include/uapi/linux/usb/functionfs.h

   1 #ifndef _UAPI__LINUX_FUNCTIONFS_H__
   2 #define _UAPI__LINUX_FUNCTIONFS_H__
   3
   4
   5 #include <linux/types.h>
   6 #include <linux/ioctl.h>
   7
   8 #include <linux/usb/ch9.h>
   9
  10
  11 enum {
  12         FUNCTIONFS_DESCRIPTORS_MAGIC = 1,
  13         FUNCTIONFS_STRINGS_MAGIC = 2,
  14         FUNCTIONFS_DESCRIPTORS_MAGIC_V2 = 3,
  15 };
  16
  17 enum functionfs_flags {
  18         FUNCTIONFS_HAS_FS_DESC = 1,
  19         FUNCTIONFS_HAS_HS_DESC = 2,
  20         FUNCTIONFS_HAS_SS_DESC = 4,
  21 };
  22
  23 #ifndef __KERNEL__
  24
  25 /* Descriptor of an non-audio endpoint */
  26 struct usb_endpoint_descriptor_no_audio {
  27         __u8  bLength;
  28         __u8  bDescriptorType;
  29
  30         __u8  bEndpointAddress;
  31         __u8  bmAttributes;
  32         __le16 wMaxPacketSize;
  33         __u8  bInterval;
  34 } __attribute__((packed));
  35
  36
  37 /*
  38  * Descriptors format:
  39  *
  40  * | off | name      | type         | description                          |
  41  * |-----+-----------+--------------+--------------------------------------|
  42  * |   0 | magic     | LE32         | FUNCTIONFS_DESCRIPTORS_MAGIC_V2      |
  43  * |   4 | length    | LE32         | length of the whole data chunk       |
  44  * |   8 | flags     | LE32         | combination of functionfs_flags      |
  45  * |     | fs_count  | LE32         | number of full-speed descriptors     |
  46  * |     | hs_count  | LE32         | number of high-speed descriptors     |
  47  * |     | ss_count  | LE32         | number of super-speed descriptors    |
  48  * |     | fs_descrs | Descriptor[] | list of full-speed descriptors       |
  49  * |     | hs_descrs | Descriptor[] | list of high-speed descriptors       |
  50  * |     | ss_descrs | Descriptor[] | list of super-speed descriptors      |
  51  *
  52  * Depending on which flags are set, various fields may be missing in the
  53  * structure.  Any flags that are not recognised cause the whole block to be
  54  * rejected with -ENOSYS.
  55  *
  56  * Legacy descriptors format:
  57  *
  58  * | off | name      | type         | description                          |
  59  * |-----+-----------+--------------+--------------------------------------|
  60  * |   0 | magic     | LE32         | FUNCTIONFS_DESCRIPTORS_MAGIC         |
  61  * |   4 | length    | LE32         | length of the whole data chunk       |
  62  * |   8 | fs_count  | LE32         | number of full-speed descriptors     |
  63  * |  12 | hs_count  | LE32         | number of high-speed descriptors     |
  64  * |  16 | fs_descrs | Descriptor[] | list of full-speed descriptors       |
  65  * |     | hs_descrs | Descriptor[] | list of high-speed descriptors       |
  66  *
  67  * All numbers must be in little endian order.
  68  *
  69  * Descriptor[] is an array of valid USB descriptors which have the following
  70  * format:
  71  *
  72  * | off | name            | type | description              |
  73  * |-----+-----------------+------+--------------------------|
  74  * |   0 | bLength         | U8   | length of the descriptor |
  75  * |   1 | bDescriptorType | U8   | descriptor type          |
  76  * |   2 | payload         |      | descriptor's payload     |
  77  */
  78
  79 struct usb_functionfs_strings_head {
  80         __le32 magic;
  81         __le32 length;
  82         __le32 str_count;
  83         __le32 lang_count;
  84 } __attribute__((packed));
  85
  86 /*
  87  * Strings format:
  88  *
  89  * | off | name       | type                  | description                |
  90  * |-----+------------+-----------------------+----------------------------|
  91  * |   0 | magic      | LE32                  | FUNCTIONFS_STRINGS_MAGIC   |
  92  * |   4 | length     | LE32                  | length of the data chunk   |
  93  * |   8 | str_count  | LE32                  | number of strings          |
  94  * |  12 | lang_count | LE32                  | number of languages        |
  95  * |  16 | stringtab  | StringTab[lang_count] | table of strings per lang  |
  96  *
  97  * For each language there is one stringtab entry (ie. there are lang_count
  98  * stringtab entires).  Each StringTab has following format:
  99  *
 100  * | off | name    | type              | description                        |
 101  * |-----+---------+-------------------+------------------------------------|
 102  * |   0 | lang    | LE16              | language code                      |
 103  * |   2 | strings | String[str_count] | array of strings in given language |
 104  *
 105  * For each string there is one strings entry (ie. there are str_count
 106  * string entries).  Each String is a NUL terminated string encoded in
 107  * UTF-8.
 108  */
 109
 110 #endif
 111
 112
 113 /*
 114  * Events are delivered on the ep0 file descriptor, when the user mode driver
 115  * reads from this file descriptor after writing the descriptors.  Don't
 116  * stop polling this descriptor.
 117  */
 118
 119 enum usb_functionfs_event_type {
 120         FUNCTIONFS_BIND,
 121         FUNCTIONFS_UNBIND,
 122
 123         FUNCTIONFS_ENABLE,
 124         FUNCTIONFS_DISABLE,
 125
 126         FUNCTIONFS_SETUP,
 127
 128         FUNCTIONFS_SUSPEND,
 129         FUNCTIONFS_RESUME
 130 };
 131
 132 /* NOTE:  this structure must stay the same size and layout on
 133  * both 32-bit and 64-bit kernels.
 134  */
 135 struct usb_functionfs_event {
 136         union {
 137                 /* SETUP: packet; DATA phase i/o precedes next event
 138                  *(setup.bmRequestType & USB_DIR_IN) flags direction */
 139                 struct usb_ctrlrequest  setup;
 140         } __attribute__((packed)) u;
 141
 142         /* enum usb_functionfs_event_type */
 143         __u8                            type;
 144         __u8                            _pad[3];
 145 } __attribute__((packed));
 146
 147
 148 /* Endpoint ioctls */
 149 /* The same as in gadgetfs */
 150
 151 /* IN transfers may be reported to the gadget driver as complete
 152  *      when the fifo is loaded, before the host reads the data;
 153  * OUT transfers may be reported to the host's "client" driver as
 154  *      complete when they're sitting in the FIFO unread.
 155  * THIS returns how many bytes are "unclaimed" in the endpoint fifo
 156  * (needed for precise fault handling, when the hardware allows it)
 157  */
 158 #define FUNCTIONFS_FIFO_STATUS  _IO('g', 1)
 159
 160 /* discards any unclaimed data in the fifo. */
 161 #define FUNCTIONFS_FIFO_FLUSH   _IO('g', 2)
 162
 163 /* resets endpoint halt+toggle; used to implement set_interface.
 164  * some hardware (like pxa2xx) can't support this.
 165  */
 166 #define FUNCTIONFS_CLEAR_HALT   _IO('g', 3)
 167
 168 /* Specific for functionfs */
 169
 170 /*
 171  * Returns reverse mapping of an interface.  Called on EP0.  If there
 172  * is no such interface returns -EDOM.  If function is not active
 173  * returns -ENODEV.
 174  */
 175 #define FUNCTIONFS_INTERFACE_REVMAP     _IO('g', 128)
 176
 177 /*
 178  * Returns real bEndpointAddress of an endpoint.  If function is not
 179  * active returns -ENODEV.
 180  */
 181 #define FUNCTIONFS_ENDPOINT_REVMAP      _IO('g', 129)
 182
 183
 184
 185 #endif /* _UAPI__LINUX_FUNCTIONFS_H__ */