ARPC_H */
--- /dev/null
+++ b/drivers/greybus/authentication.c
@@ -0,0 +1,429 @@
+/*
+ * Greybus Component Authentication Protocol (CAP) Driver.
+ *
+ * Copyright 2016 Google Inc.
+ * Copyright 2016 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#include "greybus.h"
+
+#include <linux/cdev.h>
+#include <linux/fs.h>
+#include <linux/ioctl.h>
+#include <linux/uaccess.h>
+
+#include "greybus_authentication.h"
+#include "firmware.h"
+#include "greybus.h"
+
+#define CAP_TIMEOUT_MS 1000
+
+/*
+ * Number of minor devices this driver supports.
+ * There will be exactly one required per Interface.
+ */
+#define NUM_MINORS U8_MAX
+
+struct gb_cap {
+ struct device *parent;
+ struct gb_connection *connection;
+ struct kref kref;
+ struct list_head node;
+ bool disabled; /* connection getting disabled */
+
+ struct mutex mutex;
+ struct cdev cdev;
+ struct device *class_device;
+ dev_t dev_num;
+};
+
+static struct class *cap_class;
+static dev_t cap_dev_num;
+static DEFINE_IDA(cap_minors_map);
+static LIST_HEAD(cap_list);
+static DEFINE_MUTEX(list_mutex);
+
+static void cap_kref_release(struct kref *kref)
+{
+ struct gb_cap *cap = container_of(kref, struct gb_cap, kref);
+
+ kfree(cap);
+}
+
+/*
+ * All users of cap take a reference (from within list_mutex lock), before
+ * they get a pointer to play with. And the structure will be freed only after
+ * the last user has put the reference to it.
+ */
+static void put_cap(struct gb_cap *cap)
+{
+ kref_put(&cap->kref, cap_kref_release);
+}
+
+/* Caller must call put_cap() after using struct gb_cap */
+static struct gb_cap *get_cap(struct cdev *cdev)
+{
+ struct gb_cap *cap;
+
+ mutex_lock(&list_mutex);
+
+ list_for_each_entry(cap, &cap_list, node) {
+ if (&cap->cdev == cdev) {
+ kref_get(&cap->kref);
+ goto unlock;
+ }
+ }
+
+ cap = NULL;
+
+unlock:
+ mutex_unlock(&list_mutex);
+
+ return cap;
+}
+
+static int cap_get_endpoint_uid(struct gb_cap *cap, u8 *euid)
+{
+ struct gb_connection *connection = cap->connection;
+ struct gb_cap_get_endpoint_uid_response response;
+ int ret;
+
+ ret = gb_operation_sync(connection, GB_CAP_TYPE_GET_ENDPOINT_UID, NULL,
+ 0, &response, sizeof(response));
+ if (ret) {
+ dev_err(cap->parent, "failed to get endpoint uid (%d)\n", ret);
+ return ret;
+ }
+
+ memcpy(euid, response.uid, sizeof(response.uid));
+
+ return 0;
+}
+
+static int cap_get_ims_certificate(struct gb_cap *cap, u32 class, u32 id,
+ u8 *certificate, u32 *size, u8 *result)
+{
+ struct gb_connection *connection = cap->connection;
+ struct gb_cap_get_ims_certificate_request *request;
+ struct gb_cap_get_ims_certificate_response *response;
+ size_t max_size = gb_operation_get_payload_size_max(connection);
+ struct gb_operation *op;
+ int ret;
+
+ op = gb_operation_create_flags(connection,
+ GB_CAP_TYPE_GET_IMS_CERTIFICATE,
+ sizeof(*request), max_size,
+ GB_OPERATION_FLAG_SHORT_RESPONSE,
+ GFP_KERNEL);
+ if (!op)
+ return -ENOMEM;
+
+ request = op->request->payload;
+ request->certificate_class = cpu_to_le32(class);
+ request->certificate_id = cpu_to_le32(id);
+
+ ret = gb_operation_request_send_sync(op);
+ if (ret) {
+ dev_err(cap->parent, "failed to get certificate (%d)\n", ret);
+ goto done;
+ }
+
+ response = op->response->payload;
+ *result = response->result_code;
+ *size = op->response->payload_size - sizeof(*response);
+ memcpy(certificate, response->certificate, *size);
+
+done:
+ gb_operation_put(op);
+ return ret;
+}
+
+static int cap_authenticate(struct gb_cap *cap, u32 auth_type, u8 *uid,
+ u8 *challenge, u8 *result, u8 *auth_response,
+ u32 *signature_size, u8 *signature)
+{
+ struct gb_connection *connection = cap->connection;
+ struct gb_cap_authenticate_request *request;
+ struct gb_cap_authenticate_response *response;
+ size_t max_size = gb_operation_get_payload_size_max(connection);
+ struct gb_operation *op;
+ int ret;
+
+ op = gb_operation_create_flags(connection, GB_CAP_TYPE_AUTHENTICATE,
+ sizeof(*request), max_size,
+ GB_OPERATION_FLAG_SHORT_RESPONSE,
+ GFP_KERNEL);
+ if (!op)
+ return -ENOMEM;
+
+ request = op->request->payload;
+ request->auth_type = cpu_to_le32(auth_type);
+ memcpy(request->uid, uid, sizeof(request->uid));
+ memcpy(request->challenge, challenge, sizeof(request->challenge));
+
+ ret = gb_operation_request_send_sync(op);
+ if (ret) {
+ dev_err(cap->parent, "failed to authenticate (%d)\n", ret);
+ goto done;
+ }
+
+ response = op->response->payload;
+ *result = response->result_code;
+ *signature_size = op->response->payload_size - sizeof(*response);
+ memcpy(auth_response, response->response, sizeof(response->response));
+ memcpy(signature, response->signature, *signature_size);
+
+done:
+ gb_operation_put(op);
+ return ret;
+}
+
+/* Char device fops */
+
+static int cap_open(struct inode *inode, struct file *file)
+{
+ struct gb_cap *cap = get_cap(inode->i_cdev);
+
+ /* cap structure can't get freed until file descriptor is closed */
+ if (cap) {
+ file->private_data = cap;
+ return 0;
+ }
+
+ return -ENODEV;
+}
+
+static int cap_release(struct inode *inode, struct file *file)
+{
+ struct gb_cap *cap = file->private_data;
+
+ put_cap(cap);
+ return 0;
+}
+
+static int cap_ioctl(struct gb_cap *cap, unsigned int cmd,
+ void __user *buf)
+{
+ struct cap_ioc_get_endpoint_uid endpoint_uid;
+ struct cap_ioc_get_ims_certificate *ims_cert;
+ struct cap_ioc_authenticate *authenticate;
+ size_t size;
+ int ret;
+
+ switch (cmd) {
+ case CAP_IOC_GET_ENDPOINT_UID:
+ ret = cap_get_endpoint_uid(cap, endpoint_uid.uid);
+ if (ret)
+ return ret;
+
+ if (copy_to_user(buf, &endpoint_uid, sizeof(endpoint_uid)))
+ return -EFAULT;
+
+ return 0;
+ case CAP_IOC_GET_IMS_CERTIFICATE:
+ size = sizeof(*ims_cert);
+ ims_cert = memdup_user(buf, size);
+ if (IS_ERR(ims_cert))
+ return PTR_ERR(ims_cert);
+
+ ret = cap_get_ims_certificate(cap, ims_cert->certificate_class,
+ ims_cert->certificate_id,
+ ims_cert->certificate,
+ &ims_cert->cert_size,
+ &ims_cert->result_code);
+ if (!ret && copy_to_user(buf, ims_cert, size))
+ ret = -EFAULT;
+ kfree(ims_cert);
+
+ return ret;
+ case CAP_IOC_AUTHENTICATE:
+ size = sizeof(*authenticate);
+ authenticate = memdup_user(buf, size);
+ if (IS_ERR(authenticate))
+ return PTR_ERR(authenticate);
+
+ ret = cap_authenticate(cap, authenticate->auth_type,
+ authenticate->uid,
+ authenticate->challenge,
+ &authenticate->result_code,
+ authenticate->response,
+ &authenticate->signature_size,
+ authenticate->signature);
+ if (!ret && copy_to_user(buf, authenticate, size))
+ ret = -EFAULT;
+ kfree(authenticate);
+
+ return ret;
+ default:
+ return -ENOTTY;
+ }
+}
+
+static long cap_ioctl_unlocked(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ struct gb_cap *cap = file->private_data;
+ struct gb_bundle *bundle = cap->connection->bundle;
+ int ret = -ENODEV;
+
+ /*
+ * Serialize ioctls.
+ *
+ * We don't want the user to do multiple authentication operations in
+ * parallel.
+ *
+ * This is also used to protect ->disabled, which is used to check if
+ * the connection is getting disconnected, so that we don't start any
+ * new operations.
+ */
+ mutex_lock(&cap->mutex);
+ if (!cap->disabled) {
+ ret = gb_pm_runtime_get_sync(bundle);
+ if (!ret) {
+ ret = cap_ioctl(cap, cmd, (void __user *)arg);
+ gb_pm_runtime_put_autosuspend(bundle);
+ }
+ }
+ mutex_unlock(&cap->mutex);
+
+ return ret;
+}
+
+static const struct file_operations cap_fops = {
+ .owner = THIS_MODULE,
+ .open = cap_open,
+ .release = cap_release,
+ .unlocked_ioctl = cap_ioctl_unlocked,
+};
+
+int gb_cap_connection_init(struct gb_connection *connection)
+{
+ struct gb_cap *cap;
+ int ret, minor;
+
+ if (!connection)
+ return 0;
+
+ cap = kzalloc(sizeof(*cap), GFP_KERNEL);
+ if (!cap)
+ return -ENOMEM;
+
+ cap->parent = &connection->bundle->dev;
+ cap->connection = connection;
+ mutex_init(&cap->mutex);
+ gb_connection_set_data(connection, cap);
+ kref_init(&cap->kref);
+
+ mutex_lock(&list_mutex);
+ list_add(&cap->node, &cap_list);
+ mutex_unlock(&list_mutex);
+
+ ret = gb_connection_enable(connection);
+ if (ret)
+ goto err_list_del;
+
+ minor = ida_simple_get(&cap_minors_map, 0, NUM_MINORS, GFP_KERNEL);
+ if (minor < 0) {
+ ret = minor;
+ goto err_connection_disable;
+ }
+
+ /* Add a char device to allow userspace to interact with cap */
+ cap->dev_num = MKDEV(MAJOR(cap_dev_num), minor);
+ cdev_init(&cap->cdev, &cap_fops);
+
+ ret = cdev_add(&cap->cdev, cap->dev_num, 1);
+ if (ret)
+ goto err_remove_ida;
+
+ /* Add a soft link to the previously added char-dev within the bundle */
+ cap->class_device = device_create(cap_class, cap->parent, cap->dev_num,
+ NULL, "gb-authenticate-%d", minor);
+ if (IS_ERR(cap->class_device)) {
+ ret = PTR_ERR(cap->class_device);
+ goto err_del_cdev;
+ }
+
+ return 0;
+
+err_del_cdev:
+ cdev_del(&cap->cdev);
+err_remove_ida:
+ ida_simple_remove(&cap_minors_map, minor);
+err_connection_disable:
+ gb_connection_disable(connection);
+err_list_del:
+ mutex_lock(&list_mutex);
+ list_del(&cap->node);
+ mutex_unlock(&list_mutex);
+
+ put_cap(cap);
+
+ return ret;
+}
+
+void gb_cap_connection_exit(struct gb_connection *connection)
+{
+ struct gb_cap *cap;
+
+ if (!connection)
+ return;
+
+ cap = gb_connection_get_data(connection);
+
+ device_destroy(cap_class, cap->dev_num);
+ cdev_del(&cap->cdev);
+ ida_simple_remove(&cap_minors_map, MINOR(cap->dev_num));
+
+ /*
+ * Disallow any new ioctl operations on the char device and wait for
+ * existing ones to finish.
+ */
+ mutex_lock(&cap->mutex);
+ cap->disabled = true;
+ mutex_unlock(&cap->mutex);
+
+ /* All pending greybus operations should have finished by now */
+ gb_connection_disable(cap->connection);
+
+ /* Disallow new users to get access to the cap structure */
+ mutex_lock(&list_mutex);
+ list_del(&cap->node);
+ mutex_unlock(&list_mutex);
+
+ /*
+ * All current users of cap would have taken a reference to it by
+ * now, we can drop our reference and wait the last user will get
+ * cap freed.
+ */
+ put_cap(cap);
+}
+
+int cap_init(void)
+{
+ int ret;
+
+ cap_class = class_create(THIS_MODULE, "gb_authenticate");
+ if (IS_ERR(cap_class))
+ return PTR_ERR(cap_class);
+
+ ret = alloc_chrdev_region(&cap_dev_num, 0, NUM_MINORS,
+ "gb_authenticate");
+ if (ret)
+ goto err_remove_class;
+
+ return 0;
+
+err_remove_class:
+ class_destroy(cap_class);
+ return ret;
+}
+
+void cap_exit(void)
+{
+ unregister_chrdev_region(cap_dev_num, NUM_MINORS);
+ class_destroy(cap_class);
+ ida_destroy(&cap_minors_map);
+}
--- /dev/null
+++ b/drivers/greybus/bundle.c
@@ -0,0 +1,253 @@
+/*
+ * Greybus bundles
+ *
+ * Copyright 2014-2015 Google Inc.
+ * Copyright 2014-2015 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#include "greybus.h"
+#include "greybus_trace.h"
+
+static ssize_t bundle_class_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct gb_bundle *bundle = to_gb_bundle(dev);
+
+ return sprintf(buf, "0x%02x\n", bundle->class);
+}
+static DEVICE_ATTR_RO(bundle_class);
+
+static ssize_t bundle_id_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct gb_bundle *bundle = to_gb_bundle(dev);
+
+ return sprintf(buf, "%u\n", bundle->id);
+}
+static DEVICE_ATTR_RO(bundle_id);
+
+static ssize_t state_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct gb_bundle *bundle = to_gb_bundle(dev);
+
+ if (bundle->state == NULL)
+ return sprintf(buf, "\n");
+
+ return sprintf(buf, "%s\n", bundle->state);
+}
+
+static ssize_t state_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ struct gb_bundle *bundle = to_gb_bundle(dev);
+
+ kfree(bundle->state);
+ bundle->state = kstrdup(buf, GFP_KERNEL);
+ if (!bundle->state)
+ return -ENOMEM;
+
+ /* Tell userspace that the file contents changed */
+ sysfs_notify(&bundle->dev.kobj, NULL, "state");
+
+ return size;
+}
+static DEVICE_ATTR_RW(state);
+
+static struct attribute *bundle_attrs[] = {
+ &dev_attr_bundle_class.attr,
+ &dev_attr_bundle_id.attr,
+ &dev_attr_state.attr,
+ NULL,
+};
+
+ATTRIBUTE_GROUPS(bundle);
+
+static struct gb_bundle *gb_bundle_find(struct gb_interface *intf,
+ u8 bundle_id)
+{
+ struct gb_bundle *bundle;
+
+ list_for_each_entry(bundle, &intf->bundles, links) {
+ if (bundle->id == bundle_id)
+ return bundle;
+ }
+
+ return NULL;
+}
+
+static void gb_bundle_release(struct device *dev)
+{
+ struct gb_bundle *bundle = to_gb_bundle(dev);
+
+ trace_gb_bundle_release(bundle);
+
+ kfree(bundle->state);
+ kfree(bundle->cport_desc);
+ kfree(bundle);
+}
+
+#ifdef CONFIG_PM
+static void gb_bundle_disable_all_connections(struct gb_bundle *bundle)
+{
+ struct gb_connection *connection;
+
+ list_for_each_entry(connection, &bundle->connections, bundle_links)
+ gb_connection_disable(connection);
+}
+
+static void gb_bundle_enable_all_connections(struct gb_bundle *bundle)
+{
+ struct gb_connection *connection;
+
+ list_for_each_entry(connection, &bundle->connections, bundle_links)
+ gb_connection_enable(connection);
+}
+
+static int gb_bundle_suspend(struct device *dev)
+{
+ struct gb_bundle *bundle = to_gb_bundle(dev);
+ const struct dev_pm_ops *pm = dev->driver->pm;
+ int ret;
+
+ if (pm && pm->runtime_suspend) {
+ ret = pm->runtime_suspend(&bundle->dev);
+ if (ret)
+ return ret;
+ } else {
+ gb_bundle_disable_all_connections(bundle);
+ }
+
+ ret = gb_control_bundle_suspend(bundle->intf->control, bundle->id);
+ if (ret) {
+ if (pm && pm->runtime_resume)
+ ret = pm->runtime_resume(dev);
+ else
+ gb_bundle_enable_all_connections(bundle);
+
+ return ret;
+ }
+
+ return 0;
+}
+
+static int gb_bundle_resume(struct device *dev)
+{
+ struct gb_bundle *bundle = to_gb_bundle(dev);
+ const struct dev_pm_ops *pm = dev->driver->pm;
+ int ret;
+
+ ret = gb_control_bundle_resume(bundle->intf->control, bundle->id);
+ if (ret)
+ return ret;
+
+ if (pm && pm->runtime_resume) {
+ ret = pm->runtime_resume(dev);
+ if (ret)
+ return ret;
+ } else {
+ gb_bundle_enable_all_connections(bundle);
+ }
+
+ return 0;
+}
+
+static int gb_bundle_idle(struct device *dev)
+{
+ pm_runtime_mark_last_busy(dev);
+ pm_request_autosuspend(dev);
+
+ return 0;
+}
+#endif
+
+static const struct dev_pm_ops gb_bundle_pm_ops = {
+ SET_RUNTIME_PM_OPS(gb_bundle_suspend, gb_bundle_resume, gb_bundle_idle)
+};
+
+struct device_type greybus_bundle_type = {
+ .name = "greybus_bundle",
+ .release = gb_bundle_release,
+ .pm = &gb_bundle_pm_ops,
+};
+
+/*
+ * Create a gb_bundle structure to represent a discovered
+ * bundle. Returns a pointer to the new bundle or a null
+ * pointer if a failure occurs due to memory exhaustion.
+ */
+struct gb_bundle *gb_bundle_create(struct gb_interface *intf, u8 bundle_id,
+ u8 class)
+{
+ struct gb_bundle *bundle;
+
+ if (bundle_id == BUNDLE_ID_NONE) {
+ dev_err(&intf->dev, "can't use bundle id %u\n", bundle_id);
+ return NULL;
+ }
+
+ /*
+ * Reject any attempt to reuse a bundle id. We initialize
+ * these serially, so there's no need to worry about keeping
+ * the interface bundle list locked here.
+ */
+ if (gb_bundle_find(intf, bundle_id)) {
+ dev_err(&intf->dev, "duplicate bundle id %u\n", bundle_id);
+ return NULL;
+ }
+
+ bundle = kzalloc(sizeof(*bundle), GFP_KERNEL);
+ if (!bundle)
+ return NULL;
+
+ bundle->intf = intf;
+ bundle->id = bundle_id;
+ bundle->class = class;
+ INIT_LIST_HEAD(&bundle->connections);
+
+ bundle->dev.parent = &intf->dev;
+ bundle->dev.bus = &greybus_bus_type;
+ bundle->dev.type = &greybus_bundle_type;
+ bundle->dev.groups = bundle_groups;
+ bundle->dev.dma_mask = intf->dev.dma_mask;
+ device_initialize(&bundle->dev);
+ dev_set_name(&bundle->dev, "%s.%d", dev_name(&intf->dev), bundle_id);
+
+ list_add(&bundle->links, &intf->bundles);
+
+ trace_gb_bundle_create(bundle);
+
+ return bundle;
+}
+
+int gb_bundle_add(struct gb_bundle *bundle)
+{
+ int ret;
+
+ ret = device_add(&bundle->dev);
+ if (ret) {
+ dev_err(&bundle->dev, "failed to register bundle: %d\n", ret);
+ return ret;
+ }
+
+ trace_gb_bundle_add(bundle);
+
+ return 0;
+}
+
+/*
+ * Tear down a previously set up bundle.
+ */
+void gb_bundle_destroy(struct gb_bundle *bundle)
+{
+ trace_gb_bundle_destroy(bundle);
+
+ if (device_is_registered(&bundle->dev))
+ device_del(&bundle->dev);
+
+ list_del(&bundle->links);
+
+ put_device(&bundle->dev);
+}
--- /dev/null
+++ b/drivers/greybus/bundle.h
@@ -0,0 +1,90 @@
+/*
+ * Greybus bundles
+ *
+ * Copyright 2014 Google Inc.
+ * Copyright 2014 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#ifndef __BUNDLE_H
+#define __BUNDLE_H
+
+#include <linux/list.h>
+
+#define BUNDLE_ID_NONE U8_MAX
+
+/* Greybus "public" definitions" */
+struct gb_bundle {
+ struct device dev;
+ struct gb_interface *intf;
+
+ u8 id;
+ u8 class;
+ u8 class_major;
+ u8 class_minor;
+
+ size_t num_cports;
+ struct greybus_descriptor_cport *cport_desc;
+
+ struct list_head connections;
+ u8 *state;
+
+ struct list_head links; /* interface->bundles */
+};
+#define to_gb_bundle(d) container_of(d, struct gb_bundle, dev)
+
+/* Greybus "private" definitions" */
+struct gb_bundle *gb_bundle_create(struct gb_interface *intf, u8 bundle_id,
+ u8 class);
+int gb_bundle_add(struct gb_bundle *bundle);
+void gb_bundle_destroy(struct gb_bundle *bundle);
+
+/* Bundle Runtime PM wrappers */
+#ifdef CONFIG_PM
+static inline int gb_pm_runtime_get_sync(struct gb_bundle *bundle)
+{
+ int retval;
+
+ retval = pm_runtime_get_sync(&bundle->dev);
+ if (retval < 0) {
+ dev_err(&bundle->dev,
+ "pm_runtime_get_sync failed: %d\n", retval);
+ pm_runtime_put_noidle(&bundle->dev);
+ return retval;
+ }
+
+ return 0;
+}
+
+static inline int gb_pm_runtime_put_autosuspend(struct gb_bundle *bundle)
+{
+ int retval;
+
+ pm_runtime_mark_last_busy(&bundle->dev);
+ retval = pm_runtime_put_autosuspend(&bundle->dev);
+
+ return retval;
+}
+
+static inline void gb_pm_runtime_get_noresume(struct gb_bundle *bundle)
+{
+ pm_runtime_get_noresume(&bundle->dev);
+}
+
+static inline void gb_pm_runtime_put_noidle(struct gb_bundle *bundle)
+{
+ pm_runtime_put_noidle(&bundle->dev);
+}
+
+#else
+static inline int gb_pm_runtime_get_sync(struct gb_bundle *bundle)
+{ return 0; }
+static inline int gb_pm_runtime_put_autosuspend(struct gb_bundle *bundle)
+{ return 0; }
+
+static inline void gb_pm_runtime_get_noresume(struct gb_bundle *bundle) {}
+static inline void gb_pm_runtime_put_noidle(struct gb_bundle *bundle) {}
+#endif
+
+#endif /* __BUNDLE_H */
--- /dev/null
+++ b/drivers/greybus/connection.c
@@ -0,0 +1,938 @@
+/*
+ * Greybus connections
+ *
+ * Copyright 2014 Google Inc.
+ * Copyright 2014 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#include <linux/workqueue.h>
+
+#include "greybus.h"
+#include "greybus_trace.h"
+
+
+#define GB_CONNECTION_CPORT_QUIESCE_TIMEOUT 1000
+
+
+static void gb_connection_kref_release(struct kref *kref);
+
+
+static DEFINE_SPINLOCK(gb_connections_lock);
+static DEFINE_MUTEX(gb_connection_mutex);
+
+
+/* Caller holds gb_connection_mutex. */
+static bool gb_connection_cport_in_use(struct gb_interface *intf, u16 cport_id)
+{
+ struct gb_host_device *hd = intf->hd;
+ struct gb_connection *connection;
+
+ list_for_each_entry(connection, &hd->connections, hd_links) {
+ if (connection->intf == intf &&
+ connection->intf_cport_id == cport_id)
+ return true;
+ }
+
+ return false;
+}
+
+static void gb_connection_get(struct gb_connection *connection)
+{
+ kref_get(&connection->kref);
+
+ trace_gb_connection_get(connection);
+}
+
+static void gb_connection_put(struct gb_connection *connection)
+{
+ trace_gb_connection_put(connection);
+
+ kref_put(&connection->kref, gb_connection_kref_release);
+}
+
+/*
+ * Returns a reference-counted pointer to the connection if found.
+ */
+static struct gb_connection *
+gb_connection_hd_find(struct gb_host_device *hd, u16 cport_id)
+{
+ struct gb_connection *connection;
+ unsigned long flags;
+
+ spin_lock_irqsave(&gb_connections_lock, flags);
+ list_for_each_entry(connection, &hd->connections, hd_links)
+ if (connection->hd_cport_id == cport_id) {
+ gb_connection_get(connection);
+ goto found;
+ }
+ connection = NULL;
+found:
+ spin_unlock_irqrestore(&gb_connections_lock, flags);
+
+ return connection;
+}
+
+/*
+ * Callback from the host driver to let us know that data has been
+ * received on the bundle.
+ */
+void greybus_data_rcvd(struct gb_host_device *hd, u16 cport_id,
+ u8 *data, size_t length)
+{
+ struct gb_connection *connection;
+
+ trace_gb_hd_in(hd);
+
+ connection = gb_connection_hd_find(hd, cport_id);
+ if (!connection) {
+ dev_err(&hd->dev,
+ "nonexistent connection (%zu bytes dropped)\n", length);
+ return;
+ }
+ gb_connection_recv(connection, data, length);
+ gb_connection_put(connection);
+}
+EXPORT_SYMBOL_GPL(greybus_data_rcvd);
+
+static void gb_connection_kref_release(struct kref *kref)
+{
+ struct gb_connection *connection;
+
+ connection = container_of(kref, struct gb_connection, kref);
+
+ trace_gb_connection_release(connection);
+
+ kfree(connection);
+}
+
+static void gb_connection_init_name(struct gb_connection *connection)
+{
+ u16 hd_cport_id = connection->hd_cport_id;
+ u16 cport_id = 0;
+ u8 intf_id = 0;
+
+ if (connection->intf) {
+ intf_id = connection->intf->interface_id;
+ cport_id = connection->intf_cport_id;
+ }
+
+ snprintf(connection->name, sizeof(connection->name),
+ "%u/%u:%u", hd_cport_id, intf_id, cport_id);
+}
+
+/*
+ * _gb_connection_create() - create a Greybus connection
+ * @hd: host device of the connection
+ * @hd_cport_id: host-device cport id, or -1 for dynamic allocation
+ * @intf: remote interface, or NULL for static connections
+ * @bundle: remote-interface bundle (may be NULL)
+ * @cport_id: remote-interface cport id, or 0 for static connections
+ * @handler: request handler (may be NULL)
+ * @flags: connection flags
+ *
+ * Create a Greybus connection, representing the bidirectional link
+ * between a CPort on a (local) Greybus host device and a CPort on
+ * another Greybus interface.
+ *
+ * A connection also maintains the state of operations sent over the
+ * connection.
+ *
+ * Serialised against concurrent create and destroy using the
+ * gb_connection_mutex.
+ *
+ * Return: A pointer to the new connection if successful, or an ERR_PTR
+ * otherwise.
+ */
+static struct gb_connection *
+_gb_connection_create(struct gb_host_device *hd, int hd_cport_id,
+ struct gb_interface *intf,
+ struct gb_bundle *bundle, int cport_id,
+ gb_request_handler_t handler,
+ unsigned long flags)
+{
+ struct gb_connection *connection;
+ int ret;
+
+ mutex_lock(&gb_connection_mutex);
+
+ if (intf && gb_connection_cport_in_use(intf, cport_id)) {
+ dev_err(&intf->dev, "cport %u already in use\n", cport_id);
+ ret = -EBUSY;
+ goto err_unlock;
+ }
+
+ ret = gb_hd_cport_allocate(hd, hd_cport_id, flags);
+ if (ret < 0) {
+ dev_err(&hd->dev, "failed to allocate cport: %d\n", ret);
+ goto err_unlock;
+ }
+ hd_cport_id = ret;
+
+ connection = kzalloc(sizeof(*connection), GFP_KERNEL);
+ if (!connection) {
+ ret = -ENOMEM;
+ goto err_hd_cport_release;
+ }
+
+ connection->hd_cport_id = hd_cport_id;
+ connection->intf_cport_id = cport_id;
+ connection->hd = hd;
+ connection->intf = intf;
+ connection->bundle = bundle;
+ connection->handler = handler;
+ connection->flags = flags;
+ if (intf && (intf->quirks & GB_INTERFACE_QUIRK_NO_CPORT_FEATURES))
+ connection->flags |= GB_CONNECTION_FLAG_NO_FLOWCTRL;
+ connection->state = GB_CONNECTION_STATE_DISABLED;
+
+ atomic_set(&connection->op_cycle, 0);
+ mutex_init(&connection->mutex);
+ spin_lock_init(&connection->lock);
+ INIT_LIST_HEAD(&connection->operations);
+
+ connection->wq = alloc_workqueue("%s:%d", WQ_UNBOUND, 1,
+ dev_name(&hd->dev), hd_cport_id);
+ if (!connection->wq) {
+ ret = -ENOMEM;
+ goto err_free_connection;
+ }
+
+ kref_init(&connection->kref);
+
+ gb_connection_init_name(connection);
+
+ spin_lock_irq(&gb_connections_lock);
+ list_add(&connection->hd_links, &hd->connections);
+
+ if (bundle)
+ list_add(&connection->bundle_links, &bundle->connections);
+ else
+ INIT_LIST_HEAD(&connection->bundle_links);
+
+ spin_unlock_irq(&gb_connections_lock);
+
+ mutex_unlock(&gb_connection_mutex);
+
+ trace_gb_connection_create(connection);
+
+ return connection;
+
+err_free_connection:
+ kfree(connection);
+err_hd_cport_release:
+ gb_hd_cport_release(hd, hd_cport_id);
+err_unlock:
+ mutex_unlock(&gb_connection_mutex);
+
+ return ERR_PTR(ret);
+}
+
+struct gb_connection *
+gb_connection_create_static(struct gb_host_device *hd, u16 hd_cport_id,
+ gb_request_handler_t handler)
+{
+ return _gb_connection_create(hd, hd_cport_id, NULL, NULL, 0, handler,
+ GB_CONNECTION_FLAG_HIGH_PRIO);
+}
+
+struct gb_connection *
+gb_connection_create_control(struct gb_interface *intf)
+{
+ return _gb_connection_create(intf->hd, -1, intf, NULL, 0, NULL,
+ GB_CONNECTION_FLAG_CONTROL |
+ GB_CONNECTION_FLAG_HIGH_PRIO);
+}
+
+struct gb_connection *
+gb_connection_create(struct gb_bundle *bundle, u16 cport_id,
+ gb_request_handler_t handler)
+{
+ struct gb_interface *intf = bundle->intf;
+
+ return _gb_connection_create(intf->hd, -1, intf, bundle, cport_id,
+ handler, 0);
+}
+EXPORT_SYMBOL_GPL(gb_connection_create);
+
+struct gb_connection *
+gb_connection_create_flags(struct gb_bundle *bundle, u16 cport_id,
+ gb_request_handler_t handler,
+ unsigned long flags)
+{
+ struct gb_interface *intf = bundle->intf;
+
+ if (WARN_ON_ONCE(flags & GB_CONNECTION_FLAG_CORE_MASK))
+ flags &= ~GB_CONNECTION_FLAG_CORE_MASK;
+
+ return _gb_connection_create(intf->hd, -1, intf, bundle, cport_id,
+ handler, flags);
+}
+EXPORT_SYMBOL_GPL(gb_connection_create_flags);
+
+struct gb_connection *
+gb_connection_create_offloaded(struct gb_bundle *bundle, u16 cport_id,
+ unsigned long flags)
+{
+ flags |= GB_CONNECTION_FLAG_OFFLOADED;
+
+ return gb_connection_create_flags(bundle, cport_id, NULL, flags);
+}
+EXPORT_SYMBOL_GPL(gb_connection_create_offloaded);
+
+static int gb_connection_hd_cport_enable(struct gb_connection *connection)
+{
+ struct gb_host_device *hd = connection->hd;
+ int ret;
+
+ if (!hd->driver->cport_enable)
+ return 0;
+
+ ret = hd->driver->cport_enable(hd, connection->hd_cport_id,
+ connection->flags);
+ if (ret) {
+ dev_err(&hd->dev, "%s: failed to enable host cport: %d\n",
+ connection->name, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void gb_connection_hd_cport_disable(struct gb_connection *connection)
+{
+ struct gb_host_device *hd = connection->hd;
+ int ret;
+
+ if (!hd->driver->cport_disable)
+ return;
+
+ ret = hd->driver->cport_disable(hd, connection->hd_cport_id);
+ if (ret) {
+ dev_err(&hd->dev, "%s: failed to disable host cport: %d\n",
+ connection->name, ret);
+ }
+}
+
+static int gb_connection_hd_cport_connected(struct gb_connection *connection)
+{
+ struct gb_host_device *hd = connection->hd;
+ int ret;
+
+ if (!hd->driver->cport_connected)
+ return 0;
+
+ ret = hd->driver->cport_connected(hd, connection->hd_cport_id);
+ if (ret) {
+ dev_err(&hd->dev, "%s: failed to set connected state: %d\n",
+ connection->name, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int gb_connection_hd_cport_flush(struct gb_connection *connection)
+{
+ struct gb_host_device *hd = connection->hd;
+ int ret;
+
+ if (!hd->driver->cport_flush)
+ return 0;
+
+ ret = hd->driver->cport_flush(hd, connection->hd_cport_id);
+ if (ret) {
+ dev_err(&hd->dev, "%s: failed to flush host cport: %d\n",
+ connection->name, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int gb_connection_hd_cport_quiesce(struct gb_connection *connection)
+{
+ struct gb_host_device *hd = connection->hd;
+ size_t peer_space;
+ int ret;
+
+ peer_space = sizeof(struct gb_operation_msg_hdr) +
+ sizeof(struct gb_cport_shutdown_request);
+
+ if (connection->mode_switch)
+ peer_space += sizeof(struct gb_operation_msg_hdr);
+
+ ret = hd->driver->cport_quiesce(hd, connection->hd_cport_id,
+ peer_space,
+ GB_CONNECTION_CPORT_QUIESCE_TIMEOUT);
+ if (ret) {
+ dev_err(&hd->dev, "%s: failed to quiesce host cport: %d\n",
+ connection->name, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int gb_connection_hd_cport_clear(struct gb_connection *connection)
+{
+ struct gb_host_device *hd = connection->hd;
+ int ret;
+
+ ret = hd->driver->cport_clear(hd, connection->hd_cport_id);
+ if (ret) {
+ dev_err(&hd->dev, "%s: failed to clear host cport: %d\n",
+ connection->name, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ * Request the SVC to create a connection from AP's cport to interface's
+ * cport.
+ */
+static int
+gb_connection_svc_connection_create(struct gb_connection *connection)
+{
+ struct gb_host_device *hd = connection->hd;
+ struct gb_interface *intf;
+ u8 cport_flags;
+ int ret;
+
+ if (gb_connection_is_static(connection))
+ return 0;
+
+ intf = connection->intf;
+
+ /*
+ * Enable either E2EFC or CSD, unless no flow control is requested.
+ */
+ cport_flags = GB_SVC_CPORT_FLAG_CSV_N;
+ if (gb_connection_flow_control_disabled(connection)) {
+ cport_flags |= GB_SVC_CPORT_FLAG_CSD_N;
+ } else if (gb_connection_e2efc_enabled(connection)) {
+ cport_flags |= GB_SVC_CPORT_FLAG_CSD_N |
+ GB_SVC_CPORT_FLAG_E2EFC;
+ }
+
+ ret = gb_svc_connection_create(hd->svc,
+ hd->svc->ap_intf_id,
+ connection->hd_cport_id,
+ intf->interface_id,
+ connection->intf_cport_id,
+ cport_flags);
+ if (ret) {
+ dev_err(&connection->hd->dev,
+ "%s: failed to create svc connection: %d\n",
+ connection->name, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void
+gb_connection_svc_connection_destroy(struct gb_connection *connection)
+{
+ if (gb_connection_is_static(connection))
+ return;
+
+ gb_svc_connection_destroy(connection->hd->svc,
+ connection->hd->svc->ap_intf_id,
+ connection->hd_cport_id,
+ connection->intf->interface_id,
+ connection->intf_cport_id);
+}
+
+/* Inform Interface about active CPorts */
+static int gb_connection_control_connected(struct gb_connection *connection)
+{
+ struct gb_control *control;
+ u16 cport_id = connection->intf_cport_id;
+ int ret;
+
+ if (gb_connection_is_static(connection))
+ return 0;
+
+ if (gb_connection_is_control(connection))
+ return 0;
+
+ control = connection->intf->control;
+
+ ret = gb_control_connected_operation(control, cport_id);
+ if (ret) {
+ dev_err(&connection->bundle->dev,
+ "failed to connect cport: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void
+gb_connection_control_disconnecting(struct gb_connection *connection)
+{
+ struct gb_control *control;
+ u16 cport_id = connection->intf_cport_id;
+ int ret;
+
+ if (gb_connection_is_static(connection))
+ return;
+
+ control = connection->intf->control;
+
+ ret = gb_control_disconnecting_operation(control, cport_id);
+ if (ret) {
+ dev_err(&connection->hd->dev,
+ "%s: failed to send disconnecting: %d\n",
+ connection->name, ret);
+ }
+}
+
+static void
+gb_connection_control_disconnected(struct gb_connection *connection)
+{
+ struct gb_control *control;
+ u16 cport_id = connection->intf_cport_id;
+ int ret;
+
+ if (gb_connection_is_static(connection))
+ return;
+
+ control = connection->intf->control;
+
+ if (gb_connection_is_control(connection)) {
+ if (connection->mode_switch) {
+ ret = gb_control_mode_switch_operation(control);
+ if (ret) {
+ /*
+ * Allow mode switch to time out waiting for
+ * mailbox event.
+ */
+ return;
+ }
+ }
+
+ return;
+ }
+
+ ret = gb_control_disconnected_operation(control, cport_id);
+ if (ret) {
+ dev_warn(&connection->bundle->dev,
+ "failed to disconnect cport: %d\n", ret);
+ }
+}
+
+static int gb_connection_shutdown_operation(struct gb_connection *connection,
+ u8 phase)
+{
+ struct gb_cport_shutdown_request *req;
+ struct gb_operation *operation;
+ int ret;
+
+ operation = gb_operation_create_core(connection,
+ GB_REQUEST_TYPE_CPORT_SHUTDOWN,
+ sizeof(*req), 0, 0,
+ GFP_KERNEL);
+ if (!operation)
+ return -ENOMEM;
+
+ req = operation->request->payload;
+ req->phase = phase;
+
+ ret = gb_operation_request_send_sync(operation);
+
+ gb_operation_put(operation);
+
+ return ret;
+}
+
+static int gb_connection_cport_shutdown(struct gb_connection *connection,
+ u8 phase)
+{
+ struct gb_host_device *hd = connection->hd;
+ const struct gb_hd_driver *drv = hd->driver;
+ int ret;
+
+ if (gb_connection_is_static(connection))
+ return 0;
+
+ if (gb_connection_is_offloaded(connection)) {
+ if (!drv->cport_shutdown)
+ return 0;
+
+ ret = drv->cport_shutdown(hd, connection->hd_cport_id, phase,
+ GB_OPERATION_TIMEOUT_DEFAULT);
+ } else {
+ ret = gb_connection_shutdown_operation(connection, phase);
+ }
+
+ if (ret) {
+ dev_err(&hd->dev, "%s: failed to send cport shutdown (phase %d): %d\n",
+ connection->name, phase, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int
+gb_connection_cport_shutdown_phase_1(struct gb_connection *connection)
+{
+ return gb_connection_cport_shutdown(connection, 1);
+}
+
+static int
+gb_connection_cport_shutdown_phase_2(struct gb_connection *connection)
+{
+ return gb_connection_cport_shutdown(connection, 2);
+}
+
+/*
+ * Cancel all active operations on a connection.
+ *
+ * Locking: Called with connection lock held and state set to DISABLED or
+ * DISCONNECTING.
+ */
+static void gb_connection_cancel_operations(struct gb_connection *connection,
+ int errno)
+ __must_hold(&connection->lock)
+{
+ struct gb_operation *operation;
+
+ while (!list_empty(&connection->operations)) {
+ operation = list_last_entry(&connection->operations,
+ struct gb_operation, links);
+ gb_operation_get(operation);
+ spin_unlock_irq(&connection->lock);
+
+ if (gb_operation_is_incoming(operation))
+ gb_operation_cancel_incoming(operation, errno);
+ else
+ gb_operation_cancel(operation, errno);
+
+ gb_operation_put(operation);
+
+ spin_lock_irq(&connection->lock);
+ }
+}
+
+/*
+ * Cancel all active incoming operations on a connection.
+ *
+ * Locking: Called with connection lock held and state set to ENABLED_TX.
+ */
+static void
+gb_connection_flush_incoming_operations(struct gb_connection *connection,
+ int errno)
+ __must_hold(&connection->lock)
+{
+ struct gb_operation *operation;
+ bool incoming;
+
+ while (!list_empty(&connection->operations)) {
+ incoming = false;
+ list_for_each_entry(operation, &connection->operations,
+ links) {
+ if (gb_operation_is_incoming(operation)) {
+ gb_operation_get(operation);
+ incoming = true;
+ break;
+ }
+ }
+
+ if (!incoming)
+ break;
+
+ spin_unlock_irq(&connection->lock);
+
+ /* FIXME: flush, not cancel? */
+ gb_operation_cancel_incoming(operation, errno);
+ gb_operation_put(operation);
+
+ spin_lock_irq(&connection->lock);
+ }
+}
+
+/*
+ * _gb_connection_enable() - enable a connection
+ * @connection: connection to enable
+ * @rx: whether to enable incoming requests
+ *
+ * Connection-enable helper for DISABLED->ENABLED, DISABLED->ENABLED_TX, and
+ * ENABLED_TX->ENABLED state transitions.
+ *
+ * Locking: Caller holds connection->mutex.
+ */
+static int _gb_connection_enable(struct gb_connection *connection, bool rx)
+{
+ int ret;
+
+ /* Handle ENABLED_TX -> ENABLED transitions. */
+ if (connection->state == GB_CONNECTION_STATE_ENABLED_TX) {
+ if (!(connection->handler && rx))
+ return 0;
+
+ spin_lock_irq(&connection->lock);
+ connection->state = GB_CONNECTION_STATE_ENABLED;
+ spin_unlock_irq(&connection->lock);
+
+ return 0;
+ }
+
+ ret = gb_connection_hd_cport_enable(connection);
+ if (ret)
+ return ret;
+
+ ret = gb_connection_svc_connection_create(connection);
+ if (ret)
+ goto err_hd_cport_clear;
+
+ ret = gb_connection_hd_cport_connected(connection);
+ if (ret)
+ goto err_svc_connection_destroy;
+
+ spin_lock_irq(&connection->lock);
+ if (connection->handler && rx)
+ connection->state = GB_CONNECTION_STATE_ENABLED;
+ else
+ connection->state = GB_CONNECTION_STATE_ENABLED_TX;
+ spin_unlock_irq(&connection->lock);
+
+ ret = gb_connection_control_connected(connection);
+ if (ret)
+ goto err_control_disconnecting;
+
+ return 0;
+
+err_control_disconnecting:
+ spin_lock_irq(&connection->lock);
+ connection->state = GB_CONNECTION_STATE_DISCONNECTING;
+ gb_connection_cancel_operations(connection, -ESHUTDOWN);
+ spin_unlock_irq(&connection->lock);
+
+ /* Transmit queue should already be empty. */
+ gb_connection_hd_cport_flush(connection);
+
+ gb_connection_control_disconnecting(connection);
+ gb_connection_cport_shutdown_phase_1(connection);
+ gb_connection_hd_cport_quiesce(connection);
+ gb_connection_cport_shutdown_phase_2(connection);
+ gb_connection_control_disconnected(connection);
+ connection->state = GB_CONNECTION_STATE_DISABLED;
+err_svc_connection_destroy:
+ gb_connection_svc_connection_destroy(connection);
+err_hd_cport_clear:
+ gb_connection_hd_cport_clear(connection);
+
+ gb_connection_hd_cport_disable(connection);
+
+ return ret;
+}
+
+int gb_connection_enable(struct gb_connection *connection)
+{
+ int ret = 0;
+
+ mutex_lock(&connection->mutex);
+
+ if (connection->state == GB_CONNECTION_STATE_ENABLED)
+ goto out_unlock;
+
+ ret = _gb_connection_enable(connection, true);
+ if (!ret)
+ trace_gb_connection_enable(connection);
+
+out_unlock:
+ mutex_unlock(&connection->mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(gb_connection_enable);
+
+int gb_connection_enable_tx(struct gb_connection *connection)
+{
+ int ret = 0;
+
+ mutex_lock(&connection->mutex);
+
+ if (connection->state == GB_CONNECTION_STATE_ENABLED) {
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ if (connection->state == GB_CONNECTION_STATE_ENABLED_TX)
+ goto out_unlock;
+
+ ret = _gb_connection_enable(connection, false);
+ if (!ret)
+ trace_gb_connection_enable(connection);
+
+out_unlock:
+ mutex_unlock(&connection->mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(gb_connection_enable_tx);
+
+void gb_connection_disable_rx(struct gb_connection *connection)
+{
+ mutex_lock(&connection->mutex);
+
+ spin_lock_irq(&connection->lock);
+ if (connection->state != GB_CONNECTION_STATE_ENABLED) {
+ spin_unlock_irq(&connection->lock);
+ goto out_unlock;
+ }
+ connection->state = GB_CONNECTION_STATE_ENABLED_TX;
+ gb_connection_flush_incoming_operations(connection, -ESHUTDOWN);
+ spin_unlock_irq(&connection->lock);
+
+ trace_gb_connection_disable(connection);
+
+out_unlock:
+ mutex_unlock(&connection->mutex);
+}
+EXPORT_SYMBOL_GPL(gb_connection_disable_rx);
+
+void gb_connection_mode_switch_prepare(struct gb_connection *connection)
+{
+ connection->mode_switch = true;
+}
+
+void gb_connection_mode_switch_complete(struct gb_connection *connection)
+{
+ gb_connection_svc_connection_destroy(connection);
+ gb_connection_hd_cport_clear(connection);
+
+ gb_connection_hd_cport_disable(connection);
+
+ connection->mode_switch = false;
+}
+
+void gb_connection_disable(struct gb_connection *connection)
+{
+ mutex_lock(&connection->mutex);
+
+ if (connection->state == GB_CONNECTION_STATE_DISABLED)
+ goto out_unlock;
+
+ trace_gb_connection_disable(connection);
+
+ spin_lock_irq(&connection->lock);
+ connection->state = GB_CONNECTION_STATE_DISCONNECTING;
+ gb_connection_cancel_operations(connection, -ESHUTDOWN);
+ spin_unlock_irq(&connection->lock);
+
+ gb_connection_hd_cport_flush(connection);
+
+ gb_connection_control_disconnecting(connection);
+ gb_connection_cport_shutdown_phase_1(connection);
+ gb_connection_hd_cport_quiesce(connection);
+ gb_connection_cport_shutdown_phase_2(connection);
+ gb_connection_control_disconnected(connection);
+
+ connection->state = GB_CONNECTION_STATE_DISABLED;
+
+ /* control-connection tear down is deferred when mode switching */
+ if (!connection->mode_switch) {
+ gb_connection_svc_connection_destroy(connection);
+ gb_connection_hd_cport_clear(connection);
+
+ gb_connection_hd_cport_disable(connection);
+ }
+
+out_unlock:
+ mutex_unlock(&connection->mutex);
+}
+EXPORT_SYMBOL_GPL(gb_connection_disable);
+
+/* Disable a connection without communicating with the remote end. */
+void gb_connection_disable_forced(struct gb_connection *connection)
+{
+ mutex_lock(&connection->mutex);
+
+ if (connection->state == GB_CONNECTION_STATE_DISABLED)
+ goto out_unlock;
+
+ trace_gb_connection_disable(connection);
+
+ spin_lock_irq(&connection->lock);
+ connection->state = GB_CONNECTION_STATE_DISABLED;
+ gb_connection_cancel_operations(connection, -ESHUTDOWN);
+ spin_unlock_irq(&connection->lock);
+
+ gb_connection_hd_cport_flush(connection);
+
+ gb_connection_svc_connection_destroy(connection);
+ gb_connection_hd_cport_clear(connection);
+
+ gb_connection_hd_cport_disable(connection);
+out_unlock:
+ mutex_unlock(&connection->mutex);
+}
+EXPORT_SYMBOL_GPL(gb_connection_disable_forced);
+
+/* Caller must have disabled the connection before destroying it. */
+void gb_connection_destroy(struct gb_connection *connection)
+{
+ if (!connection)
+ return;
+
+ if (WARN_ON(connection->state != GB_CONNECTION_STATE_DISABLED))
+ gb_connection_disable(connection);
+
+ mutex_lock(&gb_connection_mutex);
+
+ spin_lock_irq(&gb_connections_lock);
+ list_del(&connection->bundle_links);
+ list_del(&connection->hd_links);
+ spin_unlock_irq(&gb_connections_lock);
+
+ destroy_workqueue(connection->wq);
+
+ gb_hd_cport_release(connection->hd, connection->hd_cport_id);
+ connection->hd_cport_id = CPORT_ID_BAD;
+
+ mutex_unlock(&gb_connection_mutex);
+
+ gb_connection_put(connection);
+}
+EXPORT_SYMBOL_GPL(gb_connection_destroy);
+
+void gb_connection_latency_tag_enable(struct gb_connection *connection)
+{
+ struct gb_host_device *hd = connection->hd;
+ int ret;
+
+ if (!hd->driver->latency_tag_enable)
+ return;
+
+ ret = hd->driver->latency_tag_enable(hd, connection->hd_cport_id);
+ if (ret) {
+ dev_err(&connection->hd->dev,
+ "%s: failed to enable latency tag: %d\n",
+ connection->name, ret);
+ }
+}
+EXPORT_SYMBOL_GPL(gb_connection_latency_tag_enable);
+
+void gb_connection_latency_tag_disable(struct gb_connection *connection)
+{
+ struct gb_host_device *hd = connection->hd;
+ int ret;
+
+ if (!hd->driver->latency_tag_disable)
+ return;
+
+ ret = hd->driver->latency_tag_disable(hd, connection->hd_cport_id);
+ if (ret) {
+ dev_err(&connection->hd->dev,
+ "%s: failed to disable latency tag: %d\n",
+ connection->name, ret);
+ }
+}
+EXPORT_SYMBOL_GPL(gb_connection_latency_tag_disable);
--- /dev/null
+++ b/drivers/greybus/connection.h
@@ -0,0 +1,129 @@
+/*
+ * Greybus connections
+ *
+ * Copyright 2014 Google Inc.
+ * Copyright 2014 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#ifndef __CONNECTION_H
+#define __CONNECTION_H
+
+#include <linux/list.h>
+#include <linux/kfifo.h>
+
+#define GB_CONNECTION_FLAG_CSD BIT(0)
+#define GB_CONNECTION_FLAG_NO_FLOWCTRL BIT(1)
+#define GB_CONNECTION_FLAG_OFFLOADED BIT(2)
+#define GB_CONNECTION_FLAG_CDSI1 BIT(3)
+#define GB_CONNECTION_FLAG_CONTROL BIT(4)
+#define GB_CONNECTION_FLAG_HIGH_PRIO BIT(5)
+
+#define GB_CONNECTION_FLAG_CORE_MASK GB_CONNECTION_FLAG_CONTROL
+
+enum gb_connection_state {
+ GB_CONNECTION_STATE_DISABLED = 0,
+ GB_CONNECTION_STATE_ENABLED_TX = 1,
+ GB_CONNECTION_STATE_ENABLED = 2,
+ GB_CONNECTION_STATE_DISCONNECTING = 3,
+};
+
+struct gb_operation;
+
+typedef int (*gb_request_handler_t)(struct gb_operation *);
+
+struct gb_connection {
+ struct gb_host_device *hd;
+ struct gb_interface *intf;
+ struct gb_bundle *bundle;
+ struct kref kref;
+ u16 hd_cport_id;
+ u16 intf_cport_id;
+
+ struct list_head hd_links;
+ struct list_head bundle_links;
+
+ gb_request_handler_t handler;
+ unsigned long flags;
+
+ struct mutex mutex;
+ spinlock_t lock;
+ enum gb_connection_state state;
+ struct list_head operations;
+
+ char name[16];
+ struct workqueue_struct *wq;
+
+ atomic_t op_cycle;
+
+ void *private;
+
+ bool mode_switch;
+};
+
+struct gb_connection *gb_connection_create_static(struct gb_host_device *hd,
+ u16 hd_cport_id, gb_request_handler_t handler);
+struct gb_connection *gb_connection_create_control(struct gb_interface *intf);
+struct gb_connection *gb_connection_create(struct gb_bundle *bundle,
+ u16 cport_id, gb_request_handler_t handler);
+struct gb_connection *gb_connection_create_flags(struct gb_bundle *bundle,
+ u16 cport_id, gb_request_handler_t handler,
+ unsigned long flags);
+struct gb_connection *gb_connection_create_offloaded(struct gb_bundle *bundle,
+ u16 cport_id, unsigned long flags);
+void gb_connection_destroy(struct gb_connection *connection);
+
+static inline bool gb_connection_is_static(struct gb_connection *connection)
+{
+ return !connection->intf;
+}
+
+int gb_connection_enable(struct gb_connection *connection);
+int gb_connection_enable_tx(struct gb_connection *connection);
+void gb_connection_disable_rx(struct gb_connection *connection);
+void gb_connection_disable(struct gb_connection *connection);
+void gb_connection_disable_forced(struct gb_connection *connection);
+
+void gb_connection_mode_switch_prepare(struct gb_connection *connection);
+void gb_connection_mode_switch_complete(struct gb_connection *connection);
+
+void greybus_data_rcvd(struct gb_host_device *hd, u16 cport_id,
+ u8 *data, size_t length);
+
+void gb_connection_latency_tag_enable(struct gb_connection *connection);
+void gb_connection_latency_tag_disable(struct gb_connection *connection);
+
+static inline bool gb_connection_e2efc_enabled(struct gb_connection *connection)
+{
+ return !(connection->flags & GB_CONNECTION_FLAG_CSD);
+}
+
+static inline bool
+gb_connection_flow_control_disabled(struct gb_connection *connection)
+{
+ return connection->flags & GB_CONNECTION_FLAG_NO_FLOWCTRL;
+}
+
+static inline bool gb_connection_is_offloaded(struct gb_connection *connection)
+{
+ return connection->flags & GB_CONNECTION_FLAG_OFFLOADED;
+}
+
+static inline bool gb_connection_is_control(struct gb_connection *connection)
+{
+ return connection->flags & GB_CONNECTION_FLAG_CONTROL;
+}
+
+static inline void *gb_connection_get_data(struct gb_connection *connection)
+{
+ return connection->private;
+}
+
+static inline void gb_connection_set_data(struct gb_connection *connection,
+ void *data)
+{
+ connection->private = data;
+}
+
+#endif /* __CONNECTION_H */
--- /dev/null
+++ b/drivers/greybus/control.c
@@ -0,0 +1,635 @@
+/*
+ * Greybus CPort control protocol.
+ *
+ * Copyright 2015 Google Inc.
+ * Copyright 2015 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include "greybus.h"
+
+/* Highest control-protocol version supported */
+#define GB_CONTROL_VERSION_MAJOR 0
+#define GB_CONTROL_VERSION_MINOR 1
+
+
+static int gb_control_get_version(struct gb_control *control)
+{
+ struct gb_interface *intf = control->connection->intf;
+ struct gb_control_version_request request;
+ struct gb_control_version_response response;
+ int ret;
+
+ request.major = GB_CONTROL_VERSION_MAJOR;
+ request.minor = GB_CONTROL_VERSION_MINOR;
+
+ ret = gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_VERSION,
+ &request, sizeof(request), &response,
+ sizeof(response));
+ if (ret) {
+ dev_err(&intf->dev,
+ "failed to get control-protocol version: %d\n",
+ ret);
+ return ret;
+ }
+
+ if (response.major > request.major) {
+ dev_err(&intf->dev,
+ "unsupported major control-protocol version (%u > %u)\n",
+ response.major, request.major);
+ return -ENOTSUPP;
+ }
+
+ control->protocol_major = response.major;
+ control->protocol_minor = response.minor;
+
+ dev_dbg(&intf->dev, "%s - %u.%u\n", __func__, response.major,
+ response.minor);
+
+ return 0;
+}
+
+static int gb_control_get_bundle_version(struct gb_control *control,
+ struct gb_bundle *bundle)
+{
+ struct gb_interface *intf = control->connection->intf;
+ struct gb_control_bundle_version_request request;
+ struct gb_control_bundle_version_response response;
+ int ret;
+
+ request.bundle_id = bundle->id;
+
+ ret = gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_BUNDLE_VERSION,
+ &request, sizeof(request),
+ &response, sizeof(response));
+ if (ret) {
+ dev_err(&intf->dev,
+ "failed to get bundle %u class version: %d\n",
+ bundle->id, ret);
+ return ret;
+ }
+
+ bundle->class_major = response.major;
+ bundle->class_minor = response.minor;
+
+ dev_dbg(&intf->dev, "%s - %u: %u.%u\n", __func__, bundle->id,
+ response.major, response.minor);
+
+ return 0;
+}
+
+int gb_control_get_bundle_versions(struct gb_control *control)
+{
+ struct gb_interface *intf = control->connection->intf;
+ struct gb_bundle *bundle;
+ int ret;
+
+ if (!control->has_bundle_version)
+ return 0;
+
+ list_for_each_entry(bundle, &intf->bundles, links) {
+ ret = gb_control_get_bundle_version(control, bundle);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+/* Get Manifest's size from the interface */
+int gb_control_get_manifest_size_operation(struct gb_interface *intf)
+{
+ struct gb_control_get_manifest_size_response response;
+ struct gb_connection *connection = intf->control->connection;
+ int ret;
+
+ ret = gb_operation_sync(connection, GB_CONTROL_TYPE_GET_MANIFEST_SIZE,
+ NULL, 0, &response, sizeof(response));
+ if (ret) {
+ dev_err(&connection->intf->dev,
+ "failed to get manifest size: %d\n", ret);
+ return ret;
+ }
+
+ return le16_to_cpu(response.size);
+}
+
+/* Reads Manifest from the interface */
+int gb_control_get_manifest_operation(struct gb_interface *intf, void *manifest,
+ size_t size)
+{
+ struct gb_connection *connection = intf->control->connection;
+
+ return gb_operation_sync(connection, GB_CONTROL_TYPE_GET_MANIFEST,
+ NULL, 0, manifest, size);
+}
+
+int gb_control_connected_operation(struct gb_control *control, u16 cport_id)
+{
+ struct gb_control_connected_request request;
+
+ request.cport_id = cpu_to_le16(cport_id);
+ return gb_operation_sync(control->connection, GB_CONTROL_TYPE_CONNECTED,
+ &request, sizeof(request), NULL, 0);
+}
+
+int gb_control_disconnected_operation(struct gb_control *control, u16 cport_id)
+{
+ struct gb_control_disconnected_request request;
+
+ request.cport_id = cpu_to_le16(cport_id);
+ return gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_DISCONNECTED, &request,
+ sizeof(request), NULL, 0);
+}
+
+int gb_control_disconnecting_operation(struct gb_control *control,
+ u16 cport_id)
+{
+ struct gb_control_disconnecting_request *request;
+ struct gb_operation *operation;
+ int ret;
+
+ operation = gb_operation_create_core(control->connection,
+ GB_CONTROL_TYPE_DISCONNECTING,
+ sizeof(*request), 0, 0,
+ GFP_KERNEL);
+ if (!operation)
+ return -ENOMEM;
+
+ request = operation->request->payload;
+ request->cport_id = cpu_to_le16(cport_id);
+
+ ret = gb_operation_request_send_sync(operation);
+ if (ret) {
+ dev_err(&control->dev, "failed to send disconnecting: %d\n",
+ ret);
+ }
+
+ gb_operation_put(operation);
+
+ return ret;
+}
+
+int gb_control_mode_switch_operation(struct gb_control *control)
+{
+ struct gb_operation *operation;
+ int ret;
+
+ operation = gb_operation_create_core(control->connection,
+ GB_CONTROL_TYPE_MODE_SWITCH,
+ 0, 0, GB_OPERATION_FLAG_UNIDIRECTIONAL,
+ GFP_KERNEL);
+ if (!operation)
+ return -ENOMEM;
+
+ ret = gb_operation_request_send_sync(operation);
+ if (ret)
+ dev_err(&control->dev, "failed to send mode switch: %d\n", ret);
+
+ gb_operation_put(operation);
+
+ return ret;
+}
+
+int gb_control_timesync_enable(struct gb_control *control, u8 count,
+ u64 frame_time, u32 strobe_delay, u32 refclk)
+{
+ struct gb_control_timesync_enable_request request;
+
+ request.count = count;
+ request.frame_time = cpu_to_le64(frame_time);
+ request.strobe_delay = cpu_to_le32(strobe_delay);
+ request.refclk = cpu_to_le32(refclk);
+ return gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_TIMESYNC_ENABLE, &request,
+ sizeof(request), NULL, 0);
+}
+
+int gb_control_timesync_disable(struct gb_control *control)
+{
+ return gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_TIMESYNC_DISABLE, NULL, 0,
+ NULL, 0);
+}
+
+int gb_control_timesync_get_last_event(struct gb_control *control,
+ u64 *frame_time)
+{
+ struct gb_control_timesync_get_last_event_response response;
+ int ret;
+
+ ret = gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_TIMESYNC_GET_LAST_EVENT,
+ NULL, 0, &response, sizeof(response));
+ if (!ret)
+ *frame_time = le64_to_cpu(response.frame_time);
+ return ret;
+}
+
+int gb_control_timesync_authoritative(struct gb_control *control,
+ u64 *frame_time)
+{
+ struct gb_control_timesync_authoritative_request request;
+ int i;
+
+ for (i = 0; i < GB_TIMESYNC_MAX_STROBES; i++)
+ request.frame_time[i] = cpu_to_le64(frame_time[i]);
+
+ return gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_TIMESYNC_AUTHORITATIVE,
+ &request, sizeof(request),
+ NULL, 0);
+}
+
+static int gb_control_bundle_pm_status_map(u8 status)
+{
+ switch (status) {
+ case GB_CONTROL_BUNDLE_PM_INVAL:
+ return -EINVAL;
+ case GB_CONTROL_BUNDLE_PM_BUSY:
+ return -EBUSY;
+ case GB_CONTROL_BUNDLE_PM_NA:
+ return -ENOMSG;
+ case GB_CONTROL_BUNDLE_PM_FAIL:
+ default:
+ return -EREMOTEIO;
+ }
+}
+
+int gb_control_bundle_suspend(struct gb_control *control, u8 bundle_id)
+{
+ struct gb_control_bundle_pm_request request;
+ struct gb_control_bundle_pm_response response;
+ int ret;
+
+ request.bundle_id = bundle_id;
+ ret = gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_BUNDLE_SUSPEND, &request,
+ sizeof(request), &response, sizeof(response));
+ if (ret) {
+ dev_err(&control->dev, "failed to send bundle %u suspend: %d\n",
+ bundle_id, ret);
+ return ret;
+ }
+
+ if (response.status != GB_CONTROL_BUNDLE_PM_OK) {
+ dev_err(&control->dev, "failed to suspend bundle %u: %d\n",
+ bundle_id, response.status);
+ return gb_control_bundle_pm_status_map(response.status);
+ }
+
+ return 0;
+}
+
+int gb_control_bundle_resume(struct gb_control *control, u8 bundle_id)
+{
+ struct gb_control_bundle_pm_request request;
+ struct gb_control_bundle_pm_response response;
+ int ret;
+
+ request.bundle_id = bundle_id;
+ ret = gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_BUNDLE_RESUME, &request,
+ sizeof(request), &response, sizeof(response));
+ if (ret) {
+ dev_err(&control->dev, "failed to send bundle %u resume: %d\n",
+ bundle_id, ret);
+ return ret;
+ }
+
+ if (response.status != GB_CONTROL_BUNDLE_PM_OK) {
+ dev_err(&control->dev, "failed to resume bundle %u: %d\n",
+ bundle_id, response.status);
+ return gb_control_bundle_pm_status_map(response.status);
+ }
+
+ return 0;
+}
+
+int gb_control_bundle_deactivate(struct gb_control *control, u8 bundle_id)
+{
+ struct gb_control_bundle_pm_request request;
+ struct gb_control_bundle_pm_response response;
+ int ret;
+
+ request.bundle_id = bundle_id;
+ ret = gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_BUNDLE_DEACTIVATE, &request,
+ sizeof(request), &response, sizeof(response));
+ if (ret) {
+ dev_err(&control->dev,
+ "failed to send bundle %u deactivate: %d\n", bundle_id,
+ ret);
+ return ret;
+ }
+
+ if (response.status != GB_CONTROL_BUNDLE_PM_OK) {
+ dev_err(&control->dev, "failed to deactivate bundle %u: %d\n",
+ bundle_id, response.status);
+ return gb_control_bundle_pm_status_map(response.status);
+ }
+
+ return 0;
+}
+
+int gb_control_bundle_activate(struct gb_control *control, u8 bundle_id)
+{
+ struct gb_control_bundle_pm_request request;
+ struct gb_control_bundle_pm_response response;
+ int ret;
+
+ if (!control->has_bundle_activate)
+ return 0;
+
+ request.bundle_id = bundle_id;
+ ret = gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_BUNDLE_ACTIVATE, &request,
+ sizeof(request), &response, sizeof(response));
+ if (ret) {
+ dev_err(&control->dev,
+ "failed to send bundle %u activate: %d\n", bundle_id,
+ ret);
+ return ret;
+ }
+
+ if (response.status != GB_CONTROL_BUNDLE_PM_OK) {
+ dev_err(&control->dev, "failed to activate bundle %u: %d\n",
+ bundle_id, response.status);
+ return gb_control_bundle_pm_status_map(response.status);
+ }
+
+ return 0;
+}
+
+static int gb_control_interface_pm_status_map(u8 status)
+{
+ switch (status) {
+ case GB_CONTROL_INTF_PM_BUSY:
+ return -EBUSY;
+ case GB_CONTROL_INTF_PM_NA:
+ return -ENOMSG;
+ default:
+ return -EREMOTEIO;
+ }
+}
+
+int gb_control_interface_suspend_prepare(struct gb_control *control)
+{
+ struct gb_control_intf_pm_response response;
+ int ret;
+
+ ret = gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_INTF_SUSPEND_PREPARE, NULL, 0,
+ &response, sizeof(response));
+ if (ret) {
+ dev_err(&control->dev,
+ "failed to send interface suspend prepare: %d\n", ret);
+ return ret;
+ }
+
+ if (response.status != GB_CONTROL_INTF_PM_OK) {
+ dev_err(&control->dev, "interface error while preparing suspend: %d\n",
+ response.status);
+ return gb_control_interface_pm_status_map(response.status);
+ }
+
+ return 0;
+}
+
+int gb_control_interface_deactivate_prepare(struct gb_control *control)
+{
+ struct gb_control_intf_pm_response response;
+ int ret;
+
+ ret = gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_INTF_DEACTIVATE_PREPARE, NULL,
+ 0, &response, sizeof(response));
+ if (ret) {
+ dev_err(&control->dev, "failed to send interface deactivate prepare: %d\n",
+ ret);
+ return ret;
+ }
+
+ if (response.status != GB_CONTROL_INTF_PM_OK) {
+ dev_err(&control->dev, "interface error while preparing deactivate: %d\n",
+ response.status);
+ return gb_control_interface_pm_status_map(response.status);
+ }
+
+ return 0;
+}
+
+int gb_control_interface_hibernate_abort(struct gb_control *control)
+{
+ struct gb_control_intf_pm_response response;
+ int ret;
+
+ ret = gb_operation_sync(control->connection,
+ GB_CONTROL_TYPE_INTF_HIBERNATE_ABORT, NULL, 0,
+ &response, sizeof(response));
+ if (ret) {
+ dev_err(&control->dev,
+ "failed to send interface aborting hibernate: %d\n",
+ ret);
+ return ret;
+ }
+
+ if (response.status != GB_CONTROL_INTF_PM_OK) {
+ dev_err(&control->dev, "interface error while aborting hibernate: %d\n",
+ response.status);
+ return gb_control_interface_pm_status_map(response.status);
+ }
+
+ return 0;
+}
+
+static ssize_t vendor_string_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct gb_control *control = to_gb_control(dev);
+
+ return scnprintf(buf, PAGE_SIZE, "%s\n", control->vendor_string);
+}
+static DEVICE_ATTR_RO(vendor_string);
+
+static ssize_t product_string_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct gb_control *control = to_gb_control(dev);
+
+ return scnprintf(buf, PAGE_SIZE, "%s\n", control->product_string);
+}
+static DEVICE_ATTR_RO(product_string);
+
+static struct attribute *control_attrs[] = {
+ &dev_attr_vendor_string.attr,
+ &dev_attr_product_string.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(control);
+
+static void gb_control_release(struct device *dev)
+{
+ struct gb_control *control = to_gb_control(dev);
+
+ gb_connection_destroy(control->connection);
+
+ kfree(control->vendor_string);
+ kfree(control->product_string);
+
+ kfree(control);
+}
+
+struct device_type greybus_control_type = {
+ .name = "greybus_control",
+ .release = gb_control_release,
+};
+
+struct gb_control *gb_control_create(struct gb_interface *intf)
+{
+ struct gb_connection *connection;
+ struct gb_control *control;
+
+ control = kzalloc(sizeof(*control), GFP_KERNEL);
+ if (!control)
+ return ERR_PTR(-ENOMEM);
+
+ control->intf = intf;
+
+ connection = gb_connection_create_control(intf);
+ if (IS_ERR(connection)) {
+ dev_err(&intf->dev,
+ "failed to create control connection: %ld\n",
+ PTR_ERR(connection));
+ kfree(control);
+ return ERR_CAST(connection);
+ }
+
+ control->connection = connection;
+
+ control->dev.parent = &intf->dev;
+ control->dev.bus = &greybus_bus_type;
+ control->dev.type = &greybus_control_type;
+ control->dev.groups = control_groups;
+ control->dev.dma_mask = intf->dev.dma_mask;
+ device_initialize(&control->dev);
+ dev_set_name(&control->dev, "%s.ctrl", dev_name(&intf->dev));
+
+ gb_connection_set_data(control->connection, control);
+
+ return control;
+}
+
+int gb_control_enable(struct gb_control *control)
+{
+ int ret;
+
+ dev_dbg(&control->connection->intf->dev, "%s\n", __func__);
+
+ ret = gb_connection_enable_tx(control->connection);
+ if (ret) {
+ dev_err(&control->connection->intf->dev,
+ "failed to enable control connection: %d\n",
+ ret);
+ return ret;
+ }
+
+ ret = gb_control_get_version(control);
+ if (ret)
+ goto err_disable_connection;
+
+ if (control->protocol_major > 0 || control->protocol_minor > 1)
+ control->has_bundle_version = true;
+
+ /* FIXME: use protocol version instead */
+ if (!(control->intf->quirks & GB_INTERFACE_QUIRK_NO_BUNDLE_ACTIVATE))
+ control->has_bundle_activate = true;
+
+ return 0;
+
+err_disable_connection:
+ gb_connection_disable(control->connection);
+
+ return ret;
+}
+
+void gb_control_disable(struct gb_control *control)
+{
+ dev_dbg(&control->connection->intf->dev, "%s\n", __func__);
+
+ if (control->intf->disconnected)
+ gb_connection_disable_forced(control->connection);
+ else
+ gb_connection_disable(control->connection);
+}
+
+int gb_control_suspend(struct gb_control *control)
+{
+ gb_connection_disable(control->connection);
+
+ return 0;
+}
+
+int gb_control_resume(struct gb_control *control)
+{
+ int ret;
+
+ ret = gb_connection_enable_tx(control->connection);
+ if (ret) {
+ dev_err(&control->connection->intf->dev,
+ "failed to enable control connection: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+int gb_control_add(struct gb_control *control)
+{
+ int ret;
+
+ ret = device_add(&control->dev);
+ if (ret) {
+ dev_err(&control->dev,
+ "failed to register control device: %d\n",
+ ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+void gb_control_del(struct gb_control *control)
+{
+ if (device_is_registered(&control->dev))
+ device_del(&control->dev);
+}
+
+struct gb_control *gb_control_get(struct gb_control *control)
+{
+ get_device(&control->dev);
+
+ return control;
+}
+
+void gb_control_put(struct gb_control *control)
+{
+ put_device(&control->dev);
+}
+
+void gb_control_mode_switch_prepare(struct gb_control *control)
+{
+ gb_connection_mode_switch_prepare(control->connection);
+}
+
+void gb_control_mode_switch_complete(struct gb_control *control)
+{
+ gb_connection_mode_switch_complete(control->connection);
+}
--- /dev/null
+++ b/drivers/greybus/control.h
@@ -0,0 +1,65 @@
+/*
+ * Greybus CPort control protocol
+ *
+ * Copyright 2015 Google Inc.
+ * Copyright 2015 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#ifndef __CONTROL_H
+#define __CONTROL_H
+
+struct gb_control {
+ struct device dev;
+ struct gb_interface *intf;
+
+ struct gb_connection *connection;
+
+ u8 protocol_major;
+ u8 protocol_minor;
+
+ bool has_bundle_activate;
+ bool has_bundle_version;
+
+ char *vendor_string;
+ char *product_string;
+};
+#define to_gb_control(d) container_of(d, struct gb_control, dev)
+
+struct gb_control *gb_control_create(struct gb_interface *intf);
+int gb_control_enable(struct gb_control *control);
+void gb_control_disable(struct gb_control *control);
+int gb_control_suspend(struct gb_control *control);
+int gb_control_resume(struct gb_control *control);
+int gb_control_add(struct gb_control *control);
+void gb_control_del(struct gb_control *control);
+struct gb_control *gb_control_get(struct gb_control *control);
+void gb_control_put(struct gb_control *control);
+
+int gb_control_get_bundle_versions(struct gb_control *control);
+int gb_control_connected_operation(struct gb_control *control, u16 cport_id);
+int gb_control_disconnected_operation(struct gb_control *control, u16 cport_id);
+int gb_control_disconnecting_operation(struct gb_control *control,
+ u16 cport_id);
+int gb_control_mode_switch_operation(struct gb_control *control);
+void gb_control_mode_switch_prepare(struct gb_control *control);
+void gb_control_mode_switch_complete(struct gb_control *control);
+int gb_control_get_manifest_size_operation(struct gb_interface *intf);
+int gb_control_get_manifest_operation(struct gb_interface *intf, void *manifest,
+ size_t size);
+int gb_control_timesync_enable(struct gb_control *control, u8 count,
+ u64 frame_time, u32 strobe_delay, u32 refclk);
+int gb_control_timesync_disable(struct gb_control *control);
+int gb_control_timesync_get_last_event(struct gb_control *control,
+ u64 *frame_time);
+int gb_control_timesync_authoritative(struct gb_control *control,
+ u64 *frame_time);
+int gb_control_bundle_suspend(struct gb_control *control, u8 bundle_id);
+int gb_control_bundle_resume(struct gb_control *control, u8 bundle_id);
+int gb_control_bundle_deactivate(struct gb_control *control, u8 bundle_id);
+int gb_control_bundle_activate(struct gb_control *control, u8 bundle_id);
+int gb_control_interface_suspend_prepare(struct gb_control *control);
+int gb_control_interface_deactivate_prepare(struct gb_control *control);
+int gb_control_interface_hibernate_abort(struct gb_control *control);
+#endif /* __CONTROL_H */
--- /dev/null
+++ b/drivers/greybus/core.c
@@ -0,0 +1,361 @@
+/*
+ * Greybus "Core"
+ *
+ * Copyright 2014-2015 Google Inc.
+ * Copyright 2014-2015 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#define CREATE_TRACE_POINTS
+#include "greybus.h"
+#include "greybus_trace.h"
+
+#define GB_BUNDLE_AUTOSUSPEND_MS 3000
+
+/* Allow greybus to be disabled at boot if needed */
+static bool nogreybus;
+#ifdef MODULE
+module_param(nogreybus, bool, 0444);
+#else
+core_param(nogreybus, nogreybus, bool, 0444);
+#endif
+int greybus_disabled(void)
+{
+ return nogreybus;
+}
+EXPORT_SYMBOL_GPL(greybus_disabled);
+
+static bool greybus_match_one_id(struct gb_bundle *bundle,
+ const struct greybus_bundle_id *id)
+{
+ if ((id->match_flags & GREYBUS_ID_MATCH_VENDOR) &&
+ (id->vendor != bundle->intf->vendor_id))
+ return false;
+
+ if ((id->match_flags & GREYBUS_ID_MATCH_PRODUCT) &&
+ (id->product != bundle->intf->product_id))
+ return false;
+
+ if ((id->match_flags & GREYBUS_ID_MATCH_CLASS) &&
+ (id->class != bundle->class))
+ return false;
+
+ return true;
+}
+
+static const struct greybus_bundle_id *
+greybus_match_id(struct gb_bundle *bundle, const struct greybus_bundle_id *id)
+{
+ if (id == NULL)
+ return NULL;
+
+ for (; id->vendor || id->product || id->class || id->driver_info;
+ id++) {
+ if (greybus_match_one_id(bundle, id))
+ return id;
+ }
+
+ return NULL;
+}
+
+static int greybus_match_device(struct device *dev, struct device_driver *drv)
+{
+ struct greybus_driver *driver = to_greybus_driver(drv);
+ struct gb_bundle *bundle;
+ const struct greybus_bundle_id *id;
+
+ if (!is_gb_bundle(dev))
+ return 0;
+
+ bundle = to_gb_bundle(dev);
+
+ id = greybus_match_id(bundle, driver->id_table);
+ if (id)
+ return 1;
+ /* FIXME - Dynamic ids? */
+ return 0;
+}
+
+static int greybus_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ struct gb_host_device *hd;
+ struct gb_module *module = NULL;
+ struct gb_interface *intf = NULL;
+ struct gb_control *control = NULL;
+ struct gb_bundle *bundle = NULL;
+ struct gb_svc *svc = NULL;
+
+ if (is_gb_host_device(dev)) {
+ hd = to_gb_host_device(dev);
+ } else if (is_gb_module(dev)) {
+ module = to_gb_module(dev);
+ hd = module->hd;
+ } else if (is_gb_interface(dev)) {
+ intf = to_gb_interface(dev);
+ module = intf->module;
+ hd = intf->hd;
+ } else if (is_gb_control(dev)) {
+ control = to_gb_control(dev);
+ intf = control->intf;
+ module = intf->module;
+ hd = intf->hd;
+ } else if (is_gb_bundle(dev)) {
+ bundle = to_gb_bundle(dev);
+ intf = bundle->intf;
+ module = intf->module;
+ hd = intf->hd;
+ } else if (is_gb_svc(dev)) {
+ svc = to_gb_svc(dev);
+ hd = svc->hd;
+ } else {
+ dev_WARN(dev, "uevent for unknown greybus device \"type\"!\n");
+ return -EINVAL;
+ }
+
+ if (add_uevent_var(env, "BUS=%u", hd->bus_id))
+ return -ENOMEM;
+
+ if (module) {
+ if (add_uevent_var(env, "MODULE=%u", module->module_id))
+ return -ENOMEM;
+ }
+
+ if (intf) {
+ if (add_uevent_var(env, "INTERFACE=%u", intf->interface_id))
+ return -ENOMEM;
+ if (add_uevent_var(env, "GREYBUS_ID=%08x/%08x",
+ intf->vendor_id, intf->product_id))
+ return -ENOMEM;
+ }
+
+ if (bundle) {
+ // FIXME
+ // add a uevent that can "load" a bundle type
+ // This is what we need to bind a driver to so use the info
+ // in gmod here as well
+
+ if (add_uevent_var(env, "BUNDLE=%u", bundle->id))
+ return -ENOMEM;
+ if (add_uevent_var(env, "BUNDLE_CLASS=%02x", bundle->class))
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static void greybus_shutdown(struct device *dev)
+{
+ if (is_gb_host_device(dev)) {
+ struct gb_host_device *hd;
+
+ hd = to_gb_host_device(dev);
+ gb_hd_shutdown(hd);
+ }
+}
+
+struct bus_type greybus_bus_type = {
+ .name = "greybus",
+ .match = greybus_match_device,
+ .uevent = greybus_uevent,
+ .shutdown = greybus_shutdown,
+};
+
+static int greybus_probe(struct device *dev)
+{
+ struct greybus_driver *driver = to_greybus_driver(dev->driver);
+ struct gb_bundle *bundle = to_gb_bundle(dev);
+ const struct greybus_bundle_id *id;
+ int retval;
+
+ /* match id */
+ id = greybus_match_id(bundle, driver->id_table);
+ if (!id)
+ return -ENODEV;
+
+ retval = pm_runtime_get_sync(&bundle->intf->dev);
+ if (retval < 0) {
+ pm_runtime_put_noidle(&bundle->intf->dev);
+ return retval;
+ }
+
+ retval = gb_control_bundle_activate(bundle->intf->control, bundle->id);
+ if (retval) {
+ pm_runtime_put(&bundle->intf->dev);
+ return retval;
+ }
+
+ /*
+ * Unbound bundle devices are always deactivated. During probe, the
+ * Runtime PM is set to enabled and active and the usage count is
+ * incremented. If the driver supports runtime PM, it should call
+ * pm_runtime_put() in its probe routine and pm_runtime_get_sync()
+ * in remove routine.
+ */
+ pm_runtime_set_autosuspend_delay(dev, GB_BUNDLE_AUTOSUSPEND_MS);
+ pm_runtime_use_autosuspend(dev);
+ pm_runtime_get_noresume(dev);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+
+ retval = driver->probe(bundle, id);
+ if (retval) {
+ /*
+ * Catch buggy drivers that fail to destroy their connections.
+ */
+ WARN_ON(!list_empty(&bundle->connections));
+
+ gb_control_bundle_deactivate(bundle->intf->control, bundle->id);
+
+ pm_runtime_disable(dev);
+ pm_runtime_set_suspended(dev);
+ pm_runtime_put_noidle(dev);
+ pm_runtime_dont_use_autosuspend(dev);
+ pm_runtime_put(&bundle->intf->dev);
+
+ return retval;
+ }
+
+ gb_timesync_schedule_synchronous(bundle->intf);
+
+ pm_runtime_put(&bundle->intf->dev);
+
+ return 0;
+}
+
+static int greybus_remove(struct device *dev)
+{
+ struct greybus_driver *driver = to_greybus_driver(dev->driver);
+ struct gb_bundle *bundle = to_gb_bundle(dev);
+ struct gb_connection *connection;
+ int retval;
+
+ retval = pm_runtime_get_sync(dev);
+ if (retval < 0)
+ dev_err(dev, "failed to resume bundle: %d\n", retval);
+
+ /*
+ * Disable (non-offloaded) connections early in case the interface is
+ * already gone to avoid unceccessary operation timeouts during
+ * driver disconnect. Otherwise, only disable incoming requests.
+ */
+ list_for_each_entry(connection, &bundle->connections, bundle_links) {
+ if (gb_connection_is_offloaded(connection))
+ continue;
+
+ if (bundle->intf->disconnected)
+ gb_connection_disable_forced(connection);
+ else
+ gb_connection_disable_rx(connection);
+ }
+
+ driver->disconnect(bundle);
+
+ /* Catch buggy drivers that fail to destroy their connections. */
+ WARN_ON(!list_empty(&bundle->connections));
+
+ if (!bundle->intf->disconnected)
+ gb_control_bundle_deactivate(bundle->intf->control, bundle->id);
+
+ pm_runtime_put_noidle(dev);
+ pm_runtime_disable(dev);
+ pm_runtime_set_suspended(dev);
+ pm_runtime_dont_use_autosuspend(dev);
+ pm_runtime_put_noidle(dev);
+
+ return 0;
+}
+
+int greybus_register_driver(struct greybus_driver *driver, struct module *owner,
+ const char *mod_name)
+{
+ int retval;
+
+ if (greybus_disabled())
+ return -ENODEV;
+
+ driver->driver.bus = &greybus_bus_type;
+ driver->driver.name = driver->name;
+ driver->driver.probe = greybus_probe;
+ driver->driver.remove = greybus_remove;
+ driver->driver.owner = owner;
+ driver->driver.mod_name = mod_name;
+
+ retval = driver_register(&driver->driver);
+ if (retval)
+ return retval;
+
+ pr_info("registered new driver %s\n", driver->name);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(greybus_register_driver);
+
+void greybus_deregister_driver(struct greybus_driver *driver)
+{
+ driver_unregister(&driver->driver);
+}
+EXPORT_SYMBOL_GPL(greybus_deregister_driver);
+
+static int __init gb_init(void)
+{
+ int retval;
+
+ if (greybus_disabled())
+ return -ENODEV;
+
+ BUILD_BUG_ON(CPORT_ID_MAX >= (long)CPORT_ID_BAD);
+
+ gb_debugfs_init();
+
+ retval = bus_register(&greybus_bus_type);
+ if (retval) {
+ pr_err("bus_register failed (%d)\n", retval);
+ goto error_bus;
+ }
+
+ retval = gb_hd_init();
+ if (retval) {
+ pr_err("gb_hd_init failed (%d)\n", retval);
+ goto error_hd;
+ }
+
+ retval = gb_operation_init();
+ if (retval) {
+ pr_err("gb_operation_init failed (%d)\n", retval);
+ goto error_operation;
+ }
+
+ retval = gb_timesync_init();
+ if (retval) {
+ pr_err("gb_timesync_init failed\n");
+ goto error_timesync;
+ }
+ return 0; /* Success */
+
+error_timesync:
+ gb_operation_exit();
+error_operation:
+ gb_hd_exit();
+error_hd:
+ bus_unregister(&greybus_bus_type);
+error_bus:
+ gb_debugfs_cleanup();
+
+ return retval;
+}
+module_init(gb_init);
+
+static void __exit gb_exit(void)
+{
+ gb_timesync_exit();
+ gb_operation_exit();
+ gb_hd_exit();
+ bus_unregister(&greybus_bus_type);
+ gb_debugfs_cleanup();
+ tracepoint_synchronize_unregister();
+}
+module_exit(gb_exit);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@...uxfoundation.org>");
--- /dev/null
+++ b/drivers/greybus/debugfs.c
@@ -0,0 +1,31 @@
+/*
+ * Greybus debugfs code
+ *
+ * Copyright 2014 Google Inc.
+ * Copyright 2014 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#include <linux/debugfs.h>
+
+#include "greybus.h"
+
+static struct dentry *gb_debug_root;
+
+void __init gb_debugfs_init(void)
+{
+ gb_debug_root = debugfs_create_dir("greybus", NULL);
+}
+
+void gb_debugfs_cleanup(void)
+{
+ debugfs_remove_recursive(gb_debug_root);
+ gb_debug_root = NULL;
+}
+
+struct dentry *gb_debugfs_get(void)
+{
+ return gb_debug_root;
+}
+EXPORT_SYMBOL_GPL(gb_debugfs_get);
--- /dev/null
+++ b/drivers/greybus/greybus.h
@@ -0,0 +1,154 @@
+/*
+ * Greybus driver and device API
+ *
+ * Copyright 2014-2015 Google Inc.
+ * Copyright 2014-2015 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#ifndef __LINUX_GREYBUS_H
+#define __LINUX_GREYBUS_H
+
+#ifdef __KERNEL__
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/idr.h>
+
+#include "greybus_id.h"
+#include "greybus_manifest.h"
+#include "greybus_protocols.h"
+#include "manifest.h"
+#include "hd.h"
+#include "svc.h"
+#include "control.h"
+#include "module.h"
+#include "interface.h"
+#include "bundle.h"
+#include "connection.h"
+#include "operation.h"
+#include "timesync.h"
+
+/* Matches up with the Greybus Protocol specification document */
+#define GREYBUS_VERSION_MAJOR 0x00
+#define GREYBUS_VERSION_MINOR 0x01
+
+#define GREYBUS_ID_MATCH_DEVICE \
+ (GREYBUS_ID_MATCH_VENDOR | GREYBUS_ID_MATCH_PRODUCT)
+
+#define GREYBUS_DEVICE(v, p) \
+ .match_flags = GREYBUS_ID_MATCH_DEVICE, \
+ .vendor = (v), \
+ .product = (p),
+
+#define GREYBUS_DEVICE_CLASS(c) \
+ .match_flags = GREYBUS_ID_MATCH_CLASS, \
+ .class = (c),
+
+/* Maximum number of CPorts */
+#define CPORT_ID_MAX 4095 /* UniPro max id is 4095 */
+#define CPORT_ID_BAD U16_MAX
+
+struct greybus_driver {
+ const char *name;
+
+ int (*probe)(struct gb_bundle *bundle,
+ const struct greybus_bundle_id *id);
+ void (*disconnect)(struct gb_bundle *bundle);
+
+ const struct greybus_bundle_id *id_table;
+
+ struct device_driver driver;
+};
+#define to_greybus_driver(d) container_of(d, struct greybus_driver, driver)
+
+static inline void greybus_set_drvdata(struct gb_bundle *bundle, void *data)
+{
+ dev_set_drvdata(&bundle->dev, data);
+}
+
+static inline void *greybus_get_drvdata(struct gb_bundle *bundle)
+{
+ return dev_get_drvdata(&bundle->dev);
+}
+
+/* Don't call these directly, use the module_greybus_driver() macro instead */
+int greybus_register_driver(struct greybus_driver *driver,
+ struct module *module, const char *mod_name);
+void greybus_deregister_driver(struct greybus_driver *driver);
+
+/* define to get proper THIS_MODULE and KBUILD_MODNAME values */
+#define greybus_register(driver) \
+ greybus_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)
+#define greybus_deregister(driver) \
+ greybus_deregister_driver(driver)
+
+/**
+ * module_greybus_driver() - Helper macro for registering a Greybus driver
+ * @__greybus_driver: greybus_driver structure
+ *
+ * Helper macro for Greybus drivers to set up proper module init / exit
+ * functions. Replaces module_init() and module_exit() and keeps people from
+ * printing pointless things to the kernel log when their driver is loaded.
+ */
+#define module_greybus_driver(__greybus_driver) \
+ module_driver(__greybus_driver, greybus_register, greybus_deregister)
+
+int greybus_disabled(void);
+
+void gb_debugfs_init(void);
+void gb_debugfs_cleanup(void);
+struct dentry *gb_debugfs_get(void);
+
+extern struct bus_type greybus_bus_type;
+
+extern struct device_type greybus_hd_type;
+extern struct device_type greybus_module_type;
+extern struct device_type greybus_interface_type;
+extern struct device_type greybus_control_type;
+extern struct device_type greybus_bundle_type;
+extern struct device_type greybus_svc_type;
+
+static inline int is_gb_host_device(const struct device *dev)
+{
+ return dev->type == &greybus_hd_type;
+}
+
+static inline int is_gb_module(const struct device *dev)
+{
+ return dev->type == &greybus_module_type;
+}
+
+static inline int is_gb_interface(const struct device *dev)
+{
+ return dev->type == &greybus_interface_type;
+}
+
+static inline int is_gb_control(const struct device *dev)
+{
+ return dev->type == &greybus_control_type;
+}
+
+static inline int is_gb_bundle(const struct device *dev)
+{
+ return dev->type == &greybus_bundle_type;
+}
+
+static inline int is_gb_svc(const struct device *dev)
+{
+ return dev->type == &greybus_svc_type;
+}
+
+static inline bool cport_id_valid(struct gb_host_device *hd, u16 cport_id)
+{
+ return cport_id != CPORT_ID_BAD && cport_id < hd->num_cports;
+}
+
+#endif /* __KERNEL__ */
+#endif /* __LINUX_GREYBUS_H */
--- /dev/null
+++ b/drivers/greybus/greybus_authentication.h
@@ -0,0 +1,120 @@
+/*
+ * Greybus Component Authentication User Header
+ *
+ * This file is provided under a dual BSD/GPLv2 license. When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2016 Google Inc. All rights reserved.
+ * Copyright(c) 2016 Linaro Ltd. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License 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 version 2 for more details.
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2016 Google Inc. All rights reserved.
+ * Copyright(c) 2016 Linaro Ltd. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. or Linaro Ltd. nor the names of
+ * its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written
+ * permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GOOGLE INC. OR
+ * LINARO LTD. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __GREYBUS_AUTHENTICATION_USER_H
+#define __GREYBUS_AUTHENTICATION_USER_H
+
+#include <linux/ioctl.h>
+#include <linux/types.h>
+
+#define CAP_CERTIFICATE_MAX_SIZE 1600
+#define CAP_SIGNATURE_MAX_SIZE 320
+
+/* Certificate class types */
+#define CAP_CERT_IMS_EAPC 0x00000001
+#define CAP_CERT_IMS_EASC 0x00000002
+#define CAP_CERT_IMS_EARC 0x00000003
+#define CAP_CERT_IMS_IAPC 0x00000004
+#define CAP_CERT_IMS_IASC 0x00000005
+#define CAP_CERT_IMS_IARC 0x00000006
+
+/* IMS Certificate response result codes */
+#define CAP_IMS_RESULT_CERT_FOUND 0x00
+#define CAP_IMS_RESULT_CERT_CLASS_INVAL 0x01
+#define CAP_IMS_RESULT_CERT_CORRUPT 0x02
+#define CAP_IMS_RESULT_CERT_NOT_FOUND 0x03
+
+/* Authentication types */
+#define CAP_AUTH_IMS_PRI 0x00000001
+#define CAP_AUTH_IMS_SEC 0x00000002
+#define CAP_AUTH_IMS_RSA 0x00000003
+
+/* Authenticate response result codes */
+#define CAP_AUTH_RESULT_CR_SUCCESS 0x00
+#define CAP_AUTH_RESULT_CR_BAD_TYPE 0x01
+#define CAP_AUTH_RESULT_CR_WRONG_EP 0x02
+#define CAP_AUTH_RESULT_CR_NO_KEY 0x03
+#define CAP_AUTH_RESULT_CR_SIG_FAIL 0x04
+
+
+/* IOCTL support */
+struct cap_ioc_get_endpoint_uid {
+ __u8 uid[8];
+} __attribute__ ((__packed__));
+
+struct cap_ioc_get_ims_certificate {
+ __u32 certificate_class;
+ __u32 certificate_id;
+
+ __u8 result_code;
+ __u32 cert_size;
+ __u8 certificate[CAP_CERTIFICATE_MAX_SIZE];
+} __attribute__ ((__packed__));
+
+struct cap_ioc_authenticate {
+ __u32 auth_type;
+ __u8 uid[8];
+ __u8 challenge[32];
+
+ __u8 result_code;
+ __u8 response[64];
+ __u32 signature_size;
+ __u8 signature[CAP_SIGNATURE_MAX_SIZE];
+} __attribute__ ((__packed__));
+
+#define CAP_IOCTL_BASE 'C'
+#define CAP_IOC_GET_ENDPOINT_UID _IOR(CAP_IOCTL_BASE, 0, struct cap_ioc_get_endpoint_uid)
+#define CAP_IOC_GET_IMS_CERTIFICATE _IOWR(CAP_IOCTL_BASE, 1, struct cap_ioc_get_ims_certificate)
+#define CAP_IOC_AUTHENTICATE _IOWR(CAP_IOCTL_BASE, 2, struct cap_ioc_authenticate)
+
+#endif /* __GREYBUS_AUTHENTICATION_USER_H */
--- /dev/null
+++ b/drivers/greybus/greybus_id.h
@@ -0,0 +1,26 @@
+/* FIXME
+ * move this to include/linux/mod_devicetable.h when merging
+ */
+
+#ifndef __LINUX_GREYBUS_ID_H
+#define __LINUX_GREYBUS_ID_H
+
+#include <linux/types.h>
+#include <linux/mod_devicetable.h>
+
+
+struct greybus_bundle_id {
+ __u16 match_flags;
+ __u32 vendor;
+ __u32 product;
+ __u8 class;
+
+ kernel_ulong_t driver_info __aligned(sizeof(kernel_ulong_t));
+};
+
+/* Used to match the greybus_bundle_id */
+#define GREYBUS_ID_MATCH_VENDOR BIT(0)
+#define GREYBUS_ID_MATCH_PRODUCT BIT(1)
+#define GREYBUS_ID_MATCH_CLASS BIT(2)
+
+#endif /* __LINUX_GREYBUS_ID_H */
--- /dev/null
+++ b/drivers/greybus/greybus_manifest.h
@@ -0,0 +1,177 @@
+/*
+ * Greybus manifest definition
+ *
+ * See "Greybus Application Protocol" document (version 0.1) for
+ * details on these values and structures.
+ *
+ * Copyright 2014-2015 Google Inc.
+ * Copyright 2014-2015 Linaro Ltd.
+ *
+ * Released under the GPLv2 and BSD licenses.
+ */
+
+#ifndef __GREYBUS_MANIFEST_H
+#define __GREYBUS_MANIFEST_H
+
+enum greybus_descriptor_type {
+ GREYBUS_TYPE_INVALID = 0x00,
+ GREYBUS_TYPE_INTERFACE = 0x01,
+ GREYBUS_TYPE_STRING = 0x02,
+ GREYBUS_TYPE_BUNDLE = 0x03,
+ GREYBUS_TYPE_CPORT = 0x04,
+};
+
+enum greybus_protocol {
+ GREYBUS_PROTOCOL_CONTROL = 0x00,
+ /* 0x01 is unused */
+ GREYBUS_PROTOCOL_GPIO = 0x02,
+ GREYBUS_PROTOCOL_I2C = 0x03,
+ GREYBUS_PROTOCOL_UART = 0x04,
+ GREYBUS_PROTOCOL_HID = 0x05,
+ GREYBUS_PROTOCOL_USB = 0x06,
+ GREYBUS_PROTOCOL_SDIO = 0x07,
+ GREYBUS_PROTOCOL_POWER_SUPPLY = 0x08,
+ GREYBUS_PROTOCOL_PWM = 0x09,
+ /* 0x0a is unused */
+ GREYBUS_PROTOCOL_SPI = 0x0b,
+ GREYBUS_PROTOCOL_DISPLAY = 0x0c,
+ GREYBUS_PROTOCOL_CAMERA_MGMT = 0x0d,
+ GREYBUS_PROTOCOL_SENSOR = 0x0e,
+ GREYBUS_PROTOCOL_LIGHTS = 0x0f,
+ GREYBUS_PROTOCOL_VIBRATOR = 0x10,
+ GREYBUS_PROTOCOL_LOOPBACK = 0x11,
+ GREYBUS_PROTOCOL_AUDIO_MGMT = 0x12,
+ GREYBUS_PROTOCOL_AUDIO_DATA = 0x13,
+ GREYBUS_PROTOCOL_SVC = 0x14,
+ GREYBUS_PROTOCOL_BOOTROM = 0x15,
+ GREYBUS_PROTOCOL_CAMERA_DATA = 0x16,
+ GREYBUS_PROTOCOL_FW_DOWNLOAD = 0x17,
+ GREYBUS_PROTOCOL_FW_MANAGEMENT = 0x18,
+ GREYBUS_PROTOCOL_AUTHENTICATION = 0x19,
+ GREYBUS_PROTOCOL_LOG = 0x1a,
+ /* ... */
+ GREYBUS_PROTOCOL_RAW = 0xfe,
+ GREYBUS_PROTOCOL_VENDOR = 0xff,
+};
+
+enum greybus_class_type {
+ GREYBUS_CLASS_CONTROL = 0x00,
+ /* 0x01 is unused */
+ /* 0x02 is unused */
+ /* 0x03 is unused */
+ /* 0x04 is unused */
+ GREYBUS_CLASS_HID = 0x05,
+ /* 0x06 is unused */
+ /* 0x07 is unused */
+ GREYBUS_CLASS_POWER_SUPPLY = 0x08,
+ /* 0x09 is unused */
+ GREYBUS_CLASS_BRIDGED_PHY = 0x0a,
+ /* 0x0b is unused */
+ GREYBUS_CLASS_DISPLAY = 0x0c,
+ GREYBUS_CLASS_CAMERA = 0x0d,
+ GREYBUS_CLASS_SENSOR = 0x0e,
+ GREYBUS_CLASS_LIGHTS = 0x0f,
+ GREYBUS_CLASS_VIBRATOR = 0x10,
+ GREYBUS_CLASS_LOOPBACK = 0x11,
+ GREYBUS_CLASS_AUDIO = 0x12,
+ /* 0x13 is unused */
+ /* 0x14 is unused */
+ GREYBUS_CLASS_BOOTROM = 0x15,
+ GREYBUS_CLASS_FW_MANAGEMENT = 0x16,
+ GREYBUS_CLASS_LOG = 0x17,
+ /* ... */
+ GREYBUS_CLASS_RAW = 0xfe,
+ GREYBUS_CLASS_VENDOR = 0xff,
+};
+
+enum {
+ GREYBUS_INTERFACE_FEATURE_TIMESYNC = BIT(0),
+};
+
+/*
+ * The string in a string descriptor is not NUL-terminated. The
+ * size of the descriptor will be rounded up to a multiple of 4
+ * bytes, by padding the string with 0x00 bytes if necessary.
+ */
+struct greybus_descriptor_string {
+ __u8 length;
+ __u8 id;
+ __u8 string[0];
+} __packed;
+
+/*
+ * An interface descriptor describes information about an interface as a whole,
+ * *not* the functions within it.
+ */
+struct greybus_descriptor_interface {
+ __u8 vendor_stringid;
+ __u8 product_stringid;
+ __u8 features;
+ __u8 pad;
+} __packed;
+
+/*
+ * An bundle descriptor defines an identification number and a class for
+ * each bundle.
+ *
+ * @id: Uniquely identifies a bundle within a interface, its sole purpose is to
+ * allow CPort descriptors to specify which bundle they are associated with.
+ * The first bundle will have id 0, second will have 1 and so on.
+ *
+ * The largest CPort id associated with an bundle (defined by a
+ * CPort descriptor in the manifest) is used to determine how to
+ * encode the device id and module number in UniPro packets
+ * that use the bundle.
+ *
+ * @class: It is used by kernel to know the functionality provided by the
+ * bundle and will be matched against drivers functinality while probing greybus
+ * driver. It should contain one of the values defined in
+ * 'enum greybus_class_type'.
+ *
+ */
+struct greybus_descriptor_bundle {
+ __u8 id; /* interface-relative id (0..) */
+ __u8 class;
+ __u8 pad[2];
+} __packed;
+
+/*
+ * A CPort descriptor indicates the id of the bundle within the
+ * module it's associated with, along with the CPort id used to
+ * address the CPort. The protocol id defines the format of messages
+ * exchanged using the CPort.
+ */
+struct greybus_descriptor_cport {
+ __le16 id;
+ __u8 bundle;
+ __u8 protocol_id; /* enum greybus_protocol */
+} __packed;
+
+struct greybus_descriptor_header {
+ __le16 size;
+ __u8 type; /* enum greybus_descriptor_type */
+ __u8 pad;
+} __packed;
+
+struct greybus_descriptor {
+ struct greybus_descriptor_header header;
+ union {
+ struct greybus_descriptor_string string;
+ struct greybus_descriptor_interface interface;
+ struct greybus_descriptor_bundle bundle;
+ struct greybus_descriptor_cport cport;
+ };
+} __packed;
+
+struct greybus_manifest_header {
+ __le16 size;
+ __u8 version_major;
+ __u8 version_minor;
+} __packed;
+
+struct greybus_manifest {
+ struct greybus_manifest_header header;
+ struct greybus_descriptor descriptors[0];
+} __packed;
+
+#endif /* __GREYBUS_MANIFEST_H */
--- /dev/null
+++ b/drivers/greybus/manifest.c
@@ -0,0 +1,535 @@
+/*
+ * Greybus manifest parsing
+ *
+ * Copyright 2014-2015 Google Inc.
+ * Copyright 2014-2015 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#include "greybus.h"
+
+static const char *get_descriptor_type_string(u8 type)
+{
+ switch(type) {
+ case GREYBUS_TYPE_INVALID:
+ return "invalid";
+ case GREYBUS_TYPE_STRING:
+ return "string";
+ case GREYBUS_TYPE_INTERFACE:
+ return "interface";
+ case GREYBUS_TYPE_CPORT:
+ return "cport";
+ case GREYBUS_TYPE_BUNDLE:
+ return "bundle";
+ default:
+ WARN_ON(1);
+ return "unknown";
+ }
+}
+
+/*
+ * We scan the manifest once to identify where all the descriptors
+ * are. The result is a list of these manifest_desc structures. We
+ * then pick through them for what we're looking for (starting with
+ * the interface descriptor). As each is processed we remove it from
+ * the list. When we're done the list should (probably) be empty.
+ */
+struct manifest_desc {
+ struct list_head links;
+
+ size_t size;
+ void *data;
+ enum greybus_descriptor_type type;
+};
+
+static void release_manifest_descriptor(struct manifest_desc *descriptor)
+{
+ list_del(&descriptor->links);
+ kfree(descriptor);
+}
+
+static void release_manifest_descriptors(struct gb_interface *intf)
+{
+ struct manifest_desc *descriptor;
+ struct manifest_desc *next;
+
+ list_for_each_entry_safe(descriptor, next, &intf->manifest_descs, links)
+ release_manifest_descriptor(descriptor);
+}
+
+static void release_cport_descriptors(struct list_head *head, u8 bundle_id)
+{
+ struct manifest_desc *desc, *tmp;
+ struct greybus_descriptor_cport *desc_cport;
+
+ list_for_each_entry_safe(desc, tmp, head, links) {
+ desc_cport = desc->data;
+
+ if (desc->type != GREYBUS_TYPE_CPORT)
+ continue;
+
+ if (desc_cport->bundle == bundle_id)
+ release_manifest_descriptor(desc);
+ }
+}
+
+static struct manifest_desc *get_next_bundle_desc(struct gb_interface *intf)
+{
+ struct manifest_desc *descriptor;
+ struct manifest_desc *next;
+
+ list_for_each_entry_safe(descriptor, next, &intf->manifest_descs, links)
+ if (descriptor->type == GREYBUS_TYPE_BUNDLE)
+ return descriptor;
+
+ return NULL;
+}
+
+/*
+ * Validate the given descriptor. Its reported size must fit within
+ * the number of bytes remaining, and it must have a recognized
+ * type. Check that the reported size is at least as big as what
+ * we expect to see. (It could be bigger, perhaps for a new version
+ * of the format.)
+ *
+ * Returns the (non-zero) number of bytes consumed by the descriptor,
+ * or a negative errno.
+ */
+static int identify_descriptor(struct gb_interface *intf,
+ struct greybus_descriptor *desc, size_t size)
+{
+ struct greybus_descriptor_header *desc_header = &desc->header;
+ struct manifest_desc *descriptor;
+ size_t desc_size;
+ size_t expected_size;
+
+ if (size < sizeof(*desc_header)) {
+ dev_err(&intf->dev, "manifest too small (%zu < %zu)\n",
+ size, sizeof(*desc_header));
+ return -EINVAL; /* Must at least have header */
+ }
+
+ desc_size = le16_to_cpu(desc_header->size);
+ if (desc_size > size) {
+ dev_err(&intf->dev, "descriptor too big (%zu > %zu)\n",
+ desc_size, size);
+ return -EINVAL;
+ }
+
+ /* Descriptor needs to at least have a header */
+ expected_size = sizeof(*desc_header);
+
+ switch (desc_header->type) {
+ case GREYBUS_TYPE_STRING:
+ expected_size += sizeof(struct greybus_descriptor_string);
+ expected_size += desc->string.length;
+
+ /* String descriptors are padded to 4 byte boundaries */
+ expected_size = ALIGN(expected_size, 4);
+ break;
+ case GREYBUS_TYPE_INTERFACE:
+ expected_size += sizeof(struct greybus_descriptor_interface);
+ break;
+ case GREYBUS_TYPE_BUNDLE:
+ expected_size += sizeof(struct greybus_descriptor_bundle);
+ break;
+ case GREYBUS_TYPE_CPORT:
+ expected_size += sizeof(struct greybus_descriptor_cport);
+ break;
+ case GREYBUS_TYPE_INVALID:
+ default:
+ dev_err(&intf->dev, "invalid descriptor type (%u)\n",
+ desc_header->type);
+ return -EINVAL;
+ }
+
+ if (desc_size < expected_size) {
+ dev_err(&intf->dev, "%s descriptor too small (%zu < %zu)\n",
+ get_descriptor_type_string(desc_header->type),
+ desc_size, expected_size);
+ return -EINVAL;
+ }
+
+ /* Descriptor bigger than what we expect */
+ if (desc_size > expected_size) {
+ dev_warn(&intf->dev, "%s descriptor size mismatch (want %zu got %zu)\n",
+ get_descriptor_type_string(desc_header->type),
+ expected_size, desc_size);
+ }
+
+ descriptor = kzalloc(sizeof(*descriptor), GFP_KERNEL);
+ if (!descriptor)
+ return -ENOMEM;
+
+ descriptor->size = desc_size;
+ descriptor->data = (char *)desc + sizeof(*desc_header);
+ descriptor->type = desc_header->type;
+ list_add_tail(&descriptor->links, &intf->manifest_descs);
+
+ /* desc_size is positive and is known to fit in a signed int */
+
+ return desc_size;
+}
+
+/*
+ * Find the string descriptor having the given id, validate it, and
+ * allocate a duplicate copy of it. The duplicate has an extra byte
+ * which guarantees the returned string is NUL-terminated.
+ *
+ * String index 0 is valid (it represents "no string"), and for
+ * that a null pointer is returned.
+ *
+ * Otherwise returns a pointer to a newly-allocated copy of the
+ * descriptor string, or an error-coded pointer on failure.
+ */
+static char *gb_string_get(struct gb_interface *intf, u8 string_id)
+{
+ struct greybus_descriptor_string *desc_string;
+ struct manifest_desc *descriptor;
+ bool found = false;
+ char *string;
+
+ /* A zero string id means no string (but no error) */
+ if (!string_id)
+ return NULL;
+
+ list_for_each_entry(descriptor, &intf->manifest_descs, links) {
+ if (descriptor->type != GREYBUS_TYPE_STRING)
+ continue;
+
+ desc_string = descriptor->data;
+ if (desc_string->id == string_id) {
+ found = true;
+ break;
+ }
+ }
+ if (!found)
+ return ERR_PTR(-ENOENT);
+
+ /* Allocate an extra byte so we can guarantee it's NUL-terminated */
+ string = kmemdup(&desc_string->string, desc_string->length + 1,
+ GFP_KERNEL);
+ if (!string)
+ return ERR_PTR(-ENOMEM);
+ string[desc_string->length] = '\0';
+
+ /* Ok we've used this string, so we're done with it */
+ release_manifest_descriptor(descriptor);
+
+ return string;
+}
+
+/*
+ * Find cport descriptors in the manifest associated with the given
+ * bundle, and set up data structures for the functions that use
+ * them. Returns the number of cports set up for the bundle, or 0
+ * if there is an error.
+ */
+static u32 gb_manifest_parse_cports(struct gb_bundle *bundle)
+{
+ struct gb_interface *intf = bundle->intf;
+ struct greybus_descriptor_cport *desc_cport;
+ struct manifest_desc *desc, *next, *tmp;
+ LIST_HEAD(list);
+ u8 bundle_id = bundle->id;
+ u16 cport_id;
+ u32 count = 0;
+ int i;
+
+ /* Set up all cport descriptors associated with this bundle */
+ list_for_each_entry_safe(desc, next, &intf->manifest_descs, links) {
+ if (desc->type != GREYBUS_TYPE_CPORT)
+ continue;
+
+ desc_cport = desc->data;
+ if (desc_cport->bundle != bundle_id)
+ continue;
+
+ cport_id = le16_to_cpu(desc_cport->id);
+ if (cport_id > CPORT_ID_MAX)
+ goto exit;
+
+ /* Nothing else should have its cport_id as control cport id */
+ if (cport_id == GB_CONTROL_CPORT_ID) {
+ dev_err(&bundle->dev, "invalid cport id found (%02u)\n",
+ cport_id);
+ goto exit;
+ }
+
+ /*
+ * Found one, move it to our temporary list after checking for
+ * duplicates.
+ */
+ list_for_each_entry(tmp, &list, links) {
+ desc_cport = tmp->data;
+ if (cport_id == le16_to_cpu(desc_cport->id)) {
+ dev_err(&bundle->dev,
+ "duplicate CPort %u found\n",
+ cport_id);
+ goto exit;
+ }
+ }
+ list_move_tail(&desc->links, &list);
+ count++;
+ }
+
+ if (!count)
+ return 0;
+
+ bundle->cport_desc = kcalloc(count, sizeof(*bundle->cport_desc),
+ GFP_KERNEL);
+ if (!bundle->cport_desc)
+ goto exit;
+
+ bundle->num_cports = count;
+
+ i = 0;
+ list_for_each_entry_safe(desc, next, &list, links) {
+ desc_cport = desc->data;
+ memcpy(&bundle->cport_desc[i++], desc_cport,
+ sizeof(*desc_cport));
+
+ /* Release the cport descriptor */
+ release_manifest_descriptor(desc);
+ }
+
+ return count;
+exit:
+ release_cport_descriptors(&list, bundle_id);
+ /*
+ * Free all cports for this bundle to avoid 'excess descriptors'
+ * warnings.
+ */
+ release_cport_descriptors(&intf->manifest_descs, bundle_id);
+
+ return 0; /* Error; count should also be 0 */
+}
+
+/*
+ * Find bundle descriptors in the manifest and set up their data
+ * structures. Returns the number of bundles set up for the
+ * given interface.
+ */
+static u32 gb_manifest_parse_bundles(struct gb_interface *intf)
+{
+ struct manifest_desc *desc;
+ struct gb_bundle *bundle;
+ struct gb_bundle *bundle_next;
+ u32 count = 0;
+ u8 bundle_id;
+ u8 class;
+
+ while ((desc = get_next_bundle_desc(intf))) {
+ struct greybus_descriptor_bundle *desc_bundle;
+
+ /* Found one. Set up its bundle structure*/
+ desc_bundle = desc->data;
+ bundle_id = desc_bundle->id;
+ class = desc_bundle->class;
+
+ /* Done with this bundle descriptor */
+ release_manifest_descriptor(desc);
+
+ /* Ignore any legacy control bundles */
+ if (bundle_id == GB_CONTROL_BUNDLE_ID) {
+ dev_dbg(&intf->dev, "%s - ignoring control bundle\n",
+ __func__);
+ release_cport_descriptors(&intf->manifest_descs,
+ bundle_id);
+ continue;
+ }
+
+ /* Nothing else should have its class set to control class */
+ if (class == GREYBUS_CLASS_CONTROL) {
+ dev_err(&intf->dev,
+ "bundle %u cannot use control class\n",
+ bundle_id);
+ goto cleanup;
+ }
+
+ bundle = gb_bundle_create(intf, bundle_id, class);
+ if (!bundle)
+ goto cleanup;
+
+ /*
+ * Now go set up this bundle's functions and cports.
+ *
+ * A 'bundle' represents a device in greybus. It may require
+ * multiple cports for its functioning. If we fail to setup any
+ * cport of a bundle, we better reject the complete bundle as
+ * the device may not be able to function properly then.
+ *
+ * But, failing to setup a cport of bundle X doesn't mean that
+ * the device corresponding to bundle Y will not work properly.
+ * Bundles should be treated as separate independent devices.
+ *
+ * While parsing manifest for an interface, treat bundles as
+ * separate entities and don't reject entire interface and its
+ * bundles on failing to initialize a cport. But make sure the
+ * bundle which needs the cport, gets destroyed properly.
+ */
+ if (!gb_manifest_parse_cports(bundle)) {
+ gb_bundle_destroy(bundle);
+ continue;
+ }
+
+ count++;
+ }
+
+ return count;
+cleanup:
+ /* An error occurred; undo any changes we've made */
+ list_for_each_entry_safe(bundle, bundle_next, &intf->bundles, links) {
+ gb_bundle_destroy(bundle);
+ count--;
+ }
+ return 0; /* Error; count should also be 0 */
+}
+
+static bool gb_manifest_parse_interface(struct gb_interface *intf,
+ struct manifest_desc *interface_desc)
+{
+ struct greybus_descriptor_interface *desc_intf = interface_desc->data;
+ struct gb_control *control = intf->control;
+ char *str;
+
+ /* Handle the strings first--they can fail */
+ str = gb_string_get(intf, desc_intf->vendor_stringid);
+ if (IS_ERR(str))
+ return false;
+ control->vendor_string = str;
+
+ str = gb_string_get(intf, desc_intf->product_stringid);
+ if (IS_ERR(str))
+ goto out_free_vendor_string;
+ control->product_string = str;
+
+ /* Assign feature flags communicated via manifest */
+ intf->features = desc_intf->features;
+
+ /* Release the interface descriptor, now that we're done with it */
+ release_manifest_descriptor(interface_desc);
+
+ /* An interface must have at least one bundle descriptor */
+ if (!gb_manifest_parse_bundles(intf)) {
+ dev_err(&intf->dev, "manifest bundle descriptors not valid\n");
+ goto out_err;
+ }
+
+ return true;
+out_err:
+ kfree(control->product_string);
+ control->product_string = NULL;
+out_free_vendor_string:
+ kfree(control->vendor_string);
+ control->vendor_string = NULL;
+
+ return false;
+}
+
+/*
+ * Parse a buffer containing an interface manifest.
+ *
+ * If we find anything wrong with the content/format of the buffer
+ * we reject it.
+ *
+ * The first requirement is that the manifest's version is
+ * one we can parse.
+ *
+ * We make an initial pass through the buffer and identify all of
+ * the descriptors it contains, keeping track for each its type
+ * and the location size of its data in the buffer.
+ *
+ * Next we scan the descriptors, looking for an interface descriptor;
+ * there must be exactly one of those. When found, we record the
+ * information it contains, and then remove that descriptor (and any
+ * string descriptors it refers to) from further consideration.
+ *
+ * After that we look for the interface's bundles--there must be at
+ * least one of those.
+ *
+ * Returns true if parsing was successful, false otherwise.
+ */
+bool gb_manifest_parse(struct gb_interface *intf, void *data, size_t size)
+{
+ struct greybus_manifest *manifest;
+ struct greybus_manifest_header *header;
+ struct greybus_descriptor *desc;
+ struct manifest_desc *descriptor;
+ struct manifest_desc *interface_desc = NULL;
+ u16 manifest_size;
+ u32 found = 0;
+ bool result;
+
+ /* Manifest descriptor list should be empty here */
+ if (WARN_ON(!list_empty(&intf->manifest_descs)))
+ return false;
+
+ /* we have to have at _least_ the manifest header */
+ if (size < sizeof(*header)) {
+ dev_err(&intf->dev, "short manifest (%zu < %zu)\n",
+ size, sizeof(*header));
+ return false;
+ }
+
+ /* Make sure the size is right */
+ manifest = data;
+ header = &manifest->header;
+ manifest_size = le16_to_cpu(header->size);
+ if (manifest_size != size) {
+ dev_err(&intf->dev, "manifest size mismatch (%zu != %u)\n",
+ size, manifest_size);
+ return false;
+ }
+
+ /* Validate major/minor number */
+ if (header->version_major > GREYBUS_VERSION_MAJOR) {
+ dev_err(&intf->dev, "manifest version too new (%u.%u > %u.%u)\n",
+ header->version_major, header->version_minor,
+ GREYBUS_VERSION_MAJOR, GREYBUS_VERSION_MINOR);
+ return false;
+ }
+
+ /* OK, find all the descriptors */
+ desc = manifest->descriptors;
+ size -= sizeof(*header);
+ while (size) {
+ int desc_size;
+
+ desc_size = identify_descriptor(intf, desc, size);
+ if (desc_size < 0) {
+ result = false;
+ goto out;
+ }
+ desc = (struct greybus_descriptor *)((char *)desc + desc_size);
+ size -= desc_size;
+ }
+
+ /* There must be a single interface descriptor */
+ list_for_each_entry(descriptor, &intf->manifest_descs, links) {
+ if (descriptor->type == GREYBUS_TYPE_INTERFACE)
+ if (!found++)
+ interface_desc = descriptor;
+ }
+ if (found != 1) {
+ dev_err(&intf->dev, "manifest must have 1 interface descriptor (%u found)\n",
+ found);
+ result = false;
+ goto out;
+ }
+
+ /* Parse the manifest, starting with the interface descriptor */
+ result = gb_manifest_parse_interface(intf, interface_desc);
+
+ /*
+ * We really should have no remaining descriptors, but we
+ * don't know what newer format manifests might leave.
+ */
+ if (result && !list_empty(&intf->manifest_descs))
+ dev_info(&intf->dev, "excess descriptors in interface manifest\n");
+out:
+ release_manifest_descriptors(intf);
+
+ return result;
+}
--- /dev/null
+++ b/drivers/greybus/manifest.h
@@ -0,0 +1,16 @@
+/*
+ * Greybus manifest parsing
+ *
+ * Copyright 2014 Google Inc.
+ * Copyright 2014 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#ifndef __MANIFEST_H
+#define __MANIFEST_H
+
+struct gb_interface;
+bool gb_manifest_parse(struct gb_interface *intf, void *data, size_t size);
+
+#endif /* __MANIFEST_H */
--- /dev/null
+++ b/drivers/greybus/module.c
@@ -0,0 +1,238 @@
+/*
+ * Greybus Module code
+ *
+ * Copyright 2016 Google Inc.
+ * Copyright 2016 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#include "greybus.h"
+#include "greybus_trace.h"
+
+
+static ssize_t eject_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct gb_module *module = to_gb_module(dev);
+ struct gb_interface *intf;
+ size_t i;
+ long val;
+ int ret;
+
+ ret = kstrtol(buf, 0, &val);
+ if (ret)
+ return ret;
+
+ if (!val)
+ return len;
+
+ for (i = 0; i < module->num_interfaces; ++i) {
+ intf = module->interfaces[i];
+
+ mutex_lock(&intf->mutex);
+ /* Set flag to prevent concurrent activation. */
+ intf->ejected = true;
+ gb_interface_disable(intf);
+ gb_interface_deactivate(intf);
+ mutex_unlock(&intf->mutex);
+ }
+
+ /* Tell the SVC to eject the primary interface. */
+ ret = gb_svc_intf_eject(module->hd->svc, module->module_id);
+ if (ret)
+ return ret;
+
+ return len;
+}
+static DEVICE_ATTR_WO(eject);
+
+static ssize_t module_id_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct gb_module *module = to_gb_module(dev);
+
+ return sprintf(buf, "%u\n", module->module_id);
+}
+static DEVICE_ATTR_RO(module_id);
+
+static ssize_t num_interfaces_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct gb_module *module = to_gb_module(dev);
+
+ return sprintf(buf, "%zu\n", module->num_interfaces);
+}
+static DEVICE_ATTR_RO(num_interfaces);
+
+static struct attribute *module_attrs[] = {
+ &dev_attr_eject.attr,
+ &dev_attr_module_id.attr,
+ &dev_attr_num_interfaces.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(module);
+
+static void gb_module_release(struct device *dev)
+{
+ struct gb_module *module = to_gb_module(dev);
+
+ trace_gb_module_release(module);
+
+ kfree(module);
+}
+
+struct device_type greybus_module_type = {
+ .name = "greybus_module",
+ .release = gb_module_release,
+};
+
+struct gb_module *gb_module_create(struct gb_host_device *hd, u8 module_id,
+ size_t num_interfaces)
+{
+ struct gb_interface *intf;
+ struct gb_module *module;
+ int i;
+
+ module = kzalloc(sizeof(*module) + num_interfaces * sizeof(intf),
+ GFP_KERNEL);
+ if (!module)
+ return NULL;
+
+ module->hd = hd;
+ module->module_id = module_id;
+ module->num_interfaces = num_interfaces;
+
+ module->dev.parent = &hd->dev;
+ module->dev.bus = &greybus_bus_type;
+ module->dev.type = &greybus_module_type;
+ module->dev.groups = module_groups;
+ module->dev.dma_mask = hd->dev.dma_mask;
+ device_initialize(&module->dev);
+ dev_set_name(&module->dev, "%d-%u", hd->bus_id, module_id);
+
+ trace_gb_module_create(module);
+
+ for (i = 0; i < num_interfaces; ++i) {
+ intf = gb_interface_create(module, module_id + i);
+ if (!intf) {
+ dev_err(&module->dev, "failed to create interface %u\n",
+ module_id + i);
+ goto err_put_interfaces;
+ }
+ module->interfaces[i] = intf;
+ }
+
+ return module;
+
+err_put_interfaces:
+ for (--i; i > 0; --i)
+ gb_interface_put(module->interfaces[i]);
+
+ put_device(&module->dev);
+
+ return NULL;
+}
+
+/*
+ * Register and enable an interface after first attempting to activate it.
+ */
+static void gb_module_register_interface(struct gb_interface *intf)
+{
+ struct gb_module *module = intf->module;
+ u8 intf_id = intf->interface_id;
+ int ret;
+
+ mutex_lock(&intf->mutex);
+
+ ret = gb_interface_activate(intf);
+ if (ret) {
+ if (intf->type != GB_INTERFACE_TYPE_DUMMY) {
+ dev_err(&module->dev,
+ "failed to activate interface %u: %d\n",
+ intf_id, ret);
+ }
+
+ gb_interface_add(intf);
+ goto err_unlock;
+ }
+
+ ret = gb_interface_add(intf);
+ if (ret)
+ goto err_interface_deactivate;
+
+ ret = gb_interface_enable(intf);
+ if (ret) {
+ dev_err(&module->dev, "failed to enable interface %u: %d\n",
+ intf_id, ret);
+ goto err_interface_deactivate;
+ }
+
+ mutex_unlock(&intf->mutex);
+
+ return;
+
+err_interface_deactivate:
+ gb_interface_deactivate(intf);
+err_unlock:
+ mutex_unlock(&intf->mutex);
+}
+
+static void gb_module_deregister_interface(struct gb_interface *intf)
+{
+ /* Mark as disconnected to prevent I/O during disable. */
+ if (intf->module->disconnected)
+ intf->disconnected = true;
+
+ mutex_lock(&intf->mutex);
+ intf->removed = true;
+ gb_interface_disable(intf);
+ gb_interface_deactivate(intf);
+ mutex_unlock(&intf->mutex);
+
+ gb_interface_del(intf);
+}
+
+/* Register a module and its interfaces. */
+int gb_module_add(struct gb_module *module)
+{
+ size_t i;
+ int ret;
+
+ ret = device_add(&module->dev);
+ if (ret) {
+ dev_err(&module->dev, "failed to register module: %d\n", ret);
+ return ret;
+ }
+
+ trace_gb_module_add(module);
+
+ for (i = 0; i < module->num_interfaces; ++i)
+ gb_module_register_interface(module->interfaces[i]);
+
+ return 0;
+}
+
+/* Deregister a module and its interfaces. */
+void gb_module_del(struct gb_module *module)
+{
+ size_t i;
+
+ for (i = 0; i < module->num_interfaces; ++i)
+ gb_module_deregister_interface(module->interfaces[i]);
+
+ trace_gb_module_del(module);
+
+ device_del(&module->dev);
+}
+
+void gb_module_put(struct gb_module *module)
+{
+ size_t i;
+
+ for (i = 0; i < module->num_interfaces; ++i)
+ gb_interface_put(module->interfaces[i]);
+
+ put_device(&module->dev);
+}
--- /dev/null
+++ b/drivers/greybus/module.h
@@ -0,0 +1,34 @@
+/*
+ * Greybus Module code
+ *
+ * Copyright 2016 Google Inc.
+ * Copyright 2016 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#ifndef __MODULE_H
+#define __MODULE_H
+
+struct gb_module {
+ struct device dev;
+ struct gb_host_device *hd;
+
+ struct list_head hd_node;
+
+ u8 module_id;
+ size_t num_interfaces;
+
+ bool disconnected;
+
+ struct gb_interface *interfaces[0];
+};
+#define to_gb_module(d) container_of(d, struct gb_module, dev)
+
+struct gb_module *gb_module_create(struct gb_host_device *hd, u8 module_id,
+ size_t num_interfaces);
+int gb_module_add(struct gb_module *module);
+void gb_module_del(struct gb_module *module);
+void gb_module_put(struct gb_module *module);
+
+#endif /* __MODULE_H */
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