253 lines
5.4 KiB
C
253 lines
5.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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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#include <linux/greybus.h>
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#include "greybus_trace.h"
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static ssize_t bundle_class_show(struct device *dev,
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struct device_attribute *attr, 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, "0x%02x\n", bundle->class);
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}
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static DEVICE_ATTR_RO(bundle_class);
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static ssize_t bundle_id_show(struct device *dev,
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struct device_attribute *attr, 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, "%u\n", bundle->id);
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}
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static DEVICE_ATTR_RO(bundle_id);
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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)
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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_bundle_class.attr,
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&dev_attr_bundle_id.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 struct gb_bundle *gb_bundle_find(struct gb_interface *intf,
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u8 bundle_id)
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{
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struct gb_bundle *bundle;
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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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return bundle;
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}
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return NULL;
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}
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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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trace_gb_bundle_release(bundle);
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kfree(bundle->state);
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kfree(bundle->cport_desc);
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kfree(bundle);
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}
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#ifdef CONFIG_PM
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static void gb_bundle_disable_all_connections(struct gb_bundle *bundle)
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{
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struct gb_connection *connection;
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list_for_each_entry(connection, &bundle->connections, bundle_links)
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gb_connection_disable(connection);
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}
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static void gb_bundle_enable_all_connections(struct gb_bundle *bundle)
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{
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struct gb_connection *connection;
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list_for_each_entry(connection, &bundle->connections, bundle_links)
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gb_connection_enable(connection);
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}
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static int gb_bundle_suspend(struct device *dev)
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{
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struct gb_bundle *bundle = to_gb_bundle(dev);
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const struct dev_pm_ops *pm = dev->driver->pm;
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int ret;
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if (pm && pm->runtime_suspend) {
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ret = pm->runtime_suspend(&bundle->dev);
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if (ret)
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return ret;
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} else {
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gb_bundle_disable_all_connections(bundle);
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}
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ret = gb_control_bundle_suspend(bundle->intf->control, bundle->id);
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if (ret) {
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if (pm && pm->runtime_resume)
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ret = pm->runtime_resume(dev);
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else
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gb_bundle_enable_all_connections(bundle);
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return ret;
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}
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return 0;
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}
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static int gb_bundle_resume(struct device *dev)
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{
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struct gb_bundle *bundle = to_gb_bundle(dev);
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const struct dev_pm_ops *pm = dev->driver->pm;
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int ret;
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ret = gb_control_bundle_resume(bundle->intf->control, bundle->id);
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if (ret)
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return ret;
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if (pm && pm->runtime_resume) {
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ret = pm->runtime_resume(dev);
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if (ret)
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return ret;
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} else {
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gb_bundle_enable_all_connections(bundle);
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}
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return 0;
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}
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static int gb_bundle_idle(struct device *dev)
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{
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pm_runtime_mark_last_busy(dev);
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pm_request_autosuspend(dev);
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return 0;
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}
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#endif
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static const struct dev_pm_ops gb_bundle_pm_ops = {
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SET_RUNTIME_PM_OPS(gb_bundle_suspend, gb_bundle_resume, gb_bundle_idle)
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};
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const 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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.pm = &gb_bundle_pm_ops,
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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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if (bundle_id == BUNDLE_ID_NONE) {
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dev_err(&intf->dev, "can't use bundle id %u\n", bundle_id);
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return NULL;
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}
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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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dev_err(&intf->dev, "duplicate bundle id %u\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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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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bundle->dev.dma_mask = intf->dev.dma_mask;
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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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list_add(&bundle->links, &intf->bundles);
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trace_gb_bundle_create(bundle);
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return bundle;
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}
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int gb_bundle_add(struct gb_bundle *bundle)
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{
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int ret;
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ret = device_add(&bundle->dev);
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if (ret) {
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dev_err(&bundle->dev, "failed to register bundle: %d\n", ret);
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return ret;
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}
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trace_gb_bundle_add(bundle);
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return 0;
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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_bundle *bundle)
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{
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trace_gb_bundle_destroy(bundle);
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if (device_is_registered(&bundle->dev))
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device_del(&bundle->dev);
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list_del(&bundle->links);
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put_device(&bundle->dev);
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}
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