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
|
#ifndef __LINUX_FUNCTIONFS_H__
#define __LINUX_FUNCTIONFS_H__ 1
#include <linux/types.h>
#include <linux/ioctl.h>
#include <linux/usb/ch9.h>
enum {
FUNCTIONFS_DESCRIPTORS_MAGIC = 1,
FUNCTIONFS_STRINGS_MAGIC = 2
};
#ifndef __KERNEL__
/* Descriptor of an non-audio endpoint */
struct usb_endpoint_descriptor_no_audio {
__u8 bLength;
__u8 bDescriptorType;
__u8 bEndpointAddress;
__u8 bmAttributes;
__le16 wMaxPacketSize;
__u8 bInterval;
} __attribute__((packed));
/*
* All numbers must be in little endian order.
*/
struct usb_functionfs_descs_head {
__le32 magic;
__le32 length;
__le32 fs_count;
__le32 hs_count;
} __attribute__((packed));
/*
* Descriptors format:
*
* | off | name | type | description |
* |-----+-----------+--------------+--------------------------------------|
* | 0 | magic | LE32 | FUNCTIONFS_{FS,HS}_DESCRIPTORS_MAGIC |
* | 4 | length | LE32 | length of the whole data chunk |
* | 8 | fs_count | LE32 | number of full-speed descriptors |
* | 12 | hs_count | LE32 | number of high-speed descriptors |
* | 16 | fs_descrs | Descriptor[] | list of full-speed descriptors |
* | | hs_descrs | Descriptor[] | list of high-speed descriptors |
*
* descs are just valid USB descriptors and have the following format:
*
* | off | name | type | description |
* |-----+-----------------+------+--------------------------|
* | 0 | bLength | U8 | length of the descriptor |
* | 1 | bDescriptorType | U8 | descriptor type |
* | 2 | payload | | descriptor's payload |
*/
struct usb_functionfs_strings_head {
__le32 magic;
__le32 length;
__le32 str_count;
__le32 lang_count;
} __attribute__((packed));
/*
* Strings format:
*
* | off | name | type | description |
* |-----+------------+-----------------------+----------------------------|
* | 0 | magic | LE32 | FUNCTIONFS_STRINGS_MAGIC |
* | 4 | length | LE32 | length of the data chunk |
* | 8 | str_count | LE32 | number of strings |
* | 12 | lang_count | LE32 | number of languages |
* | 16 | stringtab | StringTab[lang_count] | table of strings per lang |
*
* For each language there is one stringtab entry (ie. there are lang_count
* stringtab entires). Each StringTab has following format:
*
* | off | name | type | description |
* |-----+---------+-------------------+------------------------------------|
* | 0 | lang | LE16 | language code |
* | 2 | strings | String[str_count] | array of strings in given language |
*
* For each string there is one strings entry (ie. there are str_count
* string entries). Each String is a NUL terminated string encoded in
* UTF-8.
*/
#endif
/*
* Events are delivered on the ep0 file descriptor, when the user mode driver
* reads from this file descriptor after writing the descriptors. Don't
* stop polling this descriptor.
*/
enum usb_functionfs_event_type {
FUNCTIONFS_BIND,
FUNCTIONFS_UNBIND,
FUNCTIONFS_ENABLE,
FUNCTIONFS_DISABLE,
FUNCTIONFS_SETUP,
FUNCTIONFS_SUSPEND,
FUNCTIONFS_RESUME
};
/* NOTE: this structure must stay the same size and layout on
* both 32-bit and 64-bit kernels.
*/
struct usb_functionfs_event {
union {
/* SETUP: packet; DATA phase i/o precedes next event
*(setup.bmRequestType & USB_DIR_IN) flags direction */
struct usb_ctrlrequest setup;
} __attribute__((packed)) u;
/* enum usb_functionfs_event_type */
__u8 type;
__u8 _pad[3];
} __attribute__((packed));
/* Endpoint ioctls */
/* The same as in gadgetfs */
/* IN transfers may be reported to the gadget driver as complete
* when the fifo is loaded, before the host reads the data;
* OUT transfers may be reported to the host's "client" driver as
* complete when they're sitting in the FIFO unread.
* THIS returns how many bytes are "unclaimed" in the endpoint fifo
* (needed for precise fault handling, when the hardware allows it)
*/
#define FUNCTIONFS_FIFO_STATUS _IO('g', 1)
/* discards any unclaimed data in the fifo. */
#define FUNCTIONFS_FIFO_FLUSH _IO('g', 2)
/* resets endpoint halt+toggle; used to implement set_interface.
* some hardware (like pxa2xx) can't support this.
*/
#define FUNCTIONFS_CLEAR_HALT _IO('g', 3)
/* Specific for functionfs */
/*
* Returns reverse mapping of an interface. Called on EP0. If there
* is no such interface returns -EDOM. If function is not active
* returns -ENODEV.
*/
#define FUNCTIONFS_INTERFACE_REVMAP _IO('g', 128)
/*
* Returns real bEndpointAddress of an endpoint. If function is not
* active returns -ENODEV.
*/
#define FUNCTIONFS_ENDPOINT_REVMAP _IO('g', 129)
#ifdef __KERNEL__
struct ffs_data;
struct usb_composite_dev;
struct usb_configuration;
static int functionfs_init(void) __attribute__((warn_unused_result));
static void functionfs_cleanup(void);
static int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev *cdev)
__attribute__((warn_unused_result, nonnull));
static void functionfs_unbind(struct ffs_data *ffs)
__attribute__((nonnull));
static int functionfs_bind_config(struct usb_composite_dev *cdev,
struct usb_configuration *c,
struct ffs_data *ffs)
__attribute__((warn_unused_result, nonnull));
static int functionfs_ready_callback(struct ffs_data *ffs)
__attribute__((warn_unused_result, nonnull));
static void functionfs_closed_callback(struct ffs_data *ffs)
__attribute__((nonnull));
static int functionfs_check_dev_callback(const char *dev_name)
__attribute__((warn_unused_result, nonnull));
#endif
#endif
|
