// 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_PMstatic 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)}; const 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_obj(*bundle);	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);}