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252 lines · 5.4 KiB

1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Greybus bundles
4 *
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_PM
92static 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 else
127 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#endif
164
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 discovered
177 * bundle. Returns a pointer to the new bundle or a null
178 * 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 initialize
192 * these serially, so there's no need to worry about keeping
193 * 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_obj(*bundle);
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}