1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
// SPDX-License-Identifier: GPL-2.0
/*
* Greybus Module code
*
* Copyright 2016 Google Inc.
* Copyright 2016 Linaro Ltd.
*/
#include "greybus.h"
#include "greybus_trace.h"
static ssize_t eject_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct gb_module *module = to_gb_module(dev);
struct gb_interface *intf;
size_t i;
long val;
int ret;
ret = kstrtol(buf, 0, &val);
if (ret)
return ret;
if (!val)
return len;
for (i = 0; i < module->num_interfaces; ++i) {
intf = module->interfaces[i];
mutex_lock(&intf->mutex);
/* Set flag to prevent concurrent activation. */
intf->ejected = true;
gb_interface_disable(intf);
gb_interface_deactivate(intf);
mutex_unlock(&intf->mutex);
}
/* Tell the SVC to eject the primary interface. */
ret = gb_svc_intf_eject(module->hd->svc, module->module_id);
if (ret)
return ret;
return len;
}
static DEVICE_ATTR_WO(eject);
static ssize_t module_id_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gb_module *module = to_gb_module(dev);
return sprintf(buf, "%u\n", module->module_id);
}
static DEVICE_ATTR_RO(module_id);
static ssize_t num_interfaces_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gb_module *module = to_gb_module(dev);
return sprintf(buf, "%zu\n", module->num_interfaces);
}
static DEVICE_ATTR_RO(num_interfaces);
static struct attribute *module_attrs[] = {
&dev_attr_eject.attr,
&dev_attr_module_id.attr,
&dev_attr_num_interfaces.attr,
NULL,
};
ATTRIBUTE_GROUPS(module);
static void gb_module_release(struct device *dev)
{
struct gb_module *module = to_gb_module(dev);
trace_gb_module_release(module);
kfree(module);
}
struct device_type greybus_module_type = {
.name = "greybus_module",
.release = gb_module_release,
};
struct gb_module *gb_module_create(struct gb_host_device *hd, u8 module_id,
size_t num_interfaces)
{
struct gb_interface *intf;
struct gb_module *module;
int i;
module = kzalloc(struct_size(module, interfaces, num_interfaces),
GFP_KERNEL);
if (!module)
return NULL;
module->hd = hd;
module->module_id = module_id;
module->num_interfaces = num_interfaces;
module->dev.parent = &hd->dev;
module->dev.bus = &greybus_bus_type;
module->dev.type = &greybus_module_type;
module->dev.groups = module_groups;
module->dev.dma_mask = hd->dev.dma_mask;
device_initialize(&module->dev);
dev_set_name(&module->dev, "%d-%u", hd->bus_id, module_id);
trace_gb_module_create(module);
for (i = 0; i < num_interfaces; ++i) {
intf = gb_interface_create(module, module_id + i);
if (!intf) {
dev_err(&module->dev, "failed to create interface %u\n",
module_id + i);
goto err_put_interfaces;
}
module->interfaces[i] = intf;
}
return module;
err_put_interfaces:
for (--i; i >= 0; --i)
gb_interface_put(module->interfaces[i]);
put_device(&module->dev);
return NULL;
}
/*
* Register and enable an interface after first attempting to activate it.
*/
static void gb_module_register_interface(struct gb_interface *intf)
{
struct gb_module *module = intf->module;
u8 intf_id = intf->interface_id;
int ret;
mutex_lock(&intf->mutex);
ret = gb_interface_activate(intf);
if (ret) {
if (intf->type != GB_INTERFACE_TYPE_DUMMY) {
dev_err(&module->dev,
"failed to activate interface %u: %d\n",
intf_id, ret);
}
gb_interface_add(intf);
goto err_unlock;
}
ret = gb_interface_add(intf);
if (ret)
goto err_interface_deactivate;
ret = gb_interface_enable(intf);
if (ret) {
dev_err(&module->dev, "failed to enable interface %u: %d\n",
intf_id, ret);
goto err_interface_deactivate;
}
mutex_unlock(&intf->mutex);
return;
err_interface_deactivate:
gb_interface_deactivate(intf);
err_unlock:
mutex_unlock(&intf->mutex);
}
static void gb_module_deregister_interface(struct gb_interface *intf)
{
/* Mark as disconnected to prevent I/O during disable. */
if (intf->module->disconnected)
intf->disconnected = true;
mutex_lock(&intf->mutex);
intf->removed = true;
gb_interface_disable(intf);
gb_interface_deactivate(intf);
mutex_unlock(&intf->mutex);
gb_interface_del(intf);
}
/* Register a module and its interfaces. */
int gb_module_add(struct gb_module *module)
{
size_t i;
int ret;
ret = device_add(&module->dev);
if (ret) {
dev_err(&module->dev, "failed to register module: %d\n", ret);
return ret;
}
trace_gb_module_add(module);
for (i = 0; i < module->num_interfaces; ++i)
gb_module_register_interface(module->interfaces[i]);
return 0;
}
/* Deregister a module and its interfaces. */
void gb_module_del(struct gb_module *module)
{
size_t i;
for (i = 0; i < module->num_interfaces; ++i)
gb_module_deregister_interface(module->interfaces[i]);
trace_gb_module_del(module);
device_del(&module->dev);
}
void gb_module_put(struct gb_module *module)
{
size_t i;
for (i = 0; i < module->num_interfaces; ++i)
gb_interface_put(module->interfaces[i]);
put_device(&module->dev);
}
|
