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eb50fd3a | 1 | // SPDX-License-Identifier: GPL-2.0 |
b15d97d7 JH |
2 | /* |
3 | * Greybus Module code | |
4 | * | |
5 | * Copyright 2016 Google Inc. | |
6 | * Copyright 2016 Linaro Ltd. | |
b15d97d7 JH |
7 | */ |
8 | ||
ec0ad868 | 9 | #include <linux/greybus.h> |
5451ea0e | 10 | #include "greybus_trace.h" |
b15d97d7 | 11 | |
36602a29 | 12 | static ssize_t eject_store(struct device *dev, |
8478c35a CS |
13 | struct device_attribute *attr, |
14 | const char *buf, size_t len) | |
36602a29 JH |
15 | { |
16 | struct gb_module *module = to_gb_module(dev); | |
17 | struct gb_interface *intf; | |
18 | size_t i; | |
19 | long val; | |
20 | int ret; | |
21 | ||
22 | ret = kstrtol(buf, 0, &val); | |
23 | if (ret) | |
24 | return ret; | |
25 | ||
26 | if (!val) | |
27 | return len; | |
28 | ||
29 | for (i = 0; i < module->num_interfaces; ++i) { | |
30 | intf = module->interfaces[i]; | |
31 | ||
32 | mutex_lock(&intf->mutex); | |
33 | /* Set flag to prevent concurrent activation. */ | |
34 | intf->ejected = true; | |
35 | gb_interface_disable(intf); | |
36 | gb_interface_deactivate(intf); | |
37 | mutex_unlock(&intf->mutex); | |
38 | } | |
39 | ||
40 | /* Tell the SVC to eject the primary interface. */ | |
41 | ret = gb_svc_intf_eject(module->hd->svc, module->module_id); | |
42 | if (ret) | |
43 | return ret; | |
44 | ||
45 | return len; | |
46 | } | |
47 | static DEVICE_ATTR_WO(eject); | |
48 | ||
b15d97d7 | 49 | static ssize_t module_id_show(struct device *dev, |
8478c35a | 50 | struct device_attribute *attr, char *buf) |
b15d97d7 JH |
51 | { |
52 | struct gb_module *module = to_gb_module(dev); | |
53 | ||
54 | return sprintf(buf, "%u\n", module->module_id); | |
55 | } | |
56 | static DEVICE_ATTR_RO(module_id); | |
57 | ||
58 | static ssize_t num_interfaces_show(struct device *dev, | |
8478c35a | 59 | struct device_attribute *attr, char *buf) |
b15d97d7 JH |
60 | { |
61 | struct gb_module *module = to_gb_module(dev); | |
62 | ||
63 | return sprintf(buf, "%zu\n", module->num_interfaces); | |
64 | } | |
65 | static DEVICE_ATTR_RO(num_interfaces); | |
66 | ||
67 | static struct attribute *module_attrs[] = { | |
36602a29 | 68 | &dev_attr_eject.attr, |
b15d97d7 JH |
69 | &dev_attr_module_id.attr, |
70 | &dev_attr_num_interfaces.attr, | |
71 | NULL, | |
72 | }; | |
73 | ATTRIBUTE_GROUPS(module); | |
74 | ||
75 | static void gb_module_release(struct device *dev) | |
76 | { | |
77 | struct gb_module *module = to_gb_module(dev); | |
78 | ||
5451ea0e AE |
79 | trace_gb_module_release(module); |
80 | ||
b15d97d7 JH |
81 | kfree(module); |
82 | } | |
83 | ||
84 | struct device_type greybus_module_type = { | |
85 | .name = "greybus_module", | |
86 | .release = gb_module_release, | |
87 | }; | |
88 | ||
89 | struct gb_module *gb_module_create(struct gb_host_device *hd, u8 module_id, | |
8478c35a | 90 | size_t num_interfaces) |
b15d97d7 JH |
91 | { |
92 | struct gb_interface *intf; | |
93 | struct gb_module *module; | |
94 | int i; | |
95 | ||
acafe7e3 KC |
96 | module = kzalloc(struct_size(module, interfaces, num_interfaces), |
97 | GFP_KERNEL); | |
b15d97d7 JH |
98 | if (!module) |
99 | return NULL; | |
100 | ||
101 | module->hd = hd; | |
102 | module->module_id = module_id; | |
103 | module->num_interfaces = num_interfaces; | |
104 | ||
105 | module->dev.parent = &hd->dev; | |
106 | module->dev.bus = &greybus_bus_type; | |
107 | module->dev.type = &greybus_module_type; | |
108 | module->dev.groups = module_groups; | |
109 | module->dev.dma_mask = hd->dev.dma_mask; | |
110 | device_initialize(&module->dev); | |
111 | dev_set_name(&module->dev, "%d-%u", hd->bus_id, module_id); | |
112 | ||
5451ea0e AE |
113 | trace_gb_module_create(module); |
114 | ||
b15d97d7 JH |
115 | for (i = 0; i < num_interfaces; ++i) { |
116 | intf = gb_interface_create(module, module_id + i); | |
117 | if (!intf) { | |
118 | dev_err(&module->dev, "failed to create interface %u\n", | |
8478c35a | 119 | module_id + i); |
b15d97d7 JH |
120 | goto err_put_interfaces; |
121 | } | |
122 | module->interfaces[i] = intf; | |
123 | } | |
124 | ||
125 | return module; | |
126 | ||
127 | err_put_interfaces: | |
e866dd8a | 128 | for (--i; i >= 0; --i) |
b15d97d7 JH |
129 | gb_interface_put(module->interfaces[i]); |
130 | ||
131 | put_device(&module->dev); | |
132 | ||
133 | return NULL; | |
134 | } | |
135 | ||
136 | /* | |
137 | * Register and enable an interface after first attempting to activate it. | |
138 | */ | |
139 | static void gb_module_register_interface(struct gb_interface *intf) | |
140 | { | |
141 | struct gb_module *module = intf->module; | |
142 | u8 intf_id = intf->interface_id; | |
143 | int ret; | |
144 | ||
36602a29 JH |
145 | mutex_lock(&intf->mutex); |
146 | ||
3e93cb6a | 147 | ret = gb_interface_activate(intf); |
b15d97d7 | 148 | if (ret) { |
a212b758 | 149 | if (intf->type != GB_INTERFACE_TYPE_DUMMY) { |
6633d80a | 150 | dev_err(&module->dev, |
8478c35a CS |
151 | "failed to activate interface %u: %d\n", |
152 | intf_id, ret); | |
6633d80a | 153 | } |
e16715c1 | 154 | |
b15d97d7 | 155 | gb_interface_add(intf); |
36602a29 | 156 | goto err_unlock; |
b15d97d7 JH |
157 | } |
158 | ||
159 | ret = gb_interface_add(intf); | |
160 | if (ret) | |
161 | goto err_interface_deactivate; | |
162 | ||
163 | ret = gb_interface_enable(intf); | |
164 | if (ret) { | |
165 | dev_err(&module->dev, "failed to enable interface %u: %d\n", | |
8478c35a | 166 | intf_id, ret); |
b15d97d7 JH |
167 | goto err_interface_deactivate; |
168 | } | |
169 | ||
36602a29 JH |
170 | mutex_unlock(&intf->mutex); |
171 | ||
b15d97d7 JH |
172 | return; |
173 | ||
174 | err_interface_deactivate: | |
175 | gb_interface_deactivate(intf); | |
36602a29 JH |
176 | err_unlock: |
177 | mutex_unlock(&intf->mutex); | |
b15d97d7 JH |
178 | } |
179 | ||
180 | static void gb_module_deregister_interface(struct gb_interface *intf) | |
181 | { | |
182 | /* Mark as disconnected to prevent I/O during disable. */ | |
183 | if (intf->module->disconnected) | |
184 | intf->disconnected = true; | |
185 | ||
36602a29 | 186 | mutex_lock(&intf->mutex); |
12169bc9 | 187 | intf->removed = true; |
b15d97d7 JH |
188 | gb_interface_disable(intf); |
189 | gb_interface_deactivate(intf); | |
36602a29 | 190 | mutex_unlock(&intf->mutex); |
b15d97d7 JH |
191 | |
192 | gb_interface_del(intf); | |
193 | } | |
194 | ||
195 | /* Register a module and its interfaces. */ | |
196 | int gb_module_add(struct gb_module *module) | |
197 | { | |
198 | size_t i; | |
199 | int ret; | |
200 | ||
201 | ret = device_add(&module->dev); | |
202 | if (ret) { | |
203 | dev_err(&module->dev, "failed to register module: %d\n", ret); | |
204 | return ret; | |
205 | } | |
206 | ||
5451ea0e AE |
207 | trace_gb_module_add(module); |
208 | ||
b15d97d7 JH |
209 | for (i = 0; i < module->num_interfaces; ++i) |
210 | gb_module_register_interface(module->interfaces[i]); | |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
215 | /* Deregister a module and its interfaces. */ | |
216 | void gb_module_del(struct gb_module *module) | |
217 | { | |
218 | size_t i; | |
219 | ||
220 | for (i = 0; i < module->num_interfaces; ++i) | |
221 | gb_module_deregister_interface(module->interfaces[i]); | |
222 | ||
5451ea0e AE |
223 | trace_gb_module_del(module); |
224 | ||
b15d97d7 JH |
225 | device_del(&module->dev); |
226 | } | |
227 | ||
228 | void gb_module_put(struct gb_module *module) | |
229 | { | |
230 | size_t i; | |
231 | ||
232 | for (i = 0; i < module->num_interfaces; ++i) | |
233 | gb_interface_put(module->interfaces[i]); | |
234 | ||
235 | put_device(&module->dev); | |
236 | } |