--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Greybus bundles
+ *
+ * Copyright 2014-2015 Google Inc.
+ * Copyright 2014-2015 Linaro Ltd.
+ */
+
+#include <linux/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)
+ 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);
+}
projects / linux-2.6-microblaze.git / blobdiff