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Commit | Line | Data |
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eb50fd3a | 1 | // SPDX-License-Identifier: GPL-2.0 |
8c12cde3 | 2 | /* |
1db0a5ff | 3 | * Greybus bundles |
8c12cde3 | 4 | * |
75052a55 GKH |
5 | * Copyright 2014-2015 Google Inc. |
6 | * Copyright 2014-2015 Linaro Ltd. | |
8c12cde3 AE |
7 | */ |
8 | ||
ec0ad868 | 9 | #include <linux/greybus.h> |
4f9c5c0b | 10 | #include "greybus_trace.h" |
8c12cde3 | 11 | |
4396c00b JH |
12 | static ssize_t bundle_class_show(struct device *dev, |
13 | struct device_attribute *attr, char *buf) | |
9f5f30e7 VK |
14 | { |
15 | struct gb_bundle *bundle = to_gb_bundle(dev); | |
16 | ||
2b14daba | 17 | return sprintf(buf, "0x%02x\n", bundle->class); |
9f5f30e7 | 18 | } |
4396c00b | 19 | static DEVICE_ATTR_RO(bundle_class); |
9f5f30e7 | 20 | |
a97015c9 JH |
21 | static 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 | } | |
28 | static DEVICE_ATTR_RO(bundle_id); | |
29 | ||
75052a55 GKH |
30 | static 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 | ||
180a41bf | 35 | if (!bundle->state) |
75052a55 GKH |
36 | return sprintf(buf, "\n"); |
37 | ||
38 | return sprintf(buf, "%s\n", bundle->state); | |
39 | } | |
40 | ||
41 | static 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); | |
22fd2a8a | 47 | bundle->state = kstrdup(buf, GFP_KERNEL); |
75052a55 GKH |
48 | if (!bundle->state) |
49 | return -ENOMEM; | |
50 | ||
75052a55 GKH |
51 | /* Tell userspace that the file contents changed */ |
52 | sysfs_notify(&bundle->dev.kobj, NULL, "state"); | |
53 | ||
54 | return size; | |
55 | } | |
56 | static DEVICE_ATTR_RW(state); | |
57 | ||
1db0a5ff | 58 | static struct attribute *bundle_attrs[] = { |
4396c00b | 59 | &dev_attr_bundle_class.attr, |
a97015c9 | 60 | &dev_attr_bundle_id.attr, |
75052a55 | 61 | &dev_attr_state.attr, |
f0f61b90 GKH |
62 | NULL, |
63 | }; | |
64 | ||
1db0a5ff | 65 | ATTRIBUTE_GROUPS(bundle); |
f0f61b90 | 66 | |
1db1b243 | 67 | static struct gb_bundle *gb_bundle_find(struct gb_interface *intf, |
b7417e3c | 68 | u8 bundle_id) |
1db1b243 JH |
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 | ||
1db0a5ff | 80 | static void gb_bundle_release(struct device *dev) |
f0f61b90 | 81 | { |
1db0a5ff | 82 | struct gb_bundle *bundle = to_gb_bundle(dev); |
f0f61b90 | 83 | |
4f9c5c0b AE |
84 | trace_gb_bundle_release(bundle); |
85 | ||
75052a55 | 86 | kfree(bundle->state); |
98fdf5a0 | 87 | kfree(bundle->cport_desc); |
1db0a5ff | 88 | kfree(bundle); |
f0f61b90 GKH |
89 | } |
90 | ||
948c6227 | 91 | #ifdef CONFIG_PM |
61e13db9 DL |
92 | static 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 | ||
100 | static 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 | ||
108 | static 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 | ||
135 | static 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 | ||
156 | static 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 | ||
165 | static 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 | ||
1db0a5ff GKH |
169 | struct device_type greybus_bundle_type = { |
170 | .name = "greybus_bundle", | |
171 | .release = gb_bundle_release, | |
61e13db9 | 172 | .pm = &gb_bundle_pm_ops, |
f0f61b90 GKH |
173 | }; |
174 | ||
8c12cde3 | 175 | /* |
1db0a5ff GKH |
176 | * Create a gb_bundle structure to represent a discovered |
177 | * bundle. Returns a pointer to the new bundle or a null | |
8c12cde3 AE |
178 | * pointer if a failure occurs due to memory exhaustion. |
179 | */ | |
7c183f70 | 180 | struct gb_bundle *gb_bundle_create(struct gb_interface *intf, u8 bundle_id, |
88e6d37c | 181 | u8 class) |
8c12cde3 | 182 | { |
1db0a5ff | 183 | struct gb_bundle *bundle; |
8c12cde3 | 184 | |
76639ef5 AE |
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 | ||
8267616b AE |
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)) { | |
a234792d | 196 | dev_err(&intf->dev, "duplicate bundle id %u\n", bundle_id); |
8267616b AE |
197 | return NULL; |
198 | } | |
199 | ||
1db0a5ff GKH |
200 | bundle = kzalloc(sizeof(*bundle), GFP_KERNEL); |
201 | if (!bundle) | |
8c12cde3 AE |
202 | return NULL; |
203 | ||
4ab9b3c2 | 204 | bundle->intf = intf; |
7c183f70 | 205 | bundle->id = bundle_id; |
88e6d37c | 206 | bundle->class = class; |
1db0a5ff | 207 | INIT_LIST_HEAD(&bundle->connections); |
8c12cde3 | 208 | |
4ab9b3c2 | 209 | bundle->dev.parent = &intf->dev; |
1db0a5ff GKH |
210 | bundle->dev.bus = &greybus_bus_type; |
211 | bundle->dev.type = &greybus_bundle_type; | |
212 | bundle->dev.groups = bundle_groups; | |
dc0f0285 | 213 | bundle->dev.dma_mask = intf->dev.dma_mask; |
1db0a5ff | 214 | device_initialize(&bundle->dev); |
f0172c70 | 215 | dev_set_name(&bundle->dev, "%s.%d", dev_name(&intf->dev), bundle_id); |
1db0a5ff | 216 | |
928f2abd | 217 | list_add(&bundle->links, &intf->bundles); |
8c12cde3 | 218 | |
4f9c5c0b AE |
219 | trace_gb_bundle_create(bundle); |
220 | ||
1db0a5ff | 221 | return bundle; |
8c12cde3 AE |
222 | } |
223 | ||
a7e36d0e JH |
224 | int 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 | ||
4f9c5c0b AE |
234 | trace_gb_bundle_add(bundle); |
235 | ||
a7e36d0e JH |
236 | return 0; |
237 | } | |
238 | ||
8c12cde3 | 239 | /* |
1db0a5ff | 240 | * Tear down a previously set up bundle. |
8c12cde3 | 241 | */ |
fe53b45c | 242 | void gb_bundle_destroy(struct gb_bundle *bundle) |
8c12cde3 | 243 | { |
4f9c5c0b AE |
244 | trace_gb_bundle_destroy(bundle); |
245 | ||
a7e36d0e JH |
246 | if (device_is_registered(&bundle->dev)) |
247 | device_del(&bundle->dev); | |
1a4c013a | 248 | |
a7e36d0e JH |
249 | list_del(&bundle->links); |
250 | ||
251 | put_device(&bundle->dev); | |
252 | } |