320 lines
7.0 KiB
C
320 lines
7.0 KiB
C
/*
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* Greybus bundles
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*
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* Copyright 2014-2015 Google Inc.
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* Copyright 2014-2015 Linaro Ltd.
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*
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* Released under the GPLv2 only.
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*/
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#include "greybus.h"
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static void gb_bundle_connections_exit(struct gb_bundle *bundle);
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static int gb_bundle_connections_init(struct gb_bundle *bundle);
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static ssize_t device_id_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct gb_bundle *bundle = to_gb_bundle(dev);
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return sprintf(buf, "%d\n", bundle->device_id);
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}
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static DEVICE_ATTR_RO(device_id);
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static ssize_t class_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct gb_bundle *bundle = to_gb_bundle(dev);
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return sprintf(buf, "%d\n", bundle->class);
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}
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static DEVICE_ATTR_RO(class);
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static ssize_t state_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct gb_bundle *bundle = to_gb_bundle(dev);
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if (bundle->state == NULL)
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return sprintf(buf, "\n");
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return sprintf(buf, "%s\n", bundle->state);
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}
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static ssize_t state_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t size)
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{
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struct gb_bundle *bundle = to_gb_bundle(dev);
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kfree(bundle->state);
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bundle->state = kstrdup(buf, GFP_KERNEL);
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if (!bundle->state)
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return -ENOMEM;
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/* Tell userspace that the file contents changed */
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sysfs_notify(&bundle->dev.kobj, NULL, "state");
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return size;
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}
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static DEVICE_ATTR_RW(state);
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static struct attribute *bundle_attrs[] = {
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&dev_attr_device_id.attr,
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&dev_attr_class.attr,
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&dev_attr_state.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(bundle);
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static void gb_bundle_release(struct device *dev)
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{
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struct gb_bundle *bundle = to_gb_bundle(dev);
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kfree(bundle->state);
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kfree(bundle);
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}
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struct device_type greybus_bundle_type = {
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.name = "greybus_bundle",
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.release = gb_bundle_release,
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};
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static int gb_bundle_match_one_id(struct gb_bundle *bundle,
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const struct greybus_bundle_id *id)
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{
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if ((id->match_flags & GREYBUS_ID_MATCH_VENDOR) &&
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(id->vendor != bundle->intf->vendor))
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return 0;
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if ((id->match_flags & GREYBUS_ID_MATCH_PRODUCT) &&
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(id->product != bundle->intf->product))
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return 0;
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if ((id->match_flags & GREYBUS_ID_MATCH_SERIAL) &&
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(id->unique_id != bundle->intf->unique_id))
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return 0;
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if ((id->match_flags & GREYBUS_ID_MATCH_CLASS) &&
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(id->class != bundle->class))
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return 0;
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return 1;
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}
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const struct greybus_bundle_id *
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gb_bundle_match_id(struct gb_bundle *bundle,
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const struct greybus_bundle_id *id)
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{
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if (id == NULL)
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return NULL;
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for (; id->vendor || id->product || id->unique_id || id->class ||
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id->driver_info; id++) {
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if (gb_bundle_match_one_id(bundle, id))
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return id;
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}
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return NULL;
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}
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/* XXX This could be per-host device or per-module */
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static DEFINE_SPINLOCK(gb_bundles_lock);
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static int __bundle_bind_protocols(struct device *dev, void *data)
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{
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struct gb_bundle *bundle;
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struct gb_connection *connection;
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if (!is_gb_bundle(dev))
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return 0;
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bundle = to_gb_bundle(dev);
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list_for_each_entry(connection, &bundle->connections, bundle_links) {
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gb_connection_bind_protocol(connection);
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}
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return 0;
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}
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/*
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* Walk all bundles in the system, and see if any connections are not bound to a
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* specific prototcol. If they are not, then try to find one for it and bind it
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* to it.
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*
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* This is called after registering a new protocol.
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*/
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void gb_bundle_bind_protocols(void)
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{
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bus_for_each_dev(&greybus_bus_type, NULL, NULL,
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__bundle_bind_protocols);
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}
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/*
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* Create a gb_bundle structure to represent a discovered
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* bundle. Returns a pointer to the new bundle or a null
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* pointer if a failure occurs due to memory exhaustion.
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*/
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struct gb_bundle *gb_bundle_create(struct gb_interface *intf, u8 bundle_id,
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u8 class)
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{
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struct gb_bundle *bundle;
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int retval;
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/*
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* Reject any attempt to reuse a bundle id. We initialize
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* these serially, so there's no need to worry about keeping
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* the interface bundle list locked here.
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*/
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if (gb_bundle_find(intf, bundle_id)) {
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pr_err("duplicate bundle id 0x%02hhx\n", bundle_id);
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return NULL;
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}
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bundle = kzalloc(sizeof(*bundle), GFP_KERNEL);
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if (!bundle)
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return NULL;
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bundle->intf = intf;
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bundle->id = bundle_id;
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bundle->class = class;
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INIT_LIST_HEAD(&bundle->connections);
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/* Invalid device id to start with */
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bundle->device_id = GB_DEVICE_ID_BAD;
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/* Build up the bundle device structures and register it with the
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* driver core */
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bundle->dev.parent = &intf->dev;
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bundle->dev.bus = &greybus_bus_type;
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bundle->dev.type = &greybus_bundle_type;
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bundle->dev.groups = bundle_groups;
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device_initialize(&bundle->dev);
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dev_set_name(&bundle->dev, "%s:%d", dev_name(&intf->dev), bundle_id);
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retval = device_add(&bundle->dev);
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if (retval) {
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pr_err("failed to add bundle device for id 0x%02hhx\n",
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bundle_id);
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put_device(&bundle->dev);
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kfree(bundle);
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return NULL;
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}
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spin_lock_irq(&gb_bundles_lock);
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list_add(&bundle->links, &intf->bundles);
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spin_unlock_irq(&gb_bundles_lock);
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return bundle;
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}
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/*
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* Tear down a previously set up bundle.
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*/
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void gb_bundle_destroy(struct gb_interface *intf)
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{
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LIST_HEAD(list);
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struct gb_bundle *bundle;
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struct gb_bundle *temp;
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if (WARN_ON(!intf))
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return;
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spin_lock_irq(&gb_bundles_lock);
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list_splice_init(&intf->bundles, &list);
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spin_unlock_irq(&gb_bundles_lock);
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list_for_each_entry_safe(bundle, temp, &list, links) {
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list_del(&bundle->links);
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gb_bundle_connections_exit(bundle);
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device_unregister(&bundle->dev);
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}
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}
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int gb_bundle_init(struct gb_bundle *bundle, u8 device_id)
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{
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struct gb_interface *intf = bundle->intf;
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int ret;
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bundle->device_id = device_id;
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ret = svc_set_route_send(bundle, intf->hd);
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if (ret) {
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dev_err(intf->hd->parent, "failed to set route (%d)\n", ret);
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return ret;
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}
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ret = gb_bundle_connections_init(bundle);
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if (ret) {
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dev_err(intf->hd->parent, "interface bundle init error %d\n",
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ret);
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/* XXX clear route */
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return ret;
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}
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return 0;
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}
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int gb_bundles_init(struct gb_interface *intf, u8 device_id)
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{
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struct gb_bundle *bundle;
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int ret = 0;
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list_for_each_entry(bundle, &intf->bundles, links) {
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ret = gb_bundle_init(bundle, device_id);
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if (ret) {
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dev_err(intf->hd->parent,
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"Failed to initialize bundle %hhu\n",
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bundle->id);
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break;
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}
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}
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return ret;
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}
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struct gb_bundle *gb_bundle_find(struct gb_interface *intf, u8 bundle_id)
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{
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struct gb_bundle *bundle;
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spin_lock_irq(&gb_bundles_lock);
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list_for_each_entry(bundle, &intf->bundles, links)
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if (bundle->id == bundle_id)
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goto found;
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bundle = NULL;
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found:
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spin_unlock_irq(&gb_bundles_lock);
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return bundle;
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}
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static int gb_bundle_connections_init(struct gb_bundle *bundle)
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{
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struct gb_connection *connection;
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int ret = 0;
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list_for_each_entry(connection, &bundle->connections, bundle_links) {
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ret = gb_connection_init(connection);
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if (ret)
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break;
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}
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return ret;
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}
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static void gb_bundle_connections_exit(struct gb_bundle *bundle)
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{
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struct gb_connection *connection;
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struct gb_connection *next;
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list_for_each_entry_safe(connection, next, &bundle->connections,
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bundle_links) {
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gb_connection_exit(connection);
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gb_connection_destroy(connection);
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}
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}
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