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- // 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);
- }
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