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1// SPDX-License-Identifier: GPL-2.02/*3 * Greybus bundles4 *5 * Copyright 2014-2015 Google Inc.6 * Copyright 2014-2015 Linaro Ltd.7 */8 9#include <linux/greybus.h>10#include "greybus_trace.h"11 12static ssize_t bundle_class_show(struct device *dev,13 struct device_attribute *attr, char *buf)14{15 struct gb_bundle *bundle = to_gb_bundle(dev);16 17 return sprintf(buf, "0x%02x\n", bundle->class);18}19static DEVICE_ATTR_RO(bundle_class);20 21static ssize_t bundle_id_show(struct device *dev,22 struct device_attribute *attr, char *buf)23{24 struct gb_bundle *bundle = to_gb_bundle(dev);25 26 return sprintf(buf, "%u\n", bundle->id);27}28static DEVICE_ATTR_RO(bundle_id);29 30static ssize_t state_show(struct device *dev, struct device_attribute *attr,31 char *buf)32{33 struct gb_bundle *bundle = to_gb_bundle(dev);34 35 if (!bundle->state)36 return sprintf(buf, "\n");37 38 return sprintf(buf, "%s\n", bundle->state);39}40 41static ssize_t state_store(struct device *dev, struct device_attribute *attr,42 const char *buf, size_t size)43{44 struct gb_bundle *bundle = to_gb_bundle(dev);45 46 kfree(bundle->state);47 bundle->state = kstrdup(buf, GFP_KERNEL);48 if (!bundle->state)49 return -ENOMEM;50 51 /* Tell userspace that the file contents changed */52 sysfs_notify(&bundle->dev.kobj, NULL, "state");53 54 return size;55}56static DEVICE_ATTR_RW(state);57 58static struct attribute *bundle_attrs[] = {59 &dev_attr_bundle_class.attr,60 &dev_attr_bundle_id.attr,61 &dev_attr_state.attr,62 NULL,63};64 65ATTRIBUTE_GROUPS(bundle);66 67static struct gb_bundle *gb_bundle_find(struct gb_interface *intf,68 u8 bundle_id)69{70 struct gb_bundle *bundle;71 72 list_for_each_entry(bundle, &intf->bundles, links) {73 if (bundle->id == bundle_id)74 return bundle;75 }76 77 return NULL;78}79 80static void gb_bundle_release(struct device *dev)81{82 struct gb_bundle *bundle = to_gb_bundle(dev);83 84 trace_gb_bundle_release(bundle);85 86 kfree(bundle->state);87 kfree(bundle->cport_desc);88 kfree(bundle);89}90 91#ifdef CONFIG_PM92static void gb_bundle_disable_all_connections(struct gb_bundle *bundle)93{94 struct gb_connection *connection;95 96 list_for_each_entry(connection, &bundle->connections, bundle_links)97 gb_connection_disable(connection);98}99 100static void gb_bundle_enable_all_connections(struct gb_bundle *bundle)101{102 struct gb_connection *connection;103 104 list_for_each_entry(connection, &bundle->connections, bundle_links)105 gb_connection_enable(connection);106}107 108static int gb_bundle_suspend(struct device *dev)109{110 struct gb_bundle *bundle = to_gb_bundle(dev);111 const struct dev_pm_ops *pm = dev->driver->pm;112 int ret;113 114 if (pm && pm->runtime_suspend) {115 ret = pm->runtime_suspend(&bundle->dev);116 if (ret)117 return ret;118 } else {119 gb_bundle_disable_all_connections(bundle);120 }121 122 ret = gb_control_bundle_suspend(bundle->intf->control, bundle->id);123 if (ret) {124 if (pm && pm->runtime_resume)125 ret = pm->runtime_resume(dev);126 else127 gb_bundle_enable_all_connections(bundle);128 129 return ret;130 }131 132 return 0;133}134 135static int gb_bundle_resume(struct device *dev)136{137 struct gb_bundle *bundle = to_gb_bundle(dev);138 const struct dev_pm_ops *pm = dev->driver->pm;139 int ret;140 141 ret = gb_control_bundle_resume(bundle->intf->control, bundle->id);142 if (ret)143 return ret;144 145 if (pm && pm->runtime_resume) {146 ret = pm->runtime_resume(dev);147 if (ret)148 return ret;149 } else {150 gb_bundle_enable_all_connections(bundle);151 }152 153 return 0;154}155 156static int gb_bundle_idle(struct device *dev)157{158 pm_runtime_mark_last_busy(dev);159 pm_request_autosuspend(dev);160 161 return 0;162}163#endif164 165static const struct dev_pm_ops gb_bundle_pm_ops = {166 SET_RUNTIME_PM_OPS(gb_bundle_suspend, gb_bundle_resume, gb_bundle_idle)167};168 169const struct device_type greybus_bundle_type = {170 .name = "greybus_bundle",171 .release = gb_bundle_release,172 .pm = &gb_bundle_pm_ops,173};174 175/*176 * Create a gb_bundle structure to represent a discovered177 * bundle. Returns a pointer to the new bundle or a null178 * pointer if a failure occurs due to memory exhaustion.179 */180struct gb_bundle *gb_bundle_create(struct gb_interface *intf, u8 bundle_id,181 u8 class)182{183 struct gb_bundle *bundle;184 185 if (bundle_id == BUNDLE_ID_NONE) {186 dev_err(&intf->dev, "can't use bundle id %u\n", bundle_id);187 return NULL;188 }189 190 /*191 * Reject any attempt to reuse a bundle id. We initialize192 * these serially, so there's no need to worry about keeping193 * the interface bundle list locked here.194 */195 if (gb_bundle_find(intf, bundle_id)) {196 dev_err(&intf->dev, "duplicate bundle id %u\n", bundle_id);197 return NULL;198 }199 200 bundle = kzalloc(sizeof(*bundle), GFP_KERNEL);201 if (!bundle)202 return NULL;203 204 bundle->intf = intf;205 bundle->id = bundle_id;206 bundle->class = class;207 INIT_LIST_HEAD(&bundle->connections);208 209 bundle->dev.parent = &intf->dev;210 bundle->dev.bus = &greybus_bus_type;211 bundle->dev.type = &greybus_bundle_type;212 bundle->dev.groups = bundle_groups;213 bundle->dev.dma_mask = intf->dev.dma_mask;214 device_initialize(&bundle->dev);215 dev_set_name(&bundle->dev, "%s.%d", dev_name(&intf->dev), bundle_id);216 217 list_add(&bundle->links, &intf->bundles);218 219 trace_gb_bundle_create(bundle);220 221 return bundle;222}223 224int gb_bundle_add(struct gb_bundle *bundle)225{226 int ret;227 228 ret = device_add(&bundle->dev);229 if (ret) {230 dev_err(&bundle->dev, "failed to register bundle: %d\n", ret);231 return ret;232 }233 234 trace_gb_bundle_add(bundle);235 236 return 0;237}238 239/*240 * Tear down a previously set up bundle.241 */242void gb_bundle_destroy(struct gb_bundle *bundle)243{244 trace_gb_bundle_destroy(bundle);245 246 if (device_is_registered(&bundle->dev))247 device_del(&bundle->dev);248 249 list_del(&bundle->links);250 251 put_device(&bundle->dev);252}253